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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Linux INET6 implementation | |
4 | * FIB front-end. | |
5 | * | |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
8 | */ |
9 | ||
10 | /* Changes: | |
11 | * | |
12 | * YOSHIFUJI Hideaki @USAGI | |
13 | * reworked default router selection. | |
14 | * - respect outgoing interface | |
15 | * - select from (probably) reachable routers (i.e. | |
16 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
17 | * - always select the same router if it is (probably) | |
18 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
19 | * Ville Nuorvala |
20 | * Fixed routing subtrees. | |
1da177e4 LT |
21 | */ |
22 | ||
f3213831 JP |
23 | #define pr_fmt(fmt) "IPv6: " fmt |
24 | ||
4fc268d2 | 25 | #include <linux/capability.h> |
1da177e4 | 26 | #include <linux/errno.h> |
bc3b2d7f | 27 | #include <linux/export.h> |
1da177e4 LT |
28 | #include <linux/types.h> |
29 | #include <linux/times.h> | |
30 | #include <linux/socket.h> | |
31 | #include <linux/sockios.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/route.h> | |
34 | #include <linux/netdevice.h> | |
35 | #include <linux/in6.h> | |
7bc570c8 | 36 | #include <linux/mroute6.h> |
1da177e4 | 37 | #include <linux/init.h> |
1da177e4 | 38 | #include <linux/if_arp.h> |
1da177e4 LT |
39 | #include <linux/proc_fs.h> |
40 | #include <linux/seq_file.h> | |
5b7c931d | 41 | #include <linux/nsproxy.h> |
5a0e3ad6 | 42 | #include <linux/slab.h> |
35732d01 | 43 | #include <linux/jhash.h> |
4785305c | 44 | #include <linux/siphash.h> |
457c4cbc | 45 | #include <net/net_namespace.h> |
1da177e4 LT |
46 | #include <net/snmp.h> |
47 | #include <net/ipv6.h> | |
48 | #include <net/ip6_fib.h> | |
49 | #include <net/ip6_route.h> | |
50 | #include <net/ndisc.h> | |
51 | #include <net/addrconf.h> | |
52 | #include <net/tcp.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/dst.h> | |
904af04d | 55 | #include <net/dst_metadata.h> |
1da177e4 | 56 | #include <net/xfrm.h> |
8d71740c | 57 | #include <net/netevent.h> |
21713ebc | 58 | #include <net/netlink.h> |
3c618c1d | 59 | #include <net/rtnh.h> |
19e42e45 | 60 | #include <net/lwtunnel.h> |
904af04d | 61 | #include <net/ip_tunnels.h> |
ca254490 | 62 | #include <net/l3mdev.h> |
eacb9384 | 63 | #include <net/ip.h> |
7c0f6ba6 | 64 | #include <linux/uaccess.h> |
951cf368 | 65 | #include <linux/btf_ids.h> |
1da177e4 LT |
66 | |
67 | #ifdef CONFIG_SYSCTL | |
68 | #include <linux/sysctl.h> | |
69 | #endif | |
70 | ||
30d444d3 DA |
71 | static int ip6_rt_type_to_error(u8 fib6_type); |
72 | ||
73 | #define CREATE_TRACE_POINTS | |
74 | #include <trace/events/fib6.h> | |
75 | EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup); | |
76 | #undef CREATE_TRACE_POINTS | |
77 | ||
afc154e9 | 78 | enum rt6_nud_state { |
7e980569 JB |
79 | RT6_NUD_FAIL_HARD = -3, |
80 | RT6_NUD_FAIL_PROBE = -2, | |
81 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
82 | RT6_NUD_SUCCEED = 1 |
83 | }; | |
84 | ||
bbd807df BV |
85 | INDIRECT_CALLABLE_SCOPE |
86 | struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 87 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
f67fbeae BV |
88 | INDIRECT_CALLABLE_SCOPE |
89 | unsigned int ip6_mtu(const struct dst_entry *dst); | |
1da177e4 LT |
90 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
91 | static void ip6_dst_destroy(struct dst_entry *); | |
92 | static void ip6_dst_ifdown(struct dst_entry *, | |
93 | struct net_device *dev, int how); | |
569d3645 | 94 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
95 | |
96 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 97 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 98 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 99 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 100 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 | 101 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
102 | struct sk_buff *skb, u32 mtu, |
103 | bool confirm_neigh); | |
6700c270 DM |
104 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, |
105 | struct sk_buff *skb); | |
702cea56 DA |
106 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
107 | int strict); | |
a1b7a1f0 | 108 | static size_t rt6_nlmsg_size(struct fib6_info *f6i); |
d4ead6b3 | 109 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 110 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 111 | struct in6_addr *dest, struct in6_addr *src, |
16a16cd3 DA |
112 | int iif, int type, u32 portid, u32 seq, |
113 | unsigned int flags); | |
7e4b5128 | 114 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
115 | const struct in6_addr *daddr, |
116 | const struct in6_addr *saddr); | |
1da177e4 | 117 | |
70ceb4f5 | 118 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 119 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 120 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
121 | const struct in6_addr *gwaddr, |
122 | struct net_device *dev, | |
95c96174 | 123 | unsigned int pref); |
8d1c802b | 124 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 125 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
126 | const struct in6_addr *gwaddr, |
127 | struct net_device *dev); | |
70ceb4f5 YH |
128 | #endif |
129 | ||
8d0b94af MKL |
130 | struct uncached_list { |
131 | spinlock_t lock; | |
132 | struct list_head head; | |
133 | }; | |
134 | ||
135 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
136 | ||
510c321b | 137 | void rt6_uncached_list_add(struct rt6_info *rt) |
8d0b94af MKL |
138 | { |
139 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
140 | ||
8d0b94af MKL |
141 | rt->rt6i_uncached_list = ul; |
142 | ||
143 | spin_lock_bh(&ul->lock); | |
144 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
145 | spin_unlock_bh(&ul->lock); | |
146 | } | |
147 | ||
510c321b | 148 | void rt6_uncached_list_del(struct rt6_info *rt) |
8d0b94af MKL |
149 | { |
150 | if (!list_empty(&rt->rt6i_uncached)) { | |
151 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
81eb8447 | 152 | struct net *net = dev_net(rt->dst.dev); |
8d0b94af MKL |
153 | |
154 | spin_lock_bh(&ul->lock); | |
155 | list_del(&rt->rt6i_uncached); | |
81eb8447 | 156 | atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache); |
8d0b94af MKL |
157 | spin_unlock_bh(&ul->lock); |
158 | } | |
159 | } | |
160 | ||
161 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
162 | { | |
163 | struct net_device *loopback_dev = net->loopback_dev; | |
164 | int cpu; | |
165 | ||
e332bc67 EB |
166 | if (dev == loopback_dev) |
167 | return; | |
168 | ||
8d0b94af MKL |
169 | for_each_possible_cpu(cpu) { |
170 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
171 | struct rt6_info *rt; | |
172 | ||
173 | spin_lock_bh(&ul->lock); | |
174 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
175 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
176 | struct net_device *rt_dev = rt->dst.dev; | |
177 | ||
e332bc67 | 178 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
179 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
180 | in6_dev_put(rt_idev); | |
181 | } | |
182 | ||
e332bc67 | 183 | if (rt_dev == dev) { |
8d7017fd | 184 | rt->dst.dev = blackhole_netdev; |
8d0b94af MKL |
185 | dev_hold(rt->dst.dev); |
186 | dev_put(rt_dev); | |
187 | } | |
188 | } | |
189 | spin_unlock_bh(&ul->lock); | |
190 | } | |
191 | } | |
192 | ||
f8a1b43b | 193 | static inline const void *choose_neigh_daddr(const struct in6_addr *p, |
f894cbf8 DM |
194 | struct sk_buff *skb, |
195 | const void *daddr) | |
39232973 | 196 | { |
a7563f34 | 197 | if (!ipv6_addr_any(p)) |
39232973 | 198 | return (const void *) p; |
f894cbf8 DM |
199 | else if (skb) |
200 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
201 | return daddr; |
202 | } | |
203 | ||
f8a1b43b DA |
204 | struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw, |
205 | struct net_device *dev, | |
206 | struct sk_buff *skb, | |
207 | const void *daddr) | |
d3aaeb38 | 208 | { |
39232973 DM |
209 | struct neighbour *n; |
210 | ||
f8a1b43b DA |
211 | daddr = choose_neigh_daddr(gw, skb, daddr); |
212 | n = __ipv6_neigh_lookup(dev, daddr); | |
f83c7790 DM |
213 | if (n) |
214 | return n; | |
7adf3246 SB |
215 | |
216 | n = neigh_create(&nd_tbl, daddr, dev); | |
217 | return IS_ERR(n) ? NULL : n; | |
f8a1b43b DA |
218 | } |
219 | ||
220 | static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst, | |
221 | struct sk_buff *skb, | |
222 | const void *daddr) | |
223 | { | |
224 | const struct rt6_info *rt = container_of(dst, struct rt6_info, dst); | |
225 | ||
2c6b55f4 ND |
226 | return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any), |
227 | dst->dev, skb, daddr); | |
f83c7790 DM |
228 | } |
229 | ||
63fca65d JA |
230 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
231 | { | |
232 | struct net_device *dev = dst->dev; | |
233 | struct rt6_info *rt = (struct rt6_info *)dst; | |
234 | ||
cbfd6891 | 235 | daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr); |
63fca65d JA |
236 | if (!daddr) |
237 | return; | |
238 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
239 | return; | |
240 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
241 | return; | |
242 | __ipv6_confirm_neigh(dev, daddr); | |
243 | } | |
244 | ||
9a7ec3a9 | 245 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 246 | .family = AF_INET6, |
1da177e4 LT |
247 | .gc = ip6_dst_gc, |
248 | .gc_thresh = 1024, | |
249 | .check = ip6_dst_check, | |
0dbaee3b | 250 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 251 | .mtu = ip6_mtu, |
d4ead6b3 | 252 | .cow_metrics = dst_cow_metrics_generic, |
1da177e4 LT |
253 | .destroy = ip6_dst_destroy, |
254 | .ifdown = ip6_dst_ifdown, | |
255 | .negative_advice = ip6_negative_advice, | |
256 | .link_failure = ip6_link_failure, | |
257 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 258 | .redirect = rt6_do_redirect, |
9f8955cc | 259 | .local_out = __ip6_local_out, |
f8a1b43b | 260 | .neigh_lookup = ip6_dst_neigh_lookup, |
63fca65d | 261 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
262 | }; |
263 | ||
14e50e57 | 264 | static struct dst_ops ip6_dst_blackhole_ops = { |
c4c877b2 DB |
265 | .family = AF_INET6, |
266 | .default_advmss = ip6_default_advmss, | |
267 | .neigh_lookup = ip6_dst_neigh_lookup, | |
268 | .check = ip6_dst_check, | |
269 | .destroy = ip6_dst_destroy, | |
270 | .cow_metrics = dst_cow_metrics_generic, | |
271 | .update_pmtu = dst_blackhole_update_pmtu, | |
272 | .redirect = dst_blackhole_redirect, | |
273 | .mtu = dst_blackhole_mtu, | |
14e50e57 DM |
274 | }; |
275 | ||
62fa8a84 | 276 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 277 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
278 | }; |
279 | ||
8d1c802b | 280 | static const struct fib6_info fib6_null_entry_template = { |
93c2fb25 DA |
281 | .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP), |
282 | .fib6_protocol = RTPROT_KERNEL, | |
283 | .fib6_metric = ~(u32)0, | |
f05713e0 | 284 | .fib6_ref = REFCOUNT_INIT(1), |
421842ed DA |
285 | .fib6_type = RTN_UNREACHABLE, |
286 | .fib6_metrics = (struct dst_metrics *)&dst_default_metrics, | |
287 | }; | |
288 | ||
fb0af4c7 | 289 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
290 | .dst = { |
291 | .__refcnt = ATOMIC_INIT(1), | |
292 | .__use = 1, | |
2c20cbd7 | 293 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 294 | .error = -ENETUNREACH, |
d8d1f30b CG |
295 | .input = ip6_pkt_discard, |
296 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
297 | }, |
298 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
1da177e4 LT |
299 | }; |
300 | ||
101367c2 TG |
301 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
302 | ||
fb0af4c7 | 303 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
304 | .dst = { |
305 | .__refcnt = ATOMIC_INIT(1), | |
306 | .__use = 1, | |
2c20cbd7 | 307 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 308 | .error = -EACCES, |
d8d1f30b CG |
309 | .input = ip6_pkt_prohibit, |
310 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
311 | }, |
312 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
313 | }; |
314 | ||
fb0af4c7 | 315 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
316 | .dst = { |
317 | .__refcnt = ATOMIC_INIT(1), | |
318 | .__use = 1, | |
2c20cbd7 | 319 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 320 | .error = -EINVAL, |
d8d1f30b | 321 | .input = dst_discard, |
ede2059d | 322 | .output = dst_discard_out, |
101367c2 TG |
323 | }, |
324 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
325 | }; |
326 | ||
327 | #endif | |
328 | ||
ebfa45f0 MKL |
329 | static void rt6_info_init(struct rt6_info *rt) |
330 | { | |
331 | struct dst_entry *dst = &rt->dst; | |
332 | ||
333 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
ebfa45f0 MKL |
334 | INIT_LIST_HEAD(&rt->rt6i_uncached); |
335 | } | |
336 | ||
1da177e4 | 337 | /* allocate dst with ip6_dst_ops */ |
93531c67 DA |
338 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
339 | int flags) | |
1da177e4 | 340 | { |
97bab73f | 341 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
b2a9c0ed | 342 | 1, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 343 | |
81eb8447 | 344 | if (rt) { |
ebfa45f0 | 345 | rt6_info_init(rt); |
81eb8447 WW |
346 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
347 | } | |
8104891b | 348 | |
cf911662 | 349 | return rt; |
1da177e4 | 350 | } |
9ab179d8 | 351 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 352 | |
1da177e4 LT |
353 | static void ip6_dst_destroy(struct dst_entry *dst) |
354 | { | |
355 | struct rt6_info *rt = (struct rt6_info *)dst; | |
a68886a6 | 356 | struct fib6_info *from; |
8d0b94af | 357 | struct inet6_dev *idev; |
1da177e4 | 358 | |
1620a336 | 359 | ip_dst_metrics_put(dst); |
8d0b94af MKL |
360 | rt6_uncached_list_del(rt); |
361 | ||
362 | idev = rt->rt6i_idev; | |
38308473 | 363 | if (idev) { |
1da177e4 LT |
364 | rt->rt6i_idev = NULL; |
365 | in6_dev_put(idev); | |
1ab1457c | 366 | } |
1716a961 | 367 | |
0e233874 | 368 | from = xchg((__force struct fib6_info **)&rt->from, NULL); |
93531c67 | 369 | fib6_info_release(from); |
b3419363 DM |
370 | } |
371 | ||
1da177e4 LT |
372 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
373 | int how) | |
374 | { | |
375 | struct rt6_info *rt = (struct rt6_info *)dst; | |
376 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 377 | struct net_device *loopback_dev = |
c346dca1 | 378 | dev_net(dev)->loopback_dev; |
1da177e4 | 379 | |
e5645f51 WW |
380 | if (idev && idev->dev != loopback_dev) { |
381 | struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev); | |
382 | if (loopback_idev) { | |
383 | rt->rt6i_idev = loopback_idev; | |
384 | in6_dev_put(idev); | |
97cac082 | 385 | } |
1da177e4 LT |
386 | } |
387 | } | |
388 | ||
5973fb1e MKL |
389 | static bool __rt6_check_expired(const struct rt6_info *rt) |
390 | { | |
391 | if (rt->rt6i_flags & RTF_EXPIRES) | |
392 | return time_after(jiffies, rt->dst.expires); | |
393 | else | |
394 | return false; | |
395 | } | |
396 | ||
a50feda5 | 397 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 398 | { |
a68886a6 DA |
399 | struct fib6_info *from; |
400 | ||
401 | from = rcu_dereference(rt->from); | |
402 | ||
1716a961 G |
403 | if (rt->rt6i_flags & RTF_EXPIRES) { |
404 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 405 | return true; |
a68886a6 | 406 | } else if (from) { |
1e2ea8ad | 407 | return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK || |
a68886a6 | 408 | fib6_check_expired(from); |
1716a961 | 409 | } |
a50feda5 | 410 | return false; |
1da177e4 LT |
411 | } |
412 | ||
b1d40991 DA |
413 | void fib6_select_path(const struct net *net, struct fib6_result *res, |
414 | struct flowi6 *fl6, int oif, bool have_oif_match, | |
415 | const struct sk_buff *skb, int strict) | |
51ebd318 | 416 | { |
8d1c802b | 417 | struct fib6_info *sibling, *next_sibling; |
b1d40991 DA |
418 | struct fib6_info *match = res->f6i; |
419 | ||
34fe5a1c | 420 | if (!match->nh && (!match->fib6_nsiblings || have_oif_match)) |
b1d40991 | 421 | goto out; |
51ebd318 | 422 | |
34fe5a1c DA |
423 | if (match->nh && have_oif_match && res->nh) |
424 | return; | |
425 | ||
b673d6cc JS |
426 | /* We might have already computed the hash for ICMPv6 errors. In such |
427 | * case it will always be non-zero. Otherwise now is the time to do it. | |
428 | */ | |
f88d8ea6 DA |
429 | if (!fl6->mp_hash && |
430 | (!match->nh || nexthop_is_multipath(match->nh))) | |
b4bac172 | 431 | fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL); |
b673d6cc | 432 | |
f88d8ea6 DA |
433 | if (unlikely(match->nh)) { |
434 | nexthop_path_fib6_result(res, fl6->mp_hash); | |
435 | return; | |
436 | } | |
437 | ||
1cf844c7 | 438 | if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound)) |
b1d40991 | 439 | goto out; |
3d709f69 | 440 | |
93c2fb25 DA |
441 | list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings, |
442 | fib6_siblings) { | |
1cf844c7 | 443 | const struct fib6_nh *nh = sibling->fib6_nh; |
5e670d84 DA |
444 | int nh_upper_bound; |
445 | ||
702cea56 | 446 | nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound); |
5e670d84 | 447 | if (fl6->mp_hash > nh_upper_bound) |
3d709f69 | 448 | continue; |
702cea56 | 449 | if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0) |
3d709f69 IS |
450 | break; |
451 | match = sibling; | |
452 | break; | |
453 | } | |
454 | ||
b1d40991 DA |
455 | out: |
456 | res->f6i = match; | |
1cf844c7 | 457 | res->nh = match->fib6_nh; |
51ebd318 ND |
458 | } |
459 | ||
1da177e4 | 460 | /* |
66f5d6ce | 461 | * Route lookup. rcu_read_lock() should be held. |
1da177e4 LT |
462 | */ |
463 | ||
0c59d006 DA |
464 | static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh, |
465 | const struct in6_addr *saddr, int oif, int flags) | |
466 | { | |
467 | const struct net_device *dev; | |
468 | ||
469 | if (nh->fib_nh_flags & RTNH_F_DEAD) | |
470 | return false; | |
471 | ||
472 | dev = nh->fib_nh_dev; | |
473 | if (oif) { | |
474 | if (dev->ifindex == oif) | |
475 | return true; | |
476 | } else { | |
477 | if (ipv6_chk_addr(net, saddr, dev, | |
478 | flags & RT6_LOOKUP_F_IFACE)) | |
479 | return true; | |
480 | } | |
481 | ||
482 | return false; | |
483 | } | |
484 | ||
962b6803 DA |
485 | struct fib6_nh_dm_arg { |
486 | struct net *net; | |
487 | const struct in6_addr *saddr; | |
488 | int oif; | |
489 | int flags; | |
490 | struct fib6_nh *nh; | |
491 | }; | |
492 | ||
493 | static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg) | |
494 | { | |
495 | struct fib6_nh_dm_arg *arg = _arg; | |
496 | ||
497 | arg->nh = nh; | |
498 | return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif, | |
499 | arg->flags); | |
500 | } | |
501 | ||
502 | /* returns fib6_nh from nexthop or NULL */ | |
503 | static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh, | |
504 | struct fib6_result *res, | |
505 | const struct in6_addr *saddr, | |
506 | int oif, int flags) | |
507 | { | |
508 | struct fib6_nh_dm_arg arg = { | |
509 | .net = net, | |
510 | .saddr = saddr, | |
511 | .oif = oif, | |
512 | .flags = flags, | |
513 | }; | |
514 | ||
515 | if (nexthop_is_blackhole(nh)) | |
516 | return NULL; | |
517 | ||
518 | if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg)) | |
519 | return arg.nh; | |
520 | ||
521 | return NULL; | |
522 | } | |
523 | ||
75ef7389 DA |
524 | static void rt6_device_match(struct net *net, struct fib6_result *res, |
525 | const struct in6_addr *saddr, int oif, int flags) | |
1da177e4 | 526 | { |
75ef7389 DA |
527 | struct fib6_info *f6i = res->f6i; |
528 | struct fib6_info *spf6i; | |
529 | struct fib6_nh *nh; | |
1da177e4 | 530 | |
75ef7389 | 531 | if (!oif && ipv6_addr_any(saddr)) { |
f88d8ea6 DA |
532 | if (unlikely(f6i->nh)) { |
533 | nh = nexthop_fib6_nh(f6i->nh); | |
534 | if (nexthop_is_blackhole(f6i->nh)) | |
535 | goto out_blackhole; | |
536 | } else { | |
537 | nh = f6i->fib6_nh; | |
538 | } | |
7d21fec9 DA |
539 | if (!(nh->fib_nh_flags & RTNH_F_DEAD)) |
540 | goto out; | |
75ef7389 | 541 | } |
dd3abc4e | 542 | |
75ef7389 | 543 | for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) { |
962b6803 DA |
544 | bool matched = false; |
545 | ||
546 | if (unlikely(spf6i->nh)) { | |
547 | nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr, | |
548 | oif, flags); | |
549 | if (nh) | |
550 | matched = true; | |
551 | } else { | |
552 | nh = spf6i->fib6_nh; | |
553 | if (__rt6_device_match(net, nh, saddr, oif, flags)) | |
554 | matched = true; | |
555 | } | |
556 | if (matched) { | |
75ef7389 | 557 | res->f6i = spf6i; |
7d21fec9 | 558 | goto out; |
75ef7389 | 559 | } |
dd3abc4e | 560 | } |
1da177e4 | 561 | |
75ef7389 DA |
562 | if (oif && flags & RT6_LOOKUP_F_IFACE) { |
563 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 564 | nh = res->f6i->fib6_nh; |
7d21fec9 | 565 | goto out; |
75ef7389 | 566 | } |
8067bb8c | 567 | |
f88d8ea6 DA |
568 | if (unlikely(f6i->nh)) { |
569 | nh = nexthop_fib6_nh(f6i->nh); | |
570 | if (nexthop_is_blackhole(f6i->nh)) | |
571 | goto out_blackhole; | |
572 | } else { | |
573 | nh = f6i->fib6_nh; | |
574 | } | |
575 | ||
7d21fec9 | 576 | if (nh->fib_nh_flags & RTNH_F_DEAD) { |
75ef7389 | 577 | res->f6i = net->ipv6.fib6_null_entry; |
1cf844c7 | 578 | nh = res->f6i->fib6_nh; |
75ef7389 | 579 | } |
7d21fec9 DA |
580 | out: |
581 | res->nh = nh; | |
582 | res->fib6_type = res->f6i->fib6_type; | |
583 | res->fib6_flags = res->f6i->fib6_flags; | |
f88d8ea6 DA |
584 | return; |
585 | ||
586 | out_blackhole: | |
587 | res->fib6_flags |= RTF_REJECT; | |
588 | res->fib6_type = RTN_BLACKHOLE; | |
589 | res->nh = nh; | |
1da177e4 LT |
590 | } |
591 | ||
27097255 | 592 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
593 | struct __rt6_probe_work { |
594 | struct work_struct work; | |
595 | struct in6_addr target; | |
596 | struct net_device *dev; | |
597 | }; | |
598 | ||
599 | static void rt6_probe_deferred(struct work_struct *w) | |
600 | { | |
601 | struct in6_addr mcaddr; | |
602 | struct __rt6_probe_work *work = | |
603 | container_of(w, struct __rt6_probe_work, work); | |
604 | ||
605 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 606 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 607 | dev_put(work->dev); |
662f5533 | 608 | kfree(work); |
c2f17e82 HFS |
609 | } |
610 | ||
cc3a86c8 | 611 | static void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 612 | { |
f547fac6 | 613 | struct __rt6_probe_work *work = NULL; |
5e670d84 | 614 | const struct in6_addr *nh_gw; |
1bef4c22 | 615 | unsigned long last_probe; |
f2c31e32 | 616 | struct neighbour *neigh; |
5e670d84 | 617 | struct net_device *dev; |
f547fac6 | 618 | struct inet6_dev *idev; |
5e670d84 | 619 | |
27097255 YH |
620 | /* |
621 | * Okay, this does not seem to be appropriate | |
622 | * for now, however, we need to check if it | |
623 | * is really so; aka Router Reachability Probing. | |
624 | * | |
625 | * Router Reachability Probe MUST be rate-limited | |
626 | * to no more than one per minute. | |
627 | */ | |
004b3942 | 628 | if (!fib6_nh->fib_nh_gw_family) |
7ff74a59 | 629 | return; |
5e670d84 | 630 | |
cc3a86c8 DA |
631 | nh_gw = &fib6_nh->fib_nh_gw6; |
632 | dev = fib6_nh->fib_nh_dev; | |
2152caea | 633 | rcu_read_lock_bh(); |
1bef4c22 | 634 | last_probe = READ_ONCE(fib6_nh->last_probe); |
f547fac6 | 635 | idev = __in6_dev_get(dev); |
5e670d84 | 636 | neigh = __ipv6_neigh_lookup_noref(dev, nh_gw); |
2152caea | 637 | if (neigh) { |
8d6c31bf MKL |
638 | if (neigh->nud_state & NUD_VALID) |
639 | goto out; | |
640 | ||
2152caea | 641 | write_lock(&neigh->lock); |
990edb42 MKL |
642 | if (!(neigh->nud_state & NUD_VALID) && |
643 | time_after(jiffies, | |
dcd1f572 | 644 | neigh->updated + idev->cnf.rtr_probe_interval)) { |
990edb42 MKL |
645 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
646 | if (work) | |
647 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 648 | } |
2152caea | 649 | write_unlock(&neigh->lock); |
1bef4c22 | 650 | } else if (time_after(jiffies, last_probe + |
f547fac6 | 651 | idev->cnf.rtr_probe_interval)) { |
990edb42 | 652 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
f2c31e32 | 653 | } |
990edb42 | 654 | |
1bef4c22 ED |
655 | if (!work || cmpxchg(&fib6_nh->last_probe, |
656 | last_probe, jiffies) != last_probe) { | |
657 | kfree(work); | |
658 | } else { | |
990edb42 | 659 | INIT_WORK(&work->work, rt6_probe_deferred); |
5e670d84 DA |
660 | work->target = *nh_gw; |
661 | dev_hold(dev); | |
662 | work->dev = dev; | |
990edb42 MKL |
663 | schedule_work(&work->work); |
664 | } | |
665 | ||
8d6c31bf | 666 | out: |
2152caea | 667 | rcu_read_unlock_bh(); |
27097255 YH |
668 | } |
669 | #else | |
cc3a86c8 | 670 | static inline void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 671 | { |
27097255 YH |
672 | } |
673 | #endif | |
674 | ||
1da177e4 | 675 | /* |
554cfb7e | 676 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 677 | */ |
1ba9a895 | 678 | static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh) |
1da177e4 | 679 | { |
afc154e9 | 680 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
5e670d84 | 681 | struct neighbour *neigh; |
f2c31e32 | 682 | |
145a3621 | 683 | rcu_read_lock_bh(); |
1ba9a895 DA |
684 | neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev, |
685 | &fib6_nh->fib_nh_gw6); | |
145a3621 YH |
686 | if (neigh) { |
687 | read_lock(&neigh->lock); | |
554cfb7e | 688 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 689 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 690 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 691 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 692 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
693 | else |
694 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 695 | #endif |
145a3621 | 696 | read_unlock(&neigh->lock); |
afc154e9 HFS |
697 | } else { |
698 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 699 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 700 | } |
145a3621 YH |
701 | rcu_read_unlock_bh(); |
702 | ||
a5a81f0b | 703 | return ret; |
1da177e4 LT |
704 | } |
705 | ||
702cea56 DA |
706 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
707 | int strict) | |
1da177e4 | 708 | { |
6e1809a5 DA |
709 | int m = 0; |
710 | ||
711 | if (!oif || nh->fib_nh_dev->ifindex == oif) | |
712 | m = 2; | |
1ab1457c | 713 | |
77d16f45 | 714 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 715 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 | 716 | #ifdef CONFIG_IPV6_ROUTER_PREF |
702cea56 | 717 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2; |
ebacaaa0 | 718 | #endif |
1ba9a895 | 719 | if ((strict & RT6_LOOKUP_F_REACHABLE) && |
702cea56 | 720 | !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) { |
1ba9a895 | 721 | int n = rt6_check_neigh(nh); |
afc154e9 HFS |
722 | if (n < 0) |
723 | return n; | |
724 | } | |
554cfb7e YH |
725 | return m; |
726 | } | |
727 | ||
28679ed1 DA |
728 | static bool find_match(struct fib6_nh *nh, u32 fib6_flags, |
729 | int oif, int strict, int *mpri, bool *do_rr) | |
554cfb7e | 730 | { |
afc154e9 | 731 | bool match_do_rr = false; |
28679ed1 DA |
732 | bool rc = false; |
733 | int m; | |
35103d11 | 734 | |
28679ed1 | 735 | if (nh->fib_nh_flags & RTNH_F_DEAD) |
8067bb8c IS |
736 | goto out; |
737 | ||
28679ed1 DA |
738 | if (ip6_ignore_linkdown(nh->fib_nh_dev) && |
739 | nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
d5d32e4b | 740 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) |
35103d11 | 741 | goto out; |
f11e6659 | 742 | |
28679ed1 | 743 | m = rt6_score_route(nh, fib6_flags, oif, strict); |
7e980569 | 744 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
745 | match_do_rr = true; |
746 | m = 0; /* lowest valid score */ | |
7e980569 | 747 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 748 | goto out; |
afc154e9 HFS |
749 | } |
750 | ||
751 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
28679ed1 | 752 | rt6_probe(nh); |
f11e6659 | 753 | |
7e980569 | 754 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 755 | if (m > *mpri) { |
afc154e9 | 756 | *do_rr = match_do_rr; |
f11e6659 | 757 | *mpri = m; |
28679ed1 | 758 | rc = true; |
f11e6659 | 759 | } |
f11e6659 | 760 | out: |
28679ed1 | 761 | return rc; |
f11e6659 DM |
762 | } |
763 | ||
17a5984e DA |
764 | struct fib6_nh_frl_arg { |
765 | u32 flags; | |
766 | int oif; | |
767 | int strict; | |
768 | int *mpri; | |
769 | bool *do_rr; | |
770 | struct fib6_nh *nh; | |
771 | }; | |
772 | ||
773 | static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
774 | { | |
775 | struct fib6_nh_frl_arg *arg = _arg; | |
776 | ||
777 | arg->nh = nh; | |
778 | return find_match(nh, arg->flags, arg->oif, arg->strict, | |
779 | arg->mpri, arg->do_rr); | |
780 | } | |
781 | ||
b7bc4b6a | 782 | static void __find_rr_leaf(struct fib6_info *f6i_start, |
30c15f03 | 783 | struct fib6_info *nomatch, u32 metric, |
b7bc4b6a | 784 | struct fib6_result *res, struct fib6_info **cont, |
30c15f03 | 785 | int oif, int strict, bool *do_rr, int *mpri) |
f11e6659 | 786 | { |
b7bc4b6a | 787 | struct fib6_info *f6i; |
1da177e4 | 788 | |
b7bc4b6a DA |
789 | for (f6i = f6i_start; |
790 | f6i && f6i != nomatch; | |
791 | f6i = rcu_dereference(f6i->fib6_next)) { | |
17a5984e | 792 | bool matched = false; |
30c15f03 DA |
793 | struct fib6_nh *nh; |
794 | ||
b7bc4b6a DA |
795 | if (cont && f6i->fib6_metric != metric) { |
796 | *cont = f6i; | |
30c15f03 | 797 | return; |
9fbdcfaf SK |
798 | } |
799 | ||
b7bc4b6a | 800 | if (fib6_check_expired(f6i)) |
28679ed1 DA |
801 | continue; |
802 | ||
17a5984e DA |
803 | if (unlikely(f6i->nh)) { |
804 | struct fib6_nh_frl_arg arg = { | |
805 | .flags = f6i->fib6_flags, | |
806 | .oif = oif, | |
807 | .strict = strict, | |
808 | .mpri = mpri, | |
809 | .do_rr = do_rr | |
810 | }; | |
811 | ||
812 | if (nexthop_is_blackhole(f6i->nh)) { | |
813 | res->fib6_flags = RTF_REJECT; | |
814 | res->fib6_type = RTN_BLACKHOLE; | |
815 | res->f6i = f6i; | |
816 | res->nh = nexthop_fib6_nh(f6i->nh); | |
817 | return; | |
818 | } | |
819 | if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match, | |
820 | &arg)) { | |
821 | matched = true; | |
822 | nh = arg.nh; | |
823 | } | |
824 | } else { | |
825 | nh = f6i->fib6_nh; | |
826 | if (find_match(nh, f6i->fib6_flags, oif, strict, | |
827 | mpri, do_rr)) | |
828 | matched = true; | |
829 | } | |
830 | if (matched) { | |
b7bc4b6a DA |
831 | res->f6i = f6i; |
832 | res->nh = nh; | |
7d21fec9 DA |
833 | res->fib6_flags = f6i->fib6_flags; |
834 | res->fib6_type = f6i->fib6_type; | |
b7bc4b6a | 835 | } |
9fbdcfaf | 836 | } |
30c15f03 | 837 | } |
9fbdcfaf | 838 | |
b7bc4b6a DA |
839 | static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf, |
840 | struct fib6_info *rr_head, int oif, int strict, | |
841 | bool *do_rr, struct fib6_result *res) | |
30c15f03 | 842 | { |
b7bc4b6a DA |
843 | u32 metric = rr_head->fib6_metric; |
844 | struct fib6_info *cont = NULL; | |
30c15f03 | 845 | int mpri = -1; |
9fbdcfaf | 846 | |
b7bc4b6a | 847 | __find_rr_leaf(rr_head, NULL, metric, res, &cont, |
30c15f03 | 848 | oif, strict, do_rr, &mpri); |
28679ed1 | 849 | |
b7bc4b6a | 850 | __find_rr_leaf(leaf, rr_head, metric, res, &cont, |
30c15f03 | 851 | oif, strict, do_rr, &mpri); |
9fbdcfaf | 852 | |
b7bc4b6a DA |
853 | if (res->f6i || !cont) |
854 | return; | |
9fbdcfaf | 855 | |
b7bc4b6a | 856 | __find_rr_leaf(cont, NULL, metric, res, NULL, |
30c15f03 | 857 | oif, strict, do_rr, &mpri); |
f11e6659 | 858 | } |
1da177e4 | 859 | |
b7bc4b6a DA |
860 | static void rt6_select(struct net *net, struct fib6_node *fn, int oif, |
861 | struct fib6_result *res, int strict) | |
f11e6659 | 862 | { |
8d1c802b | 863 | struct fib6_info *leaf = rcu_dereference(fn->leaf); |
b7bc4b6a | 864 | struct fib6_info *rt0; |
afc154e9 | 865 | bool do_rr = false; |
17ecf590 | 866 | int key_plen; |
1da177e4 | 867 | |
b7bc4b6a DA |
868 | /* make sure this function or its helpers sets f6i */ |
869 | res->f6i = NULL; | |
870 | ||
421842ed | 871 | if (!leaf || leaf == net->ipv6.fib6_null_entry) |
b7bc4b6a | 872 | goto out; |
8d1040e8 | 873 | |
66f5d6ce | 874 | rt0 = rcu_dereference(fn->rr_ptr); |
f11e6659 | 875 | if (!rt0) |
66f5d6ce | 876 | rt0 = leaf; |
1da177e4 | 877 | |
17ecf590 WW |
878 | /* Double check to make sure fn is not an intermediate node |
879 | * and fn->leaf does not points to its child's leaf | |
880 | * (This might happen if all routes under fn are deleted from | |
881 | * the tree and fib6_repair_tree() is called on the node.) | |
882 | */ | |
93c2fb25 | 883 | key_plen = rt0->fib6_dst.plen; |
17ecf590 | 884 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
885 | if (rt0->fib6_src.plen) |
886 | key_plen = rt0->fib6_src.plen; | |
17ecf590 WW |
887 | #endif |
888 | if (fn->fn_bit != key_plen) | |
b7bc4b6a | 889 | goto out; |
1da177e4 | 890 | |
b7bc4b6a | 891 | find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res); |
afc154e9 | 892 | if (do_rr) { |
8fb11a9a | 893 | struct fib6_info *next = rcu_dereference(rt0->fib6_next); |
f11e6659 | 894 | |
554cfb7e | 895 | /* no entries matched; do round-robin */ |
93c2fb25 | 896 | if (!next || next->fib6_metric != rt0->fib6_metric) |
8d1040e8 | 897 | next = leaf; |
f11e6659 | 898 | |
66f5d6ce | 899 | if (next != rt0) { |
93c2fb25 | 900 | spin_lock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 901 | /* make sure next is not being deleted from the tree */ |
93c2fb25 | 902 | if (next->fib6_node) |
66f5d6ce | 903 | rcu_assign_pointer(fn->rr_ptr, next); |
93c2fb25 | 904 | spin_unlock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 905 | } |
1da177e4 | 906 | } |
1da177e4 | 907 | |
b7bc4b6a DA |
908 | out: |
909 | if (!res->f6i) { | |
910 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 911 | res->nh = res->f6i->fib6_nh; |
7d21fec9 DA |
912 | res->fib6_flags = res->f6i->fib6_flags; |
913 | res->fib6_type = res->f6i->fib6_type; | |
b7bc4b6a | 914 | } |
1da177e4 LT |
915 | } |
916 | ||
85bd05de | 917 | static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res) |
8b9df265 | 918 | { |
85bd05de DA |
919 | return (res->f6i->fib6_flags & RTF_NONEXTHOP) || |
920 | res->nh->fib_nh_gw_family; | |
8b9df265 MKL |
921 | } |
922 | ||
70ceb4f5 YH |
923 | #ifdef CONFIG_IPV6_ROUTE_INFO |
924 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 925 | const struct in6_addr *gwaddr) |
70ceb4f5 | 926 | { |
c346dca1 | 927 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
928 | struct route_info *rinfo = (struct route_info *) opt; |
929 | struct in6_addr prefix_buf, *prefix; | |
930 | unsigned int pref; | |
4bed72e4 | 931 | unsigned long lifetime; |
8d1c802b | 932 | struct fib6_info *rt; |
70ceb4f5 YH |
933 | |
934 | if (len < sizeof(struct route_info)) { | |
935 | return -EINVAL; | |
936 | } | |
937 | ||
938 | /* Sanity check for prefix_len and length */ | |
939 | if (rinfo->length > 3) { | |
940 | return -EINVAL; | |
941 | } else if (rinfo->prefix_len > 128) { | |
942 | return -EINVAL; | |
943 | } else if (rinfo->prefix_len > 64) { | |
944 | if (rinfo->length < 2) { | |
945 | return -EINVAL; | |
946 | } | |
947 | } else if (rinfo->prefix_len > 0) { | |
948 | if (rinfo->length < 1) { | |
949 | return -EINVAL; | |
950 | } | |
951 | } | |
952 | ||
953 | pref = rinfo->route_pref; | |
954 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 955 | return -EINVAL; |
70ceb4f5 | 956 | |
4bed72e4 | 957 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
958 | |
959 | if (rinfo->length == 3) | |
960 | prefix = (struct in6_addr *)rinfo->prefix; | |
961 | else { | |
962 | /* this function is safe */ | |
963 | ipv6_addr_prefix(&prefix_buf, | |
964 | (struct in6_addr *)rinfo->prefix, | |
965 | rinfo->prefix_len); | |
966 | prefix = &prefix_buf; | |
967 | } | |
968 | ||
f104a567 | 969 | if (rinfo->prefix_len == 0) |
afb1d4b5 | 970 | rt = rt6_get_dflt_router(net, gwaddr, dev); |
f104a567 DJ |
971 | else |
972 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 973 | gwaddr, dev); |
70ceb4f5 YH |
974 | |
975 | if (rt && !lifetime) { | |
11dd74b3 | 976 | ip6_del_rt(net, rt, false); |
70ceb4f5 YH |
977 | rt = NULL; |
978 | } | |
979 | ||
980 | if (!rt && lifetime) | |
830218c1 DA |
981 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
982 | dev, pref); | |
70ceb4f5 | 983 | else if (rt) |
93c2fb25 DA |
984 | rt->fib6_flags = RTF_ROUTEINFO | |
985 | (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
70ceb4f5 YH |
986 | |
987 | if (rt) { | |
1716a961 | 988 | if (!addrconf_finite_timeout(lifetime)) |
14895687 | 989 | fib6_clean_expires(rt); |
1716a961 | 990 | else |
14895687 | 991 | fib6_set_expires(rt, jiffies + HZ * lifetime); |
1716a961 | 992 | |
93531c67 | 993 | fib6_info_release(rt); |
70ceb4f5 YH |
994 | } |
995 | return 0; | |
996 | } | |
997 | #endif | |
998 | ||
ae90d867 DA |
999 | /* |
1000 | * Misc support functions | |
1001 | */ | |
1002 | ||
1003 | /* called with rcu_lock held */ | |
0d161581 | 1004 | static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res) |
ae90d867 | 1005 | { |
0d161581 | 1006 | struct net_device *dev = res->nh->fib_nh_dev; |
ae90d867 | 1007 | |
7d21fec9 | 1008 | if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) { |
ae90d867 DA |
1009 | /* for copies of local routes, dst->dev needs to be the |
1010 | * device if it is a master device, the master device if | |
1011 | * device is enslaved, and the loopback as the default | |
1012 | */ | |
1013 | if (netif_is_l3_slave(dev) && | |
7d21fec9 | 1014 | !rt6_need_strict(&res->f6i->fib6_dst.addr)) |
ae90d867 DA |
1015 | dev = l3mdev_master_dev_rcu(dev); |
1016 | else if (!netif_is_l3_master(dev)) | |
1017 | dev = dev_net(dev)->loopback_dev; | |
1018 | /* last case is netif_is_l3_master(dev) is true in which | |
1019 | * case we want dev returned to be dev | |
1020 | */ | |
1021 | } | |
1022 | ||
1023 | return dev; | |
1024 | } | |
1025 | ||
6edb3c96 DA |
1026 | static const int fib6_prop[RTN_MAX + 1] = { |
1027 | [RTN_UNSPEC] = 0, | |
1028 | [RTN_UNICAST] = 0, | |
1029 | [RTN_LOCAL] = 0, | |
1030 | [RTN_BROADCAST] = 0, | |
1031 | [RTN_ANYCAST] = 0, | |
1032 | [RTN_MULTICAST] = 0, | |
1033 | [RTN_BLACKHOLE] = -EINVAL, | |
1034 | [RTN_UNREACHABLE] = -EHOSTUNREACH, | |
1035 | [RTN_PROHIBIT] = -EACCES, | |
1036 | [RTN_THROW] = -EAGAIN, | |
1037 | [RTN_NAT] = -EINVAL, | |
1038 | [RTN_XRESOLVE] = -EINVAL, | |
1039 | }; | |
1040 | ||
1041 | static int ip6_rt_type_to_error(u8 fib6_type) | |
1042 | { | |
1043 | return fib6_prop[fib6_type]; | |
1044 | } | |
1045 | ||
8d1c802b | 1046 | static unsigned short fib6_info_dst_flags(struct fib6_info *rt) |
3b6761d1 DA |
1047 | { |
1048 | unsigned short flags = 0; | |
1049 | ||
1050 | if (rt->dst_nocount) | |
1051 | flags |= DST_NOCOUNT; | |
1052 | if (rt->dst_nopolicy) | |
1053 | flags |= DST_NOPOLICY; | |
3b6761d1 DA |
1054 | |
1055 | return flags; | |
1056 | } | |
1057 | ||
7d21fec9 | 1058 | static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type) |
6edb3c96 | 1059 | { |
7d21fec9 | 1060 | rt->dst.error = ip6_rt_type_to_error(fib6_type); |
6edb3c96 | 1061 | |
7d21fec9 | 1062 | switch (fib6_type) { |
6edb3c96 DA |
1063 | case RTN_BLACKHOLE: |
1064 | rt->dst.output = dst_discard_out; | |
1065 | rt->dst.input = dst_discard; | |
1066 | break; | |
1067 | case RTN_PROHIBIT: | |
1068 | rt->dst.output = ip6_pkt_prohibit_out; | |
1069 | rt->dst.input = ip6_pkt_prohibit; | |
1070 | break; | |
1071 | case RTN_THROW: | |
1072 | case RTN_UNREACHABLE: | |
1073 | default: | |
1074 | rt->dst.output = ip6_pkt_discard_out; | |
1075 | rt->dst.input = ip6_pkt_discard; | |
1076 | break; | |
1077 | } | |
1078 | } | |
1079 | ||
0d161581 | 1080 | static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res) |
6edb3c96 | 1081 | { |
7d21fec9 | 1082 | struct fib6_info *f6i = res->f6i; |
0d161581 | 1083 | |
7d21fec9 DA |
1084 | if (res->fib6_flags & RTF_REJECT) { |
1085 | ip6_rt_init_dst_reject(rt, res->fib6_type); | |
6edb3c96 DA |
1086 | return; |
1087 | } | |
1088 | ||
1089 | rt->dst.error = 0; | |
1090 | rt->dst.output = ip6_output; | |
1091 | ||
7d21fec9 | 1092 | if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) { |
6edb3c96 | 1093 | rt->dst.input = ip6_input; |
7d21fec9 | 1094 | } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) { |
6edb3c96 DA |
1095 | rt->dst.input = ip6_mc_input; |
1096 | } else { | |
1097 | rt->dst.input = ip6_forward; | |
1098 | } | |
1099 | ||
0d161581 DA |
1100 | if (res->nh->fib_nh_lws) { |
1101 | rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws); | |
6edb3c96 DA |
1102 | lwtunnel_set_redirect(&rt->dst); |
1103 | } | |
1104 | ||
1105 | rt->dst.lastuse = jiffies; | |
1106 | } | |
1107 | ||
e873e4b9 | 1108 | /* Caller must already hold reference to @from */ |
8d1c802b | 1109 | static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from) |
ae90d867 | 1110 | { |
ae90d867 | 1111 | rt->rt6i_flags &= ~RTF_EXPIRES; |
a68886a6 | 1112 | rcu_assign_pointer(rt->from, from); |
e1255ed4 | 1113 | ip_dst_init_metrics(&rt->dst, from->fib6_metrics); |
ae90d867 DA |
1114 | } |
1115 | ||
0d161581 DA |
1116 | /* Caller must already hold reference to f6i in result */ |
1117 | static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res) | |
ae90d867 | 1118 | { |
0d161581 DA |
1119 | const struct fib6_nh *nh = res->nh; |
1120 | const struct net_device *dev = nh->fib_nh_dev; | |
1121 | struct fib6_info *f6i = res->f6i; | |
dcd1f572 | 1122 | |
0d161581 | 1123 | ip6_rt_init_dst(rt, res); |
6edb3c96 | 1124 | |
0d161581 | 1125 | rt->rt6i_dst = f6i->fib6_dst; |
dcd1f572 | 1126 | rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; |
7d21fec9 | 1127 | rt->rt6i_flags = res->fib6_flags; |
0d161581 DA |
1128 | if (nh->fib_nh_gw_family) { |
1129 | rt->rt6i_gateway = nh->fib_nh_gw6; | |
2b2450ca DA |
1130 | rt->rt6i_flags |= RTF_GATEWAY; |
1131 | } | |
0d161581 | 1132 | rt6_set_from(rt, f6i); |
ae90d867 | 1133 | #ifdef CONFIG_IPV6_SUBTREES |
0d161581 | 1134 | rt->rt6i_src = f6i->fib6_src; |
ae90d867 | 1135 | #endif |
ae90d867 DA |
1136 | } |
1137 | ||
a3c00e46 MKL |
1138 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
1139 | struct in6_addr *saddr) | |
1140 | { | |
66f5d6ce | 1141 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
1142 | while (1) { |
1143 | if (fn->fn_flags & RTN_TL_ROOT) | |
1144 | return NULL; | |
66f5d6ce WW |
1145 | pn = rcu_dereference(fn->parent); |
1146 | sn = FIB6_SUBTREE(pn); | |
1147 | if (sn && sn != fn) | |
6454743b | 1148 | fn = fib6_node_lookup(sn, NULL, saddr); |
a3c00e46 MKL |
1149 | else |
1150 | fn = pn; | |
1151 | if (fn->fn_flags & RTN_RTINFO) | |
1152 | return fn; | |
1153 | } | |
1154 | } | |
c71099ac | 1155 | |
10585b43 | 1156 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt) |
d3843fe5 WW |
1157 | { |
1158 | struct rt6_info *rt = *prt; | |
1159 | ||
1160 | if (dst_hold_safe(&rt->dst)) | |
1161 | return true; | |
10585b43 | 1162 | if (net) { |
d3843fe5 WW |
1163 | rt = net->ipv6.ip6_null_entry; |
1164 | dst_hold(&rt->dst); | |
1165 | } else { | |
1166 | rt = NULL; | |
1167 | } | |
1168 | *prt = rt; | |
1169 | return false; | |
1170 | } | |
1171 | ||
dec9b0e2 | 1172 | /* called with rcu_lock held */ |
9b6b35ab | 1173 | static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res) |
dec9b0e2 | 1174 | { |
9b6b35ab DA |
1175 | struct net_device *dev = res->nh->fib_nh_dev; |
1176 | struct fib6_info *f6i = res->f6i; | |
1177 | unsigned short flags; | |
dec9b0e2 DA |
1178 | struct rt6_info *nrt; |
1179 | ||
9b6b35ab | 1180 | if (!fib6_info_hold_safe(f6i)) |
1c87e79a | 1181 | goto fallback; |
e873e4b9 | 1182 | |
9b6b35ab | 1183 | flags = fib6_info_dst_flags(f6i); |
93531c67 | 1184 | nrt = ip6_dst_alloc(dev_net(dev), dev, flags); |
1c87e79a | 1185 | if (!nrt) { |
9b6b35ab | 1186 | fib6_info_release(f6i); |
1c87e79a XL |
1187 | goto fallback; |
1188 | } | |
dec9b0e2 | 1189 | |
0d161581 | 1190 | ip6_rt_copy_init(nrt, res); |
1c87e79a XL |
1191 | return nrt; |
1192 | ||
1193 | fallback: | |
1194 | nrt = dev_net(dev)->ipv6.ip6_null_entry; | |
1195 | dst_hold(&nrt->dst); | |
dec9b0e2 DA |
1196 | return nrt; |
1197 | } | |
1198 | ||
55cced4f | 1199 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_lookup(struct net *net, |
8ed67789 | 1200 | struct fib6_table *table, |
b75cc8f9 DA |
1201 | struct flowi6 *fl6, |
1202 | const struct sk_buff *skb, | |
1203 | int flags) | |
1da177e4 | 1204 | { |
b1d40991 | 1205 | struct fib6_result res = {}; |
1da177e4 | 1206 | struct fib6_node *fn; |
23fb93a4 | 1207 | struct rt6_info *rt; |
1da177e4 | 1208 | |
b6cdbc85 DA |
1209 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1210 | flags &= ~RT6_LOOKUP_F_IFACE; | |
1211 | ||
66f5d6ce | 1212 | rcu_read_lock(); |
6454743b | 1213 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 1214 | restart: |
b1d40991 DA |
1215 | res.f6i = rcu_dereference(fn->leaf); |
1216 | if (!res.f6i) | |
1217 | res.f6i = net->ipv6.fib6_null_entry; | |
af52a52c | 1218 | else |
75ef7389 DA |
1219 | rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif, |
1220 | flags); | |
af52a52c | 1221 | |
b1d40991 | 1222 | if (res.f6i == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
1223 | fn = fib6_backtrack(fn, &fl6->saddr); |
1224 | if (fn) | |
1225 | goto restart; | |
2b760fcf | 1226 | |
af52a52c DA |
1227 | rt = net->ipv6.ip6_null_entry; |
1228 | dst_hold(&rt->dst); | |
1229 | goto out; | |
f88d8ea6 DA |
1230 | } else if (res.fib6_flags & RTF_REJECT) { |
1231 | goto do_create; | |
af52a52c | 1232 | } |
d3843fe5 | 1233 | |
b1d40991 DA |
1234 | fib6_select_path(net, &res, fl6, fl6->flowi6_oif, |
1235 | fl6->flowi6_oif != 0, skb, flags); | |
1236 | ||
2b760fcf | 1237 | /* Search through exception table */ |
7e4b5128 | 1238 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 1239 | if (rt) { |
10585b43 | 1240 | if (ip6_hold_safe(net, &rt)) |
dec9b0e2 | 1241 | dst_use_noref(&rt->dst, jiffies); |
23fb93a4 | 1242 | } else { |
f88d8ea6 | 1243 | do_create: |
9b6b35ab | 1244 | rt = ip6_create_rt_rcu(&res); |
dec9b0e2 | 1245 | } |
b811580d | 1246 | |
af52a52c | 1247 | out: |
8ff2e5b2 | 1248 | trace_fib6_table_lookup(net, &res, table, fl6); |
af52a52c | 1249 | |
66f5d6ce | 1250 | rcu_read_unlock(); |
b811580d | 1251 | |
c71099ac | 1252 | return rt; |
c71099ac TG |
1253 | } |
1254 | ||
67ba4152 | 1255 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 1256 | const struct sk_buff *skb, int flags) |
ea6e574e | 1257 | { |
b75cc8f9 | 1258 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup); |
ea6e574e FW |
1259 | } |
1260 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
1261 | ||
9acd9f3a | 1262 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
1263 | const struct in6_addr *saddr, int oif, |
1264 | const struct sk_buff *skb, int strict) | |
c71099ac | 1265 | { |
4c9483b2 DM |
1266 | struct flowi6 fl6 = { |
1267 | .flowi6_oif = oif, | |
1268 | .daddr = *daddr, | |
c71099ac TG |
1269 | }; |
1270 | struct dst_entry *dst; | |
77d16f45 | 1271 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 1272 | |
adaa70bb | 1273 | if (saddr) { |
4c9483b2 | 1274 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
1275 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1276 | } | |
1277 | ||
b75cc8f9 | 1278 | dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup); |
c71099ac TG |
1279 | if (dst->error == 0) |
1280 | return (struct rt6_info *) dst; | |
1281 | ||
1282 | dst_release(dst); | |
1283 | ||
1da177e4 LT |
1284 | return NULL; |
1285 | } | |
7159039a YH |
1286 | EXPORT_SYMBOL(rt6_lookup); |
1287 | ||
c71099ac | 1288 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
1289 | * It takes new route entry, the addition fails by any reason the |
1290 | * route is released. | |
1291 | * Caller must hold dst before calling it. | |
1da177e4 LT |
1292 | */ |
1293 | ||
8d1c802b | 1294 | static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info, |
333c4301 | 1295 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1296 | { |
1297 | int err; | |
c71099ac | 1298 | struct fib6_table *table; |
1da177e4 | 1299 | |
93c2fb25 | 1300 | table = rt->fib6_table; |
66f5d6ce | 1301 | spin_lock_bh(&table->tb6_lock); |
d4ead6b3 | 1302 | err = fib6_add(&table->tb6_root, rt, info, extack); |
66f5d6ce | 1303 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1304 | |
1305 | return err; | |
1306 | } | |
1307 | ||
8d1c802b | 1308 | int ip6_ins_rt(struct net *net, struct fib6_info *rt) |
40e22e8f | 1309 | { |
afb1d4b5 | 1310 | struct nl_info info = { .nl_net = net, }; |
e715b6d3 | 1311 | |
d4ead6b3 | 1312 | return __ip6_ins_rt(rt, &info, NULL); |
40e22e8f TG |
1313 | } |
1314 | ||
85bd05de | 1315 | static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res, |
8b9df265 MKL |
1316 | const struct in6_addr *daddr, |
1317 | const struct in6_addr *saddr) | |
1da177e4 | 1318 | { |
85bd05de | 1319 | struct fib6_info *f6i = res->f6i; |
4832c30d | 1320 | struct net_device *dev; |
1da177e4 LT |
1321 | struct rt6_info *rt; |
1322 | ||
1323 | /* | |
1324 | * Clone the route. | |
1325 | */ | |
1326 | ||
85bd05de | 1327 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1328 | return NULL; |
1329 | ||
0d161581 | 1330 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1331 | rt = ip6_dst_alloc(dev_net(dev), dev, 0); |
e873e4b9 | 1332 | if (!rt) { |
85bd05de | 1333 | fib6_info_release(f6i); |
83a09abd | 1334 | return NULL; |
e873e4b9 | 1335 | } |
83a09abd | 1336 | |
0d161581 | 1337 | ip6_rt_copy_init(rt, res); |
83a09abd | 1338 | rt->rt6i_flags |= RTF_CACHE; |
83a09abd MKL |
1339 | rt->rt6i_dst.addr = *daddr; |
1340 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1341 | |
85bd05de DA |
1342 | if (!rt6_is_gw_or_nonexthop(res)) { |
1343 | if (f6i->fib6_dst.plen != 128 && | |
1344 | ipv6_addr_equal(&f6i->fib6_dst.addr, daddr)) | |
83a09abd | 1345 | rt->rt6i_flags |= RTF_ANYCAST; |
1da177e4 | 1346 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1347 | if (rt->rt6i_src.plen && saddr) { |
1348 | rt->rt6i_src.addr = *saddr; | |
1349 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1350 | } |
83a09abd | 1351 | #endif |
95a9a5ba | 1352 | } |
1da177e4 | 1353 | |
95a9a5ba YH |
1354 | return rt; |
1355 | } | |
1da177e4 | 1356 | |
db3fedee | 1357 | static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res) |
d52d3997 | 1358 | { |
db3fedee DA |
1359 | struct fib6_info *f6i = res->f6i; |
1360 | unsigned short flags = fib6_info_dst_flags(f6i); | |
4832c30d | 1361 | struct net_device *dev; |
d52d3997 MKL |
1362 | struct rt6_info *pcpu_rt; |
1363 | ||
db3fedee | 1364 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1365 | return NULL; |
1366 | ||
4832c30d | 1367 | rcu_read_lock(); |
0d161581 | 1368 | dev = ip6_rt_get_dev_rcu(res); |
d8882935 | 1369 | pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags | DST_NOCOUNT); |
4832c30d | 1370 | rcu_read_unlock(); |
e873e4b9 | 1371 | if (!pcpu_rt) { |
db3fedee | 1372 | fib6_info_release(f6i); |
d52d3997 | 1373 | return NULL; |
e873e4b9 | 1374 | } |
0d161581 | 1375 | ip6_rt_copy_init(pcpu_rt, res); |
d52d3997 | 1376 | pcpu_rt->rt6i_flags |= RTF_PCPU; |
8f34e53b DA |
1377 | |
1378 | if (f6i->nh) | |
1379 | pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev)); | |
1380 | ||
d52d3997 MKL |
1381 | return pcpu_rt; |
1382 | } | |
1383 | ||
8f34e53b DA |
1384 | static bool rt6_is_valid(const struct rt6_info *rt6) |
1385 | { | |
1386 | return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev)); | |
1387 | } | |
1388 | ||
66f5d6ce | 1389 | /* It should be called with rcu_read_lock() acquired */ |
db3fedee | 1390 | static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res) |
d52d3997 | 1391 | { |
c353071a | 1392 | struct rt6_info *pcpu_rt; |
d52d3997 | 1393 | |
c353071a | 1394 | pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu); |
d52d3997 | 1395 | |
8f34e53b DA |
1396 | if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) { |
1397 | struct rt6_info *prev, **p; | |
1398 | ||
1399 | p = this_cpu_ptr(res->nh->rt6i_pcpu); | |
1400 | prev = xchg(p, NULL); | |
1401 | if (prev) { | |
1402 | dst_dev_put(&prev->dst); | |
1403 | dst_release(&prev->dst); | |
1404 | } | |
1405 | ||
1406 | pcpu_rt = NULL; | |
1407 | } | |
1408 | ||
a73e4195 MKL |
1409 | return pcpu_rt; |
1410 | } | |
1411 | ||
afb1d4b5 | 1412 | static struct rt6_info *rt6_make_pcpu_route(struct net *net, |
db3fedee | 1413 | const struct fib6_result *res) |
a73e4195 MKL |
1414 | { |
1415 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 | 1416 | |
db3fedee | 1417 | pcpu_rt = ip6_rt_pcpu_alloc(res); |
0e09edcc WW |
1418 | if (!pcpu_rt) |
1419 | return NULL; | |
d52d3997 | 1420 | |
f40b6ae2 | 1421 | p = this_cpu_ptr(res->nh->rt6i_pcpu); |
a94b9367 | 1422 | prev = cmpxchg(p, NULL, pcpu_rt); |
951f788a | 1423 | BUG_ON(prev); |
a94b9367 | 1424 | |
61fb0d01 ED |
1425 | if (res->f6i->fib6_destroying) { |
1426 | struct fib6_info *from; | |
1427 | ||
1428 | from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL); | |
1429 | fib6_info_release(from); | |
1430 | } | |
1431 | ||
d52d3997 MKL |
1432 | return pcpu_rt; |
1433 | } | |
1434 | ||
35732d01 WW |
1435 | /* exception hash table implementation |
1436 | */ | |
1437 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1438 | ||
1439 | /* Remove rt6_ex from hash table and free the memory | |
1440 | * Caller must hold rt6_exception_lock | |
1441 | */ | |
1442 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1443 | struct rt6_exception *rt6_ex) | |
1444 | { | |
f5b51fe8 | 1445 | struct fib6_info *from; |
b2427e67 | 1446 | struct net *net; |
81eb8447 | 1447 | |
35732d01 WW |
1448 | if (!bucket || !rt6_ex) |
1449 | return; | |
b2427e67 CIK |
1450 | |
1451 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
f5b51fe8 PA |
1452 | net->ipv6.rt6_stats->fib_rt_cache--; |
1453 | ||
1454 | /* purge completely the exception to allow releasing the held resources: | |
1455 | * some [sk] cache may keep the dst around for unlimited time | |
1456 | */ | |
0e233874 | 1457 | from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL); |
f5b51fe8 PA |
1458 | fib6_info_release(from); |
1459 | dst_dev_put(&rt6_ex->rt6i->dst); | |
1460 | ||
35732d01 | 1461 | hlist_del_rcu(&rt6_ex->hlist); |
77634cc6 | 1462 | dst_release(&rt6_ex->rt6i->dst); |
35732d01 WW |
1463 | kfree_rcu(rt6_ex, rcu); |
1464 | WARN_ON_ONCE(!bucket->depth); | |
1465 | bucket->depth--; | |
1466 | } | |
1467 | ||
1468 | /* Remove oldest rt6_ex in bucket and free the memory | |
1469 | * Caller must hold rt6_exception_lock | |
1470 | */ | |
1471 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1472 | { | |
1473 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1474 | ||
1475 | if (!bucket) | |
1476 | return; | |
1477 | ||
1478 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1479 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1480 | oldest = rt6_ex; | |
1481 | } | |
1482 | rt6_remove_exception(bucket, oldest); | |
1483 | } | |
1484 | ||
1485 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1486 | const struct in6_addr *src) | |
1487 | { | |
4785305c ED |
1488 | static siphash_key_t rt6_exception_key __read_mostly; |
1489 | struct { | |
1490 | struct in6_addr dst; | |
1491 | struct in6_addr src; | |
1492 | } __aligned(SIPHASH_ALIGNMENT) combined = { | |
1493 | .dst = *dst, | |
1494 | }; | |
1495 | u64 val; | |
35732d01 | 1496 | |
4785305c | 1497 | net_get_random_once(&rt6_exception_key, sizeof(rt6_exception_key)); |
35732d01 WW |
1498 | |
1499 | #ifdef CONFIG_IPV6_SUBTREES | |
1500 | if (src) | |
4785305c | 1501 | combined.src = *src; |
35732d01 | 1502 | #endif |
4785305c ED |
1503 | val = siphash(&combined, sizeof(combined), &rt6_exception_key); |
1504 | ||
1505 | return hash_64(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
35732d01 WW |
1506 | } |
1507 | ||
1508 | /* Helper function to find the cached rt in the hash table | |
1509 | * and update bucket pointer to point to the bucket for this | |
1510 | * (daddr, saddr) pair | |
1511 | * Caller must hold rt6_exception_lock | |
1512 | */ | |
1513 | static struct rt6_exception * | |
1514 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1515 | const struct in6_addr *daddr, | |
1516 | const struct in6_addr *saddr) | |
1517 | { | |
1518 | struct rt6_exception *rt6_ex; | |
1519 | u32 hval; | |
1520 | ||
1521 | if (!(*bucket) || !daddr) | |
1522 | return NULL; | |
1523 | ||
1524 | hval = rt6_exception_hash(daddr, saddr); | |
1525 | *bucket += hval; | |
1526 | ||
1527 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1528 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1529 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1530 | ||
1531 | #ifdef CONFIG_IPV6_SUBTREES | |
1532 | if (matched && saddr) | |
1533 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1534 | #endif | |
1535 | if (matched) | |
1536 | return rt6_ex; | |
1537 | } | |
1538 | return NULL; | |
1539 | } | |
1540 | ||
1541 | /* Helper function to find the cached rt in the hash table | |
1542 | * and update bucket pointer to point to the bucket for this | |
1543 | * (daddr, saddr) pair | |
1544 | * Caller must hold rcu_read_lock() | |
1545 | */ | |
1546 | static struct rt6_exception * | |
1547 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1548 | const struct in6_addr *daddr, | |
1549 | const struct in6_addr *saddr) | |
1550 | { | |
1551 | struct rt6_exception *rt6_ex; | |
1552 | u32 hval; | |
1553 | ||
1554 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1555 | ||
1556 | if (!(*bucket) || !daddr) | |
1557 | return NULL; | |
1558 | ||
1559 | hval = rt6_exception_hash(daddr, saddr); | |
1560 | *bucket += hval; | |
1561 | ||
1562 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1563 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1564 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1565 | ||
1566 | #ifdef CONFIG_IPV6_SUBTREES | |
1567 | if (matched && saddr) | |
1568 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1569 | #endif | |
1570 | if (matched) | |
1571 | return rt6_ex; | |
1572 | } | |
1573 | return NULL; | |
1574 | } | |
1575 | ||
b748f260 | 1576 | static unsigned int fib6_mtu(const struct fib6_result *res) |
d4ead6b3 | 1577 | { |
b748f260 | 1578 | const struct fib6_nh *nh = res->nh; |
d4ead6b3 DA |
1579 | unsigned int mtu; |
1580 | ||
b748f260 DA |
1581 | if (res->f6i->fib6_pmtu) { |
1582 | mtu = res->f6i->fib6_pmtu; | |
dcd1f572 | 1583 | } else { |
b748f260 | 1584 | struct net_device *dev = nh->fib_nh_dev; |
dcd1f572 DA |
1585 | struct inet6_dev *idev; |
1586 | ||
1587 | rcu_read_lock(); | |
1588 | idev = __in6_dev_get(dev); | |
1589 | mtu = idev->cnf.mtu6; | |
1590 | rcu_read_unlock(); | |
1591 | } | |
1592 | ||
d4ead6b3 DA |
1593 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1594 | ||
b748f260 | 1595 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
d4ead6b3 DA |
1596 | } |
1597 | ||
cc5c073a DA |
1598 | #define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL |
1599 | ||
1600 | /* used when the flushed bit is not relevant, only access to the bucket | |
1601 | * (ie., all bucket users except rt6_insert_exception); | |
1602 | * | |
1603 | * called under rcu lock; sometimes called with rt6_exception_lock held | |
1604 | */ | |
1605 | static | |
1606 | struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh, | |
1607 | spinlock_t *lock) | |
1608 | { | |
1609 | struct rt6_exception_bucket *bucket; | |
1610 | ||
1611 | if (lock) | |
1612 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1613 | lockdep_is_held(lock)); | |
1614 | else | |
1615 | bucket = rcu_dereference(nh->rt6i_exception_bucket); | |
1616 | ||
1617 | /* remove bucket flushed bit if set */ | |
1618 | if (bucket) { | |
1619 | unsigned long p = (unsigned long)bucket; | |
1620 | ||
1621 | p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1622 | bucket = (struct rt6_exception_bucket *)p; | |
1623 | } | |
1624 | ||
1625 | return bucket; | |
1626 | } | |
1627 | ||
1628 | static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket) | |
1629 | { | |
1630 | unsigned long p = (unsigned long)bucket; | |
1631 | ||
1632 | return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED); | |
1633 | } | |
1634 | ||
1635 | /* called with rt6_exception_lock held */ | |
1636 | static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh, | |
1637 | spinlock_t *lock) | |
1638 | { | |
1639 | struct rt6_exception_bucket *bucket; | |
1640 | unsigned long p; | |
1641 | ||
1642 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1643 | lockdep_is_held(lock)); | |
1644 | ||
1645 | p = (unsigned long)bucket; | |
1646 | p |= FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1647 | bucket = (struct rt6_exception_bucket *)p; | |
1648 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); | |
1649 | } | |
1650 | ||
35732d01 | 1651 | static int rt6_insert_exception(struct rt6_info *nrt, |
5012f0a5 | 1652 | const struct fib6_result *res) |
35732d01 | 1653 | { |
5e670d84 | 1654 | struct net *net = dev_net(nrt->dst.dev); |
35732d01 | 1655 | struct rt6_exception_bucket *bucket; |
cc5c073a | 1656 | struct fib6_info *f6i = res->f6i; |
35732d01 WW |
1657 | struct in6_addr *src_key = NULL; |
1658 | struct rt6_exception *rt6_ex; | |
cc5c073a | 1659 | struct fib6_nh *nh = res->nh; |
a00df2ca | 1660 | int max_depth; |
35732d01 WW |
1661 | int err = 0; |
1662 | ||
35732d01 WW |
1663 | spin_lock_bh(&rt6_exception_lock); |
1664 | ||
cc5c073a DA |
1665 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, |
1666 | lockdep_is_held(&rt6_exception_lock)); | |
35732d01 WW |
1667 | if (!bucket) { |
1668 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1669 | GFP_ATOMIC); | |
1670 | if (!bucket) { | |
1671 | err = -ENOMEM; | |
1672 | goto out; | |
1673 | } | |
cc5c073a DA |
1674 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); |
1675 | } else if (fib6_nh_excptn_bucket_flushed(bucket)) { | |
1676 | err = -EINVAL; | |
1677 | goto out; | |
35732d01 WW |
1678 | } |
1679 | ||
1680 | #ifdef CONFIG_IPV6_SUBTREES | |
5012f0a5 | 1681 | /* fib6_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1682 | * and exception table is indexed by a hash of |
5012f0a5 | 1683 | * both fib6_dst and fib6_src. |
35732d01 | 1684 | * Otherwise, the exception table is indexed by |
5012f0a5 | 1685 | * a hash of only fib6_dst. |
35732d01 | 1686 | */ |
5012f0a5 | 1687 | if (f6i->fib6_src.plen) |
35732d01 WW |
1688 | src_key = &nrt->rt6i_src.addr; |
1689 | #endif | |
5012f0a5 | 1690 | /* rt6_mtu_change() might lower mtu on f6i. |
f5bbe7ee | 1691 | * Only insert this exception route if its mtu |
5012f0a5 | 1692 | * is less than f6i's mtu value. |
f5bbe7ee | 1693 | */ |
b748f260 | 1694 | if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) { |
f5bbe7ee WW |
1695 | err = -EINVAL; |
1696 | goto out; | |
1697 | } | |
60006a48 | 1698 | |
35732d01 WW |
1699 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1700 | src_key); | |
1701 | if (rt6_ex) | |
1702 | rt6_remove_exception(bucket, rt6_ex); | |
1703 | ||
1704 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1705 | if (!rt6_ex) { | |
1706 | err = -ENOMEM; | |
1707 | goto out; | |
1708 | } | |
1709 | rt6_ex->rt6i = nrt; | |
1710 | rt6_ex->stamp = jiffies; | |
35732d01 WW |
1711 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); |
1712 | bucket->depth++; | |
81eb8447 | 1713 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 | 1714 | |
a00df2ca ED |
1715 | /* Randomize max depth to avoid some side channels attacks. */ |
1716 | max_depth = FIB6_MAX_DEPTH + prandom_u32_max(FIB6_MAX_DEPTH); | |
1717 | while (bucket->depth > max_depth) | |
35732d01 WW |
1718 | rt6_exception_remove_oldest(bucket); |
1719 | ||
1720 | out: | |
1721 | spin_unlock_bh(&rt6_exception_lock); | |
1722 | ||
1723 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1724 | if (!err) { |
5012f0a5 DA |
1725 | spin_lock_bh(&f6i->fib6_table->tb6_lock); |
1726 | fib6_update_sernum(net, f6i); | |
1727 | spin_unlock_bh(&f6i->fib6_table->tb6_lock); | |
b886d5f2 PA |
1728 | fib6_force_start_gc(net); |
1729 | } | |
35732d01 WW |
1730 | |
1731 | return err; | |
1732 | } | |
1733 | ||
c0b220cf | 1734 | static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from) |
35732d01 WW |
1735 | { |
1736 | struct rt6_exception_bucket *bucket; | |
1737 | struct rt6_exception *rt6_ex; | |
1738 | struct hlist_node *tmp; | |
1739 | int i; | |
1740 | ||
1741 | spin_lock_bh(&rt6_exception_lock); | |
35732d01 | 1742 | |
cc5c073a | 1743 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
35732d01 WW |
1744 | if (!bucket) |
1745 | goto out; | |
1746 | ||
cc5c073a DA |
1747 | /* Prevent rt6_insert_exception() to recreate the bucket list */ |
1748 | if (!from) | |
1749 | fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock); | |
1750 | ||
35732d01 | 1751 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { |
cc5c073a DA |
1752 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) { |
1753 | if (!from || | |
1754 | rcu_access_pointer(rt6_ex->rt6i->from) == from) | |
1755 | rt6_remove_exception(bucket, rt6_ex); | |
1756 | } | |
1757 | WARN_ON_ONCE(!from && bucket->depth); | |
35732d01 WW |
1758 | bucket++; |
1759 | } | |
35732d01 WW |
1760 | out: |
1761 | spin_unlock_bh(&rt6_exception_lock); | |
1762 | } | |
1763 | ||
e659ba31 DA |
1764 | static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg) |
1765 | { | |
1766 | struct fib6_info *f6i = arg; | |
1767 | ||
1768 | fib6_nh_flush_exceptions(nh, f6i); | |
1769 | ||
1770 | return 0; | |
1771 | } | |
1772 | ||
c0b220cf DA |
1773 | void rt6_flush_exceptions(struct fib6_info *f6i) |
1774 | { | |
e659ba31 DA |
1775 | if (f6i->nh) |
1776 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions, | |
1777 | f6i); | |
1778 | else | |
1779 | fib6_nh_flush_exceptions(f6i->fib6_nh, f6i); | |
c0b220cf DA |
1780 | } |
1781 | ||
35732d01 WW |
1782 | /* Find cached rt in the hash table inside passed in rt |
1783 | * Caller has to hold rcu_read_lock() | |
1784 | */ | |
7e4b5128 | 1785 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
1786 | const struct in6_addr *daddr, |
1787 | const struct in6_addr *saddr) | |
35732d01 | 1788 | { |
510e2ced | 1789 | const struct in6_addr *src_key = NULL; |
35732d01 | 1790 | struct rt6_exception_bucket *bucket; |
35732d01 | 1791 | struct rt6_exception *rt6_ex; |
7e4b5128 | 1792 | struct rt6_info *ret = NULL; |
35732d01 | 1793 | |
35732d01 | 1794 | #ifdef CONFIG_IPV6_SUBTREES |
7e4b5128 | 1795 | /* fib6i_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1796 | * and exception table is indexed by a hash of |
7e4b5128 | 1797 | * both fib6_dst and fib6_src. |
510e2ced WW |
1798 | * However, the src addr used to create the hash |
1799 | * might not be exactly the passed in saddr which | |
1800 | * is a /128 addr from the flow. | |
1801 | * So we need to use f6i->fib6_src to redo lookup | |
1802 | * if the passed in saddr does not find anything. | |
1803 | * (See the logic in ip6_rt_cache_alloc() on how | |
1804 | * rt->rt6i_src is updated.) | |
35732d01 | 1805 | */ |
7e4b5128 | 1806 | if (res->f6i->fib6_src.plen) |
35732d01 | 1807 | src_key = saddr; |
510e2ced | 1808 | find_ex: |
35732d01 | 1809 | #endif |
cc5c073a | 1810 | bucket = fib6_nh_get_excptn_bucket(res->nh, NULL); |
35732d01 WW |
1811 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); |
1812 | ||
1813 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
7e4b5128 | 1814 | ret = rt6_ex->rt6i; |
35732d01 | 1815 | |
510e2ced WW |
1816 | #ifdef CONFIG_IPV6_SUBTREES |
1817 | /* Use fib6_src as src_key and redo lookup */ | |
1818 | if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) { | |
1819 | src_key = &res->f6i->fib6_src.addr; | |
1820 | goto find_ex; | |
1821 | } | |
1822 | #endif | |
1823 | ||
7e4b5128 | 1824 | return ret; |
35732d01 WW |
1825 | } |
1826 | ||
1827 | /* Remove the passed in cached rt from the hash table that contains it */ | |
cc5c073a | 1828 | static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1829 | const struct rt6_info *rt) |
35732d01 | 1830 | { |
c0b220cf | 1831 | const struct in6_addr *src_key = NULL; |
35732d01 | 1832 | struct rt6_exception_bucket *bucket; |
35732d01 WW |
1833 | struct rt6_exception *rt6_ex; |
1834 | int err; | |
1835 | ||
cc5c073a | 1836 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
35732d01 WW |
1837 | return -ENOENT; |
1838 | ||
1839 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a DA |
1840 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
1841 | ||
35732d01 | 1842 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1843 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1844 | * and exception table is indexed by a hash of | |
1845 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1846 | * Otherwise, the exception table is indexed by |
1847 | * a hash of only rt6i_dst. | |
1848 | */ | |
c0b220cf | 1849 | if (plen) |
35732d01 WW |
1850 | src_key = &rt->rt6i_src.addr; |
1851 | #endif | |
1852 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1853 | &rt->rt6i_dst.addr, | |
1854 | src_key); | |
1855 | if (rt6_ex) { | |
1856 | rt6_remove_exception(bucket, rt6_ex); | |
1857 | err = 0; | |
1858 | } else { | |
1859 | err = -ENOENT; | |
1860 | } | |
1861 | ||
1862 | spin_unlock_bh(&rt6_exception_lock); | |
1863 | return err; | |
1864 | } | |
1865 | ||
e659ba31 DA |
1866 | struct fib6_nh_excptn_arg { |
1867 | struct rt6_info *rt; | |
1868 | int plen; | |
1869 | }; | |
1870 | ||
1871 | static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg) | |
1872 | { | |
1873 | struct fib6_nh_excptn_arg *arg = _arg; | |
1874 | int err; | |
1875 | ||
1876 | err = fib6_nh_remove_exception(nh, arg->plen, arg->rt); | |
1877 | if (err == 0) | |
1878 | return 1; | |
1879 | ||
1880 | return 0; | |
1881 | } | |
1882 | ||
c0b220cf DA |
1883 | static int rt6_remove_exception_rt(struct rt6_info *rt) |
1884 | { | |
1885 | struct fib6_info *from; | |
1886 | ||
1887 | from = rcu_dereference(rt->from); | |
cc5c073a | 1888 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) |
c0b220cf DA |
1889 | return -EINVAL; |
1890 | ||
e659ba31 DA |
1891 | if (from->nh) { |
1892 | struct fib6_nh_excptn_arg arg = { | |
1893 | .rt = rt, | |
1894 | .plen = from->fib6_src.plen | |
1895 | }; | |
1896 | int rc; | |
1897 | ||
1898 | /* rc = 1 means an entry was found */ | |
1899 | rc = nexthop_for_each_fib6_nh(from->nh, | |
1900 | rt6_nh_remove_exception_rt, | |
1901 | &arg); | |
1902 | return rc ? 0 : -ENOENT; | |
1903 | } | |
1904 | ||
1cf844c7 | 1905 | return fib6_nh_remove_exception(from->fib6_nh, |
cc5c073a | 1906 | from->fib6_src.plen, rt); |
c0b220cf DA |
1907 | } |
1908 | ||
35732d01 WW |
1909 | /* Find rt6_ex which contains the passed in rt cache and |
1910 | * refresh its stamp | |
1911 | */ | |
cc5c073a | 1912 | static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1913 | const struct rt6_info *rt) |
35732d01 | 1914 | { |
c0b220cf | 1915 | const struct in6_addr *src_key = NULL; |
35732d01 | 1916 | struct rt6_exception_bucket *bucket; |
35732d01 | 1917 | struct rt6_exception *rt6_ex; |
193f3685 | 1918 | |
cc5c073a | 1919 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); |
35732d01 | 1920 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1921 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1922 | * and exception table is indexed by a hash of | |
1923 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1924 | * Otherwise, the exception table is indexed by |
1925 | * a hash of only rt6i_dst. | |
1926 | */ | |
c0b220cf | 1927 | if (plen) |
35732d01 WW |
1928 | src_key = &rt->rt6i_src.addr; |
1929 | #endif | |
cc5c073a | 1930 | rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key); |
35732d01 WW |
1931 | if (rt6_ex) |
1932 | rt6_ex->stamp = jiffies; | |
c0b220cf DA |
1933 | } |
1934 | ||
e659ba31 DA |
1935 | struct fib6_nh_match_arg { |
1936 | const struct net_device *dev; | |
1937 | const struct in6_addr *gw; | |
1938 | struct fib6_nh *match; | |
1939 | }; | |
1940 | ||
1941 | /* determine if fib6_nh has given device and gateway */ | |
1942 | static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
1943 | { | |
1944 | struct fib6_nh_match_arg *arg = _arg; | |
1945 | ||
1946 | if (arg->dev != nh->fib_nh_dev || | |
1947 | (arg->gw && !nh->fib_nh_gw_family) || | |
1948 | (!arg->gw && nh->fib_nh_gw_family) || | |
1949 | (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6))) | |
1950 | return 0; | |
1951 | ||
1952 | arg->match = nh; | |
1953 | ||
1954 | /* found a match, break the loop */ | |
1955 | return 1; | |
1956 | } | |
1957 | ||
c0b220cf DA |
1958 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) |
1959 | { | |
1960 | struct fib6_info *from; | |
e659ba31 | 1961 | struct fib6_nh *fib6_nh; |
35732d01 | 1962 | |
c0b220cf DA |
1963 | rcu_read_lock(); |
1964 | ||
1965 | from = rcu_dereference(rt->from); | |
1966 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) | |
1967 | goto unlock; | |
1968 | ||
e659ba31 DA |
1969 | if (from->nh) { |
1970 | struct fib6_nh_match_arg arg = { | |
1971 | .dev = rt->dst.dev, | |
1972 | .gw = &rt->rt6i_gateway, | |
1973 | }; | |
1974 | ||
1975 | nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg); | |
1976 | ||
1977 | if (!arg.match) | |
cff6a327 | 1978 | goto unlock; |
e659ba31 DA |
1979 | fib6_nh = arg.match; |
1980 | } else { | |
1981 | fib6_nh = from->fib6_nh; | |
1982 | } | |
1983 | fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt); | |
193f3685 | 1984 | unlock: |
35732d01 WW |
1985 | rcu_read_unlock(); |
1986 | } | |
1987 | ||
e9fa1495 SB |
1988 | static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev, |
1989 | struct rt6_info *rt, int mtu) | |
1990 | { | |
1991 | /* If the new MTU is lower than the route PMTU, this new MTU will be the | |
1992 | * lowest MTU in the path: always allow updating the route PMTU to | |
1993 | * reflect PMTU decreases. | |
1994 | * | |
1995 | * If the new MTU is higher, and the route PMTU is equal to the local | |
1996 | * MTU, this means the old MTU is the lowest in the path, so allow | |
1997 | * updating it: if other nodes now have lower MTUs, PMTU discovery will | |
1998 | * handle this. | |
1999 | */ | |
2000 | ||
2001 | if (dst_mtu(&rt->dst) >= mtu) | |
2002 | return true; | |
2003 | ||
2004 | if (dst_mtu(&rt->dst) == idev->cnf.mtu6) | |
2005 | return true; | |
2006 | ||
2007 | return false; | |
2008 | } | |
2009 | ||
2010 | static void rt6_exceptions_update_pmtu(struct inet6_dev *idev, | |
cc5c073a | 2011 | const struct fib6_nh *nh, int mtu) |
f5bbe7ee WW |
2012 | { |
2013 | struct rt6_exception_bucket *bucket; | |
2014 | struct rt6_exception *rt6_ex; | |
2015 | int i; | |
2016 | ||
cc5c073a | 2017 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
e9fa1495 SB |
2018 | if (!bucket) |
2019 | return; | |
2020 | ||
2021 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2022 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
2023 | struct rt6_info *entry = rt6_ex->rt6i; | |
2024 | ||
2025 | /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected | |
d4ead6b3 | 2026 | * route), the metrics of its rt->from have already |
e9fa1495 SB |
2027 | * been updated. |
2028 | */ | |
d4ead6b3 | 2029 | if (dst_metric_raw(&entry->dst, RTAX_MTU) && |
e9fa1495 | 2030 | rt6_mtu_change_route_allowed(idev, entry, mtu)) |
d4ead6b3 | 2031 | dst_metric_set(&entry->dst, RTAX_MTU, mtu); |
f5bbe7ee | 2032 | } |
e9fa1495 | 2033 | bucket++; |
f5bbe7ee WW |
2034 | } |
2035 | } | |
2036 | ||
b16cb459 WW |
2037 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
2038 | ||
cc5c073a DA |
2039 | static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh, |
2040 | const struct in6_addr *gateway) | |
b16cb459 WW |
2041 | { |
2042 | struct rt6_exception_bucket *bucket; | |
2043 | struct rt6_exception *rt6_ex; | |
2044 | struct hlist_node *tmp; | |
2045 | int i; | |
2046 | ||
cc5c073a | 2047 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
b16cb459 WW |
2048 | return; |
2049 | ||
2050 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 2051 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
b16cb459 WW |
2052 | if (bucket) { |
2053 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2054 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2055 | &bucket->chain, hlist) { | |
2056 | struct rt6_info *entry = rt6_ex->rt6i; | |
2057 | ||
2058 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
2059 | RTF_CACHE_GATEWAY && | |
2060 | ipv6_addr_equal(gateway, | |
2061 | &entry->rt6i_gateway)) { | |
2062 | rt6_remove_exception(bucket, rt6_ex); | |
2063 | } | |
2064 | } | |
2065 | bucket++; | |
2066 | } | |
2067 | } | |
2068 | ||
2069 | spin_unlock_bh(&rt6_exception_lock); | |
2070 | } | |
2071 | ||
c757faa8 WW |
2072 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
2073 | struct rt6_exception *rt6_ex, | |
2074 | struct fib6_gc_args *gc_args, | |
2075 | unsigned long now) | |
2076 | { | |
2077 | struct rt6_info *rt = rt6_ex->rt6i; | |
2078 | ||
1859bac0 PA |
2079 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
2080 | * even if others have still references to them, so that on next | |
2081 | * dst_check() such references can be dropped. | |
2082 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
2083 | * expired, independently from their aging, as per RFC 8201 section 4 | |
2084 | */ | |
31afeb42 WW |
2085 | if (!(rt->rt6i_flags & RTF_EXPIRES)) { |
2086 | if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { | |
2087 | RT6_TRACE("aging clone %p\n", rt); | |
2088 | rt6_remove_exception(bucket, rt6_ex); | |
2089 | return; | |
2090 | } | |
2091 | } else if (time_after(jiffies, rt->dst.expires)) { | |
2092 | RT6_TRACE("purging expired route %p\n", rt); | |
c757faa8 WW |
2093 | rt6_remove_exception(bucket, rt6_ex); |
2094 | return; | |
31afeb42 WW |
2095 | } |
2096 | ||
2097 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
c757faa8 | 2098 | struct neighbour *neigh; |
c757faa8 | 2099 | |
1bfa26ff | 2100 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
1bfa26ff | 2101 | |
b7a320c3 | 2102 | if (!(neigh && (neigh->flags & NTF_ROUTER))) { |
c757faa8 WW |
2103 | RT6_TRACE("purging route %p via non-router but gateway\n", |
2104 | rt); | |
2105 | rt6_remove_exception(bucket, rt6_ex); | |
2106 | return; | |
2107 | } | |
2108 | } | |
31afeb42 | 2109 | |
c757faa8 WW |
2110 | gc_args->more++; |
2111 | } | |
2112 | ||
cc5c073a | 2113 | static void fib6_nh_age_exceptions(const struct fib6_nh *nh, |
c0b220cf DA |
2114 | struct fib6_gc_args *gc_args, |
2115 | unsigned long now) | |
c757faa8 WW |
2116 | { |
2117 | struct rt6_exception_bucket *bucket; | |
2118 | struct rt6_exception *rt6_ex; | |
2119 | struct hlist_node *tmp; | |
2120 | int i; | |
2121 | ||
cc5c073a | 2122 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
c757faa8 WW |
2123 | return; |
2124 | ||
1bfa26ff ED |
2125 | rcu_read_lock_bh(); |
2126 | spin_lock(&rt6_exception_lock); | |
cc5c073a | 2127 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
c757faa8 WW |
2128 | if (bucket) { |
2129 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2130 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2131 | &bucket->chain, hlist) { | |
2132 | rt6_age_examine_exception(bucket, rt6_ex, | |
2133 | gc_args, now); | |
2134 | } | |
2135 | bucket++; | |
2136 | } | |
2137 | } | |
1bfa26ff ED |
2138 | spin_unlock(&rt6_exception_lock); |
2139 | rcu_read_unlock_bh(); | |
c757faa8 WW |
2140 | } |
2141 | ||
e659ba31 DA |
2142 | struct fib6_nh_age_excptn_arg { |
2143 | struct fib6_gc_args *gc_args; | |
2144 | unsigned long now; | |
2145 | }; | |
2146 | ||
2147 | static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg) | |
2148 | { | |
2149 | struct fib6_nh_age_excptn_arg *arg = _arg; | |
2150 | ||
2151 | fib6_nh_age_exceptions(nh, arg->gc_args, arg->now); | |
2152 | return 0; | |
2153 | } | |
2154 | ||
cc5c073a | 2155 | void rt6_age_exceptions(struct fib6_info *f6i, |
c0b220cf DA |
2156 | struct fib6_gc_args *gc_args, |
2157 | unsigned long now) | |
2158 | { | |
e659ba31 DA |
2159 | if (f6i->nh) { |
2160 | struct fib6_nh_age_excptn_arg arg = { | |
2161 | .gc_args = gc_args, | |
2162 | .now = now | |
2163 | }; | |
2164 | ||
2165 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions, | |
2166 | &arg); | |
2167 | } else { | |
2168 | fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now); | |
2169 | } | |
c0b220cf DA |
2170 | } |
2171 | ||
1d053da9 | 2172 | /* must be called with rcu lock held */ |
effda4dd DA |
2173 | int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif, |
2174 | struct flowi6 *fl6, struct fib6_result *res, int strict) | |
1da177e4 | 2175 | { |
367efcb9 | 2176 | struct fib6_node *fn, *saved_fn; |
1da177e4 | 2177 | |
6454743b | 2178 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 2179 | saved_fn = fn; |
1da177e4 | 2180 | |
ca254490 DA |
2181 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
2182 | oif = 0; | |
2183 | ||
a3c00e46 | 2184 | redo_rt6_select: |
effda4dd DA |
2185 | rt6_select(net, fn, oif, res, strict); |
2186 | if (res->f6i == net->ipv6.fib6_null_entry) { | |
a3c00e46 MKL |
2187 | fn = fib6_backtrack(fn, &fl6->saddr); |
2188 | if (fn) | |
2189 | goto redo_rt6_select; | |
367efcb9 MKL |
2190 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
2191 | /* also consider unreachable route */ | |
2192 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
2193 | fn = saved_fn; | |
2194 | goto redo_rt6_select; | |
367efcb9 | 2195 | } |
a3c00e46 MKL |
2196 | } |
2197 | ||
effda4dd | 2198 | trace_fib6_table_lookup(net, res, table, fl6); |
fb9de91e | 2199 | |
effda4dd | 2200 | return 0; |
1d053da9 DA |
2201 | } |
2202 | ||
2203 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, | |
2204 | int oif, struct flowi6 *fl6, | |
2205 | const struct sk_buff *skb, int flags) | |
2206 | { | |
b1d40991 | 2207 | struct fib6_result res = {}; |
0e09edcc | 2208 | struct rt6_info *rt = NULL; |
1d053da9 DA |
2209 | int strict = 0; |
2210 | ||
0e09edcc WW |
2211 | WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) && |
2212 | !rcu_read_lock_held()); | |
2213 | ||
1d053da9 DA |
2214 | strict |= flags & RT6_LOOKUP_F_IFACE; |
2215 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; | |
2216 | if (net->ipv6.devconf_all->forwarding == 0) | |
2217 | strict |= RT6_LOOKUP_F_REACHABLE; | |
2218 | ||
2219 | rcu_read_lock(); | |
2220 | ||
effda4dd | 2221 | fib6_table_lookup(net, table, oif, fl6, &res, strict); |
0e09edcc WW |
2222 | if (res.f6i == net->ipv6.fib6_null_entry) |
2223 | goto out; | |
23fb93a4 | 2224 | |
b1d40991 | 2225 | fib6_select_path(net, &res, fl6, oif, false, skb, strict); |
d83009d4 | 2226 | |
23fb93a4 | 2227 | /*Search through exception table */ |
7e4b5128 | 2228 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 2229 | if (rt) { |
0e09edcc | 2230 | goto out; |
3da59bd9 | 2231 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
b1d40991 | 2232 | !res.nh->fib_nh_gw_family)) { |
3da59bd9 MKL |
2233 | /* Create a RTF_CACHE clone which will not be |
2234 | * owned by the fib6 tree. It is for the special case where | |
2235 | * the daddr in the skb during the neighbor look-up is different | |
2236 | * from the fl6->daddr used to look-up route here. | |
2237 | */ | |
0e09edcc | 2238 | rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL); |
c71099ac | 2239 | |
0e09edcc WW |
2240 | if (rt) { |
2241 | /* 1 refcnt is taken during ip6_rt_cache_alloc(). | |
2242 | * As rt6_uncached_list_add() does not consume refcnt, | |
2243 | * this refcnt is always returned to the caller even | |
2244 | * if caller sets RT6_LOOKUP_F_DST_NOREF flag. | |
1cfb71ee | 2245 | */ |
0e09edcc | 2246 | rt6_uncached_list_add(rt); |
81eb8447 | 2247 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
0e09edcc | 2248 | rcu_read_unlock(); |
b811580d | 2249 | |
0e09edcc WW |
2250 | return rt; |
2251 | } | |
d52d3997 MKL |
2252 | } else { |
2253 | /* Get a percpu copy */ | |
951f788a | 2254 | local_bh_disable(); |
0e09edcc | 2255 | rt = rt6_get_pcpu_route(&res); |
d52d3997 | 2256 | |
0e09edcc WW |
2257 | if (!rt) |
2258 | rt = rt6_make_pcpu_route(net, &res); | |
93531c67 | 2259 | |
951f788a | 2260 | local_bh_enable(); |
d52d3997 | 2261 | } |
0e09edcc WW |
2262 | out: |
2263 | if (!rt) | |
2264 | rt = net->ipv6.ip6_null_entry; | |
2265 | if (!(flags & RT6_LOOKUP_F_DST_NOREF)) | |
2266 | ip6_hold_safe(net, &rt); | |
2267 | rcu_read_unlock(); | |
2268 | ||
2269 | return rt; | |
1da177e4 | 2270 | } |
9ff74384 | 2271 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 2272 | |
55cced4f | 2273 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net, |
b75cc8f9 DA |
2274 | struct fib6_table *table, |
2275 | struct flowi6 *fl6, | |
2276 | const struct sk_buff *skb, | |
2277 | int flags) | |
4acad72d | 2278 | { |
b75cc8f9 | 2279 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags); |
4acad72d PE |
2280 | } |
2281 | ||
d409b847 MB |
2282 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
2283 | struct net_device *dev, | |
b75cc8f9 DA |
2284 | struct flowi6 *fl6, |
2285 | const struct sk_buff *skb, | |
2286 | int flags) | |
72331bc0 SL |
2287 | { |
2288 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
2289 | flags |= RT6_LOOKUP_F_IFACE; | |
2290 | ||
b75cc8f9 | 2291 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input); |
72331bc0 | 2292 | } |
d409b847 | 2293 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 2294 | |
23aebdac | 2295 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
5e5d6fed RP |
2296 | struct flow_keys *keys, |
2297 | struct flow_keys *flkeys) | |
23aebdac JS |
2298 | { |
2299 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
2300 | const struct ipv6hdr *key_iph = outer_iph; | |
5e5d6fed | 2301 | struct flow_keys *_flkeys = flkeys; |
23aebdac JS |
2302 | const struct ipv6hdr *inner_iph; |
2303 | const struct icmp6hdr *icmph; | |
2304 | struct ipv6hdr _inner_iph; | |
cea67a2d | 2305 | struct icmp6hdr _icmph; |
23aebdac JS |
2306 | |
2307 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
2308 | goto out; | |
2309 | ||
cea67a2d ED |
2310 | icmph = skb_header_pointer(skb, skb_transport_offset(skb), |
2311 | sizeof(_icmph), &_icmph); | |
2312 | if (!icmph) | |
2313 | goto out; | |
2314 | ||
54074f1d | 2315 | if (!icmpv6_is_err(icmph->icmp6_type)) |
23aebdac JS |
2316 | goto out; |
2317 | ||
2318 | inner_iph = skb_header_pointer(skb, | |
2319 | skb_transport_offset(skb) + sizeof(*icmph), | |
2320 | sizeof(_inner_iph), &_inner_iph); | |
2321 | if (!inner_iph) | |
2322 | goto out; | |
2323 | ||
2324 | key_iph = inner_iph; | |
5e5d6fed | 2325 | _flkeys = NULL; |
23aebdac | 2326 | out: |
5e5d6fed RP |
2327 | if (_flkeys) { |
2328 | keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src; | |
2329 | keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst; | |
2330 | keys->tags.flow_label = _flkeys->tags.flow_label; | |
2331 | keys->basic.ip_proto = _flkeys->basic.ip_proto; | |
2332 | } else { | |
2333 | keys->addrs.v6addrs.src = key_iph->saddr; | |
2334 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
fa1be7e0 | 2335 | keys->tags.flow_label = ip6_flowlabel(key_iph); |
5e5d6fed RP |
2336 | keys->basic.ip_proto = key_iph->nexthdr; |
2337 | } | |
23aebdac JS |
2338 | } |
2339 | ||
73c2c5cb IS |
2340 | static u32 rt6_multipath_custom_hash_outer(const struct net *net, |
2341 | const struct sk_buff *skb, | |
2342 | bool *p_has_inner) | |
2343 | { | |
2344 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2345 | struct flow_keys keys, hash_keys; | |
2346 | ||
2347 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK)) | |
2348 | return 0; | |
2349 | ||
2350 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2351 | skb_flow_dissect_flow_keys(skb, &keys, FLOW_DISSECTOR_F_STOP_AT_ENCAP); | |
2352 | ||
2353 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2354 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP) | |
2355 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
2356 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP) | |
2357 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
2358 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO) | |
2359 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
2360 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL) | |
2361 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
2362 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT) | |
2363 | hash_keys.ports.src = keys.ports.src; | |
2364 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT) | |
2365 | hash_keys.ports.dst = keys.ports.dst; | |
2366 | ||
2367 | *p_has_inner = !!(keys.control.flags & FLOW_DIS_ENCAPSULATION); | |
2368 | return flow_hash_from_keys(&hash_keys); | |
2369 | } | |
2370 | ||
2371 | static u32 rt6_multipath_custom_hash_inner(const struct net *net, | |
2372 | const struct sk_buff *skb, | |
2373 | bool has_inner) | |
2374 | { | |
2375 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2376 | struct flow_keys keys, hash_keys; | |
2377 | ||
2378 | /* We assume the packet carries an encapsulation, but if none was | |
2379 | * encountered during dissection of the outer flow, then there is no | |
2380 | * point in calling the flow dissector again. | |
2381 | */ | |
2382 | if (!has_inner) | |
2383 | return 0; | |
2384 | ||
2385 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_MASK)) | |
2386 | return 0; | |
2387 | ||
2388 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2389 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2390 | ||
2391 | if (!(keys.control.flags & FLOW_DIS_ENCAPSULATION)) | |
2392 | return 0; | |
2393 | ||
2394 | if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2395 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2396 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP) | |
2397 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; | |
2398 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP) | |
2399 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
2400 | } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2401 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2402 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP) | |
2403 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
2404 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP) | |
2405 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
2406 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL) | |
2407 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
2408 | } | |
2409 | ||
2410 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO) | |
2411 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
2412 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT) | |
2413 | hash_keys.ports.src = keys.ports.src; | |
2414 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT) | |
2415 | hash_keys.ports.dst = keys.ports.dst; | |
2416 | ||
2417 | return flow_hash_from_keys(&hash_keys); | |
2418 | } | |
2419 | ||
2420 | static u32 rt6_multipath_custom_hash_skb(const struct net *net, | |
2421 | const struct sk_buff *skb) | |
2422 | { | |
2423 | u32 mhash, mhash_inner; | |
2424 | bool has_inner = true; | |
2425 | ||
2426 | mhash = rt6_multipath_custom_hash_outer(net, skb, &has_inner); | |
2427 | mhash_inner = rt6_multipath_custom_hash_inner(net, skb, has_inner); | |
2428 | ||
2429 | return jhash_2words(mhash, mhash_inner, 0); | |
2430 | } | |
2431 | ||
2432 | static u32 rt6_multipath_custom_hash_fl6(const struct net *net, | |
2433 | const struct flowi6 *fl6) | |
2434 | { | |
2435 | u32 hash_fields = ip6_multipath_hash_fields(net); | |
2436 | struct flow_keys hash_keys; | |
2437 | ||
2438 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK)) | |
2439 | return 0; | |
2440 | ||
2441 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2442 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2443 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP) | |
2444 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2445 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP) | |
2446 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2447 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO) | |
2448 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2449 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL) | |
2450 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2451 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT) | |
2452 | hash_keys.ports.src = fl6->fl6_sport; | |
2453 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT) | |
2454 | hash_keys.ports.dst = fl6->fl6_dport; | |
2455 | ||
2456 | return flow_hash_from_keys(&hash_keys); | |
2457 | } | |
2458 | ||
23aebdac | 2459 | /* if skb is set it will be used and fl6 can be NULL */ |
b4bac172 DA |
2460 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
2461 | const struct sk_buff *skb, struct flow_keys *flkeys) | |
23aebdac JS |
2462 | { |
2463 | struct flow_keys hash_keys; | |
b95b6e07 | 2464 | u32 mhash = 0; |
23aebdac | 2465 | |
bbfa047a | 2466 | switch (ip6_multipath_hash_policy(net)) { |
b4bac172 DA |
2467 | case 0: |
2468 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2469 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2470 | if (skb) { | |
2471 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2472 | } else { | |
2473 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2474 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
fa1be7e0 | 2475 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
b4bac172 DA |
2476 | hash_keys.basic.ip_proto = fl6->flowi6_proto; |
2477 | } | |
b95b6e07 | 2478 | mhash = flow_hash_from_keys(&hash_keys); |
b4bac172 DA |
2479 | break; |
2480 | case 1: | |
2481 | if (skb) { | |
2482 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
2483 | struct flow_keys keys; | |
2484 | ||
2485 | /* short-circuit if we already have L4 hash present */ | |
2486 | if (skb->l4_hash) | |
2487 | return skb_get_hash_raw(skb) >> 1; | |
2488 | ||
2489 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2490 | ||
13fdb940 | 2491 | if (!flkeys) { |
b4bac172 DA |
2492 | skb_flow_dissect_flow_keys(skb, &keys, flag); |
2493 | flkeys = &keys; | |
2494 | } | |
2495 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2496 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2497 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2498 | hash_keys.ports.src = flkeys->ports.src; | |
2499 | hash_keys.ports.dst = flkeys->ports.dst; | |
2500 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2501 | } else { | |
2502 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2503 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2504 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2505 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2506 | hash_keys.ports.src = fl6->fl6_sport; | |
2507 | hash_keys.ports.dst = fl6->fl6_dport; | |
2508 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2509 | } | |
b95b6e07 | 2510 | mhash = flow_hash_from_keys(&hash_keys); |
b4bac172 | 2511 | break; |
d8f74f09 SS |
2512 | case 2: |
2513 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2514 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2515 | if (skb) { | |
2516 | struct flow_keys keys; | |
2517 | ||
2518 | if (!flkeys) { | |
2519 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2520 | flkeys = &keys; | |
2521 | } | |
2522 | ||
2523 | /* Inner can be v4 or v6 */ | |
2524 | if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2525 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2526 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
2527 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
2528 | } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2529 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2530 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2531 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2532 | hash_keys.tags.flow_label = flkeys->tags.flow_label; | |
2533 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2534 | } else { | |
2535 | /* Same as case 0 */ | |
2536 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2537 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2538 | } | |
2539 | } else { | |
2540 | /* Same as case 0 */ | |
2541 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2542 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2543 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2544 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2545 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2546 | } | |
b95b6e07 | 2547 | mhash = flow_hash_from_keys(&hash_keys); |
d8f74f09 | 2548 | break; |
73c2c5cb IS |
2549 | case 3: |
2550 | if (skb) | |
2551 | mhash = rt6_multipath_custom_hash_skb(net, skb); | |
2552 | else | |
2553 | mhash = rt6_multipath_custom_hash_fl6(net, fl6); | |
2554 | break; | |
23aebdac JS |
2555 | } |
2556 | ||
9a2a537a | 2557 | return mhash >> 1; |
23aebdac JS |
2558 | } |
2559 | ||
67f415dd | 2560 | /* Called with rcu held */ |
c71099ac TG |
2561 | void ip6_route_input(struct sk_buff *skb) |
2562 | { | |
b71d1d42 | 2563 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 2564 | struct net *net = dev_net(skb->dev); |
67f415dd | 2565 | int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF; |
904af04d | 2566 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 2567 | struct flowi6 fl6 = { |
e0d56fdd | 2568 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
2569 | .daddr = iph->daddr, |
2570 | .saddr = iph->saddr, | |
6502ca52 | 2571 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
2572 | .flowi6_mark = skb->mark, |
2573 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 2574 | }; |
5e5d6fed | 2575 | struct flow_keys *flkeys = NULL, _flkeys; |
adaa70bb | 2576 | |
904af04d | 2577 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2578 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 2579 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
5e5d6fed RP |
2580 | |
2581 | if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys)) | |
2582 | flkeys = &_flkeys; | |
2583 | ||
23aebdac | 2584 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
b4bac172 | 2585 | fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys); |
06e9d040 | 2586 | skb_dst_drop(skb); |
67f415dd WW |
2587 | skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev, |
2588 | &fl6, skb, flags)); | |
c71099ac TG |
2589 | } |
2590 | ||
55cced4f | 2591 | INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net, |
b75cc8f9 DA |
2592 | struct fib6_table *table, |
2593 | struct flowi6 *fl6, | |
2594 | const struct sk_buff *skb, | |
2595 | int flags) | |
1da177e4 | 2596 | { |
b75cc8f9 | 2597 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags); |
c71099ac TG |
2598 | } |
2599 | ||
7d9e5f42 WW |
2600 | struct dst_entry *ip6_route_output_flags_noref(struct net *net, |
2601 | const struct sock *sk, | |
2602 | struct flowi6 *fl6, int flags) | |
c71099ac | 2603 | { |
d46a9d67 | 2604 | bool any_src; |
c71099ac | 2605 | |
3ede0bbc RS |
2606 | if (ipv6_addr_type(&fl6->daddr) & |
2607 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) { | |
4c1feac5 DA |
2608 | struct dst_entry *dst; |
2609 | ||
7d9e5f42 | 2610 | /* This function does not take refcnt on the dst */ |
4c1feac5 DA |
2611 | dst = l3mdev_link_scope_lookup(net, fl6); |
2612 | if (dst) | |
2613 | return dst; | |
2614 | } | |
ca254490 | 2615 | |
1fb9489b | 2616 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 2617 | |
7d9e5f42 | 2618 | flags |= RT6_LOOKUP_F_DST_NOREF; |
d46a9d67 | 2619 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 2620 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 2621 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 2622 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 2623 | |
d46a9d67 | 2624 | if (!any_src) |
adaa70bb | 2625 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
2626 | else if (sk) |
2627 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 2628 | |
b75cc8f9 | 2629 | return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output); |
1da177e4 | 2630 | } |
7d9e5f42 WW |
2631 | EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref); |
2632 | ||
2633 | struct dst_entry *ip6_route_output_flags(struct net *net, | |
2634 | const struct sock *sk, | |
2635 | struct flowi6 *fl6, | |
2636 | int flags) | |
2637 | { | |
13fdb940 SK |
2638 | struct dst_entry *dst; |
2639 | struct rt6_info *rt6; | |
7d9e5f42 | 2640 | |
13fdb940 SK |
2641 | rcu_read_lock(); |
2642 | dst = ip6_route_output_flags_noref(net, sk, fl6, flags); | |
2643 | rt6 = (struct rt6_info *)dst; | |
2644 | /* For dst cached in uncached_list, refcnt is already taken. */ | |
2645 | if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) { | |
2646 | dst = &net->ipv6.ip6_null_entry->dst; | |
2647 | dst_hold(dst); | |
2648 | } | |
2649 | rcu_read_unlock(); | |
7d9e5f42 | 2650 | |
13fdb940 | 2651 | return dst; |
7d9e5f42 | 2652 | } |
6f21c96a | 2653 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 2654 | |
2774c131 | 2655 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2656 | { |
5c1e6aa3 | 2657 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
1dbe3252 | 2658 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
2659 | struct dst_entry *new = NULL; |
2660 | ||
1dbe3252 | 2661 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1, |
62cf27e5 | 2662 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2663 | if (rt) { |
0a1f5962 | 2664 | rt6_info_init(rt); |
81eb8447 | 2665 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 2666 | |
0a1f5962 | 2667 | new = &rt->dst; |
14e50e57 | 2668 | new->__use = 1; |
352e512c | 2669 | new->input = dst_discard; |
ede2059d | 2670 | new->output = dst_discard_out; |
14e50e57 | 2671 | |
0a1f5962 | 2672 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 2673 | |
1dbe3252 | 2674 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 2675 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 2676 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
2677 | |
2678 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
2679 | #ifdef CONFIG_IPV6_SUBTREES | |
2680 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
2681 | #endif | |
14e50e57 DM |
2682 | } |
2683 | ||
69ead7af DM |
2684 | dst_release(dst_orig); |
2685 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 2686 | } |
14e50e57 | 2687 | |
1da177e4 LT |
2688 | /* |
2689 | * Destination cache support functions | |
2690 | */ | |
2691 | ||
8d1c802b | 2692 | static bool fib6_check(struct fib6_info *f6i, u32 cookie) |
4b32b5ad | 2693 | { |
93531c67 DA |
2694 | u32 rt_cookie = 0; |
2695 | ||
8ae86971 | 2696 | if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie) |
93531c67 DA |
2697 | return false; |
2698 | ||
2699 | if (fib6_check_expired(f6i)) | |
2700 | return false; | |
2701 | ||
2702 | return true; | |
4b32b5ad MKL |
2703 | } |
2704 | ||
a68886a6 DA |
2705 | static struct dst_entry *rt6_check(struct rt6_info *rt, |
2706 | struct fib6_info *from, | |
2707 | u32 cookie) | |
3da59bd9 | 2708 | { |
36143645 | 2709 | u32 rt_cookie = 0; |
c5cff856 | 2710 | |
49d05fe2 | 2711 | if (!from || !fib6_get_cookie_safe(from, &rt_cookie) || |
93531c67 | 2712 | rt_cookie != cookie) |
3da59bd9 MKL |
2713 | return NULL; |
2714 | ||
2715 | if (rt6_check_expired(rt)) | |
2716 | return NULL; | |
2717 | ||
2718 | return &rt->dst; | |
2719 | } | |
2720 | ||
a68886a6 DA |
2721 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, |
2722 | struct fib6_info *from, | |
2723 | u32 cookie) | |
3da59bd9 | 2724 | { |
5973fb1e MKL |
2725 | if (!__rt6_check_expired(rt) && |
2726 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
a68886a6 | 2727 | fib6_check(from, cookie)) |
3da59bd9 MKL |
2728 | return &rt->dst; |
2729 | else | |
2730 | return NULL; | |
2731 | } | |
2732 | ||
bbd807df BV |
2733 | INDIRECT_CALLABLE_SCOPE struct dst_entry *ip6_dst_check(struct dst_entry *dst, |
2734 | u32 cookie) | |
1da177e4 | 2735 | { |
a87b7dc9 | 2736 | struct dst_entry *dst_ret; |
a68886a6 | 2737 | struct fib6_info *from; |
1da177e4 LT |
2738 | struct rt6_info *rt; |
2739 | ||
a87b7dc9 DA |
2740 | rt = container_of(dst, struct rt6_info, dst); |
2741 | ||
8f34e53b DA |
2742 | if (rt->sernum) |
2743 | return rt6_is_valid(rt) ? dst : NULL; | |
2744 | ||
a87b7dc9 | 2745 | rcu_read_lock(); |
1da177e4 | 2746 | |
6f3118b5 ND |
2747 | /* All IPV6 dsts are created with ->obsolete set to the value |
2748 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
2749 | * into this function always. | |
2750 | */ | |
e3bc10bd | 2751 | |
a68886a6 | 2752 | from = rcu_dereference(rt->from); |
4b32b5ad | 2753 | |
a68886a6 DA |
2754 | if (from && (rt->rt6i_flags & RTF_PCPU || |
2755 | unlikely(!list_empty(&rt->rt6i_uncached)))) | |
2756 | dst_ret = rt6_dst_from_check(rt, from, cookie); | |
3da59bd9 | 2757 | else |
a68886a6 | 2758 | dst_ret = rt6_check(rt, from, cookie); |
a87b7dc9 DA |
2759 | |
2760 | rcu_read_unlock(); | |
2761 | ||
2762 | return dst_ret; | |
1da177e4 | 2763 | } |
9c97921a | 2764 | EXPORT_INDIRECT_CALLABLE(ip6_dst_check); |
1da177e4 LT |
2765 | |
2766 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
2767 | { | |
2768 | struct rt6_info *rt = (struct rt6_info *) dst; | |
2769 | ||
2770 | if (rt) { | |
54c1a859 | 2771 | if (rt->rt6i_flags & RTF_CACHE) { |
c3c14da0 | 2772 | rcu_read_lock(); |
54c1a859 | 2773 | if (rt6_check_expired(rt)) { |
93531c67 | 2774 | rt6_remove_exception_rt(rt); |
54c1a859 YH |
2775 | dst = NULL; |
2776 | } | |
c3c14da0 | 2777 | rcu_read_unlock(); |
54c1a859 | 2778 | } else { |
1da177e4 | 2779 | dst_release(dst); |
54c1a859 YH |
2780 | dst = NULL; |
2781 | } | |
1da177e4 | 2782 | } |
54c1a859 | 2783 | return dst; |
1da177e4 LT |
2784 | } |
2785 | ||
2786 | static void ip6_link_failure(struct sk_buff *skb) | |
2787 | { | |
2788 | struct rt6_info *rt; | |
2789 | ||
3ffe533c | 2790 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2791 | |
adf30907 | 2792 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 2793 | if (rt) { |
8a14e46f | 2794 | rcu_read_lock(); |
1eb4f758 | 2795 | if (rt->rt6i_flags & RTF_CACHE) { |
761f6026 | 2796 | rt6_remove_exception_rt(rt); |
c5cff856 | 2797 | } else { |
a68886a6 | 2798 | struct fib6_info *from; |
c5cff856 WW |
2799 | struct fib6_node *fn; |
2800 | ||
a68886a6 DA |
2801 | from = rcu_dereference(rt->from); |
2802 | if (from) { | |
2803 | fn = rcu_dereference(from->fib6_node); | |
2804 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
a90dbf13 | 2805 | WRITE_ONCE(fn->fn_sernum, -1); |
a68886a6 | 2806 | } |
1eb4f758 | 2807 | } |
8a14e46f | 2808 | rcu_read_unlock(); |
1da177e4 LT |
2809 | } |
2810 | } | |
2811 | ||
6a3e030f DA |
2812 | static void rt6_update_expires(struct rt6_info *rt0, int timeout) |
2813 | { | |
a68886a6 DA |
2814 | if (!(rt0->rt6i_flags & RTF_EXPIRES)) { |
2815 | struct fib6_info *from; | |
2816 | ||
2817 | rcu_read_lock(); | |
2818 | from = rcu_dereference(rt0->from); | |
2819 | if (from) | |
2820 | rt0->dst.expires = from->expires; | |
2821 | rcu_read_unlock(); | |
2822 | } | |
6a3e030f DA |
2823 | |
2824 | dst_set_expires(&rt0->dst, timeout); | |
2825 | rt0->rt6i_flags |= RTF_EXPIRES; | |
2826 | } | |
2827 | ||
45e4fd26 MKL |
2828 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2829 | { | |
2830 | struct net *net = dev_net(rt->dst.dev); | |
2831 | ||
d4ead6b3 | 2832 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
45e4fd26 | 2833 | rt->rt6i_flags |= RTF_MODIFIED; |
45e4fd26 MKL |
2834 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
2835 | } | |
2836 | ||
0d3f6d29 MKL |
2837 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2838 | { | |
2839 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1490ed2a | 2840 | (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from)); |
0d3f6d29 MKL |
2841 | } |
2842 | ||
45e4fd26 | 2843 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
bd085ef6 HL |
2844 | const struct ipv6hdr *iph, u32 mtu, |
2845 | bool confirm_neigh) | |
1da177e4 | 2846 | { |
0dec879f | 2847 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 2848 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 2849 | |
09454fd0 MŻ |
2850 | /* Note: do *NOT* check dst_metric_locked(dst, RTAX_MTU) |
2851 | * IPv6 pmtu discovery isn't optional, so 'mtu lock' cannot disable it. | |
2852 | * [see also comment in rt6_mtu_change_route()] | |
2853 | */ | |
19bda36c | 2854 | |
0dec879f JA |
2855 | if (iph) { |
2856 | daddr = &iph->daddr; | |
2857 | saddr = &iph->saddr; | |
2858 | } else if (sk) { | |
2859 | daddr = &sk->sk_v6_daddr; | |
2860 | saddr = &inet6_sk(sk)->saddr; | |
2861 | } else { | |
2862 | daddr = NULL; | |
2863 | saddr = NULL; | |
2864 | } | |
bd085ef6 HL |
2865 | |
2866 | if (confirm_neigh) | |
2867 | dst_confirm_neigh(dst, daddr); | |
2868 | ||
4a65dff8 GK |
2869 | if (mtu < IPV6_MIN_MTU) |
2870 | return; | |
45e4fd26 MKL |
2871 | if (mtu >= dst_mtu(dst)) |
2872 | return; | |
9d289715 | 2873 | |
0d3f6d29 | 2874 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2875 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2876 | /* update rt6_ex->stamp for cache */ |
2877 | if (rt6->rt6i_flags & RTF_CACHE) | |
2878 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2879 | } else if (daddr) { |
85bd05de | 2880 | struct fib6_result res = {}; |
45e4fd26 MKL |
2881 | struct rt6_info *nrt6; |
2882 | ||
4d85cd0c | 2883 | rcu_read_lock(); |
85bd05de | 2884 | res.f6i = rcu_dereference(rt6->from); |
43a4b60d DA |
2885 | if (!res.f6i) |
2886 | goto out_unlock; | |
2887 | ||
7d21fec9 DA |
2888 | res.fib6_flags = res.f6i->fib6_flags; |
2889 | res.fib6_type = res.f6i->fib6_type; | |
2890 | ||
2d44234b DA |
2891 | if (res.f6i->nh) { |
2892 | struct fib6_nh_match_arg arg = { | |
2893 | .dev = dst->dev, | |
2894 | .gw = &rt6->rt6i_gateway, | |
2895 | }; | |
2896 | ||
2897 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
2898 | fib6_nh_find_match, &arg); | |
2899 | ||
2900 | /* fib6_info uses a nexthop that does not have fib6_nh | |
2901 | * using the dst->dev + gw. Should be impossible. | |
2902 | */ | |
43a4b60d DA |
2903 | if (!arg.match) |
2904 | goto out_unlock; | |
2d44234b DA |
2905 | |
2906 | res.nh = arg.match; | |
2907 | } else { | |
2908 | res.nh = res.f6i->fib6_nh; | |
2909 | } | |
2910 | ||
85bd05de | 2911 | nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr); |
45e4fd26 MKL |
2912 | if (nrt6) { |
2913 | rt6_do_update_pmtu(nrt6, mtu); | |
5012f0a5 | 2914 | if (rt6_insert_exception(nrt6, &res)) |
2b760fcf | 2915 | dst_release_immediate(&nrt6->dst); |
45e4fd26 | 2916 | } |
43a4b60d | 2917 | out_unlock: |
a68886a6 | 2918 | rcu_read_unlock(); |
1da177e4 LT |
2919 | } |
2920 | } | |
2921 | ||
45e4fd26 | 2922 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
2923 | struct sk_buff *skb, u32 mtu, |
2924 | bool confirm_neigh) | |
45e4fd26 | 2925 | { |
bd085ef6 HL |
2926 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu, |
2927 | confirm_neigh); | |
45e4fd26 MKL |
2928 | } |
2929 | ||
42ae66c8 | 2930 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2931 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2932 | { |
2933 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2934 | struct dst_entry *dst; | |
dc92095d MŻ |
2935 | struct flowi6 fl6 = { |
2936 | .flowi6_oif = oif, | |
2937 | .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark), | |
2938 | .daddr = iph->daddr, | |
2939 | .saddr = iph->saddr, | |
2940 | .flowlabel = ip6_flowinfo(iph), | |
2941 | .flowi6_uid = uid, | |
2942 | }; | |
81aded24 DM |
2943 | |
2944 | dst = ip6_route_output(net, NULL, &fl6); | |
2945 | if (!dst->error) | |
bd085ef6 | 2946 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true); |
81aded24 DM |
2947 | dst_release(dst); |
2948 | } | |
2949 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2950 | ||
2951 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2952 | { | |
7ddacfa5 | 2953 | int oif = sk->sk_bound_dev_if; |
33c162a9 MKL |
2954 | struct dst_entry *dst; |
2955 | ||
7ddacfa5 DA |
2956 | if (!oif && skb->dev) |
2957 | oif = l3mdev_master_ifindex(skb->dev); | |
2958 | ||
2959 | ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid); | |
33c162a9 MKL |
2960 | |
2961 | dst = __sk_dst_get(sk); | |
2962 | if (!dst || !dst->obsolete || | |
2963 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2964 | return; | |
2965 | ||
2966 | bh_lock_sock(sk); | |
2967 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2968 | ip6_datagram_dst_update(sk, false); | |
2969 | bh_unlock_sock(sk); | |
81aded24 DM |
2970 | } |
2971 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2972 | ||
7d6850f7 AK |
2973 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
2974 | const struct flowi6 *fl6) | |
2975 | { | |
2976 | #ifdef CONFIG_IPV6_SUBTREES | |
2977 | struct ipv6_pinfo *np = inet6_sk(sk); | |
2978 | #endif | |
2979 | ||
2980 | ip6_dst_store(sk, dst, | |
2981 | ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ? | |
2982 | &sk->sk_v6_daddr : NULL, | |
2983 | #ifdef CONFIG_IPV6_SUBTREES | |
2984 | ipv6_addr_equal(&fl6->saddr, &np->saddr) ? | |
2985 | &np->saddr : | |
2986 | #endif | |
2987 | NULL); | |
2988 | } | |
2989 | ||
9b6b35ab | 2990 | static bool ip6_redirect_nh_match(const struct fib6_result *res, |
0b34eb00 DA |
2991 | struct flowi6 *fl6, |
2992 | const struct in6_addr *gw, | |
2993 | struct rt6_info **ret) | |
2994 | { | |
9b6b35ab DA |
2995 | const struct fib6_nh *nh = res->nh; |
2996 | ||
0b34eb00 DA |
2997 | if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family || |
2998 | fl6->flowi6_oif != nh->fib_nh_dev->ifindex) | |
2999 | return false; | |
3000 | ||
3001 | /* rt_cache's gateway might be different from its 'parent' | |
3002 | * in the case of an ip redirect. | |
3003 | * So we keep searching in the exception table if the gateway | |
3004 | * is different. | |
3005 | */ | |
3006 | if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) { | |
3007 | struct rt6_info *rt_cache; | |
3008 | ||
9b6b35ab | 3009 | rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr); |
0b34eb00 DA |
3010 | if (rt_cache && |
3011 | ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) { | |
3012 | *ret = rt_cache; | |
3013 | return true; | |
3014 | } | |
3015 | return false; | |
3016 | } | |
3017 | return true; | |
3018 | } | |
3019 | ||
c55c8988 DA |
3020 | struct fib6_nh_rd_arg { |
3021 | struct fib6_result *res; | |
3022 | struct flowi6 *fl6; | |
3023 | const struct in6_addr *gw; | |
3024 | struct rt6_info **ret; | |
3025 | }; | |
3026 | ||
3027 | static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg) | |
3028 | { | |
3029 | struct fib6_nh_rd_arg *arg = _arg; | |
3030 | ||
3031 | arg->res->nh = nh; | |
3032 | return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret); | |
3033 | } | |
3034 | ||
b55b76b2 DJ |
3035 | /* Handle redirects */ |
3036 | struct ip6rd_flowi { | |
3037 | struct flowi6 fl6; | |
3038 | struct in6_addr gateway; | |
3039 | }; | |
3040 | ||
55cced4f | 3041 | INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net, |
b55b76b2 DJ |
3042 | struct fib6_table *table, |
3043 | struct flowi6 *fl6, | |
b75cc8f9 | 3044 | const struct sk_buff *skb, |
b55b76b2 DJ |
3045 | int flags) |
3046 | { | |
3047 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
0b34eb00 | 3048 | struct rt6_info *ret = NULL; |
9b6b35ab | 3049 | struct fib6_result res = {}; |
c55c8988 DA |
3050 | struct fib6_nh_rd_arg arg = { |
3051 | .res = &res, | |
3052 | .fl6 = fl6, | |
3053 | .gw = &rdfl->gateway, | |
3054 | .ret = &ret | |
3055 | }; | |
8d1c802b | 3056 | struct fib6_info *rt; |
b55b76b2 DJ |
3057 | struct fib6_node *fn; |
3058 | ||
31680ac2 DA |
3059 | /* l3mdev_update_flow overrides oif if the device is enslaved; in |
3060 | * this case we must match on the real ingress device, so reset it | |
3061 | */ | |
3062 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) | |
3063 | fl6->flowi6_oif = skb->dev->ifindex; | |
3064 | ||
b55b76b2 | 3065 | /* Get the "current" route for this destination and |
67c408cf | 3066 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
3067 | * |
3068 | * RFC 4861 specifies that redirects should only be | |
3069 | * accepted if they come from the nexthop to the target. | |
3070 | * Due to the way the routes are chosen, this notion | |
3071 | * is a bit fuzzy and one might need to check all possible | |
3072 | * routes. | |
3073 | */ | |
3074 | ||
66f5d6ce | 3075 | rcu_read_lock(); |
6454743b | 3076 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
b55b76b2 | 3077 | restart: |
66f5d6ce | 3078 | for_each_fib6_node_rt_rcu(fn) { |
9b6b35ab | 3079 | res.f6i = rt; |
14895687 | 3080 | if (fib6_check_expired(rt)) |
b55b76b2 | 3081 | continue; |
93c2fb25 | 3082 | if (rt->fib6_flags & RTF_REJECT) |
b55b76b2 | 3083 | break; |
c55c8988 DA |
3084 | if (unlikely(rt->nh)) { |
3085 | if (nexthop_is_blackhole(rt->nh)) | |
3086 | continue; | |
3087 | /* on match, res->nh is filled in and potentially ret */ | |
3088 | if (nexthop_for_each_fib6_nh(rt->nh, | |
3089 | fib6_nh_redirect_match, | |
3090 | &arg)) | |
3091 | goto out; | |
3092 | } else { | |
3093 | res.nh = rt->fib6_nh; | |
3094 | if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, | |
3095 | &ret)) | |
3096 | goto out; | |
3097 | } | |
b55b76b2 DJ |
3098 | } |
3099 | ||
3100 | if (!rt) | |
421842ed | 3101 | rt = net->ipv6.fib6_null_entry; |
93c2fb25 | 3102 | else if (rt->fib6_flags & RTF_REJECT) { |
23fb93a4 | 3103 | ret = net->ipv6.ip6_null_entry; |
b0a1ba59 MKL |
3104 | goto out; |
3105 | } | |
3106 | ||
421842ed | 3107 | if (rt == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
3108 | fn = fib6_backtrack(fn, &fl6->saddr); |
3109 | if (fn) | |
3110 | goto restart; | |
b55b76b2 | 3111 | } |
a3c00e46 | 3112 | |
9b6b35ab | 3113 | res.f6i = rt; |
1cf844c7 | 3114 | res.nh = rt->fib6_nh; |
b0a1ba59 | 3115 | out: |
7d21fec9 | 3116 | if (ret) { |
10585b43 | 3117 | ip6_hold_safe(net, &ret); |
7d21fec9 DA |
3118 | } else { |
3119 | res.fib6_flags = res.f6i->fib6_flags; | |
3120 | res.fib6_type = res.f6i->fib6_type; | |
9b6b35ab | 3121 | ret = ip6_create_rt_rcu(&res); |
7d21fec9 | 3122 | } |
b55b76b2 | 3123 | |
66f5d6ce | 3124 | rcu_read_unlock(); |
b55b76b2 | 3125 | |
8ff2e5b2 | 3126 | trace_fib6_table_lookup(net, &res, table, fl6); |
23fb93a4 | 3127 | return ret; |
b55b76b2 DJ |
3128 | }; |
3129 | ||
3130 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
b75cc8f9 DA |
3131 | const struct flowi6 *fl6, |
3132 | const struct sk_buff *skb, | |
3133 | const struct in6_addr *gateway) | |
b55b76b2 DJ |
3134 | { |
3135 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
3136 | struct ip6rd_flowi rdfl; | |
3137 | ||
3138 | rdfl.fl6 = *fl6; | |
3139 | rdfl.gateway = *gateway; | |
3140 | ||
b75cc8f9 | 3141 | return fib6_rule_lookup(net, &rdfl.fl6, skb, |
b55b76b2 DJ |
3142 | flags, __ip6_route_redirect); |
3143 | } | |
3144 | ||
e2d118a1 LC |
3145 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
3146 | kuid_t uid) | |
3a5ad2ee DM |
3147 | { |
3148 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
3149 | struct dst_entry *dst; | |
1f7f10ac MŻ |
3150 | struct flowi6 fl6 = { |
3151 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3152 | .flowi6_oif = oif, | |
3153 | .flowi6_mark = mark, | |
3154 | .daddr = iph->daddr, | |
3155 | .saddr = iph->saddr, | |
3156 | .flowlabel = ip6_flowinfo(iph), | |
3157 | .flowi6_uid = uid, | |
3158 | }; | |
3a5ad2ee | 3159 | |
b75cc8f9 | 3160 | dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr); |
b55b76b2 | 3161 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
3162 | dst_release(dst); |
3163 | } | |
3164 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
3165 | ||
d456336d | 3166 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif) |
c92a59ec DJ |
3167 | { |
3168 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
3169 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
3170 | struct dst_entry *dst; | |
0b26fb17 MŻ |
3171 | struct flowi6 fl6 = { |
3172 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3173 | .flowi6_oif = oif, | |
0b26fb17 MŻ |
3174 | .daddr = msg->dest, |
3175 | .saddr = iph->daddr, | |
3176 | .flowi6_uid = sock_net_uid(net, NULL), | |
3177 | }; | |
c92a59ec | 3178 | |
b75cc8f9 | 3179 | dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr); |
b55b76b2 | 3180 | rt6_do_redirect(dst, NULL, skb); |
c92a59ec DJ |
3181 | dst_release(dst); |
3182 | } | |
3183 | ||
3a5ad2ee DM |
3184 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
3185 | { | |
e2d118a1 LC |
3186 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
3187 | sk->sk_uid); | |
3a5ad2ee DM |
3188 | } |
3189 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
3190 | ||
0dbaee3b | 3191 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 3192 | { |
0dbaee3b DM |
3193 | struct net_device *dev = dst->dev; |
3194 | unsigned int mtu = dst_mtu(dst); | |
3195 | struct net *net = dev_net(dev); | |
3196 | ||
1da177e4 LT |
3197 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
3198 | ||
5578689a DL |
3199 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
3200 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
3201 | |
3202 | /* | |
1ab1457c YH |
3203 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
3204 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
3205 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
3206 | * rely only on pmtu discovery" |
3207 | */ | |
3208 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
3209 | mtu = IPV6_MAXPLEN; | |
3210 | return mtu; | |
3211 | } | |
3212 | ||
f67fbeae | 3213 | INDIRECT_CALLABLE_SCOPE unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 3214 | { |
427faee1 | 3215 | return ip6_dst_mtu_maybe_forward(dst, false); |
d33e4553 | 3216 | } |
9c97921a | 3217 | EXPORT_INDIRECT_CALLABLE(ip6_mtu); |
d33e4553 | 3218 | |
901731b8 DA |
3219 | /* MTU selection: |
3220 | * 1. mtu on route is locked - use it | |
3221 | * 2. mtu from nexthop exception | |
3222 | * 3. mtu from egress device | |
3223 | * | |
3224 | * based on ip6_dst_mtu_forward and exception logic of | |
3225 | * rt6_find_cached_rt; called with rcu_read_lock | |
3226 | */ | |
b748f260 DA |
3227 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
3228 | const struct in6_addr *daddr, | |
3229 | const struct in6_addr *saddr) | |
901731b8 | 3230 | { |
b748f260 DA |
3231 | const struct fib6_nh *nh = res->nh; |
3232 | struct fib6_info *f6i = res->f6i; | |
901731b8 | 3233 | struct inet6_dev *idev; |
510e2ced | 3234 | struct rt6_info *rt; |
901731b8 DA |
3235 | u32 mtu = 0; |
3236 | ||
3237 | if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) { | |
3238 | mtu = f6i->fib6_pmtu; | |
3239 | if (mtu) | |
3240 | goto out; | |
3241 | } | |
3242 | ||
510e2ced WW |
3243 | rt = rt6_find_cached_rt(res, daddr, saddr); |
3244 | if (unlikely(rt)) { | |
3245 | mtu = dst_metric_raw(&rt->dst, RTAX_MTU); | |
3246 | } else { | |
b748f260 | 3247 | struct net_device *dev = nh->fib_nh_dev; |
901731b8 DA |
3248 | |
3249 | mtu = IPV6_MIN_MTU; | |
3250 | idev = __in6_dev_get(dev); | |
3251 | if (idev && idev->cnf.mtu6 > mtu) | |
3252 | mtu = idev->cnf.mtu6; | |
3253 | } | |
3254 | ||
3255 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); | |
3256 | out: | |
b748f260 | 3257 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
901731b8 DA |
3258 | } |
3259 | ||
3b00944c | 3260 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 3261 | struct flowi6 *fl6) |
1da177e4 | 3262 | { |
87a11578 | 3263 | struct dst_entry *dst; |
1da177e4 LT |
3264 | struct rt6_info *rt; |
3265 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 3266 | struct net *net = dev_net(dev); |
1da177e4 | 3267 | |
38308473 | 3268 | if (unlikely(!idev)) |
122bdf67 | 3269 | return ERR_PTR(-ENODEV); |
1da177e4 | 3270 | |
ad706862 | 3271 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 3272 | if (unlikely(!rt)) { |
1da177e4 | 3273 | in6_dev_put(idev); |
87a11578 | 3274 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
3275 | goto out; |
3276 | } | |
3277 | ||
588753f1 | 3278 | rt->dst.input = ip6_input; |
8e2ec639 | 3279 | rt->dst.output = ip6_output; |
550bab42 | 3280 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 3281 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
3282 | rt->rt6i_dst.plen = 128; |
3283 | rt->rt6i_idev = idev; | |
14edd87d | 3284 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 3285 | |
4c981e28 | 3286 | /* Add this dst into uncached_list so that rt6_disable_ip() can |
587fea74 WW |
3287 | * do proper release of the net_device |
3288 | */ | |
3289 | rt6_uncached_list_add(rt); | |
81eb8447 | 3290 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1da177e4 | 3291 | |
87a11578 DM |
3292 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
3293 | ||
1da177e4 | 3294 | out: |
87a11578 | 3295 | return dst; |
1da177e4 LT |
3296 | } |
3297 | ||
569d3645 | 3298 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 3299 | { |
86393e52 | 3300 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
3301 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
3302 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
3303 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3304 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3305 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
b00798d0 | 3306 | unsigned int val; |
fc66f95c | 3307 | int entries; |
7019b78e | 3308 | |
fc66f95c | 3309 | entries = dst_entries_get_fast(ops); |
cf86a086 ED |
3310 | if (entries > rt_max_size) |
3311 | entries = dst_entries_get_slow(ops); | |
3312 | ||
49a18d86 | 3313 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 3314 | entries <= rt_max_size) |
1da177e4 LT |
3315 | goto out; |
3316 | ||
b00798d0 | 3317 | fib6_run_gc(atomic_inc_return(&net->ipv6.ip6_rt_gc_expire), net, true); |
fc66f95c ED |
3318 | entries = dst_entries_get_slow(ops); |
3319 | if (entries < ops->gc_thresh) | |
b00798d0 | 3320 | atomic_set(&net->ipv6.ip6_rt_gc_expire, rt_gc_timeout >> 1); |
1da177e4 | 3321 | out: |
b00798d0 ED |
3322 | val = atomic_read(&net->ipv6.ip6_rt_gc_expire); |
3323 | atomic_set(&net->ipv6.ip6_rt_gc_expire, val - (val >> rt_elasticity)); | |
fc66f95c | 3324 | return entries > rt_max_size; |
1da177e4 LT |
3325 | } |
3326 | ||
b2c709cc DA |
3327 | static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg, |
3328 | const struct in6_addr *gw_addr, u32 tbid, | |
3329 | int flags, struct fib6_result *res) | |
8c14586f DA |
3330 | { |
3331 | struct flowi6 fl6 = { | |
3332 | .flowi6_oif = cfg->fc_ifindex, | |
3333 | .daddr = *gw_addr, | |
3334 | .saddr = cfg->fc_prefsrc, | |
3335 | }; | |
3336 | struct fib6_table *table; | |
b2c709cc | 3337 | int err; |
8c14586f | 3338 | |
f4797b33 | 3339 | table = fib6_get_table(net, tbid); |
8c14586f | 3340 | if (!table) |
b2c709cc | 3341 | return -EINVAL; |
8c14586f DA |
3342 | |
3343 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
3344 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3345 | ||
f4797b33 | 3346 | flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f | 3347 | |
b2c709cc DA |
3348 | err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags); |
3349 | if (!err && res->f6i != net->ipv6.fib6_null_entry) | |
3350 | fib6_select_path(net, res, &fl6, cfg->fc_ifindex, | |
3351 | cfg->fc_ifindex != 0, NULL, flags); | |
8c14586f | 3352 | |
b2c709cc | 3353 | return err; |
8c14586f DA |
3354 | } |
3355 | ||
fc1e64e1 DA |
3356 | static int ip6_route_check_nh_onlink(struct net *net, |
3357 | struct fib6_config *cfg, | |
9fbb704c | 3358 | const struct net_device *dev, |
fc1e64e1 DA |
3359 | struct netlink_ext_ack *extack) |
3360 | { | |
b2c709cc | 3361 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; |
fc1e64e1 | 3362 | const struct in6_addr *gw_addr = &cfg->fc_gateway; |
b2c709cc | 3363 | struct fib6_result res = {}; |
fc1e64e1 DA |
3364 | int err; |
3365 | ||
b2c709cc DA |
3366 | err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res); |
3367 | if (!err && !(res.fib6_flags & RTF_REJECT) && | |
3368 | /* ignore match if it is the default route */ | |
3369 | !ipv6_addr_any(&res.f6i->fib6_dst.addr) && | |
3370 | (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) { | |
3371 | NL_SET_ERR_MSG(extack, | |
3372 | "Nexthop has invalid gateway or device mismatch"); | |
3373 | err = -EINVAL; | |
fc1e64e1 DA |
3374 | } |
3375 | ||
3376 | return err; | |
3377 | } | |
3378 | ||
1edce99f DA |
3379 | static int ip6_route_check_nh(struct net *net, |
3380 | struct fib6_config *cfg, | |
3381 | struct net_device **_dev, | |
3382 | struct inet6_dev **idev) | |
3383 | { | |
3384 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3385 | struct net_device *dev = _dev ? *_dev : NULL; | |
b2c709cc DA |
3386 | int flags = RT6_LOOKUP_F_IFACE; |
3387 | struct fib6_result res = {}; | |
1edce99f DA |
3388 | int err = -EHOSTUNREACH; |
3389 | ||
3390 | if (cfg->fc_table) { | |
b2c709cc DA |
3391 | err = ip6_nh_lookup_table(net, cfg, gw_addr, |
3392 | cfg->fc_table, flags, &res); | |
3393 | /* gw_addr can not require a gateway or resolve to a reject | |
3394 | * route. If a device is given, it must match the result. | |
3395 | */ | |
3396 | if (err || res.fib6_flags & RTF_REJECT || | |
3397 | res.nh->fib_nh_gw_family || | |
3398 | (dev && dev != res.nh->fib_nh_dev)) | |
3399 | err = -EHOSTUNREACH; | |
1edce99f DA |
3400 | } |
3401 | ||
b2c709cc DA |
3402 | if (err < 0) { |
3403 | struct flowi6 fl6 = { | |
3404 | .flowi6_oif = cfg->fc_ifindex, | |
3405 | .daddr = *gw_addr, | |
3406 | }; | |
1edce99f | 3407 | |
b2c709cc DA |
3408 | err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags); |
3409 | if (err || res.fib6_flags & RTF_REJECT || | |
3410 | res.nh->fib_nh_gw_family) | |
3411 | err = -EHOSTUNREACH; | |
3412 | ||
3413 | if (err) | |
3414 | return err; | |
3415 | ||
3416 | fib6_select_path(net, &res, &fl6, cfg->fc_ifindex, | |
3417 | cfg->fc_ifindex != 0, NULL, flags); | |
3418 | } | |
1edce99f | 3419 | |
b2c709cc | 3420 | err = 0; |
1edce99f | 3421 | if (dev) { |
b2c709cc DA |
3422 | if (dev != res.nh->fib_nh_dev) |
3423 | err = -EHOSTUNREACH; | |
1edce99f | 3424 | } else { |
b2c709cc | 3425 | *_dev = dev = res.nh->fib_nh_dev; |
1edce99f | 3426 | dev_hold(dev); |
b2c709cc | 3427 | *idev = in6_dev_get(dev); |
1edce99f DA |
3428 | } |
3429 | ||
1edce99f DA |
3430 | return err; |
3431 | } | |
3432 | ||
9fbb704c DA |
3433 | static int ip6_validate_gw(struct net *net, struct fib6_config *cfg, |
3434 | struct net_device **_dev, struct inet6_dev **idev, | |
3435 | struct netlink_ext_ack *extack) | |
3436 | { | |
3437 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3438 | int gwa_type = ipv6_addr_type(gw_addr); | |
232378e8 | 3439 | bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true; |
9fbb704c | 3440 | const struct net_device *dev = *_dev; |
232378e8 | 3441 | bool need_addr_check = !dev; |
9fbb704c DA |
3442 | int err = -EINVAL; |
3443 | ||
3444 | /* if gw_addr is local we will fail to detect this in case | |
3445 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
3446 | * will return already-added prefix route via interface that | |
3447 | * prefix route was assigned to, which might be non-loopback. | |
3448 | */ | |
232378e8 DA |
3449 | if (dev && |
3450 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3451 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
9fbb704c DA |
3452 | goto out; |
3453 | } | |
3454 | ||
3455 | if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) { | |
3456 | /* IPv6 strictly inhibits using not link-local | |
3457 | * addresses as nexthop address. | |
3458 | * Otherwise, router will not able to send redirects. | |
3459 | * It is very good, but in some (rare!) circumstances | |
3460 | * (SIT, PtP, NBMA NOARP links) it is handy to allow | |
3461 | * some exceptions. --ANK | |
3462 | * We allow IPv4-mapped nexthops to support RFC4798-type | |
3463 | * addressing | |
3464 | */ | |
3465 | if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) { | |
3466 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
3467 | goto out; | |
3468 | } | |
3469 | ||
b2c709cc DA |
3470 | rcu_read_lock(); |
3471 | ||
9fbb704c DA |
3472 | if (cfg->fc_flags & RTNH_F_ONLINK) |
3473 | err = ip6_route_check_nh_onlink(net, cfg, dev, extack); | |
3474 | else | |
3475 | err = ip6_route_check_nh(net, cfg, _dev, idev); | |
3476 | ||
b2c709cc DA |
3477 | rcu_read_unlock(); |
3478 | ||
9fbb704c DA |
3479 | if (err) |
3480 | goto out; | |
3481 | } | |
3482 | ||
3483 | /* reload in case device was changed */ | |
3484 | dev = *_dev; | |
3485 | ||
3486 | err = -EINVAL; | |
3487 | if (!dev) { | |
3488 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
3489 | goto out; | |
3490 | } else if (dev->flags & IFF_LOOPBACK) { | |
3491 | NL_SET_ERR_MSG(extack, | |
3492 | "Egress device can not be loopback device for this route"); | |
3493 | goto out; | |
3494 | } | |
232378e8 DA |
3495 | |
3496 | /* if we did not check gw_addr above, do so now that the | |
3497 | * egress device has been resolved. | |
3498 | */ | |
3499 | if (need_addr_check && | |
3500 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3501 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
3502 | goto out; | |
3503 | } | |
3504 | ||
9fbb704c DA |
3505 | err = 0; |
3506 | out: | |
3507 | return err; | |
3508 | } | |
3509 | ||
83c44251 DA |
3510 | static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type) |
3511 | { | |
3512 | if ((flags & RTF_REJECT) || | |
3513 | (dev && (dev->flags & IFF_LOOPBACK) && | |
3514 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
aea23c32 | 3515 | !(flags & (RTF_ANYCAST | RTF_LOCAL)))) |
83c44251 DA |
3516 | return true; |
3517 | ||
3518 | return false; | |
3519 | } | |
3520 | ||
3521 | int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, | |
3522 | struct fib6_config *cfg, gfp_t gfp_flags, | |
3523 | struct netlink_ext_ack *extack) | |
3524 | { | |
3525 | struct net_device *dev = NULL; | |
3526 | struct inet6_dev *idev = NULL; | |
3527 | int addr_type; | |
3528 | int err; | |
3529 | ||
f1741730 | 3530 | fib6_nh->fib_nh_family = AF_INET6; |
1bef4c22 ED |
3531 | #ifdef CONFIG_IPV6_ROUTER_PREF |
3532 | fib6_nh->last_probe = jiffies; | |
3533 | #endif | |
38428d68 RP |
3534 | if (cfg->fc_is_fdb) { |
3535 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; | |
3536 | fib6_nh->fib_nh_gw_family = AF_INET6; | |
3537 | return 0; | |
3538 | } | |
f1741730 | 3539 | |
83c44251 DA |
3540 | err = -ENODEV; |
3541 | if (cfg->fc_ifindex) { | |
3542 | dev = dev_get_by_index(net, cfg->fc_ifindex); | |
3543 | if (!dev) | |
3544 | goto out; | |
3545 | idev = in6_dev_get(dev); | |
3546 | if (!idev) | |
3547 | goto out; | |
3548 | } | |
3549 | ||
3550 | if (cfg->fc_flags & RTNH_F_ONLINK) { | |
3551 | if (!dev) { | |
3552 | NL_SET_ERR_MSG(extack, | |
3553 | "Nexthop device required for onlink"); | |
3554 | goto out; | |
3555 | } | |
3556 | ||
3557 | if (!(dev->flags & IFF_UP)) { | |
3558 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3559 | err = -ENETDOWN; | |
3560 | goto out; | |
3561 | } | |
3562 | ||
ad1601ae | 3563 | fib6_nh->fib_nh_flags |= RTNH_F_ONLINK; |
83c44251 DA |
3564 | } |
3565 | ||
ad1601ae | 3566 | fib6_nh->fib_nh_weight = 1; |
83c44251 DA |
3567 | |
3568 | /* We cannot add true routes via loopback here, | |
3569 | * they would result in kernel looping; promote them to reject routes | |
3570 | */ | |
3571 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3572 | if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) { | |
3573 | /* hold loopback dev/idev if we haven't done so. */ | |
3574 | if (dev != net->loopback_dev) { | |
3575 | if (dev) { | |
3576 | dev_put(dev); | |
3577 | in6_dev_put(idev); | |
3578 | } | |
3579 | dev = net->loopback_dev; | |
3580 | dev_hold(dev); | |
3581 | idev = in6_dev_get(dev); | |
3582 | if (!idev) { | |
3583 | err = -ENODEV; | |
3584 | goto out; | |
3585 | } | |
3586 | } | |
7dd73168 | 3587 | goto pcpu_alloc; |
83c44251 DA |
3588 | } |
3589 | ||
3590 | if (cfg->fc_flags & RTF_GATEWAY) { | |
3591 | err = ip6_validate_gw(net, cfg, &dev, &idev, extack); | |
3592 | if (err) | |
3593 | goto out; | |
3594 | ||
ad1601ae | 3595 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; |
bdf00467 | 3596 | fib6_nh->fib_nh_gw_family = AF_INET6; |
83c44251 DA |
3597 | } |
3598 | ||
3599 | err = -ENODEV; | |
3600 | if (!dev) | |
3601 | goto out; | |
3602 | ||
3603 | if (idev->cnf.disable_ipv6) { | |
3604 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device"); | |
3605 | err = -EACCES; | |
3606 | goto out; | |
3607 | } | |
3608 | ||
3609 | if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) { | |
3610 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3611 | err = -ENETDOWN; | |
3612 | goto out; | |
3613 | } | |
3614 | ||
3615 | if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) && | |
3616 | !netif_carrier_ok(dev)) | |
ad1601ae | 3617 | fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
83c44251 | 3618 | |
faee6769 | 3619 | err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap, |
7dd73168 DA |
3620 | cfg->fc_encap_type, cfg, gfp_flags, extack); |
3621 | if (err) | |
3622 | goto out; | |
3623 | ||
3624 | pcpu_alloc: | |
f40b6ae2 DA |
3625 | fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags); |
3626 | if (!fib6_nh->rt6i_pcpu) { | |
3627 | err = -ENOMEM; | |
3628 | goto out; | |
3629 | } | |
3630 | ||
ad1601ae | 3631 | fib6_nh->fib_nh_dev = dev; |
f1741730 | 3632 | fib6_nh->fib_nh_oif = dev->ifindex; |
83c44251 DA |
3633 | err = 0; |
3634 | out: | |
3635 | if (idev) | |
3636 | in6_dev_put(idev); | |
3637 | ||
3638 | if (err) { | |
ad1601ae DA |
3639 | lwtstate_put(fib6_nh->fib_nh_lws); |
3640 | fib6_nh->fib_nh_lws = NULL; | |
1160dfa1 | 3641 | dev_put(dev); |
83c44251 DA |
3642 | } |
3643 | ||
3644 | return err; | |
3645 | } | |
3646 | ||
dac7d0f2 DA |
3647 | void fib6_nh_release(struct fib6_nh *fib6_nh) |
3648 | { | |
cc5c073a DA |
3649 | struct rt6_exception_bucket *bucket; |
3650 | ||
3651 | rcu_read_lock(); | |
3652 | ||
3653 | fib6_nh_flush_exceptions(fib6_nh, NULL); | |
3654 | bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL); | |
3655 | if (bucket) { | |
3656 | rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL); | |
3657 | kfree(bucket); | |
3658 | } | |
3659 | ||
3660 | rcu_read_unlock(); | |
3661 | ||
f40b6ae2 DA |
3662 | if (fib6_nh->rt6i_pcpu) { |
3663 | int cpu; | |
3664 | ||
3665 | for_each_possible_cpu(cpu) { | |
3666 | struct rt6_info **ppcpu_rt; | |
3667 | struct rt6_info *pcpu_rt; | |
3668 | ||
3669 | ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu); | |
3670 | pcpu_rt = *ppcpu_rt; | |
3671 | if (pcpu_rt) { | |
3672 | dst_dev_put(&pcpu_rt->dst); | |
3673 | dst_release(&pcpu_rt->dst); | |
3674 | *ppcpu_rt = NULL; | |
3675 | } | |
3676 | } | |
3677 | ||
3678 | free_percpu(fib6_nh->rt6i_pcpu); | |
3679 | } | |
3680 | ||
979e276e | 3681 | fib_nh_common_release(&fib6_nh->nh_common); |
dac7d0f2 DA |
3682 | } |
3683 | ||
4f28f3fd NA |
3684 | void fib6_nh_release_dsts(struct fib6_nh *fib6_nh) |
3685 | { | |
3686 | int cpu; | |
3687 | ||
3688 | if (!fib6_nh->rt6i_pcpu) | |
3689 | return; | |
3690 | ||
3691 | for_each_possible_cpu(cpu) { | |
3692 | struct rt6_info *pcpu_rt, **ppcpu_rt; | |
3693 | ||
3694 | ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu); | |
3695 | pcpu_rt = xchg(ppcpu_rt, NULL); | |
3696 | if (pcpu_rt) { | |
3697 | dst_dev_put(&pcpu_rt->dst); | |
3698 | dst_release(&pcpu_rt->dst); | |
3699 | } | |
3700 | } | |
3701 | } | |
3702 | ||
8d1c802b | 3703 | static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, |
acb54e3c | 3704 | gfp_t gfp_flags, |
333c4301 | 3705 | struct netlink_ext_ack *extack) |
1da177e4 | 3706 | { |
5578689a | 3707 | struct net *net = cfg->fc_nlinfo.nl_net; |
8d1c802b | 3708 | struct fib6_info *rt = NULL; |
f88d8ea6 | 3709 | struct nexthop *nh = NULL; |
c71099ac | 3710 | struct fib6_table *table; |
f88d8ea6 | 3711 | struct fib6_nh *fib6_nh; |
8c5b83f0 | 3712 | int err = -EINVAL; |
83c44251 | 3713 | int addr_type; |
1da177e4 | 3714 | |
557c44be | 3715 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
3716 | if (cfg->fc_flags & RTF_PCPU) { |
3717 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 3718 | goto out; |
d5d531cb | 3719 | } |
557c44be | 3720 | |
2ea2352e WW |
3721 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
3722 | if (cfg->fc_flags & RTF_CACHE) { | |
3723 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
3724 | goto out; | |
3725 | } | |
3726 | ||
e8478e80 DA |
3727 | if (cfg->fc_type > RTN_MAX) { |
3728 | NL_SET_ERR_MSG(extack, "Invalid route type"); | |
3729 | goto out; | |
3730 | } | |
3731 | ||
d5d531cb DA |
3732 | if (cfg->fc_dst_len > 128) { |
3733 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
3734 | goto out; | |
3735 | } | |
3736 | if (cfg->fc_src_len > 128) { | |
3737 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 3738 | goto out; |
d5d531cb | 3739 | } |
1da177e4 | 3740 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
3741 | if (cfg->fc_src_len) { |
3742 | NL_SET_ERR_MSG(extack, | |
3743 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 3744 | goto out; |
d5d531cb | 3745 | } |
1da177e4 | 3746 | #endif |
5b98324e DA |
3747 | if (cfg->fc_nh_id) { |
3748 | nh = nexthop_find_by_id(net, cfg->fc_nh_id); | |
3749 | if (!nh) { | |
3750 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
3751 | goto out; | |
3752 | } | |
3753 | err = fib6_check_nexthop(nh, cfg, extack); | |
3754 | if (err) | |
3755 | goto out; | |
3756 | } | |
fc1e64e1 | 3757 | |
d71314b4 | 3758 | err = -ENOBUFS; |
38308473 DM |
3759 | if (cfg->fc_nlinfo.nlh && |
3760 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 3761 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 3762 | if (!table) { |
f3213831 | 3763 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
3764 | table = fib6_new_table(net, cfg->fc_table); |
3765 | } | |
3766 | } else { | |
3767 | table = fib6_new_table(net, cfg->fc_table); | |
3768 | } | |
38308473 DM |
3769 | |
3770 | if (!table) | |
c71099ac | 3771 | goto out; |
c71099ac | 3772 | |
93531c67 | 3773 | err = -ENOMEM; |
f88d8ea6 | 3774 | rt = fib6_info_alloc(gfp_flags, !nh); |
93531c67 | 3775 | if (!rt) |
1da177e4 | 3776 | goto out; |
93531c67 | 3777 | |
d7e774f3 DA |
3778 | rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len, |
3779 | extack); | |
767a2217 DA |
3780 | if (IS_ERR(rt->fib6_metrics)) { |
3781 | err = PTR_ERR(rt->fib6_metrics); | |
fda21d46 ED |
3782 | /* Do not leave garbage there. */ |
3783 | rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics; | |
8fb4792f | 3784 | goto out_free; |
767a2217 DA |
3785 | } |
3786 | ||
93531c67 DA |
3787 | if (cfg->fc_flags & RTF_ADDRCONF) |
3788 | rt->dst_nocount = true; | |
1da177e4 | 3789 | |
1716a961 | 3790 | if (cfg->fc_flags & RTF_EXPIRES) |
14895687 | 3791 | fib6_set_expires(rt, jiffies + |
1716a961 G |
3792 | clock_t_to_jiffies(cfg->fc_expires)); |
3793 | else | |
14895687 | 3794 | fib6_clean_expires(rt); |
1da177e4 | 3795 | |
86872cb5 TG |
3796 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
3797 | cfg->fc_protocol = RTPROT_BOOT; | |
93c2fb25 | 3798 | rt->fib6_protocol = cfg->fc_protocol; |
86872cb5 | 3799 | |
83c44251 DA |
3800 | rt->fib6_table = table; |
3801 | rt->fib6_metric = cfg->fc_metric; | |
c7036d97 | 3802 | rt->fib6_type = cfg->fc_type ? : RTN_UNICAST; |
2b2450ca | 3803 | rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY; |
19e42e45 | 3804 | |
93c2fb25 DA |
3805 | ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
3806 | rt->fib6_dst.plen = cfg->fc_dst_len; | |
e5fd387a | 3807 | |
1da177e4 | 3808 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
3809 | ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len); |
3810 | rt->fib6_src.plen = cfg->fc_src_len; | |
1da177e4 | 3811 | #endif |
f88d8ea6 | 3812 | if (nh) { |
f88d8ea6 | 3813 | if (rt->fib6_src.plen) { |
4daa95af | 3814 | NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing"); |
821bbf79 | 3815 | goto out_free; |
f88d8ea6 | 3816 | } |
706ec919 XY |
3817 | if (!nexthop_get(nh)) { |
3818 | NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); | |
821bbf79 | 3819 | goto out_free; |
706ec919 | 3820 | } |
f88d8ea6 DA |
3821 | rt->nh = nh; |
3822 | fib6_nh = nexthop_fib6_nh(rt->nh); | |
3823 | } else { | |
3824 | err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack); | |
3825 | if (err) | |
3826 | goto out; | |
1da177e4 | 3827 | |
f88d8ea6 DA |
3828 | fib6_nh = rt->fib6_nh; |
3829 | ||
3830 | /* We cannot add true routes via loopback here, they would | |
3831 | * result in kernel looping; promote them to reject routes | |
3832 | */ | |
3833 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3834 | if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev, | |
3835 | addr_type)) | |
3836 | rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP; | |
3837 | } | |
955ec4cb | 3838 | |
c3968a85 | 3839 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
f88d8ea6 | 3840 | struct net_device *dev = fib6_nh->fib_nh_dev; |
83c44251 | 3841 | |
c3968a85 | 3842 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { |
d5d531cb | 3843 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
3844 | err = -EINVAL; |
3845 | goto out; | |
3846 | } | |
93c2fb25 DA |
3847 | rt->fib6_prefsrc.addr = cfg->fc_prefsrc; |
3848 | rt->fib6_prefsrc.plen = 128; | |
c3968a85 | 3849 | } else |
93c2fb25 | 3850 | rt->fib6_prefsrc.plen = 0; |
c3968a85 | 3851 | |
8c5b83f0 | 3852 | return rt; |
6b9ea5a6 | 3853 | out: |
93531c67 | 3854 | fib6_info_release(rt); |
8c5b83f0 | 3855 | return ERR_PTR(err); |
821bbf79 CL |
3856 | out_free: |
3857 | ip_fib_metrics_put(rt->fib6_metrics); | |
3858 | kfree(rt); | |
3859 | return ERR_PTR(err); | |
6b9ea5a6 RP |
3860 | } |
3861 | ||
acb54e3c | 3862 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
333c4301 | 3863 | struct netlink_ext_ack *extack) |
6b9ea5a6 | 3864 | { |
8d1c802b | 3865 | struct fib6_info *rt; |
6b9ea5a6 RP |
3866 | int err; |
3867 | ||
acb54e3c | 3868 | rt = ip6_route_info_create(cfg, gfp_flags, extack); |
d4ead6b3 DA |
3869 | if (IS_ERR(rt)) |
3870 | return PTR_ERR(rt); | |
6b9ea5a6 | 3871 | |
d4ead6b3 | 3872 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack); |
93531c67 | 3873 | fib6_info_release(rt); |
6b9ea5a6 | 3874 | |
1da177e4 LT |
3875 | return err; |
3876 | } | |
3877 | ||
8d1c802b | 3878 | static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info) |
1da177e4 | 3879 | { |
afb1d4b5 | 3880 | struct net *net = info->nl_net; |
c71099ac | 3881 | struct fib6_table *table; |
afb1d4b5 | 3882 | int err; |
1da177e4 | 3883 | |
421842ed | 3884 | if (rt == net->ipv6.fib6_null_entry) { |
6825a26c G |
3885 | err = -ENOENT; |
3886 | goto out; | |
3887 | } | |
6c813a72 | 3888 | |
93c2fb25 | 3889 | table = rt->fib6_table; |
66f5d6ce | 3890 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 3891 | err = fib6_del(rt, info); |
66f5d6ce | 3892 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 3893 | |
6825a26c | 3894 | out: |
93531c67 | 3895 | fib6_info_release(rt); |
1da177e4 LT |
3896 | return err; |
3897 | } | |
3898 | ||
11dd74b3 | 3899 | int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify) |
e0a1ad73 | 3900 | { |
11dd74b3 RP |
3901 | struct nl_info info = { |
3902 | .nl_net = net, | |
3903 | .skip_notify = skip_notify | |
3904 | }; | |
afb1d4b5 | 3905 | |
528c4ceb | 3906 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
3907 | } |
3908 | ||
8d1c802b | 3909 | static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg) |
0ae81335 DA |
3910 | { |
3911 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 3912 | struct net *net = info->nl_net; |
16a16cd3 | 3913 | struct sk_buff *skb = NULL; |
0ae81335 | 3914 | struct fib6_table *table; |
e3330039 | 3915 | int err = -ENOENT; |
0ae81335 | 3916 | |
421842ed | 3917 | if (rt == net->ipv6.fib6_null_entry) |
e3330039 | 3918 | goto out_put; |
93c2fb25 | 3919 | table = rt->fib6_table; |
66f5d6ce | 3920 | spin_lock_bh(&table->tb6_lock); |
0ae81335 | 3921 | |
93c2fb25 | 3922 | if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) { |
8d1c802b | 3923 | struct fib6_info *sibling, *next_sibling; |
0284696b | 3924 | struct fib6_node *fn; |
0ae81335 | 3925 | |
16a16cd3 DA |
3926 | /* prefer to send a single notification with all hops */ |
3927 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
3928 | if (skb) { | |
3929 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
3930 | ||
d4ead6b3 | 3931 | if (rt6_fill_node(net, skb, rt, NULL, |
16a16cd3 DA |
3932 | NULL, NULL, 0, RTM_DELROUTE, |
3933 | info->portid, seq, 0) < 0) { | |
3934 | kfree_skb(skb); | |
3935 | skb = NULL; | |
3936 | } else | |
3937 | info->skip_notify = 1; | |
3938 | } | |
3939 | ||
0284696b IS |
3940 | /* 'rt' points to the first sibling route. If it is not the |
3941 | * leaf, then we do not need to send a notification. Otherwise, | |
3942 | * we need to check if the last sibling has a next route or not | |
3943 | * and emit a replace or delete notification, respectively. | |
3944 | */ | |
2881fd61 | 3945 | info->skip_notify_kernel = 1; |
0284696b IS |
3946 | fn = rcu_dereference_protected(rt->fib6_node, |
3947 | lockdep_is_held(&table->tb6_lock)); | |
3948 | if (rcu_access_pointer(fn->leaf) == rt) { | |
3949 | struct fib6_info *last_sibling, *replace_rt; | |
3950 | ||
3951 | last_sibling = list_last_entry(&rt->fib6_siblings, | |
3952 | struct fib6_info, | |
3953 | fib6_siblings); | |
3954 | replace_rt = rcu_dereference_protected( | |
3955 | last_sibling->fib6_next, | |
3956 | lockdep_is_held(&table->tb6_lock)); | |
3957 | if (replace_rt) | |
3958 | call_fib6_entry_notifiers_replace(net, | |
3959 | replace_rt); | |
3960 | else | |
3961 | call_fib6_multipath_entry_notifiers(net, | |
caafb250 | 3962 | FIB_EVENT_ENTRY_DEL, |
0284696b IS |
3963 | rt, rt->fib6_nsiblings, |
3964 | NULL); | |
3965 | } | |
0ae81335 | 3966 | list_for_each_entry_safe(sibling, next_sibling, |
93c2fb25 DA |
3967 | &rt->fib6_siblings, |
3968 | fib6_siblings) { | |
0ae81335 DA |
3969 | err = fib6_del(sibling, info); |
3970 | if (err) | |
e3330039 | 3971 | goto out_unlock; |
0ae81335 DA |
3972 | } |
3973 | } | |
3974 | ||
3975 | err = fib6_del(rt, info); | |
e3330039 | 3976 | out_unlock: |
66f5d6ce | 3977 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 3978 | out_put: |
93531c67 | 3979 | fib6_info_release(rt); |
16a16cd3 DA |
3980 | |
3981 | if (skb) { | |
e3330039 | 3982 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
3983 | info->nlh, gfp_any()); |
3984 | } | |
0ae81335 DA |
3985 | return err; |
3986 | } | |
3987 | ||
0fa6efc5 | 3988 | static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg) |
23fb93a4 DA |
3989 | { |
3990 | int rc = -ESRCH; | |
3991 | ||
3992 | if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex) | |
3993 | goto out; | |
3994 | ||
3995 | if (cfg->fc_flags & RTF_GATEWAY && | |
3996 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
3997 | goto out; | |
761f6026 XL |
3998 | |
3999 | rc = rt6_remove_exception_rt(rt); | |
23fb93a4 DA |
4000 | out: |
4001 | return rc; | |
4002 | } | |
4003 | ||
0fa6efc5 DA |
4004 | static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt, |
4005 | struct fib6_nh *nh) | |
4006 | { | |
4007 | struct fib6_result res = { | |
4008 | .f6i = rt, | |
4009 | .nh = nh, | |
4010 | }; | |
4011 | struct rt6_info *rt_cache; | |
4012 | ||
4013 | rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src); | |
4014 | if (rt_cache) | |
4015 | return __ip6_del_cached_rt(rt_cache, cfg); | |
4016 | ||
4017 | return 0; | |
4018 | } | |
4019 | ||
5b98324e DA |
4020 | struct fib6_nh_del_cached_rt_arg { |
4021 | struct fib6_config *cfg; | |
4022 | struct fib6_info *f6i; | |
4023 | }; | |
4024 | ||
4025 | static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg) | |
4026 | { | |
4027 | struct fib6_nh_del_cached_rt_arg *arg = _arg; | |
4028 | int rc; | |
4029 | ||
4030 | rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh); | |
4031 | return rc != -ESRCH ? rc : 0; | |
4032 | } | |
4033 | ||
4034 | static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i) | |
4035 | { | |
4036 | struct fib6_nh_del_cached_rt_arg arg = { | |
4037 | .cfg = cfg, | |
4038 | .f6i = f6i | |
4039 | }; | |
4040 | ||
4041 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg); | |
4042 | } | |
4043 | ||
333c4301 DA |
4044 | static int ip6_route_del(struct fib6_config *cfg, |
4045 | struct netlink_ext_ack *extack) | |
1da177e4 | 4046 | { |
c71099ac | 4047 | struct fib6_table *table; |
8d1c802b | 4048 | struct fib6_info *rt; |
1da177e4 | 4049 | struct fib6_node *fn; |
1da177e4 LT |
4050 | int err = -ESRCH; |
4051 | ||
5578689a | 4052 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
4053 | if (!table) { |
4054 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 4055 | return err; |
d5d531cb | 4056 | } |
c71099ac | 4057 | |
66f5d6ce | 4058 | rcu_read_lock(); |
1da177e4 | 4059 | |
c71099ac | 4060 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 4061 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 4062 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 4063 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 4064 | |
1da177e4 | 4065 | if (fn) { |
66f5d6ce | 4066 | for_each_fib6_node_rt_rcu(fn) { |
ad1601ae DA |
4067 | struct fib6_nh *nh; |
4068 | ||
3401bfb1 SB |
4069 | if (rt->nh && cfg->fc_nh_id && |
4070 | rt->nh->id != cfg->fc_nh_id) | |
5b98324e | 4071 | continue; |
23fb93a4 | 4072 | |
5b98324e DA |
4073 | if (cfg->fc_flags & RTF_CACHE) { |
4074 | int rc = 0; | |
4075 | ||
4076 | if (rt->nh) { | |
4077 | rc = ip6_del_cached_rt_nh(cfg, rt); | |
4078 | } else if (cfg->fc_nh_id) { | |
4079 | continue; | |
4080 | } else { | |
4081 | nh = rt->fib6_nh; | |
4082 | rc = ip6_del_cached_rt(cfg, rt, nh); | |
4083 | } | |
0fa6efc5 DA |
4084 | if (rc != -ESRCH) { |
4085 | rcu_read_unlock(); | |
4086 | return rc; | |
23fb93a4 DA |
4087 | } |
4088 | continue; | |
2b760fcf | 4089 | } |
ad1601ae | 4090 | |
5b98324e DA |
4091 | if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric) |
4092 | continue; | |
4093 | if (cfg->fc_protocol && | |
4094 | cfg->fc_protocol != rt->fib6_protocol) | |
4095 | continue; | |
4096 | ||
4097 | if (rt->nh) { | |
4098 | if (!fib6_info_hold_safe(rt)) | |
4099 | continue; | |
4100 | rcu_read_unlock(); | |
4101 | ||
4102 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
4103 | } | |
4104 | if (cfg->fc_nh_id) | |
4105 | continue; | |
4106 | ||
4107 | nh = rt->fib6_nh; | |
86872cb5 | 4108 | if (cfg->fc_ifindex && |
ad1601ae DA |
4109 | (!nh->fib_nh_dev || |
4110 | nh->fib_nh_dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 4111 | continue; |
86872cb5 | 4112 | if (cfg->fc_flags & RTF_GATEWAY && |
ad1601ae | 4113 | !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6)) |
1da177e4 | 4114 | continue; |
e873e4b9 WW |
4115 | if (!fib6_info_hold_safe(rt)) |
4116 | continue; | |
66f5d6ce | 4117 | rcu_read_unlock(); |
1da177e4 | 4118 | |
0ae81335 DA |
4119 | /* if gateway was specified only delete the one hop */ |
4120 | if (cfg->fc_flags & RTF_GATEWAY) | |
4121 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
4122 | ||
4123 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
4124 | } |
4125 | } | |
66f5d6ce | 4126 | rcu_read_unlock(); |
1da177e4 LT |
4127 | |
4128 | return err; | |
4129 | } | |
4130 | ||
6700c270 | 4131 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 4132 | { |
a6279458 | 4133 | struct netevent_redirect netevent; |
e8599ff4 | 4134 | struct rt6_info *rt, *nrt = NULL; |
85bd05de | 4135 | struct fib6_result res = {}; |
e8599ff4 DM |
4136 | struct ndisc_options ndopts; |
4137 | struct inet6_dev *in6_dev; | |
4138 | struct neighbour *neigh; | |
71bcdba0 | 4139 | struct rd_msg *msg; |
6e157b6a DM |
4140 | int optlen, on_link; |
4141 | u8 *lladdr; | |
e8599ff4 | 4142 | |
29a3cad5 | 4143 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 4144 | optlen -= sizeof(*msg); |
e8599ff4 DM |
4145 | |
4146 | if (optlen < 0) { | |
6e157b6a | 4147 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
4148 | return; |
4149 | } | |
4150 | ||
71bcdba0 | 4151 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 4152 | |
71bcdba0 | 4153 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 4154 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
4155 | return; |
4156 | } | |
4157 | ||
6e157b6a | 4158 | on_link = 0; |
71bcdba0 | 4159 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 4160 | on_link = 1; |
71bcdba0 | 4161 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 4162 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 4163 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
4164 | return; |
4165 | } | |
4166 | ||
4167 | in6_dev = __in6_dev_get(skb->dev); | |
4168 | if (!in6_dev) | |
4169 | return; | |
4170 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
4171 | return; | |
4172 | ||
4173 | /* RFC2461 8.1: | |
4174 | * The IP source address of the Redirect MUST be the same as the current | |
4175 | * first-hop router for the specified ICMP Destination Address. | |
4176 | */ | |
4177 | ||
f997c55c | 4178 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
4179 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
4180 | return; | |
4181 | } | |
6e157b6a DM |
4182 | |
4183 | lladdr = NULL; | |
e8599ff4 DM |
4184 | if (ndopts.nd_opts_tgt_lladdr) { |
4185 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
4186 | skb->dev); | |
4187 | if (!lladdr) { | |
4188 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
4189 | return; | |
4190 | } | |
4191 | } | |
4192 | ||
6e157b6a | 4193 | rt = (struct rt6_info *) dst; |
ec13ad1d | 4194 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 4195 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 4196 | return; |
6e157b6a | 4197 | } |
e8599ff4 | 4198 | |
6e157b6a DM |
4199 | /* Redirect received -> path was valid. |
4200 | * Look, redirects are sent only in response to data packets, | |
4201 | * so that this nexthop apparently is reachable. --ANK | |
4202 | */ | |
0dec879f | 4203 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 4204 | |
71bcdba0 | 4205 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
4206 | if (!neigh) |
4207 | return; | |
a6279458 | 4208 | |
1da177e4 LT |
4209 | /* |
4210 | * We have finally decided to accept it. | |
4211 | */ | |
4212 | ||
f997c55c | 4213 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
4214 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
4215 | NEIGH_UPDATE_F_OVERRIDE| | |
4216 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
4217 | NEIGH_UPDATE_F_ISROUTER)), |
4218 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 4219 | |
4d85cd0c | 4220 | rcu_read_lock(); |
85bd05de | 4221 | res.f6i = rcu_dereference(rt->from); |
ff24e498 | 4222 | if (!res.f6i) |
886b7a50 | 4223 | goto out; |
8a14e46f | 4224 | |
49d5b8ef DA |
4225 | if (res.f6i->nh) { |
4226 | struct fib6_nh_match_arg arg = { | |
4227 | .dev = dst->dev, | |
4228 | .gw = &rt->rt6i_gateway, | |
4229 | }; | |
4230 | ||
4231 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
4232 | fib6_nh_find_match, &arg); | |
4233 | ||
4234 | /* fib6_info uses a nexthop that does not have fib6_nh | |
4235 | * using the dst->dev. Should be impossible | |
4236 | */ | |
4237 | if (!arg.match) | |
4238 | goto out; | |
4239 | res.nh = arg.match; | |
4240 | } else { | |
4241 | res.nh = res.f6i->fib6_nh; | |
4242 | } | |
4243 | ||
7d21fec9 DA |
4244 | res.fib6_flags = res.f6i->fib6_flags; |
4245 | res.fib6_type = res.f6i->fib6_type; | |
85bd05de | 4246 | nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL); |
38308473 | 4247 | if (!nrt) |
1da177e4 LT |
4248 | goto out; |
4249 | ||
4250 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
4251 | if (on_link) | |
4252 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
4253 | ||
4e3fd7a0 | 4254 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 4255 | |
886b7a50 | 4256 | /* rt6_insert_exception() will take care of duplicated exceptions */ |
5012f0a5 | 4257 | if (rt6_insert_exception(nrt, &res)) { |
2b760fcf WW |
4258 | dst_release_immediate(&nrt->dst); |
4259 | goto out; | |
4260 | } | |
1da177e4 | 4261 | |
d8d1f30b CG |
4262 | netevent.old = &rt->dst; |
4263 | netevent.new = &nrt->dst; | |
71bcdba0 | 4264 | netevent.daddr = &msg->dest; |
60592833 | 4265 | netevent.neigh = neigh; |
8d71740c TT |
4266 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
4267 | ||
1da177e4 | 4268 | out: |
886b7a50 | 4269 | rcu_read_unlock(); |
e8599ff4 | 4270 | neigh_release(neigh); |
6e157b6a DM |
4271 | } |
4272 | ||
70ceb4f5 | 4273 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 4274 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 4275 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4276 | const struct in6_addr *gwaddr, |
4277 | struct net_device *dev) | |
70ceb4f5 | 4278 | { |
830218c1 DA |
4279 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4280 | int ifindex = dev->ifindex; | |
70ceb4f5 | 4281 | struct fib6_node *fn; |
8d1c802b | 4282 | struct fib6_info *rt = NULL; |
c71099ac TG |
4283 | struct fib6_table *table; |
4284 | ||
830218c1 | 4285 | table = fib6_get_table(net, tb_id); |
38308473 | 4286 | if (!table) |
c71099ac | 4287 | return NULL; |
70ceb4f5 | 4288 | |
66f5d6ce | 4289 | rcu_read_lock(); |
38fbeeee | 4290 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
4291 | if (!fn) |
4292 | goto out; | |
4293 | ||
66f5d6ce | 4294 | for_each_fib6_node_rt_rcu(fn) { |
f88d8ea6 DA |
4295 | /* these routes do not use nexthops */ |
4296 | if (rt->nh) | |
4297 | continue; | |
1cf844c7 | 4298 | if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex) |
70ceb4f5 | 4299 | continue; |
2b2450ca | 4300 | if (!(rt->fib6_flags & RTF_ROUTEINFO) || |
1cf844c7 | 4301 | !rt->fib6_nh->fib_nh_gw_family) |
70ceb4f5 | 4302 | continue; |
1cf844c7 | 4303 | if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr)) |
70ceb4f5 | 4304 | continue; |
e873e4b9 WW |
4305 | if (!fib6_info_hold_safe(rt)) |
4306 | continue; | |
70ceb4f5 YH |
4307 | break; |
4308 | } | |
4309 | out: | |
66f5d6ce | 4310 | rcu_read_unlock(); |
70ceb4f5 YH |
4311 | return rt; |
4312 | } | |
4313 | ||
8d1c802b | 4314 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 4315 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4316 | const struct in6_addr *gwaddr, |
4317 | struct net_device *dev, | |
95c96174 | 4318 | unsigned int pref) |
70ceb4f5 | 4319 | { |
86872cb5 | 4320 | struct fib6_config cfg = { |
238fc7ea | 4321 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 4322 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
4323 | .fc_dst_len = prefixlen, |
4324 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
4325 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 4326 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4327 | .fc_type = RTN_UNICAST, |
15e47304 | 4328 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
4329 | .fc_nlinfo.nlh = NULL, |
4330 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
4331 | }; |
4332 | ||
91b2c9a0 | 4333 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4e3fd7a0 AD |
4334 | cfg.fc_dst = *prefix; |
4335 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 4336 | |
e317da96 YH |
4337 | /* We should treat it as a default route if prefix length is 0. */ |
4338 | if (!prefixlen) | |
86872cb5 | 4339 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 4340 | |
acb54e3c | 4341 | ip6_route_add(&cfg, GFP_ATOMIC, NULL); |
70ceb4f5 | 4342 | |
830218c1 | 4343 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
4344 | } |
4345 | #endif | |
4346 | ||
8d1c802b | 4347 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 DA |
4348 | const struct in6_addr *addr, |
4349 | struct net_device *dev) | |
1ab1457c | 4350 | { |
830218c1 | 4351 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
8d1c802b | 4352 | struct fib6_info *rt; |
c71099ac | 4353 | struct fib6_table *table; |
1da177e4 | 4354 | |
afb1d4b5 | 4355 | table = fib6_get_table(net, tb_id); |
38308473 | 4356 | if (!table) |
c71099ac | 4357 | return NULL; |
1da177e4 | 4358 | |
66f5d6ce WW |
4359 | rcu_read_lock(); |
4360 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
f88d8ea6 | 4361 | struct fib6_nh *nh; |
ad1601ae | 4362 | |
f88d8ea6 DA |
4363 | /* RA routes do not use nexthops */ |
4364 | if (rt->nh) | |
4365 | continue; | |
4366 | ||
4367 | nh = rt->fib6_nh; | |
ad1601ae | 4368 | if (dev == nh->fib_nh_dev && |
93c2fb25 | 4369 | ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
ad1601ae | 4370 | ipv6_addr_equal(&nh->fib_nh_gw6, addr)) |
1da177e4 LT |
4371 | break; |
4372 | } | |
e873e4b9 WW |
4373 | if (rt && !fib6_info_hold_safe(rt)) |
4374 | rt = NULL; | |
66f5d6ce | 4375 | rcu_read_unlock(); |
1da177e4 LT |
4376 | return rt; |
4377 | } | |
4378 | ||
8d1c802b | 4379 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 4380 | const struct in6_addr *gwaddr, |
ebacaaa0 | 4381 | struct net_device *dev, |
6b2e04bc PC |
4382 | unsigned int pref, |
4383 | u32 defrtr_usr_metric) | |
1da177e4 | 4384 | { |
86872cb5 | 4385 | struct fib6_config cfg = { |
ca254490 | 4386 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
6b2e04bc | 4387 | .fc_metric = defrtr_usr_metric, |
86872cb5 TG |
4388 | .fc_ifindex = dev->ifindex, |
4389 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
4390 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 4391 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4392 | .fc_type = RTN_UNICAST, |
15e47304 | 4393 | .fc_nlinfo.portid = 0, |
5578689a | 4394 | .fc_nlinfo.nlh = NULL, |
afb1d4b5 | 4395 | .fc_nlinfo.nl_net = net, |
86872cb5 | 4396 | }; |
1da177e4 | 4397 | |
4e3fd7a0 | 4398 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 4399 | |
acb54e3c | 4400 | if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) { |
830218c1 DA |
4401 | struct fib6_table *table; |
4402 | ||
4403 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
4404 | if (table) | |
4405 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
4406 | } | |
1da177e4 | 4407 | |
afb1d4b5 | 4408 | return rt6_get_dflt_router(net, gwaddr, dev); |
1da177e4 LT |
4409 | } |
4410 | ||
afb1d4b5 DA |
4411 | static void __rt6_purge_dflt_routers(struct net *net, |
4412 | struct fib6_table *table) | |
1da177e4 | 4413 | { |
8d1c802b | 4414 | struct fib6_info *rt; |
1da177e4 LT |
4415 | |
4416 | restart: | |
66f5d6ce WW |
4417 | rcu_read_lock(); |
4418 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
dcd1f572 DA |
4419 | struct net_device *dev = fib6_info_nh_dev(rt); |
4420 | struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL; | |
4421 | ||
93c2fb25 | 4422 | if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
e873e4b9 WW |
4423 | (!idev || idev->cnf.accept_ra != 2) && |
4424 | fib6_info_hold_safe(rt)) { | |
93531c67 | 4425 | rcu_read_unlock(); |
11dd74b3 | 4426 | ip6_del_rt(net, rt, false); |
1da177e4 LT |
4427 | goto restart; |
4428 | } | |
4429 | } | |
66f5d6ce | 4430 | rcu_read_unlock(); |
830218c1 DA |
4431 | |
4432 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
4433 | } | |
4434 | ||
4435 | void rt6_purge_dflt_routers(struct net *net) | |
4436 | { | |
4437 | struct fib6_table *table; | |
4438 | struct hlist_head *head; | |
4439 | unsigned int h; | |
4440 | ||
4441 | rcu_read_lock(); | |
4442 | ||
4443 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
4444 | head = &net->ipv6.fib_table_hash[h]; | |
4445 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
4446 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
afb1d4b5 | 4447 | __rt6_purge_dflt_routers(net, table); |
830218c1 DA |
4448 | } |
4449 | } | |
4450 | ||
4451 | rcu_read_unlock(); | |
1da177e4 LT |
4452 | } |
4453 | ||
5578689a DL |
4454 | static void rtmsg_to_fib6_config(struct net *net, |
4455 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
4456 | struct fib6_config *cfg) |
4457 | { | |
8823a3ac MŻ |
4458 | *cfg = (struct fib6_config){ |
4459 | .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? | |
4460 | : RT6_TABLE_MAIN, | |
4461 | .fc_ifindex = rtmsg->rtmsg_ifindex, | |
67f69513 | 4462 | .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER, |
8823a3ac MŻ |
4463 | .fc_expires = rtmsg->rtmsg_info, |
4464 | .fc_dst_len = rtmsg->rtmsg_dst_len, | |
4465 | .fc_src_len = rtmsg->rtmsg_src_len, | |
4466 | .fc_flags = rtmsg->rtmsg_flags, | |
4467 | .fc_type = rtmsg->rtmsg_type, | |
4468 | ||
4469 | .fc_nlinfo.nl_net = net, | |
4470 | ||
4471 | .fc_dst = rtmsg->rtmsg_dst, | |
4472 | .fc_src = rtmsg->rtmsg_src, | |
4473 | .fc_gateway = rtmsg->rtmsg_gateway, | |
4474 | }; | |
86872cb5 TG |
4475 | } |
4476 | ||
7c1552da | 4477 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg) |
1da177e4 | 4478 | { |
86872cb5 | 4479 | struct fib6_config cfg; |
1da177e4 LT |
4480 | int err; |
4481 | ||
7c1552da CH |
4482 | if (cmd != SIOCADDRT && cmd != SIOCDELRT) |
4483 | return -EINVAL; | |
4484 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) | |
4485 | return -EPERM; | |
86872cb5 | 4486 | |
7c1552da | 4487 | rtmsg_to_fib6_config(net, rtmsg, &cfg); |
1da177e4 | 4488 | |
7c1552da CH |
4489 | rtnl_lock(); |
4490 | switch (cmd) { | |
4491 | case SIOCADDRT: | |
4492 | err = ip6_route_add(&cfg, GFP_KERNEL, NULL); | |
4493 | break; | |
4494 | case SIOCDELRT: | |
4495 | err = ip6_route_del(&cfg, NULL); | |
4496 | break; | |
3ff50b79 | 4497 | } |
7c1552da CH |
4498 | rtnl_unlock(); |
4499 | return err; | |
1da177e4 LT |
4500 | } |
4501 | ||
4502 | /* | |
4503 | * Drop the packet on the floor | |
4504 | */ | |
4505 | ||
d5fdd6ba | 4506 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 4507 | { |
adf30907 | 4508 | struct dst_entry *dst = skb_dst(skb); |
1d3fd8a1 SS |
4509 | struct net *net = dev_net(dst->dev); |
4510 | struct inet6_dev *idev; | |
4511 | int type; | |
4512 | ||
9c8ff951 | 4513 | if (netif_is_l3_master(skb->dev) || |
1d3fd8a1 SS |
4514 | dst->dev == net->loopback_dev) |
4515 | idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); | |
4516 | else | |
4517 | idev = ip6_dst_idev(dst); | |
4518 | ||
612f09e8 YH |
4519 | switch (ipstats_mib_noroutes) { |
4520 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 4521 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 4522 | if (type == IPV6_ADDR_ANY) { |
1d3fd8a1 | 4523 | IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
612f09e8 YH |
4524 | break; |
4525 | } | |
a8eceea8 | 4526 | fallthrough; |
612f09e8 | 4527 | case IPSTATS_MIB_OUTNOROUTES: |
1d3fd8a1 | 4528 | IP6_INC_STATS(net, idev, ipstats_mib_noroutes); |
612f09e8 YH |
4529 | break; |
4530 | } | |
1d3fd8a1 SS |
4531 | |
4532 | /* Start over by dropping the dst for l3mdev case */ | |
4533 | if (netif_is_l3_master(skb->dev)) | |
4534 | skb_dst_drop(skb); | |
4535 | ||
3ffe533c | 4536 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
4537 | kfree_skb(skb); |
4538 | return 0; | |
4539 | } | |
4540 | ||
9ce8ade0 TG |
4541 | static int ip6_pkt_discard(struct sk_buff *skb) |
4542 | { | |
612f09e8 | 4543 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4544 | } |
4545 | ||
ede2059d | 4546 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 4547 | { |
adf30907 | 4548 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4549 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
4550 | } |
4551 | ||
9ce8ade0 TG |
4552 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
4553 | { | |
612f09e8 | 4554 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4555 | } |
4556 | ||
ede2059d | 4557 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 4558 | { |
adf30907 | 4559 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4560 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
4561 | } |
4562 | ||
1da177e4 LT |
4563 | /* |
4564 | * Allocate a dst for local (unicast / anycast) address. | |
4565 | */ | |
4566 | ||
360a9887 DA |
4567 | struct fib6_info *addrconf_f6i_alloc(struct net *net, |
4568 | struct inet6_dev *idev, | |
4569 | const struct in6_addr *addr, | |
4570 | bool anycast, gfp_t gfp_flags) | |
1da177e4 | 4571 | { |
c7a1ce39 DA |
4572 | struct fib6_config cfg = { |
4573 | .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL, | |
4574 | .fc_ifindex = idev->dev->ifindex, | |
d55a2e37 | 4575 | .fc_flags = RTF_UP | RTF_NONEXTHOP, |
c7a1ce39 DA |
4576 | .fc_dst = *addr, |
4577 | .fc_dst_len = 128, | |
4578 | .fc_protocol = RTPROT_KERNEL, | |
4579 | .fc_nlinfo.nl_net = net, | |
4580 | .fc_ignore_dev_down = true, | |
4581 | }; | |
d55a2e37 | 4582 | struct fib6_info *f6i; |
1da177e4 | 4583 | |
e8478e80 | 4584 | if (anycast) { |
c7a1ce39 DA |
4585 | cfg.fc_type = RTN_ANYCAST; |
4586 | cfg.fc_flags |= RTF_ANYCAST; | |
e8478e80 | 4587 | } else { |
c7a1ce39 DA |
4588 | cfg.fc_type = RTN_LOCAL; |
4589 | cfg.fc_flags |= RTF_LOCAL; | |
e8478e80 | 4590 | } |
1da177e4 | 4591 | |
d55a2e37 | 4592 | f6i = ip6_route_info_create(&cfg, gfp_flags, NULL); |
c3d969de | 4593 | if (!IS_ERR(f6i)) { |
d55a2e37 | 4594 | f6i->dst_nocount = true; |
c3d969de ND |
4595 | |
4596 | if (!anycast && | |
4597 | (net->ipv6.devconf_all->disable_policy || | |
4598 | idev->cnf.disable_policy)) | |
4599 | f6i->dst_nopolicy = true; | |
4600 | } | |
4601 | ||
d55a2e37 | 4602 | return f6i; |
1da177e4 LT |
4603 | } |
4604 | ||
c3968a85 DW |
4605 | /* remove deleted ip from prefsrc entries */ |
4606 | struct arg_dev_net_ip { | |
4607 | struct net_device *dev; | |
4608 | struct net *net; | |
4609 | struct in6_addr *addr; | |
4610 | }; | |
4611 | ||
8d1c802b | 4612 | static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg) |
c3968a85 DW |
4613 | { |
4614 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
4615 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
4616 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
4617 | ||
f88d8ea6 DA |
4618 | if (!rt->nh && |
4619 | ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) && | |
421842ed | 4620 | rt != net->ipv6.fib6_null_entry && |
93c2fb25 | 4621 | ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) { |
60006a48 | 4622 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 | 4623 | /* remove prefsrc entry */ |
93c2fb25 | 4624 | rt->fib6_prefsrc.plen = 0; |
60006a48 | 4625 | spin_unlock_bh(&rt6_exception_lock); |
c3968a85 DW |
4626 | } |
4627 | return 0; | |
4628 | } | |
4629 | ||
4630 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
4631 | { | |
4632 | struct net *net = dev_net(ifp->idev->dev); | |
4633 | struct arg_dev_net_ip adni = { | |
4634 | .dev = ifp->idev->dev, | |
4635 | .net = net, | |
4636 | .addr = &ifp->addr, | |
4637 | }; | |
0c3584d5 | 4638 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
4639 | } |
4640 | ||
2b2450ca | 4641 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT) |
be7a010d DJ |
4642 | |
4643 | /* Remove routers and update dst entries when gateway turn into host. */ | |
8d1c802b | 4644 | static int fib6_clean_tohost(struct fib6_info *rt, void *arg) |
be7a010d DJ |
4645 | { |
4646 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
f88d8ea6 DA |
4647 | struct fib6_nh *nh; |
4648 | ||
4649 | /* RA routes do not use nexthops */ | |
4650 | if (rt->nh) | |
4651 | return 0; | |
be7a010d | 4652 | |
f88d8ea6 | 4653 | nh = rt->fib6_nh; |
93c2fb25 | 4654 | if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
cc5c073a | 4655 | nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6)) |
be7a010d | 4656 | return -1; |
b16cb459 WW |
4657 | |
4658 | /* Further clean up cached routes in exception table. | |
4659 | * This is needed because cached route may have a different | |
4660 | * gateway than its 'parent' in the case of an ip redirect. | |
4661 | */ | |
cc5c073a | 4662 | fib6_nh_exceptions_clean_tohost(nh, gateway); |
b16cb459 | 4663 | |
be7a010d DJ |
4664 | return 0; |
4665 | } | |
4666 | ||
4667 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
4668 | { | |
4669 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
4670 | } | |
4671 | ||
2127d95a IS |
4672 | struct arg_netdev_event { |
4673 | const struct net_device *dev; | |
4c981e28 | 4674 | union { |
ecc5663c | 4675 | unsigned char nh_flags; |
4c981e28 IS |
4676 | unsigned long event; |
4677 | }; | |
2127d95a IS |
4678 | }; |
4679 | ||
8d1c802b | 4680 | static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt) |
d7dedee1 | 4681 | { |
8d1c802b | 4682 | struct fib6_info *iter; |
d7dedee1 IS |
4683 | struct fib6_node *fn; |
4684 | ||
93c2fb25 DA |
4685 | fn = rcu_dereference_protected(rt->fib6_node, |
4686 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
d7dedee1 | 4687 | iter = rcu_dereference_protected(fn->leaf, |
93c2fb25 | 4688 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 | 4689 | while (iter) { |
93c2fb25 | 4690 | if (iter->fib6_metric == rt->fib6_metric && |
33bd5ac5 | 4691 | rt6_qualify_for_ecmp(iter)) |
d7dedee1 | 4692 | return iter; |
8fb11a9a | 4693 | iter = rcu_dereference_protected(iter->fib6_next, |
93c2fb25 | 4694 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 IS |
4695 | } |
4696 | ||
4697 | return NULL; | |
4698 | } | |
4699 | ||
f88d8ea6 | 4700 | /* only called for fib entries with builtin fib6_nh */ |
8d1c802b | 4701 | static bool rt6_is_dead(const struct fib6_info *rt) |
d7dedee1 | 4702 | { |
1cf844c7 DA |
4703 | if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD || |
4704 | (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
4705 | ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev))) | |
d7dedee1 IS |
4706 | return true; |
4707 | ||
4708 | return false; | |
4709 | } | |
4710 | ||
8d1c802b | 4711 | static int rt6_multipath_total_weight(const struct fib6_info *rt) |
d7dedee1 | 4712 | { |
8d1c802b | 4713 | struct fib6_info *iter; |
d7dedee1 IS |
4714 | int total = 0; |
4715 | ||
4716 | if (!rt6_is_dead(rt)) | |
1cf844c7 | 4717 | total += rt->fib6_nh->fib_nh_weight; |
d7dedee1 | 4718 | |
93c2fb25 | 4719 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { |
d7dedee1 | 4720 | if (!rt6_is_dead(iter)) |
1cf844c7 | 4721 | total += iter->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4722 | } |
4723 | ||
4724 | return total; | |
4725 | } | |
4726 | ||
8d1c802b | 4727 | static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total) |
d7dedee1 IS |
4728 | { |
4729 | int upper_bound = -1; | |
4730 | ||
4731 | if (!rt6_is_dead(rt)) { | |
1cf844c7 | 4732 | *weight += rt->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4733 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31, |
4734 | total) - 1; | |
4735 | } | |
1cf844c7 | 4736 | atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound); |
d7dedee1 IS |
4737 | } |
4738 | ||
8d1c802b | 4739 | static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total) |
d7dedee1 | 4740 | { |
8d1c802b | 4741 | struct fib6_info *iter; |
d7dedee1 IS |
4742 | int weight = 0; |
4743 | ||
4744 | rt6_upper_bound_set(rt, &weight, total); | |
4745 | ||
93c2fb25 | 4746 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
d7dedee1 IS |
4747 | rt6_upper_bound_set(iter, &weight, total); |
4748 | } | |
4749 | ||
8d1c802b | 4750 | void rt6_multipath_rebalance(struct fib6_info *rt) |
d7dedee1 | 4751 | { |
8d1c802b | 4752 | struct fib6_info *first; |
d7dedee1 IS |
4753 | int total; |
4754 | ||
4755 | /* In case the entire multipath route was marked for flushing, | |
4756 | * then there is no need to rebalance upon the removal of every | |
4757 | * sibling route. | |
4758 | */ | |
93c2fb25 | 4759 | if (!rt->fib6_nsiblings || rt->should_flush) |
d7dedee1 IS |
4760 | return; |
4761 | ||
4762 | /* During lookup routes are evaluated in order, so we need to | |
4763 | * make sure upper bounds are assigned from the first sibling | |
4764 | * onwards. | |
4765 | */ | |
4766 | first = rt6_multipath_first_sibling(rt); | |
4767 | if (WARN_ON_ONCE(!first)) | |
4768 | return; | |
4769 | ||
4770 | total = rt6_multipath_total_weight(first); | |
4771 | rt6_multipath_upper_bound_set(first, total); | |
4772 | } | |
4773 | ||
8d1c802b | 4774 | static int fib6_ifup(struct fib6_info *rt, void *p_arg) |
2127d95a IS |
4775 | { |
4776 | const struct arg_netdev_event *arg = p_arg; | |
7aef6859 | 4777 | struct net *net = dev_net(arg->dev); |
2127d95a | 4778 | |
f88d8ea6 | 4779 | if (rt != net->ipv6.fib6_null_entry && !rt->nh && |
1cf844c7 DA |
4780 | rt->fib6_nh->fib_nh_dev == arg->dev) { |
4781 | rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags; | |
7aef6859 | 4782 | fib6_update_sernum_upto_root(net, rt); |
d7dedee1 | 4783 | rt6_multipath_rebalance(rt); |
1de178ed | 4784 | } |
2127d95a IS |
4785 | |
4786 | return 0; | |
4787 | } | |
4788 | ||
ecc5663c | 4789 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags) |
2127d95a IS |
4790 | { |
4791 | struct arg_netdev_event arg = { | |
4792 | .dev = dev, | |
6802f3ad IS |
4793 | { |
4794 | .nh_flags = nh_flags, | |
4795 | }, | |
2127d95a IS |
4796 | }; |
4797 | ||
4798 | if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev)) | |
4799 | arg.nh_flags |= RTNH_F_LINKDOWN; | |
4800 | ||
4801 | fib6_clean_all(dev_net(dev), fib6_ifup, &arg); | |
4802 | } | |
4803 | ||
f88d8ea6 | 4804 | /* only called for fib entries with inline fib6_nh */ |
8d1c802b | 4805 | static bool rt6_multipath_uses_dev(const struct fib6_info *rt, |
1de178ed IS |
4806 | const struct net_device *dev) |
4807 | { | |
8d1c802b | 4808 | struct fib6_info *iter; |
1de178ed | 4809 | |
1cf844c7 | 4810 | if (rt->fib6_nh->fib_nh_dev == dev) |
1de178ed | 4811 | return true; |
93c2fb25 | 4812 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 | 4813 | if (iter->fib6_nh->fib_nh_dev == dev) |
1de178ed IS |
4814 | return true; |
4815 | ||
4816 | return false; | |
4817 | } | |
4818 | ||
8d1c802b | 4819 | static void rt6_multipath_flush(struct fib6_info *rt) |
1de178ed | 4820 | { |
8d1c802b | 4821 | struct fib6_info *iter; |
1de178ed IS |
4822 | |
4823 | rt->should_flush = 1; | |
93c2fb25 | 4824 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1de178ed IS |
4825 | iter->should_flush = 1; |
4826 | } | |
4827 | ||
8d1c802b | 4828 | static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt, |
1de178ed IS |
4829 | const struct net_device *down_dev) |
4830 | { | |
8d1c802b | 4831 | struct fib6_info *iter; |
1de178ed IS |
4832 | unsigned int dead = 0; |
4833 | ||
1cf844c7 DA |
4834 | if (rt->fib6_nh->fib_nh_dev == down_dev || |
4835 | rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed | 4836 | dead++; |
93c2fb25 | 4837 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4838 | if (iter->fib6_nh->fib_nh_dev == down_dev || |
4839 | iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed IS |
4840 | dead++; |
4841 | ||
4842 | return dead; | |
4843 | } | |
4844 | ||
8d1c802b | 4845 | static void rt6_multipath_nh_flags_set(struct fib6_info *rt, |
1de178ed | 4846 | const struct net_device *dev, |
ecc5663c | 4847 | unsigned char nh_flags) |
1de178ed | 4848 | { |
8d1c802b | 4849 | struct fib6_info *iter; |
1de178ed | 4850 | |
1cf844c7 DA |
4851 | if (rt->fib6_nh->fib_nh_dev == dev) |
4852 | rt->fib6_nh->fib_nh_flags |= nh_flags; | |
93c2fb25 | 4853 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4854 | if (iter->fib6_nh->fib_nh_dev == dev) |
4855 | iter->fib6_nh->fib_nh_flags |= nh_flags; | |
1de178ed IS |
4856 | } |
4857 | ||
a1a22c12 | 4858 | /* called with write lock held for table with rt */ |
8d1c802b | 4859 | static int fib6_ifdown(struct fib6_info *rt, void *p_arg) |
1da177e4 | 4860 | { |
4c981e28 IS |
4861 | const struct arg_netdev_event *arg = p_arg; |
4862 | const struct net_device *dev = arg->dev; | |
7aef6859 | 4863 | struct net *net = dev_net(dev); |
8ed67789 | 4864 | |
f88d8ea6 | 4865 | if (rt == net->ipv6.fib6_null_entry || rt->nh) |
27c6fa73 IS |
4866 | return 0; |
4867 | ||
4868 | switch (arg->event) { | |
4869 | case NETDEV_UNREGISTER: | |
1cf844c7 | 4870 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
27c6fa73 | 4871 | case NETDEV_DOWN: |
1de178ed | 4872 | if (rt->should_flush) |
27c6fa73 | 4873 | return -1; |
93c2fb25 | 4874 | if (!rt->fib6_nsiblings) |
1cf844c7 | 4875 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
1de178ed IS |
4876 | if (rt6_multipath_uses_dev(rt, dev)) { |
4877 | unsigned int count; | |
4878 | ||
4879 | count = rt6_multipath_dead_count(rt, dev); | |
93c2fb25 | 4880 | if (rt->fib6_nsiblings + 1 == count) { |
1de178ed IS |
4881 | rt6_multipath_flush(rt); |
4882 | return -1; | |
4883 | } | |
4884 | rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD | | |
4885 | RTNH_F_LINKDOWN); | |
7aef6859 | 4886 | fib6_update_sernum(net, rt); |
d7dedee1 | 4887 | rt6_multipath_rebalance(rt); |
1de178ed IS |
4888 | } |
4889 | return -2; | |
27c6fa73 | 4890 | case NETDEV_CHANGE: |
1cf844c7 | 4891 | if (rt->fib6_nh->fib_nh_dev != dev || |
93c2fb25 | 4892 | rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) |
27c6fa73 | 4893 | break; |
1cf844c7 | 4894 | rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
d7dedee1 | 4895 | rt6_multipath_rebalance(rt); |
27c6fa73 | 4896 | break; |
2b241361 | 4897 | } |
c159d30c | 4898 | |
1da177e4 LT |
4899 | return 0; |
4900 | } | |
4901 | ||
27c6fa73 | 4902 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event) |
1da177e4 | 4903 | { |
4c981e28 | 4904 | struct arg_netdev_event arg = { |
8ed67789 | 4905 | .dev = dev, |
6802f3ad IS |
4906 | { |
4907 | .event = event, | |
4908 | }, | |
8ed67789 | 4909 | }; |
7c6bb7d2 | 4910 | struct net *net = dev_net(dev); |
8ed67789 | 4911 | |
7c6bb7d2 DA |
4912 | if (net->ipv6.sysctl.skip_notify_on_dev_down) |
4913 | fib6_clean_all_skip_notify(net, fib6_ifdown, &arg); | |
4914 | else | |
4915 | fib6_clean_all(net, fib6_ifdown, &arg); | |
4c981e28 IS |
4916 | } |
4917 | ||
4918 | void rt6_disable_ip(struct net_device *dev, unsigned long event) | |
4919 | { | |
4920 | rt6_sync_down_dev(dev, event); | |
4921 | rt6_uncached_list_flush_dev(dev_net(dev), dev); | |
4922 | neigh_ifdown(&nd_tbl, dev); | |
1da177e4 LT |
4923 | } |
4924 | ||
95c96174 | 4925 | struct rt6_mtu_change_arg { |
1da177e4 | 4926 | struct net_device *dev; |
95c96174 | 4927 | unsigned int mtu; |
c0b220cf | 4928 | struct fib6_info *f6i; |
1da177e4 LT |
4929 | }; |
4930 | ||
cc5c073a | 4931 | static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg) |
c0b220cf DA |
4932 | { |
4933 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg; | |
cc5c073a | 4934 | struct fib6_info *f6i = arg->f6i; |
c0b220cf DA |
4935 | |
4936 | /* For administrative MTU increase, there is no way to discover | |
4937 | * IPv6 PMTU increase, so PMTU increase should be updated here. | |
4938 | * Since RFC 1981 doesn't include administrative MTU increase | |
4939 | * update PMTU increase is a MUST. (i.e. jumbo frame) | |
4940 | */ | |
4941 | if (nh->fib_nh_dev == arg->dev) { | |
4942 | struct inet6_dev *idev = __in6_dev_get(arg->dev); | |
4943 | u32 mtu = f6i->fib6_pmtu; | |
4944 | ||
4945 | if (mtu >= arg->mtu || | |
4946 | (mtu < arg->mtu && mtu == idev->cnf.mtu6)) | |
4947 | fib6_metric_set(f6i, RTAX_MTU, arg->mtu); | |
4948 | ||
4949 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 4950 | rt6_exceptions_update_pmtu(idev, nh, arg->mtu); |
c0b220cf DA |
4951 | spin_unlock_bh(&rt6_exception_lock); |
4952 | } | |
4953 | ||
4954 | return 0; | |
4955 | } | |
4956 | ||
4957 | static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg) | |
1da177e4 LT |
4958 | { |
4959 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
4960 | struct inet6_dev *idev; | |
4961 | ||
4962 | /* In IPv6 pmtu discovery is not optional, | |
4963 | so that RTAX_MTU lock cannot disable it. | |
4964 | We still use this lock to block changes | |
4965 | caused by addrconf/ndisc. | |
4966 | */ | |
4967 | ||
4968 | idev = __in6_dev_get(arg->dev); | |
38308473 | 4969 | if (!idev) |
1da177e4 LT |
4970 | return 0; |
4971 | ||
c0b220cf DA |
4972 | if (fib6_metric_locked(f6i, RTAX_MTU)) |
4973 | return 0; | |
d4ead6b3 | 4974 | |
c0b220cf | 4975 | arg->f6i = f6i; |
2d44234b DA |
4976 | if (f6i->nh) { |
4977 | /* fib6_nh_mtu_change only returns 0, so this is safe */ | |
4978 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change, | |
4979 | arg); | |
4980 | } | |
4981 | ||
1cf844c7 | 4982 | return fib6_nh_mtu_change(f6i->fib6_nh, arg); |
1da177e4 LT |
4983 | } |
4984 | ||
95c96174 | 4985 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 4986 | { |
c71099ac TG |
4987 | struct rt6_mtu_change_arg arg = { |
4988 | .dev = dev, | |
4989 | .mtu = mtu, | |
4990 | }; | |
1da177e4 | 4991 | |
0c3584d5 | 4992 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
4993 | } |
4994 | ||
ef7c79ed | 4995 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
75425657 | 4996 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
5176f91e | 4997 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
aa8f8778 | 4998 | [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 4999 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 5000 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
5001 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
5002 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 5003 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 5004 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
5005 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
5006 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 5007 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 5008 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 5009 | [RTA_MARK] = { .type = NLA_U32 }, |
aa8f8778 | 5010 | [RTA_TABLE] = { .type = NLA_U32 }, |
eacb9384 RP |
5011 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
5012 | [RTA_SPORT] = { .type = NLA_U16 }, | |
5013 | [RTA_DPORT] = { .type = NLA_U16 }, | |
5b98324e | 5014 | [RTA_NH_ID] = { .type = NLA_U32 }, |
86872cb5 TG |
5015 | }; |
5016 | ||
5017 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
5018 | struct fib6_config *cfg, |
5019 | struct netlink_ext_ack *extack) | |
1da177e4 | 5020 | { |
86872cb5 TG |
5021 | struct rtmsg *rtm; |
5022 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 5023 | unsigned int pref; |
86872cb5 | 5024 | int err; |
1da177e4 | 5025 | |
8cb08174 JB |
5026 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5027 | rtm_ipv6_policy, extack); | |
86872cb5 TG |
5028 | if (err < 0) |
5029 | goto errout; | |
1da177e4 | 5030 | |
86872cb5 TG |
5031 | err = -EINVAL; |
5032 | rtm = nlmsg_data(nlh); | |
86872cb5 | 5033 | |
84db8407 MŻ |
5034 | *cfg = (struct fib6_config){ |
5035 | .fc_table = rtm->rtm_table, | |
5036 | .fc_dst_len = rtm->rtm_dst_len, | |
5037 | .fc_src_len = rtm->rtm_src_len, | |
5038 | .fc_flags = RTF_UP, | |
5039 | .fc_protocol = rtm->rtm_protocol, | |
5040 | .fc_type = rtm->rtm_type, | |
5041 | ||
5042 | .fc_nlinfo.portid = NETLINK_CB(skb).portid, | |
5043 | .fc_nlinfo.nlh = nlh, | |
5044 | .fc_nlinfo.nl_net = sock_net(skb->sk), | |
5045 | }; | |
86872cb5 | 5046 | |
ef2c7d7b ND |
5047 | if (rtm->rtm_type == RTN_UNREACHABLE || |
5048 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
5049 | rtm->rtm_type == RTN_PROHIBIT || |
5050 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
5051 | cfg->fc_flags |= RTF_REJECT; |
5052 | ||
ab79ad14 MŻ |
5053 | if (rtm->rtm_type == RTN_LOCAL) |
5054 | cfg->fc_flags |= RTF_LOCAL; | |
5055 | ||
1f56a01f MKL |
5056 | if (rtm->rtm_flags & RTM_F_CLONED) |
5057 | cfg->fc_flags |= RTF_CACHE; | |
5058 | ||
fc1e64e1 DA |
5059 | cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK); |
5060 | ||
5b98324e DA |
5061 | if (tb[RTA_NH_ID]) { |
5062 | if (tb[RTA_GATEWAY] || tb[RTA_OIF] || | |
5063 | tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) { | |
5064 | NL_SET_ERR_MSG(extack, | |
5065 | "Nexthop specification and nexthop id are mutually exclusive"); | |
5066 | goto errout; | |
5067 | } | |
5068 | cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]); | |
5069 | } | |
5070 | ||
86872cb5 | 5071 | if (tb[RTA_GATEWAY]) { |
67b61f6c | 5072 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 5073 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 5074 | } |
e3818541 DA |
5075 | if (tb[RTA_VIA]) { |
5076 | NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute"); | |
5077 | goto errout; | |
5078 | } | |
86872cb5 TG |
5079 | |
5080 | if (tb[RTA_DST]) { | |
5081 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
5082 | ||
5083 | if (nla_len(tb[RTA_DST]) < plen) | |
5084 | goto errout; | |
5085 | ||
5086 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 5087 | } |
86872cb5 TG |
5088 | |
5089 | if (tb[RTA_SRC]) { | |
5090 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
5091 | ||
5092 | if (nla_len(tb[RTA_SRC]) < plen) | |
5093 | goto errout; | |
5094 | ||
5095 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 5096 | } |
86872cb5 | 5097 | |
c3968a85 | 5098 | if (tb[RTA_PREFSRC]) |
67b61f6c | 5099 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 5100 | |
86872cb5 TG |
5101 | if (tb[RTA_OIF]) |
5102 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
5103 | ||
5104 | if (tb[RTA_PRIORITY]) | |
5105 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
5106 | ||
5107 | if (tb[RTA_METRICS]) { | |
5108 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
5109 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 5110 | } |
86872cb5 TG |
5111 | |
5112 | if (tb[RTA_TABLE]) | |
5113 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
5114 | ||
51ebd318 ND |
5115 | if (tb[RTA_MULTIPATH]) { |
5116 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
5117 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
5118 | |
5119 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 5120 | cfg->fc_mp_len, extack); |
9ed59592 DA |
5121 | if (err < 0) |
5122 | goto errout; | |
51ebd318 ND |
5123 | } |
5124 | ||
c78ba6d6 LR |
5125 | if (tb[RTA_PREF]) { |
5126 | pref = nla_get_u8(tb[RTA_PREF]); | |
5127 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
5128 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
5129 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
5130 | cfg->fc_flags |= RTF_PREF(pref); | |
5131 | } | |
5132 | ||
19e42e45 RP |
5133 | if (tb[RTA_ENCAP]) |
5134 | cfg->fc_encap = tb[RTA_ENCAP]; | |
5135 | ||
9ed59592 | 5136 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
5137 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
5138 | ||
c255bd68 | 5139 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
5140 | if (err < 0) |
5141 | goto errout; | |
5142 | } | |
5143 | ||
32bc201e XL |
5144 | if (tb[RTA_EXPIRES]) { |
5145 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
5146 | ||
5147 | if (addrconf_finite_timeout(timeout)) { | |
5148 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
5149 | cfg->fc_flags |= RTF_EXPIRES; | |
5150 | } | |
5151 | } | |
5152 | ||
86872cb5 TG |
5153 | err = 0; |
5154 | errout: | |
5155 | return err; | |
1da177e4 LT |
5156 | } |
5157 | ||
6b9ea5a6 | 5158 | struct rt6_nh { |
8d1c802b | 5159 | struct fib6_info *fib6_info; |
6b9ea5a6 | 5160 | struct fib6_config r_cfg; |
6b9ea5a6 RP |
5161 | struct list_head next; |
5162 | }; | |
5163 | ||
d4ead6b3 DA |
5164 | static int ip6_route_info_append(struct net *net, |
5165 | struct list_head *rt6_nh_list, | |
8d1c802b DA |
5166 | struct fib6_info *rt, |
5167 | struct fib6_config *r_cfg) | |
6b9ea5a6 RP |
5168 | { |
5169 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
5170 | int err = -EEXIST; |
5171 | ||
5172 | list_for_each_entry(nh, rt6_nh_list, next) { | |
8d1c802b DA |
5173 | /* check if fib6_info already exists */ |
5174 | if (rt6_duplicate_nexthop(nh->fib6_info, rt)) | |
6b9ea5a6 RP |
5175 | return err; |
5176 | } | |
5177 | ||
5178 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
5179 | if (!nh) | |
5180 | return -ENOMEM; | |
8d1c802b | 5181 | nh->fib6_info = rt; |
6b9ea5a6 RP |
5182 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); |
5183 | list_add_tail(&nh->next, rt6_nh_list); | |
5184 | ||
5185 | return 0; | |
5186 | } | |
5187 | ||
8d1c802b DA |
5188 | static void ip6_route_mpath_notify(struct fib6_info *rt, |
5189 | struct fib6_info *rt_last, | |
3b1137fe DA |
5190 | struct nl_info *info, |
5191 | __u16 nlflags) | |
5192 | { | |
5193 | /* if this is an APPEND route, then rt points to the first route | |
5194 | * inserted and rt_last points to last route inserted. Userspace | |
5195 | * wants a consistent dump of the route which starts at the first | |
5196 | * nexthop. Since sibling routes are always added at the end of | |
5197 | * the list, find the first sibling of the last route appended | |
5198 | */ | |
93c2fb25 DA |
5199 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) { |
5200 | rt = list_first_entry(&rt_last->fib6_siblings, | |
8d1c802b | 5201 | struct fib6_info, |
93c2fb25 | 5202 | fib6_siblings); |
3b1137fe DA |
5203 | } |
5204 | ||
5205 | if (rt) | |
5206 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
5207 | } | |
5208 | ||
0ee0f47c IS |
5209 | static bool ip6_route_mpath_should_notify(const struct fib6_info *rt) |
5210 | { | |
5211 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); | |
5212 | bool should_notify = false; | |
5213 | struct fib6_info *leaf; | |
5214 | struct fib6_node *fn; | |
5215 | ||
5216 | rcu_read_lock(); | |
5217 | fn = rcu_dereference(rt->fib6_node); | |
5218 | if (!fn) | |
5219 | goto out; | |
5220 | ||
5221 | leaf = rcu_dereference(fn->leaf); | |
5222 | if (!leaf) | |
5223 | goto out; | |
5224 | ||
5225 | if (rt == leaf || | |
5226 | (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric && | |
5227 | rt6_qualify_for_ecmp(leaf))) | |
5228 | should_notify = true; | |
5229 | out: | |
5230 | rcu_read_unlock(); | |
5231 | ||
5232 | return should_notify; | |
5233 | } | |
5234 | ||
72afde41 DA |
5235 | static int fib6_gw_from_attr(struct in6_addr *gw, struct nlattr *nla, |
5236 | struct netlink_ext_ack *extack) | |
5237 | { | |
5238 | if (nla_len(nla) < sizeof(*gw)) { | |
5239 | NL_SET_ERR_MSG(extack, "Invalid IPv6 address in RTA_GATEWAY"); | |
5240 | return -EINVAL; | |
5241 | } | |
5242 | ||
5243 | *gw = nla_get_in6_addr(nla); | |
5244 | ||
5245 | return 0; | |
5246 | } | |
5247 | ||
333c4301 DA |
5248 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
5249 | struct netlink_ext_ack *extack) | |
51ebd318 | 5250 | { |
8d1c802b | 5251 | struct fib6_info *rt_notif = NULL, *rt_last = NULL; |
3b1137fe | 5252 | struct nl_info *info = &cfg->fc_nlinfo; |
51ebd318 ND |
5253 | struct fib6_config r_cfg; |
5254 | struct rtnexthop *rtnh; | |
8d1c802b | 5255 | struct fib6_info *rt; |
6b9ea5a6 RP |
5256 | struct rt6_nh *err_nh; |
5257 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 5258 | __u16 nlflags; |
51ebd318 ND |
5259 | int remaining; |
5260 | int attrlen; | |
6b9ea5a6 RP |
5261 | int err = 1; |
5262 | int nhn = 0; | |
5263 | int replace = (cfg->fc_nlinfo.nlh && | |
5264 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
5265 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 5266 | |
3b1137fe DA |
5267 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
5268 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
5269 | nlflags |= NLM_F_APPEND; | |
5270 | ||
35f1b4e9 | 5271 | remaining = cfg->fc_mp_len; |
51ebd318 | 5272 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 5273 | |
6b9ea5a6 | 5274 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
8d1c802b | 5275 | * fib6_info structs per nexthop |
6b9ea5a6 | 5276 | */ |
51ebd318 ND |
5277 | while (rtnh_ok(rtnh, remaining)) { |
5278 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5279 | if (rtnh->rtnh_ifindex) | |
5280 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5281 | ||
5282 | attrlen = rtnh_attrlen(rtnh); | |
5283 | if (attrlen > 0) { | |
5284 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5285 | ||
5286 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5287 | if (nla) { | |
2d507171 | 5288 | err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla, |
72afde41 | 5289 | extack); |
2d507171 DA |
5290 | if (err) |
5291 | goto cleanup; | |
72afde41 | 5292 | |
51ebd318 ND |
5293 | r_cfg.fc_flags |= RTF_GATEWAY; |
5294 | } | |
19e42e45 | 5295 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
aaecd4a0 DA |
5296 | |
5297 | /* RTA_ENCAP_TYPE length checked in | |
5298 | * lwtunnel_valid_encap_type_attr | |
5299 | */ | |
19e42e45 RP |
5300 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); |
5301 | if (nla) | |
5302 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 5303 | } |
6b9ea5a6 | 5304 | |
68e2ffde | 5305 | r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK); |
acb54e3c | 5306 | rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack); |
8c5b83f0 RP |
5307 | if (IS_ERR(rt)) { |
5308 | err = PTR_ERR(rt); | |
5309 | rt = NULL; | |
6b9ea5a6 | 5310 | goto cleanup; |
8c5b83f0 | 5311 | } |
b5d2d75e DA |
5312 | if (!rt6_qualify_for_ecmp(rt)) { |
5313 | err = -EINVAL; | |
5314 | NL_SET_ERR_MSG(extack, | |
5315 | "Device only routes can not be added for IPv6 using the multipath API."); | |
5316 | fib6_info_release(rt); | |
5317 | goto cleanup; | |
5318 | } | |
6b9ea5a6 | 5319 | |
1cf844c7 | 5320 | rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1; |
398958ae | 5321 | |
d4ead6b3 DA |
5322 | err = ip6_route_info_append(info->nl_net, &rt6_nh_list, |
5323 | rt, &r_cfg); | |
51ebd318 | 5324 | if (err) { |
93531c67 | 5325 | fib6_info_release(rt); |
6b9ea5a6 RP |
5326 | goto cleanup; |
5327 | } | |
5328 | ||
5329 | rtnh = rtnh_next(rtnh, &remaining); | |
5330 | } | |
5331 | ||
9eee3b49 IS |
5332 | if (list_empty(&rt6_nh_list)) { |
5333 | NL_SET_ERR_MSG(extack, | |
5334 | "Invalid nexthop configuration - no valid nexthops"); | |
5335 | return -EINVAL; | |
5336 | } | |
5337 | ||
3b1137fe DA |
5338 | /* for add and replace send one notification with all nexthops. |
5339 | * Skip the notification in fib6_add_rt2node and send one with | |
5340 | * the full route when done | |
5341 | */ | |
5342 | info->skip_notify = 1; | |
5343 | ||
ebee3cad IS |
5344 | /* For add and replace, send one notification with all nexthops. For |
5345 | * append, send one notification with all appended nexthops. | |
5346 | */ | |
5347 | info->skip_notify_kernel = 1; | |
5348 | ||
6b9ea5a6 RP |
5349 | err_nh = NULL; |
5350 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
8d1c802b DA |
5351 | err = __ip6_ins_rt(nh->fib6_info, info, extack); |
5352 | fib6_info_release(nh->fib6_info); | |
93531c67 | 5353 | |
f7225172 DA |
5354 | if (!err) { |
5355 | /* save reference to last route successfully inserted */ | |
5356 | rt_last = nh->fib6_info; | |
5357 | ||
5358 | /* save reference to first route for notification */ | |
5359 | if (!rt_notif) | |
5360 | rt_notif = nh->fib6_info; | |
5361 | } | |
3b1137fe | 5362 | |
8d1c802b DA |
5363 | /* nh->fib6_info is used or freed at this point, reset to NULL*/ |
5364 | nh->fib6_info = NULL; | |
6b9ea5a6 RP |
5365 | if (err) { |
5366 | if (replace && nhn) | |
a5a82d84 JK |
5367 | NL_SET_ERR_MSG_MOD(extack, |
5368 | "multipath route replace failed (check consistency of installed routes)"); | |
6b9ea5a6 RP |
5369 | err_nh = nh; |
5370 | goto add_errout; | |
51ebd318 | 5371 | } |
6b9ea5a6 | 5372 | |
1a72418b | 5373 | /* Because each route is added like a single route we remove |
27596472 MK |
5374 | * these flags after the first nexthop: if there is a collision, |
5375 | * we have already failed to add the first nexthop: | |
5376 | * fib6_add_rt2node() has rejected it; when replacing, old | |
5377 | * nexthops have been replaced by first new, the rest should | |
5378 | * be added to it. | |
1a72418b | 5379 | */ |
864db232 MUA |
5380 | if (cfg->fc_nlinfo.nlh) { |
5381 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | | |
5382 | NLM_F_REPLACE); | |
5383 | cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE; | |
5384 | } | |
6b9ea5a6 RP |
5385 | nhn++; |
5386 | } | |
5387 | ||
0ee0f47c IS |
5388 | /* An in-kernel notification should only be sent in case the new |
5389 | * multipath route is added as the first route in the node, or if | |
5390 | * it was appended to it. We pass 'rt_notif' since it is the first | |
5391 | * sibling and might allow us to skip some checks in the replace case. | |
5392 | */ | |
5393 | if (ip6_route_mpath_should_notify(rt_notif)) { | |
5394 | enum fib_event_type fib_event; | |
5395 | ||
5396 | if (rt_notif->fib6_nsiblings != nhn - 1) | |
5397 | fib_event = FIB_EVENT_ENTRY_APPEND; | |
5398 | else | |
caafb250 | 5399 | fib_event = FIB_EVENT_ENTRY_REPLACE; |
0ee0f47c IS |
5400 | |
5401 | err = call_fib6_multipath_entry_notifiers(info->nl_net, | |
5402 | fib_event, rt_notif, | |
5403 | nhn - 1, extack); | |
5404 | if (err) { | |
5405 | /* Delete all the siblings that were just added */ | |
5406 | err_nh = NULL; | |
5407 | goto add_errout; | |
5408 | } | |
5409 | } | |
ebee3cad | 5410 | |
3b1137fe DA |
5411 | /* success ... tell user about new route */ |
5412 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
5413 | goto cleanup; |
5414 | ||
5415 | add_errout: | |
3b1137fe DA |
5416 | /* send notification for routes that were added so that |
5417 | * the delete notifications sent by ip6_route_del are | |
5418 | * coherent | |
5419 | */ | |
5420 | if (rt_notif) | |
5421 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
5422 | ||
6b9ea5a6 RP |
5423 | /* Delete routes that were already added */ |
5424 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
5425 | if (err_nh == nh) | |
5426 | break; | |
333c4301 | 5427 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
5428 | } |
5429 | ||
5430 | cleanup: | |
5431 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
8d1c802b DA |
5432 | if (nh->fib6_info) |
5433 | fib6_info_release(nh->fib6_info); | |
6b9ea5a6 RP |
5434 | list_del(&nh->next); |
5435 | kfree(nh); | |
5436 | } | |
5437 | ||
5438 | return err; | |
5439 | } | |
5440 | ||
333c4301 DA |
5441 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
5442 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
5443 | { |
5444 | struct fib6_config r_cfg; | |
5445 | struct rtnexthop *rtnh; | |
2291267e | 5446 | int last_err = 0; |
6b9ea5a6 RP |
5447 | int remaining; |
5448 | int attrlen; | |
2291267e | 5449 | int err; |
6b9ea5a6 RP |
5450 | |
5451 | remaining = cfg->fc_mp_len; | |
5452 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
5453 | ||
5454 | /* Parse a Multipath Entry */ | |
5455 | while (rtnh_ok(rtnh, remaining)) { | |
5456 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5457 | if (rtnh->rtnh_ifindex) | |
5458 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5459 | ||
5460 | attrlen = rtnh_attrlen(rtnh); | |
5461 | if (attrlen > 0) { | |
5462 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5463 | ||
5464 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5465 | if (nla) { | |
2deb029e DA |
5466 | err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla, |
5467 | extack); | |
fac4d45f DA |
5468 | if (err) { |
5469 | last_err = err; | |
5470 | goto next_rtnh; | |
5471 | } | |
2deb029e | 5472 | |
6b9ea5a6 RP |
5473 | r_cfg.fc_flags |= RTF_GATEWAY; |
5474 | } | |
5475 | } | |
333c4301 | 5476 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
5477 | if (err) |
5478 | last_err = err; | |
5479 | ||
fac4d45f | 5480 | next_rtnh: |
51ebd318 ND |
5481 | rtnh = rtnh_next(rtnh, &remaining); |
5482 | } | |
5483 | ||
5484 | return last_err; | |
5485 | } | |
5486 | ||
c21ef3e3 DA |
5487 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5488 | struct netlink_ext_ack *extack) | |
1da177e4 | 5489 | { |
86872cb5 TG |
5490 | struct fib6_config cfg; |
5491 | int err; | |
1da177e4 | 5492 | |
333c4301 | 5493 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5494 | if (err < 0) |
5495 | return err; | |
5496 | ||
5b98324e DA |
5497 | if (cfg.fc_nh_id && |
5498 | !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) { | |
5499 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
5500 | return -EINVAL; | |
5501 | } | |
5502 | ||
51ebd318 | 5503 | if (cfg.fc_mp) |
333c4301 | 5504 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
5505 | else { |
5506 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 5507 | return ip6_route_del(&cfg, extack); |
0ae81335 | 5508 | } |
1da177e4 LT |
5509 | } |
5510 | ||
c21ef3e3 DA |
5511 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5512 | struct netlink_ext_ack *extack) | |
1da177e4 | 5513 | { |
86872cb5 TG |
5514 | struct fib6_config cfg; |
5515 | int err; | |
1da177e4 | 5516 | |
333c4301 | 5517 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5518 | if (err < 0) |
5519 | return err; | |
5520 | ||
67f69513 DA |
5521 | if (cfg.fc_metric == 0) |
5522 | cfg.fc_metric = IP6_RT_PRIO_USER; | |
5523 | ||
51ebd318 | 5524 | if (cfg.fc_mp) |
333c4301 | 5525 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 5526 | else |
acb54e3c | 5527 | return ip6_route_add(&cfg, GFP_KERNEL, extack); |
1da177e4 LT |
5528 | } |
5529 | ||
a1b7a1f0 DA |
5530 | /* add the overhead of this fib6_nh to nexthop_len */ |
5531 | static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg) | |
339bf98f | 5532 | { |
a1b7a1f0 | 5533 | int *nexthop_len = arg; |
beb1afac | 5534 | |
a1b7a1f0 DA |
5535 | *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */ |
5536 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5537 | + nla_total_size(16); /* RTA_GATEWAY */ | |
5538 | ||
5539 | if (nh->fib_nh_lws) { | |
5540 | /* RTA_ENCAP_TYPE */ | |
5541 | *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5542 | /* RTA_ENCAP */ | |
5543 | *nexthop_len += nla_total_size(2); | |
5544 | } | |
f88d8ea6 | 5545 | |
a1b7a1f0 DA |
5546 | return 0; |
5547 | } | |
beb1afac | 5548 | |
a1b7a1f0 DA |
5549 | static size_t rt6_nlmsg_size(struct fib6_info *f6i) |
5550 | { | |
5551 | int nexthop_len; | |
5552 | ||
5553 | if (f6i->nh) { | |
5554 | nexthop_len = nla_total_size(4); /* RTA_NH_ID */ | |
5555 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size, | |
5556 | &nexthop_len); | |
5557 | } else { | |
5558 | struct fib6_nh *nh = f6i->fib6_nh; | |
5559 | ||
5560 | nexthop_len = 0; | |
5561 | if (f6i->fib6_nsiblings) { | |
5562 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
5563 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5564 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5565 | + lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5566 | ||
5567 | nexthop_len *= f6i->fib6_nsiblings; | |
5568 | } | |
5569 | nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
beb1afac DA |
5570 | } |
5571 | ||
339bf98f TG |
5572 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
5573 | + nla_total_size(16) /* RTA_SRC */ | |
5574 | + nla_total_size(16) /* RTA_DST */ | |
5575 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5576 | + nla_total_size(16) /* RTA_PREFSRC */ | |
5577 | + nla_total_size(4) /* RTA_TABLE */ | |
5578 | + nla_total_size(4) /* RTA_IIF */ | |
5579 | + nla_total_size(4) /* RTA_OIF */ | |
5580 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 5581 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 5582 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 5583 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 5584 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
5585 | + nexthop_len; |
5586 | } | |
5587 | ||
f88d8ea6 DA |
5588 | static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh, |
5589 | unsigned char *flags) | |
5590 | { | |
5591 | if (nexthop_is_multipath(nh)) { | |
5592 | struct nlattr *mp; | |
5593 | ||
4255ff05 | 5594 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
f88d8ea6 DA |
5595 | if (!mp) |
5596 | goto nla_put_failure; | |
5597 | ||
7bdf4de1 | 5598 | if (nexthop_mpath_fill_node(skb, nh, AF_INET6)) |
f88d8ea6 DA |
5599 | goto nla_put_failure; |
5600 | ||
5601 | nla_nest_end(skb, mp); | |
5602 | } else { | |
5603 | struct fib6_nh *fib6_nh; | |
5604 | ||
5605 | fib6_nh = nexthop_fib6_nh(nh); | |
7bdf4de1 | 5606 | if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6, |
f88d8ea6 DA |
5607 | flags, false) < 0) |
5608 | goto nla_put_failure; | |
5609 | } | |
5610 | ||
5611 | return 0; | |
5612 | ||
5613 | nla_put_failure: | |
5614 | return -EMSGSIZE; | |
5615 | } | |
5616 | ||
d4ead6b3 | 5617 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 5618 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 5619 | struct in6_addr *dest, struct in6_addr *src, |
15e47304 | 5620 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 5621 | unsigned int flags) |
1da177e4 | 5622 | { |
22d0bd82 XL |
5623 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
5624 | struct rt6key *rt6_dst, *rt6_src; | |
5625 | u32 *pmetrics, table, rt6_flags; | |
f88d8ea6 | 5626 | unsigned char nh_flags = 0; |
2d7202bf | 5627 | struct nlmsghdr *nlh; |
22d0bd82 | 5628 | struct rtmsg *rtm; |
d4ead6b3 | 5629 | long expires = 0; |
1da177e4 | 5630 | |
15e47304 | 5631 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 5632 | if (!nlh) |
26932566 | 5633 | return -EMSGSIZE; |
2d7202bf | 5634 | |
22d0bd82 XL |
5635 | if (rt6) { |
5636 | rt6_dst = &rt6->rt6i_dst; | |
5637 | rt6_src = &rt6->rt6i_src; | |
5638 | rt6_flags = rt6->rt6i_flags; | |
5639 | } else { | |
5640 | rt6_dst = &rt->fib6_dst; | |
5641 | rt6_src = &rt->fib6_src; | |
5642 | rt6_flags = rt->fib6_flags; | |
5643 | } | |
5644 | ||
2d7202bf | 5645 | rtm = nlmsg_data(nlh); |
1da177e4 | 5646 | rtm->rtm_family = AF_INET6; |
22d0bd82 XL |
5647 | rtm->rtm_dst_len = rt6_dst->plen; |
5648 | rtm->rtm_src_len = rt6_src->plen; | |
1da177e4 | 5649 | rtm->rtm_tos = 0; |
93c2fb25 DA |
5650 | if (rt->fib6_table) |
5651 | table = rt->fib6_table->tb6_id; | |
c71099ac | 5652 | else |
9e762a4a | 5653 | table = RT6_TABLE_UNSPEC; |
97f0082a | 5654 | rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT; |
c78679e8 DM |
5655 | if (nla_put_u32(skb, RTA_TABLE, table)) |
5656 | goto nla_put_failure; | |
e8478e80 DA |
5657 | |
5658 | rtm->rtm_type = rt->fib6_type; | |
1da177e4 LT |
5659 | rtm->rtm_flags = 0; |
5660 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
93c2fb25 | 5661 | rtm->rtm_protocol = rt->fib6_protocol; |
1da177e4 | 5662 | |
22d0bd82 | 5663 | if (rt6_flags & RTF_CACHE) |
1da177e4 LT |
5664 | rtm->rtm_flags |= RTM_F_CLONED; |
5665 | ||
d4ead6b3 DA |
5666 | if (dest) { |
5667 | if (nla_put_in6_addr(skb, RTA_DST, dest)) | |
c78679e8 | 5668 | goto nla_put_failure; |
1ab1457c | 5669 | rtm->rtm_dst_len = 128; |
1da177e4 | 5670 | } else if (rtm->rtm_dst_len) |
22d0bd82 | 5671 | if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr)) |
c78679e8 | 5672 | goto nla_put_failure; |
1da177e4 LT |
5673 | #ifdef CONFIG_IPV6_SUBTREES |
5674 | if (src) { | |
930345ea | 5675 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 5676 | goto nla_put_failure; |
1ab1457c | 5677 | rtm->rtm_src_len = 128; |
c78679e8 | 5678 | } else if (rtm->rtm_src_len && |
22d0bd82 | 5679 | nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr)) |
c78679e8 | 5680 | goto nla_put_failure; |
1da177e4 | 5681 | #endif |
7bc570c8 YH |
5682 | if (iif) { |
5683 | #ifdef CONFIG_IPV6_MROUTE | |
22d0bd82 | 5684 | if (ipv6_addr_is_multicast(&rt6_dst->addr)) { |
fd61c6ba DA |
5685 | int err = ip6mr_get_route(net, skb, rtm, portid); |
5686 | ||
5687 | if (err == 0) | |
5688 | return 0; | |
5689 | if (err < 0) | |
5690 | goto nla_put_failure; | |
7bc570c8 YH |
5691 | } else |
5692 | #endif | |
c78679e8 DM |
5693 | if (nla_put_u32(skb, RTA_IIF, iif)) |
5694 | goto nla_put_failure; | |
d4ead6b3 | 5695 | } else if (dest) { |
1da177e4 | 5696 | struct in6_addr saddr_buf; |
d4ead6b3 | 5697 | if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 && |
930345ea | 5698 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5699 | goto nla_put_failure; |
1da177e4 | 5700 | } |
2d7202bf | 5701 | |
93c2fb25 | 5702 | if (rt->fib6_prefsrc.plen) { |
c3968a85 | 5703 | struct in6_addr saddr_buf; |
93c2fb25 | 5704 | saddr_buf = rt->fib6_prefsrc.addr; |
930345ea | 5705 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5706 | goto nla_put_failure; |
c3968a85 DW |
5707 | } |
5708 | ||
d4ead6b3 DA |
5709 | pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics; |
5710 | if (rtnetlink_put_metrics(skb, pmetrics) < 0) | |
2d7202bf TG |
5711 | goto nla_put_failure; |
5712 | ||
93c2fb25 | 5713 | if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric)) |
c78679e8 | 5714 | goto nla_put_failure; |
8253947e | 5715 | |
beb1afac DA |
5716 | /* For multipath routes, walk the siblings list and add |
5717 | * each as a nexthop within RTA_MULTIPATH. | |
5718 | */ | |
22d0bd82 XL |
5719 | if (rt6) { |
5720 | if (rt6_flags & RTF_GATEWAY && | |
5721 | nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway)) | |
5722 | goto nla_put_failure; | |
5723 | ||
5724 | if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex)) | |
5725 | goto nla_put_failure; | |
6b13d8f7 OH |
5726 | |
5727 | if (dst->lwtstate && | |
5728 | lwtunnel_fill_encap(skb, dst->lwtstate, RTA_ENCAP, RTA_ENCAP_TYPE) < 0) | |
5729 | goto nla_put_failure; | |
22d0bd82 | 5730 | } else if (rt->fib6_nsiblings) { |
8d1c802b | 5731 | struct fib6_info *sibling, *next_sibling; |
beb1afac DA |
5732 | struct nlattr *mp; |
5733 | ||
ae0be8de | 5734 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
beb1afac DA |
5735 | if (!mp) |
5736 | goto nla_put_failure; | |
5737 | ||
1cf844c7 | 5738 | if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common, |
597aa16c XL |
5739 | rt->fib6_nh->fib_nh_weight, AF_INET6, |
5740 | 0) < 0) | |
beb1afac DA |
5741 | goto nla_put_failure; |
5742 | ||
5743 | list_for_each_entry_safe(sibling, next_sibling, | |
93c2fb25 | 5744 | &rt->fib6_siblings, fib6_siblings) { |
1cf844c7 | 5745 | if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common, |
7bdf4de1 | 5746 | sibling->fib6_nh->fib_nh_weight, |
597aa16c | 5747 | AF_INET6, 0) < 0) |
beb1afac DA |
5748 | goto nla_put_failure; |
5749 | } | |
5750 | ||
5751 | nla_nest_end(skb, mp); | |
f88d8ea6 DA |
5752 | } else if (rt->nh) { |
5753 | if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id)) | |
5754 | goto nla_put_failure; | |
ecc5663c | 5755 | |
f88d8ea6 DA |
5756 | if (nexthop_is_blackhole(rt->nh)) |
5757 | rtm->rtm_type = RTN_BLACKHOLE; | |
5758 | ||
4f80116d RP |
5759 | if (net->ipv4.sysctl_nexthop_compat_mode && |
5760 | rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0) | |
f88d8ea6 DA |
5761 | goto nla_put_failure; |
5762 | ||
5763 | rtm->rtm_flags |= nh_flags; | |
5764 | } else { | |
7bdf4de1 | 5765 | if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6, |
ecc5663c | 5766 | &nh_flags, false) < 0) |
beb1afac | 5767 | goto nla_put_failure; |
ecc5663c DA |
5768 | |
5769 | rtm->rtm_flags |= nh_flags; | |
beb1afac DA |
5770 | } |
5771 | ||
22d0bd82 | 5772 | if (rt6_flags & RTF_EXPIRES) { |
14895687 DA |
5773 | expires = dst ? dst->expires : rt->expires; |
5774 | expires -= jiffies; | |
5775 | } | |
69cdf8f9 | 5776 | |
bb3c4ab9 | 5777 | if (!dst) { |
159f6715 | 5778 | if (READ_ONCE(rt->offload)) |
bb3c4ab9 | 5779 | rtm->rtm_flags |= RTM_F_OFFLOAD; |
159f6715 | 5780 | if (READ_ONCE(rt->trap)) |
bb3c4ab9 | 5781 | rtm->rtm_flags |= RTM_F_TRAP; |
159f6715 | 5782 | if (READ_ONCE(rt->offload_failed)) |
0c5fcf9e | 5783 | rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED; |
bb3c4ab9 IS |
5784 | } |
5785 | ||
d4ead6b3 | 5786 | if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0) |
e3703b3d | 5787 | goto nla_put_failure; |
2d7202bf | 5788 | |
22d0bd82 | 5789 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags))) |
c78ba6d6 LR |
5790 | goto nla_put_failure; |
5791 | ||
19e42e45 | 5792 | |
053c095a JB |
5793 | nlmsg_end(skb, nlh); |
5794 | return 0; | |
2d7202bf TG |
5795 | |
5796 | nla_put_failure: | |
26932566 PM |
5797 | nlmsg_cancel(skb, nlh); |
5798 | return -EMSGSIZE; | |
1da177e4 LT |
5799 | } |
5800 | ||
2c170e07 DA |
5801 | static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg) |
5802 | { | |
5803 | const struct net_device *dev = arg; | |
5804 | ||
5805 | if (nh->fib_nh_dev == dev) | |
5806 | return 1; | |
5807 | ||
5808 | return 0; | |
5809 | } | |
5810 | ||
13e38901 DA |
5811 | static bool fib6_info_uses_dev(const struct fib6_info *f6i, |
5812 | const struct net_device *dev) | |
5813 | { | |
2c170e07 DA |
5814 | if (f6i->nh) { |
5815 | struct net_device *_dev = (struct net_device *)dev; | |
5816 | ||
5817 | return !!nexthop_for_each_fib6_nh(f6i->nh, | |
5818 | fib6_info_nh_uses_dev, | |
5819 | _dev); | |
5820 | } | |
5821 | ||
1cf844c7 | 5822 | if (f6i->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5823 | return true; |
5824 | ||
5825 | if (f6i->fib6_nsiblings) { | |
5826 | struct fib6_info *sibling, *next_sibling; | |
5827 | ||
5828 | list_for_each_entry_safe(sibling, next_sibling, | |
5829 | &f6i->fib6_siblings, fib6_siblings) { | |
1cf844c7 | 5830 | if (sibling->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5831 | return true; |
5832 | } | |
5833 | } | |
5834 | ||
5835 | return false; | |
5836 | } | |
5837 | ||
1e47b483 SB |
5838 | struct fib6_nh_exception_dump_walker { |
5839 | struct rt6_rtnl_dump_arg *dump; | |
5840 | struct fib6_info *rt; | |
5841 | unsigned int flags; | |
5842 | unsigned int skip; | |
5843 | unsigned int count; | |
5844 | }; | |
5845 | ||
5846 | static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg) | |
5847 | { | |
5848 | struct fib6_nh_exception_dump_walker *w = arg; | |
5849 | struct rt6_rtnl_dump_arg *dump = w->dump; | |
5850 | struct rt6_exception_bucket *bucket; | |
5851 | struct rt6_exception *rt6_ex; | |
5852 | int i, err; | |
5853 | ||
5854 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); | |
5855 | if (!bucket) | |
5856 | return 0; | |
5857 | ||
5858 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
5859 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
5860 | if (w->skip) { | |
5861 | w->skip--; | |
5862 | continue; | |
5863 | } | |
5864 | ||
5865 | /* Expiration of entries doesn't bump sernum, insertion | |
5866 | * does. Removal is triggered by insertion, so we can | |
5867 | * rely on the fact that if entries change between two | |
5868 | * partial dumps, this node is scanned again completely, | |
5869 | * see rt6_insert_exception() and fib6_dump_table(). | |
5870 | * | |
5871 | * Count expired entries we go through as handled | |
5872 | * entries that we'll skip next time, in case of partial | |
5873 | * node dump. Otherwise, if entries expire meanwhile, | |
5874 | * we'll skip the wrong amount. | |
5875 | */ | |
5876 | if (rt6_check_expired(rt6_ex->rt6i)) { | |
5877 | w->count++; | |
5878 | continue; | |
5879 | } | |
5880 | ||
5881 | err = rt6_fill_node(dump->net, dump->skb, w->rt, | |
5882 | &rt6_ex->rt6i->dst, NULL, NULL, 0, | |
5883 | RTM_NEWROUTE, | |
5884 | NETLINK_CB(dump->cb->skb).portid, | |
5885 | dump->cb->nlh->nlmsg_seq, w->flags); | |
5886 | if (err) | |
5887 | return err; | |
5888 | ||
5889 | w->count++; | |
5890 | } | |
5891 | bucket++; | |
5892 | } | |
5893 | ||
5894 | return 0; | |
5895 | } | |
5896 | ||
bf9a8a06 | 5897 | /* Return -1 if done with node, number of handled routes on partial dump */ |
1e47b483 | 5898 | int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip) |
1da177e4 LT |
5899 | { |
5900 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
13e38901 DA |
5901 | struct fib_dump_filter *filter = &arg->filter; |
5902 | unsigned int flags = NLM_F_MULTI; | |
1f17e2f2 | 5903 | struct net *net = arg->net; |
1e47b483 | 5904 | int count = 0; |
1f17e2f2 | 5905 | |
421842ed | 5906 | if (rt == net->ipv6.fib6_null_entry) |
bf9a8a06 | 5907 | return -1; |
1da177e4 | 5908 | |
13e38901 DA |
5909 | if ((filter->flags & RTM_F_PREFIX) && |
5910 | !(rt->fib6_flags & RTF_PREFIX_RT)) { | |
5911 | /* success since this is not a prefix route */ | |
bf9a8a06 | 5912 | return -1; |
13e38901 | 5913 | } |
1e47b483 SB |
5914 | if (filter->filter_set && |
5915 | ((filter->rt_type && rt->fib6_type != filter->rt_type) || | |
5916 | (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) || | |
5917 | (filter->protocol && rt->fib6_protocol != filter->protocol))) { | |
5918 | return -1; | |
5919 | } | |
5920 | ||
5921 | if (filter->filter_set || | |
5922 | !filter->dump_routes || !filter->dump_exceptions) { | |
13e38901 | 5923 | flags |= NLM_F_DUMP_FILTERED; |
f8cfe2ce | 5924 | } |
1da177e4 | 5925 | |
1e47b483 SB |
5926 | if (filter->dump_routes) { |
5927 | if (skip) { | |
5928 | skip--; | |
5929 | } else { | |
5930 | if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, | |
5931 | 0, RTM_NEWROUTE, | |
5932 | NETLINK_CB(arg->cb->skb).portid, | |
5933 | arg->cb->nlh->nlmsg_seq, flags)) { | |
5934 | return 0; | |
5935 | } | |
5936 | count++; | |
5937 | } | |
5938 | } | |
5939 | ||
5940 | if (filter->dump_exceptions) { | |
5941 | struct fib6_nh_exception_dump_walker w = { .dump = arg, | |
5942 | .rt = rt, | |
5943 | .flags = flags, | |
5944 | .skip = skip, | |
5945 | .count = 0 }; | |
5946 | int err; | |
5947 | ||
3b525691 | 5948 | rcu_read_lock(); |
1e47b483 SB |
5949 | if (rt->nh) { |
5950 | err = nexthop_for_each_fib6_nh(rt->nh, | |
5951 | rt6_nh_dump_exceptions, | |
5952 | &w); | |
5953 | } else { | |
5954 | err = rt6_nh_dump_exceptions(rt->fib6_nh, &w); | |
5955 | } | |
3b525691 | 5956 | rcu_read_unlock(); |
1e47b483 SB |
5957 | |
5958 | if (err) | |
5959 | return count += w.count; | |
5960 | } | |
bf9a8a06 SB |
5961 | |
5962 | return -1; | |
1da177e4 LT |
5963 | } |
5964 | ||
0eff0a27 JK |
5965 | static int inet6_rtm_valid_getroute_req(struct sk_buff *skb, |
5966 | const struct nlmsghdr *nlh, | |
5967 | struct nlattr **tb, | |
5968 | struct netlink_ext_ack *extack) | |
5969 | { | |
5970 | struct rtmsg *rtm; | |
5971 | int i, err; | |
5972 | ||
5973 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
5974 | NL_SET_ERR_MSG_MOD(extack, | |
5975 | "Invalid header for get route request"); | |
5976 | return -EINVAL; | |
5977 | } | |
5978 | ||
5979 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
5980 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5981 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5982 | |
5983 | rtm = nlmsg_data(nlh); | |
5984 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || | |
5985 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || | |
5986 | rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope || | |
5987 | rtm->rtm_type) { | |
5988 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
5989 | return -EINVAL; | |
5990 | } | |
5991 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
5992 | NL_SET_ERR_MSG_MOD(extack, | |
5993 | "Invalid flags for get route request"); | |
5994 | return -EINVAL; | |
5995 | } | |
5996 | ||
8cb08174 JB |
5997 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
5998 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5999 | if (err) |
6000 | return err; | |
6001 | ||
6002 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
6003 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
6004 | NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); | |
6005 | return -EINVAL; | |
6006 | } | |
6007 | ||
6008 | for (i = 0; i <= RTA_MAX; i++) { | |
6009 | if (!tb[i]) | |
6010 | continue; | |
6011 | ||
6012 | switch (i) { | |
6013 | case RTA_SRC: | |
6014 | case RTA_DST: | |
6015 | case RTA_IIF: | |
6016 | case RTA_OIF: | |
6017 | case RTA_MARK: | |
6018 | case RTA_UID: | |
6019 | case RTA_SPORT: | |
6020 | case RTA_DPORT: | |
6021 | case RTA_IP_PROTO: | |
6022 | break; | |
6023 | default: | |
6024 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
6025 | return -EINVAL; | |
6026 | } | |
6027 | } | |
6028 | ||
6029 | return 0; | |
6030 | } | |
6031 | ||
c21ef3e3 DA |
6032 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
6033 | struct netlink_ext_ack *extack) | |
1da177e4 | 6034 | { |
3b1e0a65 | 6035 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 6036 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c | 6037 | int err, iif = 0, oif = 0; |
a68886a6 | 6038 | struct fib6_info *from; |
18c3a61c | 6039 | struct dst_entry *dst; |
ab364a6f | 6040 | struct rt6_info *rt; |
1da177e4 | 6041 | struct sk_buff *skb; |
ab364a6f | 6042 | struct rtmsg *rtm; |
744486d4 | 6043 | struct flowi6 fl6 = {}; |
18c3a61c | 6044 | bool fibmatch; |
1da177e4 | 6045 | |
0eff0a27 | 6046 | err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
ab364a6f TG |
6047 | if (err < 0) |
6048 | goto errout; | |
1da177e4 | 6049 | |
ab364a6f | 6050 | err = -EINVAL; |
38b7097b HFS |
6051 | rtm = nlmsg_data(nlh); |
6052 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 6053 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 6054 | |
ab364a6f TG |
6055 | if (tb[RTA_SRC]) { |
6056 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
6057 | goto errout; | |
6058 | ||
4e3fd7a0 | 6059 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
6060 | } |
6061 | ||
6062 | if (tb[RTA_DST]) { | |
6063 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
6064 | goto errout; | |
6065 | ||
4e3fd7a0 | 6066 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
6067 | } |
6068 | ||
6069 | if (tb[RTA_IIF]) | |
6070 | iif = nla_get_u32(tb[RTA_IIF]); | |
6071 | ||
6072 | if (tb[RTA_OIF]) | |
72331bc0 | 6073 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 6074 | |
2e47b291 LC |
6075 | if (tb[RTA_MARK]) |
6076 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
6077 | ||
622ec2c9 LC |
6078 | if (tb[RTA_UID]) |
6079 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
6080 | nla_get_u32(tb[RTA_UID])); | |
6081 | else | |
6082 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
6083 | ||
eacb9384 RP |
6084 | if (tb[RTA_SPORT]) |
6085 | fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]); | |
6086 | ||
6087 | if (tb[RTA_DPORT]) | |
6088 | fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]); | |
6089 | ||
6090 | if (tb[RTA_IP_PROTO]) { | |
6091 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea HL |
6092 | &fl6.flowi6_proto, AF_INET6, |
6093 | extack); | |
eacb9384 RP |
6094 | if (err) |
6095 | goto errout; | |
6096 | } | |
6097 | ||
1da177e4 LT |
6098 | if (iif) { |
6099 | struct net_device *dev; | |
72331bc0 SL |
6100 | int flags = 0; |
6101 | ||
121622db FW |
6102 | rcu_read_lock(); |
6103 | ||
6104 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 6105 | if (!dev) { |
121622db | 6106 | rcu_read_unlock(); |
1da177e4 | 6107 | err = -ENODEV; |
ab364a6f | 6108 | goto errout; |
1da177e4 | 6109 | } |
72331bc0 SL |
6110 | |
6111 | fl6.flowi6_iif = iif; | |
6112 | ||
6113 | if (!ipv6_addr_any(&fl6.saddr)) | |
6114 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
6115 | ||
b75cc8f9 | 6116 | dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags); |
121622db FW |
6117 | |
6118 | rcu_read_unlock(); | |
72331bc0 SL |
6119 | } else { |
6120 | fl6.flowi6_oif = oif; | |
6121 | ||
58acfd71 | 6122 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
6123 | } |
6124 | ||
18c3a61c RP |
6125 | |
6126 | rt = container_of(dst, struct rt6_info, dst); | |
6127 | if (rt->dst.error) { | |
6128 | err = rt->dst.error; | |
6129 | ip6_rt_put(rt); | |
6130 | goto errout; | |
1da177e4 LT |
6131 | } |
6132 | ||
9d6acb3b WC |
6133 | if (rt == net->ipv6.ip6_null_entry) { |
6134 | err = rt->dst.error; | |
6135 | ip6_rt_put(rt); | |
6136 | goto errout; | |
6137 | } | |
6138 | ||
ab364a6f | 6139 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 6140 | if (!skb) { |
94e187c0 | 6141 | ip6_rt_put(rt); |
ab364a6f TG |
6142 | err = -ENOBUFS; |
6143 | goto errout; | |
6144 | } | |
1da177e4 | 6145 | |
d8d1f30b | 6146 | skb_dst_set(skb, &rt->dst); |
a68886a6 DA |
6147 | |
6148 | rcu_read_lock(); | |
6149 | from = rcu_dereference(rt->from); | |
886b7a50 MKL |
6150 | if (from) { |
6151 | if (fibmatch) | |
6152 | err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, | |
6153 | iif, RTM_NEWROUTE, | |
6154 | NETLINK_CB(in_skb).portid, | |
6155 | nlh->nlmsg_seq, 0); | |
6156 | else | |
6157 | err = rt6_fill_node(net, skb, from, dst, &fl6.daddr, | |
6158 | &fl6.saddr, iif, RTM_NEWROUTE, | |
6159 | NETLINK_CB(in_skb).portid, | |
6160 | nlh->nlmsg_seq, 0); | |
6161 | } else { | |
6162 | err = -ENETUNREACH; | |
6163 | } | |
a68886a6 DA |
6164 | rcu_read_unlock(); |
6165 | ||
1da177e4 | 6166 | if (err < 0) { |
ab364a6f TG |
6167 | kfree_skb(skb); |
6168 | goto errout; | |
1da177e4 LT |
6169 | } |
6170 | ||
15e47304 | 6171 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 6172 | errout: |
1da177e4 | 6173 | return err; |
1da177e4 LT |
6174 | } |
6175 | ||
8d1c802b | 6176 | void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info, |
37a1d361 | 6177 | unsigned int nlm_flags) |
1da177e4 LT |
6178 | { |
6179 | struct sk_buff *skb; | |
5578689a | 6180 | struct net *net = info->nl_net; |
528c4ceb DL |
6181 | u32 seq; |
6182 | int err; | |
6183 | ||
6184 | err = -ENOBUFS; | |
38308473 | 6185 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 6186 | |
19e42e45 | 6187 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 6188 | if (!skb) |
21713ebc TG |
6189 | goto errout; |
6190 | ||
d4ead6b3 DA |
6191 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, |
6192 | event, info->portid, seq, nlm_flags); | |
26932566 PM |
6193 | if (err < 0) { |
6194 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6195 | WARN_ON(err == -EMSGSIZE); | |
6196 | kfree_skb(skb); | |
6197 | goto errout; | |
6198 | } | |
15e47304 | 6199 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
6200 | info->nlh, gfp_any()); |
6201 | return; | |
21713ebc TG |
6202 | errout: |
6203 | if (err < 0) | |
5578689a | 6204 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
6205 | } |
6206 | ||
19a3b7ee DA |
6207 | void fib6_rt_update(struct net *net, struct fib6_info *rt, |
6208 | struct nl_info *info) | |
6209 | { | |
6210 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
6211 | struct sk_buff *skb; | |
6212 | int err = -ENOBUFS; | |
6213 | ||
19a3b7ee DA |
6214 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
6215 | if (!skb) | |
6216 | goto errout; | |
6217 | ||
6218 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, | |
6219 | RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE); | |
6220 | if (err < 0) { | |
6221 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6222 | WARN_ON(err == -EMSGSIZE); | |
6223 | kfree_skb(skb); | |
6224 | goto errout; | |
6225 | } | |
6226 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, | |
6227 | info->nlh, gfp_any()); | |
6228 | return; | |
6229 | errout: | |
6230 | if (err < 0) | |
6231 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
6232 | } | |
6233 | ||
907eea48 | 6234 | void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i, |
0c5fcf9e | 6235 | bool offload, bool trap, bool offload_failed) |
907eea48 AC |
6236 | { |
6237 | struct sk_buff *skb; | |
6238 | int err; | |
6239 | ||
159f6715 ED |
6240 | if (READ_ONCE(f6i->offload) == offload && |
6241 | READ_ONCE(f6i->trap) == trap && | |
6242 | READ_ONCE(f6i->offload_failed) == offload_failed) | |
907eea48 AC |
6243 | return; |
6244 | ||
159f6715 ED |
6245 | WRITE_ONCE(f6i->offload, offload); |
6246 | WRITE_ONCE(f6i->trap, trap); | |
6fad361a AC |
6247 | |
6248 | /* 2 means send notifications only if offload_failed was changed. */ | |
6249 | if (net->ipv6.sysctl.fib_notify_on_flag_change == 2 && | |
159f6715 | 6250 | READ_ONCE(f6i->offload_failed) == offload_failed) |
6fad361a AC |
6251 | return; |
6252 | ||
159f6715 | 6253 | WRITE_ONCE(f6i->offload_failed, offload_failed); |
907eea48 AC |
6254 | |
6255 | if (!rcu_access_pointer(f6i->fib6_node)) | |
6256 | /* The route was removed from the tree, do not send | |
89e8347f | 6257 | * notification. |
907eea48 AC |
6258 | */ |
6259 | return; | |
6260 | ||
6261 | if (!net->ipv6.sysctl.fib_notify_on_flag_change) | |
6262 | return; | |
6263 | ||
6264 | skb = nlmsg_new(rt6_nlmsg_size(f6i), GFP_KERNEL); | |
6265 | if (!skb) { | |
6266 | err = -ENOBUFS; | |
6267 | goto errout; | |
6268 | } | |
6269 | ||
6270 | err = rt6_fill_node(net, skb, f6i, NULL, NULL, NULL, 0, RTM_NEWROUTE, 0, | |
6271 | 0, 0); | |
6272 | if (err < 0) { | |
6273 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6274 | WARN_ON(err == -EMSGSIZE); | |
6275 | kfree_skb(skb); | |
6276 | goto errout; | |
6277 | } | |
6278 | ||
6279 | rtnl_notify(skb, net, 0, RTNLGRP_IPV6_ROUTE, NULL, GFP_KERNEL); | |
6280 | return; | |
6281 | ||
6282 | errout: | |
6283 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
6284 | } | |
6285 | EXPORT_SYMBOL(fib6_info_hw_flags_set); | |
6286 | ||
8ed67789 | 6287 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 6288 | unsigned long event, void *ptr) |
8ed67789 | 6289 | { |
351638e7 | 6290 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 6291 | struct net *net = dev_net(dev); |
8ed67789 | 6292 | |
242d3a49 WC |
6293 | if (!(dev->flags & IFF_LOOPBACK)) |
6294 | return NOTIFY_OK; | |
6295 | ||
6296 | if (event == NETDEV_REGISTER) { | |
1cf844c7 | 6297 | net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev; |
d8d1f30b | 6298 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
6299 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
6300 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 6301 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 6302 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 6303 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 6304 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 6305 | #endif |
76da0704 WC |
6306 | } else if (event == NETDEV_UNREGISTER && |
6307 | dev->reg_state != NETREG_UNREGISTERED) { | |
6308 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
6309 | * netdev_wait_allrefs(). Make sure we only call this once. | |
6310 | */ | |
12d94a80 | 6311 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 6312 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
6313 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
6314 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
6315 | #endif |
6316 | } | |
6317 | ||
6318 | return NOTIFY_OK; | |
6319 | } | |
6320 | ||
1da177e4 LT |
6321 | /* |
6322 | * /proc | |
6323 | */ | |
6324 | ||
6325 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
6326 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
6327 | { | |
69ddb805 | 6328 | struct net *net = (struct net *)seq->private; |
1da177e4 | 6329 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
6330 | net->ipv6.rt6_stats->fib_nodes, |
6331 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 6332 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
6333 | net->ipv6.rt6_stats->fib_rt_entries, |
6334 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 6335 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 6336 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
6337 | |
6338 | return 0; | |
6339 | } | |
1da177e4 LT |
6340 | #endif /* CONFIG_PROC_FS */ |
6341 | ||
6342 | #ifdef CONFIG_SYSCTL | |
6343 | ||
32927393 CH |
6344 | static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
6345 | void *buffer, size_t *lenp, loff_t *ppos) | |
1da177e4 | 6346 | { |
c486da34 LAG |
6347 | struct net *net; |
6348 | int delay; | |
f0fb9b28 | 6349 | int ret; |
c486da34 | 6350 | if (!write) |
1da177e4 | 6351 | return -EINVAL; |
c486da34 LAG |
6352 | |
6353 | net = (struct net *)ctl->extra1; | |
6354 | delay = net->ipv6.sysctl.flush_delay; | |
f0fb9b28 AP |
6355 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
6356 | if (ret) | |
6357 | return ret; | |
6358 | ||
2ac3ac8f | 6359 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 6360 | return 0; |
1da177e4 LT |
6361 | } |
6362 | ||
ed792e28 | 6363 | static struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 6364 | { |
1da177e4 | 6365 | .procname = "flush", |
4990509f | 6366 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 6367 | .maxlen = sizeof(int), |
89c8b3a1 | 6368 | .mode = 0200, |
6d9f239a | 6369 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
6370 | }, |
6371 | { | |
1da177e4 | 6372 | .procname = "gc_thresh", |
9a7ec3a9 | 6373 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
6374 | .maxlen = sizeof(int), |
6375 | .mode = 0644, | |
6d9f239a | 6376 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6377 | }, |
6378 | { | |
1da177e4 | 6379 | .procname = "max_size", |
4990509f | 6380 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
6381 | .maxlen = sizeof(int), |
6382 | .mode = 0644, | |
6d9f239a | 6383 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6384 | }, |
6385 | { | |
1da177e4 | 6386 | .procname = "gc_min_interval", |
4990509f | 6387 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6388 | .maxlen = sizeof(int), |
6389 | .mode = 0644, | |
6d9f239a | 6390 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6391 | }, |
6392 | { | |
1da177e4 | 6393 | .procname = "gc_timeout", |
4990509f | 6394 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
6395 | .maxlen = sizeof(int), |
6396 | .mode = 0644, | |
6d9f239a | 6397 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6398 | }, |
6399 | { | |
1da177e4 | 6400 | .procname = "gc_interval", |
4990509f | 6401 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
6402 | .maxlen = sizeof(int), |
6403 | .mode = 0644, | |
6d9f239a | 6404 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6405 | }, |
6406 | { | |
1da177e4 | 6407 | .procname = "gc_elasticity", |
4990509f | 6408 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
6409 | .maxlen = sizeof(int), |
6410 | .mode = 0644, | |
f3d3f616 | 6411 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6412 | }, |
6413 | { | |
1da177e4 | 6414 | .procname = "mtu_expires", |
4990509f | 6415 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
6416 | .maxlen = sizeof(int), |
6417 | .mode = 0644, | |
6d9f239a | 6418 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6419 | }, |
6420 | { | |
1da177e4 | 6421 | .procname = "min_adv_mss", |
4990509f | 6422 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
6423 | .maxlen = sizeof(int), |
6424 | .mode = 0644, | |
f3d3f616 | 6425 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6426 | }, |
6427 | { | |
1da177e4 | 6428 | .procname = "gc_min_interval_ms", |
4990509f | 6429 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6430 | .maxlen = sizeof(int), |
6431 | .mode = 0644, | |
6d9f239a | 6432 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 6433 | }, |
7c6bb7d2 DA |
6434 | { |
6435 | .procname = "skip_notify_on_dev_down", | |
6436 | .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down, | |
6437 | .maxlen = sizeof(int), | |
6438 | .mode = 0644, | |
b8e8a863 | 6439 | .proc_handler = proc_dointvec_minmax, |
eec4844f MC |
6440 | .extra1 = SYSCTL_ZERO, |
6441 | .extra2 = SYSCTL_ONE, | |
7c6bb7d2 | 6442 | }, |
f8572d8f | 6443 | { } |
1da177e4 LT |
6444 | }; |
6445 | ||
2c8c1e72 | 6446 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
6447 | { |
6448 | struct ctl_table *table; | |
6449 | ||
6450 | table = kmemdup(ipv6_route_table_template, | |
6451 | sizeof(ipv6_route_table_template), | |
6452 | GFP_KERNEL); | |
5ee09105 YH |
6453 | |
6454 | if (table) { | |
6455 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 6456 | table[0].extra1 = net; |
86393e52 | 6457 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
6458 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
6459 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
6460 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
6461 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
6462 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
6463 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
6464 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 6465 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
7c6bb7d2 | 6466 | table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down; |
464dc801 EB |
6467 | |
6468 | /* Don't export sysctls to unprivileged users */ | |
6469 | if (net->user_ns != &init_user_ns) | |
6470 | table[0].procname = NULL; | |
5ee09105 YH |
6471 | } |
6472 | ||
760f2d01 DL |
6473 | return table; |
6474 | } | |
1da177e4 LT |
6475 | #endif |
6476 | ||
2c8c1e72 | 6477 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 6478 | { |
633d424b | 6479 | int ret = -ENOMEM; |
8ed67789 | 6480 | |
86393e52 AD |
6481 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
6482 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 6483 | |
fc66f95c ED |
6484 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
6485 | goto out_ip6_dst_ops; | |
6486 | ||
1cf844c7 | 6487 | net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true); |
421842ed DA |
6488 | if (!net->ipv6.fib6_null_entry) |
6489 | goto out_ip6_dst_entries; | |
1cf844c7 DA |
6490 | memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template, |
6491 | sizeof(*net->ipv6.fib6_null_entry)); | |
421842ed | 6492 | |
8ed67789 DL |
6493 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
6494 | sizeof(*net->ipv6.ip6_null_entry), | |
6495 | GFP_KERNEL); | |
6496 | if (!net->ipv6.ip6_null_entry) | |
421842ed | 6497 | goto out_fib6_null_entry; |
d8d1f30b | 6498 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6499 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
6500 | ip6_template_metrics, true); | |
74109218 | 6501 | INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached); |
8ed67789 DL |
6502 | |
6503 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 6504 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
6505 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
6506 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
6507 | GFP_KERNEL); | |
68fffc67 PZ |
6508 | if (!net->ipv6.ip6_prohibit_entry) |
6509 | goto out_ip6_null_entry; | |
d8d1f30b | 6510 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6511 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
6512 | ip6_template_metrics, true); | |
74109218 | 6513 | INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached); |
8ed67789 DL |
6514 | |
6515 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
6516 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
6517 | GFP_KERNEL); | |
68fffc67 PZ |
6518 | if (!net->ipv6.ip6_blk_hole_entry) |
6519 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 6520 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6521 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
6522 | ip6_template_metrics, true); | |
74109218 | 6523 | INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached); |
b9b33e7c PA |
6524 | #ifdef CONFIG_IPV6_SUBTREES |
6525 | net->ipv6.fib6_routes_require_src = 0; | |
6526 | #endif | |
8ed67789 DL |
6527 | #endif |
6528 | ||
b339a47c PZ |
6529 | net->ipv6.sysctl.flush_delay = 0; |
6530 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
6531 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
6532 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
6533 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
6534 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
6535 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
6536 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
7c6bb7d2 | 6537 | net->ipv6.sysctl.skip_notify_on_dev_down = 0; |
b339a47c | 6538 | |
b00798d0 | 6539 | atomic_set(&net->ipv6.ip6_rt_gc_expire, 30*HZ); |
6891a346 | 6540 | |
8ed67789 DL |
6541 | ret = 0; |
6542 | out: | |
6543 | return ret; | |
f2fc6a54 | 6544 | |
68fffc67 PZ |
6545 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
6546 | out_ip6_prohibit_entry: | |
6547 | kfree(net->ipv6.ip6_prohibit_entry); | |
6548 | out_ip6_null_entry: | |
6549 | kfree(net->ipv6.ip6_null_entry); | |
6550 | #endif | |
421842ed DA |
6551 | out_fib6_null_entry: |
6552 | kfree(net->ipv6.fib6_null_entry); | |
fc66f95c ED |
6553 | out_ip6_dst_entries: |
6554 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 6555 | out_ip6_dst_ops: |
f2fc6a54 | 6556 | goto out; |
cdb18761 DL |
6557 | } |
6558 | ||
2c8c1e72 | 6559 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 6560 | { |
421842ed | 6561 | kfree(net->ipv6.fib6_null_entry); |
8ed67789 DL |
6562 | kfree(net->ipv6.ip6_null_entry); |
6563 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6564 | kfree(net->ipv6.ip6_prohibit_entry); | |
6565 | kfree(net->ipv6.ip6_blk_hole_entry); | |
6566 | #endif | |
41bb78b4 | 6567 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
6568 | } |
6569 | ||
d189634e TG |
6570 | static int __net_init ip6_route_net_init_late(struct net *net) |
6571 | { | |
6572 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
6573 | proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops, |
6574 | sizeof(struct ipv6_route_iter)); | |
3617d949 CH |
6575 | proc_create_net_single("rt6_stats", 0444, net->proc_net, |
6576 | rt6_stats_seq_show, NULL); | |
d189634e TG |
6577 | #endif |
6578 | return 0; | |
6579 | } | |
6580 | ||
6581 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
6582 | { | |
6583 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
6584 | remove_proc_entry("ipv6_route", net->proc_net); |
6585 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
6586 | #endif |
6587 | } | |
6588 | ||
cdb18761 DL |
6589 | static struct pernet_operations ip6_route_net_ops = { |
6590 | .init = ip6_route_net_init, | |
6591 | .exit = ip6_route_net_exit, | |
6592 | }; | |
6593 | ||
c3426b47 DM |
6594 | static int __net_init ipv6_inetpeer_init(struct net *net) |
6595 | { | |
6596 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
6597 | ||
6598 | if (!bp) | |
6599 | return -ENOMEM; | |
6600 | inet_peer_base_init(bp); | |
6601 | net->ipv6.peers = bp; | |
6602 | return 0; | |
6603 | } | |
6604 | ||
6605 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
6606 | { | |
6607 | struct inet_peer_base *bp = net->ipv6.peers; | |
6608 | ||
6609 | net->ipv6.peers = NULL; | |
56a6b248 | 6610 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
6611 | kfree(bp); |
6612 | } | |
6613 | ||
2b823f72 | 6614 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
6615 | .init = ipv6_inetpeer_init, |
6616 | .exit = ipv6_inetpeer_exit, | |
6617 | }; | |
6618 | ||
d189634e TG |
6619 | static struct pernet_operations ip6_route_net_late_ops = { |
6620 | .init = ip6_route_net_init_late, | |
6621 | .exit = ip6_route_net_exit_late, | |
6622 | }; | |
6623 | ||
8ed67789 DL |
6624 | static struct notifier_block ip6_route_dev_notifier = { |
6625 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 6626 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
6627 | }; |
6628 | ||
2f460933 WC |
6629 | void __init ip6_route_init_special_entries(void) |
6630 | { | |
6631 | /* Registering of the loopback is done before this portion of code, | |
6632 | * the loopback reference in rt6_info will not be taken, do it | |
6633 | * manually for init_net */ | |
1cf844c7 | 6634 | init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev; |
2f460933 WC |
6635 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
6636 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6637 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6638 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
6639 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6640 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
6641 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6642 | #endif | |
6643 | } | |
6644 | ||
138d0be3 YS |
6645 | #if IS_BUILTIN(CONFIG_IPV6) |
6646 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6647 | DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt) | |
6648 | ||
951cf368 YS |
6649 | BTF_ID_LIST(btf_fib6_info_id) |
6650 | BTF_ID(struct, fib6_info) | |
6651 | ||
14fc6bd6 | 6652 | static const struct bpf_iter_seq_info ipv6_route_seq_info = { |
15172a46 YS |
6653 | .seq_ops = &ipv6_route_seq_ops, |
6654 | .init_seq_private = bpf_iter_init_seq_net, | |
6655 | .fini_seq_private = bpf_iter_fini_seq_net, | |
6656 | .seq_priv_size = sizeof(struct ipv6_route_iter), | |
14fc6bd6 YS |
6657 | }; |
6658 | ||
6659 | static struct bpf_iter_reg ipv6_route_reg_info = { | |
6660 | .target = "ipv6_route", | |
3c32cc1b YS |
6661 | .ctx_arg_info_size = 1, |
6662 | .ctx_arg_info = { | |
6663 | { offsetof(struct bpf_iter__ipv6_route, rt), | |
6664 | PTR_TO_BTF_ID_OR_NULL }, | |
6665 | }, | |
14fc6bd6 | 6666 | .seq_info = &ipv6_route_seq_info, |
15172a46 YS |
6667 | }; |
6668 | ||
138d0be3 YS |
6669 | static int __init bpf_iter_register(void) |
6670 | { | |
951cf368 | 6671 | ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id; |
15172a46 | 6672 | return bpf_iter_reg_target(&ipv6_route_reg_info); |
138d0be3 YS |
6673 | } |
6674 | ||
6675 | static void bpf_iter_unregister(void) | |
6676 | { | |
ab2ee4fc | 6677 | bpf_iter_unreg_target(&ipv6_route_reg_info); |
138d0be3 YS |
6678 | } |
6679 | #endif | |
6680 | #endif | |
6681 | ||
433d49c3 | 6682 | int __init ip6_route_init(void) |
1da177e4 | 6683 | { |
433d49c3 | 6684 | int ret; |
8d0b94af | 6685 | int cpu; |
433d49c3 | 6686 | |
9a7ec3a9 DL |
6687 | ret = -ENOMEM; |
6688 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 6689 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
6126891c | 6690 | SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT, NULL); |
9a7ec3a9 | 6691 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 6692 | goto out; |
14e50e57 | 6693 | |
fc66f95c | 6694 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 6695 | if (ret) |
bdb3289f | 6696 | goto out_kmem_cache; |
bdb3289f | 6697 | |
c3426b47 DM |
6698 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
6699 | if (ret) | |
e8803b6c | 6700 | goto out_dst_entries; |
2a0c451a | 6701 | |
7e52b33b DM |
6702 | ret = register_pernet_subsys(&ip6_route_net_ops); |
6703 | if (ret) | |
6704 | goto out_register_inetpeer; | |
c3426b47 | 6705 | |
5dc121e9 AE |
6706 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
6707 | ||
e8803b6c | 6708 | ret = fib6_init(); |
433d49c3 | 6709 | if (ret) |
8ed67789 | 6710 | goto out_register_subsys; |
433d49c3 | 6711 | |
433d49c3 DL |
6712 | ret = xfrm6_init(); |
6713 | if (ret) | |
e8803b6c | 6714 | goto out_fib6_init; |
c35b7e72 | 6715 | |
433d49c3 DL |
6716 | ret = fib6_rules_init(); |
6717 | if (ret) | |
6718 | goto xfrm6_init; | |
7e5449c2 | 6719 | |
d189634e TG |
6720 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
6721 | if (ret) | |
6722 | goto fib6_rules_init; | |
6723 | ||
16feebcf FW |
6724 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE, |
6725 | inet6_rtm_newroute, NULL, 0); | |
6726 | if (ret < 0) | |
6727 | goto out_register_late_subsys; | |
6728 | ||
6729 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE, | |
6730 | inet6_rtm_delroute, NULL, 0); | |
6731 | if (ret < 0) | |
6732 | goto out_register_late_subsys; | |
6733 | ||
6734 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, | |
6735 | inet6_rtm_getroute, NULL, | |
6736 | RTNL_FLAG_DOIT_UNLOCKED); | |
6737 | if (ret < 0) | |
d189634e | 6738 | goto out_register_late_subsys; |
c127ea2c | 6739 | |
8ed67789 | 6740 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 6741 | if (ret) |
d189634e | 6742 | goto out_register_late_subsys; |
8ed67789 | 6743 | |
138d0be3 YS |
6744 | #if IS_BUILTIN(CONFIG_IPV6) |
6745 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6746 | ret = bpf_iter_register(); | |
6747 | if (ret) | |
6748 | goto out_register_late_subsys; | |
6749 | #endif | |
6750 | #endif | |
6751 | ||
8d0b94af MKL |
6752 | for_each_possible_cpu(cpu) { |
6753 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
6754 | ||
6755 | INIT_LIST_HEAD(&ul->head); | |
6756 | spin_lock_init(&ul->lock); | |
6757 | } | |
6758 | ||
433d49c3 DL |
6759 | out: |
6760 | return ret; | |
6761 | ||
d189634e | 6762 | out_register_late_subsys: |
16feebcf | 6763 | rtnl_unregister_all(PF_INET6); |
d189634e | 6764 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
433d49c3 | 6765 | fib6_rules_init: |
433d49c3 DL |
6766 | fib6_rules_cleanup(); |
6767 | xfrm6_init: | |
433d49c3 | 6768 | xfrm6_fini(); |
2a0c451a TG |
6769 | out_fib6_init: |
6770 | fib6_gc_cleanup(); | |
8ed67789 DL |
6771 | out_register_subsys: |
6772 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
6773 | out_register_inetpeer: |
6774 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
6775 | out_dst_entries: |
6776 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 6777 | out_kmem_cache: |
f2fc6a54 | 6778 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 6779 | goto out; |
1da177e4 LT |
6780 | } |
6781 | ||
6782 | void ip6_route_cleanup(void) | |
6783 | { | |
138d0be3 YS |
6784 | #if IS_BUILTIN(CONFIG_IPV6) |
6785 | #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS) | |
6786 | bpf_iter_unregister(); | |
6787 | #endif | |
6788 | #endif | |
8ed67789 | 6789 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 6790 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 6791 | fib6_rules_cleanup(); |
1da177e4 | 6792 | xfrm6_fini(); |
1da177e4 | 6793 | fib6_gc_cleanup(); |
c3426b47 | 6794 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 6795 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 6796 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 6797 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 6798 | } |