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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> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
904af04d | 54 | #include <net/dst_metadata.h> |
1da177e4 | 55 | #include <net/xfrm.h> |
8d71740c | 56 | #include <net/netevent.h> |
21713ebc | 57 | #include <net/netlink.h> |
3c618c1d | 58 | #include <net/rtnh.h> |
19e42e45 | 59 | #include <net/lwtunnel.h> |
904af04d | 60 | #include <net/ip_tunnels.h> |
ca254490 | 61 | #include <net/l3mdev.h> |
eacb9384 | 62 | #include <net/ip.h> |
7c0f6ba6 | 63 | #include <linux/uaccess.h> |
1da177e4 LT |
64 | |
65 | #ifdef CONFIG_SYSCTL | |
66 | #include <linux/sysctl.h> | |
67 | #endif | |
68 | ||
30d444d3 DA |
69 | static int ip6_rt_type_to_error(u8 fib6_type); |
70 | ||
71 | #define CREATE_TRACE_POINTS | |
72 | #include <trace/events/fib6.h> | |
73 | EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup); | |
74 | #undef CREATE_TRACE_POINTS | |
75 | ||
afc154e9 | 76 | enum rt6_nud_state { |
7e980569 JB |
77 | RT6_NUD_FAIL_HARD = -3, |
78 | RT6_NUD_FAIL_PROBE = -2, | |
79 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
80 | RT6_NUD_SUCCEED = 1 |
81 | }; | |
82 | ||
1da177e4 | 83 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 84 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 85 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
86 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
87 | static void ip6_dst_destroy(struct dst_entry *); | |
88 | static void ip6_dst_ifdown(struct dst_entry *, | |
89 | struct net_device *dev, int how); | |
569d3645 | 90 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
91 | |
92 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 93 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 94 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 95 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 96 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 | 97 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
98 | struct sk_buff *skb, u32 mtu, |
99 | bool confirm_neigh); | |
6700c270 DM |
100 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, |
101 | struct sk_buff *skb); | |
702cea56 DA |
102 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
103 | int strict); | |
a1b7a1f0 | 104 | static size_t rt6_nlmsg_size(struct fib6_info *f6i); |
d4ead6b3 | 105 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 106 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 107 | struct in6_addr *dest, struct in6_addr *src, |
16a16cd3 DA |
108 | int iif, int type, u32 portid, u32 seq, |
109 | unsigned int flags); | |
7e4b5128 | 110 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
111 | const struct in6_addr *daddr, |
112 | const struct in6_addr *saddr); | |
1da177e4 | 113 | |
70ceb4f5 | 114 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 115 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 116 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
117 | const struct in6_addr *gwaddr, |
118 | struct net_device *dev, | |
95c96174 | 119 | unsigned int pref); |
8d1c802b | 120 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 121 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
122 | const struct in6_addr *gwaddr, |
123 | struct net_device *dev); | |
70ceb4f5 YH |
124 | #endif |
125 | ||
8d0b94af MKL |
126 | struct uncached_list { |
127 | spinlock_t lock; | |
128 | struct list_head head; | |
129 | }; | |
130 | ||
131 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
132 | ||
510c321b | 133 | void rt6_uncached_list_add(struct rt6_info *rt) |
8d0b94af MKL |
134 | { |
135 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
136 | ||
8d0b94af MKL |
137 | rt->rt6i_uncached_list = ul; |
138 | ||
139 | spin_lock_bh(&ul->lock); | |
140 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
141 | spin_unlock_bh(&ul->lock); | |
142 | } | |
143 | ||
510c321b | 144 | void rt6_uncached_list_del(struct rt6_info *rt) |
8d0b94af MKL |
145 | { |
146 | if (!list_empty(&rt->rt6i_uncached)) { | |
147 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
81eb8447 | 148 | struct net *net = dev_net(rt->dst.dev); |
8d0b94af MKL |
149 | |
150 | spin_lock_bh(&ul->lock); | |
151 | list_del(&rt->rt6i_uncached); | |
81eb8447 | 152 | atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache); |
8d0b94af MKL |
153 | spin_unlock_bh(&ul->lock); |
154 | } | |
155 | } | |
156 | ||
157 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
158 | { | |
159 | struct net_device *loopback_dev = net->loopback_dev; | |
160 | int cpu; | |
161 | ||
e332bc67 EB |
162 | if (dev == loopback_dev) |
163 | return; | |
164 | ||
8d0b94af MKL |
165 | for_each_possible_cpu(cpu) { |
166 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
167 | struct rt6_info *rt; | |
168 | ||
169 | spin_lock_bh(&ul->lock); | |
170 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
171 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
172 | struct net_device *rt_dev = rt->dst.dev; | |
173 | ||
e332bc67 | 174 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
175 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
176 | in6_dev_put(rt_idev); | |
177 | } | |
178 | ||
e332bc67 | 179 | if (rt_dev == dev) { |
8d7017fd | 180 | rt->dst.dev = blackhole_netdev; |
8d0b94af MKL |
181 | dev_hold(rt->dst.dev); |
182 | dev_put(rt_dev); | |
183 | } | |
184 | } | |
185 | spin_unlock_bh(&ul->lock); | |
186 | } | |
187 | } | |
188 | ||
f8a1b43b | 189 | static inline const void *choose_neigh_daddr(const struct in6_addr *p, |
f894cbf8 DM |
190 | struct sk_buff *skb, |
191 | const void *daddr) | |
39232973 | 192 | { |
a7563f34 | 193 | if (!ipv6_addr_any(p)) |
39232973 | 194 | return (const void *) p; |
f894cbf8 DM |
195 | else if (skb) |
196 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
197 | return daddr; |
198 | } | |
199 | ||
f8a1b43b DA |
200 | struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw, |
201 | struct net_device *dev, | |
202 | struct sk_buff *skb, | |
203 | const void *daddr) | |
d3aaeb38 | 204 | { |
39232973 DM |
205 | struct neighbour *n; |
206 | ||
f8a1b43b DA |
207 | daddr = choose_neigh_daddr(gw, skb, daddr); |
208 | n = __ipv6_neigh_lookup(dev, daddr); | |
f83c7790 DM |
209 | if (n) |
210 | return n; | |
7adf3246 SB |
211 | |
212 | n = neigh_create(&nd_tbl, daddr, dev); | |
213 | return IS_ERR(n) ? NULL : n; | |
f8a1b43b DA |
214 | } |
215 | ||
216 | static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst, | |
217 | struct sk_buff *skb, | |
218 | const void *daddr) | |
219 | { | |
220 | const struct rt6_info *rt = container_of(dst, struct rt6_info, dst); | |
221 | ||
2c6b55f4 ND |
222 | return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any), |
223 | dst->dev, skb, daddr); | |
f83c7790 DM |
224 | } |
225 | ||
63fca65d JA |
226 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
227 | { | |
228 | struct net_device *dev = dst->dev; | |
229 | struct rt6_info *rt = (struct rt6_info *)dst; | |
230 | ||
cbfd6891 | 231 | daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr); |
63fca65d JA |
232 | if (!daddr) |
233 | return; | |
234 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
235 | return; | |
236 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
237 | return; | |
238 | __ipv6_confirm_neigh(dev, daddr); | |
239 | } | |
240 | ||
9a7ec3a9 | 241 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 242 | .family = AF_INET6, |
1da177e4 LT |
243 | .gc = ip6_dst_gc, |
244 | .gc_thresh = 1024, | |
245 | .check = ip6_dst_check, | |
0dbaee3b | 246 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 247 | .mtu = ip6_mtu, |
d4ead6b3 | 248 | .cow_metrics = dst_cow_metrics_generic, |
1da177e4 LT |
249 | .destroy = ip6_dst_destroy, |
250 | .ifdown = ip6_dst_ifdown, | |
251 | .negative_advice = ip6_negative_advice, | |
252 | .link_failure = ip6_link_failure, | |
253 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 254 | .redirect = rt6_do_redirect, |
9f8955cc | 255 | .local_out = __ip6_local_out, |
f8a1b43b | 256 | .neigh_lookup = ip6_dst_neigh_lookup, |
63fca65d | 257 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
258 | }; |
259 | ||
ebb762f2 | 260 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 261 | { |
618f9bc7 SK |
262 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
263 | ||
264 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
265 | } |
266 | ||
6700c270 | 267 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
268 | struct sk_buff *skb, u32 mtu, |
269 | bool confirm_neigh) | |
14e50e57 DM |
270 | { |
271 | } | |
272 | ||
6700c270 DM |
273 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
274 | struct sk_buff *skb) | |
b587ee3b DM |
275 | { |
276 | } | |
277 | ||
14e50e57 DM |
278 | static struct dst_ops ip6_dst_blackhole_ops = { |
279 | .family = AF_INET6, | |
14e50e57 DM |
280 | .destroy = ip6_dst_destroy, |
281 | .check = ip6_dst_check, | |
ebb762f2 | 282 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 283 | .default_advmss = ip6_default_advmss, |
14e50e57 | 284 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 285 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 286 | .cow_metrics = dst_cow_metrics_generic, |
f8a1b43b | 287 | .neigh_lookup = ip6_dst_neigh_lookup, |
14e50e57 DM |
288 | }; |
289 | ||
62fa8a84 | 290 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 291 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
292 | }; |
293 | ||
8d1c802b | 294 | static const struct fib6_info fib6_null_entry_template = { |
93c2fb25 DA |
295 | .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP), |
296 | .fib6_protocol = RTPROT_KERNEL, | |
297 | .fib6_metric = ~(u32)0, | |
f05713e0 | 298 | .fib6_ref = REFCOUNT_INIT(1), |
421842ed DA |
299 | .fib6_type = RTN_UNREACHABLE, |
300 | .fib6_metrics = (struct dst_metrics *)&dst_default_metrics, | |
301 | }; | |
302 | ||
fb0af4c7 | 303 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
304 | .dst = { |
305 | .__refcnt = ATOMIC_INIT(1), | |
306 | .__use = 1, | |
2c20cbd7 | 307 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 308 | .error = -ENETUNREACH, |
d8d1f30b CG |
309 | .input = ip6_pkt_discard, |
310 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
311 | }, |
312 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
1da177e4 LT |
313 | }; |
314 | ||
101367c2 TG |
315 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
316 | ||
fb0af4c7 | 317 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
318 | .dst = { |
319 | .__refcnt = ATOMIC_INIT(1), | |
320 | .__use = 1, | |
2c20cbd7 | 321 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 322 | .error = -EACCES, |
d8d1f30b CG |
323 | .input = ip6_pkt_prohibit, |
324 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
325 | }, |
326 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
327 | }; |
328 | ||
fb0af4c7 | 329 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
330 | .dst = { |
331 | .__refcnt = ATOMIC_INIT(1), | |
332 | .__use = 1, | |
2c20cbd7 | 333 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 334 | .error = -EINVAL, |
d8d1f30b | 335 | .input = dst_discard, |
ede2059d | 336 | .output = dst_discard_out, |
101367c2 TG |
337 | }, |
338 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
101367c2 TG |
339 | }; |
340 | ||
341 | #endif | |
342 | ||
ebfa45f0 MKL |
343 | static void rt6_info_init(struct rt6_info *rt) |
344 | { | |
345 | struct dst_entry *dst = &rt->dst; | |
346 | ||
347 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
ebfa45f0 MKL |
348 | INIT_LIST_HEAD(&rt->rt6i_uncached); |
349 | } | |
350 | ||
1da177e4 | 351 | /* allocate dst with ip6_dst_ops */ |
93531c67 DA |
352 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
353 | int flags) | |
1da177e4 | 354 | { |
97bab73f | 355 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
b2a9c0ed | 356 | 1, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 357 | |
81eb8447 | 358 | if (rt) { |
ebfa45f0 | 359 | rt6_info_init(rt); |
81eb8447 WW |
360 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
361 | } | |
8104891b | 362 | |
cf911662 | 363 | return rt; |
1da177e4 | 364 | } |
9ab179d8 | 365 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 366 | |
1da177e4 LT |
367 | static void ip6_dst_destroy(struct dst_entry *dst) |
368 | { | |
369 | struct rt6_info *rt = (struct rt6_info *)dst; | |
a68886a6 | 370 | struct fib6_info *from; |
8d0b94af | 371 | struct inet6_dev *idev; |
1da177e4 | 372 | |
1620a336 | 373 | ip_dst_metrics_put(dst); |
8d0b94af MKL |
374 | rt6_uncached_list_del(rt); |
375 | ||
376 | idev = rt->rt6i_idev; | |
38308473 | 377 | if (idev) { |
1da177e4 LT |
378 | rt->rt6i_idev = NULL; |
379 | in6_dev_put(idev); | |
1ab1457c | 380 | } |
1716a961 | 381 | |
0e233874 | 382 | from = xchg((__force struct fib6_info **)&rt->from, NULL); |
93531c67 | 383 | fib6_info_release(from); |
b3419363 DM |
384 | } |
385 | ||
1da177e4 LT |
386 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
387 | int how) | |
388 | { | |
389 | struct rt6_info *rt = (struct rt6_info *)dst; | |
390 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 391 | struct net_device *loopback_dev = |
c346dca1 | 392 | dev_net(dev)->loopback_dev; |
1da177e4 | 393 | |
e5645f51 WW |
394 | if (idev && idev->dev != loopback_dev) { |
395 | struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev); | |
396 | if (loopback_idev) { | |
397 | rt->rt6i_idev = loopback_idev; | |
398 | in6_dev_put(idev); | |
97cac082 | 399 | } |
1da177e4 LT |
400 | } |
401 | } | |
402 | ||
5973fb1e MKL |
403 | static bool __rt6_check_expired(const struct rt6_info *rt) |
404 | { | |
405 | if (rt->rt6i_flags & RTF_EXPIRES) | |
406 | return time_after(jiffies, rt->dst.expires); | |
407 | else | |
408 | return false; | |
409 | } | |
410 | ||
a50feda5 | 411 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 412 | { |
a68886a6 DA |
413 | struct fib6_info *from; |
414 | ||
415 | from = rcu_dereference(rt->from); | |
416 | ||
1716a961 G |
417 | if (rt->rt6i_flags & RTF_EXPIRES) { |
418 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 419 | return true; |
a68886a6 | 420 | } else if (from) { |
1e2ea8ad | 421 | return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK || |
a68886a6 | 422 | fib6_check_expired(from); |
1716a961 | 423 | } |
a50feda5 | 424 | return false; |
1da177e4 LT |
425 | } |
426 | ||
b1d40991 DA |
427 | void fib6_select_path(const struct net *net, struct fib6_result *res, |
428 | struct flowi6 *fl6, int oif, bool have_oif_match, | |
429 | const struct sk_buff *skb, int strict) | |
51ebd318 | 430 | { |
8d1c802b | 431 | struct fib6_info *sibling, *next_sibling; |
b1d40991 DA |
432 | struct fib6_info *match = res->f6i; |
433 | ||
f88d8ea6 | 434 | if ((!match->fib6_nsiblings && !match->nh) || have_oif_match) |
b1d40991 | 435 | goto out; |
51ebd318 | 436 | |
b673d6cc JS |
437 | /* We might have already computed the hash for ICMPv6 errors. In such |
438 | * case it will always be non-zero. Otherwise now is the time to do it. | |
439 | */ | |
f88d8ea6 DA |
440 | if (!fl6->mp_hash && |
441 | (!match->nh || nexthop_is_multipath(match->nh))) | |
b4bac172 | 442 | fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL); |
b673d6cc | 443 | |
f88d8ea6 DA |
444 | if (unlikely(match->nh)) { |
445 | nexthop_path_fib6_result(res, fl6->mp_hash); | |
446 | return; | |
447 | } | |
448 | ||
1cf844c7 | 449 | if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound)) |
b1d40991 | 450 | goto out; |
3d709f69 | 451 | |
93c2fb25 DA |
452 | list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings, |
453 | fib6_siblings) { | |
1cf844c7 | 454 | const struct fib6_nh *nh = sibling->fib6_nh; |
5e670d84 DA |
455 | int nh_upper_bound; |
456 | ||
702cea56 | 457 | nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound); |
5e670d84 | 458 | if (fl6->mp_hash > nh_upper_bound) |
3d709f69 | 459 | continue; |
702cea56 | 460 | if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0) |
3d709f69 IS |
461 | break; |
462 | match = sibling; | |
463 | break; | |
464 | } | |
465 | ||
b1d40991 DA |
466 | out: |
467 | res->f6i = match; | |
1cf844c7 | 468 | res->nh = match->fib6_nh; |
51ebd318 ND |
469 | } |
470 | ||
1da177e4 | 471 | /* |
66f5d6ce | 472 | * Route lookup. rcu_read_lock() should be held. |
1da177e4 LT |
473 | */ |
474 | ||
0c59d006 DA |
475 | static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh, |
476 | const struct in6_addr *saddr, int oif, int flags) | |
477 | { | |
478 | const struct net_device *dev; | |
479 | ||
480 | if (nh->fib_nh_flags & RTNH_F_DEAD) | |
481 | return false; | |
482 | ||
483 | dev = nh->fib_nh_dev; | |
484 | if (oif) { | |
485 | if (dev->ifindex == oif) | |
486 | return true; | |
487 | } else { | |
488 | if (ipv6_chk_addr(net, saddr, dev, | |
489 | flags & RT6_LOOKUP_F_IFACE)) | |
490 | return true; | |
491 | } | |
492 | ||
493 | return false; | |
494 | } | |
495 | ||
962b6803 DA |
496 | struct fib6_nh_dm_arg { |
497 | struct net *net; | |
498 | const struct in6_addr *saddr; | |
499 | int oif; | |
500 | int flags; | |
501 | struct fib6_nh *nh; | |
502 | }; | |
503 | ||
504 | static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg) | |
505 | { | |
506 | struct fib6_nh_dm_arg *arg = _arg; | |
507 | ||
508 | arg->nh = nh; | |
509 | return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif, | |
510 | arg->flags); | |
511 | } | |
512 | ||
513 | /* returns fib6_nh from nexthop or NULL */ | |
514 | static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh, | |
515 | struct fib6_result *res, | |
516 | const struct in6_addr *saddr, | |
517 | int oif, int flags) | |
518 | { | |
519 | struct fib6_nh_dm_arg arg = { | |
520 | .net = net, | |
521 | .saddr = saddr, | |
522 | .oif = oif, | |
523 | .flags = flags, | |
524 | }; | |
525 | ||
526 | if (nexthop_is_blackhole(nh)) | |
527 | return NULL; | |
528 | ||
529 | if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg)) | |
530 | return arg.nh; | |
531 | ||
532 | return NULL; | |
533 | } | |
534 | ||
75ef7389 DA |
535 | static void rt6_device_match(struct net *net, struct fib6_result *res, |
536 | const struct in6_addr *saddr, int oif, int flags) | |
1da177e4 | 537 | { |
75ef7389 DA |
538 | struct fib6_info *f6i = res->f6i; |
539 | struct fib6_info *spf6i; | |
540 | struct fib6_nh *nh; | |
1da177e4 | 541 | |
75ef7389 | 542 | if (!oif && ipv6_addr_any(saddr)) { |
f88d8ea6 DA |
543 | if (unlikely(f6i->nh)) { |
544 | nh = nexthop_fib6_nh(f6i->nh); | |
545 | if (nexthop_is_blackhole(f6i->nh)) | |
546 | goto out_blackhole; | |
547 | } else { | |
548 | nh = f6i->fib6_nh; | |
549 | } | |
7d21fec9 DA |
550 | if (!(nh->fib_nh_flags & RTNH_F_DEAD)) |
551 | goto out; | |
75ef7389 | 552 | } |
dd3abc4e | 553 | |
75ef7389 | 554 | for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) { |
962b6803 DA |
555 | bool matched = false; |
556 | ||
557 | if (unlikely(spf6i->nh)) { | |
558 | nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr, | |
559 | oif, flags); | |
560 | if (nh) | |
561 | matched = true; | |
562 | } else { | |
563 | nh = spf6i->fib6_nh; | |
564 | if (__rt6_device_match(net, nh, saddr, oif, flags)) | |
565 | matched = true; | |
566 | } | |
567 | if (matched) { | |
75ef7389 | 568 | res->f6i = spf6i; |
7d21fec9 | 569 | goto out; |
75ef7389 | 570 | } |
dd3abc4e | 571 | } |
1da177e4 | 572 | |
75ef7389 DA |
573 | if (oif && flags & RT6_LOOKUP_F_IFACE) { |
574 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 575 | nh = res->f6i->fib6_nh; |
7d21fec9 | 576 | goto out; |
75ef7389 | 577 | } |
8067bb8c | 578 | |
f88d8ea6 DA |
579 | if (unlikely(f6i->nh)) { |
580 | nh = nexthop_fib6_nh(f6i->nh); | |
581 | if (nexthop_is_blackhole(f6i->nh)) | |
582 | goto out_blackhole; | |
583 | } else { | |
584 | nh = f6i->fib6_nh; | |
585 | } | |
586 | ||
7d21fec9 | 587 | if (nh->fib_nh_flags & RTNH_F_DEAD) { |
75ef7389 | 588 | res->f6i = net->ipv6.fib6_null_entry; |
1cf844c7 | 589 | nh = res->f6i->fib6_nh; |
75ef7389 | 590 | } |
7d21fec9 DA |
591 | out: |
592 | res->nh = nh; | |
593 | res->fib6_type = res->f6i->fib6_type; | |
594 | res->fib6_flags = res->f6i->fib6_flags; | |
f88d8ea6 DA |
595 | return; |
596 | ||
597 | out_blackhole: | |
598 | res->fib6_flags |= RTF_REJECT; | |
599 | res->fib6_type = RTN_BLACKHOLE; | |
600 | res->nh = nh; | |
1da177e4 LT |
601 | } |
602 | ||
27097255 | 603 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
604 | struct __rt6_probe_work { |
605 | struct work_struct work; | |
606 | struct in6_addr target; | |
607 | struct net_device *dev; | |
608 | }; | |
609 | ||
610 | static void rt6_probe_deferred(struct work_struct *w) | |
611 | { | |
612 | struct in6_addr mcaddr; | |
613 | struct __rt6_probe_work *work = | |
614 | container_of(w, struct __rt6_probe_work, work); | |
615 | ||
616 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 617 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 618 | dev_put(work->dev); |
662f5533 | 619 | kfree(work); |
c2f17e82 HFS |
620 | } |
621 | ||
cc3a86c8 | 622 | static void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 623 | { |
f547fac6 | 624 | struct __rt6_probe_work *work = NULL; |
5e670d84 | 625 | const struct in6_addr *nh_gw; |
1bef4c22 | 626 | unsigned long last_probe; |
f2c31e32 | 627 | struct neighbour *neigh; |
5e670d84 | 628 | struct net_device *dev; |
f547fac6 | 629 | struct inet6_dev *idev; |
5e670d84 | 630 | |
27097255 YH |
631 | /* |
632 | * Okay, this does not seem to be appropriate | |
633 | * for now, however, we need to check if it | |
634 | * is really so; aka Router Reachability Probing. | |
635 | * | |
636 | * Router Reachability Probe MUST be rate-limited | |
637 | * to no more than one per minute. | |
638 | */ | |
004b3942 | 639 | if (!fib6_nh->fib_nh_gw_family) |
7ff74a59 | 640 | return; |
5e670d84 | 641 | |
cc3a86c8 DA |
642 | nh_gw = &fib6_nh->fib_nh_gw6; |
643 | dev = fib6_nh->fib_nh_dev; | |
2152caea | 644 | rcu_read_lock_bh(); |
1bef4c22 | 645 | last_probe = READ_ONCE(fib6_nh->last_probe); |
f547fac6 | 646 | idev = __in6_dev_get(dev); |
5e670d84 | 647 | neigh = __ipv6_neigh_lookup_noref(dev, nh_gw); |
2152caea | 648 | if (neigh) { |
8d6c31bf MKL |
649 | if (neigh->nud_state & NUD_VALID) |
650 | goto out; | |
651 | ||
2152caea | 652 | write_lock(&neigh->lock); |
990edb42 MKL |
653 | if (!(neigh->nud_state & NUD_VALID) && |
654 | time_after(jiffies, | |
dcd1f572 | 655 | neigh->updated + idev->cnf.rtr_probe_interval)) { |
990edb42 MKL |
656 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
657 | if (work) | |
658 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 659 | } |
2152caea | 660 | write_unlock(&neigh->lock); |
1bef4c22 | 661 | } else if (time_after(jiffies, last_probe + |
f547fac6 | 662 | idev->cnf.rtr_probe_interval)) { |
990edb42 | 663 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
f2c31e32 | 664 | } |
990edb42 | 665 | |
1bef4c22 ED |
666 | if (!work || cmpxchg(&fib6_nh->last_probe, |
667 | last_probe, jiffies) != last_probe) { | |
668 | kfree(work); | |
669 | } else { | |
990edb42 | 670 | INIT_WORK(&work->work, rt6_probe_deferred); |
5e670d84 DA |
671 | work->target = *nh_gw; |
672 | dev_hold(dev); | |
673 | work->dev = dev; | |
990edb42 MKL |
674 | schedule_work(&work->work); |
675 | } | |
676 | ||
8d6c31bf | 677 | out: |
2152caea | 678 | rcu_read_unlock_bh(); |
27097255 YH |
679 | } |
680 | #else | |
cc3a86c8 | 681 | static inline void rt6_probe(struct fib6_nh *fib6_nh) |
27097255 | 682 | { |
27097255 YH |
683 | } |
684 | #endif | |
685 | ||
1da177e4 | 686 | /* |
554cfb7e | 687 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 688 | */ |
1ba9a895 | 689 | static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh) |
1da177e4 | 690 | { |
afc154e9 | 691 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
5e670d84 | 692 | struct neighbour *neigh; |
f2c31e32 | 693 | |
145a3621 | 694 | rcu_read_lock_bh(); |
1ba9a895 DA |
695 | neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev, |
696 | &fib6_nh->fib_nh_gw6); | |
145a3621 YH |
697 | if (neigh) { |
698 | read_lock(&neigh->lock); | |
554cfb7e | 699 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 700 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 701 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 702 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 703 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
704 | else |
705 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 706 | #endif |
145a3621 | 707 | read_unlock(&neigh->lock); |
afc154e9 HFS |
708 | } else { |
709 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 710 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 711 | } |
145a3621 YH |
712 | rcu_read_unlock_bh(); |
713 | ||
a5a81f0b | 714 | return ret; |
1da177e4 LT |
715 | } |
716 | ||
702cea56 DA |
717 | static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif, |
718 | int strict) | |
1da177e4 | 719 | { |
6e1809a5 DA |
720 | int m = 0; |
721 | ||
722 | if (!oif || nh->fib_nh_dev->ifindex == oif) | |
723 | m = 2; | |
1ab1457c | 724 | |
77d16f45 | 725 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 726 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 | 727 | #ifdef CONFIG_IPV6_ROUTER_PREF |
702cea56 | 728 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2; |
ebacaaa0 | 729 | #endif |
1ba9a895 | 730 | if ((strict & RT6_LOOKUP_F_REACHABLE) && |
702cea56 | 731 | !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) { |
1ba9a895 | 732 | int n = rt6_check_neigh(nh); |
afc154e9 HFS |
733 | if (n < 0) |
734 | return n; | |
735 | } | |
554cfb7e YH |
736 | return m; |
737 | } | |
738 | ||
28679ed1 DA |
739 | static bool find_match(struct fib6_nh *nh, u32 fib6_flags, |
740 | int oif, int strict, int *mpri, bool *do_rr) | |
554cfb7e | 741 | { |
afc154e9 | 742 | bool match_do_rr = false; |
28679ed1 DA |
743 | bool rc = false; |
744 | int m; | |
35103d11 | 745 | |
28679ed1 | 746 | if (nh->fib_nh_flags & RTNH_F_DEAD) |
8067bb8c IS |
747 | goto out; |
748 | ||
28679ed1 DA |
749 | if (ip6_ignore_linkdown(nh->fib_nh_dev) && |
750 | nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
d5d32e4b | 751 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) |
35103d11 | 752 | goto out; |
f11e6659 | 753 | |
28679ed1 | 754 | m = rt6_score_route(nh, fib6_flags, oif, strict); |
7e980569 | 755 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
756 | match_do_rr = true; |
757 | m = 0; /* lowest valid score */ | |
7e980569 | 758 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 759 | goto out; |
afc154e9 HFS |
760 | } |
761 | ||
762 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
28679ed1 | 763 | rt6_probe(nh); |
f11e6659 | 764 | |
7e980569 | 765 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 766 | if (m > *mpri) { |
afc154e9 | 767 | *do_rr = match_do_rr; |
f11e6659 | 768 | *mpri = m; |
28679ed1 | 769 | rc = true; |
f11e6659 | 770 | } |
f11e6659 | 771 | out: |
28679ed1 | 772 | return rc; |
f11e6659 DM |
773 | } |
774 | ||
17a5984e DA |
775 | struct fib6_nh_frl_arg { |
776 | u32 flags; | |
777 | int oif; | |
778 | int strict; | |
779 | int *mpri; | |
780 | bool *do_rr; | |
781 | struct fib6_nh *nh; | |
782 | }; | |
783 | ||
784 | static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
785 | { | |
786 | struct fib6_nh_frl_arg *arg = _arg; | |
787 | ||
788 | arg->nh = nh; | |
789 | return find_match(nh, arg->flags, arg->oif, arg->strict, | |
790 | arg->mpri, arg->do_rr); | |
791 | } | |
792 | ||
b7bc4b6a | 793 | static void __find_rr_leaf(struct fib6_info *f6i_start, |
30c15f03 | 794 | struct fib6_info *nomatch, u32 metric, |
b7bc4b6a | 795 | struct fib6_result *res, struct fib6_info **cont, |
30c15f03 | 796 | int oif, int strict, bool *do_rr, int *mpri) |
f11e6659 | 797 | { |
b7bc4b6a | 798 | struct fib6_info *f6i; |
1da177e4 | 799 | |
b7bc4b6a DA |
800 | for (f6i = f6i_start; |
801 | f6i && f6i != nomatch; | |
802 | f6i = rcu_dereference(f6i->fib6_next)) { | |
17a5984e | 803 | bool matched = false; |
30c15f03 DA |
804 | struct fib6_nh *nh; |
805 | ||
b7bc4b6a DA |
806 | if (cont && f6i->fib6_metric != metric) { |
807 | *cont = f6i; | |
30c15f03 | 808 | return; |
9fbdcfaf SK |
809 | } |
810 | ||
b7bc4b6a | 811 | if (fib6_check_expired(f6i)) |
28679ed1 DA |
812 | continue; |
813 | ||
17a5984e DA |
814 | if (unlikely(f6i->nh)) { |
815 | struct fib6_nh_frl_arg arg = { | |
816 | .flags = f6i->fib6_flags, | |
817 | .oif = oif, | |
818 | .strict = strict, | |
819 | .mpri = mpri, | |
820 | .do_rr = do_rr | |
821 | }; | |
822 | ||
823 | if (nexthop_is_blackhole(f6i->nh)) { | |
824 | res->fib6_flags = RTF_REJECT; | |
825 | res->fib6_type = RTN_BLACKHOLE; | |
826 | res->f6i = f6i; | |
827 | res->nh = nexthop_fib6_nh(f6i->nh); | |
828 | return; | |
829 | } | |
830 | if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match, | |
831 | &arg)) { | |
832 | matched = true; | |
833 | nh = arg.nh; | |
834 | } | |
835 | } else { | |
836 | nh = f6i->fib6_nh; | |
837 | if (find_match(nh, f6i->fib6_flags, oif, strict, | |
838 | mpri, do_rr)) | |
839 | matched = true; | |
840 | } | |
841 | if (matched) { | |
b7bc4b6a DA |
842 | res->f6i = f6i; |
843 | res->nh = nh; | |
7d21fec9 DA |
844 | res->fib6_flags = f6i->fib6_flags; |
845 | res->fib6_type = f6i->fib6_type; | |
b7bc4b6a | 846 | } |
9fbdcfaf | 847 | } |
30c15f03 | 848 | } |
9fbdcfaf | 849 | |
b7bc4b6a DA |
850 | static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf, |
851 | struct fib6_info *rr_head, int oif, int strict, | |
852 | bool *do_rr, struct fib6_result *res) | |
30c15f03 | 853 | { |
b7bc4b6a DA |
854 | u32 metric = rr_head->fib6_metric; |
855 | struct fib6_info *cont = NULL; | |
30c15f03 | 856 | int mpri = -1; |
9fbdcfaf | 857 | |
b7bc4b6a | 858 | __find_rr_leaf(rr_head, NULL, metric, res, &cont, |
30c15f03 | 859 | oif, strict, do_rr, &mpri); |
28679ed1 | 860 | |
b7bc4b6a | 861 | __find_rr_leaf(leaf, rr_head, metric, res, &cont, |
30c15f03 | 862 | oif, strict, do_rr, &mpri); |
9fbdcfaf | 863 | |
b7bc4b6a DA |
864 | if (res->f6i || !cont) |
865 | return; | |
9fbdcfaf | 866 | |
b7bc4b6a | 867 | __find_rr_leaf(cont, NULL, metric, res, NULL, |
30c15f03 | 868 | oif, strict, do_rr, &mpri); |
f11e6659 | 869 | } |
1da177e4 | 870 | |
b7bc4b6a DA |
871 | static void rt6_select(struct net *net, struct fib6_node *fn, int oif, |
872 | struct fib6_result *res, int strict) | |
f11e6659 | 873 | { |
8d1c802b | 874 | struct fib6_info *leaf = rcu_dereference(fn->leaf); |
b7bc4b6a | 875 | struct fib6_info *rt0; |
afc154e9 | 876 | bool do_rr = false; |
17ecf590 | 877 | int key_plen; |
1da177e4 | 878 | |
b7bc4b6a DA |
879 | /* make sure this function or its helpers sets f6i */ |
880 | res->f6i = NULL; | |
881 | ||
421842ed | 882 | if (!leaf || leaf == net->ipv6.fib6_null_entry) |
b7bc4b6a | 883 | goto out; |
8d1040e8 | 884 | |
66f5d6ce | 885 | rt0 = rcu_dereference(fn->rr_ptr); |
f11e6659 | 886 | if (!rt0) |
66f5d6ce | 887 | rt0 = leaf; |
1da177e4 | 888 | |
17ecf590 WW |
889 | /* Double check to make sure fn is not an intermediate node |
890 | * and fn->leaf does not points to its child's leaf | |
891 | * (This might happen if all routes under fn are deleted from | |
892 | * the tree and fib6_repair_tree() is called on the node.) | |
893 | */ | |
93c2fb25 | 894 | key_plen = rt0->fib6_dst.plen; |
17ecf590 | 895 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
896 | if (rt0->fib6_src.plen) |
897 | key_plen = rt0->fib6_src.plen; | |
17ecf590 WW |
898 | #endif |
899 | if (fn->fn_bit != key_plen) | |
b7bc4b6a | 900 | goto out; |
1da177e4 | 901 | |
b7bc4b6a | 902 | find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res); |
afc154e9 | 903 | if (do_rr) { |
8fb11a9a | 904 | struct fib6_info *next = rcu_dereference(rt0->fib6_next); |
f11e6659 | 905 | |
554cfb7e | 906 | /* no entries matched; do round-robin */ |
93c2fb25 | 907 | if (!next || next->fib6_metric != rt0->fib6_metric) |
8d1040e8 | 908 | next = leaf; |
f11e6659 | 909 | |
66f5d6ce | 910 | if (next != rt0) { |
93c2fb25 | 911 | spin_lock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 912 | /* make sure next is not being deleted from the tree */ |
93c2fb25 | 913 | if (next->fib6_node) |
66f5d6ce | 914 | rcu_assign_pointer(fn->rr_ptr, next); |
93c2fb25 | 915 | spin_unlock_bh(&leaf->fib6_table->tb6_lock); |
66f5d6ce | 916 | } |
1da177e4 | 917 | } |
1da177e4 | 918 | |
b7bc4b6a DA |
919 | out: |
920 | if (!res->f6i) { | |
921 | res->f6i = net->ipv6.fib6_null_entry; | |
1cf844c7 | 922 | res->nh = res->f6i->fib6_nh; |
7d21fec9 DA |
923 | res->fib6_flags = res->f6i->fib6_flags; |
924 | res->fib6_type = res->f6i->fib6_type; | |
b7bc4b6a | 925 | } |
1da177e4 LT |
926 | } |
927 | ||
85bd05de | 928 | static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res) |
8b9df265 | 929 | { |
85bd05de DA |
930 | return (res->f6i->fib6_flags & RTF_NONEXTHOP) || |
931 | res->nh->fib_nh_gw_family; | |
8b9df265 MKL |
932 | } |
933 | ||
70ceb4f5 YH |
934 | #ifdef CONFIG_IPV6_ROUTE_INFO |
935 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 936 | const struct in6_addr *gwaddr) |
70ceb4f5 | 937 | { |
c346dca1 | 938 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
939 | struct route_info *rinfo = (struct route_info *) opt; |
940 | struct in6_addr prefix_buf, *prefix; | |
941 | unsigned int pref; | |
4bed72e4 | 942 | unsigned long lifetime; |
8d1c802b | 943 | struct fib6_info *rt; |
70ceb4f5 YH |
944 | |
945 | if (len < sizeof(struct route_info)) { | |
946 | return -EINVAL; | |
947 | } | |
948 | ||
949 | /* Sanity check for prefix_len and length */ | |
950 | if (rinfo->length > 3) { | |
951 | return -EINVAL; | |
952 | } else if (rinfo->prefix_len > 128) { | |
953 | return -EINVAL; | |
954 | } else if (rinfo->prefix_len > 64) { | |
955 | if (rinfo->length < 2) { | |
956 | return -EINVAL; | |
957 | } | |
958 | } else if (rinfo->prefix_len > 0) { | |
959 | if (rinfo->length < 1) { | |
960 | return -EINVAL; | |
961 | } | |
962 | } | |
963 | ||
964 | pref = rinfo->route_pref; | |
965 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 966 | return -EINVAL; |
70ceb4f5 | 967 | |
4bed72e4 | 968 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
969 | |
970 | if (rinfo->length == 3) | |
971 | prefix = (struct in6_addr *)rinfo->prefix; | |
972 | else { | |
973 | /* this function is safe */ | |
974 | ipv6_addr_prefix(&prefix_buf, | |
975 | (struct in6_addr *)rinfo->prefix, | |
976 | rinfo->prefix_len); | |
977 | prefix = &prefix_buf; | |
978 | } | |
979 | ||
f104a567 | 980 | if (rinfo->prefix_len == 0) |
afb1d4b5 | 981 | rt = rt6_get_dflt_router(net, gwaddr, dev); |
f104a567 DJ |
982 | else |
983 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 984 | gwaddr, dev); |
70ceb4f5 YH |
985 | |
986 | if (rt && !lifetime) { | |
afb1d4b5 | 987 | ip6_del_rt(net, rt); |
70ceb4f5 YH |
988 | rt = NULL; |
989 | } | |
990 | ||
991 | if (!rt && lifetime) | |
830218c1 DA |
992 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
993 | dev, pref); | |
70ceb4f5 | 994 | else if (rt) |
93c2fb25 DA |
995 | rt->fib6_flags = RTF_ROUTEINFO | |
996 | (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
70ceb4f5 YH |
997 | |
998 | if (rt) { | |
1716a961 | 999 | if (!addrconf_finite_timeout(lifetime)) |
14895687 | 1000 | fib6_clean_expires(rt); |
1716a961 | 1001 | else |
14895687 | 1002 | fib6_set_expires(rt, jiffies + HZ * lifetime); |
1716a961 | 1003 | |
93531c67 | 1004 | fib6_info_release(rt); |
70ceb4f5 YH |
1005 | } |
1006 | return 0; | |
1007 | } | |
1008 | #endif | |
1009 | ||
ae90d867 DA |
1010 | /* |
1011 | * Misc support functions | |
1012 | */ | |
1013 | ||
1014 | /* called with rcu_lock held */ | |
0d161581 | 1015 | static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res) |
ae90d867 | 1016 | { |
0d161581 | 1017 | struct net_device *dev = res->nh->fib_nh_dev; |
ae90d867 | 1018 | |
7d21fec9 | 1019 | if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) { |
ae90d867 DA |
1020 | /* for copies of local routes, dst->dev needs to be the |
1021 | * device if it is a master device, the master device if | |
1022 | * device is enslaved, and the loopback as the default | |
1023 | */ | |
1024 | if (netif_is_l3_slave(dev) && | |
7d21fec9 | 1025 | !rt6_need_strict(&res->f6i->fib6_dst.addr)) |
ae90d867 DA |
1026 | dev = l3mdev_master_dev_rcu(dev); |
1027 | else if (!netif_is_l3_master(dev)) | |
1028 | dev = dev_net(dev)->loopback_dev; | |
1029 | /* last case is netif_is_l3_master(dev) is true in which | |
1030 | * case we want dev returned to be dev | |
1031 | */ | |
1032 | } | |
1033 | ||
1034 | return dev; | |
1035 | } | |
1036 | ||
6edb3c96 DA |
1037 | static const int fib6_prop[RTN_MAX + 1] = { |
1038 | [RTN_UNSPEC] = 0, | |
1039 | [RTN_UNICAST] = 0, | |
1040 | [RTN_LOCAL] = 0, | |
1041 | [RTN_BROADCAST] = 0, | |
1042 | [RTN_ANYCAST] = 0, | |
1043 | [RTN_MULTICAST] = 0, | |
1044 | [RTN_BLACKHOLE] = -EINVAL, | |
1045 | [RTN_UNREACHABLE] = -EHOSTUNREACH, | |
1046 | [RTN_PROHIBIT] = -EACCES, | |
1047 | [RTN_THROW] = -EAGAIN, | |
1048 | [RTN_NAT] = -EINVAL, | |
1049 | [RTN_XRESOLVE] = -EINVAL, | |
1050 | }; | |
1051 | ||
1052 | static int ip6_rt_type_to_error(u8 fib6_type) | |
1053 | { | |
1054 | return fib6_prop[fib6_type]; | |
1055 | } | |
1056 | ||
8d1c802b | 1057 | static unsigned short fib6_info_dst_flags(struct fib6_info *rt) |
3b6761d1 DA |
1058 | { |
1059 | unsigned short flags = 0; | |
1060 | ||
1061 | if (rt->dst_nocount) | |
1062 | flags |= DST_NOCOUNT; | |
1063 | if (rt->dst_nopolicy) | |
1064 | flags |= DST_NOPOLICY; | |
3b6761d1 DA |
1065 | |
1066 | return flags; | |
1067 | } | |
1068 | ||
7d21fec9 | 1069 | static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type) |
6edb3c96 | 1070 | { |
7d21fec9 | 1071 | rt->dst.error = ip6_rt_type_to_error(fib6_type); |
6edb3c96 | 1072 | |
7d21fec9 | 1073 | switch (fib6_type) { |
6edb3c96 DA |
1074 | case RTN_BLACKHOLE: |
1075 | rt->dst.output = dst_discard_out; | |
1076 | rt->dst.input = dst_discard; | |
1077 | break; | |
1078 | case RTN_PROHIBIT: | |
1079 | rt->dst.output = ip6_pkt_prohibit_out; | |
1080 | rt->dst.input = ip6_pkt_prohibit; | |
1081 | break; | |
1082 | case RTN_THROW: | |
1083 | case RTN_UNREACHABLE: | |
1084 | default: | |
1085 | rt->dst.output = ip6_pkt_discard_out; | |
1086 | rt->dst.input = ip6_pkt_discard; | |
1087 | break; | |
1088 | } | |
1089 | } | |
1090 | ||
0d161581 | 1091 | static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res) |
6edb3c96 | 1092 | { |
7d21fec9 | 1093 | struct fib6_info *f6i = res->f6i; |
0d161581 | 1094 | |
7d21fec9 DA |
1095 | if (res->fib6_flags & RTF_REJECT) { |
1096 | ip6_rt_init_dst_reject(rt, res->fib6_type); | |
6edb3c96 DA |
1097 | return; |
1098 | } | |
1099 | ||
1100 | rt->dst.error = 0; | |
1101 | rt->dst.output = ip6_output; | |
1102 | ||
7d21fec9 | 1103 | if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) { |
6edb3c96 | 1104 | rt->dst.input = ip6_input; |
7d21fec9 | 1105 | } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) { |
6edb3c96 DA |
1106 | rt->dst.input = ip6_mc_input; |
1107 | } else { | |
1108 | rt->dst.input = ip6_forward; | |
1109 | } | |
1110 | ||
0d161581 DA |
1111 | if (res->nh->fib_nh_lws) { |
1112 | rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws); | |
6edb3c96 DA |
1113 | lwtunnel_set_redirect(&rt->dst); |
1114 | } | |
1115 | ||
1116 | rt->dst.lastuse = jiffies; | |
1117 | } | |
1118 | ||
e873e4b9 | 1119 | /* Caller must already hold reference to @from */ |
8d1c802b | 1120 | static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from) |
ae90d867 | 1121 | { |
ae90d867 | 1122 | rt->rt6i_flags &= ~RTF_EXPIRES; |
a68886a6 | 1123 | rcu_assign_pointer(rt->from, from); |
e1255ed4 | 1124 | ip_dst_init_metrics(&rt->dst, from->fib6_metrics); |
ae90d867 DA |
1125 | } |
1126 | ||
0d161581 DA |
1127 | /* Caller must already hold reference to f6i in result */ |
1128 | static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res) | |
ae90d867 | 1129 | { |
0d161581 DA |
1130 | const struct fib6_nh *nh = res->nh; |
1131 | const struct net_device *dev = nh->fib_nh_dev; | |
1132 | struct fib6_info *f6i = res->f6i; | |
dcd1f572 | 1133 | |
0d161581 | 1134 | ip6_rt_init_dst(rt, res); |
6edb3c96 | 1135 | |
0d161581 | 1136 | rt->rt6i_dst = f6i->fib6_dst; |
dcd1f572 | 1137 | rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; |
7d21fec9 | 1138 | rt->rt6i_flags = res->fib6_flags; |
0d161581 DA |
1139 | if (nh->fib_nh_gw_family) { |
1140 | rt->rt6i_gateway = nh->fib_nh_gw6; | |
2b2450ca DA |
1141 | rt->rt6i_flags |= RTF_GATEWAY; |
1142 | } | |
0d161581 | 1143 | rt6_set_from(rt, f6i); |
ae90d867 | 1144 | #ifdef CONFIG_IPV6_SUBTREES |
0d161581 | 1145 | rt->rt6i_src = f6i->fib6_src; |
ae90d867 | 1146 | #endif |
ae90d867 DA |
1147 | } |
1148 | ||
a3c00e46 MKL |
1149 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
1150 | struct in6_addr *saddr) | |
1151 | { | |
66f5d6ce | 1152 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
1153 | while (1) { |
1154 | if (fn->fn_flags & RTN_TL_ROOT) | |
1155 | return NULL; | |
66f5d6ce WW |
1156 | pn = rcu_dereference(fn->parent); |
1157 | sn = FIB6_SUBTREE(pn); | |
1158 | if (sn && sn != fn) | |
6454743b | 1159 | fn = fib6_node_lookup(sn, NULL, saddr); |
a3c00e46 MKL |
1160 | else |
1161 | fn = pn; | |
1162 | if (fn->fn_flags & RTN_RTINFO) | |
1163 | return fn; | |
1164 | } | |
1165 | } | |
c71099ac | 1166 | |
10585b43 | 1167 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt) |
d3843fe5 WW |
1168 | { |
1169 | struct rt6_info *rt = *prt; | |
1170 | ||
1171 | if (dst_hold_safe(&rt->dst)) | |
1172 | return true; | |
10585b43 | 1173 | if (net) { |
d3843fe5 WW |
1174 | rt = net->ipv6.ip6_null_entry; |
1175 | dst_hold(&rt->dst); | |
1176 | } else { | |
1177 | rt = NULL; | |
1178 | } | |
1179 | *prt = rt; | |
1180 | return false; | |
1181 | } | |
1182 | ||
dec9b0e2 | 1183 | /* called with rcu_lock held */ |
9b6b35ab | 1184 | static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res) |
dec9b0e2 | 1185 | { |
9b6b35ab DA |
1186 | struct net_device *dev = res->nh->fib_nh_dev; |
1187 | struct fib6_info *f6i = res->f6i; | |
1188 | unsigned short flags; | |
dec9b0e2 DA |
1189 | struct rt6_info *nrt; |
1190 | ||
9b6b35ab | 1191 | if (!fib6_info_hold_safe(f6i)) |
1c87e79a | 1192 | goto fallback; |
e873e4b9 | 1193 | |
9b6b35ab | 1194 | flags = fib6_info_dst_flags(f6i); |
93531c67 | 1195 | nrt = ip6_dst_alloc(dev_net(dev), dev, flags); |
1c87e79a | 1196 | if (!nrt) { |
9b6b35ab | 1197 | fib6_info_release(f6i); |
1c87e79a XL |
1198 | goto fallback; |
1199 | } | |
dec9b0e2 | 1200 | |
0d161581 | 1201 | ip6_rt_copy_init(nrt, res); |
1c87e79a XL |
1202 | return nrt; |
1203 | ||
1204 | fallback: | |
1205 | nrt = dev_net(dev)->ipv6.ip6_null_entry; | |
1206 | dst_hold(&nrt->dst); | |
dec9b0e2 DA |
1207 | return nrt; |
1208 | } | |
1209 | ||
8ed67789 DL |
1210 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
1211 | struct fib6_table *table, | |
b75cc8f9 DA |
1212 | struct flowi6 *fl6, |
1213 | const struct sk_buff *skb, | |
1214 | int flags) | |
1da177e4 | 1215 | { |
b1d40991 | 1216 | struct fib6_result res = {}; |
1da177e4 | 1217 | struct fib6_node *fn; |
23fb93a4 | 1218 | struct rt6_info *rt; |
1da177e4 | 1219 | |
b6cdbc85 DA |
1220 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1221 | flags &= ~RT6_LOOKUP_F_IFACE; | |
1222 | ||
66f5d6ce | 1223 | rcu_read_lock(); |
6454743b | 1224 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 1225 | restart: |
b1d40991 DA |
1226 | res.f6i = rcu_dereference(fn->leaf); |
1227 | if (!res.f6i) | |
1228 | res.f6i = net->ipv6.fib6_null_entry; | |
af52a52c | 1229 | else |
75ef7389 DA |
1230 | rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif, |
1231 | flags); | |
af52a52c | 1232 | |
b1d40991 | 1233 | if (res.f6i == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
1234 | fn = fib6_backtrack(fn, &fl6->saddr); |
1235 | if (fn) | |
1236 | goto restart; | |
2b760fcf | 1237 | |
af52a52c DA |
1238 | rt = net->ipv6.ip6_null_entry; |
1239 | dst_hold(&rt->dst); | |
1240 | goto out; | |
f88d8ea6 DA |
1241 | } else if (res.fib6_flags & RTF_REJECT) { |
1242 | goto do_create; | |
af52a52c | 1243 | } |
d3843fe5 | 1244 | |
b1d40991 DA |
1245 | fib6_select_path(net, &res, fl6, fl6->flowi6_oif, |
1246 | fl6->flowi6_oif != 0, skb, flags); | |
1247 | ||
2b760fcf | 1248 | /* Search through exception table */ |
7e4b5128 | 1249 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 1250 | if (rt) { |
10585b43 | 1251 | if (ip6_hold_safe(net, &rt)) |
dec9b0e2 | 1252 | dst_use_noref(&rt->dst, jiffies); |
23fb93a4 | 1253 | } else { |
f88d8ea6 | 1254 | do_create: |
9b6b35ab | 1255 | rt = ip6_create_rt_rcu(&res); |
dec9b0e2 | 1256 | } |
b811580d | 1257 | |
af52a52c | 1258 | out: |
8ff2e5b2 | 1259 | trace_fib6_table_lookup(net, &res, table, fl6); |
af52a52c | 1260 | |
66f5d6ce | 1261 | rcu_read_unlock(); |
b811580d | 1262 | |
c71099ac | 1263 | return rt; |
c71099ac TG |
1264 | } |
1265 | ||
67ba4152 | 1266 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 1267 | const struct sk_buff *skb, int flags) |
ea6e574e | 1268 | { |
b75cc8f9 | 1269 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup); |
ea6e574e FW |
1270 | } |
1271 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
1272 | ||
9acd9f3a | 1273 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
1274 | const struct in6_addr *saddr, int oif, |
1275 | const struct sk_buff *skb, int strict) | |
c71099ac | 1276 | { |
4c9483b2 DM |
1277 | struct flowi6 fl6 = { |
1278 | .flowi6_oif = oif, | |
1279 | .daddr = *daddr, | |
c71099ac TG |
1280 | }; |
1281 | struct dst_entry *dst; | |
77d16f45 | 1282 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 1283 | |
adaa70bb | 1284 | if (saddr) { |
4c9483b2 | 1285 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
1286 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1287 | } | |
1288 | ||
b75cc8f9 | 1289 | dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup); |
c71099ac TG |
1290 | if (dst->error == 0) |
1291 | return (struct rt6_info *) dst; | |
1292 | ||
1293 | dst_release(dst); | |
1294 | ||
1da177e4 LT |
1295 | return NULL; |
1296 | } | |
7159039a YH |
1297 | EXPORT_SYMBOL(rt6_lookup); |
1298 | ||
c71099ac | 1299 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
1300 | * It takes new route entry, the addition fails by any reason the |
1301 | * route is released. | |
1302 | * Caller must hold dst before calling it. | |
1da177e4 LT |
1303 | */ |
1304 | ||
8d1c802b | 1305 | static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info, |
333c4301 | 1306 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1307 | { |
1308 | int err; | |
c71099ac | 1309 | struct fib6_table *table; |
1da177e4 | 1310 | |
93c2fb25 | 1311 | table = rt->fib6_table; |
66f5d6ce | 1312 | spin_lock_bh(&table->tb6_lock); |
d4ead6b3 | 1313 | err = fib6_add(&table->tb6_root, rt, info, extack); |
66f5d6ce | 1314 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1315 | |
1316 | return err; | |
1317 | } | |
1318 | ||
8d1c802b | 1319 | int ip6_ins_rt(struct net *net, struct fib6_info *rt) |
40e22e8f | 1320 | { |
afb1d4b5 | 1321 | struct nl_info info = { .nl_net = net, }; |
e715b6d3 | 1322 | |
d4ead6b3 | 1323 | return __ip6_ins_rt(rt, &info, NULL); |
40e22e8f TG |
1324 | } |
1325 | ||
85bd05de | 1326 | static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res, |
8b9df265 MKL |
1327 | const struct in6_addr *daddr, |
1328 | const struct in6_addr *saddr) | |
1da177e4 | 1329 | { |
85bd05de | 1330 | struct fib6_info *f6i = res->f6i; |
4832c30d | 1331 | struct net_device *dev; |
1da177e4 LT |
1332 | struct rt6_info *rt; |
1333 | ||
1334 | /* | |
1335 | * Clone the route. | |
1336 | */ | |
1337 | ||
85bd05de | 1338 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1339 | return NULL; |
1340 | ||
0d161581 | 1341 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1342 | rt = ip6_dst_alloc(dev_net(dev), dev, 0); |
e873e4b9 | 1343 | if (!rt) { |
85bd05de | 1344 | fib6_info_release(f6i); |
83a09abd | 1345 | return NULL; |
e873e4b9 | 1346 | } |
83a09abd | 1347 | |
0d161581 | 1348 | ip6_rt_copy_init(rt, res); |
83a09abd | 1349 | rt->rt6i_flags |= RTF_CACHE; |
83a09abd MKL |
1350 | rt->rt6i_dst.addr = *daddr; |
1351 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1352 | |
85bd05de DA |
1353 | if (!rt6_is_gw_or_nonexthop(res)) { |
1354 | if (f6i->fib6_dst.plen != 128 && | |
1355 | ipv6_addr_equal(&f6i->fib6_dst.addr, daddr)) | |
83a09abd | 1356 | rt->rt6i_flags |= RTF_ANYCAST; |
1da177e4 | 1357 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1358 | if (rt->rt6i_src.plen && saddr) { |
1359 | rt->rt6i_src.addr = *saddr; | |
1360 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1361 | } |
83a09abd | 1362 | #endif |
95a9a5ba | 1363 | } |
1da177e4 | 1364 | |
95a9a5ba YH |
1365 | return rt; |
1366 | } | |
1da177e4 | 1367 | |
db3fedee | 1368 | static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res) |
d52d3997 | 1369 | { |
db3fedee DA |
1370 | struct fib6_info *f6i = res->f6i; |
1371 | unsigned short flags = fib6_info_dst_flags(f6i); | |
4832c30d | 1372 | struct net_device *dev; |
d52d3997 MKL |
1373 | struct rt6_info *pcpu_rt; |
1374 | ||
db3fedee | 1375 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1376 | return NULL; |
1377 | ||
4832c30d | 1378 | rcu_read_lock(); |
0d161581 | 1379 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1380 | pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags); |
4832c30d | 1381 | rcu_read_unlock(); |
e873e4b9 | 1382 | if (!pcpu_rt) { |
db3fedee | 1383 | fib6_info_release(f6i); |
d52d3997 | 1384 | return NULL; |
e873e4b9 | 1385 | } |
0d161581 | 1386 | ip6_rt_copy_init(pcpu_rt, res); |
d52d3997 MKL |
1387 | pcpu_rt->rt6i_flags |= RTF_PCPU; |
1388 | return pcpu_rt; | |
1389 | } | |
1390 | ||
66f5d6ce | 1391 | /* It should be called with rcu_read_lock() acquired */ |
db3fedee | 1392 | static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res) |
d52d3997 | 1393 | { |
c353071a | 1394 | struct rt6_info *pcpu_rt; |
d52d3997 | 1395 | |
c353071a | 1396 | pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu); |
d52d3997 | 1397 | |
a73e4195 MKL |
1398 | return pcpu_rt; |
1399 | } | |
1400 | ||
afb1d4b5 | 1401 | static struct rt6_info *rt6_make_pcpu_route(struct net *net, |
db3fedee | 1402 | const struct fib6_result *res) |
a73e4195 MKL |
1403 | { |
1404 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 | 1405 | |
db3fedee | 1406 | pcpu_rt = ip6_rt_pcpu_alloc(res); |
0e09edcc WW |
1407 | if (!pcpu_rt) |
1408 | return NULL; | |
d52d3997 | 1409 | |
f40b6ae2 | 1410 | p = this_cpu_ptr(res->nh->rt6i_pcpu); |
a94b9367 | 1411 | prev = cmpxchg(p, NULL, pcpu_rt); |
951f788a | 1412 | BUG_ON(prev); |
a94b9367 | 1413 | |
61fb0d01 ED |
1414 | if (res->f6i->fib6_destroying) { |
1415 | struct fib6_info *from; | |
1416 | ||
1417 | from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL); | |
1418 | fib6_info_release(from); | |
1419 | } | |
1420 | ||
d52d3997 MKL |
1421 | return pcpu_rt; |
1422 | } | |
1423 | ||
35732d01 WW |
1424 | /* exception hash table implementation |
1425 | */ | |
1426 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1427 | ||
1428 | /* Remove rt6_ex from hash table and free the memory | |
1429 | * Caller must hold rt6_exception_lock | |
1430 | */ | |
1431 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1432 | struct rt6_exception *rt6_ex) | |
1433 | { | |
f5b51fe8 | 1434 | struct fib6_info *from; |
b2427e67 | 1435 | struct net *net; |
81eb8447 | 1436 | |
35732d01 WW |
1437 | if (!bucket || !rt6_ex) |
1438 | return; | |
b2427e67 CIK |
1439 | |
1440 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
f5b51fe8 PA |
1441 | net->ipv6.rt6_stats->fib_rt_cache--; |
1442 | ||
1443 | /* purge completely the exception to allow releasing the held resources: | |
1444 | * some [sk] cache may keep the dst around for unlimited time | |
1445 | */ | |
0e233874 | 1446 | from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL); |
f5b51fe8 PA |
1447 | fib6_info_release(from); |
1448 | dst_dev_put(&rt6_ex->rt6i->dst); | |
1449 | ||
35732d01 | 1450 | hlist_del_rcu(&rt6_ex->hlist); |
77634cc6 | 1451 | dst_release(&rt6_ex->rt6i->dst); |
35732d01 WW |
1452 | kfree_rcu(rt6_ex, rcu); |
1453 | WARN_ON_ONCE(!bucket->depth); | |
1454 | bucket->depth--; | |
1455 | } | |
1456 | ||
1457 | /* Remove oldest rt6_ex in bucket and free the memory | |
1458 | * Caller must hold rt6_exception_lock | |
1459 | */ | |
1460 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1461 | { | |
1462 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1463 | ||
1464 | if (!bucket) | |
1465 | return; | |
1466 | ||
1467 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1468 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1469 | oldest = rt6_ex; | |
1470 | } | |
1471 | rt6_remove_exception(bucket, oldest); | |
1472 | } | |
1473 | ||
1474 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1475 | const struct in6_addr *src) | |
1476 | { | |
1477 | static u32 seed __read_mostly; | |
1478 | u32 val; | |
1479 | ||
1480 | net_get_random_once(&seed, sizeof(seed)); | |
b6b556af | 1481 | val = jhash2((const u32 *)dst, sizeof(*dst)/sizeof(u32), seed); |
35732d01 WW |
1482 | |
1483 | #ifdef CONFIG_IPV6_SUBTREES | |
1484 | if (src) | |
b6b556af | 1485 | val = jhash2((const u32 *)src, sizeof(*src)/sizeof(u32), val); |
35732d01 WW |
1486 | #endif |
1487 | return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
1488 | } | |
1489 | ||
1490 | /* Helper function to find the cached rt in the hash table | |
1491 | * and update bucket pointer to point to the bucket for this | |
1492 | * (daddr, saddr) pair | |
1493 | * Caller must hold rt6_exception_lock | |
1494 | */ | |
1495 | static struct rt6_exception * | |
1496 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1497 | const struct in6_addr *daddr, | |
1498 | const struct in6_addr *saddr) | |
1499 | { | |
1500 | struct rt6_exception *rt6_ex; | |
1501 | u32 hval; | |
1502 | ||
1503 | if (!(*bucket) || !daddr) | |
1504 | return NULL; | |
1505 | ||
1506 | hval = rt6_exception_hash(daddr, saddr); | |
1507 | *bucket += hval; | |
1508 | ||
1509 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1510 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1511 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1512 | ||
1513 | #ifdef CONFIG_IPV6_SUBTREES | |
1514 | if (matched && saddr) | |
1515 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1516 | #endif | |
1517 | if (matched) | |
1518 | return rt6_ex; | |
1519 | } | |
1520 | return NULL; | |
1521 | } | |
1522 | ||
1523 | /* Helper function to find the cached rt in the hash table | |
1524 | * and update bucket pointer to point to the bucket for this | |
1525 | * (daddr, saddr) pair | |
1526 | * Caller must hold rcu_read_lock() | |
1527 | */ | |
1528 | static struct rt6_exception * | |
1529 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1530 | const struct in6_addr *daddr, | |
1531 | const struct in6_addr *saddr) | |
1532 | { | |
1533 | struct rt6_exception *rt6_ex; | |
1534 | u32 hval; | |
1535 | ||
1536 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1537 | ||
1538 | if (!(*bucket) || !daddr) | |
1539 | return NULL; | |
1540 | ||
1541 | hval = rt6_exception_hash(daddr, saddr); | |
1542 | *bucket += hval; | |
1543 | ||
1544 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1545 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1546 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1547 | ||
1548 | #ifdef CONFIG_IPV6_SUBTREES | |
1549 | if (matched && saddr) | |
1550 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1551 | #endif | |
1552 | if (matched) | |
1553 | return rt6_ex; | |
1554 | } | |
1555 | return NULL; | |
1556 | } | |
1557 | ||
b748f260 | 1558 | static unsigned int fib6_mtu(const struct fib6_result *res) |
d4ead6b3 | 1559 | { |
b748f260 | 1560 | const struct fib6_nh *nh = res->nh; |
d4ead6b3 DA |
1561 | unsigned int mtu; |
1562 | ||
b748f260 DA |
1563 | if (res->f6i->fib6_pmtu) { |
1564 | mtu = res->f6i->fib6_pmtu; | |
dcd1f572 | 1565 | } else { |
b748f260 | 1566 | struct net_device *dev = nh->fib_nh_dev; |
dcd1f572 DA |
1567 | struct inet6_dev *idev; |
1568 | ||
1569 | rcu_read_lock(); | |
1570 | idev = __in6_dev_get(dev); | |
1571 | mtu = idev->cnf.mtu6; | |
1572 | rcu_read_unlock(); | |
1573 | } | |
1574 | ||
d4ead6b3 DA |
1575 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1576 | ||
b748f260 | 1577 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
d4ead6b3 DA |
1578 | } |
1579 | ||
cc5c073a DA |
1580 | #define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL |
1581 | ||
1582 | /* used when the flushed bit is not relevant, only access to the bucket | |
1583 | * (ie., all bucket users except rt6_insert_exception); | |
1584 | * | |
1585 | * called under rcu lock; sometimes called with rt6_exception_lock held | |
1586 | */ | |
1587 | static | |
1588 | struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh, | |
1589 | spinlock_t *lock) | |
1590 | { | |
1591 | struct rt6_exception_bucket *bucket; | |
1592 | ||
1593 | if (lock) | |
1594 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1595 | lockdep_is_held(lock)); | |
1596 | else | |
1597 | bucket = rcu_dereference(nh->rt6i_exception_bucket); | |
1598 | ||
1599 | /* remove bucket flushed bit if set */ | |
1600 | if (bucket) { | |
1601 | unsigned long p = (unsigned long)bucket; | |
1602 | ||
1603 | p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1604 | bucket = (struct rt6_exception_bucket *)p; | |
1605 | } | |
1606 | ||
1607 | return bucket; | |
1608 | } | |
1609 | ||
1610 | static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket) | |
1611 | { | |
1612 | unsigned long p = (unsigned long)bucket; | |
1613 | ||
1614 | return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED); | |
1615 | } | |
1616 | ||
1617 | /* called with rt6_exception_lock held */ | |
1618 | static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh, | |
1619 | spinlock_t *lock) | |
1620 | { | |
1621 | struct rt6_exception_bucket *bucket; | |
1622 | unsigned long p; | |
1623 | ||
1624 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1625 | lockdep_is_held(lock)); | |
1626 | ||
1627 | p = (unsigned long)bucket; | |
1628 | p |= FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1629 | bucket = (struct rt6_exception_bucket *)p; | |
1630 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); | |
1631 | } | |
1632 | ||
35732d01 | 1633 | static int rt6_insert_exception(struct rt6_info *nrt, |
5012f0a5 | 1634 | const struct fib6_result *res) |
35732d01 | 1635 | { |
5e670d84 | 1636 | struct net *net = dev_net(nrt->dst.dev); |
35732d01 | 1637 | struct rt6_exception_bucket *bucket; |
cc5c073a | 1638 | struct fib6_info *f6i = res->f6i; |
35732d01 WW |
1639 | struct in6_addr *src_key = NULL; |
1640 | struct rt6_exception *rt6_ex; | |
cc5c073a | 1641 | struct fib6_nh *nh = res->nh; |
35732d01 WW |
1642 | int err = 0; |
1643 | ||
35732d01 WW |
1644 | spin_lock_bh(&rt6_exception_lock); |
1645 | ||
cc5c073a DA |
1646 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, |
1647 | lockdep_is_held(&rt6_exception_lock)); | |
35732d01 WW |
1648 | if (!bucket) { |
1649 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1650 | GFP_ATOMIC); | |
1651 | if (!bucket) { | |
1652 | err = -ENOMEM; | |
1653 | goto out; | |
1654 | } | |
cc5c073a DA |
1655 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); |
1656 | } else if (fib6_nh_excptn_bucket_flushed(bucket)) { | |
1657 | err = -EINVAL; | |
1658 | goto out; | |
35732d01 WW |
1659 | } |
1660 | ||
1661 | #ifdef CONFIG_IPV6_SUBTREES | |
5012f0a5 | 1662 | /* fib6_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1663 | * and exception table is indexed by a hash of |
5012f0a5 | 1664 | * both fib6_dst and fib6_src. |
35732d01 | 1665 | * Otherwise, the exception table is indexed by |
5012f0a5 | 1666 | * a hash of only fib6_dst. |
35732d01 | 1667 | */ |
5012f0a5 | 1668 | if (f6i->fib6_src.plen) |
35732d01 WW |
1669 | src_key = &nrt->rt6i_src.addr; |
1670 | #endif | |
5012f0a5 | 1671 | /* rt6_mtu_change() might lower mtu on f6i. |
f5bbe7ee | 1672 | * Only insert this exception route if its mtu |
5012f0a5 | 1673 | * is less than f6i's mtu value. |
f5bbe7ee | 1674 | */ |
b748f260 | 1675 | if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) { |
f5bbe7ee WW |
1676 | err = -EINVAL; |
1677 | goto out; | |
1678 | } | |
60006a48 | 1679 | |
35732d01 WW |
1680 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1681 | src_key); | |
1682 | if (rt6_ex) | |
1683 | rt6_remove_exception(bucket, rt6_ex); | |
1684 | ||
1685 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1686 | if (!rt6_ex) { | |
1687 | err = -ENOMEM; | |
1688 | goto out; | |
1689 | } | |
1690 | rt6_ex->rt6i = nrt; | |
1691 | rt6_ex->stamp = jiffies; | |
35732d01 WW |
1692 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); |
1693 | bucket->depth++; | |
81eb8447 | 1694 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 WW |
1695 | |
1696 | if (bucket->depth > FIB6_MAX_DEPTH) | |
1697 | rt6_exception_remove_oldest(bucket); | |
1698 | ||
1699 | out: | |
1700 | spin_unlock_bh(&rt6_exception_lock); | |
1701 | ||
1702 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1703 | if (!err) { |
5012f0a5 DA |
1704 | spin_lock_bh(&f6i->fib6_table->tb6_lock); |
1705 | fib6_update_sernum(net, f6i); | |
1706 | spin_unlock_bh(&f6i->fib6_table->tb6_lock); | |
b886d5f2 PA |
1707 | fib6_force_start_gc(net); |
1708 | } | |
35732d01 WW |
1709 | |
1710 | return err; | |
1711 | } | |
1712 | ||
c0b220cf | 1713 | static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from) |
35732d01 WW |
1714 | { |
1715 | struct rt6_exception_bucket *bucket; | |
1716 | struct rt6_exception *rt6_ex; | |
1717 | struct hlist_node *tmp; | |
1718 | int i; | |
1719 | ||
1720 | spin_lock_bh(&rt6_exception_lock); | |
35732d01 | 1721 | |
cc5c073a | 1722 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
35732d01 WW |
1723 | if (!bucket) |
1724 | goto out; | |
1725 | ||
cc5c073a DA |
1726 | /* Prevent rt6_insert_exception() to recreate the bucket list */ |
1727 | if (!from) | |
1728 | fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock); | |
1729 | ||
35732d01 | 1730 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { |
cc5c073a DA |
1731 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) { |
1732 | if (!from || | |
1733 | rcu_access_pointer(rt6_ex->rt6i->from) == from) | |
1734 | rt6_remove_exception(bucket, rt6_ex); | |
1735 | } | |
1736 | WARN_ON_ONCE(!from && bucket->depth); | |
35732d01 WW |
1737 | bucket++; |
1738 | } | |
35732d01 WW |
1739 | out: |
1740 | spin_unlock_bh(&rt6_exception_lock); | |
1741 | } | |
1742 | ||
e659ba31 DA |
1743 | static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg) |
1744 | { | |
1745 | struct fib6_info *f6i = arg; | |
1746 | ||
1747 | fib6_nh_flush_exceptions(nh, f6i); | |
1748 | ||
1749 | return 0; | |
1750 | } | |
1751 | ||
c0b220cf DA |
1752 | void rt6_flush_exceptions(struct fib6_info *f6i) |
1753 | { | |
e659ba31 DA |
1754 | if (f6i->nh) |
1755 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions, | |
1756 | f6i); | |
1757 | else | |
1758 | fib6_nh_flush_exceptions(f6i->fib6_nh, f6i); | |
c0b220cf DA |
1759 | } |
1760 | ||
35732d01 WW |
1761 | /* Find cached rt in the hash table inside passed in rt |
1762 | * Caller has to hold rcu_read_lock() | |
1763 | */ | |
7e4b5128 | 1764 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
1765 | const struct in6_addr *daddr, |
1766 | const struct in6_addr *saddr) | |
35732d01 | 1767 | { |
510e2ced | 1768 | const struct in6_addr *src_key = NULL; |
35732d01 | 1769 | struct rt6_exception_bucket *bucket; |
35732d01 | 1770 | struct rt6_exception *rt6_ex; |
7e4b5128 | 1771 | struct rt6_info *ret = NULL; |
35732d01 | 1772 | |
35732d01 | 1773 | #ifdef CONFIG_IPV6_SUBTREES |
7e4b5128 | 1774 | /* fib6i_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1775 | * and exception table is indexed by a hash of |
7e4b5128 | 1776 | * both fib6_dst and fib6_src. |
510e2ced WW |
1777 | * However, the src addr used to create the hash |
1778 | * might not be exactly the passed in saddr which | |
1779 | * is a /128 addr from the flow. | |
1780 | * So we need to use f6i->fib6_src to redo lookup | |
1781 | * if the passed in saddr does not find anything. | |
1782 | * (See the logic in ip6_rt_cache_alloc() on how | |
1783 | * rt->rt6i_src is updated.) | |
35732d01 | 1784 | */ |
7e4b5128 | 1785 | if (res->f6i->fib6_src.plen) |
35732d01 | 1786 | src_key = saddr; |
510e2ced | 1787 | find_ex: |
35732d01 | 1788 | #endif |
cc5c073a | 1789 | bucket = fib6_nh_get_excptn_bucket(res->nh, NULL); |
35732d01 WW |
1790 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); |
1791 | ||
1792 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
7e4b5128 | 1793 | ret = rt6_ex->rt6i; |
35732d01 | 1794 | |
510e2ced WW |
1795 | #ifdef CONFIG_IPV6_SUBTREES |
1796 | /* Use fib6_src as src_key and redo lookup */ | |
1797 | if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) { | |
1798 | src_key = &res->f6i->fib6_src.addr; | |
1799 | goto find_ex; | |
1800 | } | |
1801 | #endif | |
1802 | ||
7e4b5128 | 1803 | return ret; |
35732d01 WW |
1804 | } |
1805 | ||
1806 | /* Remove the passed in cached rt from the hash table that contains it */ | |
cc5c073a | 1807 | static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1808 | const struct rt6_info *rt) |
35732d01 | 1809 | { |
c0b220cf | 1810 | const struct in6_addr *src_key = NULL; |
35732d01 | 1811 | struct rt6_exception_bucket *bucket; |
35732d01 WW |
1812 | struct rt6_exception *rt6_ex; |
1813 | int err; | |
1814 | ||
cc5c073a | 1815 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
35732d01 WW |
1816 | return -ENOENT; |
1817 | ||
1818 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a DA |
1819 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
1820 | ||
35732d01 | 1821 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1822 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1823 | * and exception table is indexed by a hash of | |
1824 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1825 | * Otherwise, the exception table is indexed by |
1826 | * a hash of only rt6i_dst. | |
1827 | */ | |
c0b220cf | 1828 | if (plen) |
35732d01 WW |
1829 | src_key = &rt->rt6i_src.addr; |
1830 | #endif | |
1831 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1832 | &rt->rt6i_dst.addr, | |
1833 | src_key); | |
1834 | if (rt6_ex) { | |
1835 | rt6_remove_exception(bucket, rt6_ex); | |
1836 | err = 0; | |
1837 | } else { | |
1838 | err = -ENOENT; | |
1839 | } | |
1840 | ||
1841 | spin_unlock_bh(&rt6_exception_lock); | |
1842 | return err; | |
1843 | } | |
1844 | ||
e659ba31 DA |
1845 | struct fib6_nh_excptn_arg { |
1846 | struct rt6_info *rt; | |
1847 | int plen; | |
1848 | }; | |
1849 | ||
1850 | static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg) | |
1851 | { | |
1852 | struct fib6_nh_excptn_arg *arg = _arg; | |
1853 | int err; | |
1854 | ||
1855 | err = fib6_nh_remove_exception(nh, arg->plen, arg->rt); | |
1856 | if (err == 0) | |
1857 | return 1; | |
1858 | ||
1859 | return 0; | |
1860 | } | |
1861 | ||
c0b220cf DA |
1862 | static int rt6_remove_exception_rt(struct rt6_info *rt) |
1863 | { | |
1864 | struct fib6_info *from; | |
1865 | ||
1866 | from = rcu_dereference(rt->from); | |
cc5c073a | 1867 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) |
c0b220cf DA |
1868 | return -EINVAL; |
1869 | ||
e659ba31 DA |
1870 | if (from->nh) { |
1871 | struct fib6_nh_excptn_arg arg = { | |
1872 | .rt = rt, | |
1873 | .plen = from->fib6_src.plen | |
1874 | }; | |
1875 | int rc; | |
1876 | ||
1877 | /* rc = 1 means an entry was found */ | |
1878 | rc = nexthop_for_each_fib6_nh(from->nh, | |
1879 | rt6_nh_remove_exception_rt, | |
1880 | &arg); | |
1881 | return rc ? 0 : -ENOENT; | |
1882 | } | |
1883 | ||
1cf844c7 | 1884 | return fib6_nh_remove_exception(from->fib6_nh, |
cc5c073a | 1885 | from->fib6_src.plen, rt); |
c0b220cf DA |
1886 | } |
1887 | ||
35732d01 WW |
1888 | /* Find rt6_ex which contains the passed in rt cache and |
1889 | * refresh its stamp | |
1890 | */ | |
cc5c073a | 1891 | static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1892 | const struct rt6_info *rt) |
35732d01 | 1893 | { |
c0b220cf | 1894 | const struct in6_addr *src_key = NULL; |
35732d01 | 1895 | struct rt6_exception_bucket *bucket; |
35732d01 | 1896 | struct rt6_exception *rt6_ex; |
193f3685 | 1897 | |
cc5c073a | 1898 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); |
35732d01 | 1899 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1900 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1901 | * and exception table is indexed by a hash of | |
1902 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1903 | * Otherwise, the exception table is indexed by |
1904 | * a hash of only rt6i_dst. | |
1905 | */ | |
c0b220cf | 1906 | if (plen) |
35732d01 WW |
1907 | src_key = &rt->rt6i_src.addr; |
1908 | #endif | |
cc5c073a | 1909 | rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key); |
35732d01 WW |
1910 | if (rt6_ex) |
1911 | rt6_ex->stamp = jiffies; | |
c0b220cf DA |
1912 | } |
1913 | ||
e659ba31 DA |
1914 | struct fib6_nh_match_arg { |
1915 | const struct net_device *dev; | |
1916 | const struct in6_addr *gw; | |
1917 | struct fib6_nh *match; | |
1918 | }; | |
1919 | ||
1920 | /* determine if fib6_nh has given device and gateway */ | |
1921 | static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
1922 | { | |
1923 | struct fib6_nh_match_arg *arg = _arg; | |
1924 | ||
1925 | if (arg->dev != nh->fib_nh_dev || | |
1926 | (arg->gw && !nh->fib_nh_gw_family) || | |
1927 | (!arg->gw && nh->fib_nh_gw_family) || | |
1928 | (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6))) | |
1929 | return 0; | |
1930 | ||
1931 | arg->match = nh; | |
1932 | ||
1933 | /* found a match, break the loop */ | |
1934 | return 1; | |
1935 | } | |
1936 | ||
c0b220cf DA |
1937 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) |
1938 | { | |
1939 | struct fib6_info *from; | |
e659ba31 | 1940 | struct fib6_nh *fib6_nh; |
35732d01 | 1941 | |
c0b220cf DA |
1942 | rcu_read_lock(); |
1943 | ||
1944 | from = rcu_dereference(rt->from); | |
1945 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) | |
1946 | goto unlock; | |
1947 | ||
e659ba31 DA |
1948 | if (from->nh) { |
1949 | struct fib6_nh_match_arg arg = { | |
1950 | .dev = rt->dst.dev, | |
1951 | .gw = &rt->rt6i_gateway, | |
1952 | }; | |
1953 | ||
1954 | nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg); | |
1955 | ||
1956 | if (!arg.match) | |
cff6a327 | 1957 | goto unlock; |
e659ba31 DA |
1958 | fib6_nh = arg.match; |
1959 | } else { | |
1960 | fib6_nh = from->fib6_nh; | |
1961 | } | |
1962 | fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt); | |
193f3685 | 1963 | unlock: |
35732d01 WW |
1964 | rcu_read_unlock(); |
1965 | } | |
1966 | ||
e9fa1495 SB |
1967 | static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev, |
1968 | struct rt6_info *rt, int mtu) | |
1969 | { | |
1970 | /* If the new MTU is lower than the route PMTU, this new MTU will be the | |
1971 | * lowest MTU in the path: always allow updating the route PMTU to | |
1972 | * reflect PMTU decreases. | |
1973 | * | |
1974 | * If the new MTU is higher, and the route PMTU is equal to the local | |
1975 | * MTU, this means the old MTU is the lowest in the path, so allow | |
1976 | * updating it: if other nodes now have lower MTUs, PMTU discovery will | |
1977 | * handle this. | |
1978 | */ | |
1979 | ||
1980 | if (dst_mtu(&rt->dst) >= mtu) | |
1981 | return true; | |
1982 | ||
1983 | if (dst_mtu(&rt->dst) == idev->cnf.mtu6) | |
1984 | return true; | |
1985 | ||
1986 | return false; | |
1987 | } | |
1988 | ||
1989 | static void rt6_exceptions_update_pmtu(struct inet6_dev *idev, | |
cc5c073a | 1990 | const struct fib6_nh *nh, int mtu) |
f5bbe7ee WW |
1991 | { |
1992 | struct rt6_exception_bucket *bucket; | |
1993 | struct rt6_exception *rt6_ex; | |
1994 | int i; | |
1995 | ||
cc5c073a | 1996 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
e9fa1495 SB |
1997 | if (!bucket) |
1998 | return; | |
1999 | ||
2000 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2001 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
2002 | struct rt6_info *entry = rt6_ex->rt6i; | |
2003 | ||
2004 | /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected | |
d4ead6b3 | 2005 | * route), the metrics of its rt->from have already |
e9fa1495 SB |
2006 | * been updated. |
2007 | */ | |
d4ead6b3 | 2008 | if (dst_metric_raw(&entry->dst, RTAX_MTU) && |
e9fa1495 | 2009 | rt6_mtu_change_route_allowed(idev, entry, mtu)) |
d4ead6b3 | 2010 | dst_metric_set(&entry->dst, RTAX_MTU, mtu); |
f5bbe7ee | 2011 | } |
e9fa1495 | 2012 | bucket++; |
f5bbe7ee WW |
2013 | } |
2014 | } | |
2015 | ||
b16cb459 WW |
2016 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
2017 | ||
cc5c073a DA |
2018 | static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh, |
2019 | const struct in6_addr *gateway) | |
b16cb459 WW |
2020 | { |
2021 | struct rt6_exception_bucket *bucket; | |
2022 | struct rt6_exception *rt6_ex; | |
2023 | struct hlist_node *tmp; | |
2024 | int i; | |
2025 | ||
cc5c073a | 2026 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
b16cb459 WW |
2027 | return; |
2028 | ||
2029 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 2030 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
b16cb459 WW |
2031 | if (bucket) { |
2032 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2033 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2034 | &bucket->chain, hlist) { | |
2035 | struct rt6_info *entry = rt6_ex->rt6i; | |
2036 | ||
2037 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
2038 | RTF_CACHE_GATEWAY && | |
2039 | ipv6_addr_equal(gateway, | |
2040 | &entry->rt6i_gateway)) { | |
2041 | rt6_remove_exception(bucket, rt6_ex); | |
2042 | } | |
2043 | } | |
2044 | bucket++; | |
2045 | } | |
2046 | } | |
2047 | ||
2048 | spin_unlock_bh(&rt6_exception_lock); | |
2049 | } | |
2050 | ||
c757faa8 WW |
2051 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
2052 | struct rt6_exception *rt6_ex, | |
2053 | struct fib6_gc_args *gc_args, | |
2054 | unsigned long now) | |
2055 | { | |
2056 | struct rt6_info *rt = rt6_ex->rt6i; | |
2057 | ||
1859bac0 PA |
2058 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
2059 | * even if others have still references to them, so that on next | |
2060 | * dst_check() such references can be dropped. | |
2061 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
2062 | * expired, independently from their aging, as per RFC 8201 section 4 | |
2063 | */ | |
31afeb42 WW |
2064 | if (!(rt->rt6i_flags & RTF_EXPIRES)) { |
2065 | if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { | |
2066 | RT6_TRACE("aging clone %p\n", rt); | |
2067 | rt6_remove_exception(bucket, rt6_ex); | |
2068 | return; | |
2069 | } | |
2070 | } else if (time_after(jiffies, rt->dst.expires)) { | |
2071 | RT6_TRACE("purging expired route %p\n", rt); | |
c757faa8 WW |
2072 | rt6_remove_exception(bucket, rt6_ex); |
2073 | return; | |
31afeb42 WW |
2074 | } |
2075 | ||
2076 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
c757faa8 WW |
2077 | struct neighbour *neigh; |
2078 | __u8 neigh_flags = 0; | |
2079 | ||
1bfa26ff ED |
2080 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
2081 | if (neigh) | |
c757faa8 | 2082 | neigh_flags = neigh->flags; |
1bfa26ff | 2083 | |
c757faa8 WW |
2084 | if (!(neigh_flags & NTF_ROUTER)) { |
2085 | RT6_TRACE("purging route %p via non-router but gateway\n", | |
2086 | rt); | |
2087 | rt6_remove_exception(bucket, rt6_ex); | |
2088 | return; | |
2089 | } | |
2090 | } | |
31afeb42 | 2091 | |
c757faa8 WW |
2092 | gc_args->more++; |
2093 | } | |
2094 | ||
cc5c073a | 2095 | static void fib6_nh_age_exceptions(const struct fib6_nh *nh, |
c0b220cf DA |
2096 | struct fib6_gc_args *gc_args, |
2097 | unsigned long now) | |
c757faa8 WW |
2098 | { |
2099 | struct rt6_exception_bucket *bucket; | |
2100 | struct rt6_exception *rt6_ex; | |
2101 | struct hlist_node *tmp; | |
2102 | int i; | |
2103 | ||
cc5c073a | 2104 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
c757faa8 WW |
2105 | return; |
2106 | ||
1bfa26ff ED |
2107 | rcu_read_lock_bh(); |
2108 | spin_lock(&rt6_exception_lock); | |
cc5c073a | 2109 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
c757faa8 WW |
2110 | if (bucket) { |
2111 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2112 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2113 | &bucket->chain, hlist) { | |
2114 | rt6_age_examine_exception(bucket, rt6_ex, | |
2115 | gc_args, now); | |
2116 | } | |
2117 | bucket++; | |
2118 | } | |
2119 | } | |
1bfa26ff ED |
2120 | spin_unlock(&rt6_exception_lock); |
2121 | rcu_read_unlock_bh(); | |
c757faa8 WW |
2122 | } |
2123 | ||
e659ba31 DA |
2124 | struct fib6_nh_age_excptn_arg { |
2125 | struct fib6_gc_args *gc_args; | |
2126 | unsigned long now; | |
2127 | }; | |
2128 | ||
2129 | static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg) | |
2130 | { | |
2131 | struct fib6_nh_age_excptn_arg *arg = _arg; | |
2132 | ||
2133 | fib6_nh_age_exceptions(nh, arg->gc_args, arg->now); | |
2134 | return 0; | |
2135 | } | |
2136 | ||
cc5c073a | 2137 | void rt6_age_exceptions(struct fib6_info *f6i, |
c0b220cf DA |
2138 | struct fib6_gc_args *gc_args, |
2139 | unsigned long now) | |
2140 | { | |
e659ba31 DA |
2141 | if (f6i->nh) { |
2142 | struct fib6_nh_age_excptn_arg arg = { | |
2143 | .gc_args = gc_args, | |
2144 | .now = now | |
2145 | }; | |
2146 | ||
2147 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions, | |
2148 | &arg); | |
2149 | } else { | |
2150 | fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now); | |
2151 | } | |
c0b220cf DA |
2152 | } |
2153 | ||
1d053da9 | 2154 | /* must be called with rcu lock held */ |
effda4dd DA |
2155 | int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif, |
2156 | struct flowi6 *fl6, struct fib6_result *res, int strict) | |
1da177e4 | 2157 | { |
367efcb9 | 2158 | struct fib6_node *fn, *saved_fn; |
1da177e4 | 2159 | |
6454743b | 2160 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 2161 | saved_fn = fn; |
1da177e4 | 2162 | |
ca254490 DA |
2163 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
2164 | oif = 0; | |
2165 | ||
a3c00e46 | 2166 | redo_rt6_select: |
effda4dd DA |
2167 | rt6_select(net, fn, oif, res, strict); |
2168 | if (res->f6i == net->ipv6.fib6_null_entry) { | |
a3c00e46 MKL |
2169 | fn = fib6_backtrack(fn, &fl6->saddr); |
2170 | if (fn) | |
2171 | goto redo_rt6_select; | |
367efcb9 MKL |
2172 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
2173 | /* also consider unreachable route */ | |
2174 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
2175 | fn = saved_fn; | |
2176 | goto redo_rt6_select; | |
367efcb9 | 2177 | } |
a3c00e46 MKL |
2178 | } |
2179 | ||
effda4dd | 2180 | trace_fib6_table_lookup(net, res, table, fl6); |
fb9de91e | 2181 | |
effda4dd | 2182 | return 0; |
1d053da9 DA |
2183 | } |
2184 | ||
2185 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, | |
2186 | int oif, struct flowi6 *fl6, | |
2187 | const struct sk_buff *skb, int flags) | |
2188 | { | |
b1d40991 | 2189 | struct fib6_result res = {}; |
0e09edcc | 2190 | struct rt6_info *rt = NULL; |
1d053da9 DA |
2191 | int strict = 0; |
2192 | ||
0e09edcc WW |
2193 | WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) && |
2194 | !rcu_read_lock_held()); | |
2195 | ||
1d053da9 DA |
2196 | strict |= flags & RT6_LOOKUP_F_IFACE; |
2197 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; | |
2198 | if (net->ipv6.devconf_all->forwarding == 0) | |
2199 | strict |= RT6_LOOKUP_F_REACHABLE; | |
2200 | ||
2201 | rcu_read_lock(); | |
2202 | ||
effda4dd | 2203 | fib6_table_lookup(net, table, oif, fl6, &res, strict); |
0e09edcc WW |
2204 | if (res.f6i == net->ipv6.fib6_null_entry) |
2205 | goto out; | |
23fb93a4 | 2206 | |
b1d40991 | 2207 | fib6_select_path(net, &res, fl6, oif, false, skb, strict); |
d83009d4 | 2208 | |
23fb93a4 | 2209 | /*Search through exception table */ |
7e4b5128 | 2210 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 2211 | if (rt) { |
0e09edcc | 2212 | goto out; |
3da59bd9 | 2213 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
b1d40991 | 2214 | !res.nh->fib_nh_gw_family)) { |
3da59bd9 MKL |
2215 | /* Create a RTF_CACHE clone which will not be |
2216 | * owned by the fib6 tree. It is for the special case where | |
2217 | * the daddr in the skb during the neighbor look-up is different | |
2218 | * from the fl6->daddr used to look-up route here. | |
2219 | */ | |
0e09edcc | 2220 | rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL); |
c71099ac | 2221 | |
0e09edcc WW |
2222 | if (rt) { |
2223 | /* 1 refcnt is taken during ip6_rt_cache_alloc(). | |
2224 | * As rt6_uncached_list_add() does not consume refcnt, | |
2225 | * this refcnt is always returned to the caller even | |
2226 | * if caller sets RT6_LOOKUP_F_DST_NOREF flag. | |
1cfb71ee | 2227 | */ |
0e09edcc | 2228 | rt6_uncached_list_add(rt); |
81eb8447 | 2229 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
0e09edcc | 2230 | rcu_read_unlock(); |
b811580d | 2231 | |
0e09edcc WW |
2232 | return rt; |
2233 | } | |
d52d3997 MKL |
2234 | } else { |
2235 | /* Get a percpu copy */ | |
951f788a | 2236 | local_bh_disable(); |
0e09edcc | 2237 | rt = rt6_get_pcpu_route(&res); |
d52d3997 | 2238 | |
0e09edcc WW |
2239 | if (!rt) |
2240 | rt = rt6_make_pcpu_route(net, &res); | |
93531c67 | 2241 | |
951f788a | 2242 | local_bh_enable(); |
d52d3997 | 2243 | } |
0e09edcc WW |
2244 | out: |
2245 | if (!rt) | |
2246 | rt = net->ipv6.ip6_null_entry; | |
2247 | if (!(flags & RT6_LOOKUP_F_DST_NOREF)) | |
2248 | ip6_hold_safe(net, &rt); | |
2249 | rcu_read_unlock(); | |
2250 | ||
2251 | return rt; | |
1da177e4 | 2252 | } |
9ff74384 | 2253 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 2254 | |
b75cc8f9 DA |
2255 | static struct rt6_info *ip6_pol_route_input(struct net *net, |
2256 | struct fib6_table *table, | |
2257 | struct flowi6 *fl6, | |
2258 | const struct sk_buff *skb, | |
2259 | int flags) | |
4acad72d | 2260 | { |
b75cc8f9 | 2261 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags); |
4acad72d PE |
2262 | } |
2263 | ||
d409b847 MB |
2264 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
2265 | struct net_device *dev, | |
b75cc8f9 DA |
2266 | struct flowi6 *fl6, |
2267 | const struct sk_buff *skb, | |
2268 | int flags) | |
72331bc0 SL |
2269 | { |
2270 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
2271 | flags |= RT6_LOOKUP_F_IFACE; | |
2272 | ||
b75cc8f9 | 2273 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input); |
72331bc0 | 2274 | } |
d409b847 | 2275 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 2276 | |
23aebdac | 2277 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
5e5d6fed RP |
2278 | struct flow_keys *keys, |
2279 | struct flow_keys *flkeys) | |
23aebdac JS |
2280 | { |
2281 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
2282 | const struct ipv6hdr *key_iph = outer_iph; | |
5e5d6fed | 2283 | struct flow_keys *_flkeys = flkeys; |
23aebdac JS |
2284 | const struct ipv6hdr *inner_iph; |
2285 | const struct icmp6hdr *icmph; | |
2286 | struct ipv6hdr _inner_iph; | |
cea67a2d | 2287 | struct icmp6hdr _icmph; |
23aebdac JS |
2288 | |
2289 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
2290 | goto out; | |
2291 | ||
cea67a2d ED |
2292 | icmph = skb_header_pointer(skb, skb_transport_offset(skb), |
2293 | sizeof(_icmph), &_icmph); | |
2294 | if (!icmph) | |
2295 | goto out; | |
2296 | ||
54074f1d | 2297 | if (!icmpv6_is_err(icmph->icmp6_type)) |
23aebdac JS |
2298 | goto out; |
2299 | ||
2300 | inner_iph = skb_header_pointer(skb, | |
2301 | skb_transport_offset(skb) + sizeof(*icmph), | |
2302 | sizeof(_inner_iph), &_inner_iph); | |
2303 | if (!inner_iph) | |
2304 | goto out; | |
2305 | ||
2306 | key_iph = inner_iph; | |
5e5d6fed | 2307 | _flkeys = NULL; |
23aebdac | 2308 | out: |
5e5d6fed RP |
2309 | if (_flkeys) { |
2310 | keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src; | |
2311 | keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst; | |
2312 | keys->tags.flow_label = _flkeys->tags.flow_label; | |
2313 | keys->basic.ip_proto = _flkeys->basic.ip_proto; | |
2314 | } else { | |
2315 | keys->addrs.v6addrs.src = key_iph->saddr; | |
2316 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
fa1be7e0 | 2317 | keys->tags.flow_label = ip6_flowlabel(key_iph); |
5e5d6fed RP |
2318 | keys->basic.ip_proto = key_iph->nexthdr; |
2319 | } | |
23aebdac JS |
2320 | } |
2321 | ||
2322 | /* if skb is set it will be used and fl6 can be NULL */ | |
b4bac172 DA |
2323 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
2324 | const struct sk_buff *skb, struct flow_keys *flkeys) | |
23aebdac JS |
2325 | { |
2326 | struct flow_keys hash_keys; | |
9a2a537a | 2327 | u32 mhash; |
23aebdac | 2328 | |
bbfa047a | 2329 | switch (ip6_multipath_hash_policy(net)) { |
b4bac172 DA |
2330 | case 0: |
2331 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2332 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2333 | if (skb) { | |
2334 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2335 | } else { | |
2336 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2337 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
fa1be7e0 | 2338 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
b4bac172 DA |
2339 | hash_keys.basic.ip_proto = fl6->flowi6_proto; |
2340 | } | |
2341 | break; | |
2342 | case 1: | |
2343 | if (skb) { | |
2344 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
2345 | struct flow_keys keys; | |
2346 | ||
2347 | /* short-circuit if we already have L4 hash present */ | |
2348 | if (skb->l4_hash) | |
2349 | return skb_get_hash_raw(skb) >> 1; | |
2350 | ||
2351 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2352 | ||
2353 | if (!flkeys) { | |
2354 | skb_flow_dissect_flow_keys(skb, &keys, flag); | |
2355 | flkeys = &keys; | |
2356 | } | |
2357 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2358 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2359 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2360 | hash_keys.ports.src = flkeys->ports.src; | |
2361 | hash_keys.ports.dst = flkeys->ports.dst; | |
2362 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2363 | } else { | |
2364 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2365 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2366 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2367 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2368 | hash_keys.ports.src = fl6->fl6_sport; | |
2369 | hash_keys.ports.dst = fl6->fl6_dport; | |
2370 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2371 | } | |
2372 | break; | |
d8f74f09 SS |
2373 | case 2: |
2374 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2375 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2376 | if (skb) { | |
2377 | struct flow_keys keys; | |
2378 | ||
2379 | if (!flkeys) { | |
2380 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2381 | flkeys = &keys; | |
2382 | } | |
2383 | ||
2384 | /* Inner can be v4 or v6 */ | |
2385 | if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2386 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2387 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
2388 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
2389 | } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2390 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2391 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2392 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2393 | hash_keys.tags.flow_label = flkeys->tags.flow_label; | |
2394 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2395 | } else { | |
2396 | /* Same as case 0 */ | |
2397 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2398 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2399 | } | |
2400 | } else { | |
2401 | /* Same as case 0 */ | |
2402 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2403 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2404 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2405 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2406 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2407 | } | |
2408 | break; | |
23aebdac | 2409 | } |
9a2a537a | 2410 | mhash = flow_hash_from_keys(&hash_keys); |
23aebdac | 2411 | |
9a2a537a | 2412 | return mhash >> 1; |
23aebdac JS |
2413 | } |
2414 | ||
67f415dd | 2415 | /* Called with rcu held */ |
c71099ac TG |
2416 | void ip6_route_input(struct sk_buff *skb) |
2417 | { | |
b71d1d42 | 2418 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 2419 | struct net *net = dev_net(skb->dev); |
67f415dd | 2420 | int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF; |
904af04d | 2421 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 2422 | struct flowi6 fl6 = { |
e0d56fdd | 2423 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
2424 | .daddr = iph->daddr, |
2425 | .saddr = iph->saddr, | |
6502ca52 | 2426 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
2427 | .flowi6_mark = skb->mark, |
2428 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 2429 | }; |
5e5d6fed | 2430 | struct flow_keys *flkeys = NULL, _flkeys; |
adaa70bb | 2431 | |
904af04d | 2432 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2433 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 2434 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
5e5d6fed RP |
2435 | |
2436 | if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys)) | |
2437 | flkeys = &_flkeys; | |
2438 | ||
23aebdac | 2439 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
b4bac172 | 2440 | fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys); |
06e9d040 | 2441 | skb_dst_drop(skb); |
67f415dd WW |
2442 | skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev, |
2443 | &fl6, skb, flags)); | |
c71099ac TG |
2444 | } |
2445 | ||
b75cc8f9 DA |
2446 | static struct rt6_info *ip6_pol_route_output(struct net *net, |
2447 | struct fib6_table *table, | |
2448 | struct flowi6 *fl6, | |
2449 | const struct sk_buff *skb, | |
2450 | int flags) | |
1da177e4 | 2451 | { |
b75cc8f9 | 2452 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags); |
c71099ac TG |
2453 | } |
2454 | ||
7d9e5f42 WW |
2455 | struct dst_entry *ip6_route_output_flags_noref(struct net *net, |
2456 | const struct sock *sk, | |
2457 | struct flowi6 *fl6, int flags) | |
c71099ac | 2458 | { |
d46a9d67 | 2459 | bool any_src; |
c71099ac | 2460 | |
3ede0bbc RS |
2461 | if (ipv6_addr_type(&fl6->daddr) & |
2462 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) { | |
4c1feac5 DA |
2463 | struct dst_entry *dst; |
2464 | ||
7d9e5f42 | 2465 | /* This function does not take refcnt on the dst */ |
4c1feac5 DA |
2466 | dst = l3mdev_link_scope_lookup(net, fl6); |
2467 | if (dst) | |
2468 | return dst; | |
2469 | } | |
ca254490 | 2470 | |
1fb9489b | 2471 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 2472 | |
7d9e5f42 | 2473 | flags |= RT6_LOOKUP_F_DST_NOREF; |
d46a9d67 | 2474 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 2475 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 2476 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 2477 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 2478 | |
d46a9d67 | 2479 | if (!any_src) |
adaa70bb | 2480 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
2481 | else if (sk) |
2482 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 2483 | |
b75cc8f9 | 2484 | return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output); |
1da177e4 | 2485 | } |
7d9e5f42 WW |
2486 | EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref); |
2487 | ||
2488 | struct dst_entry *ip6_route_output_flags(struct net *net, | |
2489 | const struct sock *sk, | |
2490 | struct flowi6 *fl6, | |
2491 | int flags) | |
2492 | { | |
2493 | struct dst_entry *dst; | |
2494 | struct rt6_info *rt6; | |
2495 | ||
2496 | rcu_read_lock(); | |
2497 | dst = ip6_route_output_flags_noref(net, sk, fl6, flags); | |
2498 | rt6 = (struct rt6_info *)dst; | |
2499 | /* For dst cached in uncached_list, refcnt is already taken. */ | |
2500 | if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) { | |
2501 | dst = &net->ipv6.ip6_null_entry->dst; | |
2502 | dst_hold(dst); | |
2503 | } | |
2504 | rcu_read_unlock(); | |
2505 | ||
2506 | return dst; | |
2507 | } | |
6f21c96a | 2508 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 2509 | |
2774c131 | 2510 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2511 | { |
5c1e6aa3 | 2512 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
1dbe3252 | 2513 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
2514 | struct dst_entry *new = NULL; |
2515 | ||
1dbe3252 | 2516 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1, |
62cf27e5 | 2517 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2518 | if (rt) { |
0a1f5962 | 2519 | rt6_info_init(rt); |
81eb8447 | 2520 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 2521 | |
0a1f5962 | 2522 | new = &rt->dst; |
14e50e57 | 2523 | new->__use = 1; |
352e512c | 2524 | new->input = dst_discard; |
ede2059d | 2525 | new->output = dst_discard_out; |
14e50e57 | 2526 | |
0a1f5962 | 2527 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 2528 | |
1dbe3252 | 2529 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 2530 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 2531 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
2532 | |
2533 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
2534 | #ifdef CONFIG_IPV6_SUBTREES | |
2535 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
2536 | #endif | |
14e50e57 DM |
2537 | } |
2538 | ||
69ead7af DM |
2539 | dst_release(dst_orig); |
2540 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 2541 | } |
14e50e57 | 2542 | |
1da177e4 LT |
2543 | /* |
2544 | * Destination cache support functions | |
2545 | */ | |
2546 | ||
8d1c802b | 2547 | static bool fib6_check(struct fib6_info *f6i, u32 cookie) |
4b32b5ad | 2548 | { |
93531c67 DA |
2549 | u32 rt_cookie = 0; |
2550 | ||
8ae86971 | 2551 | if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie) |
93531c67 DA |
2552 | return false; |
2553 | ||
2554 | if (fib6_check_expired(f6i)) | |
2555 | return false; | |
2556 | ||
2557 | return true; | |
4b32b5ad MKL |
2558 | } |
2559 | ||
a68886a6 DA |
2560 | static struct dst_entry *rt6_check(struct rt6_info *rt, |
2561 | struct fib6_info *from, | |
2562 | u32 cookie) | |
3da59bd9 | 2563 | { |
36143645 | 2564 | u32 rt_cookie = 0; |
c5cff856 | 2565 | |
49d05fe2 | 2566 | if (!from || !fib6_get_cookie_safe(from, &rt_cookie) || |
93531c67 | 2567 | rt_cookie != cookie) |
3da59bd9 MKL |
2568 | return NULL; |
2569 | ||
2570 | if (rt6_check_expired(rt)) | |
2571 | return NULL; | |
2572 | ||
2573 | return &rt->dst; | |
2574 | } | |
2575 | ||
a68886a6 DA |
2576 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, |
2577 | struct fib6_info *from, | |
2578 | u32 cookie) | |
3da59bd9 | 2579 | { |
5973fb1e MKL |
2580 | if (!__rt6_check_expired(rt) && |
2581 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
a68886a6 | 2582 | fib6_check(from, cookie)) |
3da59bd9 MKL |
2583 | return &rt->dst; |
2584 | else | |
2585 | return NULL; | |
2586 | } | |
2587 | ||
1da177e4 LT |
2588 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
2589 | { | |
a87b7dc9 | 2590 | struct dst_entry *dst_ret; |
a68886a6 | 2591 | struct fib6_info *from; |
1da177e4 LT |
2592 | struct rt6_info *rt; |
2593 | ||
a87b7dc9 DA |
2594 | rt = container_of(dst, struct rt6_info, dst); |
2595 | ||
2596 | rcu_read_lock(); | |
1da177e4 | 2597 | |
6f3118b5 ND |
2598 | /* All IPV6 dsts are created with ->obsolete set to the value |
2599 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
2600 | * into this function always. | |
2601 | */ | |
e3bc10bd | 2602 | |
a68886a6 | 2603 | from = rcu_dereference(rt->from); |
4b32b5ad | 2604 | |
a68886a6 DA |
2605 | if (from && (rt->rt6i_flags & RTF_PCPU || |
2606 | unlikely(!list_empty(&rt->rt6i_uncached)))) | |
2607 | dst_ret = rt6_dst_from_check(rt, from, cookie); | |
3da59bd9 | 2608 | else |
a68886a6 | 2609 | dst_ret = rt6_check(rt, from, cookie); |
a87b7dc9 DA |
2610 | |
2611 | rcu_read_unlock(); | |
2612 | ||
2613 | return dst_ret; | |
1da177e4 LT |
2614 | } |
2615 | ||
2616 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
2617 | { | |
2618 | struct rt6_info *rt = (struct rt6_info *) dst; | |
2619 | ||
2620 | if (rt) { | |
54c1a859 | 2621 | if (rt->rt6i_flags & RTF_CACHE) { |
c3c14da0 | 2622 | rcu_read_lock(); |
54c1a859 | 2623 | if (rt6_check_expired(rt)) { |
93531c67 | 2624 | rt6_remove_exception_rt(rt); |
54c1a859 YH |
2625 | dst = NULL; |
2626 | } | |
c3c14da0 | 2627 | rcu_read_unlock(); |
54c1a859 | 2628 | } else { |
1da177e4 | 2629 | dst_release(dst); |
54c1a859 YH |
2630 | dst = NULL; |
2631 | } | |
1da177e4 | 2632 | } |
54c1a859 | 2633 | return dst; |
1da177e4 LT |
2634 | } |
2635 | ||
2636 | static void ip6_link_failure(struct sk_buff *skb) | |
2637 | { | |
2638 | struct rt6_info *rt; | |
2639 | ||
3ffe533c | 2640 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2641 | |
adf30907 | 2642 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 2643 | if (rt) { |
8a14e46f | 2644 | rcu_read_lock(); |
1eb4f758 | 2645 | if (rt->rt6i_flags & RTF_CACHE) { |
761f6026 | 2646 | rt6_remove_exception_rt(rt); |
c5cff856 | 2647 | } else { |
a68886a6 | 2648 | struct fib6_info *from; |
c5cff856 WW |
2649 | struct fib6_node *fn; |
2650 | ||
a68886a6 DA |
2651 | from = rcu_dereference(rt->from); |
2652 | if (from) { | |
2653 | fn = rcu_dereference(from->fib6_node); | |
2654 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
2655 | fn->fn_sernum = -1; | |
2656 | } | |
1eb4f758 | 2657 | } |
8a14e46f | 2658 | rcu_read_unlock(); |
1da177e4 LT |
2659 | } |
2660 | } | |
2661 | ||
6a3e030f DA |
2662 | static void rt6_update_expires(struct rt6_info *rt0, int timeout) |
2663 | { | |
a68886a6 DA |
2664 | if (!(rt0->rt6i_flags & RTF_EXPIRES)) { |
2665 | struct fib6_info *from; | |
2666 | ||
2667 | rcu_read_lock(); | |
2668 | from = rcu_dereference(rt0->from); | |
2669 | if (from) | |
2670 | rt0->dst.expires = from->expires; | |
2671 | rcu_read_unlock(); | |
2672 | } | |
6a3e030f DA |
2673 | |
2674 | dst_set_expires(&rt0->dst, timeout); | |
2675 | rt0->rt6i_flags |= RTF_EXPIRES; | |
2676 | } | |
2677 | ||
45e4fd26 MKL |
2678 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2679 | { | |
2680 | struct net *net = dev_net(rt->dst.dev); | |
2681 | ||
d4ead6b3 | 2682 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
45e4fd26 | 2683 | rt->rt6i_flags |= RTF_MODIFIED; |
45e4fd26 MKL |
2684 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
2685 | } | |
2686 | ||
0d3f6d29 MKL |
2687 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2688 | { | |
2689 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1490ed2a | 2690 | (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from)); |
0d3f6d29 MKL |
2691 | } |
2692 | ||
45e4fd26 | 2693 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
bd085ef6 HL |
2694 | const struct ipv6hdr *iph, u32 mtu, |
2695 | bool confirm_neigh) | |
1da177e4 | 2696 | { |
0dec879f | 2697 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 2698 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 2699 | |
19bda36c XL |
2700 | if (dst_metric_locked(dst, RTAX_MTU)) |
2701 | return; | |
2702 | ||
0dec879f JA |
2703 | if (iph) { |
2704 | daddr = &iph->daddr; | |
2705 | saddr = &iph->saddr; | |
2706 | } else if (sk) { | |
2707 | daddr = &sk->sk_v6_daddr; | |
2708 | saddr = &inet6_sk(sk)->saddr; | |
2709 | } else { | |
2710 | daddr = NULL; | |
2711 | saddr = NULL; | |
2712 | } | |
bd085ef6 HL |
2713 | |
2714 | if (confirm_neigh) | |
2715 | dst_confirm_neigh(dst, daddr); | |
2716 | ||
45e4fd26 MKL |
2717 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); |
2718 | if (mtu >= dst_mtu(dst)) | |
2719 | return; | |
9d289715 | 2720 | |
0d3f6d29 | 2721 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2722 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2723 | /* update rt6_ex->stamp for cache */ |
2724 | if (rt6->rt6i_flags & RTF_CACHE) | |
2725 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2726 | } else if (daddr) { |
85bd05de | 2727 | struct fib6_result res = {}; |
45e4fd26 MKL |
2728 | struct rt6_info *nrt6; |
2729 | ||
4d85cd0c | 2730 | rcu_read_lock(); |
85bd05de | 2731 | res.f6i = rcu_dereference(rt6->from); |
43a4b60d DA |
2732 | if (!res.f6i) |
2733 | goto out_unlock; | |
2734 | ||
7d21fec9 DA |
2735 | res.fib6_flags = res.f6i->fib6_flags; |
2736 | res.fib6_type = res.f6i->fib6_type; | |
2737 | ||
2d44234b DA |
2738 | if (res.f6i->nh) { |
2739 | struct fib6_nh_match_arg arg = { | |
2740 | .dev = dst->dev, | |
2741 | .gw = &rt6->rt6i_gateway, | |
2742 | }; | |
2743 | ||
2744 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
2745 | fib6_nh_find_match, &arg); | |
2746 | ||
2747 | /* fib6_info uses a nexthop that does not have fib6_nh | |
2748 | * using the dst->dev + gw. Should be impossible. | |
2749 | */ | |
43a4b60d DA |
2750 | if (!arg.match) |
2751 | goto out_unlock; | |
2d44234b DA |
2752 | |
2753 | res.nh = arg.match; | |
2754 | } else { | |
2755 | res.nh = res.f6i->fib6_nh; | |
2756 | } | |
2757 | ||
85bd05de | 2758 | nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr); |
45e4fd26 MKL |
2759 | if (nrt6) { |
2760 | rt6_do_update_pmtu(nrt6, mtu); | |
5012f0a5 | 2761 | if (rt6_insert_exception(nrt6, &res)) |
2b760fcf | 2762 | dst_release_immediate(&nrt6->dst); |
45e4fd26 | 2763 | } |
43a4b60d | 2764 | out_unlock: |
a68886a6 | 2765 | rcu_read_unlock(); |
1da177e4 LT |
2766 | } |
2767 | } | |
2768 | ||
45e4fd26 | 2769 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
2770 | struct sk_buff *skb, u32 mtu, |
2771 | bool confirm_neigh) | |
45e4fd26 | 2772 | { |
bd085ef6 HL |
2773 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu, |
2774 | confirm_neigh); | |
45e4fd26 MKL |
2775 | } |
2776 | ||
42ae66c8 | 2777 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2778 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2779 | { |
2780 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2781 | struct dst_entry *dst; | |
dc92095d MŻ |
2782 | struct flowi6 fl6 = { |
2783 | .flowi6_oif = oif, | |
2784 | .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark), | |
2785 | .daddr = iph->daddr, | |
2786 | .saddr = iph->saddr, | |
2787 | .flowlabel = ip6_flowinfo(iph), | |
2788 | .flowi6_uid = uid, | |
2789 | }; | |
81aded24 DM |
2790 | |
2791 | dst = ip6_route_output(net, NULL, &fl6); | |
2792 | if (!dst->error) | |
bd085ef6 | 2793 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true); |
81aded24 DM |
2794 | dst_release(dst); |
2795 | } | |
2796 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2797 | ||
2798 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2799 | { | |
7ddacfa5 | 2800 | int oif = sk->sk_bound_dev_if; |
33c162a9 MKL |
2801 | struct dst_entry *dst; |
2802 | ||
7ddacfa5 DA |
2803 | if (!oif && skb->dev) |
2804 | oif = l3mdev_master_ifindex(skb->dev); | |
2805 | ||
2806 | ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid); | |
33c162a9 MKL |
2807 | |
2808 | dst = __sk_dst_get(sk); | |
2809 | if (!dst || !dst->obsolete || | |
2810 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2811 | return; | |
2812 | ||
2813 | bh_lock_sock(sk); | |
2814 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2815 | ip6_datagram_dst_update(sk, false); | |
2816 | bh_unlock_sock(sk); | |
81aded24 DM |
2817 | } |
2818 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2819 | ||
7d6850f7 AK |
2820 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
2821 | const struct flowi6 *fl6) | |
2822 | { | |
2823 | #ifdef CONFIG_IPV6_SUBTREES | |
2824 | struct ipv6_pinfo *np = inet6_sk(sk); | |
2825 | #endif | |
2826 | ||
2827 | ip6_dst_store(sk, dst, | |
2828 | ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ? | |
2829 | &sk->sk_v6_daddr : NULL, | |
2830 | #ifdef CONFIG_IPV6_SUBTREES | |
2831 | ipv6_addr_equal(&fl6->saddr, &np->saddr) ? | |
2832 | &np->saddr : | |
2833 | #endif | |
2834 | NULL); | |
2835 | } | |
2836 | ||
9b6b35ab | 2837 | static bool ip6_redirect_nh_match(const struct fib6_result *res, |
0b34eb00 DA |
2838 | struct flowi6 *fl6, |
2839 | const struct in6_addr *gw, | |
2840 | struct rt6_info **ret) | |
2841 | { | |
9b6b35ab DA |
2842 | const struct fib6_nh *nh = res->nh; |
2843 | ||
0b34eb00 DA |
2844 | if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family || |
2845 | fl6->flowi6_oif != nh->fib_nh_dev->ifindex) | |
2846 | return false; | |
2847 | ||
2848 | /* rt_cache's gateway might be different from its 'parent' | |
2849 | * in the case of an ip redirect. | |
2850 | * So we keep searching in the exception table if the gateway | |
2851 | * is different. | |
2852 | */ | |
2853 | if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) { | |
2854 | struct rt6_info *rt_cache; | |
2855 | ||
9b6b35ab | 2856 | rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr); |
0b34eb00 DA |
2857 | if (rt_cache && |
2858 | ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) { | |
2859 | *ret = rt_cache; | |
2860 | return true; | |
2861 | } | |
2862 | return false; | |
2863 | } | |
2864 | return true; | |
2865 | } | |
2866 | ||
c55c8988 DA |
2867 | struct fib6_nh_rd_arg { |
2868 | struct fib6_result *res; | |
2869 | struct flowi6 *fl6; | |
2870 | const struct in6_addr *gw; | |
2871 | struct rt6_info **ret; | |
2872 | }; | |
2873 | ||
2874 | static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg) | |
2875 | { | |
2876 | struct fib6_nh_rd_arg *arg = _arg; | |
2877 | ||
2878 | arg->res->nh = nh; | |
2879 | return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret); | |
2880 | } | |
2881 | ||
b55b76b2 DJ |
2882 | /* Handle redirects */ |
2883 | struct ip6rd_flowi { | |
2884 | struct flowi6 fl6; | |
2885 | struct in6_addr gateway; | |
2886 | }; | |
2887 | ||
2888 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
2889 | struct fib6_table *table, | |
2890 | struct flowi6 *fl6, | |
b75cc8f9 | 2891 | const struct sk_buff *skb, |
b55b76b2 DJ |
2892 | int flags) |
2893 | { | |
2894 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
0b34eb00 | 2895 | struct rt6_info *ret = NULL; |
9b6b35ab | 2896 | struct fib6_result res = {}; |
c55c8988 DA |
2897 | struct fib6_nh_rd_arg arg = { |
2898 | .res = &res, | |
2899 | .fl6 = fl6, | |
2900 | .gw = &rdfl->gateway, | |
2901 | .ret = &ret | |
2902 | }; | |
8d1c802b | 2903 | struct fib6_info *rt; |
b55b76b2 DJ |
2904 | struct fib6_node *fn; |
2905 | ||
31680ac2 DA |
2906 | /* l3mdev_update_flow overrides oif if the device is enslaved; in |
2907 | * this case we must match on the real ingress device, so reset it | |
2908 | */ | |
2909 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) | |
2910 | fl6->flowi6_oif = skb->dev->ifindex; | |
2911 | ||
b55b76b2 | 2912 | /* Get the "current" route for this destination and |
67c408cf | 2913 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
2914 | * |
2915 | * RFC 4861 specifies that redirects should only be | |
2916 | * accepted if they come from the nexthop to the target. | |
2917 | * Due to the way the routes are chosen, this notion | |
2918 | * is a bit fuzzy and one might need to check all possible | |
2919 | * routes. | |
2920 | */ | |
2921 | ||
66f5d6ce | 2922 | rcu_read_lock(); |
6454743b | 2923 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
b55b76b2 | 2924 | restart: |
66f5d6ce | 2925 | for_each_fib6_node_rt_rcu(fn) { |
9b6b35ab | 2926 | res.f6i = rt; |
14895687 | 2927 | if (fib6_check_expired(rt)) |
b55b76b2 | 2928 | continue; |
93c2fb25 | 2929 | if (rt->fib6_flags & RTF_REJECT) |
b55b76b2 | 2930 | break; |
c55c8988 DA |
2931 | if (unlikely(rt->nh)) { |
2932 | if (nexthop_is_blackhole(rt->nh)) | |
2933 | continue; | |
2934 | /* on match, res->nh is filled in and potentially ret */ | |
2935 | if (nexthop_for_each_fib6_nh(rt->nh, | |
2936 | fib6_nh_redirect_match, | |
2937 | &arg)) | |
2938 | goto out; | |
2939 | } else { | |
2940 | res.nh = rt->fib6_nh; | |
2941 | if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, | |
2942 | &ret)) | |
2943 | goto out; | |
2944 | } | |
b55b76b2 DJ |
2945 | } |
2946 | ||
2947 | if (!rt) | |
421842ed | 2948 | rt = net->ipv6.fib6_null_entry; |
93c2fb25 | 2949 | else if (rt->fib6_flags & RTF_REJECT) { |
23fb93a4 | 2950 | ret = net->ipv6.ip6_null_entry; |
b0a1ba59 MKL |
2951 | goto out; |
2952 | } | |
2953 | ||
421842ed | 2954 | if (rt == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
2955 | fn = fib6_backtrack(fn, &fl6->saddr); |
2956 | if (fn) | |
2957 | goto restart; | |
b55b76b2 | 2958 | } |
a3c00e46 | 2959 | |
9b6b35ab | 2960 | res.f6i = rt; |
1cf844c7 | 2961 | res.nh = rt->fib6_nh; |
b0a1ba59 | 2962 | out: |
7d21fec9 | 2963 | if (ret) { |
10585b43 | 2964 | ip6_hold_safe(net, &ret); |
7d21fec9 DA |
2965 | } else { |
2966 | res.fib6_flags = res.f6i->fib6_flags; | |
2967 | res.fib6_type = res.f6i->fib6_type; | |
9b6b35ab | 2968 | ret = ip6_create_rt_rcu(&res); |
7d21fec9 | 2969 | } |
b55b76b2 | 2970 | |
66f5d6ce | 2971 | rcu_read_unlock(); |
b55b76b2 | 2972 | |
8ff2e5b2 | 2973 | trace_fib6_table_lookup(net, &res, table, fl6); |
23fb93a4 | 2974 | return ret; |
b55b76b2 DJ |
2975 | }; |
2976 | ||
2977 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
b75cc8f9 DA |
2978 | const struct flowi6 *fl6, |
2979 | const struct sk_buff *skb, | |
2980 | const struct in6_addr *gateway) | |
b55b76b2 DJ |
2981 | { |
2982 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
2983 | struct ip6rd_flowi rdfl; | |
2984 | ||
2985 | rdfl.fl6 = *fl6; | |
2986 | rdfl.gateway = *gateway; | |
2987 | ||
b75cc8f9 | 2988 | return fib6_rule_lookup(net, &rdfl.fl6, skb, |
b55b76b2 DJ |
2989 | flags, __ip6_route_redirect); |
2990 | } | |
2991 | ||
e2d118a1 LC |
2992 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
2993 | kuid_t uid) | |
3a5ad2ee DM |
2994 | { |
2995 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2996 | struct dst_entry *dst; | |
1f7f10ac MŻ |
2997 | struct flowi6 fl6 = { |
2998 | .flowi6_iif = LOOPBACK_IFINDEX, | |
2999 | .flowi6_oif = oif, | |
3000 | .flowi6_mark = mark, | |
3001 | .daddr = iph->daddr, | |
3002 | .saddr = iph->saddr, | |
3003 | .flowlabel = ip6_flowinfo(iph), | |
3004 | .flowi6_uid = uid, | |
3005 | }; | |
3a5ad2ee | 3006 | |
b75cc8f9 | 3007 | dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr); |
b55b76b2 | 3008 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
3009 | dst_release(dst); |
3010 | } | |
3011 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
3012 | ||
d456336d | 3013 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif) |
c92a59ec DJ |
3014 | { |
3015 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
3016 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
3017 | struct dst_entry *dst; | |
0b26fb17 MŻ |
3018 | struct flowi6 fl6 = { |
3019 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3020 | .flowi6_oif = oif, | |
0b26fb17 MŻ |
3021 | .daddr = msg->dest, |
3022 | .saddr = iph->daddr, | |
3023 | .flowi6_uid = sock_net_uid(net, NULL), | |
3024 | }; | |
c92a59ec | 3025 | |
b75cc8f9 | 3026 | dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr); |
b55b76b2 | 3027 | rt6_do_redirect(dst, NULL, skb); |
c92a59ec DJ |
3028 | dst_release(dst); |
3029 | } | |
3030 | ||
3a5ad2ee DM |
3031 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
3032 | { | |
e2d118a1 LC |
3033 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
3034 | sk->sk_uid); | |
3a5ad2ee DM |
3035 | } |
3036 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
3037 | ||
0dbaee3b | 3038 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 3039 | { |
0dbaee3b DM |
3040 | struct net_device *dev = dst->dev; |
3041 | unsigned int mtu = dst_mtu(dst); | |
3042 | struct net *net = dev_net(dev); | |
3043 | ||
1da177e4 LT |
3044 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
3045 | ||
5578689a DL |
3046 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
3047 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
3048 | |
3049 | /* | |
1ab1457c YH |
3050 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
3051 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
3052 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
3053 | * rely only on pmtu discovery" |
3054 | */ | |
3055 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
3056 | mtu = IPV6_MAXPLEN; | |
3057 | return mtu; | |
3058 | } | |
3059 | ||
ebb762f2 | 3060 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 3061 | { |
d33e4553 | 3062 | struct inet6_dev *idev; |
d4ead6b3 | 3063 | unsigned int mtu; |
4b32b5ad MKL |
3064 | |
3065 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 3066 | if (mtu) |
30f78d8e | 3067 | goto out; |
618f9bc7 SK |
3068 | |
3069 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
3070 | |
3071 | rcu_read_lock(); | |
3072 | idev = __in6_dev_get(dst->dev); | |
3073 | if (idev) | |
3074 | mtu = idev->cnf.mtu6; | |
3075 | rcu_read_unlock(); | |
3076 | ||
30f78d8e | 3077 | out: |
14972cbd RP |
3078 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
3079 | ||
3080 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
3081 | } |
3082 | ||
901731b8 DA |
3083 | /* MTU selection: |
3084 | * 1. mtu on route is locked - use it | |
3085 | * 2. mtu from nexthop exception | |
3086 | * 3. mtu from egress device | |
3087 | * | |
3088 | * based on ip6_dst_mtu_forward and exception logic of | |
3089 | * rt6_find_cached_rt; called with rcu_read_lock | |
3090 | */ | |
b748f260 DA |
3091 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
3092 | const struct in6_addr *daddr, | |
3093 | const struct in6_addr *saddr) | |
901731b8 | 3094 | { |
b748f260 DA |
3095 | const struct fib6_nh *nh = res->nh; |
3096 | struct fib6_info *f6i = res->f6i; | |
901731b8 | 3097 | struct inet6_dev *idev; |
510e2ced | 3098 | struct rt6_info *rt; |
901731b8 DA |
3099 | u32 mtu = 0; |
3100 | ||
3101 | if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) { | |
3102 | mtu = f6i->fib6_pmtu; | |
3103 | if (mtu) | |
3104 | goto out; | |
3105 | } | |
3106 | ||
510e2ced WW |
3107 | rt = rt6_find_cached_rt(res, daddr, saddr); |
3108 | if (unlikely(rt)) { | |
3109 | mtu = dst_metric_raw(&rt->dst, RTAX_MTU); | |
3110 | } else { | |
b748f260 | 3111 | struct net_device *dev = nh->fib_nh_dev; |
901731b8 DA |
3112 | |
3113 | mtu = IPV6_MIN_MTU; | |
3114 | idev = __in6_dev_get(dev); | |
3115 | if (idev && idev->cnf.mtu6 > mtu) | |
3116 | mtu = idev->cnf.mtu6; | |
3117 | } | |
3118 | ||
3119 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); | |
3120 | out: | |
b748f260 | 3121 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
901731b8 DA |
3122 | } |
3123 | ||
3b00944c | 3124 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 3125 | struct flowi6 *fl6) |
1da177e4 | 3126 | { |
87a11578 | 3127 | struct dst_entry *dst; |
1da177e4 LT |
3128 | struct rt6_info *rt; |
3129 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 3130 | struct net *net = dev_net(dev); |
1da177e4 | 3131 | |
38308473 | 3132 | if (unlikely(!idev)) |
122bdf67 | 3133 | return ERR_PTR(-ENODEV); |
1da177e4 | 3134 | |
ad706862 | 3135 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 3136 | if (unlikely(!rt)) { |
1da177e4 | 3137 | in6_dev_put(idev); |
87a11578 | 3138 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
3139 | goto out; |
3140 | } | |
3141 | ||
588753f1 | 3142 | rt->dst.input = ip6_input; |
8e2ec639 | 3143 | rt->dst.output = ip6_output; |
550bab42 | 3144 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 3145 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
3146 | rt->rt6i_dst.plen = 128; |
3147 | rt->rt6i_idev = idev; | |
14edd87d | 3148 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 3149 | |
4c981e28 | 3150 | /* Add this dst into uncached_list so that rt6_disable_ip() can |
587fea74 WW |
3151 | * do proper release of the net_device |
3152 | */ | |
3153 | rt6_uncached_list_add(rt); | |
81eb8447 | 3154 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1da177e4 | 3155 | |
87a11578 DM |
3156 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
3157 | ||
1da177e4 | 3158 | out: |
87a11578 | 3159 | return dst; |
1da177e4 LT |
3160 | } |
3161 | ||
569d3645 | 3162 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 3163 | { |
86393e52 | 3164 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
3165 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
3166 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
3167 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3168 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3169 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 3170 | int entries; |
7019b78e | 3171 | |
fc66f95c | 3172 | entries = dst_entries_get_fast(ops); |
49a18d86 | 3173 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 3174 | entries <= rt_max_size) |
1da177e4 LT |
3175 | goto out; |
3176 | ||
6891a346 | 3177 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 3178 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
3179 | entries = dst_entries_get_slow(ops); |
3180 | if (entries < ops->gc_thresh) | |
7019b78e | 3181 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 3182 | out: |
7019b78e | 3183 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 3184 | return entries > rt_max_size; |
1da177e4 LT |
3185 | } |
3186 | ||
b2c709cc DA |
3187 | static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg, |
3188 | const struct in6_addr *gw_addr, u32 tbid, | |
3189 | int flags, struct fib6_result *res) | |
8c14586f DA |
3190 | { |
3191 | struct flowi6 fl6 = { | |
3192 | .flowi6_oif = cfg->fc_ifindex, | |
3193 | .daddr = *gw_addr, | |
3194 | .saddr = cfg->fc_prefsrc, | |
3195 | }; | |
3196 | struct fib6_table *table; | |
b2c709cc | 3197 | int err; |
8c14586f | 3198 | |
f4797b33 | 3199 | table = fib6_get_table(net, tbid); |
8c14586f | 3200 | if (!table) |
b2c709cc | 3201 | return -EINVAL; |
8c14586f DA |
3202 | |
3203 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
3204 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3205 | ||
f4797b33 | 3206 | flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f | 3207 | |
b2c709cc DA |
3208 | err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags); |
3209 | if (!err && res->f6i != net->ipv6.fib6_null_entry) | |
3210 | fib6_select_path(net, res, &fl6, cfg->fc_ifindex, | |
3211 | cfg->fc_ifindex != 0, NULL, flags); | |
8c14586f | 3212 | |
b2c709cc | 3213 | return err; |
8c14586f DA |
3214 | } |
3215 | ||
fc1e64e1 DA |
3216 | static int ip6_route_check_nh_onlink(struct net *net, |
3217 | struct fib6_config *cfg, | |
9fbb704c | 3218 | const struct net_device *dev, |
fc1e64e1 DA |
3219 | struct netlink_ext_ack *extack) |
3220 | { | |
b2c709cc | 3221 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; |
fc1e64e1 | 3222 | const struct in6_addr *gw_addr = &cfg->fc_gateway; |
b2c709cc | 3223 | struct fib6_result res = {}; |
fc1e64e1 DA |
3224 | int err; |
3225 | ||
b2c709cc DA |
3226 | err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res); |
3227 | if (!err && !(res.fib6_flags & RTF_REJECT) && | |
3228 | /* ignore match if it is the default route */ | |
3229 | !ipv6_addr_any(&res.f6i->fib6_dst.addr) && | |
3230 | (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) { | |
3231 | NL_SET_ERR_MSG(extack, | |
3232 | "Nexthop has invalid gateway or device mismatch"); | |
3233 | err = -EINVAL; | |
fc1e64e1 DA |
3234 | } |
3235 | ||
3236 | return err; | |
3237 | } | |
3238 | ||
1edce99f DA |
3239 | static int ip6_route_check_nh(struct net *net, |
3240 | struct fib6_config *cfg, | |
3241 | struct net_device **_dev, | |
3242 | struct inet6_dev **idev) | |
3243 | { | |
3244 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3245 | struct net_device *dev = _dev ? *_dev : NULL; | |
b2c709cc DA |
3246 | int flags = RT6_LOOKUP_F_IFACE; |
3247 | struct fib6_result res = {}; | |
1edce99f DA |
3248 | int err = -EHOSTUNREACH; |
3249 | ||
3250 | if (cfg->fc_table) { | |
b2c709cc DA |
3251 | err = ip6_nh_lookup_table(net, cfg, gw_addr, |
3252 | cfg->fc_table, flags, &res); | |
3253 | /* gw_addr can not require a gateway or resolve to a reject | |
3254 | * route. If a device is given, it must match the result. | |
3255 | */ | |
3256 | if (err || res.fib6_flags & RTF_REJECT || | |
3257 | res.nh->fib_nh_gw_family || | |
3258 | (dev && dev != res.nh->fib_nh_dev)) | |
3259 | err = -EHOSTUNREACH; | |
1edce99f DA |
3260 | } |
3261 | ||
b2c709cc DA |
3262 | if (err < 0) { |
3263 | struct flowi6 fl6 = { | |
3264 | .flowi6_oif = cfg->fc_ifindex, | |
3265 | .daddr = *gw_addr, | |
3266 | }; | |
1edce99f | 3267 | |
b2c709cc DA |
3268 | err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags); |
3269 | if (err || res.fib6_flags & RTF_REJECT || | |
3270 | res.nh->fib_nh_gw_family) | |
3271 | err = -EHOSTUNREACH; | |
3272 | ||
3273 | if (err) | |
3274 | return err; | |
3275 | ||
3276 | fib6_select_path(net, &res, &fl6, cfg->fc_ifindex, | |
3277 | cfg->fc_ifindex != 0, NULL, flags); | |
3278 | } | |
1edce99f | 3279 | |
b2c709cc | 3280 | err = 0; |
1edce99f | 3281 | if (dev) { |
b2c709cc DA |
3282 | if (dev != res.nh->fib_nh_dev) |
3283 | err = -EHOSTUNREACH; | |
1edce99f | 3284 | } else { |
b2c709cc | 3285 | *_dev = dev = res.nh->fib_nh_dev; |
1edce99f | 3286 | dev_hold(dev); |
b2c709cc | 3287 | *idev = in6_dev_get(dev); |
1edce99f DA |
3288 | } |
3289 | ||
1edce99f DA |
3290 | return err; |
3291 | } | |
3292 | ||
9fbb704c DA |
3293 | static int ip6_validate_gw(struct net *net, struct fib6_config *cfg, |
3294 | struct net_device **_dev, struct inet6_dev **idev, | |
3295 | struct netlink_ext_ack *extack) | |
3296 | { | |
3297 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3298 | int gwa_type = ipv6_addr_type(gw_addr); | |
232378e8 | 3299 | bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true; |
9fbb704c | 3300 | const struct net_device *dev = *_dev; |
232378e8 | 3301 | bool need_addr_check = !dev; |
9fbb704c DA |
3302 | int err = -EINVAL; |
3303 | ||
3304 | /* if gw_addr is local we will fail to detect this in case | |
3305 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
3306 | * will return already-added prefix route via interface that | |
3307 | * prefix route was assigned to, which might be non-loopback. | |
3308 | */ | |
232378e8 DA |
3309 | if (dev && |
3310 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3311 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
9fbb704c DA |
3312 | goto out; |
3313 | } | |
3314 | ||
3315 | if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) { | |
3316 | /* IPv6 strictly inhibits using not link-local | |
3317 | * addresses as nexthop address. | |
3318 | * Otherwise, router will not able to send redirects. | |
3319 | * It is very good, but in some (rare!) circumstances | |
3320 | * (SIT, PtP, NBMA NOARP links) it is handy to allow | |
3321 | * some exceptions. --ANK | |
3322 | * We allow IPv4-mapped nexthops to support RFC4798-type | |
3323 | * addressing | |
3324 | */ | |
3325 | if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) { | |
3326 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
3327 | goto out; | |
3328 | } | |
3329 | ||
b2c709cc DA |
3330 | rcu_read_lock(); |
3331 | ||
9fbb704c DA |
3332 | if (cfg->fc_flags & RTNH_F_ONLINK) |
3333 | err = ip6_route_check_nh_onlink(net, cfg, dev, extack); | |
3334 | else | |
3335 | err = ip6_route_check_nh(net, cfg, _dev, idev); | |
3336 | ||
b2c709cc DA |
3337 | rcu_read_unlock(); |
3338 | ||
9fbb704c DA |
3339 | if (err) |
3340 | goto out; | |
3341 | } | |
3342 | ||
3343 | /* reload in case device was changed */ | |
3344 | dev = *_dev; | |
3345 | ||
3346 | err = -EINVAL; | |
3347 | if (!dev) { | |
3348 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
3349 | goto out; | |
3350 | } else if (dev->flags & IFF_LOOPBACK) { | |
3351 | NL_SET_ERR_MSG(extack, | |
3352 | "Egress device can not be loopback device for this route"); | |
3353 | goto out; | |
3354 | } | |
232378e8 DA |
3355 | |
3356 | /* if we did not check gw_addr above, do so now that the | |
3357 | * egress device has been resolved. | |
3358 | */ | |
3359 | if (need_addr_check && | |
3360 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3361 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
3362 | goto out; | |
3363 | } | |
3364 | ||
9fbb704c DA |
3365 | err = 0; |
3366 | out: | |
3367 | return err; | |
3368 | } | |
3369 | ||
83c44251 DA |
3370 | static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type) |
3371 | { | |
3372 | if ((flags & RTF_REJECT) || | |
3373 | (dev && (dev->flags & IFF_LOOPBACK) && | |
3374 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
3375 | !(flags & RTF_LOCAL))) | |
3376 | return true; | |
3377 | ||
3378 | return false; | |
3379 | } | |
3380 | ||
3381 | int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, | |
3382 | struct fib6_config *cfg, gfp_t gfp_flags, | |
3383 | struct netlink_ext_ack *extack) | |
3384 | { | |
3385 | struct net_device *dev = NULL; | |
3386 | struct inet6_dev *idev = NULL; | |
3387 | int addr_type; | |
3388 | int err; | |
3389 | ||
f1741730 | 3390 | fib6_nh->fib_nh_family = AF_INET6; |
1bef4c22 ED |
3391 | #ifdef CONFIG_IPV6_ROUTER_PREF |
3392 | fib6_nh->last_probe = jiffies; | |
3393 | #endif | |
f1741730 | 3394 | |
83c44251 DA |
3395 | err = -ENODEV; |
3396 | if (cfg->fc_ifindex) { | |
3397 | dev = dev_get_by_index(net, cfg->fc_ifindex); | |
3398 | if (!dev) | |
3399 | goto out; | |
3400 | idev = in6_dev_get(dev); | |
3401 | if (!idev) | |
3402 | goto out; | |
3403 | } | |
3404 | ||
3405 | if (cfg->fc_flags & RTNH_F_ONLINK) { | |
3406 | if (!dev) { | |
3407 | NL_SET_ERR_MSG(extack, | |
3408 | "Nexthop device required for onlink"); | |
3409 | goto out; | |
3410 | } | |
3411 | ||
3412 | if (!(dev->flags & IFF_UP)) { | |
3413 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3414 | err = -ENETDOWN; | |
3415 | goto out; | |
3416 | } | |
3417 | ||
ad1601ae | 3418 | fib6_nh->fib_nh_flags |= RTNH_F_ONLINK; |
83c44251 DA |
3419 | } |
3420 | ||
ad1601ae | 3421 | fib6_nh->fib_nh_weight = 1; |
83c44251 DA |
3422 | |
3423 | /* We cannot add true routes via loopback here, | |
3424 | * they would result in kernel looping; promote them to reject routes | |
3425 | */ | |
3426 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3427 | if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) { | |
3428 | /* hold loopback dev/idev if we haven't done so. */ | |
3429 | if (dev != net->loopback_dev) { | |
3430 | if (dev) { | |
3431 | dev_put(dev); | |
3432 | in6_dev_put(idev); | |
3433 | } | |
3434 | dev = net->loopback_dev; | |
3435 | dev_hold(dev); | |
3436 | idev = in6_dev_get(dev); | |
3437 | if (!idev) { | |
3438 | err = -ENODEV; | |
3439 | goto out; | |
3440 | } | |
3441 | } | |
7dd73168 | 3442 | goto pcpu_alloc; |
83c44251 DA |
3443 | } |
3444 | ||
3445 | if (cfg->fc_flags & RTF_GATEWAY) { | |
3446 | err = ip6_validate_gw(net, cfg, &dev, &idev, extack); | |
3447 | if (err) | |
3448 | goto out; | |
3449 | ||
ad1601ae | 3450 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; |
bdf00467 | 3451 | fib6_nh->fib_nh_gw_family = AF_INET6; |
83c44251 DA |
3452 | } |
3453 | ||
3454 | err = -ENODEV; | |
3455 | if (!dev) | |
3456 | goto out; | |
3457 | ||
3458 | if (idev->cnf.disable_ipv6) { | |
3459 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device"); | |
3460 | err = -EACCES; | |
3461 | goto out; | |
3462 | } | |
3463 | ||
3464 | if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) { | |
3465 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3466 | err = -ENETDOWN; | |
3467 | goto out; | |
3468 | } | |
3469 | ||
3470 | if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) && | |
3471 | !netif_carrier_ok(dev)) | |
ad1601ae | 3472 | fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
83c44251 | 3473 | |
faee6769 | 3474 | err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap, |
7dd73168 DA |
3475 | cfg->fc_encap_type, cfg, gfp_flags, extack); |
3476 | if (err) | |
3477 | goto out; | |
3478 | ||
3479 | pcpu_alloc: | |
f40b6ae2 DA |
3480 | fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags); |
3481 | if (!fib6_nh->rt6i_pcpu) { | |
3482 | err = -ENOMEM; | |
3483 | goto out; | |
3484 | } | |
3485 | ||
ad1601ae | 3486 | fib6_nh->fib_nh_dev = dev; |
f1741730 | 3487 | fib6_nh->fib_nh_oif = dev->ifindex; |
83c44251 DA |
3488 | err = 0; |
3489 | out: | |
3490 | if (idev) | |
3491 | in6_dev_put(idev); | |
3492 | ||
3493 | if (err) { | |
ad1601ae DA |
3494 | lwtstate_put(fib6_nh->fib_nh_lws); |
3495 | fib6_nh->fib_nh_lws = NULL; | |
83c44251 DA |
3496 | if (dev) |
3497 | dev_put(dev); | |
3498 | } | |
3499 | ||
3500 | return err; | |
3501 | } | |
3502 | ||
dac7d0f2 DA |
3503 | void fib6_nh_release(struct fib6_nh *fib6_nh) |
3504 | { | |
cc5c073a DA |
3505 | struct rt6_exception_bucket *bucket; |
3506 | ||
3507 | rcu_read_lock(); | |
3508 | ||
3509 | fib6_nh_flush_exceptions(fib6_nh, NULL); | |
3510 | bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL); | |
3511 | if (bucket) { | |
3512 | rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL); | |
3513 | kfree(bucket); | |
3514 | } | |
3515 | ||
3516 | rcu_read_unlock(); | |
3517 | ||
f40b6ae2 DA |
3518 | if (fib6_nh->rt6i_pcpu) { |
3519 | int cpu; | |
3520 | ||
3521 | for_each_possible_cpu(cpu) { | |
3522 | struct rt6_info **ppcpu_rt; | |
3523 | struct rt6_info *pcpu_rt; | |
3524 | ||
3525 | ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu); | |
3526 | pcpu_rt = *ppcpu_rt; | |
3527 | if (pcpu_rt) { | |
3528 | dst_dev_put(&pcpu_rt->dst); | |
3529 | dst_release(&pcpu_rt->dst); | |
3530 | *ppcpu_rt = NULL; | |
3531 | } | |
3532 | } | |
3533 | ||
3534 | free_percpu(fib6_nh->rt6i_pcpu); | |
3535 | } | |
3536 | ||
979e276e | 3537 | fib_nh_common_release(&fib6_nh->nh_common); |
dac7d0f2 DA |
3538 | } |
3539 | ||
8d1c802b | 3540 | static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, |
acb54e3c | 3541 | gfp_t gfp_flags, |
333c4301 | 3542 | struct netlink_ext_ack *extack) |
1da177e4 | 3543 | { |
5578689a | 3544 | struct net *net = cfg->fc_nlinfo.nl_net; |
8d1c802b | 3545 | struct fib6_info *rt = NULL; |
f88d8ea6 | 3546 | struct nexthop *nh = NULL; |
c71099ac | 3547 | struct fib6_table *table; |
f88d8ea6 | 3548 | struct fib6_nh *fib6_nh; |
8c5b83f0 | 3549 | int err = -EINVAL; |
83c44251 | 3550 | int addr_type; |
1da177e4 | 3551 | |
557c44be | 3552 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
3553 | if (cfg->fc_flags & RTF_PCPU) { |
3554 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 3555 | goto out; |
d5d531cb | 3556 | } |
557c44be | 3557 | |
2ea2352e WW |
3558 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
3559 | if (cfg->fc_flags & RTF_CACHE) { | |
3560 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
3561 | goto out; | |
3562 | } | |
3563 | ||
e8478e80 DA |
3564 | if (cfg->fc_type > RTN_MAX) { |
3565 | NL_SET_ERR_MSG(extack, "Invalid route type"); | |
3566 | goto out; | |
3567 | } | |
3568 | ||
d5d531cb DA |
3569 | if (cfg->fc_dst_len > 128) { |
3570 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
3571 | goto out; | |
3572 | } | |
3573 | if (cfg->fc_src_len > 128) { | |
3574 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 3575 | goto out; |
d5d531cb | 3576 | } |
1da177e4 | 3577 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
3578 | if (cfg->fc_src_len) { |
3579 | NL_SET_ERR_MSG(extack, | |
3580 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 3581 | goto out; |
d5d531cb | 3582 | } |
1da177e4 | 3583 | #endif |
5b98324e DA |
3584 | if (cfg->fc_nh_id) { |
3585 | nh = nexthop_find_by_id(net, cfg->fc_nh_id); | |
3586 | if (!nh) { | |
3587 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
3588 | goto out; | |
3589 | } | |
3590 | err = fib6_check_nexthop(nh, cfg, extack); | |
3591 | if (err) | |
3592 | goto out; | |
3593 | } | |
fc1e64e1 | 3594 | |
d71314b4 | 3595 | err = -ENOBUFS; |
38308473 DM |
3596 | if (cfg->fc_nlinfo.nlh && |
3597 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 3598 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 3599 | if (!table) { |
f3213831 | 3600 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
3601 | table = fib6_new_table(net, cfg->fc_table); |
3602 | } | |
3603 | } else { | |
3604 | table = fib6_new_table(net, cfg->fc_table); | |
3605 | } | |
38308473 DM |
3606 | |
3607 | if (!table) | |
c71099ac | 3608 | goto out; |
c71099ac | 3609 | |
93531c67 | 3610 | err = -ENOMEM; |
f88d8ea6 | 3611 | rt = fib6_info_alloc(gfp_flags, !nh); |
93531c67 | 3612 | if (!rt) |
1da177e4 | 3613 | goto out; |
93531c67 | 3614 | |
d7e774f3 DA |
3615 | rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len, |
3616 | extack); | |
767a2217 DA |
3617 | if (IS_ERR(rt->fib6_metrics)) { |
3618 | err = PTR_ERR(rt->fib6_metrics); | |
fda21d46 ED |
3619 | /* Do not leave garbage there. */ |
3620 | rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics; | |
767a2217 DA |
3621 | goto out; |
3622 | } | |
3623 | ||
93531c67 DA |
3624 | if (cfg->fc_flags & RTF_ADDRCONF) |
3625 | rt->dst_nocount = true; | |
1da177e4 | 3626 | |
1716a961 | 3627 | if (cfg->fc_flags & RTF_EXPIRES) |
14895687 | 3628 | fib6_set_expires(rt, jiffies + |
1716a961 G |
3629 | clock_t_to_jiffies(cfg->fc_expires)); |
3630 | else | |
14895687 | 3631 | fib6_clean_expires(rt); |
1da177e4 | 3632 | |
86872cb5 TG |
3633 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
3634 | cfg->fc_protocol = RTPROT_BOOT; | |
93c2fb25 | 3635 | rt->fib6_protocol = cfg->fc_protocol; |
86872cb5 | 3636 | |
83c44251 DA |
3637 | rt->fib6_table = table; |
3638 | rt->fib6_metric = cfg->fc_metric; | |
c7036d97 | 3639 | rt->fib6_type = cfg->fc_type ? : RTN_UNICAST; |
2b2450ca | 3640 | rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY; |
19e42e45 | 3641 | |
93c2fb25 DA |
3642 | ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
3643 | rt->fib6_dst.plen = cfg->fc_dst_len; | |
e5fd387a | 3644 | |
1da177e4 | 3645 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
3646 | ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len); |
3647 | rt->fib6_src.plen = cfg->fc_src_len; | |
1da177e4 | 3648 | #endif |
f88d8ea6 DA |
3649 | if (nh) { |
3650 | if (!nexthop_get(nh)) { | |
3651 | NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); | |
3652 | goto out; | |
3653 | } | |
3654 | if (rt->fib6_src.plen) { | |
4daa95af | 3655 | NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing"); |
f88d8ea6 DA |
3656 | goto out; |
3657 | } | |
3658 | rt->nh = nh; | |
3659 | fib6_nh = nexthop_fib6_nh(rt->nh); | |
3660 | } else { | |
3661 | err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack); | |
3662 | if (err) | |
3663 | goto out; | |
1da177e4 | 3664 | |
f88d8ea6 DA |
3665 | fib6_nh = rt->fib6_nh; |
3666 | ||
3667 | /* We cannot add true routes via loopback here, they would | |
3668 | * result in kernel looping; promote them to reject routes | |
3669 | */ | |
3670 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3671 | if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev, | |
3672 | addr_type)) | |
3673 | rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP; | |
3674 | } | |
955ec4cb | 3675 | |
c3968a85 | 3676 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
f88d8ea6 | 3677 | struct net_device *dev = fib6_nh->fib_nh_dev; |
83c44251 | 3678 | |
c3968a85 | 3679 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { |
d5d531cb | 3680 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
3681 | err = -EINVAL; |
3682 | goto out; | |
3683 | } | |
93c2fb25 DA |
3684 | rt->fib6_prefsrc.addr = cfg->fc_prefsrc; |
3685 | rt->fib6_prefsrc.plen = 128; | |
c3968a85 | 3686 | } else |
93c2fb25 | 3687 | rt->fib6_prefsrc.plen = 0; |
c3968a85 | 3688 | |
8c5b83f0 | 3689 | return rt; |
6b9ea5a6 | 3690 | out: |
93531c67 | 3691 | fib6_info_release(rt); |
8c5b83f0 | 3692 | return ERR_PTR(err); |
6b9ea5a6 RP |
3693 | } |
3694 | ||
acb54e3c | 3695 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
333c4301 | 3696 | struct netlink_ext_ack *extack) |
6b9ea5a6 | 3697 | { |
8d1c802b | 3698 | struct fib6_info *rt; |
6b9ea5a6 RP |
3699 | int err; |
3700 | ||
acb54e3c | 3701 | rt = ip6_route_info_create(cfg, gfp_flags, extack); |
d4ead6b3 DA |
3702 | if (IS_ERR(rt)) |
3703 | return PTR_ERR(rt); | |
6b9ea5a6 | 3704 | |
d4ead6b3 | 3705 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack); |
93531c67 | 3706 | fib6_info_release(rt); |
6b9ea5a6 | 3707 | |
1da177e4 LT |
3708 | return err; |
3709 | } | |
3710 | ||
8d1c802b | 3711 | static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info) |
1da177e4 | 3712 | { |
afb1d4b5 | 3713 | struct net *net = info->nl_net; |
c71099ac | 3714 | struct fib6_table *table; |
afb1d4b5 | 3715 | int err; |
1da177e4 | 3716 | |
421842ed | 3717 | if (rt == net->ipv6.fib6_null_entry) { |
6825a26c G |
3718 | err = -ENOENT; |
3719 | goto out; | |
3720 | } | |
6c813a72 | 3721 | |
93c2fb25 | 3722 | table = rt->fib6_table; |
66f5d6ce | 3723 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 3724 | err = fib6_del(rt, info); |
66f5d6ce | 3725 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 3726 | |
6825a26c | 3727 | out: |
93531c67 | 3728 | fib6_info_release(rt); |
1da177e4 LT |
3729 | return err; |
3730 | } | |
3731 | ||
8d1c802b | 3732 | int ip6_del_rt(struct net *net, struct fib6_info *rt) |
e0a1ad73 | 3733 | { |
afb1d4b5 DA |
3734 | struct nl_info info = { .nl_net = net }; |
3735 | ||
528c4ceb | 3736 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
3737 | } |
3738 | ||
8d1c802b | 3739 | static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg) |
0ae81335 DA |
3740 | { |
3741 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 3742 | struct net *net = info->nl_net; |
16a16cd3 | 3743 | struct sk_buff *skb = NULL; |
0ae81335 | 3744 | struct fib6_table *table; |
e3330039 | 3745 | int err = -ENOENT; |
0ae81335 | 3746 | |
421842ed | 3747 | if (rt == net->ipv6.fib6_null_entry) |
e3330039 | 3748 | goto out_put; |
93c2fb25 | 3749 | table = rt->fib6_table; |
66f5d6ce | 3750 | spin_lock_bh(&table->tb6_lock); |
0ae81335 | 3751 | |
93c2fb25 | 3752 | if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) { |
8d1c802b | 3753 | struct fib6_info *sibling, *next_sibling; |
0284696b | 3754 | struct fib6_node *fn; |
0ae81335 | 3755 | |
16a16cd3 DA |
3756 | /* prefer to send a single notification with all hops */ |
3757 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
3758 | if (skb) { | |
3759 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
3760 | ||
d4ead6b3 | 3761 | if (rt6_fill_node(net, skb, rt, NULL, |
16a16cd3 DA |
3762 | NULL, NULL, 0, RTM_DELROUTE, |
3763 | info->portid, seq, 0) < 0) { | |
3764 | kfree_skb(skb); | |
3765 | skb = NULL; | |
3766 | } else | |
3767 | info->skip_notify = 1; | |
3768 | } | |
3769 | ||
0284696b IS |
3770 | /* 'rt' points to the first sibling route. If it is not the |
3771 | * leaf, then we do not need to send a notification. Otherwise, | |
3772 | * we need to check if the last sibling has a next route or not | |
3773 | * and emit a replace or delete notification, respectively. | |
3774 | */ | |
2881fd61 | 3775 | info->skip_notify_kernel = 1; |
0284696b IS |
3776 | fn = rcu_dereference_protected(rt->fib6_node, |
3777 | lockdep_is_held(&table->tb6_lock)); | |
3778 | if (rcu_access_pointer(fn->leaf) == rt) { | |
3779 | struct fib6_info *last_sibling, *replace_rt; | |
3780 | ||
3781 | last_sibling = list_last_entry(&rt->fib6_siblings, | |
3782 | struct fib6_info, | |
3783 | fib6_siblings); | |
3784 | replace_rt = rcu_dereference_protected( | |
3785 | last_sibling->fib6_next, | |
3786 | lockdep_is_held(&table->tb6_lock)); | |
3787 | if (replace_rt) | |
3788 | call_fib6_entry_notifiers_replace(net, | |
3789 | replace_rt); | |
3790 | else | |
3791 | call_fib6_multipath_entry_notifiers(net, | |
caafb250 | 3792 | FIB_EVENT_ENTRY_DEL, |
0284696b IS |
3793 | rt, rt->fib6_nsiblings, |
3794 | NULL); | |
3795 | } | |
0ae81335 | 3796 | list_for_each_entry_safe(sibling, next_sibling, |
93c2fb25 DA |
3797 | &rt->fib6_siblings, |
3798 | fib6_siblings) { | |
0ae81335 DA |
3799 | err = fib6_del(sibling, info); |
3800 | if (err) | |
e3330039 | 3801 | goto out_unlock; |
0ae81335 DA |
3802 | } |
3803 | } | |
3804 | ||
3805 | err = fib6_del(rt, info); | |
e3330039 | 3806 | out_unlock: |
66f5d6ce | 3807 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 3808 | out_put: |
93531c67 | 3809 | fib6_info_release(rt); |
16a16cd3 DA |
3810 | |
3811 | if (skb) { | |
e3330039 | 3812 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
3813 | info->nlh, gfp_any()); |
3814 | } | |
0ae81335 DA |
3815 | return err; |
3816 | } | |
3817 | ||
0fa6efc5 | 3818 | static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg) |
23fb93a4 DA |
3819 | { |
3820 | int rc = -ESRCH; | |
3821 | ||
3822 | if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex) | |
3823 | goto out; | |
3824 | ||
3825 | if (cfg->fc_flags & RTF_GATEWAY && | |
3826 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
3827 | goto out; | |
761f6026 XL |
3828 | |
3829 | rc = rt6_remove_exception_rt(rt); | |
23fb93a4 DA |
3830 | out: |
3831 | return rc; | |
3832 | } | |
3833 | ||
0fa6efc5 DA |
3834 | static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt, |
3835 | struct fib6_nh *nh) | |
3836 | { | |
3837 | struct fib6_result res = { | |
3838 | .f6i = rt, | |
3839 | .nh = nh, | |
3840 | }; | |
3841 | struct rt6_info *rt_cache; | |
3842 | ||
3843 | rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src); | |
3844 | if (rt_cache) | |
3845 | return __ip6_del_cached_rt(rt_cache, cfg); | |
3846 | ||
3847 | return 0; | |
3848 | } | |
3849 | ||
5b98324e DA |
3850 | struct fib6_nh_del_cached_rt_arg { |
3851 | struct fib6_config *cfg; | |
3852 | struct fib6_info *f6i; | |
3853 | }; | |
3854 | ||
3855 | static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg) | |
3856 | { | |
3857 | struct fib6_nh_del_cached_rt_arg *arg = _arg; | |
3858 | int rc; | |
3859 | ||
3860 | rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh); | |
3861 | return rc != -ESRCH ? rc : 0; | |
3862 | } | |
3863 | ||
3864 | static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i) | |
3865 | { | |
3866 | struct fib6_nh_del_cached_rt_arg arg = { | |
3867 | .cfg = cfg, | |
3868 | .f6i = f6i | |
3869 | }; | |
3870 | ||
3871 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg); | |
3872 | } | |
3873 | ||
333c4301 DA |
3874 | static int ip6_route_del(struct fib6_config *cfg, |
3875 | struct netlink_ext_ack *extack) | |
1da177e4 | 3876 | { |
c71099ac | 3877 | struct fib6_table *table; |
8d1c802b | 3878 | struct fib6_info *rt; |
1da177e4 | 3879 | struct fib6_node *fn; |
1da177e4 LT |
3880 | int err = -ESRCH; |
3881 | ||
5578689a | 3882 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
3883 | if (!table) { |
3884 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 3885 | return err; |
d5d531cb | 3886 | } |
c71099ac | 3887 | |
66f5d6ce | 3888 | rcu_read_lock(); |
1da177e4 | 3889 | |
c71099ac | 3890 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 3891 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 3892 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 3893 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 3894 | |
1da177e4 | 3895 | if (fn) { |
66f5d6ce | 3896 | for_each_fib6_node_rt_rcu(fn) { |
ad1601ae DA |
3897 | struct fib6_nh *nh; |
3898 | ||
3401bfb1 SB |
3899 | if (rt->nh && cfg->fc_nh_id && |
3900 | rt->nh->id != cfg->fc_nh_id) | |
5b98324e | 3901 | continue; |
23fb93a4 | 3902 | |
5b98324e DA |
3903 | if (cfg->fc_flags & RTF_CACHE) { |
3904 | int rc = 0; | |
3905 | ||
3906 | if (rt->nh) { | |
3907 | rc = ip6_del_cached_rt_nh(cfg, rt); | |
3908 | } else if (cfg->fc_nh_id) { | |
3909 | continue; | |
3910 | } else { | |
3911 | nh = rt->fib6_nh; | |
3912 | rc = ip6_del_cached_rt(cfg, rt, nh); | |
3913 | } | |
0fa6efc5 DA |
3914 | if (rc != -ESRCH) { |
3915 | rcu_read_unlock(); | |
3916 | return rc; | |
23fb93a4 DA |
3917 | } |
3918 | continue; | |
2b760fcf | 3919 | } |
ad1601ae | 3920 | |
5b98324e DA |
3921 | if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric) |
3922 | continue; | |
3923 | if (cfg->fc_protocol && | |
3924 | cfg->fc_protocol != rt->fib6_protocol) | |
3925 | continue; | |
3926 | ||
3927 | if (rt->nh) { | |
3928 | if (!fib6_info_hold_safe(rt)) | |
3929 | continue; | |
3930 | rcu_read_unlock(); | |
3931 | ||
3932 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
3933 | } | |
3934 | if (cfg->fc_nh_id) | |
3935 | continue; | |
3936 | ||
3937 | nh = rt->fib6_nh; | |
86872cb5 | 3938 | if (cfg->fc_ifindex && |
ad1601ae DA |
3939 | (!nh->fib_nh_dev || |
3940 | nh->fib_nh_dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 3941 | continue; |
86872cb5 | 3942 | if (cfg->fc_flags & RTF_GATEWAY && |
ad1601ae | 3943 | !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6)) |
1da177e4 | 3944 | continue; |
e873e4b9 WW |
3945 | if (!fib6_info_hold_safe(rt)) |
3946 | continue; | |
66f5d6ce | 3947 | rcu_read_unlock(); |
1da177e4 | 3948 | |
0ae81335 DA |
3949 | /* if gateway was specified only delete the one hop */ |
3950 | if (cfg->fc_flags & RTF_GATEWAY) | |
3951 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
3952 | ||
3953 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
3954 | } |
3955 | } | |
66f5d6ce | 3956 | rcu_read_unlock(); |
1da177e4 LT |
3957 | |
3958 | return err; | |
3959 | } | |
3960 | ||
6700c270 | 3961 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 3962 | { |
a6279458 | 3963 | struct netevent_redirect netevent; |
e8599ff4 | 3964 | struct rt6_info *rt, *nrt = NULL; |
85bd05de | 3965 | struct fib6_result res = {}; |
e8599ff4 DM |
3966 | struct ndisc_options ndopts; |
3967 | struct inet6_dev *in6_dev; | |
3968 | struct neighbour *neigh; | |
71bcdba0 | 3969 | struct rd_msg *msg; |
6e157b6a DM |
3970 | int optlen, on_link; |
3971 | u8 *lladdr; | |
e8599ff4 | 3972 | |
29a3cad5 | 3973 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 3974 | optlen -= sizeof(*msg); |
e8599ff4 DM |
3975 | |
3976 | if (optlen < 0) { | |
6e157b6a | 3977 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
3978 | return; |
3979 | } | |
3980 | ||
71bcdba0 | 3981 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 3982 | |
71bcdba0 | 3983 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 3984 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
3985 | return; |
3986 | } | |
3987 | ||
6e157b6a | 3988 | on_link = 0; |
71bcdba0 | 3989 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 3990 | on_link = 1; |
71bcdba0 | 3991 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 3992 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 3993 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
3994 | return; |
3995 | } | |
3996 | ||
3997 | in6_dev = __in6_dev_get(skb->dev); | |
3998 | if (!in6_dev) | |
3999 | return; | |
4000 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
4001 | return; | |
4002 | ||
4003 | /* RFC2461 8.1: | |
4004 | * The IP source address of the Redirect MUST be the same as the current | |
4005 | * first-hop router for the specified ICMP Destination Address. | |
4006 | */ | |
4007 | ||
f997c55c | 4008 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
4009 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
4010 | return; | |
4011 | } | |
6e157b6a DM |
4012 | |
4013 | lladdr = NULL; | |
e8599ff4 DM |
4014 | if (ndopts.nd_opts_tgt_lladdr) { |
4015 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
4016 | skb->dev); | |
4017 | if (!lladdr) { | |
4018 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
4019 | return; | |
4020 | } | |
4021 | } | |
4022 | ||
6e157b6a | 4023 | rt = (struct rt6_info *) dst; |
ec13ad1d | 4024 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 4025 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 4026 | return; |
6e157b6a | 4027 | } |
e8599ff4 | 4028 | |
6e157b6a DM |
4029 | /* Redirect received -> path was valid. |
4030 | * Look, redirects are sent only in response to data packets, | |
4031 | * so that this nexthop apparently is reachable. --ANK | |
4032 | */ | |
0dec879f | 4033 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 4034 | |
71bcdba0 | 4035 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
4036 | if (!neigh) |
4037 | return; | |
a6279458 | 4038 | |
1da177e4 LT |
4039 | /* |
4040 | * We have finally decided to accept it. | |
4041 | */ | |
4042 | ||
f997c55c | 4043 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
4044 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
4045 | NEIGH_UPDATE_F_OVERRIDE| | |
4046 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
4047 | NEIGH_UPDATE_F_ISROUTER)), |
4048 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 4049 | |
4d85cd0c | 4050 | rcu_read_lock(); |
85bd05de | 4051 | res.f6i = rcu_dereference(rt->from); |
ff24e498 | 4052 | if (!res.f6i) |
886b7a50 | 4053 | goto out; |
8a14e46f | 4054 | |
49d5b8ef DA |
4055 | if (res.f6i->nh) { |
4056 | struct fib6_nh_match_arg arg = { | |
4057 | .dev = dst->dev, | |
4058 | .gw = &rt->rt6i_gateway, | |
4059 | }; | |
4060 | ||
4061 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
4062 | fib6_nh_find_match, &arg); | |
4063 | ||
4064 | /* fib6_info uses a nexthop that does not have fib6_nh | |
4065 | * using the dst->dev. Should be impossible | |
4066 | */ | |
4067 | if (!arg.match) | |
4068 | goto out; | |
4069 | res.nh = arg.match; | |
4070 | } else { | |
4071 | res.nh = res.f6i->fib6_nh; | |
4072 | } | |
4073 | ||
7d21fec9 DA |
4074 | res.fib6_flags = res.f6i->fib6_flags; |
4075 | res.fib6_type = res.f6i->fib6_type; | |
85bd05de | 4076 | nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL); |
38308473 | 4077 | if (!nrt) |
1da177e4 LT |
4078 | goto out; |
4079 | ||
4080 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
4081 | if (on_link) | |
4082 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
4083 | ||
4e3fd7a0 | 4084 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 4085 | |
886b7a50 | 4086 | /* rt6_insert_exception() will take care of duplicated exceptions */ |
5012f0a5 | 4087 | if (rt6_insert_exception(nrt, &res)) { |
2b760fcf WW |
4088 | dst_release_immediate(&nrt->dst); |
4089 | goto out; | |
4090 | } | |
1da177e4 | 4091 | |
d8d1f30b CG |
4092 | netevent.old = &rt->dst; |
4093 | netevent.new = &nrt->dst; | |
71bcdba0 | 4094 | netevent.daddr = &msg->dest; |
60592833 | 4095 | netevent.neigh = neigh; |
8d71740c TT |
4096 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
4097 | ||
1da177e4 | 4098 | out: |
886b7a50 | 4099 | rcu_read_unlock(); |
e8599ff4 | 4100 | neigh_release(neigh); |
6e157b6a DM |
4101 | } |
4102 | ||
70ceb4f5 | 4103 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 4104 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 4105 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4106 | const struct in6_addr *gwaddr, |
4107 | struct net_device *dev) | |
70ceb4f5 | 4108 | { |
830218c1 DA |
4109 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4110 | int ifindex = dev->ifindex; | |
70ceb4f5 | 4111 | struct fib6_node *fn; |
8d1c802b | 4112 | struct fib6_info *rt = NULL; |
c71099ac TG |
4113 | struct fib6_table *table; |
4114 | ||
830218c1 | 4115 | table = fib6_get_table(net, tb_id); |
38308473 | 4116 | if (!table) |
c71099ac | 4117 | return NULL; |
70ceb4f5 | 4118 | |
66f5d6ce | 4119 | rcu_read_lock(); |
38fbeeee | 4120 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
4121 | if (!fn) |
4122 | goto out; | |
4123 | ||
66f5d6ce | 4124 | for_each_fib6_node_rt_rcu(fn) { |
f88d8ea6 DA |
4125 | /* these routes do not use nexthops */ |
4126 | if (rt->nh) | |
4127 | continue; | |
1cf844c7 | 4128 | if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex) |
70ceb4f5 | 4129 | continue; |
2b2450ca | 4130 | if (!(rt->fib6_flags & RTF_ROUTEINFO) || |
1cf844c7 | 4131 | !rt->fib6_nh->fib_nh_gw_family) |
70ceb4f5 | 4132 | continue; |
1cf844c7 | 4133 | if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr)) |
70ceb4f5 | 4134 | continue; |
e873e4b9 WW |
4135 | if (!fib6_info_hold_safe(rt)) |
4136 | continue; | |
70ceb4f5 YH |
4137 | break; |
4138 | } | |
4139 | out: | |
66f5d6ce | 4140 | rcu_read_unlock(); |
70ceb4f5 YH |
4141 | return rt; |
4142 | } | |
4143 | ||
8d1c802b | 4144 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 4145 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4146 | const struct in6_addr *gwaddr, |
4147 | struct net_device *dev, | |
95c96174 | 4148 | unsigned int pref) |
70ceb4f5 | 4149 | { |
86872cb5 | 4150 | struct fib6_config cfg = { |
238fc7ea | 4151 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 4152 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
4153 | .fc_dst_len = prefixlen, |
4154 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
4155 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 4156 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4157 | .fc_type = RTN_UNICAST, |
15e47304 | 4158 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
4159 | .fc_nlinfo.nlh = NULL, |
4160 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
4161 | }; |
4162 | ||
830218c1 | 4163 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
4164 | cfg.fc_dst = *prefix; |
4165 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 4166 | |
e317da96 YH |
4167 | /* We should treat it as a default route if prefix length is 0. */ |
4168 | if (!prefixlen) | |
86872cb5 | 4169 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 4170 | |
acb54e3c | 4171 | ip6_route_add(&cfg, GFP_ATOMIC, NULL); |
70ceb4f5 | 4172 | |
830218c1 | 4173 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
4174 | } |
4175 | #endif | |
4176 | ||
8d1c802b | 4177 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 DA |
4178 | const struct in6_addr *addr, |
4179 | struct net_device *dev) | |
1ab1457c | 4180 | { |
830218c1 | 4181 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
8d1c802b | 4182 | struct fib6_info *rt; |
c71099ac | 4183 | struct fib6_table *table; |
1da177e4 | 4184 | |
afb1d4b5 | 4185 | table = fib6_get_table(net, tb_id); |
38308473 | 4186 | if (!table) |
c71099ac | 4187 | return NULL; |
1da177e4 | 4188 | |
66f5d6ce WW |
4189 | rcu_read_lock(); |
4190 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
f88d8ea6 | 4191 | struct fib6_nh *nh; |
ad1601ae | 4192 | |
f88d8ea6 DA |
4193 | /* RA routes do not use nexthops */ |
4194 | if (rt->nh) | |
4195 | continue; | |
4196 | ||
4197 | nh = rt->fib6_nh; | |
ad1601ae | 4198 | if (dev == nh->fib_nh_dev && |
93c2fb25 | 4199 | ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
ad1601ae | 4200 | ipv6_addr_equal(&nh->fib_nh_gw6, addr)) |
1da177e4 LT |
4201 | break; |
4202 | } | |
e873e4b9 WW |
4203 | if (rt && !fib6_info_hold_safe(rt)) |
4204 | rt = NULL; | |
66f5d6ce | 4205 | rcu_read_unlock(); |
1da177e4 LT |
4206 | return rt; |
4207 | } | |
4208 | ||
8d1c802b | 4209 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 4210 | const struct in6_addr *gwaddr, |
ebacaaa0 YH |
4211 | struct net_device *dev, |
4212 | unsigned int pref) | |
1da177e4 | 4213 | { |
86872cb5 | 4214 | struct fib6_config cfg = { |
ca254490 | 4215 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 4216 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
4217 | .fc_ifindex = dev->ifindex, |
4218 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
4219 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 4220 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4221 | .fc_type = RTN_UNICAST, |
15e47304 | 4222 | .fc_nlinfo.portid = 0, |
5578689a | 4223 | .fc_nlinfo.nlh = NULL, |
afb1d4b5 | 4224 | .fc_nlinfo.nl_net = net, |
86872cb5 | 4225 | }; |
1da177e4 | 4226 | |
4e3fd7a0 | 4227 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 4228 | |
acb54e3c | 4229 | if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) { |
830218c1 DA |
4230 | struct fib6_table *table; |
4231 | ||
4232 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
4233 | if (table) | |
4234 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
4235 | } | |
1da177e4 | 4236 | |
afb1d4b5 | 4237 | return rt6_get_dflt_router(net, gwaddr, dev); |
1da177e4 LT |
4238 | } |
4239 | ||
afb1d4b5 DA |
4240 | static void __rt6_purge_dflt_routers(struct net *net, |
4241 | struct fib6_table *table) | |
1da177e4 | 4242 | { |
8d1c802b | 4243 | struct fib6_info *rt; |
1da177e4 LT |
4244 | |
4245 | restart: | |
66f5d6ce WW |
4246 | rcu_read_lock(); |
4247 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
dcd1f572 DA |
4248 | struct net_device *dev = fib6_info_nh_dev(rt); |
4249 | struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL; | |
4250 | ||
93c2fb25 | 4251 | if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
e873e4b9 WW |
4252 | (!idev || idev->cnf.accept_ra != 2) && |
4253 | fib6_info_hold_safe(rt)) { | |
93531c67 DA |
4254 | rcu_read_unlock(); |
4255 | ip6_del_rt(net, rt); | |
1da177e4 LT |
4256 | goto restart; |
4257 | } | |
4258 | } | |
66f5d6ce | 4259 | rcu_read_unlock(); |
830218c1 DA |
4260 | |
4261 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
4262 | } | |
4263 | ||
4264 | void rt6_purge_dflt_routers(struct net *net) | |
4265 | { | |
4266 | struct fib6_table *table; | |
4267 | struct hlist_head *head; | |
4268 | unsigned int h; | |
4269 | ||
4270 | rcu_read_lock(); | |
4271 | ||
4272 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
4273 | head = &net->ipv6.fib_table_hash[h]; | |
4274 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
4275 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
afb1d4b5 | 4276 | __rt6_purge_dflt_routers(net, table); |
830218c1 DA |
4277 | } |
4278 | } | |
4279 | ||
4280 | rcu_read_unlock(); | |
1da177e4 LT |
4281 | } |
4282 | ||
5578689a DL |
4283 | static void rtmsg_to_fib6_config(struct net *net, |
4284 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
4285 | struct fib6_config *cfg) |
4286 | { | |
8823a3ac MŻ |
4287 | *cfg = (struct fib6_config){ |
4288 | .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? | |
4289 | : RT6_TABLE_MAIN, | |
4290 | .fc_ifindex = rtmsg->rtmsg_ifindex, | |
67f69513 | 4291 | .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER, |
8823a3ac MŻ |
4292 | .fc_expires = rtmsg->rtmsg_info, |
4293 | .fc_dst_len = rtmsg->rtmsg_dst_len, | |
4294 | .fc_src_len = rtmsg->rtmsg_src_len, | |
4295 | .fc_flags = rtmsg->rtmsg_flags, | |
4296 | .fc_type = rtmsg->rtmsg_type, | |
4297 | ||
4298 | .fc_nlinfo.nl_net = net, | |
4299 | ||
4300 | .fc_dst = rtmsg->rtmsg_dst, | |
4301 | .fc_src = rtmsg->rtmsg_src, | |
4302 | .fc_gateway = rtmsg->rtmsg_gateway, | |
4303 | }; | |
86872cb5 TG |
4304 | } |
4305 | ||
5578689a | 4306 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 4307 | { |
86872cb5 | 4308 | struct fib6_config cfg; |
1da177e4 LT |
4309 | struct in6_rtmsg rtmsg; |
4310 | int err; | |
4311 | ||
67ba4152 | 4312 | switch (cmd) { |
1da177e4 LT |
4313 | case SIOCADDRT: /* Add a route */ |
4314 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 4315 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
4316 | return -EPERM; |
4317 | err = copy_from_user(&rtmsg, arg, | |
4318 | sizeof(struct in6_rtmsg)); | |
4319 | if (err) | |
4320 | return -EFAULT; | |
86872cb5 | 4321 | |
5578689a | 4322 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 4323 | |
1da177e4 LT |
4324 | rtnl_lock(); |
4325 | switch (cmd) { | |
4326 | case SIOCADDRT: | |
acb54e3c | 4327 | err = ip6_route_add(&cfg, GFP_KERNEL, NULL); |
1da177e4 LT |
4328 | break; |
4329 | case SIOCDELRT: | |
333c4301 | 4330 | err = ip6_route_del(&cfg, NULL); |
1da177e4 LT |
4331 | break; |
4332 | default: | |
4333 | err = -EINVAL; | |
4334 | } | |
4335 | rtnl_unlock(); | |
4336 | ||
4337 | return err; | |
3ff50b79 | 4338 | } |
1da177e4 LT |
4339 | |
4340 | return -EINVAL; | |
4341 | } | |
4342 | ||
4343 | /* | |
4344 | * Drop the packet on the floor | |
4345 | */ | |
4346 | ||
d5fdd6ba | 4347 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 4348 | { |
adf30907 | 4349 | struct dst_entry *dst = skb_dst(skb); |
1d3fd8a1 SS |
4350 | struct net *net = dev_net(dst->dev); |
4351 | struct inet6_dev *idev; | |
4352 | int type; | |
4353 | ||
4354 | if (netif_is_l3_master(skb->dev) && | |
4355 | dst->dev == net->loopback_dev) | |
4356 | idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); | |
4357 | else | |
4358 | idev = ip6_dst_idev(dst); | |
4359 | ||
612f09e8 YH |
4360 | switch (ipstats_mib_noroutes) { |
4361 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 4362 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 4363 | if (type == IPV6_ADDR_ANY) { |
1d3fd8a1 | 4364 | IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
612f09e8 YH |
4365 | break; |
4366 | } | |
a8eceea8 | 4367 | fallthrough; |
612f09e8 | 4368 | case IPSTATS_MIB_OUTNOROUTES: |
1d3fd8a1 | 4369 | IP6_INC_STATS(net, idev, ipstats_mib_noroutes); |
612f09e8 YH |
4370 | break; |
4371 | } | |
1d3fd8a1 SS |
4372 | |
4373 | /* Start over by dropping the dst for l3mdev case */ | |
4374 | if (netif_is_l3_master(skb->dev)) | |
4375 | skb_dst_drop(skb); | |
4376 | ||
3ffe533c | 4377 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
4378 | kfree_skb(skb); |
4379 | return 0; | |
4380 | } | |
4381 | ||
9ce8ade0 TG |
4382 | static int ip6_pkt_discard(struct sk_buff *skb) |
4383 | { | |
612f09e8 | 4384 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4385 | } |
4386 | ||
ede2059d | 4387 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 4388 | { |
adf30907 | 4389 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4390 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
4391 | } |
4392 | ||
9ce8ade0 TG |
4393 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
4394 | { | |
612f09e8 | 4395 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4396 | } |
4397 | ||
ede2059d | 4398 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 4399 | { |
adf30907 | 4400 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4401 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
4402 | } |
4403 | ||
1da177e4 LT |
4404 | /* |
4405 | * Allocate a dst for local (unicast / anycast) address. | |
4406 | */ | |
4407 | ||
360a9887 DA |
4408 | struct fib6_info *addrconf_f6i_alloc(struct net *net, |
4409 | struct inet6_dev *idev, | |
4410 | const struct in6_addr *addr, | |
4411 | bool anycast, gfp_t gfp_flags) | |
1da177e4 | 4412 | { |
c7a1ce39 DA |
4413 | struct fib6_config cfg = { |
4414 | .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL, | |
4415 | .fc_ifindex = idev->dev->ifindex, | |
d55a2e37 | 4416 | .fc_flags = RTF_UP | RTF_NONEXTHOP, |
c7a1ce39 DA |
4417 | .fc_dst = *addr, |
4418 | .fc_dst_len = 128, | |
4419 | .fc_protocol = RTPROT_KERNEL, | |
4420 | .fc_nlinfo.nl_net = net, | |
4421 | .fc_ignore_dev_down = true, | |
4422 | }; | |
d55a2e37 | 4423 | struct fib6_info *f6i; |
1da177e4 | 4424 | |
e8478e80 | 4425 | if (anycast) { |
c7a1ce39 DA |
4426 | cfg.fc_type = RTN_ANYCAST; |
4427 | cfg.fc_flags |= RTF_ANYCAST; | |
e8478e80 | 4428 | } else { |
c7a1ce39 DA |
4429 | cfg.fc_type = RTN_LOCAL; |
4430 | cfg.fc_flags |= RTF_LOCAL; | |
e8478e80 | 4431 | } |
1da177e4 | 4432 | |
d55a2e37 | 4433 | f6i = ip6_route_info_create(&cfg, gfp_flags, NULL); |
8652f17c | 4434 | if (!IS_ERR(f6i)) |
d55a2e37 MŻ |
4435 | f6i->dst_nocount = true; |
4436 | return f6i; | |
1da177e4 LT |
4437 | } |
4438 | ||
c3968a85 DW |
4439 | /* remove deleted ip from prefsrc entries */ |
4440 | struct arg_dev_net_ip { | |
4441 | struct net_device *dev; | |
4442 | struct net *net; | |
4443 | struct in6_addr *addr; | |
4444 | }; | |
4445 | ||
8d1c802b | 4446 | static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg) |
c3968a85 DW |
4447 | { |
4448 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
4449 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
4450 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
4451 | ||
f88d8ea6 DA |
4452 | if (!rt->nh && |
4453 | ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) && | |
421842ed | 4454 | rt != net->ipv6.fib6_null_entry && |
93c2fb25 | 4455 | ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) { |
60006a48 | 4456 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 | 4457 | /* remove prefsrc entry */ |
93c2fb25 | 4458 | rt->fib6_prefsrc.plen = 0; |
60006a48 | 4459 | spin_unlock_bh(&rt6_exception_lock); |
c3968a85 DW |
4460 | } |
4461 | return 0; | |
4462 | } | |
4463 | ||
4464 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
4465 | { | |
4466 | struct net *net = dev_net(ifp->idev->dev); | |
4467 | struct arg_dev_net_ip adni = { | |
4468 | .dev = ifp->idev->dev, | |
4469 | .net = net, | |
4470 | .addr = &ifp->addr, | |
4471 | }; | |
0c3584d5 | 4472 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
4473 | } |
4474 | ||
2b2450ca | 4475 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT) |
be7a010d DJ |
4476 | |
4477 | /* Remove routers and update dst entries when gateway turn into host. */ | |
8d1c802b | 4478 | static int fib6_clean_tohost(struct fib6_info *rt, void *arg) |
be7a010d DJ |
4479 | { |
4480 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
f88d8ea6 DA |
4481 | struct fib6_nh *nh; |
4482 | ||
4483 | /* RA routes do not use nexthops */ | |
4484 | if (rt->nh) | |
4485 | return 0; | |
be7a010d | 4486 | |
f88d8ea6 | 4487 | nh = rt->fib6_nh; |
93c2fb25 | 4488 | if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
cc5c073a | 4489 | nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6)) |
be7a010d | 4490 | return -1; |
b16cb459 WW |
4491 | |
4492 | /* Further clean up cached routes in exception table. | |
4493 | * This is needed because cached route may have a different | |
4494 | * gateway than its 'parent' in the case of an ip redirect. | |
4495 | */ | |
cc5c073a | 4496 | fib6_nh_exceptions_clean_tohost(nh, gateway); |
b16cb459 | 4497 | |
be7a010d DJ |
4498 | return 0; |
4499 | } | |
4500 | ||
4501 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
4502 | { | |
4503 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
4504 | } | |
4505 | ||
2127d95a IS |
4506 | struct arg_netdev_event { |
4507 | const struct net_device *dev; | |
4c981e28 | 4508 | union { |
ecc5663c | 4509 | unsigned char nh_flags; |
4c981e28 IS |
4510 | unsigned long event; |
4511 | }; | |
2127d95a IS |
4512 | }; |
4513 | ||
8d1c802b | 4514 | static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt) |
d7dedee1 | 4515 | { |
8d1c802b | 4516 | struct fib6_info *iter; |
d7dedee1 IS |
4517 | struct fib6_node *fn; |
4518 | ||
93c2fb25 DA |
4519 | fn = rcu_dereference_protected(rt->fib6_node, |
4520 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
d7dedee1 | 4521 | iter = rcu_dereference_protected(fn->leaf, |
93c2fb25 | 4522 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 | 4523 | while (iter) { |
93c2fb25 | 4524 | if (iter->fib6_metric == rt->fib6_metric && |
33bd5ac5 | 4525 | rt6_qualify_for_ecmp(iter)) |
d7dedee1 | 4526 | return iter; |
8fb11a9a | 4527 | iter = rcu_dereference_protected(iter->fib6_next, |
93c2fb25 | 4528 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 IS |
4529 | } |
4530 | ||
4531 | return NULL; | |
4532 | } | |
4533 | ||
f88d8ea6 | 4534 | /* only called for fib entries with builtin fib6_nh */ |
8d1c802b | 4535 | static bool rt6_is_dead(const struct fib6_info *rt) |
d7dedee1 | 4536 | { |
1cf844c7 DA |
4537 | if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD || |
4538 | (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
4539 | ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev))) | |
d7dedee1 IS |
4540 | return true; |
4541 | ||
4542 | return false; | |
4543 | } | |
4544 | ||
8d1c802b | 4545 | static int rt6_multipath_total_weight(const struct fib6_info *rt) |
d7dedee1 | 4546 | { |
8d1c802b | 4547 | struct fib6_info *iter; |
d7dedee1 IS |
4548 | int total = 0; |
4549 | ||
4550 | if (!rt6_is_dead(rt)) | |
1cf844c7 | 4551 | total += rt->fib6_nh->fib_nh_weight; |
d7dedee1 | 4552 | |
93c2fb25 | 4553 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { |
d7dedee1 | 4554 | if (!rt6_is_dead(iter)) |
1cf844c7 | 4555 | total += iter->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4556 | } |
4557 | ||
4558 | return total; | |
4559 | } | |
4560 | ||
8d1c802b | 4561 | static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total) |
d7dedee1 IS |
4562 | { |
4563 | int upper_bound = -1; | |
4564 | ||
4565 | if (!rt6_is_dead(rt)) { | |
1cf844c7 | 4566 | *weight += rt->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4567 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31, |
4568 | total) - 1; | |
4569 | } | |
1cf844c7 | 4570 | atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound); |
d7dedee1 IS |
4571 | } |
4572 | ||
8d1c802b | 4573 | static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total) |
d7dedee1 | 4574 | { |
8d1c802b | 4575 | struct fib6_info *iter; |
d7dedee1 IS |
4576 | int weight = 0; |
4577 | ||
4578 | rt6_upper_bound_set(rt, &weight, total); | |
4579 | ||
93c2fb25 | 4580 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
d7dedee1 IS |
4581 | rt6_upper_bound_set(iter, &weight, total); |
4582 | } | |
4583 | ||
8d1c802b | 4584 | void rt6_multipath_rebalance(struct fib6_info *rt) |
d7dedee1 | 4585 | { |
8d1c802b | 4586 | struct fib6_info *first; |
d7dedee1 IS |
4587 | int total; |
4588 | ||
4589 | /* In case the entire multipath route was marked for flushing, | |
4590 | * then there is no need to rebalance upon the removal of every | |
4591 | * sibling route. | |
4592 | */ | |
93c2fb25 | 4593 | if (!rt->fib6_nsiblings || rt->should_flush) |
d7dedee1 IS |
4594 | return; |
4595 | ||
4596 | /* During lookup routes are evaluated in order, so we need to | |
4597 | * make sure upper bounds are assigned from the first sibling | |
4598 | * onwards. | |
4599 | */ | |
4600 | first = rt6_multipath_first_sibling(rt); | |
4601 | if (WARN_ON_ONCE(!first)) | |
4602 | return; | |
4603 | ||
4604 | total = rt6_multipath_total_weight(first); | |
4605 | rt6_multipath_upper_bound_set(first, total); | |
4606 | } | |
4607 | ||
8d1c802b | 4608 | static int fib6_ifup(struct fib6_info *rt, void *p_arg) |
2127d95a IS |
4609 | { |
4610 | const struct arg_netdev_event *arg = p_arg; | |
7aef6859 | 4611 | struct net *net = dev_net(arg->dev); |
2127d95a | 4612 | |
f88d8ea6 | 4613 | if (rt != net->ipv6.fib6_null_entry && !rt->nh && |
1cf844c7 DA |
4614 | rt->fib6_nh->fib_nh_dev == arg->dev) { |
4615 | rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags; | |
7aef6859 | 4616 | fib6_update_sernum_upto_root(net, rt); |
d7dedee1 | 4617 | rt6_multipath_rebalance(rt); |
1de178ed | 4618 | } |
2127d95a IS |
4619 | |
4620 | return 0; | |
4621 | } | |
4622 | ||
ecc5663c | 4623 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags) |
2127d95a IS |
4624 | { |
4625 | struct arg_netdev_event arg = { | |
4626 | .dev = dev, | |
6802f3ad IS |
4627 | { |
4628 | .nh_flags = nh_flags, | |
4629 | }, | |
2127d95a IS |
4630 | }; |
4631 | ||
4632 | if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev)) | |
4633 | arg.nh_flags |= RTNH_F_LINKDOWN; | |
4634 | ||
4635 | fib6_clean_all(dev_net(dev), fib6_ifup, &arg); | |
4636 | } | |
4637 | ||
f88d8ea6 | 4638 | /* only called for fib entries with inline fib6_nh */ |
8d1c802b | 4639 | static bool rt6_multipath_uses_dev(const struct fib6_info *rt, |
1de178ed IS |
4640 | const struct net_device *dev) |
4641 | { | |
8d1c802b | 4642 | struct fib6_info *iter; |
1de178ed | 4643 | |
1cf844c7 | 4644 | if (rt->fib6_nh->fib_nh_dev == dev) |
1de178ed | 4645 | return true; |
93c2fb25 | 4646 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 | 4647 | if (iter->fib6_nh->fib_nh_dev == dev) |
1de178ed IS |
4648 | return true; |
4649 | ||
4650 | return false; | |
4651 | } | |
4652 | ||
8d1c802b | 4653 | static void rt6_multipath_flush(struct fib6_info *rt) |
1de178ed | 4654 | { |
8d1c802b | 4655 | struct fib6_info *iter; |
1de178ed IS |
4656 | |
4657 | rt->should_flush = 1; | |
93c2fb25 | 4658 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1de178ed IS |
4659 | iter->should_flush = 1; |
4660 | } | |
4661 | ||
8d1c802b | 4662 | static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt, |
1de178ed IS |
4663 | const struct net_device *down_dev) |
4664 | { | |
8d1c802b | 4665 | struct fib6_info *iter; |
1de178ed IS |
4666 | unsigned int dead = 0; |
4667 | ||
1cf844c7 DA |
4668 | if (rt->fib6_nh->fib_nh_dev == down_dev || |
4669 | rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed | 4670 | dead++; |
93c2fb25 | 4671 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4672 | if (iter->fib6_nh->fib_nh_dev == down_dev || |
4673 | iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed IS |
4674 | dead++; |
4675 | ||
4676 | return dead; | |
4677 | } | |
4678 | ||
8d1c802b | 4679 | static void rt6_multipath_nh_flags_set(struct fib6_info *rt, |
1de178ed | 4680 | const struct net_device *dev, |
ecc5663c | 4681 | unsigned char nh_flags) |
1de178ed | 4682 | { |
8d1c802b | 4683 | struct fib6_info *iter; |
1de178ed | 4684 | |
1cf844c7 DA |
4685 | if (rt->fib6_nh->fib_nh_dev == dev) |
4686 | rt->fib6_nh->fib_nh_flags |= nh_flags; | |
93c2fb25 | 4687 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4688 | if (iter->fib6_nh->fib_nh_dev == dev) |
4689 | iter->fib6_nh->fib_nh_flags |= nh_flags; | |
1de178ed IS |
4690 | } |
4691 | ||
a1a22c12 | 4692 | /* called with write lock held for table with rt */ |
8d1c802b | 4693 | static int fib6_ifdown(struct fib6_info *rt, void *p_arg) |
1da177e4 | 4694 | { |
4c981e28 IS |
4695 | const struct arg_netdev_event *arg = p_arg; |
4696 | const struct net_device *dev = arg->dev; | |
7aef6859 | 4697 | struct net *net = dev_net(dev); |
8ed67789 | 4698 | |
f88d8ea6 | 4699 | if (rt == net->ipv6.fib6_null_entry || rt->nh) |
27c6fa73 IS |
4700 | return 0; |
4701 | ||
4702 | switch (arg->event) { | |
4703 | case NETDEV_UNREGISTER: | |
1cf844c7 | 4704 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
27c6fa73 | 4705 | case NETDEV_DOWN: |
1de178ed | 4706 | if (rt->should_flush) |
27c6fa73 | 4707 | return -1; |
93c2fb25 | 4708 | if (!rt->fib6_nsiblings) |
1cf844c7 | 4709 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
1de178ed IS |
4710 | if (rt6_multipath_uses_dev(rt, dev)) { |
4711 | unsigned int count; | |
4712 | ||
4713 | count = rt6_multipath_dead_count(rt, dev); | |
93c2fb25 | 4714 | if (rt->fib6_nsiblings + 1 == count) { |
1de178ed IS |
4715 | rt6_multipath_flush(rt); |
4716 | return -1; | |
4717 | } | |
4718 | rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD | | |
4719 | RTNH_F_LINKDOWN); | |
7aef6859 | 4720 | fib6_update_sernum(net, rt); |
d7dedee1 | 4721 | rt6_multipath_rebalance(rt); |
1de178ed IS |
4722 | } |
4723 | return -2; | |
27c6fa73 | 4724 | case NETDEV_CHANGE: |
1cf844c7 | 4725 | if (rt->fib6_nh->fib_nh_dev != dev || |
93c2fb25 | 4726 | rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) |
27c6fa73 | 4727 | break; |
1cf844c7 | 4728 | rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
d7dedee1 | 4729 | rt6_multipath_rebalance(rt); |
27c6fa73 | 4730 | break; |
2b241361 | 4731 | } |
c159d30c | 4732 | |
1da177e4 LT |
4733 | return 0; |
4734 | } | |
4735 | ||
27c6fa73 | 4736 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event) |
1da177e4 | 4737 | { |
4c981e28 | 4738 | struct arg_netdev_event arg = { |
8ed67789 | 4739 | .dev = dev, |
6802f3ad IS |
4740 | { |
4741 | .event = event, | |
4742 | }, | |
8ed67789 | 4743 | }; |
7c6bb7d2 | 4744 | struct net *net = dev_net(dev); |
8ed67789 | 4745 | |
7c6bb7d2 DA |
4746 | if (net->ipv6.sysctl.skip_notify_on_dev_down) |
4747 | fib6_clean_all_skip_notify(net, fib6_ifdown, &arg); | |
4748 | else | |
4749 | fib6_clean_all(net, fib6_ifdown, &arg); | |
4c981e28 IS |
4750 | } |
4751 | ||
4752 | void rt6_disable_ip(struct net_device *dev, unsigned long event) | |
4753 | { | |
4754 | rt6_sync_down_dev(dev, event); | |
4755 | rt6_uncached_list_flush_dev(dev_net(dev), dev); | |
4756 | neigh_ifdown(&nd_tbl, dev); | |
1da177e4 LT |
4757 | } |
4758 | ||
95c96174 | 4759 | struct rt6_mtu_change_arg { |
1da177e4 | 4760 | struct net_device *dev; |
95c96174 | 4761 | unsigned int mtu; |
c0b220cf | 4762 | struct fib6_info *f6i; |
1da177e4 LT |
4763 | }; |
4764 | ||
cc5c073a | 4765 | static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg) |
c0b220cf DA |
4766 | { |
4767 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg; | |
cc5c073a | 4768 | struct fib6_info *f6i = arg->f6i; |
c0b220cf DA |
4769 | |
4770 | /* For administrative MTU increase, there is no way to discover | |
4771 | * IPv6 PMTU increase, so PMTU increase should be updated here. | |
4772 | * Since RFC 1981 doesn't include administrative MTU increase | |
4773 | * update PMTU increase is a MUST. (i.e. jumbo frame) | |
4774 | */ | |
4775 | if (nh->fib_nh_dev == arg->dev) { | |
4776 | struct inet6_dev *idev = __in6_dev_get(arg->dev); | |
4777 | u32 mtu = f6i->fib6_pmtu; | |
4778 | ||
4779 | if (mtu >= arg->mtu || | |
4780 | (mtu < arg->mtu && mtu == idev->cnf.mtu6)) | |
4781 | fib6_metric_set(f6i, RTAX_MTU, arg->mtu); | |
4782 | ||
4783 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 4784 | rt6_exceptions_update_pmtu(idev, nh, arg->mtu); |
c0b220cf DA |
4785 | spin_unlock_bh(&rt6_exception_lock); |
4786 | } | |
4787 | ||
4788 | return 0; | |
4789 | } | |
4790 | ||
4791 | static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg) | |
1da177e4 LT |
4792 | { |
4793 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
4794 | struct inet6_dev *idev; | |
4795 | ||
4796 | /* In IPv6 pmtu discovery is not optional, | |
4797 | so that RTAX_MTU lock cannot disable it. | |
4798 | We still use this lock to block changes | |
4799 | caused by addrconf/ndisc. | |
4800 | */ | |
4801 | ||
4802 | idev = __in6_dev_get(arg->dev); | |
38308473 | 4803 | if (!idev) |
1da177e4 LT |
4804 | return 0; |
4805 | ||
c0b220cf DA |
4806 | if (fib6_metric_locked(f6i, RTAX_MTU)) |
4807 | return 0; | |
d4ead6b3 | 4808 | |
c0b220cf | 4809 | arg->f6i = f6i; |
2d44234b DA |
4810 | if (f6i->nh) { |
4811 | /* fib6_nh_mtu_change only returns 0, so this is safe */ | |
4812 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change, | |
4813 | arg); | |
4814 | } | |
4815 | ||
1cf844c7 | 4816 | return fib6_nh_mtu_change(f6i->fib6_nh, arg); |
1da177e4 LT |
4817 | } |
4818 | ||
95c96174 | 4819 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 4820 | { |
c71099ac TG |
4821 | struct rt6_mtu_change_arg arg = { |
4822 | .dev = dev, | |
4823 | .mtu = mtu, | |
4824 | }; | |
1da177e4 | 4825 | |
0c3584d5 | 4826 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
4827 | } |
4828 | ||
ef7c79ed | 4829 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
75425657 | 4830 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
5176f91e | 4831 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
aa8f8778 | 4832 | [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 4833 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 4834 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
4835 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
4836 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 4837 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 4838 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
4839 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
4840 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 4841 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 4842 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 4843 | [RTA_MARK] = { .type = NLA_U32 }, |
aa8f8778 | 4844 | [RTA_TABLE] = { .type = NLA_U32 }, |
eacb9384 RP |
4845 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
4846 | [RTA_SPORT] = { .type = NLA_U16 }, | |
4847 | [RTA_DPORT] = { .type = NLA_U16 }, | |
5b98324e | 4848 | [RTA_NH_ID] = { .type = NLA_U32 }, |
86872cb5 TG |
4849 | }; |
4850 | ||
4851 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
4852 | struct fib6_config *cfg, |
4853 | struct netlink_ext_ack *extack) | |
1da177e4 | 4854 | { |
86872cb5 TG |
4855 | struct rtmsg *rtm; |
4856 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 4857 | unsigned int pref; |
86872cb5 | 4858 | int err; |
1da177e4 | 4859 | |
8cb08174 JB |
4860 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
4861 | rtm_ipv6_policy, extack); | |
86872cb5 TG |
4862 | if (err < 0) |
4863 | goto errout; | |
1da177e4 | 4864 | |
86872cb5 TG |
4865 | err = -EINVAL; |
4866 | rtm = nlmsg_data(nlh); | |
86872cb5 | 4867 | |
84db8407 MŻ |
4868 | *cfg = (struct fib6_config){ |
4869 | .fc_table = rtm->rtm_table, | |
4870 | .fc_dst_len = rtm->rtm_dst_len, | |
4871 | .fc_src_len = rtm->rtm_src_len, | |
4872 | .fc_flags = RTF_UP, | |
4873 | .fc_protocol = rtm->rtm_protocol, | |
4874 | .fc_type = rtm->rtm_type, | |
4875 | ||
4876 | .fc_nlinfo.portid = NETLINK_CB(skb).portid, | |
4877 | .fc_nlinfo.nlh = nlh, | |
4878 | .fc_nlinfo.nl_net = sock_net(skb->sk), | |
4879 | }; | |
86872cb5 | 4880 | |
ef2c7d7b ND |
4881 | if (rtm->rtm_type == RTN_UNREACHABLE || |
4882 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
4883 | rtm->rtm_type == RTN_PROHIBIT || |
4884 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
4885 | cfg->fc_flags |= RTF_REJECT; |
4886 | ||
ab79ad14 MŻ |
4887 | if (rtm->rtm_type == RTN_LOCAL) |
4888 | cfg->fc_flags |= RTF_LOCAL; | |
4889 | ||
1f56a01f MKL |
4890 | if (rtm->rtm_flags & RTM_F_CLONED) |
4891 | cfg->fc_flags |= RTF_CACHE; | |
4892 | ||
fc1e64e1 DA |
4893 | cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK); |
4894 | ||
5b98324e DA |
4895 | if (tb[RTA_NH_ID]) { |
4896 | if (tb[RTA_GATEWAY] || tb[RTA_OIF] || | |
4897 | tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) { | |
4898 | NL_SET_ERR_MSG(extack, | |
4899 | "Nexthop specification and nexthop id are mutually exclusive"); | |
4900 | goto errout; | |
4901 | } | |
4902 | cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]); | |
4903 | } | |
4904 | ||
86872cb5 | 4905 | if (tb[RTA_GATEWAY]) { |
67b61f6c | 4906 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 4907 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 4908 | } |
e3818541 DA |
4909 | if (tb[RTA_VIA]) { |
4910 | NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute"); | |
4911 | goto errout; | |
4912 | } | |
86872cb5 TG |
4913 | |
4914 | if (tb[RTA_DST]) { | |
4915 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
4916 | ||
4917 | if (nla_len(tb[RTA_DST]) < plen) | |
4918 | goto errout; | |
4919 | ||
4920 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 4921 | } |
86872cb5 TG |
4922 | |
4923 | if (tb[RTA_SRC]) { | |
4924 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
4925 | ||
4926 | if (nla_len(tb[RTA_SRC]) < plen) | |
4927 | goto errout; | |
4928 | ||
4929 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 4930 | } |
86872cb5 | 4931 | |
c3968a85 | 4932 | if (tb[RTA_PREFSRC]) |
67b61f6c | 4933 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 4934 | |
86872cb5 TG |
4935 | if (tb[RTA_OIF]) |
4936 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
4937 | ||
4938 | if (tb[RTA_PRIORITY]) | |
4939 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
4940 | ||
4941 | if (tb[RTA_METRICS]) { | |
4942 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
4943 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 4944 | } |
86872cb5 TG |
4945 | |
4946 | if (tb[RTA_TABLE]) | |
4947 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
4948 | ||
51ebd318 ND |
4949 | if (tb[RTA_MULTIPATH]) { |
4950 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
4951 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
4952 | |
4953 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 4954 | cfg->fc_mp_len, extack); |
9ed59592 DA |
4955 | if (err < 0) |
4956 | goto errout; | |
51ebd318 ND |
4957 | } |
4958 | ||
c78ba6d6 LR |
4959 | if (tb[RTA_PREF]) { |
4960 | pref = nla_get_u8(tb[RTA_PREF]); | |
4961 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
4962 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
4963 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
4964 | cfg->fc_flags |= RTF_PREF(pref); | |
4965 | } | |
4966 | ||
19e42e45 RP |
4967 | if (tb[RTA_ENCAP]) |
4968 | cfg->fc_encap = tb[RTA_ENCAP]; | |
4969 | ||
9ed59592 | 4970 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
4971 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
4972 | ||
c255bd68 | 4973 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
4974 | if (err < 0) |
4975 | goto errout; | |
4976 | } | |
4977 | ||
32bc201e XL |
4978 | if (tb[RTA_EXPIRES]) { |
4979 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
4980 | ||
4981 | if (addrconf_finite_timeout(timeout)) { | |
4982 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
4983 | cfg->fc_flags |= RTF_EXPIRES; | |
4984 | } | |
4985 | } | |
4986 | ||
86872cb5 TG |
4987 | err = 0; |
4988 | errout: | |
4989 | return err; | |
1da177e4 LT |
4990 | } |
4991 | ||
6b9ea5a6 | 4992 | struct rt6_nh { |
8d1c802b | 4993 | struct fib6_info *fib6_info; |
6b9ea5a6 | 4994 | struct fib6_config r_cfg; |
6b9ea5a6 RP |
4995 | struct list_head next; |
4996 | }; | |
4997 | ||
d4ead6b3 DA |
4998 | static int ip6_route_info_append(struct net *net, |
4999 | struct list_head *rt6_nh_list, | |
8d1c802b DA |
5000 | struct fib6_info *rt, |
5001 | struct fib6_config *r_cfg) | |
6b9ea5a6 RP |
5002 | { |
5003 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
5004 | int err = -EEXIST; |
5005 | ||
5006 | list_for_each_entry(nh, rt6_nh_list, next) { | |
8d1c802b DA |
5007 | /* check if fib6_info already exists */ |
5008 | if (rt6_duplicate_nexthop(nh->fib6_info, rt)) | |
6b9ea5a6 RP |
5009 | return err; |
5010 | } | |
5011 | ||
5012 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
5013 | if (!nh) | |
5014 | return -ENOMEM; | |
8d1c802b | 5015 | nh->fib6_info = rt; |
6b9ea5a6 RP |
5016 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); |
5017 | list_add_tail(&nh->next, rt6_nh_list); | |
5018 | ||
5019 | return 0; | |
5020 | } | |
5021 | ||
8d1c802b DA |
5022 | static void ip6_route_mpath_notify(struct fib6_info *rt, |
5023 | struct fib6_info *rt_last, | |
3b1137fe DA |
5024 | struct nl_info *info, |
5025 | __u16 nlflags) | |
5026 | { | |
5027 | /* if this is an APPEND route, then rt points to the first route | |
5028 | * inserted and rt_last points to last route inserted. Userspace | |
5029 | * wants a consistent dump of the route which starts at the first | |
5030 | * nexthop. Since sibling routes are always added at the end of | |
5031 | * the list, find the first sibling of the last route appended | |
5032 | */ | |
93c2fb25 DA |
5033 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) { |
5034 | rt = list_first_entry(&rt_last->fib6_siblings, | |
8d1c802b | 5035 | struct fib6_info, |
93c2fb25 | 5036 | fib6_siblings); |
3b1137fe DA |
5037 | } |
5038 | ||
5039 | if (rt) | |
5040 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
5041 | } | |
5042 | ||
0ee0f47c IS |
5043 | static bool ip6_route_mpath_should_notify(const struct fib6_info *rt) |
5044 | { | |
5045 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); | |
5046 | bool should_notify = false; | |
5047 | struct fib6_info *leaf; | |
5048 | struct fib6_node *fn; | |
5049 | ||
5050 | rcu_read_lock(); | |
5051 | fn = rcu_dereference(rt->fib6_node); | |
5052 | if (!fn) | |
5053 | goto out; | |
5054 | ||
5055 | leaf = rcu_dereference(fn->leaf); | |
5056 | if (!leaf) | |
5057 | goto out; | |
5058 | ||
5059 | if (rt == leaf || | |
5060 | (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric && | |
5061 | rt6_qualify_for_ecmp(leaf))) | |
5062 | should_notify = true; | |
5063 | out: | |
5064 | rcu_read_unlock(); | |
5065 | ||
5066 | return should_notify; | |
5067 | } | |
5068 | ||
333c4301 DA |
5069 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
5070 | struct netlink_ext_ack *extack) | |
51ebd318 | 5071 | { |
8d1c802b | 5072 | struct fib6_info *rt_notif = NULL, *rt_last = NULL; |
3b1137fe | 5073 | struct nl_info *info = &cfg->fc_nlinfo; |
51ebd318 ND |
5074 | struct fib6_config r_cfg; |
5075 | struct rtnexthop *rtnh; | |
8d1c802b | 5076 | struct fib6_info *rt; |
6b9ea5a6 RP |
5077 | struct rt6_nh *err_nh; |
5078 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 5079 | __u16 nlflags; |
51ebd318 ND |
5080 | int remaining; |
5081 | int attrlen; | |
6b9ea5a6 RP |
5082 | int err = 1; |
5083 | int nhn = 0; | |
5084 | int replace = (cfg->fc_nlinfo.nlh && | |
5085 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
5086 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 5087 | |
3b1137fe DA |
5088 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
5089 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
5090 | nlflags |= NLM_F_APPEND; | |
5091 | ||
35f1b4e9 | 5092 | remaining = cfg->fc_mp_len; |
51ebd318 | 5093 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 5094 | |
6b9ea5a6 | 5095 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
8d1c802b | 5096 | * fib6_info structs per nexthop |
6b9ea5a6 | 5097 | */ |
51ebd318 ND |
5098 | while (rtnh_ok(rtnh, remaining)) { |
5099 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5100 | if (rtnh->rtnh_ifindex) | |
5101 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5102 | ||
5103 | attrlen = rtnh_attrlen(rtnh); | |
5104 | if (attrlen > 0) { | |
5105 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5106 | ||
5107 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5108 | if (nla) { | |
67b61f6c | 5109 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
5110 | r_cfg.fc_flags |= RTF_GATEWAY; |
5111 | } | |
19e42e45 RP |
5112 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
5113 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
5114 | if (nla) | |
5115 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 5116 | } |
6b9ea5a6 | 5117 | |
68e2ffde | 5118 | r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK); |
acb54e3c | 5119 | rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack); |
8c5b83f0 RP |
5120 | if (IS_ERR(rt)) { |
5121 | err = PTR_ERR(rt); | |
5122 | rt = NULL; | |
6b9ea5a6 | 5123 | goto cleanup; |
8c5b83f0 | 5124 | } |
b5d2d75e DA |
5125 | if (!rt6_qualify_for_ecmp(rt)) { |
5126 | err = -EINVAL; | |
5127 | NL_SET_ERR_MSG(extack, | |
5128 | "Device only routes can not be added for IPv6 using the multipath API."); | |
5129 | fib6_info_release(rt); | |
5130 | goto cleanup; | |
5131 | } | |
6b9ea5a6 | 5132 | |
1cf844c7 | 5133 | rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1; |
398958ae | 5134 | |
d4ead6b3 DA |
5135 | err = ip6_route_info_append(info->nl_net, &rt6_nh_list, |
5136 | rt, &r_cfg); | |
51ebd318 | 5137 | if (err) { |
93531c67 | 5138 | fib6_info_release(rt); |
6b9ea5a6 RP |
5139 | goto cleanup; |
5140 | } | |
5141 | ||
5142 | rtnh = rtnh_next(rtnh, &remaining); | |
5143 | } | |
5144 | ||
9eee3b49 IS |
5145 | if (list_empty(&rt6_nh_list)) { |
5146 | NL_SET_ERR_MSG(extack, | |
5147 | "Invalid nexthop configuration - no valid nexthops"); | |
5148 | return -EINVAL; | |
5149 | } | |
5150 | ||
3b1137fe DA |
5151 | /* for add and replace send one notification with all nexthops. |
5152 | * Skip the notification in fib6_add_rt2node and send one with | |
5153 | * the full route when done | |
5154 | */ | |
5155 | info->skip_notify = 1; | |
5156 | ||
ebee3cad IS |
5157 | /* For add and replace, send one notification with all nexthops. For |
5158 | * append, send one notification with all appended nexthops. | |
5159 | */ | |
5160 | info->skip_notify_kernel = 1; | |
5161 | ||
6b9ea5a6 RP |
5162 | err_nh = NULL; |
5163 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
8d1c802b DA |
5164 | err = __ip6_ins_rt(nh->fib6_info, info, extack); |
5165 | fib6_info_release(nh->fib6_info); | |
93531c67 | 5166 | |
f7225172 DA |
5167 | if (!err) { |
5168 | /* save reference to last route successfully inserted */ | |
5169 | rt_last = nh->fib6_info; | |
5170 | ||
5171 | /* save reference to first route for notification */ | |
5172 | if (!rt_notif) | |
5173 | rt_notif = nh->fib6_info; | |
5174 | } | |
3b1137fe | 5175 | |
8d1c802b DA |
5176 | /* nh->fib6_info is used or freed at this point, reset to NULL*/ |
5177 | nh->fib6_info = NULL; | |
6b9ea5a6 RP |
5178 | if (err) { |
5179 | if (replace && nhn) | |
a5a82d84 JK |
5180 | NL_SET_ERR_MSG_MOD(extack, |
5181 | "multipath route replace failed (check consistency of installed routes)"); | |
6b9ea5a6 RP |
5182 | err_nh = nh; |
5183 | goto add_errout; | |
51ebd318 | 5184 | } |
6b9ea5a6 | 5185 | |
1a72418b | 5186 | /* Because each route is added like a single route we remove |
27596472 MK |
5187 | * these flags after the first nexthop: if there is a collision, |
5188 | * we have already failed to add the first nexthop: | |
5189 | * fib6_add_rt2node() has rejected it; when replacing, old | |
5190 | * nexthops have been replaced by first new, the rest should | |
5191 | * be added to it. | |
1a72418b | 5192 | */ |
27596472 MK |
5193 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
5194 | NLM_F_REPLACE); | |
afecdb37 | 5195 | cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE; |
6b9ea5a6 RP |
5196 | nhn++; |
5197 | } | |
5198 | ||
0ee0f47c IS |
5199 | /* An in-kernel notification should only be sent in case the new |
5200 | * multipath route is added as the first route in the node, or if | |
5201 | * it was appended to it. We pass 'rt_notif' since it is the first | |
5202 | * sibling and might allow us to skip some checks in the replace case. | |
5203 | */ | |
5204 | if (ip6_route_mpath_should_notify(rt_notif)) { | |
5205 | enum fib_event_type fib_event; | |
5206 | ||
5207 | if (rt_notif->fib6_nsiblings != nhn - 1) | |
5208 | fib_event = FIB_EVENT_ENTRY_APPEND; | |
5209 | else | |
caafb250 | 5210 | fib_event = FIB_EVENT_ENTRY_REPLACE; |
0ee0f47c IS |
5211 | |
5212 | err = call_fib6_multipath_entry_notifiers(info->nl_net, | |
5213 | fib_event, rt_notif, | |
5214 | nhn - 1, extack); | |
5215 | if (err) { | |
5216 | /* Delete all the siblings that were just added */ | |
5217 | err_nh = NULL; | |
5218 | goto add_errout; | |
5219 | } | |
5220 | } | |
ebee3cad | 5221 | |
3b1137fe DA |
5222 | /* success ... tell user about new route */ |
5223 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
5224 | goto cleanup; |
5225 | ||
5226 | add_errout: | |
3b1137fe DA |
5227 | /* send notification for routes that were added so that |
5228 | * the delete notifications sent by ip6_route_del are | |
5229 | * coherent | |
5230 | */ | |
5231 | if (rt_notif) | |
5232 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
5233 | ||
6b9ea5a6 RP |
5234 | /* Delete routes that were already added */ |
5235 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
5236 | if (err_nh == nh) | |
5237 | break; | |
333c4301 | 5238 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
5239 | } |
5240 | ||
5241 | cleanup: | |
5242 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
8d1c802b DA |
5243 | if (nh->fib6_info) |
5244 | fib6_info_release(nh->fib6_info); | |
6b9ea5a6 RP |
5245 | list_del(&nh->next); |
5246 | kfree(nh); | |
5247 | } | |
5248 | ||
5249 | return err; | |
5250 | } | |
5251 | ||
333c4301 DA |
5252 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
5253 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
5254 | { |
5255 | struct fib6_config r_cfg; | |
5256 | struct rtnexthop *rtnh; | |
5257 | int remaining; | |
5258 | int attrlen; | |
5259 | int err = 1, last_err = 0; | |
5260 | ||
5261 | remaining = cfg->fc_mp_len; | |
5262 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
5263 | ||
5264 | /* Parse a Multipath Entry */ | |
5265 | while (rtnh_ok(rtnh, remaining)) { | |
5266 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5267 | if (rtnh->rtnh_ifindex) | |
5268 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5269 | ||
5270 | attrlen = rtnh_attrlen(rtnh); | |
5271 | if (attrlen > 0) { | |
5272 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5273 | ||
5274 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5275 | if (nla) { | |
5276 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
5277 | r_cfg.fc_flags |= RTF_GATEWAY; | |
5278 | } | |
5279 | } | |
333c4301 | 5280 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
5281 | if (err) |
5282 | last_err = err; | |
5283 | ||
51ebd318 ND |
5284 | rtnh = rtnh_next(rtnh, &remaining); |
5285 | } | |
5286 | ||
5287 | return last_err; | |
5288 | } | |
5289 | ||
c21ef3e3 DA |
5290 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5291 | struct netlink_ext_ack *extack) | |
1da177e4 | 5292 | { |
86872cb5 TG |
5293 | struct fib6_config cfg; |
5294 | int err; | |
1da177e4 | 5295 | |
333c4301 | 5296 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5297 | if (err < 0) |
5298 | return err; | |
5299 | ||
5b98324e DA |
5300 | if (cfg.fc_nh_id && |
5301 | !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) { | |
5302 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
5303 | return -EINVAL; | |
5304 | } | |
5305 | ||
51ebd318 | 5306 | if (cfg.fc_mp) |
333c4301 | 5307 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
5308 | else { |
5309 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 5310 | return ip6_route_del(&cfg, extack); |
0ae81335 | 5311 | } |
1da177e4 LT |
5312 | } |
5313 | ||
c21ef3e3 DA |
5314 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5315 | struct netlink_ext_ack *extack) | |
1da177e4 | 5316 | { |
86872cb5 TG |
5317 | struct fib6_config cfg; |
5318 | int err; | |
1da177e4 | 5319 | |
333c4301 | 5320 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5321 | if (err < 0) |
5322 | return err; | |
5323 | ||
67f69513 DA |
5324 | if (cfg.fc_metric == 0) |
5325 | cfg.fc_metric = IP6_RT_PRIO_USER; | |
5326 | ||
51ebd318 | 5327 | if (cfg.fc_mp) |
333c4301 | 5328 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 5329 | else |
acb54e3c | 5330 | return ip6_route_add(&cfg, GFP_KERNEL, extack); |
1da177e4 LT |
5331 | } |
5332 | ||
a1b7a1f0 DA |
5333 | /* add the overhead of this fib6_nh to nexthop_len */ |
5334 | static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg) | |
339bf98f | 5335 | { |
a1b7a1f0 | 5336 | int *nexthop_len = arg; |
beb1afac | 5337 | |
a1b7a1f0 DA |
5338 | *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */ |
5339 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5340 | + nla_total_size(16); /* RTA_GATEWAY */ | |
5341 | ||
5342 | if (nh->fib_nh_lws) { | |
5343 | /* RTA_ENCAP_TYPE */ | |
5344 | *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5345 | /* RTA_ENCAP */ | |
5346 | *nexthop_len += nla_total_size(2); | |
5347 | } | |
f88d8ea6 | 5348 | |
a1b7a1f0 DA |
5349 | return 0; |
5350 | } | |
beb1afac | 5351 | |
a1b7a1f0 DA |
5352 | static size_t rt6_nlmsg_size(struct fib6_info *f6i) |
5353 | { | |
5354 | int nexthop_len; | |
5355 | ||
5356 | if (f6i->nh) { | |
5357 | nexthop_len = nla_total_size(4); /* RTA_NH_ID */ | |
5358 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size, | |
5359 | &nexthop_len); | |
5360 | } else { | |
5361 | struct fib6_nh *nh = f6i->fib6_nh; | |
5362 | ||
5363 | nexthop_len = 0; | |
5364 | if (f6i->fib6_nsiblings) { | |
5365 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
5366 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5367 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5368 | + lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5369 | ||
5370 | nexthop_len *= f6i->fib6_nsiblings; | |
5371 | } | |
5372 | nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
beb1afac DA |
5373 | } |
5374 | ||
339bf98f TG |
5375 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
5376 | + nla_total_size(16) /* RTA_SRC */ | |
5377 | + nla_total_size(16) /* RTA_DST */ | |
5378 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5379 | + nla_total_size(16) /* RTA_PREFSRC */ | |
5380 | + nla_total_size(4) /* RTA_TABLE */ | |
5381 | + nla_total_size(4) /* RTA_IIF */ | |
5382 | + nla_total_size(4) /* RTA_OIF */ | |
5383 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 5384 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 5385 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 5386 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 5387 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
5388 | + nexthop_len; |
5389 | } | |
5390 | ||
f88d8ea6 DA |
5391 | static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh, |
5392 | unsigned char *flags) | |
5393 | { | |
5394 | if (nexthop_is_multipath(nh)) { | |
5395 | struct nlattr *mp; | |
5396 | ||
4255ff05 | 5397 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
f88d8ea6 DA |
5398 | if (!mp) |
5399 | goto nla_put_failure; | |
5400 | ||
7bdf4de1 | 5401 | if (nexthop_mpath_fill_node(skb, nh, AF_INET6)) |
f88d8ea6 DA |
5402 | goto nla_put_failure; |
5403 | ||
5404 | nla_nest_end(skb, mp); | |
5405 | } else { | |
5406 | struct fib6_nh *fib6_nh; | |
5407 | ||
5408 | fib6_nh = nexthop_fib6_nh(nh); | |
7bdf4de1 | 5409 | if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6, |
f88d8ea6 DA |
5410 | flags, false) < 0) |
5411 | goto nla_put_failure; | |
5412 | } | |
5413 | ||
5414 | return 0; | |
5415 | ||
5416 | nla_put_failure: | |
5417 | return -EMSGSIZE; | |
5418 | } | |
5419 | ||
d4ead6b3 | 5420 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 5421 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 5422 | struct in6_addr *dest, struct in6_addr *src, |
15e47304 | 5423 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 5424 | unsigned int flags) |
1da177e4 | 5425 | { |
22d0bd82 XL |
5426 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
5427 | struct rt6key *rt6_dst, *rt6_src; | |
5428 | u32 *pmetrics, table, rt6_flags; | |
f88d8ea6 | 5429 | unsigned char nh_flags = 0; |
2d7202bf | 5430 | struct nlmsghdr *nlh; |
22d0bd82 | 5431 | struct rtmsg *rtm; |
d4ead6b3 | 5432 | long expires = 0; |
1da177e4 | 5433 | |
15e47304 | 5434 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 5435 | if (!nlh) |
26932566 | 5436 | return -EMSGSIZE; |
2d7202bf | 5437 | |
22d0bd82 XL |
5438 | if (rt6) { |
5439 | rt6_dst = &rt6->rt6i_dst; | |
5440 | rt6_src = &rt6->rt6i_src; | |
5441 | rt6_flags = rt6->rt6i_flags; | |
5442 | } else { | |
5443 | rt6_dst = &rt->fib6_dst; | |
5444 | rt6_src = &rt->fib6_src; | |
5445 | rt6_flags = rt->fib6_flags; | |
5446 | } | |
5447 | ||
2d7202bf | 5448 | rtm = nlmsg_data(nlh); |
1da177e4 | 5449 | rtm->rtm_family = AF_INET6; |
22d0bd82 XL |
5450 | rtm->rtm_dst_len = rt6_dst->plen; |
5451 | rtm->rtm_src_len = rt6_src->plen; | |
1da177e4 | 5452 | rtm->rtm_tos = 0; |
93c2fb25 DA |
5453 | if (rt->fib6_table) |
5454 | table = rt->fib6_table->tb6_id; | |
c71099ac | 5455 | else |
9e762a4a | 5456 | table = RT6_TABLE_UNSPEC; |
97f0082a | 5457 | rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT; |
c78679e8 DM |
5458 | if (nla_put_u32(skb, RTA_TABLE, table)) |
5459 | goto nla_put_failure; | |
e8478e80 DA |
5460 | |
5461 | rtm->rtm_type = rt->fib6_type; | |
1da177e4 LT |
5462 | rtm->rtm_flags = 0; |
5463 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
93c2fb25 | 5464 | rtm->rtm_protocol = rt->fib6_protocol; |
1da177e4 | 5465 | |
22d0bd82 | 5466 | if (rt6_flags & RTF_CACHE) |
1da177e4 LT |
5467 | rtm->rtm_flags |= RTM_F_CLONED; |
5468 | ||
d4ead6b3 DA |
5469 | if (dest) { |
5470 | if (nla_put_in6_addr(skb, RTA_DST, dest)) | |
c78679e8 | 5471 | goto nla_put_failure; |
1ab1457c | 5472 | rtm->rtm_dst_len = 128; |
1da177e4 | 5473 | } else if (rtm->rtm_dst_len) |
22d0bd82 | 5474 | if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr)) |
c78679e8 | 5475 | goto nla_put_failure; |
1da177e4 LT |
5476 | #ifdef CONFIG_IPV6_SUBTREES |
5477 | if (src) { | |
930345ea | 5478 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 5479 | goto nla_put_failure; |
1ab1457c | 5480 | rtm->rtm_src_len = 128; |
c78679e8 | 5481 | } else if (rtm->rtm_src_len && |
22d0bd82 | 5482 | nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr)) |
c78679e8 | 5483 | goto nla_put_failure; |
1da177e4 | 5484 | #endif |
7bc570c8 YH |
5485 | if (iif) { |
5486 | #ifdef CONFIG_IPV6_MROUTE | |
22d0bd82 | 5487 | if (ipv6_addr_is_multicast(&rt6_dst->addr)) { |
fd61c6ba DA |
5488 | int err = ip6mr_get_route(net, skb, rtm, portid); |
5489 | ||
5490 | if (err == 0) | |
5491 | return 0; | |
5492 | if (err < 0) | |
5493 | goto nla_put_failure; | |
7bc570c8 YH |
5494 | } else |
5495 | #endif | |
c78679e8 DM |
5496 | if (nla_put_u32(skb, RTA_IIF, iif)) |
5497 | goto nla_put_failure; | |
d4ead6b3 | 5498 | } else if (dest) { |
1da177e4 | 5499 | struct in6_addr saddr_buf; |
d4ead6b3 | 5500 | if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 && |
930345ea | 5501 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5502 | goto nla_put_failure; |
1da177e4 | 5503 | } |
2d7202bf | 5504 | |
93c2fb25 | 5505 | if (rt->fib6_prefsrc.plen) { |
c3968a85 | 5506 | struct in6_addr saddr_buf; |
93c2fb25 | 5507 | saddr_buf = rt->fib6_prefsrc.addr; |
930345ea | 5508 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5509 | goto nla_put_failure; |
c3968a85 DW |
5510 | } |
5511 | ||
d4ead6b3 DA |
5512 | pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics; |
5513 | if (rtnetlink_put_metrics(skb, pmetrics) < 0) | |
2d7202bf TG |
5514 | goto nla_put_failure; |
5515 | ||
93c2fb25 | 5516 | if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric)) |
c78679e8 | 5517 | goto nla_put_failure; |
8253947e | 5518 | |
beb1afac DA |
5519 | /* For multipath routes, walk the siblings list and add |
5520 | * each as a nexthop within RTA_MULTIPATH. | |
5521 | */ | |
22d0bd82 XL |
5522 | if (rt6) { |
5523 | if (rt6_flags & RTF_GATEWAY && | |
5524 | nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway)) | |
5525 | goto nla_put_failure; | |
5526 | ||
5527 | if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex)) | |
5528 | goto nla_put_failure; | |
5529 | } else if (rt->fib6_nsiblings) { | |
8d1c802b | 5530 | struct fib6_info *sibling, *next_sibling; |
beb1afac DA |
5531 | struct nlattr *mp; |
5532 | ||
ae0be8de | 5533 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
beb1afac DA |
5534 | if (!mp) |
5535 | goto nla_put_failure; | |
5536 | ||
1cf844c7 | 5537 | if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common, |
7bdf4de1 | 5538 | rt->fib6_nh->fib_nh_weight, AF_INET6) < 0) |
beb1afac DA |
5539 | goto nla_put_failure; |
5540 | ||
5541 | list_for_each_entry_safe(sibling, next_sibling, | |
93c2fb25 | 5542 | &rt->fib6_siblings, fib6_siblings) { |
1cf844c7 | 5543 | if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common, |
7bdf4de1 DS |
5544 | sibling->fib6_nh->fib_nh_weight, |
5545 | AF_INET6) < 0) | |
beb1afac DA |
5546 | goto nla_put_failure; |
5547 | } | |
5548 | ||
5549 | nla_nest_end(skb, mp); | |
f88d8ea6 DA |
5550 | } else if (rt->nh) { |
5551 | if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id)) | |
5552 | goto nla_put_failure; | |
ecc5663c | 5553 | |
f88d8ea6 DA |
5554 | if (nexthop_is_blackhole(rt->nh)) |
5555 | rtm->rtm_type = RTN_BLACKHOLE; | |
5556 | ||
5557 | if (rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0) | |
5558 | goto nla_put_failure; | |
5559 | ||
5560 | rtm->rtm_flags |= nh_flags; | |
5561 | } else { | |
7bdf4de1 | 5562 | if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6, |
ecc5663c | 5563 | &nh_flags, false) < 0) |
beb1afac | 5564 | goto nla_put_failure; |
ecc5663c DA |
5565 | |
5566 | rtm->rtm_flags |= nh_flags; | |
beb1afac DA |
5567 | } |
5568 | ||
22d0bd82 | 5569 | if (rt6_flags & RTF_EXPIRES) { |
14895687 DA |
5570 | expires = dst ? dst->expires : rt->expires; |
5571 | expires -= jiffies; | |
5572 | } | |
69cdf8f9 | 5573 | |
bb3c4ab9 IS |
5574 | if (!dst) { |
5575 | if (rt->offload) | |
5576 | rtm->rtm_flags |= RTM_F_OFFLOAD; | |
5577 | if (rt->trap) | |
5578 | rtm->rtm_flags |= RTM_F_TRAP; | |
5579 | } | |
5580 | ||
d4ead6b3 | 5581 | if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0) |
e3703b3d | 5582 | goto nla_put_failure; |
2d7202bf | 5583 | |
22d0bd82 | 5584 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags))) |
c78ba6d6 LR |
5585 | goto nla_put_failure; |
5586 | ||
19e42e45 | 5587 | |
053c095a JB |
5588 | nlmsg_end(skb, nlh); |
5589 | return 0; | |
2d7202bf TG |
5590 | |
5591 | nla_put_failure: | |
26932566 PM |
5592 | nlmsg_cancel(skb, nlh); |
5593 | return -EMSGSIZE; | |
1da177e4 LT |
5594 | } |
5595 | ||
2c170e07 DA |
5596 | static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg) |
5597 | { | |
5598 | const struct net_device *dev = arg; | |
5599 | ||
5600 | if (nh->fib_nh_dev == dev) | |
5601 | return 1; | |
5602 | ||
5603 | return 0; | |
5604 | } | |
5605 | ||
13e38901 DA |
5606 | static bool fib6_info_uses_dev(const struct fib6_info *f6i, |
5607 | const struct net_device *dev) | |
5608 | { | |
2c170e07 DA |
5609 | if (f6i->nh) { |
5610 | struct net_device *_dev = (struct net_device *)dev; | |
5611 | ||
5612 | return !!nexthop_for_each_fib6_nh(f6i->nh, | |
5613 | fib6_info_nh_uses_dev, | |
5614 | _dev); | |
5615 | } | |
5616 | ||
1cf844c7 | 5617 | if (f6i->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5618 | return true; |
5619 | ||
5620 | if (f6i->fib6_nsiblings) { | |
5621 | struct fib6_info *sibling, *next_sibling; | |
5622 | ||
5623 | list_for_each_entry_safe(sibling, next_sibling, | |
5624 | &f6i->fib6_siblings, fib6_siblings) { | |
1cf844c7 | 5625 | if (sibling->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5626 | return true; |
5627 | } | |
5628 | } | |
5629 | ||
5630 | return false; | |
5631 | } | |
5632 | ||
1e47b483 SB |
5633 | struct fib6_nh_exception_dump_walker { |
5634 | struct rt6_rtnl_dump_arg *dump; | |
5635 | struct fib6_info *rt; | |
5636 | unsigned int flags; | |
5637 | unsigned int skip; | |
5638 | unsigned int count; | |
5639 | }; | |
5640 | ||
5641 | static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg) | |
5642 | { | |
5643 | struct fib6_nh_exception_dump_walker *w = arg; | |
5644 | struct rt6_rtnl_dump_arg *dump = w->dump; | |
5645 | struct rt6_exception_bucket *bucket; | |
5646 | struct rt6_exception *rt6_ex; | |
5647 | int i, err; | |
5648 | ||
5649 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); | |
5650 | if (!bucket) | |
5651 | return 0; | |
5652 | ||
5653 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
5654 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
5655 | if (w->skip) { | |
5656 | w->skip--; | |
5657 | continue; | |
5658 | } | |
5659 | ||
5660 | /* Expiration of entries doesn't bump sernum, insertion | |
5661 | * does. Removal is triggered by insertion, so we can | |
5662 | * rely on the fact that if entries change between two | |
5663 | * partial dumps, this node is scanned again completely, | |
5664 | * see rt6_insert_exception() and fib6_dump_table(). | |
5665 | * | |
5666 | * Count expired entries we go through as handled | |
5667 | * entries that we'll skip next time, in case of partial | |
5668 | * node dump. Otherwise, if entries expire meanwhile, | |
5669 | * we'll skip the wrong amount. | |
5670 | */ | |
5671 | if (rt6_check_expired(rt6_ex->rt6i)) { | |
5672 | w->count++; | |
5673 | continue; | |
5674 | } | |
5675 | ||
5676 | err = rt6_fill_node(dump->net, dump->skb, w->rt, | |
5677 | &rt6_ex->rt6i->dst, NULL, NULL, 0, | |
5678 | RTM_NEWROUTE, | |
5679 | NETLINK_CB(dump->cb->skb).portid, | |
5680 | dump->cb->nlh->nlmsg_seq, w->flags); | |
5681 | if (err) | |
5682 | return err; | |
5683 | ||
5684 | w->count++; | |
5685 | } | |
5686 | bucket++; | |
5687 | } | |
5688 | ||
5689 | return 0; | |
5690 | } | |
5691 | ||
bf9a8a06 | 5692 | /* Return -1 if done with node, number of handled routes on partial dump */ |
1e47b483 | 5693 | int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip) |
1da177e4 LT |
5694 | { |
5695 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
13e38901 DA |
5696 | struct fib_dump_filter *filter = &arg->filter; |
5697 | unsigned int flags = NLM_F_MULTI; | |
1f17e2f2 | 5698 | struct net *net = arg->net; |
1e47b483 | 5699 | int count = 0; |
1f17e2f2 | 5700 | |
421842ed | 5701 | if (rt == net->ipv6.fib6_null_entry) |
bf9a8a06 | 5702 | return -1; |
1da177e4 | 5703 | |
13e38901 DA |
5704 | if ((filter->flags & RTM_F_PREFIX) && |
5705 | !(rt->fib6_flags & RTF_PREFIX_RT)) { | |
5706 | /* success since this is not a prefix route */ | |
bf9a8a06 | 5707 | return -1; |
13e38901 | 5708 | } |
1e47b483 SB |
5709 | if (filter->filter_set && |
5710 | ((filter->rt_type && rt->fib6_type != filter->rt_type) || | |
5711 | (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) || | |
5712 | (filter->protocol && rt->fib6_protocol != filter->protocol))) { | |
5713 | return -1; | |
5714 | } | |
5715 | ||
5716 | if (filter->filter_set || | |
5717 | !filter->dump_routes || !filter->dump_exceptions) { | |
13e38901 | 5718 | flags |= NLM_F_DUMP_FILTERED; |
f8cfe2ce | 5719 | } |
1da177e4 | 5720 | |
1e47b483 SB |
5721 | if (filter->dump_routes) { |
5722 | if (skip) { | |
5723 | skip--; | |
5724 | } else { | |
5725 | if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, | |
5726 | 0, RTM_NEWROUTE, | |
5727 | NETLINK_CB(arg->cb->skb).portid, | |
5728 | arg->cb->nlh->nlmsg_seq, flags)) { | |
5729 | return 0; | |
5730 | } | |
5731 | count++; | |
5732 | } | |
5733 | } | |
5734 | ||
5735 | if (filter->dump_exceptions) { | |
5736 | struct fib6_nh_exception_dump_walker w = { .dump = arg, | |
5737 | .rt = rt, | |
5738 | .flags = flags, | |
5739 | .skip = skip, | |
5740 | .count = 0 }; | |
5741 | int err; | |
5742 | ||
3b525691 | 5743 | rcu_read_lock(); |
1e47b483 SB |
5744 | if (rt->nh) { |
5745 | err = nexthop_for_each_fib6_nh(rt->nh, | |
5746 | rt6_nh_dump_exceptions, | |
5747 | &w); | |
5748 | } else { | |
5749 | err = rt6_nh_dump_exceptions(rt->fib6_nh, &w); | |
5750 | } | |
3b525691 | 5751 | rcu_read_unlock(); |
1e47b483 SB |
5752 | |
5753 | if (err) | |
5754 | return count += w.count; | |
5755 | } | |
bf9a8a06 SB |
5756 | |
5757 | return -1; | |
1da177e4 LT |
5758 | } |
5759 | ||
0eff0a27 JK |
5760 | static int inet6_rtm_valid_getroute_req(struct sk_buff *skb, |
5761 | const struct nlmsghdr *nlh, | |
5762 | struct nlattr **tb, | |
5763 | struct netlink_ext_ack *extack) | |
5764 | { | |
5765 | struct rtmsg *rtm; | |
5766 | int i, err; | |
5767 | ||
5768 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
5769 | NL_SET_ERR_MSG_MOD(extack, | |
5770 | "Invalid header for get route request"); | |
5771 | return -EINVAL; | |
5772 | } | |
5773 | ||
5774 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
5775 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5776 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5777 | |
5778 | rtm = nlmsg_data(nlh); | |
5779 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || | |
5780 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || | |
5781 | rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope || | |
5782 | rtm->rtm_type) { | |
5783 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
5784 | return -EINVAL; | |
5785 | } | |
5786 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
5787 | NL_SET_ERR_MSG_MOD(extack, | |
5788 | "Invalid flags for get route request"); | |
5789 | return -EINVAL; | |
5790 | } | |
5791 | ||
8cb08174 JB |
5792 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
5793 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5794 | if (err) |
5795 | return err; | |
5796 | ||
5797 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
5798 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
5799 | NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); | |
5800 | return -EINVAL; | |
5801 | } | |
5802 | ||
5803 | for (i = 0; i <= RTA_MAX; i++) { | |
5804 | if (!tb[i]) | |
5805 | continue; | |
5806 | ||
5807 | switch (i) { | |
5808 | case RTA_SRC: | |
5809 | case RTA_DST: | |
5810 | case RTA_IIF: | |
5811 | case RTA_OIF: | |
5812 | case RTA_MARK: | |
5813 | case RTA_UID: | |
5814 | case RTA_SPORT: | |
5815 | case RTA_DPORT: | |
5816 | case RTA_IP_PROTO: | |
5817 | break; | |
5818 | default: | |
5819 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
5820 | return -EINVAL; | |
5821 | } | |
5822 | } | |
5823 | ||
5824 | return 0; | |
5825 | } | |
5826 | ||
c21ef3e3 DA |
5827 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
5828 | struct netlink_ext_ack *extack) | |
1da177e4 | 5829 | { |
3b1e0a65 | 5830 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 5831 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c | 5832 | int err, iif = 0, oif = 0; |
a68886a6 | 5833 | struct fib6_info *from; |
18c3a61c | 5834 | struct dst_entry *dst; |
ab364a6f | 5835 | struct rt6_info *rt; |
1da177e4 | 5836 | struct sk_buff *skb; |
ab364a6f | 5837 | struct rtmsg *rtm; |
744486d4 | 5838 | struct flowi6 fl6 = {}; |
18c3a61c | 5839 | bool fibmatch; |
1da177e4 | 5840 | |
0eff0a27 | 5841 | err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
ab364a6f TG |
5842 | if (err < 0) |
5843 | goto errout; | |
1da177e4 | 5844 | |
ab364a6f | 5845 | err = -EINVAL; |
38b7097b HFS |
5846 | rtm = nlmsg_data(nlh); |
5847 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 5848 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 5849 | |
ab364a6f TG |
5850 | if (tb[RTA_SRC]) { |
5851 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
5852 | goto errout; | |
5853 | ||
4e3fd7a0 | 5854 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
5855 | } |
5856 | ||
5857 | if (tb[RTA_DST]) { | |
5858 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
5859 | goto errout; | |
5860 | ||
4e3fd7a0 | 5861 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
5862 | } |
5863 | ||
5864 | if (tb[RTA_IIF]) | |
5865 | iif = nla_get_u32(tb[RTA_IIF]); | |
5866 | ||
5867 | if (tb[RTA_OIF]) | |
72331bc0 | 5868 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 5869 | |
2e47b291 LC |
5870 | if (tb[RTA_MARK]) |
5871 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
5872 | ||
622ec2c9 LC |
5873 | if (tb[RTA_UID]) |
5874 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
5875 | nla_get_u32(tb[RTA_UID])); | |
5876 | else | |
5877 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
5878 | ||
eacb9384 RP |
5879 | if (tb[RTA_SPORT]) |
5880 | fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]); | |
5881 | ||
5882 | if (tb[RTA_DPORT]) | |
5883 | fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]); | |
5884 | ||
5885 | if (tb[RTA_IP_PROTO]) { | |
5886 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea HL |
5887 | &fl6.flowi6_proto, AF_INET6, |
5888 | extack); | |
eacb9384 RP |
5889 | if (err) |
5890 | goto errout; | |
5891 | } | |
5892 | ||
1da177e4 LT |
5893 | if (iif) { |
5894 | struct net_device *dev; | |
72331bc0 SL |
5895 | int flags = 0; |
5896 | ||
121622db FW |
5897 | rcu_read_lock(); |
5898 | ||
5899 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 5900 | if (!dev) { |
121622db | 5901 | rcu_read_unlock(); |
1da177e4 | 5902 | err = -ENODEV; |
ab364a6f | 5903 | goto errout; |
1da177e4 | 5904 | } |
72331bc0 SL |
5905 | |
5906 | fl6.flowi6_iif = iif; | |
5907 | ||
5908 | if (!ipv6_addr_any(&fl6.saddr)) | |
5909 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
5910 | ||
b75cc8f9 | 5911 | dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags); |
121622db FW |
5912 | |
5913 | rcu_read_unlock(); | |
72331bc0 SL |
5914 | } else { |
5915 | fl6.flowi6_oif = oif; | |
5916 | ||
58acfd71 | 5917 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
5918 | } |
5919 | ||
18c3a61c RP |
5920 | |
5921 | rt = container_of(dst, struct rt6_info, dst); | |
5922 | if (rt->dst.error) { | |
5923 | err = rt->dst.error; | |
5924 | ip6_rt_put(rt); | |
5925 | goto errout; | |
1da177e4 LT |
5926 | } |
5927 | ||
9d6acb3b WC |
5928 | if (rt == net->ipv6.ip6_null_entry) { |
5929 | err = rt->dst.error; | |
5930 | ip6_rt_put(rt); | |
5931 | goto errout; | |
5932 | } | |
5933 | ||
ab364a6f | 5934 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 5935 | if (!skb) { |
94e187c0 | 5936 | ip6_rt_put(rt); |
ab364a6f TG |
5937 | err = -ENOBUFS; |
5938 | goto errout; | |
5939 | } | |
1da177e4 | 5940 | |
d8d1f30b | 5941 | skb_dst_set(skb, &rt->dst); |
a68886a6 DA |
5942 | |
5943 | rcu_read_lock(); | |
5944 | from = rcu_dereference(rt->from); | |
886b7a50 MKL |
5945 | if (from) { |
5946 | if (fibmatch) | |
5947 | err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, | |
5948 | iif, RTM_NEWROUTE, | |
5949 | NETLINK_CB(in_skb).portid, | |
5950 | nlh->nlmsg_seq, 0); | |
5951 | else | |
5952 | err = rt6_fill_node(net, skb, from, dst, &fl6.daddr, | |
5953 | &fl6.saddr, iif, RTM_NEWROUTE, | |
5954 | NETLINK_CB(in_skb).portid, | |
5955 | nlh->nlmsg_seq, 0); | |
5956 | } else { | |
5957 | err = -ENETUNREACH; | |
5958 | } | |
a68886a6 DA |
5959 | rcu_read_unlock(); |
5960 | ||
1da177e4 | 5961 | if (err < 0) { |
ab364a6f TG |
5962 | kfree_skb(skb); |
5963 | goto errout; | |
1da177e4 LT |
5964 | } |
5965 | ||
15e47304 | 5966 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 5967 | errout: |
1da177e4 | 5968 | return err; |
1da177e4 LT |
5969 | } |
5970 | ||
8d1c802b | 5971 | void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info, |
37a1d361 | 5972 | unsigned int nlm_flags) |
1da177e4 LT |
5973 | { |
5974 | struct sk_buff *skb; | |
5578689a | 5975 | struct net *net = info->nl_net; |
528c4ceb DL |
5976 | u32 seq; |
5977 | int err; | |
5978 | ||
5979 | err = -ENOBUFS; | |
38308473 | 5980 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 5981 | |
19e42e45 | 5982 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 5983 | if (!skb) |
21713ebc TG |
5984 | goto errout; |
5985 | ||
d4ead6b3 DA |
5986 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, |
5987 | event, info->portid, seq, nlm_flags); | |
26932566 PM |
5988 | if (err < 0) { |
5989 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
5990 | WARN_ON(err == -EMSGSIZE); | |
5991 | kfree_skb(skb); | |
5992 | goto errout; | |
5993 | } | |
15e47304 | 5994 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
5995 | info->nlh, gfp_any()); |
5996 | return; | |
21713ebc TG |
5997 | errout: |
5998 | if (err < 0) | |
5578689a | 5999 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
6000 | } |
6001 | ||
19a3b7ee DA |
6002 | void fib6_rt_update(struct net *net, struct fib6_info *rt, |
6003 | struct nl_info *info) | |
6004 | { | |
6005 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
6006 | struct sk_buff *skb; | |
6007 | int err = -ENOBUFS; | |
6008 | ||
6009 | /* call_fib6_entry_notifiers will be removed when in-kernel notifier | |
6010 | * is implemented and supported for nexthop objects | |
6011 | */ | |
6012 | call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, rt, NULL); | |
6013 | ||
6014 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
6015 | if (!skb) | |
6016 | goto errout; | |
6017 | ||
6018 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, | |
6019 | RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE); | |
6020 | if (err < 0) { | |
6021 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6022 | WARN_ON(err == -EMSGSIZE); | |
6023 | kfree_skb(skb); | |
6024 | goto errout; | |
6025 | } | |
6026 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, | |
6027 | info->nlh, gfp_any()); | |
6028 | return; | |
6029 | errout: | |
6030 | if (err < 0) | |
6031 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
6032 | } | |
6033 | ||
8ed67789 | 6034 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 6035 | unsigned long event, void *ptr) |
8ed67789 | 6036 | { |
351638e7 | 6037 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 6038 | struct net *net = dev_net(dev); |
8ed67789 | 6039 | |
242d3a49 WC |
6040 | if (!(dev->flags & IFF_LOOPBACK)) |
6041 | return NOTIFY_OK; | |
6042 | ||
6043 | if (event == NETDEV_REGISTER) { | |
1cf844c7 | 6044 | net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev; |
d8d1f30b | 6045 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
6046 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
6047 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 6048 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 6049 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 6050 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 6051 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 6052 | #endif |
76da0704 WC |
6053 | } else if (event == NETDEV_UNREGISTER && |
6054 | dev->reg_state != NETREG_UNREGISTERED) { | |
6055 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
6056 | * netdev_wait_allrefs(). Make sure we only call this once. | |
6057 | */ | |
12d94a80 | 6058 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 6059 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
6060 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
6061 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
6062 | #endif |
6063 | } | |
6064 | ||
6065 | return NOTIFY_OK; | |
6066 | } | |
6067 | ||
1da177e4 LT |
6068 | /* |
6069 | * /proc | |
6070 | */ | |
6071 | ||
6072 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
6073 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
6074 | { | |
69ddb805 | 6075 | struct net *net = (struct net *)seq->private; |
1da177e4 | 6076 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
6077 | net->ipv6.rt6_stats->fib_nodes, |
6078 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 6079 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
6080 | net->ipv6.rt6_stats->fib_rt_entries, |
6081 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 6082 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 6083 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
6084 | |
6085 | return 0; | |
6086 | } | |
1da177e4 LT |
6087 | #endif /* CONFIG_PROC_FS */ |
6088 | ||
6089 | #ifdef CONFIG_SYSCTL | |
6090 | ||
1da177e4 | 6091 | static |
fe2c6338 | 6092 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
6093 | void __user *buffer, size_t *lenp, loff_t *ppos) |
6094 | { | |
c486da34 LAG |
6095 | struct net *net; |
6096 | int delay; | |
f0fb9b28 | 6097 | int ret; |
c486da34 | 6098 | if (!write) |
1da177e4 | 6099 | return -EINVAL; |
c486da34 LAG |
6100 | |
6101 | net = (struct net *)ctl->extra1; | |
6102 | delay = net->ipv6.sysctl.flush_delay; | |
f0fb9b28 AP |
6103 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
6104 | if (ret) | |
6105 | return ret; | |
6106 | ||
2ac3ac8f | 6107 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 6108 | return 0; |
1da177e4 LT |
6109 | } |
6110 | ||
ed792e28 | 6111 | static struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 6112 | { |
1da177e4 | 6113 | .procname = "flush", |
4990509f | 6114 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 6115 | .maxlen = sizeof(int), |
89c8b3a1 | 6116 | .mode = 0200, |
6d9f239a | 6117 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
6118 | }, |
6119 | { | |
1da177e4 | 6120 | .procname = "gc_thresh", |
9a7ec3a9 | 6121 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
6122 | .maxlen = sizeof(int), |
6123 | .mode = 0644, | |
6d9f239a | 6124 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6125 | }, |
6126 | { | |
1da177e4 | 6127 | .procname = "max_size", |
4990509f | 6128 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
6129 | .maxlen = sizeof(int), |
6130 | .mode = 0644, | |
6d9f239a | 6131 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6132 | }, |
6133 | { | |
1da177e4 | 6134 | .procname = "gc_min_interval", |
4990509f | 6135 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6136 | .maxlen = sizeof(int), |
6137 | .mode = 0644, | |
6d9f239a | 6138 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6139 | }, |
6140 | { | |
1da177e4 | 6141 | .procname = "gc_timeout", |
4990509f | 6142 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
6143 | .maxlen = sizeof(int), |
6144 | .mode = 0644, | |
6d9f239a | 6145 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6146 | }, |
6147 | { | |
1da177e4 | 6148 | .procname = "gc_interval", |
4990509f | 6149 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
6150 | .maxlen = sizeof(int), |
6151 | .mode = 0644, | |
6d9f239a | 6152 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6153 | }, |
6154 | { | |
1da177e4 | 6155 | .procname = "gc_elasticity", |
4990509f | 6156 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
6157 | .maxlen = sizeof(int), |
6158 | .mode = 0644, | |
f3d3f616 | 6159 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6160 | }, |
6161 | { | |
1da177e4 | 6162 | .procname = "mtu_expires", |
4990509f | 6163 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
6164 | .maxlen = sizeof(int), |
6165 | .mode = 0644, | |
6d9f239a | 6166 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6167 | }, |
6168 | { | |
1da177e4 | 6169 | .procname = "min_adv_mss", |
4990509f | 6170 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
6171 | .maxlen = sizeof(int), |
6172 | .mode = 0644, | |
f3d3f616 | 6173 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6174 | }, |
6175 | { | |
1da177e4 | 6176 | .procname = "gc_min_interval_ms", |
4990509f | 6177 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6178 | .maxlen = sizeof(int), |
6179 | .mode = 0644, | |
6d9f239a | 6180 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 6181 | }, |
7c6bb7d2 DA |
6182 | { |
6183 | .procname = "skip_notify_on_dev_down", | |
6184 | .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down, | |
6185 | .maxlen = sizeof(int), | |
6186 | .mode = 0644, | |
b8e8a863 | 6187 | .proc_handler = proc_dointvec_minmax, |
eec4844f MC |
6188 | .extra1 = SYSCTL_ZERO, |
6189 | .extra2 = SYSCTL_ONE, | |
7c6bb7d2 | 6190 | }, |
f8572d8f | 6191 | { } |
1da177e4 LT |
6192 | }; |
6193 | ||
2c8c1e72 | 6194 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
6195 | { |
6196 | struct ctl_table *table; | |
6197 | ||
6198 | table = kmemdup(ipv6_route_table_template, | |
6199 | sizeof(ipv6_route_table_template), | |
6200 | GFP_KERNEL); | |
5ee09105 YH |
6201 | |
6202 | if (table) { | |
6203 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 6204 | table[0].extra1 = net; |
86393e52 | 6205 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
6206 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
6207 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
6208 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
6209 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
6210 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
6211 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
6212 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 6213 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
7c6bb7d2 | 6214 | table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down; |
464dc801 EB |
6215 | |
6216 | /* Don't export sysctls to unprivileged users */ | |
6217 | if (net->user_ns != &init_user_ns) | |
6218 | table[0].procname = NULL; | |
5ee09105 YH |
6219 | } |
6220 | ||
760f2d01 DL |
6221 | return table; |
6222 | } | |
1da177e4 LT |
6223 | #endif |
6224 | ||
2c8c1e72 | 6225 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 6226 | { |
633d424b | 6227 | int ret = -ENOMEM; |
8ed67789 | 6228 | |
86393e52 AD |
6229 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
6230 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 6231 | |
fc66f95c ED |
6232 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
6233 | goto out_ip6_dst_ops; | |
6234 | ||
1cf844c7 | 6235 | net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true); |
421842ed DA |
6236 | if (!net->ipv6.fib6_null_entry) |
6237 | goto out_ip6_dst_entries; | |
1cf844c7 DA |
6238 | memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template, |
6239 | sizeof(*net->ipv6.fib6_null_entry)); | |
421842ed | 6240 | |
8ed67789 DL |
6241 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
6242 | sizeof(*net->ipv6.ip6_null_entry), | |
6243 | GFP_KERNEL); | |
6244 | if (!net->ipv6.ip6_null_entry) | |
421842ed | 6245 | goto out_fib6_null_entry; |
d8d1f30b | 6246 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6247 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
6248 | ip6_template_metrics, true); | |
74109218 | 6249 | INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached); |
8ed67789 DL |
6250 | |
6251 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 6252 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
6253 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
6254 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
6255 | GFP_KERNEL); | |
68fffc67 PZ |
6256 | if (!net->ipv6.ip6_prohibit_entry) |
6257 | goto out_ip6_null_entry; | |
d8d1f30b | 6258 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6259 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
6260 | ip6_template_metrics, true); | |
74109218 | 6261 | INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached); |
8ed67789 DL |
6262 | |
6263 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
6264 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
6265 | GFP_KERNEL); | |
68fffc67 PZ |
6266 | if (!net->ipv6.ip6_blk_hole_entry) |
6267 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 6268 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6269 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
6270 | ip6_template_metrics, true); | |
74109218 | 6271 | INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached); |
b9b33e7c PA |
6272 | #ifdef CONFIG_IPV6_SUBTREES |
6273 | net->ipv6.fib6_routes_require_src = 0; | |
6274 | #endif | |
8ed67789 DL |
6275 | #endif |
6276 | ||
b339a47c PZ |
6277 | net->ipv6.sysctl.flush_delay = 0; |
6278 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
6279 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
6280 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
6281 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
6282 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
6283 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
6284 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
7c6bb7d2 | 6285 | net->ipv6.sysctl.skip_notify_on_dev_down = 0; |
b339a47c | 6286 | |
6891a346 BT |
6287 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
6288 | ||
8ed67789 DL |
6289 | ret = 0; |
6290 | out: | |
6291 | return ret; | |
f2fc6a54 | 6292 | |
68fffc67 PZ |
6293 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
6294 | out_ip6_prohibit_entry: | |
6295 | kfree(net->ipv6.ip6_prohibit_entry); | |
6296 | out_ip6_null_entry: | |
6297 | kfree(net->ipv6.ip6_null_entry); | |
6298 | #endif | |
421842ed DA |
6299 | out_fib6_null_entry: |
6300 | kfree(net->ipv6.fib6_null_entry); | |
fc66f95c ED |
6301 | out_ip6_dst_entries: |
6302 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 6303 | out_ip6_dst_ops: |
f2fc6a54 | 6304 | goto out; |
cdb18761 DL |
6305 | } |
6306 | ||
2c8c1e72 | 6307 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 6308 | { |
421842ed | 6309 | kfree(net->ipv6.fib6_null_entry); |
8ed67789 DL |
6310 | kfree(net->ipv6.ip6_null_entry); |
6311 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6312 | kfree(net->ipv6.ip6_prohibit_entry); | |
6313 | kfree(net->ipv6.ip6_blk_hole_entry); | |
6314 | #endif | |
41bb78b4 | 6315 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
6316 | } |
6317 | ||
d189634e TG |
6318 | static int __net_init ip6_route_net_init_late(struct net *net) |
6319 | { | |
6320 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
6321 | proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops, |
6322 | sizeof(struct ipv6_route_iter)); | |
3617d949 CH |
6323 | proc_create_net_single("rt6_stats", 0444, net->proc_net, |
6324 | rt6_stats_seq_show, NULL); | |
d189634e TG |
6325 | #endif |
6326 | return 0; | |
6327 | } | |
6328 | ||
6329 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
6330 | { | |
6331 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
6332 | remove_proc_entry("ipv6_route", net->proc_net); |
6333 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
6334 | #endif |
6335 | } | |
6336 | ||
cdb18761 DL |
6337 | static struct pernet_operations ip6_route_net_ops = { |
6338 | .init = ip6_route_net_init, | |
6339 | .exit = ip6_route_net_exit, | |
6340 | }; | |
6341 | ||
c3426b47 DM |
6342 | static int __net_init ipv6_inetpeer_init(struct net *net) |
6343 | { | |
6344 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
6345 | ||
6346 | if (!bp) | |
6347 | return -ENOMEM; | |
6348 | inet_peer_base_init(bp); | |
6349 | net->ipv6.peers = bp; | |
6350 | return 0; | |
6351 | } | |
6352 | ||
6353 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
6354 | { | |
6355 | struct inet_peer_base *bp = net->ipv6.peers; | |
6356 | ||
6357 | net->ipv6.peers = NULL; | |
56a6b248 | 6358 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
6359 | kfree(bp); |
6360 | } | |
6361 | ||
2b823f72 | 6362 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
6363 | .init = ipv6_inetpeer_init, |
6364 | .exit = ipv6_inetpeer_exit, | |
6365 | }; | |
6366 | ||
d189634e TG |
6367 | static struct pernet_operations ip6_route_net_late_ops = { |
6368 | .init = ip6_route_net_init_late, | |
6369 | .exit = ip6_route_net_exit_late, | |
6370 | }; | |
6371 | ||
8ed67789 DL |
6372 | static struct notifier_block ip6_route_dev_notifier = { |
6373 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 6374 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
6375 | }; |
6376 | ||
2f460933 WC |
6377 | void __init ip6_route_init_special_entries(void) |
6378 | { | |
6379 | /* Registering of the loopback is done before this portion of code, | |
6380 | * the loopback reference in rt6_info will not be taken, do it | |
6381 | * manually for init_net */ | |
1cf844c7 | 6382 | init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev; |
2f460933 WC |
6383 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
6384 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6385 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6386 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
6387 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6388 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
6389 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6390 | #endif | |
6391 | } | |
6392 | ||
433d49c3 | 6393 | int __init ip6_route_init(void) |
1da177e4 | 6394 | { |
433d49c3 | 6395 | int ret; |
8d0b94af | 6396 | int cpu; |
433d49c3 | 6397 | |
9a7ec3a9 DL |
6398 | ret = -ENOMEM; |
6399 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 6400 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 6401 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 6402 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 6403 | goto out; |
14e50e57 | 6404 | |
fc66f95c | 6405 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 6406 | if (ret) |
bdb3289f | 6407 | goto out_kmem_cache; |
bdb3289f | 6408 | |
c3426b47 DM |
6409 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
6410 | if (ret) | |
e8803b6c | 6411 | goto out_dst_entries; |
2a0c451a | 6412 | |
7e52b33b DM |
6413 | ret = register_pernet_subsys(&ip6_route_net_ops); |
6414 | if (ret) | |
6415 | goto out_register_inetpeer; | |
c3426b47 | 6416 | |
5dc121e9 AE |
6417 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
6418 | ||
e8803b6c | 6419 | ret = fib6_init(); |
433d49c3 | 6420 | if (ret) |
8ed67789 | 6421 | goto out_register_subsys; |
433d49c3 | 6422 | |
433d49c3 DL |
6423 | ret = xfrm6_init(); |
6424 | if (ret) | |
e8803b6c | 6425 | goto out_fib6_init; |
c35b7e72 | 6426 | |
433d49c3 DL |
6427 | ret = fib6_rules_init(); |
6428 | if (ret) | |
6429 | goto xfrm6_init; | |
7e5449c2 | 6430 | |
d189634e TG |
6431 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
6432 | if (ret) | |
6433 | goto fib6_rules_init; | |
6434 | ||
16feebcf FW |
6435 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE, |
6436 | inet6_rtm_newroute, NULL, 0); | |
6437 | if (ret < 0) | |
6438 | goto out_register_late_subsys; | |
6439 | ||
6440 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE, | |
6441 | inet6_rtm_delroute, NULL, 0); | |
6442 | if (ret < 0) | |
6443 | goto out_register_late_subsys; | |
6444 | ||
6445 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, | |
6446 | inet6_rtm_getroute, NULL, | |
6447 | RTNL_FLAG_DOIT_UNLOCKED); | |
6448 | if (ret < 0) | |
d189634e | 6449 | goto out_register_late_subsys; |
c127ea2c | 6450 | |
8ed67789 | 6451 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 6452 | if (ret) |
d189634e | 6453 | goto out_register_late_subsys; |
8ed67789 | 6454 | |
8d0b94af MKL |
6455 | for_each_possible_cpu(cpu) { |
6456 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
6457 | ||
6458 | INIT_LIST_HEAD(&ul->head); | |
6459 | spin_lock_init(&ul->lock); | |
6460 | } | |
6461 | ||
433d49c3 DL |
6462 | out: |
6463 | return ret; | |
6464 | ||
d189634e | 6465 | out_register_late_subsys: |
16feebcf | 6466 | rtnl_unregister_all(PF_INET6); |
d189634e | 6467 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
433d49c3 | 6468 | fib6_rules_init: |
433d49c3 DL |
6469 | fib6_rules_cleanup(); |
6470 | xfrm6_init: | |
433d49c3 | 6471 | xfrm6_fini(); |
2a0c451a TG |
6472 | out_fib6_init: |
6473 | fib6_gc_cleanup(); | |
8ed67789 DL |
6474 | out_register_subsys: |
6475 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
6476 | out_register_inetpeer: |
6477 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
6478 | out_dst_entries: |
6479 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 6480 | out_kmem_cache: |
f2fc6a54 | 6481 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 6482 | goto out; |
1da177e4 LT |
6483 | } |
6484 | ||
6485 | void ip6_route_cleanup(void) | |
6486 | { | |
8ed67789 | 6487 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 6488 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 6489 | fib6_rules_cleanup(); |
1da177e4 | 6490 | xfrm6_fini(); |
1da177e4 | 6491 | fib6_gc_cleanup(); |
c3426b47 | 6492 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 6493 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 6494 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 6495 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 6496 | } |