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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; | |
1065 | if (rt->dst_host) | |
1066 | flags |= DST_HOST; | |
1067 | ||
1068 | return flags; | |
1069 | } | |
1070 | ||
7d21fec9 | 1071 | static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type) |
6edb3c96 | 1072 | { |
7d21fec9 | 1073 | rt->dst.error = ip6_rt_type_to_error(fib6_type); |
6edb3c96 | 1074 | |
7d21fec9 | 1075 | switch (fib6_type) { |
6edb3c96 DA |
1076 | case RTN_BLACKHOLE: |
1077 | rt->dst.output = dst_discard_out; | |
1078 | rt->dst.input = dst_discard; | |
1079 | break; | |
1080 | case RTN_PROHIBIT: | |
1081 | rt->dst.output = ip6_pkt_prohibit_out; | |
1082 | rt->dst.input = ip6_pkt_prohibit; | |
1083 | break; | |
1084 | case RTN_THROW: | |
1085 | case RTN_UNREACHABLE: | |
1086 | default: | |
1087 | rt->dst.output = ip6_pkt_discard_out; | |
1088 | rt->dst.input = ip6_pkt_discard; | |
1089 | break; | |
1090 | } | |
1091 | } | |
1092 | ||
0d161581 | 1093 | static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res) |
6edb3c96 | 1094 | { |
7d21fec9 | 1095 | struct fib6_info *f6i = res->f6i; |
0d161581 | 1096 | |
7d21fec9 DA |
1097 | if (res->fib6_flags & RTF_REJECT) { |
1098 | ip6_rt_init_dst_reject(rt, res->fib6_type); | |
6edb3c96 DA |
1099 | return; |
1100 | } | |
1101 | ||
1102 | rt->dst.error = 0; | |
1103 | rt->dst.output = ip6_output; | |
1104 | ||
7d21fec9 | 1105 | if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) { |
6edb3c96 | 1106 | rt->dst.input = ip6_input; |
7d21fec9 | 1107 | } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) { |
6edb3c96 DA |
1108 | rt->dst.input = ip6_mc_input; |
1109 | } else { | |
1110 | rt->dst.input = ip6_forward; | |
1111 | } | |
1112 | ||
0d161581 DA |
1113 | if (res->nh->fib_nh_lws) { |
1114 | rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws); | |
6edb3c96 DA |
1115 | lwtunnel_set_redirect(&rt->dst); |
1116 | } | |
1117 | ||
1118 | rt->dst.lastuse = jiffies; | |
1119 | } | |
1120 | ||
e873e4b9 | 1121 | /* Caller must already hold reference to @from */ |
8d1c802b | 1122 | static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from) |
ae90d867 | 1123 | { |
ae90d867 | 1124 | rt->rt6i_flags &= ~RTF_EXPIRES; |
a68886a6 | 1125 | rcu_assign_pointer(rt->from, from); |
e1255ed4 | 1126 | ip_dst_init_metrics(&rt->dst, from->fib6_metrics); |
ae90d867 DA |
1127 | } |
1128 | ||
0d161581 DA |
1129 | /* Caller must already hold reference to f6i in result */ |
1130 | static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res) | |
ae90d867 | 1131 | { |
0d161581 DA |
1132 | const struct fib6_nh *nh = res->nh; |
1133 | const struct net_device *dev = nh->fib_nh_dev; | |
1134 | struct fib6_info *f6i = res->f6i; | |
dcd1f572 | 1135 | |
0d161581 | 1136 | ip6_rt_init_dst(rt, res); |
6edb3c96 | 1137 | |
0d161581 | 1138 | rt->rt6i_dst = f6i->fib6_dst; |
dcd1f572 | 1139 | rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL; |
7d21fec9 | 1140 | rt->rt6i_flags = res->fib6_flags; |
0d161581 DA |
1141 | if (nh->fib_nh_gw_family) { |
1142 | rt->rt6i_gateway = nh->fib_nh_gw6; | |
2b2450ca DA |
1143 | rt->rt6i_flags |= RTF_GATEWAY; |
1144 | } | |
0d161581 | 1145 | rt6_set_from(rt, f6i); |
ae90d867 | 1146 | #ifdef CONFIG_IPV6_SUBTREES |
0d161581 | 1147 | rt->rt6i_src = f6i->fib6_src; |
ae90d867 | 1148 | #endif |
ae90d867 DA |
1149 | } |
1150 | ||
a3c00e46 MKL |
1151 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
1152 | struct in6_addr *saddr) | |
1153 | { | |
66f5d6ce | 1154 | struct fib6_node *pn, *sn; |
a3c00e46 MKL |
1155 | while (1) { |
1156 | if (fn->fn_flags & RTN_TL_ROOT) | |
1157 | return NULL; | |
66f5d6ce WW |
1158 | pn = rcu_dereference(fn->parent); |
1159 | sn = FIB6_SUBTREE(pn); | |
1160 | if (sn && sn != fn) | |
6454743b | 1161 | fn = fib6_node_lookup(sn, NULL, saddr); |
a3c00e46 MKL |
1162 | else |
1163 | fn = pn; | |
1164 | if (fn->fn_flags & RTN_RTINFO) | |
1165 | return fn; | |
1166 | } | |
1167 | } | |
c71099ac | 1168 | |
10585b43 | 1169 | static bool ip6_hold_safe(struct net *net, struct rt6_info **prt) |
d3843fe5 WW |
1170 | { |
1171 | struct rt6_info *rt = *prt; | |
1172 | ||
1173 | if (dst_hold_safe(&rt->dst)) | |
1174 | return true; | |
10585b43 | 1175 | if (net) { |
d3843fe5 WW |
1176 | rt = net->ipv6.ip6_null_entry; |
1177 | dst_hold(&rt->dst); | |
1178 | } else { | |
1179 | rt = NULL; | |
1180 | } | |
1181 | *prt = rt; | |
1182 | return false; | |
1183 | } | |
1184 | ||
dec9b0e2 | 1185 | /* called with rcu_lock held */ |
9b6b35ab | 1186 | static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res) |
dec9b0e2 | 1187 | { |
9b6b35ab DA |
1188 | struct net_device *dev = res->nh->fib_nh_dev; |
1189 | struct fib6_info *f6i = res->f6i; | |
1190 | unsigned short flags; | |
dec9b0e2 DA |
1191 | struct rt6_info *nrt; |
1192 | ||
9b6b35ab | 1193 | if (!fib6_info_hold_safe(f6i)) |
1c87e79a | 1194 | goto fallback; |
e873e4b9 | 1195 | |
9b6b35ab | 1196 | flags = fib6_info_dst_flags(f6i); |
93531c67 | 1197 | nrt = ip6_dst_alloc(dev_net(dev), dev, flags); |
1c87e79a | 1198 | if (!nrt) { |
9b6b35ab | 1199 | fib6_info_release(f6i); |
1c87e79a XL |
1200 | goto fallback; |
1201 | } | |
dec9b0e2 | 1202 | |
0d161581 | 1203 | ip6_rt_copy_init(nrt, res); |
1c87e79a XL |
1204 | return nrt; |
1205 | ||
1206 | fallback: | |
1207 | nrt = dev_net(dev)->ipv6.ip6_null_entry; | |
1208 | dst_hold(&nrt->dst); | |
dec9b0e2 DA |
1209 | return nrt; |
1210 | } | |
1211 | ||
8ed67789 DL |
1212 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
1213 | struct fib6_table *table, | |
b75cc8f9 DA |
1214 | struct flowi6 *fl6, |
1215 | const struct sk_buff *skb, | |
1216 | int flags) | |
1da177e4 | 1217 | { |
b1d40991 | 1218 | struct fib6_result res = {}; |
1da177e4 | 1219 | struct fib6_node *fn; |
23fb93a4 | 1220 | struct rt6_info *rt; |
1da177e4 | 1221 | |
b6cdbc85 DA |
1222 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1223 | flags &= ~RT6_LOOKUP_F_IFACE; | |
1224 | ||
66f5d6ce | 1225 | rcu_read_lock(); |
6454743b | 1226 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac | 1227 | restart: |
b1d40991 DA |
1228 | res.f6i = rcu_dereference(fn->leaf); |
1229 | if (!res.f6i) | |
1230 | res.f6i = net->ipv6.fib6_null_entry; | |
af52a52c | 1231 | else |
75ef7389 DA |
1232 | rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif, |
1233 | flags); | |
af52a52c | 1234 | |
b1d40991 | 1235 | if (res.f6i == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
1236 | fn = fib6_backtrack(fn, &fl6->saddr); |
1237 | if (fn) | |
1238 | goto restart; | |
2b760fcf | 1239 | |
af52a52c DA |
1240 | rt = net->ipv6.ip6_null_entry; |
1241 | dst_hold(&rt->dst); | |
1242 | goto out; | |
f88d8ea6 DA |
1243 | } else if (res.fib6_flags & RTF_REJECT) { |
1244 | goto do_create; | |
af52a52c | 1245 | } |
d3843fe5 | 1246 | |
b1d40991 DA |
1247 | fib6_select_path(net, &res, fl6, fl6->flowi6_oif, |
1248 | fl6->flowi6_oif != 0, skb, flags); | |
1249 | ||
2b760fcf | 1250 | /* Search through exception table */ |
7e4b5128 | 1251 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 1252 | if (rt) { |
10585b43 | 1253 | if (ip6_hold_safe(net, &rt)) |
dec9b0e2 | 1254 | dst_use_noref(&rt->dst, jiffies); |
23fb93a4 | 1255 | } else { |
f88d8ea6 | 1256 | do_create: |
9b6b35ab | 1257 | rt = ip6_create_rt_rcu(&res); |
dec9b0e2 | 1258 | } |
b811580d | 1259 | |
af52a52c | 1260 | out: |
8ff2e5b2 | 1261 | trace_fib6_table_lookup(net, &res, table, fl6); |
af52a52c | 1262 | |
66f5d6ce | 1263 | rcu_read_unlock(); |
b811580d | 1264 | |
c71099ac | 1265 | return rt; |
c71099ac TG |
1266 | } |
1267 | ||
67ba4152 | 1268 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 1269 | const struct sk_buff *skb, int flags) |
ea6e574e | 1270 | { |
b75cc8f9 | 1271 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup); |
ea6e574e FW |
1272 | } |
1273 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
1274 | ||
9acd9f3a | 1275 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
1276 | const struct in6_addr *saddr, int oif, |
1277 | const struct sk_buff *skb, int strict) | |
c71099ac | 1278 | { |
4c9483b2 DM |
1279 | struct flowi6 fl6 = { |
1280 | .flowi6_oif = oif, | |
1281 | .daddr = *daddr, | |
c71099ac TG |
1282 | }; |
1283 | struct dst_entry *dst; | |
77d16f45 | 1284 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 1285 | |
adaa70bb | 1286 | if (saddr) { |
4c9483b2 | 1287 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
1288 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
1289 | } | |
1290 | ||
b75cc8f9 | 1291 | dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup); |
c71099ac TG |
1292 | if (dst->error == 0) |
1293 | return (struct rt6_info *) dst; | |
1294 | ||
1295 | dst_release(dst); | |
1296 | ||
1da177e4 LT |
1297 | return NULL; |
1298 | } | |
7159039a YH |
1299 | EXPORT_SYMBOL(rt6_lookup); |
1300 | ||
c71099ac | 1301 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1cfb71ee WW |
1302 | * It takes new route entry, the addition fails by any reason the |
1303 | * route is released. | |
1304 | * Caller must hold dst before calling it. | |
1da177e4 LT |
1305 | */ |
1306 | ||
8d1c802b | 1307 | static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info, |
333c4301 | 1308 | struct netlink_ext_ack *extack) |
1da177e4 LT |
1309 | { |
1310 | int err; | |
c71099ac | 1311 | struct fib6_table *table; |
1da177e4 | 1312 | |
93c2fb25 | 1313 | table = rt->fib6_table; |
66f5d6ce | 1314 | spin_lock_bh(&table->tb6_lock); |
d4ead6b3 | 1315 | err = fib6_add(&table->tb6_root, rt, info, extack); |
66f5d6ce | 1316 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1317 | |
1318 | return err; | |
1319 | } | |
1320 | ||
8d1c802b | 1321 | int ip6_ins_rt(struct net *net, struct fib6_info *rt) |
40e22e8f | 1322 | { |
afb1d4b5 | 1323 | struct nl_info info = { .nl_net = net, }; |
e715b6d3 | 1324 | |
d4ead6b3 | 1325 | return __ip6_ins_rt(rt, &info, NULL); |
40e22e8f TG |
1326 | } |
1327 | ||
85bd05de | 1328 | static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res, |
8b9df265 MKL |
1329 | const struct in6_addr *daddr, |
1330 | const struct in6_addr *saddr) | |
1da177e4 | 1331 | { |
85bd05de | 1332 | struct fib6_info *f6i = res->f6i; |
4832c30d | 1333 | struct net_device *dev; |
1da177e4 LT |
1334 | struct rt6_info *rt; |
1335 | ||
1336 | /* | |
1337 | * Clone the route. | |
1338 | */ | |
1339 | ||
85bd05de | 1340 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1341 | return NULL; |
1342 | ||
0d161581 | 1343 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1344 | rt = ip6_dst_alloc(dev_net(dev), dev, 0); |
e873e4b9 | 1345 | if (!rt) { |
85bd05de | 1346 | fib6_info_release(f6i); |
83a09abd | 1347 | return NULL; |
e873e4b9 | 1348 | } |
83a09abd | 1349 | |
0d161581 | 1350 | ip6_rt_copy_init(rt, res); |
83a09abd | 1351 | rt->rt6i_flags |= RTF_CACHE; |
83a09abd MKL |
1352 | rt->dst.flags |= DST_HOST; |
1353 | rt->rt6i_dst.addr = *daddr; | |
1354 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 1355 | |
85bd05de DA |
1356 | if (!rt6_is_gw_or_nonexthop(res)) { |
1357 | if (f6i->fib6_dst.plen != 128 && | |
1358 | ipv6_addr_equal(&f6i->fib6_dst.addr, daddr)) | |
83a09abd | 1359 | rt->rt6i_flags |= RTF_ANYCAST; |
1da177e4 | 1360 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
1361 | if (rt->rt6i_src.plen && saddr) { |
1362 | rt->rt6i_src.addr = *saddr; | |
1363 | rt->rt6i_src.plen = 128; | |
8b9df265 | 1364 | } |
83a09abd | 1365 | #endif |
95a9a5ba | 1366 | } |
1da177e4 | 1367 | |
95a9a5ba YH |
1368 | return rt; |
1369 | } | |
1da177e4 | 1370 | |
db3fedee | 1371 | static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res) |
d52d3997 | 1372 | { |
db3fedee DA |
1373 | struct fib6_info *f6i = res->f6i; |
1374 | unsigned short flags = fib6_info_dst_flags(f6i); | |
4832c30d | 1375 | struct net_device *dev; |
d52d3997 MKL |
1376 | struct rt6_info *pcpu_rt; |
1377 | ||
db3fedee | 1378 | if (!fib6_info_hold_safe(f6i)) |
e873e4b9 WW |
1379 | return NULL; |
1380 | ||
4832c30d | 1381 | rcu_read_lock(); |
0d161581 | 1382 | dev = ip6_rt_get_dev_rcu(res); |
93531c67 | 1383 | pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags); |
4832c30d | 1384 | rcu_read_unlock(); |
e873e4b9 | 1385 | if (!pcpu_rt) { |
db3fedee | 1386 | fib6_info_release(f6i); |
d52d3997 | 1387 | return NULL; |
e873e4b9 | 1388 | } |
0d161581 | 1389 | ip6_rt_copy_init(pcpu_rt, res); |
d52d3997 MKL |
1390 | pcpu_rt->rt6i_flags |= RTF_PCPU; |
1391 | return pcpu_rt; | |
1392 | } | |
1393 | ||
66f5d6ce | 1394 | /* It should be called with rcu_read_lock() acquired */ |
db3fedee | 1395 | static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res) |
d52d3997 | 1396 | { |
c353071a | 1397 | struct rt6_info *pcpu_rt; |
d52d3997 | 1398 | |
c353071a | 1399 | pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu); |
d52d3997 | 1400 | |
a73e4195 MKL |
1401 | return pcpu_rt; |
1402 | } | |
1403 | ||
afb1d4b5 | 1404 | static struct rt6_info *rt6_make_pcpu_route(struct net *net, |
db3fedee | 1405 | const struct fib6_result *res) |
a73e4195 MKL |
1406 | { |
1407 | struct rt6_info *pcpu_rt, *prev, **p; | |
d52d3997 | 1408 | |
db3fedee | 1409 | pcpu_rt = ip6_rt_pcpu_alloc(res); |
0e09edcc WW |
1410 | if (!pcpu_rt) |
1411 | return NULL; | |
d52d3997 | 1412 | |
f40b6ae2 | 1413 | p = this_cpu_ptr(res->nh->rt6i_pcpu); |
a94b9367 | 1414 | prev = cmpxchg(p, NULL, pcpu_rt); |
951f788a | 1415 | BUG_ON(prev); |
a94b9367 | 1416 | |
61fb0d01 ED |
1417 | if (res->f6i->fib6_destroying) { |
1418 | struct fib6_info *from; | |
1419 | ||
1420 | from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL); | |
1421 | fib6_info_release(from); | |
1422 | } | |
1423 | ||
d52d3997 MKL |
1424 | return pcpu_rt; |
1425 | } | |
1426 | ||
35732d01 WW |
1427 | /* exception hash table implementation |
1428 | */ | |
1429 | static DEFINE_SPINLOCK(rt6_exception_lock); | |
1430 | ||
1431 | /* Remove rt6_ex from hash table and free the memory | |
1432 | * Caller must hold rt6_exception_lock | |
1433 | */ | |
1434 | static void rt6_remove_exception(struct rt6_exception_bucket *bucket, | |
1435 | struct rt6_exception *rt6_ex) | |
1436 | { | |
f5b51fe8 | 1437 | struct fib6_info *from; |
b2427e67 | 1438 | struct net *net; |
81eb8447 | 1439 | |
35732d01 WW |
1440 | if (!bucket || !rt6_ex) |
1441 | return; | |
b2427e67 CIK |
1442 | |
1443 | net = dev_net(rt6_ex->rt6i->dst.dev); | |
f5b51fe8 PA |
1444 | net->ipv6.rt6_stats->fib_rt_cache--; |
1445 | ||
1446 | /* purge completely the exception to allow releasing the held resources: | |
1447 | * some [sk] cache may keep the dst around for unlimited time | |
1448 | */ | |
0e233874 | 1449 | from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL); |
f5b51fe8 PA |
1450 | fib6_info_release(from); |
1451 | dst_dev_put(&rt6_ex->rt6i->dst); | |
1452 | ||
35732d01 | 1453 | hlist_del_rcu(&rt6_ex->hlist); |
77634cc6 | 1454 | dst_release(&rt6_ex->rt6i->dst); |
35732d01 WW |
1455 | kfree_rcu(rt6_ex, rcu); |
1456 | WARN_ON_ONCE(!bucket->depth); | |
1457 | bucket->depth--; | |
1458 | } | |
1459 | ||
1460 | /* Remove oldest rt6_ex in bucket and free the memory | |
1461 | * Caller must hold rt6_exception_lock | |
1462 | */ | |
1463 | static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket) | |
1464 | { | |
1465 | struct rt6_exception *rt6_ex, *oldest = NULL; | |
1466 | ||
1467 | if (!bucket) | |
1468 | return; | |
1469 | ||
1470 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
1471 | if (!oldest || time_before(rt6_ex->stamp, oldest->stamp)) | |
1472 | oldest = rt6_ex; | |
1473 | } | |
1474 | rt6_remove_exception(bucket, oldest); | |
1475 | } | |
1476 | ||
1477 | static u32 rt6_exception_hash(const struct in6_addr *dst, | |
1478 | const struct in6_addr *src) | |
1479 | { | |
1480 | static u32 seed __read_mostly; | |
1481 | u32 val; | |
1482 | ||
1483 | net_get_random_once(&seed, sizeof(seed)); | |
b6b556af | 1484 | val = jhash2((const u32 *)dst, sizeof(*dst)/sizeof(u32), seed); |
35732d01 WW |
1485 | |
1486 | #ifdef CONFIG_IPV6_SUBTREES | |
1487 | if (src) | |
b6b556af | 1488 | val = jhash2((const u32 *)src, sizeof(*src)/sizeof(u32), val); |
35732d01 WW |
1489 | #endif |
1490 | return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT); | |
1491 | } | |
1492 | ||
1493 | /* Helper function to find the cached rt in the hash table | |
1494 | * and update bucket pointer to point to the bucket for this | |
1495 | * (daddr, saddr) pair | |
1496 | * Caller must hold rt6_exception_lock | |
1497 | */ | |
1498 | static struct rt6_exception * | |
1499 | __rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket, | |
1500 | const struct in6_addr *daddr, | |
1501 | const struct in6_addr *saddr) | |
1502 | { | |
1503 | struct rt6_exception *rt6_ex; | |
1504 | u32 hval; | |
1505 | ||
1506 | if (!(*bucket) || !daddr) | |
1507 | return NULL; | |
1508 | ||
1509 | hval = rt6_exception_hash(daddr, saddr); | |
1510 | *bucket += hval; | |
1511 | ||
1512 | hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) { | |
1513 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1514 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1515 | ||
1516 | #ifdef CONFIG_IPV6_SUBTREES | |
1517 | if (matched && saddr) | |
1518 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1519 | #endif | |
1520 | if (matched) | |
1521 | return rt6_ex; | |
1522 | } | |
1523 | return NULL; | |
1524 | } | |
1525 | ||
1526 | /* Helper function to find the cached rt in the hash table | |
1527 | * and update bucket pointer to point to the bucket for this | |
1528 | * (daddr, saddr) pair | |
1529 | * Caller must hold rcu_read_lock() | |
1530 | */ | |
1531 | static struct rt6_exception * | |
1532 | __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket, | |
1533 | const struct in6_addr *daddr, | |
1534 | const struct in6_addr *saddr) | |
1535 | { | |
1536 | struct rt6_exception *rt6_ex; | |
1537 | u32 hval; | |
1538 | ||
1539 | WARN_ON_ONCE(!rcu_read_lock_held()); | |
1540 | ||
1541 | if (!(*bucket) || !daddr) | |
1542 | return NULL; | |
1543 | ||
1544 | hval = rt6_exception_hash(daddr, saddr); | |
1545 | *bucket += hval; | |
1546 | ||
1547 | hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) { | |
1548 | struct rt6_info *rt6 = rt6_ex->rt6i; | |
1549 | bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr); | |
1550 | ||
1551 | #ifdef CONFIG_IPV6_SUBTREES | |
1552 | if (matched && saddr) | |
1553 | matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr); | |
1554 | #endif | |
1555 | if (matched) | |
1556 | return rt6_ex; | |
1557 | } | |
1558 | return NULL; | |
1559 | } | |
1560 | ||
b748f260 | 1561 | static unsigned int fib6_mtu(const struct fib6_result *res) |
d4ead6b3 | 1562 | { |
b748f260 | 1563 | const struct fib6_nh *nh = res->nh; |
d4ead6b3 DA |
1564 | unsigned int mtu; |
1565 | ||
b748f260 DA |
1566 | if (res->f6i->fib6_pmtu) { |
1567 | mtu = res->f6i->fib6_pmtu; | |
dcd1f572 | 1568 | } else { |
b748f260 | 1569 | struct net_device *dev = nh->fib_nh_dev; |
dcd1f572 DA |
1570 | struct inet6_dev *idev; |
1571 | ||
1572 | rcu_read_lock(); | |
1573 | idev = __in6_dev_get(dev); | |
1574 | mtu = idev->cnf.mtu6; | |
1575 | rcu_read_unlock(); | |
1576 | } | |
1577 | ||
d4ead6b3 DA |
1578 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1579 | ||
b748f260 | 1580 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
d4ead6b3 DA |
1581 | } |
1582 | ||
cc5c073a DA |
1583 | #define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL |
1584 | ||
1585 | /* used when the flushed bit is not relevant, only access to the bucket | |
1586 | * (ie., all bucket users except rt6_insert_exception); | |
1587 | * | |
1588 | * called under rcu lock; sometimes called with rt6_exception_lock held | |
1589 | */ | |
1590 | static | |
1591 | struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh, | |
1592 | spinlock_t *lock) | |
1593 | { | |
1594 | struct rt6_exception_bucket *bucket; | |
1595 | ||
1596 | if (lock) | |
1597 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1598 | lockdep_is_held(lock)); | |
1599 | else | |
1600 | bucket = rcu_dereference(nh->rt6i_exception_bucket); | |
1601 | ||
1602 | /* remove bucket flushed bit if set */ | |
1603 | if (bucket) { | |
1604 | unsigned long p = (unsigned long)bucket; | |
1605 | ||
1606 | p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1607 | bucket = (struct rt6_exception_bucket *)p; | |
1608 | } | |
1609 | ||
1610 | return bucket; | |
1611 | } | |
1612 | ||
1613 | static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket) | |
1614 | { | |
1615 | unsigned long p = (unsigned long)bucket; | |
1616 | ||
1617 | return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED); | |
1618 | } | |
1619 | ||
1620 | /* called with rt6_exception_lock held */ | |
1621 | static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh, | |
1622 | spinlock_t *lock) | |
1623 | { | |
1624 | struct rt6_exception_bucket *bucket; | |
1625 | unsigned long p; | |
1626 | ||
1627 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, | |
1628 | lockdep_is_held(lock)); | |
1629 | ||
1630 | p = (unsigned long)bucket; | |
1631 | p |= FIB6_EXCEPTION_BUCKET_FLUSHED; | |
1632 | bucket = (struct rt6_exception_bucket *)p; | |
1633 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); | |
1634 | } | |
1635 | ||
35732d01 | 1636 | static int rt6_insert_exception(struct rt6_info *nrt, |
5012f0a5 | 1637 | const struct fib6_result *res) |
35732d01 | 1638 | { |
5e670d84 | 1639 | struct net *net = dev_net(nrt->dst.dev); |
35732d01 | 1640 | struct rt6_exception_bucket *bucket; |
cc5c073a | 1641 | struct fib6_info *f6i = res->f6i; |
35732d01 WW |
1642 | struct in6_addr *src_key = NULL; |
1643 | struct rt6_exception *rt6_ex; | |
cc5c073a | 1644 | struct fib6_nh *nh = res->nh; |
35732d01 WW |
1645 | int err = 0; |
1646 | ||
35732d01 WW |
1647 | spin_lock_bh(&rt6_exception_lock); |
1648 | ||
cc5c073a DA |
1649 | bucket = rcu_dereference_protected(nh->rt6i_exception_bucket, |
1650 | lockdep_is_held(&rt6_exception_lock)); | |
35732d01 WW |
1651 | if (!bucket) { |
1652 | bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket), | |
1653 | GFP_ATOMIC); | |
1654 | if (!bucket) { | |
1655 | err = -ENOMEM; | |
1656 | goto out; | |
1657 | } | |
cc5c073a DA |
1658 | rcu_assign_pointer(nh->rt6i_exception_bucket, bucket); |
1659 | } else if (fib6_nh_excptn_bucket_flushed(bucket)) { | |
1660 | err = -EINVAL; | |
1661 | goto out; | |
35732d01 WW |
1662 | } |
1663 | ||
1664 | #ifdef CONFIG_IPV6_SUBTREES | |
5012f0a5 | 1665 | /* fib6_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1666 | * and exception table is indexed by a hash of |
5012f0a5 | 1667 | * both fib6_dst and fib6_src. |
35732d01 | 1668 | * Otherwise, the exception table is indexed by |
5012f0a5 | 1669 | * a hash of only fib6_dst. |
35732d01 | 1670 | */ |
5012f0a5 | 1671 | if (f6i->fib6_src.plen) |
35732d01 WW |
1672 | src_key = &nrt->rt6i_src.addr; |
1673 | #endif | |
5012f0a5 | 1674 | /* rt6_mtu_change() might lower mtu on f6i. |
f5bbe7ee | 1675 | * Only insert this exception route if its mtu |
5012f0a5 | 1676 | * is less than f6i's mtu value. |
f5bbe7ee | 1677 | */ |
b748f260 | 1678 | if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) { |
f5bbe7ee WW |
1679 | err = -EINVAL; |
1680 | goto out; | |
1681 | } | |
60006a48 | 1682 | |
35732d01 WW |
1683 | rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr, |
1684 | src_key); | |
1685 | if (rt6_ex) | |
1686 | rt6_remove_exception(bucket, rt6_ex); | |
1687 | ||
1688 | rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC); | |
1689 | if (!rt6_ex) { | |
1690 | err = -ENOMEM; | |
1691 | goto out; | |
1692 | } | |
1693 | rt6_ex->rt6i = nrt; | |
1694 | rt6_ex->stamp = jiffies; | |
35732d01 WW |
1695 | hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain); |
1696 | bucket->depth++; | |
81eb8447 | 1697 | net->ipv6.rt6_stats->fib_rt_cache++; |
35732d01 WW |
1698 | |
1699 | if (bucket->depth > FIB6_MAX_DEPTH) | |
1700 | rt6_exception_remove_oldest(bucket); | |
1701 | ||
1702 | out: | |
1703 | spin_unlock_bh(&rt6_exception_lock); | |
1704 | ||
1705 | /* Update fn->fn_sernum to invalidate all cached dst */ | |
b886d5f2 | 1706 | if (!err) { |
5012f0a5 DA |
1707 | spin_lock_bh(&f6i->fib6_table->tb6_lock); |
1708 | fib6_update_sernum(net, f6i); | |
1709 | spin_unlock_bh(&f6i->fib6_table->tb6_lock); | |
b886d5f2 PA |
1710 | fib6_force_start_gc(net); |
1711 | } | |
35732d01 WW |
1712 | |
1713 | return err; | |
1714 | } | |
1715 | ||
c0b220cf | 1716 | static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from) |
35732d01 WW |
1717 | { |
1718 | struct rt6_exception_bucket *bucket; | |
1719 | struct rt6_exception *rt6_ex; | |
1720 | struct hlist_node *tmp; | |
1721 | int i; | |
1722 | ||
1723 | spin_lock_bh(&rt6_exception_lock); | |
35732d01 | 1724 | |
cc5c073a | 1725 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
35732d01 WW |
1726 | if (!bucket) |
1727 | goto out; | |
1728 | ||
cc5c073a DA |
1729 | /* Prevent rt6_insert_exception() to recreate the bucket list */ |
1730 | if (!from) | |
1731 | fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock); | |
1732 | ||
35732d01 | 1733 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { |
cc5c073a DA |
1734 | hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) { |
1735 | if (!from || | |
1736 | rcu_access_pointer(rt6_ex->rt6i->from) == from) | |
1737 | rt6_remove_exception(bucket, rt6_ex); | |
1738 | } | |
1739 | WARN_ON_ONCE(!from && bucket->depth); | |
35732d01 WW |
1740 | bucket++; |
1741 | } | |
35732d01 WW |
1742 | out: |
1743 | spin_unlock_bh(&rt6_exception_lock); | |
1744 | } | |
1745 | ||
e659ba31 DA |
1746 | static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg) |
1747 | { | |
1748 | struct fib6_info *f6i = arg; | |
1749 | ||
1750 | fib6_nh_flush_exceptions(nh, f6i); | |
1751 | ||
1752 | return 0; | |
1753 | } | |
1754 | ||
c0b220cf DA |
1755 | void rt6_flush_exceptions(struct fib6_info *f6i) |
1756 | { | |
e659ba31 DA |
1757 | if (f6i->nh) |
1758 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions, | |
1759 | f6i); | |
1760 | else | |
1761 | fib6_nh_flush_exceptions(f6i->fib6_nh, f6i); | |
c0b220cf DA |
1762 | } |
1763 | ||
35732d01 WW |
1764 | /* Find cached rt in the hash table inside passed in rt |
1765 | * Caller has to hold rcu_read_lock() | |
1766 | */ | |
7e4b5128 | 1767 | static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res, |
510e2ced WW |
1768 | const struct in6_addr *daddr, |
1769 | const struct in6_addr *saddr) | |
35732d01 | 1770 | { |
510e2ced | 1771 | const struct in6_addr *src_key = NULL; |
35732d01 | 1772 | struct rt6_exception_bucket *bucket; |
35732d01 | 1773 | struct rt6_exception *rt6_ex; |
7e4b5128 | 1774 | struct rt6_info *ret = NULL; |
35732d01 | 1775 | |
35732d01 | 1776 | #ifdef CONFIG_IPV6_SUBTREES |
7e4b5128 | 1777 | /* fib6i_src.plen != 0 indicates f6i is in subtree |
35732d01 | 1778 | * and exception table is indexed by a hash of |
7e4b5128 | 1779 | * both fib6_dst and fib6_src. |
510e2ced WW |
1780 | * However, the src addr used to create the hash |
1781 | * might not be exactly the passed in saddr which | |
1782 | * is a /128 addr from the flow. | |
1783 | * So we need to use f6i->fib6_src to redo lookup | |
1784 | * if the passed in saddr does not find anything. | |
1785 | * (See the logic in ip6_rt_cache_alloc() on how | |
1786 | * rt->rt6i_src is updated.) | |
35732d01 | 1787 | */ |
7e4b5128 | 1788 | if (res->f6i->fib6_src.plen) |
35732d01 | 1789 | src_key = saddr; |
510e2ced | 1790 | find_ex: |
35732d01 | 1791 | #endif |
cc5c073a | 1792 | bucket = fib6_nh_get_excptn_bucket(res->nh, NULL); |
35732d01 WW |
1793 | rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key); |
1794 | ||
1795 | if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i)) | |
7e4b5128 | 1796 | ret = rt6_ex->rt6i; |
35732d01 | 1797 | |
510e2ced WW |
1798 | #ifdef CONFIG_IPV6_SUBTREES |
1799 | /* Use fib6_src as src_key and redo lookup */ | |
1800 | if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) { | |
1801 | src_key = &res->f6i->fib6_src.addr; | |
1802 | goto find_ex; | |
1803 | } | |
1804 | #endif | |
1805 | ||
7e4b5128 | 1806 | return ret; |
35732d01 WW |
1807 | } |
1808 | ||
1809 | /* Remove the passed in cached rt from the hash table that contains it */ | |
cc5c073a | 1810 | static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1811 | const struct rt6_info *rt) |
35732d01 | 1812 | { |
c0b220cf | 1813 | const struct in6_addr *src_key = NULL; |
35732d01 | 1814 | struct rt6_exception_bucket *bucket; |
35732d01 WW |
1815 | struct rt6_exception *rt6_ex; |
1816 | int err; | |
1817 | ||
cc5c073a | 1818 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
35732d01 WW |
1819 | return -ENOENT; |
1820 | ||
1821 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a DA |
1822 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
1823 | ||
35732d01 | 1824 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1825 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1826 | * and exception table is indexed by a hash of | |
1827 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1828 | * Otherwise, the exception table is indexed by |
1829 | * a hash of only rt6i_dst. | |
1830 | */ | |
c0b220cf | 1831 | if (plen) |
35732d01 WW |
1832 | src_key = &rt->rt6i_src.addr; |
1833 | #endif | |
1834 | rt6_ex = __rt6_find_exception_spinlock(&bucket, | |
1835 | &rt->rt6i_dst.addr, | |
1836 | src_key); | |
1837 | if (rt6_ex) { | |
1838 | rt6_remove_exception(bucket, rt6_ex); | |
1839 | err = 0; | |
1840 | } else { | |
1841 | err = -ENOENT; | |
1842 | } | |
1843 | ||
1844 | spin_unlock_bh(&rt6_exception_lock); | |
1845 | return err; | |
1846 | } | |
1847 | ||
e659ba31 DA |
1848 | struct fib6_nh_excptn_arg { |
1849 | struct rt6_info *rt; | |
1850 | int plen; | |
1851 | }; | |
1852 | ||
1853 | static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg) | |
1854 | { | |
1855 | struct fib6_nh_excptn_arg *arg = _arg; | |
1856 | int err; | |
1857 | ||
1858 | err = fib6_nh_remove_exception(nh, arg->plen, arg->rt); | |
1859 | if (err == 0) | |
1860 | return 1; | |
1861 | ||
1862 | return 0; | |
1863 | } | |
1864 | ||
c0b220cf DA |
1865 | static int rt6_remove_exception_rt(struct rt6_info *rt) |
1866 | { | |
1867 | struct fib6_info *from; | |
1868 | ||
1869 | from = rcu_dereference(rt->from); | |
cc5c073a | 1870 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) |
c0b220cf DA |
1871 | return -EINVAL; |
1872 | ||
e659ba31 DA |
1873 | if (from->nh) { |
1874 | struct fib6_nh_excptn_arg arg = { | |
1875 | .rt = rt, | |
1876 | .plen = from->fib6_src.plen | |
1877 | }; | |
1878 | int rc; | |
1879 | ||
1880 | /* rc = 1 means an entry was found */ | |
1881 | rc = nexthop_for_each_fib6_nh(from->nh, | |
1882 | rt6_nh_remove_exception_rt, | |
1883 | &arg); | |
1884 | return rc ? 0 : -ENOENT; | |
1885 | } | |
1886 | ||
1cf844c7 | 1887 | return fib6_nh_remove_exception(from->fib6_nh, |
cc5c073a | 1888 | from->fib6_src.plen, rt); |
c0b220cf DA |
1889 | } |
1890 | ||
35732d01 WW |
1891 | /* Find rt6_ex which contains the passed in rt cache and |
1892 | * refresh its stamp | |
1893 | */ | |
cc5c073a | 1894 | static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen, |
c0b220cf | 1895 | const struct rt6_info *rt) |
35732d01 | 1896 | { |
c0b220cf | 1897 | const struct in6_addr *src_key = NULL; |
35732d01 | 1898 | struct rt6_exception_bucket *bucket; |
35732d01 | 1899 | struct rt6_exception *rt6_ex; |
193f3685 | 1900 | |
cc5c073a | 1901 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); |
35732d01 | 1902 | #ifdef CONFIG_IPV6_SUBTREES |
cc5c073a DA |
1903 | /* rt6i_src.plen != 0 indicates 'from' is in subtree |
1904 | * and exception table is indexed by a hash of | |
1905 | * both rt6i_dst and rt6i_src. | |
35732d01 WW |
1906 | * Otherwise, the exception table is indexed by |
1907 | * a hash of only rt6i_dst. | |
1908 | */ | |
c0b220cf | 1909 | if (plen) |
35732d01 WW |
1910 | src_key = &rt->rt6i_src.addr; |
1911 | #endif | |
cc5c073a | 1912 | rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key); |
35732d01 WW |
1913 | if (rt6_ex) |
1914 | rt6_ex->stamp = jiffies; | |
c0b220cf DA |
1915 | } |
1916 | ||
e659ba31 DA |
1917 | struct fib6_nh_match_arg { |
1918 | const struct net_device *dev; | |
1919 | const struct in6_addr *gw; | |
1920 | struct fib6_nh *match; | |
1921 | }; | |
1922 | ||
1923 | /* determine if fib6_nh has given device and gateway */ | |
1924 | static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg) | |
1925 | { | |
1926 | struct fib6_nh_match_arg *arg = _arg; | |
1927 | ||
1928 | if (arg->dev != nh->fib_nh_dev || | |
1929 | (arg->gw && !nh->fib_nh_gw_family) || | |
1930 | (!arg->gw && nh->fib_nh_gw_family) || | |
1931 | (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6))) | |
1932 | return 0; | |
1933 | ||
1934 | arg->match = nh; | |
1935 | ||
1936 | /* found a match, break the loop */ | |
1937 | return 1; | |
1938 | } | |
1939 | ||
c0b220cf DA |
1940 | static void rt6_update_exception_stamp_rt(struct rt6_info *rt) |
1941 | { | |
1942 | struct fib6_info *from; | |
e659ba31 | 1943 | struct fib6_nh *fib6_nh; |
35732d01 | 1944 | |
c0b220cf DA |
1945 | rcu_read_lock(); |
1946 | ||
1947 | from = rcu_dereference(rt->from); | |
1948 | if (!from || !(rt->rt6i_flags & RTF_CACHE)) | |
1949 | goto unlock; | |
1950 | ||
e659ba31 DA |
1951 | if (from->nh) { |
1952 | struct fib6_nh_match_arg arg = { | |
1953 | .dev = rt->dst.dev, | |
1954 | .gw = &rt->rt6i_gateway, | |
1955 | }; | |
1956 | ||
1957 | nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg); | |
1958 | ||
1959 | if (!arg.match) | |
cff6a327 | 1960 | goto unlock; |
e659ba31 DA |
1961 | fib6_nh = arg.match; |
1962 | } else { | |
1963 | fib6_nh = from->fib6_nh; | |
1964 | } | |
1965 | fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt); | |
193f3685 | 1966 | unlock: |
35732d01 WW |
1967 | rcu_read_unlock(); |
1968 | } | |
1969 | ||
e9fa1495 SB |
1970 | static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev, |
1971 | struct rt6_info *rt, int mtu) | |
1972 | { | |
1973 | /* If the new MTU is lower than the route PMTU, this new MTU will be the | |
1974 | * lowest MTU in the path: always allow updating the route PMTU to | |
1975 | * reflect PMTU decreases. | |
1976 | * | |
1977 | * If the new MTU is higher, and the route PMTU is equal to the local | |
1978 | * MTU, this means the old MTU is the lowest in the path, so allow | |
1979 | * updating it: if other nodes now have lower MTUs, PMTU discovery will | |
1980 | * handle this. | |
1981 | */ | |
1982 | ||
1983 | if (dst_mtu(&rt->dst) >= mtu) | |
1984 | return true; | |
1985 | ||
1986 | if (dst_mtu(&rt->dst) == idev->cnf.mtu6) | |
1987 | return true; | |
1988 | ||
1989 | return false; | |
1990 | } | |
1991 | ||
1992 | static void rt6_exceptions_update_pmtu(struct inet6_dev *idev, | |
cc5c073a | 1993 | const struct fib6_nh *nh, int mtu) |
f5bbe7ee WW |
1994 | { |
1995 | struct rt6_exception_bucket *bucket; | |
1996 | struct rt6_exception *rt6_ex; | |
1997 | int i; | |
1998 | ||
cc5c073a | 1999 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
e9fa1495 SB |
2000 | if (!bucket) |
2001 | return; | |
2002 | ||
2003 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2004 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
2005 | struct rt6_info *entry = rt6_ex->rt6i; | |
2006 | ||
2007 | /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected | |
d4ead6b3 | 2008 | * route), the metrics of its rt->from have already |
e9fa1495 SB |
2009 | * been updated. |
2010 | */ | |
d4ead6b3 | 2011 | if (dst_metric_raw(&entry->dst, RTAX_MTU) && |
e9fa1495 | 2012 | rt6_mtu_change_route_allowed(idev, entry, mtu)) |
d4ead6b3 | 2013 | dst_metric_set(&entry->dst, RTAX_MTU, mtu); |
f5bbe7ee | 2014 | } |
e9fa1495 | 2015 | bucket++; |
f5bbe7ee WW |
2016 | } |
2017 | } | |
2018 | ||
b16cb459 WW |
2019 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) |
2020 | ||
cc5c073a DA |
2021 | static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh, |
2022 | const struct in6_addr *gateway) | |
b16cb459 WW |
2023 | { |
2024 | struct rt6_exception_bucket *bucket; | |
2025 | struct rt6_exception *rt6_ex; | |
2026 | struct hlist_node *tmp; | |
2027 | int i; | |
2028 | ||
cc5c073a | 2029 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
b16cb459 WW |
2030 | return; |
2031 | ||
2032 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 2033 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
b16cb459 WW |
2034 | if (bucket) { |
2035 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2036 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2037 | &bucket->chain, hlist) { | |
2038 | struct rt6_info *entry = rt6_ex->rt6i; | |
2039 | ||
2040 | if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) == | |
2041 | RTF_CACHE_GATEWAY && | |
2042 | ipv6_addr_equal(gateway, | |
2043 | &entry->rt6i_gateway)) { | |
2044 | rt6_remove_exception(bucket, rt6_ex); | |
2045 | } | |
2046 | } | |
2047 | bucket++; | |
2048 | } | |
2049 | } | |
2050 | ||
2051 | spin_unlock_bh(&rt6_exception_lock); | |
2052 | } | |
2053 | ||
c757faa8 WW |
2054 | static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket, |
2055 | struct rt6_exception *rt6_ex, | |
2056 | struct fib6_gc_args *gc_args, | |
2057 | unsigned long now) | |
2058 | { | |
2059 | struct rt6_info *rt = rt6_ex->rt6i; | |
2060 | ||
1859bac0 PA |
2061 | /* we are pruning and obsoleting aged-out and non gateway exceptions |
2062 | * even if others have still references to them, so that on next | |
2063 | * dst_check() such references can be dropped. | |
2064 | * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when | |
2065 | * expired, independently from their aging, as per RFC 8201 section 4 | |
2066 | */ | |
31afeb42 WW |
2067 | if (!(rt->rt6i_flags & RTF_EXPIRES)) { |
2068 | if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) { | |
2069 | RT6_TRACE("aging clone %p\n", rt); | |
2070 | rt6_remove_exception(bucket, rt6_ex); | |
2071 | return; | |
2072 | } | |
2073 | } else if (time_after(jiffies, rt->dst.expires)) { | |
2074 | RT6_TRACE("purging expired route %p\n", rt); | |
c757faa8 WW |
2075 | rt6_remove_exception(bucket, rt6_ex); |
2076 | return; | |
31afeb42 WW |
2077 | } |
2078 | ||
2079 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
c757faa8 WW |
2080 | struct neighbour *neigh; |
2081 | __u8 neigh_flags = 0; | |
2082 | ||
1bfa26ff ED |
2083 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); |
2084 | if (neigh) | |
c757faa8 | 2085 | neigh_flags = neigh->flags; |
1bfa26ff | 2086 | |
c757faa8 WW |
2087 | if (!(neigh_flags & NTF_ROUTER)) { |
2088 | RT6_TRACE("purging route %p via non-router but gateway\n", | |
2089 | rt); | |
2090 | rt6_remove_exception(bucket, rt6_ex); | |
2091 | return; | |
2092 | } | |
2093 | } | |
31afeb42 | 2094 | |
c757faa8 WW |
2095 | gc_args->more++; |
2096 | } | |
2097 | ||
cc5c073a | 2098 | static void fib6_nh_age_exceptions(const struct fib6_nh *nh, |
c0b220cf DA |
2099 | struct fib6_gc_args *gc_args, |
2100 | unsigned long now) | |
c757faa8 WW |
2101 | { |
2102 | struct rt6_exception_bucket *bucket; | |
2103 | struct rt6_exception *rt6_ex; | |
2104 | struct hlist_node *tmp; | |
2105 | int i; | |
2106 | ||
cc5c073a | 2107 | if (!rcu_access_pointer(nh->rt6i_exception_bucket)) |
c757faa8 WW |
2108 | return; |
2109 | ||
1bfa26ff ED |
2110 | rcu_read_lock_bh(); |
2111 | spin_lock(&rt6_exception_lock); | |
cc5c073a | 2112 | bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock); |
c757faa8 WW |
2113 | if (bucket) { |
2114 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
2115 | hlist_for_each_entry_safe(rt6_ex, tmp, | |
2116 | &bucket->chain, hlist) { | |
2117 | rt6_age_examine_exception(bucket, rt6_ex, | |
2118 | gc_args, now); | |
2119 | } | |
2120 | bucket++; | |
2121 | } | |
2122 | } | |
1bfa26ff ED |
2123 | spin_unlock(&rt6_exception_lock); |
2124 | rcu_read_unlock_bh(); | |
c757faa8 WW |
2125 | } |
2126 | ||
e659ba31 DA |
2127 | struct fib6_nh_age_excptn_arg { |
2128 | struct fib6_gc_args *gc_args; | |
2129 | unsigned long now; | |
2130 | }; | |
2131 | ||
2132 | static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg) | |
2133 | { | |
2134 | struct fib6_nh_age_excptn_arg *arg = _arg; | |
2135 | ||
2136 | fib6_nh_age_exceptions(nh, arg->gc_args, arg->now); | |
2137 | return 0; | |
2138 | } | |
2139 | ||
cc5c073a | 2140 | void rt6_age_exceptions(struct fib6_info *f6i, |
c0b220cf DA |
2141 | struct fib6_gc_args *gc_args, |
2142 | unsigned long now) | |
2143 | { | |
e659ba31 DA |
2144 | if (f6i->nh) { |
2145 | struct fib6_nh_age_excptn_arg arg = { | |
2146 | .gc_args = gc_args, | |
2147 | .now = now | |
2148 | }; | |
2149 | ||
2150 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions, | |
2151 | &arg); | |
2152 | } else { | |
2153 | fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now); | |
2154 | } | |
c0b220cf DA |
2155 | } |
2156 | ||
1d053da9 | 2157 | /* must be called with rcu lock held */ |
effda4dd DA |
2158 | int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif, |
2159 | struct flowi6 *fl6, struct fib6_result *res, int strict) | |
1da177e4 | 2160 | { |
367efcb9 | 2161 | struct fib6_node *fn, *saved_fn; |
1da177e4 | 2162 | |
6454743b | 2163 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 2164 | saved_fn = fn; |
1da177e4 | 2165 | |
ca254490 DA |
2166 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
2167 | oif = 0; | |
2168 | ||
a3c00e46 | 2169 | redo_rt6_select: |
effda4dd DA |
2170 | rt6_select(net, fn, oif, res, strict); |
2171 | if (res->f6i == net->ipv6.fib6_null_entry) { | |
a3c00e46 MKL |
2172 | fn = fib6_backtrack(fn, &fl6->saddr); |
2173 | if (fn) | |
2174 | goto redo_rt6_select; | |
367efcb9 MKL |
2175 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
2176 | /* also consider unreachable route */ | |
2177 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
2178 | fn = saved_fn; | |
2179 | goto redo_rt6_select; | |
367efcb9 | 2180 | } |
a3c00e46 MKL |
2181 | } |
2182 | ||
effda4dd | 2183 | trace_fib6_table_lookup(net, res, table, fl6); |
fb9de91e | 2184 | |
effda4dd | 2185 | return 0; |
1d053da9 DA |
2186 | } |
2187 | ||
2188 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, | |
2189 | int oif, struct flowi6 *fl6, | |
2190 | const struct sk_buff *skb, int flags) | |
2191 | { | |
b1d40991 | 2192 | struct fib6_result res = {}; |
0e09edcc | 2193 | struct rt6_info *rt = NULL; |
1d053da9 DA |
2194 | int strict = 0; |
2195 | ||
0e09edcc WW |
2196 | WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) && |
2197 | !rcu_read_lock_held()); | |
2198 | ||
1d053da9 DA |
2199 | strict |= flags & RT6_LOOKUP_F_IFACE; |
2200 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; | |
2201 | if (net->ipv6.devconf_all->forwarding == 0) | |
2202 | strict |= RT6_LOOKUP_F_REACHABLE; | |
2203 | ||
2204 | rcu_read_lock(); | |
2205 | ||
effda4dd | 2206 | fib6_table_lookup(net, table, oif, fl6, &res, strict); |
0e09edcc WW |
2207 | if (res.f6i == net->ipv6.fib6_null_entry) |
2208 | goto out; | |
23fb93a4 | 2209 | |
b1d40991 | 2210 | fib6_select_path(net, &res, fl6, oif, false, skb, strict); |
d83009d4 | 2211 | |
23fb93a4 | 2212 | /*Search through exception table */ |
7e4b5128 | 2213 | rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr); |
23fb93a4 | 2214 | if (rt) { |
0e09edcc | 2215 | goto out; |
3da59bd9 | 2216 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
b1d40991 | 2217 | !res.nh->fib_nh_gw_family)) { |
3da59bd9 MKL |
2218 | /* Create a RTF_CACHE clone which will not be |
2219 | * owned by the fib6 tree. It is for the special case where | |
2220 | * the daddr in the skb during the neighbor look-up is different | |
2221 | * from the fl6->daddr used to look-up route here. | |
2222 | */ | |
0e09edcc | 2223 | rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL); |
c71099ac | 2224 | |
0e09edcc WW |
2225 | if (rt) { |
2226 | /* 1 refcnt is taken during ip6_rt_cache_alloc(). | |
2227 | * As rt6_uncached_list_add() does not consume refcnt, | |
2228 | * this refcnt is always returned to the caller even | |
2229 | * if caller sets RT6_LOOKUP_F_DST_NOREF flag. | |
1cfb71ee | 2230 | */ |
0e09edcc | 2231 | rt6_uncached_list_add(rt); |
81eb8447 | 2232 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
0e09edcc | 2233 | rcu_read_unlock(); |
b811580d | 2234 | |
0e09edcc WW |
2235 | return rt; |
2236 | } | |
d52d3997 MKL |
2237 | } else { |
2238 | /* Get a percpu copy */ | |
951f788a | 2239 | local_bh_disable(); |
0e09edcc | 2240 | rt = rt6_get_pcpu_route(&res); |
d52d3997 | 2241 | |
0e09edcc WW |
2242 | if (!rt) |
2243 | rt = rt6_make_pcpu_route(net, &res); | |
93531c67 | 2244 | |
951f788a | 2245 | local_bh_enable(); |
d52d3997 | 2246 | } |
0e09edcc WW |
2247 | out: |
2248 | if (!rt) | |
2249 | rt = net->ipv6.ip6_null_entry; | |
2250 | if (!(flags & RT6_LOOKUP_F_DST_NOREF)) | |
2251 | ip6_hold_safe(net, &rt); | |
2252 | rcu_read_unlock(); | |
2253 | ||
2254 | return rt; | |
1da177e4 | 2255 | } |
9ff74384 | 2256 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 2257 | |
b75cc8f9 DA |
2258 | static struct rt6_info *ip6_pol_route_input(struct net *net, |
2259 | struct fib6_table *table, | |
2260 | struct flowi6 *fl6, | |
2261 | const struct sk_buff *skb, | |
2262 | int flags) | |
4acad72d | 2263 | { |
b75cc8f9 | 2264 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags); |
4acad72d PE |
2265 | } |
2266 | ||
d409b847 MB |
2267 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
2268 | struct net_device *dev, | |
b75cc8f9 DA |
2269 | struct flowi6 *fl6, |
2270 | const struct sk_buff *skb, | |
2271 | int flags) | |
72331bc0 SL |
2272 | { |
2273 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
2274 | flags |= RT6_LOOKUP_F_IFACE; | |
2275 | ||
b75cc8f9 | 2276 | return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input); |
72331bc0 | 2277 | } |
d409b847 | 2278 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 2279 | |
23aebdac | 2280 | static void ip6_multipath_l3_keys(const struct sk_buff *skb, |
5e5d6fed RP |
2281 | struct flow_keys *keys, |
2282 | struct flow_keys *flkeys) | |
23aebdac JS |
2283 | { |
2284 | const struct ipv6hdr *outer_iph = ipv6_hdr(skb); | |
2285 | const struct ipv6hdr *key_iph = outer_iph; | |
5e5d6fed | 2286 | struct flow_keys *_flkeys = flkeys; |
23aebdac JS |
2287 | const struct ipv6hdr *inner_iph; |
2288 | const struct icmp6hdr *icmph; | |
2289 | struct ipv6hdr _inner_iph; | |
cea67a2d | 2290 | struct icmp6hdr _icmph; |
23aebdac JS |
2291 | |
2292 | if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6)) | |
2293 | goto out; | |
2294 | ||
cea67a2d ED |
2295 | icmph = skb_header_pointer(skb, skb_transport_offset(skb), |
2296 | sizeof(_icmph), &_icmph); | |
2297 | if (!icmph) | |
2298 | goto out; | |
2299 | ||
54074f1d | 2300 | if (!icmpv6_is_err(icmph->icmp6_type)) |
23aebdac JS |
2301 | goto out; |
2302 | ||
2303 | inner_iph = skb_header_pointer(skb, | |
2304 | skb_transport_offset(skb) + sizeof(*icmph), | |
2305 | sizeof(_inner_iph), &_inner_iph); | |
2306 | if (!inner_iph) | |
2307 | goto out; | |
2308 | ||
2309 | key_iph = inner_iph; | |
5e5d6fed | 2310 | _flkeys = NULL; |
23aebdac | 2311 | out: |
5e5d6fed RP |
2312 | if (_flkeys) { |
2313 | keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src; | |
2314 | keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst; | |
2315 | keys->tags.flow_label = _flkeys->tags.flow_label; | |
2316 | keys->basic.ip_proto = _flkeys->basic.ip_proto; | |
2317 | } else { | |
2318 | keys->addrs.v6addrs.src = key_iph->saddr; | |
2319 | keys->addrs.v6addrs.dst = key_iph->daddr; | |
fa1be7e0 | 2320 | keys->tags.flow_label = ip6_flowlabel(key_iph); |
5e5d6fed RP |
2321 | keys->basic.ip_proto = key_iph->nexthdr; |
2322 | } | |
23aebdac JS |
2323 | } |
2324 | ||
2325 | /* if skb is set it will be used and fl6 can be NULL */ | |
b4bac172 DA |
2326 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
2327 | const struct sk_buff *skb, struct flow_keys *flkeys) | |
23aebdac JS |
2328 | { |
2329 | struct flow_keys hash_keys; | |
9a2a537a | 2330 | u32 mhash; |
23aebdac | 2331 | |
bbfa047a | 2332 | switch (ip6_multipath_hash_policy(net)) { |
b4bac172 DA |
2333 | case 0: |
2334 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2335 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2336 | if (skb) { | |
2337 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2338 | } else { | |
2339 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2340 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
fa1be7e0 | 2341 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); |
b4bac172 DA |
2342 | hash_keys.basic.ip_proto = fl6->flowi6_proto; |
2343 | } | |
2344 | break; | |
2345 | case 1: | |
2346 | if (skb) { | |
2347 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
2348 | struct flow_keys keys; | |
2349 | ||
2350 | /* short-circuit if we already have L4 hash present */ | |
2351 | if (skb->l4_hash) | |
2352 | return skb_get_hash_raw(skb) >> 1; | |
2353 | ||
2354 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2355 | ||
2356 | if (!flkeys) { | |
2357 | skb_flow_dissect_flow_keys(skb, &keys, flag); | |
2358 | flkeys = &keys; | |
2359 | } | |
2360 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2361 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2362 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2363 | hash_keys.ports.src = flkeys->ports.src; | |
2364 | hash_keys.ports.dst = flkeys->ports.dst; | |
2365 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2366 | } else { | |
2367 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2368 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2369 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2370 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2371 | hash_keys.ports.src = fl6->fl6_sport; | |
2372 | hash_keys.ports.dst = fl6->fl6_dport; | |
2373 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2374 | } | |
2375 | break; | |
d8f74f09 SS |
2376 | case 2: |
2377 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2378 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2379 | if (skb) { | |
2380 | struct flow_keys keys; | |
2381 | ||
2382 | if (!flkeys) { | |
2383 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
2384 | flkeys = &keys; | |
2385 | } | |
2386 | ||
2387 | /* Inner can be v4 or v6 */ | |
2388 | if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2389 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2390 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
2391 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
2392 | } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2393 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2394 | hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src; | |
2395 | hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst; | |
2396 | hash_keys.tags.flow_label = flkeys->tags.flow_label; | |
2397 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
2398 | } else { | |
2399 | /* Same as case 0 */ | |
2400 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2401 | ip6_multipath_l3_keys(skb, &hash_keys, flkeys); | |
2402 | } | |
2403 | } else { | |
2404 | /* Same as case 0 */ | |
2405 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2406 | hash_keys.addrs.v6addrs.src = fl6->saddr; | |
2407 | hash_keys.addrs.v6addrs.dst = fl6->daddr; | |
2408 | hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6); | |
2409 | hash_keys.basic.ip_proto = fl6->flowi6_proto; | |
2410 | } | |
2411 | break; | |
23aebdac | 2412 | } |
9a2a537a | 2413 | mhash = flow_hash_from_keys(&hash_keys); |
23aebdac | 2414 | |
9a2a537a | 2415 | return mhash >> 1; |
23aebdac JS |
2416 | } |
2417 | ||
67f415dd | 2418 | /* Called with rcu held */ |
c71099ac TG |
2419 | void ip6_route_input(struct sk_buff *skb) |
2420 | { | |
b71d1d42 | 2421 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 2422 | struct net *net = dev_net(skb->dev); |
67f415dd | 2423 | int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF; |
904af04d | 2424 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 2425 | struct flowi6 fl6 = { |
e0d56fdd | 2426 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
2427 | .daddr = iph->daddr, |
2428 | .saddr = iph->saddr, | |
6502ca52 | 2429 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
2430 | .flowi6_mark = skb->mark, |
2431 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 2432 | }; |
5e5d6fed | 2433 | struct flow_keys *flkeys = NULL, _flkeys; |
adaa70bb | 2434 | |
904af04d | 2435 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2436 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 2437 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
5e5d6fed RP |
2438 | |
2439 | if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys)) | |
2440 | flkeys = &_flkeys; | |
2441 | ||
23aebdac | 2442 | if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6)) |
b4bac172 | 2443 | fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys); |
06e9d040 | 2444 | skb_dst_drop(skb); |
67f415dd WW |
2445 | skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev, |
2446 | &fl6, skb, flags)); | |
c71099ac TG |
2447 | } |
2448 | ||
b75cc8f9 DA |
2449 | static struct rt6_info *ip6_pol_route_output(struct net *net, |
2450 | struct fib6_table *table, | |
2451 | struct flowi6 *fl6, | |
2452 | const struct sk_buff *skb, | |
2453 | int flags) | |
1da177e4 | 2454 | { |
b75cc8f9 | 2455 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags); |
c71099ac TG |
2456 | } |
2457 | ||
7d9e5f42 WW |
2458 | struct dst_entry *ip6_route_output_flags_noref(struct net *net, |
2459 | const struct sock *sk, | |
2460 | struct flowi6 *fl6, int flags) | |
c71099ac | 2461 | { |
d46a9d67 | 2462 | bool any_src; |
c71099ac | 2463 | |
3ede0bbc RS |
2464 | if (ipv6_addr_type(&fl6->daddr) & |
2465 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) { | |
4c1feac5 DA |
2466 | struct dst_entry *dst; |
2467 | ||
7d9e5f42 | 2468 | /* This function does not take refcnt on the dst */ |
4c1feac5 DA |
2469 | dst = l3mdev_link_scope_lookup(net, fl6); |
2470 | if (dst) | |
2471 | return dst; | |
2472 | } | |
ca254490 | 2473 | |
1fb9489b | 2474 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 2475 | |
7d9e5f42 | 2476 | flags |= RT6_LOOKUP_F_DST_NOREF; |
d46a9d67 | 2477 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 2478 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 2479 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 2480 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 2481 | |
d46a9d67 | 2482 | if (!any_src) |
adaa70bb | 2483 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
2484 | else if (sk) |
2485 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 2486 | |
b75cc8f9 | 2487 | return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output); |
1da177e4 | 2488 | } |
7d9e5f42 WW |
2489 | EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref); |
2490 | ||
2491 | struct dst_entry *ip6_route_output_flags(struct net *net, | |
2492 | const struct sock *sk, | |
2493 | struct flowi6 *fl6, | |
2494 | int flags) | |
2495 | { | |
2496 | struct dst_entry *dst; | |
2497 | struct rt6_info *rt6; | |
2498 | ||
2499 | rcu_read_lock(); | |
2500 | dst = ip6_route_output_flags_noref(net, sk, fl6, flags); | |
2501 | rt6 = (struct rt6_info *)dst; | |
2502 | /* For dst cached in uncached_list, refcnt is already taken. */ | |
2503 | if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) { | |
2504 | dst = &net->ipv6.ip6_null_entry->dst; | |
2505 | dst_hold(dst); | |
2506 | } | |
2507 | rcu_read_unlock(); | |
2508 | ||
2509 | return dst; | |
2510 | } | |
6f21c96a | 2511 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 2512 | |
2774c131 | 2513 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2514 | { |
5c1e6aa3 | 2515 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
1dbe3252 | 2516 | struct net_device *loopback_dev = net->loopback_dev; |
14e50e57 DM |
2517 | struct dst_entry *new = NULL; |
2518 | ||
1dbe3252 | 2519 | rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1, |
62cf27e5 | 2520 | DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2521 | if (rt) { |
0a1f5962 | 2522 | rt6_info_init(rt); |
81eb8447 | 2523 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc); |
8104891b | 2524 | |
0a1f5962 | 2525 | new = &rt->dst; |
14e50e57 | 2526 | new->__use = 1; |
352e512c | 2527 | new->input = dst_discard; |
ede2059d | 2528 | new->output = dst_discard_out; |
14e50e57 | 2529 | |
0a1f5962 | 2530 | dst_copy_metrics(new, &ort->dst); |
14e50e57 | 2531 | |
1dbe3252 | 2532 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
4e3fd7a0 | 2533 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 2534 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
2535 | |
2536 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
2537 | #ifdef CONFIG_IPV6_SUBTREES | |
2538 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
2539 | #endif | |
14e50e57 DM |
2540 | } |
2541 | ||
69ead7af DM |
2542 | dst_release(dst_orig); |
2543 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 2544 | } |
14e50e57 | 2545 | |
1da177e4 LT |
2546 | /* |
2547 | * Destination cache support functions | |
2548 | */ | |
2549 | ||
8d1c802b | 2550 | static bool fib6_check(struct fib6_info *f6i, u32 cookie) |
4b32b5ad | 2551 | { |
93531c67 DA |
2552 | u32 rt_cookie = 0; |
2553 | ||
8ae86971 | 2554 | if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie) |
93531c67 DA |
2555 | return false; |
2556 | ||
2557 | if (fib6_check_expired(f6i)) | |
2558 | return false; | |
2559 | ||
2560 | return true; | |
4b32b5ad MKL |
2561 | } |
2562 | ||
a68886a6 DA |
2563 | static struct dst_entry *rt6_check(struct rt6_info *rt, |
2564 | struct fib6_info *from, | |
2565 | u32 cookie) | |
3da59bd9 | 2566 | { |
36143645 | 2567 | u32 rt_cookie = 0; |
c5cff856 | 2568 | |
49d05fe2 | 2569 | if (!from || !fib6_get_cookie_safe(from, &rt_cookie) || |
93531c67 | 2570 | rt_cookie != cookie) |
3da59bd9 MKL |
2571 | return NULL; |
2572 | ||
2573 | if (rt6_check_expired(rt)) | |
2574 | return NULL; | |
2575 | ||
2576 | return &rt->dst; | |
2577 | } | |
2578 | ||
a68886a6 DA |
2579 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, |
2580 | struct fib6_info *from, | |
2581 | u32 cookie) | |
3da59bd9 | 2582 | { |
5973fb1e MKL |
2583 | if (!__rt6_check_expired(rt) && |
2584 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
a68886a6 | 2585 | fib6_check(from, cookie)) |
3da59bd9 MKL |
2586 | return &rt->dst; |
2587 | else | |
2588 | return NULL; | |
2589 | } | |
2590 | ||
1da177e4 LT |
2591 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
2592 | { | |
a87b7dc9 | 2593 | struct dst_entry *dst_ret; |
a68886a6 | 2594 | struct fib6_info *from; |
1da177e4 LT |
2595 | struct rt6_info *rt; |
2596 | ||
a87b7dc9 DA |
2597 | rt = container_of(dst, struct rt6_info, dst); |
2598 | ||
2599 | rcu_read_lock(); | |
1da177e4 | 2600 | |
6f3118b5 ND |
2601 | /* All IPV6 dsts are created with ->obsolete set to the value |
2602 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
2603 | * into this function always. | |
2604 | */ | |
e3bc10bd | 2605 | |
a68886a6 | 2606 | from = rcu_dereference(rt->from); |
4b32b5ad | 2607 | |
a68886a6 DA |
2608 | if (from && (rt->rt6i_flags & RTF_PCPU || |
2609 | unlikely(!list_empty(&rt->rt6i_uncached)))) | |
2610 | dst_ret = rt6_dst_from_check(rt, from, cookie); | |
3da59bd9 | 2611 | else |
a68886a6 | 2612 | dst_ret = rt6_check(rt, from, cookie); |
a87b7dc9 DA |
2613 | |
2614 | rcu_read_unlock(); | |
2615 | ||
2616 | return dst_ret; | |
1da177e4 LT |
2617 | } |
2618 | ||
2619 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
2620 | { | |
2621 | struct rt6_info *rt = (struct rt6_info *) dst; | |
2622 | ||
2623 | if (rt) { | |
54c1a859 | 2624 | if (rt->rt6i_flags & RTF_CACHE) { |
c3c14da0 | 2625 | rcu_read_lock(); |
54c1a859 | 2626 | if (rt6_check_expired(rt)) { |
93531c67 | 2627 | rt6_remove_exception_rt(rt); |
54c1a859 YH |
2628 | dst = NULL; |
2629 | } | |
c3c14da0 | 2630 | rcu_read_unlock(); |
54c1a859 | 2631 | } else { |
1da177e4 | 2632 | dst_release(dst); |
54c1a859 YH |
2633 | dst = NULL; |
2634 | } | |
1da177e4 | 2635 | } |
54c1a859 | 2636 | return dst; |
1da177e4 LT |
2637 | } |
2638 | ||
2639 | static void ip6_link_failure(struct sk_buff *skb) | |
2640 | { | |
2641 | struct rt6_info *rt; | |
2642 | ||
3ffe533c | 2643 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 2644 | |
adf30907 | 2645 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 2646 | if (rt) { |
8a14e46f | 2647 | rcu_read_lock(); |
1eb4f758 | 2648 | if (rt->rt6i_flags & RTF_CACHE) { |
761f6026 | 2649 | rt6_remove_exception_rt(rt); |
c5cff856 | 2650 | } else { |
a68886a6 | 2651 | struct fib6_info *from; |
c5cff856 WW |
2652 | struct fib6_node *fn; |
2653 | ||
a68886a6 DA |
2654 | from = rcu_dereference(rt->from); |
2655 | if (from) { | |
2656 | fn = rcu_dereference(from->fib6_node); | |
2657 | if (fn && (rt->rt6i_flags & RTF_DEFAULT)) | |
2658 | fn->fn_sernum = -1; | |
2659 | } | |
1eb4f758 | 2660 | } |
8a14e46f | 2661 | rcu_read_unlock(); |
1da177e4 LT |
2662 | } |
2663 | } | |
2664 | ||
6a3e030f DA |
2665 | static void rt6_update_expires(struct rt6_info *rt0, int timeout) |
2666 | { | |
a68886a6 DA |
2667 | if (!(rt0->rt6i_flags & RTF_EXPIRES)) { |
2668 | struct fib6_info *from; | |
2669 | ||
2670 | rcu_read_lock(); | |
2671 | from = rcu_dereference(rt0->from); | |
2672 | if (from) | |
2673 | rt0->dst.expires = from->expires; | |
2674 | rcu_read_unlock(); | |
2675 | } | |
6a3e030f DA |
2676 | |
2677 | dst_set_expires(&rt0->dst, timeout); | |
2678 | rt0->rt6i_flags |= RTF_EXPIRES; | |
2679 | } | |
2680 | ||
45e4fd26 MKL |
2681 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
2682 | { | |
2683 | struct net *net = dev_net(rt->dst.dev); | |
2684 | ||
d4ead6b3 | 2685 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
45e4fd26 | 2686 | rt->rt6i_flags |= RTF_MODIFIED; |
45e4fd26 MKL |
2687 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
2688 | } | |
2689 | ||
0d3f6d29 MKL |
2690 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
2691 | { | |
2692 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1490ed2a | 2693 | (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from)); |
0d3f6d29 MKL |
2694 | } |
2695 | ||
45e4fd26 | 2696 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
bd085ef6 HL |
2697 | const struct ipv6hdr *iph, u32 mtu, |
2698 | bool confirm_neigh) | |
1da177e4 | 2699 | { |
0dec879f | 2700 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 2701 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 2702 | |
19bda36c XL |
2703 | if (dst_metric_locked(dst, RTAX_MTU)) |
2704 | return; | |
2705 | ||
0dec879f JA |
2706 | if (iph) { |
2707 | daddr = &iph->daddr; | |
2708 | saddr = &iph->saddr; | |
2709 | } else if (sk) { | |
2710 | daddr = &sk->sk_v6_daddr; | |
2711 | saddr = &inet6_sk(sk)->saddr; | |
2712 | } else { | |
2713 | daddr = NULL; | |
2714 | saddr = NULL; | |
2715 | } | |
bd085ef6 HL |
2716 | |
2717 | if (confirm_neigh) | |
2718 | dst_confirm_neigh(dst, daddr); | |
2719 | ||
45e4fd26 MKL |
2720 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); |
2721 | if (mtu >= dst_mtu(dst)) | |
2722 | return; | |
9d289715 | 2723 | |
0d3f6d29 | 2724 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 2725 | rt6_do_update_pmtu(rt6, mtu); |
2b760fcf WW |
2726 | /* update rt6_ex->stamp for cache */ |
2727 | if (rt6->rt6i_flags & RTF_CACHE) | |
2728 | rt6_update_exception_stamp_rt(rt6); | |
0dec879f | 2729 | } else if (daddr) { |
85bd05de | 2730 | struct fib6_result res = {}; |
45e4fd26 MKL |
2731 | struct rt6_info *nrt6; |
2732 | ||
4d85cd0c | 2733 | rcu_read_lock(); |
85bd05de | 2734 | res.f6i = rcu_dereference(rt6->from); |
43a4b60d DA |
2735 | if (!res.f6i) |
2736 | goto out_unlock; | |
2737 | ||
7d21fec9 DA |
2738 | res.fib6_flags = res.f6i->fib6_flags; |
2739 | res.fib6_type = res.f6i->fib6_type; | |
2740 | ||
2d44234b DA |
2741 | if (res.f6i->nh) { |
2742 | struct fib6_nh_match_arg arg = { | |
2743 | .dev = dst->dev, | |
2744 | .gw = &rt6->rt6i_gateway, | |
2745 | }; | |
2746 | ||
2747 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
2748 | fib6_nh_find_match, &arg); | |
2749 | ||
2750 | /* fib6_info uses a nexthop that does not have fib6_nh | |
2751 | * using the dst->dev + gw. Should be impossible. | |
2752 | */ | |
43a4b60d DA |
2753 | if (!arg.match) |
2754 | goto out_unlock; | |
2d44234b DA |
2755 | |
2756 | res.nh = arg.match; | |
2757 | } else { | |
2758 | res.nh = res.f6i->fib6_nh; | |
2759 | } | |
2760 | ||
85bd05de | 2761 | nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr); |
45e4fd26 MKL |
2762 | if (nrt6) { |
2763 | rt6_do_update_pmtu(nrt6, mtu); | |
5012f0a5 | 2764 | if (rt6_insert_exception(nrt6, &res)) |
2b760fcf | 2765 | dst_release_immediate(&nrt6->dst); |
45e4fd26 | 2766 | } |
43a4b60d | 2767 | out_unlock: |
a68886a6 | 2768 | rcu_read_unlock(); |
1da177e4 LT |
2769 | } |
2770 | } | |
2771 | ||
45e4fd26 | 2772 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
2773 | struct sk_buff *skb, u32 mtu, |
2774 | bool confirm_neigh) | |
45e4fd26 | 2775 | { |
bd085ef6 HL |
2776 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu, |
2777 | confirm_neigh); | |
45e4fd26 MKL |
2778 | } |
2779 | ||
42ae66c8 | 2780 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 2781 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
2782 | { |
2783 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2784 | struct dst_entry *dst; | |
dc92095d MŻ |
2785 | struct flowi6 fl6 = { |
2786 | .flowi6_oif = oif, | |
2787 | .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark), | |
2788 | .daddr = iph->daddr, | |
2789 | .saddr = iph->saddr, | |
2790 | .flowlabel = ip6_flowinfo(iph), | |
2791 | .flowi6_uid = uid, | |
2792 | }; | |
81aded24 DM |
2793 | |
2794 | dst = ip6_route_output(net, NULL, &fl6); | |
2795 | if (!dst->error) | |
bd085ef6 | 2796 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true); |
81aded24 DM |
2797 | dst_release(dst); |
2798 | } | |
2799 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
2800 | ||
2801 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
2802 | { | |
7ddacfa5 | 2803 | int oif = sk->sk_bound_dev_if; |
33c162a9 MKL |
2804 | struct dst_entry *dst; |
2805 | ||
7ddacfa5 DA |
2806 | if (!oif && skb->dev) |
2807 | oif = l3mdev_master_ifindex(skb->dev); | |
2808 | ||
2809 | ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid); | |
33c162a9 MKL |
2810 | |
2811 | dst = __sk_dst_get(sk); | |
2812 | if (!dst || !dst->obsolete || | |
2813 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
2814 | return; | |
2815 | ||
2816 | bh_lock_sock(sk); | |
2817 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
2818 | ip6_datagram_dst_update(sk, false); | |
2819 | bh_unlock_sock(sk); | |
81aded24 DM |
2820 | } |
2821 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
2822 | ||
7d6850f7 AK |
2823 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
2824 | const struct flowi6 *fl6) | |
2825 | { | |
2826 | #ifdef CONFIG_IPV6_SUBTREES | |
2827 | struct ipv6_pinfo *np = inet6_sk(sk); | |
2828 | #endif | |
2829 | ||
2830 | ip6_dst_store(sk, dst, | |
2831 | ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ? | |
2832 | &sk->sk_v6_daddr : NULL, | |
2833 | #ifdef CONFIG_IPV6_SUBTREES | |
2834 | ipv6_addr_equal(&fl6->saddr, &np->saddr) ? | |
2835 | &np->saddr : | |
2836 | #endif | |
2837 | NULL); | |
2838 | } | |
2839 | ||
9b6b35ab | 2840 | static bool ip6_redirect_nh_match(const struct fib6_result *res, |
0b34eb00 DA |
2841 | struct flowi6 *fl6, |
2842 | const struct in6_addr *gw, | |
2843 | struct rt6_info **ret) | |
2844 | { | |
9b6b35ab DA |
2845 | const struct fib6_nh *nh = res->nh; |
2846 | ||
0b34eb00 DA |
2847 | if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family || |
2848 | fl6->flowi6_oif != nh->fib_nh_dev->ifindex) | |
2849 | return false; | |
2850 | ||
2851 | /* rt_cache's gateway might be different from its 'parent' | |
2852 | * in the case of an ip redirect. | |
2853 | * So we keep searching in the exception table if the gateway | |
2854 | * is different. | |
2855 | */ | |
2856 | if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) { | |
2857 | struct rt6_info *rt_cache; | |
2858 | ||
9b6b35ab | 2859 | rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr); |
0b34eb00 DA |
2860 | if (rt_cache && |
2861 | ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) { | |
2862 | *ret = rt_cache; | |
2863 | return true; | |
2864 | } | |
2865 | return false; | |
2866 | } | |
2867 | return true; | |
2868 | } | |
2869 | ||
c55c8988 DA |
2870 | struct fib6_nh_rd_arg { |
2871 | struct fib6_result *res; | |
2872 | struct flowi6 *fl6; | |
2873 | const struct in6_addr *gw; | |
2874 | struct rt6_info **ret; | |
2875 | }; | |
2876 | ||
2877 | static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg) | |
2878 | { | |
2879 | struct fib6_nh_rd_arg *arg = _arg; | |
2880 | ||
2881 | arg->res->nh = nh; | |
2882 | return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret); | |
2883 | } | |
2884 | ||
b55b76b2 DJ |
2885 | /* Handle redirects */ |
2886 | struct ip6rd_flowi { | |
2887 | struct flowi6 fl6; | |
2888 | struct in6_addr gateway; | |
2889 | }; | |
2890 | ||
2891 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
2892 | struct fib6_table *table, | |
2893 | struct flowi6 *fl6, | |
b75cc8f9 | 2894 | const struct sk_buff *skb, |
b55b76b2 DJ |
2895 | int flags) |
2896 | { | |
2897 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
0b34eb00 | 2898 | struct rt6_info *ret = NULL; |
9b6b35ab | 2899 | struct fib6_result res = {}; |
c55c8988 DA |
2900 | struct fib6_nh_rd_arg arg = { |
2901 | .res = &res, | |
2902 | .fl6 = fl6, | |
2903 | .gw = &rdfl->gateway, | |
2904 | .ret = &ret | |
2905 | }; | |
8d1c802b | 2906 | struct fib6_info *rt; |
b55b76b2 DJ |
2907 | struct fib6_node *fn; |
2908 | ||
31680ac2 DA |
2909 | /* l3mdev_update_flow overrides oif if the device is enslaved; in |
2910 | * this case we must match on the real ingress device, so reset it | |
2911 | */ | |
2912 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) | |
2913 | fl6->flowi6_oif = skb->dev->ifindex; | |
2914 | ||
b55b76b2 | 2915 | /* Get the "current" route for this destination and |
67c408cf | 2916 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
2917 | * |
2918 | * RFC 4861 specifies that redirects should only be | |
2919 | * accepted if they come from the nexthop to the target. | |
2920 | * Due to the way the routes are chosen, this notion | |
2921 | * is a bit fuzzy and one might need to check all possible | |
2922 | * routes. | |
2923 | */ | |
2924 | ||
66f5d6ce | 2925 | rcu_read_lock(); |
6454743b | 2926 | fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
b55b76b2 | 2927 | restart: |
66f5d6ce | 2928 | for_each_fib6_node_rt_rcu(fn) { |
9b6b35ab | 2929 | res.f6i = rt; |
14895687 | 2930 | if (fib6_check_expired(rt)) |
b55b76b2 | 2931 | continue; |
93c2fb25 | 2932 | if (rt->fib6_flags & RTF_REJECT) |
b55b76b2 | 2933 | break; |
c55c8988 DA |
2934 | if (unlikely(rt->nh)) { |
2935 | if (nexthop_is_blackhole(rt->nh)) | |
2936 | continue; | |
2937 | /* on match, res->nh is filled in and potentially ret */ | |
2938 | if (nexthop_for_each_fib6_nh(rt->nh, | |
2939 | fib6_nh_redirect_match, | |
2940 | &arg)) | |
2941 | goto out; | |
2942 | } else { | |
2943 | res.nh = rt->fib6_nh; | |
2944 | if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, | |
2945 | &ret)) | |
2946 | goto out; | |
2947 | } | |
b55b76b2 DJ |
2948 | } |
2949 | ||
2950 | if (!rt) | |
421842ed | 2951 | rt = net->ipv6.fib6_null_entry; |
93c2fb25 | 2952 | else if (rt->fib6_flags & RTF_REJECT) { |
23fb93a4 | 2953 | ret = net->ipv6.ip6_null_entry; |
b0a1ba59 MKL |
2954 | goto out; |
2955 | } | |
2956 | ||
421842ed | 2957 | if (rt == net->ipv6.fib6_null_entry) { |
a3c00e46 MKL |
2958 | fn = fib6_backtrack(fn, &fl6->saddr); |
2959 | if (fn) | |
2960 | goto restart; | |
b55b76b2 | 2961 | } |
a3c00e46 | 2962 | |
9b6b35ab | 2963 | res.f6i = rt; |
1cf844c7 | 2964 | res.nh = rt->fib6_nh; |
b0a1ba59 | 2965 | out: |
7d21fec9 | 2966 | if (ret) { |
10585b43 | 2967 | ip6_hold_safe(net, &ret); |
7d21fec9 DA |
2968 | } else { |
2969 | res.fib6_flags = res.f6i->fib6_flags; | |
2970 | res.fib6_type = res.f6i->fib6_type; | |
9b6b35ab | 2971 | ret = ip6_create_rt_rcu(&res); |
7d21fec9 | 2972 | } |
b55b76b2 | 2973 | |
66f5d6ce | 2974 | rcu_read_unlock(); |
b55b76b2 | 2975 | |
8ff2e5b2 | 2976 | trace_fib6_table_lookup(net, &res, table, fl6); |
23fb93a4 | 2977 | return ret; |
b55b76b2 DJ |
2978 | }; |
2979 | ||
2980 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
b75cc8f9 DA |
2981 | const struct flowi6 *fl6, |
2982 | const struct sk_buff *skb, | |
2983 | const struct in6_addr *gateway) | |
b55b76b2 DJ |
2984 | { |
2985 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
2986 | struct ip6rd_flowi rdfl; | |
2987 | ||
2988 | rdfl.fl6 = *fl6; | |
2989 | rdfl.gateway = *gateway; | |
2990 | ||
b75cc8f9 | 2991 | return fib6_rule_lookup(net, &rdfl.fl6, skb, |
b55b76b2 DJ |
2992 | flags, __ip6_route_redirect); |
2993 | } | |
2994 | ||
e2d118a1 LC |
2995 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
2996 | kuid_t uid) | |
3a5ad2ee DM |
2997 | { |
2998 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
2999 | struct dst_entry *dst; | |
1f7f10ac MŻ |
3000 | struct flowi6 fl6 = { |
3001 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3002 | .flowi6_oif = oif, | |
3003 | .flowi6_mark = mark, | |
3004 | .daddr = iph->daddr, | |
3005 | .saddr = iph->saddr, | |
3006 | .flowlabel = ip6_flowinfo(iph), | |
3007 | .flowi6_uid = uid, | |
3008 | }; | |
3a5ad2ee | 3009 | |
b75cc8f9 | 3010 | dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr); |
b55b76b2 | 3011 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
3012 | dst_release(dst); |
3013 | } | |
3014 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
3015 | ||
d456336d | 3016 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif) |
c92a59ec DJ |
3017 | { |
3018 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
3019 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
3020 | struct dst_entry *dst; | |
0b26fb17 MŻ |
3021 | struct flowi6 fl6 = { |
3022 | .flowi6_iif = LOOPBACK_IFINDEX, | |
3023 | .flowi6_oif = oif, | |
0b26fb17 MŻ |
3024 | .daddr = msg->dest, |
3025 | .saddr = iph->daddr, | |
3026 | .flowi6_uid = sock_net_uid(net, NULL), | |
3027 | }; | |
c92a59ec | 3028 | |
b75cc8f9 | 3029 | dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr); |
b55b76b2 | 3030 | rt6_do_redirect(dst, NULL, skb); |
c92a59ec DJ |
3031 | dst_release(dst); |
3032 | } | |
3033 | ||
3a5ad2ee DM |
3034 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
3035 | { | |
e2d118a1 LC |
3036 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
3037 | sk->sk_uid); | |
3a5ad2ee DM |
3038 | } |
3039 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
3040 | ||
0dbaee3b | 3041 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 3042 | { |
0dbaee3b DM |
3043 | struct net_device *dev = dst->dev; |
3044 | unsigned int mtu = dst_mtu(dst); | |
3045 | struct net *net = dev_net(dev); | |
3046 | ||
1da177e4 LT |
3047 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
3048 | ||
5578689a DL |
3049 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
3050 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
3051 | |
3052 | /* | |
1ab1457c YH |
3053 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
3054 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
3055 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
3056 | * rely only on pmtu discovery" |
3057 | */ | |
3058 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
3059 | mtu = IPV6_MAXPLEN; | |
3060 | return mtu; | |
3061 | } | |
3062 | ||
ebb762f2 | 3063 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 3064 | { |
d33e4553 | 3065 | struct inet6_dev *idev; |
d4ead6b3 | 3066 | unsigned int mtu; |
4b32b5ad MKL |
3067 | |
3068 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 3069 | if (mtu) |
30f78d8e | 3070 | goto out; |
618f9bc7 SK |
3071 | |
3072 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
3073 | |
3074 | rcu_read_lock(); | |
3075 | idev = __in6_dev_get(dst->dev); | |
3076 | if (idev) | |
3077 | mtu = idev->cnf.mtu6; | |
3078 | rcu_read_unlock(); | |
3079 | ||
30f78d8e | 3080 | out: |
14972cbd RP |
3081 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
3082 | ||
3083 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
3084 | } |
3085 | ||
901731b8 DA |
3086 | /* MTU selection: |
3087 | * 1. mtu on route is locked - use it | |
3088 | * 2. mtu from nexthop exception | |
3089 | * 3. mtu from egress device | |
3090 | * | |
3091 | * based on ip6_dst_mtu_forward and exception logic of | |
3092 | * rt6_find_cached_rt; called with rcu_read_lock | |
3093 | */ | |
b748f260 DA |
3094 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
3095 | const struct in6_addr *daddr, | |
3096 | const struct in6_addr *saddr) | |
901731b8 | 3097 | { |
b748f260 DA |
3098 | const struct fib6_nh *nh = res->nh; |
3099 | struct fib6_info *f6i = res->f6i; | |
901731b8 | 3100 | struct inet6_dev *idev; |
510e2ced | 3101 | struct rt6_info *rt; |
901731b8 DA |
3102 | u32 mtu = 0; |
3103 | ||
3104 | if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) { | |
3105 | mtu = f6i->fib6_pmtu; | |
3106 | if (mtu) | |
3107 | goto out; | |
3108 | } | |
3109 | ||
510e2ced WW |
3110 | rt = rt6_find_cached_rt(res, daddr, saddr); |
3111 | if (unlikely(rt)) { | |
3112 | mtu = dst_metric_raw(&rt->dst, RTAX_MTU); | |
3113 | } else { | |
b748f260 | 3114 | struct net_device *dev = nh->fib_nh_dev; |
901731b8 DA |
3115 | |
3116 | mtu = IPV6_MIN_MTU; | |
3117 | idev = __in6_dev_get(dev); | |
3118 | if (idev && idev->cnf.mtu6 > mtu) | |
3119 | mtu = idev->cnf.mtu6; | |
3120 | } | |
3121 | ||
3122 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); | |
3123 | out: | |
b748f260 | 3124 | return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu); |
901731b8 DA |
3125 | } |
3126 | ||
3b00944c | 3127 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 3128 | struct flowi6 *fl6) |
1da177e4 | 3129 | { |
87a11578 | 3130 | struct dst_entry *dst; |
1da177e4 LT |
3131 | struct rt6_info *rt; |
3132 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 3133 | struct net *net = dev_net(dev); |
1da177e4 | 3134 | |
38308473 | 3135 | if (unlikely(!idev)) |
122bdf67 | 3136 | return ERR_PTR(-ENODEV); |
1da177e4 | 3137 | |
ad706862 | 3138 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 3139 | if (unlikely(!rt)) { |
1da177e4 | 3140 | in6_dev_put(idev); |
87a11578 | 3141 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
3142 | goto out; |
3143 | } | |
3144 | ||
8e2ec639 | 3145 | rt->dst.flags |= DST_HOST; |
588753f1 | 3146 | rt->dst.input = ip6_input; |
8e2ec639 | 3147 | rt->dst.output = ip6_output; |
550bab42 | 3148 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 3149 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
3150 | rt->rt6i_dst.plen = 128; |
3151 | rt->rt6i_idev = idev; | |
14edd87d | 3152 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 3153 | |
4c981e28 | 3154 | /* Add this dst into uncached_list so that rt6_disable_ip() can |
587fea74 WW |
3155 | * do proper release of the net_device |
3156 | */ | |
3157 | rt6_uncached_list_add(rt); | |
81eb8447 | 3158 | atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache); |
1da177e4 | 3159 | |
87a11578 DM |
3160 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
3161 | ||
1da177e4 | 3162 | out: |
87a11578 | 3163 | return dst; |
1da177e4 LT |
3164 | } |
3165 | ||
569d3645 | 3166 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 3167 | { |
86393e52 | 3168 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
3169 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
3170 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
3171 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3172 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3173 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 3174 | int entries; |
7019b78e | 3175 | |
fc66f95c | 3176 | entries = dst_entries_get_fast(ops); |
49a18d86 | 3177 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 3178 | entries <= rt_max_size) |
1da177e4 LT |
3179 | goto out; |
3180 | ||
6891a346 | 3181 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 3182 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
3183 | entries = dst_entries_get_slow(ops); |
3184 | if (entries < ops->gc_thresh) | |
7019b78e | 3185 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 3186 | out: |
7019b78e | 3187 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 3188 | return entries > rt_max_size; |
1da177e4 LT |
3189 | } |
3190 | ||
b2c709cc DA |
3191 | static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg, |
3192 | const struct in6_addr *gw_addr, u32 tbid, | |
3193 | int flags, struct fib6_result *res) | |
8c14586f DA |
3194 | { |
3195 | struct flowi6 fl6 = { | |
3196 | .flowi6_oif = cfg->fc_ifindex, | |
3197 | .daddr = *gw_addr, | |
3198 | .saddr = cfg->fc_prefsrc, | |
3199 | }; | |
3200 | struct fib6_table *table; | |
b2c709cc | 3201 | int err; |
8c14586f | 3202 | |
f4797b33 | 3203 | table = fib6_get_table(net, tbid); |
8c14586f | 3204 | if (!table) |
b2c709cc | 3205 | return -EINVAL; |
8c14586f DA |
3206 | |
3207 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
3208 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3209 | ||
f4797b33 | 3210 | flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f | 3211 | |
b2c709cc DA |
3212 | err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags); |
3213 | if (!err && res->f6i != net->ipv6.fib6_null_entry) | |
3214 | fib6_select_path(net, res, &fl6, cfg->fc_ifindex, | |
3215 | cfg->fc_ifindex != 0, NULL, flags); | |
8c14586f | 3216 | |
b2c709cc | 3217 | return err; |
8c14586f DA |
3218 | } |
3219 | ||
fc1e64e1 DA |
3220 | static int ip6_route_check_nh_onlink(struct net *net, |
3221 | struct fib6_config *cfg, | |
9fbb704c | 3222 | const struct net_device *dev, |
fc1e64e1 DA |
3223 | struct netlink_ext_ack *extack) |
3224 | { | |
b2c709cc | 3225 | u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; |
fc1e64e1 | 3226 | const struct in6_addr *gw_addr = &cfg->fc_gateway; |
b2c709cc | 3227 | struct fib6_result res = {}; |
fc1e64e1 DA |
3228 | int err; |
3229 | ||
b2c709cc DA |
3230 | err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res); |
3231 | if (!err && !(res.fib6_flags & RTF_REJECT) && | |
3232 | /* ignore match if it is the default route */ | |
3233 | !ipv6_addr_any(&res.f6i->fib6_dst.addr) && | |
3234 | (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) { | |
3235 | NL_SET_ERR_MSG(extack, | |
3236 | "Nexthop has invalid gateway or device mismatch"); | |
3237 | err = -EINVAL; | |
fc1e64e1 DA |
3238 | } |
3239 | ||
3240 | return err; | |
3241 | } | |
3242 | ||
1edce99f DA |
3243 | static int ip6_route_check_nh(struct net *net, |
3244 | struct fib6_config *cfg, | |
3245 | struct net_device **_dev, | |
3246 | struct inet6_dev **idev) | |
3247 | { | |
3248 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3249 | struct net_device *dev = _dev ? *_dev : NULL; | |
b2c709cc DA |
3250 | int flags = RT6_LOOKUP_F_IFACE; |
3251 | struct fib6_result res = {}; | |
1edce99f DA |
3252 | int err = -EHOSTUNREACH; |
3253 | ||
3254 | if (cfg->fc_table) { | |
b2c709cc DA |
3255 | err = ip6_nh_lookup_table(net, cfg, gw_addr, |
3256 | cfg->fc_table, flags, &res); | |
3257 | /* gw_addr can not require a gateway or resolve to a reject | |
3258 | * route. If a device is given, it must match the result. | |
3259 | */ | |
3260 | if (err || res.fib6_flags & RTF_REJECT || | |
3261 | res.nh->fib_nh_gw_family || | |
3262 | (dev && dev != res.nh->fib_nh_dev)) | |
3263 | err = -EHOSTUNREACH; | |
1edce99f DA |
3264 | } |
3265 | ||
b2c709cc DA |
3266 | if (err < 0) { |
3267 | struct flowi6 fl6 = { | |
3268 | .flowi6_oif = cfg->fc_ifindex, | |
3269 | .daddr = *gw_addr, | |
3270 | }; | |
1edce99f | 3271 | |
b2c709cc DA |
3272 | err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags); |
3273 | if (err || res.fib6_flags & RTF_REJECT || | |
3274 | res.nh->fib_nh_gw_family) | |
3275 | err = -EHOSTUNREACH; | |
3276 | ||
3277 | if (err) | |
3278 | return err; | |
3279 | ||
3280 | fib6_select_path(net, &res, &fl6, cfg->fc_ifindex, | |
3281 | cfg->fc_ifindex != 0, NULL, flags); | |
3282 | } | |
1edce99f | 3283 | |
b2c709cc | 3284 | err = 0; |
1edce99f | 3285 | if (dev) { |
b2c709cc DA |
3286 | if (dev != res.nh->fib_nh_dev) |
3287 | err = -EHOSTUNREACH; | |
1edce99f | 3288 | } else { |
b2c709cc | 3289 | *_dev = dev = res.nh->fib_nh_dev; |
1edce99f | 3290 | dev_hold(dev); |
b2c709cc | 3291 | *idev = in6_dev_get(dev); |
1edce99f DA |
3292 | } |
3293 | ||
1edce99f DA |
3294 | return err; |
3295 | } | |
3296 | ||
9fbb704c DA |
3297 | static int ip6_validate_gw(struct net *net, struct fib6_config *cfg, |
3298 | struct net_device **_dev, struct inet6_dev **idev, | |
3299 | struct netlink_ext_ack *extack) | |
3300 | { | |
3301 | const struct in6_addr *gw_addr = &cfg->fc_gateway; | |
3302 | int gwa_type = ipv6_addr_type(gw_addr); | |
232378e8 | 3303 | bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true; |
9fbb704c | 3304 | const struct net_device *dev = *_dev; |
232378e8 | 3305 | bool need_addr_check = !dev; |
9fbb704c DA |
3306 | int err = -EINVAL; |
3307 | ||
3308 | /* if gw_addr is local we will fail to detect this in case | |
3309 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
3310 | * will return already-added prefix route via interface that | |
3311 | * prefix route was assigned to, which might be non-loopback. | |
3312 | */ | |
232378e8 DA |
3313 | if (dev && |
3314 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3315 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
9fbb704c DA |
3316 | goto out; |
3317 | } | |
3318 | ||
3319 | if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) { | |
3320 | /* IPv6 strictly inhibits using not link-local | |
3321 | * addresses as nexthop address. | |
3322 | * Otherwise, router will not able to send redirects. | |
3323 | * It is very good, but in some (rare!) circumstances | |
3324 | * (SIT, PtP, NBMA NOARP links) it is handy to allow | |
3325 | * some exceptions. --ANK | |
3326 | * We allow IPv4-mapped nexthops to support RFC4798-type | |
3327 | * addressing | |
3328 | */ | |
3329 | if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) { | |
3330 | NL_SET_ERR_MSG(extack, "Invalid gateway address"); | |
3331 | goto out; | |
3332 | } | |
3333 | ||
b2c709cc DA |
3334 | rcu_read_lock(); |
3335 | ||
9fbb704c DA |
3336 | if (cfg->fc_flags & RTNH_F_ONLINK) |
3337 | err = ip6_route_check_nh_onlink(net, cfg, dev, extack); | |
3338 | else | |
3339 | err = ip6_route_check_nh(net, cfg, _dev, idev); | |
3340 | ||
b2c709cc DA |
3341 | rcu_read_unlock(); |
3342 | ||
9fbb704c DA |
3343 | if (err) |
3344 | goto out; | |
3345 | } | |
3346 | ||
3347 | /* reload in case device was changed */ | |
3348 | dev = *_dev; | |
3349 | ||
3350 | err = -EINVAL; | |
3351 | if (!dev) { | |
3352 | NL_SET_ERR_MSG(extack, "Egress device not specified"); | |
3353 | goto out; | |
3354 | } else if (dev->flags & IFF_LOOPBACK) { | |
3355 | NL_SET_ERR_MSG(extack, | |
3356 | "Egress device can not be loopback device for this route"); | |
3357 | goto out; | |
3358 | } | |
232378e8 DA |
3359 | |
3360 | /* if we did not check gw_addr above, do so now that the | |
3361 | * egress device has been resolved. | |
3362 | */ | |
3363 | if (need_addr_check && | |
3364 | ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) { | |
3365 | NL_SET_ERR_MSG(extack, "Gateway can not be a local address"); | |
3366 | goto out; | |
3367 | } | |
3368 | ||
9fbb704c DA |
3369 | err = 0; |
3370 | out: | |
3371 | return err; | |
3372 | } | |
3373 | ||
83c44251 DA |
3374 | static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type) |
3375 | { | |
3376 | if ((flags & RTF_REJECT) || | |
3377 | (dev && (dev->flags & IFF_LOOPBACK) && | |
3378 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
3379 | !(flags & RTF_LOCAL))) | |
3380 | return true; | |
3381 | ||
3382 | return false; | |
3383 | } | |
3384 | ||
3385 | int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh, | |
3386 | struct fib6_config *cfg, gfp_t gfp_flags, | |
3387 | struct netlink_ext_ack *extack) | |
3388 | { | |
3389 | struct net_device *dev = NULL; | |
3390 | struct inet6_dev *idev = NULL; | |
3391 | int addr_type; | |
3392 | int err; | |
3393 | ||
f1741730 | 3394 | fib6_nh->fib_nh_family = AF_INET6; |
1bef4c22 ED |
3395 | #ifdef CONFIG_IPV6_ROUTER_PREF |
3396 | fib6_nh->last_probe = jiffies; | |
3397 | #endif | |
f1741730 | 3398 | |
83c44251 DA |
3399 | err = -ENODEV; |
3400 | if (cfg->fc_ifindex) { | |
3401 | dev = dev_get_by_index(net, cfg->fc_ifindex); | |
3402 | if (!dev) | |
3403 | goto out; | |
3404 | idev = in6_dev_get(dev); | |
3405 | if (!idev) | |
3406 | goto out; | |
3407 | } | |
3408 | ||
3409 | if (cfg->fc_flags & RTNH_F_ONLINK) { | |
3410 | if (!dev) { | |
3411 | NL_SET_ERR_MSG(extack, | |
3412 | "Nexthop device required for onlink"); | |
3413 | goto out; | |
3414 | } | |
3415 | ||
3416 | if (!(dev->flags & IFF_UP)) { | |
3417 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3418 | err = -ENETDOWN; | |
3419 | goto out; | |
3420 | } | |
3421 | ||
ad1601ae | 3422 | fib6_nh->fib_nh_flags |= RTNH_F_ONLINK; |
83c44251 DA |
3423 | } |
3424 | ||
ad1601ae | 3425 | fib6_nh->fib_nh_weight = 1; |
83c44251 DA |
3426 | |
3427 | /* We cannot add true routes via loopback here, | |
3428 | * they would result in kernel looping; promote them to reject routes | |
3429 | */ | |
3430 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3431 | if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) { | |
3432 | /* hold loopback dev/idev if we haven't done so. */ | |
3433 | if (dev != net->loopback_dev) { | |
3434 | if (dev) { | |
3435 | dev_put(dev); | |
3436 | in6_dev_put(idev); | |
3437 | } | |
3438 | dev = net->loopback_dev; | |
3439 | dev_hold(dev); | |
3440 | idev = in6_dev_get(dev); | |
3441 | if (!idev) { | |
3442 | err = -ENODEV; | |
3443 | goto out; | |
3444 | } | |
3445 | } | |
7dd73168 | 3446 | goto pcpu_alloc; |
83c44251 DA |
3447 | } |
3448 | ||
3449 | if (cfg->fc_flags & RTF_GATEWAY) { | |
3450 | err = ip6_validate_gw(net, cfg, &dev, &idev, extack); | |
3451 | if (err) | |
3452 | goto out; | |
3453 | ||
ad1601ae | 3454 | fib6_nh->fib_nh_gw6 = cfg->fc_gateway; |
bdf00467 | 3455 | fib6_nh->fib_nh_gw_family = AF_INET6; |
83c44251 DA |
3456 | } |
3457 | ||
3458 | err = -ENODEV; | |
3459 | if (!dev) | |
3460 | goto out; | |
3461 | ||
3462 | if (idev->cnf.disable_ipv6) { | |
3463 | NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device"); | |
3464 | err = -EACCES; | |
3465 | goto out; | |
3466 | } | |
3467 | ||
3468 | if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) { | |
3469 | NL_SET_ERR_MSG(extack, "Nexthop device is not up"); | |
3470 | err = -ENETDOWN; | |
3471 | goto out; | |
3472 | } | |
3473 | ||
3474 | if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) && | |
3475 | !netif_carrier_ok(dev)) | |
ad1601ae | 3476 | fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
83c44251 | 3477 | |
7dd73168 DA |
3478 | err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap, |
3479 | cfg->fc_encap_type, cfg, gfp_flags, extack); | |
3480 | if (err) | |
3481 | goto out; | |
3482 | ||
3483 | pcpu_alloc: | |
f40b6ae2 DA |
3484 | fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags); |
3485 | if (!fib6_nh->rt6i_pcpu) { | |
3486 | err = -ENOMEM; | |
3487 | goto out; | |
3488 | } | |
3489 | ||
ad1601ae | 3490 | fib6_nh->fib_nh_dev = dev; |
f1741730 | 3491 | fib6_nh->fib_nh_oif = dev->ifindex; |
83c44251 DA |
3492 | err = 0; |
3493 | out: | |
3494 | if (idev) | |
3495 | in6_dev_put(idev); | |
3496 | ||
3497 | if (err) { | |
ad1601ae DA |
3498 | lwtstate_put(fib6_nh->fib_nh_lws); |
3499 | fib6_nh->fib_nh_lws = NULL; | |
83c44251 DA |
3500 | if (dev) |
3501 | dev_put(dev); | |
3502 | } | |
3503 | ||
3504 | return err; | |
3505 | } | |
3506 | ||
dac7d0f2 DA |
3507 | void fib6_nh_release(struct fib6_nh *fib6_nh) |
3508 | { | |
cc5c073a DA |
3509 | struct rt6_exception_bucket *bucket; |
3510 | ||
3511 | rcu_read_lock(); | |
3512 | ||
3513 | fib6_nh_flush_exceptions(fib6_nh, NULL); | |
3514 | bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL); | |
3515 | if (bucket) { | |
3516 | rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL); | |
3517 | kfree(bucket); | |
3518 | } | |
3519 | ||
3520 | rcu_read_unlock(); | |
3521 | ||
f40b6ae2 DA |
3522 | if (fib6_nh->rt6i_pcpu) { |
3523 | int cpu; | |
3524 | ||
3525 | for_each_possible_cpu(cpu) { | |
3526 | struct rt6_info **ppcpu_rt; | |
3527 | struct rt6_info *pcpu_rt; | |
3528 | ||
3529 | ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu); | |
3530 | pcpu_rt = *ppcpu_rt; | |
3531 | if (pcpu_rt) { | |
3532 | dst_dev_put(&pcpu_rt->dst); | |
3533 | dst_release(&pcpu_rt->dst); | |
3534 | *ppcpu_rt = NULL; | |
3535 | } | |
3536 | } | |
3537 | ||
3538 | free_percpu(fib6_nh->rt6i_pcpu); | |
3539 | } | |
3540 | ||
979e276e | 3541 | fib_nh_common_release(&fib6_nh->nh_common); |
dac7d0f2 DA |
3542 | } |
3543 | ||
8d1c802b | 3544 | static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg, |
acb54e3c | 3545 | gfp_t gfp_flags, |
333c4301 | 3546 | struct netlink_ext_ack *extack) |
1da177e4 | 3547 | { |
5578689a | 3548 | struct net *net = cfg->fc_nlinfo.nl_net; |
8d1c802b | 3549 | struct fib6_info *rt = NULL; |
f88d8ea6 | 3550 | struct nexthop *nh = NULL; |
c71099ac | 3551 | struct fib6_table *table; |
f88d8ea6 | 3552 | struct fib6_nh *fib6_nh; |
8c5b83f0 | 3553 | int err = -EINVAL; |
83c44251 | 3554 | int addr_type; |
1da177e4 | 3555 | |
557c44be | 3556 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
d5d531cb DA |
3557 | if (cfg->fc_flags & RTF_PCPU) { |
3558 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU"); | |
557c44be | 3559 | goto out; |
d5d531cb | 3560 | } |
557c44be | 3561 | |
2ea2352e WW |
3562 | /* RTF_CACHE is an internal flag; can not be set by userspace */ |
3563 | if (cfg->fc_flags & RTF_CACHE) { | |
3564 | NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE"); | |
3565 | goto out; | |
3566 | } | |
3567 | ||
e8478e80 DA |
3568 | if (cfg->fc_type > RTN_MAX) { |
3569 | NL_SET_ERR_MSG(extack, "Invalid route type"); | |
3570 | goto out; | |
3571 | } | |
3572 | ||
d5d531cb DA |
3573 | if (cfg->fc_dst_len > 128) { |
3574 | NL_SET_ERR_MSG(extack, "Invalid prefix length"); | |
3575 | goto out; | |
3576 | } | |
3577 | if (cfg->fc_src_len > 128) { | |
3578 | NL_SET_ERR_MSG(extack, "Invalid source address length"); | |
8c5b83f0 | 3579 | goto out; |
d5d531cb | 3580 | } |
1da177e4 | 3581 | #ifndef CONFIG_IPV6_SUBTREES |
d5d531cb DA |
3582 | if (cfg->fc_src_len) { |
3583 | NL_SET_ERR_MSG(extack, | |
3584 | "Specifying source address requires IPV6_SUBTREES to be enabled"); | |
8c5b83f0 | 3585 | goto out; |
d5d531cb | 3586 | } |
1da177e4 | 3587 | #endif |
5b98324e DA |
3588 | if (cfg->fc_nh_id) { |
3589 | nh = nexthop_find_by_id(net, cfg->fc_nh_id); | |
3590 | if (!nh) { | |
3591 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
3592 | goto out; | |
3593 | } | |
3594 | err = fib6_check_nexthop(nh, cfg, extack); | |
3595 | if (err) | |
3596 | goto out; | |
3597 | } | |
fc1e64e1 | 3598 | |
d71314b4 | 3599 | err = -ENOBUFS; |
38308473 DM |
3600 | if (cfg->fc_nlinfo.nlh && |
3601 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 3602 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 3603 | if (!table) { |
f3213831 | 3604 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
3605 | table = fib6_new_table(net, cfg->fc_table); |
3606 | } | |
3607 | } else { | |
3608 | table = fib6_new_table(net, cfg->fc_table); | |
3609 | } | |
38308473 DM |
3610 | |
3611 | if (!table) | |
c71099ac | 3612 | goto out; |
c71099ac | 3613 | |
93531c67 | 3614 | err = -ENOMEM; |
f88d8ea6 | 3615 | rt = fib6_info_alloc(gfp_flags, !nh); |
93531c67 | 3616 | if (!rt) |
1da177e4 | 3617 | goto out; |
93531c67 | 3618 | |
d7e774f3 DA |
3619 | rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len, |
3620 | extack); | |
767a2217 DA |
3621 | if (IS_ERR(rt->fib6_metrics)) { |
3622 | err = PTR_ERR(rt->fib6_metrics); | |
fda21d46 ED |
3623 | /* Do not leave garbage there. */ |
3624 | rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics; | |
767a2217 DA |
3625 | goto out; |
3626 | } | |
3627 | ||
93531c67 DA |
3628 | if (cfg->fc_flags & RTF_ADDRCONF) |
3629 | rt->dst_nocount = true; | |
1da177e4 | 3630 | |
1716a961 | 3631 | if (cfg->fc_flags & RTF_EXPIRES) |
14895687 | 3632 | fib6_set_expires(rt, jiffies + |
1716a961 G |
3633 | clock_t_to_jiffies(cfg->fc_expires)); |
3634 | else | |
14895687 | 3635 | fib6_clean_expires(rt); |
1da177e4 | 3636 | |
86872cb5 TG |
3637 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
3638 | cfg->fc_protocol = RTPROT_BOOT; | |
93c2fb25 | 3639 | rt->fib6_protocol = cfg->fc_protocol; |
86872cb5 | 3640 | |
83c44251 DA |
3641 | rt->fib6_table = table; |
3642 | rt->fib6_metric = cfg->fc_metric; | |
c7036d97 | 3643 | rt->fib6_type = cfg->fc_type ? : RTN_UNICAST; |
2b2450ca | 3644 | rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY; |
19e42e45 | 3645 | |
93c2fb25 DA |
3646 | ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
3647 | rt->fib6_dst.plen = cfg->fc_dst_len; | |
3648 | if (rt->fib6_dst.plen == 128) | |
3b6761d1 | 3649 | rt->dst_host = true; |
e5fd387a | 3650 | |
1da177e4 | 3651 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 DA |
3652 | ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len); |
3653 | rt->fib6_src.plen = cfg->fc_src_len; | |
1da177e4 | 3654 | #endif |
f88d8ea6 DA |
3655 | if (nh) { |
3656 | if (!nexthop_get(nh)) { | |
3657 | NL_SET_ERR_MSG(extack, "Nexthop has been deleted"); | |
3658 | goto out; | |
3659 | } | |
3660 | if (rt->fib6_src.plen) { | |
4daa95af | 3661 | NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing"); |
f88d8ea6 DA |
3662 | goto out; |
3663 | } | |
3664 | rt->nh = nh; | |
3665 | fib6_nh = nexthop_fib6_nh(rt->nh); | |
3666 | } else { | |
3667 | err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack); | |
3668 | if (err) | |
3669 | goto out; | |
1da177e4 | 3670 | |
f88d8ea6 DA |
3671 | fib6_nh = rt->fib6_nh; |
3672 | ||
3673 | /* We cannot add true routes via loopback here, they would | |
3674 | * result in kernel looping; promote them to reject routes | |
3675 | */ | |
3676 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
3677 | if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev, | |
3678 | addr_type)) | |
3679 | rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP; | |
3680 | } | |
955ec4cb | 3681 | |
c3968a85 | 3682 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
f88d8ea6 | 3683 | struct net_device *dev = fib6_nh->fib_nh_dev; |
83c44251 | 3684 | |
c3968a85 | 3685 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { |
d5d531cb | 3686 | NL_SET_ERR_MSG(extack, "Invalid source address"); |
c3968a85 DW |
3687 | err = -EINVAL; |
3688 | goto out; | |
3689 | } | |
93c2fb25 DA |
3690 | rt->fib6_prefsrc.addr = cfg->fc_prefsrc; |
3691 | rt->fib6_prefsrc.plen = 128; | |
c3968a85 | 3692 | } else |
93c2fb25 | 3693 | rt->fib6_prefsrc.plen = 0; |
c3968a85 | 3694 | |
8c5b83f0 | 3695 | return rt; |
6b9ea5a6 | 3696 | out: |
93531c67 | 3697 | fib6_info_release(rt); |
8c5b83f0 | 3698 | return ERR_PTR(err); |
6b9ea5a6 RP |
3699 | } |
3700 | ||
acb54e3c | 3701 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
333c4301 | 3702 | struct netlink_ext_ack *extack) |
6b9ea5a6 | 3703 | { |
8d1c802b | 3704 | struct fib6_info *rt; |
6b9ea5a6 RP |
3705 | int err; |
3706 | ||
acb54e3c | 3707 | rt = ip6_route_info_create(cfg, gfp_flags, extack); |
d4ead6b3 DA |
3708 | if (IS_ERR(rt)) |
3709 | return PTR_ERR(rt); | |
6b9ea5a6 | 3710 | |
d4ead6b3 | 3711 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack); |
93531c67 | 3712 | fib6_info_release(rt); |
6b9ea5a6 | 3713 | |
1da177e4 LT |
3714 | return err; |
3715 | } | |
3716 | ||
8d1c802b | 3717 | static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info) |
1da177e4 | 3718 | { |
afb1d4b5 | 3719 | struct net *net = info->nl_net; |
c71099ac | 3720 | struct fib6_table *table; |
afb1d4b5 | 3721 | int err; |
1da177e4 | 3722 | |
421842ed | 3723 | if (rt == net->ipv6.fib6_null_entry) { |
6825a26c G |
3724 | err = -ENOENT; |
3725 | goto out; | |
3726 | } | |
6c813a72 | 3727 | |
93c2fb25 | 3728 | table = rt->fib6_table; |
66f5d6ce | 3729 | spin_lock_bh(&table->tb6_lock); |
86872cb5 | 3730 | err = fib6_del(rt, info); |
66f5d6ce | 3731 | spin_unlock_bh(&table->tb6_lock); |
1da177e4 | 3732 | |
6825a26c | 3733 | out: |
93531c67 | 3734 | fib6_info_release(rt); |
1da177e4 LT |
3735 | return err; |
3736 | } | |
3737 | ||
8d1c802b | 3738 | int ip6_del_rt(struct net *net, struct fib6_info *rt) |
e0a1ad73 | 3739 | { |
afb1d4b5 DA |
3740 | struct nl_info info = { .nl_net = net }; |
3741 | ||
528c4ceb | 3742 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
3743 | } |
3744 | ||
8d1c802b | 3745 | static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg) |
0ae81335 DA |
3746 | { |
3747 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 3748 | struct net *net = info->nl_net; |
16a16cd3 | 3749 | struct sk_buff *skb = NULL; |
0ae81335 | 3750 | struct fib6_table *table; |
e3330039 | 3751 | int err = -ENOENT; |
0ae81335 | 3752 | |
421842ed | 3753 | if (rt == net->ipv6.fib6_null_entry) |
e3330039 | 3754 | goto out_put; |
93c2fb25 | 3755 | table = rt->fib6_table; |
66f5d6ce | 3756 | spin_lock_bh(&table->tb6_lock); |
0ae81335 | 3757 | |
93c2fb25 | 3758 | if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) { |
8d1c802b | 3759 | struct fib6_info *sibling, *next_sibling; |
0284696b | 3760 | struct fib6_node *fn; |
0ae81335 | 3761 | |
16a16cd3 DA |
3762 | /* prefer to send a single notification with all hops */ |
3763 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
3764 | if (skb) { | |
3765 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
3766 | ||
d4ead6b3 | 3767 | if (rt6_fill_node(net, skb, rt, NULL, |
16a16cd3 DA |
3768 | NULL, NULL, 0, RTM_DELROUTE, |
3769 | info->portid, seq, 0) < 0) { | |
3770 | kfree_skb(skb); | |
3771 | skb = NULL; | |
3772 | } else | |
3773 | info->skip_notify = 1; | |
3774 | } | |
3775 | ||
0284696b IS |
3776 | /* 'rt' points to the first sibling route. If it is not the |
3777 | * leaf, then we do not need to send a notification. Otherwise, | |
3778 | * we need to check if the last sibling has a next route or not | |
3779 | * and emit a replace or delete notification, respectively. | |
3780 | */ | |
2881fd61 | 3781 | info->skip_notify_kernel = 1; |
0284696b IS |
3782 | fn = rcu_dereference_protected(rt->fib6_node, |
3783 | lockdep_is_held(&table->tb6_lock)); | |
3784 | if (rcu_access_pointer(fn->leaf) == rt) { | |
3785 | struct fib6_info *last_sibling, *replace_rt; | |
3786 | ||
3787 | last_sibling = list_last_entry(&rt->fib6_siblings, | |
3788 | struct fib6_info, | |
3789 | fib6_siblings); | |
3790 | replace_rt = rcu_dereference_protected( | |
3791 | last_sibling->fib6_next, | |
3792 | lockdep_is_held(&table->tb6_lock)); | |
3793 | if (replace_rt) | |
3794 | call_fib6_entry_notifiers_replace(net, | |
3795 | replace_rt); | |
3796 | else | |
3797 | call_fib6_multipath_entry_notifiers(net, | |
caafb250 | 3798 | FIB_EVENT_ENTRY_DEL, |
0284696b IS |
3799 | rt, rt->fib6_nsiblings, |
3800 | NULL); | |
3801 | } | |
0ae81335 | 3802 | list_for_each_entry_safe(sibling, next_sibling, |
93c2fb25 DA |
3803 | &rt->fib6_siblings, |
3804 | fib6_siblings) { | |
0ae81335 DA |
3805 | err = fib6_del(sibling, info); |
3806 | if (err) | |
e3330039 | 3807 | goto out_unlock; |
0ae81335 DA |
3808 | } |
3809 | } | |
3810 | ||
3811 | err = fib6_del(rt, info); | |
e3330039 | 3812 | out_unlock: |
66f5d6ce | 3813 | spin_unlock_bh(&table->tb6_lock); |
e3330039 | 3814 | out_put: |
93531c67 | 3815 | fib6_info_release(rt); |
16a16cd3 DA |
3816 | |
3817 | if (skb) { | |
e3330039 | 3818 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
3819 | info->nlh, gfp_any()); |
3820 | } | |
0ae81335 DA |
3821 | return err; |
3822 | } | |
3823 | ||
0fa6efc5 | 3824 | static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg) |
23fb93a4 DA |
3825 | { |
3826 | int rc = -ESRCH; | |
3827 | ||
3828 | if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex) | |
3829 | goto out; | |
3830 | ||
3831 | if (cfg->fc_flags & RTF_GATEWAY && | |
3832 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
3833 | goto out; | |
761f6026 XL |
3834 | |
3835 | rc = rt6_remove_exception_rt(rt); | |
23fb93a4 DA |
3836 | out: |
3837 | return rc; | |
3838 | } | |
3839 | ||
0fa6efc5 DA |
3840 | static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt, |
3841 | struct fib6_nh *nh) | |
3842 | { | |
3843 | struct fib6_result res = { | |
3844 | .f6i = rt, | |
3845 | .nh = nh, | |
3846 | }; | |
3847 | struct rt6_info *rt_cache; | |
3848 | ||
3849 | rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src); | |
3850 | if (rt_cache) | |
3851 | return __ip6_del_cached_rt(rt_cache, cfg); | |
3852 | ||
3853 | return 0; | |
3854 | } | |
3855 | ||
5b98324e DA |
3856 | struct fib6_nh_del_cached_rt_arg { |
3857 | struct fib6_config *cfg; | |
3858 | struct fib6_info *f6i; | |
3859 | }; | |
3860 | ||
3861 | static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg) | |
3862 | { | |
3863 | struct fib6_nh_del_cached_rt_arg *arg = _arg; | |
3864 | int rc; | |
3865 | ||
3866 | rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh); | |
3867 | return rc != -ESRCH ? rc : 0; | |
3868 | } | |
3869 | ||
3870 | static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i) | |
3871 | { | |
3872 | struct fib6_nh_del_cached_rt_arg arg = { | |
3873 | .cfg = cfg, | |
3874 | .f6i = f6i | |
3875 | }; | |
3876 | ||
3877 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg); | |
3878 | } | |
3879 | ||
333c4301 DA |
3880 | static int ip6_route_del(struct fib6_config *cfg, |
3881 | struct netlink_ext_ack *extack) | |
1da177e4 | 3882 | { |
c71099ac | 3883 | struct fib6_table *table; |
8d1c802b | 3884 | struct fib6_info *rt; |
1da177e4 | 3885 | struct fib6_node *fn; |
1da177e4 LT |
3886 | int err = -ESRCH; |
3887 | ||
5578689a | 3888 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
d5d531cb DA |
3889 | if (!table) { |
3890 | NL_SET_ERR_MSG(extack, "FIB table does not exist"); | |
c71099ac | 3891 | return err; |
d5d531cb | 3892 | } |
c71099ac | 3893 | |
66f5d6ce | 3894 | rcu_read_lock(); |
1da177e4 | 3895 | |
c71099ac | 3896 | fn = fib6_locate(&table->tb6_root, |
86872cb5 | 3897 | &cfg->fc_dst, cfg->fc_dst_len, |
38fbeeee | 3898 | &cfg->fc_src, cfg->fc_src_len, |
2b760fcf | 3899 | !(cfg->fc_flags & RTF_CACHE)); |
1ab1457c | 3900 | |
1da177e4 | 3901 | if (fn) { |
66f5d6ce | 3902 | for_each_fib6_node_rt_rcu(fn) { |
ad1601ae DA |
3903 | struct fib6_nh *nh; |
3904 | ||
3401bfb1 SB |
3905 | if (rt->nh && cfg->fc_nh_id && |
3906 | rt->nh->id != cfg->fc_nh_id) | |
5b98324e | 3907 | continue; |
23fb93a4 | 3908 | |
5b98324e DA |
3909 | if (cfg->fc_flags & RTF_CACHE) { |
3910 | int rc = 0; | |
3911 | ||
3912 | if (rt->nh) { | |
3913 | rc = ip6_del_cached_rt_nh(cfg, rt); | |
3914 | } else if (cfg->fc_nh_id) { | |
3915 | continue; | |
3916 | } else { | |
3917 | nh = rt->fib6_nh; | |
3918 | rc = ip6_del_cached_rt(cfg, rt, nh); | |
3919 | } | |
0fa6efc5 DA |
3920 | if (rc != -ESRCH) { |
3921 | rcu_read_unlock(); | |
3922 | return rc; | |
23fb93a4 DA |
3923 | } |
3924 | continue; | |
2b760fcf | 3925 | } |
ad1601ae | 3926 | |
5b98324e DA |
3927 | if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric) |
3928 | continue; | |
3929 | if (cfg->fc_protocol && | |
3930 | cfg->fc_protocol != rt->fib6_protocol) | |
3931 | continue; | |
3932 | ||
3933 | if (rt->nh) { | |
3934 | if (!fib6_info_hold_safe(rt)) | |
3935 | continue; | |
3936 | rcu_read_unlock(); | |
3937 | ||
3938 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
3939 | } | |
3940 | if (cfg->fc_nh_id) | |
3941 | continue; | |
3942 | ||
3943 | nh = rt->fib6_nh; | |
86872cb5 | 3944 | if (cfg->fc_ifindex && |
ad1601ae DA |
3945 | (!nh->fib_nh_dev || |
3946 | nh->fib_nh_dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 3947 | continue; |
86872cb5 | 3948 | if (cfg->fc_flags & RTF_GATEWAY && |
ad1601ae | 3949 | !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6)) |
1da177e4 | 3950 | continue; |
e873e4b9 WW |
3951 | if (!fib6_info_hold_safe(rt)) |
3952 | continue; | |
66f5d6ce | 3953 | rcu_read_unlock(); |
1da177e4 | 3954 | |
0ae81335 DA |
3955 | /* if gateway was specified only delete the one hop */ |
3956 | if (cfg->fc_flags & RTF_GATEWAY) | |
3957 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
3958 | ||
3959 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
3960 | } |
3961 | } | |
66f5d6ce | 3962 | rcu_read_unlock(); |
1da177e4 LT |
3963 | |
3964 | return err; | |
3965 | } | |
3966 | ||
6700c270 | 3967 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 3968 | { |
a6279458 | 3969 | struct netevent_redirect netevent; |
e8599ff4 | 3970 | struct rt6_info *rt, *nrt = NULL; |
85bd05de | 3971 | struct fib6_result res = {}; |
e8599ff4 DM |
3972 | struct ndisc_options ndopts; |
3973 | struct inet6_dev *in6_dev; | |
3974 | struct neighbour *neigh; | |
71bcdba0 | 3975 | struct rd_msg *msg; |
6e157b6a DM |
3976 | int optlen, on_link; |
3977 | u8 *lladdr; | |
e8599ff4 | 3978 | |
29a3cad5 | 3979 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 3980 | optlen -= sizeof(*msg); |
e8599ff4 DM |
3981 | |
3982 | if (optlen < 0) { | |
6e157b6a | 3983 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
3984 | return; |
3985 | } | |
3986 | ||
71bcdba0 | 3987 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 3988 | |
71bcdba0 | 3989 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 3990 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
3991 | return; |
3992 | } | |
3993 | ||
6e157b6a | 3994 | on_link = 0; |
71bcdba0 | 3995 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 3996 | on_link = 1; |
71bcdba0 | 3997 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 3998 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 3999 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
4000 | return; |
4001 | } | |
4002 | ||
4003 | in6_dev = __in6_dev_get(skb->dev); | |
4004 | if (!in6_dev) | |
4005 | return; | |
4006 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
4007 | return; | |
4008 | ||
4009 | /* RFC2461 8.1: | |
4010 | * The IP source address of the Redirect MUST be the same as the current | |
4011 | * first-hop router for the specified ICMP Destination Address. | |
4012 | */ | |
4013 | ||
f997c55c | 4014 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
4015 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
4016 | return; | |
4017 | } | |
6e157b6a DM |
4018 | |
4019 | lladdr = NULL; | |
e8599ff4 DM |
4020 | if (ndopts.nd_opts_tgt_lladdr) { |
4021 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
4022 | skb->dev); | |
4023 | if (!lladdr) { | |
4024 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
4025 | return; | |
4026 | } | |
4027 | } | |
4028 | ||
6e157b6a | 4029 | rt = (struct rt6_info *) dst; |
ec13ad1d | 4030 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 4031 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 4032 | return; |
6e157b6a | 4033 | } |
e8599ff4 | 4034 | |
6e157b6a DM |
4035 | /* Redirect received -> path was valid. |
4036 | * Look, redirects are sent only in response to data packets, | |
4037 | * so that this nexthop apparently is reachable. --ANK | |
4038 | */ | |
0dec879f | 4039 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 4040 | |
71bcdba0 | 4041 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
4042 | if (!neigh) |
4043 | return; | |
a6279458 | 4044 | |
1da177e4 LT |
4045 | /* |
4046 | * We have finally decided to accept it. | |
4047 | */ | |
4048 | ||
f997c55c | 4049 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
4050 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
4051 | NEIGH_UPDATE_F_OVERRIDE| | |
4052 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
4053 | NEIGH_UPDATE_F_ISROUTER)), |
4054 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 4055 | |
4d85cd0c | 4056 | rcu_read_lock(); |
85bd05de | 4057 | res.f6i = rcu_dereference(rt->from); |
ff24e498 | 4058 | if (!res.f6i) |
886b7a50 | 4059 | goto out; |
8a14e46f | 4060 | |
49d5b8ef DA |
4061 | if (res.f6i->nh) { |
4062 | struct fib6_nh_match_arg arg = { | |
4063 | .dev = dst->dev, | |
4064 | .gw = &rt->rt6i_gateway, | |
4065 | }; | |
4066 | ||
4067 | nexthop_for_each_fib6_nh(res.f6i->nh, | |
4068 | fib6_nh_find_match, &arg); | |
4069 | ||
4070 | /* fib6_info uses a nexthop that does not have fib6_nh | |
4071 | * using the dst->dev. Should be impossible | |
4072 | */ | |
4073 | if (!arg.match) | |
4074 | goto out; | |
4075 | res.nh = arg.match; | |
4076 | } else { | |
4077 | res.nh = res.f6i->fib6_nh; | |
4078 | } | |
4079 | ||
7d21fec9 DA |
4080 | res.fib6_flags = res.f6i->fib6_flags; |
4081 | res.fib6_type = res.f6i->fib6_type; | |
85bd05de | 4082 | nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL); |
38308473 | 4083 | if (!nrt) |
1da177e4 LT |
4084 | goto out; |
4085 | ||
4086 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
4087 | if (on_link) | |
4088 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
4089 | ||
4e3fd7a0 | 4090 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 4091 | |
886b7a50 | 4092 | /* rt6_insert_exception() will take care of duplicated exceptions */ |
5012f0a5 | 4093 | if (rt6_insert_exception(nrt, &res)) { |
2b760fcf WW |
4094 | dst_release_immediate(&nrt->dst); |
4095 | goto out; | |
4096 | } | |
1da177e4 | 4097 | |
d8d1f30b CG |
4098 | netevent.old = &rt->dst; |
4099 | netevent.new = &nrt->dst; | |
71bcdba0 | 4100 | netevent.daddr = &msg->dest; |
60592833 | 4101 | netevent.neigh = neigh; |
8d71740c TT |
4102 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
4103 | ||
1da177e4 | 4104 | out: |
886b7a50 | 4105 | rcu_read_unlock(); |
e8599ff4 | 4106 | neigh_release(neigh); |
6e157b6a DM |
4107 | } |
4108 | ||
70ceb4f5 | 4109 | #ifdef CONFIG_IPV6_ROUTE_INFO |
8d1c802b | 4110 | static struct fib6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 4111 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4112 | const struct in6_addr *gwaddr, |
4113 | struct net_device *dev) | |
70ceb4f5 | 4114 | { |
830218c1 DA |
4115 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
4116 | int ifindex = dev->ifindex; | |
70ceb4f5 | 4117 | struct fib6_node *fn; |
8d1c802b | 4118 | struct fib6_info *rt = NULL; |
c71099ac TG |
4119 | struct fib6_table *table; |
4120 | ||
830218c1 | 4121 | table = fib6_get_table(net, tb_id); |
38308473 | 4122 | if (!table) |
c71099ac | 4123 | return NULL; |
70ceb4f5 | 4124 | |
66f5d6ce | 4125 | rcu_read_lock(); |
38fbeeee | 4126 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true); |
70ceb4f5 YH |
4127 | if (!fn) |
4128 | goto out; | |
4129 | ||
66f5d6ce | 4130 | for_each_fib6_node_rt_rcu(fn) { |
f88d8ea6 DA |
4131 | /* these routes do not use nexthops */ |
4132 | if (rt->nh) | |
4133 | continue; | |
1cf844c7 | 4134 | if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex) |
70ceb4f5 | 4135 | continue; |
2b2450ca | 4136 | if (!(rt->fib6_flags & RTF_ROUTEINFO) || |
1cf844c7 | 4137 | !rt->fib6_nh->fib_nh_gw_family) |
70ceb4f5 | 4138 | continue; |
1cf844c7 | 4139 | if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr)) |
70ceb4f5 | 4140 | continue; |
e873e4b9 WW |
4141 | if (!fib6_info_hold_safe(rt)) |
4142 | continue; | |
70ceb4f5 YH |
4143 | break; |
4144 | } | |
4145 | out: | |
66f5d6ce | 4146 | rcu_read_unlock(); |
70ceb4f5 YH |
4147 | return rt; |
4148 | } | |
4149 | ||
8d1c802b | 4150 | static struct fib6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 4151 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
4152 | const struct in6_addr *gwaddr, |
4153 | struct net_device *dev, | |
95c96174 | 4154 | unsigned int pref) |
70ceb4f5 | 4155 | { |
86872cb5 | 4156 | struct fib6_config cfg = { |
238fc7ea | 4157 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 4158 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
4159 | .fc_dst_len = prefixlen, |
4160 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
4161 | RTF_UP | RTF_PREF(pref), | |
b91d5329 | 4162 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4163 | .fc_type = RTN_UNICAST, |
15e47304 | 4164 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
4165 | .fc_nlinfo.nlh = NULL, |
4166 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
4167 | }; |
4168 | ||
830218c1 | 4169 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
4170 | cfg.fc_dst = *prefix; |
4171 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 4172 | |
e317da96 YH |
4173 | /* We should treat it as a default route if prefix length is 0. */ |
4174 | if (!prefixlen) | |
86872cb5 | 4175 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 4176 | |
acb54e3c | 4177 | ip6_route_add(&cfg, GFP_ATOMIC, NULL); |
70ceb4f5 | 4178 | |
830218c1 | 4179 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
4180 | } |
4181 | #endif | |
4182 | ||
8d1c802b | 4183 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 DA |
4184 | const struct in6_addr *addr, |
4185 | struct net_device *dev) | |
1ab1457c | 4186 | { |
830218c1 | 4187 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
8d1c802b | 4188 | struct fib6_info *rt; |
c71099ac | 4189 | struct fib6_table *table; |
1da177e4 | 4190 | |
afb1d4b5 | 4191 | table = fib6_get_table(net, tb_id); |
38308473 | 4192 | if (!table) |
c71099ac | 4193 | return NULL; |
1da177e4 | 4194 | |
66f5d6ce WW |
4195 | rcu_read_lock(); |
4196 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
f88d8ea6 | 4197 | struct fib6_nh *nh; |
ad1601ae | 4198 | |
f88d8ea6 DA |
4199 | /* RA routes do not use nexthops */ |
4200 | if (rt->nh) | |
4201 | continue; | |
4202 | ||
4203 | nh = rt->fib6_nh; | |
ad1601ae | 4204 | if (dev == nh->fib_nh_dev && |
93c2fb25 | 4205 | ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
ad1601ae | 4206 | ipv6_addr_equal(&nh->fib_nh_gw6, addr)) |
1da177e4 LT |
4207 | break; |
4208 | } | |
e873e4b9 WW |
4209 | if (rt && !fib6_info_hold_safe(rt)) |
4210 | rt = NULL; | |
66f5d6ce | 4211 | rcu_read_unlock(); |
1da177e4 LT |
4212 | return rt; |
4213 | } | |
4214 | ||
8d1c802b | 4215 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 4216 | const struct in6_addr *gwaddr, |
ebacaaa0 YH |
4217 | struct net_device *dev, |
4218 | unsigned int pref) | |
1da177e4 | 4219 | { |
86872cb5 | 4220 | struct fib6_config cfg = { |
ca254490 | 4221 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 4222 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
4223 | .fc_ifindex = dev->ifindex, |
4224 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
4225 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
b91d5329 | 4226 | .fc_protocol = RTPROT_RA, |
e8478e80 | 4227 | .fc_type = RTN_UNICAST, |
15e47304 | 4228 | .fc_nlinfo.portid = 0, |
5578689a | 4229 | .fc_nlinfo.nlh = NULL, |
afb1d4b5 | 4230 | .fc_nlinfo.nl_net = net, |
86872cb5 | 4231 | }; |
1da177e4 | 4232 | |
4e3fd7a0 | 4233 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 4234 | |
acb54e3c | 4235 | if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) { |
830218c1 DA |
4236 | struct fib6_table *table; |
4237 | ||
4238 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
4239 | if (table) | |
4240 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
4241 | } | |
1da177e4 | 4242 | |
afb1d4b5 | 4243 | return rt6_get_dflt_router(net, gwaddr, dev); |
1da177e4 LT |
4244 | } |
4245 | ||
afb1d4b5 DA |
4246 | static void __rt6_purge_dflt_routers(struct net *net, |
4247 | struct fib6_table *table) | |
1da177e4 | 4248 | { |
8d1c802b | 4249 | struct fib6_info *rt; |
1da177e4 LT |
4250 | |
4251 | restart: | |
66f5d6ce WW |
4252 | rcu_read_lock(); |
4253 | for_each_fib6_node_rt_rcu(&table->tb6_root) { | |
dcd1f572 DA |
4254 | struct net_device *dev = fib6_info_nh_dev(rt); |
4255 | struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL; | |
4256 | ||
93c2fb25 | 4257 | if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
e873e4b9 WW |
4258 | (!idev || idev->cnf.accept_ra != 2) && |
4259 | fib6_info_hold_safe(rt)) { | |
93531c67 DA |
4260 | rcu_read_unlock(); |
4261 | ip6_del_rt(net, rt); | |
1da177e4 LT |
4262 | goto restart; |
4263 | } | |
4264 | } | |
66f5d6ce | 4265 | rcu_read_unlock(); |
830218c1 DA |
4266 | |
4267 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
4268 | } | |
4269 | ||
4270 | void rt6_purge_dflt_routers(struct net *net) | |
4271 | { | |
4272 | struct fib6_table *table; | |
4273 | struct hlist_head *head; | |
4274 | unsigned int h; | |
4275 | ||
4276 | rcu_read_lock(); | |
4277 | ||
4278 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
4279 | head = &net->ipv6.fib_table_hash[h]; | |
4280 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
4281 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
afb1d4b5 | 4282 | __rt6_purge_dflt_routers(net, table); |
830218c1 DA |
4283 | } |
4284 | } | |
4285 | ||
4286 | rcu_read_unlock(); | |
1da177e4 LT |
4287 | } |
4288 | ||
5578689a DL |
4289 | static void rtmsg_to_fib6_config(struct net *net, |
4290 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
4291 | struct fib6_config *cfg) |
4292 | { | |
8823a3ac MŻ |
4293 | *cfg = (struct fib6_config){ |
4294 | .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? | |
4295 | : RT6_TABLE_MAIN, | |
4296 | .fc_ifindex = rtmsg->rtmsg_ifindex, | |
67f69513 | 4297 | .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER, |
8823a3ac MŻ |
4298 | .fc_expires = rtmsg->rtmsg_info, |
4299 | .fc_dst_len = rtmsg->rtmsg_dst_len, | |
4300 | .fc_src_len = rtmsg->rtmsg_src_len, | |
4301 | .fc_flags = rtmsg->rtmsg_flags, | |
4302 | .fc_type = rtmsg->rtmsg_type, | |
4303 | ||
4304 | .fc_nlinfo.nl_net = net, | |
4305 | ||
4306 | .fc_dst = rtmsg->rtmsg_dst, | |
4307 | .fc_src = rtmsg->rtmsg_src, | |
4308 | .fc_gateway = rtmsg->rtmsg_gateway, | |
4309 | }; | |
86872cb5 TG |
4310 | } |
4311 | ||
5578689a | 4312 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 4313 | { |
86872cb5 | 4314 | struct fib6_config cfg; |
1da177e4 LT |
4315 | struct in6_rtmsg rtmsg; |
4316 | int err; | |
4317 | ||
67ba4152 | 4318 | switch (cmd) { |
1da177e4 LT |
4319 | case SIOCADDRT: /* Add a route */ |
4320 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 4321 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
4322 | return -EPERM; |
4323 | err = copy_from_user(&rtmsg, arg, | |
4324 | sizeof(struct in6_rtmsg)); | |
4325 | if (err) | |
4326 | return -EFAULT; | |
86872cb5 | 4327 | |
5578689a | 4328 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 4329 | |
1da177e4 LT |
4330 | rtnl_lock(); |
4331 | switch (cmd) { | |
4332 | case SIOCADDRT: | |
acb54e3c | 4333 | err = ip6_route_add(&cfg, GFP_KERNEL, NULL); |
1da177e4 LT |
4334 | break; |
4335 | case SIOCDELRT: | |
333c4301 | 4336 | err = ip6_route_del(&cfg, NULL); |
1da177e4 LT |
4337 | break; |
4338 | default: | |
4339 | err = -EINVAL; | |
4340 | } | |
4341 | rtnl_unlock(); | |
4342 | ||
4343 | return err; | |
3ff50b79 | 4344 | } |
1da177e4 LT |
4345 | |
4346 | return -EINVAL; | |
4347 | } | |
4348 | ||
4349 | /* | |
4350 | * Drop the packet on the floor | |
4351 | */ | |
4352 | ||
d5fdd6ba | 4353 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 4354 | { |
adf30907 | 4355 | struct dst_entry *dst = skb_dst(skb); |
1d3fd8a1 SS |
4356 | struct net *net = dev_net(dst->dev); |
4357 | struct inet6_dev *idev; | |
4358 | int type; | |
4359 | ||
4360 | if (netif_is_l3_master(skb->dev) && | |
4361 | dst->dev == net->loopback_dev) | |
4362 | idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif)); | |
4363 | else | |
4364 | idev = ip6_dst_idev(dst); | |
4365 | ||
612f09e8 YH |
4366 | switch (ipstats_mib_noroutes) { |
4367 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 4368 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 4369 | if (type == IPV6_ADDR_ANY) { |
1d3fd8a1 | 4370 | IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS); |
612f09e8 YH |
4371 | break; |
4372 | } | |
4373 | /* FALLTHROUGH */ | |
4374 | case IPSTATS_MIB_OUTNOROUTES: | |
1d3fd8a1 | 4375 | IP6_INC_STATS(net, idev, ipstats_mib_noroutes); |
612f09e8 YH |
4376 | break; |
4377 | } | |
1d3fd8a1 SS |
4378 | |
4379 | /* Start over by dropping the dst for l3mdev case */ | |
4380 | if (netif_is_l3_master(skb->dev)) | |
4381 | skb_dst_drop(skb); | |
4382 | ||
3ffe533c | 4383 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
4384 | kfree_skb(skb); |
4385 | return 0; | |
4386 | } | |
4387 | ||
9ce8ade0 TG |
4388 | static int ip6_pkt_discard(struct sk_buff *skb) |
4389 | { | |
612f09e8 | 4390 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4391 | } |
4392 | ||
ede2059d | 4393 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 4394 | { |
adf30907 | 4395 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4396 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
4397 | } |
4398 | ||
9ce8ade0 TG |
4399 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
4400 | { | |
612f09e8 | 4401 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
4402 | } |
4403 | ||
ede2059d | 4404 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 4405 | { |
adf30907 | 4406 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 4407 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
4408 | } |
4409 | ||
1da177e4 LT |
4410 | /* |
4411 | * Allocate a dst for local (unicast / anycast) address. | |
4412 | */ | |
4413 | ||
360a9887 DA |
4414 | struct fib6_info *addrconf_f6i_alloc(struct net *net, |
4415 | struct inet6_dev *idev, | |
4416 | const struct in6_addr *addr, | |
4417 | bool anycast, gfp_t gfp_flags) | |
1da177e4 | 4418 | { |
c7a1ce39 DA |
4419 | struct fib6_config cfg = { |
4420 | .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL, | |
4421 | .fc_ifindex = idev->dev->ifindex, | |
d55a2e37 | 4422 | .fc_flags = RTF_UP | RTF_NONEXTHOP, |
c7a1ce39 DA |
4423 | .fc_dst = *addr, |
4424 | .fc_dst_len = 128, | |
4425 | .fc_protocol = RTPROT_KERNEL, | |
4426 | .fc_nlinfo.nl_net = net, | |
4427 | .fc_ignore_dev_down = true, | |
4428 | }; | |
d55a2e37 | 4429 | struct fib6_info *f6i; |
1da177e4 | 4430 | |
e8478e80 | 4431 | if (anycast) { |
c7a1ce39 DA |
4432 | cfg.fc_type = RTN_ANYCAST; |
4433 | cfg.fc_flags |= RTF_ANYCAST; | |
e8478e80 | 4434 | } else { |
c7a1ce39 DA |
4435 | cfg.fc_type = RTN_LOCAL; |
4436 | cfg.fc_flags |= RTF_LOCAL; | |
e8478e80 | 4437 | } |
1da177e4 | 4438 | |
d55a2e37 | 4439 | f6i = ip6_route_info_create(&cfg, gfp_flags, NULL); |
8652f17c | 4440 | if (!IS_ERR(f6i)) |
d55a2e37 MŻ |
4441 | f6i->dst_nocount = true; |
4442 | return f6i; | |
1da177e4 LT |
4443 | } |
4444 | ||
c3968a85 DW |
4445 | /* remove deleted ip from prefsrc entries */ |
4446 | struct arg_dev_net_ip { | |
4447 | struct net_device *dev; | |
4448 | struct net *net; | |
4449 | struct in6_addr *addr; | |
4450 | }; | |
4451 | ||
8d1c802b | 4452 | static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg) |
c3968a85 DW |
4453 | { |
4454 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
4455 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
4456 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
4457 | ||
f88d8ea6 DA |
4458 | if (!rt->nh && |
4459 | ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) && | |
421842ed | 4460 | rt != net->ipv6.fib6_null_entry && |
93c2fb25 | 4461 | ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) { |
60006a48 | 4462 | spin_lock_bh(&rt6_exception_lock); |
c3968a85 | 4463 | /* remove prefsrc entry */ |
93c2fb25 | 4464 | rt->fib6_prefsrc.plen = 0; |
60006a48 | 4465 | spin_unlock_bh(&rt6_exception_lock); |
c3968a85 DW |
4466 | } |
4467 | return 0; | |
4468 | } | |
4469 | ||
4470 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
4471 | { | |
4472 | struct net *net = dev_net(ifp->idev->dev); | |
4473 | struct arg_dev_net_ip adni = { | |
4474 | .dev = ifp->idev->dev, | |
4475 | .net = net, | |
4476 | .addr = &ifp->addr, | |
4477 | }; | |
0c3584d5 | 4478 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
4479 | } |
4480 | ||
2b2450ca | 4481 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT) |
be7a010d DJ |
4482 | |
4483 | /* Remove routers and update dst entries when gateway turn into host. */ | |
8d1c802b | 4484 | static int fib6_clean_tohost(struct fib6_info *rt, void *arg) |
be7a010d DJ |
4485 | { |
4486 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
f88d8ea6 DA |
4487 | struct fib6_nh *nh; |
4488 | ||
4489 | /* RA routes do not use nexthops */ | |
4490 | if (rt->nh) | |
4491 | return 0; | |
be7a010d | 4492 | |
f88d8ea6 | 4493 | nh = rt->fib6_nh; |
93c2fb25 | 4494 | if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) && |
cc5c073a | 4495 | nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6)) |
be7a010d | 4496 | return -1; |
b16cb459 WW |
4497 | |
4498 | /* Further clean up cached routes in exception table. | |
4499 | * This is needed because cached route may have a different | |
4500 | * gateway than its 'parent' in the case of an ip redirect. | |
4501 | */ | |
cc5c073a | 4502 | fib6_nh_exceptions_clean_tohost(nh, gateway); |
b16cb459 | 4503 | |
be7a010d DJ |
4504 | return 0; |
4505 | } | |
4506 | ||
4507 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
4508 | { | |
4509 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
4510 | } | |
4511 | ||
2127d95a IS |
4512 | struct arg_netdev_event { |
4513 | const struct net_device *dev; | |
4c981e28 | 4514 | union { |
ecc5663c | 4515 | unsigned char nh_flags; |
4c981e28 IS |
4516 | unsigned long event; |
4517 | }; | |
2127d95a IS |
4518 | }; |
4519 | ||
8d1c802b | 4520 | static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt) |
d7dedee1 | 4521 | { |
8d1c802b | 4522 | struct fib6_info *iter; |
d7dedee1 IS |
4523 | struct fib6_node *fn; |
4524 | ||
93c2fb25 DA |
4525 | fn = rcu_dereference_protected(rt->fib6_node, |
4526 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
d7dedee1 | 4527 | iter = rcu_dereference_protected(fn->leaf, |
93c2fb25 | 4528 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 | 4529 | while (iter) { |
93c2fb25 | 4530 | if (iter->fib6_metric == rt->fib6_metric && |
33bd5ac5 | 4531 | rt6_qualify_for_ecmp(iter)) |
d7dedee1 | 4532 | return iter; |
8fb11a9a | 4533 | iter = rcu_dereference_protected(iter->fib6_next, |
93c2fb25 | 4534 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
d7dedee1 IS |
4535 | } |
4536 | ||
4537 | return NULL; | |
4538 | } | |
4539 | ||
f88d8ea6 | 4540 | /* only called for fib entries with builtin fib6_nh */ |
8d1c802b | 4541 | static bool rt6_is_dead(const struct fib6_info *rt) |
d7dedee1 | 4542 | { |
1cf844c7 DA |
4543 | if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD || |
4544 | (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN && | |
4545 | ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev))) | |
d7dedee1 IS |
4546 | return true; |
4547 | ||
4548 | return false; | |
4549 | } | |
4550 | ||
8d1c802b | 4551 | static int rt6_multipath_total_weight(const struct fib6_info *rt) |
d7dedee1 | 4552 | { |
8d1c802b | 4553 | struct fib6_info *iter; |
d7dedee1 IS |
4554 | int total = 0; |
4555 | ||
4556 | if (!rt6_is_dead(rt)) | |
1cf844c7 | 4557 | total += rt->fib6_nh->fib_nh_weight; |
d7dedee1 | 4558 | |
93c2fb25 | 4559 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) { |
d7dedee1 | 4560 | if (!rt6_is_dead(iter)) |
1cf844c7 | 4561 | total += iter->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4562 | } |
4563 | ||
4564 | return total; | |
4565 | } | |
4566 | ||
8d1c802b | 4567 | static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total) |
d7dedee1 IS |
4568 | { |
4569 | int upper_bound = -1; | |
4570 | ||
4571 | if (!rt6_is_dead(rt)) { | |
1cf844c7 | 4572 | *weight += rt->fib6_nh->fib_nh_weight; |
d7dedee1 IS |
4573 | upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31, |
4574 | total) - 1; | |
4575 | } | |
1cf844c7 | 4576 | atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound); |
d7dedee1 IS |
4577 | } |
4578 | ||
8d1c802b | 4579 | static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total) |
d7dedee1 | 4580 | { |
8d1c802b | 4581 | struct fib6_info *iter; |
d7dedee1 IS |
4582 | int weight = 0; |
4583 | ||
4584 | rt6_upper_bound_set(rt, &weight, total); | |
4585 | ||
93c2fb25 | 4586 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
d7dedee1 IS |
4587 | rt6_upper_bound_set(iter, &weight, total); |
4588 | } | |
4589 | ||
8d1c802b | 4590 | void rt6_multipath_rebalance(struct fib6_info *rt) |
d7dedee1 | 4591 | { |
8d1c802b | 4592 | struct fib6_info *first; |
d7dedee1 IS |
4593 | int total; |
4594 | ||
4595 | /* In case the entire multipath route was marked for flushing, | |
4596 | * then there is no need to rebalance upon the removal of every | |
4597 | * sibling route. | |
4598 | */ | |
93c2fb25 | 4599 | if (!rt->fib6_nsiblings || rt->should_flush) |
d7dedee1 IS |
4600 | return; |
4601 | ||
4602 | /* During lookup routes are evaluated in order, so we need to | |
4603 | * make sure upper bounds are assigned from the first sibling | |
4604 | * onwards. | |
4605 | */ | |
4606 | first = rt6_multipath_first_sibling(rt); | |
4607 | if (WARN_ON_ONCE(!first)) | |
4608 | return; | |
4609 | ||
4610 | total = rt6_multipath_total_weight(first); | |
4611 | rt6_multipath_upper_bound_set(first, total); | |
4612 | } | |
4613 | ||
8d1c802b | 4614 | static int fib6_ifup(struct fib6_info *rt, void *p_arg) |
2127d95a IS |
4615 | { |
4616 | const struct arg_netdev_event *arg = p_arg; | |
7aef6859 | 4617 | struct net *net = dev_net(arg->dev); |
2127d95a | 4618 | |
f88d8ea6 | 4619 | if (rt != net->ipv6.fib6_null_entry && !rt->nh && |
1cf844c7 DA |
4620 | rt->fib6_nh->fib_nh_dev == arg->dev) { |
4621 | rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags; | |
7aef6859 | 4622 | fib6_update_sernum_upto_root(net, rt); |
d7dedee1 | 4623 | rt6_multipath_rebalance(rt); |
1de178ed | 4624 | } |
2127d95a IS |
4625 | |
4626 | return 0; | |
4627 | } | |
4628 | ||
ecc5663c | 4629 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags) |
2127d95a IS |
4630 | { |
4631 | struct arg_netdev_event arg = { | |
4632 | .dev = dev, | |
6802f3ad IS |
4633 | { |
4634 | .nh_flags = nh_flags, | |
4635 | }, | |
2127d95a IS |
4636 | }; |
4637 | ||
4638 | if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev)) | |
4639 | arg.nh_flags |= RTNH_F_LINKDOWN; | |
4640 | ||
4641 | fib6_clean_all(dev_net(dev), fib6_ifup, &arg); | |
4642 | } | |
4643 | ||
f88d8ea6 | 4644 | /* only called for fib entries with inline fib6_nh */ |
8d1c802b | 4645 | static bool rt6_multipath_uses_dev(const struct fib6_info *rt, |
1de178ed IS |
4646 | const struct net_device *dev) |
4647 | { | |
8d1c802b | 4648 | struct fib6_info *iter; |
1de178ed | 4649 | |
1cf844c7 | 4650 | if (rt->fib6_nh->fib_nh_dev == dev) |
1de178ed | 4651 | return true; |
93c2fb25 | 4652 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 | 4653 | if (iter->fib6_nh->fib_nh_dev == dev) |
1de178ed IS |
4654 | return true; |
4655 | ||
4656 | return false; | |
4657 | } | |
4658 | ||
8d1c802b | 4659 | static void rt6_multipath_flush(struct fib6_info *rt) |
1de178ed | 4660 | { |
8d1c802b | 4661 | struct fib6_info *iter; |
1de178ed IS |
4662 | |
4663 | rt->should_flush = 1; | |
93c2fb25 | 4664 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1de178ed IS |
4665 | iter->should_flush = 1; |
4666 | } | |
4667 | ||
8d1c802b | 4668 | static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt, |
1de178ed IS |
4669 | const struct net_device *down_dev) |
4670 | { | |
8d1c802b | 4671 | struct fib6_info *iter; |
1de178ed IS |
4672 | unsigned int dead = 0; |
4673 | ||
1cf844c7 DA |
4674 | if (rt->fib6_nh->fib_nh_dev == down_dev || |
4675 | rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed | 4676 | dead++; |
93c2fb25 | 4677 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4678 | if (iter->fib6_nh->fib_nh_dev == down_dev || |
4679 | iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD) | |
1de178ed IS |
4680 | dead++; |
4681 | ||
4682 | return dead; | |
4683 | } | |
4684 | ||
8d1c802b | 4685 | static void rt6_multipath_nh_flags_set(struct fib6_info *rt, |
1de178ed | 4686 | const struct net_device *dev, |
ecc5663c | 4687 | unsigned char nh_flags) |
1de178ed | 4688 | { |
8d1c802b | 4689 | struct fib6_info *iter; |
1de178ed | 4690 | |
1cf844c7 DA |
4691 | if (rt->fib6_nh->fib_nh_dev == dev) |
4692 | rt->fib6_nh->fib_nh_flags |= nh_flags; | |
93c2fb25 | 4693 | list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) |
1cf844c7 DA |
4694 | if (iter->fib6_nh->fib_nh_dev == dev) |
4695 | iter->fib6_nh->fib_nh_flags |= nh_flags; | |
1de178ed IS |
4696 | } |
4697 | ||
a1a22c12 | 4698 | /* called with write lock held for table with rt */ |
8d1c802b | 4699 | static int fib6_ifdown(struct fib6_info *rt, void *p_arg) |
1da177e4 | 4700 | { |
4c981e28 IS |
4701 | const struct arg_netdev_event *arg = p_arg; |
4702 | const struct net_device *dev = arg->dev; | |
7aef6859 | 4703 | struct net *net = dev_net(dev); |
8ed67789 | 4704 | |
f88d8ea6 | 4705 | if (rt == net->ipv6.fib6_null_entry || rt->nh) |
27c6fa73 IS |
4706 | return 0; |
4707 | ||
4708 | switch (arg->event) { | |
4709 | case NETDEV_UNREGISTER: | |
1cf844c7 | 4710 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
27c6fa73 | 4711 | case NETDEV_DOWN: |
1de178ed | 4712 | if (rt->should_flush) |
27c6fa73 | 4713 | return -1; |
93c2fb25 | 4714 | if (!rt->fib6_nsiblings) |
1cf844c7 | 4715 | return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0; |
1de178ed IS |
4716 | if (rt6_multipath_uses_dev(rt, dev)) { |
4717 | unsigned int count; | |
4718 | ||
4719 | count = rt6_multipath_dead_count(rt, dev); | |
93c2fb25 | 4720 | if (rt->fib6_nsiblings + 1 == count) { |
1de178ed IS |
4721 | rt6_multipath_flush(rt); |
4722 | return -1; | |
4723 | } | |
4724 | rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD | | |
4725 | RTNH_F_LINKDOWN); | |
7aef6859 | 4726 | fib6_update_sernum(net, rt); |
d7dedee1 | 4727 | rt6_multipath_rebalance(rt); |
1de178ed IS |
4728 | } |
4729 | return -2; | |
27c6fa73 | 4730 | case NETDEV_CHANGE: |
1cf844c7 | 4731 | if (rt->fib6_nh->fib_nh_dev != dev || |
93c2fb25 | 4732 | rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) |
27c6fa73 | 4733 | break; |
1cf844c7 | 4734 | rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN; |
d7dedee1 | 4735 | rt6_multipath_rebalance(rt); |
27c6fa73 | 4736 | break; |
2b241361 | 4737 | } |
c159d30c | 4738 | |
1da177e4 LT |
4739 | return 0; |
4740 | } | |
4741 | ||
27c6fa73 | 4742 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event) |
1da177e4 | 4743 | { |
4c981e28 | 4744 | struct arg_netdev_event arg = { |
8ed67789 | 4745 | .dev = dev, |
6802f3ad IS |
4746 | { |
4747 | .event = event, | |
4748 | }, | |
8ed67789 | 4749 | }; |
7c6bb7d2 | 4750 | struct net *net = dev_net(dev); |
8ed67789 | 4751 | |
7c6bb7d2 DA |
4752 | if (net->ipv6.sysctl.skip_notify_on_dev_down) |
4753 | fib6_clean_all_skip_notify(net, fib6_ifdown, &arg); | |
4754 | else | |
4755 | fib6_clean_all(net, fib6_ifdown, &arg); | |
4c981e28 IS |
4756 | } |
4757 | ||
4758 | void rt6_disable_ip(struct net_device *dev, unsigned long event) | |
4759 | { | |
4760 | rt6_sync_down_dev(dev, event); | |
4761 | rt6_uncached_list_flush_dev(dev_net(dev), dev); | |
4762 | neigh_ifdown(&nd_tbl, dev); | |
1da177e4 LT |
4763 | } |
4764 | ||
95c96174 | 4765 | struct rt6_mtu_change_arg { |
1da177e4 | 4766 | struct net_device *dev; |
95c96174 | 4767 | unsigned int mtu; |
c0b220cf | 4768 | struct fib6_info *f6i; |
1da177e4 LT |
4769 | }; |
4770 | ||
cc5c073a | 4771 | static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg) |
c0b220cf DA |
4772 | { |
4773 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg; | |
cc5c073a | 4774 | struct fib6_info *f6i = arg->f6i; |
c0b220cf DA |
4775 | |
4776 | /* For administrative MTU increase, there is no way to discover | |
4777 | * IPv6 PMTU increase, so PMTU increase should be updated here. | |
4778 | * Since RFC 1981 doesn't include administrative MTU increase | |
4779 | * update PMTU increase is a MUST. (i.e. jumbo frame) | |
4780 | */ | |
4781 | if (nh->fib_nh_dev == arg->dev) { | |
4782 | struct inet6_dev *idev = __in6_dev_get(arg->dev); | |
4783 | u32 mtu = f6i->fib6_pmtu; | |
4784 | ||
4785 | if (mtu >= arg->mtu || | |
4786 | (mtu < arg->mtu && mtu == idev->cnf.mtu6)) | |
4787 | fib6_metric_set(f6i, RTAX_MTU, arg->mtu); | |
4788 | ||
4789 | spin_lock_bh(&rt6_exception_lock); | |
cc5c073a | 4790 | rt6_exceptions_update_pmtu(idev, nh, arg->mtu); |
c0b220cf DA |
4791 | spin_unlock_bh(&rt6_exception_lock); |
4792 | } | |
4793 | ||
4794 | return 0; | |
4795 | } | |
4796 | ||
4797 | static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg) | |
1da177e4 LT |
4798 | { |
4799 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
4800 | struct inet6_dev *idev; | |
4801 | ||
4802 | /* In IPv6 pmtu discovery is not optional, | |
4803 | so that RTAX_MTU lock cannot disable it. | |
4804 | We still use this lock to block changes | |
4805 | caused by addrconf/ndisc. | |
4806 | */ | |
4807 | ||
4808 | idev = __in6_dev_get(arg->dev); | |
38308473 | 4809 | if (!idev) |
1da177e4 LT |
4810 | return 0; |
4811 | ||
c0b220cf DA |
4812 | if (fib6_metric_locked(f6i, RTAX_MTU)) |
4813 | return 0; | |
d4ead6b3 | 4814 | |
c0b220cf | 4815 | arg->f6i = f6i; |
2d44234b DA |
4816 | if (f6i->nh) { |
4817 | /* fib6_nh_mtu_change only returns 0, so this is safe */ | |
4818 | return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change, | |
4819 | arg); | |
4820 | } | |
4821 | ||
1cf844c7 | 4822 | return fib6_nh_mtu_change(f6i->fib6_nh, arg); |
1da177e4 LT |
4823 | } |
4824 | ||
95c96174 | 4825 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 4826 | { |
c71099ac TG |
4827 | struct rt6_mtu_change_arg arg = { |
4828 | .dev = dev, | |
4829 | .mtu = mtu, | |
4830 | }; | |
1da177e4 | 4831 | |
0c3584d5 | 4832 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
4833 | } |
4834 | ||
ef7c79ed | 4835 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
75425657 | 4836 | [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, |
5176f91e | 4837 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
aa8f8778 | 4838 | [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 4839 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 4840 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
4841 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
4842 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 4843 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 4844 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
4845 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
4846 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 4847 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 4848 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 4849 | [RTA_MARK] = { .type = NLA_U32 }, |
aa8f8778 | 4850 | [RTA_TABLE] = { .type = NLA_U32 }, |
eacb9384 RP |
4851 | [RTA_IP_PROTO] = { .type = NLA_U8 }, |
4852 | [RTA_SPORT] = { .type = NLA_U16 }, | |
4853 | [RTA_DPORT] = { .type = NLA_U16 }, | |
5b98324e | 4854 | [RTA_NH_ID] = { .type = NLA_U32 }, |
86872cb5 TG |
4855 | }; |
4856 | ||
4857 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
333c4301 DA |
4858 | struct fib6_config *cfg, |
4859 | struct netlink_ext_ack *extack) | |
1da177e4 | 4860 | { |
86872cb5 TG |
4861 | struct rtmsg *rtm; |
4862 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 4863 | unsigned int pref; |
86872cb5 | 4864 | int err; |
1da177e4 | 4865 | |
8cb08174 JB |
4866 | err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
4867 | rtm_ipv6_policy, extack); | |
86872cb5 TG |
4868 | if (err < 0) |
4869 | goto errout; | |
1da177e4 | 4870 | |
86872cb5 TG |
4871 | err = -EINVAL; |
4872 | rtm = nlmsg_data(nlh); | |
86872cb5 | 4873 | |
84db8407 MŻ |
4874 | *cfg = (struct fib6_config){ |
4875 | .fc_table = rtm->rtm_table, | |
4876 | .fc_dst_len = rtm->rtm_dst_len, | |
4877 | .fc_src_len = rtm->rtm_src_len, | |
4878 | .fc_flags = RTF_UP, | |
4879 | .fc_protocol = rtm->rtm_protocol, | |
4880 | .fc_type = rtm->rtm_type, | |
4881 | ||
4882 | .fc_nlinfo.portid = NETLINK_CB(skb).portid, | |
4883 | .fc_nlinfo.nlh = nlh, | |
4884 | .fc_nlinfo.nl_net = sock_net(skb->sk), | |
4885 | }; | |
86872cb5 | 4886 | |
ef2c7d7b ND |
4887 | if (rtm->rtm_type == RTN_UNREACHABLE || |
4888 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
4889 | rtm->rtm_type == RTN_PROHIBIT || |
4890 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
4891 | cfg->fc_flags |= RTF_REJECT; |
4892 | ||
ab79ad14 MŻ |
4893 | if (rtm->rtm_type == RTN_LOCAL) |
4894 | cfg->fc_flags |= RTF_LOCAL; | |
4895 | ||
1f56a01f MKL |
4896 | if (rtm->rtm_flags & RTM_F_CLONED) |
4897 | cfg->fc_flags |= RTF_CACHE; | |
4898 | ||
fc1e64e1 DA |
4899 | cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK); |
4900 | ||
5b98324e DA |
4901 | if (tb[RTA_NH_ID]) { |
4902 | if (tb[RTA_GATEWAY] || tb[RTA_OIF] || | |
4903 | tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) { | |
4904 | NL_SET_ERR_MSG(extack, | |
4905 | "Nexthop specification and nexthop id are mutually exclusive"); | |
4906 | goto errout; | |
4907 | } | |
4908 | cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]); | |
4909 | } | |
4910 | ||
86872cb5 | 4911 | if (tb[RTA_GATEWAY]) { |
67b61f6c | 4912 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 4913 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 4914 | } |
e3818541 DA |
4915 | if (tb[RTA_VIA]) { |
4916 | NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute"); | |
4917 | goto errout; | |
4918 | } | |
86872cb5 TG |
4919 | |
4920 | if (tb[RTA_DST]) { | |
4921 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
4922 | ||
4923 | if (nla_len(tb[RTA_DST]) < plen) | |
4924 | goto errout; | |
4925 | ||
4926 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 4927 | } |
86872cb5 TG |
4928 | |
4929 | if (tb[RTA_SRC]) { | |
4930 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
4931 | ||
4932 | if (nla_len(tb[RTA_SRC]) < plen) | |
4933 | goto errout; | |
4934 | ||
4935 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 4936 | } |
86872cb5 | 4937 | |
c3968a85 | 4938 | if (tb[RTA_PREFSRC]) |
67b61f6c | 4939 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 4940 | |
86872cb5 TG |
4941 | if (tb[RTA_OIF]) |
4942 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
4943 | ||
4944 | if (tb[RTA_PRIORITY]) | |
4945 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
4946 | ||
4947 | if (tb[RTA_METRICS]) { | |
4948 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
4949 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 4950 | } |
86872cb5 TG |
4951 | |
4952 | if (tb[RTA_TABLE]) | |
4953 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
4954 | ||
51ebd318 ND |
4955 | if (tb[RTA_MULTIPATH]) { |
4956 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
4957 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
4958 | |
4959 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
c255bd68 | 4960 | cfg->fc_mp_len, extack); |
9ed59592 DA |
4961 | if (err < 0) |
4962 | goto errout; | |
51ebd318 ND |
4963 | } |
4964 | ||
c78ba6d6 LR |
4965 | if (tb[RTA_PREF]) { |
4966 | pref = nla_get_u8(tb[RTA_PREF]); | |
4967 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
4968 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
4969 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
4970 | cfg->fc_flags |= RTF_PREF(pref); | |
4971 | } | |
4972 | ||
19e42e45 RP |
4973 | if (tb[RTA_ENCAP]) |
4974 | cfg->fc_encap = tb[RTA_ENCAP]; | |
4975 | ||
9ed59592 | 4976 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
4977 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
4978 | ||
c255bd68 | 4979 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack); |
9ed59592 DA |
4980 | if (err < 0) |
4981 | goto errout; | |
4982 | } | |
4983 | ||
32bc201e XL |
4984 | if (tb[RTA_EXPIRES]) { |
4985 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
4986 | ||
4987 | if (addrconf_finite_timeout(timeout)) { | |
4988 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
4989 | cfg->fc_flags |= RTF_EXPIRES; | |
4990 | } | |
4991 | } | |
4992 | ||
86872cb5 TG |
4993 | err = 0; |
4994 | errout: | |
4995 | return err; | |
1da177e4 LT |
4996 | } |
4997 | ||
6b9ea5a6 | 4998 | struct rt6_nh { |
8d1c802b | 4999 | struct fib6_info *fib6_info; |
6b9ea5a6 | 5000 | struct fib6_config r_cfg; |
6b9ea5a6 RP |
5001 | struct list_head next; |
5002 | }; | |
5003 | ||
d4ead6b3 DA |
5004 | static int ip6_route_info_append(struct net *net, |
5005 | struct list_head *rt6_nh_list, | |
8d1c802b DA |
5006 | struct fib6_info *rt, |
5007 | struct fib6_config *r_cfg) | |
6b9ea5a6 RP |
5008 | { |
5009 | struct rt6_nh *nh; | |
6b9ea5a6 RP |
5010 | int err = -EEXIST; |
5011 | ||
5012 | list_for_each_entry(nh, rt6_nh_list, next) { | |
8d1c802b DA |
5013 | /* check if fib6_info already exists */ |
5014 | if (rt6_duplicate_nexthop(nh->fib6_info, rt)) | |
6b9ea5a6 RP |
5015 | return err; |
5016 | } | |
5017 | ||
5018 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
5019 | if (!nh) | |
5020 | return -ENOMEM; | |
8d1c802b | 5021 | nh->fib6_info = rt; |
6b9ea5a6 RP |
5022 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); |
5023 | list_add_tail(&nh->next, rt6_nh_list); | |
5024 | ||
5025 | return 0; | |
5026 | } | |
5027 | ||
8d1c802b DA |
5028 | static void ip6_route_mpath_notify(struct fib6_info *rt, |
5029 | struct fib6_info *rt_last, | |
3b1137fe DA |
5030 | struct nl_info *info, |
5031 | __u16 nlflags) | |
5032 | { | |
5033 | /* if this is an APPEND route, then rt points to the first route | |
5034 | * inserted and rt_last points to last route inserted. Userspace | |
5035 | * wants a consistent dump of the route which starts at the first | |
5036 | * nexthop. Since sibling routes are always added at the end of | |
5037 | * the list, find the first sibling of the last route appended | |
5038 | */ | |
93c2fb25 DA |
5039 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) { |
5040 | rt = list_first_entry(&rt_last->fib6_siblings, | |
8d1c802b | 5041 | struct fib6_info, |
93c2fb25 | 5042 | fib6_siblings); |
3b1137fe DA |
5043 | } |
5044 | ||
5045 | if (rt) | |
5046 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
5047 | } | |
5048 | ||
0ee0f47c IS |
5049 | static bool ip6_route_mpath_should_notify(const struct fib6_info *rt) |
5050 | { | |
5051 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); | |
5052 | bool should_notify = false; | |
5053 | struct fib6_info *leaf; | |
5054 | struct fib6_node *fn; | |
5055 | ||
5056 | rcu_read_lock(); | |
5057 | fn = rcu_dereference(rt->fib6_node); | |
5058 | if (!fn) | |
5059 | goto out; | |
5060 | ||
5061 | leaf = rcu_dereference(fn->leaf); | |
5062 | if (!leaf) | |
5063 | goto out; | |
5064 | ||
5065 | if (rt == leaf || | |
5066 | (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric && | |
5067 | rt6_qualify_for_ecmp(leaf))) | |
5068 | should_notify = true; | |
5069 | out: | |
5070 | rcu_read_unlock(); | |
5071 | ||
5072 | return should_notify; | |
5073 | } | |
5074 | ||
333c4301 DA |
5075 | static int ip6_route_multipath_add(struct fib6_config *cfg, |
5076 | struct netlink_ext_ack *extack) | |
51ebd318 | 5077 | { |
8d1c802b | 5078 | struct fib6_info *rt_notif = NULL, *rt_last = NULL; |
3b1137fe | 5079 | struct nl_info *info = &cfg->fc_nlinfo; |
51ebd318 ND |
5080 | struct fib6_config r_cfg; |
5081 | struct rtnexthop *rtnh; | |
8d1c802b | 5082 | struct fib6_info *rt; |
6b9ea5a6 RP |
5083 | struct rt6_nh *err_nh; |
5084 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 5085 | __u16 nlflags; |
51ebd318 ND |
5086 | int remaining; |
5087 | int attrlen; | |
6b9ea5a6 RP |
5088 | int err = 1; |
5089 | int nhn = 0; | |
5090 | int replace = (cfg->fc_nlinfo.nlh && | |
5091 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
5092 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 5093 | |
3b1137fe DA |
5094 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
5095 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
5096 | nlflags |= NLM_F_APPEND; | |
5097 | ||
35f1b4e9 | 5098 | remaining = cfg->fc_mp_len; |
51ebd318 | 5099 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 5100 | |
6b9ea5a6 | 5101 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
8d1c802b | 5102 | * fib6_info structs per nexthop |
6b9ea5a6 | 5103 | */ |
51ebd318 ND |
5104 | while (rtnh_ok(rtnh, remaining)) { |
5105 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5106 | if (rtnh->rtnh_ifindex) | |
5107 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5108 | ||
5109 | attrlen = rtnh_attrlen(rtnh); | |
5110 | if (attrlen > 0) { | |
5111 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5112 | ||
5113 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5114 | if (nla) { | |
67b61f6c | 5115 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
5116 | r_cfg.fc_flags |= RTF_GATEWAY; |
5117 | } | |
19e42e45 RP |
5118 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
5119 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
5120 | if (nla) | |
5121 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 5122 | } |
6b9ea5a6 | 5123 | |
68e2ffde | 5124 | r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK); |
acb54e3c | 5125 | rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack); |
8c5b83f0 RP |
5126 | if (IS_ERR(rt)) { |
5127 | err = PTR_ERR(rt); | |
5128 | rt = NULL; | |
6b9ea5a6 | 5129 | goto cleanup; |
8c5b83f0 | 5130 | } |
b5d2d75e DA |
5131 | if (!rt6_qualify_for_ecmp(rt)) { |
5132 | err = -EINVAL; | |
5133 | NL_SET_ERR_MSG(extack, | |
5134 | "Device only routes can not be added for IPv6 using the multipath API."); | |
5135 | fib6_info_release(rt); | |
5136 | goto cleanup; | |
5137 | } | |
6b9ea5a6 | 5138 | |
1cf844c7 | 5139 | rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1; |
398958ae | 5140 | |
d4ead6b3 DA |
5141 | err = ip6_route_info_append(info->nl_net, &rt6_nh_list, |
5142 | rt, &r_cfg); | |
51ebd318 | 5143 | if (err) { |
93531c67 | 5144 | fib6_info_release(rt); |
6b9ea5a6 RP |
5145 | goto cleanup; |
5146 | } | |
5147 | ||
5148 | rtnh = rtnh_next(rtnh, &remaining); | |
5149 | } | |
5150 | ||
9eee3b49 IS |
5151 | if (list_empty(&rt6_nh_list)) { |
5152 | NL_SET_ERR_MSG(extack, | |
5153 | "Invalid nexthop configuration - no valid nexthops"); | |
5154 | return -EINVAL; | |
5155 | } | |
5156 | ||
3b1137fe DA |
5157 | /* for add and replace send one notification with all nexthops. |
5158 | * Skip the notification in fib6_add_rt2node and send one with | |
5159 | * the full route when done | |
5160 | */ | |
5161 | info->skip_notify = 1; | |
5162 | ||
ebee3cad IS |
5163 | /* For add and replace, send one notification with all nexthops. For |
5164 | * append, send one notification with all appended nexthops. | |
5165 | */ | |
5166 | info->skip_notify_kernel = 1; | |
5167 | ||
6b9ea5a6 RP |
5168 | err_nh = NULL; |
5169 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
8d1c802b DA |
5170 | err = __ip6_ins_rt(nh->fib6_info, info, extack); |
5171 | fib6_info_release(nh->fib6_info); | |
93531c67 | 5172 | |
f7225172 DA |
5173 | if (!err) { |
5174 | /* save reference to last route successfully inserted */ | |
5175 | rt_last = nh->fib6_info; | |
5176 | ||
5177 | /* save reference to first route for notification */ | |
5178 | if (!rt_notif) | |
5179 | rt_notif = nh->fib6_info; | |
5180 | } | |
3b1137fe | 5181 | |
8d1c802b DA |
5182 | /* nh->fib6_info is used or freed at this point, reset to NULL*/ |
5183 | nh->fib6_info = NULL; | |
6b9ea5a6 RP |
5184 | if (err) { |
5185 | if (replace && nhn) | |
a5a82d84 JK |
5186 | NL_SET_ERR_MSG_MOD(extack, |
5187 | "multipath route replace failed (check consistency of installed routes)"); | |
6b9ea5a6 RP |
5188 | err_nh = nh; |
5189 | goto add_errout; | |
51ebd318 | 5190 | } |
6b9ea5a6 | 5191 | |
1a72418b | 5192 | /* Because each route is added like a single route we remove |
27596472 MK |
5193 | * these flags after the first nexthop: if there is a collision, |
5194 | * we have already failed to add the first nexthop: | |
5195 | * fib6_add_rt2node() has rejected it; when replacing, old | |
5196 | * nexthops have been replaced by first new, the rest should | |
5197 | * be added to it. | |
1a72418b | 5198 | */ |
27596472 MK |
5199 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
5200 | NLM_F_REPLACE); | |
afecdb37 | 5201 | cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE; |
6b9ea5a6 RP |
5202 | nhn++; |
5203 | } | |
5204 | ||
0ee0f47c IS |
5205 | /* An in-kernel notification should only be sent in case the new |
5206 | * multipath route is added as the first route in the node, or if | |
5207 | * it was appended to it. We pass 'rt_notif' since it is the first | |
5208 | * sibling and might allow us to skip some checks in the replace case. | |
5209 | */ | |
5210 | if (ip6_route_mpath_should_notify(rt_notif)) { | |
5211 | enum fib_event_type fib_event; | |
5212 | ||
5213 | if (rt_notif->fib6_nsiblings != nhn - 1) | |
5214 | fib_event = FIB_EVENT_ENTRY_APPEND; | |
5215 | else | |
caafb250 | 5216 | fib_event = FIB_EVENT_ENTRY_REPLACE; |
0ee0f47c IS |
5217 | |
5218 | err = call_fib6_multipath_entry_notifiers(info->nl_net, | |
5219 | fib_event, rt_notif, | |
5220 | nhn - 1, extack); | |
5221 | if (err) { | |
5222 | /* Delete all the siblings that were just added */ | |
5223 | err_nh = NULL; | |
5224 | goto add_errout; | |
5225 | } | |
5226 | } | |
ebee3cad | 5227 | |
3b1137fe DA |
5228 | /* success ... tell user about new route */ |
5229 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
5230 | goto cleanup; |
5231 | ||
5232 | add_errout: | |
3b1137fe DA |
5233 | /* send notification for routes that were added so that |
5234 | * the delete notifications sent by ip6_route_del are | |
5235 | * coherent | |
5236 | */ | |
5237 | if (rt_notif) | |
5238 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
5239 | ||
6b9ea5a6 RP |
5240 | /* Delete routes that were already added */ |
5241 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
5242 | if (err_nh == nh) | |
5243 | break; | |
333c4301 | 5244 | ip6_route_del(&nh->r_cfg, extack); |
6b9ea5a6 RP |
5245 | } |
5246 | ||
5247 | cleanup: | |
5248 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
8d1c802b DA |
5249 | if (nh->fib6_info) |
5250 | fib6_info_release(nh->fib6_info); | |
6b9ea5a6 RP |
5251 | list_del(&nh->next); |
5252 | kfree(nh); | |
5253 | } | |
5254 | ||
5255 | return err; | |
5256 | } | |
5257 | ||
333c4301 DA |
5258 | static int ip6_route_multipath_del(struct fib6_config *cfg, |
5259 | struct netlink_ext_ack *extack) | |
6b9ea5a6 RP |
5260 | { |
5261 | struct fib6_config r_cfg; | |
5262 | struct rtnexthop *rtnh; | |
5263 | int remaining; | |
5264 | int attrlen; | |
5265 | int err = 1, last_err = 0; | |
5266 | ||
5267 | remaining = cfg->fc_mp_len; | |
5268 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
5269 | ||
5270 | /* Parse a Multipath Entry */ | |
5271 | while (rtnh_ok(rtnh, remaining)) { | |
5272 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
5273 | if (rtnh->rtnh_ifindex) | |
5274 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
5275 | ||
5276 | attrlen = rtnh_attrlen(rtnh); | |
5277 | if (attrlen > 0) { | |
5278 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
5279 | ||
5280 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
5281 | if (nla) { | |
5282 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
5283 | r_cfg.fc_flags |= RTF_GATEWAY; | |
5284 | } | |
5285 | } | |
333c4301 | 5286 | err = ip6_route_del(&r_cfg, extack); |
6b9ea5a6 RP |
5287 | if (err) |
5288 | last_err = err; | |
5289 | ||
51ebd318 ND |
5290 | rtnh = rtnh_next(rtnh, &remaining); |
5291 | } | |
5292 | ||
5293 | return last_err; | |
5294 | } | |
5295 | ||
c21ef3e3 DA |
5296 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5297 | struct netlink_ext_ack *extack) | |
1da177e4 | 5298 | { |
86872cb5 TG |
5299 | struct fib6_config cfg; |
5300 | int err; | |
1da177e4 | 5301 | |
333c4301 | 5302 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5303 | if (err < 0) |
5304 | return err; | |
5305 | ||
5b98324e DA |
5306 | if (cfg.fc_nh_id && |
5307 | !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) { | |
5308 | NL_SET_ERR_MSG(extack, "Nexthop id does not exist"); | |
5309 | return -EINVAL; | |
5310 | } | |
5311 | ||
51ebd318 | 5312 | if (cfg.fc_mp) |
333c4301 | 5313 | return ip6_route_multipath_del(&cfg, extack); |
0ae81335 DA |
5314 | else { |
5315 | cfg.fc_delete_all_nh = 1; | |
333c4301 | 5316 | return ip6_route_del(&cfg, extack); |
0ae81335 | 5317 | } |
1da177e4 LT |
5318 | } |
5319 | ||
c21ef3e3 DA |
5320 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
5321 | struct netlink_ext_ack *extack) | |
1da177e4 | 5322 | { |
86872cb5 TG |
5323 | struct fib6_config cfg; |
5324 | int err; | |
1da177e4 | 5325 | |
333c4301 | 5326 | err = rtm_to_fib6_config(skb, nlh, &cfg, extack); |
86872cb5 TG |
5327 | if (err < 0) |
5328 | return err; | |
5329 | ||
67f69513 DA |
5330 | if (cfg.fc_metric == 0) |
5331 | cfg.fc_metric = IP6_RT_PRIO_USER; | |
5332 | ||
51ebd318 | 5333 | if (cfg.fc_mp) |
333c4301 | 5334 | return ip6_route_multipath_add(&cfg, extack); |
51ebd318 | 5335 | else |
acb54e3c | 5336 | return ip6_route_add(&cfg, GFP_KERNEL, extack); |
1da177e4 LT |
5337 | } |
5338 | ||
a1b7a1f0 DA |
5339 | /* add the overhead of this fib6_nh to nexthop_len */ |
5340 | static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg) | |
339bf98f | 5341 | { |
a1b7a1f0 | 5342 | int *nexthop_len = arg; |
beb1afac | 5343 | |
a1b7a1f0 DA |
5344 | *nexthop_len += nla_total_size(0) /* RTA_MULTIPATH */ |
5345 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5346 | + nla_total_size(16); /* RTA_GATEWAY */ | |
5347 | ||
5348 | if (nh->fib_nh_lws) { | |
5349 | /* RTA_ENCAP_TYPE */ | |
5350 | *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5351 | /* RTA_ENCAP */ | |
5352 | *nexthop_len += nla_total_size(2); | |
5353 | } | |
f88d8ea6 | 5354 | |
a1b7a1f0 DA |
5355 | return 0; |
5356 | } | |
beb1afac | 5357 | |
a1b7a1f0 DA |
5358 | static size_t rt6_nlmsg_size(struct fib6_info *f6i) |
5359 | { | |
5360 | int nexthop_len; | |
5361 | ||
5362 | if (f6i->nh) { | |
5363 | nexthop_len = nla_total_size(4); /* RTA_NH_ID */ | |
5364 | nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size, | |
5365 | &nexthop_len); | |
5366 | } else { | |
5367 | struct fib6_nh *nh = f6i->fib6_nh; | |
5368 | ||
5369 | nexthop_len = 0; | |
5370 | if (f6i->fib6_nsiblings) { | |
5371 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
5372 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
5373 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5374 | + lwtunnel_get_encap_size(nh->fib_nh_lws); | |
5375 | ||
5376 | nexthop_len *= f6i->fib6_nsiblings; | |
5377 | } | |
5378 | nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws); | |
beb1afac DA |
5379 | } |
5380 | ||
339bf98f TG |
5381 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
5382 | + nla_total_size(16) /* RTA_SRC */ | |
5383 | + nla_total_size(16) /* RTA_DST */ | |
5384 | + nla_total_size(16) /* RTA_GATEWAY */ | |
5385 | + nla_total_size(16) /* RTA_PREFSRC */ | |
5386 | + nla_total_size(4) /* RTA_TABLE */ | |
5387 | + nla_total_size(4) /* RTA_IIF */ | |
5388 | + nla_total_size(4) /* RTA_OIF */ | |
5389 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 5390 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 5391 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 5392 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 5393 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
5394 | + nexthop_len; |
5395 | } | |
5396 | ||
f88d8ea6 DA |
5397 | static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh, |
5398 | unsigned char *flags) | |
5399 | { | |
5400 | if (nexthop_is_multipath(nh)) { | |
5401 | struct nlattr *mp; | |
5402 | ||
4255ff05 | 5403 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
f88d8ea6 DA |
5404 | if (!mp) |
5405 | goto nla_put_failure; | |
5406 | ||
7bdf4de1 | 5407 | if (nexthop_mpath_fill_node(skb, nh, AF_INET6)) |
f88d8ea6 DA |
5408 | goto nla_put_failure; |
5409 | ||
5410 | nla_nest_end(skb, mp); | |
5411 | } else { | |
5412 | struct fib6_nh *fib6_nh; | |
5413 | ||
5414 | fib6_nh = nexthop_fib6_nh(nh); | |
7bdf4de1 | 5415 | if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6, |
f88d8ea6 DA |
5416 | flags, false) < 0) |
5417 | goto nla_put_failure; | |
5418 | } | |
5419 | ||
5420 | return 0; | |
5421 | ||
5422 | nla_put_failure: | |
5423 | return -EMSGSIZE; | |
5424 | } | |
5425 | ||
d4ead6b3 | 5426 | static int rt6_fill_node(struct net *net, struct sk_buff *skb, |
8d1c802b | 5427 | struct fib6_info *rt, struct dst_entry *dst, |
d4ead6b3 | 5428 | struct in6_addr *dest, struct in6_addr *src, |
15e47304 | 5429 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 5430 | unsigned int flags) |
1da177e4 | 5431 | { |
22d0bd82 XL |
5432 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
5433 | struct rt6key *rt6_dst, *rt6_src; | |
5434 | u32 *pmetrics, table, rt6_flags; | |
f88d8ea6 | 5435 | unsigned char nh_flags = 0; |
2d7202bf | 5436 | struct nlmsghdr *nlh; |
22d0bd82 | 5437 | struct rtmsg *rtm; |
d4ead6b3 | 5438 | long expires = 0; |
1da177e4 | 5439 | |
15e47304 | 5440 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 5441 | if (!nlh) |
26932566 | 5442 | return -EMSGSIZE; |
2d7202bf | 5443 | |
22d0bd82 XL |
5444 | if (rt6) { |
5445 | rt6_dst = &rt6->rt6i_dst; | |
5446 | rt6_src = &rt6->rt6i_src; | |
5447 | rt6_flags = rt6->rt6i_flags; | |
5448 | } else { | |
5449 | rt6_dst = &rt->fib6_dst; | |
5450 | rt6_src = &rt->fib6_src; | |
5451 | rt6_flags = rt->fib6_flags; | |
5452 | } | |
5453 | ||
2d7202bf | 5454 | rtm = nlmsg_data(nlh); |
1da177e4 | 5455 | rtm->rtm_family = AF_INET6; |
22d0bd82 XL |
5456 | rtm->rtm_dst_len = rt6_dst->plen; |
5457 | rtm->rtm_src_len = rt6_src->plen; | |
1da177e4 | 5458 | rtm->rtm_tos = 0; |
93c2fb25 DA |
5459 | if (rt->fib6_table) |
5460 | table = rt->fib6_table->tb6_id; | |
c71099ac | 5461 | else |
9e762a4a | 5462 | table = RT6_TABLE_UNSPEC; |
97f0082a | 5463 | rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT; |
c78679e8 DM |
5464 | if (nla_put_u32(skb, RTA_TABLE, table)) |
5465 | goto nla_put_failure; | |
e8478e80 DA |
5466 | |
5467 | rtm->rtm_type = rt->fib6_type; | |
1da177e4 LT |
5468 | rtm->rtm_flags = 0; |
5469 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
93c2fb25 | 5470 | rtm->rtm_protocol = rt->fib6_protocol; |
1da177e4 | 5471 | |
22d0bd82 | 5472 | if (rt6_flags & RTF_CACHE) |
1da177e4 LT |
5473 | rtm->rtm_flags |= RTM_F_CLONED; |
5474 | ||
d4ead6b3 DA |
5475 | if (dest) { |
5476 | if (nla_put_in6_addr(skb, RTA_DST, dest)) | |
c78679e8 | 5477 | goto nla_put_failure; |
1ab1457c | 5478 | rtm->rtm_dst_len = 128; |
1da177e4 | 5479 | } else if (rtm->rtm_dst_len) |
22d0bd82 | 5480 | if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr)) |
c78679e8 | 5481 | goto nla_put_failure; |
1da177e4 LT |
5482 | #ifdef CONFIG_IPV6_SUBTREES |
5483 | if (src) { | |
930345ea | 5484 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 5485 | goto nla_put_failure; |
1ab1457c | 5486 | rtm->rtm_src_len = 128; |
c78679e8 | 5487 | } else if (rtm->rtm_src_len && |
22d0bd82 | 5488 | nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr)) |
c78679e8 | 5489 | goto nla_put_failure; |
1da177e4 | 5490 | #endif |
7bc570c8 YH |
5491 | if (iif) { |
5492 | #ifdef CONFIG_IPV6_MROUTE | |
22d0bd82 | 5493 | if (ipv6_addr_is_multicast(&rt6_dst->addr)) { |
fd61c6ba DA |
5494 | int err = ip6mr_get_route(net, skb, rtm, portid); |
5495 | ||
5496 | if (err == 0) | |
5497 | return 0; | |
5498 | if (err < 0) | |
5499 | goto nla_put_failure; | |
7bc570c8 YH |
5500 | } else |
5501 | #endif | |
c78679e8 DM |
5502 | if (nla_put_u32(skb, RTA_IIF, iif)) |
5503 | goto nla_put_failure; | |
d4ead6b3 | 5504 | } else if (dest) { |
1da177e4 | 5505 | struct in6_addr saddr_buf; |
d4ead6b3 | 5506 | if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 && |
930345ea | 5507 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5508 | goto nla_put_failure; |
1da177e4 | 5509 | } |
2d7202bf | 5510 | |
93c2fb25 | 5511 | if (rt->fib6_prefsrc.plen) { |
c3968a85 | 5512 | struct in6_addr saddr_buf; |
93c2fb25 | 5513 | saddr_buf = rt->fib6_prefsrc.addr; |
930345ea | 5514 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 5515 | goto nla_put_failure; |
c3968a85 DW |
5516 | } |
5517 | ||
d4ead6b3 DA |
5518 | pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics; |
5519 | if (rtnetlink_put_metrics(skb, pmetrics) < 0) | |
2d7202bf TG |
5520 | goto nla_put_failure; |
5521 | ||
93c2fb25 | 5522 | if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric)) |
c78679e8 | 5523 | goto nla_put_failure; |
8253947e | 5524 | |
beb1afac DA |
5525 | /* For multipath routes, walk the siblings list and add |
5526 | * each as a nexthop within RTA_MULTIPATH. | |
5527 | */ | |
22d0bd82 XL |
5528 | if (rt6) { |
5529 | if (rt6_flags & RTF_GATEWAY && | |
5530 | nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway)) | |
5531 | goto nla_put_failure; | |
5532 | ||
5533 | if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex)) | |
5534 | goto nla_put_failure; | |
5535 | } else if (rt->fib6_nsiblings) { | |
8d1c802b | 5536 | struct fib6_info *sibling, *next_sibling; |
beb1afac DA |
5537 | struct nlattr *mp; |
5538 | ||
ae0be8de | 5539 | mp = nla_nest_start_noflag(skb, RTA_MULTIPATH); |
beb1afac DA |
5540 | if (!mp) |
5541 | goto nla_put_failure; | |
5542 | ||
1cf844c7 | 5543 | if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common, |
7bdf4de1 | 5544 | rt->fib6_nh->fib_nh_weight, AF_INET6) < 0) |
beb1afac DA |
5545 | goto nla_put_failure; |
5546 | ||
5547 | list_for_each_entry_safe(sibling, next_sibling, | |
93c2fb25 | 5548 | &rt->fib6_siblings, fib6_siblings) { |
1cf844c7 | 5549 | if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common, |
7bdf4de1 DS |
5550 | sibling->fib6_nh->fib_nh_weight, |
5551 | AF_INET6) < 0) | |
beb1afac DA |
5552 | goto nla_put_failure; |
5553 | } | |
5554 | ||
5555 | nla_nest_end(skb, mp); | |
f88d8ea6 DA |
5556 | } else if (rt->nh) { |
5557 | if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id)) | |
5558 | goto nla_put_failure; | |
ecc5663c | 5559 | |
f88d8ea6 DA |
5560 | if (nexthop_is_blackhole(rt->nh)) |
5561 | rtm->rtm_type = RTN_BLACKHOLE; | |
5562 | ||
5563 | if (rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0) | |
5564 | goto nla_put_failure; | |
5565 | ||
5566 | rtm->rtm_flags |= nh_flags; | |
5567 | } else { | |
7bdf4de1 | 5568 | if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6, |
ecc5663c | 5569 | &nh_flags, false) < 0) |
beb1afac | 5570 | goto nla_put_failure; |
ecc5663c DA |
5571 | |
5572 | rtm->rtm_flags |= nh_flags; | |
beb1afac DA |
5573 | } |
5574 | ||
22d0bd82 | 5575 | if (rt6_flags & RTF_EXPIRES) { |
14895687 DA |
5576 | expires = dst ? dst->expires : rt->expires; |
5577 | expires -= jiffies; | |
5578 | } | |
69cdf8f9 | 5579 | |
bb3c4ab9 IS |
5580 | if (!dst) { |
5581 | if (rt->offload) | |
5582 | rtm->rtm_flags |= RTM_F_OFFLOAD; | |
5583 | if (rt->trap) | |
5584 | rtm->rtm_flags |= RTM_F_TRAP; | |
5585 | } | |
5586 | ||
d4ead6b3 | 5587 | if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0) |
e3703b3d | 5588 | goto nla_put_failure; |
2d7202bf | 5589 | |
22d0bd82 | 5590 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags))) |
c78ba6d6 LR |
5591 | goto nla_put_failure; |
5592 | ||
19e42e45 | 5593 | |
053c095a JB |
5594 | nlmsg_end(skb, nlh); |
5595 | return 0; | |
2d7202bf TG |
5596 | |
5597 | nla_put_failure: | |
26932566 PM |
5598 | nlmsg_cancel(skb, nlh); |
5599 | return -EMSGSIZE; | |
1da177e4 LT |
5600 | } |
5601 | ||
2c170e07 DA |
5602 | static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg) |
5603 | { | |
5604 | const struct net_device *dev = arg; | |
5605 | ||
5606 | if (nh->fib_nh_dev == dev) | |
5607 | return 1; | |
5608 | ||
5609 | return 0; | |
5610 | } | |
5611 | ||
13e38901 DA |
5612 | static bool fib6_info_uses_dev(const struct fib6_info *f6i, |
5613 | const struct net_device *dev) | |
5614 | { | |
2c170e07 DA |
5615 | if (f6i->nh) { |
5616 | struct net_device *_dev = (struct net_device *)dev; | |
5617 | ||
5618 | return !!nexthop_for_each_fib6_nh(f6i->nh, | |
5619 | fib6_info_nh_uses_dev, | |
5620 | _dev); | |
5621 | } | |
5622 | ||
1cf844c7 | 5623 | if (f6i->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5624 | return true; |
5625 | ||
5626 | if (f6i->fib6_nsiblings) { | |
5627 | struct fib6_info *sibling, *next_sibling; | |
5628 | ||
5629 | list_for_each_entry_safe(sibling, next_sibling, | |
5630 | &f6i->fib6_siblings, fib6_siblings) { | |
1cf844c7 | 5631 | if (sibling->fib6_nh->fib_nh_dev == dev) |
13e38901 DA |
5632 | return true; |
5633 | } | |
5634 | } | |
5635 | ||
5636 | return false; | |
5637 | } | |
5638 | ||
1e47b483 SB |
5639 | struct fib6_nh_exception_dump_walker { |
5640 | struct rt6_rtnl_dump_arg *dump; | |
5641 | struct fib6_info *rt; | |
5642 | unsigned int flags; | |
5643 | unsigned int skip; | |
5644 | unsigned int count; | |
5645 | }; | |
5646 | ||
5647 | static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg) | |
5648 | { | |
5649 | struct fib6_nh_exception_dump_walker *w = arg; | |
5650 | struct rt6_rtnl_dump_arg *dump = w->dump; | |
5651 | struct rt6_exception_bucket *bucket; | |
5652 | struct rt6_exception *rt6_ex; | |
5653 | int i, err; | |
5654 | ||
5655 | bucket = fib6_nh_get_excptn_bucket(nh, NULL); | |
5656 | if (!bucket) | |
5657 | return 0; | |
5658 | ||
5659 | for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) { | |
5660 | hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) { | |
5661 | if (w->skip) { | |
5662 | w->skip--; | |
5663 | continue; | |
5664 | } | |
5665 | ||
5666 | /* Expiration of entries doesn't bump sernum, insertion | |
5667 | * does. Removal is triggered by insertion, so we can | |
5668 | * rely on the fact that if entries change between two | |
5669 | * partial dumps, this node is scanned again completely, | |
5670 | * see rt6_insert_exception() and fib6_dump_table(). | |
5671 | * | |
5672 | * Count expired entries we go through as handled | |
5673 | * entries that we'll skip next time, in case of partial | |
5674 | * node dump. Otherwise, if entries expire meanwhile, | |
5675 | * we'll skip the wrong amount. | |
5676 | */ | |
5677 | if (rt6_check_expired(rt6_ex->rt6i)) { | |
5678 | w->count++; | |
5679 | continue; | |
5680 | } | |
5681 | ||
5682 | err = rt6_fill_node(dump->net, dump->skb, w->rt, | |
5683 | &rt6_ex->rt6i->dst, NULL, NULL, 0, | |
5684 | RTM_NEWROUTE, | |
5685 | NETLINK_CB(dump->cb->skb).portid, | |
5686 | dump->cb->nlh->nlmsg_seq, w->flags); | |
5687 | if (err) | |
5688 | return err; | |
5689 | ||
5690 | w->count++; | |
5691 | } | |
5692 | bucket++; | |
5693 | } | |
5694 | ||
5695 | return 0; | |
5696 | } | |
5697 | ||
bf9a8a06 | 5698 | /* Return -1 if done with node, number of handled routes on partial dump */ |
1e47b483 | 5699 | int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip) |
1da177e4 LT |
5700 | { |
5701 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
13e38901 DA |
5702 | struct fib_dump_filter *filter = &arg->filter; |
5703 | unsigned int flags = NLM_F_MULTI; | |
1f17e2f2 | 5704 | struct net *net = arg->net; |
1e47b483 | 5705 | int count = 0; |
1f17e2f2 | 5706 | |
421842ed | 5707 | if (rt == net->ipv6.fib6_null_entry) |
bf9a8a06 | 5708 | return -1; |
1da177e4 | 5709 | |
13e38901 DA |
5710 | if ((filter->flags & RTM_F_PREFIX) && |
5711 | !(rt->fib6_flags & RTF_PREFIX_RT)) { | |
5712 | /* success since this is not a prefix route */ | |
bf9a8a06 | 5713 | return -1; |
13e38901 | 5714 | } |
1e47b483 SB |
5715 | if (filter->filter_set && |
5716 | ((filter->rt_type && rt->fib6_type != filter->rt_type) || | |
5717 | (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) || | |
5718 | (filter->protocol && rt->fib6_protocol != filter->protocol))) { | |
5719 | return -1; | |
5720 | } | |
5721 | ||
5722 | if (filter->filter_set || | |
5723 | !filter->dump_routes || !filter->dump_exceptions) { | |
13e38901 | 5724 | flags |= NLM_F_DUMP_FILTERED; |
f8cfe2ce | 5725 | } |
1da177e4 | 5726 | |
1e47b483 SB |
5727 | if (filter->dump_routes) { |
5728 | if (skip) { | |
5729 | skip--; | |
5730 | } else { | |
5731 | if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, | |
5732 | 0, RTM_NEWROUTE, | |
5733 | NETLINK_CB(arg->cb->skb).portid, | |
5734 | arg->cb->nlh->nlmsg_seq, flags)) { | |
5735 | return 0; | |
5736 | } | |
5737 | count++; | |
5738 | } | |
5739 | } | |
5740 | ||
5741 | if (filter->dump_exceptions) { | |
5742 | struct fib6_nh_exception_dump_walker w = { .dump = arg, | |
5743 | .rt = rt, | |
5744 | .flags = flags, | |
5745 | .skip = skip, | |
5746 | .count = 0 }; | |
5747 | int err; | |
5748 | ||
3b525691 | 5749 | rcu_read_lock(); |
1e47b483 SB |
5750 | if (rt->nh) { |
5751 | err = nexthop_for_each_fib6_nh(rt->nh, | |
5752 | rt6_nh_dump_exceptions, | |
5753 | &w); | |
5754 | } else { | |
5755 | err = rt6_nh_dump_exceptions(rt->fib6_nh, &w); | |
5756 | } | |
3b525691 | 5757 | rcu_read_unlock(); |
1e47b483 SB |
5758 | |
5759 | if (err) | |
5760 | return count += w.count; | |
5761 | } | |
bf9a8a06 SB |
5762 | |
5763 | return -1; | |
1da177e4 LT |
5764 | } |
5765 | ||
0eff0a27 JK |
5766 | static int inet6_rtm_valid_getroute_req(struct sk_buff *skb, |
5767 | const struct nlmsghdr *nlh, | |
5768 | struct nlattr **tb, | |
5769 | struct netlink_ext_ack *extack) | |
5770 | { | |
5771 | struct rtmsg *rtm; | |
5772 | int i, err; | |
5773 | ||
5774 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
5775 | NL_SET_ERR_MSG_MOD(extack, | |
5776 | "Invalid header for get route request"); | |
5777 | return -EINVAL; | |
5778 | } | |
5779 | ||
5780 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
5781 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
5782 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5783 | |
5784 | rtm = nlmsg_data(nlh); | |
5785 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) || | |
5786 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) || | |
5787 | rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope || | |
5788 | rtm->rtm_type) { | |
5789 | NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request"); | |
5790 | return -EINVAL; | |
5791 | } | |
5792 | if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) { | |
5793 | NL_SET_ERR_MSG_MOD(extack, | |
5794 | "Invalid flags for get route request"); | |
5795 | return -EINVAL; | |
5796 | } | |
5797 | ||
8cb08174 JB |
5798 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
5799 | rtm_ipv6_policy, extack); | |
0eff0a27 JK |
5800 | if (err) |
5801 | return err; | |
5802 | ||
5803 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
5804 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
5805 | NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6"); | |
5806 | return -EINVAL; | |
5807 | } | |
5808 | ||
5809 | for (i = 0; i <= RTA_MAX; i++) { | |
5810 | if (!tb[i]) | |
5811 | continue; | |
5812 | ||
5813 | switch (i) { | |
5814 | case RTA_SRC: | |
5815 | case RTA_DST: | |
5816 | case RTA_IIF: | |
5817 | case RTA_OIF: | |
5818 | case RTA_MARK: | |
5819 | case RTA_UID: | |
5820 | case RTA_SPORT: | |
5821 | case RTA_DPORT: | |
5822 | case RTA_IP_PROTO: | |
5823 | break; | |
5824 | default: | |
5825 | NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request"); | |
5826 | return -EINVAL; | |
5827 | } | |
5828 | } | |
5829 | ||
5830 | return 0; | |
5831 | } | |
5832 | ||
c21ef3e3 DA |
5833 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
5834 | struct netlink_ext_ack *extack) | |
1da177e4 | 5835 | { |
3b1e0a65 | 5836 | struct net *net = sock_net(in_skb->sk); |
ab364a6f | 5837 | struct nlattr *tb[RTA_MAX+1]; |
18c3a61c | 5838 | int err, iif = 0, oif = 0; |
a68886a6 | 5839 | struct fib6_info *from; |
18c3a61c | 5840 | struct dst_entry *dst; |
ab364a6f | 5841 | struct rt6_info *rt; |
1da177e4 | 5842 | struct sk_buff *skb; |
ab364a6f | 5843 | struct rtmsg *rtm; |
744486d4 | 5844 | struct flowi6 fl6 = {}; |
18c3a61c | 5845 | bool fibmatch; |
1da177e4 | 5846 | |
0eff0a27 | 5847 | err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
ab364a6f TG |
5848 | if (err < 0) |
5849 | goto errout; | |
1da177e4 | 5850 | |
ab364a6f | 5851 | err = -EINVAL; |
38b7097b HFS |
5852 | rtm = nlmsg_data(nlh); |
5853 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
18c3a61c | 5854 | fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH); |
1da177e4 | 5855 | |
ab364a6f TG |
5856 | if (tb[RTA_SRC]) { |
5857 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
5858 | goto errout; | |
5859 | ||
4e3fd7a0 | 5860 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
5861 | } |
5862 | ||
5863 | if (tb[RTA_DST]) { | |
5864 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
5865 | goto errout; | |
5866 | ||
4e3fd7a0 | 5867 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
5868 | } |
5869 | ||
5870 | if (tb[RTA_IIF]) | |
5871 | iif = nla_get_u32(tb[RTA_IIF]); | |
5872 | ||
5873 | if (tb[RTA_OIF]) | |
72331bc0 | 5874 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 5875 | |
2e47b291 LC |
5876 | if (tb[RTA_MARK]) |
5877 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
5878 | ||
622ec2c9 LC |
5879 | if (tb[RTA_UID]) |
5880 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
5881 | nla_get_u32(tb[RTA_UID])); | |
5882 | else | |
5883 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
5884 | ||
eacb9384 RP |
5885 | if (tb[RTA_SPORT]) |
5886 | fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]); | |
5887 | ||
5888 | if (tb[RTA_DPORT]) | |
5889 | fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]); | |
5890 | ||
5891 | if (tb[RTA_IP_PROTO]) { | |
5892 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea HL |
5893 | &fl6.flowi6_proto, AF_INET6, |
5894 | extack); | |
eacb9384 RP |
5895 | if (err) |
5896 | goto errout; | |
5897 | } | |
5898 | ||
1da177e4 LT |
5899 | if (iif) { |
5900 | struct net_device *dev; | |
72331bc0 SL |
5901 | int flags = 0; |
5902 | ||
121622db FW |
5903 | rcu_read_lock(); |
5904 | ||
5905 | dev = dev_get_by_index_rcu(net, iif); | |
1da177e4 | 5906 | if (!dev) { |
121622db | 5907 | rcu_read_unlock(); |
1da177e4 | 5908 | err = -ENODEV; |
ab364a6f | 5909 | goto errout; |
1da177e4 | 5910 | } |
72331bc0 SL |
5911 | |
5912 | fl6.flowi6_iif = iif; | |
5913 | ||
5914 | if (!ipv6_addr_any(&fl6.saddr)) | |
5915 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
5916 | ||
b75cc8f9 | 5917 | dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags); |
121622db FW |
5918 | |
5919 | rcu_read_unlock(); | |
72331bc0 SL |
5920 | } else { |
5921 | fl6.flowi6_oif = oif; | |
5922 | ||
58acfd71 | 5923 | dst = ip6_route_output(net, NULL, &fl6); |
18c3a61c RP |
5924 | } |
5925 | ||
18c3a61c RP |
5926 | |
5927 | rt = container_of(dst, struct rt6_info, dst); | |
5928 | if (rt->dst.error) { | |
5929 | err = rt->dst.error; | |
5930 | ip6_rt_put(rt); | |
5931 | goto errout; | |
1da177e4 LT |
5932 | } |
5933 | ||
9d6acb3b WC |
5934 | if (rt == net->ipv6.ip6_null_entry) { |
5935 | err = rt->dst.error; | |
5936 | ip6_rt_put(rt); | |
5937 | goto errout; | |
5938 | } | |
5939 | ||
ab364a6f | 5940 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 5941 | if (!skb) { |
94e187c0 | 5942 | ip6_rt_put(rt); |
ab364a6f TG |
5943 | err = -ENOBUFS; |
5944 | goto errout; | |
5945 | } | |
1da177e4 | 5946 | |
d8d1f30b | 5947 | skb_dst_set(skb, &rt->dst); |
a68886a6 DA |
5948 | |
5949 | rcu_read_lock(); | |
5950 | from = rcu_dereference(rt->from); | |
886b7a50 MKL |
5951 | if (from) { |
5952 | if (fibmatch) | |
5953 | err = rt6_fill_node(net, skb, from, NULL, NULL, NULL, | |
5954 | iif, RTM_NEWROUTE, | |
5955 | NETLINK_CB(in_skb).portid, | |
5956 | nlh->nlmsg_seq, 0); | |
5957 | else | |
5958 | err = rt6_fill_node(net, skb, from, dst, &fl6.daddr, | |
5959 | &fl6.saddr, iif, RTM_NEWROUTE, | |
5960 | NETLINK_CB(in_skb).portid, | |
5961 | nlh->nlmsg_seq, 0); | |
5962 | } else { | |
5963 | err = -ENETUNREACH; | |
5964 | } | |
a68886a6 DA |
5965 | rcu_read_unlock(); |
5966 | ||
1da177e4 | 5967 | if (err < 0) { |
ab364a6f TG |
5968 | kfree_skb(skb); |
5969 | goto errout; | |
1da177e4 LT |
5970 | } |
5971 | ||
15e47304 | 5972 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 5973 | errout: |
1da177e4 | 5974 | return err; |
1da177e4 LT |
5975 | } |
5976 | ||
8d1c802b | 5977 | void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info, |
37a1d361 | 5978 | unsigned int nlm_flags) |
1da177e4 LT |
5979 | { |
5980 | struct sk_buff *skb; | |
5578689a | 5981 | struct net *net = info->nl_net; |
528c4ceb DL |
5982 | u32 seq; |
5983 | int err; | |
5984 | ||
5985 | err = -ENOBUFS; | |
38308473 | 5986 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 5987 | |
19e42e45 | 5988 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 5989 | if (!skb) |
21713ebc TG |
5990 | goto errout; |
5991 | ||
d4ead6b3 DA |
5992 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, |
5993 | event, info->portid, seq, nlm_flags); | |
26932566 PM |
5994 | if (err < 0) { |
5995 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
5996 | WARN_ON(err == -EMSGSIZE); | |
5997 | kfree_skb(skb); | |
5998 | goto errout; | |
5999 | } | |
15e47304 | 6000 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
6001 | info->nlh, gfp_any()); |
6002 | return; | |
21713ebc TG |
6003 | errout: |
6004 | if (err < 0) | |
5578689a | 6005 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
6006 | } |
6007 | ||
19a3b7ee DA |
6008 | void fib6_rt_update(struct net *net, struct fib6_info *rt, |
6009 | struct nl_info *info) | |
6010 | { | |
6011 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
6012 | struct sk_buff *skb; | |
6013 | int err = -ENOBUFS; | |
6014 | ||
6015 | /* call_fib6_entry_notifiers will be removed when in-kernel notifier | |
6016 | * is implemented and supported for nexthop objects | |
6017 | */ | |
6018 | call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_REPLACE, rt, NULL); | |
6019 | ||
6020 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
6021 | if (!skb) | |
6022 | goto errout; | |
6023 | ||
6024 | err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0, | |
6025 | RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE); | |
6026 | if (err < 0) { | |
6027 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
6028 | WARN_ON(err == -EMSGSIZE); | |
6029 | kfree_skb(skb); | |
6030 | goto errout; | |
6031 | } | |
6032 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, | |
6033 | info->nlh, gfp_any()); | |
6034 | return; | |
6035 | errout: | |
6036 | if (err < 0) | |
6037 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); | |
6038 | } | |
6039 | ||
8ed67789 | 6040 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 6041 | unsigned long event, void *ptr) |
8ed67789 | 6042 | { |
351638e7 | 6043 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 6044 | struct net *net = dev_net(dev); |
8ed67789 | 6045 | |
242d3a49 WC |
6046 | if (!(dev->flags & IFF_LOOPBACK)) |
6047 | return NOTIFY_OK; | |
6048 | ||
6049 | if (event == NETDEV_REGISTER) { | |
1cf844c7 | 6050 | net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev; |
d8d1f30b | 6051 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
6052 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
6053 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 6054 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 6055 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 6056 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 6057 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 | 6058 | #endif |
76da0704 WC |
6059 | } else if (event == NETDEV_UNREGISTER && |
6060 | dev->reg_state != NETREG_UNREGISTERED) { | |
6061 | /* NETDEV_UNREGISTER could be fired for multiple times by | |
6062 | * netdev_wait_allrefs(). Make sure we only call this once. | |
6063 | */ | |
12d94a80 | 6064 | in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev); |
242d3a49 | 6065 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
12d94a80 ED |
6066 | in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev); |
6067 | in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
6068 | #endif |
6069 | } | |
6070 | ||
6071 | return NOTIFY_OK; | |
6072 | } | |
6073 | ||
1da177e4 LT |
6074 | /* |
6075 | * /proc | |
6076 | */ | |
6077 | ||
6078 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
6079 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
6080 | { | |
69ddb805 | 6081 | struct net *net = (struct net *)seq->private; |
1da177e4 | 6082 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
6083 | net->ipv6.rt6_stats->fib_nodes, |
6084 | net->ipv6.rt6_stats->fib_route_nodes, | |
81eb8447 | 6085 | atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc), |
69ddb805 DL |
6086 | net->ipv6.rt6_stats->fib_rt_entries, |
6087 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 6088 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 6089 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
6090 | |
6091 | return 0; | |
6092 | } | |
1da177e4 LT |
6093 | #endif /* CONFIG_PROC_FS */ |
6094 | ||
6095 | #ifdef CONFIG_SYSCTL | |
6096 | ||
1da177e4 | 6097 | static |
fe2c6338 | 6098 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
6099 | void __user *buffer, size_t *lenp, loff_t *ppos) |
6100 | { | |
c486da34 LAG |
6101 | struct net *net; |
6102 | int delay; | |
f0fb9b28 | 6103 | int ret; |
c486da34 | 6104 | if (!write) |
1da177e4 | 6105 | return -EINVAL; |
c486da34 LAG |
6106 | |
6107 | net = (struct net *)ctl->extra1; | |
6108 | delay = net->ipv6.sysctl.flush_delay; | |
f0fb9b28 AP |
6109 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
6110 | if (ret) | |
6111 | return ret; | |
6112 | ||
2ac3ac8f | 6113 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 6114 | return 0; |
1da177e4 LT |
6115 | } |
6116 | ||
ed792e28 | 6117 | static struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 6118 | { |
1da177e4 | 6119 | .procname = "flush", |
4990509f | 6120 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 6121 | .maxlen = sizeof(int), |
89c8b3a1 | 6122 | .mode = 0200, |
6d9f239a | 6123 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
6124 | }, |
6125 | { | |
1da177e4 | 6126 | .procname = "gc_thresh", |
9a7ec3a9 | 6127 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
6128 | .maxlen = sizeof(int), |
6129 | .mode = 0644, | |
6d9f239a | 6130 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6131 | }, |
6132 | { | |
1da177e4 | 6133 | .procname = "max_size", |
4990509f | 6134 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
6135 | .maxlen = sizeof(int), |
6136 | .mode = 0644, | |
6d9f239a | 6137 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6138 | }, |
6139 | { | |
1da177e4 | 6140 | .procname = "gc_min_interval", |
4990509f | 6141 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6142 | .maxlen = sizeof(int), |
6143 | .mode = 0644, | |
6d9f239a | 6144 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6145 | }, |
6146 | { | |
1da177e4 | 6147 | .procname = "gc_timeout", |
4990509f | 6148 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
6149 | .maxlen = sizeof(int), |
6150 | .mode = 0644, | |
6d9f239a | 6151 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6152 | }, |
6153 | { | |
1da177e4 | 6154 | .procname = "gc_interval", |
4990509f | 6155 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
6156 | .maxlen = sizeof(int), |
6157 | .mode = 0644, | |
6d9f239a | 6158 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6159 | }, |
6160 | { | |
1da177e4 | 6161 | .procname = "gc_elasticity", |
4990509f | 6162 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
6163 | .maxlen = sizeof(int), |
6164 | .mode = 0644, | |
f3d3f616 | 6165 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6166 | }, |
6167 | { | |
1da177e4 | 6168 | .procname = "mtu_expires", |
4990509f | 6169 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
6170 | .maxlen = sizeof(int), |
6171 | .mode = 0644, | |
6d9f239a | 6172 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
6173 | }, |
6174 | { | |
1da177e4 | 6175 | .procname = "min_adv_mss", |
4990509f | 6176 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
6177 | .maxlen = sizeof(int), |
6178 | .mode = 0644, | |
f3d3f616 | 6179 | .proc_handler = proc_dointvec, |
1da177e4 LT |
6180 | }, |
6181 | { | |
1da177e4 | 6182 | .procname = "gc_min_interval_ms", |
4990509f | 6183 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
6184 | .maxlen = sizeof(int), |
6185 | .mode = 0644, | |
6d9f239a | 6186 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 6187 | }, |
7c6bb7d2 DA |
6188 | { |
6189 | .procname = "skip_notify_on_dev_down", | |
6190 | .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down, | |
6191 | .maxlen = sizeof(int), | |
6192 | .mode = 0644, | |
b8e8a863 | 6193 | .proc_handler = proc_dointvec_minmax, |
eec4844f MC |
6194 | .extra1 = SYSCTL_ZERO, |
6195 | .extra2 = SYSCTL_ONE, | |
7c6bb7d2 | 6196 | }, |
f8572d8f | 6197 | { } |
1da177e4 LT |
6198 | }; |
6199 | ||
2c8c1e72 | 6200 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
6201 | { |
6202 | struct ctl_table *table; | |
6203 | ||
6204 | table = kmemdup(ipv6_route_table_template, | |
6205 | sizeof(ipv6_route_table_template), | |
6206 | GFP_KERNEL); | |
5ee09105 YH |
6207 | |
6208 | if (table) { | |
6209 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 6210 | table[0].extra1 = net; |
86393e52 | 6211 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
6212 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
6213 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
6214 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
6215 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
6216 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
6217 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
6218 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 6219 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
7c6bb7d2 | 6220 | table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down; |
464dc801 EB |
6221 | |
6222 | /* Don't export sysctls to unprivileged users */ | |
6223 | if (net->user_ns != &init_user_ns) | |
6224 | table[0].procname = NULL; | |
5ee09105 YH |
6225 | } |
6226 | ||
760f2d01 DL |
6227 | return table; |
6228 | } | |
1da177e4 LT |
6229 | #endif |
6230 | ||
2c8c1e72 | 6231 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 6232 | { |
633d424b | 6233 | int ret = -ENOMEM; |
8ed67789 | 6234 | |
86393e52 AD |
6235 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
6236 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 6237 | |
fc66f95c ED |
6238 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
6239 | goto out_ip6_dst_ops; | |
6240 | ||
1cf844c7 | 6241 | net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true); |
421842ed DA |
6242 | if (!net->ipv6.fib6_null_entry) |
6243 | goto out_ip6_dst_entries; | |
1cf844c7 DA |
6244 | memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template, |
6245 | sizeof(*net->ipv6.fib6_null_entry)); | |
421842ed | 6246 | |
8ed67789 DL |
6247 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
6248 | sizeof(*net->ipv6.ip6_null_entry), | |
6249 | GFP_KERNEL); | |
6250 | if (!net->ipv6.ip6_null_entry) | |
421842ed | 6251 | goto out_fib6_null_entry; |
d8d1f30b | 6252 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6253 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
6254 | ip6_template_metrics, true); | |
74109218 | 6255 | INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached); |
8ed67789 DL |
6256 | |
6257 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
feca7d8c | 6258 | net->ipv6.fib6_has_custom_rules = false; |
8ed67789 DL |
6259 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
6260 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
6261 | GFP_KERNEL); | |
68fffc67 PZ |
6262 | if (!net->ipv6.ip6_prohibit_entry) |
6263 | goto out_ip6_null_entry; | |
d8d1f30b | 6264 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6265 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
6266 | ip6_template_metrics, true); | |
74109218 | 6267 | INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached); |
8ed67789 DL |
6268 | |
6269 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
6270 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
6271 | GFP_KERNEL); | |
68fffc67 PZ |
6272 | if (!net->ipv6.ip6_blk_hole_entry) |
6273 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 6274 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
6275 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
6276 | ip6_template_metrics, true); | |
74109218 | 6277 | INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached); |
b9b33e7c PA |
6278 | #ifdef CONFIG_IPV6_SUBTREES |
6279 | net->ipv6.fib6_routes_require_src = 0; | |
6280 | #endif | |
8ed67789 DL |
6281 | #endif |
6282 | ||
b339a47c PZ |
6283 | net->ipv6.sysctl.flush_delay = 0; |
6284 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
6285 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
6286 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
6287 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
6288 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
6289 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
6290 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
7c6bb7d2 | 6291 | net->ipv6.sysctl.skip_notify_on_dev_down = 0; |
b339a47c | 6292 | |
6891a346 BT |
6293 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
6294 | ||
8ed67789 DL |
6295 | ret = 0; |
6296 | out: | |
6297 | return ret; | |
f2fc6a54 | 6298 | |
68fffc67 PZ |
6299 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
6300 | out_ip6_prohibit_entry: | |
6301 | kfree(net->ipv6.ip6_prohibit_entry); | |
6302 | out_ip6_null_entry: | |
6303 | kfree(net->ipv6.ip6_null_entry); | |
6304 | #endif | |
421842ed DA |
6305 | out_fib6_null_entry: |
6306 | kfree(net->ipv6.fib6_null_entry); | |
fc66f95c ED |
6307 | out_ip6_dst_entries: |
6308 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 6309 | out_ip6_dst_ops: |
f2fc6a54 | 6310 | goto out; |
cdb18761 DL |
6311 | } |
6312 | ||
2c8c1e72 | 6313 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 6314 | { |
421842ed | 6315 | kfree(net->ipv6.fib6_null_entry); |
8ed67789 DL |
6316 | kfree(net->ipv6.ip6_null_entry); |
6317 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6318 | kfree(net->ipv6.ip6_prohibit_entry); | |
6319 | kfree(net->ipv6.ip6_blk_hole_entry); | |
6320 | #endif | |
41bb78b4 | 6321 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
6322 | } |
6323 | ||
d189634e TG |
6324 | static int __net_init ip6_route_net_init_late(struct net *net) |
6325 | { | |
6326 | #ifdef CONFIG_PROC_FS | |
c3506372 CH |
6327 | proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops, |
6328 | sizeof(struct ipv6_route_iter)); | |
3617d949 CH |
6329 | proc_create_net_single("rt6_stats", 0444, net->proc_net, |
6330 | rt6_stats_seq_show, NULL); | |
d189634e TG |
6331 | #endif |
6332 | return 0; | |
6333 | } | |
6334 | ||
6335 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
6336 | { | |
6337 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
6338 | remove_proc_entry("ipv6_route", net->proc_net); |
6339 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
6340 | #endif |
6341 | } | |
6342 | ||
cdb18761 DL |
6343 | static struct pernet_operations ip6_route_net_ops = { |
6344 | .init = ip6_route_net_init, | |
6345 | .exit = ip6_route_net_exit, | |
6346 | }; | |
6347 | ||
c3426b47 DM |
6348 | static int __net_init ipv6_inetpeer_init(struct net *net) |
6349 | { | |
6350 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
6351 | ||
6352 | if (!bp) | |
6353 | return -ENOMEM; | |
6354 | inet_peer_base_init(bp); | |
6355 | net->ipv6.peers = bp; | |
6356 | return 0; | |
6357 | } | |
6358 | ||
6359 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
6360 | { | |
6361 | struct inet_peer_base *bp = net->ipv6.peers; | |
6362 | ||
6363 | net->ipv6.peers = NULL; | |
56a6b248 | 6364 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
6365 | kfree(bp); |
6366 | } | |
6367 | ||
2b823f72 | 6368 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
6369 | .init = ipv6_inetpeer_init, |
6370 | .exit = ipv6_inetpeer_exit, | |
6371 | }; | |
6372 | ||
d189634e TG |
6373 | static struct pernet_operations ip6_route_net_late_ops = { |
6374 | .init = ip6_route_net_init_late, | |
6375 | .exit = ip6_route_net_exit_late, | |
6376 | }; | |
6377 | ||
8ed67789 DL |
6378 | static struct notifier_block ip6_route_dev_notifier = { |
6379 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 6380 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
6381 | }; |
6382 | ||
2f460933 WC |
6383 | void __init ip6_route_init_special_entries(void) |
6384 | { | |
6385 | /* Registering of the loopback is done before this portion of code, | |
6386 | * the loopback reference in rt6_info will not be taken, do it | |
6387 | * manually for init_net */ | |
1cf844c7 | 6388 | init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev; |
2f460933 WC |
6389 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
6390 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6391 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
6392 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
6393 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6394 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
6395 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
6396 | #endif | |
6397 | } | |
6398 | ||
433d49c3 | 6399 | int __init ip6_route_init(void) |
1da177e4 | 6400 | { |
433d49c3 | 6401 | int ret; |
8d0b94af | 6402 | int cpu; |
433d49c3 | 6403 | |
9a7ec3a9 DL |
6404 | ret = -ENOMEM; |
6405 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 6406 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 6407 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 6408 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 6409 | goto out; |
14e50e57 | 6410 | |
fc66f95c | 6411 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 6412 | if (ret) |
bdb3289f | 6413 | goto out_kmem_cache; |
bdb3289f | 6414 | |
c3426b47 DM |
6415 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
6416 | if (ret) | |
e8803b6c | 6417 | goto out_dst_entries; |
2a0c451a | 6418 | |
7e52b33b DM |
6419 | ret = register_pernet_subsys(&ip6_route_net_ops); |
6420 | if (ret) | |
6421 | goto out_register_inetpeer; | |
c3426b47 | 6422 | |
5dc121e9 AE |
6423 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
6424 | ||
e8803b6c | 6425 | ret = fib6_init(); |
433d49c3 | 6426 | if (ret) |
8ed67789 | 6427 | goto out_register_subsys; |
433d49c3 | 6428 | |
433d49c3 DL |
6429 | ret = xfrm6_init(); |
6430 | if (ret) | |
e8803b6c | 6431 | goto out_fib6_init; |
c35b7e72 | 6432 | |
433d49c3 DL |
6433 | ret = fib6_rules_init(); |
6434 | if (ret) | |
6435 | goto xfrm6_init; | |
7e5449c2 | 6436 | |
d189634e TG |
6437 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
6438 | if (ret) | |
6439 | goto fib6_rules_init; | |
6440 | ||
16feebcf FW |
6441 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE, |
6442 | inet6_rtm_newroute, NULL, 0); | |
6443 | if (ret < 0) | |
6444 | goto out_register_late_subsys; | |
6445 | ||
6446 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE, | |
6447 | inet6_rtm_delroute, NULL, 0); | |
6448 | if (ret < 0) | |
6449 | goto out_register_late_subsys; | |
6450 | ||
6451 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, | |
6452 | inet6_rtm_getroute, NULL, | |
6453 | RTNL_FLAG_DOIT_UNLOCKED); | |
6454 | if (ret < 0) | |
d189634e | 6455 | goto out_register_late_subsys; |
c127ea2c | 6456 | |
8ed67789 | 6457 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 6458 | if (ret) |
d189634e | 6459 | goto out_register_late_subsys; |
8ed67789 | 6460 | |
8d0b94af MKL |
6461 | for_each_possible_cpu(cpu) { |
6462 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
6463 | ||
6464 | INIT_LIST_HEAD(&ul->head); | |
6465 | spin_lock_init(&ul->lock); | |
6466 | } | |
6467 | ||
433d49c3 DL |
6468 | out: |
6469 | return ret; | |
6470 | ||
d189634e | 6471 | out_register_late_subsys: |
16feebcf | 6472 | rtnl_unregister_all(PF_INET6); |
d189634e | 6473 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
433d49c3 | 6474 | fib6_rules_init: |
433d49c3 DL |
6475 | fib6_rules_cleanup(); |
6476 | xfrm6_init: | |
433d49c3 | 6477 | xfrm6_fini(); |
2a0c451a TG |
6478 | out_fib6_init: |
6479 | fib6_gc_cleanup(); | |
8ed67789 DL |
6480 | out_register_subsys: |
6481 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
6482 | out_register_inetpeer: |
6483 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
6484 | out_dst_entries: |
6485 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 6486 | out_kmem_cache: |
f2fc6a54 | 6487 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 6488 | goto out; |
1da177e4 LT |
6489 | } |
6490 | ||
6491 | void ip6_route_cleanup(void) | |
6492 | { | |
8ed67789 | 6493 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 6494 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 6495 | fib6_rules_cleanup(); |
1da177e4 | 6496 | xfrm6_fini(); |
1da177e4 | 6497 | fib6_gc_cleanup(); |
c3426b47 | 6498 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 6499 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 6500 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 6501 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 6502 | } |