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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
f3213831 JP |
27 | #define pr_fmt(fmt) "IPv6: " fmt |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 | 30 | #include <linux/errno.h> |
bc3b2d7f | 31 | #include <linux/export.h> |
1da177e4 LT |
32 | #include <linux/types.h> |
33 | #include <linux/times.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/net.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/in6.h> | |
7bc570c8 | 40 | #include <linux/mroute6.h> |
1da177e4 | 41 | #include <linux/init.h> |
1da177e4 | 42 | #include <linux/if_arp.h> |
1da177e4 LT |
43 | #include <linux/proc_fs.h> |
44 | #include <linux/seq_file.h> | |
5b7c931d | 45 | #include <linux/nsproxy.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/snmp.h> |
49 | #include <net/ipv6.h> | |
50 | #include <net/ip6_fib.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ndisc.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/tcp.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <net/dst.h> | |
904af04d | 57 | #include <net/dst_metadata.h> |
1da177e4 | 58 | #include <net/xfrm.h> |
8d71740c | 59 | #include <net/netevent.h> |
21713ebc | 60 | #include <net/netlink.h> |
51ebd318 | 61 | #include <net/nexthop.h> |
19e42e45 | 62 | #include <net/lwtunnel.h> |
904af04d | 63 | #include <net/ip_tunnels.h> |
ca254490 | 64 | #include <net/l3mdev.h> |
b811580d | 65 | #include <trace/events/fib6.h> |
1da177e4 | 66 | |
7c0f6ba6 | 67 | #include <linux/uaccess.h> |
1da177e4 LT |
68 | |
69 | #ifdef CONFIG_SYSCTL | |
70 | #include <linux/sysctl.h> | |
71 | #endif | |
72 | ||
afc154e9 | 73 | enum rt6_nud_state { |
7e980569 JB |
74 | RT6_NUD_FAIL_HARD = -3, |
75 | RT6_NUD_FAIL_PROBE = -2, | |
76 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
77 | RT6_NUD_SUCCEED = 1 |
78 | }; | |
79 | ||
83a09abd | 80 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 81 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 82 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 83 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
84 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
85 | static void ip6_dst_destroy(struct dst_entry *); | |
86 | static void ip6_dst_ifdown(struct dst_entry *, | |
87 | struct net_device *dev, int how); | |
569d3645 | 88 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
89 | |
90 | static int ip6_pkt_discard(struct sk_buff *skb); | |
ede2059d | 91 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
7150aede | 92 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
ede2059d | 93 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb); |
1da177e4 | 94 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
95 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
96 | struct sk_buff *skb, u32 mtu); | |
97 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
98 | struct sk_buff *skb); | |
4b32b5ad | 99 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 100 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 101 | |
70ceb4f5 | 102 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 103 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 104 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
105 | const struct in6_addr *gwaddr, |
106 | struct net_device *dev, | |
95c96174 | 107 | unsigned int pref); |
efa2cea0 | 108 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 109 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
110 | const struct in6_addr *gwaddr, |
111 | struct net_device *dev); | |
70ceb4f5 YH |
112 | #endif |
113 | ||
8d0b94af MKL |
114 | struct uncached_list { |
115 | spinlock_t lock; | |
116 | struct list_head head; | |
117 | }; | |
118 | ||
119 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
120 | ||
121 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
122 | { | |
123 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
124 | ||
125 | rt->dst.flags |= DST_NOCACHE; | |
126 | rt->rt6i_uncached_list = ul; | |
127 | ||
128 | spin_lock_bh(&ul->lock); | |
129 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
130 | spin_unlock_bh(&ul->lock); | |
131 | } | |
132 | ||
133 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
134 | { | |
135 | if (!list_empty(&rt->rt6i_uncached)) { | |
136 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
137 | ||
138 | spin_lock_bh(&ul->lock); | |
139 | list_del(&rt->rt6i_uncached); | |
140 | spin_unlock_bh(&ul->lock); | |
141 | } | |
142 | } | |
143 | ||
144 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
145 | { | |
146 | struct net_device *loopback_dev = net->loopback_dev; | |
147 | int cpu; | |
148 | ||
e332bc67 EB |
149 | if (dev == loopback_dev) |
150 | return; | |
151 | ||
8d0b94af MKL |
152 | for_each_possible_cpu(cpu) { |
153 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
154 | struct rt6_info *rt; | |
155 | ||
156 | spin_lock_bh(&ul->lock); | |
157 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
158 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
159 | struct net_device *rt_dev = rt->dst.dev; | |
160 | ||
e332bc67 | 161 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
162 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
163 | in6_dev_put(rt_idev); | |
164 | } | |
165 | ||
e332bc67 | 166 | if (rt_dev == dev) { |
8d0b94af MKL |
167 | rt->dst.dev = loopback_dev; |
168 | dev_hold(rt->dst.dev); | |
169 | dev_put(rt_dev); | |
170 | } | |
171 | } | |
172 | spin_unlock_bh(&ul->lock); | |
173 | } | |
174 | } | |
175 | ||
d52d3997 MKL |
176 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
177 | { | |
178 | return dst_metrics_write_ptr(rt->dst.from); | |
179 | } | |
180 | ||
06582540 DM |
181 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
182 | { | |
4b32b5ad | 183 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 184 | |
d52d3997 MKL |
185 | if (rt->rt6i_flags & RTF_PCPU) |
186 | return rt6_pcpu_cow_metrics(rt); | |
187 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
188 | return NULL; |
189 | else | |
3b471175 | 190 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
191 | } |
192 | ||
f894cbf8 DM |
193 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
194 | struct sk_buff *skb, | |
195 | const void *daddr) | |
39232973 DM |
196 | { |
197 | struct in6_addr *p = &rt->rt6i_gateway; | |
198 | ||
a7563f34 | 199 | if (!ipv6_addr_any(p)) |
39232973 | 200 | return (const void *) p; |
f894cbf8 DM |
201 | else if (skb) |
202 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
203 | return daddr; |
204 | } | |
205 | ||
f894cbf8 DM |
206 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
207 | struct sk_buff *skb, | |
208 | const void *daddr) | |
d3aaeb38 | 209 | { |
39232973 DM |
210 | struct rt6_info *rt = (struct rt6_info *) dst; |
211 | struct neighbour *n; | |
212 | ||
f894cbf8 | 213 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 214 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
215 | if (n) |
216 | return n; | |
217 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
218 | } | |
219 | ||
9a7ec3a9 | 220 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 221 | .family = AF_INET6, |
1da177e4 LT |
222 | .gc = ip6_dst_gc, |
223 | .gc_thresh = 1024, | |
224 | .check = ip6_dst_check, | |
0dbaee3b | 225 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 226 | .mtu = ip6_mtu, |
06582540 | 227 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
228 | .destroy = ip6_dst_destroy, |
229 | .ifdown = ip6_dst_ifdown, | |
230 | .negative_advice = ip6_negative_advice, | |
231 | .link_failure = ip6_link_failure, | |
232 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 233 | .redirect = rt6_do_redirect, |
9f8955cc | 234 | .local_out = __ip6_local_out, |
d3aaeb38 | 235 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
236 | }; |
237 | ||
ebb762f2 | 238 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 239 | { |
618f9bc7 SK |
240 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
241 | ||
242 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
243 | } |
244 | ||
6700c270 DM |
245 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
246 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
247 | { |
248 | } | |
249 | ||
6700c270 DM |
250 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
251 | struct sk_buff *skb) | |
b587ee3b DM |
252 | { |
253 | } | |
254 | ||
14e50e57 DM |
255 | static struct dst_ops ip6_dst_blackhole_ops = { |
256 | .family = AF_INET6, | |
14e50e57 DM |
257 | .destroy = ip6_dst_destroy, |
258 | .check = ip6_dst_check, | |
ebb762f2 | 259 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 260 | .default_advmss = ip6_default_advmss, |
14e50e57 | 261 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 262 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 263 | .cow_metrics = dst_cow_metrics_generic, |
d3aaeb38 | 264 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
265 | }; |
266 | ||
62fa8a84 | 267 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 268 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
269 | }; |
270 | ||
fb0af4c7 | 271 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
272 | .dst = { |
273 | .__refcnt = ATOMIC_INIT(1), | |
274 | .__use = 1, | |
2c20cbd7 | 275 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 276 | .error = -ENETUNREACH, |
d8d1f30b CG |
277 | .input = ip6_pkt_discard, |
278 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
279 | }, |
280 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 281 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
282 | .rt6i_metric = ~(u32) 0, |
283 | .rt6i_ref = ATOMIC_INIT(1), | |
284 | }; | |
285 | ||
101367c2 TG |
286 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
287 | ||
fb0af4c7 | 288 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
289 | .dst = { |
290 | .__refcnt = ATOMIC_INIT(1), | |
291 | .__use = 1, | |
2c20cbd7 | 292 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 293 | .error = -EACCES, |
d8d1f30b CG |
294 | .input = ip6_pkt_prohibit, |
295 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
296 | }, |
297 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 298 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
299 | .rt6i_metric = ~(u32) 0, |
300 | .rt6i_ref = ATOMIC_INIT(1), | |
301 | }; | |
302 | ||
fb0af4c7 | 303 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
304 | .dst = { |
305 | .__refcnt = ATOMIC_INIT(1), | |
306 | .__use = 1, | |
2c20cbd7 | 307 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 308 | .error = -EINVAL, |
d8d1f30b | 309 | .input = dst_discard, |
ede2059d | 310 | .output = dst_discard_out, |
101367c2 TG |
311 | }, |
312 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 313 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
314 | .rt6i_metric = ~(u32) 0, |
315 | .rt6i_ref = ATOMIC_INIT(1), | |
316 | }; | |
317 | ||
318 | #endif | |
319 | ||
ebfa45f0 MKL |
320 | static void rt6_info_init(struct rt6_info *rt) |
321 | { | |
322 | struct dst_entry *dst = &rt->dst; | |
323 | ||
324 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
325 | INIT_LIST_HEAD(&rt->rt6i_siblings); | |
326 | INIT_LIST_HEAD(&rt->rt6i_uncached); | |
327 | } | |
328 | ||
1da177e4 | 329 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
330 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
331 | struct net_device *dev, | |
ad706862 | 332 | int flags) |
1da177e4 | 333 | { |
97bab73f | 334 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 335 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 336 | |
ebfa45f0 MKL |
337 | if (rt) |
338 | rt6_info_init(rt); | |
8104891b | 339 | |
cf911662 | 340 | return rt; |
1da177e4 LT |
341 | } |
342 | ||
9ab179d8 DA |
343 | struct rt6_info *ip6_dst_alloc(struct net *net, |
344 | struct net_device *dev, | |
345 | int flags) | |
d52d3997 | 346 | { |
ad706862 | 347 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
348 | |
349 | if (rt) { | |
350 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
351 | if (rt->rt6i_pcpu) { | |
352 | int cpu; | |
353 | ||
354 | for_each_possible_cpu(cpu) { | |
355 | struct rt6_info **p; | |
356 | ||
357 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
358 | /* no one shares rt */ | |
359 | *p = NULL; | |
360 | } | |
361 | } else { | |
362 | dst_destroy((struct dst_entry *)rt); | |
363 | return NULL; | |
364 | } | |
365 | } | |
366 | ||
367 | return rt; | |
368 | } | |
9ab179d8 | 369 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 370 | |
1da177e4 LT |
371 | static void ip6_dst_destroy(struct dst_entry *dst) |
372 | { | |
373 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 374 | struct dst_entry *from = dst->from; |
8d0b94af | 375 | struct inet6_dev *idev; |
1da177e4 | 376 | |
4b32b5ad | 377 | dst_destroy_metrics_generic(dst); |
87775312 | 378 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
379 | rt6_uncached_list_del(rt); |
380 | ||
381 | idev = rt->rt6i_idev; | |
38308473 | 382 | if (idev) { |
1da177e4 LT |
383 | rt->rt6i_idev = NULL; |
384 | in6_dev_put(idev); | |
1ab1457c | 385 | } |
1716a961 | 386 | |
ecd98837 YH |
387 | dst->from = NULL; |
388 | dst_release(from); | |
b3419363 DM |
389 | } |
390 | ||
1da177e4 LT |
391 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
392 | int how) | |
393 | { | |
394 | struct rt6_info *rt = (struct rt6_info *)dst; | |
395 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 396 | struct net_device *loopback_dev = |
c346dca1 | 397 | dev_net(dev)->loopback_dev; |
1da177e4 | 398 | |
97cac082 DM |
399 | if (dev != loopback_dev) { |
400 | if (idev && idev->dev == dev) { | |
401 | struct inet6_dev *loopback_idev = | |
402 | in6_dev_get(loopback_dev); | |
403 | if (loopback_idev) { | |
404 | rt->rt6i_idev = loopback_idev; | |
405 | in6_dev_put(idev); | |
406 | } | |
407 | } | |
1da177e4 LT |
408 | } |
409 | } | |
410 | ||
5973fb1e MKL |
411 | static bool __rt6_check_expired(const struct rt6_info *rt) |
412 | { | |
413 | if (rt->rt6i_flags & RTF_EXPIRES) | |
414 | return time_after(jiffies, rt->dst.expires); | |
415 | else | |
416 | return false; | |
417 | } | |
418 | ||
a50feda5 | 419 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 420 | { |
1716a961 G |
421 | if (rt->rt6i_flags & RTF_EXPIRES) { |
422 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 423 | return true; |
1716a961 | 424 | } else if (rt->dst.from) { |
3fd91fb3 | 425 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 426 | } |
a50feda5 | 427 | return false; |
1da177e4 LT |
428 | } |
429 | ||
51ebd318 ND |
430 | /* Multipath route selection: |
431 | * Hash based function using packet header and flowlabel. | |
432 | * Adapted from fib_info_hashfn() | |
433 | */ | |
434 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
435 | const struct flowi6 *fl6) | |
436 | { | |
644d0e65 | 437 | return get_hash_from_flowi6(fl6) % candidate_count; |
51ebd318 ND |
438 | } |
439 | ||
440 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
441 | struct flowi6 *fl6, int oif, |
442 | int strict) | |
51ebd318 ND |
443 | { |
444 | struct rt6_info *sibling, *next_sibling; | |
445 | int route_choosen; | |
446 | ||
447 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
448 | /* Don't change the route, if route_choosen == 0 | |
449 | * (siblings does not include ourself) | |
450 | */ | |
451 | if (route_choosen) | |
452 | list_for_each_entry_safe(sibling, next_sibling, | |
453 | &match->rt6i_siblings, rt6i_siblings) { | |
454 | route_choosen--; | |
455 | if (route_choosen == 0) { | |
52bd4c0c ND |
456 | if (rt6_score_route(sibling, oif, strict) < 0) |
457 | break; | |
51ebd318 ND |
458 | match = sibling; |
459 | break; | |
460 | } | |
461 | } | |
462 | return match; | |
463 | } | |
464 | ||
1da177e4 | 465 | /* |
c71099ac | 466 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
467 | */ |
468 | ||
8ed67789 DL |
469 | static inline struct rt6_info *rt6_device_match(struct net *net, |
470 | struct rt6_info *rt, | |
b71d1d42 | 471 | const struct in6_addr *saddr, |
1da177e4 | 472 | int oif, |
d420895e | 473 | int flags) |
1da177e4 LT |
474 | { |
475 | struct rt6_info *local = NULL; | |
476 | struct rt6_info *sprt; | |
477 | ||
dd3abc4e YH |
478 | if (!oif && ipv6_addr_any(saddr)) |
479 | goto out; | |
480 | ||
d8d1f30b | 481 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 482 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
483 | |
484 | if (oif) { | |
1da177e4 LT |
485 | if (dev->ifindex == oif) |
486 | return sprt; | |
487 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 488 | if (!sprt->rt6i_idev || |
1da177e4 | 489 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 490 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 491 | continue; |
17fb0b2b DA |
492 | if (local && |
493 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
494 | continue; |
495 | } | |
496 | local = sprt; | |
497 | } | |
dd3abc4e YH |
498 | } else { |
499 | if (ipv6_chk_addr(net, saddr, dev, | |
500 | flags & RT6_LOOKUP_F_IFACE)) | |
501 | return sprt; | |
1da177e4 | 502 | } |
dd3abc4e | 503 | } |
1da177e4 | 504 | |
dd3abc4e | 505 | if (oif) { |
1da177e4 LT |
506 | if (local) |
507 | return local; | |
508 | ||
d420895e | 509 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 510 | return net->ipv6.ip6_null_entry; |
1da177e4 | 511 | } |
dd3abc4e | 512 | out: |
1da177e4 LT |
513 | return rt; |
514 | } | |
515 | ||
27097255 | 516 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
517 | struct __rt6_probe_work { |
518 | struct work_struct work; | |
519 | struct in6_addr target; | |
520 | struct net_device *dev; | |
521 | }; | |
522 | ||
523 | static void rt6_probe_deferred(struct work_struct *w) | |
524 | { | |
525 | struct in6_addr mcaddr; | |
526 | struct __rt6_probe_work *work = | |
527 | container_of(w, struct __rt6_probe_work, work); | |
528 | ||
529 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 530 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 531 | dev_put(work->dev); |
662f5533 | 532 | kfree(work); |
c2f17e82 HFS |
533 | } |
534 | ||
27097255 YH |
535 | static void rt6_probe(struct rt6_info *rt) |
536 | { | |
990edb42 | 537 | struct __rt6_probe_work *work; |
f2c31e32 | 538 | struct neighbour *neigh; |
27097255 YH |
539 | /* |
540 | * Okay, this does not seem to be appropriate | |
541 | * for now, however, we need to check if it | |
542 | * is really so; aka Router Reachability Probing. | |
543 | * | |
544 | * Router Reachability Probe MUST be rate-limited | |
545 | * to no more than one per minute. | |
546 | */ | |
2152caea | 547 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 548 | return; |
2152caea YH |
549 | rcu_read_lock_bh(); |
550 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
551 | if (neigh) { | |
8d6c31bf MKL |
552 | if (neigh->nud_state & NUD_VALID) |
553 | goto out; | |
554 | ||
990edb42 | 555 | work = NULL; |
2152caea | 556 | write_lock(&neigh->lock); |
990edb42 MKL |
557 | if (!(neigh->nud_state & NUD_VALID) && |
558 | time_after(jiffies, | |
559 | neigh->updated + | |
560 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
561 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
562 | if (work) | |
563 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 564 | } |
2152caea | 565 | write_unlock(&neigh->lock); |
990edb42 MKL |
566 | } else { |
567 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 568 | } |
990edb42 MKL |
569 | |
570 | if (work) { | |
571 | INIT_WORK(&work->work, rt6_probe_deferred); | |
572 | work->target = rt->rt6i_gateway; | |
573 | dev_hold(rt->dst.dev); | |
574 | work->dev = rt->dst.dev; | |
575 | schedule_work(&work->work); | |
576 | } | |
577 | ||
8d6c31bf | 578 | out: |
2152caea | 579 | rcu_read_unlock_bh(); |
27097255 YH |
580 | } |
581 | #else | |
582 | static inline void rt6_probe(struct rt6_info *rt) | |
583 | { | |
27097255 YH |
584 | } |
585 | #endif | |
586 | ||
1da177e4 | 587 | /* |
554cfb7e | 588 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 589 | */ |
b6f99a21 | 590 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 591 | { |
d1918542 | 592 | struct net_device *dev = rt->dst.dev; |
161980f4 | 593 | if (!oif || dev->ifindex == oif) |
554cfb7e | 594 | return 2; |
161980f4 DM |
595 | if ((dev->flags & IFF_LOOPBACK) && |
596 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
597 | return 1; | |
598 | return 0; | |
554cfb7e | 599 | } |
1da177e4 | 600 | |
afc154e9 | 601 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 602 | { |
f2c31e32 | 603 | struct neighbour *neigh; |
afc154e9 | 604 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 605 | |
4d0c5911 YH |
606 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
607 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 608 | return RT6_NUD_SUCCEED; |
145a3621 YH |
609 | |
610 | rcu_read_lock_bh(); | |
611 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
612 | if (neigh) { | |
613 | read_lock(&neigh->lock); | |
554cfb7e | 614 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 615 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 616 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 617 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 618 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
619 | else |
620 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 621 | #endif |
145a3621 | 622 | read_unlock(&neigh->lock); |
afc154e9 HFS |
623 | } else { |
624 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 625 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 626 | } |
145a3621 YH |
627 | rcu_read_unlock_bh(); |
628 | ||
a5a81f0b | 629 | return ret; |
1da177e4 LT |
630 | } |
631 | ||
554cfb7e YH |
632 | static int rt6_score_route(struct rt6_info *rt, int oif, |
633 | int strict) | |
1da177e4 | 634 | { |
a5a81f0b | 635 | int m; |
1ab1457c | 636 | |
4d0c5911 | 637 | m = rt6_check_dev(rt, oif); |
77d16f45 | 638 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 639 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
640 | #ifdef CONFIG_IPV6_ROUTER_PREF |
641 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
642 | #endif | |
afc154e9 HFS |
643 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
644 | int n = rt6_check_neigh(rt); | |
645 | if (n < 0) | |
646 | return n; | |
647 | } | |
554cfb7e YH |
648 | return m; |
649 | } | |
650 | ||
f11e6659 | 651 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
652 | int *mpri, struct rt6_info *match, |
653 | bool *do_rr) | |
554cfb7e | 654 | { |
f11e6659 | 655 | int m; |
afc154e9 | 656 | bool match_do_rr = false; |
35103d11 AG |
657 | struct inet6_dev *idev = rt->rt6i_idev; |
658 | struct net_device *dev = rt->dst.dev; | |
659 | ||
660 | if (dev && !netif_carrier_ok(dev) && | |
d5d32e4b DA |
661 | idev->cnf.ignore_routes_with_linkdown && |
662 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) | |
35103d11 | 663 | goto out; |
f11e6659 DM |
664 | |
665 | if (rt6_check_expired(rt)) | |
666 | goto out; | |
667 | ||
668 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 669 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
670 | match_do_rr = true; |
671 | m = 0; /* lowest valid score */ | |
7e980569 | 672 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 673 | goto out; |
afc154e9 HFS |
674 | } |
675 | ||
676 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
677 | rt6_probe(rt); | |
f11e6659 | 678 | |
7e980569 | 679 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 680 | if (m > *mpri) { |
afc154e9 | 681 | *do_rr = match_do_rr; |
f11e6659 DM |
682 | *mpri = m; |
683 | match = rt; | |
f11e6659 | 684 | } |
f11e6659 DM |
685 | out: |
686 | return match; | |
687 | } | |
688 | ||
689 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
690 | struct rt6_info *rr_head, | |
afc154e9 HFS |
691 | u32 metric, int oif, int strict, |
692 | bool *do_rr) | |
f11e6659 | 693 | { |
9fbdcfaf | 694 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 695 | int mpri = -1; |
1da177e4 | 696 | |
f11e6659 | 697 | match = NULL; |
9fbdcfaf SK |
698 | cont = NULL; |
699 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
700 | if (rt->rt6i_metric != metric) { | |
701 | cont = rt; | |
702 | break; | |
703 | } | |
704 | ||
705 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
706 | } | |
707 | ||
708 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
709 | if (rt->rt6i_metric != metric) { | |
710 | cont = rt; | |
711 | break; | |
712 | } | |
713 | ||
afc154e9 | 714 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
715 | } |
716 | ||
717 | if (match || !cont) | |
718 | return match; | |
719 | ||
720 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 721 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 722 | |
f11e6659 DM |
723 | return match; |
724 | } | |
1da177e4 | 725 | |
f11e6659 DM |
726 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
727 | { | |
728 | struct rt6_info *match, *rt0; | |
8ed67789 | 729 | struct net *net; |
afc154e9 | 730 | bool do_rr = false; |
1da177e4 | 731 | |
f11e6659 DM |
732 | rt0 = fn->rr_ptr; |
733 | if (!rt0) | |
734 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 735 | |
afc154e9 HFS |
736 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
737 | &do_rr); | |
1da177e4 | 738 | |
afc154e9 | 739 | if (do_rr) { |
d8d1f30b | 740 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 741 | |
554cfb7e | 742 | /* no entries matched; do round-robin */ |
f11e6659 DM |
743 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
744 | next = fn->leaf; | |
745 | ||
746 | if (next != rt0) | |
747 | fn->rr_ptr = next; | |
1da177e4 | 748 | } |
1da177e4 | 749 | |
d1918542 | 750 | net = dev_net(rt0->dst.dev); |
a02cec21 | 751 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
752 | } |
753 | ||
8b9df265 MKL |
754 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
755 | { | |
756 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
757 | } | |
758 | ||
70ceb4f5 YH |
759 | #ifdef CONFIG_IPV6_ROUTE_INFO |
760 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 761 | const struct in6_addr *gwaddr) |
70ceb4f5 | 762 | { |
c346dca1 | 763 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
764 | struct route_info *rinfo = (struct route_info *) opt; |
765 | struct in6_addr prefix_buf, *prefix; | |
766 | unsigned int pref; | |
4bed72e4 | 767 | unsigned long lifetime; |
70ceb4f5 YH |
768 | struct rt6_info *rt; |
769 | ||
770 | if (len < sizeof(struct route_info)) { | |
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | /* Sanity check for prefix_len and length */ | |
775 | if (rinfo->length > 3) { | |
776 | return -EINVAL; | |
777 | } else if (rinfo->prefix_len > 128) { | |
778 | return -EINVAL; | |
779 | } else if (rinfo->prefix_len > 64) { | |
780 | if (rinfo->length < 2) { | |
781 | return -EINVAL; | |
782 | } | |
783 | } else if (rinfo->prefix_len > 0) { | |
784 | if (rinfo->length < 1) { | |
785 | return -EINVAL; | |
786 | } | |
787 | } | |
788 | ||
789 | pref = rinfo->route_pref; | |
790 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 791 | return -EINVAL; |
70ceb4f5 | 792 | |
4bed72e4 | 793 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
794 | |
795 | if (rinfo->length == 3) | |
796 | prefix = (struct in6_addr *)rinfo->prefix; | |
797 | else { | |
798 | /* this function is safe */ | |
799 | ipv6_addr_prefix(&prefix_buf, | |
800 | (struct in6_addr *)rinfo->prefix, | |
801 | rinfo->prefix_len); | |
802 | prefix = &prefix_buf; | |
803 | } | |
804 | ||
f104a567 DJ |
805 | if (rinfo->prefix_len == 0) |
806 | rt = rt6_get_dflt_router(gwaddr, dev); | |
807 | else | |
808 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 809 | gwaddr, dev); |
70ceb4f5 YH |
810 | |
811 | if (rt && !lifetime) { | |
e0a1ad73 | 812 | ip6_del_rt(rt); |
70ceb4f5 YH |
813 | rt = NULL; |
814 | } | |
815 | ||
816 | if (!rt && lifetime) | |
830218c1 DA |
817 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
818 | dev, pref); | |
70ceb4f5 YH |
819 | else if (rt) |
820 | rt->rt6i_flags = RTF_ROUTEINFO | | |
821 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
822 | ||
823 | if (rt) { | |
1716a961 G |
824 | if (!addrconf_finite_timeout(lifetime)) |
825 | rt6_clean_expires(rt); | |
826 | else | |
827 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
828 | ||
94e187c0 | 829 | ip6_rt_put(rt); |
70ceb4f5 YH |
830 | } |
831 | return 0; | |
832 | } | |
833 | #endif | |
834 | ||
a3c00e46 MKL |
835 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
836 | struct in6_addr *saddr) | |
837 | { | |
838 | struct fib6_node *pn; | |
839 | while (1) { | |
840 | if (fn->fn_flags & RTN_TL_ROOT) | |
841 | return NULL; | |
842 | pn = fn->parent; | |
843 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
844 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
845 | else | |
846 | fn = pn; | |
847 | if (fn->fn_flags & RTN_RTINFO) | |
848 | return fn; | |
849 | } | |
850 | } | |
c71099ac | 851 | |
8ed67789 DL |
852 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
853 | struct fib6_table *table, | |
4c9483b2 | 854 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
855 | { |
856 | struct fib6_node *fn; | |
857 | struct rt6_info *rt; | |
858 | ||
c71099ac | 859 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 860 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
861 | restart: |
862 | rt = fn->leaf; | |
4c9483b2 | 863 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 864 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 865 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
866 | if (rt == net->ipv6.ip6_null_entry) { |
867 | fn = fib6_backtrack(fn, &fl6->saddr); | |
868 | if (fn) | |
869 | goto restart; | |
870 | } | |
d8d1f30b | 871 | dst_use(&rt->dst, jiffies); |
c71099ac | 872 | read_unlock_bh(&table->tb6_lock); |
b811580d DA |
873 | |
874 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
875 | ||
c71099ac TG |
876 | return rt; |
877 | ||
878 | } | |
879 | ||
67ba4152 | 880 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
881 | int flags) |
882 | { | |
883 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
884 | } | |
885 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
886 | ||
9acd9f3a YH |
887 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
888 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 889 | { |
4c9483b2 DM |
890 | struct flowi6 fl6 = { |
891 | .flowi6_oif = oif, | |
892 | .daddr = *daddr, | |
c71099ac TG |
893 | }; |
894 | struct dst_entry *dst; | |
77d16f45 | 895 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 896 | |
adaa70bb | 897 | if (saddr) { |
4c9483b2 | 898 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
899 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
900 | } | |
901 | ||
4c9483b2 | 902 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
903 | if (dst->error == 0) |
904 | return (struct rt6_info *) dst; | |
905 | ||
906 | dst_release(dst); | |
907 | ||
1da177e4 LT |
908 | return NULL; |
909 | } | |
7159039a YH |
910 | EXPORT_SYMBOL(rt6_lookup); |
911 | ||
c71099ac | 912 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
913 | It takes new route entry, the addition fails by any reason the |
914 | route is freed. In any case, if caller does not hold it, it may | |
915 | be destroyed. | |
916 | */ | |
917 | ||
e5fd387a | 918 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 919 | struct mx6_config *mxc) |
1da177e4 LT |
920 | { |
921 | int err; | |
c71099ac | 922 | struct fib6_table *table; |
1da177e4 | 923 | |
c71099ac TG |
924 | table = rt->rt6i_table; |
925 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 926 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 927 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
928 | |
929 | return err; | |
930 | } | |
931 | ||
40e22e8f TG |
932 | int ip6_ins_rt(struct rt6_info *rt) |
933 | { | |
e715b6d3 FW |
934 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
935 | struct mx6_config mxc = { .mx = NULL, }; | |
936 | ||
937 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
938 | } |
939 | ||
8b9df265 MKL |
940 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
941 | const struct in6_addr *daddr, | |
942 | const struct in6_addr *saddr) | |
1da177e4 | 943 | { |
1da177e4 LT |
944 | struct rt6_info *rt; |
945 | ||
946 | /* | |
947 | * Clone the route. | |
948 | */ | |
949 | ||
d52d3997 | 950 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 951 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 952 | |
ad706862 | 953 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0); |
83a09abd MKL |
954 | |
955 | if (!rt) | |
956 | return NULL; | |
957 | ||
958 | ip6_rt_copy_init(rt, ort); | |
959 | rt->rt6i_flags |= RTF_CACHE; | |
960 | rt->rt6i_metric = 0; | |
961 | rt->dst.flags |= DST_HOST; | |
962 | rt->rt6i_dst.addr = *daddr; | |
963 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 964 | |
83a09abd MKL |
965 | if (!rt6_is_gw_or_nonexthop(ort)) { |
966 | if (ort->rt6i_dst.plen != 128 && | |
967 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
968 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 969 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
970 | if (rt->rt6i_src.plen && saddr) { |
971 | rt->rt6i_src.addr = *saddr; | |
972 | rt->rt6i_src.plen = 128; | |
8b9df265 | 973 | } |
83a09abd | 974 | #endif |
95a9a5ba | 975 | } |
1da177e4 | 976 | |
95a9a5ba YH |
977 | return rt; |
978 | } | |
1da177e4 | 979 | |
d52d3997 MKL |
980 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
981 | { | |
982 | struct rt6_info *pcpu_rt; | |
983 | ||
984 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
ad706862 | 985 | rt->dst.dev, rt->dst.flags); |
d52d3997 MKL |
986 | |
987 | if (!pcpu_rt) | |
988 | return NULL; | |
989 | ip6_rt_copy_init(pcpu_rt, rt); | |
990 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
991 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
992 | return pcpu_rt; | |
993 | } | |
994 | ||
995 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
996 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
997 | { | |
a73e4195 | 998 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
999 | |
1000 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1001 | pcpu_rt = *p; | |
1002 | ||
a73e4195 MKL |
1003 | if (pcpu_rt) { |
1004 | dst_hold(&pcpu_rt->dst); | |
1005 | rt6_dst_from_metrics_check(pcpu_rt); | |
1006 | } | |
1007 | return pcpu_rt; | |
1008 | } | |
1009 | ||
1010 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1011 | { | |
9c7370a1 | 1012 | struct fib6_table *table = rt->rt6i_table; |
a73e4195 | 1013 | struct rt6_info *pcpu_rt, *prev, **p; |
d52d3997 MKL |
1014 | |
1015 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1016 | if (!pcpu_rt) { | |
1017 | struct net *net = dev_net(rt->dst.dev); | |
1018 | ||
9c7370a1 MKL |
1019 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1020 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1021 | } |
1022 | ||
9c7370a1 MKL |
1023 | read_lock_bh(&table->tb6_lock); |
1024 | if (rt->rt6i_pcpu) { | |
1025 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1026 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1027 | if (prev) { | |
1028 | /* If someone did it before us, return prev instead */ | |
1029 | dst_destroy(&pcpu_rt->dst); | |
1030 | pcpu_rt = prev; | |
1031 | } | |
1032 | } else { | |
1033 | /* rt has been removed from the fib6 tree | |
1034 | * before we have a chance to acquire the read_lock. | |
1035 | * In this case, don't brother to create a pcpu rt | |
1036 | * since rt is going away anyway. The next | |
1037 | * dst_check() will trigger a re-lookup. | |
1038 | */ | |
d52d3997 | 1039 | dst_destroy(&pcpu_rt->dst); |
9c7370a1 | 1040 | pcpu_rt = rt; |
d52d3997 | 1041 | } |
d52d3997 MKL |
1042 | dst_hold(&pcpu_rt->dst); |
1043 | rt6_dst_from_metrics_check(pcpu_rt); | |
9c7370a1 | 1044 | read_unlock_bh(&table->tb6_lock); |
d52d3997 MKL |
1045 | return pcpu_rt; |
1046 | } | |
1047 | ||
9ff74384 DA |
1048 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
1049 | int oif, struct flowi6 *fl6, int flags) | |
1da177e4 | 1050 | { |
367efcb9 | 1051 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1052 | struct rt6_info *rt; |
c71099ac | 1053 | int strict = 0; |
1da177e4 | 1054 | |
77d16f45 | 1055 | strict |= flags & RT6_LOOKUP_F_IFACE; |
d5d32e4b | 1056 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; |
367efcb9 MKL |
1057 | if (net->ipv6.devconf_all->forwarding == 0) |
1058 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1059 | |
c71099ac | 1060 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1061 | |
4c9483b2 | 1062 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1063 | saved_fn = fn; |
1da177e4 | 1064 | |
ca254490 DA |
1065 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1066 | oif = 0; | |
1067 | ||
a3c00e46 | 1068 | redo_rt6_select: |
367efcb9 | 1069 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1070 | if (rt->rt6i_nsiblings) |
367efcb9 | 1071 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1072 | if (rt == net->ipv6.ip6_null_entry) { |
1073 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1074 | if (fn) | |
1075 | goto redo_rt6_select; | |
367efcb9 MKL |
1076 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1077 | /* also consider unreachable route */ | |
1078 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1079 | fn = saved_fn; | |
1080 | goto redo_rt6_select; | |
367efcb9 | 1081 | } |
a3c00e46 MKL |
1082 | } |
1083 | ||
fb9de91e | 1084 | |
3da59bd9 | 1085 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1086 | dst_use(&rt->dst, jiffies); |
1087 | read_unlock_bh(&table->tb6_lock); | |
1088 | ||
1089 | rt6_dst_from_metrics_check(rt); | |
b811580d DA |
1090 | |
1091 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
d52d3997 | 1092 | return rt; |
3da59bd9 MKL |
1093 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1094 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1095 | /* Create a RTF_CACHE clone which will not be | |
1096 | * owned by the fib6 tree. It is for the special case where | |
1097 | * the daddr in the skb during the neighbor look-up is different | |
1098 | * from the fl6->daddr used to look-up route here. | |
1099 | */ | |
1100 | ||
1101 | struct rt6_info *uncached_rt; | |
1102 | ||
d52d3997 MKL |
1103 | dst_use(&rt->dst, jiffies); |
1104 | read_unlock_bh(&table->tb6_lock); | |
1105 | ||
3da59bd9 MKL |
1106 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1107 | dst_release(&rt->dst); | |
c71099ac | 1108 | |
3da59bd9 | 1109 | if (uncached_rt) |
8d0b94af | 1110 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1111 | else |
1112 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1113 | |
3da59bd9 | 1114 | dst_hold(&uncached_rt->dst); |
b811580d DA |
1115 | |
1116 | trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6); | |
3da59bd9 | 1117 | return uncached_rt; |
3da59bd9 | 1118 | |
d52d3997 MKL |
1119 | } else { |
1120 | /* Get a percpu copy */ | |
1121 | ||
1122 | struct rt6_info *pcpu_rt; | |
1123 | ||
1124 | rt->dst.lastuse = jiffies; | |
1125 | rt->dst.__use++; | |
1126 | pcpu_rt = rt6_get_pcpu_route(rt); | |
d52d3997 | 1127 | |
9c7370a1 MKL |
1128 | if (pcpu_rt) { |
1129 | read_unlock_bh(&table->tb6_lock); | |
1130 | } else { | |
1131 | /* We have to do the read_unlock first | |
1132 | * because rt6_make_pcpu_route() may trigger | |
1133 | * ip6_dst_gc() which will take the write_lock. | |
1134 | */ | |
1135 | dst_hold(&rt->dst); | |
1136 | read_unlock_bh(&table->tb6_lock); | |
a73e4195 | 1137 | pcpu_rt = rt6_make_pcpu_route(rt); |
9c7370a1 MKL |
1138 | dst_release(&rt->dst); |
1139 | } | |
d52d3997 | 1140 | |
b811580d | 1141 | trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6); |
d52d3997 | 1142 | return pcpu_rt; |
9c7370a1 | 1143 | |
d52d3997 | 1144 | } |
1da177e4 | 1145 | } |
9ff74384 | 1146 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 1147 | |
8ed67789 | 1148 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1149 | struct flowi6 *fl6, int flags) |
4acad72d | 1150 | { |
4c9483b2 | 1151 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1152 | } |
1153 | ||
d409b847 MB |
1154 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
1155 | struct net_device *dev, | |
1156 | struct flowi6 *fl6, int flags) | |
72331bc0 SL |
1157 | { |
1158 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1159 | flags |= RT6_LOOKUP_F_IFACE; | |
1160 | ||
1161 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1162 | } | |
d409b847 | 1163 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 1164 | |
c71099ac TG |
1165 | void ip6_route_input(struct sk_buff *skb) |
1166 | { | |
b71d1d42 | 1167 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1168 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1169 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1170 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 1171 | struct flowi6 fl6 = { |
e0d56fdd | 1172 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
1173 | .daddr = iph->daddr, |
1174 | .saddr = iph->saddr, | |
6502ca52 | 1175 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1176 | .flowi6_mark = skb->mark, |
1177 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1178 | }; |
adaa70bb | 1179 | |
904af04d | 1180 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1181 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1182 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
06e9d040 | 1183 | skb_dst_drop(skb); |
72331bc0 | 1184 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1185 | } |
1186 | ||
8ed67789 | 1187 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1188 | struct flowi6 *fl6, int flags) |
1da177e4 | 1189 | { |
4c9483b2 | 1190 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1191 | } |
1192 | ||
6f21c96a PA |
1193 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
1194 | struct flowi6 *fl6, int flags) | |
c71099ac | 1195 | { |
d46a9d67 | 1196 | bool any_src; |
c71099ac | 1197 | |
4c1feac5 DA |
1198 | if (rt6_need_strict(&fl6->daddr)) { |
1199 | struct dst_entry *dst; | |
1200 | ||
1201 | dst = l3mdev_link_scope_lookup(net, fl6); | |
1202 | if (dst) | |
1203 | return dst; | |
1204 | } | |
ca254490 | 1205 | |
1fb9489b | 1206 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1207 | |
d46a9d67 | 1208 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 1209 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 1210 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 1211 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1212 | |
d46a9d67 | 1213 | if (!any_src) |
adaa70bb | 1214 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1215 | else if (sk) |
1216 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1217 | |
4c9483b2 | 1218 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1219 | } |
6f21c96a | 1220 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 1221 | |
2774c131 | 1222 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1223 | { |
5c1e6aa3 | 1224 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1225 | struct dst_entry *new = NULL; |
1226 | ||
f5b0a874 | 1227 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1228 | if (rt) { |
0a1f5962 | 1229 | rt6_info_init(rt); |
8104891b | 1230 | |
0a1f5962 | 1231 | new = &rt->dst; |
14e50e57 | 1232 | new->__use = 1; |
352e512c | 1233 | new->input = dst_discard; |
ede2059d | 1234 | new->output = dst_discard_out; |
14e50e57 | 1235 | |
0a1f5962 | 1236 | dst_copy_metrics(new, &ort->dst); |
14e50e57 DM |
1237 | rt->rt6i_idev = ort->rt6i_idev; |
1238 | if (rt->rt6i_idev) | |
1239 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1240 | |
4e3fd7a0 | 1241 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1242 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1243 | rt->rt6i_metric = 0; |
1244 | ||
1245 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1246 | #ifdef CONFIG_IPV6_SUBTREES | |
1247 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1248 | #endif | |
1249 | ||
1250 | dst_free(new); | |
1251 | } | |
1252 | ||
69ead7af DM |
1253 | dst_release(dst_orig); |
1254 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1255 | } |
14e50e57 | 1256 | |
1da177e4 LT |
1257 | /* |
1258 | * Destination cache support functions | |
1259 | */ | |
1260 | ||
4b32b5ad MKL |
1261 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1262 | { | |
1263 | if (rt->dst.from && | |
1264 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1265 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1266 | } | |
1267 | ||
3da59bd9 MKL |
1268 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1269 | { | |
1270 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1271 | return NULL; | |
1272 | ||
1273 | if (rt6_check_expired(rt)) | |
1274 | return NULL; | |
1275 | ||
1276 | return &rt->dst; | |
1277 | } | |
1278 | ||
1279 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1280 | { | |
5973fb1e MKL |
1281 | if (!__rt6_check_expired(rt) && |
1282 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
3da59bd9 MKL |
1283 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) |
1284 | return &rt->dst; | |
1285 | else | |
1286 | return NULL; | |
1287 | } | |
1288 | ||
1da177e4 LT |
1289 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1290 | { | |
1291 | struct rt6_info *rt; | |
1292 | ||
1293 | rt = (struct rt6_info *) dst; | |
1294 | ||
6f3118b5 ND |
1295 | /* All IPV6 dsts are created with ->obsolete set to the value |
1296 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1297 | * into this function always. | |
1298 | */ | |
e3bc10bd | 1299 | |
4b32b5ad MKL |
1300 | rt6_dst_from_metrics_check(rt); |
1301 | ||
02bcf4e0 MKL |
1302 | if (rt->rt6i_flags & RTF_PCPU || |
1303 | (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from)) | |
3da59bd9 MKL |
1304 | return rt6_dst_from_check(rt, cookie); |
1305 | else | |
1306 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1310 | { | |
1311 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1312 | ||
1313 | if (rt) { | |
54c1a859 YH |
1314 | if (rt->rt6i_flags & RTF_CACHE) { |
1315 | if (rt6_check_expired(rt)) { | |
1316 | ip6_del_rt(rt); | |
1317 | dst = NULL; | |
1318 | } | |
1319 | } else { | |
1da177e4 | 1320 | dst_release(dst); |
54c1a859 YH |
1321 | dst = NULL; |
1322 | } | |
1da177e4 | 1323 | } |
54c1a859 | 1324 | return dst; |
1da177e4 LT |
1325 | } |
1326 | ||
1327 | static void ip6_link_failure(struct sk_buff *skb) | |
1328 | { | |
1329 | struct rt6_info *rt; | |
1330 | ||
3ffe533c | 1331 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1332 | |
adf30907 | 1333 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1334 | if (rt) { |
1eb4f758 HFS |
1335 | if (rt->rt6i_flags & RTF_CACHE) { |
1336 | dst_hold(&rt->dst); | |
8e3d5be7 | 1337 | ip6_del_rt(rt); |
1eb4f758 | 1338 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { |
1da177e4 | 1339 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1340 | } |
1da177e4 LT |
1341 | } |
1342 | } | |
1343 | ||
45e4fd26 MKL |
1344 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1345 | { | |
1346 | struct net *net = dev_net(rt->dst.dev); | |
1347 | ||
1348 | rt->rt6i_flags |= RTF_MODIFIED; | |
1349 | rt->rt6i_pmtu = mtu; | |
1350 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1351 | } | |
1352 | ||
0d3f6d29 MKL |
1353 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
1354 | { | |
1355 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1356 | (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node); | |
1357 | } | |
1358 | ||
45e4fd26 MKL |
1359 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
1360 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1361 | { |
67ba4152 | 1362 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1363 | |
45e4fd26 MKL |
1364 | if (rt6->rt6i_flags & RTF_LOCAL) |
1365 | return; | |
81aded24 | 1366 | |
19bda36c XL |
1367 | if (dst_metric_locked(dst, RTAX_MTU)) |
1368 | return; | |
1369 | ||
45e4fd26 MKL |
1370 | dst_confirm(dst); |
1371 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); | |
1372 | if (mtu >= dst_mtu(dst)) | |
1373 | return; | |
9d289715 | 1374 | |
0d3f6d29 | 1375 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 MKL |
1376 | rt6_do_update_pmtu(rt6, mtu); |
1377 | } else { | |
1378 | const struct in6_addr *daddr, *saddr; | |
1379 | struct rt6_info *nrt6; | |
1380 | ||
1381 | if (iph) { | |
1382 | daddr = &iph->daddr; | |
1383 | saddr = &iph->saddr; | |
1384 | } else if (sk) { | |
1385 | daddr = &sk->sk_v6_daddr; | |
1386 | saddr = &inet6_sk(sk)->saddr; | |
1387 | } else { | |
1388 | return; | |
1389 | } | |
1390 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); | |
1391 | if (nrt6) { | |
1392 | rt6_do_update_pmtu(nrt6, mtu); | |
1393 | ||
1394 | /* ip6_ins_rt(nrt6) will bump the | |
1395 | * rt6->rt6i_node->fn_sernum | |
1396 | * which will fail the next rt6_check() and | |
1397 | * invalidate the sk->sk_dst_cache. | |
1398 | */ | |
1399 | ip6_ins_rt(nrt6); | |
1400 | } | |
1da177e4 LT |
1401 | } |
1402 | } | |
1403 | ||
45e4fd26 MKL |
1404 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1405 | struct sk_buff *skb, u32 mtu) | |
1406 | { | |
1407 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1408 | } | |
1409 | ||
42ae66c8 | 1410 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 1411 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
1412 | { |
1413 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1414 | struct dst_entry *dst; | |
1415 | struct flowi6 fl6; | |
1416 | ||
1417 | memset(&fl6, 0, sizeof(fl6)); | |
1418 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1419 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1420 | fl6.daddr = iph->daddr; |
1421 | fl6.saddr = iph->saddr; | |
6502ca52 | 1422 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 1423 | fl6.flowi6_uid = uid; |
81aded24 DM |
1424 | |
1425 | dst = ip6_route_output(net, NULL, &fl6); | |
1426 | if (!dst->error) | |
45e4fd26 | 1427 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1428 | dst_release(dst); |
1429 | } | |
1430 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1431 | ||
1432 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1433 | { | |
33c162a9 MKL |
1434 | struct dst_entry *dst; |
1435 | ||
81aded24 | 1436 | ip6_update_pmtu(skb, sock_net(sk), mtu, |
e2d118a1 | 1437 | sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid); |
33c162a9 MKL |
1438 | |
1439 | dst = __sk_dst_get(sk); | |
1440 | if (!dst || !dst->obsolete || | |
1441 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
1442 | return; | |
1443 | ||
1444 | bh_lock_sock(sk); | |
1445 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
1446 | ip6_datagram_dst_update(sk, false); | |
1447 | bh_unlock_sock(sk); | |
81aded24 DM |
1448 | } |
1449 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1450 | ||
b55b76b2 DJ |
1451 | /* Handle redirects */ |
1452 | struct ip6rd_flowi { | |
1453 | struct flowi6 fl6; | |
1454 | struct in6_addr gateway; | |
1455 | }; | |
1456 | ||
1457 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1458 | struct fib6_table *table, | |
1459 | struct flowi6 *fl6, | |
1460 | int flags) | |
1461 | { | |
1462 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1463 | struct rt6_info *rt; | |
1464 | struct fib6_node *fn; | |
1465 | ||
1466 | /* Get the "current" route for this destination and | |
67c408cf | 1467 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
1468 | * |
1469 | * RFC 4861 specifies that redirects should only be | |
1470 | * accepted if they come from the nexthop to the target. | |
1471 | * Due to the way the routes are chosen, this notion | |
1472 | * is a bit fuzzy and one might need to check all possible | |
1473 | * routes. | |
1474 | */ | |
1475 | ||
1476 | read_lock_bh(&table->tb6_lock); | |
1477 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1478 | restart: | |
1479 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1480 | if (rt6_check_expired(rt)) | |
1481 | continue; | |
1482 | if (rt->dst.error) | |
1483 | break; | |
1484 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1485 | continue; | |
1486 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1487 | continue; | |
1488 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1489 | continue; | |
1490 | break; | |
1491 | } | |
1492 | ||
1493 | if (!rt) | |
1494 | rt = net->ipv6.ip6_null_entry; | |
1495 | else if (rt->dst.error) { | |
1496 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1497 | goto out; |
1498 | } | |
1499 | ||
1500 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1501 | fn = fib6_backtrack(fn, &fl6->saddr); |
1502 | if (fn) | |
1503 | goto restart; | |
b55b76b2 | 1504 | } |
a3c00e46 | 1505 | |
b0a1ba59 | 1506 | out: |
b55b76b2 DJ |
1507 | dst_hold(&rt->dst); |
1508 | ||
1509 | read_unlock_bh(&table->tb6_lock); | |
1510 | ||
b811580d | 1511 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); |
b55b76b2 DJ |
1512 | return rt; |
1513 | }; | |
1514 | ||
1515 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1516 | const struct flowi6 *fl6, | |
1517 | const struct in6_addr *gateway) | |
1518 | { | |
1519 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1520 | struct ip6rd_flowi rdfl; | |
1521 | ||
1522 | rdfl.fl6 = *fl6; | |
1523 | rdfl.gateway = *gateway; | |
1524 | ||
1525 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1526 | flags, __ip6_route_redirect); | |
1527 | } | |
1528 | ||
e2d118a1 LC |
1529 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
1530 | kuid_t uid) | |
3a5ad2ee DM |
1531 | { |
1532 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1533 | struct dst_entry *dst; | |
1534 | struct flowi6 fl6; | |
1535 | ||
1536 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1537 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1538 | fl6.flowi6_oif = oif; |
1539 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1540 | fl6.daddr = iph->daddr; |
1541 | fl6.saddr = iph->saddr; | |
6502ca52 | 1542 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 1543 | fl6.flowi6_uid = uid; |
3a5ad2ee | 1544 | |
b55b76b2 DJ |
1545 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1546 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1547 | dst_release(dst); |
1548 | } | |
1549 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1550 | ||
c92a59ec DJ |
1551 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1552 | u32 mark) | |
1553 | { | |
1554 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1555 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1556 | struct dst_entry *dst; | |
1557 | struct flowi6 fl6; | |
1558 | ||
1559 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1560 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1561 | fl6.flowi6_oif = oif; |
1562 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1563 | fl6.daddr = msg->dest; |
1564 | fl6.saddr = iph->daddr; | |
e2d118a1 | 1565 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
c92a59ec | 1566 | |
b55b76b2 DJ |
1567 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1568 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1569 | dst_release(dst); |
1570 | } | |
1571 | ||
3a5ad2ee DM |
1572 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1573 | { | |
e2d118a1 LC |
1574 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
1575 | sk->sk_uid); | |
3a5ad2ee DM |
1576 | } |
1577 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1578 | ||
0dbaee3b | 1579 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1580 | { |
0dbaee3b DM |
1581 | struct net_device *dev = dst->dev; |
1582 | unsigned int mtu = dst_mtu(dst); | |
1583 | struct net *net = dev_net(dev); | |
1584 | ||
1da177e4 LT |
1585 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1586 | ||
5578689a DL |
1587 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1588 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1589 | |
1590 | /* | |
1ab1457c YH |
1591 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1592 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1593 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1594 | * rely only on pmtu discovery" |
1595 | */ | |
1596 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1597 | mtu = IPV6_MAXPLEN; | |
1598 | return mtu; | |
1599 | } | |
1600 | ||
ebb762f2 | 1601 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1602 | { |
4b32b5ad MKL |
1603 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1604 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1605 | struct inet6_dev *idev; |
618f9bc7 | 1606 | |
4b32b5ad MKL |
1607 | if (mtu) |
1608 | goto out; | |
1609 | ||
1610 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1611 | if (mtu) |
30f78d8e | 1612 | goto out; |
618f9bc7 SK |
1613 | |
1614 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1615 | |
1616 | rcu_read_lock(); | |
1617 | idev = __in6_dev_get(dst->dev); | |
1618 | if (idev) | |
1619 | mtu = idev->cnf.mtu6; | |
1620 | rcu_read_unlock(); | |
1621 | ||
30f78d8e | 1622 | out: |
14972cbd RP |
1623 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1624 | ||
1625 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
1626 | } |
1627 | ||
3b00944c YH |
1628 | static struct dst_entry *icmp6_dst_gc_list; |
1629 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1630 | |
3b00944c | 1631 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1632 | struct flowi6 *fl6) |
1da177e4 | 1633 | { |
87a11578 | 1634 | struct dst_entry *dst; |
1da177e4 LT |
1635 | struct rt6_info *rt; |
1636 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1637 | struct net *net = dev_net(dev); |
1da177e4 | 1638 | |
38308473 | 1639 | if (unlikely(!idev)) |
122bdf67 | 1640 | return ERR_PTR(-ENODEV); |
1da177e4 | 1641 | |
ad706862 | 1642 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 1643 | if (unlikely(!rt)) { |
1da177e4 | 1644 | in6_dev_put(idev); |
87a11578 | 1645 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1646 | goto out; |
1647 | } | |
1648 | ||
8e2ec639 YZ |
1649 | rt->dst.flags |= DST_HOST; |
1650 | rt->dst.output = ip6_output; | |
d8d1f30b | 1651 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1652 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1653 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1654 | rt->rt6i_dst.plen = 128; |
1655 | rt->rt6i_idev = idev; | |
14edd87d | 1656 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1657 | |
3b00944c | 1658 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1659 | rt->dst.next = icmp6_dst_gc_list; |
1660 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1661 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1662 | |
5578689a | 1663 | fib6_force_start_gc(net); |
1da177e4 | 1664 | |
87a11578 DM |
1665 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1666 | ||
1da177e4 | 1667 | out: |
87a11578 | 1668 | return dst; |
1da177e4 LT |
1669 | } |
1670 | ||
3d0f24a7 | 1671 | int icmp6_dst_gc(void) |
1da177e4 | 1672 | { |
e9476e95 | 1673 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1674 | int more = 0; |
1da177e4 | 1675 | |
3b00944c YH |
1676 | spin_lock_bh(&icmp6_dst_lock); |
1677 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1678 | |
1da177e4 LT |
1679 | while ((dst = *pprev) != NULL) { |
1680 | if (!atomic_read(&dst->__refcnt)) { | |
1681 | *pprev = dst->next; | |
1682 | dst_free(dst); | |
1da177e4 LT |
1683 | } else { |
1684 | pprev = &dst->next; | |
3d0f24a7 | 1685 | ++more; |
1da177e4 LT |
1686 | } |
1687 | } | |
1688 | ||
3b00944c | 1689 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1690 | |
3d0f24a7 | 1691 | return more; |
1da177e4 LT |
1692 | } |
1693 | ||
1e493d19 DM |
1694 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1695 | void *arg) | |
1696 | { | |
1697 | struct dst_entry *dst, **pprev; | |
1698 | ||
1699 | spin_lock_bh(&icmp6_dst_lock); | |
1700 | pprev = &icmp6_dst_gc_list; | |
1701 | while ((dst = *pprev) != NULL) { | |
1702 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1703 | if (func(rt, arg)) { | |
1704 | *pprev = dst->next; | |
1705 | dst_free(dst); | |
1706 | } else { | |
1707 | pprev = &dst->next; | |
1708 | } | |
1709 | } | |
1710 | spin_unlock_bh(&icmp6_dst_lock); | |
1711 | } | |
1712 | ||
569d3645 | 1713 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1714 | { |
86393e52 | 1715 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1716 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1717 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1718 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1719 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1720 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1721 | int entries; |
7019b78e | 1722 | |
fc66f95c | 1723 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1724 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1725 | entries <= rt_max_size) |
1da177e4 LT |
1726 | goto out; |
1727 | ||
6891a346 | 1728 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1729 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1730 | entries = dst_entries_get_slow(ops); |
1731 | if (entries < ops->gc_thresh) | |
7019b78e | 1732 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1733 | out: |
7019b78e | 1734 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1735 | return entries > rt_max_size; |
1da177e4 LT |
1736 | } |
1737 | ||
e715b6d3 FW |
1738 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1739 | const struct fib6_config *cfg) | |
1740 | { | |
c3a8d947 | 1741 | bool ecn_ca = false; |
e715b6d3 FW |
1742 | struct nlattr *nla; |
1743 | int remaining; | |
1744 | u32 *mp; | |
1745 | ||
63159f29 | 1746 | if (!cfg->fc_mx) |
e715b6d3 FW |
1747 | return 0; |
1748 | ||
1749 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1750 | if (unlikely(!mp)) | |
1751 | return -ENOMEM; | |
1752 | ||
1753 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1754 | int type = nla_type(nla); | |
1bb14807 | 1755 | u32 val; |
e715b6d3 | 1756 | |
1bb14807 DB |
1757 | if (!type) |
1758 | continue; | |
1759 | if (unlikely(type > RTAX_MAX)) | |
1760 | goto err; | |
ea697639 | 1761 | |
1bb14807 DB |
1762 | if (type == RTAX_CC_ALGO) { |
1763 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 1764 | |
1bb14807 | 1765 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
c3a8d947 | 1766 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
1bb14807 DB |
1767 | if (val == TCP_CA_UNSPEC) |
1768 | goto err; | |
1769 | } else { | |
1770 | val = nla_get_u32(nla); | |
e715b6d3 | 1771 | } |
626abd59 PA |
1772 | if (type == RTAX_HOPLIMIT && val > 255) |
1773 | val = 255; | |
b8d3e416 DB |
1774 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1775 | goto err; | |
1bb14807 DB |
1776 | |
1777 | mp[type - 1] = val; | |
1778 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
1779 | } |
1780 | ||
c3a8d947 DB |
1781 | if (ecn_ca) { |
1782 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
1783 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
1784 | } | |
e715b6d3 | 1785 | |
c3a8d947 | 1786 | mxc->mx = mp; |
e715b6d3 FW |
1787 | return 0; |
1788 | err: | |
1789 | kfree(mp); | |
1790 | return -EINVAL; | |
1791 | } | |
1da177e4 | 1792 | |
8c14586f DA |
1793 | static struct rt6_info *ip6_nh_lookup_table(struct net *net, |
1794 | struct fib6_config *cfg, | |
1795 | const struct in6_addr *gw_addr) | |
1796 | { | |
1797 | struct flowi6 fl6 = { | |
1798 | .flowi6_oif = cfg->fc_ifindex, | |
1799 | .daddr = *gw_addr, | |
1800 | .saddr = cfg->fc_prefsrc, | |
1801 | }; | |
1802 | struct fib6_table *table; | |
1803 | struct rt6_info *rt; | |
d5d32e4b | 1804 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f DA |
1805 | |
1806 | table = fib6_get_table(net, cfg->fc_table); | |
1807 | if (!table) | |
1808 | return NULL; | |
1809 | ||
1810 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
1811 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1812 | ||
1813 | rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags); | |
1814 | ||
1815 | /* if table lookup failed, fall back to full lookup */ | |
1816 | if (rt == net->ipv6.ip6_null_entry) { | |
1817 | ip6_rt_put(rt); | |
1818 | rt = NULL; | |
1819 | } | |
1820 | ||
1821 | return rt; | |
1822 | } | |
1823 | ||
8c5b83f0 | 1824 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg) |
1da177e4 | 1825 | { |
5578689a | 1826 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1827 | struct rt6_info *rt = NULL; |
1828 | struct net_device *dev = NULL; | |
1829 | struct inet6_dev *idev = NULL; | |
c71099ac | 1830 | struct fib6_table *table; |
1da177e4 | 1831 | int addr_type; |
8c5b83f0 | 1832 | int err = -EINVAL; |
1da177e4 | 1833 | |
86872cb5 | 1834 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
8c5b83f0 | 1835 | goto out; |
1da177e4 | 1836 | #ifndef CONFIG_IPV6_SUBTREES |
86872cb5 | 1837 | if (cfg->fc_src_len) |
8c5b83f0 | 1838 | goto out; |
1da177e4 | 1839 | #endif |
86872cb5 | 1840 | if (cfg->fc_ifindex) { |
1da177e4 | 1841 | err = -ENODEV; |
5578689a | 1842 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1843 | if (!dev) |
1844 | goto out; | |
1845 | idev = in6_dev_get(dev); | |
1846 | if (!idev) | |
1847 | goto out; | |
1848 | } | |
1849 | ||
86872cb5 TG |
1850 | if (cfg->fc_metric == 0) |
1851 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1852 | |
d71314b4 | 1853 | err = -ENOBUFS; |
38308473 DM |
1854 | if (cfg->fc_nlinfo.nlh && |
1855 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1856 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1857 | if (!table) { |
f3213831 | 1858 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1859 | table = fib6_new_table(net, cfg->fc_table); |
1860 | } | |
1861 | } else { | |
1862 | table = fib6_new_table(net, cfg->fc_table); | |
1863 | } | |
38308473 DM |
1864 | |
1865 | if (!table) | |
c71099ac | 1866 | goto out; |
c71099ac | 1867 | |
ad706862 MKL |
1868 | rt = ip6_dst_alloc(net, NULL, |
1869 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 1870 | |
38308473 | 1871 | if (!rt) { |
1da177e4 LT |
1872 | err = -ENOMEM; |
1873 | goto out; | |
1874 | } | |
1875 | ||
1716a961 G |
1876 | if (cfg->fc_flags & RTF_EXPIRES) |
1877 | rt6_set_expires(rt, jiffies + | |
1878 | clock_t_to_jiffies(cfg->fc_expires)); | |
1879 | else | |
1880 | rt6_clean_expires(rt); | |
1da177e4 | 1881 | |
86872cb5 TG |
1882 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1883 | cfg->fc_protocol = RTPROT_BOOT; | |
1884 | rt->rt6i_protocol = cfg->fc_protocol; | |
1885 | ||
1886 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1887 | |
1888 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1889 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1890 | else if (cfg->fc_flags & RTF_LOCAL) |
1891 | rt->dst.input = ip6_input; | |
1da177e4 | 1892 | else |
d8d1f30b | 1893 | rt->dst.input = ip6_forward; |
1da177e4 | 1894 | |
d8d1f30b | 1895 | rt->dst.output = ip6_output; |
1da177e4 | 1896 | |
19e42e45 RP |
1897 | if (cfg->fc_encap) { |
1898 | struct lwtunnel_state *lwtstate; | |
1899 | ||
30357d7d | 1900 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd TH |
1901 | cfg->fc_encap, AF_INET6, cfg, |
1902 | &lwtstate); | |
19e42e45 RP |
1903 | if (err) |
1904 | goto out; | |
61adedf3 JB |
1905 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
1906 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
1907 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
1908 | rt->dst.output = lwtunnel_output; | |
25368623 | 1909 | } |
61adedf3 JB |
1910 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
1911 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
1912 | rt->dst.input = lwtunnel_input; | |
25368623 | 1913 | } |
19e42e45 RP |
1914 | } |
1915 | ||
86872cb5 TG |
1916 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1917 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1918 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1919 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1920 | |
1da177e4 | 1921 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1922 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1923 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1924 | #endif |
1925 | ||
86872cb5 | 1926 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1927 | |
1928 | /* We cannot add true routes via loopback here, | |
1929 | they would result in kernel looping; promote them to reject routes | |
1930 | */ | |
86872cb5 | 1931 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1932 | (dev && (dev->flags & IFF_LOOPBACK) && |
1933 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1934 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1935 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1936 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1937 | if (dev) { |
1938 | dev_put(dev); | |
1939 | in6_dev_put(idev); | |
1940 | } | |
5578689a | 1941 | dev = net->loopback_dev; |
1da177e4 LT |
1942 | dev_hold(dev); |
1943 | idev = in6_dev_get(dev); | |
1944 | if (!idev) { | |
1945 | err = -ENODEV; | |
1946 | goto out; | |
1947 | } | |
1948 | } | |
1da177e4 | 1949 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1950 | switch (cfg->fc_type) { |
1951 | case RTN_BLACKHOLE: | |
1952 | rt->dst.error = -EINVAL; | |
ede2059d | 1953 | rt->dst.output = dst_discard_out; |
7150aede | 1954 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1955 | break; |
1956 | case RTN_PROHIBIT: | |
1957 | rt->dst.error = -EACCES; | |
7150aede K |
1958 | rt->dst.output = ip6_pkt_prohibit_out; |
1959 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1960 | break; |
b4949ab2 | 1961 | case RTN_THROW: |
0315e382 | 1962 | case RTN_UNREACHABLE: |
ef2c7d7b | 1963 | default: |
7150aede | 1964 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
1965 | : (cfg->fc_type == RTN_UNREACHABLE) |
1966 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
1967 | rt->dst.output = ip6_pkt_discard_out; |
1968 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1969 | break; |
1970 | } | |
1da177e4 LT |
1971 | goto install_route; |
1972 | } | |
1973 | ||
86872cb5 | 1974 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1975 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1976 | int gwa_type; |
1977 | ||
86872cb5 | 1978 | gw_addr = &cfg->fc_gateway; |
330567b7 | 1979 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
1980 | |
1981 | /* if gw_addr is local we will fail to detect this in case | |
1982 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
1983 | * will return already-added prefix route via interface that | |
1984 | * prefix route was assigned to, which might be non-loopback. | |
1985 | */ | |
1986 | err = -EINVAL; | |
330567b7 FW |
1987 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
1988 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
1989 | dev : NULL, 0, 0)) | |
48ed7b26 FW |
1990 | goto out; |
1991 | ||
4e3fd7a0 | 1992 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1993 | |
1994 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
8c14586f | 1995 | struct rt6_info *grt = NULL; |
1da177e4 LT |
1996 | |
1997 | /* IPv6 strictly inhibits using not link-local | |
1998 | addresses as nexthop address. | |
1999 | Otherwise, router will not able to send redirects. | |
2000 | It is very good, but in some (rare!) circumstances | |
2001 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
2002 | some exceptions. --ANK | |
96d5822c EN |
2003 | We allow IPv4-mapped nexthops to support RFC4798-type |
2004 | addressing | |
1da177e4 | 2005 | */ |
96d5822c EN |
2006 | if (!(gwa_type & (IPV6_ADDR_UNICAST | |
2007 | IPV6_ADDR_MAPPED))) | |
1da177e4 LT |
2008 | goto out; |
2009 | ||
a435a07f | 2010 | if (cfg->fc_table) { |
8c14586f DA |
2011 | grt = ip6_nh_lookup_table(net, cfg, gw_addr); |
2012 | ||
a435a07f VB |
2013 | if (grt) { |
2014 | if (grt->rt6i_flags & RTF_GATEWAY || | |
2015 | (dev && dev != grt->dst.dev)) { | |
2016 | ip6_rt_put(grt); | |
2017 | grt = NULL; | |
2018 | } | |
2019 | } | |
2020 | } | |
2021 | ||
8c14586f DA |
2022 | if (!grt) |
2023 | grt = rt6_lookup(net, gw_addr, NULL, | |
2024 | cfg->fc_ifindex, 1); | |
1da177e4 LT |
2025 | |
2026 | err = -EHOSTUNREACH; | |
38308473 | 2027 | if (!grt) |
1da177e4 LT |
2028 | goto out; |
2029 | if (dev) { | |
d1918542 | 2030 | if (dev != grt->dst.dev) { |
94e187c0 | 2031 | ip6_rt_put(grt); |
1da177e4 LT |
2032 | goto out; |
2033 | } | |
2034 | } else { | |
d1918542 | 2035 | dev = grt->dst.dev; |
1da177e4 LT |
2036 | idev = grt->rt6i_idev; |
2037 | dev_hold(dev); | |
2038 | in6_dev_hold(grt->rt6i_idev); | |
2039 | } | |
38308473 | 2040 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 2041 | err = 0; |
94e187c0 | 2042 | ip6_rt_put(grt); |
1da177e4 LT |
2043 | |
2044 | if (err) | |
2045 | goto out; | |
2046 | } | |
2047 | err = -EINVAL; | |
38308473 | 2048 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2049 | goto out; |
2050 | } | |
2051 | ||
2052 | err = -ENODEV; | |
38308473 | 2053 | if (!dev) |
1da177e4 LT |
2054 | goto out; |
2055 | ||
c3968a85 DW |
2056 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
2057 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
2058 | err = -EINVAL; | |
2059 | goto out; | |
2060 | } | |
4e3fd7a0 | 2061 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
2062 | rt->rt6i_prefsrc.plen = 128; |
2063 | } else | |
2064 | rt->rt6i_prefsrc.plen = 0; | |
2065 | ||
86872cb5 | 2066 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
2067 | |
2068 | install_route: | |
d8d1f30b | 2069 | rt->dst.dev = dev; |
1da177e4 | 2070 | rt->rt6i_idev = idev; |
c71099ac | 2071 | rt->rt6i_table = table; |
63152fc0 | 2072 | |
c346dca1 | 2073 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 2074 | |
8c5b83f0 | 2075 | return rt; |
6b9ea5a6 RP |
2076 | out: |
2077 | if (dev) | |
2078 | dev_put(dev); | |
2079 | if (idev) | |
2080 | in6_dev_put(idev); | |
2081 | if (rt) | |
2082 | dst_free(&rt->dst); | |
2083 | ||
8c5b83f0 | 2084 | return ERR_PTR(err); |
6b9ea5a6 RP |
2085 | } |
2086 | ||
2087 | int ip6_route_add(struct fib6_config *cfg) | |
2088 | { | |
2089 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 2090 | struct rt6_info *rt; |
6b9ea5a6 RP |
2091 | int err; |
2092 | ||
8c5b83f0 RP |
2093 | rt = ip6_route_info_create(cfg); |
2094 | if (IS_ERR(rt)) { | |
2095 | err = PTR_ERR(rt); | |
2096 | rt = NULL; | |
6b9ea5a6 | 2097 | goto out; |
8c5b83f0 | 2098 | } |
6b9ea5a6 | 2099 | |
e715b6d3 FW |
2100 | err = ip6_convert_metrics(&mxc, cfg); |
2101 | if (err) | |
2102 | goto out; | |
1da177e4 | 2103 | |
e715b6d3 FW |
2104 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
2105 | ||
2106 | kfree(mxc.mx); | |
6b9ea5a6 | 2107 | |
e715b6d3 | 2108 | return err; |
1da177e4 | 2109 | out: |
1da177e4 | 2110 | if (rt) |
d8d1f30b | 2111 | dst_free(&rt->dst); |
6b9ea5a6 | 2112 | |
1da177e4 LT |
2113 | return err; |
2114 | } | |
2115 | ||
86872cb5 | 2116 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2117 | { |
2118 | int err; | |
c71099ac | 2119 | struct fib6_table *table; |
d1918542 | 2120 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2121 | |
8e3d5be7 MKL |
2122 | if (rt == net->ipv6.ip6_null_entry || |
2123 | rt->dst.flags & DST_NOCACHE) { | |
6825a26c G |
2124 | err = -ENOENT; |
2125 | goto out; | |
2126 | } | |
6c813a72 | 2127 | |
c71099ac TG |
2128 | table = rt->rt6i_table; |
2129 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 2130 | err = fib6_del(rt, info); |
c71099ac | 2131 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 2132 | |
6825a26c | 2133 | out: |
94e187c0 | 2134 | ip6_rt_put(rt); |
1da177e4 LT |
2135 | return err; |
2136 | } | |
2137 | ||
e0a1ad73 TG |
2138 | int ip6_del_rt(struct rt6_info *rt) |
2139 | { | |
4d1169c1 | 2140 | struct nl_info info = { |
d1918542 | 2141 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2142 | }; |
528c4ceb | 2143 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2144 | } |
2145 | ||
0ae81335 DA |
2146 | static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg) |
2147 | { | |
2148 | struct nl_info *info = &cfg->fc_nlinfo; | |
2149 | struct fib6_table *table; | |
2150 | int err; | |
2151 | ||
2152 | table = rt->rt6i_table; | |
2153 | write_lock_bh(&table->tb6_lock); | |
2154 | ||
2155 | if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) { | |
2156 | struct rt6_info *sibling, *next_sibling; | |
2157 | ||
2158 | list_for_each_entry_safe(sibling, next_sibling, | |
2159 | &rt->rt6i_siblings, | |
2160 | rt6i_siblings) { | |
2161 | err = fib6_del(sibling, info); | |
2162 | if (err) | |
2163 | goto out; | |
2164 | } | |
2165 | } | |
2166 | ||
2167 | err = fib6_del(rt, info); | |
2168 | out: | |
2169 | write_unlock_bh(&table->tb6_lock); | |
2170 | ip6_rt_put(rt); | |
2171 | return err; | |
2172 | } | |
2173 | ||
86872cb5 | 2174 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 2175 | { |
c71099ac | 2176 | struct fib6_table *table; |
1da177e4 LT |
2177 | struct fib6_node *fn; |
2178 | struct rt6_info *rt; | |
2179 | int err = -ESRCH; | |
2180 | ||
5578689a | 2181 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 2182 | if (!table) |
c71099ac TG |
2183 | return err; |
2184 | ||
2185 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 2186 | |
c71099ac | 2187 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
2188 | &cfg->fc_dst, cfg->fc_dst_len, |
2189 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 2190 | |
1da177e4 | 2191 | if (fn) { |
d8d1f30b | 2192 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
2193 | if ((rt->rt6i_flags & RTF_CACHE) && |
2194 | !(cfg->fc_flags & RTF_CACHE)) | |
2195 | continue; | |
86872cb5 | 2196 | if (cfg->fc_ifindex && |
d1918542 DM |
2197 | (!rt->dst.dev || |
2198 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2199 | continue; |
86872cb5 TG |
2200 | if (cfg->fc_flags & RTF_GATEWAY && |
2201 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2202 | continue; |
86872cb5 | 2203 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2204 | continue; |
c2ed1880 M |
2205 | if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol) |
2206 | continue; | |
d8d1f30b | 2207 | dst_hold(&rt->dst); |
c71099ac | 2208 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2209 | |
0ae81335 DA |
2210 | /* if gateway was specified only delete the one hop */ |
2211 | if (cfg->fc_flags & RTF_GATEWAY) | |
2212 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
2213 | ||
2214 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
2215 | } |
2216 | } | |
c71099ac | 2217 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2218 | |
2219 | return err; | |
2220 | } | |
2221 | ||
6700c270 | 2222 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2223 | { |
a6279458 | 2224 | struct netevent_redirect netevent; |
e8599ff4 | 2225 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2226 | struct ndisc_options ndopts; |
2227 | struct inet6_dev *in6_dev; | |
2228 | struct neighbour *neigh; | |
71bcdba0 | 2229 | struct rd_msg *msg; |
6e157b6a DM |
2230 | int optlen, on_link; |
2231 | u8 *lladdr; | |
e8599ff4 | 2232 | |
29a3cad5 | 2233 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2234 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2235 | |
2236 | if (optlen < 0) { | |
6e157b6a | 2237 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2238 | return; |
2239 | } | |
2240 | ||
71bcdba0 | 2241 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2242 | |
71bcdba0 | 2243 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2244 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2245 | return; |
2246 | } | |
2247 | ||
6e157b6a | 2248 | on_link = 0; |
71bcdba0 | 2249 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2250 | on_link = 1; |
71bcdba0 | 2251 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2252 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2253 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2254 | return; |
2255 | } | |
2256 | ||
2257 | in6_dev = __in6_dev_get(skb->dev); | |
2258 | if (!in6_dev) | |
2259 | return; | |
2260 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2261 | return; | |
2262 | ||
2263 | /* RFC2461 8.1: | |
2264 | * The IP source address of the Redirect MUST be the same as the current | |
2265 | * first-hop router for the specified ICMP Destination Address. | |
2266 | */ | |
2267 | ||
f997c55c | 2268 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2269 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2270 | return; | |
2271 | } | |
6e157b6a DM |
2272 | |
2273 | lladdr = NULL; | |
e8599ff4 DM |
2274 | if (ndopts.nd_opts_tgt_lladdr) { |
2275 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2276 | skb->dev); | |
2277 | if (!lladdr) { | |
2278 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2279 | return; | |
2280 | } | |
2281 | } | |
2282 | ||
6e157b6a | 2283 | rt = (struct rt6_info *) dst; |
ec13ad1d | 2284 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 2285 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 2286 | return; |
6e157b6a | 2287 | } |
e8599ff4 | 2288 | |
6e157b6a DM |
2289 | /* Redirect received -> path was valid. |
2290 | * Look, redirects are sent only in response to data packets, | |
2291 | * so that this nexthop apparently is reachable. --ANK | |
2292 | */ | |
2293 | dst_confirm(&rt->dst); | |
a6279458 | 2294 | |
71bcdba0 | 2295 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2296 | if (!neigh) |
2297 | return; | |
a6279458 | 2298 | |
1da177e4 LT |
2299 | /* |
2300 | * We have finally decided to accept it. | |
2301 | */ | |
2302 | ||
f997c55c | 2303 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2304 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2305 | NEIGH_UPDATE_F_OVERRIDE| | |
2306 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
2307 | NEIGH_UPDATE_F_ISROUTER)), |
2308 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 2309 | |
83a09abd | 2310 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2311 | if (!nrt) |
1da177e4 LT |
2312 | goto out; |
2313 | ||
2314 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2315 | if (on_link) | |
2316 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2317 | ||
4e3fd7a0 | 2318 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2319 | |
40e22e8f | 2320 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2321 | goto out; |
2322 | ||
d8d1f30b CG |
2323 | netevent.old = &rt->dst; |
2324 | netevent.new = &nrt->dst; | |
71bcdba0 | 2325 | netevent.daddr = &msg->dest; |
60592833 | 2326 | netevent.neigh = neigh; |
8d71740c TT |
2327 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2328 | ||
38308473 | 2329 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2330 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2331 | ip6_del_rt(rt); |
1da177e4 LT |
2332 | } |
2333 | ||
2334 | out: | |
e8599ff4 | 2335 | neigh_release(neigh); |
6e157b6a DM |
2336 | } |
2337 | ||
1da177e4 LT |
2338 | /* |
2339 | * Misc support functions | |
2340 | */ | |
2341 | ||
4b32b5ad MKL |
2342 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2343 | { | |
2344 | BUG_ON(from->dst.from); | |
2345 | ||
2346 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2347 | dst_hold(&from->dst); | |
2348 | rt->dst.from = &from->dst; | |
2349 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2350 | } | |
2351 | ||
83a09abd MKL |
2352 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2353 | { | |
2354 | rt->dst.input = ort->dst.input; | |
2355 | rt->dst.output = ort->dst.output; | |
2356 | rt->rt6i_dst = ort->rt6i_dst; | |
2357 | rt->dst.error = ort->dst.error; | |
2358 | rt->rt6i_idev = ort->rt6i_idev; | |
2359 | if (rt->rt6i_idev) | |
2360 | in6_dev_hold(rt->rt6i_idev); | |
2361 | rt->dst.lastuse = jiffies; | |
2362 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2363 | rt->rt6i_flags = ort->rt6i_flags; | |
2364 | rt6_set_from(rt, ort); | |
2365 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2366 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2367 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2368 | #endif |
83a09abd MKL |
2369 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2370 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 2371 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
2372 | } |
2373 | ||
70ceb4f5 | 2374 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2375 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 2376 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
2377 | const struct in6_addr *gwaddr, |
2378 | struct net_device *dev) | |
70ceb4f5 | 2379 | { |
830218c1 DA |
2380 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
2381 | int ifindex = dev->ifindex; | |
70ceb4f5 YH |
2382 | struct fib6_node *fn; |
2383 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2384 | struct fib6_table *table; |
2385 | ||
830218c1 | 2386 | table = fib6_get_table(net, tb_id); |
38308473 | 2387 | if (!table) |
c71099ac | 2388 | return NULL; |
70ceb4f5 | 2389 | |
5744dd9b | 2390 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2391 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2392 | if (!fn) |
2393 | goto out; | |
2394 | ||
d8d1f30b | 2395 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2396 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2397 | continue; |
2398 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2399 | continue; | |
2400 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2401 | continue; | |
d8d1f30b | 2402 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2403 | break; |
2404 | } | |
2405 | out: | |
5744dd9b | 2406 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2407 | return rt; |
2408 | } | |
2409 | ||
efa2cea0 | 2410 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 2411 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
2412 | const struct in6_addr *gwaddr, |
2413 | struct net_device *dev, | |
95c96174 | 2414 | unsigned int pref) |
70ceb4f5 | 2415 | { |
86872cb5 | 2416 | struct fib6_config cfg = { |
238fc7ea | 2417 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 2418 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
2419 | .fc_dst_len = prefixlen, |
2420 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2421 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2422 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2423 | .fc_nlinfo.nlh = NULL, |
2424 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2425 | }; |
2426 | ||
830218c1 | 2427 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
2428 | cfg.fc_dst = *prefix; |
2429 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2430 | |
e317da96 YH |
2431 | /* We should treat it as a default route if prefix length is 0. */ |
2432 | if (!prefixlen) | |
86872cb5 | 2433 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2434 | |
86872cb5 | 2435 | ip6_route_add(&cfg); |
70ceb4f5 | 2436 | |
830218c1 | 2437 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
2438 | } |
2439 | #endif | |
2440 | ||
b71d1d42 | 2441 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2442 | { |
830218c1 | 2443 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
1da177e4 | 2444 | struct rt6_info *rt; |
c71099ac | 2445 | struct fib6_table *table; |
1da177e4 | 2446 | |
830218c1 | 2447 | table = fib6_get_table(dev_net(dev), tb_id); |
38308473 | 2448 | if (!table) |
c71099ac | 2449 | return NULL; |
1da177e4 | 2450 | |
5744dd9b | 2451 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2452 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2453 | if (dev == rt->dst.dev && |
045927ff | 2454 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2455 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2456 | break; | |
2457 | } | |
2458 | if (rt) | |
d8d1f30b | 2459 | dst_hold(&rt->dst); |
5744dd9b | 2460 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2461 | return rt; |
2462 | } | |
2463 | ||
b71d1d42 | 2464 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2465 | struct net_device *dev, |
2466 | unsigned int pref) | |
1da177e4 | 2467 | { |
86872cb5 | 2468 | struct fib6_config cfg = { |
ca254490 | 2469 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 2470 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2471 | .fc_ifindex = dev->ifindex, |
2472 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2473 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2474 | .fc_nlinfo.portid = 0, |
5578689a | 2475 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2476 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2477 | }; |
1da177e4 | 2478 | |
4e3fd7a0 | 2479 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2480 | |
830218c1 DA |
2481 | if (!ip6_route_add(&cfg)) { |
2482 | struct fib6_table *table; | |
2483 | ||
2484 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
2485 | if (table) | |
2486 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
2487 | } | |
1da177e4 | 2488 | |
1da177e4 LT |
2489 | return rt6_get_dflt_router(gwaddr, dev); |
2490 | } | |
2491 | ||
830218c1 | 2492 | static void __rt6_purge_dflt_routers(struct fib6_table *table) |
1da177e4 LT |
2493 | { |
2494 | struct rt6_info *rt; | |
2495 | ||
2496 | restart: | |
c71099ac | 2497 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2498 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2499 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2500 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2501 | dst_hold(&rt->dst); |
c71099ac | 2502 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2503 | ip6_del_rt(rt); |
1da177e4 LT |
2504 | goto restart; |
2505 | } | |
2506 | } | |
c71099ac | 2507 | read_unlock_bh(&table->tb6_lock); |
830218c1 DA |
2508 | |
2509 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
2510 | } | |
2511 | ||
2512 | void rt6_purge_dflt_routers(struct net *net) | |
2513 | { | |
2514 | struct fib6_table *table; | |
2515 | struct hlist_head *head; | |
2516 | unsigned int h; | |
2517 | ||
2518 | rcu_read_lock(); | |
2519 | ||
2520 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
2521 | head = &net->ipv6.fib_table_hash[h]; | |
2522 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
2523 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
2524 | __rt6_purge_dflt_routers(table); | |
2525 | } | |
2526 | } | |
2527 | ||
2528 | rcu_read_unlock(); | |
1da177e4 LT |
2529 | } |
2530 | ||
5578689a DL |
2531 | static void rtmsg_to_fib6_config(struct net *net, |
2532 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2533 | struct fib6_config *cfg) |
2534 | { | |
2535 | memset(cfg, 0, sizeof(*cfg)); | |
2536 | ||
ca254490 DA |
2537 | cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? |
2538 | : RT6_TABLE_MAIN; | |
86872cb5 TG |
2539 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
2540 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2541 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2542 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2543 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2544 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2545 | ||
5578689a | 2546 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2547 | |
4e3fd7a0 AD |
2548 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2549 | cfg->fc_src = rtmsg->rtmsg_src; | |
2550 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2551 | } |
2552 | ||
5578689a | 2553 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2554 | { |
86872cb5 | 2555 | struct fib6_config cfg; |
1da177e4 LT |
2556 | struct in6_rtmsg rtmsg; |
2557 | int err; | |
2558 | ||
67ba4152 | 2559 | switch (cmd) { |
1da177e4 LT |
2560 | case SIOCADDRT: /* Add a route */ |
2561 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2562 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2563 | return -EPERM; |
2564 | err = copy_from_user(&rtmsg, arg, | |
2565 | sizeof(struct in6_rtmsg)); | |
2566 | if (err) | |
2567 | return -EFAULT; | |
86872cb5 | 2568 | |
5578689a | 2569 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2570 | |
1da177e4 LT |
2571 | rtnl_lock(); |
2572 | switch (cmd) { | |
2573 | case SIOCADDRT: | |
86872cb5 | 2574 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2575 | break; |
2576 | case SIOCDELRT: | |
86872cb5 | 2577 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2578 | break; |
2579 | default: | |
2580 | err = -EINVAL; | |
2581 | } | |
2582 | rtnl_unlock(); | |
2583 | ||
2584 | return err; | |
3ff50b79 | 2585 | } |
1da177e4 LT |
2586 | |
2587 | return -EINVAL; | |
2588 | } | |
2589 | ||
2590 | /* | |
2591 | * Drop the packet on the floor | |
2592 | */ | |
2593 | ||
d5fdd6ba | 2594 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2595 | { |
612f09e8 | 2596 | int type; |
adf30907 | 2597 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2598 | switch (ipstats_mib_noroutes) { |
2599 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2600 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2601 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2602 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2603 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2604 | break; |
2605 | } | |
2606 | /* FALLTHROUGH */ | |
2607 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2608 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2609 | ipstats_mib_noroutes); | |
612f09e8 YH |
2610 | break; |
2611 | } | |
3ffe533c | 2612 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2613 | kfree_skb(skb); |
2614 | return 0; | |
2615 | } | |
2616 | ||
9ce8ade0 TG |
2617 | static int ip6_pkt_discard(struct sk_buff *skb) |
2618 | { | |
612f09e8 | 2619 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2620 | } |
2621 | ||
ede2059d | 2622 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2623 | { |
adf30907 | 2624 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2625 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2626 | } |
2627 | ||
9ce8ade0 TG |
2628 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2629 | { | |
612f09e8 | 2630 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2631 | } |
2632 | ||
ede2059d | 2633 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2634 | { |
adf30907 | 2635 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2636 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2637 | } |
2638 | ||
1da177e4 LT |
2639 | /* |
2640 | * Allocate a dst for local (unicast / anycast) address. | |
2641 | */ | |
2642 | ||
2643 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2644 | const struct in6_addr *addr, | |
8f031519 | 2645 | bool anycast) |
1da177e4 | 2646 | { |
ca254490 | 2647 | u32 tb_id; |
c346dca1 | 2648 | struct net *net = dev_net(idev->dev); |
5f02ce24 DA |
2649 | struct net_device *dev = net->loopback_dev; |
2650 | struct rt6_info *rt; | |
2651 | ||
2652 | /* use L3 Master device as loopback for host routes if device | |
2653 | * is enslaved and address is not link local or multicast | |
2654 | */ | |
2655 | if (!rt6_need_strict(addr)) | |
2656 | dev = l3mdev_master_dev_rcu(idev->dev) ? : dev; | |
2657 | ||
2658 | rt = ip6_dst_alloc(net, dev, DST_NOCOUNT); | |
a3300ef4 | 2659 | if (!rt) |
1da177e4 LT |
2660 | return ERR_PTR(-ENOMEM); |
2661 | ||
1da177e4 LT |
2662 | in6_dev_hold(idev); |
2663 | ||
11d53b49 | 2664 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2665 | rt->dst.input = ip6_input; |
2666 | rt->dst.output = ip6_output; | |
1da177e4 | 2667 | rt->rt6i_idev = idev; |
1da177e4 | 2668 | |
94b5e0f9 | 2669 | rt->rt6i_protocol = RTPROT_KERNEL; |
1da177e4 | 2670 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
58c4fb86 YH |
2671 | if (anycast) |
2672 | rt->rt6i_flags |= RTF_ANYCAST; | |
2673 | else | |
1da177e4 | 2674 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2675 | |
550bab42 | 2676 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2677 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2678 | rt->rt6i_dst.plen = 128; |
ca254490 DA |
2679 | tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL; |
2680 | rt->rt6i_table = fib6_get_table(net, tb_id); | |
8e3d5be7 | 2681 | rt->dst.flags |= DST_NOCACHE; |
1da177e4 | 2682 | |
d8d1f30b | 2683 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2684 | |
2685 | return rt; | |
2686 | } | |
2687 | ||
c3968a85 DW |
2688 | /* remove deleted ip from prefsrc entries */ |
2689 | struct arg_dev_net_ip { | |
2690 | struct net_device *dev; | |
2691 | struct net *net; | |
2692 | struct in6_addr *addr; | |
2693 | }; | |
2694 | ||
2695 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2696 | { | |
2697 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2698 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2699 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2700 | ||
d1918542 | 2701 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2702 | rt != net->ipv6.ip6_null_entry && |
2703 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2704 | /* remove prefsrc entry */ | |
2705 | rt->rt6i_prefsrc.plen = 0; | |
2706 | } | |
2707 | return 0; | |
2708 | } | |
2709 | ||
2710 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2711 | { | |
2712 | struct net *net = dev_net(ifp->idev->dev); | |
2713 | struct arg_dev_net_ip adni = { | |
2714 | .dev = ifp->idev->dev, | |
2715 | .net = net, | |
2716 | .addr = &ifp->addr, | |
2717 | }; | |
0c3584d5 | 2718 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2719 | } |
2720 | ||
be7a010d DJ |
2721 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2722 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2723 | ||
2724 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2725 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2726 | { | |
2727 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2728 | ||
2729 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2730 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2731 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2732 | return -1; | |
2733 | } | |
2734 | return 0; | |
2735 | } | |
2736 | ||
2737 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2738 | { | |
2739 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2740 | } | |
2741 | ||
8ed67789 DL |
2742 | struct arg_dev_net { |
2743 | struct net_device *dev; | |
2744 | struct net *net; | |
2745 | }; | |
2746 | ||
a1a22c12 | 2747 | /* called with write lock held for table with rt */ |
1da177e4 LT |
2748 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2749 | { | |
bc3ef660 | 2750 | const struct arg_dev_net *adn = arg; |
2751 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2752 | |
d1918542 | 2753 | if ((rt->dst.dev == dev || !dev) && |
a1a22c12 DA |
2754 | rt != adn->net->ipv6.ip6_null_entry && |
2755 | (rt->rt6i_nsiblings == 0 || | |
2756 | !rt->rt6i_idev->cnf.ignore_routes_with_linkdown)) | |
1da177e4 | 2757 | return -1; |
c159d30c | 2758 | |
1da177e4 LT |
2759 | return 0; |
2760 | } | |
2761 | ||
f3db4851 | 2762 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2763 | { |
8ed67789 DL |
2764 | struct arg_dev_net adn = { |
2765 | .dev = dev, | |
2766 | .net = net, | |
2767 | }; | |
2768 | ||
0c3584d5 | 2769 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2770 | icmp6_clean_all(fib6_ifdown, &adn); |
e332bc67 EB |
2771 | if (dev) |
2772 | rt6_uncached_list_flush_dev(net, dev); | |
1da177e4 LT |
2773 | } |
2774 | ||
95c96174 | 2775 | struct rt6_mtu_change_arg { |
1da177e4 | 2776 | struct net_device *dev; |
95c96174 | 2777 | unsigned int mtu; |
1da177e4 LT |
2778 | }; |
2779 | ||
2780 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2781 | { | |
2782 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2783 | struct inet6_dev *idev; | |
2784 | ||
2785 | /* In IPv6 pmtu discovery is not optional, | |
2786 | so that RTAX_MTU lock cannot disable it. | |
2787 | We still use this lock to block changes | |
2788 | caused by addrconf/ndisc. | |
2789 | */ | |
2790 | ||
2791 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2792 | if (!idev) |
1da177e4 LT |
2793 | return 0; |
2794 | ||
2795 | /* For administrative MTU increase, there is no way to discover | |
2796 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2797 | Since RFC 1981 doesn't include administrative MTU increase | |
2798 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2799 | */ | |
2800 | /* | |
2801 | If new MTU is less than route PMTU, this new MTU will be the | |
2802 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2803 | decreases; if new MTU is greater than route PMTU, and the | |
2804 | old MTU is the lowest MTU in the path, update the route PMTU | |
2805 | to reflect the increase. In this case if the other nodes' MTU | |
2806 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
67c408cf | 2807 | PMTU discovery. |
1da177e4 | 2808 | */ |
d1918542 | 2809 | if (rt->dst.dev == arg->dev && |
fb56be83 | 2810 | dst_metric_raw(&rt->dst, RTAX_MTU) && |
4b32b5ad MKL |
2811 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2812 | if (rt->rt6i_flags & RTF_CACHE) { | |
2813 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2814 | * (i.e. a redirected route), | |
2815 | * the metrics of its rt->dst.from has already | |
2816 | * been updated. | |
2817 | */ | |
2818 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2819 | rt->rt6i_pmtu = arg->mtu; | |
2820 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2821 | (dst_mtu(&rt->dst) < arg->mtu && | |
2822 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2823 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2824 | } | |
566cfd8f | 2825 | } |
1da177e4 LT |
2826 | return 0; |
2827 | } | |
2828 | ||
95c96174 | 2829 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2830 | { |
c71099ac TG |
2831 | struct rt6_mtu_change_arg arg = { |
2832 | .dev = dev, | |
2833 | .mtu = mtu, | |
2834 | }; | |
1da177e4 | 2835 | |
0c3584d5 | 2836 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2837 | } |
2838 | ||
ef7c79ed | 2839 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2840 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2841 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2842 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2843 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2844 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2845 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2846 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2847 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2848 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 2849 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 2850 | [RTA_UID] = { .type = NLA_U32 }, |
86872cb5 TG |
2851 | }; |
2852 | ||
2853 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2854 | struct fib6_config *cfg) | |
1da177e4 | 2855 | { |
86872cb5 TG |
2856 | struct rtmsg *rtm; |
2857 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2858 | unsigned int pref; |
86872cb5 | 2859 | int err; |
1da177e4 | 2860 | |
86872cb5 TG |
2861 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2862 | if (err < 0) | |
2863 | goto errout; | |
1da177e4 | 2864 | |
86872cb5 TG |
2865 | err = -EINVAL; |
2866 | rtm = nlmsg_data(nlh); | |
2867 | memset(cfg, 0, sizeof(*cfg)); | |
2868 | ||
2869 | cfg->fc_table = rtm->rtm_table; | |
2870 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2871 | cfg->fc_src_len = rtm->rtm_src_len; | |
2872 | cfg->fc_flags = RTF_UP; | |
2873 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2874 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2875 | |
ef2c7d7b ND |
2876 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2877 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2878 | rtm->rtm_type == RTN_PROHIBIT || |
2879 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2880 | cfg->fc_flags |= RTF_REJECT; |
2881 | ||
ab79ad14 MŻ |
2882 | if (rtm->rtm_type == RTN_LOCAL) |
2883 | cfg->fc_flags |= RTF_LOCAL; | |
2884 | ||
1f56a01f MKL |
2885 | if (rtm->rtm_flags & RTM_F_CLONED) |
2886 | cfg->fc_flags |= RTF_CACHE; | |
2887 | ||
15e47304 | 2888 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2889 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2890 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2891 | |
2892 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2893 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2894 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2895 | } |
86872cb5 TG |
2896 | |
2897 | if (tb[RTA_DST]) { | |
2898 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2899 | ||
2900 | if (nla_len(tb[RTA_DST]) < plen) | |
2901 | goto errout; | |
2902 | ||
2903 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2904 | } |
86872cb5 TG |
2905 | |
2906 | if (tb[RTA_SRC]) { | |
2907 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2908 | ||
2909 | if (nla_len(tb[RTA_SRC]) < plen) | |
2910 | goto errout; | |
2911 | ||
2912 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2913 | } |
86872cb5 | 2914 | |
c3968a85 | 2915 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2916 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2917 | |
86872cb5 TG |
2918 | if (tb[RTA_OIF]) |
2919 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2920 | ||
2921 | if (tb[RTA_PRIORITY]) | |
2922 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2923 | ||
2924 | if (tb[RTA_METRICS]) { | |
2925 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2926 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2927 | } |
86872cb5 TG |
2928 | |
2929 | if (tb[RTA_TABLE]) | |
2930 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2931 | ||
51ebd318 ND |
2932 | if (tb[RTA_MULTIPATH]) { |
2933 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2934 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
2935 | |
2936 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
2937 | cfg->fc_mp_len); | |
2938 | if (err < 0) | |
2939 | goto errout; | |
51ebd318 ND |
2940 | } |
2941 | ||
c78ba6d6 LR |
2942 | if (tb[RTA_PREF]) { |
2943 | pref = nla_get_u8(tb[RTA_PREF]); | |
2944 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2945 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2946 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
2947 | cfg->fc_flags |= RTF_PREF(pref); | |
2948 | } | |
2949 | ||
19e42e45 RP |
2950 | if (tb[RTA_ENCAP]) |
2951 | cfg->fc_encap = tb[RTA_ENCAP]; | |
2952 | ||
9ed59592 | 2953 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
2954 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
2955 | ||
9ed59592 DA |
2956 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type); |
2957 | if (err < 0) | |
2958 | goto errout; | |
2959 | } | |
2960 | ||
32bc201e XL |
2961 | if (tb[RTA_EXPIRES]) { |
2962 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
2963 | ||
2964 | if (addrconf_finite_timeout(timeout)) { | |
2965 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
2966 | cfg->fc_flags |= RTF_EXPIRES; | |
2967 | } | |
2968 | } | |
2969 | ||
86872cb5 TG |
2970 | err = 0; |
2971 | errout: | |
2972 | return err; | |
1da177e4 LT |
2973 | } |
2974 | ||
6b9ea5a6 RP |
2975 | struct rt6_nh { |
2976 | struct rt6_info *rt6_info; | |
2977 | struct fib6_config r_cfg; | |
2978 | struct mx6_config mxc; | |
2979 | struct list_head next; | |
2980 | }; | |
2981 | ||
2982 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
2983 | { | |
2984 | struct rt6_nh *nh; | |
2985 | ||
2986 | list_for_each_entry(nh, rt6_nh_list, next) { | |
2987 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n", | |
2988 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, | |
2989 | nh->r_cfg.fc_ifindex); | |
2990 | } | |
2991 | } | |
2992 | ||
2993 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
2994 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
2995 | { | |
2996 | struct rt6_nh *nh; | |
2997 | struct rt6_info *rtnh; | |
2998 | int err = -EEXIST; | |
2999 | ||
3000 | list_for_each_entry(nh, rt6_nh_list, next) { | |
3001 | /* check if rt6_info already exists */ | |
3002 | rtnh = nh->rt6_info; | |
3003 | ||
3004 | if (rtnh->dst.dev == rt->dst.dev && | |
3005 | rtnh->rt6i_idev == rt->rt6i_idev && | |
3006 | ipv6_addr_equal(&rtnh->rt6i_gateway, | |
3007 | &rt->rt6i_gateway)) | |
3008 | return err; | |
3009 | } | |
3010 | ||
3011 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
3012 | if (!nh) | |
3013 | return -ENOMEM; | |
3014 | nh->rt6_info = rt; | |
3015 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
3016 | if (err) { | |
3017 | kfree(nh); | |
3018 | return err; | |
3019 | } | |
3020 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
3021 | list_add_tail(&nh->next, rt6_nh_list); | |
3022 | ||
3023 | return 0; | |
3024 | } | |
3025 | ||
3b1137fe DA |
3026 | static void ip6_route_mpath_notify(struct rt6_info *rt, |
3027 | struct rt6_info *rt_last, | |
3028 | struct nl_info *info, | |
3029 | __u16 nlflags) | |
3030 | { | |
3031 | /* if this is an APPEND route, then rt points to the first route | |
3032 | * inserted and rt_last points to last route inserted. Userspace | |
3033 | * wants a consistent dump of the route which starts at the first | |
3034 | * nexthop. Since sibling routes are always added at the end of | |
3035 | * the list, find the first sibling of the last route appended | |
3036 | */ | |
3037 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) { | |
3038 | rt = list_first_entry(&rt_last->rt6i_siblings, | |
3039 | struct rt6_info, | |
3040 | rt6i_siblings); | |
3041 | } | |
3042 | ||
3043 | if (rt) | |
3044 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
3045 | } | |
3046 | ||
6b9ea5a6 | 3047 | static int ip6_route_multipath_add(struct fib6_config *cfg) |
51ebd318 | 3048 | { |
3b1137fe DA |
3049 | struct rt6_info *rt_notif = NULL, *rt_last = NULL; |
3050 | struct nl_info *info = &cfg->fc_nlinfo; | |
51ebd318 ND |
3051 | struct fib6_config r_cfg; |
3052 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
3053 | struct rt6_info *rt; |
3054 | struct rt6_nh *err_nh; | |
3055 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 3056 | __u16 nlflags; |
51ebd318 ND |
3057 | int remaining; |
3058 | int attrlen; | |
6b9ea5a6 RP |
3059 | int err = 1; |
3060 | int nhn = 0; | |
3061 | int replace = (cfg->fc_nlinfo.nlh && | |
3062 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
3063 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 3064 | |
3b1137fe DA |
3065 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
3066 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
3067 | nlflags |= NLM_F_APPEND; | |
3068 | ||
35f1b4e9 | 3069 | remaining = cfg->fc_mp_len; |
51ebd318 | 3070 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 3071 | |
6b9ea5a6 RP |
3072 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
3073 | * rt6_info structs per nexthop | |
3074 | */ | |
51ebd318 ND |
3075 | while (rtnh_ok(rtnh, remaining)) { |
3076 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3077 | if (rtnh->rtnh_ifindex) | |
3078 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3079 | ||
3080 | attrlen = rtnh_attrlen(rtnh); | |
3081 | if (attrlen > 0) { | |
3082 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3083 | ||
3084 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3085 | if (nla) { | |
67b61f6c | 3086 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
3087 | r_cfg.fc_flags |= RTF_GATEWAY; |
3088 | } | |
19e42e45 RP |
3089 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
3090 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
3091 | if (nla) | |
3092 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 3093 | } |
6b9ea5a6 | 3094 | |
8c5b83f0 RP |
3095 | rt = ip6_route_info_create(&r_cfg); |
3096 | if (IS_ERR(rt)) { | |
3097 | err = PTR_ERR(rt); | |
3098 | rt = NULL; | |
6b9ea5a6 | 3099 | goto cleanup; |
8c5b83f0 | 3100 | } |
6b9ea5a6 RP |
3101 | |
3102 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 3103 | if (err) { |
6b9ea5a6 RP |
3104 | dst_free(&rt->dst); |
3105 | goto cleanup; | |
3106 | } | |
3107 | ||
3108 | rtnh = rtnh_next(rtnh, &remaining); | |
3109 | } | |
3110 | ||
3b1137fe DA |
3111 | /* for add and replace send one notification with all nexthops. |
3112 | * Skip the notification in fib6_add_rt2node and send one with | |
3113 | * the full route when done | |
3114 | */ | |
3115 | info->skip_notify = 1; | |
3116 | ||
6b9ea5a6 RP |
3117 | err_nh = NULL; |
3118 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3b1137fe DA |
3119 | rt_last = nh->rt6_info; |
3120 | err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc); | |
3121 | /* save reference to first route for notification */ | |
3122 | if (!rt_notif && !err) | |
3123 | rt_notif = nh->rt6_info; | |
3124 | ||
6b9ea5a6 RP |
3125 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ |
3126 | nh->rt6_info = NULL; | |
3127 | if (err) { | |
3128 | if (replace && nhn) | |
3129 | ip6_print_replace_route_err(&rt6_nh_list); | |
3130 | err_nh = nh; | |
3131 | goto add_errout; | |
51ebd318 | 3132 | } |
6b9ea5a6 | 3133 | |
1a72418b | 3134 | /* Because each route is added like a single route we remove |
27596472 MK |
3135 | * these flags after the first nexthop: if there is a collision, |
3136 | * we have already failed to add the first nexthop: | |
3137 | * fib6_add_rt2node() has rejected it; when replacing, old | |
3138 | * nexthops have been replaced by first new, the rest should | |
3139 | * be added to it. | |
1a72418b | 3140 | */ |
27596472 MK |
3141 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
3142 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
3143 | nhn++; |
3144 | } | |
3145 | ||
3b1137fe DA |
3146 | /* success ... tell user about new route */ |
3147 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
3148 | goto cleanup; |
3149 | ||
3150 | add_errout: | |
3b1137fe DA |
3151 | /* send notification for routes that were added so that |
3152 | * the delete notifications sent by ip6_route_del are | |
3153 | * coherent | |
3154 | */ | |
3155 | if (rt_notif) | |
3156 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
3157 | ||
6b9ea5a6 RP |
3158 | /* Delete routes that were already added */ |
3159 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3160 | if (err_nh == nh) | |
3161 | break; | |
3162 | ip6_route_del(&nh->r_cfg); | |
3163 | } | |
3164 | ||
3165 | cleanup: | |
3166 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
3167 | if (nh->rt6_info) | |
3168 | dst_free(&nh->rt6_info->dst); | |
52fe51f8 | 3169 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
3170 | list_del(&nh->next); |
3171 | kfree(nh); | |
3172 | } | |
3173 | ||
3174 | return err; | |
3175 | } | |
3176 | ||
3177 | static int ip6_route_multipath_del(struct fib6_config *cfg) | |
3178 | { | |
3179 | struct fib6_config r_cfg; | |
3180 | struct rtnexthop *rtnh; | |
3181 | int remaining; | |
3182 | int attrlen; | |
3183 | int err = 1, last_err = 0; | |
3184 | ||
3185 | remaining = cfg->fc_mp_len; | |
3186 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
3187 | ||
3188 | /* Parse a Multipath Entry */ | |
3189 | while (rtnh_ok(rtnh, remaining)) { | |
3190 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3191 | if (rtnh->rtnh_ifindex) | |
3192 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3193 | ||
3194 | attrlen = rtnh_attrlen(rtnh); | |
3195 | if (attrlen > 0) { | |
3196 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3197 | ||
3198 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3199 | if (nla) { | |
3200 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
3201 | r_cfg.fc_flags |= RTF_GATEWAY; | |
3202 | } | |
3203 | } | |
3204 | err = ip6_route_del(&r_cfg); | |
3205 | if (err) | |
3206 | last_err = err; | |
3207 | ||
51ebd318 ND |
3208 | rtnh = rtnh_next(rtnh, &remaining); |
3209 | } | |
3210 | ||
3211 | return last_err; | |
3212 | } | |
3213 | ||
67ba4152 | 3214 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 3215 | { |
86872cb5 TG |
3216 | struct fib6_config cfg; |
3217 | int err; | |
1da177e4 | 3218 | |
86872cb5 TG |
3219 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3220 | if (err < 0) | |
3221 | return err; | |
3222 | ||
51ebd318 | 3223 | if (cfg.fc_mp) |
6b9ea5a6 | 3224 | return ip6_route_multipath_del(&cfg); |
0ae81335 DA |
3225 | else { |
3226 | cfg.fc_delete_all_nh = 1; | |
51ebd318 | 3227 | return ip6_route_del(&cfg); |
0ae81335 | 3228 | } |
1da177e4 LT |
3229 | } |
3230 | ||
67ba4152 | 3231 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 3232 | { |
86872cb5 TG |
3233 | struct fib6_config cfg; |
3234 | int err; | |
1da177e4 | 3235 | |
86872cb5 TG |
3236 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3237 | if (err < 0) | |
3238 | return err; | |
3239 | ||
51ebd318 | 3240 | if (cfg.fc_mp) |
6b9ea5a6 | 3241 | return ip6_route_multipath_add(&cfg); |
51ebd318 ND |
3242 | else |
3243 | return ip6_route_add(&cfg); | |
1da177e4 LT |
3244 | } |
3245 | ||
beb1afac | 3246 | static size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f | 3247 | { |
beb1afac DA |
3248 | int nexthop_len = 0; |
3249 | ||
3250 | if (rt->rt6i_nsiblings) { | |
3251 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
3252 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
3253 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3254 | + nla_total_size(4) /* RTA_OIF */ | |
3255 | + lwtunnel_get_encap_size(rt->dst.lwtstate); | |
3256 | ||
3257 | nexthop_len *= rt->rt6i_nsiblings; | |
3258 | } | |
3259 | ||
339bf98f TG |
3260 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
3261 | + nla_total_size(16) /* RTA_SRC */ | |
3262 | + nla_total_size(16) /* RTA_DST */ | |
3263 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3264 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3265 | + nla_total_size(4) /* RTA_TABLE */ | |
3266 | + nla_total_size(4) /* RTA_IIF */ | |
3267 | + nla_total_size(4) /* RTA_OIF */ | |
3268 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3269 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3270 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3271 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3272 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
3273 | + lwtunnel_get_encap_size(rt->dst.lwtstate) |
3274 | + nexthop_len; | |
3275 | } | |
3276 | ||
3277 | static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt, | |
3278 | unsigned int *flags) | |
3279 | { | |
3280 | if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) { | |
3281 | *flags |= RTNH_F_LINKDOWN; | |
3282 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) | |
3283 | *flags |= RTNH_F_DEAD; | |
3284 | } | |
3285 | ||
3286 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
3287 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) | |
3288 | goto nla_put_failure; | |
3289 | } | |
3290 | ||
3291 | if (rt->dst.dev && | |
3292 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
3293 | goto nla_put_failure; | |
3294 | ||
3295 | if (rt->dst.lwtstate && | |
3296 | lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0) | |
3297 | goto nla_put_failure; | |
3298 | ||
3299 | return 0; | |
3300 | ||
3301 | nla_put_failure: | |
3302 | return -EMSGSIZE; | |
3303 | } | |
3304 | ||
3305 | static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt) | |
3306 | { | |
3307 | struct rtnexthop *rtnh; | |
3308 | unsigned int flags = 0; | |
3309 | ||
3310 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); | |
3311 | if (!rtnh) | |
3312 | goto nla_put_failure; | |
3313 | ||
3314 | rtnh->rtnh_hops = 0; | |
3315 | rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0; | |
3316 | ||
3317 | if (rt6_nexthop_info(skb, rt, &flags) < 0) | |
3318 | goto nla_put_failure; | |
3319 | ||
3320 | rtnh->rtnh_flags = flags; | |
3321 | ||
3322 | /* length of rtnetlink header + attributes */ | |
3323 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
3324 | ||
3325 | return 0; | |
3326 | ||
3327 | nla_put_failure: | |
3328 | return -EMSGSIZE; | |
339bf98f TG |
3329 | } |
3330 | ||
191cd582 BH |
3331 | static int rt6_fill_node(struct net *net, |
3332 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 3333 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 3334 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 3335 | unsigned int flags) |
1da177e4 | 3336 | { |
4b32b5ad | 3337 | u32 metrics[RTAX_MAX]; |
1da177e4 | 3338 | struct rtmsg *rtm; |
2d7202bf | 3339 | struct nlmsghdr *nlh; |
e3703b3d | 3340 | long expires; |
9e762a4a | 3341 | u32 table; |
1da177e4 | 3342 | |
15e47304 | 3343 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 3344 | if (!nlh) |
26932566 | 3345 | return -EMSGSIZE; |
2d7202bf TG |
3346 | |
3347 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
3348 | rtm->rtm_family = AF_INET6; |
3349 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
3350 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
3351 | rtm->rtm_tos = 0; | |
c71099ac | 3352 | if (rt->rt6i_table) |
9e762a4a | 3353 | table = rt->rt6i_table->tb6_id; |
c71099ac | 3354 | else |
9e762a4a PM |
3355 | table = RT6_TABLE_UNSPEC; |
3356 | rtm->rtm_table = table; | |
c78679e8 DM |
3357 | if (nla_put_u32(skb, RTA_TABLE, table)) |
3358 | goto nla_put_failure; | |
ef2c7d7b ND |
3359 | if (rt->rt6i_flags & RTF_REJECT) { |
3360 | switch (rt->dst.error) { | |
3361 | case -EINVAL: | |
3362 | rtm->rtm_type = RTN_BLACKHOLE; | |
3363 | break; | |
3364 | case -EACCES: | |
3365 | rtm->rtm_type = RTN_PROHIBIT; | |
3366 | break; | |
b4949ab2 ND |
3367 | case -EAGAIN: |
3368 | rtm->rtm_type = RTN_THROW; | |
3369 | break; | |
ef2c7d7b ND |
3370 | default: |
3371 | rtm->rtm_type = RTN_UNREACHABLE; | |
3372 | break; | |
3373 | } | |
3374 | } | |
38308473 | 3375 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 3376 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 3377 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
3378 | rtm->rtm_type = RTN_LOCAL; |
3379 | else | |
3380 | rtm->rtm_type = RTN_UNICAST; | |
3381 | rtm->rtm_flags = 0; | |
3382 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
3383 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 3384 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 3385 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
3386 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
3387 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
3388 | rtm->rtm_protocol = RTPROT_RA; | |
3389 | else | |
3390 | rtm->rtm_protocol = RTPROT_KERNEL; | |
3391 | } | |
1da177e4 | 3392 | |
38308473 | 3393 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
3394 | rtm->rtm_flags |= RTM_F_CLONED; |
3395 | ||
3396 | if (dst) { | |
930345ea | 3397 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 3398 | goto nla_put_failure; |
1ab1457c | 3399 | rtm->rtm_dst_len = 128; |
1da177e4 | 3400 | } else if (rtm->rtm_dst_len) |
930345ea | 3401 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 3402 | goto nla_put_failure; |
1da177e4 LT |
3403 | #ifdef CONFIG_IPV6_SUBTREES |
3404 | if (src) { | |
930345ea | 3405 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 3406 | goto nla_put_failure; |
1ab1457c | 3407 | rtm->rtm_src_len = 128; |
c78679e8 | 3408 | } else if (rtm->rtm_src_len && |
930345ea | 3409 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 3410 | goto nla_put_failure; |
1da177e4 | 3411 | #endif |
7bc570c8 YH |
3412 | if (iif) { |
3413 | #ifdef CONFIG_IPV6_MROUTE | |
3414 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
fd61c6ba DA |
3415 | int err = ip6mr_get_route(net, skb, rtm, portid); |
3416 | ||
3417 | if (err == 0) | |
3418 | return 0; | |
3419 | if (err < 0) | |
3420 | goto nla_put_failure; | |
7bc570c8 YH |
3421 | } else |
3422 | #endif | |
c78679e8 DM |
3423 | if (nla_put_u32(skb, RTA_IIF, iif)) |
3424 | goto nla_put_failure; | |
7bc570c8 | 3425 | } else if (dst) { |
1da177e4 | 3426 | struct in6_addr saddr_buf; |
c78679e8 | 3427 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 3428 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3429 | goto nla_put_failure; |
1da177e4 | 3430 | } |
2d7202bf | 3431 | |
c3968a85 DW |
3432 | if (rt->rt6i_prefsrc.plen) { |
3433 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 3434 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 3435 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3436 | goto nla_put_failure; |
c3968a85 DW |
3437 | } |
3438 | ||
4b32b5ad MKL |
3439 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
3440 | if (rt->rt6i_pmtu) | |
3441 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
3442 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
3443 | goto nla_put_failure; |
3444 | ||
c78679e8 DM |
3445 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) |
3446 | goto nla_put_failure; | |
8253947e | 3447 | |
beb1afac DA |
3448 | /* For multipath routes, walk the siblings list and add |
3449 | * each as a nexthop within RTA_MULTIPATH. | |
3450 | */ | |
3451 | if (rt->rt6i_nsiblings) { | |
3452 | struct rt6_info *sibling, *next_sibling; | |
3453 | struct nlattr *mp; | |
3454 | ||
3455 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
3456 | if (!mp) | |
3457 | goto nla_put_failure; | |
3458 | ||
3459 | if (rt6_add_nexthop(skb, rt) < 0) | |
3460 | goto nla_put_failure; | |
3461 | ||
3462 | list_for_each_entry_safe(sibling, next_sibling, | |
3463 | &rt->rt6i_siblings, rt6i_siblings) { | |
3464 | if (rt6_add_nexthop(skb, sibling) < 0) | |
3465 | goto nla_put_failure; | |
3466 | } | |
3467 | ||
3468 | nla_nest_end(skb, mp); | |
3469 | } else { | |
3470 | if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags) < 0) | |
3471 | goto nla_put_failure; | |
3472 | } | |
3473 | ||
8253947e | 3474 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; |
69cdf8f9 | 3475 | |
87a50699 | 3476 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 3477 | goto nla_put_failure; |
2d7202bf | 3478 | |
c78ba6d6 LR |
3479 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
3480 | goto nla_put_failure; | |
3481 | ||
19e42e45 | 3482 | |
053c095a JB |
3483 | nlmsg_end(skb, nlh); |
3484 | return 0; | |
2d7202bf TG |
3485 | |
3486 | nla_put_failure: | |
26932566 PM |
3487 | nlmsg_cancel(skb, nlh); |
3488 | return -EMSGSIZE; | |
1da177e4 LT |
3489 | } |
3490 | ||
1b43af54 | 3491 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
3492 | { |
3493 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
1f17e2f2 DA |
3494 | struct net *net = arg->net; |
3495 | ||
3496 | if (rt == net->ipv6.ip6_null_entry) | |
3497 | return 0; | |
1da177e4 | 3498 | |
2d7202bf TG |
3499 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
3500 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
f8cfe2ce DA |
3501 | |
3502 | /* user wants prefix routes only */ | |
3503 | if (rtm->rtm_flags & RTM_F_PREFIX && | |
3504 | !(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
3505 | /* success since this is not a prefix route */ | |
3506 | return 1; | |
3507 | } | |
3508 | } | |
1da177e4 | 3509 | |
1f17e2f2 | 3510 | return rt6_fill_node(net, |
191cd582 | 3511 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, |
15e47304 | 3512 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
f8cfe2ce | 3513 | NLM_F_MULTI); |
1da177e4 LT |
3514 | } |
3515 | ||
67ba4152 | 3516 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 3517 | { |
3b1e0a65 | 3518 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
3519 | struct nlattr *tb[RTA_MAX+1]; |
3520 | struct rt6_info *rt; | |
1da177e4 | 3521 | struct sk_buff *skb; |
ab364a6f | 3522 | struct rtmsg *rtm; |
4c9483b2 | 3523 | struct flowi6 fl6; |
72331bc0 | 3524 | int err, iif = 0, oif = 0; |
1da177e4 | 3525 | |
ab364a6f TG |
3526 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
3527 | if (err < 0) | |
3528 | goto errout; | |
1da177e4 | 3529 | |
ab364a6f | 3530 | err = -EINVAL; |
4c9483b2 | 3531 | memset(&fl6, 0, sizeof(fl6)); |
38b7097b HFS |
3532 | rtm = nlmsg_data(nlh); |
3533 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
1da177e4 | 3534 | |
ab364a6f TG |
3535 | if (tb[RTA_SRC]) { |
3536 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3537 | goto errout; | |
3538 | ||
4e3fd7a0 | 3539 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3540 | } |
3541 | ||
3542 | if (tb[RTA_DST]) { | |
3543 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3544 | goto errout; | |
3545 | ||
4e3fd7a0 | 3546 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3547 | } |
3548 | ||
3549 | if (tb[RTA_IIF]) | |
3550 | iif = nla_get_u32(tb[RTA_IIF]); | |
3551 | ||
3552 | if (tb[RTA_OIF]) | |
72331bc0 | 3553 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3554 | |
2e47b291 LC |
3555 | if (tb[RTA_MARK]) |
3556 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3557 | ||
622ec2c9 LC |
3558 | if (tb[RTA_UID]) |
3559 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
3560 | nla_get_u32(tb[RTA_UID])); | |
3561 | else | |
3562 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
3563 | ||
1da177e4 LT |
3564 | if (iif) { |
3565 | struct net_device *dev; | |
72331bc0 SL |
3566 | int flags = 0; |
3567 | ||
5578689a | 3568 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3569 | if (!dev) { |
3570 | err = -ENODEV; | |
ab364a6f | 3571 | goto errout; |
1da177e4 | 3572 | } |
72331bc0 SL |
3573 | |
3574 | fl6.flowi6_iif = iif; | |
3575 | ||
3576 | if (!ipv6_addr_any(&fl6.saddr)) | |
3577 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3578 | ||
3579 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3580 | flags); | |
3581 | } else { | |
3582 | fl6.flowi6_oif = oif; | |
3583 | ||
3584 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
3585 | } |
3586 | ||
ab364a6f | 3587 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3588 | if (!skb) { |
94e187c0 | 3589 | ip6_rt_put(rt); |
ab364a6f TG |
3590 | err = -ENOBUFS; |
3591 | goto errout; | |
3592 | } | |
1da177e4 | 3593 | |
d8d1f30b | 3594 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3595 | |
4c9483b2 | 3596 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3597 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
f8cfe2ce | 3598 | nlh->nlmsg_seq, 0); |
1da177e4 | 3599 | if (err < 0) { |
ab364a6f TG |
3600 | kfree_skb(skb); |
3601 | goto errout; | |
1da177e4 LT |
3602 | } |
3603 | ||
15e47304 | 3604 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3605 | errout: |
1da177e4 | 3606 | return err; |
1da177e4 LT |
3607 | } |
3608 | ||
37a1d361 RP |
3609 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
3610 | unsigned int nlm_flags) | |
1da177e4 LT |
3611 | { |
3612 | struct sk_buff *skb; | |
5578689a | 3613 | struct net *net = info->nl_net; |
528c4ceb DL |
3614 | u32 seq; |
3615 | int err; | |
3616 | ||
3617 | err = -ENOBUFS; | |
38308473 | 3618 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3619 | |
19e42e45 | 3620 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3621 | if (!skb) |
21713ebc TG |
3622 | goto errout; |
3623 | ||
191cd582 | 3624 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
f8cfe2ce | 3625 | event, info->portid, seq, nlm_flags); |
26932566 PM |
3626 | if (err < 0) { |
3627 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3628 | WARN_ON(err == -EMSGSIZE); | |
3629 | kfree_skb(skb); | |
3630 | goto errout; | |
3631 | } | |
15e47304 | 3632 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3633 | info->nlh, gfp_any()); |
3634 | return; | |
21713ebc TG |
3635 | errout: |
3636 | if (err < 0) | |
5578689a | 3637 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3638 | } |
3639 | ||
8ed67789 | 3640 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3641 | unsigned long event, void *ptr) |
8ed67789 | 3642 | { |
351638e7 | 3643 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3644 | struct net *net = dev_net(dev); |
8ed67789 DL |
3645 | |
3646 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 3647 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3648 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3649 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3650 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3651 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3652 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
3653 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
3654 | #endif | |
3655 | } | |
3656 | ||
3657 | return NOTIFY_OK; | |
3658 | } | |
3659 | ||
1da177e4 LT |
3660 | /* |
3661 | * /proc | |
3662 | */ | |
3663 | ||
3664 | #ifdef CONFIG_PROC_FS | |
3665 | ||
33120b30 AD |
3666 | static const struct file_operations ipv6_route_proc_fops = { |
3667 | .owner = THIS_MODULE, | |
3668 | .open = ipv6_route_open, | |
3669 | .read = seq_read, | |
3670 | .llseek = seq_lseek, | |
8d2ca1d7 | 3671 | .release = seq_release_net, |
33120b30 AD |
3672 | }; |
3673 | ||
1da177e4 LT |
3674 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3675 | { | |
69ddb805 | 3676 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3677 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3678 | net->ipv6.rt6_stats->fib_nodes, |
3679 | net->ipv6.rt6_stats->fib_route_nodes, | |
3680 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3681 | net->ipv6.rt6_stats->fib_rt_entries, | |
3682 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3683 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3684 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3685 | |
3686 | return 0; | |
3687 | } | |
3688 | ||
3689 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3690 | { | |
de05c557 | 3691 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3692 | } |
3693 | ||
9a32144e | 3694 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3695 | .owner = THIS_MODULE, |
3696 | .open = rt6_stats_seq_open, | |
3697 | .read = seq_read, | |
3698 | .llseek = seq_lseek, | |
b6fcbdb4 | 3699 | .release = single_release_net, |
1da177e4 LT |
3700 | }; |
3701 | #endif /* CONFIG_PROC_FS */ | |
3702 | ||
3703 | #ifdef CONFIG_SYSCTL | |
3704 | ||
1da177e4 | 3705 | static |
fe2c6338 | 3706 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3707 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3708 | { | |
c486da34 LAG |
3709 | struct net *net; |
3710 | int delay; | |
3711 | if (!write) | |
1da177e4 | 3712 | return -EINVAL; |
c486da34 LAG |
3713 | |
3714 | net = (struct net *)ctl->extra1; | |
3715 | delay = net->ipv6.sysctl.flush_delay; | |
3716 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3717 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3718 | return 0; |
1da177e4 LT |
3719 | } |
3720 | ||
fe2c6338 | 3721 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3722 | { |
1da177e4 | 3723 | .procname = "flush", |
4990509f | 3724 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3725 | .maxlen = sizeof(int), |
89c8b3a1 | 3726 | .mode = 0200, |
6d9f239a | 3727 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3728 | }, |
3729 | { | |
1da177e4 | 3730 | .procname = "gc_thresh", |
9a7ec3a9 | 3731 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3732 | .maxlen = sizeof(int), |
3733 | .mode = 0644, | |
6d9f239a | 3734 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3735 | }, |
3736 | { | |
1da177e4 | 3737 | .procname = "max_size", |
4990509f | 3738 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3739 | .maxlen = sizeof(int), |
3740 | .mode = 0644, | |
6d9f239a | 3741 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3742 | }, |
3743 | { | |
1da177e4 | 3744 | .procname = "gc_min_interval", |
4990509f | 3745 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3746 | .maxlen = sizeof(int), |
3747 | .mode = 0644, | |
6d9f239a | 3748 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3749 | }, |
3750 | { | |
1da177e4 | 3751 | .procname = "gc_timeout", |
4990509f | 3752 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3753 | .maxlen = sizeof(int), |
3754 | .mode = 0644, | |
6d9f239a | 3755 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3756 | }, |
3757 | { | |
1da177e4 | 3758 | .procname = "gc_interval", |
4990509f | 3759 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3760 | .maxlen = sizeof(int), |
3761 | .mode = 0644, | |
6d9f239a | 3762 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3763 | }, |
3764 | { | |
1da177e4 | 3765 | .procname = "gc_elasticity", |
4990509f | 3766 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3767 | .maxlen = sizeof(int), |
3768 | .mode = 0644, | |
f3d3f616 | 3769 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3770 | }, |
3771 | { | |
1da177e4 | 3772 | .procname = "mtu_expires", |
4990509f | 3773 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3774 | .maxlen = sizeof(int), |
3775 | .mode = 0644, | |
6d9f239a | 3776 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3777 | }, |
3778 | { | |
1da177e4 | 3779 | .procname = "min_adv_mss", |
4990509f | 3780 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3781 | .maxlen = sizeof(int), |
3782 | .mode = 0644, | |
f3d3f616 | 3783 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3784 | }, |
3785 | { | |
1da177e4 | 3786 | .procname = "gc_min_interval_ms", |
4990509f | 3787 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3788 | .maxlen = sizeof(int), |
3789 | .mode = 0644, | |
6d9f239a | 3790 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3791 | }, |
f8572d8f | 3792 | { } |
1da177e4 LT |
3793 | }; |
3794 | ||
2c8c1e72 | 3795 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3796 | { |
3797 | struct ctl_table *table; | |
3798 | ||
3799 | table = kmemdup(ipv6_route_table_template, | |
3800 | sizeof(ipv6_route_table_template), | |
3801 | GFP_KERNEL); | |
5ee09105 YH |
3802 | |
3803 | if (table) { | |
3804 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3805 | table[0].extra1 = net; |
86393e52 | 3806 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3807 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3808 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3809 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3810 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3811 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3812 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3813 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3814 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3815 | |
3816 | /* Don't export sysctls to unprivileged users */ | |
3817 | if (net->user_ns != &init_user_ns) | |
3818 | table[0].procname = NULL; | |
5ee09105 YH |
3819 | } |
3820 | ||
760f2d01 DL |
3821 | return table; |
3822 | } | |
1da177e4 LT |
3823 | #endif |
3824 | ||
2c8c1e72 | 3825 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3826 | { |
633d424b | 3827 | int ret = -ENOMEM; |
8ed67789 | 3828 | |
86393e52 AD |
3829 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3830 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3831 | |
fc66f95c ED |
3832 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3833 | goto out_ip6_dst_ops; | |
3834 | ||
8ed67789 DL |
3835 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3836 | sizeof(*net->ipv6.ip6_null_entry), | |
3837 | GFP_KERNEL); | |
3838 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3839 | goto out_ip6_dst_entries; |
d8d1f30b | 3840 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3841 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3842 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3843 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3844 | ip6_template_metrics, true); | |
8ed67789 DL |
3845 | |
3846 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3847 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3848 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3849 | GFP_KERNEL); | |
68fffc67 PZ |
3850 | if (!net->ipv6.ip6_prohibit_entry) |
3851 | goto out_ip6_null_entry; | |
d8d1f30b | 3852 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3853 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3854 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3855 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3856 | ip6_template_metrics, true); | |
8ed67789 DL |
3857 | |
3858 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3859 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3860 | GFP_KERNEL); | |
68fffc67 PZ |
3861 | if (!net->ipv6.ip6_blk_hole_entry) |
3862 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3863 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3864 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3865 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3866 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3867 | ip6_template_metrics, true); | |
8ed67789 DL |
3868 | #endif |
3869 | ||
b339a47c PZ |
3870 | net->ipv6.sysctl.flush_delay = 0; |
3871 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3872 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3873 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3874 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3875 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3876 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3877 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3878 | ||
6891a346 BT |
3879 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3880 | ||
8ed67789 DL |
3881 | ret = 0; |
3882 | out: | |
3883 | return ret; | |
f2fc6a54 | 3884 | |
68fffc67 PZ |
3885 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3886 | out_ip6_prohibit_entry: | |
3887 | kfree(net->ipv6.ip6_prohibit_entry); | |
3888 | out_ip6_null_entry: | |
3889 | kfree(net->ipv6.ip6_null_entry); | |
3890 | #endif | |
fc66f95c ED |
3891 | out_ip6_dst_entries: |
3892 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3893 | out_ip6_dst_ops: |
f2fc6a54 | 3894 | goto out; |
cdb18761 DL |
3895 | } |
3896 | ||
2c8c1e72 | 3897 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3898 | { |
8ed67789 DL |
3899 | kfree(net->ipv6.ip6_null_entry); |
3900 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3901 | kfree(net->ipv6.ip6_prohibit_entry); | |
3902 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3903 | #endif | |
41bb78b4 | 3904 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3905 | } |
3906 | ||
d189634e TG |
3907 | static int __net_init ip6_route_net_init_late(struct net *net) |
3908 | { | |
3909 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3910 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3911 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3912 | #endif |
3913 | return 0; | |
3914 | } | |
3915 | ||
3916 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3917 | { | |
3918 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3919 | remove_proc_entry("ipv6_route", net->proc_net); |
3920 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3921 | #endif |
3922 | } | |
3923 | ||
cdb18761 DL |
3924 | static struct pernet_operations ip6_route_net_ops = { |
3925 | .init = ip6_route_net_init, | |
3926 | .exit = ip6_route_net_exit, | |
3927 | }; | |
3928 | ||
c3426b47 DM |
3929 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3930 | { | |
3931 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3932 | ||
3933 | if (!bp) | |
3934 | return -ENOMEM; | |
3935 | inet_peer_base_init(bp); | |
3936 | net->ipv6.peers = bp; | |
3937 | return 0; | |
3938 | } | |
3939 | ||
3940 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3941 | { | |
3942 | struct inet_peer_base *bp = net->ipv6.peers; | |
3943 | ||
3944 | net->ipv6.peers = NULL; | |
56a6b248 | 3945 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3946 | kfree(bp); |
3947 | } | |
3948 | ||
2b823f72 | 3949 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3950 | .init = ipv6_inetpeer_init, |
3951 | .exit = ipv6_inetpeer_exit, | |
3952 | }; | |
3953 | ||
d189634e TG |
3954 | static struct pernet_operations ip6_route_net_late_ops = { |
3955 | .init = ip6_route_net_init_late, | |
3956 | .exit = ip6_route_net_exit_late, | |
3957 | }; | |
3958 | ||
8ed67789 DL |
3959 | static struct notifier_block ip6_route_dev_notifier = { |
3960 | .notifier_call = ip6_route_dev_notify, | |
3961 | .priority = 0, | |
3962 | }; | |
3963 | ||
433d49c3 | 3964 | int __init ip6_route_init(void) |
1da177e4 | 3965 | { |
433d49c3 | 3966 | int ret; |
8d0b94af | 3967 | int cpu; |
433d49c3 | 3968 | |
9a7ec3a9 DL |
3969 | ret = -ENOMEM; |
3970 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3971 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3972 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3973 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3974 | goto out; |
14e50e57 | 3975 | |
fc66f95c | 3976 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3977 | if (ret) |
bdb3289f | 3978 | goto out_kmem_cache; |
bdb3289f | 3979 | |
c3426b47 DM |
3980 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3981 | if (ret) | |
e8803b6c | 3982 | goto out_dst_entries; |
2a0c451a | 3983 | |
7e52b33b DM |
3984 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3985 | if (ret) | |
3986 | goto out_register_inetpeer; | |
c3426b47 | 3987 | |
5dc121e9 AE |
3988 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3989 | ||
8ed67789 DL |
3990 | /* Registering of the loopback is done before this portion of code, |
3991 | * the loopback reference in rt6_info will not be taken, do it | |
3992 | * manually for init_net */ | |
d8d1f30b | 3993 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3994 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3995 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3996 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3997 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3998 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3999 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
4000 | #endif | |
e8803b6c | 4001 | ret = fib6_init(); |
433d49c3 | 4002 | if (ret) |
8ed67789 | 4003 | goto out_register_subsys; |
433d49c3 | 4004 | |
433d49c3 DL |
4005 | ret = xfrm6_init(); |
4006 | if (ret) | |
e8803b6c | 4007 | goto out_fib6_init; |
c35b7e72 | 4008 | |
433d49c3 DL |
4009 | ret = fib6_rules_init(); |
4010 | if (ret) | |
4011 | goto xfrm6_init; | |
7e5449c2 | 4012 | |
d189634e TG |
4013 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
4014 | if (ret) | |
4015 | goto fib6_rules_init; | |
4016 | ||
433d49c3 | 4017 | ret = -ENOBUFS; |
c7ac8679 GR |
4018 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
4019 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
4020 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 4021 | goto out_register_late_subsys; |
c127ea2c | 4022 | |
8ed67789 | 4023 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 4024 | if (ret) |
d189634e | 4025 | goto out_register_late_subsys; |
8ed67789 | 4026 | |
8d0b94af MKL |
4027 | for_each_possible_cpu(cpu) { |
4028 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
4029 | ||
4030 | INIT_LIST_HEAD(&ul->head); | |
4031 | spin_lock_init(&ul->lock); | |
4032 | } | |
4033 | ||
433d49c3 DL |
4034 | out: |
4035 | return ret; | |
4036 | ||
d189634e TG |
4037 | out_register_late_subsys: |
4038 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 4039 | fib6_rules_init: |
433d49c3 DL |
4040 | fib6_rules_cleanup(); |
4041 | xfrm6_init: | |
433d49c3 | 4042 | xfrm6_fini(); |
2a0c451a TG |
4043 | out_fib6_init: |
4044 | fib6_gc_cleanup(); | |
8ed67789 DL |
4045 | out_register_subsys: |
4046 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
4047 | out_register_inetpeer: |
4048 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
4049 | out_dst_entries: |
4050 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 4051 | out_kmem_cache: |
f2fc6a54 | 4052 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 4053 | goto out; |
1da177e4 LT |
4054 | } |
4055 | ||
4056 | void ip6_route_cleanup(void) | |
4057 | { | |
8ed67789 | 4058 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 4059 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 4060 | fib6_rules_cleanup(); |
1da177e4 | 4061 | xfrm6_fini(); |
1da177e4 | 4062 | fib6_gc_cleanup(); |
c3426b47 | 4063 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 4064 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 4065 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 4066 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 4067 | } |