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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); |
16a16cd3 DA |
101 | static size_t rt6_nlmsg_size(struct rt6_info *rt); |
102 | static int rt6_fill_node(struct net *net, | |
103 | struct sk_buff *skb, struct rt6_info *rt, | |
104 | struct in6_addr *dst, struct in6_addr *src, | |
105 | int iif, int type, u32 portid, u32 seq, | |
106 | unsigned int flags); | |
1da177e4 | 107 | |
70ceb4f5 | 108 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 109 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 110 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
111 | const struct in6_addr *gwaddr, |
112 | struct net_device *dev, | |
95c96174 | 113 | unsigned int pref); |
efa2cea0 | 114 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 115 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
116 | const struct in6_addr *gwaddr, |
117 | struct net_device *dev); | |
70ceb4f5 YH |
118 | #endif |
119 | ||
8d0b94af MKL |
120 | struct uncached_list { |
121 | spinlock_t lock; | |
122 | struct list_head head; | |
123 | }; | |
124 | ||
125 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
126 | ||
127 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
128 | { | |
129 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
130 | ||
131 | rt->dst.flags |= DST_NOCACHE; | |
132 | rt->rt6i_uncached_list = ul; | |
133 | ||
134 | spin_lock_bh(&ul->lock); | |
135 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
136 | spin_unlock_bh(&ul->lock); | |
137 | } | |
138 | ||
139 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
140 | { | |
141 | if (!list_empty(&rt->rt6i_uncached)) { | |
142 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
143 | ||
144 | spin_lock_bh(&ul->lock); | |
145 | list_del(&rt->rt6i_uncached); | |
146 | spin_unlock_bh(&ul->lock); | |
147 | } | |
148 | } | |
149 | ||
150 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
151 | { | |
152 | struct net_device *loopback_dev = net->loopback_dev; | |
153 | int cpu; | |
154 | ||
e332bc67 EB |
155 | if (dev == loopback_dev) |
156 | return; | |
157 | ||
8d0b94af MKL |
158 | for_each_possible_cpu(cpu) { |
159 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
160 | struct rt6_info *rt; | |
161 | ||
162 | spin_lock_bh(&ul->lock); | |
163 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
164 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
165 | struct net_device *rt_dev = rt->dst.dev; | |
166 | ||
e332bc67 | 167 | if (rt_idev->dev == dev) { |
8d0b94af MKL |
168 | rt->rt6i_idev = in6_dev_get(loopback_dev); |
169 | in6_dev_put(rt_idev); | |
170 | } | |
171 | ||
e332bc67 | 172 | if (rt_dev == dev) { |
8d0b94af MKL |
173 | rt->dst.dev = loopback_dev; |
174 | dev_hold(rt->dst.dev); | |
175 | dev_put(rt_dev); | |
176 | } | |
177 | } | |
178 | spin_unlock_bh(&ul->lock); | |
179 | } | |
180 | } | |
181 | ||
d52d3997 MKL |
182 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
183 | { | |
184 | return dst_metrics_write_ptr(rt->dst.from); | |
185 | } | |
186 | ||
06582540 DM |
187 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
188 | { | |
4b32b5ad | 189 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 190 | |
d52d3997 MKL |
191 | if (rt->rt6i_flags & RTF_PCPU) |
192 | return rt6_pcpu_cow_metrics(rt); | |
193 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
194 | return NULL; |
195 | else | |
3b471175 | 196 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
197 | } |
198 | ||
f894cbf8 DM |
199 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
200 | struct sk_buff *skb, | |
201 | const void *daddr) | |
39232973 DM |
202 | { |
203 | struct in6_addr *p = &rt->rt6i_gateway; | |
204 | ||
a7563f34 | 205 | if (!ipv6_addr_any(p)) |
39232973 | 206 | return (const void *) p; |
f894cbf8 DM |
207 | else if (skb) |
208 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
209 | return daddr; |
210 | } | |
211 | ||
f894cbf8 DM |
212 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
213 | struct sk_buff *skb, | |
214 | const void *daddr) | |
d3aaeb38 | 215 | { |
39232973 DM |
216 | struct rt6_info *rt = (struct rt6_info *) dst; |
217 | struct neighbour *n; | |
218 | ||
f894cbf8 | 219 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 220 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
221 | if (n) |
222 | return n; | |
223 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
224 | } | |
225 | ||
63fca65d JA |
226 | static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
227 | { | |
228 | struct net_device *dev = dst->dev; | |
229 | struct rt6_info *rt = (struct rt6_info *)dst; | |
230 | ||
231 | daddr = choose_neigh_daddr(rt, NULL, daddr); | |
232 | if (!daddr) | |
233 | return; | |
234 | if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) | |
235 | return; | |
236 | if (ipv6_addr_is_multicast((const struct in6_addr *)daddr)) | |
237 | return; | |
238 | __ipv6_confirm_neigh(dev, daddr); | |
239 | } | |
240 | ||
9a7ec3a9 | 241 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 242 | .family = AF_INET6, |
1da177e4 LT |
243 | .gc = ip6_dst_gc, |
244 | .gc_thresh = 1024, | |
245 | .check = ip6_dst_check, | |
0dbaee3b | 246 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 247 | .mtu = ip6_mtu, |
06582540 | 248 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
249 | .destroy = ip6_dst_destroy, |
250 | .ifdown = ip6_dst_ifdown, | |
251 | .negative_advice = ip6_negative_advice, | |
252 | .link_failure = ip6_link_failure, | |
253 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 254 | .redirect = rt6_do_redirect, |
9f8955cc | 255 | .local_out = __ip6_local_out, |
d3aaeb38 | 256 | .neigh_lookup = ip6_neigh_lookup, |
63fca65d | 257 | .confirm_neigh = ip6_confirm_neigh, |
1da177e4 LT |
258 | }; |
259 | ||
ebb762f2 | 260 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 261 | { |
618f9bc7 SK |
262 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
263 | ||
264 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
265 | } |
266 | ||
6700c270 DM |
267 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
268 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
269 | { |
270 | } | |
271 | ||
6700c270 DM |
272 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
273 | struct sk_buff *skb) | |
b587ee3b DM |
274 | { |
275 | } | |
276 | ||
14e50e57 DM |
277 | static struct dst_ops ip6_dst_blackhole_ops = { |
278 | .family = AF_INET6, | |
14e50e57 DM |
279 | .destroy = ip6_dst_destroy, |
280 | .check = ip6_dst_check, | |
ebb762f2 | 281 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 282 | .default_advmss = ip6_default_advmss, |
14e50e57 | 283 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 284 | .redirect = ip6_rt_blackhole_redirect, |
0a1f5962 | 285 | .cow_metrics = dst_cow_metrics_generic, |
d3aaeb38 | 286 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
287 | }; |
288 | ||
62fa8a84 | 289 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 290 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
291 | }; |
292 | ||
fb0af4c7 | 293 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
294 | .dst = { |
295 | .__refcnt = ATOMIC_INIT(1), | |
296 | .__use = 1, | |
2c20cbd7 | 297 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 298 | .error = -ENETUNREACH, |
d8d1f30b CG |
299 | .input = ip6_pkt_discard, |
300 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
301 | }, |
302 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 303 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
304 | .rt6i_metric = ~(u32) 0, |
305 | .rt6i_ref = ATOMIC_INIT(1), | |
306 | }; | |
307 | ||
101367c2 TG |
308 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
309 | ||
fb0af4c7 | 310 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
311 | .dst = { |
312 | .__refcnt = ATOMIC_INIT(1), | |
313 | .__use = 1, | |
2c20cbd7 | 314 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 315 | .error = -EACCES, |
d8d1f30b CG |
316 | .input = ip6_pkt_prohibit, |
317 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
318 | }, |
319 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 320 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
321 | .rt6i_metric = ~(u32) 0, |
322 | .rt6i_ref = ATOMIC_INIT(1), | |
323 | }; | |
324 | ||
fb0af4c7 | 325 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
326 | .dst = { |
327 | .__refcnt = ATOMIC_INIT(1), | |
328 | .__use = 1, | |
2c20cbd7 | 329 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 330 | .error = -EINVAL, |
d8d1f30b | 331 | .input = dst_discard, |
ede2059d | 332 | .output = dst_discard_out, |
101367c2 TG |
333 | }, |
334 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 335 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
336 | .rt6i_metric = ~(u32) 0, |
337 | .rt6i_ref = ATOMIC_INIT(1), | |
338 | }; | |
339 | ||
340 | #endif | |
341 | ||
ebfa45f0 MKL |
342 | static void rt6_info_init(struct rt6_info *rt) |
343 | { | |
344 | struct dst_entry *dst = &rt->dst; | |
345 | ||
346 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
347 | INIT_LIST_HEAD(&rt->rt6i_siblings); | |
348 | INIT_LIST_HEAD(&rt->rt6i_uncached); | |
349 | } | |
350 | ||
1da177e4 | 351 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
352 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
353 | struct net_device *dev, | |
ad706862 | 354 | int flags) |
1da177e4 | 355 | { |
97bab73f | 356 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 357 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 358 | |
ebfa45f0 MKL |
359 | if (rt) |
360 | rt6_info_init(rt); | |
8104891b | 361 | |
cf911662 | 362 | return rt; |
1da177e4 LT |
363 | } |
364 | ||
9ab179d8 DA |
365 | struct rt6_info *ip6_dst_alloc(struct net *net, |
366 | struct net_device *dev, | |
367 | int flags) | |
d52d3997 | 368 | { |
ad706862 | 369 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags); |
d52d3997 MKL |
370 | |
371 | if (rt) { | |
372 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
373 | if (rt->rt6i_pcpu) { | |
374 | int cpu; | |
375 | ||
376 | for_each_possible_cpu(cpu) { | |
377 | struct rt6_info **p; | |
378 | ||
379 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
380 | /* no one shares rt */ | |
381 | *p = NULL; | |
382 | } | |
383 | } else { | |
384 | dst_destroy((struct dst_entry *)rt); | |
385 | return NULL; | |
386 | } | |
387 | } | |
388 | ||
389 | return rt; | |
390 | } | |
9ab179d8 | 391 | EXPORT_SYMBOL(ip6_dst_alloc); |
d52d3997 | 392 | |
1da177e4 LT |
393 | static void ip6_dst_destroy(struct dst_entry *dst) |
394 | { | |
395 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 396 | struct dst_entry *from = dst->from; |
8d0b94af | 397 | struct inet6_dev *idev; |
1da177e4 | 398 | |
4b32b5ad | 399 | dst_destroy_metrics_generic(dst); |
87775312 | 400 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
401 | rt6_uncached_list_del(rt); |
402 | ||
403 | idev = rt->rt6i_idev; | |
38308473 | 404 | if (idev) { |
1da177e4 LT |
405 | rt->rt6i_idev = NULL; |
406 | in6_dev_put(idev); | |
1ab1457c | 407 | } |
1716a961 | 408 | |
ecd98837 YH |
409 | dst->from = NULL; |
410 | dst_release(from); | |
b3419363 DM |
411 | } |
412 | ||
1da177e4 LT |
413 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
414 | int how) | |
415 | { | |
416 | struct rt6_info *rt = (struct rt6_info *)dst; | |
417 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 418 | struct net_device *loopback_dev = |
c346dca1 | 419 | dev_net(dev)->loopback_dev; |
1da177e4 | 420 | |
97cac082 DM |
421 | if (dev != loopback_dev) { |
422 | if (idev && idev->dev == dev) { | |
423 | struct inet6_dev *loopback_idev = | |
424 | in6_dev_get(loopback_dev); | |
425 | if (loopback_idev) { | |
426 | rt->rt6i_idev = loopback_idev; | |
427 | in6_dev_put(idev); | |
428 | } | |
429 | } | |
1da177e4 LT |
430 | } |
431 | } | |
432 | ||
5973fb1e MKL |
433 | static bool __rt6_check_expired(const struct rt6_info *rt) |
434 | { | |
435 | if (rt->rt6i_flags & RTF_EXPIRES) | |
436 | return time_after(jiffies, rt->dst.expires); | |
437 | else | |
438 | return false; | |
439 | } | |
440 | ||
a50feda5 | 441 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 442 | { |
1716a961 G |
443 | if (rt->rt6i_flags & RTF_EXPIRES) { |
444 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 445 | return true; |
1716a961 | 446 | } else if (rt->dst.from) { |
3fd91fb3 | 447 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 448 | } |
a50feda5 | 449 | return false; |
1da177e4 LT |
450 | } |
451 | ||
51ebd318 ND |
452 | /* Multipath route selection: |
453 | * Hash based function using packet header and flowlabel. | |
454 | * Adapted from fib_info_hashfn() | |
455 | */ | |
456 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
457 | const struct flowi6 *fl6) | |
458 | { | |
644d0e65 | 459 | return get_hash_from_flowi6(fl6) % candidate_count; |
51ebd318 ND |
460 | } |
461 | ||
462 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
463 | struct flowi6 *fl6, int oif, |
464 | int strict) | |
51ebd318 ND |
465 | { |
466 | struct rt6_info *sibling, *next_sibling; | |
467 | int route_choosen; | |
468 | ||
469 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
470 | /* Don't change the route, if route_choosen == 0 | |
471 | * (siblings does not include ourself) | |
472 | */ | |
473 | if (route_choosen) | |
474 | list_for_each_entry_safe(sibling, next_sibling, | |
475 | &match->rt6i_siblings, rt6i_siblings) { | |
476 | route_choosen--; | |
477 | if (route_choosen == 0) { | |
52bd4c0c ND |
478 | if (rt6_score_route(sibling, oif, strict) < 0) |
479 | break; | |
51ebd318 ND |
480 | match = sibling; |
481 | break; | |
482 | } | |
483 | } | |
484 | return match; | |
485 | } | |
486 | ||
1da177e4 | 487 | /* |
c71099ac | 488 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
489 | */ |
490 | ||
8ed67789 DL |
491 | static inline struct rt6_info *rt6_device_match(struct net *net, |
492 | struct rt6_info *rt, | |
b71d1d42 | 493 | const struct in6_addr *saddr, |
1da177e4 | 494 | int oif, |
d420895e | 495 | int flags) |
1da177e4 LT |
496 | { |
497 | struct rt6_info *local = NULL; | |
498 | struct rt6_info *sprt; | |
499 | ||
dd3abc4e YH |
500 | if (!oif && ipv6_addr_any(saddr)) |
501 | goto out; | |
502 | ||
d8d1f30b | 503 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 504 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
505 | |
506 | if (oif) { | |
1da177e4 LT |
507 | if (dev->ifindex == oif) |
508 | return sprt; | |
509 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 510 | if (!sprt->rt6i_idev || |
1da177e4 | 511 | sprt->rt6i_idev->dev->ifindex != oif) { |
17fb0b2b | 512 | if (flags & RT6_LOOKUP_F_IFACE) |
1da177e4 | 513 | continue; |
17fb0b2b DA |
514 | if (local && |
515 | local->rt6i_idev->dev->ifindex == oif) | |
1da177e4 LT |
516 | continue; |
517 | } | |
518 | local = sprt; | |
519 | } | |
dd3abc4e YH |
520 | } else { |
521 | if (ipv6_chk_addr(net, saddr, dev, | |
522 | flags & RT6_LOOKUP_F_IFACE)) | |
523 | return sprt; | |
1da177e4 | 524 | } |
dd3abc4e | 525 | } |
1da177e4 | 526 | |
dd3abc4e | 527 | if (oif) { |
1da177e4 LT |
528 | if (local) |
529 | return local; | |
530 | ||
d420895e | 531 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 532 | return net->ipv6.ip6_null_entry; |
1da177e4 | 533 | } |
dd3abc4e | 534 | out: |
1da177e4 LT |
535 | return rt; |
536 | } | |
537 | ||
27097255 | 538 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
539 | struct __rt6_probe_work { |
540 | struct work_struct work; | |
541 | struct in6_addr target; | |
542 | struct net_device *dev; | |
543 | }; | |
544 | ||
545 | static void rt6_probe_deferred(struct work_struct *w) | |
546 | { | |
547 | struct in6_addr mcaddr; | |
548 | struct __rt6_probe_work *work = | |
549 | container_of(w, struct __rt6_probe_work, work); | |
550 | ||
551 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
adc176c5 | 552 | ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0); |
c2f17e82 | 553 | dev_put(work->dev); |
662f5533 | 554 | kfree(work); |
c2f17e82 HFS |
555 | } |
556 | ||
27097255 YH |
557 | static void rt6_probe(struct rt6_info *rt) |
558 | { | |
990edb42 | 559 | struct __rt6_probe_work *work; |
f2c31e32 | 560 | struct neighbour *neigh; |
27097255 YH |
561 | /* |
562 | * Okay, this does not seem to be appropriate | |
563 | * for now, however, we need to check if it | |
564 | * is really so; aka Router Reachability Probing. | |
565 | * | |
566 | * Router Reachability Probe MUST be rate-limited | |
567 | * to no more than one per minute. | |
568 | */ | |
2152caea | 569 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 570 | return; |
2152caea YH |
571 | rcu_read_lock_bh(); |
572 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
573 | if (neigh) { | |
8d6c31bf MKL |
574 | if (neigh->nud_state & NUD_VALID) |
575 | goto out; | |
576 | ||
990edb42 | 577 | work = NULL; |
2152caea | 578 | write_lock(&neigh->lock); |
990edb42 MKL |
579 | if (!(neigh->nud_state & NUD_VALID) && |
580 | time_after(jiffies, | |
581 | neigh->updated + | |
582 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
583 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
584 | if (work) | |
585 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 586 | } |
2152caea | 587 | write_unlock(&neigh->lock); |
990edb42 MKL |
588 | } else { |
589 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 590 | } |
990edb42 MKL |
591 | |
592 | if (work) { | |
593 | INIT_WORK(&work->work, rt6_probe_deferred); | |
594 | work->target = rt->rt6i_gateway; | |
595 | dev_hold(rt->dst.dev); | |
596 | work->dev = rt->dst.dev; | |
597 | schedule_work(&work->work); | |
598 | } | |
599 | ||
8d6c31bf | 600 | out: |
2152caea | 601 | rcu_read_unlock_bh(); |
27097255 YH |
602 | } |
603 | #else | |
604 | static inline void rt6_probe(struct rt6_info *rt) | |
605 | { | |
27097255 YH |
606 | } |
607 | #endif | |
608 | ||
1da177e4 | 609 | /* |
554cfb7e | 610 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 611 | */ |
b6f99a21 | 612 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 613 | { |
d1918542 | 614 | struct net_device *dev = rt->dst.dev; |
161980f4 | 615 | if (!oif || dev->ifindex == oif) |
554cfb7e | 616 | return 2; |
161980f4 DM |
617 | if ((dev->flags & IFF_LOOPBACK) && |
618 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
619 | return 1; | |
620 | return 0; | |
554cfb7e | 621 | } |
1da177e4 | 622 | |
afc154e9 | 623 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 624 | { |
f2c31e32 | 625 | struct neighbour *neigh; |
afc154e9 | 626 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 627 | |
4d0c5911 YH |
628 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
629 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 630 | return RT6_NUD_SUCCEED; |
145a3621 YH |
631 | |
632 | rcu_read_lock_bh(); | |
633 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
634 | if (neigh) { | |
635 | read_lock(&neigh->lock); | |
554cfb7e | 636 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 637 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 638 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 639 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 640 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
641 | else |
642 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 643 | #endif |
145a3621 | 644 | read_unlock(&neigh->lock); |
afc154e9 HFS |
645 | } else { |
646 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 647 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 648 | } |
145a3621 YH |
649 | rcu_read_unlock_bh(); |
650 | ||
a5a81f0b | 651 | return ret; |
1da177e4 LT |
652 | } |
653 | ||
554cfb7e YH |
654 | static int rt6_score_route(struct rt6_info *rt, int oif, |
655 | int strict) | |
1da177e4 | 656 | { |
a5a81f0b | 657 | int m; |
1ab1457c | 658 | |
4d0c5911 | 659 | m = rt6_check_dev(rt, oif); |
77d16f45 | 660 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 661 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
662 | #ifdef CONFIG_IPV6_ROUTER_PREF |
663 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
664 | #endif | |
afc154e9 HFS |
665 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
666 | int n = rt6_check_neigh(rt); | |
667 | if (n < 0) | |
668 | return n; | |
669 | } | |
554cfb7e YH |
670 | return m; |
671 | } | |
672 | ||
f11e6659 | 673 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
674 | int *mpri, struct rt6_info *match, |
675 | bool *do_rr) | |
554cfb7e | 676 | { |
f11e6659 | 677 | int m; |
afc154e9 | 678 | bool match_do_rr = false; |
35103d11 AG |
679 | struct inet6_dev *idev = rt->rt6i_idev; |
680 | struct net_device *dev = rt->dst.dev; | |
681 | ||
682 | if (dev && !netif_carrier_ok(dev) && | |
d5d32e4b DA |
683 | idev->cnf.ignore_routes_with_linkdown && |
684 | !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE)) | |
35103d11 | 685 | goto out; |
f11e6659 DM |
686 | |
687 | if (rt6_check_expired(rt)) | |
688 | goto out; | |
689 | ||
690 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 691 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
692 | match_do_rr = true; |
693 | m = 0; /* lowest valid score */ | |
7e980569 | 694 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 695 | goto out; |
afc154e9 HFS |
696 | } |
697 | ||
698 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
699 | rt6_probe(rt); | |
f11e6659 | 700 | |
7e980569 | 701 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 702 | if (m > *mpri) { |
afc154e9 | 703 | *do_rr = match_do_rr; |
f11e6659 DM |
704 | *mpri = m; |
705 | match = rt; | |
f11e6659 | 706 | } |
f11e6659 DM |
707 | out: |
708 | return match; | |
709 | } | |
710 | ||
711 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
712 | struct rt6_info *rr_head, | |
afc154e9 HFS |
713 | u32 metric, int oif, int strict, |
714 | bool *do_rr) | |
f11e6659 | 715 | { |
9fbdcfaf | 716 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 717 | int mpri = -1; |
1da177e4 | 718 | |
f11e6659 | 719 | match = NULL; |
9fbdcfaf SK |
720 | cont = NULL; |
721 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
722 | if (rt->rt6i_metric != metric) { | |
723 | cont = rt; | |
724 | break; | |
725 | } | |
726 | ||
727 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
728 | } | |
729 | ||
730 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
731 | if (rt->rt6i_metric != metric) { | |
732 | cont = rt; | |
733 | break; | |
734 | } | |
735 | ||
afc154e9 | 736 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
737 | } |
738 | ||
739 | if (match || !cont) | |
740 | return match; | |
741 | ||
742 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 743 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 744 | |
f11e6659 DM |
745 | return match; |
746 | } | |
1da177e4 | 747 | |
f11e6659 DM |
748 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
749 | { | |
750 | struct rt6_info *match, *rt0; | |
8ed67789 | 751 | struct net *net; |
afc154e9 | 752 | bool do_rr = false; |
1da177e4 | 753 | |
f11e6659 DM |
754 | rt0 = fn->rr_ptr; |
755 | if (!rt0) | |
756 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 757 | |
afc154e9 HFS |
758 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
759 | &do_rr); | |
1da177e4 | 760 | |
afc154e9 | 761 | if (do_rr) { |
d8d1f30b | 762 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 763 | |
554cfb7e | 764 | /* no entries matched; do round-robin */ |
f11e6659 DM |
765 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
766 | next = fn->leaf; | |
767 | ||
768 | if (next != rt0) | |
769 | fn->rr_ptr = next; | |
1da177e4 | 770 | } |
1da177e4 | 771 | |
d1918542 | 772 | net = dev_net(rt0->dst.dev); |
a02cec21 | 773 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
774 | } |
775 | ||
8b9df265 MKL |
776 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
777 | { | |
778 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
779 | } | |
780 | ||
70ceb4f5 YH |
781 | #ifdef CONFIG_IPV6_ROUTE_INFO |
782 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 783 | const struct in6_addr *gwaddr) |
70ceb4f5 | 784 | { |
c346dca1 | 785 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
786 | struct route_info *rinfo = (struct route_info *) opt; |
787 | struct in6_addr prefix_buf, *prefix; | |
788 | unsigned int pref; | |
4bed72e4 | 789 | unsigned long lifetime; |
70ceb4f5 YH |
790 | struct rt6_info *rt; |
791 | ||
792 | if (len < sizeof(struct route_info)) { | |
793 | return -EINVAL; | |
794 | } | |
795 | ||
796 | /* Sanity check for prefix_len and length */ | |
797 | if (rinfo->length > 3) { | |
798 | return -EINVAL; | |
799 | } else if (rinfo->prefix_len > 128) { | |
800 | return -EINVAL; | |
801 | } else if (rinfo->prefix_len > 64) { | |
802 | if (rinfo->length < 2) { | |
803 | return -EINVAL; | |
804 | } | |
805 | } else if (rinfo->prefix_len > 0) { | |
806 | if (rinfo->length < 1) { | |
807 | return -EINVAL; | |
808 | } | |
809 | } | |
810 | ||
811 | pref = rinfo->route_pref; | |
812 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 813 | return -EINVAL; |
70ceb4f5 | 814 | |
4bed72e4 | 815 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
816 | |
817 | if (rinfo->length == 3) | |
818 | prefix = (struct in6_addr *)rinfo->prefix; | |
819 | else { | |
820 | /* this function is safe */ | |
821 | ipv6_addr_prefix(&prefix_buf, | |
822 | (struct in6_addr *)rinfo->prefix, | |
823 | rinfo->prefix_len); | |
824 | prefix = &prefix_buf; | |
825 | } | |
826 | ||
f104a567 DJ |
827 | if (rinfo->prefix_len == 0) |
828 | rt = rt6_get_dflt_router(gwaddr, dev); | |
829 | else | |
830 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
830218c1 | 831 | gwaddr, dev); |
70ceb4f5 YH |
832 | |
833 | if (rt && !lifetime) { | |
e0a1ad73 | 834 | ip6_del_rt(rt); |
70ceb4f5 YH |
835 | rt = NULL; |
836 | } | |
837 | ||
838 | if (!rt && lifetime) | |
830218c1 DA |
839 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
840 | dev, pref); | |
70ceb4f5 YH |
841 | else if (rt) |
842 | rt->rt6i_flags = RTF_ROUTEINFO | | |
843 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
844 | ||
845 | if (rt) { | |
1716a961 G |
846 | if (!addrconf_finite_timeout(lifetime)) |
847 | rt6_clean_expires(rt); | |
848 | else | |
849 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
850 | ||
94e187c0 | 851 | ip6_rt_put(rt); |
70ceb4f5 YH |
852 | } |
853 | return 0; | |
854 | } | |
855 | #endif | |
856 | ||
a3c00e46 MKL |
857 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
858 | struct in6_addr *saddr) | |
859 | { | |
860 | struct fib6_node *pn; | |
861 | while (1) { | |
862 | if (fn->fn_flags & RTN_TL_ROOT) | |
863 | return NULL; | |
864 | pn = fn->parent; | |
865 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
866 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
867 | else | |
868 | fn = pn; | |
869 | if (fn->fn_flags & RTN_RTINFO) | |
870 | return fn; | |
871 | } | |
872 | } | |
c71099ac | 873 | |
8ed67789 DL |
874 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
875 | struct fib6_table *table, | |
4c9483b2 | 876 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
877 | { |
878 | struct fib6_node *fn; | |
879 | struct rt6_info *rt; | |
880 | ||
c71099ac | 881 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 882 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
883 | restart: |
884 | rt = fn->leaf; | |
4c9483b2 | 885 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 886 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 887 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
888 | if (rt == net->ipv6.ip6_null_entry) { |
889 | fn = fib6_backtrack(fn, &fl6->saddr); | |
890 | if (fn) | |
891 | goto restart; | |
892 | } | |
d8d1f30b | 893 | dst_use(&rt->dst, jiffies); |
c71099ac | 894 | read_unlock_bh(&table->tb6_lock); |
b811580d DA |
895 | |
896 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
897 | ||
c71099ac TG |
898 | return rt; |
899 | ||
900 | } | |
901 | ||
67ba4152 | 902 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
903 | int flags) |
904 | { | |
905 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
908 | ||
9acd9f3a YH |
909 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
910 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 911 | { |
4c9483b2 DM |
912 | struct flowi6 fl6 = { |
913 | .flowi6_oif = oif, | |
914 | .daddr = *daddr, | |
c71099ac TG |
915 | }; |
916 | struct dst_entry *dst; | |
77d16f45 | 917 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 918 | |
adaa70bb | 919 | if (saddr) { |
4c9483b2 | 920 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
921 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
922 | } | |
923 | ||
4c9483b2 | 924 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
925 | if (dst->error == 0) |
926 | return (struct rt6_info *) dst; | |
927 | ||
928 | dst_release(dst); | |
929 | ||
1da177e4 LT |
930 | return NULL; |
931 | } | |
7159039a YH |
932 | EXPORT_SYMBOL(rt6_lookup); |
933 | ||
c71099ac | 934 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
935 | It takes new route entry, the addition fails by any reason the |
936 | route is freed. In any case, if caller does not hold it, it may | |
937 | be destroyed. | |
938 | */ | |
939 | ||
e5fd387a | 940 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 941 | struct mx6_config *mxc) |
1da177e4 LT |
942 | { |
943 | int err; | |
c71099ac | 944 | struct fib6_table *table; |
1da177e4 | 945 | |
c71099ac TG |
946 | table = rt->rt6i_table; |
947 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 948 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 949 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
950 | |
951 | return err; | |
952 | } | |
953 | ||
40e22e8f TG |
954 | int ip6_ins_rt(struct rt6_info *rt) |
955 | { | |
e715b6d3 FW |
956 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
957 | struct mx6_config mxc = { .mx = NULL, }; | |
958 | ||
959 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
960 | } |
961 | ||
8b9df265 MKL |
962 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
963 | const struct in6_addr *daddr, | |
964 | const struct in6_addr *saddr) | |
1da177e4 | 965 | { |
1da177e4 LT |
966 | struct rt6_info *rt; |
967 | ||
968 | /* | |
969 | * Clone the route. | |
970 | */ | |
971 | ||
d52d3997 | 972 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 973 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 974 | |
ad706862 | 975 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0); |
83a09abd MKL |
976 | |
977 | if (!rt) | |
978 | return NULL; | |
979 | ||
980 | ip6_rt_copy_init(rt, ort); | |
981 | rt->rt6i_flags |= RTF_CACHE; | |
982 | rt->rt6i_metric = 0; | |
983 | rt->dst.flags |= DST_HOST; | |
984 | rt->rt6i_dst.addr = *daddr; | |
985 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 986 | |
83a09abd MKL |
987 | if (!rt6_is_gw_or_nonexthop(ort)) { |
988 | if (ort->rt6i_dst.plen != 128 && | |
989 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
990 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 991 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
992 | if (rt->rt6i_src.plen && saddr) { |
993 | rt->rt6i_src.addr = *saddr; | |
994 | rt->rt6i_src.plen = 128; | |
8b9df265 | 995 | } |
83a09abd | 996 | #endif |
95a9a5ba | 997 | } |
1da177e4 | 998 | |
95a9a5ba YH |
999 | return rt; |
1000 | } | |
1da177e4 | 1001 | |
d52d3997 MKL |
1002 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
1003 | { | |
1004 | struct rt6_info *pcpu_rt; | |
1005 | ||
1006 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
ad706862 | 1007 | rt->dst.dev, rt->dst.flags); |
d52d3997 MKL |
1008 | |
1009 | if (!pcpu_rt) | |
1010 | return NULL; | |
1011 | ip6_rt_copy_init(pcpu_rt, rt); | |
1012 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
1013 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
1014 | return pcpu_rt; | |
1015 | } | |
1016 | ||
1017 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
1018 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
1019 | { | |
a73e4195 | 1020 | struct rt6_info *pcpu_rt, **p; |
d52d3997 MKL |
1021 | |
1022 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1023 | pcpu_rt = *p; | |
1024 | ||
a73e4195 MKL |
1025 | if (pcpu_rt) { |
1026 | dst_hold(&pcpu_rt->dst); | |
1027 | rt6_dst_from_metrics_check(pcpu_rt); | |
1028 | } | |
1029 | return pcpu_rt; | |
1030 | } | |
1031 | ||
1032 | static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt) | |
1033 | { | |
9c7370a1 | 1034 | struct fib6_table *table = rt->rt6i_table; |
a73e4195 | 1035 | struct rt6_info *pcpu_rt, *prev, **p; |
d52d3997 MKL |
1036 | |
1037 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1038 | if (!pcpu_rt) { | |
1039 | struct net *net = dev_net(rt->dst.dev); | |
1040 | ||
9c7370a1 MKL |
1041 | dst_hold(&net->ipv6.ip6_null_entry->dst); |
1042 | return net->ipv6.ip6_null_entry; | |
d52d3997 MKL |
1043 | } |
1044 | ||
9c7370a1 MKL |
1045 | read_lock_bh(&table->tb6_lock); |
1046 | if (rt->rt6i_pcpu) { | |
1047 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1048 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1049 | if (prev) { | |
1050 | /* If someone did it before us, return prev instead */ | |
1051 | dst_destroy(&pcpu_rt->dst); | |
1052 | pcpu_rt = prev; | |
1053 | } | |
1054 | } else { | |
1055 | /* rt has been removed from the fib6 tree | |
1056 | * before we have a chance to acquire the read_lock. | |
1057 | * In this case, don't brother to create a pcpu rt | |
1058 | * since rt is going away anyway. The next | |
1059 | * dst_check() will trigger a re-lookup. | |
1060 | */ | |
d52d3997 | 1061 | dst_destroy(&pcpu_rt->dst); |
9c7370a1 | 1062 | pcpu_rt = rt; |
d52d3997 | 1063 | } |
d52d3997 MKL |
1064 | dst_hold(&pcpu_rt->dst); |
1065 | rt6_dst_from_metrics_check(pcpu_rt); | |
9c7370a1 | 1066 | read_unlock_bh(&table->tb6_lock); |
d52d3997 MKL |
1067 | return pcpu_rt; |
1068 | } | |
1069 | ||
9ff74384 DA |
1070 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
1071 | int oif, struct flowi6 *fl6, int flags) | |
1da177e4 | 1072 | { |
367efcb9 | 1073 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1074 | struct rt6_info *rt; |
c71099ac | 1075 | int strict = 0; |
1da177e4 | 1076 | |
77d16f45 | 1077 | strict |= flags & RT6_LOOKUP_F_IFACE; |
d5d32e4b | 1078 | strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE; |
367efcb9 MKL |
1079 | if (net->ipv6.devconf_all->forwarding == 0) |
1080 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1081 | |
c71099ac | 1082 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1083 | |
4c9483b2 | 1084 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1085 | saved_fn = fn; |
1da177e4 | 1086 | |
ca254490 DA |
1087 | if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF) |
1088 | oif = 0; | |
1089 | ||
a3c00e46 | 1090 | redo_rt6_select: |
367efcb9 | 1091 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1092 | if (rt->rt6i_nsiblings) |
367efcb9 | 1093 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1094 | if (rt == net->ipv6.ip6_null_entry) { |
1095 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1096 | if (fn) | |
1097 | goto redo_rt6_select; | |
367efcb9 MKL |
1098 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1099 | /* also consider unreachable route */ | |
1100 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1101 | fn = saved_fn; | |
1102 | goto redo_rt6_select; | |
367efcb9 | 1103 | } |
a3c00e46 MKL |
1104 | } |
1105 | ||
fb9de91e | 1106 | |
3da59bd9 | 1107 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1108 | dst_use(&rt->dst, jiffies); |
1109 | read_unlock_bh(&table->tb6_lock); | |
1110 | ||
1111 | rt6_dst_from_metrics_check(rt); | |
b811580d DA |
1112 | |
1113 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); | |
d52d3997 | 1114 | return rt; |
3da59bd9 MKL |
1115 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1116 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1117 | /* Create a RTF_CACHE clone which will not be | |
1118 | * owned by the fib6 tree. It is for the special case where | |
1119 | * the daddr in the skb during the neighbor look-up is different | |
1120 | * from the fl6->daddr used to look-up route here. | |
1121 | */ | |
1122 | ||
1123 | struct rt6_info *uncached_rt; | |
1124 | ||
d52d3997 MKL |
1125 | dst_use(&rt->dst, jiffies); |
1126 | read_unlock_bh(&table->tb6_lock); | |
1127 | ||
3da59bd9 MKL |
1128 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1129 | dst_release(&rt->dst); | |
c71099ac | 1130 | |
3da59bd9 | 1131 | if (uncached_rt) |
8d0b94af | 1132 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1133 | else |
1134 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1135 | |
3da59bd9 | 1136 | dst_hold(&uncached_rt->dst); |
b811580d DA |
1137 | |
1138 | trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6); | |
3da59bd9 | 1139 | return uncached_rt; |
3da59bd9 | 1140 | |
d52d3997 MKL |
1141 | } else { |
1142 | /* Get a percpu copy */ | |
1143 | ||
1144 | struct rt6_info *pcpu_rt; | |
1145 | ||
1146 | rt->dst.lastuse = jiffies; | |
1147 | rt->dst.__use++; | |
1148 | pcpu_rt = rt6_get_pcpu_route(rt); | |
d52d3997 | 1149 | |
9c7370a1 MKL |
1150 | if (pcpu_rt) { |
1151 | read_unlock_bh(&table->tb6_lock); | |
1152 | } else { | |
1153 | /* We have to do the read_unlock first | |
1154 | * because rt6_make_pcpu_route() may trigger | |
1155 | * ip6_dst_gc() which will take the write_lock. | |
1156 | */ | |
1157 | dst_hold(&rt->dst); | |
1158 | read_unlock_bh(&table->tb6_lock); | |
a73e4195 | 1159 | pcpu_rt = rt6_make_pcpu_route(rt); |
9c7370a1 MKL |
1160 | dst_release(&rt->dst); |
1161 | } | |
d52d3997 | 1162 | |
b811580d | 1163 | trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6); |
d52d3997 | 1164 | return pcpu_rt; |
9c7370a1 | 1165 | |
d52d3997 | 1166 | } |
1da177e4 | 1167 | } |
9ff74384 | 1168 | EXPORT_SYMBOL_GPL(ip6_pol_route); |
1da177e4 | 1169 | |
8ed67789 | 1170 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1171 | struct flowi6 *fl6, int flags) |
4acad72d | 1172 | { |
4c9483b2 | 1173 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1174 | } |
1175 | ||
d409b847 MB |
1176 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
1177 | struct net_device *dev, | |
1178 | struct flowi6 *fl6, int flags) | |
72331bc0 SL |
1179 | { |
1180 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1181 | flags |= RT6_LOOKUP_F_IFACE; | |
1182 | ||
1183 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1184 | } | |
d409b847 | 1185 | EXPORT_SYMBOL_GPL(ip6_route_input_lookup); |
72331bc0 | 1186 | |
c71099ac TG |
1187 | void ip6_route_input(struct sk_buff *skb) |
1188 | { | |
b71d1d42 | 1189 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1190 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1191 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
904af04d | 1192 | struct ip_tunnel_info *tun_info; |
4c9483b2 | 1193 | struct flowi6 fl6 = { |
e0d56fdd | 1194 | .flowi6_iif = skb->dev->ifindex, |
4c9483b2 DM |
1195 | .daddr = iph->daddr, |
1196 | .saddr = iph->saddr, | |
6502ca52 | 1197 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1198 | .flowi6_mark = skb->mark, |
1199 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1200 | }; |
adaa70bb | 1201 | |
904af04d | 1202 | tun_info = skb_tunnel_info(skb); |
46fa062a | 1203 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
904af04d | 1204 | fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id; |
06e9d040 | 1205 | skb_dst_drop(skb); |
72331bc0 | 1206 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1207 | } |
1208 | ||
8ed67789 | 1209 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1210 | struct flowi6 *fl6, int flags) |
1da177e4 | 1211 | { |
4c9483b2 | 1212 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1213 | } |
1214 | ||
6f21c96a PA |
1215 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
1216 | struct flowi6 *fl6, int flags) | |
c71099ac | 1217 | { |
d46a9d67 | 1218 | bool any_src; |
c71099ac | 1219 | |
4c1feac5 DA |
1220 | if (rt6_need_strict(&fl6->daddr)) { |
1221 | struct dst_entry *dst; | |
1222 | ||
1223 | dst = l3mdev_link_scope_lookup(net, fl6); | |
1224 | if (dst) | |
1225 | return dst; | |
1226 | } | |
ca254490 | 1227 | |
1fb9489b | 1228 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1229 | |
d46a9d67 | 1230 | any_src = ipv6_addr_any(&fl6->saddr); |
741a11d9 | 1231 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) || |
d46a9d67 | 1232 | (fl6->flowi6_oif && any_src)) |
77d16f45 | 1233 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1234 | |
d46a9d67 | 1235 | if (!any_src) |
adaa70bb | 1236 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1237 | else if (sk) |
1238 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1239 | |
4c9483b2 | 1240 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1241 | } |
6f21c96a | 1242 | EXPORT_SYMBOL_GPL(ip6_route_output_flags); |
1da177e4 | 1243 | |
2774c131 | 1244 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1245 | { |
5c1e6aa3 | 1246 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1247 | struct dst_entry *new = NULL; |
1248 | ||
f5b0a874 | 1249 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1250 | if (rt) { |
0a1f5962 | 1251 | rt6_info_init(rt); |
8104891b | 1252 | |
0a1f5962 | 1253 | new = &rt->dst; |
14e50e57 | 1254 | new->__use = 1; |
352e512c | 1255 | new->input = dst_discard; |
ede2059d | 1256 | new->output = dst_discard_out; |
14e50e57 | 1257 | |
0a1f5962 | 1258 | dst_copy_metrics(new, &ort->dst); |
14e50e57 DM |
1259 | rt->rt6i_idev = ort->rt6i_idev; |
1260 | if (rt->rt6i_idev) | |
1261 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1262 | |
4e3fd7a0 | 1263 | rt->rt6i_gateway = ort->rt6i_gateway; |
0a1f5962 | 1264 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU; |
14e50e57 DM |
1265 | rt->rt6i_metric = 0; |
1266 | ||
1267 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1268 | #ifdef CONFIG_IPV6_SUBTREES | |
1269 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1270 | #endif | |
1271 | ||
1272 | dst_free(new); | |
1273 | } | |
1274 | ||
69ead7af DM |
1275 | dst_release(dst_orig); |
1276 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1277 | } |
14e50e57 | 1278 | |
1da177e4 LT |
1279 | /* |
1280 | * Destination cache support functions | |
1281 | */ | |
1282 | ||
4b32b5ad MKL |
1283 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1284 | { | |
1285 | if (rt->dst.from && | |
1286 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1287 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1288 | } | |
1289 | ||
3da59bd9 MKL |
1290 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1291 | { | |
1292 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1293 | return NULL; | |
1294 | ||
1295 | if (rt6_check_expired(rt)) | |
1296 | return NULL; | |
1297 | ||
1298 | return &rt->dst; | |
1299 | } | |
1300 | ||
1301 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1302 | { | |
5973fb1e MKL |
1303 | if (!__rt6_check_expired(rt) && |
1304 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
3da59bd9 MKL |
1305 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) |
1306 | return &rt->dst; | |
1307 | else | |
1308 | return NULL; | |
1309 | } | |
1310 | ||
1da177e4 LT |
1311 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1312 | { | |
1313 | struct rt6_info *rt; | |
1314 | ||
1315 | rt = (struct rt6_info *) dst; | |
1316 | ||
6f3118b5 ND |
1317 | /* All IPV6 dsts are created with ->obsolete set to the value |
1318 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1319 | * into this function always. | |
1320 | */ | |
e3bc10bd | 1321 | |
4b32b5ad MKL |
1322 | rt6_dst_from_metrics_check(rt); |
1323 | ||
02bcf4e0 MKL |
1324 | if (rt->rt6i_flags & RTF_PCPU || |
1325 | (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from)) | |
3da59bd9 MKL |
1326 | return rt6_dst_from_check(rt, cookie); |
1327 | else | |
1328 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1329 | } |
1330 | ||
1331 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1332 | { | |
1333 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1334 | ||
1335 | if (rt) { | |
54c1a859 YH |
1336 | if (rt->rt6i_flags & RTF_CACHE) { |
1337 | if (rt6_check_expired(rt)) { | |
1338 | ip6_del_rt(rt); | |
1339 | dst = NULL; | |
1340 | } | |
1341 | } else { | |
1da177e4 | 1342 | dst_release(dst); |
54c1a859 YH |
1343 | dst = NULL; |
1344 | } | |
1da177e4 | 1345 | } |
54c1a859 | 1346 | return dst; |
1da177e4 LT |
1347 | } |
1348 | ||
1349 | static void ip6_link_failure(struct sk_buff *skb) | |
1350 | { | |
1351 | struct rt6_info *rt; | |
1352 | ||
3ffe533c | 1353 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1354 | |
adf30907 | 1355 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1356 | if (rt) { |
1eb4f758 HFS |
1357 | if (rt->rt6i_flags & RTF_CACHE) { |
1358 | dst_hold(&rt->dst); | |
8e3d5be7 | 1359 | ip6_del_rt(rt); |
1eb4f758 | 1360 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { |
1da177e4 | 1361 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1362 | } |
1da177e4 LT |
1363 | } |
1364 | } | |
1365 | ||
45e4fd26 MKL |
1366 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1367 | { | |
1368 | struct net *net = dev_net(rt->dst.dev); | |
1369 | ||
1370 | rt->rt6i_flags |= RTF_MODIFIED; | |
1371 | rt->rt6i_pmtu = mtu; | |
1372 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1373 | } | |
1374 | ||
0d3f6d29 MKL |
1375 | static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt) |
1376 | { | |
1377 | return !(rt->rt6i_flags & RTF_CACHE) && | |
1378 | (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node); | |
1379 | } | |
1380 | ||
45e4fd26 MKL |
1381 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, |
1382 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1383 | { |
0dec879f | 1384 | const struct in6_addr *daddr, *saddr; |
67ba4152 | 1385 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1386 | |
45e4fd26 MKL |
1387 | if (rt6->rt6i_flags & RTF_LOCAL) |
1388 | return; | |
81aded24 | 1389 | |
19bda36c XL |
1390 | if (dst_metric_locked(dst, RTAX_MTU)) |
1391 | return; | |
1392 | ||
0dec879f JA |
1393 | if (iph) { |
1394 | daddr = &iph->daddr; | |
1395 | saddr = &iph->saddr; | |
1396 | } else if (sk) { | |
1397 | daddr = &sk->sk_v6_daddr; | |
1398 | saddr = &inet6_sk(sk)->saddr; | |
1399 | } else { | |
1400 | daddr = NULL; | |
1401 | saddr = NULL; | |
1402 | } | |
1403 | dst_confirm_neigh(dst, daddr); | |
45e4fd26 MKL |
1404 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); |
1405 | if (mtu >= dst_mtu(dst)) | |
1406 | return; | |
9d289715 | 1407 | |
0d3f6d29 | 1408 | if (!rt6_cache_allowed_for_pmtu(rt6)) { |
45e4fd26 | 1409 | rt6_do_update_pmtu(rt6, mtu); |
0dec879f | 1410 | } else if (daddr) { |
45e4fd26 MKL |
1411 | struct rt6_info *nrt6; |
1412 | ||
45e4fd26 MKL |
1413 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); |
1414 | if (nrt6) { | |
1415 | rt6_do_update_pmtu(nrt6, mtu); | |
1416 | ||
1417 | /* ip6_ins_rt(nrt6) will bump the | |
1418 | * rt6->rt6i_node->fn_sernum | |
1419 | * which will fail the next rt6_check() and | |
1420 | * invalidate the sk->sk_dst_cache. | |
1421 | */ | |
1422 | ip6_ins_rt(nrt6); | |
1423 | } | |
1da177e4 LT |
1424 | } |
1425 | } | |
1426 | ||
45e4fd26 MKL |
1427 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1428 | struct sk_buff *skb, u32 mtu) | |
1429 | { | |
1430 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1431 | } | |
1432 | ||
42ae66c8 | 1433 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
e2d118a1 | 1434 | int oif, u32 mark, kuid_t uid) |
81aded24 DM |
1435 | { |
1436 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1437 | struct dst_entry *dst; | |
1438 | struct flowi6 fl6; | |
1439 | ||
1440 | memset(&fl6, 0, sizeof(fl6)); | |
1441 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1442 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1443 | fl6.daddr = iph->daddr; |
1444 | fl6.saddr = iph->saddr; | |
6502ca52 | 1445 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 1446 | fl6.flowi6_uid = uid; |
81aded24 DM |
1447 | |
1448 | dst = ip6_route_output(net, NULL, &fl6); | |
1449 | if (!dst->error) | |
45e4fd26 | 1450 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1451 | dst_release(dst); |
1452 | } | |
1453 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1454 | ||
1455 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1456 | { | |
33c162a9 MKL |
1457 | struct dst_entry *dst; |
1458 | ||
81aded24 | 1459 | ip6_update_pmtu(skb, sock_net(sk), mtu, |
e2d118a1 | 1460 | sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid); |
33c162a9 MKL |
1461 | |
1462 | dst = __sk_dst_get(sk); | |
1463 | if (!dst || !dst->obsolete || | |
1464 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) | |
1465 | return; | |
1466 | ||
1467 | bh_lock_sock(sk); | |
1468 | if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
1469 | ip6_datagram_dst_update(sk, false); | |
1470 | bh_unlock_sock(sk); | |
81aded24 DM |
1471 | } |
1472 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1473 | ||
b55b76b2 DJ |
1474 | /* Handle redirects */ |
1475 | struct ip6rd_flowi { | |
1476 | struct flowi6 fl6; | |
1477 | struct in6_addr gateway; | |
1478 | }; | |
1479 | ||
1480 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1481 | struct fib6_table *table, | |
1482 | struct flowi6 *fl6, | |
1483 | int flags) | |
1484 | { | |
1485 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1486 | struct rt6_info *rt; | |
1487 | struct fib6_node *fn; | |
1488 | ||
1489 | /* Get the "current" route for this destination and | |
67c408cf | 1490 | * check if the redirect has come from appropriate router. |
b55b76b2 DJ |
1491 | * |
1492 | * RFC 4861 specifies that redirects should only be | |
1493 | * accepted if they come from the nexthop to the target. | |
1494 | * Due to the way the routes are chosen, this notion | |
1495 | * is a bit fuzzy and one might need to check all possible | |
1496 | * routes. | |
1497 | */ | |
1498 | ||
1499 | read_lock_bh(&table->tb6_lock); | |
1500 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1501 | restart: | |
1502 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1503 | if (rt6_check_expired(rt)) | |
1504 | continue; | |
1505 | if (rt->dst.error) | |
1506 | break; | |
1507 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1508 | continue; | |
1509 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1510 | continue; | |
1511 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1512 | continue; | |
1513 | break; | |
1514 | } | |
1515 | ||
1516 | if (!rt) | |
1517 | rt = net->ipv6.ip6_null_entry; | |
1518 | else if (rt->dst.error) { | |
1519 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1520 | goto out; |
1521 | } | |
1522 | ||
1523 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1524 | fn = fib6_backtrack(fn, &fl6->saddr); |
1525 | if (fn) | |
1526 | goto restart; | |
b55b76b2 | 1527 | } |
a3c00e46 | 1528 | |
b0a1ba59 | 1529 | out: |
b55b76b2 DJ |
1530 | dst_hold(&rt->dst); |
1531 | ||
1532 | read_unlock_bh(&table->tb6_lock); | |
1533 | ||
b811580d | 1534 | trace_fib6_table_lookup(net, rt, table->tb6_id, fl6); |
b55b76b2 DJ |
1535 | return rt; |
1536 | }; | |
1537 | ||
1538 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1539 | const struct flowi6 *fl6, | |
1540 | const struct in6_addr *gateway) | |
1541 | { | |
1542 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1543 | struct ip6rd_flowi rdfl; | |
1544 | ||
1545 | rdfl.fl6 = *fl6; | |
1546 | rdfl.gateway = *gateway; | |
1547 | ||
1548 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1549 | flags, __ip6_route_redirect); | |
1550 | } | |
1551 | ||
e2d118a1 LC |
1552 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
1553 | kuid_t uid) | |
3a5ad2ee DM |
1554 | { |
1555 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1556 | struct dst_entry *dst; | |
1557 | struct flowi6 fl6; | |
1558 | ||
1559 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1560 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1561 | fl6.flowi6_oif = oif; |
1562 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1563 | fl6.daddr = iph->daddr; |
1564 | fl6.saddr = iph->saddr; | |
6502ca52 | 1565 | fl6.flowlabel = ip6_flowinfo(iph); |
e2d118a1 | 1566 | fl6.flowi6_uid = uid; |
3a5ad2ee | 1567 | |
b55b76b2 DJ |
1568 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1569 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1570 | dst_release(dst); |
1571 | } | |
1572 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1573 | ||
c92a59ec DJ |
1574 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1575 | u32 mark) | |
1576 | { | |
1577 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1578 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1579 | struct dst_entry *dst; | |
1580 | struct flowi6 fl6; | |
1581 | ||
1582 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1583 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1584 | fl6.flowi6_oif = oif; |
1585 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1586 | fl6.daddr = msg->dest; |
1587 | fl6.saddr = iph->daddr; | |
e2d118a1 | 1588 | fl6.flowi6_uid = sock_net_uid(net, NULL); |
c92a59ec | 1589 | |
b55b76b2 DJ |
1590 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1591 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1592 | dst_release(dst); |
1593 | } | |
1594 | ||
3a5ad2ee DM |
1595 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1596 | { | |
e2d118a1 LC |
1597 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark, |
1598 | sk->sk_uid); | |
3a5ad2ee DM |
1599 | } |
1600 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1601 | ||
0dbaee3b | 1602 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1603 | { |
0dbaee3b DM |
1604 | struct net_device *dev = dst->dev; |
1605 | unsigned int mtu = dst_mtu(dst); | |
1606 | struct net *net = dev_net(dev); | |
1607 | ||
1da177e4 LT |
1608 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1609 | ||
5578689a DL |
1610 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1611 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1612 | |
1613 | /* | |
1ab1457c YH |
1614 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1615 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1616 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1617 | * rely only on pmtu discovery" |
1618 | */ | |
1619 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1620 | mtu = IPV6_MAXPLEN; | |
1621 | return mtu; | |
1622 | } | |
1623 | ||
ebb762f2 | 1624 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1625 | { |
4b32b5ad MKL |
1626 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1627 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1628 | struct inet6_dev *idev; |
618f9bc7 | 1629 | |
4b32b5ad MKL |
1630 | if (mtu) |
1631 | goto out; | |
1632 | ||
1633 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1634 | if (mtu) |
30f78d8e | 1635 | goto out; |
618f9bc7 SK |
1636 | |
1637 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1638 | |
1639 | rcu_read_lock(); | |
1640 | idev = __in6_dev_get(dst->dev); | |
1641 | if (idev) | |
1642 | mtu = idev->cnf.mtu6; | |
1643 | rcu_read_unlock(); | |
1644 | ||
30f78d8e | 1645 | out: |
14972cbd RP |
1646 | mtu = min_t(unsigned int, mtu, IP6_MAX_MTU); |
1647 | ||
1648 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
d33e4553 DM |
1649 | } |
1650 | ||
3b00944c YH |
1651 | static struct dst_entry *icmp6_dst_gc_list; |
1652 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1653 | |
3b00944c | 1654 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1655 | struct flowi6 *fl6) |
1da177e4 | 1656 | { |
87a11578 | 1657 | struct dst_entry *dst; |
1da177e4 LT |
1658 | struct rt6_info *rt; |
1659 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1660 | struct net *net = dev_net(dev); |
1da177e4 | 1661 | |
38308473 | 1662 | if (unlikely(!idev)) |
122bdf67 | 1663 | return ERR_PTR(-ENODEV); |
1da177e4 | 1664 | |
ad706862 | 1665 | rt = ip6_dst_alloc(net, dev, 0); |
38308473 | 1666 | if (unlikely(!rt)) { |
1da177e4 | 1667 | in6_dev_put(idev); |
87a11578 | 1668 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1669 | goto out; |
1670 | } | |
1671 | ||
8e2ec639 YZ |
1672 | rt->dst.flags |= DST_HOST; |
1673 | rt->dst.output = ip6_output; | |
d8d1f30b | 1674 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1675 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1676 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1677 | rt->rt6i_dst.plen = 128; |
1678 | rt->rt6i_idev = idev; | |
14edd87d | 1679 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1680 | |
3b00944c | 1681 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1682 | rt->dst.next = icmp6_dst_gc_list; |
1683 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1684 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1685 | |
5578689a | 1686 | fib6_force_start_gc(net); |
1da177e4 | 1687 | |
87a11578 DM |
1688 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1689 | ||
1da177e4 | 1690 | out: |
87a11578 | 1691 | return dst; |
1da177e4 LT |
1692 | } |
1693 | ||
3d0f24a7 | 1694 | int icmp6_dst_gc(void) |
1da177e4 | 1695 | { |
e9476e95 | 1696 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1697 | int more = 0; |
1da177e4 | 1698 | |
3b00944c YH |
1699 | spin_lock_bh(&icmp6_dst_lock); |
1700 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1701 | |
1da177e4 LT |
1702 | while ((dst = *pprev) != NULL) { |
1703 | if (!atomic_read(&dst->__refcnt)) { | |
1704 | *pprev = dst->next; | |
1705 | dst_free(dst); | |
1da177e4 LT |
1706 | } else { |
1707 | pprev = &dst->next; | |
3d0f24a7 | 1708 | ++more; |
1da177e4 LT |
1709 | } |
1710 | } | |
1711 | ||
3b00944c | 1712 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1713 | |
3d0f24a7 | 1714 | return more; |
1da177e4 LT |
1715 | } |
1716 | ||
1e493d19 DM |
1717 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1718 | void *arg) | |
1719 | { | |
1720 | struct dst_entry *dst, **pprev; | |
1721 | ||
1722 | spin_lock_bh(&icmp6_dst_lock); | |
1723 | pprev = &icmp6_dst_gc_list; | |
1724 | while ((dst = *pprev) != NULL) { | |
1725 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1726 | if (func(rt, arg)) { | |
1727 | *pprev = dst->next; | |
1728 | dst_free(dst); | |
1729 | } else { | |
1730 | pprev = &dst->next; | |
1731 | } | |
1732 | } | |
1733 | spin_unlock_bh(&icmp6_dst_lock); | |
1734 | } | |
1735 | ||
569d3645 | 1736 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1737 | { |
86393e52 | 1738 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1739 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1740 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1741 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1742 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1743 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1744 | int entries; |
7019b78e | 1745 | |
fc66f95c | 1746 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1747 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1748 | entries <= rt_max_size) |
1da177e4 LT |
1749 | goto out; |
1750 | ||
6891a346 | 1751 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1752 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1753 | entries = dst_entries_get_slow(ops); |
1754 | if (entries < ops->gc_thresh) | |
7019b78e | 1755 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1756 | out: |
7019b78e | 1757 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1758 | return entries > rt_max_size; |
1da177e4 LT |
1759 | } |
1760 | ||
e715b6d3 FW |
1761 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1762 | const struct fib6_config *cfg) | |
1763 | { | |
c3a8d947 | 1764 | bool ecn_ca = false; |
e715b6d3 FW |
1765 | struct nlattr *nla; |
1766 | int remaining; | |
1767 | u32 *mp; | |
1768 | ||
63159f29 | 1769 | if (!cfg->fc_mx) |
e715b6d3 FW |
1770 | return 0; |
1771 | ||
1772 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1773 | if (unlikely(!mp)) | |
1774 | return -ENOMEM; | |
1775 | ||
1776 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1777 | int type = nla_type(nla); | |
1bb14807 | 1778 | u32 val; |
e715b6d3 | 1779 | |
1bb14807 DB |
1780 | if (!type) |
1781 | continue; | |
1782 | if (unlikely(type > RTAX_MAX)) | |
1783 | goto err; | |
ea697639 | 1784 | |
1bb14807 DB |
1785 | if (type == RTAX_CC_ALGO) { |
1786 | char tmp[TCP_CA_NAME_MAX]; | |
e715b6d3 | 1787 | |
1bb14807 | 1788 | nla_strlcpy(tmp, nla, sizeof(tmp)); |
c3a8d947 | 1789 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
1bb14807 DB |
1790 | if (val == TCP_CA_UNSPEC) |
1791 | goto err; | |
1792 | } else { | |
1793 | val = nla_get_u32(nla); | |
e715b6d3 | 1794 | } |
626abd59 PA |
1795 | if (type == RTAX_HOPLIMIT && val > 255) |
1796 | val = 255; | |
b8d3e416 DB |
1797 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) |
1798 | goto err; | |
1bb14807 DB |
1799 | |
1800 | mp[type - 1] = val; | |
1801 | __set_bit(type - 1, mxc->mx_valid); | |
e715b6d3 FW |
1802 | } |
1803 | ||
c3a8d947 DB |
1804 | if (ecn_ca) { |
1805 | __set_bit(RTAX_FEATURES - 1, mxc->mx_valid); | |
1806 | mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
1807 | } | |
e715b6d3 | 1808 | |
c3a8d947 | 1809 | mxc->mx = mp; |
e715b6d3 FW |
1810 | return 0; |
1811 | err: | |
1812 | kfree(mp); | |
1813 | return -EINVAL; | |
1814 | } | |
1da177e4 | 1815 | |
8c14586f DA |
1816 | static struct rt6_info *ip6_nh_lookup_table(struct net *net, |
1817 | struct fib6_config *cfg, | |
1818 | const struct in6_addr *gw_addr) | |
1819 | { | |
1820 | struct flowi6 fl6 = { | |
1821 | .flowi6_oif = cfg->fc_ifindex, | |
1822 | .daddr = *gw_addr, | |
1823 | .saddr = cfg->fc_prefsrc, | |
1824 | }; | |
1825 | struct fib6_table *table; | |
1826 | struct rt6_info *rt; | |
d5d32e4b | 1827 | int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE; |
8c14586f DA |
1828 | |
1829 | table = fib6_get_table(net, cfg->fc_table); | |
1830 | if (!table) | |
1831 | return NULL; | |
1832 | ||
1833 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) | |
1834 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
1835 | ||
1836 | rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags); | |
1837 | ||
1838 | /* if table lookup failed, fall back to full lookup */ | |
1839 | if (rt == net->ipv6.ip6_null_entry) { | |
1840 | ip6_rt_put(rt); | |
1841 | rt = NULL; | |
1842 | } | |
1843 | ||
1844 | return rt; | |
1845 | } | |
1846 | ||
8c5b83f0 | 1847 | static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg) |
1da177e4 | 1848 | { |
5578689a | 1849 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1850 | struct rt6_info *rt = NULL; |
1851 | struct net_device *dev = NULL; | |
1852 | struct inet6_dev *idev = NULL; | |
c71099ac | 1853 | struct fib6_table *table; |
1da177e4 | 1854 | int addr_type; |
8c5b83f0 | 1855 | int err = -EINVAL; |
1da177e4 | 1856 | |
557c44be DA |
1857 | /* RTF_PCPU is an internal flag; can not be set by userspace */ |
1858 | if (cfg->fc_flags & RTF_PCPU) | |
1859 | goto out; | |
1860 | ||
86872cb5 | 1861 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
8c5b83f0 | 1862 | goto out; |
1da177e4 | 1863 | #ifndef CONFIG_IPV6_SUBTREES |
86872cb5 | 1864 | if (cfg->fc_src_len) |
8c5b83f0 | 1865 | goto out; |
1da177e4 | 1866 | #endif |
86872cb5 | 1867 | if (cfg->fc_ifindex) { |
1da177e4 | 1868 | err = -ENODEV; |
5578689a | 1869 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1870 | if (!dev) |
1871 | goto out; | |
1872 | idev = in6_dev_get(dev); | |
1873 | if (!idev) | |
1874 | goto out; | |
1875 | } | |
1876 | ||
86872cb5 TG |
1877 | if (cfg->fc_metric == 0) |
1878 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1879 | |
d71314b4 | 1880 | err = -ENOBUFS; |
38308473 DM |
1881 | if (cfg->fc_nlinfo.nlh && |
1882 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1883 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1884 | if (!table) { |
f3213831 | 1885 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1886 | table = fib6_new_table(net, cfg->fc_table); |
1887 | } | |
1888 | } else { | |
1889 | table = fib6_new_table(net, cfg->fc_table); | |
1890 | } | |
38308473 DM |
1891 | |
1892 | if (!table) | |
c71099ac | 1893 | goto out; |
c71099ac | 1894 | |
ad706862 MKL |
1895 | rt = ip6_dst_alloc(net, NULL, |
1896 | (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT); | |
1da177e4 | 1897 | |
38308473 | 1898 | if (!rt) { |
1da177e4 LT |
1899 | err = -ENOMEM; |
1900 | goto out; | |
1901 | } | |
1902 | ||
1716a961 G |
1903 | if (cfg->fc_flags & RTF_EXPIRES) |
1904 | rt6_set_expires(rt, jiffies + | |
1905 | clock_t_to_jiffies(cfg->fc_expires)); | |
1906 | else | |
1907 | rt6_clean_expires(rt); | |
1da177e4 | 1908 | |
86872cb5 TG |
1909 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1910 | cfg->fc_protocol = RTPROT_BOOT; | |
1911 | rt->rt6i_protocol = cfg->fc_protocol; | |
1912 | ||
1913 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1914 | |
1915 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1916 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1917 | else if (cfg->fc_flags & RTF_LOCAL) |
1918 | rt->dst.input = ip6_input; | |
1da177e4 | 1919 | else |
d8d1f30b | 1920 | rt->dst.input = ip6_forward; |
1da177e4 | 1921 | |
d8d1f30b | 1922 | rt->dst.output = ip6_output; |
1da177e4 | 1923 | |
19e42e45 RP |
1924 | if (cfg->fc_encap) { |
1925 | struct lwtunnel_state *lwtstate; | |
1926 | ||
30357d7d | 1927 | err = lwtunnel_build_state(cfg->fc_encap_type, |
127eb7cd TH |
1928 | cfg->fc_encap, AF_INET6, cfg, |
1929 | &lwtstate); | |
19e42e45 RP |
1930 | if (err) |
1931 | goto out; | |
61adedf3 JB |
1932 | rt->dst.lwtstate = lwtstate_get(lwtstate); |
1933 | if (lwtunnel_output_redirect(rt->dst.lwtstate)) { | |
1934 | rt->dst.lwtstate->orig_output = rt->dst.output; | |
1935 | rt->dst.output = lwtunnel_output; | |
25368623 | 1936 | } |
61adedf3 JB |
1937 | if (lwtunnel_input_redirect(rt->dst.lwtstate)) { |
1938 | rt->dst.lwtstate->orig_input = rt->dst.input; | |
1939 | rt->dst.input = lwtunnel_input; | |
25368623 | 1940 | } |
19e42e45 RP |
1941 | } |
1942 | ||
86872cb5 TG |
1943 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1944 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1945 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1946 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1947 | |
1da177e4 | 1948 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1949 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1950 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1951 | #endif |
1952 | ||
86872cb5 | 1953 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1954 | |
1955 | /* We cannot add true routes via loopback here, | |
1956 | they would result in kernel looping; promote them to reject routes | |
1957 | */ | |
86872cb5 | 1958 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1959 | (dev && (dev->flags & IFF_LOOPBACK) && |
1960 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1961 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1962 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1963 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1964 | if (dev) { |
1965 | dev_put(dev); | |
1966 | in6_dev_put(idev); | |
1967 | } | |
5578689a | 1968 | dev = net->loopback_dev; |
1da177e4 LT |
1969 | dev_hold(dev); |
1970 | idev = in6_dev_get(dev); | |
1971 | if (!idev) { | |
1972 | err = -ENODEV; | |
1973 | goto out; | |
1974 | } | |
1975 | } | |
1da177e4 | 1976 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1977 | switch (cfg->fc_type) { |
1978 | case RTN_BLACKHOLE: | |
1979 | rt->dst.error = -EINVAL; | |
ede2059d | 1980 | rt->dst.output = dst_discard_out; |
7150aede | 1981 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1982 | break; |
1983 | case RTN_PROHIBIT: | |
1984 | rt->dst.error = -EACCES; | |
7150aede K |
1985 | rt->dst.output = ip6_pkt_prohibit_out; |
1986 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1987 | break; |
b4949ab2 | 1988 | case RTN_THROW: |
0315e382 | 1989 | case RTN_UNREACHABLE: |
ef2c7d7b | 1990 | default: |
7150aede | 1991 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
0315e382 NF |
1992 | : (cfg->fc_type == RTN_UNREACHABLE) |
1993 | ? -EHOSTUNREACH : -ENETUNREACH; | |
7150aede K |
1994 | rt->dst.output = ip6_pkt_discard_out; |
1995 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1996 | break; |
1997 | } | |
1da177e4 LT |
1998 | goto install_route; |
1999 | } | |
2000 | ||
86872cb5 | 2001 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 2002 | const struct in6_addr *gw_addr; |
1da177e4 LT |
2003 | int gwa_type; |
2004 | ||
86872cb5 | 2005 | gw_addr = &cfg->fc_gateway; |
330567b7 | 2006 | gwa_type = ipv6_addr_type(gw_addr); |
48ed7b26 FW |
2007 | |
2008 | /* if gw_addr is local we will fail to detect this in case | |
2009 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
2010 | * will return already-added prefix route via interface that | |
2011 | * prefix route was assigned to, which might be non-loopback. | |
2012 | */ | |
2013 | err = -EINVAL; | |
330567b7 FW |
2014 | if (ipv6_chk_addr_and_flags(net, gw_addr, |
2015 | gwa_type & IPV6_ADDR_LINKLOCAL ? | |
2016 | dev : NULL, 0, 0)) | |
48ed7b26 FW |
2017 | goto out; |
2018 | ||
4e3fd7a0 | 2019 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
2020 | |
2021 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
8c14586f | 2022 | struct rt6_info *grt = NULL; |
1da177e4 LT |
2023 | |
2024 | /* IPv6 strictly inhibits using not link-local | |
2025 | addresses as nexthop address. | |
2026 | Otherwise, router will not able to send redirects. | |
2027 | It is very good, but in some (rare!) circumstances | |
2028 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
2029 | some exceptions. --ANK | |
96d5822c EN |
2030 | We allow IPv4-mapped nexthops to support RFC4798-type |
2031 | addressing | |
1da177e4 | 2032 | */ |
96d5822c EN |
2033 | if (!(gwa_type & (IPV6_ADDR_UNICAST | |
2034 | IPV6_ADDR_MAPPED))) | |
1da177e4 LT |
2035 | goto out; |
2036 | ||
a435a07f | 2037 | if (cfg->fc_table) { |
8c14586f DA |
2038 | grt = ip6_nh_lookup_table(net, cfg, gw_addr); |
2039 | ||
a435a07f VB |
2040 | if (grt) { |
2041 | if (grt->rt6i_flags & RTF_GATEWAY || | |
2042 | (dev && dev != grt->dst.dev)) { | |
2043 | ip6_rt_put(grt); | |
2044 | grt = NULL; | |
2045 | } | |
2046 | } | |
2047 | } | |
2048 | ||
8c14586f DA |
2049 | if (!grt) |
2050 | grt = rt6_lookup(net, gw_addr, NULL, | |
2051 | cfg->fc_ifindex, 1); | |
1da177e4 LT |
2052 | |
2053 | err = -EHOSTUNREACH; | |
38308473 | 2054 | if (!grt) |
1da177e4 LT |
2055 | goto out; |
2056 | if (dev) { | |
d1918542 | 2057 | if (dev != grt->dst.dev) { |
94e187c0 | 2058 | ip6_rt_put(grt); |
1da177e4 LT |
2059 | goto out; |
2060 | } | |
2061 | } else { | |
d1918542 | 2062 | dev = grt->dst.dev; |
1da177e4 LT |
2063 | idev = grt->rt6i_idev; |
2064 | dev_hold(dev); | |
2065 | in6_dev_hold(grt->rt6i_idev); | |
2066 | } | |
38308473 | 2067 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 2068 | err = 0; |
94e187c0 | 2069 | ip6_rt_put(grt); |
1da177e4 LT |
2070 | |
2071 | if (err) | |
2072 | goto out; | |
2073 | } | |
2074 | err = -EINVAL; | |
38308473 | 2075 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2076 | goto out; |
2077 | } | |
2078 | ||
2079 | err = -ENODEV; | |
38308473 | 2080 | if (!dev) |
1da177e4 LT |
2081 | goto out; |
2082 | ||
c3968a85 DW |
2083 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
2084 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
2085 | err = -EINVAL; | |
2086 | goto out; | |
2087 | } | |
4e3fd7a0 | 2088 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
2089 | rt->rt6i_prefsrc.plen = 128; |
2090 | } else | |
2091 | rt->rt6i_prefsrc.plen = 0; | |
2092 | ||
86872cb5 | 2093 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
2094 | |
2095 | install_route: | |
d8d1f30b | 2096 | rt->dst.dev = dev; |
1da177e4 | 2097 | rt->rt6i_idev = idev; |
c71099ac | 2098 | rt->rt6i_table = table; |
63152fc0 | 2099 | |
c346dca1 | 2100 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 2101 | |
8c5b83f0 | 2102 | return rt; |
6b9ea5a6 RP |
2103 | out: |
2104 | if (dev) | |
2105 | dev_put(dev); | |
2106 | if (idev) | |
2107 | in6_dev_put(idev); | |
2108 | if (rt) | |
2109 | dst_free(&rt->dst); | |
2110 | ||
8c5b83f0 | 2111 | return ERR_PTR(err); |
6b9ea5a6 RP |
2112 | } |
2113 | ||
2114 | int ip6_route_add(struct fib6_config *cfg) | |
2115 | { | |
2116 | struct mx6_config mxc = { .mx = NULL, }; | |
8c5b83f0 | 2117 | struct rt6_info *rt; |
6b9ea5a6 RP |
2118 | int err; |
2119 | ||
8c5b83f0 RP |
2120 | rt = ip6_route_info_create(cfg); |
2121 | if (IS_ERR(rt)) { | |
2122 | err = PTR_ERR(rt); | |
2123 | rt = NULL; | |
6b9ea5a6 | 2124 | goto out; |
8c5b83f0 | 2125 | } |
6b9ea5a6 | 2126 | |
e715b6d3 FW |
2127 | err = ip6_convert_metrics(&mxc, cfg); |
2128 | if (err) | |
2129 | goto out; | |
1da177e4 | 2130 | |
e715b6d3 FW |
2131 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
2132 | ||
2133 | kfree(mxc.mx); | |
6b9ea5a6 | 2134 | |
e715b6d3 | 2135 | return err; |
1da177e4 | 2136 | out: |
1da177e4 | 2137 | if (rt) |
d8d1f30b | 2138 | dst_free(&rt->dst); |
6b9ea5a6 | 2139 | |
1da177e4 LT |
2140 | return err; |
2141 | } | |
2142 | ||
86872cb5 | 2143 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2144 | { |
2145 | int err; | |
c71099ac | 2146 | struct fib6_table *table; |
d1918542 | 2147 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 2148 | |
8e3d5be7 MKL |
2149 | if (rt == net->ipv6.ip6_null_entry || |
2150 | rt->dst.flags & DST_NOCACHE) { | |
6825a26c G |
2151 | err = -ENOENT; |
2152 | goto out; | |
2153 | } | |
6c813a72 | 2154 | |
c71099ac TG |
2155 | table = rt->rt6i_table; |
2156 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 2157 | err = fib6_del(rt, info); |
c71099ac | 2158 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 2159 | |
6825a26c | 2160 | out: |
94e187c0 | 2161 | ip6_rt_put(rt); |
1da177e4 LT |
2162 | return err; |
2163 | } | |
2164 | ||
e0a1ad73 TG |
2165 | int ip6_del_rt(struct rt6_info *rt) |
2166 | { | |
4d1169c1 | 2167 | struct nl_info info = { |
d1918542 | 2168 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 2169 | }; |
528c4ceb | 2170 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
2171 | } |
2172 | ||
0ae81335 DA |
2173 | static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg) |
2174 | { | |
2175 | struct nl_info *info = &cfg->fc_nlinfo; | |
e3330039 | 2176 | struct net *net = info->nl_net; |
16a16cd3 | 2177 | struct sk_buff *skb = NULL; |
0ae81335 | 2178 | struct fib6_table *table; |
e3330039 | 2179 | int err = -ENOENT; |
0ae81335 | 2180 | |
e3330039 WC |
2181 | if (rt == net->ipv6.ip6_null_entry) |
2182 | goto out_put; | |
0ae81335 DA |
2183 | table = rt->rt6i_table; |
2184 | write_lock_bh(&table->tb6_lock); | |
2185 | ||
2186 | if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) { | |
2187 | struct rt6_info *sibling, *next_sibling; | |
2188 | ||
16a16cd3 DA |
2189 | /* prefer to send a single notification with all hops */ |
2190 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); | |
2191 | if (skb) { | |
2192 | u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0; | |
2193 | ||
e3330039 | 2194 | if (rt6_fill_node(net, skb, rt, |
16a16cd3 DA |
2195 | NULL, NULL, 0, RTM_DELROUTE, |
2196 | info->portid, seq, 0) < 0) { | |
2197 | kfree_skb(skb); | |
2198 | skb = NULL; | |
2199 | } else | |
2200 | info->skip_notify = 1; | |
2201 | } | |
2202 | ||
0ae81335 DA |
2203 | list_for_each_entry_safe(sibling, next_sibling, |
2204 | &rt->rt6i_siblings, | |
2205 | rt6i_siblings) { | |
2206 | err = fib6_del(sibling, info); | |
2207 | if (err) | |
e3330039 | 2208 | goto out_unlock; |
0ae81335 DA |
2209 | } |
2210 | } | |
2211 | ||
2212 | err = fib6_del(rt, info); | |
e3330039 | 2213 | out_unlock: |
0ae81335 | 2214 | write_unlock_bh(&table->tb6_lock); |
e3330039 | 2215 | out_put: |
0ae81335 | 2216 | ip6_rt_put(rt); |
16a16cd3 DA |
2217 | |
2218 | if (skb) { | |
e3330039 | 2219 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
16a16cd3 DA |
2220 | info->nlh, gfp_any()); |
2221 | } | |
0ae81335 DA |
2222 | return err; |
2223 | } | |
2224 | ||
86872cb5 | 2225 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 2226 | { |
c71099ac | 2227 | struct fib6_table *table; |
1da177e4 LT |
2228 | struct fib6_node *fn; |
2229 | struct rt6_info *rt; | |
2230 | int err = -ESRCH; | |
2231 | ||
5578689a | 2232 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 2233 | if (!table) |
c71099ac TG |
2234 | return err; |
2235 | ||
2236 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 2237 | |
c71099ac | 2238 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
2239 | &cfg->fc_dst, cfg->fc_dst_len, |
2240 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 2241 | |
1da177e4 | 2242 | if (fn) { |
d8d1f30b | 2243 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
2244 | if ((rt->rt6i_flags & RTF_CACHE) && |
2245 | !(cfg->fc_flags & RTF_CACHE)) | |
2246 | continue; | |
86872cb5 | 2247 | if (cfg->fc_ifindex && |
d1918542 DM |
2248 | (!rt->dst.dev || |
2249 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 2250 | continue; |
86872cb5 TG |
2251 | if (cfg->fc_flags & RTF_GATEWAY && |
2252 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 2253 | continue; |
86872cb5 | 2254 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 2255 | continue; |
c2ed1880 M |
2256 | if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol) |
2257 | continue; | |
d8d1f30b | 2258 | dst_hold(&rt->dst); |
c71099ac | 2259 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2260 | |
0ae81335 DA |
2261 | /* if gateway was specified only delete the one hop */ |
2262 | if (cfg->fc_flags & RTF_GATEWAY) | |
2263 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); | |
2264 | ||
2265 | return __ip6_del_rt_siblings(rt, cfg); | |
1da177e4 LT |
2266 | } |
2267 | } | |
c71099ac | 2268 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2269 | |
2270 | return err; | |
2271 | } | |
2272 | ||
6700c270 | 2273 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2274 | { |
a6279458 | 2275 | struct netevent_redirect netevent; |
e8599ff4 | 2276 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2277 | struct ndisc_options ndopts; |
2278 | struct inet6_dev *in6_dev; | |
2279 | struct neighbour *neigh; | |
71bcdba0 | 2280 | struct rd_msg *msg; |
6e157b6a DM |
2281 | int optlen, on_link; |
2282 | u8 *lladdr; | |
e8599ff4 | 2283 | |
29a3cad5 | 2284 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2285 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2286 | |
2287 | if (optlen < 0) { | |
6e157b6a | 2288 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2289 | return; |
2290 | } | |
2291 | ||
71bcdba0 | 2292 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2293 | |
71bcdba0 | 2294 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2295 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2296 | return; |
2297 | } | |
2298 | ||
6e157b6a | 2299 | on_link = 0; |
71bcdba0 | 2300 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2301 | on_link = 1; |
71bcdba0 | 2302 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2303 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2304 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2305 | return; |
2306 | } | |
2307 | ||
2308 | in6_dev = __in6_dev_get(skb->dev); | |
2309 | if (!in6_dev) | |
2310 | return; | |
2311 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2312 | return; | |
2313 | ||
2314 | /* RFC2461 8.1: | |
2315 | * The IP source address of the Redirect MUST be the same as the current | |
2316 | * first-hop router for the specified ICMP Destination Address. | |
2317 | */ | |
2318 | ||
f997c55c | 2319 | if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2320 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2321 | return; | |
2322 | } | |
6e157b6a DM |
2323 | |
2324 | lladdr = NULL; | |
e8599ff4 DM |
2325 | if (ndopts.nd_opts_tgt_lladdr) { |
2326 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2327 | skb->dev); | |
2328 | if (!lladdr) { | |
2329 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2330 | return; | |
2331 | } | |
2332 | } | |
2333 | ||
6e157b6a | 2334 | rt = (struct rt6_info *) dst; |
ec13ad1d | 2335 | if (rt->rt6i_flags & RTF_REJECT) { |
6e157b6a | 2336 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
e8599ff4 | 2337 | return; |
6e157b6a | 2338 | } |
e8599ff4 | 2339 | |
6e157b6a DM |
2340 | /* Redirect received -> path was valid. |
2341 | * Look, redirects are sent only in response to data packets, | |
2342 | * so that this nexthop apparently is reachable. --ANK | |
2343 | */ | |
0dec879f | 2344 | dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr); |
a6279458 | 2345 | |
71bcdba0 | 2346 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2347 | if (!neigh) |
2348 | return; | |
a6279458 | 2349 | |
1da177e4 LT |
2350 | /* |
2351 | * We have finally decided to accept it. | |
2352 | */ | |
2353 | ||
f997c55c | 2354 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2355 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2356 | NEIGH_UPDATE_F_OVERRIDE| | |
2357 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
2358 | NEIGH_UPDATE_F_ISROUTER)), |
2359 | NDISC_REDIRECT, &ndopts); | |
1da177e4 | 2360 | |
83a09abd | 2361 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2362 | if (!nrt) |
1da177e4 LT |
2363 | goto out; |
2364 | ||
2365 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2366 | if (on_link) | |
2367 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2368 | ||
4e3fd7a0 | 2369 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2370 | |
40e22e8f | 2371 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2372 | goto out; |
2373 | ||
d8d1f30b CG |
2374 | netevent.old = &rt->dst; |
2375 | netevent.new = &nrt->dst; | |
71bcdba0 | 2376 | netevent.daddr = &msg->dest; |
60592833 | 2377 | netevent.neigh = neigh; |
8d71740c TT |
2378 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2379 | ||
38308473 | 2380 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2381 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2382 | ip6_del_rt(rt); |
1da177e4 LT |
2383 | } |
2384 | ||
2385 | out: | |
e8599ff4 | 2386 | neigh_release(neigh); |
6e157b6a DM |
2387 | } |
2388 | ||
1da177e4 LT |
2389 | /* |
2390 | * Misc support functions | |
2391 | */ | |
2392 | ||
4b32b5ad MKL |
2393 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2394 | { | |
2395 | BUG_ON(from->dst.from); | |
2396 | ||
2397 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2398 | dst_hold(&from->dst); | |
2399 | rt->dst.from = &from->dst; | |
2400 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2401 | } | |
2402 | ||
83a09abd MKL |
2403 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2404 | { | |
2405 | rt->dst.input = ort->dst.input; | |
2406 | rt->dst.output = ort->dst.output; | |
2407 | rt->rt6i_dst = ort->rt6i_dst; | |
2408 | rt->dst.error = ort->dst.error; | |
2409 | rt->rt6i_idev = ort->rt6i_idev; | |
2410 | if (rt->rt6i_idev) | |
2411 | in6_dev_hold(rt->rt6i_idev); | |
2412 | rt->dst.lastuse = jiffies; | |
2413 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2414 | rt->rt6i_flags = ort->rt6i_flags; | |
2415 | rt6_set_from(rt, ort); | |
2416 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2417 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2418 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2419 | #endif |
83a09abd MKL |
2420 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2421 | rt->rt6i_table = ort->rt6i_table; | |
61adedf3 | 2422 | rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate); |
1da177e4 LT |
2423 | } |
2424 | ||
70ceb4f5 | 2425 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2426 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 | 2427 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
2428 | const struct in6_addr *gwaddr, |
2429 | struct net_device *dev) | |
70ceb4f5 | 2430 | { |
830218c1 DA |
2431 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO; |
2432 | int ifindex = dev->ifindex; | |
70ceb4f5 YH |
2433 | struct fib6_node *fn; |
2434 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2435 | struct fib6_table *table; |
2436 | ||
830218c1 | 2437 | table = fib6_get_table(net, tb_id); |
38308473 | 2438 | if (!table) |
c71099ac | 2439 | return NULL; |
70ceb4f5 | 2440 | |
5744dd9b | 2441 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2442 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2443 | if (!fn) |
2444 | goto out; | |
2445 | ||
d8d1f30b | 2446 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2447 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2448 | continue; |
2449 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2450 | continue; | |
2451 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2452 | continue; | |
d8d1f30b | 2453 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2454 | break; |
2455 | } | |
2456 | out: | |
5744dd9b | 2457 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2458 | return rt; |
2459 | } | |
2460 | ||
efa2cea0 | 2461 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 | 2462 | const struct in6_addr *prefix, int prefixlen, |
830218c1 DA |
2463 | const struct in6_addr *gwaddr, |
2464 | struct net_device *dev, | |
95c96174 | 2465 | unsigned int pref) |
70ceb4f5 | 2466 | { |
86872cb5 | 2467 | struct fib6_config cfg = { |
238fc7ea | 2468 | .fc_metric = IP6_RT_PRIO_USER, |
830218c1 | 2469 | .fc_ifindex = dev->ifindex, |
86872cb5 TG |
2470 | .fc_dst_len = prefixlen, |
2471 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2472 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2473 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2474 | .fc_nlinfo.nlh = NULL, |
2475 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2476 | }; |
2477 | ||
830218c1 | 2478 | cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO, |
4e3fd7a0 AD |
2479 | cfg.fc_dst = *prefix; |
2480 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2481 | |
e317da96 YH |
2482 | /* We should treat it as a default route if prefix length is 0. */ |
2483 | if (!prefixlen) | |
86872cb5 | 2484 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2485 | |
86872cb5 | 2486 | ip6_route_add(&cfg); |
70ceb4f5 | 2487 | |
830218c1 | 2488 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev); |
70ceb4f5 YH |
2489 | } |
2490 | #endif | |
2491 | ||
b71d1d42 | 2492 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2493 | { |
830218c1 | 2494 | u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT; |
1da177e4 | 2495 | struct rt6_info *rt; |
c71099ac | 2496 | struct fib6_table *table; |
1da177e4 | 2497 | |
830218c1 | 2498 | table = fib6_get_table(dev_net(dev), tb_id); |
38308473 | 2499 | if (!table) |
c71099ac | 2500 | return NULL; |
1da177e4 | 2501 | |
5744dd9b | 2502 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2503 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2504 | if (dev == rt->dst.dev && |
045927ff | 2505 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2506 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2507 | break; | |
2508 | } | |
2509 | if (rt) | |
d8d1f30b | 2510 | dst_hold(&rt->dst); |
5744dd9b | 2511 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2512 | return rt; |
2513 | } | |
2514 | ||
b71d1d42 | 2515 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2516 | struct net_device *dev, |
2517 | unsigned int pref) | |
1da177e4 | 2518 | { |
86872cb5 | 2519 | struct fib6_config cfg = { |
ca254490 | 2520 | .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT, |
238fc7ea | 2521 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2522 | .fc_ifindex = dev->ifindex, |
2523 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2524 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2525 | .fc_nlinfo.portid = 0, |
5578689a | 2526 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2527 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2528 | }; |
1da177e4 | 2529 | |
4e3fd7a0 | 2530 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2531 | |
830218c1 DA |
2532 | if (!ip6_route_add(&cfg)) { |
2533 | struct fib6_table *table; | |
2534 | ||
2535 | table = fib6_get_table(dev_net(dev), cfg.fc_table); | |
2536 | if (table) | |
2537 | table->flags |= RT6_TABLE_HAS_DFLT_ROUTER; | |
2538 | } | |
1da177e4 | 2539 | |
1da177e4 LT |
2540 | return rt6_get_dflt_router(gwaddr, dev); |
2541 | } | |
2542 | ||
830218c1 | 2543 | static void __rt6_purge_dflt_routers(struct fib6_table *table) |
1da177e4 LT |
2544 | { |
2545 | struct rt6_info *rt; | |
2546 | ||
2547 | restart: | |
c71099ac | 2548 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2549 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2550 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2551 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2552 | dst_hold(&rt->dst); |
c71099ac | 2553 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2554 | ip6_del_rt(rt); |
1da177e4 LT |
2555 | goto restart; |
2556 | } | |
2557 | } | |
c71099ac | 2558 | read_unlock_bh(&table->tb6_lock); |
830218c1 DA |
2559 | |
2560 | table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER; | |
2561 | } | |
2562 | ||
2563 | void rt6_purge_dflt_routers(struct net *net) | |
2564 | { | |
2565 | struct fib6_table *table; | |
2566 | struct hlist_head *head; | |
2567 | unsigned int h; | |
2568 | ||
2569 | rcu_read_lock(); | |
2570 | ||
2571 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
2572 | head = &net->ipv6.fib_table_hash[h]; | |
2573 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { | |
2574 | if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER) | |
2575 | __rt6_purge_dflt_routers(table); | |
2576 | } | |
2577 | } | |
2578 | ||
2579 | rcu_read_unlock(); | |
1da177e4 LT |
2580 | } |
2581 | ||
5578689a DL |
2582 | static void rtmsg_to_fib6_config(struct net *net, |
2583 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2584 | struct fib6_config *cfg) |
2585 | { | |
2586 | memset(cfg, 0, sizeof(*cfg)); | |
2587 | ||
ca254490 DA |
2588 | cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ? |
2589 | : RT6_TABLE_MAIN; | |
86872cb5 TG |
2590 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
2591 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2592 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2593 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2594 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2595 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2596 | ||
5578689a | 2597 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2598 | |
4e3fd7a0 AD |
2599 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2600 | cfg->fc_src = rtmsg->rtmsg_src; | |
2601 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2602 | } |
2603 | ||
5578689a | 2604 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2605 | { |
86872cb5 | 2606 | struct fib6_config cfg; |
1da177e4 LT |
2607 | struct in6_rtmsg rtmsg; |
2608 | int err; | |
2609 | ||
67ba4152 | 2610 | switch (cmd) { |
1da177e4 LT |
2611 | case SIOCADDRT: /* Add a route */ |
2612 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2613 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2614 | return -EPERM; |
2615 | err = copy_from_user(&rtmsg, arg, | |
2616 | sizeof(struct in6_rtmsg)); | |
2617 | if (err) | |
2618 | return -EFAULT; | |
86872cb5 | 2619 | |
5578689a | 2620 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2621 | |
1da177e4 LT |
2622 | rtnl_lock(); |
2623 | switch (cmd) { | |
2624 | case SIOCADDRT: | |
86872cb5 | 2625 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2626 | break; |
2627 | case SIOCDELRT: | |
86872cb5 | 2628 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2629 | break; |
2630 | default: | |
2631 | err = -EINVAL; | |
2632 | } | |
2633 | rtnl_unlock(); | |
2634 | ||
2635 | return err; | |
3ff50b79 | 2636 | } |
1da177e4 LT |
2637 | |
2638 | return -EINVAL; | |
2639 | } | |
2640 | ||
2641 | /* | |
2642 | * Drop the packet on the floor | |
2643 | */ | |
2644 | ||
d5fdd6ba | 2645 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2646 | { |
612f09e8 | 2647 | int type; |
adf30907 | 2648 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2649 | switch (ipstats_mib_noroutes) { |
2650 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2651 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2652 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2653 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2654 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2655 | break; |
2656 | } | |
2657 | /* FALLTHROUGH */ | |
2658 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2659 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2660 | ipstats_mib_noroutes); | |
612f09e8 YH |
2661 | break; |
2662 | } | |
3ffe533c | 2663 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2664 | kfree_skb(skb); |
2665 | return 0; | |
2666 | } | |
2667 | ||
9ce8ade0 TG |
2668 | static int ip6_pkt_discard(struct sk_buff *skb) |
2669 | { | |
612f09e8 | 2670 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2671 | } |
2672 | ||
ede2059d | 2673 | static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2674 | { |
adf30907 | 2675 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2676 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2677 | } |
2678 | ||
9ce8ade0 TG |
2679 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2680 | { | |
612f09e8 | 2681 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2682 | } |
2683 | ||
ede2059d | 2684 | static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2685 | { |
adf30907 | 2686 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2687 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2688 | } |
2689 | ||
1da177e4 LT |
2690 | /* |
2691 | * Allocate a dst for local (unicast / anycast) address. | |
2692 | */ | |
2693 | ||
2694 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2695 | const struct in6_addr *addr, | |
8f031519 | 2696 | bool anycast) |
1da177e4 | 2697 | { |
ca254490 | 2698 | u32 tb_id; |
c346dca1 | 2699 | struct net *net = dev_net(idev->dev); |
5f02ce24 DA |
2700 | struct net_device *dev = net->loopback_dev; |
2701 | struct rt6_info *rt; | |
2702 | ||
2703 | /* use L3 Master device as loopback for host routes if device | |
2704 | * is enslaved and address is not link local or multicast | |
2705 | */ | |
2706 | if (!rt6_need_strict(addr)) | |
2707 | dev = l3mdev_master_dev_rcu(idev->dev) ? : dev; | |
2708 | ||
2709 | rt = ip6_dst_alloc(net, dev, DST_NOCOUNT); | |
a3300ef4 | 2710 | if (!rt) |
1da177e4 LT |
2711 | return ERR_PTR(-ENOMEM); |
2712 | ||
1da177e4 LT |
2713 | in6_dev_hold(idev); |
2714 | ||
11d53b49 | 2715 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2716 | rt->dst.input = ip6_input; |
2717 | rt->dst.output = ip6_output; | |
1da177e4 | 2718 | rt->rt6i_idev = idev; |
1da177e4 | 2719 | |
94b5e0f9 | 2720 | rt->rt6i_protocol = RTPROT_KERNEL; |
1da177e4 | 2721 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
58c4fb86 YH |
2722 | if (anycast) |
2723 | rt->rt6i_flags |= RTF_ANYCAST; | |
2724 | else | |
1da177e4 | 2725 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2726 | |
550bab42 | 2727 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2728 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2729 | rt->rt6i_dst.plen = 128; |
ca254490 DA |
2730 | tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL; |
2731 | rt->rt6i_table = fib6_get_table(net, tb_id); | |
8e3d5be7 | 2732 | rt->dst.flags |= DST_NOCACHE; |
1da177e4 | 2733 | |
d8d1f30b | 2734 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2735 | |
2736 | return rt; | |
2737 | } | |
2738 | ||
c3968a85 DW |
2739 | /* remove deleted ip from prefsrc entries */ |
2740 | struct arg_dev_net_ip { | |
2741 | struct net_device *dev; | |
2742 | struct net *net; | |
2743 | struct in6_addr *addr; | |
2744 | }; | |
2745 | ||
2746 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2747 | { | |
2748 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2749 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2750 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2751 | ||
d1918542 | 2752 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2753 | rt != net->ipv6.ip6_null_entry && |
2754 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2755 | /* remove prefsrc entry */ | |
2756 | rt->rt6i_prefsrc.plen = 0; | |
2757 | } | |
2758 | return 0; | |
2759 | } | |
2760 | ||
2761 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2762 | { | |
2763 | struct net *net = dev_net(ifp->idev->dev); | |
2764 | struct arg_dev_net_ip adni = { | |
2765 | .dev = ifp->idev->dev, | |
2766 | .net = net, | |
2767 | .addr = &ifp->addr, | |
2768 | }; | |
0c3584d5 | 2769 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2770 | } |
2771 | ||
be7a010d DJ |
2772 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2773 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2774 | ||
2775 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2776 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2777 | { | |
2778 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2779 | ||
2780 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2781 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2782 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2783 | return -1; | |
2784 | } | |
2785 | return 0; | |
2786 | } | |
2787 | ||
2788 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2789 | { | |
2790 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2791 | } | |
2792 | ||
8ed67789 DL |
2793 | struct arg_dev_net { |
2794 | struct net_device *dev; | |
2795 | struct net *net; | |
2796 | }; | |
2797 | ||
a1a22c12 | 2798 | /* called with write lock held for table with rt */ |
1da177e4 LT |
2799 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2800 | { | |
bc3ef660 | 2801 | const struct arg_dev_net *adn = arg; |
2802 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2803 | |
d1918542 | 2804 | if ((rt->dst.dev == dev || !dev) && |
a1a22c12 DA |
2805 | rt != adn->net->ipv6.ip6_null_entry && |
2806 | (rt->rt6i_nsiblings == 0 || | |
2807 | !rt->rt6i_idev->cnf.ignore_routes_with_linkdown)) | |
1da177e4 | 2808 | return -1; |
c159d30c | 2809 | |
1da177e4 LT |
2810 | return 0; |
2811 | } | |
2812 | ||
f3db4851 | 2813 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2814 | { |
8ed67789 DL |
2815 | struct arg_dev_net adn = { |
2816 | .dev = dev, | |
2817 | .net = net, | |
2818 | }; | |
2819 | ||
0c3584d5 | 2820 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2821 | icmp6_clean_all(fib6_ifdown, &adn); |
e332bc67 EB |
2822 | if (dev) |
2823 | rt6_uncached_list_flush_dev(net, dev); | |
1da177e4 LT |
2824 | } |
2825 | ||
95c96174 | 2826 | struct rt6_mtu_change_arg { |
1da177e4 | 2827 | struct net_device *dev; |
95c96174 | 2828 | unsigned int mtu; |
1da177e4 LT |
2829 | }; |
2830 | ||
2831 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2832 | { | |
2833 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2834 | struct inet6_dev *idev; | |
2835 | ||
2836 | /* In IPv6 pmtu discovery is not optional, | |
2837 | so that RTAX_MTU lock cannot disable it. | |
2838 | We still use this lock to block changes | |
2839 | caused by addrconf/ndisc. | |
2840 | */ | |
2841 | ||
2842 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2843 | if (!idev) |
1da177e4 LT |
2844 | return 0; |
2845 | ||
2846 | /* For administrative MTU increase, there is no way to discover | |
2847 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2848 | Since RFC 1981 doesn't include administrative MTU increase | |
2849 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2850 | */ | |
2851 | /* | |
2852 | If new MTU is less than route PMTU, this new MTU will be the | |
2853 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2854 | decreases; if new MTU is greater than route PMTU, and the | |
2855 | old MTU is the lowest MTU in the path, update the route PMTU | |
2856 | to reflect the increase. In this case if the other nodes' MTU | |
2857 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
67c408cf | 2858 | PMTU discovery. |
1da177e4 | 2859 | */ |
d1918542 | 2860 | if (rt->dst.dev == arg->dev && |
fb56be83 | 2861 | dst_metric_raw(&rt->dst, RTAX_MTU) && |
4b32b5ad MKL |
2862 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2863 | if (rt->rt6i_flags & RTF_CACHE) { | |
2864 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2865 | * (i.e. a redirected route), | |
2866 | * the metrics of its rt->dst.from has already | |
2867 | * been updated. | |
2868 | */ | |
2869 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2870 | rt->rt6i_pmtu = arg->mtu; | |
2871 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2872 | (dst_mtu(&rt->dst) < arg->mtu && | |
2873 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2874 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2875 | } | |
566cfd8f | 2876 | } |
1da177e4 LT |
2877 | return 0; |
2878 | } | |
2879 | ||
95c96174 | 2880 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2881 | { |
c71099ac TG |
2882 | struct rt6_mtu_change_arg arg = { |
2883 | .dev = dev, | |
2884 | .mtu = mtu, | |
2885 | }; | |
1da177e4 | 2886 | |
0c3584d5 | 2887 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2888 | } |
2889 | ||
ef7c79ed | 2890 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2891 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2892 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2893 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2894 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2895 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2896 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2897 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2898 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2899 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
32bc201e | 2900 | [RTA_EXPIRES] = { .type = NLA_U32 }, |
622ec2c9 | 2901 | [RTA_UID] = { .type = NLA_U32 }, |
3b45a410 | 2902 | [RTA_MARK] = { .type = NLA_U32 }, |
86872cb5 TG |
2903 | }; |
2904 | ||
2905 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2906 | struct fib6_config *cfg) | |
1da177e4 | 2907 | { |
86872cb5 TG |
2908 | struct rtmsg *rtm; |
2909 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2910 | unsigned int pref; |
86872cb5 | 2911 | int err; |
1da177e4 | 2912 | |
fceb6435 JB |
2913 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy, |
2914 | NULL); | |
86872cb5 TG |
2915 | if (err < 0) |
2916 | goto errout; | |
1da177e4 | 2917 | |
86872cb5 TG |
2918 | err = -EINVAL; |
2919 | rtm = nlmsg_data(nlh); | |
2920 | memset(cfg, 0, sizeof(*cfg)); | |
2921 | ||
2922 | cfg->fc_table = rtm->rtm_table; | |
2923 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2924 | cfg->fc_src_len = rtm->rtm_src_len; | |
2925 | cfg->fc_flags = RTF_UP; | |
2926 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2927 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2928 | |
ef2c7d7b ND |
2929 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2930 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2931 | rtm->rtm_type == RTN_PROHIBIT || |
2932 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2933 | cfg->fc_flags |= RTF_REJECT; |
2934 | ||
ab79ad14 MŻ |
2935 | if (rtm->rtm_type == RTN_LOCAL) |
2936 | cfg->fc_flags |= RTF_LOCAL; | |
2937 | ||
1f56a01f MKL |
2938 | if (rtm->rtm_flags & RTM_F_CLONED) |
2939 | cfg->fc_flags |= RTF_CACHE; | |
2940 | ||
15e47304 | 2941 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2942 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2943 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2944 | |
2945 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2946 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2947 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2948 | } |
86872cb5 TG |
2949 | |
2950 | if (tb[RTA_DST]) { | |
2951 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2952 | ||
2953 | if (nla_len(tb[RTA_DST]) < plen) | |
2954 | goto errout; | |
2955 | ||
2956 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2957 | } |
86872cb5 TG |
2958 | |
2959 | if (tb[RTA_SRC]) { | |
2960 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2961 | ||
2962 | if (nla_len(tb[RTA_SRC]) < plen) | |
2963 | goto errout; | |
2964 | ||
2965 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2966 | } |
86872cb5 | 2967 | |
c3968a85 | 2968 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2969 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2970 | |
86872cb5 TG |
2971 | if (tb[RTA_OIF]) |
2972 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2973 | ||
2974 | if (tb[RTA_PRIORITY]) | |
2975 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2976 | ||
2977 | if (tb[RTA_METRICS]) { | |
2978 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2979 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2980 | } |
86872cb5 TG |
2981 | |
2982 | if (tb[RTA_TABLE]) | |
2983 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2984 | ||
51ebd318 ND |
2985 | if (tb[RTA_MULTIPATH]) { |
2986 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2987 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
9ed59592 DA |
2988 | |
2989 | err = lwtunnel_valid_encap_type_attr(cfg->fc_mp, | |
2990 | cfg->fc_mp_len); | |
2991 | if (err < 0) | |
2992 | goto errout; | |
51ebd318 ND |
2993 | } |
2994 | ||
c78ba6d6 LR |
2995 | if (tb[RTA_PREF]) { |
2996 | pref = nla_get_u8(tb[RTA_PREF]); | |
2997 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2998 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2999 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
3000 | cfg->fc_flags |= RTF_PREF(pref); | |
3001 | } | |
3002 | ||
19e42e45 RP |
3003 | if (tb[RTA_ENCAP]) |
3004 | cfg->fc_encap = tb[RTA_ENCAP]; | |
3005 | ||
9ed59592 | 3006 | if (tb[RTA_ENCAP_TYPE]) { |
19e42e45 RP |
3007 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); |
3008 | ||
9ed59592 DA |
3009 | err = lwtunnel_valid_encap_type(cfg->fc_encap_type); |
3010 | if (err < 0) | |
3011 | goto errout; | |
3012 | } | |
3013 | ||
32bc201e XL |
3014 | if (tb[RTA_EXPIRES]) { |
3015 | unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ); | |
3016 | ||
3017 | if (addrconf_finite_timeout(timeout)) { | |
3018 | cfg->fc_expires = jiffies_to_clock_t(timeout * HZ); | |
3019 | cfg->fc_flags |= RTF_EXPIRES; | |
3020 | } | |
3021 | } | |
3022 | ||
86872cb5 TG |
3023 | err = 0; |
3024 | errout: | |
3025 | return err; | |
1da177e4 LT |
3026 | } |
3027 | ||
6b9ea5a6 RP |
3028 | struct rt6_nh { |
3029 | struct rt6_info *rt6_info; | |
3030 | struct fib6_config r_cfg; | |
3031 | struct mx6_config mxc; | |
3032 | struct list_head next; | |
3033 | }; | |
3034 | ||
3035 | static void ip6_print_replace_route_err(struct list_head *rt6_nh_list) | |
3036 | { | |
3037 | struct rt6_nh *nh; | |
3038 | ||
3039 | list_for_each_entry(nh, rt6_nh_list, next) { | |
7d4d5065 | 3040 | pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n", |
6b9ea5a6 RP |
3041 | &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway, |
3042 | nh->r_cfg.fc_ifindex); | |
3043 | } | |
3044 | } | |
3045 | ||
3046 | static int ip6_route_info_append(struct list_head *rt6_nh_list, | |
3047 | struct rt6_info *rt, struct fib6_config *r_cfg) | |
3048 | { | |
3049 | struct rt6_nh *nh; | |
3050 | struct rt6_info *rtnh; | |
3051 | int err = -EEXIST; | |
3052 | ||
3053 | list_for_each_entry(nh, rt6_nh_list, next) { | |
3054 | /* check if rt6_info already exists */ | |
3055 | rtnh = nh->rt6_info; | |
3056 | ||
3057 | if (rtnh->dst.dev == rt->dst.dev && | |
3058 | rtnh->rt6i_idev == rt->rt6i_idev && | |
3059 | ipv6_addr_equal(&rtnh->rt6i_gateway, | |
3060 | &rt->rt6i_gateway)) | |
3061 | return err; | |
3062 | } | |
3063 | ||
3064 | nh = kzalloc(sizeof(*nh), GFP_KERNEL); | |
3065 | if (!nh) | |
3066 | return -ENOMEM; | |
3067 | nh->rt6_info = rt; | |
3068 | err = ip6_convert_metrics(&nh->mxc, r_cfg); | |
3069 | if (err) { | |
3070 | kfree(nh); | |
3071 | return err; | |
3072 | } | |
3073 | memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg)); | |
3074 | list_add_tail(&nh->next, rt6_nh_list); | |
3075 | ||
3076 | return 0; | |
3077 | } | |
3078 | ||
3b1137fe DA |
3079 | static void ip6_route_mpath_notify(struct rt6_info *rt, |
3080 | struct rt6_info *rt_last, | |
3081 | struct nl_info *info, | |
3082 | __u16 nlflags) | |
3083 | { | |
3084 | /* if this is an APPEND route, then rt points to the first route | |
3085 | * inserted and rt_last points to last route inserted. Userspace | |
3086 | * wants a consistent dump of the route which starts at the first | |
3087 | * nexthop. Since sibling routes are always added at the end of | |
3088 | * the list, find the first sibling of the last route appended | |
3089 | */ | |
3090 | if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) { | |
3091 | rt = list_first_entry(&rt_last->rt6i_siblings, | |
3092 | struct rt6_info, | |
3093 | rt6i_siblings); | |
3094 | } | |
3095 | ||
3096 | if (rt) | |
3097 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
3098 | } | |
3099 | ||
6b9ea5a6 | 3100 | static int ip6_route_multipath_add(struct fib6_config *cfg) |
51ebd318 | 3101 | { |
3b1137fe DA |
3102 | struct rt6_info *rt_notif = NULL, *rt_last = NULL; |
3103 | struct nl_info *info = &cfg->fc_nlinfo; | |
51ebd318 ND |
3104 | struct fib6_config r_cfg; |
3105 | struct rtnexthop *rtnh; | |
6b9ea5a6 RP |
3106 | struct rt6_info *rt; |
3107 | struct rt6_nh *err_nh; | |
3108 | struct rt6_nh *nh, *nh_safe; | |
3b1137fe | 3109 | __u16 nlflags; |
51ebd318 ND |
3110 | int remaining; |
3111 | int attrlen; | |
6b9ea5a6 RP |
3112 | int err = 1; |
3113 | int nhn = 0; | |
3114 | int replace = (cfg->fc_nlinfo.nlh && | |
3115 | (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE)); | |
3116 | LIST_HEAD(rt6_nh_list); | |
51ebd318 | 3117 | |
3b1137fe DA |
3118 | nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE; |
3119 | if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND) | |
3120 | nlflags |= NLM_F_APPEND; | |
3121 | ||
35f1b4e9 | 3122 | remaining = cfg->fc_mp_len; |
51ebd318 | 3123 | rtnh = (struct rtnexthop *)cfg->fc_mp; |
51ebd318 | 3124 | |
6b9ea5a6 RP |
3125 | /* Parse a Multipath Entry and build a list (rt6_nh_list) of |
3126 | * rt6_info structs per nexthop | |
3127 | */ | |
51ebd318 ND |
3128 | while (rtnh_ok(rtnh, remaining)) { |
3129 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3130 | if (rtnh->rtnh_ifindex) | |
3131 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3132 | ||
3133 | attrlen = rtnh_attrlen(rtnh); | |
3134 | if (attrlen > 0) { | |
3135 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3136 | ||
3137 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3138 | if (nla) { | |
67b61f6c | 3139 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
3140 | r_cfg.fc_flags |= RTF_GATEWAY; |
3141 | } | |
19e42e45 RP |
3142 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
3143 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
3144 | if (nla) | |
3145 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 | 3146 | } |
6b9ea5a6 | 3147 | |
8c5b83f0 RP |
3148 | rt = ip6_route_info_create(&r_cfg); |
3149 | if (IS_ERR(rt)) { | |
3150 | err = PTR_ERR(rt); | |
3151 | rt = NULL; | |
6b9ea5a6 | 3152 | goto cleanup; |
8c5b83f0 | 3153 | } |
6b9ea5a6 RP |
3154 | |
3155 | err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg); | |
51ebd318 | 3156 | if (err) { |
6b9ea5a6 RP |
3157 | dst_free(&rt->dst); |
3158 | goto cleanup; | |
3159 | } | |
3160 | ||
3161 | rtnh = rtnh_next(rtnh, &remaining); | |
3162 | } | |
3163 | ||
3b1137fe DA |
3164 | /* for add and replace send one notification with all nexthops. |
3165 | * Skip the notification in fib6_add_rt2node and send one with | |
3166 | * the full route when done | |
3167 | */ | |
3168 | info->skip_notify = 1; | |
3169 | ||
6b9ea5a6 RP |
3170 | err_nh = NULL; |
3171 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3b1137fe DA |
3172 | rt_last = nh->rt6_info; |
3173 | err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc); | |
3174 | /* save reference to first route for notification */ | |
3175 | if (!rt_notif && !err) | |
3176 | rt_notif = nh->rt6_info; | |
3177 | ||
6b9ea5a6 RP |
3178 | /* nh->rt6_info is used or freed at this point, reset to NULL*/ |
3179 | nh->rt6_info = NULL; | |
3180 | if (err) { | |
3181 | if (replace && nhn) | |
3182 | ip6_print_replace_route_err(&rt6_nh_list); | |
3183 | err_nh = nh; | |
3184 | goto add_errout; | |
51ebd318 | 3185 | } |
6b9ea5a6 | 3186 | |
1a72418b | 3187 | /* Because each route is added like a single route we remove |
27596472 MK |
3188 | * these flags after the first nexthop: if there is a collision, |
3189 | * we have already failed to add the first nexthop: | |
3190 | * fib6_add_rt2node() has rejected it; when replacing, old | |
3191 | * nexthops have been replaced by first new, the rest should | |
3192 | * be added to it. | |
1a72418b | 3193 | */ |
27596472 MK |
3194 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
3195 | NLM_F_REPLACE); | |
6b9ea5a6 RP |
3196 | nhn++; |
3197 | } | |
3198 | ||
3b1137fe DA |
3199 | /* success ... tell user about new route */ |
3200 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
6b9ea5a6 RP |
3201 | goto cleanup; |
3202 | ||
3203 | add_errout: | |
3b1137fe DA |
3204 | /* send notification for routes that were added so that |
3205 | * the delete notifications sent by ip6_route_del are | |
3206 | * coherent | |
3207 | */ | |
3208 | if (rt_notif) | |
3209 | ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags); | |
3210 | ||
6b9ea5a6 RP |
3211 | /* Delete routes that were already added */ |
3212 | list_for_each_entry(nh, &rt6_nh_list, next) { | |
3213 | if (err_nh == nh) | |
3214 | break; | |
3215 | ip6_route_del(&nh->r_cfg); | |
3216 | } | |
3217 | ||
3218 | cleanup: | |
3219 | list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) { | |
3220 | if (nh->rt6_info) | |
3221 | dst_free(&nh->rt6_info->dst); | |
52fe51f8 | 3222 | kfree(nh->mxc.mx); |
6b9ea5a6 RP |
3223 | list_del(&nh->next); |
3224 | kfree(nh); | |
3225 | } | |
3226 | ||
3227 | return err; | |
3228 | } | |
3229 | ||
3230 | static int ip6_route_multipath_del(struct fib6_config *cfg) | |
3231 | { | |
3232 | struct fib6_config r_cfg; | |
3233 | struct rtnexthop *rtnh; | |
3234 | int remaining; | |
3235 | int attrlen; | |
3236 | int err = 1, last_err = 0; | |
3237 | ||
3238 | remaining = cfg->fc_mp_len; | |
3239 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
3240 | ||
3241 | /* Parse a Multipath Entry */ | |
3242 | while (rtnh_ok(rtnh, remaining)) { | |
3243 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
3244 | if (rtnh->rtnh_ifindex) | |
3245 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
3246 | ||
3247 | attrlen = rtnh_attrlen(rtnh); | |
3248 | if (attrlen > 0) { | |
3249 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
3250 | ||
3251 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
3252 | if (nla) { | |
3253 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
3254 | r_cfg.fc_flags |= RTF_GATEWAY; | |
3255 | } | |
3256 | } | |
3257 | err = ip6_route_del(&r_cfg); | |
3258 | if (err) | |
3259 | last_err = err; | |
3260 | ||
51ebd318 ND |
3261 | rtnh = rtnh_next(rtnh, &remaining); |
3262 | } | |
3263 | ||
3264 | return last_err; | |
3265 | } | |
3266 | ||
c21ef3e3 DA |
3267 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
3268 | struct netlink_ext_ack *extack) | |
1da177e4 | 3269 | { |
86872cb5 TG |
3270 | struct fib6_config cfg; |
3271 | int err; | |
1da177e4 | 3272 | |
86872cb5 TG |
3273 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3274 | if (err < 0) | |
3275 | return err; | |
3276 | ||
51ebd318 | 3277 | if (cfg.fc_mp) |
6b9ea5a6 | 3278 | return ip6_route_multipath_del(&cfg); |
0ae81335 DA |
3279 | else { |
3280 | cfg.fc_delete_all_nh = 1; | |
51ebd318 | 3281 | return ip6_route_del(&cfg); |
0ae81335 | 3282 | } |
1da177e4 LT |
3283 | } |
3284 | ||
c21ef3e3 DA |
3285 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
3286 | struct netlink_ext_ack *extack) | |
1da177e4 | 3287 | { |
86872cb5 TG |
3288 | struct fib6_config cfg; |
3289 | int err; | |
1da177e4 | 3290 | |
86872cb5 TG |
3291 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
3292 | if (err < 0) | |
3293 | return err; | |
3294 | ||
51ebd318 | 3295 | if (cfg.fc_mp) |
6b9ea5a6 | 3296 | return ip6_route_multipath_add(&cfg); |
51ebd318 ND |
3297 | else |
3298 | return ip6_route_add(&cfg); | |
1da177e4 LT |
3299 | } |
3300 | ||
beb1afac | 3301 | static size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f | 3302 | { |
beb1afac DA |
3303 | int nexthop_len = 0; |
3304 | ||
3305 | if (rt->rt6i_nsiblings) { | |
3306 | nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */ | |
3307 | + NLA_ALIGN(sizeof(struct rtnexthop)) | |
3308 | + nla_total_size(16) /* RTA_GATEWAY */ | |
beb1afac DA |
3309 | + lwtunnel_get_encap_size(rt->dst.lwtstate); |
3310 | ||
3311 | nexthop_len *= rt->rt6i_nsiblings; | |
3312 | } | |
3313 | ||
339bf98f TG |
3314 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
3315 | + nla_total_size(16) /* RTA_SRC */ | |
3316 | + nla_total_size(16) /* RTA_DST */ | |
3317 | + nla_total_size(16) /* RTA_GATEWAY */ | |
3318 | + nla_total_size(16) /* RTA_PREFSRC */ | |
3319 | + nla_total_size(4) /* RTA_TABLE */ | |
3320 | + nla_total_size(4) /* RTA_IIF */ | |
3321 | + nla_total_size(4) /* RTA_OIF */ | |
3322 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 3323 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 3324 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 3325 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 | 3326 | + nla_total_size(1) /* RTA_PREF */ |
beb1afac DA |
3327 | + lwtunnel_get_encap_size(rt->dst.lwtstate) |
3328 | + nexthop_len; | |
3329 | } | |
3330 | ||
3331 | static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt, | |
5be083ce | 3332 | unsigned int *flags, bool skip_oif) |
beb1afac DA |
3333 | { |
3334 | if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) { | |
3335 | *flags |= RTNH_F_LINKDOWN; | |
3336 | if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown) | |
3337 | *flags |= RTNH_F_DEAD; | |
3338 | } | |
3339 | ||
3340 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
3341 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) | |
3342 | goto nla_put_failure; | |
3343 | } | |
3344 | ||
5be083ce DA |
3345 | /* not needed for multipath encoding b/c it has a rtnexthop struct */ |
3346 | if (!skip_oif && rt->dst.dev && | |
beb1afac DA |
3347 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
3348 | goto nla_put_failure; | |
3349 | ||
3350 | if (rt->dst.lwtstate && | |
3351 | lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0) | |
3352 | goto nla_put_failure; | |
3353 | ||
3354 | return 0; | |
3355 | ||
3356 | nla_put_failure: | |
3357 | return -EMSGSIZE; | |
3358 | } | |
3359 | ||
5be083ce | 3360 | /* add multipath next hop */ |
beb1afac DA |
3361 | static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt) |
3362 | { | |
3363 | struct rtnexthop *rtnh; | |
3364 | unsigned int flags = 0; | |
3365 | ||
3366 | rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); | |
3367 | if (!rtnh) | |
3368 | goto nla_put_failure; | |
3369 | ||
3370 | rtnh->rtnh_hops = 0; | |
3371 | rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0; | |
3372 | ||
5be083ce | 3373 | if (rt6_nexthop_info(skb, rt, &flags, true) < 0) |
beb1afac DA |
3374 | goto nla_put_failure; |
3375 | ||
3376 | rtnh->rtnh_flags = flags; | |
3377 | ||
3378 | /* length of rtnetlink header + attributes */ | |
3379 | rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; | |
3380 | ||
3381 | return 0; | |
3382 | ||
3383 | nla_put_failure: | |
3384 | return -EMSGSIZE; | |
339bf98f TG |
3385 | } |
3386 | ||
191cd582 BH |
3387 | static int rt6_fill_node(struct net *net, |
3388 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 3389 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 3390 | int iif, int type, u32 portid, u32 seq, |
f8cfe2ce | 3391 | unsigned int flags) |
1da177e4 | 3392 | { |
4b32b5ad | 3393 | u32 metrics[RTAX_MAX]; |
1da177e4 | 3394 | struct rtmsg *rtm; |
2d7202bf | 3395 | struct nlmsghdr *nlh; |
e3703b3d | 3396 | long expires; |
9e762a4a | 3397 | u32 table; |
1da177e4 | 3398 | |
15e47304 | 3399 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 3400 | if (!nlh) |
26932566 | 3401 | return -EMSGSIZE; |
2d7202bf TG |
3402 | |
3403 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
3404 | rtm->rtm_family = AF_INET6; |
3405 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
3406 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
3407 | rtm->rtm_tos = 0; | |
c71099ac | 3408 | if (rt->rt6i_table) |
9e762a4a | 3409 | table = rt->rt6i_table->tb6_id; |
c71099ac | 3410 | else |
9e762a4a PM |
3411 | table = RT6_TABLE_UNSPEC; |
3412 | rtm->rtm_table = table; | |
c78679e8 DM |
3413 | if (nla_put_u32(skb, RTA_TABLE, table)) |
3414 | goto nla_put_failure; | |
ef2c7d7b ND |
3415 | if (rt->rt6i_flags & RTF_REJECT) { |
3416 | switch (rt->dst.error) { | |
3417 | case -EINVAL: | |
3418 | rtm->rtm_type = RTN_BLACKHOLE; | |
3419 | break; | |
3420 | case -EACCES: | |
3421 | rtm->rtm_type = RTN_PROHIBIT; | |
3422 | break; | |
b4949ab2 ND |
3423 | case -EAGAIN: |
3424 | rtm->rtm_type = RTN_THROW; | |
3425 | break; | |
ef2c7d7b ND |
3426 | default: |
3427 | rtm->rtm_type = RTN_UNREACHABLE; | |
3428 | break; | |
3429 | } | |
3430 | } | |
38308473 | 3431 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 3432 | rtm->rtm_type = RTN_LOCAL; |
4ee39733 DA |
3433 | else if (rt->rt6i_flags & RTF_ANYCAST) |
3434 | rtm->rtm_type = RTN_ANYCAST; | |
d1918542 | 3435 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
3436 | rtm->rtm_type = RTN_LOCAL; |
3437 | else | |
3438 | rtm->rtm_type = RTN_UNICAST; | |
3439 | rtm->rtm_flags = 0; | |
3440 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
3441 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 3442 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 3443 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
3444 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
3445 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
3446 | rtm->rtm_protocol = RTPROT_RA; | |
3447 | else | |
3448 | rtm->rtm_protocol = RTPROT_KERNEL; | |
3449 | } | |
1da177e4 | 3450 | |
38308473 | 3451 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
3452 | rtm->rtm_flags |= RTM_F_CLONED; |
3453 | ||
3454 | if (dst) { | |
930345ea | 3455 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 3456 | goto nla_put_failure; |
1ab1457c | 3457 | rtm->rtm_dst_len = 128; |
1da177e4 | 3458 | } else if (rtm->rtm_dst_len) |
930345ea | 3459 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 3460 | goto nla_put_failure; |
1da177e4 LT |
3461 | #ifdef CONFIG_IPV6_SUBTREES |
3462 | if (src) { | |
930345ea | 3463 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 3464 | goto nla_put_failure; |
1ab1457c | 3465 | rtm->rtm_src_len = 128; |
c78679e8 | 3466 | } else if (rtm->rtm_src_len && |
930345ea | 3467 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 3468 | goto nla_put_failure; |
1da177e4 | 3469 | #endif |
7bc570c8 YH |
3470 | if (iif) { |
3471 | #ifdef CONFIG_IPV6_MROUTE | |
3472 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
fd61c6ba DA |
3473 | int err = ip6mr_get_route(net, skb, rtm, portid); |
3474 | ||
3475 | if (err == 0) | |
3476 | return 0; | |
3477 | if (err < 0) | |
3478 | goto nla_put_failure; | |
7bc570c8 YH |
3479 | } else |
3480 | #endif | |
c78679e8 DM |
3481 | if (nla_put_u32(skb, RTA_IIF, iif)) |
3482 | goto nla_put_failure; | |
7bc570c8 | 3483 | } else if (dst) { |
1da177e4 | 3484 | struct in6_addr saddr_buf; |
c78679e8 | 3485 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 3486 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3487 | goto nla_put_failure; |
1da177e4 | 3488 | } |
2d7202bf | 3489 | |
c3968a85 DW |
3490 | if (rt->rt6i_prefsrc.plen) { |
3491 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 3492 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 3493 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 3494 | goto nla_put_failure; |
c3968a85 DW |
3495 | } |
3496 | ||
4b32b5ad MKL |
3497 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
3498 | if (rt->rt6i_pmtu) | |
3499 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
3500 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
3501 | goto nla_put_failure; |
3502 | ||
c78679e8 DM |
3503 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) |
3504 | goto nla_put_failure; | |
8253947e | 3505 | |
beb1afac DA |
3506 | /* For multipath routes, walk the siblings list and add |
3507 | * each as a nexthop within RTA_MULTIPATH. | |
3508 | */ | |
3509 | if (rt->rt6i_nsiblings) { | |
3510 | struct rt6_info *sibling, *next_sibling; | |
3511 | struct nlattr *mp; | |
3512 | ||
3513 | mp = nla_nest_start(skb, RTA_MULTIPATH); | |
3514 | if (!mp) | |
3515 | goto nla_put_failure; | |
3516 | ||
3517 | if (rt6_add_nexthop(skb, rt) < 0) | |
3518 | goto nla_put_failure; | |
3519 | ||
3520 | list_for_each_entry_safe(sibling, next_sibling, | |
3521 | &rt->rt6i_siblings, rt6i_siblings) { | |
3522 | if (rt6_add_nexthop(skb, sibling) < 0) | |
3523 | goto nla_put_failure; | |
3524 | } | |
3525 | ||
3526 | nla_nest_end(skb, mp); | |
3527 | } else { | |
5be083ce | 3528 | if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0) |
beb1afac DA |
3529 | goto nla_put_failure; |
3530 | } | |
3531 | ||
8253947e | 3532 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; |
69cdf8f9 | 3533 | |
87a50699 | 3534 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 3535 | goto nla_put_failure; |
2d7202bf | 3536 | |
c78ba6d6 LR |
3537 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
3538 | goto nla_put_failure; | |
3539 | ||
19e42e45 | 3540 | |
053c095a JB |
3541 | nlmsg_end(skb, nlh); |
3542 | return 0; | |
2d7202bf TG |
3543 | |
3544 | nla_put_failure: | |
26932566 PM |
3545 | nlmsg_cancel(skb, nlh); |
3546 | return -EMSGSIZE; | |
1da177e4 LT |
3547 | } |
3548 | ||
1b43af54 | 3549 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
3550 | { |
3551 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
1f17e2f2 DA |
3552 | struct net *net = arg->net; |
3553 | ||
3554 | if (rt == net->ipv6.ip6_null_entry) | |
3555 | return 0; | |
1da177e4 | 3556 | |
2d7202bf TG |
3557 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
3558 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
f8cfe2ce DA |
3559 | |
3560 | /* user wants prefix routes only */ | |
3561 | if (rtm->rtm_flags & RTM_F_PREFIX && | |
3562 | !(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
3563 | /* success since this is not a prefix route */ | |
3564 | return 1; | |
3565 | } | |
3566 | } | |
1da177e4 | 3567 | |
1f17e2f2 | 3568 | return rt6_fill_node(net, |
191cd582 | 3569 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, |
15e47304 | 3570 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
f8cfe2ce | 3571 | NLM_F_MULTI); |
1da177e4 LT |
3572 | } |
3573 | ||
c21ef3e3 DA |
3574 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
3575 | struct netlink_ext_ack *extack) | |
1da177e4 | 3576 | { |
3b1e0a65 | 3577 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
3578 | struct nlattr *tb[RTA_MAX+1]; |
3579 | struct rt6_info *rt; | |
1da177e4 | 3580 | struct sk_buff *skb; |
ab364a6f | 3581 | struct rtmsg *rtm; |
4c9483b2 | 3582 | struct flowi6 fl6; |
72331bc0 | 3583 | int err, iif = 0, oif = 0; |
1da177e4 | 3584 | |
fceb6435 | 3585 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy, |
c21ef3e3 | 3586 | extack); |
ab364a6f TG |
3587 | if (err < 0) |
3588 | goto errout; | |
1da177e4 | 3589 | |
ab364a6f | 3590 | err = -EINVAL; |
4c9483b2 | 3591 | memset(&fl6, 0, sizeof(fl6)); |
38b7097b HFS |
3592 | rtm = nlmsg_data(nlh); |
3593 | fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0); | |
1da177e4 | 3594 | |
ab364a6f TG |
3595 | if (tb[RTA_SRC]) { |
3596 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3597 | goto errout; | |
3598 | ||
4e3fd7a0 | 3599 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3600 | } |
3601 | ||
3602 | if (tb[RTA_DST]) { | |
3603 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3604 | goto errout; | |
3605 | ||
4e3fd7a0 | 3606 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3607 | } |
3608 | ||
3609 | if (tb[RTA_IIF]) | |
3610 | iif = nla_get_u32(tb[RTA_IIF]); | |
3611 | ||
3612 | if (tb[RTA_OIF]) | |
72331bc0 | 3613 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3614 | |
2e47b291 LC |
3615 | if (tb[RTA_MARK]) |
3616 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3617 | ||
622ec2c9 LC |
3618 | if (tb[RTA_UID]) |
3619 | fl6.flowi6_uid = make_kuid(current_user_ns(), | |
3620 | nla_get_u32(tb[RTA_UID])); | |
3621 | else | |
3622 | fl6.flowi6_uid = iif ? INVALID_UID : current_uid(); | |
3623 | ||
1da177e4 LT |
3624 | if (iif) { |
3625 | struct net_device *dev; | |
72331bc0 SL |
3626 | int flags = 0; |
3627 | ||
5578689a | 3628 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3629 | if (!dev) { |
3630 | err = -ENODEV; | |
ab364a6f | 3631 | goto errout; |
1da177e4 | 3632 | } |
72331bc0 SL |
3633 | |
3634 | fl6.flowi6_iif = iif; | |
3635 | ||
3636 | if (!ipv6_addr_any(&fl6.saddr)) | |
3637 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3638 | ||
3639 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3640 | flags); | |
3641 | } else { | |
3642 | fl6.flowi6_oif = oif; | |
3643 | ||
3644 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
3645 | } |
3646 | ||
9d6acb3b WC |
3647 | if (rt == net->ipv6.ip6_null_entry) { |
3648 | err = rt->dst.error; | |
3649 | ip6_rt_put(rt); | |
3650 | goto errout; | |
3651 | } | |
3652 | ||
ab364a6f | 3653 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3654 | if (!skb) { |
94e187c0 | 3655 | ip6_rt_put(rt); |
ab364a6f TG |
3656 | err = -ENOBUFS; |
3657 | goto errout; | |
3658 | } | |
1da177e4 | 3659 | |
d8d1f30b | 3660 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3661 | |
4c9483b2 | 3662 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3663 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
f8cfe2ce | 3664 | nlh->nlmsg_seq, 0); |
1da177e4 | 3665 | if (err < 0) { |
ab364a6f TG |
3666 | kfree_skb(skb); |
3667 | goto errout; | |
1da177e4 LT |
3668 | } |
3669 | ||
15e47304 | 3670 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3671 | errout: |
1da177e4 | 3672 | return err; |
1da177e4 LT |
3673 | } |
3674 | ||
37a1d361 RP |
3675 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info, |
3676 | unsigned int nlm_flags) | |
1da177e4 LT |
3677 | { |
3678 | struct sk_buff *skb; | |
5578689a | 3679 | struct net *net = info->nl_net; |
528c4ceb DL |
3680 | u32 seq; |
3681 | int err; | |
3682 | ||
3683 | err = -ENOBUFS; | |
38308473 | 3684 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3685 | |
19e42e45 | 3686 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3687 | if (!skb) |
21713ebc TG |
3688 | goto errout; |
3689 | ||
191cd582 | 3690 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
f8cfe2ce | 3691 | event, info->portid, seq, nlm_flags); |
26932566 PM |
3692 | if (err < 0) { |
3693 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3694 | WARN_ON(err == -EMSGSIZE); | |
3695 | kfree_skb(skb); | |
3696 | goto errout; | |
3697 | } | |
15e47304 | 3698 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3699 | info->nlh, gfp_any()); |
3700 | return; | |
21713ebc TG |
3701 | errout: |
3702 | if (err < 0) | |
5578689a | 3703 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3704 | } |
3705 | ||
8ed67789 | 3706 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3707 | unsigned long event, void *ptr) |
8ed67789 | 3708 | { |
351638e7 | 3709 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3710 | struct net *net = dev_net(dev); |
8ed67789 | 3711 | |
242d3a49 WC |
3712 | if (!(dev->flags & IFF_LOOPBACK)) |
3713 | return NOTIFY_OK; | |
3714 | ||
3715 | if (event == NETDEV_REGISTER) { | |
d8d1f30b | 3716 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3717 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3718 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3719 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3720 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3721 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 | 3722 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
242d3a49 WC |
3723 | #endif |
3724 | } else if (event == NETDEV_UNREGISTER) { | |
3725 | in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev); | |
3726 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3727 | in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev); | |
3728 | in6_dev_put(net->ipv6.ip6_blk_hole_entry->rt6i_idev); | |
8ed67789 DL |
3729 | #endif |
3730 | } | |
3731 | ||
3732 | return NOTIFY_OK; | |
3733 | } | |
3734 | ||
1da177e4 LT |
3735 | /* |
3736 | * /proc | |
3737 | */ | |
3738 | ||
3739 | #ifdef CONFIG_PROC_FS | |
3740 | ||
33120b30 AD |
3741 | static const struct file_operations ipv6_route_proc_fops = { |
3742 | .owner = THIS_MODULE, | |
3743 | .open = ipv6_route_open, | |
3744 | .read = seq_read, | |
3745 | .llseek = seq_lseek, | |
8d2ca1d7 | 3746 | .release = seq_release_net, |
33120b30 AD |
3747 | }; |
3748 | ||
1da177e4 LT |
3749 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3750 | { | |
69ddb805 | 3751 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3752 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3753 | net->ipv6.rt6_stats->fib_nodes, |
3754 | net->ipv6.rt6_stats->fib_route_nodes, | |
3755 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3756 | net->ipv6.rt6_stats->fib_rt_entries, | |
3757 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3758 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3759 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3760 | |
3761 | return 0; | |
3762 | } | |
3763 | ||
3764 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3765 | { | |
de05c557 | 3766 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3767 | } |
3768 | ||
9a32144e | 3769 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3770 | .owner = THIS_MODULE, |
3771 | .open = rt6_stats_seq_open, | |
3772 | .read = seq_read, | |
3773 | .llseek = seq_lseek, | |
b6fcbdb4 | 3774 | .release = single_release_net, |
1da177e4 LT |
3775 | }; |
3776 | #endif /* CONFIG_PROC_FS */ | |
3777 | ||
3778 | #ifdef CONFIG_SYSCTL | |
3779 | ||
1da177e4 | 3780 | static |
fe2c6338 | 3781 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3782 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3783 | { | |
c486da34 LAG |
3784 | struct net *net; |
3785 | int delay; | |
3786 | if (!write) | |
1da177e4 | 3787 | return -EINVAL; |
c486da34 LAG |
3788 | |
3789 | net = (struct net *)ctl->extra1; | |
3790 | delay = net->ipv6.sysctl.flush_delay; | |
3791 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3792 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3793 | return 0; |
1da177e4 LT |
3794 | } |
3795 | ||
fe2c6338 | 3796 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3797 | { |
1da177e4 | 3798 | .procname = "flush", |
4990509f | 3799 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3800 | .maxlen = sizeof(int), |
89c8b3a1 | 3801 | .mode = 0200, |
6d9f239a | 3802 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3803 | }, |
3804 | { | |
1da177e4 | 3805 | .procname = "gc_thresh", |
9a7ec3a9 | 3806 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3807 | .maxlen = sizeof(int), |
3808 | .mode = 0644, | |
6d9f239a | 3809 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3810 | }, |
3811 | { | |
1da177e4 | 3812 | .procname = "max_size", |
4990509f | 3813 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3814 | .maxlen = sizeof(int), |
3815 | .mode = 0644, | |
6d9f239a | 3816 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3817 | }, |
3818 | { | |
1da177e4 | 3819 | .procname = "gc_min_interval", |
4990509f | 3820 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3821 | .maxlen = sizeof(int), |
3822 | .mode = 0644, | |
6d9f239a | 3823 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3824 | }, |
3825 | { | |
1da177e4 | 3826 | .procname = "gc_timeout", |
4990509f | 3827 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3828 | .maxlen = sizeof(int), |
3829 | .mode = 0644, | |
6d9f239a | 3830 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3831 | }, |
3832 | { | |
1da177e4 | 3833 | .procname = "gc_interval", |
4990509f | 3834 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3835 | .maxlen = sizeof(int), |
3836 | .mode = 0644, | |
6d9f239a | 3837 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3838 | }, |
3839 | { | |
1da177e4 | 3840 | .procname = "gc_elasticity", |
4990509f | 3841 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3842 | .maxlen = sizeof(int), |
3843 | .mode = 0644, | |
f3d3f616 | 3844 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3845 | }, |
3846 | { | |
1da177e4 | 3847 | .procname = "mtu_expires", |
4990509f | 3848 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3849 | .maxlen = sizeof(int), |
3850 | .mode = 0644, | |
6d9f239a | 3851 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3852 | }, |
3853 | { | |
1da177e4 | 3854 | .procname = "min_adv_mss", |
4990509f | 3855 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3856 | .maxlen = sizeof(int), |
3857 | .mode = 0644, | |
f3d3f616 | 3858 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3859 | }, |
3860 | { | |
1da177e4 | 3861 | .procname = "gc_min_interval_ms", |
4990509f | 3862 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3863 | .maxlen = sizeof(int), |
3864 | .mode = 0644, | |
6d9f239a | 3865 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3866 | }, |
f8572d8f | 3867 | { } |
1da177e4 LT |
3868 | }; |
3869 | ||
2c8c1e72 | 3870 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3871 | { |
3872 | struct ctl_table *table; | |
3873 | ||
3874 | table = kmemdup(ipv6_route_table_template, | |
3875 | sizeof(ipv6_route_table_template), | |
3876 | GFP_KERNEL); | |
5ee09105 YH |
3877 | |
3878 | if (table) { | |
3879 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3880 | table[0].extra1 = net; |
86393e52 | 3881 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3882 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3883 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3884 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3885 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3886 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3887 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3888 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3889 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3890 | |
3891 | /* Don't export sysctls to unprivileged users */ | |
3892 | if (net->user_ns != &init_user_ns) | |
3893 | table[0].procname = NULL; | |
5ee09105 YH |
3894 | } |
3895 | ||
760f2d01 DL |
3896 | return table; |
3897 | } | |
1da177e4 LT |
3898 | #endif |
3899 | ||
2c8c1e72 | 3900 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3901 | { |
633d424b | 3902 | int ret = -ENOMEM; |
8ed67789 | 3903 | |
86393e52 AD |
3904 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3905 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3906 | |
fc66f95c ED |
3907 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3908 | goto out_ip6_dst_ops; | |
3909 | ||
8ed67789 DL |
3910 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3911 | sizeof(*net->ipv6.ip6_null_entry), | |
3912 | GFP_KERNEL); | |
3913 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3914 | goto out_ip6_dst_entries; |
d8d1f30b | 3915 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3916 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3917 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3918 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3919 | ip6_template_metrics, true); | |
8ed67789 DL |
3920 | |
3921 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3922 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3923 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3924 | GFP_KERNEL); | |
68fffc67 PZ |
3925 | if (!net->ipv6.ip6_prohibit_entry) |
3926 | goto out_ip6_null_entry; | |
d8d1f30b | 3927 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3928 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3929 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3930 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3931 | ip6_template_metrics, true); | |
8ed67789 DL |
3932 | |
3933 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3934 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3935 | GFP_KERNEL); | |
68fffc67 PZ |
3936 | if (!net->ipv6.ip6_blk_hole_entry) |
3937 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3938 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3939 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3940 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3941 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3942 | ip6_template_metrics, true); | |
8ed67789 DL |
3943 | #endif |
3944 | ||
b339a47c PZ |
3945 | net->ipv6.sysctl.flush_delay = 0; |
3946 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3947 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3948 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3949 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3950 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3951 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3952 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3953 | ||
6891a346 BT |
3954 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3955 | ||
8ed67789 DL |
3956 | ret = 0; |
3957 | out: | |
3958 | return ret; | |
f2fc6a54 | 3959 | |
68fffc67 PZ |
3960 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3961 | out_ip6_prohibit_entry: | |
3962 | kfree(net->ipv6.ip6_prohibit_entry); | |
3963 | out_ip6_null_entry: | |
3964 | kfree(net->ipv6.ip6_null_entry); | |
3965 | #endif | |
fc66f95c ED |
3966 | out_ip6_dst_entries: |
3967 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3968 | out_ip6_dst_ops: |
f2fc6a54 | 3969 | goto out; |
cdb18761 DL |
3970 | } |
3971 | ||
2c8c1e72 | 3972 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3973 | { |
8ed67789 DL |
3974 | kfree(net->ipv6.ip6_null_entry); |
3975 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3976 | kfree(net->ipv6.ip6_prohibit_entry); | |
3977 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3978 | #endif | |
41bb78b4 | 3979 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3980 | } |
3981 | ||
d189634e TG |
3982 | static int __net_init ip6_route_net_init_late(struct net *net) |
3983 | { | |
3984 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3985 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3986 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3987 | #endif |
3988 | return 0; | |
3989 | } | |
3990 | ||
3991 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3992 | { | |
3993 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3994 | remove_proc_entry("ipv6_route", net->proc_net); |
3995 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3996 | #endif |
3997 | } | |
3998 | ||
cdb18761 DL |
3999 | static struct pernet_operations ip6_route_net_ops = { |
4000 | .init = ip6_route_net_init, | |
4001 | .exit = ip6_route_net_exit, | |
4002 | }; | |
4003 | ||
c3426b47 DM |
4004 | static int __net_init ipv6_inetpeer_init(struct net *net) |
4005 | { | |
4006 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
4007 | ||
4008 | if (!bp) | |
4009 | return -ENOMEM; | |
4010 | inet_peer_base_init(bp); | |
4011 | net->ipv6.peers = bp; | |
4012 | return 0; | |
4013 | } | |
4014 | ||
4015 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
4016 | { | |
4017 | struct inet_peer_base *bp = net->ipv6.peers; | |
4018 | ||
4019 | net->ipv6.peers = NULL; | |
56a6b248 | 4020 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
4021 | kfree(bp); |
4022 | } | |
4023 | ||
2b823f72 | 4024 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
4025 | .init = ipv6_inetpeer_init, |
4026 | .exit = ipv6_inetpeer_exit, | |
4027 | }; | |
4028 | ||
d189634e TG |
4029 | static struct pernet_operations ip6_route_net_late_ops = { |
4030 | .init = ip6_route_net_init_late, | |
4031 | .exit = ip6_route_net_exit_late, | |
4032 | }; | |
4033 | ||
8ed67789 DL |
4034 | static struct notifier_block ip6_route_dev_notifier = { |
4035 | .notifier_call = ip6_route_dev_notify, | |
242d3a49 | 4036 | .priority = ADDRCONF_NOTIFY_PRIORITY - 10, |
8ed67789 DL |
4037 | }; |
4038 | ||
2f460933 WC |
4039 | void __init ip6_route_init_special_entries(void) |
4040 | { | |
4041 | /* Registering of the loopback is done before this portion of code, | |
4042 | * the loopback reference in rt6_info will not be taken, do it | |
4043 | * manually for init_net */ | |
4044 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; | |
4045 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4046 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
4047 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; | |
4048 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4049 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; | |
4050 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); | |
4051 | #endif | |
4052 | } | |
4053 | ||
433d49c3 | 4054 | int __init ip6_route_init(void) |
1da177e4 | 4055 | { |
433d49c3 | 4056 | int ret; |
8d0b94af | 4057 | int cpu; |
433d49c3 | 4058 | |
9a7ec3a9 DL |
4059 | ret = -ENOMEM; |
4060 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 4061 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 4062 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 4063 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 4064 | goto out; |
14e50e57 | 4065 | |
fc66f95c | 4066 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 4067 | if (ret) |
bdb3289f | 4068 | goto out_kmem_cache; |
bdb3289f | 4069 | |
c3426b47 DM |
4070 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
4071 | if (ret) | |
e8803b6c | 4072 | goto out_dst_entries; |
2a0c451a | 4073 | |
7e52b33b DM |
4074 | ret = register_pernet_subsys(&ip6_route_net_ops); |
4075 | if (ret) | |
4076 | goto out_register_inetpeer; | |
c3426b47 | 4077 | |
5dc121e9 AE |
4078 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
4079 | ||
e8803b6c | 4080 | ret = fib6_init(); |
433d49c3 | 4081 | if (ret) |
8ed67789 | 4082 | goto out_register_subsys; |
433d49c3 | 4083 | |
433d49c3 DL |
4084 | ret = xfrm6_init(); |
4085 | if (ret) | |
e8803b6c | 4086 | goto out_fib6_init; |
c35b7e72 | 4087 | |
433d49c3 DL |
4088 | ret = fib6_rules_init(); |
4089 | if (ret) | |
4090 | goto xfrm6_init; | |
7e5449c2 | 4091 | |
d189634e TG |
4092 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
4093 | if (ret) | |
4094 | goto fib6_rules_init; | |
4095 | ||
433d49c3 | 4096 | ret = -ENOBUFS; |
c7ac8679 GR |
4097 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
4098 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
4099 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 4100 | goto out_register_late_subsys; |
c127ea2c | 4101 | |
8ed67789 | 4102 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 4103 | if (ret) |
d189634e | 4104 | goto out_register_late_subsys; |
8ed67789 | 4105 | |
8d0b94af MKL |
4106 | for_each_possible_cpu(cpu) { |
4107 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
4108 | ||
4109 | INIT_LIST_HEAD(&ul->head); | |
4110 | spin_lock_init(&ul->lock); | |
4111 | } | |
4112 | ||
433d49c3 DL |
4113 | out: |
4114 | return ret; | |
4115 | ||
d189634e TG |
4116 | out_register_late_subsys: |
4117 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 4118 | fib6_rules_init: |
433d49c3 DL |
4119 | fib6_rules_cleanup(); |
4120 | xfrm6_init: | |
433d49c3 | 4121 | xfrm6_fini(); |
2a0c451a TG |
4122 | out_fib6_init: |
4123 | fib6_gc_cleanup(); | |
8ed67789 DL |
4124 | out_register_subsys: |
4125 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
4126 | out_register_inetpeer: |
4127 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
4128 | out_dst_entries: |
4129 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 4130 | out_kmem_cache: |
f2fc6a54 | 4131 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 4132 | goto out; |
1da177e4 LT |
4133 | } |
4134 | ||
4135 | void ip6_route_cleanup(void) | |
4136 | { | |
8ed67789 | 4137 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 4138 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 4139 | fib6_rules_cleanup(); |
1da177e4 | 4140 | xfrm6_fini(); |
1da177e4 | 4141 | fib6_gc_cleanup(); |
c3426b47 | 4142 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 4143 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 4144 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 4145 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 4146 | } |