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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> | |
57 | #include <net/xfrm.h> | |
8d71740c | 58 | #include <net/netevent.h> |
21713ebc | 59 | #include <net/netlink.h> |
51ebd318 | 60 | #include <net/nexthop.h> |
19e42e45 | 61 | #include <net/lwtunnel.h> |
1da177e4 LT |
62 | |
63 | #include <asm/uaccess.h> | |
64 | ||
65 | #ifdef CONFIG_SYSCTL | |
66 | #include <linux/sysctl.h> | |
67 | #endif | |
68 | ||
afc154e9 | 69 | enum rt6_nud_state { |
7e980569 JB |
70 | RT6_NUD_FAIL_HARD = -3, |
71 | RT6_NUD_FAIL_PROBE = -2, | |
72 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
73 | RT6_NUD_SUCCEED = 1 |
74 | }; | |
75 | ||
83a09abd | 76 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort); |
1da177e4 | 77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 78 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 79 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
80 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
81 | static void ip6_dst_destroy(struct dst_entry *); | |
82 | static void ip6_dst_ifdown(struct dst_entry *, | |
83 | struct net_device *dev, int how); | |
569d3645 | 84 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
85 | |
86 | static int ip6_pkt_discard(struct sk_buff *skb); | |
aad88724 | 87 | static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb); |
7150aede | 88 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
aad88724 | 89 | static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb); |
1da177e4 | 90 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
91 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
92 | struct sk_buff *skb, u32 mtu); | |
93 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
94 | struct sk_buff *skb); | |
4b32b5ad | 95 | static void rt6_dst_from_metrics_check(struct rt6_info *rt); |
52bd4c0c | 96 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 97 | |
70ceb4f5 | 98 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 99 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
100 | const struct in6_addr *prefix, int prefixlen, |
101 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 102 | unsigned int pref); |
efa2cea0 | 103 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
104 | const struct in6_addr *prefix, int prefixlen, |
105 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
106 | #endif |
107 | ||
8d0b94af MKL |
108 | struct uncached_list { |
109 | spinlock_t lock; | |
110 | struct list_head head; | |
111 | }; | |
112 | ||
113 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list); | |
114 | ||
115 | static void rt6_uncached_list_add(struct rt6_info *rt) | |
116 | { | |
117 | struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list); | |
118 | ||
119 | rt->dst.flags |= DST_NOCACHE; | |
120 | rt->rt6i_uncached_list = ul; | |
121 | ||
122 | spin_lock_bh(&ul->lock); | |
123 | list_add_tail(&rt->rt6i_uncached, &ul->head); | |
124 | spin_unlock_bh(&ul->lock); | |
125 | } | |
126 | ||
127 | static void rt6_uncached_list_del(struct rt6_info *rt) | |
128 | { | |
129 | if (!list_empty(&rt->rt6i_uncached)) { | |
130 | struct uncached_list *ul = rt->rt6i_uncached_list; | |
131 | ||
132 | spin_lock_bh(&ul->lock); | |
133 | list_del(&rt->rt6i_uncached); | |
134 | spin_unlock_bh(&ul->lock); | |
135 | } | |
136 | } | |
137 | ||
138 | static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) | |
139 | { | |
140 | struct net_device *loopback_dev = net->loopback_dev; | |
141 | int cpu; | |
142 | ||
143 | for_each_possible_cpu(cpu) { | |
144 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
145 | struct rt6_info *rt; | |
146 | ||
147 | spin_lock_bh(&ul->lock); | |
148 | list_for_each_entry(rt, &ul->head, rt6i_uncached) { | |
149 | struct inet6_dev *rt_idev = rt->rt6i_idev; | |
150 | struct net_device *rt_dev = rt->dst.dev; | |
151 | ||
152 | if (rt_idev && (rt_idev->dev == dev || !dev) && | |
153 | rt_idev->dev != loopback_dev) { | |
154 | rt->rt6i_idev = in6_dev_get(loopback_dev); | |
155 | in6_dev_put(rt_idev); | |
156 | } | |
157 | ||
158 | if (rt_dev && (rt_dev == dev || !dev) && | |
159 | rt_dev != loopback_dev) { | |
160 | rt->dst.dev = loopback_dev; | |
161 | dev_hold(rt->dst.dev); | |
162 | dev_put(rt_dev); | |
163 | } | |
164 | } | |
165 | spin_unlock_bh(&ul->lock); | |
166 | } | |
167 | } | |
168 | ||
d52d3997 MKL |
169 | static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt) |
170 | { | |
171 | return dst_metrics_write_ptr(rt->dst.from); | |
172 | } | |
173 | ||
06582540 DM |
174 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
175 | { | |
4b32b5ad | 176 | struct rt6_info *rt = (struct rt6_info *)dst; |
06582540 | 177 | |
d52d3997 MKL |
178 | if (rt->rt6i_flags & RTF_PCPU) |
179 | return rt6_pcpu_cow_metrics(rt); | |
180 | else if (rt->rt6i_flags & RTF_CACHE) | |
4b32b5ad MKL |
181 | return NULL; |
182 | else | |
3b471175 | 183 | return dst_cow_metrics_generic(dst, old); |
06582540 DM |
184 | } |
185 | ||
f894cbf8 DM |
186 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
187 | struct sk_buff *skb, | |
188 | const void *daddr) | |
39232973 DM |
189 | { |
190 | struct in6_addr *p = &rt->rt6i_gateway; | |
191 | ||
a7563f34 | 192 | if (!ipv6_addr_any(p)) |
39232973 | 193 | return (const void *) p; |
f894cbf8 DM |
194 | else if (skb) |
195 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
196 | return daddr; |
197 | } | |
198 | ||
f894cbf8 DM |
199 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
200 | struct sk_buff *skb, | |
201 | const void *daddr) | |
d3aaeb38 | 202 | { |
39232973 DM |
203 | struct rt6_info *rt = (struct rt6_info *) dst; |
204 | struct neighbour *n; | |
205 | ||
f894cbf8 | 206 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 207 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
208 | if (n) |
209 | return n; | |
210 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
211 | } | |
212 | ||
9a7ec3a9 | 213 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 214 | .family = AF_INET6, |
1da177e4 LT |
215 | .gc = ip6_dst_gc, |
216 | .gc_thresh = 1024, | |
217 | .check = ip6_dst_check, | |
0dbaee3b | 218 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 219 | .mtu = ip6_mtu, |
06582540 | 220 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
221 | .destroy = ip6_dst_destroy, |
222 | .ifdown = ip6_dst_ifdown, | |
223 | .negative_advice = ip6_negative_advice, | |
224 | .link_failure = ip6_link_failure, | |
225 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 226 | .redirect = rt6_do_redirect, |
1ac06e03 | 227 | .local_out = __ip6_local_out, |
d3aaeb38 | 228 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
229 | }; |
230 | ||
ebb762f2 | 231 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 232 | { |
618f9bc7 SK |
233 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
234 | ||
235 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
236 | } |
237 | ||
6700c270 DM |
238 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
239 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
240 | { |
241 | } | |
242 | ||
6700c270 DM |
243 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
244 | struct sk_buff *skb) | |
b587ee3b DM |
245 | { |
246 | } | |
247 | ||
0972ddb2 HB |
248 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
249 | unsigned long old) | |
250 | { | |
251 | return NULL; | |
252 | } | |
253 | ||
14e50e57 DM |
254 | static struct dst_ops ip6_dst_blackhole_ops = { |
255 | .family = AF_INET6, | |
14e50e57 DM |
256 | .destroy = ip6_dst_destroy, |
257 | .check = ip6_dst_check, | |
ebb762f2 | 258 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 259 | .default_advmss = ip6_default_advmss, |
14e50e57 | 260 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 261 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 262 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 263 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
264 | }; |
265 | ||
62fa8a84 | 266 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 267 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
268 | }; |
269 | ||
fb0af4c7 | 270 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
271 | .dst = { |
272 | .__refcnt = ATOMIC_INIT(1), | |
273 | .__use = 1, | |
2c20cbd7 | 274 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 275 | .error = -ENETUNREACH, |
d8d1f30b CG |
276 | .input = ip6_pkt_discard, |
277 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
278 | }, |
279 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 280 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
281 | .rt6i_metric = ~(u32) 0, |
282 | .rt6i_ref = ATOMIC_INIT(1), | |
283 | }; | |
284 | ||
101367c2 TG |
285 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
286 | ||
fb0af4c7 | 287 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
288 | .dst = { |
289 | .__refcnt = ATOMIC_INIT(1), | |
290 | .__use = 1, | |
2c20cbd7 | 291 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 292 | .error = -EACCES, |
d8d1f30b CG |
293 | .input = ip6_pkt_prohibit, |
294 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
295 | }, |
296 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 297 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
298 | .rt6i_metric = ~(u32) 0, |
299 | .rt6i_ref = ATOMIC_INIT(1), | |
300 | }; | |
301 | ||
fb0af4c7 | 302 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
303 | .dst = { |
304 | .__refcnt = ATOMIC_INIT(1), | |
305 | .__use = 1, | |
2c20cbd7 | 306 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 307 | .error = -EINVAL, |
d8d1f30b | 308 | .input = dst_discard, |
aad88724 | 309 | .output = dst_discard_sk, |
101367c2 TG |
310 | }, |
311 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 312 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
313 | .rt6i_metric = ~(u32) 0, |
314 | .rt6i_ref = ATOMIC_INIT(1), | |
315 | }; | |
316 | ||
317 | #endif | |
318 | ||
1da177e4 | 319 | /* allocate dst with ip6_dst_ops */ |
d52d3997 MKL |
320 | static struct rt6_info *__ip6_dst_alloc(struct net *net, |
321 | struct net_device *dev, | |
322 | int flags, | |
323 | struct fib6_table *table) | |
1da177e4 | 324 | { |
97bab73f | 325 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 326 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 327 | |
97bab73f | 328 | if (rt) { |
8104891b SK |
329 | struct dst_entry *dst = &rt->dst; |
330 | ||
331 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
51ebd318 | 332 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
8d0b94af | 333 | INIT_LIST_HEAD(&rt->rt6i_uncached); |
97bab73f | 334 | } |
cf911662 | 335 | return rt; |
1da177e4 LT |
336 | } |
337 | ||
d52d3997 MKL |
338 | static struct rt6_info *ip6_dst_alloc(struct net *net, |
339 | struct net_device *dev, | |
340 | int flags, | |
341 | struct fib6_table *table) | |
342 | { | |
343 | struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags, table); | |
344 | ||
345 | if (rt) { | |
346 | rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC); | |
347 | if (rt->rt6i_pcpu) { | |
348 | int cpu; | |
349 | ||
350 | for_each_possible_cpu(cpu) { | |
351 | struct rt6_info **p; | |
352 | ||
353 | p = per_cpu_ptr(rt->rt6i_pcpu, cpu); | |
354 | /* no one shares rt */ | |
355 | *p = NULL; | |
356 | } | |
357 | } else { | |
358 | dst_destroy((struct dst_entry *)rt); | |
359 | return NULL; | |
360 | } | |
361 | } | |
362 | ||
363 | return rt; | |
364 | } | |
365 | ||
1da177e4 LT |
366 | static void ip6_dst_destroy(struct dst_entry *dst) |
367 | { | |
368 | struct rt6_info *rt = (struct rt6_info *)dst; | |
ecd98837 | 369 | struct dst_entry *from = dst->from; |
8d0b94af | 370 | struct inet6_dev *idev; |
1da177e4 | 371 | |
4b32b5ad | 372 | dst_destroy_metrics_generic(dst); |
87775312 | 373 | free_percpu(rt->rt6i_pcpu); |
8d0b94af MKL |
374 | rt6_uncached_list_del(rt); |
375 | ||
376 | idev = rt->rt6i_idev; | |
38308473 | 377 | if (idev) { |
1da177e4 LT |
378 | rt->rt6i_idev = NULL; |
379 | in6_dev_put(idev); | |
1ab1457c | 380 | } |
1716a961 | 381 | |
ecd98837 YH |
382 | dst->from = NULL; |
383 | dst_release(from); | |
b3419363 DM |
384 | } |
385 | ||
1da177e4 LT |
386 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
387 | int how) | |
388 | { | |
389 | struct rt6_info *rt = (struct rt6_info *)dst; | |
390 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 391 | struct net_device *loopback_dev = |
c346dca1 | 392 | dev_net(dev)->loopback_dev; |
1da177e4 | 393 | |
97cac082 DM |
394 | if (dev != loopback_dev) { |
395 | if (idev && idev->dev == dev) { | |
396 | struct inet6_dev *loopback_idev = | |
397 | in6_dev_get(loopback_dev); | |
398 | if (loopback_idev) { | |
399 | rt->rt6i_idev = loopback_idev; | |
400 | in6_dev_put(idev); | |
401 | } | |
402 | } | |
1da177e4 LT |
403 | } |
404 | } | |
405 | ||
a50feda5 | 406 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 407 | { |
1716a961 G |
408 | if (rt->rt6i_flags & RTF_EXPIRES) { |
409 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 410 | return true; |
1716a961 | 411 | } else if (rt->dst.from) { |
3fd91fb3 | 412 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 413 | } |
a50feda5 | 414 | return false; |
1da177e4 LT |
415 | } |
416 | ||
51ebd318 ND |
417 | /* Multipath route selection: |
418 | * Hash based function using packet header and flowlabel. | |
419 | * Adapted from fib_info_hashfn() | |
420 | */ | |
421 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
422 | const struct flowi6 *fl6) | |
423 | { | |
424 | unsigned int val = fl6->flowi6_proto; | |
425 | ||
c08977bb YH |
426 | val ^= ipv6_addr_hash(&fl6->daddr); |
427 | val ^= ipv6_addr_hash(&fl6->saddr); | |
51ebd318 ND |
428 | |
429 | /* Work only if this not encapsulated */ | |
430 | switch (fl6->flowi6_proto) { | |
431 | case IPPROTO_UDP: | |
432 | case IPPROTO_TCP: | |
433 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
434 | val ^= (__force u16)fl6->fl6_sport; |
435 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
436 | break; |
437 | ||
438 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
439 | val ^= (__force u16)fl6->fl6_icmp_type; |
440 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
441 | break; |
442 | } | |
443 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 444 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
445 | |
446 | /* Perhaps, we need to tune, this function? */ | |
447 | val = val ^ (val >> 7) ^ (val >> 12); | |
448 | return val % candidate_count; | |
449 | } | |
450 | ||
451 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
452 | struct flowi6 *fl6, int oif, |
453 | int strict) | |
51ebd318 ND |
454 | { |
455 | struct rt6_info *sibling, *next_sibling; | |
456 | int route_choosen; | |
457 | ||
458 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
459 | /* Don't change the route, if route_choosen == 0 | |
460 | * (siblings does not include ourself) | |
461 | */ | |
462 | if (route_choosen) | |
463 | list_for_each_entry_safe(sibling, next_sibling, | |
464 | &match->rt6i_siblings, rt6i_siblings) { | |
465 | route_choosen--; | |
466 | if (route_choosen == 0) { | |
52bd4c0c ND |
467 | if (rt6_score_route(sibling, oif, strict) < 0) |
468 | break; | |
51ebd318 ND |
469 | match = sibling; |
470 | break; | |
471 | } | |
472 | } | |
473 | return match; | |
474 | } | |
475 | ||
1da177e4 | 476 | /* |
c71099ac | 477 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
478 | */ |
479 | ||
8ed67789 DL |
480 | static inline struct rt6_info *rt6_device_match(struct net *net, |
481 | struct rt6_info *rt, | |
b71d1d42 | 482 | const struct in6_addr *saddr, |
1da177e4 | 483 | int oif, |
d420895e | 484 | int flags) |
1da177e4 LT |
485 | { |
486 | struct rt6_info *local = NULL; | |
487 | struct rt6_info *sprt; | |
488 | ||
dd3abc4e YH |
489 | if (!oif && ipv6_addr_any(saddr)) |
490 | goto out; | |
491 | ||
d8d1f30b | 492 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 493 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
494 | |
495 | if (oif) { | |
1da177e4 LT |
496 | if (dev->ifindex == oif) |
497 | return sprt; | |
498 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 499 | if (!sprt->rt6i_idev || |
1da177e4 | 500 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 501 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 502 | continue; |
1ab1457c | 503 | if (local && (!oif || |
1da177e4 LT |
504 | local->rt6i_idev->dev->ifindex == oif)) |
505 | continue; | |
506 | } | |
507 | local = sprt; | |
508 | } | |
dd3abc4e YH |
509 | } else { |
510 | if (ipv6_chk_addr(net, saddr, dev, | |
511 | flags & RT6_LOOKUP_F_IFACE)) | |
512 | return sprt; | |
1da177e4 | 513 | } |
dd3abc4e | 514 | } |
1da177e4 | 515 | |
dd3abc4e | 516 | if (oif) { |
1da177e4 LT |
517 | if (local) |
518 | return local; | |
519 | ||
d420895e | 520 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 521 | return net->ipv6.ip6_null_entry; |
1da177e4 | 522 | } |
dd3abc4e | 523 | out: |
1da177e4 LT |
524 | return rt; |
525 | } | |
526 | ||
27097255 | 527 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
528 | struct __rt6_probe_work { |
529 | struct work_struct work; | |
530 | struct in6_addr target; | |
531 | struct net_device *dev; | |
532 | }; | |
533 | ||
534 | static void rt6_probe_deferred(struct work_struct *w) | |
535 | { | |
536 | struct in6_addr mcaddr; | |
537 | struct __rt6_probe_work *work = | |
538 | container_of(w, struct __rt6_probe_work, work); | |
539 | ||
540 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
541 | ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); | |
542 | dev_put(work->dev); | |
662f5533 | 543 | kfree(work); |
c2f17e82 HFS |
544 | } |
545 | ||
27097255 YH |
546 | static void rt6_probe(struct rt6_info *rt) |
547 | { | |
990edb42 | 548 | struct __rt6_probe_work *work; |
f2c31e32 | 549 | struct neighbour *neigh; |
27097255 YH |
550 | /* |
551 | * Okay, this does not seem to be appropriate | |
552 | * for now, however, we need to check if it | |
553 | * is really so; aka Router Reachability Probing. | |
554 | * | |
555 | * Router Reachability Probe MUST be rate-limited | |
556 | * to no more than one per minute. | |
557 | */ | |
2152caea | 558 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 559 | return; |
2152caea YH |
560 | rcu_read_lock_bh(); |
561 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
562 | if (neigh) { | |
990edb42 | 563 | work = NULL; |
2152caea | 564 | write_lock(&neigh->lock); |
990edb42 MKL |
565 | if (!(neigh->nud_state & NUD_VALID) && |
566 | time_after(jiffies, | |
567 | neigh->updated + | |
568 | rt->rt6i_idev->cnf.rtr_probe_interval)) { | |
569 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
570 | if (work) | |
571 | __neigh_set_probe_once(neigh); | |
c2f17e82 | 572 | } |
2152caea | 573 | write_unlock(&neigh->lock); |
990edb42 MKL |
574 | } else { |
575 | work = kmalloc(sizeof(*work), GFP_ATOMIC); | |
f2c31e32 | 576 | } |
990edb42 MKL |
577 | |
578 | if (work) { | |
579 | INIT_WORK(&work->work, rt6_probe_deferred); | |
580 | work->target = rt->rt6i_gateway; | |
581 | dev_hold(rt->dst.dev); | |
582 | work->dev = rt->dst.dev; | |
583 | schedule_work(&work->work); | |
584 | } | |
585 | ||
2152caea | 586 | rcu_read_unlock_bh(); |
27097255 YH |
587 | } |
588 | #else | |
589 | static inline void rt6_probe(struct rt6_info *rt) | |
590 | { | |
27097255 YH |
591 | } |
592 | #endif | |
593 | ||
1da177e4 | 594 | /* |
554cfb7e | 595 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 596 | */ |
b6f99a21 | 597 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 598 | { |
d1918542 | 599 | struct net_device *dev = rt->dst.dev; |
161980f4 | 600 | if (!oif || dev->ifindex == oif) |
554cfb7e | 601 | return 2; |
161980f4 DM |
602 | if ((dev->flags & IFF_LOOPBACK) && |
603 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
604 | return 1; | |
605 | return 0; | |
554cfb7e | 606 | } |
1da177e4 | 607 | |
afc154e9 | 608 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 609 | { |
f2c31e32 | 610 | struct neighbour *neigh; |
afc154e9 | 611 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 612 | |
4d0c5911 YH |
613 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
614 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 615 | return RT6_NUD_SUCCEED; |
145a3621 YH |
616 | |
617 | rcu_read_lock_bh(); | |
618 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
619 | if (neigh) { | |
620 | read_lock(&neigh->lock); | |
554cfb7e | 621 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 622 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 623 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 624 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 625 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
626 | else |
627 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 628 | #endif |
145a3621 | 629 | read_unlock(&neigh->lock); |
afc154e9 HFS |
630 | } else { |
631 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 632 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 633 | } |
145a3621 YH |
634 | rcu_read_unlock_bh(); |
635 | ||
a5a81f0b | 636 | return ret; |
1da177e4 LT |
637 | } |
638 | ||
554cfb7e YH |
639 | static int rt6_score_route(struct rt6_info *rt, int oif, |
640 | int strict) | |
1da177e4 | 641 | { |
a5a81f0b | 642 | int m; |
1ab1457c | 643 | |
4d0c5911 | 644 | m = rt6_check_dev(rt, oif); |
77d16f45 | 645 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 646 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
647 | #ifdef CONFIG_IPV6_ROUTER_PREF |
648 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
649 | #endif | |
afc154e9 HFS |
650 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
651 | int n = rt6_check_neigh(rt); | |
652 | if (n < 0) | |
653 | return n; | |
654 | } | |
554cfb7e YH |
655 | return m; |
656 | } | |
657 | ||
f11e6659 | 658 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
659 | int *mpri, struct rt6_info *match, |
660 | bool *do_rr) | |
554cfb7e | 661 | { |
f11e6659 | 662 | int m; |
afc154e9 | 663 | bool match_do_rr = false; |
f11e6659 DM |
664 | |
665 | if (rt6_check_expired(rt)) | |
666 | goto out; | |
667 | ||
668 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 669 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
670 | match_do_rr = true; |
671 | m = 0; /* lowest valid score */ | |
7e980569 | 672 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 673 | goto out; |
afc154e9 HFS |
674 | } |
675 | ||
676 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
677 | rt6_probe(rt); | |
f11e6659 | 678 | |
7e980569 | 679 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 680 | if (m > *mpri) { |
afc154e9 | 681 | *do_rr = match_do_rr; |
f11e6659 DM |
682 | *mpri = m; |
683 | match = rt; | |
f11e6659 | 684 | } |
f11e6659 DM |
685 | out: |
686 | return match; | |
687 | } | |
688 | ||
689 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
690 | struct rt6_info *rr_head, | |
afc154e9 HFS |
691 | u32 metric, int oif, int strict, |
692 | bool *do_rr) | |
f11e6659 | 693 | { |
9fbdcfaf | 694 | struct rt6_info *rt, *match, *cont; |
554cfb7e | 695 | int mpri = -1; |
1da177e4 | 696 | |
f11e6659 | 697 | match = NULL; |
9fbdcfaf SK |
698 | cont = NULL; |
699 | for (rt = rr_head; rt; rt = rt->dst.rt6_next) { | |
700 | if (rt->rt6i_metric != metric) { | |
701 | cont = rt; | |
702 | break; | |
703 | } | |
704 | ||
705 | match = find_match(rt, oif, strict, &mpri, match, do_rr); | |
706 | } | |
707 | ||
708 | for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) { | |
709 | if (rt->rt6i_metric != metric) { | |
710 | cont = rt; | |
711 | break; | |
712 | } | |
713 | ||
afc154e9 | 714 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
9fbdcfaf SK |
715 | } |
716 | ||
717 | if (match || !cont) | |
718 | return match; | |
719 | ||
720 | for (rt = cont; rt; rt = rt->dst.rt6_next) | |
afc154e9 | 721 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 722 | |
f11e6659 DM |
723 | return match; |
724 | } | |
1da177e4 | 725 | |
f11e6659 DM |
726 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
727 | { | |
728 | struct rt6_info *match, *rt0; | |
8ed67789 | 729 | struct net *net; |
afc154e9 | 730 | bool do_rr = false; |
1da177e4 | 731 | |
f11e6659 DM |
732 | rt0 = fn->rr_ptr; |
733 | if (!rt0) | |
734 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 735 | |
afc154e9 HFS |
736 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
737 | &do_rr); | |
1da177e4 | 738 | |
afc154e9 | 739 | if (do_rr) { |
d8d1f30b | 740 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 741 | |
554cfb7e | 742 | /* no entries matched; do round-robin */ |
f11e6659 DM |
743 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
744 | next = fn->leaf; | |
745 | ||
746 | if (next != rt0) | |
747 | fn->rr_ptr = next; | |
1da177e4 | 748 | } |
1da177e4 | 749 | |
d1918542 | 750 | net = dev_net(rt0->dst.dev); |
a02cec21 | 751 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
752 | } |
753 | ||
8b9df265 MKL |
754 | static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt) |
755 | { | |
756 | return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)); | |
757 | } | |
758 | ||
70ceb4f5 YH |
759 | #ifdef CONFIG_IPV6_ROUTE_INFO |
760 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 761 | const struct in6_addr *gwaddr) |
70ceb4f5 | 762 | { |
c346dca1 | 763 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
764 | struct route_info *rinfo = (struct route_info *) opt; |
765 | struct in6_addr prefix_buf, *prefix; | |
766 | unsigned int pref; | |
4bed72e4 | 767 | unsigned long lifetime; |
70ceb4f5 YH |
768 | struct rt6_info *rt; |
769 | ||
770 | if (len < sizeof(struct route_info)) { | |
771 | return -EINVAL; | |
772 | } | |
773 | ||
774 | /* Sanity check for prefix_len and length */ | |
775 | if (rinfo->length > 3) { | |
776 | return -EINVAL; | |
777 | } else if (rinfo->prefix_len > 128) { | |
778 | return -EINVAL; | |
779 | } else if (rinfo->prefix_len > 64) { | |
780 | if (rinfo->length < 2) { | |
781 | return -EINVAL; | |
782 | } | |
783 | } else if (rinfo->prefix_len > 0) { | |
784 | if (rinfo->length < 1) { | |
785 | return -EINVAL; | |
786 | } | |
787 | } | |
788 | ||
789 | pref = rinfo->route_pref; | |
790 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 791 | return -EINVAL; |
70ceb4f5 | 792 | |
4bed72e4 | 793 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
794 | |
795 | if (rinfo->length == 3) | |
796 | prefix = (struct in6_addr *)rinfo->prefix; | |
797 | else { | |
798 | /* this function is safe */ | |
799 | ipv6_addr_prefix(&prefix_buf, | |
800 | (struct in6_addr *)rinfo->prefix, | |
801 | rinfo->prefix_len); | |
802 | prefix = &prefix_buf; | |
803 | } | |
804 | ||
f104a567 DJ |
805 | if (rinfo->prefix_len == 0) |
806 | rt = rt6_get_dflt_router(gwaddr, dev); | |
807 | else | |
808 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
809 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
810 | |
811 | if (rt && !lifetime) { | |
e0a1ad73 | 812 | ip6_del_rt(rt); |
70ceb4f5 YH |
813 | rt = NULL; |
814 | } | |
815 | ||
816 | if (!rt && lifetime) | |
efa2cea0 | 817 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
818 | pref); |
819 | else if (rt) | |
820 | rt->rt6i_flags = RTF_ROUTEINFO | | |
821 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
822 | ||
823 | if (rt) { | |
1716a961 G |
824 | if (!addrconf_finite_timeout(lifetime)) |
825 | rt6_clean_expires(rt); | |
826 | else | |
827 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
828 | ||
94e187c0 | 829 | ip6_rt_put(rt); |
70ceb4f5 YH |
830 | } |
831 | return 0; | |
832 | } | |
833 | #endif | |
834 | ||
a3c00e46 MKL |
835 | static struct fib6_node* fib6_backtrack(struct fib6_node *fn, |
836 | struct in6_addr *saddr) | |
837 | { | |
838 | struct fib6_node *pn; | |
839 | while (1) { | |
840 | if (fn->fn_flags & RTN_TL_ROOT) | |
841 | return NULL; | |
842 | pn = fn->parent; | |
843 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) | |
844 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); | |
845 | else | |
846 | fn = pn; | |
847 | if (fn->fn_flags & RTN_RTINFO) | |
848 | return fn; | |
849 | } | |
850 | } | |
c71099ac | 851 | |
8ed67789 DL |
852 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
853 | struct fib6_table *table, | |
4c9483b2 | 854 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
855 | { |
856 | struct fib6_node *fn; | |
857 | struct rt6_info *rt; | |
858 | ||
c71099ac | 859 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 860 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
861 | restart: |
862 | rt = fn->leaf; | |
4c9483b2 | 863 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 864 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 865 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
a3c00e46 MKL |
866 | if (rt == net->ipv6.ip6_null_entry) { |
867 | fn = fib6_backtrack(fn, &fl6->saddr); | |
868 | if (fn) | |
869 | goto restart; | |
870 | } | |
d8d1f30b | 871 | dst_use(&rt->dst, jiffies); |
c71099ac | 872 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
873 | return rt; |
874 | ||
875 | } | |
876 | ||
67ba4152 | 877 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
ea6e574e FW |
878 | int flags) |
879 | { | |
880 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
881 | } | |
882 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
883 | ||
9acd9f3a YH |
884 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
885 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 886 | { |
4c9483b2 DM |
887 | struct flowi6 fl6 = { |
888 | .flowi6_oif = oif, | |
889 | .daddr = *daddr, | |
c71099ac TG |
890 | }; |
891 | struct dst_entry *dst; | |
77d16f45 | 892 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 893 | |
adaa70bb | 894 | if (saddr) { |
4c9483b2 | 895 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
896 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
897 | } | |
898 | ||
4c9483b2 | 899 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
900 | if (dst->error == 0) |
901 | return (struct rt6_info *) dst; | |
902 | ||
903 | dst_release(dst); | |
904 | ||
1da177e4 LT |
905 | return NULL; |
906 | } | |
7159039a YH |
907 | EXPORT_SYMBOL(rt6_lookup); |
908 | ||
c71099ac | 909 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
910 | It takes new route entry, the addition fails by any reason the |
911 | route is freed. In any case, if caller does not hold it, it may | |
912 | be destroyed. | |
913 | */ | |
914 | ||
e5fd387a | 915 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, |
e715b6d3 | 916 | struct mx6_config *mxc) |
1da177e4 LT |
917 | { |
918 | int err; | |
c71099ac | 919 | struct fib6_table *table; |
1da177e4 | 920 | |
c71099ac TG |
921 | table = rt->rt6i_table; |
922 | write_lock_bh(&table->tb6_lock); | |
e715b6d3 | 923 | err = fib6_add(&table->tb6_root, rt, info, mxc); |
c71099ac | 924 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
925 | |
926 | return err; | |
927 | } | |
928 | ||
40e22e8f TG |
929 | int ip6_ins_rt(struct rt6_info *rt) |
930 | { | |
e715b6d3 FW |
931 | struct nl_info info = { .nl_net = dev_net(rt->dst.dev), }; |
932 | struct mx6_config mxc = { .mx = NULL, }; | |
933 | ||
934 | return __ip6_ins_rt(rt, &info, &mxc); | |
40e22e8f TG |
935 | } |
936 | ||
8b9df265 MKL |
937 | static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort, |
938 | const struct in6_addr *daddr, | |
939 | const struct in6_addr *saddr) | |
1da177e4 | 940 | { |
1da177e4 LT |
941 | struct rt6_info *rt; |
942 | ||
943 | /* | |
944 | * Clone the route. | |
945 | */ | |
946 | ||
d52d3997 | 947 | if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU)) |
83a09abd | 948 | ort = (struct rt6_info *)ort->dst.from; |
1da177e4 | 949 | |
d52d3997 MKL |
950 | rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, |
951 | 0, ort->rt6i_table); | |
83a09abd MKL |
952 | |
953 | if (!rt) | |
954 | return NULL; | |
955 | ||
956 | ip6_rt_copy_init(rt, ort); | |
957 | rt->rt6i_flags |= RTF_CACHE; | |
958 | rt->rt6i_metric = 0; | |
959 | rt->dst.flags |= DST_HOST; | |
960 | rt->rt6i_dst.addr = *daddr; | |
961 | rt->rt6i_dst.plen = 128; | |
1da177e4 | 962 | |
83a09abd MKL |
963 | if (!rt6_is_gw_or_nonexthop(ort)) { |
964 | if (ort->rt6i_dst.plen != 128 && | |
965 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
966 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 967 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd MKL |
968 | if (rt->rt6i_src.plen && saddr) { |
969 | rt->rt6i_src.addr = *saddr; | |
970 | rt->rt6i_src.plen = 128; | |
8b9df265 | 971 | } |
83a09abd | 972 | #endif |
95a9a5ba | 973 | } |
1da177e4 | 974 | |
95a9a5ba YH |
975 | return rt; |
976 | } | |
1da177e4 | 977 | |
d52d3997 MKL |
978 | static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt) |
979 | { | |
980 | struct rt6_info *pcpu_rt; | |
981 | ||
982 | pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev), | |
983 | rt->dst.dev, rt->dst.flags, | |
984 | rt->rt6i_table); | |
985 | ||
986 | if (!pcpu_rt) | |
987 | return NULL; | |
988 | ip6_rt_copy_init(pcpu_rt, rt); | |
989 | pcpu_rt->rt6i_protocol = rt->rt6i_protocol; | |
990 | pcpu_rt->rt6i_flags |= RTF_PCPU; | |
991 | return pcpu_rt; | |
992 | } | |
993 | ||
994 | /* It should be called with read_lock_bh(&tb6_lock) acquired */ | |
995 | static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt) | |
996 | { | |
997 | struct rt6_info *pcpu_rt, *prev, **p; | |
998 | ||
999 | p = this_cpu_ptr(rt->rt6i_pcpu); | |
1000 | pcpu_rt = *p; | |
1001 | ||
1002 | if (pcpu_rt) | |
1003 | goto done; | |
1004 | ||
1005 | pcpu_rt = ip6_rt_pcpu_alloc(rt); | |
1006 | if (!pcpu_rt) { | |
1007 | struct net *net = dev_net(rt->dst.dev); | |
1008 | ||
1009 | pcpu_rt = net->ipv6.ip6_null_entry; | |
1010 | goto done; | |
1011 | } | |
1012 | ||
1013 | prev = cmpxchg(p, NULL, pcpu_rt); | |
1014 | if (prev) { | |
1015 | /* If someone did it before us, return prev instead */ | |
1016 | dst_destroy(&pcpu_rt->dst); | |
1017 | pcpu_rt = prev; | |
1018 | } | |
1019 | ||
1020 | done: | |
1021 | dst_hold(&pcpu_rt->dst); | |
1022 | rt6_dst_from_metrics_check(pcpu_rt); | |
1023 | return pcpu_rt; | |
1024 | } | |
1025 | ||
8ed67789 | 1026 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 1027 | struct flowi6 *fl6, int flags) |
1da177e4 | 1028 | { |
367efcb9 | 1029 | struct fib6_node *fn, *saved_fn; |
45e4fd26 | 1030 | struct rt6_info *rt; |
c71099ac | 1031 | int strict = 0; |
1da177e4 | 1032 | |
77d16f45 | 1033 | strict |= flags & RT6_LOOKUP_F_IFACE; |
367efcb9 MKL |
1034 | if (net->ipv6.devconf_all->forwarding == 0) |
1035 | strict |= RT6_LOOKUP_F_REACHABLE; | |
1da177e4 | 1036 | |
c71099ac | 1037 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 1038 | |
4c9483b2 | 1039 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
367efcb9 | 1040 | saved_fn = fn; |
1da177e4 | 1041 | |
a3c00e46 | 1042 | redo_rt6_select: |
367efcb9 | 1043 | rt = rt6_select(fn, oif, strict); |
52bd4c0c | 1044 | if (rt->rt6i_nsiblings) |
367efcb9 | 1045 | rt = rt6_multipath_select(rt, fl6, oif, strict); |
a3c00e46 MKL |
1046 | if (rt == net->ipv6.ip6_null_entry) { |
1047 | fn = fib6_backtrack(fn, &fl6->saddr); | |
1048 | if (fn) | |
1049 | goto redo_rt6_select; | |
367efcb9 MKL |
1050 | else if (strict & RT6_LOOKUP_F_REACHABLE) { |
1051 | /* also consider unreachable route */ | |
1052 | strict &= ~RT6_LOOKUP_F_REACHABLE; | |
1053 | fn = saved_fn; | |
1054 | goto redo_rt6_select; | |
367efcb9 | 1055 | } |
a3c00e46 MKL |
1056 | } |
1057 | ||
fb9de91e | 1058 | |
3da59bd9 | 1059 | if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) { |
d52d3997 MKL |
1060 | dst_use(&rt->dst, jiffies); |
1061 | read_unlock_bh(&table->tb6_lock); | |
1062 | ||
1063 | rt6_dst_from_metrics_check(rt); | |
1064 | return rt; | |
3da59bd9 MKL |
1065 | } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) && |
1066 | !(rt->rt6i_flags & RTF_GATEWAY))) { | |
1067 | /* Create a RTF_CACHE clone which will not be | |
1068 | * owned by the fib6 tree. It is for the special case where | |
1069 | * the daddr in the skb during the neighbor look-up is different | |
1070 | * from the fl6->daddr used to look-up route here. | |
1071 | */ | |
1072 | ||
1073 | struct rt6_info *uncached_rt; | |
1074 | ||
d52d3997 MKL |
1075 | dst_use(&rt->dst, jiffies); |
1076 | read_unlock_bh(&table->tb6_lock); | |
1077 | ||
3da59bd9 MKL |
1078 | uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL); |
1079 | dst_release(&rt->dst); | |
c71099ac | 1080 | |
3da59bd9 | 1081 | if (uncached_rt) |
8d0b94af | 1082 | rt6_uncached_list_add(uncached_rt); |
3da59bd9 MKL |
1083 | else |
1084 | uncached_rt = net->ipv6.ip6_null_entry; | |
d52d3997 | 1085 | |
3da59bd9 MKL |
1086 | dst_hold(&uncached_rt->dst); |
1087 | return uncached_rt; | |
3da59bd9 | 1088 | |
d52d3997 MKL |
1089 | } else { |
1090 | /* Get a percpu copy */ | |
1091 | ||
1092 | struct rt6_info *pcpu_rt; | |
1093 | ||
1094 | rt->dst.lastuse = jiffies; | |
1095 | rt->dst.__use++; | |
1096 | pcpu_rt = rt6_get_pcpu_route(rt); | |
1097 | read_unlock_bh(&table->tb6_lock); | |
1098 | ||
1099 | return pcpu_rt; | |
1100 | } | |
1da177e4 LT |
1101 | } |
1102 | ||
8ed67789 | 1103 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 1104 | struct flowi6 *fl6, int flags) |
4acad72d | 1105 | { |
4c9483b2 | 1106 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
1107 | } |
1108 | ||
72331bc0 SL |
1109 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
1110 | struct net_device *dev, | |
1111 | struct flowi6 *fl6, int flags) | |
1112 | { | |
1113 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1114 | flags |= RT6_LOOKUP_F_IFACE; | |
1115 | ||
1116 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1117 | } | |
1118 | ||
c71099ac TG |
1119 | void ip6_route_input(struct sk_buff *skb) |
1120 | { | |
b71d1d42 | 1121 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1122 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1123 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
1124 | struct flowi6 fl6 = { |
1125 | .flowi6_iif = skb->dev->ifindex, | |
1126 | .daddr = iph->daddr, | |
1127 | .saddr = iph->saddr, | |
6502ca52 | 1128 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1129 | .flowi6_mark = skb->mark, |
1130 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1131 | }; |
adaa70bb | 1132 | |
72331bc0 | 1133 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1134 | } |
1135 | ||
8ed67789 | 1136 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1137 | struct flowi6 *fl6, int flags) |
1da177e4 | 1138 | { |
4c9483b2 | 1139 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1140 | } |
1141 | ||
67ba4152 | 1142 | struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1143 | struct flowi6 *fl6) |
c71099ac TG |
1144 | { |
1145 | int flags = 0; | |
1146 | ||
1fb9489b | 1147 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1148 | |
4c9483b2 | 1149 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 1150 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1151 | |
4c9483b2 | 1152 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 1153 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1154 | else if (sk) |
1155 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1156 | |
4c9483b2 | 1157 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 | 1158 | } |
7159039a | 1159 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1160 | |
2774c131 | 1161 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1162 | { |
5c1e6aa3 | 1163 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1164 | struct dst_entry *new = NULL; |
1165 | ||
f5b0a874 | 1166 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1167 | if (rt) { |
d8d1f30b | 1168 | new = &rt->dst; |
14e50e57 | 1169 | |
8104891b | 1170 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
8104891b | 1171 | |
14e50e57 | 1172 | new->__use = 1; |
352e512c | 1173 | new->input = dst_discard; |
aad88724 | 1174 | new->output = dst_discard_sk; |
14e50e57 | 1175 | |
21efcfa0 ED |
1176 | if (dst_metrics_read_only(&ort->dst)) |
1177 | new->_metrics = ort->dst._metrics; | |
1178 | else | |
1179 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1180 | rt->rt6i_idev = ort->rt6i_idev; |
1181 | if (rt->rt6i_idev) | |
1182 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1183 | |
4e3fd7a0 | 1184 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 | 1185 | rt->rt6i_flags = ort->rt6i_flags; |
14e50e57 DM |
1186 | rt->rt6i_metric = 0; |
1187 | ||
1188 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1189 | #ifdef CONFIG_IPV6_SUBTREES | |
1190 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1191 | #endif | |
1192 | ||
1193 | dst_free(new); | |
1194 | } | |
1195 | ||
69ead7af DM |
1196 | dst_release(dst_orig); |
1197 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1198 | } |
14e50e57 | 1199 | |
1da177e4 LT |
1200 | /* |
1201 | * Destination cache support functions | |
1202 | */ | |
1203 | ||
4b32b5ad MKL |
1204 | static void rt6_dst_from_metrics_check(struct rt6_info *rt) |
1205 | { | |
1206 | if (rt->dst.from && | |
1207 | dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from)) | |
1208 | dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true); | |
1209 | } | |
1210 | ||
3da59bd9 MKL |
1211 | static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie) |
1212 | { | |
1213 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) | |
1214 | return NULL; | |
1215 | ||
1216 | if (rt6_check_expired(rt)) | |
1217 | return NULL; | |
1218 | ||
1219 | return &rt->dst; | |
1220 | } | |
1221 | ||
1222 | static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie) | |
1223 | { | |
1224 | if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1225 | rt6_check((struct rt6_info *)(rt->dst.from), cookie)) | |
1226 | return &rt->dst; | |
1227 | else | |
1228 | return NULL; | |
1229 | } | |
1230 | ||
1da177e4 LT |
1231 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
1232 | { | |
1233 | struct rt6_info *rt; | |
1234 | ||
1235 | rt = (struct rt6_info *) dst; | |
1236 | ||
6f3118b5 ND |
1237 | /* All IPV6 dsts are created with ->obsolete set to the value |
1238 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1239 | * into this function always. | |
1240 | */ | |
e3bc10bd | 1241 | |
4b32b5ad MKL |
1242 | rt6_dst_from_metrics_check(rt); |
1243 | ||
d52d3997 | 1244 | if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE)) |
3da59bd9 MKL |
1245 | return rt6_dst_from_check(rt, cookie); |
1246 | else | |
1247 | return rt6_check(rt, cookie); | |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1251 | { | |
1252 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1253 | ||
1254 | if (rt) { | |
54c1a859 YH |
1255 | if (rt->rt6i_flags & RTF_CACHE) { |
1256 | if (rt6_check_expired(rt)) { | |
1257 | ip6_del_rt(rt); | |
1258 | dst = NULL; | |
1259 | } | |
1260 | } else { | |
1da177e4 | 1261 | dst_release(dst); |
54c1a859 YH |
1262 | dst = NULL; |
1263 | } | |
1da177e4 | 1264 | } |
54c1a859 | 1265 | return dst; |
1da177e4 LT |
1266 | } |
1267 | ||
1268 | static void ip6_link_failure(struct sk_buff *skb) | |
1269 | { | |
1270 | struct rt6_info *rt; | |
1271 | ||
3ffe533c | 1272 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1273 | |
adf30907 | 1274 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1275 | if (rt) { |
1eb4f758 HFS |
1276 | if (rt->rt6i_flags & RTF_CACHE) { |
1277 | dst_hold(&rt->dst); | |
1278 | if (ip6_del_rt(rt)) | |
1279 | dst_free(&rt->dst); | |
1280 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { | |
1da177e4 | 1281 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1282 | } |
1da177e4 LT |
1283 | } |
1284 | } | |
1285 | ||
45e4fd26 MKL |
1286 | static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu) |
1287 | { | |
1288 | struct net *net = dev_net(rt->dst.dev); | |
1289 | ||
1290 | rt->rt6i_flags |= RTF_MODIFIED; | |
1291 | rt->rt6i_pmtu = mtu; | |
1292 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); | |
1293 | } | |
1294 | ||
1295 | static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk, | |
1296 | const struct ipv6hdr *iph, u32 mtu) | |
1da177e4 | 1297 | { |
67ba4152 | 1298 | struct rt6_info *rt6 = (struct rt6_info *)dst; |
1da177e4 | 1299 | |
45e4fd26 MKL |
1300 | if (rt6->rt6i_flags & RTF_LOCAL) |
1301 | return; | |
81aded24 | 1302 | |
45e4fd26 MKL |
1303 | dst_confirm(dst); |
1304 | mtu = max_t(u32, mtu, IPV6_MIN_MTU); | |
1305 | if (mtu >= dst_mtu(dst)) | |
1306 | return; | |
9d289715 | 1307 | |
45e4fd26 MKL |
1308 | if (rt6->rt6i_flags & RTF_CACHE) { |
1309 | rt6_do_update_pmtu(rt6, mtu); | |
1310 | } else { | |
1311 | const struct in6_addr *daddr, *saddr; | |
1312 | struct rt6_info *nrt6; | |
1313 | ||
1314 | if (iph) { | |
1315 | daddr = &iph->daddr; | |
1316 | saddr = &iph->saddr; | |
1317 | } else if (sk) { | |
1318 | daddr = &sk->sk_v6_daddr; | |
1319 | saddr = &inet6_sk(sk)->saddr; | |
1320 | } else { | |
1321 | return; | |
1322 | } | |
1323 | nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr); | |
1324 | if (nrt6) { | |
1325 | rt6_do_update_pmtu(nrt6, mtu); | |
1326 | ||
1327 | /* ip6_ins_rt(nrt6) will bump the | |
1328 | * rt6->rt6i_node->fn_sernum | |
1329 | * which will fail the next rt6_check() and | |
1330 | * invalidate the sk->sk_dst_cache. | |
1331 | */ | |
1332 | ip6_ins_rt(nrt6); | |
1333 | } | |
1da177e4 LT |
1334 | } |
1335 | } | |
1336 | ||
45e4fd26 MKL |
1337 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1338 | struct sk_buff *skb, u32 mtu) | |
1339 | { | |
1340 | __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu); | |
1341 | } | |
1342 | ||
42ae66c8 DM |
1343 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1344 | int oif, u32 mark) | |
81aded24 DM |
1345 | { |
1346 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1347 | struct dst_entry *dst; | |
1348 | struct flowi6 fl6; | |
1349 | ||
1350 | memset(&fl6, 0, sizeof(fl6)); | |
1351 | fl6.flowi6_oif = oif; | |
1b3c61dc | 1352 | fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); |
81aded24 DM |
1353 | fl6.daddr = iph->daddr; |
1354 | fl6.saddr = iph->saddr; | |
6502ca52 | 1355 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1356 | |
1357 | dst = ip6_route_output(net, NULL, &fl6); | |
1358 | if (!dst->error) | |
45e4fd26 | 1359 | __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu)); |
81aded24 DM |
1360 | dst_release(dst); |
1361 | } | |
1362 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1363 | ||
1364 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1365 | { | |
1366 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1367 | sk->sk_bound_dev_if, sk->sk_mark); | |
1368 | } | |
1369 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1370 | ||
b55b76b2 DJ |
1371 | /* Handle redirects */ |
1372 | struct ip6rd_flowi { | |
1373 | struct flowi6 fl6; | |
1374 | struct in6_addr gateway; | |
1375 | }; | |
1376 | ||
1377 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1378 | struct fib6_table *table, | |
1379 | struct flowi6 *fl6, | |
1380 | int flags) | |
1381 | { | |
1382 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1383 | struct rt6_info *rt; | |
1384 | struct fib6_node *fn; | |
1385 | ||
1386 | /* Get the "current" route for this destination and | |
1387 | * check if the redirect has come from approriate router. | |
1388 | * | |
1389 | * RFC 4861 specifies that redirects should only be | |
1390 | * accepted if they come from the nexthop to the target. | |
1391 | * Due to the way the routes are chosen, this notion | |
1392 | * is a bit fuzzy and one might need to check all possible | |
1393 | * routes. | |
1394 | */ | |
1395 | ||
1396 | read_lock_bh(&table->tb6_lock); | |
1397 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1398 | restart: | |
1399 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1400 | if (rt6_check_expired(rt)) | |
1401 | continue; | |
1402 | if (rt->dst.error) | |
1403 | break; | |
1404 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1405 | continue; | |
1406 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1407 | continue; | |
1408 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1409 | continue; | |
1410 | break; | |
1411 | } | |
1412 | ||
1413 | if (!rt) | |
1414 | rt = net->ipv6.ip6_null_entry; | |
1415 | else if (rt->dst.error) { | |
1416 | rt = net->ipv6.ip6_null_entry; | |
b0a1ba59 MKL |
1417 | goto out; |
1418 | } | |
1419 | ||
1420 | if (rt == net->ipv6.ip6_null_entry) { | |
a3c00e46 MKL |
1421 | fn = fib6_backtrack(fn, &fl6->saddr); |
1422 | if (fn) | |
1423 | goto restart; | |
b55b76b2 | 1424 | } |
a3c00e46 | 1425 | |
b0a1ba59 | 1426 | out: |
b55b76b2 DJ |
1427 | dst_hold(&rt->dst); |
1428 | ||
1429 | read_unlock_bh(&table->tb6_lock); | |
1430 | ||
1431 | return rt; | |
1432 | }; | |
1433 | ||
1434 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1435 | const struct flowi6 *fl6, | |
1436 | const struct in6_addr *gateway) | |
1437 | { | |
1438 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1439 | struct ip6rd_flowi rdfl; | |
1440 | ||
1441 | rdfl.fl6 = *fl6; | |
1442 | rdfl.gateway = *gateway; | |
1443 | ||
1444 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1445 | flags, __ip6_route_redirect); | |
1446 | } | |
1447 | ||
3a5ad2ee DM |
1448 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1449 | { | |
1450 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1451 | struct dst_entry *dst; | |
1452 | struct flowi6 fl6; | |
1453 | ||
1454 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1455 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
3a5ad2ee DM |
1456 | fl6.flowi6_oif = oif; |
1457 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1458 | fl6.daddr = iph->daddr; |
1459 | fl6.saddr = iph->saddr; | |
6502ca52 | 1460 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee | 1461 | |
b55b76b2 DJ |
1462 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1463 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1464 | dst_release(dst); |
1465 | } | |
1466 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1467 | ||
c92a59ec DJ |
1468 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1469 | u32 mark) | |
1470 | { | |
1471 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1472 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1473 | struct dst_entry *dst; | |
1474 | struct flowi6 fl6; | |
1475 | ||
1476 | memset(&fl6, 0, sizeof(fl6)); | |
e374c618 | 1477 | fl6.flowi6_iif = LOOPBACK_IFINDEX; |
c92a59ec DJ |
1478 | fl6.flowi6_oif = oif; |
1479 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1480 | fl6.daddr = msg->dest; |
1481 | fl6.saddr = iph->daddr; | |
1482 | ||
b55b76b2 DJ |
1483 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1484 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1485 | dst_release(dst); |
1486 | } | |
1487 | ||
3a5ad2ee DM |
1488 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1489 | { | |
1490 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1491 | } | |
1492 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1493 | ||
0dbaee3b | 1494 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1495 | { |
0dbaee3b DM |
1496 | struct net_device *dev = dst->dev; |
1497 | unsigned int mtu = dst_mtu(dst); | |
1498 | struct net *net = dev_net(dev); | |
1499 | ||
1da177e4 LT |
1500 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1501 | ||
5578689a DL |
1502 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1503 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1504 | |
1505 | /* | |
1ab1457c YH |
1506 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1507 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1508 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1509 | * rely only on pmtu discovery" |
1510 | */ | |
1511 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1512 | mtu = IPV6_MAXPLEN; | |
1513 | return mtu; | |
1514 | } | |
1515 | ||
ebb762f2 | 1516 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1517 | { |
4b32b5ad MKL |
1518 | const struct rt6_info *rt = (const struct rt6_info *)dst; |
1519 | unsigned int mtu = rt->rt6i_pmtu; | |
d33e4553 | 1520 | struct inet6_dev *idev; |
618f9bc7 | 1521 | |
4b32b5ad MKL |
1522 | if (mtu) |
1523 | goto out; | |
1524 | ||
1525 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
618f9bc7 | 1526 | if (mtu) |
30f78d8e | 1527 | goto out; |
618f9bc7 SK |
1528 | |
1529 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1530 | |
1531 | rcu_read_lock(); | |
1532 | idev = __in6_dev_get(dst->dev); | |
1533 | if (idev) | |
1534 | mtu = idev->cnf.mtu6; | |
1535 | rcu_read_unlock(); | |
1536 | ||
30f78d8e ED |
1537 | out: |
1538 | return min_t(unsigned int, mtu, IP6_MAX_MTU); | |
d33e4553 DM |
1539 | } |
1540 | ||
3b00944c YH |
1541 | static struct dst_entry *icmp6_dst_gc_list; |
1542 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1543 | |
3b00944c | 1544 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1545 | struct flowi6 *fl6) |
1da177e4 | 1546 | { |
87a11578 | 1547 | struct dst_entry *dst; |
1da177e4 LT |
1548 | struct rt6_info *rt; |
1549 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1550 | struct net *net = dev_net(dev); |
1da177e4 | 1551 | |
38308473 | 1552 | if (unlikely(!idev)) |
122bdf67 | 1553 | return ERR_PTR(-ENODEV); |
1da177e4 | 1554 | |
8b96d22d | 1555 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1556 | if (unlikely(!rt)) { |
1da177e4 | 1557 | in6_dev_put(idev); |
87a11578 | 1558 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1559 | goto out; |
1560 | } | |
1561 | ||
8e2ec639 YZ |
1562 | rt->dst.flags |= DST_HOST; |
1563 | rt->dst.output = ip6_output; | |
d8d1f30b | 1564 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1565 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1566 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1567 | rt->rt6i_dst.plen = 128; |
1568 | rt->rt6i_idev = idev; | |
14edd87d | 1569 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1570 | |
3b00944c | 1571 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1572 | rt->dst.next = icmp6_dst_gc_list; |
1573 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1574 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1575 | |
5578689a | 1576 | fib6_force_start_gc(net); |
1da177e4 | 1577 | |
87a11578 DM |
1578 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1579 | ||
1da177e4 | 1580 | out: |
87a11578 | 1581 | return dst; |
1da177e4 LT |
1582 | } |
1583 | ||
3d0f24a7 | 1584 | int icmp6_dst_gc(void) |
1da177e4 | 1585 | { |
e9476e95 | 1586 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1587 | int more = 0; |
1da177e4 | 1588 | |
3b00944c YH |
1589 | spin_lock_bh(&icmp6_dst_lock); |
1590 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1591 | |
1da177e4 LT |
1592 | while ((dst = *pprev) != NULL) { |
1593 | if (!atomic_read(&dst->__refcnt)) { | |
1594 | *pprev = dst->next; | |
1595 | dst_free(dst); | |
1da177e4 LT |
1596 | } else { |
1597 | pprev = &dst->next; | |
3d0f24a7 | 1598 | ++more; |
1da177e4 LT |
1599 | } |
1600 | } | |
1601 | ||
3b00944c | 1602 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1603 | |
3d0f24a7 | 1604 | return more; |
1da177e4 LT |
1605 | } |
1606 | ||
1e493d19 DM |
1607 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1608 | void *arg) | |
1609 | { | |
1610 | struct dst_entry *dst, **pprev; | |
1611 | ||
1612 | spin_lock_bh(&icmp6_dst_lock); | |
1613 | pprev = &icmp6_dst_gc_list; | |
1614 | while ((dst = *pprev) != NULL) { | |
1615 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1616 | if (func(rt, arg)) { | |
1617 | *pprev = dst->next; | |
1618 | dst_free(dst); | |
1619 | } else { | |
1620 | pprev = &dst->next; | |
1621 | } | |
1622 | } | |
1623 | spin_unlock_bh(&icmp6_dst_lock); | |
1624 | } | |
1625 | ||
569d3645 | 1626 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1627 | { |
86393e52 | 1628 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1629 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1630 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1631 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1632 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1633 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1634 | int entries; |
7019b78e | 1635 | |
fc66f95c | 1636 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1637 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1638 | entries <= rt_max_size) |
1da177e4 LT |
1639 | goto out; |
1640 | ||
6891a346 | 1641 | net->ipv6.ip6_rt_gc_expire++; |
14956643 | 1642 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); |
fc66f95c ED |
1643 | entries = dst_entries_get_slow(ops); |
1644 | if (entries < ops->gc_thresh) | |
7019b78e | 1645 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1646 | out: |
7019b78e | 1647 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1648 | return entries > rt_max_size; |
1da177e4 LT |
1649 | } |
1650 | ||
e715b6d3 FW |
1651 | static int ip6_convert_metrics(struct mx6_config *mxc, |
1652 | const struct fib6_config *cfg) | |
1653 | { | |
1654 | struct nlattr *nla; | |
1655 | int remaining; | |
1656 | u32 *mp; | |
1657 | ||
63159f29 | 1658 | if (!cfg->fc_mx) |
e715b6d3 FW |
1659 | return 0; |
1660 | ||
1661 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1662 | if (unlikely(!mp)) | |
1663 | return -ENOMEM; | |
1664 | ||
1665 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
1666 | int type = nla_type(nla); | |
1667 | ||
1668 | if (type) { | |
ea697639 DB |
1669 | u32 val; |
1670 | ||
e715b6d3 FW |
1671 | if (unlikely(type > RTAX_MAX)) |
1672 | goto err; | |
ea697639 DB |
1673 | if (type == RTAX_CC_ALGO) { |
1674 | char tmp[TCP_CA_NAME_MAX]; | |
1675 | ||
1676 | nla_strlcpy(tmp, nla, sizeof(tmp)); | |
1677 | val = tcp_ca_get_key_by_name(tmp); | |
1678 | if (val == TCP_CA_UNSPEC) | |
1679 | goto err; | |
1680 | } else { | |
1681 | val = nla_get_u32(nla); | |
1682 | } | |
e715b6d3 | 1683 | |
ea697639 | 1684 | mp[type - 1] = val; |
e715b6d3 FW |
1685 | __set_bit(type - 1, mxc->mx_valid); |
1686 | } | |
1687 | } | |
1688 | ||
1689 | mxc->mx = mp; | |
1690 | ||
1691 | return 0; | |
1692 | err: | |
1693 | kfree(mp); | |
1694 | return -EINVAL; | |
1695 | } | |
1da177e4 | 1696 | |
86872cb5 | 1697 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1698 | { |
1699 | int err; | |
5578689a | 1700 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1701 | struct rt6_info *rt = NULL; |
1702 | struct net_device *dev = NULL; | |
1703 | struct inet6_dev *idev = NULL; | |
c71099ac | 1704 | struct fib6_table *table; |
e715b6d3 | 1705 | struct mx6_config mxc = { .mx = NULL, }; |
1da177e4 LT |
1706 | int addr_type; |
1707 | ||
86872cb5 | 1708 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1709 | return -EINVAL; |
1710 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1711 | if (cfg->fc_src_len) |
1da177e4 LT |
1712 | return -EINVAL; |
1713 | #endif | |
86872cb5 | 1714 | if (cfg->fc_ifindex) { |
1da177e4 | 1715 | err = -ENODEV; |
5578689a | 1716 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1717 | if (!dev) |
1718 | goto out; | |
1719 | idev = in6_dev_get(dev); | |
1720 | if (!idev) | |
1721 | goto out; | |
1722 | } | |
1723 | ||
86872cb5 TG |
1724 | if (cfg->fc_metric == 0) |
1725 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1726 | |
d71314b4 | 1727 | err = -ENOBUFS; |
38308473 DM |
1728 | if (cfg->fc_nlinfo.nlh && |
1729 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1730 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1731 | if (!table) { |
f3213831 | 1732 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1733 | table = fib6_new_table(net, cfg->fc_table); |
1734 | } | |
1735 | } else { | |
1736 | table = fib6_new_table(net, cfg->fc_table); | |
1737 | } | |
38308473 DM |
1738 | |
1739 | if (!table) | |
c71099ac | 1740 | goto out; |
c71099ac | 1741 | |
c88507fb | 1742 | rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table); |
1da177e4 | 1743 | |
38308473 | 1744 | if (!rt) { |
1da177e4 LT |
1745 | err = -ENOMEM; |
1746 | goto out; | |
1747 | } | |
1748 | ||
1716a961 G |
1749 | if (cfg->fc_flags & RTF_EXPIRES) |
1750 | rt6_set_expires(rt, jiffies + | |
1751 | clock_t_to_jiffies(cfg->fc_expires)); | |
1752 | else | |
1753 | rt6_clean_expires(rt); | |
1da177e4 | 1754 | |
86872cb5 TG |
1755 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1756 | cfg->fc_protocol = RTPROT_BOOT; | |
1757 | rt->rt6i_protocol = cfg->fc_protocol; | |
1758 | ||
1759 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1760 | |
1761 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1762 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1763 | else if (cfg->fc_flags & RTF_LOCAL) |
1764 | rt->dst.input = ip6_input; | |
1da177e4 | 1765 | else |
d8d1f30b | 1766 | rt->dst.input = ip6_forward; |
1da177e4 | 1767 | |
d8d1f30b | 1768 | rt->dst.output = ip6_output; |
1da177e4 | 1769 | |
19e42e45 RP |
1770 | if (cfg->fc_encap) { |
1771 | struct lwtunnel_state *lwtstate; | |
1772 | ||
1773 | err = lwtunnel_build_state(dev, cfg->fc_encap_type, | |
1774 | cfg->fc_encap, &lwtstate); | |
1775 | if (err) | |
1776 | goto out; | |
5a6228a0 | 1777 | rt->rt6i_lwtstate = lwtstate_get(lwtstate); |
6673a9f4 ND |
1778 | if (lwtunnel_output_redirect(rt->rt6i_lwtstate)) |
1779 | rt->dst.output = lwtunnel_output6; | |
19e42e45 RP |
1780 | } |
1781 | ||
86872cb5 TG |
1782 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1783 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
afc4eef8 | 1784 | if (rt->rt6i_dst.plen == 128) |
e5fd387a | 1785 | rt->dst.flags |= DST_HOST; |
e5fd387a | 1786 | |
1da177e4 | 1787 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1788 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1789 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1790 | #endif |
1791 | ||
86872cb5 | 1792 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1793 | |
1794 | /* We cannot add true routes via loopback here, | |
1795 | they would result in kernel looping; promote them to reject routes | |
1796 | */ | |
86872cb5 | 1797 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1798 | (dev && (dev->flags & IFF_LOOPBACK) && |
1799 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1800 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1801 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1802 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1803 | if (dev) { |
1804 | dev_put(dev); | |
1805 | in6_dev_put(idev); | |
1806 | } | |
5578689a | 1807 | dev = net->loopback_dev; |
1da177e4 LT |
1808 | dev_hold(dev); |
1809 | idev = in6_dev_get(dev); | |
1810 | if (!idev) { | |
1811 | err = -ENODEV; | |
1812 | goto out; | |
1813 | } | |
1814 | } | |
1da177e4 | 1815 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1816 | switch (cfg->fc_type) { |
1817 | case RTN_BLACKHOLE: | |
1818 | rt->dst.error = -EINVAL; | |
aad88724 | 1819 | rt->dst.output = dst_discard_sk; |
7150aede | 1820 | rt->dst.input = dst_discard; |
ef2c7d7b ND |
1821 | break; |
1822 | case RTN_PROHIBIT: | |
1823 | rt->dst.error = -EACCES; | |
7150aede K |
1824 | rt->dst.output = ip6_pkt_prohibit_out; |
1825 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1826 | break; |
b4949ab2 | 1827 | case RTN_THROW: |
ef2c7d7b | 1828 | default: |
7150aede K |
1829 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
1830 | : -ENETUNREACH; | |
1831 | rt->dst.output = ip6_pkt_discard_out; | |
1832 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1833 | break; |
1834 | } | |
1da177e4 LT |
1835 | goto install_route; |
1836 | } | |
1837 | ||
86872cb5 | 1838 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1839 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1840 | int gwa_type; |
1841 | ||
86872cb5 | 1842 | gw_addr = &cfg->fc_gateway; |
48ed7b26 FW |
1843 | |
1844 | /* if gw_addr is local we will fail to detect this in case | |
1845 | * address is still TENTATIVE (DAD in progress). rt6_lookup() | |
1846 | * will return already-added prefix route via interface that | |
1847 | * prefix route was assigned to, which might be non-loopback. | |
1848 | */ | |
1849 | err = -EINVAL; | |
1850 | if (ipv6_chk_addr_and_flags(net, gw_addr, NULL, 0, 0)) | |
1851 | goto out; | |
1852 | ||
4e3fd7a0 | 1853 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1854 | gwa_type = ipv6_addr_type(gw_addr); |
1855 | ||
1856 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1857 | struct rt6_info *grt; | |
1858 | ||
1859 | /* IPv6 strictly inhibits using not link-local | |
1860 | addresses as nexthop address. | |
1861 | Otherwise, router will not able to send redirects. | |
1862 | It is very good, but in some (rare!) circumstances | |
1863 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1864 | some exceptions. --ANK | |
1865 | */ | |
38308473 | 1866 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1867 | goto out; |
1868 | ||
5578689a | 1869 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1870 | |
1871 | err = -EHOSTUNREACH; | |
38308473 | 1872 | if (!grt) |
1da177e4 LT |
1873 | goto out; |
1874 | if (dev) { | |
d1918542 | 1875 | if (dev != grt->dst.dev) { |
94e187c0 | 1876 | ip6_rt_put(grt); |
1da177e4 LT |
1877 | goto out; |
1878 | } | |
1879 | } else { | |
d1918542 | 1880 | dev = grt->dst.dev; |
1da177e4 LT |
1881 | idev = grt->rt6i_idev; |
1882 | dev_hold(dev); | |
1883 | in6_dev_hold(grt->rt6i_idev); | |
1884 | } | |
38308473 | 1885 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1886 | err = 0; |
94e187c0 | 1887 | ip6_rt_put(grt); |
1da177e4 LT |
1888 | |
1889 | if (err) | |
1890 | goto out; | |
1891 | } | |
1892 | err = -EINVAL; | |
38308473 | 1893 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1894 | goto out; |
1895 | } | |
1896 | ||
1897 | err = -ENODEV; | |
38308473 | 1898 | if (!dev) |
1da177e4 LT |
1899 | goto out; |
1900 | ||
c3968a85 DW |
1901 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1902 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1903 | err = -EINVAL; | |
1904 | goto out; | |
1905 | } | |
4e3fd7a0 | 1906 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1907 | rt->rt6i_prefsrc.plen = 128; |
1908 | } else | |
1909 | rt->rt6i_prefsrc.plen = 0; | |
1910 | ||
86872cb5 | 1911 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1912 | |
1913 | install_route: | |
d8d1f30b | 1914 | rt->dst.dev = dev; |
1da177e4 | 1915 | rt->rt6i_idev = idev; |
c71099ac | 1916 | rt->rt6i_table = table; |
63152fc0 | 1917 | |
c346dca1 | 1918 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1919 | |
e715b6d3 FW |
1920 | err = ip6_convert_metrics(&mxc, cfg); |
1921 | if (err) | |
1922 | goto out; | |
1da177e4 | 1923 | |
e715b6d3 FW |
1924 | err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); |
1925 | ||
1926 | kfree(mxc.mx); | |
1927 | return err; | |
1da177e4 LT |
1928 | out: |
1929 | if (dev) | |
1930 | dev_put(dev); | |
1931 | if (idev) | |
1932 | in6_dev_put(idev); | |
1933 | if (rt) | |
d8d1f30b | 1934 | dst_free(&rt->dst); |
1da177e4 LT |
1935 | return err; |
1936 | } | |
1937 | ||
86872cb5 | 1938 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1939 | { |
1940 | int err; | |
c71099ac | 1941 | struct fib6_table *table; |
d1918542 | 1942 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1943 | |
6825a26c G |
1944 | if (rt == net->ipv6.ip6_null_entry) { |
1945 | err = -ENOENT; | |
1946 | goto out; | |
1947 | } | |
6c813a72 | 1948 | |
c71099ac TG |
1949 | table = rt->rt6i_table; |
1950 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 1951 | err = fib6_del(rt, info); |
c71099ac | 1952 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 1953 | |
6825a26c | 1954 | out: |
94e187c0 | 1955 | ip6_rt_put(rt); |
1da177e4 LT |
1956 | return err; |
1957 | } | |
1958 | ||
e0a1ad73 TG |
1959 | int ip6_del_rt(struct rt6_info *rt) |
1960 | { | |
4d1169c1 | 1961 | struct nl_info info = { |
d1918542 | 1962 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1963 | }; |
528c4ceb | 1964 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1965 | } |
1966 | ||
86872cb5 | 1967 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1968 | { |
c71099ac | 1969 | struct fib6_table *table; |
1da177e4 LT |
1970 | struct fib6_node *fn; |
1971 | struct rt6_info *rt; | |
1972 | int err = -ESRCH; | |
1973 | ||
5578689a | 1974 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1975 | if (!table) |
c71099ac TG |
1976 | return err; |
1977 | ||
1978 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1979 | |
c71099ac | 1980 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1981 | &cfg->fc_dst, cfg->fc_dst_len, |
1982 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1983 | |
1da177e4 | 1984 | if (fn) { |
d8d1f30b | 1985 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
1f56a01f MKL |
1986 | if ((rt->rt6i_flags & RTF_CACHE) && |
1987 | !(cfg->fc_flags & RTF_CACHE)) | |
1988 | continue; | |
86872cb5 | 1989 | if (cfg->fc_ifindex && |
d1918542 DM |
1990 | (!rt->dst.dev || |
1991 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1992 | continue; |
86872cb5 TG |
1993 | if (cfg->fc_flags & RTF_GATEWAY && |
1994 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1995 | continue; |
86872cb5 | 1996 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1997 | continue; |
d8d1f30b | 1998 | dst_hold(&rt->dst); |
c71099ac | 1999 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 2000 | |
86872cb5 | 2001 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
2002 | } |
2003 | } | |
c71099ac | 2004 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2005 | |
2006 | return err; | |
2007 | } | |
2008 | ||
6700c270 | 2009 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 2010 | { |
e8599ff4 | 2011 | struct net *net = dev_net(skb->dev); |
a6279458 | 2012 | struct netevent_redirect netevent; |
e8599ff4 | 2013 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
2014 | struct ndisc_options ndopts; |
2015 | struct inet6_dev *in6_dev; | |
2016 | struct neighbour *neigh; | |
71bcdba0 | 2017 | struct rd_msg *msg; |
6e157b6a DM |
2018 | int optlen, on_link; |
2019 | u8 *lladdr; | |
e8599ff4 | 2020 | |
29a3cad5 | 2021 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 2022 | optlen -= sizeof(*msg); |
e8599ff4 DM |
2023 | |
2024 | if (optlen < 0) { | |
6e157b6a | 2025 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
2026 | return; |
2027 | } | |
2028 | ||
71bcdba0 | 2029 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 2030 | |
71bcdba0 | 2031 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 2032 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
2033 | return; |
2034 | } | |
2035 | ||
6e157b6a | 2036 | on_link = 0; |
71bcdba0 | 2037 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 2038 | on_link = 1; |
71bcdba0 | 2039 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 2040 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 2041 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
2042 | return; |
2043 | } | |
2044 | ||
2045 | in6_dev = __in6_dev_get(skb->dev); | |
2046 | if (!in6_dev) | |
2047 | return; | |
2048 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
2049 | return; | |
2050 | ||
2051 | /* RFC2461 8.1: | |
2052 | * The IP source address of the Redirect MUST be the same as the current | |
2053 | * first-hop router for the specified ICMP Destination Address. | |
2054 | */ | |
2055 | ||
71bcdba0 | 2056 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
2057 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
2058 | return; | |
2059 | } | |
6e157b6a DM |
2060 | |
2061 | lladdr = NULL; | |
e8599ff4 DM |
2062 | if (ndopts.nd_opts_tgt_lladdr) { |
2063 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
2064 | skb->dev); | |
2065 | if (!lladdr) { | |
2066 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
2067 | return; | |
2068 | } | |
2069 | } | |
2070 | ||
6e157b6a DM |
2071 | rt = (struct rt6_info *) dst; |
2072 | if (rt == net->ipv6.ip6_null_entry) { | |
2073 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 2074 | return; |
6e157b6a | 2075 | } |
e8599ff4 | 2076 | |
6e157b6a DM |
2077 | /* Redirect received -> path was valid. |
2078 | * Look, redirects are sent only in response to data packets, | |
2079 | * so that this nexthop apparently is reachable. --ANK | |
2080 | */ | |
2081 | dst_confirm(&rt->dst); | |
a6279458 | 2082 | |
71bcdba0 | 2083 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
2084 | if (!neigh) |
2085 | return; | |
a6279458 | 2086 | |
1da177e4 LT |
2087 | /* |
2088 | * We have finally decided to accept it. | |
2089 | */ | |
2090 | ||
1ab1457c | 2091 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
2092 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
2093 | NEIGH_UPDATE_F_OVERRIDE| | |
2094 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
2095 | NEIGH_UPDATE_F_ISROUTER)) | |
2096 | ); | |
2097 | ||
83a09abd | 2098 | nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL); |
38308473 | 2099 | if (!nrt) |
1da177e4 LT |
2100 | goto out; |
2101 | ||
2102 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
2103 | if (on_link) | |
2104 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
2105 | ||
4e3fd7a0 | 2106 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 2107 | |
40e22e8f | 2108 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
2109 | goto out; |
2110 | ||
d8d1f30b CG |
2111 | netevent.old = &rt->dst; |
2112 | netevent.new = &nrt->dst; | |
71bcdba0 | 2113 | netevent.daddr = &msg->dest; |
60592833 | 2114 | netevent.neigh = neigh; |
8d71740c TT |
2115 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
2116 | ||
38308473 | 2117 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 2118 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 2119 | ip6_del_rt(rt); |
1da177e4 LT |
2120 | } |
2121 | ||
2122 | out: | |
e8599ff4 | 2123 | neigh_release(neigh); |
6e157b6a DM |
2124 | } |
2125 | ||
1da177e4 LT |
2126 | /* |
2127 | * Misc support functions | |
2128 | */ | |
2129 | ||
4b32b5ad MKL |
2130 | static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from) |
2131 | { | |
2132 | BUG_ON(from->dst.from); | |
2133 | ||
2134 | rt->rt6i_flags &= ~RTF_EXPIRES; | |
2135 | dst_hold(&from->dst); | |
2136 | rt->dst.from = &from->dst; | |
2137 | dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true); | |
2138 | } | |
2139 | ||
83a09abd MKL |
2140 | static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort) |
2141 | { | |
2142 | rt->dst.input = ort->dst.input; | |
2143 | rt->dst.output = ort->dst.output; | |
2144 | rt->rt6i_dst = ort->rt6i_dst; | |
2145 | rt->dst.error = ort->dst.error; | |
2146 | rt->rt6i_idev = ort->rt6i_idev; | |
2147 | if (rt->rt6i_idev) | |
2148 | in6_dev_hold(rt->rt6i_idev); | |
2149 | rt->dst.lastuse = jiffies; | |
2150 | rt->rt6i_gateway = ort->rt6i_gateway; | |
2151 | rt->rt6i_flags = ort->rt6i_flags; | |
2152 | rt6_set_from(rt, ort); | |
2153 | rt->rt6i_metric = ort->rt6i_metric; | |
1da177e4 | 2154 | #ifdef CONFIG_IPV6_SUBTREES |
83a09abd | 2155 | rt->rt6i_src = ort->rt6i_src; |
1da177e4 | 2156 | #endif |
83a09abd MKL |
2157 | rt->rt6i_prefsrc = ort->rt6i_prefsrc; |
2158 | rt->rt6i_table = ort->rt6i_table; | |
5a6228a0 | 2159 | rt->rt6i_lwtstate = lwtstate_get(ort->rt6i_lwtstate); |
1da177e4 LT |
2160 | } |
2161 | ||
70ceb4f5 | 2162 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 2163 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
2164 | const struct in6_addr *prefix, int prefixlen, |
2165 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
2166 | { |
2167 | struct fib6_node *fn; | |
2168 | struct rt6_info *rt = NULL; | |
c71099ac TG |
2169 | struct fib6_table *table; |
2170 | ||
efa2cea0 | 2171 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 2172 | if (!table) |
c71099ac | 2173 | return NULL; |
70ceb4f5 | 2174 | |
5744dd9b | 2175 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2176 | fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); |
70ceb4f5 YH |
2177 | if (!fn) |
2178 | goto out; | |
2179 | ||
d8d1f30b | 2180 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2181 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
2182 | continue; |
2183 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
2184 | continue; | |
2185 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
2186 | continue; | |
d8d1f30b | 2187 | dst_hold(&rt->dst); |
70ceb4f5 YH |
2188 | break; |
2189 | } | |
2190 | out: | |
5744dd9b | 2191 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
2192 | return rt; |
2193 | } | |
2194 | ||
efa2cea0 | 2195 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
2196 | const struct in6_addr *prefix, int prefixlen, |
2197 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 2198 | unsigned int pref) |
70ceb4f5 | 2199 | { |
86872cb5 TG |
2200 | struct fib6_config cfg = { |
2201 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 2202 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2203 | .fc_ifindex = ifindex, |
2204 | .fc_dst_len = prefixlen, | |
2205 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
2206 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 2207 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
2208 | .fc_nlinfo.nlh = NULL, |
2209 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
2210 | }; |
2211 | ||
4e3fd7a0 AD |
2212 | cfg.fc_dst = *prefix; |
2213 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 2214 | |
e317da96 YH |
2215 | /* We should treat it as a default route if prefix length is 0. */ |
2216 | if (!prefixlen) | |
86872cb5 | 2217 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 2218 | |
86872cb5 | 2219 | ip6_route_add(&cfg); |
70ceb4f5 | 2220 | |
efa2cea0 | 2221 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
2222 | } |
2223 | #endif | |
2224 | ||
b71d1d42 | 2225 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2226 | { |
1da177e4 | 2227 | struct rt6_info *rt; |
c71099ac | 2228 | struct fib6_table *table; |
1da177e4 | 2229 | |
c346dca1 | 2230 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2231 | if (!table) |
c71099ac | 2232 | return NULL; |
1da177e4 | 2233 | |
5744dd9b | 2234 | read_lock_bh(&table->tb6_lock); |
67ba4152 | 2235 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 2236 | if (dev == rt->dst.dev && |
045927ff | 2237 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2238 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2239 | break; | |
2240 | } | |
2241 | if (rt) | |
d8d1f30b | 2242 | dst_hold(&rt->dst); |
5744dd9b | 2243 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2244 | return rt; |
2245 | } | |
2246 | ||
b71d1d42 | 2247 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2248 | struct net_device *dev, |
2249 | unsigned int pref) | |
1da177e4 | 2250 | { |
86872cb5 TG |
2251 | struct fib6_config cfg = { |
2252 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 2253 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2254 | .fc_ifindex = dev->ifindex, |
2255 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2256 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2257 | .fc_nlinfo.portid = 0, |
5578689a | 2258 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2259 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2260 | }; |
1da177e4 | 2261 | |
4e3fd7a0 | 2262 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2263 | |
86872cb5 | 2264 | ip6_route_add(&cfg); |
1da177e4 | 2265 | |
1da177e4 LT |
2266 | return rt6_get_dflt_router(gwaddr, dev); |
2267 | } | |
2268 | ||
7b4da532 | 2269 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2270 | { |
2271 | struct rt6_info *rt; | |
c71099ac TG |
2272 | struct fib6_table *table; |
2273 | ||
2274 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2275 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2276 | if (!table) |
c71099ac | 2277 | return; |
1da177e4 LT |
2278 | |
2279 | restart: | |
c71099ac | 2280 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2281 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2282 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2283 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2284 | dst_hold(&rt->dst); |
c71099ac | 2285 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2286 | ip6_del_rt(rt); |
1da177e4 LT |
2287 | goto restart; |
2288 | } | |
2289 | } | |
c71099ac | 2290 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2291 | } |
2292 | ||
5578689a DL |
2293 | static void rtmsg_to_fib6_config(struct net *net, |
2294 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2295 | struct fib6_config *cfg) |
2296 | { | |
2297 | memset(cfg, 0, sizeof(*cfg)); | |
2298 | ||
2299 | cfg->fc_table = RT6_TABLE_MAIN; | |
2300 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
2301 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2302 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2303 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2304 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2305 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2306 | ||
5578689a | 2307 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2308 | |
4e3fd7a0 AD |
2309 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2310 | cfg->fc_src = rtmsg->rtmsg_src; | |
2311 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2312 | } |
2313 | ||
5578689a | 2314 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2315 | { |
86872cb5 | 2316 | struct fib6_config cfg; |
1da177e4 LT |
2317 | struct in6_rtmsg rtmsg; |
2318 | int err; | |
2319 | ||
67ba4152 | 2320 | switch (cmd) { |
1da177e4 LT |
2321 | case SIOCADDRT: /* Add a route */ |
2322 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2323 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2324 | return -EPERM; |
2325 | err = copy_from_user(&rtmsg, arg, | |
2326 | sizeof(struct in6_rtmsg)); | |
2327 | if (err) | |
2328 | return -EFAULT; | |
86872cb5 | 2329 | |
5578689a | 2330 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2331 | |
1da177e4 LT |
2332 | rtnl_lock(); |
2333 | switch (cmd) { | |
2334 | case SIOCADDRT: | |
86872cb5 | 2335 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2336 | break; |
2337 | case SIOCDELRT: | |
86872cb5 | 2338 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2339 | break; |
2340 | default: | |
2341 | err = -EINVAL; | |
2342 | } | |
2343 | rtnl_unlock(); | |
2344 | ||
2345 | return err; | |
3ff50b79 | 2346 | } |
1da177e4 LT |
2347 | |
2348 | return -EINVAL; | |
2349 | } | |
2350 | ||
2351 | /* | |
2352 | * Drop the packet on the floor | |
2353 | */ | |
2354 | ||
d5fdd6ba | 2355 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2356 | { |
612f09e8 | 2357 | int type; |
adf30907 | 2358 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2359 | switch (ipstats_mib_noroutes) { |
2360 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2361 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2362 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2363 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2364 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2365 | break; |
2366 | } | |
2367 | /* FALLTHROUGH */ | |
2368 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2369 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2370 | ipstats_mib_noroutes); | |
612f09e8 YH |
2371 | break; |
2372 | } | |
3ffe533c | 2373 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2374 | kfree_skb(skb); |
2375 | return 0; | |
2376 | } | |
2377 | ||
9ce8ade0 TG |
2378 | static int ip6_pkt_discard(struct sk_buff *skb) |
2379 | { | |
612f09e8 | 2380 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2381 | } |
2382 | ||
aad88724 | 2383 | static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 2384 | { |
adf30907 | 2385 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2386 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2387 | } |
2388 | ||
9ce8ade0 TG |
2389 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2390 | { | |
612f09e8 | 2391 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2392 | } |
2393 | ||
aad88724 | 2394 | static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb) |
9ce8ade0 | 2395 | { |
adf30907 | 2396 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2397 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2398 | } |
2399 | ||
1da177e4 LT |
2400 | /* |
2401 | * Allocate a dst for local (unicast / anycast) address. | |
2402 | */ | |
2403 | ||
2404 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2405 | const struct in6_addr *addr, | |
8f031519 | 2406 | bool anycast) |
1da177e4 | 2407 | { |
c346dca1 | 2408 | struct net *net = dev_net(idev->dev); |
a3300ef4 HFS |
2409 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, |
2410 | DST_NOCOUNT, NULL); | |
2411 | if (!rt) | |
1da177e4 LT |
2412 | return ERR_PTR(-ENOMEM); |
2413 | ||
1da177e4 LT |
2414 | in6_dev_hold(idev); |
2415 | ||
11d53b49 | 2416 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2417 | rt->dst.input = ip6_input; |
2418 | rt->dst.output = ip6_output; | |
1da177e4 | 2419 | rt->rt6i_idev = idev; |
1da177e4 LT |
2420 | |
2421 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2422 | if (anycast) |
2423 | rt->rt6i_flags |= RTF_ANYCAST; | |
2424 | else | |
1da177e4 | 2425 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2426 | |
550bab42 | 2427 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2428 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2429 | rt->rt6i_dst.plen = 128; |
5578689a | 2430 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2431 | |
d8d1f30b | 2432 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2433 | |
2434 | return rt; | |
2435 | } | |
2436 | ||
c3968a85 DW |
2437 | int ip6_route_get_saddr(struct net *net, |
2438 | struct rt6_info *rt, | |
b71d1d42 | 2439 | const struct in6_addr *daddr, |
c3968a85 DW |
2440 | unsigned int prefs, |
2441 | struct in6_addr *saddr) | |
2442 | { | |
e16e888b MS |
2443 | struct inet6_dev *idev = |
2444 | rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; | |
c3968a85 | 2445 | int err = 0; |
e16e888b | 2446 | if (rt && rt->rt6i_prefsrc.plen) |
4e3fd7a0 | 2447 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2448 | else |
2449 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2450 | daddr, prefs, saddr); | |
2451 | return err; | |
2452 | } | |
2453 | ||
2454 | /* remove deleted ip from prefsrc entries */ | |
2455 | struct arg_dev_net_ip { | |
2456 | struct net_device *dev; | |
2457 | struct net *net; | |
2458 | struct in6_addr *addr; | |
2459 | }; | |
2460 | ||
2461 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2462 | { | |
2463 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2464 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2465 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2466 | ||
d1918542 | 2467 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2468 | rt != net->ipv6.ip6_null_entry && |
2469 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2470 | /* remove prefsrc entry */ | |
2471 | rt->rt6i_prefsrc.plen = 0; | |
2472 | } | |
2473 | return 0; | |
2474 | } | |
2475 | ||
2476 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2477 | { | |
2478 | struct net *net = dev_net(ifp->idev->dev); | |
2479 | struct arg_dev_net_ip adni = { | |
2480 | .dev = ifp->idev->dev, | |
2481 | .net = net, | |
2482 | .addr = &ifp->addr, | |
2483 | }; | |
0c3584d5 | 2484 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2485 | } |
2486 | ||
be7a010d DJ |
2487 | #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) |
2488 | #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) | |
2489 | ||
2490 | /* Remove routers and update dst entries when gateway turn into host. */ | |
2491 | static int fib6_clean_tohost(struct rt6_info *rt, void *arg) | |
2492 | { | |
2493 | struct in6_addr *gateway = (struct in6_addr *)arg; | |
2494 | ||
2495 | if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || | |
2496 | ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && | |
2497 | ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { | |
2498 | return -1; | |
2499 | } | |
2500 | return 0; | |
2501 | } | |
2502 | ||
2503 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) | |
2504 | { | |
2505 | fib6_clean_all(net, fib6_clean_tohost, gateway); | |
2506 | } | |
2507 | ||
8ed67789 DL |
2508 | struct arg_dev_net { |
2509 | struct net_device *dev; | |
2510 | struct net *net; | |
2511 | }; | |
2512 | ||
1da177e4 LT |
2513 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2514 | { | |
bc3ef660 | 2515 | const struct arg_dev_net *adn = arg; |
2516 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2517 | |
d1918542 | 2518 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2519 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2520 | return -1; |
c159d30c | 2521 | |
1da177e4 LT |
2522 | return 0; |
2523 | } | |
2524 | ||
f3db4851 | 2525 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2526 | { |
8ed67789 DL |
2527 | struct arg_dev_net adn = { |
2528 | .dev = dev, | |
2529 | .net = net, | |
2530 | }; | |
2531 | ||
0c3584d5 | 2532 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2533 | icmp6_clean_all(fib6_ifdown, &adn); |
8d0b94af | 2534 | rt6_uncached_list_flush_dev(net, dev); |
1da177e4 LT |
2535 | } |
2536 | ||
95c96174 | 2537 | struct rt6_mtu_change_arg { |
1da177e4 | 2538 | struct net_device *dev; |
95c96174 | 2539 | unsigned int mtu; |
1da177e4 LT |
2540 | }; |
2541 | ||
2542 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2543 | { | |
2544 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2545 | struct inet6_dev *idev; | |
2546 | ||
2547 | /* In IPv6 pmtu discovery is not optional, | |
2548 | so that RTAX_MTU lock cannot disable it. | |
2549 | We still use this lock to block changes | |
2550 | caused by addrconf/ndisc. | |
2551 | */ | |
2552 | ||
2553 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2554 | if (!idev) |
1da177e4 LT |
2555 | return 0; |
2556 | ||
2557 | /* For administrative MTU increase, there is no way to discover | |
2558 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2559 | Since RFC 1981 doesn't include administrative MTU increase | |
2560 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2561 | */ | |
2562 | /* | |
2563 | If new MTU is less than route PMTU, this new MTU will be the | |
2564 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2565 | decreases; if new MTU is greater than route PMTU, and the | |
2566 | old MTU is the lowest MTU in the path, update the route PMTU | |
2567 | to reflect the increase. In this case if the other nodes' MTU | |
2568 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2569 | PMTU discouvery. | |
2570 | */ | |
d1918542 | 2571 | if (rt->dst.dev == arg->dev && |
4b32b5ad MKL |
2572 | !dst_metric_locked(&rt->dst, RTAX_MTU)) { |
2573 | if (rt->rt6i_flags & RTF_CACHE) { | |
2574 | /* For RTF_CACHE with rt6i_pmtu == 0 | |
2575 | * (i.e. a redirected route), | |
2576 | * the metrics of its rt->dst.from has already | |
2577 | * been updated. | |
2578 | */ | |
2579 | if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu) | |
2580 | rt->rt6i_pmtu = arg->mtu; | |
2581 | } else if (dst_mtu(&rt->dst) >= arg->mtu || | |
2582 | (dst_mtu(&rt->dst) < arg->mtu && | |
2583 | dst_mtu(&rt->dst) == idev->cnf.mtu6)) { | |
2584 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); | |
2585 | } | |
566cfd8f | 2586 | } |
1da177e4 LT |
2587 | return 0; |
2588 | } | |
2589 | ||
95c96174 | 2590 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2591 | { |
c71099ac TG |
2592 | struct rt6_mtu_change_arg arg = { |
2593 | .dev = dev, | |
2594 | .mtu = mtu, | |
2595 | }; | |
1da177e4 | 2596 | |
0c3584d5 | 2597 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2598 | } |
2599 | ||
ef7c79ed | 2600 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2601 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2602 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2603 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2604 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2605 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2606 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
c78ba6d6 | 2607 | [RTA_PREF] = { .type = NLA_U8 }, |
19e42e45 RP |
2608 | [RTA_ENCAP_TYPE] = { .type = NLA_U16 }, |
2609 | [RTA_ENCAP] = { .type = NLA_NESTED }, | |
86872cb5 TG |
2610 | }; |
2611 | ||
2612 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2613 | struct fib6_config *cfg) | |
1da177e4 | 2614 | { |
86872cb5 TG |
2615 | struct rtmsg *rtm; |
2616 | struct nlattr *tb[RTA_MAX+1]; | |
c78ba6d6 | 2617 | unsigned int pref; |
86872cb5 | 2618 | int err; |
1da177e4 | 2619 | |
86872cb5 TG |
2620 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2621 | if (err < 0) | |
2622 | goto errout; | |
1da177e4 | 2623 | |
86872cb5 TG |
2624 | err = -EINVAL; |
2625 | rtm = nlmsg_data(nlh); | |
2626 | memset(cfg, 0, sizeof(*cfg)); | |
2627 | ||
2628 | cfg->fc_table = rtm->rtm_table; | |
2629 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2630 | cfg->fc_src_len = rtm->rtm_src_len; | |
2631 | cfg->fc_flags = RTF_UP; | |
2632 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2633 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2634 | |
ef2c7d7b ND |
2635 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2636 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2637 | rtm->rtm_type == RTN_PROHIBIT || |
2638 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2639 | cfg->fc_flags |= RTF_REJECT; |
2640 | ||
ab79ad14 MŻ |
2641 | if (rtm->rtm_type == RTN_LOCAL) |
2642 | cfg->fc_flags |= RTF_LOCAL; | |
2643 | ||
1f56a01f MKL |
2644 | if (rtm->rtm_flags & RTM_F_CLONED) |
2645 | cfg->fc_flags |= RTF_CACHE; | |
2646 | ||
15e47304 | 2647 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2648 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2649 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2650 | |
2651 | if (tb[RTA_GATEWAY]) { | |
67b61f6c | 2652 | cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]); |
86872cb5 | 2653 | cfg->fc_flags |= RTF_GATEWAY; |
1da177e4 | 2654 | } |
86872cb5 TG |
2655 | |
2656 | if (tb[RTA_DST]) { | |
2657 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2658 | ||
2659 | if (nla_len(tb[RTA_DST]) < plen) | |
2660 | goto errout; | |
2661 | ||
2662 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2663 | } |
86872cb5 TG |
2664 | |
2665 | if (tb[RTA_SRC]) { | |
2666 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2667 | ||
2668 | if (nla_len(tb[RTA_SRC]) < plen) | |
2669 | goto errout; | |
2670 | ||
2671 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2672 | } |
86872cb5 | 2673 | |
c3968a85 | 2674 | if (tb[RTA_PREFSRC]) |
67b61f6c | 2675 | cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]); |
c3968a85 | 2676 | |
86872cb5 TG |
2677 | if (tb[RTA_OIF]) |
2678 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2679 | ||
2680 | if (tb[RTA_PRIORITY]) | |
2681 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2682 | ||
2683 | if (tb[RTA_METRICS]) { | |
2684 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2685 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2686 | } |
86872cb5 TG |
2687 | |
2688 | if (tb[RTA_TABLE]) | |
2689 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2690 | ||
51ebd318 ND |
2691 | if (tb[RTA_MULTIPATH]) { |
2692 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2693 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2694 | } | |
2695 | ||
c78ba6d6 LR |
2696 | if (tb[RTA_PREF]) { |
2697 | pref = nla_get_u8(tb[RTA_PREF]); | |
2698 | if (pref != ICMPV6_ROUTER_PREF_LOW && | |
2699 | pref != ICMPV6_ROUTER_PREF_HIGH) | |
2700 | pref = ICMPV6_ROUTER_PREF_MEDIUM; | |
2701 | cfg->fc_flags |= RTF_PREF(pref); | |
2702 | } | |
2703 | ||
19e42e45 RP |
2704 | if (tb[RTA_ENCAP]) |
2705 | cfg->fc_encap = tb[RTA_ENCAP]; | |
2706 | ||
2707 | if (tb[RTA_ENCAP_TYPE]) | |
2708 | cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]); | |
2709 | ||
86872cb5 TG |
2710 | err = 0; |
2711 | errout: | |
2712 | return err; | |
1da177e4 LT |
2713 | } |
2714 | ||
51ebd318 ND |
2715 | static int ip6_route_multipath(struct fib6_config *cfg, int add) |
2716 | { | |
2717 | struct fib6_config r_cfg; | |
2718 | struct rtnexthop *rtnh; | |
2719 | int remaining; | |
2720 | int attrlen; | |
2721 | int err = 0, last_err = 0; | |
2722 | ||
35f1b4e9 | 2723 | remaining = cfg->fc_mp_len; |
51ebd318 ND |
2724 | beginning: |
2725 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
51ebd318 ND |
2726 | |
2727 | /* Parse a Multipath Entry */ | |
2728 | while (rtnh_ok(rtnh, remaining)) { | |
2729 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2730 | if (rtnh->rtnh_ifindex) | |
2731 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2732 | ||
2733 | attrlen = rtnh_attrlen(rtnh); | |
2734 | if (attrlen > 0) { | |
2735 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2736 | ||
2737 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2738 | if (nla) { | |
67b61f6c | 2739 | r_cfg.fc_gateway = nla_get_in6_addr(nla); |
51ebd318 ND |
2740 | r_cfg.fc_flags |= RTF_GATEWAY; |
2741 | } | |
19e42e45 RP |
2742 | r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP); |
2743 | nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE); | |
2744 | if (nla) | |
2745 | r_cfg.fc_encap_type = nla_get_u16(nla); | |
51ebd318 ND |
2746 | } |
2747 | err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); | |
2748 | if (err) { | |
2749 | last_err = err; | |
2750 | /* If we are trying to remove a route, do not stop the | |
2751 | * loop when ip6_route_del() fails (because next hop is | |
2752 | * already gone), we should try to remove all next hops. | |
2753 | */ | |
2754 | if (add) { | |
2755 | /* If add fails, we should try to delete all | |
2756 | * next hops that have been already added. | |
2757 | */ | |
2758 | add = 0; | |
35f1b4e9 | 2759 | remaining = cfg->fc_mp_len - remaining; |
51ebd318 ND |
2760 | goto beginning; |
2761 | } | |
2762 | } | |
1a72418b | 2763 | /* Because each route is added like a single route we remove |
27596472 MK |
2764 | * these flags after the first nexthop: if there is a collision, |
2765 | * we have already failed to add the first nexthop: | |
2766 | * fib6_add_rt2node() has rejected it; when replacing, old | |
2767 | * nexthops have been replaced by first new, the rest should | |
2768 | * be added to it. | |
1a72418b | 2769 | */ |
27596472 MK |
2770 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL | |
2771 | NLM_F_REPLACE); | |
51ebd318 ND |
2772 | rtnh = rtnh_next(rtnh, &remaining); |
2773 | } | |
2774 | ||
2775 | return last_err; | |
2776 | } | |
2777 | ||
67ba4152 | 2778 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2779 | { |
86872cb5 TG |
2780 | struct fib6_config cfg; |
2781 | int err; | |
1da177e4 | 2782 | |
86872cb5 TG |
2783 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2784 | if (err < 0) | |
2785 | return err; | |
2786 | ||
51ebd318 ND |
2787 | if (cfg.fc_mp) |
2788 | return ip6_route_multipath(&cfg, 0); | |
2789 | else | |
2790 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2791 | } |
2792 | ||
67ba4152 | 2793 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 2794 | { |
86872cb5 TG |
2795 | struct fib6_config cfg; |
2796 | int err; | |
1da177e4 | 2797 | |
86872cb5 TG |
2798 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2799 | if (err < 0) | |
2800 | return err; | |
2801 | ||
51ebd318 ND |
2802 | if (cfg.fc_mp) |
2803 | return ip6_route_multipath(&cfg, 1); | |
2804 | else | |
2805 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2806 | } |
2807 | ||
19e42e45 | 2808 | static inline size_t rt6_nlmsg_size(struct rt6_info *rt) |
339bf98f TG |
2809 | { |
2810 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2811 | + nla_total_size(16) /* RTA_SRC */ | |
2812 | + nla_total_size(16) /* RTA_DST */ | |
2813 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2814 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2815 | + nla_total_size(4) /* RTA_TABLE */ | |
2816 | + nla_total_size(4) /* RTA_IIF */ | |
2817 | + nla_total_size(4) /* RTA_OIF */ | |
2818 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2819 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
ea697639 | 2820 | + nla_total_size(sizeof(struct rta_cacheinfo)) |
c78ba6d6 | 2821 | + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */ |
19e42e45 RP |
2822 | + nla_total_size(1) /* RTA_PREF */ |
2823 | + lwtunnel_get_encap_size(rt->rt6i_lwtstate); | |
339bf98f TG |
2824 | } |
2825 | ||
191cd582 BH |
2826 | static int rt6_fill_node(struct net *net, |
2827 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2828 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2829 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2830 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 2831 | { |
4b32b5ad | 2832 | u32 metrics[RTAX_MAX]; |
1da177e4 | 2833 | struct rtmsg *rtm; |
2d7202bf | 2834 | struct nlmsghdr *nlh; |
e3703b3d | 2835 | long expires; |
9e762a4a | 2836 | u32 table; |
1da177e4 LT |
2837 | |
2838 | if (prefix) { /* user wants prefix routes only */ | |
2839 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2840 | /* success since this is not a prefix route */ | |
2841 | return 1; | |
2842 | } | |
2843 | } | |
2844 | ||
15e47304 | 2845 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2846 | if (!nlh) |
26932566 | 2847 | return -EMSGSIZE; |
2d7202bf TG |
2848 | |
2849 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2850 | rtm->rtm_family = AF_INET6; |
2851 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2852 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2853 | rtm->rtm_tos = 0; | |
c71099ac | 2854 | if (rt->rt6i_table) |
9e762a4a | 2855 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2856 | else |
9e762a4a PM |
2857 | table = RT6_TABLE_UNSPEC; |
2858 | rtm->rtm_table = table; | |
c78679e8 DM |
2859 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2860 | goto nla_put_failure; | |
ef2c7d7b ND |
2861 | if (rt->rt6i_flags & RTF_REJECT) { |
2862 | switch (rt->dst.error) { | |
2863 | case -EINVAL: | |
2864 | rtm->rtm_type = RTN_BLACKHOLE; | |
2865 | break; | |
2866 | case -EACCES: | |
2867 | rtm->rtm_type = RTN_PROHIBIT; | |
2868 | break; | |
b4949ab2 ND |
2869 | case -EAGAIN: |
2870 | rtm->rtm_type = RTN_THROW; | |
2871 | break; | |
ef2c7d7b ND |
2872 | default: |
2873 | rtm->rtm_type = RTN_UNREACHABLE; | |
2874 | break; | |
2875 | } | |
2876 | } | |
38308473 | 2877 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2878 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2879 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2880 | rtm->rtm_type = RTN_LOCAL; |
2881 | else | |
2882 | rtm->rtm_type = RTN_UNICAST; | |
2883 | rtm->rtm_flags = 0; | |
2884 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2885 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2886 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2887 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2888 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2889 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2890 | rtm->rtm_protocol = RTPROT_RA; | |
2891 | else | |
2892 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2893 | } | |
1da177e4 | 2894 | |
38308473 | 2895 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2896 | rtm->rtm_flags |= RTM_F_CLONED; |
2897 | ||
2898 | if (dst) { | |
930345ea | 2899 | if (nla_put_in6_addr(skb, RTA_DST, dst)) |
c78679e8 | 2900 | goto nla_put_failure; |
1ab1457c | 2901 | rtm->rtm_dst_len = 128; |
1da177e4 | 2902 | } else if (rtm->rtm_dst_len) |
930345ea | 2903 | if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr)) |
c78679e8 | 2904 | goto nla_put_failure; |
1da177e4 LT |
2905 | #ifdef CONFIG_IPV6_SUBTREES |
2906 | if (src) { | |
930345ea | 2907 | if (nla_put_in6_addr(skb, RTA_SRC, src)) |
c78679e8 | 2908 | goto nla_put_failure; |
1ab1457c | 2909 | rtm->rtm_src_len = 128; |
c78679e8 | 2910 | } else if (rtm->rtm_src_len && |
930345ea | 2911 | nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr)) |
c78679e8 | 2912 | goto nla_put_failure; |
1da177e4 | 2913 | #endif |
7bc570c8 YH |
2914 | if (iif) { |
2915 | #ifdef CONFIG_IPV6_MROUTE | |
2916 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2917 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2918 | if (err <= 0) { |
2919 | if (!nowait) { | |
2920 | if (err == 0) | |
2921 | return 0; | |
2922 | goto nla_put_failure; | |
2923 | } else { | |
2924 | if (err == -EMSGSIZE) | |
2925 | goto nla_put_failure; | |
2926 | } | |
2927 | } | |
2928 | } else | |
2929 | #endif | |
c78679e8 DM |
2930 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2931 | goto nla_put_failure; | |
7bc570c8 | 2932 | } else if (dst) { |
1da177e4 | 2933 | struct in6_addr saddr_buf; |
c78679e8 | 2934 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
930345ea | 2935 | nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 2936 | goto nla_put_failure; |
1da177e4 | 2937 | } |
2d7202bf | 2938 | |
c3968a85 DW |
2939 | if (rt->rt6i_prefsrc.plen) { |
2940 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2941 | saddr_buf = rt->rt6i_prefsrc.addr; |
930345ea | 2942 | if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf)) |
c78679e8 | 2943 | goto nla_put_failure; |
c3968a85 DW |
2944 | } |
2945 | ||
4b32b5ad MKL |
2946 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
2947 | if (rt->rt6i_pmtu) | |
2948 | metrics[RTAX_MTU - 1] = rt->rt6i_pmtu; | |
2949 | if (rtnetlink_put_metrics(skb, metrics) < 0) | |
2d7202bf TG |
2950 | goto nla_put_failure; |
2951 | ||
dd0cbf29 | 2952 | if (rt->rt6i_flags & RTF_GATEWAY) { |
930345ea | 2953 | if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0) |
94f826b8 | 2954 | goto nla_put_failure; |
94f826b8 | 2955 | } |
2d7202bf | 2956 | |
c78679e8 DM |
2957 | if (rt->dst.dev && |
2958 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2959 | goto nla_put_failure; | |
2960 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2961 | goto nla_put_failure; | |
8253947e LW |
2962 | |
2963 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2964 | |
87a50699 | 2965 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2966 | goto nla_put_failure; |
2d7202bf | 2967 | |
c78ba6d6 LR |
2968 | if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags))) |
2969 | goto nla_put_failure; | |
2970 | ||
19e42e45 RP |
2971 | lwtunnel_fill_encap(skb, rt->rt6i_lwtstate); |
2972 | ||
053c095a JB |
2973 | nlmsg_end(skb, nlh); |
2974 | return 0; | |
2d7202bf TG |
2975 | |
2976 | nla_put_failure: | |
26932566 PM |
2977 | nlmsg_cancel(skb, nlh); |
2978 | return -EMSGSIZE; | |
1da177e4 LT |
2979 | } |
2980 | ||
1b43af54 | 2981 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2982 | { |
2983 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2984 | int prefix; | |
2985 | ||
2d7202bf TG |
2986 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2987 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2988 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2989 | } else | |
2990 | prefix = 0; | |
2991 | ||
191cd582 BH |
2992 | return rt6_fill_node(arg->net, |
2993 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2994 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2995 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2996 | } |
2997 | ||
67ba4152 | 2998 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) |
1da177e4 | 2999 | { |
3b1e0a65 | 3000 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
3001 | struct nlattr *tb[RTA_MAX+1]; |
3002 | struct rt6_info *rt; | |
1da177e4 | 3003 | struct sk_buff *skb; |
ab364a6f | 3004 | struct rtmsg *rtm; |
4c9483b2 | 3005 | struct flowi6 fl6; |
72331bc0 | 3006 | int err, iif = 0, oif = 0; |
1da177e4 | 3007 | |
ab364a6f TG |
3008 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
3009 | if (err < 0) | |
3010 | goto errout; | |
1da177e4 | 3011 | |
ab364a6f | 3012 | err = -EINVAL; |
4c9483b2 | 3013 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 3014 | |
ab364a6f TG |
3015 | if (tb[RTA_SRC]) { |
3016 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
3017 | goto errout; | |
3018 | ||
4e3fd7a0 | 3019 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
3020 | } |
3021 | ||
3022 | if (tb[RTA_DST]) { | |
3023 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
3024 | goto errout; | |
3025 | ||
4e3fd7a0 | 3026 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
3027 | } |
3028 | ||
3029 | if (tb[RTA_IIF]) | |
3030 | iif = nla_get_u32(tb[RTA_IIF]); | |
3031 | ||
3032 | if (tb[RTA_OIF]) | |
72331bc0 | 3033 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 | 3034 | |
2e47b291 LC |
3035 | if (tb[RTA_MARK]) |
3036 | fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); | |
3037 | ||
1da177e4 LT |
3038 | if (iif) { |
3039 | struct net_device *dev; | |
72331bc0 SL |
3040 | int flags = 0; |
3041 | ||
5578689a | 3042 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
3043 | if (!dev) { |
3044 | err = -ENODEV; | |
ab364a6f | 3045 | goto errout; |
1da177e4 | 3046 | } |
72331bc0 SL |
3047 | |
3048 | fl6.flowi6_iif = iif; | |
3049 | ||
3050 | if (!ipv6_addr_any(&fl6.saddr)) | |
3051 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
3052 | ||
3053 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
3054 | flags); | |
3055 | } else { | |
3056 | fl6.flowi6_oif = oif; | |
3057 | ||
3058 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
3059 | } |
3060 | ||
ab364a6f | 3061 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 3062 | if (!skb) { |
94e187c0 | 3063 | ip6_rt_put(rt); |
ab364a6f TG |
3064 | err = -ENOBUFS; |
3065 | goto errout; | |
3066 | } | |
1da177e4 | 3067 | |
ab364a6f TG |
3068 | /* Reserve room for dummy headers, this skb can pass |
3069 | through good chunk of routing engine. | |
3070 | */ | |
459a98ed | 3071 | skb_reset_mac_header(skb); |
ab364a6f | 3072 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 3073 | |
d8d1f30b | 3074 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 3075 | |
4c9483b2 | 3076 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 3077 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 3078 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 3079 | if (err < 0) { |
ab364a6f TG |
3080 | kfree_skb(skb); |
3081 | goto errout; | |
1da177e4 LT |
3082 | } |
3083 | ||
15e47304 | 3084 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 3085 | errout: |
1da177e4 | 3086 | return err; |
1da177e4 LT |
3087 | } |
3088 | ||
86872cb5 | 3089 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
3090 | { |
3091 | struct sk_buff *skb; | |
5578689a | 3092 | struct net *net = info->nl_net; |
528c4ceb DL |
3093 | u32 seq; |
3094 | int err; | |
3095 | ||
3096 | err = -ENOBUFS; | |
38308473 | 3097 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 3098 | |
19e42e45 | 3099 | skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any()); |
38308473 | 3100 | if (!skb) |
21713ebc TG |
3101 | goto errout; |
3102 | ||
191cd582 | 3103 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 3104 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
3105 | if (err < 0) { |
3106 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
3107 | WARN_ON(err == -EMSGSIZE); | |
3108 | kfree_skb(skb); | |
3109 | goto errout; | |
3110 | } | |
15e47304 | 3111 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
3112 | info->nlh, gfp_any()); |
3113 | return; | |
21713ebc TG |
3114 | errout: |
3115 | if (err < 0) | |
5578689a | 3116 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
3117 | } |
3118 | ||
8ed67789 | 3119 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 3120 | unsigned long event, void *ptr) |
8ed67789 | 3121 | { |
351638e7 | 3122 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 3123 | struct net *net = dev_net(dev); |
8ed67789 DL |
3124 | |
3125 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 3126 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
3127 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
3128 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3129 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 3130 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 3131 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
3132 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
3133 | #endif | |
3134 | } | |
3135 | ||
3136 | return NOTIFY_OK; | |
3137 | } | |
3138 | ||
1da177e4 LT |
3139 | /* |
3140 | * /proc | |
3141 | */ | |
3142 | ||
3143 | #ifdef CONFIG_PROC_FS | |
3144 | ||
33120b30 AD |
3145 | static const struct file_operations ipv6_route_proc_fops = { |
3146 | .owner = THIS_MODULE, | |
3147 | .open = ipv6_route_open, | |
3148 | .read = seq_read, | |
3149 | .llseek = seq_lseek, | |
8d2ca1d7 | 3150 | .release = seq_release_net, |
33120b30 AD |
3151 | }; |
3152 | ||
1da177e4 LT |
3153 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
3154 | { | |
69ddb805 | 3155 | struct net *net = (struct net *)seq->private; |
1da177e4 | 3156 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
3157 | net->ipv6.rt6_stats->fib_nodes, |
3158 | net->ipv6.rt6_stats->fib_route_nodes, | |
3159 | net->ipv6.rt6_stats->fib_rt_alloc, | |
3160 | net->ipv6.rt6_stats->fib_rt_entries, | |
3161 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 3162 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 3163 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
3164 | |
3165 | return 0; | |
3166 | } | |
3167 | ||
3168 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
3169 | { | |
de05c557 | 3170 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
3171 | } |
3172 | ||
9a32144e | 3173 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
3174 | .owner = THIS_MODULE, |
3175 | .open = rt6_stats_seq_open, | |
3176 | .read = seq_read, | |
3177 | .llseek = seq_lseek, | |
b6fcbdb4 | 3178 | .release = single_release_net, |
1da177e4 LT |
3179 | }; |
3180 | #endif /* CONFIG_PROC_FS */ | |
3181 | ||
3182 | #ifdef CONFIG_SYSCTL | |
3183 | ||
1da177e4 | 3184 | static |
fe2c6338 | 3185 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
3186 | void __user *buffer, size_t *lenp, loff_t *ppos) |
3187 | { | |
c486da34 LAG |
3188 | struct net *net; |
3189 | int delay; | |
3190 | if (!write) | |
1da177e4 | 3191 | return -EINVAL; |
c486da34 LAG |
3192 | |
3193 | net = (struct net *)ctl->extra1; | |
3194 | delay = net->ipv6.sysctl.flush_delay; | |
3195 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 3196 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 3197 | return 0; |
1da177e4 LT |
3198 | } |
3199 | ||
fe2c6338 | 3200 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 3201 | { |
1da177e4 | 3202 | .procname = "flush", |
4990509f | 3203 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 3204 | .maxlen = sizeof(int), |
89c8b3a1 | 3205 | .mode = 0200, |
6d9f239a | 3206 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
3207 | }, |
3208 | { | |
1da177e4 | 3209 | .procname = "gc_thresh", |
9a7ec3a9 | 3210 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
3211 | .maxlen = sizeof(int), |
3212 | .mode = 0644, | |
6d9f239a | 3213 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3214 | }, |
3215 | { | |
1da177e4 | 3216 | .procname = "max_size", |
4990509f | 3217 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
3218 | .maxlen = sizeof(int), |
3219 | .mode = 0644, | |
6d9f239a | 3220 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3221 | }, |
3222 | { | |
1da177e4 | 3223 | .procname = "gc_min_interval", |
4990509f | 3224 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3225 | .maxlen = sizeof(int), |
3226 | .mode = 0644, | |
6d9f239a | 3227 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3228 | }, |
3229 | { | |
1da177e4 | 3230 | .procname = "gc_timeout", |
4990509f | 3231 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
3232 | .maxlen = sizeof(int), |
3233 | .mode = 0644, | |
6d9f239a | 3234 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3235 | }, |
3236 | { | |
1da177e4 | 3237 | .procname = "gc_interval", |
4990509f | 3238 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
3239 | .maxlen = sizeof(int), |
3240 | .mode = 0644, | |
6d9f239a | 3241 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3242 | }, |
3243 | { | |
1da177e4 | 3244 | .procname = "gc_elasticity", |
4990509f | 3245 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
3246 | .maxlen = sizeof(int), |
3247 | .mode = 0644, | |
f3d3f616 | 3248 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3249 | }, |
3250 | { | |
1da177e4 | 3251 | .procname = "mtu_expires", |
4990509f | 3252 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
3253 | .maxlen = sizeof(int), |
3254 | .mode = 0644, | |
6d9f239a | 3255 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3256 | }, |
3257 | { | |
1da177e4 | 3258 | .procname = "min_adv_mss", |
4990509f | 3259 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
3260 | .maxlen = sizeof(int), |
3261 | .mode = 0644, | |
f3d3f616 | 3262 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3263 | }, |
3264 | { | |
1da177e4 | 3265 | .procname = "gc_min_interval_ms", |
4990509f | 3266 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
3267 | .maxlen = sizeof(int), |
3268 | .mode = 0644, | |
6d9f239a | 3269 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 3270 | }, |
f8572d8f | 3271 | { } |
1da177e4 LT |
3272 | }; |
3273 | ||
2c8c1e72 | 3274 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
3275 | { |
3276 | struct ctl_table *table; | |
3277 | ||
3278 | table = kmemdup(ipv6_route_table_template, | |
3279 | sizeof(ipv6_route_table_template), | |
3280 | GFP_KERNEL); | |
5ee09105 YH |
3281 | |
3282 | if (table) { | |
3283 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 3284 | table[0].extra1 = net; |
86393e52 | 3285 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
3286 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
3287 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
3288 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
3289 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
3290 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
3291 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
3292 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 3293 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
3294 | |
3295 | /* Don't export sysctls to unprivileged users */ | |
3296 | if (net->user_ns != &init_user_ns) | |
3297 | table[0].procname = NULL; | |
5ee09105 YH |
3298 | } |
3299 | ||
760f2d01 DL |
3300 | return table; |
3301 | } | |
1da177e4 LT |
3302 | #endif |
3303 | ||
2c8c1e72 | 3304 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3305 | { |
633d424b | 3306 | int ret = -ENOMEM; |
8ed67789 | 3307 | |
86393e52 AD |
3308 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3309 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3310 | |
fc66f95c ED |
3311 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3312 | goto out_ip6_dst_ops; | |
3313 | ||
8ed67789 DL |
3314 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3315 | sizeof(*net->ipv6.ip6_null_entry), | |
3316 | GFP_KERNEL); | |
3317 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3318 | goto out_ip6_dst_entries; |
d8d1f30b | 3319 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3320 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3321 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3322 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3323 | ip6_template_metrics, true); | |
8ed67789 DL |
3324 | |
3325 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3326 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3327 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3328 | GFP_KERNEL); | |
68fffc67 PZ |
3329 | if (!net->ipv6.ip6_prohibit_entry) |
3330 | goto out_ip6_null_entry; | |
d8d1f30b | 3331 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3332 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3333 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3334 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3335 | ip6_template_metrics, true); | |
8ed67789 DL |
3336 | |
3337 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3338 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3339 | GFP_KERNEL); | |
68fffc67 PZ |
3340 | if (!net->ipv6.ip6_blk_hole_entry) |
3341 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3342 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3343 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3344 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3345 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3346 | ip6_template_metrics, true); | |
8ed67789 DL |
3347 | #endif |
3348 | ||
b339a47c PZ |
3349 | net->ipv6.sysctl.flush_delay = 0; |
3350 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3351 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3352 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3353 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3354 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3355 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3356 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3357 | ||
6891a346 BT |
3358 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3359 | ||
8ed67789 DL |
3360 | ret = 0; |
3361 | out: | |
3362 | return ret; | |
f2fc6a54 | 3363 | |
68fffc67 PZ |
3364 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3365 | out_ip6_prohibit_entry: | |
3366 | kfree(net->ipv6.ip6_prohibit_entry); | |
3367 | out_ip6_null_entry: | |
3368 | kfree(net->ipv6.ip6_null_entry); | |
3369 | #endif | |
fc66f95c ED |
3370 | out_ip6_dst_entries: |
3371 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3372 | out_ip6_dst_ops: |
f2fc6a54 | 3373 | goto out; |
cdb18761 DL |
3374 | } |
3375 | ||
2c8c1e72 | 3376 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3377 | { |
8ed67789 DL |
3378 | kfree(net->ipv6.ip6_null_entry); |
3379 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3380 | kfree(net->ipv6.ip6_prohibit_entry); | |
3381 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3382 | #endif | |
41bb78b4 | 3383 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3384 | } |
3385 | ||
d189634e TG |
3386 | static int __net_init ip6_route_net_init_late(struct net *net) |
3387 | { | |
3388 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3389 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3390 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3391 | #endif |
3392 | return 0; | |
3393 | } | |
3394 | ||
3395 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3396 | { | |
3397 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3398 | remove_proc_entry("ipv6_route", net->proc_net); |
3399 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3400 | #endif |
3401 | } | |
3402 | ||
cdb18761 DL |
3403 | static struct pernet_operations ip6_route_net_ops = { |
3404 | .init = ip6_route_net_init, | |
3405 | .exit = ip6_route_net_exit, | |
3406 | }; | |
3407 | ||
c3426b47 DM |
3408 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3409 | { | |
3410 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3411 | ||
3412 | if (!bp) | |
3413 | return -ENOMEM; | |
3414 | inet_peer_base_init(bp); | |
3415 | net->ipv6.peers = bp; | |
3416 | return 0; | |
3417 | } | |
3418 | ||
3419 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3420 | { | |
3421 | struct inet_peer_base *bp = net->ipv6.peers; | |
3422 | ||
3423 | net->ipv6.peers = NULL; | |
56a6b248 | 3424 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3425 | kfree(bp); |
3426 | } | |
3427 | ||
2b823f72 | 3428 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3429 | .init = ipv6_inetpeer_init, |
3430 | .exit = ipv6_inetpeer_exit, | |
3431 | }; | |
3432 | ||
d189634e TG |
3433 | static struct pernet_operations ip6_route_net_late_ops = { |
3434 | .init = ip6_route_net_init_late, | |
3435 | .exit = ip6_route_net_exit_late, | |
3436 | }; | |
3437 | ||
8ed67789 DL |
3438 | static struct notifier_block ip6_route_dev_notifier = { |
3439 | .notifier_call = ip6_route_dev_notify, | |
3440 | .priority = 0, | |
3441 | }; | |
3442 | ||
433d49c3 | 3443 | int __init ip6_route_init(void) |
1da177e4 | 3444 | { |
433d49c3 | 3445 | int ret; |
8d0b94af | 3446 | int cpu; |
433d49c3 | 3447 | |
9a7ec3a9 DL |
3448 | ret = -ENOMEM; |
3449 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3450 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3451 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3452 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3453 | goto out; |
14e50e57 | 3454 | |
fc66f95c | 3455 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3456 | if (ret) |
bdb3289f | 3457 | goto out_kmem_cache; |
bdb3289f | 3458 | |
c3426b47 DM |
3459 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3460 | if (ret) | |
e8803b6c | 3461 | goto out_dst_entries; |
2a0c451a | 3462 | |
7e52b33b DM |
3463 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3464 | if (ret) | |
3465 | goto out_register_inetpeer; | |
c3426b47 | 3466 | |
5dc121e9 AE |
3467 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3468 | ||
8ed67789 DL |
3469 | /* Registering of the loopback is done before this portion of code, |
3470 | * the loopback reference in rt6_info will not be taken, do it | |
3471 | * manually for init_net */ | |
d8d1f30b | 3472 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3473 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3474 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3475 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3476 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3477 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3478 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3479 | #endif | |
e8803b6c | 3480 | ret = fib6_init(); |
433d49c3 | 3481 | if (ret) |
8ed67789 | 3482 | goto out_register_subsys; |
433d49c3 | 3483 | |
433d49c3 DL |
3484 | ret = xfrm6_init(); |
3485 | if (ret) | |
e8803b6c | 3486 | goto out_fib6_init; |
c35b7e72 | 3487 | |
433d49c3 DL |
3488 | ret = fib6_rules_init(); |
3489 | if (ret) | |
3490 | goto xfrm6_init; | |
7e5449c2 | 3491 | |
d189634e TG |
3492 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3493 | if (ret) | |
3494 | goto fib6_rules_init; | |
3495 | ||
433d49c3 | 3496 | ret = -ENOBUFS; |
c7ac8679 GR |
3497 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3498 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3499 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3500 | goto out_register_late_subsys; |
c127ea2c | 3501 | |
8ed67789 | 3502 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3503 | if (ret) |
d189634e | 3504 | goto out_register_late_subsys; |
8ed67789 | 3505 | |
8d0b94af MKL |
3506 | for_each_possible_cpu(cpu) { |
3507 | struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu); | |
3508 | ||
3509 | INIT_LIST_HEAD(&ul->head); | |
3510 | spin_lock_init(&ul->lock); | |
3511 | } | |
3512 | ||
433d49c3 DL |
3513 | out: |
3514 | return ret; | |
3515 | ||
d189634e TG |
3516 | out_register_late_subsys: |
3517 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3518 | fib6_rules_init: |
433d49c3 DL |
3519 | fib6_rules_cleanup(); |
3520 | xfrm6_init: | |
433d49c3 | 3521 | xfrm6_fini(); |
2a0c451a TG |
3522 | out_fib6_init: |
3523 | fib6_gc_cleanup(); | |
8ed67789 DL |
3524 | out_register_subsys: |
3525 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3526 | out_register_inetpeer: |
3527 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3528 | out_dst_entries: |
3529 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3530 | out_kmem_cache: |
f2fc6a54 | 3531 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3532 | goto out; |
1da177e4 LT |
3533 | } |
3534 | ||
3535 | void ip6_route_cleanup(void) | |
3536 | { | |
8ed67789 | 3537 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3538 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3539 | fib6_rules_cleanup(); |
1da177e4 | 3540 | xfrm6_fini(); |
1da177e4 | 3541 | fib6_gc_cleanup(); |
c3426b47 | 3542 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3543 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3544 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3545 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3546 | } |