Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
61 | |
62 | #include <asm/uaccess.h> | |
63 | ||
64 | #ifdef CONFIG_SYSCTL | |
65 | #include <linux/sysctl.h> | |
66 | #endif | |
67 | ||
1716a961 | 68 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 69 | const struct in6_addr *dest); |
1da177e4 | 70 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 71 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 72 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
73 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
74 | static void ip6_dst_destroy(struct dst_entry *); | |
75 | static void ip6_dst_ifdown(struct dst_entry *, | |
76 | struct net_device *dev, int how); | |
569d3645 | 77 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
78 | |
79 | static int ip6_pkt_discard(struct sk_buff *skb); | |
80 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
81 | static void ip6_link_failure(struct sk_buff *skb); | |
6700c270 DM |
82 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
83 | struct sk_buff *skb, u32 mtu); | |
84 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
85 | struct sk_buff *skb); | |
1da177e4 | 86 | |
70ceb4f5 | 87 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 88 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
89 | const struct in6_addr *prefix, int prefixlen, |
90 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 91 | unsigned int pref); |
efa2cea0 | 92 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
93 | const struct in6_addr *prefix, int prefixlen, |
94 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
95 | #endif |
96 | ||
06582540 DM |
97 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
98 | { | |
99 | struct rt6_info *rt = (struct rt6_info *) dst; | |
100 | struct inet_peer *peer; | |
101 | u32 *p = NULL; | |
102 | ||
8e2ec639 YZ |
103 | if (!(rt->dst.flags & DST_HOST)) |
104 | return NULL; | |
105 | ||
fbfe95a4 | 106 | peer = rt6_get_peer_create(rt); |
06582540 DM |
107 | if (peer) { |
108 | u32 *old_p = __DST_METRICS_PTR(old); | |
109 | unsigned long prev, new; | |
110 | ||
111 | p = peer->metrics; | |
112 | if (inet_metrics_new(peer)) | |
113 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
114 | ||
115 | new = (unsigned long) p; | |
116 | prev = cmpxchg(&dst->_metrics, old, new); | |
117 | ||
118 | if (prev != old) { | |
119 | p = __DST_METRICS_PTR(prev); | |
120 | if (prev & DST_METRICS_READ_ONLY) | |
121 | p = NULL; | |
122 | } | |
123 | } | |
124 | return p; | |
125 | } | |
126 | ||
f894cbf8 DM |
127 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
128 | struct sk_buff *skb, | |
129 | const void *daddr) | |
39232973 DM |
130 | { |
131 | struct in6_addr *p = &rt->rt6i_gateway; | |
132 | ||
a7563f34 | 133 | if (!ipv6_addr_any(p)) |
39232973 | 134 | return (const void *) p; |
f894cbf8 DM |
135 | else if (skb) |
136 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
137 | return daddr; |
138 | } | |
139 | ||
f894cbf8 DM |
140 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
141 | struct sk_buff *skb, | |
142 | const void *daddr) | |
d3aaeb38 | 143 | { |
39232973 DM |
144 | struct rt6_info *rt = (struct rt6_info *) dst; |
145 | struct neighbour *n; | |
146 | ||
f894cbf8 | 147 | daddr = choose_neigh_daddr(rt, skb, daddr); |
39232973 | 148 | n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); |
f83c7790 DM |
149 | if (n) |
150 | return n; | |
151 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
152 | } | |
153 | ||
8ade06c6 | 154 | static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev) |
f83c7790 | 155 | { |
8ade06c6 DM |
156 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway); |
157 | if (!n) { | |
158 | n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev); | |
159 | if (IS_ERR(n)) | |
160 | return PTR_ERR(n); | |
161 | } | |
97cac082 | 162 | rt->n = n; |
f83c7790 DM |
163 | |
164 | return 0; | |
d3aaeb38 DM |
165 | } |
166 | ||
9a7ec3a9 | 167 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 168 | .family = AF_INET6, |
09640e63 | 169 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
170 | .gc = ip6_dst_gc, |
171 | .gc_thresh = 1024, | |
172 | .check = ip6_dst_check, | |
0dbaee3b | 173 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 174 | .mtu = ip6_mtu, |
06582540 | 175 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
176 | .destroy = ip6_dst_destroy, |
177 | .ifdown = ip6_dst_ifdown, | |
178 | .negative_advice = ip6_negative_advice, | |
179 | .link_failure = ip6_link_failure, | |
180 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 181 | .redirect = rt6_do_redirect, |
1ac06e03 | 182 | .local_out = __ip6_local_out, |
d3aaeb38 | 183 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
184 | }; |
185 | ||
ebb762f2 | 186 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 187 | { |
618f9bc7 SK |
188 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
189 | ||
190 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
191 | } |
192 | ||
6700c270 DM |
193 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
194 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
195 | { |
196 | } | |
197 | ||
6700c270 DM |
198 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
199 | struct sk_buff *skb) | |
b587ee3b DM |
200 | { |
201 | } | |
202 | ||
0972ddb2 HB |
203 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
204 | unsigned long old) | |
205 | { | |
206 | return NULL; | |
207 | } | |
208 | ||
14e50e57 DM |
209 | static struct dst_ops ip6_dst_blackhole_ops = { |
210 | .family = AF_INET6, | |
09640e63 | 211 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
212 | .destroy = ip6_dst_destroy, |
213 | .check = ip6_dst_check, | |
ebb762f2 | 214 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 215 | .default_advmss = ip6_default_advmss, |
14e50e57 | 216 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 217 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 218 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 219 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
220 | }; |
221 | ||
62fa8a84 | 222 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 223 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
224 | }; |
225 | ||
fb0af4c7 | 226 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
227 | .dst = { |
228 | .__refcnt = ATOMIC_INIT(1), | |
229 | .__use = 1, | |
2c20cbd7 | 230 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 231 | .error = -ENETUNREACH, |
d8d1f30b CG |
232 | .input = ip6_pkt_discard, |
233 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
234 | }, |
235 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 236 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
237 | .rt6i_metric = ~(u32) 0, |
238 | .rt6i_ref = ATOMIC_INIT(1), | |
239 | }; | |
240 | ||
101367c2 TG |
241 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
242 | ||
6723ab54 DM |
243 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
244 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 245 | |
fb0af4c7 | 246 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
247 | .dst = { |
248 | .__refcnt = ATOMIC_INIT(1), | |
249 | .__use = 1, | |
2c20cbd7 | 250 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 251 | .error = -EACCES, |
d8d1f30b CG |
252 | .input = ip6_pkt_prohibit, |
253 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
254 | }, |
255 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 256 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
257 | .rt6i_metric = ~(u32) 0, |
258 | .rt6i_ref = ATOMIC_INIT(1), | |
259 | }; | |
260 | ||
fb0af4c7 | 261 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
262 | .dst = { |
263 | .__refcnt = ATOMIC_INIT(1), | |
264 | .__use = 1, | |
2c20cbd7 | 265 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 266 | .error = -EINVAL, |
d8d1f30b CG |
267 | .input = dst_discard, |
268 | .output = dst_discard, | |
101367c2 TG |
269 | }, |
270 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 271 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
272 | .rt6i_metric = ~(u32) 0, |
273 | .rt6i_ref = ATOMIC_INIT(1), | |
274 | }; | |
275 | ||
276 | #endif | |
277 | ||
1da177e4 | 278 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 279 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 280 | struct net_device *dev, |
8b96d22d DM |
281 | int flags, |
282 | struct fib6_table *table) | |
1da177e4 | 283 | { |
97bab73f | 284 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 285 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 286 | |
97bab73f | 287 | if (rt) { |
8104891b SK |
288 | struct dst_entry *dst = &rt->dst; |
289 | ||
290 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
8b96d22d | 291 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
6f3118b5 | 292 | rt->rt6i_genid = rt_genid(net); |
51ebd318 ND |
293 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
294 | rt->rt6i_nsiblings = 0; | |
97bab73f | 295 | } |
cf911662 | 296 | return rt; |
1da177e4 LT |
297 | } |
298 | ||
299 | static void ip6_dst_destroy(struct dst_entry *dst) | |
300 | { | |
301 | struct rt6_info *rt = (struct rt6_info *)dst; | |
302 | struct inet6_dev *idev = rt->rt6i_idev; | |
303 | ||
97cac082 DM |
304 | if (rt->n) |
305 | neigh_release(rt->n); | |
306 | ||
8e2ec639 YZ |
307 | if (!(rt->dst.flags & DST_HOST)) |
308 | dst_destroy_metrics_generic(dst); | |
309 | ||
38308473 | 310 | if (idev) { |
1da177e4 LT |
311 | rt->rt6i_idev = NULL; |
312 | in6_dev_put(idev); | |
1ab1457c | 313 | } |
1716a961 G |
314 | |
315 | if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from) | |
316 | dst_release(dst->from); | |
317 | ||
97bab73f DM |
318 | if (rt6_has_peer(rt)) { |
319 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
320 | inet_putpeer(peer); |
321 | } | |
322 | } | |
323 | ||
324 | void rt6_bind_peer(struct rt6_info *rt, int create) | |
325 | { | |
97bab73f | 326 | struct inet_peer_base *base; |
b3419363 DM |
327 | struct inet_peer *peer; |
328 | ||
97bab73f DM |
329 | base = inetpeer_base_ptr(rt->_rt6i_peer); |
330 | if (!base) | |
331 | return; | |
332 | ||
333 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
7b34ca2a DM |
334 | if (peer) { |
335 | if (!rt6_set_peer(rt, peer)) | |
336 | inet_putpeer(peer); | |
7b34ca2a | 337 | } |
1da177e4 LT |
338 | } |
339 | ||
340 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
341 | int how) | |
342 | { | |
343 | struct rt6_info *rt = (struct rt6_info *)dst; | |
344 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 345 | struct net_device *loopback_dev = |
c346dca1 | 346 | dev_net(dev)->loopback_dev; |
1da177e4 | 347 | |
97cac082 DM |
348 | if (dev != loopback_dev) { |
349 | if (idev && idev->dev == dev) { | |
350 | struct inet6_dev *loopback_idev = | |
351 | in6_dev_get(loopback_dev); | |
352 | if (loopback_idev) { | |
353 | rt->rt6i_idev = loopback_idev; | |
354 | in6_dev_put(idev); | |
355 | } | |
356 | } | |
357 | if (rt->n && rt->n->dev == dev) { | |
358 | rt->n->dev = loopback_dev; | |
359 | dev_hold(loopback_dev); | |
360 | dev_put(dev); | |
1da177e4 LT |
361 | } |
362 | } | |
363 | } | |
364 | ||
a50feda5 | 365 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 366 | { |
1716a961 G |
367 | if (rt->rt6i_flags & RTF_EXPIRES) { |
368 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 369 | return true; |
1716a961 | 370 | } else if (rt->dst.from) { |
3fd91fb3 | 371 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 372 | } |
a50feda5 | 373 | return false; |
1da177e4 LT |
374 | } |
375 | ||
a50feda5 | 376 | static bool rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 377 | { |
a02cec21 ED |
378 | return ipv6_addr_type(daddr) & |
379 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
380 | } |
381 | ||
51ebd318 ND |
382 | /* Multipath route selection: |
383 | * Hash based function using packet header and flowlabel. | |
384 | * Adapted from fib_info_hashfn() | |
385 | */ | |
386 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
387 | const struct flowi6 *fl6) | |
388 | { | |
389 | unsigned int val = fl6->flowi6_proto; | |
390 | ||
b3ce5ae1 ND |
391 | val ^= (__force u32)fl6->daddr.s6_addr32[0]; |
392 | val ^= (__force u32)fl6->daddr.s6_addr32[1]; | |
393 | val ^= (__force u32)fl6->daddr.s6_addr32[2]; | |
394 | val ^= (__force u32)fl6->daddr.s6_addr32[3]; | |
51ebd318 | 395 | |
b3ce5ae1 ND |
396 | val ^= (__force u32)fl6->saddr.s6_addr32[0]; |
397 | val ^= (__force u32)fl6->saddr.s6_addr32[1]; | |
398 | val ^= (__force u32)fl6->saddr.s6_addr32[2]; | |
399 | val ^= (__force u32)fl6->saddr.s6_addr32[3]; | |
51ebd318 ND |
400 | |
401 | /* Work only if this not encapsulated */ | |
402 | switch (fl6->flowi6_proto) { | |
403 | case IPPROTO_UDP: | |
404 | case IPPROTO_TCP: | |
405 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
406 | val ^= (__force u16)fl6->fl6_sport; |
407 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
408 | break; |
409 | ||
410 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
411 | val ^= (__force u16)fl6->fl6_icmp_type; |
412 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
413 | break; |
414 | } | |
415 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 416 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
417 | |
418 | /* Perhaps, we need to tune, this function? */ | |
419 | val = val ^ (val >> 7) ^ (val >> 12); | |
420 | return val % candidate_count; | |
421 | } | |
422 | ||
423 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
424 | struct flowi6 *fl6) | |
425 | { | |
426 | struct rt6_info *sibling, *next_sibling; | |
427 | int route_choosen; | |
428 | ||
429 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
430 | /* Don't change the route, if route_choosen == 0 | |
431 | * (siblings does not include ourself) | |
432 | */ | |
433 | if (route_choosen) | |
434 | list_for_each_entry_safe(sibling, next_sibling, | |
435 | &match->rt6i_siblings, rt6i_siblings) { | |
436 | route_choosen--; | |
437 | if (route_choosen == 0) { | |
438 | match = sibling; | |
439 | break; | |
440 | } | |
441 | } | |
442 | return match; | |
443 | } | |
444 | ||
1da177e4 | 445 | /* |
c71099ac | 446 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
447 | */ |
448 | ||
8ed67789 DL |
449 | static inline struct rt6_info *rt6_device_match(struct net *net, |
450 | struct rt6_info *rt, | |
b71d1d42 | 451 | const struct in6_addr *saddr, |
1da177e4 | 452 | int oif, |
d420895e | 453 | int flags) |
1da177e4 LT |
454 | { |
455 | struct rt6_info *local = NULL; | |
456 | struct rt6_info *sprt; | |
457 | ||
dd3abc4e YH |
458 | if (!oif && ipv6_addr_any(saddr)) |
459 | goto out; | |
460 | ||
d8d1f30b | 461 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 462 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
463 | |
464 | if (oif) { | |
1da177e4 LT |
465 | if (dev->ifindex == oif) |
466 | return sprt; | |
467 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 468 | if (!sprt->rt6i_idev || |
1da177e4 | 469 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 470 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 471 | continue; |
1ab1457c | 472 | if (local && (!oif || |
1da177e4 LT |
473 | local->rt6i_idev->dev->ifindex == oif)) |
474 | continue; | |
475 | } | |
476 | local = sprt; | |
477 | } | |
dd3abc4e YH |
478 | } else { |
479 | if (ipv6_chk_addr(net, saddr, dev, | |
480 | flags & RT6_LOOKUP_F_IFACE)) | |
481 | return sprt; | |
1da177e4 | 482 | } |
dd3abc4e | 483 | } |
1da177e4 | 484 | |
dd3abc4e | 485 | if (oif) { |
1da177e4 LT |
486 | if (local) |
487 | return local; | |
488 | ||
d420895e | 489 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 490 | return net->ipv6.ip6_null_entry; |
1da177e4 | 491 | } |
dd3abc4e | 492 | out: |
1da177e4 LT |
493 | return rt; |
494 | } | |
495 | ||
27097255 YH |
496 | #ifdef CONFIG_IPV6_ROUTER_PREF |
497 | static void rt6_probe(struct rt6_info *rt) | |
498 | { | |
f2c31e32 | 499 | struct neighbour *neigh; |
27097255 YH |
500 | /* |
501 | * Okay, this does not seem to be appropriate | |
502 | * for now, however, we need to check if it | |
503 | * is really so; aka Router Reachability Probing. | |
504 | * | |
505 | * Router Reachability Probe MUST be rate-limited | |
506 | * to no more than one per minute. | |
507 | */ | |
97cac082 | 508 | neigh = rt ? rt->n : NULL; |
27097255 | 509 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
fdd6681d | 510 | return; |
27097255 YH |
511 | read_lock_bh(&neigh->lock); |
512 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 513 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
514 | struct in6_addr mcaddr; |
515 | struct in6_addr *target; | |
516 | ||
517 | neigh->updated = jiffies; | |
518 | read_unlock_bh(&neigh->lock); | |
519 | ||
520 | target = (struct in6_addr *)&neigh->primary_key; | |
521 | addrconf_addr_solict_mult(target, &mcaddr); | |
d1918542 | 522 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 523 | } else { |
27097255 | 524 | read_unlock_bh(&neigh->lock); |
f2c31e32 | 525 | } |
27097255 YH |
526 | } |
527 | #else | |
528 | static inline void rt6_probe(struct rt6_info *rt) | |
529 | { | |
27097255 YH |
530 | } |
531 | #endif | |
532 | ||
1da177e4 | 533 | /* |
554cfb7e | 534 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 535 | */ |
b6f99a21 | 536 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 537 | { |
d1918542 | 538 | struct net_device *dev = rt->dst.dev; |
161980f4 | 539 | if (!oif || dev->ifindex == oif) |
554cfb7e | 540 | return 2; |
161980f4 DM |
541 | if ((dev->flags & IFF_LOOPBACK) && |
542 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
543 | return 1; | |
544 | return 0; | |
554cfb7e | 545 | } |
1da177e4 | 546 | |
a5a81f0b | 547 | static inline bool rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 548 | { |
f2c31e32 | 549 | struct neighbour *neigh; |
a5a81f0b | 550 | bool ret = false; |
f2c31e32 | 551 | |
97cac082 | 552 | neigh = rt->n; |
4d0c5911 YH |
553 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
554 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
a5a81f0b | 555 | ret = true; |
4d0c5911 | 556 | else if (neigh) { |
554cfb7e YH |
557 | read_lock_bh(&neigh->lock); |
558 | if (neigh->nud_state & NUD_VALID) | |
a5a81f0b | 559 | ret = true; |
398bcbeb | 560 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b PM |
561 | else if (!(neigh->nud_state & NUD_FAILED)) |
562 | ret = true; | |
398bcbeb | 563 | #endif |
554cfb7e | 564 | read_unlock_bh(&neigh->lock); |
a5a81f0b PM |
565 | } |
566 | return ret; | |
1da177e4 LT |
567 | } |
568 | ||
554cfb7e YH |
569 | static int rt6_score_route(struct rt6_info *rt, int oif, |
570 | int strict) | |
1da177e4 | 571 | { |
a5a81f0b | 572 | int m; |
1ab1457c | 573 | |
4d0c5911 | 574 | m = rt6_check_dev(rt, oif); |
77d16f45 | 575 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 576 | return -1; |
ebacaaa0 YH |
577 | #ifdef CONFIG_IPV6_ROUTER_PREF |
578 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
579 | #endif | |
a5a81f0b | 580 | if (!rt6_check_neigh(rt) && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
581 | return -1; |
582 | return m; | |
583 | } | |
584 | ||
f11e6659 DM |
585 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
586 | int *mpri, struct rt6_info *match) | |
554cfb7e | 587 | { |
f11e6659 DM |
588 | int m; |
589 | ||
590 | if (rt6_check_expired(rt)) | |
591 | goto out; | |
592 | ||
593 | m = rt6_score_route(rt, oif, strict); | |
594 | if (m < 0) | |
595 | goto out; | |
596 | ||
597 | if (m > *mpri) { | |
598 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
599 | rt6_probe(match); | |
600 | *mpri = m; | |
601 | match = rt; | |
602 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
603 | rt6_probe(rt); | |
604 | } | |
605 | ||
606 | out: | |
607 | return match; | |
608 | } | |
609 | ||
610 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
611 | struct rt6_info *rr_head, | |
612 | u32 metric, int oif, int strict) | |
613 | { | |
614 | struct rt6_info *rt, *match; | |
554cfb7e | 615 | int mpri = -1; |
1da177e4 | 616 | |
f11e6659 DM |
617 | match = NULL; |
618 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 619 | rt = rt->dst.rt6_next) |
f11e6659 DM |
620 | match = find_match(rt, oif, strict, &mpri, match); |
621 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 622 | rt = rt->dst.rt6_next) |
f11e6659 | 623 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 624 | |
f11e6659 DM |
625 | return match; |
626 | } | |
1da177e4 | 627 | |
f11e6659 DM |
628 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
629 | { | |
630 | struct rt6_info *match, *rt0; | |
8ed67789 | 631 | struct net *net; |
1da177e4 | 632 | |
f11e6659 DM |
633 | rt0 = fn->rr_ptr; |
634 | if (!rt0) | |
635 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 636 | |
f11e6659 | 637 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 638 | |
554cfb7e | 639 | if (!match && |
f11e6659 | 640 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 641 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 642 | |
554cfb7e | 643 | /* no entries matched; do round-robin */ |
f11e6659 DM |
644 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
645 | next = fn->leaf; | |
646 | ||
647 | if (next != rt0) | |
648 | fn->rr_ptr = next; | |
1da177e4 | 649 | } |
1da177e4 | 650 | |
d1918542 | 651 | net = dev_net(rt0->dst.dev); |
a02cec21 | 652 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
653 | } |
654 | ||
70ceb4f5 YH |
655 | #ifdef CONFIG_IPV6_ROUTE_INFO |
656 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 657 | const struct in6_addr *gwaddr) |
70ceb4f5 | 658 | { |
c346dca1 | 659 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
660 | struct route_info *rinfo = (struct route_info *) opt; |
661 | struct in6_addr prefix_buf, *prefix; | |
662 | unsigned int pref; | |
4bed72e4 | 663 | unsigned long lifetime; |
70ceb4f5 YH |
664 | struct rt6_info *rt; |
665 | ||
666 | if (len < sizeof(struct route_info)) { | |
667 | return -EINVAL; | |
668 | } | |
669 | ||
670 | /* Sanity check for prefix_len and length */ | |
671 | if (rinfo->length > 3) { | |
672 | return -EINVAL; | |
673 | } else if (rinfo->prefix_len > 128) { | |
674 | return -EINVAL; | |
675 | } else if (rinfo->prefix_len > 64) { | |
676 | if (rinfo->length < 2) { | |
677 | return -EINVAL; | |
678 | } | |
679 | } else if (rinfo->prefix_len > 0) { | |
680 | if (rinfo->length < 1) { | |
681 | return -EINVAL; | |
682 | } | |
683 | } | |
684 | ||
685 | pref = rinfo->route_pref; | |
686 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 687 | return -EINVAL; |
70ceb4f5 | 688 | |
4bed72e4 | 689 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
690 | |
691 | if (rinfo->length == 3) | |
692 | prefix = (struct in6_addr *)rinfo->prefix; | |
693 | else { | |
694 | /* this function is safe */ | |
695 | ipv6_addr_prefix(&prefix_buf, | |
696 | (struct in6_addr *)rinfo->prefix, | |
697 | rinfo->prefix_len); | |
698 | prefix = &prefix_buf; | |
699 | } | |
700 | ||
efa2cea0 DL |
701 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
702 | dev->ifindex); | |
70ceb4f5 YH |
703 | |
704 | if (rt && !lifetime) { | |
e0a1ad73 | 705 | ip6_del_rt(rt); |
70ceb4f5 YH |
706 | rt = NULL; |
707 | } | |
708 | ||
709 | if (!rt && lifetime) | |
efa2cea0 | 710 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
711 | pref); |
712 | else if (rt) | |
713 | rt->rt6i_flags = RTF_ROUTEINFO | | |
714 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
715 | ||
716 | if (rt) { | |
1716a961 G |
717 | if (!addrconf_finite_timeout(lifetime)) |
718 | rt6_clean_expires(rt); | |
719 | else | |
720 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
721 | ||
94e187c0 | 722 | ip6_rt_put(rt); |
70ceb4f5 YH |
723 | } |
724 | return 0; | |
725 | } | |
726 | #endif | |
727 | ||
8ed67789 | 728 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 729 | do { \ |
8ed67789 | 730 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 731 | struct fib6_node *pn; \ |
e0eda7bb | 732 | while (1) { \ |
982f56f3 YH |
733 | if (fn->fn_flags & RTN_TL_ROOT) \ |
734 | goto out; \ | |
735 | pn = fn->parent; \ | |
736 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 737 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
738 | else \ |
739 | fn = pn; \ | |
740 | if (fn->fn_flags & RTN_RTINFO) \ | |
741 | goto restart; \ | |
c71099ac | 742 | } \ |
c71099ac | 743 | } \ |
38308473 | 744 | } while (0) |
c71099ac | 745 | |
8ed67789 DL |
746 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
747 | struct fib6_table *table, | |
4c9483b2 | 748 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
749 | { |
750 | struct fib6_node *fn; | |
751 | struct rt6_info *rt; | |
752 | ||
c71099ac | 753 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 754 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
755 | restart: |
756 | rt = fn->leaf; | |
4c9483b2 | 757 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 ND |
758 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
759 | rt = rt6_multipath_select(rt, fl6); | |
4c9483b2 | 760 | BACKTRACK(net, &fl6->saddr); |
c71099ac | 761 | out: |
d8d1f30b | 762 | dst_use(&rt->dst, jiffies); |
c71099ac | 763 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
764 | return rt; |
765 | ||
766 | } | |
767 | ||
ea6e574e FW |
768 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
769 | int flags) | |
770 | { | |
771 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
772 | } | |
773 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
774 | ||
9acd9f3a YH |
775 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
776 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 777 | { |
4c9483b2 DM |
778 | struct flowi6 fl6 = { |
779 | .flowi6_oif = oif, | |
780 | .daddr = *daddr, | |
c71099ac TG |
781 | }; |
782 | struct dst_entry *dst; | |
77d16f45 | 783 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 784 | |
adaa70bb | 785 | if (saddr) { |
4c9483b2 | 786 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
787 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
788 | } | |
789 | ||
4c9483b2 | 790 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
791 | if (dst->error == 0) |
792 | return (struct rt6_info *) dst; | |
793 | ||
794 | dst_release(dst); | |
795 | ||
1da177e4 LT |
796 | return NULL; |
797 | } | |
798 | ||
7159039a YH |
799 | EXPORT_SYMBOL(rt6_lookup); |
800 | ||
c71099ac | 801 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
802 | It takes new route entry, the addition fails by any reason the |
803 | route is freed. In any case, if caller does not hold it, it may | |
804 | be destroyed. | |
805 | */ | |
806 | ||
86872cb5 | 807 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
808 | { |
809 | int err; | |
c71099ac | 810 | struct fib6_table *table; |
1da177e4 | 811 | |
c71099ac TG |
812 | table = rt->rt6i_table; |
813 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 814 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 815 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
816 | |
817 | return err; | |
818 | } | |
819 | ||
40e22e8f TG |
820 | int ip6_ins_rt(struct rt6_info *rt) |
821 | { | |
4d1169c1 | 822 | struct nl_info info = { |
d1918542 | 823 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 824 | }; |
528c4ceb | 825 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
826 | } |
827 | ||
1716a961 | 828 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 829 | const struct in6_addr *daddr, |
b71d1d42 | 830 | const struct in6_addr *saddr) |
1da177e4 | 831 | { |
1da177e4 LT |
832 | struct rt6_info *rt; |
833 | ||
834 | /* | |
835 | * Clone the route. | |
836 | */ | |
837 | ||
21efcfa0 | 838 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
839 | |
840 | if (rt) { | |
14deae41 DM |
841 | int attempts = !in_softirq(); |
842 | ||
38308473 | 843 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 844 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 845 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 846 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 847 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 848 | } |
1da177e4 | 849 | |
1da177e4 | 850 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
851 | |
852 | #ifdef CONFIG_IPV6_SUBTREES | |
853 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 854 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
855 | rt->rt6i_src.plen = 128; |
856 | } | |
857 | #endif | |
858 | ||
14deae41 | 859 | retry: |
8ade06c6 | 860 | if (rt6_bind_neighbour(rt, rt->dst.dev)) { |
d1918542 | 861 | struct net *net = dev_net(rt->dst.dev); |
14deae41 DM |
862 | int saved_rt_min_interval = |
863 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
864 | int saved_rt_elasticity = | |
865 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
866 | ||
867 | if (attempts-- > 0) { | |
868 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
869 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
870 | ||
86393e52 | 871 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
872 | |
873 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
874 | saved_rt_elasticity; | |
875 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
876 | saved_rt_min_interval; | |
877 | goto retry; | |
878 | } | |
879 | ||
f3213831 | 880 | net_warn_ratelimited("Neighbour table overflow\n"); |
d8d1f30b | 881 | dst_free(&rt->dst); |
14deae41 DM |
882 | return NULL; |
883 | } | |
95a9a5ba | 884 | } |
1da177e4 | 885 | |
95a9a5ba YH |
886 | return rt; |
887 | } | |
1da177e4 | 888 | |
21efcfa0 ED |
889 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
890 | const struct in6_addr *daddr) | |
299d9939 | 891 | { |
21efcfa0 ED |
892 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
893 | ||
299d9939 | 894 | if (rt) { |
299d9939 | 895 | rt->rt6i_flags |= RTF_CACHE; |
97cac082 | 896 | rt->n = neigh_clone(ort->n); |
299d9939 YH |
897 | } |
898 | return rt; | |
899 | } | |
900 | ||
8ed67789 | 901 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 902 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
903 | { |
904 | struct fib6_node *fn; | |
519fbd87 | 905 | struct rt6_info *rt, *nrt; |
c71099ac | 906 | int strict = 0; |
1da177e4 | 907 | int attempts = 3; |
519fbd87 | 908 | int err; |
53b7997f | 909 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 910 | |
77d16f45 | 911 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
912 | |
913 | relookup: | |
c71099ac | 914 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 915 | |
8238dd06 | 916 | restart_2: |
4c9483b2 | 917 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
918 | |
919 | restart: | |
4acad72d | 920 | rt = rt6_select(fn, oif, strict | reachable); |
51ebd318 ND |
921 | if (rt->rt6i_nsiblings && oif == 0) |
922 | rt = rt6_multipath_select(rt, fl6); | |
4c9483b2 | 923 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 924 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 925 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 926 | goto out; |
1da177e4 | 927 | |
d8d1f30b | 928 | dst_hold(&rt->dst); |
c71099ac | 929 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 930 | |
97cac082 | 931 | if (!rt->n && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 932 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 933 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 934 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
935 | else |
936 | goto out2; | |
e40cf353 | 937 | |
94e187c0 | 938 | ip6_rt_put(rt); |
8ed67789 | 939 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 940 | |
d8d1f30b | 941 | dst_hold(&rt->dst); |
519fbd87 | 942 | if (nrt) { |
40e22e8f | 943 | err = ip6_ins_rt(nrt); |
519fbd87 | 944 | if (!err) |
1da177e4 | 945 | goto out2; |
1da177e4 | 946 | } |
1da177e4 | 947 | |
519fbd87 YH |
948 | if (--attempts <= 0) |
949 | goto out2; | |
950 | ||
951 | /* | |
c71099ac | 952 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
953 | * released someone could insert this route. Relookup. |
954 | */ | |
94e187c0 | 955 | ip6_rt_put(rt); |
519fbd87 YH |
956 | goto relookup; |
957 | ||
958 | out: | |
8238dd06 YH |
959 | if (reachable) { |
960 | reachable = 0; | |
961 | goto restart_2; | |
962 | } | |
d8d1f30b | 963 | dst_hold(&rt->dst); |
c71099ac | 964 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 965 | out2: |
d8d1f30b CG |
966 | rt->dst.lastuse = jiffies; |
967 | rt->dst.__use++; | |
c71099ac TG |
968 | |
969 | return rt; | |
1da177e4 LT |
970 | } |
971 | ||
8ed67789 | 972 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 973 | struct flowi6 *fl6, int flags) |
4acad72d | 974 | { |
4c9483b2 | 975 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
976 | } |
977 | ||
72331bc0 SL |
978 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
979 | struct net_device *dev, | |
980 | struct flowi6 *fl6, int flags) | |
981 | { | |
982 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
983 | flags |= RT6_LOOKUP_F_IFACE; | |
984 | ||
985 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
986 | } | |
987 | ||
c71099ac TG |
988 | void ip6_route_input(struct sk_buff *skb) |
989 | { | |
b71d1d42 | 990 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 991 | struct net *net = dev_net(skb->dev); |
adaa70bb | 992 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
993 | struct flowi6 fl6 = { |
994 | .flowi6_iif = skb->dev->ifindex, | |
995 | .daddr = iph->daddr, | |
996 | .saddr = iph->saddr, | |
38308473 | 997 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
998 | .flowi6_mark = skb->mark, |
999 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1000 | }; |
adaa70bb | 1001 | |
72331bc0 | 1002 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1003 | } |
1004 | ||
8ed67789 | 1005 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1006 | struct flowi6 *fl6, int flags) |
1da177e4 | 1007 | { |
4c9483b2 | 1008 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1009 | } |
1010 | ||
9c7a4f9c | 1011 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1012 | struct flowi6 *fl6) |
c71099ac TG |
1013 | { |
1014 | int flags = 0; | |
1015 | ||
1fb9489b | 1016 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1017 | |
4c9483b2 | 1018 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 1019 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1020 | |
4c9483b2 | 1021 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 1022 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1023 | else if (sk) |
1024 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1025 | |
4c9483b2 | 1026 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
1027 | } |
1028 | ||
7159039a | 1029 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1030 | |
2774c131 | 1031 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1032 | { |
5c1e6aa3 | 1033 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1034 | struct dst_entry *new = NULL; |
1035 | ||
f5b0a874 | 1036 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1037 | if (rt) { |
d8d1f30b | 1038 | new = &rt->dst; |
14e50e57 | 1039 | |
8104891b SK |
1040 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
1041 | rt6_init_peer(rt, net->ipv6.peers); | |
1042 | ||
14e50e57 | 1043 | new->__use = 1; |
352e512c HX |
1044 | new->input = dst_discard; |
1045 | new->output = dst_discard; | |
14e50e57 | 1046 | |
21efcfa0 ED |
1047 | if (dst_metrics_read_only(&ort->dst)) |
1048 | new->_metrics = ort->dst._metrics; | |
1049 | else | |
1050 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1051 | rt->rt6i_idev = ort->rt6i_idev; |
1052 | if (rt->rt6i_idev) | |
1053 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1054 | |
4e3fd7a0 | 1055 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1056 | rt->rt6i_flags = ort->rt6i_flags; |
1057 | rt6_clean_expires(rt); | |
14e50e57 DM |
1058 | rt->rt6i_metric = 0; |
1059 | ||
1060 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1061 | #ifdef CONFIG_IPV6_SUBTREES | |
1062 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1063 | #endif | |
1064 | ||
1065 | dst_free(new); | |
1066 | } | |
1067 | ||
69ead7af DM |
1068 | dst_release(dst_orig); |
1069 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1070 | } |
14e50e57 | 1071 | |
1da177e4 LT |
1072 | /* |
1073 | * Destination cache support functions | |
1074 | */ | |
1075 | ||
1076 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
1077 | { | |
1078 | struct rt6_info *rt; | |
1079 | ||
1080 | rt = (struct rt6_info *) dst; | |
1081 | ||
6f3118b5 ND |
1082 | /* All IPV6 dsts are created with ->obsolete set to the value |
1083 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1084 | * into this function always. | |
1085 | */ | |
1086 | if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev))) | |
1087 | return NULL; | |
1088 | ||
a4477c4d | 1089 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
1da177e4 | 1090 | return dst; |
a4477c4d | 1091 | |
1da177e4 LT |
1092 | return NULL; |
1093 | } | |
1094 | ||
1095 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1096 | { | |
1097 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1098 | ||
1099 | if (rt) { | |
54c1a859 YH |
1100 | if (rt->rt6i_flags & RTF_CACHE) { |
1101 | if (rt6_check_expired(rt)) { | |
1102 | ip6_del_rt(rt); | |
1103 | dst = NULL; | |
1104 | } | |
1105 | } else { | |
1da177e4 | 1106 | dst_release(dst); |
54c1a859 YH |
1107 | dst = NULL; |
1108 | } | |
1da177e4 | 1109 | } |
54c1a859 | 1110 | return dst; |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | static void ip6_link_failure(struct sk_buff *skb) | |
1114 | { | |
1115 | struct rt6_info *rt; | |
1116 | ||
3ffe533c | 1117 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1118 | |
adf30907 | 1119 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1120 | if (rt) { |
1716a961 G |
1121 | if (rt->rt6i_flags & RTF_CACHE) |
1122 | rt6_update_expires(rt, 0); | |
1123 | else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1da177e4 LT |
1124 | rt->rt6i_node->fn_sernum = -1; |
1125 | } | |
1126 | } | |
1127 | ||
6700c270 DM |
1128 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1129 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
1130 | { |
1131 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1132 | ||
81aded24 | 1133 | dst_confirm(dst); |
1da177e4 | 1134 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1135 | struct net *net = dev_net(dst->dev); |
1136 | ||
1da177e4 LT |
1137 | rt6->rt6i_flags |= RTF_MODIFIED; |
1138 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1139 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1140 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1141 | features |= RTAX_FEATURE_ALLFRAG; |
1142 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1143 | } |
defb3519 | 1144 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1145 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1146 | } |
1147 | } | |
1148 | ||
42ae66c8 DM |
1149 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1150 | int oif, u32 mark) | |
81aded24 DM |
1151 | { |
1152 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1153 | struct dst_entry *dst; | |
1154 | struct flowi6 fl6; | |
1155 | ||
1156 | memset(&fl6, 0, sizeof(fl6)); | |
1157 | fl6.flowi6_oif = oif; | |
1158 | fl6.flowi6_mark = mark; | |
3e12939a | 1159 | fl6.flowi6_flags = 0; |
81aded24 DM |
1160 | fl6.daddr = iph->daddr; |
1161 | fl6.saddr = iph->saddr; | |
1162 | fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK; | |
1163 | ||
1164 | dst = ip6_route_output(net, NULL, &fl6); | |
1165 | if (!dst->error) | |
6700c270 | 1166 | ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); |
81aded24 DM |
1167 | dst_release(dst); |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1170 | ||
1171 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1172 | { | |
1173 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1174 | sk->sk_bound_dev_if, sk->sk_mark); | |
1175 | } | |
1176 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1177 | ||
3a5ad2ee DM |
1178 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1179 | { | |
1180 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1181 | struct dst_entry *dst; | |
1182 | struct flowi6 fl6; | |
1183 | ||
1184 | memset(&fl6, 0, sizeof(fl6)); | |
1185 | fl6.flowi6_oif = oif; | |
1186 | fl6.flowi6_mark = mark; | |
1187 | fl6.flowi6_flags = 0; | |
1188 | fl6.daddr = iph->daddr; | |
1189 | fl6.saddr = iph->saddr; | |
1190 | fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK; | |
1191 | ||
1192 | dst = ip6_route_output(net, NULL, &fl6); | |
1193 | if (!dst->error) | |
6700c270 | 1194 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
1195 | dst_release(dst); |
1196 | } | |
1197 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1198 | ||
1199 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1200 | { | |
1201 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1202 | } | |
1203 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1204 | ||
0dbaee3b | 1205 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1206 | { |
0dbaee3b DM |
1207 | struct net_device *dev = dst->dev; |
1208 | unsigned int mtu = dst_mtu(dst); | |
1209 | struct net *net = dev_net(dev); | |
1210 | ||
1da177e4 LT |
1211 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1212 | ||
5578689a DL |
1213 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1214 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1215 | |
1216 | /* | |
1ab1457c YH |
1217 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1218 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1219 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1220 | * rely only on pmtu discovery" |
1221 | */ | |
1222 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1223 | mtu = IPV6_MAXPLEN; | |
1224 | return mtu; | |
1225 | } | |
1226 | ||
ebb762f2 | 1227 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1228 | { |
d33e4553 | 1229 | struct inet6_dev *idev; |
618f9bc7 SK |
1230 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1231 | ||
1232 | if (mtu) | |
1233 | return mtu; | |
1234 | ||
1235 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1236 | |
1237 | rcu_read_lock(); | |
1238 | idev = __in6_dev_get(dst->dev); | |
1239 | if (idev) | |
1240 | mtu = idev->cnf.mtu6; | |
1241 | rcu_read_unlock(); | |
1242 | ||
1243 | return mtu; | |
1244 | } | |
1245 | ||
3b00944c YH |
1246 | static struct dst_entry *icmp6_dst_gc_list; |
1247 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1248 | |
3b00944c | 1249 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1250 | struct neighbour *neigh, |
87a11578 | 1251 | struct flowi6 *fl6) |
1da177e4 | 1252 | { |
87a11578 | 1253 | struct dst_entry *dst; |
1da177e4 LT |
1254 | struct rt6_info *rt; |
1255 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1256 | struct net *net = dev_net(dev); |
1da177e4 | 1257 | |
38308473 | 1258 | if (unlikely(!idev)) |
122bdf67 | 1259 | return ERR_PTR(-ENODEV); |
1da177e4 | 1260 | |
8b96d22d | 1261 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1262 | if (unlikely(!rt)) { |
1da177e4 | 1263 | in6_dev_put(idev); |
87a11578 | 1264 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1265 | goto out; |
1266 | } | |
1267 | ||
1da177e4 LT |
1268 | if (neigh) |
1269 | neigh_hold(neigh); | |
14deae41 | 1270 | else { |
f894cbf8 | 1271 | neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr); |
b43faac6 | 1272 | if (IS_ERR(neigh)) { |
252c3d84 | 1273 | in6_dev_put(idev); |
b43faac6 DM |
1274 | dst_free(&rt->dst); |
1275 | return ERR_CAST(neigh); | |
1276 | } | |
14deae41 | 1277 | } |
1da177e4 | 1278 | |
8e2ec639 YZ |
1279 | rt->dst.flags |= DST_HOST; |
1280 | rt->dst.output = ip6_output; | |
97cac082 | 1281 | rt->n = neigh; |
d8d1f30b | 1282 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1283 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1284 | rt->rt6i_dst.plen = 128; |
1285 | rt->rt6i_idev = idev; | |
14edd87d | 1286 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1287 | |
3b00944c | 1288 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1289 | rt->dst.next = icmp6_dst_gc_list; |
1290 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1291 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1292 | |
5578689a | 1293 | fib6_force_start_gc(net); |
1da177e4 | 1294 | |
87a11578 DM |
1295 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1296 | ||
1da177e4 | 1297 | out: |
87a11578 | 1298 | return dst; |
1da177e4 LT |
1299 | } |
1300 | ||
3d0f24a7 | 1301 | int icmp6_dst_gc(void) |
1da177e4 | 1302 | { |
e9476e95 | 1303 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1304 | int more = 0; |
1da177e4 | 1305 | |
3b00944c YH |
1306 | spin_lock_bh(&icmp6_dst_lock); |
1307 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1308 | |
1da177e4 LT |
1309 | while ((dst = *pprev) != NULL) { |
1310 | if (!atomic_read(&dst->__refcnt)) { | |
1311 | *pprev = dst->next; | |
1312 | dst_free(dst); | |
1da177e4 LT |
1313 | } else { |
1314 | pprev = &dst->next; | |
3d0f24a7 | 1315 | ++more; |
1da177e4 LT |
1316 | } |
1317 | } | |
1318 | ||
3b00944c | 1319 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1320 | |
3d0f24a7 | 1321 | return more; |
1da177e4 LT |
1322 | } |
1323 | ||
1e493d19 DM |
1324 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1325 | void *arg) | |
1326 | { | |
1327 | struct dst_entry *dst, **pprev; | |
1328 | ||
1329 | spin_lock_bh(&icmp6_dst_lock); | |
1330 | pprev = &icmp6_dst_gc_list; | |
1331 | while ((dst = *pprev) != NULL) { | |
1332 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1333 | if (func(rt, arg)) { | |
1334 | *pprev = dst->next; | |
1335 | dst_free(dst); | |
1336 | } else { | |
1337 | pprev = &dst->next; | |
1338 | } | |
1339 | } | |
1340 | spin_unlock_bh(&icmp6_dst_lock); | |
1341 | } | |
1342 | ||
569d3645 | 1343 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1344 | { |
1da177e4 | 1345 | unsigned long now = jiffies; |
86393e52 | 1346 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1347 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1348 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1349 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1350 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1351 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1352 | int entries; |
7019b78e | 1353 | |
fc66f95c | 1354 | entries = dst_entries_get_fast(ops); |
7019b78e | 1355 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1356 | entries <= rt_max_size) |
1da177e4 LT |
1357 | goto out; |
1358 | ||
6891a346 BT |
1359 | net->ipv6.ip6_rt_gc_expire++; |
1360 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1361 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1362 | entries = dst_entries_get_slow(ops); |
1363 | if (entries < ops->gc_thresh) | |
7019b78e | 1364 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1365 | out: |
7019b78e | 1366 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1367 | return entries > rt_max_size; |
1da177e4 LT |
1368 | } |
1369 | ||
6b75d090 | 1370 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1371 | { |
5170ae82 | 1372 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1373 | if (hoplimit == 0) { |
6b75d090 | 1374 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1375 | struct inet6_dev *idev; |
1376 | ||
1377 | rcu_read_lock(); | |
1378 | idev = __in6_dev_get(dev); | |
1379 | if (idev) | |
6b75d090 | 1380 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1381 | else |
53b7997f | 1382 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1383 | rcu_read_unlock(); |
1da177e4 LT |
1384 | } |
1385 | return hoplimit; | |
1386 | } | |
abbf46ae | 1387 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1388 | |
1389 | /* | |
1390 | * | |
1391 | */ | |
1392 | ||
86872cb5 | 1393 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1394 | { |
1395 | int err; | |
5578689a | 1396 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1397 | struct rt6_info *rt = NULL; |
1398 | struct net_device *dev = NULL; | |
1399 | struct inet6_dev *idev = NULL; | |
c71099ac | 1400 | struct fib6_table *table; |
1da177e4 LT |
1401 | int addr_type; |
1402 | ||
86872cb5 | 1403 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1404 | return -EINVAL; |
1405 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1406 | if (cfg->fc_src_len) |
1da177e4 LT |
1407 | return -EINVAL; |
1408 | #endif | |
86872cb5 | 1409 | if (cfg->fc_ifindex) { |
1da177e4 | 1410 | err = -ENODEV; |
5578689a | 1411 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1412 | if (!dev) |
1413 | goto out; | |
1414 | idev = in6_dev_get(dev); | |
1415 | if (!idev) | |
1416 | goto out; | |
1417 | } | |
1418 | ||
86872cb5 TG |
1419 | if (cfg->fc_metric == 0) |
1420 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1421 | |
d71314b4 | 1422 | err = -ENOBUFS; |
38308473 DM |
1423 | if (cfg->fc_nlinfo.nlh && |
1424 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1425 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1426 | if (!table) { |
f3213831 | 1427 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1428 | table = fib6_new_table(net, cfg->fc_table); |
1429 | } | |
1430 | } else { | |
1431 | table = fib6_new_table(net, cfg->fc_table); | |
1432 | } | |
38308473 DM |
1433 | |
1434 | if (!table) | |
c71099ac | 1435 | goto out; |
c71099ac | 1436 | |
8b96d22d | 1437 | rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table); |
1da177e4 | 1438 | |
38308473 | 1439 | if (!rt) { |
1da177e4 LT |
1440 | err = -ENOMEM; |
1441 | goto out; | |
1442 | } | |
1443 | ||
1716a961 G |
1444 | if (cfg->fc_flags & RTF_EXPIRES) |
1445 | rt6_set_expires(rt, jiffies + | |
1446 | clock_t_to_jiffies(cfg->fc_expires)); | |
1447 | else | |
1448 | rt6_clean_expires(rt); | |
1da177e4 | 1449 | |
86872cb5 TG |
1450 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1451 | cfg->fc_protocol = RTPROT_BOOT; | |
1452 | rt->rt6i_protocol = cfg->fc_protocol; | |
1453 | ||
1454 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1455 | |
1456 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1457 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1458 | else if (cfg->fc_flags & RTF_LOCAL) |
1459 | rt->dst.input = ip6_input; | |
1da177e4 | 1460 | else |
d8d1f30b | 1461 | rt->dst.input = ip6_forward; |
1da177e4 | 1462 | |
d8d1f30b | 1463 | rt->dst.output = ip6_output; |
1da177e4 | 1464 | |
86872cb5 TG |
1465 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1466 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1467 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1468 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1469 | |
8e2ec639 YZ |
1470 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1471 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1472 | if (!metrics) { | |
1473 | err = -ENOMEM; | |
1474 | goto out; | |
1475 | } | |
1476 | dst_init_metrics(&rt->dst, metrics, 0); | |
1477 | } | |
1da177e4 | 1478 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1479 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1480 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1481 | #endif |
1482 | ||
86872cb5 | 1483 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1484 | |
1485 | /* We cannot add true routes via loopback here, | |
1486 | they would result in kernel looping; promote them to reject routes | |
1487 | */ | |
86872cb5 | 1488 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1489 | (dev && (dev->flags & IFF_LOOPBACK) && |
1490 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1491 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1492 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1493 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1494 | if (dev) { |
1495 | dev_put(dev); | |
1496 | in6_dev_put(idev); | |
1497 | } | |
5578689a | 1498 | dev = net->loopback_dev; |
1da177e4 LT |
1499 | dev_hold(dev); |
1500 | idev = in6_dev_get(dev); | |
1501 | if (!idev) { | |
1502 | err = -ENODEV; | |
1503 | goto out; | |
1504 | } | |
1505 | } | |
d8d1f30b CG |
1506 | rt->dst.output = ip6_pkt_discard_out; |
1507 | rt->dst.input = ip6_pkt_discard; | |
1da177e4 | 1508 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1509 | switch (cfg->fc_type) { |
1510 | case RTN_BLACKHOLE: | |
1511 | rt->dst.error = -EINVAL; | |
1512 | break; | |
1513 | case RTN_PROHIBIT: | |
1514 | rt->dst.error = -EACCES; | |
1515 | break; | |
b4949ab2 ND |
1516 | case RTN_THROW: |
1517 | rt->dst.error = -EAGAIN; | |
1518 | break; | |
ef2c7d7b ND |
1519 | default: |
1520 | rt->dst.error = -ENETUNREACH; | |
1521 | break; | |
1522 | } | |
1da177e4 LT |
1523 | goto install_route; |
1524 | } | |
1525 | ||
86872cb5 | 1526 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1527 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1528 | int gwa_type; |
1529 | ||
86872cb5 | 1530 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1531 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1532 | gwa_type = ipv6_addr_type(gw_addr); |
1533 | ||
1534 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1535 | struct rt6_info *grt; | |
1536 | ||
1537 | /* IPv6 strictly inhibits using not link-local | |
1538 | addresses as nexthop address. | |
1539 | Otherwise, router will not able to send redirects. | |
1540 | It is very good, but in some (rare!) circumstances | |
1541 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1542 | some exceptions. --ANK | |
1543 | */ | |
1544 | err = -EINVAL; | |
38308473 | 1545 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1546 | goto out; |
1547 | ||
5578689a | 1548 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1549 | |
1550 | err = -EHOSTUNREACH; | |
38308473 | 1551 | if (!grt) |
1da177e4 LT |
1552 | goto out; |
1553 | if (dev) { | |
d1918542 | 1554 | if (dev != grt->dst.dev) { |
94e187c0 | 1555 | ip6_rt_put(grt); |
1da177e4 LT |
1556 | goto out; |
1557 | } | |
1558 | } else { | |
d1918542 | 1559 | dev = grt->dst.dev; |
1da177e4 LT |
1560 | idev = grt->rt6i_idev; |
1561 | dev_hold(dev); | |
1562 | in6_dev_hold(grt->rt6i_idev); | |
1563 | } | |
38308473 | 1564 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1565 | err = 0; |
94e187c0 | 1566 | ip6_rt_put(grt); |
1da177e4 LT |
1567 | |
1568 | if (err) | |
1569 | goto out; | |
1570 | } | |
1571 | err = -EINVAL; | |
38308473 | 1572 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1573 | goto out; |
1574 | } | |
1575 | ||
1576 | err = -ENODEV; | |
38308473 | 1577 | if (!dev) |
1da177e4 LT |
1578 | goto out; |
1579 | ||
c3968a85 DW |
1580 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1581 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1582 | err = -EINVAL; | |
1583 | goto out; | |
1584 | } | |
4e3fd7a0 | 1585 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1586 | rt->rt6i_prefsrc.plen = 128; |
1587 | } else | |
1588 | rt->rt6i_prefsrc.plen = 0; | |
1589 | ||
86872cb5 | 1590 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
8ade06c6 | 1591 | err = rt6_bind_neighbour(rt, dev); |
f83c7790 | 1592 | if (err) |
1da177e4 | 1593 | goto out; |
1da177e4 LT |
1594 | } |
1595 | ||
86872cb5 | 1596 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1597 | |
1598 | install_route: | |
86872cb5 TG |
1599 | if (cfg->fc_mx) { |
1600 | struct nlattr *nla; | |
1601 | int remaining; | |
1602 | ||
1603 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1604 | int type = nla_type(nla); |
86872cb5 TG |
1605 | |
1606 | if (type) { | |
1607 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1608 | err = -EINVAL; |
1609 | goto out; | |
1610 | } | |
86872cb5 | 1611 | |
defb3519 | 1612 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1613 | } |
1da177e4 LT |
1614 | } |
1615 | } | |
1616 | ||
d8d1f30b | 1617 | rt->dst.dev = dev; |
1da177e4 | 1618 | rt->rt6i_idev = idev; |
c71099ac | 1619 | rt->rt6i_table = table; |
63152fc0 | 1620 | |
c346dca1 | 1621 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1622 | |
86872cb5 | 1623 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1624 | |
1625 | out: | |
1626 | if (dev) | |
1627 | dev_put(dev); | |
1628 | if (idev) | |
1629 | in6_dev_put(idev); | |
1630 | if (rt) | |
d8d1f30b | 1631 | dst_free(&rt->dst); |
1da177e4 LT |
1632 | return err; |
1633 | } | |
1634 | ||
86872cb5 | 1635 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1636 | { |
1637 | int err; | |
c71099ac | 1638 | struct fib6_table *table; |
d1918542 | 1639 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1640 | |
6825a26c G |
1641 | if (rt == net->ipv6.ip6_null_entry) { |
1642 | err = -ENOENT; | |
1643 | goto out; | |
1644 | } | |
6c813a72 | 1645 | |
c71099ac TG |
1646 | table = rt->rt6i_table; |
1647 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 1648 | err = fib6_del(rt, info); |
c71099ac | 1649 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 1650 | |
6825a26c | 1651 | out: |
94e187c0 | 1652 | ip6_rt_put(rt); |
1da177e4 LT |
1653 | return err; |
1654 | } | |
1655 | ||
e0a1ad73 TG |
1656 | int ip6_del_rt(struct rt6_info *rt) |
1657 | { | |
4d1169c1 | 1658 | struct nl_info info = { |
d1918542 | 1659 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1660 | }; |
528c4ceb | 1661 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1662 | } |
1663 | ||
86872cb5 | 1664 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1665 | { |
c71099ac | 1666 | struct fib6_table *table; |
1da177e4 LT |
1667 | struct fib6_node *fn; |
1668 | struct rt6_info *rt; | |
1669 | int err = -ESRCH; | |
1670 | ||
5578689a | 1671 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1672 | if (!table) |
c71099ac TG |
1673 | return err; |
1674 | ||
1675 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1676 | |
c71099ac | 1677 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1678 | &cfg->fc_dst, cfg->fc_dst_len, |
1679 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1680 | |
1da177e4 | 1681 | if (fn) { |
d8d1f30b | 1682 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1683 | if (cfg->fc_ifindex && |
d1918542 DM |
1684 | (!rt->dst.dev || |
1685 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1686 | continue; |
86872cb5 TG |
1687 | if (cfg->fc_flags & RTF_GATEWAY && |
1688 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1689 | continue; |
86872cb5 | 1690 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1691 | continue; |
d8d1f30b | 1692 | dst_hold(&rt->dst); |
c71099ac | 1693 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1694 | |
86872cb5 | 1695 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1696 | } |
1697 | } | |
c71099ac | 1698 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1699 | |
1700 | return err; | |
1701 | } | |
1702 | ||
6700c270 | 1703 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 1704 | { |
e8599ff4 | 1705 | struct net *net = dev_net(skb->dev); |
a6279458 | 1706 | struct netevent_redirect netevent; |
e8599ff4 DM |
1707 | struct rt6_info *rt, *nrt = NULL; |
1708 | const struct in6_addr *target; | |
e8599ff4 | 1709 | struct ndisc_options ndopts; |
6e157b6a DM |
1710 | const struct in6_addr *dest; |
1711 | struct neighbour *old_neigh; | |
e8599ff4 DM |
1712 | struct inet6_dev *in6_dev; |
1713 | struct neighbour *neigh; | |
1714 | struct icmp6hdr *icmph; | |
6e157b6a DM |
1715 | int optlen, on_link; |
1716 | u8 *lladdr; | |
e8599ff4 DM |
1717 | |
1718 | optlen = skb->tail - skb->transport_header; | |
1719 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1720 | ||
1721 | if (optlen < 0) { | |
6e157b6a | 1722 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
1723 | return; |
1724 | } | |
1725 | ||
1726 | icmph = icmp6_hdr(skb); | |
1727 | target = (const struct in6_addr *) (icmph + 1); | |
1728 | dest = target + 1; | |
1729 | ||
1730 | if (ipv6_addr_is_multicast(dest)) { | |
6e157b6a | 1731 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
1732 | return; |
1733 | } | |
1734 | ||
6e157b6a | 1735 | on_link = 0; |
e8599ff4 DM |
1736 | if (ipv6_addr_equal(dest, target)) { |
1737 | on_link = 1; | |
1738 | } else if (ipv6_addr_type(target) != | |
1739 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
6e157b6a | 1740 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
1741 | return; |
1742 | } | |
1743 | ||
1744 | in6_dev = __in6_dev_get(skb->dev); | |
1745 | if (!in6_dev) | |
1746 | return; | |
1747 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
1748 | return; | |
1749 | ||
1750 | /* RFC2461 8.1: | |
1751 | * The IP source address of the Redirect MUST be the same as the current | |
1752 | * first-hop router for the specified ICMP Destination Address. | |
1753 | */ | |
1754 | ||
1755 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { | |
1756 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); | |
1757 | return; | |
1758 | } | |
6e157b6a DM |
1759 | |
1760 | lladdr = NULL; | |
e8599ff4 DM |
1761 | if (ndopts.nd_opts_tgt_lladdr) { |
1762 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1763 | skb->dev); | |
1764 | if (!lladdr) { | |
1765 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
1766 | return; | |
1767 | } | |
1768 | } | |
1769 | ||
6e157b6a DM |
1770 | rt = (struct rt6_info *) dst; |
1771 | if (rt == net->ipv6.ip6_null_entry) { | |
1772 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 1773 | return; |
6e157b6a | 1774 | } |
e8599ff4 | 1775 | |
6e157b6a DM |
1776 | /* Redirect received -> path was valid. |
1777 | * Look, redirects are sent only in response to data packets, | |
1778 | * so that this nexthop apparently is reachable. --ANK | |
1779 | */ | |
1780 | dst_confirm(&rt->dst); | |
a6279458 | 1781 | |
6e157b6a DM |
1782 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); |
1783 | if (!neigh) | |
1784 | return; | |
a6279458 | 1785 | |
6e157b6a DM |
1786 | /* Duplicate redirect: silently ignore. */ |
1787 | old_neigh = rt->n; | |
1788 | if (neigh == old_neigh) | |
a6279458 | 1789 | goto out; |
1da177e4 | 1790 | |
1da177e4 LT |
1791 | /* |
1792 | * We have finally decided to accept it. | |
1793 | */ | |
1794 | ||
1ab1457c | 1795 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1796 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1797 | NEIGH_UPDATE_F_OVERRIDE| | |
1798 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1799 | NEIGH_UPDATE_F_ISROUTER)) | |
1800 | ); | |
1801 | ||
21efcfa0 | 1802 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1803 | if (!nrt) |
1da177e4 LT |
1804 | goto out; |
1805 | ||
1806 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1807 | if (on_link) | |
1808 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1809 | ||
4e3fd7a0 | 1810 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
97cac082 | 1811 | nrt->n = neigh_clone(neigh); |
1da177e4 | 1812 | |
40e22e8f | 1813 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1814 | goto out; |
1815 | ||
d8d1f30b | 1816 | netevent.old = &rt->dst; |
1d248b1c | 1817 | netevent.old_neigh = old_neigh; |
d8d1f30b | 1818 | netevent.new = &nrt->dst; |
1d248b1c DM |
1819 | netevent.new_neigh = neigh; |
1820 | netevent.daddr = dest; | |
8d71740c TT |
1821 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1822 | ||
38308473 | 1823 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 1824 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 1825 | ip6_del_rt(rt); |
1da177e4 LT |
1826 | } |
1827 | ||
1828 | out: | |
e8599ff4 | 1829 | neigh_release(neigh); |
6e157b6a DM |
1830 | } |
1831 | ||
1da177e4 LT |
1832 | /* |
1833 | * Misc support functions | |
1834 | */ | |
1835 | ||
1716a961 | 1836 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1837 | const struct in6_addr *dest) |
1da177e4 | 1838 | { |
d1918542 | 1839 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1840 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1841 | ort->rt6i_table); | |
1da177e4 LT |
1842 | |
1843 | if (rt) { | |
d8d1f30b CG |
1844 | rt->dst.input = ort->dst.input; |
1845 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1846 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1847 | |
4e3fd7a0 | 1848 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1849 | rt->rt6i_dst.plen = 128; |
defb3519 | 1850 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1851 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1852 | rt->rt6i_idev = ort->rt6i_idev; |
1853 | if (rt->rt6i_idev) | |
1854 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1855 | rt->dst.lastuse = jiffies; |
1da177e4 | 1856 | |
4e3fd7a0 | 1857 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1858 | rt->rt6i_flags = ort->rt6i_flags; |
1859 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == | |
1860 | (RTF_DEFAULT | RTF_ADDRCONF)) | |
1861 | rt6_set_from(rt, ort); | |
1862 | else | |
1863 | rt6_clean_expires(rt); | |
1da177e4 LT |
1864 | rt->rt6i_metric = 0; |
1865 | ||
1da177e4 LT |
1866 | #ifdef CONFIG_IPV6_SUBTREES |
1867 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1868 | #endif | |
0f6c6392 | 1869 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1870 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1871 | } |
1872 | return rt; | |
1873 | } | |
1874 | ||
70ceb4f5 | 1875 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1876 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1877 | const struct in6_addr *prefix, int prefixlen, |
1878 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1879 | { |
1880 | struct fib6_node *fn; | |
1881 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1882 | struct fib6_table *table; |
1883 | ||
efa2cea0 | 1884 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1885 | if (!table) |
c71099ac | 1886 | return NULL; |
70ceb4f5 | 1887 | |
5744dd9b | 1888 | read_lock_bh(&table->tb6_lock); |
c71099ac | 1889 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); |
70ceb4f5 YH |
1890 | if (!fn) |
1891 | goto out; | |
1892 | ||
d8d1f30b | 1893 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1894 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1895 | continue; |
1896 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1897 | continue; | |
1898 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1899 | continue; | |
d8d1f30b | 1900 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1901 | break; |
1902 | } | |
1903 | out: | |
5744dd9b | 1904 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1905 | return rt; |
1906 | } | |
1907 | ||
efa2cea0 | 1908 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1909 | const struct in6_addr *prefix, int prefixlen, |
1910 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1911 | unsigned int pref) |
70ceb4f5 | 1912 | { |
86872cb5 TG |
1913 | struct fib6_config cfg = { |
1914 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1915 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1916 | .fc_ifindex = ifindex, |
1917 | .fc_dst_len = prefixlen, | |
1918 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1919 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 1920 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
1921 | .fc_nlinfo.nlh = NULL, |
1922 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1923 | }; |
1924 | ||
4e3fd7a0 AD |
1925 | cfg.fc_dst = *prefix; |
1926 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1927 | |
e317da96 YH |
1928 | /* We should treat it as a default route if prefix length is 0. */ |
1929 | if (!prefixlen) | |
86872cb5 | 1930 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1931 | |
86872cb5 | 1932 | ip6_route_add(&cfg); |
70ceb4f5 | 1933 | |
efa2cea0 | 1934 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1935 | } |
1936 | #endif | |
1937 | ||
b71d1d42 | 1938 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1939 | { |
1da177e4 | 1940 | struct rt6_info *rt; |
c71099ac | 1941 | struct fib6_table *table; |
1da177e4 | 1942 | |
c346dca1 | 1943 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1944 | if (!table) |
c71099ac | 1945 | return NULL; |
1da177e4 | 1946 | |
5744dd9b | 1947 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1948 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1949 | if (dev == rt->dst.dev && |
045927ff | 1950 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1951 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1952 | break; | |
1953 | } | |
1954 | if (rt) | |
d8d1f30b | 1955 | dst_hold(&rt->dst); |
5744dd9b | 1956 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1957 | return rt; |
1958 | } | |
1959 | ||
b71d1d42 | 1960 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1961 | struct net_device *dev, |
1962 | unsigned int pref) | |
1da177e4 | 1963 | { |
86872cb5 TG |
1964 | struct fib6_config cfg = { |
1965 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1966 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1967 | .fc_ifindex = dev->ifindex, |
1968 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1969 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 1970 | .fc_nlinfo.portid = 0, |
5578689a | 1971 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 1972 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1973 | }; |
1da177e4 | 1974 | |
4e3fd7a0 | 1975 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1976 | |
86872cb5 | 1977 | ip6_route_add(&cfg); |
1da177e4 | 1978 | |
1da177e4 LT |
1979 | return rt6_get_dflt_router(gwaddr, dev); |
1980 | } | |
1981 | ||
7b4da532 | 1982 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1983 | { |
1984 | struct rt6_info *rt; | |
c71099ac TG |
1985 | struct fib6_table *table; |
1986 | ||
1987 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1988 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1989 | if (!table) |
c71099ac | 1990 | return; |
1da177e4 LT |
1991 | |
1992 | restart: | |
c71099ac | 1993 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1994 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1995 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1996 | dst_hold(&rt->dst); |
c71099ac | 1997 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1998 | ip6_del_rt(rt); |
1da177e4 LT |
1999 | goto restart; |
2000 | } | |
2001 | } | |
c71099ac | 2002 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2003 | } |
2004 | ||
5578689a DL |
2005 | static void rtmsg_to_fib6_config(struct net *net, |
2006 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2007 | struct fib6_config *cfg) |
2008 | { | |
2009 | memset(cfg, 0, sizeof(*cfg)); | |
2010 | ||
2011 | cfg->fc_table = RT6_TABLE_MAIN; | |
2012 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
2013 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2014 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2015 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2016 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2017 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2018 | ||
5578689a | 2019 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2020 | |
4e3fd7a0 AD |
2021 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2022 | cfg->fc_src = rtmsg->rtmsg_src; | |
2023 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2024 | } |
2025 | ||
5578689a | 2026 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2027 | { |
86872cb5 | 2028 | struct fib6_config cfg; |
1da177e4 LT |
2029 | struct in6_rtmsg rtmsg; |
2030 | int err; | |
2031 | ||
2032 | switch(cmd) { | |
2033 | case SIOCADDRT: /* Add a route */ | |
2034 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2035 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2036 | return -EPERM; |
2037 | err = copy_from_user(&rtmsg, arg, | |
2038 | sizeof(struct in6_rtmsg)); | |
2039 | if (err) | |
2040 | return -EFAULT; | |
86872cb5 | 2041 | |
5578689a | 2042 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2043 | |
1da177e4 LT |
2044 | rtnl_lock(); |
2045 | switch (cmd) { | |
2046 | case SIOCADDRT: | |
86872cb5 | 2047 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2048 | break; |
2049 | case SIOCDELRT: | |
86872cb5 | 2050 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2051 | break; |
2052 | default: | |
2053 | err = -EINVAL; | |
2054 | } | |
2055 | rtnl_unlock(); | |
2056 | ||
2057 | return err; | |
3ff50b79 | 2058 | } |
1da177e4 LT |
2059 | |
2060 | return -EINVAL; | |
2061 | } | |
2062 | ||
2063 | /* | |
2064 | * Drop the packet on the floor | |
2065 | */ | |
2066 | ||
d5fdd6ba | 2067 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2068 | { |
612f09e8 | 2069 | int type; |
adf30907 | 2070 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2071 | switch (ipstats_mib_noroutes) { |
2072 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2073 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2074 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2075 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2076 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2077 | break; |
2078 | } | |
2079 | /* FALLTHROUGH */ | |
2080 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2081 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2082 | ipstats_mib_noroutes); | |
612f09e8 YH |
2083 | break; |
2084 | } | |
3ffe533c | 2085 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2086 | kfree_skb(skb); |
2087 | return 0; | |
2088 | } | |
2089 | ||
9ce8ade0 TG |
2090 | static int ip6_pkt_discard(struct sk_buff *skb) |
2091 | { | |
612f09e8 | 2092 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2093 | } |
2094 | ||
20380731 | 2095 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2096 | { |
adf30907 | 2097 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2098 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2099 | } |
2100 | ||
6723ab54 DM |
2101 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2102 | ||
9ce8ade0 TG |
2103 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2104 | { | |
612f09e8 | 2105 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2106 | } |
2107 | ||
2108 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2109 | { | |
adf30907 | 2110 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2111 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2112 | } |
2113 | ||
6723ab54 DM |
2114 | #endif |
2115 | ||
1da177e4 LT |
2116 | /* |
2117 | * Allocate a dst for local (unicast / anycast) address. | |
2118 | */ | |
2119 | ||
2120 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2121 | const struct in6_addr *addr, | |
8f031519 | 2122 | bool anycast) |
1da177e4 | 2123 | { |
c346dca1 | 2124 | struct net *net = dev_net(idev->dev); |
8b96d22d | 2125 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL); |
f83c7790 | 2126 | int err; |
1da177e4 | 2127 | |
38308473 | 2128 | if (!rt) { |
f3213831 | 2129 | net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
1da177e4 | 2130 | return ERR_PTR(-ENOMEM); |
40385653 | 2131 | } |
1da177e4 | 2132 | |
1da177e4 LT |
2133 | in6_dev_hold(idev); |
2134 | ||
11d53b49 | 2135 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2136 | rt->dst.input = ip6_input; |
2137 | rt->dst.output = ip6_output; | |
1da177e4 | 2138 | rt->rt6i_idev = idev; |
1da177e4 LT |
2139 | |
2140 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2141 | if (anycast) |
2142 | rt->rt6i_flags |= RTF_ANYCAST; | |
2143 | else | |
1da177e4 | 2144 | rt->rt6i_flags |= RTF_LOCAL; |
8ade06c6 | 2145 | err = rt6_bind_neighbour(rt, rt->dst.dev); |
f83c7790 | 2146 | if (err) { |
d8d1f30b | 2147 | dst_free(&rt->dst); |
f83c7790 | 2148 | return ERR_PTR(err); |
1da177e4 LT |
2149 | } |
2150 | ||
4e3fd7a0 | 2151 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2152 | rt->rt6i_dst.plen = 128; |
5578689a | 2153 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2154 | |
d8d1f30b | 2155 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2156 | |
2157 | return rt; | |
2158 | } | |
2159 | ||
c3968a85 DW |
2160 | int ip6_route_get_saddr(struct net *net, |
2161 | struct rt6_info *rt, | |
b71d1d42 | 2162 | const struct in6_addr *daddr, |
c3968a85 DW |
2163 | unsigned int prefs, |
2164 | struct in6_addr *saddr) | |
2165 | { | |
2166 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2167 | int err = 0; | |
2168 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2169 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2170 | else |
2171 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2172 | daddr, prefs, saddr); | |
2173 | return err; | |
2174 | } | |
2175 | ||
2176 | /* remove deleted ip from prefsrc entries */ | |
2177 | struct arg_dev_net_ip { | |
2178 | struct net_device *dev; | |
2179 | struct net *net; | |
2180 | struct in6_addr *addr; | |
2181 | }; | |
2182 | ||
2183 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2184 | { | |
2185 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2186 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2187 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2188 | ||
d1918542 | 2189 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2190 | rt != net->ipv6.ip6_null_entry && |
2191 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2192 | /* remove prefsrc entry */ | |
2193 | rt->rt6i_prefsrc.plen = 0; | |
2194 | } | |
2195 | return 0; | |
2196 | } | |
2197 | ||
2198 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2199 | { | |
2200 | struct net *net = dev_net(ifp->idev->dev); | |
2201 | struct arg_dev_net_ip adni = { | |
2202 | .dev = ifp->idev->dev, | |
2203 | .net = net, | |
2204 | .addr = &ifp->addr, | |
2205 | }; | |
2206 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2207 | } | |
2208 | ||
8ed67789 DL |
2209 | struct arg_dev_net { |
2210 | struct net_device *dev; | |
2211 | struct net *net; | |
2212 | }; | |
2213 | ||
1da177e4 LT |
2214 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2215 | { | |
bc3ef660 | 2216 | const struct arg_dev_net *adn = arg; |
2217 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2218 | |
d1918542 | 2219 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2220 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2221 | return -1; |
c159d30c | 2222 | |
1da177e4 LT |
2223 | return 0; |
2224 | } | |
2225 | ||
f3db4851 | 2226 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2227 | { |
8ed67789 DL |
2228 | struct arg_dev_net adn = { |
2229 | .dev = dev, | |
2230 | .net = net, | |
2231 | }; | |
2232 | ||
2233 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2234 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2235 | } |
2236 | ||
95c96174 | 2237 | struct rt6_mtu_change_arg { |
1da177e4 | 2238 | struct net_device *dev; |
95c96174 | 2239 | unsigned int mtu; |
1da177e4 LT |
2240 | }; |
2241 | ||
2242 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2243 | { | |
2244 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2245 | struct inet6_dev *idev; | |
2246 | ||
2247 | /* In IPv6 pmtu discovery is not optional, | |
2248 | so that RTAX_MTU lock cannot disable it. | |
2249 | We still use this lock to block changes | |
2250 | caused by addrconf/ndisc. | |
2251 | */ | |
2252 | ||
2253 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2254 | if (!idev) |
1da177e4 LT |
2255 | return 0; |
2256 | ||
2257 | /* For administrative MTU increase, there is no way to discover | |
2258 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2259 | Since RFC 1981 doesn't include administrative MTU increase | |
2260 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2261 | */ | |
2262 | /* | |
2263 | If new MTU is less than route PMTU, this new MTU will be the | |
2264 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2265 | decreases; if new MTU is greater than route PMTU, and the | |
2266 | old MTU is the lowest MTU in the path, update the route PMTU | |
2267 | to reflect the increase. In this case if the other nodes' MTU | |
2268 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2269 | PMTU discouvery. | |
2270 | */ | |
d1918542 | 2271 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2272 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2273 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2274 | (dst_mtu(&rt->dst) < arg->mtu && | |
2275 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2276 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2277 | } |
1da177e4 LT |
2278 | return 0; |
2279 | } | |
2280 | ||
95c96174 | 2281 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2282 | { |
c71099ac TG |
2283 | struct rt6_mtu_change_arg arg = { |
2284 | .dev = dev, | |
2285 | .mtu = mtu, | |
2286 | }; | |
1da177e4 | 2287 | |
c346dca1 | 2288 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2289 | } |
2290 | ||
ef7c79ed | 2291 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2292 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2293 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2294 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2295 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2296 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2297 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
86872cb5 TG |
2298 | }; |
2299 | ||
2300 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2301 | struct fib6_config *cfg) | |
1da177e4 | 2302 | { |
86872cb5 TG |
2303 | struct rtmsg *rtm; |
2304 | struct nlattr *tb[RTA_MAX+1]; | |
2305 | int err; | |
1da177e4 | 2306 | |
86872cb5 TG |
2307 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2308 | if (err < 0) | |
2309 | goto errout; | |
1da177e4 | 2310 | |
86872cb5 TG |
2311 | err = -EINVAL; |
2312 | rtm = nlmsg_data(nlh); | |
2313 | memset(cfg, 0, sizeof(*cfg)); | |
2314 | ||
2315 | cfg->fc_table = rtm->rtm_table; | |
2316 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2317 | cfg->fc_src_len = rtm->rtm_src_len; | |
2318 | cfg->fc_flags = RTF_UP; | |
2319 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2320 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2321 | |
ef2c7d7b ND |
2322 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2323 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2324 | rtm->rtm_type == RTN_PROHIBIT || |
2325 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2326 | cfg->fc_flags |= RTF_REJECT; |
2327 | ||
ab79ad14 MŻ |
2328 | if (rtm->rtm_type == RTN_LOCAL) |
2329 | cfg->fc_flags |= RTF_LOCAL; | |
2330 | ||
15e47304 | 2331 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2332 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2333 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2334 | |
2335 | if (tb[RTA_GATEWAY]) { | |
2336 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2337 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2338 | } |
86872cb5 TG |
2339 | |
2340 | if (tb[RTA_DST]) { | |
2341 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2342 | ||
2343 | if (nla_len(tb[RTA_DST]) < plen) | |
2344 | goto errout; | |
2345 | ||
2346 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2347 | } |
86872cb5 TG |
2348 | |
2349 | if (tb[RTA_SRC]) { | |
2350 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2351 | ||
2352 | if (nla_len(tb[RTA_SRC]) < plen) | |
2353 | goto errout; | |
2354 | ||
2355 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2356 | } |
86872cb5 | 2357 | |
c3968a85 DW |
2358 | if (tb[RTA_PREFSRC]) |
2359 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2360 | ||
86872cb5 TG |
2361 | if (tb[RTA_OIF]) |
2362 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2363 | ||
2364 | if (tb[RTA_PRIORITY]) | |
2365 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2366 | ||
2367 | if (tb[RTA_METRICS]) { | |
2368 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2369 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2370 | } |
86872cb5 TG |
2371 | |
2372 | if (tb[RTA_TABLE]) | |
2373 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2374 | ||
51ebd318 ND |
2375 | if (tb[RTA_MULTIPATH]) { |
2376 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2377 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2378 | } | |
2379 | ||
86872cb5 TG |
2380 | err = 0; |
2381 | errout: | |
2382 | return err; | |
1da177e4 LT |
2383 | } |
2384 | ||
51ebd318 ND |
2385 | static int ip6_route_multipath(struct fib6_config *cfg, int add) |
2386 | { | |
2387 | struct fib6_config r_cfg; | |
2388 | struct rtnexthop *rtnh; | |
2389 | int remaining; | |
2390 | int attrlen; | |
2391 | int err = 0, last_err = 0; | |
2392 | ||
2393 | beginning: | |
2394 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2395 | remaining = cfg->fc_mp_len; | |
2396 | ||
2397 | /* Parse a Multipath Entry */ | |
2398 | while (rtnh_ok(rtnh, remaining)) { | |
2399 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2400 | if (rtnh->rtnh_ifindex) | |
2401 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2402 | ||
2403 | attrlen = rtnh_attrlen(rtnh); | |
2404 | if (attrlen > 0) { | |
2405 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2406 | ||
2407 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2408 | if (nla) { | |
2409 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2410 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2411 | } | |
2412 | } | |
2413 | err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); | |
2414 | if (err) { | |
2415 | last_err = err; | |
2416 | /* If we are trying to remove a route, do not stop the | |
2417 | * loop when ip6_route_del() fails (because next hop is | |
2418 | * already gone), we should try to remove all next hops. | |
2419 | */ | |
2420 | if (add) { | |
2421 | /* If add fails, we should try to delete all | |
2422 | * next hops that have been already added. | |
2423 | */ | |
2424 | add = 0; | |
2425 | goto beginning; | |
2426 | } | |
2427 | } | |
1a72418b ND |
2428 | /* Because each route is added like a single route we remove |
2429 | * this flag after the first nexthop (if there is a collision, | |
2430 | * we have already fail to add the first nexthop: | |
2431 | * fib6_add_rt2node() has reject it). | |
2432 | */ | |
2433 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; | |
51ebd318 ND |
2434 | rtnh = rtnh_next(rtnh, &remaining); |
2435 | } | |
2436 | ||
2437 | return last_err; | |
2438 | } | |
2439 | ||
c127ea2c | 2440 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2441 | { |
86872cb5 TG |
2442 | struct fib6_config cfg; |
2443 | int err; | |
1da177e4 | 2444 | |
86872cb5 TG |
2445 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2446 | if (err < 0) | |
2447 | return err; | |
2448 | ||
51ebd318 ND |
2449 | if (cfg.fc_mp) |
2450 | return ip6_route_multipath(&cfg, 0); | |
2451 | else | |
2452 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2453 | } |
2454 | ||
c127ea2c | 2455 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2456 | { |
86872cb5 TG |
2457 | struct fib6_config cfg; |
2458 | int err; | |
1da177e4 | 2459 | |
86872cb5 TG |
2460 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2461 | if (err < 0) | |
2462 | return err; | |
2463 | ||
51ebd318 ND |
2464 | if (cfg.fc_mp) |
2465 | return ip6_route_multipath(&cfg, 1); | |
2466 | else | |
2467 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2468 | } |
2469 | ||
339bf98f TG |
2470 | static inline size_t rt6_nlmsg_size(void) |
2471 | { | |
2472 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2473 | + nla_total_size(16) /* RTA_SRC */ | |
2474 | + nla_total_size(16) /* RTA_DST */ | |
2475 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2476 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2477 | + nla_total_size(4) /* RTA_TABLE */ | |
2478 | + nla_total_size(4) /* RTA_IIF */ | |
2479 | + nla_total_size(4) /* RTA_OIF */ | |
2480 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2481 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2482 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2483 | } | |
2484 | ||
191cd582 BH |
2485 | static int rt6_fill_node(struct net *net, |
2486 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2487 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2488 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2489 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2490 | { |
2491 | struct rtmsg *rtm; | |
2d7202bf | 2492 | struct nlmsghdr *nlh; |
e3703b3d | 2493 | long expires; |
9e762a4a | 2494 | u32 table; |
f2c31e32 | 2495 | struct neighbour *n; |
1da177e4 LT |
2496 | |
2497 | if (prefix) { /* user wants prefix routes only */ | |
2498 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2499 | /* success since this is not a prefix route */ | |
2500 | return 1; | |
2501 | } | |
2502 | } | |
2503 | ||
15e47304 | 2504 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2505 | if (!nlh) |
26932566 | 2506 | return -EMSGSIZE; |
2d7202bf TG |
2507 | |
2508 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2509 | rtm->rtm_family = AF_INET6; |
2510 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2511 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2512 | rtm->rtm_tos = 0; | |
c71099ac | 2513 | if (rt->rt6i_table) |
9e762a4a | 2514 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2515 | else |
9e762a4a PM |
2516 | table = RT6_TABLE_UNSPEC; |
2517 | rtm->rtm_table = table; | |
c78679e8 DM |
2518 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2519 | goto nla_put_failure; | |
ef2c7d7b ND |
2520 | if (rt->rt6i_flags & RTF_REJECT) { |
2521 | switch (rt->dst.error) { | |
2522 | case -EINVAL: | |
2523 | rtm->rtm_type = RTN_BLACKHOLE; | |
2524 | break; | |
2525 | case -EACCES: | |
2526 | rtm->rtm_type = RTN_PROHIBIT; | |
2527 | break; | |
b4949ab2 ND |
2528 | case -EAGAIN: |
2529 | rtm->rtm_type = RTN_THROW; | |
2530 | break; | |
ef2c7d7b ND |
2531 | default: |
2532 | rtm->rtm_type = RTN_UNREACHABLE; | |
2533 | break; | |
2534 | } | |
2535 | } | |
38308473 | 2536 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2537 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2538 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2539 | rtm->rtm_type = RTN_LOCAL; |
2540 | else | |
2541 | rtm->rtm_type = RTN_UNICAST; | |
2542 | rtm->rtm_flags = 0; | |
2543 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2544 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2545 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2546 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2547 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2548 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2549 | rtm->rtm_protocol = RTPROT_RA; | |
2550 | else | |
2551 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2552 | } | |
1da177e4 | 2553 | |
38308473 | 2554 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2555 | rtm->rtm_flags |= RTM_F_CLONED; |
2556 | ||
2557 | if (dst) { | |
c78679e8 DM |
2558 | if (nla_put(skb, RTA_DST, 16, dst)) |
2559 | goto nla_put_failure; | |
1ab1457c | 2560 | rtm->rtm_dst_len = 128; |
1da177e4 | 2561 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2562 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2563 | goto nla_put_failure; | |
1da177e4 LT |
2564 | #ifdef CONFIG_IPV6_SUBTREES |
2565 | if (src) { | |
c78679e8 DM |
2566 | if (nla_put(skb, RTA_SRC, 16, src)) |
2567 | goto nla_put_failure; | |
1ab1457c | 2568 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2569 | } else if (rtm->rtm_src_len && |
2570 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2571 | goto nla_put_failure; | |
1da177e4 | 2572 | #endif |
7bc570c8 YH |
2573 | if (iif) { |
2574 | #ifdef CONFIG_IPV6_MROUTE | |
2575 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2576 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2577 | if (err <= 0) { |
2578 | if (!nowait) { | |
2579 | if (err == 0) | |
2580 | return 0; | |
2581 | goto nla_put_failure; | |
2582 | } else { | |
2583 | if (err == -EMSGSIZE) | |
2584 | goto nla_put_failure; | |
2585 | } | |
2586 | } | |
2587 | } else | |
2588 | #endif | |
c78679e8 DM |
2589 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2590 | goto nla_put_failure; | |
7bc570c8 | 2591 | } else if (dst) { |
1da177e4 | 2592 | struct in6_addr saddr_buf; |
c78679e8 DM |
2593 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2594 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2595 | goto nla_put_failure; | |
1da177e4 | 2596 | } |
2d7202bf | 2597 | |
c3968a85 DW |
2598 | if (rt->rt6i_prefsrc.plen) { |
2599 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2600 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2601 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2602 | goto nla_put_failure; | |
c3968a85 DW |
2603 | } |
2604 | ||
defb3519 | 2605 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2606 | goto nla_put_failure; |
2607 | ||
97cac082 | 2608 | n = rt->n; |
94f826b8 | 2609 | if (n) { |
fdd6681d | 2610 | if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) |
94f826b8 | 2611 | goto nla_put_failure; |
94f826b8 | 2612 | } |
2d7202bf | 2613 | |
c78679e8 DM |
2614 | if (rt->dst.dev && |
2615 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2616 | goto nla_put_failure; | |
2617 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2618 | goto nla_put_failure; | |
8253947e LW |
2619 | |
2620 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2621 | |
87a50699 | 2622 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2623 | goto nla_put_failure; |
2d7202bf TG |
2624 | |
2625 | return nlmsg_end(skb, nlh); | |
2626 | ||
2627 | nla_put_failure: | |
26932566 PM |
2628 | nlmsg_cancel(skb, nlh); |
2629 | return -EMSGSIZE; | |
1da177e4 LT |
2630 | } |
2631 | ||
1b43af54 | 2632 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2633 | { |
2634 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2635 | int prefix; | |
2636 | ||
2d7202bf TG |
2637 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2638 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2639 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2640 | } else | |
2641 | prefix = 0; | |
2642 | ||
191cd582 BH |
2643 | return rt6_fill_node(arg->net, |
2644 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2645 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2646 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2647 | } |
2648 | ||
c127ea2c | 2649 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2650 | { |
3b1e0a65 | 2651 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2652 | struct nlattr *tb[RTA_MAX+1]; |
2653 | struct rt6_info *rt; | |
1da177e4 | 2654 | struct sk_buff *skb; |
ab364a6f | 2655 | struct rtmsg *rtm; |
4c9483b2 | 2656 | struct flowi6 fl6; |
72331bc0 | 2657 | int err, iif = 0, oif = 0; |
1da177e4 | 2658 | |
ab364a6f TG |
2659 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2660 | if (err < 0) | |
2661 | goto errout; | |
1da177e4 | 2662 | |
ab364a6f | 2663 | err = -EINVAL; |
4c9483b2 | 2664 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2665 | |
ab364a6f TG |
2666 | if (tb[RTA_SRC]) { |
2667 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2668 | goto errout; | |
2669 | ||
4e3fd7a0 | 2670 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2671 | } |
2672 | ||
2673 | if (tb[RTA_DST]) { | |
2674 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2675 | goto errout; | |
2676 | ||
4e3fd7a0 | 2677 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2678 | } |
2679 | ||
2680 | if (tb[RTA_IIF]) | |
2681 | iif = nla_get_u32(tb[RTA_IIF]); | |
2682 | ||
2683 | if (tb[RTA_OIF]) | |
72331bc0 | 2684 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2685 | |
2686 | if (iif) { | |
2687 | struct net_device *dev; | |
72331bc0 SL |
2688 | int flags = 0; |
2689 | ||
5578689a | 2690 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2691 | if (!dev) { |
2692 | err = -ENODEV; | |
ab364a6f | 2693 | goto errout; |
1da177e4 | 2694 | } |
72331bc0 SL |
2695 | |
2696 | fl6.flowi6_iif = iif; | |
2697 | ||
2698 | if (!ipv6_addr_any(&fl6.saddr)) | |
2699 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2700 | ||
2701 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2702 | flags); | |
2703 | } else { | |
2704 | fl6.flowi6_oif = oif; | |
2705 | ||
2706 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2707 | } |
2708 | ||
ab364a6f | 2709 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2710 | if (!skb) { |
94e187c0 | 2711 | ip6_rt_put(rt); |
ab364a6f TG |
2712 | err = -ENOBUFS; |
2713 | goto errout; | |
2714 | } | |
1da177e4 | 2715 | |
ab364a6f TG |
2716 | /* Reserve room for dummy headers, this skb can pass |
2717 | through good chunk of routing engine. | |
2718 | */ | |
459a98ed | 2719 | skb_reset_mac_header(skb); |
ab364a6f | 2720 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2721 | |
d8d1f30b | 2722 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2723 | |
4c9483b2 | 2724 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 2725 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 2726 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2727 | if (err < 0) { |
ab364a6f TG |
2728 | kfree_skb(skb); |
2729 | goto errout; | |
1da177e4 LT |
2730 | } |
2731 | ||
15e47304 | 2732 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 2733 | errout: |
1da177e4 | 2734 | return err; |
1da177e4 LT |
2735 | } |
2736 | ||
86872cb5 | 2737 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2738 | { |
2739 | struct sk_buff *skb; | |
5578689a | 2740 | struct net *net = info->nl_net; |
528c4ceb DL |
2741 | u32 seq; |
2742 | int err; | |
2743 | ||
2744 | err = -ENOBUFS; | |
38308473 | 2745 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2746 | |
339bf98f | 2747 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2748 | if (!skb) |
21713ebc TG |
2749 | goto errout; |
2750 | ||
191cd582 | 2751 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 2752 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
2753 | if (err < 0) { |
2754 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2755 | WARN_ON(err == -EMSGSIZE); | |
2756 | kfree_skb(skb); | |
2757 | goto errout; | |
2758 | } | |
15e47304 | 2759 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
2760 | info->nlh, gfp_any()); |
2761 | return; | |
21713ebc TG |
2762 | errout: |
2763 | if (err < 0) | |
5578689a | 2764 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2765 | } |
2766 | ||
8ed67789 DL |
2767 | static int ip6_route_dev_notify(struct notifier_block *this, |
2768 | unsigned long event, void *data) | |
2769 | { | |
2770 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2771 | struct net *net = dev_net(dev); |
8ed67789 DL |
2772 | |
2773 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2774 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2775 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2776 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2777 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2778 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2779 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2780 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2781 | #endif | |
2782 | } | |
2783 | ||
2784 | return NOTIFY_OK; | |
2785 | } | |
2786 | ||
1da177e4 LT |
2787 | /* |
2788 | * /proc | |
2789 | */ | |
2790 | ||
2791 | #ifdef CONFIG_PROC_FS | |
2792 | ||
1da177e4 LT |
2793 | struct rt6_proc_arg |
2794 | { | |
2795 | char *buffer; | |
2796 | int offset; | |
2797 | int length; | |
2798 | int skip; | |
2799 | int len; | |
2800 | }; | |
2801 | ||
2802 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2803 | { | |
33120b30 | 2804 | struct seq_file *m = p_arg; |
69cce1d1 | 2805 | struct neighbour *n; |
1da177e4 | 2806 | |
4b7a4274 | 2807 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2808 | |
2809 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2810 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2811 | #else |
33120b30 | 2812 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2813 | #endif |
97cac082 | 2814 | n = rt->n; |
69cce1d1 DM |
2815 | if (n) { |
2816 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2817 | } else { |
33120b30 | 2818 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2819 | } |
33120b30 | 2820 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2821 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2822 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2823 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2824 | return 0; |
2825 | } | |
2826 | ||
33120b30 | 2827 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2828 | { |
f3db4851 | 2829 | struct net *net = (struct net *)m->private; |
32b293a5 | 2830 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2831 | return 0; |
2832 | } | |
1da177e4 | 2833 | |
33120b30 AD |
2834 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2835 | { | |
de05c557 | 2836 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2837 | } |
2838 | ||
33120b30 AD |
2839 | static const struct file_operations ipv6_route_proc_fops = { |
2840 | .owner = THIS_MODULE, | |
2841 | .open = ipv6_route_open, | |
2842 | .read = seq_read, | |
2843 | .llseek = seq_lseek, | |
b6fcbdb4 | 2844 | .release = single_release_net, |
33120b30 AD |
2845 | }; |
2846 | ||
1da177e4 LT |
2847 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2848 | { | |
69ddb805 | 2849 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2850 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2851 | net->ipv6.rt6_stats->fib_nodes, |
2852 | net->ipv6.rt6_stats->fib_route_nodes, | |
2853 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2854 | net->ipv6.rt6_stats->fib_rt_entries, | |
2855 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2856 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2857 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2858 | |
2859 | return 0; | |
2860 | } | |
2861 | ||
2862 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2863 | { | |
de05c557 | 2864 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2865 | } |
2866 | ||
9a32144e | 2867 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2868 | .owner = THIS_MODULE, |
2869 | .open = rt6_stats_seq_open, | |
2870 | .read = seq_read, | |
2871 | .llseek = seq_lseek, | |
b6fcbdb4 | 2872 | .release = single_release_net, |
1da177e4 LT |
2873 | }; |
2874 | #endif /* CONFIG_PROC_FS */ | |
2875 | ||
2876 | #ifdef CONFIG_SYSCTL | |
2877 | ||
1da177e4 | 2878 | static |
8d65af78 | 2879 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2880 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2881 | { | |
c486da34 LAG |
2882 | struct net *net; |
2883 | int delay; | |
2884 | if (!write) | |
1da177e4 | 2885 | return -EINVAL; |
c486da34 LAG |
2886 | |
2887 | net = (struct net *)ctl->extra1; | |
2888 | delay = net->ipv6.sysctl.flush_delay; | |
2889 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2890 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2891 | return 0; | |
1da177e4 LT |
2892 | } |
2893 | ||
760f2d01 | 2894 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2895 | { |
1da177e4 | 2896 | .procname = "flush", |
4990509f | 2897 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2898 | .maxlen = sizeof(int), |
89c8b3a1 | 2899 | .mode = 0200, |
6d9f239a | 2900 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2901 | }, |
2902 | { | |
1da177e4 | 2903 | .procname = "gc_thresh", |
9a7ec3a9 | 2904 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2905 | .maxlen = sizeof(int), |
2906 | .mode = 0644, | |
6d9f239a | 2907 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2908 | }, |
2909 | { | |
1da177e4 | 2910 | .procname = "max_size", |
4990509f | 2911 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2912 | .maxlen = sizeof(int), |
2913 | .mode = 0644, | |
6d9f239a | 2914 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2915 | }, |
2916 | { | |
1da177e4 | 2917 | .procname = "gc_min_interval", |
4990509f | 2918 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2919 | .maxlen = sizeof(int), |
2920 | .mode = 0644, | |
6d9f239a | 2921 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2922 | }, |
2923 | { | |
1da177e4 | 2924 | .procname = "gc_timeout", |
4990509f | 2925 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2926 | .maxlen = sizeof(int), |
2927 | .mode = 0644, | |
6d9f239a | 2928 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2929 | }, |
2930 | { | |
1da177e4 | 2931 | .procname = "gc_interval", |
4990509f | 2932 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2933 | .maxlen = sizeof(int), |
2934 | .mode = 0644, | |
6d9f239a | 2935 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2936 | }, |
2937 | { | |
1da177e4 | 2938 | .procname = "gc_elasticity", |
4990509f | 2939 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2940 | .maxlen = sizeof(int), |
2941 | .mode = 0644, | |
f3d3f616 | 2942 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2943 | }, |
2944 | { | |
1da177e4 | 2945 | .procname = "mtu_expires", |
4990509f | 2946 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2947 | .maxlen = sizeof(int), |
2948 | .mode = 0644, | |
6d9f239a | 2949 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2950 | }, |
2951 | { | |
1da177e4 | 2952 | .procname = "min_adv_mss", |
4990509f | 2953 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2954 | .maxlen = sizeof(int), |
2955 | .mode = 0644, | |
f3d3f616 | 2956 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2957 | }, |
2958 | { | |
1da177e4 | 2959 | .procname = "gc_min_interval_ms", |
4990509f | 2960 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2961 | .maxlen = sizeof(int), |
2962 | .mode = 0644, | |
6d9f239a | 2963 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2964 | }, |
f8572d8f | 2965 | { } |
1da177e4 LT |
2966 | }; |
2967 | ||
2c8c1e72 | 2968 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2969 | { |
2970 | struct ctl_table *table; | |
2971 | ||
2972 | table = kmemdup(ipv6_route_table_template, | |
2973 | sizeof(ipv6_route_table_template), | |
2974 | GFP_KERNEL); | |
5ee09105 YH |
2975 | |
2976 | if (table) { | |
2977 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2978 | table[0].extra1 = net; |
86393e52 | 2979 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2980 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2981 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2982 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2983 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2984 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2985 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2986 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2987 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
2988 | |
2989 | /* Don't export sysctls to unprivileged users */ | |
2990 | if (net->user_ns != &init_user_ns) | |
2991 | table[0].procname = NULL; | |
5ee09105 YH |
2992 | } |
2993 | ||
760f2d01 DL |
2994 | return table; |
2995 | } | |
1da177e4 LT |
2996 | #endif |
2997 | ||
2c8c1e72 | 2998 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2999 | { |
633d424b | 3000 | int ret = -ENOMEM; |
8ed67789 | 3001 | |
86393e52 AD |
3002 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3003 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3004 | |
fc66f95c ED |
3005 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3006 | goto out_ip6_dst_ops; | |
3007 | ||
8ed67789 DL |
3008 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3009 | sizeof(*net->ipv6.ip6_null_entry), | |
3010 | GFP_KERNEL); | |
3011 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3012 | goto out_ip6_dst_entries; |
d8d1f30b | 3013 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3014 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3015 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3016 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3017 | ip6_template_metrics, true); | |
8ed67789 DL |
3018 | |
3019 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3020 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3021 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3022 | GFP_KERNEL); | |
68fffc67 PZ |
3023 | if (!net->ipv6.ip6_prohibit_entry) |
3024 | goto out_ip6_null_entry; | |
d8d1f30b | 3025 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3026 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3027 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3028 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3029 | ip6_template_metrics, true); | |
8ed67789 DL |
3030 | |
3031 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3032 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3033 | GFP_KERNEL); | |
68fffc67 PZ |
3034 | if (!net->ipv6.ip6_blk_hole_entry) |
3035 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3036 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3037 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3038 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3039 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3040 | ip6_template_metrics, true); | |
8ed67789 DL |
3041 | #endif |
3042 | ||
b339a47c PZ |
3043 | net->ipv6.sysctl.flush_delay = 0; |
3044 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3045 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3046 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3047 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3048 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3049 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3050 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3051 | ||
6891a346 BT |
3052 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3053 | ||
8ed67789 DL |
3054 | ret = 0; |
3055 | out: | |
3056 | return ret; | |
f2fc6a54 | 3057 | |
68fffc67 PZ |
3058 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3059 | out_ip6_prohibit_entry: | |
3060 | kfree(net->ipv6.ip6_prohibit_entry); | |
3061 | out_ip6_null_entry: | |
3062 | kfree(net->ipv6.ip6_null_entry); | |
3063 | #endif | |
fc66f95c ED |
3064 | out_ip6_dst_entries: |
3065 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3066 | out_ip6_dst_ops: |
f2fc6a54 | 3067 | goto out; |
cdb18761 DL |
3068 | } |
3069 | ||
2c8c1e72 | 3070 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3071 | { |
8ed67789 DL |
3072 | kfree(net->ipv6.ip6_null_entry); |
3073 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3074 | kfree(net->ipv6.ip6_prohibit_entry); | |
3075 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3076 | #endif | |
41bb78b4 | 3077 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3078 | } |
3079 | ||
d189634e TG |
3080 | static int __net_init ip6_route_net_init_late(struct net *net) |
3081 | { | |
3082 | #ifdef CONFIG_PROC_FS | |
3083 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
3084 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
3085 | #endif | |
3086 | return 0; | |
3087 | } | |
3088 | ||
3089 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3090 | { | |
3091 | #ifdef CONFIG_PROC_FS | |
3092 | proc_net_remove(net, "ipv6_route"); | |
3093 | proc_net_remove(net, "rt6_stats"); | |
3094 | #endif | |
3095 | } | |
3096 | ||
cdb18761 DL |
3097 | static struct pernet_operations ip6_route_net_ops = { |
3098 | .init = ip6_route_net_init, | |
3099 | .exit = ip6_route_net_exit, | |
3100 | }; | |
3101 | ||
c3426b47 DM |
3102 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3103 | { | |
3104 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3105 | ||
3106 | if (!bp) | |
3107 | return -ENOMEM; | |
3108 | inet_peer_base_init(bp); | |
3109 | net->ipv6.peers = bp; | |
3110 | return 0; | |
3111 | } | |
3112 | ||
3113 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3114 | { | |
3115 | struct inet_peer_base *bp = net->ipv6.peers; | |
3116 | ||
3117 | net->ipv6.peers = NULL; | |
56a6b248 | 3118 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3119 | kfree(bp); |
3120 | } | |
3121 | ||
2b823f72 | 3122 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3123 | .init = ipv6_inetpeer_init, |
3124 | .exit = ipv6_inetpeer_exit, | |
3125 | }; | |
3126 | ||
d189634e TG |
3127 | static struct pernet_operations ip6_route_net_late_ops = { |
3128 | .init = ip6_route_net_init_late, | |
3129 | .exit = ip6_route_net_exit_late, | |
3130 | }; | |
3131 | ||
8ed67789 DL |
3132 | static struct notifier_block ip6_route_dev_notifier = { |
3133 | .notifier_call = ip6_route_dev_notify, | |
3134 | .priority = 0, | |
3135 | }; | |
3136 | ||
433d49c3 | 3137 | int __init ip6_route_init(void) |
1da177e4 | 3138 | { |
433d49c3 DL |
3139 | int ret; |
3140 | ||
9a7ec3a9 DL |
3141 | ret = -ENOMEM; |
3142 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3143 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3144 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3145 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3146 | goto out; |
14e50e57 | 3147 | |
fc66f95c | 3148 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3149 | if (ret) |
bdb3289f | 3150 | goto out_kmem_cache; |
bdb3289f | 3151 | |
c3426b47 DM |
3152 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3153 | if (ret) | |
e8803b6c | 3154 | goto out_dst_entries; |
2a0c451a | 3155 | |
7e52b33b DM |
3156 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3157 | if (ret) | |
3158 | goto out_register_inetpeer; | |
c3426b47 | 3159 | |
5dc121e9 AE |
3160 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3161 | ||
8ed67789 DL |
3162 | /* Registering of the loopback is done before this portion of code, |
3163 | * the loopback reference in rt6_info will not be taken, do it | |
3164 | * manually for init_net */ | |
d8d1f30b | 3165 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3166 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3167 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3168 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3169 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3170 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3171 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3172 | #endif | |
e8803b6c | 3173 | ret = fib6_init(); |
433d49c3 | 3174 | if (ret) |
8ed67789 | 3175 | goto out_register_subsys; |
433d49c3 | 3176 | |
433d49c3 DL |
3177 | ret = xfrm6_init(); |
3178 | if (ret) | |
e8803b6c | 3179 | goto out_fib6_init; |
c35b7e72 | 3180 | |
433d49c3 DL |
3181 | ret = fib6_rules_init(); |
3182 | if (ret) | |
3183 | goto xfrm6_init; | |
7e5449c2 | 3184 | |
d189634e TG |
3185 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3186 | if (ret) | |
3187 | goto fib6_rules_init; | |
3188 | ||
433d49c3 | 3189 | ret = -ENOBUFS; |
c7ac8679 GR |
3190 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3191 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3192 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3193 | goto out_register_late_subsys; |
c127ea2c | 3194 | |
8ed67789 | 3195 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3196 | if (ret) |
d189634e | 3197 | goto out_register_late_subsys; |
8ed67789 | 3198 | |
433d49c3 DL |
3199 | out: |
3200 | return ret; | |
3201 | ||
d189634e TG |
3202 | out_register_late_subsys: |
3203 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3204 | fib6_rules_init: |
433d49c3 DL |
3205 | fib6_rules_cleanup(); |
3206 | xfrm6_init: | |
433d49c3 | 3207 | xfrm6_fini(); |
2a0c451a TG |
3208 | out_fib6_init: |
3209 | fib6_gc_cleanup(); | |
8ed67789 DL |
3210 | out_register_subsys: |
3211 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3212 | out_register_inetpeer: |
3213 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3214 | out_dst_entries: |
3215 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3216 | out_kmem_cache: |
f2fc6a54 | 3217 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3218 | goto out; |
1da177e4 LT |
3219 | } |
3220 | ||
3221 | void ip6_route_cleanup(void) | |
3222 | { | |
8ed67789 | 3223 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3224 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3225 | fib6_rules_cleanup(); |
1da177e4 | 3226 | xfrm6_fini(); |
1da177e4 | 3227 | fib6_gc_cleanup(); |
c3426b47 | 3228 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3229 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3230 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3231 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3232 | } |