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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
f3213831 JP |
27 | #define pr_fmt(fmt) "IPv6: " fmt |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 | 30 | #include <linux/errno.h> |
bc3b2d7f | 31 | #include <linux/export.h> |
1da177e4 LT |
32 | #include <linux/types.h> |
33 | #include <linux/times.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/net.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/in6.h> | |
7bc570c8 | 40 | #include <linux/mroute6.h> |
1da177e4 | 41 | #include <linux/init.h> |
1da177e4 | 42 | #include <linux/if_arp.h> |
1da177e4 LT |
43 | #include <linux/proc_fs.h> |
44 | #include <linux/seq_file.h> | |
5b7c931d | 45 | #include <linux/nsproxy.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/snmp.h> |
49 | #include <net/ipv6.h> | |
50 | #include <net/ip6_fib.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ndisc.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/tcp.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <net/dst.h> | |
57 | #include <net/xfrm.h> | |
8d71740c | 58 | #include <net/netevent.h> |
21713ebc | 59 | #include <net/netlink.h> |
51ebd318 | 60 | #include <net/nexthop.h> |
1da177e4 LT |
61 | |
62 | #include <asm/uaccess.h> | |
63 | ||
64 | #ifdef CONFIG_SYSCTL | |
65 | #include <linux/sysctl.h> | |
66 | #endif | |
67 | ||
afc154e9 | 68 | enum rt6_nud_state { |
7e980569 JB |
69 | RT6_NUD_FAIL_HARD = -3, |
70 | RT6_NUD_FAIL_PROBE = -2, | |
71 | RT6_NUD_FAIL_DO_RR = -1, | |
afc154e9 HFS |
72 | RT6_NUD_SUCCEED = 1 |
73 | }; | |
74 | ||
1716a961 | 75 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 76 | const struct in6_addr *dest); |
1da177e4 | 77 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 78 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 79 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
80 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
81 | static void ip6_dst_destroy(struct dst_entry *); | |
82 | static void ip6_dst_ifdown(struct dst_entry *, | |
83 | struct net_device *dev, int how); | |
569d3645 | 84 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
85 | |
86 | static int ip6_pkt_discard(struct sk_buff *skb); | |
87 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
7150aede K |
88 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
89 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
1da177e4 | 90 | static void ip6_link_failure(struct sk_buff *skb); |
6700c270 DM |
91 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
92 | struct sk_buff *skb, u32 mtu); | |
93 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
94 | struct sk_buff *skb); | |
52bd4c0c | 95 | static int rt6_score_route(struct rt6_info *rt, int oif, int strict); |
1da177e4 | 96 | |
70ceb4f5 | 97 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 98 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
99 | const struct in6_addr *prefix, int prefixlen, |
100 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 101 | unsigned int pref); |
efa2cea0 | 102 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
103 | const struct in6_addr *prefix, int prefixlen, |
104 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
105 | #endif |
106 | ||
e8243534 | 107 | static void rt6_bind_peer(struct rt6_info *rt, int create) |
108 | { | |
109 | struct inet_peer_base *base; | |
110 | struct inet_peer *peer; | |
111 | ||
112 | base = inetpeer_base_ptr(rt->_rt6i_peer); | |
113 | if (!base) | |
114 | return; | |
115 | ||
116 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
117 | if (peer) { | |
118 | if (!rt6_set_peer(rt, peer)) | |
119 | inet_putpeer(peer); | |
120 | } | |
121 | } | |
122 | ||
123 | static struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create) | |
124 | { | |
125 | if (rt6_has_peer(rt)) | |
126 | return rt6_peer_ptr(rt); | |
127 | ||
128 | rt6_bind_peer(rt, create); | |
129 | return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL); | |
130 | } | |
131 | ||
132 | static struct inet_peer *rt6_get_peer_create(struct rt6_info *rt) | |
133 | { | |
134 | return __rt6_get_peer(rt, 1); | |
135 | } | |
136 | ||
06582540 DM |
137 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
138 | { | |
139 | struct rt6_info *rt = (struct rt6_info *) dst; | |
140 | struct inet_peer *peer; | |
141 | u32 *p = NULL; | |
142 | ||
8e2ec639 YZ |
143 | if (!(rt->dst.flags & DST_HOST)) |
144 | return NULL; | |
145 | ||
fbfe95a4 | 146 | peer = rt6_get_peer_create(rt); |
06582540 DM |
147 | if (peer) { |
148 | u32 *old_p = __DST_METRICS_PTR(old); | |
149 | unsigned long prev, new; | |
150 | ||
151 | p = peer->metrics; | |
152 | if (inet_metrics_new(peer)) | |
153 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
154 | ||
155 | new = (unsigned long) p; | |
156 | prev = cmpxchg(&dst->_metrics, old, new); | |
157 | ||
158 | if (prev != old) { | |
159 | p = __DST_METRICS_PTR(prev); | |
160 | if (prev & DST_METRICS_READ_ONLY) | |
161 | p = NULL; | |
162 | } | |
163 | } | |
164 | return p; | |
165 | } | |
166 | ||
f894cbf8 DM |
167 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
168 | struct sk_buff *skb, | |
169 | const void *daddr) | |
39232973 DM |
170 | { |
171 | struct in6_addr *p = &rt->rt6i_gateway; | |
172 | ||
a7563f34 | 173 | if (!ipv6_addr_any(p)) |
39232973 | 174 | return (const void *) p; |
f894cbf8 DM |
175 | else if (skb) |
176 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
177 | return daddr; |
178 | } | |
179 | ||
f894cbf8 DM |
180 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
181 | struct sk_buff *skb, | |
182 | const void *daddr) | |
d3aaeb38 | 183 | { |
39232973 DM |
184 | struct rt6_info *rt = (struct rt6_info *) dst; |
185 | struct neighbour *n; | |
186 | ||
f894cbf8 | 187 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 188 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
189 | if (n) |
190 | return n; | |
191 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
192 | } | |
193 | ||
9a7ec3a9 | 194 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 195 | .family = AF_INET6, |
09640e63 | 196 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
197 | .gc = ip6_dst_gc, |
198 | .gc_thresh = 1024, | |
199 | .check = ip6_dst_check, | |
0dbaee3b | 200 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 201 | .mtu = ip6_mtu, |
06582540 | 202 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
203 | .destroy = ip6_dst_destroy, |
204 | .ifdown = ip6_dst_ifdown, | |
205 | .negative_advice = ip6_negative_advice, | |
206 | .link_failure = ip6_link_failure, | |
207 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 208 | .redirect = rt6_do_redirect, |
1ac06e03 | 209 | .local_out = __ip6_local_out, |
d3aaeb38 | 210 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
211 | }; |
212 | ||
ebb762f2 | 213 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 214 | { |
618f9bc7 SK |
215 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
216 | ||
217 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
218 | } |
219 | ||
6700c270 DM |
220 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
221 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
222 | { |
223 | } | |
224 | ||
6700c270 DM |
225 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
226 | struct sk_buff *skb) | |
b587ee3b DM |
227 | { |
228 | } | |
229 | ||
0972ddb2 HB |
230 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
231 | unsigned long old) | |
232 | { | |
233 | return NULL; | |
234 | } | |
235 | ||
14e50e57 DM |
236 | static struct dst_ops ip6_dst_blackhole_ops = { |
237 | .family = AF_INET6, | |
09640e63 | 238 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
239 | .destroy = ip6_dst_destroy, |
240 | .check = ip6_dst_check, | |
ebb762f2 | 241 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 242 | .default_advmss = ip6_default_advmss, |
14e50e57 | 243 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 244 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 245 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 246 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
247 | }; |
248 | ||
62fa8a84 | 249 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 250 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
251 | }; |
252 | ||
fb0af4c7 | 253 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
254 | .dst = { |
255 | .__refcnt = ATOMIC_INIT(1), | |
256 | .__use = 1, | |
2c20cbd7 | 257 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 258 | .error = -ENETUNREACH, |
d8d1f30b CG |
259 | .input = ip6_pkt_discard, |
260 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
261 | }, |
262 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 263 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
264 | .rt6i_metric = ~(u32) 0, |
265 | .rt6i_ref = ATOMIC_INIT(1), | |
266 | }; | |
267 | ||
101367c2 TG |
268 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
269 | ||
fb0af4c7 | 270 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
271 | .dst = { |
272 | .__refcnt = ATOMIC_INIT(1), | |
273 | .__use = 1, | |
2c20cbd7 | 274 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 275 | .error = -EACCES, |
d8d1f30b CG |
276 | .input = ip6_pkt_prohibit, |
277 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
278 | }, |
279 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 280 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
281 | .rt6i_metric = ~(u32) 0, |
282 | .rt6i_ref = ATOMIC_INIT(1), | |
283 | }; | |
284 | ||
fb0af4c7 | 285 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
286 | .dst = { |
287 | .__refcnt = ATOMIC_INIT(1), | |
288 | .__use = 1, | |
2c20cbd7 | 289 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 290 | .error = -EINVAL, |
d8d1f30b CG |
291 | .input = dst_discard, |
292 | .output = dst_discard, | |
101367c2 TG |
293 | }, |
294 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 295 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
296 | .rt6i_metric = ~(u32) 0, |
297 | .rt6i_ref = ATOMIC_INIT(1), | |
298 | }; | |
299 | ||
300 | #endif | |
301 | ||
1da177e4 | 302 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 303 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 304 | struct net_device *dev, |
8b96d22d DM |
305 | int flags, |
306 | struct fib6_table *table) | |
1da177e4 | 307 | { |
97bab73f | 308 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 309 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 310 | |
97bab73f | 311 | if (rt) { |
8104891b SK |
312 | struct dst_entry *dst = &rt->dst; |
313 | ||
314 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
8b96d22d | 315 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
ca4c3fc2 | 316 | rt->rt6i_genid = rt_genid_ipv6(net); |
51ebd318 | 317 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
97bab73f | 318 | } |
cf911662 | 319 | return rt; |
1da177e4 LT |
320 | } |
321 | ||
322 | static void ip6_dst_destroy(struct dst_entry *dst) | |
323 | { | |
324 | struct rt6_info *rt = (struct rt6_info *)dst; | |
325 | struct inet6_dev *idev = rt->rt6i_idev; | |
ecd98837 | 326 | struct dst_entry *from = dst->from; |
1da177e4 | 327 | |
8e2ec639 YZ |
328 | if (!(rt->dst.flags & DST_HOST)) |
329 | dst_destroy_metrics_generic(dst); | |
330 | ||
38308473 | 331 | if (idev) { |
1da177e4 LT |
332 | rt->rt6i_idev = NULL; |
333 | in6_dev_put(idev); | |
1ab1457c | 334 | } |
1716a961 | 335 | |
ecd98837 YH |
336 | dst->from = NULL; |
337 | dst_release(from); | |
1716a961 | 338 | |
97bab73f DM |
339 | if (rt6_has_peer(rt)) { |
340 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
341 | inet_putpeer(peer); |
342 | } | |
343 | } | |
344 | ||
1da177e4 LT |
345 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
346 | int how) | |
347 | { | |
348 | struct rt6_info *rt = (struct rt6_info *)dst; | |
349 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 350 | struct net_device *loopback_dev = |
c346dca1 | 351 | dev_net(dev)->loopback_dev; |
1da177e4 | 352 | |
97cac082 DM |
353 | if (dev != loopback_dev) { |
354 | if (idev && idev->dev == dev) { | |
355 | struct inet6_dev *loopback_idev = | |
356 | in6_dev_get(loopback_dev); | |
357 | if (loopback_idev) { | |
358 | rt->rt6i_idev = loopback_idev; | |
359 | in6_dev_put(idev); | |
360 | } | |
361 | } | |
1da177e4 LT |
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 | ||
c08977bb YH |
391 | val ^= ipv6_addr_hash(&fl6->daddr); |
392 | val ^= ipv6_addr_hash(&fl6->saddr); | |
51ebd318 ND |
393 | |
394 | /* Work only if this not encapsulated */ | |
395 | switch (fl6->flowi6_proto) { | |
396 | case IPPROTO_UDP: | |
397 | case IPPROTO_TCP: | |
398 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
399 | val ^= (__force u16)fl6->fl6_sport; |
400 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
401 | break; |
402 | ||
403 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
404 | val ^= (__force u16)fl6->fl6_icmp_type; |
405 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
406 | break; |
407 | } | |
408 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 409 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
410 | |
411 | /* Perhaps, we need to tune, this function? */ | |
412 | val = val ^ (val >> 7) ^ (val >> 12); | |
413 | return val % candidate_count; | |
414 | } | |
415 | ||
416 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
52bd4c0c ND |
417 | struct flowi6 *fl6, int oif, |
418 | int strict) | |
51ebd318 ND |
419 | { |
420 | struct rt6_info *sibling, *next_sibling; | |
421 | int route_choosen; | |
422 | ||
423 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
424 | /* Don't change the route, if route_choosen == 0 | |
425 | * (siblings does not include ourself) | |
426 | */ | |
427 | if (route_choosen) | |
428 | list_for_each_entry_safe(sibling, next_sibling, | |
429 | &match->rt6i_siblings, rt6i_siblings) { | |
430 | route_choosen--; | |
431 | if (route_choosen == 0) { | |
52bd4c0c ND |
432 | if (rt6_score_route(sibling, oif, strict) < 0) |
433 | break; | |
51ebd318 ND |
434 | match = sibling; |
435 | break; | |
436 | } | |
437 | } | |
438 | return match; | |
439 | } | |
440 | ||
1da177e4 | 441 | /* |
c71099ac | 442 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
443 | */ |
444 | ||
8ed67789 DL |
445 | static inline struct rt6_info *rt6_device_match(struct net *net, |
446 | struct rt6_info *rt, | |
b71d1d42 | 447 | const struct in6_addr *saddr, |
1da177e4 | 448 | int oif, |
d420895e | 449 | int flags) |
1da177e4 LT |
450 | { |
451 | struct rt6_info *local = NULL; | |
452 | struct rt6_info *sprt; | |
453 | ||
dd3abc4e YH |
454 | if (!oif && ipv6_addr_any(saddr)) |
455 | goto out; | |
456 | ||
d8d1f30b | 457 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 458 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
459 | |
460 | if (oif) { | |
1da177e4 LT |
461 | if (dev->ifindex == oif) |
462 | return sprt; | |
463 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 464 | if (!sprt->rt6i_idev || |
1da177e4 | 465 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 466 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 467 | continue; |
1ab1457c | 468 | if (local && (!oif || |
1da177e4 LT |
469 | local->rt6i_idev->dev->ifindex == oif)) |
470 | continue; | |
471 | } | |
472 | local = sprt; | |
473 | } | |
dd3abc4e YH |
474 | } else { |
475 | if (ipv6_chk_addr(net, saddr, dev, | |
476 | flags & RT6_LOOKUP_F_IFACE)) | |
477 | return sprt; | |
1da177e4 | 478 | } |
dd3abc4e | 479 | } |
1da177e4 | 480 | |
dd3abc4e | 481 | if (oif) { |
1da177e4 LT |
482 | if (local) |
483 | return local; | |
484 | ||
d420895e | 485 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 486 | return net->ipv6.ip6_null_entry; |
1da177e4 | 487 | } |
dd3abc4e | 488 | out: |
1da177e4 LT |
489 | return rt; |
490 | } | |
491 | ||
27097255 | 492 | #ifdef CONFIG_IPV6_ROUTER_PREF |
c2f17e82 HFS |
493 | struct __rt6_probe_work { |
494 | struct work_struct work; | |
495 | struct in6_addr target; | |
496 | struct net_device *dev; | |
497 | }; | |
498 | ||
499 | static void rt6_probe_deferred(struct work_struct *w) | |
500 | { | |
501 | struct in6_addr mcaddr; | |
502 | struct __rt6_probe_work *work = | |
503 | container_of(w, struct __rt6_probe_work, work); | |
504 | ||
505 | addrconf_addr_solict_mult(&work->target, &mcaddr); | |
506 | ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); | |
507 | dev_put(work->dev); | |
508 | kfree(w); | |
509 | } | |
510 | ||
27097255 YH |
511 | static void rt6_probe(struct rt6_info *rt) |
512 | { | |
f2c31e32 | 513 | struct neighbour *neigh; |
27097255 YH |
514 | /* |
515 | * Okay, this does not seem to be appropriate | |
516 | * for now, however, we need to check if it | |
517 | * is really so; aka Router Reachability Probing. | |
518 | * | |
519 | * Router Reachability Probe MUST be rate-limited | |
520 | * to no more than one per minute. | |
521 | */ | |
2152caea | 522 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 523 | return; |
2152caea YH |
524 | rcu_read_lock_bh(); |
525 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
526 | if (neigh) { | |
527 | write_lock(&neigh->lock); | |
528 | if (neigh->nud_state & NUD_VALID) | |
529 | goto out; | |
7ff74a59 | 530 | } |
2152caea YH |
531 | |
532 | if (!neigh || | |
52e16356 | 533 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
c2f17e82 | 534 | struct __rt6_probe_work *work; |
27097255 | 535 | |
c2f17e82 HFS |
536 | work = kmalloc(sizeof(*work), GFP_ATOMIC); |
537 | ||
538 | if (neigh && work) | |
7e980569 | 539 | __neigh_set_probe_once(neigh); |
c2f17e82 HFS |
540 | |
541 | if (neigh) | |
2152caea YH |
542 | write_unlock(&neigh->lock); |
543 | ||
c2f17e82 HFS |
544 | if (work) { |
545 | INIT_WORK(&work->work, rt6_probe_deferred); | |
546 | work->target = rt->rt6i_gateway; | |
547 | dev_hold(rt->dst.dev); | |
548 | work->dev = rt->dst.dev; | |
549 | schedule_work(&work->work); | |
550 | } | |
f2c31e32 | 551 | } else { |
2152caea YH |
552 | out: |
553 | write_unlock(&neigh->lock); | |
f2c31e32 | 554 | } |
2152caea | 555 | rcu_read_unlock_bh(); |
27097255 YH |
556 | } |
557 | #else | |
558 | static inline void rt6_probe(struct rt6_info *rt) | |
559 | { | |
27097255 YH |
560 | } |
561 | #endif | |
562 | ||
1da177e4 | 563 | /* |
554cfb7e | 564 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 565 | */ |
b6f99a21 | 566 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 567 | { |
d1918542 | 568 | struct net_device *dev = rt->dst.dev; |
161980f4 | 569 | if (!oif || dev->ifindex == oif) |
554cfb7e | 570 | return 2; |
161980f4 DM |
571 | if ((dev->flags & IFF_LOOPBACK) && |
572 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
573 | return 1; | |
574 | return 0; | |
554cfb7e | 575 | } |
1da177e4 | 576 | |
afc154e9 | 577 | static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 578 | { |
f2c31e32 | 579 | struct neighbour *neigh; |
afc154e9 | 580 | enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; |
f2c31e32 | 581 | |
4d0c5911 YH |
582 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
583 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
afc154e9 | 584 | return RT6_NUD_SUCCEED; |
145a3621 YH |
585 | |
586 | rcu_read_lock_bh(); | |
587 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
588 | if (neigh) { | |
589 | read_lock(&neigh->lock); | |
554cfb7e | 590 | if (neigh->nud_state & NUD_VALID) |
afc154e9 | 591 | ret = RT6_NUD_SUCCEED; |
398bcbeb | 592 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b | 593 | else if (!(neigh->nud_state & NUD_FAILED)) |
afc154e9 | 594 | ret = RT6_NUD_SUCCEED; |
7e980569 JB |
595 | else |
596 | ret = RT6_NUD_FAIL_PROBE; | |
398bcbeb | 597 | #endif |
145a3621 | 598 | read_unlock(&neigh->lock); |
afc154e9 HFS |
599 | } else { |
600 | ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? | |
7e980569 | 601 | RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; |
a5a81f0b | 602 | } |
145a3621 YH |
603 | rcu_read_unlock_bh(); |
604 | ||
a5a81f0b | 605 | return ret; |
1da177e4 LT |
606 | } |
607 | ||
554cfb7e YH |
608 | static int rt6_score_route(struct rt6_info *rt, int oif, |
609 | int strict) | |
1da177e4 | 610 | { |
a5a81f0b | 611 | int m; |
1ab1457c | 612 | |
4d0c5911 | 613 | m = rt6_check_dev(rt, oif); |
77d16f45 | 614 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
afc154e9 | 615 | return RT6_NUD_FAIL_HARD; |
ebacaaa0 YH |
616 | #ifdef CONFIG_IPV6_ROUTER_PREF |
617 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
618 | #endif | |
afc154e9 HFS |
619 | if (strict & RT6_LOOKUP_F_REACHABLE) { |
620 | int n = rt6_check_neigh(rt); | |
621 | if (n < 0) | |
622 | return n; | |
623 | } | |
554cfb7e YH |
624 | return m; |
625 | } | |
626 | ||
f11e6659 | 627 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
afc154e9 HFS |
628 | int *mpri, struct rt6_info *match, |
629 | bool *do_rr) | |
554cfb7e | 630 | { |
f11e6659 | 631 | int m; |
afc154e9 | 632 | bool match_do_rr = false; |
f11e6659 DM |
633 | |
634 | if (rt6_check_expired(rt)) | |
635 | goto out; | |
636 | ||
637 | m = rt6_score_route(rt, oif, strict); | |
7e980569 | 638 | if (m == RT6_NUD_FAIL_DO_RR) { |
afc154e9 HFS |
639 | match_do_rr = true; |
640 | m = 0; /* lowest valid score */ | |
7e980569 | 641 | } else if (m == RT6_NUD_FAIL_HARD) { |
f11e6659 | 642 | goto out; |
afc154e9 HFS |
643 | } |
644 | ||
645 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
646 | rt6_probe(rt); | |
f11e6659 | 647 | |
7e980569 | 648 | /* note that m can be RT6_NUD_FAIL_PROBE at this point */ |
f11e6659 | 649 | if (m > *mpri) { |
afc154e9 | 650 | *do_rr = match_do_rr; |
f11e6659 DM |
651 | *mpri = m; |
652 | match = rt; | |
f11e6659 | 653 | } |
f11e6659 DM |
654 | out: |
655 | return match; | |
656 | } | |
657 | ||
658 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
659 | struct rt6_info *rr_head, | |
afc154e9 HFS |
660 | u32 metric, int oif, int strict, |
661 | bool *do_rr) | |
f11e6659 DM |
662 | { |
663 | struct rt6_info *rt, *match; | |
554cfb7e | 664 | int mpri = -1; |
1da177e4 | 665 | |
f11e6659 DM |
666 | match = NULL; |
667 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 668 | rt = rt->dst.rt6_next) |
afc154e9 | 669 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
f11e6659 | 670 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; |
d8d1f30b | 671 | rt = rt->dst.rt6_next) |
afc154e9 | 672 | match = find_match(rt, oif, strict, &mpri, match, do_rr); |
1da177e4 | 673 | |
f11e6659 DM |
674 | return match; |
675 | } | |
1da177e4 | 676 | |
f11e6659 DM |
677 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
678 | { | |
679 | struct rt6_info *match, *rt0; | |
8ed67789 | 680 | struct net *net; |
afc154e9 | 681 | bool do_rr = false; |
1da177e4 | 682 | |
f11e6659 DM |
683 | rt0 = fn->rr_ptr; |
684 | if (!rt0) | |
685 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 686 | |
afc154e9 HFS |
687 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, |
688 | &do_rr); | |
1da177e4 | 689 | |
afc154e9 | 690 | if (do_rr) { |
d8d1f30b | 691 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 692 | |
554cfb7e | 693 | /* no entries matched; do round-robin */ |
f11e6659 DM |
694 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
695 | next = fn->leaf; | |
696 | ||
697 | if (next != rt0) | |
698 | fn->rr_ptr = next; | |
1da177e4 | 699 | } |
1da177e4 | 700 | |
d1918542 | 701 | net = dev_net(rt0->dst.dev); |
a02cec21 | 702 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
703 | } |
704 | ||
70ceb4f5 YH |
705 | #ifdef CONFIG_IPV6_ROUTE_INFO |
706 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 707 | const struct in6_addr *gwaddr) |
70ceb4f5 | 708 | { |
c346dca1 | 709 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
710 | struct route_info *rinfo = (struct route_info *) opt; |
711 | struct in6_addr prefix_buf, *prefix; | |
712 | unsigned int pref; | |
4bed72e4 | 713 | unsigned long lifetime; |
70ceb4f5 YH |
714 | struct rt6_info *rt; |
715 | ||
716 | if (len < sizeof(struct route_info)) { | |
717 | return -EINVAL; | |
718 | } | |
719 | ||
720 | /* Sanity check for prefix_len and length */ | |
721 | if (rinfo->length > 3) { | |
722 | return -EINVAL; | |
723 | } else if (rinfo->prefix_len > 128) { | |
724 | return -EINVAL; | |
725 | } else if (rinfo->prefix_len > 64) { | |
726 | if (rinfo->length < 2) { | |
727 | return -EINVAL; | |
728 | } | |
729 | } else if (rinfo->prefix_len > 0) { | |
730 | if (rinfo->length < 1) { | |
731 | return -EINVAL; | |
732 | } | |
733 | } | |
734 | ||
735 | pref = rinfo->route_pref; | |
736 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 737 | return -EINVAL; |
70ceb4f5 | 738 | |
4bed72e4 | 739 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
740 | |
741 | if (rinfo->length == 3) | |
742 | prefix = (struct in6_addr *)rinfo->prefix; | |
743 | else { | |
744 | /* this function is safe */ | |
745 | ipv6_addr_prefix(&prefix_buf, | |
746 | (struct in6_addr *)rinfo->prefix, | |
747 | rinfo->prefix_len); | |
748 | prefix = &prefix_buf; | |
749 | } | |
750 | ||
f104a567 DJ |
751 | if (rinfo->prefix_len == 0) |
752 | rt = rt6_get_dflt_router(gwaddr, dev); | |
753 | else | |
754 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, | |
755 | gwaddr, dev->ifindex); | |
70ceb4f5 YH |
756 | |
757 | if (rt && !lifetime) { | |
e0a1ad73 | 758 | ip6_del_rt(rt); |
70ceb4f5 YH |
759 | rt = NULL; |
760 | } | |
761 | ||
762 | if (!rt && lifetime) | |
efa2cea0 | 763 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
764 | pref); |
765 | else if (rt) | |
766 | rt->rt6i_flags = RTF_ROUTEINFO | | |
767 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
768 | ||
769 | if (rt) { | |
1716a961 G |
770 | if (!addrconf_finite_timeout(lifetime)) |
771 | rt6_clean_expires(rt); | |
772 | else | |
773 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
774 | ||
94e187c0 | 775 | ip6_rt_put(rt); |
70ceb4f5 YH |
776 | } |
777 | return 0; | |
778 | } | |
779 | #endif | |
780 | ||
8ed67789 | 781 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 782 | do { \ |
8ed67789 | 783 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 784 | struct fib6_node *pn; \ |
e0eda7bb | 785 | while (1) { \ |
982f56f3 YH |
786 | if (fn->fn_flags & RTN_TL_ROOT) \ |
787 | goto out; \ | |
788 | pn = fn->parent; \ | |
789 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 790 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
791 | else \ |
792 | fn = pn; \ | |
793 | if (fn->fn_flags & RTN_RTINFO) \ | |
794 | goto restart; \ | |
c71099ac | 795 | } \ |
c71099ac | 796 | } \ |
38308473 | 797 | } while (0) |
c71099ac | 798 | |
8ed67789 DL |
799 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
800 | struct fib6_table *table, | |
4c9483b2 | 801 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
802 | { |
803 | struct fib6_node *fn; | |
804 | struct rt6_info *rt; | |
805 | ||
c71099ac | 806 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 807 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
808 | restart: |
809 | rt = fn->leaf; | |
4c9483b2 | 810 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 | 811 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
52bd4c0c | 812 | rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); |
4c9483b2 | 813 | BACKTRACK(net, &fl6->saddr); |
c71099ac | 814 | out: |
d8d1f30b | 815 | dst_use(&rt->dst, jiffies); |
c71099ac | 816 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
817 | return rt; |
818 | ||
819 | } | |
820 | ||
ea6e574e FW |
821 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
822 | int flags) | |
823 | { | |
824 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
825 | } | |
826 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
827 | ||
9acd9f3a YH |
828 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
829 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 830 | { |
4c9483b2 DM |
831 | struct flowi6 fl6 = { |
832 | .flowi6_oif = oif, | |
833 | .daddr = *daddr, | |
c71099ac TG |
834 | }; |
835 | struct dst_entry *dst; | |
77d16f45 | 836 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 837 | |
adaa70bb | 838 | if (saddr) { |
4c9483b2 | 839 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
840 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
841 | } | |
842 | ||
4c9483b2 | 843 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
844 | if (dst->error == 0) |
845 | return (struct rt6_info *) dst; | |
846 | ||
847 | dst_release(dst); | |
848 | ||
1da177e4 LT |
849 | return NULL; |
850 | } | |
851 | ||
7159039a YH |
852 | EXPORT_SYMBOL(rt6_lookup); |
853 | ||
c71099ac | 854 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
855 | It takes new route entry, the addition fails by any reason the |
856 | route is freed. In any case, if caller does not hold it, it may | |
857 | be destroyed. | |
858 | */ | |
859 | ||
86872cb5 | 860 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
861 | { |
862 | int err; | |
c71099ac | 863 | struct fib6_table *table; |
1da177e4 | 864 | |
c71099ac TG |
865 | table = rt->rt6i_table; |
866 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 867 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 868 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
869 | |
870 | return err; | |
871 | } | |
872 | ||
40e22e8f TG |
873 | int ip6_ins_rt(struct rt6_info *rt) |
874 | { | |
4d1169c1 | 875 | struct nl_info info = { |
d1918542 | 876 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 877 | }; |
528c4ceb | 878 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
879 | } |
880 | ||
1716a961 | 881 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 882 | const struct in6_addr *daddr, |
b71d1d42 | 883 | const struct in6_addr *saddr) |
1da177e4 | 884 | { |
1da177e4 LT |
885 | struct rt6_info *rt; |
886 | ||
887 | /* | |
888 | * Clone the route. | |
889 | */ | |
890 | ||
21efcfa0 | 891 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
892 | |
893 | if (rt) { | |
249a3630 DJ |
894 | if (ort->rt6i_dst.plen != 128 && |
895 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) | |
896 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 897 | |
1da177e4 | 898 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
899 | |
900 | #ifdef CONFIG_IPV6_SUBTREES | |
901 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 902 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
903 | rt->rt6i_src.plen = 128; |
904 | } | |
905 | #endif | |
95a9a5ba | 906 | } |
1da177e4 | 907 | |
95a9a5ba YH |
908 | return rt; |
909 | } | |
1da177e4 | 910 | |
21efcfa0 ED |
911 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
912 | const struct in6_addr *daddr) | |
299d9939 | 913 | { |
21efcfa0 ED |
914 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
915 | ||
887c95cc | 916 | if (rt) |
299d9939 | 917 | rt->rt6i_flags |= RTF_CACHE; |
299d9939 YH |
918 | return rt; |
919 | } | |
920 | ||
8ed67789 | 921 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 922 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
923 | { |
924 | struct fib6_node *fn; | |
519fbd87 | 925 | struct rt6_info *rt, *nrt; |
c71099ac | 926 | int strict = 0; |
1da177e4 | 927 | int attempts = 3; |
519fbd87 | 928 | int err; |
53b7997f | 929 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 930 | |
77d16f45 | 931 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
932 | |
933 | relookup: | |
c71099ac | 934 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 935 | |
8238dd06 | 936 | restart_2: |
4c9483b2 | 937 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
938 | |
939 | restart: | |
4acad72d | 940 | rt = rt6_select(fn, oif, strict | reachable); |
52bd4c0c ND |
941 | if (rt->rt6i_nsiblings) |
942 | rt = rt6_multipath_select(rt, fl6, oif, strict | reachable); | |
4c9483b2 | 943 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 944 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 945 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 946 | goto out; |
1da177e4 | 947 | |
d8d1f30b | 948 | dst_hold(&rt->dst); |
c71099ac | 949 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 950 | |
c440f160 | 951 | if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) |
4c9483b2 | 952 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 953 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 954 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
955 | else |
956 | goto out2; | |
e40cf353 | 957 | |
94e187c0 | 958 | ip6_rt_put(rt); |
8ed67789 | 959 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 960 | |
d8d1f30b | 961 | dst_hold(&rt->dst); |
519fbd87 | 962 | if (nrt) { |
40e22e8f | 963 | err = ip6_ins_rt(nrt); |
519fbd87 | 964 | if (!err) |
1da177e4 | 965 | goto out2; |
1da177e4 | 966 | } |
1da177e4 | 967 | |
519fbd87 YH |
968 | if (--attempts <= 0) |
969 | goto out2; | |
970 | ||
971 | /* | |
c71099ac | 972 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
973 | * released someone could insert this route. Relookup. |
974 | */ | |
94e187c0 | 975 | ip6_rt_put(rt); |
519fbd87 YH |
976 | goto relookup; |
977 | ||
978 | out: | |
8238dd06 YH |
979 | if (reachable) { |
980 | reachable = 0; | |
981 | goto restart_2; | |
982 | } | |
d8d1f30b | 983 | dst_hold(&rt->dst); |
c71099ac | 984 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 985 | out2: |
d8d1f30b CG |
986 | rt->dst.lastuse = jiffies; |
987 | rt->dst.__use++; | |
c71099ac TG |
988 | |
989 | return rt; | |
1da177e4 LT |
990 | } |
991 | ||
8ed67789 | 992 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 993 | struct flowi6 *fl6, int flags) |
4acad72d | 994 | { |
4c9483b2 | 995 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
996 | } |
997 | ||
72331bc0 SL |
998 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
999 | struct net_device *dev, | |
1000 | struct flowi6 *fl6, int flags) | |
1001 | { | |
1002 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
1003 | flags |= RT6_LOOKUP_F_IFACE; | |
1004 | ||
1005 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
1006 | } | |
1007 | ||
c71099ac TG |
1008 | void ip6_route_input(struct sk_buff *skb) |
1009 | { | |
b71d1d42 | 1010 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 1011 | struct net *net = dev_net(skb->dev); |
adaa70bb | 1012 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
1013 | struct flowi6 fl6 = { |
1014 | .flowi6_iif = skb->dev->ifindex, | |
1015 | .daddr = iph->daddr, | |
1016 | .saddr = iph->saddr, | |
6502ca52 | 1017 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
1018 | .flowi6_mark = skb->mark, |
1019 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 1020 | }; |
adaa70bb | 1021 | |
72331bc0 | 1022 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
1023 | } |
1024 | ||
8ed67789 | 1025 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 1026 | struct flowi6 *fl6, int flags) |
1da177e4 | 1027 | { |
4c9483b2 | 1028 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
1029 | } |
1030 | ||
9c7a4f9c | 1031 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 1032 | struct flowi6 *fl6) |
c71099ac TG |
1033 | { |
1034 | int flags = 0; | |
1035 | ||
1fb9489b | 1036 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 1037 | |
4c9483b2 | 1038 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 1039 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 1040 | |
4c9483b2 | 1041 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 1042 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
1043 | else if (sk) |
1044 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 1045 | |
4c9483b2 | 1046 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
1047 | } |
1048 | ||
7159039a | 1049 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 1050 | |
2774c131 | 1051 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 1052 | { |
5c1e6aa3 | 1053 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
1054 | struct dst_entry *new = NULL; |
1055 | ||
f5b0a874 | 1056 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 1057 | if (rt) { |
d8d1f30b | 1058 | new = &rt->dst; |
14e50e57 | 1059 | |
8104891b SK |
1060 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
1061 | rt6_init_peer(rt, net->ipv6.peers); | |
1062 | ||
14e50e57 | 1063 | new->__use = 1; |
352e512c HX |
1064 | new->input = dst_discard; |
1065 | new->output = dst_discard; | |
14e50e57 | 1066 | |
21efcfa0 ED |
1067 | if (dst_metrics_read_only(&ort->dst)) |
1068 | new->_metrics = ort->dst._metrics; | |
1069 | else | |
1070 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1071 | rt->rt6i_idev = ort->rt6i_idev; |
1072 | if (rt->rt6i_idev) | |
1073 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1074 | |
4e3fd7a0 | 1075 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 | 1076 | rt->rt6i_flags = ort->rt6i_flags; |
14e50e57 DM |
1077 | rt->rt6i_metric = 0; |
1078 | ||
1079 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1080 | #ifdef CONFIG_IPV6_SUBTREES | |
1081 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1082 | #endif | |
1083 | ||
1084 | dst_free(new); | |
1085 | } | |
1086 | ||
69ead7af DM |
1087 | dst_release(dst_orig); |
1088 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1089 | } |
14e50e57 | 1090 | |
1da177e4 LT |
1091 | /* |
1092 | * Destination cache support functions | |
1093 | */ | |
1094 | ||
1095 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
1096 | { | |
1097 | struct rt6_info *rt; | |
1098 | ||
1099 | rt = (struct rt6_info *) dst; | |
1100 | ||
6f3118b5 ND |
1101 | /* All IPV6 dsts are created with ->obsolete set to the value |
1102 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1103 | * into this function always. | |
1104 | */ | |
ca4c3fc2 | 1105 | if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev))) |
6f3118b5 ND |
1106 | return NULL; |
1107 | ||
e3bc10bd HFS |
1108 | if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) |
1109 | return NULL; | |
a4477c4d | 1110 | |
e3bc10bd HFS |
1111 | if (rt6_check_expired(rt)) |
1112 | return NULL; | |
1113 | ||
1114 | return dst; | |
1da177e4 LT |
1115 | } |
1116 | ||
1117 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1118 | { | |
1119 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1120 | ||
1121 | if (rt) { | |
54c1a859 YH |
1122 | if (rt->rt6i_flags & RTF_CACHE) { |
1123 | if (rt6_check_expired(rt)) { | |
1124 | ip6_del_rt(rt); | |
1125 | dst = NULL; | |
1126 | } | |
1127 | } else { | |
1da177e4 | 1128 | dst_release(dst); |
54c1a859 YH |
1129 | dst = NULL; |
1130 | } | |
1da177e4 | 1131 | } |
54c1a859 | 1132 | return dst; |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | static void ip6_link_failure(struct sk_buff *skb) | |
1136 | { | |
1137 | struct rt6_info *rt; | |
1138 | ||
3ffe533c | 1139 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1140 | |
adf30907 | 1141 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1142 | if (rt) { |
1eb4f758 HFS |
1143 | if (rt->rt6i_flags & RTF_CACHE) { |
1144 | dst_hold(&rt->dst); | |
1145 | if (ip6_del_rt(rt)) | |
1146 | dst_free(&rt->dst); | |
1147 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { | |
1da177e4 | 1148 | rt->rt6i_node->fn_sernum = -1; |
1eb4f758 | 1149 | } |
1da177e4 LT |
1150 | } |
1151 | } | |
1152 | ||
6700c270 DM |
1153 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1154 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
1155 | { |
1156 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1157 | ||
81aded24 | 1158 | dst_confirm(dst); |
1da177e4 | 1159 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1160 | struct net *net = dev_net(dst->dev); |
1161 | ||
1da177e4 LT |
1162 | rt6->rt6i_flags |= RTF_MODIFIED; |
1163 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1164 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1165 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1166 | features |= RTAX_FEATURE_ALLFRAG; |
1167 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1168 | } |
defb3519 | 1169 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1170 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1171 | } |
1172 | } | |
1173 | ||
42ae66c8 DM |
1174 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1175 | int oif, u32 mark) | |
81aded24 DM |
1176 | { |
1177 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1178 | struct dst_entry *dst; | |
1179 | struct flowi6 fl6; | |
1180 | ||
1181 | memset(&fl6, 0, sizeof(fl6)); | |
1182 | fl6.flowi6_oif = oif; | |
1183 | fl6.flowi6_mark = mark; | |
81aded24 DM |
1184 | fl6.daddr = iph->daddr; |
1185 | fl6.saddr = iph->saddr; | |
6502ca52 | 1186 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1187 | |
1188 | dst = ip6_route_output(net, NULL, &fl6); | |
1189 | if (!dst->error) | |
6700c270 | 1190 | ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); |
81aded24 DM |
1191 | dst_release(dst); |
1192 | } | |
1193 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1194 | ||
1195 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1196 | { | |
1197 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1198 | sk->sk_bound_dev_if, sk->sk_mark); | |
1199 | } | |
1200 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1201 | ||
b55b76b2 DJ |
1202 | /* Handle redirects */ |
1203 | struct ip6rd_flowi { | |
1204 | struct flowi6 fl6; | |
1205 | struct in6_addr gateway; | |
1206 | }; | |
1207 | ||
1208 | static struct rt6_info *__ip6_route_redirect(struct net *net, | |
1209 | struct fib6_table *table, | |
1210 | struct flowi6 *fl6, | |
1211 | int flags) | |
1212 | { | |
1213 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; | |
1214 | struct rt6_info *rt; | |
1215 | struct fib6_node *fn; | |
1216 | ||
1217 | /* Get the "current" route for this destination and | |
1218 | * check if the redirect has come from approriate router. | |
1219 | * | |
1220 | * RFC 4861 specifies that redirects should only be | |
1221 | * accepted if they come from the nexthop to the target. | |
1222 | * Due to the way the routes are chosen, this notion | |
1223 | * is a bit fuzzy and one might need to check all possible | |
1224 | * routes. | |
1225 | */ | |
1226 | ||
1227 | read_lock_bh(&table->tb6_lock); | |
1228 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); | |
1229 | restart: | |
1230 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { | |
1231 | if (rt6_check_expired(rt)) | |
1232 | continue; | |
1233 | if (rt->dst.error) | |
1234 | break; | |
1235 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1236 | continue; | |
1237 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) | |
1238 | continue; | |
1239 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) | |
1240 | continue; | |
1241 | break; | |
1242 | } | |
1243 | ||
1244 | if (!rt) | |
1245 | rt = net->ipv6.ip6_null_entry; | |
1246 | else if (rt->dst.error) { | |
1247 | rt = net->ipv6.ip6_null_entry; | |
1248 | goto out; | |
1249 | } | |
1250 | BACKTRACK(net, &fl6->saddr); | |
1251 | out: | |
1252 | dst_hold(&rt->dst); | |
1253 | ||
1254 | read_unlock_bh(&table->tb6_lock); | |
1255 | ||
1256 | return rt; | |
1257 | }; | |
1258 | ||
1259 | static struct dst_entry *ip6_route_redirect(struct net *net, | |
1260 | const struct flowi6 *fl6, | |
1261 | const struct in6_addr *gateway) | |
1262 | { | |
1263 | int flags = RT6_LOOKUP_F_HAS_SADDR; | |
1264 | struct ip6rd_flowi rdfl; | |
1265 | ||
1266 | rdfl.fl6 = *fl6; | |
1267 | rdfl.gateway = *gateway; | |
1268 | ||
1269 | return fib6_rule_lookup(net, &rdfl.fl6, | |
1270 | flags, __ip6_route_redirect); | |
1271 | } | |
1272 | ||
3a5ad2ee DM |
1273 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1274 | { | |
1275 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1276 | struct dst_entry *dst; | |
1277 | struct flowi6 fl6; | |
1278 | ||
1279 | memset(&fl6, 0, sizeof(fl6)); | |
1280 | fl6.flowi6_oif = oif; | |
1281 | fl6.flowi6_mark = mark; | |
3a5ad2ee DM |
1282 | fl6.daddr = iph->daddr; |
1283 | fl6.saddr = iph->saddr; | |
6502ca52 | 1284 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee | 1285 | |
b55b76b2 DJ |
1286 | dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); |
1287 | rt6_do_redirect(dst, NULL, skb); | |
3a5ad2ee DM |
1288 | dst_release(dst); |
1289 | } | |
1290 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1291 | ||
c92a59ec DJ |
1292 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
1293 | u32 mark) | |
1294 | { | |
1295 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
1296 | const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); | |
1297 | struct dst_entry *dst; | |
1298 | struct flowi6 fl6; | |
1299 | ||
1300 | memset(&fl6, 0, sizeof(fl6)); | |
1301 | fl6.flowi6_oif = oif; | |
1302 | fl6.flowi6_mark = mark; | |
c92a59ec DJ |
1303 | fl6.daddr = msg->dest; |
1304 | fl6.saddr = iph->daddr; | |
1305 | ||
b55b76b2 DJ |
1306 | dst = ip6_route_redirect(net, &fl6, &iph->saddr); |
1307 | rt6_do_redirect(dst, NULL, skb); | |
c92a59ec DJ |
1308 | dst_release(dst); |
1309 | } | |
1310 | ||
3a5ad2ee DM |
1311 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) |
1312 | { | |
1313 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1314 | } | |
1315 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1316 | ||
0dbaee3b | 1317 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1318 | { |
0dbaee3b DM |
1319 | struct net_device *dev = dst->dev; |
1320 | unsigned int mtu = dst_mtu(dst); | |
1321 | struct net *net = dev_net(dev); | |
1322 | ||
1da177e4 LT |
1323 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1324 | ||
5578689a DL |
1325 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1326 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1327 | |
1328 | /* | |
1ab1457c YH |
1329 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1330 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1331 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1332 | * rely only on pmtu discovery" |
1333 | */ | |
1334 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1335 | mtu = IPV6_MAXPLEN; | |
1336 | return mtu; | |
1337 | } | |
1338 | ||
ebb762f2 | 1339 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1340 | { |
d33e4553 | 1341 | struct inet6_dev *idev; |
618f9bc7 SK |
1342 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1343 | ||
1344 | if (mtu) | |
1345 | return mtu; | |
1346 | ||
1347 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1348 | |
1349 | rcu_read_lock(); | |
1350 | idev = __in6_dev_get(dst->dev); | |
1351 | if (idev) | |
1352 | mtu = idev->cnf.mtu6; | |
1353 | rcu_read_unlock(); | |
1354 | ||
1355 | return mtu; | |
1356 | } | |
1357 | ||
3b00944c YH |
1358 | static struct dst_entry *icmp6_dst_gc_list; |
1359 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1360 | |
3b00944c | 1361 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1362 | struct flowi6 *fl6) |
1da177e4 | 1363 | { |
87a11578 | 1364 | struct dst_entry *dst; |
1da177e4 LT |
1365 | struct rt6_info *rt; |
1366 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1367 | struct net *net = dev_net(dev); |
1da177e4 | 1368 | |
38308473 | 1369 | if (unlikely(!idev)) |
122bdf67 | 1370 | return ERR_PTR(-ENODEV); |
1da177e4 | 1371 | |
8b96d22d | 1372 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1373 | if (unlikely(!rt)) { |
1da177e4 | 1374 | in6_dev_put(idev); |
87a11578 | 1375 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1376 | goto out; |
1377 | } | |
1378 | ||
8e2ec639 YZ |
1379 | rt->dst.flags |= DST_HOST; |
1380 | rt->dst.output = ip6_output; | |
d8d1f30b | 1381 | atomic_set(&rt->dst.__refcnt, 1); |
550bab42 | 1382 | rt->rt6i_gateway = fl6->daddr; |
87a11578 | 1383 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1384 | rt->rt6i_dst.plen = 128; |
1385 | rt->rt6i_idev = idev; | |
14edd87d | 1386 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1387 | |
3b00944c | 1388 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1389 | rt->dst.next = icmp6_dst_gc_list; |
1390 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1391 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1392 | |
5578689a | 1393 | fib6_force_start_gc(net); |
1da177e4 | 1394 | |
87a11578 DM |
1395 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1396 | ||
1da177e4 | 1397 | out: |
87a11578 | 1398 | return dst; |
1da177e4 LT |
1399 | } |
1400 | ||
3d0f24a7 | 1401 | int icmp6_dst_gc(void) |
1da177e4 | 1402 | { |
e9476e95 | 1403 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1404 | int more = 0; |
1da177e4 | 1405 | |
3b00944c YH |
1406 | spin_lock_bh(&icmp6_dst_lock); |
1407 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1408 | |
1da177e4 LT |
1409 | while ((dst = *pprev) != NULL) { |
1410 | if (!atomic_read(&dst->__refcnt)) { | |
1411 | *pprev = dst->next; | |
1412 | dst_free(dst); | |
1da177e4 LT |
1413 | } else { |
1414 | pprev = &dst->next; | |
3d0f24a7 | 1415 | ++more; |
1da177e4 LT |
1416 | } |
1417 | } | |
1418 | ||
3b00944c | 1419 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1420 | |
3d0f24a7 | 1421 | return more; |
1da177e4 LT |
1422 | } |
1423 | ||
1e493d19 DM |
1424 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1425 | void *arg) | |
1426 | { | |
1427 | struct dst_entry *dst, **pprev; | |
1428 | ||
1429 | spin_lock_bh(&icmp6_dst_lock); | |
1430 | pprev = &icmp6_dst_gc_list; | |
1431 | while ((dst = *pprev) != NULL) { | |
1432 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1433 | if (func(rt, arg)) { | |
1434 | *pprev = dst->next; | |
1435 | dst_free(dst); | |
1436 | } else { | |
1437 | pprev = &dst->next; | |
1438 | } | |
1439 | } | |
1440 | spin_unlock_bh(&icmp6_dst_lock); | |
1441 | } | |
1442 | ||
569d3645 | 1443 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1444 | { |
86393e52 | 1445 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1446 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1447 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1448 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1449 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1450 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1451 | int entries; |
7019b78e | 1452 | |
fc66f95c | 1453 | entries = dst_entries_get_fast(ops); |
49a18d86 | 1454 | if (time_after(rt_last_gc + rt_min_interval, jiffies) && |
fc66f95c | 1455 | entries <= rt_max_size) |
1da177e4 LT |
1456 | goto out; |
1457 | ||
6891a346 | 1458 | net->ipv6.ip6_rt_gc_expire++; |
2ac3ac8f | 1459 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size); |
fc66f95c ED |
1460 | entries = dst_entries_get_slow(ops); |
1461 | if (entries < ops->gc_thresh) | |
7019b78e | 1462 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1463 | out: |
7019b78e | 1464 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1465 | return entries > rt_max_size; |
1da177e4 LT |
1466 | } |
1467 | ||
1da177e4 LT |
1468 | /* |
1469 | * | |
1470 | */ | |
1471 | ||
86872cb5 | 1472 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1473 | { |
1474 | int err; | |
5578689a | 1475 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1476 | struct rt6_info *rt = NULL; |
1477 | struct net_device *dev = NULL; | |
1478 | struct inet6_dev *idev = NULL; | |
c71099ac | 1479 | struct fib6_table *table; |
1da177e4 LT |
1480 | int addr_type; |
1481 | ||
86872cb5 | 1482 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1483 | return -EINVAL; |
1484 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1485 | if (cfg->fc_src_len) |
1da177e4 LT |
1486 | return -EINVAL; |
1487 | #endif | |
86872cb5 | 1488 | if (cfg->fc_ifindex) { |
1da177e4 | 1489 | err = -ENODEV; |
5578689a | 1490 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1491 | if (!dev) |
1492 | goto out; | |
1493 | idev = in6_dev_get(dev); | |
1494 | if (!idev) | |
1495 | goto out; | |
1496 | } | |
1497 | ||
86872cb5 TG |
1498 | if (cfg->fc_metric == 0) |
1499 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1500 | |
d71314b4 | 1501 | err = -ENOBUFS; |
38308473 DM |
1502 | if (cfg->fc_nlinfo.nlh && |
1503 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1504 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1505 | if (!table) { |
f3213831 | 1506 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1507 | table = fib6_new_table(net, cfg->fc_table); |
1508 | } | |
1509 | } else { | |
1510 | table = fib6_new_table(net, cfg->fc_table); | |
1511 | } | |
38308473 DM |
1512 | |
1513 | if (!table) | |
c71099ac | 1514 | goto out; |
c71099ac | 1515 | |
c88507fb | 1516 | rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table); |
1da177e4 | 1517 | |
38308473 | 1518 | if (!rt) { |
1da177e4 LT |
1519 | err = -ENOMEM; |
1520 | goto out; | |
1521 | } | |
1522 | ||
1716a961 G |
1523 | if (cfg->fc_flags & RTF_EXPIRES) |
1524 | rt6_set_expires(rt, jiffies + | |
1525 | clock_t_to_jiffies(cfg->fc_expires)); | |
1526 | else | |
1527 | rt6_clean_expires(rt); | |
1da177e4 | 1528 | |
86872cb5 TG |
1529 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1530 | cfg->fc_protocol = RTPROT_BOOT; | |
1531 | rt->rt6i_protocol = cfg->fc_protocol; | |
1532 | ||
1533 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1534 | |
1535 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1536 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1537 | else if (cfg->fc_flags & RTF_LOCAL) |
1538 | rt->dst.input = ip6_input; | |
1da177e4 | 1539 | else |
d8d1f30b | 1540 | rt->dst.input = ip6_forward; |
1da177e4 | 1541 | |
d8d1f30b | 1542 | rt->dst.output = ip6_output; |
1da177e4 | 1543 | |
86872cb5 TG |
1544 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1545 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1546 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1547 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1548 | |
8e2ec639 YZ |
1549 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1550 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1551 | if (!metrics) { | |
1552 | err = -ENOMEM; | |
1553 | goto out; | |
1554 | } | |
1555 | dst_init_metrics(&rt->dst, metrics, 0); | |
1556 | } | |
1da177e4 | 1557 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1558 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1559 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1560 | #endif |
1561 | ||
86872cb5 | 1562 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1563 | |
1564 | /* We cannot add true routes via loopback here, | |
1565 | they would result in kernel looping; promote them to reject routes | |
1566 | */ | |
86872cb5 | 1567 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1568 | (dev && (dev->flags & IFF_LOOPBACK) && |
1569 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1570 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1571 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1572 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1573 | if (dev) { |
1574 | dev_put(dev); | |
1575 | in6_dev_put(idev); | |
1576 | } | |
5578689a | 1577 | dev = net->loopback_dev; |
1da177e4 LT |
1578 | dev_hold(dev); |
1579 | idev = in6_dev_get(dev); | |
1580 | if (!idev) { | |
1581 | err = -ENODEV; | |
1582 | goto out; | |
1583 | } | |
1584 | } | |
1da177e4 | 1585 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1586 | switch (cfg->fc_type) { |
1587 | case RTN_BLACKHOLE: | |
1588 | rt->dst.error = -EINVAL; | |
7150aede K |
1589 | rt->dst.output = dst_discard; |
1590 | rt->dst.input = dst_discard; | |
ef2c7d7b ND |
1591 | break; |
1592 | case RTN_PROHIBIT: | |
1593 | rt->dst.error = -EACCES; | |
7150aede K |
1594 | rt->dst.output = ip6_pkt_prohibit_out; |
1595 | rt->dst.input = ip6_pkt_prohibit; | |
ef2c7d7b | 1596 | break; |
b4949ab2 | 1597 | case RTN_THROW: |
ef2c7d7b | 1598 | default: |
7150aede K |
1599 | rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN |
1600 | : -ENETUNREACH; | |
1601 | rt->dst.output = ip6_pkt_discard_out; | |
1602 | rt->dst.input = ip6_pkt_discard; | |
ef2c7d7b ND |
1603 | break; |
1604 | } | |
1da177e4 LT |
1605 | goto install_route; |
1606 | } | |
1607 | ||
86872cb5 | 1608 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1609 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1610 | int gwa_type; |
1611 | ||
86872cb5 | 1612 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1613 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1614 | gwa_type = ipv6_addr_type(gw_addr); |
1615 | ||
1616 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1617 | struct rt6_info *grt; | |
1618 | ||
1619 | /* IPv6 strictly inhibits using not link-local | |
1620 | addresses as nexthop address. | |
1621 | Otherwise, router will not able to send redirects. | |
1622 | It is very good, but in some (rare!) circumstances | |
1623 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1624 | some exceptions. --ANK | |
1625 | */ | |
1626 | err = -EINVAL; | |
38308473 | 1627 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1628 | goto out; |
1629 | ||
5578689a | 1630 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1631 | |
1632 | err = -EHOSTUNREACH; | |
38308473 | 1633 | if (!grt) |
1da177e4 LT |
1634 | goto out; |
1635 | if (dev) { | |
d1918542 | 1636 | if (dev != grt->dst.dev) { |
94e187c0 | 1637 | ip6_rt_put(grt); |
1da177e4 LT |
1638 | goto out; |
1639 | } | |
1640 | } else { | |
d1918542 | 1641 | dev = grt->dst.dev; |
1da177e4 LT |
1642 | idev = grt->rt6i_idev; |
1643 | dev_hold(dev); | |
1644 | in6_dev_hold(grt->rt6i_idev); | |
1645 | } | |
38308473 | 1646 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1647 | err = 0; |
94e187c0 | 1648 | ip6_rt_put(grt); |
1da177e4 LT |
1649 | |
1650 | if (err) | |
1651 | goto out; | |
1652 | } | |
1653 | err = -EINVAL; | |
38308473 | 1654 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1655 | goto out; |
1656 | } | |
1657 | ||
1658 | err = -ENODEV; | |
38308473 | 1659 | if (!dev) |
1da177e4 LT |
1660 | goto out; |
1661 | ||
c3968a85 DW |
1662 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1663 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1664 | err = -EINVAL; | |
1665 | goto out; | |
1666 | } | |
4e3fd7a0 | 1667 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1668 | rt->rt6i_prefsrc.plen = 128; |
1669 | } else | |
1670 | rt->rt6i_prefsrc.plen = 0; | |
1671 | ||
86872cb5 | 1672 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1673 | |
1674 | install_route: | |
86872cb5 TG |
1675 | if (cfg->fc_mx) { |
1676 | struct nlattr *nla; | |
1677 | int remaining; | |
1678 | ||
1679 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1680 | int type = nla_type(nla); |
86872cb5 TG |
1681 | |
1682 | if (type) { | |
1683 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1684 | err = -EINVAL; |
1685 | goto out; | |
1686 | } | |
86872cb5 | 1687 | |
defb3519 | 1688 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1689 | } |
1da177e4 LT |
1690 | } |
1691 | } | |
1692 | ||
d8d1f30b | 1693 | rt->dst.dev = dev; |
1da177e4 | 1694 | rt->rt6i_idev = idev; |
c71099ac | 1695 | rt->rt6i_table = table; |
63152fc0 | 1696 | |
c346dca1 | 1697 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1698 | |
86872cb5 | 1699 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1700 | |
1701 | out: | |
1702 | if (dev) | |
1703 | dev_put(dev); | |
1704 | if (idev) | |
1705 | in6_dev_put(idev); | |
1706 | if (rt) | |
d8d1f30b | 1707 | dst_free(&rt->dst); |
1da177e4 LT |
1708 | return err; |
1709 | } | |
1710 | ||
86872cb5 | 1711 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1712 | { |
1713 | int err; | |
c71099ac | 1714 | struct fib6_table *table; |
d1918542 | 1715 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1716 | |
6825a26c G |
1717 | if (rt == net->ipv6.ip6_null_entry) { |
1718 | err = -ENOENT; | |
1719 | goto out; | |
1720 | } | |
6c813a72 | 1721 | |
c71099ac TG |
1722 | table = rt->rt6i_table; |
1723 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 1724 | err = fib6_del(rt, info); |
c71099ac | 1725 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 1726 | |
6825a26c | 1727 | out: |
94e187c0 | 1728 | ip6_rt_put(rt); |
1da177e4 LT |
1729 | return err; |
1730 | } | |
1731 | ||
e0a1ad73 TG |
1732 | int ip6_del_rt(struct rt6_info *rt) |
1733 | { | |
4d1169c1 | 1734 | struct nl_info info = { |
d1918542 | 1735 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1736 | }; |
528c4ceb | 1737 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1738 | } |
1739 | ||
86872cb5 | 1740 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1741 | { |
c71099ac | 1742 | struct fib6_table *table; |
1da177e4 LT |
1743 | struct fib6_node *fn; |
1744 | struct rt6_info *rt; | |
1745 | int err = -ESRCH; | |
1746 | ||
5578689a | 1747 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1748 | if (!table) |
c71099ac TG |
1749 | return err; |
1750 | ||
1751 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1752 | |
c71099ac | 1753 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1754 | &cfg->fc_dst, cfg->fc_dst_len, |
1755 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1756 | |
1da177e4 | 1757 | if (fn) { |
d8d1f30b | 1758 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1759 | if (cfg->fc_ifindex && |
d1918542 DM |
1760 | (!rt->dst.dev || |
1761 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1762 | continue; |
86872cb5 TG |
1763 | if (cfg->fc_flags & RTF_GATEWAY && |
1764 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1765 | continue; |
86872cb5 | 1766 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1767 | continue; |
d8d1f30b | 1768 | dst_hold(&rt->dst); |
c71099ac | 1769 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1770 | |
86872cb5 | 1771 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1772 | } |
1773 | } | |
c71099ac | 1774 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1775 | |
1776 | return err; | |
1777 | } | |
1778 | ||
6700c270 | 1779 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 1780 | { |
e8599ff4 | 1781 | struct net *net = dev_net(skb->dev); |
a6279458 | 1782 | struct netevent_redirect netevent; |
e8599ff4 | 1783 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
1784 | struct ndisc_options ndopts; |
1785 | struct inet6_dev *in6_dev; | |
1786 | struct neighbour *neigh; | |
71bcdba0 | 1787 | struct rd_msg *msg; |
6e157b6a DM |
1788 | int optlen, on_link; |
1789 | u8 *lladdr; | |
e8599ff4 | 1790 | |
29a3cad5 | 1791 | optlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
71bcdba0 | 1792 | optlen -= sizeof(*msg); |
e8599ff4 DM |
1793 | |
1794 | if (optlen < 0) { | |
6e157b6a | 1795 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
1796 | return; |
1797 | } | |
1798 | ||
71bcdba0 | 1799 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 1800 | |
71bcdba0 | 1801 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 1802 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
1803 | return; |
1804 | } | |
1805 | ||
6e157b6a | 1806 | on_link = 0; |
71bcdba0 | 1807 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 1808 | on_link = 1; |
71bcdba0 | 1809 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 1810 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 1811 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
1812 | return; |
1813 | } | |
1814 | ||
1815 | in6_dev = __in6_dev_get(skb->dev); | |
1816 | if (!in6_dev) | |
1817 | return; | |
1818 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
1819 | return; | |
1820 | ||
1821 | /* RFC2461 8.1: | |
1822 | * The IP source address of the Redirect MUST be the same as the current | |
1823 | * first-hop router for the specified ICMP Destination Address. | |
1824 | */ | |
1825 | ||
71bcdba0 | 1826 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
1827 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
1828 | return; | |
1829 | } | |
6e157b6a DM |
1830 | |
1831 | lladdr = NULL; | |
e8599ff4 DM |
1832 | if (ndopts.nd_opts_tgt_lladdr) { |
1833 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1834 | skb->dev); | |
1835 | if (!lladdr) { | |
1836 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
1837 | return; | |
1838 | } | |
1839 | } | |
1840 | ||
6e157b6a DM |
1841 | rt = (struct rt6_info *) dst; |
1842 | if (rt == net->ipv6.ip6_null_entry) { | |
1843 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 1844 | return; |
6e157b6a | 1845 | } |
e8599ff4 | 1846 | |
6e157b6a DM |
1847 | /* Redirect received -> path was valid. |
1848 | * Look, redirects are sent only in response to data packets, | |
1849 | * so that this nexthop apparently is reachable. --ANK | |
1850 | */ | |
1851 | dst_confirm(&rt->dst); | |
a6279458 | 1852 | |
71bcdba0 | 1853 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
1854 | if (!neigh) |
1855 | return; | |
a6279458 | 1856 | |
1da177e4 LT |
1857 | /* |
1858 | * We have finally decided to accept it. | |
1859 | */ | |
1860 | ||
1ab1457c | 1861 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1862 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1863 | NEIGH_UPDATE_F_OVERRIDE| | |
1864 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1865 | NEIGH_UPDATE_F_ISROUTER)) | |
1866 | ); | |
1867 | ||
71bcdba0 | 1868 | nrt = ip6_rt_copy(rt, &msg->dest); |
38308473 | 1869 | if (!nrt) |
1da177e4 LT |
1870 | goto out; |
1871 | ||
1872 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1873 | if (on_link) | |
1874 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1875 | ||
4e3fd7a0 | 1876 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 1877 | |
40e22e8f | 1878 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1879 | goto out; |
1880 | ||
d8d1f30b CG |
1881 | netevent.old = &rt->dst; |
1882 | netevent.new = &nrt->dst; | |
71bcdba0 | 1883 | netevent.daddr = &msg->dest; |
60592833 | 1884 | netevent.neigh = neigh; |
8d71740c TT |
1885 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1886 | ||
38308473 | 1887 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 1888 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 1889 | ip6_del_rt(rt); |
1da177e4 LT |
1890 | } |
1891 | ||
1892 | out: | |
e8599ff4 | 1893 | neigh_release(neigh); |
6e157b6a DM |
1894 | } |
1895 | ||
1da177e4 LT |
1896 | /* |
1897 | * Misc support functions | |
1898 | */ | |
1899 | ||
1716a961 | 1900 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1901 | const struct in6_addr *dest) |
1da177e4 | 1902 | { |
d1918542 | 1903 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1904 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1905 | ort->rt6i_table); | |
1da177e4 LT |
1906 | |
1907 | if (rt) { | |
d8d1f30b CG |
1908 | rt->dst.input = ort->dst.input; |
1909 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1910 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1911 | |
4e3fd7a0 | 1912 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1913 | rt->rt6i_dst.plen = 128; |
defb3519 | 1914 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1915 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1916 | rt->rt6i_idev = ort->rt6i_idev; |
1917 | if (rt->rt6i_idev) | |
1918 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1919 | rt->dst.lastuse = jiffies; |
1da177e4 | 1920 | |
550bab42 JA |
1921 | if (ort->rt6i_flags & RTF_GATEWAY) |
1922 | rt->rt6i_gateway = ort->rt6i_gateway; | |
1923 | else | |
1924 | rt->rt6i_gateway = *dest; | |
1716a961 | 1925 | rt->rt6i_flags = ort->rt6i_flags; |
24f5b855 | 1926 | rt6_set_from(rt, ort); |
1da177e4 LT |
1927 | rt->rt6i_metric = 0; |
1928 | ||
1da177e4 LT |
1929 | #ifdef CONFIG_IPV6_SUBTREES |
1930 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1931 | #endif | |
0f6c6392 | 1932 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1933 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1934 | } |
1935 | return rt; | |
1936 | } | |
1937 | ||
70ceb4f5 | 1938 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1939 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1940 | const struct in6_addr *prefix, int prefixlen, |
1941 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1942 | { |
1943 | struct fib6_node *fn; | |
1944 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1945 | struct fib6_table *table; |
1946 | ||
efa2cea0 | 1947 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1948 | if (!table) |
c71099ac | 1949 | return NULL; |
70ceb4f5 | 1950 | |
5744dd9b | 1951 | read_lock_bh(&table->tb6_lock); |
c71099ac | 1952 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); |
70ceb4f5 YH |
1953 | if (!fn) |
1954 | goto out; | |
1955 | ||
d8d1f30b | 1956 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1957 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1958 | continue; |
1959 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1960 | continue; | |
1961 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1962 | continue; | |
d8d1f30b | 1963 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1964 | break; |
1965 | } | |
1966 | out: | |
5744dd9b | 1967 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1968 | return rt; |
1969 | } | |
1970 | ||
efa2cea0 | 1971 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1972 | const struct in6_addr *prefix, int prefixlen, |
1973 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1974 | unsigned int pref) |
70ceb4f5 | 1975 | { |
86872cb5 TG |
1976 | struct fib6_config cfg = { |
1977 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1978 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1979 | .fc_ifindex = ifindex, |
1980 | .fc_dst_len = prefixlen, | |
1981 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1982 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 1983 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
1984 | .fc_nlinfo.nlh = NULL, |
1985 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1986 | }; |
1987 | ||
4e3fd7a0 AD |
1988 | cfg.fc_dst = *prefix; |
1989 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1990 | |
e317da96 YH |
1991 | /* We should treat it as a default route if prefix length is 0. */ |
1992 | if (!prefixlen) | |
86872cb5 | 1993 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1994 | |
86872cb5 | 1995 | ip6_route_add(&cfg); |
70ceb4f5 | 1996 | |
efa2cea0 | 1997 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1998 | } |
1999 | #endif | |
2000 | ||
b71d1d42 | 2001 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 2002 | { |
1da177e4 | 2003 | struct rt6_info *rt; |
c71099ac | 2004 | struct fib6_table *table; |
1da177e4 | 2005 | |
c346dca1 | 2006 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 2007 | if (!table) |
c71099ac | 2008 | return NULL; |
1da177e4 | 2009 | |
5744dd9b | 2010 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2011 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 2012 | if (dev == rt->dst.dev && |
045927ff | 2013 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
2014 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
2015 | break; | |
2016 | } | |
2017 | if (rt) | |
d8d1f30b | 2018 | dst_hold(&rt->dst); |
5744dd9b | 2019 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2020 | return rt; |
2021 | } | |
2022 | ||
b71d1d42 | 2023 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
2024 | struct net_device *dev, |
2025 | unsigned int pref) | |
1da177e4 | 2026 | { |
86872cb5 TG |
2027 | struct fib6_config cfg = { |
2028 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 2029 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
2030 | .fc_ifindex = dev->ifindex, |
2031 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
2032 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 2033 | .fc_nlinfo.portid = 0, |
5578689a | 2034 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 2035 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 2036 | }; |
1da177e4 | 2037 | |
4e3fd7a0 | 2038 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 2039 | |
86872cb5 | 2040 | ip6_route_add(&cfg); |
1da177e4 | 2041 | |
1da177e4 LT |
2042 | return rt6_get_dflt_router(gwaddr, dev); |
2043 | } | |
2044 | ||
7b4da532 | 2045 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
2046 | { |
2047 | struct rt6_info *rt; | |
c71099ac TG |
2048 | struct fib6_table *table; |
2049 | ||
2050 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 2051 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 2052 | if (!table) |
c71099ac | 2053 | return; |
1da177e4 LT |
2054 | |
2055 | restart: | |
c71099ac | 2056 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 2057 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
3e8b0ac3 LC |
2058 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && |
2059 | (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { | |
d8d1f30b | 2060 | dst_hold(&rt->dst); |
c71099ac | 2061 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 2062 | ip6_del_rt(rt); |
1da177e4 LT |
2063 | goto restart; |
2064 | } | |
2065 | } | |
c71099ac | 2066 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
2067 | } |
2068 | ||
5578689a DL |
2069 | static void rtmsg_to_fib6_config(struct net *net, |
2070 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
2071 | struct fib6_config *cfg) |
2072 | { | |
2073 | memset(cfg, 0, sizeof(*cfg)); | |
2074 | ||
2075 | cfg->fc_table = RT6_TABLE_MAIN; | |
2076 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
2077 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
2078 | cfg->fc_expires = rtmsg->rtmsg_info; | |
2079 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
2080 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
2081 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
2082 | ||
5578689a | 2083 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 2084 | |
4e3fd7a0 AD |
2085 | cfg->fc_dst = rtmsg->rtmsg_dst; |
2086 | cfg->fc_src = rtmsg->rtmsg_src; | |
2087 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2088 | } |
2089 | ||
5578689a | 2090 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2091 | { |
86872cb5 | 2092 | struct fib6_config cfg; |
1da177e4 LT |
2093 | struct in6_rtmsg rtmsg; |
2094 | int err; | |
2095 | ||
2096 | switch(cmd) { | |
2097 | case SIOCADDRT: /* Add a route */ | |
2098 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 2099 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
2100 | return -EPERM; |
2101 | err = copy_from_user(&rtmsg, arg, | |
2102 | sizeof(struct in6_rtmsg)); | |
2103 | if (err) | |
2104 | return -EFAULT; | |
86872cb5 | 2105 | |
5578689a | 2106 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2107 | |
1da177e4 LT |
2108 | rtnl_lock(); |
2109 | switch (cmd) { | |
2110 | case SIOCADDRT: | |
86872cb5 | 2111 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2112 | break; |
2113 | case SIOCDELRT: | |
86872cb5 | 2114 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2115 | break; |
2116 | default: | |
2117 | err = -EINVAL; | |
2118 | } | |
2119 | rtnl_unlock(); | |
2120 | ||
2121 | return err; | |
3ff50b79 | 2122 | } |
1da177e4 LT |
2123 | |
2124 | return -EINVAL; | |
2125 | } | |
2126 | ||
2127 | /* | |
2128 | * Drop the packet on the floor | |
2129 | */ | |
2130 | ||
d5fdd6ba | 2131 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2132 | { |
612f09e8 | 2133 | int type; |
adf30907 | 2134 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2135 | switch (ipstats_mib_noroutes) { |
2136 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2137 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2138 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2139 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2140 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2141 | break; |
2142 | } | |
2143 | /* FALLTHROUGH */ | |
2144 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2145 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2146 | ipstats_mib_noroutes); | |
612f09e8 YH |
2147 | break; |
2148 | } | |
3ffe533c | 2149 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2150 | kfree_skb(skb); |
2151 | return 0; | |
2152 | } | |
2153 | ||
9ce8ade0 TG |
2154 | static int ip6_pkt_discard(struct sk_buff *skb) |
2155 | { | |
612f09e8 | 2156 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2157 | } |
2158 | ||
20380731 | 2159 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2160 | { |
adf30907 | 2161 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2162 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2163 | } |
2164 | ||
9ce8ade0 TG |
2165 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2166 | { | |
612f09e8 | 2167 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2168 | } |
2169 | ||
2170 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2171 | { | |
adf30907 | 2172 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2173 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2174 | } |
2175 | ||
1da177e4 LT |
2176 | /* |
2177 | * Allocate a dst for local (unicast / anycast) address. | |
2178 | */ | |
2179 | ||
2180 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2181 | const struct in6_addr *addr, | |
8f031519 | 2182 | bool anycast) |
1da177e4 | 2183 | { |
c346dca1 | 2184 | struct net *net = dev_net(idev->dev); |
a3300ef4 HFS |
2185 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, |
2186 | DST_NOCOUNT, NULL); | |
2187 | if (!rt) | |
1da177e4 LT |
2188 | return ERR_PTR(-ENOMEM); |
2189 | ||
1da177e4 LT |
2190 | in6_dev_hold(idev); |
2191 | ||
11d53b49 | 2192 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2193 | rt->dst.input = ip6_input; |
2194 | rt->dst.output = ip6_output; | |
1da177e4 | 2195 | rt->rt6i_idev = idev; |
1da177e4 LT |
2196 | |
2197 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2198 | if (anycast) |
2199 | rt->rt6i_flags |= RTF_ANYCAST; | |
2200 | else | |
1da177e4 | 2201 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2202 | |
550bab42 | 2203 | rt->rt6i_gateway = *addr; |
4e3fd7a0 | 2204 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2205 | rt->rt6i_dst.plen = 128; |
5578689a | 2206 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2207 | |
d8d1f30b | 2208 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2209 | |
2210 | return rt; | |
2211 | } | |
2212 | ||
c3968a85 DW |
2213 | int ip6_route_get_saddr(struct net *net, |
2214 | struct rt6_info *rt, | |
b71d1d42 | 2215 | const struct in6_addr *daddr, |
c3968a85 DW |
2216 | unsigned int prefs, |
2217 | struct in6_addr *saddr) | |
2218 | { | |
2219 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2220 | int err = 0; | |
2221 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2222 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2223 | else |
2224 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2225 | daddr, prefs, saddr); | |
2226 | return err; | |
2227 | } | |
2228 | ||
2229 | /* remove deleted ip from prefsrc entries */ | |
2230 | struct arg_dev_net_ip { | |
2231 | struct net_device *dev; | |
2232 | struct net *net; | |
2233 | struct in6_addr *addr; | |
2234 | }; | |
2235 | ||
2236 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2237 | { | |
2238 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2239 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2240 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2241 | ||
d1918542 | 2242 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2243 | rt != net->ipv6.ip6_null_entry && |
2244 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2245 | /* remove prefsrc entry */ | |
2246 | rt->rt6i_prefsrc.plen = 0; | |
2247 | } | |
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2252 | { | |
2253 | struct net *net = dev_net(ifp->idev->dev); | |
2254 | struct arg_dev_net_ip adni = { | |
2255 | .dev = ifp->idev->dev, | |
2256 | .net = net, | |
2257 | .addr = &ifp->addr, | |
2258 | }; | |
0c3584d5 | 2259 | fib6_clean_all(net, fib6_remove_prefsrc, &adni); |
c3968a85 DW |
2260 | } |
2261 | ||
8ed67789 DL |
2262 | struct arg_dev_net { |
2263 | struct net_device *dev; | |
2264 | struct net *net; | |
2265 | }; | |
2266 | ||
1da177e4 LT |
2267 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2268 | { | |
bc3ef660 | 2269 | const struct arg_dev_net *adn = arg; |
2270 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2271 | |
d1918542 | 2272 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2273 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2274 | return -1; |
c159d30c | 2275 | |
1da177e4 LT |
2276 | return 0; |
2277 | } | |
2278 | ||
f3db4851 | 2279 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2280 | { |
8ed67789 DL |
2281 | struct arg_dev_net adn = { |
2282 | .dev = dev, | |
2283 | .net = net, | |
2284 | }; | |
2285 | ||
0c3584d5 | 2286 | fib6_clean_all(net, fib6_ifdown, &adn); |
1e493d19 | 2287 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2288 | } |
2289 | ||
95c96174 | 2290 | struct rt6_mtu_change_arg { |
1da177e4 | 2291 | struct net_device *dev; |
95c96174 | 2292 | unsigned int mtu; |
1da177e4 LT |
2293 | }; |
2294 | ||
2295 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2296 | { | |
2297 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2298 | struct inet6_dev *idev; | |
2299 | ||
2300 | /* In IPv6 pmtu discovery is not optional, | |
2301 | so that RTAX_MTU lock cannot disable it. | |
2302 | We still use this lock to block changes | |
2303 | caused by addrconf/ndisc. | |
2304 | */ | |
2305 | ||
2306 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2307 | if (!idev) |
1da177e4 LT |
2308 | return 0; |
2309 | ||
2310 | /* For administrative MTU increase, there is no way to discover | |
2311 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2312 | Since RFC 1981 doesn't include administrative MTU increase | |
2313 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2314 | */ | |
2315 | /* | |
2316 | If new MTU is less than route PMTU, this new MTU will be the | |
2317 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2318 | decreases; if new MTU is greater than route PMTU, and the | |
2319 | old MTU is the lowest MTU in the path, update the route PMTU | |
2320 | to reflect the increase. In this case if the other nodes' MTU | |
2321 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2322 | PMTU discouvery. | |
2323 | */ | |
d1918542 | 2324 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2325 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2326 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2327 | (dst_mtu(&rt->dst) < arg->mtu && | |
2328 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2329 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2330 | } |
1da177e4 LT |
2331 | return 0; |
2332 | } | |
2333 | ||
95c96174 | 2334 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2335 | { |
c71099ac TG |
2336 | struct rt6_mtu_change_arg arg = { |
2337 | .dev = dev, | |
2338 | .mtu = mtu, | |
2339 | }; | |
1da177e4 | 2340 | |
0c3584d5 | 2341 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); |
1da177e4 LT |
2342 | } |
2343 | ||
ef7c79ed | 2344 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2345 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2346 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2347 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2348 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2349 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2350 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
86872cb5 TG |
2351 | }; |
2352 | ||
2353 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2354 | struct fib6_config *cfg) | |
1da177e4 | 2355 | { |
86872cb5 TG |
2356 | struct rtmsg *rtm; |
2357 | struct nlattr *tb[RTA_MAX+1]; | |
2358 | int err; | |
1da177e4 | 2359 | |
86872cb5 TG |
2360 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2361 | if (err < 0) | |
2362 | goto errout; | |
1da177e4 | 2363 | |
86872cb5 TG |
2364 | err = -EINVAL; |
2365 | rtm = nlmsg_data(nlh); | |
2366 | memset(cfg, 0, sizeof(*cfg)); | |
2367 | ||
2368 | cfg->fc_table = rtm->rtm_table; | |
2369 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2370 | cfg->fc_src_len = rtm->rtm_src_len; | |
2371 | cfg->fc_flags = RTF_UP; | |
2372 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2373 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2374 | |
ef2c7d7b ND |
2375 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2376 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2377 | rtm->rtm_type == RTN_PROHIBIT || |
2378 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2379 | cfg->fc_flags |= RTF_REJECT; |
2380 | ||
ab79ad14 MŻ |
2381 | if (rtm->rtm_type == RTN_LOCAL) |
2382 | cfg->fc_flags |= RTF_LOCAL; | |
2383 | ||
15e47304 | 2384 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2385 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2386 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2387 | |
2388 | if (tb[RTA_GATEWAY]) { | |
2389 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2390 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2391 | } |
86872cb5 TG |
2392 | |
2393 | if (tb[RTA_DST]) { | |
2394 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2395 | ||
2396 | if (nla_len(tb[RTA_DST]) < plen) | |
2397 | goto errout; | |
2398 | ||
2399 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2400 | } |
86872cb5 TG |
2401 | |
2402 | if (tb[RTA_SRC]) { | |
2403 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2404 | ||
2405 | if (nla_len(tb[RTA_SRC]) < plen) | |
2406 | goto errout; | |
2407 | ||
2408 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2409 | } |
86872cb5 | 2410 | |
c3968a85 DW |
2411 | if (tb[RTA_PREFSRC]) |
2412 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2413 | ||
86872cb5 TG |
2414 | if (tb[RTA_OIF]) |
2415 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2416 | ||
2417 | if (tb[RTA_PRIORITY]) | |
2418 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2419 | ||
2420 | if (tb[RTA_METRICS]) { | |
2421 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2422 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2423 | } |
86872cb5 TG |
2424 | |
2425 | if (tb[RTA_TABLE]) | |
2426 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2427 | ||
51ebd318 ND |
2428 | if (tb[RTA_MULTIPATH]) { |
2429 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2430 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2431 | } | |
2432 | ||
86872cb5 TG |
2433 | err = 0; |
2434 | errout: | |
2435 | return err; | |
1da177e4 LT |
2436 | } |
2437 | ||
51ebd318 ND |
2438 | static int ip6_route_multipath(struct fib6_config *cfg, int add) |
2439 | { | |
2440 | struct fib6_config r_cfg; | |
2441 | struct rtnexthop *rtnh; | |
2442 | int remaining; | |
2443 | int attrlen; | |
2444 | int err = 0, last_err = 0; | |
2445 | ||
2446 | beginning: | |
2447 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2448 | remaining = cfg->fc_mp_len; | |
2449 | ||
2450 | /* Parse a Multipath Entry */ | |
2451 | while (rtnh_ok(rtnh, remaining)) { | |
2452 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2453 | if (rtnh->rtnh_ifindex) | |
2454 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2455 | ||
2456 | attrlen = rtnh_attrlen(rtnh); | |
2457 | if (attrlen > 0) { | |
2458 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2459 | ||
2460 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2461 | if (nla) { | |
2462 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2463 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2464 | } | |
2465 | } | |
2466 | err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); | |
2467 | if (err) { | |
2468 | last_err = err; | |
2469 | /* If we are trying to remove a route, do not stop the | |
2470 | * loop when ip6_route_del() fails (because next hop is | |
2471 | * already gone), we should try to remove all next hops. | |
2472 | */ | |
2473 | if (add) { | |
2474 | /* If add fails, we should try to delete all | |
2475 | * next hops that have been already added. | |
2476 | */ | |
2477 | add = 0; | |
2478 | goto beginning; | |
2479 | } | |
2480 | } | |
1a72418b ND |
2481 | /* Because each route is added like a single route we remove |
2482 | * this flag after the first nexthop (if there is a collision, | |
2483 | * we have already fail to add the first nexthop: | |
2484 | * fib6_add_rt2node() has reject it). | |
2485 | */ | |
2486 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; | |
51ebd318 ND |
2487 | rtnh = rtnh_next(rtnh, &remaining); |
2488 | } | |
2489 | ||
2490 | return last_err; | |
2491 | } | |
2492 | ||
661d2967 | 2493 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh) |
1da177e4 | 2494 | { |
86872cb5 TG |
2495 | struct fib6_config cfg; |
2496 | int err; | |
1da177e4 | 2497 | |
86872cb5 TG |
2498 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2499 | if (err < 0) | |
2500 | return err; | |
2501 | ||
51ebd318 ND |
2502 | if (cfg.fc_mp) |
2503 | return ip6_route_multipath(&cfg, 0); | |
2504 | else | |
2505 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2506 | } |
2507 | ||
661d2967 | 2508 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh) |
1da177e4 | 2509 | { |
86872cb5 TG |
2510 | struct fib6_config cfg; |
2511 | int err; | |
1da177e4 | 2512 | |
86872cb5 TG |
2513 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2514 | if (err < 0) | |
2515 | return err; | |
2516 | ||
51ebd318 ND |
2517 | if (cfg.fc_mp) |
2518 | return ip6_route_multipath(&cfg, 1); | |
2519 | else | |
2520 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2521 | } |
2522 | ||
339bf98f TG |
2523 | static inline size_t rt6_nlmsg_size(void) |
2524 | { | |
2525 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2526 | + nla_total_size(16) /* RTA_SRC */ | |
2527 | + nla_total_size(16) /* RTA_DST */ | |
2528 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2529 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2530 | + nla_total_size(4) /* RTA_TABLE */ | |
2531 | + nla_total_size(4) /* RTA_IIF */ | |
2532 | + nla_total_size(4) /* RTA_OIF */ | |
2533 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2534 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2535 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2536 | } | |
2537 | ||
191cd582 BH |
2538 | static int rt6_fill_node(struct net *net, |
2539 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2540 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2541 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2542 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2543 | { |
2544 | struct rtmsg *rtm; | |
2d7202bf | 2545 | struct nlmsghdr *nlh; |
e3703b3d | 2546 | long expires; |
9e762a4a | 2547 | u32 table; |
1da177e4 LT |
2548 | |
2549 | if (prefix) { /* user wants prefix routes only */ | |
2550 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2551 | /* success since this is not a prefix route */ | |
2552 | return 1; | |
2553 | } | |
2554 | } | |
2555 | ||
15e47304 | 2556 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2557 | if (!nlh) |
26932566 | 2558 | return -EMSGSIZE; |
2d7202bf TG |
2559 | |
2560 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2561 | rtm->rtm_family = AF_INET6; |
2562 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2563 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2564 | rtm->rtm_tos = 0; | |
c71099ac | 2565 | if (rt->rt6i_table) |
9e762a4a | 2566 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2567 | else |
9e762a4a PM |
2568 | table = RT6_TABLE_UNSPEC; |
2569 | rtm->rtm_table = table; | |
c78679e8 DM |
2570 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2571 | goto nla_put_failure; | |
ef2c7d7b ND |
2572 | if (rt->rt6i_flags & RTF_REJECT) { |
2573 | switch (rt->dst.error) { | |
2574 | case -EINVAL: | |
2575 | rtm->rtm_type = RTN_BLACKHOLE; | |
2576 | break; | |
2577 | case -EACCES: | |
2578 | rtm->rtm_type = RTN_PROHIBIT; | |
2579 | break; | |
b4949ab2 ND |
2580 | case -EAGAIN: |
2581 | rtm->rtm_type = RTN_THROW; | |
2582 | break; | |
ef2c7d7b ND |
2583 | default: |
2584 | rtm->rtm_type = RTN_UNREACHABLE; | |
2585 | break; | |
2586 | } | |
2587 | } | |
38308473 | 2588 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2589 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2590 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2591 | rtm->rtm_type = RTN_LOCAL; |
2592 | else | |
2593 | rtm->rtm_type = RTN_UNICAST; | |
2594 | rtm->rtm_flags = 0; | |
2595 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2596 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2597 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2598 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2599 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2600 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2601 | rtm->rtm_protocol = RTPROT_RA; | |
2602 | else | |
2603 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2604 | } | |
1da177e4 | 2605 | |
38308473 | 2606 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2607 | rtm->rtm_flags |= RTM_F_CLONED; |
2608 | ||
2609 | if (dst) { | |
c78679e8 DM |
2610 | if (nla_put(skb, RTA_DST, 16, dst)) |
2611 | goto nla_put_failure; | |
1ab1457c | 2612 | rtm->rtm_dst_len = 128; |
1da177e4 | 2613 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2614 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2615 | goto nla_put_failure; | |
1da177e4 LT |
2616 | #ifdef CONFIG_IPV6_SUBTREES |
2617 | if (src) { | |
c78679e8 DM |
2618 | if (nla_put(skb, RTA_SRC, 16, src)) |
2619 | goto nla_put_failure; | |
1ab1457c | 2620 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2621 | } else if (rtm->rtm_src_len && |
2622 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2623 | goto nla_put_failure; | |
1da177e4 | 2624 | #endif |
7bc570c8 YH |
2625 | if (iif) { |
2626 | #ifdef CONFIG_IPV6_MROUTE | |
2627 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2628 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2629 | if (err <= 0) { |
2630 | if (!nowait) { | |
2631 | if (err == 0) | |
2632 | return 0; | |
2633 | goto nla_put_failure; | |
2634 | } else { | |
2635 | if (err == -EMSGSIZE) | |
2636 | goto nla_put_failure; | |
2637 | } | |
2638 | } | |
2639 | } else | |
2640 | #endif | |
c78679e8 DM |
2641 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2642 | goto nla_put_failure; | |
7bc570c8 | 2643 | } else if (dst) { |
1da177e4 | 2644 | struct in6_addr saddr_buf; |
c78679e8 DM |
2645 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2646 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2647 | goto nla_put_failure; | |
1da177e4 | 2648 | } |
2d7202bf | 2649 | |
c3968a85 DW |
2650 | if (rt->rt6i_prefsrc.plen) { |
2651 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2652 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2653 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2654 | goto nla_put_failure; | |
c3968a85 DW |
2655 | } |
2656 | ||
defb3519 | 2657 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2658 | goto nla_put_failure; |
2659 | ||
dd0cbf29 YH |
2660 | if (rt->rt6i_flags & RTF_GATEWAY) { |
2661 | if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) | |
94f826b8 | 2662 | goto nla_put_failure; |
94f826b8 | 2663 | } |
2d7202bf | 2664 | |
c78679e8 DM |
2665 | if (rt->dst.dev && |
2666 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2667 | goto nla_put_failure; | |
2668 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2669 | goto nla_put_failure; | |
8253947e LW |
2670 | |
2671 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2672 | |
87a50699 | 2673 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2674 | goto nla_put_failure; |
2d7202bf TG |
2675 | |
2676 | return nlmsg_end(skb, nlh); | |
2677 | ||
2678 | nla_put_failure: | |
26932566 PM |
2679 | nlmsg_cancel(skb, nlh); |
2680 | return -EMSGSIZE; | |
1da177e4 LT |
2681 | } |
2682 | ||
1b43af54 | 2683 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2684 | { |
2685 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2686 | int prefix; | |
2687 | ||
2d7202bf TG |
2688 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2689 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2690 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2691 | } else | |
2692 | prefix = 0; | |
2693 | ||
191cd582 BH |
2694 | return rt6_fill_node(arg->net, |
2695 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2696 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2697 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2698 | } |
2699 | ||
661d2967 | 2700 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh) |
1da177e4 | 2701 | { |
3b1e0a65 | 2702 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2703 | struct nlattr *tb[RTA_MAX+1]; |
2704 | struct rt6_info *rt; | |
1da177e4 | 2705 | struct sk_buff *skb; |
ab364a6f | 2706 | struct rtmsg *rtm; |
4c9483b2 | 2707 | struct flowi6 fl6; |
72331bc0 | 2708 | int err, iif = 0, oif = 0; |
1da177e4 | 2709 | |
ab364a6f TG |
2710 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2711 | if (err < 0) | |
2712 | goto errout; | |
1da177e4 | 2713 | |
ab364a6f | 2714 | err = -EINVAL; |
4c9483b2 | 2715 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2716 | |
ab364a6f TG |
2717 | if (tb[RTA_SRC]) { |
2718 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2719 | goto errout; | |
2720 | ||
4e3fd7a0 | 2721 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2722 | } |
2723 | ||
2724 | if (tb[RTA_DST]) { | |
2725 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2726 | goto errout; | |
2727 | ||
4e3fd7a0 | 2728 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2729 | } |
2730 | ||
2731 | if (tb[RTA_IIF]) | |
2732 | iif = nla_get_u32(tb[RTA_IIF]); | |
2733 | ||
2734 | if (tb[RTA_OIF]) | |
72331bc0 | 2735 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2736 | |
2737 | if (iif) { | |
2738 | struct net_device *dev; | |
72331bc0 SL |
2739 | int flags = 0; |
2740 | ||
5578689a | 2741 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2742 | if (!dev) { |
2743 | err = -ENODEV; | |
ab364a6f | 2744 | goto errout; |
1da177e4 | 2745 | } |
72331bc0 SL |
2746 | |
2747 | fl6.flowi6_iif = iif; | |
2748 | ||
2749 | if (!ipv6_addr_any(&fl6.saddr)) | |
2750 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2751 | ||
2752 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2753 | flags); | |
2754 | } else { | |
2755 | fl6.flowi6_oif = oif; | |
2756 | ||
2757 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2758 | } |
2759 | ||
ab364a6f | 2760 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2761 | if (!skb) { |
94e187c0 | 2762 | ip6_rt_put(rt); |
ab364a6f TG |
2763 | err = -ENOBUFS; |
2764 | goto errout; | |
2765 | } | |
1da177e4 | 2766 | |
ab364a6f TG |
2767 | /* Reserve room for dummy headers, this skb can pass |
2768 | through good chunk of routing engine. | |
2769 | */ | |
459a98ed | 2770 | skb_reset_mac_header(skb); |
ab364a6f | 2771 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2772 | |
d8d1f30b | 2773 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2774 | |
4c9483b2 | 2775 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 2776 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 2777 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2778 | if (err < 0) { |
ab364a6f TG |
2779 | kfree_skb(skb); |
2780 | goto errout; | |
1da177e4 LT |
2781 | } |
2782 | ||
15e47304 | 2783 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 2784 | errout: |
1da177e4 | 2785 | return err; |
1da177e4 LT |
2786 | } |
2787 | ||
86872cb5 | 2788 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2789 | { |
2790 | struct sk_buff *skb; | |
5578689a | 2791 | struct net *net = info->nl_net; |
528c4ceb DL |
2792 | u32 seq; |
2793 | int err; | |
2794 | ||
2795 | err = -ENOBUFS; | |
38308473 | 2796 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2797 | |
339bf98f | 2798 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2799 | if (!skb) |
21713ebc TG |
2800 | goto errout; |
2801 | ||
191cd582 | 2802 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 2803 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
2804 | if (err < 0) { |
2805 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2806 | WARN_ON(err == -EMSGSIZE); | |
2807 | kfree_skb(skb); | |
2808 | goto errout; | |
2809 | } | |
15e47304 | 2810 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
2811 | info->nlh, gfp_any()); |
2812 | return; | |
21713ebc TG |
2813 | errout: |
2814 | if (err < 0) | |
5578689a | 2815 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2816 | } |
2817 | ||
8ed67789 | 2818 | static int ip6_route_dev_notify(struct notifier_block *this, |
351638e7 | 2819 | unsigned long event, void *ptr) |
8ed67789 | 2820 | { |
351638e7 | 2821 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 2822 | struct net *net = dev_net(dev); |
8ed67789 DL |
2823 | |
2824 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2825 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2826 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2827 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2828 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2829 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2830 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2831 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2832 | #endif | |
2833 | } | |
2834 | ||
2835 | return NOTIFY_OK; | |
2836 | } | |
2837 | ||
1da177e4 LT |
2838 | /* |
2839 | * /proc | |
2840 | */ | |
2841 | ||
2842 | #ifdef CONFIG_PROC_FS | |
2843 | ||
33120b30 AD |
2844 | static const struct file_operations ipv6_route_proc_fops = { |
2845 | .owner = THIS_MODULE, | |
2846 | .open = ipv6_route_open, | |
2847 | .read = seq_read, | |
2848 | .llseek = seq_lseek, | |
8d2ca1d7 | 2849 | .release = seq_release_net, |
33120b30 AD |
2850 | }; |
2851 | ||
1da177e4 LT |
2852 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2853 | { | |
69ddb805 | 2854 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2855 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2856 | net->ipv6.rt6_stats->fib_nodes, |
2857 | net->ipv6.rt6_stats->fib_route_nodes, | |
2858 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2859 | net->ipv6.rt6_stats->fib_rt_entries, | |
2860 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2861 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2862 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2863 | |
2864 | return 0; | |
2865 | } | |
2866 | ||
2867 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2868 | { | |
de05c557 | 2869 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2870 | } |
2871 | ||
9a32144e | 2872 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2873 | .owner = THIS_MODULE, |
2874 | .open = rt6_stats_seq_open, | |
2875 | .read = seq_read, | |
2876 | .llseek = seq_lseek, | |
b6fcbdb4 | 2877 | .release = single_release_net, |
1da177e4 LT |
2878 | }; |
2879 | #endif /* CONFIG_PROC_FS */ | |
2880 | ||
2881 | #ifdef CONFIG_SYSCTL | |
2882 | ||
1da177e4 | 2883 | static |
fe2c6338 | 2884 | int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, |
1da177e4 LT |
2885 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2886 | { | |
c486da34 LAG |
2887 | struct net *net; |
2888 | int delay; | |
2889 | if (!write) | |
1da177e4 | 2890 | return -EINVAL; |
c486da34 LAG |
2891 | |
2892 | net = (struct net *)ctl->extra1; | |
2893 | delay = net->ipv6.sysctl.flush_delay; | |
2894 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2ac3ac8f | 2895 | fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); |
c486da34 | 2896 | return 0; |
1da177e4 LT |
2897 | } |
2898 | ||
fe2c6338 | 2899 | struct ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2900 | { |
1da177e4 | 2901 | .procname = "flush", |
4990509f | 2902 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2903 | .maxlen = sizeof(int), |
89c8b3a1 | 2904 | .mode = 0200, |
6d9f239a | 2905 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2906 | }, |
2907 | { | |
1da177e4 | 2908 | .procname = "gc_thresh", |
9a7ec3a9 | 2909 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2910 | .maxlen = sizeof(int), |
2911 | .mode = 0644, | |
6d9f239a | 2912 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2913 | }, |
2914 | { | |
1da177e4 | 2915 | .procname = "max_size", |
4990509f | 2916 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2917 | .maxlen = sizeof(int), |
2918 | .mode = 0644, | |
6d9f239a | 2919 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2920 | }, |
2921 | { | |
1da177e4 | 2922 | .procname = "gc_min_interval", |
4990509f | 2923 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2924 | .maxlen = sizeof(int), |
2925 | .mode = 0644, | |
6d9f239a | 2926 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2927 | }, |
2928 | { | |
1da177e4 | 2929 | .procname = "gc_timeout", |
4990509f | 2930 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2931 | .maxlen = sizeof(int), |
2932 | .mode = 0644, | |
6d9f239a | 2933 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2934 | }, |
2935 | { | |
1da177e4 | 2936 | .procname = "gc_interval", |
4990509f | 2937 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2938 | .maxlen = sizeof(int), |
2939 | .mode = 0644, | |
6d9f239a | 2940 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2941 | }, |
2942 | { | |
1da177e4 | 2943 | .procname = "gc_elasticity", |
4990509f | 2944 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2945 | .maxlen = sizeof(int), |
2946 | .mode = 0644, | |
f3d3f616 | 2947 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2948 | }, |
2949 | { | |
1da177e4 | 2950 | .procname = "mtu_expires", |
4990509f | 2951 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2952 | .maxlen = sizeof(int), |
2953 | .mode = 0644, | |
6d9f239a | 2954 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2955 | }, |
2956 | { | |
1da177e4 | 2957 | .procname = "min_adv_mss", |
4990509f | 2958 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2959 | .maxlen = sizeof(int), |
2960 | .mode = 0644, | |
f3d3f616 | 2961 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2962 | }, |
2963 | { | |
1da177e4 | 2964 | .procname = "gc_min_interval_ms", |
4990509f | 2965 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2966 | .maxlen = sizeof(int), |
2967 | .mode = 0644, | |
6d9f239a | 2968 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2969 | }, |
f8572d8f | 2970 | { } |
1da177e4 LT |
2971 | }; |
2972 | ||
2c8c1e72 | 2973 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2974 | { |
2975 | struct ctl_table *table; | |
2976 | ||
2977 | table = kmemdup(ipv6_route_table_template, | |
2978 | sizeof(ipv6_route_table_template), | |
2979 | GFP_KERNEL); | |
5ee09105 YH |
2980 | |
2981 | if (table) { | |
2982 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2983 | table[0].extra1 = net; |
86393e52 | 2984 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2985 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2986 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2987 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2988 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2989 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2990 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2991 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2992 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
2993 | |
2994 | /* Don't export sysctls to unprivileged users */ | |
2995 | if (net->user_ns != &init_user_ns) | |
2996 | table[0].procname = NULL; | |
5ee09105 YH |
2997 | } |
2998 | ||
760f2d01 DL |
2999 | return table; |
3000 | } | |
1da177e4 LT |
3001 | #endif |
3002 | ||
2c8c1e72 | 3003 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 3004 | { |
633d424b | 3005 | int ret = -ENOMEM; |
8ed67789 | 3006 | |
86393e52 AD |
3007 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
3008 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 3009 | |
fc66f95c ED |
3010 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
3011 | goto out_ip6_dst_ops; | |
3012 | ||
8ed67789 DL |
3013 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
3014 | sizeof(*net->ipv6.ip6_null_entry), | |
3015 | GFP_KERNEL); | |
3016 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 3017 | goto out_ip6_dst_entries; |
d8d1f30b | 3018 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 3019 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 3020 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3021 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
3022 | ip6_template_metrics, true); | |
8ed67789 DL |
3023 | |
3024 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3025 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
3026 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
3027 | GFP_KERNEL); | |
68fffc67 PZ |
3028 | if (!net->ipv6.ip6_prohibit_entry) |
3029 | goto out_ip6_null_entry; | |
d8d1f30b | 3030 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 3031 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 3032 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3033 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
3034 | ip6_template_metrics, true); | |
8ed67789 DL |
3035 | |
3036 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
3037 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
3038 | GFP_KERNEL); | |
68fffc67 PZ |
3039 | if (!net->ipv6.ip6_blk_hole_entry) |
3040 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 3041 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 3042 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 3043 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
3044 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
3045 | ip6_template_metrics, true); | |
8ed67789 DL |
3046 | #endif |
3047 | ||
b339a47c PZ |
3048 | net->ipv6.sysctl.flush_delay = 0; |
3049 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
3050 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
3051 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
3052 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
3053 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
3054 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
3055 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
3056 | ||
6891a346 BT |
3057 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
3058 | ||
8ed67789 DL |
3059 | ret = 0; |
3060 | out: | |
3061 | return ret; | |
f2fc6a54 | 3062 | |
68fffc67 PZ |
3063 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
3064 | out_ip6_prohibit_entry: | |
3065 | kfree(net->ipv6.ip6_prohibit_entry); | |
3066 | out_ip6_null_entry: | |
3067 | kfree(net->ipv6.ip6_null_entry); | |
3068 | #endif | |
fc66f95c ED |
3069 | out_ip6_dst_entries: |
3070 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 3071 | out_ip6_dst_ops: |
f2fc6a54 | 3072 | goto out; |
cdb18761 DL |
3073 | } |
3074 | ||
2c8c1e72 | 3075 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 3076 | { |
8ed67789 DL |
3077 | kfree(net->ipv6.ip6_null_entry); |
3078 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
3079 | kfree(net->ipv6.ip6_prohibit_entry); | |
3080 | kfree(net->ipv6.ip6_blk_hole_entry); | |
3081 | #endif | |
41bb78b4 | 3082 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
3083 | } |
3084 | ||
d189634e TG |
3085 | static int __net_init ip6_route_net_init_late(struct net *net) |
3086 | { | |
3087 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
3088 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
3089 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3090 | #endif |
3091 | return 0; | |
3092 | } | |
3093 | ||
3094 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3095 | { | |
3096 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3097 | remove_proc_entry("ipv6_route", net->proc_net); |
3098 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3099 | #endif |
3100 | } | |
3101 | ||
cdb18761 DL |
3102 | static struct pernet_operations ip6_route_net_ops = { |
3103 | .init = ip6_route_net_init, | |
3104 | .exit = ip6_route_net_exit, | |
3105 | }; | |
3106 | ||
c3426b47 DM |
3107 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3108 | { | |
3109 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3110 | ||
3111 | if (!bp) | |
3112 | return -ENOMEM; | |
3113 | inet_peer_base_init(bp); | |
3114 | net->ipv6.peers = bp; | |
3115 | return 0; | |
3116 | } | |
3117 | ||
3118 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3119 | { | |
3120 | struct inet_peer_base *bp = net->ipv6.peers; | |
3121 | ||
3122 | net->ipv6.peers = NULL; | |
56a6b248 | 3123 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3124 | kfree(bp); |
3125 | } | |
3126 | ||
2b823f72 | 3127 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3128 | .init = ipv6_inetpeer_init, |
3129 | .exit = ipv6_inetpeer_exit, | |
3130 | }; | |
3131 | ||
d189634e TG |
3132 | static struct pernet_operations ip6_route_net_late_ops = { |
3133 | .init = ip6_route_net_init_late, | |
3134 | .exit = ip6_route_net_exit_late, | |
3135 | }; | |
3136 | ||
8ed67789 DL |
3137 | static struct notifier_block ip6_route_dev_notifier = { |
3138 | .notifier_call = ip6_route_dev_notify, | |
3139 | .priority = 0, | |
3140 | }; | |
3141 | ||
433d49c3 | 3142 | int __init ip6_route_init(void) |
1da177e4 | 3143 | { |
433d49c3 DL |
3144 | int ret; |
3145 | ||
9a7ec3a9 DL |
3146 | ret = -ENOMEM; |
3147 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3148 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3149 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3150 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3151 | goto out; |
14e50e57 | 3152 | |
fc66f95c | 3153 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3154 | if (ret) |
bdb3289f | 3155 | goto out_kmem_cache; |
bdb3289f | 3156 | |
c3426b47 DM |
3157 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3158 | if (ret) | |
e8803b6c | 3159 | goto out_dst_entries; |
2a0c451a | 3160 | |
7e52b33b DM |
3161 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3162 | if (ret) | |
3163 | goto out_register_inetpeer; | |
c3426b47 | 3164 | |
5dc121e9 AE |
3165 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3166 | ||
8ed67789 DL |
3167 | /* Registering of the loopback is done before this portion of code, |
3168 | * the loopback reference in rt6_info will not be taken, do it | |
3169 | * manually for init_net */ | |
d8d1f30b | 3170 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3171 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3172 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3173 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3174 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3175 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3176 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3177 | #endif | |
e8803b6c | 3178 | ret = fib6_init(); |
433d49c3 | 3179 | if (ret) |
8ed67789 | 3180 | goto out_register_subsys; |
433d49c3 | 3181 | |
433d49c3 DL |
3182 | ret = xfrm6_init(); |
3183 | if (ret) | |
e8803b6c | 3184 | goto out_fib6_init; |
c35b7e72 | 3185 | |
433d49c3 DL |
3186 | ret = fib6_rules_init(); |
3187 | if (ret) | |
3188 | goto xfrm6_init; | |
7e5449c2 | 3189 | |
d189634e TG |
3190 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3191 | if (ret) | |
3192 | goto fib6_rules_init; | |
3193 | ||
433d49c3 | 3194 | ret = -ENOBUFS; |
c7ac8679 GR |
3195 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3196 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3197 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3198 | goto out_register_late_subsys; |
c127ea2c | 3199 | |
8ed67789 | 3200 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3201 | if (ret) |
d189634e | 3202 | goto out_register_late_subsys; |
8ed67789 | 3203 | |
433d49c3 DL |
3204 | out: |
3205 | return ret; | |
3206 | ||
d189634e TG |
3207 | out_register_late_subsys: |
3208 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3209 | fib6_rules_init: |
433d49c3 DL |
3210 | fib6_rules_cleanup(); |
3211 | xfrm6_init: | |
433d49c3 | 3212 | xfrm6_fini(); |
2a0c451a TG |
3213 | out_fib6_init: |
3214 | fib6_gc_cleanup(); | |
8ed67789 DL |
3215 | out_register_subsys: |
3216 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3217 | out_register_inetpeer: |
3218 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3219 | out_dst_entries: |
3220 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3221 | out_kmem_cache: |
f2fc6a54 | 3222 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3223 | goto out; |
1da177e4 LT |
3224 | } |
3225 | ||
3226 | void ip6_route_cleanup(void) | |
3227 | { | |
8ed67789 | 3228 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3229 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3230 | fib6_rules_cleanup(); |
1da177e4 | 3231 | xfrm6_fini(); |
1da177e4 | 3232 | fib6_gc_cleanup(); |
c3426b47 | 3233 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3234 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3235 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3236 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3237 | } |