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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 | ||
1716a961 | 68 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 69 | const struct in6_addr *dest); |
1da177e4 | 70 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 71 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 72 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
73 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
74 | static void ip6_dst_destroy(struct dst_entry *); | |
75 | static void ip6_dst_ifdown(struct dst_entry *, | |
76 | struct net_device *dev, int how); | |
569d3645 | 77 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
78 | |
79 | static int ip6_pkt_discard(struct sk_buff *skb); | |
80 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
81 | static void ip6_link_failure(struct sk_buff *skb); | |
6700c270 DM |
82 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
83 | struct sk_buff *skb, u32 mtu); | |
84 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, | |
85 | struct sk_buff *skb); | |
1da177e4 | 86 | |
70ceb4f5 | 87 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 88 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
89 | const struct in6_addr *prefix, int prefixlen, |
90 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 91 | unsigned int pref); |
efa2cea0 | 92 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
93 | const struct in6_addr *prefix, int prefixlen, |
94 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
95 | #endif |
96 | ||
06582540 DM |
97 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
98 | { | |
99 | struct rt6_info *rt = (struct rt6_info *) dst; | |
100 | struct inet_peer *peer; | |
101 | u32 *p = NULL; | |
102 | ||
8e2ec639 YZ |
103 | if (!(rt->dst.flags & DST_HOST)) |
104 | return NULL; | |
105 | ||
fbfe95a4 | 106 | peer = rt6_get_peer_create(rt); |
06582540 DM |
107 | if (peer) { |
108 | u32 *old_p = __DST_METRICS_PTR(old); | |
109 | unsigned long prev, new; | |
110 | ||
111 | p = peer->metrics; | |
112 | if (inet_metrics_new(peer)) | |
113 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
114 | ||
115 | new = (unsigned long) p; | |
116 | prev = cmpxchg(&dst->_metrics, old, new); | |
117 | ||
118 | if (prev != old) { | |
119 | p = __DST_METRICS_PTR(prev); | |
120 | if (prev & DST_METRICS_READ_ONLY) | |
121 | p = NULL; | |
122 | } | |
123 | } | |
124 | return p; | |
125 | } | |
126 | ||
f894cbf8 DM |
127 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, |
128 | struct sk_buff *skb, | |
129 | const void *daddr) | |
39232973 DM |
130 | { |
131 | struct in6_addr *p = &rt->rt6i_gateway; | |
132 | ||
a7563f34 | 133 | if (!ipv6_addr_any(p)) |
39232973 | 134 | return (const void *) p; |
f894cbf8 DM |
135 | else if (skb) |
136 | return &ipv6_hdr(skb)->daddr; | |
39232973 DM |
137 | return daddr; |
138 | } | |
139 | ||
f894cbf8 DM |
140 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, |
141 | struct sk_buff *skb, | |
142 | const void *daddr) | |
d3aaeb38 | 143 | { |
39232973 DM |
144 | struct rt6_info *rt = (struct rt6_info *) dst; |
145 | struct neighbour *n; | |
146 | ||
f894cbf8 | 147 | daddr = choose_neigh_daddr(rt, skb, daddr); |
8e022ee6 | 148 | n = __ipv6_neigh_lookup(dst->dev, daddr); |
f83c7790 DM |
149 | if (n) |
150 | return n; | |
151 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
152 | } | |
153 | ||
9a7ec3a9 | 154 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 155 | .family = AF_INET6, |
09640e63 | 156 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
157 | .gc = ip6_dst_gc, |
158 | .gc_thresh = 1024, | |
159 | .check = ip6_dst_check, | |
0dbaee3b | 160 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 161 | .mtu = ip6_mtu, |
06582540 | 162 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
163 | .destroy = ip6_dst_destroy, |
164 | .ifdown = ip6_dst_ifdown, | |
165 | .negative_advice = ip6_negative_advice, | |
166 | .link_failure = ip6_link_failure, | |
167 | .update_pmtu = ip6_rt_update_pmtu, | |
6e157b6a | 168 | .redirect = rt6_do_redirect, |
1ac06e03 | 169 | .local_out = __ip6_local_out, |
d3aaeb38 | 170 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
171 | }; |
172 | ||
ebb762f2 | 173 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 174 | { |
618f9bc7 SK |
175 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
176 | ||
177 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
178 | } |
179 | ||
6700c270 DM |
180 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, |
181 | struct sk_buff *skb, u32 mtu) | |
14e50e57 DM |
182 | { |
183 | } | |
184 | ||
6700c270 DM |
185 | static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, |
186 | struct sk_buff *skb) | |
b587ee3b DM |
187 | { |
188 | } | |
189 | ||
0972ddb2 HB |
190 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
191 | unsigned long old) | |
192 | { | |
193 | return NULL; | |
194 | } | |
195 | ||
14e50e57 DM |
196 | static struct dst_ops ip6_dst_blackhole_ops = { |
197 | .family = AF_INET6, | |
09640e63 | 198 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
199 | .destroy = ip6_dst_destroy, |
200 | .check = ip6_dst_check, | |
ebb762f2 | 201 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 202 | .default_advmss = ip6_default_advmss, |
14e50e57 | 203 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
b587ee3b | 204 | .redirect = ip6_rt_blackhole_redirect, |
0972ddb2 | 205 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 206 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
207 | }; |
208 | ||
62fa8a84 | 209 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
14edd87d | 210 | [RTAX_HOPLIMIT - 1] = 0, |
62fa8a84 DM |
211 | }; |
212 | ||
fb0af4c7 | 213 | static const struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
214 | .dst = { |
215 | .__refcnt = ATOMIC_INIT(1), | |
216 | .__use = 1, | |
2c20cbd7 | 217 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 218 | .error = -ENETUNREACH, |
d8d1f30b CG |
219 | .input = ip6_pkt_discard, |
220 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
221 | }, |
222 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 223 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
224 | .rt6i_metric = ~(u32) 0, |
225 | .rt6i_ref = ATOMIC_INIT(1), | |
226 | }; | |
227 | ||
101367c2 TG |
228 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
229 | ||
6723ab54 DM |
230 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
231 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 232 | |
fb0af4c7 | 233 | static const struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
234 | .dst = { |
235 | .__refcnt = ATOMIC_INIT(1), | |
236 | .__use = 1, | |
2c20cbd7 | 237 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 238 | .error = -EACCES, |
d8d1f30b CG |
239 | .input = ip6_pkt_prohibit, |
240 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
241 | }, |
242 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 243 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
244 | .rt6i_metric = ~(u32) 0, |
245 | .rt6i_ref = ATOMIC_INIT(1), | |
246 | }; | |
247 | ||
fb0af4c7 | 248 | static const struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
249 | .dst = { |
250 | .__refcnt = ATOMIC_INIT(1), | |
251 | .__use = 1, | |
2c20cbd7 | 252 | .obsolete = DST_OBSOLETE_FORCE_CHK, |
d8d1f30b | 253 | .error = -EINVAL, |
d8d1f30b CG |
254 | .input = dst_discard, |
255 | .output = dst_discard, | |
101367c2 TG |
256 | }, |
257 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 258 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
259 | .rt6i_metric = ~(u32) 0, |
260 | .rt6i_ref = ATOMIC_INIT(1), | |
261 | }; | |
262 | ||
263 | #endif | |
264 | ||
1da177e4 | 265 | /* allocate dst with ip6_dst_ops */ |
97bab73f | 266 | static inline struct rt6_info *ip6_dst_alloc(struct net *net, |
957c665f | 267 | struct net_device *dev, |
8b96d22d DM |
268 | int flags, |
269 | struct fib6_table *table) | |
1da177e4 | 270 | { |
97bab73f | 271 | struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, |
6f3118b5 | 272 | 0, DST_OBSOLETE_FORCE_CHK, flags); |
cf911662 | 273 | |
97bab73f | 274 | if (rt) { |
8104891b SK |
275 | struct dst_entry *dst = &rt->dst; |
276 | ||
277 | memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); | |
8b96d22d | 278 | rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); |
6f3118b5 | 279 | rt->rt6i_genid = rt_genid(net); |
51ebd318 ND |
280 | INIT_LIST_HEAD(&rt->rt6i_siblings); |
281 | rt->rt6i_nsiblings = 0; | |
97bab73f | 282 | } |
cf911662 | 283 | return rt; |
1da177e4 LT |
284 | } |
285 | ||
286 | static void ip6_dst_destroy(struct dst_entry *dst) | |
287 | { | |
288 | struct rt6_info *rt = (struct rt6_info *)dst; | |
289 | struct inet6_dev *idev = rt->rt6i_idev; | |
290 | ||
8e2ec639 YZ |
291 | if (!(rt->dst.flags & DST_HOST)) |
292 | dst_destroy_metrics_generic(dst); | |
293 | ||
38308473 | 294 | if (idev) { |
1da177e4 LT |
295 | rt->rt6i_idev = NULL; |
296 | in6_dev_put(idev); | |
1ab1457c | 297 | } |
1716a961 G |
298 | |
299 | if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from) | |
300 | dst_release(dst->from); | |
301 | ||
97bab73f DM |
302 | if (rt6_has_peer(rt)) { |
303 | struct inet_peer *peer = rt6_peer_ptr(rt); | |
b3419363 DM |
304 | inet_putpeer(peer); |
305 | } | |
306 | } | |
307 | ||
308 | void rt6_bind_peer(struct rt6_info *rt, int create) | |
309 | { | |
97bab73f | 310 | struct inet_peer_base *base; |
b3419363 DM |
311 | struct inet_peer *peer; |
312 | ||
97bab73f DM |
313 | base = inetpeer_base_ptr(rt->_rt6i_peer); |
314 | if (!base) | |
315 | return; | |
316 | ||
317 | peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); | |
7b34ca2a DM |
318 | if (peer) { |
319 | if (!rt6_set_peer(rt, peer)) | |
320 | inet_putpeer(peer); | |
7b34ca2a | 321 | } |
1da177e4 LT |
322 | } |
323 | ||
324 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
325 | int how) | |
326 | { | |
327 | struct rt6_info *rt = (struct rt6_info *)dst; | |
328 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 329 | struct net_device *loopback_dev = |
c346dca1 | 330 | dev_net(dev)->loopback_dev; |
1da177e4 | 331 | |
97cac082 DM |
332 | if (dev != loopback_dev) { |
333 | if (idev && idev->dev == dev) { | |
334 | struct inet6_dev *loopback_idev = | |
335 | in6_dev_get(loopback_dev); | |
336 | if (loopback_idev) { | |
337 | rt->rt6i_idev = loopback_idev; | |
338 | in6_dev_put(idev); | |
339 | } | |
340 | } | |
1da177e4 LT |
341 | } |
342 | } | |
343 | ||
a50feda5 | 344 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 345 | { |
1716a961 G |
346 | if (rt->rt6i_flags & RTF_EXPIRES) { |
347 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 348 | return true; |
1716a961 | 349 | } else if (rt->dst.from) { |
3fd91fb3 | 350 | return rt6_check_expired((struct rt6_info *) rt->dst.from); |
1716a961 | 351 | } |
a50feda5 | 352 | return false; |
1da177e4 LT |
353 | } |
354 | ||
a50feda5 | 355 | static bool rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 356 | { |
a02cec21 ED |
357 | return ipv6_addr_type(daddr) & |
358 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
359 | } |
360 | ||
51ebd318 ND |
361 | /* Multipath route selection: |
362 | * Hash based function using packet header and flowlabel. | |
363 | * Adapted from fib_info_hashfn() | |
364 | */ | |
365 | static int rt6_info_hash_nhsfn(unsigned int candidate_count, | |
366 | const struct flowi6 *fl6) | |
367 | { | |
368 | unsigned int val = fl6->flowi6_proto; | |
369 | ||
c08977bb YH |
370 | val ^= ipv6_addr_hash(&fl6->daddr); |
371 | val ^= ipv6_addr_hash(&fl6->saddr); | |
51ebd318 ND |
372 | |
373 | /* Work only if this not encapsulated */ | |
374 | switch (fl6->flowi6_proto) { | |
375 | case IPPROTO_UDP: | |
376 | case IPPROTO_TCP: | |
377 | case IPPROTO_SCTP: | |
b3ce5ae1 ND |
378 | val ^= (__force u16)fl6->fl6_sport; |
379 | val ^= (__force u16)fl6->fl6_dport; | |
51ebd318 ND |
380 | break; |
381 | ||
382 | case IPPROTO_ICMPV6: | |
b3ce5ae1 ND |
383 | val ^= (__force u16)fl6->fl6_icmp_type; |
384 | val ^= (__force u16)fl6->fl6_icmp_code; | |
51ebd318 ND |
385 | break; |
386 | } | |
387 | /* RFC6438 recommands to use flowlabel */ | |
b3ce5ae1 | 388 | val ^= (__force u32)fl6->flowlabel; |
51ebd318 ND |
389 | |
390 | /* Perhaps, we need to tune, this function? */ | |
391 | val = val ^ (val >> 7) ^ (val >> 12); | |
392 | return val % candidate_count; | |
393 | } | |
394 | ||
395 | static struct rt6_info *rt6_multipath_select(struct rt6_info *match, | |
396 | struct flowi6 *fl6) | |
397 | { | |
398 | struct rt6_info *sibling, *next_sibling; | |
399 | int route_choosen; | |
400 | ||
401 | route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); | |
402 | /* Don't change the route, if route_choosen == 0 | |
403 | * (siblings does not include ourself) | |
404 | */ | |
405 | if (route_choosen) | |
406 | list_for_each_entry_safe(sibling, next_sibling, | |
407 | &match->rt6i_siblings, rt6i_siblings) { | |
408 | route_choosen--; | |
409 | if (route_choosen == 0) { | |
410 | match = sibling; | |
411 | break; | |
412 | } | |
413 | } | |
414 | return match; | |
415 | } | |
416 | ||
1da177e4 | 417 | /* |
c71099ac | 418 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
419 | */ |
420 | ||
8ed67789 DL |
421 | static inline struct rt6_info *rt6_device_match(struct net *net, |
422 | struct rt6_info *rt, | |
b71d1d42 | 423 | const struct in6_addr *saddr, |
1da177e4 | 424 | int oif, |
d420895e | 425 | int flags) |
1da177e4 LT |
426 | { |
427 | struct rt6_info *local = NULL; | |
428 | struct rt6_info *sprt; | |
429 | ||
dd3abc4e YH |
430 | if (!oif && ipv6_addr_any(saddr)) |
431 | goto out; | |
432 | ||
d8d1f30b | 433 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 434 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
435 | |
436 | if (oif) { | |
1da177e4 LT |
437 | if (dev->ifindex == oif) |
438 | return sprt; | |
439 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 440 | if (!sprt->rt6i_idev || |
1da177e4 | 441 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 442 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 443 | continue; |
1ab1457c | 444 | if (local && (!oif || |
1da177e4 LT |
445 | local->rt6i_idev->dev->ifindex == oif)) |
446 | continue; | |
447 | } | |
448 | local = sprt; | |
449 | } | |
dd3abc4e YH |
450 | } else { |
451 | if (ipv6_chk_addr(net, saddr, dev, | |
452 | flags & RT6_LOOKUP_F_IFACE)) | |
453 | return sprt; | |
1da177e4 | 454 | } |
dd3abc4e | 455 | } |
1da177e4 | 456 | |
dd3abc4e | 457 | if (oif) { |
1da177e4 LT |
458 | if (local) |
459 | return local; | |
460 | ||
d420895e | 461 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 462 | return net->ipv6.ip6_null_entry; |
1da177e4 | 463 | } |
dd3abc4e | 464 | out: |
1da177e4 LT |
465 | return rt; |
466 | } | |
467 | ||
27097255 YH |
468 | #ifdef CONFIG_IPV6_ROUTER_PREF |
469 | static void rt6_probe(struct rt6_info *rt) | |
470 | { | |
f2c31e32 | 471 | struct neighbour *neigh; |
27097255 YH |
472 | /* |
473 | * Okay, this does not seem to be appropriate | |
474 | * for now, however, we need to check if it | |
475 | * is really so; aka Router Reachability Probing. | |
476 | * | |
477 | * Router Reachability Probe MUST be rate-limited | |
478 | * to no more than one per minute. | |
479 | */ | |
2152caea | 480 | if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) |
7ff74a59 | 481 | return; |
2152caea YH |
482 | rcu_read_lock_bh(); |
483 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
484 | if (neigh) { | |
485 | write_lock(&neigh->lock); | |
486 | if (neigh->nud_state & NUD_VALID) | |
487 | goto out; | |
7ff74a59 | 488 | } |
2152caea YH |
489 | |
490 | if (!neigh || | |
52e16356 | 491 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
492 | struct in6_addr mcaddr; |
493 | struct in6_addr *target; | |
494 | ||
b820bb6b YH |
495 | if (neigh) { |
496 | neigh->updated = jiffies; | |
2152caea | 497 | write_unlock(&neigh->lock); |
b820bb6b | 498 | } |
2152caea YH |
499 | |
500 | target = (struct in6_addr *)&rt->rt6i_gateway; | |
27097255 | 501 | addrconf_addr_solict_mult(target, &mcaddr); |
d1918542 | 502 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 503 | } else { |
2152caea YH |
504 | out: |
505 | write_unlock(&neigh->lock); | |
f2c31e32 | 506 | } |
2152caea | 507 | rcu_read_unlock_bh(); |
27097255 YH |
508 | } |
509 | #else | |
510 | static inline void rt6_probe(struct rt6_info *rt) | |
511 | { | |
27097255 YH |
512 | } |
513 | #endif | |
514 | ||
1da177e4 | 515 | /* |
554cfb7e | 516 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 517 | */ |
b6f99a21 | 518 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 519 | { |
d1918542 | 520 | struct net_device *dev = rt->dst.dev; |
161980f4 | 521 | if (!oif || dev->ifindex == oif) |
554cfb7e | 522 | return 2; |
161980f4 DM |
523 | if ((dev->flags & IFF_LOOPBACK) && |
524 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
525 | return 1; | |
526 | return 0; | |
554cfb7e | 527 | } |
1da177e4 | 528 | |
a5a81f0b | 529 | static inline bool rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 530 | { |
f2c31e32 | 531 | struct neighbour *neigh; |
a5a81f0b | 532 | bool ret = false; |
f2c31e32 | 533 | |
4d0c5911 YH |
534 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
535 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
145a3621 YH |
536 | return true; |
537 | ||
538 | rcu_read_lock_bh(); | |
539 | neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); | |
540 | if (neigh) { | |
541 | read_lock(&neigh->lock); | |
554cfb7e | 542 | if (neigh->nud_state & NUD_VALID) |
a5a81f0b | 543 | ret = true; |
398bcbeb | 544 | #ifdef CONFIG_IPV6_ROUTER_PREF |
a5a81f0b PM |
545 | else if (!(neigh->nud_state & NUD_FAILED)) |
546 | ret = true; | |
398bcbeb | 547 | #endif |
145a3621 | 548 | read_unlock(&neigh->lock); |
a5a81f0b | 549 | } |
145a3621 YH |
550 | rcu_read_unlock_bh(); |
551 | ||
a5a81f0b | 552 | return ret; |
1da177e4 LT |
553 | } |
554 | ||
554cfb7e YH |
555 | static int rt6_score_route(struct rt6_info *rt, int oif, |
556 | int strict) | |
1da177e4 | 557 | { |
a5a81f0b | 558 | int m; |
1ab1457c | 559 | |
4d0c5911 | 560 | m = rt6_check_dev(rt, oif); |
77d16f45 | 561 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 562 | return -1; |
ebacaaa0 YH |
563 | #ifdef CONFIG_IPV6_ROUTER_PREF |
564 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
565 | #endif | |
a5a81f0b | 566 | if (!rt6_check_neigh(rt) && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
567 | return -1; |
568 | return m; | |
569 | } | |
570 | ||
f11e6659 DM |
571 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
572 | int *mpri, struct rt6_info *match) | |
554cfb7e | 573 | { |
f11e6659 DM |
574 | int m; |
575 | ||
576 | if (rt6_check_expired(rt)) | |
577 | goto out; | |
578 | ||
579 | m = rt6_score_route(rt, oif, strict); | |
580 | if (m < 0) | |
581 | goto out; | |
582 | ||
583 | if (m > *mpri) { | |
584 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
585 | rt6_probe(match); | |
586 | *mpri = m; | |
587 | match = rt; | |
588 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
589 | rt6_probe(rt); | |
590 | } | |
591 | ||
592 | out: | |
593 | return match; | |
594 | } | |
595 | ||
596 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
597 | struct rt6_info *rr_head, | |
598 | u32 metric, int oif, int strict) | |
599 | { | |
600 | struct rt6_info *rt, *match; | |
554cfb7e | 601 | int mpri = -1; |
1da177e4 | 602 | |
f11e6659 DM |
603 | match = NULL; |
604 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 605 | rt = rt->dst.rt6_next) |
f11e6659 DM |
606 | match = find_match(rt, oif, strict, &mpri, match); |
607 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 608 | rt = rt->dst.rt6_next) |
f11e6659 | 609 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 610 | |
f11e6659 DM |
611 | return match; |
612 | } | |
1da177e4 | 613 | |
f11e6659 DM |
614 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
615 | { | |
616 | struct rt6_info *match, *rt0; | |
8ed67789 | 617 | struct net *net; |
1da177e4 | 618 | |
f11e6659 DM |
619 | rt0 = fn->rr_ptr; |
620 | if (!rt0) | |
621 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 622 | |
f11e6659 | 623 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 624 | |
554cfb7e | 625 | if (!match && |
f11e6659 | 626 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 627 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 628 | |
554cfb7e | 629 | /* no entries matched; do round-robin */ |
f11e6659 DM |
630 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
631 | next = fn->leaf; | |
632 | ||
633 | if (next != rt0) | |
634 | fn->rr_ptr = next; | |
1da177e4 | 635 | } |
1da177e4 | 636 | |
d1918542 | 637 | net = dev_net(rt0->dst.dev); |
a02cec21 | 638 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
639 | } |
640 | ||
70ceb4f5 YH |
641 | #ifdef CONFIG_IPV6_ROUTE_INFO |
642 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 643 | const struct in6_addr *gwaddr) |
70ceb4f5 | 644 | { |
c346dca1 | 645 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
646 | struct route_info *rinfo = (struct route_info *) opt; |
647 | struct in6_addr prefix_buf, *prefix; | |
648 | unsigned int pref; | |
4bed72e4 | 649 | unsigned long lifetime; |
70ceb4f5 YH |
650 | struct rt6_info *rt; |
651 | ||
652 | if (len < sizeof(struct route_info)) { | |
653 | return -EINVAL; | |
654 | } | |
655 | ||
656 | /* Sanity check for prefix_len and length */ | |
657 | if (rinfo->length > 3) { | |
658 | return -EINVAL; | |
659 | } else if (rinfo->prefix_len > 128) { | |
660 | return -EINVAL; | |
661 | } else if (rinfo->prefix_len > 64) { | |
662 | if (rinfo->length < 2) { | |
663 | return -EINVAL; | |
664 | } | |
665 | } else if (rinfo->prefix_len > 0) { | |
666 | if (rinfo->length < 1) { | |
667 | return -EINVAL; | |
668 | } | |
669 | } | |
670 | ||
671 | pref = rinfo->route_pref; | |
672 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 673 | return -EINVAL; |
70ceb4f5 | 674 | |
4bed72e4 | 675 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
676 | |
677 | if (rinfo->length == 3) | |
678 | prefix = (struct in6_addr *)rinfo->prefix; | |
679 | else { | |
680 | /* this function is safe */ | |
681 | ipv6_addr_prefix(&prefix_buf, | |
682 | (struct in6_addr *)rinfo->prefix, | |
683 | rinfo->prefix_len); | |
684 | prefix = &prefix_buf; | |
685 | } | |
686 | ||
efa2cea0 DL |
687 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
688 | dev->ifindex); | |
70ceb4f5 YH |
689 | |
690 | if (rt && !lifetime) { | |
e0a1ad73 | 691 | ip6_del_rt(rt); |
70ceb4f5 YH |
692 | rt = NULL; |
693 | } | |
694 | ||
695 | if (!rt && lifetime) | |
efa2cea0 | 696 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
697 | pref); |
698 | else if (rt) | |
699 | rt->rt6i_flags = RTF_ROUTEINFO | | |
700 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
701 | ||
702 | if (rt) { | |
1716a961 G |
703 | if (!addrconf_finite_timeout(lifetime)) |
704 | rt6_clean_expires(rt); | |
705 | else | |
706 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
707 | ||
94e187c0 | 708 | ip6_rt_put(rt); |
70ceb4f5 YH |
709 | } |
710 | return 0; | |
711 | } | |
712 | #endif | |
713 | ||
8ed67789 | 714 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 715 | do { \ |
8ed67789 | 716 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 717 | struct fib6_node *pn; \ |
e0eda7bb | 718 | while (1) { \ |
982f56f3 YH |
719 | if (fn->fn_flags & RTN_TL_ROOT) \ |
720 | goto out; \ | |
721 | pn = fn->parent; \ | |
722 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 723 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
724 | else \ |
725 | fn = pn; \ | |
726 | if (fn->fn_flags & RTN_RTINFO) \ | |
727 | goto restart; \ | |
c71099ac | 728 | } \ |
c71099ac | 729 | } \ |
38308473 | 730 | } while (0) |
c71099ac | 731 | |
8ed67789 DL |
732 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
733 | struct fib6_table *table, | |
4c9483b2 | 734 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
735 | { |
736 | struct fib6_node *fn; | |
737 | struct rt6_info *rt; | |
738 | ||
c71099ac | 739 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 740 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
741 | restart: |
742 | rt = fn->leaf; | |
4c9483b2 | 743 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
51ebd318 ND |
744 | if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) |
745 | rt = rt6_multipath_select(rt, fl6); | |
4c9483b2 | 746 | BACKTRACK(net, &fl6->saddr); |
c71099ac | 747 | out: |
d8d1f30b | 748 | dst_use(&rt->dst, jiffies); |
c71099ac | 749 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
750 | return rt; |
751 | ||
752 | } | |
753 | ||
ea6e574e FW |
754 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
755 | int flags) | |
756 | { | |
757 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
758 | } | |
759 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
760 | ||
9acd9f3a YH |
761 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
762 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 763 | { |
4c9483b2 DM |
764 | struct flowi6 fl6 = { |
765 | .flowi6_oif = oif, | |
766 | .daddr = *daddr, | |
c71099ac TG |
767 | }; |
768 | struct dst_entry *dst; | |
77d16f45 | 769 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 770 | |
adaa70bb | 771 | if (saddr) { |
4c9483b2 | 772 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
773 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
774 | } | |
775 | ||
4c9483b2 | 776 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
777 | if (dst->error == 0) |
778 | return (struct rt6_info *) dst; | |
779 | ||
780 | dst_release(dst); | |
781 | ||
1da177e4 LT |
782 | return NULL; |
783 | } | |
784 | ||
7159039a YH |
785 | EXPORT_SYMBOL(rt6_lookup); |
786 | ||
c71099ac | 787 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
788 | It takes new route entry, the addition fails by any reason the |
789 | route is freed. In any case, if caller does not hold it, it may | |
790 | be destroyed. | |
791 | */ | |
792 | ||
86872cb5 | 793 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
794 | { |
795 | int err; | |
c71099ac | 796 | struct fib6_table *table; |
1da177e4 | 797 | |
c71099ac TG |
798 | table = rt->rt6i_table; |
799 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 800 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 801 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
802 | |
803 | return err; | |
804 | } | |
805 | ||
40e22e8f TG |
806 | int ip6_ins_rt(struct rt6_info *rt) |
807 | { | |
4d1169c1 | 808 | struct nl_info info = { |
d1918542 | 809 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 810 | }; |
528c4ceb | 811 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
812 | } |
813 | ||
1716a961 | 814 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 815 | const struct in6_addr *daddr, |
b71d1d42 | 816 | const struct in6_addr *saddr) |
1da177e4 | 817 | { |
1da177e4 LT |
818 | struct rt6_info *rt; |
819 | ||
820 | /* | |
821 | * Clone the route. | |
822 | */ | |
823 | ||
21efcfa0 | 824 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
825 | |
826 | if (rt) { | |
38308473 | 827 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 828 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 829 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 830 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 831 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 832 | } |
1da177e4 | 833 | |
1da177e4 | 834 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
835 | |
836 | #ifdef CONFIG_IPV6_SUBTREES | |
837 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 838 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
839 | rt->rt6i_src.plen = 128; |
840 | } | |
841 | #endif | |
95a9a5ba | 842 | } |
1da177e4 | 843 | |
95a9a5ba YH |
844 | return rt; |
845 | } | |
1da177e4 | 846 | |
21efcfa0 ED |
847 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
848 | const struct in6_addr *daddr) | |
299d9939 | 849 | { |
21efcfa0 ED |
850 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
851 | ||
887c95cc | 852 | if (rt) |
299d9939 | 853 | rt->rt6i_flags |= RTF_CACHE; |
299d9939 YH |
854 | return rt; |
855 | } | |
856 | ||
8ed67789 | 857 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 858 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
859 | { |
860 | struct fib6_node *fn; | |
519fbd87 | 861 | struct rt6_info *rt, *nrt; |
c71099ac | 862 | int strict = 0; |
1da177e4 | 863 | int attempts = 3; |
519fbd87 | 864 | int err; |
53b7997f | 865 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 866 | |
77d16f45 | 867 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
868 | |
869 | relookup: | |
c71099ac | 870 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 871 | |
8238dd06 | 872 | restart_2: |
4c9483b2 | 873 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
874 | |
875 | restart: | |
4acad72d | 876 | rt = rt6_select(fn, oif, strict | reachable); |
51ebd318 ND |
877 | if (rt->rt6i_nsiblings && oif == 0) |
878 | rt = rt6_multipath_select(rt, fl6); | |
4c9483b2 | 879 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 880 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 881 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 882 | goto out; |
1da177e4 | 883 | |
d8d1f30b | 884 | dst_hold(&rt->dst); |
c71099ac | 885 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 886 | |
c440f160 | 887 | if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) |
4c9483b2 | 888 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 889 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 890 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
891 | else |
892 | goto out2; | |
e40cf353 | 893 | |
94e187c0 | 894 | ip6_rt_put(rt); |
8ed67789 | 895 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 896 | |
d8d1f30b | 897 | dst_hold(&rt->dst); |
519fbd87 | 898 | if (nrt) { |
40e22e8f | 899 | err = ip6_ins_rt(nrt); |
519fbd87 | 900 | if (!err) |
1da177e4 | 901 | goto out2; |
1da177e4 | 902 | } |
1da177e4 | 903 | |
519fbd87 YH |
904 | if (--attempts <= 0) |
905 | goto out2; | |
906 | ||
907 | /* | |
c71099ac | 908 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
909 | * released someone could insert this route. Relookup. |
910 | */ | |
94e187c0 | 911 | ip6_rt_put(rt); |
519fbd87 YH |
912 | goto relookup; |
913 | ||
914 | out: | |
8238dd06 YH |
915 | if (reachable) { |
916 | reachable = 0; | |
917 | goto restart_2; | |
918 | } | |
d8d1f30b | 919 | dst_hold(&rt->dst); |
c71099ac | 920 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 921 | out2: |
d8d1f30b CG |
922 | rt->dst.lastuse = jiffies; |
923 | rt->dst.__use++; | |
c71099ac TG |
924 | |
925 | return rt; | |
1da177e4 LT |
926 | } |
927 | ||
8ed67789 | 928 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 929 | struct flowi6 *fl6, int flags) |
4acad72d | 930 | { |
4c9483b2 | 931 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
932 | } |
933 | ||
72331bc0 SL |
934 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
935 | struct net_device *dev, | |
936 | struct flowi6 *fl6, int flags) | |
937 | { | |
938 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
939 | flags |= RT6_LOOKUP_F_IFACE; | |
940 | ||
941 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
942 | } | |
943 | ||
c71099ac TG |
944 | void ip6_route_input(struct sk_buff *skb) |
945 | { | |
b71d1d42 | 946 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 947 | struct net *net = dev_net(skb->dev); |
adaa70bb | 948 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
949 | struct flowi6 fl6 = { |
950 | .flowi6_iif = skb->dev->ifindex, | |
951 | .daddr = iph->daddr, | |
952 | .saddr = iph->saddr, | |
6502ca52 | 953 | .flowlabel = ip6_flowinfo(iph), |
4c9483b2 DM |
954 | .flowi6_mark = skb->mark, |
955 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 956 | }; |
adaa70bb | 957 | |
72331bc0 | 958 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
959 | } |
960 | ||
8ed67789 | 961 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 962 | struct flowi6 *fl6, int flags) |
1da177e4 | 963 | { |
4c9483b2 | 964 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
965 | } |
966 | ||
9c7a4f9c | 967 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 968 | struct flowi6 *fl6) |
c71099ac TG |
969 | { |
970 | int flags = 0; | |
971 | ||
1fb9489b | 972 | fl6->flowi6_iif = LOOPBACK_IFINDEX; |
4dc27d1c | 973 | |
4c9483b2 | 974 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 975 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 976 | |
4c9483b2 | 977 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 978 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
979 | else if (sk) |
980 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 981 | |
4c9483b2 | 982 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
983 | } |
984 | ||
7159039a | 985 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 986 | |
2774c131 | 987 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 988 | { |
5c1e6aa3 | 989 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
990 | struct dst_entry *new = NULL; |
991 | ||
f5b0a874 | 992 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); |
14e50e57 | 993 | if (rt) { |
d8d1f30b | 994 | new = &rt->dst; |
14e50e57 | 995 | |
8104891b SK |
996 | memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); |
997 | rt6_init_peer(rt, net->ipv6.peers); | |
998 | ||
14e50e57 | 999 | new->__use = 1; |
352e512c HX |
1000 | new->input = dst_discard; |
1001 | new->output = dst_discard; | |
14e50e57 | 1002 | |
21efcfa0 ED |
1003 | if (dst_metrics_read_only(&ort->dst)) |
1004 | new->_metrics = ort->dst._metrics; | |
1005 | else | |
1006 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
1007 | rt->rt6i_idev = ort->rt6i_idev; |
1008 | if (rt->rt6i_idev) | |
1009 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 1010 | |
4e3fd7a0 | 1011 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1012 | rt->rt6i_flags = ort->rt6i_flags; |
1013 | rt6_clean_expires(rt); | |
14e50e57 DM |
1014 | rt->rt6i_metric = 0; |
1015 | ||
1016 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1017 | #ifdef CONFIG_IPV6_SUBTREES | |
1018 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1019 | #endif | |
1020 | ||
1021 | dst_free(new); | |
1022 | } | |
1023 | ||
69ead7af DM |
1024 | dst_release(dst_orig); |
1025 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 1026 | } |
14e50e57 | 1027 | |
1da177e4 LT |
1028 | /* |
1029 | * Destination cache support functions | |
1030 | */ | |
1031 | ||
1032 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
1033 | { | |
1034 | struct rt6_info *rt; | |
1035 | ||
1036 | rt = (struct rt6_info *) dst; | |
1037 | ||
6f3118b5 ND |
1038 | /* All IPV6 dsts are created with ->obsolete set to the value |
1039 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1040 | * into this function always. | |
1041 | */ | |
1042 | if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev))) | |
1043 | return NULL; | |
1044 | ||
a4477c4d | 1045 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
1da177e4 | 1046 | return dst; |
a4477c4d | 1047 | |
1da177e4 LT |
1048 | return NULL; |
1049 | } | |
1050 | ||
1051 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1052 | { | |
1053 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1054 | ||
1055 | if (rt) { | |
54c1a859 YH |
1056 | if (rt->rt6i_flags & RTF_CACHE) { |
1057 | if (rt6_check_expired(rt)) { | |
1058 | ip6_del_rt(rt); | |
1059 | dst = NULL; | |
1060 | } | |
1061 | } else { | |
1da177e4 | 1062 | dst_release(dst); |
54c1a859 YH |
1063 | dst = NULL; |
1064 | } | |
1da177e4 | 1065 | } |
54c1a859 | 1066 | return dst; |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | static void ip6_link_failure(struct sk_buff *skb) | |
1070 | { | |
1071 | struct rt6_info *rt; | |
1072 | ||
3ffe533c | 1073 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1074 | |
adf30907 | 1075 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1076 | if (rt) { |
1716a961 G |
1077 | if (rt->rt6i_flags & RTF_CACHE) |
1078 | rt6_update_expires(rt, 0); | |
1079 | else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1da177e4 LT |
1080 | rt->rt6i_node->fn_sernum = -1; |
1081 | } | |
1082 | } | |
1083 | ||
6700c270 DM |
1084 | static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
1085 | struct sk_buff *skb, u32 mtu) | |
1da177e4 LT |
1086 | { |
1087 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1088 | ||
81aded24 | 1089 | dst_confirm(dst); |
1da177e4 | 1090 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
81aded24 DM |
1091 | struct net *net = dev_net(dst->dev); |
1092 | ||
1da177e4 LT |
1093 | rt6->rt6i_flags |= RTF_MODIFIED; |
1094 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1095 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1096 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1097 | features |= RTAX_FEATURE_ALLFRAG; |
1098 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1099 | } |
defb3519 | 1100 | dst_metric_set(dst, RTAX_MTU, mtu); |
81aded24 | 1101 | rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1102 | } |
1103 | } | |
1104 | ||
42ae66c8 DM |
1105 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, |
1106 | int oif, u32 mark) | |
81aded24 DM |
1107 | { |
1108 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1109 | struct dst_entry *dst; | |
1110 | struct flowi6 fl6; | |
1111 | ||
1112 | memset(&fl6, 0, sizeof(fl6)); | |
1113 | fl6.flowi6_oif = oif; | |
1114 | fl6.flowi6_mark = mark; | |
3e12939a | 1115 | fl6.flowi6_flags = 0; |
81aded24 DM |
1116 | fl6.daddr = iph->daddr; |
1117 | fl6.saddr = iph->saddr; | |
6502ca52 | 1118 | fl6.flowlabel = ip6_flowinfo(iph); |
81aded24 DM |
1119 | |
1120 | dst = ip6_route_output(net, NULL, &fl6); | |
1121 | if (!dst->error) | |
6700c270 | 1122 | ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); |
81aded24 DM |
1123 | dst_release(dst); |
1124 | } | |
1125 | EXPORT_SYMBOL_GPL(ip6_update_pmtu); | |
1126 | ||
1127 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) | |
1128 | { | |
1129 | ip6_update_pmtu(skb, sock_net(sk), mtu, | |
1130 | sk->sk_bound_dev_if, sk->sk_mark); | |
1131 | } | |
1132 | EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); | |
1133 | ||
3a5ad2ee DM |
1134 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) |
1135 | { | |
1136 | const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; | |
1137 | struct dst_entry *dst; | |
1138 | struct flowi6 fl6; | |
1139 | ||
1140 | memset(&fl6, 0, sizeof(fl6)); | |
1141 | fl6.flowi6_oif = oif; | |
1142 | fl6.flowi6_mark = mark; | |
1143 | fl6.flowi6_flags = 0; | |
1144 | fl6.daddr = iph->daddr; | |
1145 | fl6.saddr = iph->saddr; | |
6502ca52 | 1146 | fl6.flowlabel = ip6_flowinfo(iph); |
3a5ad2ee DM |
1147 | |
1148 | dst = ip6_route_output(net, NULL, &fl6); | |
1149 | if (!dst->error) | |
6700c270 | 1150 | rt6_do_redirect(dst, NULL, skb); |
3a5ad2ee DM |
1151 | dst_release(dst); |
1152 | } | |
1153 | EXPORT_SYMBOL_GPL(ip6_redirect); | |
1154 | ||
1155 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1156 | { | |
1157 | ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); | |
1158 | } | |
1159 | EXPORT_SYMBOL_GPL(ip6_sk_redirect); | |
1160 | ||
0dbaee3b | 1161 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1162 | { |
0dbaee3b DM |
1163 | struct net_device *dev = dst->dev; |
1164 | unsigned int mtu = dst_mtu(dst); | |
1165 | struct net *net = dev_net(dev); | |
1166 | ||
1da177e4 LT |
1167 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1168 | ||
5578689a DL |
1169 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1170 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1171 | |
1172 | /* | |
1ab1457c YH |
1173 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1174 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1175 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1176 | * rely only on pmtu discovery" |
1177 | */ | |
1178 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1179 | mtu = IPV6_MAXPLEN; | |
1180 | return mtu; | |
1181 | } | |
1182 | ||
ebb762f2 | 1183 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1184 | { |
d33e4553 | 1185 | struct inet6_dev *idev; |
618f9bc7 SK |
1186 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1187 | ||
1188 | if (mtu) | |
1189 | return mtu; | |
1190 | ||
1191 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1192 | |
1193 | rcu_read_lock(); | |
1194 | idev = __in6_dev_get(dst->dev); | |
1195 | if (idev) | |
1196 | mtu = idev->cnf.mtu6; | |
1197 | rcu_read_unlock(); | |
1198 | ||
1199 | return mtu; | |
1200 | } | |
1201 | ||
3b00944c YH |
1202 | static struct dst_entry *icmp6_dst_gc_list; |
1203 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1204 | |
3b00944c | 1205 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
87a11578 | 1206 | struct flowi6 *fl6) |
1da177e4 | 1207 | { |
87a11578 | 1208 | struct dst_entry *dst; |
1da177e4 LT |
1209 | struct rt6_info *rt; |
1210 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1211 | struct net *net = dev_net(dev); |
1da177e4 | 1212 | |
38308473 | 1213 | if (unlikely(!idev)) |
122bdf67 | 1214 | return ERR_PTR(-ENODEV); |
1da177e4 | 1215 | |
8b96d22d | 1216 | rt = ip6_dst_alloc(net, dev, 0, NULL); |
38308473 | 1217 | if (unlikely(!rt)) { |
1da177e4 | 1218 | in6_dev_put(idev); |
87a11578 | 1219 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1220 | goto out; |
1221 | } | |
1222 | ||
8e2ec639 YZ |
1223 | rt->dst.flags |= DST_HOST; |
1224 | rt->dst.output = ip6_output; | |
d8d1f30b | 1225 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1226 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1227 | rt->rt6i_dst.plen = 128; |
1228 | rt->rt6i_idev = idev; | |
14edd87d | 1229 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); |
1da177e4 | 1230 | |
3b00944c | 1231 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1232 | rt->dst.next = icmp6_dst_gc_list; |
1233 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1234 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1235 | |
5578689a | 1236 | fib6_force_start_gc(net); |
1da177e4 | 1237 | |
87a11578 DM |
1238 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1239 | ||
1da177e4 | 1240 | out: |
87a11578 | 1241 | return dst; |
1da177e4 LT |
1242 | } |
1243 | ||
3d0f24a7 | 1244 | int icmp6_dst_gc(void) |
1da177e4 | 1245 | { |
e9476e95 | 1246 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1247 | int more = 0; |
1da177e4 | 1248 | |
3b00944c YH |
1249 | spin_lock_bh(&icmp6_dst_lock); |
1250 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1251 | |
1da177e4 LT |
1252 | while ((dst = *pprev) != NULL) { |
1253 | if (!atomic_read(&dst->__refcnt)) { | |
1254 | *pprev = dst->next; | |
1255 | dst_free(dst); | |
1da177e4 LT |
1256 | } else { |
1257 | pprev = &dst->next; | |
3d0f24a7 | 1258 | ++more; |
1da177e4 LT |
1259 | } |
1260 | } | |
1261 | ||
3b00944c | 1262 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1263 | |
3d0f24a7 | 1264 | return more; |
1da177e4 LT |
1265 | } |
1266 | ||
1e493d19 DM |
1267 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1268 | void *arg) | |
1269 | { | |
1270 | struct dst_entry *dst, **pprev; | |
1271 | ||
1272 | spin_lock_bh(&icmp6_dst_lock); | |
1273 | pprev = &icmp6_dst_gc_list; | |
1274 | while ((dst = *pprev) != NULL) { | |
1275 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1276 | if (func(rt, arg)) { | |
1277 | *pprev = dst->next; | |
1278 | dst_free(dst); | |
1279 | } else { | |
1280 | pprev = &dst->next; | |
1281 | } | |
1282 | } | |
1283 | spin_unlock_bh(&icmp6_dst_lock); | |
1284 | } | |
1285 | ||
569d3645 | 1286 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1287 | { |
1da177e4 | 1288 | unsigned long now = jiffies; |
86393e52 | 1289 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1290 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1291 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1292 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1293 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1294 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1295 | int entries; |
7019b78e | 1296 | |
fc66f95c | 1297 | entries = dst_entries_get_fast(ops); |
7019b78e | 1298 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1299 | entries <= rt_max_size) |
1da177e4 LT |
1300 | goto out; |
1301 | ||
6891a346 BT |
1302 | net->ipv6.ip6_rt_gc_expire++; |
1303 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1304 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1305 | entries = dst_entries_get_slow(ops); |
1306 | if (entries < ops->gc_thresh) | |
7019b78e | 1307 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1308 | out: |
7019b78e | 1309 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1310 | return entries > rt_max_size; |
1da177e4 LT |
1311 | } |
1312 | ||
6b75d090 | 1313 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1314 | { |
5170ae82 | 1315 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1316 | if (hoplimit == 0) { |
6b75d090 | 1317 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1318 | struct inet6_dev *idev; |
1319 | ||
1320 | rcu_read_lock(); | |
1321 | idev = __in6_dev_get(dev); | |
1322 | if (idev) | |
6b75d090 | 1323 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1324 | else |
53b7997f | 1325 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1326 | rcu_read_unlock(); |
1da177e4 LT |
1327 | } |
1328 | return hoplimit; | |
1329 | } | |
abbf46ae | 1330 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1331 | |
1332 | /* | |
1333 | * | |
1334 | */ | |
1335 | ||
86872cb5 | 1336 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1337 | { |
1338 | int err; | |
5578689a | 1339 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1340 | struct rt6_info *rt = NULL; |
1341 | struct net_device *dev = NULL; | |
1342 | struct inet6_dev *idev = NULL; | |
c71099ac | 1343 | struct fib6_table *table; |
1da177e4 LT |
1344 | int addr_type; |
1345 | ||
86872cb5 | 1346 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1347 | return -EINVAL; |
1348 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1349 | if (cfg->fc_src_len) |
1da177e4 LT |
1350 | return -EINVAL; |
1351 | #endif | |
86872cb5 | 1352 | if (cfg->fc_ifindex) { |
1da177e4 | 1353 | err = -ENODEV; |
5578689a | 1354 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1355 | if (!dev) |
1356 | goto out; | |
1357 | idev = in6_dev_get(dev); | |
1358 | if (!idev) | |
1359 | goto out; | |
1360 | } | |
1361 | ||
86872cb5 TG |
1362 | if (cfg->fc_metric == 0) |
1363 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1364 | |
d71314b4 | 1365 | err = -ENOBUFS; |
38308473 DM |
1366 | if (cfg->fc_nlinfo.nlh && |
1367 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1368 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1369 | if (!table) { |
f3213831 | 1370 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1371 | table = fib6_new_table(net, cfg->fc_table); |
1372 | } | |
1373 | } else { | |
1374 | table = fib6_new_table(net, cfg->fc_table); | |
1375 | } | |
38308473 DM |
1376 | |
1377 | if (!table) | |
c71099ac | 1378 | goto out; |
c71099ac | 1379 | |
8b96d22d | 1380 | rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table); |
1da177e4 | 1381 | |
38308473 | 1382 | if (!rt) { |
1da177e4 LT |
1383 | err = -ENOMEM; |
1384 | goto out; | |
1385 | } | |
1386 | ||
1716a961 G |
1387 | if (cfg->fc_flags & RTF_EXPIRES) |
1388 | rt6_set_expires(rt, jiffies + | |
1389 | clock_t_to_jiffies(cfg->fc_expires)); | |
1390 | else | |
1391 | rt6_clean_expires(rt); | |
1da177e4 | 1392 | |
86872cb5 TG |
1393 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1394 | cfg->fc_protocol = RTPROT_BOOT; | |
1395 | rt->rt6i_protocol = cfg->fc_protocol; | |
1396 | ||
1397 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1398 | |
1399 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1400 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1401 | else if (cfg->fc_flags & RTF_LOCAL) |
1402 | rt->dst.input = ip6_input; | |
1da177e4 | 1403 | else |
d8d1f30b | 1404 | rt->dst.input = ip6_forward; |
1da177e4 | 1405 | |
d8d1f30b | 1406 | rt->dst.output = ip6_output; |
1da177e4 | 1407 | |
86872cb5 TG |
1408 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1409 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1410 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1411 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1412 | |
8e2ec639 YZ |
1413 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1414 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1415 | if (!metrics) { | |
1416 | err = -ENOMEM; | |
1417 | goto out; | |
1418 | } | |
1419 | dst_init_metrics(&rt->dst, metrics, 0); | |
1420 | } | |
1da177e4 | 1421 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1422 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1423 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1424 | #endif |
1425 | ||
86872cb5 | 1426 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1427 | |
1428 | /* We cannot add true routes via loopback here, | |
1429 | they would result in kernel looping; promote them to reject routes | |
1430 | */ | |
86872cb5 | 1431 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1432 | (dev && (dev->flags & IFF_LOOPBACK) && |
1433 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1434 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1435 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1436 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1437 | if (dev) { |
1438 | dev_put(dev); | |
1439 | in6_dev_put(idev); | |
1440 | } | |
5578689a | 1441 | dev = net->loopback_dev; |
1da177e4 LT |
1442 | dev_hold(dev); |
1443 | idev = in6_dev_get(dev); | |
1444 | if (!idev) { | |
1445 | err = -ENODEV; | |
1446 | goto out; | |
1447 | } | |
1448 | } | |
d8d1f30b CG |
1449 | rt->dst.output = ip6_pkt_discard_out; |
1450 | rt->dst.input = ip6_pkt_discard; | |
1da177e4 | 1451 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
ef2c7d7b ND |
1452 | switch (cfg->fc_type) { |
1453 | case RTN_BLACKHOLE: | |
1454 | rt->dst.error = -EINVAL; | |
1455 | break; | |
1456 | case RTN_PROHIBIT: | |
1457 | rt->dst.error = -EACCES; | |
1458 | break; | |
b4949ab2 ND |
1459 | case RTN_THROW: |
1460 | rt->dst.error = -EAGAIN; | |
1461 | break; | |
ef2c7d7b ND |
1462 | default: |
1463 | rt->dst.error = -ENETUNREACH; | |
1464 | break; | |
1465 | } | |
1da177e4 LT |
1466 | goto install_route; |
1467 | } | |
1468 | ||
86872cb5 | 1469 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1470 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1471 | int gwa_type; |
1472 | ||
86872cb5 | 1473 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1474 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1475 | gwa_type = ipv6_addr_type(gw_addr); |
1476 | ||
1477 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1478 | struct rt6_info *grt; | |
1479 | ||
1480 | /* IPv6 strictly inhibits using not link-local | |
1481 | addresses as nexthop address. | |
1482 | Otherwise, router will not able to send redirects. | |
1483 | It is very good, but in some (rare!) circumstances | |
1484 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1485 | some exceptions. --ANK | |
1486 | */ | |
1487 | err = -EINVAL; | |
38308473 | 1488 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1489 | goto out; |
1490 | ||
5578689a | 1491 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1492 | |
1493 | err = -EHOSTUNREACH; | |
38308473 | 1494 | if (!grt) |
1da177e4 LT |
1495 | goto out; |
1496 | if (dev) { | |
d1918542 | 1497 | if (dev != grt->dst.dev) { |
94e187c0 | 1498 | ip6_rt_put(grt); |
1da177e4 LT |
1499 | goto out; |
1500 | } | |
1501 | } else { | |
d1918542 | 1502 | dev = grt->dst.dev; |
1da177e4 LT |
1503 | idev = grt->rt6i_idev; |
1504 | dev_hold(dev); | |
1505 | in6_dev_hold(grt->rt6i_idev); | |
1506 | } | |
38308473 | 1507 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1508 | err = 0; |
94e187c0 | 1509 | ip6_rt_put(grt); |
1da177e4 LT |
1510 | |
1511 | if (err) | |
1512 | goto out; | |
1513 | } | |
1514 | err = -EINVAL; | |
38308473 | 1515 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1516 | goto out; |
1517 | } | |
1518 | ||
1519 | err = -ENODEV; | |
38308473 | 1520 | if (!dev) |
1da177e4 LT |
1521 | goto out; |
1522 | ||
c3968a85 DW |
1523 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1524 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1525 | err = -EINVAL; | |
1526 | goto out; | |
1527 | } | |
4e3fd7a0 | 1528 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1529 | rt->rt6i_prefsrc.plen = 128; |
1530 | } else | |
1531 | rt->rt6i_prefsrc.plen = 0; | |
1532 | ||
86872cb5 | 1533 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1534 | |
1535 | install_route: | |
86872cb5 TG |
1536 | if (cfg->fc_mx) { |
1537 | struct nlattr *nla; | |
1538 | int remaining; | |
1539 | ||
1540 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1541 | int type = nla_type(nla); |
86872cb5 TG |
1542 | |
1543 | if (type) { | |
1544 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1545 | err = -EINVAL; |
1546 | goto out; | |
1547 | } | |
86872cb5 | 1548 | |
defb3519 | 1549 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1550 | } |
1da177e4 LT |
1551 | } |
1552 | } | |
1553 | ||
d8d1f30b | 1554 | rt->dst.dev = dev; |
1da177e4 | 1555 | rt->rt6i_idev = idev; |
c71099ac | 1556 | rt->rt6i_table = table; |
63152fc0 | 1557 | |
c346dca1 | 1558 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1559 | |
86872cb5 | 1560 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1561 | |
1562 | out: | |
1563 | if (dev) | |
1564 | dev_put(dev); | |
1565 | if (idev) | |
1566 | in6_dev_put(idev); | |
1567 | if (rt) | |
d8d1f30b | 1568 | dst_free(&rt->dst); |
1da177e4 LT |
1569 | return err; |
1570 | } | |
1571 | ||
86872cb5 | 1572 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1573 | { |
1574 | int err; | |
c71099ac | 1575 | struct fib6_table *table; |
d1918542 | 1576 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1577 | |
6825a26c G |
1578 | if (rt == net->ipv6.ip6_null_entry) { |
1579 | err = -ENOENT; | |
1580 | goto out; | |
1581 | } | |
6c813a72 | 1582 | |
c71099ac TG |
1583 | table = rt->rt6i_table; |
1584 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 1585 | err = fib6_del(rt, info); |
c71099ac | 1586 | write_unlock_bh(&table->tb6_lock); |
1da177e4 | 1587 | |
6825a26c | 1588 | out: |
94e187c0 | 1589 | ip6_rt_put(rt); |
1da177e4 LT |
1590 | return err; |
1591 | } | |
1592 | ||
e0a1ad73 TG |
1593 | int ip6_del_rt(struct rt6_info *rt) |
1594 | { | |
4d1169c1 | 1595 | struct nl_info info = { |
d1918542 | 1596 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1597 | }; |
528c4ceb | 1598 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1599 | } |
1600 | ||
86872cb5 | 1601 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1602 | { |
c71099ac | 1603 | struct fib6_table *table; |
1da177e4 LT |
1604 | struct fib6_node *fn; |
1605 | struct rt6_info *rt; | |
1606 | int err = -ESRCH; | |
1607 | ||
5578689a | 1608 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1609 | if (!table) |
c71099ac TG |
1610 | return err; |
1611 | ||
1612 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1613 | |
c71099ac | 1614 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1615 | &cfg->fc_dst, cfg->fc_dst_len, |
1616 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1617 | |
1da177e4 | 1618 | if (fn) { |
d8d1f30b | 1619 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1620 | if (cfg->fc_ifindex && |
d1918542 DM |
1621 | (!rt->dst.dev || |
1622 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1623 | continue; |
86872cb5 TG |
1624 | if (cfg->fc_flags & RTF_GATEWAY && |
1625 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1626 | continue; |
86872cb5 | 1627 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1628 | continue; |
d8d1f30b | 1629 | dst_hold(&rt->dst); |
c71099ac | 1630 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1631 | |
86872cb5 | 1632 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1633 | } |
1634 | } | |
c71099ac | 1635 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1636 | |
1637 | return err; | |
1638 | } | |
1639 | ||
6700c270 | 1640 | static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
a6279458 | 1641 | { |
e8599ff4 | 1642 | struct net *net = dev_net(skb->dev); |
a6279458 | 1643 | struct netevent_redirect netevent; |
e8599ff4 | 1644 | struct rt6_info *rt, *nrt = NULL; |
e8599ff4 DM |
1645 | struct ndisc_options ndopts; |
1646 | struct inet6_dev *in6_dev; | |
1647 | struct neighbour *neigh; | |
71bcdba0 | 1648 | struct rd_msg *msg; |
6e157b6a DM |
1649 | int optlen, on_link; |
1650 | u8 *lladdr; | |
e8599ff4 DM |
1651 | |
1652 | optlen = skb->tail - skb->transport_header; | |
71bcdba0 | 1653 | optlen -= sizeof(*msg); |
e8599ff4 DM |
1654 | |
1655 | if (optlen < 0) { | |
6e157b6a | 1656 | net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); |
e8599ff4 DM |
1657 | return; |
1658 | } | |
1659 | ||
71bcdba0 | 1660 | msg = (struct rd_msg *)icmp6_hdr(skb); |
e8599ff4 | 1661 | |
71bcdba0 | 1662 | if (ipv6_addr_is_multicast(&msg->dest)) { |
6e157b6a | 1663 | net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); |
e8599ff4 DM |
1664 | return; |
1665 | } | |
1666 | ||
6e157b6a | 1667 | on_link = 0; |
71bcdba0 | 1668 | if (ipv6_addr_equal(&msg->dest, &msg->target)) { |
e8599ff4 | 1669 | on_link = 1; |
71bcdba0 | 1670 | } else if (ipv6_addr_type(&msg->target) != |
e8599ff4 | 1671 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
6e157b6a | 1672 | net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); |
e8599ff4 DM |
1673 | return; |
1674 | } | |
1675 | ||
1676 | in6_dev = __in6_dev_get(skb->dev); | |
1677 | if (!in6_dev) | |
1678 | return; | |
1679 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) | |
1680 | return; | |
1681 | ||
1682 | /* RFC2461 8.1: | |
1683 | * The IP source address of the Redirect MUST be the same as the current | |
1684 | * first-hop router for the specified ICMP Destination Address. | |
1685 | */ | |
1686 | ||
71bcdba0 | 1687 | if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { |
e8599ff4 DM |
1688 | net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); |
1689 | return; | |
1690 | } | |
6e157b6a DM |
1691 | |
1692 | lladdr = NULL; | |
e8599ff4 DM |
1693 | if (ndopts.nd_opts_tgt_lladdr) { |
1694 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1695 | skb->dev); | |
1696 | if (!lladdr) { | |
1697 | net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); | |
1698 | return; | |
1699 | } | |
1700 | } | |
1701 | ||
6e157b6a DM |
1702 | rt = (struct rt6_info *) dst; |
1703 | if (rt == net->ipv6.ip6_null_entry) { | |
1704 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); | |
e8599ff4 | 1705 | return; |
6e157b6a | 1706 | } |
e8599ff4 | 1707 | |
6e157b6a DM |
1708 | /* Redirect received -> path was valid. |
1709 | * Look, redirects are sent only in response to data packets, | |
1710 | * so that this nexthop apparently is reachable. --ANK | |
1711 | */ | |
1712 | dst_confirm(&rt->dst); | |
a6279458 | 1713 | |
71bcdba0 | 1714 | neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); |
6e157b6a DM |
1715 | if (!neigh) |
1716 | return; | |
a6279458 | 1717 | |
1da177e4 LT |
1718 | /* |
1719 | * We have finally decided to accept it. | |
1720 | */ | |
1721 | ||
1ab1457c | 1722 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1723 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1724 | NEIGH_UPDATE_F_OVERRIDE| | |
1725 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1726 | NEIGH_UPDATE_F_ISROUTER)) | |
1727 | ); | |
1728 | ||
71bcdba0 | 1729 | nrt = ip6_rt_copy(rt, &msg->dest); |
38308473 | 1730 | if (!nrt) |
1da177e4 LT |
1731 | goto out; |
1732 | ||
1733 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1734 | if (on_link) | |
1735 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1736 | ||
4e3fd7a0 | 1737 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
1da177e4 | 1738 | |
40e22e8f | 1739 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1740 | goto out; |
1741 | ||
d8d1f30b CG |
1742 | netevent.old = &rt->dst; |
1743 | netevent.new = &nrt->dst; | |
71bcdba0 | 1744 | netevent.daddr = &msg->dest; |
60592833 | 1745 | netevent.neigh = neigh; |
8d71740c TT |
1746 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1747 | ||
38308473 | 1748 | if (rt->rt6i_flags & RTF_CACHE) { |
6e157b6a | 1749 | rt = (struct rt6_info *) dst_clone(&rt->dst); |
e0a1ad73 | 1750 | ip6_del_rt(rt); |
1da177e4 LT |
1751 | } |
1752 | ||
1753 | out: | |
e8599ff4 | 1754 | neigh_release(neigh); |
6e157b6a DM |
1755 | } |
1756 | ||
1da177e4 LT |
1757 | /* |
1758 | * Misc support functions | |
1759 | */ | |
1760 | ||
1716a961 | 1761 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1762 | const struct in6_addr *dest) |
1da177e4 | 1763 | { |
d1918542 | 1764 | struct net *net = dev_net(ort->dst.dev); |
8b96d22d DM |
1765 | struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, |
1766 | ort->rt6i_table); | |
1da177e4 LT |
1767 | |
1768 | if (rt) { | |
d8d1f30b CG |
1769 | rt->dst.input = ort->dst.input; |
1770 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1771 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1772 | |
4e3fd7a0 | 1773 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1774 | rt->rt6i_dst.plen = 128; |
defb3519 | 1775 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1776 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1777 | rt->rt6i_idev = ort->rt6i_idev; |
1778 | if (rt->rt6i_idev) | |
1779 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1780 | rt->dst.lastuse = jiffies; |
1da177e4 | 1781 | |
4e3fd7a0 | 1782 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1783 | rt->rt6i_flags = ort->rt6i_flags; |
1784 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == | |
1785 | (RTF_DEFAULT | RTF_ADDRCONF)) | |
1786 | rt6_set_from(rt, ort); | |
1787 | else | |
1788 | rt6_clean_expires(rt); | |
1da177e4 LT |
1789 | rt->rt6i_metric = 0; |
1790 | ||
1da177e4 LT |
1791 | #ifdef CONFIG_IPV6_SUBTREES |
1792 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1793 | #endif | |
0f6c6392 | 1794 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1795 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1796 | } |
1797 | return rt; | |
1798 | } | |
1799 | ||
70ceb4f5 | 1800 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1801 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1802 | const struct in6_addr *prefix, int prefixlen, |
1803 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1804 | { |
1805 | struct fib6_node *fn; | |
1806 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1807 | struct fib6_table *table; |
1808 | ||
efa2cea0 | 1809 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1810 | if (!table) |
c71099ac | 1811 | return NULL; |
70ceb4f5 | 1812 | |
5744dd9b | 1813 | read_lock_bh(&table->tb6_lock); |
c71099ac | 1814 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); |
70ceb4f5 YH |
1815 | if (!fn) |
1816 | goto out; | |
1817 | ||
d8d1f30b | 1818 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1819 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1820 | continue; |
1821 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1822 | continue; | |
1823 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1824 | continue; | |
d8d1f30b | 1825 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1826 | break; |
1827 | } | |
1828 | out: | |
5744dd9b | 1829 | read_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1830 | return rt; |
1831 | } | |
1832 | ||
efa2cea0 | 1833 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1834 | const struct in6_addr *prefix, int prefixlen, |
1835 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1836 | unsigned int pref) |
70ceb4f5 | 1837 | { |
86872cb5 TG |
1838 | struct fib6_config cfg = { |
1839 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1840 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1841 | .fc_ifindex = ifindex, |
1842 | .fc_dst_len = prefixlen, | |
1843 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1844 | RTF_UP | RTF_PREF(pref), | |
15e47304 | 1845 | .fc_nlinfo.portid = 0, |
efa2cea0 DL |
1846 | .fc_nlinfo.nlh = NULL, |
1847 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1848 | }; |
1849 | ||
4e3fd7a0 AD |
1850 | cfg.fc_dst = *prefix; |
1851 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1852 | |
e317da96 YH |
1853 | /* We should treat it as a default route if prefix length is 0. */ |
1854 | if (!prefixlen) | |
86872cb5 | 1855 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1856 | |
86872cb5 | 1857 | ip6_route_add(&cfg); |
70ceb4f5 | 1858 | |
efa2cea0 | 1859 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1860 | } |
1861 | #endif | |
1862 | ||
b71d1d42 | 1863 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1864 | { |
1da177e4 | 1865 | struct rt6_info *rt; |
c71099ac | 1866 | struct fib6_table *table; |
1da177e4 | 1867 | |
c346dca1 | 1868 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1869 | if (!table) |
c71099ac | 1870 | return NULL; |
1da177e4 | 1871 | |
5744dd9b | 1872 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1873 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1874 | if (dev == rt->dst.dev && |
045927ff | 1875 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1876 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1877 | break; | |
1878 | } | |
1879 | if (rt) | |
d8d1f30b | 1880 | dst_hold(&rt->dst); |
5744dd9b | 1881 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1882 | return rt; |
1883 | } | |
1884 | ||
b71d1d42 | 1885 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1886 | struct net_device *dev, |
1887 | unsigned int pref) | |
1da177e4 | 1888 | { |
86872cb5 TG |
1889 | struct fib6_config cfg = { |
1890 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1891 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1892 | .fc_ifindex = dev->ifindex, |
1893 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1894 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
15e47304 | 1895 | .fc_nlinfo.portid = 0, |
5578689a | 1896 | .fc_nlinfo.nlh = NULL, |
c346dca1 | 1897 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1898 | }; |
1da177e4 | 1899 | |
4e3fd7a0 | 1900 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1901 | |
86872cb5 | 1902 | ip6_route_add(&cfg); |
1da177e4 | 1903 | |
1da177e4 LT |
1904 | return rt6_get_dflt_router(gwaddr, dev); |
1905 | } | |
1906 | ||
7b4da532 | 1907 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1908 | { |
1909 | struct rt6_info *rt; | |
c71099ac TG |
1910 | struct fib6_table *table; |
1911 | ||
1912 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1913 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1914 | if (!table) |
c71099ac | 1915 | return; |
1da177e4 LT |
1916 | |
1917 | restart: | |
c71099ac | 1918 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1919 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1920 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1921 | dst_hold(&rt->dst); |
c71099ac | 1922 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1923 | ip6_del_rt(rt); |
1da177e4 LT |
1924 | goto restart; |
1925 | } | |
1926 | } | |
c71099ac | 1927 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1928 | } |
1929 | ||
5578689a DL |
1930 | static void rtmsg_to_fib6_config(struct net *net, |
1931 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1932 | struct fib6_config *cfg) |
1933 | { | |
1934 | memset(cfg, 0, sizeof(*cfg)); | |
1935 | ||
1936 | cfg->fc_table = RT6_TABLE_MAIN; | |
1937 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1938 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1939 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1940 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1941 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1942 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1943 | ||
5578689a | 1944 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1945 | |
4e3fd7a0 AD |
1946 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1947 | cfg->fc_src = rtmsg->rtmsg_src; | |
1948 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
1949 | } |
1950 | ||
5578689a | 1951 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1952 | { |
86872cb5 | 1953 | struct fib6_config cfg; |
1da177e4 LT |
1954 | struct in6_rtmsg rtmsg; |
1955 | int err; | |
1956 | ||
1957 | switch(cmd) { | |
1958 | case SIOCADDRT: /* Add a route */ | |
1959 | case SIOCDELRT: /* Delete a route */ | |
af31f412 | 1960 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
1da177e4 LT |
1961 | return -EPERM; |
1962 | err = copy_from_user(&rtmsg, arg, | |
1963 | sizeof(struct in6_rtmsg)); | |
1964 | if (err) | |
1965 | return -EFAULT; | |
86872cb5 | 1966 | |
5578689a | 1967 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1968 | |
1da177e4 LT |
1969 | rtnl_lock(); |
1970 | switch (cmd) { | |
1971 | case SIOCADDRT: | |
86872cb5 | 1972 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1973 | break; |
1974 | case SIOCDELRT: | |
86872cb5 | 1975 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1976 | break; |
1977 | default: | |
1978 | err = -EINVAL; | |
1979 | } | |
1980 | rtnl_unlock(); | |
1981 | ||
1982 | return err; | |
3ff50b79 | 1983 | } |
1da177e4 LT |
1984 | |
1985 | return -EINVAL; | |
1986 | } | |
1987 | ||
1988 | /* | |
1989 | * Drop the packet on the floor | |
1990 | */ | |
1991 | ||
d5fdd6ba | 1992 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1993 | { |
612f09e8 | 1994 | int type; |
adf30907 | 1995 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1996 | switch (ipstats_mib_noroutes) { |
1997 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1998 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 1999 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2000 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2001 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2002 | break; |
2003 | } | |
2004 | /* FALLTHROUGH */ | |
2005 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2006 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2007 | ipstats_mib_noroutes); | |
612f09e8 YH |
2008 | break; |
2009 | } | |
3ffe533c | 2010 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2011 | kfree_skb(skb); |
2012 | return 0; | |
2013 | } | |
2014 | ||
9ce8ade0 TG |
2015 | static int ip6_pkt_discard(struct sk_buff *skb) |
2016 | { | |
612f09e8 | 2017 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2018 | } |
2019 | ||
20380731 | 2020 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2021 | { |
adf30907 | 2022 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2023 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2024 | } |
2025 | ||
6723ab54 DM |
2026 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2027 | ||
9ce8ade0 TG |
2028 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2029 | { | |
612f09e8 | 2030 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2031 | } |
2032 | ||
2033 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2034 | { | |
adf30907 | 2035 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2036 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2037 | } |
2038 | ||
6723ab54 DM |
2039 | #endif |
2040 | ||
1da177e4 LT |
2041 | /* |
2042 | * Allocate a dst for local (unicast / anycast) address. | |
2043 | */ | |
2044 | ||
2045 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2046 | const struct in6_addr *addr, | |
8f031519 | 2047 | bool anycast) |
1da177e4 | 2048 | { |
c346dca1 | 2049 | struct net *net = dev_net(idev->dev); |
8b96d22d | 2050 | struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL); |
1da177e4 | 2051 | |
38308473 | 2052 | if (!rt) { |
f3213831 | 2053 | net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
1da177e4 | 2054 | return ERR_PTR(-ENOMEM); |
40385653 | 2055 | } |
1da177e4 | 2056 | |
1da177e4 LT |
2057 | in6_dev_hold(idev); |
2058 | ||
11d53b49 | 2059 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2060 | rt->dst.input = ip6_input; |
2061 | rt->dst.output = ip6_output; | |
1da177e4 | 2062 | rt->rt6i_idev = idev; |
1da177e4 LT |
2063 | |
2064 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2065 | if (anycast) |
2066 | rt->rt6i_flags |= RTF_ANYCAST; | |
2067 | else | |
1da177e4 | 2068 | rt->rt6i_flags |= RTF_LOCAL; |
1da177e4 | 2069 | |
4e3fd7a0 | 2070 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2071 | rt->rt6i_dst.plen = 128; |
5578689a | 2072 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2073 | |
d8d1f30b | 2074 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2075 | |
2076 | return rt; | |
2077 | } | |
2078 | ||
c3968a85 DW |
2079 | int ip6_route_get_saddr(struct net *net, |
2080 | struct rt6_info *rt, | |
b71d1d42 | 2081 | const struct in6_addr *daddr, |
c3968a85 DW |
2082 | unsigned int prefs, |
2083 | struct in6_addr *saddr) | |
2084 | { | |
2085 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2086 | int err = 0; | |
2087 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2088 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2089 | else |
2090 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2091 | daddr, prefs, saddr); | |
2092 | return err; | |
2093 | } | |
2094 | ||
2095 | /* remove deleted ip from prefsrc entries */ | |
2096 | struct arg_dev_net_ip { | |
2097 | struct net_device *dev; | |
2098 | struct net *net; | |
2099 | struct in6_addr *addr; | |
2100 | }; | |
2101 | ||
2102 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2103 | { | |
2104 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2105 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2106 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2107 | ||
d1918542 | 2108 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2109 | rt != net->ipv6.ip6_null_entry && |
2110 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2111 | /* remove prefsrc entry */ | |
2112 | rt->rt6i_prefsrc.plen = 0; | |
2113 | } | |
2114 | return 0; | |
2115 | } | |
2116 | ||
2117 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2118 | { | |
2119 | struct net *net = dev_net(ifp->idev->dev); | |
2120 | struct arg_dev_net_ip adni = { | |
2121 | .dev = ifp->idev->dev, | |
2122 | .net = net, | |
2123 | .addr = &ifp->addr, | |
2124 | }; | |
2125 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2126 | } | |
2127 | ||
8ed67789 DL |
2128 | struct arg_dev_net { |
2129 | struct net_device *dev; | |
2130 | struct net *net; | |
2131 | }; | |
2132 | ||
1da177e4 LT |
2133 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2134 | { | |
bc3ef660 | 2135 | const struct arg_dev_net *adn = arg; |
2136 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2137 | |
d1918542 | 2138 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2139 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2140 | return -1; |
c159d30c | 2141 | |
1da177e4 LT |
2142 | return 0; |
2143 | } | |
2144 | ||
f3db4851 | 2145 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2146 | { |
8ed67789 DL |
2147 | struct arg_dev_net adn = { |
2148 | .dev = dev, | |
2149 | .net = net, | |
2150 | }; | |
2151 | ||
2152 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2153 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2154 | } |
2155 | ||
95c96174 | 2156 | struct rt6_mtu_change_arg { |
1da177e4 | 2157 | struct net_device *dev; |
95c96174 | 2158 | unsigned int mtu; |
1da177e4 LT |
2159 | }; |
2160 | ||
2161 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2162 | { | |
2163 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2164 | struct inet6_dev *idev; | |
2165 | ||
2166 | /* In IPv6 pmtu discovery is not optional, | |
2167 | so that RTAX_MTU lock cannot disable it. | |
2168 | We still use this lock to block changes | |
2169 | caused by addrconf/ndisc. | |
2170 | */ | |
2171 | ||
2172 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2173 | if (!idev) |
1da177e4 LT |
2174 | return 0; |
2175 | ||
2176 | /* For administrative MTU increase, there is no way to discover | |
2177 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2178 | Since RFC 1981 doesn't include administrative MTU increase | |
2179 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2180 | */ | |
2181 | /* | |
2182 | If new MTU is less than route PMTU, this new MTU will be the | |
2183 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2184 | decreases; if new MTU is greater than route PMTU, and the | |
2185 | old MTU is the lowest MTU in the path, update the route PMTU | |
2186 | to reflect the increase. In this case if the other nodes' MTU | |
2187 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2188 | PMTU discouvery. | |
2189 | */ | |
d1918542 | 2190 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2191 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2192 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2193 | (dst_mtu(&rt->dst) < arg->mtu && | |
2194 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2195 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2196 | } |
1da177e4 LT |
2197 | return 0; |
2198 | } | |
2199 | ||
95c96174 | 2200 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2201 | { |
c71099ac TG |
2202 | struct rt6_mtu_change_arg arg = { |
2203 | .dev = dev, | |
2204 | .mtu = mtu, | |
2205 | }; | |
1da177e4 | 2206 | |
c346dca1 | 2207 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2208 | } |
2209 | ||
ef7c79ed | 2210 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2211 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2212 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2213 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2214 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2215 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
51ebd318 | 2216 | [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, |
86872cb5 TG |
2217 | }; |
2218 | ||
2219 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2220 | struct fib6_config *cfg) | |
1da177e4 | 2221 | { |
86872cb5 TG |
2222 | struct rtmsg *rtm; |
2223 | struct nlattr *tb[RTA_MAX+1]; | |
2224 | int err; | |
1da177e4 | 2225 | |
86872cb5 TG |
2226 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2227 | if (err < 0) | |
2228 | goto errout; | |
1da177e4 | 2229 | |
86872cb5 TG |
2230 | err = -EINVAL; |
2231 | rtm = nlmsg_data(nlh); | |
2232 | memset(cfg, 0, sizeof(*cfg)); | |
2233 | ||
2234 | cfg->fc_table = rtm->rtm_table; | |
2235 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2236 | cfg->fc_src_len = rtm->rtm_src_len; | |
2237 | cfg->fc_flags = RTF_UP; | |
2238 | cfg->fc_protocol = rtm->rtm_protocol; | |
ef2c7d7b | 2239 | cfg->fc_type = rtm->rtm_type; |
86872cb5 | 2240 | |
ef2c7d7b ND |
2241 | if (rtm->rtm_type == RTN_UNREACHABLE || |
2242 | rtm->rtm_type == RTN_BLACKHOLE || | |
b4949ab2 ND |
2243 | rtm->rtm_type == RTN_PROHIBIT || |
2244 | rtm->rtm_type == RTN_THROW) | |
86872cb5 TG |
2245 | cfg->fc_flags |= RTF_REJECT; |
2246 | ||
ab79ad14 MŻ |
2247 | if (rtm->rtm_type == RTN_LOCAL) |
2248 | cfg->fc_flags |= RTF_LOCAL; | |
2249 | ||
15e47304 | 2250 | cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; |
86872cb5 | 2251 | cfg->fc_nlinfo.nlh = nlh; |
3b1e0a65 | 2252 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2253 | |
2254 | if (tb[RTA_GATEWAY]) { | |
2255 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2256 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2257 | } |
86872cb5 TG |
2258 | |
2259 | if (tb[RTA_DST]) { | |
2260 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2261 | ||
2262 | if (nla_len(tb[RTA_DST]) < plen) | |
2263 | goto errout; | |
2264 | ||
2265 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2266 | } |
86872cb5 TG |
2267 | |
2268 | if (tb[RTA_SRC]) { | |
2269 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2270 | ||
2271 | if (nla_len(tb[RTA_SRC]) < plen) | |
2272 | goto errout; | |
2273 | ||
2274 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2275 | } |
86872cb5 | 2276 | |
c3968a85 DW |
2277 | if (tb[RTA_PREFSRC]) |
2278 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2279 | ||
86872cb5 TG |
2280 | if (tb[RTA_OIF]) |
2281 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2282 | ||
2283 | if (tb[RTA_PRIORITY]) | |
2284 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2285 | ||
2286 | if (tb[RTA_METRICS]) { | |
2287 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2288 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2289 | } |
86872cb5 TG |
2290 | |
2291 | if (tb[RTA_TABLE]) | |
2292 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2293 | ||
51ebd318 ND |
2294 | if (tb[RTA_MULTIPATH]) { |
2295 | cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); | |
2296 | cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); | |
2297 | } | |
2298 | ||
86872cb5 TG |
2299 | err = 0; |
2300 | errout: | |
2301 | return err; | |
1da177e4 LT |
2302 | } |
2303 | ||
51ebd318 ND |
2304 | static int ip6_route_multipath(struct fib6_config *cfg, int add) |
2305 | { | |
2306 | struct fib6_config r_cfg; | |
2307 | struct rtnexthop *rtnh; | |
2308 | int remaining; | |
2309 | int attrlen; | |
2310 | int err = 0, last_err = 0; | |
2311 | ||
2312 | beginning: | |
2313 | rtnh = (struct rtnexthop *)cfg->fc_mp; | |
2314 | remaining = cfg->fc_mp_len; | |
2315 | ||
2316 | /* Parse a Multipath Entry */ | |
2317 | while (rtnh_ok(rtnh, remaining)) { | |
2318 | memcpy(&r_cfg, cfg, sizeof(*cfg)); | |
2319 | if (rtnh->rtnh_ifindex) | |
2320 | r_cfg.fc_ifindex = rtnh->rtnh_ifindex; | |
2321 | ||
2322 | attrlen = rtnh_attrlen(rtnh); | |
2323 | if (attrlen > 0) { | |
2324 | struct nlattr *nla, *attrs = rtnh_attrs(rtnh); | |
2325 | ||
2326 | nla = nla_find(attrs, attrlen, RTA_GATEWAY); | |
2327 | if (nla) { | |
2328 | nla_memcpy(&r_cfg.fc_gateway, nla, 16); | |
2329 | r_cfg.fc_flags |= RTF_GATEWAY; | |
2330 | } | |
2331 | } | |
2332 | err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); | |
2333 | if (err) { | |
2334 | last_err = err; | |
2335 | /* If we are trying to remove a route, do not stop the | |
2336 | * loop when ip6_route_del() fails (because next hop is | |
2337 | * already gone), we should try to remove all next hops. | |
2338 | */ | |
2339 | if (add) { | |
2340 | /* If add fails, we should try to delete all | |
2341 | * next hops that have been already added. | |
2342 | */ | |
2343 | add = 0; | |
2344 | goto beginning; | |
2345 | } | |
2346 | } | |
1a72418b ND |
2347 | /* Because each route is added like a single route we remove |
2348 | * this flag after the first nexthop (if there is a collision, | |
2349 | * we have already fail to add the first nexthop: | |
2350 | * fib6_add_rt2node() has reject it). | |
2351 | */ | |
2352 | cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; | |
51ebd318 ND |
2353 | rtnh = rtnh_next(rtnh, &remaining); |
2354 | } | |
2355 | ||
2356 | return last_err; | |
2357 | } | |
2358 | ||
c127ea2c | 2359 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2360 | { |
86872cb5 TG |
2361 | struct fib6_config cfg; |
2362 | int err; | |
1da177e4 | 2363 | |
86872cb5 TG |
2364 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2365 | if (err < 0) | |
2366 | return err; | |
2367 | ||
51ebd318 ND |
2368 | if (cfg.fc_mp) |
2369 | return ip6_route_multipath(&cfg, 0); | |
2370 | else | |
2371 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2372 | } |
2373 | ||
c127ea2c | 2374 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2375 | { |
86872cb5 TG |
2376 | struct fib6_config cfg; |
2377 | int err; | |
1da177e4 | 2378 | |
86872cb5 TG |
2379 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2380 | if (err < 0) | |
2381 | return err; | |
2382 | ||
51ebd318 ND |
2383 | if (cfg.fc_mp) |
2384 | return ip6_route_multipath(&cfg, 1); | |
2385 | else | |
2386 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2387 | } |
2388 | ||
339bf98f TG |
2389 | static inline size_t rt6_nlmsg_size(void) |
2390 | { | |
2391 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2392 | + nla_total_size(16) /* RTA_SRC */ | |
2393 | + nla_total_size(16) /* RTA_DST */ | |
2394 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2395 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2396 | + nla_total_size(4) /* RTA_TABLE */ | |
2397 | + nla_total_size(4) /* RTA_IIF */ | |
2398 | + nla_total_size(4) /* RTA_OIF */ | |
2399 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2400 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2401 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2402 | } | |
2403 | ||
191cd582 BH |
2404 | static int rt6_fill_node(struct net *net, |
2405 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 | 2406 | struct in6_addr *dst, struct in6_addr *src, |
15e47304 | 2407 | int iif, int type, u32 portid, u32 seq, |
7bc570c8 | 2408 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2409 | { |
2410 | struct rtmsg *rtm; | |
2d7202bf | 2411 | struct nlmsghdr *nlh; |
e3703b3d | 2412 | long expires; |
9e762a4a | 2413 | u32 table; |
1da177e4 LT |
2414 | |
2415 | if (prefix) { /* user wants prefix routes only */ | |
2416 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2417 | /* success since this is not a prefix route */ | |
2418 | return 1; | |
2419 | } | |
2420 | } | |
2421 | ||
15e47304 | 2422 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); |
38308473 | 2423 | if (!nlh) |
26932566 | 2424 | return -EMSGSIZE; |
2d7202bf TG |
2425 | |
2426 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2427 | rtm->rtm_family = AF_INET6; |
2428 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2429 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2430 | rtm->rtm_tos = 0; | |
c71099ac | 2431 | if (rt->rt6i_table) |
9e762a4a | 2432 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2433 | else |
9e762a4a PM |
2434 | table = RT6_TABLE_UNSPEC; |
2435 | rtm->rtm_table = table; | |
c78679e8 DM |
2436 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2437 | goto nla_put_failure; | |
ef2c7d7b ND |
2438 | if (rt->rt6i_flags & RTF_REJECT) { |
2439 | switch (rt->dst.error) { | |
2440 | case -EINVAL: | |
2441 | rtm->rtm_type = RTN_BLACKHOLE; | |
2442 | break; | |
2443 | case -EACCES: | |
2444 | rtm->rtm_type = RTN_PROHIBIT; | |
2445 | break; | |
b4949ab2 ND |
2446 | case -EAGAIN: |
2447 | rtm->rtm_type = RTN_THROW; | |
2448 | break; | |
ef2c7d7b ND |
2449 | default: |
2450 | rtm->rtm_type = RTN_UNREACHABLE; | |
2451 | break; | |
2452 | } | |
2453 | } | |
38308473 | 2454 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2455 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2456 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2457 | rtm->rtm_type = RTN_LOCAL; |
2458 | else | |
2459 | rtm->rtm_type = RTN_UNICAST; | |
2460 | rtm->rtm_flags = 0; | |
2461 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2462 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2463 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 | 2464 | rtm->rtm_protocol = RTPROT_REDIRECT; |
f0396f60 DO |
2465 | else if (rt->rt6i_flags & RTF_ADDRCONF) { |
2466 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) | |
2467 | rtm->rtm_protocol = RTPROT_RA; | |
2468 | else | |
2469 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2470 | } | |
1da177e4 | 2471 | |
38308473 | 2472 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2473 | rtm->rtm_flags |= RTM_F_CLONED; |
2474 | ||
2475 | if (dst) { | |
c78679e8 DM |
2476 | if (nla_put(skb, RTA_DST, 16, dst)) |
2477 | goto nla_put_failure; | |
1ab1457c | 2478 | rtm->rtm_dst_len = 128; |
1da177e4 | 2479 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2480 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2481 | goto nla_put_failure; | |
1da177e4 LT |
2482 | #ifdef CONFIG_IPV6_SUBTREES |
2483 | if (src) { | |
c78679e8 DM |
2484 | if (nla_put(skb, RTA_SRC, 16, src)) |
2485 | goto nla_put_failure; | |
1ab1457c | 2486 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2487 | } else if (rtm->rtm_src_len && |
2488 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2489 | goto nla_put_failure; | |
1da177e4 | 2490 | #endif |
7bc570c8 YH |
2491 | if (iif) { |
2492 | #ifdef CONFIG_IPV6_MROUTE | |
2493 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2494 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2495 | if (err <= 0) { |
2496 | if (!nowait) { | |
2497 | if (err == 0) | |
2498 | return 0; | |
2499 | goto nla_put_failure; | |
2500 | } else { | |
2501 | if (err == -EMSGSIZE) | |
2502 | goto nla_put_failure; | |
2503 | } | |
2504 | } | |
2505 | } else | |
2506 | #endif | |
c78679e8 DM |
2507 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2508 | goto nla_put_failure; | |
7bc570c8 | 2509 | } else if (dst) { |
1da177e4 | 2510 | struct in6_addr saddr_buf; |
c78679e8 DM |
2511 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2512 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2513 | goto nla_put_failure; | |
1da177e4 | 2514 | } |
2d7202bf | 2515 | |
c3968a85 DW |
2516 | if (rt->rt6i_prefsrc.plen) { |
2517 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2518 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2519 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2520 | goto nla_put_failure; | |
c3968a85 DW |
2521 | } |
2522 | ||
defb3519 | 2523 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2524 | goto nla_put_failure; |
2525 | ||
dd0cbf29 YH |
2526 | if (rt->rt6i_flags & RTF_GATEWAY) { |
2527 | if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) | |
94f826b8 | 2528 | goto nla_put_failure; |
94f826b8 | 2529 | } |
2d7202bf | 2530 | |
c78679e8 DM |
2531 | if (rt->dst.dev && |
2532 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2533 | goto nla_put_failure; | |
2534 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2535 | goto nla_put_failure; | |
8253947e LW |
2536 | |
2537 | expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; | |
69cdf8f9 | 2538 | |
87a50699 | 2539 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) |
e3703b3d | 2540 | goto nla_put_failure; |
2d7202bf TG |
2541 | |
2542 | return nlmsg_end(skb, nlh); | |
2543 | ||
2544 | nla_put_failure: | |
26932566 PM |
2545 | nlmsg_cancel(skb, nlh); |
2546 | return -EMSGSIZE; | |
1da177e4 LT |
2547 | } |
2548 | ||
1b43af54 | 2549 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2550 | { |
2551 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2552 | int prefix; | |
2553 | ||
2d7202bf TG |
2554 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2555 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2556 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2557 | } else | |
2558 | prefix = 0; | |
2559 | ||
191cd582 BH |
2560 | return rt6_fill_node(arg->net, |
2561 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
15e47304 | 2562 | NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2563 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2564 | } |
2565 | ||
c127ea2c | 2566 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2567 | { |
3b1e0a65 | 2568 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2569 | struct nlattr *tb[RTA_MAX+1]; |
2570 | struct rt6_info *rt; | |
1da177e4 | 2571 | struct sk_buff *skb; |
ab364a6f | 2572 | struct rtmsg *rtm; |
4c9483b2 | 2573 | struct flowi6 fl6; |
72331bc0 | 2574 | int err, iif = 0, oif = 0; |
1da177e4 | 2575 | |
ab364a6f TG |
2576 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2577 | if (err < 0) | |
2578 | goto errout; | |
1da177e4 | 2579 | |
ab364a6f | 2580 | err = -EINVAL; |
4c9483b2 | 2581 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2582 | |
ab364a6f TG |
2583 | if (tb[RTA_SRC]) { |
2584 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2585 | goto errout; | |
2586 | ||
4e3fd7a0 | 2587 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2588 | } |
2589 | ||
2590 | if (tb[RTA_DST]) { | |
2591 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2592 | goto errout; | |
2593 | ||
4e3fd7a0 | 2594 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2595 | } |
2596 | ||
2597 | if (tb[RTA_IIF]) | |
2598 | iif = nla_get_u32(tb[RTA_IIF]); | |
2599 | ||
2600 | if (tb[RTA_OIF]) | |
72331bc0 | 2601 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2602 | |
2603 | if (iif) { | |
2604 | struct net_device *dev; | |
72331bc0 SL |
2605 | int flags = 0; |
2606 | ||
5578689a | 2607 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2608 | if (!dev) { |
2609 | err = -ENODEV; | |
ab364a6f | 2610 | goto errout; |
1da177e4 | 2611 | } |
72331bc0 SL |
2612 | |
2613 | fl6.flowi6_iif = iif; | |
2614 | ||
2615 | if (!ipv6_addr_any(&fl6.saddr)) | |
2616 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2617 | ||
2618 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2619 | flags); | |
2620 | } else { | |
2621 | fl6.flowi6_oif = oif; | |
2622 | ||
2623 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2624 | } |
2625 | ||
ab364a6f | 2626 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2627 | if (!skb) { |
94e187c0 | 2628 | ip6_rt_put(rt); |
ab364a6f TG |
2629 | err = -ENOBUFS; |
2630 | goto errout; | |
2631 | } | |
1da177e4 | 2632 | |
ab364a6f TG |
2633 | /* Reserve room for dummy headers, this skb can pass |
2634 | through good chunk of routing engine. | |
2635 | */ | |
459a98ed | 2636 | skb_reset_mac_header(skb); |
ab364a6f | 2637 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2638 | |
d8d1f30b | 2639 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2640 | |
4c9483b2 | 2641 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
15e47304 | 2642 | RTM_NEWROUTE, NETLINK_CB(in_skb).portid, |
7bc570c8 | 2643 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2644 | if (err < 0) { |
ab364a6f TG |
2645 | kfree_skb(skb); |
2646 | goto errout; | |
1da177e4 LT |
2647 | } |
2648 | ||
15e47304 | 2649 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
ab364a6f | 2650 | errout: |
1da177e4 | 2651 | return err; |
1da177e4 LT |
2652 | } |
2653 | ||
86872cb5 | 2654 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2655 | { |
2656 | struct sk_buff *skb; | |
5578689a | 2657 | struct net *net = info->nl_net; |
528c4ceb DL |
2658 | u32 seq; |
2659 | int err; | |
2660 | ||
2661 | err = -ENOBUFS; | |
38308473 | 2662 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2663 | |
339bf98f | 2664 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2665 | if (!skb) |
21713ebc TG |
2666 | goto errout; |
2667 | ||
191cd582 | 2668 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
15e47304 | 2669 | event, info->portid, seq, 0, 0, 0); |
26932566 PM |
2670 | if (err < 0) { |
2671 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2672 | WARN_ON(err == -EMSGSIZE); | |
2673 | kfree_skb(skb); | |
2674 | goto errout; | |
2675 | } | |
15e47304 | 2676 | rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, |
1ce85fe4 PNA |
2677 | info->nlh, gfp_any()); |
2678 | return; | |
21713ebc TG |
2679 | errout: |
2680 | if (err < 0) | |
5578689a | 2681 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2682 | } |
2683 | ||
8ed67789 DL |
2684 | static int ip6_route_dev_notify(struct notifier_block *this, |
2685 | unsigned long event, void *data) | |
2686 | { | |
2687 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2688 | struct net *net = dev_net(dev); |
8ed67789 DL |
2689 | |
2690 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2691 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2692 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2693 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2694 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2695 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2696 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2697 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2698 | #endif | |
2699 | } | |
2700 | ||
2701 | return NOTIFY_OK; | |
2702 | } | |
2703 | ||
1da177e4 LT |
2704 | /* |
2705 | * /proc | |
2706 | */ | |
2707 | ||
2708 | #ifdef CONFIG_PROC_FS | |
2709 | ||
1da177e4 LT |
2710 | struct rt6_proc_arg |
2711 | { | |
2712 | char *buffer; | |
2713 | int offset; | |
2714 | int length; | |
2715 | int skip; | |
2716 | int len; | |
2717 | }; | |
2718 | ||
2719 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2720 | { | |
33120b30 | 2721 | struct seq_file *m = p_arg; |
1da177e4 | 2722 | |
4b7a4274 | 2723 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2724 | |
2725 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2726 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2727 | #else |
33120b30 | 2728 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2729 | #endif |
dd0cbf29 YH |
2730 | if (rt->rt6i_flags & RTF_GATEWAY) { |
2731 | seq_printf(m, "%pi6", &rt->rt6i_gateway); | |
1da177e4 | 2732 | } else { |
33120b30 | 2733 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2734 | } |
33120b30 | 2735 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2736 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2737 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2738 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2739 | return 0; |
2740 | } | |
2741 | ||
33120b30 | 2742 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2743 | { |
f3db4851 | 2744 | struct net *net = (struct net *)m->private; |
32b293a5 | 2745 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2746 | return 0; |
2747 | } | |
1da177e4 | 2748 | |
33120b30 AD |
2749 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2750 | { | |
de05c557 | 2751 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2752 | } |
2753 | ||
33120b30 AD |
2754 | static const struct file_operations ipv6_route_proc_fops = { |
2755 | .owner = THIS_MODULE, | |
2756 | .open = ipv6_route_open, | |
2757 | .read = seq_read, | |
2758 | .llseek = seq_lseek, | |
b6fcbdb4 | 2759 | .release = single_release_net, |
33120b30 AD |
2760 | }; |
2761 | ||
1da177e4 LT |
2762 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2763 | { | |
69ddb805 | 2764 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2765 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2766 | net->ipv6.rt6_stats->fib_nodes, |
2767 | net->ipv6.rt6_stats->fib_route_nodes, | |
2768 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2769 | net->ipv6.rt6_stats->fib_rt_entries, | |
2770 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2771 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2772 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2773 | |
2774 | return 0; | |
2775 | } | |
2776 | ||
2777 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2778 | { | |
de05c557 | 2779 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2780 | } |
2781 | ||
9a32144e | 2782 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2783 | .owner = THIS_MODULE, |
2784 | .open = rt6_stats_seq_open, | |
2785 | .read = seq_read, | |
2786 | .llseek = seq_lseek, | |
b6fcbdb4 | 2787 | .release = single_release_net, |
1da177e4 LT |
2788 | }; |
2789 | #endif /* CONFIG_PROC_FS */ | |
2790 | ||
2791 | #ifdef CONFIG_SYSCTL | |
2792 | ||
1da177e4 | 2793 | static |
8d65af78 | 2794 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2795 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2796 | { | |
c486da34 LAG |
2797 | struct net *net; |
2798 | int delay; | |
2799 | if (!write) | |
1da177e4 | 2800 | return -EINVAL; |
c486da34 LAG |
2801 | |
2802 | net = (struct net *)ctl->extra1; | |
2803 | delay = net->ipv6.sysctl.flush_delay; | |
2804 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2805 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2806 | return 0; | |
1da177e4 LT |
2807 | } |
2808 | ||
760f2d01 | 2809 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2810 | { |
1da177e4 | 2811 | .procname = "flush", |
4990509f | 2812 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2813 | .maxlen = sizeof(int), |
89c8b3a1 | 2814 | .mode = 0200, |
6d9f239a | 2815 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2816 | }, |
2817 | { | |
1da177e4 | 2818 | .procname = "gc_thresh", |
9a7ec3a9 | 2819 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2820 | .maxlen = sizeof(int), |
2821 | .mode = 0644, | |
6d9f239a | 2822 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2823 | }, |
2824 | { | |
1da177e4 | 2825 | .procname = "max_size", |
4990509f | 2826 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2827 | .maxlen = sizeof(int), |
2828 | .mode = 0644, | |
6d9f239a | 2829 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2830 | }, |
2831 | { | |
1da177e4 | 2832 | .procname = "gc_min_interval", |
4990509f | 2833 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2834 | .maxlen = sizeof(int), |
2835 | .mode = 0644, | |
6d9f239a | 2836 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2837 | }, |
2838 | { | |
1da177e4 | 2839 | .procname = "gc_timeout", |
4990509f | 2840 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2841 | .maxlen = sizeof(int), |
2842 | .mode = 0644, | |
6d9f239a | 2843 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2844 | }, |
2845 | { | |
1da177e4 | 2846 | .procname = "gc_interval", |
4990509f | 2847 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2848 | .maxlen = sizeof(int), |
2849 | .mode = 0644, | |
6d9f239a | 2850 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2851 | }, |
2852 | { | |
1da177e4 | 2853 | .procname = "gc_elasticity", |
4990509f | 2854 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2855 | .maxlen = sizeof(int), |
2856 | .mode = 0644, | |
f3d3f616 | 2857 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2858 | }, |
2859 | { | |
1da177e4 | 2860 | .procname = "mtu_expires", |
4990509f | 2861 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2862 | .maxlen = sizeof(int), |
2863 | .mode = 0644, | |
6d9f239a | 2864 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2865 | }, |
2866 | { | |
1da177e4 | 2867 | .procname = "min_adv_mss", |
4990509f | 2868 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2869 | .maxlen = sizeof(int), |
2870 | .mode = 0644, | |
f3d3f616 | 2871 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2872 | }, |
2873 | { | |
1da177e4 | 2874 | .procname = "gc_min_interval_ms", |
4990509f | 2875 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2876 | .maxlen = sizeof(int), |
2877 | .mode = 0644, | |
6d9f239a | 2878 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2879 | }, |
f8572d8f | 2880 | { } |
1da177e4 LT |
2881 | }; |
2882 | ||
2c8c1e72 | 2883 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2884 | { |
2885 | struct ctl_table *table; | |
2886 | ||
2887 | table = kmemdup(ipv6_route_table_template, | |
2888 | sizeof(ipv6_route_table_template), | |
2889 | GFP_KERNEL); | |
5ee09105 YH |
2890 | |
2891 | if (table) { | |
2892 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2893 | table[0].extra1 = net; |
86393e52 | 2894 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2895 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2896 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2897 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2898 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2899 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2900 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2901 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2902 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
464dc801 EB |
2903 | |
2904 | /* Don't export sysctls to unprivileged users */ | |
2905 | if (net->user_ns != &init_user_ns) | |
2906 | table[0].procname = NULL; | |
5ee09105 YH |
2907 | } |
2908 | ||
760f2d01 DL |
2909 | return table; |
2910 | } | |
1da177e4 LT |
2911 | #endif |
2912 | ||
2c8c1e72 | 2913 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2914 | { |
633d424b | 2915 | int ret = -ENOMEM; |
8ed67789 | 2916 | |
86393e52 AD |
2917 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2918 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2919 | |
fc66f95c ED |
2920 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2921 | goto out_ip6_dst_ops; | |
2922 | ||
8ed67789 DL |
2923 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2924 | sizeof(*net->ipv6.ip6_null_entry), | |
2925 | GFP_KERNEL); | |
2926 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2927 | goto out_ip6_dst_entries; |
d8d1f30b | 2928 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2929 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2930 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2931 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2932 | ip6_template_metrics, true); | |
8ed67789 DL |
2933 | |
2934 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2935 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2936 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2937 | GFP_KERNEL); | |
68fffc67 PZ |
2938 | if (!net->ipv6.ip6_prohibit_entry) |
2939 | goto out_ip6_null_entry; | |
d8d1f30b | 2940 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2941 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2942 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2943 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2944 | ip6_template_metrics, true); | |
8ed67789 DL |
2945 | |
2946 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2947 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2948 | GFP_KERNEL); | |
68fffc67 PZ |
2949 | if (!net->ipv6.ip6_blk_hole_entry) |
2950 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2951 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2952 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2953 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2954 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2955 | ip6_template_metrics, true); | |
8ed67789 DL |
2956 | #endif |
2957 | ||
b339a47c PZ |
2958 | net->ipv6.sysctl.flush_delay = 0; |
2959 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2960 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2961 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2962 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2963 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2964 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2965 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2966 | ||
6891a346 BT |
2967 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2968 | ||
8ed67789 DL |
2969 | ret = 0; |
2970 | out: | |
2971 | return ret; | |
f2fc6a54 | 2972 | |
68fffc67 PZ |
2973 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2974 | out_ip6_prohibit_entry: | |
2975 | kfree(net->ipv6.ip6_prohibit_entry); | |
2976 | out_ip6_null_entry: | |
2977 | kfree(net->ipv6.ip6_null_entry); | |
2978 | #endif | |
fc66f95c ED |
2979 | out_ip6_dst_entries: |
2980 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2981 | out_ip6_dst_ops: |
f2fc6a54 | 2982 | goto out; |
cdb18761 DL |
2983 | } |
2984 | ||
2c8c1e72 | 2985 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 2986 | { |
8ed67789 DL |
2987 | kfree(net->ipv6.ip6_null_entry); |
2988 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2989 | kfree(net->ipv6.ip6_prohibit_entry); | |
2990 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2991 | #endif | |
41bb78b4 | 2992 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2993 | } |
2994 | ||
d189634e TG |
2995 | static int __net_init ip6_route_net_init_late(struct net *net) |
2996 | { | |
2997 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
2998 | proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); |
2999 | proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); | |
d189634e TG |
3000 | #endif |
3001 | return 0; | |
3002 | } | |
3003 | ||
3004 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
3005 | { | |
3006 | #ifdef CONFIG_PROC_FS | |
ece31ffd G |
3007 | remove_proc_entry("ipv6_route", net->proc_net); |
3008 | remove_proc_entry("rt6_stats", net->proc_net); | |
d189634e TG |
3009 | #endif |
3010 | } | |
3011 | ||
cdb18761 DL |
3012 | static struct pernet_operations ip6_route_net_ops = { |
3013 | .init = ip6_route_net_init, | |
3014 | .exit = ip6_route_net_exit, | |
3015 | }; | |
3016 | ||
c3426b47 DM |
3017 | static int __net_init ipv6_inetpeer_init(struct net *net) |
3018 | { | |
3019 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3020 | ||
3021 | if (!bp) | |
3022 | return -ENOMEM; | |
3023 | inet_peer_base_init(bp); | |
3024 | net->ipv6.peers = bp; | |
3025 | return 0; | |
3026 | } | |
3027 | ||
3028 | static void __net_exit ipv6_inetpeer_exit(struct net *net) | |
3029 | { | |
3030 | struct inet_peer_base *bp = net->ipv6.peers; | |
3031 | ||
3032 | net->ipv6.peers = NULL; | |
56a6b248 | 3033 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3034 | kfree(bp); |
3035 | } | |
3036 | ||
2b823f72 | 3037 | static struct pernet_operations ipv6_inetpeer_ops = { |
c3426b47 DM |
3038 | .init = ipv6_inetpeer_init, |
3039 | .exit = ipv6_inetpeer_exit, | |
3040 | }; | |
3041 | ||
d189634e TG |
3042 | static struct pernet_operations ip6_route_net_late_ops = { |
3043 | .init = ip6_route_net_init_late, | |
3044 | .exit = ip6_route_net_exit_late, | |
3045 | }; | |
3046 | ||
8ed67789 DL |
3047 | static struct notifier_block ip6_route_dev_notifier = { |
3048 | .notifier_call = ip6_route_dev_notify, | |
3049 | .priority = 0, | |
3050 | }; | |
3051 | ||
433d49c3 | 3052 | int __init ip6_route_init(void) |
1da177e4 | 3053 | { |
433d49c3 DL |
3054 | int ret; |
3055 | ||
9a7ec3a9 DL |
3056 | ret = -ENOMEM; |
3057 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3058 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3059 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3060 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3061 | goto out; |
14e50e57 | 3062 | |
fc66f95c | 3063 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3064 | if (ret) |
bdb3289f | 3065 | goto out_kmem_cache; |
bdb3289f | 3066 | |
c3426b47 DM |
3067 | ret = register_pernet_subsys(&ipv6_inetpeer_ops); |
3068 | if (ret) | |
e8803b6c | 3069 | goto out_dst_entries; |
2a0c451a | 3070 | |
7e52b33b DM |
3071 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3072 | if (ret) | |
3073 | goto out_register_inetpeer; | |
c3426b47 | 3074 | |
5dc121e9 AE |
3075 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3076 | ||
8ed67789 DL |
3077 | /* Registering of the loopback is done before this portion of code, |
3078 | * the loopback reference in rt6_info will not be taken, do it | |
3079 | * manually for init_net */ | |
d8d1f30b | 3080 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3081 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3082 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3083 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3084 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3085 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3086 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3087 | #endif | |
e8803b6c | 3088 | ret = fib6_init(); |
433d49c3 | 3089 | if (ret) |
8ed67789 | 3090 | goto out_register_subsys; |
433d49c3 | 3091 | |
433d49c3 DL |
3092 | ret = xfrm6_init(); |
3093 | if (ret) | |
e8803b6c | 3094 | goto out_fib6_init; |
c35b7e72 | 3095 | |
433d49c3 DL |
3096 | ret = fib6_rules_init(); |
3097 | if (ret) | |
3098 | goto xfrm6_init; | |
7e5449c2 | 3099 | |
d189634e TG |
3100 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3101 | if (ret) | |
3102 | goto fib6_rules_init; | |
3103 | ||
433d49c3 | 3104 | ret = -ENOBUFS; |
c7ac8679 GR |
3105 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3106 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3107 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3108 | goto out_register_late_subsys; |
c127ea2c | 3109 | |
8ed67789 | 3110 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3111 | if (ret) |
d189634e | 3112 | goto out_register_late_subsys; |
8ed67789 | 3113 | |
433d49c3 DL |
3114 | out: |
3115 | return ret; | |
3116 | ||
d189634e TG |
3117 | out_register_late_subsys: |
3118 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3119 | fib6_rules_init: |
433d49c3 DL |
3120 | fib6_rules_cleanup(); |
3121 | xfrm6_init: | |
433d49c3 | 3122 | xfrm6_fini(); |
2a0c451a TG |
3123 | out_fib6_init: |
3124 | fib6_gc_cleanup(); | |
8ed67789 DL |
3125 | out_register_subsys: |
3126 | unregister_pernet_subsys(&ip6_route_net_ops); | |
7e52b33b DM |
3127 | out_register_inetpeer: |
3128 | unregister_pernet_subsys(&ipv6_inetpeer_ops); | |
fc66f95c ED |
3129 | out_dst_entries: |
3130 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3131 | out_kmem_cache: |
f2fc6a54 | 3132 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3133 | goto out; |
1da177e4 LT |
3134 | } |
3135 | ||
3136 | void ip6_route_cleanup(void) | |
3137 | { | |
8ed67789 | 3138 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3139 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3140 | fib6_rules_cleanup(); |
1da177e4 | 3141 | xfrm6_fini(); |
1da177e4 | 3142 | fib6_gc_cleanup(); |
c3426b47 | 3143 | unregister_pernet_subsys(&ipv6_inetpeer_ops); |
8ed67789 | 3144 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3145 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3146 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3147 | } |