]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Linux INET6 implementation | |
3 | * FIB front-end. | |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | /* Changes: | |
15 | * | |
16 | * YOSHIFUJI Hideaki @USAGI | |
17 | * reworked default router selection. | |
18 | * - respect outgoing interface | |
19 | * - select from (probably) reachable routers (i.e. | |
20 | * routers in REACHABLE, STALE, DELAY or PROBE states). | |
21 | * - always select the same router if it is (probably) | |
22 | * reachable. otherwise, round-robin the list. | |
c0bece9f YH |
23 | * Ville Nuorvala |
24 | * Fixed routing subtrees. | |
1da177e4 LT |
25 | */ |
26 | ||
f3213831 JP |
27 | #define pr_fmt(fmt) "IPv6: " fmt |
28 | ||
4fc268d2 | 29 | #include <linux/capability.h> |
1da177e4 | 30 | #include <linux/errno.h> |
bc3b2d7f | 31 | #include <linux/export.h> |
1da177e4 LT |
32 | #include <linux/types.h> |
33 | #include <linux/times.h> | |
34 | #include <linux/socket.h> | |
35 | #include <linux/sockios.h> | |
36 | #include <linux/net.h> | |
37 | #include <linux/route.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/in6.h> | |
7bc570c8 | 40 | #include <linux/mroute6.h> |
1da177e4 | 41 | #include <linux/init.h> |
1da177e4 | 42 | #include <linux/if_arp.h> |
1da177e4 LT |
43 | #include <linux/proc_fs.h> |
44 | #include <linux/seq_file.h> | |
5b7c931d | 45 | #include <linux/nsproxy.h> |
5a0e3ad6 | 46 | #include <linux/slab.h> |
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/snmp.h> |
49 | #include <net/ipv6.h> | |
50 | #include <net/ip6_fib.h> | |
51 | #include <net/ip6_route.h> | |
52 | #include <net/ndisc.h> | |
53 | #include <net/addrconf.h> | |
54 | #include <net/tcp.h> | |
55 | #include <linux/rtnetlink.h> | |
56 | #include <net/dst.h> | |
57 | #include <net/xfrm.h> | |
8d71740c | 58 | #include <net/netevent.h> |
21713ebc | 59 | #include <net/netlink.h> |
1da177e4 LT |
60 | |
61 | #include <asm/uaccess.h> | |
62 | ||
63 | #ifdef CONFIG_SYSCTL | |
64 | #include <linux/sysctl.h> | |
65 | #endif | |
66 | ||
1716a961 | 67 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 68 | const struct in6_addr *dest); |
1da177e4 | 69 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
0dbaee3b | 70 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
ebb762f2 | 71 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
1da177e4 LT |
72 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
73 | static void ip6_dst_destroy(struct dst_entry *); | |
74 | static void ip6_dst_ifdown(struct dst_entry *, | |
75 | struct net_device *dev, int how); | |
569d3645 | 76 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
77 | |
78 | static int ip6_pkt_discard(struct sk_buff *skb); | |
79 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
80 | static void ip6_link_failure(struct sk_buff *skb); | |
81 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
82 | ||
70ceb4f5 | 83 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 84 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
85 | const struct in6_addr *prefix, int prefixlen, |
86 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 87 | unsigned int pref); |
efa2cea0 | 88 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
89 | const struct in6_addr *prefix, int prefixlen, |
90 | const struct in6_addr *gwaddr, int ifindex); | |
70ceb4f5 YH |
91 | #endif |
92 | ||
06582540 DM |
93 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
94 | { | |
95 | struct rt6_info *rt = (struct rt6_info *) dst; | |
96 | struct inet_peer *peer; | |
97 | u32 *p = NULL; | |
98 | ||
8e2ec639 YZ |
99 | if (!(rt->dst.flags & DST_HOST)) |
100 | return NULL; | |
101 | ||
06582540 DM |
102 | if (!rt->rt6i_peer) |
103 | rt6_bind_peer(rt, 1); | |
104 | ||
105 | peer = rt->rt6i_peer; | |
106 | if (peer) { | |
107 | u32 *old_p = __DST_METRICS_PTR(old); | |
108 | unsigned long prev, new; | |
109 | ||
110 | p = peer->metrics; | |
111 | if (inet_metrics_new(peer)) | |
112 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
113 | ||
114 | new = (unsigned long) p; | |
115 | prev = cmpxchg(&dst->_metrics, old, new); | |
116 | ||
117 | if (prev != old) { | |
118 | p = __DST_METRICS_PTR(prev); | |
119 | if (prev & DST_METRICS_READ_ONLY) | |
120 | p = NULL; | |
121 | } | |
122 | } | |
123 | return p; | |
124 | } | |
125 | ||
39232973 DM |
126 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr) |
127 | { | |
128 | struct in6_addr *p = &rt->rt6i_gateway; | |
129 | ||
a7563f34 | 130 | if (!ipv6_addr_any(p)) |
39232973 DM |
131 | return (const void *) p; |
132 | return daddr; | |
133 | } | |
134 | ||
d3aaeb38 DM |
135 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
136 | { | |
39232973 DM |
137 | struct rt6_info *rt = (struct rt6_info *) dst; |
138 | struct neighbour *n; | |
139 | ||
140 | daddr = choose_neigh_daddr(rt, daddr); | |
141 | n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); | |
f83c7790 DM |
142 | if (n) |
143 | return n; | |
144 | return neigh_create(&nd_tbl, daddr, dst->dev); | |
145 | } | |
146 | ||
8ade06c6 | 147 | static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev) |
f83c7790 | 148 | { |
8ade06c6 DM |
149 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway); |
150 | if (!n) { | |
151 | n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev); | |
152 | if (IS_ERR(n)) | |
153 | return PTR_ERR(n); | |
154 | } | |
f83c7790 DM |
155 | dst_set_neighbour(&rt->dst, n); |
156 | ||
157 | return 0; | |
d3aaeb38 DM |
158 | } |
159 | ||
9a7ec3a9 | 160 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 161 | .family = AF_INET6, |
09640e63 | 162 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
163 | .gc = ip6_dst_gc, |
164 | .gc_thresh = 1024, | |
165 | .check = ip6_dst_check, | |
0dbaee3b | 166 | .default_advmss = ip6_default_advmss, |
ebb762f2 | 167 | .mtu = ip6_mtu, |
06582540 | 168 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
169 | .destroy = ip6_dst_destroy, |
170 | .ifdown = ip6_dst_ifdown, | |
171 | .negative_advice = ip6_negative_advice, | |
172 | .link_failure = ip6_link_failure, | |
173 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 174 | .local_out = __ip6_local_out, |
d3aaeb38 | 175 | .neigh_lookup = ip6_neigh_lookup, |
1da177e4 LT |
176 | }; |
177 | ||
ebb762f2 | 178 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
ec831ea7 | 179 | { |
618f9bc7 SK |
180 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
181 | ||
182 | return mtu ? : dst->dev->mtu; | |
ec831ea7 RD |
183 | } |
184 | ||
14e50e57 DM |
185 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
186 | { | |
187 | } | |
188 | ||
0972ddb2 HB |
189 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
190 | unsigned long old) | |
191 | { | |
192 | return NULL; | |
193 | } | |
194 | ||
14e50e57 DM |
195 | static struct dst_ops ip6_dst_blackhole_ops = { |
196 | .family = AF_INET6, | |
09640e63 | 197 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
198 | .destroy = ip6_dst_destroy, |
199 | .check = ip6_dst_check, | |
ebb762f2 | 200 | .mtu = ip6_blackhole_mtu, |
214f45c9 | 201 | .default_advmss = ip6_default_advmss, |
14e50e57 | 202 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
0972ddb2 | 203 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
d3aaeb38 | 204 | .neigh_lookup = ip6_neigh_lookup, |
14e50e57 DM |
205 | }; |
206 | ||
62fa8a84 DM |
207 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
208 | [RTAX_HOPLIMIT - 1] = 255, | |
209 | }; | |
210 | ||
bdb3289f | 211 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
212 | .dst = { |
213 | .__refcnt = ATOMIC_INIT(1), | |
214 | .__use = 1, | |
215 | .obsolete = -1, | |
216 | .error = -ENETUNREACH, | |
d8d1f30b CG |
217 | .input = ip6_pkt_discard, |
218 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
219 | }, |
220 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 221 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
222 | .rt6i_metric = ~(u32) 0, |
223 | .rt6i_ref = ATOMIC_INIT(1), | |
224 | }; | |
225 | ||
101367c2 TG |
226 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
227 | ||
6723ab54 DM |
228 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
229 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 230 | |
280a34c8 | 231 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
232 | .dst = { |
233 | .__refcnt = ATOMIC_INIT(1), | |
234 | .__use = 1, | |
235 | .obsolete = -1, | |
236 | .error = -EACCES, | |
d8d1f30b CG |
237 | .input = ip6_pkt_prohibit, |
238 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
239 | }, |
240 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 241 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
242 | .rt6i_metric = ~(u32) 0, |
243 | .rt6i_ref = ATOMIC_INIT(1), | |
244 | }; | |
245 | ||
bdb3289f | 246 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
247 | .dst = { |
248 | .__refcnt = ATOMIC_INIT(1), | |
249 | .__use = 1, | |
250 | .obsolete = -1, | |
251 | .error = -EINVAL, | |
d8d1f30b CG |
252 | .input = dst_discard, |
253 | .output = dst_discard, | |
101367c2 TG |
254 | }, |
255 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 256 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
257 | .rt6i_metric = ~(u32) 0, |
258 | .rt6i_ref = ATOMIC_INIT(1), | |
259 | }; | |
260 | ||
261 | #endif | |
262 | ||
1da177e4 | 263 | /* allocate dst with ip6_dst_ops */ |
5c1e6aa3 | 264 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops, |
957c665f DM |
265 | struct net_device *dev, |
266 | int flags) | |
1da177e4 | 267 | { |
957c665f | 268 | struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags); |
cf911662 | 269 | |
38308473 | 270 | if (rt) |
fbe58186 | 271 | memset(&rt->rt6i_table, 0, |
38308473 | 272 | sizeof(*rt) - sizeof(struct dst_entry)); |
cf911662 DM |
273 | |
274 | return rt; | |
1da177e4 LT |
275 | } |
276 | ||
277 | static void ip6_dst_destroy(struct dst_entry *dst) | |
278 | { | |
279 | struct rt6_info *rt = (struct rt6_info *)dst; | |
280 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 281 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 | 282 | |
8e2ec639 YZ |
283 | if (!(rt->dst.flags & DST_HOST)) |
284 | dst_destroy_metrics_generic(dst); | |
285 | ||
38308473 | 286 | if (idev) { |
1da177e4 LT |
287 | rt->rt6i_idev = NULL; |
288 | in6_dev_put(idev); | |
1ab1457c | 289 | } |
1716a961 G |
290 | |
291 | if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from) | |
292 | dst_release(dst->from); | |
293 | ||
b3419363 | 294 | if (peer) { |
b3419363 DM |
295 | rt->rt6i_peer = NULL; |
296 | inet_putpeer(peer); | |
297 | } | |
298 | } | |
299 | ||
6431cbc2 DM |
300 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
301 | ||
302 | static u32 rt6_peer_genid(void) | |
303 | { | |
304 | return atomic_read(&__rt6_peer_genid); | |
305 | } | |
306 | ||
b3419363 DM |
307 | void rt6_bind_peer(struct rt6_info *rt, int create) |
308 | { | |
309 | struct inet_peer *peer; | |
310 | ||
b3419363 DM |
311 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
312 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
313 | inet_putpeer(peer); | |
6431cbc2 DM |
314 | else |
315 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1da177e4 LT |
316 | } |
317 | ||
318 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
319 | int how) | |
320 | { | |
321 | struct rt6_info *rt = (struct rt6_info *)dst; | |
322 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 323 | struct net_device *loopback_dev = |
c346dca1 | 324 | dev_net(dev)->loopback_dev; |
1da177e4 | 325 | |
38308473 | 326 | if (dev != loopback_dev && idev && idev->dev == dev) { |
5a3e55d6 DL |
327 | struct inet6_dev *loopback_idev = |
328 | in6_dev_get(loopback_dev); | |
38308473 | 329 | if (loopback_idev) { |
1da177e4 LT |
330 | rt->rt6i_idev = loopback_idev; |
331 | in6_dev_put(idev); | |
332 | } | |
333 | } | |
334 | } | |
335 | ||
a50feda5 | 336 | static bool rt6_check_expired(const struct rt6_info *rt) |
1da177e4 | 337 | { |
1716a961 G |
338 | struct rt6_info *ort = NULL; |
339 | ||
340 | if (rt->rt6i_flags & RTF_EXPIRES) { | |
341 | if (time_after(jiffies, rt->dst.expires)) | |
a50feda5 | 342 | return true; |
1716a961 G |
343 | } else if (rt->dst.from) { |
344 | ort = (struct rt6_info *) rt->dst.from; | |
345 | return (ort->rt6i_flags & RTF_EXPIRES) && | |
346 | time_after(jiffies, ort->dst.expires); | |
347 | } | |
a50feda5 | 348 | return false; |
1da177e4 LT |
349 | } |
350 | ||
a50feda5 | 351 | static bool rt6_need_strict(const struct in6_addr *daddr) |
c71099ac | 352 | { |
a02cec21 ED |
353 | return ipv6_addr_type(daddr) & |
354 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
355 | } |
356 | ||
1da177e4 | 357 | /* |
c71099ac | 358 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
359 | */ |
360 | ||
8ed67789 DL |
361 | static inline struct rt6_info *rt6_device_match(struct net *net, |
362 | struct rt6_info *rt, | |
b71d1d42 | 363 | const struct in6_addr *saddr, |
1da177e4 | 364 | int oif, |
d420895e | 365 | int flags) |
1da177e4 LT |
366 | { |
367 | struct rt6_info *local = NULL; | |
368 | struct rt6_info *sprt; | |
369 | ||
dd3abc4e YH |
370 | if (!oif && ipv6_addr_any(saddr)) |
371 | goto out; | |
372 | ||
d8d1f30b | 373 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
d1918542 | 374 | struct net_device *dev = sprt->dst.dev; |
dd3abc4e YH |
375 | |
376 | if (oif) { | |
1da177e4 LT |
377 | if (dev->ifindex == oif) |
378 | return sprt; | |
379 | if (dev->flags & IFF_LOOPBACK) { | |
38308473 | 380 | if (!sprt->rt6i_idev || |
1da177e4 | 381 | sprt->rt6i_idev->dev->ifindex != oif) { |
d420895e | 382 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 383 | continue; |
1ab1457c | 384 | if (local && (!oif || |
1da177e4 LT |
385 | local->rt6i_idev->dev->ifindex == oif)) |
386 | continue; | |
387 | } | |
388 | local = sprt; | |
389 | } | |
dd3abc4e YH |
390 | } else { |
391 | if (ipv6_chk_addr(net, saddr, dev, | |
392 | flags & RT6_LOOKUP_F_IFACE)) | |
393 | return sprt; | |
1da177e4 | 394 | } |
dd3abc4e | 395 | } |
1da177e4 | 396 | |
dd3abc4e | 397 | if (oif) { |
1da177e4 LT |
398 | if (local) |
399 | return local; | |
400 | ||
d420895e | 401 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 402 | return net->ipv6.ip6_null_entry; |
1da177e4 | 403 | } |
dd3abc4e | 404 | out: |
1da177e4 LT |
405 | return rt; |
406 | } | |
407 | ||
27097255 YH |
408 | #ifdef CONFIG_IPV6_ROUTER_PREF |
409 | static void rt6_probe(struct rt6_info *rt) | |
410 | { | |
f2c31e32 | 411 | struct neighbour *neigh; |
27097255 YH |
412 | /* |
413 | * Okay, this does not seem to be appropriate | |
414 | * for now, however, we need to check if it | |
415 | * is really so; aka Router Reachability Probing. | |
416 | * | |
417 | * Router Reachability Probe MUST be rate-limited | |
418 | * to no more than one per minute. | |
419 | */ | |
f2c31e32 | 420 | rcu_read_lock(); |
27217455 | 421 | neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL; |
27097255 | 422 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
f2c31e32 | 423 | goto out; |
27097255 YH |
424 | read_lock_bh(&neigh->lock); |
425 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 426 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
427 | struct in6_addr mcaddr; |
428 | struct in6_addr *target; | |
429 | ||
430 | neigh->updated = jiffies; | |
431 | read_unlock_bh(&neigh->lock); | |
432 | ||
433 | target = (struct in6_addr *)&neigh->primary_key; | |
434 | addrconf_addr_solict_mult(target, &mcaddr); | |
d1918542 | 435 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
f2c31e32 | 436 | } else { |
27097255 | 437 | read_unlock_bh(&neigh->lock); |
f2c31e32 ED |
438 | } |
439 | out: | |
440 | rcu_read_unlock(); | |
27097255 YH |
441 | } |
442 | #else | |
443 | static inline void rt6_probe(struct rt6_info *rt) | |
444 | { | |
27097255 YH |
445 | } |
446 | #endif | |
447 | ||
1da177e4 | 448 | /* |
554cfb7e | 449 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 450 | */ |
b6f99a21 | 451 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e | 452 | { |
d1918542 | 453 | struct net_device *dev = rt->dst.dev; |
161980f4 | 454 | if (!oif || dev->ifindex == oif) |
554cfb7e | 455 | return 2; |
161980f4 DM |
456 | if ((dev->flags & IFF_LOOPBACK) && |
457 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
458 | return 1; | |
459 | return 0; | |
554cfb7e | 460 | } |
1da177e4 | 461 | |
b6f99a21 | 462 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 463 | { |
f2c31e32 | 464 | struct neighbour *neigh; |
398bcbeb | 465 | int m; |
f2c31e32 ED |
466 | |
467 | rcu_read_lock(); | |
27217455 | 468 | neigh = dst_get_neighbour_noref(&rt->dst); |
4d0c5911 YH |
469 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
470 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
471 | m = 1; | |
472 | else if (neigh) { | |
554cfb7e YH |
473 | read_lock_bh(&neigh->lock); |
474 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 475 | m = 2; |
398bcbeb YH |
476 | #ifdef CONFIG_IPV6_ROUTER_PREF |
477 | else if (neigh->nud_state & NUD_FAILED) | |
478 | m = 0; | |
479 | #endif | |
480 | else | |
ea73ee23 | 481 | m = 1; |
554cfb7e | 482 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
483 | } else |
484 | m = 0; | |
f2c31e32 | 485 | rcu_read_unlock(); |
554cfb7e | 486 | return m; |
1da177e4 LT |
487 | } |
488 | ||
554cfb7e YH |
489 | static int rt6_score_route(struct rt6_info *rt, int oif, |
490 | int strict) | |
1da177e4 | 491 | { |
4d0c5911 | 492 | int m, n; |
1ab1457c | 493 | |
4d0c5911 | 494 | m = rt6_check_dev(rt, oif); |
77d16f45 | 495 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 496 | return -1; |
ebacaaa0 YH |
497 | #ifdef CONFIG_IPV6_ROUTER_PREF |
498 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
499 | #endif | |
4d0c5911 | 500 | n = rt6_check_neigh(rt); |
557e92ef | 501 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
502 | return -1; |
503 | return m; | |
504 | } | |
505 | ||
f11e6659 DM |
506 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
507 | int *mpri, struct rt6_info *match) | |
554cfb7e | 508 | { |
f11e6659 DM |
509 | int m; |
510 | ||
511 | if (rt6_check_expired(rt)) | |
512 | goto out; | |
513 | ||
514 | m = rt6_score_route(rt, oif, strict); | |
515 | if (m < 0) | |
516 | goto out; | |
517 | ||
518 | if (m > *mpri) { | |
519 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
520 | rt6_probe(match); | |
521 | *mpri = m; | |
522 | match = rt; | |
523 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
524 | rt6_probe(rt); | |
525 | } | |
526 | ||
527 | out: | |
528 | return match; | |
529 | } | |
530 | ||
531 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
532 | struct rt6_info *rr_head, | |
533 | u32 metric, int oif, int strict) | |
534 | { | |
535 | struct rt6_info *rt, *match; | |
554cfb7e | 536 | int mpri = -1; |
1da177e4 | 537 | |
f11e6659 DM |
538 | match = NULL; |
539 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 540 | rt = rt->dst.rt6_next) |
f11e6659 DM |
541 | match = find_match(rt, oif, strict, &mpri, match); |
542 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 543 | rt = rt->dst.rt6_next) |
f11e6659 | 544 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 545 | |
f11e6659 DM |
546 | return match; |
547 | } | |
1da177e4 | 548 | |
f11e6659 DM |
549 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
550 | { | |
551 | struct rt6_info *match, *rt0; | |
8ed67789 | 552 | struct net *net; |
1da177e4 | 553 | |
f11e6659 DM |
554 | rt0 = fn->rr_ptr; |
555 | if (!rt0) | |
556 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 557 | |
f11e6659 | 558 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 559 | |
554cfb7e | 560 | if (!match && |
f11e6659 | 561 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 562 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 563 | |
554cfb7e | 564 | /* no entries matched; do round-robin */ |
f11e6659 DM |
565 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
566 | next = fn->leaf; | |
567 | ||
568 | if (next != rt0) | |
569 | fn->rr_ptr = next; | |
1da177e4 | 570 | } |
1da177e4 | 571 | |
d1918542 | 572 | net = dev_net(rt0->dst.dev); |
a02cec21 | 573 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
574 | } |
575 | ||
70ceb4f5 YH |
576 | #ifdef CONFIG_IPV6_ROUTE_INFO |
577 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
b71d1d42 | 578 | const struct in6_addr *gwaddr) |
70ceb4f5 | 579 | { |
c346dca1 | 580 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
581 | struct route_info *rinfo = (struct route_info *) opt; |
582 | struct in6_addr prefix_buf, *prefix; | |
583 | unsigned int pref; | |
4bed72e4 | 584 | unsigned long lifetime; |
70ceb4f5 YH |
585 | struct rt6_info *rt; |
586 | ||
587 | if (len < sizeof(struct route_info)) { | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | /* Sanity check for prefix_len and length */ | |
592 | if (rinfo->length > 3) { | |
593 | return -EINVAL; | |
594 | } else if (rinfo->prefix_len > 128) { | |
595 | return -EINVAL; | |
596 | } else if (rinfo->prefix_len > 64) { | |
597 | if (rinfo->length < 2) { | |
598 | return -EINVAL; | |
599 | } | |
600 | } else if (rinfo->prefix_len > 0) { | |
601 | if (rinfo->length < 1) { | |
602 | return -EINVAL; | |
603 | } | |
604 | } | |
605 | ||
606 | pref = rinfo->route_pref; | |
607 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 608 | return -EINVAL; |
70ceb4f5 | 609 | |
4bed72e4 | 610 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
611 | |
612 | if (rinfo->length == 3) | |
613 | prefix = (struct in6_addr *)rinfo->prefix; | |
614 | else { | |
615 | /* this function is safe */ | |
616 | ipv6_addr_prefix(&prefix_buf, | |
617 | (struct in6_addr *)rinfo->prefix, | |
618 | rinfo->prefix_len); | |
619 | prefix = &prefix_buf; | |
620 | } | |
621 | ||
efa2cea0 DL |
622 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
623 | dev->ifindex); | |
70ceb4f5 YH |
624 | |
625 | if (rt && !lifetime) { | |
e0a1ad73 | 626 | ip6_del_rt(rt); |
70ceb4f5 YH |
627 | rt = NULL; |
628 | } | |
629 | ||
630 | if (!rt && lifetime) | |
efa2cea0 | 631 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
632 | pref); |
633 | else if (rt) | |
634 | rt->rt6i_flags = RTF_ROUTEINFO | | |
635 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
636 | ||
637 | if (rt) { | |
1716a961 G |
638 | if (!addrconf_finite_timeout(lifetime)) |
639 | rt6_clean_expires(rt); | |
640 | else | |
641 | rt6_set_expires(rt, jiffies + HZ * lifetime); | |
642 | ||
d8d1f30b | 643 | dst_release(&rt->dst); |
70ceb4f5 YH |
644 | } |
645 | return 0; | |
646 | } | |
647 | #endif | |
648 | ||
8ed67789 | 649 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 650 | do { \ |
8ed67789 | 651 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 652 | struct fib6_node *pn; \ |
e0eda7bb | 653 | while (1) { \ |
982f56f3 YH |
654 | if (fn->fn_flags & RTN_TL_ROOT) \ |
655 | goto out; \ | |
656 | pn = fn->parent; \ | |
657 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 658 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
659 | else \ |
660 | fn = pn; \ | |
661 | if (fn->fn_flags & RTN_RTINFO) \ | |
662 | goto restart; \ | |
c71099ac | 663 | } \ |
c71099ac | 664 | } \ |
38308473 | 665 | } while (0) |
c71099ac | 666 | |
8ed67789 DL |
667 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
668 | struct fib6_table *table, | |
4c9483b2 | 669 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
670 | { |
671 | struct fib6_node *fn; | |
672 | struct rt6_info *rt; | |
673 | ||
c71099ac | 674 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 675 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
c71099ac TG |
676 | restart: |
677 | rt = fn->leaf; | |
4c9483b2 DM |
678 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
679 | BACKTRACK(net, &fl6->saddr); | |
c71099ac | 680 | out: |
d8d1f30b | 681 | dst_use(&rt->dst, jiffies); |
c71099ac | 682 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
683 | return rt; |
684 | ||
685 | } | |
686 | ||
ea6e574e FW |
687 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
688 | int flags) | |
689 | { | |
690 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); | |
691 | } | |
692 | EXPORT_SYMBOL_GPL(ip6_route_lookup); | |
693 | ||
9acd9f3a YH |
694 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
695 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac | 696 | { |
4c9483b2 DM |
697 | struct flowi6 fl6 = { |
698 | .flowi6_oif = oif, | |
699 | .daddr = *daddr, | |
c71099ac TG |
700 | }; |
701 | struct dst_entry *dst; | |
77d16f45 | 702 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 703 | |
adaa70bb | 704 | if (saddr) { |
4c9483b2 | 705 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
adaa70bb TG |
706 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
707 | } | |
708 | ||
4c9483b2 | 709 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
c71099ac TG |
710 | if (dst->error == 0) |
711 | return (struct rt6_info *) dst; | |
712 | ||
713 | dst_release(dst); | |
714 | ||
1da177e4 LT |
715 | return NULL; |
716 | } | |
717 | ||
7159039a YH |
718 | EXPORT_SYMBOL(rt6_lookup); |
719 | ||
c71099ac | 720 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
721 | It takes new route entry, the addition fails by any reason the |
722 | route is freed. In any case, if caller does not hold it, it may | |
723 | be destroyed. | |
724 | */ | |
725 | ||
86872cb5 | 726 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
727 | { |
728 | int err; | |
c71099ac | 729 | struct fib6_table *table; |
1da177e4 | 730 | |
c71099ac TG |
731 | table = rt->rt6i_table; |
732 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 733 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 734 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
735 | |
736 | return err; | |
737 | } | |
738 | ||
40e22e8f TG |
739 | int ip6_ins_rt(struct rt6_info *rt) |
740 | { | |
4d1169c1 | 741 | struct nl_info info = { |
d1918542 | 742 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 743 | }; |
528c4ceb | 744 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
745 | } |
746 | ||
1716a961 | 747 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
21efcfa0 | 748 | const struct in6_addr *daddr, |
b71d1d42 | 749 | const struct in6_addr *saddr) |
1da177e4 | 750 | { |
1da177e4 LT |
751 | struct rt6_info *rt; |
752 | ||
753 | /* | |
754 | * Clone the route. | |
755 | */ | |
756 | ||
21efcfa0 | 757 | rt = ip6_rt_copy(ort, daddr); |
1da177e4 LT |
758 | |
759 | if (rt) { | |
14deae41 DM |
760 | int attempts = !in_softirq(); |
761 | ||
38308473 | 762 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
bb3c3686 | 763 | if (ort->rt6i_dst.plen != 128 && |
21efcfa0 | 764 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
58c4fb86 | 765 | rt->rt6i_flags |= RTF_ANYCAST; |
4e3fd7a0 | 766 | rt->rt6i_gateway = *daddr; |
58c4fb86 | 767 | } |
1da177e4 | 768 | |
1da177e4 | 769 | rt->rt6i_flags |= RTF_CACHE; |
1da177e4 LT |
770 | |
771 | #ifdef CONFIG_IPV6_SUBTREES | |
772 | if (rt->rt6i_src.plen && saddr) { | |
4e3fd7a0 | 773 | rt->rt6i_src.addr = *saddr; |
1da177e4 LT |
774 | rt->rt6i_src.plen = 128; |
775 | } | |
776 | #endif | |
777 | ||
14deae41 | 778 | retry: |
8ade06c6 | 779 | if (rt6_bind_neighbour(rt, rt->dst.dev)) { |
d1918542 | 780 | struct net *net = dev_net(rt->dst.dev); |
14deae41 DM |
781 | int saved_rt_min_interval = |
782 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
783 | int saved_rt_elasticity = | |
784 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
785 | ||
786 | if (attempts-- > 0) { | |
787 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
788 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
789 | ||
86393e52 | 790 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
791 | |
792 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
793 | saved_rt_elasticity; | |
794 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
795 | saved_rt_min_interval; | |
796 | goto retry; | |
797 | } | |
798 | ||
f3213831 | 799 | net_warn_ratelimited("Neighbour table overflow\n"); |
d8d1f30b | 800 | dst_free(&rt->dst); |
14deae41 DM |
801 | return NULL; |
802 | } | |
95a9a5ba | 803 | } |
1da177e4 | 804 | |
95a9a5ba YH |
805 | return rt; |
806 | } | |
1da177e4 | 807 | |
21efcfa0 ED |
808 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
809 | const struct in6_addr *daddr) | |
299d9939 | 810 | { |
21efcfa0 ED |
811 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
812 | ||
299d9939 | 813 | if (rt) { |
299d9939 | 814 | rt->rt6i_flags |= RTF_CACHE; |
27217455 | 815 | dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst))); |
299d9939 YH |
816 | } |
817 | return rt; | |
818 | } | |
819 | ||
8ed67789 | 820 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
4c9483b2 | 821 | struct flowi6 *fl6, int flags) |
1da177e4 LT |
822 | { |
823 | struct fib6_node *fn; | |
519fbd87 | 824 | struct rt6_info *rt, *nrt; |
c71099ac | 825 | int strict = 0; |
1da177e4 | 826 | int attempts = 3; |
519fbd87 | 827 | int err; |
53b7997f | 828 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 829 | |
77d16f45 | 830 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
831 | |
832 | relookup: | |
c71099ac | 833 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 834 | |
8238dd06 | 835 | restart_2: |
4c9483b2 | 836 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
1da177e4 LT |
837 | |
838 | restart: | |
4acad72d | 839 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 | 840 | |
4c9483b2 | 841 | BACKTRACK(net, &fl6->saddr); |
8ed67789 | 842 | if (rt == net->ipv6.ip6_null_entry || |
8238dd06 | 843 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 844 | goto out; |
1da177e4 | 845 | |
d8d1f30b | 846 | dst_hold(&rt->dst); |
c71099ac | 847 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 848 | |
27217455 | 849 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
4c9483b2 | 850 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
7343ff31 | 851 | else if (!(rt->dst.flags & DST_HOST)) |
4c9483b2 | 852 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
7343ff31 DM |
853 | else |
854 | goto out2; | |
e40cf353 | 855 | |
d8d1f30b | 856 | dst_release(&rt->dst); |
8ed67789 | 857 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 858 | |
d8d1f30b | 859 | dst_hold(&rt->dst); |
519fbd87 | 860 | if (nrt) { |
40e22e8f | 861 | err = ip6_ins_rt(nrt); |
519fbd87 | 862 | if (!err) |
1da177e4 | 863 | goto out2; |
1da177e4 | 864 | } |
1da177e4 | 865 | |
519fbd87 YH |
866 | if (--attempts <= 0) |
867 | goto out2; | |
868 | ||
869 | /* | |
c71099ac | 870 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
871 | * released someone could insert this route. Relookup. |
872 | */ | |
d8d1f30b | 873 | dst_release(&rt->dst); |
519fbd87 YH |
874 | goto relookup; |
875 | ||
876 | out: | |
8238dd06 YH |
877 | if (reachable) { |
878 | reachable = 0; | |
879 | goto restart_2; | |
880 | } | |
d8d1f30b | 881 | dst_hold(&rt->dst); |
c71099ac | 882 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 883 | out2: |
d8d1f30b CG |
884 | rt->dst.lastuse = jiffies; |
885 | rt->dst.__use++; | |
c71099ac TG |
886 | |
887 | return rt; | |
1da177e4 LT |
888 | } |
889 | ||
8ed67789 | 890 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4c9483b2 | 891 | struct flowi6 *fl6, int flags) |
4acad72d | 892 | { |
4c9483b2 | 893 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
4acad72d PE |
894 | } |
895 | ||
72331bc0 SL |
896 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
897 | struct net_device *dev, | |
898 | struct flowi6 *fl6, int flags) | |
899 | { | |
900 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) | |
901 | flags |= RT6_LOOKUP_F_IFACE; | |
902 | ||
903 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); | |
904 | } | |
905 | ||
c71099ac TG |
906 | void ip6_route_input(struct sk_buff *skb) |
907 | { | |
b71d1d42 | 908 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 909 | struct net *net = dev_net(skb->dev); |
adaa70bb | 910 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
4c9483b2 DM |
911 | struct flowi6 fl6 = { |
912 | .flowi6_iif = skb->dev->ifindex, | |
913 | .daddr = iph->daddr, | |
914 | .saddr = iph->saddr, | |
38308473 | 915 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
4c9483b2 DM |
916 | .flowi6_mark = skb->mark, |
917 | .flowi6_proto = iph->nexthdr, | |
c71099ac | 918 | }; |
adaa70bb | 919 | |
72331bc0 | 920 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
c71099ac TG |
921 | } |
922 | ||
8ed67789 | 923 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
4c9483b2 | 924 | struct flowi6 *fl6, int flags) |
1da177e4 | 925 | { |
4c9483b2 | 926 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
c71099ac TG |
927 | } |
928 | ||
9c7a4f9c | 929 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
4c9483b2 | 930 | struct flowi6 *fl6) |
c71099ac TG |
931 | { |
932 | int flags = 0; | |
933 | ||
4c9483b2 | 934 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
77d16f45 | 935 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 936 | |
4c9483b2 | 937 | if (!ipv6_addr_any(&fl6->saddr)) |
adaa70bb | 938 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
0c9a2ac1 YH |
939 | else if (sk) |
940 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 941 | |
4c9483b2 | 942 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
1da177e4 LT |
943 | } |
944 | ||
7159039a | 945 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 946 | |
2774c131 | 947 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 948 | { |
5c1e6aa3 | 949 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
14e50e57 DM |
950 | struct dst_entry *new = NULL; |
951 | ||
5c1e6aa3 | 952 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
14e50e57 | 953 | if (rt) { |
cf911662 DM |
954 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
955 | ||
d8d1f30b | 956 | new = &rt->dst; |
14e50e57 | 957 | |
14e50e57 | 958 | new->__use = 1; |
352e512c HX |
959 | new->input = dst_discard; |
960 | new->output = dst_discard; | |
14e50e57 | 961 | |
21efcfa0 ED |
962 | if (dst_metrics_read_only(&ort->dst)) |
963 | new->_metrics = ort->dst._metrics; | |
964 | else | |
965 | dst_copy_metrics(new, &ort->dst); | |
14e50e57 DM |
966 | rt->rt6i_idev = ort->rt6i_idev; |
967 | if (rt->rt6i_idev) | |
968 | in6_dev_hold(rt->rt6i_idev); | |
14e50e57 | 969 | |
4e3fd7a0 | 970 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
971 | rt->rt6i_flags = ort->rt6i_flags; |
972 | rt6_clean_expires(rt); | |
14e50e57 DM |
973 | rt->rt6i_metric = 0; |
974 | ||
975 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
976 | #ifdef CONFIG_IPV6_SUBTREES | |
977 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
978 | #endif | |
979 | ||
980 | dst_free(new); | |
981 | } | |
982 | ||
69ead7af DM |
983 | dst_release(dst_orig); |
984 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 | 985 | } |
14e50e57 | 986 | |
1da177e4 LT |
987 | /* |
988 | * Destination cache support functions | |
989 | */ | |
990 | ||
991 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
992 | { | |
993 | struct rt6_info *rt; | |
994 | ||
995 | rt = (struct rt6_info *) dst; | |
996 | ||
6431cbc2 DM |
997 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
998 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
999 | if (!rt->rt6i_peer) | |
1000 | rt6_bind_peer(rt, 0); | |
1001 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1002 | } | |
1da177e4 | 1003 | return dst; |
6431cbc2 | 1004 | } |
1da177e4 LT |
1005 | return NULL; |
1006 | } | |
1007 | ||
1008 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
1009 | { | |
1010 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1011 | ||
1012 | if (rt) { | |
54c1a859 YH |
1013 | if (rt->rt6i_flags & RTF_CACHE) { |
1014 | if (rt6_check_expired(rt)) { | |
1015 | ip6_del_rt(rt); | |
1016 | dst = NULL; | |
1017 | } | |
1018 | } else { | |
1da177e4 | 1019 | dst_release(dst); |
54c1a859 YH |
1020 | dst = NULL; |
1021 | } | |
1da177e4 | 1022 | } |
54c1a859 | 1023 | return dst; |
1da177e4 LT |
1024 | } |
1025 | ||
1026 | static void ip6_link_failure(struct sk_buff *skb) | |
1027 | { | |
1028 | struct rt6_info *rt; | |
1029 | ||
3ffe533c | 1030 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 1031 | |
adf30907 | 1032 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 | 1033 | if (rt) { |
1716a961 G |
1034 | if (rt->rt6i_flags & RTF_CACHE) |
1035 | rt6_update_expires(rt, 0); | |
1036 | else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
1da177e4 LT |
1037 | rt->rt6i_node->fn_sernum = -1; |
1038 | } | |
1039 | } | |
1040 | ||
1041 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
1042 | { | |
1043 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
1044 | ||
1045 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
1046 | rt6->rt6i_flags |= RTF_MODIFIED; | |
1047 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 1048 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 1049 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
1050 | features |= RTAX_FEATURE_ALLFRAG; |
1051 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 1052 | } |
defb3519 | 1053 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
1054 | } |
1055 | } | |
1056 | ||
0dbaee3b | 1057 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 1058 | { |
0dbaee3b DM |
1059 | struct net_device *dev = dst->dev; |
1060 | unsigned int mtu = dst_mtu(dst); | |
1061 | struct net *net = dev_net(dev); | |
1062 | ||
1da177e4 LT |
1063 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
1064 | ||
5578689a DL |
1065 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
1066 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
1067 | |
1068 | /* | |
1ab1457c YH |
1069 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
1070 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
1071 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
1072 | * rely only on pmtu discovery" |
1073 | */ | |
1074 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1075 | mtu = IPV6_MAXPLEN; | |
1076 | return mtu; | |
1077 | } | |
1078 | ||
ebb762f2 | 1079 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
d33e4553 | 1080 | { |
d33e4553 | 1081 | struct inet6_dev *idev; |
618f9bc7 SK |
1082 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
1083 | ||
1084 | if (mtu) | |
1085 | return mtu; | |
1086 | ||
1087 | mtu = IPV6_MIN_MTU; | |
d33e4553 DM |
1088 | |
1089 | rcu_read_lock(); | |
1090 | idev = __in6_dev_get(dst->dev); | |
1091 | if (idev) | |
1092 | mtu = idev->cnf.mtu6; | |
1093 | rcu_read_unlock(); | |
1094 | ||
1095 | return mtu; | |
1096 | } | |
1097 | ||
3b00944c YH |
1098 | static struct dst_entry *icmp6_dst_gc_list; |
1099 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1100 | |
3b00944c | 1101 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1102 | struct neighbour *neigh, |
87a11578 | 1103 | struct flowi6 *fl6) |
1da177e4 | 1104 | { |
87a11578 | 1105 | struct dst_entry *dst; |
1da177e4 LT |
1106 | struct rt6_info *rt; |
1107 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1108 | struct net *net = dev_net(dev); |
1da177e4 | 1109 | |
38308473 | 1110 | if (unlikely(!idev)) |
122bdf67 | 1111 | return ERR_PTR(-ENODEV); |
1da177e4 | 1112 | |
957c665f | 1113 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0); |
38308473 | 1114 | if (unlikely(!rt)) { |
1da177e4 | 1115 | in6_dev_put(idev); |
87a11578 | 1116 | dst = ERR_PTR(-ENOMEM); |
1da177e4 LT |
1117 | goto out; |
1118 | } | |
1119 | ||
1da177e4 LT |
1120 | if (neigh) |
1121 | neigh_hold(neigh); | |
14deae41 | 1122 | else { |
f83c7790 | 1123 | neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr); |
b43faac6 | 1124 | if (IS_ERR(neigh)) { |
252c3d84 | 1125 | in6_dev_put(idev); |
b43faac6 DM |
1126 | dst_free(&rt->dst); |
1127 | return ERR_CAST(neigh); | |
1128 | } | |
14deae41 | 1129 | } |
1da177e4 | 1130 | |
8e2ec639 YZ |
1131 | rt->dst.flags |= DST_HOST; |
1132 | rt->dst.output = ip6_output; | |
69cce1d1 | 1133 | dst_set_neighbour(&rt->dst, neigh); |
d8d1f30b | 1134 | atomic_set(&rt->dst.__refcnt, 1); |
87a11578 | 1135 | rt->rt6i_dst.addr = fl6->daddr; |
8e2ec639 YZ |
1136 | rt->rt6i_dst.plen = 128; |
1137 | rt->rt6i_idev = idev; | |
7011687f | 1138 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
1da177e4 | 1139 | |
3b00944c | 1140 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1141 | rt->dst.next = icmp6_dst_gc_list; |
1142 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1143 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1144 | |
5578689a | 1145 | fib6_force_start_gc(net); |
1da177e4 | 1146 | |
87a11578 DM |
1147 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
1148 | ||
1da177e4 | 1149 | out: |
87a11578 | 1150 | return dst; |
1da177e4 LT |
1151 | } |
1152 | ||
3d0f24a7 | 1153 | int icmp6_dst_gc(void) |
1da177e4 | 1154 | { |
e9476e95 | 1155 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1156 | int more = 0; |
1da177e4 | 1157 | |
3b00944c YH |
1158 | spin_lock_bh(&icmp6_dst_lock); |
1159 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1160 | |
1da177e4 LT |
1161 | while ((dst = *pprev) != NULL) { |
1162 | if (!atomic_read(&dst->__refcnt)) { | |
1163 | *pprev = dst->next; | |
1164 | dst_free(dst); | |
1da177e4 LT |
1165 | } else { |
1166 | pprev = &dst->next; | |
3d0f24a7 | 1167 | ++more; |
1da177e4 LT |
1168 | } |
1169 | } | |
1170 | ||
3b00944c | 1171 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1172 | |
3d0f24a7 | 1173 | return more; |
1da177e4 LT |
1174 | } |
1175 | ||
1e493d19 DM |
1176 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1177 | void *arg) | |
1178 | { | |
1179 | struct dst_entry *dst, **pprev; | |
1180 | ||
1181 | spin_lock_bh(&icmp6_dst_lock); | |
1182 | pprev = &icmp6_dst_gc_list; | |
1183 | while ((dst = *pprev) != NULL) { | |
1184 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1185 | if (func(rt, arg)) { | |
1186 | *pprev = dst->next; | |
1187 | dst_free(dst); | |
1188 | } else { | |
1189 | pprev = &dst->next; | |
1190 | } | |
1191 | } | |
1192 | spin_unlock_bh(&icmp6_dst_lock); | |
1193 | } | |
1194 | ||
569d3645 | 1195 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1196 | { |
1da177e4 | 1197 | unsigned long now = jiffies; |
86393e52 | 1198 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1199 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1200 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1201 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1202 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1203 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1204 | int entries; |
7019b78e | 1205 | |
fc66f95c | 1206 | entries = dst_entries_get_fast(ops); |
7019b78e | 1207 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1208 | entries <= rt_max_size) |
1da177e4 LT |
1209 | goto out; |
1210 | ||
6891a346 BT |
1211 | net->ipv6.ip6_rt_gc_expire++; |
1212 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1213 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1214 | entries = dst_entries_get_slow(ops); |
1215 | if (entries < ops->gc_thresh) | |
7019b78e | 1216 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1217 | out: |
7019b78e | 1218 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1219 | return entries > rt_max_size; |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1223 | but results in cleaner routing tables. | |
1224 | ||
1225 | Remove it only when all the things will work! | |
1226 | */ | |
1227 | ||
6b75d090 | 1228 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1229 | { |
5170ae82 | 1230 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1231 | if (hoplimit == 0) { |
6b75d090 | 1232 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1233 | struct inet6_dev *idev; |
1234 | ||
1235 | rcu_read_lock(); | |
1236 | idev = __in6_dev_get(dev); | |
1237 | if (idev) | |
6b75d090 | 1238 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1239 | else |
53b7997f | 1240 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1241 | rcu_read_unlock(); |
1da177e4 LT |
1242 | } |
1243 | return hoplimit; | |
1244 | } | |
abbf46ae | 1245 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1246 | |
1247 | /* | |
1248 | * | |
1249 | */ | |
1250 | ||
86872cb5 | 1251 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1252 | { |
1253 | int err; | |
5578689a | 1254 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1255 | struct rt6_info *rt = NULL; |
1256 | struct net_device *dev = NULL; | |
1257 | struct inet6_dev *idev = NULL; | |
c71099ac | 1258 | struct fib6_table *table; |
1da177e4 LT |
1259 | int addr_type; |
1260 | ||
86872cb5 | 1261 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1262 | return -EINVAL; |
1263 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1264 | if (cfg->fc_src_len) |
1da177e4 LT |
1265 | return -EINVAL; |
1266 | #endif | |
86872cb5 | 1267 | if (cfg->fc_ifindex) { |
1da177e4 | 1268 | err = -ENODEV; |
5578689a | 1269 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1270 | if (!dev) |
1271 | goto out; | |
1272 | idev = in6_dev_get(dev); | |
1273 | if (!idev) | |
1274 | goto out; | |
1275 | } | |
1276 | ||
86872cb5 TG |
1277 | if (cfg->fc_metric == 0) |
1278 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1279 | |
d71314b4 | 1280 | err = -ENOBUFS; |
38308473 DM |
1281 | if (cfg->fc_nlinfo.nlh && |
1282 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { | |
d71314b4 | 1283 | table = fib6_get_table(net, cfg->fc_table); |
38308473 | 1284 | if (!table) { |
f3213831 | 1285 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
d71314b4 MV |
1286 | table = fib6_new_table(net, cfg->fc_table); |
1287 | } | |
1288 | } else { | |
1289 | table = fib6_new_table(net, cfg->fc_table); | |
1290 | } | |
38308473 DM |
1291 | |
1292 | if (!table) | |
c71099ac | 1293 | goto out; |
c71099ac | 1294 | |
957c665f | 1295 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT); |
1da177e4 | 1296 | |
38308473 | 1297 | if (!rt) { |
1da177e4 LT |
1298 | err = -ENOMEM; |
1299 | goto out; | |
1300 | } | |
1301 | ||
d8d1f30b | 1302 | rt->dst.obsolete = -1; |
1716a961 G |
1303 | |
1304 | if (cfg->fc_flags & RTF_EXPIRES) | |
1305 | rt6_set_expires(rt, jiffies + | |
1306 | clock_t_to_jiffies(cfg->fc_expires)); | |
1307 | else | |
1308 | rt6_clean_expires(rt); | |
1da177e4 | 1309 | |
86872cb5 TG |
1310 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1311 | cfg->fc_protocol = RTPROT_BOOT; | |
1312 | rt->rt6i_protocol = cfg->fc_protocol; | |
1313 | ||
1314 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1315 | |
1316 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1317 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1318 | else if (cfg->fc_flags & RTF_LOCAL) |
1319 | rt->dst.input = ip6_input; | |
1da177e4 | 1320 | else |
d8d1f30b | 1321 | rt->dst.input = ip6_forward; |
1da177e4 | 1322 | |
d8d1f30b | 1323 | rt->dst.output = ip6_output; |
1da177e4 | 1324 | |
86872cb5 TG |
1325 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1326 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1327 | if (rt->rt6i_dst.plen == 128) |
11d53b49 | 1328 | rt->dst.flags |= DST_HOST; |
1da177e4 | 1329 | |
8e2ec639 YZ |
1330 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
1331 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
1332 | if (!metrics) { | |
1333 | err = -ENOMEM; | |
1334 | goto out; | |
1335 | } | |
1336 | dst_init_metrics(&rt->dst, metrics, 0); | |
1337 | } | |
1da177e4 | 1338 | #ifdef CONFIG_IPV6_SUBTREES |
86872cb5 TG |
1339 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1340 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1341 | #endif |
1342 | ||
86872cb5 | 1343 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1344 | |
1345 | /* We cannot add true routes via loopback here, | |
1346 | they would result in kernel looping; promote them to reject routes | |
1347 | */ | |
86872cb5 | 1348 | if ((cfg->fc_flags & RTF_REJECT) || |
38308473 DM |
1349 | (dev && (dev->flags & IFF_LOOPBACK) && |
1350 | !(addr_type & IPV6_ADDR_LOOPBACK) && | |
1351 | !(cfg->fc_flags & RTF_LOCAL))) { | |
1da177e4 | 1352 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1353 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1354 | if (dev) { |
1355 | dev_put(dev); | |
1356 | in6_dev_put(idev); | |
1357 | } | |
5578689a | 1358 | dev = net->loopback_dev; |
1da177e4 LT |
1359 | dev_hold(dev); |
1360 | idev = in6_dev_get(dev); | |
1361 | if (!idev) { | |
1362 | err = -ENODEV; | |
1363 | goto out; | |
1364 | } | |
1365 | } | |
d8d1f30b CG |
1366 | rt->dst.output = ip6_pkt_discard_out; |
1367 | rt->dst.input = ip6_pkt_discard; | |
1368 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1369 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1370 | goto install_route; | |
1371 | } | |
1372 | ||
86872cb5 | 1373 | if (cfg->fc_flags & RTF_GATEWAY) { |
b71d1d42 | 1374 | const struct in6_addr *gw_addr; |
1da177e4 LT |
1375 | int gwa_type; |
1376 | ||
86872cb5 | 1377 | gw_addr = &cfg->fc_gateway; |
4e3fd7a0 | 1378 | rt->rt6i_gateway = *gw_addr; |
1da177e4 LT |
1379 | gwa_type = ipv6_addr_type(gw_addr); |
1380 | ||
1381 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1382 | struct rt6_info *grt; | |
1383 | ||
1384 | /* IPv6 strictly inhibits using not link-local | |
1385 | addresses as nexthop address. | |
1386 | Otherwise, router will not able to send redirects. | |
1387 | It is very good, but in some (rare!) circumstances | |
1388 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1389 | some exceptions. --ANK | |
1390 | */ | |
1391 | err = -EINVAL; | |
38308473 | 1392 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
1da177e4 LT |
1393 | goto out; |
1394 | ||
5578689a | 1395 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1396 | |
1397 | err = -EHOSTUNREACH; | |
38308473 | 1398 | if (!grt) |
1da177e4 LT |
1399 | goto out; |
1400 | if (dev) { | |
d1918542 | 1401 | if (dev != grt->dst.dev) { |
d8d1f30b | 1402 | dst_release(&grt->dst); |
1da177e4 LT |
1403 | goto out; |
1404 | } | |
1405 | } else { | |
d1918542 | 1406 | dev = grt->dst.dev; |
1da177e4 LT |
1407 | idev = grt->rt6i_idev; |
1408 | dev_hold(dev); | |
1409 | in6_dev_hold(grt->rt6i_idev); | |
1410 | } | |
38308473 | 1411 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
1da177e4 | 1412 | err = 0; |
d8d1f30b | 1413 | dst_release(&grt->dst); |
1da177e4 LT |
1414 | |
1415 | if (err) | |
1416 | goto out; | |
1417 | } | |
1418 | err = -EINVAL; | |
38308473 | 1419 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
1420 | goto out; |
1421 | } | |
1422 | ||
1423 | err = -ENODEV; | |
38308473 | 1424 | if (!dev) |
1da177e4 LT |
1425 | goto out; |
1426 | ||
c3968a85 DW |
1427 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
1428 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { | |
1429 | err = -EINVAL; | |
1430 | goto out; | |
1431 | } | |
4e3fd7a0 | 1432 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
c3968a85 DW |
1433 | rt->rt6i_prefsrc.plen = 128; |
1434 | } else | |
1435 | rt->rt6i_prefsrc.plen = 0; | |
1436 | ||
86872cb5 | 1437 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
8ade06c6 | 1438 | err = rt6_bind_neighbour(rt, dev); |
f83c7790 | 1439 | if (err) |
1da177e4 | 1440 | goto out; |
1da177e4 LT |
1441 | } |
1442 | ||
86872cb5 | 1443 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1444 | |
1445 | install_route: | |
86872cb5 TG |
1446 | if (cfg->fc_mx) { |
1447 | struct nlattr *nla; | |
1448 | int remaining; | |
1449 | ||
1450 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1451 | int type = nla_type(nla); |
86872cb5 TG |
1452 | |
1453 | if (type) { | |
1454 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1455 | err = -EINVAL; |
1456 | goto out; | |
1457 | } | |
86872cb5 | 1458 | |
defb3519 | 1459 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1460 | } |
1da177e4 LT |
1461 | } |
1462 | } | |
1463 | ||
d8d1f30b | 1464 | rt->dst.dev = dev; |
1da177e4 | 1465 | rt->rt6i_idev = idev; |
c71099ac | 1466 | rt->rt6i_table = table; |
63152fc0 | 1467 | |
c346dca1 | 1468 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1469 | |
86872cb5 | 1470 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1471 | |
1472 | out: | |
1473 | if (dev) | |
1474 | dev_put(dev); | |
1475 | if (idev) | |
1476 | in6_dev_put(idev); | |
1477 | if (rt) | |
d8d1f30b | 1478 | dst_free(&rt->dst); |
1da177e4 LT |
1479 | return err; |
1480 | } | |
1481 | ||
86872cb5 | 1482 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1483 | { |
1484 | int err; | |
c71099ac | 1485 | struct fib6_table *table; |
d1918542 | 1486 | struct net *net = dev_net(rt->dst.dev); |
1da177e4 | 1487 | |
8ed67789 | 1488 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1489 | return -ENOENT; |
1490 | ||
c71099ac TG |
1491 | table = rt->rt6i_table; |
1492 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1493 | |
86872cb5 | 1494 | err = fib6_del(rt, info); |
d8d1f30b | 1495 | dst_release(&rt->dst); |
1da177e4 | 1496 | |
c71099ac | 1497 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1498 | |
1499 | return err; | |
1500 | } | |
1501 | ||
e0a1ad73 TG |
1502 | int ip6_del_rt(struct rt6_info *rt) |
1503 | { | |
4d1169c1 | 1504 | struct nl_info info = { |
d1918542 | 1505 | .nl_net = dev_net(rt->dst.dev), |
4d1169c1 | 1506 | }; |
528c4ceb | 1507 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1508 | } |
1509 | ||
86872cb5 | 1510 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1511 | { |
c71099ac | 1512 | struct fib6_table *table; |
1da177e4 LT |
1513 | struct fib6_node *fn; |
1514 | struct rt6_info *rt; | |
1515 | int err = -ESRCH; | |
1516 | ||
5578689a | 1517 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
38308473 | 1518 | if (!table) |
c71099ac TG |
1519 | return err; |
1520 | ||
1521 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1522 | |
c71099ac | 1523 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1524 | &cfg->fc_dst, cfg->fc_dst_len, |
1525 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1526 | |
1da177e4 | 1527 | if (fn) { |
d8d1f30b | 1528 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1529 | if (cfg->fc_ifindex && |
d1918542 DM |
1530 | (!rt->dst.dev || |
1531 | rt->dst.dev->ifindex != cfg->fc_ifindex)) | |
1da177e4 | 1532 | continue; |
86872cb5 TG |
1533 | if (cfg->fc_flags & RTF_GATEWAY && |
1534 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1535 | continue; |
86872cb5 | 1536 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1537 | continue; |
d8d1f30b | 1538 | dst_hold(&rt->dst); |
c71099ac | 1539 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1540 | |
86872cb5 | 1541 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1542 | } |
1543 | } | |
c71099ac | 1544 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1545 | |
1546 | return err; | |
1547 | } | |
1548 | ||
1549 | /* | |
1550 | * Handle redirects | |
1551 | */ | |
a6279458 | 1552 | struct ip6rd_flowi { |
4c9483b2 | 1553 | struct flowi6 fl6; |
a6279458 YH |
1554 | struct in6_addr gateway; |
1555 | }; | |
1556 | ||
8ed67789 DL |
1557 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1558 | struct fib6_table *table, | |
4c9483b2 | 1559 | struct flowi6 *fl6, |
a6279458 | 1560 | int flags) |
1da177e4 | 1561 | { |
4c9483b2 | 1562 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; |
a6279458 | 1563 | struct rt6_info *rt; |
e843b9e1 | 1564 | struct fib6_node *fn; |
c71099ac | 1565 | |
1da177e4 | 1566 | /* |
e843b9e1 YH |
1567 | * Get the "current" route for this destination and |
1568 | * check if the redirect has come from approriate router. | |
1569 | * | |
1570 | * RFC 2461 specifies that redirects should only be | |
1571 | * accepted if they come from the nexthop to the target. | |
1572 | * Due to the way the routes are chosen, this notion | |
1573 | * is a bit fuzzy and one might need to check all possible | |
1574 | * routes. | |
1da177e4 | 1575 | */ |
1da177e4 | 1576 | |
c71099ac | 1577 | read_lock_bh(&table->tb6_lock); |
4c9483b2 | 1578 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
e843b9e1 | 1579 | restart: |
d8d1f30b | 1580 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1581 | /* |
1582 | * Current route is on-link; redirect is always invalid. | |
1583 | * | |
1584 | * Seems, previous statement is not true. It could | |
1585 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1586 | * But then router serving it might decide, that we should | |
1587 | * know truth 8)8) --ANK (980726). | |
1588 | */ | |
1589 | if (rt6_check_expired(rt)) | |
1590 | continue; | |
1591 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1592 | continue; | |
d1918542 | 1593 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) |
e843b9e1 | 1594 | continue; |
a6279458 | 1595 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1596 | continue; |
1597 | break; | |
1598 | } | |
a6279458 | 1599 | |
cb15d9c2 | 1600 | if (!rt) |
8ed67789 | 1601 | rt = net->ipv6.ip6_null_entry; |
4c9483b2 | 1602 | BACKTRACK(net, &fl6->saddr); |
cb15d9c2 | 1603 | out: |
d8d1f30b | 1604 | dst_hold(&rt->dst); |
a6279458 | 1605 | |
c71099ac | 1606 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1607 | |
a6279458 YH |
1608 | return rt; |
1609 | }; | |
1610 | ||
b71d1d42 ED |
1611 | static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest, |
1612 | const struct in6_addr *src, | |
1613 | const struct in6_addr *gateway, | |
a6279458 YH |
1614 | struct net_device *dev) |
1615 | { | |
adaa70bb | 1616 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1617 | struct net *net = dev_net(dev); |
a6279458 | 1618 | struct ip6rd_flowi rdfl = { |
4c9483b2 DM |
1619 | .fl6 = { |
1620 | .flowi6_oif = dev->ifindex, | |
1621 | .daddr = *dest, | |
1622 | .saddr = *src, | |
a6279458 | 1623 | }, |
a6279458 | 1624 | }; |
adaa70bb | 1625 | |
4e3fd7a0 | 1626 | rdfl.gateway = *gateway; |
86c36ce4 | 1627 | |
adaa70bb TG |
1628 | if (rt6_need_strict(dest)) |
1629 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1630 | |
4c9483b2 | 1631 | return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6, |
58f09b78 | 1632 | flags, __ip6_route_redirect); |
a6279458 YH |
1633 | } |
1634 | ||
b71d1d42 ED |
1635 | void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src, |
1636 | const struct in6_addr *saddr, | |
a6279458 YH |
1637 | struct neighbour *neigh, u8 *lladdr, int on_link) |
1638 | { | |
1639 | struct rt6_info *rt, *nrt = NULL; | |
1640 | struct netevent_redirect netevent; | |
c346dca1 | 1641 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1642 | |
1643 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1644 | ||
8ed67789 | 1645 | if (rt == net->ipv6.ip6_null_entry) { |
e87cc472 | 1646 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
a6279458 | 1647 | goto out; |
1da177e4 LT |
1648 | } |
1649 | ||
1da177e4 LT |
1650 | /* |
1651 | * We have finally decided to accept it. | |
1652 | */ | |
1653 | ||
1ab1457c | 1654 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1655 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1656 | NEIGH_UPDATE_F_OVERRIDE| | |
1657 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1658 | NEIGH_UPDATE_F_ISROUTER)) | |
1659 | ); | |
1660 | ||
1661 | /* | |
1662 | * Redirect received -> path was valid. | |
1663 | * Look, redirects are sent only in response to data packets, | |
1664 | * so that this nexthop apparently is reachable. --ANK | |
1665 | */ | |
d8d1f30b | 1666 | dst_confirm(&rt->dst); |
1da177e4 LT |
1667 | |
1668 | /* Duplicate redirect: silently ignore. */ | |
27217455 | 1669 | if (neigh == dst_get_neighbour_noref_raw(&rt->dst)) |
1da177e4 LT |
1670 | goto out; |
1671 | ||
21efcfa0 | 1672 | nrt = ip6_rt_copy(rt, dest); |
38308473 | 1673 | if (!nrt) |
1da177e4 LT |
1674 | goto out; |
1675 | ||
1676 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1677 | if (on_link) | |
1678 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1679 | ||
4e3fd7a0 | 1680 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
69cce1d1 | 1681 | dst_set_neighbour(&nrt->dst, neigh_clone(neigh)); |
1da177e4 | 1682 | |
40e22e8f | 1683 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1684 | goto out; |
1685 | ||
d8d1f30b CG |
1686 | netevent.old = &rt->dst; |
1687 | netevent.new = &nrt->dst; | |
8d71740c TT |
1688 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1689 | ||
38308473 | 1690 | if (rt->rt6i_flags & RTF_CACHE) { |
e0a1ad73 | 1691 | ip6_del_rt(rt); |
1da177e4 LT |
1692 | return; |
1693 | } | |
1694 | ||
1695 | out: | |
d8d1f30b | 1696 | dst_release(&rt->dst); |
1da177e4 LT |
1697 | } |
1698 | ||
1699 | /* | |
1700 | * Handle ICMP "packet too big" messages | |
1701 | * i.e. Path MTU discovery | |
1702 | */ | |
1703 | ||
b71d1d42 | 1704 | static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 | 1705 | struct net *net, u32 pmtu, int ifindex) |
1da177e4 LT |
1706 | { |
1707 | struct rt6_info *rt, *nrt; | |
1708 | int allfrag = 0; | |
d3052b55 | 1709 | again: |
ae878ae2 | 1710 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
38308473 | 1711 | if (!rt) |
1da177e4 LT |
1712 | return; |
1713 | ||
d3052b55 AV |
1714 | if (rt6_check_expired(rt)) { |
1715 | ip6_del_rt(rt); | |
1716 | goto again; | |
1717 | } | |
1718 | ||
d8d1f30b | 1719 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1720 | goto out; |
1721 | ||
1722 | if (pmtu < IPV6_MIN_MTU) { | |
1723 | /* | |
1ab1457c | 1724 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1725 | * MTU (1280) and a fragment header should always be included |
1726 | * after a node receiving Too Big message reporting PMTU is | |
1727 | * less than the IPv6 Minimum Link MTU. | |
1728 | */ | |
1729 | pmtu = IPV6_MIN_MTU; | |
1730 | allfrag = 1; | |
1731 | } | |
1732 | ||
1733 | /* New mtu received -> path was valid. | |
1734 | They are sent only in response to data packets, | |
1735 | so that this nexthop apparently is reachable. --ANK | |
1736 | */ | |
d8d1f30b | 1737 | dst_confirm(&rt->dst); |
1da177e4 LT |
1738 | |
1739 | /* Host route. If it is static, it would be better | |
1740 | not to override it, but add new one, so that | |
1741 | when cache entry will expire old pmtu | |
1742 | would return automatically. | |
1743 | */ | |
1744 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1745 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1746 | if (allfrag) { | |
1747 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1748 | features |= RTAX_FEATURE_ALLFRAG; | |
1749 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1750 | } | |
1716a961 G |
1751 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1752 | rt->rt6i_flags |= RTF_MODIFIED; | |
1da177e4 LT |
1753 | goto out; |
1754 | } | |
1755 | ||
1756 | /* Network route. | |
1757 | Two cases are possible: | |
1758 | 1. It is connected route. Action: COW | |
1759 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1760 | */ | |
27217455 | 1761 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1762 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1763 | else |
1764 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1765 | |
d5315b50 | 1766 | if (nrt) { |
defb3519 DM |
1767 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1768 | if (allfrag) { | |
1769 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1770 | features |= RTAX_FEATURE_ALLFRAG; | |
1771 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1772 | } | |
a1e78363 YH |
1773 | |
1774 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1775 | * happened within 5 mins, the recommended timer is 10 mins. | |
1776 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1777 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1778 | * and detecting PMTU increase will be automatically happened. | |
1779 | */ | |
1716a961 G |
1780 | rt6_update_expires(nrt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1781 | nrt->rt6i_flags |= RTF_DYNAMIC; | |
40e22e8f | 1782 | ip6_ins_rt(nrt); |
1da177e4 | 1783 | } |
1da177e4 | 1784 | out: |
d8d1f30b | 1785 | dst_release(&rt->dst); |
1da177e4 LT |
1786 | } |
1787 | ||
b71d1d42 | 1788 | void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr, |
ae878ae2 MŻ |
1789 | struct net_device *dev, u32 pmtu) |
1790 | { | |
1791 | struct net *net = dev_net(dev); | |
1792 | ||
1793 | /* | |
1794 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1795 | * is sending along the path" that caused the Packet Too Big message. | |
1796 | * Since it's not possible in the general case to determine which | |
1797 | * interface was used to send the original packet, we update the MTU | |
1798 | * on the interface that will be used to send future packets. We also | |
1799 | * update the MTU on the interface that received the Packet Too Big in | |
1800 | * case the original packet was forced out that interface with | |
1801 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1802 | * correct behaviour, which would be to update the MTU on all | |
1803 | * interfaces. | |
1804 | */ | |
1805 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1806 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1807 | } | |
1808 | ||
1da177e4 LT |
1809 | /* |
1810 | * Misc support functions | |
1811 | */ | |
1812 | ||
1716a961 | 1813 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
21efcfa0 | 1814 | const struct in6_addr *dest) |
1da177e4 | 1815 | { |
d1918542 | 1816 | struct net *net = dev_net(ort->dst.dev); |
5c1e6aa3 | 1817 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 1818 | ort->dst.dev, 0); |
1da177e4 LT |
1819 | |
1820 | if (rt) { | |
d8d1f30b CG |
1821 | rt->dst.input = ort->dst.input; |
1822 | rt->dst.output = ort->dst.output; | |
8e2ec639 | 1823 | rt->dst.flags |= DST_HOST; |
d8d1f30b | 1824 | |
4e3fd7a0 | 1825 | rt->rt6i_dst.addr = *dest; |
8e2ec639 | 1826 | rt->rt6i_dst.plen = 128; |
defb3519 | 1827 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b | 1828 | rt->dst.error = ort->dst.error; |
1da177e4 LT |
1829 | rt->rt6i_idev = ort->rt6i_idev; |
1830 | if (rt->rt6i_idev) | |
1831 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1832 | rt->dst.lastuse = jiffies; |
1da177e4 | 1833 | |
4e3fd7a0 | 1834 | rt->rt6i_gateway = ort->rt6i_gateway; |
1716a961 G |
1835 | rt->rt6i_flags = ort->rt6i_flags; |
1836 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == | |
1837 | (RTF_DEFAULT | RTF_ADDRCONF)) | |
1838 | rt6_set_from(rt, ort); | |
1839 | else | |
1840 | rt6_clean_expires(rt); | |
1da177e4 LT |
1841 | rt->rt6i_metric = 0; |
1842 | ||
1da177e4 LT |
1843 | #ifdef CONFIG_IPV6_SUBTREES |
1844 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1845 | #endif | |
0f6c6392 | 1846 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
c71099ac | 1847 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1848 | } |
1849 | return rt; | |
1850 | } | |
1851 | ||
70ceb4f5 | 1852 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 | 1853 | static struct rt6_info *rt6_get_route_info(struct net *net, |
b71d1d42 ED |
1854 | const struct in6_addr *prefix, int prefixlen, |
1855 | const struct in6_addr *gwaddr, int ifindex) | |
70ceb4f5 YH |
1856 | { |
1857 | struct fib6_node *fn; | |
1858 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1859 | struct fib6_table *table; |
1860 | ||
efa2cea0 | 1861 | table = fib6_get_table(net, RT6_TABLE_INFO); |
38308473 | 1862 | if (!table) |
c71099ac | 1863 | return NULL; |
70ceb4f5 | 1864 | |
c71099ac TG |
1865 | write_lock_bh(&table->tb6_lock); |
1866 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1867 | if (!fn) |
1868 | goto out; | |
1869 | ||
d8d1f30b | 1870 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
d1918542 | 1871 | if (rt->dst.dev->ifindex != ifindex) |
70ceb4f5 YH |
1872 | continue; |
1873 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1874 | continue; | |
1875 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1876 | continue; | |
d8d1f30b | 1877 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1878 | break; |
1879 | } | |
1880 | out: | |
c71099ac | 1881 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1882 | return rt; |
1883 | } | |
1884 | ||
efa2cea0 | 1885 | static struct rt6_info *rt6_add_route_info(struct net *net, |
b71d1d42 ED |
1886 | const struct in6_addr *prefix, int prefixlen, |
1887 | const struct in6_addr *gwaddr, int ifindex, | |
95c96174 | 1888 | unsigned int pref) |
70ceb4f5 | 1889 | { |
86872cb5 TG |
1890 | struct fib6_config cfg = { |
1891 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1892 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1893 | .fc_ifindex = ifindex, |
1894 | .fc_dst_len = prefixlen, | |
1895 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1896 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1897 | .fc_nlinfo.pid = 0, |
1898 | .fc_nlinfo.nlh = NULL, | |
1899 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1900 | }; |
1901 | ||
4e3fd7a0 AD |
1902 | cfg.fc_dst = *prefix; |
1903 | cfg.fc_gateway = *gwaddr; | |
70ceb4f5 | 1904 | |
e317da96 YH |
1905 | /* We should treat it as a default route if prefix length is 0. */ |
1906 | if (!prefixlen) | |
86872cb5 | 1907 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1908 | |
86872cb5 | 1909 | ip6_route_add(&cfg); |
70ceb4f5 | 1910 | |
efa2cea0 | 1911 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1912 | } |
1913 | #endif | |
1914 | ||
b71d1d42 | 1915 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1916 | { |
1da177e4 | 1917 | struct rt6_info *rt; |
c71099ac | 1918 | struct fib6_table *table; |
1da177e4 | 1919 | |
c346dca1 | 1920 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
38308473 | 1921 | if (!table) |
c71099ac | 1922 | return NULL; |
1da177e4 | 1923 | |
c71099ac | 1924 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1925 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
d1918542 | 1926 | if (dev == rt->dst.dev && |
045927ff | 1927 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1928 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1929 | break; | |
1930 | } | |
1931 | if (rt) | |
d8d1f30b | 1932 | dst_hold(&rt->dst); |
c71099ac | 1933 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1934 | return rt; |
1935 | } | |
1936 | ||
b71d1d42 | 1937 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
ebacaaa0 YH |
1938 | struct net_device *dev, |
1939 | unsigned int pref) | |
1da177e4 | 1940 | { |
86872cb5 TG |
1941 | struct fib6_config cfg = { |
1942 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1943 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1944 | .fc_ifindex = dev->ifindex, |
1945 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1946 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1947 | .fc_nlinfo.pid = 0, |
1948 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1949 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1950 | }; |
1da177e4 | 1951 | |
4e3fd7a0 | 1952 | cfg.fc_gateway = *gwaddr; |
1da177e4 | 1953 | |
86872cb5 | 1954 | ip6_route_add(&cfg); |
1da177e4 | 1955 | |
1da177e4 LT |
1956 | return rt6_get_dflt_router(gwaddr, dev); |
1957 | } | |
1958 | ||
7b4da532 | 1959 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1960 | { |
1961 | struct rt6_info *rt; | |
c71099ac TG |
1962 | struct fib6_table *table; |
1963 | ||
1964 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1965 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
38308473 | 1966 | if (!table) |
c71099ac | 1967 | return; |
1da177e4 LT |
1968 | |
1969 | restart: | |
c71099ac | 1970 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1971 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1972 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1973 | dst_hold(&rt->dst); |
c71099ac | 1974 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1975 | ip6_del_rt(rt); |
1da177e4 LT |
1976 | goto restart; |
1977 | } | |
1978 | } | |
c71099ac | 1979 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1980 | } |
1981 | ||
5578689a DL |
1982 | static void rtmsg_to_fib6_config(struct net *net, |
1983 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1984 | struct fib6_config *cfg) |
1985 | { | |
1986 | memset(cfg, 0, sizeof(*cfg)); | |
1987 | ||
1988 | cfg->fc_table = RT6_TABLE_MAIN; | |
1989 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1990 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1991 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1992 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1993 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1994 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1995 | ||
5578689a | 1996 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1997 | |
4e3fd7a0 AD |
1998 | cfg->fc_dst = rtmsg->rtmsg_dst; |
1999 | cfg->fc_src = rtmsg->rtmsg_src; | |
2000 | cfg->fc_gateway = rtmsg->rtmsg_gateway; | |
86872cb5 TG |
2001 | } |
2002 | ||
5578689a | 2003 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 2004 | { |
86872cb5 | 2005 | struct fib6_config cfg; |
1da177e4 LT |
2006 | struct in6_rtmsg rtmsg; |
2007 | int err; | |
2008 | ||
2009 | switch(cmd) { | |
2010 | case SIOCADDRT: /* Add a route */ | |
2011 | case SIOCDELRT: /* Delete a route */ | |
2012 | if (!capable(CAP_NET_ADMIN)) | |
2013 | return -EPERM; | |
2014 | err = copy_from_user(&rtmsg, arg, | |
2015 | sizeof(struct in6_rtmsg)); | |
2016 | if (err) | |
2017 | return -EFAULT; | |
86872cb5 | 2018 | |
5578689a | 2019 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 2020 | |
1da177e4 LT |
2021 | rtnl_lock(); |
2022 | switch (cmd) { | |
2023 | case SIOCADDRT: | |
86872cb5 | 2024 | err = ip6_route_add(&cfg); |
1da177e4 LT |
2025 | break; |
2026 | case SIOCDELRT: | |
86872cb5 | 2027 | err = ip6_route_del(&cfg); |
1da177e4 LT |
2028 | break; |
2029 | default: | |
2030 | err = -EINVAL; | |
2031 | } | |
2032 | rtnl_unlock(); | |
2033 | ||
2034 | return err; | |
3ff50b79 | 2035 | } |
1da177e4 LT |
2036 | |
2037 | return -EINVAL; | |
2038 | } | |
2039 | ||
2040 | /* | |
2041 | * Drop the packet on the floor | |
2042 | */ | |
2043 | ||
d5fdd6ba | 2044 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 2045 | { |
612f09e8 | 2046 | int type; |
adf30907 | 2047 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
2048 | switch (ipstats_mib_noroutes) { |
2049 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 2050 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 2051 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
2052 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2053 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
2054 | break; |
2055 | } | |
2056 | /* FALLTHROUGH */ | |
2057 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
2058 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
2059 | ipstats_mib_noroutes); | |
612f09e8 YH |
2060 | break; |
2061 | } | |
3ffe533c | 2062 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
2063 | kfree_skb(skb); |
2064 | return 0; | |
2065 | } | |
2066 | ||
9ce8ade0 TG |
2067 | static int ip6_pkt_discard(struct sk_buff *skb) |
2068 | { | |
612f09e8 | 2069 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2070 | } |
2071 | ||
20380731 | 2072 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 2073 | { |
adf30907 | 2074 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2075 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
2076 | } |
2077 | ||
6723ab54 DM |
2078 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2079 | ||
9ce8ade0 TG |
2080 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
2081 | { | |
612f09e8 | 2082 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
2083 | } |
2084 | ||
2085 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
2086 | { | |
adf30907 | 2087 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 2088 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
2089 | } |
2090 | ||
6723ab54 DM |
2091 | #endif |
2092 | ||
1da177e4 LT |
2093 | /* |
2094 | * Allocate a dst for local (unicast / anycast) address. | |
2095 | */ | |
2096 | ||
2097 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
2098 | const struct in6_addr *addr, | |
8f031519 | 2099 | bool anycast) |
1da177e4 | 2100 | { |
c346dca1 | 2101 | struct net *net = dev_net(idev->dev); |
5c1e6aa3 | 2102 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
957c665f | 2103 | net->loopback_dev, 0); |
f83c7790 | 2104 | int err; |
1da177e4 | 2105 | |
38308473 | 2106 | if (!rt) { |
f3213831 | 2107 | net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
1da177e4 | 2108 | return ERR_PTR(-ENOMEM); |
40385653 | 2109 | } |
1da177e4 | 2110 | |
1da177e4 LT |
2111 | in6_dev_hold(idev); |
2112 | ||
11d53b49 | 2113 | rt->dst.flags |= DST_HOST; |
d8d1f30b CG |
2114 | rt->dst.input = ip6_input; |
2115 | rt->dst.output = ip6_output; | |
1da177e4 | 2116 | rt->rt6i_idev = idev; |
d8d1f30b | 2117 | rt->dst.obsolete = -1; |
1da177e4 LT |
2118 | |
2119 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2120 | if (anycast) |
2121 | rt->rt6i_flags |= RTF_ANYCAST; | |
2122 | else | |
1da177e4 | 2123 | rt->rt6i_flags |= RTF_LOCAL; |
8ade06c6 | 2124 | err = rt6_bind_neighbour(rt, rt->dst.dev); |
f83c7790 | 2125 | if (err) { |
d8d1f30b | 2126 | dst_free(&rt->dst); |
f83c7790 | 2127 | return ERR_PTR(err); |
1da177e4 LT |
2128 | } |
2129 | ||
4e3fd7a0 | 2130 | rt->rt6i_dst.addr = *addr; |
1da177e4 | 2131 | rt->rt6i_dst.plen = 128; |
5578689a | 2132 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2133 | |
d8d1f30b | 2134 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2135 | |
2136 | return rt; | |
2137 | } | |
2138 | ||
c3968a85 DW |
2139 | int ip6_route_get_saddr(struct net *net, |
2140 | struct rt6_info *rt, | |
b71d1d42 | 2141 | const struct in6_addr *daddr, |
c3968a85 DW |
2142 | unsigned int prefs, |
2143 | struct in6_addr *saddr) | |
2144 | { | |
2145 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); | |
2146 | int err = 0; | |
2147 | if (rt->rt6i_prefsrc.plen) | |
4e3fd7a0 | 2148 | *saddr = rt->rt6i_prefsrc.addr; |
c3968a85 DW |
2149 | else |
2150 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, | |
2151 | daddr, prefs, saddr); | |
2152 | return err; | |
2153 | } | |
2154 | ||
2155 | /* remove deleted ip from prefsrc entries */ | |
2156 | struct arg_dev_net_ip { | |
2157 | struct net_device *dev; | |
2158 | struct net *net; | |
2159 | struct in6_addr *addr; | |
2160 | }; | |
2161 | ||
2162 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) | |
2163 | { | |
2164 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; | |
2165 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; | |
2166 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; | |
2167 | ||
d1918542 | 2168 | if (((void *)rt->dst.dev == dev || !dev) && |
c3968a85 DW |
2169 | rt != net->ipv6.ip6_null_entry && |
2170 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { | |
2171 | /* remove prefsrc entry */ | |
2172 | rt->rt6i_prefsrc.plen = 0; | |
2173 | } | |
2174 | return 0; | |
2175 | } | |
2176 | ||
2177 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) | |
2178 | { | |
2179 | struct net *net = dev_net(ifp->idev->dev); | |
2180 | struct arg_dev_net_ip adni = { | |
2181 | .dev = ifp->idev->dev, | |
2182 | .net = net, | |
2183 | .addr = &ifp->addr, | |
2184 | }; | |
2185 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); | |
2186 | } | |
2187 | ||
8ed67789 DL |
2188 | struct arg_dev_net { |
2189 | struct net_device *dev; | |
2190 | struct net *net; | |
2191 | }; | |
2192 | ||
1da177e4 LT |
2193 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2194 | { | |
bc3ef660 | 2195 | const struct arg_dev_net *adn = arg; |
2196 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2197 | |
d1918542 | 2198 | if ((rt->dst.dev == dev || !dev) && |
c159d30c | 2199 | rt != adn->net->ipv6.ip6_null_entry) |
1da177e4 | 2200 | return -1; |
c159d30c | 2201 | |
1da177e4 LT |
2202 | return 0; |
2203 | } | |
2204 | ||
f3db4851 | 2205 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2206 | { |
8ed67789 DL |
2207 | struct arg_dev_net adn = { |
2208 | .dev = dev, | |
2209 | .net = net, | |
2210 | }; | |
2211 | ||
2212 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2213 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2214 | } |
2215 | ||
95c96174 | 2216 | struct rt6_mtu_change_arg { |
1da177e4 | 2217 | struct net_device *dev; |
95c96174 | 2218 | unsigned int mtu; |
1da177e4 LT |
2219 | }; |
2220 | ||
2221 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2222 | { | |
2223 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2224 | struct inet6_dev *idev; | |
2225 | ||
2226 | /* In IPv6 pmtu discovery is not optional, | |
2227 | so that RTAX_MTU lock cannot disable it. | |
2228 | We still use this lock to block changes | |
2229 | caused by addrconf/ndisc. | |
2230 | */ | |
2231 | ||
2232 | idev = __in6_dev_get(arg->dev); | |
38308473 | 2233 | if (!idev) |
1da177e4 LT |
2234 | return 0; |
2235 | ||
2236 | /* For administrative MTU increase, there is no way to discover | |
2237 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2238 | Since RFC 1981 doesn't include administrative MTU increase | |
2239 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2240 | */ | |
2241 | /* | |
2242 | If new MTU is less than route PMTU, this new MTU will be the | |
2243 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2244 | decreases; if new MTU is greater than route PMTU, and the | |
2245 | old MTU is the lowest MTU in the path, update the route PMTU | |
2246 | to reflect the increase. In this case if the other nodes' MTU | |
2247 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2248 | PMTU discouvery. | |
2249 | */ | |
d1918542 | 2250 | if (rt->dst.dev == arg->dev && |
d8d1f30b CG |
2251 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2252 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2253 | (dst_mtu(&rt->dst) < arg->mtu && | |
2254 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2255 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2256 | } |
1da177e4 LT |
2257 | return 0; |
2258 | } | |
2259 | ||
95c96174 | 2260 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
1da177e4 | 2261 | { |
c71099ac TG |
2262 | struct rt6_mtu_change_arg arg = { |
2263 | .dev = dev, | |
2264 | .mtu = mtu, | |
2265 | }; | |
1da177e4 | 2266 | |
c346dca1 | 2267 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2268 | } |
2269 | ||
ef7c79ed | 2270 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2271 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2272 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2273 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2274 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2275 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2276 | }; | |
2277 | ||
2278 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2279 | struct fib6_config *cfg) | |
1da177e4 | 2280 | { |
86872cb5 TG |
2281 | struct rtmsg *rtm; |
2282 | struct nlattr *tb[RTA_MAX+1]; | |
2283 | int err; | |
1da177e4 | 2284 | |
86872cb5 TG |
2285 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2286 | if (err < 0) | |
2287 | goto errout; | |
1da177e4 | 2288 | |
86872cb5 TG |
2289 | err = -EINVAL; |
2290 | rtm = nlmsg_data(nlh); | |
2291 | memset(cfg, 0, sizeof(*cfg)); | |
2292 | ||
2293 | cfg->fc_table = rtm->rtm_table; | |
2294 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2295 | cfg->fc_src_len = rtm->rtm_src_len; | |
2296 | cfg->fc_flags = RTF_UP; | |
2297 | cfg->fc_protocol = rtm->rtm_protocol; | |
2298 | ||
2299 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2300 | cfg->fc_flags |= RTF_REJECT; | |
2301 | ||
ab79ad14 MŻ |
2302 | if (rtm->rtm_type == RTN_LOCAL) |
2303 | cfg->fc_flags |= RTF_LOCAL; | |
2304 | ||
86872cb5 TG |
2305 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2306 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2307 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2308 | |
2309 | if (tb[RTA_GATEWAY]) { | |
2310 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2311 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2312 | } |
86872cb5 TG |
2313 | |
2314 | if (tb[RTA_DST]) { | |
2315 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2316 | ||
2317 | if (nla_len(tb[RTA_DST]) < plen) | |
2318 | goto errout; | |
2319 | ||
2320 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2321 | } |
86872cb5 TG |
2322 | |
2323 | if (tb[RTA_SRC]) { | |
2324 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2325 | ||
2326 | if (nla_len(tb[RTA_SRC]) < plen) | |
2327 | goto errout; | |
2328 | ||
2329 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2330 | } |
86872cb5 | 2331 | |
c3968a85 DW |
2332 | if (tb[RTA_PREFSRC]) |
2333 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); | |
2334 | ||
86872cb5 TG |
2335 | if (tb[RTA_OIF]) |
2336 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2337 | ||
2338 | if (tb[RTA_PRIORITY]) | |
2339 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2340 | ||
2341 | if (tb[RTA_METRICS]) { | |
2342 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2343 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2344 | } |
86872cb5 TG |
2345 | |
2346 | if (tb[RTA_TABLE]) | |
2347 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2348 | ||
2349 | err = 0; | |
2350 | errout: | |
2351 | return err; | |
1da177e4 LT |
2352 | } |
2353 | ||
c127ea2c | 2354 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2355 | { |
86872cb5 TG |
2356 | struct fib6_config cfg; |
2357 | int err; | |
1da177e4 | 2358 | |
86872cb5 TG |
2359 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2360 | if (err < 0) | |
2361 | return err; | |
2362 | ||
2363 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2364 | } |
2365 | ||
c127ea2c | 2366 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2367 | { |
86872cb5 TG |
2368 | struct fib6_config cfg; |
2369 | int err; | |
1da177e4 | 2370 | |
86872cb5 TG |
2371 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2372 | if (err < 0) | |
2373 | return err; | |
2374 | ||
2375 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2376 | } |
2377 | ||
339bf98f TG |
2378 | static inline size_t rt6_nlmsg_size(void) |
2379 | { | |
2380 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2381 | + nla_total_size(16) /* RTA_SRC */ | |
2382 | + nla_total_size(16) /* RTA_DST */ | |
2383 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2384 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2385 | + nla_total_size(4) /* RTA_TABLE */ | |
2386 | + nla_total_size(4) /* RTA_IIF */ | |
2387 | + nla_total_size(4) /* RTA_OIF */ | |
2388 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2389 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2390 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2391 | } | |
2392 | ||
191cd582 BH |
2393 | static int rt6_fill_node(struct net *net, |
2394 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2395 | struct in6_addr *dst, struct in6_addr *src, |
2396 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2397 | int prefix, int nowait, unsigned int flags) |
1da177e4 | 2398 | { |
346f870b | 2399 | const struct inet_peer *peer; |
1da177e4 | 2400 | struct rtmsg *rtm; |
2d7202bf | 2401 | struct nlmsghdr *nlh; |
e3703b3d | 2402 | long expires; |
9e762a4a | 2403 | u32 table; |
f2c31e32 | 2404 | struct neighbour *n; |
346f870b | 2405 | u32 ts, tsage; |
1da177e4 LT |
2406 | |
2407 | if (prefix) { /* user wants prefix routes only */ | |
2408 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2409 | /* success since this is not a prefix route */ | |
2410 | return 1; | |
2411 | } | |
2412 | } | |
2413 | ||
2d7202bf | 2414 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
38308473 | 2415 | if (!nlh) |
26932566 | 2416 | return -EMSGSIZE; |
2d7202bf TG |
2417 | |
2418 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2419 | rtm->rtm_family = AF_INET6; |
2420 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2421 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2422 | rtm->rtm_tos = 0; | |
c71099ac | 2423 | if (rt->rt6i_table) |
9e762a4a | 2424 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2425 | else |
9e762a4a PM |
2426 | table = RT6_TABLE_UNSPEC; |
2427 | rtm->rtm_table = table; | |
c78679e8 DM |
2428 | if (nla_put_u32(skb, RTA_TABLE, table)) |
2429 | goto nla_put_failure; | |
38308473 | 2430 | if (rt->rt6i_flags & RTF_REJECT) |
1da177e4 | 2431 | rtm->rtm_type = RTN_UNREACHABLE; |
38308473 | 2432 | else if (rt->rt6i_flags & RTF_LOCAL) |
ab79ad14 | 2433 | rtm->rtm_type = RTN_LOCAL; |
d1918542 | 2434 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
1da177e4 LT |
2435 | rtm->rtm_type = RTN_LOCAL; |
2436 | else | |
2437 | rtm->rtm_type = RTN_UNICAST; | |
2438 | rtm->rtm_flags = 0; | |
2439 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2440 | rtm->rtm_protocol = rt->rt6i_protocol; | |
38308473 | 2441 | if (rt->rt6i_flags & RTF_DYNAMIC) |
1da177e4 LT |
2442 | rtm->rtm_protocol = RTPROT_REDIRECT; |
2443 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2444 | rtm->rtm_protocol = RTPROT_KERNEL; | |
38308473 | 2445 | else if (rt->rt6i_flags & RTF_DEFAULT) |
1da177e4 LT |
2446 | rtm->rtm_protocol = RTPROT_RA; |
2447 | ||
38308473 | 2448 | if (rt->rt6i_flags & RTF_CACHE) |
1da177e4 LT |
2449 | rtm->rtm_flags |= RTM_F_CLONED; |
2450 | ||
2451 | if (dst) { | |
c78679e8 DM |
2452 | if (nla_put(skb, RTA_DST, 16, dst)) |
2453 | goto nla_put_failure; | |
1ab1457c | 2454 | rtm->rtm_dst_len = 128; |
1da177e4 | 2455 | } else if (rtm->rtm_dst_len) |
c78679e8 DM |
2456 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
2457 | goto nla_put_failure; | |
1da177e4 LT |
2458 | #ifdef CONFIG_IPV6_SUBTREES |
2459 | if (src) { | |
c78679e8 DM |
2460 | if (nla_put(skb, RTA_SRC, 16, src)) |
2461 | goto nla_put_failure; | |
1ab1457c | 2462 | rtm->rtm_src_len = 128; |
c78679e8 DM |
2463 | } else if (rtm->rtm_src_len && |
2464 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) | |
2465 | goto nla_put_failure; | |
1da177e4 | 2466 | #endif |
7bc570c8 YH |
2467 | if (iif) { |
2468 | #ifdef CONFIG_IPV6_MROUTE | |
2469 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2470 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2471 | if (err <= 0) { |
2472 | if (!nowait) { | |
2473 | if (err == 0) | |
2474 | return 0; | |
2475 | goto nla_put_failure; | |
2476 | } else { | |
2477 | if (err == -EMSGSIZE) | |
2478 | goto nla_put_failure; | |
2479 | } | |
2480 | } | |
2481 | } else | |
2482 | #endif | |
c78679e8 DM |
2483 | if (nla_put_u32(skb, RTA_IIF, iif)) |
2484 | goto nla_put_failure; | |
7bc570c8 | 2485 | } else if (dst) { |
1da177e4 | 2486 | struct in6_addr saddr_buf; |
c78679e8 DM |
2487 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
2488 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) | |
2489 | goto nla_put_failure; | |
1da177e4 | 2490 | } |
2d7202bf | 2491 | |
c3968a85 DW |
2492 | if (rt->rt6i_prefsrc.plen) { |
2493 | struct in6_addr saddr_buf; | |
4e3fd7a0 | 2494 | saddr_buf = rt->rt6i_prefsrc.addr; |
c78679e8 DM |
2495 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
2496 | goto nla_put_failure; | |
c3968a85 DW |
2497 | } |
2498 | ||
defb3519 | 2499 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2500 | goto nla_put_failure; |
2501 | ||
f2c31e32 | 2502 | rcu_read_lock(); |
27217455 | 2503 | n = dst_get_neighbour_noref(&rt->dst); |
94f826b8 ED |
2504 | if (n) { |
2505 | if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) { | |
2506 | rcu_read_unlock(); | |
2507 | goto nla_put_failure; | |
2508 | } | |
2509 | } | |
f2c31e32 | 2510 | rcu_read_unlock(); |
2d7202bf | 2511 | |
c78679e8 DM |
2512 | if (rt->dst.dev && |
2513 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2514 | goto nla_put_failure; | |
2515 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) | |
2516 | goto nla_put_failure; | |
36e3deae YH |
2517 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2518 | expires = 0; | |
d1918542 DM |
2519 | else if (rt->dst.expires - jiffies < INT_MAX) |
2520 | expires = rt->dst.expires - jiffies; | |
36e3deae YH |
2521 | else |
2522 | expires = INT_MAX; | |
69cdf8f9 | 2523 | |
346f870b DM |
2524 | peer = rt->rt6i_peer; |
2525 | ts = tsage = 0; | |
2526 | if (peer && peer->tcp_ts_stamp) { | |
2527 | ts = peer->tcp_ts; | |
2528 | tsage = get_seconds() - peer->tcp_ts_stamp; | |
2529 | } | |
2530 | ||
2531 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, ts, tsage, | |
d8d1f30b | 2532 | expires, rt->dst.error) < 0) |
e3703b3d | 2533 | goto nla_put_failure; |
2d7202bf TG |
2534 | |
2535 | return nlmsg_end(skb, nlh); | |
2536 | ||
2537 | nla_put_failure: | |
26932566 PM |
2538 | nlmsg_cancel(skb, nlh); |
2539 | return -EMSGSIZE; | |
1da177e4 LT |
2540 | } |
2541 | ||
1b43af54 | 2542 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2543 | { |
2544 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2545 | int prefix; | |
2546 | ||
2d7202bf TG |
2547 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2548 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2549 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2550 | } else | |
2551 | prefix = 0; | |
2552 | ||
191cd582 BH |
2553 | return rt6_fill_node(arg->net, |
2554 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2555 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2556 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2557 | } |
2558 | ||
c127ea2c | 2559 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2560 | { |
3b1e0a65 | 2561 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2562 | struct nlattr *tb[RTA_MAX+1]; |
2563 | struct rt6_info *rt; | |
1da177e4 | 2564 | struct sk_buff *skb; |
ab364a6f | 2565 | struct rtmsg *rtm; |
4c9483b2 | 2566 | struct flowi6 fl6; |
72331bc0 | 2567 | int err, iif = 0, oif = 0; |
1da177e4 | 2568 | |
ab364a6f TG |
2569 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2570 | if (err < 0) | |
2571 | goto errout; | |
1da177e4 | 2572 | |
ab364a6f | 2573 | err = -EINVAL; |
4c9483b2 | 2574 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 2575 | |
ab364a6f TG |
2576 | if (tb[RTA_SRC]) { |
2577 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2578 | goto errout; | |
2579 | ||
4e3fd7a0 | 2580 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
ab364a6f TG |
2581 | } |
2582 | ||
2583 | if (tb[RTA_DST]) { | |
2584 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2585 | goto errout; | |
2586 | ||
4e3fd7a0 | 2587 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
ab364a6f TG |
2588 | } |
2589 | ||
2590 | if (tb[RTA_IIF]) | |
2591 | iif = nla_get_u32(tb[RTA_IIF]); | |
2592 | ||
2593 | if (tb[RTA_OIF]) | |
72331bc0 | 2594 | oif = nla_get_u32(tb[RTA_OIF]); |
1da177e4 LT |
2595 | |
2596 | if (iif) { | |
2597 | struct net_device *dev; | |
72331bc0 SL |
2598 | int flags = 0; |
2599 | ||
5578689a | 2600 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2601 | if (!dev) { |
2602 | err = -ENODEV; | |
ab364a6f | 2603 | goto errout; |
1da177e4 | 2604 | } |
72331bc0 SL |
2605 | |
2606 | fl6.flowi6_iif = iif; | |
2607 | ||
2608 | if (!ipv6_addr_any(&fl6.saddr)) | |
2609 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
2610 | ||
2611 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, | |
2612 | flags); | |
2613 | } else { | |
2614 | fl6.flowi6_oif = oif; | |
2615 | ||
2616 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); | |
1da177e4 LT |
2617 | } |
2618 | ||
ab364a6f | 2619 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
38308473 | 2620 | if (!skb) { |
2173bff5 | 2621 | dst_release(&rt->dst); |
ab364a6f TG |
2622 | err = -ENOBUFS; |
2623 | goto errout; | |
2624 | } | |
1da177e4 | 2625 | |
ab364a6f TG |
2626 | /* Reserve room for dummy headers, this skb can pass |
2627 | through good chunk of routing engine. | |
2628 | */ | |
459a98ed | 2629 | skb_reset_mac_header(skb); |
ab364a6f | 2630 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2631 | |
d8d1f30b | 2632 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2633 | |
4c9483b2 | 2634 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
1da177e4 | 2635 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2636 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2637 | if (err < 0) { |
ab364a6f TG |
2638 | kfree_skb(skb); |
2639 | goto errout; | |
1da177e4 LT |
2640 | } |
2641 | ||
5578689a | 2642 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2643 | errout: |
1da177e4 | 2644 | return err; |
1da177e4 LT |
2645 | } |
2646 | ||
86872cb5 | 2647 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2648 | { |
2649 | struct sk_buff *skb; | |
5578689a | 2650 | struct net *net = info->nl_net; |
528c4ceb DL |
2651 | u32 seq; |
2652 | int err; | |
2653 | ||
2654 | err = -ENOBUFS; | |
38308473 | 2655 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
86872cb5 | 2656 | |
339bf98f | 2657 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
38308473 | 2658 | if (!skb) |
21713ebc TG |
2659 | goto errout; |
2660 | ||
191cd582 | 2661 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2662 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2663 | if (err < 0) { |
2664 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2665 | WARN_ON(err == -EMSGSIZE); | |
2666 | kfree_skb(skb); | |
2667 | goto errout; | |
2668 | } | |
1ce85fe4 PNA |
2669 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2670 | info->nlh, gfp_any()); | |
2671 | return; | |
21713ebc TG |
2672 | errout: |
2673 | if (err < 0) | |
5578689a | 2674 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2675 | } |
2676 | ||
8ed67789 DL |
2677 | static int ip6_route_dev_notify(struct notifier_block *this, |
2678 | unsigned long event, void *data) | |
2679 | { | |
2680 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2681 | struct net *net = dev_net(dev); |
8ed67789 DL |
2682 | |
2683 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2684 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2685 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2686 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2687 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2688 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2689 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2690 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2691 | #endif | |
2692 | } | |
2693 | ||
2694 | return NOTIFY_OK; | |
2695 | } | |
2696 | ||
1da177e4 LT |
2697 | /* |
2698 | * /proc | |
2699 | */ | |
2700 | ||
2701 | #ifdef CONFIG_PROC_FS | |
2702 | ||
1da177e4 LT |
2703 | struct rt6_proc_arg |
2704 | { | |
2705 | char *buffer; | |
2706 | int offset; | |
2707 | int length; | |
2708 | int skip; | |
2709 | int len; | |
2710 | }; | |
2711 | ||
2712 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2713 | { | |
33120b30 | 2714 | struct seq_file *m = p_arg; |
69cce1d1 | 2715 | struct neighbour *n; |
1da177e4 | 2716 | |
4b7a4274 | 2717 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2718 | |
2719 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2720 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2721 | #else |
33120b30 | 2722 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 | 2723 | #endif |
f2c31e32 | 2724 | rcu_read_lock(); |
27217455 | 2725 | n = dst_get_neighbour_noref(&rt->dst); |
69cce1d1 DM |
2726 | if (n) { |
2727 | seq_printf(m, "%pi6", n->primary_key); | |
1da177e4 | 2728 | } else { |
33120b30 | 2729 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2730 | } |
f2c31e32 | 2731 | rcu_read_unlock(); |
33120b30 | 2732 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2733 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2734 | rt->dst.__use, rt->rt6i_flags, | |
d1918542 | 2735 | rt->dst.dev ? rt->dst.dev->name : ""); |
1da177e4 LT |
2736 | return 0; |
2737 | } | |
2738 | ||
33120b30 | 2739 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2740 | { |
f3db4851 | 2741 | struct net *net = (struct net *)m->private; |
32b293a5 | 2742 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
33120b30 AD |
2743 | return 0; |
2744 | } | |
1da177e4 | 2745 | |
33120b30 AD |
2746 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2747 | { | |
de05c557 | 2748 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2749 | } |
2750 | ||
33120b30 AD |
2751 | static const struct file_operations ipv6_route_proc_fops = { |
2752 | .owner = THIS_MODULE, | |
2753 | .open = ipv6_route_open, | |
2754 | .read = seq_read, | |
2755 | .llseek = seq_lseek, | |
b6fcbdb4 | 2756 | .release = single_release_net, |
33120b30 AD |
2757 | }; |
2758 | ||
1da177e4 LT |
2759 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2760 | { | |
69ddb805 | 2761 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2762 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2763 | net->ipv6.rt6_stats->fib_nodes, |
2764 | net->ipv6.rt6_stats->fib_route_nodes, | |
2765 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2766 | net->ipv6.rt6_stats->fib_rt_entries, | |
2767 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2768 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2769 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2770 | |
2771 | return 0; | |
2772 | } | |
2773 | ||
2774 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2775 | { | |
de05c557 | 2776 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2777 | } |
2778 | ||
9a32144e | 2779 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2780 | .owner = THIS_MODULE, |
2781 | .open = rt6_stats_seq_open, | |
2782 | .read = seq_read, | |
2783 | .llseek = seq_lseek, | |
b6fcbdb4 | 2784 | .release = single_release_net, |
1da177e4 LT |
2785 | }; |
2786 | #endif /* CONFIG_PROC_FS */ | |
2787 | ||
2788 | #ifdef CONFIG_SYSCTL | |
2789 | ||
1da177e4 | 2790 | static |
8d65af78 | 2791 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2792 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2793 | { | |
c486da34 LAG |
2794 | struct net *net; |
2795 | int delay; | |
2796 | if (!write) | |
1da177e4 | 2797 | return -EINVAL; |
c486da34 LAG |
2798 | |
2799 | net = (struct net *)ctl->extra1; | |
2800 | delay = net->ipv6.sysctl.flush_delay; | |
2801 | proc_dointvec(ctl, write, buffer, lenp, ppos); | |
2802 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); | |
2803 | return 0; | |
1da177e4 LT |
2804 | } |
2805 | ||
760f2d01 | 2806 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2807 | { |
1da177e4 | 2808 | .procname = "flush", |
4990509f | 2809 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2810 | .maxlen = sizeof(int), |
89c8b3a1 | 2811 | .mode = 0200, |
6d9f239a | 2812 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2813 | }, |
2814 | { | |
1da177e4 | 2815 | .procname = "gc_thresh", |
9a7ec3a9 | 2816 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2817 | .maxlen = sizeof(int), |
2818 | .mode = 0644, | |
6d9f239a | 2819 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2820 | }, |
2821 | { | |
1da177e4 | 2822 | .procname = "max_size", |
4990509f | 2823 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2824 | .maxlen = sizeof(int), |
2825 | .mode = 0644, | |
6d9f239a | 2826 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2827 | }, |
2828 | { | |
1da177e4 | 2829 | .procname = "gc_min_interval", |
4990509f | 2830 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2831 | .maxlen = sizeof(int), |
2832 | .mode = 0644, | |
6d9f239a | 2833 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2834 | }, |
2835 | { | |
1da177e4 | 2836 | .procname = "gc_timeout", |
4990509f | 2837 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2838 | .maxlen = sizeof(int), |
2839 | .mode = 0644, | |
6d9f239a | 2840 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2841 | }, |
2842 | { | |
1da177e4 | 2843 | .procname = "gc_interval", |
4990509f | 2844 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2845 | .maxlen = sizeof(int), |
2846 | .mode = 0644, | |
6d9f239a | 2847 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2848 | }, |
2849 | { | |
1da177e4 | 2850 | .procname = "gc_elasticity", |
4990509f | 2851 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2852 | .maxlen = sizeof(int), |
2853 | .mode = 0644, | |
f3d3f616 | 2854 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2855 | }, |
2856 | { | |
1da177e4 | 2857 | .procname = "mtu_expires", |
4990509f | 2858 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2859 | .maxlen = sizeof(int), |
2860 | .mode = 0644, | |
6d9f239a | 2861 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2862 | }, |
2863 | { | |
1da177e4 | 2864 | .procname = "min_adv_mss", |
4990509f | 2865 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2866 | .maxlen = sizeof(int), |
2867 | .mode = 0644, | |
f3d3f616 | 2868 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2869 | }, |
2870 | { | |
1da177e4 | 2871 | .procname = "gc_min_interval_ms", |
4990509f | 2872 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2873 | .maxlen = sizeof(int), |
2874 | .mode = 0644, | |
6d9f239a | 2875 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2876 | }, |
f8572d8f | 2877 | { } |
1da177e4 LT |
2878 | }; |
2879 | ||
2c8c1e72 | 2880 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2881 | { |
2882 | struct ctl_table *table; | |
2883 | ||
2884 | table = kmemdup(ipv6_route_table_template, | |
2885 | sizeof(ipv6_route_table_template), | |
2886 | GFP_KERNEL); | |
5ee09105 YH |
2887 | |
2888 | if (table) { | |
2889 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
c486da34 | 2890 | table[0].extra1 = net; |
86393e52 | 2891 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2892 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2893 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2894 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2895 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2896 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2897 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2898 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2899 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2900 | } |
2901 | ||
760f2d01 DL |
2902 | return table; |
2903 | } | |
1da177e4 LT |
2904 | #endif |
2905 | ||
2c8c1e72 | 2906 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2907 | { |
633d424b | 2908 | int ret = -ENOMEM; |
8ed67789 | 2909 | |
86393e52 AD |
2910 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2911 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2912 | |
fc66f95c ED |
2913 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2914 | goto out_ip6_dst_ops; | |
2915 | ||
8ed67789 DL |
2916 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2917 | sizeof(*net->ipv6.ip6_null_entry), | |
2918 | GFP_KERNEL); | |
2919 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2920 | goto out_ip6_dst_entries; |
d8d1f30b | 2921 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2922 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2923 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2924 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2925 | ip6_template_metrics, true); | |
8ed67789 DL |
2926 | |
2927 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2928 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2929 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2930 | GFP_KERNEL); | |
68fffc67 PZ |
2931 | if (!net->ipv6.ip6_prohibit_entry) |
2932 | goto out_ip6_null_entry; | |
d8d1f30b | 2933 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2934 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2935 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2936 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2937 | ip6_template_metrics, true); | |
8ed67789 DL |
2938 | |
2939 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2940 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2941 | GFP_KERNEL); | |
68fffc67 PZ |
2942 | if (!net->ipv6.ip6_blk_hole_entry) |
2943 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2944 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2945 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2946 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2947 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2948 | ip6_template_metrics, true); | |
8ed67789 DL |
2949 | #endif |
2950 | ||
b339a47c PZ |
2951 | net->ipv6.sysctl.flush_delay = 0; |
2952 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2953 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2954 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2955 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2956 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2957 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2958 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2959 | ||
6891a346 BT |
2960 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2961 | ||
8ed67789 DL |
2962 | ret = 0; |
2963 | out: | |
2964 | return ret; | |
f2fc6a54 | 2965 | |
68fffc67 PZ |
2966 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2967 | out_ip6_prohibit_entry: | |
2968 | kfree(net->ipv6.ip6_prohibit_entry); | |
2969 | out_ip6_null_entry: | |
2970 | kfree(net->ipv6.ip6_null_entry); | |
2971 | #endif | |
fc66f95c ED |
2972 | out_ip6_dst_entries: |
2973 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2974 | out_ip6_dst_ops: |
f2fc6a54 | 2975 | goto out; |
cdb18761 DL |
2976 | } |
2977 | ||
2c8c1e72 | 2978 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 | 2979 | { |
8ed67789 DL |
2980 | kfree(net->ipv6.ip6_null_entry); |
2981 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2982 | kfree(net->ipv6.ip6_prohibit_entry); | |
2983 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2984 | #endif | |
41bb78b4 | 2985 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2986 | } |
2987 | ||
d189634e TG |
2988 | static int __net_init ip6_route_net_init_late(struct net *net) |
2989 | { | |
2990 | #ifdef CONFIG_PROC_FS | |
2991 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2992 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2993 | #endif | |
2994 | return 0; | |
2995 | } | |
2996 | ||
2997 | static void __net_exit ip6_route_net_exit_late(struct net *net) | |
2998 | { | |
2999 | #ifdef CONFIG_PROC_FS | |
3000 | proc_net_remove(net, "ipv6_route"); | |
3001 | proc_net_remove(net, "rt6_stats"); | |
3002 | #endif | |
3003 | } | |
3004 | ||
cdb18761 DL |
3005 | static struct pernet_operations ip6_route_net_ops = { |
3006 | .init = ip6_route_net_init, | |
3007 | .exit = ip6_route_net_exit, | |
3008 | }; | |
3009 | ||
d189634e TG |
3010 | static struct pernet_operations ip6_route_net_late_ops = { |
3011 | .init = ip6_route_net_init_late, | |
3012 | .exit = ip6_route_net_exit_late, | |
3013 | }; | |
3014 | ||
8ed67789 DL |
3015 | static struct notifier_block ip6_route_dev_notifier = { |
3016 | .notifier_call = ip6_route_dev_notify, | |
3017 | .priority = 0, | |
3018 | }; | |
3019 | ||
433d49c3 | 3020 | int __init ip6_route_init(void) |
1da177e4 | 3021 | { |
433d49c3 DL |
3022 | int ret; |
3023 | ||
9a7ec3a9 DL |
3024 | ret = -ENOMEM; |
3025 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 3026 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 3027 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 3028 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 3029 | goto out; |
14e50e57 | 3030 | |
fc66f95c | 3031 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 3032 | if (ret) |
bdb3289f | 3033 | goto out_kmem_cache; |
bdb3289f | 3034 | |
2a0c451a TG |
3035 | ret = register_pernet_subsys(&ip6_route_net_ops); |
3036 | if (ret) | |
e8803b6c | 3037 | goto out_dst_entries; |
2a0c451a | 3038 | |
5dc121e9 AE |
3039 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
3040 | ||
8ed67789 DL |
3041 | /* Registering of the loopback is done before this portion of code, |
3042 | * the loopback reference in rt6_info will not be taken, do it | |
3043 | * manually for init_net */ | |
d8d1f30b | 3044 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3045 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3046 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 3047 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 3048 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 3049 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
3050 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
3051 | #endif | |
e8803b6c | 3052 | ret = fib6_init(); |
433d49c3 | 3053 | if (ret) |
8ed67789 | 3054 | goto out_register_subsys; |
433d49c3 | 3055 | |
433d49c3 DL |
3056 | ret = xfrm6_init(); |
3057 | if (ret) | |
e8803b6c | 3058 | goto out_fib6_init; |
c35b7e72 | 3059 | |
433d49c3 DL |
3060 | ret = fib6_rules_init(); |
3061 | if (ret) | |
3062 | goto xfrm6_init; | |
7e5449c2 | 3063 | |
d189634e TG |
3064 | ret = register_pernet_subsys(&ip6_route_net_late_ops); |
3065 | if (ret) | |
3066 | goto fib6_rules_init; | |
3067 | ||
433d49c3 | 3068 | ret = -ENOBUFS; |
c7ac8679 GR |
3069 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
3070 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || | |
3071 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) | |
d189634e | 3072 | goto out_register_late_subsys; |
c127ea2c | 3073 | |
8ed67789 | 3074 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 | 3075 | if (ret) |
d189634e | 3076 | goto out_register_late_subsys; |
8ed67789 | 3077 | |
433d49c3 DL |
3078 | out: |
3079 | return ret; | |
3080 | ||
d189634e TG |
3081 | out_register_late_subsys: |
3082 | unregister_pernet_subsys(&ip6_route_net_late_ops); | |
433d49c3 | 3083 | fib6_rules_init: |
433d49c3 DL |
3084 | fib6_rules_cleanup(); |
3085 | xfrm6_init: | |
433d49c3 | 3086 | xfrm6_fini(); |
2a0c451a TG |
3087 | out_fib6_init: |
3088 | fib6_gc_cleanup(); | |
e8803b6c DM |
3089 | out_register_subsys: |
3090 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
3091 | out_dst_entries: |
3092 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 3093 | out_kmem_cache: |
f2fc6a54 | 3094 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 3095 | goto out; |
1da177e4 LT |
3096 | } |
3097 | ||
3098 | void ip6_route_cleanup(void) | |
3099 | { | |
8ed67789 | 3100 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
d189634e | 3101 | unregister_pernet_subsys(&ip6_route_net_late_ops); |
101367c2 | 3102 | fib6_rules_cleanup(); |
1da177e4 | 3103 | xfrm6_fini(); |
1da177e4 | 3104 | fib6_gc_cleanup(); |
8ed67789 | 3105 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 3106 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 3107 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 3108 | } |