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 | ||
4fc268d2 | 27 | #include <linux/capability.h> |
1da177e4 LT |
28 | #include <linux/errno.h> |
29 | #include <linux/types.h> | |
30 | #include <linux/times.h> | |
31 | #include <linux/socket.h> | |
32 | #include <linux/sockios.h> | |
33 | #include <linux/net.h> | |
34 | #include <linux/route.h> | |
35 | #include <linux/netdevice.h> | |
36 | #include <linux/in6.h> | |
7bc570c8 | 37 | #include <linux/mroute6.h> |
1da177e4 | 38 | #include <linux/init.h> |
1da177e4 | 39 | #include <linux/if_arp.h> |
1da177e4 LT |
40 | #include <linux/proc_fs.h> |
41 | #include <linux/seq_file.h> | |
5b7c931d | 42 | #include <linux/nsproxy.h> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
457c4cbc | 44 | #include <net/net_namespace.h> |
1da177e4 LT |
45 | #include <net/snmp.h> |
46 | #include <net/ipv6.h> | |
47 | #include <net/ip6_fib.h> | |
48 | #include <net/ip6_route.h> | |
49 | #include <net/ndisc.h> | |
50 | #include <net/addrconf.h> | |
51 | #include <net/tcp.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/dst.h> | |
54 | #include <net/xfrm.h> | |
8d71740c | 55 | #include <net/netevent.h> |
21713ebc | 56 | #include <net/netlink.h> |
1da177e4 LT |
57 | |
58 | #include <asm/uaccess.h> | |
59 | ||
60 | #ifdef CONFIG_SYSCTL | |
61 | #include <linux/sysctl.h> | |
62 | #endif | |
63 | ||
64 | /* Set to 3 to get tracing. */ | |
65 | #define RT6_DEBUG 2 | |
66 | ||
67 | #if RT6_DEBUG >= 3 | |
68 | #define RDBG(x) printk x | |
69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) | |
70 | #else | |
71 | #define RDBG(x) | |
72 | #define RT6_TRACE(x...) do { ; } while (0) | |
73 | #endif | |
74 | ||
1da177e4 LT |
75 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
76 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 77 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
d33e4553 | 78 | static unsigned int ip6_default_mtu(const struct dst_entry *dst); |
1da177e4 LT |
79 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
80 | static void ip6_dst_destroy(struct dst_entry *); | |
81 | static void ip6_dst_ifdown(struct dst_entry *, | |
82 | struct net_device *dev, int how); | |
569d3645 | 83 | static int ip6_dst_gc(struct dst_ops *ops); |
1da177e4 LT |
84 | |
85 | static int ip6_pkt_discard(struct sk_buff *skb); | |
86 | static int ip6_pkt_discard_out(struct sk_buff *skb); | |
87 | static void ip6_link_failure(struct sk_buff *skb); | |
88 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); | |
89 | ||
70ceb4f5 | 90 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
91 | static struct rt6_info *rt6_add_route_info(struct net *net, |
92 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
93 | struct in6_addr *gwaddr, int ifindex, |
94 | unsigned pref); | |
efa2cea0 DL |
95 | static struct rt6_info *rt6_get_route_info(struct net *net, |
96 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
97 | struct in6_addr *gwaddr, int ifindex); |
98 | #endif | |
99 | ||
06582540 DM |
100 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
101 | { | |
102 | struct rt6_info *rt = (struct rt6_info *) dst; | |
103 | struct inet_peer *peer; | |
104 | u32 *p = NULL; | |
105 | ||
106 | if (!rt->rt6i_peer) | |
107 | rt6_bind_peer(rt, 1); | |
108 | ||
109 | peer = rt->rt6i_peer; | |
110 | if (peer) { | |
111 | u32 *old_p = __DST_METRICS_PTR(old); | |
112 | unsigned long prev, new; | |
113 | ||
114 | p = peer->metrics; | |
115 | if (inet_metrics_new(peer)) | |
116 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); | |
117 | ||
118 | new = (unsigned long) p; | |
119 | prev = cmpxchg(&dst->_metrics, old, new); | |
120 | ||
121 | if (prev != old) { | |
122 | p = __DST_METRICS_PTR(prev); | |
123 | if (prev & DST_METRICS_READ_ONLY) | |
124 | p = NULL; | |
125 | } | |
126 | } | |
127 | return p; | |
128 | } | |
129 | ||
9a7ec3a9 | 130 | static struct dst_ops ip6_dst_ops_template = { |
1da177e4 | 131 | .family = AF_INET6, |
09640e63 | 132 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 LT |
133 | .gc = ip6_dst_gc, |
134 | .gc_thresh = 1024, | |
135 | .check = ip6_dst_check, | |
0dbaee3b | 136 | .default_advmss = ip6_default_advmss, |
d33e4553 | 137 | .default_mtu = ip6_default_mtu, |
06582540 | 138 | .cow_metrics = ipv6_cow_metrics, |
1da177e4 LT |
139 | .destroy = ip6_dst_destroy, |
140 | .ifdown = ip6_dst_ifdown, | |
141 | .negative_advice = ip6_negative_advice, | |
142 | .link_failure = ip6_link_failure, | |
143 | .update_pmtu = ip6_rt_update_pmtu, | |
1ac06e03 | 144 | .local_out = __ip6_local_out, |
1da177e4 LT |
145 | }; |
146 | ||
ec831ea7 RD |
147 | static unsigned int ip6_blackhole_default_mtu(const struct dst_entry *dst) |
148 | { | |
149 | return 0; | |
150 | } | |
151 | ||
14e50e57 DM |
152 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
153 | { | |
154 | } | |
155 | ||
156 | static struct dst_ops ip6_dst_blackhole_ops = { | |
157 | .family = AF_INET6, | |
09640e63 | 158 | .protocol = cpu_to_be16(ETH_P_IPV6), |
14e50e57 DM |
159 | .destroy = ip6_dst_destroy, |
160 | .check = ip6_dst_check, | |
ec831ea7 | 161 | .default_mtu = ip6_blackhole_default_mtu, |
214f45c9 | 162 | .default_advmss = ip6_default_advmss, |
14e50e57 | 163 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
14e50e57 DM |
164 | }; |
165 | ||
62fa8a84 DM |
166 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
167 | [RTAX_HOPLIMIT - 1] = 255, | |
168 | }; | |
169 | ||
bdb3289f | 170 | static struct rt6_info ip6_null_entry_template = { |
d8d1f30b CG |
171 | .dst = { |
172 | .__refcnt = ATOMIC_INIT(1), | |
173 | .__use = 1, | |
174 | .obsolete = -1, | |
175 | .error = -ENETUNREACH, | |
d8d1f30b CG |
176 | .input = ip6_pkt_discard, |
177 | .output = ip6_pkt_discard_out, | |
1da177e4 LT |
178 | }, |
179 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 180 | .rt6i_protocol = RTPROT_KERNEL, |
1da177e4 LT |
181 | .rt6i_metric = ~(u32) 0, |
182 | .rt6i_ref = ATOMIC_INIT(1), | |
183 | }; | |
184 | ||
101367c2 TG |
185 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
186 | ||
6723ab54 DM |
187 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
188 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); | |
6723ab54 | 189 | |
280a34c8 | 190 | static struct rt6_info ip6_prohibit_entry_template = { |
d8d1f30b CG |
191 | .dst = { |
192 | .__refcnt = ATOMIC_INIT(1), | |
193 | .__use = 1, | |
194 | .obsolete = -1, | |
195 | .error = -EACCES, | |
d8d1f30b CG |
196 | .input = ip6_pkt_prohibit, |
197 | .output = ip6_pkt_prohibit_out, | |
101367c2 TG |
198 | }, |
199 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 200 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
201 | .rt6i_metric = ~(u32) 0, |
202 | .rt6i_ref = ATOMIC_INIT(1), | |
203 | }; | |
204 | ||
bdb3289f | 205 | static struct rt6_info ip6_blk_hole_entry_template = { |
d8d1f30b CG |
206 | .dst = { |
207 | .__refcnt = ATOMIC_INIT(1), | |
208 | .__use = 1, | |
209 | .obsolete = -1, | |
210 | .error = -EINVAL, | |
d8d1f30b CG |
211 | .input = dst_discard, |
212 | .output = dst_discard, | |
101367c2 TG |
213 | }, |
214 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), | |
4f724279 | 215 | .rt6i_protocol = RTPROT_KERNEL, |
101367c2 TG |
216 | .rt6i_metric = ~(u32) 0, |
217 | .rt6i_ref = ATOMIC_INIT(1), | |
218 | }; | |
219 | ||
220 | #endif | |
221 | ||
1da177e4 | 222 | /* allocate dst with ip6_dst_ops */ |
f2fc6a54 | 223 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops) |
1da177e4 | 224 | { |
3c7bd1a1 | 225 | return (struct rt6_info *)dst_alloc(ops, 0); |
1da177e4 LT |
226 | } |
227 | ||
228 | static void ip6_dst_destroy(struct dst_entry *dst) | |
229 | { | |
230 | struct rt6_info *rt = (struct rt6_info *)dst; | |
231 | struct inet6_dev *idev = rt->rt6i_idev; | |
b3419363 | 232 | struct inet_peer *peer = rt->rt6i_peer; |
1da177e4 LT |
233 | |
234 | if (idev != NULL) { | |
235 | rt->rt6i_idev = NULL; | |
236 | in6_dev_put(idev); | |
1ab1457c | 237 | } |
b3419363 | 238 | if (peer) { |
b3419363 DM |
239 | rt->rt6i_peer = NULL; |
240 | inet_putpeer(peer); | |
241 | } | |
242 | } | |
243 | ||
6431cbc2 DM |
244 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
245 | ||
246 | static u32 rt6_peer_genid(void) | |
247 | { | |
248 | return atomic_read(&__rt6_peer_genid); | |
249 | } | |
250 | ||
b3419363 DM |
251 | void rt6_bind_peer(struct rt6_info *rt, int create) |
252 | { | |
253 | struct inet_peer *peer; | |
254 | ||
b3419363 DM |
255 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
256 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) | |
257 | inet_putpeer(peer); | |
6431cbc2 DM |
258 | else |
259 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
1da177e4 LT |
260 | } |
261 | ||
262 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, | |
263 | int how) | |
264 | { | |
265 | struct rt6_info *rt = (struct rt6_info *)dst; | |
266 | struct inet6_dev *idev = rt->rt6i_idev; | |
5a3e55d6 | 267 | struct net_device *loopback_dev = |
c346dca1 | 268 | dev_net(dev)->loopback_dev; |
1da177e4 | 269 | |
5a3e55d6 DL |
270 | if (dev != loopback_dev && idev != NULL && idev->dev == dev) { |
271 | struct inet6_dev *loopback_idev = | |
272 | in6_dev_get(loopback_dev); | |
1da177e4 LT |
273 | if (loopback_idev != NULL) { |
274 | rt->rt6i_idev = loopback_idev; | |
275 | in6_dev_put(idev); | |
276 | } | |
277 | } | |
278 | } | |
279 | ||
280 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) | |
281 | { | |
a02cec21 ED |
282 | return (rt->rt6i_flags & RTF_EXPIRES) && |
283 | time_after(jiffies, rt->rt6i_expires); | |
1da177e4 LT |
284 | } |
285 | ||
c71099ac TG |
286 | static inline int rt6_need_strict(struct in6_addr *daddr) |
287 | { | |
a02cec21 ED |
288 | return ipv6_addr_type(daddr) & |
289 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
c71099ac TG |
290 | } |
291 | ||
1da177e4 | 292 | /* |
c71099ac | 293 | * Route lookup. Any table->tb6_lock is implied. |
1da177e4 LT |
294 | */ |
295 | ||
8ed67789 DL |
296 | static inline struct rt6_info *rt6_device_match(struct net *net, |
297 | struct rt6_info *rt, | |
dd3abc4e | 298 | struct in6_addr *saddr, |
1da177e4 | 299 | int oif, |
d420895e | 300 | int flags) |
1da177e4 LT |
301 | { |
302 | struct rt6_info *local = NULL; | |
303 | struct rt6_info *sprt; | |
304 | ||
dd3abc4e YH |
305 | if (!oif && ipv6_addr_any(saddr)) |
306 | goto out; | |
307 | ||
d8d1f30b | 308 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
dd3abc4e YH |
309 | struct net_device *dev = sprt->rt6i_dev; |
310 | ||
311 | if (oif) { | |
1da177e4 LT |
312 | if (dev->ifindex == oif) |
313 | return sprt; | |
314 | if (dev->flags & IFF_LOOPBACK) { | |
315 | if (sprt->rt6i_idev == NULL || | |
316 | sprt->rt6i_idev->dev->ifindex != oif) { | |
d420895e | 317 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
1da177e4 | 318 | continue; |
1ab1457c | 319 | if (local && (!oif || |
1da177e4 LT |
320 | local->rt6i_idev->dev->ifindex == oif)) |
321 | continue; | |
322 | } | |
323 | local = sprt; | |
324 | } | |
dd3abc4e YH |
325 | } else { |
326 | if (ipv6_chk_addr(net, saddr, dev, | |
327 | flags & RT6_LOOKUP_F_IFACE)) | |
328 | return sprt; | |
1da177e4 | 329 | } |
dd3abc4e | 330 | } |
1da177e4 | 331 | |
dd3abc4e | 332 | if (oif) { |
1da177e4 LT |
333 | if (local) |
334 | return local; | |
335 | ||
d420895e | 336 | if (flags & RT6_LOOKUP_F_IFACE) |
8ed67789 | 337 | return net->ipv6.ip6_null_entry; |
1da177e4 | 338 | } |
dd3abc4e | 339 | out: |
1da177e4 LT |
340 | return rt; |
341 | } | |
342 | ||
27097255 YH |
343 | #ifdef CONFIG_IPV6_ROUTER_PREF |
344 | static void rt6_probe(struct rt6_info *rt) | |
345 | { | |
346 | struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL; | |
347 | /* | |
348 | * Okay, this does not seem to be appropriate | |
349 | * for now, however, we need to check if it | |
350 | * is really so; aka Router Reachability Probing. | |
351 | * | |
352 | * Router Reachability Probe MUST be rate-limited | |
353 | * to no more than one per minute. | |
354 | */ | |
355 | if (!neigh || (neigh->nud_state & NUD_VALID)) | |
356 | return; | |
357 | read_lock_bh(&neigh->lock); | |
358 | if (!(neigh->nud_state & NUD_VALID) && | |
52e16356 | 359 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
27097255 YH |
360 | struct in6_addr mcaddr; |
361 | struct in6_addr *target; | |
362 | ||
363 | neigh->updated = jiffies; | |
364 | read_unlock_bh(&neigh->lock); | |
365 | ||
366 | target = (struct in6_addr *)&neigh->primary_key; | |
367 | addrconf_addr_solict_mult(target, &mcaddr); | |
368 | ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL); | |
369 | } else | |
370 | read_unlock_bh(&neigh->lock); | |
371 | } | |
372 | #else | |
373 | static inline void rt6_probe(struct rt6_info *rt) | |
374 | { | |
27097255 YH |
375 | } |
376 | #endif | |
377 | ||
1da177e4 | 378 | /* |
554cfb7e | 379 | * Default Router Selection (RFC 2461 6.3.6) |
1da177e4 | 380 | */ |
b6f99a21 | 381 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
554cfb7e YH |
382 | { |
383 | struct net_device *dev = rt->rt6i_dev; | |
161980f4 | 384 | if (!oif || dev->ifindex == oif) |
554cfb7e | 385 | return 2; |
161980f4 DM |
386 | if ((dev->flags & IFF_LOOPBACK) && |
387 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) | |
388 | return 1; | |
389 | return 0; | |
554cfb7e | 390 | } |
1da177e4 | 391 | |
b6f99a21 | 392 | static inline int rt6_check_neigh(struct rt6_info *rt) |
1da177e4 | 393 | { |
554cfb7e | 394 | struct neighbour *neigh = rt->rt6i_nexthop; |
398bcbeb | 395 | int m; |
4d0c5911 YH |
396 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
397 | !(rt->rt6i_flags & RTF_GATEWAY)) | |
398 | m = 1; | |
399 | else if (neigh) { | |
554cfb7e YH |
400 | read_lock_bh(&neigh->lock); |
401 | if (neigh->nud_state & NUD_VALID) | |
4d0c5911 | 402 | m = 2; |
398bcbeb YH |
403 | #ifdef CONFIG_IPV6_ROUTER_PREF |
404 | else if (neigh->nud_state & NUD_FAILED) | |
405 | m = 0; | |
406 | #endif | |
407 | else | |
ea73ee23 | 408 | m = 1; |
554cfb7e | 409 | read_unlock_bh(&neigh->lock); |
398bcbeb YH |
410 | } else |
411 | m = 0; | |
554cfb7e | 412 | return m; |
1da177e4 LT |
413 | } |
414 | ||
554cfb7e YH |
415 | static int rt6_score_route(struct rt6_info *rt, int oif, |
416 | int strict) | |
1da177e4 | 417 | { |
4d0c5911 | 418 | int m, n; |
1ab1457c | 419 | |
4d0c5911 | 420 | m = rt6_check_dev(rt, oif); |
77d16f45 | 421 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
554cfb7e | 422 | return -1; |
ebacaaa0 YH |
423 | #ifdef CONFIG_IPV6_ROUTER_PREF |
424 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; | |
425 | #endif | |
4d0c5911 | 426 | n = rt6_check_neigh(rt); |
557e92ef | 427 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
554cfb7e YH |
428 | return -1; |
429 | return m; | |
430 | } | |
431 | ||
f11e6659 DM |
432 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
433 | int *mpri, struct rt6_info *match) | |
554cfb7e | 434 | { |
f11e6659 DM |
435 | int m; |
436 | ||
437 | if (rt6_check_expired(rt)) | |
438 | goto out; | |
439 | ||
440 | m = rt6_score_route(rt, oif, strict); | |
441 | if (m < 0) | |
442 | goto out; | |
443 | ||
444 | if (m > *mpri) { | |
445 | if (strict & RT6_LOOKUP_F_REACHABLE) | |
446 | rt6_probe(match); | |
447 | *mpri = m; | |
448 | match = rt; | |
449 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { | |
450 | rt6_probe(rt); | |
451 | } | |
452 | ||
453 | out: | |
454 | return match; | |
455 | } | |
456 | ||
457 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, | |
458 | struct rt6_info *rr_head, | |
459 | u32 metric, int oif, int strict) | |
460 | { | |
461 | struct rt6_info *rt, *match; | |
554cfb7e | 462 | int mpri = -1; |
1da177e4 | 463 | |
f11e6659 DM |
464 | match = NULL; |
465 | for (rt = rr_head; rt && rt->rt6i_metric == metric; | |
d8d1f30b | 466 | rt = rt->dst.rt6_next) |
f11e6659 DM |
467 | match = find_match(rt, oif, strict, &mpri, match); |
468 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; | |
d8d1f30b | 469 | rt = rt->dst.rt6_next) |
f11e6659 | 470 | match = find_match(rt, oif, strict, &mpri, match); |
1da177e4 | 471 | |
f11e6659 DM |
472 | return match; |
473 | } | |
1da177e4 | 474 | |
f11e6659 DM |
475 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
476 | { | |
477 | struct rt6_info *match, *rt0; | |
8ed67789 | 478 | struct net *net; |
1da177e4 | 479 | |
f11e6659 | 480 | RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n", |
0dc47877 | 481 | __func__, fn->leaf, oif); |
554cfb7e | 482 | |
f11e6659 DM |
483 | rt0 = fn->rr_ptr; |
484 | if (!rt0) | |
485 | fn->rr_ptr = rt0 = fn->leaf; | |
1da177e4 | 486 | |
f11e6659 | 487 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
1da177e4 | 488 | |
554cfb7e | 489 | if (!match && |
f11e6659 | 490 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
d8d1f30b | 491 | struct rt6_info *next = rt0->dst.rt6_next; |
f11e6659 | 492 | |
554cfb7e | 493 | /* no entries matched; do round-robin */ |
f11e6659 DM |
494 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
495 | next = fn->leaf; | |
496 | ||
497 | if (next != rt0) | |
498 | fn->rr_ptr = next; | |
1da177e4 | 499 | } |
1da177e4 | 500 | |
f11e6659 | 501 | RT6_TRACE("%s() => %p\n", |
0dc47877 | 502 | __func__, match); |
1da177e4 | 503 | |
c346dca1 | 504 | net = dev_net(rt0->rt6i_dev); |
a02cec21 | 505 | return match ? match : net->ipv6.ip6_null_entry; |
1da177e4 LT |
506 | } |
507 | ||
70ceb4f5 YH |
508 | #ifdef CONFIG_IPV6_ROUTE_INFO |
509 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
510 | struct in6_addr *gwaddr) | |
511 | { | |
c346dca1 | 512 | struct net *net = dev_net(dev); |
70ceb4f5 YH |
513 | struct route_info *rinfo = (struct route_info *) opt; |
514 | struct in6_addr prefix_buf, *prefix; | |
515 | unsigned int pref; | |
4bed72e4 | 516 | unsigned long lifetime; |
70ceb4f5 YH |
517 | struct rt6_info *rt; |
518 | ||
519 | if (len < sizeof(struct route_info)) { | |
520 | return -EINVAL; | |
521 | } | |
522 | ||
523 | /* Sanity check for prefix_len and length */ | |
524 | if (rinfo->length > 3) { | |
525 | return -EINVAL; | |
526 | } else if (rinfo->prefix_len > 128) { | |
527 | return -EINVAL; | |
528 | } else if (rinfo->prefix_len > 64) { | |
529 | if (rinfo->length < 2) { | |
530 | return -EINVAL; | |
531 | } | |
532 | } else if (rinfo->prefix_len > 0) { | |
533 | if (rinfo->length < 1) { | |
534 | return -EINVAL; | |
535 | } | |
536 | } | |
537 | ||
538 | pref = rinfo->route_pref; | |
539 | if (pref == ICMPV6_ROUTER_PREF_INVALID) | |
3933fc95 | 540 | return -EINVAL; |
70ceb4f5 | 541 | |
4bed72e4 | 542 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
70ceb4f5 YH |
543 | |
544 | if (rinfo->length == 3) | |
545 | prefix = (struct in6_addr *)rinfo->prefix; | |
546 | else { | |
547 | /* this function is safe */ | |
548 | ipv6_addr_prefix(&prefix_buf, | |
549 | (struct in6_addr *)rinfo->prefix, | |
550 | rinfo->prefix_len); | |
551 | prefix = &prefix_buf; | |
552 | } | |
553 | ||
efa2cea0 DL |
554 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
555 | dev->ifindex); | |
70ceb4f5 YH |
556 | |
557 | if (rt && !lifetime) { | |
e0a1ad73 | 558 | ip6_del_rt(rt); |
70ceb4f5 YH |
559 | rt = NULL; |
560 | } | |
561 | ||
562 | if (!rt && lifetime) | |
efa2cea0 | 563 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
70ceb4f5 YH |
564 | pref); |
565 | else if (rt) | |
566 | rt->rt6i_flags = RTF_ROUTEINFO | | |
567 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
568 | ||
569 | if (rt) { | |
4bed72e4 | 570 | if (!addrconf_finite_timeout(lifetime)) { |
70ceb4f5 YH |
571 | rt->rt6i_flags &= ~RTF_EXPIRES; |
572 | } else { | |
573 | rt->rt6i_expires = jiffies + HZ * lifetime; | |
574 | rt->rt6i_flags |= RTF_EXPIRES; | |
575 | } | |
d8d1f30b | 576 | dst_release(&rt->dst); |
70ceb4f5 YH |
577 | } |
578 | return 0; | |
579 | } | |
580 | #endif | |
581 | ||
8ed67789 | 582 | #define BACKTRACK(__net, saddr) \ |
982f56f3 | 583 | do { \ |
8ed67789 | 584 | if (rt == __net->ipv6.ip6_null_entry) { \ |
982f56f3 | 585 | struct fib6_node *pn; \ |
e0eda7bb | 586 | while (1) { \ |
982f56f3 YH |
587 | if (fn->fn_flags & RTN_TL_ROOT) \ |
588 | goto out; \ | |
589 | pn = fn->parent; \ | |
590 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ | |
8bce65b9 | 591 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
982f56f3 YH |
592 | else \ |
593 | fn = pn; \ | |
594 | if (fn->fn_flags & RTN_RTINFO) \ | |
595 | goto restart; \ | |
c71099ac | 596 | } \ |
c71099ac | 597 | } \ |
982f56f3 | 598 | } while(0) |
c71099ac | 599 | |
8ed67789 DL |
600 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
601 | struct fib6_table *table, | |
c71099ac | 602 | struct flowi *fl, int flags) |
1da177e4 LT |
603 | { |
604 | struct fib6_node *fn; | |
605 | struct rt6_info *rt; | |
606 | ||
c71099ac TG |
607 | read_lock_bh(&table->tb6_lock); |
608 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); | |
609 | restart: | |
610 | rt = fn->leaf; | |
dd3abc4e | 611 | rt = rt6_device_match(net, rt, &fl->fl6_src, fl->oif, flags); |
8ed67789 | 612 | BACKTRACK(net, &fl->fl6_src); |
c71099ac | 613 | out: |
d8d1f30b | 614 | dst_use(&rt->dst, jiffies); |
c71099ac | 615 | read_unlock_bh(&table->tb6_lock); |
c71099ac TG |
616 | return rt; |
617 | ||
618 | } | |
619 | ||
9acd9f3a YH |
620 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
621 | const struct in6_addr *saddr, int oif, int strict) | |
c71099ac TG |
622 | { |
623 | struct flowi fl = { | |
624 | .oif = oif, | |
5811662b | 625 | .fl6_dst = *daddr, |
c71099ac TG |
626 | }; |
627 | struct dst_entry *dst; | |
77d16f45 | 628 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
c71099ac | 629 | |
adaa70bb TG |
630 | if (saddr) { |
631 | memcpy(&fl.fl6_src, saddr, sizeof(*saddr)); | |
632 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
633 | } | |
634 | ||
606a2b48 | 635 | dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup); |
c71099ac TG |
636 | if (dst->error == 0) |
637 | return (struct rt6_info *) dst; | |
638 | ||
639 | dst_release(dst); | |
640 | ||
1da177e4 LT |
641 | return NULL; |
642 | } | |
643 | ||
7159039a YH |
644 | EXPORT_SYMBOL(rt6_lookup); |
645 | ||
c71099ac | 646 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
1da177e4 LT |
647 | It takes new route entry, the addition fails by any reason the |
648 | route is freed. In any case, if caller does not hold it, it may | |
649 | be destroyed. | |
650 | */ | |
651 | ||
86872cb5 | 652 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
653 | { |
654 | int err; | |
c71099ac | 655 | struct fib6_table *table; |
1da177e4 | 656 | |
c71099ac TG |
657 | table = rt->rt6i_table; |
658 | write_lock_bh(&table->tb6_lock); | |
86872cb5 | 659 | err = fib6_add(&table->tb6_root, rt, info); |
c71099ac | 660 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
661 | |
662 | return err; | |
663 | } | |
664 | ||
40e22e8f TG |
665 | int ip6_ins_rt(struct rt6_info *rt) |
666 | { | |
4d1169c1 | 667 | struct nl_info info = { |
c346dca1 | 668 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 669 | }; |
528c4ceb | 670 | return __ip6_ins_rt(rt, &info); |
40e22e8f TG |
671 | } |
672 | ||
95a9a5ba YH |
673 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
674 | struct in6_addr *saddr) | |
1da177e4 | 675 | { |
1da177e4 LT |
676 | struct rt6_info *rt; |
677 | ||
678 | /* | |
679 | * Clone the route. | |
680 | */ | |
681 | ||
682 | rt = ip6_rt_copy(ort); | |
683 | ||
684 | if (rt) { | |
14deae41 DM |
685 | struct neighbour *neigh; |
686 | int attempts = !in_softirq(); | |
687 | ||
58c4fb86 YH |
688 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
689 | if (rt->rt6i_dst.plen != 128 && | |
690 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) | |
691 | rt->rt6i_flags |= RTF_ANYCAST; | |
1da177e4 | 692 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
58c4fb86 | 693 | } |
1da177e4 | 694 | |
58c4fb86 | 695 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
1da177e4 LT |
696 | rt->rt6i_dst.plen = 128; |
697 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 698 | rt->dst.flags |= DST_HOST; |
1da177e4 LT |
699 | |
700 | #ifdef CONFIG_IPV6_SUBTREES | |
701 | if (rt->rt6i_src.plen && saddr) { | |
702 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); | |
703 | rt->rt6i_src.plen = 128; | |
704 | } | |
705 | #endif | |
706 | ||
14deae41 DM |
707 | retry: |
708 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); | |
709 | if (IS_ERR(neigh)) { | |
710 | struct net *net = dev_net(rt->rt6i_dev); | |
711 | int saved_rt_min_interval = | |
712 | net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
713 | int saved_rt_elasticity = | |
714 | net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
715 | ||
716 | if (attempts-- > 0) { | |
717 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; | |
718 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; | |
719 | ||
86393e52 | 720 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
14deae41 DM |
721 | |
722 | net->ipv6.sysctl.ip6_rt_gc_elasticity = | |
723 | saved_rt_elasticity; | |
724 | net->ipv6.sysctl.ip6_rt_gc_min_interval = | |
725 | saved_rt_min_interval; | |
726 | goto retry; | |
727 | } | |
728 | ||
729 | if (net_ratelimit()) | |
730 | printk(KERN_WARNING | |
7e1b33e5 | 731 | "ipv6: Neighbour table overflow.\n"); |
d8d1f30b | 732 | dst_free(&rt->dst); |
14deae41 DM |
733 | return NULL; |
734 | } | |
735 | rt->rt6i_nexthop = neigh; | |
1da177e4 | 736 | |
95a9a5ba | 737 | } |
1da177e4 | 738 | |
95a9a5ba YH |
739 | return rt; |
740 | } | |
1da177e4 | 741 | |
299d9939 YH |
742 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
743 | { | |
744 | struct rt6_info *rt = ip6_rt_copy(ort); | |
745 | if (rt) { | |
746 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); | |
747 | rt->rt6i_dst.plen = 128; | |
748 | rt->rt6i_flags |= RTF_CACHE; | |
d8d1f30b | 749 | rt->dst.flags |= DST_HOST; |
299d9939 YH |
750 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); |
751 | } | |
752 | return rt; | |
753 | } | |
754 | ||
8ed67789 DL |
755 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
756 | struct flowi *fl, int flags) | |
1da177e4 LT |
757 | { |
758 | struct fib6_node *fn; | |
519fbd87 | 759 | struct rt6_info *rt, *nrt; |
c71099ac | 760 | int strict = 0; |
1da177e4 | 761 | int attempts = 3; |
519fbd87 | 762 | int err; |
53b7997f | 763 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
1da177e4 | 764 | |
77d16f45 | 765 | strict |= flags & RT6_LOOKUP_F_IFACE; |
1da177e4 LT |
766 | |
767 | relookup: | |
c71099ac | 768 | read_lock_bh(&table->tb6_lock); |
1da177e4 | 769 | |
8238dd06 | 770 | restart_2: |
c71099ac | 771 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
1da177e4 LT |
772 | |
773 | restart: | |
4acad72d | 774 | rt = rt6_select(fn, oif, strict | reachable); |
8ed67789 DL |
775 | |
776 | BACKTRACK(net, &fl->fl6_src); | |
777 | if (rt == net->ipv6.ip6_null_entry || | |
8238dd06 | 778 | rt->rt6i_flags & RTF_CACHE) |
1ddef044 | 779 | goto out; |
1da177e4 | 780 | |
d8d1f30b | 781 | dst_hold(&rt->dst); |
c71099ac | 782 | read_unlock_bh(&table->tb6_lock); |
fb9de91e | 783 | |
519fbd87 | 784 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
c71099ac | 785 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
d80bc0fd | 786 | else |
c71099ac | 787 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
e40cf353 | 788 | |
d8d1f30b | 789 | dst_release(&rt->dst); |
8ed67789 | 790 | rt = nrt ? : net->ipv6.ip6_null_entry; |
1da177e4 | 791 | |
d8d1f30b | 792 | dst_hold(&rt->dst); |
519fbd87 | 793 | if (nrt) { |
40e22e8f | 794 | err = ip6_ins_rt(nrt); |
519fbd87 | 795 | if (!err) |
1da177e4 | 796 | goto out2; |
1da177e4 | 797 | } |
1da177e4 | 798 | |
519fbd87 YH |
799 | if (--attempts <= 0) |
800 | goto out2; | |
801 | ||
802 | /* | |
c71099ac | 803 | * Race condition! In the gap, when table->tb6_lock was |
519fbd87 YH |
804 | * released someone could insert this route. Relookup. |
805 | */ | |
d8d1f30b | 806 | dst_release(&rt->dst); |
519fbd87 YH |
807 | goto relookup; |
808 | ||
809 | out: | |
8238dd06 YH |
810 | if (reachable) { |
811 | reachable = 0; | |
812 | goto restart_2; | |
813 | } | |
d8d1f30b | 814 | dst_hold(&rt->dst); |
c71099ac | 815 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 816 | out2: |
d8d1f30b CG |
817 | rt->dst.lastuse = jiffies; |
818 | rt->dst.__use++; | |
c71099ac TG |
819 | |
820 | return rt; | |
1da177e4 LT |
821 | } |
822 | ||
8ed67789 | 823 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
4acad72d PE |
824 | struct flowi *fl, int flags) |
825 | { | |
8ed67789 | 826 | return ip6_pol_route(net, table, fl->iif, fl, flags); |
4acad72d PE |
827 | } |
828 | ||
c71099ac TG |
829 | void ip6_route_input(struct sk_buff *skb) |
830 | { | |
0660e03f | 831 | struct ipv6hdr *iph = ipv6_hdr(skb); |
c346dca1 | 832 | struct net *net = dev_net(skb->dev); |
adaa70bb | 833 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c71099ac TG |
834 | struct flowi fl = { |
835 | .iif = skb->dev->ifindex, | |
5811662b CG |
836 | .fl6_dst = iph->daddr, |
837 | .fl6_src = iph->saddr, | |
838 | .fl6_flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK, | |
1ab1457c | 839 | .mark = skb->mark, |
c71099ac TG |
840 | .proto = iph->nexthdr, |
841 | }; | |
adaa70bb | 842 | |
1d6e55f1 | 843 | if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG) |
adaa70bb | 844 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 845 | |
adf30907 | 846 | skb_dst_set(skb, fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input)); |
c71099ac TG |
847 | } |
848 | ||
8ed67789 | 849 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
c71099ac | 850 | struct flowi *fl, int flags) |
1da177e4 | 851 | { |
8ed67789 | 852 | return ip6_pol_route(net, table, fl->oif, fl, flags); |
c71099ac TG |
853 | } |
854 | ||
4591db4f DL |
855 | struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, |
856 | struct flowi *fl) | |
c71099ac TG |
857 | { |
858 | int flags = 0; | |
859 | ||
6057fd78 | 860 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl->fl6_dst)) |
77d16f45 | 861 | flags |= RT6_LOOKUP_F_IFACE; |
c71099ac | 862 | |
adaa70bb TG |
863 | if (!ipv6_addr_any(&fl->fl6_src)) |
864 | flags |= RT6_LOOKUP_F_HAS_SADDR; | |
0c9a2ac1 YH |
865 | else if (sk) |
866 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); | |
adaa70bb | 867 | |
4591db4f | 868 | return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); |
1da177e4 LT |
869 | } |
870 | ||
7159039a | 871 | EXPORT_SYMBOL(ip6_route_output); |
1da177e4 | 872 | |
69ead7af | 873 | struct dst_entry *ip6_dst_blackhole(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 874 | { |
69ead7af DM |
875 | struct rt6_info *rt = dst_alloc(&ip6_dst_blackhole_ops, 1); |
876 | struct rt6_info *ort = (struct rt6_info *) dst_orig; | |
14e50e57 DM |
877 | struct dst_entry *new = NULL; |
878 | ||
879 | if (rt) { | |
d8d1f30b | 880 | new = &rt->dst; |
14e50e57 | 881 | |
14e50e57 | 882 | new->__use = 1; |
352e512c HX |
883 | new->input = dst_discard; |
884 | new->output = dst_discard; | |
14e50e57 | 885 | |
defb3519 | 886 | dst_copy_metrics(new, &ort->dst); |
d8d1f30b | 887 | new->dev = ort->dst.dev; |
14e50e57 DM |
888 | if (new->dev) |
889 | dev_hold(new->dev); | |
890 | rt->rt6i_idev = ort->rt6i_idev; | |
891 | if (rt->rt6i_idev) | |
892 | in6_dev_hold(rt->rt6i_idev); | |
893 | rt->rt6i_expires = 0; | |
894 | ||
895 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
896 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
897 | rt->rt6i_metric = 0; | |
898 | ||
899 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
900 | #ifdef CONFIG_IPV6_SUBTREES | |
901 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
902 | #endif | |
903 | ||
904 | dst_free(new); | |
905 | } | |
906 | ||
69ead7af DM |
907 | dst_release(dst_orig); |
908 | return new ? new : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
909 | } |
910 | EXPORT_SYMBOL_GPL(ip6_dst_blackhole); | |
911 | ||
1da177e4 LT |
912 | /* |
913 | * Destination cache support functions | |
914 | */ | |
915 | ||
916 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) | |
917 | { | |
918 | struct rt6_info *rt; | |
919 | ||
920 | rt = (struct rt6_info *) dst; | |
921 | ||
6431cbc2 DM |
922 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
923 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { | |
924 | if (!rt->rt6i_peer) | |
925 | rt6_bind_peer(rt, 0); | |
926 | rt->rt6i_peer_genid = rt6_peer_genid(); | |
927 | } | |
1da177e4 | 928 | return dst; |
6431cbc2 | 929 | } |
1da177e4 LT |
930 | return NULL; |
931 | } | |
932 | ||
933 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) | |
934 | { | |
935 | struct rt6_info *rt = (struct rt6_info *) dst; | |
936 | ||
937 | if (rt) { | |
54c1a859 YH |
938 | if (rt->rt6i_flags & RTF_CACHE) { |
939 | if (rt6_check_expired(rt)) { | |
940 | ip6_del_rt(rt); | |
941 | dst = NULL; | |
942 | } | |
943 | } else { | |
1da177e4 | 944 | dst_release(dst); |
54c1a859 YH |
945 | dst = NULL; |
946 | } | |
1da177e4 | 947 | } |
54c1a859 | 948 | return dst; |
1da177e4 LT |
949 | } |
950 | ||
951 | static void ip6_link_failure(struct sk_buff *skb) | |
952 | { | |
953 | struct rt6_info *rt; | |
954 | ||
3ffe533c | 955 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
1da177e4 | 956 | |
adf30907 | 957 | rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
958 | if (rt) { |
959 | if (rt->rt6i_flags&RTF_CACHE) { | |
d8d1f30b | 960 | dst_set_expires(&rt->dst, 0); |
1da177e4 LT |
961 | rt->rt6i_flags |= RTF_EXPIRES; |
962 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) | |
963 | rt->rt6i_node->fn_sernum = -1; | |
964 | } | |
965 | } | |
966 | ||
967 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) | |
968 | { | |
969 | struct rt6_info *rt6 = (struct rt6_info*)dst; | |
970 | ||
971 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { | |
972 | rt6->rt6i_flags |= RTF_MODIFIED; | |
973 | if (mtu < IPV6_MIN_MTU) { | |
defb3519 | 974 | u32 features = dst_metric(dst, RTAX_FEATURES); |
1da177e4 | 975 | mtu = IPV6_MIN_MTU; |
defb3519 DM |
976 | features |= RTAX_FEATURE_ALLFRAG; |
977 | dst_metric_set(dst, RTAX_FEATURES, features); | |
1da177e4 | 978 | } |
defb3519 | 979 | dst_metric_set(dst, RTAX_MTU, mtu); |
1da177e4 LT |
980 | } |
981 | } | |
982 | ||
0dbaee3b | 983 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
1da177e4 | 984 | { |
0dbaee3b DM |
985 | struct net_device *dev = dst->dev; |
986 | unsigned int mtu = dst_mtu(dst); | |
987 | struct net *net = dev_net(dev); | |
988 | ||
1da177e4 LT |
989 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
990 | ||
5578689a DL |
991 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
992 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; | |
1da177e4 LT |
993 | |
994 | /* | |
1ab1457c YH |
995 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
996 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. | |
997 | * IPV6_MAXPLEN is also valid and means: "any MSS, | |
1da177e4 LT |
998 | * rely only on pmtu discovery" |
999 | */ | |
1000 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) | |
1001 | mtu = IPV6_MAXPLEN; | |
1002 | return mtu; | |
1003 | } | |
1004 | ||
d33e4553 DM |
1005 | static unsigned int ip6_default_mtu(const struct dst_entry *dst) |
1006 | { | |
1007 | unsigned int mtu = IPV6_MIN_MTU; | |
1008 | struct inet6_dev *idev; | |
1009 | ||
1010 | rcu_read_lock(); | |
1011 | idev = __in6_dev_get(dst->dev); | |
1012 | if (idev) | |
1013 | mtu = idev->cnf.mtu6; | |
1014 | rcu_read_unlock(); | |
1015 | ||
1016 | return mtu; | |
1017 | } | |
1018 | ||
3b00944c YH |
1019 | static struct dst_entry *icmp6_dst_gc_list; |
1020 | static DEFINE_SPINLOCK(icmp6_dst_lock); | |
5d0bbeeb | 1021 | |
3b00944c | 1022 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
1da177e4 | 1023 | struct neighbour *neigh, |
9acd9f3a | 1024 | const struct in6_addr *addr) |
1da177e4 LT |
1025 | { |
1026 | struct rt6_info *rt; | |
1027 | struct inet6_dev *idev = in6_dev_get(dev); | |
c346dca1 | 1028 | struct net *net = dev_net(dev); |
1da177e4 LT |
1029 | |
1030 | if (unlikely(idev == NULL)) | |
1031 | return NULL; | |
1032 | ||
86393e52 | 1033 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1034 | if (unlikely(rt == NULL)) { |
1035 | in6_dev_put(idev); | |
1036 | goto out; | |
1037 | } | |
1038 | ||
1039 | dev_hold(dev); | |
1040 | if (neigh) | |
1041 | neigh_hold(neigh); | |
14deae41 | 1042 | else { |
1da177e4 | 1043 | neigh = ndisc_get_neigh(dev, addr); |
14deae41 DM |
1044 | if (IS_ERR(neigh)) |
1045 | neigh = NULL; | |
1046 | } | |
1da177e4 LT |
1047 | |
1048 | rt->rt6i_dev = dev; | |
1049 | rt->rt6i_idev = idev; | |
1050 | rt->rt6i_nexthop = neigh; | |
d8d1f30b | 1051 | atomic_set(&rt->dst.__refcnt, 1); |
defb3519 | 1052 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
d8d1f30b | 1053 | rt->dst.output = ip6_output; |
1da177e4 LT |
1054 | |
1055 | #if 0 /* there's no chance to use these for ndisc */ | |
d8d1f30b | 1056 | rt->dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
1ab1457c | 1057 | ? DST_HOST |
1da177e4 LT |
1058 | : 0; |
1059 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
1060 | rt->rt6i_dst.plen = 128; | |
1061 | #endif | |
1062 | ||
3b00944c | 1063 | spin_lock_bh(&icmp6_dst_lock); |
d8d1f30b CG |
1064 | rt->dst.next = icmp6_dst_gc_list; |
1065 | icmp6_dst_gc_list = &rt->dst; | |
3b00944c | 1066 | spin_unlock_bh(&icmp6_dst_lock); |
1da177e4 | 1067 | |
5578689a | 1068 | fib6_force_start_gc(net); |
1da177e4 LT |
1069 | |
1070 | out: | |
d8d1f30b | 1071 | return &rt->dst; |
1da177e4 LT |
1072 | } |
1073 | ||
3d0f24a7 | 1074 | int icmp6_dst_gc(void) |
1da177e4 | 1075 | { |
e9476e95 | 1076 | struct dst_entry *dst, **pprev; |
3d0f24a7 | 1077 | int more = 0; |
1da177e4 | 1078 | |
3b00944c YH |
1079 | spin_lock_bh(&icmp6_dst_lock); |
1080 | pprev = &icmp6_dst_gc_list; | |
5d0bbeeb | 1081 | |
1da177e4 LT |
1082 | while ((dst = *pprev) != NULL) { |
1083 | if (!atomic_read(&dst->__refcnt)) { | |
1084 | *pprev = dst->next; | |
1085 | dst_free(dst); | |
1da177e4 LT |
1086 | } else { |
1087 | pprev = &dst->next; | |
3d0f24a7 | 1088 | ++more; |
1da177e4 LT |
1089 | } |
1090 | } | |
1091 | ||
3b00944c | 1092 | spin_unlock_bh(&icmp6_dst_lock); |
5d0bbeeb | 1093 | |
3d0f24a7 | 1094 | return more; |
1da177e4 LT |
1095 | } |
1096 | ||
1e493d19 DM |
1097 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
1098 | void *arg) | |
1099 | { | |
1100 | struct dst_entry *dst, **pprev; | |
1101 | ||
1102 | spin_lock_bh(&icmp6_dst_lock); | |
1103 | pprev = &icmp6_dst_gc_list; | |
1104 | while ((dst = *pprev) != NULL) { | |
1105 | struct rt6_info *rt = (struct rt6_info *) dst; | |
1106 | if (func(rt, arg)) { | |
1107 | *pprev = dst->next; | |
1108 | dst_free(dst); | |
1109 | } else { | |
1110 | pprev = &dst->next; | |
1111 | } | |
1112 | } | |
1113 | spin_unlock_bh(&icmp6_dst_lock); | |
1114 | } | |
1115 | ||
569d3645 | 1116 | static int ip6_dst_gc(struct dst_ops *ops) |
1da177e4 | 1117 | { |
1da177e4 | 1118 | unsigned long now = jiffies; |
86393e52 | 1119 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
7019b78e DL |
1120 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
1121 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; | |
1122 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
1123 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; | |
1124 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; | |
fc66f95c | 1125 | int entries; |
7019b78e | 1126 | |
fc66f95c | 1127 | entries = dst_entries_get_fast(ops); |
7019b78e | 1128 | if (time_after(rt_last_gc + rt_min_interval, now) && |
fc66f95c | 1129 | entries <= rt_max_size) |
1da177e4 LT |
1130 | goto out; |
1131 | ||
6891a346 BT |
1132 | net->ipv6.ip6_rt_gc_expire++; |
1133 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); | |
1134 | net->ipv6.ip6_rt_last_gc = now; | |
fc66f95c ED |
1135 | entries = dst_entries_get_slow(ops); |
1136 | if (entries < ops->gc_thresh) | |
7019b78e | 1137 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
1da177e4 | 1138 | out: |
7019b78e | 1139 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
fc66f95c | 1140 | return entries > rt_max_size; |
1da177e4 LT |
1141 | } |
1142 | ||
1143 | /* Clean host part of a prefix. Not necessary in radix tree, | |
1144 | but results in cleaner routing tables. | |
1145 | ||
1146 | Remove it only when all the things will work! | |
1147 | */ | |
1148 | ||
6b75d090 | 1149 | int ip6_dst_hoplimit(struct dst_entry *dst) |
1da177e4 | 1150 | { |
5170ae82 | 1151 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
a02e4b7d | 1152 | if (hoplimit == 0) { |
6b75d090 | 1153 | struct net_device *dev = dst->dev; |
c68f24cc ED |
1154 | struct inet6_dev *idev; |
1155 | ||
1156 | rcu_read_lock(); | |
1157 | idev = __in6_dev_get(dev); | |
1158 | if (idev) | |
6b75d090 | 1159 | hoplimit = idev->cnf.hop_limit; |
c68f24cc | 1160 | else |
53b7997f | 1161 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
c68f24cc | 1162 | rcu_read_unlock(); |
1da177e4 LT |
1163 | } |
1164 | return hoplimit; | |
1165 | } | |
abbf46ae | 1166 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
1da177e4 LT |
1167 | |
1168 | /* | |
1169 | * | |
1170 | */ | |
1171 | ||
86872cb5 | 1172 | int ip6_route_add(struct fib6_config *cfg) |
1da177e4 LT |
1173 | { |
1174 | int err; | |
5578689a | 1175 | struct net *net = cfg->fc_nlinfo.nl_net; |
1da177e4 LT |
1176 | struct rt6_info *rt = NULL; |
1177 | struct net_device *dev = NULL; | |
1178 | struct inet6_dev *idev = NULL; | |
c71099ac | 1179 | struct fib6_table *table; |
1da177e4 LT |
1180 | int addr_type; |
1181 | ||
86872cb5 | 1182 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
1da177e4 LT |
1183 | return -EINVAL; |
1184 | #ifndef CONFIG_IPV6_SUBTREES | |
86872cb5 | 1185 | if (cfg->fc_src_len) |
1da177e4 LT |
1186 | return -EINVAL; |
1187 | #endif | |
86872cb5 | 1188 | if (cfg->fc_ifindex) { |
1da177e4 | 1189 | err = -ENODEV; |
5578689a | 1190 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
1da177e4 LT |
1191 | if (!dev) |
1192 | goto out; | |
1193 | idev = in6_dev_get(dev); | |
1194 | if (!idev) | |
1195 | goto out; | |
1196 | } | |
1197 | ||
86872cb5 TG |
1198 | if (cfg->fc_metric == 0) |
1199 | cfg->fc_metric = IP6_RT_PRIO_USER; | |
1da177e4 | 1200 | |
5578689a | 1201 | table = fib6_new_table(net, cfg->fc_table); |
c71099ac TG |
1202 | if (table == NULL) { |
1203 | err = -ENOBUFS; | |
1204 | goto out; | |
1205 | } | |
1206 | ||
86393e52 | 1207 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1208 | |
1209 | if (rt == NULL) { | |
1210 | err = -ENOMEM; | |
1211 | goto out; | |
1212 | } | |
1213 | ||
d8d1f30b | 1214 | rt->dst.obsolete = -1; |
6f704992 YH |
1215 | rt->rt6i_expires = (cfg->fc_flags & RTF_EXPIRES) ? |
1216 | jiffies + clock_t_to_jiffies(cfg->fc_expires) : | |
1217 | 0; | |
1da177e4 | 1218 | |
86872cb5 TG |
1219 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
1220 | cfg->fc_protocol = RTPROT_BOOT; | |
1221 | rt->rt6i_protocol = cfg->fc_protocol; | |
1222 | ||
1223 | addr_type = ipv6_addr_type(&cfg->fc_dst); | |
1da177e4 LT |
1224 | |
1225 | if (addr_type & IPV6_ADDR_MULTICAST) | |
d8d1f30b | 1226 | rt->dst.input = ip6_mc_input; |
ab79ad14 MŻ |
1227 | else if (cfg->fc_flags & RTF_LOCAL) |
1228 | rt->dst.input = ip6_input; | |
1da177e4 | 1229 | else |
d8d1f30b | 1230 | rt->dst.input = ip6_forward; |
1da177e4 | 1231 | |
d8d1f30b | 1232 | rt->dst.output = ip6_output; |
1da177e4 | 1233 | |
86872cb5 TG |
1234 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
1235 | rt->rt6i_dst.plen = cfg->fc_dst_len; | |
1da177e4 | 1236 | if (rt->rt6i_dst.plen == 128) |
d8d1f30b | 1237 | rt->dst.flags = DST_HOST; |
1da177e4 LT |
1238 | |
1239 | #ifdef CONFIG_IPV6_SUBTREES | |
86872cb5 TG |
1240 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
1241 | rt->rt6i_src.plen = cfg->fc_src_len; | |
1da177e4 LT |
1242 | #endif |
1243 | ||
86872cb5 | 1244 | rt->rt6i_metric = cfg->fc_metric; |
1da177e4 LT |
1245 | |
1246 | /* We cannot add true routes via loopback here, | |
1247 | they would result in kernel looping; promote them to reject routes | |
1248 | */ | |
86872cb5 | 1249 | if ((cfg->fc_flags & RTF_REJECT) || |
ab79ad14 MŻ |
1250 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK) |
1251 | && !(cfg->fc_flags&RTF_LOCAL))) { | |
1da177e4 | 1252 | /* hold loopback dev/idev if we haven't done so. */ |
5578689a | 1253 | if (dev != net->loopback_dev) { |
1da177e4 LT |
1254 | if (dev) { |
1255 | dev_put(dev); | |
1256 | in6_dev_put(idev); | |
1257 | } | |
5578689a | 1258 | dev = net->loopback_dev; |
1da177e4 LT |
1259 | dev_hold(dev); |
1260 | idev = in6_dev_get(dev); | |
1261 | if (!idev) { | |
1262 | err = -ENODEV; | |
1263 | goto out; | |
1264 | } | |
1265 | } | |
d8d1f30b CG |
1266 | rt->dst.output = ip6_pkt_discard_out; |
1267 | rt->dst.input = ip6_pkt_discard; | |
1268 | rt->dst.error = -ENETUNREACH; | |
1da177e4 LT |
1269 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
1270 | goto install_route; | |
1271 | } | |
1272 | ||
86872cb5 | 1273 | if (cfg->fc_flags & RTF_GATEWAY) { |
1da177e4 LT |
1274 | struct in6_addr *gw_addr; |
1275 | int gwa_type; | |
1276 | ||
86872cb5 TG |
1277 | gw_addr = &cfg->fc_gateway; |
1278 | ipv6_addr_copy(&rt->rt6i_gateway, gw_addr); | |
1da177e4 LT |
1279 | gwa_type = ipv6_addr_type(gw_addr); |
1280 | ||
1281 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { | |
1282 | struct rt6_info *grt; | |
1283 | ||
1284 | /* IPv6 strictly inhibits using not link-local | |
1285 | addresses as nexthop address. | |
1286 | Otherwise, router will not able to send redirects. | |
1287 | It is very good, but in some (rare!) circumstances | |
1288 | (SIT, PtP, NBMA NOARP links) it is handy to allow | |
1289 | some exceptions. --ANK | |
1290 | */ | |
1291 | err = -EINVAL; | |
1292 | if (!(gwa_type&IPV6_ADDR_UNICAST)) | |
1293 | goto out; | |
1294 | ||
5578689a | 1295 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
1da177e4 LT |
1296 | |
1297 | err = -EHOSTUNREACH; | |
1298 | if (grt == NULL) | |
1299 | goto out; | |
1300 | if (dev) { | |
1301 | if (dev != grt->rt6i_dev) { | |
d8d1f30b | 1302 | dst_release(&grt->dst); |
1da177e4 LT |
1303 | goto out; |
1304 | } | |
1305 | } else { | |
1306 | dev = grt->rt6i_dev; | |
1307 | idev = grt->rt6i_idev; | |
1308 | dev_hold(dev); | |
1309 | in6_dev_hold(grt->rt6i_idev); | |
1310 | } | |
1311 | if (!(grt->rt6i_flags&RTF_GATEWAY)) | |
1312 | err = 0; | |
d8d1f30b | 1313 | dst_release(&grt->dst); |
1da177e4 LT |
1314 | |
1315 | if (err) | |
1316 | goto out; | |
1317 | } | |
1318 | err = -EINVAL; | |
1319 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) | |
1320 | goto out; | |
1321 | } | |
1322 | ||
1323 | err = -ENODEV; | |
1324 | if (dev == NULL) | |
1325 | goto out; | |
1326 | ||
86872cb5 | 1327 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
1da177e4 LT |
1328 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
1329 | if (IS_ERR(rt->rt6i_nexthop)) { | |
1330 | err = PTR_ERR(rt->rt6i_nexthop); | |
1331 | rt->rt6i_nexthop = NULL; | |
1332 | goto out; | |
1333 | } | |
1334 | } | |
1335 | ||
86872cb5 | 1336 | rt->rt6i_flags = cfg->fc_flags; |
1da177e4 LT |
1337 | |
1338 | install_route: | |
86872cb5 TG |
1339 | if (cfg->fc_mx) { |
1340 | struct nlattr *nla; | |
1341 | int remaining; | |
1342 | ||
1343 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { | |
8f4c1f9b | 1344 | int type = nla_type(nla); |
86872cb5 TG |
1345 | |
1346 | if (type) { | |
1347 | if (type > RTAX_MAX) { | |
1da177e4 LT |
1348 | err = -EINVAL; |
1349 | goto out; | |
1350 | } | |
86872cb5 | 1351 | |
defb3519 | 1352 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
1da177e4 | 1353 | } |
1da177e4 LT |
1354 | } |
1355 | } | |
1356 | ||
d8d1f30b | 1357 | rt->dst.dev = dev; |
1da177e4 | 1358 | rt->rt6i_idev = idev; |
c71099ac | 1359 | rt->rt6i_table = table; |
63152fc0 | 1360 | |
c346dca1 | 1361 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
63152fc0 | 1362 | |
86872cb5 | 1363 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1364 | |
1365 | out: | |
1366 | if (dev) | |
1367 | dev_put(dev); | |
1368 | if (idev) | |
1369 | in6_dev_put(idev); | |
1370 | if (rt) | |
d8d1f30b | 1371 | dst_free(&rt->dst); |
1da177e4 LT |
1372 | return err; |
1373 | } | |
1374 | ||
86872cb5 | 1375 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
1376 | { |
1377 | int err; | |
c71099ac | 1378 | struct fib6_table *table; |
c346dca1 | 1379 | struct net *net = dev_net(rt->rt6i_dev); |
1da177e4 | 1380 | |
8ed67789 | 1381 | if (rt == net->ipv6.ip6_null_entry) |
6c813a72 PM |
1382 | return -ENOENT; |
1383 | ||
c71099ac TG |
1384 | table = rt->rt6i_table; |
1385 | write_lock_bh(&table->tb6_lock); | |
1da177e4 | 1386 | |
86872cb5 | 1387 | err = fib6_del(rt, info); |
d8d1f30b | 1388 | dst_release(&rt->dst); |
1da177e4 | 1389 | |
c71099ac | 1390 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1391 | |
1392 | return err; | |
1393 | } | |
1394 | ||
e0a1ad73 TG |
1395 | int ip6_del_rt(struct rt6_info *rt) |
1396 | { | |
4d1169c1 | 1397 | struct nl_info info = { |
c346dca1 | 1398 | .nl_net = dev_net(rt->rt6i_dev), |
4d1169c1 | 1399 | }; |
528c4ceb | 1400 | return __ip6_del_rt(rt, &info); |
e0a1ad73 TG |
1401 | } |
1402 | ||
86872cb5 | 1403 | static int ip6_route_del(struct fib6_config *cfg) |
1da177e4 | 1404 | { |
c71099ac | 1405 | struct fib6_table *table; |
1da177e4 LT |
1406 | struct fib6_node *fn; |
1407 | struct rt6_info *rt; | |
1408 | int err = -ESRCH; | |
1409 | ||
5578689a | 1410 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
c71099ac TG |
1411 | if (table == NULL) |
1412 | return err; | |
1413 | ||
1414 | read_lock_bh(&table->tb6_lock); | |
1da177e4 | 1415 | |
c71099ac | 1416 | fn = fib6_locate(&table->tb6_root, |
86872cb5 TG |
1417 | &cfg->fc_dst, cfg->fc_dst_len, |
1418 | &cfg->fc_src, cfg->fc_src_len); | |
1ab1457c | 1419 | |
1da177e4 | 1420 | if (fn) { |
d8d1f30b | 1421 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
86872cb5 | 1422 | if (cfg->fc_ifindex && |
1da177e4 | 1423 | (rt->rt6i_dev == NULL || |
86872cb5 | 1424 | rt->rt6i_dev->ifindex != cfg->fc_ifindex)) |
1da177e4 | 1425 | continue; |
86872cb5 TG |
1426 | if (cfg->fc_flags & RTF_GATEWAY && |
1427 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) | |
1da177e4 | 1428 | continue; |
86872cb5 | 1429 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
1da177e4 | 1430 | continue; |
d8d1f30b | 1431 | dst_hold(&rt->dst); |
c71099ac | 1432 | read_unlock_bh(&table->tb6_lock); |
1da177e4 | 1433 | |
86872cb5 | 1434 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
1da177e4 LT |
1435 | } |
1436 | } | |
c71099ac | 1437 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1438 | |
1439 | return err; | |
1440 | } | |
1441 | ||
1442 | /* | |
1443 | * Handle redirects | |
1444 | */ | |
a6279458 YH |
1445 | struct ip6rd_flowi { |
1446 | struct flowi fl; | |
1447 | struct in6_addr gateway; | |
1448 | }; | |
1449 | ||
8ed67789 DL |
1450 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
1451 | struct fib6_table *table, | |
a6279458 YH |
1452 | struct flowi *fl, |
1453 | int flags) | |
1da177e4 | 1454 | { |
a6279458 YH |
1455 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl; |
1456 | struct rt6_info *rt; | |
e843b9e1 | 1457 | struct fib6_node *fn; |
c71099ac | 1458 | |
1da177e4 | 1459 | /* |
e843b9e1 YH |
1460 | * Get the "current" route for this destination and |
1461 | * check if the redirect has come from approriate router. | |
1462 | * | |
1463 | * RFC 2461 specifies that redirects should only be | |
1464 | * accepted if they come from the nexthop to the target. | |
1465 | * Due to the way the routes are chosen, this notion | |
1466 | * is a bit fuzzy and one might need to check all possible | |
1467 | * routes. | |
1da177e4 | 1468 | */ |
1da177e4 | 1469 | |
c71099ac | 1470 | read_lock_bh(&table->tb6_lock); |
a6279458 | 1471 | fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src); |
e843b9e1 | 1472 | restart: |
d8d1f30b | 1473 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
e843b9e1 YH |
1474 | /* |
1475 | * Current route is on-link; redirect is always invalid. | |
1476 | * | |
1477 | * Seems, previous statement is not true. It could | |
1478 | * be node, which looks for us as on-link (f.e. proxy ndisc) | |
1479 | * But then router serving it might decide, that we should | |
1480 | * know truth 8)8) --ANK (980726). | |
1481 | */ | |
1482 | if (rt6_check_expired(rt)) | |
1483 | continue; | |
1484 | if (!(rt->rt6i_flags & RTF_GATEWAY)) | |
1485 | continue; | |
a6279458 | 1486 | if (fl->oif != rt->rt6i_dev->ifindex) |
e843b9e1 | 1487 | continue; |
a6279458 | 1488 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
e843b9e1 YH |
1489 | continue; |
1490 | break; | |
1491 | } | |
a6279458 | 1492 | |
cb15d9c2 | 1493 | if (!rt) |
8ed67789 DL |
1494 | rt = net->ipv6.ip6_null_entry; |
1495 | BACKTRACK(net, &fl->fl6_src); | |
cb15d9c2 | 1496 | out: |
d8d1f30b | 1497 | dst_hold(&rt->dst); |
a6279458 | 1498 | |
c71099ac | 1499 | read_unlock_bh(&table->tb6_lock); |
e843b9e1 | 1500 | |
a6279458 YH |
1501 | return rt; |
1502 | }; | |
1503 | ||
1504 | static struct rt6_info *ip6_route_redirect(struct in6_addr *dest, | |
1505 | struct in6_addr *src, | |
1506 | struct in6_addr *gateway, | |
1507 | struct net_device *dev) | |
1508 | { | |
adaa70bb | 1509 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
c346dca1 | 1510 | struct net *net = dev_net(dev); |
a6279458 YH |
1511 | struct ip6rd_flowi rdfl = { |
1512 | .fl = { | |
1513 | .oif = dev->ifindex, | |
5811662b CG |
1514 | .fl6_dst = *dest, |
1515 | .fl6_src = *src, | |
a6279458 | 1516 | }, |
a6279458 | 1517 | }; |
adaa70bb | 1518 | |
86c36ce4 BH |
1519 | ipv6_addr_copy(&rdfl.gateway, gateway); |
1520 | ||
adaa70bb TG |
1521 | if (rt6_need_strict(dest)) |
1522 | flags |= RT6_LOOKUP_F_IFACE; | |
a6279458 | 1523 | |
5578689a | 1524 | return (struct rt6_info *)fib6_rule_lookup(net, (struct flowi *)&rdfl, |
58f09b78 | 1525 | flags, __ip6_route_redirect); |
a6279458 YH |
1526 | } |
1527 | ||
1528 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *src, | |
1529 | struct in6_addr *saddr, | |
1530 | struct neighbour *neigh, u8 *lladdr, int on_link) | |
1531 | { | |
1532 | struct rt6_info *rt, *nrt = NULL; | |
1533 | struct netevent_redirect netevent; | |
c346dca1 | 1534 | struct net *net = dev_net(neigh->dev); |
a6279458 YH |
1535 | |
1536 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); | |
1537 | ||
8ed67789 | 1538 | if (rt == net->ipv6.ip6_null_entry) { |
1da177e4 LT |
1539 | if (net_ratelimit()) |
1540 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " | |
1541 | "for redirect target\n"); | |
a6279458 | 1542 | goto out; |
1da177e4 LT |
1543 | } |
1544 | ||
1da177e4 LT |
1545 | /* |
1546 | * We have finally decided to accept it. | |
1547 | */ | |
1548 | ||
1ab1457c | 1549 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1550 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1551 | NEIGH_UPDATE_F_OVERRIDE| | |
1552 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1553 | NEIGH_UPDATE_F_ISROUTER)) | |
1554 | ); | |
1555 | ||
1556 | /* | |
1557 | * Redirect received -> path was valid. | |
1558 | * Look, redirects are sent only in response to data packets, | |
1559 | * so that this nexthop apparently is reachable. --ANK | |
1560 | */ | |
d8d1f30b | 1561 | dst_confirm(&rt->dst); |
1da177e4 LT |
1562 | |
1563 | /* Duplicate redirect: silently ignore. */ | |
d8d1f30b | 1564 | if (neigh == rt->dst.neighbour) |
1da177e4 LT |
1565 | goto out; |
1566 | ||
1567 | nrt = ip6_rt_copy(rt); | |
1568 | if (nrt == NULL) | |
1569 | goto out; | |
1570 | ||
1571 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; | |
1572 | if (on_link) | |
1573 | nrt->rt6i_flags &= ~RTF_GATEWAY; | |
1574 | ||
1575 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); | |
1576 | nrt->rt6i_dst.plen = 128; | |
d8d1f30b | 1577 | nrt->dst.flags |= DST_HOST; |
1da177e4 LT |
1578 | |
1579 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); | |
1580 | nrt->rt6i_nexthop = neigh_clone(neigh); | |
1da177e4 | 1581 | |
40e22e8f | 1582 | if (ip6_ins_rt(nrt)) |
1da177e4 LT |
1583 | goto out; |
1584 | ||
d8d1f30b CG |
1585 | netevent.old = &rt->dst; |
1586 | netevent.new = &nrt->dst; | |
8d71740c TT |
1587 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
1588 | ||
1da177e4 | 1589 | if (rt->rt6i_flags&RTF_CACHE) { |
e0a1ad73 | 1590 | ip6_del_rt(rt); |
1da177e4 LT |
1591 | return; |
1592 | } | |
1593 | ||
1594 | out: | |
d8d1f30b | 1595 | dst_release(&rt->dst); |
1da177e4 LT |
1596 | } |
1597 | ||
1598 | /* | |
1599 | * Handle ICMP "packet too big" messages | |
1600 | * i.e. Path MTU discovery | |
1601 | */ | |
1602 | ||
ae878ae2 MŻ |
1603 | static void rt6_do_pmtu_disc(struct in6_addr *daddr, struct in6_addr *saddr, |
1604 | struct net *net, u32 pmtu, int ifindex) | |
1da177e4 LT |
1605 | { |
1606 | struct rt6_info *rt, *nrt; | |
1607 | int allfrag = 0; | |
d3052b55 | 1608 | again: |
ae878ae2 | 1609 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
1da177e4 LT |
1610 | if (rt == NULL) |
1611 | return; | |
1612 | ||
d3052b55 AV |
1613 | if (rt6_check_expired(rt)) { |
1614 | ip6_del_rt(rt); | |
1615 | goto again; | |
1616 | } | |
1617 | ||
d8d1f30b | 1618 | if (pmtu >= dst_mtu(&rt->dst)) |
1da177e4 LT |
1619 | goto out; |
1620 | ||
1621 | if (pmtu < IPV6_MIN_MTU) { | |
1622 | /* | |
1ab1457c | 1623 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
1da177e4 LT |
1624 | * MTU (1280) and a fragment header should always be included |
1625 | * after a node receiving Too Big message reporting PMTU is | |
1626 | * less than the IPv6 Minimum Link MTU. | |
1627 | */ | |
1628 | pmtu = IPV6_MIN_MTU; | |
1629 | allfrag = 1; | |
1630 | } | |
1631 | ||
1632 | /* New mtu received -> path was valid. | |
1633 | They are sent only in response to data packets, | |
1634 | so that this nexthop apparently is reachable. --ANK | |
1635 | */ | |
d8d1f30b | 1636 | dst_confirm(&rt->dst); |
1da177e4 LT |
1637 | |
1638 | /* Host route. If it is static, it would be better | |
1639 | not to override it, but add new one, so that | |
1640 | when cache entry will expire old pmtu | |
1641 | would return automatically. | |
1642 | */ | |
1643 | if (rt->rt6i_flags & RTF_CACHE) { | |
defb3519 DM |
1644 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
1645 | if (allfrag) { | |
1646 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); | |
1647 | features |= RTAX_FEATURE_ALLFRAG; | |
1648 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); | |
1649 | } | |
d8d1f30b | 1650 | dst_set_expires(&rt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
1da177e4 LT |
1651 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
1652 | goto out; | |
1653 | } | |
1654 | ||
1655 | /* Network route. | |
1656 | Two cases are possible: | |
1657 | 1. It is connected route. Action: COW | |
1658 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. | |
1659 | */ | |
d5315b50 | 1660 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
a1e78363 | 1661 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
d5315b50 YH |
1662 | else |
1663 | nrt = rt6_alloc_clone(rt, daddr); | |
a1e78363 | 1664 | |
d5315b50 | 1665 | if (nrt) { |
defb3519 DM |
1666 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
1667 | if (allfrag) { | |
1668 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); | |
1669 | features |= RTAX_FEATURE_ALLFRAG; | |
1670 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); | |
1671 | } | |
a1e78363 YH |
1672 | |
1673 | /* According to RFC 1981, detecting PMTU increase shouldn't be | |
1674 | * happened within 5 mins, the recommended timer is 10 mins. | |
1675 | * Here this route expiration time is set to ip6_rt_mtu_expires | |
1676 | * which is 10 mins. After 10 mins the decreased pmtu is expired | |
1677 | * and detecting PMTU increase will be automatically happened. | |
1678 | */ | |
d8d1f30b | 1679 | dst_set_expires(&nrt->dst, net->ipv6.sysctl.ip6_rt_mtu_expires); |
a1e78363 YH |
1680 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
1681 | ||
40e22e8f | 1682 | ip6_ins_rt(nrt); |
1da177e4 | 1683 | } |
1da177e4 | 1684 | out: |
d8d1f30b | 1685 | dst_release(&rt->dst); |
1da177e4 LT |
1686 | } |
1687 | ||
ae878ae2 MŻ |
1688 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, |
1689 | struct net_device *dev, u32 pmtu) | |
1690 | { | |
1691 | struct net *net = dev_net(dev); | |
1692 | ||
1693 | /* | |
1694 | * RFC 1981 states that a node "MUST reduce the size of the packets it | |
1695 | * is sending along the path" that caused the Packet Too Big message. | |
1696 | * Since it's not possible in the general case to determine which | |
1697 | * interface was used to send the original packet, we update the MTU | |
1698 | * on the interface that will be used to send future packets. We also | |
1699 | * update the MTU on the interface that received the Packet Too Big in | |
1700 | * case the original packet was forced out that interface with | |
1701 | * SO_BINDTODEVICE or similar. This is the next best thing to the | |
1702 | * correct behaviour, which would be to update the MTU on all | |
1703 | * interfaces. | |
1704 | */ | |
1705 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); | |
1706 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); | |
1707 | } | |
1708 | ||
1da177e4 LT |
1709 | /* |
1710 | * Misc support functions | |
1711 | */ | |
1712 | ||
1713 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) | |
1714 | { | |
c346dca1 | 1715 | struct net *net = dev_net(ort->rt6i_dev); |
86393e52 | 1716 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
1da177e4 LT |
1717 | |
1718 | if (rt) { | |
d8d1f30b CG |
1719 | rt->dst.input = ort->dst.input; |
1720 | rt->dst.output = ort->dst.output; | |
1721 | ||
defb3519 | 1722 | dst_copy_metrics(&rt->dst, &ort->dst); |
d8d1f30b CG |
1723 | rt->dst.error = ort->dst.error; |
1724 | rt->dst.dev = ort->dst.dev; | |
1725 | if (rt->dst.dev) | |
1726 | dev_hold(rt->dst.dev); | |
1da177e4 LT |
1727 | rt->rt6i_idev = ort->rt6i_idev; |
1728 | if (rt->rt6i_idev) | |
1729 | in6_dev_hold(rt->rt6i_idev); | |
d8d1f30b | 1730 | rt->dst.lastuse = jiffies; |
1da177e4 LT |
1731 | rt->rt6i_expires = 0; |
1732 | ||
1733 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); | |
1734 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; | |
1735 | rt->rt6i_metric = 0; | |
1736 | ||
1737 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); | |
1738 | #ifdef CONFIG_IPV6_SUBTREES | |
1739 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); | |
1740 | #endif | |
c71099ac | 1741 | rt->rt6i_table = ort->rt6i_table; |
1da177e4 LT |
1742 | } |
1743 | return rt; | |
1744 | } | |
1745 | ||
70ceb4f5 | 1746 | #ifdef CONFIG_IPV6_ROUTE_INFO |
efa2cea0 DL |
1747 | static struct rt6_info *rt6_get_route_info(struct net *net, |
1748 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1749 | struct in6_addr *gwaddr, int ifindex) |
1750 | { | |
1751 | struct fib6_node *fn; | |
1752 | struct rt6_info *rt = NULL; | |
c71099ac TG |
1753 | struct fib6_table *table; |
1754 | ||
efa2cea0 | 1755 | table = fib6_get_table(net, RT6_TABLE_INFO); |
c71099ac TG |
1756 | if (table == NULL) |
1757 | return NULL; | |
70ceb4f5 | 1758 | |
c71099ac TG |
1759 | write_lock_bh(&table->tb6_lock); |
1760 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); | |
70ceb4f5 YH |
1761 | if (!fn) |
1762 | goto out; | |
1763 | ||
d8d1f30b | 1764 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
70ceb4f5 YH |
1765 | if (rt->rt6i_dev->ifindex != ifindex) |
1766 | continue; | |
1767 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) | |
1768 | continue; | |
1769 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) | |
1770 | continue; | |
d8d1f30b | 1771 | dst_hold(&rt->dst); |
70ceb4f5 YH |
1772 | break; |
1773 | } | |
1774 | out: | |
c71099ac | 1775 | write_unlock_bh(&table->tb6_lock); |
70ceb4f5 YH |
1776 | return rt; |
1777 | } | |
1778 | ||
efa2cea0 DL |
1779 | static struct rt6_info *rt6_add_route_info(struct net *net, |
1780 | struct in6_addr *prefix, int prefixlen, | |
70ceb4f5 YH |
1781 | struct in6_addr *gwaddr, int ifindex, |
1782 | unsigned pref) | |
1783 | { | |
86872cb5 TG |
1784 | struct fib6_config cfg = { |
1785 | .fc_table = RT6_TABLE_INFO, | |
238fc7ea | 1786 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1787 | .fc_ifindex = ifindex, |
1788 | .fc_dst_len = prefixlen, | |
1789 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | | |
1790 | RTF_UP | RTF_PREF(pref), | |
efa2cea0 DL |
1791 | .fc_nlinfo.pid = 0, |
1792 | .fc_nlinfo.nlh = NULL, | |
1793 | .fc_nlinfo.nl_net = net, | |
86872cb5 TG |
1794 | }; |
1795 | ||
1796 | ipv6_addr_copy(&cfg.fc_dst, prefix); | |
1797 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); | |
70ceb4f5 | 1798 | |
e317da96 YH |
1799 | /* We should treat it as a default route if prefix length is 0. */ |
1800 | if (!prefixlen) | |
86872cb5 | 1801 | cfg.fc_flags |= RTF_DEFAULT; |
70ceb4f5 | 1802 | |
86872cb5 | 1803 | ip6_route_add(&cfg); |
70ceb4f5 | 1804 | |
efa2cea0 | 1805 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
70ceb4f5 YH |
1806 | } |
1807 | #endif | |
1808 | ||
1da177e4 | 1809 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
1ab1457c | 1810 | { |
1da177e4 | 1811 | struct rt6_info *rt; |
c71099ac | 1812 | struct fib6_table *table; |
1da177e4 | 1813 | |
c346dca1 | 1814 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
c71099ac TG |
1815 | if (table == NULL) |
1816 | return NULL; | |
1da177e4 | 1817 | |
c71099ac | 1818 | write_lock_bh(&table->tb6_lock); |
d8d1f30b | 1819 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
1da177e4 | 1820 | if (dev == rt->rt6i_dev && |
045927ff | 1821 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
1da177e4 LT |
1822 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
1823 | break; | |
1824 | } | |
1825 | if (rt) | |
d8d1f30b | 1826 | dst_hold(&rt->dst); |
c71099ac | 1827 | write_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1828 | return rt; |
1829 | } | |
1830 | ||
1831 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, | |
ebacaaa0 YH |
1832 | struct net_device *dev, |
1833 | unsigned int pref) | |
1da177e4 | 1834 | { |
86872cb5 TG |
1835 | struct fib6_config cfg = { |
1836 | .fc_table = RT6_TABLE_DFLT, | |
238fc7ea | 1837 | .fc_metric = IP6_RT_PRIO_USER, |
86872cb5 TG |
1838 | .fc_ifindex = dev->ifindex, |
1839 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | | |
1840 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), | |
5578689a DL |
1841 | .fc_nlinfo.pid = 0, |
1842 | .fc_nlinfo.nlh = NULL, | |
c346dca1 | 1843 | .fc_nlinfo.nl_net = dev_net(dev), |
86872cb5 | 1844 | }; |
1da177e4 | 1845 | |
86872cb5 | 1846 | ipv6_addr_copy(&cfg.fc_gateway, gwaddr); |
1da177e4 | 1847 | |
86872cb5 | 1848 | ip6_route_add(&cfg); |
1da177e4 | 1849 | |
1da177e4 LT |
1850 | return rt6_get_dflt_router(gwaddr, dev); |
1851 | } | |
1852 | ||
7b4da532 | 1853 | void rt6_purge_dflt_routers(struct net *net) |
1da177e4 LT |
1854 | { |
1855 | struct rt6_info *rt; | |
c71099ac TG |
1856 | struct fib6_table *table; |
1857 | ||
1858 | /* NOTE: Keep consistent with rt6_get_dflt_router */ | |
7b4da532 | 1859 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
c71099ac TG |
1860 | if (table == NULL) |
1861 | return; | |
1da177e4 LT |
1862 | |
1863 | restart: | |
c71099ac | 1864 | read_lock_bh(&table->tb6_lock); |
d8d1f30b | 1865 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 | 1866 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
d8d1f30b | 1867 | dst_hold(&rt->dst); |
c71099ac | 1868 | read_unlock_bh(&table->tb6_lock); |
e0a1ad73 | 1869 | ip6_del_rt(rt); |
1da177e4 LT |
1870 | goto restart; |
1871 | } | |
1872 | } | |
c71099ac | 1873 | read_unlock_bh(&table->tb6_lock); |
1da177e4 LT |
1874 | } |
1875 | ||
5578689a DL |
1876 | static void rtmsg_to_fib6_config(struct net *net, |
1877 | struct in6_rtmsg *rtmsg, | |
86872cb5 TG |
1878 | struct fib6_config *cfg) |
1879 | { | |
1880 | memset(cfg, 0, sizeof(*cfg)); | |
1881 | ||
1882 | cfg->fc_table = RT6_TABLE_MAIN; | |
1883 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; | |
1884 | cfg->fc_metric = rtmsg->rtmsg_metric; | |
1885 | cfg->fc_expires = rtmsg->rtmsg_info; | |
1886 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; | |
1887 | cfg->fc_src_len = rtmsg->rtmsg_src_len; | |
1888 | cfg->fc_flags = rtmsg->rtmsg_flags; | |
1889 | ||
5578689a | 1890 | cfg->fc_nlinfo.nl_net = net; |
f1243c2d | 1891 | |
86872cb5 TG |
1892 | ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst); |
1893 | ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src); | |
1894 | ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway); | |
1895 | } | |
1896 | ||
5578689a | 1897 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 | 1898 | { |
86872cb5 | 1899 | struct fib6_config cfg; |
1da177e4 LT |
1900 | struct in6_rtmsg rtmsg; |
1901 | int err; | |
1902 | ||
1903 | switch(cmd) { | |
1904 | case SIOCADDRT: /* Add a route */ | |
1905 | case SIOCDELRT: /* Delete a route */ | |
1906 | if (!capable(CAP_NET_ADMIN)) | |
1907 | return -EPERM; | |
1908 | err = copy_from_user(&rtmsg, arg, | |
1909 | sizeof(struct in6_rtmsg)); | |
1910 | if (err) | |
1911 | return -EFAULT; | |
86872cb5 | 1912 | |
5578689a | 1913 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
86872cb5 | 1914 | |
1da177e4 LT |
1915 | rtnl_lock(); |
1916 | switch (cmd) { | |
1917 | case SIOCADDRT: | |
86872cb5 | 1918 | err = ip6_route_add(&cfg); |
1da177e4 LT |
1919 | break; |
1920 | case SIOCDELRT: | |
86872cb5 | 1921 | err = ip6_route_del(&cfg); |
1da177e4 LT |
1922 | break; |
1923 | default: | |
1924 | err = -EINVAL; | |
1925 | } | |
1926 | rtnl_unlock(); | |
1927 | ||
1928 | return err; | |
3ff50b79 | 1929 | } |
1da177e4 LT |
1930 | |
1931 | return -EINVAL; | |
1932 | } | |
1933 | ||
1934 | /* | |
1935 | * Drop the packet on the floor | |
1936 | */ | |
1937 | ||
d5fdd6ba | 1938 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
1da177e4 | 1939 | { |
612f09e8 | 1940 | int type; |
adf30907 | 1941 | struct dst_entry *dst = skb_dst(skb); |
612f09e8 YH |
1942 | switch (ipstats_mib_noroutes) { |
1943 | case IPSTATS_MIB_INNOROUTES: | |
0660e03f | 1944 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
45bb0060 | 1945 | if (type == IPV6_ADDR_ANY) { |
3bd653c8 DL |
1946 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1947 | IPSTATS_MIB_INADDRERRORS); | |
612f09e8 YH |
1948 | break; |
1949 | } | |
1950 | /* FALLTHROUGH */ | |
1951 | case IPSTATS_MIB_OUTNOROUTES: | |
3bd653c8 DL |
1952 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
1953 | ipstats_mib_noroutes); | |
612f09e8 YH |
1954 | break; |
1955 | } | |
3ffe533c | 1956 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
1da177e4 LT |
1957 | kfree_skb(skb); |
1958 | return 0; | |
1959 | } | |
1960 | ||
9ce8ade0 TG |
1961 | static int ip6_pkt_discard(struct sk_buff *skb) |
1962 | { | |
612f09e8 | 1963 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1964 | } |
1965 | ||
20380731 | 1966 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
1da177e4 | 1967 | { |
adf30907 | 1968 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1969 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
1da177e4 LT |
1970 | } |
1971 | ||
6723ab54 DM |
1972 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
1973 | ||
9ce8ade0 TG |
1974 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
1975 | { | |
612f09e8 | 1976 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
9ce8ade0 TG |
1977 | } |
1978 | ||
1979 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) | |
1980 | { | |
adf30907 | 1981 | skb->dev = skb_dst(skb)->dev; |
612f09e8 | 1982 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
9ce8ade0 TG |
1983 | } |
1984 | ||
6723ab54 DM |
1985 | #endif |
1986 | ||
1da177e4 LT |
1987 | /* |
1988 | * Allocate a dst for local (unicast / anycast) address. | |
1989 | */ | |
1990 | ||
1991 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, | |
1992 | const struct in6_addr *addr, | |
1993 | int anycast) | |
1994 | { | |
c346dca1 | 1995 | struct net *net = dev_net(idev->dev); |
86393e52 | 1996 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops); |
14deae41 | 1997 | struct neighbour *neigh; |
1da177e4 | 1998 | |
40385653 BG |
1999 | if (rt == NULL) { |
2000 | if (net_ratelimit()) | |
2001 | pr_warning("IPv6: Maximum number of routes reached," | |
2002 | " consider increasing route/max_size.\n"); | |
1da177e4 | 2003 | return ERR_PTR(-ENOMEM); |
40385653 | 2004 | } |
1da177e4 | 2005 | |
5578689a | 2006 | dev_hold(net->loopback_dev); |
1da177e4 LT |
2007 | in6_dev_hold(idev); |
2008 | ||
d8d1f30b CG |
2009 | rt->dst.flags = DST_HOST; |
2010 | rt->dst.input = ip6_input; | |
2011 | rt->dst.output = ip6_output; | |
5578689a | 2012 | rt->rt6i_dev = net->loopback_dev; |
1da177e4 | 2013 | rt->rt6i_idev = idev; |
defb3519 | 2014 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, -1); |
d8d1f30b | 2015 | rt->dst.obsolete = -1; |
1da177e4 LT |
2016 | |
2017 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; | |
58c4fb86 YH |
2018 | if (anycast) |
2019 | rt->rt6i_flags |= RTF_ANYCAST; | |
2020 | else | |
1da177e4 | 2021 | rt->rt6i_flags |= RTF_LOCAL; |
14deae41 DM |
2022 | neigh = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
2023 | if (IS_ERR(neigh)) { | |
d8d1f30b | 2024 | dst_free(&rt->dst); |
14deae41 DM |
2025 | |
2026 | /* We are casting this because that is the return | |
2027 | * value type. But an errno encoded pointer is the | |
2028 | * same regardless of the underlying pointer type, | |
2029 | * and that's what we are returning. So this is OK. | |
2030 | */ | |
2031 | return (struct rt6_info *) neigh; | |
1da177e4 | 2032 | } |
14deae41 | 2033 | rt->rt6i_nexthop = neigh; |
1da177e4 LT |
2034 | |
2035 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); | |
2036 | rt->rt6i_dst.plen = 128; | |
5578689a | 2037 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
1da177e4 | 2038 | |
d8d1f30b | 2039 | atomic_set(&rt->dst.__refcnt, 1); |
1da177e4 LT |
2040 | |
2041 | return rt; | |
2042 | } | |
2043 | ||
8ed67789 DL |
2044 | struct arg_dev_net { |
2045 | struct net_device *dev; | |
2046 | struct net *net; | |
2047 | }; | |
2048 | ||
1da177e4 LT |
2049 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
2050 | { | |
bc3ef660 | 2051 | const struct arg_dev_net *adn = arg; |
2052 | const struct net_device *dev = adn->dev; | |
8ed67789 | 2053 | |
bc3ef660 | 2054 | if ((rt->rt6i_dev == dev || dev == NULL) && |
2055 | rt != adn->net->ipv6.ip6_null_entry) { | |
1da177e4 LT |
2056 | RT6_TRACE("deleted by ifdown %p\n", rt); |
2057 | return -1; | |
2058 | } | |
2059 | return 0; | |
2060 | } | |
2061 | ||
f3db4851 | 2062 | void rt6_ifdown(struct net *net, struct net_device *dev) |
1da177e4 | 2063 | { |
8ed67789 DL |
2064 | struct arg_dev_net adn = { |
2065 | .dev = dev, | |
2066 | .net = net, | |
2067 | }; | |
2068 | ||
2069 | fib6_clean_all(net, fib6_ifdown, 0, &adn); | |
1e493d19 | 2070 | icmp6_clean_all(fib6_ifdown, &adn); |
1da177e4 LT |
2071 | } |
2072 | ||
2073 | struct rt6_mtu_change_arg | |
2074 | { | |
2075 | struct net_device *dev; | |
2076 | unsigned mtu; | |
2077 | }; | |
2078 | ||
2079 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) | |
2080 | { | |
2081 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; | |
2082 | struct inet6_dev *idev; | |
2083 | ||
2084 | /* In IPv6 pmtu discovery is not optional, | |
2085 | so that RTAX_MTU lock cannot disable it. | |
2086 | We still use this lock to block changes | |
2087 | caused by addrconf/ndisc. | |
2088 | */ | |
2089 | ||
2090 | idev = __in6_dev_get(arg->dev); | |
2091 | if (idev == NULL) | |
2092 | return 0; | |
2093 | ||
2094 | /* For administrative MTU increase, there is no way to discover | |
2095 | IPv6 PMTU increase, so PMTU increase should be updated here. | |
2096 | Since RFC 1981 doesn't include administrative MTU increase | |
2097 | update PMTU increase is a MUST. (i.e. jumbo frame) | |
2098 | */ | |
2099 | /* | |
2100 | If new MTU is less than route PMTU, this new MTU will be the | |
2101 | lowest MTU in the path, update the route PMTU to reflect PMTU | |
2102 | decreases; if new MTU is greater than route PMTU, and the | |
2103 | old MTU is the lowest MTU in the path, update the route PMTU | |
2104 | to reflect the increase. In this case if the other nodes' MTU | |
2105 | also have the lowest MTU, TOO BIG MESSAGE will be lead to | |
2106 | PMTU discouvery. | |
2107 | */ | |
2108 | if (rt->rt6i_dev == arg->dev && | |
d8d1f30b CG |
2109 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
2110 | (dst_mtu(&rt->dst) >= arg->mtu || | |
2111 | (dst_mtu(&rt->dst) < arg->mtu && | |
2112 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { | |
defb3519 | 2113 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
566cfd8f | 2114 | } |
1da177e4 LT |
2115 | return 0; |
2116 | } | |
2117 | ||
2118 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) | |
2119 | { | |
c71099ac TG |
2120 | struct rt6_mtu_change_arg arg = { |
2121 | .dev = dev, | |
2122 | .mtu = mtu, | |
2123 | }; | |
1da177e4 | 2124 | |
c346dca1 | 2125 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
1da177e4 LT |
2126 | } |
2127 | ||
ef7c79ed | 2128 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
5176f91e | 2129 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
86872cb5 | 2130 | [RTA_OIF] = { .type = NLA_U32 }, |
ab364a6f | 2131 | [RTA_IIF] = { .type = NLA_U32 }, |
86872cb5 TG |
2132 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
2133 | [RTA_METRICS] = { .type = NLA_NESTED }, | |
2134 | }; | |
2135 | ||
2136 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, | |
2137 | struct fib6_config *cfg) | |
1da177e4 | 2138 | { |
86872cb5 TG |
2139 | struct rtmsg *rtm; |
2140 | struct nlattr *tb[RTA_MAX+1]; | |
2141 | int err; | |
1da177e4 | 2142 | |
86872cb5 TG |
2143 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2144 | if (err < 0) | |
2145 | goto errout; | |
1da177e4 | 2146 | |
86872cb5 TG |
2147 | err = -EINVAL; |
2148 | rtm = nlmsg_data(nlh); | |
2149 | memset(cfg, 0, sizeof(*cfg)); | |
2150 | ||
2151 | cfg->fc_table = rtm->rtm_table; | |
2152 | cfg->fc_dst_len = rtm->rtm_dst_len; | |
2153 | cfg->fc_src_len = rtm->rtm_src_len; | |
2154 | cfg->fc_flags = RTF_UP; | |
2155 | cfg->fc_protocol = rtm->rtm_protocol; | |
2156 | ||
2157 | if (rtm->rtm_type == RTN_UNREACHABLE) | |
2158 | cfg->fc_flags |= RTF_REJECT; | |
2159 | ||
ab79ad14 MŻ |
2160 | if (rtm->rtm_type == RTN_LOCAL) |
2161 | cfg->fc_flags |= RTF_LOCAL; | |
2162 | ||
86872cb5 TG |
2163 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
2164 | cfg->fc_nlinfo.nlh = nlh; | |
3b1e0a65 | 2165 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
86872cb5 TG |
2166 | |
2167 | if (tb[RTA_GATEWAY]) { | |
2168 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); | |
2169 | cfg->fc_flags |= RTF_GATEWAY; | |
1da177e4 | 2170 | } |
86872cb5 TG |
2171 | |
2172 | if (tb[RTA_DST]) { | |
2173 | int plen = (rtm->rtm_dst_len + 7) >> 3; | |
2174 | ||
2175 | if (nla_len(tb[RTA_DST]) < plen) | |
2176 | goto errout; | |
2177 | ||
2178 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); | |
1da177e4 | 2179 | } |
86872cb5 TG |
2180 | |
2181 | if (tb[RTA_SRC]) { | |
2182 | int plen = (rtm->rtm_src_len + 7) >> 3; | |
2183 | ||
2184 | if (nla_len(tb[RTA_SRC]) < plen) | |
2185 | goto errout; | |
2186 | ||
2187 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); | |
1da177e4 | 2188 | } |
86872cb5 TG |
2189 | |
2190 | if (tb[RTA_OIF]) | |
2191 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); | |
2192 | ||
2193 | if (tb[RTA_PRIORITY]) | |
2194 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); | |
2195 | ||
2196 | if (tb[RTA_METRICS]) { | |
2197 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); | |
2198 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); | |
1da177e4 | 2199 | } |
86872cb5 TG |
2200 | |
2201 | if (tb[RTA_TABLE]) | |
2202 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); | |
2203 | ||
2204 | err = 0; | |
2205 | errout: | |
2206 | return err; | |
1da177e4 LT |
2207 | } |
2208 | ||
c127ea2c | 2209 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2210 | { |
86872cb5 TG |
2211 | struct fib6_config cfg; |
2212 | int err; | |
1da177e4 | 2213 | |
86872cb5 TG |
2214 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2215 | if (err < 0) | |
2216 | return err; | |
2217 | ||
2218 | return ip6_route_del(&cfg); | |
1da177e4 LT |
2219 | } |
2220 | ||
c127ea2c | 2221 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2222 | { |
86872cb5 TG |
2223 | struct fib6_config cfg; |
2224 | int err; | |
1da177e4 | 2225 | |
86872cb5 TG |
2226 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
2227 | if (err < 0) | |
2228 | return err; | |
2229 | ||
2230 | return ip6_route_add(&cfg); | |
1da177e4 LT |
2231 | } |
2232 | ||
339bf98f TG |
2233 | static inline size_t rt6_nlmsg_size(void) |
2234 | { | |
2235 | return NLMSG_ALIGN(sizeof(struct rtmsg)) | |
2236 | + nla_total_size(16) /* RTA_SRC */ | |
2237 | + nla_total_size(16) /* RTA_DST */ | |
2238 | + nla_total_size(16) /* RTA_GATEWAY */ | |
2239 | + nla_total_size(16) /* RTA_PREFSRC */ | |
2240 | + nla_total_size(4) /* RTA_TABLE */ | |
2241 | + nla_total_size(4) /* RTA_IIF */ | |
2242 | + nla_total_size(4) /* RTA_OIF */ | |
2243 | + nla_total_size(4) /* RTA_PRIORITY */ | |
6a2b9ce0 | 2244 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
339bf98f TG |
2245 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
2246 | } | |
2247 | ||
191cd582 BH |
2248 | static int rt6_fill_node(struct net *net, |
2249 | struct sk_buff *skb, struct rt6_info *rt, | |
0d51aa80 JHS |
2250 | struct in6_addr *dst, struct in6_addr *src, |
2251 | int iif, int type, u32 pid, u32 seq, | |
7bc570c8 | 2252 | int prefix, int nowait, unsigned int flags) |
1da177e4 LT |
2253 | { |
2254 | struct rtmsg *rtm; | |
2d7202bf | 2255 | struct nlmsghdr *nlh; |
e3703b3d | 2256 | long expires; |
9e762a4a | 2257 | u32 table; |
1da177e4 LT |
2258 | |
2259 | if (prefix) { /* user wants prefix routes only */ | |
2260 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { | |
2261 | /* success since this is not a prefix route */ | |
2262 | return 1; | |
2263 | } | |
2264 | } | |
2265 | ||
2d7202bf TG |
2266 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
2267 | if (nlh == NULL) | |
26932566 | 2268 | return -EMSGSIZE; |
2d7202bf TG |
2269 | |
2270 | rtm = nlmsg_data(nlh); | |
1da177e4 LT |
2271 | rtm->rtm_family = AF_INET6; |
2272 | rtm->rtm_dst_len = rt->rt6i_dst.plen; | |
2273 | rtm->rtm_src_len = rt->rt6i_src.plen; | |
2274 | rtm->rtm_tos = 0; | |
c71099ac | 2275 | if (rt->rt6i_table) |
9e762a4a | 2276 | table = rt->rt6i_table->tb6_id; |
c71099ac | 2277 | else |
9e762a4a PM |
2278 | table = RT6_TABLE_UNSPEC; |
2279 | rtm->rtm_table = table; | |
2d7202bf | 2280 | NLA_PUT_U32(skb, RTA_TABLE, table); |
1da177e4 LT |
2281 | if (rt->rt6i_flags&RTF_REJECT) |
2282 | rtm->rtm_type = RTN_UNREACHABLE; | |
ab79ad14 MŻ |
2283 | else if (rt->rt6i_flags&RTF_LOCAL) |
2284 | rtm->rtm_type = RTN_LOCAL; | |
1da177e4 LT |
2285 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) |
2286 | rtm->rtm_type = RTN_LOCAL; | |
2287 | else | |
2288 | rtm->rtm_type = RTN_UNICAST; | |
2289 | rtm->rtm_flags = 0; | |
2290 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; | |
2291 | rtm->rtm_protocol = rt->rt6i_protocol; | |
2292 | if (rt->rt6i_flags&RTF_DYNAMIC) | |
2293 | rtm->rtm_protocol = RTPROT_REDIRECT; | |
2294 | else if (rt->rt6i_flags & RTF_ADDRCONF) | |
2295 | rtm->rtm_protocol = RTPROT_KERNEL; | |
2296 | else if (rt->rt6i_flags&RTF_DEFAULT) | |
2297 | rtm->rtm_protocol = RTPROT_RA; | |
2298 | ||
2299 | if (rt->rt6i_flags&RTF_CACHE) | |
2300 | rtm->rtm_flags |= RTM_F_CLONED; | |
2301 | ||
2302 | if (dst) { | |
2d7202bf | 2303 | NLA_PUT(skb, RTA_DST, 16, dst); |
1ab1457c | 2304 | rtm->rtm_dst_len = 128; |
1da177e4 | 2305 | } else if (rtm->rtm_dst_len) |
2d7202bf | 2306 | NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
1da177e4 LT |
2307 | #ifdef CONFIG_IPV6_SUBTREES |
2308 | if (src) { | |
2d7202bf | 2309 | NLA_PUT(skb, RTA_SRC, 16, src); |
1ab1457c | 2310 | rtm->rtm_src_len = 128; |
1da177e4 | 2311 | } else if (rtm->rtm_src_len) |
2d7202bf | 2312 | NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
1da177e4 | 2313 | #endif |
7bc570c8 YH |
2314 | if (iif) { |
2315 | #ifdef CONFIG_IPV6_MROUTE | |
2316 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { | |
8229efda | 2317 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
7bc570c8 YH |
2318 | if (err <= 0) { |
2319 | if (!nowait) { | |
2320 | if (err == 0) | |
2321 | return 0; | |
2322 | goto nla_put_failure; | |
2323 | } else { | |
2324 | if (err == -EMSGSIZE) | |
2325 | goto nla_put_failure; | |
2326 | } | |
2327 | } | |
2328 | } else | |
2329 | #endif | |
2330 | NLA_PUT_U32(skb, RTA_IIF, iif); | |
2331 | } else if (dst) { | |
d8d1f30b | 2332 | struct inet6_dev *idev = ip6_dst_idev(&rt->dst); |
1da177e4 | 2333 | struct in6_addr saddr_buf; |
191cd582 | 2334 | if (ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
7cbca67c | 2335 | dst, 0, &saddr_buf) == 0) |
2d7202bf | 2336 | NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
1da177e4 | 2337 | } |
2d7202bf | 2338 | |
defb3519 | 2339 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
2d7202bf TG |
2340 | goto nla_put_failure; |
2341 | ||
d8d1f30b CG |
2342 | if (rt->dst.neighbour) |
2343 | NLA_PUT(skb, RTA_GATEWAY, 16, &rt->dst.neighbour->primary_key); | |
2d7202bf | 2344 | |
d8d1f30b | 2345 | if (rt->dst.dev) |
2d7202bf TG |
2346 | NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex); |
2347 | ||
2348 | NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric); | |
e3703b3d | 2349 | |
36e3deae YH |
2350 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
2351 | expires = 0; | |
2352 | else if (rt->rt6i_expires - jiffies < INT_MAX) | |
2353 | expires = rt->rt6i_expires - jiffies; | |
2354 | else | |
2355 | expires = INT_MAX; | |
69cdf8f9 | 2356 | |
d8d1f30b CG |
2357 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0, |
2358 | expires, rt->dst.error) < 0) | |
e3703b3d | 2359 | goto nla_put_failure; |
2d7202bf TG |
2360 | |
2361 | return nlmsg_end(skb, nlh); | |
2362 | ||
2363 | nla_put_failure: | |
26932566 PM |
2364 | nlmsg_cancel(skb, nlh); |
2365 | return -EMSGSIZE; | |
1da177e4 LT |
2366 | } |
2367 | ||
1b43af54 | 2368 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
1da177e4 LT |
2369 | { |
2370 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; | |
2371 | int prefix; | |
2372 | ||
2d7202bf TG |
2373 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
2374 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); | |
1da177e4 LT |
2375 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
2376 | } else | |
2377 | prefix = 0; | |
2378 | ||
191cd582 BH |
2379 | return rt6_fill_node(arg->net, |
2380 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, | |
1da177e4 | 2381 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
7bc570c8 | 2382 | prefix, 0, NLM_F_MULTI); |
1da177e4 LT |
2383 | } |
2384 | ||
c127ea2c | 2385 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
1da177e4 | 2386 | { |
3b1e0a65 | 2387 | struct net *net = sock_net(in_skb->sk); |
ab364a6f TG |
2388 | struct nlattr *tb[RTA_MAX+1]; |
2389 | struct rt6_info *rt; | |
1da177e4 | 2390 | struct sk_buff *skb; |
ab364a6f | 2391 | struct rtmsg *rtm; |
1da177e4 | 2392 | struct flowi fl; |
ab364a6f | 2393 | int err, iif = 0; |
1da177e4 | 2394 | |
ab364a6f TG |
2395 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
2396 | if (err < 0) | |
2397 | goto errout; | |
1da177e4 | 2398 | |
ab364a6f | 2399 | err = -EINVAL; |
1da177e4 | 2400 | memset(&fl, 0, sizeof(fl)); |
1da177e4 | 2401 | |
ab364a6f TG |
2402 | if (tb[RTA_SRC]) { |
2403 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) | |
2404 | goto errout; | |
2405 | ||
2406 | ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC])); | |
2407 | } | |
2408 | ||
2409 | if (tb[RTA_DST]) { | |
2410 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) | |
2411 | goto errout; | |
2412 | ||
2413 | ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST])); | |
2414 | } | |
2415 | ||
2416 | if (tb[RTA_IIF]) | |
2417 | iif = nla_get_u32(tb[RTA_IIF]); | |
2418 | ||
2419 | if (tb[RTA_OIF]) | |
2420 | fl.oif = nla_get_u32(tb[RTA_OIF]); | |
1da177e4 LT |
2421 | |
2422 | if (iif) { | |
2423 | struct net_device *dev; | |
5578689a | 2424 | dev = __dev_get_by_index(net, iif); |
1da177e4 LT |
2425 | if (!dev) { |
2426 | err = -ENODEV; | |
ab364a6f | 2427 | goto errout; |
1da177e4 LT |
2428 | } |
2429 | } | |
2430 | ||
ab364a6f TG |
2431 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
2432 | if (skb == NULL) { | |
2433 | err = -ENOBUFS; | |
2434 | goto errout; | |
2435 | } | |
1da177e4 | 2436 | |
ab364a6f TG |
2437 | /* Reserve room for dummy headers, this skb can pass |
2438 | through good chunk of routing engine. | |
2439 | */ | |
459a98ed | 2440 | skb_reset_mac_header(skb); |
ab364a6f | 2441 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
1da177e4 | 2442 | |
8a3edd80 | 2443 | rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl); |
d8d1f30b | 2444 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 2445 | |
191cd582 | 2446 | err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif, |
1da177e4 | 2447 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
7bc570c8 | 2448 | nlh->nlmsg_seq, 0, 0, 0); |
1da177e4 | 2449 | if (err < 0) { |
ab364a6f TG |
2450 | kfree_skb(skb); |
2451 | goto errout; | |
1da177e4 LT |
2452 | } |
2453 | ||
5578689a | 2454 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
ab364a6f | 2455 | errout: |
1da177e4 | 2456 | return err; |
1da177e4 LT |
2457 | } |
2458 | ||
86872cb5 | 2459 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
1da177e4 LT |
2460 | { |
2461 | struct sk_buff *skb; | |
5578689a | 2462 | struct net *net = info->nl_net; |
528c4ceb DL |
2463 | u32 seq; |
2464 | int err; | |
2465 | ||
2466 | err = -ENOBUFS; | |
2467 | seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0; | |
86872cb5 | 2468 | |
339bf98f | 2469 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
21713ebc TG |
2470 | if (skb == NULL) |
2471 | goto errout; | |
2472 | ||
191cd582 | 2473 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
7bc570c8 | 2474 | event, info->pid, seq, 0, 0, 0); |
26932566 PM |
2475 | if (err < 0) { |
2476 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ | |
2477 | WARN_ON(err == -EMSGSIZE); | |
2478 | kfree_skb(skb); | |
2479 | goto errout; | |
2480 | } | |
1ce85fe4 PNA |
2481 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
2482 | info->nlh, gfp_any()); | |
2483 | return; | |
21713ebc TG |
2484 | errout: |
2485 | if (err < 0) | |
5578689a | 2486 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
1da177e4 LT |
2487 | } |
2488 | ||
8ed67789 DL |
2489 | static int ip6_route_dev_notify(struct notifier_block *this, |
2490 | unsigned long event, void *data) | |
2491 | { | |
2492 | struct net_device *dev = (struct net_device *)data; | |
c346dca1 | 2493 | struct net *net = dev_net(dev); |
8ed67789 DL |
2494 | |
2495 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { | |
d8d1f30b | 2496 | net->ipv6.ip6_null_entry->dst.dev = dev; |
8ed67789 DL |
2497 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
2498 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2499 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
8ed67789 | 2500 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
d8d1f30b | 2501 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
8ed67789 DL |
2502 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
2503 | #endif | |
2504 | } | |
2505 | ||
2506 | return NOTIFY_OK; | |
2507 | } | |
2508 | ||
1da177e4 LT |
2509 | /* |
2510 | * /proc | |
2511 | */ | |
2512 | ||
2513 | #ifdef CONFIG_PROC_FS | |
2514 | ||
1da177e4 LT |
2515 | struct rt6_proc_arg |
2516 | { | |
2517 | char *buffer; | |
2518 | int offset; | |
2519 | int length; | |
2520 | int skip; | |
2521 | int len; | |
2522 | }; | |
2523 | ||
2524 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) | |
2525 | { | |
33120b30 | 2526 | struct seq_file *m = p_arg; |
1da177e4 | 2527 | |
4b7a4274 | 2528 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
1da177e4 LT |
2529 | |
2530 | #ifdef CONFIG_IPV6_SUBTREES | |
4b7a4274 | 2531 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
1da177e4 | 2532 | #else |
33120b30 | 2533 | seq_puts(m, "00000000000000000000000000000000 00 "); |
1da177e4 LT |
2534 | #endif |
2535 | ||
2536 | if (rt->rt6i_nexthop) { | |
4b7a4274 | 2537 | seq_printf(m, "%pi6", rt->rt6i_nexthop->primary_key); |
1da177e4 | 2538 | } else { |
33120b30 | 2539 | seq_puts(m, "00000000000000000000000000000000"); |
1da177e4 | 2540 | } |
33120b30 | 2541 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
d8d1f30b CG |
2542 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
2543 | rt->dst.__use, rt->rt6i_flags, | |
33120b30 | 2544 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
1da177e4 LT |
2545 | return 0; |
2546 | } | |
2547 | ||
33120b30 | 2548 | static int ipv6_route_show(struct seq_file *m, void *v) |
1da177e4 | 2549 | { |
f3db4851 DL |
2550 | struct net *net = (struct net *)m->private; |
2551 | fib6_clean_all(net, rt6_info_route, 0, m); | |
33120b30 AD |
2552 | return 0; |
2553 | } | |
1da177e4 | 2554 | |
33120b30 AD |
2555 | static int ipv6_route_open(struct inode *inode, struct file *file) |
2556 | { | |
de05c557 | 2557 | return single_open_net(inode, file, ipv6_route_show); |
f3db4851 DL |
2558 | } |
2559 | ||
33120b30 AD |
2560 | static const struct file_operations ipv6_route_proc_fops = { |
2561 | .owner = THIS_MODULE, | |
2562 | .open = ipv6_route_open, | |
2563 | .read = seq_read, | |
2564 | .llseek = seq_lseek, | |
b6fcbdb4 | 2565 | .release = single_release_net, |
33120b30 AD |
2566 | }; |
2567 | ||
1da177e4 LT |
2568 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
2569 | { | |
69ddb805 | 2570 | struct net *net = (struct net *)seq->private; |
1da177e4 | 2571 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
69ddb805 DL |
2572 | net->ipv6.rt6_stats->fib_nodes, |
2573 | net->ipv6.rt6_stats->fib_route_nodes, | |
2574 | net->ipv6.rt6_stats->fib_rt_alloc, | |
2575 | net->ipv6.rt6_stats->fib_rt_entries, | |
2576 | net->ipv6.rt6_stats->fib_rt_cache, | |
fc66f95c | 2577 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
69ddb805 | 2578 | net->ipv6.rt6_stats->fib_discarded_routes); |
1da177e4 LT |
2579 | |
2580 | return 0; | |
2581 | } | |
2582 | ||
2583 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) | |
2584 | { | |
de05c557 | 2585 | return single_open_net(inode, file, rt6_stats_seq_show); |
69ddb805 DL |
2586 | } |
2587 | ||
9a32144e | 2588 | static const struct file_operations rt6_stats_seq_fops = { |
1da177e4 LT |
2589 | .owner = THIS_MODULE, |
2590 | .open = rt6_stats_seq_open, | |
2591 | .read = seq_read, | |
2592 | .llseek = seq_lseek, | |
b6fcbdb4 | 2593 | .release = single_release_net, |
1da177e4 LT |
2594 | }; |
2595 | #endif /* CONFIG_PROC_FS */ | |
2596 | ||
2597 | #ifdef CONFIG_SYSCTL | |
2598 | ||
1da177e4 | 2599 | static |
8d65af78 | 2600 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
1da177e4 LT |
2601 | void __user *buffer, size_t *lenp, loff_t *ppos) |
2602 | { | |
5b7c931d DL |
2603 | struct net *net = current->nsproxy->net_ns; |
2604 | int delay = net->ipv6.sysctl.flush_delay; | |
1da177e4 | 2605 | if (write) { |
8d65af78 | 2606 | proc_dointvec(ctl, write, buffer, lenp, ppos); |
5b7c931d | 2607 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
1da177e4 LT |
2608 | return 0; |
2609 | } else | |
2610 | return -EINVAL; | |
2611 | } | |
2612 | ||
760f2d01 | 2613 | ctl_table ipv6_route_table_template[] = { |
1ab1457c | 2614 | { |
1da177e4 | 2615 | .procname = "flush", |
4990509f | 2616 | .data = &init_net.ipv6.sysctl.flush_delay, |
1da177e4 | 2617 | .maxlen = sizeof(int), |
89c8b3a1 | 2618 | .mode = 0200, |
6d9f239a | 2619 | .proc_handler = ipv6_sysctl_rtcache_flush |
1da177e4 LT |
2620 | }, |
2621 | { | |
1da177e4 | 2622 | .procname = "gc_thresh", |
9a7ec3a9 | 2623 | .data = &ip6_dst_ops_template.gc_thresh, |
1da177e4 LT |
2624 | .maxlen = sizeof(int), |
2625 | .mode = 0644, | |
6d9f239a | 2626 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2627 | }, |
2628 | { | |
1da177e4 | 2629 | .procname = "max_size", |
4990509f | 2630 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
1da177e4 LT |
2631 | .maxlen = sizeof(int), |
2632 | .mode = 0644, | |
6d9f239a | 2633 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2634 | }, |
2635 | { | |
1da177e4 | 2636 | .procname = "gc_min_interval", |
4990509f | 2637 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2638 | .maxlen = sizeof(int), |
2639 | .mode = 0644, | |
6d9f239a | 2640 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2641 | }, |
2642 | { | |
1da177e4 | 2643 | .procname = "gc_timeout", |
4990509f | 2644 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
1da177e4 LT |
2645 | .maxlen = sizeof(int), |
2646 | .mode = 0644, | |
6d9f239a | 2647 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2648 | }, |
2649 | { | |
1da177e4 | 2650 | .procname = "gc_interval", |
4990509f | 2651 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
1da177e4 LT |
2652 | .maxlen = sizeof(int), |
2653 | .mode = 0644, | |
6d9f239a | 2654 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2655 | }, |
2656 | { | |
1da177e4 | 2657 | .procname = "gc_elasticity", |
4990509f | 2658 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
1da177e4 LT |
2659 | .maxlen = sizeof(int), |
2660 | .mode = 0644, | |
f3d3f616 | 2661 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2662 | }, |
2663 | { | |
1da177e4 | 2664 | .procname = "mtu_expires", |
4990509f | 2665 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
1da177e4 LT |
2666 | .maxlen = sizeof(int), |
2667 | .mode = 0644, | |
6d9f239a | 2668 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2669 | }, |
2670 | { | |
1da177e4 | 2671 | .procname = "min_adv_mss", |
4990509f | 2672 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
1da177e4 LT |
2673 | .maxlen = sizeof(int), |
2674 | .mode = 0644, | |
f3d3f616 | 2675 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2676 | }, |
2677 | { | |
1da177e4 | 2678 | .procname = "gc_min_interval_ms", |
4990509f | 2679 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
1da177e4 LT |
2680 | .maxlen = sizeof(int), |
2681 | .mode = 0644, | |
6d9f239a | 2682 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 | 2683 | }, |
f8572d8f | 2684 | { } |
1da177e4 LT |
2685 | }; |
2686 | ||
2c8c1e72 | 2687 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
760f2d01 DL |
2688 | { |
2689 | struct ctl_table *table; | |
2690 | ||
2691 | table = kmemdup(ipv6_route_table_template, | |
2692 | sizeof(ipv6_route_table_template), | |
2693 | GFP_KERNEL); | |
5ee09105 YH |
2694 | |
2695 | if (table) { | |
2696 | table[0].data = &net->ipv6.sysctl.flush_delay; | |
86393e52 | 2697 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
5ee09105 YH |
2698 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
2699 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; | |
2700 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; | |
2701 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; | |
2702 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; | |
2703 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; | |
2704 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; | |
9c69fabe | 2705 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
5ee09105 YH |
2706 | } |
2707 | ||
760f2d01 DL |
2708 | return table; |
2709 | } | |
1da177e4 LT |
2710 | #endif |
2711 | ||
2c8c1e72 | 2712 | static int __net_init ip6_route_net_init(struct net *net) |
cdb18761 | 2713 | { |
633d424b | 2714 | int ret = -ENOMEM; |
8ed67789 | 2715 | |
86393e52 AD |
2716 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
2717 | sizeof(net->ipv6.ip6_dst_ops)); | |
f2fc6a54 | 2718 | |
fc66f95c ED |
2719 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
2720 | goto out_ip6_dst_ops; | |
2721 | ||
8ed67789 DL |
2722 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
2723 | sizeof(*net->ipv6.ip6_null_entry), | |
2724 | GFP_KERNEL); | |
2725 | if (!net->ipv6.ip6_null_entry) | |
fc66f95c | 2726 | goto out_ip6_dst_entries; |
d8d1f30b | 2727 | net->ipv6.ip6_null_entry->dst.path = |
8ed67789 | 2728 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
d8d1f30b | 2729 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2730 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
2731 | ip6_template_metrics, true); | |
8ed67789 DL |
2732 | |
2733 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2734 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, | |
2735 | sizeof(*net->ipv6.ip6_prohibit_entry), | |
2736 | GFP_KERNEL); | |
68fffc67 PZ |
2737 | if (!net->ipv6.ip6_prohibit_entry) |
2738 | goto out_ip6_null_entry; | |
d8d1f30b | 2739 | net->ipv6.ip6_prohibit_entry->dst.path = |
8ed67789 | 2740 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
d8d1f30b | 2741 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2742 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
2743 | ip6_template_metrics, true); | |
8ed67789 DL |
2744 | |
2745 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, | |
2746 | sizeof(*net->ipv6.ip6_blk_hole_entry), | |
2747 | GFP_KERNEL); | |
68fffc67 PZ |
2748 | if (!net->ipv6.ip6_blk_hole_entry) |
2749 | goto out_ip6_prohibit_entry; | |
d8d1f30b | 2750 | net->ipv6.ip6_blk_hole_entry->dst.path = |
8ed67789 | 2751 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
d8d1f30b | 2752 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
62fa8a84 DM |
2753 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
2754 | ip6_template_metrics, true); | |
8ed67789 DL |
2755 | #endif |
2756 | ||
b339a47c PZ |
2757 | net->ipv6.sysctl.flush_delay = 0; |
2758 | net->ipv6.sysctl.ip6_rt_max_size = 4096; | |
2759 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; | |
2760 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; | |
2761 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; | |
2762 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; | |
2763 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; | |
2764 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; | |
2765 | ||
cdb18761 DL |
2766 | #ifdef CONFIG_PROC_FS |
2767 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); | |
2768 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); | |
2769 | #endif | |
6891a346 BT |
2770 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
2771 | ||
8ed67789 DL |
2772 | ret = 0; |
2773 | out: | |
2774 | return ret; | |
f2fc6a54 | 2775 | |
68fffc67 PZ |
2776 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
2777 | out_ip6_prohibit_entry: | |
2778 | kfree(net->ipv6.ip6_prohibit_entry); | |
2779 | out_ip6_null_entry: | |
2780 | kfree(net->ipv6.ip6_null_entry); | |
2781 | #endif | |
fc66f95c ED |
2782 | out_ip6_dst_entries: |
2783 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); | |
f2fc6a54 | 2784 | out_ip6_dst_ops: |
f2fc6a54 | 2785 | goto out; |
cdb18761 DL |
2786 | } |
2787 | ||
2c8c1e72 | 2788 | static void __net_exit ip6_route_net_exit(struct net *net) |
cdb18761 DL |
2789 | { |
2790 | #ifdef CONFIG_PROC_FS | |
2791 | proc_net_remove(net, "ipv6_route"); | |
2792 | proc_net_remove(net, "rt6_stats"); | |
2793 | #endif | |
8ed67789 DL |
2794 | kfree(net->ipv6.ip6_null_entry); |
2795 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
2796 | kfree(net->ipv6.ip6_prohibit_entry); | |
2797 | kfree(net->ipv6.ip6_blk_hole_entry); | |
2798 | #endif | |
41bb78b4 | 2799 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
cdb18761 DL |
2800 | } |
2801 | ||
2802 | static struct pernet_operations ip6_route_net_ops = { | |
2803 | .init = ip6_route_net_init, | |
2804 | .exit = ip6_route_net_exit, | |
2805 | }; | |
2806 | ||
8ed67789 DL |
2807 | static struct notifier_block ip6_route_dev_notifier = { |
2808 | .notifier_call = ip6_route_dev_notify, | |
2809 | .priority = 0, | |
2810 | }; | |
2811 | ||
433d49c3 | 2812 | int __init ip6_route_init(void) |
1da177e4 | 2813 | { |
433d49c3 DL |
2814 | int ret; |
2815 | ||
9a7ec3a9 DL |
2816 | ret = -ENOMEM; |
2817 | ip6_dst_ops_template.kmem_cachep = | |
e5d679f3 | 2818 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
f845ab6b | 2819 | SLAB_HWCACHE_ALIGN, NULL); |
9a7ec3a9 | 2820 | if (!ip6_dst_ops_template.kmem_cachep) |
c19a28e1 | 2821 | goto out; |
14e50e57 | 2822 | |
fc66f95c | 2823 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
8ed67789 | 2824 | if (ret) |
bdb3289f | 2825 | goto out_kmem_cache; |
bdb3289f | 2826 | |
fc66f95c ED |
2827 | ret = register_pernet_subsys(&ip6_route_net_ops); |
2828 | if (ret) | |
2829 | goto out_dst_entries; | |
2830 | ||
5dc121e9 AE |
2831 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
2832 | ||
8ed67789 DL |
2833 | /* Registering of the loopback is done before this portion of code, |
2834 | * the loopback reference in rt6_info will not be taken, do it | |
2835 | * manually for init_net */ | |
d8d1f30b | 2836 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2837 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2838 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
d8d1f30b | 2839 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
8ed67789 | 2840 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
d8d1f30b | 2841 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
8ed67789 DL |
2842 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
2843 | #endif | |
433d49c3 DL |
2844 | ret = fib6_init(); |
2845 | if (ret) | |
8ed67789 | 2846 | goto out_register_subsys; |
433d49c3 | 2847 | |
433d49c3 DL |
2848 | ret = xfrm6_init(); |
2849 | if (ret) | |
cdb18761 | 2850 | goto out_fib6_init; |
c35b7e72 | 2851 | |
433d49c3 DL |
2852 | ret = fib6_rules_init(); |
2853 | if (ret) | |
2854 | goto xfrm6_init; | |
7e5449c2 | 2855 | |
433d49c3 DL |
2856 | ret = -ENOBUFS; |
2857 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) || | |
2858 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) || | |
2859 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL)) | |
2860 | goto fib6_rules_init; | |
c127ea2c | 2861 | |
8ed67789 | 2862 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
cdb18761 DL |
2863 | if (ret) |
2864 | goto fib6_rules_init; | |
8ed67789 | 2865 | |
433d49c3 DL |
2866 | out: |
2867 | return ret; | |
2868 | ||
2869 | fib6_rules_init: | |
433d49c3 DL |
2870 | fib6_rules_cleanup(); |
2871 | xfrm6_init: | |
433d49c3 | 2872 | xfrm6_fini(); |
433d49c3 | 2873 | out_fib6_init: |
433d49c3 | 2874 | fib6_gc_cleanup(); |
8ed67789 DL |
2875 | out_register_subsys: |
2876 | unregister_pernet_subsys(&ip6_route_net_ops); | |
fc66f95c ED |
2877 | out_dst_entries: |
2878 | dst_entries_destroy(&ip6_dst_blackhole_ops); | |
433d49c3 | 2879 | out_kmem_cache: |
f2fc6a54 | 2880 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
433d49c3 | 2881 | goto out; |
1da177e4 LT |
2882 | } |
2883 | ||
2884 | void ip6_route_cleanup(void) | |
2885 | { | |
8ed67789 | 2886 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
101367c2 | 2887 | fib6_rules_cleanup(); |
1da177e4 | 2888 | xfrm6_fini(); |
1da177e4 | 2889 | fib6_gc_cleanup(); |
8ed67789 | 2890 | unregister_pernet_subsys(&ip6_route_net_ops); |
41bb78b4 | 2891 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
f2fc6a54 | 2892 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
1da177e4 | 2893 | } |