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ipv6: handle Redirect ICMP Message with no Redirected Header option
[linux-2.6/btrfs-unstable.git] / net / ipv6 / route.c
blob8d9a93ed9c5926924b809b5bb68b267c07f3ca61
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
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.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/xfrm.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
61
62 #include <asm/uaccess.h>
63
64 #ifdef CONFIG_SYSCTL
65 #include <linux/sysctl.h>
66 #endif
67
68 enum rt6_nud_state {
69 RT6_NUD_FAIL_HARD = -2,
70 RT6_NUD_FAIL_SOFT = -1,
71 RT6_NUD_SUCCEED = 1
72 };
73
74 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
75 const struct in6_addr *dest);
76 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
77 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
78 static unsigned int ip6_mtu(const struct dst_entry *dst);
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);
83 static int ip6_dst_gc(struct dst_ops *ops);
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, struct sock *sk,
89 struct sk_buff *skb, u32 mtu);
90 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
91 struct sk_buff *skb);
92 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
93
94 #ifdef CONFIG_IPV6_ROUTE_INFO
95 static struct rt6_info *rt6_add_route_info(struct net *net,
96 const struct in6_addr *prefix, int prefixlen,
97 const struct in6_addr *gwaddr, int ifindex,
98 unsigned int pref);
99 static struct rt6_info *rt6_get_route_info(struct net *net,
100 const struct in6_addr *prefix, int prefixlen,
101 const struct in6_addr *gwaddr, int ifindex);
102 #endif
103
104 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
105 {
106 struct rt6_info *rt = (struct rt6_info *) dst;
107 struct inet_peer *peer;
108 u32 *p = NULL;
109
110 if (!(rt->dst.flags & DST_HOST))
111 return NULL;
112
113 peer = rt6_get_peer_create(rt);
114 if (peer) {
115 u32 *old_p = __DST_METRICS_PTR(old);
116 unsigned long prev, new;
117
118 p = peer->metrics;
119 if (inet_metrics_new(peer))
120 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
121
122 new = (unsigned long) p;
123 prev = cmpxchg(&dst->_metrics, old, new);
124
125 if (prev != old) {
126 p = __DST_METRICS_PTR(prev);
127 if (prev & DST_METRICS_READ_ONLY)
128 p = NULL;
129 }
130 }
131 return p;
132 }
133
134 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
135 struct sk_buff *skb,
136 const void *daddr)
137 {
138 struct in6_addr *p = &rt->rt6i_gateway;
139
140 if (!ipv6_addr_any(p))
141 return (const void *) p;
142 else if (skb)
143 return &ipv6_hdr(skb)->daddr;
144 return daddr;
145 }
146
147 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
148 struct sk_buff *skb,
149 const void *daddr)
150 {
151 struct rt6_info *rt = (struct rt6_info *) dst;
152 struct neighbour *n;
153
154 daddr = choose_neigh_daddr(rt, skb, daddr);
155 n = __ipv6_neigh_lookup(dst->dev, daddr);
156 if (n)
157 return n;
158 return neigh_create(&nd_tbl, daddr, dst->dev);
159 }
160
161 static struct dst_ops ip6_dst_ops_template = {
162 .family = AF_INET6,
163 .protocol = cpu_to_be16(ETH_P_IPV6),
164 .gc = ip6_dst_gc,
165 .gc_thresh = 1024,
166 .check = ip6_dst_check,
167 .default_advmss = ip6_default_advmss,
168 .mtu = ip6_mtu,
169 .cow_metrics = ipv6_cow_metrics,
170 .destroy = ip6_dst_destroy,
171 .ifdown = ip6_dst_ifdown,
172 .negative_advice = ip6_negative_advice,
173 .link_failure = ip6_link_failure,
174 .update_pmtu = ip6_rt_update_pmtu,
175 .redirect = rt6_do_redirect,
176 .local_out = __ip6_local_out,
177 .neigh_lookup = ip6_neigh_lookup,
178 };
179
180 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
181 {
182 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
183
184 return mtu ? : dst->dev->mtu;
185 }
186
187 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
188 struct sk_buff *skb, u32 mtu)
189 {
190 }
191
192 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
193 struct sk_buff *skb)
194 {
195 }
196
197 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
198 unsigned long old)
199 {
200 return NULL;
201 }
202
203 static struct dst_ops ip6_dst_blackhole_ops = {
204 .family = AF_INET6,
205 .protocol = cpu_to_be16(ETH_P_IPV6),
206 .destroy = ip6_dst_destroy,
207 .check = ip6_dst_check,
208 .mtu = ip6_blackhole_mtu,
209 .default_advmss = ip6_default_advmss,
210 .update_pmtu = ip6_rt_blackhole_update_pmtu,
211 .redirect = ip6_rt_blackhole_redirect,
212 .cow_metrics = ip6_rt_blackhole_cow_metrics,
213 .neigh_lookup = ip6_neigh_lookup,
214 };
215
216 static const u32 ip6_template_metrics[RTAX_MAX] = {
217 [RTAX_HOPLIMIT - 1] = 0,
218 };
219
220 static const struct rt6_info ip6_null_entry_template = {
221 .dst = {
222 .__refcnt = ATOMIC_INIT(1),
223 .__use = 1,
224 .obsolete = DST_OBSOLETE_FORCE_CHK,
225 .error = -ENETUNREACH,
226 .input = ip6_pkt_discard,
227 .output = ip6_pkt_discard_out,
228 },
229 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
230 .rt6i_protocol = RTPROT_KERNEL,
231 .rt6i_metric = ~(u32) 0,
232 .rt6i_ref = ATOMIC_INIT(1),
233 };
234
235 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
236
237 static int ip6_pkt_prohibit(struct sk_buff *skb);
238 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
239
240 static const struct rt6_info ip6_prohibit_entry_template = {
241 .dst = {
242 .__refcnt = ATOMIC_INIT(1),
243 .__use = 1,
244 .obsolete = DST_OBSOLETE_FORCE_CHK,
245 .error = -EACCES,
246 .input = ip6_pkt_prohibit,
247 .output = ip6_pkt_prohibit_out,
248 },
249 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
250 .rt6i_protocol = RTPROT_KERNEL,
251 .rt6i_metric = ~(u32) 0,
252 .rt6i_ref = ATOMIC_INIT(1),
253 };
254
255 static const struct rt6_info ip6_blk_hole_entry_template = {
256 .dst = {
257 .__refcnt = ATOMIC_INIT(1),
258 .__use = 1,
259 .obsolete = DST_OBSOLETE_FORCE_CHK,
260 .error = -EINVAL,
261 .input = dst_discard,
262 .output = dst_discard,
263 },
264 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
265 .rt6i_protocol = RTPROT_KERNEL,
266 .rt6i_metric = ~(u32) 0,
267 .rt6i_ref = ATOMIC_INIT(1),
268 };
269
270 #endif
271
272 /* allocate dst with ip6_dst_ops */
273 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
274 struct net_device *dev,
275 int flags,
276 struct fib6_table *table)
277 {
278 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
279 0, DST_OBSOLETE_FORCE_CHK, flags);
280
281 if (rt) {
282 struct dst_entry *dst = &rt->dst;
283
284 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
285 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
286 rt->rt6i_genid = rt_genid(net);
287 INIT_LIST_HEAD(&rt->rt6i_siblings);
288 rt->rt6i_nsiblings = 0;
289 }
290 return rt;
291 }
292
293 static void ip6_dst_destroy(struct dst_entry *dst)
294 {
295 struct rt6_info *rt = (struct rt6_info *)dst;
296 struct inet6_dev *idev = rt->rt6i_idev;
297 struct dst_entry *from = dst->from;
298
299 if (!(rt->dst.flags & DST_HOST))
300 dst_destroy_metrics_generic(dst);
301
302 if (idev) {
303 rt->rt6i_idev = NULL;
304 in6_dev_put(idev);
305 }
306
307 dst->from = NULL;
308 dst_release(from);
309
310 if (rt6_has_peer(rt)) {
311 struct inet_peer *peer = rt6_peer_ptr(rt);
312 inet_putpeer(peer);
313 }
314 }
315
316 void rt6_bind_peer(struct rt6_info *rt, int create)
317 {
318 struct inet_peer_base *base;
319 struct inet_peer *peer;
320
321 base = inetpeer_base_ptr(rt->_rt6i_peer);
322 if (!base)
323 return;
324
325 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
326 if (peer) {
327 if (!rt6_set_peer(rt, peer))
328 inet_putpeer(peer);
329 }
330 }
331
332 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
333 int how)
334 {
335 struct rt6_info *rt = (struct rt6_info *)dst;
336 struct inet6_dev *idev = rt->rt6i_idev;
337 struct net_device *loopback_dev =
338 dev_net(dev)->loopback_dev;
339
340 if (dev != loopback_dev) {
341 if (idev && idev->dev == dev) {
342 struct inet6_dev *loopback_idev =
343 in6_dev_get(loopback_dev);
344 if (loopback_idev) {
345 rt->rt6i_idev = loopback_idev;
346 in6_dev_put(idev);
347 }
348 }
349 }
350 }
351
352 static bool rt6_check_expired(const struct rt6_info *rt)
353 {
354 if (rt->rt6i_flags & RTF_EXPIRES) {
355 if (time_after(jiffies, rt->dst.expires))
356 return true;
357 } else if (rt->dst.from) {
358 return rt6_check_expired((struct rt6_info *) rt->dst.from);
359 }
360 return false;
361 }
362
363 static bool rt6_need_strict(const struct in6_addr *daddr)
364 {
365 return ipv6_addr_type(daddr) &
366 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
367 }
368
369 /* Multipath route selection:
370 * Hash based function using packet header and flowlabel.
371 * Adapted from fib_info_hashfn()
372 */
373 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
374 const struct flowi6 *fl6)
375 {
376 unsigned int val = fl6->flowi6_proto;
377
378 val ^= ipv6_addr_hash(&fl6->daddr);
379 val ^= ipv6_addr_hash(&fl6->saddr);
380
381 /* Work only if this not encapsulated */
382 switch (fl6->flowi6_proto) {
383 case IPPROTO_UDP:
384 case IPPROTO_TCP:
385 case IPPROTO_SCTP:
386 val ^= (__force u16)fl6->fl6_sport;
387 val ^= (__force u16)fl6->fl6_dport;
388 break;
389
390 case IPPROTO_ICMPV6:
391 val ^= (__force u16)fl6->fl6_icmp_type;
392 val ^= (__force u16)fl6->fl6_icmp_code;
393 break;
394 }
395 /* RFC6438 recommands to use flowlabel */
396 val ^= (__force u32)fl6->flowlabel;
397
398 /* Perhaps, we need to tune, this function? */
399 val = val ^ (val >> 7) ^ (val >> 12);
400 return val % candidate_count;
401 }
402
403 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
404 struct flowi6 *fl6, int oif,
405 int strict)
406 {
407 struct rt6_info *sibling, *next_sibling;
408 int route_choosen;
409
410 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
411 /* Don't change the route, if route_choosen == 0
412 * (siblings does not include ourself)
413 */
414 if (route_choosen)
415 list_for_each_entry_safe(sibling, next_sibling,
416 &match->rt6i_siblings, rt6i_siblings) {
417 route_choosen--;
418 if (route_choosen == 0) {
419 if (rt6_score_route(sibling, oif, strict) < 0)
420 break;
421 match = sibling;
422 break;
423 }
424 }
425 return match;
426 }
427
428 /*
429 * Route lookup. Any table->tb6_lock is implied.
430 */
431
432 static inline struct rt6_info *rt6_device_match(struct net *net,
433 struct rt6_info *rt,
434 const struct in6_addr *saddr,
435 int oif,
436 int flags)
437 {
438 struct rt6_info *local = NULL;
439 struct rt6_info *sprt;
440
441 if (!oif && ipv6_addr_any(saddr))
442 goto out;
443
444 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
445 struct net_device *dev = sprt->dst.dev;
446
447 if (oif) {
448 if (dev->ifindex == oif)
449 return sprt;
450 if (dev->flags & IFF_LOOPBACK) {
451 if (!sprt->rt6i_idev ||
452 sprt->rt6i_idev->dev->ifindex != oif) {
453 if (flags & RT6_LOOKUP_F_IFACE && oif)
454 continue;
455 if (local && (!oif ||
456 local->rt6i_idev->dev->ifindex == oif))
457 continue;
458 }
459 local = sprt;
460 }
461 } else {
462 if (ipv6_chk_addr(net, saddr, dev,
463 flags & RT6_LOOKUP_F_IFACE))
464 return sprt;
465 }
466 }
467
468 if (oif) {
469 if (local)
470 return local;
471
472 if (flags & RT6_LOOKUP_F_IFACE)
473 return net->ipv6.ip6_null_entry;
474 }
475 out:
476 return rt;
477 }
478
479 #ifdef CONFIG_IPV6_ROUTER_PREF
480 static void rt6_probe(struct rt6_info *rt)
481 {
482 struct neighbour *neigh;
483 /*
484 * Okay, this does not seem to be appropriate
485 * for now, however, we need to check if it
486 * is really so; aka Router Reachability Probing.
487 *
488 * Router Reachability Probe MUST be rate-limited
489 * to no more than one per minute.
490 */
491 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
492 return;
493 rcu_read_lock_bh();
494 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
495 if (neigh) {
496 write_lock(&neigh->lock);
497 if (neigh->nud_state & NUD_VALID)
498 goto out;
499 }
500
501 if (!neigh ||
502 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
503 struct in6_addr mcaddr;
504 struct in6_addr *target;
505
506 if (neigh) {
507 neigh->updated = jiffies;
508 write_unlock(&neigh->lock);
509 }
510
511 target = (struct in6_addr *)&rt->rt6i_gateway;
512 addrconf_addr_solict_mult(target, &mcaddr);
513 ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL);
514 } else {
515 out:
516 write_unlock(&neigh->lock);
517 }
518 rcu_read_unlock_bh();
519 }
520 #else
521 static inline void rt6_probe(struct rt6_info *rt)
522 {
523 }
524 #endif
525
526 /*
527 * Default Router Selection (RFC 2461 6.3.6)
528 */
529 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
530 {
531 struct net_device *dev = rt->dst.dev;
532 if (!oif || dev->ifindex == oif)
533 return 2;
534 if ((dev->flags & IFF_LOOPBACK) &&
535 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
536 return 1;
537 return 0;
538 }
539
540 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
541 {
542 struct neighbour *neigh;
543 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
544
545 if (rt->rt6i_flags & RTF_NONEXTHOP ||
546 !(rt->rt6i_flags & RTF_GATEWAY))
547 return RT6_NUD_SUCCEED;
548
549 rcu_read_lock_bh();
550 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
551 if (neigh) {
552 read_lock(&neigh->lock);
553 if (neigh->nud_state & NUD_VALID)
554 ret = RT6_NUD_SUCCEED;
555 #ifdef CONFIG_IPV6_ROUTER_PREF
556 else if (!(neigh->nud_state & NUD_FAILED))
557 ret = RT6_NUD_SUCCEED;
558 #endif
559 read_unlock(&neigh->lock);
560 } else {
561 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
562 RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
563 }
564 rcu_read_unlock_bh();
565
566 return ret;
567 }
568
569 static int rt6_score_route(struct rt6_info *rt, int oif,
570 int strict)
571 {
572 int m;
573
574 m = rt6_check_dev(rt, oif);
575 if (!m && (strict & RT6_LOOKUP_F_IFACE))
576 return RT6_NUD_FAIL_HARD;
577 #ifdef CONFIG_IPV6_ROUTER_PREF
578 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
579 #endif
580 if (strict & RT6_LOOKUP_F_REACHABLE) {
581 int n = rt6_check_neigh(rt);
582 if (n < 0)
583 return n;
584 }
585 return m;
586 }
587
588 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
589 int *mpri, struct rt6_info *match,
590 bool *do_rr)
591 {
592 int m;
593 bool match_do_rr = false;
594
595 if (rt6_check_expired(rt))
596 goto out;
597
598 m = rt6_score_route(rt, oif, strict);
599 if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) {
600 match_do_rr = true;
601 m = 0; /* lowest valid score */
602 } else if (m < 0) {
603 goto out;
604 }
605
606 if (strict & RT6_LOOKUP_F_REACHABLE)
607 rt6_probe(rt);
608
609 if (m > *mpri) {
610 *do_rr = match_do_rr;
611 *mpri = m;
612 match = rt;
613 }
614 out:
615 return match;
616 }
617
618 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
619 struct rt6_info *rr_head,
620 u32 metric, int oif, int strict,
621 bool *do_rr)
622 {
623 struct rt6_info *rt, *match;
624 int mpri = -1;
625
626 match = NULL;
627 for (rt = rr_head; rt && rt->rt6i_metric == metric;
628 rt = rt->dst.rt6_next)
629 match = find_match(rt, oif, strict, &mpri, match, do_rr);
630 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
631 rt = rt->dst.rt6_next)
632 match = find_match(rt, oif, strict, &mpri, match, do_rr);
633
634 return match;
635 }
636
637 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
638 {
639 struct rt6_info *match, *rt0;
640 struct net *net;
641 bool do_rr = false;
642
643 rt0 = fn->rr_ptr;
644 if (!rt0)
645 fn->rr_ptr = rt0 = fn->leaf;
646
647 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
648 &do_rr);
649
650 if (do_rr) {
651 struct rt6_info *next = rt0->dst.rt6_next;
652
653 /* no entries matched; do round-robin */
654 if (!next || next->rt6i_metric != rt0->rt6i_metric)
655 next = fn->leaf;
656
657 if (next != rt0)
658 fn->rr_ptr = next;
659 }
660
661 net = dev_net(rt0->dst.dev);
662 return match ? match : net->ipv6.ip6_null_entry;
663 }
664
665 #ifdef CONFIG_IPV6_ROUTE_INFO
666 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
667 const struct in6_addr *gwaddr)
668 {
669 struct net *net = dev_net(dev);
670 struct route_info *rinfo = (struct route_info *) opt;
671 struct in6_addr prefix_buf, *prefix;
672 unsigned int pref;
673 unsigned long lifetime;
674 struct rt6_info *rt;
675
676 if (len < sizeof(struct route_info)) {
677 return -EINVAL;
678 }
679
680 /* Sanity check for prefix_len and length */
681 if (rinfo->length > 3) {
682 return -EINVAL;
683 } else if (rinfo->prefix_len > 128) {
684 return -EINVAL;
685 } else if (rinfo->prefix_len > 64) {
686 if (rinfo->length < 2) {
687 return -EINVAL;
688 }
689 } else if (rinfo->prefix_len > 0) {
690 if (rinfo->length < 1) {
691 return -EINVAL;
692 }
693 }
694
695 pref = rinfo->route_pref;
696 if (pref == ICMPV6_ROUTER_PREF_INVALID)
697 return -EINVAL;
698
699 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
700
701 if (rinfo->length == 3)
702 prefix = (struct in6_addr *)rinfo->prefix;
703 else {
704 /* this function is safe */
705 ipv6_addr_prefix(&prefix_buf,
706 (struct in6_addr *)rinfo->prefix,
707 rinfo->prefix_len);
708 prefix = &prefix_buf;
709 }
710
711 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
712 dev->ifindex);
713
714 if (rt && !lifetime) {
715 ip6_del_rt(rt);
716 rt = NULL;
717 }
718
719 if (!rt && lifetime)
720 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
721 pref);
722 else if (rt)
723 rt->rt6i_flags = RTF_ROUTEINFO |
724 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
725
726 if (rt) {
727 if (!addrconf_finite_timeout(lifetime))
728 rt6_clean_expires(rt);
729 else
730 rt6_set_expires(rt, jiffies + HZ * lifetime);
731
732 ip6_rt_put(rt);
733 }
734 return 0;
735 }
736 #endif
737
738 #define BACKTRACK(__net, saddr) \
739 do { \
740 if (rt == __net->ipv6.ip6_null_entry) { \
741 struct fib6_node *pn; \
742 while (1) { \
743 if (fn->fn_flags & RTN_TL_ROOT) \
744 goto out; \
745 pn = fn->parent; \
746 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
747 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
748 else \
749 fn = pn; \
750 if (fn->fn_flags & RTN_RTINFO) \
751 goto restart; \
752 } \
753 } \
754 } while (0)
755
756 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
757 struct fib6_table *table,
758 struct flowi6 *fl6, int flags)
759 {
760 struct fib6_node *fn;
761 struct rt6_info *rt;
762
763 read_lock_bh(&table->tb6_lock);
764 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
765 restart:
766 rt = fn->leaf;
767 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
768 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
769 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
770 BACKTRACK(net, &fl6->saddr);
771 out:
772 dst_use(&rt->dst, jiffies);
773 read_unlock_bh(&table->tb6_lock);
774 return rt;
775
776 }
777
778 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
779 int flags)
780 {
781 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
782 }
783 EXPORT_SYMBOL_GPL(ip6_route_lookup);
784
785 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
786 const struct in6_addr *saddr, int oif, int strict)
787 {
788 struct flowi6 fl6 = {
789 .flowi6_oif = oif,
790 .daddr = *daddr,
791 };
792 struct dst_entry *dst;
793 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
794
795 if (saddr) {
796 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
797 flags |= RT6_LOOKUP_F_HAS_SADDR;
798 }
799
800 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
801 if (dst->error == 0)
802 return (struct rt6_info *) dst;
803
804 dst_release(dst);
805
806 return NULL;
807 }
808
809 EXPORT_SYMBOL(rt6_lookup);
810
811 /* ip6_ins_rt is called with FREE table->tb6_lock.
812 It takes new route entry, the addition fails by any reason the
813 route is freed. In any case, if caller does not hold it, it may
814 be destroyed.
815 */
816
817 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
818 {
819 int err;
820 struct fib6_table *table;
821
822 table = rt->rt6i_table;
823 write_lock_bh(&table->tb6_lock);
824 err = fib6_add(&table->tb6_root, rt, info);
825 write_unlock_bh(&table->tb6_lock);
826
827 return err;
828 }
829
830 int ip6_ins_rt(struct rt6_info *rt)
831 {
832 struct nl_info info = {
833 .nl_net = dev_net(rt->dst.dev),
834 };
835 return __ip6_ins_rt(rt, &info);
836 }
837
838 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
839 const struct in6_addr *daddr,
840 const struct in6_addr *saddr)
841 {
842 struct rt6_info *rt;
843
844 /*
845 * Clone the route.
846 */
847
848 rt = ip6_rt_copy(ort, daddr);
849
850 if (rt) {
851 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
852 if (ort->rt6i_dst.plen != 128 &&
853 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
854 rt->rt6i_flags |= RTF_ANYCAST;
855 rt->rt6i_gateway = *daddr;
856 }
857
858 rt->rt6i_flags |= RTF_CACHE;
859
860 #ifdef CONFIG_IPV6_SUBTREES
861 if (rt->rt6i_src.plen && saddr) {
862 rt->rt6i_src.addr = *saddr;
863 rt->rt6i_src.plen = 128;
864 }
865 #endif
866 }
867
868 return rt;
869 }
870
871 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
872 const struct in6_addr *daddr)
873 {
874 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
875
876 if (rt)
877 rt->rt6i_flags |= RTF_CACHE;
878 return rt;
879 }
880
881 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
882 struct flowi6 *fl6, int flags)
883 {
884 struct fib6_node *fn;
885 struct rt6_info *rt, *nrt;
886 int strict = 0;
887 int attempts = 3;
888 int err;
889 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
890
891 strict |= flags & RT6_LOOKUP_F_IFACE;
892
893 relookup:
894 read_lock_bh(&table->tb6_lock);
895
896 restart_2:
897 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
898
899 restart:
900 rt = rt6_select(fn, oif, strict | reachable);
901 if (rt->rt6i_nsiblings)
902 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
903 BACKTRACK(net, &fl6->saddr);
904 if (rt == net->ipv6.ip6_null_entry ||
905 rt->rt6i_flags & RTF_CACHE)
906 goto out;
907
908 dst_hold(&rt->dst);
909 read_unlock_bh(&table->tb6_lock);
910
911 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
912 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
913 else if (!(rt->dst.flags & DST_HOST))
914 nrt = rt6_alloc_clone(rt, &fl6->daddr);
915 else
916 goto out2;
917
918 ip6_rt_put(rt);
919 rt = nrt ? : net->ipv6.ip6_null_entry;
920
921 dst_hold(&rt->dst);
922 if (nrt) {
923 err = ip6_ins_rt(nrt);
924 if (!err)
925 goto out2;
926 }
927
928 if (--attempts <= 0)
929 goto out2;
930
931 /*
932 * Race condition! In the gap, when table->tb6_lock was
933 * released someone could insert this route. Relookup.
934 */
935 ip6_rt_put(rt);
936 goto relookup;
937
938 out:
939 if (reachable) {
940 reachable = 0;
941 goto restart_2;
942 }
943 dst_hold(&rt->dst);
944 read_unlock_bh(&table->tb6_lock);
945 out2:
946 rt->dst.lastuse = jiffies;
947 rt->dst.__use++;
948
949 return rt;
950 }
951
952 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
953 struct flowi6 *fl6, int flags)
954 {
955 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
956 }
957
958 static struct dst_entry *ip6_route_input_lookup(struct net *net,
959 struct net_device *dev,
960 struct flowi6 *fl6, int flags)
961 {
962 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
963 flags |= RT6_LOOKUP_F_IFACE;
964
965 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
966 }
967
968 void ip6_route_input(struct sk_buff *skb)
969 {
970 const struct ipv6hdr *iph = ipv6_hdr(skb);
971 struct net *net = dev_net(skb->dev);
972 int flags = RT6_LOOKUP_F_HAS_SADDR;
973 struct flowi6 fl6 = {
974 .flowi6_iif = skb->dev->ifindex,
975 .daddr = iph->daddr,
976 .saddr = iph->saddr,
977 .flowlabel = ip6_flowinfo(iph),
978 .flowi6_mark = skb->mark,
979 .flowi6_proto = iph->nexthdr,
980 };
981
982 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
983 }
984
985 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
986 struct flowi6 *fl6, int flags)
987 {
988 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
989 }
990
991 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
992 struct flowi6 *fl6)
993 {
994 int flags = 0;
995
996 fl6->flowi6_iif = LOOPBACK_IFINDEX;
997
998 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
999 flags |= RT6_LOOKUP_F_IFACE;
1000
1001 if (!ipv6_addr_any(&fl6->saddr))
1002 flags |= RT6_LOOKUP_F_HAS_SADDR;
1003 else if (sk)
1004 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1005
1006 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1007 }
1008
1009 EXPORT_SYMBOL(ip6_route_output);
1010
1011 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1012 {
1013 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1014 struct dst_entry *new = NULL;
1015
1016 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1017 if (rt) {
1018 new = &rt->dst;
1019
1020 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1021 rt6_init_peer(rt, net->ipv6.peers);
1022
1023 new->__use = 1;
1024 new->input = dst_discard;
1025 new->output = dst_discard;
1026
1027 if (dst_metrics_read_only(&ort->dst))
1028 new->_metrics = ort->dst._metrics;
1029 else
1030 dst_copy_metrics(new, &ort->dst);
1031 rt->rt6i_idev = ort->rt6i_idev;
1032 if (rt->rt6i_idev)
1033 in6_dev_hold(rt->rt6i_idev);
1034
1035 rt->rt6i_gateway = ort->rt6i_gateway;
1036 rt->rt6i_flags = ort->rt6i_flags;
1037 rt->rt6i_metric = 0;
1038
1039 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1040 #ifdef CONFIG_IPV6_SUBTREES
1041 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1042 #endif
1043
1044 dst_free(new);
1045 }
1046
1047 dst_release(dst_orig);
1048 return new ? new : ERR_PTR(-ENOMEM);
1049 }
1050
1051 /*
1052 * Destination cache support functions
1053 */
1054
1055 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1056 {
1057 struct rt6_info *rt;
1058
1059 rt = (struct rt6_info *) dst;
1060
1061 /* All IPV6 dsts are created with ->obsolete set to the value
1062 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1063 * into this function always.
1064 */
1065 if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1066 return NULL;
1067
1068 if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
1069 return dst;
1070
1071 return NULL;
1072 }
1073
1074 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1075 {
1076 struct rt6_info *rt = (struct rt6_info *) dst;
1077
1078 if (rt) {
1079 if (rt->rt6i_flags & RTF_CACHE) {
1080 if (rt6_check_expired(rt)) {
1081 ip6_del_rt(rt);
1082 dst = NULL;
1083 }
1084 } else {
1085 dst_release(dst);
1086 dst = NULL;
1087 }
1088 }
1089 return dst;
1090 }
1091
1092 static void ip6_link_failure(struct sk_buff *skb)
1093 {
1094 struct rt6_info *rt;
1095
1096 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1097
1098 rt = (struct rt6_info *) skb_dst(skb);
1099 if (rt) {
1100 if (rt->rt6i_flags & RTF_CACHE) {
1101 dst_hold(&rt->dst);
1102 if (ip6_del_rt(rt))
1103 dst_free(&rt->dst);
1104 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1105 rt->rt6i_node->fn_sernum = -1;
1106 }
1107 }
1108 }
1109
1110 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1111 struct sk_buff *skb, u32 mtu)
1112 {
1113 struct rt6_info *rt6 = (struct rt6_info*)dst;
1114
1115 dst_confirm(dst);
1116 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1117 struct net *net = dev_net(dst->dev);
1118
1119 rt6->rt6i_flags |= RTF_MODIFIED;
1120 if (mtu < IPV6_MIN_MTU) {
1121 u32 features = dst_metric(dst, RTAX_FEATURES);
1122 mtu = IPV6_MIN_MTU;
1123 features |= RTAX_FEATURE_ALLFRAG;
1124 dst_metric_set(dst, RTAX_FEATURES, features);
1125 }
1126 dst_metric_set(dst, RTAX_MTU, mtu);
1127 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1128 }
1129 }
1130
1131 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1132 int oif, u32 mark)
1133 {
1134 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1135 struct dst_entry *dst;
1136 struct flowi6 fl6;
1137
1138 memset(&fl6, 0, sizeof(fl6));
1139 fl6.flowi6_oif = oif;
1140 fl6.flowi6_mark = mark;
1141 fl6.flowi6_flags = 0;
1142 fl6.daddr = iph->daddr;
1143 fl6.saddr = iph->saddr;
1144 fl6.flowlabel = ip6_flowinfo(iph);
1145
1146 dst = ip6_route_output(net, NULL, &fl6);
1147 if (!dst->error)
1148 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1149 dst_release(dst);
1150 }
1151 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1152
1153 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1154 {
1155 ip6_update_pmtu(skb, sock_net(sk), mtu,
1156 sk->sk_bound_dev_if, sk->sk_mark);
1157 }
1158 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1159
1160 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1161 {
1162 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1163 struct dst_entry *dst;
1164 struct flowi6 fl6;
1165
1166 memset(&fl6, 0, sizeof(fl6));
1167 fl6.flowi6_oif = oif;
1168 fl6.flowi6_mark = mark;
1169 fl6.flowi6_flags = 0;
1170 fl6.daddr = iph->daddr;
1171 fl6.saddr = iph->saddr;
1172 fl6.flowlabel = ip6_flowinfo(iph);
1173
1174 dst = ip6_route_output(net, NULL, &fl6);
1175 if (!dst->error)
1176 rt6_do_redirect(dst, NULL, skb);
1177 dst_release(dst);
1178 }
1179 EXPORT_SYMBOL_GPL(ip6_redirect);
1180
1181 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1182 u32 mark)
1183 {
1184 const struct ipv6hdr *iph = ipv6_hdr(skb);
1185 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1186 struct dst_entry *dst;
1187 struct flowi6 fl6;
1188
1189 memset(&fl6, 0, sizeof(fl6));
1190 fl6.flowi6_oif = oif;
1191 fl6.flowi6_mark = mark;
1192 fl6.flowi6_flags = 0;
1193 fl6.daddr = msg->dest;
1194 fl6.saddr = iph->daddr;
1195
1196 dst = ip6_route_output(net, NULL, &fl6);
1197 if (!dst->error)
1198 rt6_do_redirect(dst, NULL, skb);
1199 dst_release(dst);
1200 }
1201
1202 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1203 {
1204 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1205 }
1206 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1207
1208 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1209 {
1210 struct net_device *dev = dst->dev;
1211 unsigned int mtu = dst_mtu(dst);
1212 struct net *net = dev_net(dev);
1213
1214 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1215
1216 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1217 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1218
1219 /*
1220 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1221 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1222 * IPV6_MAXPLEN is also valid and means: "any MSS,
1223 * rely only on pmtu discovery"
1224 */
1225 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1226 mtu = IPV6_MAXPLEN;
1227 return mtu;
1228 }
1229
1230 static unsigned int ip6_mtu(const struct dst_entry *dst)
1231 {
1232 struct inet6_dev *idev;
1233 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1234
1235 if (mtu)
1236 return mtu;
1237
1238 mtu = IPV6_MIN_MTU;
1239
1240 rcu_read_lock();
1241 idev = __in6_dev_get(dst->dev);
1242 if (idev)
1243 mtu = idev->cnf.mtu6;
1244 rcu_read_unlock();
1245
1246 return mtu;
1247 }
1248
1249 static struct dst_entry *icmp6_dst_gc_list;
1250 static DEFINE_SPINLOCK(icmp6_dst_lock);
1251
1252 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1253 struct flowi6 *fl6)
1254 {
1255 struct dst_entry *dst;
1256 struct rt6_info *rt;
1257 struct inet6_dev *idev = in6_dev_get(dev);
1258 struct net *net = dev_net(dev);
1259
1260 if (unlikely(!idev))
1261 return ERR_PTR(-ENODEV);
1262
1263 rt = ip6_dst_alloc(net, dev, 0, NULL);
1264 if (unlikely(!rt)) {
1265 in6_dev_put(idev);
1266 dst = ERR_PTR(-ENOMEM);
1267 goto out;
1268 }
1269
1270 rt->dst.flags |= DST_HOST;
1271 rt->dst.output = ip6_output;
1272 atomic_set(&rt->dst.__refcnt, 1);
1273 rt->rt6i_dst.addr = fl6->daddr;
1274 rt->rt6i_dst.plen = 128;
1275 rt->rt6i_idev = idev;
1276 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1277
1278 spin_lock_bh(&icmp6_dst_lock);
1279 rt->dst.next = icmp6_dst_gc_list;
1280 icmp6_dst_gc_list = &rt->dst;
1281 spin_unlock_bh(&icmp6_dst_lock);
1282
1283 fib6_force_start_gc(net);
1284
1285 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1286
1287 out:
1288 return dst;
1289 }
1290
1291 int icmp6_dst_gc(void)
1292 {
1293 struct dst_entry *dst, **pprev;
1294 int more = 0;
1295
1296 spin_lock_bh(&icmp6_dst_lock);
1297 pprev = &icmp6_dst_gc_list;
1298
1299 while ((dst = *pprev) != NULL) {
1300 if (!atomic_read(&dst->__refcnt)) {
1301 *pprev = dst->next;
1302 dst_free(dst);
1303 } else {
1304 pprev = &dst->next;
1305 ++more;
1306 }
1307 }
1308
1309 spin_unlock_bh(&icmp6_dst_lock);
1310
1311 return more;
1312 }
1313
1314 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1315 void *arg)
1316 {
1317 struct dst_entry *dst, **pprev;
1318
1319 spin_lock_bh(&icmp6_dst_lock);
1320 pprev = &icmp6_dst_gc_list;
1321 while ((dst = *pprev) != NULL) {
1322 struct rt6_info *rt = (struct rt6_info *) dst;
1323 if (func(rt, arg)) {
1324 *pprev = dst->next;
1325 dst_free(dst);
1326 } else {
1327 pprev = &dst->next;
1328 }
1329 }
1330 spin_unlock_bh(&icmp6_dst_lock);
1331 }
1332
1333 static int ip6_dst_gc(struct dst_ops *ops)
1334 {
1335 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1336 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1337 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1338 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1339 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1340 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1341 int entries;
1342
1343 entries = dst_entries_get_fast(ops);
1344 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1345 entries <= rt_max_size)
1346 goto out;
1347
1348 net->ipv6.ip6_rt_gc_expire++;
1349 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1350 entries = dst_entries_get_slow(ops);
1351 if (entries < ops->gc_thresh)
1352 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1353 out:
1354 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1355 return entries > rt_max_size;
1356 }
1357
1358 int ip6_dst_hoplimit(struct dst_entry *dst)
1359 {
1360 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1361 if (hoplimit == 0) {
1362 struct net_device *dev = dst->dev;
1363 struct inet6_dev *idev;
1364
1365 rcu_read_lock();
1366 idev = __in6_dev_get(dev);
1367 if (idev)
1368 hoplimit = idev->cnf.hop_limit;
1369 else
1370 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1371 rcu_read_unlock();
1372 }
1373 return hoplimit;
1374 }
1375 EXPORT_SYMBOL(ip6_dst_hoplimit);
1376
1377 /*
1378 *
1379 */
1380
1381 int ip6_route_add(struct fib6_config *cfg)
1382 {
1383 int err;
1384 struct net *net = cfg->fc_nlinfo.nl_net;
1385 struct rt6_info *rt = NULL;
1386 struct net_device *dev = NULL;
1387 struct inet6_dev *idev = NULL;
1388 struct fib6_table *table;
1389 int addr_type;
1390
1391 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1392 return -EINVAL;
1393 #ifndef CONFIG_IPV6_SUBTREES
1394 if (cfg->fc_src_len)
1395 return -EINVAL;
1396 #endif
1397 if (cfg->fc_ifindex) {
1398 err = -ENODEV;
1399 dev = dev_get_by_index(net, cfg->fc_ifindex);
1400 if (!dev)
1401 goto out;
1402 idev = in6_dev_get(dev);
1403 if (!idev)
1404 goto out;
1405 }
1406
1407 if (cfg->fc_metric == 0)
1408 cfg->fc_metric = IP6_RT_PRIO_USER;
1409
1410 err = -ENOBUFS;
1411 if (cfg->fc_nlinfo.nlh &&
1412 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1413 table = fib6_get_table(net, cfg->fc_table);
1414 if (!table) {
1415 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1416 table = fib6_new_table(net, cfg->fc_table);
1417 }
1418 } else {
1419 table = fib6_new_table(net, cfg->fc_table);
1420 }
1421
1422 if (!table)
1423 goto out;
1424
1425 rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);
1426
1427 if (!rt) {
1428 err = -ENOMEM;
1429 goto out;
1430 }
1431
1432 if (cfg->fc_flags & RTF_EXPIRES)
1433 rt6_set_expires(rt, jiffies +
1434 clock_t_to_jiffies(cfg->fc_expires));
1435 else
1436 rt6_clean_expires(rt);
1437
1438 if (cfg->fc_protocol == RTPROT_UNSPEC)
1439 cfg->fc_protocol = RTPROT_BOOT;
1440 rt->rt6i_protocol = cfg->fc_protocol;
1441
1442 addr_type = ipv6_addr_type(&cfg->fc_dst);
1443
1444 if (addr_type & IPV6_ADDR_MULTICAST)
1445 rt->dst.input = ip6_mc_input;
1446 else if (cfg->fc_flags & RTF_LOCAL)
1447 rt->dst.input = ip6_input;
1448 else
1449 rt->dst.input = ip6_forward;
1450
1451 rt->dst.output = ip6_output;
1452
1453 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1454 rt->rt6i_dst.plen = cfg->fc_dst_len;
1455 if (rt->rt6i_dst.plen == 128)
1456 rt->dst.flags |= DST_HOST;
1457
1458 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1459 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1460 if (!metrics) {
1461 err = -ENOMEM;
1462 goto out;
1463 }
1464 dst_init_metrics(&rt->dst, metrics, 0);
1465 }
1466 #ifdef CONFIG_IPV6_SUBTREES
1467 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1468 rt->rt6i_src.plen = cfg->fc_src_len;
1469 #endif
1470
1471 rt->rt6i_metric = cfg->fc_metric;
1472
1473 /* We cannot add true routes via loopback here,
1474 they would result in kernel looping; promote them to reject routes
1475 */
1476 if ((cfg->fc_flags & RTF_REJECT) ||
1477 (dev && (dev->flags & IFF_LOOPBACK) &&
1478 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1479 !(cfg->fc_flags & RTF_LOCAL))) {
1480 /* hold loopback dev/idev if we haven't done so. */
1481 if (dev != net->loopback_dev) {
1482 if (dev) {
1483 dev_put(dev);
1484 in6_dev_put(idev);
1485 }
1486 dev = net->loopback_dev;
1487 dev_hold(dev);
1488 idev = in6_dev_get(dev);
1489 if (!idev) {
1490 err = -ENODEV;
1491 goto out;
1492 }
1493 }
1494 rt->dst.output = ip6_pkt_discard_out;
1495 rt->dst.input = ip6_pkt_discard;
1496 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1497 switch (cfg->fc_type) {
1498 case RTN_BLACKHOLE:
1499 rt->dst.error = -EINVAL;
1500 break;
1501 case RTN_PROHIBIT:
1502 rt->dst.error = -EACCES;
1503 break;
1504 case RTN_THROW:
1505 rt->dst.error = -EAGAIN;
1506 break;
1507 default:
1508 rt->dst.error = -ENETUNREACH;
1509 break;
1510 }
1511 goto install_route;
1512 }
1513
1514 if (cfg->fc_flags & RTF_GATEWAY) {
1515 const struct in6_addr *gw_addr;
1516 int gwa_type;
1517
1518 gw_addr = &cfg->fc_gateway;
1519 rt->rt6i_gateway = *gw_addr;
1520 gwa_type = ipv6_addr_type(gw_addr);
1521
1522 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1523 struct rt6_info *grt;
1524
1525 /* IPv6 strictly inhibits using not link-local
1526 addresses as nexthop address.
1527 Otherwise, router will not able to send redirects.
1528 It is very good, but in some (rare!) circumstances
1529 (SIT, PtP, NBMA NOARP links) it is handy to allow
1530 some exceptions. --ANK
1531 */
1532 err = -EINVAL;
1533 if (!(gwa_type & IPV6_ADDR_UNICAST))
1534 goto out;
1535
1536 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1537
1538 err = -EHOSTUNREACH;
1539 if (!grt)
1540 goto out;
1541 if (dev) {
1542 if (dev != grt->dst.dev) {
1543 ip6_rt_put(grt);
1544 goto out;
1545 }
1546 } else {
1547 dev = grt->dst.dev;
1548 idev = grt->rt6i_idev;
1549 dev_hold(dev);
1550 in6_dev_hold(grt->rt6i_idev);
1551 }
1552 if (!(grt->rt6i_flags & RTF_GATEWAY))
1553 err = 0;
1554 ip6_rt_put(grt);
1555
1556 if (err)
1557 goto out;
1558 }
1559 err = -EINVAL;
1560 if (!dev || (dev->flags & IFF_LOOPBACK))
1561 goto out;
1562 }
1563
1564 err = -ENODEV;
1565 if (!dev)
1566 goto out;
1567
1568 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1569 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1570 err = -EINVAL;
1571 goto out;
1572 }
1573 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1574 rt->rt6i_prefsrc.plen = 128;
1575 } else
1576 rt->rt6i_prefsrc.plen = 0;
1577
1578 rt->rt6i_flags = cfg->fc_flags;
1579
1580 install_route:
1581 if (cfg->fc_mx) {
1582 struct nlattr *nla;
1583 int remaining;
1584
1585 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1586 int type = nla_type(nla);
1587
1588 if (type) {
1589 if (type > RTAX_MAX) {
1590 err = -EINVAL;
1591 goto out;
1592 }
1593
1594 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1595 }
1596 }
1597 }
1598
1599 rt->dst.dev = dev;
1600 rt->rt6i_idev = idev;
1601 rt->rt6i_table = table;
1602
1603 cfg->fc_nlinfo.nl_net = dev_net(dev);
1604
1605 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1606
1607 out:
1608 if (dev)
1609 dev_put(dev);
1610 if (idev)
1611 in6_dev_put(idev);
1612 if (rt)
1613 dst_free(&rt->dst);
1614 return err;
1615 }
1616
1617 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1618 {
1619 int err;
1620 struct fib6_table *table;
1621 struct net *net = dev_net(rt->dst.dev);
1622
1623 if (rt == net->ipv6.ip6_null_entry) {
1624 err = -ENOENT;
1625 goto out;
1626 }
1627
1628 table = rt->rt6i_table;
1629 write_lock_bh(&table->tb6_lock);
1630 err = fib6_del(rt, info);
1631 write_unlock_bh(&table->tb6_lock);
1632
1633 out:
1634 ip6_rt_put(rt);
1635 return err;
1636 }
1637
1638 int ip6_del_rt(struct rt6_info *rt)
1639 {
1640 struct nl_info info = {
1641 .nl_net = dev_net(rt->dst.dev),
1642 };
1643 return __ip6_del_rt(rt, &info);
1644 }
1645
1646 static int ip6_route_del(struct fib6_config *cfg)
1647 {
1648 struct fib6_table *table;
1649 struct fib6_node *fn;
1650 struct rt6_info *rt;
1651 int err = -ESRCH;
1652
1653 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1654 if (!table)
1655 return err;
1656
1657 read_lock_bh(&table->tb6_lock);
1658
1659 fn = fib6_locate(&table->tb6_root,
1660 &cfg->fc_dst, cfg->fc_dst_len,
1661 &cfg->fc_src, cfg->fc_src_len);
1662
1663 if (fn) {
1664 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1665 if (cfg->fc_ifindex &&
1666 (!rt->dst.dev ||
1667 rt->dst.dev->ifindex != cfg->fc_ifindex))
1668 continue;
1669 if (cfg->fc_flags & RTF_GATEWAY &&
1670 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1671 continue;
1672 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1673 continue;
1674 dst_hold(&rt->dst);
1675 read_unlock_bh(&table->tb6_lock);
1676
1677 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1678 }
1679 }
1680 read_unlock_bh(&table->tb6_lock);
1681
1682 return err;
1683 }
1684
1685 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1686 {
1687 struct net *net = dev_net(skb->dev);
1688 struct netevent_redirect netevent;
1689 struct rt6_info *rt, *nrt = NULL;
1690 struct ndisc_options ndopts;
1691 struct inet6_dev *in6_dev;
1692 struct neighbour *neigh;
1693 struct rd_msg *msg;
1694 int optlen, on_link;
1695 u8 *lladdr;
1696
1697 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1698 optlen -= sizeof(*msg);
1699
1700 if (optlen < 0) {
1701 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1702 return;
1703 }
1704
1705 msg = (struct rd_msg *)icmp6_hdr(skb);
1706
1707 if (ipv6_addr_is_multicast(&msg->dest)) {
1708 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1709 return;
1710 }
1711
1712 on_link = 0;
1713 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1714 on_link = 1;
1715 } else if (ipv6_addr_type(&msg->target) !=
1716 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1717 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1718 return;
1719 }
1720
1721 in6_dev = __in6_dev_get(skb->dev);
1722 if (!in6_dev)
1723 return;
1724 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1725 return;
1726
1727 /* RFC2461 8.1:
1728 * The IP source address of the Redirect MUST be the same as the current
1729 * first-hop router for the specified ICMP Destination Address.
1730 */
1731
1732 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1733 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1734 return;
1735 }
1736
1737 lladdr = NULL;
1738 if (ndopts.nd_opts_tgt_lladdr) {
1739 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1740 skb->dev);
1741 if (!lladdr) {
1742 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1743 return;
1744 }
1745 }
1746
1747 rt = (struct rt6_info *) dst;
1748 if (rt == net->ipv6.ip6_null_entry) {
1749 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1750 return;
1751 }
1752
1753 /* Redirect received -> path was valid.
1754 * Look, redirects are sent only in response to data packets,
1755 * so that this nexthop apparently is reachable. --ANK
1756 */
1757 dst_confirm(&rt->dst);
1758
1759 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1760 if (!neigh)
1761 return;
1762
1763 /*
1764 * We have finally decided to accept it.
1765 */
1766
1767 neigh_update(neigh, lladdr, NUD_STALE,
1768 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1769 NEIGH_UPDATE_F_OVERRIDE|
1770 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1771 NEIGH_UPDATE_F_ISROUTER))
1772 );
1773
1774 nrt = ip6_rt_copy(rt, &msg->dest);
1775 if (!nrt)
1776 goto out;
1777
1778 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1779 if (on_link)
1780 nrt->rt6i_flags &= ~RTF_GATEWAY;
1781
1782 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1783
1784 if (ip6_ins_rt(nrt))
1785 goto out;
1786
1787 netevent.old = &rt->dst;
1788 netevent.new = &nrt->dst;
1789 netevent.daddr = &msg->dest;
1790 netevent.neigh = neigh;
1791 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1792
1793 if (rt->rt6i_flags & RTF_CACHE) {
1794 rt = (struct rt6_info *) dst_clone(&rt->dst);
1795 ip6_del_rt(rt);
1796 }
1797
1798 out:
1799 neigh_release(neigh);
1800 }
1801
1802 /*
1803 * Misc support functions
1804 */
1805
1806 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1807 const struct in6_addr *dest)
1808 {
1809 struct net *net = dev_net(ort->dst.dev);
1810 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1811 ort->rt6i_table);
1812
1813 if (rt) {
1814 rt->dst.input = ort->dst.input;
1815 rt->dst.output = ort->dst.output;
1816 rt->dst.flags |= DST_HOST;
1817
1818 rt->rt6i_dst.addr = *dest;
1819 rt->rt6i_dst.plen = 128;
1820 dst_copy_metrics(&rt->dst, &ort->dst);
1821 rt->dst.error = ort->dst.error;
1822 rt->rt6i_idev = ort->rt6i_idev;
1823 if (rt->rt6i_idev)
1824 in6_dev_hold(rt->rt6i_idev);
1825 rt->dst.lastuse = jiffies;
1826
1827 rt->rt6i_gateway = ort->rt6i_gateway;
1828 rt->rt6i_flags = ort->rt6i_flags;
1829 if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
1830 (RTF_DEFAULT | RTF_ADDRCONF))
1831 rt6_set_from(rt, ort);
1832 rt->rt6i_metric = 0;
1833
1834 #ifdef CONFIG_IPV6_SUBTREES
1835 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1836 #endif
1837 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1838 rt->rt6i_table = ort->rt6i_table;
1839 }
1840 return rt;
1841 }
1842
1843 #ifdef CONFIG_IPV6_ROUTE_INFO
1844 static struct rt6_info *rt6_get_route_info(struct net *net,
1845 const struct in6_addr *prefix, int prefixlen,
1846 const struct in6_addr *gwaddr, int ifindex)
1847 {
1848 struct fib6_node *fn;
1849 struct rt6_info *rt = NULL;
1850 struct fib6_table *table;
1851
1852 table = fib6_get_table(net, RT6_TABLE_INFO);
1853 if (!table)
1854 return NULL;
1855
1856 read_lock_bh(&table->tb6_lock);
1857 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1858 if (!fn)
1859 goto out;
1860
1861 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1862 if (rt->dst.dev->ifindex != ifindex)
1863 continue;
1864 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1865 continue;
1866 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1867 continue;
1868 dst_hold(&rt->dst);
1869 break;
1870 }
1871 out:
1872 read_unlock_bh(&table->tb6_lock);
1873 return rt;
1874 }
1875
1876 static struct rt6_info *rt6_add_route_info(struct net *net,
1877 const struct in6_addr *prefix, int prefixlen,
1878 const struct in6_addr *gwaddr, int ifindex,
1879 unsigned int pref)
1880 {
1881 struct fib6_config cfg = {
1882 .fc_table = RT6_TABLE_INFO,
1883 .fc_metric = IP6_RT_PRIO_USER,
1884 .fc_ifindex = ifindex,
1885 .fc_dst_len = prefixlen,
1886 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1887 RTF_UP | RTF_PREF(pref),
1888 .fc_nlinfo.portid = 0,
1889 .fc_nlinfo.nlh = NULL,
1890 .fc_nlinfo.nl_net = net,
1891 };
1892
1893 cfg.fc_dst = *prefix;
1894 cfg.fc_gateway = *gwaddr;
1895
1896 /* We should treat it as a default route if prefix length is 0. */
1897 if (!prefixlen)
1898 cfg.fc_flags |= RTF_DEFAULT;
1899
1900 ip6_route_add(&cfg);
1901
1902 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1903 }
1904 #endif
1905
1906 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1907 {
1908 struct rt6_info *rt;
1909 struct fib6_table *table;
1910
1911 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1912 if (!table)
1913 return NULL;
1914
1915 read_lock_bh(&table->tb6_lock);
1916 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1917 if (dev == rt->dst.dev &&
1918 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1919 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1920 break;
1921 }
1922 if (rt)
1923 dst_hold(&rt->dst);
1924 read_unlock_bh(&table->tb6_lock);
1925 return rt;
1926 }
1927
1928 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1929 struct net_device *dev,
1930 unsigned int pref)
1931 {
1932 struct fib6_config cfg = {
1933 .fc_table = RT6_TABLE_DFLT,
1934 .fc_metric = IP6_RT_PRIO_USER,
1935 .fc_ifindex = dev->ifindex,
1936 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1937 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1938 .fc_nlinfo.portid = 0,
1939 .fc_nlinfo.nlh = NULL,
1940 .fc_nlinfo.nl_net = dev_net(dev),
1941 };
1942
1943 cfg.fc_gateway = *gwaddr;
1944
1945 ip6_route_add(&cfg);
1946
1947 return rt6_get_dflt_router(gwaddr, dev);
1948 }
1949
1950 void rt6_purge_dflt_routers(struct net *net)
1951 {
1952 struct rt6_info *rt;
1953 struct fib6_table *table;
1954
1955 /* NOTE: Keep consistent with rt6_get_dflt_router */
1956 table = fib6_get_table(net, RT6_TABLE_DFLT);
1957 if (!table)
1958 return;
1959
1960 restart:
1961 read_lock_bh(&table->tb6_lock);
1962 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1963 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
1964 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
1965 dst_hold(&rt->dst);
1966 read_unlock_bh(&table->tb6_lock);
1967 ip6_del_rt(rt);
1968 goto restart;
1969 }
1970 }
1971 read_unlock_bh(&table->tb6_lock);
1972 }
1973
1974 static void rtmsg_to_fib6_config(struct net *net,
1975 struct in6_rtmsg *rtmsg,
1976 struct fib6_config *cfg)
1977 {
1978 memset(cfg, 0, sizeof(*cfg));
1979
1980 cfg->fc_table = RT6_TABLE_MAIN;
1981 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1982 cfg->fc_metric = rtmsg->rtmsg_metric;
1983 cfg->fc_expires = rtmsg->rtmsg_info;
1984 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1985 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1986 cfg->fc_flags = rtmsg->rtmsg_flags;
1987
1988 cfg->fc_nlinfo.nl_net = net;
1989
1990 cfg->fc_dst = rtmsg->rtmsg_dst;
1991 cfg->fc_src = rtmsg->rtmsg_src;
1992 cfg->fc_gateway = rtmsg->rtmsg_gateway;
1993 }
1994
1995 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1996 {
1997 struct fib6_config cfg;
1998 struct in6_rtmsg rtmsg;
1999 int err;
2000
2001 switch(cmd) {
2002 case SIOCADDRT: /* Add a route */
2003 case SIOCDELRT: /* Delete a route */
2004 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2005 return -EPERM;
2006 err = copy_from_user(&rtmsg, arg,
2007 sizeof(struct in6_rtmsg));
2008 if (err)
2009 return -EFAULT;
2010
2011 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2012
2013 rtnl_lock();
2014 switch (cmd) {
2015 case SIOCADDRT:
2016 err = ip6_route_add(&cfg);
2017 break;
2018 case SIOCDELRT:
2019 err = ip6_route_del(&cfg);
2020 break;
2021 default:
2022 err = -EINVAL;
2023 }
2024 rtnl_unlock();
2025
2026 return err;
2027 }
2028
2029 return -EINVAL;
2030 }
2031
2032 /*
2033 * Drop the packet on the floor
2034 */
2035
2036 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2037 {
2038 int type;
2039 struct dst_entry *dst = skb_dst(skb);
2040 switch (ipstats_mib_noroutes) {
2041 case IPSTATS_MIB_INNOROUTES:
2042 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2043 if (type == IPV6_ADDR_ANY) {
2044 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2045 IPSTATS_MIB_INADDRERRORS);
2046 break;
2047 }
2048 /* FALLTHROUGH */
2049 case IPSTATS_MIB_OUTNOROUTES:
2050 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2051 ipstats_mib_noroutes);
2052 break;
2053 }
2054 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2055 kfree_skb(skb);
2056 return 0;
2057 }
2058
2059 static int ip6_pkt_discard(struct sk_buff *skb)
2060 {
2061 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2062 }
2063
2064 static int ip6_pkt_discard_out(struct sk_buff *skb)
2065 {
2066 skb->dev = skb_dst(skb)->dev;
2067 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2068 }
2069
2070 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2071
2072 static int ip6_pkt_prohibit(struct sk_buff *skb)
2073 {
2074 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2075 }
2076
2077 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2078 {
2079 skb->dev = skb_dst(skb)->dev;
2080 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2081 }
2082
2083 #endif
2084
2085 /*
2086 * Allocate a dst for local (unicast / anycast) address.
2087 */
2088
2089 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2090 const struct in6_addr *addr,
2091 bool anycast)
2092 {
2093 struct net *net = dev_net(idev->dev);
2094 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL);
2095
2096 if (!rt) {
2097 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
2098 return ERR_PTR(-ENOMEM);
2099 }
2100
2101 in6_dev_hold(idev);
2102
2103 rt->dst.flags |= DST_HOST;
2104 rt->dst.input = ip6_input;
2105 rt->dst.output = ip6_output;
2106 rt->rt6i_idev = idev;
2107
2108 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2109 if (anycast)
2110 rt->rt6i_flags |= RTF_ANYCAST;
2111 else
2112 rt->rt6i_flags |= RTF_LOCAL;
2113
2114 rt->rt6i_dst.addr = *addr;
2115 rt->rt6i_dst.plen = 128;
2116 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2117
2118 atomic_set(&rt->dst.__refcnt, 1);
2119
2120 return rt;
2121 }
2122
2123 int ip6_route_get_saddr(struct net *net,
2124 struct rt6_info *rt,
2125 const struct in6_addr *daddr,
2126 unsigned int prefs,
2127 struct in6_addr *saddr)
2128 {
2129 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2130 int err = 0;
2131 if (rt->rt6i_prefsrc.plen)
2132 *saddr = rt->rt6i_prefsrc.addr;
2133 else
2134 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2135 daddr, prefs, saddr);
2136 return err;
2137 }
2138
2139 /* remove deleted ip from prefsrc entries */
2140 struct arg_dev_net_ip {
2141 struct net_device *dev;
2142 struct net *net;
2143 struct in6_addr *addr;
2144 };
2145
2146 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2147 {
2148 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2149 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2150 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2151
2152 if (((void *)rt->dst.dev == dev || !dev) &&
2153 rt != net->ipv6.ip6_null_entry &&
2154 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2155 /* remove prefsrc entry */
2156 rt->rt6i_prefsrc.plen = 0;
2157 }
2158 return 0;
2159 }
2160
2161 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2162 {
2163 struct net *net = dev_net(ifp->idev->dev);
2164 struct arg_dev_net_ip adni = {
2165 .dev = ifp->idev->dev,
2166 .net = net,
2167 .addr = &ifp->addr,
2168 };
2169 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2170 }
2171
2172 struct arg_dev_net {
2173 struct net_device *dev;
2174 struct net *net;
2175 };
2176
2177 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2178 {
2179 const struct arg_dev_net *adn = arg;
2180 const struct net_device *dev = adn->dev;
2181
2182 if ((rt->dst.dev == dev || !dev) &&
2183 rt != adn->net->ipv6.ip6_null_entry)
2184 return -1;
2185
2186 return 0;
2187 }
2188
2189 void rt6_ifdown(struct net *net, struct net_device *dev)
2190 {
2191 struct arg_dev_net adn = {
2192 .dev = dev,
2193 .net = net,
2194 };
2195
2196 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2197 icmp6_clean_all(fib6_ifdown, &adn);
2198 }
2199
2200 struct rt6_mtu_change_arg {
2201 struct net_device *dev;
2202 unsigned int mtu;
2203 };
2204
2205 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2206 {
2207 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2208 struct inet6_dev *idev;
2209
2210 /* In IPv6 pmtu discovery is not optional,
2211 so that RTAX_MTU lock cannot disable it.
2212 We still use this lock to block changes
2213 caused by addrconf/ndisc.
2214 */
2215
2216 idev = __in6_dev_get(arg->dev);
2217 if (!idev)
2218 return 0;
2219
2220 /* For administrative MTU increase, there is no way to discover
2221 IPv6 PMTU increase, so PMTU increase should be updated here.
2222 Since RFC 1981 doesn't include administrative MTU increase
2223 update PMTU increase is a MUST. (i.e. jumbo frame)
2224 */
2225 /*
2226 If new MTU is less than route PMTU, this new MTU will be the
2227 lowest MTU in the path, update the route PMTU to reflect PMTU
2228 decreases; if new MTU is greater than route PMTU, and the
2229 old MTU is the lowest MTU in the path, update the route PMTU
2230 to reflect the increase. In this case if the other nodes' MTU
2231 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2232 PMTU discouvery.
2233 */
2234 if (rt->dst.dev == arg->dev &&
2235 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2236 (dst_mtu(&rt->dst) >= arg->mtu ||
2237 (dst_mtu(&rt->dst) < arg->mtu &&
2238 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2239 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2240 }
2241 return 0;
2242 }
2243
2244 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2245 {
2246 struct rt6_mtu_change_arg arg = {
2247 .dev = dev,
2248 .mtu = mtu,
2249 };
2250
2251 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2252 }
2253
2254 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2255 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2256 [RTA_OIF] = { .type = NLA_U32 },
2257 [RTA_IIF] = { .type = NLA_U32 },
2258 [RTA_PRIORITY] = { .type = NLA_U32 },
2259 [RTA_METRICS] = { .type = NLA_NESTED },
2260 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2261 };
2262
2263 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2264 struct fib6_config *cfg)
2265 {
2266 struct rtmsg *rtm;
2267 struct nlattr *tb[RTA_MAX+1];
2268 int err;
2269
2270 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2271 if (err < 0)
2272 goto errout;
2273
2274 err = -EINVAL;
2275 rtm = nlmsg_data(nlh);
2276 memset(cfg, 0, sizeof(*cfg));
2277
2278 cfg->fc_table = rtm->rtm_table;
2279 cfg->fc_dst_len = rtm->rtm_dst_len;
2280 cfg->fc_src_len = rtm->rtm_src_len;
2281 cfg->fc_flags = RTF_UP;
2282 cfg->fc_protocol = rtm->rtm_protocol;
2283 cfg->fc_type = rtm->rtm_type;
2284
2285 if (rtm->rtm_type == RTN_UNREACHABLE ||
2286 rtm->rtm_type == RTN_BLACKHOLE ||
2287 rtm->rtm_type == RTN_PROHIBIT ||
2288 rtm->rtm_type == RTN_THROW)
2289 cfg->fc_flags |= RTF_REJECT;
2290
2291 if (rtm->rtm_type == RTN_LOCAL)
2292 cfg->fc_flags |= RTF_LOCAL;
2293
2294 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2295 cfg->fc_nlinfo.nlh = nlh;
2296 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2297
2298 if (tb[RTA_GATEWAY]) {
2299 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2300 cfg->fc_flags |= RTF_GATEWAY;
2301 }
2302
2303 if (tb[RTA_DST]) {
2304 int plen = (rtm->rtm_dst_len + 7) >> 3;
2305
2306 if (nla_len(tb[RTA_DST]) < plen)
2307 goto errout;
2308
2309 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2310 }
2311
2312 if (tb[RTA_SRC]) {
2313 int plen = (rtm->rtm_src_len + 7) >> 3;
2314
2315 if (nla_len(tb[RTA_SRC]) < plen)
2316 goto errout;
2317
2318 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2319 }
2320
2321 if (tb[RTA_PREFSRC])
2322 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2323
2324 if (tb[RTA_OIF])
2325 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2326
2327 if (tb[RTA_PRIORITY])
2328 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2329
2330 if (tb[RTA_METRICS]) {
2331 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2332 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2333 }
2334
2335 if (tb[RTA_TABLE])
2336 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2337
2338 if (tb[RTA_MULTIPATH]) {
2339 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2340 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2341 }
2342
2343 err = 0;
2344 errout:
2345 return err;
2346 }
2347
2348 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2349 {
2350 struct fib6_config r_cfg;
2351 struct rtnexthop *rtnh;
2352 int remaining;
2353 int attrlen;
2354 int err = 0, last_err = 0;
2355
2356 beginning:
2357 rtnh = (struct rtnexthop *)cfg->fc_mp;
2358 remaining = cfg->fc_mp_len;
2359
2360 /* Parse a Multipath Entry */
2361 while (rtnh_ok(rtnh, remaining)) {
2362 memcpy(&r_cfg, cfg, sizeof(*cfg));
2363 if (rtnh->rtnh_ifindex)
2364 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2365
2366 attrlen = rtnh_attrlen(rtnh);
2367 if (attrlen > 0) {
2368 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2369
2370 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2371 if (nla) {
2372 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2373 r_cfg.fc_flags |= RTF_GATEWAY;
2374 }
2375 }
2376 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2377 if (err) {
2378 last_err = err;
2379 /* If we are trying to remove a route, do not stop the
2380 * loop when ip6_route_del() fails (because next hop is
2381 * already gone), we should try to remove all next hops.
2382 */
2383 if (add) {
2384 /* If add fails, we should try to delete all
2385 * next hops that have been already added.
2386 */
2387 add = 0;
2388 goto beginning;
2389 }
2390 }
2391 /* Because each route is added like a single route we remove
2392 * this flag after the first nexthop (if there is a collision,
2393 * we have already fail to add the first nexthop:
2394 * fib6_add_rt2node() has reject it).
2395 */
2396 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2397 rtnh = rtnh_next(rtnh, &remaining);
2398 }
2399
2400 return last_err;
2401 }
2402
2403 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2404 {
2405 struct fib6_config cfg;
2406 int err;
2407
2408 err = rtm_to_fib6_config(skb, nlh, &cfg);
2409 if (err < 0)
2410 return err;
2411
2412 if (cfg.fc_mp)
2413 return ip6_route_multipath(&cfg, 0);
2414 else
2415 return ip6_route_del(&cfg);
2416 }
2417
2418 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2419 {
2420 struct fib6_config cfg;
2421 int err;
2422
2423 err = rtm_to_fib6_config(skb, nlh, &cfg);
2424 if (err < 0)
2425 return err;
2426
2427 if (cfg.fc_mp)
2428 return ip6_route_multipath(&cfg, 1);
2429 else
2430 return ip6_route_add(&cfg);
2431 }
2432
2433 static inline size_t rt6_nlmsg_size(void)
2434 {
2435 return NLMSG_ALIGN(sizeof(struct rtmsg))
2436 + nla_total_size(16) /* RTA_SRC */
2437 + nla_total_size(16) /* RTA_DST */
2438 + nla_total_size(16) /* RTA_GATEWAY */
2439 + nla_total_size(16) /* RTA_PREFSRC */
2440 + nla_total_size(4) /* RTA_TABLE */
2441 + nla_total_size(4) /* RTA_IIF */
2442 + nla_total_size(4) /* RTA_OIF */
2443 + nla_total_size(4) /* RTA_PRIORITY */
2444 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2445 + nla_total_size(sizeof(struct rta_cacheinfo));
2446 }
2447
2448 static int rt6_fill_node(struct net *net,
2449 struct sk_buff *skb, struct rt6_info *rt,
2450 struct in6_addr *dst, struct in6_addr *src,
2451 int iif, int type, u32 portid, u32 seq,
2452 int prefix, int nowait, unsigned int flags)
2453 {
2454 struct rtmsg *rtm;
2455 struct nlmsghdr *nlh;
2456 long expires;
2457 u32 table;
2458
2459 if (prefix) { /* user wants prefix routes only */
2460 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2461 /* success since this is not a prefix route */
2462 return 1;
2463 }
2464 }
2465
2466 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2467 if (!nlh)
2468 return -EMSGSIZE;
2469
2470 rtm = nlmsg_data(nlh);
2471 rtm->rtm_family = AF_INET6;
2472 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2473 rtm->rtm_src_len = rt->rt6i_src.plen;
2474 rtm->rtm_tos = 0;
2475 if (rt->rt6i_table)
2476 table = rt->rt6i_table->tb6_id;
2477 else
2478 table = RT6_TABLE_UNSPEC;
2479 rtm->rtm_table = table;
2480 if (nla_put_u32(skb, RTA_TABLE, table))
2481 goto nla_put_failure;
2482 if (rt->rt6i_flags & RTF_REJECT) {
2483 switch (rt->dst.error) {
2484 case -EINVAL:
2485 rtm->rtm_type = RTN_BLACKHOLE;
2486 break;
2487 case -EACCES:
2488 rtm->rtm_type = RTN_PROHIBIT;
2489 break;
2490 case -EAGAIN:
2491 rtm->rtm_type = RTN_THROW;
2492 break;
2493 default:
2494 rtm->rtm_type = RTN_UNREACHABLE;
2495 break;
2496 }
2497 }
2498 else if (rt->rt6i_flags & RTF_LOCAL)
2499 rtm->rtm_type = RTN_LOCAL;
2500 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2501 rtm->rtm_type = RTN_LOCAL;
2502 else
2503 rtm->rtm_type = RTN_UNICAST;
2504 rtm->rtm_flags = 0;
2505 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2506 rtm->rtm_protocol = rt->rt6i_protocol;
2507 if (rt->rt6i_flags & RTF_DYNAMIC)
2508 rtm->rtm_protocol = RTPROT_REDIRECT;
2509 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2510 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2511 rtm->rtm_protocol = RTPROT_RA;
2512 else
2513 rtm->rtm_protocol = RTPROT_KERNEL;
2514 }
2515
2516 if (rt->rt6i_flags & RTF_CACHE)
2517 rtm->rtm_flags |= RTM_F_CLONED;
2518
2519 if (dst) {
2520 if (nla_put(skb, RTA_DST, 16, dst))
2521 goto nla_put_failure;
2522 rtm->rtm_dst_len = 128;
2523 } else if (rtm->rtm_dst_len)
2524 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2525 goto nla_put_failure;
2526 #ifdef CONFIG_IPV6_SUBTREES
2527 if (src) {
2528 if (nla_put(skb, RTA_SRC, 16, src))
2529 goto nla_put_failure;
2530 rtm->rtm_src_len = 128;
2531 } else if (rtm->rtm_src_len &&
2532 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2533 goto nla_put_failure;
2534 #endif
2535 if (iif) {
2536 #ifdef CONFIG_IPV6_MROUTE
2537 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2538 int err = ip6mr_get_route(net, skb, rtm, nowait);
2539 if (err <= 0) {
2540 if (!nowait) {
2541 if (err == 0)
2542 return 0;
2543 goto nla_put_failure;
2544 } else {
2545 if (err == -EMSGSIZE)
2546 goto nla_put_failure;
2547 }
2548 }
2549 } else
2550 #endif
2551 if (nla_put_u32(skb, RTA_IIF, iif))
2552 goto nla_put_failure;
2553 } else if (dst) {
2554 struct in6_addr saddr_buf;
2555 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2556 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2557 goto nla_put_failure;
2558 }
2559
2560 if (rt->rt6i_prefsrc.plen) {
2561 struct in6_addr saddr_buf;
2562 saddr_buf = rt->rt6i_prefsrc.addr;
2563 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2564 goto nla_put_failure;
2565 }
2566
2567 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2568 goto nla_put_failure;
2569
2570 if (rt->rt6i_flags & RTF_GATEWAY) {
2571 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2572 goto nla_put_failure;
2573 }
2574
2575 if (rt->dst.dev &&
2576 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2577 goto nla_put_failure;
2578 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2579 goto nla_put_failure;
2580
2581 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2582
2583 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2584 goto nla_put_failure;
2585
2586 return nlmsg_end(skb, nlh);
2587
2588 nla_put_failure:
2589 nlmsg_cancel(skb, nlh);
2590 return -EMSGSIZE;
2591 }
2592
2593 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2594 {
2595 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2596 int prefix;
2597
2598 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2599 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2600 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2601 } else
2602 prefix = 0;
2603
2604 return rt6_fill_node(arg->net,
2605 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2606 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2607 prefix, 0, NLM_F_MULTI);
2608 }
2609
2610 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2611 {
2612 struct net *net = sock_net(in_skb->sk);
2613 struct nlattr *tb[RTA_MAX+1];
2614 struct rt6_info *rt;
2615 struct sk_buff *skb;
2616 struct rtmsg *rtm;
2617 struct flowi6 fl6;
2618 int err, iif = 0, oif = 0;
2619
2620 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2621 if (err < 0)
2622 goto errout;
2623
2624 err = -EINVAL;
2625 memset(&fl6, 0, sizeof(fl6));
2626
2627 if (tb[RTA_SRC]) {
2628 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2629 goto errout;
2630
2631 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2632 }
2633
2634 if (tb[RTA_DST]) {
2635 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2636 goto errout;
2637
2638 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2639 }
2640
2641 if (tb[RTA_IIF])
2642 iif = nla_get_u32(tb[RTA_IIF]);
2643
2644 if (tb[RTA_OIF])
2645 oif = nla_get_u32(tb[RTA_OIF]);
2646
2647 if (iif) {
2648 struct net_device *dev;
2649 int flags = 0;
2650
2651 dev = __dev_get_by_index(net, iif);
2652 if (!dev) {
2653 err = -ENODEV;
2654 goto errout;
2655 }
2656
2657 fl6.flowi6_iif = iif;
2658
2659 if (!ipv6_addr_any(&fl6.saddr))
2660 flags |= RT6_LOOKUP_F_HAS_SADDR;
2661
2662 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2663 flags);
2664 } else {
2665 fl6.flowi6_oif = oif;
2666
2667 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2668 }
2669
2670 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2671 if (!skb) {
2672 ip6_rt_put(rt);
2673 err = -ENOBUFS;
2674 goto errout;
2675 }
2676
2677 /* Reserve room for dummy headers, this skb can pass
2678 through good chunk of routing engine.
2679 */
2680 skb_reset_mac_header(skb);
2681 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2682
2683 skb_dst_set(skb, &rt->dst);
2684
2685 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2686 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2687 nlh->nlmsg_seq, 0, 0, 0);
2688 if (err < 0) {
2689 kfree_skb(skb);
2690 goto errout;
2691 }
2692
2693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2694 errout:
2695 return err;
2696 }
2697
2698 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2699 {
2700 struct sk_buff *skb;
2701 struct net *net = info->nl_net;
2702 u32 seq;
2703 int err;
2704
2705 err = -ENOBUFS;
2706 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2707
2708 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2709 if (!skb)
2710 goto errout;
2711
2712 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2713 event, info->portid, seq, 0, 0, 0);
2714 if (err < 0) {
2715 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2716 WARN_ON(err == -EMSGSIZE);
2717 kfree_skb(skb);
2718 goto errout;
2719 }
2720 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2721 info->nlh, gfp_any());
2722 return;
2723 errout:
2724 if (err < 0)
2725 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2726 }
2727
2728 static int ip6_route_dev_notify(struct notifier_block *this,
2729 unsigned long event, void *ptr)
2730 {
2731 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2732 struct net *net = dev_net(dev);
2733
2734 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2735 net->ipv6.ip6_null_entry->dst.dev = dev;
2736 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2737 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2738 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2739 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2740 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2741 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2742 #endif
2743 }
2744
2745 return NOTIFY_OK;
2746 }
2747
2748 /*
2749 * /proc
2750 */
2751
2752 #ifdef CONFIG_PROC_FS
2753
2754 struct rt6_proc_arg
2755 {
2756 char *buffer;
2757 int offset;
2758 int length;
2759 int skip;
2760 int len;
2761 };
2762
2763 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2764 {
2765 struct seq_file *m = p_arg;
2766
2767 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2768
2769 #ifdef CONFIG_IPV6_SUBTREES
2770 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2771 #else
2772 seq_puts(m, "00000000000000000000000000000000 00 ");
2773 #endif
2774 if (rt->rt6i_flags & RTF_GATEWAY) {
2775 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2776 } else {
2777 seq_puts(m, "00000000000000000000000000000000");
2778 }
2779 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2780 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2781 rt->dst.__use, rt->rt6i_flags,
2782 rt->dst.dev ? rt->dst.dev->name : "");
2783 return 0;
2784 }
2785
2786 static int ipv6_route_show(struct seq_file *m, void *v)
2787 {
2788 struct net *net = (struct net *)m->private;
2789 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2790 return 0;
2791 }
2792
2793 static int ipv6_route_open(struct inode *inode, struct file *file)
2794 {
2795 return single_open_net(inode, file, ipv6_route_show);
2796 }
2797
2798 static const struct file_operations ipv6_route_proc_fops = {
2799 .owner = THIS_MODULE,
2800 .open = ipv6_route_open,
2801 .read = seq_read,
2802 .llseek = seq_lseek,
2803 .release = single_release_net,
2804 };
2805
2806 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2807 {
2808 struct net *net = (struct net *)seq->private;
2809 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2810 net->ipv6.rt6_stats->fib_nodes,
2811 net->ipv6.rt6_stats->fib_route_nodes,
2812 net->ipv6.rt6_stats->fib_rt_alloc,
2813 net->ipv6.rt6_stats->fib_rt_entries,
2814 net->ipv6.rt6_stats->fib_rt_cache,
2815 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2816 net->ipv6.rt6_stats->fib_discarded_routes);
2817
2818 return 0;
2819 }
2820
2821 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2822 {
2823 return single_open_net(inode, file, rt6_stats_seq_show);
2824 }
2825
2826 static const struct file_operations rt6_stats_seq_fops = {
2827 .owner = THIS_MODULE,
2828 .open = rt6_stats_seq_open,
2829 .read = seq_read,
2830 .llseek = seq_lseek,
2831 .release = single_release_net,
2832 };
2833 #endif /* CONFIG_PROC_FS */
2834
2835 #ifdef CONFIG_SYSCTL
2836
2837 static
2838 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2839 void __user *buffer, size_t *lenp, loff_t *ppos)
2840 {
2841 struct net *net;
2842 int delay;
2843 if (!write)
2844 return -EINVAL;
2845
2846 net = (struct net *)ctl->extra1;
2847 delay = net->ipv6.sysctl.flush_delay;
2848 proc_dointvec(ctl, write, buffer, lenp, ppos);
2849 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2850 return 0;
2851 }
2852
2853 struct ctl_table ipv6_route_table_template[] = {
2854 {
2855 .procname = "flush",
2856 .data = &init_net.ipv6.sysctl.flush_delay,
2857 .maxlen = sizeof(int),
2858 .mode = 0200,
2859 .proc_handler = ipv6_sysctl_rtcache_flush
2860 },
2861 {
2862 .procname = "gc_thresh",
2863 .data = &ip6_dst_ops_template.gc_thresh,
2864 .maxlen = sizeof(int),
2865 .mode = 0644,
2866 .proc_handler = proc_dointvec,
2867 },
2868 {
2869 .procname = "max_size",
2870 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2871 .maxlen = sizeof(int),
2872 .mode = 0644,
2873 .proc_handler = proc_dointvec,
2874 },
2875 {
2876 .procname = "gc_min_interval",
2877 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2878 .maxlen = sizeof(int),
2879 .mode = 0644,
2880 .proc_handler = proc_dointvec_jiffies,
2881 },
2882 {
2883 .procname = "gc_timeout",
2884 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2885 .maxlen = sizeof(int),
2886 .mode = 0644,
2887 .proc_handler = proc_dointvec_jiffies,
2888 },
2889 {
2890 .procname = "gc_interval",
2891 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2892 .maxlen = sizeof(int),
2893 .mode = 0644,
2894 .proc_handler = proc_dointvec_jiffies,
2895 },
2896 {
2897 .procname = "gc_elasticity",
2898 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2899 .maxlen = sizeof(int),
2900 .mode = 0644,
2901 .proc_handler = proc_dointvec,
2902 },
2903 {
2904 .procname = "mtu_expires",
2905 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2906 .maxlen = sizeof(int),
2907 .mode = 0644,
2908 .proc_handler = proc_dointvec_jiffies,
2909 },
2910 {
2911 .procname = "min_adv_mss",
2912 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2913 .maxlen = sizeof(int),
2914 .mode = 0644,
2915 .proc_handler = proc_dointvec,
2916 },
2917 {
2918 .procname = "gc_min_interval_ms",
2919 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2920 .maxlen = sizeof(int),
2921 .mode = 0644,
2922 .proc_handler = proc_dointvec_ms_jiffies,
2923 },
2924 { }
2925 };
2926
2927 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2928 {
2929 struct ctl_table *table;
2930
2931 table = kmemdup(ipv6_route_table_template,
2932 sizeof(ipv6_route_table_template),
2933 GFP_KERNEL);
2934
2935 if (table) {
2936 table[0].data = &net->ipv6.sysctl.flush_delay;
2937 table[0].extra1 = net;
2938 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2939 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2940 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2941 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2942 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2943 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2944 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2945 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2946 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2947
2948 /* Don't export sysctls to unprivileged users */
2949 if (net->user_ns != &init_user_ns)
2950 table[0].procname = NULL;
2951 }
2952
2953 return table;
2954 }
2955 #endif
2956
2957 static int __net_init ip6_route_net_init(struct net *net)
2958 {
2959 int ret = -ENOMEM;
2960
2961 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2962 sizeof(net->ipv6.ip6_dst_ops));
2963
2964 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2965 goto out_ip6_dst_ops;
2966
2967 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2968 sizeof(*net->ipv6.ip6_null_entry),
2969 GFP_KERNEL);
2970 if (!net->ipv6.ip6_null_entry)
2971 goto out_ip6_dst_entries;
2972 net->ipv6.ip6_null_entry->dst.path =
2973 (struct dst_entry *)net->ipv6.ip6_null_entry;
2974 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2975 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2976 ip6_template_metrics, true);
2977
2978 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2979 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2980 sizeof(*net->ipv6.ip6_prohibit_entry),
2981 GFP_KERNEL);
2982 if (!net->ipv6.ip6_prohibit_entry)
2983 goto out_ip6_null_entry;
2984 net->ipv6.ip6_prohibit_entry->dst.path =
2985 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2986 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2987 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2988 ip6_template_metrics, true);
2989
2990 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2991 sizeof(*net->ipv6.ip6_blk_hole_entry),
2992 GFP_KERNEL);
2993 if (!net->ipv6.ip6_blk_hole_entry)
2994 goto out_ip6_prohibit_entry;
2995 net->ipv6.ip6_blk_hole_entry->dst.path =
2996 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2997 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2998 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
2999 ip6_template_metrics, true);
3000 #endif
3001
3002 net->ipv6.sysctl.flush_delay = 0;
3003 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3004 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3005 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3006 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3007 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3008 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3009 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3010
3011 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3012
3013 ret = 0;
3014 out:
3015 return ret;
3016
3017 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3018 out_ip6_prohibit_entry:
3019 kfree(net->ipv6.ip6_prohibit_entry);
3020 out_ip6_null_entry:
3021 kfree(net->ipv6.ip6_null_entry);
3022 #endif
3023 out_ip6_dst_entries:
3024 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3025 out_ip6_dst_ops:
3026 goto out;
3027 }
3028
3029 static void __net_exit ip6_route_net_exit(struct net *net)
3030 {
3031 kfree(net->ipv6.ip6_null_entry);
3032 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3033 kfree(net->ipv6.ip6_prohibit_entry);
3034 kfree(net->ipv6.ip6_blk_hole_entry);
3035 #endif
3036 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3037 }
3038
3039 static int __net_init ip6_route_net_init_late(struct net *net)
3040 {
3041 #ifdef CONFIG_PROC_FS
3042 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3043 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3044 #endif
3045 return 0;
3046 }
3047
3048 static void __net_exit ip6_route_net_exit_late(struct net *net)
3049 {
3050 #ifdef CONFIG_PROC_FS
3051 remove_proc_entry("ipv6_route", net->proc_net);
3052 remove_proc_entry("rt6_stats", net->proc_net);
3053 #endif
3054 }
3055
3056 static struct pernet_operations ip6_route_net_ops = {
3057 .init = ip6_route_net_init,
3058 .exit = ip6_route_net_exit,
3059 };
3060
3061 static int __net_init ipv6_inetpeer_init(struct net *net)
3062 {
3063 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3064
3065 if (!bp)
3066 return -ENOMEM;
3067 inet_peer_base_init(bp);
3068 net->ipv6.peers = bp;
3069 return 0;
3070 }
3071
3072 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3073 {
3074 struct inet_peer_base *bp = net->ipv6.peers;
3075
3076 net->ipv6.peers = NULL;
3077 inetpeer_invalidate_tree(bp);
3078 kfree(bp);
3079 }
3080
3081 static struct pernet_operations ipv6_inetpeer_ops = {
3082 .init = ipv6_inetpeer_init,
3083 .exit = ipv6_inetpeer_exit,
3084 };
3085
3086 static struct pernet_operations ip6_route_net_late_ops = {
3087 .init = ip6_route_net_init_late,
3088 .exit = ip6_route_net_exit_late,
3089 };
3090
3091 static struct notifier_block ip6_route_dev_notifier = {
3092 .notifier_call = ip6_route_dev_notify,
3093 .priority = 0,
3094 };
3095
3096 int __init ip6_route_init(void)
3097 {
3098 int ret;
3099
3100 ret = -ENOMEM;
3101 ip6_dst_ops_template.kmem_cachep =
3102 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3103 SLAB_HWCACHE_ALIGN, NULL);
3104 if (!ip6_dst_ops_template.kmem_cachep)
3105 goto out;
3106
3107 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3108 if (ret)
3109 goto out_kmem_cache;
3110
3111 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3112 if (ret)
3113 goto out_dst_entries;
3114
3115 ret = register_pernet_subsys(&ip6_route_net_ops);
3116 if (ret)
3117 goto out_register_inetpeer;
3118
3119 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3120
3121 /* Registering of the loopback is done before this portion of code,
3122 * the loopback reference in rt6_info will not be taken, do it
3123 * manually for init_net */
3124 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3125 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3126 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3127 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3128 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3129 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3130 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3131 #endif
3132 ret = fib6_init();
3133 if (ret)
3134 goto out_register_subsys;
3135
3136 ret = xfrm6_init();
3137 if (ret)
3138 goto out_fib6_init;
3139
3140 ret = fib6_rules_init();
3141 if (ret)
3142 goto xfrm6_init;
3143
3144 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3145 if (ret)
3146 goto fib6_rules_init;
3147
3148 ret = -ENOBUFS;
3149 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3150 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3151 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3152 goto out_register_late_subsys;
3153
3154 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3155 if (ret)
3156 goto out_register_late_subsys;
3157
3158 out:
3159 return ret;
3160
3161 out_register_late_subsys:
3162 unregister_pernet_subsys(&ip6_route_net_late_ops);
3163 fib6_rules_init:
3164 fib6_rules_cleanup();
3165 xfrm6_init:
3166 xfrm6_fini();
3167 out_fib6_init:
3168 fib6_gc_cleanup();
3169 out_register_subsys:
3170 unregister_pernet_subsys(&ip6_route_net_ops);
3171 out_register_inetpeer:
3172 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3173 out_dst_entries:
3174 dst_entries_destroy(&ip6_dst_blackhole_ops);
3175 out_kmem_cache:
3176 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3177 goto out;
3178 }
3179
3180 void ip6_route_cleanup(void)
3181 {
3182 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3183 unregister_pernet_subsys(&ip6_route_net_late_ops);
3184 fib6_rules_cleanup();
3185 xfrm6_fini();
3186 fib6_gc_cleanup();
3187 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3188 unregister_pernet_subsys(&ip6_route_net_ops);
3189 dst_entries_destroy(&ip6_dst_blackhole_ops);
3190 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3191 }
(deprecated) Btrfs devel tree