?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[linux-2.6/btrfs-unstable.git] / net / ipv6 / route.c
blobbafde82324c57369abfd6f5b37decafadcb08d9c
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 = -3,
70 RT6_NUD_FAIL_PROBE = -2,
71 RT6_NUD_FAIL_DO_RR = -1,
72 RT6_NUD_SUCCEED = 1
73 };
74
75 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
76 const struct in6_addr *dest);
77 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
78 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
79 static unsigned int ip6_mtu(const struct dst_entry *dst);
80 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
81 static void ip6_dst_destroy(struct dst_entry *);
82 static void ip6_dst_ifdown(struct dst_entry *,
83 struct net_device *dev, int how);
84 static int ip6_dst_gc(struct dst_ops *ops);
85
86 static int ip6_pkt_discard(struct sk_buff *skb);
87 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
88 static int ip6_pkt_prohibit(struct sk_buff *skb);
89 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
90 static void ip6_link_failure(struct sk_buff *skb);
91 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
92 struct sk_buff *skb, u32 mtu);
93 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
94 struct sk_buff *skb);
95 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
96
97 #ifdef CONFIG_IPV6_ROUTE_INFO
98 static struct rt6_info *rt6_add_route_info(struct net *net,
99 const struct in6_addr *prefix, int prefixlen,
100 const struct in6_addr *gwaddr, int ifindex,
101 unsigned int pref);
102 static struct rt6_info *rt6_get_route_info(struct net *net,
103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, int ifindex);
105 #endif
106
107 static void rt6_bind_peer(struct rt6_info *rt, int create)
108 {
109 struct inet_peer_base *base;
110 struct inet_peer *peer;
111
112 base = inetpeer_base_ptr(rt->_rt6i_peer);
113 if (!base)
114 return;
115
116 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
117 if (peer) {
118 if (!rt6_set_peer(rt, peer))
119 inet_putpeer(peer);
120 }
121 }
122
123 static struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
124 {
125 if (rt6_has_peer(rt))
126 return rt6_peer_ptr(rt);
127
128 rt6_bind_peer(rt, create);
129 return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
130 }
131
132 static struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
133 {
134 return __rt6_get_peer(rt, 1);
135 }
136
137 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
138 {
139 struct rt6_info *rt = (struct rt6_info *) dst;
140 struct inet_peer *peer;
141 u32 *p = NULL;
142
143 if (!(rt->dst.flags & DST_HOST))
144 return NULL;
145
146 peer = rt6_get_peer_create(rt);
147 if (peer) {
148 u32 *old_p = __DST_METRICS_PTR(old);
149 unsigned long prev, new;
150
151 p = peer->metrics;
152 if (inet_metrics_new(peer) ||
153 (old & DST_METRICS_FORCE_OVERWRITE))
154 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
155
156 new = (unsigned long) p;
157 prev = cmpxchg(&dst->_metrics, old, new);
158
159 if (prev != old) {
160 p = __DST_METRICS_PTR(prev);
161 if (prev & DST_METRICS_READ_ONLY)
162 p = NULL;
163 }
164 }
165 return p;
166 }
167
168 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
169 struct sk_buff *skb,
170 const void *daddr)
171 {
172 struct in6_addr *p = &rt->rt6i_gateway;
173
174 if (!ipv6_addr_any(p))
175 return (const void *) p;
176 else if (skb)
177 return &ipv6_hdr(skb)->daddr;
178 return daddr;
179 }
180
181 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
182 struct sk_buff *skb,
183 const void *daddr)
184 {
185 struct rt6_info *rt = (struct rt6_info *) dst;
186 struct neighbour *n;
187
188 daddr = choose_neigh_daddr(rt, skb, daddr);
189 n = __ipv6_neigh_lookup(dst->dev, daddr);
190 if (n)
191 return n;
192 return neigh_create(&nd_tbl, daddr, dst->dev);
193 }
194
195 static struct dst_ops ip6_dst_ops_template = {
196 .family = AF_INET6,
197 .protocol = cpu_to_be16(ETH_P_IPV6),
198 .gc = ip6_dst_gc,
199 .gc_thresh = 1024,
200 .check = ip6_dst_check,
201 .default_advmss = ip6_default_advmss,
202 .mtu = ip6_mtu,
203 .cow_metrics = ipv6_cow_metrics,
204 .destroy = ip6_dst_destroy,
205 .ifdown = ip6_dst_ifdown,
206 .negative_advice = ip6_negative_advice,
207 .link_failure = ip6_link_failure,
208 .update_pmtu = ip6_rt_update_pmtu,
209 .redirect = rt6_do_redirect,
210 .local_out = __ip6_local_out,
211 .neigh_lookup = ip6_neigh_lookup,
212 };
213
214 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
215 {
216 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
217
218 return mtu ? : dst->dev->mtu;
219 }
220
221 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
222 struct sk_buff *skb, u32 mtu)
223 {
224 }
225
226 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
227 struct sk_buff *skb)
228 {
229 }
230
231 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
232 unsigned long old)
233 {
234 return NULL;
235 }
236
237 static struct dst_ops ip6_dst_blackhole_ops = {
238 .family = AF_INET6,
239 .protocol = cpu_to_be16(ETH_P_IPV6),
240 .destroy = ip6_dst_destroy,
241 .check = ip6_dst_check,
242 .mtu = ip6_blackhole_mtu,
243 .default_advmss = ip6_default_advmss,
244 .update_pmtu = ip6_rt_blackhole_update_pmtu,
245 .redirect = ip6_rt_blackhole_redirect,
246 .cow_metrics = ip6_rt_blackhole_cow_metrics,
247 .neigh_lookup = ip6_neigh_lookup,
248 };
249
250 static const u32 ip6_template_metrics[RTAX_MAX] = {
251 [RTAX_HOPLIMIT - 1] = 0,
252 };
253
254 static const struct rt6_info ip6_null_entry_template = {
255 .dst = {
256 .__refcnt = ATOMIC_INIT(1),
257 .__use = 1,
258 .obsolete = DST_OBSOLETE_FORCE_CHK,
259 .error = -ENETUNREACH,
260 .input = ip6_pkt_discard,
261 .output = ip6_pkt_discard_out,
262 },
263 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
264 .rt6i_protocol = RTPROT_KERNEL,
265 .rt6i_metric = ~(u32) 0,
266 .rt6i_ref = ATOMIC_INIT(1),
267 };
268
269 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
270
271 static const struct rt6_info ip6_prohibit_entry_template = {
272 .dst = {
273 .__refcnt = ATOMIC_INIT(1),
274 .__use = 1,
275 .obsolete = DST_OBSOLETE_FORCE_CHK,
276 .error = -EACCES,
277 .input = ip6_pkt_prohibit,
278 .output = ip6_pkt_prohibit_out,
279 },
280 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
281 .rt6i_protocol = RTPROT_KERNEL,
282 .rt6i_metric = ~(u32) 0,
283 .rt6i_ref = ATOMIC_INIT(1),
284 };
285
286 static const struct rt6_info ip6_blk_hole_entry_template = {
287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
290 .obsolete = DST_OBSOLETE_FORCE_CHK,
291 .error = -EINVAL,
292 .input = dst_discard,
293 .output = dst_discard_sk,
294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
296 .rt6i_protocol = RTPROT_KERNEL,
297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299 };
300
301 #endif
302
303 /* allocate dst with ip6_dst_ops */
304 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
305 struct net_device *dev,
306 int flags,
307 struct fib6_table *table)
308 {
309 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
310 0, DST_OBSOLETE_FORCE_CHK, flags);
311
312 if (rt) {
313 struct dst_entry *dst = &rt->dst;
314
315 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
316 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
317 INIT_LIST_HEAD(&rt->rt6i_siblings);
318 }
319 return rt;
320 }
321
322 static void ip6_dst_destroy(struct dst_entry *dst)
323 {
324 struct rt6_info *rt = (struct rt6_info *)dst;
325 struct inet6_dev *idev = rt->rt6i_idev;
326 struct dst_entry *from = dst->from;
327
328 if (!(rt->dst.flags & DST_HOST))
329 dst_destroy_metrics_generic(dst);
330
331 if (idev) {
332 rt->rt6i_idev = NULL;
333 in6_dev_put(idev);
334 }
335
336 dst->from = NULL;
337 dst_release(from);
338
339 if (rt6_has_peer(rt)) {
340 struct inet_peer *peer = rt6_peer_ptr(rt);
341 inet_putpeer(peer);
342 }
343 }
344
345 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
346 int how)
347 {
348 struct rt6_info *rt = (struct rt6_info *)dst;
349 struct inet6_dev *idev = rt->rt6i_idev;
350 struct net_device *loopback_dev =
351 dev_net(dev)->loopback_dev;
352
353 if (dev != loopback_dev) {
354 if (idev && idev->dev == dev) {
355 struct inet6_dev *loopback_idev =
356 in6_dev_get(loopback_dev);
357 if (loopback_idev) {
358 rt->rt6i_idev = loopback_idev;
359 in6_dev_put(idev);
360 }
361 }
362 }
363 }
364
365 static bool rt6_check_expired(const struct rt6_info *rt)
366 {
367 if (rt->rt6i_flags & RTF_EXPIRES) {
368 if (time_after(jiffies, rt->dst.expires))
369 return true;
370 } else if (rt->dst.from) {
371 return rt6_check_expired((struct rt6_info *) rt->dst.from);
372 }
373 return false;
374 }
375
376 /* Multipath route selection:
377 * Hash based function using packet header and flowlabel.
378 * Adapted from fib_info_hashfn()
379 */
380 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
381 const struct flowi6 *fl6)
382 {
383 unsigned int val = fl6->flowi6_proto;
384
385 val ^= ipv6_addr_hash(&fl6->daddr);
386 val ^= ipv6_addr_hash(&fl6->saddr);
387
388 /* Work only if this not encapsulated */
389 switch (fl6->flowi6_proto) {
390 case IPPROTO_UDP:
391 case IPPROTO_TCP:
392 case IPPROTO_SCTP:
393 val ^= (__force u16)fl6->fl6_sport;
394 val ^= (__force u16)fl6->fl6_dport;
395 break;
396
397 case IPPROTO_ICMPV6:
398 val ^= (__force u16)fl6->fl6_icmp_type;
399 val ^= (__force u16)fl6->fl6_icmp_code;
400 break;
401 }
402 /* RFC6438 recommands to use flowlabel */
403 val ^= (__force u32)fl6->flowlabel;
404
405 /* Perhaps, we need to tune, this function? */
406 val = val ^ (val >> 7) ^ (val >> 12);
407 return val % candidate_count;
408 }
409
410 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
411 struct flowi6 *fl6, int oif,
412 int strict)
413 {
414 struct rt6_info *sibling, *next_sibling;
415 int route_choosen;
416
417 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
418 /* Don't change the route, if route_choosen == 0
419 * (siblings does not include ourself)
420 */
421 if (route_choosen)
422 list_for_each_entry_safe(sibling, next_sibling,
423 &match->rt6i_siblings, rt6i_siblings) {
424 route_choosen--;
425 if (route_choosen == 0) {
426 if (rt6_score_route(sibling, oif, strict) < 0)
427 break;
428 match = sibling;
429 break;
430 }
431 }
432 return match;
433 }
434
435 /*
436 * Route lookup. Any table->tb6_lock is implied.
437 */
438
439 static inline struct rt6_info *rt6_device_match(struct net *net,
440 struct rt6_info *rt,
441 const struct in6_addr *saddr,
442 int oif,
443 int flags)
444 {
445 struct rt6_info *local = NULL;
446 struct rt6_info *sprt;
447
448 if (!oif && ipv6_addr_any(saddr))
449 goto out;
450
451 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
452 struct net_device *dev = sprt->dst.dev;
453
454 if (oif) {
455 if (dev->ifindex == oif)
456 return sprt;
457 if (dev->flags & IFF_LOOPBACK) {
458 if (!sprt->rt6i_idev ||
459 sprt->rt6i_idev->dev->ifindex != oif) {
460 if (flags & RT6_LOOKUP_F_IFACE && oif)
461 continue;
462 if (local && (!oif ||
463 local->rt6i_idev->dev->ifindex == oif))
464 continue;
465 }
466 local = sprt;
467 }
468 } else {
469 if (ipv6_chk_addr(net, saddr, dev,
470 flags & RT6_LOOKUP_F_IFACE))
471 return sprt;
472 }
473 }
474
475 if (oif) {
476 if (local)
477 return local;
478
479 if (flags & RT6_LOOKUP_F_IFACE)
480 return net->ipv6.ip6_null_entry;
481 }
482 out:
483 return rt;
484 }
485
486 #ifdef CONFIG_IPV6_ROUTER_PREF
487 struct __rt6_probe_work {
488 struct work_struct work;
489 struct in6_addr target;
490 struct net_device *dev;
491 };
492
493 static void rt6_probe_deferred(struct work_struct *w)
494 {
495 struct in6_addr mcaddr;
496 struct __rt6_probe_work *work =
497 container_of(w, struct __rt6_probe_work, work);
498
499 addrconf_addr_solict_mult(&work->target, &mcaddr);
500 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
501 dev_put(work->dev);
502 kfree(w);
503 }
504
505 static void rt6_probe(struct rt6_info *rt)
506 {
507 struct neighbour *neigh;
508 /*
509 * Okay, this does not seem to be appropriate
510 * for now, however, we need to check if it
511 * is really so; aka Router Reachability Probing.
512 *
513 * Router Reachability Probe MUST be rate-limited
514 * to no more than one per minute.
515 */
516 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
517 return;
518 rcu_read_lock_bh();
519 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
520 if (neigh) {
521 write_lock(&neigh->lock);
522 if (neigh->nud_state & NUD_VALID)
523 goto out;
524 }
525
526 if (!neigh ||
527 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
528 struct __rt6_probe_work *work;
529
530 work = kmalloc(sizeof(*work), GFP_ATOMIC);
531
532 if (neigh && work)
533 __neigh_set_probe_once(neigh);
534
535 if (neigh)
536 write_unlock(&neigh->lock);
537
538 if (work) {
539 INIT_WORK(&work->work, rt6_probe_deferred);
540 work->target = rt->rt6i_gateway;
541 dev_hold(rt->dst.dev);
542 work->dev = rt->dst.dev;
543 schedule_work(&work->work);
544 }
545 } else {
546 out:
547 write_unlock(&neigh->lock);
548 }
549 rcu_read_unlock_bh();
550 }
551 #else
552 static inline void rt6_probe(struct rt6_info *rt)
553 {
554 }
555 #endif
556
557 /*
558 * Default Router Selection (RFC 2461 6.3.6)
559 */
560 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
561 {
562 struct net_device *dev = rt->dst.dev;
563 if (!oif || dev->ifindex == oif)
564 return 2;
565 if ((dev->flags & IFF_LOOPBACK) &&
566 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
567 return 1;
568 return 0;
569 }
570
571 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
572 {
573 struct neighbour *neigh;
574 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
575
576 if (rt->rt6i_flags & RTF_NONEXTHOP ||
577 !(rt->rt6i_flags & RTF_GATEWAY))
578 return RT6_NUD_SUCCEED;
579
580 rcu_read_lock_bh();
581 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
582 if (neigh) {
583 read_lock(&neigh->lock);
584 if (neigh->nud_state & NUD_VALID)
585 ret = RT6_NUD_SUCCEED;
586 #ifdef CONFIG_IPV6_ROUTER_PREF
587 else if (!(neigh->nud_state & NUD_FAILED))
588 ret = RT6_NUD_SUCCEED;
589 else
590 ret = RT6_NUD_FAIL_PROBE;
591 #endif
592 read_unlock(&neigh->lock);
593 } else {
594 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
595 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
596 }
597 rcu_read_unlock_bh();
598
599 return ret;
600 }
601
602 static int rt6_score_route(struct rt6_info *rt, int oif,
603 int strict)
604 {
605 int m;
606
607 m = rt6_check_dev(rt, oif);
608 if (!m && (strict & RT6_LOOKUP_F_IFACE))
609 return RT6_NUD_FAIL_HARD;
610 #ifdef CONFIG_IPV6_ROUTER_PREF
611 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
612 #endif
613 if (strict & RT6_LOOKUP_F_REACHABLE) {
614 int n = rt6_check_neigh(rt);
615 if (n < 0)
616 return n;
617 }
618 return m;
619 }
620
621 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
622 int *mpri, struct rt6_info *match,
623 bool *do_rr)
624 {
625 int m;
626 bool match_do_rr = false;
627
628 if (rt6_check_expired(rt))
629 goto out;
630
631 m = rt6_score_route(rt, oif, strict);
632 if (m == RT6_NUD_FAIL_DO_RR) {
633 match_do_rr = true;
634 m = 0; /* lowest valid score */
635 } else if (m == RT6_NUD_FAIL_HARD) {
636 goto out;
637 }
638
639 if (strict & RT6_LOOKUP_F_REACHABLE)
640 rt6_probe(rt);
641
642 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
643 if (m > *mpri) {
644 *do_rr = match_do_rr;
645 *mpri = m;
646 match = rt;
647 }
648 out:
649 return match;
650 }
651
652 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
653 struct rt6_info *rr_head,
654 u32 metric, int oif, int strict,
655 bool *do_rr)
656 {
657 struct rt6_info *rt, *match;
658 int mpri = -1;
659
660 match = NULL;
661 for (rt = rr_head; rt && rt->rt6i_metric == metric;
662 rt = rt->dst.rt6_next)
663 match = find_match(rt, oif, strict, &mpri, match, do_rr);
664 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
665 rt = rt->dst.rt6_next)
666 match = find_match(rt, oif, strict, &mpri, match, do_rr);
667
668 return match;
669 }
670
671 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
672 {
673 struct rt6_info *match, *rt0;
674 struct net *net;
675 bool do_rr = false;
676
677 rt0 = fn->rr_ptr;
678 if (!rt0)
679 fn->rr_ptr = rt0 = fn->leaf;
680
681 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
682 &do_rr);
683
684 if (do_rr) {
685 struct rt6_info *next = rt0->dst.rt6_next;
686
687 /* no entries matched; do round-robin */
688 if (!next || next->rt6i_metric != rt0->rt6i_metric)
689 next = fn->leaf;
690
691 if (next != rt0)
692 fn->rr_ptr = next;
693 }
694
695 net = dev_net(rt0->dst.dev);
696 return match ? match : net->ipv6.ip6_null_entry;
697 }
698
699 #ifdef CONFIG_IPV6_ROUTE_INFO
700 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
701 const struct in6_addr *gwaddr)
702 {
703 struct net *net = dev_net(dev);
704 struct route_info *rinfo = (struct route_info *) opt;
705 struct in6_addr prefix_buf, *prefix;
706 unsigned int pref;
707 unsigned long lifetime;
708 struct rt6_info *rt;
709
710 if (len < sizeof(struct route_info)) {
711 return -EINVAL;
712 }
713
714 /* Sanity check for prefix_len and length */
715 if (rinfo->length > 3) {
716 return -EINVAL;
717 } else if (rinfo->prefix_len > 128) {
718 return -EINVAL;
719 } else if (rinfo->prefix_len > 64) {
720 if (rinfo->length < 2) {
721 return -EINVAL;
722 }
723 } else if (rinfo->prefix_len > 0) {
724 if (rinfo->length < 1) {
725 return -EINVAL;
726 }
727 }
728
729 pref = rinfo->route_pref;
730 if (pref == ICMPV6_ROUTER_PREF_INVALID)
731 return -EINVAL;
732
733 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
734
735 if (rinfo->length == 3)
736 prefix = (struct in6_addr *)rinfo->prefix;
737 else {
738 /* this function is safe */
739 ipv6_addr_prefix(&prefix_buf,
740 (struct in6_addr *)rinfo->prefix,
741 rinfo->prefix_len);
742 prefix = &prefix_buf;
743 }
744
745 if (rinfo->prefix_len == 0)
746 rt = rt6_get_dflt_router(gwaddr, dev);
747 else
748 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
749 gwaddr, dev->ifindex);
750
751 if (rt && !lifetime) {
752 ip6_del_rt(rt);
753 rt = NULL;
754 }
755
756 if (!rt && lifetime)
757 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
758 pref);
759 else if (rt)
760 rt->rt6i_flags = RTF_ROUTEINFO |
761 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
762
763 if (rt) {
764 if (!addrconf_finite_timeout(lifetime))
765 rt6_clean_expires(rt);
766 else
767 rt6_set_expires(rt, jiffies + HZ * lifetime);
768
769 ip6_rt_put(rt);
770 }
771 return 0;
772 }
773 #endif
774
775 #define BACKTRACK(__net, saddr) \
776 do { \
777 if (rt == __net->ipv6.ip6_null_entry) { \
778 struct fib6_node *pn; \
779 while (1) { \
780 if (fn->fn_flags & RTN_TL_ROOT) \
781 goto out; \
782 pn = fn->parent; \
783 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
784 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
785 else \
786 fn = pn; \
787 if (fn->fn_flags & RTN_RTINFO) \
788 goto restart; \
789 } \
790 } \
791 } while (0)
792
793 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
794 struct fib6_table *table,
795 struct flowi6 *fl6, int flags)
796 {
797 struct fib6_node *fn;
798 struct rt6_info *rt;
799
800 read_lock_bh(&table->tb6_lock);
801 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
802 restart:
803 rt = fn->leaf;
804 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
805 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
806 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
807 BACKTRACK(net, &fl6->saddr);
808 out:
809 dst_use(&rt->dst, jiffies);
810 read_unlock_bh(&table->tb6_lock);
811 return rt;
812
813 }
814
815 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
816 int flags)
817 {
818 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
819 }
820 EXPORT_SYMBOL_GPL(ip6_route_lookup);
821
822 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
823 const struct in6_addr *saddr, int oif, int strict)
824 {
825 struct flowi6 fl6 = {
826 .flowi6_oif = oif,
827 .daddr = *daddr,
828 };
829 struct dst_entry *dst;
830 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
831
832 if (saddr) {
833 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
834 flags |= RT6_LOOKUP_F_HAS_SADDR;
835 }
836
837 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
838 if (dst->error == 0)
839 return (struct rt6_info *) dst;
840
841 dst_release(dst);
842
843 return NULL;
844 }
845
846 EXPORT_SYMBOL(rt6_lookup);
847
848 /* ip6_ins_rt is called with FREE table->tb6_lock.
849 It takes new route entry, the addition fails by any reason the
850 route is freed. In any case, if caller does not hold it, it may
851 be destroyed.
852 */
853
854 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
855 struct nlattr *mx, int mx_len)
856 {
857 int err;
858 struct fib6_table *table;
859
860 table = rt->rt6i_table;
861 write_lock_bh(&table->tb6_lock);
862 err = fib6_add(&table->tb6_root, rt, info, mx, mx_len);
863 write_unlock_bh(&table->tb6_lock);
864
865 return err;
866 }
867
868 int ip6_ins_rt(struct rt6_info *rt)
869 {
870 struct nl_info info = {
871 .nl_net = dev_net(rt->dst.dev),
872 };
873 return __ip6_ins_rt(rt, &info, NULL, 0);
874 }
875
876 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
877 const struct in6_addr *daddr,
878 const struct in6_addr *saddr)
879 {
880 struct rt6_info *rt;
881
882 /*
883 * Clone the route.
884 */
885
886 rt = ip6_rt_copy(ort, daddr);
887
888 if (rt) {
889 if (ort->rt6i_dst.plen != 128 &&
890 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
891 rt->rt6i_flags |= RTF_ANYCAST;
892
893 rt->rt6i_flags |= RTF_CACHE;
894
895 #ifdef CONFIG_IPV6_SUBTREES
896 if (rt->rt6i_src.plen && saddr) {
897 rt->rt6i_src.addr = *saddr;
898 rt->rt6i_src.plen = 128;
899 }
900 #endif
901 }
902
903 return rt;
904 }
905
906 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
907 const struct in6_addr *daddr)
908 {
909 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
910
911 if (rt)
912 rt->rt6i_flags |= RTF_CACHE;
913 return rt;
914 }
915
916 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
917 struct flowi6 *fl6, int flags)
918 {
919 struct fib6_node *fn;
920 struct rt6_info *rt, *nrt;
921 int strict = 0;
922 int attempts = 3;
923 int err;
924 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
925
926 strict |= flags & RT6_LOOKUP_F_IFACE;
927
928 relookup:
929 read_lock_bh(&table->tb6_lock);
930
931 restart_2:
932 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
933
934 restart:
935 rt = rt6_select(fn, oif, strict | reachable);
936 if (rt->rt6i_nsiblings)
937 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
938 BACKTRACK(net, &fl6->saddr);
939 if (rt == net->ipv6.ip6_null_entry ||
940 rt->rt6i_flags & RTF_CACHE)
941 goto out;
942
943 dst_hold(&rt->dst);
944 read_unlock_bh(&table->tb6_lock);
945
946 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
947 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
948 else if (!(rt->dst.flags & DST_HOST))
949 nrt = rt6_alloc_clone(rt, &fl6->daddr);
950 else
951 goto out2;
952
953 ip6_rt_put(rt);
954 rt = nrt ? : net->ipv6.ip6_null_entry;
955
956 dst_hold(&rt->dst);
957 if (nrt) {
958 err = ip6_ins_rt(nrt);
959 if (!err)
960 goto out2;
961 }
962
963 if (--attempts <= 0)
964 goto out2;
965
966 /*
967 * Race condition! In the gap, when table->tb6_lock was
968 * released someone could insert this route. Relookup.
969 */
970 ip6_rt_put(rt);
971 goto relookup;
972
973 out:
974 if (reachable) {
975 reachable = 0;
976 goto restart_2;
977 }
978 dst_hold(&rt->dst);
979 read_unlock_bh(&table->tb6_lock);
980 out2:
981 rt->dst.lastuse = jiffies;
982 rt->dst.__use++;
983
984 return rt;
985 }
986
987 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
988 struct flowi6 *fl6, int flags)
989 {
990 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
991 }
992
993 static struct dst_entry *ip6_route_input_lookup(struct net *net,
994 struct net_device *dev,
995 struct flowi6 *fl6, int flags)
996 {
997 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
998 flags |= RT6_LOOKUP_F_IFACE;
999
1000 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1001 }
1002
1003 void ip6_route_input(struct sk_buff *skb)
1004 {
1005 const struct ipv6hdr *iph = ipv6_hdr(skb);
1006 struct net *net = dev_net(skb->dev);
1007 int flags = RT6_LOOKUP_F_HAS_SADDR;
1008 struct flowi6 fl6 = {
1009 .flowi6_iif = skb->dev->ifindex,
1010 .daddr = iph->daddr,
1011 .saddr = iph->saddr,
1012 .flowlabel = ip6_flowinfo(iph),
1013 .flowi6_mark = skb->mark,
1014 .flowi6_proto = iph->nexthdr,
1015 };
1016
1017 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1018 }
1019
1020 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1021 struct flowi6 *fl6, int flags)
1022 {
1023 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1024 }
1025
1026 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1027 struct flowi6 *fl6)
1028 {
1029 int flags = 0;
1030
1031 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1032
1033 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1034 flags |= RT6_LOOKUP_F_IFACE;
1035
1036 if (!ipv6_addr_any(&fl6->saddr))
1037 flags |= RT6_LOOKUP_F_HAS_SADDR;
1038 else if (sk)
1039 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1040
1041 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1042 }
1043
1044 EXPORT_SYMBOL(ip6_route_output);
1045
1046 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1047 {
1048 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1049 struct dst_entry *new = NULL;
1050
1051 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1052 if (rt) {
1053 new = &rt->dst;
1054
1055 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1056 rt6_init_peer(rt, net->ipv6.peers);
1057
1058 new->__use = 1;
1059 new->input = dst_discard;
1060 new->output = dst_discard_sk;
1061
1062 if (dst_metrics_read_only(&ort->dst))
1063 new->_metrics = ort->dst._metrics;
1064 else
1065 dst_copy_metrics(new, &ort->dst);
1066 rt->rt6i_idev = ort->rt6i_idev;
1067 if (rt->rt6i_idev)
1068 in6_dev_hold(rt->rt6i_idev);
1069
1070 rt->rt6i_gateway = ort->rt6i_gateway;
1071 rt->rt6i_flags = ort->rt6i_flags;
1072 rt->rt6i_metric = 0;
1073
1074 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1075 #ifdef CONFIG_IPV6_SUBTREES
1076 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1077 #endif
1078
1079 dst_free(new);
1080 }
1081
1082 dst_release(dst_orig);
1083 return new ? new : ERR_PTR(-ENOMEM);
1084 }
1085
1086 /*
1087 * Destination cache support functions
1088 */
1089
1090 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1091 {
1092 struct rt6_info *rt;
1093
1094 rt = (struct rt6_info *) dst;
1095
1096 /* All IPV6 dsts are created with ->obsolete set to the value
1097 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1098 * into this function always.
1099 */
1100 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1101 return NULL;
1102
1103 if (rt6_check_expired(rt))
1104 return NULL;
1105
1106 return dst;
1107 }
1108
1109 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1110 {
1111 struct rt6_info *rt = (struct rt6_info *) dst;
1112
1113 if (rt) {
1114 if (rt->rt6i_flags & RTF_CACHE) {
1115 if (rt6_check_expired(rt)) {
1116 ip6_del_rt(rt);
1117 dst = NULL;
1118 }
1119 } else {
1120 dst_release(dst);
1121 dst = NULL;
1122 }
1123 }
1124 return dst;
1125 }
1126
1127 static void ip6_link_failure(struct sk_buff *skb)
1128 {
1129 struct rt6_info *rt;
1130
1131 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1132
1133 rt = (struct rt6_info *) skb_dst(skb);
1134 if (rt) {
1135 if (rt->rt6i_flags & RTF_CACHE) {
1136 dst_hold(&rt->dst);
1137 if (ip6_del_rt(rt))
1138 dst_free(&rt->dst);
1139 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1140 rt->rt6i_node->fn_sernum = -1;
1141 }
1142 }
1143 }
1144
1145 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1146 struct sk_buff *skb, u32 mtu)
1147 {
1148 struct rt6_info *rt6 = (struct rt6_info*)dst;
1149
1150 dst_confirm(dst);
1151 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1152 struct net *net = dev_net(dst->dev);
1153
1154 rt6->rt6i_flags |= RTF_MODIFIED;
1155 if (mtu < IPV6_MIN_MTU) {
1156 u32 features = dst_metric(dst, RTAX_FEATURES);
1157 mtu = IPV6_MIN_MTU;
1158 features |= RTAX_FEATURE_ALLFRAG;
1159 dst_metric_set(dst, RTAX_FEATURES, features);
1160 }
1161 dst_metric_set(dst, RTAX_MTU, mtu);
1162 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1163 }
1164 }
1165
1166 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1167 int oif, u32 mark)
1168 {
1169 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1170 struct dst_entry *dst;
1171 struct flowi6 fl6;
1172
1173 memset(&fl6, 0, sizeof(fl6));
1174 fl6.flowi6_oif = oif;
1175 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1176 fl6.daddr = iph->daddr;
1177 fl6.saddr = iph->saddr;
1178 fl6.flowlabel = ip6_flowinfo(iph);
1179
1180 dst = ip6_route_output(net, NULL, &fl6);
1181 if (!dst->error)
1182 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1183 dst_release(dst);
1184 }
1185 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1186
1187 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1188 {
1189 ip6_update_pmtu(skb, sock_net(sk), mtu,
1190 sk->sk_bound_dev_if, sk->sk_mark);
1191 }
1192 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1193
1194 /* Handle redirects */
1195 struct ip6rd_flowi {
1196 struct flowi6 fl6;
1197 struct in6_addr gateway;
1198 };
1199
1200 static struct rt6_info *__ip6_route_redirect(struct net *net,
1201 struct fib6_table *table,
1202 struct flowi6 *fl6,
1203 int flags)
1204 {
1205 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1206 struct rt6_info *rt;
1207 struct fib6_node *fn;
1208
1209 /* Get the "current" route for this destination and
1210 * check if the redirect has come from approriate router.
1211 *
1212 * RFC 4861 specifies that redirects should only be
1213 * accepted if they come from the nexthop to the target.
1214 * Due to the way the routes are chosen, this notion
1215 * is a bit fuzzy and one might need to check all possible
1216 * routes.
1217 */
1218
1219 read_lock_bh(&table->tb6_lock);
1220 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1221 restart:
1222 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1223 if (rt6_check_expired(rt))
1224 continue;
1225 if (rt->dst.error)
1226 break;
1227 if (!(rt->rt6i_flags & RTF_GATEWAY))
1228 continue;
1229 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1230 continue;
1231 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1232 continue;
1233 break;
1234 }
1235
1236 if (!rt)
1237 rt = net->ipv6.ip6_null_entry;
1238 else if (rt->dst.error) {
1239 rt = net->ipv6.ip6_null_entry;
1240 goto out;
1241 }
1242 BACKTRACK(net, &fl6->saddr);
1243 out:
1244 dst_hold(&rt->dst);
1245
1246 read_unlock_bh(&table->tb6_lock);
1247
1248 return rt;
1249 };
1250
1251 static struct dst_entry *ip6_route_redirect(struct net *net,
1252 const struct flowi6 *fl6,
1253 const struct in6_addr *gateway)
1254 {
1255 int flags = RT6_LOOKUP_F_HAS_SADDR;
1256 struct ip6rd_flowi rdfl;
1257
1258 rdfl.fl6 = *fl6;
1259 rdfl.gateway = *gateway;
1260
1261 return fib6_rule_lookup(net, &rdfl.fl6,
1262 flags, __ip6_route_redirect);
1263 }
1264
1265 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1266 {
1267 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1268 struct dst_entry *dst;
1269 struct flowi6 fl6;
1270
1271 memset(&fl6, 0, sizeof(fl6));
1272 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1273 fl6.flowi6_oif = oif;
1274 fl6.flowi6_mark = mark;
1275 fl6.daddr = iph->daddr;
1276 fl6.saddr = iph->saddr;
1277 fl6.flowlabel = ip6_flowinfo(iph);
1278
1279 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1280 rt6_do_redirect(dst, NULL, skb);
1281 dst_release(dst);
1282 }
1283 EXPORT_SYMBOL_GPL(ip6_redirect);
1284
1285 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1286 u32 mark)
1287 {
1288 const struct ipv6hdr *iph = ipv6_hdr(skb);
1289 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1290 struct dst_entry *dst;
1291 struct flowi6 fl6;
1292
1293 memset(&fl6, 0, sizeof(fl6));
1294 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1295 fl6.flowi6_oif = oif;
1296 fl6.flowi6_mark = mark;
1297 fl6.daddr = msg->dest;
1298 fl6.saddr = iph->daddr;
1299
1300 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1301 rt6_do_redirect(dst, NULL, skb);
1302 dst_release(dst);
1303 }
1304
1305 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1306 {
1307 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1308 }
1309 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1310
1311 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1312 {
1313 struct net_device *dev = dst->dev;
1314 unsigned int mtu = dst_mtu(dst);
1315 struct net *net = dev_net(dev);
1316
1317 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1318
1319 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1320 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1321
1322 /*
1323 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1324 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1325 * IPV6_MAXPLEN is also valid and means: "any MSS,
1326 * rely only on pmtu discovery"
1327 */
1328 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1329 mtu = IPV6_MAXPLEN;
1330 return mtu;
1331 }
1332
1333 static unsigned int ip6_mtu(const struct dst_entry *dst)
1334 {
1335 struct inet6_dev *idev;
1336 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1337
1338 if (mtu)
1339 goto out;
1340
1341 mtu = IPV6_MIN_MTU;
1342
1343 rcu_read_lock();
1344 idev = __in6_dev_get(dst->dev);
1345 if (idev)
1346 mtu = idev->cnf.mtu6;
1347 rcu_read_unlock();
1348
1349 out:
1350 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1351 }
1352
1353 static struct dst_entry *icmp6_dst_gc_list;
1354 static DEFINE_SPINLOCK(icmp6_dst_lock);
1355
1356 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1357 struct flowi6 *fl6)
1358 {
1359 struct dst_entry *dst;
1360 struct rt6_info *rt;
1361 struct inet6_dev *idev = in6_dev_get(dev);
1362 struct net *net = dev_net(dev);
1363
1364 if (unlikely(!idev))
1365 return ERR_PTR(-ENODEV);
1366
1367 rt = ip6_dst_alloc(net, dev, 0, NULL);
1368 if (unlikely(!rt)) {
1369 in6_dev_put(idev);
1370 dst = ERR_PTR(-ENOMEM);
1371 goto out;
1372 }
1373
1374 rt->dst.flags |= DST_HOST;
1375 rt->dst.output = ip6_output;
1376 atomic_set(&rt->dst.__refcnt, 1);
1377 rt->rt6i_gateway = fl6->daddr;
1378 rt->rt6i_dst.addr = fl6->daddr;
1379 rt->rt6i_dst.plen = 128;
1380 rt->rt6i_idev = idev;
1381 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1382
1383 spin_lock_bh(&icmp6_dst_lock);
1384 rt->dst.next = icmp6_dst_gc_list;
1385 icmp6_dst_gc_list = &rt->dst;
1386 spin_unlock_bh(&icmp6_dst_lock);
1387
1388 fib6_force_start_gc(net);
1389
1390 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1391
1392 out:
1393 return dst;
1394 }
1395
1396 int icmp6_dst_gc(void)
1397 {
1398 struct dst_entry *dst, **pprev;
1399 int more = 0;
1400
1401 spin_lock_bh(&icmp6_dst_lock);
1402 pprev = &icmp6_dst_gc_list;
1403
1404 while ((dst = *pprev) != NULL) {
1405 if (!atomic_read(&dst->__refcnt)) {
1406 *pprev = dst->next;
1407 dst_free(dst);
1408 } else {
1409 pprev = &dst->next;
1410 ++more;
1411 }
1412 }
1413
1414 spin_unlock_bh(&icmp6_dst_lock);
1415
1416 return more;
1417 }
1418
1419 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1420 void *arg)
1421 {
1422 struct dst_entry *dst, **pprev;
1423
1424 spin_lock_bh(&icmp6_dst_lock);
1425 pprev = &icmp6_dst_gc_list;
1426 while ((dst = *pprev) != NULL) {
1427 struct rt6_info *rt = (struct rt6_info *) dst;
1428 if (func(rt, arg)) {
1429 *pprev = dst->next;
1430 dst_free(dst);
1431 } else {
1432 pprev = &dst->next;
1433 }
1434 }
1435 spin_unlock_bh(&icmp6_dst_lock);
1436 }
1437
1438 static int ip6_dst_gc(struct dst_ops *ops)
1439 {
1440 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1441 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1442 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1443 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1444 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1445 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1446 int entries;
1447
1448 entries = dst_entries_get_fast(ops);
1449 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1450 entries <= rt_max_size)
1451 goto out;
1452
1453 net->ipv6.ip6_rt_gc_expire++;
1454 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1455 entries = dst_entries_get_slow(ops);
1456 if (entries < ops->gc_thresh)
1457 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1458 out:
1459 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1460 return entries > rt_max_size;
1461 }
1462
1463 /*
1464 *
1465 */
1466
1467 int ip6_route_add(struct fib6_config *cfg)
1468 {
1469 int err;
1470 struct net *net = cfg->fc_nlinfo.nl_net;
1471 struct rt6_info *rt = NULL;
1472 struct net_device *dev = NULL;
1473 struct inet6_dev *idev = NULL;
1474 struct fib6_table *table;
1475 int addr_type;
1476
1477 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1478 return -EINVAL;
1479 #ifndef CONFIG_IPV6_SUBTREES
1480 if (cfg->fc_src_len)
1481 return -EINVAL;
1482 #endif
1483 if (cfg->fc_ifindex) {
1484 err = -ENODEV;
1485 dev = dev_get_by_index(net, cfg->fc_ifindex);
1486 if (!dev)
1487 goto out;
1488 idev = in6_dev_get(dev);
1489 if (!idev)
1490 goto out;
1491 }
1492
1493 if (cfg->fc_metric == 0)
1494 cfg->fc_metric = IP6_RT_PRIO_USER;
1495
1496 err = -ENOBUFS;
1497 if (cfg->fc_nlinfo.nlh &&
1498 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1499 table = fib6_get_table(net, cfg->fc_table);
1500 if (!table) {
1501 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1502 table = fib6_new_table(net, cfg->fc_table);
1503 }
1504 } else {
1505 table = fib6_new_table(net, cfg->fc_table);
1506 }
1507
1508 if (!table)
1509 goto out;
1510
1511 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1512
1513 if (!rt) {
1514 err = -ENOMEM;
1515 goto out;
1516 }
1517
1518 if (cfg->fc_flags & RTF_EXPIRES)
1519 rt6_set_expires(rt, jiffies +
1520 clock_t_to_jiffies(cfg->fc_expires));
1521 else
1522 rt6_clean_expires(rt);
1523
1524 if (cfg->fc_protocol == RTPROT_UNSPEC)
1525 cfg->fc_protocol = RTPROT_BOOT;
1526 rt->rt6i_protocol = cfg->fc_protocol;
1527
1528 addr_type = ipv6_addr_type(&cfg->fc_dst);
1529
1530 if (addr_type & IPV6_ADDR_MULTICAST)
1531 rt->dst.input = ip6_mc_input;
1532 else if (cfg->fc_flags & RTF_LOCAL)
1533 rt->dst.input = ip6_input;
1534 else
1535 rt->dst.input = ip6_forward;
1536
1537 rt->dst.output = ip6_output;
1538
1539 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1540 rt->rt6i_dst.plen = cfg->fc_dst_len;
1541 if (rt->rt6i_dst.plen == 128) {
1542 rt->dst.flags |= DST_HOST;
1543 dst_metrics_set_force_overwrite(&rt->dst);
1544 }
1545
1546 #ifdef CONFIG_IPV6_SUBTREES
1547 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1548 rt->rt6i_src.plen = cfg->fc_src_len;
1549 #endif
1550
1551 rt->rt6i_metric = cfg->fc_metric;
1552
1553 /* We cannot add true routes via loopback here,
1554 they would result in kernel looping; promote them to reject routes
1555 */
1556 if ((cfg->fc_flags & RTF_REJECT) ||
1557 (dev && (dev->flags & IFF_LOOPBACK) &&
1558 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1559 !(cfg->fc_flags & RTF_LOCAL))) {
1560 /* hold loopback dev/idev if we haven't done so. */
1561 if (dev != net->loopback_dev) {
1562 if (dev) {
1563 dev_put(dev);
1564 in6_dev_put(idev);
1565 }
1566 dev = net->loopback_dev;
1567 dev_hold(dev);
1568 idev = in6_dev_get(dev);
1569 if (!idev) {
1570 err = -ENODEV;
1571 goto out;
1572 }
1573 }
1574 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1575 switch (cfg->fc_type) {
1576 case RTN_BLACKHOLE:
1577 rt->dst.error = -EINVAL;
1578 rt->dst.output = dst_discard_sk;
1579 rt->dst.input = dst_discard;
1580 break;
1581 case RTN_PROHIBIT:
1582 rt->dst.error = -EACCES;
1583 rt->dst.output = ip6_pkt_prohibit_out;
1584 rt->dst.input = ip6_pkt_prohibit;
1585 break;
1586 case RTN_THROW:
1587 default:
1588 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1589 : -ENETUNREACH;
1590 rt->dst.output = ip6_pkt_discard_out;
1591 rt->dst.input = ip6_pkt_discard;
1592 break;
1593 }
1594 goto install_route;
1595 }
1596
1597 if (cfg->fc_flags & RTF_GATEWAY) {
1598 const struct in6_addr *gw_addr;
1599 int gwa_type;
1600
1601 gw_addr = &cfg->fc_gateway;
1602 rt->rt6i_gateway = *gw_addr;
1603 gwa_type = ipv6_addr_type(gw_addr);
1604
1605 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1606 struct rt6_info *grt;
1607
1608 /* IPv6 strictly inhibits using not link-local
1609 addresses as nexthop address.
1610 Otherwise, router will not able to send redirects.
1611 It is very good, but in some (rare!) circumstances
1612 (SIT, PtP, NBMA NOARP links) it is handy to allow
1613 some exceptions. --ANK
1614 */
1615 err = -EINVAL;
1616 if (!(gwa_type & IPV6_ADDR_UNICAST))
1617 goto out;
1618
1619 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1620
1621 err = -EHOSTUNREACH;
1622 if (!grt)
1623 goto out;
1624 if (dev) {
1625 if (dev != grt->dst.dev) {
1626 ip6_rt_put(grt);
1627 goto out;
1628 }
1629 } else {
1630 dev = grt->dst.dev;
1631 idev = grt->rt6i_idev;
1632 dev_hold(dev);
1633 in6_dev_hold(grt->rt6i_idev);
1634 }
1635 if (!(grt->rt6i_flags & RTF_GATEWAY))
1636 err = 0;
1637 ip6_rt_put(grt);
1638
1639 if (err)
1640 goto out;
1641 }
1642 err = -EINVAL;
1643 if (!dev || (dev->flags & IFF_LOOPBACK))
1644 goto out;
1645 }
1646
1647 err = -ENODEV;
1648 if (!dev)
1649 goto out;
1650
1651 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1652 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1653 err = -EINVAL;
1654 goto out;
1655 }
1656 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1657 rt->rt6i_prefsrc.plen = 128;
1658 } else
1659 rt->rt6i_prefsrc.plen = 0;
1660
1661 rt->rt6i_flags = cfg->fc_flags;
1662
1663 install_route:
1664 rt->dst.dev = dev;
1665 rt->rt6i_idev = idev;
1666 rt->rt6i_table = table;
1667
1668 cfg->fc_nlinfo.nl_net = dev_net(dev);
1669
1670 return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
1671
1672 out:
1673 if (dev)
1674 dev_put(dev);
1675 if (idev)
1676 in6_dev_put(idev);
1677 if (rt)
1678 dst_free(&rt->dst);
1679 return err;
1680 }
1681
1682 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1683 {
1684 int err;
1685 struct fib6_table *table;
1686 struct net *net = dev_net(rt->dst.dev);
1687
1688 if (rt == net->ipv6.ip6_null_entry) {
1689 err = -ENOENT;
1690 goto out;
1691 }
1692
1693 table = rt->rt6i_table;
1694 write_lock_bh(&table->tb6_lock);
1695 err = fib6_del(rt, info);
1696 write_unlock_bh(&table->tb6_lock);
1697
1698 out:
1699 ip6_rt_put(rt);
1700 return err;
1701 }
1702
1703 int ip6_del_rt(struct rt6_info *rt)
1704 {
1705 struct nl_info info = {
1706 .nl_net = dev_net(rt->dst.dev),
1707 };
1708 return __ip6_del_rt(rt, &info);
1709 }
1710
1711 static int ip6_route_del(struct fib6_config *cfg)
1712 {
1713 struct fib6_table *table;
1714 struct fib6_node *fn;
1715 struct rt6_info *rt;
1716 int err = -ESRCH;
1717
1718 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1719 if (!table)
1720 return err;
1721
1722 read_lock_bh(&table->tb6_lock);
1723
1724 fn = fib6_locate(&table->tb6_root,
1725 &cfg->fc_dst, cfg->fc_dst_len,
1726 &cfg->fc_src, cfg->fc_src_len);
1727
1728 if (fn) {
1729 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1730 if (cfg->fc_ifindex &&
1731 (!rt->dst.dev ||
1732 rt->dst.dev->ifindex != cfg->fc_ifindex))
1733 continue;
1734 if (cfg->fc_flags & RTF_GATEWAY &&
1735 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1736 continue;
1737 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1738 continue;
1739 dst_hold(&rt->dst);
1740 read_unlock_bh(&table->tb6_lock);
1741
1742 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1743 }
1744 }
1745 read_unlock_bh(&table->tb6_lock);
1746
1747 return err;
1748 }
1749
1750 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1751 {
1752 struct net *net = dev_net(skb->dev);
1753 struct netevent_redirect netevent;
1754 struct rt6_info *rt, *nrt = NULL;
1755 struct ndisc_options ndopts;
1756 struct inet6_dev *in6_dev;
1757 struct neighbour *neigh;
1758 struct rd_msg *msg;
1759 int optlen, on_link;
1760 u8 *lladdr;
1761
1762 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1763 optlen -= sizeof(*msg);
1764
1765 if (optlen < 0) {
1766 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1767 return;
1768 }
1769
1770 msg = (struct rd_msg *)icmp6_hdr(skb);
1771
1772 if (ipv6_addr_is_multicast(&msg->dest)) {
1773 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1774 return;
1775 }
1776
1777 on_link = 0;
1778 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1779 on_link = 1;
1780 } else if (ipv6_addr_type(&msg->target) !=
1781 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1782 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1783 return;
1784 }
1785
1786 in6_dev = __in6_dev_get(skb->dev);
1787 if (!in6_dev)
1788 return;
1789 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1790 return;
1791
1792 /* RFC2461 8.1:
1793 * The IP source address of the Redirect MUST be the same as the current
1794 * first-hop router for the specified ICMP Destination Address.
1795 */
1796
1797 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1798 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1799 return;
1800 }
1801
1802 lladdr = NULL;
1803 if (ndopts.nd_opts_tgt_lladdr) {
1804 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1805 skb->dev);
1806 if (!lladdr) {
1807 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1808 return;
1809 }
1810 }
1811
1812 rt = (struct rt6_info *) dst;
1813 if (rt == net->ipv6.ip6_null_entry) {
1814 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1815 return;
1816 }
1817
1818 /* Redirect received -> path was valid.
1819 * Look, redirects are sent only in response to data packets,
1820 * so that this nexthop apparently is reachable. --ANK
1821 */
1822 dst_confirm(&rt->dst);
1823
1824 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1825 if (!neigh)
1826 return;
1827
1828 /*
1829 * We have finally decided to accept it.
1830 */
1831
1832 neigh_update(neigh, lladdr, NUD_STALE,
1833 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1834 NEIGH_UPDATE_F_OVERRIDE|
1835 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1836 NEIGH_UPDATE_F_ISROUTER))
1837 );
1838
1839 nrt = ip6_rt_copy(rt, &msg->dest);
1840 if (!nrt)
1841 goto out;
1842
1843 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1844 if (on_link)
1845 nrt->rt6i_flags &= ~RTF_GATEWAY;
1846
1847 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1848
1849 if (ip6_ins_rt(nrt))
1850 goto out;
1851
1852 netevent.old = &rt->dst;
1853 netevent.new = &nrt->dst;
1854 netevent.daddr = &msg->dest;
1855 netevent.neigh = neigh;
1856 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1857
1858 if (rt->rt6i_flags & RTF_CACHE) {
1859 rt = (struct rt6_info *) dst_clone(&rt->dst);
1860 ip6_del_rt(rt);
1861 }
1862
1863 out:
1864 neigh_release(neigh);
1865 }
1866
1867 /*
1868 * Misc support functions
1869 */
1870
1871 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1872 const struct in6_addr *dest)
1873 {
1874 struct net *net = dev_net(ort->dst.dev);
1875 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1876 ort->rt6i_table);
1877
1878 if (rt) {
1879 rt->dst.input = ort->dst.input;
1880 rt->dst.output = ort->dst.output;
1881 rt->dst.flags |= DST_HOST;
1882
1883 rt->rt6i_dst.addr = *dest;
1884 rt->rt6i_dst.plen = 128;
1885 dst_copy_metrics(&rt->dst, &ort->dst);
1886 rt->dst.error = ort->dst.error;
1887 rt->rt6i_idev = ort->rt6i_idev;
1888 if (rt->rt6i_idev)
1889 in6_dev_hold(rt->rt6i_idev);
1890 rt->dst.lastuse = jiffies;
1891
1892 if (ort->rt6i_flags & RTF_GATEWAY)
1893 rt->rt6i_gateway = ort->rt6i_gateway;
1894 else
1895 rt->rt6i_gateway = *dest;
1896 rt->rt6i_flags = ort->rt6i_flags;
1897 rt6_set_from(rt, ort);
1898 rt->rt6i_metric = 0;
1899
1900 #ifdef CONFIG_IPV6_SUBTREES
1901 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1902 #endif
1903 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1904 rt->rt6i_table = ort->rt6i_table;
1905 }
1906 return rt;
1907 }
1908
1909 #ifdef CONFIG_IPV6_ROUTE_INFO
1910 static struct rt6_info *rt6_get_route_info(struct net *net,
1911 const struct in6_addr *prefix, int prefixlen,
1912 const struct in6_addr *gwaddr, int ifindex)
1913 {
1914 struct fib6_node *fn;
1915 struct rt6_info *rt = NULL;
1916 struct fib6_table *table;
1917
1918 table = fib6_get_table(net, RT6_TABLE_INFO);
1919 if (!table)
1920 return NULL;
1921
1922 read_lock_bh(&table->tb6_lock);
1923 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1924 if (!fn)
1925 goto out;
1926
1927 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1928 if (rt->dst.dev->ifindex != ifindex)
1929 continue;
1930 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1931 continue;
1932 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1933 continue;
1934 dst_hold(&rt->dst);
1935 break;
1936 }
1937 out:
1938 read_unlock_bh(&table->tb6_lock);
1939 return rt;
1940 }
1941
1942 static struct rt6_info *rt6_add_route_info(struct net *net,
1943 const struct in6_addr *prefix, int prefixlen,
1944 const struct in6_addr *gwaddr, int ifindex,
1945 unsigned int pref)
1946 {
1947 struct fib6_config cfg = {
1948 .fc_table = RT6_TABLE_INFO,
1949 .fc_metric = IP6_RT_PRIO_USER,
1950 .fc_ifindex = ifindex,
1951 .fc_dst_len = prefixlen,
1952 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1953 RTF_UP | RTF_PREF(pref),
1954 .fc_nlinfo.portid = 0,
1955 .fc_nlinfo.nlh = NULL,
1956 .fc_nlinfo.nl_net = net,
1957 };
1958
1959 cfg.fc_dst = *prefix;
1960 cfg.fc_gateway = *gwaddr;
1961
1962 /* We should treat it as a default route if prefix length is 0. */
1963 if (!prefixlen)
1964 cfg.fc_flags |= RTF_DEFAULT;
1965
1966 ip6_route_add(&cfg);
1967
1968 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1969 }
1970 #endif
1971
1972 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1973 {
1974 struct rt6_info *rt;
1975 struct fib6_table *table;
1976
1977 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1978 if (!table)
1979 return NULL;
1980
1981 read_lock_bh(&table->tb6_lock);
1982 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1983 if (dev == rt->dst.dev &&
1984 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1985 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1986 break;
1987 }
1988 if (rt)
1989 dst_hold(&rt->dst);
1990 read_unlock_bh(&table->tb6_lock);
1991 return rt;
1992 }
1993
1994 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1995 struct net_device *dev,
1996 unsigned int pref)
1997 {
1998 struct fib6_config cfg = {
1999 .fc_table = RT6_TABLE_DFLT,
2000 .fc_metric = IP6_RT_PRIO_USER,
2001 .fc_ifindex = dev->ifindex,
2002 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2003 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2004 .fc_nlinfo.portid = 0,
2005 .fc_nlinfo.nlh = NULL,
2006 .fc_nlinfo.nl_net = dev_net(dev),
2007 };
2008
2009 cfg.fc_gateway = *gwaddr;
2010
2011 ip6_route_add(&cfg);
2012
2013 return rt6_get_dflt_router(gwaddr, dev);
2014 }
2015
2016 void rt6_purge_dflt_routers(struct net *net)
2017 {
2018 struct rt6_info *rt;
2019 struct fib6_table *table;
2020
2021 /* NOTE: Keep consistent with rt6_get_dflt_router */
2022 table = fib6_get_table(net, RT6_TABLE_DFLT);
2023 if (!table)
2024 return;
2025
2026 restart:
2027 read_lock_bh(&table->tb6_lock);
2028 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2029 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2030 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2031 dst_hold(&rt->dst);
2032 read_unlock_bh(&table->tb6_lock);
2033 ip6_del_rt(rt);
2034 goto restart;
2035 }
2036 }
2037 read_unlock_bh(&table->tb6_lock);
2038 }
2039
2040 static void rtmsg_to_fib6_config(struct net *net,
2041 struct in6_rtmsg *rtmsg,
2042 struct fib6_config *cfg)
2043 {
2044 memset(cfg, 0, sizeof(*cfg));
2045
2046 cfg->fc_table = RT6_TABLE_MAIN;
2047 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2048 cfg->fc_metric = rtmsg->rtmsg_metric;
2049 cfg->fc_expires = rtmsg->rtmsg_info;
2050 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2051 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2052 cfg->fc_flags = rtmsg->rtmsg_flags;
2053
2054 cfg->fc_nlinfo.nl_net = net;
2055
2056 cfg->fc_dst = rtmsg->rtmsg_dst;
2057 cfg->fc_src = rtmsg->rtmsg_src;
2058 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2059 }
2060
2061 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2062 {
2063 struct fib6_config cfg;
2064 struct in6_rtmsg rtmsg;
2065 int err;
2066
2067 switch(cmd) {
2068 case SIOCADDRT: /* Add a route */
2069 case SIOCDELRT: /* Delete a route */
2070 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2071 return -EPERM;
2072 err = copy_from_user(&rtmsg, arg,
2073 sizeof(struct in6_rtmsg));
2074 if (err)
2075 return -EFAULT;
2076
2077 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2078
2079 rtnl_lock();
2080 switch (cmd) {
2081 case SIOCADDRT:
2082 err = ip6_route_add(&cfg);
2083 break;
2084 case SIOCDELRT:
2085 err = ip6_route_del(&cfg);
2086 break;
2087 default:
2088 err = -EINVAL;
2089 }
2090 rtnl_unlock();
2091
2092 return err;
2093 }
2094
2095 return -EINVAL;
2096 }
2097
2098 /*
2099 * Drop the packet on the floor
2100 */
2101
2102 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2103 {
2104 int type;
2105 struct dst_entry *dst = skb_dst(skb);
2106 switch (ipstats_mib_noroutes) {
2107 case IPSTATS_MIB_INNOROUTES:
2108 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2109 if (type == IPV6_ADDR_ANY) {
2110 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2111 IPSTATS_MIB_INADDRERRORS);
2112 break;
2113 }
2114 /* FALLTHROUGH */
2115 case IPSTATS_MIB_OUTNOROUTES:
2116 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2117 ipstats_mib_noroutes);
2118 break;
2119 }
2120 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2121 kfree_skb(skb);
2122 return 0;
2123 }
2124
2125 static int ip6_pkt_discard(struct sk_buff *skb)
2126 {
2127 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2128 }
2129
2130 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2131 {
2132 skb->dev = skb_dst(skb)->dev;
2133 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2134 }
2135
2136 static int ip6_pkt_prohibit(struct sk_buff *skb)
2137 {
2138 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2139 }
2140
2141 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2142 {
2143 skb->dev = skb_dst(skb)->dev;
2144 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2145 }
2146
2147 /*
2148 * Allocate a dst for local (unicast / anycast) address.
2149 */
2150
2151 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2152 const struct in6_addr *addr,
2153 bool anycast)
2154 {
2155 struct net *net = dev_net(idev->dev);
2156 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2157 DST_NOCOUNT, NULL);
2158 if (!rt)
2159 return ERR_PTR(-ENOMEM);
2160
2161 in6_dev_hold(idev);
2162
2163 rt->dst.flags |= DST_HOST;
2164 rt->dst.input = ip6_input;
2165 rt->dst.output = ip6_output;
2166 rt->rt6i_idev = idev;
2167
2168 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2169 if (anycast)
2170 rt->rt6i_flags |= RTF_ANYCAST;
2171 else
2172 rt->rt6i_flags |= RTF_LOCAL;
2173
2174 rt->rt6i_gateway = *addr;
2175 rt->rt6i_dst.addr = *addr;
2176 rt->rt6i_dst.plen = 128;
2177 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2178
2179 atomic_set(&rt->dst.__refcnt, 1);
2180
2181 return rt;
2182 }
2183
2184 int ip6_route_get_saddr(struct net *net,
2185 struct rt6_info *rt,
2186 const struct in6_addr *daddr,
2187 unsigned int prefs,
2188 struct in6_addr *saddr)
2189 {
2190 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2191 int err = 0;
2192 if (rt->rt6i_prefsrc.plen)
2193 *saddr = rt->rt6i_prefsrc.addr;
2194 else
2195 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2196 daddr, prefs, saddr);
2197 return err;
2198 }
2199
2200 /* remove deleted ip from prefsrc entries */
2201 struct arg_dev_net_ip {
2202 struct net_device *dev;
2203 struct net *net;
2204 struct in6_addr *addr;
2205 };
2206
2207 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2208 {
2209 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2210 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2211 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2212
2213 if (((void *)rt->dst.dev == dev || !dev) &&
2214 rt != net->ipv6.ip6_null_entry &&
2215 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2216 /* remove prefsrc entry */
2217 rt->rt6i_prefsrc.plen = 0;
2218 }
2219 return 0;
2220 }
2221
2222 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2223 {
2224 struct net *net = dev_net(ifp->idev->dev);
2225 struct arg_dev_net_ip adni = {
2226 .dev = ifp->idev->dev,
2227 .net = net,
2228 .addr = &ifp->addr,
2229 };
2230 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2231 }
2232
2233 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2234 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2235
2236 /* Remove routers and update dst entries when gateway turn into host. */
2237 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2238 {
2239 struct in6_addr *gateway = (struct in6_addr *)arg;
2240
2241 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2242 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2243 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2244 return -1;
2245 }
2246 return 0;
2247 }
2248
2249 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2250 {
2251 fib6_clean_all(net, fib6_clean_tohost, gateway);
2252 }
2253
2254 struct arg_dev_net {
2255 struct net_device *dev;
2256 struct net *net;
2257 };
2258
2259 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2260 {
2261 const struct arg_dev_net *adn = arg;
2262 const struct net_device *dev = adn->dev;
2263
2264 if ((rt->dst.dev == dev || !dev) &&
2265 rt != adn->net->ipv6.ip6_null_entry)
2266 return -1;
2267
2268 return 0;
2269 }
2270
2271 void rt6_ifdown(struct net *net, struct net_device *dev)
2272 {
2273 struct arg_dev_net adn = {
2274 .dev = dev,
2275 .net = net,
2276 };
2277
2278 fib6_clean_all(net, fib6_ifdown, &adn);
2279 icmp6_clean_all(fib6_ifdown, &adn);
2280 }
2281
2282 struct rt6_mtu_change_arg {
2283 struct net_device *dev;
2284 unsigned int mtu;
2285 };
2286
2287 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2288 {
2289 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2290 struct inet6_dev *idev;
2291
2292 /* In IPv6 pmtu discovery is not optional,
2293 so that RTAX_MTU lock cannot disable it.
2294 We still use this lock to block changes
2295 caused by addrconf/ndisc.
2296 */
2297
2298 idev = __in6_dev_get(arg->dev);
2299 if (!idev)
2300 return 0;
2301
2302 /* For administrative MTU increase, there is no way to discover
2303 IPv6 PMTU increase, so PMTU increase should be updated here.
2304 Since RFC 1981 doesn't include administrative MTU increase
2305 update PMTU increase is a MUST. (i.e. jumbo frame)
2306 */
2307 /*
2308 If new MTU is less than route PMTU, this new MTU will be the
2309 lowest MTU in the path, update the route PMTU to reflect PMTU
2310 decreases; if new MTU is greater than route PMTU, and the
2311 old MTU is the lowest MTU in the path, update the route PMTU
2312 to reflect the increase. In this case if the other nodes' MTU
2313 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2314 PMTU discouvery.
2315 */
2316 if (rt->dst.dev == arg->dev &&
2317 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2318 (dst_mtu(&rt->dst) >= arg->mtu ||
2319 (dst_mtu(&rt->dst) < arg->mtu &&
2320 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2321 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2322 }
2323 return 0;
2324 }
2325
2326 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2327 {
2328 struct rt6_mtu_change_arg arg = {
2329 .dev = dev,
2330 .mtu = mtu,
2331 };
2332
2333 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2334 }
2335
2336 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2337 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2338 [RTA_OIF] = { .type = NLA_U32 },
2339 [RTA_IIF] = { .type = NLA_U32 },
2340 [RTA_PRIORITY] = { .type = NLA_U32 },
2341 [RTA_METRICS] = { .type = NLA_NESTED },
2342 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2343 };
2344
2345 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2346 struct fib6_config *cfg)
2347 {
2348 struct rtmsg *rtm;
2349 struct nlattr *tb[RTA_MAX+1];
2350 int err;
2351
2352 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2353 if (err < 0)
2354 goto errout;
2355
2356 err = -EINVAL;
2357 rtm = nlmsg_data(nlh);
2358 memset(cfg, 0, sizeof(*cfg));
2359
2360 cfg->fc_table = rtm->rtm_table;
2361 cfg->fc_dst_len = rtm->rtm_dst_len;
2362 cfg->fc_src_len = rtm->rtm_src_len;
2363 cfg->fc_flags = RTF_UP;
2364 cfg->fc_protocol = rtm->rtm_protocol;
2365 cfg->fc_type = rtm->rtm_type;
2366
2367 if (rtm->rtm_type == RTN_UNREACHABLE ||
2368 rtm->rtm_type == RTN_BLACKHOLE ||
2369 rtm->rtm_type == RTN_PROHIBIT ||
2370 rtm->rtm_type == RTN_THROW)
2371 cfg->fc_flags |= RTF_REJECT;
2372
2373 if (rtm->rtm_type == RTN_LOCAL)
2374 cfg->fc_flags |= RTF_LOCAL;
2375
2376 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2377 cfg->fc_nlinfo.nlh = nlh;
2378 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2379
2380 if (tb[RTA_GATEWAY]) {
2381 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2382 cfg->fc_flags |= RTF_GATEWAY;
2383 }
2384
2385 if (tb[RTA_DST]) {
2386 int plen = (rtm->rtm_dst_len + 7) >> 3;
2387
2388 if (nla_len(tb[RTA_DST]) < plen)
2389 goto errout;
2390
2391 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2392 }
2393
2394 if (tb[RTA_SRC]) {
2395 int plen = (rtm->rtm_src_len + 7) >> 3;
2396
2397 if (nla_len(tb[RTA_SRC]) < plen)
2398 goto errout;
2399
2400 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2401 }
2402
2403 if (tb[RTA_PREFSRC])
2404 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2405
2406 if (tb[RTA_OIF])
2407 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2408
2409 if (tb[RTA_PRIORITY])
2410 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2411
2412 if (tb[RTA_METRICS]) {
2413 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2414 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2415 }
2416
2417 if (tb[RTA_TABLE])
2418 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2419
2420 if (tb[RTA_MULTIPATH]) {
2421 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2422 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2423 }
2424
2425 err = 0;
2426 errout:
2427 return err;
2428 }
2429
2430 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2431 {
2432 struct fib6_config r_cfg;
2433 struct rtnexthop *rtnh;
2434 int remaining;
2435 int attrlen;
2436 int err = 0, last_err = 0;
2437
2438 beginning:
2439 rtnh = (struct rtnexthop *)cfg->fc_mp;
2440 remaining = cfg->fc_mp_len;
2441
2442 /* Parse a Multipath Entry */
2443 while (rtnh_ok(rtnh, remaining)) {
2444 memcpy(&r_cfg, cfg, sizeof(*cfg));
2445 if (rtnh->rtnh_ifindex)
2446 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2447
2448 attrlen = rtnh_attrlen(rtnh);
2449 if (attrlen > 0) {
2450 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2451
2452 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2453 if (nla) {
2454 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2455 r_cfg.fc_flags |= RTF_GATEWAY;
2456 }
2457 }
2458 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2459 if (err) {
2460 last_err = err;
2461 /* If we are trying to remove a route, do not stop the
2462 * loop when ip6_route_del() fails (because next hop is
2463 * already gone), we should try to remove all next hops.
2464 */
2465 if (add) {
2466 /* If add fails, we should try to delete all
2467 * next hops that have been already added.
2468 */
2469 add = 0;
2470 goto beginning;
2471 }
2472 }
2473 /* Because each route is added like a single route we remove
2474 * this flag after the first nexthop (if there is a collision,
2475 * we have already fail to add the first nexthop:
2476 * fib6_add_rt2node() has reject it).
2477 */
2478 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2479 rtnh = rtnh_next(rtnh, &remaining);
2480 }
2481
2482 return last_err;
2483 }
2484
2485 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2486 {
2487 struct fib6_config cfg;
2488 int err;
2489
2490 err = rtm_to_fib6_config(skb, nlh, &cfg);
2491 if (err < 0)
2492 return err;
2493
2494 if (cfg.fc_mp)
2495 return ip6_route_multipath(&cfg, 0);
2496 else
2497 return ip6_route_del(&cfg);
2498 }
2499
2500 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2501 {
2502 struct fib6_config cfg;
2503 int err;
2504
2505 err = rtm_to_fib6_config(skb, nlh, &cfg);
2506 if (err < 0)
2507 return err;
2508
2509 if (cfg.fc_mp)
2510 return ip6_route_multipath(&cfg, 1);
2511 else
2512 return ip6_route_add(&cfg);
2513 }
2514
2515 static inline size_t rt6_nlmsg_size(void)
2516 {
2517 return NLMSG_ALIGN(sizeof(struct rtmsg))
2518 + nla_total_size(16) /* RTA_SRC */
2519 + nla_total_size(16) /* RTA_DST */
2520 + nla_total_size(16) /* RTA_GATEWAY */
2521 + nla_total_size(16) /* RTA_PREFSRC */
2522 + nla_total_size(4) /* RTA_TABLE */
2523 + nla_total_size(4) /* RTA_IIF */
2524 + nla_total_size(4) /* RTA_OIF */
2525 + nla_total_size(4) /* RTA_PRIORITY */
2526 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2527 + nla_total_size(sizeof(struct rta_cacheinfo));
2528 }
2529
2530 static int rt6_fill_node(struct net *net,
2531 struct sk_buff *skb, struct rt6_info *rt,
2532 struct in6_addr *dst, struct in6_addr *src,
2533 int iif, int type, u32 portid, u32 seq,
2534 int prefix, int nowait, unsigned int flags)
2535 {
2536 struct rtmsg *rtm;
2537 struct nlmsghdr *nlh;
2538 long expires;
2539 u32 table;
2540
2541 if (prefix) { /* user wants prefix routes only */
2542 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2543 /* success since this is not a prefix route */
2544 return 1;
2545 }
2546 }
2547
2548 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2549 if (!nlh)
2550 return -EMSGSIZE;
2551
2552 rtm = nlmsg_data(nlh);
2553 rtm->rtm_family = AF_INET6;
2554 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2555 rtm->rtm_src_len = rt->rt6i_src.plen;
2556 rtm->rtm_tos = 0;
2557 if (rt->rt6i_table)
2558 table = rt->rt6i_table->tb6_id;
2559 else
2560 table = RT6_TABLE_UNSPEC;
2561 rtm->rtm_table = table;
2562 if (nla_put_u32(skb, RTA_TABLE, table))
2563 goto nla_put_failure;
2564 if (rt->rt6i_flags & RTF_REJECT) {
2565 switch (rt->dst.error) {
2566 case -EINVAL:
2567 rtm->rtm_type = RTN_BLACKHOLE;
2568 break;
2569 case -EACCES:
2570 rtm->rtm_type = RTN_PROHIBIT;
2571 break;
2572 case -EAGAIN:
2573 rtm->rtm_type = RTN_THROW;
2574 break;
2575 default:
2576 rtm->rtm_type = RTN_UNREACHABLE;
2577 break;
2578 }
2579 }
2580 else if (rt->rt6i_flags & RTF_LOCAL)
2581 rtm->rtm_type = RTN_LOCAL;
2582 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2583 rtm->rtm_type = RTN_LOCAL;
2584 else
2585 rtm->rtm_type = RTN_UNICAST;
2586 rtm->rtm_flags = 0;
2587 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2588 rtm->rtm_protocol = rt->rt6i_protocol;
2589 if (rt->rt6i_flags & RTF_DYNAMIC)
2590 rtm->rtm_protocol = RTPROT_REDIRECT;
2591 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2592 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2593 rtm->rtm_protocol = RTPROT_RA;
2594 else
2595 rtm->rtm_protocol = RTPROT_KERNEL;
2596 }
2597
2598 if (rt->rt6i_flags & RTF_CACHE)
2599 rtm->rtm_flags |= RTM_F_CLONED;
2600
2601 if (dst) {
2602 if (nla_put(skb, RTA_DST, 16, dst))
2603 goto nla_put_failure;
2604 rtm->rtm_dst_len = 128;
2605 } else if (rtm->rtm_dst_len)
2606 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2607 goto nla_put_failure;
2608 #ifdef CONFIG_IPV6_SUBTREES
2609 if (src) {
2610 if (nla_put(skb, RTA_SRC, 16, src))
2611 goto nla_put_failure;
2612 rtm->rtm_src_len = 128;
2613 } else if (rtm->rtm_src_len &&
2614 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2615 goto nla_put_failure;
2616 #endif
2617 if (iif) {
2618 #ifdef CONFIG_IPV6_MROUTE
2619 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2620 int err = ip6mr_get_route(net, skb, rtm, nowait);
2621 if (err <= 0) {
2622 if (!nowait) {
2623 if (err == 0)
2624 return 0;
2625 goto nla_put_failure;
2626 } else {
2627 if (err == -EMSGSIZE)
2628 goto nla_put_failure;
2629 }
2630 }
2631 } else
2632 #endif
2633 if (nla_put_u32(skb, RTA_IIF, iif))
2634 goto nla_put_failure;
2635 } else if (dst) {
2636 struct in6_addr saddr_buf;
2637 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2638 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2639 goto nla_put_failure;
2640 }
2641
2642 if (rt->rt6i_prefsrc.plen) {
2643 struct in6_addr saddr_buf;
2644 saddr_buf = rt->rt6i_prefsrc.addr;
2645 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2646 goto nla_put_failure;
2647 }
2648
2649 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2650 goto nla_put_failure;
2651
2652 if (rt->rt6i_flags & RTF_GATEWAY) {
2653 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2654 goto nla_put_failure;
2655 }
2656
2657 if (rt->dst.dev &&
2658 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2659 goto nla_put_failure;
2660 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2661 goto nla_put_failure;
2662
2663 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2664
2665 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2666 goto nla_put_failure;
2667
2668 return nlmsg_end(skb, nlh);
2669
2670 nla_put_failure:
2671 nlmsg_cancel(skb, nlh);
2672 return -EMSGSIZE;
2673 }
2674
2675 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2676 {
2677 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2678 int prefix;
2679
2680 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2681 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2682 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2683 } else
2684 prefix = 0;
2685
2686 return rt6_fill_node(arg->net,
2687 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2688 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2689 prefix, 0, NLM_F_MULTI);
2690 }
2691
2692 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2693 {
2694 struct net *net = sock_net(in_skb->sk);
2695 struct nlattr *tb[RTA_MAX+1];
2696 struct rt6_info *rt;
2697 struct sk_buff *skb;
2698 struct rtmsg *rtm;
2699 struct flowi6 fl6;
2700 int err, iif = 0, oif = 0;
2701
2702 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2703 if (err < 0)
2704 goto errout;
2705
2706 err = -EINVAL;
2707 memset(&fl6, 0, sizeof(fl6));
2708
2709 if (tb[RTA_SRC]) {
2710 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2711 goto errout;
2712
2713 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2714 }
2715
2716 if (tb[RTA_DST]) {
2717 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2718 goto errout;
2719
2720 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2721 }
2722
2723 if (tb[RTA_IIF])
2724 iif = nla_get_u32(tb[RTA_IIF]);
2725
2726 if (tb[RTA_OIF])
2727 oif = nla_get_u32(tb[RTA_OIF]);
2728
2729 if (tb[RTA_MARK])
2730 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
2731
2732 if (iif) {
2733 struct net_device *dev;
2734 int flags = 0;
2735
2736 dev = __dev_get_by_index(net, iif);
2737 if (!dev) {
2738 err = -ENODEV;
2739 goto errout;
2740 }
2741
2742 fl6.flowi6_iif = iif;
2743
2744 if (!ipv6_addr_any(&fl6.saddr))
2745 flags |= RT6_LOOKUP_F_HAS_SADDR;
2746
2747 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2748 flags);
2749 } else {
2750 fl6.flowi6_oif = oif;
2751
2752 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2753 }
2754
2755 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2756 if (!skb) {
2757 ip6_rt_put(rt);
2758 err = -ENOBUFS;
2759 goto errout;
2760 }
2761
2762 /* Reserve room for dummy headers, this skb can pass
2763 through good chunk of routing engine.
2764 */
2765 skb_reset_mac_header(skb);
2766 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2767
2768 skb_dst_set(skb, &rt->dst);
2769
2770 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2771 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2772 nlh->nlmsg_seq, 0, 0, 0);
2773 if (err < 0) {
2774 kfree_skb(skb);
2775 goto errout;
2776 }
2777
2778 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2779 errout:
2780 return err;
2781 }
2782
2783 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2784 {
2785 struct sk_buff *skb;
2786 struct net *net = info->nl_net;
2787 u32 seq;
2788 int err;
2789
2790 err = -ENOBUFS;
2791 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2792
2793 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2794 if (!skb)
2795 goto errout;
2796
2797 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2798 event, info->portid, seq, 0, 0, 0);
2799 if (err < 0) {
2800 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2801 WARN_ON(err == -EMSGSIZE);
2802 kfree_skb(skb);
2803 goto errout;
2804 }
2805 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2806 info->nlh, gfp_any());
2807 return;
2808 errout:
2809 if (err < 0)
2810 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2811 }
2812
2813 static int ip6_route_dev_notify(struct notifier_block *this,
2814 unsigned long event, void *ptr)
2815 {
2816 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2817 struct net *net = dev_net(dev);
2818
2819 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2820 net->ipv6.ip6_null_entry->dst.dev = dev;
2821 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2822 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2823 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2824 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2825 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2826 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2827 #endif
2828 }
2829
2830 return NOTIFY_OK;
2831 }
2832
2833 /*
2834 * /proc
2835 */
2836
2837 #ifdef CONFIG_PROC_FS
2838
2839 static const struct file_operations ipv6_route_proc_fops = {
2840 .owner = THIS_MODULE,
2841 .open = ipv6_route_open,
2842 .read = seq_read,
2843 .llseek = seq_lseek,
2844 .release = seq_release_net,
2845 };
2846
2847 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2848 {
2849 struct net *net = (struct net *)seq->private;
2850 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2851 net->ipv6.rt6_stats->fib_nodes,
2852 net->ipv6.rt6_stats->fib_route_nodes,
2853 net->ipv6.rt6_stats->fib_rt_alloc,
2854 net->ipv6.rt6_stats->fib_rt_entries,
2855 net->ipv6.rt6_stats->fib_rt_cache,
2856 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2857 net->ipv6.rt6_stats->fib_discarded_routes);
2858
2859 return 0;
2860 }
2861
2862 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2863 {
2864 return single_open_net(inode, file, rt6_stats_seq_show);
2865 }
2866
2867 static const struct file_operations rt6_stats_seq_fops = {
2868 .owner = THIS_MODULE,
2869 .open = rt6_stats_seq_open,
2870 .read = seq_read,
2871 .llseek = seq_lseek,
2872 .release = single_release_net,
2873 };
2874 #endif /* CONFIG_PROC_FS */
2875
2876 #ifdef CONFIG_SYSCTL
2877
2878 static
2879 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2880 void __user *buffer, size_t *lenp, loff_t *ppos)
2881 {
2882 struct net *net;
2883 int delay;
2884 if (!write)
2885 return -EINVAL;
2886
2887 net = (struct net *)ctl->extra1;
2888 delay = net->ipv6.sysctl.flush_delay;
2889 proc_dointvec(ctl, write, buffer, lenp, ppos);
2890 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2891 return 0;
2892 }
2893
2894 struct ctl_table ipv6_route_table_template[] = {
2895 {
2896 .procname = "flush",
2897 .data = &init_net.ipv6.sysctl.flush_delay,
2898 .maxlen = sizeof(int),
2899 .mode = 0200,
2900 .proc_handler = ipv6_sysctl_rtcache_flush
2901 },
2902 {
2903 .procname = "gc_thresh",
2904 .data = &ip6_dst_ops_template.gc_thresh,
2905 .maxlen = sizeof(int),
2906 .mode = 0644,
2907 .proc_handler = proc_dointvec,
2908 },
2909 {
2910 .procname = "max_size",
2911 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2912 .maxlen = sizeof(int),
2913 .mode = 0644,
2914 .proc_handler = proc_dointvec,
2915 },
2916 {
2917 .procname = "gc_min_interval",
2918 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2919 .maxlen = sizeof(int),
2920 .mode = 0644,
2921 .proc_handler = proc_dointvec_jiffies,
2922 },
2923 {
2924 .procname = "gc_timeout",
2925 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2926 .maxlen = sizeof(int),
2927 .mode = 0644,
2928 .proc_handler = proc_dointvec_jiffies,
2929 },
2930 {
2931 .procname = "gc_interval",
2932 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2933 .maxlen = sizeof(int),
2934 .mode = 0644,
2935 .proc_handler = proc_dointvec_jiffies,
2936 },
2937 {
2938 .procname = "gc_elasticity",
2939 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2940 .maxlen = sizeof(int),
2941 .mode = 0644,
2942 .proc_handler = proc_dointvec,
2943 },
2944 {
2945 .procname = "mtu_expires",
2946 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2947 .maxlen = sizeof(int),
2948 .mode = 0644,
2949 .proc_handler = proc_dointvec_jiffies,
2950 },
2951 {
2952 .procname = "min_adv_mss",
2953 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2954 .maxlen = sizeof(int),
2955 .mode = 0644,
2956 .proc_handler = proc_dointvec,
2957 },
2958 {
2959 .procname = "gc_min_interval_ms",
2960 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2961 .maxlen = sizeof(int),
2962 .mode = 0644,
2963 .proc_handler = proc_dointvec_ms_jiffies,
2964 },
2965 { }
2966 };
2967
2968 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2969 {
2970 struct ctl_table *table;
2971
2972 table = kmemdup(ipv6_route_table_template,
2973 sizeof(ipv6_route_table_template),
2974 GFP_KERNEL);
2975
2976 if (table) {
2977 table[0].data = &net->ipv6.sysctl.flush_delay;
2978 table[0].extra1 = net;
2979 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2980 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2981 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2982 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2983 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2984 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2985 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2986 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2987 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2988
2989 /* Don't export sysctls to unprivileged users */
2990 if (net->user_ns != &init_user_ns)
2991 table[0].procname = NULL;
2992 }
2993
2994 return table;
2995 }
2996 #endif
2997
2998 static int __net_init ip6_route_net_init(struct net *net)
2999 {
3000 int ret = -ENOMEM;
3001
3002 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3003 sizeof(net->ipv6.ip6_dst_ops));
3004
3005 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3006 goto out_ip6_dst_ops;
3007
3008 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3009 sizeof(*net->ipv6.ip6_null_entry),
3010 GFP_KERNEL);
3011 if (!net->ipv6.ip6_null_entry)
3012 goto out_ip6_dst_entries;
3013 net->ipv6.ip6_null_entry->dst.path =
3014 (struct dst_entry *)net->ipv6.ip6_null_entry;
3015 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3016 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3017 ip6_template_metrics, true);
3018
3019 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3020 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3021 sizeof(*net->ipv6.ip6_prohibit_entry),
3022 GFP_KERNEL);
3023 if (!net->ipv6.ip6_prohibit_entry)
3024 goto out_ip6_null_entry;
3025 net->ipv6.ip6_prohibit_entry->dst.path =
3026 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3027 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3028 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3029 ip6_template_metrics, true);
3030
3031 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3032 sizeof(*net->ipv6.ip6_blk_hole_entry),
3033 GFP_KERNEL);
3034 if (!net->ipv6.ip6_blk_hole_entry)
3035 goto out_ip6_prohibit_entry;
3036 net->ipv6.ip6_blk_hole_entry->dst.path =
3037 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3038 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3039 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3040 ip6_template_metrics, true);
3041 #endif
3042
3043 net->ipv6.sysctl.flush_delay = 0;
3044 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3045 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3046 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3047 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3048 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3049 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3050 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3051
3052 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3053
3054 ret = 0;
3055 out:
3056 return ret;
3057
3058 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3059 out_ip6_prohibit_entry:
3060 kfree(net->ipv6.ip6_prohibit_entry);
3061 out_ip6_null_entry:
3062 kfree(net->ipv6.ip6_null_entry);
3063 #endif
3064 out_ip6_dst_entries:
3065 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3066 out_ip6_dst_ops:
3067 goto out;
3068 }
3069
3070 static void __net_exit ip6_route_net_exit(struct net *net)
3071 {
3072 kfree(net->ipv6.ip6_null_entry);
3073 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3074 kfree(net->ipv6.ip6_prohibit_entry);
3075 kfree(net->ipv6.ip6_blk_hole_entry);
3076 #endif
3077 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3078 }
3079
3080 static int __net_init ip6_route_net_init_late(struct net *net)
3081 {
3082 #ifdef CONFIG_PROC_FS
3083 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3084 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3085 #endif
3086 return 0;
3087 }
3088
3089 static void __net_exit ip6_route_net_exit_late(struct net *net)
3090 {
3091 #ifdef CONFIG_PROC_FS
3092 remove_proc_entry("ipv6_route", net->proc_net);
3093 remove_proc_entry("rt6_stats", net->proc_net);
3094 #endif
3095 }
3096
3097 static struct pernet_operations ip6_route_net_ops = {
3098 .init = ip6_route_net_init,
3099 .exit = ip6_route_net_exit,
3100 };
3101
3102 static int __net_init ipv6_inetpeer_init(struct net *net)
3103 {
3104 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3105
3106 if (!bp)
3107 return -ENOMEM;
3108 inet_peer_base_init(bp);
3109 net->ipv6.peers = bp;
3110 return 0;
3111 }
3112
3113 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3114 {
3115 struct inet_peer_base *bp = net->ipv6.peers;
3116
3117 net->ipv6.peers = NULL;
3118 inetpeer_invalidate_tree(bp);
3119 kfree(bp);
3120 }
3121
3122 static struct pernet_operations ipv6_inetpeer_ops = {
3123 .init = ipv6_inetpeer_init,
3124 .exit = ipv6_inetpeer_exit,
3125 };
3126
3127 static struct pernet_operations ip6_route_net_late_ops = {
3128 .init = ip6_route_net_init_late,
3129 .exit = ip6_route_net_exit_late,
3130 };
3131
3132 static struct notifier_block ip6_route_dev_notifier = {
3133 .notifier_call = ip6_route_dev_notify,
3134 .priority = 0,
3135 };
3136
3137 int __init ip6_route_init(void)
3138 {
3139 int ret;
3140
3141 ret = -ENOMEM;
3142 ip6_dst_ops_template.kmem_cachep =
3143 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3144 SLAB_HWCACHE_ALIGN, NULL);
3145 if (!ip6_dst_ops_template.kmem_cachep)
3146 goto out;
3147
3148 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3149 if (ret)
3150 goto out_kmem_cache;
3151
3152 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3153 if (ret)
3154 goto out_dst_entries;
3155
3156 ret = register_pernet_subsys(&ip6_route_net_ops);
3157 if (ret)
3158 goto out_register_inetpeer;
3159
3160 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3161
3162 /* Registering of the loopback is done before this portion of code,
3163 * the loopback reference in rt6_info will not be taken, do it
3164 * manually for init_net */
3165 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3166 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3167 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3168 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3169 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3170 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3171 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3172 #endif
3173 ret = fib6_init();
3174 if (ret)
3175 goto out_register_subsys;
3176
3177 ret = xfrm6_init();
3178 if (ret)
3179 goto out_fib6_init;
3180
3181 ret = fib6_rules_init();
3182 if (ret)
3183 goto xfrm6_init;
3184
3185 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3186 if (ret)
3187 goto fib6_rules_init;
3188
3189 ret = -ENOBUFS;
3190 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3191 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3192 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3193 goto out_register_late_subsys;
3194
3195 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3196 if (ret)
3197 goto out_register_late_subsys;
3198
3199 out:
3200 return ret;
3201
3202 out_register_late_subsys:
3203 unregister_pernet_subsys(&ip6_route_net_late_ops);
3204 fib6_rules_init:
3205 fib6_rules_cleanup();
3206 xfrm6_init:
3207 xfrm6_fini();
3208 out_fib6_init:
3209 fib6_gc_cleanup();
3210 out_register_subsys:
3211 unregister_pernet_subsys(&ip6_route_net_ops);
3212 out_register_inetpeer:
3213 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3214 out_dst_entries:
3215 dst_entries_destroy(&ip6_dst_blackhole_ops);
3216 out_kmem_cache:
3217 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3218 goto out;
3219 }
3220
3221 void ip6_route_cleanup(void)
3222 {
3223 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3224 unregister_pernet_subsys(&ip6_route_net_late_ops);
3225 fib6_rules_cleanup();
3226 xfrm6_fini();
3227 fib6_gc_cleanup();
3228 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3229 unregister_pernet_subsys(&ip6_route_net_ops);
3230 dst_entries_destroy(&ip6_dst_blackhole_ops);
3231 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3232 }
(deprecated) Btrfs devel tree