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net/xfrm/xfrm_output.c: move EXPORT_SYMBOL
[deliverable/linux.git] / net / ipv6 / route.c
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 rt->rt6i_genid = rt_genid_ipv6(net);
318 INIT_LIST_HEAD(&rt->rt6i_siblings);
319 }
320 return rt;
321 }
322
323 static void ip6_dst_destroy(struct dst_entry *dst)
324 {
325 struct rt6_info *rt = (struct rt6_info *)dst;
326 struct inet6_dev *idev = rt->rt6i_idev;
327 struct dst_entry *from = dst->from;
328
329 if (!(rt->dst.flags & DST_HOST))
330 dst_destroy_metrics_generic(dst);
331
332 if (idev) {
333 rt->rt6i_idev = NULL;
334 in6_dev_put(idev);
335 }
336
337 dst->from = NULL;
338 dst_release(from);
339
340 if (rt6_has_peer(rt)) {
341 struct inet_peer *peer = rt6_peer_ptr(rt);
342 inet_putpeer(peer);
343 }
344 }
345
346 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
347 int how)
348 {
349 struct rt6_info *rt = (struct rt6_info *)dst;
350 struct inet6_dev *idev = rt->rt6i_idev;
351 struct net_device *loopback_dev =
352 dev_net(dev)->loopback_dev;
353
354 if (dev != loopback_dev) {
355 if (idev && idev->dev == dev) {
356 struct inet6_dev *loopback_idev =
357 in6_dev_get(loopback_dev);
358 if (loopback_idev) {
359 rt->rt6i_idev = loopback_idev;
360 in6_dev_put(idev);
361 }
362 }
363 }
364 }
365
366 static bool rt6_check_expired(const struct rt6_info *rt)
367 {
368 if (rt->rt6i_flags & RTF_EXPIRES) {
369 if (time_after(jiffies, rt->dst.expires))
370 return true;
371 } else if (rt->dst.from) {
372 return rt6_check_expired((struct rt6_info *) rt->dst.from);
373 }
374 return false;
375 }
376
377 /* Multipath route selection:
378 * Hash based function using packet header and flowlabel.
379 * Adapted from fib_info_hashfn()
380 */
381 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
382 const struct flowi6 *fl6)
383 {
384 unsigned int val = fl6->flowi6_proto;
385
386 val ^= ipv6_addr_hash(&fl6->daddr);
387 val ^= ipv6_addr_hash(&fl6->saddr);
388
389 /* Work only if this not encapsulated */
390 switch (fl6->flowi6_proto) {
391 case IPPROTO_UDP:
392 case IPPROTO_TCP:
393 case IPPROTO_SCTP:
394 val ^= (__force u16)fl6->fl6_sport;
395 val ^= (__force u16)fl6->fl6_dport;
396 break;
397
398 case IPPROTO_ICMPV6:
399 val ^= (__force u16)fl6->fl6_icmp_type;
400 val ^= (__force u16)fl6->fl6_icmp_code;
401 break;
402 }
403 /* RFC6438 recommands to use flowlabel */
404 val ^= (__force u32)fl6->flowlabel;
405
406 /* Perhaps, we need to tune, this function? */
407 val = val ^ (val >> 7) ^ (val >> 12);
408 return val % candidate_count;
409 }
410
411 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
412 struct flowi6 *fl6, int oif,
413 int strict)
414 {
415 struct rt6_info *sibling, *next_sibling;
416 int route_choosen;
417
418 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
419 /* Don't change the route, if route_choosen == 0
420 * (siblings does not include ourself)
421 */
422 if (route_choosen)
423 list_for_each_entry_safe(sibling, next_sibling,
424 &match->rt6i_siblings, rt6i_siblings) {
425 route_choosen--;
426 if (route_choosen == 0) {
427 if (rt6_score_route(sibling, oif, strict) < 0)
428 break;
429 match = sibling;
430 break;
431 }
432 }
433 return match;
434 }
435
436 /*
437 * Route lookup. Any table->tb6_lock is implied.
438 */
439
440 static inline struct rt6_info *rt6_device_match(struct net *net,
441 struct rt6_info *rt,
442 const struct in6_addr *saddr,
443 int oif,
444 int flags)
445 {
446 struct rt6_info *local = NULL;
447 struct rt6_info *sprt;
448
449 if (!oif && ipv6_addr_any(saddr))
450 goto out;
451
452 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
453 struct net_device *dev = sprt->dst.dev;
454
455 if (oif) {
456 if (dev->ifindex == oif)
457 return sprt;
458 if (dev->flags & IFF_LOOPBACK) {
459 if (!sprt->rt6i_idev ||
460 sprt->rt6i_idev->dev->ifindex != oif) {
461 if (flags & RT6_LOOKUP_F_IFACE && oif)
462 continue;
463 if (local && (!oif ||
464 local->rt6i_idev->dev->ifindex == oif))
465 continue;
466 }
467 local = sprt;
468 }
469 } else {
470 if (ipv6_chk_addr(net, saddr, dev,
471 flags & RT6_LOOKUP_F_IFACE))
472 return sprt;
473 }
474 }
475
476 if (oif) {
477 if (local)
478 return local;
479
480 if (flags & RT6_LOOKUP_F_IFACE)
481 return net->ipv6.ip6_null_entry;
482 }
483 out:
484 return rt;
485 }
486
487 #ifdef CONFIG_IPV6_ROUTER_PREF
488 struct __rt6_probe_work {
489 struct work_struct work;
490 struct in6_addr target;
491 struct net_device *dev;
492 };
493
494 static void rt6_probe_deferred(struct work_struct *w)
495 {
496 struct in6_addr mcaddr;
497 struct __rt6_probe_work *work =
498 container_of(w, struct __rt6_probe_work, work);
499
500 addrconf_addr_solict_mult(&work->target, &mcaddr);
501 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
502 dev_put(work->dev);
503 kfree(w);
504 }
505
506 static void rt6_probe(struct rt6_info *rt)
507 {
508 struct neighbour *neigh;
509 /*
510 * Okay, this does not seem to be appropriate
511 * for now, however, we need to check if it
512 * is really so; aka Router Reachability Probing.
513 *
514 * Router Reachability Probe MUST be rate-limited
515 * to no more than one per minute.
516 */
517 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
518 return;
519 rcu_read_lock_bh();
520 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
521 if (neigh) {
522 write_lock(&neigh->lock);
523 if (neigh->nud_state & NUD_VALID)
524 goto out;
525 }
526
527 if (!neigh ||
528 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
529 struct __rt6_probe_work *work;
530
531 work = kmalloc(sizeof(*work), GFP_ATOMIC);
532
533 if (neigh && work)
534 __neigh_set_probe_once(neigh);
535
536 if (neigh)
537 write_unlock(&neigh->lock);
538
539 if (work) {
540 INIT_WORK(&work->work, rt6_probe_deferred);
541 work->target = rt->rt6i_gateway;
542 dev_hold(rt->dst.dev);
543 work->dev = rt->dst.dev;
544 schedule_work(&work->work);
545 }
546 } else {
547 out:
548 write_unlock(&neigh->lock);
549 }
550 rcu_read_unlock_bh();
551 }
552 #else
553 static inline void rt6_probe(struct rt6_info *rt)
554 {
555 }
556 #endif
557
558 /*
559 * Default Router Selection (RFC 2461 6.3.6)
560 */
561 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
562 {
563 struct net_device *dev = rt->dst.dev;
564 if (!oif || dev->ifindex == oif)
565 return 2;
566 if ((dev->flags & IFF_LOOPBACK) &&
567 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
568 return 1;
569 return 0;
570 }
571
572 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
573 {
574 struct neighbour *neigh;
575 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
576
577 if (rt->rt6i_flags & RTF_NONEXTHOP ||
578 !(rt->rt6i_flags & RTF_GATEWAY))
579 return RT6_NUD_SUCCEED;
580
581 rcu_read_lock_bh();
582 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
583 if (neigh) {
584 read_lock(&neigh->lock);
585 if (neigh->nud_state & NUD_VALID)
586 ret = RT6_NUD_SUCCEED;
587 #ifdef CONFIG_IPV6_ROUTER_PREF
588 else if (!(neigh->nud_state & NUD_FAILED))
589 ret = RT6_NUD_SUCCEED;
590 else
591 ret = RT6_NUD_FAIL_PROBE;
592 #endif
593 read_unlock(&neigh->lock);
594 } else {
595 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
596 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
597 }
598 rcu_read_unlock_bh();
599
600 return ret;
601 }
602
603 static int rt6_score_route(struct rt6_info *rt, int oif,
604 int strict)
605 {
606 int m;
607
608 m = rt6_check_dev(rt, oif);
609 if (!m && (strict & RT6_LOOKUP_F_IFACE))
610 return RT6_NUD_FAIL_HARD;
611 #ifdef CONFIG_IPV6_ROUTER_PREF
612 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
613 #endif
614 if (strict & RT6_LOOKUP_F_REACHABLE) {
615 int n = rt6_check_neigh(rt);
616 if (n < 0)
617 return n;
618 }
619 return m;
620 }
621
622 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
623 int *mpri, struct rt6_info *match,
624 bool *do_rr)
625 {
626 int m;
627 bool match_do_rr = false;
628
629 if (rt6_check_expired(rt))
630 goto out;
631
632 m = rt6_score_route(rt, oif, strict);
633 if (m == RT6_NUD_FAIL_DO_RR) {
634 match_do_rr = true;
635 m = 0; /* lowest valid score */
636 } else if (m == RT6_NUD_FAIL_HARD) {
637 goto out;
638 }
639
640 if (strict & RT6_LOOKUP_F_REACHABLE)
641 rt6_probe(rt);
642
643 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
644 if (m > *mpri) {
645 *do_rr = match_do_rr;
646 *mpri = m;
647 match = rt;
648 }
649 out:
650 return match;
651 }
652
653 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
654 struct rt6_info *rr_head,
655 u32 metric, int oif, int strict,
656 bool *do_rr)
657 {
658 struct rt6_info *rt, *match;
659 int mpri = -1;
660
661 match = NULL;
662 for (rt = rr_head; rt && rt->rt6i_metric == metric;
663 rt = rt->dst.rt6_next)
664 match = find_match(rt, oif, strict, &mpri, match, do_rr);
665 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
666 rt = rt->dst.rt6_next)
667 match = find_match(rt, oif, strict, &mpri, match, do_rr);
668
669 return match;
670 }
671
672 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
673 {
674 struct rt6_info *match, *rt0;
675 struct net *net;
676 bool do_rr = false;
677
678 rt0 = fn->rr_ptr;
679 if (!rt0)
680 fn->rr_ptr = rt0 = fn->leaf;
681
682 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
683 &do_rr);
684
685 if (do_rr) {
686 struct rt6_info *next = rt0->dst.rt6_next;
687
688 /* no entries matched; do round-robin */
689 if (!next || next->rt6i_metric != rt0->rt6i_metric)
690 next = fn->leaf;
691
692 if (next != rt0)
693 fn->rr_ptr = next;
694 }
695
696 net = dev_net(rt0->dst.dev);
697 return match ? match : net->ipv6.ip6_null_entry;
698 }
699
700 #ifdef CONFIG_IPV6_ROUTE_INFO
701 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
702 const struct in6_addr *gwaddr)
703 {
704 struct net *net = dev_net(dev);
705 struct route_info *rinfo = (struct route_info *) opt;
706 struct in6_addr prefix_buf, *prefix;
707 unsigned int pref;
708 unsigned long lifetime;
709 struct rt6_info *rt;
710
711 if (len < sizeof(struct route_info)) {
712 return -EINVAL;
713 }
714
715 /* Sanity check for prefix_len and length */
716 if (rinfo->length > 3) {
717 return -EINVAL;
718 } else if (rinfo->prefix_len > 128) {
719 return -EINVAL;
720 } else if (rinfo->prefix_len > 64) {
721 if (rinfo->length < 2) {
722 return -EINVAL;
723 }
724 } else if (rinfo->prefix_len > 0) {
725 if (rinfo->length < 1) {
726 return -EINVAL;
727 }
728 }
729
730 pref = rinfo->route_pref;
731 if (pref == ICMPV6_ROUTER_PREF_INVALID)
732 return -EINVAL;
733
734 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
735
736 if (rinfo->length == 3)
737 prefix = (struct in6_addr *)rinfo->prefix;
738 else {
739 /* this function is safe */
740 ipv6_addr_prefix(&prefix_buf,
741 (struct in6_addr *)rinfo->prefix,
742 rinfo->prefix_len);
743 prefix = &prefix_buf;
744 }
745
746 if (rinfo->prefix_len == 0)
747 rt = rt6_get_dflt_router(gwaddr, dev);
748 else
749 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
750 gwaddr, dev->ifindex);
751
752 if (rt && !lifetime) {
753 ip6_del_rt(rt);
754 rt = NULL;
755 }
756
757 if (!rt && lifetime)
758 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
759 pref);
760 else if (rt)
761 rt->rt6i_flags = RTF_ROUTEINFO |
762 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
763
764 if (rt) {
765 if (!addrconf_finite_timeout(lifetime))
766 rt6_clean_expires(rt);
767 else
768 rt6_set_expires(rt, jiffies + HZ * lifetime);
769
770 ip6_rt_put(rt);
771 }
772 return 0;
773 }
774 #endif
775
776 #define BACKTRACK(__net, saddr) \
777 do { \
778 if (rt == __net->ipv6.ip6_null_entry) { \
779 struct fib6_node *pn; \
780 while (1) { \
781 if (fn->fn_flags & RTN_TL_ROOT) \
782 goto out; \
783 pn = fn->parent; \
784 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
785 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
786 else \
787 fn = pn; \
788 if (fn->fn_flags & RTN_RTINFO) \
789 goto restart; \
790 } \
791 } \
792 } while (0)
793
794 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
795 struct fib6_table *table,
796 struct flowi6 *fl6, int flags)
797 {
798 struct fib6_node *fn;
799 struct rt6_info *rt;
800
801 read_lock_bh(&table->tb6_lock);
802 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
803 restart:
804 rt = fn->leaf;
805 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
806 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
807 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
808 BACKTRACK(net, &fl6->saddr);
809 out:
810 dst_use(&rt->dst, jiffies);
811 read_unlock_bh(&table->tb6_lock);
812 return rt;
813
814 }
815
816 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
817 int flags)
818 {
819 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
820 }
821 EXPORT_SYMBOL_GPL(ip6_route_lookup);
822
823 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
824 const struct in6_addr *saddr, int oif, int strict)
825 {
826 struct flowi6 fl6 = {
827 .flowi6_oif = oif,
828 .daddr = *daddr,
829 };
830 struct dst_entry *dst;
831 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
832
833 if (saddr) {
834 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
835 flags |= RT6_LOOKUP_F_HAS_SADDR;
836 }
837
838 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
839 if (dst->error == 0)
840 return (struct rt6_info *) dst;
841
842 dst_release(dst);
843
844 return NULL;
845 }
846
847 EXPORT_SYMBOL(rt6_lookup);
848
849 /* ip6_ins_rt is called with FREE table->tb6_lock.
850 It takes new route entry, the addition fails by any reason the
851 route is freed. In any case, if caller does not hold it, it may
852 be destroyed.
853 */
854
855 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
856 struct nlattr *mx, int mx_len)
857 {
858 int err;
859 struct fib6_table *table;
860
861 table = rt->rt6i_table;
862 write_lock_bh(&table->tb6_lock);
863 err = fib6_add(&table->tb6_root, rt, info, mx, mx_len);
864 write_unlock_bh(&table->tb6_lock);
865
866 return err;
867 }
868
869 int ip6_ins_rt(struct rt6_info *rt)
870 {
871 struct nl_info info = {
872 .nl_net = dev_net(rt->dst.dev),
873 };
874 return __ip6_ins_rt(rt, &info, NULL, 0);
875 }
876
877 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
878 const struct in6_addr *daddr,
879 const struct in6_addr *saddr)
880 {
881 struct rt6_info *rt;
882
883 /*
884 * Clone the route.
885 */
886
887 rt = ip6_rt_copy(ort, daddr);
888
889 if (rt) {
890 if (ort->rt6i_dst.plen != 128 &&
891 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
892 rt->rt6i_flags |= RTF_ANYCAST;
893
894 rt->rt6i_flags |= RTF_CACHE;
895
896 #ifdef CONFIG_IPV6_SUBTREES
897 if (rt->rt6i_src.plen && saddr) {
898 rt->rt6i_src.addr = *saddr;
899 rt->rt6i_src.plen = 128;
900 }
901 #endif
902 }
903
904 return rt;
905 }
906
907 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
908 const struct in6_addr *daddr)
909 {
910 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
911
912 if (rt)
913 rt->rt6i_flags |= RTF_CACHE;
914 return rt;
915 }
916
917 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
918 struct flowi6 *fl6, int flags)
919 {
920 struct fib6_node *fn;
921 struct rt6_info *rt, *nrt;
922 int strict = 0;
923 int attempts = 3;
924 int err;
925 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
926
927 strict |= flags & RT6_LOOKUP_F_IFACE;
928
929 relookup:
930 read_lock_bh(&table->tb6_lock);
931
932 restart_2:
933 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
934
935 restart:
936 rt = rt6_select(fn, oif, strict | reachable);
937 if (rt->rt6i_nsiblings)
938 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
939 BACKTRACK(net, &fl6->saddr);
940 if (rt == net->ipv6.ip6_null_entry ||
941 rt->rt6i_flags & RTF_CACHE)
942 goto out;
943
944 dst_hold(&rt->dst);
945 read_unlock_bh(&table->tb6_lock);
946
947 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
948 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
949 else if (!(rt->dst.flags & DST_HOST))
950 nrt = rt6_alloc_clone(rt, &fl6->daddr);
951 else
952 goto out2;
953
954 ip6_rt_put(rt);
955 rt = nrt ? : net->ipv6.ip6_null_entry;
956
957 dst_hold(&rt->dst);
958 if (nrt) {
959 err = ip6_ins_rt(nrt);
960 if (!err)
961 goto out2;
962 }
963
964 if (--attempts <= 0)
965 goto out2;
966
967 /*
968 * Race condition! In the gap, when table->tb6_lock was
969 * released someone could insert this route. Relookup.
970 */
971 ip6_rt_put(rt);
972 goto relookup;
973
974 out:
975 if (reachable) {
976 reachable = 0;
977 goto restart_2;
978 }
979 dst_hold(&rt->dst);
980 read_unlock_bh(&table->tb6_lock);
981 out2:
982 rt->dst.lastuse = jiffies;
983 rt->dst.__use++;
984
985 return rt;
986 }
987
988 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
989 struct flowi6 *fl6, int flags)
990 {
991 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
992 }
993
994 static struct dst_entry *ip6_route_input_lookup(struct net *net,
995 struct net_device *dev,
996 struct flowi6 *fl6, int flags)
997 {
998 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
999 flags |= RT6_LOOKUP_F_IFACE;
1000
1001 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1002 }
1003
1004 void ip6_route_input(struct sk_buff *skb)
1005 {
1006 const struct ipv6hdr *iph = ipv6_hdr(skb);
1007 struct net *net = dev_net(skb->dev);
1008 int flags = RT6_LOOKUP_F_HAS_SADDR;
1009 struct flowi6 fl6 = {
1010 .flowi6_iif = skb->dev->ifindex,
1011 .daddr = iph->daddr,
1012 .saddr = iph->saddr,
1013 .flowlabel = ip6_flowinfo(iph),
1014 .flowi6_mark = skb->mark,
1015 .flowi6_proto = iph->nexthdr,
1016 };
1017
1018 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1019 }
1020
1021 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1022 struct flowi6 *fl6, int flags)
1023 {
1024 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1025 }
1026
1027 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1028 struct flowi6 *fl6)
1029 {
1030 int flags = 0;
1031
1032 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1033
1034 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1035 flags |= RT6_LOOKUP_F_IFACE;
1036
1037 if (!ipv6_addr_any(&fl6->saddr))
1038 flags |= RT6_LOOKUP_F_HAS_SADDR;
1039 else if (sk)
1040 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1041
1042 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1043 }
1044
1045 EXPORT_SYMBOL(ip6_route_output);
1046
1047 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1048 {
1049 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1050 struct dst_entry *new = NULL;
1051
1052 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1053 if (rt) {
1054 new = &rt->dst;
1055
1056 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1057 rt6_init_peer(rt, net->ipv6.peers);
1058
1059 new->__use = 1;
1060 new->input = dst_discard;
1061 new->output = dst_discard_sk;
1062
1063 if (dst_metrics_read_only(&ort->dst))
1064 new->_metrics = ort->dst._metrics;
1065 else
1066 dst_copy_metrics(new, &ort->dst);
1067 rt->rt6i_idev = ort->rt6i_idev;
1068 if (rt->rt6i_idev)
1069 in6_dev_hold(rt->rt6i_idev);
1070
1071 rt->rt6i_gateway = ort->rt6i_gateway;
1072 rt->rt6i_flags = ort->rt6i_flags;
1073 rt->rt6i_metric = 0;
1074
1075 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1076 #ifdef CONFIG_IPV6_SUBTREES
1077 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1078 #endif
1079
1080 dst_free(new);
1081 }
1082
1083 dst_release(dst_orig);
1084 return new ? new : ERR_PTR(-ENOMEM);
1085 }
1086
1087 /*
1088 * Destination cache support functions
1089 */
1090
1091 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1092 {
1093 struct rt6_info *rt;
1094
1095 rt = (struct rt6_info *) dst;
1096
1097 /* All IPV6 dsts are created with ->obsolete set to the value
1098 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1099 * into this function always.
1100 */
1101 if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
1102 return NULL;
1103
1104 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1105 return NULL;
1106
1107 if (rt6_check_expired(rt))
1108 return NULL;
1109
1110 return dst;
1111 }
1112
1113 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1114 {
1115 struct rt6_info *rt = (struct rt6_info *) dst;
1116
1117 if (rt) {
1118 if (rt->rt6i_flags & RTF_CACHE) {
1119 if (rt6_check_expired(rt)) {
1120 ip6_del_rt(rt);
1121 dst = NULL;
1122 }
1123 } else {
1124 dst_release(dst);
1125 dst = NULL;
1126 }
1127 }
1128 return dst;
1129 }
1130
1131 static void ip6_link_failure(struct sk_buff *skb)
1132 {
1133 struct rt6_info *rt;
1134
1135 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1136
1137 rt = (struct rt6_info *) skb_dst(skb);
1138 if (rt) {
1139 if (rt->rt6i_flags & RTF_CACHE) {
1140 dst_hold(&rt->dst);
1141 if (ip6_del_rt(rt))
1142 dst_free(&rt->dst);
1143 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1144 rt->rt6i_node->fn_sernum = -1;
1145 }
1146 }
1147 }
1148
1149 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1150 struct sk_buff *skb, u32 mtu)
1151 {
1152 struct rt6_info *rt6 = (struct rt6_info*)dst;
1153
1154 dst_confirm(dst);
1155 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1156 struct net *net = dev_net(dst->dev);
1157
1158 rt6->rt6i_flags |= RTF_MODIFIED;
1159 if (mtu < IPV6_MIN_MTU) {
1160 u32 features = dst_metric(dst, RTAX_FEATURES);
1161 mtu = IPV6_MIN_MTU;
1162 features |= RTAX_FEATURE_ALLFRAG;
1163 dst_metric_set(dst, RTAX_FEATURES, features);
1164 }
1165 dst_metric_set(dst, RTAX_MTU, mtu);
1166 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1167 }
1168 }
1169
1170 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1171 int oif, u32 mark)
1172 {
1173 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1174 struct dst_entry *dst;
1175 struct flowi6 fl6;
1176
1177 memset(&fl6, 0, sizeof(fl6));
1178 fl6.flowi6_oif = oif;
1179 fl6.flowi6_mark = mark;
1180 fl6.daddr = iph->daddr;
1181 fl6.saddr = iph->saddr;
1182 fl6.flowlabel = ip6_flowinfo(iph);
1183
1184 dst = ip6_route_output(net, NULL, &fl6);
1185 if (!dst->error)
1186 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1187 dst_release(dst);
1188 }
1189 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1190
1191 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1192 {
1193 ip6_update_pmtu(skb, sock_net(sk), mtu,
1194 sk->sk_bound_dev_if, sk->sk_mark);
1195 }
1196 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1197
1198 /* Handle redirects */
1199 struct ip6rd_flowi {
1200 struct flowi6 fl6;
1201 struct in6_addr gateway;
1202 };
1203
1204 static struct rt6_info *__ip6_route_redirect(struct net *net,
1205 struct fib6_table *table,
1206 struct flowi6 *fl6,
1207 int flags)
1208 {
1209 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1210 struct rt6_info *rt;
1211 struct fib6_node *fn;
1212
1213 /* Get the "current" route for this destination and
1214 * check if the redirect has come from approriate router.
1215 *
1216 * RFC 4861 specifies that redirects should only be
1217 * accepted if they come from the nexthop to the target.
1218 * Due to the way the routes are chosen, this notion
1219 * is a bit fuzzy and one might need to check all possible
1220 * routes.
1221 */
1222
1223 read_lock_bh(&table->tb6_lock);
1224 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1225 restart:
1226 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1227 if (rt6_check_expired(rt))
1228 continue;
1229 if (rt->dst.error)
1230 break;
1231 if (!(rt->rt6i_flags & RTF_GATEWAY))
1232 continue;
1233 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1234 continue;
1235 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1236 continue;
1237 break;
1238 }
1239
1240 if (!rt)
1241 rt = net->ipv6.ip6_null_entry;
1242 else if (rt->dst.error) {
1243 rt = net->ipv6.ip6_null_entry;
1244 goto out;
1245 }
1246 BACKTRACK(net, &fl6->saddr);
1247 out:
1248 dst_hold(&rt->dst);
1249
1250 read_unlock_bh(&table->tb6_lock);
1251
1252 return rt;
1253 };
1254
1255 static struct dst_entry *ip6_route_redirect(struct net *net,
1256 const struct flowi6 *fl6,
1257 const struct in6_addr *gateway)
1258 {
1259 int flags = RT6_LOOKUP_F_HAS_SADDR;
1260 struct ip6rd_flowi rdfl;
1261
1262 rdfl.fl6 = *fl6;
1263 rdfl.gateway = *gateway;
1264
1265 return fib6_rule_lookup(net, &rdfl.fl6,
1266 flags, __ip6_route_redirect);
1267 }
1268
1269 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1270 {
1271 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1272 struct dst_entry *dst;
1273 struct flowi6 fl6;
1274
1275 memset(&fl6, 0, sizeof(fl6));
1276 fl6.flowi6_oif = oif;
1277 fl6.flowi6_mark = mark;
1278 fl6.daddr = iph->daddr;
1279 fl6.saddr = iph->saddr;
1280 fl6.flowlabel = ip6_flowinfo(iph);
1281
1282 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1283 rt6_do_redirect(dst, NULL, skb);
1284 dst_release(dst);
1285 }
1286 EXPORT_SYMBOL_GPL(ip6_redirect);
1287
1288 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1289 u32 mark)
1290 {
1291 const struct ipv6hdr *iph = ipv6_hdr(skb);
1292 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1293 struct dst_entry *dst;
1294 struct flowi6 fl6;
1295
1296 memset(&fl6, 0, sizeof(fl6));
1297 fl6.flowi6_oif = oif;
1298 fl6.flowi6_mark = mark;
1299 fl6.daddr = msg->dest;
1300 fl6.saddr = iph->daddr;
1301
1302 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1303 rt6_do_redirect(dst, NULL, skb);
1304 dst_release(dst);
1305 }
1306
1307 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1308 {
1309 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1310 }
1311 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1312
1313 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1314 {
1315 struct net_device *dev = dst->dev;
1316 unsigned int mtu = dst_mtu(dst);
1317 struct net *net = dev_net(dev);
1318
1319 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1320
1321 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1322 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1323
1324 /*
1325 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1326 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1327 * IPV6_MAXPLEN is also valid and means: "any MSS,
1328 * rely only on pmtu discovery"
1329 */
1330 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1331 mtu = IPV6_MAXPLEN;
1332 return mtu;
1333 }
1334
1335 static unsigned int ip6_mtu(const struct dst_entry *dst)
1336 {
1337 struct inet6_dev *idev;
1338 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1339
1340 if (mtu)
1341 goto out;
1342
1343 mtu = IPV6_MIN_MTU;
1344
1345 rcu_read_lock();
1346 idev = __in6_dev_get(dst->dev);
1347 if (idev)
1348 mtu = idev->cnf.mtu6;
1349 rcu_read_unlock();
1350
1351 out:
1352 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1353 }
1354
1355 static struct dst_entry *icmp6_dst_gc_list;
1356 static DEFINE_SPINLOCK(icmp6_dst_lock);
1357
1358 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1359 struct flowi6 *fl6)
1360 {
1361 struct dst_entry *dst;
1362 struct rt6_info *rt;
1363 struct inet6_dev *idev = in6_dev_get(dev);
1364 struct net *net = dev_net(dev);
1365
1366 if (unlikely(!idev))
1367 return ERR_PTR(-ENODEV);
1368
1369 rt = ip6_dst_alloc(net, dev, 0, NULL);
1370 if (unlikely(!rt)) {
1371 in6_dev_put(idev);
1372 dst = ERR_PTR(-ENOMEM);
1373 goto out;
1374 }
1375
1376 rt->dst.flags |= DST_HOST;
1377 rt->dst.output = ip6_output;
1378 atomic_set(&rt->dst.__refcnt, 1);
1379 rt->rt6i_gateway = fl6->daddr;
1380 rt->rt6i_dst.addr = fl6->daddr;
1381 rt->rt6i_dst.plen = 128;
1382 rt->rt6i_idev = idev;
1383 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1384
1385 spin_lock_bh(&icmp6_dst_lock);
1386 rt->dst.next = icmp6_dst_gc_list;
1387 icmp6_dst_gc_list = &rt->dst;
1388 spin_unlock_bh(&icmp6_dst_lock);
1389
1390 fib6_force_start_gc(net);
1391
1392 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1393
1394 out:
1395 return dst;
1396 }
1397
1398 int icmp6_dst_gc(void)
1399 {
1400 struct dst_entry *dst, **pprev;
1401 int more = 0;
1402
1403 spin_lock_bh(&icmp6_dst_lock);
1404 pprev = &icmp6_dst_gc_list;
1405
1406 while ((dst = *pprev) != NULL) {
1407 if (!atomic_read(&dst->__refcnt)) {
1408 *pprev = dst->next;
1409 dst_free(dst);
1410 } else {
1411 pprev = &dst->next;
1412 ++more;
1413 }
1414 }
1415
1416 spin_unlock_bh(&icmp6_dst_lock);
1417
1418 return more;
1419 }
1420
1421 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1422 void *arg)
1423 {
1424 struct dst_entry *dst, **pprev;
1425
1426 spin_lock_bh(&icmp6_dst_lock);
1427 pprev = &icmp6_dst_gc_list;
1428 while ((dst = *pprev) != NULL) {
1429 struct rt6_info *rt = (struct rt6_info *) dst;
1430 if (func(rt, arg)) {
1431 *pprev = dst->next;
1432 dst_free(dst);
1433 } else {
1434 pprev = &dst->next;
1435 }
1436 }
1437 spin_unlock_bh(&icmp6_dst_lock);
1438 }
1439
1440 static int ip6_dst_gc(struct dst_ops *ops)
1441 {
1442 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1443 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1444 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1445 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1446 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1447 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1448 int entries;
1449
1450 entries = dst_entries_get_fast(ops);
1451 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1452 entries <= rt_max_size)
1453 goto out;
1454
1455 net->ipv6.ip6_rt_gc_expire++;
1456 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1457 entries = dst_entries_get_slow(ops);
1458 if (entries < ops->gc_thresh)
1459 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1460 out:
1461 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1462 return entries > rt_max_size;
1463 }
1464
1465 /*
1466 *
1467 */
1468
1469 int ip6_route_add(struct fib6_config *cfg)
1470 {
1471 int err;
1472 struct net *net = cfg->fc_nlinfo.nl_net;
1473 struct rt6_info *rt = NULL;
1474 struct net_device *dev = NULL;
1475 struct inet6_dev *idev = NULL;
1476 struct fib6_table *table;
1477 int addr_type;
1478
1479 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1480 return -EINVAL;
1481 #ifndef CONFIG_IPV6_SUBTREES
1482 if (cfg->fc_src_len)
1483 return -EINVAL;
1484 #endif
1485 if (cfg->fc_ifindex) {
1486 err = -ENODEV;
1487 dev = dev_get_by_index(net, cfg->fc_ifindex);
1488 if (!dev)
1489 goto out;
1490 idev = in6_dev_get(dev);
1491 if (!idev)
1492 goto out;
1493 }
1494
1495 if (cfg->fc_metric == 0)
1496 cfg->fc_metric = IP6_RT_PRIO_USER;
1497
1498 err = -ENOBUFS;
1499 if (cfg->fc_nlinfo.nlh &&
1500 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1501 table = fib6_get_table(net, cfg->fc_table);
1502 if (!table) {
1503 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1504 table = fib6_new_table(net, cfg->fc_table);
1505 }
1506 } else {
1507 table = fib6_new_table(net, cfg->fc_table);
1508 }
1509
1510 if (!table)
1511 goto out;
1512
1513 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1514
1515 if (!rt) {
1516 err = -ENOMEM;
1517 goto out;
1518 }
1519
1520 if (cfg->fc_flags & RTF_EXPIRES)
1521 rt6_set_expires(rt, jiffies +
1522 clock_t_to_jiffies(cfg->fc_expires));
1523 else
1524 rt6_clean_expires(rt);
1525
1526 if (cfg->fc_protocol == RTPROT_UNSPEC)
1527 cfg->fc_protocol = RTPROT_BOOT;
1528 rt->rt6i_protocol = cfg->fc_protocol;
1529
1530 addr_type = ipv6_addr_type(&cfg->fc_dst);
1531
1532 if (addr_type & IPV6_ADDR_MULTICAST)
1533 rt->dst.input = ip6_mc_input;
1534 else if (cfg->fc_flags & RTF_LOCAL)
1535 rt->dst.input = ip6_input;
1536 else
1537 rt->dst.input = ip6_forward;
1538
1539 rt->dst.output = ip6_output;
1540
1541 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1542 rt->rt6i_dst.plen = cfg->fc_dst_len;
1543 if (rt->rt6i_dst.plen == 128) {
1544 rt->dst.flags |= DST_HOST;
1545 dst_metrics_set_force_overwrite(&rt->dst);
1546 }
1547
1548 #ifdef CONFIG_IPV6_SUBTREES
1549 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1550 rt->rt6i_src.plen = cfg->fc_src_len;
1551 #endif
1552
1553 rt->rt6i_metric = cfg->fc_metric;
1554
1555 /* We cannot add true routes via loopback here,
1556 they would result in kernel looping; promote them to reject routes
1557 */
1558 if ((cfg->fc_flags & RTF_REJECT) ||
1559 (dev && (dev->flags & IFF_LOOPBACK) &&
1560 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1561 !(cfg->fc_flags & RTF_LOCAL))) {
1562 /* hold loopback dev/idev if we haven't done so. */
1563 if (dev != net->loopback_dev) {
1564 if (dev) {
1565 dev_put(dev);
1566 in6_dev_put(idev);
1567 }
1568 dev = net->loopback_dev;
1569 dev_hold(dev);
1570 idev = in6_dev_get(dev);
1571 if (!idev) {
1572 err = -ENODEV;
1573 goto out;
1574 }
1575 }
1576 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1577 switch (cfg->fc_type) {
1578 case RTN_BLACKHOLE:
1579 rt->dst.error = -EINVAL;
1580 rt->dst.output = dst_discard_sk;
1581 rt->dst.input = dst_discard;
1582 break;
1583 case RTN_PROHIBIT:
1584 rt->dst.error = -EACCES;
1585 rt->dst.output = ip6_pkt_prohibit_out;
1586 rt->dst.input = ip6_pkt_prohibit;
1587 break;
1588 case RTN_THROW:
1589 default:
1590 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1591 : -ENETUNREACH;
1592 rt->dst.output = ip6_pkt_discard_out;
1593 rt->dst.input = ip6_pkt_discard;
1594 break;
1595 }
1596 goto install_route;
1597 }
1598
1599 if (cfg->fc_flags & RTF_GATEWAY) {
1600 const struct in6_addr *gw_addr;
1601 int gwa_type;
1602
1603 gw_addr = &cfg->fc_gateway;
1604 rt->rt6i_gateway = *gw_addr;
1605 gwa_type = ipv6_addr_type(gw_addr);
1606
1607 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1608 struct rt6_info *grt;
1609
1610 /* IPv6 strictly inhibits using not link-local
1611 addresses as nexthop address.
1612 Otherwise, router will not able to send redirects.
1613 It is very good, but in some (rare!) circumstances
1614 (SIT, PtP, NBMA NOARP links) it is handy to allow
1615 some exceptions. --ANK
1616 */
1617 err = -EINVAL;
1618 if (!(gwa_type & IPV6_ADDR_UNICAST))
1619 goto out;
1620
1621 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1622
1623 err = -EHOSTUNREACH;
1624 if (!grt)
1625 goto out;
1626 if (dev) {
1627 if (dev != grt->dst.dev) {
1628 ip6_rt_put(grt);
1629 goto out;
1630 }
1631 } else {
1632 dev = grt->dst.dev;
1633 idev = grt->rt6i_idev;
1634 dev_hold(dev);
1635 in6_dev_hold(grt->rt6i_idev);
1636 }
1637 if (!(grt->rt6i_flags & RTF_GATEWAY))
1638 err = 0;
1639 ip6_rt_put(grt);
1640
1641 if (err)
1642 goto out;
1643 }
1644 err = -EINVAL;
1645 if (!dev || (dev->flags & IFF_LOOPBACK))
1646 goto out;
1647 }
1648
1649 err = -ENODEV;
1650 if (!dev)
1651 goto out;
1652
1653 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1654 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1655 err = -EINVAL;
1656 goto out;
1657 }
1658 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1659 rt->rt6i_prefsrc.plen = 128;
1660 } else
1661 rt->rt6i_prefsrc.plen = 0;
1662
1663 rt->rt6i_flags = cfg->fc_flags;
1664
1665 install_route:
1666 rt->dst.dev = dev;
1667 rt->rt6i_idev = idev;
1668 rt->rt6i_table = table;
1669
1670 cfg->fc_nlinfo.nl_net = dev_net(dev);
1671
1672 return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
1673
1674 out:
1675 if (dev)
1676 dev_put(dev);
1677 if (idev)
1678 in6_dev_put(idev);
1679 if (rt)
1680 dst_free(&rt->dst);
1681 return err;
1682 }
1683
1684 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1685 {
1686 int err;
1687 struct fib6_table *table;
1688 struct net *net = dev_net(rt->dst.dev);
1689
1690 if (rt == net->ipv6.ip6_null_entry) {
1691 err = -ENOENT;
1692 goto out;
1693 }
1694
1695 table = rt->rt6i_table;
1696 write_lock_bh(&table->tb6_lock);
1697 err = fib6_del(rt, info);
1698 write_unlock_bh(&table->tb6_lock);
1699
1700 out:
1701 ip6_rt_put(rt);
1702 return err;
1703 }
1704
1705 int ip6_del_rt(struct rt6_info *rt)
1706 {
1707 struct nl_info info = {
1708 .nl_net = dev_net(rt->dst.dev),
1709 };
1710 return __ip6_del_rt(rt, &info);
1711 }
1712
1713 static int ip6_route_del(struct fib6_config *cfg)
1714 {
1715 struct fib6_table *table;
1716 struct fib6_node *fn;
1717 struct rt6_info *rt;
1718 int err = -ESRCH;
1719
1720 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1721 if (!table)
1722 return err;
1723
1724 read_lock_bh(&table->tb6_lock);
1725
1726 fn = fib6_locate(&table->tb6_root,
1727 &cfg->fc_dst, cfg->fc_dst_len,
1728 &cfg->fc_src, cfg->fc_src_len);
1729
1730 if (fn) {
1731 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1732 if (cfg->fc_ifindex &&
1733 (!rt->dst.dev ||
1734 rt->dst.dev->ifindex != cfg->fc_ifindex))
1735 continue;
1736 if (cfg->fc_flags & RTF_GATEWAY &&
1737 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1738 continue;
1739 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1740 continue;
1741 dst_hold(&rt->dst);
1742 read_unlock_bh(&table->tb6_lock);
1743
1744 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1745 }
1746 }
1747 read_unlock_bh(&table->tb6_lock);
1748
1749 return err;
1750 }
1751
1752 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1753 {
1754 struct net *net = dev_net(skb->dev);
1755 struct netevent_redirect netevent;
1756 struct rt6_info *rt, *nrt = NULL;
1757 struct ndisc_options ndopts;
1758 struct inet6_dev *in6_dev;
1759 struct neighbour *neigh;
1760 struct rd_msg *msg;
1761 int optlen, on_link;
1762 u8 *lladdr;
1763
1764 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1765 optlen -= sizeof(*msg);
1766
1767 if (optlen < 0) {
1768 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1769 return;
1770 }
1771
1772 msg = (struct rd_msg *)icmp6_hdr(skb);
1773
1774 if (ipv6_addr_is_multicast(&msg->dest)) {
1775 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1776 return;
1777 }
1778
1779 on_link = 0;
1780 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1781 on_link = 1;
1782 } else if (ipv6_addr_type(&msg->target) !=
1783 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1784 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1785 return;
1786 }
1787
1788 in6_dev = __in6_dev_get(skb->dev);
1789 if (!in6_dev)
1790 return;
1791 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1792 return;
1793
1794 /* RFC2461 8.1:
1795 * The IP source address of the Redirect MUST be the same as the current
1796 * first-hop router for the specified ICMP Destination Address.
1797 */
1798
1799 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1800 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1801 return;
1802 }
1803
1804 lladdr = NULL;
1805 if (ndopts.nd_opts_tgt_lladdr) {
1806 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1807 skb->dev);
1808 if (!lladdr) {
1809 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1810 return;
1811 }
1812 }
1813
1814 rt = (struct rt6_info *) dst;
1815 if (rt == net->ipv6.ip6_null_entry) {
1816 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1817 return;
1818 }
1819
1820 /* Redirect received -> path was valid.
1821 * Look, redirects are sent only in response to data packets,
1822 * so that this nexthop apparently is reachable. --ANK
1823 */
1824 dst_confirm(&rt->dst);
1825
1826 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1827 if (!neigh)
1828 return;
1829
1830 /*
1831 * We have finally decided to accept it.
1832 */
1833
1834 neigh_update(neigh, lladdr, NUD_STALE,
1835 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1836 NEIGH_UPDATE_F_OVERRIDE|
1837 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1838 NEIGH_UPDATE_F_ISROUTER))
1839 );
1840
1841 nrt = ip6_rt_copy(rt, &msg->dest);
1842 if (!nrt)
1843 goto out;
1844
1845 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1846 if (on_link)
1847 nrt->rt6i_flags &= ~RTF_GATEWAY;
1848
1849 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1850
1851 if (ip6_ins_rt(nrt))
1852 goto out;
1853
1854 netevent.old = &rt->dst;
1855 netevent.new = &nrt->dst;
1856 netevent.daddr = &msg->dest;
1857 netevent.neigh = neigh;
1858 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1859
1860 if (rt->rt6i_flags & RTF_CACHE) {
1861 rt = (struct rt6_info *) dst_clone(&rt->dst);
1862 ip6_del_rt(rt);
1863 }
1864
1865 out:
1866 neigh_release(neigh);
1867 }
1868
1869 /*
1870 * Misc support functions
1871 */
1872
1873 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1874 const struct in6_addr *dest)
1875 {
1876 struct net *net = dev_net(ort->dst.dev);
1877 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1878 ort->rt6i_table);
1879
1880 if (rt) {
1881 rt->dst.input = ort->dst.input;
1882 rt->dst.output = ort->dst.output;
1883 rt->dst.flags |= DST_HOST;
1884
1885 rt->rt6i_dst.addr = *dest;
1886 rt->rt6i_dst.plen = 128;
1887 dst_copy_metrics(&rt->dst, &ort->dst);
1888 rt->dst.error = ort->dst.error;
1889 rt->rt6i_idev = ort->rt6i_idev;
1890 if (rt->rt6i_idev)
1891 in6_dev_hold(rt->rt6i_idev);
1892 rt->dst.lastuse = jiffies;
1893
1894 if (ort->rt6i_flags & RTF_GATEWAY)
1895 rt->rt6i_gateway = ort->rt6i_gateway;
1896 else
1897 rt->rt6i_gateway = *dest;
1898 rt->rt6i_flags = ort->rt6i_flags;
1899 rt6_set_from(rt, ort);
1900 rt->rt6i_metric = 0;
1901
1902 #ifdef CONFIG_IPV6_SUBTREES
1903 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1904 #endif
1905 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1906 rt->rt6i_table = ort->rt6i_table;
1907 }
1908 return rt;
1909 }
1910
1911 #ifdef CONFIG_IPV6_ROUTE_INFO
1912 static struct rt6_info *rt6_get_route_info(struct net *net,
1913 const struct in6_addr *prefix, int prefixlen,
1914 const struct in6_addr *gwaddr, int ifindex)
1915 {
1916 struct fib6_node *fn;
1917 struct rt6_info *rt = NULL;
1918 struct fib6_table *table;
1919
1920 table = fib6_get_table(net, RT6_TABLE_INFO);
1921 if (!table)
1922 return NULL;
1923
1924 read_lock_bh(&table->tb6_lock);
1925 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1926 if (!fn)
1927 goto out;
1928
1929 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1930 if (rt->dst.dev->ifindex != ifindex)
1931 continue;
1932 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1933 continue;
1934 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1935 continue;
1936 dst_hold(&rt->dst);
1937 break;
1938 }
1939 out:
1940 read_unlock_bh(&table->tb6_lock);
1941 return rt;
1942 }
1943
1944 static struct rt6_info *rt6_add_route_info(struct net *net,
1945 const struct in6_addr *prefix, int prefixlen,
1946 const struct in6_addr *gwaddr, int ifindex,
1947 unsigned int pref)
1948 {
1949 struct fib6_config cfg = {
1950 .fc_table = RT6_TABLE_INFO,
1951 .fc_metric = IP6_RT_PRIO_USER,
1952 .fc_ifindex = ifindex,
1953 .fc_dst_len = prefixlen,
1954 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1955 RTF_UP | RTF_PREF(pref),
1956 .fc_nlinfo.portid = 0,
1957 .fc_nlinfo.nlh = NULL,
1958 .fc_nlinfo.nl_net = net,
1959 };
1960
1961 cfg.fc_dst = *prefix;
1962 cfg.fc_gateway = *gwaddr;
1963
1964 /* We should treat it as a default route if prefix length is 0. */
1965 if (!prefixlen)
1966 cfg.fc_flags |= RTF_DEFAULT;
1967
1968 ip6_route_add(&cfg);
1969
1970 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1971 }
1972 #endif
1973
1974 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1975 {
1976 struct rt6_info *rt;
1977 struct fib6_table *table;
1978
1979 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1980 if (!table)
1981 return NULL;
1982
1983 read_lock_bh(&table->tb6_lock);
1984 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1985 if (dev == rt->dst.dev &&
1986 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1987 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1988 break;
1989 }
1990 if (rt)
1991 dst_hold(&rt->dst);
1992 read_unlock_bh(&table->tb6_lock);
1993 return rt;
1994 }
1995
1996 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1997 struct net_device *dev,
1998 unsigned int pref)
1999 {
2000 struct fib6_config cfg = {
2001 .fc_table = RT6_TABLE_DFLT,
2002 .fc_metric = IP6_RT_PRIO_USER,
2003 .fc_ifindex = dev->ifindex,
2004 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2005 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2006 .fc_nlinfo.portid = 0,
2007 .fc_nlinfo.nlh = NULL,
2008 .fc_nlinfo.nl_net = dev_net(dev),
2009 };
2010
2011 cfg.fc_gateway = *gwaddr;
2012
2013 ip6_route_add(&cfg);
2014
2015 return rt6_get_dflt_router(gwaddr, dev);
2016 }
2017
2018 void rt6_purge_dflt_routers(struct net *net)
2019 {
2020 struct rt6_info *rt;
2021 struct fib6_table *table;
2022
2023 /* NOTE: Keep consistent with rt6_get_dflt_router */
2024 table = fib6_get_table(net, RT6_TABLE_DFLT);
2025 if (!table)
2026 return;
2027
2028 restart:
2029 read_lock_bh(&table->tb6_lock);
2030 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2031 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2032 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2033 dst_hold(&rt->dst);
2034 read_unlock_bh(&table->tb6_lock);
2035 ip6_del_rt(rt);
2036 goto restart;
2037 }
2038 }
2039 read_unlock_bh(&table->tb6_lock);
2040 }
2041
2042 static void rtmsg_to_fib6_config(struct net *net,
2043 struct in6_rtmsg *rtmsg,
2044 struct fib6_config *cfg)
2045 {
2046 memset(cfg, 0, sizeof(*cfg));
2047
2048 cfg->fc_table = RT6_TABLE_MAIN;
2049 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2050 cfg->fc_metric = rtmsg->rtmsg_metric;
2051 cfg->fc_expires = rtmsg->rtmsg_info;
2052 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2053 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2054 cfg->fc_flags = rtmsg->rtmsg_flags;
2055
2056 cfg->fc_nlinfo.nl_net = net;
2057
2058 cfg->fc_dst = rtmsg->rtmsg_dst;
2059 cfg->fc_src = rtmsg->rtmsg_src;
2060 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2061 }
2062
2063 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2064 {
2065 struct fib6_config cfg;
2066 struct in6_rtmsg rtmsg;
2067 int err;
2068
2069 switch(cmd) {
2070 case SIOCADDRT: /* Add a route */
2071 case SIOCDELRT: /* Delete a route */
2072 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2073 return -EPERM;
2074 err = copy_from_user(&rtmsg, arg,
2075 sizeof(struct in6_rtmsg));
2076 if (err)
2077 return -EFAULT;
2078
2079 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2080
2081 rtnl_lock();
2082 switch (cmd) {
2083 case SIOCADDRT:
2084 err = ip6_route_add(&cfg);
2085 break;
2086 case SIOCDELRT:
2087 err = ip6_route_del(&cfg);
2088 break;
2089 default:
2090 err = -EINVAL;
2091 }
2092 rtnl_unlock();
2093
2094 return err;
2095 }
2096
2097 return -EINVAL;
2098 }
2099
2100 /*
2101 * Drop the packet on the floor
2102 */
2103
2104 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2105 {
2106 int type;
2107 struct dst_entry *dst = skb_dst(skb);
2108 switch (ipstats_mib_noroutes) {
2109 case IPSTATS_MIB_INNOROUTES:
2110 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2111 if (type == IPV6_ADDR_ANY) {
2112 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2113 IPSTATS_MIB_INADDRERRORS);
2114 break;
2115 }
2116 /* FALLTHROUGH */
2117 case IPSTATS_MIB_OUTNOROUTES:
2118 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2119 ipstats_mib_noroutes);
2120 break;
2121 }
2122 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2123 kfree_skb(skb);
2124 return 0;
2125 }
2126
2127 static int ip6_pkt_discard(struct sk_buff *skb)
2128 {
2129 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2130 }
2131
2132 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2133 {
2134 skb->dev = skb_dst(skb)->dev;
2135 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2136 }
2137
2138 static int ip6_pkt_prohibit(struct sk_buff *skb)
2139 {
2140 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2141 }
2142
2143 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2144 {
2145 skb->dev = skb_dst(skb)->dev;
2146 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2147 }
2148
2149 /*
2150 * Allocate a dst for local (unicast / anycast) address.
2151 */
2152
2153 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2154 const struct in6_addr *addr,
2155 bool anycast)
2156 {
2157 struct net *net = dev_net(idev->dev);
2158 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2159 DST_NOCOUNT, NULL);
2160 if (!rt)
2161 return ERR_PTR(-ENOMEM);
2162
2163 in6_dev_hold(idev);
2164
2165 rt->dst.flags |= DST_HOST;
2166 rt->dst.input = ip6_input;
2167 rt->dst.output = ip6_output;
2168 rt->rt6i_idev = idev;
2169
2170 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2171 if (anycast)
2172 rt->rt6i_flags |= RTF_ANYCAST;
2173 else
2174 rt->rt6i_flags |= RTF_LOCAL;
2175
2176 rt->rt6i_gateway = *addr;
2177 rt->rt6i_dst.addr = *addr;
2178 rt->rt6i_dst.plen = 128;
2179 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2180
2181 atomic_set(&rt->dst.__refcnt, 1);
2182
2183 return rt;
2184 }
2185
2186 int ip6_route_get_saddr(struct net *net,
2187 struct rt6_info *rt,
2188 const struct in6_addr *daddr,
2189 unsigned int prefs,
2190 struct in6_addr *saddr)
2191 {
2192 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2193 int err = 0;
2194 if (rt->rt6i_prefsrc.plen)
2195 *saddr = rt->rt6i_prefsrc.addr;
2196 else
2197 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2198 daddr, prefs, saddr);
2199 return err;
2200 }
2201
2202 /* remove deleted ip from prefsrc entries */
2203 struct arg_dev_net_ip {
2204 struct net_device *dev;
2205 struct net *net;
2206 struct in6_addr *addr;
2207 };
2208
2209 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2210 {
2211 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2212 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2213 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2214
2215 if (((void *)rt->dst.dev == dev || !dev) &&
2216 rt != net->ipv6.ip6_null_entry &&
2217 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2218 /* remove prefsrc entry */
2219 rt->rt6i_prefsrc.plen = 0;
2220 }
2221 return 0;
2222 }
2223
2224 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2225 {
2226 struct net *net = dev_net(ifp->idev->dev);
2227 struct arg_dev_net_ip adni = {
2228 .dev = ifp->idev->dev,
2229 .net = net,
2230 .addr = &ifp->addr,
2231 };
2232 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2233 }
2234
2235 struct arg_dev_net {
2236 struct net_device *dev;
2237 struct net *net;
2238 };
2239
2240 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2241 {
2242 const struct arg_dev_net *adn = arg;
2243 const struct net_device *dev = adn->dev;
2244
2245 if ((rt->dst.dev == dev || !dev) &&
2246 rt != adn->net->ipv6.ip6_null_entry)
2247 return -1;
2248
2249 return 0;
2250 }
2251
2252 void rt6_ifdown(struct net *net, struct net_device *dev)
2253 {
2254 struct arg_dev_net adn = {
2255 .dev = dev,
2256 .net = net,
2257 };
2258
2259 fib6_clean_all(net, fib6_ifdown, &adn);
2260 icmp6_clean_all(fib6_ifdown, &adn);
2261 }
2262
2263 struct rt6_mtu_change_arg {
2264 struct net_device *dev;
2265 unsigned int mtu;
2266 };
2267
2268 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2269 {
2270 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2271 struct inet6_dev *idev;
2272
2273 /* In IPv6 pmtu discovery is not optional,
2274 so that RTAX_MTU lock cannot disable it.
2275 We still use this lock to block changes
2276 caused by addrconf/ndisc.
2277 */
2278
2279 idev = __in6_dev_get(arg->dev);
2280 if (!idev)
2281 return 0;
2282
2283 /* For administrative MTU increase, there is no way to discover
2284 IPv6 PMTU increase, so PMTU increase should be updated here.
2285 Since RFC 1981 doesn't include administrative MTU increase
2286 update PMTU increase is a MUST. (i.e. jumbo frame)
2287 */
2288 /*
2289 If new MTU is less than route PMTU, this new MTU will be the
2290 lowest MTU in the path, update the route PMTU to reflect PMTU
2291 decreases; if new MTU is greater than route PMTU, and the
2292 old MTU is the lowest MTU in the path, update the route PMTU
2293 to reflect the increase. In this case if the other nodes' MTU
2294 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2295 PMTU discouvery.
2296 */
2297 if (rt->dst.dev == arg->dev &&
2298 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2299 (dst_mtu(&rt->dst) >= arg->mtu ||
2300 (dst_mtu(&rt->dst) < arg->mtu &&
2301 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2302 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2303 }
2304 return 0;
2305 }
2306
2307 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2308 {
2309 struct rt6_mtu_change_arg arg = {
2310 .dev = dev,
2311 .mtu = mtu,
2312 };
2313
2314 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2315 }
2316
2317 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2318 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2319 [RTA_OIF] = { .type = NLA_U32 },
2320 [RTA_IIF] = { .type = NLA_U32 },
2321 [RTA_PRIORITY] = { .type = NLA_U32 },
2322 [RTA_METRICS] = { .type = NLA_NESTED },
2323 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2324 };
2325
2326 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2327 struct fib6_config *cfg)
2328 {
2329 struct rtmsg *rtm;
2330 struct nlattr *tb[RTA_MAX+1];
2331 int err;
2332
2333 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2334 if (err < 0)
2335 goto errout;
2336
2337 err = -EINVAL;
2338 rtm = nlmsg_data(nlh);
2339 memset(cfg, 0, sizeof(*cfg));
2340
2341 cfg->fc_table = rtm->rtm_table;
2342 cfg->fc_dst_len = rtm->rtm_dst_len;
2343 cfg->fc_src_len = rtm->rtm_src_len;
2344 cfg->fc_flags = RTF_UP;
2345 cfg->fc_protocol = rtm->rtm_protocol;
2346 cfg->fc_type = rtm->rtm_type;
2347
2348 if (rtm->rtm_type == RTN_UNREACHABLE ||
2349 rtm->rtm_type == RTN_BLACKHOLE ||
2350 rtm->rtm_type == RTN_PROHIBIT ||
2351 rtm->rtm_type == RTN_THROW)
2352 cfg->fc_flags |= RTF_REJECT;
2353
2354 if (rtm->rtm_type == RTN_LOCAL)
2355 cfg->fc_flags |= RTF_LOCAL;
2356
2357 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2358 cfg->fc_nlinfo.nlh = nlh;
2359 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2360
2361 if (tb[RTA_GATEWAY]) {
2362 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2363 cfg->fc_flags |= RTF_GATEWAY;
2364 }
2365
2366 if (tb[RTA_DST]) {
2367 int plen = (rtm->rtm_dst_len + 7) >> 3;
2368
2369 if (nla_len(tb[RTA_DST]) < plen)
2370 goto errout;
2371
2372 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2373 }
2374
2375 if (tb[RTA_SRC]) {
2376 int plen = (rtm->rtm_src_len + 7) >> 3;
2377
2378 if (nla_len(tb[RTA_SRC]) < plen)
2379 goto errout;
2380
2381 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2382 }
2383
2384 if (tb[RTA_PREFSRC])
2385 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2386
2387 if (tb[RTA_OIF])
2388 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2389
2390 if (tb[RTA_PRIORITY])
2391 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2392
2393 if (tb[RTA_METRICS]) {
2394 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2395 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2396 }
2397
2398 if (tb[RTA_TABLE])
2399 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2400
2401 if (tb[RTA_MULTIPATH]) {
2402 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2403 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2404 }
2405
2406 err = 0;
2407 errout:
2408 return err;
2409 }
2410
2411 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2412 {
2413 struct fib6_config r_cfg;
2414 struct rtnexthop *rtnh;
2415 int remaining;
2416 int attrlen;
2417 int err = 0, last_err = 0;
2418
2419 beginning:
2420 rtnh = (struct rtnexthop *)cfg->fc_mp;
2421 remaining = cfg->fc_mp_len;
2422
2423 /* Parse a Multipath Entry */
2424 while (rtnh_ok(rtnh, remaining)) {
2425 memcpy(&r_cfg, cfg, sizeof(*cfg));
2426 if (rtnh->rtnh_ifindex)
2427 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2428
2429 attrlen = rtnh_attrlen(rtnh);
2430 if (attrlen > 0) {
2431 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2432
2433 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2434 if (nla) {
2435 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2436 r_cfg.fc_flags |= RTF_GATEWAY;
2437 }
2438 }
2439 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2440 if (err) {
2441 last_err = err;
2442 /* If we are trying to remove a route, do not stop the
2443 * loop when ip6_route_del() fails (because next hop is
2444 * already gone), we should try to remove all next hops.
2445 */
2446 if (add) {
2447 /* If add fails, we should try to delete all
2448 * next hops that have been already added.
2449 */
2450 add = 0;
2451 goto beginning;
2452 }
2453 }
2454 /* Because each route is added like a single route we remove
2455 * this flag after the first nexthop (if there is a collision,
2456 * we have already fail to add the first nexthop:
2457 * fib6_add_rt2node() has reject it).
2458 */
2459 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2460 rtnh = rtnh_next(rtnh, &remaining);
2461 }
2462
2463 return last_err;
2464 }
2465
2466 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2467 {
2468 struct fib6_config cfg;
2469 int err;
2470
2471 err = rtm_to_fib6_config(skb, nlh, &cfg);
2472 if (err < 0)
2473 return err;
2474
2475 if (cfg.fc_mp)
2476 return ip6_route_multipath(&cfg, 0);
2477 else
2478 return ip6_route_del(&cfg);
2479 }
2480
2481 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2482 {
2483 struct fib6_config cfg;
2484 int err;
2485
2486 err = rtm_to_fib6_config(skb, nlh, &cfg);
2487 if (err < 0)
2488 return err;
2489
2490 if (cfg.fc_mp)
2491 return ip6_route_multipath(&cfg, 1);
2492 else
2493 return ip6_route_add(&cfg);
2494 }
2495
2496 static inline size_t rt6_nlmsg_size(void)
2497 {
2498 return NLMSG_ALIGN(sizeof(struct rtmsg))
2499 + nla_total_size(16) /* RTA_SRC */
2500 + nla_total_size(16) /* RTA_DST */
2501 + nla_total_size(16) /* RTA_GATEWAY */
2502 + nla_total_size(16) /* RTA_PREFSRC */
2503 + nla_total_size(4) /* RTA_TABLE */
2504 + nla_total_size(4) /* RTA_IIF */
2505 + nla_total_size(4) /* RTA_OIF */
2506 + nla_total_size(4) /* RTA_PRIORITY */
2507 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2508 + nla_total_size(sizeof(struct rta_cacheinfo));
2509 }
2510
2511 static int rt6_fill_node(struct net *net,
2512 struct sk_buff *skb, struct rt6_info *rt,
2513 struct in6_addr *dst, struct in6_addr *src,
2514 int iif, int type, u32 portid, u32 seq,
2515 int prefix, int nowait, unsigned int flags)
2516 {
2517 struct rtmsg *rtm;
2518 struct nlmsghdr *nlh;
2519 long expires;
2520 u32 table;
2521
2522 if (prefix) { /* user wants prefix routes only */
2523 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2524 /* success since this is not a prefix route */
2525 return 1;
2526 }
2527 }
2528
2529 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2530 if (!nlh)
2531 return -EMSGSIZE;
2532
2533 rtm = nlmsg_data(nlh);
2534 rtm->rtm_family = AF_INET6;
2535 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2536 rtm->rtm_src_len = rt->rt6i_src.plen;
2537 rtm->rtm_tos = 0;
2538 if (rt->rt6i_table)
2539 table = rt->rt6i_table->tb6_id;
2540 else
2541 table = RT6_TABLE_UNSPEC;
2542 rtm->rtm_table = table;
2543 if (nla_put_u32(skb, RTA_TABLE, table))
2544 goto nla_put_failure;
2545 if (rt->rt6i_flags & RTF_REJECT) {
2546 switch (rt->dst.error) {
2547 case -EINVAL:
2548 rtm->rtm_type = RTN_BLACKHOLE;
2549 break;
2550 case -EACCES:
2551 rtm->rtm_type = RTN_PROHIBIT;
2552 break;
2553 case -EAGAIN:
2554 rtm->rtm_type = RTN_THROW;
2555 break;
2556 default:
2557 rtm->rtm_type = RTN_UNREACHABLE;
2558 break;
2559 }
2560 }
2561 else if (rt->rt6i_flags & RTF_LOCAL)
2562 rtm->rtm_type = RTN_LOCAL;
2563 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2564 rtm->rtm_type = RTN_LOCAL;
2565 else
2566 rtm->rtm_type = RTN_UNICAST;
2567 rtm->rtm_flags = 0;
2568 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2569 rtm->rtm_protocol = rt->rt6i_protocol;
2570 if (rt->rt6i_flags & RTF_DYNAMIC)
2571 rtm->rtm_protocol = RTPROT_REDIRECT;
2572 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2573 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2574 rtm->rtm_protocol = RTPROT_RA;
2575 else
2576 rtm->rtm_protocol = RTPROT_KERNEL;
2577 }
2578
2579 if (rt->rt6i_flags & RTF_CACHE)
2580 rtm->rtm_flags |= RTM_F_CLONED;
2581
2582 if (dst) {
2583 if (nla_put(skb, RTA_DST, 16, dst))
2584 goto nla_put_failure;
2585 rtm->rtm_dst_len = 128;
2586 } else if (rtm->rtm_dst_len)
2587 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2588 goto nla_put_failure;
2589 #ifdef CONFIG_IPV6_SUBTREES
2590 if (src) {
2591 if (nla_put(skb, RTA_SRC, 16, src))
2592 goto nla_put_failure;
2593 rtm->rtm_src_len = 128;
2594 } else if (rtm->rtm_src_len &&
2595 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2596 goto nla_put_failure;
2597 #endif
2598 if (iif) {
2599 #ifdef CONFIG_IPV6_MROUTE
2600 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2601 int err = ip6mr_get_route(net, skb, rtm, nowait);
2602 if (err <= 0) {
2603 if (!nowait) {
2604 if (err == 0)
2605 return 0;
2606 goto nla_put_failure;
2607 } else {
2608 if (err == -EMSGSIZE)
2609 goto nla_put_failure;
2610 }
2611 }
2612 } else
2613 #endif
2614 if (nla_put_u32(skb, RTA_IIF, iif))
2615 goto nla_put_failure;
2616 } else if (dst) {
2617 struct in6_addr saddr_buf;
2618 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2619 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2620 goto nla_put_failure;
2621 }
2622
2623 if (rt->rt6i_prefsrc.plen) {
2624 struct in6_addr saddr_buf;
2625 saddr_buf = rt->rt6i_prefsrc.addr;
2626 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2627 goto nla_put_failure;
2628 }
2629
2630 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2631 goto nla_put_failure;
2632
2633 if (rt->rt6i_flags & RTF_GATEWAY) {
2634 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2635 goto nla_put_failure;
2636 }
2637
2638 if (rt->dst.dev &&
2639 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2640 goto nla_put_failure;
2641 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2642 goto nla_put_failure;
2643
2644 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2645
2646 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2647 goto nla_put_failure;
2648
2649 return nlmsg_end(skb, nlh);
2650
2651 nla_put_failure:
2652 nlmsg_cancel(skb, nlh);
2653 return -EMSGSIZE;
2654 }
2655
2656 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2657 {
2658 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2659 int prefix;
2660
2661 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2662 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2663 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2664 } else
2665 prefix = 0;
2666
2667 return rt6_fill_node(arg->net,
2668 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2669 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2670 prefix, 0, NLM_F_MULTI);
2671 }
2672
2673 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2674 {
2675 struct net *net = sock_net(in_skb->sk);
2676 struct nlattr *tb[RTA_MAX+1];
2677 struct rt6_info *rt;
2678 struct sk_buff *skb;
2679 struct rtmsg *rtm;
2680 struct flowi6 fl6;
2681 int err, iif = 0, oif = 0;
2682
2683 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2684 if (err < 0)
2685 goto errout;
2686
2687 err = -EINVAL;
2688 memset(&fl6, 0, sizeof(fl6));
2689
2690 if (tb[RTA_SRC]) {
2691 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2692 goto errout;
2693
2694 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2695 }
2696
2697 if (tb[RTA_DST]) {
2698 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2699 goto errout;
2700
2701 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2702 }
2703
2704 if (tb[RTA_IIF])
2705 iif = nla_get_u32(tb[RTA_IIF]);
2706
2707 if (tb[RTA_OIF])
2708 oif = nla_get_u32(tb[RTA_OIF]);
2709
2710 if (iif) {
2711 struct net_device *dev;
2712 int flags = 0;
2713
2714 dev = __dev_get_by_index(net, iif);
2715 if (!dev) {
2716 err = -ENODEV;
2717 goto errout;
2718 }
2719
2720 fl6.flowi6_iif = iif;
2721
2722 if (!ipv6_addr_any(&fl6.saddr))
2723 flags |= RT6_LOOKUP_F_HAS_SADDR;
2724
2725 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2726 flags);
2727 } else {
2728 fl6.flowi6_oif = oif;
2729
2730 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2731 }
2732
2733 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2734 if (!skb) {
2735 ip6_rt_put(rt);
2736 err = -ENOBUFS;
2737 goto errout;
2738 }
2739
2740 /* Reserve room for dummy headers, this skb can pass
2741 through good chunk of routing engine.
2742 */
2743 skb_reset_mac_header(skb);
2744 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2745
2746 skb_dst_set(skb, &rt->dst);
2747
2748 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2749 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2750 nlh->nlmsg_seq, 0, 0, 0);
2751 if (err < 0) {
2752 kfree_skb(skb);
2753 goto errout;
2754 }
2755
2756 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2757 errout:
2758 return err;
2759 }
2760
2761 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2762 {
2763 struct sk_buff *skb;
2764 struct net *net = info->nl_net;
2765 u32 seq;
2766 int err;
2767
2768 err = -ENOBUFS;
2769 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2770
2771 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2772 if (!skb)
2773 goto errout;
2774
2775 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2776 event, info->portid, seq, 0, 0, 0);
2777 if (err < 0) {
2778 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2779 WARN_ON(err == -EMSGSIZE);
2780 kfree_skb(skb);
2781 goto errout;
2782 }
2783 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2784 info->nlh, gfp_any());
2785 return;
2786 errout:
2787 if (err < 0)
2788 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2789 }
2790
2791 static int ip6_route_dev_notify(struct notifier_block *this,
2792 unsigned long event, void *ptr)
2793 {
2794 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2795 struct net *net = dev_net(dev);
2796
2797 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2798 net->ipv6.ip6_null_entry->dst.dev = dev;
2799 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2800 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2801 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2802 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2803 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2804 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2805 #endif
2806 }
2807
2808 return NOTIFY_OK;
2809 }
2810
2811 /*
2812 * /proc
2813 */
2814
2815 #ifdef CONFIG_PROC_FS
2816
2817 static const struct file_operations ipv6_route_proc_fops = {
2818 .owner = THIS_MODULE,
2819 .open = ipv6_route_open,
2820 .read = seq_read,
2821 .llseek = seq_lseek,
2822 .release = seq_release_net,
2823 };
2824
2825 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2826 {
2827 struct net *net = (struct net *)seq->private;
2828 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2829 net->ipv6.rt6_stats->fib_nodes,
2830 net->ipv6.rt6_stats->fib_route_nodes,
2831 net->ipv6.rt6_stats->fib_rt_alloc,
2832 net->ipv6.rt6_stats->fib_rt_entries,
2833 net->ipv6.rt6_stats->fib_rt_cache,
2834 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2835 net->ipv6.rt6_stats->fib_discarded_routes);
2836
2837 return 0;
2838 }
2839
2840 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2841 {
2842 return single_open_net(inode, file, rt6_stats_seq_show);
2843 }
2844
2845 static const struct file_operations rt6_stats_seq_fops = {
2846 .owner = THIS_MODULE,
2847 .open = rt6_stats_seq_open,
2848 .read = seq_read,
2849 .llseek = seq_lseek,
2850 .release = single_release_net,
2851 };
2852 #endif /* CONFIG_PROC_FS */
2853
2854 #ifdef CONFIG_SYSCTL
2855
2856 static
2857 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2858 void __user *buffer, size_t *lenp, loff_t *ppos)
2859 {
2860 struct net *net;
2861 int delay;
2862 if (!write)
2863 return -EINVAL;
2864
2865 net = (struct net *)ctl->extra1;
2866 delay = net->ipv6.sysctl.flush_delay;
2867 proc_dointvec(ctl, write, buffer, lenp, ppos);
2868 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2869 return 0;
2870 }
2871
2872 struct ctl_table ipv6_route_table_template[] = {
2873 {
2874 .procname = "flush",
2875 .data = &init_net.ipv6.sysctl.flush_delay,
2876 .maxlen = sizeof(int),
2877 .mode = 0200,
2878 .proc_handler = ipv6_sysctl_rtcache_flush
2879 },
2880 {
2881 .procname = "gc_thresh",
2882 .data = &ip6_dst_ops_template.gc_thresh,
2883 .maxlen = sizeof(int),
2884 .mode = 0644,
2885 .proc_handler = proc_dointvec,
2886 },
2887 {
2888 .procname = "max_size",
2889 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2890 .maxlen = sizeof(int),
2891 .mode = 0644,
2892 .proc_handler = proc_dointvec,
2893 },
2894 {
2895 .procname = "gc_min_interval",
2896 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2897 .maxlen = sizeof(int),
2898 .mode = 0644,
2899 .proc_handler = proc_dointvec_jiffies,
2900 },
2901 {
2902 .procname = "gc_timeout",
2903 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2904 .maxlen = sizeof(int),
2905 .mode = 0644,
2906 .proc_handler = proc_dointvec_jiffies,
2907 },
2908 {
2909 .procname = "gc_interval",
2910 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2911 .maxlen = sizeof(int),
2912 .mode = 0644,
2913 .proc_handler = proc_dointvec_jiffies,
2914 },
2915 {
2916 .procname = "gc_elasticity",
2917 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2918 .maxlen = sizeof(int),
2919 .mode = 0644,
2920 .proc_handler = proc_dointvec,
2921 },
2922 {
2923 .procname = "mtu_expires",
2924 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2925 .maxlen = sizeof(int),
2926 .mode = 0644,
2927 .proc_handler = proc_dointvec_jiffies,
2928 },
2929 {
2930 .procname = "min_adv_mss",
2931 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2932 .maxlen = sizeof(int),
2933 .mode = 0644,
2934 .proc_handler = proc_dointvec,
2935 },
2936 {
2937 .procname = "gc_min_interval_ms",
2938 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2939 .maxlen = sizeof(int),
2940 .mode = 0644,
2941 .proc_handler = proc_dointvec_ms_jiffies,
2942 },
2943 { }
2944 };
2945
2946 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2947 {
2948 struct ctl_table *table;
2949
2950 table = kmemdup(ipv6_route_table_template,
2951 sizeof(ipv6_route_table_template),
2952 GFP_KERNEL);
2953
2954 if (table) {
2955 table[0].data = &net->ipv6.sysctl.flush_delay;
2956 table[0].extra1 = net;
2957 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2958 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2959 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2960 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2961 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2962 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2963 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2964 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2965 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2966
2967 /* Don't export sysctls to unprivileged users */
2968 if (net->user_ns != &init_user_ns)
2969 table[0].procname = NULL;
2970 }
2971
2972 return table;
2973 }
2974 #endif
2975
2976 static int __net_init ip6_route_net_init(struct net *net)
2977 {
2978 int ret = -ENOMEM;
2979
2980 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2981 sizeof(net->ipv6.ip6_dst_ops));
2982
2983 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2984 goto out_ip6_dst_ops;
2985
2986 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2987 sizeof(*net->ipv6.ip6_null_entry),
2988 GFP_KERNEL);
2989 if (!net->ipv6.ip6_null_entry)
2990 goto out_ip6_dst_entries;
2991 net->ipv6.ip6_null_entry->dst.path =
2992 (struct dst_entry *)net->ipv6.ip6_null_entry;
2993 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2994 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2995 ip6_template_metrics, true);
2996
2997 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2998 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2999 sizeof(*net->ipv6.ip6_prohibit_entry),
3000 GFP_KERNEL);
3001 if (!net->ipv6.ip6_prohibit_entry)
3002 goto out_ip6_null_entry;
3003 net->ipv6.ip6_prohibit_entry->dst.path =
3004 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3005 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3006 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3007 ip6_template_metrics, true);
3008
3009 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3010 sizeof(*net->ipv6.ip6_blk_hole_entry),
3011 GFP_KERNEL);
3012 if (!net->ipv6.ip6_blk_hole_entry)
3013 goto out_ip6_prohibit_entry;
3014 net->ipv6.ip6_blk_hole_entry->dst.path =
3015 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3016 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3017 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3018 ip6_template_metrics, true);
3019 #endif
3020
3021 net->ipv6.sysctl.flush_delay = 0;
3022 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3023 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3024 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3025 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3026 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3027 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3028 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3029
3030 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3031
3032 ret = 0;
3033 out:
3034 return ret;
3035
3036 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3037 out_ip6_prohibit_entry:
3038 kfree(net->ipv6.ip6_prohibit_entry);
3039 out_ip6_null_entry:
3040 kfree(net->ipv6.ip6_null_entry);
3041 #endif
3042 out_ip6_dst_entries:
3043 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3044 out_ip6_dst_ops:
3045 goto out;
3046 }
3047
3048 static void __net_exit ip6_route_net_exit(struct net *net)
3049 {
3050 kfree(net->ipv6.ip6_null_entry);
3051 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3052 kfree(net->ipv6.ip6_prohibit_entry);
3053 kfree(net->ipv6.ip6_blk_hole_entry);
3054 #endif
3055 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3056 }
3057
3058 static int __net_init ip6_route_net_init_late(struct net *net)
3059 {
3060 #ifdef CONFIG_PROC_FS
3061 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3062 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3063 #endif
3064 return 0;
3065 }
3066
3067 static void __net_exit ip6_route_net_exit_late(struct net *net)
3068 {
3069 #ifdef CONFIG_PROC_FS
3070 remove_proc_entry("ipv6_route", net->proc_net);
3071 remove_proc_entry("rt6_stats", net->proc_net);
3072 #endif
3073 }
3074
3075 static struct pernet_operations ip6_route_net_ops = {
3076 .init = ip6_route_net_init,
3077 .exit = ip6_route_net_exit,
3078 };
3079
3080 static int __net_init ipv6_inetpeer_init(struct net *net)
3081 {
3082 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3083
3084 if (!bp)
3085 return -ENOMEM;
3086 inet_peer_base_init(bp);
3087 net->ipv6.peers = bp;
3088 return 0;
3089 }
3090
3091 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3092 {
3093 struct inet_peer_base *bp = net->ipv6.peers;
3094
3095 net->ipv6.peers = NULL;
3096 inetpeer_invalidate_tree(bp);
3097 kfree(bp);
3098 }
3099
3100 static struct pernet_operations ipv6_inetpeer_ops = {
3101 .init = ipv6_inetpeer_init,
3102 .exit = ipv6_inetpeer_exit,
3103 };
3104
3105 static struct pernet_operations ip6_route_net_late_ops = {
3106 .init = ip6_route_net_init_late,
3107 .exit = ip6_route_net_exit_late,
3108 };
3109
3110 static struct notifier_block ip6_route_dev_notifier = {
3111 .notifier_call = ip6_route_dev_notify,
3112 .priority = 0,
3113 };
3114
3115 int __init ip6_route_init(void)
3116 {
3117 int ret;
3118
3119 ret = -ENOMEM;
3120 ip6_dst_ops_template.kmem_cachep =
3121 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3122 SLAB_HWCACHE_ALIGN, NULL);
3123 if (!ip6_dst_ops_template.kmem_cachep)
3124 goto out;
3125
3126 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3127 if (ret)
3128 goto out_kmem_cache;
3129
3130 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3131 if (ret)
3132 goto out_dst_entries;
3133
3134 ret = register_pernet_subsys(&ip6_route_net_ops);
3135 if (ret)
3136 goto out_register_inetpeer;
3137
3138 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3139
3140 /* Registering of the loopback is done before this portion of code,
3141 * the loopback reference in rt6_info will not be taken, do it
3142 * manually for init_net */
3143 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3144 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3145 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3146 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3147 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3148 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3149 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3150 #endif
3151 ret = fib6_init();
3152 if (ret)
3153 goto out_register_subsys;
3154
3155 ret = xfrm6_init();
3156 if (ret)
3157 goto out_fib6_init;
3158
3159 ret = fib6_rules_init();
3160 if (ret)
3161 goto xfrm6_init;
3162
3163 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3164 if (ret)
3165 goto fib6_rules_init;
3166
3167 ret = -ENOBUFS;
3168 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3169 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3170 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3171 goto out_register_late_subsys;
3172
3173 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3174 if (ret)
3175 goto out_register_late_subsys;
3176
3177 out:
3178 return ret;
3179
3180 out_register_late_subsys:
3181 unregister_pernet_subsys(&ip6_route_net_late_ops);
3182 fib6_rules_init:
3183 fib6_rules_cleanup();
3184 xfrm6_init:
3185 xfrm6_fini();
3186 out_fib6_init:
3187 fib6_gc_cleanup();
3188 out_register_subsys:
3189 unregister_pernet_subsys(&ip6_route_net_ops);
3190 out_register_inetpeer:
3191 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3192 out_dst_entries:
3193 dst_entries_destroy(&ip6_dst_blackhole_ops);
3194 out_kmem_cache:
3195 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3196 goto out;
3197 }
3198
3199 void ip6_route_cleanup(void)
3200 {
3201 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3202 unregister_pernet_subsys(&ip6_route_net_late_ops);
3203 fib6_rules_cleanup();
3204 xfrm6_fini();
3205 fib6_gc_cleanup();
3206 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3207 unregister_pernet_subsys(&ip6_route_net_ops);
3208 dst_entries_destroy(&ip6_dst_blackhole_ops);
3209 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3210 }
Linux kernel - Deliverables
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