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[mirror_ubuntu-artful-kernel.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_iif = LOOPBACK_IFINDEX;
1277 fl6.flowi6_oif = oif;
1278 fl6.flowi6_mark = mark;
1279 fl6.daddr = iph->daddr;
1280 fl6.saddr = iph->saddr;
1281 fl6.flowlabel = ip6_flowinfo(iph);
1282
1283 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1284 rt6_do_redirect(dst, NULL, skb);
1285 dst_release(dst);
1286 }
1287 EXPORT_SYMBOL_GPL(ip6_redirect);
1288
1289 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1290 u32 mark)
1291 {
1292 const struct ipv6hdr *iph = ipv6_hdr(skb);
1293 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1294 struct dst_entry *dst;
1295 struct flowi6 fl6;
1296
1297 memset(&fl6, 0, sizeof(fl6));
1298 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1299 fl6.flowi6_oif = oif;
1300 fl6.flowi6_mark = mark;
1301 fl6.daddr = msg->dest;
1302 fl6.saddr = iph->daddr;
1303
1304 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1305 rt6_do_redirect(dst, NULL, skb);
1306 dst_release(dst);
1307 }
1308
1309 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1310 {
1311 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1312 }
1313 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1314
1315 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1316 {
1317 struct net_device *dev = dst->dev;
1318 unsigned int mtu = dst_mtu(dst);
1319 struct net *net = dev_net(dev);
1320
1321 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1322
1323 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1324 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1325
1326 /*
1327 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1328 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1329 * IPV6_MAXPLEN is also valid and means: "any MSS,
1330 * rely only on pmtu discovery"
1331 */
1332 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1333 mtu = IPV6_MAXPLEN;
1334 return mtu;
1335 }
1336
1337 static unsigned int ip6_mtu(const struct dst_entry *dst)
1338 {
1339 struct inet6_dev *idev;
1340 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1341
1342 if (mtu)
1343 goto out;
1344
1345 mtu = IPV6_MIN_MTU;
1346
1347 rcu_read_lock();
1348 idev = __in6_dev_get(dst->dev);
1349 if (idev)
1350 mtu = idev->cnf.mtu6;
1351 rcu_read_unlock();
1352
1353 out:
1354 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1355 }
1356
1357 static struct dst_entry *icmp6_dst_gc_list;
1358 static DEFINE_SPINLOCK(icmp6_dst_lock);
1359
1360 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1361 struct flowi6 *fl6)
1362 {
1363 struct dst_entry *dst;
1364 struct rt6_info *rt;
1365 struct inet6_dev *idev = in6_dev_get(dev);
1366 struct net *net = dev_net(dev);
1367
1368 if (unlikely(!idev))
1369 return ERR_PTR(-ENODEV);
1370
1371 rt = ip6_dst_alloc(net, dev, 0, NULL);
1372 if (unlikely(!rt)) {
1373 in6_dev_put(idev);
1374 dst = ERR_PTR(-ENOMEM);
1375 goto out;
1376 }
1377
1378 rt->dst.flags |= DST_HOST;
1379 rt->dst.output = ip6_output;
1380 atomic_set(&rt->dst.__refcnt, 1);
1381 rt->rt6i_gateway = fl6->daddr;
1382 rt->rt6i_dst.addr = fl6->daddr;
1383 rt->rt6i_dst.plen = 128;
1384 rt->rt6i_idev = idev;
1385 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1386
1387 spin_lock_bh(&icmp6_dst_lock);
1388 rt->dst.next = icmp6_dst_gc_list;
1389 icmp6_dst_gc_list = &rt->dst;
1390 spin_unlock_bh(&icmp6_dst_lock);
1391
1392 fib6_force_start_gc(net);
1393
1394 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1395
1396 out:
1397 return dst;
1398 }
1399
1400 int icmp6_dst_gc(void)
1401 {
1402 struct dst_entry *dst, **pprev;
1403 int more = 0;
1404
1405 spin_lock_bh(&icmp6_dst_lock);
1406 pprev = &icmp6_dst_gc_list;
1407
1408 while ((dst = *pprev) != NULL) {
1409 if (!atomic_read(&dst->__refcnt)) {
1410 *pprev = dst->next;
1411 dst_free(dst);
1412 } else {
1413 pprev = &dst->next;
1414 ++more;
1415 }
1416 }
1417
1418 spin_unlock_bh(&icmp6_dst_lock);
1419
1420 return more;
1421 }
1422
1423 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1424 void *arg)
1425 {
1426 struct dst_entry *dst, **pprev;
1427
1428 spin_lock_bh(&icmp6_dst_lock);
1429 pprev = &icmp6_dst_gc_list;
1430 while ((dst = *pprev) != NULL) {
1431 struct rt6_info *rt = (struct rt6_info *) dst;
1432 if (func(rt, arg)) {
1433 *pprev = dst->next;
1434 dst_free(dst);
1435 } else {
1436 pprev = &dst->next;
1437 }
1438 }
1439 spin_unlock_bh(&icmp6_dst_lock);
1440 }
1441
1442 static int ip6_dst_gc(struct dst_ops *ops)
1443 {
1444 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1445 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1446 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1447 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1448 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1449 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1450 int entries;
1451
1452 entries = dst_entries_get_fast(ops);
1453 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1454 entries <= rt_max_size)
1455 goto out;
1456
1457 net->ipv6.ip6_rt_gc_expire++;
1458 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1459 entries = dst_entries_get_slow(ops);
1460 if (entries < ops->gc_thresh)
1461 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1462 out:
1463 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1464 return entries > rt_max_size;
1465 }
1466
1467 /*
1468 *
1469 */
1470
1471 int ip6_route_add(struct fib6_config *cfg)
1472 {
1473 int err;
1474 struct net *net = cfg->fc_nlinfo.nl_net;
1475 struct rt6_info *rt = NULL;
1476 struct net_device *dev = NULL;
1477 struct inet6_dev *idev = NULL;
1478 struct fib6_table *table;
1479 int addr_type;
1480
1481 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1482 return -EINVAL;
1483 #ifndef CONFIG_IPV6_SUBTREES
1484 if (cfg->fc_src_len)
1485 return -EINVAL;
1486 #endif
1487 if (cfg->fc_ifindex) {
1488 err = -ENODEV;
1489 dev = dev_get_by_index(net, cfg->fc_ifindex);
1490 if (!dev)
1491 goto out;
1492 idev = in6_dev_get(dev);
1493 if (!idev)
1494 goto out;
1495 }
1496
1497 if (cfg->fc_metric == 0)
1498 cfg->fc_metric = IP6_RT_PRIO_USER;
1499
1500 err = -ENOBUFS;
1501 if (cfg->fc_nlinfo.nlh &&
1502 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1503 table = fib6_get_table(net, cfg->fc_table);
1504 if (!table) {
1505 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1506 table = fib6_new_table(net, cfg->fc_table);
1507 }
1508 } else {
1509 table = fib6_new_table(net, cfg->fc_table);
1510 }
1511
1512 if (!table)
1513 goto out;
1514
1515 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1516
1517 if (!rt) {
1518 err = -ENOMEM;
1519 goto out;
1520 }
1521
1522 if (cfg->fc_flags & RTF_EXPIRES)
1523 rt6_set_expires(rt, jiffies +
1524 clock_t_to_jiffies(cfg->fc_expires));
1525 else
1526 rt6_clean_expires(rt);
1527
1528 if (cfg->fc_protocol == RTPROT_UNSPEC)
1529 cfg->fc_protocol = RTPROT_BOOT;
1530 rt->rt6i_protocol = cfg->fc_protocol;
1531
1532 addr_type = ipv6_addr_type(&cfg->fc_dst);
1533
1534 if (addr_type & IPV6_ADDR_MULTICAST)
1535 rt->dst.input = ip6_mc_input;
1536 else if (cfg->fc_flags & RTF_LOCAL)
1537 rt->dst.input = ip6_input;
1538 else
1539 rt->dst.input = ip6_forward;
1540
1541 rt->dst.output = ip6_output;
1542
1543 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1544 rt->rt6i_dst.plen = cfg->fc_dst_len;
1545 if (rt->rt6i_dst.plen == 128) {
1546 rt->dst.flags |= DST_HOST;
1547 dst_metrics_set_force_overwrite(&rt->dst);
1548 }
1549
1550 #ifdef CONFIG_IPV6_SUBTREES
1551 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1552 rt->rt6i_src.plen = cfg->fc_src_len;
1553 #endif
1554
1555 rt->rt6i_metric = cfg->fc_metric;
1556
1557 /* We cannot add true routes via loopback here,
1558 they would result in kernel looping; promote them to reject routes
1559 */
1560 if ((cfg->fc_flags & RTF_REJECT) ||
1561 (dev && (dev->flags & IFF_LOOPBACK) &&
1562 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1563 !(cfg->fc_flags & RTF_LOCAL))) {
1564 /* hold loopback dev/idev if we haven't done so. */
1565 if (dev != net->loopback_dev) {
1566 if (dev) {
1567 dev_put(dev);
1568 in6_dev_put(idev);
1569 }
1570 dev = net->loopback_dev;
1571 dev_hold(dev);
1572 idev = in6_dev_get(dev);
1573 if (!idev) {
1574 err = -ENODEV;
1575 goto out;
1576 }
1577 }
1578 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1579 switch (cfg->fc_type) {
1580 case RTN_BLACKHOLE:
1581 rt->dst.error = -EINVAL;
1582 rt->dst.output = dst_discard_sk;
1583 rt->dst.input = dst_discard;
1584 break;
1585 case RTN_PROHIBIT:
1586 rt->dst.error = -EACCES;
1587 rt->dst.output = ip6_pkt_prohibit_out;
1588 rt->dst.input = ip6_pkt_prohibit;
1589 break;
1590 case RTN_THROW:
1591 default:
1592 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1593 : -ENETUNREACH;
1594 rt->dst.output = ip6_pkt_discard_out;
1595 rt->dst.input = ip6_pkt_discard;
1596 break;
1597 }
1598 goto install_route;
1599 }
1600
1601 if (cfg->fc_flags & RTF_GATEWAY) {
1602 const struct in6_addr *gw_addr;
1603 int gwa_type;
1604
1605 gw_addr = &cfg->fc_gateway;
1606 rt->rt6i_gateway = *gw_addr;
1607 gwa_type = ipv6_addr_type(gw_addr);
1608
1609 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1610 struct rt6_info *grt;
1611
1612 /* IPv6 strictly inhibits using not link-local
1613 addresses as nexthop address.
1614 Otherwise, router will not able to send redirects.
1615 It is very good, but in some (rare!) circumstances
1616 (SIT, PtP, NBMA NOARP links) it is handy to allow
1617 some exceptions. --ANK
1618 */
1619 err = -EINVAL;
1620 if (!(gwa_type & IPV6_ADDR_UNICAST))
1621 goto out;
1622
1623 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1624
1625 err = -EHOSTUNREACH;
1626 if (!grt)
1627 goto out;
1628 if (dev) {
1629 if (dev != grt->dst.dev) {
1630 ip6_rt_put(grt);
1631 goto out;
1632 }
1633 } else {
1634 dev = grt->dst.dev;
1635 idev = grt->rt6i_idev;
1636 dev_hold(dev);
1637 in6_dev_hold(grt->rt6i_idev);
1638 }
1639 if (!(grt->rt6i_flags & RTF_GATEWAY))
1640 err = 0;
1641 ip6_rt_put(grt);
1642
1643 if (err)
1644 goto out;
1645 }
1646 err = -EINVAL;
1647 if (!dev || (dev->flags & IFF_LOOPBACK))
1648 goto out;
1649 }
1650
1651 err = -ENODEV;
1652 if (!dev)
1653 goto out;
1654
1655 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1656 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1657 err = -EINVAL;
1658 goto out;
1659 }
1660 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1661 rt->rt6i_prefsrc.plen = 128;
1662 } else
1663 rt->rt6i_prefsrc.plen = 0;
1664
1665 rt->rt6i_flags = cfg->fc_flags;
1666
1667 install_route:
1668 rt->dst.dev = dev;
1669 rt->rt6i_idev = idev;
1670 rt->rt6i_table = table;
1671
1672 cfg->fc_nlinfo.nl_net = dev_net(dev);
1673
1674 return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
1675
1676 out:
1677 if (dev)
1678 dev_put(dev);
1679 if (idev)
1680 in6_dev_put(idev);
1681 if (rt)
1682 dst_free(&rt->dst);
1683 return err;
1684 }
1685
1686 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1687 {
1688 int err;
1689 struct fib6_table *table;
1690 struct net *net = dev_net(rt->dst.dev);
1691
1692 if (rt == net->ipv6.ip6_null_entry) {
1693 err = -ENOENT;
1694 goto out;
1695 }
1696
1697 table = rt->rt6i_table;
1698 write_lock_bh(&table->tb6_lock);
1699 err = fib6_del(rt, info);
1700 write_unlock_bh(&table->tb6_lock);
1701
1702 out:
1703 ip6_rt_put(rt);
1704 return err;
1705 }
1706
1707 int ip6_del_rt(struct rt6_info *rt)
1708 {
1709 struct nl_info info = {
1710 .nl_net = dev_net(rt->dst.dev),
1711 };
1712 return __ip6_del_rt(rt, &info);
1713 }
1714
1715 static int ip6_route_del(struct fib6_config *cfg)
1716 {
1717 struct fib6_table *table;
1718 struct fib6_node *fn;
1719 struct rt6_info *rt;
1720 int err = -ESRCH;
1721
1722 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1723 if (!table)
1724 return err;
1725
1726 read_lock_bh(&table->tb6_lock);
1727
1728 fn = fib6_locate(&table->tb6_root,
1729 &cfg->fc_dst, cfg->fc_dst_len,
1730 &cfg->fc_src, cfg->fc_src_len);
1731
1732 if (fn) {
1733 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1734 if (cfg->fc_ifindex &&
1735 (!rt->dst.dev ||
1736 rt->dst.dev->ifindex != cfg->fc_ifindex))
1737 continue;
1738 if (cfg->fc_flags & RTF_GATEWAY &&
1739 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1740 continue;
1741 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1742 continue;
1743 dst_hold(&rt->dst);
1744 read_unlock_bh(&table->tb6_lock);
1745
1746 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1747 }
1748 }
1749 read_unlock_bh(&table->tb6_lock);
1750
1751 return err;
1752 }
1753
1754 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1755 {
1756 struct net *net = dev_net(skb->dev);
1757 struct netevent_redirect netevent;
1758 struct rt6_info *rt, *nrt = NULL;
1759 struct ndisc_options ndopts;
1760 struct inet6_dev *in6_dev;
1761 struct neighbour *neigh;
1762 struct rd_msg *msg;
1763 int optlen, on_link;
1764 u8 *lladdr;
1765
1766 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1767 optlen -= sizeof(*msg);
1768
1769 if (optlen < 0) {
1770 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1771 return;
1772 }
1773
1774 msg = (struct rd_msg *)icmp6_hdr(skb);
1775
1776 if (ipv6_addr_is_multicast(&msg->dest)) {
1777 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1778 return;
1779 }
1780
1781 on_link = 0;
1782 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1783 on_link = 1;
1784 } else if (ipv6_addr_type(&msg->target) !=
1785 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1786 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1787 return;
1788 }
1789
1790 in6_dev = __in6_dev_get(skb->dev);
1791 if (!in6_dev)
1792 return;
1793 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1794 return;
1795
1796 /* RFC2461 8.1:
1797 * The IP source address of the Redirect MUST be the same as the current
1798 * first-hop router for the specified ICMP Destination Address.
1799 */
1800
1801 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1802 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1803 return;
1804 }
1805
1806 lladdr = NULL;
1807 if (ndopts.nd_opts_tgt_lladdr) {
1808 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1809 skb->dev);
1810 if (!lladdr) {
1811 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1812 return;
1813 }
1814 }
1815
1816 rt = (struct rt6_info *) dst;
1817 if (rt == net->ipv6.ip6_null_entry) {
1818 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1819 return;
1820 }
1821
1822 /* Redirect received -> path was valid.
1823 * Look, redirects are sent only in response to data packets,
1824 * so that this nexthop apparently is reachable. --ANK
1825 */
1826 dst_confirm(&rt->dst);
1827
1828 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1829 if (!neigh)
1830 return;
1831
1832 /*
1833 * We have finally decided to accept it.
1834 */
1835
1836 neigh_update(neigh, lladdr, NUD_STALE,
1837 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1838 NEIGH_UPDATE_F_OVERRIDE|
1839 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1840 NEIGH_UPDATE_F_ISROUTER))
1841 );
1842
1843 nrt = ip6_rt_copy(rt, &msg->dest);
1844 if (!nrt)
1845 goto out;
1846
1847 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1848 if (on_link)
1849 nrt->rt6i_flags &= ~RTF_GATEWAY;
1850
1851 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1852
1853 if (ip6_ins_rt(nrt))
1854 goto out;
1855
1856 netevent.old = &rt->dst;
1857 netevent.new = &nrt->dst;
1858 netevent.daddr = &msg->dest;
1859 netevent.neigh = neigh;
1860 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1861
1862 if (rt->rt6i_flags & RTF_CACHE) {
1863 rt = (struct rt6_info *) dst_clone(&rt->dst);
1864 ip6_del_rt(rt);
1865 }
1866
1867 out:
1868 neigh_release(neigh);
1869 }
1870
1871 /*
1872 * Misc support functions
1873 */
1874
1875 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1876 const struct in6_addr *dest)
1877 {
1878 struct net *net = dev_net(ort->dst.dev);
1879 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1880 ort->rt6i_table);
1881
1882 if (rt) {
1883 rt->dst.input = ort->dst.input;
1884 rt->dst.output = ort->dst.output;
1885 rt->dst.flags |= DST_HOST;
1886
1887 rt->rt6i_dst.addr = *dest;
1888 rt->rt6i_dst.plen = 128;
1889 dst_copy_metrics(&rt->dst, &ort->dst);
1890 rt->dst.error = ort->dst.error;
1891 rt->rt6i_idev = ort->rt6i_idev;
1892 if (rt->rt6i_idev)
1893 in6_dev_hold(rt->rt6i_idev);
1894 rt->dst.lastuse = jiffies;
1895
1896 if (ort->rt6i_flags & RTF_GATEWAY)
1897 rt->rt6i_gateway = ort->rt6i_gateway;
1898 else
1899 rt->rt6i_gateway = *dest;
1900 rt->rt6i_flags = ort->rt6i_flags;
1901 rt6_set_from(rt, ort);
1902 rt->rt6i_metric = 0;
1903
1904 #ifdef CONFIG_IPV6_SUBTREES
1905 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1906 #endif
1907 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1908 rt->rt6i_table = ort->rt6i_table;
1909 }
1910 return rt;
1911 }
1912
1913 #ifdef CONFIG_IPV6_ROUTE_INFO
1914 static struct rt6_info *rt6_get_route_info(struct net *net,
1915 const struct in6_addr *prefix, int prefixlen,
1916 const struct in6_addr *gwaddr, int ifindex)
1917 {
1918 struct fib6_node *fn;
1919 struct rt6_info *rt = NULL;
1920 struct fib6_table *table;
1921
1922 table = fib6_get_table(net, RT6_TABLE_INFO);
1923 if (!table)
1924 return NULL;
1925
1926 read_lock_bh(&table->tb6_lock);
1927 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1928 if (!fn)
1929 goto out;
1930
1931 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1932 if (rt->dst.dev->ifindex != ifindex)
1933 continue;
1934 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1935 continue;
1936 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1937 continue;
1938 dst_hold(&rt->dst);
1939 break;
1940 }
1941 out:
1942 read_unlock_bh(&table->tb6_lock);
1943 return rt;
1944 }
1945
1946 static struct rt6_info *rt6_add_route_info(struct net *net,
1947 const struct in6_addr *prefix, int prefixlen,
1948 const struct in6_addr *gwaddr, int ifindex,
1949 unsigned int pref)
1950 {
1951 struct fib6_config cfg = {
1952 .fc_table = RT6_TABLE_INFO,
1953 .fc_metric = IP6_RT_PRIO_USER,
1954 .fc_ifindex = ifindex,
1955 .fc_dst_len = prefixlen,
1956 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1957 RTF_UP | RTF_PREF(pref),
1958 .fc_nlinfo.portid = 0,
1959 .fc_nlinfo.nlh = NULL,
1960 .fc_nlinfo.nl_net = net,
1961 };
1962
1963 cfg.fc_dst = *prefix;
1964 cfg.fc_gateway = *gwaddr;
1965
1966 /* We should treat it as a default route if prefix length is 0. */
1967 if (!prefixlen)
1968 cfg.fc_flags |= RTF_DEFAULT;
1969
1970 ip6_route_add(&cfg);
1971
1972 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1973 }
1974 #endif
1975
1976 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1977 {
1978 struct rt6_info *rt;
1979 struct fib6_table *table;
1980
1981 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1982 if (!table)
1983 return NULL;
1984
1985 read_lock_bh(&table->tb6_lock);
1986 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1987 if (dev == rt->dst.dev &&
1988 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1989 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1990 break;
1991 }
1992 if (rt)
1993 dst_hold(&rt->dst);
1994 read_unlock_bh(&table->tb6_lock);
1995 return rt;
1996 }
1997
1998 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1999 struct net_device *dev,
2000 unsigned int pref)
2001 {
2002 struct fib6_config cfg = {
2003 .fc_table = RT6_TABLE_DFLT,
2004 .fc_metric = IP6_RT_PRIO_USER,
2005 .fc_ifindex = dev->ifindex,
2006 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2007 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2008 .fc_nlinfo.portid = 0,
2009 .fc_nlinfo.nlh = NULL,
2010 .fc_nlinfo.nl_net = dev_net(dev),
2011 };
2012
2013 cfg.fc_gateway = *gwaddr;
2014
2015 ip6_route_add(&cfg);
2016
2017 return rt6_get_dflt_router(gwaddr, dev);
2018 }
2019
2020 void rt6_purge_dflt_routers(struct net *net)
2021 {
2022 struct rt6_info *rt;
2023 struct fib6_table *table;
2024
2025 /* NOTE: Keep consistent with rt6_get_dflt_router */
2026 table = fib6_get_table(net, RT6_TABLE_DFLT);
2027 if (!table)
2028 return;
2029
2030 restart:
2031 read_lock_bh(&table->tb6_lock);
2032 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2033 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2034 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2035 dst_hold(&rt->dst);
2036 read_unlock_bh(&table->tb6_lock);
2037 ip6_del_rt(rt);
2038 goto restart;
2039 }
2040 }
2041 read_unlock_bh(&table->tb6_lock);
2042 }
2043
2044 static void rtmsg_to_fib6_config(struct net *net,
2045 struct in6_rtmsg *rtmsg,
2046 struct fib6_config *cfg)
2047 {
2048 memset(cfg, 0, sizeof(*cfg));
2049
2050 cfg->fc_table = RT6_TABLE_MAIN;
2051 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2052 cfg->fc_metric = rtmsg->rtmsg_metric;
2053 cfg->fc_expires = rtmsg->rtmsg_info;
2054 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2055 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2056 cfg->fc_flags = rtmsg->rtmsg_flags;
2057
2058 cfg->fc_nlinfo.nl_net = net;
2059
2060 cfg->fc_dst = rtmsg->rtmsg_dst;
2061 cfg->fc_src = rtmsg->rtmsg_src;
2062 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2063 }
2064
2065 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2066 {
2067 struct fib6_config cfg;
2068 struct in6_rtmsg rtmsg;
2069 int err;
2070
2071 switch(cmd) {
2072 case SIOCADDRT: /* Add a route */
2073 case SIOCDELRT: /* Delete a route */
2074 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2075 return -EPERM;
2076 err = copy_from_user(&rtmsg, arg,
2077 sizeof(struct in6_rtmsg));
2078 if (err)
2079 return -EFAULT;
2080
2081 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2082
2083 rtnl_lock();
2084 switch (cmd) {
2085 case SIOCADDRT:
2086 err = ip6_route_add(&cfg);
2087 break;
2088 case SIOCDELRT:
2089 err = ip6_route_del(&cfg);
2090 break;
2091 default:
2092 err = -EINVAL;
2093 }
2094 rtnl_unlock();
2095
2096 return err;
2097 }
2098
2099 return -EINVAL;
2100 }
2101
2102 /*
2103 * Drop the packet on the floor
2104 */
2105
2106 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2107 {
2108 int type;
2109 struct dst_entry *dst = skb_dst(skb);
2110 switch (ipstats_mib_noroutes) {
2111 case IPSTATS_MIB_INNOROUTES:
2112 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2113 if (type == IPV6_ADDR_ANY) {
2114 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2115 IPSTATS_MIB_INADDRERRORS);
2116 break;
2117 }
2118 /* FALLTHROUGH */
2119 case IPSTATS_MIB_OUTNOROUTES:
2120 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2121 ipstats_mib_noroutes);
2122 break;
2123 }
2124 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2125 kfree_skb(skb);
2126 return 0;
2127 }
2128
2129 static int ip6_pkt_discard(struct sk_buff *skb)
2130 {
2131 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2132 }
2133
2134 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2135 {
2136 skb->dev = skb_dst(skb)->dev;
2137 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2138 }
2139
2140 static int ip6_pkt_prohibit(struct sk_buff *skb)
2141 {
2142 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2143 }
2144
2145 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2146 {
2147 skb->dev = skb_dst(skb)->dev;
2148 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2149 }
2150
2151 /*
2152 * Allocate a dst for local (unicast / anycast) address.
2153 */
2154
2155 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2156 const struct in6_addr *addr,
2157 bool anycast)
2158 {
2159 struct net *net = dev_net(idev->dev);
2160 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2161 DST_NOCOUNT, NULL);
2162 if (!rt)
2163 return ERR_PTR(-ENOMEM);
2164
2165 in6_dev_hold(idev);
2166
2167 rt->dst.flags |= DST_HOST;
2168 rt->dst.input = ip6_input;
2169 rt->dst.output = ip6_output;
2170 rt->rt6i_idev = idev;
2171
2172 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2173 if (anycast)
2174 rt->rt6i_flags |= RTF_ANYCAST;
2175 else
2176 rt->rt6i_flags |= RTF_LOCAL;
2177
2178 rt->rt6i_gateway = *addr;
2179 rt->rt6i_dst.addr = *addr;
2180 rt->rt6i_dst.plen = 128;
2181 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2182
2183 atomic_set(&rt->dst.__refcnt, 1);
2184
2185 return rt;
2186 }
2187
2188 int ip6_route_get_saddr(struct net *net,
2189 struct rt6_info *rt,
2190 const struct in6_addr *daddr,
2191 unsigned int prefs,
2192 struct in6_addr *saddr)
2193 {
2194 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2195 int err = 0;
2196 if (rt->rt6i_prefsrc.plen)
2197 *saddr = rt->rt6i_prefsrc.addr;
2198 else
2199 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2200 daddr, prefs, saddr);
2201 return err;
2202 }
2203
2204 /* remove deleted ip from prefsrc entries */
2205 struct arg_dev_net_ip {
2206 struct net_device *dev;
2207 struct net *net;
2208 struct in6_addr *addr;
2209 };
2210
2211 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2212 {
2213 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2214 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2215 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2216
2217 if (((void *)rt->dst.dev == dev || !dev) &&
2218 rt != net->ipv6.ip6_null_entry &&
2219 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2220 /* remove prefsrc entry */
2221 rt->rt6i_prefsrc.plen = 0;
2222 }
2223 return 0;
2224 }
2225
2226 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2227 {
2228 struct net *net = dev_net(ifp->idev->dev);
2229 struct arg_dev_net_ip adni = {
2230 .dev = ifp->idev->dev,
2231 .net = net,
2232 .addr = &ifp->addr,
2233 };
2234 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2235 }
2236
2237 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2238 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2239
2240 /* Remove routers and update dst entries when gateway turn into host. */
2241 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2242 {
2243 struct in6_addr *gateway = (struct in6_addr *)arg;
2244
2245 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2246 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2247 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2248 return -1;
2249 }
2250 return 0;
2251 }
2252
2253 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2254 {
2255 fib6_clean_all(net, fib6_clean_tohost, gateway);
2256 }
2257
2258 struct arg_dev_net {
2259 struct net_device *dev;
2260 struct net *net;
2261 };
2262
2263 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2264 {
2265 const struct arg_dev_net *adn = arg;
2266 const struct net_device *dev = adn->dev;
2267
2268 if ((rt->dst.dev == dev || !dev) &&
2269 rt != adn->net->ipv6.ip6_null_entry)
2270 return -1;
2271
2272 return 0;
2273 }
2274
2275 void rt6_ifdown(struct net *net, struct net_device *dev)
2276 {
2277 struct arg_dev_net adn = {
2278 .dev = dev,
2279 .net = net,
2280 };
2281
2282 fib6_clean_all(net, fib6_ifdown, &adn);
2283 icmp6_clean_all(fib6_ifdown, &adn);
2284 }
2285
2286 struct rt6_mtu_change_arg {
2287 struct net_device *dev;
2288 unsigned int mtu;
2289 };
2290
2291 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2292 {
2293 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2294 struct inet6_dev *idev;
2295
2296 /* In IPv6 pmtu discovery is not optional,
2297 so that RTAX_MTU lock cannot disable it.
2298 We still use this lock to block changes
2299 caused by addrconf/ndisc.
2300 */
2301
2302 idev = __in6_dev_get(arg->dev);
2303 if (!idev)
2304 return 0;
2305
2306 /* For administrative MTU increase, there is no way to discover
2307 IPv6 PMTU increase, so PMTU increase should be updated here.
2308 Since RFC 1981 doesn't include administrative MTU increase
2309 update PMTU increase is a MUST. (i.e. jumbo frame)
2310 */
2311 /*
2312 If new MTU is less than route PMTU, this new MTU will be the
2313 lowest MTU in the path, update the route PMTU to reflect PMTU
2314 decreases; if new MTU is greater than route PMTU, and the
2315 old MTU is the lowest MTU in the path, update the route PMTU
2316 to reflect the increase. In this case if the other nodes' MTU
2317 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2318 PMTU discouvery.
2319 */
2320 if (rt->dst.dev == arg->dev &&
2321 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2322 (dst_mtu(&rt->dst) >= arg->mtu ||
2323 (dst_mtu(&rt->dst) < arg->mtu &&
2324 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2325 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2326 }
2327 return 0;
2328 }
2329
2330 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2331 {
2332 struct rt6_mtu_change_arg arg = {
2333 .dev = dev,
2334 .mtu = mtu,
2335 };
2336
2337 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2338 }
2339
2340 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2341 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2342 [RTA_OIF] = { .type = NLA_U32 },
2343 [RTA_IIF] = { .type = NLA_U32 },
2344 [RTA_PRIORITY] = { .type = NLA_U32 },
2345 [RTA_METRICS] = { .type = NLA_NESTED },
2346 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2347 };
2348
2349 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2350 struct fib6_config *cfg)
2351 {
2352 struct rtmsg *rtm;
2353 struct nlattr *tb[RTA_MAX+1];
2354 int err;
2355
2356 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2357 if (err < 0)
2358 goto errout;
2359
2360 err = -EINVAL;
2361 rtm = nlmsg_data(nlh);
2362 memset(cfg, 0, sizeof(*cfg));
2363
2364 cfg->fc_table = rtm->rtm_table;
2365 cfg->fc_dst_len = rtm->rtm_dst_len;
2366 cfg->fc_src_len = rtm->rtm_src_len;
2367 cfg->fc_flags = RTF_UP;
2368 cfg->fc_protocol = rtm->rtm_protocol;
2369 cfg->fc_type = rtm->rtm_type;
2370
2371 if (rtm->rtm_type == RTN_UNREACHABLE ||
2372 rtm->rtm_type == RTN_BLACKHOLE ||
2373 rtm->rtm_type == RTN_PROHIBIT ||
2374 rtm->rtm_type == RTN_THROW)
2375 cfg->fc_flags |= RTF_REJECT;
2376
2377 if (rtm->rtm_type == RTN_LOCAL)
2378 cfg->fc_flags |= RTF_LOCAL;
2379
2380 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2381 cfg->fc_nlinfo.nlh = nlh;
2382 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2383
2384 if (tb[RTA_GATEWAY]) {
2385 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2386 cfg->fc_flags |= RTF_GATEWAY;
2387 }
2388
2389 if (tb[RTA_DST]) {
2390 int plen = (rtm->rtm_dst_len + 7) >> 3;
2391
2392 if (nla_len(tb[RTA_DST]) < plen)
2393 goto errout;
2394
2395 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2396 }
2397
2398 if (tb[RTA_SRC]) {
2399 int plen = (rtm->rtm_src_len + 7) >> 3;
2400
2401 if (nla_len(tb[RTA_SRC]) < plen)
2402 goto errout;
2403
2404 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2405 }
2406
2407 if (tb[RTA_PREFSRC])
2408 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2409
2410 if (tb[RTA_OIF])
2411 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2412
2413 if (tb[RTA_PRIORITY])
2414 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2415
2416 if (tb[RTA_METRICS]) {
2417 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2418 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2419 }
2420
2421 if (tb[RTA_TABLE])
2422 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2423
2424 if (tb[RTA_MULTIPATH]) {
2425 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2426 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2427 }
2428
2429 err = 0;
2430 errout:
2431 return err;
2432 }
2433
2434 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2435 {
2436 struct fib6_config r_cfg;
2437 struct rtnexthop *rtnh;
2438 int remaining;
2439 int attrlen;
2440 int err = 0, last_err = 0;
2441
2442 beginning:
2443 rtnh = (struct rtnexthop *)cfg->fc_mp;
2444 remaining = cfg->fc_mp_len;
2445
2446 /* Parse a Multipath Entry */
2447 while (rtnh_ok(rtnh, remaining)) {
2448 memcpy(&r_cfg, cfg, sizeof(*cfg));
2449 if (rtnh->rtnh_ifindex)
2450 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2451
2452 attrlen = rtnh_attrlen(rtnh);
2453 if (attrlen > 0) {
2454 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2455
2456 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2457 if (nla) {
2458 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2459 r_cfg.fc_flags |= RTF_GATEWAY;
2460 }
2461 }
2462 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2463 if (err) {
2464 last_err = err;
2465 /* If we are trying to remove a route, do not stop the
2466 * loop when ip6_route_del() fails (because next hop is
2467 * already gone), we should try to remove all next hops.
2468 */
2469 if (add) {
2470 /* If add fails, we should try to delete all
2471 * next hops that have been already added.
2472 */
2473 add = 0;
2474 goto beginning;
2475 }
2476 }
2477 /* Because each route is added like a single route we remove
2478 * this flag after the first nexthop (if there is a collision,
2479 * we have already fail to add the first nexthop:
2480 * fib6_add_rt2node() has reject it).
2481 */
2482 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2483 rtnh = rtnh_next(rtnh, &remaining);
2484 }
2485
2486 return last_err;
2487 }
2488
2489 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2490 {
2491 struct fib6_config cfg;
2492 int err;
2493
2494 err = rtm_to_fib6_config(skb, nlh, &cfg);
2495 if (err < 0)
2496 return err;
2497
2498 if (cfg.fc_mp)
2499 return ip6_route_multipath(&cfg, 0);
2500 else
2501 return ip6_route_del(&cfg);
2502 }
2503
2504 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2505 {
2506 struct fib6_config cfg;
2507 int err;
2508
2509 err = rtm_to_fib6_config(skb, nlh, &cfg);
2510 if (err < 0)
2511 return err;
2512
2513 if (cfg.fc_mp)
2514 return ip6_route_multipath(&cfg, 1);
2515 else
2516 return ip6_route_add(&cfg);
2517 }
2518
2519 static inline size_t rt6_nlmsg_size(void)
2520 {
2521 return NLMSG_ALIGN(sizeof(struct rtmsg))
2522 + nla_total_size(16) /* RTA_SRC */
2523 + nla_total_size(16) /* RTA_DST */
2524 + nla_total_size(16) /* RTA_GATEWAY */
2525 + nla_total_size(16) /* RTA_PREFSRC */
2526 + nla_total_size(4) /* RTA_TABLE */
2527 + nla_total_size(4) /* RTA_IIF */
2528 + nla_total_size(4) /* RTA_OIF */
2529 + nla_total_size(4) /* RTA_PRIORITY */
2530 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2531 + nla_total_size(sizeof(struct rta_cacheinfo));
2532 }
2533
2534 static int rt6_fill_node(struct net *net,
2535 struct sk_buff *skb, struct rt6_info *rt,
2536 struct in6_addr *dst, struct in6_addr *src,
2537 int iif, int type, u32 portid, u32 seq,
2538 int prefix, int nowait, unsigned int flags)
2539 {
2540 struct rtmsg *rtm;
2541 struct nlmsghdr *nlh;
2542 long expires;
2543 u32 table;
2544
2545 if (prefix) { /* user wants prefix routes only */
2546 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2547 /* success since this is not a prefix route */
2548 return 1;
2549 }
2550 }
2551
2552 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2553 if (!nlh)
2554 return -EMSGSIZE;
2555
2556 rtm = nlmsg_data(nlh);
2557 rtm->rtm_family = AF_INET6;
2558 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2559 rtm->rtm_src_len = rt->rt6i_src.plen;
2560 rtm->rtm_tos = 0;
2561 if (rt->rt6i_table)
2562 table = rt->rt6i_table->tb6_id;
2563 else
2564 table = RT6_TABLE_UNSPEC;
2565 rtm->rtm_table = table;
2566 if (nla_put_u32(skb, RTA_TABLE, table))
2567 goto nla_put_failure;
2568 if (rt->rt6i_flags & RTF_REJECT) {
2569 switch (rt->dst.error) {
2570 case -EINVAL:
2571 rtm->rtm_type = RTN_BLACKHOLE;
2572 break;
2573 case -EACCES:
2574 rtm->rtm_type = RTN_PROHIBIT;
2575 break;
2576 case -EAGAIN:
2577 rtm->rtm_type = RTN_THROW;
2578 break;
2579 default:
2580 rtm->rtm_type = RTN_UNREACHABLE;
2581 break;
2582 }
2583 }
2584 else if (rt->rt6i_flags & RTF_LOCAL)
2585 rtm->rtm_type = RTN_LOCAL;
2586 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2587 rtm->rtm_type = RTN_LOCAL;
2588 else
2589 rtm->rtm_type = RTN_UNICAST;
2590 rtm->rtm_flags = 0;
2591 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2592 rtm->rtm_protocol = rt->rt6i_protocol;
2593 if (rt->rt6i_flags & RTF_DYNAMIC)
2594 rtm->rtm_protocol = RTPROT_REDIRECT;
2595 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2596 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2597 rtm->rtm_protocol = RTPROT_RA;
2598 else
2599 rtm->rtm_protocol = RTPROT_KERNEL;
2600 }
2601
2602 if (rt->rt6i_flags & RTF_CACHE)
2603 rtm->rtm_flags |= RTM_F_CLONED;
2604
2605 if (dst) {
2606 if (nla_put(skb, RTA_DST, 16, dst))
2607 goto nla_put_failure;
2608 rtm->rtm_dst_len = 128;
2609 } else if (rtm->rtm_dst_len)
2610 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2611 goto nla_put_failure;
2612 #ifdef CONFIG_IPV6_SUBTREES
2613 if (src) {
2614 if (nla_put(skb, RTA_SRC, 16, src))
2615 goto nla_put_failure;
2616 rtm->rtm_src_len = 128;
2617 } else if (rtm->rtm_src_len &&
2618 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2619 goto nla_put_failure;
2620 #endif
2621 if (iif) {
2622 #ifdef CONFIG_IPV6_MROUTE
2623 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2624 int err = ip6mr_get_route(net, skb, rtm, nowait);
2625 if (err <= 0) {
2626 if (!nowait) {
2627 if (err == 0)
2628 return 0;
2629 goto nla_put_failure;
2630 } else {
2631 if (err == -EMSGSIZE)
2632 goto nla_put_failure;
2633 }
2634 }
2635 } else
2636 #endif
2637 if (nla_put_u32(skb, RTA_IIF, iif))
2638 goto nla_put_failure;
2639 } else if (dst) {
2640 struct in6_addr saddr_buf;
2641 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2642 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2643 goto nla_put_failure;
2644 }
2645
2646 if (rt->rt6i_prefsrc.plen) {
2647 struct in6_addr saddr_buf;
2648 saddr_buf = rt->rt6i_prefsrc.addr;
2649 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2650 goto nla_put_failure;
2651 }
2652
2653 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2654 goto nla_put_failure;
2655
2656 if (rt->rt6i_flags & RTF_GATEWAY) {
2657 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2658 goto nla_put_failure;
2659 }
2660
2661 if (rt->dst.dev &&
2662 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2663 goto nla_put_failure;
2664 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2665 goto nla_put_failure;
2666
2667 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2668
2669 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2670 goto nla_put_failure;
2671
2672 return nlmsg_end(skb, nlh);
2673
2674 nla_put_failure:
2675 nlmsg_cancel(skb, nlh);
2676 return -EMSGSIZE;
2677 }
2678
2679 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2680 {
2681 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2682 int prefix;
2683
2684 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2685 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2686 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2687 } else
2688 prefix = 0;
2689
2690 return rt6_fill_node(arg->net,
2691 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2692 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2693 prefix, 0, NLM_F_MULTI);
2694 }
2695
2696 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2697 {
2698 struct net *net = sock_net(in_skb->sk);
2699 struct nlattr *tb[RTA_MAX+1];
2700 struct rt6_info *rt;
2701 struct sk_buff *skb;
2702 struct rtmsg *rtm;
2703 struct flowi6 fl6;
2704 int err, iif = 0, oif = 0;
2705
2706 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2707 if (err < 0)
2708 goto errout;
2709
2710 err = -EINVAL;
2711 memset(&fl6, 0, sizeof(fl6));
2712
2713 if (tb[RTA_SRC]) {
2714 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2715 goto errout;
2716
2717 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2718 }
2719
2720 if (tb[RTA_DST]) {
2721 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2722 goto errout;
2723
2724 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2725 }
2726
2727 if (tb[RTA_IIF])
2728 iif = nla_get_u32(tb[RTA_IIF]);
2729
2730 if (tb[RTA_OIF])
2731 oif = nla_get_u32(tb[RTA_OIF]);
2732
2733 if (tb[RTA_MARK])
2734 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
2735
2736 if (iif) {
2737 struct net_device *dev;
2738 int flags = 0;
2739
2740 dev = __dev_get_by_index(net, iif);
2741 if (!dev) {
2742 err = -ENODEV;
2743 goto errout;
2744 }
2745
2746 fl6.flowi6_iif = iif;
2747
2748 if (!ipv6_addr_any(&fl6.saddr))
2749 flags |= RT6_LOOKUP_F_HAS_SADDR;
2750
2751 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2752 flags);
2753 } else {
2754 fl6.flowi6_oif = oif;
2755
2756 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2757 }
2758
2759 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2760 if (!skb) {
2761 ip6_rt_put(rt);
2762 err = -ENOBUFS;
2763 goto errout;
2764 }
2765
2766 /* Reserve room for dummy headers, this skb can pass
2767 through good chunk of routing engine.
2768 */
2769 skb_reset_mac_header(skb);
2770 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2771
2772 skb_dst_set(skb, &rt->dst);
2773
2774 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2775 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2776 nlh->nlmsg_seq, 0, 0, 0);
2777 if (err < 0) {
2778 kfree_skb(skb);
2779 goto errout;
2780 }
2781
2782 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2783 errout:
2784 return err;
2785 }
2786
2787 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2788 {
2789 struct sk_buff *skb;
2790 struct net *net = info->nl_net;
2791 u32 seq;
2792 int err;
2793
2794 err = -ENOBUFS;
2795 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2796
2797 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2798 if (!skb)
2799 goto errout;
2800
2801 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2802 event, info->portid, seq, 0, 0, 0);
2803 if (err < 0) {
2804 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2805 WARN_ON(err == -EMSGSIZE);
2806 kfree_skb(skb);
2807 goto errout;
2808 }
2809 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2810 info->nlh, gfp_any());
2811 return;
2812 errout:
2813 if (err < 0)
2814 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2815 }
2816
2817 static int ip6_route_dev_notify(struct notifier_block *this,
2818 unsigned long event, void *ptr)
2819 {
2820 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2821 struct net *net = dev_net(dev);
2822
2823 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2824 net->ipv6.ip6_null_entry->dst.dev = dev;
2825 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2826 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2827 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2828 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2829 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2830 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2831 #endif
2832 }
2833
2834 return NOTIFY_OK;
2835 }
2836
2837 /*
2838 * /proc
2839 */
2840
2841 #ifdef CONFIG_PROC_FS
2842
2843 static const struct file_operations ipv6_route_proc_fops = {
2844 .owner = THIS_MODULE,
2845 .open = ipv6_route_open,
2846 .read = seq_read,
2847 .llseek = seq_lseek,
2848 .release = seq_release_net,
2849 };
2850
2851 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2852 {
2853 struct net *net = (struct net *)seq->private;
2854 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2855 net->ipv6.rt6_stats->fib_nodes,
2856 net->ipv6.rt6_stats->fib_route_nodes,
2857 net->ipv6.rt6_stats->fib_rt_alloc,
2858 net->ipv6.rt6_stats->fib_rt_entries,
2859 net->ipv6.rt6_stats->fib_rt_cache,
2860 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2861 net->ipv6.rt6_stats->fib_discarded_routes);
2862
2863 return 0;
2864 }
2865
2866 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2867 {
2868 return single_open_net(inode, file, rt6_stats_seq_show);
2869 }
2870
2871 static const struct file_operations rt6_stats_seq_fops = {
2872 .owner = THIS_MODULE,
2873 .open = rt6_stats_seq_open,
2874 .read = seq_read,
2875 .llseek = seq_lseek,
2876 .release = single_release_net,
2877 };
2878 #endif /* CONFIG_PROC_FS */
2879
2880 #ifdef CONFIG_SYSCTL
2881
2882 static
2883 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2884 void __user *buffer, size_t *lenp, loff_t *ppos)
2885 {
2886 struct net *net;
2887 int delay;
2888 if (!write)
2889 return -EINVAL;
2890
2891 net = (struct net *)ctl->extra1;
2892 delay = net->ipv6.sysctl.flush_delay;
2893 proc_dointvec(ctl, write, buffer, lenp, ppos);
2894 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2895 return 0;
2896 }
2897
2898 struct ctl_table ipv6_route_table_template[] = {
2899 {
2900 .procname = "flush",
2901 .data = &init_net.ipv6.sysctl.flush_delay,
2902 .maxlen = sizeof(int),
2903 .mode = 0200,
2904 .proc_handler = ipv6_sysctl_rtcache_flush
2905 },
2906 {
2907 .procname = "gc_thresh",
2908 .data = &ip6_dst_ops_template.gc_thresh,
2909 .maxlen = sizeof(int),
2910 .mode = 0644,
2911 .proc_handler = proc_dointvec,
2912 },
2913 {
2914 .procname = "max_size",
2915 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2916 .maxlen = sizeof(int),
2917 .mode = 0644,
2918 .proc_handler = proc_dointvec,
2919 },
2920 {
2921 .procname = "gc_min_interval",
2922 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2923 .maxlen = sizeof(int),
2924 .mode = 0644,
2925 .proc_handler = proc_dointvec_jiffies,
2926 },
2927 {
2928 .procname = "gc_timeout",
2929 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2930 .maxlen = sizeof(int),
2931 .mode = 0644,
2932 .proc_handler = proc_dointvec_jiffies,
2933 },
2934 {
2935 .procname = "gc_interval",
2936 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2937 .maxlen = sizeof(int),
2938 .mode = 0644,
2939 .proc_handler = proc_dointvec_jiffies,
2940 },
2941 {
2942 .procname = "gc_elasticity",
2943 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2944 .maxlen = sizeof(int),
2945 .mode = 0644,
2946 .proc_handler = proc_dointvec,
2947 },
2948 {
2949 .procname = "mtu_expires",
2950 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2951 .maxlen = sizeof(int),
2952 .mode = 0644,
2953 .proc_handler = proc_dointvec_jiffies,
2954 },
2955 {
2956 .procname = "min_adv_mss",
2957 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2958 .maxlen = sizeof(int),
2959 .mode = 0644,
2960 .proc_handler = proc_dointvec,
2961 },
2962 {
2963 .procname = "gc_min_interval_ms",
2964 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2965 .maxlen = sizeof(int),
2966 .mode = 0644,
2967 .proc_handler = proc_dointvec_ms_jiffies,
2968 },
2969 { }
2970 };
2971
2972 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2973 {
2974 struct ctl_table *table;
2975
2976 table = kmemdup(ipv6_route_table_template,
2977 sizeof(ipv6_route_table_template),
2978 GFP_KERNEL);
2979
2980 if (table) {
2981 table[0].data = &net->ipv6.sysctl.flush_delay;
2982 table[0].extra1 = net;
2983 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2984 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2985 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2986 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2987 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2988 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2989 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2990 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2991 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2992
2993 /* Don't export sysctls to unprivileged users */
2994 if (net->user_ns != &init_user_ns)
2995 table[0].procname = NULL;
2996 }
2997
2998 return table;
2999 }
3000 #endif
3001
3002 static int __net_init ip6_route_net_init(struct net *net)
3003 {
3004 int ret = -ENOMEM;
3005
3006 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3007 sizeof(net->ipv6.ip6_dst_ops));
3008
3009 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3010 goto out_ip6_dst_ops;
3011
3012 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3013 sizeof(*net->ipv6.ip6_null_entry),
3014 GFP_KERNEL);
3015 if (!net->ipv6.ip6_null_entry)
3016 goto out_ip6_dst_entries;
3017 net->ipv6.ip6_null_entry->dst.path =
3018 (struct dst_entry *)net->ipv6.ip6_null_entry;
3019 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3020 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3021 ip6_template_metrics, true);
3022
3023 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3024 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3025 sizeof(*net->ipv6.ip6_prohibit_entry),
3026 GFP_KERNEL);
3027 if (!net->ipv6.ip6_prohibit_entry)
3028 goto out_ip6_null_entry;
3029 net->ipv6.ip6_prohibit_entry->dst.path =
3030 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3031 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3032 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3033 ip6_template_metrics, true);
3034
3035 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3036 sizeof(*net->ipv6.ip6_blk_hole_entry),
3037 GFP_KERNEL);
3038 if (!net->ipv6.ip6_blk_hole_entry)
3039 goto out_ip6_prohibit_entry;
3040 net->ipv6.ip6_blk_hole_entry->dst.path =
3041 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3042 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3043 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3044 ip6_template_metrics, true);
3045 #endif
3046
3047 net->ipv6.sysctl.flush_delay = 0;
3048 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3049 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3050 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3051 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3052 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3053 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3054 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3055
3056 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3057
3058 ret = 0;
3059 out:
3060 return ret;
3061
3062 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3063 out_ip6_prohibit_entry:
3064 kfree(net->ipv6.ip6_prohibit_entry);
3065 out_ip6_null_entry:
3066 kfree(net->ipv6.ip6_null_entry);
3067 #endif
3068 out_ip6_dst_entries:
3069 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3070 out_ip6_dst_ops:
3071 goto out;
3072 }
3073
3074 static void __net_exit ip6_route_net_exit(struct net *net)
3075 {
3076 kfree(net->ipv6.ip6_null_entry);
3077 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3078 kfree(net->ipv6.ip6_prohibit_entry);
3079 kfree(net->ipv6.ip6_blk_hole_entry);
3080 #endif
3081 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3082 }
3083
3084 static int __net_init ip6_route_net_init_late(struct net *net)
3085 {
3086 #ifdef CONFIG_PROC_FS
3087 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3088 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3089 #endif
3090 return 0;
3091 }
3092
3093 static void __net_exit ip6_route_net_exit_late(struct net *net)
3094 {
3095 #ifdef CONFIG_PROC_FS
3096 remove_proc_entry("ipv6_route", net->proc_net);
3097 remove_proc_entry("rt6_stats", net->proc_net);
3098 #endif
3099 }
3100
3101 static struct pernet_operations ip6_route_net_ops = {
3102 .init = ip6_route_net_init,
3103 .exit = ip6_route_net_exit,
3104 };
3105
3106 static int __net_init ipv6_inetpeer_init(struct net *net)
3107 {
3108 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3109
3110 if (!bp)
3111 return -ENOMEM;
3112 inet_peer_base_init(bp);
3113 net->ipv6.peers = bp;
3114 return 0;
3115 }
3116
3117 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3118 {
3119 struct inet_peer_base *bp = net->ipv6.peers;
3120
3121 net->ipv6.peers = NULL;
3122 inetpeer_invalidate_tree(bp);
3123 kfree(bp);
3124 }
3125
3126 static struct pernet_operations ipv6_inetpeer_ops = {
3127 .init = ipv6_inetpeer_init,
3128 .exit = ipv6_inetpeer_exit,
3129 };
3130
3131 static struct pernet_operations ip6_route_net_late_ops = {
3132 .init = ip6_route_net_init_late,
3133 .exit = ip6_route_net_exit_late,
3134 };
3135
3136 static struct notifier_block ip6_route_dev_notifier = {
3137 .notifier_call = ip6_route_dev_notify,
3138 .priority = 0,
3139 };
3140
3141 int __init ip6_route_init(void)
3142 {
3143 int ret;
3144
3145 ret = -ENOMEM;
3146 ip6_dst_ops_template.kmem_cachep =
3147 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3148 SLAB_HWCACHE_ALIGN, NULL);
3149 if (!ip6_dst_ops_template.kmem_cachep)
3150 goto out;
3151
3152 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3153 if (ret)
3154 goto out_kmem_cache;
3155
3156 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3157 if (ret)
3158 goto out_dst_entries;
3159
3160 ret = register_pernet_subsys(&ip6_route_net_ops);
3161 if (ret)
3162 goto out_register_inetpeer;
3163
3164 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3165
3166 /* Registering of the loopback is done before this portion of code,
3167 * the loopback reference in rt6_info will not be taken, do it
3168 * manually for init_net */
3169 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3170 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3171 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3172 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3173 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3174 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3175 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3176 #endif
3177 ret = fib6_init();
3178 if (ret)
3179 goto out_register_subsys;
3180
3181 ret = xfrm6_init();
3182 if (ret)
3183 goto out_fib6_init;
3184
3185 ret = fib6_rules_init();
3186 if (ret)
3187 goto xfrm6_init;
3188
3189 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3190 if (ret)
3191 goto fib6_rules_init;
3192
3193 ret = -ENOBUFS;
3194 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3195 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3196 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3197 goto out_register_late_subsys;
3198
3199 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3200 if (ret)
3201 goto out_register_late_subsys;
3202
3203 out:
3204 return ret;
3205
3206 out_register_late_subsys:
3207 unregister_pernet_subsys(&ip6_route_net_late_ops);
3208 fib6_rules_init:
3209 fib6_rules_cleanup();
3210 xfrm6_init:
3211 xfrm6_fini();
3212 out_fib6_init:
3213 fib6_gc_cleanup();
3214 out_register_subsys:
3215 unregister_pernet_subsys(&ip6_route_net_ops);
3216 out_register_inetpeer:
3217 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3218 out_dst_entries:
3219 dst_entries_destroy(&ip6_dst_blackhole_ops);
3220 out_kmem_cache:
3221 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3222 goto out;
3223 }
3224
3225 void ip6_route_cleanup(void)
3226 {
3227 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3228 unregister_pernet_subsys(&ip6_route_net_late_ops);
3229 fib6_rules_cleanup();
3230 xfrm6_fini();
3231 fib6_gc_cleanup();
3232 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3233 unregister_pernet_subsys(&ip6_route_net_ops);
3234 dst_entries_destroy(&ip6_dst_blackhole_ops);
3235 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3236 }
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