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ipv6: Do not depend on rt->n in rt6_check_neigh().
[linux-2.6.git] / net / ipv6 / route.c
blobc7bcd777db230e8e46e2804eac1453353f8bd2a3
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 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
69 const struct in6_addr *dest);
70 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
71 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
72 static unsigned int ip6_mtu(const struct dst_entry *dst);
73 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
74 static void ip6_dst_destroy(struct dst_entry *);
75 static void ip6_dst_ifdown(struct dst_entry *,
76 struct net_device *dev, int how);
77 static int ip6_dst_gc(struct dst_ops *ops);
78
79 static int ip6_pkt_discard(struct sk_buff *skb);
80 static int ip6_pkt_discard_out(struct sk_buff *skb);
81 static void ip6_link_failure(struct sk_buff *skb);
82 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
83 struct sk_buff *skb, u32 mtu);
84 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
85 struct sk_buff *skb);
86
87 #ifdef CONFIG_IPV6_ROUTE_INFO
88 static struct rt6_info *rt6_add_route_info(struct net *net,
89 const struct in6_addr *prefix, int prefixlen,
90 const struct in6_addr *gwaddr, int ifindex,
91 unsigned int pref);
92 static struct rt6_info *rt6_get_route_info(struct net *net,
93 const struct in6_addr *prefix, int prefixlen,
94 const struct in6_addr *gwaddr, int ifindex);
95 #endif
96
97 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
98 {
99 struct rt6_info *rt = (struct rt6_info *) dst;
100 struct inet_peer *peer;
101 u32 *p = NULL;
102
103 if (!(rt->dst.flags & DST_HOST))
104 return NULL;
105
106 peer = rt6_get_peer_create(rt);
107 if (peer) {
108 u32 *old_p = __DST_METRICS_PTR(old);
109 unsigned long prev, new;
110
111 p = peer->metrics;
112 if (inet_metrics_new(peer))
113 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
114
115 new = (unsigned long) p;
116 prev = cmpxchg(&dst->_metrics, old, new);
117
118 if (prev != old) {
119 p = __DST_METRICS_PTR(prev);
120 if (prev & DST_METRICS_READ_ONLY)
121 p = NULL;
122 }
123 }
124 return p;
125 }
126
127 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
128 struct sk_buff *skb,
129 const void *daddr)
130 {
131 struct in6_addr *p = &rt->rt6i_gateway;
132
133 if (!ipv6_addr_any(p))
134 return (const void *) p;
135 else if (skb)
136 return &ipv6_hdr(skb)->daddr;
137 return daddr;
138 }
139
140 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
141 struct sk_buff *skb,
142 const void *daddr)
143 {
144 struct rt6_info *rt = (struct rt6_info *) dst;
145 struct neighbour *n;
146
147 daddr = choose_neigh_daddr(rt, skb, daddr);
148 n = __ipv6_neigh_lookup(dst->dev, daddr);
149 if (n)
150 return n;
151 return neigh_create(&nd_tbl, daddr, dst->dev);
152 }
153
154 static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
155 {
156 struct neighbour *n = __ipv6_neigh_lookup(dev, &rt->rt6i_gateway);
157 if (!n) {
158 n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev);
159 if (IS_ERR(n))
160 return PTR_ERR(n);
161 }
162 rt->n = n;
163
164 return 0;
165 }
166
167 static struct dst_ops ip6_dst_ops_template = {
168 .family = AF_INET6,
169 .protocol = cpu_to_be16(ETH_P_IPV6),
170 .gc = ip6_dst_gc,
171 .gc_thresh = 1024,
172 .check = ip6_dst_check,
173 .default_advmss = ip6_default_advmss,
174 .mtu = ip6_mtu,
175 .cow_metrics = ipv6_cow_metrics,
176 .destroy = ip6_dst_destroy,
177 .ifdown = ip6_dst_ifdown,
178 .negative_advice = ip6_negative_advice,
179 .link_failure = ip6_link_failure,
180 .update_pmtu = ip6_rt_update_pmtu,
181 .redirect = rt6_do_redirect,
182 .local_out = __ip6_local_out,
183 .neigh_lookup = ip6_neigh_lookup,
184 };
185
186 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
187 {
188 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
189
190 return mtu ? : dst->dev->mtu;
191 }
192
193 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
194 struct sk_buff *skb, u32 mtu)
195 {
196 }
197
198 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
199 struct sk_buff *skb)
200 {
201 }
202
203 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
204 unsigned long old)
205 {
206 return NULL;
207 }
208
209 static struct dst_ops ip6_dst_blackhole_ops = {
210 .family = AF_INET6,
211 .protocol = cpu_to_be16(ETH_P_IPV6),
212 .destroy = ip6_dst_destroy,
213 .check = ip6_dst_check,
214 .mtu = ip6_blackhole_mtu,
215 .default_advmss = ip6_default_advmss,
216 .update_pmtu = ip6_rt_blackhole_update_pmtu,
217 .redirect = ip6_rt_blackhole_redirect,
218 .cow_metrics = ip6_rt_blackhole_cow_metrics,
219 .neigh_lookup = ip6_neigh_lookup,
220 };
221
222 static const u32 ip6_template_metrics[RTAX_MAX] = {
223 [RTAX_HOPLIMIT - 1] = 0,
224 };
225
226 static const struct rt6_info ip6_null_entry_template = {
227 .dst = {
228 .__refcnt = ATOMIC_INIT(1),
229 .__use = 1,
230 .obsolete = DST_OBSOLETE_FORCE_CHK,
231 .error = -ENETUNREACH,
232 .input = ip6_pkt_discard,
233 .output = ip6_pkt_discard_out,
234 },
235 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
236 .rt6i_protocol = RTPROT_KERNEL,
237 .rt6i_metric = ~(u32) 0,
238 .rt6i_ref = ATOMIC_INIT(1),
239 };
240
241 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
242
243 static int ip6_pkt_prohibit(struct sk_buff *skb);
244 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
245
246 static const struct rt6_info ip6_prohibit_entry_template = {
247 .dst = {
248 .__refcnt = ATOMIC_INIT(1),
249 .__use = 1,
250 .obsolete = DST_OBSOLETE_FORCE_CHK,
251 .error = -EACCES,
252 .input = ip6_pkt_prohibit,
253 .output = ip6_pkt_prohibit_out,
254 },
255 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
256 .rt6i_protocol = RTPROT_KERNEL,
257 .rt6i_metric = ~(u32) 0,
258 .rt6i_ref = ATOMIC_INIT(1),
259 };
260
261 static const struct rt6_info ip6_blk_hole_entry_template = {
262 .dst = {
263 .__refcnt = ATOMIC_INIT(1),
264 .__use = 1,
265 .obsolete = DST_OBSOLETE_FORCE_CHK,
266 .error = -EINVAL,
267 .input = dst_discard,
268 .output = dst_discard,
269 },
270 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
271 .rt6i_protocol = RTPROT_KERNEL,
272 .rt6i_metric = ~(u32) 0,
273 .rt6i_ref = ATOMIC_INIT(1),
274 };
275
276 #endif
277
278 /* allocate dst with ip6_dst_ops */
279 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
280 struct net_device *dev,
281 int flags,
282 struct fib6_table *table)
283 {
284 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
285 0, DST_OBSOLETE_FORCE_CHK, flags);
286
287 if (rt) {
288 struct dst_entry *dst = &rt->dst;
289
290 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
291 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
292 rt->rt6i_genid = rt_genid(net);
293 INIT_LIST_HEAD(&rt->rt6i_siblings);
294 rt->rt6i_nsiblings = 0;
295 }
296 return rt;
297 }
298
299 static void ip6_dst_destroy(struct dst_entry *dst)
300 {
301 struct rt6_info *rt = (struct rt6_info *)dst;
302 struct inet6_dev *idev = rt->rt6i_idev;
303
304 if (rt->n)
305 neigh_release(rt->n);
306
307 if (!(rt->dst.flags & DST_HOST))
308 dst_destroy_metrics_generic(dst);
309
310 if (idev) {
311 rt->rt6i_idev = NULL;
312 in6_dev_put(idev);
313 }
314
315 if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from)
316 dst_release(dst->from);
317
318 if (rt6_has_peer(rt)) {
319 struct inet_peer *peer = rt6_peer_ptr(rt);
320 inet_putpeer(peer);
321 }
322 }
323
324 void rt6_bind_peer(struct rt6_info *rt, int create)
325 {
326 struct inet_peer_base *base;
327 struct inet_peer *peer;
328
329 base = inetpeer_base_ptr(rt->_rt6i_peer);
330 if (!base)
331 return;
332
333 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
334 if (peer) {
335 if (!rt6_set_peer(rt, peer))
336 inet_putpeer(peer);
337 }
338 }
339
340 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
341 int how)
342 {
343 struct rt6_info *rt = (struct rt6_info *)dst;
344 struct inet6_dev *idev = rt->rt6i_idev;
345 struct net_device *loopback_dev =
346 dev_net(dev)->loopback_dev;
347
348 if (dev != loopback_dev) {
349 if (idev && idev->dev == dev) {
350 struct inet6_dev *loopback_idev =
351 in6_dev_get(loopback_dev);
352 if (loopback_idev) {
353 rt->rt6i_idev = loopback_idev;
354 in6_dev_put(idev);
355 }
356 }
357 if (rt->n && rt->n->dev == dev) {
358 rt->n->dev = loopback_dev;
359 dev_hold(loopback_dev);
360 dev_put(dev);
361 }
362 }
363 }
364
365 static bool rt6_check_expired(const struct rt6_info *rt)
366 {
367 if (rt->rt6i_flags & RTF_EXPIRES) {
368 if (time_after(jiffies, rt->dst.expires))
369 return true;
370 } else if (rt->dst.from) {
371 return rt6_check_expired((struct rt6_info *) rt->dst.from);
372 }
373 return false;
374 }
375
376 static bool rt6_need_strict(const struct in6_addr *daddr)
377 {
378 return ipv6_addr_type(daddr) &
379 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
380 }
381
382 /* Multipath route selection:
383 * Hash based function using packet header and flowlabel.
384 * Adapted from fib_info_hashfn()
385 */
386 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
387 const struct flowi6 *fl6)
388 {
389 unsigned int val = fl6->flowi6_proto;
390
391 val ^= ipv6_addr_hash(&fl6->daddr);
392 val ^= ipv6_addr_hash(&fl6->saddr);
393
394 /* Work only if this not encapsulated */
395 switch (fl6->flowi6_proto) {
396 case IPPROTO_UDP:
397 case IPPROTO_TCP:
398 case IPPROTO_SCTP:
399 val ^= (__force u16)fl6->fl6_sport;
400 val ^= (__force u16)fl6->fl6_dport;
401 break;
402
403 case IPPROTO_ICMPV6:
404 val ^= (__force u16)fl6->fl6_icmp_type;
405 val ^= (__force u16)fl6->fl6_icmp_code;
406 break;
407 }
408 /* RFC6438 recommands to use flowlabel */
409 val ^= (__force u32)fl6->flowlabel;
410
411 /* Perhaps, we need to tune, this function? */
412 val = val ^ (val >> 7) ^ (val >> 12);
413 return val % candidate_count;
414 }
415
416 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
417 struct flowi6 *fl6)
418 {
419 struct rt6_info *sibling, *next_sibling;
420 int route_choosen;
421
422 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
423 /* Don't change the route, if route_choosen == 0
424 * (siblings does not include ourself)
425 */
426 if (route_choosen)
427 list_for_each_entry_safe(sibling, next_sibling,
428 &match->rt6i_siblings, rt6i_siblings) {
429 route_choosen--;
430 if (route_choosen == 0) {
431 match = sibling;
432 break;
433 }
434 }
435 return match;
436 }
437
438 /*
439 * Route lookup. Any table->tb6_lock is implied.
440 */
441
442 static inline struct rt6_info *rt6_device_match(struct net *net,
443 struct rt6_info *rt,
444 const struct in6_addr *saddr,
445 int oif,
446 int flags)
447 {
448 struct rt6_info *local = NULL;
449 struct rt6_info *sprt;
450
451 if (!oif && ipv6_addr_any(saddr))
452 goto out;
453
454 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
455 struct net_device *dev = sprt->dst.dev;
456
457 if (oif) {
458 if (dev->ifindex == oif)
459 return sprt;
460 if (dev->flags & IFF_LOOPBACK) {
461 if (!sprt->rt6i_idev ||
462 sprt->rt6i_idev->dev->ifindex != oif) {
463 if (flags & RT6_LOOKUP_F_IFACE && oif)
464 continue;
465 if (local && (!oif ||
466 local->rt6i_idev->dev->ifindex == oif))
467 continue;
468 }
469 local = sprt;
470 }
471 } else {
472 if (ipv6_chk_addr(net, saddr, dev,
473 flags & RT6_LOOKUP_F_IFACE))
474 return sprt;
475 }
476 }
477
478 if (oif) {
479 if (local)
480 return local;
481
482 if (flags & RT6_LOOKUP_F_IFACE)
483 return net->ipv6.ip6_null_entry;
484 }
485 out:
486 return rt;
487 }
488
489 #ifdef CONFIG_IPV6_ROUTER_PREF
490 static void rt6_probe(struct rt6_info *rt)
491 {
492 struct neighbour *neigh;
493 /*
494 * Okay, this does not seem to be appropriate
495 * for now, however, we need to check if it
496 * is really so; aka Router Reachability Probing.
497 *
498 * Router Reachability Probe MUST be rate-limited
499 * to no more than one per minute.
500 */
501 neigh = rt ? rt->n : NULL;
502 if (!neigh)
503 return;
504 write_lock_bh(&neigh->lock);
505 if (neigh->nud_state & NUD_VALID) {
506 write_unlock_bh(&neigh->lock);
507 return;
508 }
509 if (!(neigh->nud_state & NUD_VALID) &&
510 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
511 struct in6_addr mcaddr;
512 struct in6_addr *target;
513
514 neigh->updated = jiffies;
515 write_unlock_bh(&neigh->lock);
516
517 target = (struct in6_addr *)&neigh->primary_key;
518 addrconf_addr_solict_mult(target, &mcaddr);
519 ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL);
520 } else {
521 write_unlock_bh(&neigh->lock);
522 }
523 }
524 #else
525 static inline void rt6_probe(struct rt6_info *rt)
526 {
527 }
528 #endif
529
530 /*
531 * Default Router Selection (RFC 2461 6.3.6)
532 */
533 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
534 {
535 struct net_device *dev = rt->dst.dev;
536 if (!oif || dev->ifindex == oif)
537 return 2;
538 if ((dev->flags & IFF_LOOPBACK) &&
539 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
540 return 1;
541 return 0;
542 }
543
544 static inline bool rt6_check_neigh(struct rt6_info *rt)
545 {
546 struct neighbour *neigh;
547 bool ret = false;
548
549 if (rt->rt6i_flags & RTF_NONEXTHOP ||
550 !(rt->rt6i_flags & RTF_GATEWAY))
551 return true;
552
553 rcu_read_lock_bh();
554 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
555 if (neigh) {
556 read_lock(&neigh->lock);
557 if (neigh->nud_state & NUD_VALID)
558 ret = true;
559 #ifdef CONFIG_IPV6_ROUTER_PREF
560 else if (!(neigh->nud_state & NUD_FAILED))
561 ret = true;
562 #endif
563 read_unlock(&neigh->lock);
564 }
565 rcu_read_unlock_bh();
566
567 return ret;
568 }
569
570 static int rt6_score_route(struct rt6_info *rt, int oif,
571 int strict)
572 {
573 int m;
574
575 m = rt6_check_dev(rt, oif);
576 if (!m && (strict & RT6_LOOKUP_F_IFACE))
577 return -1;
578 #ifdef CONFIG_IPV6_ROUTER_PREF
579 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
580 #endif
581 if (!rt6_check_neigh(rt) && (strict & RT6_LOOKUP_F_REACHABLE))
582 return -1;
583 return m;
584 }
585
586 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
587 int *mpri, struct rt6_info *match)
588 {
589 int m;
590
591 if (rt6_check_expired(rt))
592 goto out;
593
594 m = rt6_score_route(rt, oif, strict);
595 if (m < 0)
596 goto out;
597
598 if (m > *mpri) {
599 if (strict & RT6_LOOKUP_F_REACHABLE)
600 rt6_probe(match);
601 *mpri = m;
602 match = rt;
603 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
604 rt6_probe(rt);
605 }
606
607 out:
608 return match;
609 }
610
611 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
612 struct rt6_info *rr_head,
613 u32 metric, int oif, int strict)
614 {
615 struct rt6_info *rt, *match;
616 int mpri = -1;
617
618 match = NULL;
619 for (rt = rr_head; rt && rt->rt6i_metric == metric;
620 rt = rt->dst.rt6_next)
621 match = find_match(rt, oif, strict, &mpri, match);
622 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
623 rt = rt->dst.rt6_next)
624 match = find_match(rt, oif, strict, &mpri, match);
625
626 return match;
627 }
628
629 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
630 {
631 struct rt6_info *match, *rt0;
632 struct net *net;
633
634 rt0 = fn->rr_ptr;
635 if (!rt0)
636 fn->rr_ptr = rt0 = fn->leaf;
637
638 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
639
640 if (!match &&
641 (strict & RT6_LOOKUP_F_REACHABLE)) {
642 struct rt6_info *next = rt0->dst.rt6_next;
643
644 /* no entries matched; do round-robin */
645 if (!next || next->rt6i_metric != rt0->rt6i_metric)
646 next = fn->leaf;
647
648 if (next != rt0)
649 fn->rr_ptr = next;
650 }
651
652 net = dev_net(rt0->dst.dev);
653 return match ? match : net->ipv6.ip6_null_entry;
654 }
655
656 #ifdef CONFIG_IPV6_ROUTE_INFO
657 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
658 const struct in6_addr *gwaddr)
659 {
660 struct net *net = dev_net(dev);
661 struct route_info *rinfo = (struct route_info *) opt;
662 struct in6_addr prefix_buf, *prefix;
663 unsigned int pref;
664 unsigned long lifetime;
665 struct rt6_info *rt;
666
667 if (len < sizeof(struct route_info)) {
668 return -EINVAL;
669 }
670
671 /* Sanity check for prefix_len and length */
672 if (rinfo->length > 3) {
673 return -EINVAL;
674 } else if (rinfo->prefix_len > 128) {
675 return -EINVAL;
676 } else if (rinfo->prefix_len > 64) {
677 if (rinfo->length < 2) {
678 return -EINVAL;
679 }
680 } else if (rinfo->prefix_len > 0) {
681 if (rinfo->length < 1) {
682 return -EINVAL;
683 }
684 }
685
686 pref = rinfo->route_pref;
687 if (pref == ICMPV6_ROUTER_PREF_INVALID)
688 return -EINVAL;
689
690 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
691
692 if (rinfo->length == 3)
693 prefix = (struct in6_addr *)rinfo->prefix;
694 else {
695 /* this function is safe */
696 ipv6_addr_prefix(&prefix_buf,
697 (struct in6_addr *)rinfo->prefix,
698 rinfo->prefix_len);
699 prefix = &prefix_buf;
700 }
701
702 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
703 dev->ifindex);
704
705 if (rt && !lifetime) {
706 ip6_del_rt(rt);
707 rt = NULL;
708 }
709
710 if (!rt && lifetime)
711 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
712 pref);
713 else if (rt)
714 rt->rt6i_flags = RTF_ROUTEINFO |
715 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
716
717 if (rt) {
718 if (!addrconf_finite_timeout(lifetime))
719 rt6_clean_expires(rt);
720 else
721 rt6_set_expires(rt, jiffies + HZ * lifetime);
722
723 ip6_rt_put(rt);
724 }
725 return 0;
726 }
727 #endif
728
729 #define BACKTRACK(__net, saddr) \
730 do { \
731 if (rt == __net->ipv6.ip6_null_entry) { \
732 struct fib6_node *pn; \
733 while (1) { \
734 if (fn->fn_flags & RTN_TL_ROOT) \
735 goto out; \
736 pn = fn->parent; \
737 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
738 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
739 else \
740 fn = pn; \
741 if (fn->fn_flags & RTN_RTINFO) \
742 goto restart; \
743 } \
744 } \
745 } while (0)
746
747 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
748 struct fib6_table *table,
749 struct flowi6 *fl6, int flags)
750 {
751 struct fib6_node *fn;
752 struct rt6_info *rt;
753
754 read_lock_bh(&table->tb6_lock);
755 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
756 restart:
757 rt = fn->leaf;
758 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
759 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
760 rt = rt6_multipath_select(rt, fl6);
761 BACKTRACK(net, &fl6->saddr);
762 out:
763 dst_use(&rt->dst, jiffies);
764 read_unlock_bh(&table->tb6_lock);
765 return rt;
766
767 }
768
769 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
770 int flags)
771 {
772 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
773 }
774 EXPORT_SYMBOL_GPL(ip6_route_lookup);
775
776 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
777 const struct in6_addr *saddr, int oif, int strict)
778 {
779 struct flowi6 fl6 = {
780 .flowi6_oif = oif,
781 .daddr = *daddr,
782 };
783 struct dst_entry *dst;
784 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
785
786 if (saddr) {
787 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
788 flags |= RT6_LOOKUP_F_HAS_SADDR;
789 }
790
791 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
792 if (dst->error == 0)
793 return (struct rt6_info *) dst;
794
795 dst_release(dst);
796
797 return NULL;
798 }
799
800 EXPORT_SYMBOL(rt6_lookup);
801
802 /* ip6_ins_rt is called with FREE table->tb6_lock.
803 It takes new route entry, the addition fails by any reason the
804 route is freed. In any case, if caller does not hold it, it may
805 be destroyed.
806 */
807
808 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
809 {
810 int err;
811 struct fib6_table *table;
812
813 table = rt->rt6i_table;
814 write_lock_bh(&table->tb6_lock);
815 err = fib6_add(&table->tb6_root, rt, info);
816 write_unlock_bh(&table->tb6_lock);
817
818 return err;
819 }
820
821 int ip6_ins_rt(struct rt6_info *rt)
822 {
823 struct nl_info info = {
824 .nl_net = dev_net(rt->dst.dev),
825 };
826 return __ip6_ins_rt(rt, &info);
827 }
828
829 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
830 const struct in6_addr *daddr,
831 const struct in6_addr *saddr)
832 {
833 struct rt6_info *rt;
834
835 /*
836 * Clone the route.
837 */
838
839 rt = ip6_rt_copy(ort, daddr);
840
841 if (rt) {
842 int attempts = !in_softirq();
843
844 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
845 if (ort->rt6i_dst.plen != 128 &&
846 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
847 rt->rt6i_flags |= RTF_ANYCAST;
848 rt->rt6i_gateway = *daddr;
849 }
850
851 rt->rt6i_flags |= RTF_CACHE;
852
853 #ifdef CONFIG_IPV6_SUBTREES
854 if (rt->rt6i_src.plen && saddr) {
855 rt->rt6i_src.addr = *saddr;
856 rt->rt6i_src.plen = 128;
857 }
858 #endif
859
860 retry:
861 if (rt6_bind_neighbour(rt, rt->dst.dev)) {
862 struct net *net = dev_net(rt->dst.dev);
863 int saved_rt_min_interval =
864 net->ipv6.sysctl.ip6_rt_gc_min_interval;
865 int saved_rt_elasticity =
866 net->ipv6.sysctl.ip6_rt_gc_elasticity;
867
868 if (attempts-- > 0) {
869 net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
870 net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;
871
872 ip6_dst_gc(&net->ipv6.ip6_dst_ops);
873
874 net->ipv6.sysctl.ip6_rt_gc_elasticity =
875 saved_rt_elasticity;
876 net->ipv6.sysctl.ip6_rt_gc_min_interval =
877 saved_rt_min_interval;
878 goto retry;
879 }
880
881 net_warn_ratelimited("Neighbour table overflow\n");
882 dst_free(&rt->dst);
883 return NULL;
884 }
885 }
886
887 return rt;
888 }
889
890 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
891 const struct in6_addr *daddr)
892 {
893 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
894
895 if (rt) {
896 rt->rt6i_flags |= RTF_CACHE;
897 rt->n = neigh_clone(ort->n);
898 }
899 return rt;
900 }
901
902 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
903 struct flowi6 *fl6, int flags)
904 {
905 struct fib6_node *fn;
906 struct rt6_info *rt, *nrt;
907 int strict = 0;
908 int attempts = 3;
909 int err;
910 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
911
912 strict |= flags & RT6_LOOKUP_F_IFACE;
913
914 relookup:
915 read_lock_bh(&table->tb6_lock);
916
917 restart_2:
918 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
919
920 restart:
921 rt = rt6_select(fn, oif, strict | reachable);
922 if (rt->rt6i_nsiblings && oif == 0)
923 rt = rt6_multipath_select(rt, fl6);
924 BACKTRACK(net, &fl6->saddr);
925 if (rt == net->ipv6.ip6_null_entry ||
926 rt->rt6i_flags & RTF_CACHE)
927 goto out;
928
929 dst_hold(&rt->dst);
930 read_unlock_bh(&table->tb6_lock);
931
932 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
933 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
934 else if (!(rt->dst.flags & DST_HOST))
935 nrt = rt6_alloc_clone(rt, &fl6->daddr);
936 else
937 goto out2;
938
939 ip6_rt_put(rt);
940 rt = nrt ? : net->ipv6.ip6_null_entry;
941
942 dst_hold(&rt->dst);
943 if (nrt) {
944 err = ip6_ins_rt(nrt);
945 if (!err)
946 goto out2;
947 }
948
949 if (--attempts <= 0)
950 goto out2;
951
952 /*
953 * Race condition! In the gap, when table->tb6_lock was
954 * released someone could insert this route. Relookup.
955 */
956 ip6_rt_put(rt);
957 goto relookup;
958
959 out:
960 if (reachable) {
961 reachable = 0;
962 goto restart_2;
963 }
964 dst_hold(&rt->dst);
965 read_unlock_bh(&table->tb6_lock);
966 out2:
967 rt->dst.lastuse = jiffies;
968 rt->dst.__use++;
969
970 return rt;
971 }
972
973 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
974 struct flowi6 *fl6, int flags)
975 {
976 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
977 }
978
979 static struct dst_entry *ip6_route_input_lookup(struct net *net,
980 struct net_device *dev,
981 struct flowi6 *fl6, int flags)
982 {
983 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
984 flags |= RT6_LOOKUP_F_IFACE;
985
986 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
987 }
988
989 void ip6_route_input(struct sk_buff *skb)
990 {
991 const struct ipv6hdr *iph = ipv6_hdr(skb);
992 struct net *net = dev_net(skb->dev);
993 int flags = RT6_LOOKUP_F_HAS_SADDR;
994 struct flowi6 fl6 = {
995 .flowi6_iif = skb->dev->ifindex,
996 .daddr = iph->daddr,
997 .saddr = iph->saddr,
998 .flowlabel = ip6_flowinfo(iph),
999 .flowi6_mark = skb->mark,
1000 .flowi6_proto = iph->nexthdr,
1001 };
1002
1003 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1004 }
1005
1006 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1007 struct flowi6 *fl6, int flags)
1008 {
1009 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1010 }
1011
1012 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1013 struct flowi6 *fl6)
1014 {
1015 int flags = 0;
1016
1017 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1018
1019 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1020 flags |= RT6_LOOKUP_F_IFACE;
1021
1022 if (!ipv6_addr_any(&fl6->saddr))
1023 flags |= RT6_LOOKUP_F_HAS_SADDR;
1024 else if (sk)
1025 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1026
1027 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1028 }
1029
1030 EXPORT_SYMBOL(ip6_route_output);
1031
1032 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1033 {
1034 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1035 struct dst_entry *new = NULL;
1036
1037 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1038 if (rt) {
1039 new = &rt->dst;
1040
1041 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1042 rt6_init_peer(rt, net->ipv6.peers);
1043
1044 new->__use = 1;
1045 new->input = dst_discard;
1046 new->output = dst_discard;
1047
1048 if (dst_metrics_read_only(&ort->dst))
1049 new->_metrics = ort->dst._metrics;
1050 else
1051 dst_copy_metrics(new, &ort->dst);
1052 rt->rt6i_idev = ort->rt6i_idev;
1053 if (rt->rt6i_idev)
1054 in6_dev_hold(rt->rt6i_idev);
1055
1056 rt->rt6i_gateway = ort->rt6i_gateway;
1057 rt->rt6i_flags = ort->rt6i_flags;
1058 rt6_clean_expires(rt);
1059 rt->rt6i_metric = 0;
1060
1061 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1062 #ifdef CONFIG_IPV6_SUBTREES
1063 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1064 #endif
1065
1066 dst_free(new);
1067 }
1068
1069 dst_release(dst_orig);
1070 return new ? new : ERR_PTR(-ENOMEM);
1071 }
1072
1073 /*
1074 * Destination cache support functions
1075 */
1076
1077 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1078 {
1079 struct rt6_info *rt;
1080
1081 rt = (struct rt6_info *) dst;
1082
1083 /* All IPV6 dsts are created with ->obsolete set to the value
1084 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1085 * into this function always.
1086 */
1087 if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1088 return NULL;
1089
1090 if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
1091 return dst;
1092
1093 return NULL;
1094 }
1095
1096 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1097 {
1098 struct rt6_info *rt = (struct rt6_info *) dst;
1099
1100 if (rt) {
1101 if (rt->rt6i_flags & RTF_CACHE) {
1102 if (rt6_check_expired(rt)) {
1103 ip6_del_rt(rt);
1104 dst = NULL;
1105 }
1106 } else {
1107 dst_release(dst);
1108 dst = NULL;
1109 }
1110 }
1111 return dst;
1112 }
1113
1114 static void ip6_link_failure(struct sk_buff *skb)
1115 {
1116 struct rt6_info *rt;
1117
1118 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1119
1120 rt = (struct rt6_info *) skb_dst(skb);
1121 if (rt) {
1122 if (rt->rt6i_flags & RTF_CACHE)
1123 rt6_update_expires(rt, 0);
1124 else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
1125 rt->rt6i_node->fn_sernum = -1;
1126 }
1127 }
1128
1129 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1130 struct sk_buff *skb, u32 mtu)
1131 {
1132 struct rt6_info *rt6 = (struct rt6_info*)dst;
1133
1134 dst_confirm(dst);
1135 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1136 struct net *net = dev_net(dst->dev);
1137
1138 rt6->rt6i_flags |= RTF_MODIFIED;
1139 if (mtu < IPV6_MIN_MTU) {
1140 u32 features = dst_metric(dst, RTAX_FEATURES);
1141 mtu = IPV6_MIN_MTU;
1142 features |= RTAX_FEATURE_ALLFRAG;
1143 dst_metric_set(dst, RTAX_FEATURES, features);
1144 }
1145 dst_metric_set(dst, RTAX_MTU, mtu);
1146 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1147 }
1148 }
1149
1150 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1151 int oif, u32 mark)
1152 {
1153 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1154 struct dst_entry *dst;
1155 struct flowi6 fl6;
1156
1157 memset(&fl6, 0, sizeof(fl6));
1158 fl6.flowi6_oif = oif;
1159 fl6.flowi6_mark = mark;
1160 fl6.flowi6_flags = 0;
1161 fl6.daddr = iph->daddr;
1162 fl6.saddr = iph->saddr;
1163 fl6.flowlabel = ip6_flowinfo(iph);
1164
1165 dst = ip6_route_output(net, NULL, &fl6);
1166 if (!dst->error)
1167 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1168 dst_release(dst);
1169 }
1170 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1171
1172 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1173 {
1174 ip6_update_pmtu(skb, sock_net(sk), mtu,
1175 sk->sk_bound_dev_if, sk->sk_mark);
1176 }
1177 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1178
1179 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1180 {
1181 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1182 struct dst_entry *dst;
1183 struct flowi6 fl6;
1184
1185 memset(&fl6, 0, sizeof(fl6));
1186 fl6.flowi6_oif = oif;
1187 fl6.flowi6_mark = mark;
1188 fl6.flowi6_flags = 0;
1189 fl6.daddr = iph->daddr;
1190 fl6.saddr = iph->saddr;
1191 fl6.flowlabel = ip6_flowinfo(iph);
1192
1193 dst = ip6_route_output(net, NULL, &fl6);
1194 if (!dst->error)
1195 rt6_do_redirect(dst, NULL, skb);
1196 dst_release(dst);
1197 }
1198 EXPORT_SYMBOL_GPL(ip6_redirect);
1199
1200 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1201 {
1202 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1203 }
1204 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1205
1206 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1207 {
1208 struct net_device *dev = dst->dev;
1209 unsigned int mtu = dst_mtu(dst);
1210 struct net *net = dev_net(dev);
1211
1212 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1213
1214 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1215 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1216
1217 /*
1218 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1219 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1220 * IPV6_MAXPLEN is also valid and means: "any MSS,
1221 * rely only on pmtu discovery"
1222 */
1223 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1224 mtu = IPV6_MAXPLEN;
1225 return mtu;
1226 }
1227
1228 static unsigned int ip6_mtu(const struct dst_entry *dst)
1229 {
1230 struct inet6_dev *idev;
1231 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1232
1233 if (mtu)
1234 return mtu;
1235
1236 mtu = IPV6_MIN_MTU;
1237
1238 rcu_read_lock();
1239 idev = __in6_dev_get(dst->dev);
1240 if (idev)
1241 mtu = idev->cnf.mtu6;
1242 rcu_read_unlock();
1243
1244 return mtu;
1245 }
1246
1247 static struct dst_entry *icmp6_dst_gc_list;
1248 static DEFINE_SPINLOCK(icmp6_dst_lock);
1249
1250 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1251 struct neighbour *neigh,
1252 struct flowi6 *fl6)
1253 {
1254 struct dst_entry *dst;
1255 struct rt6_info *rt;
1256 struct inet6_dev *idev = in6_dev_get(dev);
1257 struct net *net = dev_net(dev);
1258
1259 if (unlikely(!idev))
1260 return ERR_PTR(-ENODEV);
1261
1262 rt = ip6_dst_alloc(net, dev, 0, NULL);
1263 if (unlikely(!rt)) {
1264 in6_dev_put(idev);
1265 dst = ERR_PTR(-ENOMEM);
1266 goto out;
1267 }
1268
1269 if (neigh)
1270 neigh_hold(neigh);
1271 else {
1272 neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr);
1273 if (IS_ERR(neigh)) {
1274 in6_dev_put(idev);
1275 dst_free(&rt->dst);
1276 return ERR_CAST(neigh);
1277 }
1278 }
1279
1280 rt->dst.flags |= DST_HOST;
1281 rt->dst.output = ip6_output;
1282 rt->n = neigh;
1283 atomic_set(&rt->dst.__refcnt, 1);
1284 rt->rt6i_dst.addr = fl6->daddr;
1285 rt->rt6i_dst.plen = 128;
1286 rt->rt6i_idev = idev;
1287 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1288
1289 spin_lock_bh(&icmp6_dst_lock);
1290 rt->dst.next = icmp6_dst_gc_list;
1291 icmp6_dst_gc_list = &rt->dst;
1292 spin_unlock_bh(&icmp6_dst_lock);
1293
1294 fib6_force_start_gc(net);
1295
1296 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1297
1298 out:
1299 return dst;
1300 }
1301
1302 int icmp6_dst_gc(void)
1303 {
1304 struct dst_entry *dst, **pprev;
1305 int more = 0;
1306
1307 spin_lock_bh(&icmp6_dst_lock);
1308 pprev = &icmp6_dst_gc_list;
1309
1310 while ((dst = *pprev) != NULL) {
1311 if (!atomic_read(&dst->__refcnt)) {
1312 *pprev = dst->next;
1313 dst_free(dst);
1314 } else {
1315 pprev = &dst->next;
1316 ++more;
1317 }
1318 }
1319
1320 spin_unlock_bh(&icmp6_dst_lock);
1321
1322 return more;
1323 }
1324
1325 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1326 void *arg)
1327 {
1328 struct dst_entry *dst, **pprev;
1329
1330 spin_lock_bh(&icmp6_dst_lock);
1331 pprev = &icmp6_dst_gc_list;
1332 while ((dst = *pprev) != NULL) {
1333 struct rt6_info *rt = (struct rt6_info *) dst;
1334 if (func(rt, arg)) {
1335 *pprev = dst->next;
1336 dst_free(dst);
1337 } else {
1338 pprev = &dst->next;
1339 }
1340 }
1341 spin_unlock_bh(&icmp6_dst_lock);
1342 }
1343
1344 static int ip6_dst_gc(struct dst_ops *ops)
1345 {
1346 unsigned long now = jiffies;
1347 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1348 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1349 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1350 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1351 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1352 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1353 int entries;
1354
1355 entries = dst_entries_get_fast(ops);
1356 if (time_after(rt_last_gc + rt_min_interval, now) &&
1357 entries <= rt_max_size)
1358 goto out;
1359
1360 net->ipv6.ip6_rt_gc_expire++;
1361 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1362 net->ipv6.ip6_rt_last_gc = now;
1363 entries = dst_entries_get_slow(ops);
1364 if (entries < ops->gc_thresh)
1365 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1366 out:
1367 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1368 return entries > rt_max_size;
1369 }
1370
1371 int ip6_dst_hoplimit(struct dst_entry *dst)
1372 {
1373 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1374 if (hoplimit == 0) {
1375 struct net_device *dev = dst->dev;
1376 struct inet6_dev *idev;
1377
1378 rcu_read_lock();
1379 idev = __in6_dev_get(dev);
1380 if (idev)
1381 hoplimit = idev->cnf.hop_limit;
1382 else
1383 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1384 rcu_read_unlock();
1385 }
1386 return hoplimit;
1387 }
1388 EXPORT_SYMBOL(ip6_dst_hoplimit);
1389
1390 /*
1391 *
1392 */
1393
1394 int ip6_route_add(struct fib6_config *cfg)
1395 {
1396 int err;
1397 struct net *net = cfg->fc_nlinfo.nl_net;
1398 struct rt6_info *rt = NULL;
1399 struct net_device *dev = NULL;
1400 struct inet6_dev *idev = NULL;
1401 struct fib6_table *table;
1402 int addr_type;
1403
1404 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1405 return -EINVAL;
1406 #ifndef CONFIG_IPV6_SUBTREES
1407 if (cfg->fc_src_len)
1408 return -EINVAL;
1409 #endif
1410 if (cfg->fc_ifindex) {
1411 err = -ENODEV;
1412 dev = dev_get_by_index(net, cfg->fc_ifindex);
1413 if (!dev)
1414 goto out;
1415 idev = in6_dev_get(dev);
1416 if (!idev)
1417 goto out;
1418 }
1419
1420 if (cfg->fc_metric == 0)
1421 cfg->fc_metric = IP6_RT_PRIO_USER;
1422
1423 err = -ENOBUFS;
1424 if (cfg->fc_nlinfo.nlh &&
1425 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1426 table = fib6_get_table(net, cfg->fc_table);
1427 if (!table) {
1428 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1429 table = fib6_new_table(net, cfg->fc_table);
1430 }
1431 } else {
1432 table = fib6_new_table(net, cfg->fc_table);
1433 }
1434
1435 if (!table)
1436 goto out;
1437
1438 rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);
1439
1440 if (!rt) {
1441 err = -ENOMEM;
1442 goto out;
1443 }
1444
1445 if (cfg->fc_flags & RTF_EXPIRES)
1446 rt6_set_expires(rt, jiffies +
1447 clock_t_to_jiffies(cfg->fc_expires));
1448 else
1449 rt6_clean_expires(rt);
1450
1451 if (cfg->fc_protocol == RTPROT_UNSPEC)
1452 cfg->fc_protocol = RTPROT_BOOT;
1453 rt->rt6i_protocol = cfg->fc_protocol;
1454
1455 addr_type = ipv6_addr_type(&cfg->fc_dst);
1456
1457 if (addr_type & IPV6_ADDR_MULTICAST)
1458 rt->dst.input = ip6_mc_input;
1459 else if (cfg->fc_flags & RTF_LOCAL)
1460 rt->dst.input = ip6_input;
1461 else
1462 rt->dst.input = ip6_forward;
1463
1464 rt->dst.output = ip6_output;
1465
1466 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1467 rt->rt6i_dst.plen = cfg->fc_dst_len;
1468 if (rt->rt6i_dst.plen == 128)
1469 rt->dst.flags |= DST_HOST;
1470
1471 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1472 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1473 if (!metrics) {
1474 err = -ENOMEM;
1475 goto out;
1476 }
1477 dst_init_metrics(&rt->dst, metrics, 0);
1478 }
1479 #ifdef CONFIG_IPV6_SUBTREES
1480 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1481 rt->rt6i_src.plen = cfg->fc_src_len;
1482 #endif
1483
1484 rt->rt6i_metric = cfg->fc_metric;
1485
1486 /* We cannot add true routes via loopback here,
1487 they would result in kernel looping; promote them to reject routes
1488 */
1489 if ((cfg->fc_flags & RTF_REJECT) ||
1490 (dev && (dev->flags & IFF_LOOPBACK) &&
1491 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1492 !(cfg->fc_flags & RTF_LOCAL))) {
1493 /* hold loopback dev/idev if we haven't done so. */
1494 if (dev != net->loopback_dev) {
1495 if (dev) {
1496 dev_put(dev);
1497 in6_dev_put(idev);
1498 }
1499 dev = net->loopback_dev;
1500 dev_hold(dev);
1501 idev = in6_dev_get(dev);
1502 if (!idev) {
1503 err = -ENODEV;
1504 goto out;
1505 }
1506 }
1507 rt->dst.output = ip6_pkt_discard_out;
1508 rt->dst.input = ip6_pkt_discard;
1509 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1510 switch (cfg->fc_type) {
1511 case RTN_BLACKHOLE:
1512 rt->dst.error = -EINVAL;
1513 break;
1514 case RTN_PROHIBIT:
1515 rt->dst.error = -EACCES;
1516 break;
1517 case RTN_THROW:
1518 rt->dst.error = -EAGAIN;
1519 break;
1520 default:
1521 rt->dst.error = -ENETUNREACH;
1522 break;
1523 }
1524 goto install_route;
1525 }
1526
1527 if (cfg->fc_flags & RTF_GATEWAY) {
1528 const struct in6_addr *gw_addr;
1529 int gwa_type;
1530
1531 gw_addr = &cfg->fc_gateway;
1532 rt->rt6i_gateway = *gw_addr;
1533 gwa_type = ipv6_addr_type(gw_addr);
1534
1535 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1536 struct rt6_info *grt;
1537
1538 /* IPv6 strictly inhibits using not link-local
1539 addresses as nexthop address.
1540 Otherwise, router will not able to send redirects.
1541 It is very good, but in some (rare!) circumstances
1542 (SIT, PtP, NBMA NOARP links) it is handy to allow
1543 some exceptions. --ANK
1544 */
1545 err = -EINVAL;
1546 if (!(gwa_type & IPV6_ADDR_UNICAST))
1547 goto out;
1548
1549 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1550
1551 err = -EHOSTUNREACH;
1552 if (!grt)
1553 goto out;
1554 if (dev) {
1555 if (dev != grt->dst.dev) {
1556 ip6_rt_put(grt);
1557 goto out;
1558 }
1559 } else {
1560 dev = grt->dst.dev;
1561 idev = grt->rt6i_idev;
1562 dev_hold(dev);
1563 in6_dev_hold(grt->rt6i_idev);
1564 }
1565 if (!(grt->rt6i_flags & RTF_GATEWAY))
1566 err = 0;
1567 ip6_rt_put(grt);
1568
1569 if (err)
1570 goto out;
1571 }
1572 err = -EINVAL;
1573 if (!dev || (dev->flags & IFF_LOOPBACK))
1574 goto out;
1575 }
1576
1577 err = -ENODEV;
1578 if (!dev)
1579 goto out;
1580
1581 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1582 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1583 err = -EINVAL;
1584 goto out;
1585 }
1586 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1587 rt->rt6i_prefsrc.plen = 128;
1588 } else
1589 rt->rt6i_prefsrc.plen = 0;
1590
1591 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1592 err = rt6_bind_neighbour(rt, dev);
1593 if (err)
1594 goto out;
1595 }
1596
1597 rt->rt6i_flags = cfg->fc_flags;
1598
1599 install_route:
1600 if (cfg->fc_mx) {
1601 struct nlattr *nla;
1602 int remaining;
1603
1604 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1605 int type = nla_type(nla);
1606
1607 if (type) {
1608 if (type > RTAX_MAX) {
1609 err = -EINVAL;
1610 goto out;
1611 }
1612
1613 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1614 }
1615 }
1616 }
1617
1618 rt->dst.dev = dev;
1619 rt->rt6i_idev = idev;
1620 rt->rt6i_table = table;
1621
1622 cfg->fc_nlinfo.nl_net = dev_net(dev);
1623
1624 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1625
1626 out:
1627 if (dev)
1628 dev_put(dev);
1629 if (idev)
1630 in6_dev_put(idev);
1631 if (rt)
1632 dst_free(&rt->dst);
1633 return err;
1634 }
1635
1636 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1637 {
1638 int err;
1639 struct fib6_table *table;
1640 struct net *net = dev_net(rt->dst.dev);
1641
1642 if (rt == net->ipv6.ip6_null_entry) {
1643 err = -ENOENT;
1644 goto out;
1645 }
1646
1647 table = rt->rt6i_table;
1648 write_lock_bh(&table->tb6_lock);
1649 err = fib6_del(rt, info);
1650 write_unlock_bh(&table->tb6_lock);
1651
1652 out:
1653 ip6_rt_put(rt);
1654 return err;
1655 }
1656
1657 int ip6_del_rt(struct rt6_info *rt)
1658 {
1659 struct nl_info info = {
1660 .nl_net = dev_net(rt->dst.dev),
1661 };
1662 return __ip6_del_rt(rt, &info);
1663 }
1664
1665 static int ip6_route_del(struct fib6_config *cfg)
1666 {
1667 struct fib6_table *table;
1668 struct fib6_node *fn;
1669 struct rt6_info *rt;
1670 int err = -ESRCH;
1671
1672 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1673 if (!table)
1674 return err;
1675
1676 read_lock_bh(&table->tb6_lock);
1677
1678 fn = fib6_locate(&table->tb6_root,
1679 &cfg->fc_dst, cfg->fc_dst_len,
1680 &cfg->fc_src, cfg->fc_src_len);
1681
1682 if (fn) {
1683 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1684 if (cfg->fc_ifindex &&
1685 (!rt->dst.dev ||
1686 rt->dst.dev->ifindex != cfg->fc_ifindex))
1687 continue;
1688 if (cfg->fc_flags & RTF_GATEWAY &&
1689 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1690 continue;
1691 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1692 continue;
1693 dst_hold(&rt->dst);
1694 read_unlock_bh(&table->tb6_lock);
1695
1696 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1697 }
1698 }
1699 read_unlock_bh(&table->tb6_lock);
1700
1701 return err;
1702 }
1703
1704 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1705 {
1706 struct net *net = dev_net(skb->dev);
1707 struct netevent_redirect netevent;
1708 struct rt6_info *rt, *nrt = NULL;
1709 struct ndisc_options ndopts;
1710 struct neighbour *old_neigh;
1711 struct inet6_dev *in6_dev;
1712 struct neighbour *neigh;
1713 struct rd_msg *msg;
1714 int optlen, on_link;
1715 u8 *lladdr;
1716
1717 optlen = skb->tail - skb->transport_header;
1718 optlen -= sizeof(*msg);
1719
1720 if (optlen < 0) {
1721 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1722 return;
1723 }
1724
1725 msg = (struct rd_msg *)icmp6_hdr(skb);
1726
1727 if (ipv6_addr_is_multicast(&msg->dest)) {
1728 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1729 return;
1730 }
1731
1732 on_link = 0;
1733 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1734 on_link = 1;
1735 } else if (ipv6_addr_type(&msg->target) !=
1736 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1737 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1738 return;
1739 }
1740
1741 in6_dev = __in6_dev_get(skb->dev);
1742 if (!in6_dev)
1743 return;
1744 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1745 return;
1746
1747 /* RFC2461 8.1:
1748 * The IP source address of the Redirect MUST be the same as the current
1749 * first-hop router for the specified ICMP Destination Address.
1750 */
1751
1752 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1753 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1754 return;
1755 }
1756
1757 lladdr = NULL;
1758 if (ndopts.nd_opts_tgt_lladdr) {
1759 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1760 skb->dev);
1761 if (!lladdr) {
1762 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1763 return;
1764 }
1765 }
1766
1767 rt = (struct rt6_info *) dst;
1768 if (rt == net->ipv6.ip6_null_entry) {
1769 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1770 return;
1771 }
1772
1773 /* Redirect received -> path was valid.
1774 * Look, redirects are sent only in response to data packets,
1775 * so that this nexthop apparently is reachable. --ANK
1776 */
1777 dst_confirm(&rt->dst);
1778
1779 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1780 if (!neigh)
1781 return;
1782
1783 /* Duplicate redirect: silently ignore. */
1784 old_neigh = rt->n;
1785 if (neigh == old_neigh)
1786 goto out;
1787
1788 /*
1789 * We have finally decided to accept it.
1790 */
1791
1792 neigh_update(neigh, lladdr, NUD_STALE,
1793 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1794 NEIGH_UPDATE_F_OVERRIDE|
1795 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1796 NEIGH_UPDATE_F_ISROUTER))
1797 );
1798
1799 nrt = ip6_rt_copy(rt, &msg->dest);
1800 if (!nrt)
1801 goto out;
1802
1803 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1804 if (on_link)
1805 nrt->rt6i_flags &= ~RTF_GATEWAY;
1806
1807 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1808 nrt->n = neigh_clone(neigh);
1809
1810 if (ip6_ins_rt(nrt))
1811 goto out;
1812
1813 netevent.old = &rt->dst;
1814 netevent.new = &nrt->dst;
1815 netevent.daddr = &msg->dest;
1816 netevent.neigh = neigh;
1817 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1818
1819 if (rt->rt6i_flags & RTF_CACHE) {
1820 rt = (struct rt6_info *) dst_clone(&rt->dst);
1821 ip6_del_rt(rt);
1822 }
1823
1824 out:
1825 neigh_release(neigh);
1826 }
1827
1828 /*
1829 * Misc support functions
1830 */
1831
1832 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1833 const struct in6_addr *dest)
1834 {
1835 struct net *net = dev_net(ort->dst.dev);
1836 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1837 ort->rt6i_table);
1838
1839 if (rt) {
1840 rt->dst.input = ort->dst.input;
1841 rt->dst.output = ort->dst.output;
1842 rt->dst.flags |= DST_HOST;
1843
1844 rt->rt6i_dst.addr = *dest;
1845 rt->rt6i_dst.plen = 128;
1846 dst_copy_metrics(&rt->dst, &ort->dst);
1847 rt->dst.error = ort->dst.error;
1848 rt->rt6i_idev = ort->rt6i_idev;
1849 if (rt->rt6i_idev)
1850 in6_dev_hold(rt->rt6i_idev);
1851 rt->dst.lastuse = jiffies;
1852
1853 rt->rt6i_gateway = ort->rt6i_gateway;
1854 rt->rt6i_flags = ort->rt6i_flags;
1855 if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
1856 (RTF_DEFAULT | RTF_ADDRCONF))
1857 rt6_set_from(rt, ort);
1858 else
1859 rt6_clean_expires(rt);
1860 rt->rt6i_metric = 0;
1861
1862 #ifdef CONFIG_IPV6_SUBTREES
1863 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1864 #endif
1865 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1866 rt->rt6i_table = ort->rt6i_table;
1867 }
1868 return rt;
1869 }
1870
1871 #ifdef CONFIG_IPV6_ROUTE_INFO
1872 static struct rt6_info *rt6_get_route_info(struct net *net,
1873 const struct in6_addr *prefix, int prefixlen,
1874 const struct in6_addr *gwaddr, int ifindex)
1875 {
1876 struct fib6_node *fn;
1877 struct rt6_info *rt = NULL;
1878 struct fib6_table *table;
1879
1880 table = fib6_get_table(net, RT6_TABLE_INFO);
1881 if (!table)
1882 return NULL;
1883
1884 read_lock_bh(&table->tb6_lock);
1885 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1886 if (!fn)
1887 goto out;
1888
1889 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1890 if (rt->dst.dev->ifindex != ifindex)
1891 continue;
1892 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1893 continue;
1894 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1895 continue;
1896 dst_hold(&rt->dst);
1897 break;
1898 }
1899 out:
1900 read_unlock_bh(&table->tb6_lock);
1901 return rt;
1902 }
1903
1904 static struct rt6_info *rt6_add_route_info(struct net *net,
1905 const struct in6_addr *prefix, int prefixlen,
1906 const struct in6_addr *gwaddr, int ifindex,
1907 unsigned int pref)
1908 {
1909 struct fib6_config cfg = {
1910 .fc_table = RT6_TABLE_INFO,
1911 .fc_metric = IP6_RT_PRIO_USER,
1912 .fc_ifindex = ifindex,
1913 .fc_dst_len = prefixlen,
1914 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1915 RTF_UP | RTF_PREF(pref),
1916 .fc_nlinfo.portid = 0,
1917 .fc_nlinfo.nlh = NULL,
1918 .fc_nlinfo.nl_net = net,
1919 };
1920
1921 cfg.fc_dst = *prefix;
1922 cfg.fc_gateway = *gwaddr;
1923
1924 /* We should treat it as a default route if prefix length is 0. */
1925 if (!prefixlen)
1926 cfg.fc_flags |= RTF_DEFAULT;
1927
1928 ip6_route_add(&cfg);
1929
1930 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1931 }
1932 #endif
1933
1934 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1935 {
1936 struct rt6_info *rt;
1937 struct fib6_table *table;
1938
1939 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1940 if (!table)
1941 return NULL;
1942
1943 read_lock_bh(&table->tb6_lock);
1944 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1945 if (dev == rt->dst.dev &&
1946 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1947 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1948 break;
1949 }
1950 if (rt)
1951 dst_hold(&rt->dst);
1952 read_unlock_bh(&table->tb6_lock);
1953 return rt;
1954 }
1955
1956 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1957 struct net_device *dev,
1958 unsigned int pref)
1959 {
1960 struct fib6_config cfg = {
1961 .fc_table = RT6_TABLE_DFLT,
1962 .fc_metric = IP6_RT_PRIO_USER,
1963 .fc_ifindex = dev->ifindex,
1964 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1965 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1966 .fc_nlinfo.portid = 0,
1967 .fc_nlinfo.nlh = NULL,
1968 .fc_nlinfo.nl_net = dev_net(dev),
1969 };
1970
1971 cfg.fc_gateway = *gwaddr;
1972
1973 ip6_route_add(&cfg);
1974
1975 return rt6_get_dflt_router(gwaddr, dev);
1976 }
1977
1978 void rt6_purge_dflt_routers(struct net *net)
1979 {
1980 struct rt6_info *rt;
1981 struct fib6_table *table;
1982
1983 /* NOTE: Keep consistent with rt6_get_dflt_router */
1984 table = fib6_get_table(net, RT6_TABLE_DFLT);
1985 if (!table)
1986 return;
1987
1988 restart:
1989 read_lock_bh(&table->tb6_lock);
1990 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1991 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1992 dst_hold(&rt->dst);
1993 read_unlock_bh(&table->tb6_lock);
1994 ip6_del_rt(rt);
1995 goto restart;
1996 }
1997 }
1998 read_unlock_bh(&table->tb6_lock);
1999 }
2000
2001 static void rtmsg_to_fib6_config(struct net *net,
2002 struct in6_rtmsg *rtmsg,
2003 struct fib6_config *cfg)
2004 {
2005 memset(cfg, 0, sizeof(*cfg));
2006
2007 cfg->fc_table = RT6_TABLE_MAIN;
2008 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2009 cfg->fc_metric = rtmsg->rtmsg_metric;
2010 cfg->fc_expires = rtmsg->rtmsg_info;
2011 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2012 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2013 cfg->fc_flags = rtmsg->rtmsg_flags;
2014
2015 cfg->fc_nlinfo.nl_net = net;
2016
2017 cfg->fc_dst = rtmsg->rtmsg_dst;
2018 cfg->fc_src = rtmsg->rtmsg_src;
2019 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2020 }
2021
2022 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2023 {
2024 struct fib6_config cfg;
2025 struct in6_rtmsg rtmsg;
2026 int err;
2027
2028 switch(cmd) {
2029 case SIOCADDRT: /* Add a route */
2030 case SIOCDELRT: /* Delete a route */
2031 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2032 return -EPERM;
2033 err = copy_from_user(&rtmsg, arg,
2034 sizeof(struct in6_rtmsg));
2035 if (err)
2036 return -EFAULT;
2037
2038 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2039
2040 rtnl_lock();
2041 switch (cmd) {
2042 case SIOCADDRT:
2043 err = ip6_route_add(&cfg);
2044 break;
2045 case SIOCDELRT:
2046 err = ip6_route_del(&cfg);
2047 break;
2048 default:
2049 err = -EINVAL;
2050 }
2051 rtnl_unlock();
2052
2053 return err;
2054 }
2055
2056 return -EINVAL;
2057 }
2058
2059 /*
2060 * Drop the packet on the floor
2061 */
2062
2063 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2064 {
2065 int type;
2066 struct dst_entry *dst = skb_dst(skb);
2067 switch (ipstats_mib_noroutes) {
2068 case IPSTATS_MIB_INNOROUTES:
2069 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2070 if (type == IPV6_ADDR_ANY) {
2071 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2072 IPSTATS_MIB_INADDRERRORS);
2073 break;
2074 }
2075 /* FALLTHROUGH */
2076 case IPSTATS_MIB_OUTNOROUTES:
2077 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2078 ipstats_mib_noroutes);
2079 break;
2080 }
2081 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2082 kfree_skb(skb);
2083 return 0;
2084 }
2085
2086 static int ip6_pkt_discard(struct sk_buff *skb)
2087 {
2088 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2089 }
2090
2091 static int ip6_pkt_discard_out(struct sk_buff *skb)
2092 {
2093 skb->dev = skb_dst(skb)->dev;
2094 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2095 }
2096
2097 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2098
2099 static int ip6_pkt_prohibit(struct sk_buff *skb)
2100 {
2101 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2102 }
2103
2104 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2105 {
2106 skb->dev = skb_dst(skb)->dev;
2107 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2108 }
2109
2110 #endif
2111
2112 /*
2113 * Allocate a dst for local (unicast / anycast) address.
2114 */
2115
2116 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2117 const struct in6_addr *addr,
2118 bool anycast)
2119 {
2120 struct net *net = dev_net(idev->dev);
2121 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL);
2122 int err;
2123
2124 if (!rt) {
2125 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
2126 return ERR_PTR(-ENOMEM);
2127 }
2128
2129 in6_dev_hold(idev);
2130
2131 rt->dst.flags |= DST_HOST;
2132 rt->dst.input = ip6_input;
2133 rt->dst.output = ip6_output;
2134 rt->rt6i_idev = idev;
2135
2136 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2137 if (anycast)
2138 rt->rt6i_flags |= RTF_ANYCAST;
2139 else
2140 rt->rt6i_flags |= RTF_LOCAL;
2141 err = rt6_bind_neighbour(rt, rt->dst.dev);
2142 if (err) {
2143 dst_free(&rt->dst);
2144 return ERR_PTR(err);
2145 }
2146
2147 rt->rt6i_dst.addr = *addr;
2148 rt->rt6i_dst.plen = 128;
2149 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2150
2151 atomic_set(&rt->dst.__refcnt, 1);
2152
2153 return rt;
2154 }
2155
2156 int ip6_route_get_saddr(struct net *net,
2157 struct rt6_info *rt,
2158 const struct in6_addr *daddr,
2159 unsigned int prefs,
2160 struct in6_addr *saddr)
2161 {
2162 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2163 int err = 0;
2164 if (rt->rt6i_prefsrc.plen)
2165 *saddr = rt->rt6i_prefsrc.addr;
2166 else
2167 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2168 daddr, prefs, saddr);
2169 return err;
2170 }
2171
2172 /* remove deleted ip from prefsrc entries */
2173 struct arg_dev_net_ip {
2174 struct net_device *dev;
2175 struct net *net;
2176 struct in6_addr *addr;
2177 };
2178
2179 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2180 {
2181 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2182 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2183 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2184
2185 if (((void *)rt->dst.dev == dev || !dev) &&
2186 rt != net->ipv6.ip6_null_entry &&
2187 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2188 /* remove prefsrc entry */
2189 rt->rt6i_prefsrc.plen = 0;
2190 }
2191 return 0;
2192 }
2193
2194 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2195 {
2196 struct net *net = dev_net(ifp->idev->dev);
2197 struct arg_dev_net_ip adni = {
2198 .dev = ifp->idev->dev,
2199 .net = net,
2200 .addr = &ifp->addr,
2201 };
2202 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2203 }
2204
2205 struct arg_dev_net {
2206 struct net_device *dev;
2207 struct net *net;
2208 };
2209
2210 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2211 {
2212 const struct arg_dev_net *adn = arg;
2213 const struct net_device *dev = adn->dev;
2214
2215 if ((rt->dst.dev == dev || !dev) &&
2216 rt != adn->net->ipv6.ip6_null_entry)
2217 return -1;
2218
2219 return 0;
2220 }
2221
2222 void rt6_ifdown(struct net *net, struct net_device *dev)
2223 {
2224 struct arg_dev_net adn = {
2225 .dev = dev,
2226 .net = net,
2227 };
2228
2229 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2230 icmp6_clean_all(fib6_ifdown, &adn);
2231 }
2232
2233 struct rt6_mtu_change_arg {
2234 struct net_device *dev;
2235 unsigned int mtu;
2236 };
2237
2238 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2239 {
2240 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2241 struct inet6_dev *idev;
2242
2243 /* In IPv6 pmtu discovery is not optional,
2244 so that RTAX_MTU lock cannot disable it.
2245 We still use this lock to block changes
2246 caused by addrconf/ndisc.
2247 */
2248
2249 idev = __in6_dev_get(arg->dev);
2250 if (!idev)
2251 return 0;
2252
2253 /* For administrative MTU increase, there is no way to discover
2254 IPv6 PMTU increase, so PMTU increase should be updated here.
2255 Since RFC 1981 doesn't include administrative MTU increase
2256 update PMTU increase is a MUST. (i.e. jumbo frame)
2257 */
2258 /*
2259 If new MTU is less than route PMTU, this new MTU will be the
2260 lowest MTU in the path, update the route PMTU to reflect PMTU
2261 decreases; if new MTU is greater than route PMTU, and the
2262 old MTU is the lowest MTU in the path, update the route PMTU
2263 to reflect the increase. In this case if the other nodes' MTU
2264 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2265 PMTU discouvery.
2266 */
2267 if (rt->dst.dev == arg->dev &&
2268 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2269 (dst_mtu(&rt->dst) >= arg->mtu ||
2270 (dst_mtu(&rt->dst) < arg->mtu &&
2271 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2272 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2273 }
2274 return 0;
2275 }
2276
2277 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2278 {
2279 struct rt6_mtu_change_arg arg = {
2280 .dev = dev,
2281 .mtu = mtu,
2282 };
2283
2284 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2285 }
2286
2287 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2288 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2289 [RTA_OIF] = { .type = NLA_U32 },
2290 [RTA_IIF] = { .type = NLA_U32 },
2291 [RTA_PRIORITY] = { .type = NLA_U32 },
2292 [RTA_METRICS] = { .type = NLA_NESTED },
2293 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2294 };
2295
2296 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2297 struct fib6_config *cfg)
2298 {
2299 struct rtmsg *rtm;
2300 struct nlattr *tb[RTA_MAX+1];
2301 int err;
2302
2303 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2304 if (err < 0)
2305 goto errout;
2306
2307 err = -EINVAL;
2308 rtm = nlmsg_data(nlh);
2309 memset(cfg, 0, sizeof(*cfg));
2310
2311 cfg->fc_table = rtm->rtm_table;
2312 cfg->fc_dst_len = rtm->rtm_dst_len;
2313 cfg->fc_src_len = rtm->rtm_src_len;
2314 cfg->fc_flags = RTF_UP;
2315 cfg->fc_protocol = rtm->rtm_protocol;
2316 cfg->fc_type = rtm->rtm_type;
2317
2318 if (rtm->rtm_type == RTN_UNREACHABLE ||
2319 rtm->rtm_type == RTN_BLACKHOLE ||
2320 rtm->rtm_type == RTN_PROHIBIT ||
2321 rtm->rtm_type == RTN_THROW)
2322 cfg->fc_flags |= RTF_REJECT;
2323
2324 if (rtm->rtm_type == RTN_LOCAL)
2325 cfg->fc_flags |= RTF_LOCAL;
2326
2327 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2328 cfg->fc_nlinfo.nlh = nlh;
2329 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2330
2331 if (tb[RTA_GATEWAY]) {
2332 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2333 cfg->fc_flags |= RTF_GATEWAY;
2334 }
2335
2336 if (tb[RTA_DST]) {
2337 int plen = (rtm->rtm_dst_len + 7) >> 3;
2338
2339 if (nla_len(tb[RTA_DST]) < plen)
2340 goto errout;
2341
2342 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2343 }
2344
2345 if (tb[RTA_SRC]) {
2346 int plen = (rtm->rtm_src_len + 7) >> 3;
2347
2348 if (nla_len(tb[RTA_SRC]) < plen)
2349 goto errout;
2350
2351 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2352 }
2353
2354 if (tb[RTA_PREFSRC])
2355 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2356
2357 if (tb[RTA_OIF])
2358 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2359
2360 if (tb[RTA_PRIORITY])
2361 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2362
2363 if (tb[RTA_METRICS]) {
2364 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2365 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2366 }
2367
2368 if (tb[RTA_TABLE])
2369 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2370
2371 if (tb[RTA_MULTIPATH]) {
2372 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2373 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2374 }
2375
2376 err = 0;
2377 errout:
2378 return err;
2379 }
2380
2381 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2382 {
2383 struct fib6_config r_cfg;
2384 struct rtnexthop *rtnh;
2385 int remaining;
2386 int attrlen;
2387 int err = 0, last_err = 0;
2388
2389 beginning:
2390 rtnh = (struct rtnexthop *)cfg->fc_mp;
2391 remaining = cfg->fc_mp_len;
2392
2393 /* Parse a Multipath Entry */
2394 while (rtnh_ok(rtnh, remaining)) {
2395 memcpy(&r_cfg, cfg, sizeof(*cfg));
2396 if (rtnh->rtnh_ifindex)
2397 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2398
2399 attrlen = rtnh_attrlen(rtnh);
2400 if (attrlen > 0) {
2401 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2402
2403 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2404 if (nla) {
2405 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2406 r_cfg.fc_flags |= RTF_GATEWAY;
2407 }
2408 }
2409 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2410 if (err) {
2411 last_err = err;
2412 /* If we are trying to remove a route, do not stop the
2413 * loop when ip6_route_del() fails (because next hop is
2414 * already gone), we should try to remove all next hops.
2415 */
2416 if (add) {
2417 /* If add fails, we should try to delete all
2418 * next hops that have been already added.
2419 */
2420 add = 0;
2421 goto beginning;
2422 }
2423 }
2424 /* Because each route is added like a single route we remove
2425 * this flag after the first nexthop (if there is a collision,
2426 * we have already fail to add the first nexthop:
2427 * fib6_add_rt2node() has reject it).
2428 */
2429 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2430 rtnh = rtnh_next(rtnh, &remaining);
2431 }
2432
2433 return last_err;
2434 }
2435
2436 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2437 {
2438 struct fib6_config cfg;
2439 int err;
2440
2441 err = rtm_to_fib6_config(skb, nlh, &cfg);
2442 if (err < 0)
2443 return err;
2444
2445 if (cfg.fc_mp)
2446 return ip6_route_multipath(&cfg, 0);
2447 else
2448 return ip6_route_del(&cfg);
2449 }
2450
2451 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2452 {
2453 struct fib6_config cfg;
2454 int err;
2455
2456 err = rtm_to_fib6_config(skb, nlh, &cfg);
2457 if (err < 0)
2458 return err;
2459
2460 if (cfg.fc_mp)
2461 return ip6_route_multipath(&cfg, 1);
2462 else
2463 return ip6_route_add(&cfg);
2464 }
2465
2466 static inline size_t rt6_nlmsg_size(void)
2467 {
2468 return NLMSG_ALIGN(sizeof(struct rtmsg))
2469 + nla_total_size(16) /* RTA_SRC */
2470 + nla_total_size(16) /* RTA_DST */
2471 + nla_total_size(16) /* RTA_GATEWAY */
2472 + nla_total_size(16) /* RTA_PREFSRC */
2473 + nla_total_size(4) /* RTA_TABLE */
2474 + nla_total_size(4) /* RTA_IIF */
2475 + nla_total_size(4) /* RTA_OIF */
2476 + nla_total_size(4) /* RTA_PRIORITY */
2477 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2478 + nla_total_size(sizeof(struct rta_cacheinfo));
2479 }
2480
2481 static int rt6_fill_node(struct net *net,
2482 struct sk_buff *skb, struct rt6_info *rt,
2483 struct in6_addr *dst, struct in6_addr *src,
2484 int iif, int type, u32 portid, u32 seq,
2485 int prefix, int nowait, unsigned int flags)
2486 {
2487 struct rtmsg *rtm;
2488 struct nlmsghdr *nlh;
2489 long expires;
2490 u32 table;
2491
2492 if (prefix) { /* user wants prefix routes only */
2493 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2494 /* success since this is not a prefix route */
2495 return 1;
2496 }
2497 }
2498
2499 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2500 if (!nlh)
2501 return -EMSGSIZE;
2502
2503 rtm = nlmsg_data(nlh);
2504 rtm->rtm_family = AF_INET6;
2505 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2506 rtm->rtm_src_len = rt->rt6i_src.plen;
2507 rtm->rtm_tos = 0;
2508 if (rt->rt6i_table)
2509 table = rt->rt6i_table->tb6_id;
2510 else
2511 table = RT6_TABLE_UNSPEC;
2512 rtm->rtm_table = table;
2513 if (nla_put_u32(skb, RTA_TABLE, table))
2514 goto nla_put_failure;
2515 if (rt->rt6i_flags & RTF_REJECT) {
2516 switch (rt->dst.error) {
2517 case -EINVAL:
2518 rtm->rtm_type = RTN_BLACKHOLE;
2519 break;
2520 case -EACCES:
2521 rtm->rtm_type = RTN_PROHIBIT;
2522 break;
2523 case -EAGAIN:
2524 rtm->rtm_type = RTN_THROW;
2525 break;
2526 default:
2527 rtm->rtm_type = RTN_UNREACHABLE;
2528 break;
2529 }
2530 }
2531 else if (rt->rt6i_flags & RTF_LOCAL)
2532 rtm->rtm_type = RTN_LOCAL;
2533 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2534 rtm->rtm_type = RTN_LOCAL;
2535 else
2536 rtm->rtm_type = RTN_UNICAST;
2537 rtm->rtm_flags = 0;
2538 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2539 rtm->rtm_protocol = rt->rt6i_protocol;
2540 if (rt->rt6i_flags & RTF_DYNAMIC)
2541 rtm->rtm_protocol = RTPROT_REDIRECT;
2542 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2543 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2544 rtm->rtm_protocol = RTPROT_RA;
2545 else
2546 rtm->rtm_protocol = RTPROT_KERNEL;
2547 }
2548
2549 if (rt->rt6i_flags & RTF_CACHE)
2550 rtm->rtm_flags |= RTM_F_CLONED;
2551
2552 if (dst) {
2553 if (nla_put(skb, RTA_DST, 16, dst))
2554 goto nla_put_failure;
2555 rtm->rtm_dst_len = 128;
2556 } else if (rtm->rtm_dst_len)
2557 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2558 goto nla_put_failure;
2559 #ifdef CONFIG_IPV6_SUBTREES
2560 if (src) {
2561 if (nla_put(skb, RTA_SRC, 16, src))
2562 goto nla_put_failure;
2563 rtm->rtm_src_len = 128;
2564 } else if (rtm->rtm_src_len &&
2565 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2566 goto nla_put_failure;
2567 #endif
2568 if (iif) {
2569 #ifdef CONFIG_IPV6_MROUTE
2570 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2571 int err = ip6mr_get_route(net, skb, rtm, nowait);
2572 if (err <= 0) {
2573 if (!nowait) {
2574 if (err == 0)
2575 return 0;
2576 goto nla_put_failure;
2577 } else {
2578 if (err == -EMSGSIZE)
2579 goto nla_put_failure;
2580 }
2581 }
2582 } else
2583 #endif
2584 if (nla_put_u32(skb, RTA_IIF, iif))
2585 goto nla_put_failure;
2586 } else if (dst) {
2587 struct in6_addr saddr_buf;
2588 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2589 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2590 goto nla_put_failure;
2591 }
2592
2593 if (rt->rt6i_prefsrc.plen) {
2594 struct in6_addr saddr_buf;
2595 saddr_buf = rt->rt6i_prefsrc.addr;
2596 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2597 goto nla_put_failure;
2598 }
2599
2600 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2601 goto nla_put_failure;
2602
2603 if (rt->rt6i_flags & RTF_GATEWAY) {
2604 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2605 goto nla_put_failure;
2606 }
2607
2608 if (rt->dst.dev &&
2609 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2610 goto nla_put_failure;
2611 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2612 goto nla_put_failure;
2613
2614 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2615
2616 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2617 goto nla_put_failure;
2618
2619 return nlmsg_end(skb, nlh);
2620
2621 nla_put_failure:
2622 nlmsg_cancel(skb, nlh);
2623 return -EMSGSIZE;
2624 }
2625
2626 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2627 {
2628 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2629 int prefix;
2630
2631 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2632 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2633 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2634 } else
2635 prefix = 0;
2636
2637 return rt6_fill_node(arg->net,
2638 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2639 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2640 prefix, 0, NLM_F_MULTI);
2641 }
2642
2643 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2644 {
2645 struct net *net = sock_net(in_skb->sk);
2646 struct nlattr *tb[RTA_MAX+1];
2647 struct rt6_info *rt;
2648 struct sk_buff *skb;
2649 struct rtmsg *rtm;
2650 struct flowi6 fl6;
2651 int err, iif = 0, oif = 0;
2652
2653 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2654 if (err < 0)
2655 goto errout;
2656
2657 err = -EINVAL;
2658 memset(&fl6, 0, sizeof(fl6));
2659
2660 if (tb[RTA_SRC]) {
2661 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2662 goto errout;
2663
2664 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2665 }
2666
2667 if (tb[RTA_DST]) {
2668 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2669 goto errout;
2670
2671 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2672 }
2673
2674 if (tb[RTA_IIF])
2675 iif = nla_get_u32(tb[RTA_IIF]);
2676
2677 if (tb[RTA_OIF])
2678 oif = nla_get_u32(tb[RTA_OIF]);
2679
2680 if (iif) {
2681 struct net_device *dev;
2682 int flags = 0;
2683
2684 dev = __dev_get_by_index(net, iif);
2685 if (!dev) {
2686 err = -ENODEV;
2687 goto errout;
2688 }
2689
2690 fl6.flowi6_iif = iif;
2691
2692 if (!ipv6_addr_any(&fl6.saddr))
2693 flags |= RT6_LOOKUP_F_HAS_SADDR;
2694
2695 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2696 flags);
2697 } else {
2698 fl6.flowi6_oif = oif;
2699
2700 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2701 }
2702
2703 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2704 if (!skb) {
2705 ip6_rt_put(rt);
2706 err = -ENOBUFS;
2707 goto errout;
2708 }
2709
2710 /* Reserve room for dummy headers, this skb can pass
2711 through good chunk of routing engine.
2712 */
2713 skb_reset_mac_header(skb);
2714 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2715
2716 skb_dst_set(skb, &rt->dst);
2717
2718 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2719 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2720 nlh->nlmsg_seq, 0, 0, 0);
2721 if (err < 0) {
2722 kfree_skb(skb);
2723 goto errout;
2724 }
2725
2726 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2727 errout:
2728 return err;
2729 }
2730
2731 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2732 {
2733 struct sk_buff *skb;
2734 struct net *net = info->nl_net;
2735 u32 seq;
2736 int err;
2737
2738 err = -ENOBUFS;
2739 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2740
2741 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2742 if (!skb)
2743 goto errout;
2744
2745 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2746 event, info->portid, seq, 0, 0, 0);
2747 if (err < 0) {
2748 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2749 WARN_ON(err == -EMSGSIZE);
2750 kfree_skb(skb);
2751 goto errout;
2752 }
2753 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2754 info->nlh, gfp_any());
2755 return;
2756 errout:
2757 if (err < 0)
2758 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2759 }
2760
2761 static int ip6_route_dev_notify(struct notifier_block *this,
2762 unsigned long event, void *data)
2763 {
2764 struct net_device *dev = (struct net_device *)data;
2765 struct net *net = dev_net(dev);
2766
2767 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2768 net->ipv6.ip6_null_entry->dst.dev = dev;
2769 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2770 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2771 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2772 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2773 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2774 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2775 #endif
2776 }
2777
2778 return NOTIFY_OK;
2779 }
2780
2781 /*
2782 * /proc
2783 */
2784
2785 #ifdef CONFIG_PROC_FS
2786
2787 struct rt6_proc_arg
2788 {
2789 char *buffer;
2790 int offset;
2791 int length;
2792 int skip;
2793 int len;
2794 };
2795
2796 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2797 {
2798 struct seq_file *m = p_arg;
2799
2800 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2801
2802 #ifdef CONFIG_IPV6_SUBTREES
2803 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2804 #else
2805 seq_puts(m, "00000000000000000000000000000000 00 ");
2806 #endif
2807 if (rt->rt6i_flags & RTF_GATEWAY) {
2808 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2809 } else {
2810 seq_puts(m, "00000000000000000000000000000000");
2811 }
2812 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2813 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2814 rt->dst.__use, rt->rt6i_flags,
2815 rt->dst.dev ? rt->dst.dev->name : "");
2816 return 0;
2817 }
2818
2819 static int ipv6_route_show(struct seq_file *m, void *v)
2820 {
2821 struct net *net = (struct net *)m->private;
2822 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2823 return 0;
2824 }
2825
2826 static int ipv6_route_open(struct inode *inode, struct file *file)
2827 {
2828 return single_open_net(inode, file, ipv6_route_show);
2829 }
2830
2831 static const struct file_operations ipv6_route_proc_fops = {
2832 .owner = THIS_MODULE,
2833 .open = ipv6_route_open,
2834 .read = seq_read,
2835 .llseek = seq_lseek,
2836 .release = single_release_net,
2837 };
2838
2839 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2840 {
2841 struct net *net = (struct net *)seq->private;
2842 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2843 net->ipv6.rt6_stats->fib_nodes,
2844 net->ipv6.rt6_stats->fib_route_nodes,
2845 net->ipv6.rt6_stats->fib_rt_alloc,
2846 net->ipv6.rt6_stats->fib_rt_entries,
2847 net->ipv6.rt6_stats->fib_rt_cache,
2848 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2849 net->ipv6.rt6_stats->fib_discarded_routes);
2850
2851 return 0;
2852 }
2853
2854 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2855 {
2856 return single_open_net(inode, file, rt6_stats_seq_show);
2857 }
2858
2859 static const struct file_operations rt6_stats_seq_fops = {
2860 .owner = THIS_MODULE,
2861 .open = rt6_stats_seq_open,
2862 .read = seq_read,
2863 .llseek = seq_lseek,
2864 .release = single_release_net,
2865 };
2866 #endif /* CONFIG_PROC_FS */
2867
2868 #ifdef CONFIG_SYSCTL
2869
2870 static
2871 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2872 void __user *buffer, size_t *lenp, loff_t *ppos)
2873 {
2874 struct net *net;
2875 int delay;
2876 if (!write)
2877 return -EINVAL;
2878
2879 net = (struct net *)ctl->extra1;
2880 delay = net->ipv6.sysctl.flush_delay;
2881 proc_dointvec(ctl, write, buffer, lenp, ppos);
2882 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2883 return 0;
2884 }
2885
2886 ctl_table ipv6_route_table_template[] = {
2887 {
2888 .procname = "flush",
2889 .data = &init_net.ipv6.sysctl.flush_delay,
2890 .maxlen = sizeof(int),
2891 .mode = 0200,
2892 .proc_handler = ipv6_sysctl_rtcache_flush
2893 },
2894 {
2895 .procname = "gc_thresh",
2896 .data = &ip6_dst_ops_template.gc_thresh,
2897 .maxlen = sizeof(int),
2898 .mode = 0644,
2899 .proc_handler = proc_dointvec,
2900 },
2901 {
2902 .procname = "max_size",
2903 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2904 .maxlen = sizeof(int),
2905 .mode = 0644,
2906 .proc_handler = proc_dointvec,
2907 },
2908 {
2909 .procname = "gc_min_interval",
2910 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2911 .maxlen = sizeof(int),
2912 .mode = 0644,
2913 .proc_handler = proc_dointvec_jiffies,
2914 },
2915 {
2916 .procname = "gc_timeout",
2917 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2918 .maxlen = sizeof(int),
2919 .mode = 0644,
2920 .proc_handler = proc_dointvec_jiffies,
2921 },
2922 {
2923 .procname = "gc_interval",
2924 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2925 .maxlen = sizeof(int),
2926 .mode = 0644,
2927 .proc_handler = proc_dointvec_jiffies,
2928 },
2929 {
2930 .procname = "gc_elasticity",
2931 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2932 .maxlen = sizeof(int),
2933 .mode = 0644,
2934 .proc_handler = proc_dointvec,
2935 },
2936 {
2937 .procname = "mtu_expires",
2938 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2939 .maxlen = sizeof(int),
2940 .mode = 0644,
2941 .proc_handler = proc_dointvec_jiffies,
2942 },
2943 {
2944 .procname = "min_adv_mss",
2945 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2946 .maxlen = sizeof(int),
2947 .mode = 0644,
2948 .proc_handler = proc_dointvec,
2949 },
2950 {
2951 .procname = "gc_min_interval_ms",
2952 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2953 .maxlen = sizeof(int),
2954 .mode = 0644,
2955 .proc_handler = proc_dointvec_ms_jiffies,
2956 },
2957 { }
2958 };
2959
2960 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2961 {
2962 struct ctl_table *table;
2963
2964 table = kmemdup(ipv6_route_table_template,
2965 sizeof(ipv6_route_table_template),
2966 GFP_KERNEL);
2967
2968 if (table) {
2969 table[0].data = &net->ipv6.sysctl.flush_delay;
2970 table[0].extra1 = net;
2971 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2972 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2973 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2974 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2975 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2976 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2977 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2978 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2979 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2980
2981 /* Don't export sysctls to unprivileged users */
2982 if (net->user_ns != &init_user_ns)
2983 table[0].procname = NULL;
2984 }
2985
2986 return table;
2987 }
2988 #endif
2989
2990 static int __net_init ip6_route_net_init(struct net *net)
2991 {
2992 int ret = -ENOMEM;
2993
2994 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2995 sizeof(net->ipv6.ip6_dst_ops));
2996
2997 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2998 goto out_ip6_dst_ops;
2999
3000 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3001 sizeof(*net->ipv6.ip6_null_entry),
3002 GFP_KERNEL);
3003 if (!net->ipv6.ip6_null_entry)
3004 goto out_ip6_dst_entries;
3005 net->ipv6.ip6_null_entry->dst.path =
3006 (struct dst_entry *)net->ipv6.ip6_null_entry;
3007 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3008 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3009 ip6_template_metrics, true);
3010
3011 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3012 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3013 sizeof(*net->ipv6.ip6_prohibit_entry),
3014 GFP_KERNEL);
3015 if (!net->ipv6.ip6_prohibit_entry)
3016 goto out_ip6_null_entry;
3017 net->ipv6.ip6_prohibit_entry->dst.path =
3018 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3019 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3020 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3021 ip6_template_metrics, true);
3022
3023 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3024 sizeof(*net->ipv6.ip6_blk_hole_entry),
3025 GFP_KERNEL);
3026 if (!net->ipv6.ip6_blk_hole_entry)
3027 goto out_ip6_prohibit_entry;
3028 net->ipv6.ip6_blk_hole_entry->dst.path =
3029 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3030 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3031 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3032 ip6_template_metrics, true);
3033 #endif
3034
3035 net->ipv6.sysctl.flush_delay = 0;
3036 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3037 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3038 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3039 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3040 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3041 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3042 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3043
3044 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3045
3046 ret = 0;
3047 out:
3048 return ret;
3049
3050 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3051 out_ip6_prohibit_entry:
3052 kfree(net->ipv6.ip6_prohibit_entry);
3053 out_ip6_null_entry:
3054 kfree(net->ipv6.ip6_null_entry);
3055 #endif
3056 out_ip6_dst_entries:
3057 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3058 out_ip6_dst_ops:
3059 goto out;
3060 }
3061
3062 static void __net_exit ip6_route_net_exit(struct net *net)
3063 {
3064 kfree(net->ipv6.ip6_null_entry);
3065 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3066 kfree(net->ipv6.ip6_prohibit_entry);
3067 kfree(net->ipv6.ip6_blk_hole_entry);
3068 #endif
3069 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3070 }
3071
3072 static int __net_init ip6_route_net_init_late(struct net *net)
3073 {
3074 #ifdef CONFIG_PROC_FS
3075 proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
3076 proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
3077 #endif
3078 return 0;
3079 }
3080
3081 static void __net_exit ip6_route_net_exit_late(struct net *net)
3082 {
3083 #ifdef CONFIG_PROC_FS
3084 proc_net_remove(net, "ipv6_route");
3085 proc_net_remove(net, "rt6_stats");
3086 #endif
3087 }
3088
3089 static struct pernet_operations ip6_route_net_ops = {
3090 .init = ip6_route_net_init,
3091 .exit = ip6_route_net_exit,
3092 };
3093
3094 static int __net_init ipv6_inetpeer_init(struct net *net)
3095 {
3096 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3097
3098 if (!bp)
3099 return -ENOMEM;
3100 inet_peer_base_init(bp);
3101 net->ipv6.peers = bp;
3102 return 0;
3103 }
3104
3105 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3106 {
3107 struct inet_peer_base *bp = net->ipv6.peers;
3108
3109 net->ipv6.peers = NULL;
3110 inetpeer_invalidate_tree(bp);
3111 kfree(bp);
3112 }
3113
3114 static struct pernet_operations ipv6_inetpeer_ops = {
3115 .init = ipv6_inetpeer_init,
3116 .exit = ipv6_inetpeer_exit,
3117 };
3118
3119 static struct pernet_operations ip6_route_net_late_ops = {
3120 .init = ip6_route_net_init_late,
3121 .exit = ip6_route_net_exit_late,
3122 };
3123
3124 static struct notifier_block ip6_route_dev_notifier = {
3125 .notifier_call = ip6_route_dev_notify,
3126 .priority = 0,
3127 };
3128
3129 int __init ip6_route_init(void)
3130 {
3131 int ret;
3132
3133 ret = -ENOMEM;
3134 ip6_dst_ops_template.kmem_cachep =
3135 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3136 SLAB_HWCACHE_ALIGN, NULL);
3137 if (!ip6_dst_ops_template.kmem_cachep)
3138 goto out;
3139
3140 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3141 if (ret)
3142 goto out_kmem_cache;
3143
3144 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3145 if (ret)
3146 goto out_dst_entries;
3147
3148 ret = register_pernet_subsys(&ip6_route_net_ops);
3149 if (ret)
3150 goto out_register_inetpeer;
3151
3152 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3153
3154 /* Registering of the loopback is done before this portion of code,
3155 * the loopback reference in rt6_info will not be taken, do it
3156 * manually for init_net */
3157 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3158 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3159 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3160 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3161 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3162 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3163 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3164 #endif
3165 ret = fib6_init();
3166 if (ret)
3167 goto out_register_subsys;
3168
3169 ret = xfrm6_init();
3170 if (ret)
3171 goto out_fib6_init;
3172
3173 ret = fib6_rules_init();
3174 if (ret)
3175 goto xfrm6_init;
3176
3177 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3178 if (ret)
3179 goto fib6_rules_init;
3180
3181 ret = -ENOBUFS;
3182 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3183 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3184 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3185 goto out_register_late_subsys;
3186
3187 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3188 if (ret)
3189 goto out_register_late_subsys;
3190
3191 out:
3192 return ret;
3193
3194 out_register_late_subsys:
3195 unregister_pernet_subsys(&ip6_route_net_late_ops);
3196 fib6_rules_init:
3197 fib6_rules_cleanup();
3198 xfrm6_init:
3199 xfrm6_fini();
3200 out_fib6_init:
3201 fib6_gc_cleanup();
3202 out_register_subsys:
3203 unregister_pernet_subsys(&ip6_route_net_ops);
3204 out_register_inetpeer:
3205 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3206 out_dst_entries:
3207 dst_entries_destroy(&ip6_dst_blackhole_ops);
3208 out_kmem_cache:
3209 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3210 goto out;
3211 }
3212
3213 void ip6_route_cleanup(void)
3214 {
3215 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3216 unregister_pernet_subsys(&ip6_route_net_late_ops);
3217 fib6_rules_cleanup();
3218 xfrm6_fini();
3219 fib6_gc_cleanup();
3220 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3221 unregister_pernet_subsys(&ip6_route_net_ops);
3222 dst_entries_destroy(&ip6_dst_blackhole_ops);
3223 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3224 }
Linus' kernel tree