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2839381116ea574a1faf95d71954797074718bfc
[deliverable/linux.git] / net / ipv6 / route.c
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/xfrm.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
61
62 #include <asm/uaccess.h>
63
64 #ifdef CONFIG_SYSCTL
65 #include <linux/sysctl.h>
66 #endif
67
68 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 neigh = rt->n;
550 if (rt->rt6i_flags & RTF_NONEXTHOP ||
551 !(rt->rt6i_flags & RTF_GATEWAY))
552 ret = true;
553 else if (neigh) {
554 read_lock_bh(&neigh->lock);
555 if (neigh->nud_state & NUD_VALID)
556 ret = true;
557 #ifdef CONFIG_IPV6_ROUTER_PREF
558 else if (!(neigh->nud_state & NUD_FAILED))
559 ret = true;
560 #endif
561 read_unlock_bh(&neigh->lock);
562 }
563 return ret;
564 }
565
566 static int rt6_score_route(struct rt6_info *rt, int oif,
567 int strict)
568 {
569 int m;
570
571 m = rt6_check_dev(rt, oif);
572 if (!m && (strict & RT6_LOOKUP_F_IFACE))
573 return -1;
574 #ifdef CONFIG_IPV6_ROUTER_PREF
575 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
576 #endif
577 if (!rt6_check_neigh(rt) && (strict & RT6_LOOKUP_F_REACHABLE))
578 return -1;
579 return m;
580 }
581
582 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
583 int *mpri, struct rt6_info *match)
584 {
585 int m;
586
587 if (rt6_check_expired(rt))
588 goto out;
589
590 m = rt6_score_route(rt, oif, strict);
591 if (m < 0)
592 goto out;
593
594 if (m > *mpri) {
595 if (strict & RT6_LOOKUP_F_REACHABLE)
596 rt6_probe(match);
597 *mpri = m;
598 match = rt;
599 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
600 rt6_probe(rt);
601 }
602
603 out:
604 return match;
605 }
606
607 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
608 struct rt6_info *rr_head,
609 u32 metric, int oif, int strict)
610 {
611 struct rt6_info *rt, *match;
612 int mpri = -1;
613
614 match = NULL;
615 for (rt = rr_head; rt && rt->rt6i_metric == metric;
616 rt = rt->dst.rt6_next)
617 match = find_match(rt, oif, strict, &mpri, match);
618 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
619 rt = rt->dst.rt6_next)
620 match = find_match(rt, oif, strict, &mpri, match);
621
622 return match;
623 }
624
625 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
626 {
627 struct rt6_info *match, *rt0;
628 struct net *net;
629
630 rt0 = fn->rr_ptr;
631 if (!rt0)
632 fn->rr_ptr = rt0 = fn->leaf;
633
634 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
635
636 if (!match &&
637 (strict & RT6_LOOKUP_F_REACHABLE)) {
638 struct rt6_info *next = rt0->dst.rt6_next;
639
640 /* no entries matched; do round-robin */
641 if (!next || next->rt6i_metric != rt0->rt6i_metric)
642 next = fn->leaf;
643
644 if (next != rt0)
645 fn->rr_ptr = next;
646 }
647
648 net = dev_net(rt0->dst.dev);
649 return match ? match : net->ipv6.ip6_null_entry;
650 }
651
652 #ifdef CONFIG_IPV6_ROUTE_INFO
653 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
654 const struct in6_addr *gwaddr)
655 {
656 struct net *net = dev_net(dev);
657 struct route_info *rinfo = (struct route_info *) opt;
658 struct in6_addr prefix_buf, *prefix;
659 unsigned int pref;
660 unsigned long lifetime;
661 struct rt6_info *rt;
662
663 if (len < sizeof(struct route_info)) {
664 return -EINVAL;
665 }
666
667 /* Sanity check for prefix_len and length */
668 if (rinfo->length > 3) {
669 return -EINVAL;
670 } else if (rinfo->prefix_len > 128) {
671 return -EINVAL;
672 } else if (rinfo->prefix_len > 64) {
673 if (rinfo->length < 2) {
674 return -EINVAL;
675 }
676 } else if (rinfo->prefix_len > 0) {
677 if (rinfo->length < 1) {
678 return -EINVAL;
679 }
680 }
681
682 pref = rinfo->route_pref;
683 if (pref == ICMPV6_ROUTER_PREF_INVALID)
684 return -EINVAL;
685
686 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
687
688 if (rinfo->length == 3)
689 prefix = (struct in6_addr *)rinfo->prefix;
690 else {
691 /* this function is safe */
692 ipv6_addr_prefix(&prefix_buf,
693 (struct in6_addr *)rinfo->prefix,
694 rinfo->prefix_len);
695 prefix = &prefix_buf;
696 }
697
698 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
699 dev->ifindex);
700
701 if (rt && !lifetime) {
702 ip6_del_rt(rt);
703 rt = NULL;
704 }
705
706 if (!rt && lifetime)
707 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
708 pref);
709 else if (rt)
710 rt->rt6i_flags = RTF_ROUTEINFO |
711 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
712
713 if (rt) {
714 if (!addrconf_finite_timeout(lifetime))
715 rt6_clean_expires(rt);
716 else
717 rt6_set_expires(rt, jiffies + HZ * lifetime);
718
719 ip6_rt_put(rt);
720 }
721 return 0;
722 }
723 #endif
724
725 #define BACKTRACK(__net, saddr) \
726 do { \
727 if (rt == __net->ipv6.ip6_null_entry) { \
728 struct fib6_node *pn; \
729 while (1) { \
730 if (fn->fn_flags & RTN_TL_ROOT) \
731 goto out; \
732 pn = fn->parent; \
733 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
734 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
735 else \
736 fn = pn; \
737 if (fn->fn_flags & RTN_RTINFO) \
738 goto restart; \
739 } \
740 } \
741 } while (0)
742
743 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
744 struct fib6_table *table,
745 struct flowi6 *fl6, int flags)
746 {
747 struct fib6_node *fn;
748 struct rt6_info *rt;
749
750 read_lock_bh(&table->tb6_lock);
751 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
752 restart:
753 rt = fn->leaf;
754 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
755 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
756 rt = rt6_multipath_select(rt, fl6);
757 BACKTRACK(net, &fl6->saddr);
758 out:
759 dst_use(&rt->dst, jiffies);
760 read_unlock_bh(&table->tb6_lock);
761 return rt;
762
763 }
764
765 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
766 int flags)
767 {
768 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
769 }
770 EXPORT_SYMBOL_GPL(ip6_route_lookup);
771
772 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
773 const struct in6_addr *saddr, int oif, int strict)
774 {
775 struct flowi6 fl6 = {
776 .flowi6_oif = oif,
777 .daddr = *daddr,
778 };
779 struct dst_entry *dst;
780 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
781
782 if (saddr) {
783 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
784 flags |= RT6_LOOKUP_F_HAS_SADDR;
785 }
786
787 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
788 if (dst->error == 0)
789 return (struct rt6_info *) dst;
790
791 dst_release(dst);
792
793 return NULL;
794 }
795
796 EXPORT_SYMBOL(rt6_lookup);
797
798 /* ip6_ins_rt is called with FREE table->tb6_lock.
799 It takes new route entry, the addition fails by any reason the
800 route is freed. In any case, if caller does not hold it, it may
801 be destroyed.
802 */
803
804 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
805 {
806 int err;
807 struct fib6_table *table;
808
809 table = rt->rt6i_table;
810 write_lock_bh(&table->tb6_lock);
811 err = fib6_add(&table->tb6_root, rt, info);
812 write_unlock_bh(&table->tb6_lock);
813
814 return err;
815 }
816
817 int ip6_ins_rt(struct rt6_info *rt)
818 {
819 struct nl_info info = {
820 .nl_net = dev_net(rt->dst.dev),
821 };
822 return __ip6_ins_rt(rt, &info);
823 }
824
825 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
826 const struct in6_addr *daddr,
827 const struct in6_addr *saddr)
828 {
829 struct rt6_info *rt;
830
831 /*
832 * Clone the route.
833 */
834
835 rt = ip6_rt_copy(ort, daddr);
836
837 if (rt) {
838 int attempts = !in_softirq();
839
840 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
841 if (ort->rt6i_dst.plen != 128 &&
842 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
843 rt->rt6i_flags |= RTF_ANYCAST;
844 rt->rt6i_gateway = *daddr;
845 }
846
847 rt->rt6i_flags |= RTF_CACHE;
848
849 #ifdef CONFIG_IPV6_SUBTREES
850 if (rt->rt6i_src.plen && saddr) {
851 rt->rt6i_src.addr = *saddr;
852 rt->rt6i_src.plen = 128;
853 }
854 #endif
855
856 retry:
857 if (rt6_bind_neighbour(rt, rt->dst.dev)) {
858 struct net *net = dev_net(rt->dst.dev);
859 int saved_rt_min_interval =
860 net->ipv6.sysctl.ip6_rt_gc_min_interval;
861 int saved_rt_elasticity =
862 net->ipv6.sysctl.ip6_rt_gc_elasticity;
863
864 if (attempts-- > 0) {
865 net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
866 net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;
867
868 ip6_dst_gc(&net->ipv6.ip6_dst_ops);
869
870 net->ipv6.sysctl.ip6_rt_gc_elasticity =
871 saved_rt_elasticity;
872 net->ipv6.sysctl.ip6_rt_gc_min_interval =
873 saved_rt_min_interval;
874 goto retry;
875 }
876
877 net_warn_ratelimited("Neighbour table overflow\n");
878 dst_free(&rt->dst);
879 return NULL;
880 }
881 }
882
883 return rt;
884 }
885
886 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
887 const struct in6_addr *daddr)
888 {
889 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
890
891 if (rt) {
892 rt->rt6i_flags |= RTF_CACHE;
893 rt->n = neigh_clone(ort->n);
894 }
895 return rt;
896 }
897
898 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
899 struct flowi6 *fl6, int flags)
900 {
901 struct fib6_node *fn;
902 struct rt6_info *rt, *nrt;
903 int strict = 0;
904 int attempts = 3;
905 int err;
906 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
907
908 strict |= flags & RT6_LOOKUP_F_IFACE;
909
910 relookup:
911 read_lock_bh(&table->tb6_lock);
912
913 restart_2:
914 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
915
916 restart:
917 rt = rt6_select(fn, oif, strict | reachable);
918 if (rt->rt6i_nsiblings && oif == 0)
919 rt = rt6_multipath_select(rt, fl6);
920 BACKTRACK(net, &fl6->saddr);
921 if (rt == net->ipv6.ip6_null_entry ||
922 rt->rt6i_flags & RTF_CACHE)
923 goto out;
924
925 dst_hold(&rt->dst);
926 read_unlock_bh(&table->tb6_lock);
927
928 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
929 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
930 else if (!(rt->dst.flags & DST_HOST))
931 nrt = rt6_alloc_clone(rt, &fl6->daddr);
932 else
933 goto out2;
934
935 ip6_rt_put(rt);
936 rt = nrt ? : net->ipv6.ip6_null_entry;
937
938 dst_hold(&rt->dst);
939 if (nrt) {
940 err = ip6_ins_rt(nrt);
941 if (!err)
942 goto out2;
943 }
944
945 if (--attempts <= 0)
946 goto out2;
947
948 /*
949 * Race condition! In the gap, when table->tb6_lock was
950 * released someone could insert this route. Relookup.
951 */
952 ip6_rt_put(rt);
953 goto relookup;
954
955 out:
956 if (reachable) {
957 reachable = 0;
958 goto restart_2;
959 }
960 dst_hold(&rt->dst);
961 read_unlock_bh(&table->tb6_lock);
962 out2:
963 rt->dst.lastuse = jiffies;
964 rt->dst.__use++;
965
966 return rt;
967 }
968
969 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
970 struct flowi6 *fl6, int flags)
971 {
972 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
973 }
974
975 static struct dst_entry *ip6_route_input_lookup(struct net *net,
976 struct net_device *dev,
977 struct flowi6 *fl6, int flags)
978 {
979 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
980 flags |= RT6_LOOKUP_F_IFACE;
981
982 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
983 }
984
985 void ip6_route_input(struct sk_buff *skb)
986 {
987 const struct ipv6hdr *iph = ipv6_hdr(skb);
988 struct net *net = dev_net(skb->dev);
989 int flags = RT6_LOOKUP_F_HAS_SADDR;
990 struct flowi6 fl6 = {
991 .flowi6_iif = skb->dev->ifindex,
992 .daddr = iph->daddr,
993 .saddr = iph->saddr,
994 .flowlabel = ip6_flowinfo(iph),
995 .flowi6_mark = skb->mark,
996 .flowi6_proto = iph->nexthdr,
997 };
998
999 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1000 }
1001
1002 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1003 struct flowi6 *fl6, int flags)
1004 {
1005 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1006 }
1007
1008 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1009 struct flowi6 *fl6)
1010 {
1011 int flags = 0;
1012
1013 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1014
1015 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1016 flags |= RT6_LOOKUP_F_IFACE;
1017
1018 if (!ipv6_addr_any(&fl6->saddr))
1019 flags |= RT6_LOOKUP_F_HAS_SADDR;
1020 else if (sk)
1021 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1022
1023 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1024 }
1025
1026 EXPORT_SYMBOL(ip6_route_output);
1027
1028 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1029 {
1030 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1031 struct dst_entry *new = NULL;
1032
1033 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1034 if (rt) {
1035 new = &rt->dst;
1036
1037 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1038 rt6_init_peer(rt, net->ipv6.peers);
1039
1040 new->__use = 1;
1041 new->input = dst_discard;
1042 new->output = dst_discard;
1043
1044 if (dst_metrics_read_only(&ort->dst))
1045 new->_metrics = ort->dst._metrics;
1046 else
1047 dst_copy_metrics(new, &ort->dst);
1048 rt->rt6i_idev = ort->rt6i_idev;
1049 if (rt->rt6i_idev)
1050 in6_dev_hold(rt->rt6i_idev);
1051
1052 rt->rt6i_gateway = ort->rt6i_gateway;
1053 rt->rt6i_flags = ort->rt6i_flags;
1054 rt6_clean_expires(rt);
1055 rt->rt6i_metric = 0;
1056
1057 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1058 #ifdef CONFIG_IPV6_SUBTREES
1059 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1060 #endif
1061
1062 dst_free(new);
1063 }
1064
1065 dst_release(dst_orig);
1066 return new ? new : ERR_PTR(-ENOMEM);
1067 }
1068
1069 /*
1070 * Destination cache support functions
1071 */
1072
1073 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1074 {
1075 struct rt6_info *rt;
1076
1077 rt = (struct rt6_info *) dst;
1078
1079 /* All IPV6 dsts are created with ->obsolete set to the value
1080 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1081 * into this function always.
1082 */
1083 if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1084 return NULL;
1085
1086 if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
1087 return dst;
1088
1089 return NULL;
1090 }
1091
1092 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1093 {
1094 struct rt6_info *rt = (struct rt6_info *) dst;
1095
1096 if (rt) {
1097 if (rt->rt6i_flags & RTF_CACHE) {
1098 if (rt6_check_expired(rt)) {
1099 ip6_del_rt(rt);
1100 dst = NULL;
1101 }
1102 } else {
1103 dst_release(dst);
1104 dst = NULL;
1105 }
1106 }
1107 return dst;
1108 }
1109
1110 static void ip6_link_failure(struct sk_buff *skb)
1111 {
1112 struct rt6_info *rt;
1113
1114 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1115
1116 rt = (struct rt6_info *) skb_dst(skb);
1117 if (rt) {
1118 if (rt->rt6i_flags & RTF_CACHE)
1119 rt6_update_expires(rt, 0);
1120 else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
1121 rt->rt6i_node->fn_sernum = -1;
1122 }
1123 }
1124
1125 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1126 struct sk_buff *skb, u32 mtu)
1127 {
1128 struct rt6_info *rt6 = (struct rt6_info*)dst;
1129
1130 dst_confirm(dst);
1131 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1132 struct net *net = dev_net(dst->dev);
1133
1134 rt6->rt6i_flags |= RTF_MODIFIED;
1135 if (mtu < IPV6_MIN_MTU) {
1136 u32 features = dst_metric(dst, RTAX_FEATURES);
1137 mtu = IPV6_MIN_MTU;
1138 features |= RTAX_FEATURE_ALLFRAG;
1139 dst_metric_set(dst, RTAX_FEATURES, features);
1140 }
1141 dst_metric_set(dst, RTAX_MTU, mtu);
1142 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1143 }
1144 }
1145
1146 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1147 int oif, u32 mark)
1148 {
1149 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1150 struct dst_entry *dst;
1151 struct flowi6 fl6;
1152
1153 memset(&fl6, 0, sizeof(fl6));
1154 fl6.flowi6_oif = oif;
1155 fl6.flowi6_mark = mark;
1156 fl6.flowi6_flags = 0;
1157 fl6.daddr = iph->daddr;
1158 fl6.saddr = iph->saddr;
1159 fl6.flowlabel = ip6_flowinfo(iph);
1160
1161 dst = ip6_route_output(net, NULL, &fl6);
1162 if (!dst->error)
1163 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1164 dst_release(dst);
1165 }
1166 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1167
1168 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1169 {
1170 ip6_update_pmtu(skb, sock_net(sk), mtu,
1171 sk->sk_bound_dev_if, sk->sk_mark);
1172 }
1173 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1174
1175 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1176 {
1177 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1178 struct dst_entry *dst;
1179 struct flowi6 fl6;
1180
1181 memset(&fl6, 0, sizeof(fl6));
1182 fl6.flowi6_oif = oif;
1183 fl6.flowi6_mark = mark;
1184 fl6.flowi6_flags = 0;
1185 fl6.daddr = iph->daddr;
1186 fl6.saddr = iph->saddr;
1187 fl6.flowlabel = ip6_flowinfo(iph);
1188
1189 dst = ip6_route_output(net, NULL, &fl6);
1190 if (!dst->error)
1191 rt6_do_redirect(dst, NULL, skb);
1192 dst_release(dst);
1193 }
1194 EXPORT_SYMBOL_GPL(ip6_redirect);
1195
1196 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1197 {
1198 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1199 }
1200 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1201
1202 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1203 {
1204 struct net_device *dev = dst->dev;
1205 unsigned int mtu = dst_mtu(dst);
1206 struct net *net = dev_net(dev);
1207
1208 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1209
1210 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1211 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1212
1213 /*
1214 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1215 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1216 * IPV6_MAXPLEN is also valid and means: "any MSS,
1217 * rely only on pmtu discovery"
1218 */
1219 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1220 mtu = IPV6_MAXPLEN;
1221 return mtu;
1222 }
1223
1224 static unsigned int ip6_mtu(const struct dst_entry *dst)
1225 {
1226 struct inet6_dev *idev;
1227 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1228
1229 if (mtu)
1230 return mtu;
1231
1232 mtu = IPV6_MIN_MTU;
1233
1234 rcu_read_lock();
1235 idev = __in6_dev_get(dst->dev);
1236 if (idev)
1237 mtu = idev->cnf.mtu6;
1238 rcu_read_unlock();
1239
1240 return mtu;
1241 }
1242
1243 static struct dst_entry *icmp6_dst_gc_list;
1244 static DEFINE_SPINLOCK(icmp6_dst_lock);
1245
1246 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1247 struct neighbour *neigh,
1248 struct flowi6 *fl6)
1249 {
1250 struct dst_entry *dst;
1251 struct rt6_info *rt;
1252 struct inet6_dev *idev = in6_dev_get(dev);
1253 struct net *net = dev_net(dev);
1254
1255 if (unlikely(!idev))
1256 return ERR_PTR(-ENODEV);
1257
1258 rt = ip6_dst_alloc(net, dev, 0, NULL);
1259 if (unlikely(!rt)) {
1260 in6_dev_put(idev);
1261 dst = ERR_PTR(-ENOMEM);
1262 goto out;
1263 }
1264
1265 if (neigh)
1266 neigh_hold(neigh);
1267 else {
1268 neigh = ip6_neigh_lookup(&rt->dst, NULL, &fl6->daddr);
1269 if (IS_ERR(neigh)) {
1270 in6_dev_put(idev);
1271 dst_free(&rt->dst);
1272 return ERR_CAST(neigh);
1273 }
1274 }
1275
1276 rt->dst.flags |= DST_HOST;
1277 rt->dst.output = ip6_output;
1278 rt->n = neigh;
1279 atomic_set(&rt->dst.__refcnt, 1);
1280 rt->rt6i_dst.addr = fl6->daddr;
1281 rt->rt6i_dst.plen = 128;
1282 rt->rt6i_idev = idev;
1283 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1284
1285 spin_lock_bh(&icmp6_dst_lock);
1286 rt->dst.next = icmp6_dst_gc_list;
1287 icmp6_dst_gc_list = &rt->dst;
1288 spin_unlock_bh(&icmp6_dst_lock);
1289
1290 fib6_force_start_gc(net);
1291
1292 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1293
1294 out:
1295 return dst;
1296 }
1297
1298 int icmp6_dst_gc(void)
1299 {
1300 struct dst_entry *dst, **pprev;
1301 int more = 0;
1302
1303 spin_lock_bh(&icmp6_dst_lock);
1304 pprev = &icmp6_dst_gc_list;
1305
1306 while ((dst = *pprev) != NULL) {
1307 if (!atomic_read(&dst->__refcnt)) {
1308 *pprev = dst->next;
1309 dst_free(dst);
1310 } else {
1311 pprev = &dst->next;
1312 ++more;
1313 }
1314 }
1315
1316 spin_unlock_bh(&icmp6_dst_lock);
1317
1318 return more;
1319 }
1320
1321 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1322 void *arg)
1323 {
1324 struct dst_entry *dst, **pprev;
1325
1326 spin_lock_bh(&icmp6_dst_lock);
1327 pprev = &icmp6_dst_gc_list;
1328 while ((dst = *pprev) != NULL) {
1329 struct rt6_info *rt = (struct rt6_info *) dst;
1330 if (func(rt, arg)) {
1331 *pprev = dst->next;
1332 dst_free(dst);
1333 } else {
1334 pprev = &dst->next;
1335 }
1336 }
1337 spin_unlock_bh(&icmp6_dst_lock);
1338 }
1339
1340 static int ip6_dst_gc(struct dst_ops *ops)
1341 {
1342 unsigned long now = jiffies;
1343 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1344 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1345 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1346 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1347 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1348 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1349 int entries;
1350
1351 entries = dst_entries_get_fast(ops);
1352 if (time_after(rt_last_gc + rt_min_interval, now) &&
1353 entries <= rt_max_size)
1354 goto out;
1355
1356 net->ipv6.ip6_rt_gc_expire++;
1357 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1358 net->ipv6.ip6_rt_last_gc = now;
1359 entries = dst_entries_get_slow(ops);
1360 if (entries < ops->gc_thresh)
1361 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1362 out:
1363 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1364 return entries > rt_max_size;
1365 }
1366
1367 int ip6_dst_hoplimit(struct dst_entry *dst)
1368 {
1369 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1370 if (hoplimit == 0) {
1371 struct net_device *dev = dst->dev;
1372 struct inet6_dev *idev;
1373
1374 rcu_read_lock();
1375 idev = __in6_dev_get(dev);
1376 if (idev)
1377 hoplimit = idev->cnf.hop_limit;
1378 else
1379 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1380 rcu_read_unlock();
1381 }
1382 return hoplimit;
1383 }
1384 EXPORT_SYMBOL(ip6_dst_hoplimit);
1385
1386 /*
1387 *
1388 */
1389
1390 int ip6_route_add(struct fib6_config *cfg)
1391 {
1392 int err;
1393 struct net *net = cfg->fc_nlinfo.nl_net;
1394 struct rt6_info *rt = NULL;
1395 struct net_device *dev = NULL;
1396 struct inet6_dev *idev = NULL;
1397 struct fib6_table *table;
1398 int addr_type;
1399
1400 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1401 return -EINVAL;
1402 #ifndef CONFIG_IPV6_SUBTREES
1403 if (cfg->fc_src_len)
1404 return -EINVAL;
1405 #endif
1406 if (cfg->fc_ifindex) {
1407 err = -ENODEV;
1408 dev = dev_get_by_index(net, cfg->fc_ifindex);
1409 if (!dev)
1410 goto out;
1411 idev = in6_dev_get(dev);
1412 if (!idev)
1413 goto out;
1414 }
1415
1416 if (cfg->fc_metric == 0)
1417 cfg->fc_metric = IP6_RT_PRIO_USER;
1418
1419 err = -ENOBUFS;
1420 if (cfg->fc_nlinfo.nlh &&
1421 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1422 table = fib6_get_table(net, cfg->fc_table);
1423 if (!table) {
1424 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1425 table = fib6_new_table(net, cfg->fc_table);
1426 }
1427 } else {
1428 table = fib6_new_table(net, cfg->fc_table);
1429 }
1430
1431 if (!table)
1432 goto out;
1433
1434 rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);
1435
1436 if (!rt) {
1437 err = -ENOMEM;
1438 goto out;
1439 }
1440
1441 if (cfg->fc_flags & RTF_EXPIRES)
1442 rt6_set_expires(rt, jiffies +
1443 clock_t_to_jiffies(cfg->fc_expires));
1444 else
1445 rt6_clean_expires(rt);
1446
1447 if (cfg->fc_protocol == RTPROT_UNSPEC)
1448 cfg->fc_protocol = RTPROT_BOOT;
1449 rt->rt6i_protocol = cfg->fc_protocol;
1450
1451 addr_type = ipv6_addr_type(&cfg->fc_dst);
1452
1453 if (addr_type & IPV6_ADDR_MULTICAST)
1454 rt->dst.input = ip6_mc_input;
1455 else if (cfg->fc_flags & RTF_LOCAL)
1456 rt->dst.input = ip6_input;
1457 else
1458 rt->dst.input = ip6_forward;
1459
1460 rt->dst.output = ip6_output;
1461
1462 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1463 rt->rt6i_dst.plen = cfg->fc_dst_len;
1464 if (rt->rt6i_dst.plen == 128)
1465 rt->dst.flags |= DST_HOST;
1466
1467 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1468 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1469 if (!metrics) {
1470 err = -ENOMEM;
1471 goto out;
1472 }
1473 dst_init_metrics(&rt->dst, metrics, 0);
1474 }
1475 #ifdef CONFIG_IPV6_SUBTREES
1476 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1477 rt->rt6i_src.plen = cfg->fc_src_len;
1478 #endif
1479
1480 rt->rt6i_metric = cfg->fc_metric;
1481
1482 /* We cannot add true routes via loopback here,
1483 they would result in kernel looping; promote them to reject routes
1484 */
1485 if ((cfg->fc_flags & RTF_REJECT) ||
1486 (dev && (dev->flags & IFF_LOOPBACK) &&
1487 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1488 !(cfg->fc_flags & RTF_LOCAL))) {
1489 /* hold loopback dev/idev if we haven't done so. */
1490 if (dev != net->loopback_dev) {
1491 if (dev) {
1492 dev_put(dev);
1493 in6_dev_put(idev);
1494 }
1495 dev = net->loopback_dev;
1496 dev_hold(dev);
1497 idev = in6_dev_get(dev);
1498 if (!idev) {
1499 err = -ENODEV;
1500 goto out;
1501 }
1502 }
1503 rt->dst.output = ip6_pkt_discard_out;
1504 rt->dst.input = ip6_pkt_discard;
1505 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1506 switch (cfg->fc_type) {
1507 case RTN_BLACKHOLE:
1508 rt->dst.error = -EINVAL;
1509 break;
1510 case RTN_PROHIBIT:
1511 rt->dst.error = -EACCES;
1512 break;
1513 case RTN_THROW:
1514 rt->dst.error = -EAGAIN;
1515 break;
1516 default:
1517 rt->dst.error = -ENETUNREACH;
1518 break;
1519 }
1520 goto install_route;
1521 }
1522
1523 if (cfg->fc_flags & RTF_GATEWAY) {
1524 const struct in6_addr *gw_addr;
1525 int gwa_type;
1526
1527 gw_addr = &cfg->fc_gateway;
1528 rt->rt6i_gateway = *gw_addr;
1529 gwa_type = ipv6_addr_type(gw_addr);
1530
1531 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1532 struct rt6_info *grt;
1533
1534 /* IPv6 strictly inhibits using not link-local
1535 addresses as nexthop address.
1536 Otherwise, router will not able to send redirects.
1537 It is very good, but in some (rare!) circumstances
1538 (SIT, PtP, NBMA NOARP links) it is handy to allow
1539 some exceptions. --ANK
1540 */
1541 err = -EINVAL;
1542 if (!(gwa_type & IPV6_ADDR_UNICAST))
1543 goto out;
1544
1545 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1546
1547 err = -EHOSTUNREACH;
1548 if (!grt)
1549 goto out;
1550 if (dev) {
1551 if (dev != grt->dst.dev) {
1552 ip6_rt_put(grt);
1553 goto out;
1554 }
1555 } else {
1556 dev = grt->dst.dev;
1557 idev = grt->rt6i_idev;
1558 dev_hold(dev);
1559 in6_dev_hold(grt->rt6i_idev);
1560 }
1561 if (!(grt->rt6i_flags & RTF_GATEWAY))
1562 err = 0;
1563 ip6_rt_put(grt);
1564
1565 if (err)
1566 goto out;
1567 }
1568 err = -EINVAL;
1569 if (!dev || (dev->flags & IFF_LOOPBACK))
1570 goto out;
1571 }
1572
1573 err = -ENODEV;
1574 if (!dev)
1575 goto out;
1576
1577 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1578 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1579 err = -EINVAL;
1580 goto out;
1581 }
1582 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1583 rt->rt6i_prefsrc.plen = 128;
1584 } else
1585 rt->rt6i_prefsrc.plen = 0;
1586
1587 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1588 err = rt6_bind_neighbour(rt, dev);
1589 if (err)
1590 goto out;
1591 }
1592
1593 rt->rt6i_flags = cfg->fc_flags;
1594
1595 install_route:
1596 if (cfg->fc_mx) {
1597 struct nlattr *nla;
1598 int remaining;
1599
1600 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1601 int type = nla_type(nla);
1602
1603 if (type) {
1604 if (type > RTAX_MAX) {
1605 err = -EINVAL;
1606 goto out;
1607 }
1608
1609 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1610 }
1611 }
1612 }
1613
1614 rt->dst.dev = dev;
1615 rt->rt6i_idev = idev;
1616 rt->rt6i_table = table;
1617
1618 cfg->fc_nlinfo.nl_net = dev_net(dev);
1619
1620 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1621
1622 out:
1623 if (dev)
1624 dev_put(dev);
1625 if (idev)
1626 in6_dev_put(idev);
1627 if (rt)
1628 dst_free(&rt->dst);
1629 return err;
1630 }
1631
1632 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1633 {
1634 int err;
1635 struct fib6_table *table;
1636 struct net *net = dev_net(rt->dst.dev);
1637
1638 if (rt == net->ipv6.ip6_null_entry) {
1639 err = -ENOENT;
1640 goto out;
1641 }
1642
1643 table = rt->rt6i_table;
1644 write_lock_bh(&table->tb6_lock);
1645 err = fib6_del(rt, info);
1646 write_unlock_bh(&table->tb6_lock);
1647
1648 out:
1649 ip6_rt_put(rt);
1650 return err;
1651 }
1652
1653 int ip6_del_rt(struct rt6_info *rt)
1654 {
1655 struct nl_info info = {
1656 .nl_net = dev_net(rt->dst.dev),
1657 };
1658 return __ip6_del_rt(rt, &info);
1659 }
1660
1661 static int ip6_route_del(struct fib6_config *cfg)
1662 {
1663 struct fib6_table *table;
1664 struct fib6_node *fn;
1665 struct rt6_info *rt;
1666 int err = -ESRCH;
1667
1668 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1669 if (!table)
1670 return err;
1671
1672 read_lock_bh(&table->tb6_lock);
1673
1674 fn = fib6_locate(&table->tb6_root,
1675 &cfg->fc_dst, cfg->fc_dst_len,
1676 &cfg->fc_src, cfg->fc_src_len);
1677
1678 if (fn) {
1679 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1680 if (cfg->fc_ifindex &&
1681 (!rt->dst.dev ||
1682 rt->dst.dev->ifindex != cfg->fc_ifindex))
1683 continue;
1684 if (cfg->fc_flags & RTF_GATEWAY &&
1685 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1686 continue;
1687 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1688 continue;
1689 dst_hold(&rt->dst);
1690 read_unlock_bh(&table->tb6_lock);
1691
1692 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1693 }
1694 }
1695 read_unlock_bh(&table->tb6_lock);
1696
1697 return err;
1698 }
1699
1700 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1701 {
1702 struct net *net = dev_net(skb->dev);
1703 struct netevent_redirect netevent;
1704 struct rt6_info *rt, *nrt = NULL;
1705 struct ndisc_options ndopts;
1706 struct neighbour *old_neigh;
1707 struct inet6_dev *in6_dev;
1708 struct neighbour *neigh;
1709 struct rd_msg *msg;
1710 int optlen, on_link;
1711 u8 *lladdr;
1712
1713 optlen = skb->tail - skb->transport_header;
1714 optlen -= sizeof(*msg);
1715
1716 if (optlen < 0) {
1717 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1718 return;
1719 }
1720
1721 msg = (struct rd_msg *)icmp6_hdr(skb);
1722
1723 if (ipv6_addr_is_multicast(&msg->dest)) {
1724 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1725 return;
1726 }
1727
1728 on_link = 0;
1729 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1730 on_link = 1;
1731 } else if (ipv6_addr_type(&msg->target) !=
1732 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1733 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1734 return;
1735 }
1736
1737 in6_dev = __in6_dev_get(skb->dev);
1738 if (!in6_dev)
1739 return;
1740 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1741 return;
1742
1743 /* RFC2461 8.1:
1744 * The IP source address of the Redirect MUST be the same as the current
1745 * first-hop router for the specified ICMP Destination Address.
1746 */
1747
1748 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1749 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1750 return;
1751 }
1752
1753 lladdr = NULL;
1754 if (ndopts.nd_opts_tgt_lladdr) {
1755 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1756 skb->dev);
1757 if (!lladdr) {
1758 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1759 return;
1760 }
1761 }
1762
1763 rt = (struct rt6_info *) dst;
1764 if (rt == net->ipv6.ip6_null_entry) {
1765 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1766 return;
1767 }
1768
1769 /* Redirect received -> path was valid.
1770 * Look, redirects are sent only in response to data packets,
1771 * so that this nexthop apparently is reachable. --ANK
1772 */
1773 dst_confirm(&rt->dst);
1774
1775 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1776 if (!neigh)
1777 return;
1778
1779 /* Duplicate redirect: silently ignore. */
1780 old_neigh = rt->n;
1781 if (neigh == old_neigh)
1782 goto out;
1783
1784 /*
1785 * We have finally decided to accept it.
1786 */
1787
1788 neigh_update(neigh, lladdr, NUD_STALE,
1789 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1790 NEIGH_UPDATE_F_OVERRIDE|
1791 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1792 NEIGH_UPDATE_F_ISROUTER))
1793 );
1794
1795 nrt = ip6_rt_copy(rt, &msg->dest);
1796 if (!nrt)
1797 goto out;
1798
1799 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1800 if (on_link)
1801 nrt->rt6i_flags &= ~RTF_GATEWAY;
1802
1803 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1804 nrt->n = neigh_clone(neigh);
1805
1806 if (ip6_ins_rt(nrt))
1807 goto out;
1808
1809 netevent.old = &rt->dst;
1810 netevent.new = &nrt->dst;
1811 netevent.daddr = &msg->dest;
1812 netevent.neigh = neigh;
1813 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1814
1815 if (rt->rt6i_flags & RTF_CACHE) {
1816 rt = (struct rt6_info *) dst_clone(&rt->dst);
1817 ip6_del_rt(rt);
1818 }
1819
1820 out:
1821 neigh_release(neigh);
1822 }
1823
1824 /*
1825 * Misc support functions
1826 */
1827
1828 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1829 const struct in6_addr *dest)
1830 {
1831 struct net *net = dev_net(ort->dst.dev);
1832 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1833 ort->rt6i_table);
1834
1835 if (rt) {
1836 rt->dst.input = ort->dst.input;
1837 rt->dst.output = ort->dst.output;
1838 rt->dst.flags |= DST_HOST;
1839
1840 rt->rt6i_dst.addr = *dest;
1841 rt->rt6i_dst.plen = 128;
1842 dst_copy_metrics(&rt->dst, &ort->dst);
1843 rt->dst.error = ort->dst.error;
1844 rt->rt6i_idev = ort->rt6i_idev;
1845 if (rt->rt6i_idev)
1846 in6_dev_hold(rt->rt6i_idev);
1847 rt->dst.lastuse = jiffies;
1848
1849 rt->rt6i_gateway = ort->rt6i_gateway;
1850 rt->rt6i_flags = ort->rt6i_flags;
1851 if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
1852 (RTF_DEFAULT | RTF_ADDRCONF))
1853 rt6_set_from(rt, ort);
1854 else
1855 rt6_clean_expires(rt);
1856 rt->rt6i_metric = 0;
1857
1858 #ifdef CONFIG_IPV6_SUBTREES
1859 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1860 #endif
1861 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1862 rt->rt6i_table = ort->rt6i_table;
1863 }
1864 return rt;
1865 }
1866
1867 #ifdef CONFIG_IPV6_ROUTE_INFO
1868 static struct rt6_info *rt6_get_route_info(struct net *net,
1869 const struct in6_addr *prefix, int prefixlen,
1870 const struct in6_addr *gwaddr, int ifindex)
1871 {
1872 struct fib6_node *fn;
1873 struct rt6_info *rt = NULL;
1874 struct fib6_table *table;
1875
1876 table = fib6_get_table(net, RT6_TABLE_INFO);
1877 if (!table)
1878 return NULL;
1879
1880 read_lock_bh(&table->tb6_lock);
1881 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1882 if (!fn)
1883 goto out;
1884
1885 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1886 if (rt->dst.dev->ifindex != ifindex)
1887 continue;
1888 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1889 continue;
1890 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1891 continue;
1892 dst_hold(&rt->dst);
1893 break;
1894 }
1895 out:
1896 read_unlock_bh(&table->tb6_lock);
1897 return rt;
1898 }
1899
1900 static struct rt6_info *rt6_add_route_info(struct net *net,
1901 const struct in6_addr *prefix, int prefixlen,
1902 const struct in6_addr *gwaddr, int ifindex,
1903 unsigned int pref)
1904 {
1905 struct fib6_config cfg = {
1906 .fc_table = RT6_TABLE_INFO,
1907 .fc_metric = IP6_RT_PRIO_USER,
1908 .fc_ifindex = ifindex,
1909 .fc_dst_len = prefixlen,
1910 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1911 RTF_UP | RTF_PREF(pref),
1912 .fc_nlinfo.portid = 0,
1913 .fc_nlinfo.nlh = NULL,
1914 .fc_nlinfo.nl_net = net,
1915 };
1916
1917 cfg.fc_dst = *prefix;
1918 cfg.fc_gateway = *gwaddr;
1919
1920 /* We should treat it as a default route if prefix length is 0. */
1921 if (!prefixlen)
1922 cfg.fc_flags |= RTF_DEFAULT;
1923
1924 ip6_route_add(&cfg);
1925
1926 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1927 }
1928 #endif
1929
1930 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1931 {
1932 struct rt6_info *rt;
1933 struct fib6_table *table;
1934
1935 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1936 if (!table)
1937 return NULL;
1938
1939 read_lock_bh(&table->tb6_lock);
1940 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1941 if (dev == rt->dst.dev &&
1942 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1943 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1944 break;
1945 }
1946 if (rt)
1947 dst_hold(&rt->dst);
1948 read_unlock_bh(&table->tb6_lock);
1949 return rt;
1950 }
1951
1952 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1953 struct net_device *dev,
1954 unsigned int pref)
1955 {
1956 struct fib6_config cfg = {
1957 .fc_table = RT6_TABLE_DFLT,
1958 .fc_metric = IP6_RT_PRIO_USER,
1959 .fc_ifindex = dev->ifindex,
1960 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1961 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1962 .fc_nlinfo.portid = 0,
1963 .fc_nlinfo.nlh = NULL,
1964 .fc_nlinfo.nl_net = dev_net(dev),
1965 };
1966
1967 cfg.fc_gateway = *gwaddr;
1968
1969 ip6_route_add(&cfg);
1970
1971 return rt6_get_dflt_router(gwaddr, dev);
1972 }
1973
1974 void rt6_purge_dflt_routers(struct net *net)
1975 {
1976 struct rt6_info *rt;
1977 struct fib6_table *table;
1978
1979 /* NOTE: Keep consistent with rt6_get_dflt_router */
1980 table = fib6_get_table(net, RT6_TABLE_DFLT);
1981 if (!table)
1982 return;
1983
1984 restart:
1985 read_lock_bh(&table->tb6_lock);
1986 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1987 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1988 dst_hold(&rt->dst);
1989 read_unlock_bh(&table->tb6_lock);
1990 ip6_del_rt(rt);
1991 goto restart;
1992 }
1993 }
1994 read_unlock_bh(&table->tb6_lock);
1995 }
1996
1997 static void rtmsg_to_fib6_config(struct net *net,
1998 struct in6_rtmsg *rtmsg,
1999 struct fib6_config *cfg)
2000 {
2001 memset(cfg, 0, sizeof(*cfg));
2002
2003 cfg->fc_table = RT6_TABLE_MAIN;
2004 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2005 cfg->fc_metric = rtmsg->rtmsg_metric;
2006 cfg->fc_expires = rtmsg->rtmsg_info;
2007 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2008 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2009 cfg->fc_flags = rtmsg->rtmsg_flags;
2010
2011 cfg->fc_nlinfo.nl_net = net;
2012
2013 cfg->fc_dst = rtmsg->rtmsg_dst;
2014 cfg->fc_src = rtmsg->rtmsg_src;
2015 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2016 }
2017
2018 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2019 {
2020 struct fib6_config cfg;
2021 struct in6_rtmsg rtmsg;
2022 int err;
2023
2024 switch(cmd) {
2025 case SIOCADDRT: /* Add a route */
2026 case SIOCDELRT: /* Delete a route */
2027 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2028 return -EPERM;
2029 err = copy_from_user(&rtmsg, arg,
2030 sizeof(struct in6_rtmsg));
2031 if (err)
2032 return -EFAULT;
2033
2034 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2035
2036 rtnl_lock();
2037 switch (cmd) {
2038 case SIOCADDRT:
2039 err = ip6_route_add(&cfg);
2040 break;
2041 case SIOCDELRT:
2042 err = ip6_route_del(&cfg);
2043 break;
2044 default:
2045 err = -EINVAL;
2046 }
2047 rtnl_unlock();
2048
2049 return err;
2050 }
2051
2052 return -EINVAL;
2053 }
2054
2055 /*
2056 * Drop the packet on the floor
2057 */
2058
2059 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2060 {
2061 int type;
2062 struct dst_entry *dst = skb_dst(skb);
2063 switch (ipstats_mib_noroutes) {
2064 case IPSTATS_MIB_INNOROUTES:
2065 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2066 if (type == IPV6_ADDR_ANY) {
2067 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2068 IPSTATS_MIB_INADDRERRORS);
2069 break;
2070 }
2071 /* FALLTHROUGH */
2072 case IPSTATS_MIB_OUTNOROUTES:
2073 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2074 ipstats_mib_noroutes);
2075 break;
2076 }
2077 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2078 kfree_skb(skb);
2079 return 0;
2080 }
2081
2082 static int ip6_pkt_discard(struct sk_buff *skb)
2083 {
2084 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2085 }
2086
2087 static int ip6_pkt_discard_out(struct sk_buff *skb)
2088 {
2089 skb->dev = skb_dst(skb)->dev;
2090 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2091 }
2092
2093 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2094
2095 static int ip6_pkt_prohibit(struct sk_buff *skb)
2096 {
2097 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2098 }
2099
2100 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2101 {
2102 skb->dev = skb_dst(skb)->dev;
2103 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2104 }
2105
2106 #endif
2107
2108 /*
2109 * Allocate a dst for local (unicast / anycast) address.
2110 */
2111
2112 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2113 const struct in6_addr *addr,
2114 bool anycast)
2115 {
2116 struct net *net = dev_net(idev->dev);
2117 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL);
2118 int err;
2119
2120 if (!rt) {
2121 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
2122 return ERR_PTR(-ENOMEM);
2123 }
2124
2125 in6_dev_hold(idev);
2126
2127 rt->dst.flags |= DST_HOST;
2128 rt->dst.input = ip6_input;
2129 rt->dst.output = ip6_output;
2130 rt->rt6i_idev = idev;
2131
2132 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2133 if (anycast)
2134 rt->rt6i_flags |= RTF_ANYCAST;
2135 else
2136 rt->rt6i_flags |= RTF_LOCAL;
2137 err = rt6_bind_neighbour(rt, rt->dst.dev);
2138 if (err) {
2139 dst_free(&rt->dst);
2140 return ERR_PTR(err);
2141 }
2142
2143 rt->rt6i_dst.addr = *addr;
2144 rt->rt6i_dst.plen = 128;
2145 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2146
2147 atomic_set(&rt->dst.__refcnt, 1);
2148
2149 return rt;
2150 }
2151
2152 int ip6_route_get_saddr(struct net *net,
2153 struct rt6_info *rt,
2154 const struct in6_addr *daddr,
2155 unsigned int prefs,
2156 struct in6_addr *saddr)
2157 {
2158 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2159 int err = 0;
2160 if (rt->rt6i_prefsrc.plen)
2161 *saddr = rt->rt6i_prefsrc.addr;
2162 else
2163 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2164 daddr, prefs, saddr);
2165 return err;
2166 }
2167
2168 /* remove deleted ip from prefsrc entries */
2169 struct arg_dev_net_ip {
2170 struct net_device *dev;
2171 struct net *net;
2172 struct in6_addr *addr;
2173 };
2174
2175 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2176 {
2177 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2178 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2179 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2180
2181 if (((void *)rt->dst.dev == dev || !dev) &&
2182 rt != net->ipv6.ip6_null_entry &&
2183 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2184 /* remove prefsrc entry */
2185 rt->rt6i_prefsrc.plen = 0;
2186 }
2187 return 0;
2188 }
2189
2190 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2191 {
2192 struct net *net = dev_net(ifp->idev->dev);
2193 struct arg_dev_net_ip adni = {
2194 .dev = ifp->idev->dev,
2195 .net = net,
2196 .addr = &ifp->addr,
2197 };
2198 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2199 }
2200
2201 struct arg_dev_net {
2202 struct net_device *dev;
2203 struct net *net;
2204 };
2205
2206 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2207 {
2208 const struct arg_dev_net *adn = arg;
2209 const struct net_device *dev = adn->dev;
2210
2211 if ((rt->dst.dev == dev || !dev) &&
2212 rt != adn->net->ipv6.ip6_null_entry)
2213 return -1;
2214
2215 return 0;
2216 }
2217
2218 void rt6_ifdown(struct net *net, struct net_device *dev)
2219 {
2220 struct arg_dev_net adn = {
2221 .dev = dev,
2222 .net = net,
2223 };
2224
2225 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2226 icmp6_clean_all(fib6_ifdown, &adn);
2227 }
2228
2229 struct rt6_mtu_change_arg {
2230 struct net_device *dev;
2231 unsigned int mtu;
2232 };
2233
2234 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2235 {
2236 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2237 struct inet6_dev *idev;
2238
2239 /* In IPv6 pmtu discovery is not optional,
2240 so that RTAX_MTU lock cannot disable it.
2241 We still use this lock to block changes
2242 caused by addrconf/ndisc.
2243 */
2244
2245 idev = __in6_dev_get(arg->dev);
2246 if (!idev)
2247 return 0;
2248
2249 /* For administrative MTU increase, there is no way to discover
2250 IPv6 PMTU increase, so PMTU increase should be updated here.
2251 Since RFC 1981 doesn't include administrative MTU increase
2252 update PMTU increase is a MUST. (i.e. jumbo frame)
2253 */
2254 /*
2255 If new MTU is less than route PMTU, this new MTU will be the
2256 lowest MTU in the path, update the route PMTU to reflect PMTU
2257 decreases; if new MTU is greater than route PMTU, and the
2258 old MTU is the lowest MTU in the path, update the route PMTU
2259 to reflect the increase. In this case if the other nodes' MTU
2260 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2261 PMTU discouvery.
2262 */
2263 if (rt->dst.dev == arg->dev &&
2264 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2265 (dst_mtu(&rt->dst) >= arg->mtu ||
2266 (dst_mtu(&rt->dst) < arg->mtu &&
2267 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2268 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2269 }
2270 return 0;
2271 }
2272
2273 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2274 {
2275 struct rt6_mtu_change_arg arg = {
2276 .dev = dev,
2277 .mtu = mtu,
2278 };
2279
2280 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2281 }
2282
2283 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2284 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2285 [RTA_OIF] = { .type = NLA_U32 },
2286 [RTA_IIF] = { .type = NLA_U32 },
2287 [RTA_PRIORITY] = { .type = NLA_U32 },
2288 [RTA_METRICS] = { .type = NLA_NESTED },
2289 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2290 };
2291
2292 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2293 struct fib6_config *cfg)
2294 {
2295 struct rtmsg *rtm;
2296 struct nlattr *tb[RTA_MAX+1];
2297 int err;
2298
2299 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2300 if (err < 0)
2301 goto errout;
2302
2303 err = -EINVAL;
2304 rtm = nlmsg_data(nlh);
2305 memset(cfg, 0, sizeof(*cfg));
2306
2307 cfg->fc_table = rtm->rtm_table;
2308 cfg->fc_dst_len = rtm->rtm_dst_len;
2309 cfg->fc_src_len = rtm->rtm_src_len;
2310 cfg->fc_flags = RTF_UP;
2311 cfg->fc_protocol = rtm->rtm_protocol;
2312 cfg->fc_type = rtm->rtm_type;
2313
2314 if (rtm->rtm_type == RTN_UNREACHABLE ||
2315 rtm->rtm_type == RTN_BLACKHOLE ||
2316 rtm->rtm_type == RTN_PROHIBIT ||
2317 rtm->rtm_type == RTN_THROW)
2318 cfg->fc_flags |= RTF_REJECT;
2319
2320 if (rtm->rtm_type == RTN_LOCAL)
2321 cfg->fc_flags |= RTF_LOCAL;
2322
2323 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2324 cfg->fc_nlinfo.nlh = nlh;
2325 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2326
2327 if (tb[RTA_GATEWAY]) {
2328 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2329 cfg->fc_flags |= RTF_GATEWAY;
2330 }
2331
2332 if (tb[RTA_DST]) {
2333 int plen = (rtm->rtm_dst_len + 7) >> 3;
2334
2335 if (nla_len(tb[RTA_DST]) < plen)
2336 goto errout;
2337
2338 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2339 }
2340
2341 if (tb[RTA_SRC]) {
2342 int plen = (rtm->rtm_src_len + 7) >> 3;
2343
2344 if (nla_len(tb[RTA_SRC]) < plen)
2345 goto errout;
2346
2347 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2348 }
2349
2350 if (tb[RTA_PREFSRC])
2351 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2352
2353 if (tb[RTA_OIF])
2354 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2355
2356 if (tb[RTA_PRIORITY])
2357 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2358
2359 if (tb[RTA_METRICS]) {
2360 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2361 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2362 }
2363
2364 if (tb[RTA_TABLE])
2365 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2366
2367 if (tb[RTA_MULTIPATH]) {
2368 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2369 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2370 }
2371
2372 err = 0;
2373 errout:
2374 return err;
2375 }
2376
2377 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2378 {
2379 struct fib6_config r_cfg;
2380 struct rtnexthop *rtnh;
2381 int remaining;
2382 int attrlen;
2383 int err = 0, last_err = 0;
2384
2385 beginning:
2386 rtnh = (struct rtnexthop *)cfg->fc_mp;
2387 remaining = cfg->fc_mp_len;
2388
2389 /* Parse a Multipath Entry */
2390 while (rtnh_ok(rtnh, remaining)) {
2391 memcpy(&r_cfg, cfg, sizeof(*cfg));
2392 if (rtnh->rtnh_ifindex)
2393 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2394
2395 attrlen = rtnh_attrlen(rtnh);
2396 if (attrlen > 0) {
2397 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2398
2399 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2400 if (nla) {
2401 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2402 r_cfg.fc_flags |= RTF_GATEWAY;
2403 }
2404 }
2405 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2406 if (err) {
2407 last_err = err;
2408 /* If we are trying to remove a route, do not stop the
2409 * loop when ip6_route_del() fails (because next hop is
2410 * already gone), we should try to remove all next hops.
2411 */
2412 if (add) {
2413 /* If add fails, we should try to delete all
2414 * next hops that have been already added.
2415 */
2416 add = 0;
2417 goto beginning;
2418 }
2419 }
2420 /* Because each route is added like a single route we remove
2421 * this flag after the first nexthop (if there is a collision,
2422 * we have already fail to add the first nexthop:
2423 * fib6_add_rt2node() has reject it).
2424 */
2425 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2426 rtnh = rtnh_next(rtnh, &remaining);
2427 }
2428
2429 return last_err;
2430 }
2431
2432 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2433 {
2434 struct fib6_config cfg;
2435 int err;
2436
2437 err = rtm_to_fib6_config(skb, nlh, &cfg);
2438 if (err < 0)
2439 return err;
2440
2441 if (cfg.fc_mp)
2442 return ip6_route_multipath(&cfg, 0);
2443 else
2444 return ip6_route_del(&cfg);
2445 }
2446
2447 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2448 {
2449 struct fib6_config cfg;
2450 int err;
2451
2452 err = rtm_to_fib6_config(skb, nlh, &cfg);
2453 if (err < 0)
2454 return err;
2455
2456 if (cfg.fc_mp)
2457 return ip6_route_multipath(&cfg, 1);
2458 else
2459 return ip6_route_add(&cfg);
2460 }
2461
2462 static inline size_t rt6_nlmsg_size(void)
2463 {
2464 return NLMSG_ALIGN(sizeof(struct rtmsg))
2465 + nla_total_size(16) /* RTA_SRC */
2466 + nla_total_size(16) /* RTA_DST */
2467 + nla_total_size(16) /* RTA_GATEWAY */
2468 + nla_total_size(16) /* RTA_PREFSRC */
2469 + nla_total_size(4) /* RTA_TABLE */
2470 + nla_total_size(4) /* RTA_IIF */
2471 + nla_total_size(4) /* RTA_OIF */
2472 + nla_total_size(4) /* RTA_PRIORITY */
2473 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2474 + nla_total_size(sizeof(struct rta_cacheinfo));
2475 }
2476
2477 static int rt6_fill_node(struct net *net,
2478 struct sk_buff *skb, struct rt6_info *rt,
2479 struct in6_addr *dst, struct in6_addr *src,
2480 int iif, int type, u32 portid, u32 seq,
2481 int prefix, int nowait, unsigned int flags)
2482 {
2483 struct rtmsg *rtm;
2484 struct nlmsghdr *nlh;
2485 long expires;
2486 u32 table;
2487
2488 if (prefix) { /* user wants prefix routes only */
2489 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2490 /* success since this is not a prefix route */
2491 return 1;
2492 }
2493 }
2494
2495 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2496 if (!nlh)
2497 return -EMSGSIZE;
2498
2499 rtm = nlmsg_data(nlh);
2500 rtm->rtm_family = AF_INET6;
2501 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2502 rtm->rtm_src_len = rt->rt6i_src.plen;
2503 rtm->rtm_tos = 0;
2504 if (rt->rt6i_table)
2505 table = rt->rt6i_table->tb6_id;
2506 else
2507 table = RT6_TABLE_UNSPEC;
2508 rtm->rtm_table = table;
2509 if (nla_put_u32(skb, RTA_TABLE, table))
2510 goto nla_put_failure;
2511 if (rt->rt6i_flags & RTF_REJECT) {
2512 switch (rt->dst.error) {
2513 case -EINVAL:
2514 rtm->rtm_type = RTN_BLACKHOLE;
2515 break;
2516 case -EACCES:
2517 rtm->rtm_type = RTN_PROHIBIT;
2518 break;
2519 case -EAGAIN:
2520 rtm->rtm_type = RTN_THROW;
2521 break;
2522 default:
2523 rtm->rtm_type = RTN_UNREACHABLE;
2524 break;
2525 }
2526 }
2527 else if (rt->rt6i_flags & RTF_LOCAL)
2528 rtm->rtm_type = RTN_LOCAL;
2529 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2530 rtm->rtm_type = RTN_LOCAL;
2531 else
2532 rtm->rtm_type = RTN_UNICAST;
2533 rtm->rtm_flags = 0;
2534 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2535 rtm->rtm_protocol = rt->rt6i_protocol;
2536 if (rt->rt6i_flags & RTF_DYNAMIC)
2537 rtm->rtm_protocol = RTPROT_REDIRECT;
2538 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2539 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2540 rtm->rtm_protocol = RTPROT_RA;
2541 else
2542 rtm->rtm_protocol = RTPROT_KERNEL;
2543 }
2544
2545 if (rt->rt6i_flags & RTF_CACHE)
2546 rtm->rtm_flags |= RTM_F_CLONED;
2547
2548 if (dst) {
2549 if (nla_put(skb, RTA_DST, 16, dst))
2550 goto nla_put_failure;
2551 rtm->rtm_dst_len = 128;
2552 } else if (rtm->rtm_dst_len)
2553 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2554 goto nla_put_failure;
2555 #ifdef CONFIG_IPV6_SUBTREES
2556 if (src) {
2557 if (nla_put(skb, RTA_SRC, 16, src))
2558 goto nla_put_failure;
2559 rtm->rtm_src_len = 128;
2560 } else if (rtm->rtm_src_len &&
2561 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2562 goto nla_put_failure;
2563 #endif
2564 if (iif) {
2565 #ifdef CONFIG_IPV6_MROUTE
2566 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2567 int err = ip6mr_get_route(net, skb, rtm, nowait);
2568 if (err <= 0) {
2569 if (!nowait) {
2570 if (err == 0)
2571 return 0;
2572 goto nla_put_failure;
2573 } else {
2574 if (err == -EMSGSIZE)
2575 goto nla_put_failure;
2576 }
2577 }
2578 } else
2579 #endif
2580 if (nla_put_u32(skb, RTA_IIF, iif))
2581 goto nla_put_failure;
2582 } else if (dst) {
2583 struct in6_addr saddr_buf;
2584 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2585 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2586 goto nla_put_failure;
2587 }
2588
2589 if (rt->rt6i_prefsrc.plen) {
2590 struct in6_addr saddr_buf;
2591 saddr_buf = rt->rt6i_prefsrc.addr;
2592 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2593 goto nla_put_failure;
2594 }
2595
2596 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2597 goto nla_put_failure;
2598
2599 if (rt->rt6i_flags & RTF_GATEWAY) {
2600 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2601 goto nla_put_failure;
2602 }
2603
2604 if (rt->dst.dev &&
2605 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2606 goto nla_put_failure;
2607 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2608 goto nla_put_failure;
2609
2610 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2611
2612 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2613 goto nla_put_failure;
2614
2615 return nlmsg_end(skb, nlh);
2616
2617 nla_put_failure:
2618 nlmsg_cancel(skb, nlh);
2619 return -EMSGSIZE;
2620 }
2621
2622 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2623 {
2624 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2625 int prefix;
2626
2627 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2628 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2629 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2630 } else
2631 prefix = 0;
2632
2633 return rt6_fill_node(arg->net,
2634 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2635 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2636 prefix, 0, NLM_F_MULTI);
2637 }
2638
2639 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2640 {
2641 struct net *net = sock_net(in_skb->sk);
2642 struct nlattr *tb[RTA_MAX+1];
2643 struct rt6_info *rt;
2644 struct sk_buff *skb;
2645 struct rtmsg *rtm;
2646 struct flowi6 fl6;
2647 int err, iif = 0, oif = 0;
2648
2649 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2650 if (err < 0)
2651 goto errout;
2652
2653 err = -EINVAL;
2654 memset(&fl6, 0, sizeof(fl6));
2655
2656 if (tb[RTA_SRC]) {
2657 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2658 goto errout;
2659
2660 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2661 }
2662
2663 if (tb[RTA_DST]) {
2664 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2665 goto errout;
2666
2667 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2668 }
2669
2670 if (tb[RTA_IIF])
2671 iif = nla_get_u32(tb[RTA_IIF]);
2672
2673 if (tb[RTA_OIF])
2674 oif = nla_get_u32(tb[RTA_OIF]);
2675
2676 if (iif) {
2677 struct net_device *dev;
2678 int flags = 0;
2679
2680 dev = __dev_get_by_index(net, iif);
2681 if (!dev) {
2682 err = -ENODEV;
2683 goto errout;
2684 }
2685
2686 fl6.flowi6_iif = iif;
2687
2688 if (!ipv6_addr_any(&fl6.saddr))
2689 flags |= RT6_LOOKUP_F_HAS_SADDR;
2690
2691 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2692 flags);
2693 } else {
2694 fl6.flowi6_oif = oif;
2695
2696 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2697 }
2698
2699 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2700 if (!skb) {
2701 ip6_rt_put(rt);
2702 err = -ENOBUFS;
2703 goto errout;
2704 }
2705
2706 /* Reserve room for dummy headers, this skb can pass
2707 through good chunk of routing engine.
2708 */
2709 skb_reset_mac_header(skb);
2710 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2711
2712 skb_dst_set(skb, &rt->dst);
2713
2714 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2715 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2716 nlh->nlmsg_seq, 0, 0, 0);
2717 if (err < 0) {
2718 kfree_skb(skb);
2719 goto errout;
2720 }
2721
2722 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2723 errout:
2724 return err;
2725 }
2726
2727 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2728 {
2729 struct sk_buff *skb;
2730 struct net *net = info->nl_net;
2731 u32 seq;
2732 int err;
2733
2734 err = -ENOBUFS;
2735 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2736
2737 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2738 if (!skb)
2739 goto errout;
2740
2741 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2742 event, info->portid, seq, 0, 0, 0);
2743 if (err < 0) {
2744 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2745 WARN_ON(err == -EMSGSIZE);
2746 kfree_skb(skb);
2747 goto errout;
2748 }
2749 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2750 info->nlh, gfp_any());
2751 return;
2752 errout:
2753 if (err < 0)
2754 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2755 }
2756
2757 static int ip6_route_dev_notify(struct notifier_block *this,
2758 unsigned long event, void *data)
2759 {
2760 struct net_device *dev = (struct net_device *)data;
2761 struct net *net = dev_net(dev);
2762
2763 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2764 net->ipv6.ip6_null_entry->dst.dev = dev;
2765 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2766 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2767 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2768 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2769 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2770 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2771 #endif
2772 }
2773
2774 return NOTIFY_OK;
2775 }
2776
2777 /*
2778 * /proc
2779 */
2780
2781 #ifdef CONFIG_PROC_FS
2782
2783 struct rt6_proc_arg
2784 {
2785 char *buffer;
2786 int offset;
2787 int length;
2788 int skip;
2789 int len;
2790 };
2791
2792 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2793 {
2794 struct seq_file *m = p_arg;
2795
2796 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2797
2798 #ifdef CONFIG_IPV6_SUBTREES
2799 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2800 #else
2801 seq_puts(m, "00000000000000000000000000000000 00 ");
2802 #endif
2803 if (rt->rt6i_flags & RTF_GATEWAY) {
2804 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2805 } else {
2806 seq_puts(m, "00000000000000000000000000000000");
2807 }
2808 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2809 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2810 rt->dst.__use, rt->rt6i_flags,
2811 rt->dst.dev ? rt->dst.dev->name : "");
2812 return 0;
2813 }
2814
2815 static int ipv6_route_show(struct seq_file *m, void *v)
2816 {
2817 struct net *net = (struct net *)m->private;
2818 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2819 return 0;
2820 }
2821
2822 static int ipv6_route_open(struct inode *inode, struct file *file)
2823 {
2824 return single_open_net(inode, file, ipv6_route_show);
2825 }
2826
2827 static const struct file_operations ipv6_route_proc_fops = {
2828 .owner = THIS_MODULE,
2829 .open = ipv6_route_open,
2830 .read = seq_read,
2831 .llseek = seq_lseek,
2832 .release = single_release_net,
2833 };
2834
2835 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2836 {
2837 struct net *net = (struct net *)seq->private;
2838 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2839 net->ipv6.rt6_stats->fib_nodes,
2840 net->ipv6.rt6_stats->fib_route_nodes,
2841 net->ipv6.rt6_stats->fib_rt_alloc,
2842 net->ipv6.rt6_stats->fib_rt_entries,
2843 net->ipv6.rt6_stats->fib_rt_cache,
2844 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2845 net->ipv6.rt6_stats->fib_discarded_routes);
2846
2847 return 0;
2848 }
2849
2850 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2851 {
2852 return single_open_net(inode, file, rt6_stats_seq_show);
2853 }
2854
2855 static const struct file_operations rt6_stats_seq_fops = {
2856 .owner = THIS_MODULE,
2857 .open = rt6_stats_seq_open,
2858 .read = seq_read,
2859 .llseek = seq_lseek,
2860 .release = single_release_net,
2861 };
2862 #endif /* CONFIG_PROC_FS */
2863
2864 #ifdef CONFIG_SYSCTL
2865
2866 static
2867 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2868 void __user *buffer, size_t *lenp, loff_t *ppos)
2869 {
2870 struct net *net;
2871 int delay;
2872 if (!write)
2873 return -EINVAL;
2874
2875 net = (struct net *)ctl->extra1;
2876 delay = net->ipv6.sysctl.flush_delay;
2877 proc_dointvec(ctl, write, buffer, lenp, ppos);
2878 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2879 return 0;
2880 }
2881
2882 ctl_table ipv6_route_table_template[] = {
2883 {
2884 .procname = "flush",
2885 .data = &init_net.ipv6.sysctl.flush_delay,
2886 .maxlen = sizeof(int),
2887 .mode = 0200,
2888 .proc_handler = ipv6_sysctl_rtcache_flush
2889 },
2890 {
2891 .procname = "gc_thresh",
2892 .data = &ip6_dst_ops_template.gc_thresh,
2893 .maxlen = sizeof(int),
2894 .mode = 0644,
2895 .proc_handler = proc_dointvec,
2896 },
2897 {
2898 .procname = "max_size",
2899 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2900 .maxlen = sizeof(int),
2901 .mode = 0644,
2902 .proc_handler = proc_dointvec,
2903 },
2904 {
2905 .procname = "gc_min_interval",
2906 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2907 .maxlen = sizeof(int),
2908 .mode = 0644,
2909 .proc_handler = proc_dointvec_jiffies,
2910 },
2911 {
2912 .procname = "gc_timeout",
2913 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2914 .maxlen = sizeof(int),
2915 .mode = 0644,
2916 .proc_handler = proc_dointvec_jiffies,
2917 },
2918 {
2919 .procname = "gc_interval",
2920 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2921 .maxlen = sizeof(int),
2922 .mode = 0644,
2923 .proc_handler = proc_dointvec_jiffies,
2924 },
2925 {
2926 .procname = "gc_elasticity",
2927 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2928 .maxlen = sizeof(int),
2929 .mode = 0644,
2930 .proc_handler = proc_dointvec,
2931 },
2932 {
2933 .procname = "mtu_expires",
2934 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2935 .maxlen = sizeof(int),
2936 .mode = 0644,
2937 .proc_handler = proc_dointvec_jiffies,
2938 },
2939 {
2940 .procname = "min_adv_mss",
2941 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2942 .maxlen = sizeof(int),
2943 .mode = 0644,
2944 .proc_handler = proc_dointvec,
2945 },
2946 {
2947 .procname = "gc_min_interval_ms",
2948 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2949 .maxlen = sizeof(int),
2950 .mode = 0644,
2951 .proc_handler = proc_dointvec_ms_jiffies,
2952 },
2953 { }
2954 };
2955
2956 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2957 {
2958 struct ctl_table *table;
2959
2960 table = kmemdup(ipv6_route_table_template,
2961 sizeof(ipv6_route_table_template),
2962 GFP_KERNEL);
2963
2964 if (table) {
2965 table[0].data = &net->ipv6.sysctl.flush_delay;
2966 table[0].extra1 = net;
2967 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2968 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2969 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2970 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2971 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2972 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2973 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2974 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2975 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2976
2977 /* Don't export sysctls to unprivileged users */
2978 if (net->user_ns != &init_user_ns)
2979 table[0].procname = NULL;
2980 }
2981
2982 return table;
2983 }
2984 #endif
2985
2986 static int __net_init ip6_route_net_init(struct net *net)
2987 {
2988 int ret = -ENOMEM;
2989
2990 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2991 sizeof(net->ipv6.ip6_dst_ops));
2992
2993 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2994 goto out_ip6_dst_ops;
2995
2996 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2997 sizeof(*net->ipv6.ip6_null_entry),
2998 GFP_KERNEL);
2999 if (!net->ipv6.ip6_null_entry)
3000 goto out_ip6_dst_entries;
3001 net->ipv6.ip6_null_entry->dst.path =
3002 (struct dst_entry *)net->ipv6.ip6_null_entry;
3003 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3004 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3005 ip6_template_metrics, true);
3006
3007 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3008 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3009 sizeof(*net->ipv6.ip6_prohibit_entry),
3010 GFP_KERNEL);
3011 if (!net->ipv6.ip6_prohibit_entry)
3012 goto out_ip6_null_entry;
3013 net->ipv6.ip6_prohibit_entry->dst.path =
3014 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3015 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3016 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3017 ip6_template_metrics, true);
3018
3019 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3020 sizeof(*net->ipv6.ip6_blk_hole_entry),
3021 GFP_KERNEL);
3022 if (!net->ipv6.ip6_blk_hole_entry)
3023 goto out_ip6_prohibit_entry;
3024 net->ipv6.ip6_blk_hole_entry->dst.path =
3025 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3026 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3027 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3028 ip6_template_metrics, true);
3029 #endif
3030
3031 net->ipv6.sysctl.flush_delay = 0;
3032 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3033 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3034 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3035 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3036 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3037 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3038 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3039
3040 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3041
3042 ret = 0;
3043 out:
3044 return ret;
3045
3046 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3047 out_ip6_prohibit_entry:
3048 kfree(net->ipv6.ip6_prohibit_entry);
3049 out_ip6_null_entry:
3050 kfree(net->ipv6.ip6_null_entry);
3051 #endif
3052 out_ip6_dst_entries:
3053 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3054 out_ip6_dst_ops:
3055 goto out;
3056 }
3057
3058 static void __net_exit ip6_route_net_exit(struct net *net)
3059 {
3060 kfree(net->ipv6.ip6_null_entry);
3061 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3062 kfree(net->ipv6.ip6_prohibit_entry);
3063 kfree(net->ipv6.ip6_blk_hole_entry);
3064 #endif
3065 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3066 }
3067
3068 static int __net_init ip6_route_net_init_late(struct net *net)
3069 {
3070 #ifdef CONFIG_PROC_FS
3071 proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
3072 proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
3073 #endif
3074 return 0;
3075 }
3076
3077 static void __net_exit ip6_route_net_exit_late(struct net *net)
3078 {
3079 #ifdef CONFIG_PROC_FS
3080 proc_net_remove(net, "ipv6_route");
3081 proc_net_remove(net, "rt6_stats");
3082 #endif
3083 }
3084
3085 static struct pernet_operations ip6_route_net_ops = {
3086 .init = ip6_route_net_init,
3087 .exit = ip6_route_net_exit,
3088 };
3089
3090 static int __net_init ipv6_inetpeer_init(struct net *net)
3091 {
3092 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3093
3094 if (!bp)
3095 return -ENOMEM;
3096 inet_peer_base_init(bp);
3097 net->ipv6.peers = bp;
3098 return 0;
3099 }
3100
3101 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3102 {
3103 struct inet_peer_base *bp = net->ipv6.peers;
3104
3105 net->ipv6.peers = NULL;
3106 inetpeer_invalidate_tree(bp);
3107 kfree(bp);
3108 }
3109
3110 static struct pernet_operations ipv6_inetpeer_ops = {
3111 .init = ipv6_inetpeer_init,
3112 .exit = ipv6_inetpeer_exit,
3113 };
3114
3115 static struct pernet_operations ip6_route_net_late_ops = {
3116 .init = ip6_route_net_init_late,
3117 .exit = ip6_route_net_exit_late,
3118 };
3119
3120 static struct notifier_block ip6_route_dev_notifier = {
3121 .notifier_call = ip6_route_dev_notify,
3122 .priority = 0,
3123 };
3124
3125 int __init ip6_route_init(void)
3126 {
3127 int ret;
3128
3129 ret = -ENOMEM;
3130 ip6_dst_ops_template.kmem_cachep =
3131 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3132 SLAB_HWCACHE_ALIGN, NULL);
3133 if (!ip6_dst_ops_template.kmem_cachep)
3134 goto out;
3135
3136 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3137 if (ret)
3138 goto out_kmem_cache;
3139
3140 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3141 if (ret)
3142 goto out_dst_entries;
3143
3144 ret = register_pernet_subsys(&ip6_route_net_ops);
3145 if (ret)
3146 goto out_register_inetpeer;
3147
3148 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3149
3150 /* Registering of the loopback is done before this portion of code,
3151 * the loopback reference in rt6_info will not be taken, do it
3152 * manually for init_net */
3153 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3154 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3155 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3156 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3157 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3158 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3159 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3160 #endif
3161 ret = fib6_init();
3162 if (ret)
3163 goto out_register_subsys;
3164
3165 ret = xfrm6_init();
3166 if (ret)
3167 goto out_fib6_init;
3168
3169 ret = fib6_rules_init();
3170 if (ret)
3171 goto xfrm6_init;
3172
3173 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3174 if (ret)
3175 goto fib6_rules_init;
3176
3177 ret = -ENOBUFS;
3178 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3179 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3180 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3181 goto out_register_late_subsys;
3182
3183 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3184 if (ret)
3185 goto out_register_late_subsys;
3186
3187 out:
3188 return ret;
3189
3190 out_register_late_subsys:
3191 unregister_pernet_subsys(&ip6_route_net_late_ops);
3192 fib6_rules_init:
3193 fib6_rules_cleanup();
3194 xfrm6_init:
3195 xfrm6_fini();
3196 out_fib6_init:
3197 fib6_gc_cleanup();
3198 out_register_subsys:
3199 unregister_pernet_subsys(&ip6_route_net_ops);
3200 out_register_inetpeer:
3201 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3202 out_dst_entries:
3203 dst_entries_destroy(&ip6_dst_blackhole_ops);
3204 out_kmem_cache:
3205 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3206 goto out;
3207 }
3208
3209 void ip6_route_cleanup(void)
3210 {
3211 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3212 unregister_pernet_subsys(&ip6_route_net_late_ops);
3213 fib6_rules_cleanup();
3214 xfrm6_fini();
3215 fib6_gc_cleanup();
3216 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3217 unregister_pernet_subsys(&ip6_route_net_ops);
3218 dst_entries_destroy(&ip6_dst_blackhole_ops);
3219 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3220 }
Linux kernel - Deliverables
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