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ipv6: Check expire on DST_NOCACHE route
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / route.c
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/dst_metadata.h>
58 #include <net/xfrm.h>
59 #include <net/netevent.h>
60 #include <net/netlink.h>
61 #include <net/nexthop.h>
62 #include <net/lwtunnel.h>
63 #include <net/ip_tunnels.h>
64 #include <net/l3mdev.h>
65
66 #include <asm/uaccess.h>
67
68 #ifdef CONFIG_SYSCTL
69 #include <linux/sysctl.h>
70 #endif
71
72 enum rt6_nud_state {
73 RT6_NUD_FAIL_HARD = -3,
74 RT6_NUD_FAIL_PROBE = -2,
75 RT6_NUD_FAIL_DO_RR = -1,
76 RT6_NUD_SUCCEED = 1
77 };
78
79 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
80 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
81 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
82 static unsigned int ip6_mtu(const struct dst_entry *dst);
83 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
84 static void ip6_dst_destroy(struct dst_entry *);
85 static void ip6_dst_ifdown(struct dst_entry *,
86 struct net_device *dev, int how);
87 static int ip6_dst_gc(struct dst_ops *ops);
88
89 static int ip6_pkt_discard(struct sk_buff *skb);
90 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
91 static int ip6_pkt_prohibit(struct sk_buff *skb);
92 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
93 static void ip6_link_failure(struct sk_buff *skb);
94 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
95 struct sk_buff *skb, u32 mtu);
96 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
97 struct sk_buff *skb);
98 static void rt6_dst_from_metrics_check(struct rt6_info *rt);
99 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
100
101 #ifdef CONFIG_IPV6_ROUTE_INFO
102 static struct rt6_info *rt6_add_route_info(struct net *net,
103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, int ifindex,
105 unsigned int pref);
106 static struct rt6_info *rt6_get_route_info(struct net *net,
107 const struct in6_addr *prefix, int prefixlen,
108 const struct in6_addr *gwaddr, int ifindex);
109 #endif
110
111 struct uncached_list {
112 spinlock_t lock;
113 struct list_head head;
114 };
115
116 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
117
118 static void rt6_uncached_list_add(struct rt6_info *rt)
119 {
120 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
121
122 rt->dst.flags |= DST_NOCACHE;
123 rt->rt6i_uncached_list = ul;
124
125 spin_lock_bh(&ul->lock);
126 list_add_tail(&rt->rt6i_uncached, &ul->head);
127 spin_unlock_bh(&ul->lock);
128 }
129
130 static void rt6_uncached_list_del(struct rt6_info *rt)
131 {
132 if (!list_empty(&rt->rt6i_uncached)) {
133 struct uncached_list *ul = rt->rt6i_uncached_list;
134
135 spin_lock_bh(&ul->lock);
136 list_del(&rt->rt6i_uncached);
137 spin_unlock_bh(&ul->lock);
138 }
139 }
140
141 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
142 {
143 struct net_device *loopback_dev = net->loopback_dev;
144 int cpu;
145
146 if (dev == loopback_dev)
147 return;
148
149 for_each_possible_cpu(cpu) {
150 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
151 struct rt6_info *rt;
152
153 spin_lock_bh(&ul->lock);
154 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
155 struct inet6_dev *rt_idev = rt->rt6i_idev;
156 struct net_device *rt_dev = rt->dst.dev;
157
158 if (rt_idev->dev == dev) {
159 rt->rt6i_idev = in6_dev_get(loopback_dev);
160 in6_dev_put(rt_idev);
161 }
162
163 if (rt_dev == dev) {
164 rt->dst.dev = loopback_dev;
165 dev_hold(rt->dst.dev);
166 dev_put(rt_dev);
167 }
168 }
169 spin_unlock_bh(&ul->lock);
170 }
171 }
172
173 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
174 {
175 return dst_metrics_write_ptr(rt->dst.from);
176 }
177
178 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
179 {
180 struct rt6_info *rt = (struct rt6_info *)dst;
181
182 if (rt->rt6i_flags & RTF_PCPU)
183 return rt6_pcpu_cow_metrics(rt);
184 else if (rt->rt6i_flags & RTF_CACHE)
185 return NULL;
186 else
187 return dst_cow_metrics_generic(dst, old);
188 }
189
190 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
191 struct sk_buff *skb,
192 const void *daddr)
193 {
194 struct in6_addr *p = &rt->rt6i_gateway;
195
196 if (!ipv6_addr_any(p))
197 return (const void *) p;
198 else if (skb)
199 return &ipv6_hdr(skb)->daddr;
200 return daddr;
201 }
202
203 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
204 struct sk_buff *skb,
205 const void *daddr)
206 {
207 struct rt6_info *rt = (struct rt6_info *) dst;
208 struct neighbour *n;
209
210 daddr = choose_neigh_daddr(rt, skb, daddr);
211 n = __ipv6_neigh_lookup(dst->dev, daddr);
212 if (n)
213 return n;
214 return neigh_create(&nd_tbl, daddr, dst->dev);
215 }
216
217 static struct dst_ops ip6_dst_ops_template = {
218 .family = AF_INET6,
219 .gc = ip6_dst_gc,
220 .gc_thresh = 1024,
221 .check = ip6_dst_check,
222 .default_advmss = ip6_default_advmss,
223 .mtu = ip6_mtu,
224 .cow_metrics = ipv6_cow_metrics,
225 .destroy = ip6_dst_destroy,
226 .ifdown = ip6_dst_ifdown,
227 .negative_advice = ip6_negative_advice,
228 .link_failure = ip6_link_failure,
229 .update_pmtu = ip6_rt_update_pmtu,
230 .redirect = rt6_do_redirect,
231 .local_out = __ip6_local_out,
232 .neigh_lookup = ip6_neigh_lookup,
233 };
234
235 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
236 {
237 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
238
239 return mtu ? : dst->dev->mtu;
240 }
241
242 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
243 struct sk_buff *skb, u32 mtu)
244 {
245 }
246
247 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
248 struct sk_buff *skb)
249 {
250 }
251
252 static struct dst_ops ip6_dst_blackhole_ops = {
253 .family = AF_INET6,
254 .destroy = ip6_dst_destroy,
255 .check = ip6_dst_check,
256 .mtu = ip6_blackhole_mtu,
257 .default_advmss = ip6_default_advmss,
258 .update_pmtu = ip6_rt_blackhole_update_pmtu,
259 .redirect = ip6_rt_blackhole_redirect,
260 .cow_metrics = dst_cow_metrics_generic,
261 .neigh_lookup = ip6_neigh_lookup,
262 };
263
264 static const u32 ip6_template_metrics[RTAX_MAX] = {
265 [RTAX_HOPLIMIT - 1] = 0,
266 };
267
268 static const struct rt6_info ip6_null_entry_template = {
269 .dst = {
270 .__refcnt = ATOMIC_INIT(1),
271 .__use = 1,
272 .obsolete = DST_OBSOLETE_FORCE_CHK,
273 .error = -ENETUNREACH,
274 .input = ip6_pkt_discard,
275 .output = ip6_pkt_discard_out,
276 },
277 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
278 .rt6i_protocol = RTPROT_KERNEL,
279 .rt6i_metric = ~(u32) 0,
280 .rt6i_ref = ATOMIC_INIT(1),
281 };
282
283 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
284
285 static const struct rt6_info ip6_prohibit_entry_template = {
286 .dst = {
287 .__refcnt = ATOMIC_INIT(1),
288 .__use = 1,
289 .obsolete = DST_OBSOLETE_FORCE_CHK,
290 .error = -EACCES,
291 .input = ip6_pkt_prohibit,
292 .output = ip6_pkt_prohibit_out,
293 },
294 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
295 .rt6i_protocol = RTPROT_KERNEL,
296 .rt6i_metric = ~(u32) 0,
297 .rt6i_ref = ATOMIC_INIT(1),
298 };
299
300 static const struct rt6_info ip6_blk_hole_entry_template = {
301 .dst = {
302 .__refcnt = ATOMIC_INIT(1),
303 .__use = 1,
304 .obsolete = DST_OBSOLETE_FORCE_CHK,
305 .error = -EINVAL,
306 .input = dst_discard,
307 .output = dst_discard_out,
308 },
309 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
310 .rt6i_protocol = RTPROT_KERNEL,
311 .rt6i_metric = ~(u32) 0,
312 .rt6i_ref = ATOMIC_INIT(1),
313 };
314
315 #endif
316
317 static void rt6_info_init(struct rt6_info *rt)
318 {
319 struct dst_entry *dst = &rt->dst;
320
321 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
322 INIT_LIST_HEAD(&rt->rt6i_siblings);
323 INIT_LIST_HEAD(&rt->rt6i_uncached);
324 }
325
326 /* allocate dst with ip6_dst_ops */
327 static struct rt6_info *__ip6_dst_alloc(struct net *net,
328 struct net_device *dev,
329 int flags)
330 {
331 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
332 0, DST_OBSOLETE_FORCE_CHK, flags);
333
334 if (rt)
335 rt6_info_init(rt);
336
337 return rt;
338 }
339
340 static struct rt6_info *ip6_dst_alloc(struct net *net,
341 struct net_device *dev,
342 int flags)
343 {
344 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
345
346 if (rt) {
347 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
348 if (rt->rt6i_pcpu) {
349 int cpu;
350
351 for_each_possible_cpu(cpu) {
352 struct rt6_info **p;
353
354 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
355 /* no one shares rt */
356 *p = NULL;
357 }
358 } else {
359 dst_destroy((struct dst_entry *)rt);
360 return NULL;
361 }
362 }
363
364 return rt;
365 }
366
367 static void ip6_dst_destroy(struct dst_entry *dst)
368 {
369 struct rt6_info *rt = (struct rt6_info *)dst;
370 struct dst_entry *from = dst->from;
371 struct inet6_dev *idev;
372
373 dst_destroy_metrics_generic(dst);
374 free_percpu(rt->rt6i_pcpu);
375 rt6_uncached_list_del(rt);
376
377 idev = rt->rt6i_idev;
378 if (idev) {
379 rt->rt6i_idev = NULL;
380 in6_dev_put(idev);
381 }
382
383 dst->from = NULL;
384 dst_release(from);
385 }
386
387 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
388 int how)
389 {
390 struct rt6_info *rt = (struct rt6_info *)dst;
391 struct inet6_dev *idev = rt->rt6i_idev;
392 struct net_device *loopback_dev =
393 dev_net(dev)->loopback_dev;
394
395 if (dev != loopback_dev) {
396 if (idev && idev->dev == dev) {
397 struct inet6_dev *loopback_idev =
398 in6_dev_get(loopback_dev);
399 if (loopback_idev) {
400 rt->rt6i_idev = loopback_idev;
401 in6_dev_put(idev);
402 }
403 }
404 }
405 }
406
407 static bool __rt6_check_expired(const struct rt6_info *rt)
408 {
409 if (rt->rt6i_flags & RTF_EXPIRES)
410 return time_after(jiffies, rt->dst.expires);
411 else
412 return false;
413 }
414
415 static bool rt6_check_expired(const struct rt6_info *rt)
416 {
417 if (rt->rt6i_flags & RTF_EXPIRES) {
418 if (time_after(jiffies, rt->dst.expires))
419 return true;
420 } else if (rt->dst.from) {
421 return rt6_check_expired((struct rt6_info *) rt->dst.from);
422 }
423 return false;
424 }
425
426 /* Multipath route selection:
427 * Hash based function using packet header and flowlabel.
428 * Adapted from fib_info_hashfn()
429 */
430 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
431 const struct flowi6 *fl6)
432 {
433 return get_hash_from_flowi6(fl6) % candidate_count;
434 }
435
436 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
437 struct flowi6 *fl6, int oif,
438 int strict)
439 {
440 struct rt6_info *sibling, *next_sibling;
441 int route_choosen;
442
443 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
444 /* Don't change the route, if route_choosen == 0
445 * (siblings does not include ourself)
446 */
447 if (route_choosen)
448 list_for_each_entry_safe(sibling, next_sibling,
449 &match->rt6i_siblings, rt6i_siblings) {
450 route_choosen--;
451 if (route_choosen == 0) {
452 if (rt6_score_route(sibling, oif, strict) < 0)
453 break;
454 match = sibling;
455 break;
456 }
457 }
458 return match;
459 }
460
461 /*
462 * Route lookup. Any table->tb6_lock is implied.
463 */
464
465 static inline struct rt6_info *rt6_device_match(struct net *net,
466 struct rt6_info *rt,
467 const struct in6_addr *saddr,
468 int oif,
469 int flags)
470 {
471 struct rt6_info *local = NULL;
472 struct rt6_info *sprt;
473
474 if (!oif && ipv6_addr_any(saddr))
475 goto out;
476
477 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
478 struct net_device *dev = sprt->dst.dev;
479
480 if (oif) {
481 if (dev->ifindex == oif)
482 return sprt;
483 if (dev->flags & IFF_LOOPBACK) {
484 if (!sprt->rt6i_idev ||
485 sprt->rt6i_idev->dev->ifindex != oif) {
486 if (flags & RT6_LOOKUP_F_IFACE)
487 continue;
488 if (local &&
489 local->rt6i_idev->dev->ifindex == oif)
490 continue;
491 }
492 local = sprt;
493 }
494 } else {
495 if (ipv6_chk_addr(net, saddr, dev,
496 flags & RT6_LOOKUP_F_IFACE))
497 return sprt;
498 }
499 }
500
501 if (oif) {
502 if (local)
503 return local;
504
505 if (flags & RT6_LOOKUP_F_IFACE)
506 return net->ipv6.ip6_null_entry;
507 }
508 out:
509 return rt;
510 }
511
512 #ifdef CONFIG_IPV6_ROUTER_PREF
513 struct __rt6_probe_work {
514 struct work_struct work;
515 struct in6_addr target;
516 struct net_device *dev;
517 };
518
519 static void rt6_probe_deferred(struct work_struct *w)
520 {
521 struct in6_addr mcaddr;
522 struct __rt6_probe_work *work =
523 container_of(w, struct __rt6_probe_work, work);
524
525 addrconf_addr_solict_mult(&work->target, &mcaddr);
526 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, NULL);
527 dev_put(work->dev);
528 kfree(work);
529 }
530
531 static void rt6_probe(struct rt6_info *rt)
532 {
533 struct __rt6_probe_work *work;
534 struct neighbour *neigh;
535 /*
536 * Okay, this does not seem to be appropriate
537 * for now, however, we need to check if it
538 * is really so; aka Router Reachability Probing.
539 *
540 * Router Reachability Probe MUST be rate-limited
541 * to no more than one per minute.
542 */
543 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
544 return;
545 rcu_read_lock_bh();
546 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
547 if (neigh) {
548 if (neigh->nud_state & NUD_VALID)
549 goto out;
550
551 work = NULL;
552 write_lock(&neigh->lock);
553 if (!(neigh->nud_state & NUD_VALID) &&
554 time_after(jiffies,
555 neigh->updated +
556 rt->rt6i_idev->cnf.rtr_probe_interval)) {
557 work = kmalloc(sizeof(*work), GFP_ATOMIC);
558 if (work)
559 __neigh_set_probe_once(neigh);
560 }
561 write_unlock(&neigh->lock);
562 } else {
563 work = kmalloc(sizeof(*work), GFP_ATOMIC);
564 }
565
566 if (work) {
567 INIT_WORK(&work->work, rt6_probe_deferred);
568 work->target = rt->rt6i_gateway;
569 dev_hold(rt->dst.dev);
570 work->dev = rt->dst.dev;
571 schedule_work(&work->work);
572 }
573
574 out:
575 rcu_read_unlock_bh();
576 }
577 #else
578 static inline void rt6_probe(struct rt6_info *rt)
579 {
580 }
581 #endif
582
583 /*
584 * Default Router Selection (RFC 2461 6.3.6)
585 */
586 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
587 {
588 struct net_device *dev = rt->dst.dev;
589 if (!oif || dev->ifindex == oif)
590 return 2;
591 if ((dev->flags & IFF_LOOPBACK) &&
592 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
593 return 1;
594 return 0;
595 }
596
597 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
598 {
599 struct neighbour *neigh;
600 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
601
602 if (rt->rt6i_flags & RTF_NONEXTHOP ||
603 !(rt->rt6i_flags & RTF_GATEWAY))
604 return RT6_NUD_SUCCEED;
605
606 rcu_read_lock_bh();
607 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
608 if (neigh) {
609 read_lock(&neigh->lock);
610 if (neigh->nud_state & NUD_VALID)
611 ret = RT6_NUD_SUCCEED;
612 #ifdef CONFIG_IPV6_ROUTER_PREF
613 else if (!(neigh->nud_state & NUD_FAILED))
614 ret = RT6_NUD_SUCCEED;
615 else
616 ret = RT6_NUD_FAIL_PROBE;
617 #endif
618 read_unlock(&neigh->lock);
619 } else {
620 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
621 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
622 }
623 rcu_read_unlock_bh();
624
625 return ret;
626 }
627
628 static int rt6_score_route(struct rt6_info *rt, int oif,
629 int strict)
630 {
631 int m;
632
633 m = rt6_check_dev(rt, oif);
634 if (!m && (strict & RT6_LOOKUP_F_IFACE))
635 return RT6_NUD_FAIL_HARD;
636 #ifdef CONFIG_IPV6_ROUTER_PREF
637 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
638 #endif
639 if (strict & RT6_LOOKUP_F_REACHABLE) {
640 int n = rt6_check_neigh(rt);
641 if (n < 0)
642 return n;
643 }
644 return m;
645 }
646
647 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
648 int *mpri, struct rt6_info *match,
649 bool *do_rr)
650 {
651 int m;
652 bool match_do_rr = false;
653 struct inet6_dev *idev = rt->rt6i_idev;
654 struct net_device *dev = rt->dst.dev;
655
656 if (dev && !netif_carrier_ok(dev) &&
657 idev->cnf.ignore_routes_with_linkdown)
658 goto out;
659
660 if (rt6_check_expired(rt))
661 goto out;
662
663 m = rt6_score_route(rt, oif, strict);
664 if (m == RT6_NUD_FAIL_DO_RR) {
665 match_do_rr = true;
666 m = 0; /* lowest valid score */
667 } else if (m == RT6_NUD_FAIL_HARD) {
668 goto out;
669 }
670
671 if (strict & RT6_LOOKUP_F_REACHABLE)
672 rt6_probe(rt);
673
674 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
675 if (m > *mpri) {
676 *do_rr = match_do_rr;
677 *mpri = m;
678 match = rt;
679 }
680 out:
681 return match;
682 }
683
684 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
685 struct rt6_info *rr_head,
686 u32 metric, int oif, int strict,
687 bool *do_rr)
688 {
689 struct rt6_info *rt, *match, *cont;
690 int mpri = -1;
691
692 match = NULL;
693 cont = NULL;
694 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
695 if (rt->rt6i_metric != metric) {
696 cont = rt;
697 break;
698 }
699
700 match = find_match(rt, oif, strict, &mpri, match, do_rr);
701 }
702
703 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
704 if (rt->rt6i_metric != metric) {
705 cont = rt;
706 break;
707 }
708
709 match = find_match(rt, oif, strict, &mpri, match, do_rr);
710 }
711
712 if (match || !cont)
713 return match;
714
715 for (rt = cont; rt; rt = rt->dst.rt6_next)
716 match = find_match(rt, oif, strict, &mpri, match, do_rr);
717
718 return match;
719 }
720
721 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
722 {
723 struct rt6_info *match, *rt0;
724 struct net *net;
725 bool do_rr = false;
726
727 rt0 = fn->rr_ptr;
728 if (!rt0)
729 fn->rr_ptr = rt0 = fn->leaf;
730
731 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
732 &do_rr);
733
734 if (do_rr) {
735 struct rt6_info *next = rt0->dst.rt6_next;
736
737 /* no entries matched; do round-robin */
738 if (!next || next->rt6i_metric != rt0->rt6i_metric)
739 next = fn->leaf;
740
741 if (next != rt0)
742 fn->rr_ptr = next;
743 }
744
745 net = dev_net(rt0->dst.dev);
746 return match ? match : net->ipv6.ip6_null_entry;
747 }
748
749 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
750 {
751 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
752 }
753
754 #ifdef CONFIG_IPV6_ROUTE_INFO
755 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
756 const struct in6_addr *gwaddr)
757 {
758 struct net *net = dev_net(dev);
759 struct route_info *rinfo = (struct route_info *) opt;
760 struct in6_addr prefix_buf, *prefix;
761 unsigned int pref;
762 unsigned long lifetime;
763 struct rt6_info *rt;
764
765 if (len < sizeof(struct route_info)) {
766 return -EINVAL;
767 }
768
769 /* Sanity check for prefix_len and length */
770 if (rinfo->length > 3) {
771 return -EINVAL;
772 } else if (rinfo->prefix_len > 128) {
773 return -EINVAL;
774 } else if (rinfo->prefix_len > 64) {
775 if (rinfo->length < 2) {
776 return -EINVAL;
777 }
778 } else if (rinfo->prefix_len > 0) {
779 if (rinfo->length < 1) {
780 return -EINVAL;
781 }
782 }
783
784 pref = rinfo->route_pref;
785 if (pref == ICMPV6_ROUTER_PREF_INVALID)
786 return -EINVAL;
787
788 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
789
790 if (rinfo->length == 3)
791 prefix = (struct in6_addr *)rinfo->prefix;
792 else {
793 /* this function is safe */
794 ipv6_addr_prefix(&prefix_buf,
795 (struct in6_addr *)rinfo->prefix,
796 rinfo->prefix_len);
797 prefix = &prefix_buf;
798 }
799
800 if (rinfo->prefix_len == 0)
801 rt = rt6_get_dflt_router(gwaddr, dev);
802 else
803 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
804 gwaddr, dev->ifindex);
805
806 if (rt && !lifetime) {
807 ip6_del_rt(rt);
808 rt = NULL;
809 }
810
811 if (!rt && lifetime)
812 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
813 pref);
814 else if (rt)
815 rt->rt6i_flags = RTF_ROUTEINFO |
816 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
817
818 if (rt) {
819 if (!addrconf_finite_timeout(lifetime))
820 rt6_clean_expires(rt);
821 else
822 rt6_set_expires(rt, jiffies + HZ * lifetime);
823
824 ip6_rt_put(rt);
825 }
826 return 0;
827 }
828 #endif
829
830 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
831 struct in6_addr *saddr)
832 {
833 struct fib6_node *pn;
834 while (1) {
835 if (fn->fn_flags & RTN_TL_ROOT)
836 return NULL;
837 pn = fn->parent;
838 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
839 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
840 else
841 fn = pn;
842 if (fn->fn_flags & RTN_RTINFO)
843 return fn;
844 }
845 }
846
847 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
848 struct fib6_table *table,
849 struct flowi6 *fl6, int flags)
850 {
851 struct fib6_node *fn;
852 struct rt6_info *rt;
853
854 read_lock_bh(&table->tb6_lock);
855 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
856 restart:
857 rt = fn->leaf;
858 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
859 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
860 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
861 if (rt == net->ipv6.ip6_null_entry) {
862 fn = fib6_backtrack(fn, &fl6->saddr);
863 if (fn)
864 goto restart;
865 }
866 dst_use(&rt->dst, jiffies);
867 read_unlock_bh(&table->tb6_lock);
868 return rt;
869
870 }
871
872 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
873 int flags)
874 {
875 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
876 }
877 EXPORT_SYMBOL_GPL(ip6_route_lookup);
878
879 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
880 const struct in6_addr *saddr, int oif, int strict)
881 {
882 struct flowi6 fl6 = {
883 .flowi6_oif = oif,
884 .daddr = *daddr,
885 };
886 struct dst_entry *dst;
887 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
888
889 if (saddr) {
890 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
891 flags |= RT6_LOOKUP_F_HAS_SADDR;
892 }
893
894 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
895 if (dst->error == 0)
896 return (struct rt6_info *) dst;
897
898 dst_release(dst);
899
900 return NULL;
901 }
902 EXPORT_SYMBOL(rt6_lookup);
903
904 /* ip6_ins_rt is called with FREE table->tb6_lock.
905 It takes new route entry, the addition fails by any reason the
906 route is freed. In any case, if caller does not hold it, it may
907 be destroyed.
908 */
909
910 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
911 struct mx6_config *mxc)
912 {
913 int err;
914 struct fib6_table *table;
915
916 table = rt->rt6i_table;
917 write_lock_bh(&table->tb6_lock);
918 err = fib6_add(&table->tb6_root, rt, info, mxc);
919 write_unlock_bh(&table->tb6_lock);
920
921 return err;
922 }
923
924 int ip6_ins_rt(struct rt6_info *rt)
925 {
926 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
927 struct mx6_config mxc = { .mx = NULL, };
928
929 return __ip6_ins_rt(rt, &info, &mxc);
930 }
931
932 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
933 const struct in6_addr *daddr,
934 const struct in6_addr *saddr)
935 {
936 struct rt6_info *rt;
937
938 /*
939 * Clone the route.
940 */
941
942 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
943 ort = (struct rt6_info *)ort->dst.from;
944
945 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
946
947 if (!rt)
948 return NULL;
949
950 ip6_rt_copy_init(rt, ort);
951 rt->rt6i_flags |= RTF_CACHE;
952 rt->rt6i_metric = 0;
953 rt->dst.flags |= DST_HOST;
954 rt->rt6i_dst.addr = *daddr;
955 rt->rt6i_dst.plen = 128;
956
957 if (!rt6_is_gw_or_nonexthop(ort)) {
958 if (ort->rt6i_dst.plen != 128 &&
959 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
960 rt->rt6i_flags |= RTF_ANYCAST;
961 #ifdef CONFIG_IPV6_SUBTREES
962 if (rt->rt6i_src.plen && saddr) {
963 rt->rt6i_src.addr = *saddr;
964 rt->rt6i_src.plen = 128;
965 }
966 #endif
967 }
968
969 return rt;
970 }
971
972 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
973 {
974 struct rt6_info *pcpu_rt;
975
976 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
977 rt->dst.dev, rt->dst.flags);
978
979 if (!pcpu_rt)
980 return NULL;
981 ip6_rt_copy_init(pcpu_rt, rt);
982 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
983 pcpu_rt->rt6i_flags |= RTF_PCPU;
984 return pcpu_rt;
985 }
986
987 /* It should be called with read_lock_bh(&tb6_lock) acquired */
988 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
989 {
990 struct rt6_info *pcpu_rt, **p;
991
992 p = this_cpu_ptr(rt->rt6i_pcpu);
993 pcpu_rt = *p;
994
995 if (pcpu_rt) {
996 dst_hold(&pcpu_rt->dst);
997 rt6_dst_from_metrics_check(pcpu_rt);
998 }
999 return pcpu_rt;
1000 }
1001
1002 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1003 {
1004 struct fib6_table *table = rt->rt6i_table;
1005 struct rt6_info *pcpu_rt, *prev, **p;
1006
1007 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1008 if (!pcpu_rt) {
1009 struct net *net = dev_net(rt->dst.dev);
1010
1011 dst_hold(&net->ipv6.ip6_null_entry->dst);
1012 return net->ipv6.ip6_null_entry;
1013 }
1014
1015 read_lock_bh(&table->tb6_lock);
1016 if (rt->rt6i_pcpu) {
1017 p = this_cpu_ptr(rt->rt6i_pcpu);
1018 prev = cmpxchg(p, NULL, pcpu_rt);
1019 if (prev) {
1020 /* If someone did it before us, return prev instead */
1021 dst_destroy(&pcpu_rt->dst);
1022 pcpu_rt = prev;
1023 }
1024 } else {
1025 /* rt has been removed from the fib6 tree
1026 * before we have a chance to acquire the read_lock.
1027 * In this case, don't brother to create a pcpu rt
1028 * since rt is going away anyway. The next
1029 * dst_check() will trigger a re-lookup.
1030 */
1031 dst_destroy(&pcpu_rt->dst);
1032 pcpu_rt = rt;
1033 }
1034 dst_hold(&pcpu_rt->dst);
1035 rt6_dst_from_metrics_check(pcpu_rt);
1036 read_unlock_bh(&table->tb6_lock);
1037 return pcpu_rt;
1038 }
1039
1040 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1041 struct flowi6 *fl6, int flags)
1042 {
1043 struct fib6_node *fn, *saved_fn;
1044 struct rt6_info *rt;
1045 int strict = 0;
1046
1047 strict |= flags & RT6_LOOKUP_F_IFACE;
1048 if (net->ipv6.devconf_all->forwarding == 0)
1049 strict |= RT6_LOOKUP_F_REACHABLE;
1050
1051 read_lock_bh(&table->tb6_lock);
1052
1053 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1054 saved_fn = fn;
1055
1056 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1057 oif = 0;
1058
1059 redo_rt6_select:
1060 rt = rt6_select(fn, oif, strict);
1061 if (rt->rt6i_nsiblings)
1062 rt = rt6_multipath_select(rt, fl6, oif, strict);
1063 if (rt == net->ipv6.ip6_null_entry) {
1064 fn = fib6_backtrack(fn, &fl6->saddr);
1065 if (fn)
1066 goto redo_rt6_select;
1067 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1068 /* also consider unreachable route */
1069 strict &= ~RT6_LOOKUP_F_REACHABLE;
1070 fn = saved_fn;
1071 goto redo_rt6_select;
1072 }
1073 }
1074
1075
1076 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1077 dst_use(&rt->dst, jiffies);
1078 read_unlock_bh(&table->tb6_lock);
1079
1080 rt6_dst_from_metrics_check(rt);
1081 return rt;
1082 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1083 !(rt->rt6i_flags & RTF_GATEWAY))) {
1084 /* Create a RTF_CACHE clone which will not be
1085 * owned by the fib6 tree. It is for the special case where
1086 * the daddr in the skb during the neighbor look-up is different
1087 * from the fl6->daddr used to look-up route here.
1088 */
1089
1090 struct rt6_info *uncached_rt;
1091
1092 dst_use(&rt->dst, jiffies);
1093 read_unlock_bh(&table->tb6_lock);
1094
1095 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1096 dst_release(&rt->dst);
1097
1098 if (uncached_rt)
1099 rt6_uncached_list_add(uncached_rt);
1100 else
1101 uncached_rt = net->ipv6.ip6_null_entry;
1102
1103 dst_hold(&uncached_rt->dst);
1104 return uncached_rt;
1105
1106 } else {
1107 /* Get a percpu copy */
1108
1109 struct rt6_info *pcpu_rt;
1110
1111 rt->dst.lastuse = jiffies;
1112 rt->dst.__use++;
1113 pcpu_rt = rt6_get_pcpu_route(rt);
1114
1115 if (pcpu_rt) {
1116 read_unlock_bh(&table->tb6_lock);
1117 } else {
1118 /* We have to do the read_unlock first
1119 * because rt6_make_pcpu_route() may trigger
1120 * ip6_dst_gc() which will take the write_lock.
1121 */
1122 dst_hold(&rt->dst);
1123 read_unlock_bh(&table->tb6_lock);
1124 pcpu_rt = rt6_make_pcpu_route(rt);
1125 dst_release(&rt->dst);
1126 }
1127
1128 return pcpu_rt;
1129
1130 }
1131 }
1132
1133 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1134 struct flowi6 *fl6, int flags)
1135 {
1136 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1137 }
1138
1139 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1140 struct net_device *dev,
1141 struct flowi6 *fl6, int flags)
1142 {
1143 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1144 flags |= RT6_LOOKUP_F_IFACE;
1145
1146 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1147 }
1148
1149 void ip6_route_input(struct sk_buff *skb)
1150 {
1151 const struct ipv6hdr *iph = ipv6_hdr(skb);
1152 struct net *net = dev_net(skb->dev);
1153 int flags = RT6_LOOKUP_F_HAS_SADDR;
1154 struct ip_tunnel_info *tun_info;
1155 struct flowi6 fl6 = {
1156 .flowi6_iif = l3mdev_fib_oif(skb->dev),
1157 .daddr = iph->daddr,
1158 .saddr = iph->saddr,
1159 .flowlabel = ip6_flowinfo(iph),
1160 .flowi6_mark = skb->mark,
1161 .flowi6_proto = iph->nexthdr,
1162 };
1163
1164 tun_info = skb_tunnel_info(skb);
1165 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1166 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1167 skb_dst_drop(skb);
1168 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1169 }
1170
1171 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1172 struct flowi6 *fl6, int flags)
1173 {
1174 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1175 }
1176
1177 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
1178 struct flowi6 *fl6)
1179 {
1180 struct dst_entry *dst;
1181 int flags = 0;
1182 bool any_src;
1183
1184 dst = l3mdev_rt6_dst_by_oif(net, fl6);
1185 if (dst)
1186 return dst;
1187
1188 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1189
1190 any_src = ipv6_addr_any(&fl6->saddr);
1191 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1192 (fl6->flowi6_oif && any_src))
1193 flags |= RT6_LOOKUP_F_IFACE;
1194
1195 if (!any_src)
1196 flags |= RT6_LOOKUP_F_HAS_SADDR;
1197 else if (sk)
1198 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1199
1200 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1201 }
1202 EXPORT_SYMBOL(ip6_route_output);
1203
1204 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1205 {
1206 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1207 struct dst_entry *new = NULL;
1208
1209 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1210 if (rt) {
1211 rt6_info_init(rt);
1212
1213 new = &rt->dst;
1214 new->__use = 1;
1215 new->input = dst_discard;
1216 new->output = dst_discard_out;
1217
1218 dst_copy_metrics(new, &ort->dst);
1219 rt->rt6i_idev = ort->rt6i_idev;
1220 if (rt->rt6i_idev)
1221 in6_dev_hold(rt->rt6i_idev);
1222
1223 rt->rt6i_gateway = ort->rt6i_gateway;
1224 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1225 rt->rt6i_metric = 0;
1226
1227 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1228 #ifdef CONFIG_IPV6_SUBTREES
1229 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1230 #endif
1231
1232 dst_free(new);
1233 }
1234
1235 dst_release(dst_orig);
1236 return new ? new : ERR_PTR(-ENOMEM);
1237 }
1238
1239 /*
1240 * Destination cache support functions
1241 */
1242
1243 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1244 {
1245 if (rt->dst.from &&
1246 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1247 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1248 }
1249
1250 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1251 {
1252 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1253 return NULL;
1254
1255 if (rt6_check_expired(rt))
1256 return NULL;
1257
1258 return &rt->dst;
1259 }
1260
1261 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1262 {
1263 if (!__rt6_check_expired(rt) &&
1264 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1265 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1266 return &rt->dst;
1267 else
1268 return NULL;
1269 }
1270
1271 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1272 {
1273 struct rt6_info *rt;
1274
1275 rt = (struct rt6_info *) dst;
1276
1277 /* All IPV6 dsts are created with ->obsolete set to the value
1278 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1279 * into this function always.
1280 */
1281
1282 rt6_dst_from_metrics_check(rt);
1283
1284 if ((rt->rt6i_flags & RTF_PCPU) || unlikely(dst->flags & DST_NOCACHE))
1285 return rt6_dst_from_check(rt, cookie);
1286 else
1287 return rt6_check(rt, cookie);
1288 }
1289
1290 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1291 {
1292 struct rt6_info *rt = (struct rt6_info *) dst;
1293
1294 if (rt) {
1295 if (rt->rt6i_flags & RTF_CACHE) {
1296 if (rt6_check_expired(rt)) {
1297 ip6_del_rt(rt);
1298 dst = NULL;
1299 }
1300 } else {
1301 dst_release(dst);
1302 dst = NULL;
1303 }
1304 }
1305 return dst;
1306 }
1307
1308 static void ip6_link_failure(struct sk_buff *skb)
1309 {
1310 struct rt6_info *rt;
1311
1312 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1313
1314 rt = (struct rt6_info *) skb_dst(skb);
1315 if (rt) {
1316 if (rt->rt6i_flags & RTF_CACHE) {
1317 dst_hold(&rt->dst);
1318 ip6_del_rt(rt);
1319 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1320 rt->rt6i_node->fn_sernum = -1;
1321 }
1322 }
1323 }
1324
1325 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1326 {
1327 struct net *net = dev_net(rt->dst.dev);
1328
1329 rt->rt6i_flags |= RTF_MODIFIED;
1330 rt->rt6i_pmtu = mtu;
1331 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1332 }
1333
1334 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1335 {
1336 return !(rt->rt6i_flags & RTF_CACHE) &&
1337 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1338 }
1339
1340 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1341 const struct ipv6hdr *iph, u32 mtu)
1342 {
1343 struct rt6_info *rt6 = (struct rt6_info *)dst;
1344
1345 if (rt6->rt6i_flags & RTF_LOCAL)
1346 return;
1347
1348 dst_confirm(dst);
1349 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1350 if (mtu >= dst_mtu(dst))
1351 return;
1352
1353 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1354 rt6_do_update_pmtu(rt6, mtu);
1355 } else {
1356 const struct in6_addr *daddr, *saddr;
1357 struct rt6_info *nrt6;
1358
1359 if (iph) {
1360 daddr = &iph->daddr;
1361 saddr = &iph->saddr;
1362 } else if (sk) {
1363 daddr = &sk->sk_v6_daddr;
1364 saddr = &inet6_sk(sk)->saddr;
1365 } else {
1366 return;
1367 }
1368 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1369 if (nrt6) {
1370 rt6_do_update_pmtu(nrt6, mtu);
1371
1372 /* ip6_ins_rt(nrt6) will bump the
1373 * rt6->rt6i_node->fn_sernum
1374 * which will fail the next rt6_check() and
1375 * invalidate the sk->sk_dst_cache.
1376 */
1377 ip6_ins_rt(nrt6);
1378 }
1379 }
1380 }
1381
1382 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1383 struct sk_buff *skb, u32 mtu)
1384 {
1385 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1386 }
1387
1388 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1389 int oif, u32 mark)
1390 {
1391 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1392 struct dst_entry *dst;
1393 struct flowi6 fl6;
1394
1395 memset(&fl6, 0, sizeof(fl6));
1396 fl6.flowi6_oif = oif;
1397 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1398 fl6.daddr = iph->daddr;
1399 fl6.saddr = iph->saddr;
1400 fl6.flowlabel = ip6_flowinfo(iph);
1401
1402 dst = ip6_route_output(net, NULL, &fl6);
1403 if (!dst->error)
1404 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1405 dst_release(dst);
1406 }
1407 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1408
1409 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1410 {
1411 ip6_update_pmtu(skb, sock_net(sk), mtu,
1412 sk->sk_bound_dev_if, sk->sk_mark);
1413 }
1414 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1415
1416 /* Handle redirects */
1417 struct ip6rd_flowi {
1418 struct flowi6 fl6;
1419 struct in6_addr gateway;
1420 };
1421
1422 static struct rt6_info *__ip6_route_redirect(struct net *net,
1423 struct fib6_table *table,
1424 struct flowi6 *fl6,
1425 int flags)
1426 {
1427 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1428 struct rt6_info *rt;
1429 struct fib6_node *fn;
1430
1431 /* Get the "current" route for this destination and
1432 * check if the redirect has come from approriate router.
1433 *
1434 * RFC 4861 specifies that redirects should only be
1435 * accepted if they come from the nexthop to the target.
1436 * Due to the way the routes are chosen, this notion
1437 * is a bit fuzzy and one might need to check all possible
1438 * routes.
1439 */
1440
1441 read_lock_bh(&table->tb6_lock);
1442 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1443 restart:
1444 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1445 if (rt6_check_expired(rt))
1446 continue;
1447 if (rt->dst.error)
1448 break;
1449 if (!(rt->rt6i_flags & RTF_GATEWAY))
1450 continue;
1451 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1452 continue;
1453 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1454 continue;
1455 break;
1456 }
1457
1458 if (!rt)
1459 rt = net->ipv6.ip6_null_entry;
1460 else if (rt->dst.error) {
1461 rt = net->ipv6.ip6_null_entry;
1462 goto out;
1463 }
1464
1465 if (rt == net->ipv6.ip6_null_entry) {
1466 fn = fib6_backtrack(fn, &fl6->saddr);
1467 if (fn)
1468 goto restart;
1469 }
1470
1471 out:
1472 dst_hold(&rt->dst);
1473
1474 read_unlock_bh(&table->tb6_lock);
1475
1476 return rt;
1477 };
1478
1479 static struct dst_entry *ip6_route_redirect(struct net *net,
1480 const struct flowi6 *fl6,
1481 const struct in6_addr *gateway)
1482 {
1483 int flags = RT6_LOOKUP_F_HAS_SADDR;
1484 struct ip6rd_flowi rdfl;
1485
1486 rdfl.fl6 = *fl6;
1487 rdfl.gateway = *gateway;
1488
1489 return fib6_rule_lookup(net, &rdfl.fl6,
1490 flags, __ip6_route_redirect);
1491 }
1492
1493 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1494 {
1495 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1496 struct dst_entry *dst;
1497 struct flowi6 fl6;
1498
1499 memset(&fl6, 0, sizeof(fl6));
1500 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1501 fl6.flowi6_oif = oif;
1502 fl6.flowi6_mark = mark;
1503 fl6.daddr = iph->daddr;
1504 fl6.saddr = iph->saddr;
1505 fl6.flowlabel = ip6_flowinfo(iph);
1506
1507 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1508 rt6_do_redirect(dst, NULL, skb);
1509 dst_release(dst);
1510 }
1511 EXPORT_SYMBOL_GPL(ip6_redirect);
1512
1513 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1514 u32 mark)
1515 {
1516 const struct ipv6hdr *iph = ipv6_hdr(skb);
1517 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1518 struct dst_entry *dst;
1519 struct flowi6 fl6;
1520
1521 memset(&fl6, 0, sizeof(fl6));
1522 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1523 fl6.flowi6_oif = oif;
1524 fl6.flowi6_mark = mark;
1525 fl6.daddr = msg->dest;
1526 fl6.saddr = iph->daddr;
1527
1528 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1529 rt6_do_redirect(dst, NULL, skb);
1530 dst_release(dst);
1531 }
1532
1533 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1534 {
1535 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1536 }
1537 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1538
1539 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1540 {
1541 struct net_device *dev = dst->dev;
1542 unsigned int mtu = dst_mtu(dst);
1543 struct net *net = dev_net(dev);
1544
1545 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1546
1547 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1548 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1549
1550 /*
1551 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1552 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1553 * IPV6_MAXPLEN is also valid and means: "any MSS,
1554 * rely only on pmtu discovery"
1555 */
1556 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1557 mtu = IPV6_MAXPLEN;
1558 return mtu;
1559 }
1560
1561 static unsigned int ip6_mtu(const struct dst_entry *dst)
1562 {
1563 const struct rt6_info *rt = (const struct rt6_info *)dst;
1564 unsigned int mtu = rt->rt6i_pmtu;
1565 struct inet6_dev *idev;
1566
1567 if (mtu)
1568 goto out;
1569
1570 mtu = dst_metric_raw(dst, RTAX_MTU);
1571 if (mtu)
1572 goto out;
1573
1574 mtu = IPV6_MIN_MTU;
1575
1576 rcu_read_lock();
1577 idev = __in6_dev_get(dst->dev);
1578 if (idev)
1579 mtu = idev->cnf.mtu6;
1580 rcu_read_unlock();
1581
1582 out:
1583 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1584 }
1585
1586 static struct dst_entry *icmp6_dst_gc_list;
1587 static DEFINE_SPINLOCK(icmp6_dst_lock);
1588
1589 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1590 struct flowi6 *fl6)
1591 {
1592 struct dst_entry *dst;
1593 struct rt6_info *rt;
1594 struct inet6_dev *idev = in6_dev_get(dev);
1595 struct net *net = dev_net(dev);
1596
1597 if (unlikely(!idev))
1598 return ERR_PTR(-ENODEV);
1599
1600 rt = ip6_dst_alloc(net, dev, 0);
1601 if (unlikely(!rt)) {
1602 in6_dev_put(idev);
1603 dst = ERR_PTR(-ENOMEM);
1604 goto out;
1605 }
1606
1607 rt->dst.flags |= DST_HOST;
1608 rt->dst.output = ip6_output;
1609 atomic_set(&rt->dst.__refcnt, 1);
1610 rt->rt6i_gateway = fl6->daddr;
1611 rt->rt6i_dst.addr = fl6->daddr;
1612 rt->rt6i_dst.plen = 128;
1613 rt->rt6i_idev = idev;
1614 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1615
1616 spin_lock_bh(&icmp6_dst_lock);
1617 rt->dst.next = icmp6_dst_gc_list;
1618 icmp6_dst_gc_list = &rt->dst;
1619 spin_unlock_bh(&icmp6_dst_lock);
1620
1621 fib6_force_start_gc(net);
1622
1623 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1624
1625 out:
1626 return dst;
1627 }
1628
1629 int icmp6_dst_gc(void)
1630 {
1631 struct dst_entry *dst, **pprev;
1632 int more = 0;
1633
1634 spin_lock_bh(&icmp6_dst_lock);
1635 pprev = &icmp6_dst_gc_list;
1636
1637 while ((dst = *pprev) != NULL) {
1638 if (!atomic_read(&dst->__refcnt)) {
1639 *pprev = dst->next;
1640 dst_free(dst);
1641 } else {
1642 pprev = &dst->next;
1643 ++more;
1644 }
1645 }
1646
1647 spin_unlock_bh(&icmp6_dst_lock);
1648
1649 return more;
1650 }
1651
1652 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1653 void *arg)
1654 {
1655 struct dst_entry *dst, **pprev;
1656
1657 spin_lock_bh(&icmp6_dst_lock);
1658 pprev = &icmp6_dst_gc_list;
1659 while ((dst = *pprev) != NULL) {
1660 struct rt6_info *rt = (struct rt6_info *) dst;
1661 if (func(rt, arg)) {
1662 *pprev = dst->next;
1663 dst_free(dst);
1664 } else {
1665 pprev = &dst->next;
1666 }
1667 }
1668 spin_unlock_bh(&icmp6_dst_lock);
1669 }
1670
1671 static int ip6_dst_gc(struct dst_ops *ops)
1672 {
1673 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1674 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1675 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1676 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1677 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1678 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1679 int entries;
1680
1681 entries = dst_entries_get_fast(ops);
1682 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1683 entries <= rt_max_size)
1684 goto out;
1685
1686 net->ipv6.ip6_rt_gc_expire++;
1687 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1688 entries = dst_entries_get_slow(ops);
1689 if (entries < ops->gc_thresh)
1690 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1691 out:
1692 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1693 return entries > rt_max_size;
1694 }
1695
1696 static int ip6_convert_metrics(struct mx6_config *mxc,
1697 const struct fib6_config *cfg)
1698 {
1699 bool ecn_ca = false;
1700 struct nlattr *nla;
1701 int remaining;
1702 u32 *mp;
1703
1704 if (!cfg->fc_mx)
1705 return 0;
1706
1707 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1708 if (unlikely(!mp))
1709 return -ENOMEM;
1710
1711 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1712 int type = nla_type(nla);
1713 u32 val;
1714
1715 if (!type)
1716 continue;
1717 if (unlikely(type > RTAX_MAX))
1718 goto err;
1719
1720 if (type == RTAX_CC_ALGO) {
1721 char tmp[TCP_CA_NAME_MAX];
1722
1723 nla_strlcpy(tmp, nla, sizeof(tmp));
1724 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1725 if (val == TCP_CA_UNSPEC)
1726 goto err;
1727 } else {
1728 val = nla_get_u32(nla);
1729 }
1730 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1731 goto err;
1732
1733 mp[type - 1] = val;
1734 __set_bit(type - 1, mxc->mx_valid);
1735 }
1736
1737 if (ecn_ca) {
1738 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1739 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1740 }
1741
1742 mxc->mx = mp;
1743 return 0;
1744 err:
1745 kfree(mp);
1746 return -EINVAL;
1747 }
1748
1749 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1750 {
1751 struct net *net = cfg->fc_nlinfo.nl_net;
1752 struct rt6_info *rt = NULL;
1753 struct net_device *dev = NULL;
1754 struct inet6_dev *idev = NULL;
1755 struct fib6_table *table;
1756 int addr_type;
1757 int err = -EINVAL;
1758
1759 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1760 goto out;
1761 #ifndef CONFIG_IPV6_SUBTREES
1762 if (cfg->fc_src_len)
1763 goto out;
1764 #endif
1765 if (cfg->fc_ifindex) {
1766 err = -ENODEV;
1767 dev = dev_get_by_index(net, cfg->fc_ifindex);
1768 if (!dev)
1769 goto out;
1770 idev = in6_dev_get(dev);
1771 if (!idev)
1772 goto out;
1773 }
1774
1775 if (cfg->fc_metric == 0)
1776 cfg->fc_metric = IP6_RT_PRIO_USER;
1777
1778 err = -ENOBUFS;
1779 if (cfg->fc_nlinfo.nlh &&
1780 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1781 table = fib6_get_table(net, cfg->fc_table);
1782 if (!table) {
1783 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1784 table = fib6_new_table(net, cfg->fc_table);
1785 }
1786 } else {
1787 table = fib6_new_table(net, cfg->fc_table);
1788 }
1789
1790 if (!table)
1791 goto out;
1792
1793 rt = ip6_dst_alloc(net, NULL,
1794 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1795
1796 if (!rt) {
1797 err = -ENOMEM;
1798 goto out;
1799 }
1800
1801 if (cfg->fc_flags & RTF_EXPIRES)
1802 rt6_set_expires(rt, jiffies +
1803 clock_t_to_jiffies(cfg->fc_expires));
1804 else
1805 rt6_clean_expires(rt);
1806
1807 if (cfg->fc_protocol == RTPROT_UNSPEC)
1808 cfg->fc_protocol = RTPROT_BOOT;
1809 rt->rt6i_protocol = cfg->fc_protocol;
1810
1811 addr_type = ipv6_addr_type(&cfg->fc_dst);
1812
1813 if (addr_type & IPV6_ADDR_MULTICAST)
1814 rt->dst.input = ip6_mc_input;
1815 else if (cfg->fc_flags & RTF_LOCAL)
1816 rt->dst.input = ip6_input;
1817 else
1818 rt->dst.input = ip6_forward;
1819
1820 rt->dst.output = ip6_output;
1821
1822 if (cfg->fc_encap) {
1823 struct lwtunnel_state *lwtstate;
1824
1825 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1826 cfg->fc_encap, AF_INET6, cfg,
1827 &lwtstate);
1828 if (err)
1829 goto out;
1830 rt->dst.lwtstate = lwtstate_get(lwtstate);
1831 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1832 rt->dst.lwtstate->orig_output = rt->dst.output;
1833 rt->dst.output = lwtunnel_output;
1834 }
1835 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1836 rt->dst.lwtstate->orig_input = rt->dst.input;
1837 rt->dst.input = lwtunnel_input;
1838 }
1839 }
1840
1841 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1842 rt->rt6i_dst.plen = cfg->fc_dst_len;
1843 if (rt->rt6i_dst.plen == 128)
1844 rt->dst.flags |= DST_HOST;
1845
1846 #ifdef CONFIG_IPV6_SUBTREES
1847 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1848 rt->rt6i_src.plen = cfg->fc_src_len;
1849 #endif
1850
1851 rt->rt6i_metric = cfg->fc_metric;
1852
1853 /* We cannot add true routes via loopback here,
1854 they would result in kernel looping; promote them to reject routes
1855 */
1856 if ((cfg->fc_flags & RTF_REJECT) ||
1857 (dev && (dev->flags & IFF_LOOPBACK) &&
1858 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1859 !(cfg->fc_flags & RTF_LOCAL))) {
1860 /* hold loopback dev/idev if we haven't done so. */
1861 if (dev != net->loopback_dev) {
1862 if (dev) {
1863 dev_put(dev);
1864 in6_dev_put(idev);
1865 }
1866 dev = net->loopback_dev;
1867 dev_hold(dev);
1868 idev = in6_dev_get(dev);
1869 if (!idev) {
1870 err = -ENODEV;
1871 goto out;
1872 }
1873 }
1874 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1875 switch (cfg->fc_type) {
1876 case RTN_BLACKHOLE:
1877 rt->dst.error = -EINVAL;
1878 rt->dst.output = dst_discard_out;
1879 rt->dst.input = dst_discard;
1880 break;
1881 case RTN_PROHIBIT:
1882 rt->dst.error = -EACCES;
1883 rt->dst.output = ip6_pkt_prohibit_out;
1884 rt->dst.input = ip6_pkt_prohibit;
1885 break;
1886 case RTN_THROW:
1887 case RTN_UNREACHABLE:
1888 default:
1889 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1890 : (cfg->fc_type == RTN_UNREACHABLE)
1891 ? -EHOSTUNREACH : -ENETUNREACH;
1892 rt->dst.output = ip6_pkt_discard_out;
1893 rt->dst.input = ip6_pkt_discard;
1894 break;
1895 }
1896 goto install_route;
1897 }
1898
1899 if (cfg->fc_flags & RTF_GATEWAY) {
1900 const struct in6_addr *gw_addr;
1901 int gwa_type;
1902
1903 gw_addr = &cfg->fc_gateway;
1904 gwa_type = ipv6_addr_type(gw_addr);
1905
1906 /* if gw_addr is local we will fail to detect this in case
1907 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1908 * will return already-added prefix route via interface that
1909 * prefix route was assigned to, which might be non-loopback.
1910 */
1911 err = -EINVAL;
1912 if (ipv6_chk_addr_and_flags(net, gw_addr,
1913 gwa_type & IPV6_ADDR_LINKLOCAL ?
1914 dev : NULL, 0, 0))
1915 goto out;
1916
1917 rt->rt6i_gateway = *gw_addr;
1918
1919 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1920 struct rt6_info *grt;
1921
1922 /* IPv6 strictly inhibits using not link-local
1923 addresses as nexthop address.
1924 Otherwise, router will not able to send redirects.
1925 It is very good, but in some (rare!) circumstances
1926 (SIT, PtP, NBMA NOARP links) it is handy to allow
1927 some exceptions. --ANK
1928 */
1929 if (!(gwa_type & IPV6_ADDR_UNICAST))
1930 goto out;
1931
1932 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1933
1934 err = -EHOSTUNREACH;
1935 if (!grt)
1936 goto out;
1937 if (dev) {
1938 if (dev != grt->dst.dev) {
1939 ip6_rt_put(grt);
1940 goto out;
1941 }
1942 } else {
1943 dev = grt->dst.dev;
1944 idev = grt->rt6i_idev;
1945 dev_hold(dev);
1946 in6_dev_hold(grt->rt6i_idev);
1947 }
1948 if (!(grt->rt6i_flags & RTF_GATEWAY))
1949 err = 0;
1950 ip6_rt_put(grt);
1951
1952 if (err)
1953 goto out;
1954 }
1955 err = -EINVAL;
1956 if (!dev || (dev->flags & IFF_LOOPBACK))
1957 goto out;
1958 }
1959
1960 err = -ENODEV;
1961 if (!dev)
1962 goto out;
1963
1964 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1965 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1966 err = -EINVAL;
1967 goto out;
1968 }
1969 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1970 rt->rt6i_prefsrc.plen = 128;
1971 } else
1972 rt->rt6i_prefsrc.plen = 0;
1973
1974 rt->rt6i_flags = cfg->fc_flags;
1975
1976 install_route:
1977 rt->dst.dev = dev;
1978 rt->rt6i_idev = idev;
1979 rt->rt6i_table = table;
1980
1981 cfg->fc_nlinfo.nl_net = dev_net(dev);
1982
1983 return rt;
1984 out:
1985 if (dev)
1986 dev_put(dev);
1987 if (idev)
1988 in6_dev_put(idev);
1989 if (rt)
1990 dst_free(&rt->dst);
1991
1992 return ERR_PTR(err);
1993 }
1994
1995 int ip6_route_add(struct fib6_config *cfg)
1996 {
1997 struct mx6_config mxc = { .mx = NULL, };
1998 struct rt6_info *rt;
1999 int err;
2000
2001 rt = ip6_route_info_create(cfg);
2002 if (IS_ERR(rt)) {
2003 err = PTR_ERR(rt);
2004 rt = NULL;
2005 goto out;
2006 }
2007
2008 err = ip6_convert_metrics(&mxc, cfg);
2009 if (err)
2010 goto out;
2011
2012 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2013
2014 kfree(mxc.mx);
2015
2016 return err;
2017 out:
2018 if (rt)
2019 dst_free(&rt->dst);
2020
2021 return err;
2022 }
2023
2024 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2025 {
2026 int err;
2027 struct fib6_table *table;
2028 struct net *net = dev_net(rt->dst.dev);
2029
2030 if (rt == net->ipv6.ip6_null_entry ||
2031 rt->dst.flags & DST_NOCACHE) {
2032 err = -ENOENT;
2033 goto out;
2034 }
2035
2036 table = rt->rt6i_table;
2037 write_lock_bh(&table->tb6_lock);
2038 err = fib6_del(rt, info);
2039 write_unlock_bh(&table->tb6_lock);
2040
2041 out:
2042 ip6_rt_put(rt);
2043 return err;
2044 }
2045
2046 int ip6_del_rt(struct rt6_info *rt)
2047 {
2048 struct nl_info info = {
2049 .nl_net = dev_net(rt->dst.dev),
2050 };
2051 return __ip6_del_rt(rt, &info);
2052 }
2053
2054 static int ip6_route_del(struct fib6_config *cfg)
2055 {
2056 struct fib6_table *table;
2057 struct fib6_node *fn;
2058 struct rt6_info *rt;
2059 int err = -ESRCH;
2060
2061 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2062 if (!table)
2063 return err;
2064
2065 read_lock_bh(&table->tb6_lock);
2066
2067 fn = fib6_locate(&table->tb6_root,
2068 &cfg->fc_dst, cfg->fc_dst_len,
2069 &cfg->fc_src, cfg->fc_src_len);
2070
2071 if (fn) {
2072 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2073 if ((rt->rt6i_flags & RTF_CACHE) &&
2074 !(cfg->fc_flags & RTF_CACHE))
2075 continue;
2076 if (cfg->fc_ifindex &&
2077 (!rt->dst.dev ||
2078 rt->dst.dev->ifindex != cfg->fc_ifindex))
2079 continue;
2080 if (cfg->fc_flags & RTF_GATEWAY &&
2081 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2082 continue;
2083 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2084 continue;
2085 dst_hold(&rt->dst);
2086 read_unlock_bh(&table->tb6_lock);
2087
2088 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2089 }
2090 }
2091 read_unlock_bh(&table->tb6_lock);
2092
2093 return err;
2094 }
2095
2096 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2097 {
2098 struct netevent_redirect netevent;
2099 struct rt6_info *rt, *nrt = NULL;
2100 struct ndisc_options ndopts;
2101 struct inet6_dev *in6_dev;
2102 struct neighbour *neigh;
2103 struct rd_msg *msg;
2104 int optlen, on_link;
2105 u8 *lladdr;
2106
2107 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2108 optlen -= sizeof(*msg);
2109
2110 if (optlen < 0) {
2111 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2112 return;
2113 }
2114
2115 msg = (struct rd_msg *)icmp6_hdr(skb);
2116
2117 if (ipv6_addr_is_multicast(&msg->dest)) {
2118 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2119 return;
2120 }
2121
2122 on_link = 0;
2123 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2124 on_link = 1;
2125 } else if (ipv6_addr_type(&msg->target) !=
2126 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2127 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2128 return;
2129 }
2130
2131 in6_dev = __in6_dev_get(skb->dev);
2132 if (!in6_dev)
2133 return;
2134 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2135 return;
2136
2137 /* RFC2461 8.1:
2138 * The IP source address of the Redirect MUST be the same as the current
2139 * first-hop router for the specified ICMP Destination Address.
2140 */
2141
2142 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2143 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2144 return;
2145 }
2146
2147 lladdr = NULL;
2148 if (ndopts.nd_opts_tgt_lladdr) {
2149 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2150 skb->dev);
2151 if (!lladdr) {
2152 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2153 return;
2154 }
2155 }
2156
2157 rt = (struct rt6_info *) dst;
2158 if (rt->rt6i_flags & RTF_REJECT) {
2159 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2160 return;
2161 }
2162
2163 /* Redirect received -> path was valid.
2164 * Look, redirects are sent only in response to data packets,
2165 * so that this nexthop apparently is reachable. --ANK
2166 */
2167 dst_confirm(&rt->dst);
2168
2169 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2170 if (!neigh)
2171 return;
2172
2173 /*
2174 * We have finally decided to accept it.
2175 */
2176
2177 neigh_update(neigh, lladdr, NUD_STALE,
2178 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2179 NEIGH_UPDATE_F_OVERRIDE|
2180 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2181 NEIGH_UPDATE_F_ISROUTER))
2182 );
2183
2184 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2185 if (!nrt)
2186 goto out;
2187
2188 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2189 if (on_link)
2190 nrt->rt6i_flags &= ~RTF_GATEWAY;
2191
2192 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2193
2194 if (ip6_ins_rt(nrt))
2195 goto out;
2196
2197 netevent.old = &rt->dst;
2198 netevent.new = &nrt->dst;
2199 netevent.daddr = &msg->dest;
2200 netevent.neigh = neigh;
2201 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2202
2203 if (rt->rt6i_flags & RTF_CACHE) {
2204 rt = (struct rt6_info *) dst_clone(&rt->dst);
2205 ip6_del_rt(rt);
2206 }
2207
2208 out:
2209 neigh_release(neigh);
2210 }
2211
2212 /*
2213 * Misc support functions
2214 */
2215
2216 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2217 {
2218 BUG_ON(from->dst.from);
2219
2220 rt->rt6i_flags &= ~RTF_EXPIRES;
2221 dst_hold(&from->dst);
2222 rt->dst.from = &from->dst;
2223 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2224 }
2225
2226 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2227 {
2228 rt->dst.input = ort->dst.input;
2229 rt->dst.output = ort->dst.output;
2230 rt->rt6i_dst = ort->rt6i_dst;
2231 rt->dst.error = ort->dst.error;
2232 rt->rt6i_idev = ort->rt6i_idev;
2233 if (rt->rt6i_idev)
2234 in6_dev_hold(rt->rt6i_idev);
2235 rt->dst.lastuse = jiffies;
2236 rt->rt6i_gateway = ort->rt6i_gateway;
2237 rt->rt6i_flags = ort->rt6i_flags;
2238 rt6_set_from(rt, ort);
2239 rt->rt6i_metric = ort->rt6i_metric;
2240 #ifdef CONFIG_IPV6_SUBTREES
2241 rt->rt6i_src = ort->rt6i_src;
2242 #endif
2243 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2244 rt->rt6i_table = ort->rt6i_table;
2245 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2246 }
2247
2248 #ifdef CONFIG_IPV6_ROUTE_INFO
2249 static struct rt6_info *rt6_get_route_info(struct net *net,
2250 const struct in6_addr *prefix, int prefixlen,
2251 const struct in6_addr *gwaddr, int ifindex)
2252 {
2253 struct fib6_node *fn;
2254 struct rt6_info *rt = NULL;
2255 struct fib6_table *table;
2256
2257 table = fib6_get_table(net, RT6_TABLE_INFO);
2258 if (!table)
2259 return NULL;
2260
2261 read_lock_bh(&table->tb6_lock);
2262 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2263 if (!fn)
2264 goto out;
2265
2266 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2267 if (rt->dst.dev->ifindex != ifindex)
2268 continue;
2269 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2270 continue;
2271 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2272 continue;
2273 dst_hold(&rt->dst);
2274 break;
2275 }
2276 out:
2277 read_unlock_bh(&table->tb6_lock);
2278 return rt;
2279 }
2280
2281 static struct rt6_info *rt6_add_route_info(struct net *net,
2282 const struct in6_addr *prefix, int prefixlen,
2283 const struct in6_addr *gwaddr, int ifindex,
2284 unsigned int pref)
2285 {
2286 struct fib6_config cfg = {
2287 .fc_metric = IP6_RT_PRIO_USER,
2288 .fc_ifindex = ifindex,
2289 .fc_dst_len = prefixlen,
2290 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2291 RTF_UP | RTF_PREF(pref),
2292 .fc_nlinfo.portid = 0,
2293 .fc_nlinfo.nlh = NULL,
2294 .fc_nlinfo.nl_net = net,
2295 };
2296
2297 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
2298 cfg.fc_dst = *prefix;
2299 cfg.fc_gateway = *gwaddr;
2300
2301 /* We should treat it as a default route if prefix length is 0. */
2302 if (!prefixlen)
2303 cfg.fc_flags |= RTF_DEFAULT;
2304
2305 ip6_route_add(&cfg);
2306
2307 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2308 }
2309 #endif
2310
2311 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2312 {
2313 struct rt6_info *rt;
2314 struct fib6_table *table;
2315
2316 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2317 if (!table)
2318 return NULL;
2319
2320 read_lock_bh(&table->tb6_lock);
2321 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2322 if (dev == rt->dst.dev &&
2323 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2324 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2325 break;
2326 }
2327 if (rt)
2328 dst_hold(&rt->dst);
2329 read_unlock_bh(&table->tb6_lock);
2330 return rt;
2331 }
2332
2333 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2334 struct net_device *dev,
2335 unsigned int pref)
2336 {
2337 struct fib6_config cfg = {
2338 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2339 .fc_metric = IP6_RT_PRIO_USER,
2340 .fc_ifindex = dev->ifindex,
2341 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2342 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2343 .fc_nlinfo.portid = 0,
2344 .fc_nlinfo.nlh = NULL,
2345 .fc_nlinfo.nl_net = dev_net(dev),
2346 };
2347
2348 cfg.fc_gateway = *gwaddr;
2349
2350 ip6_route_add(&cfg);
2351
2352 return rt6_get_dflt_router(gwaddr, dev);
2353 }
2354
2355 void rt6_purge_dflt_routers(struct net *net)
2356 {
2357 struct rt6_info *rt;
2358 struct fib6_table *table;
2359
2360 /* NOTE: Keep consistent with rt6_get_dflt_router */
2361 table = fib6_get_table(net, RT6_TABLE_DFLT);
2362 if (!table)
2363 return;
2364
2365 restart:
2366 read_lock_bh(&table->tb6_lock);
2367 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2368 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2369 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2370 dst_hold(&rt->dst);
2371 read_unlock_bh(&table->tb6_lock);
2372 ip6_del_rt(rt);
2373 goto restart;
2374 }
2375 }
2376 read_unlock_bh(&table->tb6_lock);
2377 }
2378
2379 static void rtmsg_to_fib6_config(struct net *net,
2380 struct in6_rtmsg *rtmsg,
2381 struct fib6_config *cfg)
2382 {
2383 memset(cfg, 0, sizeof(*cfg));
2384
2385 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2386 : RT6_TABLE_MAIN;
2387 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2388 cfg->fc_metric = rtmsg->rtmsg_metric;
2389 cfg->fc_expires = rtmsg->rtmsg_info;
2390 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2391 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2392 cfg->fc_flags = rtmsg->rtmsg_flags;
2393
2394 cfg->fc_nlinfo.nl_net = net;
2395
2396 cfg->fc_dst = rtmsg->rtmsg_dst;
2397 cfg->fc_src = rtmsg->rtmsg_src;
2398 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2399 }
2400
2401 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2402 {
2403 struct fib6_config cfg;
2404 struct in6_rtmsg rtmsg;
2405 int err;
2406
2407 switch (cmd) {
2408 case SIOCADDRT: /* Add a route */
2409 case SIOCDELRT: /* Delete a route */
2410 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2411 return -EPERM;
2412 err = copy_from_user(&rtmsg, arg,
2413 sizeof(struct in6_rtmsg));
2414 if (err)
2415 return -EFAULT;
2416
2417 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2418
2419 rtnl_lock();
2420 switch (cmd) {
2421 case SIOCADDRT:
2422 err = ip6_route_add(&cfg);
2423 break;
2424 case SIOCDELRT:
2425 err = ip6_route_del(&cfg);
2426 break;
2427 default:
2428 err = -EINVAL;
2429 }
2430 rtnl_unlock();
2431
2432 return err;
2433 }
2434
2435 return -EINVAL;
2436 }
2437
2438 /*
2439 * Drop the packet on the floor
2440 */
2441
2442 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2443 {
2444 int type;
2445 struct dst_entry *dst = skb_dst(skb);
2446 switch (ipstats_mib_noroutes) {
2447 case IPSTATS_MIB_INNOROUTES:
2448 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2449 if (type == IPV6_ADDR_ANY) {
2450 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2451 IPSTATS_MIB_INADDRERRORS);
2452 break;
2453 }
2454 /* FALLTHROUGH */
2455 case IPSTATS_MIB_OUTNOROUTES:
2456 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2457 ipstats_mib_noroutes);
2458 break;
2459 }
2460 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2461 kfree_skb(skb);
2462 return 0;
2463 }
2464
2465 static int ip6_pkt_discard(struct sk_buff *skb)
2466 {
2467 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2468 }
2469
2470 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2471 {
2472 skb->dev = skb_dst(skb)->dev;
2473 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2474 }
2475
2476 static int ip6_pkt_prohibit(struct sk_buff *skb)
2477 {
2478 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2479 }
2480
2481 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2482 {
2483 skb->dev = skb_dst(skb)->dev;
2484 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2485 }
2486
2487 /*
2488 * Allocate a dst for local (unicast / anycast) address.
2489 */
2490
2491 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2492 const struct in6_addr *addr,
2493 bool anycast)
2494 {
2495 u32 tb_id;
2496 struct net *net = dev_net(idev->dev);
2497 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2498 DST_NOCOUNT);
2499 if (!rt)
2500 return ERR_PTR(-ENOMEM);
2501
2502 in6_dev_hold(idev);
2503
2504 rt->dst.flags |= DST_HOST;
2505 rt->dst.input = ip6_input;
2506 rt->dst.output = ip6_output;
2507 rt->rt6i_idev = idev;
2508
2509 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2510 if (anycast)
2511 rt->rt6i_flags |= RTF_ANYCAST;
2512 else
2513 rt->rt6i_flags |= RTF_LOCAL;
2514
2515 rt->rt6i_gateway = *addr;
2516 rt->rt6i_dst.addr = *addr;
2517 rt->rt6i_dst.plen = 128;
2518 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2519 rt->rt6i_table = fib6_get_table(net, tb_id);
2520 rt->dst.flags |= DST_NOCACHE;
2521
2522 atomic_set(&rt->dst.__refcnt, 1);
2523
2524 return rt;
2525 }
2526
2527 int ip6_route_get_saddr(struct net *net,
2528 struct rt6_info *rt,
2529 const struct in6_addr *daddr,
2530 unsigned int prefs,
2531 struct in6_addr *saddr)
2532 {
2533 struct inet6_dev *idev =
2534 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2535 int err = 0;
2536 if (rt && rt->rt6i_prefsrc.plen)
2537 *saddr = rt->rt6i_prefsrc.addr;
2538 else
2539 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2540 daddr, prefs, saddr);
2541 return err;
2542 }
2543
2544 /* remove deleted ip from prefsrc entries */
2545 struct arg_dev_net_ip {
2546 struct net_device *dev;
2547 struct net *net;
2548 struct in6_addr *addr;
2549 };
2550
2551 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2552 {
2553 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2554 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2555 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2556
2557 if (((void *)rt->dst.dev == dev || !dev) &&
2558 rt != net->ipv6.ip6_null_entry &&
2559 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2560 /* remove prefsrc entry */
2561 rt->rt6i_prefsrc.plen = 0;
2562 }
2563 return 0;
2564 }
2565
2566 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2567 {
2568 struct net *net = dev_net(ifp->idev->dev);
2569 struct arg_dev_net_ip adni = {
2570 .dev = ifp->idev->dev,
2571 .net = net,
2572 .addr = &ifp->addr,
2573 };
2574 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2575 }
2576
2577 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2578 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2579
2580 /* Remove routers and update dst entries when gateway turn into host. */
2581 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2582 {
2583 struct in6_addr *gateway = (struct in6_addr *)arg;
2584
2585 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2586 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2587 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2588 return -1;
2589 }
2590 return 0;
2591 }
2592
2593 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2594 {
2595 fib6_clean_all(net, fib6_clean_tohost, gateway);
2596 }
2597
2598 struct arg_dev_net {
2599 struct net_device *dev;
2600 struct net *net;
2601 };
2602
2603 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2604 {
2605 const struct arg_dev_net *adn = arg;
2606 const struct net_device *dev = adn->dev;
2607
2608 if ((rt->dst.dev == dev || !dev) &&
2609 rt != adn->net->ipv6.ip6_null_entry)
2610 return -1;
2611
2612 return 0;
2613 }
2614
2615 void rt6_ifdown(struct net *net, struct net_device *dev)
2616 {
2617 struct arg_dev_net adn = {
2618 .dev = dev,
2619 .net = net,
2620 };
2621
2622 fib6_clean_all(net, fib6_ifdown, &adn);
2623 icmp6_clean_all(fib6_ifdown, &adn);
2624 if (dev)
2625 rt6_uncached_list_flush_dev(net, dev);
2626 }
2627
2628 struct rt6_mtu_change_arg {
2629 struct net_device *dev;
2630 unsigned int mtu;
2631 };
2632
2633 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2634 {
2635 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2636 struct inet6_dev *idev;
2637
2638 /* In IPv6 pmtu discovery is not optional,
2639 so that RTAX_MTU lock cannot disable it.
2640 We still use this lock to block changes
2641 caused by addrconf/ndisc.
2642 */
2643
2644 idev = __in6_dev_get(arg->dev);
2645 if (!idev)
2646 return 0;
2647
2648 /* For administrative MTU increase, there is no way to discover
2649 IPv6 PMTU increase, so PMTU increase should be updated here.
2650 Since RFC 1981 doesn't include administrative MTU increase
2651 update PMTU increase is a MUST. (i.e. jumbo frame)
2652 */
2653 /*
2654 If new MTU is less than route PMTU, this new MTU will be the
2655 lowest MTU in the path, update the route PMTU to reflect PMTU
2656 decreases; if new MTU is greater than route PMTU, and the
2657 old MTU is the lowest MTU in the path, update the route PMTU
2658 to reflect the increase. In this case if the other nodes' MTU
2659 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2660 PMTU discouvery.
2661 */
2662 if (rt->dst.dev == arg->dev &&
2663 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2664 if (rt->rt6i_flags & RTF_CACHE) {
2665 /* For RTF_CACHE with rt6i_pmtu == 0
2666 * (i.e. a redirected route),
2667 * the metrics of its rt->dst.from has already
2668 * been updated.
2669 */
2670 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2671 rt->rt6i_pmtu = arg->mtu;
2672 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2673 (dst_mtu(&rt->dst) < arg->mtu &&
2674 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2675 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2676 }
2677 }
2678 return 0;
2679 }
2680
2681 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2682 {
2683 struct rt6_mtu_change_arg arg = {
2684 .dev = dev,
2685 .mtu = mtu,
2686 };
2687
2688 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2689 }
2690
2691 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2692 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2693 [RTA_OIF] = { .type = NLA_U32 },
2694 [RTA_IIF] = { .type = NLA_U32 },
2695 [RTA_PRIORITY] = { .type = NLA_U32 },
2696 [RTA_METRICS] = { .type = NLA_NESTED },
2697 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2698 [RTA_PREF] = { .type = NLA_U8 },
2699 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2700 [RTA_ENCAP] = { .type = NLA_NESTED },
2701 };
2702
2703 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2704 struct fib6_config *cfg)
2705 {
2706 struct rtmsg *rtm;
2707 struct nlattr *tb[RTA_MAX+1];
2708 unsigned int pref;
2709 int err;
2710
2711 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2712 if (err < 0)
2713 goto errout;
2714
2715 err = -EINVAL;
2716 rtm = nlmsg_data(nlh);
2717 memset(cfg, 0, sizeof(*cfg));
2718
2719 cfg->fc_table = rtm->rtm_table;
2720 cfg->fc_dst_len = rtm->rtm_dst_len;
2721 cfg->fc_src_len = rtm->rtm_src_len;
2722 cfg->fc_flags = RTF_UP;
2723 cfg->fc_protocol = rtm->rtm_protocol;
2724 cfg->fc_type = rtm->rtm_type;
2725
2726 if (rtm->rtm_type == RTN_UNREACHABLE ||
2727 rtm->rtm_type == RTN_BLACKHOLE ||
2728 rtm->rtm_type == RTN_PROHIBIT ||
2729 rtm->rtm_type == RTN_THROW)
2730 cfg->fc_flags |= RTF_REJECT;
2731
2732 if (rtm->rtm_type == RTN_LOCAL)
2733 cfg->fc_flags |= RTF_LOCAL;
2734
2735 if (rtm->rtm_flags & RTM_F_CLONED)
2736 cfg->fc_flags |= RTF_CACHE;
2737
2738 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2739 cfg->fc_nlinfo.nlh = nlh;
2740 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2741
2742 if (tb[RTA_GATEWAY]) {
2743 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2744 cfg->fc_flags |= RTF_GATEWAY;
2745 }
2746
2747 if (tb[RTA_DST]) {
2748 int plen = (rtm->rtm_dst_len + 7) >> 3;
2749
2750 if (nla_len(tb[RTA_DST]) < plen)
2751 goto errout;
2752
2753 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2754 }
2755
2756 if (tb[RTA_SRC]) {
2757 int plen = (rtm->rtm_src_len + 7) >> 3;
2758
2759 if (nla_len(tb[RTA_SRC]) < plen)
2760 goto errout;
2761
2762 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2763 }
2764
2765 if (tb[RTA_PREFSRC])
2766 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2767
2768 if (tb[RTA_OIF])
2769 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2770
2771 if (tb[RTA_PRIORITY])
2772 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2773
2774 if (tb[RTA_METRICS]) {
2775 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2776 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2777 }
2778
2779 if (tb[RTA_TABLE])
2780 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2781
2782 if (tb[RTA_MULTIPATH]) {
2783 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2784 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2785 }
2786
2787 if (tb[RTA_PREF]) {
2788 pref = nla_get_u8(tb[RTA_PREF]);
2789 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2790 pref != ICMPV6_ROUTER_PREF_HIGH)
2791 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2792 cfg->fc_flags |= RTF_PREF(pref);
2793 }
2794
2795 if (tb[RTA_ENCAP])
2796 cfg->fc_encap = tb[RTA_ENCAP];
2797
2798 if (tb[RTA_ENCAP_TYPE])
2799 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2800
2801 err = 0;
2802 errout:
2803 return err;
2804 }
2805
2806 struct rt6_nh {
2807 struct rt6_info *rt6_info;
2808 struct fib6_config r_cfg;
2809 struct mx6_config mxc;
2810 struct list_head next;
2811 };
2812
2813 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2814 {
2815 struct rt6_nh *nh;
2816
2817 list_for_each_entry(nh, rt6_nh_list, next) {
2818 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2819 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2820 nh->r_cfg.fc_ifindex);
2821 }
2822 }
2823
2824 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2825 struct rt6_info *rt, struct fib6_config *r_cfg)
2826 {
2827 struct rt6_nh *nh;
2828 struct rt6_info *rtnh;
2829 int err = -EEXIST;
2830
2831 list_for_each_entry(nh, rt6_nh_list, next) {
2832 /* check if rt6_info already exists */
2833 rtnh = nh->rt6_info;
2834
2835 if (rtnh->dst.dev == rt->dst.dev &&
2836 rtnh->rt6i_idev == rt->rt6i_idev &&
2837 ipv6_addr_equal(&rtnh->rt6i_gateway,
2838 &rt->rt6i_gateway))
2839 return err;
2840 }
2841
2842 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2843 if (!nh)
2844 return -ENOMEM;
2845 nh->rt6_info = rt;
2846 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2847 if (err) {
2848 kfree(nh);
2849 return err;
2850 }
2851 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2852 list_add_tail(&nh->next, rt6_nh_list);
2853
2854 return 0;
2855 }
2856
2857 static int ip6_route_multipath_add(struct fib6_config *cfg)
2858 {
2859 struct fib6_config r_cfg;
2860 struct rtnexthop *rtnh;
2861 struct rt6_info *rt;
2862 struct rt6_nh *err_nh;
2863 struct rt6_nh *nh, *nh_safe;
2864 int remaining;
2865 int attrlen;
2866 int err = 1;
2867 int nhn = 0;
2868 int replace = (cfg->fc_nlinfo.nlh &&
2869 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2870 LIST_HEAD(rt6_nh_list);
2871
2872 remaining = cfg->fc_mp_len;
2873 rtnh = (struct rtnexthop *)cfg->fc_mp;
2874
2875 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2876 * rt6_info structs per nexthop
2877 */
2878 while (rtnh_ok(rtnh, remaining)) {
2879 memcpy(&r_cfg, cfg, sizeof(*cfg));
2880 if (rtnh->rtnh_ifindex)
2881 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2882
2883 attrlen = rtnh_attrlen(rtnh);
2884 if (attrlen > 0) {
2885 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2886
2887 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2888 if (nla) {
2889 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2890 r_cfg.fc_flags |= RTF_GATEWAY;
2891 }
2892 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2893 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2894 if (nla)
2895 r_cfg.fc_encap_type = nla_get_u16(nla);
2896 }
2897
2898 rt = ip6_route_info_create(&r_cfg);
2899 if (IS_ERR(rt)) {
2900 err = PTR_ERR(rt);
2901 rt = NULL;
2902 goto cleanup;
2903 }
2904
2905 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2906 if (err) {
2907 dst_free(&rt->dst);
2908 goto cleanup;
2909 }
2910
2911 rtnh = rtnh_next(rtnh, &remaining);
2912 }
2913
2914 err_nh = NULL;
2915 list_for_each_entry(nh, &rt6_nh_list, next) {
2916 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2917 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2918 nh->rt6_info = NULL;
2919 if (err) {
2920 if (replace && nhn)
2921 ip6_print_replace_route_err(&rt6_nh_list);
2922 err_nh = nh;
2923 goto add_errout;
2924 }
2925
2926 /* Because each route is added like a single route we remove
2927 * these flags after the first nexthop: if there is a collision,
2928 * we have already failed to add the first nexthop:
2929 * fib6_add_rt2node() has rejected it; when replacing, old
2930 * nexthops have been replaced by first new, the rest should
2931 * be added to it.
2932 */
2933 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2934 NLM_F_REPLACE);
2935 nhn++;
2936 }
2937
2938 goto cleanup;
2939
2940 add_errout:
2941 /* Delete routes that were already added */
2942 list_for_each_entry(nh, &rt6_nh_list, next) {
2943 if (err_nh == nh)
2944 break;
2945 ip6_route_del(&nh->r_cfg);
2946 }
2947
2948 cleanup:
2949 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2950 if (nh->rt6_info)
2951 dst_free(&nh->rt6_info->dst);
2952 kfree(nh->mxc.mx);
2953 list_del(&nh->next);
2954 kfree(nh);
2955 }
2956
2957 return err;
2958 }
2959
2960 static int ip6_route_multipath_del(struct fib6_config *cfg)
2961 {
2962 struct fib6_config r_cfg;
2963 struct rtnexthop *rtnh;
2964 int remaining;
2965 int attrlen;
2966 int err = 1, last_err = 0;
2967
2968 remaining = cfg->fc_mp_len;
2969 rtnh = (struct rtnexthop *)cfg->fc_mp;
2970
2971 /* Parse a Multipath Entry */
2972 while (rtnh_ok(rtnh, remaining)) {
2973 memcpy(&r_cfg, cfg, sizeof(*cfg));
2974 if (rtnh->rtnh_ifindex)
2975 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2976
2977 attrlen = rtnh_attrlen(rtnh);
2978 if (attrlen > 0) {
2979 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2980
2981 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2982 if (nla) {
2983 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2984 r_cfg.fc_flags |= RTF_GATEWAY;
2985 }
2986 }
2987 err = ip6_route_del(&r_cfg);
2988 if (err)
2989 last_err = err;
2990
2991 rtnh = rtnh_next(rtnh, &remaining);
2992 }
2993
2994 return last_err;
2995 }
2996
2997 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2998 {
2999 struct fib6_config cfg;
3000 int err;
3001
3002 err = rtm_to_fib6_config(skb, nlh, &cfg);
3003 if (err < 0)
3004 return err;
3005
3006 if (cfg.fc_mp)
3007 return ip6_route_multipath_del(&cfg);
3008 else
3009 return ip6_route_del(&cfg);
3010 }
3011
3012 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3013 {
3014 struct fib6_config cfg;
3015 int err;
3016
3017 err = rtm_to_fib6_config(skb, nlh, &cfg);
3018 if (err < 0)
3019 return err;
3020
3021 if (cfg.fc_mp)
3022 return ip6_route_multipath_add(&cfg);
3023 else
3024 return ip6_route_add(&cfg);
3025 }
3026
3027 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3028 {
3029 return NLMSG_ALIGN(sizeof(struct rtmsg))
3030 + nla_total_size(16) /* RTA_SRC */
3031 + nla_total_size(16) /* RTA_DST */
3032 + nla_total_size(16) /* RTA_GATEWAY */
3033 + nla_total_size(16) /* RTA_PREFSRC */
3034 + nla_total_size(4) /* RTA_TABLE */
3035 + nla_total_size(4) /* RTA_IIF */
3036 + nla_total_size(4) /* RTA_OIF */
3037 + nla_total_size(4) /* RTA_PRIORITY */
3038 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3039 + nla_total_size(sizeof(struct rta_cacheinfo))
3040 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3041 + nla_total_size(1) /* RTA_PREF */
3042 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3043 }
3044
3045 static int rt6_fill_node(struct net *net,
3046 struct sk_buff *skb, struct rt6_info *rt,
3047 struct in6_addr *dst, struct in6_addr *src,
3048 int iif, int type, u32 portid, u32 seq,
3049 int prefix, int nowait, unsigned int flags)
3050 {
3051 u32 metrics[RTAX_MAX];
3052 struct rtmsg *rtm;
3053 struct nlmsghdr *nlh;
3054 long expires;
3055 u32 table;
3056
3057 if (prefix) { /* user wants prefix routes only */
3058 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3059 /* success since this is not a prefix route */
3060 return 1;
3061 }
3062 }
3063
3064 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3065 if (!nlh)
3066 return -EMSGSIZE;
3067
3068 rtm = nlmsg_data(nlh);
3069 rtm->rtm_family = AF_INET6;
3070 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3071 rtm->rtm_src_len = rt->rt6i_src.plen;
3072 rtm->rtm_tos = 0;
3073 if (rt->rt6i_table)
3074 table = rt->rt6i_table->tb6_id;
3075 else
3076 table = RT6_TABLE_UNSPEC;
3077 rtm->rtm_table = table;
3078 if (nla_put_u32(skb, RTA_TABLE, table))
3079 goto nla_put_failure;
3080 if (rt->rt6i_flags & RTF_REJECT) {
3081 switch (rt->dst.error) {
3082 case -EINVAL:
3083 rtm->rtm_type = RTN_BLACKHOLE;
3084 break;
3085 case -EACCES:
3086 rtm->rtm_type = RTN_PROHIBIT;
3087 break;
3088 case -EAGAIN:
3089 rtm->rtm_type = RTN_THROW;
3090 break;
3091 default:
3092 rtm->rtm_type = RTN_UNREACHABLE;
3093 break;
3094 }
3095 }
3096 else if (rt->rt6i_flags & RTF_LOCAL)
3097 rtm->rtm_type = RTN_LOCAL;
3098 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3099 rtm->rtm_type = RTN_LOCAL;
3100 else
3101 rtm->rtm_type = RTN_UNICAST;
3102 rtm->rtm_flags = 0;
3103 if (!netif_carrier_ok(rt->dst.dev)) {
3104 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3105 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3106 rtm->rtm_flags |= RTNH_F_DEAD;
3107 }
3108 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3109 rtm->rtm_protocol = rt->rt6i_protocol;
3110 if (rt->rt6i_flags & RTF_DYNAMIC)
3111 rtm->rtm_protocol = RTPROT_REDIRECT;
3112 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3113 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3114 rtm->rtm_protocol = RTPROT_RA;
3115 else
3116 rtm->rtm_protocol = RTPROT_KERNEL;
3117 }
3118
3119 if (rt->rt6i_flags & RTF_CACHE)
3120 rtm->rtm_flags |= RTM_F_CLONED;
3121
3122 if (dst) {
3123 if (nla_put_in6_addr(skb, RTA_DST, dst))
3124 goto nla_put_failure;
3125 rtm->rtm_dst_len = 128;
3126 } else if (rtm->rtm_dst_len)
3127 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3128 goto nla_put_failure;
3129 #ifdef CONFIG_IPV6_SUBTREES
3130 if (src) {
3131 if (nla_put_in6_addr(skb, RTA_SRC, src))
3132 goto nla_put_failure;
3133 rtm->rtm_src_len = 128;
3134 } else if (rtm->rtm_src_len &&
3135 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3136 goto nla_put_failure;
3137 #endif
3138 if (iif) {
3139 #ifdef CONFIG_IPV6_MROUTE
3140 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3141 int err = ip6mr_get_route(net, skb, rtm, nowait);
3142 if (err <= 0) {
3143 if (!nowait) {
3144 if (err == 0)
3145 return 0;
3146 goto nla_put_failure;
3147 } else {
3148 if (err == -EMSGSIZE)
3149 goto nla_put_failure;
3150 }
3151 }
3152 } else
3153 #endif
3154 if (nla_put_u32(skb, RTA_IIF, iif))
3155 goto nla_put_failure;
3156 } else if (dst) {
3157 struct in6_addr saddr_buf;
3158 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3159 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3160 goto nla_put_failure;
3161 }
3162
3163 if (rt->rt6i_prefsrc.plen) {
3164 struct in6_addr saddr_buf;
3165 saddr_buf = rt->rt6i_prefsrc.addr;
3166 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3167 goto nla_put_failure;
3168 }
3169
3170 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3171 if (rt->rt6i_pmtu)
3172 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3173 if (rtnetlink_put_metrics(skb, metrics) < 0)
3174 goto nla_put_failure;
3175
3176 if (rt->rt6i_flags & RTF_GATEWAY) {
3177 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3178 goto nla_put_failure;
3179 }
3180
3181 if (rt->dst.dev &&
3182 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3183 goto nla_put_failure;
3184 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3185 goto nla_put_failure;
3186
3187 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3188
3189 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3190 goto nla_put_failure;
3191
3192 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3193 goto nla_put_failure;
3194
3195 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3196
3197 nlmsg_end(skb, nlh);
3198 return 0;
3199
3200 nla_put_failure:
3201 nlmsg_cancel(skb, nlh);
3202 return -EMSGSIZE;
3203 }
3204
3205 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3206 {
3207 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3208 int prefix;
3209
3210 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3211 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3212 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3213 } else
3214 prefix = 0;
3215
3216 return rt6_fill_node(arg->net,
3217 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3218 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3219 prefix, 0, NLM_F_MULTI);
3220 }
3221
3222 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3223 {
3224 struct net *net = sock_net(in_skb->sk);
3225 struct nlattr *tb[RTA_MAX+1];
3226 struct rt6_info *rt;
3227 struct sk_buff *skb;
3228 struct rtmsg *rtm;
3229 struct flowi6 fl6;
3230 int err, iif = 0, oif = 0;
3231
3232 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3233 if (err < 0)
3234 goto errout;
3235
3236 err = -EINVAL;
3237 memset(&fl6, 0, sizeof(fl6));
3238
3239 if (tb[RTA_SRC]) {
3240 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3241 goto errout;
3242
3243 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3244 }
3245
3246 if (tb[RTA_DST]) {
3247 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3248 goto errout;
3249
3250 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3251 }
3252
3253 if (tb[RTA_IIF])
3254 iif = nla_get_u32(tb[RTA_IIF]);
3255
3256 if (tb[RTA_OIF])
3257 oif = nla_get_u32(tb[RTA_OIF]);
3258
3259 if (tb[RTA_MARK])
3260 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3261
3262 if (iif) {
3263 struct net_device *dev;
3264 int flags = 0;
3265
3266 dev = __dev_get_by_index(net, iif);
3267 if (!dev) {
3268 err = -ENODEV;
3269 goto errout;
3270 }
3271
3272 fl6.flowi6_iif = iif;
3273
3274 if (!ipv6_addr_any(&fl6.saddr))
3275 flags |= RT6_LOOKUP_F_HAS_SADDR;
3276
3277 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3278 flags);
3279 } else {
3280 fl6.flowi6_oif = oif;
3281
3282 if (netif_index_is_l3_master(net, oif)) {
3283 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3284 FLOWI_FLAG_SKIP_NH_OIF;
3285 }
3286
3287 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3288 }
3289
3290 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3291 if (!skb) {
3292 ip6_rt_put(rt);
3293 err = -ENOBUFS;
3294 goto errout;
3295 }
3296
3297 /* Reserve room for dummy headers, this skb can pass
3298 through good chunk of routing engine.
3299 */
3300 skb_reset_mac_header(skb);
3301 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3302
3303 skb_dst_set(skb, &rt->dst);
3304
3305 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3306 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3307 nlh->nlmsg_seq, 0, 0, 0);
3308 if (err < 0) {
3309 kfree_skb(skb);
3310 goto errout;
3311 }
3312
3313 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3314 errout:
3315 return err;
3316 }
3317
3318 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3319 unsigned int nlm_flags)
3320 {
3321 struct sk_buff *skb;
3322 struct net *net = info->nl_net;
3323 u32 seq;
3324 int err;
3325
3326 err = -ENOBUFS;
3327 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3328
3329 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3330 if (!skb)
3331 goto errout;
3332
3333 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3334 event, info->portid, seq, 0, 0, nlm_flags);
3335 if (err < 0) {
3336 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3337 WARN_ON(err == -EMSGSIZE);
3338 kfree_skb(skb);
3339 goto errout;
3340 }
3341 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3342 info->nlh, gfp_any());
3343 return;
3344 errout:
3345 if (err < 0)
3346 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3347 }
3348
3349 static int ip6_route_dev_notify(struct notifier_block *this,
3350 unsigned long event, void *ptr)
3351 {
3352 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3353 struct net *net = dev_net(dev);
3354
3355 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3356 net->ipv6.ip6_null_entry->dst.dev = dev;
3357 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3358 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3359 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3360 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3361 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3362 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3363 #endif
3364 }
3365
3366 return NOTIFY_OK;
3367 }
3368
3369 /*
3370 * /proc
3371 */
3372
3373 #ifdef CONFIG_PROC_FS
3374
3375 static const struct file_operations ipv6_route_proc_fops = {
3376 .owner = THIS_MODULE,
3377 .open = ipv6_route_open,
3378 .read = seq_read,
3379 .llseek = seq_lseek,
3380 .release = seq_release_net,
3381 };
3382
3383 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3384 {
3385 struct net *net = (struct net *)seq->private;
3386 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3387 net->ipv6.rt6_stats->fib_nodes,
3388 net->ipv6.rt6_stats->fib_route_nodes,
3389 net->ipv6.rt6_stats->fib_rt_alloc,
3390 net->ipv6.rt6_stats->fib_rt_entries,
3391 net->ipv6.rt6_stats->fib_rt_cache,
3392 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3393 net->ipv6.rt6_stats->fib_discarded_routes);
3394
3395 return 0;
3396 }
3397
3398 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3399 {
3400 return single_open_net(inode, file, rt6_stats_seq_show);
3401 }
3402
3403 static const struct file_operations rt6_stats_seq_fops = {
3404 .owner = THIS_MODULE,
3405 .open = rt6_stats_seq_open,
3406 .read = seq_read,
3407 .llseek = seq_lseek,
3408 .release = single_release_net,
3409 };
3410 #endif /* CONFIG_PROC_FS */
3411
3412 #ifdef CONFIG_SYSCTL
3413
3414 static
3415 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3416 void __user *buffer, size_t *lenp, loff_t *ppos)
3417 {
3418 struct net *net;
3419 int delay;
3420 if (!write)
3421 return -EINVAL;
3422
3423 net = (struct net *)ctl->extra1;
3424 delay = net->ipv6.sysctl.flush_delay;
3425 proc_dointvec(ctl, write, buffer, lenp, ppos);
3426 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3427 return 0;
3428 }
3429
3430 struct ctl_table ipv6_route_table_template[] = {
3431 {
3432 .procname = "flush",
3433 .data = &init_net.ipv6.sysctl.flush_delay,
3434 .maxlen = sizeof(int),
3435 .mode = 0200,
3436 .proc_handler = ipv6_sysctl_rtcache_flush
3437 },
3438 {
3439 .procname = "gc_thresh",
3440 .data = &ip6_dst_ops_template.gc_thresh,
3441 .maxlen = sizeof(int),
3442 .mode = 0644,
3443 .proc_handler = proc_dointvec,
3444 },
3445 {
3446 .procname = "max_size",
3447 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3448 .maxlen = sizeof(int),
3449 .mode = 0644,
3450 .proc_handler = proc_dointvec,
3451 },
3452 {
3453 .procname = "gc_min_interval",
3454 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3455 .maxlen = sizeof(int),
3456 .mode = 0644,
3457 .proc_handler = proc_dointvec_jiffies,
3458 },
3459 {
3460 .procname = "gc_timeout",
3461 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3462 .maxlen = sizeof(int),
3463 .mode = 0644,
3464 .proc_handler = proc_dointvec_jiffies,
3465 },
3466 {
3467 .procname = "gc_interval",
3468 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3469 .maxlen = sizeof(int),
3470 .mode = 0644,
3471 .proc_handler = proc_dointvec_jiffies,
3472 },
3473 {
3474 .procname = "gc_elasticity",
3475 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3476 .maxlen = sizeof(int),
3477 .mode = 0644,
3478 .proc_handler = proc_dointvec,
3479 },
3480 {
3481 .procname = "mtu_expires",
3482 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3483 .maxlen = sizeof(int),
3484 .mode = 0644,
3485 .proc_handler = proc_dointvec_jiffies,
3486 },
3487 {
3488 .procname = "min_adv_mss",
3489 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3490 .maxlen = sizeof(int),
3491 .mode = 0644,
3492 .proc_handler = proc_dointvec,
3493 },
3494 {
3495 .procname = "gc_min_interval_ms",
3496 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3497 .maxlen = sizeof(int),
3498 .mode = 0644,
3499 .proc_handler = proc_dointvec_ms_jiffies,
3500 },
3501 { }
3502 };
3503
3504 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3505 {
3506 struct ctl_table *table;
3507
3508 table = kmemdup(ipv6_route_table_template,
3509 sizeof(ipv6_route_table_template),
3510 GFP_KERNEL);
3511
3512 if (table) {
3513 table[0].data = &net->ipv6.sysctl.flush_delay;
3514 table[0].extra1 = net;
3515 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3516 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3517 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3518 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3519 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3520 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3521 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3522 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3523 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3524
3525 /* Don't export sysctls to unprivileged users */
3526 if (net->user_ns != &init_user_ns)
3527 table[0].procname = NULL;
3528 }
3529
3530 return table;
3531 }
3532 #endif
3533
3534 static int __net_init ip6_route_net_init(struct net *net)
3535 {
3536 int ret = -ENOMEM;
3537
3538 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3539 sizeof(net->ipv6.ip6_dst_ops));
3540
3541 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3542 goto out_ip6_dst_ops;
3543
3544 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3545 sizeof(*net->ipv6.ip6_null_entry),
3546 GFP_KERNEL);
3547 if (!net->ipv6.ip6_null_entry)
3548 goto out_ip6_dst_entries;
3549 net->ipv6.ip6_null_entry->dst.path =
3550 (struct dst_entry *)net->ipv6.ip6_null_entry;
3551 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3552 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3553 ip6_template_metrics, true);
3554
3555 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3556 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3557 sizeof(*net->ipv6.ip6_prohibit_entry),
3558 GFP_KERNEL);
3559 if (!net->ipv6.ip6_prohibit_entry)
3560 goto out_ip6_null_entry;
3561 net->ipv6.ip6_prohibit_entry->dst.path =
3562 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3563 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3564 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3565 ip6_template_metrics, true);
3566
3567 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3568 sizeof(*net->ipv6.ip6_blk_hole_entry),
3569 GFP_KERNEL);
3570 if (!net->ipv6.ip6_blk_hole_entry)
3571 goto out_ip6_prohibit_entry;
3572 net->ipv6.ip6_blk_hole_entry->dst.path =
3573 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3574 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3575 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3576 ip6_template_metrics, true);
3577 #endif
3578
3579 net->ipv6.sysctl.flush_delay = 0;
3580 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3581 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3582 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3583 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3584 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3585 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3586 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3587
3588 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3589
3590 ret = 0;
3591 out:
3592 return ret;
3593
3594 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3595 out_ip6_prohibit_entry:
3596 kfree(net->ipv6.ip6_prohibit_entry);
3597 out_ip6_null_entry:
3598 kfree(net->ipv6.ip6_null_entry);
3599 #endif
3600 out_ip6_dst_entries:
3601 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3602 out_ip6_dst_ops:
3603 goto out;
3604 }
3605
3606 static void __net_exit ip6_route_net_exit(struct net *net)
3607 {
3608 kfree(net->ipv6.ip6_null_entry);
3609 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3610 kfree(net->ipv6.ip6_prohibit_entry);
3611 kfree(net->ipv6.ip6_blk_hole_entry);
3612 #endif
3613 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3614 }
3615
3616 static int __net_init ip6_route_net_init_late(struct net *net)
3617 {
3618 #ifdef CONFIG_PROC_FS
3619 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3620 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3621 #endif
3622 return 0;
3623 }
3624
3625 static void __net_exit ip6_route_net_exit_late(struct net *net)
3626 {
3627 #ifdef CONFIG_PROC_FS
3628 remove_proc_entry("ipv6_route", net->proc_net);
3629 remove_proc_entry("rt6_stats", net->proc_net);
3630 #endif
3631 }
3632
3633 static struct pernet_operations ip6_route_net_ops = {
3634 .init = ip6_route_net_init,
3635 .exit = ip6_route_net_exit,
3636 };
3637
3638 static int __net_init ipv6_inetpeer_init(struct net *net)
3639 {
3640 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3641
3642 if (!bp)
3643 return -ENOMEM;
3644 inet_peer_base_init(bp);
3645 net->ipv6.peers = bp;
3646 return 0;
3647 }
3648
3649 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3650 {
3651 struct inet_peer_base *bp = net->ipv6.peers;
3652
3653 net->ipv6.peers = NULL;
3654 inetpeer_invalidate_tree(bp);
3655 kfree(bp);
3656 }
3657
3658 static struct pernet_operations ipv6_inetpeer_ops = {
3659 .init = ipv6_inetpeer_init,
3660 .exit = ipv6_inetpeer_exit,
3661 };
3662
3663 static struct pernet_operations ip6_route_net_late_ops = {
3664 .init = ip6_route_net_init_late,
3665 .exit = ip6_route_net_exit_late,
3666 };
3667
3668 static struct notifier_block ip6_route_dev_notifier = {
3669 .notifier_call = ip6_route_dev_notify,
3670 .priority = 0,
3671 };
3672
3673 int __init ip6_route_init(void)
3674 {
3675 int ret;
3676 int cpu;
3677
3678 ret = -ENOMEM;
3679 ip6_dst_ops_template.kmem_cachep =
3680 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3681 SLAB_HWCACHE_ALIGN, NULL);
3682 if (!ip6_dst_ops_template.kmem_cachep)
3683 goto out;
3684
3685 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3686 if (ret)
3687 goto out_kmem_cache;
3688
3689 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3690 if (ret)
3691 goto out_dst_entries;
3692
3693 ret = register_pernet_subsys(&ip6_route_net_ops);
3694 if (ret)
3695 goto out_register_inetpeer;
3696
3697 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3698
3699 /* Registering of the loopback is done before this portion of code,
3700 * the loopback reference in rt6_info will not be taken, do it
3701 * manually for init_net */
3702 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3703 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3704 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3705 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3706 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3707 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3708 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3709 #endif
3710 ret = fib6_init();
3711 if (ret)
3712 goto out_register_subsys;
3713
3714 ret = xfrm6_init();
3715 if (ret)
3716 goto out_fib6_init;
3717
3718 ret = fib6_rules_init();
3719 if (ret)
3720 goto xfrm6_init;
3721
3722 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3723 if (ret)
3724 goto fib6_rules_init;
3725
3726 ret = -ENOBUFS;
3727 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3728 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3729 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3730 goto out_register_late_subsys;
3731
3732 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3733 if (ret)
3734 goto out_register_late_subsys;
3735
3736 for_each_possible_cpu(cpu) {
3737 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3738
3739 INIT_LIST_HEAD(&ul->head);
3740 spin_lock_init(&ul->lock);
3741 }
3742
3743 out:
3744 return ret;
3745
3746 out_register_late_subsys:
3747 unregister_pernet_subsys(&ip6_route_net_late_ops);
3748 fib6_rules_init:
3749 fib6_rules_cleanup();
3750 xfrm6_init:
3751 xfrm6_fini();
3752 out_fib6_init:
3753 fib6_gc_cleanup();
3754 out_register_subsys:
3755 unregister_pernet_subsys(&ip6_route_net_ops);
3756 out_register_inetpeer:
3757 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3758 out_dst_entries:
3759 dst_entries_destroy(&ip6_dst_blackhole_ops);
3760 out_kmem_cache:
3761 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3762 goto out;
3763 }
3764
3765 void ip6_route_cleanup(void)
3766 {
3767 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3768 unregister_pernet_subsys(&ip6_route_net_late_ops);
3769 fib6_rules_cleanup();
3770 xfrm6_fini();
3771 fib6_gc_cleanup();
3772 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3773 unregister_pernet_subsys(&ip6_route_net_ops);
3774 dst_entries_destroy(&ip6_dst_blackhole_ops);
3775 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3776 }
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