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Merge 4.4.68 into android-4.4
[GitHub/exynos8895/android_kernel_samsung_universal8895.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_device *dev,
103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, unsigned int pref);
105 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
106 const struct in6_addr *prefix, int prefixlen,
107 const struct in6_addr *gwaddr);
108 #endif
109
110 struct uncached_list {
111 spinlock_t lock;
112 struct list_head head;
113 };
114
115 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
116
117 static void rt6_uncached_list_add(struct rt6_info *rt)
118 {
119 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
120
121 rt->dst.flags |= DST_NOCACHE;
122 rt->rt6i_uncached_list = ul;
123
124 spin_lock_bh(&ul->lock);
125 list_add_tail(&rt->rt6i_uncached, &ul->head);
126 spin_unlock_bh(&ul->lock);
127 }
128
129 static void rt6_uncached_list_del(struct rt6_info *rt)
130 {
131 if (!list_empty(&rt->rt6i_uncached)) {
132 struct uncached_list *ul = rt->rt6i_uncached_list;
133
134 spin_lock_bh(&ul->lock);
135 list_del(&rt->rt6i_uncached);
136 spin_unlock_bh(&ul->lock);
137 }
138 }
139
140 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
141 {
142 struct net_device *loopback_dev = net->loopback_dev;
143 int cpu;
144
145 if (dev == loopback_dev)
146 return;
147
148 for_each_possible_cpu(cpu) {
149 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
150 struct rt6_info *rt;
151
152 spin_lock_bh(&ul->lock);
153 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
154 struct inet6_dev *rt_idev = rt->rt6i_idev;
155 struct net_device *rt_dev = rt->dst.dev;
156
157 if (rt_idev->dev == dev) {
158 rt->rt6i_idev = in6_dev_get(loopback_dev);
159 in6_dev_put(rt_idev);
160 }
161
162 if (rt_dev == dev) {
163 rt->dst.dev = loopback_dev;
164 dev_hold(rt->dst.dev);
165 dev_put(rt_dev);
166 }
167 }
168 spin_unlock_bh(&ul->lock);
169 }
170 }
171
172 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
173 {
174 return dst_metrics_write_ptr(rt->dst.from);
175 }
176
177 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
178 {
179 struct rt6_info *rt = (struct rt6_info *)dst;
180
181 if (rt->rt6i_flags & RTF_PCPU)
182 return rt6_pcpu_cow_metrics(rt);
183 else if (rt->rt6i_flags & RTF_CACHE)
184 return NULL;
185 else
186 return dst_cow_metrics_generic(dst, old);
187 }
188
189 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
190 struct sk_buff *skb,
191 const void *daddr)
192 {
193 struct in6_addr *p = &rt->rt6i_gateway;
194
195 if (!ipv6_addr_any(p))
196 return (const void *) p;
197 else if (skb)
198 return &ipv6_hdr(skb)->daddr;
199 return daddr;
200 }
201
202 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
203 struct sk_buff *skb,
204 const void *daddr)
205 {
206 struct rt6_info *rt = (struct rt6_info *) dst;
207 struct neighbour *n;
208
209 daddr = choose_neigh_daddr(rt, skb, daddr);
210 n = __ipv6_neigh_lookup(dst->dev, daddr);
211 if (n)
212 return n;
213 return neigh_create(&nd_tbl, daddr, dst->dev);
214 }
215
216 static struct dst_ops ip6_dst_ops_template = {
217 .family = AF_INET6,
218 .gc = ip6_dst_gc,
219 .gc_thresh = 1024,
220 .check = ip6_dst_check,
221 .default_advmss = ip6_default_advmss,
222 .mtu = ip6_mtu,
223 .cow_metrics = ipv6_cow_metrics,
224 .destroy = ip6_dst_destroy,
225 .ifdown = ip6_dst_ifdown,
226 .negative_advice = ip6_negative_advice,
227 .link_failure = ip6_link_failure,
228 .update_pmtu = ip6_rt_update_pmtu,
229 .redirect = rt6_do_redirect,
230 .local_out = __ip6_local_out,
231 .neigh_lookup = ip6_neigh_lookup,
232 };
233
234 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
235 {
236 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
237
238 return mtu ? : dst->dev->mtu;
239 }
240
241 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
242 struct sk_buff *skb, u32 mtu)
243 {
244 }
245
246 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
247 struct sk_buff *skb)
248 {
249 }
250
251 static struct dst_ops ip6_dst_blackhole_ops = {
252 .family = AF_INET6,
253 .destroy = ip6_dst_destroy,
254 .check = ip6_dst_check,
255 .mtu = ip6_blackhole_mtu,
256 .default_advmss = ip6_default_advmss,
257 .update_pmtu = ip6_rt_blackhole_update_pmtu,
258 .redirect = ip6_rt_blackhole_redirect,
259 .cow_metrics = dst_cow_metrics_generic,
260 .neigh_lookup = ip6_neigh_lookup,
261 };
262
263 static const u32 ip6_template_metrics[RTAX_MAX] = {
264 [RTAX_HOPLIMIT - 1] = 0,
265 };
266
267 static const struct rt6_info ip6_null_entry_template = {
268 .dst = {
269 .__refcnt = ATOMIC_INIT(1),
270 .__use = 1,
271 .obsolete = DST_OBSOLETE_FORCE_CHK,
272 .error = -ENETUNREACH,
273 .input = ip6_pkt_discard,
274 .output = ip6_pkt_discard_out,
275 },
276 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
277 .rt6i_protocol = RTPROT_KERNEL,
278 .rt6i_metric = ~(u32) 0,
279 .rt6i_ref = ATOMIC_INIT(1),
280 };
281
282 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
283
284 static const struct rt6_info ip6_prohibit_entry_template = {
285 .dst = {
286 .__refcnt = ATOMIC_INIT(1),
287 .__use = 1,
288 .obsolete = DST_OBSOLETE_FORCE_CHK,
289 .error = -EACCES,
290 .input = ip6_pkt_prohibit,
291 .output = ip6_pkt_prohibit_out,
292 },
293 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
294 .rt6i_protocol = RTPROT_KERNEL,
295 .rt6i_metric = ~(u32) 0,
296 .rt6i_ref = ATOMIC_INIT(1),
297 };
298
299 static const struct rt6_info ip6_blk_hole_entry_template = {
300 .dst = {
301 .__refcnt = ATOMIC_INIT(1),
302 .__use = 1,
303 .obsolete = DST_OBSOLETE_FORCE_CHK,
304 .error = -EINVAL,
305 .input = dst_discard,
306 .output = dst_discard_out,
307 },
308 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
309 .rt6i_protocol = RTPROT_KERNEL,
310 .rt6i_metric = ~(u32) 0,
311 .rt6i_ref = ATOMIC_INIT(1),
312 };
313
314 #endif
315
316 static void rt6_info_init(struct rt6_info *rt)
317 {
318 struct dst_entry *dst = &rt->dst;
319
320 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
321 INIT_LIST_HEAD(&rt->rt6i_siblings);
322 INIT_LIST_HEAD(&rt->rt6i_uncached);
323 }
324
325 /* allocate dst with ip6_dst_ops */
326 static struct rt6_info *__ip6_dst_alloc(struct net *net,
327 struct net_device *dev,
328 int flags)
329 {
330 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
331 0, DST_OBSOLETE_FORCE_CHK, flags);
332
333 if (rt)
334 rt6_info_init(rt);
335
336 return rt;
337 }
338
339 static struct rt6_info *ip6_dst_alloc(struct net *net,
340 struct net_device *dev,
341 int flags)
342 {
343 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
344
345 if (rt) {
346 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
347 if (rt->rt6i_pcpu) {
348 int cpu;
349
350 for_each_possible_cpu(cpu) {
351 struct rt6_info **p;
352
353 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
354 /* no one shares rt */
355 *p = NULL;
356 }
357 } else {
358 dst_destroy((struct dst_entry *)rt);
359 return NULL;
360 }
361 }
362
363 return rt;
364 }
365
366 static void ip6_dst_destroy(struct dst_entry *dst)
367 {
368 struct rt6_info *rt = (struct rt6_info *)dst;
369 struct dst_entry *from = dst->from;
370 struct inet6_dev *idev;
371
372 dst_destroy_metrics_generic(dst);
373 free_percpu(rt->rt6i_pcpu);
374 rt6_uncached_list_del(rt);
375
376 idev = rt->rt6i_idev;
377 if (idev) {
378 rt->rt6i_idev = NULL;
379 in6_dev_put(idev);
380 }
381
382 dst->from = NULL;
383 dst_release(from);
384 }
385
386 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
387 int how)
388 {
389 struct rt6_info *rt = (struct rt6_info *)dst;
390 struct inet6_dev *idev = rt->rt6i_idev;
391 struct net_device *loopback_dev =
392 dev_net(dev)->loopback_dev;
393
394 if (dev != loopback_dev) {
395 if (idev && idev->dev == dev) {
396 struct inet6_dev *loopback_idev =
397 in6_dev_get(loopback_dev);
398 if (loopback_idev) {
399 rt->rt6i_idev = loopback_idev;
400 in6_dev_put(idev);
401 }
402 }
403 }
404 }
405
406 static bool __rt6_check_expired(const struct rt6_info *rt)
407 {
408 if (rt->rt6i_flags & RTF_EXPIRES)
409 return time_after(jiffies, rt->dst.expires);
410 else
411 return false;
412 }
413
414 static bool rt6_check_expired(const struct rt6_info *rt)
415 {
416 if (rt->rt6i_flags & RTF_EXPIRES) {
417 if (time_after(jiffies, rt->dst.expires))
418 return true;
419 } else if (rt->dst.from) {
420 return rt6_check_expired((struct rt6_info *) rt->dst.from);
421 }
422 return false;
423 }
424
425 /* Multipath route selection:
426 * Hash based function using packet header and flowlabel.
427 * Adapted from fib_info_hashfn()
428 */
429 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
430 const struct flowi6 *fl6)
431 {
432 return get_hash_from_flowi6(fl6) % candidate_count;
433 }
434
435 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
436 struct flowi6 *fl6, int oif,
437 int strict)
438 {
439 struct rt6_info *sibling, *next_sibling;
440 int route_choosen;
441
442 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
443 /* Don't change the route, if route_choosen == 0
444 * (siblings does not include ourself)
445 */
446 if (route_choosen)
447 list_for_each_entry_safe(sibling, next_sibling,
448 &match->rt6i_siblings, rt6i_siblings) {
449 route_choosen--;
450 if (route_choosen == 0) {
451 if (rt6_score_route(sibling, oif, strict) < 0)
452 break;
453 match = sibling;
454 break;
455 }
456 }
457 return match;
458 }
459
460 /*
461 * Route lookup. Any table->tb6_lock is implied.
462 */
463
464 static inline struct rt6_info *rt6_device_match(struct net *net,
465 struct rt6_info *rt,
466 const struct in6_addr *saddr,
467 int oif,
468 int flags)
469 {
470 struct rt6_info *local = NULL;
471 struct rt6_info *sprt;
472
473 if (!oif && ipv6_addr_any(saddr))
474 goto out;
475
476 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
477 struct net_device *dev = sprt->dst.dev;
478
479 if (oif) {
480 if (dev->ifindex == oif)
481 return sprt;
482 if (dev->flags & IFF_LOOPBACK) {
483 if (!sprt->rt6i_idev ||
484 sprt->rt6i_idev->dev->ifindex != oif) {
485 if (flags & RT6_LOOKUP_F_IFACE)
486 continue;
487 if (local &&
488 local->rt6i_idev->dev->ifindex == oif)
489 continue;
490 }
491 local = sprt;
492 }
493 } else {
494 if (ipv6_chk_addr(net, saddr, dev,
495 flags & RT6_LOOKUP_F_IFACE))
496 return sprt;
497 }
498 }
499
500 if (oif) {
501 if (local)
502 return local;
503
504 if (flags & RT6_LOOKUP_F_IFACE)
505 return net->ipv6.ip6_null_entry;
506 }
507 out:
508 return rt;
509 }
510
511 #ifdef CONFIG_IPV6_ROUTER_PREF
512 struct __rt6_probe_work {
513 struct work_struct work;
514 struct in6_addr target;
515 struct net_device *dev;
516 };
517
518 static void rt6_probe_deferred(struct work_struct *w)
519 {
520 struct in6_addr mcaddr;
521 struct __rt6_probe_work *work =
522 container_of(w, struct __rt6_probe_work, work);
523
524 addrconf_addr_solict_mult(&work->target, &mcaddr);
525 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
526 dev_put(work->dev);
527 kfree(work);
528 }
529
530 static void rt6_probe(struct rt6_info *rt)
531 {
532 struct __rt6_probe_work *work;
533 struct neighbour *neigh;
534 /*
535 * Okay, this does not seem to be appropriate
536 * for now, however, we need to check if it
537 * is really so; aka Router Reachability Probing.
538 *
539 * Router Reachability Probe MUST be rate-limited
540 * to no more than one per minute.
541 */
542 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
543 return;
544 rcu_read_lock_bh();
545 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
546 if (neigh) {
547 if (neigh->nud_state & NUD_VALID)
548 goto out;
549
550 work = NULL;
551 write_lock(&neigh->lock);
552 if (!(neigh->nud_state & NUD_VALID) &&
553 time_after(jiffies,
554 neigh->updated +
555 rt->rt6i_idev->cnf.rtr_probe_interval)) {
556 work = kmalloc(sizeof(*work), GFP_ATOMIC);
557 if (work)
558 __neigh_set_probe_once(neigh);
559 }
560 write_unlock(&neigh->lock);
561 } else {
562 work = kmalloc(sizeof(*work), GFP_ATOMIC);
563 }
564
565 if (work) {
566 INIT_WORK(&work->work, rt6_probe_deferred);
567 work->target = rt->rt6i_gateway;
568 dev_hold(rt->dst.dev);
569 work->dev = rt->dst.dev;
570 schedule_work(&work->work);
571 }
572
573 out:
574 rcu_read_unlock_bh();
575 }
576 #else
577 static inline void rt6_probe(struct rt6_info *rt)
578 {
579 }
580 #endif
581
582 /*
583 * Default Router Selection (RFC 2461 6.3.6)
584 */
585 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
586 {
587 struct net_device *dev = rt->dst.dev;
588 if (!oif || dev->ifindex == oif)
589 return 2;
590 if ((dev->flags & IFF_LOOPBACK) &&
591 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
592 return 1;
593 return 0;
594 }
595
596 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
597 {
598 struct neighbour *neigh;
599 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
600
601 if (rt->rt6i_flags & RTF_NONEXTHOP ||
602 !(rt->rt6i_flags & RTF_GATEWAY))
603 return RT6_NUD_SUCCEED;
604
605 rcu_read_lock_bh();
606 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
607 if (neigh) {
608 read_lock(&neigh->lock);
609 if (neigh->nud_state & NUD_VALID)
610 ret = RT6_NUD_SUCCEED;
611 #ifdef CONFIG_IPV6_ROUTER_PREF
612 else if (!(neigh->nud_state & NUD_FAILED))
613 ret = RT6_NUD_SUCCEED;
614 else
615 ret = RT6_NUD_FAIL_PROBE;
616 #endif
617 read_unlock(&neigh->lock);
618 } else {
619 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
620 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
621 }
622 rcu_read_unlock_bh();
623
624 return ret;
625 }
626
627 static int rt6_score_route(struct rt6_info *rt, int oif,
628 int strict)
629 {
630 int m;
631
632 m = rt6_check_dev(rt, oif);
633 if (!m && (strict & RT6_LOOKUP_F_IFACE))
634 return RT6_NUD_FAIL_HARD;
635 #ifdef CONFIG_IPV6_ROUTER_PREF
636 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
637 #endif
638 if (strict & RT6_LOOKUP_F_REACHABLE) {
639 int n = rt6_check_neigh(rt);
640 if (n < 0)
641 return n;
642 }
643 return m;
644 }
645
646 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
647 int *mpri, struct rt6_info *match,
648 bool *do_rr)
649 {
650 int m;
651 bool match_do_rr = false;
652 struct inet6_dev *idev = rt->rt6i_idev;
653 struct net_device *dev = rt->dst.dev;
654
655 if (dev && !netif_carrier_ok(dev) &&
656 idev->cnf.ignore_routes_with_linkdown)
657 goto out;
658
659 if (rt6_check_expired(rt))
660 goto out;
661
662 m = rt6_score_route(rt, oif, strict);
663 if (m == RT6_NUD_FAIL_DO_RR) {
664 match_do_rr = true;
665 m = 0; /* lowest valid score */
666 } else if (m == RT6_NUD_FAIL_HARD) {
667 goto out;
668 }
669
670 if (strict & RT6_LOOKUP_F_REACHABLE)
671 rt6_probe(rt);
672
673 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
674 if (m > *mpri) {
675 *do_rr = match_do_rr;
676 *mpri = m;
677 match = rt;
678 }
679 out:
680 return match;
681 }
682
683 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
684 struct rt6_info *rr_head,
685 u32 metric, int oif, int strict,
686 bool *do_rr)
687 {
688 struct rt6_info *rt, *match, *cont;
689 int mpri = -1;
690
691 match = NULL;
692 cont = NULL;
693 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
694 if (rt->rt6i_metric != metric) {
695 cont = rt;
696 break;
697 }
698
699 match = find_match(rt, oif, strict, &mpri, match, do_rr);
700 }
701
702 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
703 if (rt->rt6i_metric != metric) {
704 cont = rt;
705 break;
706 }
707
708 match = find_match(rt, oif, strict, &mpri, match, do_rr);
709 }
710
711 if (match || !cont)
712 return match;
713
714 for (rt = cont; rt; rt = rt->dst.rt6_next)
715 match = find_match(rt, oif, strict, &mpri, match, do_rr);
716
717 return match;
718 }
719
720 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
721 {
722 struct rt6_info *match, *rt0;
723 struct net *net;
724 bool do_rr = false;
725
726 rt0 = fn->rr_ptr;
727 if (!rt0)
728 fn->rr_ptr = rt0 = fn->leaf;
729
730 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
731 &do_rr);
732
733 if (do_rr) {
734 struct rt6_info *next = rt0->dst.rt6_next;
735
736 /* no entries matched; do round-robin */
737 if (!next || next->rt6i_metric != rt0->rt6i_metric)
738 next = fn->leaf;
739
740 if (next != rt0)
741 fn->rr_ptr = next;
742 }
743
744 net = dev_net(rt0->dst.dev);
745 return match ? match : net->ipv6.ip6_null_entry;
746 }
747
748 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
749 {
750 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
751 }
752
753 #ifdef CONFIG_IPV6_ROUTE_INFO
754 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
755 const struct in6_addr *gwaddr)
756 {
757 struct route_info *rinfo = (struct route_info *) opt;
758 struct in6_addr prefix_buf, *prefix;
759 unsigned int pref;
760 unsigned long lifetime;
761 struct rt6_info *rt;
762
763 if (len < sizeof(struct route_info)) {
764 return -EINVAL;
765 }
766
767 /* Sanity check for prefix_len and length */
768 if (rinfo->length > 3) {
769 return -EINVAL;
770 } else if (rinfo->prefix_len > 128) {
771 return -EINVAL;
772 } else if (rinfo->prefix_len > 64) {
773 if (rinfo->length < 2) {
774 return -EINVAL;
775 }
776 } else if (rinfo->prefix_len > 0) {
777 if (rinfo->length < 1) {
778 return -EINVAL;
779 }
780 }
781
782 pref = rinfo->route_pref;
783 if (pref == ICMPV6_ROUTER_PREF_INVALID)
784 return -EINVAL;
785
786 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
787
788 if (rinfo->length == 3)
789 prefix = (struct in6_addr *)rinfo->prefix;
790 else {
791 /* this function is safe */
792 ipv6_addr_prefix(&prefix_buf,
793 (struct in6_addr *)rinfo->prefix,
794 rinfo->prefix_len);
795 prefix = &prefix_buf;
796 }
797
798 if (rinfo->prefix_len == 0)
799 rt = rt6_get_dflt_router(gwaddr, dev);
800 else
801 rt = rt6_get_route_info(dev, prefix, rinfo->prefix_len, gwaddr);
802
803 if (rt && !lifetime) {
804 ip6_del_rt(rt);
805 rt = NULL;
806 }
807
808 if (!rt && lifetime)
809 rt = rt6_add_route_info(dev, prefix, rinfo->prefix_len, gwaddr, pref);
810 else if (rt)
811 rt->rt6i_flags = RTF_ROUTEINFO |
812 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
813
814 if (rt) {
815 if (!addrconf_finite_timeout(lifetime))
816 rt6_clean_expires(rt);
817 else
818 rt6_set_expires(rt, jiffies + HZ * lifetime);
819
820 ip6_rt_put(rt);
821 }
822 return 0;
823 }
824 #endif
825
826 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
827 struct in6_addr *saddr)
828 {
829 struct fib6_node *pn;
830 while (1) {
831 if (fn->fn_flags & RTN_TL_ROOT)
832 return NULL;
833 pn = fn->parent;
834 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
835 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
836 else
837 fn = pn;
838 if (fn->fn_flags & RTN_RTINFO)
839 return fn;
840 }
841 }
842
843 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
844 struct fib6_table *table,
845 struct flowi6 *fl6, int flags)
846 {
847 struct fib6_node *fn;
848 struct rt6_info *rt;
849
850 read_lock_bh(&table->tb6_lock);
851 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
852 restart:
853 rt = fn->leaf;
854 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
855 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
856 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
857 if (rt == net->ipv6.ip6_null_entry) {
858 fn = fib6_backtrack(fn, &fl6->saddr);
859 if (fn)
860 goto restart;
861 }
862 dst_use(&rt->dst, jiffies);
863 read_unlock_bh(&table->tb6_lock);
864 return rt;
865
866 }
867
868 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
869 int flags)
870 {
871 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
872 }
873 EXPORT_SYMBOL_GPL(ip6_route_lookup);
874
875 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
876 const struct in6_addr *saddr, int oif, int strict)
877 {
878 struct flowi6 fl6 = {
879 .flowi6_oif = oif,
880 .daddr = *daddr,
881 };
882 struct dst_entry *dst;
883 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
884
885 if (saddr) {
886 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
887 flags |= RT6_LOOKUP_F_HAS_SADDR;
888 }
889
890 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
891 if (dst->error == 0)
892 return (struct rt6_info *) dst;
893
894 dst_release(dst);
895
896 return NULL;
897 }
898 EXPORT_SYMBOL(rt6_lookup);
899
900 /* ip6_ins_rt is called with FREE table->tb6_lock.
901 It takes new route entry, the addition fails by any reason the
902 route is freed. In any case, if caller does not hold it, it may
903 be destroyed.
904 */
905
906 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
907 struct mx6_config *mxc)
908 {
909 int err;
910 struct fib6_table *table;
911
912 table = rt->rt6i_table;
913 write_lock_bh(&table->tb6_lock);
914 err = fib6_add(&table->tb6_root, rt, info, mxc);
915 write_unlock_bh(&table->tb6_lock);
916
917 return err;
918 }
919
920 int ip6_ins_rt(struct rt6_info *rt)
921 {
922 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
923 struct mx6_config mxc = { .mx = NULL, };
924
925 return __ip6_ins_rt(rt, &info, &mxc);
926 }
927
928 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
929 const struct in6_addr *daddr,
930 const struct in6_addr *saddr)
931 {
932 struct rt6_info *rt;
933
934 /*
935 * Clone the route.
936 */
937
938 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
939 ort = (struct rt6_info *)ort->dst.from;
940
941 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
942
943 if (!rt)
944 return NULL;
945
946 ip6_rt_copy_init(rt, ort);
947 rt->rt6i_flags |= RTF_CACHE;
948 rt->rt6i_metric = 0;
949 rt->dst.flags |= DST_HOST;
950 rt->rt6i_dst.addr = *daddr;
951 rt->rt6i_dst.plen = 128;
952
953 if (!rt6_is_gw_or_nonexthop(ort)) {
954 if (ort->rt6i_dst.plen != 128 &&
955 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
956 rt->rt6i_flags |= RTF_ANYCAST;
957 #ifdef CONFIG_IPV6_SUBTREES
958 if (rt->rt6i_src.plen && saddr) {
959 rt->rt6i_src.addr = *saddr;
960 rt->rt6i_src.plen = 128;
961 }
962 #endif
963 }
964
965 return rt;
966 }
967
968 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
969 {
970 struct rt6_info *pcpu_rt;
971
972 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
973 rt->dst.dev, rt->dst.flags);
974
975 if (!pcpu_rt)
976 return NULL;
977 ip6_rt_copy_init(pcpu_rt, rt);
978 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
979 pcpu_rt->rt6i_flags |= RTF_PCPU;
980 return pcpu_rt;
981 }
982
983 /* It should be called with read_lock_bh(&tb6_lock) acquired */
984 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
985 {
986 struct rt6_info *pcpu_rt, **p;
987
988 p = this_cpu_ptr(rt->rt6i_pcpu);
989 pcpu_rt = *p;
990
991 if (pcpu_rt) {
992 dst_hold(&pcpu_rt->dst);
993 rt6_dst_from_metrics_check(pcpu_rt);
994 }
995 return pcpu_rt;
996 }
997
998 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
999 {
1000 struct fib6_table *table = rt->rt6i_table;
1001 struct rt6_info *pcpu_rt, *prev, **p;
1002
1003 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1004 if (!pcpu_rt) {
1005 struct net *net = dev_net(rt->dst.dev);
1006
1007 dst_hold(&net->ipv6.ip6_null_entry->dst);
1008 return net->ipv6.ip6_null_entry;
1009 }
1010
1011 read_lock_bh(&table->tb6_lock);
1012 if (rt->rt6i_pcpu) {
1013 p = this_cpu_ptr(rt->rt6i_pcpu);
1014 prev = cmpxchg(p, NULL, pcpu_rt);
1015 if (prev) {
1016 /* If someone did it before us, return prev instead */
1017 dst_destroy(&pcpu_rt->dst);
1018 pcpu_rt = prev;
1019 }
1020 } else {
1021 /* rt has been removed from the fib6 tree
1022 * before we have a chance to acquire the read_lock.
1023 * In this case, don't brother to create a pcpu rt
1024 * since rt is going away anyway. The next
1025 * dst_check() will trigger a re-lookup.
1026 */
1027 dst_destroy(&pcpu_rt->dst);
1028 pcpu_rt = rt;
1029 }
1030 dst_hold(&pcpu_rt->dst);
1031 rt6_dst_from_metrics_check(pcpu_rt);
1032 read_unlock_bh(&table->tb6_lock);
1033 return pcpu_rt;
1034 }
1035
1036 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1037 struct flowi6 *fl6, int flags)
1038 {
1039 struct fib6_node *fn, *saved_fn;
1040 struct rt6_info *rt;
1041 int strict = 0;
1042
1043 strict |= flags & RT6_LOOKUP_F_IFACE;
1044 if (net->ipv6.devconf_all->forwarding == 0)
1045 strict |= RT6_LOOKUP_F_REACHABLE;
1046
1047 read_lock_bh(&table->tb6_lock);
1048
1049 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1050 saved_fn = fn;
1051
1052 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1053 oif = 0;
1054
1055 redo_rt6_select:
1056 rt = rt6_select(fn, oif, strict);
1057 if (rt->rt6i_nsiblings)
1058 rt = rt6_multipath_select(rt, fl6, oif, strict);
1059 if (rt == net->ipv6.ip6_null_entry) {
1060 fn = fib6_backtrack(fn, &fl6->saddr);
1061 if (fn)
1062 goto redo_rt6_select;
1063 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1064 /* also consider unreachable route */
1065 strict &= ~RT6_LOOKUP_F_REACHABLE;
1066 fn = saved_fn;
1067 goto redo_rt6_select;
1068 }
1069 }
1070
1071
1072 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1073 dst_use(&rt->dst, jiffies);
1074 read_unlock_bh(&table->tb6_lock);
1075
1076 rt6_dst_from_metrics_check(rt);
1077 return rt;
1078 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1079 !(rt->rt6i_flags & RTF_GATEWAY))) {
1080 /* Create a RTF_CACHE clone which will not be
1081 * owned by the fib6 tree. It is for the special case where
1082 * the daddr in the skb during the neighbor look-up is different
1083 * from the fl6->daddr used to look-up route here.
1084 */
1085
1086 struct rt6_info *uncached_rt;
1087
1088 dst_use(&rt->dst, jiffies);
1089 read_unlock_bh(&table->tb6_lock);
1090
1091 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1092 dst_release(&rt->dst);
1093
1094 if (uncached_rt)
1095 rt6_uncached_list_add(uncached_rt);
1096 else
1097 uncached_rt = net->ipv6.ip6_null_entry;
1098
1099 dst_hold(&uncached_rt->dst);
1100 return uncached_rt;
1101
1102 } else {
1103 /* Get a percpu copy */
1104
1105 struct rt6_info *pcpu_rt;
1106
1107 rt->dst.lastuse = jiffies;
1108 rt->dst.__use++;
1109 pcpu_rt = rt6_get_pcpu_route(rt);
1110
1111 if (pcpu_rt) {
1112 read_unlock_bh(&table->tb6_lock);
1113 } else {
1114 /* We have to do the read_unlock first
1115 * because rt6_make_pcpu_route() may trigger
1116 * ip6_dst_gc() which will take the write_lock.
1117 */
1118 dst_hold(&rt->dst);
1119 read_unlock_bh(&table->tb6_lock);
1120 pcpu_rt = rt6_make_pcpu_route(rt);
1121 dst_release(&rt->dst);
1122 }
1123
1124 return pcpu_rt;
1125
1126 }
1127 }
1128
1129 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1130 struct flowi6 *fl6, int flags)
1131 {
1132 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1133 }
1134
1135 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1136 struct net_device *dev,
1137 struct flowi6 *fl6, int flags)
1138 {
1139 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1140 flags |= RT6_LOOKUP_F_IFACE;
1141
1142 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1143 }
1144
1145 void ip6_route_input(struct sk_buff *skb)
1146 {
1147 const struct ipv6hdr *iph = ipv6_hdr(skb);
1148 struct net *net = dev_net(skb->dev);
1149 int flags = RT6_LOOKUP_F_HAS_SADDR;
1150 struct ip_tunnel_info *tun_info;
1151 struct flowi6 fl6 = {
1152 .flowi6_iif = l3mdev_fib_oif(skb->dev),
1153 .daddr = iph->daddr,
1154 .saddr = iph->saddr,
1155 .flowlabel = ip6_flowinfo(iph),
1156 .flowi6_mark = skb->mark,
1157 .flowi6_proto = iph->nexthdr,
1158 };
1159
1160 tun_info = skb_tunnel_info(skb);
1161 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1162 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1163 skb_dst_drop(skb);
1164 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1165 }
1166
1167 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1168 struct flowi6 *fl6, int flags)
1169 {
1170 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1171 }
1172
1173 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1174 struct flowi6 *fl6, int flags)
1175 {
1176 struct dst_entry *dst;
1177 bool any_src;
1178
1179 dst = l3mdev_rt6_dst_by_oif(net, fl6);
1180 if (dst)
1181 return dst;
1182
1183 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1184
1185 any_src = ipv6_addr_any(&fl6->saddr);
1186 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1187 (fl6->flowi6_oif && any_src))
1188 flags |= RT6_LOOKUP_F_IFACE;
1189
1190 if (!any_src)
1191 flags |= RT6_LOOKUP_F_HAS_SADDR;
1192 else if (sk)
1193 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1194
1195 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1196 }
1197 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1198
1199 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1200 {
1201 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1202 struct dst_entry *new = NULL;
1203
1204 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1205 if (rt) {
1206 rt6_info_init(rt);
1207
1208 new = &rt->dst;
1209 new->__use = 1;
1210 new->input = dst_discard;
1211 new->output = dst_discard_out;
1212
1213 dst_copy_metrics(new, &ort->dst);
1214 rt->rt6i_idev = ort->rt6i_idev;
1215 if (rt->rt6i_idev)
1216 in6_dev_hold(rt->rt6i_idev);
1217
1218 rt->rt6i_gateway = ort->rt6i_gateway;
1219 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1220 rt->rt6i_metric = 0;
1221
1222 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1223 #ifdef CONFIG_IPV6_SUBTREES
1224 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1225 #endif
1226
1227 dst_free(new);
1228 }
1229
1230 dst_release(dst_orig);
1231 return new ? new : ERR_PTR(-ENOMEM);
1232 }
1233
1234 /*
1235 * Destination cache support functions
1236 */
1237
1238 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1239 {
1240 if (rt->dst.from &&
1241 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1242 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1243 }
1244
1245 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1246 {
1247 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1248 return NULL;
1249
1250 if (rt6_check_expired(rt))
1251 return NULL;
1252
1253 return &rt->dst;
1254 }
1255
1256 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1257 {
1258 if (!__rt6_check_expired(rt) &&
1259 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1260 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1261 return &rt->dst;
1262 else
1263 return NULL;
1264 }
1265
1266 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1267 {
1268 struct rt6_info *rt;
1269
1270 rt = (struct rt6_info *) dst;
1271
1272 /* All IPV6 dsts are created with ->obsolete set to the value
1273 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1274 * into this function always.
1275 */
1276
1277 rt6_dst_from_metrics_check(rt);
1278
1279 if (rt->rt6i_flags & RTF_PCPU ||
1280 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1281 return rt6_dst_from_check(rt, cookie);
1282 else
1283 return rt6_check(rt, cookie);
1284 }
1285
1286 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1287 {
1288 struct rt6_info *rt = (struct rt6_info *) dst;
1289
1290 if (rt) {
1291 if (rt->rt6i_flags & RTF_CACHE) {
1292 if (rt6_check_expired(rt)) {
1293 ip6_del_rt(rt);
1294 dst = NULL;
1295 }
1296 } else {
1297 dst_release(dst);
1298 dst = NULL;
1299 }
1300 }
1301 return dst;
1302 }
1303
1304 static void ip6_link_failure(struct sk_buff *skb)
1305 {
1306 struct rt6_info *rt;
1307
1308 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1309
1310 rt = (struct rt6_info *) skb_dst(skb);
1311 if (rt) {
1312 if (rt->rt6i_flags & RTF_CACHE) {
1313 dst_hold(&rt->dst);
1314 ip6_del_rt(rt);
1315 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1316 rt->rt6i_node->fn_sernum = -1;
1317 }
1318 }
1319 }
1320
1321 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1322 {
1323 struct net *net = dev_net(rt->dst.dev);
1324
1325 rt->rt6i_flags |= RTF_MODIFIED;
1326 rt->rt6i_pmtu = mtu;
1327 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1328 }
1329
1330 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1331 {
1332 return !(rt->rt6i_flags & RTF_CACHE) &&
1333 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1334 }
1335
1336 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1337 const struct ipv6hdr *iph, u32 mtu)
1338 {
1339 struct rt6_info *rt6 = (struct rt6_info *)dst;
1340
1341 if (rt6->rt6i_flags & RTF_LOCAL)
1342 return;
1343
1344 dst_confirm(dst);
1345 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1346 if (mtu >= dst_mtu(dst))
1347 return;
1348
1349 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1350 rt6_do_update_pmtu(rt6, mtu);
1351 } else {
1352 const struct in6_addr *daddr, *saddr;
1353 struct rt6_info *nrt6;
1354
1355 if (iph) {
1356 daddr = &iph->daddr;
1357 saddr = &iph->saddr;
1358 } else if (sk) {
1359 daddr = &sk->sk_v6_daddr;
1360 saddr = &inet6_sk(sk)->saddr;
1361 } else {
1362 return;
1363 }
1364 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1365 if (nrt6) {
1366 rt6_do_update_pmtu(nrt6, mtu);
1367
1368 /* ip6_ins_rt(nrt6) will bump the
1369 * rt6->rt6i_node->fn_sernum
1370 * which will fail the next rt6_check() and
1371 * invalidate the sk->sk_dst_cache.
1372 */
1373 ip6_ins_rt(nrt6);
1374 }
1375 }
1376 }
1377
1378 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1379 struct sk_buff *skb, u32 mtu)
1380 {
1381 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1382 }
1383
1384 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1385 int oif, u32 mark, kuid_t uid)
1386 {
1387 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1388 struct dst_entry *dst;
1389 struct flowi6 fl6;
1390
1391 memset(&fl6, 0, sizeof(fl6));
1392 fl6.flowi6_oif = oif;
1393 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1394 fl6.daddr = iph->daddr;
1395 fl6.saddr = iph->saddr;
1396 fl6.flowlabel = ip6_flowinfo(iph);
1397 fl6.flowi6_uid = uid;
1398
1399 dst = ip6_route_output(net, NULL, &fl6);
1400 if (!dst->error)
1401 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1402 dst_release(dst);
1403 }
1404 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1405
1406 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1407 {
1408 ip6_update_pmtu(skb, sock_net(sk), mtu,
1409 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
1410 }
1411 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1412
1413 /* Handle redirects */
1414 struct ip6rd_flowi {
1415 struct flowi6 fl6;
1416 struct in6_addr gateway;
1417 };
1418
1419 static struct rt6_info *__ip6_route_redirect(struct net *net,
1420 struct fib6_table *table,
1421 struct flowi6 *fl6,
1422 int flags)
1423 {
1424 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1425 struct rt6_info *rt;
1426 struct fib6_node *fn;
1427
1428 /* Get the "current" route for this destination and
1429 * check if the redirect has come from approriate router.
1430 *
1431 * RFC 4861 specifies that redirects should only be
1432 * accepted if they come from the nexthop to the target.
1433 * Due to the way the routes are chosen, this notion
1434 * is a bit fuzzy and one might need to check all possible
1435 * routes.
1436 */
1437
1438 read_lock_bh(&table->tb6_lock);
1439 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1440 restart:
1441 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1442 if (rt6_check_expired(rt))
1443 continue;
1444 if (rt->dst.error)
1445 break;
1446 if (!(rt->rt6i_flags & RTF_GATEWAY))
1447 continue;
1448 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1449 continue;
1450 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1451 continue;
1452 break;
1453 }
1454
1455 if (!rt)
1456 rt = net->ipv6.ip6_null_entry;
1457 else if (rt->dst.error) {
1458 rt = net->ipv6.ip6_null_entry;
1459 goto out;
1460 }
1461
1462 if (rt == net->ipv6.ip6_null_entry) {
1463 fn = fib6_backtrack(fn, &fl6->saddr);
1464 if (fn)
1465 goto restart;
1466 }
1467
1468 out:
1469 dst_hold(&rt->dst);
1470
1471 read_unlock_bh(&table->tb6_lock);
1472
1473 return rt;
1474 };
1475
1476 static struct dst_entry *ip6_route_redirect(struct net *net,
1477 const struct flowi6 *fl6,
1478 const struct in6_addr *gateway)
1479 {
1480 int flags = RT6_LOOKUP_F_HAS_SADDR;
1481 struct ip6rd_flowi rdfl;
1482
1483 rdfl.fl6 = *fl6;
1484 rdfl.gateway = *gateway;
1485
1486 return fib6_rule_lookup(net, &rdfl.fl6,
1487 flags, __ip6_route_redirect);
1488 }
1489
1490 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
1491 kuid_t uid)
1492 {
1493 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1494 struct dst_entry *dst;
1495 struct flowi6 fl6;
1496
1497 memset(&fl6, 0, sizeof(fl6));
1498 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1499 fl6.flowi6_oif = oif;
1500 fl6.flowi6_mark = mark;
1501 fl6.daddr = iph->daddr;
1502 fl6.saddr = iph->saddr;
1503 fl6.flowlabel = ip6_flowinfo(iph);
1504 fl6.flowi6_uid = uid;
1505
1506 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1507 rt6_do_redirect(dst, NULL, skb);
1508 dst_release(dst);
1509 }
1510 EXPORT_SYMBOL_GPL(ip6_redirect);
1511
1512 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1513 u32 mark)
1514 {
1515 const struct ipv6hdr *iph = ipv6_hdr(skb);
1516 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1517 struct dst_entry *dst;
1518 struct flowi6 fl6;
1519
1520 memset(&fl6, 0, sizeof(fl6));
1521 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1522 fl6.flowi6_oif = oif;
1523 fl6.flowi6_mark = mark;
1524 fl6.daddr = msg->dest;
1525 fl6.saddr = iph->daddr;
1526 fl6.flowi6_uid = sock_net_uid(net, NULL);
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 sk->sk_uid);
1537 }
1538 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1539
1540 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1541 {
1542 struct net_device *dev = dst->dev;
1543 unsigned int mtu = dst_mtu(dst);
1544 struct net *net = dev_net(dev);
1545
1546 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1547
1548 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1549 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1550
1551 /*
1552 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1553 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1554 * IPV6_MAXPLEN is also valid and means: "any MSS,
1555 * rely only on pmtu discovery"
1556 */
1557 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1558 mtu = IPV6_MAXPLEN;
1559 return mtu;
1560 }
1561
1562 static unsigned int ip6_mtu(const struct dst_entry *dst)
1563 {
1564 const struct rt6_info *rt = (const struct rt6_info *)dst;
1565 unsigned int mtu = rt->rt6i_pmtu;
1566 struct inet6_dev *idev;
1567
1568 if (mtu)
1569 goto out;
1570
1571 mtu = dst_metric_raw(dst, RTAX_MTU);
1572 if (mtu)
1573 goto out;
1574
1575 mtu = IPV6_MIN_MTU;
1576
1577 rcu_read_lock();
1578 idev = __in6_dev_get(dst->dev);
1579 if (idev)
1580 mtu = idev->cnf.mtu6;
1581 rcu_read_unlock();
1582
1583 out:
1584 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1585 }
1586
1587 static struct dst_entry *icmp6_dst_gc_list;
1588 static DEFINE_SPINLOCK(icmp6_dst_lock);
1589
1590 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1591 struct flowi6 *fl6)
1592 {
1593 struct dst_entry *dst;
1594 struct rt6_info *rt;
1595 struct inet6_dev *idev = in6_dev_get(dev);
1596 struct net *net = dev_net(dev);
1597
1598 if (unlikely(!idev))
1599 return ERR_PTR(-ENODEV);
1600
1601 rt = ip6_dst_alloc(net, dev, 0);
1602 if (unlikely(!rt)) {
1603 in6_dev_put(idev);
1604 dst = ERR_PTR(-ENOMEM);
1605 goto out;
1606 }
1607
1608 rt->dst.flags |= DST_HOST;
1609 rt->dst.output = ip6_output;
1610 atomic_set(&rt->dst.__refcnt, 1);
1611 rt->rt6i_gateway = fl6->daddr;
1612 rt->rt6i_dst.addr = fl6->daddr;
1613 rt->rt6i_dst.plen = 128;
1614 rt->rt6i_idev = idev;
1615 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1616
1617 spin_lock_bh(&icmp6_dst_lock);
1618 rt->dst.next = icmp6_dst_gc_list;
1619 icmp6_dst_gc_list = &rt->dst;
1620 spin_unlock_bh(&icmp6_dst_lock);
1621
1622 fib6_force_start_gc(net);
1623
1624 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1625
1626 out:
1627 return dst;
1628 }
1629
1630 int icmp6_dst_gc(void)
1631 {
1632 struct dst_entry *dst, **pprev;
1633 int more = 0;
1634
1635 spin_lock_bh(&icmp6_dst_lock);
1636 pprev = &icmp6_dst_gc_list;
1637
1638 while ((dst = *pprev) != NULL) {
1639 if (!atomic_read(&dst->__refcnt)) {
1640 *pprev = dst->next;
1641 dst_free(dst);
1642 } else {
1643 pprev = &dst->next;
1644 ++more;
1645 }
1646 }
1647
1648 spin_unlock_bh(&icmp6_dst_lock);
1649
1650 return more;
1651 }
1652
1653 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1654 void *arg)
1655 {
1656 struct dst_entry *dst, **pprev;
1657
1658 spin_lock_bh(&icmp6_dst_lock);
1659 pprev = &icmp6_dst_gc_list;
1660 while ((dst = *pprev) != NULL) {
1661 struct rt6_info *rt = (struct rt6_info *) dst;
1662 if (func(rt, arg)) {
1663 *pprev = dst->next;
1664 dst_free(dst);
1665 } else {
1666 pprev = &dst->next;
1667 }
1668 }
1669 spin_unlock_bh(&icmp6_dst_lock);
1670 }
1671
1672 static int ip6_dst_gc(struct dst_ops *ops)
1673 {
1674 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1675 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1676 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1677 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1678 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1679 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1680 int entries;
1681
1682 entries = dst_entries_get_fast(ops);
1683 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1684 entries <= rt_max_size)
1685 goto out;
1686
1687 net->ipv6.ip6_rt_gc_expire++;
1688 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1689 entries = dst_entries_get_slow(ops);
1690 if (entries < ops->gc_thresh)
1691 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1692 out:
1693 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1694 return entries > rt_max_size;
1695 }
1696
1697 static int ip6_convert_metrics(struct mx6_config *mxc,
1698 const struct fib6_config *cfg)
1699 {
1700 bool ecn_ca = false;
1701 struct nlattr *nla;
1702 int remaining;
1703 u32 *mp;
1704
1705 if (!cfg->fc_mx)
1706 return 0;
1707
1708 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1709 if (unlikely(!mp))
1710 return -ENOMEM;
1711
1712 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1713 int type = nla_type(nla);
1714 u32 val;
1715
1716 if (!type)
1717 continue;
1718 if (unlikely(type > RTAX_MAX))
1719 goto err;
1720
1721 if (type == RTAX_CC_ALGO) {
1722 char tmp[TCP_CA_NAME_MAX];
1723
1724 nla_strlcpy(tmp, nla, sizeof(tmp));
1725 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1726 if (val == TCP_CA_UNSPEC)
1727 goto err;
1728 } else {
1729 val = nla_get_u32(nla);
1730 }
1731 if (type == RTAX_HOPLIMIT && val > 255)
1732 val = 255;
1733 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1734 goto err;
1735
1736 mp[type - 1] = val;
1737 __set_bit(type - 1, mxc->mx_valid);
1738 }
1739
1740 if (ecn_ca) {
1741 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1742 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1743 }
1744
1745 mxc->mx = mp;
1746 return 0;
1747 err:
1748 kfree(mp);
1749 return -EINVAL;
1750 }
1751
1752 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1753 {
1754 struct net *net = cfg->fc_nlinfo.nl_net;
1755 struct rt6_info *rt = NULL;
1756 struct net_device *dev = NULL;
1757 struct inet6_dev *idev = NULL;
1758 struct fib6_table *table;
1759 int addr_type;
1760 int err = -EINVAL;
1761
1762 /* RTF_PCPU is an internal flag; can not be set by userspace */
1763 if (cfg->fc_flags & RTF_PCPU)
1764 goto out;
1765
1766 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1767 goto out;
1768 #ifndef CONFIG_IPV6_SUBTREES
1769 if (cfg->fc_src_len)
1770 goto out;
1771 #endif
1772 if (cfg->fc_ifindex) {
1773 err = -ENODEV;
1774 dev = dev_get_by_index(net, cfg->fc_ifindex);
1775 if (!dev)
1776 goto out;
1777 idev = in6_dev_get(dev);
1778 if (!idev)
1779 goto out;
1780 }
1781
1782 if (cfg->fc_metric == 0)
1783 cfg->fc_metric = IP6_RT_PRIO_USER;
1784
1785 err = -ENOBUFS;
1786 if (cfg->fc_nlinfo.nlh &&
1787 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1788 table = fib6_get_table(net, cfg->fc_table);
1789 if (!table) {
1790 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1791 table = fib6_new_table(net, cfg->fc_table);
1792 }
1793 } else {
1794 table = fib6_new_table(net, cfg->fc_table);
1795 }
1796
1797 if (!table)
1798 goto out;
1799
1800 rt = ip6_dst_alloc(net, NULL,
1801 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1802
1803 if (!rt) {
1804 err = -ENOMEM;
1805 goto out;
1806 }
1807
1808 if (cfg->fc_flags & RTF_EXPIRES)
1809 rt6_set_expires(rt, jiffies +
1810 clock_t_to_jiffies(cfg->fc_expires));
1811 else
1812 rt6_clean_expires(rt);
1813
1814 if (cfg->fc_protocol == RTPROT_UNSPEC)
1815 cfg->fc_protocol = RTPROT_BOOT;
1816 rt->rt6i_protocol = cfg->fc_protocol;
1817
1818 addr_type = ipv6_addr_type(&cfg->fc_dst);
1819
1820 if (addr_type & IPV6_ADDR_MULTICAST)
1821 rt->dst.input = ip6_mc_input;
1822 else if (cfg->fc_flags & RTF_LOCAL)
1823 rt->dst.input = ip6_input;
1824 else
1825 rt->dst.input = ip6_forward;
1826
1827 rt->dst.output = ip6_output;
1828
1829 if (cfg->fc_encap) {
1830 struct lwtunnel_state *lwtstate;
1831
1832 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1833 cfg->fc_encap, AF_INET6, cfg,
1834 &lwtstate);
1835 if (err)
1836 goto out;
1837 rt->dst.lwtstate = lwtstate_get(lwtstate);
1838 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1839 rt->dst.lwtstate->orig_output = rt->dst.output;
1840 rt->dst.output = lwtunnel_output;
1841 }
1842 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1843 rt->dst.lwtstate->orig_input = rt->dst.input;
1844 rt->dst.input = lwtunnel_input;
1845 }
1846 }
1847
1848 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1849 rt->rt6i_dst.plen = cfg->fc_dst_len;
1850 if (rt->rt6i_dst.plen == 128)
1851 rt->dst.flags |= DST_HOST;
1852
1853 #ifdef CONFIG_IPV6_SUBTREES
1854 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1855 rt->rt6i_src.plen = cfg->fc_src_len;
1856 #endif
1857
1858 rt->rt6i_metric = cfg->fc_metric;
1859
1860 /* We cannot add true routes via loopback here,
1861 they would result in kernel looping; promote them to reject routes
1862 */
1863 if ((cfg->fc_flags & RTF_REJECT) ||
1864 (dev && (dev->flags & IFF_LOOPBACK) &&
1865 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1866 !(cfg->fc_flags & RTF_LOCAL))) {
1867 /* hold loopback dev/idev if we haven't done so. */
1868 if (dev != net->loopback_dev) {
1869 if (dev) {
1870 dev_put(dev);
1871 in6_dev_put(idev);
1872 }
1873 dev = net->loopback_dev;
1874 dev_hold(dev);
1875 idev = in6_dev_get(dev);
1876 if (!idev) {
1877 err = -ENODEV;
1878 goto out;
1879 }
1880 }
1881 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1882 switch (cfg->fc_type) {
1883 case RTN_BLACKHOLE:
1884 rt->dst.error = -EINVAL;
1885 rt->dst.output = dst_discard_out;
1886 rt->dst.input = dst_discard;
1887 break;
1888 case RTN_PROHIBIT:
1889 rt->dst.error = -EACCES;
1890 rt->dst.output = ip6_pkt_prohibit_out;
1891 rt->dst.input = ip6_pkt_prohibit;
1892 break;
1893 case RTN_THROW:
1894 case RTN_UNREACHABLE:
1895 default:
1896 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1897 : (cfg->fc_type == RTN_UNREACHABLE)
1898 ? -EHOSTUNREACH : -ENETUNREACH;
1899 rt->dst.output = ip6_pkt_discard_out;
1900 rt->dst.input = ip6_pkt_discard;
1901 break;
1902 }
1903 goto install_route;
1904 }
1905
1906 if (cfg->fc_flags & RTF_GATEWAY) {
1907 const struct in6_addr *gw_addr;
1908 int gwa_type;
1909
1910 gw_addr = &cfg->fc_gateway;
1911 gwa_type = ipv6_addr_type(gw_addr);
1912
1913 /* if gw_addr is local we will fail to detect this in case
1914 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1915 * will return already-added prefix route via interface that
1916 * prefix route was assigned to, which might be non-loopback.
1917 */
1918 err = -EINVAL;
1919 if (ipv6_chk_addr_and_flags(net, gw_addr,
1920 gwa_type & IPV6_ADDR_LINKLOCAL ?
1921 dev : NULL, 0, 0))
1922 goto out;
1923
1924 rt->rt6i_gateway = *gw_addr;
1925
1926 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1927 struct rt6_info *grt;
1928
1929 /* IPv6 strictly inhibits using not link-local
1930 addresses as nexthop address.
1931 Otherwise, router will not able to send redirects.
1932 It is very good, but in some (rare!) circumstances
1933 (SIT, PtP, NBMA NOARP links) it is handy to allow
1934 some exceptions. --ANK
1935 */
1936 if (!(gwa_type & IPV6_ADDR_UNICAST))
1937 goto out;
1938
1939 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1940
1941 err = -EHOSTUNREACH;
1942 if (!grt)
1943 goto out;
1944 if (dev) {
1945 if (dev != grt->dst.dev) {
1946 ip6_rt_put(grt);
1947 goto out;
1948 }
1949 } else {
1950 dev = grt->dst.dev;
1951 idev = grt->rt6i_idev;
1952 dev_hold(dev);
1953 in6_dev_hold(grt->rt6i_idev);
1954 }
1955 if (!(grt->rt6i_flags & RTF_GATEWAY))
1956 err = 0;
1957 ip6_rt_put(grt);
1958
1959 if (err)
1960 goto out;
1961 }
1962 err = -EINVAL;
1963 if (!dev || (dev->flags & IFF_LOOPBACK))
1964 goto out;
1965 }
1966
1967 err = -ENODEV;
1968 if (!dev)
1969 goto out;
1970
1971 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1972 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1973 err = -EINVAL;
1974 goto out;
1975 }
1976 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1977 rt->rt6i_prefsrc.plen = 128;
1978 } else
1979 rt->rt6i_prefsrc.plen = 0;
1980
1981 rt->rt6i_flags = cfg->fc_flags;
1982
1983 install_route:
1984 rt->dst.dev = dev;
1985 rt->rt6i_idev = idev;
1986 rt->rt6i_table = table;
1987
1988 cfg->fc_nlinfo.nl_net = dev_net(dev);
1989
1990 return rt;
1991 out:
1992 if (dev)
1993 dev_put(dev);
1994 if (idev)
1995 in6_dev_put(idev);
1996 if (rt)
1997 dst_free(&rt->dst);
1998
1999 return ERR_PTR(err);
2000 }
2001
2002 int ip6_route_add(struct fib6_config *cfg)
2003 {
2004 struct mx6_config mxc = { .mx = NULL, };
2005 struct rt6_info *rt;
2006 int err;
2007
2008 rt = ip6_route_info_create(cfg);
2009 if (IS_ERR(rt)) {
2010 err = PTR_ERR(rt);
2011 rt = NULL;
2012 goto out;
2013 }
2014
2015 err = ip6_convert_metrics(&mxc, cfg);
2016 if (err)
2017 goto out;
2018
2019 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2020
2021 kfree(mxc.mx);
2022
2023 return err;
2024 out:
2025 if (rt)
2026 dst_free(&rt->dst);
2027
2028 return err;
2029 }
2030
2031 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2032 {
2033 int err;
2034 struct fib6_table *table;
2035 struct net *net = dev_net(rt->dst.dev);
2036
2037 if (rt == net->ipv6.ip6_null_entry ||
2038 rt->dst.flags & DST_NOCACHE) {
2039 err = -ENOENT;
2040 goto out;
2041 }
2042
2043 table = rt->rt6i_table;
2044 write_lock_bh(&table->tb6_lock);
2045 err = fib6_del(rt, info);
2046 write_unlock_bh(&table->tb6_lock);
2047
2048 out:
2049 ip6_rt_put(rt);
2050 return err;
2051 }
2052
2053 int ip6_del_rt(struct rt6_info *rt)
2054 {
2055 struct nl_info info = {
2056 .nl_net = dev_net(rt->dst.dev),
2057 };
2058 return __ip6_del_rt(rt, &info);
2059 }
2060
2061 static int ip6_route_del(struct fib6_config *cfg)
2062 {
2063 struct fib6_table *table;
2064 struct fib6_node *fn;
2065 struct rt6_info *rt;
2066 int err = -ESRCH;
2067
2068 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2069 if (!table)
2070 return err;
2071
2072 read_lock_bh(&table->tb6_lock);
2073
2074 fn = fib6_locate(&table->tb6_root,
2075 &cfg->fc_dst, cfg->fc_dst_len,
2076 &cfg->fc_src, cfg->fc_src_len);
2077
2078 if (fn) {
2079 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2080 if ((rt->rt6i_flags & RTF_CACHE) &&
2081 !(cfg->fc_flags & RTF_CACHE))
2082 continue;
2083 if (cfg->fc_ifindex &&
2084 (!rt->dst.dev ||
2085 rt->dst.dev->ifindex != cfg->fc_ifindex))
2086 continue;
2087 if (cfg->fc_flags & RTF_GATEWAY &&
2088 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2089 continue;
2090 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2091 continue;
2092 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
2093 continue;
2094 dst_hold(&rt->dst);
2095 read_unlock_bh(&table->tb6_lock);
2096
2097 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2098 }
2099 }
2100 read_unlock_bh(&table->tb6_lock);
2101
2102 return err;
2103 }
2104
2105 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2106 {
2107 struct netevent_redirect netevent;
2108 struct rt6_info *rt, *nrt = NULL;
2109 struct ndisc_options ndopts;
2110 struct inet6_dev *in6_dev;
2111 struct neighbour *neigh;
2112 struct rd_msg *msg;
2113 int optlen, on_link;
2114 u8 *lladdr;
2115
2116 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2117 optlen -= sizeof(*msg);
2118
2119 if (optlen < 0) {
2120 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2121 return;
2122 }
2123
2124 msg = (struct rd_msg *)icmp6_hdr(skb);
2125
2126 if (ipv6_addr_is_multicast(&msg->dest)) {
2127 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2128 return;
2129 }
2130
2131 on_link = 0;
2132 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2133 on_link = 1;
2134 } else if (ipv6_addr_type(&msg->target) !=
2135 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2136 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2137 return;
2138 }
2139
2140 in6_dev = __in6_dev_get(skb->dev);
2141 if (!in6_dev)
2142 return;
2143 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2144 return;
2145
2146 /* RFC2461 8.1:
2147 * The IP source address of the Redirect MUST be the same as the current
2148 * first-hop router for the specified ICMP Destination Address.
2149 */
2150
2151 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2152 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2153 return;
2154 }
2155
2156 lladdr = NULL;
2157 if (ndopts.nd_opts_tgt_lladdr) {
2158 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2159 skb->dev);
2160 if (!lladdr) {
2161 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2162 return;
2163 }
2164 }
2165
2166 rt = (struct rt6_info *) dst;
2167 if (rt->rt6i_flags & RTF_REJECT) {
2168 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2169 return;
2170 }
2171
2172 /* Redirect received -> path was valid.
2173 * Look, redirects are sent only in response to data packets,
2174 * so that this nexthop apparently is reachable. --ANK
2175 */
2176 dst_confirm(&rt->dst);
2177
2178 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2179 if (!neigh)
2180 return;
2181
2182 /*
2183 * We have finally decided to accept it.
2184 */
2185
2186 neigh_update(neigh, lladdr, NUD_STALE,
2187 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2188 NEIGH_UPDATE_F_OVERRIDE|
2189 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2190 NEIGH_UPDATE_F_ISROUTER))
2191 );
2192
2193 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2194 if (!nrt)
2195 goto out;
2196
2197 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2198 if (on_link)
2199 nrt->rt6i_flags &= ~RTF_GATEWAY;
2200
2201 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2202
2203 if (ip6_ins_rt(nrt))
2204 goto out;
2205
2206 netevent.old = &rt->dst;
2207 netevent.new = &nrt->dst;
2208 netevent.daddr = &msg->dest;
2209 netevent.neigh = neigh;
2210 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2211
2212 if (rt->rt6i_flags & RTF_CACHE) {
2213 rt = (struct rt6_info *) dst_clone(&rt->dst);
2214 ip6_del_rt(rt);
2215 }
2216
2217 out:
2218 neigh_release(neigh);
2219 }
2220
2221 /*
2222 * Misc support functions
2223 */
2224
2225 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2226 {
2227 BUG_ON(from->dst.from);
2228
2229 rt->rt6i_flags &= ~RTF_EXPIRES;
2230 dst_hold(&from->dst);
2231 rt->dst.from = &from->dst;
2232 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2233 }
2234
2235 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2236 {
2237 rt->dst.input = ort->dst.input;
2238 rt->dst.output = ort->dst.output;
2239 rt->rt6i_dst = ort->rt6i_dst;
2240 rt->dst.error = ort->dst.error;
2241 rt->rt6i_idev = ort->rt6i_idev;
2242 if (rt->rt6i_idev)
2243 in6_dev_hold(rt->rt6i_idev);
2244 rt->dst.lastuse = jiffies;
2245 rt->rt6i_gateway = ort->rt6i_gateway;
2246 rt->rt6i_flags = ort->rt6i_flags;
2247 rt6_set_from(rt, ort);
2248 rt->rt6i_metric = ort->rt6i_metric;
2249 #ifdef CONFIG_IPV6_SUBTREES
2250 rt->rt6i_src = ort->rt6i_src;
2251 #endif
2252 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2253 rt->rt6i_table = ort->rt6i_table;
2254 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2255 }
2256
2257 #ifdef CONFIG_IPV6_ROUTE_INFO
2258 static struct rt6_info *rt6_get_route_info(struct net_device *dev,
2259 const struct in6_addr *prefix, int prefixlen,
2260 const struct in6_addr *gwaddr)
2261 {
2262 struct fib6_node *fn;
2263 struct rt6_info *rt = NULL;
2264 struct fib6_table *table;
2265
2266 table = fib6_get_table(dev_net(dev),
2267 addrconf_rt_table(dev, RT6_TABLE_INFO));
2268 if (!table)
2269 return NULL;
2270
2271 read_lock_bh(&table->tb6_lock);
2272 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2273 if (!fn)
2274 goto out;
2275
2276 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2277 if (rt->dst.dev->ifindex != dev->ifindex)
2278 continue;
2279 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2280 continue;
2281 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2282 continue;
2283 dst_hold(&rt->dst);
2284 break;
2285 }
2286 out:
2287 read_unlock_bh(&table->tb6_lock);
2288 return rt;
2289 }
2290
2291 static struct rt6_info *rt6_add_route_info(struct net_device *dev,
2292 const struct in6_addr *prefix, int prefixlen,
2293 const struct in6_addr *gwaddr, unsigned int pref)
2294 {
2295 struct fib6_config cfg = {
2296 .fc_metric = IP6_RT_PRIO_USER,
2297 .fc_ifindex = dev->ifindex,
2298 .fc_dst_len = prefixlen,
2299 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2300 RTF_UP | RTF_PREF(pref),
2301 .fc_nlinfo.portid = 0,
2302 .fc_nlinfo.nlh = NULL,
2303 .fc_nlinfo.nl_net = dev_net(dev),
2304 };
2305
2306 cfg.fc_table = l3mdev_fib_table_by_index(dev_net(dev), dev->ifindex) ? : addrconf_rt_table(dev, RT6_TABLE_INFO);
2307 cfg.fc_dst = *prefix;
2308 cfg.fc_gateway = *gwaddr;
2309
2310 /* We should treat it as a default route if prefix length is 0. */
2311 if (!prefixlen)
2312 cfg.fc_flags |= RTF_DEFAULT;
2313
2314 ip6_route_add(&cfg);
2315
2316 return rt6_get_route_info(dev, prefix, prefixlen, gwaddr);
2317 }
2318 #endif
2319
2320 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2321 {
2322 struct rt6_info *rt;
2323 struct fib6_table *table;
2324
2325 table = fib6_get_table(dev_net(dev),
2326 addrconf_rt_table(dev, RT6_TABLE_MAIN));
2327 if (!table)
2328 return NULL;
2329
2330 read_lock_bh(&table->tb6_lock);
2331 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2332 if (dev == rt->dst.dev &&
2333 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2334 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2335 break;
2336 }
2337 if (rt)
2338 dst_hold(&rt->dst);
2339 read_unlock_bh(&table->tb6_lock);
2340 return rt;
2341 }
2342
2343 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2344 struct net_device *dev,
2345 unsigned int pref)
2346 {
2347 struct fib6_config cfg = {
2348 .fc_table = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_DFLT),
2349 .fc_metric = IP6_RT_PRIO_USER,
2350 .fc_ifindex = dev->ifindex,
2351 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2352 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2353 .fc_nlinfo.portid = 0,
2354 .fc_nlinfo.nlh = NULL,
2355 .fc_nlinfo.nl_net = dev_net(dev),
2356 };
2357
2358 cfg.fc_gateway = *gwaddr;
2359
2360 ip6_route_add(&cfg);
2361
2362 return rt6_get_dflt_router(gwaddr, dev);
2363 }
2364
2365
2366 int rt6_addrconf_purge(struct rt6_info *rt, void *arg) {
2367 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2368 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2))
2369 return -1;
2370 return 0;
2371 }
2372
2373 void rt6_purge_dflt_routers(struct net *net)
2374 {
2375 fib6_clean_all(net, rt6_addrconf_purge, NULL);
2376 }
2377
2378 static void rtmsg_to_fib6_config(struct net *net,
2379 struct in6_rtmsg *rtmsg,
2380 struct fib6_config *cfg)
2381 {
2382 memset(cfg, 0, sizeof(*cfg));
2383
2384 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2385 : RT6_TABLE_MAIN;
2386 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2387 cfg->fc_metric = rtmsg->rtmsg_metric;
2388 cfg->fc_expires = rtmsg->rtmsg_info;
2389 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2390 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2391 cfg->fc_flags = rtmsg->rtmsg_flags;
2392
2393 cfg->fc_nlinfo.nl_net = net;
2394
2395 cfg->fc_dst = rtmsg->rtmsg_dst;
2396 cfg->fc_src = rtmsg->rtmsg_src;
2397 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2398 }
2399
2400 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2401 {
2402 struct fib6_config cfg;
2403 struct in6_rtmsg rtmsg;
2404 int err;
2405
2406 switch (cmd) {
2407 case SIOCADDRT: /* Add a route */
2408 case SIOCDELRT: /* Delete a route */
2409 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2410 return -EPERM;
2411 err = copy_from_user(&rtmsg, arg,
2412 sizeof(struct in6_rtmsg));
2413 if (err)
2414 return -EFAULT;
2415
2416 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2417
2418 rtnl_lock();
2419 switch (cmd) {
2420 case SIOCADDRT:
2421 err = ip6_route_add(&cfg);
2422 break;
2423 case SIOCDELRT:
2424 err = ip6_route_del(&cfg);
2425 break;
2426 default:
2427 err = -EINVAL;
2428 }
2429 rtnl_unlock();
2430
2431 return err;
2432 }
2433
2434 return -EINVAL;
2435 }
2436
2437 /*
2438 * Drop the packet on the floor
2439 */
2440
2441 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2442 {
2443 int type;
2444 struct dst_entry *dst = skb_dst(skb);
2445 switch (ipstats_mib_noroutes) {
2446 case IPSTATS_MIB_INNOROUTES:
2447 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2448 if (type == IPV6_ADDR_ANY) {
2449 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2450 IPSTATS_MIB_INADDRERRORS);
2451 break;
2452 }
2453 /* FALLTHROUGH */
2454 case IPSTATS_MIB_OUTNOROUTES:
2455 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2456 ipstats_mib_noroutes);
2457 break;
2458 }
2459 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2460 kfree_skb(skb);
2461 return 0;
2462 }
2463
2464 static int ip6_pkt_discard(struct sk_buff *skb)
2465 {
2466 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2467 }
2468
2469 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2470 {
2471 skb->dev = skb_dst(skb)->dev;
2472 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2473 }
2474
2475 static int ip6_pkt_prohibit(struct sk_buff *skb)
2476 {
2477 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2478 }
2479
2480 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2481 {
2482 skb->dev = skb_dst(skb)->dev;
2483 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2484 }
2485
2486 /*
2487 * Allocate a dst for local (unicast / anycast) address.
2488 */
2489
2490 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2491 const struct in6_addr *addr,
2492 bool anycast)
2493 {
2494 u32 tb_id;
2495 struct net *net = dev_net(idev->dev);
2496 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2497 DST_NOCOUNT);
2498 if (!rt)
2499 return ERR_PTR(-ENOMEM);
2500
2501 in6_dev_hold(idev);
2502
2503 rt->dst.flags |= DST_HOST;
2504 rt->dst.input = ip6_input;
2505 rt->dst.output = ip6_output;
2506 rt->rt6i_idev = idev;
2507
2508 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2509 if (anycast)
2510 rt->rt6i_flags |= RTF_ANYCAST;
2511 else
2512 rt->rt6i_flags |= RTF_LOCAL;
2513
2514 rt->rt6i_gateway = *addr;
2515 rt->rt6i_dst.addr = *addr;
2516 rt->rt6i_dst.plen = 128;
2517 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2518 rt->rt6i_table = fib6_get_table(net, tb_id);
2519 rt->dst.flags |= DST_NOCACHE;
2520
2521 atomic_set(&rt->dst.__refcnt, 1);
2522
2523 return rt;
2524 }
2525
2526 int ip6_route_get_saddr(struct net *net,
2527 struct rt6_info *rt,
2528 const struct in6_addr *daddr,
2529 unsigned int prefs,
2530 struct in6_addr *saddr)
2531 {
2532 struct inet6_dev *idev =
2533 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2534 int err = 0;
2535 if (rt && rt->rt6i_prefsrc.plen)
2536 *saddr = rt->rt6i_prefsrc.addr;
2537 else
2538 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2539 daddr, prefs, saddr);
2540 return err;
2541 }
2542
2543 /* remove deleted ip from prefsrc entries */
2544 struct arg_dev_net_ip {
2545 struct net_device *dev;
2546 struct net *net;
2547 struct in6_addr *addr;
2548 };
2549
2550 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2551 {
2552 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2553 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2554 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2555
2556 if (((void *)rt->dst.dev == dev || !dev) &&
2557 rt != net->ipv6.ip6_null_entry &&
2558 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2559 /* remove prefsrc entry */
2560 rt->rt6i_prefsrc.plen = 0;
2561 }
2562 return 0;
2563 }
2564
2565 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2566 {
2567 struct net *net = dev_net(ifp->idev->dev);
2568 struct arg_dev_net_ip adni = {
2569 .dev = ifp->idev->dev,
2570 .net = net,
2571 .addr = &ifp->addr,
2572 };
2573 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2574 }
2575
2576 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2577 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2578
2579 /* Remove routers and update dst entries when gateway turn into host. */
2580 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2581 {
2582 struct in6_addr *gateway = (struct in6_addr *)arg;
2583
2584 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2585 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2586 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2587 return -1;
2588 }
2589 return 0;
2590 }
2591
2592 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2593 {
2594 fib6_clean_all(net, fib6_clean_tohost, gateway);
2595 }
2596
2597 struct arg_dev_net {
2598 struct net_device *dev;
2599 struct net *net;
2600 };
2601
2602 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2603 {
2604 const struct arg_dev_net *adn = arg;
2605 const struct net_device *dev = adn->dev;
2606
2607 if ((rt->dst.dev == dev || !dev) &&
2608 rt != adn->net->ipv6.ip6_null_entry)
2609 return -1;
2610
2611 return 0;
2612 }
2613
2614 void rt6_ifdown(struct net *net, struct net_device *dev)
2615 {
2616 struct arg_dev_net adn = {
2617 .dev = dev,
2618 .net = net,
2619 };
2620
2621 fib6_clean_all(net, fib6_ifdown, &adn);
2622 icmp6_clean_all(fib6_ifdown, &adn);
2623 if (dev)
2624 rt6_uncached_list_flush_dev(net, dev);
2625 }
2626
2627 struct rt6_mtu_change_arg {
2628 struct net_device *dev;
2629 unsigned int mtu;
2630 };
2631
2632 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2633 {
2634 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2635 struct inet6_dev *idev;
2636
2637 /* In IPv6 pmtu discovery is not optional,
2638 so that RTAX_MTU lock cannot disable it.
2639 We still use this lock to block changes
2640 caused by addrconf/ndisc.
2641 */
2642
2643 idev = __in6_dev_get(arg->dev);
2644 if (!idev)
2645 return 0;
2646
2647 /* For administrative MTU increase, there is no way to discover
2648 IPv6 PMTU increase, so PMTU increase should be updated here.
2649 Since RFC 1981 doesn't include administrative MTU increase
2650 update PMTU increase is a MUST. (i.e. jumbo frame)
2651 */
2652 /*
2653 If new MTU is less than route PMTU, this new MTU will be the
2654 lowest MTU in the path, update the route PMTU to reflect PMTU
2655 decreases; if new MTU is greater than route PMTU, and the
2656 old MTU is the lowest MTU in the path, update the route PMTU
2657 to reflect the increase. In this case if the other nodes' MTU
2658 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2659 PMTU discouvery.
2660 */
2661 if (rt->dst.dev == arg->dev &&
2662 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2663 if (rt->rt6i_flags & RTF_CACHE) {
2664 /* For RTF_CACHE with rt6i_pmtu == 0
2665 * (i.e. a redirected route),
2666 * the metrics of its rt->dst.from has already
2667 * been updated.
2668 */
2669 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2670 rt->rt6i_pmtu = arg->mtu;
2671 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2672 (dst_mtu(&rt->dst) < arg->mtu &&
2673 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2674 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2675 }
2676 }
2677 return 0;
2678 }
2679
2680 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2681 {
2682 struct rt6_mtu_change_arg arg = {
2683 .dev = dev,
2684 .mtu = mtu,
2685 };
2686
2687 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2688 }
2689
2690 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2691 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2692 [RTA_OIF] = { .type = NLA_U32 },
2693 [RTA_IIF] = { .type = NLA_U32 },
2694 [RTA_PRIORITY] = { .type = NLA_U32 },
2695 [RTA_METRICS] = { .type = NLA_NESTED },
2696 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2697 [RTA_PREF] = { .type = NLA_U8 },
2698 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2699 [RTA_ENCAP] = { .type = NLA_NESTED },
2700 [RTA_UID] = { .type = NLA_U32 },
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 portid);
3143
3144 if (err <= 0) {
3145 if (!nowait) {
3146 if (err == 0)
3147 return 0;
3148 goto nla_put_failure;
3149 } else {
3150 if (err == -EMSGSIZE)
3151 goto nla_put_failure;
3152 }
3153 }
3154 } else
3155 #endif
3156 if (nla_put_u32(skb, RTA_IIF, iif))
3157 goto nla_put_failure;
3158 } else if (dst) {
3159 struct in6_addr saddr_buf;
3160 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3161 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3162 goto nla_put_failure;
3163 }
3164
3165 if (rt->rt6i_prefsrc.plen) {
3166 struct in6_addr saddr_buf;
3167 saddr_buf = rt->rt6i_prefsrc.addr;
3168 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3169 goto nla_put_failure;
3170 }
3171
3172 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3173 if (rt->rt6i_pmtu)
3174 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3175 if (rtnetlink_put_metrics(skb, metrics) < 0)
3176 goto nla_put_failure;
3177
3178 if (rt->rt6i_flags & RTF_GATEWAY) {
3179 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3180 goto nla_put_failure;
3181 }
3182
3183 if (rt->dst.dev &&
3184 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3185 goto nla_put_failure;
3186 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3187 goto nla_put_failure;
3188
3189 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3190
3191 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3192 goto nla_put_failure;
3193
3194 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3195 goto nla_put_failure;
3196
3197 if (lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
3198 goto nla_put_failure;
3199
3200 nlmsg_end(skb, nlh);
3201 return 0;
3202
3203 nla_put_failure:
3204 nlmsg_cancel(skb, nlh);
3205 return -EMSGSIZE;
3206 }
3207
3208 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3209 {
3210 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3211 int prefix;
3212
3213 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3214 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3215 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3216 } else
3217 prefix = 0;
3218
3219 return rt6_fill_node(arg->net,
3220 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3221 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3222 prefix, 0, NLM_F_MULTI);
3223 }
3224
3225 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3226 {
3227 struct net *net = sock_net(in_skb->sk);
3228 struct nlattr *tb[RTA_MAX+1];
3229 struct rt6_info *rt;
3230 struct sk_buff *skb;
3231 struct rtmsg *rtm;
3232 struct flowi6 fl6;
3233 int err, iif = 0, oif = 0;
3234
3235 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3236 if (err < 0)
3237 goto errout;
3238
3239 err = -EINVAL;
3240 memset(&fl6, 0, sizeof(fl6));
3241
3242 if (tb[RTA_SRC]) {
3243 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3244 goto errout;
3245
3246 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3247 }
3248
3249 if (tb[RTA_DST]) {
3250 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3251 goto errout;
3252
3253 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3254 }
3255
3256 if (tb[RTA_IIF])
3257 iif = nla_get_u32(tb[RTA_IIF]);
3258
3259 if (tb[RTA_OIF])
3260 oif = nla_get_u32(tb[RTA_OIF]);
3261
3262 if (tb[RTA_MARK])
3263 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3264
3265 if (tb[RTA_UID])
3266 fl6.flowi6_uid = make_kuid(current_user_ns(),
3267 nla_get_u32(tb[RTA_UID]));
3268 else
3269 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3270
3271 if (iif) {
3272 struct net_device *dev;
3273 int flags = 0;
3274
3275 dev = __dev_get_by_index(net, iif);
3276 if (!dev) {
3277 err = -ENODEV;
3278 goto errout;
3279 }
3280
3281 fl6.flowi6_iif = iif;
3282
3283 if (!ipv6_addr_any(&fl6.saddr))
3284 flags |= RT6_LOOKUP_F_HAS_SADDR;
3285
3286 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3287 flags);
3288 } else {
3289 fl6.flowi6_oif = oif;
3290
3291 if (netif_index_is_l3_master(net, oif)) {
3292 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3293 FLOWI_FLAG_SKIP_NH_OIF;
3294 }
3295
3296 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3297 }
3298
3299 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3300 if (!skb) {
3301 ip6_rt_put(rt);
3302 err = -ENOBUFS;
3303 goto errout;
3304 }
3305
3306 /* Reserve room for dummy headers, this skb can pass
3307 through good chunk of routing engine.
3308 */
3309 skb_reset_mac_header(skb);
3310 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3311
3312 skb_dst_set(skb, &rt->dst);
3313
3314 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3315 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3316 nlh->nlmsg_seq, 0, 0, 0);
3317 if (err < 0) {
3318 kfree_skb(skb);
3319 goto errout;
3320 }
3321
3322 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3323 errout:
3324 return err;
3325 }
3326
3327 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3328 unsigned int nlm_flags)
3329 {
3330 struct sk_buff *skb;
3331 struct net *net = info->nl_net;
3332 u32 seq;
3333 int err;
3334
3335 err = -ENOBUFS;
3336 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3337
3338 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3339 if (!skb)
3340 goto errout;
3341
3342 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3343 event, info->portid, seq, 0, 0, nlm_flags);
3344 if (err < 0) {
3345 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3346 WARN_ON(err == -EMSGSIZE);
3347 kfree_skb(skb);
3348 goto errout;
3349 }
3350 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3351 info->nlh, gfp_any());
3352 return;
3353 errout:
3354 if (err < 0)
3355 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3356 }
3357
3358 static int ip6_route_dev_notify(struct notifier_block *this,
3359 unsigned long event, void *ptr)
3360 {
3361 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3362 struct net *net = dev_net(dev);
3363
3364 if (!(dev->flags & IFF_LOOPBACK))
3365 return NOTIFY_OK;
3366
3367 if (event == NETDEV_REGISTER) {
3368 net->ipv6.ip6_null_entry->dst.dev = dev;
3369 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3370 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3371 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3372 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3373 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3374 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3375 #endif
3376 } else if (event == NETDEV_UNREGISTER) {
3377 in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev);
3378 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3379 in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev);
3380 in6_dev_put(net->ipv6.ip6_blk_hole_entry->rt6i_idev);
3381 #endif
3382 }
3383
3384 return NOTIFY_OK;
3385 }
3386
3387 /*
3388 * /proc
3389 */
3390
3391 #ifdef CONFIG_PROC_FS
3392
3393 static const struct file_operations ipv6_route_proc_fops = {
3394 .owner = THIS_MODULE,
3395 .open = ipv6_route_open,
3396 .read = seq_read,
3397 .llseek = seq_lseek,
3398 .release = seq_release_net,
3399 };
3400
3401 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3402 {
3403 struct net *net = (struct net *)seq->private;
3404 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3405 net->ipv6.rt6_stats->fib_nodes,
3406 net->ipv6.rt6_stats->fib_route_nodes,
3407 net->ipv6.rt6_stats->fib_rt_alloc,
3408 net->ipv6.rt6_stats->fib_rt_entries,
3409 net->ipv6.rt6_stats->fib_rt_cache,
3410 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3411 net->ipv6.rt6_stats->fib_discarded_routes);
3412
3413 return 0;
3414 }
3415
3416 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3417 {
3418 return single_open_net(inode, file, rt6_stats_seq_show);
3419 }
3420
3421 static const struct file_operations rt6_stats_seq_fops = {
3422 .owner = THIS_MODULE,
3423 .open = rt6_stats_seq_open,
3424 .read = seq_read,
3425 .llseek = seq_lseek,
3426 .release = single_release_net,
3427 };
3428 #endif /* CONFIG_PROC_FS */
3429
3430 #ifdef CONFIG_SYSCTL
3431
3432 static
3433 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3434 void __user *buffer, size_t *lenp, loff_t *ppos)
3435 {
3436 struct net *net;
3437 int delay;
3438 if (!write)
3439 return -EINVAL;
3440
3441 net = (struct net *)ctl->extra1;
3442 delay = net->ipv6.sysctl.flush_delay;
3443 proc_dointvec(ctl, write, buffer, lenp, ppos);
3444 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3445 return 0;
3446 }
3447
3448 struct ctl_table ipv6_route_table_template[] = {
3449 {
3450 .procname = "flush",
3451 .data = &init_net.ipv6.sysctl.flush_delay,
3452 .maxlen = sizeof(int),
3453 .mode = 0200,
3454 .proc_handler = ipv6_sysctl_rtcache_flush
3455 },
3456 {
3457 .procname = "gc_thresh",
3458 .data = &ip6_dst_ops_template.gc_thresh,
3459 .maxlen = sizeof(int),
3460 .mode = 0644,
3461 .proc_handler = proc_dointvec,
3462 },
3463 {
3464 .procname = "max_size",
3465 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3466 .maxlen = sizeof(int),
3467 .mode = 0644,
3468 .proc_handler = proc_dointvec,
3469 },
3470 {
3471 .procname = "gc_min_interval",
3472 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3473 .maxlen = sizeof(int),
3474 .mode = 0644,
3475 .proc_handler = proc_dointvec_jiffies,
3476 },
3477 {
3478 .procname = "gc_timeout",
3479 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3480 .maxlen = sizeof(int),
3481 .mode = 0644,
3482 .proc_handler = proc_dointvec_jiffies,
3483 },
3484 {
3485 .procname = "gc_interval",
3486 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3487 .maxlen = sizeof(int),
3488 .mode = 0644,
3489 .proc_handler = proc_dointvec_jiffies,
3490 },
3491 {
3492 .procname = "gc_elasticity",
3493 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3494 .maxlen = sizeof(int),
3495 .mode = 0644,
3496 .proc_handler = proc_dointvec,
3497 },
3498 {
3499 .procname = "mtu_expires",
3500 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3501 .maxlen = sizeof(int),
3502 .mode = 0644,
3503 .proc_handler = proc_dointvec_jiffies,
3504 },
3505 {
3506 .procname = "min_adv_mss",
3507 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3508 .maxlen = sizeof(int),
3509 .mode = 0644,
3510 .proc_handler = proc_dointvec,
3511 },
3512 {
3513 .procname = "gc_min_interval_ms",
3514 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3515 .maxlen = sizeof(int),
3516 .mode = 0644,
3517 .proc_handler = proc_dointvec_ms_jiffies,
3518 },
3519 { }
3520 };
3521
3522 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3523 {
3524 struct ctl_table *table;
3525
3526 table = kmemdup(ipv6_route_table_template,
3527 sizeof(ipv6_route_table_template),
3528 GFP_KERNEL);
3529
3530 if (table) {
3531 table[0].data = &net->ipv6.sysctl.flush_delay;
3532 table[0].extra1 = net;
3533 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3534 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3535 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3536 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3537 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3538 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3539 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3540 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3541 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3542
3543 /* Don't export sysctls to unprivileged users */
3544 if (net->user_ns != &init_user_ns)
3545 table[0].procname = NULL;
3546 }
3547
3548 return table;
3549 }
3550 #endif
3551
3552 static int __net_init ip6_route_net_init(struct net *net)
3553 {
3554 int ret = -ENOMEM;
3555
3556 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3557 sizeof(net->ipv6.ip6_dst_ops));
3558
3559 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3560 goto out_ip6_dst_ops;
3561
3562 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3563 sizeof(*net->ipv6.ip6_null_entry),
3564 GFP_KERNEL);
3565 if (!net->ipv6.ip6_null_entry)
3566 goto out_ip6_dst_entries;
3567 net->ipv6.ip6_null_entry->dst.path =
3568 (struct dst_entry *)net->ipv6.ip6_null_entry;
3569 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3570 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3571 ip6_template_metrics, true);
3572
3573 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3574 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3575 sizeof(*net->ipv6.ip6_prohibit_entry),
3576 GFP_KERNEL);
3577 if (!net->ipv6.ip6_prohibit_entry)
3578 goto out_ip6_null_entry;
3579 net->ipv6.ip6_prohibit_entry->dst.path =
3580 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3581 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3582 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3583 ip6_template_metrics, true);
3584
3585 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3586 sizeof(*net->ipv6.ip6_blk_hole_entry),
3587 GFP_KERNEL);
3588 if (!net->ipv6.ip6_blk_hole_entry)
3589 goto out_ip6_prohibit_entry;
3590 net->ipv6.ip6_blk_hole_entry->dst.path =
3591 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3592 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3593 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3594 ip6_template_metrics, true);
3595 #endif
3596
3597 net->ipv6.sysctl.flush_delay = 0;
3598 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3599 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3600 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3601 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3602 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3603 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3604 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3605
3606 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3607
3608 ret = 0;
3609 out:
3610 return ret;
3611
3612 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3613 out_ip6_prohibit_entry:
3614 kfree(net->ipv6.ip6_prohibit_entry);
3615 out_ip6_null_entry:
3616 kfree(net->ipv6.ip6_null_entry);
3617 #endif
3618 out_ip6_dst_entries:
3619 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3620 out_ip6_dst_ops:
3621 goto out;
3622 }
3623
3624 static void __net_exit ip6_route_net_exit(struct net *net)
3625 {
3626 kfree(net->ipv6.ip6_null_entry);
3627 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3628 kfree(net->ipv6.ip6_prohibit_entry);
3629 kfree(net->ipv6.ip6_blk_hole_entry);
3630 #endif
3631 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3632 }
3633
3634 static int __net_init ip6_route_net_init_late(struct net *net)
3635 {
3636 #ifdef CONFIG_PROC_FS
3637 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3638 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3639 #endif
3640 return 0;
3641 }
3642
3643 static void __net_exit ip6_route_net_exit_late(struct net *net)
3644 {
3645 #ifdef CONFIG_PROC_FS
3646 remove_proc_entry("ipv6_route", net->proc_net);
3647 remove_proc_entry("rt6_stats", net->proc_net);
3648 #endif
3649 }
3650
3651 static struct pernet_operations ip6_route_net_ops = {
3652 .init = ip6_route_net_init,
3653 .exit = ip6_route_net_exit,
3654 };
3655
3656 static int __net_init ipv6_inetpeer_init(struct net *net)
3657 {
3658 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3659
3660 if (!bp)
3661 return -ENOMEM;
3662 inet_peer_base_init(bp);
3663 net->ipv6.peers = bp;
3664 return 0;
3665 }
3666
3667 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3668 {
3669 struct inet_peer_base *bp = net->ipv6.peers;
3670
3671 net->ipv6.peers = NULL;
3672 inetpeer_invalidate_tree(bp);
3673 kfree(bp);
3674 }
3675
3676 static struct pernet_operations ipv6_inetpeer_ops = {
3677 .init = ipv6_inetpeer_init,
3678 .exit = ipv6_inetpeer_exit,
3679 };
3680
3681 static struct pernet_operations ip6_route_net_late_ops = {
3682 .init = ip6_route_net_init_late,
3683 .exit = ip6_route_net_exit_late,
3684 };
3685
3686 static struct notifier_block ip6_route_dev_notifier = {
3687 .notifier_call = ip6_route_dev_notify,
3688 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
3689 };
3690
3691 void __init ip6_route_init_special_entries(void)
3692 {
3693 /* Registering of the loopback is done before this portion of code,
3694 * the loopback reference in rt6_info will not be taken, do it
3695 * manually for init_net */
3696 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3697 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3698 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3699 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3700 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3701 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3702 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3703 #endif
3704 }
3705
3706 int __init ip6_route_init(void)
3707 {
3708 int ret;
3709 int cpu;
3710
3711 ret = -ENOMEM;
3712 ip6_dst_ops_template.kmem_cachep =
3713 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3714 SLAB_HWCACHE_ALIGN, NULL);
3715 if (!ip6_dst_ops_template.kmem_cachep)
3716 goto out;
3717
3718 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3719 if (ret)
3720 goto out_kmem_cache;
3721
3722 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3723 if (ret)
3724 goto out_dst_entries;
3725
3726 ret = register_pernet_subsys(&ip6_route_net_ops);
3727 if (ret)
3728 goto out_register_inetpeer;
3729
3730 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3731
3732 ret = fib6_init();
3733 if (ret)
3734 goto out_register_subsys;
3735
3736 ret = xfrm6_init();
3737 if (ret)
3738 goto out_fib6_init;
3739
3740 ret = fib6_rules_init();
3741 if (ret)
3742 goto xfrm6_init;
3743
3744 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3745 if (ret)
3746 goto fib6_rules_init;
3747
3748 ret = -ENOBUFS;
3749 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3750 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3751 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3752 goto out_register_late_subsys;
3753
3754 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3755 if (ret)
3756 goto out_register_late_subsys;
3757
3758 for_each_possible_cpu(cpu) {
3759 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3760
3761 INIT_LIST_HEAD(&ul->head);
3762 spin_lock_init(&ul->lock);
3763 }
3764
3765 out:
3766 return ret;
3767
3768 out_register_late_subsys:
3769 unregister_pernet_subsys(&ip6_route_net_late_ops);
3770 fib6_rules_init:
3771 fib6_rules_cleanup();
3772 xfrm6_init:
3773 xfrm6_fini();
3774 out_fib6_init:
3775 fib6_gc_cleanup();
3776 out_register_subsys:
3777 unregister_pernet_subsys(&ip6_route_net_ops);
3778 out_register_inetpeer:
3779 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3780 out_dst_entries:
3781 dst_entries_destroy(&ip6_dst_blackhole_ops);
3782 out_kmem_cache:
3783 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3784 goto out;
3785 }
3786
3787 void ip6_route_cleanup(void)
3788 {
3789 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3790 unregister_pernet_subsys(&ip6_route_net_late_ops);
3791 fib6_rules_cleanup();
3792 xfrm6_fini();
3793 fib6_gc_cleanup();
3794 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3795 unregister_pernet_subsys(&ip6_route_net_ops);
3796 dst_entries_destroy(&ip6_dst_blackhole_ops);
3797 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3798 }