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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / route.c
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/dst_metadata.h>
58 #include <net/xfrm.h>
59 #include <net/netevent.h>
60 #include <net/netlink.h>
61 #include <net/nexthop.h>
62 #include <net/lwtunnel.h>
63 #include <net/ip_tunnels.h>
64 #include <net/l3mdev.h>
65 #include <trace/events/fib6.h>
66
67 #include <asm/uaccess.h>
68
69 #ifdef CONFIG_SYSCTL
70 #include <linux/sysctl.h>
71 #endif
72
73 enum rt6_nud_state {
74 RT6_NUD_FAIL_HARD = -3,
75 RT6_NUD_FAIL_PROBE = -2,
76 RT6_NUD_FAIL_DO_RR = -1,
77 RT6_NUD_SUCCEED = 1
78 };
79
80 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
81 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
82 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
83 static unsigned int ip6_mtu(const struct dst_entry *dst);
84 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
85 static void ip6_dst_destroy(struct dst_entry *);
86 static void ip6_dst_ifdown(struct dst_entry *,
87 struct net_device *dev, int how);
88 static int ip6_dst_gc(struct dst_ops *ops);
89
90 static int ip6_pkt_discard(struct sk_buff *skb);
91 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
92 static int ip6_pkt_prohibit(struct sk_buff *skb);
93 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
94 static void ip6_link_failure(struct sk_buff *skb);
95 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb, u32 mtu);
97 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb);
99 static void rt6_dst_from_metrics_check(struct rt6_info *rt);
100 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
101
102 #ifdef CONFIG_IPV6_ROUTE_INFO
103 static struct rt6_info *rt6_add_route_info(struct net *net,
104 const struct in6_addr *prefix, int prefixlen,
105 const struct in6_addr *gwaddr, int ifindex,
106 unsigned int pref);
107 static struct rt6_info *rt6_get_route_info(struct net *net,
108 const struct in6_addr *prefix, int prefixlen,
109 const struct in6_addr *gwaddr, int ifindex);
110 #endif
111
112 struct uncached_list {
113 spinlock_t lock;
114 struct list_head head;
115 };
116
117 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
118
119 static void rt6_uncached_list_add(struct rt6_info *rt)
120 {
121 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
122
123 rt->dst.flags |= DST_NOCACHE;
124 rt->rt6i_uncached_list = ul;
125
126 spin_lock_bh(&ul->lock);
127 list_add_tail(&rt->rt6i_uncached, &ul->head);
128 spin_unlock_bh(&ul->lock);
129 }
130
131 static void rt6_uncached_list_del(struct rt6_info *rt)
132 {
133 if (!list_empty(&rt->rt6i_uncached)) {
134 struct uncached_list *ul = rt->rt6i_uncached_list;
135
136 spin_lock_bh(&ul->lock);
137 list_del(&rt->rt6i_uncached);
138 spin_unlock_bh(&ul->lock);
139 }
140 }
141
142 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
143 {
144 struct net_device *loopback_dev = net->loopback_dev;
145 int cpu;
146
147 if (dev == loopback_dev)
148 return;
149
150 for_each_possible_cpu(cpu) {
151 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
152 struct rt6_info *rt;
153
154 spin_lock_bh(&ul->lock);
155 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
156 struct inet6_dev *rt_idev = rt->rt6i_idev;
157 struct net_device *rt_dev = rt->dst.dev;
158
159 if (rt_idev->dev == dev) {
160 rt->rt6i_idev = in6_dev_get(loopback_dev);
161 in6_dev_put(rt_idev);
162 }
163
164 if (rt_dev == dev) {
165 rt->dst.dev = loopback_dev;
166 dev_hold(rt->dst.dev);
167 dev_put(rt_dev);
168 }
169 }
170 spin_unlock_bh(&ul->lock);
171 }
172 }
173
174 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
175 {
176 return dst_metrics_write_ptr(rt->dst.from);
177 }
178
179 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
180 {
181 struct rt6_info *rt = (struct rt6_info *)dst;
182
183 if (rt->rt6i_flags & RTF_PCPU)
184 return rt6_pcpu_cow_metrics(rt);
185 else if (rt->rt6i_flags & RTF_CACHE)
186 return NULL;
187 else
188 return dst_cow_metrics_generic(dst, old);
189 }
190
191 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
192 struct sk_buff *skb,
193 const void *daddr)
194 {
195 struct in6_addr *p = &rt->rt6i_gateway;
196
197 if (!ipv6_addr_any(p))
198 return (const void *) p;
199 else if (skb)
200 return &ipv6_hdr(skb)->daddr;
201 return daddr;
202 }
203
204 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
205 struct sk_buff *skb,
206 const void *daddr)
207 {
208 struct rt6_info *rt = (struct rt6_info *) dst;
209 struct neighbour *n;
210
211 daddr = choose_neigh_daddr(rt, skb, daddr);
212 n = __ipv6_neigh_lookup(dst->dev, daddr);
213 if (n)
214 return n;
215 return neigh_create(&nd_tbl, daddr, dst->dev);
216 }
217
218 static struct dst_ops ip6_dst_ops_template = {
219 .family = AF_INET6,
220 .gc = ip6_dst_gc,
221 .gc_thresh = 1024,
222 .check = ip6_dst_check,
223 .default_advmss = ip6_default_advmss,
224 .mtu = ip6_mtu,
225 .cow_metrics = ipv6_cow_metrics,
226 .destroy = ip6_dst_destroy,
227 .ifdown = ip6_dst_ifdown,
228 .negative_advice = ip6_negative_advice,
229 .link_failure = ip6_link_failure,
230 .update_pmtu = ip6_rt_update_pmtu,
231 .redirect = rt6_do_redirect,
232 .local_out = __ip6_local_out,
233 .neigh_lookup = ip6_neigh_lookup,
234 };
235
236 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
237 {
238 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
239
240 return mtu ? : dst->dev->mtu;
241 }
242
243 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
244 struct sk_buff *skb, u32 mtu)
245 {
246 }
247
248 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
249 struct sk_buff *skb)
250 {
251 }
252
253 static struct dst_ops ip6_dst_blackhole_ops = {
254 .family = AF_INET6,
255 .destroy = ip6_dst_destroy,
256 .check = ip6_dst_check,
257 .mtu = ip6_blackhole_mtu,
258 .default_advmss = ip6_default_advmss,
259 .update_pmtu = ip6_rt_blackhole_update_pmtu,
260 .redirect = ip6_rt_blackhole_redirect,
261 .cow_metrics = dst_cow_metrics_generic,
262 .neigh_lookup = ip6_neigh_lookup,
263 };
264
265 static const u32 ip6_template_metrics[RTAX_MAX] = {
266 [RTAX_HOPLIMIT - 1] = 0,
267 };
268
269 static const struct rt6_info ip6_null_entry_template = {
270 .dst = {
271 .__refcnt = ATOMIC_INIT(1),
272 .__use = 1,
273 .obsolete = DST_OBSOLETE_FORCE_CHK,
274 .error = -ENETUNREACH,
275 .input = ip6_pkt_discard,
276 .output = ip6_pkt_discard_out,
277 },
278 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
279 .rt6i_protocol = RTPROT_KERNEL,
280 .rt6i_metric = ~(u32) 0,
281 .rt6i_ref = ATOMIC_INIT(1),
282 };
283
284 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
285
286 static const struct rt6_info ip6_prohibit_entry_template = {
287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
290 .obsolete = DST_OBSOLETE_FORCE_CHK,
291 .error = -EACCES,
292 .input = ip6_pkt_prohibit,
293 .output = ip6_pkt_prohibit_out,
294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
296 .rt6i_protocol = RTPROT_KERNEL,
297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299 };
300
301 static const struct rt6_info ip6_blk_hole_entry_template = {
302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
305 .obsolete = DST_OBSOLETE_FORCE_CHK,
306 .error = -EINVAL,
307 .input = dst_discard,
308 .output = dst_discard_out,
309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
311 .rt6i_protocol = RTPROT_KERNEL,
312 .rt6i_metric = ~(u32) 0,
313 .rt6i_ref = ATOMIC_INIT(1),
314 };
315
316 #endif
317
318 static void rt6_info_init(struct rt6_info *rt)
319 {
320 struct dst_entry *dst = &rt->dst;
321
322 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
323 INIT_LIST_HEAD(&rt->rt6i_siblings);
324 INIT_LIST_HEAD(&rt->rt6i_uncached);
325 }
326
327 /* allocate dst with ip6_dst_ops */
328 static struct rt6_info *__ip6_dst_alloc(struct net *net,
329 struct net_device *dev,
330 int flags)
331 {
332 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
333 0, DST_OBSOLETE_FORCE_CHK, flags);
334
335 if (rt)
336 rt6_info_init(rt);
337
338 return rt;
339 }
340
341 struct rt6_info *ip6_dst_alloc(struct net *net,
342 struct net_device *dev,
343 int flags)
344 {
345 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
346
347 if (rt) {
348 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
349 if (rt->rt6i_pcpu) {
350 int cpu;
351
352 for_each_possible_cpu(cpu) {
353 struct rt6_info **p;
354
355 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
356 /* no one shares rt */
357 *p = NULL;
358 }
359 } else {
360 dst_destroy((struct dst_entry *)rt);
361 return NULL;
362 }
363 }
364
365 return rt;
366 }
367 EXPORT_SYMBOL(ip6_dst_alloc);
368
369 static void ip6_dst_destroy(struct dst_entry *dst)
370 {
371 struct rt6_info *rt = (struct rt6_info *)dst;
372 struct dst_entry *from = dst->from;
373 struct inet6_dev *idev;
374
375 dst_destroy_metrics_generic(dst);
376 free_percpu(rt->rt6i_pcpu);
377 rt6_uncached_list_del(rt);
378
379 idev = rt->rt6i_idev;
380 if (idev) {
381 rt->rt6i_idev = NULL;
382 in6_dev_put(idev);
383 }
384
385 dst->from = NULL;
386 dst_release(from);
387 }
388
389 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
390 int how)
391 {
392 struct rt6_info *rt = (struct rt6_info *)dst;
393 struct inet6_dev *idev = rt->rt6i_idev;
394 struct net_device *loopback_dev =
395 dev_net(dev)->loopback_dev;
396
397 if (dev != loopback_dev) {
398 if (idev && idev->dev == dev) {
399 struct inet6_dev *loopback_idev =
400 in6_dev_get(loopback_dev);
401 if (loopback_idev) {
402 rt->rt6i_idev = loopback_idev;
403 in6_dev_put(idev);
404 }
405 }
406 }
407 }
408
409 static bool __rt6_check_expired(const struct rt6_info *rt)
410 {
411 if (rt->rt6i_flags & RTF_EXPIRES)
412 return time_after(jiffies, rt->dst.expires);
413 else
414 return false;
415 }
416
417 static bool rt6_check_expired(const struct rt6_info *rt)
418 {
419 if (rt->rt6i_flags & RTF_EXPIRES) {
420 if (time_after(jiffies, rt->dst.expires))
421 return true;
422 } else if (rt->dst.from) {
423 return rt6_check_expired((struct rt6_info *) rt->dst.from);
424 }
425 return false;
426 }
427
428 /* Multipath route selection:
429 * Hash based function using packet header and flowlabel.
430 * Adapted from fib_info_hashfn()
431 */
432 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
433 const struct flowi6 *fl6)
434 {
435 return get_hash_from_flowi6(fl6) % candidate_count;
436 }
437
438 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
439 struct flowi6 *fl6, int oif,
440 int strict)
441 {
442 struct rt6_info *sibling, *next_sibling;
443 int route_choosen;
444
445 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
446 /* Don't change the route, if route_choosen == 0
447 * (siblings does not include ourself)
448 */
449 if (route_choosen)
450 list_for_each_entry_safe(sibling, next_sibling,
451 &match->rt6i_siblings, rt6i_siblings) {
452 route_choosen--;
453 if (route_choosen == 0) {
454 if (rt6_score_route(sibling, oif, strict) < 0)
455 break;
456 match = sibling;
457 break;
458 }
459 }
460 return match;
461 }
462
463 /*
464 * Route lookup. Any table->tb6_lock is implied.
465 */
466
467 static inline struct rt6_info *rt6_device_match(struct net *net,
468 struct rt6_info *rt,
469 const struct in6_addr *saddr,
470 int oif,
471 int flags)
472 {
473 struct rt6_info *local = NULL;
474 struct rt6_info *sprt;
475
476 if (!oif && ipv6_addr_any(saddr))
477 goto out;
478
479 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
480 struct net_device *dev = sprt->dst.dev;
481
482 if (oif) {
483 if (dev->ifindex == oif)
484 return sprt;
485 if (dev->flags & IFF_LOOPBACK) {
486 if (!sprt->rt6i_idev ||
487 sprt->rt6i_idev->dev->ifindex != oif) {
488 if (flags & RT6_LOOKUP_F_IFACE)
489 continue;
490 if (local &&
491 local->rt6i_idev->dev->ifindex == oif)
492 continue;
493 }
494 local = sprt;
495 }
496 } else {
497 if (ipv6_chk_addr(net, saddr, dev,
498 flags & RT6_LOOKUP_F_IFACE))
499 return sprt;
500 }
501 }
502
503 if (oif) {
504 if (local)
505 return local;
506
507 if (flags & RT6_LOOKUP_F_IFACE)
508 return net->ipv6.ip6_null_entry;
509 }
510 out:
511 return rt;
512 }
513
514 #ifdef CONFIG_IPV6_ROUTER_PREF
515 struct __rt6_probe_work {
516 struct work_struct work;
517 struct in6_addr target;
518 struct net_device *dev;
519 };
520
521 static void rt6_probe_deferred(struct work_struct *w)
522 {
523 struct in6_addr mcaddr;
524 struct __rt6_probe_work *work =
525 container_of(w, struct __rt6_probe_work, work);
526
527 addrconf_addr_solict_mult(&work->target, &mcaddr);
528 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
529 dev_put(work->dev);
530 kfree(work);
531 }
532
533 static void rt6_probe(struct rt6_info *rt)
534 {
535 struct __rt6_probe_work *work;
536 struct neighbour *neigh;
537 /*
538 * Okay, this does not seem to be appropriate
539 * for now, however, we need to check if it
540 * is really so; aka Router Reachability Probing.
541 *
542 * Router Reachability Probe MUST be rate-limited
543 * to no more than one per minute.
544 */
545 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
546 return;
547 rcu_read_lock_bh();
548 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
549 if (neigh) {
550 if (neigh->nud_state & NUD_VALID)
551 goto out;
552
553 work = NULL;
554 write_lock(&neigh->lock);
555 if (!(neigh->nud_state & NUD_VALID) &&
556 time_after(jiffies,
557 neigh->updated +
558 rt->rt6i_idev->cnf.rtr_probe_interval)) {
559 work = kmalloc(sizeof(*work), GFP_ATOMIC);
560 if (work)
561 __neigh_set_probe_once(neigh);
562 }
563 write_unlock(&neigh->lock);
564 } else {
565 work = kmalloc(sizeof(*work), GFP_ATOMIC);
566 }
567
568 if (work) {
569 INIT_WORK(&work->work, rt6_probe_deferred);
570 work->target = rt->rt6i_gateway;
571 dev_hold(rt->dst.dev);
572 work->dev = rt->dst.dev;
573 schedule_work(&work->work);
574 }
575
576 out:
577 rcu_read_unlock_bh();
578 }
579 #else
580 static inline void rt6_probe(struct rt6_info *rt)
581 {
582 }
583 #endif
584
585 /*
586 * Default Router Selection (RFC 2461 6.3.6)
587 */
588 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
589 {
590 struct net_device *dev = rt->dst.dev;
591 if (!oif || dev->ifindex == oif)
592 return 2;
593 if ((dev->flags & IFF_LOOPBACK) &&
594 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
595 return 1;
596 return 0;
597 }
598
599 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
600 {
601 struct neighbour *neigh;
602 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
603
604 if (rt->rt6i_flags & RTF_NONEXTHOP ||
605 !(rt->rt6i_flags & RTF_GATEWAY))
606 return RT6_NUD_SUCCEED;
607
608 rcu_read_lock_bh();
609 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
610 if (neigh) {
611 read_lock(&neigh->lock);
612 if (neigh->nud_state & NUD_VALID)
613 ret = RT6_NUD_SUCCEED;
614 #ifdef CONFIG_IPV6_ROUTER_PREF
615 else if (!(neigh->nud_state & NUD_FAILED))
616 ret = RT6_NUD_SUCCEED;
617 else
618 ret = RT6_NUD_FAIL_PROBE;
619 #endif
620 read_unlock(&neigh->lock);
621 } else {
622 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
623 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
624 }
625 rcu_read_unlock_bh();
626
627 return ret;
628 }
629
630 static int rt6_score_route(struct rt6_info *rt, int oif,
631 int strict)
632 {
633 int m;
634
635 m = rt6_check_dev(rt, oif);
636 if (!m && (strict & RT6_LOOKUP_F_IFACE))
637 return RT6_NUD_FAIL_HARD;
638 #ifdef CONFIG_IPV6_ROUTER_PREF
639 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
640 #endif
641 if (strict & RT6_LOOKUP_F_REACHABLE) {
642 int n = rt6_check_neigh(rt);
643 if (n < 0)
644 return n;
645 }
646 return m;
647 }
648
649 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
650 int *mpri, struct rt6_info *match,
651 bool *do_rr)
652 {
653 int m;
654 bool match_do_rr = false;
655 struct inet6_dev *idev = rt->rt6i_idev;
656 struct net_device *dev = rt->dst.dev;
657
658 if (dev && !netif_carrier_ok(dev) &&
659 idev->cnf.ignore_routes_with_linkdown)
660 goto out;
661
662 if (rt6_check_expired(rt))
663 goto out;
664
665 m = rt6_score_route(rt, oif, strict);
666 if (m == RT6_NUD_FAIL_DO_RR) {
667 match_do_rr = true;
668 m = 0; /* lowest valid score */
669 } else if (m == RT6_NUD_FAIL_HARD) {
670 goto out;
671 }
672
673 if (strict & RT6_LOOKUP_F_REACHABLE)
674 rt6_probe(rt);
675
676 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
677 if (m > *mpri) {
678 *do_rr = match_do_rr;
679 *mpri = m;
680 match = rt;
681 }
682 out:
683 return match;
684 }
685
686 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
687 struct rt6_info *rr_head,
688 u32 metric, int oif, int strict,
689 bool *do_rr)
690 {
691 struct rt6_info *rt, *match, *cont;
692 int mpri = -1;
693
694 match = NULL;
695 cont = NULL;
696 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
697 if (rt->rt6i_metric != metric) {
698 cont = rt;
699 break;
700 }
701
702 match = find_match(rt, oif, strict, &mpri, match, do_rr);
703 }
704
705 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
706 if (rt->rt6i_metric != metric) {
707 cont = rt;
708 break;
709 }
710
711 match = find_match(rt, oif, strict, &mpri, match, do_rr);
712 }
713
714 if (match || !cont)
715 return match;
716
717 for (rt = cont; rt; rt = rt->dst.rt6_next)
718 match = find_match(rt, oif, strict, &mpri, match, do_rr);
719
720 return match;
721 }
722
723 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
724 {
725 struct rt6_info *match, *rt0;
726 struct net *net;
727 bool do_rr = false;
728
729 rt0 = fn->rr_ptr;
730 if (!rt0)
731 fn->rr_ptr = rt0 = fn->leaf;
732
733 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
734 &do_rr);
735
736 if (do_rr) {
737 struct rt6_info *next = rt0->dst.rt6_next;
738
739 /* no entries matched; do round-robin */
740 if (!next || next->rt6i_metric != rt0->rt6i_metric)
741 next = fn->leaf;
742
743 if (next != rt0)
744 fn->rr_ptr = next;
745 }
746
747 net = dev_net(rt0->dst.dev);
748 return match ? match : net->ipv6.ip6_null_entry;
749 }
750
751 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
752 {
753 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
754 }
755
756 #ifdef CONFIG_IPV6_ROUTE_INFO
757 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
758 const struct in6_addr *gwaddr)
759 {
760 struct net *net = dev_net(dev);
761 struct route_info *rinfo = (struct route_info *) opt;
762 struct in6_addr prefix_buf, *prefix;
763 unsigned int pref;
764 unsigned long lifetime;
765 struct rt6_info *rt;
766
767 if (len < sizeof(struct route_info)) {
768 return -EINVAL;
769 }
770
771 /* Sanity check for prefix_len and length */
772 if (rinfo->length > 3) {
773 return -EINVAL;
774 } else if (rinfo->prefix_len > 128) {
775 return -EINVAL;
776 } else if (rinfo->prefix_len > 64) {
777 if (rinfo->length < 2) {
778 return -EINVAL;
779 }
780 } else if (rinfo->prefix_len > 0) {
781 if (rinfo->length < 1) {
782 return -EINVAL;
783 }
784 }
785
786 pref = rinfo->route_pref;
787 if (pref == ICMPV6_ROUTER_PREF_INVALID)
788 return -EINVAL;
789
790 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
791
792 if (rinfo->length == 3)
793 prefix = (struct in6_addr *)rinfo->prefix;
794 else {
795 /* this function is safe */
796 ipv6_addr_prefix(&prefix_buf,
797 (struct in6_addr *)rinfo->prefix,
798 rinfo->prefix_len);
799 prefix = &prefix_buf;
800 }
801
802 if (rinfo->prefix_len == 0)
803 rt = rt6_get_dflt_router(gwaddr, dev);
804 else
805 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
806 gwaddr, dev->ifindex);
807
808 if (rt && !lifetime) {
809 ip6_del_rt(rt);
810 rt = NULL;
811 }
812
813 if (!rt && lifetime)
814 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
815 pref);
816 else if (rt)
817 rt->rt6i_flags = RTF_ROUTEINFO |
818 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
819
820 if (rt) {
821 if (!addrconf_finite_timeout(lifetime))
822 rt6_clean_expires(rt);
823 else
824 rt6_set_expires(rt, jiffies + HZ * lifetime);
825
826 ip6_rt_put(rt);
827 }
828 return 0;
829 }
830 #endif
831
832 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
833 struct in6_addr *saddr)
834 {
835 struct fib6_node *pn;
836 while (1) {
837 if (fn->fn_flags & RTN_TL_ROOT)
838 return NULL;
839 pn = fn->parent;
840 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
841 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
842 else
843 fn = pn;
844 if (fn->fn_flags & RTN_RTINFO)
845 return fn;
846 }
847 }
848
849 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
850 struct fib6_table *table,
851 struct flowi6 *fl6, int flags)
852 {
853 struct fib6_node *fn;
854 struct rt6_info *rt;
855
856 read_lock_bh(&table->tb6_lock);
857 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
858 restart:
859 rt = fn->leaf;
860 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
861 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
862 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
863 if (rt == net->ipv6.ip6_null_entry) {
864 fn = fib6_backtrack(fn, &fl6->saddr);
865 if (fn)
866 goto restart;
867 }
868 dst_use(&rt->dst, jiffies);
869 read_unlock_bh(&table->tb6_lock);
870
871 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
872
873 return rt;
874
875 }
876
877 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
878 int flags)
879 {
880 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
881 }
882 EXPORT_SYMBOL_GPL(ip6_route_lookup);
883
884 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
885 const struct in6_addr *saddr, int oif, int strict)
886 {
887 struct flowi6 fl6 = {
888 .flowi6_oif = oif,
889 .daddr = *daddr,
890 };
891 struct dst_entry *dst;
892 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
893
894 if (saddr) {
895 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
896 flags |= RT6_LOOKUP_F_HAS_SADDR;
897 }
898
899 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
900 if (dst->error == 0)
901 return (struct rt6_info *) dst;
902
903 dst_release(dst);
904
905 return NULL;
906 }
907 EXPORT_SYMBOL(rt6_lookup);
908
909 /* ip6_ins_rt is called with FREE table->tb6_lock.
910 It takes new route entry, the addition fails by any reason the
911 route is freed. In any case, if caller does not hold it, it may
912 be destroyed.
913 */
914
915 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
916 struct mx6_config *mxc)
917 {
918 int err;
919 struct fib6_table *table;
920
921 table = rt->rt6i_table;
922 write_lock_bh(&table->tb6_lock);
923 err = fib6_add(&table->tb6_root, rt, info, mxc);
924 write_unlock_bh(&table->tb6_lock);
925
926 return err;
927 }
928
929 int ip6_ins_rt(struct rt6_info *rt)
930 {
931 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
932 struct mx6_config mxc = { .mx = NULL, };
933
934 return __ip6_ins_rt(rt, &info, &mxc);
935 }
936
937 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
938 const struct in6_addr *daddr,
939 const struct in6_addr *saddr)
940 {
941 struct rt6_info *rt;
942
943 /*
944 * Clone the route.
945 */
946
947 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
948 ort = (struct rt6_info *)ort->dst.from;
949
950 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
951
952 if (!rt)
953 return NULL;
954
955 ip6_rt_copy_init(rt, ort);
956 rt->rt6i_flags |= RTF_CACHE;
957 rt->rt6i_metric = 0;
958 rt->dst.flags |= DST_HOST;
959 rt->rt6i_dst.addr = *daddr;
960 rt->rt6i_dst.plen = 128;
961
962 if (!rt6_is_gw_or_nonexthop(ort)) {
963 if (ort->rt6i_dst.plen != 128 &&
964 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
965 rt->rt6i_flags |= RTF_ANYCAST;
966 #ifdef CONFIG_IPV6_SUBTREES
967 if (rt->rt6i_src.plen && saddr) {
968 rt->rt6i_src.addr = *saddr;
969 rt->rt6i_src.plen = 128;
970 }
971 #endif
972 }
973
974 return rt;
975 }
976
977 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
978 {
979 struct rt6_info *pcpu_rt;
980
981 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
982 rt->dst.dev, rt->dst.flags);
983
984 if (!pcpu_rt)
985 return NULL;
986 ip6_rt_copy_init(pcpu_rt, rt);
987 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
988 pcpu_rt->rt6i_flags |= RTF_PCPU;
989 return pcpu_rt;
990 }
991
992 /* It should be called with read_lock_bh(&tb6_lock) acquired */
993 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
994 {
995 struct rt6_info *pcpu_rt, **p;
996
997 p = this_cpu_ptr(rt->rt6i_pcpu);
998 pcpu_rt = *p;
999
1000 if (pcpu_rt) {
1001 dst_hold(&pcpu_rt->dst);
1002 rt6_dst_from_metrics_check(pcpu_rt);
1003 }
1004 return pcpu_rt;
1005 }
1006
1007 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1008 {
1009 struct fib6_table *table = rt->rt6i_table;
1010 struct rt6_info *pcpu_rt, *prev, **p;
1011
1012 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1013 if (!pcpu_rt) {
1014 struct net *net = dev_net(rt->dst.dev);
1015
1016 dst_hold(&net->ipv6.ip6_null_entry->dst);
1017 return net->ipv6.ip6_null_entry;
1018 }
1019
1020 read_lock_bh(&table->tb6_lock);
1021 if (rt->rt6i_pcpu) {
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 prev = cmpxchg(p, NULL, pcpu_rt);
1024 if (prev) {
1025 /* If someone did it before us, return prev instead */
1026 dst_destroy(&pcpu_rt->dst);
1027 pcpu_rt = prev;
1028 }
1029 } else {
1030 /* rt has been removed from the fib6 tree
1031 * before we have a chance to acquire the read_lock.
1032 * In this case, don't brother to create a pcpu rt
1033 * since rt is going away anyway. The next
1034 * dst_check() will trigger a re-lookup.
1035 */
1036 dst_destroy(&pcpu_rt->dst);
1037 pcpu_rt = rt;
1038 }
1039 dst_hold(&pcpu_rt->dst);
1040 rt6_dst_from_metrics_check(pcpu_rt);
1041 read_unlock_bh(&table->tb6_lock);
1042 return pcpu_rt;
1043 }
1044
1045 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1046 struct flowi6 *fl6, int flags)
1047 {
1048 struct fib6_node *fn, *saved_fn;
1049 struct rt6_info *rt;
1050 int strict = 0;
1051
1052 strict |= flags & RT6_LOOKUP_F_IFACE;
1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1055
1056 read_lock_bh(&table->tb6_lock);
1057
1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1059 saved_fn = fn;
1060
1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
1064 redo_rt6_select:
1065 rt = rt6_select(fn, oif, strict);
1066 if (rt->rt6i_nsiblings)
1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
1077 }
1078 }
1079
1080
1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1088 return rt;
1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
1104
1105 if (uncached_rt)
1106 rt6_uncached_list_add(uncached_rt);
1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
1109
1110 dst_hold(&uncached_rt->dst);
1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
1113 return uncached_rt;
1114
1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
1123
1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
1133 pcpu_rt = rt6_make_pcpu_route(rt);
1134 dst_release(&rt->dst);
1135 }
1136
1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
1138 return pcpu_rt;
1139
1140 }
1141 }
1142
1143 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1144 struct flowi6 *fl6, int flags)
1145 {
1146 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1147 }
1148
1149 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1150 struct net_device *dev,
1151 struct flowi6 *fl6, int flags)
1152 {
1153 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1154 flags |= RT6_LOOKUP_F_IFACE;
1155
1156 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1157 }
1158
1159 void ip6_route_input(struct sk_buff *skb)
1160 {
1161 const struct ipv6hdr *iph = ipv6_hdr(skb);
1162 struct net *net = dev_net(skb->dev);
1163 int flags = RT6_LOOKUP_F_HAS_SADDR;
1164 struct ip_tunnel_info *tun_info;
1165 struct flowi6 fl6 = {
1166 .flowi6_iif = l3mdev_fib_oif(skb->dev),
1167 .daddr = iph->daddr,
1168 .saddr = iph->saddr,
1169 .flowlabel = ip6_flowinfo(iph),
1170 .flowi6_mark = skb->mark,
1171 .flowi6_proto = iph->nexthdr,
1172 };
1173
1174 tun_info = skb_tunnel_info(skb);
1175 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1176 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1177 skb_dst_drop(skb);
1178 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1179 }
1180
1181 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1182 struct flowi6 *fl6, int flags)
1183 {
1184 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1185 }
1186
1187 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1188 struct flowi6 *fl6, int flags)
1189 {
1190 struct dst_entry *dst;
1191 bool any_src;
1192
1193 dst = l3mdev_get_rt6_dst(net, fl6);
1194 if (dst)
1195 return dst;
1196
1197 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1198
1199 any_src = ipv6_addr_any(&fl6->saddr);
1200 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1201 (fl6->flowi6_oif && any_src))
1202 flags |= RT6_LOOKUP_F_IFACE;
1203
1204 if (!any_src)
1205 flags |= RT6_LOOKUP_F_HAS_SADDR;
1206 else if (sk)
1207 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1208
1209 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1210 }
1211 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1212
1213 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1214 {
1215 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1216 struct dst_entry *new = NULL;
1217
1218 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1219 if (rt) {
1220 rt6_info_init(rt);
1221
1222 new = &rt->dst;
1223 new->__use = 1;
1224 new->input = dst_discard;
1225 new->output = dst_discard_out;
1226
1227 dst_copy_metrics(new, &ort->dst);
1228 rt->rt6i_idev = ort->rt6i_idev;
1229 if (rt->rt6i_idev)
1230 in6_dev_hold(rt->rt6i_idev);
1231
1232 rt->rt6i_gateway = ort->rt6i_gateway;
1233 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1234 rt->rt6i_metric = 0;
1235
1236 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1237 #ifdef CONFIG_IPV6_SUBTREES
1238 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1239 #endif
1240
1241 dst_free(new);
1242 }
1243
1244 dst_release(dst_orig);
1245 return new ? new : ERR_PTR(-ENOMEM);
1246 }
1247
1248 /*
1249 * Destination cache support functions
1250 */
1251
1252 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1253 {
1254 if (rt->dst.from &&
1255 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1256 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1257 }
1258
1259 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1260 {
1261 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1262 return NULL;
1263
1264 if (rt6_check_expired(rt))
1265 return NULL;
1266
1267 return &rt->dst;
1268 }
1269
1270 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1271 {
1272 if (!__rt6_check_expired(rt) &&
1273 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1274 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1275 return &rt->dst;
1276 else
1277 return NULL;
1278 }
1279
1280 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1281 {
1282 struct rt6_info *rt;
1283
1284 rt = (struct rt6_info *) dst;
1285
1286 /* All IPV6 dsts are created with ->obsolete set to the value
1287 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1288 * into this function always.
1289 */
1290
1291 rt6_dst_from_metrics_check(rt);
1292
1293 if (rt->rt6i_flags & RTF_PCPU ||
1294 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1295 return rt6_dst_from_check(rt, cookie);
1296 else
1297 return rt6_check(rt, cookie);
1298 }
1299
1300 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1301 {
1302 struct rt6_info *rt = (struct rt6_info *) dst;
1303
1304 if (rt) {
1305 if (rt->rt6i_flags & RTF_CACHE) {
1306 if (rt6_check_expired(rt)) {
1307 ip6_del_rt(rt);
1308 dst = NULL;
1309 }
1310 } else {
1311 dst_release(dst);
1312 dst = NULL;
1313 }
1314 }
1315 return dst;
1316 }
1317
1318 static void ip6_link_failure(struct sk_buff *skb)
1319 {
1320 struct rt6_info *rt;
1321
1322 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1323
1324 rt = (struct rt6_info *) skb_dst(skb);
1325 if (rt) {
1326 if (rt->rt6i_flags & RTF_CACHE) {
1327 dst_hold(&rt->dst);
1328 ip6_del_rt(rt);
1329 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1330 rt->rt6i_node->fn_sernum = -1;
1331 }
1332 }
1333 }
1334
1335 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1336 {
1337 struct net *net = dev_net(rt->dst.dev);
1338
1339 rt->rt6i_flags |= RTF_MODIFIED;
1340 rt->rt6i_pmtu = mtu;
1341 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1342 }
1343
1344 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1345 {
1346 return !(rt->rt6i_flags & RTF_CACHE) &&
1347 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1348 }
1349
1350 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1351 const struct ipv6hdr *iph, u32 mtu)
1352 {
1353 struct rt6_info *rt6 = (struct rt6_info *)dst;
1354
1355 if (rt6->rt6i_flags & RTF_LOCAL)
1356 return;
1357
1358 dst_confirm(dst);
1359 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1360 if (mtu >= dst_mtu(dst))
1361 return;
1362
1363 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1364 rt6_do_update_pmtu(rt6, mtu);
1365 } else {
1366 const struct in6_addr *daddr, *saddr;
1367 struct rt6_info *nrt6;
1368
1369 if (iph) {
1370 daddr = &iph->daddr;
1371 saddr = &iph->saddr;
1372 } else if (sk) {
1373 daddr = &sk->sk_v6_daddr;
1374 saddr = &inet6_sk(sk)->saddr;
1375 } else {
1376 return;
1377 }
1378 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1379 if (nrt6) {
1380 rt6_do_update_pmtu(nrt6, mtu);
1381
1382 /* ip6_ins_rt(nrt6) will bump the
1383 * rt6->rt6i_node->fn_sernum
1384 * which will fail the next rt6_check() and
1385 * invalidate the sk->sk_dst_cache.
1386 */
1387 ip6_ins_rt(nrt6);
1388 }
1389 }
1390 }
1391
1392 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1393 struct sk_buff *skb, u32 mtu)
1394 {
1395 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1396 }
1397
1398 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1399 int oif, u32 mark)
1400 {
1401 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1402 struct dst_entry *dst;
1403 struct flowi6 fl6;
1404
1405 memset(&fl6, 0, sizeof(fl6));
1406 fl6.flowi6_oif = oif;
1407 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1408 fl6.daddr = iph->daddr;
1409 fl6.saddr = iph->saddr;
1410 fl6.flowlabel = ip6_flowinfo(iph);
1411
1412 dst = ip6_route_output(net, NULL, &fl6);
1413 if (!dst->error)
1414 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1415 dst_release(dst);
1416 }
1417 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1418
1419 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1420 {
1421 struct dst_entry *dst;
1422
1423 ip6_update_pmtu(skb, sock_net(sk), mtu,
1424 sk->sk_bound_dev_if, sk->sk_mark);
1425
1426 dst = __sk_dst_get(sk);
1427 if (!dst || !dst->obsolete ||
1428 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1429 return;
1430
1431 bh_lock_sock(sk);
1432 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1433 ip6_datagram_dst_update(sk, false);
1434 bh_unlock_sock(sk);
1435 }
1436 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1437
1438 /* Handle redirects */
1439 struct ip6rd_flowi {
1440 struct flowi6 fl6;
1441 struct in6_addr gateway;
1442 };
1443
1444 static struct rt6_info *__ip6_route_redirect(struct net *net,
1445 struct fib6_table *table,
1446 struct flowi6 *fl6,
1447 int flags)
1448 {
1449 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1450 struct rt6_info *rt;
1451 struct fib6_node *fn;
1452
1453 /* Get the "current" route for this destination and
1454 * check if the redirect has come from approriate router.
1455 *
1456 * RFC 4861 specifies that redirects should only be
1457 * accepted if they come from the nexthop to the target.
1458 * Due to the way the routes are chosen, this notion
1459 * is a bit fuzzy and one might need to check all possible
1460 * routes.
1461 */
1462
1463 read_lock_bh(&table->tb6_lock);
1464 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1465 restart:
1466 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1467 if (rt6_check_expired(rt))
1468 continue;
1469 if (rt->dst.error)
1470 break;
1471 if (!(rt->rt6i_flags & RTF_GATEWAY))
1472 continue;
1473 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1474 continue;
1475 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1476 continue;
1477 break;
1478 }
1479
1480 if (!rt)
1481 rt = net->ipv6.ip6_null_entry;
1482 else if (rt->dst.error) {
1483 rt = net->ipv6.ip6_null_entry;
1484 goto out;
1485 }
1486
1487 if (rt == net->ipv6.ip6_null_entry) {
1488 fn = fib6_backtrack(fn, &fl6->saddr);
1489 if (fn)
1490 goto restart;
1491 }
1492
1493 out:
1494 dst_hold(&rt->dst);
1495
1496 read_unlock_bh(&table->tb6_lock);
1497
1498 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1499 return rt;
1500 };
1501
1502 static struct dst_entry *ip6_route_redirect(struct net *net,
1503 const struct flowi6 *fl6,
1504 const struct in6_addr *gateway)
1505 {
1506 int flags = RT6_LOOKUP_F_HAS_SADDR;
1507 struct ip6rd_flowi rdfl;
1508
1509 rdfl.fl6 = *fl6;
1510 rdfl.gateway = *gateway;
1511
1512 return fib6_rule_lookup(net, &rdfl.fl6,
1513 flags, __ip6_route_redirect);
1514 }
1515
1516 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1517 {
1518 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1519 struct dst_entry *dst;
1520 struct flowi6 fl6;
1521
1522 memset(&fl6, 0, sizeof(fl6));
1523 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1524 fl6.flowi6_oif = oif;
1525 fl6.flowi6_mark = mark;
1526 fl6.daddr = iph->daddr;
1527 fl6.saddr = iph->saddr;
1528 fl6.flowlabel = ip6_flowinfo(iph);
1529
1530 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1531 rt6_do_redirect(dst, NULL, skb);
1532 dst_release(dst);
1533 }
1534 EXPORT_SYMBOL_GPL(ip6_redirect);
1535
1536 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1537 u32 mark)
1538 {
1539 const struct ipv6hdr *iph = ipv6_hdr(skb);
1540 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1541 struct dst_entry *dst;
1542 struct flowi6 fl6;
1543
1544 memset(&fl6, 0, sizeof(fl6));
1545 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1546 fl6.flowi6_oif = oif;
1547 fl6.flowi6_mark = mark;
1548 fl6.daddr = msg->dest;
1549 fl6.saddr = iph->daddr;
1550
1551 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1552 rt6_do_redirect(dst, NULL, skb);
1553 dst_release(dst);
1554 }
1555
1556 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1557 {
1558 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1559 }
1560 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1561
1562 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1563 {
1564 struct net_device *dev = dst->dev;
1565 unsigned int mtu = dst_mtu(dst);
1566 struct net *net = dev_net(dev);
1567
1568 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1569
1570 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1571 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1572
1573 /*
1574 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1575 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1576 * IPV6_MAXPLEN is also valid and means: "any MSS,
1577 * rely only on pmtu discovery"
1578 */
1579 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1580 mtu = IPV6_MAXPLEN;
1581 return mtu;
1582 }
1583
1584 static unsigned int ip6_mtu(const struct dst_entry *dst)
1585 {
1586 const struct rt6_info *rt = (const struct rt6_info *)dst;
1587 unsigned int mtu = rt->rt6i_pmtu;
1588 struct inet6_dev *idev;
1589
1590 if (mtu)
1591 goto out;
1592
1593 mtu = dst_metric_raw(dst, RTAX_MTU);
1594 if (mtu)
1595 goto out;
1596
1597 mtu = IPV6_MIN_MTU;
1598
1599 rcu_read_lock();
1600 idev = __in6_dev_get(dst->dev);
1601 if (idev)
1602 mtu = idev->cnf.mtu6;
1603 rcu_read_unlock();
1604
1605 out:
1606 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1607 }
1608
1609 static struct dst_entry *icmp6_dst_gc_list;
1610 static DEFINE_SPINLOCK(icmp6_dst_lock);
1611
1612 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1613 struct flowi6 *fl6)
1614 {
1615 struct dst_entry *dst;
1616 struct rt6_info *rt;
1617 struct inet6_dev *idev = in6_dev_get(dev);
1618 struct net *net = dev_net(dev);
1619
1620 if (unlikely(!idev))
1621 return ERR_PTR(-ENODEV);
1622
1623 rt = ip6_dst_alloc(net, dev, 0);
1624 if (unlikely(!rt)) {
1625 in6_dev_put(idev);
1626 dst = ERR_PTR(-ENOMEM);
1627 goto out;
1628 }
1629
1630 rt->dst.flags |= DST_HOST;
1631 rt->dst.output = ip6_output;
1632 atomic_set(&rt->dst.__refcnt, 1);
1633 rt->rt6i_gateway = fl6->daddr;
1634 rt->rt6i_dst.addr = fl6->daddr;
1635 rt->rt6i_dst.plen = 128;
1636 rt->rt6i_idev = idev;
1637 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1638
1639 spin_lock_bh(&icmp6_dst_lock);
1640 rt->dst.next = icmp6_dst_gc_list;
1641 icmp6_dst_gc_list = &rt->dst;
1642 spin_unlock_bh(&icmp6_dst_lock);
1643
1644 fib6_force_start_gc(net);
1645
1646 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1647
1648 out:
1649 return dst;
1650 }
1651
1652 int icmp6_dst_gc(void)
1653 {
1654 struct dst_entry *dst, **pprev;
1655 int more = 0;
1656
1657 spin_lock_bh(&icmp6_dst_lock);
1658 pprev = &icmp6_dst_gc_list;
1659
1660 while ((dst = *pprev) != NULL) {
1661 if (!atomic_read(&dst->__refcnt)) {
1662 *pprev = dst->next;
1663 dst_free(dst);
1664 } else {
1665 pprev = &dst->next;
1666 ++more;
1667 }
1668 }
1669
1670 spin_unlock_bh(&icmp6_dst_lock);
1671
1672 return more;
1673 }
1674
1675 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1676 void *arg)
1677 {
1678 struct dst_entry *dst, **pprev;
1679
1680 spin_lock_bh(&icmp6_dst_lock);
1681 pprev = &icmp6_dst_gc_list;
1682 while ((dst = *pprev) != NULL) {
1683 struct rt6_info *rt = (struct rt6_info *) dst;
1684 if (func(rt, arg)) {
1685 *pprev = dst->next;
1686 dst_free(dst);
1687 } else {
1688 pprev = &dst->next;
1689 }
1690 }
1691 spin_unlock_bh(&icmp6_dst_lock);
1692 }
1693
1694 static int ip6_dst_gc(struct dst_ops *ops)
1695 {
1696 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1697 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1698 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1699 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1700 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1701 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1702 int entries;
1703
1704 entries = dst_entries_get_fast(ops);
1705 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1706 entries <= rt_max_size)
1707 goto out;
1708
1709 net->ipv6.ip6_rt_gc_expire++;
1710 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1711 entries = dst_entries_get_slow(ops);
1712 if (entries < ops->gc_thresh)
1713 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1714 out:
1715 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1716 return entries > rt_max_size;
1717 }
1718
1719 static int ip6_convert_metrics(struct mx6_config *mxc,
1720 const struct fib6_config *cfg)
1721 {
1722 bool ecn_ca = false;
1723 struct nlattr *nla;
1724 int remaining;
1725 u32 *mp;
1726
1727 if (!cfg->fc_mx)
1728 return 0;
1729
1730 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1731 if (unlikely(!mp))
1732 return -ENOMEM;
1733
1734 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1735 int type = nla_type(nla);
1736 u32 val;
1737
1738 if (!type)
1739 continue;
1740 if (unlikely(type > RTAX_MAX))
1741 goto err;
1742
1743 if (type == RTAX_CC_ALGO) {
1744 char tmp[TCP_CA_NAME_MAX];
1745
1746 nla_strlcpy(tmp, nla, sizeof(tmp));
1747 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1748 if (val == TCP_CA_UNSPEC)
1749 goto err;
1750 } else {
1751 val = nla_get_u32(nla);
1752 }
1753 if (type == RTAX_HOPLIMIT && val > 255)
1754 val = 255;
1755 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1756 goto err;
1757
1758 mp[type - 1] = val;
1759 __set_bit(type - 1, mxc->mx_valid);
1760 }
1761
1762 if (ecn_ca) {
1763 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1764 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1765 }
1766
1767 mxc->mx = mp;
1768 return 0;
1769 err:
1770 kfree(mp);
1771 return -EINVAL;
1772 }
1773
1774 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1775 struct fib6_config *cfg,
1776 const struct in6_addr *gw_addr)
1777 {
1778 struct flowi6 fl6 = {
1779 .flowi6_oif = cfg->fc_ifindex,
1780 .daddr = *gw_addr,
1781 .saddr = cfg->fc_prefsrc,
1782 };
1783 struct fib6_table *table;
1784 struct rt6_info *rt;
1785 int flags = 0;
1786
1787 table = fib6_get_table(net, cfg->fc_table);
1788 if (!table)
1789 return NULL;
1790
1791 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1792 flags |= RT6_LOOKUP_F_HAS_SADDR;
1793
1794 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1795
1796 /* if table lookup failed, fall back to full lookup */
1797 if (rt == net->ipv6.ip6_null_entry) {
1798 ip6_rt_put(rt);
1799 rt = NULL;
1800 }
1801
1802 return rt;
1803 }
1804
1805 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1806 {
1807 struct net *net = cfg->fc_nlinfo.nl_net;
1808 struct rt6_info *rt = NULL;
1809 struct net_device *dev = NULL;
1810 struct inet6_dev *idev = NULL;
1811 struct fib6_table *table;
1812 int addr_type;
1813 int err = -EINVAL;
1814
1815 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1816 goto out;
1817 #ifndef CONFIG_IPV6_SUBTREES
1818 if (cfg->fc_src_len)
1819 goto out;
1820 #endif
1821 if (cfg->fc_ifindex) {
1822 err = -ENODEV;
1823 dev = dev_get_by_index(net, cfg->fc_ifindex);
1824 if (!dev)
1825 goto out;
1826 idev = in6_dev_get(dev);
1827 if (!idev)
1828 goto out;
1829 }
1830
1831 if (cfg->fc_metric == 0)
1832 cfg->fc_metric = IP6_RT_PRIO_USER;
1833
1834 err = -ENOBUFS;
1835 if (cfg->fc_nlinfo.nlh &&
1836 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1837 table = fib6_get_table(net, cfg->fc_table);
1838 if (!table) {
1839 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1840 table = fib6_new_table(net, cfg->fc_table);
1841 }
1842 } else {
1843 table = fib6_new_table(net, cfg->fc_table);
1844 }
1845
1846 if (!table)
1847 goto out;
1848
1849 rt = ip6_dst_alloc(net, NULL,
1850 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1851
1852 if (!rt) {
1853 err = -ENOMEM;
1854 goto out;
1855 }
1856
1857 if (cfg->fc_flags & RTF_EXPIRES)
1858 rt6_set_expires(rt, jiffies +
1859 clock_t_to_jiffies(cfg->fc_expires));
1860 else
1861 rt6_clean_expires(rt);
1862
1863 if (cfg->fc_protocol == RTPROT_UNSPEC)
1864 cfg->fc_protocol = RTPROT_BOOT;
1865 rt->rt6i_protocol = cfg->fc_protocol;
1866
1867 addr_type = ipv6_addr_type(&cfg->fc_dst);
1868
1869 if (addr_type & IPV6_ADDR_MULTICAST)
1870 rt->dst.input = ip6_mc_input;
1871 else if (cfg->fc_flags & RTF_LOCAL)
1872 rt->dst.input = ip6_input;
1873 else
1874 rt->dst.input = ip6_forward;
1875
1876 rt->dst.output = ip6_output;
1877
1878 if (cfg->fc_encap) {
1879 struct lwtunnel_state *lwtstate;
1880
1881 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1882 cfg->fc_encap, AF_INET6, cfg,
1883 &lwtstate);
1884 if (err)
1885 goto out;
1886 rt->dst.lwtstate = lwtstate_get(lwtstate);
1887 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1888 rt->dst.lwtstate->orig_output = rt->dst.output;
1889 rt->dst.output = lwtunnel_output;
1890 }
1891 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1892 rt->dst.lwtstate->orig_input = rt->dst.input;
1893 rt->dst.input = lwtunnel_input;
1894 }
1895 }
1896
1897 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1898 rt->rt6i_dst.plen = cfg->fc_dst_len;
1899 if (rt->rt6i_dst.plen == 128)
1900 rt->dst.flags |= DST_HOST;
1901
1902 #ifdef CONFIG_IPV6_SUBTREES
1903 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1904 rt->rt6i_src.plen = cfg->fc_src_len;
1905 #endif
1906
1907 rt->rt6i_metric = cfg->fc_metric;
1908
1909 /* We cannot add true routes via loopback here,
1910 they would result in kernel looping; promote them to reject routes
1911 */
1912 if ((cfg->fc_flags & RTF_REJECT) ||
1913 (dev && (dev->flags & IFF_LOOPBACK) &&
1914 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1915 !(cfg->fc_flags & RTF_LOCAL))) {
1916 /* hold loopback dev/idev if we haven't done so. */
1917 if (dev != net->loopback_dev) {
1918 if (dev) {
1919 dev_put(dev);
1920 in6_dev_put(idev);
1921 }
1922 dev = net->loopback_dev;
1923 dev_hold(dev);
1924 idev = in6_dev_get(dev);
1925 if (!idev) {
1926 err = -ENODEV;
1927 goto out;
1928 }
1929 }
1930 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1931 switch (cfg->fc_type) {
1932 case RTN_BLACKHOLE:
1933 rt->dst.error = -EINVAL;
1934 rt->dst.output = dst_discard_out;
1935 rt->dst.input = dst_discard;
1936 break;
1937 case RTN_PROHIBIT:
1938 rt->dst.error = -EACCES;
1939 rt->dst.output = ip6_pkt_prohibit_out;
1940 rt->dst.input = ip6_pkt_prohibit;
1941 break;
1942 case RTN_THROW:
1943 case RTN_UNREACHABLE:
1944 default:
1945 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1946 : (cfg->fc_type == RTN_UNREACHABLE)
1947 ? -EHOSTUNREACH : -ENETUNREACH;
1948 rt->dst.output = ip6_pkt_discard_out;
1949 rt->dst.input = ip6_pkt_discard;
1950 break;
1951 }
1952 goto install_route;
1953 }
1954
1955 if (cfg->fc_flags & RTF_GATEWAY) {
1956 const struct in6_addr *gw_addr;
1957 int gwa_type;
1958
1959 gw_addr = &cfg->fc_gateway;
1960 gwa_type = ipv6_addr_type(gw_addr);
1961
1962 /* if gw_addr is local we will fail to detect this in case
1963 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1964 * will return already-added prefix route via interface that
1965 * prefix route was assigned to, which might be non-loopback.
1966 */
1967 err = -EINVAL;
1968 if (ipv6_chk_addr_and_flags(net, gw_addr,
1969 gwa_type & IPV6_ADDR_LINKLOCAL ?
1970 dev : NULL, 0, 0))
1971 goto out;
1972
1973 rt->rt6i_gateway = *gw_addr;
1974
1975 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1976 struct rt6_info *grt = NULL;
1977
1978 /* IPv6 strictly inhibits using not link-local
1979 addresses as nexthop address.
1980 Otherwise, router will not able to send redirects.
1981 It is very good, but in some (rare!) circumstances
1982 (SIT, PtP, NBMA NOARP links) it is handy to allow
1983 some exceptions. --ANK
1984 */
1985 if (!(gwa_type & IPV6_ADDR_UNICAST))
1986 goto out;
1987
1988 if (cfg->fc_table)
1989 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1990
1991 if (!grt)
1992 grt = rt6_lookup(net, gw_addr, NULL,
1993 cfg->fc_ifindex, 1);
1994
1995 err = -EHOSTUNREACH;
1996 if (!grt)
1997 goto out;
1998 if (dev) {
1999 if (dev != grt->dst.dev) {
2000 ip6_rt_put(grt);
2001 goto out;
2002 }
2003 } else {
2004 dev = grt->dst.dev;
2005 idev = grt->rt6i_idev;
2006 dev_hold(dev);
2007 in6_dev_hold(grt->rt6i_idev);
2008 }
2009 if (!(grt->rt6i_flags & RTF_GATEWAY))
2010 err = 0;
2011 ip6_rt_put(grt);
2012
2013 if (err)
2014 goto out;
2015 }
2016 err = -EINVAL;
2017 if (!dev || (dev->flags & IFF_LOOPBACK))
2018 goto out;
2019 }
2020
2021 err = -ENODEV;
2022 if (!dev)
2023 goto out;
2024
2025 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2026 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2027 err = -EINVAL;
2028 goto out;
2029 }
2030 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2031 rt->rt6i_prefsrc.plen = 128;
2032 } else
2033 rt->rt6i_prefsrc.plen = 0;
2034
2035 rt->rt6i_flags = cfg->fc_flags;
2036
2037 install_route:
2038 rt->dst.dev = dev;
2039 rt->rt6i_idev = idev;
2040 rt->rt6i_table = table;
2041
2042 cfg->fc_nlinfo.nl_net = dev_net(dev);
2043
2044 return rt;
2045 out:
2046 if (dev)
2047 dev_put(dev);
2048 if (idev)
2049 in6_dev_put(idev);
2050 if (rt)
2051 dst_free(&rt->dst);
2052
2053 return ERR_PTR(err);
2054 }
2055
2056 int ip6_route_add(struct fib6_config *cfg)
2057 {
2058 struct mx6_config mxc = { .mx = NULL, };
2059 struct rt6_info *rt;
2060 int err;
2061
2062 rt = ip6_route_info_create(cfg);
2063 if (IS_ERR(rt)) {
2064 err = PTR_ERR(rt);
2065 rt = NULL;
2066 goto out;
2067 }
2068
2069 err = ip6_convert_metrics(&mxc, cfg);
2070 if (err)
2071 goto out;
2072
2073 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2074
2075 kfree(mxc.mx);
2076
2077 return err;
2078 out:
2079 if (rt)
2080 dst_free(&rt->dst);
2081
2082 return err;
2083 }
2084
2085 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2086 {
2087 int err;
2088 struct fib6_table *table;
2089 struct net *net = dev_net(rt->dst.dev);
2090
2091 if (rt == net->ipv6.ip6_null_entry ||
2092 rt->dst.flags & DST_NOCACHE) {
2093 err = -ENOENT;
2094 goto out;
2095 }
2096
2097 table = rt->rt6i_table;
2098 write_lock_bh(&table->tb6_lock);
2099 err = fib6_del(rt, info);
2100 write_unlock_bh(&table->tb6_lock);
2101
2102 out:
2103 ip6_rt_put(rt);
2104 return err;
2105 }
2106
2107 int ip6_del_rt(struct rt6_info *rt)
2108 {
2109 struct nl_info info = {
2110 .nl_net = dev_net(rt->dst.dev),
2111 };
2112 return __ip6_del_rt(rt, &info);
2113 }
2114
2115 static int ip6_route_del(struct fib6_config *cfg)
2116 {
2117 struct fib6_table *table;
2118 struct fib6_node *fn;
2119 struct rt6_info *rt;
2120 int err = -ESRCH;
2121
2122 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2123 if (!table)
2124 return err;
2125
2126 read_lock_bh(&table->tb6_lock);
2127
2128 fn = fib6_locate(&table->tb6_root,
2129 &cfg->fc_dst, cfg->fc_dst_len,
2130 &cfg->fc_src, cfg->fc_src_len);
2131
2132 if (fn) {
2133 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2134 if ((rt->rt6i_flags & RTF_CACHE) &&
2135 !(cfg->fc_flags & RTF_CACHE))
2136 continue;
2137 if (cfg->fc_ifindex &&
2138 (!rt->dst.dev ||
2139 rt->dst.dev->ifindex != cfg->fc_ifindex))
2140 continue;
2141 if (cfg->fc_flags & RTF_GATEWAY &&
2142 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2143 continue;
2144 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2145 continue;
2146 dst_hold(&rt->dst);
2147 read_unlock_bh(&table->tb6_lock);
2148
2149 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2150 }
2151 }
2152 read_unlock_bh(&table->tb6_lock);
2153
2154 return err;
2155 }
2156
2157 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2158 {
2159 struct netevent_redirect netevent;
2160 struct rt6_info *rt, *nrt = NULL;
2161 struct ndisc_options ndopts;
2162 struct inet6_dev *in6_dev;
2163 struct neighbour *neigh;
2164 struct rd_msg *msg;
2165 int optlen, on_link;
2166 u8 *lladdr;
2167
2168 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2169 optlen -= sizeof(*msg);
2170
2171 if (optlen < 0) {
2172 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2173 return;
2174 }
2175
2176 msg = (struct rd_msg *)icmp6_hdr(skb);
2177
2178 if (ipv6_addr_is_multicast(&msg->dest)) {
2179 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2180 return;
2181 }
2182
2183 on_link = 0;
2184 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2185 on_link = 1;
2186 } else if (ipv6_addr_type(&msg->target) !=
2187 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2188 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2189 return;
2190 }
2191
2192 in6_dev = __in6_dev_get(skb->dev);
2193 if (!in6_dev)
2194 return;
2195 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2196 return;
2197
2198 /* RFC2461 8.1:
2199 * The IP source address of the Redirect MUST be the same as the current
2200 * first-hop router for the specified ICMP Destination Address.
2201 */
2202
2203 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2204 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2205 return;
2206 }
2207
2208 lladdr = NULL;
2209 if (ndopts.nd_opts_tgt_lladdr) {
2210 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2211 skb->dev);
2212 if (!lladdr) {
2213 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2214 return;
2215 }
2216 }
2217
2218 rt = (struct rt6_info *) dst;
2219 if (rt->rt6i_flags & RTF_REJECT) {
2220 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2221 return;
2222 }
2223
2224 /* Redirect received -> path was valid.
2225 * Look, redirects are sent only in response to data packets,
2226 * so that this nexthop apparently is reachable. --ANK
2227 */
2228 dst_confirm(&rt->dst);
2229
2230 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2231 if (!neigh)
2232 return;
2233
2234 /*
2235 * We have finally decided to accept it.
2236 */
2237
2238 neigh_update(neigh, lladdr, NUD_STALE,
2239 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2240 NEIGH_UPDATE_F_OVERRIDE|
2241 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2242 NEIGH_UPDATE_F_ISROUTER))
2243 );
2244
2245 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2246 if (!nrt)
2247 goto out;
2248
2249 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2250 if (on_link)
2251 nrt->rt6i_flags &= ~RTF_GATEWAY;
2252
2253 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2254
2255 if (ip6_ins_rt(nrt))
2256 goto out;
2257
2258 netevent.old = &rt->dst;
2259 netevent.new = &nrt->dst;
2260 netevent.daddr = &msg->dest;
2261 netevent.neigh = neigh;
2262 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2263
2264 if (rt->rt6i_flags & RTF_CACHE) {
2265 rt = (struct rt6_info *) dst_clone(&rt->dst);
2266 ip6_del_rt(rt);
2267 }
2268
2269 out:
2270 neigh_release(neigh);
2271 }
2272
2273 /*
2274 * Misc support functions
2275 */
2276
2277 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2278 {
2279 BUG_ON(from->dst.from);
2280
2281 rt->rt6i_flags &= ~RTF_EXPIRES;
2282 dst_hold(&from->dst);
2283 rt->dst.from = &from->dst;
2284 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2285 }
2286
2287 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2288 {
2289 rt->dst.input = ort->dst.input;
2290 rt->dst.output = ort->dst.output;
2291 rt->rt6i_dst = ort->rt6i_dst;
2292 rt->dst.error = ort->dst.error;
2293 rt->rt6i_idev = ort->rt6i_idev;
2294 if (rt->rt6i_idev)
2295 in6_dev_hold(rt->rt6i_idev);
2296 rt->dst.lastuse = jiffies;
2297 rt->rt6i_gateway = ort->rt6i_gateway;
2298 rt->rt6i_flags = ort->rt6i_flags;
2299 rt6_set_from(rt, ort);
2300 rt->rt6i_metric = ort->rt6i_metric;
2301 #ifdef CONFIG_IPV6_SUBTREES
2302 rt->rt6i_src = ort->rt6i_src;
2303 #endif
2304 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2305 rt->rt6i_table = ort->rt6i_table;
2306 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2307 }
2308
2309 #ifdef CONFIG_IPV6_ROUTE_INFO
2310 static struct rt6_info *rt6_get_route_info(struct net *net,
2311 const struct in6_addr *prefix, int prefixlen,
2312 const struct in6_addr *gwaddr, int ifindex)
2313 {
2314 struct fib6_node *fn;
2315 struct rt6_info *rt = NULL;
2316 struct fib6_table *table;
2317
2318 table = fib6_get_table(net, RT6_TABLE_INFO);
2319 if (!table)
2320 return NULL;
2321
2322 read_lock_bh(&table->tb6_lock);
2323 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2324 if (!fn)
2325 goto out;
2326
2327 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2328 if (rt->dst.dev->ifindex != ifindex)
2329 continue;
2330 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2331 continue;
2332 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2333 continue;
2334 dst_hold(&rt->dst);
2335 break;
2336 }
2337 out:
2338 read_unlock_bh(&table->tb6_lock);
2339 return rt;
2340 }
2341
2342 static struct rt6_info *rt6_add_route_info(struct net *net,
2343 const struct in6_addr *prefix, int prefixlen,
2344 const struct in6_addr *gwaddr, int ifindex,
2345 unsigned int pref)
2346 {
2347 struct fib6_config cfg = {
2348 .fc_metric = IP6_RT_PRIO_USER,
2349 .fc_ifindex = ifindex,
2350 .fc_dst_len = prefixlen,
2351 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2352 RTF_UP | RTF_PREF(pref),
2353 .fc_nlinfo.portid = 0,
2354 .fc_nlinfo.nlh = NULL,
2355 .fc_nlinfo.nl_net = net,
2356 };
2357
2358 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
2359 cfg.fc_dst = *prefix;
2360 cfg.fc_gateway = *gwaddr;
2361
2362 /* We should treat it as a default route if prefix length is 0. */
2363 if (!prefixlen)
2364 cfg.fc_flags |= RTF_DEFAULT;
2365
2366 ip6_route_add(&cfg);
2367
2368 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2369 }
2370 #endif
2371
2372 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2373 {
2374 struct rt6_info *rt;
2375 struct fib6_table *table;
2376
2377 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2378 if (!table)
2379 return NULL;
2380
2381 read_lock_bh(&table->tb6_lock);
2382 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2383 if (dev == rt->dst.dev &&
2384 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2385 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2386 break;
2387 }
2388 if (rt)
2389 dst_hold(&rt->dst);
2390 read_unlock_bh(&table->tb6_lock);
2391 return rt;
2392 }
2393
2394 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2395 struct net_device *dev,
2396 unsigned int pref)
2397 {
2398 struct fib6_config cfg = {
2399 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2400 .fc_metric = IP6_RT_PRIO_USER,
2401 .fc_ifindex = dev->ifindex,
2402 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2403 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2404 .fc_nlinfo.portid = 0,
2405 .fc_nlinfo.nlh = NULL,
2406 .fc_nlinfo.nl_net = dev_net(dev),
2407 };
2408
2409 cfg.fc_gateway = *gwaddr;
2410
2411 ip6_route_add(&cfg);
2412
2413 return rt6_get_dflt_router(gwaddr, dev);
2414 }
2415
2416 void rt6_purge_dflt_routers(struct net *net)
2417 {
2418 struct rt6_info *rt;
2419 struct fib6_table *table;
2420
2421 /* NOTE: Keep consistent with rt6_get_dflt_router */
2422 table = fib6_get_table(net, RT6_TABLE_DFLT);
2423 if (!table)
2424 return;
2425
2426 restart:
2427 read_lock_bh(&table->tb6_lock);
2428 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2429 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2430 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2431 dst_hold(&rt->dst);
2432 read_unlock_bh(&table->tb6_lock);
2433 ip6_del_rt(rt);
2434 goto restart;
2435 }
2436 }
2437 read_unlock_bh(&table->tb6_lock);
2438 }
2439
2440 static void rtmsg_to_fib6_config(struct net *net,
2441 struct in6_rtmsg *rtmsg,
2442 struct fib6_config *cfg)
2443 {
2444 memset(cfg, 0, sizeof(*cfg));
2445
2446 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2447 : RT6_TABLE_MAIN;
2448 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2449 cfg->fc_metric = rtmsg->rtmsg_metric;
2450 cfg->fc_expires = rtmsg->rtmsg_info;
2451 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2452 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2453 cfg->fc_flags = rtmsg->rtmsg_flags;
2454
2455 cfg->fc_nlinfo.nl_net = net;
2456
2457 cfg->fc_dst = rtmsg->rtmsg_dst;
2458 cfg->fc_src = rtmsg->rtmsg_src;
2459 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2460 }
2461
2462 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2463 {
2464 struct fib6_config cfg;
2465 struct in6_rtmsg rtmsg;
2466 int err;
2467
2468 switch (cmd) {
2469 case SIOCADDRT: /* Add a route */
2470 case SIOCDELRT: /* Delete a route */
2471 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2472 return -EPERM;
2473 err = copy_from_user(&rtmsg, arg,
2474 sizeof(struct in6_rtmsg));
2475 if (err)
2476 return -EFAULT;
2477
2478 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2479
2480 rtnl_lock();
2481 switch (cmd) {
2482 case SIOCADDRT:
2483 err = ip6_route_add(&cfg);
2484 break;
2485 case SIOCDELRT:
2486 err = ip6_route_del(&cfg);
2487 break;
2488 default:
2489 err = -EINVAL;
2490 }
2491 rtnl_unlock();
2492
2493 return err;
2494 }
2495
2496 return -EINVAL;
2497 }
2498
2499 /*
2500 * Drop the packet on the floor
2501 */
2502
2503 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2504 {
2505 int type;
2506 struct dst_entry *dst = skb_dst(skb);
2507 switch (ipstats_mib_noroutes) {
2508 case IPSTATS_MIB_INNOROUTES:
2509 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2510 if (type == IPV6_ADDR_ANY) {
2511 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2512 IPSTATS_MIB_INADDRERRORS);
2513 break;
2514 }
2515 /* FALLTHROUGH */
2516 case IPSTATS_MIB_OUTNOROUTES:
2517 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2518 ipstats_mib_noroutes);
2519 break;
2520 }
2521 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2522 kfree_skb(skb);
2523 return 0;
2524 }
2525
2526 static int ip6_pkt_discard(struct sk_buff *skb)
2527 {
2528 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2529 }
2530
2531 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2532 {
2533 skb->dev = skb_dst(skb)->dev;
2534 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2535 }
2536
2537 static int ip6_pkt_prohibit(struct sk_buff *skb)
2538 {
2539 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2540 }
2541
2542 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2543 {
2544 skb->dev = skb_dst(skb)->dev;
2545 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2546 }
2547
2548 /*
2549 * Allocate a dst for local (unicast / anycast) address.
2550 */
2551
2552 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2553 const struct in6_addr *addr,
2554 bool anycast)
2555 {
2556 u32 tb_id;
2557 struct net *net = dev_net(idev->dev);
2558 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2559 DST_NOCOUNT);
2560 if (!rt)
2561 return ERR_PTR(-ENOMEM);
2562
2563 in6_dev_hold(idev);
2564
2565 rt->dst.flags |= DST_HOST;
2566 rt->dst.input = ip6_input;
2567 rt->dst.output = ip6_output;
2568 rt->rt6i_idev = idev;
2569
2570 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2571 if (anycast)
2572 rt->rt6i_flags |= RTF_ANYCAST;
2573 else
2574 rt->rt6i_flags |= RTF_LOCAL;
2575
2576 rt->rt6i_gateway = *addr;
2577 rt->rt6i_dst.addr = *addr;
2578 rt->rt6i_dst.plen = 128;
2579 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2580 rt->rt6i_table = fib6_get_table(net, tb_id);
2581 rt->dst.flags |= DST_NOCACHE;
2582
2583 atomic_set(&rt->dst.__refcnt, 1);
2584
2585 return rt;
2586 }
2587
2588 int ip6_route_get_saddr(struct net *net,
2589 struct rt6_info *rt,
2590 const struct in6_addr *daddr,
2591 unsigned int prefs,
2592 struct in6_addr *saddr)
2593 {
2594 struct inet6_dev *idev =
2595 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2596 int err = 0;
2597 if (rt && rt->rt6i_prefsrc.plen)
2598 *saddr = rt->rt6i_prefsrc.addr;
2599 else
2600 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2601 daddr, prefs, saddr);
2602 return err;
2603 }
2604
2605 /* remove deleted ip from prefsrc entries */
2606 struct arg_dev_net_ip {
2607 struct net_device *dev;
2608 struct net *net;
2609 struct in6_addr *addr;
2610 };
2611
2612 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2613 {
2614 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2615 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2616 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2617
2618 if (((void *)rt->dst.dev == dev || !dev) &&
2619 rt != net->ipv6.ip6_null_entry &&
2620 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2621 /* remove prefsrc entry */
2622 rt->rt6i_prefsrc.plen = 0;
2623 }
2624 return 0;
2625 }
2626
2627 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2628 {
2629 struct net *net = dev_net(ifp->idev->dev);
2630 struct arg_dev_net_ip adni = {
2631 .dev = ifp->idev->dev,
2632 .net = net,
2633 .addr = &ifp->addr,
2634 };
2635 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2636 }
2637
2638 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2639 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2640
2641 /* Remove routers and update dst entries when gateway turn into host. */
2642 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2643 {
2644 struct in6_addr *gateway = (struct in6_addr *)arg;
2645
2646 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2647 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2648 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2649 return -1;
2650 }
2651 return 0;
2652 }
2653
2654 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2655 {
2656 fib6_clean_all(net, fib6_clean_tohost, gateway);
2657 }
2658
2659 struct arg_dev_net {
2660 struct net_device *dev;
2661 struct net *net;
2662 };
2663
2664 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2665 {
2666 const struct arg_dev_net *adn = arg;
2667 const struct net_device *dev = adn->dev;
2668
2669 if ((rt->dst.dev == dev || !dev) &&
2670 rt != adn->net->ipv6.ip6_null_entry)
2671 return -1;
2672
2673 return 0;
2674 }
2675
2676 void rt6_ifdown(struct net *net, struct net_device *dev)
2677 {
2678 struct arg_dev_net adn = {
2679 .dev = dev,
2680 .net = net,
2681 };
2682
2683 fib6_clean_all(net, fib6_ifdown, &adn);
2684 icmp6_clean_all(fib6_ifdown, &adn);
2685 if (dev)
2686 rt6_uncached_list_flush_dev(net, dev);
2687 }
2688
2689 struct rt6_mtu_change_arg {
2690 struct net_device *dev;
2691 unsigned int mtu;
2692 };
2693
2694 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2695 {
2696 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2697 struct inet6_dev *idev;
2698
2699 /* In IPv6 pmtu discovery is not optional,
2700 so that RTAX_MTU lock cannot disable it.
2701 We still use this lock to block changes
2702 caused by addrconf/ndisc.
2703 */
2704
2705 idev = __in6_dev_get(arg->dev);
2706 if (!idev)
2707 return 0;
2708
2709 /* For administrative MTU increase, there is no way to discover
2710 IPv6 PMTU increase, so PMTU increase should be updated here.
2711 Since RFC 1981 doesn't include administrative MTU increase
2712 update PMTU increase is a MUST. (i.e. jumbo frame)
2713 */
2714 /*
2715 If new MTU is less than route PMTU, this new MTU will be the
2716 lowest MTU in the path, update the route PMTU to reflect PMTU
2717 decreases; if new MTU is greater than route PMTU, and the
2718 old MTU is the lowest MTU in the path, update the route PMTU
2719 to reflect the increase. In this case if the other nodes' MTU
2720 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2721 PMTU discouvery.
2722 */
2723 if (rt->dst.dev == arg->dev &&
2724 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2725 if (rt->rt6i_flags & RTF_CACHE) {
2726 /* For RTF_CACHE with rt6i_pmtu == 0
2727 * (i.e. a redirected route),
2728 * the metrics of its rt->dst.from has already
2729 * been updated.
2730 */
2731 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2732 rt->rt6i_pmtu = arg->mtu;
2733 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2734 (dst_mtu(&rt->dst) < arg->mtu &&
2735 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2736 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2737 }
2738 }
2739 return 0;
2740 }
2741
2742 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2743 {
2744 struct rt6_mtu_change_arg arg = {
2745 .dev = dev,
2746 .mtu = mtu,
2747 };
2748
2749 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2750 }
2751
2752 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2753 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2754 [RTA_OIF] = { .type = NLA_U32 },
2755 [RTA_IIF] = { .type = NLA_U32 },
2756 [RTA_PRIORITY] = { .type = NLA_U32 },
2757 [RTA_METRICS] = { .type = NLA_NESTED },
2758 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2759 [RTA_PREF] = { .type = NLA_U8 },
2760 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2761 [RTA_ENCAP] = { .type = NLA_NESTED },
2762 [RTA_EXPIRES] = { .type = NLA_U32 },
2763 };
2764
2765 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2766 struct fib6_config *cfg)
2767 {
2768 struct rtmsg *rtm;
2769 struct nlattr *tb[RTA_MAX+1];
2770 unsigned int pref;
2771 int err;
2772
2773 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2774 if (err < 0)
2775 goto errout;
2776
2777 err = -EINVAL;
2778 rtm = nlmsg_data(nlh);
2779 memset(cfg, 0, sizeof(*cfg));
2780
2781 cfg->fc_table = rtm->rtm_table;
2782 cfg->fc_dst_len = rtm->rtm_dst_len;
2783 cfg->fc_src_len = rtm->rtm_src_len;
2784 cfg->fc_flags = RTF_UP;
2785 cfg->fc_protocol = rtm->rtm_protocol;
2786 cfg->fc_type = rtm->rtm_type;
2787
2788 if (rtm->rtm_type == RTN_UNREACHABLE ||
2789 rtm->rtm_type == RTN_BLACKHOLE ||
2790 rtm->rtm_type == RTN_PROHIBIT ||
2791 rtm->rtm_type == RTN_THROW)
2792 cfg->fc_flags |= RTF_REJECT;
2793
2794 if (rtm->rtm_type == RTN_LOCAL)
2795 cfg->fc_flags |= RTF_LOCAL;
2796
2797 if (rtm->rtm_flags & RTM_F_CLONED)
2798 cfg->fc_flags |= RTF_CACHE;
2799
2800 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2801 cfg->fc_nlinfo.nlh = nlh;
2802 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2803
2804 if (tb[RTA_GATEWAY]) {
2805 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2806 cfg->fc_flags |= RTF_GATEWAY;
2807 }
2808
2809 if (tb[RTA_DST]) {
2810 int plen = (rtm->rtm_dst_len + 7) >> 3;
2811
2812 if (nla_len(tb[RTA_DST]) < plen)
2813 goto errout;
2814
2815 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2816 }
2817
2818 if (tb[RTA_SRC]) {
2819 int plen = (rtm->rtm_src_len + 7) >> 3;
2820
2821 if (nla_len(tb[RTA_SRC]) < plen)
2822 goto errout;
2823
2824 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2825 }
2826
2827 if (tb[RTA_PREFSRC])
2828 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2829
2830 if (tb[RTA_OIF])
2831 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2832
2833 if (tb[RTA_PRIORITY])
2834 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2835
2836 if (tb[RTA_METRICS]) {
2837 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2838 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2839 }
2840
2841 if (tb[RTA_TABLE])
2842 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2843
2844 if (tb[RTA_MULTIPATH]) {
2845 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2846 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2847 }
2848
2849 if (tb[RTA_PREF]) {
2850 pref = nla_get_u8(tb[RTA_PREF]);
2851 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2852 pref != ICMPV6_ROUTER_PREF_HIGH)
2853 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2854 cfg->fc_flags |= RTF_PREF(pref);
2855 }
2856
2857 if (tb[RTA_ENCAP])
2858 cfg->fc_encap = tb[RTA_ENCAP];
2859
2860 if (tb[RTA_ENCAP_TYPE])
2861 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2862
2863 if (tb[RTA_EXPIRES]) {
2864 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2865
2866 if (addrconf_finite_timeout(timeout)) {
2867 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2868 cfg->fc_flags |= RTF_EXPIRES;
2869 }
2870 }
2871
2872 err = 0;
2873 errout:
2874 return err;
2875 }
2876
2877 struct rt6_nh {
2878 struct rt6_info *rt6_info;
2879 struct fib6_config r_cfg;
2880 struct mx6_config mxc;
2881 struct list_head next;
2882 };
2883
2884 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2885 {
2886 struct rt6_nh *nh;
2887
2888 list_for_each_entry(nh, rt6_nh_list, next) {
2889 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2890 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2891 nh->r_cfg.fc_ifindex);
2892 }
2893 }
2894
2895 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2896 struct rt6_info *rt, struct fib6_config *r_cfg)
2897 {
2898 struct rt6_nh *nh;
2899 struct rt6_info *rtnh;
2900 int err = -EEXIST;
2901
2902 list_for_each_entry(nh, rt6_nh_list, next) {
2903 /* check if rt6_info already exists */
2904 rtnh = nh->rt6_info;
2905
2906 if (rtnh->dst.dev == rt->dst.dev &&
2907 rtnh->rt6i_idev == rt->rt6i_idev &&
2908 ipv6_addr_equal(&rtnh->rt6i_gateway,
2909 &rt->rt6i_gateway))
2910 return err;
2911 }
2912
2913 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2914 if (!nh)
2915 return -ENOMEM;
2916 nh->rt6_info = rt;
2917 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2918 if (err) {
2919 kfree(nh);
2920 return err;
2921 }
2922 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2923 list_add_tail(&nh->next, rt6_nh_list);
2924
2925 return 0;
2926 }
2927
2928 static int ip6_route_multipath_add(struct fib6_config *cfg)
2929 {
2930 struct fib6_config r_cfg;
2931 struct rtnexthop *rtnh;
2932 struct rt6_info *rt;
2933 struct rt6_nh *err_nh;
2934 struct rt6_nh *nh, *nh_safe;
2935 int remaining;
2936 int attrlen;
2937 int err = 1;
2938 int nhn = 0;
2939 int replace = (cfg->fc_nlinfo.nlh &&
2940 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2941 LIST_HEAD(rt6_nh_list);
2942
2943 remaining = cfg->fc_mp_len;
2944 rtnh = (struct rtnexthop *)cfg->fc_mp;
2945
2946 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2947 * rt6_info structs per nexthop
2948 */
2949 while (rtnh_ok(rtnh, remaining)) {
2950 memcpy(&r_cfg, cfg, sizeof(*cfg));
2951 if (rtnh->rtnh_ifindex)
2952 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2953
2954 attrlen = rtnh_attrlen(rtnh);
2955 if (attrlen > 0) {
2956 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2957
2958 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2959 if (nla) {
2960 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2961 r_cfg.fc_flags |= RTF_GATEWAY;
2962 }
2963 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2964 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2965 if (nla)
2966 r_cfg.fc_encap_type = nla_get_u16(nla);
2967 }
2968
2969 rt = ip6_route_info_create(&r_cfg);
2970 if (IS_ERR(rt)) {
2971 err = PTR_ERR(rt);
2972 rt = NULL;
2973 goto cleanup;
2974 }
2975
2976 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2977 if (err) {
2978 dst_free(&rt->dst);
2979 goto cleanup;
2980 }
2981
2982 rtnh = rtnh_next(rtnh, &remaining);
2983 }
2984
2985 err_nh = NULL;
2986 list_for_each_entry(nh, &rt6_nh_list, next) {
2987 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2988 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2989 nh->rt6_info = NULL;
2990 if (err) {
2991 if (replace && nhn)
2992 ip6_print_replace_route_err(&rt6_nh_list);
2993 err_nh = nh;
2994 goto add_errout;
2995 }
2996
2997 /* Because each route is added like a single route we remove
2998 * these flags after the first nexthop: if there is a collision,
2999 * we have already failed to add the first nexthop:
3000 * fib6_add_rt2node() has rejected it; when replacing, old
3001 * nexthops have been replaced by first new, the rest should
3002 * be added to it.
3003 */
3004 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3005 NLM_F_REPLACE);
3006 nhn++;
3007 }
3008
3009 goto cleanup;
3010
3011 add_errout:
3012 /* Delete routes that were already added */
3013 list_for_each_entry(nh, &rt6_nh_list, next) {
3014 if (err_nh == nh)
3015 break;
3016 ip6_route_del(&nh->r_cfg);
3017 }
3018
3019 cleanup:
3020 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3021 if (nh->rt6_info)
3022 dst_free(&nh->rt6_info->dst);
3023 kfree(nh->mxc.mx);
3024 list_del(&nh->next);
3025 kfree(nh);
3026 }
3027
3028 return err;
3029 }
3030
3031 static int ip6_route_multipath_del(struct fib6_config *cfg)
3032 {
3033 struct fib6_config r_cfg;
3034 struct rtnexthop *rtnh;
3035 int remaining;
3036 int attrlen;
3037 int err = 1, last_err = 0;
3038
3039 remaining = cfg->fc_mp_len;
3040 rtnh = (struct rtnexthop *)cfg->fc_mp;
3041
3042 /* Parse a Multipath Entry */
3043 while (rtnh_ok(rtnh, remaining)) {
3044 memcpy(&r_cfg, cfg, sizeof(*cfg));
3045 if (rtnh->rtnh_ifindex)
3046 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3047
3048 attrlen = rtnh_attrlen(rtnh);
3049 if (attrlen > 0) {
3050 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3051
3052 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3053 if (nla) {
3054 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3055 r_cfg.fc_flags |= RTF_GATEWAY;
3056 }
3057 }
3058 err = ip6_route_del(&r_cfg);
3059 if (err)
3060 last_err = err;
3061
3062 rtnh = rtnh_next(rtnh, &remaining);
3063 }
3064
3065 return last_err;
3066 }
3067
3068 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3069 {
3070 struct fib6_config cfg;
3071 int err;
3072
3073 err = rtm_to_fib6_config(skb, nlh, &cfg);
3074 if (err < 0)
3075 return err;
3076
3077 if (cfg.fc_mp)
3078 return ip6_route_multipath_del(&cfg);
3079 else
3080 return ip6_route_del(&cfg);
3081 }
3082
3083 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3084 {
3085 struct fib6_config cfg;
3086 int err;
3087
3088 err = rtm_to_fib6_config(skb, nlh, &cfg);
3089 if (err < 0)
3090 return err;
3091
3092 if (cfg.fc_mp)
3093 return ip6_route_multipath_add(&cfg);
3094 else
3095 return ip6_route_add(&cfg);
3096 }
3097
3098 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3099 {
3100 return NLMSG_ALIGN(sizeof(struct rtmsg))
3101 + nla_total_size(16) /* RTA_SRC */
3102 + nla_total_size(16) /* RTA_DST */
3103 + nla_total_size(16) /* RTA_GATEWAY */
3104 + nla_total_size(16) /* RTA_PREFSRC */
3105 + nla_total_size(4) /* RTA_TABLE */
3106 + nla_total_size(4) /* RTA_IIF */
3107 + nla_total_size(4) /* RTA_OIF */
3108 + nla_total_size(4) /* RTA_PRIORITY */
3109 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3110 + nla_total_size(sizeof(struct rta_cacheinfo))
3111 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3112 + nla_total_size(1) /* RTA_PREF */
3113 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3114 }
3115
3116 static int rt6_fill_node(struct net *net,
3117 struct sk_buff *skb, struct rt6_info *rt,
3118 struct in6_addr *dst, struct in6_addr *src,
3119 int iif, int type, u32 portid, u32 seq,
3120 int prefix, int nowait, unsigned int flags)
3121 {
3122 u32 metrics[RTAX_MAX];
3123 struct rtmsg *rtm;
3124 struct nlmsghdr *nlh;
3125 long expires;
3126 u32 table;
3127
3128 if (prefix) { /* user wants prefix routes only */
3129 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3130 /* success since this is not a prefix route */
3131 return 1;
3132 }
3133 }
3134
3135 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3136 if (!nlh)
3137 return -EMSGSIZE;
3138
3139 rtm = nlmsg_data(nlh);
3140 rtm->rtm_family = AF_INET6;
3141 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3142 rtm->rtm_src_len = rt->rt6i_src.plen;
3143 rtm->rtm_tos = 0;
3144 if (rt->rt6i_table)
3145 table = rt->rt6i_table->tb6_id;
3146 else
3147 table = RT6_TABLE_UNSPEC;
3148 rtm->rtm_table = table;
3149 if (nla_put_u32(skb, RTA_TABLE, table))
3150 goto nla_put_failure;
3151 if (rt->rt6i_flags & RTF_REJECT) {
3152 switch (rt->dst.error) {
3153 case -EINVAL:
3154 rtm->rtm_type = RTN_BLACKHOLE;
3155 break;
3156 case -EACCES:
3157 rtm->rtm_type = RTN_PROHIBIT;
3158 break;
3159 case -EAGAIN:
3160 rtm->rtm_type = RTN_THROW;
3161 break;
3162 default:
3163 rtm->rtm_type = RTN_UNREACHABLE;
3164 break;
3165 }
3166 }
3167 else if (rt->rt6i_flags & RTF_LOCAL)
3168 rtm->rtm_type = RTN_LOCAL;
3169 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3170 rtm->rtm_type = RTN_LOCAL;
3171 else
3172 rtm->rtm_type = RTN_UNICAST;
3173 rtm->rtm_flags = 0;
3174 if (!netif_carrier_ok(rt->dst.dev)) {
3175 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3176 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3177 rtm->rtm_flags |= RTNH_F_DEAD;
3178 }
3179 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3180 rtm->rtm_protocol = rt->rt6i_protocol;
3181 if (rt->rt6i_flags & RTF_DYNAMIC)
3182 rtm->rtm_protocol = RTPROT_REDIRECT;
3183 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3184 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3185 rtm->rtm_protocol = RTPROT_RA;
3186 else
3187 rtm->rtm_protocol = RTPROT_KERNEL;
3188 }
3189
3190 if (rt->rt6i_flags & RTF_CACHE)
3191 rtm->rtm_flags |= RTM_F_CLONED;
3192
3193 if (dst) {
3194 if (nla_put_in6_addr(skb, RTA_DST, dst))
3195 goto nla_put_failure;
3196 rtm->rtm_dst_len = 128;
3197 } else if (rtm->rtm_dst_len)
3198 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3199 goto nla_put_failure;
3200 #ifdef CONFIG_IPV6_SUBTREES
3201 if (src) {
3202 if (nla_put_in6_addr(skb, RTA_SRC, src))
3203 goto nla_put_failure;
3204 rtm->rtm_src_len = 128;
3205 } else if (rtm->rtm_src_len &&
3206 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3207 goto nla_put_failure;
3208 #endif
3209 if (iif) {
3210 #ifdef CONFIG_IPV6_MROUTE
3211 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3212 int err = ip6mr_get_route(net, skb, rtm, nowait);
3213 if (err <= 0) {
3214 if (!nowait) {
3215 if (err == 0)
3216 return 0;
3217 goto nla_put_failure;
3218 } else {
3219 if (err == -EMSGSIZE)
3220 goto nla_put_failure;
3221 }
3222 }
3223 } else
3224 #endif
3225 if (nla_put_u32(skb, RTA_IIF, iif))
3226 goto nla_put_failure;
3227 } else if (dst) {
3228 struct in6_addr saddr_buf;
3229 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3230 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3231 goto nla_put_failure;
3232 }
3233
3234 if (rt->rt6i_prefsrc.plen) {
3235 struct in6_addr saddr_buf;
3236 saddr_buf = rt->rt6i_prefsrc.addr;
3237 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3238 goto nla_put_failure;
3239 }
3240
3241 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3242 if (rt->rt6i_pmtu)
3243 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3244 if (rtnetlink_put_metrics(skb, metrics) < 0)
3245 goto nla_put_failure;
3246
3247 if (rt->rt6i_flags & RTF_GATEWAY) {
3248 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3249 goto nla_put_failure;
3250 }
3251
3252 if (rt->dst.dev &&
3253 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3254 goto nla_put_failure;
3255 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3256 goto nla_put_failure;
3257
3258 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3259
3260 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3261 goto nla_put_failure;
3262
3263 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3264 goto nla_put_failure;
3265
3266 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3267
3268 nlmsg_end(skb, nlh);
3269 return 0;
3270
3271 nla_put_failure:
3272 nlmsg_cancel(skb, nlh);
3273 return -EMSGSIZE;
3274 }
3275
3276 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3277 {
3278 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3279 int prefix;
3280
3281 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3282 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3283 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3284 } else
3285 prefix = 0;
3286
3287 return rt6_fill_node(arg->net,
3288 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3289 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3290 prefix, 0, NLM_F_MULTI);
3291 }
3292
3293 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3294 {
3295 struct net *net = sock_net(in_skb->sk);
3296 struct nlattr *tb[RTA_MAX+1];
3297 struct rt6_info *rt;
3298 struct sk_buff *skb;
3299 struct rtmsg *rtm;
3300 struct flowi6 fl6;
3301 int err, iif = 0, oif = 0;
3302
3303 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3304 if (err < 0)
3305 goto errout;
3306
3307 err = -EINVAL;
3308 memset(&fl6, 0, sizeof(fl6));
3309
3310 if (tb[RTA_SRC]) {
3311 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3312 goto errout;
3313
3314 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3315 }
3316
3317 if (tb[RTA_DST]) {
3318 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3319 goto errout;
3320
3321 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3322 }
3323
3324 if (tb[RTA_IIF])
3325 iif = nla_get_u32(tb[RTA_IIF]);
3326
3327 if (tb[RTA_OIF])
3328 oif = nla_get_u32(tb[RTA_OIF]);
3329
3330 if (tb[RTA_MARK])
3331 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3332
3333 if (iif) {
3334 struct net_device *dev;
3335 int flags = 0;
3336
3337 dev = __dev_get_by_index(net, iif);
3338 if (!dev) {
3339 err = -ENODEV;
3340 goto errout;
3341 }
3342
3343 fl6.flowi6_iif = iif;
3344
3345 if (!ipv6_addr_any(&fl6.saddr))
3346 flags |= RT6_LOOKUP_F_HAS_SADDR;
3347
3348 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3349 flags);
3350 } else {
3351 fl6.flowi6_oif = oif;
3352
3353 if (netif_index_is_l3_master(net, oif)) {
3354 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3355 FLOWI_FLAG_SKIP_NH_OIF;
3356 }
3357
3358 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3359 }
3360
3361 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3362 if (!skb) {
3363 ip6_rt_put(rt);
3364 err = -ENOBUFS;
3365 goto errout;
3366 }
3367
3368 /* Reserve room for dummy headers, this skb can pass
3369 through good chunk of routing engine.
3370 */
3371 skb_reset_mac_header(skb);
3372 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3373
3374 skb_dst_set(skb, &rt->dst);
3375
3376 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3377 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3378 nlh->nlmsg_seq, 0, 0, 0);
3379 if (err < 0) {
3380 kfree_skb(skb);
3381 goto errout;
3382 }
3383
3384 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3385 errout:
3386 return err;
3387 }
3388
3389 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3390 unsigned int nlm_flags)
3391 {
3392 struct sk_buff *skb;
3393 struct net *net = info->nl_net;
3394 u32 seq;
3395 int err;
3396
3397 err = -ENOBUFS;
3398 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3399
3400 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3401 if (!skb)
3402 goto errout;
3403
3404 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3405 event, info->portid, seq, 0, 0, nlm_flags);
3406 if (err < 0) {
3407 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3408 WARN_ON(err == -EMSGSIZE);
3409 kfree_skb(skb);
3410 goto errout;
3411 }
3412 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3413 info->nlh, gfp_any());
3414 return;
3415 errout:
3416 if (err < 0)
3417 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3418 }
3419
3420 static int ip6_route_dev_notify(struct notifier_block *this,
3421 unsigned long event, void *ptr)
3422 {
3423 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3424 struct net *net = dev_net(dev);
3425
3426 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3427 net->ipv6.ip6_null_entry->dst.dev = dev;
3428 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3429 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3430 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3431 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3432 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3433 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3434 #endif
3435 }
3436
3437 return NOTIFY_OK;
3438 }
3439
3440 /*
3441 * /proc
3442 */
3443
3444 #ifdef CONFIG_PROC_FS
3445
3446 static const struct file_operations ipv6_route_proc_fops = {
3447 .owner = THIS_MODULE,
3448 .open = ipv6_route_open,
3449 .read = seq_read,
3450 .llseek = seq_lseek,
3451 .release = seq_release_net,
3452 };
3453
3454 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3455 {
3456 struct net *net = (struct net *)seq->private;
3457 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3458 net->ipv6.rt6_stats->fib_nodes,
3459 net->ipv6.rt6_stats->fib_route_nodes,
3460 net->ipv6.rt6_stats->fib_rt_alloc,
3461 net->ipv6.rt6_stats->fib_rt_entries,
3462 net->ipv6.rt6_stats->fib_rt_cache,
3463 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3464 net->ipv6.rt6_stats->fib_discarded_routes);
3465
3466 return 0;
3467 }
3468
3469 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3470 {
3471 return single_open_net(inode, file, rt6_stats_seq_show);
3472 }
3473
3474 static const struct file_operations rt6_stats_seq_fops = {
3475 .owner = THIS_MODULE,
3476 .open = rt6_stats_seq_open,
3477 .read = seq_read,
3478 .llseek = seq_lseek,
3479 .release = single_release_net,
3480 };
3481 #endif /* CONFIG_PROC_FS */
3482
3483 #ifdef CONFIG_SYSCTL
3484
3485 static
3486 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3487 void __user *buffer, size_t *lenp, loff_t *ppos)
3488 {
3489 struct net *net;
3490 int delay;
3491 if (!write)
3492 return -EINVAL;
3493
3494 net = (struct net *)ctl->extra1;
3495 delay = net->ipv6.sysctl.flush_delay;
3496 proc_dointvec(ctl, write, buffer, lenp, ppos);
3497 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3498 return 0;
3499 }
3500
3501 struct ctl_table ipv6_route_table_template[] = {
3502 {
3503 .procname = "flush",
3504 .data = &init_net.ipv6.sysctl.flush_delay,
3505 .maxlen = sizeof(int),
3506 .mode = 0200,
3507 .proc_handler = ipv6_sysctl_rtcache_flush
3508 },
3509 {
3510 .procname = "gc_thresh",
3511 .data = &ip6_dst_ops_template.gc_thresh,
3512 .maxlen = sizeof(int),
3513 .mode = 0644,
3514 .proc_handler = proc_dointvec,
3515 },
3516 {
3517 .procname = "max_size",
3518 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3519 .maxlen = sizeof(int),
3520 .mode = 0644,
3521 .proc_handler = proc_dointvec,
3522 },
3523 {
3524 .procname = "gc_min_interval",
3525 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3526 .maxlen = sizeof(int),
3527 .mode = 0644,
3528 .proc_handler = proc_dointvec_jiffies,
3529 },
3530 {
3531 .procname = "gc_timeout",
3532 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3533 .maxlen = sizeof(int),
3534 .mode = 0644,
3535 .proc_handler = proc_dointvec_jiffies,
3536 },
3537 {
3538 .procname = "gc_interval",
3539 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3540 .maxlen = sizeof(int),
3541 .mode = 0644,
3542 .proc_handler = proc_dointvec_jiffies,
3543 },
3544 {
3545 .procname = "gc_elasticity",
3546 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3547 .maxlen = sizeof(int),
3548 .mode = 0644,
3549 .proc_handler = proc_dointvec,
3550 },
3551 {
3552 .procname = "mtu_expires",
3553 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3554 .maxlen = sizeof(int),
3555 .mode = 0644,
3556 .proc_handler = proc_dointvec_jiffies,
3557 },
3558 {
3559 .procname = "min_adv_mss",
3560 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3561 .maxlen = sizeof(int),
3562 .mode = 0644,
3563 .proc_handler = proc_dointvec,
3564 },
3565 {
3566 .procname = "gc_min_interval_ms",
3567 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3568 .maxlen = sizeof(int),
3569 .mode = 0644,
3570 .proc_handler = proc_dointvec_ms_jiffies,
3571 },
3572 { }
3573 };
3574
3575 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3576 {
3577 struct ctl_table *table;
3578
3579 table = kmemdup(ipv6_route_table_template,
3580 sizeof(ipv6_route_table_template),
3581 GFP_KERNEL);
3582
3583 if (table) {
3584 table[0].data = &net->ipv6.sysctl.flush_delay;
3585 table[0].extra1 = net;
3586 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3587 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3588 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3589 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3590 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3591 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3592 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3593 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3594 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3595
3596 /* Don't export sysctls to unprivileged users */
3597 if (net->user_ns != &init_user_ns)
3598 table[0].procname = NULL;
3599 }
3600
3601 return table;
3602 }
3603 #endif
3604
3605 static int __net_init ip6_route_net_init(struct net *net)
3606 {
3607 int ret = -ENOMEM;
3608
3609 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3610 sizeof(net->ipv6.ip6_dst_ops));
3611
3612 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3613 goto out_ip6_dst_ops;
3614
3615 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3616 sizeof(*net->ipv6.ip6_null_entry),
3617 GFP_KERNEL);
3618 if (!net->ipv6.ip6_null_entry)
3619 goto out_ip6_dst_entries;
3620 net->ipv6.ip6_null_entry->dst.path =
3621 (struct dst_entry *)net->ipv6.ip6_null_entry;
3622 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3623 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3624 ip6_template_metrics, true);
3625
3626 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3627 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3628 sizeof(*net->ipv6.ip6_prohibit_entry),
3629 GFP_KERNEL);
3630 if (!net->ipv6.ip6_prohibit_entry)
3631 goto out_ip6_null_entry;
3632 net->ipv6.ip6_prohibit_entry->dst.path =
3633 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3634 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3635 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3636 ip6_template_metrics, true);
3637
3638 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3639 sizeof(*net->ipv6.ip6_blk_hole_entry),
3640 GFP_KERNEL);
3641 if (!net->ipv6.ip6_blk_hole_entry)
3642 goto out_ip6_prohibit_entry;
3643 net->ipv6.ip6_blk_hole_entry->dst.path =
3644 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3645 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3646 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3647 ip6_template_metrics, true);
3648 #endif
3649
3650 net->ipv6.sysctl.flush_delay = 0;
3651 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3652 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3653 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3654 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3655 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3656 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3657 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3658
3659 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3660
3661 ret = 0;
3662 out:
3663 return ret;
3664
3665 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3666 out_ip6_prohibit_entry:
3667 kfree(net->ipv6.ip6_prohibit_entry);
3668 out_ip6_null_entry:
3669 kfree(net->ipv6.ip6_null_entry);
3670 #endif
3671 out_ip6_dst_entries:
3672 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3673 out_ip6_dst_ops:
3674 goto out;
3675 }
3676
3677 static void __net_exit ip6_route_net_exit(struct net *net)
3678 {
3679 kfree(net->ipv6.ip6_null_entry);
3680 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3681 kfree(net->ipv6.ip6_prohibit_entry);
3682 kfree(net->ipv6.ip6_blk_hole_entry);
3683 #endif
3684 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3685 }
3686
3687 static int __net_init ip6_route_net_init_late(struct net *net)
3688 {
3689 #ifdef CONFIG_PROC_FS
3690 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3691 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3692 #endif
3693 return 0;
3694 }
3695
3696 static void __net_exit ip6_route_net_exit_late(struct net *net)
3697 {
3698 #ifdef CONFIG_PROC_FS
3699 remove_proc_entry("ipv6_route", net->proc_net);
3700 remove_proc_entry("rt6_stats", net->proc_net);
3701 #endif
3702 }
3703
3704 static struct pernet_operations ip6_route_net_ops = {
3705 .init = ip6_route_net_init,
3706 .exit = ip6_route_net_exit,
3707 };
3708
3709 static int __net_init ipv6_inetpeer_init(struct net *net)
3710 {
3711 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3712
3713 if (!bp)
3714 return -ENOMEM;
3715 inet_peer_base_init(bp);
3716 net->ipv6.peers = bp;
3717 return 0;
3718 }
3719
3720 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3721 {
3722 struct inet_peer_base *bp = net->ipv6.peers;
3723
3724 net->ipv6.peers = NULL;
3725 inetpeer_invalidate_tree(bp);
3726 kfree(bp);
3727 }
3728
3729 static struct pernet_operations ipv6_inetpeer_ops = {
3730 .init = ipv6_inetpeer_init,
3731 .exit = ipv6_inetpeer_exit,
3732 };
3733
3734 static struct pernet_operations ip6_route_net_late_ops = {
3735 .init = ip6_route_net_init_late,
3736 .exit = ip6_route_net_exit_late,
3737 };
3738
3739 static struct notifier_block ip6_route_dev_notifier = {
3740 .notifier_call = ip6_route_dev_notify,
3741 .priority = 0,
3742 };
3743
3744 int __init ip6_route_init(void)
3745 {
3746 int ret;
3747 int cpu;
3748
3749 ret = -ENOMEM;
3750 ip6_dst_ops_template.kmem_cachep =
3751 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3752 SLAB_HWCACHE_ALIGN, NULL);
3753 if (!ip6_dst_ops_template.kmem_cachep)
3754 goto out;
3755
3756 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3757 if (ret)
3758 goto out_kmem_cache;
3759
3760 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3761 if (ret)
3762 goto out_dst_entries;
3763
3764 ret = register_pernet_subsys(&ip6_route_net_ops);
3765 if (ret)
3766 goto out_register_inetpeer;
3767
3768 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3769
3770 /* Registering of the loopback is done before this portion of code,
3771 * the loopback reference in rt6_info will not be taken, do it
3772 * manually for init_net */
3773 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3774 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3775 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3776 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3777 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3778 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3779 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3780 #endif
3781 ret = fib6_init();
3782 if (ret)
3783 goto out_register_subsys;
3784
3785 ret = xfrm6_init();
3786 if (ret)
3787 goto out_fib6_init;
3788
3789 ret = fib6_rules_init();
3790 if (ret)
3791 goto xfrm6_init;
3792
3793 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3794 if (ret)
3795 goto fib6_rules_init;
3796
3797 ret = -ENOBUFS;
3798 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3799 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3800 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3801 goto out_register_late_subsys;
3802
3803 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3804 if (ret)
3805 goto out_register_late_subsys;
3806
3807 for_each_possible_cpu(cpu) {
3808 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3809
3810 INIT_LIST_HEAD(&ul->head);
3811 spin_lock_init(&ul->lock);
3812 }
3813
3814 out:
3815 return ret;
3816
3817 out_register_late_subsys:
3818 unregister_pernet_subsys(&ip6_route_net_late_ops);
3819 fib6_rules_init:
3820 fib6_rules_cleanup();
3821 xfrm6_init:
3822 xfrm6_fini();
3823 out_fib6_init:
3824 fib6_gc_cleanup();
3825 out_register_subsys:
3826 unregister_pernet_subsys(&ip6_route_net_ops);
3827 out_register_inetpeer:
3828 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3829 out_dst_entries:
3830 dst_entries_destroy(&ip6_dst_blackhole_ops);
3831 out_kmem_cache:
3832 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3833 goto out;
3834 }
3835
3836 void ip6_route_cleanup(void)
3837 {
3838 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3839 unregister_pernet_subsys(&ip6_route_net_late_ops);
3840 fib6_rules_cleanup();
3841 xfrm6_fini();
3842 fib6_gc_cleanup();
3843 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3844 unregister_pernet_subsys(&ip6_route_net_ops);
3845 dst_entries_destroy(&ip6_dst_blackhole_ops);
3846 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3847 }
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