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arm: KVM: Preserve pending Virtual Abort in world switch
[linux-2.6/btrfs-unstable.git] / net / ipv6 / route.c
blob49817555449e2956fcfe81555e646b5f9b53261a
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 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1046 int oif, 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 EXPORT_SYMBOL_GPL(ip6_pol_route);
1143
1144 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1145 struct flowi6 *fl6, int flags)
1146 {
1147 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1148 }
1149
1150 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1151 struct net_device *dev,
1152 struct flowi6 *fl6, int flags)
1153 {
1154 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1155 flags |= RT6_LOOKUP_F_IFACE;
1156
1157 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1158 }
1159
1160 void ip6_route_input(struct sk_buff *skb)
1161 {
1162 const struct ipv6hdr *iph = ipv6_hdr(skb);
1163 struct net *net = dev_net(skb->dev);
1164 int flags = RT6_LOOKUP_F_HAS_SADDR;
1165 struct ip_tunnel_info *tun_info;
1166 struct flowi6 fl6 = {
1167 .flowi6_iif = l3mdev_fib_oif(skb->dev),
1168 .daddr = iph->daddr,
1169 .saddr = iph->saddr,
1170 .flowlabel = ip6_flowinfo(iph),
1171 .flowi6_mark = skb->mark,
1172 .flowi6_proto = iph->nexthdr,
1173 };
1174
1175 tun_info = skb_tunnel_info(skb);
1176 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1177 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1178 skb_dst_drop(skb);
1179 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1180 }
1181
1182 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1183 struct flowi6 *fl6, int flags)
1184 {
1185 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1186 }
1187
1188 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1189 struct flowi6 *fl6, int flags)
1190 {
1191 struct dst_entry *dst;
1192 bool any_src;
1193
1194 dst = l3mdev_get_rt6_dst(net, fl6);
1195 if (dst)
1196 return dst;
1197
1198 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1199
1200 any_src = ipv6_addr_any(&fl6->saddr);
1201 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1202 (fl6->flowi6_oif && any_src))
1203 flags |= RT6_LOOKUP_F_IFACE;
1204
1205 if (!any_src)
1206 flags |= RT6_LOOKUP_F_HAS_SADDR;
1207 else if (sk)
1208 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1209
1210 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1211 }
1212 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1213
1214 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1215 {
1216 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1217 struct dst_entry *new = NULL;
1218
1219 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1220 if (rt) {
1221 rt6_info_init(rt);
1222
1223 new = &rt->dst;
1224 new->__use = 1;
1225 new->input = dst_discard;
1226 new->output = dst_discard_out;
1227
1228 dst_copy_metrics(new, &ort->dst);
1229 rt->rt6i_idev = ort->rt6i_idev;
1230 if (rt->rt6i_idev)
1231 in6_dev_hold(rt->rt6i_idev);
1232
1233 rt->rt6i_gateway = ort->rt6i_gateway;
1234 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1235 rt->rt6i_metric = 0;
1236
1237 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1238 #ifdef CONFIG_IPV6_SUBTREES
1239 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1240 #endif
1241
1242 dst_free(new);
1243 }
1244
1245 dst_release(dst_orig);
1246 return new ? new : ERR_PTR(-ENOMEM);
1247 }
1248
1249 /*
1250 * Destination cache support functions
1251 */
1252
1253 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1254 {
1255 if (rt->dst.from &&
1256 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1257 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1258 }
1259
1260 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1261 {
1262 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1263 return NULL;
1264
1265 if (rt6_check_expired(rt))
1266 return NULL;
1267
1268 return &rt->dst;
1269 }
1270
1271 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1272 {
1273 if (!__rt6_check_expired(rt) &&
1274 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1275 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1276 return &rt->dst;
1277 else
1278 return NULL;
1279 }
1280
1281 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1282 {
1283 struct rt6_info *rt;
1284
1285 rt = (struct rt6_info *) dst;
1286
1287 /* All IPV6 dsts are created with ->obsolete set to the value
1288 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1289 * into this function always.
1290 */
1291
1292 rt6_dst_from_metrics_check(rt);
1293
1294 if (rt->rt6i_flags & RTF_PCPU ||
1295 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1296 return rt6_dst_from_check(rt, cookie);
1297 else
1298 return rt6_check(rt, cookie);
1299 }
1300
1301 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1302 {
1303 struct rt6_info *rt = (struct rt6_info *) dst;
1304
1305 if (rt) {
1306 if (rt->rt6i_flags & RTF_CACHE) {
1307 if (rt6_check_expired(rt)) {
1308 ip6_del_rt(rt);
1309 dst = NULL;
1310 }
1311 } else {
1312 dst_release(dst);
1313 dst = NULL;
1314 }
1315 }
1316 return dst;
1317 }
1318
1319 static void ip6_link_failure(struct sk_buff *skb)
1320 {
1321 struct rt6_info *rt;
1322
1323 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1324
1325 rt = (struct rt6_info *) skb_dst(skb);
1326 if (rt) {
1327 if (rt->rt6i_flags & RTF_CACHE) {
1328 dst_hold(&rt->dst);
1329 ip6_del_rt(rt);
1330 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1331 rt->rt6i_node->fn_sernum = -1;
1332 }
1333 }
1334 }
1335
1336 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1337 {
1338 struct net *net = dev_net(rt->dst.dev);
1339
1340 rt->rt6i_flags |= RTF_MODIFIED;
1341 rt->rt6i_pmtu = mtu;
1342 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1343 }
1344
1345 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1346 {
1347 return !(rt->rt6i_flags & RTF_CACHE) &&
1348 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1349 }
1350
1351 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1352 const struct ipv6hdr *iph, u32 mtu)
1353 {
1354 struct rt6_info *rt6 = (struct rt6_info *)dst;
1355
1356 if (rt6->rt6i_flags & RTF_LOCAL)
1357 return;
1358
1359 dst_confirm(dst);
1360 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1361 if (mtu >= dst_mtu(dst))
1362 return;
1363
1364 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1365 rt6_do_update_pmtu(rt6, mtu);
1366 } else {
1367 const struct in6_addr *daddr, *saddr;
1368 struct rt6_info *nrt6;
1369
1370 if (iph) {
1371 daddr = &iph->daddr;
1372 saddr = &iph->saddr;
1373 } else if (sk) {
1374 daddr = &sk->sk_v6_daddr;
1375 saddr = &inet6_sk(sk)->saddr;
1376 } else {
1377 return;
1378 }
1379 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1380 if (nrt6) {
1381 rt6_do_update_pmtu(nrt6, mtu);
1382
1383 /* ip6_ins_rt(nrt6) will bump the
1384 * rt6->rt6i_node->fn_sernum
1385 * which will fail the next rt6_check() and
1386 * invalidate the sk->sk_dst_cache.
1387 */
1388 ip6_ins_rt(nrt6);
1389 }
1390 }
1391 }
1392
1393 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1394 struct sk_buff *skb, u32 mtu)
1395 {
1396 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1397 }
1398
1399 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1400 int oif, u32 mark)
1401 {
1402 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1403 struct dst_entry *dst;
1404 struct flowi6 fl6;
1405
1406 memset(&fl6, 0, sizeof(fl6));
1407 fl6.flowi6_oif = oif;
1408 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1409 fl6.daddr = iph->daddr;
1410 fl6.saddr = iph->saddr;
1411 fl6.flowlabel = ip6_flowinfo(iph);
1412
1413 dst = ip6_route_output(net, NULL, &fl6);
1414 if (!dst->error)
1415 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1416 dst_release(dst);
1417 }
1418 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1419
1420 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1421 {
1422 struct dst_entry *dst;
1423
1424 ip6_update_pmtu(skb, sock_net(sk), mtu,
1425 sk->sk_bound_dev_if, sk->sk_mark);
1426
1427 dst = __sk_dst_get(sk);
1428 if (!dst || !dst->obsolete ||
1429 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1430 return;
1431
1432 bh_lock_sock(sk);
1433 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1434 ip6_datagram_dst_update(sk, false);
1435 bh_unlock_sock(sk);
1436 }
1437 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1438
1439 /* Handle redirects */
1440 struct ip6rd_flowi {
1441 struct flowi6 fl6;
1442 struct in6_addr gateway;
1443 };
1444
1445 static struct rt6_info *__ip6_route_redirect(struct net *net,
1446 struct fib6_table *table,
1447 struct flowi6 *fl6,
1448 int flags)
1449 {
1450 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1451 struct rt6_info *rt;
1452 struct fib6_node *fn;
1453
1454 /* Get the "current" route for this destination and
1455 * check if the redirect has come from approriate router.
1456 *
1457 * RFC 4861 specifies that redirects should only be
1458 * accepted if they come from the nexthop to the target.
1459 * Due to the way the routes are chosen, this notion
1460 * is a bit fuzzy and one might need to check all possible
1461 * routes.
1462 */
1463
1464 read_lock_bh(&table->tb6_lock);
1465 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1466 restart:
1467 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1468 if (rt6_check_expired(rt))
1469 continue;
1470 if (rt->dst.error)
1471 break;
1472 if (!(rt->rt6i_flags & RTF_GATEWAY))
1473 continue;
1474 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1475 continue;
1476 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1477 continue;
1478 break;
1479 }
1480
1481 if (!rt)
1482 rt = net->ipv6.ip6_null_entry;
1483 else if (rt->dst.error) {
1484 rt = net->ipv6.ip6_null_entry;
1485 goto out;
1486 }
1487
1488 if (rt == net->ipv6.ip6_null_entry) {
1489 fn = fib6_backtrack(fn, &fl6->saddr);
1490 if (fn)
1491 goto restart;
1492 }
1493
1494 out:
1495 dst_hold(&rt->dst);
1496
1497 read_unlock_bh(&table->tb6_lock);
1498
1499 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1500 return rt;
1501 };
1502
1503 static struct dst_entry *ip6_route_redirect(struct net *net,
1504 const struct flowi6 *fl6,
1505 const struct in6_addr *gateway)
1506 {
1507 int flags = RT6_LOOKUP_F_HAS_SADDR;
1508 struct ip6rd_flowi rdfl;
1509
1510 rdfl.fl6 = *fl6;
1511 rdfl.gateway = *gateway;
1512
1513 return fib6_rule_lookup(net, &rdfl.fl6,
1514 flags, __ip6_route_redirect);
1515 }
1516
1517 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1518 {
1519 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1520 struct dst_entry *dst;
1521 struct flowi6 fl6;
1522
1523 memset(&fl6, 0, sizeof(fl6));
1524 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1525 fl6.flowi6_oif = oif;
1526 fl6.flowi6_mark = mark;
1527 fl6.daddr = iph->daddr;
1528 fl6.saddr = iph->saddr;
1529 fl6.flowlabel = ip6_flowinfo(iph);
1530
1531 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1532 rt6_do_redirect(dst, NULL, skb);
1533 dst_release(dst);
1534 }
1535 EXPORT_SYMBOL_GPL(ip6_redirect);
1536
1537 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1538 u32 mark)
1539 {
1540 const struct ipv6hdr *iph = ipv6_hdr(skb);
1541 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1542 struct dst_entry *dst;
1543 struct flowi6 fl6;
1544
1545 memset(&fl6, 0, sizeof(fl6));
1546 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1547 fl6.flowi6_oif = oif;
1548 fl6.flowi6_mark = mark;
1549 fl6.daddr = msg->dest;
1550 fl6.saddr = iph->daddr;
1551
1552 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1553 rt6_do_redirect(dst, NULL, skb);
1554 dst_release(dst);
1555 }
1556
1557 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1558 {
1559 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1560 }
1561 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1562
1563 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1564 {
1565 struct net_device *dev = dst->dev;
1566 unsigned int mtu = dst_mtu(dst);
1567 struct net *net = dev_net(dev);
1568
1569 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1570
1571 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1572 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1573
1574 /*
1575 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1576 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1577 * IPV6_MAXPLEN is also valid and means: "any MSS,
1578 * rely only on pmtu discovery"
1579 */
1580 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1581 mtu = IPV6_MAXPLEN;
1582 return mtu;
1583 }
1584
1585 static unsigned int ip6_mtu(const struct dst_entry *dst)
1586 {
1587 const struct rt6_info *rt = (const struct rt6_info *)dst;
1588 unsigned int mtu = rt->rt6i_pmtu;
1589 struct inet6_dev *idev;
1590
1591 if (mtu)
1592 goto out;
1593
1594 mtu = dst_metric_raw(dst, RTAX_MTU);
1595 if (mtu)
1596 goto out;
1597
1598 mtu = IPV6_MIN_MTU;
1599
1600 rcu_read_lock();
1601 idev = __in6_dev_get(dst->dev);
1602 if (idev)
1603 mtu = idev->cnf.mtu6;
1604 rcu_read_unlock();
1605
1606 out:
1607 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1608 }
1609
1610 static struct dst_entry *icmp6_dst_gc_list;
1611 static DEFINE_SPINLOCK(icmp6_dst_lock);
1612
1613 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1614 struct flowi6 *fl6)
1615 {
1616 struct dst_entry *dst;
1617 struct rt6_info *rt;
1618 struct inet6_dev *idev = in6_dev_get(dev);
1619 struct net *net = dev_net(dev);
1620
1621 if (unlikely(!idev))
1622 return ERR_PTR(-ENODEV);
1623
1624 rt = ip6_dst_alloc(net, dev, 0);
1625 if (unlikely(!rt)) {
1626 in6_dev_put(idev);
1627 dst = ERR_PTR(-ENOMEM);
1628 goto out;
1629 }
1630
1631 rt->dst.flags |= DST_HOST;
1632 rt->dst.output = ip6_output;
1633 atomic_set(&rt->dst.__refcnt, 1);
1634 rt->rt6i_gateway = fl6->daddr;
1635 rt->rt6i_dst.addr = fl6->daddr;
1636 rt->rt6i_dst.plen = 128;
1637 rt->rt6i_idev = idev;
1638 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1639
1640 spin_lock_bh(&icmp6_dst_lock);
1641 rt->dst.next = icmp6_dst_gc_list;
1642 icmp6_dst_gc_list = &rt->dst;
1643 spin_unlock_bh(&icmp6_dst_lock);
1644
1645 fib6_force_start_gc(net);
1646
1647 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1648
1649 out:
1650 return dst;
1651 }
1652
1653 int icmp6_dst_gc(void)
1654 {
1655 struct dst_entry *dst, **pprev;
1656 int more = 0;
1657
1658 spin_lock_bh(&icmp6_dst_lock);
1659 pprev = &icmp6_dst_gc_list;
1660
1661 while ((dst = *pprev) != NULL) {
1662 if (!atomic_read(&dst->__refcnt)) {
1663 *pprev = dst->next;
1664 dst_free(dst);
1665 } else {
1666 pprev = &dst->next;
1667 ++more;
1668 }
1669 }
1670
1671 spin_unlock_bh(&icmp6_dst_lock);
1672
1673 return more;
1674 }
1675
1676 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1677 void *arg)
1678 {
1679 struct dst_entry *dst, **pprev;
1680
1681 spin_lock_bh(&icmp6_dst_lock);
1682 pprev = &icmp6_dst_gc_list;
1683 while ((dst = *pprev) != NULL) {
1684 struct rt6_info *rt = (struct rt6_info *) dst;
1685 if (func(rt, arg)) {
1686 *pprev = dst->next;
1687 dst_free(dst);
1688 } else {
1689 pprev = &dst->next;
1690 }
1691 }
1692 spin_unlock_bh(&icmp6_dst_lock);
1693 }
1694
1695 static int ip6_dst_gc(struct dst_ops *ops)
1696 {
1697 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1698 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1699 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1700 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1701 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1702 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1703 int entries;
1704
1705 entries = dst_entries_get_fast(ops);
1706 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1707 entries <= rt_max_size)
1708 goto out;
1709
1710 net->ipv6.ip6_rt_gc_expire++;
1711 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1712 entries = dst_entries_get_slow(ops);
1713 if (entries < ops->gc_thresh)
1714 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1715 out:
1716 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1717 return entries > rt_max_size;
1718 }
1719
1720 static int ip6_convert_metrics(struct mx6_config *mxc,
1721 const struct fib6_config *cfg)
1722 {
1723 bool ecn_ca = false;
1724 struct nlattr *nla;
1725 int remaining;
1726 u32 *mp;
1727
1728 if (!cfg->fc_mx)
1729 return 0;
1730
1731 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1732 if (unlikely(!mp))
1733 return -ENOMEM;
1734
1735 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1736 int type = nla_type(nla);
1737 u32 val;
1738
1739 if (!type)
1740 continue;
1741 if (unlikely(type > RTAX_MAX))
1742 goto err;
1743
1744 if (type == RTAX_CC_ALGO) {
1745 char tmp[TCP_CA_NAME_MAX];
1746
1747 nla_strlcpy(tmp, nla, sizeof(tmp));
1748 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1749 if (val == TCP_CA_UNSPEC)
1750 goto err;
1751 } else {
1752 val = nla_get_u32(nla);
1753 }
1754 if (type == RTAX_HOPLIMIT && val > 255)
1755 val = 255;
1756 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1757 goto err;
1758
1759 mp[type - 1] = val;
1760 __set_bit(type - 1, mxc->mx_valid);
1761 }
1762
1763 if (ecn_ca) {
1764 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1765 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1766 }
1767
1768 mxc->mx = mp;
1769 return 0;
1770 err:
1771 kfree(mp);
1772 return -EINVAL;
1773 }
1774
1775 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1776 struct fib6_config *cfg,
1777 const struct in6_addr *gw_addr)
1778 {
1779 struct flowi6 fl6 = {
1780 .flowi6_oif = cfg->fc_ifindex,
1781 .daddr = *gw_addr,
1782 .saddr = cfg->fc_prefsrc,
1783 };
1784 struct fib6_table *table;
1785 struct rt6_info *rt;
1786 int flags = RT6_LOOKUP_F_IFACE;
1787
1788 table = fib6_get_table(net, cfg->fc_table);
1789 if (!table)
1790 return NULL;
1791
1792 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1793 flags |= RT6_LOOKUP_F_HAS_SADDR;
1794
1795 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1796
1797 /* if table lookup failed, fall back to full lookup */
1798 if (rt == net->ipv6.ip6_null_entry) {
1799 ip6_rt_put(rt);
1800 rt = NULL;
1801 }
1802
1803 return rt;
1804 }
1805
1806 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1807 {
1808 struct net *net = cfg->fc_nlinfo.nl_net;
1809 struct rt6_info *rt = NULL;
1810 struct net_device *dev = NULL;
1811 struct inet6_dev *idev = NULL;
1812 struct fib6_table *table;
1813 int addr_type;
1814 int err = -EINVAL;
1815
1816 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1817 goto out;
1818 #ifndef CONFIG_IPV6_SUBTREES
1819 if (cfg->fc_src_len)
1820 goto out;
1821 #endif
1822 if (cfg->fc_ifindex) {
1823 err = -ENODEV;
1824 dev = dev_get_by_index(net, cfg->fc_ifindex);
1825 if (!dev)
1826 goto out;
1827 idev = in6_dev_get(dev);
1828 if (!idev)
1829 goto out;
1830 }
1831
1832 if (cfg->fc_metric == 0)
1833 cfg->fc_metric = IP6_RT_PRIO_USER;
1834
1835 err = -ENOBUFS;
1836 if (cfg->fc_nlinfo.nlh &&
1837 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1838 table = fib6_get_table(net, cfg->fc_table);
1839 if (!table) {
1840 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1841 table = fib6_new_table(net, cfg->fc_table);
1842 }
1843 } else {
1844 table = fib6_new_table(net, cfg->fc_table);
1845 }
1846
1847 if (!table)
1848 goto out;
1849
1850 rt = ip6_dst_alloc(net, NULL,
1851 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1852
1853 if (!rt) {
1854 err = -ENOMEM;
1855 goto out;
1856 }
1857
1858 if (cfg->fc_flags & RTF_EXPIRES)
1859 rt6_set_expires(rt, jiffies +
1860 clock_t_to_jiffies(cfg->fc_expires));
1861 else
1862 rt6_clean_expires(rt);
1863
1864 if (cfg->fc_protocol == RTPROT_UNSPEC)
1865 cfg->fc_protocol = RTPROT_BOOT;
1866 rt->rt6i_protocol = cfg->fc_protocol;
1867
1868 addr_type = ipv6_addr_type(&cfg->fc_dst);
1869
1870 if (addr_type & IPV6_ADDR_MULTICAST)
1871 rt->dst.input = ip6_mc_input;
1872 else if (cfg->fc_flags & RTF_LOCAL)
1873 rt->dst.input = ip6_input;
1874 else
1875 rt->dst.input = ip6_forward;
1876
1877 rt->dst.output = ip6_output;
1878
1879 if (cfg->fc_encap) {
1880 struct lwtunnel_state *lwtstate;
1881
1882 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1883 cfg->fc_encap, AF_INET6, cfg,
1884 &lwtstate);
1885 if (err)
1886 goto out;
1887 rt->dst.lwtstate = lwtstate_get(lwtstate);
1888 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1889 rt->dst.lwtstate->orig_output = rt->dst.output;
1890 rt->dst.output = lwtunnel_output;
1891 }
1892 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1893 rt->dst.lwtstate->orig_input = rt->dst.input;
1894 rt->dst.input = lwtunnel_input;
1895 }
1896 }
1897
1898 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1899 rt->rt6i_dst.plen = cfg->fc_dst_len;
1900 if (rt->rt6i_dst.plen == 128)
1901 rt->dst.flags |= DST_HOST;
1902
1903 #ifdef CONFIG_IPV6_SUBTREES
1904 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1905 rt->rt6i_src.plen = cfg->fc_src_len;
1906 #endif
1907
1908 rt->rt6i_metric = cfg->fc_metric;
1909
1910 /* We cannot add true routes via loopback here,
1911 they would result in kernel looping; promote them to reject routes
1912 */
1913 if ((cfg->fc_flags & RTF_REJECT) ||
1914 (dev && (dev->flags & IFF_LOOPBACK) &&
1915 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1916 !(cfg->fc_flags & RTF_LOCAL))) {
1917 /* hold loopback dev/idev if we haven't done so. */
1918 if (dev != net->loopback_dev) {
1919 if (dev) {
1920 dev_put(dev);
1921 in6_dev_put(idev);
1922 }
1923 dev = net->loopback_dev;
1924 dev_hold(dev);
1925 idev = in6_dev_get(dev);
1926 if (!idev) {
1927 err = -ENODEV;
1928 goto out;
1929 }
1930 }
1931 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1932 switch (cfg->fc_type) {
1933 case RTN_BLACKHOLE:
1934 rt->dst.error = -EINVAL;
1935 rt->dst.output = dst_discard_out;
1936 rt->dst.input = dst_discard;
1937 break;
1938 case RTN_PROHIBIT:
1939 rt->dst.error = -EACCES;
1940 rt->dst.output = ip6_pkt_prohibit_out;
1941 rt->dst.input = ip6_pkt_prohibit;
1942 break;
1943 case RTN_THROW:
1944 case RTN_UNREACHABLE:
1945 default:
1946 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1947 : (cfg->fc_type == RTN_UNREACHABLE)
1948 ? -EHOSTUNREACH : -ENETUNREACH;
1949 rt->dst.output = ip6_pkt_discard_out;
1950 rt->dst.input = ip6_pkt_discard;
1951 break;
1952 }
1953 goto install_route;
1954 }
1955
1956 if (cfg->fc_flags & RTF_GATEWAY) {
1957 const struct in6_addr *gw_addr;
1958 int gwa_type;
1959
1960 gw_addr = &cfg->fc_gateway;
1961 gwa_type = ipv6_addr_type(gw_addr);
1962
1963 /* if gw_addr is local we will fail to detect this in case
1964 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1965 * will return already-added prefix route via interface that
1966 * prefix route was assigned to, which might be non-loopback.
1967 */
1968 err = -EINVAL;
1969 if (ipv6_chk_addr_and_flags(net, gw_addr,
1970 gwa_type & IPV6_ADDR_LINKLOCAL ?
1971 dev : NULL, 0, 0))
1972 goto out;
1973
1974 rt->rt6i_gateway = *gw_addr;
1975
1976 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1977 struct rt6_info *grt = NULL;
1978
1979 /* IPv6 strictly inhibits using not link-local
1980 addresses as nexthop address.
1981 Otherwise, router will not able to send redirects.
1982 It is very good, but in some (rare!) circumstances
1983 (SIT, PtP, NBMA NOARP links) it is handy to allow
1984 some exceptions. --ANK
1985 */
1986 if (!(gwa_type & IPV6_ADDR_UNICAST))
1987 goto out;
1988
1989 if (cfg->fc_table)
1990 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1991
1992 if (!grt)
1993 grt = rt6_lookup(net, gw_addr, NULL,
1994 cfg->fc_ifindex, 1);
1995
1996 err = -EHOSTUNREACH;
1997 if (!grt)
1998 goto out;
1999 if (dev) {
2000 if (dev != grt->dst.dev) {
2001 ip6_rt_put(grt);
2002 goto out;
2003 }
2004 } else {
2005 dev = grt->dst.dev;
2006 idev = grt->rt6i_idev;
2007 dev_hold(dev);
2008 in6_dev_hold(grt->rt6i_idev);
2009 }
2010 if (!(grt->rt6i_flags & RTF_GATEWAY))
2011 err = 0;
2012 ip6_rt_put(grt);
2013
2014 if (err)
2015 goto out;
2016 }
2017 err = -EINVAL;
2018 if (!dev || (dev->flags & IFF_LOOPBACK))
2019 goto out;
2020 }
2021
2022 err = -ENODEV;
2023 if (!dev)
2024 goto out;
2025
2026 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2027 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2028 err = -EINVAL;
2029 goto out;
2030 }
2031 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2032 rt->rt6i_prefsrc.plen = 128;
2033 } else
2034 rt->rt6i_prefsrc.plen = 0;
2035
2036 rt->rt6i_flags = cfg->fc_flags;
2037
2038 install_route:
2039 rt->dst.dev = dev;
2040 rt->rt6i_idev = idev;
2041 rt->rt6i_table = table;
2042
2043 cfg->fc_nlinfo.nl_net = dev_net(dev);
2044
2045 return rt;
2046 out:
2047 if (dev)
2048 dev_put(dev);
2049 if (idev)
2050 in6_dev_put(idev);
2051 if (rt)
2052 dst_free(&rt->dst);
2053
2054 return ERR_PTR(err);
2055 }
2056
2057 int ip6_route_add(struct fib6_config *cfg)
2058 {
2059 struct mx6_config mxc = { .mx = NULL, };
2060 struct rt6_info *rt;
2061 int err;
2062
2063 rt = ip6_route_info_create(cfg);
2064 if (IS_ERR(rt)) {
2065 err = PTR_ERR(rt);
2066 rt = NULL;
2067 goto out;
2068 }
2069
2070 err = ip6_convert_metrics(&mxc, cfg);
2071 if (err)
2072 goto out;
2073
2074 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2075
2076 kfree(mxc.mx);
2077
2078 return err;
2079 out:
2080 if (rt)
2081 dst_free(&rt->dst);
2082
2083 return err;
2084 }
2085
2086 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2087 {
2088 int err;
2089 struct fib6_table *table;
2090 struct net *net = dev_net(rt->dst.dev);
2091
2092 if (rt == net->ipv6.ip6_null_entry ||
2093 rt->dst.flags & DST_NOCACHE) {
2094 err = -ENOENT;
2095 goto out;
2096 }
2097
2098 table = rt->rt6i_table;
2099 write_lock_bh(&table->tb6_lock);
2100 err = fib6_del(rt, info);
2101 write_unlock_bh(&table->tb6_lock);
2102
2103 out:
2104 ip6_rt_put(rt);
2105 return err;
2106 }
2107
2108 int ip6_del_rt(struct rt6_info *rt)
2109 {
2110 struct nl_info info = {
2111 .nl_net = dev_net(rt->dst.dev),
2112 };
2113 return __ip6_del_rt(rt, &info);
2114 }
2115
2116 static int ip6_route_del(struct fib6_config *cfg)
2117 {
2118 struct fib6_table *table;
2119 struct fib6_node *fn;
2120 struct rt6_info *rt;
2121 int err = -ESRCH;
2122
2123 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2124 if (!table)
2125 return err;
2126
2127 read_lock_bh(&table->tb6_lock);
2128
2129 fn = fib6_locate(&table->tb6_root,
2130 &cfg->fc_dst, cfg->fc_dst_len,
2131 &cfg->fc_src, cfg->fc_src_len);
2132
2133 if (fn) {
2134 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2135 if ((rt->rt6i_flags & RTF_CACHE) &&
2136 !(cfg->fc_flags & RTF_CACHE))
2137 continue;
2138 if (cfg->fc_ifindex &&
2139 (!rt->dst.dev ||
2140 rt->dst.dev->ifindex != cfg->fc_ifindex))
2141 continue;
2142 if (cfg->fc_flags & RTF_GATEWAY &&
2143 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2144 continue;
2145 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2146 continue;
2147 dst_hold(&rt->dst);
2148 read_unlock_bh(&table->tb6_lock);
2149
2150 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2151 }
2152 }
2153 read_unlock_bh(&table->tb6_lock);
2154
2155 return err;
2156 }
2157
2158 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2159 {
2160 struct netevent_redirect netevent;
2161 struct rt6_info *rt, *nrt = NULL;
2162 struct ndisc_options ndopts;
2163 struct inet6_dev *in6_dev;
2164 struct neighbour *neigh;
2165 struct rd_msg *msg;
2166 int optlen, on_link;
2167 u8 *lladdr;
2168
2169 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2170 optlen -= sizeof(*msg);
2171
2172 if (optlen < 0) {
2173 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2174 return;
2175 }
2176
2177 msg = (struct rd_msg *)icmp6_hdr(skb);
2178
2179 if (ipv6_addr_is_multicast(&msg->dest)) {
2180 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2181 return;
2182 }
2183
2184 on_link = 0;
2185 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2186 on_link = 1;
2187 } else if (ipv6_addr_type(&msg->target) !=
2188 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2189 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2190 return;
2191 }
2192
2193 in6_dev = __in6_dev_get(skb->dev);
2194 if (!in6_dev)
2195 return;
2196 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2197 return;
2198
2199 /* RFC2461 8.1:
2200 * The IP source address of the Redirect MUST be the same as the current
2201 * first-hop router for the specified ICMP Destination Address.
2202 */
2203
2204 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
2205 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2206 return;
2207 }
2208
2209 lladdr = NULL;
2210 if (ndopts.nd_opts_tgt_lladdr) {
2211 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2212 skb->dev);
2213 if (!lladdr) {
2214 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2215 return;
2216 }
2217 }
2218
2219 rt = (struct rt6_info *) dst;
2220 if (rt->rt6i_flags & RTF_REJECT) {
2221 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2222 return;
2223 }
2224
2225 /* Redirect received -> path was valid.
2226 * Look, redirects are sent only in response to data packets,
2227 * so that this nexthop apparently is reachable. --ANK
2228 */
2229 dst_confirm(&rt->dst);
2230
2231 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2232 if (!neigh)
2233 return;
2234
2235 /*
2236 * We have finally decided to accept it.
2237 */
2238
2239 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
2240 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2241 NEIGH_UPDATE_F_OVERRIDE|
2242 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2243 NEIGH_UPDATE_F_ISROUTER)),
2244 NDISC_REDIRECT, &ndopts);
2245
2246 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2247 if (!nrt)
2248 goto out;
2249
2250 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2251 if (on_link)
2252 nrt->rt6i_flags &= ~RTF_GATEWAY;
2253
2254 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2255
2256 if (ip6_ins_rt(nrt))
2257 goto out;
2258
2259 netevent.old = &rt->dst;
2260 netevent.new = &nrt->dst;
2261 netevent.daddr = &msg->dest;
2262 netevent.neigh = neigh;
2263 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2264
2265 if (rt->rt6i_flags & RTF_CACHE) {
2266 rt = (struct rt6_info *) dst_clone(&rt->dst);
2267 ip6_del_rt(rt);
2268 }
2269
2270 out:
2271 neigh_release(neigh);
2272 }
2273
2274 /*
2275 * Misc support functions
2276 */
2277
2278 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2279 {
2280 BUG_ON(from->dst.from);
2281
2282 rt->rt6i_flags &= ~RTF_EXPIRES;
2283 dst_hold(&from->dst);
2284 rt->dst.from = &from->dst;
2285 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2286 }
2287
2288 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2289 {
2290 rt->dst.input = ort->dst.input;
2291 rt->dst.output = ort->dst.output;
2292 rt->rt6i_dst = ort->rt6i_dst;
2293 rt->dst.error = ort->dst.error;
2294 rt->rt6i_idev = ort->rt6i_idev;
2295 if (rt->rt6i_idev)
2296 in6_dev_hold(rt->rt6i_idev);
2297 rt->dst.lastuse = jiffies;
2298 rt->rt6i_gateway = ort->rt6i_gateway;
2299 rt->rt6i_flags = ort->rt6i_flags;
2300 rt6_set_from(rt, ort);
2301 rt->rt6i_metric = ort->rt6i_metric;
2302 #ifdef CONFIG_IPV6_SUBTREES
2303 rt->rt6i_src = ort->rt6i_src;
2304 #endif
2305 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2306 rt->rt6i_table = ort->rt6i_table;
2307 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2308 }
2309
2310 #ifdef CONFIG_IPV6_ROUTE_INFO
2311 static struct rt6_info *rt6_get_route_info(struct net *net,
2312 const struct in6_addr *prefix, int prefixlen,
2313 const struct in6_addr *gwaddr, int ifindex)
2314 {
2315 struct fib6_node *fn;
2316 struct rt6_info *rt = NULL;
2317 struct fib6_table *table;
2318
2319 table = fib6_get_table(net, RT6_TABLE_INFO);
2320 if (!table)
2321 return NULL;
2322
2323 read_lock_bh(&table->tb6_lock);
2324 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2325 if (!fn)
2326 goto out;
2327
2328 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2329 if (rt->dst.dev->ifindex != ifindex)
2330 continue;
2331 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2332 continue;
2333 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2334 continue;
2335 dst_hold(&rt->dst);
2336 break;
2337 }
2338 out:
2339 read_unlock_bh(&table->tb6_lock);
2340 return rt;
2341 }
2342
2343 static struct rt6_info *rt6_add_route_info(struct net *net,
2344 const struct in6_addr *prefix, int prefixlen,
2345 const struct in6_addr *gwaddr, int ifindex,
2346 unsigned int pref)
2347 {
2348 struct fib6_config cfg = {
2349 .fc_metric = IP6_RT_PRIO_USER,
2350 .fc_ifindex = ifindex,
2351 .fc_dst_len = prefixlen,
2352 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2353 RTF_UP | RTF_PREF(pref),
2354 .fc_nlinfo.portid = 0,
2355 .fc_nlinfo.nlh = NULL,
2356 .fc_nlinfo.nl_net = net,
2357 };
2358
2359 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
2360 cfg.fc_dst = *prefix;
2361 cfg.fc_gateway = *gwaddr;
2362
2363 /* We should treat it as a default route if prefix length is 0. */
2364 if (!prefixlen)
2365 cfg.fc_flags |= RTF_DEFAULT;
2366
2367 ip6_route_add(&cfg);
2368
2369 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2370 }
2371 #endif
2372
2373 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2374 {
2375 struct rt6_info *rt;
2376 struct fib6_table *table;
2377
2378 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2379 if (!table)
2380 return NULL;
2381
2382 read_lock_bh(&table->tb6_lock);
2383 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2384 if (dev == rt->dst.dev &&
2385 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2386 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2387 break;
2388 }
2389 if (rt)
2390 dst_hold(&rt->dst);
2391 read_unlock_bh(&table->tb6_lock);
2392 return rt;
2393 }
2394
2395 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2396 struct net_device *dev,
2397 unsigned int pref)
2398 {
2399 struct fib6_config cfg = {
2400 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2401 .fc_metric = IP6_RT_PRIO_USER,
2402 .fc_ifindex = dev->ifindex,
2403 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2404 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2405 .fc_nlinfo.portid = 0,
2406 .fc_nlinfo.nlh = NULL,
2407 .fc_nlinfo.nl_net = dev_net(dev),
2408 };
2409
2410 cfg.fc_gateway = *gwaddr;
2411
2412 ip6_route_add(&cfg);
2413
2414 return rt6_get_dflt_router(gwaddr, dev);
2415 }
2416
2417 void rt6_purge_dflt_routers(struct net *net)
2418 {
2419 struct rt6_info *rt;
2420 struct fib6_table *table;
2421
2422 /* NOTE: Keep consistent with rt6_get_dflt_router */
2423 table = fib6_get_table(net, RT6_TABLE_DFLT);
2424 if (!table)
2425 return;
2426
2427 restart:
2428 read_lock_bh(&table->tb6_lock);
2429 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2430 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2431 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2432 dst_hold(&rt->dst);
2433 read_unlock_bh(&table->tb6_lock);
2434 ip6_del_rt(rt);
2435 goto restart;
2436 }
2437 }
2438 read_unlock_bh(&table->tb6_lock);
2439 }
2440
2441 static void rtmsg_to_fib6_config(struct net *net,
2442 struct in6_rtmsg *rtmsg,
2443 struct fib6_config *cfg)
2444 {
2445 memset(cfg, 0, sizeof(*cfg));
2446
2447 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2448 : RT6_TABLE_MAIN;
2449 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2450 cfg->fc_metric = rtmsg->rtmsg_metric;
2451 cfg->fc_expires = rtmsg->rtmsg_info;
2452 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2453 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2454 cfg->fc_flags = rtmsg->rtmsg_flags;
2455
2456 cfg->fc_nlinfo.nl_net = net;
2457
2458 cfg->fc_dst = rtmsg->rtmsg_dst;
2459 cfg->fc_src = rtmsg->rtmsg_src;
2460 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2461 }
2462
2463 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2464 {
2465 struct fib6_config cfg;
2466 struct in6_rtmsg rtmsg;
2467 int err;
2468
2469 switch (cmd) {
2470 case SIOCADDRT: /* Add a route */
2471 case SIOCDELRT: /* Delete a route */
2472 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2473 return -EPERM;
2474 err = copy_from_user(&rtmsg, arg,
2475 sizeof(struct in6_rtmsg));
2476 if (err)
2477 return -EFAULT;
2478
2479 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2480
2481 rtnl_lock();
2482 switch (cmd) {
2483 case SIOCADDRT:
2484 err = ip6_route_add(&cfg);
2485 break;
2486 case SIOCDELRT:
2487 err = ip6_route_del(&cfg);
2488 break;
2489 default:
2490 err = -EINVAL;
2491 }
2492 rtnl_unlock();
2493
2494 return err;
2495 }
2496
2497 return -EINVAL;
2498 }
2499
2500 /*
2501 * Drop the packet on the floor
2502 */
2503
2504 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2505 {
2506 int type;
2507 struct dst_entry *dst = skb_dst(skb);
2508 switch (ipstats_mib_noroutes) {
2509 case IPSTATS_MIB_INNOROUTES:
2510 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2511 if (type == IPV6_ADDR_ANY) {
2512 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2513 IPSTATS_MIB_INADDRERRORS);
2514 break;
2515 }
2516 /* FALLTHROUGH */
2517 case IPSTATS_MIB_OUTNOROUTES:
2518 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2519 ipstats_mib_noroutes);
2520 break;
2521 }
2522 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2523 kfree_skb(skb);
2524 return 0;
2525 }
2526
2527 static int ip6_pkt_discard(struct sk_buff *skb)
2528 {
2529 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2530 }
2531
2532 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2533 {
2534 skb->dev = skb_dst(skb)->dev;
2535 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2536 }
2537
2538 static int ip6_pkt_prohibit(struct sk_buff *skb)
2539 {
2540 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2541 }
2542
2543 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2544 {
2545 skb->dev = skb_dst(skb)->dev;
2546 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2547 }
2548
2549 /*
2550 * Allocate a dst for local (unicast / anycast) address.
2551 */
2552
2553 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2554 const struct in6_addr *addr,
2555 bool anycast)
2556 {
2557 u32 tb_id;
2558 struct net *net = dev_net(idev->dev);
2559 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2560 DST_NOCOUNT);
2561 if (!rt)
2562 return ERR_PTR(-ENOMEM);
2563
2564 in6_dev_hold(idev);
2565
2566 rt->dst.flags |= DST_HOST;
2567 rt->dst.input = ip6_input;
2568 rt->dst.output = ip6_output;
2569 rt->rt6i_idev = idev;
2570
2571 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2572 if (anycast)
2573 rt->rt6i_flags |= RTF_ANYCAST;
2574 else
2575 rt->rt6i_flags |= RTF_LOCAL;
2576
2577 rt->rt6i_gateway = *addr;
2578 rt->rt6i_dst.addr = *addr;
2579 rt->rt6i_dst.plen = 128;
2580 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2581 rt->rt6i_table = fib6_get_table(net, tb_id);
2582 rt->dst.flags |= DST_NOCACHE;
2583
2584 atomic_set(&rt->dst.__refcnt, 1);
2585
2586 return rt;
2587 }
2588
2589 /* remove deleted ip from prefsrc entries */
2590 struct arg_dev_net_ip {
2591 struct net_device *dev;
2592 struct net *net;
2593 struct in6_addr *addr;
2594 };
2595
2596 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2597 {
2598 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2599 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2600 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2601
2602 if (((void *)rt->dst.dev == dev || !dev) &&
2603 rt != net->ipv6.ip6_null_entry &&
2604 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2605 /* remove prefsrc entry */
2606 rt->rt6i_prefsrc.plen = 0;
2607 }
2608 return 0;
2609 }
2610
2611 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2612 {
2613 struct net *net = dev_net(ifp->idev->dev);
2614 struct arg_dev_net_ip adni = {
2615 .dev = ifp->idev->dev,
2616 .net = net,
2617 .addr = &ifp->addr,
2618 };
2619 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2620 }
2621
2622 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2623 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2624
2625 /* Remove routers and update dst entries when gateway turn into host. */
2626 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2627 {
2628 struct in6_addr *gateway = (struct in6_addr *)arg;
2629
2630 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2631 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2632 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2633 return -1;
2634 }
2635 return 0;
2636 }
2637
2638 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2639 {
2640 fib6_clean_all(net, fib6_clean_tohost, gateway);
2641 }
2642
2643 struct arg_dev_net {
2644 struct net_device *dev;
2645 struct net *net;
2646 };
2647
2648 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2649 {
2650 const struct arg_dev_net *adn = arg;
2651 const struct net_device *dev = adn->dev;
2652
2653 if ((rt->dst.dev == dev || !dev) &&
2654 rt != adn->net->ipv6.ip6_null_entry)
2655 return -1;
2656
2657 return 0;
2658 }
2659
2660 void rt6_ifdown(struct net *net, struct net_device *dev)
2661 {
2662 struct arg_dev_net adn = {
2663 .dev = dev,
2664 .net = net,
2665 };
2666
2667 fib6_clean_all(net, fib6_ifdown, &adn);
2668 icmp6_clean_all(fib6_ifdown, &adn);
2669 if (dev)
2670 rt6_uncached_list_flush_dev(net, dev);
2671 }
2672
2673 struct rt6_mtu_change_arg {
2674 struct net_device *dev;
2675 unsigned int mtu;
2676 };
2677
2678 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2679 {
2680 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2681 struct inet6_dev *idev;
2682
2683 /* In IPv6 pmtu discovery is not optional,
2684 so that RTAX_MTU lock cannot disable it.
2685 We still use this lock to block changes
2686 caused by addrconf/ndisc.
2687 */
2688
2689 idev = __in6_dev_get(arg->dev);
2690 if (!idev)
2691 return 0;
2692
2693 /* For administrative MTU increase, there is no way to discover
2694 IPv6 PMTU increase, so PMTU increase should be updated here.
2695 Since RFC 1981 doesn't include administrative MTU increase
2696 update PMTU increase is a MUST. (i.e. jumbo frame)
2697 */
2698 /*
2699 If new MTU is less than route PMTU, this new MTU will be the
2700 lowest MTU in the path, update the route PMTU to reflect PMTU
2701 decreases; if new MTU is greater than route PMTU, and the
2702 old MTU is the lowest MTU in the path, update the route PMTU
2703 to reflect the increase. In this case if the other nodes' MTU
2704 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2705 PMTU discouvery.
2706 */
2707 if (rt->dst.dev == arg->dev &&
2708 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2709 if (rt->rt6i_flags & RTF_CACHE) {
2710 /* For RTF_CACHE with rt6i_pmtu == 0
2711 * (i.e. a redirected route),
2712 * the metrics of its rt->dst.from has already
2713 * been updated.
2714 */
2715 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2716 rt->rt6i_pmtu = arg->mtu;
2717 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2718 (dst_mtu(&rt->dst) < arg->mtu &&
2719 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2720 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2721 }
2722 }
2723 return 0;
2724 }
2725
2726 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2727 {
2728 struct rt6_mtu_change_arg arg = {
2729 .dev = dev,
2730 .mtu = mtu,
2731 };
2732
2733 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2734 }
2735
2736 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2737 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2738 [RTA_OIF] = { .type = NLA_U32 },
2739 [RTA_IIF] = { .type = NLA_U32 },
2740 [RTA_PRIORITY] = { .type = NLA_U32 },
2741 [RTA_METRICS] = { .type = NLA_NESTED },
2742 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2743 [RTA_PREF] = { .type = NLA_U8 },
2744 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2745 [RTA_ENCAP] = { .type = NLA_NESTED },
2746 [RTA_EXPIRES] = { .type = NLA_U32 },
2747 };
2748
2749 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2750 struct fib6_config *cfg)
2751 {
2752 struct rtmsg *rtm;
2753 struct nlattr *tb[RTA_MAX+1];
2754 unsigned int pref;
2755 int err;
2756
2757 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2758 if (err < 0)
2759 goto errout;
2760
2761 err = -EINVAL;
2762 rtm = nlmsg_data(nlh);
2763 memset(cfg, 0, sizeof(*cfg));
2764
2765 cfg->fc_table = rtm->rtm_table;
2766 cfg->fc_dst_len = rtm->rtm_dst_len;
2767 cfg->fc_src_len = rtm->rtm_src_len;
2768 cfg->fc_flags = RTF_UP;
2769 cfg->fc_protocol = rtm->rtm_protocol;
2770 cfg->fc_type = rtm->rtm_type;
2771
2772 if (rtm->rtm_type == RTN_UNREACHABLE ||
2773 rtm->rtm_type == RTN_BLACKHOLE ||
2774 rtm->rtm_type == RTN_PROHIBIT ||
2775 rtm->rtm_type == RTN_THROW)
2776 cfg->fc_flags |= RTF_REJECT;
2777
2778 if (rtm->rtm_type == RTN_LOCAL)
2779 cfg->fc_flags |= RTF_LOCAL;
2780
2781 if (rtm->rtm_flags & RTM_F_CLONED)
2782 cfg->fc_flags |= RTF_CACHE;
2783
2784 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2785 cfg->fc_nlinfo.nlh = nlh;
2786 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2787
2788 if (tb[RTA_GATEWAY]) {
2789 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2790 cfg->fc_flags |= RTF_GATEWAY;
2791 }
2792
2793 if (tb[RTA_DST]) {
2794 int plen = (rtm->rtm_dst_len + 7) >> 3;
2795
2796 if (nla_len(tb[RTA_DST]) < plen)
2797 goto errout;
2798
2799 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2800 }
2801
2802 if (tb[RTA_SRC]) {
2803 int plen = (rtm->rtm_src_len + 7) >> 3;
2804
2805 if (nla_len(tb[RTA_SRC]) < plen)
2806 goto errout;
2807
2808 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2809 }
2810
2811 if (tb[RTA_PREFSRC])
2812 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2813
2814 if (tb[RTA_OIF])
2815 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2816
2817 if (tb[RTA_PRIORITY])
2818 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2819
2820 if (tb[RTA_METRICS]) {
2821 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2822 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2823 }
2824
2825 if (tb[RTA_TABLE])
2826 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2827
2828 if (tb[RTA_MULTIPATH]) {
2829 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2830 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2831 }
2832
2833 if (tb[RTA_PREF]) {
2834 pref = nla_get_u8(tb[RTA_PREF]);
2835 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2836 pref != ICMPV6_ROUTER_PREF_HIGH)
2837 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2838 cfg->fc_flags |= RTF_PREF(pref);
2839 }
2840
2841 if (tb[RTA_ENCAP])
2842 cfg->fc_encap = tb[RTA_ENCAP];
2843
2844 if (tb[RTA_ENCAP_TYPE])
2845 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2846
2847 if (tb[RTA_EXPIRES]) {
2848 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2849
2850 if (addrconf_finite_timeout(timeout)) {
2851 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2852 cfg->fc_flags |= RTF_EXPIRES;
2853 }
2854 }
2855
2856 err = 0;
2857 errout:
2858 return err;
2859 }
2860
2861 struct rt6_nh {
2862 struct rt6_info *rt6_info;
2863 struct fib6_config r_cfg;
2864 struct mx6_config mxc;
2865 struct list_head next;
2866 };
2867
2868 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2869 {
2870 struct rt6_nh *nh;
2871
2872 list_for_each_entry(nh, rt6_nh_list, next) {
2873 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2874 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2875 nh->r_cfg.fc_ifindex);
2876 }
2877 }
2878
2879 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2880 struct rt6_info *rt, struct fib6_config *r_cfg)
2881 {
2882 struct rt6_nh *nh;
2883 struct rt6_info *rtnh;
2884 int err = -EEXIST;
2885
2886 list_for_each_entry(nh, rt6_nh_list, next) {
2887 /* check if rt6_info already exists */
2888 rtnh = nh->rt6_info;
2889
2890 if (rtnh->dst.dev == rt->dst.dev &&
2891 rtnh->rt6i_idev == rt->rt6i_idev &&
2892 ipv6_addr_equal(&rtnh->rt6i_gateway,
2893 &rt->rt6i_gateway))
2894 return err;
2895 }
2896
2897 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2898 if (!nh)
2899 return -ENOMEM;
2900 nh->rt6_info = rt;
2901 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2902 if (err) {
2903 kfree(nh);
2904 return err;
2905 }
2906 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2907 list_add_tail(&nh->next, rt6_nh_list);
2908
2909 return 0;
2910 }
2911
2912 static int ip6_route_multipath_add(struct fib6_config *cfg)
2913 {
2914 struct fib6_config r_cfg;
2915 struct rtnexthop *rtnh;
2916 struct rt6_info *rt;
2917 struct rt6_nh *err_nh;
2918 struct rt6_nh *nh, *nh_safe;
2919 int remaining;
2920 int attrlen;
2921 int err = 1;
2922 int nhn = 0;
2923 int replace = (cfg->fc_nlinfo.nlh &&
2924 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2925 LIST_HEAD(rt6_nh_list);
2926
2927 remaining = cfg->fc_mp_len;
2928 rtnh = (struct rtnexthop *)cfg->fc_mp;
2929
2930 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2931 * rt6_info structs per nexthop
2932 */
2933 while (rtnh_ok(rtnh, remaining)) {
2934 memcpy(&r_cfg, cfg, sizeof(*cfg));
2935 if (rtnh->rtnh_ifindex)
2936 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2937
2938 attrlen = rtnh_attrlen(rtnh);
2939 if (attrlen > 0) {
2940 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2941
2942 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2943 if (nla) {
2944 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2945 r_cfg.fc_flags |= RTF_GATEWAY;
2946 }
2947 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2948 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2949 if (nla)
2950 r_cfg.fc_encap_type = nla_get_u16(nla);
2951 }
2952
2953 rt = ip6_route_info_create(&r_cfg);
2954 if (IS_ERR(rt)) {
2955 err = PTR_ERR(rt);
2956 rt = NULL;
2957 goto cleanup;
2958 }
2959
2960 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2961 if (err) {
2962 dst_free(&rt->dst);
2963 goto cleanup;
2964 }
2965
2966 rtnh = rtnh_next(rtnh, &remaining);
2967 }
2968
2969 err_nh = NULL;
2970 list_for_each_entry(nh, &rt6_nh_list, next) {
2971 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2972 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2973 nh->rt6_info = NULL;
2974 if (err) {
2975 if (replace && nhn)
2976 ip6_print_replace_route_err(&rt6_nh_list);
2977 err_nh = nh;
2978 goto add_errout;
2979 }
2980
2981 /* Because each route is added like a single route we remove
2982 * these flags after the first nexthop: if there is a collision,
2983 * we have already failed to add the first nexthop:
2984 * fib6_add_rt2node() has rejected it; when replacing, old
2985 * nexthops have been replaced by first new, the rest should
2986 * be added to it.
2987 */
2988 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2989 NLM_F_REPLACE);
2990 nhn++;
2991 }
2992
2993 goto cleanup;
2994
2995 add_errout:
2996 /* Delete routes that were already added */
2997 list_for_each_entry(nh, &rt6_nh_list, next) {
2998 if (err_nh == nh)
2999 break;
3000 ip6_route_del(&nh->r_cfg);
3001 }
3002
3003 cleanup:
3004 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3005 if (nh->rt6_info)
3006 dst_free(&nh->rt6_info->dst);
3007 kfree(nh->mxc.mx);
3008 list_del(&nh->next);
3009 kfree(nh);
3010 }
3011
3012 return err;
3013 }
3014
3015 static int ip6_route_multipath_del(struct fib6_config *cfg)
3016 {
3017 struct fib6_config r_cfg;
3018 struct rtnexthop *rtnh;
3019 int remaining;
3020 int attrlen;
3021 int err = 1, last_err = 0;
3022
3023 remaining = cfg->fc_mp_len;
3024 rtnh = (struct rtnexthop *)cfg->fc_mp;
3025
3026 /* Parse a Multipath Entry */
3027 while (rtnh_ok(rtnh, remaining)) {
3028 memcpy(&r_cfg, cfg, sizeof(*cfg));
3029 if (rtnh->rtnh_ifindex)
3030 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3031
3032 attrlen = rtnh_attrlen(rtnh);
3033 if (attrlen > 0) {
3034 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3035
3036 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3037 if (nla) {
3038 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3039 r_cfg.fc_flags |= RTF_GATEWAY;
3040 }
3041 }
3042 err = ip6_route_del(&r_cfg);
3043 if (err)
3044 last_err = err;
3045
3046 rtnh = rtnh_next(rtnh, &remaining);
3047 }
3048
3049 return last_err;
3050 }
3051
3052 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3053 {
3054 struct fib6_config cfg;
3055 int err;
3056
3057 err = rtm_to_fib6_config(skb, nlh, &cfg);
3058 if (err < 0)
3059 return err;
3060
3061 if (cfg.fc_mp)
3062 return ip6_route_multipath_del(&cfg);
3063 else
3064 return ip6_route_del(&cfg);
3065 }
3066
3067 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3068 {
3069 struct fib6_config cfg;
3070 int err;
3071
3072 err = rtm_to_fib6_config(skb, nlh, &cfg);
3073 if (err < 0)
3074 return err;
3075
3076 if (cfg.fc_mp)
3077 return ip6_route_multipath_add(&cfg);
3078 else
3079 return ip6_route_add(&cfg);
3080 }
3081
3082 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3083 {
3084 return NLMSG_ALIGN(sizeof(struct rtmsg))
3085 + nla_total_size(16) /* RTA_SRC */
3086 + nla_total_size(16) /* RTA_DST */
3087 + nla_total_size(16) /* RTA_GATEWAY */
3088 + nla_total_size(16) /* RTA_PREFSRC */
3089 + nla_total_size(4) /* RTA_TABLE */
3090 + nla_total_size(4) /* RTA_IIF */
3091 + nla_total_size(4) /* RTA_OIF */
3092 + nla_total_size(4) /* RTA_PRIORITY */
3093 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3094 + nla_total_size(sizeof(struct rta_cacheinfo))
3095 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3096 + nla_total_size(1) /* RTA_PREF */
3097 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3098 }
3099
3100 static int rt6_fill_node(struct net *net,
3101 struct sk_buff *skb, struct rt6_info *rt,
3102 struct in6_addr *dst, struct in6_addr *src,
3103 int iif, int type, u32 portid, u32 seq,
3104 int prefix, int nowait, unsigned int flags)
3105 {
3106 u32 metrics[RTAX_MAX];
3107 struct rtmsg *rtm;
3108 struct nlmsghdr *nlh;
3109 long expires;
3110 u32 table;
3111
3112 if (prefix) { /* user wants prefix routes only */
3113 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3114 /* success since this is not a prefix route */
3115 return 1;
3116 }
3117 }
3118
3119 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3120 if (!nlh)
3121 return -EMSGSIZE;
3122
3123 rtm = nlmsg_data(nlh);
3124 rtm->rtm_family = AF_INET6;
3125 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3126 rtm->rtm_src_len = rt->rt6i_src.plen;
3127 rtm->rtm_tos = 0;
3128 if (rt->rt6i_table)
3129 table = rt->rt6i_table->tb6_id;
3130 else
3131 table = RT6_TABLE_UNSPEC;
3132 rtm->rtm_table = table;
3133 if (nla_put_u32(skb, RTA_TABLE, table))
3134 goto nla_put_failure;
3135 if (rt->rt6i_flags & RTF_REJECT) {
3136 switch (rt->dst.error) {
3137 case -EINVAL:
3138 rtm->rtm_type = RTN_BLACKHOLE;
3139 break;
3140 case -EACCES:
3141 rtm->rtm_type = RTN_PROHIBIT;
3142 break;
3143 case -EAGAIN:
3144 rtm->rtm_type = RTN_THROW;
3145 break;
3146 default:
3147 rtm->rtm_type = RTN_UNREACHABLE;
3148 break;
3149 }
3150 }
3151 else if (rt->rt6i_flags & RTF_LOCAL)
3152 rtm->rtm_type = RTN_LOCAL;
3153 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3154 rtm->rtm_type = RTN_LOCAL;
3155 else
3156 rtm->rtm_type = RTN_UNICAST;
3157 rtm->rtm_flags = 0;
3158 if (!netif_carrier_ok(rt->dst.dev)) {
3159 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3160 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3161 rtm->rtm_flags |= RTNH_F_DEAD;
3162 }
3163 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3164 rtm->rtm_protocol = rt->rt6i_protocol;
3165 if (rt->rt6i_flags & RTF_DYNAMIC)
3166 rtm->rtm_protocol = RTPROT_REDIRECT;
3167 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3168 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3169 rtm->rtm_protocol = RTPROT_RA;
3170 else
3171 rtm->rtm_protocol = RTPROT_KERNEL;
3172 }
3173
3174 if (rt->rt6i_flags & RTF_CACHE)
3175 rtm->rtm_flags |= RTM_F_CLONED;
3176
3177 if (dst) {
3178 if (nla_put_in6_addr(skb, RTA_DST, dst))
3179 goto nla_put_failure;
3180 rtm->rtm_dst_len = 128;
3181 } else if (rtm->rtm_dst_len)
3182 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3183 goto nla_put_failure;
3184 #ifdef CONFIG_IPV6_SUBTREES
3185 if (src) {
3186 if (nla_put_in6_addr(skb, RTA_SRC, src))
3187 goto nla_put_failure;
3188 rtm->rtm_src_len = 128;
3189 } else if (rtm->rtm_src_len &&
3190 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3191 goto nla_put_failure;
3192 #endif
3193 if (iif) {
3194 #ifdef CONFIG_IPV6_MROUTE
3195 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3196 int err = ip6mr_get_route(net, skb, rtm, nowait);
3197 if (err <= 0) {
3198 if (!nowait) {
3199 if (err == 0)
3200 return 0;
3201 goto nla_put_failure;
3202 } else {
3203 if (err == -EMSGSIZE)
3204 goto nla_put_failure;
3205 }
3206 }
3207 } else
3208 #endif
3209 if (nla_put_u32(skb, RTA_IIF, iif))
3210 goto nla_put_failure;
3211 } else if (dst) {
3212 struct in6_addr saddr_buf;
3213 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3214 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3215 goto nla_put_failure;
3216 }
3217
3218 if (rt->rt6i_prefsrc.plen) {
3219 struct in6_addr saddr_buf;
3220 saddr_buf = rt->rt6i_prefsrc.addr;
3221 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3222 goto nla_put_failure;
3223 }
3224
3225 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3226 if (rt->rt6i_pmtu)
3227 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3228 if (rtnetlink_put_metrics(skb, metrics) < 0)
3229 goto nla_put_failure;
3230
3231 if (rt->rt6i_flags & RTF_GATEWAY) {
3232 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3233 goto nla_put_failure;
3234 }
3235
3236 if (rt->dst.dev &&
3237 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3238 goto nla_put_failure;
3239 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3240 goto nla_put_failure;
3241
3242 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3243
3244 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3245 goto nla_put_failure;
3246
3247 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3248 goto nla_put_failure;
3249
3250 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3251
3252 nlmsg_end(skb, nlh);
3253 return 0;
3254
3255 nla_put_failure:
3256 nlmsg_cancel(skb, nlh);
3257 return -EMSGSIZE;
3258 }
3259
3260 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3261 {
3262 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3263 int prefix;
3264
3265 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3266 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3267 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3268 } else
3269 prefix = 0;
3270
3271 return rt6_fill_node(arg->net,
3272 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3273 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3274 prefix, 0, NLM_F_MULTI);
3275 }
3276
3277 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3278 {
3279 struct net *net = sock_net(in_skb->sk);
3280 struct nlattr *tb[RTA_MAX+1];
3281 struct rt6_info *rt;
3282 struct sk_buff *skb;
3283 struct rtmsg *rtm;
3284 struct flowi6 fl6;
3285 int err, iif = 0, oif = 0;
3286
3287 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3288 if (err < 0)
3289 goto errout;
3290
3291 err = -EINVAL;
3292 memset(&fl6, 0, sizeof(fl6));
3293 rtm = nlmsg_data(nlh);
3294 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
3295
3296 if (tb[RTA_SRC]) {
3297 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3298 goto errout;
3299
3300 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3301 }
3302
3303 if (tb[RTA_DST]) {
3304 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3305 goto errout;
3306
3307 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3308 }
3309
3310 if (tb[RTA_IIF])
3311 iif = nla_get_u32(tb[RTA_IIF]);
3312
3313 if (tb[RTA_OIF])
3314 oif = nla_get_u32(tb[RTA_OIF]);
3315
3316 if (tb[RTA_MARK])
3317 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3318
3319 if (iif) {
3320 struct net_device *dev;
3321 int flags = 0;
3322
3323 dev = __dev_get_by_index(net, iif);
3324 if (!dev) {
3325 err = -ENODEV;
3326 goto errout;
3327 }
3328
3329 fl6.flowi6_iif = iif;
3330
3331 if (!ipv6_addr_any(&fl6.saddr))
3332 flags |= RT6_LOOKUP_F_HAS_SADDR;
3333
3334 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3335 flags);
3336 } else {
3337 fl6.flowi6_oif = oif;
3338
3339 if (netif_index_is_l3_master(net, oif)) {
3340 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3341 FLOWI_FLAG_SKIP_NH_OIF;
3342 }
3343
3344 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3345 }
3346
3347 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3348 if (!skb) {
3349 ip6_rt_put(rt);
3350 err = -ENOBUFS;
3351 goto errout;
3352 }
3353
3354 /* Reserve room for dummy headers, this skb can pass
3355 through good chunk of routing engine.
3356 */
3357 skb_reset_mac_header(skb);
3358 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3359
3360 skb_dst_set(skb, &rt->dst);
3361
3362 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3363 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3364 nlh->nlmsg_seq, 0, 0, 0);
3365 if (err < 0) {
3366 kfree_skb(skb);
3367 goto errout;
3368 }
3369
3370 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3371 errout:
3372 return err;
3373 }
3374
3375 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3376 unsigned int nlm_flags)
3377 {
3378 struct sk_buff *skb;
3379 struct net *net = info->nl_net;
3380 u32 seq;
3381 int err;
3382
3383 err = -ENOBUFS;
3384 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3385
3386 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3387 if (!skb)
3388 goto errout;
3389
3390 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3391 event, info->portid, seq, 0, 0, nlm_flags);
3392 if (err < 0) {
3393 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3394 WARN_ON(err == -EMSGSIZE);
3395 kfree_skb(skb);
3396 goto errout;
3397 }
3398 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3399 info->nlh, gfp_any());
3400 return;
3401 errout:
3402 if (err < 0)
3403 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3404 }
3405
3406 static int ip6_route_dev_notify(struct notifier_block *this,
3407 unsigned long event, void *ptr)
3408 {
3409 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3410 struct net *net = dev_net(dev);
3411
3412 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3413 net->ipv6.ip6_null_entry->dst.dev = dev;
3414 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3415 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3416 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3417 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3418 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3419 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3420 #endif
3421 }
3422
3423 return NOTIFY_OK;
3424 }
3425
3426 /*
3427 * /proc
3428 */
3429
3430 #ifdef CONFIG_PROC_FS
3431
3432 static const struct file_operations ipv6_route_proc_fops = {
3433 .owner = THIS_MODULE,
3434 .open = ipv6_route_open,
3435 .read = seq_read,
3436 .llseek = seq_lseek,
3437 .release = seq_release_net,
3438 };
3439
3440 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3441 {
3442 struct net *net = (struct net *)seq->private;
3443 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3444 net->ipv6.rt6_stats->fib_nodes,
3445 net->ipv6.rt6_stats->fib_route_nodes,
3446 net->ipv6.rt6_stats->fib_rt_alloc,
3447 net->ipv6.rt6_stats->fib_rt_entries,
3448 net->ipv6.rt6_stats->fib_rt_cache,
3449 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3450 net->ipv6.rt6_stats->fib_discarded_routes);
3451
3452 return 0;
3453 }
3454
3455 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3456 {
3457 return single_open_net(inode, file, rt6_stats_seq_show);
3458 }
3459
3460 static const struct file_operations rt6_stats_seq_fops = {
3461 .owner = THIS_MODULE,
3462 .open = rt6_stats_seq_open,
3463 .read = seq_read,
3464 .llseek = seq_lseek,
3465 .release = single_release_net,
3466 };
3467 #endif /* CONFIG_PROC_FS */
3468
3469 #ifdef CONFIG_SYSCTL
3470
3471 static
3472 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3473 void __user *buffer, size_t *lenp, loff_t *ppos)
3474 {
3475 struct net *net;
3476 int delay;
3477 if (!write)
3478 return -EINVAL;
3479
3480 net = (struct net *)ctl->extra1;
3481 delay = net->ipv6.sysctl.flush_delay;
3482 proc_dointvec(ctl, write, buffer, lenp, ppos);
3483 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3484 return 0;
3485 }
3486
3487 struct ctl_table ipv6_route_table_template[] = {
3488 {
3489 .procname = "flush",
3490 .data = &init_net.ipv6.sysctl.flush_delay,
3491 .maxlen = sizeof(int),
3492 .mode = 0200,
3493 .proc_handler = ipv6_sysctl_rtcache_flush
3494 },
3495 {
3496 .procname = "gc_thresh",
3497 .data = &ip6_dst_ops_template.gc_thresh,
3498 .maxlen = sizeof(int),
3499 .mode = 0644,
3500 .proc_handler = proc_dointvec,
3501 },
3502 {
3503 .procname = "max_size",
3504 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3505 .maxlen = sizeof(int),
3506 .mode = 0644,
3507 .proc_handler = proc_dointvec,
3508 },
3509 {
3510 .procname = "gc_min_interval",
3511 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3512 .maxlen = sizeof(int),
3513 .mode = 0644,
3514 .proc_handler = proc_dointvec_jiffies,
3515 },
3516 {
3517 .procname = "gc_timeout",
3518 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3519 .maxlen = sizeof(int),
3520 .mode = 0644,
3521 .proc_handler = proc_dointvec_jiffies,
3522 },
3523 {
3524 .procname = "gc_interval",
3525 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3526 .maxlen = sizeof(int),
3527 .mode = 0644,
3528 .proc_handler = proc_dointvec_jiffies,
3529 },
3530 {
3531 .procname = "gc_elasticity",
3532 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3533 .maxlen = sizeof(int),
3534 .mode = 0644,
3535 .proc_handler = proc_dointvec,
3536 },
3537 {
3538 .procname = "mtu_expires",
3539 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3540 .maxlen = sizeof(int),
3541 .mode = 0644,
3542 .proc_handler = proc_dointvec_jiffies,
3543 },
3544 {
3545 .procname = "min_adv_mss",
3546 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3547 .maxlen = sizeof(int),
3548 .mode = 0644,
3549 .proc_handler = proc_dointvec,
3550 },
3551 {
3552 .procname = "gc_min_interval_ms",
3553 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3554 .maxlen = sizeof(int),
3555 .mode = 0644,
3556 .proc_handler = proc_dointvec_ms_jiffies,
3557 },
3558 { }
3559 };
3560
3561 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3562 {
3563 struct ctl_table *table;
3564
3565 table = kmemdup(ipv6_route_table_template,
3566 sizeof(ipv6_route_table_template),
3567 GFP_KERNEL);
3568
3569 if (table) {
3570 table[0].data = &net->ipv6.sysctl.flush_delay;
3571 table[0].extra1 = net;
3572 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3573 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3574 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3575 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3576 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3577 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3578 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3579 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3580 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3581
3582 /* Don't export sysctls to unprivileged users */
3583 if (net->user_ns != &init_user_ns)
3584 table[0].procname = NULL;
3585 }
3586
3587 return table;
3588 }
3589 #endif
3590
3591 static int __net_init ip6_route_net_init(struct net *net)
3592 {
3593 int ret = -ENOMEM;
3594
3595 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3596 sizeof(net->ipv6.ip6_dst_ops));
3597
3598 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3599 goto out_ip6_dst_ops;
3600
3601 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3602 sizeof(*net->ipv6.ip6_null_entry),
3603 GFP_KERNEL);
3604 if (!net->ipv6.ip6_null_entry)
3605 goto out_ip6_dst_entries;
3606 net->ipv6.ip6_null_entry->dst.path =
3607 (struct dst_entry *)net->ipv6.ip6_null_entry;
3608 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3609 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3610 ip6_template_metrics, true);
3611
3612 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3613 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3614 sizeof(*net->ipv6.ip6_prohibit_entry),
3615 GFP_KERNEL);
3616 if (!net->ipv6.ip6_prohibit_entry)
3617 goto out_ip6_null_entry;
3618 net->ipv6.ip6_prohibit_entry->dst.path =
3619 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3620 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3621 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3622 ip6_template_metrics, true);
3623
3624 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3625 sizeof(*net->ipv6.ip6_blk_hole_entry),
3626 GFP_KERNEL);
3627 if (!net->ipv6.ip6_blk_hole_entry)
3628 goto out_ip6_prohibit_entry;
3629 net->ipv6.ip6_blk_hole_entry->dst.path =
3630 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3631 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3632 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3633 ip6_template_metrics, true);
3634 #endif
3635
3636 net->ipv6.sysctl.flush_delay = 0;
3637 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3638 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3639 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3640 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3641 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3642 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3643 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3644
3645 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3646
3647 ret = 0;
3648 out:
3649 return ret;
3650
3651 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3652 out_ip6_prohibit_entry:
3653 kfree(net->ipv6.ip6_prohibit_entry);
3654 out_ip6_null_entry:
3655 kfree(net->ipv6.ip6_null_entry);
3656 #endif
3657 out_ip6_dst_entries:
3658 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3659 out_ip6_dst_ops:
3660 goto out;
3661 }
3662
3663 static void __net_exit ip6_route_net_exit(struct net *net)
3664 {
3665 kfree(net->ipv6.ip6_null_entry);
3666 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3667 kfree(net->ipv6.ip6_prohibit_entry);
3668 kfree(net->ipv6.ip6_blk_hole_entry);
3669 #endif
3670 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3671 }
3672
3673 static int __net_init ip6_route_net_init_late(struct net *net)
3674 {
3675 #ifdef CONFIG_PROC_FS
3676 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3677 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3678 #endif
3679 return 0;
3680 }
3681
3682 static void __net_exit ip6_route_net_exit_late(struct net *net)
3683 {
3684 #ifdef CONFIG_PROC_FS
3685 remove_proc_entry("ipv6_route", net->proc_net);
3686 remove_proc_entry("rt6_stats", net->proc_net);
3687 #endif
3688 }
3689
3690 static struct pernet_operations ip6_route_net_ops = {
3691 .init = ip6_route_net_init,
3692 .exit = ip6_route_net_exit,
3693 };
3694
3695 static int __net_init ipv6_inetpeer_init(struct net *net)
3696 {
3697 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3698
3699 if (!bp)
3700 return -ENOMEM;
3701 inet_peer_base_init(bp);
3702 net->ipv6.peers = bp;
3703 return 0;
3704 }
3705
3706 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3707 {
3708 struct inet_peer_base *bp = net->ipv6.peers;
3709
3710 net->ipv6.peers = NULL;
3711 inetpeer_invalidate_tree(bp);
3712 kfree(bp);
3713 }
3714
3715 static struct pernet_operations ipv6_inetpeer_ops = {
3716 .init = ipv6_inetpeer_init,
3717 .exit = ipv6_inetpeer_exit,
3718 };
3719
3720 static struct pernet_operations ip6_route_net_late_ops = {
3721 .init = ip6_route_net_init_late,
3722 .exit = ip6_route_net_exit_late,
3723 };
3724
3725 static struct notifier_block ip6_route_dev_notifier = {
3726 .notifier_call = ip6_route_dev_notify,
3727 .priority = 0,
3728 };
3729
3730 int __init ip6_route_init(void)
3731 {
3732 int ret;
3733 int cpu;
3734
3735 ret = -ENOMEM;
3736 ip6_dst_ops_template.kmem_cachep =
3737 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3738 SLAB_HWCACHE_ALIGN, NULL);
3739 if (!ip6_dst_ops_template.kmem_cachep)
3740 goto out;
3741
3742 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3743 if (ret)
3744 goto out_kmem_cache;
3745
3746 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3747 if (ret)
3748 goto out_dst_entries;
3749
3750 ret = register_pernet_subsys(&ip6_route_net_ops);
3751 if (ret)
3752 goto out_register_inetpeer;
3753
3754 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3755
3756 /* Registering of the loopback is done before this portion of code,
3757 * the loopback reference in rt6_info will not be taken, do it
3758 * manually for init_net */
3759 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3760 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3761 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3762 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3763 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3764 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3765 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3766 #endif
3767 ret = fib6_init();
3768 if (ret)
3769 goto out_register_subsys;
3770
3771 ret = xfrm6_init();
3772 if (ret)
3773 goto out_fib6_init;
3774
3775 ret = fib6_rules_init();
3776 if (ret)
3777 goto xfrm6_init;
3778
3779 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3780 if (ret)
3781 goto fib6_rules_init;
3782
3783 ret = -ENOBUFS;
3784 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3785 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3786 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3787 goto out_register_late_subsys;
3788
3789 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3790 if (ret)
3791 goto out_register_late_subsys;
3792
3793 for_each_possible_cpu(cpu) {
3794 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3795
3796 INIT_LIST_HEAD(&ul->head);
3797 spin_lock_init(&ul->lock);
3798 }
3799
3800 out:
3801 return ret;
3802
3803 out_register_late_subsys:
3804 unregister_pernet_subsys(&ip6_route_net_late_ops);
3805 fib6_rules_init:
3806 fib6_rules_cleanup();
3807 xfrm6_init:
3808 xfrm6_fini();
3809 out_fib6_init:
3810 fib6_gc_cleanup();
3811 out_register_subsys:
3812 unregister_pernet_subsys(&ip6_route_net_ops);
3813 out_register_inetpeer:
3814 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3815 out_dst_entries:
3816 dst_entries_destroy(&ip6_dst_blackhole_ops);
3817 out_kmem_cache:
3818 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3819 goto out;
3820 }
3821
3822 void ip6_route_cleanup(void)
3823 {
3824 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3825 unregister_pernet_subsys(&ip6_route_net_late_ops);
3826 fib6_rules_cleanup();
3827 xfrm6_fini();
3828 fib6_gc_cleanup();
3829 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3830 unregister_pernet_subsys(&ip6_route_net_ops);
3831 dst_entries_destroy(&ip6_dst_blackhole_ops);
3832 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3833 }
(deprecated) Btrfs devel tree