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proc: prevent accessing /proc/<PID>/environ until it's ready
[deliverable/linux.git] / net / ipv6 / route.c
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/dst_metadata.h>
58 #include <net/xfrm.h>
59 #include <net/netevent.h>
60 #include <net/netlink.h>
61 #include <net/nexthop.h>
62 #include <net/lwtunnel.h>
63 #include <net/ip_tunnels.h>
64 #include <net/l3mdev.h>
65 #include <trace/events/fib6.h>
66
67 #include <asm/uaccess.h>
68
69 #ifdef CONFIG_SYSCTL
70 #include <linux/sysctl.h>
71 #endif
72
73 enum rt6_nud_state {
74 RT6_NUD_FAIL_HARD = -3,
75 RT6_NUD_FAIL_PROBE = -2,
76 RT6_NUD_FAIL_DO_RR = -1,
77 RT6_NUD_SUCCEED = 1
78 };
79
80 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
81 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
82 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
83 static unsigned int ip6_mtu(const struct dst_entry *dst);
84 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
85 static void ip6_dst_destroy(struct dst_entry *);
86 static void ip6_dst_ifdown(struct dst_entry *,
87 struct net_device *dev, int how);
88 static int ip6_dst_gc(struct dst_ops *ops);
89
90 static int ip6_pkt_discard(struct sk_buff *skb);
91 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
92 static int ip6_pkt_prohibit(struct sk_buff *skb);
93 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
94 static void ip6_link_failure(struct sk_buff *skb);
95 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb, u32 mtu);
97 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb);
99 static void rt6_dst_from_metrics_check(struct rt6_info *rt);
100 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
101
102 #ifdef CONFIG_IPV6_ROUTE_INFO
103 static struct rt6_info *rt6_add_route_info(struct net *net,
104 const struct in6_addr *prefix, int prefixlen,
105 const struct in6_addr *gwaddr, int ifindex,
106 unsigned int pref);
107 static struct rt6_info *rt6_get_route_info(struct net *net,
108 const struct in6_addr *prefix, int prefixlen,
109 const struct in6_addr *gwaddr, int ifindex);
110 #endif
111
112 struct uncached_list {
113 spinlock_t lock;
114 struct list_head head;
115 };
116
117 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
118
119 static void rt6_uncached_list_add(struct rt6_info *rt)
120 {
121 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
122
123 rt->dst.flags |= DST_NOCACHE;
124 rt->rt6i_uncached_list = ul;
125
126 spin_lock_bh(&ul->lock);
127 list_add_tail(&rt->rt6i_uncached, &ul->head);
128 spin_unlock_bh(&ul->lock);
129 }
130
131 static void rt6_uncached_list_del(struct rt6_info *rt)
132 {
133 if (!list_empty(&rt->rt6i_uncached)) {
134 struct uncached_list *ul = rt->rt6i_uncached_list;
135
136 spin_lock_bh(&ul->lock);
137 list_del(&rt->rt6i_uncached);
138 spin_unlock_bh(&ul->lock);
139 }
140 }
141
142 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
143 {
144 struct net_device *loopback_dev = net->loopback_dev;
145 int cpu;
146
147 if (dev == loopback_dev)
148 return;
149
150 for_each_possible_cpu(cpu) {
151 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
152 struct rt6_info *rt;
153
154 spin_lock_bh(&ul->lock);
155 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
156 struct inet6_dev *rt_idev = rt->rt6i_idev;
157 struct net_device *rt_dev = rt->dst.dev;
158
159 if (rt_idev->dev == dev) {
160 rt->rt6i_idev = in6_dev_get(loopback_dev);
161 in6_dev_put(rt_idev);
162 }
163
164 if (rt_dev == dev) {
165 rt->dst.dev = loopback_dev;
166 dev_hold(rt->dst.dev);
167 dev_put(rt_dev);
168 }
169 }
170 spin_unlock_bh(&ul->lock);
171 }
172 }
173
174 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
175 {
176 return dst_metrics_write_ptr(rt->dst.from);
177 }
178
179 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
180 {
181 struct rt6_info *rt = (struct rt6_info *)dst;
182
183 if (rt->rt6i_flags & RTF_PCPU)
184 return rt6_pcpu_cow_metrics(rt);
185 else if (rt->rt6i_flags & RTF_CACHE)
186 return NULL;
187 else
188 return dst_cow_metrics_generic(dst, old);
189 }
190
191 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
192 struct sk_buff *skb,
193 const void *daddr)
194 {
195 struct in6_addr *p = &rt->rt6i_gateway;
196
197 if (!ipv6_addr_any(p))
198 return (const void *) p;
199 else if (skb)
200 return &ipv6_hdr(skb)->daddr;
201 return daddr;
202 }
203
204 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
205 struct sk_buff *skb,
206 const void *daddr)
207 {
208 struct rt6_info *rt = (struct rt6_info *) dst;
209 struct neighbour *n;
210
211 daddr = choose_neigh_daddr(rt, skb, daddr);
212 n = __ipv6_neigh_lookup(dst->dev, daddr);
213 if (n)
214 return n;
215 return neigh_create(&nd_tbl, daddr, dst->dev);
216 }
217
218 static struct dst_ops ip6_dst_ops_template = {
219 .family = AF_INET6,
220 .gc = ip6_dst_gc,
221 .gc_thresh = 1024,
222 .check = ip6_dst_check,
223 .default_advmss = ip6_default_advmss,
224 .mtu = ip6_mtu,
225 .cow_metrics = ipv6_cow_metrics,
226 .destroy = ip6_dst_destroy,
227 .ifdown = ip6_dst_ifdown,
228 .negative_advice = ip6_negative_advice,
229 .link_failure = ip6_link_failure,
230 .update_pmtu = ip6_rt_update_pmtu,
231 .redirect = rt6_do_redirect,
232 .local_out = __ip6_local_out,
233 .neigh_lookup = ip6_neigh_lookup,
234 };
235
236 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
237 {
238 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
239
240 return mtu ? : dst->dev->mtu;
241 }
242
243 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
244 struct sk_buff *skb, u32 mtu)
245 {
246 }
247
248 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
249 struct sk_buff *skb)
250 {
251 }
252
253 static struct dst_ops ip6_dst_blackhole_ops = {
254 .family = AF_INET6,
255 .destroy = ip6_dst_destroy,
256 .check = ip6_dst_check,
257 .mtu = ip6_blackhole_mtu,
258 .default_advmss = ip6_default_advmss,
259 .update_pmtu = ip6_rt_blackhole_update_pmtu,
260 .redirect = ip6_rt_blackhole_redirect,
261 .cow_metrics = dst_cow_metrics_generic,
262 .neigh_lookup = ip6_neigh_lookup,
263 };
264
265 static const u32 ip6_template_metrics[RTAX_MAX] = {
266 [RTAX_HOPLIMIT - 1] = 0,
267 };
268
269 static const struct rt6_info ip6_null_entry_template = {
270 .dst = {
271 .__refcnt = ATOMIC_INIT(1),
272 .__use = 1,
273 .obsolete = DST_OBSOLETE_FORCE_CHK,
274 .error = -ENETUNREACH,
275 .input = ip6_pkt_discard,
276 .output = ip6_pkt_discard_out,
277 },
278 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
279 .rt6i_protocol = RTPROT_KERNEL,
280 .rt6i_metric = ~(u32) 0,
281 .rt6i_ref = ATOMIC_INIT(1),
282 };
283
284 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
285
286 static const struct rt6_info ip6_prohibit_entry_template = {
287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
290 .obsolete = DST_OBSOLETE_FORCE_CHK,
291 .error = -EACCES,
292 .input = ip6_pkt_prohibit,
293 .output = ip6_pkt_prohibit_out,
294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
296 .rt6i_protocol = RTPROT_KERNEL,
297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299 };
300
301 static const struct rt6_info ip6_blk_hole_entry_template = {
302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
305 .obsolete = DST_OBSOLETE_FORCE_CHK,
306 .error = -EINVAL,
307 .input = dst_discard,
308 .output = dst_discard_out,
309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
311 .rt6i_protocol = RTPROT_KERNEL,
312 .rt6i_metric = ~(u32) 0,
313 .rt6i_ref = ATOMIC_INIT(1),
314 };
315
316 #endif
317
318 static void rt6_info_init(struct rt6_info *rt)
319 {
320 struct dst_entry *dst = &rt->dst;
321
322 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
323 INIT_LIST_HEAD(&rt->rt6i_siblings);
324 INIT_LIST_HEAD(&rt->rt6i_uncached);
325 }
326
327 /* allocate dst with ip6_dst_ops */
328 static struct rt6_info *__ip6_dst_alloc(struct net *net,
329 struct net_device *dev,
330 int flags)
331 {
332 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
333 0, DST_OBSOLETE_FORCE_CHK, flags);
334
335 if (rt)
336 rt6_info_init(rt);
337
338 return rt;
339 }
340
341 struct rt6_info *ip6_dst_alloc(struct net *net,
342 struct net_device *dev,
343 int flags)
344 {
345 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
346
347 if (rt) {
348 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
349 if (rt->rt6i_pcpu) {
350 int cpu;
351
352 for_each_possible_cpu(cpu) {
353 struct rt6_info **p;
354
355 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
356 /* no one shares rt */
357 *p = NULL;
358 }
359 } else {
360 dst_destroy((struct dst_entry *)rt);
361 return NULL;
362 }
363 }
364
365 return rt;
366 }
367 EXPORT_SYMBOL(ip6_dst_alloc);
368
369 static void ip6_dst_destroy(struct dst_entry *dst)
370 {
371 struct rt6_info *rt = (struct rt6_info *)dst;
372 struct dst_entry *from = dst->from;
373 struct inet6_dev *idev;
374
375 dst_destroy_metrics_generic(dst);
376 free_percpu(rt->rt6i_pcpu);
377 rt6_uncached_list_del(rt);
378
379 idev = rt->rt6i_idev;
380 if (idev) {
381 rt->rt6i_idev = NULL;
382 in6_dev_put(idev);
383 }
384
385 dst->from = NULL;
386 dst_release(from);
387 }
388
389 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
390 int how)
391 {
392 struct rt6_info *rt = (struct rt6_info *)dst;
393 struct inet6_dev *idev = rt->rt6i_idev;
394 struct net_device *loopback_dev =
395 dev_net(dev)->loopback_dev;
396
397 if (dev != loopback_dev) {
398 if (idev && idev->dev == dev) {
399 struct inet6_dev *loopback_idev =
400 in6_dev_get(loopback_dev);
401 if (loopback_idev) {
402 rt->rt6i_idev = loopback_idev;
403 in6_dev_put(idev);
404 }
405 }
406 }
407 }
408
409 static bool __rt6_check_expired(const struct rt6_info *rt)
410 {
411 if (rt->rt6i_flags & RTF_EXPIRES)
412 return time_after(jiffies, rt->dst.expires);
413 else
414 return false;
415 }
416
417 static bool rt6_check_expired(const struct rt6_info *rt)
418 {
419 if (rt->rt6i_flags & RTF_EXPIRES) {
420 if (time_after(jiffies, rt->dst.expires))
421 return true;
422 } else if (rt->dst.from) {
423 return rt6_check_expired((struct rt6_info *) rt->dst.from);
424 }
425 return false;
426 }
427
428 /* Multipath route selection:
429 * Hash based function using packet header and flowlabel.
430 * Adapted from fib_info_hashfn()
431 */
432 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
433 const struct flowi6 *fl6)
434 {
435 return get_hash_from_flowi6(fl6) % candidate_count;
436 }
437
438 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
439 struct flowi6 *fl6, int oif,
440 int strict)
441 {
442 struct rt6_info *sibling, *next_sibling;
443 int route_choosen;
444
445 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
446 /* Don't change the route, if route_choosen == 0
447 * (siblings does not include ourself)
448 */
449 if (route_choosen)
450 list_for_each_entry_safe(sibling, next_sibling,
451 &match->rt6i_siblings, rt6i_siblings) {
452 route_choosen--;
453 if (route_choosen == 0) {
454 if (rt6_score_route(sibling, oif, strict) < 0)
455 break;
456 match = sibling;
457 break;
458 }
459 }
460 return match;
461 }
462
463 /*
464 * Route lookup. Any table->tb6_lock is implied.
465 */
466
467 static inline struct rt6_info *rt6_device_match(struct net *net,
468 struct rt6_info *rt,
469 const struct in6_addr *saddr,
470 int oif,
471 int flags)
472 {
473 struct rt6_info *local = NULL;
474 struct rt6_info *sprt;
475
476 if (!oif && ipv6_addr_any(saddr))
477 goto out;
478
479 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
480 struct net_device *dev = sprt->dst.dev;
481
482 if (oif) {
483 if (dev->ifindex == oif)
484 return sprt;
485 if (dev->flags & IFF_LOOPBACK) {
486 if (!sprt->rt6i_idev ||
487 sprt->rt6i_idev->dev->ifindex != oif) {
488 if (flags & RT6_LOOKUP_F_IFACE)
489 continue;
490 if (local &&
491 local->rt6i_idev->dev->ifindex == oif)
492 continue;
493 }
494 local = sprt;
495 }
496 } else {
497 if (ipv6_chk_addr(net, saddr, dev,
498 flags & RT6_LOOKUP_F_IFACE))
499 return sprt;
500 }
501 }
502
503 if (oif) {
504 if (local)
505 return local;
506
507 if (flags & RT6_LOOKUP_F_IFACE)
508 return net->ipv6.ip6_null_entry;
509 }
510 out:
511 return rt;
512 }
513
514 #ifdef CONFIG_IPV6_ROUTER_PREF
515 struct __rt6_probe_work {
516 struct work_struct work;
517 struct in6_addr target;
518 struct net_device *dev;
519 };
520
521 static void rt6_probe_deferred(struct work_struct *w)
522 {
523 struct in6_addr mcaddr;
524 struct __rt6_probe_work *work =
525 container_of(w, struct __rt6_probe_work, work);
526
527 addrconf_addr_solict_mult(&work->target, &mcaddr);
528 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
529 dev_put(work->dev);
530 kfree(work);
531 }
532
533 static void rt6_probe(struct rt6_info *rt)
534 {
535 struct __rt6_probe_work *work;
536 struct neighbour *neigh;
537 /*
538 * Okay, this does not seem to be appropriate
539 * for now, however, we need to check if it
540 * is really so; aka Router Reachability Probing.
541 *
542 * Router Reachability Probe MUST be rate-limited
543 * to no more than one per minute.
544 */
545 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
546 return;
547 rcu_read_lock_bh();
548 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
549 if (neigh) {
550 if (neigh->nud_state & NUD_VALID)
551 goto out;
552
553 work = NULL;
554 write_lock(&neigh->lock);
555 if (!(neigh->nud_state & NUD_VALID) &&
556 time_after(jiffies,
557 neigh->updated +
558 rt->rt6i_idev->cnf.rtr_probe_interval)) {
559 work = kmalloc(sizeof(*work), GFP_ATOMIC);
560 if (work)
561 __neigh_set_probe_once(neigh);
562 }
563 write_unlock(&neigh->lock);
564 } else {
565 work = kmalloc(sizeof(*work), GFP_ATOMIC);
566 }
567
568 if (work) {
569 INIT_WORK(&work->work, rt6_probe_deferred);
570 work->target = rt->rt6i_gateway;
571 dev_hold(rt->dst.dev);
572 work->dev = rt->dst.dev;
573 schedule_work(&work->work);
574 }
575
576 out:
577 rcu_read_unlock_bh();
578 }
579 #else
580 static inline void rt6_probe(struct rt6_info *rt)
581 {
582 }
583 #endif
584
585 /*
586 * Default Router Selection (RFC 2461 6.3.6)
587 */
588 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
589 {
590 struct net_device *dev = rt->dst.dev;
591 if (!oif || dev->ifindex == oif)
592 return 2;
593 if ((dev->flags & IFF_LOOPBACK) &&
594 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
595 return 1;
596 return 0;
597 }
598
599 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
600 {
601 struct neighbour *neigh;
602 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
603
604 if (rt->rt6i_flags & RTF_NONEXTHOP ||
605 !(rt->rt6i_flags & RTF_GATEWAY))
606 return RT6_NUD_SUCCEED;
607
608 rcu_read_lock_bh();
609 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
610 if (neigh) {
611 read_lock(&neigh->lock);
612 if (neigh->nud_state & NUD_VALID)
613 ret = RT6_NUD_SUCCEED;
614 #ifdef CONFIG_IPV6_ROUTER_PREF
615 else if (!(neigh->nud_state & NUD_FAILED))
616 ret = RT6_NUD_SUCCEED;
617 else
618 ret = RT6_NUD_FAIL_PROBE;
619 #endif
620 read_unlock(&neigh->lock);
621 } else {
622 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
623 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
624 }
625 rcu_read_unlock_bh();
626
627 return ret;
628 }
629
630 static int rt6_score_route(struct rt6_info *rt, int oif,
631 int strict)
632 {
633 int m;
634
635 m = rt6_check_dev(rt, oif);
636 if (!m && (strict & RT6_LOOKUP_F_IFACE))
637 return RT6_NUD_FAIL_HARD;
638 #ifdef CONFIG_IPV6_ROUTER_PREF
639 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
640 #endif
641 if (strict & RT6_LOOKUP_F_REACHABLE) {
642 int n = rt6_check_neigh(rt);
643 if (n < 0)
644 return n;
645 }
646 return m;
647 }
648
649 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
650 int *mpri, struct rt6_info *match,
651 bool *do_rr)
652 {
653 int m;
654 bool match_do_rr = false;
655 struct inet6_dev *idev = rt->rt6i_idev;
656 struct net_device *dev = rt->dst.dev;
657
658 if (dev && !netif_carrier_ok(dev) &&
659 idev->cnf.ignore_routes_with_linkdown)
660 goto out;
661
662 if (rt6_check_expired(rt))
663 goto out;
664
665 m = rt6_score_route(rt, oif, strict);
666 if (m == RT6_NUD_FAIL_DO_RR) {
667 match_do_rr = true;
668 m = 0; /* lowest valid score */
669 } else if (m == RT6_NUD_FAIL_HARD) {
670 goto out;
671 }
672
673 if (strict & RT6_LOOKUP_F_REACHABLE)
674 rt6_probe(rt);
675
676 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
677 if (m > *mpri) {
678 *do_rr = match_do_rr;
679 *mpri = m;
680 match = rt;
681 }
682 out:
683 return match;
684 }
685
686 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
687 struct rt6_info *rr_head,
688 u32 metric, int oif, int strict,
689 bool *do_rr)
690 {
691 struct rt6_info *rt, *match, *cont;
692 int mpri = -1;
693
694 match = NULL;
695 cont = NULL;
696 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
697 if (rt->rt6i_metric != metric) {
698 cont = rt;
699 break;
700 }
701
702 match = find_match(rt, oif, strict, &mpri, match, do_rr);
703 }
704
705 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
706 if (rt->rt6i_metric != metric) {
707 cont = rt;
708 break;
709 }
710
711 match = find_match(rt, oif, strict, &mpri, match, do_rr);
712 }
713
714 if (match || !cont)
715 return match;
716
717 for (rt = cont; rt; rt = rt->dst.rt6_next)
718 match = find_match(rt, oif, strict, &mpri, match, do_rr);
719
720 return match;
721 }
722
723 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
724 {
725 struct rt6_info *match, *rt0;
726 struct net *net;
727 bool do_rr = false;
728
729 rt0 = fn->rr_ptr;
730 if (!rt0)
731 fn->rr_ptr = rt0 = fn->leaf;
732
733 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
734 &do_rr);
735
736 if (do_rr) {
737 struct rt6_info *next = rt0->dst.rt6_next;
738
739 /* no entries matched; do round-robin */
740 if (!next || next->rt6i_metric != rt0->rt6i_metric)
741 next = fn->leaf;
742
743 if (next != rt0)
744 fn->rr_ptr = next;
745 }
746
747 net = dev_net(rt0->dst.dev);
748 return match ? match : net->ipv6.ip6_null_entry;
749 }
750
751 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
752 {
753 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
754 }
755
756 #ifdef CONFIG_IPV6_ROUTE_INFO
757 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
758 const struct in6_addr *gwaddr)
759 {
760 struct net *net = dev_net(dev);
761 struct route_info *rinfo = (struct route_info *) opt;
762 struct in6_addr prefix_buf, *prefix;
763 unsigned int pref;
764 unsigned long lifetime;
765 struct rt6_info *rt;
766
767 if (len < sizeof(struct route_info)) {
768 return -EINVAL;
769 }
770
771 /* Sanity check for prefix_len and length */
772 if (rinfo->length > 3) {
773 return -EINVAL;
774 } else if (rinfo->prefix_len > 128) {
775 return -EINVAL;
776 } else if (rinfo->prefix_len > 64) {
777 if (rinfo->length < 2) {
778 return -EINVAL;
779 }
780 } else if (rinfo->prefix_len > 0) {
781 if (rinfo->length < 1) {
782 return -EINVAL;
783 }
784 }
785
786 pref = rinfo->route_pref;
787 if (pref == ICMPV6_ROUTER_PREF_INVALID)
788 return -EINVAL;
789
790 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
791
792 if (rinfo->length == 3)
793 prefix = (struct in6_addr *)rinfo->prefix;
794 else {
795 /* this function is safe */
796 ipv6_addr_prefix(&prefix_buf,
797 (struct in6_addr *)rinfo->prefix,
798 rinfo->prefix_len);
799 prefix = &prefix_buf;
800 }
801
802 if (rinfo->prefix_len == 0)
803 rt = rt6_get_dflt_router(gwaddr, dev);
804 else
805 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
806 gwaddr, dev->ifindex);
807
808 if (rt && !lifetime) {
809 ip6_del_rt(rt);
810 rt = NULL;
811 }
812
813 if (!rt && lifetime)
814 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
815 pref);
816 else if (rt)
817 rt->rt6i_flags = RTF_ROUTEINFO |
818 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
819
820 if (rt) {
821 if (!addrconf_finite_timeout(lifetime))
822 rt6_clean_expires(rt);
823 else
824 rt6_set_expires(rt, jiffies + HZ * lifetime);
825
826 ip6_rt_put(rt);
827 }
828 return 0;
829 }
830 #endif
831
832 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
833 struct in6_addr *saddr)
834 {
835 struct fib6_node *pn;
836 while (1) {
837 if (fn->fn_flags & RTN_TL_ROOT)
838 return NULL;
839 pn = fn->parent;
840 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
841 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
842 else
843 fn = pn;
844 if (fn->fn_flags & RTN_RTINFO)
845 return fn;
846 }
847 }
848
849 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
850 struct fib6_table *table,
851 struct flowi6 *fl6, int flags)
852 {
853 struct fib6_node *fn;
854 struct rt6_info *rt;
855
856 read_lock_bh(&table->tb6_lock);
857 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
858 restart:
859 rt = fn->leaf;
860 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
861 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
862 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
863 if (rt == net->ipv6.ip6_null_entry) {
864 fn = fib6_backtrack(fn, &fl6->saddr);
865 if (fn)
866 goto restart;
867 }
868 dst_use(&rt->dst, jiffies);
869 read_unlock_bh(&table->tb6_lock);
870
871 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
872
873 return rt;
874
875 }
876
877 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
878 int flags)
879 {
880 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
881 }
882 EXPORT_SYMBOL_GPL(ip6_route_lookup);
883
884 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
885 const struct in6_addr *saddr, int oif, int strict)
886 {
887 struct flowi6 fl6 = {
888 .flowi6_oif = oif,
889 .daddr = *daddr,
890 };
891 struct dst_entry *dst;
892 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
893
894 if (saddr) {
895 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
896 flags |= RT6_LOOKUP_F_HAS_SADDR;
897 }
898
899 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
900 if (dst->error == 0)
901 return (struct rt6_info *) dst;
902
903 dst_release(dst);
904
905 return NULL;
906 }
907 EXPORT_SYMBOL(rt6_lookup);
908
909 /* ip6_ins_rt is called with FREE table->tb6_lock.
910 It takes new route entry, the addition fails by any reason the
911 route is freed. In any case, if caller does not hold it, it may
912 be destroyed.
913 */
914
915 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
916 struct mx6_config *mxc)
917 {
918 int err;
919 struct fib6_table *table;
920
921 table = rt->rt6i_table;
922 write_lock_bh(&table->tb6_lock);
923 err = fib6_add(&table->tb6_root, rt, info, mxc);
924 write_unlock_bh(&table->tb6_lock);
925
926 return err;
927 }
928
929 int ip6_ins_rt(struct rt6_info *rt)
930 {
931 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
932 struct mx6_config mxc = { .mx = NULL, };
933
934 return __ip6_ins_rt(rt, &info, &mxc);
935 }
936
937 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
938 const struct in6_addr *daddr,
939 const struct in6_addr *saddr)
940 {
941 struct rt6_info *rt;
942
943 /*
944 * Clone the route.
945 */
946
947 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
948 ort = (struct rt6_info *)ort->dst.from;
949
950 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
951
952 if (!rt)
953 return NULL;
954
955 ip6_rt_copy_init(rt, ort);
956 rt->rt6i_flags |= RTF_CACHE;
957 rt->rt6i_metric = 0;
958 rt->dst.flags |= DST_HOST;
959 rt->rt6i_dst.addr = *daddr;
960 rt->rt6i_dst.plen = 128;
961
962 if (!rt6_is_gw_or_nonexthop(ort)) {
963 if (ort->rt6i_dst.plen != 128 &&
964 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
965 rt->rt6i_flags |= RTF_ANYCAST;
966 #ifdef CONFIG_IPV6_SUBTREES
967 if (rt->rt6i_src.plen && saddr) {
968 rt->rt6i_src.addr = *saddr;
969 rt->rt6i_src.plen = 128;
970 }
971 #endif
972 }
973
974 return rt;
975 }
976
977 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
978 {
979 struct rt6_info *pcpu_rt;
980
981 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
982 rt->dst.dev, rt->dst.flags);
983
984 if (!pcpu_rt)
985 return NULL;
986 ip6_rt_copy_init(pcpu_rt, rt);
987 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
988 pcpu_rt->rt6i_flags |= RTF_PCPU;
989 return pcpu_rt;
990 }
991
992 /* It should be called with read_lock_bh(&tb6_lock) acquired */
993 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
994 {
995 struct rt6_info *pcpu_rt, **p;
996
997 p = this_cpu_ptr(rt->rt6i_pcpu);
998 pcpu_rt = *p;
999
1000 if (pcpu_rt) {
1001 dst_hold(&pcpu_rt->dst);
1002 rt6_dst_from_metrics_check(pcpu_rt);
1003 }
1004 return pcpu_rt;
1005 }
1006
1007 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1008 {
1009 struct fib6_table *table = rt->rt6i_table;
1010 struct rt6_info *pcpu_rt, *prev, **p;
1011
1012 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1013 if (!pcpu_rt) {
1014 struct net *net = dev_net(rt->dst.dev);
1015
1016 dst_hold(&net->ipv6.ip6_null_entry->dst);
1017 return net->ipv6.ip6_null_entry;
1018 }
1019
1020 read_lock_bh(&table->tb6_lock);
1021 if (rt->rt6i_pcpu) {
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 prev = cmpxchg(p, NULL, pcpu_rt);
1024 if (prev) {
1025 /* If someone did it before us, return prev instead */
1026 dst_destroy(&pcpu_rt->dst);
1027 pcpu_rt = prev;
1028 }
1029 } else {
1030 /* rt has been removed from the fib6 tree
1031 * before we have a chance to acquire the read_lock.
1032 * In this case, don't brother to create a pcpu rt
1033 * since rt is going away anyway. The next
1034 * dst_check() will trigger a re-lookup.
1035 */
1036 dst_destroy(&pcpu_rt->dst);
1037 pcpu_rt = rt;
1038 }
1039 dst_hold(&pcpu_rt->dst);
1040 rt6_dst_from_metrics_check(pcpu_rt);
1041 read_unlock_bh(&table->tb6_lock);
1042 return pcpu_rt;
1043 }
1044
1045 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
1046 struct flowi6 *fl6, int flags)
1047 {
1048 struct fib6_node *fn, *saved_fn;
1049 struct rt6_info *rt;
1050 int strict = 0;
1051
1052 strict |= flags & RT6_LOOKUP_F_IFACE;
1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1055
1056 read_lock_bh(&table->tb6_lock);
1057
1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1059 saved_fn = fn;
1060
1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
1064 redo_rt6_select:
1065 rt = rt6_select(fn, oif, strict);
1066 if (rt->rt6i_nsiblings)
1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
1077 }
1078 }
1079
1080
1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1088 return rt;
1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
1104
1105 if (uncached_rt)
1106 rt6_uncached_list_add(uncached_rt);
1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
1109
1110 dst_hold(&uncached_rt->dst);
1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
1113 return uncached_rt;
1114
1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
1123
1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
1133 pcpu_rt = rt6_make_pcpu_route(rt);
1134 dst_release(&rt->dst);
1135 }
1136
1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
1138 return pcpu_rt;
1139
1140 }
1141 }
1142
1143 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1144 struct flowi6 *fl6, int flags)
1145 {
1146 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1147 }
1148
1149 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1150 struct net_device *dev,
1151 struct flowi6 *fl6, int flags)
1152 {
1153 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1154 flags |= RT6_LOOKUP_F_IFACE;
1155
1156 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1157 }
1158
1159 void ip6_route_input(struct sk_buff *skb)
1160 {
1161 const struct ipv6hdr *iph = ipv6_hdr(skb);
1162 struct net *net = dev_net(skb->dev);
1163 int flags = RT6_LOOKUP_F_HAS_SADDR;
1164 struct ip_tunnel_info *tun_info;
1165 struct flowi6 fl6 = {
1166 .flowi6_iif = l3mdev_fib_oif(skb->dev),
1167 .daddr = iph->daddr,
1168 .saddr = iph->saddr,
1169 .flowlabel = ip6_flowinfo(iph),
1170 .flowi6_mark = skb->mark,
1171 .flowi6_proto = iph->nexthdr,
1172 };
1173
1174 tun_info = skb_tunnel_info(skb);
1175 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1176 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1177 skb_dst_drop(skb);
1178 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1179 }
1180
1181 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1182 struct flowi6 *fl6, int flags)
1183 {
1184 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1185 }
1186
1187 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1188 struct flowi6 *fl6, int flags)
1189 {
1190 struct dst_entry *dst;
1191 bool any_src;
1192
1193 dst = l3mdev_rt6_dst_by_oif(net, fl6);
1194 if (dst)
1195 return dst;
1196
1197 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1198
1199 any_src = ipv6_addr_any(&fl6->saddr);
1200 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1201 (fl6->flowi6_oif && any_src))
1202 flags |= RT6_LOOKUP_F_IFACE;
1203
1204 if (!any_src)
1205 flags |= RT6_LOOKUP_F_HAS_SADDR;
1206 else if (sk)
1207 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1208
1209 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1210 }
1211 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1212
1213 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1214 {
1215 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1216 struct dst_entry *new = NULL;
1217
1218 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1219 if (rt) {
1220 rt6_info_init(rt);
1221
1222 new = &rt->dst;
1223 new->__use = 1;
1224 new->input = dst_discard;
1225 new->output = dst_discard_out;
1226
1227 dst_copy_metrics(new, &ort->dst);
1228 rt->rt6i_idev = ort->rt6i_idev;
1229 if (rt->rt6i_idev)
1230 in6_dev_hold(rt->rt6i_idev);
1231
1232 rt->rt6i_gateway = ort->rt6i_gateway;
1233 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1234 rt->rt6i_metric = 0;
1235
1236 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1237 #ifdef CONFIG_IPV6_SUBTREES
1238 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1239 #endif
1240
1241 dst_free(new);
1242 }
1243
1244 dst_release(dst_orig);
1245 return new ? new : ERR_PTR(-ENOMEM);
1246 }
1247
1248 /*
1249 * Destination cache support functions
1250 */
1251
1252 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1253 {
1254 if (rt->dst.from &&
1255 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1256 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1257 }
1258
1259 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1260 {
1261 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1262 return NULL;
1263
1264 if (rt6_check_expired(rt))
1265 return NULL;
1266
1267 return &rt->dst;
1268 }
1269
1270 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1271 {
1272 if (!__rt6_check_expired(rt) &&
1273 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1274 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1275 return &rt->dst;
1276 else
1277 return NULL;
1278 }
1279
1280 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1281 {
1282 struct rt6_info *rt;
1283
1284 rt = (struct rt6_info *) dst;
1285
1286 /* All IPV6 dsts are created with ->obsolete set to the value
1287 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1288 * into this function always.
1289 */
1290
1291 rt6_dst_from_metrics_check(rt);
1292
1293 if (rt->rt6i_flags & RTF_PCPU ||
1294 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1295 return rt6_dst_from_check(rt, cookie);
1296 else
1297 return rt6_check(rt, cookie);
1298 }
1299
1300 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1301 {
1302 struct rt6_info *rt = (struct rt6_info *) dst;
1303
1304 if (rt) {
1305 if (rt->rt6i_flags & RTF_CACHE) {
1306 if (rt6_check_expired(rt)) {
1307 ip6_del_rt(rt);
1308 dst = NULL;
1309 }
1310 } else {
1311 dst_release(dst);
1312 dst = NULL;
1313 }
1314 }
1315 return dst;
1316 }
1317
1318 static void ip6_link_failure(struct sk_buff *skb)
1319 {
1320 struct rt6_info *rt;
1321
1322 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1323
1324 rt = (struct rt6_info *) skb_dst(skb);
1325 if (rt) {
1326 if (rt->rt6i_flags & RTF_CACHE) {
1327 dst_hold(&rt->dst);
1328 ip6_del_rt(rt);
1329 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1330 rt->rt6i_node->fn_sernum = -1;
1331 }
1332 }
1333 }
1334
1335 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1336 {
1337 struct net *net = dev_net(rt->dst.dev);
1338
1339 rt->rt6i_flags |= RTF_MODIFIED;
1340 rt->rt6i_pmtu = mtu;
1341 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1342 }
1343
1344 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1345 {
1346 return !(rt->rt6i_flags & RTF_CACHE) &&
1347 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1348 }
1349
1350 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1351 const struct ipv6hdr *iph, u32 mtu)
1352 {
1353 struct rt6_info *rt6 = (struct rt6_info *)dst;
1354
1355 if (rt6->rt6i_flags & RTF_LOCAL)
1356 return;
1357
1358 dst_confirm(dst);
1359 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1360 if (mtu >= dst_mtu(dst))
1361 return;
1362
1363 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1364 rt6_do_update_pmtu(rt6, mtu);
1365 } else {
1366 const struct in6_addr *daddr, *saddr;
1367 struct rt6_info *nrt6;
1368
1369 if (iph) {
1370 daddr = &iph->daddr;
1371 saddr = &iph->saddr;
1372 } else if (sk) {
1373 daddr = &sk->sk_v6_daddr;
1374 saddr = &inet6_sk(sk)->saddr;
1375 } else {
1376 return;
1377 }
1378 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1379 if (nrt6) {
1380 rt6_do_update_pmtu(nrt6, mtu);
1381
1382 /* ip6_ins_rt(nrt6) will bump the
1383 * rt6->rt6i_node->fn_sernum
1384 * which will fail the next rt6_check() and
1385 * invalidate the sk->sk_dst_cache.
1386 */
1387 ip6_ins_rt(nrt6);
1388 }
1389 }
1390 }
1391
1392 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1393 struct sk_buff *skb, u32 mtu)
1394 {
1395 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1396 }
1397
1398 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1399 int oif, u32 mark)
1400 {
1401 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1402 struct dst_entry *dst;
1403 struct flowi6 fl6;
1404
1405 memset(&fl6, 0, sizeof(fl6));
1406 fl6.flowi6_oif = oif;
1407 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1408 fl6.daddr = iph->daddr;
1409 fl6.saddr = iph->saddr;
1410 fl6.flowlabel = ip6_flowinfo(iph);
1411
1412 dst = ip6_route_output(net, NULL, &fl6);
1413 if (!dst->error)
1414 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1415 dst_release(dst);
1416 }
1417 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1418
1419 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1420 {
1421 struct dst_entry *dst;
1422
1423 ip6_update_pmtu(skb, sock_net(sk), mtu,
1424 sk->sk_bound_dev_if, sk->sk_mark);
1425
1426 dst = __sk_dst_get(sk);
1427 if (!dst || !dst->obsolete ||
1428 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1429 return;
1430
1431 bh_lock_sock(sk);
1432 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1433 ip6_datagram_dst_update(sk, false);
1434 bh_unlock_sock(sk);
1435 }
1436 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1437
1438 /* Handle redirects */
1439 struct ip6rd_flowi {
1440 struct flowi6 fl6;
1441 struct in6_addr gateway;
1442 };
1443
1444 static struct rt6_info *__ip6_route_redirect(struct net *net,
1445 struct fib6_table *table,
1446 struct flowi6 *fl6,
1447 int flags)
1448 {
1449 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1450 struct rt6_info *rt;
1451 struct fib6_node *fn;
1452
1453 /* Get the "current" route for this destination and
1454 * check if the redirect has come from approriate router.
1455 *
1456 * RFC 4861 specifies that redirects should only be
1457 * accepted if they come from the nexthop to the target.
1458 * Due to the way the routes are chosen, this notion
1459 * is a bit fuzzy and one might need to check all possible
1460 * routes.
1461 */
1462
1463 read_lock_bh(&table->tb6_lock);
1464 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1465 restart:
1466 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1467 if (rt6_check_expired(rt))
1468 continue;
1469 if (rt->dst.error)
1470 break;
1471 if (!(rt->rt6i_flags & RTF_GATEWAY))
1472 continue;
1473 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1474 continue;
1475 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1476 continue;
1477 break;
1478 }
1479
1480 if (!rt)
1481 rt = net->ipv6.ip6_null_entry;
1482 else if (rt->dst.error) {
1483 rt = net->ipv6.ip6_null_entry;
1484 goto out;
1485 }
1486
1487 if (rt == net->ipv6.ip6_null_entry) {
1488 fn = fib6_backtrack(fn, &fl6->saddr);
1489 if (fn)
1490 goto restart;
1491 }
1492
1493 out:
1494 dst_hold(&rt->dst);
1495
1496 read_unlock_bh(&table->tb6_lock);
1497
1498 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1499 return rt;
1500 };
1501
1502 static struct dst_entry *ip6_route_redirect(struct net *net,
1503 const struct flowi6 *fl6,
1504 const struct in6_addr *gateway)
1505 {
1506 int flags = RT6_LOOKUP_F_HAS_SADDR;
1507 struct ip6rd_flowi rdfl;
1508
1509 rdfl.fl6 = *fl6;
1510 rdfl.gateway = *gateway;
1511
1512 return fib6_rule_lookup(net, &rdfl.fl6,
1513 flags, __ip6_route_redirect);
1514 }
1515
1516 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1517 {
1518 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1519 struct dst_entry *dst;
1520 struct flowi6 fl6;
1521
1522 memset(&fl6, 0, sizeof(fl6));
1523 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1524 fl6.flowi6_oif = oif;
1525 fl6.flowi6_mark = mark;
1526 fl6.daddr = iph->daddr;
1527 fl6.saddr = iph->saddr;
1528 fl6.flowlabel = ip6_flowinfo(iph);
1529
1530 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1531 rt6_do_redirect(dst, NULL, skb);
1532 dst_release(dst);
1533 }
1534 EXPORT_SYMBOL_GPL(ip6_redirect);
1535
1536 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1537 u32 mark)
1538 {
1539 const struct ipv6hdr *iph = ipv6_hdr(skb);
1540 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1541 struct dst_entry *dst;
1542 struct flowi6 fl6;
1543
1544 memset(&fl6, 0, sizeof(fl6));
1545 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1546 fl6.flowi6_oif = oif;
1547 fl6.flowi6_mark = mark;
1548 fl6.daddr = msg->dest;
1549 fl6.saddr = iph->daddr;
1550
1551 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1552 rt6_do_redirect(dst, NULL, skb);
1553 dst_release(dst);
1554 }
1555
1556 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1557 {
1558 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1559 }
1560 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1561
1562 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1563 {
1564 struct net_device *dev = dst->dev;
1565 unsigned int mtu = dst_mtu(dst);
1566 struct net *net = dev_net(dev);
1567
1568 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1569
1570 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1571 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1572
1573 /*
1574 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1575 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1576 * IPV6_MAXPLEN is also valid and means: "any MSS,
1577 * rely only on pmtu discovery"
1578 */
1579 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1580 mtu = IPV6_MAXPLEN;
1581 return mtu;
1582 }
1583
1584 static unsigned int ip6_mtu(const struct dst_entry *dst)
1585 {
1586 const struct rt6_info *rt = (const struct rt6_info *)dst;
1587 unsigned int mtu = rt->rt6i_pmtu;
1588 struct inet6_dev *idev;
1589
1590 if (mtu)
1591 goto out;
1592
1593 mtu = dst_metric_raw(dst, RTAX_MTU);
1594 if (mtu)
1595 goto out;
1596
1597 mtu = IPV6_MIN_MTU;
1598
1599 rcu_read_lock();
1600 idev = __in6_dev_get(dst->dev);
1601 if (idev)
1602 mtu = idev->cnf.mtu6;
1603 rcu_read_unlock();
1604
1605 out:
1606 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1607 }
1608
1609 static struct dst_entry *icmp6_dst_gc_list;
1610 static DEFINE_SPINLOCK(icmp6_dst_lock);
1611
1612 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1613 struct flowi6 *fl6)
1614 {
1615 struct dst_entry *dst;
1616 struct rt6_info *rt;
1617 struct inet6_dev *idev = in6_dev_get(dev);
1618 struct net *net = dev_net(dev);
1619
1620 if (unlikely(!idev))
1621 return ERR_PTR(-ENODEV);
1622
1623 rt = ip6_dst_alloc(net, dev, 0);
1624 if (unlikely(!rt)) {
1625 in6_dev_put(idev);
1626 dst = ERR_PTR(-ENOMEM);
1627 goto out;
1628 }
1629
1630 rt->dst.flags |= DST_HOST;
1631 rt->dst.output = ip6_output;
1632 atomic_set(&rt->dst.__refcnt, 1);
1633 rt->rt6i_gateway = fl6->daddr;
1634 rt->rt6i_dst.addr = fl6->daddr;
1635 rt->rt6i_dst.plen = 128;
1636 rt->rt6i_idev = idev;
1637 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1638
1639 spin_lock_bh(&icmp6_dst_lock);
1640 rt->dst.next = icmp6_dst_gc_list;
1641 icmp6_dst_gc_list = &rt->dst;
1642 spin_unlock_bh(&icmp6_dst_lock);
1643
1644 fib6_force_start_gc(net);
1645
1646 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1647
1648 out:
1649 return dst;
1650 }
1651
1652 int icmp6_dst_gc(void)
1653 {
1654 struct dst_entry *dst, **pprev;
1655 int more = 0;
1656
1657 spin_lock_bh(&icmp6_dst_lock);
1658 pprev = &icmp6_dst_gc_list;
1659
1660 while ((dst = *pprev) != NULL) {
1661 if (!atomic_read(&dst->__refcnt)) {
1662 *pprev = dst->next;
1663 dst_free(dst);
1664 } else {
1665 pprev = &dst->next;
1666 ++more;
1667 }
1668 }
1669
1670 spin_unlock_bh(&icmp6_dst_lock);
1671
1672 return more;
1673 }
1674
1675 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1676 void *arg)
1677 {
1678 struct dst_entry *dst, **pprev;
1679
1680 spin_lock_bh(&icmp6_dst_lock);
1681 pprev = &icmp6_dst_gc_list;
1682 while ((dst = *pprev) != NULL) {
1683 struct rt6_info *rt = (struct rt6_info *) dst;
1684 if (func(rt, arg)) {
1685 *pprev = dst->next;
1686 dst_free(dst);
1687 } else {
1688 pprev = &dst->next;
1689 }
1690 }
1691 spin_unlock_bh(&icmp6_dst_lock);
1692 }
1693
1694 static int ip6_dst_gc(struct dst_ops *ops)
1695 {
1696 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1697 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1698 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1699 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1700 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1701 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1702 int entries;
1703
1704 entries = dst_entries_get_fast(ops);
1705 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1706 entries <= rt_max_size)
1707 goto out;
1708
1709 net->ipv6.ip6_rt_gc_expire++;
1710 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1711 entries = dst_entries_get_slow(ops);
1712 if (entries < ops->gc_thresh)
1713 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1714 out:
1715 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1716 return entries > rt_max_size;
1717 }
1718
1719 static int ip6_convert_metrics(struct mx6_config *mxc,
1720 const struct fib6_config *cfg)
1721 {
1722 bool ecn_ca = false;
1723 struct nlattr *nla;
1724 int remaining;
1725 u32 *mp;
1726
1727 if (!cfg->fc_mx)
1728 return 0;
1729
1730 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1731 if (unlikely(!mp))
1732 return -ENOMEM;
1733
1734 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1735 int type = nla_type(nla);
1736 u32 val;
1737
1738 if (!type)
1739 continue;
1740 if (unlikely(type > RTAX_MAX))
1741 goto err;
1742
1743 if (type == RTAX_CC_ALGO) {
1744 char tmp[TCP_CA_NAME_MAX];
1745
1746 nla_strlcpy(tmp, nla, sizeof(tmp));
1747 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1748 if (val == TCP_CA_UNSPEC)
1749 goto err;
1750 } else {
1751 val = nla_get_u32(nla);
1752 }
1753 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1754 goto err;
1755
1756 mp[type - 1] = val;
1757 __set_bit(type - 1, mxc->mx_valid);
1758 }
1759
1760 if (ecn_ca) {
1761 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1762 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1763 }
1764
1765 mxc->mx = mp;
1766 return 0;
1767 err:
1768 kfree(mp);
1769 return -EINVAL;
1770 }
1771
1772 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1773 {
1774 struct net *net = cfg->fc_nlinfo.nl_net;
1775 struct rt6_info *rt = NULL;
1776 struct net_device *dev = NULL;
1777 struct inet6_dev *idev = NULL;
1778 struct fib6_table *table;
1779 int addr_type;
1780 int err = -EINVAL;
1781
1782 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1783 goto out;
1784 #ifndef CONFIG_IPV6_SUBTREES
1785 if (cfg->fc_src_len)
1786 goto out;
1787 #endif
1788 if (cfg->fc_ifindex) {
1789 err = -ENODEV;
1790 dev = dev_get_by_index(net, cfg->fc_ifindex);
1791 if (!dev)
1792 goto out;
1793 idev = in6_dev_get(dev);
1794 if (!idev)
1795 goto out;
1796 }
1797
1798 if (cfg->fc_metric == 0)
1799 cfg->fc_metric = IP6_RT_PRIO_USER;
1800
1801 err = -ENOBUFS;
1802 if (cfg->fc_nlinfo.nlh &&
1803 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1804 table = fib6_get_table(net, cfg->fc_table);
1805 if (!table) {
1806 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1807 table = fib6_new_table(net, cfg->fc_table);
1808 }
1809 } else {
1810 table = fib6_new_table(net, cfg->fc_table);
1811 }
1812
1813 if (!table)
1814 goto out;
1815
1816 rt = ip6_dst_alloc(net, NULL,
1817 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1818
1819 if (!rt) {
1820 err = -ENOMEM;
1821 goto out;
1822 }
1823
1824 if (cfg->fc_flags & RTF_EXPIRES)
1825 rt6_set_expires(rt, jiffies +
1826 clock_t_to_jiffies(cfg->fc_expires));
1827 else
1828 rt6_clean_expires(rt);
1829
1830 if (cfg->fc_protocol == RTPROT_UNSPEC)
1831 cfg->fc_protocol = RTPROT_BOOT;
1832 rt->rt6i_protocol = cfg->fc_protocol;
1833
1834 addr_type = ipv6_addr_type(&cfg->fc_dst);
1835
1836 if (addr_type & IPV6_ADDR_MULTICAST)
1837 rt->dst.input = ip6_mc_input;
1838 else if (cfg->fc_flags & RTF_LOCAL)
1839 rt->dst.input = ip6_input;
1840 else
1841 rt->dst.input = ip6_forward;
1842
1843 rt->dst.output = ip6_output;
1844
1845 if (cfg->fc_encap) {
1846 struct lwtunnel_state *lwtstate;
1847
1848 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1849 cfg->fc_encap, AF_INET6, cfg,
1850 &lwtstate);
1851 if (err)
1852 goto out;
1853 rt->dst.lwtstate = lwtstate_get(lwtstate);
1854 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1855 rt->dst.lwtstate->orig_output = rt->dst.output;
1856 rt->dst.output = lwtunnel_output;
1857 }
1858 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1859 rt->dst.lwtstate->orig_input = rt->dst.input;
1860 rt->dst.input = lwtunnel_input;
1861 }
1862 }
1863
1864 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1865 rt->rt6i_dst.plen = cfg->fc_dst_len;
1866 if (rt->rt6i_dst.plen == 128)
1867 rt->dst.flags |= DST_HOST;
1868
1869 #ifdef CONFIG_IPV6_SUBTREES
1870 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1871 rt->rt6i_src.plen = cfg->fc_src_len;
1872 #endif
1873
1874 rt->rt6i_metric = cfg->fc_metric;
1875
1876 /* We cannot add true routes via loopback here,
1877 they would result in kernel looping; promote them to reject routes
1878 */
1879 if ((cfg->fc_flags & RTF_REJECT) ||
1880 (dev && (dev->flags & IFF_LOOPBACK) &&
1881 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1882 !(cfg->fc_flags & RTF_LOCAL))) {
1883 /* hold loopback dev/idev if we haven't done so. */
1884 if (dev != net->loopback_dev) {
1885 if (dev) {
1886 dev_put(dev);
1887 in6_dev_put(idev);
1888 }
1889 dev = net->loopback_dev;
1890 dev_hold(dev);
1891 idev = in6_dev_get(dev);
1892 if (!idev) {
1893 err = -ENODEV;
1894 goto out;
1895 }
1896 }
1897 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1898 switch (cfg->fc_type) {
1899 case RTN_BLACKHOLE:
1900 rt->dst.error = -EINVAL;
1901 rt->dst.output = dst_discard_out;
1902 rt->dst.input = dst_discard;
1903 break;
1904 case RTN_PROHIBIT:
1905 rt->dst.error = -EACCES;
1906 rt->dst.output = ip6_pkt_prohibit_out;
1907 rt->dst.input = ip6_pkt_prohibit;
1908 break;
1909 case RTN_THROW:
1910 case RTN_UNREACHABLE:
1911 default:
1912 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1913 : (cfg->fc_type == RTN_UNREACHABLE)
1914 ? -EHOSTUNREACH : -ENETUNREACH;
1915 rt->dst.output = ip6_pkt_discard_out;
1916 rt->dst.input = ip6_pkt_discard;
1917 break;
1918 }
1919 goto install_route;
1920 }
1921
1922 if (cfg->fc_flags & RTF_GATEWAY) {
1923 const struct in6_addr *gw_addr;
1924 int gwa_type;
1925
1926 gw_addr = &cfg->fc_gateway;
1927 gwa_type = ipv6_addr_type(gw_addr);
1928
1929 /* if gw_addr is local we will fail to detect this in case
1930 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1931 * will return already-added prefix route via interface that
1932 * prefix route was assigned to, which might be non-loopback.
1933 */
1934 err = -EINVAL;
1935 if (ipv6_chk_addr_and_flags(net, gw_addr,
1936 gwa_type & IPV6_ADDR_LINKLOCAL ?
1937 dev : NULL, 0, 0))
1938 goto out;
1939
1940 rt->rt6i_gateway = *gw_addr;
1941
1942 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1943 struct rt6_info *grt;
1944
1945 /* IPv6 strictly inhibits using not link-local
1946 addresses as nexthop address.
1947 Otherwise, router will not able to send redirects.
1948 It is very good, but in some (rare!) circumstances
1949 (SIT, PtP, NBMA NOARP links) it is handy to allow
1950 some exceptions. --ANK
1951 */
1952 if (!(gwa_type & IPV6_ADDR_UNICAST))
1953 goto out;
1954
1955 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1956
1957 err = -EHOSTUNREACH;
1958 if (!grt)
1959 goto out;
1960 if (dev) {
1961 if (dev != grt->dst.dev) {
1962 ip6_rt_put(grt);
1963 goto out;
1964 }
1965 } else {
1966 dev = grt->dst.dev;
1967 idev = grt->rt6i_idev;
1968 dev_hold(dev);
1969 in6_dev_hold(grt->rt6i_idev);
1970 }
1971 if (!(grt->rt6i_flags & RTF_GATEWAY))
1972 err = 0;
1973 ip6_rt_put(grt);
1974
1975 if (err)
1976 goto out;
1977 }
1978 err = -EINVAL;
1979 if (!dev || (dev->flags & IFF_LOOPBACK))
1980 goto out;
1981 }
1982
1983 err = -ENODEV;
1984 if (!dev)
1985 goto out;
1986
1987 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1988 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1989 err = -EINVAL;
1990 goto out;
1991 }
1992 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1993 rt->rt6i_prefsrc.plen = 128;
1994 } else
1995 rt->rt6i_prefsrc.plen = 0;
1996
1997 rt->rt6i_flags = cfg->fc_flags;
1998
1999 install_route:
2000 rt->dst.dev = dev;
2001 rt->rt6i_idev = idev;
2002 rt->rt6i_table = table;
2003
2004 cfg->fc_nlinfo.nl_net = dev_net(dev);
2005
2006 return rt;
2007 out:
2008 if (dev)
2009 dev_put(dev);
2010 if (idev)
2011 in6_dev_put(idev);
2012 if (rt)
2013 dst_free(&rt->dst);
2014
2015 return ERR_PTR(err);
2016 }
2017
2018 int ip6_route_add(struct fib6_config *cfg)
2019 {
2020 struct mx6_config mxc = { .mx = NULL, };
2021 struct rt6_info *rt;
2022 int err;
2023
2024 rt = ip6_route_info_create(cfg);
2025 if (IS_ERR(rt)) {
2026 err = PTR_ERR(rt);
2027 rt = NULL;
2028 goto out;
2029 }
2030
2031 err = ip6_convert_metrics(&mxc, cfg);
2032 if (err)
2033 goto out;
2034
2035 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2036
2037 kfree(mxc.mx);
2038
2039 return err;
2040 out:
2041 if (rt)
2042 dst_free(&rt->dst);
2043
2044 return err;
2045 }
2046
2047 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2048 {
2049 int err;
2050 struct fib6_table *table;
2051 struct net *net = dev_net(rt->dst.dev);
2052
2053 if (rt == net->ipv6.ip6_null_entry ||
2054 rt->dst.flags & DST_NOCACHE) {
2055 err = -ENOENT;
2056 goto out;
2057 }
2058
2059 table = rt->rt6i_table;
2060 write_lock_bh(&table->tb6_lock);
2061 err = fib6_del(rt, info);
2062 write_unlock_bh(&table->tb6_lock);
2063
2064 out:
2065 ip6_rt_put(rt);
2066 return err;
2067 }
2068
2069 int ip6_del_rt(struct rt6_info *rt)
2070 {
2071 struct nl_info info = {
2072 .nl_net = dev_net(rt->dst.dev),
2073 };
2074 return __ip6_del_rt(rt, &info);
2075 }
2076
2077 static int ip6_route_del(struct fib6_config *cfg)
2078 {
2079 struct fib6_table *table;
2080 struct fib6_node *fn;
2081 struct rt6_info *rt;
2082 int err = -ESRCH;
2083
2084 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2085 if (!table)
2086 return err;
2087
2088 read_lock_bh(&table->tb6_lock);
2089
2090 fn = fib6_locate(&table->tb6_root,
2091 &cfg->fc_dst, cfg->fc_dst_len,
2092 &cfg->fc_src, cfg->fc_src_len);
2093
2094 if (fn) {
2095 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2096 if ((rt->rt6i_flags & RTF_CACHE) &&
2097 !(cfg->fc_flags & RTF_CACHE))
2098 continue;
2099 if (cfg->fc_ifindex &&
2100 (!rt->dst.dev ||
2101 rt->dst.dev->ifindex != cfg->fc_ifindex))
2102 continue;
2103 if (cfg->fc_flags & RTF_GATEWAY &&
2104 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2105 continue;
2106 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2107 continue;
2108 dst_hold(&rt->dst);
2109 read_unlock_bh(&table->tb6_lock);
2110
2111 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2112 }
2113 }
2114 read_unlock_bh(&table->tb6_lock);
2115
2116 return err;
2117 }
2118
2119 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2120 {
2121 struct netevent_redirect netevent;
2122 struct rt6_info *rt, *nrt = NULL;
2123 struct ndisc_options ndopts;
2124 struct inet6_dev *in6_dev;
2125 struct neighbour *neigh;
2126 struct rd_msg *msg;
2127 int optlen, on_link;
2128 u8 *lladdr;
2129
2130 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2131 optlen -= sizeof(*msg);
2132
2133 if (optlen < 0) {
2134 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2135 return;
2136 }
2137
2138 msg = (struct rd_msg *)icmp6_hdr(skb);
2139
2140 if (ipv6_addr_is_multicast(&msg->dest)) {
2141 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2142 return;
2143 }
2144
2145 on_link = 0;
2146 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2147 on_link = 1;
2148 } else if (ipv6_addr_type(&msg->target) !=
2149 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2150 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2151 return;
2152 }
2153
2154 in6_dev = __in6_dev_get(skb->dev);
2155 if (!in6_dev)
2156 return;
2157 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2158 return;
2159
2160 /* RFC2461 8.1:
2161 * The IP source address of the Redirect MUST be the same as the current
2162 * first-hop router for the specified ICMP Destination Address.
2163 */
2164
2165 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
2166 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2167 return;
2168 }
2169
2170 lladdr = NULL;
2171 if (ndopts.nd_opts_tgt_lladdr) {
2172 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2173 skb->dev);
2174 if (!lladdr) {
2175 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2176 return;
2177 }
2178 }
2179
2180 rt = (struct rt6_info *) dst;
2181 if (rt->rt6i_flags & RTF_REJECT) {
2182 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2183 return;
2184 }
2185
2186 /* Redirect received -> path was valid.
2187 * Look, redirects are sent only in response to data packets,
2188 * so that this nexthop apparently is reachable. --ANK
2189 */
2190 dst_confirm(&rt->dst);
2191
2192 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2193 if (!neigh)
2194 return;
2195
2196 /*
2197 * We have finally decided to accept it.
2198 */
2199
2200 neigh_update(neigh, lladdr, NUD_STALE,
2201 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2202 NEIGH_UPDATE_F_OVERRIDE|
2203 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2204 NEIGH_UPDATE_F_ISROUTER))
2205 );
2206
2207 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2208 if (!nrt)
2209 goto out;
2210
2211 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2212 if (on_link)
2213 nrt->rt6i_flags &= ~RTF_GATEWAY;
2214
2215 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2216
2217 if (ip6_ins_rt(nrt))
2218 goto out;
2219
2220 netevent.old = &rt->dst;
2221 netevent.new = &nrt->dst;
2222 netevent.daddr = &msg->dest;
2223 netevent.neigh = neigh;
2224 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2225
2226 if (rt->rt6i_flags & RTF_CACHE) {
2227 rt = (struct rt6_info *) dst_clone(&rt->dst);
2228 ip6_del_rt(rt);
2229 }
2230
2231 out:
2232 neigh_release(neigh);
2233 }
2234
2235 /*
2236 * Misc support functions
2237 */
2238
2239 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2240 {
2241 BUG_ON(from->dst.from);
2242
2243 rt->rt6i_flags &= ~RTF_EXPIRES;
2244 dst_hold(&from->dst);
2245 rt->dst.from = &from->dst;
2246 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2247 }
2248
2249 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2250 {
2251 rt->dst.input = ort->dst.input;
2252 rt->dst.output = ort->dst.output;
2253 rt->rt6i_dst = ort->rt6i_dst;
2254 rt->dst.error = ort->dst.error;
2255 rt->rt6i_idev = ort->rt6i_idev;
2256 if (rt->rt6i_idev)
2257 in6_dev_hold(rt->rt6i_idev);
2258 rt->dst.lastuse = jiffies;
2259 rt->rt6i_gateway = ort->rt6i_gateway;
2260 rt->rt6i_flags = ort->rt6i_flags;
2261 rt6_set_from(rt, ort);
2262 rt->rt6i_metric = ort->rt6i_metric;
2263 #ifdef CONFIG_IPV6_SUBTREES
2264 rt->rt6i_src = ort->rt6i_src;
2265 #endif
2266 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2267 rt->rt6i_table = ort->rt6i_table;
2268 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2269 }
2270
2271 #ifdef CONFIG_IPV6_ROUTE_INFO
2272 static struct rt6_info *rt6_get_route_info(struct net *net,
2273 const struct in6_addr *prefix, int prefixlen,
2274 const struct in6_addr *gwaddr, int ifindex)
2275 {
2276 struct fib6_node *fn;
2277 struct rt6_info *rt = NULL;
2278 struct fib6_table *table;
2279
2280 table = fib6_get_table(net, RT6_TABLE_INFO);
2281 if (!table)
2282 return NULL;
2283
2284 read_lock_bh(&table->tb6_lock);
2285 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2286 if (!fn)
2287 goto out;
2288
2289 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2290 if (rt->dst.dev->ifindex != ifindex)
2291 continue;
2292 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2293 continue;
2294 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2295 continue;
2296 dst_hold(&rt->dst);
2297 break;
2298 }
2299 out:
2300 read_unlock_bh(&table->tb6_lock);
2301 return rt;
2302 }
2303
2304 static struct rt6_info *rt6_add_route_info(struct net *net,
2305 const struct in6_addr *prefix, int prefixlen,
2306 const struct in6_addr *gwaddr, int ifindex,
2307 unsigned int pref)
2308 {
2309 struct fib6_config cfg = {
2310 .fc_metric = IP6_RT_PRIO_USER,
2311 .fc_ifindex = ifindex,
2312 .fc_dst_len = prefixlen,
2313 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2314 RTF_UP | RTF_PREF(pref),
2315 .fc_nlinfo.portid = 0,
2316 .fc_nlinfo.nlh = NULL,
2317 .fc_nlinfo.nl_net = net,
2318 };
2319
2320 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
2321 cfg.fc_dst = *prefix;
2322 cfg.fc_gateway = *gwaddr;
2323
2324 /* We should treat it as a default route if prefix length is 0. */
2325 if (!prefixlen)
2326 cfg.fc_flags |= RTF_DEFAULT;
2327
2328 ip6_route_add(&cfg);
2329
2330 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2331 }
2332 #endif
2333
2334 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2335 {
2336 struct rt6_info *rt;
2337 struct fib6_table *table;
2338
2339 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2340 if (!table)
2341 return NULL;
2342
2343 read_lock_bh(&table->tb6_lock);
2344 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2345 if (dev == rt->dst.dev &&
2346 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2347 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2348 break;
2349 }
2350 if (rt)
2351 dst_hold(&rt->dst);
2352 read_unlock_bh(&table->tb6_lock);
2353 return rt;
2354 }
2355
2356 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2357 struct net_device *dev,
2358 unsigned int pref)
2359 {
2360 struct fib6_config cfg = {
2361 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2362 .fc_metric = IP6_RT_PRIO_USER,
2363 .fc_ifindex = dev->ifindex,
2364 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2365 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2366 .fc_nlinfo.portid = 0,
2367 .fc_nlinfo.nlh = NULL,
2368 .fc_nlinfo.nl_net = dev_net(dev),
2369 };
2370
2371 cfg.fc_gateway = *gwaddr;
2372
2373 ip6_route_add(&cfg);
2374
2375 return rt6_get_dflt_router(gwaddr, dev);
2376 }
2377
2378 void rt6_purge_dflt_routers(struct net *net)
2379 {
2380 struct rt6_info *rt;
2381 struct fib6_table *table;
2382
2383 /* NOTE: Keep consistent with rt6_get_dflt_router */
2384 table = fib6_get_table(net, RT6_TABLE_DFLT);
2385 if (!table)
2386 return;
2387
2388 restart:
2389 read_lock_bh(&table->tb6_lock);
2390 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2391 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2392 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2393 dst_hold(&rt->dst);
2394 read_unlock_bh(&table->tb6_lock);
2395 ip6_del_rt(rt);
2396 goto restart;
2397 }
2398 }
2399 read_unlock_bh(&table->tb6_lock);
2400 }
2401
2402 static void rtmsg_to_fib6_config(struct net *net,
2403 struct in6_rtmsg *rtmsg,
2404 struct fib6_config *cfg)
2405 {
2406 memset(cfg, 0, sizeof(*cfg));
2407
2408 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2409 : RT6_TABLE_MAIN;
2410 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2411 cfg->fc_metric = rtmsg->rtmsg_metric;
2412 cfg->fc_expires = rtmsg->rtmsg_info;
2413 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2414 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2415 cfg->fc_flags = rtmsg->rtmsg_flags;
2416
2417 cfg->fc_nlinfo.nl_net = net;
2418
2419 cfg->fc_dst = rtmsg->rtmsg_dst;
2420 cfg->fc_src = rtmsg->rtmsg_src;
2421 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2422 }
2423
2424 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2425 {
2426 struct fib6_config cfg;
2427 struct in6_rtmsg rtmsg;
2428 int err;
2429
2430 switch (cmd) {
2431 case SIOCADDRT: /* Add a route */
2432 case SIOCDELRT: /* Delete a route */
2433 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2434 return -EPERM;
2435 err = copy_from_user(&rtmsg, arg,
2436 sizeof(struct in6_rtmsg));
2437 if (err)
2438 return -EFAULT;
2439
2440 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2441
2442 rtnl_lock();
2443 switch (cmd) {
2444 case SIOCADDRT:
2445 err = ip6_route_add(&cfg);
2446 break;
2447 case SIOCDELRT:
2448 err = ip6_route_del(&cfg);
2449 break;
2450 default:
2451 err = -EINVAL;
2452 }
2453 rtnl_unlock();
2454
2455 return err;
2456 }
2457
2458 return -EINVAL;
2459 }
2460
2461 /*
2462 * Drop the packet on the floor
2463 */
2464
2465 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2466 {
2467 int type;
2468 struct dst_entry *dst = skb_dst(skb);
2469 switch (ipstats_mib_noroutes) {
2470 case IPSTATS_MIB_INNOROUTES:
2471 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2472 if (type == IPV6_ADDR_ANY) {
2473 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2474 IPSTATS_MIB_INADDRERRORS);
2475 break;
2476 }
2477 /* FALLTHROUGH */
2478 case IPSTATS_MIB_OUTNOROUTES:
2479 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2480 ipstats_mib_noroutes);
2481 break;
2482 }
2483 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2484 kfree_skb(skb);
2485 return 0;
2486 }
2487
2488 static int ip6_pkt_discard(struct sk_buff *skb)
2489 {
2490 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2491 }
2492
2493 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2494 {
2495 skb->dev = skb_dst(skb)->dev;
2496 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2497 }
2498
2499 static int ip6_pkt_prohibit(struct sk_buff *skb)
2500 {
2501 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2502 }
2503
2504 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2505 {
2506 skb->dev = skb_dst(skb)->dev;
2507 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2508 }
2509
2510 /*
2511 * Allocate a dst for local (unicast / anycast) address.
2512 */
2513
2514 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2515 const struct in6_addr *addr,
2516 bool anycast)
2517 {
2518 u32 tb_id;
2519 struct net *net = dev_net(idev->dev);
2520 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2521 DST_NOCOUNT);
2522 if (!rt)
2523 return ERR_PTR(-ENOMEM);
2524
2525 in6_dev_hold(idev);
2526
2527 rt->dst.flags |= DST_HOST;
2528 rt->dst.input = ip6_input;
2529 rt->dst.output = ip6_output;
2530 rt->rt6i_idev = idev;
2531
2532 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2533 if (anycast)
2534 rt->rt6i_flags |= RTF_ANYCAST;
2535 else
2536 rt->rt6i_flags |= RTF_LOCAL;
2537
2538 rt->rt6i_gateway = *addr;
2539 rt->rt6i_dst.addr = *addr;
2540 rt->rt6i_dst.plen = 128;
2541 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2542 rt->rt6i_table = fib6_get_table(net, tb_id);
2543 rt->dst.flags |= DST_NOCACHE;
2544
2545 atomic_set(&rt->dst.__refcnt, 1);
2546
2547 return rt;
2548 }
2549
2550 int ip6_route_get_saddr(struct net *net,
2551 struct rt6_info *rt,
2552 const struct in6_addr *daddr,
2553 unsigned int prefs,
2554 struct in6_addr *saddr)
2555 {
2556 struct inet6_dev *idev =
2557 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
2558 int err = 0;
2559 if (rt && rt->rt6i_prefsrc.plen)
2560 *saddr = rt->rt6i_prefsrc.addr;
2561 else
2562 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2563 daddr, prefs, saddr);
2564 return err;
2565 }
2566
2567 /* remove deleted ip from prefsrc entries */
2568 struct arg_dev_net_ip {
2569 struct net_device *dev;
2570 struct net *net;
2571 struct in6_addr *addr;
2572 };
2573
2574 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2575 {
2576 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2577 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2578 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2579
2580 if (((void *)rt->dst.dev == dev || !dev) &&
2581 rt != net->ipv6.ip6_null_entry &&
2582 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2583 /* remove prefsrc entry */
2584 rt->rt6i_prefsrc.plen = 0;
2585 }
2586 return 0;
2587 }
2588
2589 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2590 {
2591 struct net *net = dev_net(ifp->idev->dev);
2592 struct arg_dev_net_ip adni = {
2593 .dev = ifp->idev->dev,
2594 .net = net,
2595 .addr = &ifp->addr,
2596 };
2597 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2598 }
2599
2600 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2601 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2602
2603 /* Remove routers and update dst entries when gateway turn into host. */
2604 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2605 {
2606 struct in6_addr *gateway = (struct in6_addr *)arg;
2607
2608 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2609 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2610 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2611 return -1;
2612 }
2613 return 0;
2614 }
2615
2616 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2617 {
2618 fib6_clean_all(net, fib6_clean_tohost, gateway);
2619 }
2620
2621 struct arg_dev_net {
2622 struct net_device *dev;
2623 struct net *net;
2624 };
2625
2626 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2627 {
2628 const struct arg_dev_net *adn = arg;
2629 const struct net_device *dev = adn->dev;
2630
2631 if ((rt->dst.dev == dev || !dev) &&
2632 rt != adn->net->ipv6.ip6_null_entry)
2633 return -1;
2634
2635 return 0;
2636 }
2637
2638 void rt6_ifdown(struct net *net, struct net_device *dev)
2639 {
2640 struct arg_dev_net adn = {
2641 .dev = dev,
2642 .net = net,
2643 };
2644
2645 fib6_clean_all(net, fib6_ifdown, &adn);
2646 icmp6_clean_all(fib6_ifdown, &adn);
2647 if (dev)
2648 rt6_uncached_list_flush_dev(net, dev);
2649 }
2650
2651 struct rt6_mtu_change_arg {
2652 struct net_device *dev;
2653 unsigned int mtu;
2654 };
2655
2656 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2657 {
2658 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2659 struct inet6_dev *idev;
2660
2661 /* In IPv6 pmtu discovery is not optional,
2662 so that RTAX_MTU lock cannot disable it.
2663 We still use this lock to block changes
2664 caused by addrconf/ndisc.
2665 */
2666
2667 idev = __in6_dev_get(arg->dev);
2668 if (!idev)
2669 return 0;
2670
2671 /* For administrative MTU increase, there is no way to discover
2672 IPv6 PMTU increase, so PMTU increase should be updated here.
2673 Since RFC 1981 doesn't include administrative MTU increase
2674 update PMTU increase is a MUST. (i.e. jumbo frame)
2675 */
2676 /*
2677 If new MTU is less than route PMTU, this new MTU will be the
2678 lowest MTU in the path, update the route PMTU to reflect PMTU
2679 decreases; if new MTU is greater than route PMTU, and the
2680 old MTU is the lowest MTU in the path, update the route PMTU
2681 to reflect the increase. In this case if the other nodes' MTU
2682 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2683 PMTU discouvery.
2684 */
2685 if (rt->dst.dev == arg->dev &&
2686 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2687 if (rt->rt6i_flags & RTF_CACHE) {
2688 /* For RTF_CACHE with rt6i_pmtu == 0
2689 * (i.e. a redirected route),
2690 * the metrics of its rt->dst.from has already
2691 * been updated.
2692 */
2693 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2694 rt->rt6i_pmtu = arg->mtu;
2695 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2696 (dst_mtu(&rt->dst) < arg->mtu &&
2697 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2698 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2699 }
2700 }
2701 return 0;
2702 }
2703
2704 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2705 {
2706 struct rt6_mtu_change_arg arg = {
2707 .dev = dev,
2708 .mtu = mtu,
2709 };
2710
2711 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2712 }
2713
2714 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2715 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2716 [RTA_OIF] = { .type = NLA_U32 },
2717 [RTA_IIF] = { .type = NLA_U32 },
2718 [RTA_PRIORITY] = { .type = NLA_U32 },
2719 [RTA_METRICS] = { .type = NLA_NESTED },
2720 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2721 [RTA_PREF] = { .type = NLA_U8 },
2722 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2723 [RTA_ENCAP] = { .type = NLA_NESTED },
2724 [RTA_EXPIRES] = { .type = NLA_U32 },
2725 };
2726
2727 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2728 struct fib6_config *cfg)
2729 {
2730 struct rtmsg *rtm;
2731 struct nlattr *tb[RTA_MAX+1];
2732 unsigned int pref;
2733 int err;
2734
2735 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2736 if (err < 0)
2737 goto errout;
2738
2739 err = -EINVAL;
2740 rtm = nlmsg_data(nlh);
2741 memset(cfg, 0, sizeof(*cfg));
2742
2743 cfg->fc_table = rtm->rtm_table;
2744 cfg->fc_dst_len = rtm->rtm_dst_len;
2745 cfg->fc_src_len = rtm->rtm_src_len;
2746 cfg->fc_flags = RTF_UP;
2747 cfg->fc_protocol = rtm->rtm_protocol;
2748 cfg->fc_type = rtm->rtm_type;
2749
2750 if (rtm->rtm_type == RTN_UNREACHABLE ||
2751 rtm->rtm_type == RTN_BLACKHOLE ||
2752 rtm->rtm_type == RTN_PROHIBIT ||
2753 rtm->rtm_type == RTN_THROW)
2754 cfg->fc_flags |= RTF_REJECT;
2755
2756 if (rtm->rtm_type == RTN_LOCAL)
2757 cfg->fc_flags |= RTF_LOCAL;
2758
2759 if (rtm->rtm_flags & RTM_F_CLONED)
2760 cfg->fc_flags |= RTF_CACHE;
2761
2762 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2763 cfg->fc_nlinfo.nlh = nlh;
2764 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2765
2766 if (tb[RTA_GATEWAY]) {
2767 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2768 cfg->fc_flags |= RTF_GATEWAY;
2769 }
2770
2771 if (tb[RTA_DST]) {
2772 int plen = (rtm->rtm_dst_len + 7) >> 3;
2773
2774 if (nla_len(tb[RTA_DST]) < plen)
2775 goto errout;
2776
2777 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2778 }
2779
2780 if (tb[RTA_SRC]) {
2781 int plen = (rtm->rtm_src_len + 7) >> 3;
2782
2783 if (nla_len(tb[RTA_SRC]) < plen)
2784 goto errout;
2785
2786 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2787 }
2788
2789 if (tb[RTA_PREFSRC])
2790 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2791
2792 if (tb[RTA_OIF])
2793 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2794
2795 if (tb[RTA_PRIORITY])
2796 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2797
2798 if (tb[RTA_METRICS]) {
2799 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2800 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2801 }
2802
2803 if (tb[RTA_TABLE])
2804 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2805
2806 if (tb[RTA_MULTIPATH]) {
2807 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2808 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2809 }
2810
2811 if (tb[RTA_PREF]) {
2812 pref = nla_get_u8(tb[RTA_PREF]);
2813 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2814 pref != ICMPV6_ROUTER_PREF_HIGH)
2815 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2816 cfg->fc_flags |= RTF_PREF(pref);
2817 }
2818
2819 if (tb[RTA_ENCAP])
2820 cfg->fc_encap = tb[RTA_ENCAP];
2821
2822 if (tb[RTA_ENCAP_TYPE])
2823 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2824
2825 if (tb[RTA_EXPIRES]) {
2826 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2827
2828 if (addrconf_finite_timeout(timeout)) {
2829 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2830 cfg->fc_flags |= RTF_EXPIRES;
2831 }
2832 }
2833
2834 err = 0;
2835 errout:
2836 return err;
2837 }
2838
2839 struct rt6_nh {
2840 struct rt6_info *rt6_info;
2841 struct fib6_config r_cfg;
2842 struct mx6_config mxc;
2843 struct list_head next;
2844 };
2845
2846 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2847 {
2848 struct rt6_nh *nh;
2849
2850 list_for_each_entry(nh, rt6_nh_list, next) {
2851 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2852 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2853 nh->r_cfg.fc_ifindex);
2854 }
2855 }
2856
2857 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2858 struct rt6_info *rt, struct fib6_config *r_cfg)
2859 {
2860 struct rt6_nh *nh;
2861 struct rt6_info *rtnh;
2862 int err = -EEXIST;
2863
2864 list_for_each_entry(nh, rt6_nh_list, next) {
2865 /* check if rt6_info already exists */
2866 rtnh = nh->rt6_info;
2867
2868 if (rtnh->dst.dev == rt->dst.dev &&
2869 rtnh->rt6i_idev == rt->rt6i_idev &&
2870 ipv6_addr_equal(&rtnh->rt6i_gateway,
2871 &rt->rt6i_gateway))
2872 return err;
2873 }
2874
2875 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2876 if (!nh)
2877 return -ENOMEM;
2878 nh->rt6_info = rt;
2879 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2880 if (err) {
2881 kfree(nh);
2882 return err;
2883 }
2884 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2885 list_add_tail(&nh->next, rt6_nh_list);
2886
2887 return 0;
2888 }
2889
2890 static int ip6_route_multipath_add(struct fib6_config *cfg)
2891 {
2892 struct fib6_config r_cfg;
2893 struct rtnexthop *rtnh;
2894 struct rt6_info *rt;
2895 struct rt6_nh *err_nh;
2896 struct rt6_nh *nh, *nh_safe;
2897 int remaining;
2898 int attrlen;
2899 int err = 1;
2900 int nhn = 0;
2901 int replace = (cfg->fc_nlinfo.nlh &&
2902 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2903 LIST_HEAD(rt6_nh_list);
2904
2905 remaining = cfg->fc_mp_len;
2906 rtnh = (struct rtnexthop *)cfg->fc_mp;
2907
2908 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2909 * rt6_info structs per nexthop
2910 */
2911 while (rtnh_ok(rtnh, remaining)) {
2912 memcpy(&r_cfg, cfg, sizeof(*cfg));
2913 if (rtnh->rtnh_ifindex)
2914 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2915
2916 attrlen = rtnh_attrlen(rtnh);
2917 if (attrlen > 0) {
2918 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2919
2920 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2921 if (nla) {
2922 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2923 r_cfg.fc_flags |= RTF_GATEWAY;
2924 }
2925 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2926 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2927 if (nla)
2928 r_cfg.fc_encap_type = nla_get_u16(nla);
2929 }
2930
2931 rt = ip6_route_info_create(&r_cfg);
2932 if (IS_ERR(rt)) {
2933 err = PTR_ERR(rt);
2934 rt = NULL;
2935 goto cleanup;
2936 }
2937
2938 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2939 if (err) {
2940 dst_free(&rt->dst);
2941 goto cleanup;
2942 }
2943
2944 rtnh = rtnh_next(rtnh, &remaining);
2945 }
2946
2947 err_nh = NULL;
2948 list_for_each_entry(nh, &rt6_nh_list, next) {
2949 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2950 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2951 nh->rt6_info = NULL;
2952 if (err) {
2953 if (replace && nhn)
2954 ip6_print_replace_route_err(&rt6_nh_list);
2955 err_nh = nh;
2956 goto add_errout;
2957 }
2958
2959 /* Because each route is added like a single route we remove
2960 * these flags after the first nexthop: if there is a collision,
2961 * we have already failed to add the first nexthop:
2962 * fib6_add_rt2node() has rejected it; when replacing, old
2963 * nexthops have been replaced by first new, the rest should
2964 * be added to it.
2965 */
2966 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2967 NLM_F_REPLACE);
2968 nhn++;
2969 }
2970
2971 goto cleanup;
2972
2973 add_errout:
2974 /* Delete routes that were already added */
2975 list_for_each_entry(nh, &rt6_nh_list, next) {
2976 if (err_nh == nh)
2977 break;
2978 ip6_route_del(&nh->r_cfg);
2979 }
2980
2981 cleanup:
2982 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
2983 if (nh->rt6_info)
2984 dst_free(&nh->rt6_info->dst);
2985 kfree(nh->mxc.mx);
2986 list_del(&nh->next);
2987 kfree(nh);
2988 }
2989
2990 return err;
2991 }
2992
2993 static int ip6_route_multipath_del(struct fib6_config *cfg)
2994 {
2995 struct fib6_config r_cfg;
2996 struct rtnexthop *rtnh;
2997 int remaining;
2998 int attrlen;
2999 int err = 1, last_err = 0;
3000
3001 remaining = cfg->fc_mp_len;
3002 rtnh = (struct rtnexthop *)cfg->fc_mp;
3003
3004 /* Parse a Multipath Entry */
3005 while (rtnh_ok(rtnh, remaining)) {
3006 memcpy(&r_cfg, cfg, sizeof(*cfg));
3007 if (rtnh->rtnh_ifindex)
3008 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3009
3010 attrlen = rtnh_attrlen(rtnh);
3011 if (attrlen > 0) {
3012 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3013
3014 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3015 if (nla) {
3016 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3017 r_cfg.fc_flags |= RTF_GATEWAY;
3018 }
3019 }
3020 err = ip6_route_del(&r_cfg);
3021 if (err)
3022 last_err = err;
3023
3024 rtnh = rtnh_next(rtnh, &remaining);
3025 }
3026
3027 return last_err;
3028 }
3029
3030 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3031 {
3032 struct fib6_config cfg;
3033 int err;
3034
3035 err = rtm_to_fib6_config(skb, nlh, &cfg);
3036 if (err < 0)
3037 return err;
3038
3039 if (cfg.fc_mp)
3040 return ip6_route_multipath_del(&cfg);
3041 else
3042 return ip6_route_del(&cfg);
3043 }
3044
3045 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3046 {
3047 struct fib6_config cfg;
3048 int err;
3049
3050 err = rtm_to_fib6_config(skb, nlh, &cfg);
3051 if (err < 0)
3052 return err;
3053
3054 if (cfg.fc_mp)
3055 return ip6_route_multipath_add(&cfg);
3056 else
3057 return ip6_route_add(&cfg);
3058 }
3059
3060 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3061 {
3062 return NLMSG_ALIGN(sizeof(struct rtmsg))
3063 + nla_total_size(16) /* RTA_SRC */
3064 + nla_total_size(16) /* RTA_DST */
3065 + nla_total_size(16) /* RTA_GATEWAY */
3066 + nla_total_size(16) /* RTA_PREFSRC */
3067 + nla_total_size(4) /* RTA_TABLE */
3068 + nla_total_size(4) /* RTA_IIF */
3069 + nla_total_size(4) /* RTA_OIF */
3070 + nla_total_size(4) /* RTA_PRIORITY */
3071 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3072 + nla_total_size(sizeof(struct rta_cacheinfo))
3073 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3074 + nla_total_size(1) /* RTA_PREF */
3075 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3076 }
3077
3078 static int rt6_fill_node(struct net *net,
3079 struct sk_buff *skb, struct rt6_info *rt,
3080 struct in6_addr *dst, struct in6_addr *src,
3081 int iif, int type, u32 portid, u32 seq,
3082 int prefix, int nowait, unsigned int flags)
3083 {
3084 u32 metrics[RTAX_MAX];
3085 struct rtmsg *rtm;
3086 struct nlmsghdr *nlh;
3087 long expires;
3088 u32 table;
3089
3090 if (prefix) { /* user wants prefix routes only */
3091 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3092 /* success since this is not a prefix route */
3093 return 1;
3094 }
3095 }
3096
3097 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3098 if (!nlh)
3099 return -EMSGSIZE;
3100
3101 rtm = nlmsg_data(nlh);
3102 rtm->rtm_family = AF_INET6;
3103 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3104 rtm->rtm_src_len = rt->rt6i_src.plen;
3105 rtm->rtm_tos = 0;
3106 if (rt->rt6i_table)
3107 table = rt->rt6i_table->tb6_id;
3108 else
3109 table = RT6_TABLE_UNSPEC;
3110 rtm->rtm_table = table;
3111 if (nla_put_u32(skb, RTA_TABLE, table))
3112 goto nla_put_failure;
3113 if (rt->rt6i_flags & RTF_REJECT) {
3114 switch (rt->dst.error) {
3115 case -EINVAL:
3116 rtm->rtm_type = RTN_BLACKHOLE;
3117 break;
3118 case -EACCES:
3119 rtm->rtm_type = RTN_PROHIBIT;
3120 break;
3121 case -EAGAIN:
3122 rtm->rtm_type = RTN_THROW;
3123 break;
3124 default:
3125 rtm->rtm_type = RTN_UNREACHABLE;
3126 break;
3127 }
3128 }
3129 else if (rt->rt6i_flags & RTF_LOCAL)
3130 rtm->rtm_type = RTN_LOCAL;
3131 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3132 rtm->rtm_type = RTN_LOCAL;
3133 else
3134 rtm->rtm_type = RTN_UNICAST;
3135 rtm->rtm_flags = 0;
3136 if (!netif_carrier_ok(rt->dst.dev)) {
3137 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3138 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3139 rtm->rtm_flags |= RTNH_F_DEAD;
3140 }
3141 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3142 rtm->rtm_protocol = rt->rt6i_protocol;
3143 if (rt->rt6i_flags & RTF_DYNAMIC)
3144 rtm->rtm_protocol = RTPROT_REDIRECT;
3145 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3146 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3147 rtm->rtm_protocol = RTPROT_RA;
3148 else
3149 rtm->rtm_protocol = RTPROT_KERNEL;
3150 }
3151
3152 if (rt->rt6i_flags & RTF_CACHE)
3153 rtm->rtm_flags |= RTM_F_CLONED;
3154
3155 if (dst) {
3156 if (nla_put_in6_addr(skb, RTA_DST, dst))
3157 goto nla_put_failure;
3158 rtm->rtm_dst_len = 128;
3159 } else if (rtm->rtm_dst_len)
3160 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3161 goto nla_put_failure;
3162 #ifdef CONFIG_IPV6_SUBTREES
3163 if (src) {
3164 if (nla_put_in6_addr(skb, RTA_SRC, src))
3165 goto nla_put_failure;
3166 rtm->rtm_src_len = 128;
3167 } else if (rtm->rtm_src_len &&
3168 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3169 goto nla_put_failure;
3170 #endif
3171 if (iif) {
3172 #ifdef CONFIG_IPV6_MROUTE
3173 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3174 int err = ip6mr_get_route(net, skb, rtm, nowait);
3175 if (err <= 0) {
3176 if (!nowait) {
3177 if (err == 0)
3178 return 0;
3179 goto nla_put_failure;
3180 } else {
3181 if (err == -EMSGSIZE)
3182 goto nla_put_failure;
3183 }
3184 }
3185 } else
3186 #endif
3187 if (nla_put_u32(skb, RTA_IIF, iif))
3188 goto nla_put_failure;
3189 } else if (dst) {
3190 struct in6_addr saddr_buf;
3191 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3192 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3193 goto nla_put_failure;
3194 }
3195
3196 if (rt->rt6i_prefsrc.plen) {
3197 struct in6_addr saddr_buf;
3198 saddr_buf = rt->rt6i_prefsrc.addr;
3199 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3200 goto nla_put_failure;
3201 }
3202
3203 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3204 if (rt->rt6i_pmtu)
3205 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3206 if (rtnetlink_put_metrics(skb, metrics) < 0)
3207 goto nla_put_failure;
3208
3209 if (rt->rt6i_flags & RTF_GATEWAY) {
3210 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3211 goto nla_put_failure;
3212 }
3213
3214 if (rt->dst.dev &&
3215 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3216 goto nla_put_failure;
3217 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3218 goto nla_put_failure;
3219
3220 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3221
3222 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3223 goto nla_put_failure;
3224
3225 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3226 goto nla_put_failure;
3227
3228 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3229
3230 nlmsg_end(skb, nlh);
3231 return 0;
3232
3233 nla_put_failure:
3234 nlmsg_cancel(skb, nlh);
3235 return -EMSGSIZE;
3236 }
3237
3238 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3239 {
3240 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3241 int prefix;
3242
3243 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3244 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3245 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3246 } else
3247 prefix = 0;
3248
3249 return rt6_fill_node(arg->net,
3250 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3251 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3252 prefix, 0, NLM_F_MULTI);
3253 }
3254
3255 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3256 {
3257 struct net *net = sock_net(in_skb->sk);
3258 struct nlattr *tb[RTA_MAX+1];
3259 struct rt6_info *rt;
3260 struct sk_buff *skb;
3261 struct rtmsg *rtm;
3262 struct flowi6 fl6;
3263 int err, iif = 0, oif = 0;
3264
3265 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3266 if (err < 0)
3267 goto errout;
3268
3269 err = -EINVAL;
3270 memset(&fl6, 0, sizeof(fl6));
3271
3272 if (tb[RTA_SRC]) {
3273 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3274 goto errout;
3275
3276 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3277 }
3278
3279 if (tb[RTA_DST]) {
3280 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3281 goto errout;
3282
3283 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3284 }
3285
3286 if (tb[RTA_IIF])
3287 iif = nla_get_u32(tb[RTA_IIF]);
3288
3289 if (tb[RTA_OIF])
3290 oif = nla_get_u32(tb[RTA_OIF]);
3291
3292 if (tb[RTA_MARK])
3293 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3294
3295 if (iif) {
3296 struct net_device *dev;
3297 int flags = 0;
3298
3299 dev = __dev_get_by_index(net, iif);
3300 if (!dev) {
3301 err = -ENODEV;
3302 goto errout;
3303 }
3304
3305 fl6.flowi6_iif = iif;
3306
3307 if (!ipv6_addr_any(&fl6.saddr))
3308 flags |= RT6_LOOKUP_F_HAS_SADDR;
3309
3310 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3311 flags);
3312 } else {
3313 fl6.flowi6_oif = oif;
3314
3315 if (netif_index_is_l3_master(net, oif)) {
3316 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3317 FLOWI_FLAG_SKIP_NH_OIF;
3318 }
3319
3320 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3321 }
3322
3323 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3324 if (!skb) {
3325 ip6_rt_put(rt);
3326 err = -ENOBUFS;
3327 goto errout;
3328 }
3329
3330 /* Reserve room for dummy headers, this skb can pass
3331 through good chunk of routing engine.
3332 */
3333 skb_reset_mac_header(skb);
3334 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3335
3336 skb_dst_set(skb, &rt->dst);
3337
3338 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3339 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3340 nlh->nlmsg_seq, 0, 0, 0);
3341 if (err < 0) {
3342 kfree_skb(skb);
3343 goto errout;
3344 }
3345
3346 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3347 errout:
3348 return err;
3349 }
3350
3351 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3352 unsigned int nlm_flags)
3353 {
3354 struct sk_buff *skb;
3355 struct net *net = info->nl_net;
3356 u32 seq;
3357 int err;
3358
3359 err = -ENOBUFS;
3360 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3361
3362 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3363 if (!skb)
3364 goto errout;
3365
3366 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3367 event, info->portid, seq, 0, 0, nlm_flags);
3368 if (err < 0) {
3369 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3370 WARN_ON(err == -EMSGSIZE);
3371 kfree_skb(skb);
3372 goto errout;
3373 }
3374 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3375 info->nlh, gfp_any());
3376 return;
3377 errout:
3378 if (err < 0)
3379 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3380 }
3381
3382 static int ip6_route_dev_notify(struct notifier_block *this,
3383 unsigned long event, void *ptr)
3384 {
3385 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3386 struct net *net = dev_net(dev);
3387
3388 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3389 net->ipv6.ip6_null_entry->dst.dev = dev;
3390 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3391 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3392 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3393 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3394 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3395 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3396 #endif
3397 }
3398
3399 return NOTIFY_OK;
3400 }
3401
3402 /*
3403 * /proc
3404 */
3405
3406 #ifdef CONFIG_PROC_FS
3407
3408 static const struct file_operations ipv6_route_proc_fops = {
3409 .owner = THIS_MODULE,
3410 .open = ipv6_route_open,
3411 .read = seq_read,
3412 .llseek = seq_lseek,
3413 .release = seq_release_net,
3414 };
3415
3416 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3417 {
3418 struct net *net = (struct net *)seq->private;
3419 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3420 net->ipv6.rt6_stats->fib_nodes,
3421 net->ipv6.rt6_stats->fib_route_nodes,
3422 net->ipv6.rt6_stats->fib_rt_alloc,
3423 net->ipv6.rt6_stats->fib_rt_entries,
3424 net->ipv6.rt6_stats->fib_rt_cache,
3425 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3426 net->ipv6.rt6_stats->fib_discarded_routes);
3427
3428 return 0;
3429 }
3430
3431 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3432 {
3433 return single_open_net(inode, file, rt6_stats_seq_show);
3434 }
3435
3436 static const struct file_operations rt6_stats_seq_fops = {
3437 .owner = THIS_MODULE,
3438 .open = rt6_stats_seq_open,
3439 .read = seq_read,
3440 .llseek = seq_lseek,
3441 .release = single_release_net,
3442 };
3443 #endif /* CONFIG_PROC_FS */
3444
3445 #ifdef CONFIG_SYSCTL
3446
3447 static
3448 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3449 void __user *buffer, size_t *lenp, loff_t *ppos)
3450 {
3451 struct net *net;
3452 int delay;
3453 if (!write)
3454 return -EINVAL;
3455
3456 net = (struct net *)ctl->extra1;
3457 delay = net->ipv6.sysctl.flush_delay;
3458 proc_dointvec(ctl, write, buffer, lenp, ppos);
3459 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3460 return 0;
3461 }
3462
3463 struct ctl_table ipv6_route_table_template[] = {
3464 {
3465 .procname = "flush",
3466 .data = &init_net.ipv6.sysctl.flush_delay,
3467 .maxlen = sizeof(int),
3468 .mode = 0200,
3469 .proc_handler = ipv6_sysctl_rtcache_flush
3470 },
3471 {
3472 .procname = "gc_thresh",
3473 .data = &ip6_dst_ops_template.gc_thresh,
3474 .maxlen = sizeof(int),
3475 .mode = 0644,
3476 .proc_handler = proc_dointvec,
3477 },
3478 {
3479 .procname = "max_size",
3480 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3481 .maxlen = sizeof(int),
3482 .mode = 0644,
3483 .proc_handler = proc_dointvec,
3484 },
3485 {
3486 .procname = "gc_min_interval",
3487 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3488 .maxlen = sizeof(int),
3489 .mode = 0644,
3490 .proc_handler = proc_dointvec_jiffies,
3491 },
3492 {
3493 .procname = "gc_timeout",
3494 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3495 .maxlen = sizeof(int),
3496 .mode = 0644,
3497 .proc_handler = proc_dointvec_jiffies,
3498 },
3499 {
3500 .procname = "gc_interval",
3501 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3502 .maxlen = sizeof(int),
3503 .mode = 0644,
3504 .proc_handler = proc_dointvec_jiffies,
3505 },
3506 {
3507 .procname = "gc_elasticity",
3508 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3509 .maxlen = sizeof(int),
3510 .mode = 0644,
3511 .proc_handler = proc_dointvec,
3512 },
3513 {
3514 .procname = "mtu_expires",
3515 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3516 .maxlen = sizeof(int),
3517 .mode = 0644,
3518 .proc_handler = proc_dointvec_jiffies,
3519 },
3520 {
3521 .procname = "min_adv_mss",
3522 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3523 .maxlen = sizeof(int),
3524 .mode = 0644,
3525 .proc_handler = proc_dointvec,
3526 },
3527 {
3528 .procname = "gc_min_interval_ms",
3529 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3530 .maxlen = sizeof(int),
3531 .mode = 0644,
3532 .proc_handler = proc_dointvec_ms_jiffies,
3533 },
3534 { }
3535 };
3536
3537 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3538 {
3539 struct ctl_table *table;
3540
3541 table = kmemdup(ipv6_route_table_template,
3542 sizeof(ipv6_route_table_template),
3543 GFP_KERNEL);
3544
3545 if (table) {
3546 table[0].data = &net->ipv6.sysctl.flush_delay;
3547 table[0].extra1 = net;
3548 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3549 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3550 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3551 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3552 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3553 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3554 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3555 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3556 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3557
3558 /* Don't export sysctls to unprivileged users */
3559 if (net->user_ns != &init_user_ns)
3560 table[0].procname = NULL;
3561 }
3562
3563 return table;
3564 }
3565 #endif
3566
3567 static int __net_init ip6_route_net_init(struct net *net)
3568 {
3569 int ret = -ENOMEM;
3570
3571 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3572 sizeof(net->ipv6.ip6_dst_ops));
3573
3574 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3575 goto out_ip6_dst_ops;
3576
3577 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3578 sizeof(*net->ipv6.ip6_null_entry),
3579 GFP_KERNEL);
3580 if (!net->ipv6.ip6_null_entry)
3581 goto out_ip6_dst_entries;
3582 net->ipv6.ip6_null_entry->dst.path =
3583 (struct dst_entry *)net->ipv6.ip6_null_entry;
3584 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3585 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3586 ip6_template_metrics, true);
3587
3588 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3589 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3590 sizeof(*net->ipv6.ip6_prohibit_entry),
3591 GFP_KERNEL);
3592 if (!net->ipv6.ip6_prohibit_entry)
3593 goto out_ip6_null_entry;
3594 net->ipv6.ip6_prohibit_entry->dst.path =
3595 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3596 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3597 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3598 ip6_template_metrics, true);
3599
3600 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3601 sizeof(*net->ipv6.ip6_blk_hole_entry),
3602 GFP_KERNEL);
3603 if (!net->ipv6.ip6_blk_hole_entry)
3604 goto out_ip6_prohibit_entry;
3605 net->ipv6.ip6_blk_hole_entry->dst.path =
3606 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3607 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3608 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3609 ip6_template_metrics, true);
3610 #endif
3611
3612 net->ipv6.sysctl.flush_delay = 0;
3613 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3614 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3615 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3616 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3617 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3618 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3619 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3620
3621 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3622
3623 ret = 0;
3624 out:
3625 return ret;
3626
3627 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3628 out_ip6_prohibit_entry:
3629 kfree(net->ipv6.ip6_prohibit_entry);
3630 out_ip6_null_entry:
3631 kfree(net->ipv6.ip6_null_entry);
3632 #endif
3633 out_ip6_dst_entries:
3634 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3635 out_ip6_dst_ops:
3636 goto out;
3637 }
3638
3639 static void __net_exit ip6_route_net_exit(struct net *net)
3640 {
3641 kfree(net->ipv6.ip6_null_entry);
3642 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3643 kfree(net->ipv6.ip6_prohibit_entry);
3644 kfree(net->ipv6.ip6_blk_hole_entry);
3645 #endif
3646 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3647 }
3648
3649 static int __net_init ip6_route_net_init_late(struct net *net)
3650 {
3651 #ifdef CONFIG_PROC_FS
3652 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3653 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3654 #endif
3655 return 0;
3656 }
3657
3658 static void __net_exit ip6_route_net_exit_late(struct net *net)
3659 {
3660 #ifdef CONFIG_PROC_FS
3661 remove_proc_entry("ipv6_route", net->proc_net);
3662 remove_proc_entry("rt6_stats", net->proc_net);
3663 #endif
3664 }
3665
3666 static struct pernet_operations ip6_route_net_ops = {
3667 .init = ip6_route_net_init,
3668 .exit = ip6_route_net_exit,
3669 };
3670
3671 static int __net_init ipv6_inetpeer_init(struct net *net)
3672 {
3673 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3674
3675 if (!bp)
3676 return -ENOMEM;
3677 inet_peer_base_init(bp);
3678 net->ipv6.peers = bp;
3679 return 0;
3680 }
3681
3682 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3683 {
3684 struct inet_peer_base *bp = net->ipv6.peers;
3685
3686 net->ipv6.peers = NULL;
3687 inetpeer_invalidate_tree(bp);
3688 kfree(bp);
3689 }
3690
3691 static struct pernet_operations ipv6_inetpeer_ops = {
3692 .init = ipv6_inetpeer_init,
3693 .exit = ipv6_inetpeer_exit,
3694 };
3695
3696 static struct pernet_operations ip6_route_net_late_ops = {
3697 .init = ip6_route_net_init_late,
3698 .exit = ip6_route_net_exit_late,
3699 };
3700
3701 static struct notifier_block ip6_route_dev_notifier = {
3702 .notifier_call = ip6_route_dev_notify,
3703 .priority = 0,
3704 };
3705
3706 int __init ip6_route_init(void)
3707 {
3708 int ret;
3709 int cpu;
3710
3711 ret = -ENOMEM;
3712 ip6_dst_ops_template.kmem_cachep =
3713 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3714 SLAB_HWCACHE_ALIGN, NULL);
3715 if (!ip6_dst_ops_template.kmem_cachep)
3716 goto out;
3717
3718 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3719 if (ret)
3720 goto out_kmem_cache;
3721
3722 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3723 if (ret)
3724 goto out_dst_entries;
3725
3726 ret = register_pernet_subsys(&ip6_route_net_ops);
3727 if (ret)
3728 goto out_register_inetpeer;
3729
3730 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3731
3732 /* Registering of the loopback is done before this portion of code,
3733 * the loopback reference in rt6_info will not be taken, do it
3734 * manually for init_net */
3735 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3736 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3737 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3738 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3739 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3740 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3741 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3742 #endif
3743 ret = fib6_init();
3744 if (ret)
3745 goto out_register_subsys;
3746
3747 ret = xfrm6_init();
3748 if (ret)
3749 goto out_fib6_init;
3750
3751 ret = fib6_rules_init();
3752 if (ret)
3753 goto xfrm6_init;
3754
3755 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3756 if (ret)
3757 goto fib6_rules_init;
3758
3759 ret = -ENOBUFS;
3760 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3761 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3762 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3763 goto out_register_late_subsys;
3764
3765 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3766 if (ret)
3767 goto out_register_late_subsys;
3768
3769 for_each_possible_cpu(cpu) {
3770 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3771
3772 INIT_LIST_HEAD(&ul->head);
3773 spin_lock_init(&ul->lock);
3774 }
3775
3776 out:
3777 return ret;
3778
3779 out_register_late_subsys:
3780 unregister_pernet_subsys(&ip6_route_net_late_ops);
3781 fib6_rules_init:
3782 fib6_rules_cleanup();
3783 xfrm6_init:
3784 xfrm6_fini();
3785 out_fib6_init:
3786 fib6_gc_cleanup();
3787 out_register_subsys:
3788 unregister_pernet_subsys(&ip6_route_net_ops);
3789 out_register_inetpeer:
3790 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3791 out_dst_entries:
3792 dst_entries_destroy(&ip6_dst_blackhole_ops);
3793 out_kmem_cache:
3794 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3795 goto out;
3796 }
3797
3798 void ip6_route_cleanup(void)
3799 {
3800 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3801 unregister_pernet_subsys(&ip6_route_net_late_ops);
3802 fib6_rules_cleanup();
3803 xfrm6_fini();
3804 fib6_gc_cleanup();
3805 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3806 unregister_pernet_subsys(&ip6_route_net_ops);
3807 dst_entries_destroy(&ip6_dst_blackhole_ops);
3808 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3809 }
Linux kernel - Deliverables
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