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[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 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1046 int oif, struct flowi6 *fl6, int flags)
1047 {
1048 struct fib6_node *fn, *saved_fn;
1049 struct rt6_info *rt;
1050 int strict = 0;
1051
1052 strict |= flags & RT6_LOOKUP_F_IFACE;
1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1055
1056 read_lock_bh(&table->tb6_lock);
1057
1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1059 saved_fn = fn;
1060
1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
1064 redo_rt6_select:
1065 rt = rt6_select(fn, oif, strict);
1066 if (rt->rt6i_nsiblings)
1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
1077 }
1078 }
1079
1080
1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1088 return rt;
1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
1104
1105 if (uncached_rt)
1106 rt6_uncached_list_add(uncached_rt);
1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
1109
1110 dst_hold(&uncached_rt->dst);
1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
1113 return uncached_rt;
1114
1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
1123
1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
1133 pcpu_rt = rt6_make_pcpu_route(rt);
1134 dst_release(&rt->dst);
1135 }
1136
1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
1138 return pcpu_rt;
1139
1140 }
1141 }
1142 EXPORT_SYMBOL_GPL(ip6_pol_route);
1143
1144 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1145 struct flowi6 *fl6, int flags)
1146 {
1147 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1148 }
1149
1150 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1151 struct net_device *dev,
1152 struct flowi6 *fl6, int flags)
1153 {
1154 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1155 flags |= RT6_LOOKUP_F_IFACE;
1156
1157 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1158 }
1159
1160 void ip6_route_input(struct sk_buff *skb)
1161 {
1162 const struct ipv6hdr *iph = ipv6_hdr(skb);
1163 struct net *net = dev_net(skb->dev);
1164 int flags = RT6_LOOKUP_F_HAS_SADDR;
1165 struct ip_tunnel_info *tun_info;
1166 struct flowi6 fl6 = {
1167 .flowi6_iif = skb->dev->ifindex,
1168 .daddr = iph->daddr,
1169 .saddr = iph->saddr,
1170 .flowlabel = ip6_flowinfo(iph),
1171 .flowi6_mark = skb->mark,
1172 .flowi6_proto = iph->nexthdr,
1173 };
1174
1175 tun_info = skb_tunnel_info(skb);
1176 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1177 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1178 skb_dst_drop(skb);
1179 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1180 }
1181
1182 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1183 struct flowi6 *fl6, int flags)
1184 {
1185 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1186 }
1187
1188 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1189 struct flowi6 *fl6, int flags)
1190 {
1191 bool any_src;
1192
1193 if (rt6_need_strict(&fl6->daddr)) {
1194 struct dst_entry *dst;
1195
1196 dst = l3mdev_link_scope_lookup(net, fl6);
1197 if (dst)
1198 return dst;
1199 }
1200
1201 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1202
1203 any_src = ipv6_addr_any(&fl6->saddr);
1204 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1205 (fl6->flowi6_oif && any_src))
1206 flags |= RT6_LOOKUP_F_IFACE;
1207
1208 if (!any_src)
1209 flags |= RT6_LOOKUP_F_HAS_SADDR;
1210 else if (sk)
1211 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1212
1213 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1214 }
1215 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1216
1217 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1218 {
1219 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1220 struct dst_entry *new = NULL;
1221
1222 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1223 if (rt) {
1224 rt6_info_init(rt);
1225
1226 new = &rt->dst;
1227 new->__use = 1;
1228 new->input = dst_discard;
1229 new->output = dst_discard_out;
1230
1231 dst_copy_metrics(new, &ort->dst);
1232 rt->rt6i_idev = ort->rt6i_idev;
1233 if (rt->rt6i_idev)
1234 in6_dev_hold(rt->rt6i_idev);
1235
1236 rt->rt6i_gateway = ort->rt6i_gateway;
1237 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1238 rt->rt6i_metric = 0;
1239
1240 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1241 #ifdef CONFIG_IPV6_SUBTREES
1242 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1243 #endif
1244
1245 dst_free(new);
1246 }
1247
1248 dst_release(dst_orig);
1249 return new ? new : ERR_PTR(-ENOMEM);
1250 }
1251
1252 /*
1253 * Destination cache support functions
1254 */
1255
1256 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1257 {
1258 if (rt->dst.from &&
1259 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1260 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1261 }
1262
1263 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1264 {
1265 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1266 return NULL;
1267
1268 if (rt6_check_expired(rt))
1269 return NULL;
1270
1271 return &rt->dst;
1272 }
1273
1274 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1275 {
1276 if (!__rt6_check_expired(rt) &&
1277 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1278 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1279 return &rt->dst;
1280 else
1281 return NULL;
1282 }
1283
1284 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1285 {
1286 struct rt6_info *rt;
1287
1288 rt = (struct rt6_info *) dst;
1289
1290 /* All IPV6 dsts are created with ->obsolete set to the value
1291 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1292 * into this function always.
1293 */
1294
1295 rt6_dst_from_metrics_check(rt);
1296
1297 if (rt->rt6i_flags & RTF_PCPU ||
1298 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1299 return rt6_dst_from_check(rt, cookie);
1300 else
1301 return rt6_check(rt, cookie);
1302 }
1303
1304 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1305 {
1306 struct rt6_info *rt = (struct rt6_info *) dst;
1307
1308 if (rt) {
1309 if (rt->rt6i_flags & RTF_CACHE) {
1310 if (rt6_check_expired(rt)) {
1311 ip6_del_rt(rt);
1312 dst = NULL;
1313 }
1314 } else {
1315 dst_release(dst);
1316 dst = NULL;
1317 }
1318 }
1319 return dst;
1320 }
1321
1322 static void ip6_link_failure(struct sk_buff *skb)
1323 {
1324 struct rt6_info *rt;
1325
1326 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1327
1328 rt = (struct rt6_info *) skb_dst(skb);
1329 if (rt) {
1330 if (rt->rt6i_flags & RTF_CACHE) {
1331 dst_hold(&rt->dst);
1332 ip6_del_rt(rt);
1333 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1334 rt->rt6i_node->fn_sernum = -1;
1335 }
1336 }
1337 }
1338
1339 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1340 {
1341 struct net *net = dev_net(rt->dst.dev);
1342
1343 rt->rt6i_flags |= RTF_MODIFIED;
1344 rt->rt6i_pmtu = mtu;
1345 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1346 }
1347
1348 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1349 {
1350 return !(rt->rt6i_flags & RTF_CACHE) &&
1351 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1352 }
1353
1354 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1355 const struct ipv6hdr *iph, u32 mtu)
1356 {
1357 struct rt6_info *rt6 = (struct rt6_info *)dst;
1358
1359 if (rt6->rt6i_flags & RTF_LOCAL)
1360 return;
1361
1362 dst_confirm(dst);
1363 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1364 if (mtu >= dst_mtu(dst))
1365 return;
1366
1367 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1368 rt6_do_update_pmtu(rt6, mtu);
1369 } else {
1370 const struct in6_addr *daddr, *saddr;
1371 struct rt6_info *nrt6;
1372
1373 if (iph) {
1374 daddr = &iph->daddr;
1375 saddr = &iph->saddr;
1376 } else if (sk) {
1377 daddr = &sk->sk_v6_daddr;
1378 saddr = &inet6_sk(sk)->saddr;
1379 } else {
1380 return;
1381 }
1382 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1383 if (nrt6) {
1384 rt6_do_update_pmtu(nrt6, mtu);
1385
1386 /* ip6_ins_rt(nrt6) will bump the
1387 * rt6->rt6i_node->fn_sernum
1388 * which will fail the next rt6_check() and
1389 * invalidate the sk->sk_dst_cache.
1390 */
1391 ip6_ins_rt(nrt6);
1392 }
1393 }
1394 }
1395
1396 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1397 struct sk_buff *skb, u32 mtu)
1398 {
1399 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1400 }
1401
1402 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1403 int oif, u32 mark)
1404 {
1405 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1406 struct dst_entry *dst;
1407 struct flowi6 fl6;
1408
1409 memset(&fl6, 0, sizeof(fl6));
1410 fl6.flowi6_oif = oif;
1411 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1412 fl6.daddr = iph->daddr;
1413 fl6.saddr = iph->saddr;
1414 fl6.flowlabel = ip6_flowinfo(iph);
1415
1416 dst = ip6_route_output(net, NULL, &fl6);
1417 if (!dst->error)
1418 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1419 dst_release(dst);
1420 }
1421 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1422
1423 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1424 {
1425 struct dst_entry *dst;
1426
1427 ip6_update_pmtu(skb, sock_net(sk), mtu,
1428 sk->sk_bound_dev_if, sk->sk_mark);
1429
1430 dst = __sk_dst_get(sk);
1431 if (!dst || !dst->obsolete ||
1432 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1433 return;
1434
1435 bh_lock_sock(sk);
1436 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1437 ip6_datagram_dst_update(sk, false);
1438 bh_unlock_sock(sk);
1439 }
1440 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1441
1442 /* Handle redirects */
1443 struct ip6rd_flowi {
1444 struct flowi6 fl6;
1445 struct in6_addr gateway;
1446 };
1447
1448 static struct rt6_info *__ip6_route_redirect(struct net *net,
1449 struct fib6_table *table,
1450 struct flowi6 *fl6,
1451 int flags)
1452 {
1453 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1454 struct rt6_info *rt;
1455 struct fib6_node *fn;
1456
1457 /* Get the "current" route for this destination and
1458 * check if the redirect has come from approriate router.
1459 *
1460 * RFC 4861 specifies that redirects should only be
1461 * accepted if they come from the nexthop to the target.
1462 * Due to the way the routes are chosen, this notion
1463 * is a bit fuzzy and one might need to check all possible
1464 * routes.
1465 */
1466
1467 read_lock_bh(&table->tb6_lock);
1468 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1469 restart:
1470 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1471 if (rt6_check_expired(rt))
1472 continue;
1473 if (rt->dst.error)
1474 break;
1475 if (!(rt->rt6i_flags & RTF_GATEWAY))
1476 continue;
1477 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1478 continue;
1479 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1480 continue;
1481 break;
1482 }
1483
1484 if (!rt)
1485 rt = net->ipv6.ip6_null_entry;
1486 else if (rt->dst.error) {
1487 rt = net->ipv6.ip6_null_entry;
1488 goto out;
1489 }
1490
1491 if (rt == net->ipv6.ip6_null_entry) {
1492 fn = fib6_backtrack(fn, &fl6->saddr);
1493 if (fn)
1494 goto restart;
1495 }
1496
1497 out:
1498 dst_hold(&rt->dst);
1499
1500 read_unlock_bh(&table->tb6_lock);
1501
1502 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1503 return rt;
1504 };
1505
1506 static struct dst_entry *ip6_route_redirect(struct net *net,
1507 const struct flowi6 *fl6,
1508 const struct in6_addr *gateway)
1509 {
1510 int flags = RT6_LOOKUP_F_HAS_SADDR;
1511 struct ip6rd_flowi rdfl;
1512
1513 rdfl.fl6 = *fl6;
1514 rdfl.gateway = *gateway;
1515
1516 return fib6_rule_lookup(net, &rdfl.fl6,
1517 flags, __ip6_route_redirect);
1518 }
1519
1520 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1521 {
1522 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1523 struct dst_entry *dst;
1524 struct flowi6 fl6;
1525
1526 memset(&fl6, 0, sizeof(fl6));
1527 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1528 fl6.flowi6_oif = oif;
1529 fl6.flowi6_mark = mark;
1530 fl6.daddr = iph->daddr;
1531 fl6.saddr = iph->saddr;
1532 fl6.flowlabel = ip6_flowinfo(iph);
1533
1534 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1535 rt6_do_redirect(dst, NULL, skb);
1536 dst_release(dst);
1537 }
1538 EXPORT_SYMBOL_GPL(ip6_redirect);
1539
1540 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1541 u32 mark)
1542 {
1543 const struct ipv6hdr *iph = ipv6_hdr(skb);
1544 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1545 struct dst_entry *dst;
1546 struct flowi6 fl6;
1547
1548 memset(&fl6, 0, sizeof(fl6));
1549 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1550 fl6.flowi6_oif = oif;
1551 fl6.flowi6_mark = mark;
1552 fl6.daddr = msg->dest;
1553 fl6.saddr = iph->daddr;
1554
1555 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1556 rt6_do_redirect(dst, NULL, skb);
1557 dst_release(dst);
1558 }
1559
1560 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1561 {
1562 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1563 }
1564 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1565
1566 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1567 {
1568 struct net_device *dev = dst->dev;
1569 unsigned int mtu = dst_mtu(dst);
1570 struct net *net = dev_net(dev);
1571
1572 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1573
1574 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1575 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1576
1577 /*
1578 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1579 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1580 * IPV6_MAXPLEN is also valid and means: "any MSS,
1581 * rely only on pmtu discovery"
1582 */
1583 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1584 mtu = IPV6_MAXPLEN;
1585 return mtu;
1586 }
1587
1588 static unsigned int ip6_mtu(const struct dst_entry *dst)
1589 {
1590 const struct rt6_info *rt = (const struct rt6_info *)dst;
1591 unsigned int mtu = rt->rt6i_pmtu;
1592 struct inet6_dev *idev;
1593
1594 if (mtu)
1595 goto out;
1596
1597 mtu = dst_metric_raw(dst, RTAX_MTU);
1598 if (mtu)
1599 goto out;
1600
1601 mtu = IPV6_MIN_MTU;
1602
1603 rcu_read_lock();
1604 idev = __in6_dev_get(dst->dev);
1605 if (idev)
1606 mtu = idev->cnf.mtu6;
1607 rcu_read_unlock();
1608
1609 out:
1610 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1611
1612 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
1613 }
1614
1615 static struct dst_entry *icmp6_dst_gc_list;
1616 static DEFINE_SPINLOCK(icmp6_dst_lock);
1617
1618 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1619 struct flowi6 *fl6)
1620 {
1621 struct dst_entry *dst;
1622 struct rt6_info *rt;
1623 struct inet6_dev *idev = in6_dev_get(dev);
1624 struct net *net = dev_net(dev);
1625
1626 if (unlikely(!idev))
1627 return ERR_PTR(-ENODEV);
1628
1629 rt = ip6_dst_alloc(net, dev, 0);
1630 if (unlikely(!rt)) {
1631 in6_dev_put(idev);
1632 dst = ERR_PTR(-ENOMEM);
1633 goto out;
1634 }
1635
1636 rt->dst.flags |= DST_HOST;
1637 rt->dst.output = ip6_output;
1638 atomic_set(&rt->dst.__refcnt, 1);
1639 rt->rt6i_gateway = fl6->daddr;
1640 rt->rt6i_dst.addr = fl6->daddr;
1641 rt->rt6i_dst.plen = 128;
1642 rt->rt6i_idev = idev;
1643 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1644
1645 spin_lock_bh(&icmp6_dst_lock);
1646 rt->dst.next = icmp6_dst_gc_list;
1647 icmp6_dst_gc_list = &rt->dst;
1648 spin_unlock_bh(&icmp6_dst_lock);
1649
1650 fib6_force_start_gc(net);
1651
1652 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1653
1654 out:
1655 return dst;
1656 }
1657
1658 int icmp6_dst_gc(void)
1659 {
1660 struct dst_entry *dst, **pprev;
1661 int more = 0;
1662
1663 spin_lock_bh(&icmp6_dst_lock);
1664 pprev = &icmp6_dst_gc_list;
1665
1666 while ((dst = *pprev) != NULL) {
1667 if (!atomic_read(&dst->__refcnt)) {
1668 *pprev = dst->next;
1669 dst_free(dst);
1670 } else {
1671 pprev = &dst->next;
1672 ++more;
1673 }
1674 }
1675
1676 spin_unlock_bh(&icmp6_dst_lock);
1677
1678 return more;
1679 }
1680
1681 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1682 void *arg)
1683 {
1684 struct dst_entry *dst, **pprev;
1685
1686 spin_lock_bh(&icmp6_dst_lock);
1687 pprev = &icmp6_dst_gc_list;
1688 while ((dst = *pprev) != NULL) {
1689 struct rt6_info *rt = (struct rt6_info *) dst;
1690 if (func(rt, arg)) {
1691 *pprev = dst->next;
1692 dst_free(dst);
1693 } else {
1694 pprev = &dst->next;
1695 }
1696 }
1697 spin_unlock_bh(&icmp6_dst_lock);
1698 }
1699
1700 static int ip6_dst_gc(struct dst_ops *ops)
1701 {
1702 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1703 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1704 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1705 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1706 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1707 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1708 int entries;
1709
1710 entries = dst_entries_get_fast(ops);
1711 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1712 entries <= rt_max_size)
1713 goto out;
1714
1715 net->ipv6.ip6_rt_gc_expire++;
1716 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1717 entries = dst_entries_get_slow(ops);
1718 if (entries < ops->gc_thresh)
1719 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1720 out:
1721 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1722 return entries > rt_max_size;
1723 }
1724
1725 static int ip6_convert_metrics(struct mx6_config *mxc,
1726 const struct fib6_config *cfg)
1727 {
1728 bool ecn_ca = false;
1729 struct nlattr *nla;
1730 int remaining;
1731 u32 *mp;
1732
1733 if (!cfg->fc_mx)
1734 return 0;
1735
1736 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1737 if (unlikely(!mp))
1738 return -ENOMEM;
1739
1740 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1741 int type = nla_type(nla);
1742 u32 val;
1743
1744 if (!type)
1745 continue;
1746 if (unlikely(type > RTAX_MAX))
1747 goto err;
1748
1749 if (type == RTAX_CC_ALGO) {
1750 char tmp[TCP_CA_NAME_MAX];
1751
1752 nla_strlcpy(tmp, nla, sizeof(tmp));
1753 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1754 if (val == TCP_CA_UNSPEC)
1755 goto err;
1756 } else {
1757 val = nla_get_u32(nla);
1758 }
1759 if (type == RTAX_HOPLIMIT && val > 255)
1760 val = 255;
1761 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1762 goto err;
1763
1764 mp[type - 1] = val;
1765 __set_bit(type - 1, mxc->mx_valid);
1766 }
1767
1768 if (ecn_ca) {
1769 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1770 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1771 }
1772
1773 mxc->mx = mp;
1774 return 0;
1775 err:
1776 kfree(mp);
1777 return -EINVAL;
1778 }
1779
1780 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1781 struct fib6_config *cfg,
1782 const struct in6_addr *gw_addr)
1783 {
1784 struct flowi6 fl6 = {
1785 .flowi6_oif = cfg->fc_ifindex,
1786 .daddr = *gw_addr,
1787 .saddr = cfg->fc_prefsrc,
1788 };
1789 struct fib6_table *table;
1790 struct rt6_info *rt;
1791 int flags = RT6_LOOKUP_F_IFACE;
1792
1793 table = fib6_get_table(net, cfg->fc_table);
1794 if (!table)
1795 return NULL;
1796
1797 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1798 flags |= RT6_LOOKUP_F_HAS_SADDR;
1799
1800 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1801
1802 /* if table lookup failed, fall back to full lookup */
1803 if (rt == net->ipv6.ip6_null_entry) {
1804 ip6_rt_put(rt);
1805 rt = NULL;
1806 }
1807
1808 return rt;
1809 }
1810
1811 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1812 {
1813 struct net *net = cfg->fc_nlinfo.nl_net;
1814 struct rt6_info *rt = NULL;
1815 struct net_device *dev = NULL;
1816 struct inet6_dev *idev = NULL;
1817 struct fib6_table *table;
1818 int addr_type;
1819 int err = -EINVAL;
1820
1821 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1822 goto out;
1823 #ifndef CONFIG_IPV6_SUBTREES
1824 if (cfg->fc_src_len)
1825 goto out;
1826 #endif
1827 if (cfg->fc_ifindex) {
1828 err = -ENODEV;
1829 dev = dev_get_by_index(net, cfg->fc_ifindex);
1830 if (!dev)
1831 goto out;
1832 idev = in6_dev_get(dev);
1833 if (!idev)
1834 goto out;
1835 }
1836
1837 if (cfg->fc_metric == 0)
1838 cfg->fc_metric = IP6_RT_PRIO_USER;
1839
1840 err = -ENOBUFS;
1841 if (cfg->fc_nlinfo.nlh &&
1842 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1843 table = fib6_get_table(net, cfg->fc_table);
1844 if (!table) {
1845 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1846 table = fib6_new_table(net, cfg->fc_table);
1847 }
1848 } else {
1849 table = fib6_new_table(net, cfg->fc_table);
1850 }
1851
1852 if (!table)
1853 goto out;
1854
1855 rt = ip6_dst_alloc(net, NULL,
1856 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1857
1858 if (!rt) {
1859 err = -ENOMEM;
1860 goto out;
1861 }
1862
1863 if (cfg->fc_flags & RTF_EXPIRES)
1864 rt6_set_expires(rt, jiffies +
1865 clock_t_to_jiffies(cfg->fc_expires));
1866 else
1867 rt6_clean_expires(rt);
1868
1869 if (cfg->fc_protocol == RTPROT_UNSPEC)
1870 cfg->fc_protocol = RTPROT_BOOT;
1871 rt->rt6i_protocol = cfg->fc_protocol;
1872
1873 addr_type = ipv6_addr_type(&cfg->fc_dst);
1874
1875 if (addr_type & IPV6_ADDR_MULTICAST)
1876 rt->dst.input = ip6_mc_input;
1877 else if (cfg->fc_flags & RTF_LOCAL)
1878 rt->dst.input = ip6_input;
1879 else
1880 rt->dst.input = ip6_forward;
1881
1882 rt->dst.output = ip6_output;
1883
1884 if (cfg->fc_encap) {
1885 struct lwtunnel_state *lwtstate;
1886
1887 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1888 cfg->fc_encap, AF_INET6, cfg,
1889 &lwtstate);
1890 if (err)
1891 goto out;
1892 rt->dst.lwtstate = lwtstate_get(lwtstate);
1893 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1894 rt->dst.lwtstate->orig_output = rt->dst.output;
1895 rt->dst.output = lwtunnel_output;
1896 }
1897 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1898 rt->dst.lwtstate->orig_input = rt->dst.input;
1899 rt->dst.input = lwtunnel_input;
1900 }
1901 }
1902
1903 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1904 rt->rt6i_dst.plen = cfg->fc_dst_len;
1905 if (rt->rt6i_dst.plen == 128)
1906 rt->dst.flags |= DST_HOST;
1907
1908 #ifdef CONFIG_IPV6_SUBTREES
1909 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1910 rt->rt6i_src.plen = cfg->fc_src_len;
1911 #endif
1912
1913 rt->rt6i_metric = cfg->fc_metric;
1914
1915 /* We cannot add true routes via loopback here,
1916 they would result in kernel looping; promote them to reject routes
1917 */
1918 if ((cfg->fc_flags & RTF_REJECT) ||
1919 (dev && (dev->flags & IFF_LOOPBACK) &&
1920 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1921 !(cfg->fc_flags & RTF_LOCAL))) {
1922 /* hold loopback dev/idev if we haven't done so. */
1923 if (dev != net->loopback_dev) {
1924 if (dev) {
1925 dev_put(dev);
1926 in6_dev_put(idev);
1927 }
1928 dev = net->loopback_dev;
1929 dev_hold(dev);
1930 idev = in6_dev_get(dev);
1931 if (!idev) {
1932 err = -ENODEV;
1933 goto out;
1934 }
1935 }
1936 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1937 switch (cfg->fc_type) {
1938 case RTN_BLACKHOLE:
1939 rt->dst.error = -EINVAL;
1940 rt->dst.output = dst_discard_out;
1941 rt->dst.input = dst_discard;
1942 break;
1943 case RTN_PROHIBIT:
1944 rt->dst.error = -EACCES;
1945 rt->dst.output = ip6_pkt_prohibit_out;
1946 rt->dst.input = ip6_pkt_prohibit;
1947 break;
1948 case RTN_THROW:
1949 case RTN_UNREACHABLE:
1950 default:
1951 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1952 : (cfg->fc_type == RTN_UNREACHABLE)
1953 ? -EHOSTUNREACH : -ENETUNREACH;
1954 rt->dst.output = ip6_pkt_discard_out;
1955 rt->dst.input = ip6_pkt_discard;
1956 break;
1957 }
1958 goto install_route;
1959 }
1960
1961 if (cfg->fc_flags & RTF_GATEWAY) {
1962 const struct in6_addr *gw_addr;
1963 int gwa_type;
1964
1965 gw_addr = &cfg->fc_gateway;
1966 gwa_type = ipv6_addr_type(gw_addr);
1967
1968 /* if gw_addr is local we will fail to detect this in case
1969 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1970 * will return already-added prefix route via interface that
1971 * prefix route was assigned to, which might be non-loopback.
1972 */
1973 err = -EINVAL;
1974 if (ipv6_chk_addr_and_flags(net, gw_addr,
1975 gwa_type & IPV6_ADDR_LINKLOCAL ?
1976 dev : NULL, 0, 0))
1977 goto out;
1978
1979 rt->rt6i_gateway = *gw_addr;
1980
1981 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1982 struct rt6_info *grt = NULL;
1983
1984 /* IPv6 strictly inhibits using not link-local
1985 addresses as nexthop address.
1986 Otherwise, router will not able to send redirects.
1987 It is very good, but in some (rare!) circumstances
1988 (SIT, PtP, NBMA NOARP links) it is handy to allow
1989 some exceptions. --ANK
1990 */
1991 if (!(gwa_type & IPV6_ADDR_UNICAST))
1992 goto out;
1993
1994 if (cfg->fc_table)
1995 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1996
1997 if (!grt)
1998 grt = rt6_lookup(net, gw_addr, NULL,
1999 cfg->fc_ifindex, 1);
2000
2001 err = -EHOSTUNREACH;
2002 if (!grt)
2003 goto out;
2004 if (dev) {
2005 if (dev != grt->dst.dev) {
2006 ip6_rt_put(grt);
2007 goto out;
2008 }
2009 } else {
2010 dev = grt->dst.dev;
2011 idev = grt->rt6i_idev;
2012 dev_hold(dev);
2013 in6_dev_hold(grt->rt6i_idev);
2014 }
2015 if (!(grt->rt6i_flags & RTF_GATEWAY))
2016 err = 0;
2017 ip6_rt_put(grt);
2018
2019 if (err)
2020 goto out;
2021 }
2022 err = -EINVAL;
2023 if (!dev || (dev->flags & IFF_LOOPBACK))
2024 goto out;
2025 }
2026
2027 err = -ENODEV;
2028 if (!dev)
2029 goto out;
2030
2031 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2032 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2033 err = -EINVAL;
2034 goto out;
2035 }
2036 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2037 rt->rt6i_prefsrc.plen = 128;
2038 } else
2039 rt->rt6i_prefsrc.plen = 0;
2040
2041 rt->rt6i_flags = cfg->fc_flags;
2042
2043 install_route:
2044 rt->dst.dev = dev;
2045 rt->rt6i_idev = idev;
2046 rt->rt6i_table = table;
2047
2048 cfg->fc_nlinfo.nl_net = dev_net(dev);
2049
2050 return rt;
2051 out:
2052 if (dev)
2053 dev_put(dev);
2054 if (idev)
2055 in6_dev_put(idev);
2056 if (rt)
2057 dst_free(&rt->dst);
2058
2059 return ERR_PTR(err);
2060 }
2061
2062 int ip6_route_add(struct fib6_config *cfg)
2063 {
2064 struct mx6_config mxc = { .mx = NULL, };
2065 struct rt6_info *rt;
2066 int err;
2067
2068 rt = ip6_route_info_create(cfg);
2069 if (IS_ERR(rt)) {
2070 err = PTR_ERR(rt);
2071 rt = NULL;
2072 goto out;
2073 }
2074
2075 err = ip6_convert_metrics(&mxc, cfg);
2076 if (err)
2077 goto out;
2078
2079 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2080
2081 kfree(mxc.mx);
2082
2083 return err;
2084 out:
2085 if (rt)
2086 dst_free(&rt->dst);
2087
2088 return err;
2089 }
2090
2091 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2092 {
2093 int err;
2094 struct fib6_table *table;
2095 struct net *net = dev_net(rt->dst.dev);
2096
2097 if (rt == net->ipv6.ip6_null_entry ||
2098 rt->dst.flags & DST_NOCACHE) {
2099 err = -ENOENT;
2100 goto out;
2101 }
2102
2103 table = rt->rt6i_table;
2104 write_lock_bh(&table->tb6_lock);
2105 err = fib6_del(rt, info);
2106 write_unlock_bh(&table->tb6_lock);
2107
2108 out:
2109 ip6_rt_put(rt);
2110 return err;
2111 }
2112
2113 int ip6_del_rt(struct rt6_info *rt)
2114 {
2115 struct nl_info info = {
2116 .nl_net = dev_net(rt->dst.dev),
2117 };
2118 return __ip6_del_rt(rt, &info);
2119 }
2120
2121 static int ip6_route_del(struct fib6_config *cfg)
2122 {
2123 struct fib6_table *table;
2124 struct fib6_node *fn;
2125 struct rt6_info *rt;
2126 int err = -ESRCH;
2127
2128 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2129 if (!table)
2130 return err;
2131
2132 read_lock_bh(&table->tb6_lock);
2133
2134 fn = fib6_locate(&table->tb6_root,
2135 &cfg->fc_dst, cfg->fc_dst_len,
2136 &cfg->fc_src, cfg->fc_src_len);
2137
2138 if (fn) {
2139 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2140 if ((rt->rt6i_flags & RTF_CACHE) &&
2141 !(cfg->fc_flags & RTF_CACHE))
2142 continue;
2143 if (cfg->fc_ifindex &&
2144 (!rt->dst.dev ||
2145 rt->dst.dev->ifindex != cfg->fc_ifindex))
2146 continue;
2147 if (cfg->fc_flags & RTF_GATEWAY &&
2148 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2149 continue;
2150 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2151 continue;
2152 dst_hold(&rt->dst);
2153 read_unlock_bh(&table->tb6_lock);
2154
2155 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2156 }
2157 }
2158 read_unlock_bh(&table->tb6_lock);
2159
2160 return err;
2161 }
2162
2163 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2164 {
2165 struct netevent_redirect netevent;
2166 struct rt6_info *rt, *nrt = NULL;
2167 struct ndisc_options ndopts;
2168 struct inet6_dev *in6_dev;
2169 struct neighbour *neigh;
2170 struct rd_msg *msg;
2171 int optlen, on_link;
2172 u8 *lladdr;
2173
2174 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2175 optlen -= sizeof(*msg);
2176
2177 if (optlen < 0) {
2178 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2179 return;
2180 }
2181
2182 msg = (struct rd_msg *)icmp6_hdr(skb);
2183
2184 if (ipv6_addr_is_multicast(&msg->dest)) {
2185 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2186 return;
2187 }
2188
2189 on_link = 0;
2190 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2191 on_link = 1;
2192 } else if (ipv6_addr_type(&msg->target) !=
2193 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2194 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2195 return;
2196 }
2197
2198 in6_dev = __in6_dev_get(skb->dev);
2199 if (!in6_dev)
2200 return;
2201 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2202 return;
2203
2204 /* RFC2461 8.1:
2205 * The IP source address of the Redirect MUST be the same as the current
2206 * first-hop router for the specified ICMP Destination Address.
2207 */
2208
2209 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
2210 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2211 return;
2212 }
2213
2214 lladdr = NULL;
2215 if (ndopts.nd_opts_tgt_lladdr) {
2216 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2217 skb->dev);
2218 if (!lladdr) {
2219 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2220 return;
2221 }
2222 }
2223
2224 rt = (struct rt6_info *) dst;
2225 if (rt->rt6i_flags & RTF_REJECT) {
2226 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2227 return;
2228 }
2229
2230 /* Redirect received -> path was valid.
2231 * Look, redirects are sent only in response to data packets,
2232 * so that this nexthop apparently is reachable. --ANK
2233 */
2234 dst_confirm(&rt->dst);
2235
2236 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2237 if (!neigh)
2238 return;
2239
2240 /*
2241 * We have finally decided to accept it.
2242 */
2243
2244 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
2245 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2246 NEIGH_UPDATE_F_OVERRIDE|
2247 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2248 NEIGH_UPDATE_F_ISROUTER)),
2249 NDISC_REDIRECT, &ndopts);
2250
2251 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2252 if (!nrt)
2253 goto out;
2254
2255 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2256 if (on_link)
2257 nrt->rt6i_flags &= ~RTF_GATEWAY;
2258
2259 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2260
2261 if (ip6_ins_rt(nrt))
2262 goto out;
2263
2264 netevent.old = &rt->dst;
2265 netevent.new = &nrt->dst;
2266 netevent.daddr = &msg->dest;
2267 netevent.neigh = neigh;
2268 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2269
2270 if (rt->rt6i_flags & RTF_CACHE) {
2271 rt = (struct rt6_info *) dst_clone(&rt->dst);
2272 ip6_del_rt(rt);
2273 }
2274
2275 out:
2276 neigh_release(neigh);
2277 }
2278
2279 /*
2280 * Misc support functions
2281 */
2282
2283 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2284 {
2285 BUG_ON(from->dst.from);
2286
2287 rt->rt6i_flags &= ~RTF_EXPIRES;
2288 dst_hold(&from->dst);
2289 rt->dst.from = &from->dst;
2290 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2291 }
2292
2293 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2294 {
2295 rt->dst.input = ort->dst.input;
2296 rt->dst.output = ort->dst.output;
2297 rt->rt6i_dst = ort->rt6i_dst;
2298 rt->dst.error = ort->dst.error;
2299 rt->rt6i_idev = ort->rt6i_idev;
2300 if (rt->rt6i_idev)
2301 in6_dev_hold(rt->rt6i_idev);
2302 rt->dst.lastuse = jiffies;
2303 rt->rt6i_gateway = ort->rt6i_gateway;
2304 rt->rt6i_flags = ort->rt6i_flags;
2305 rt6_set_from(rt, ort);
2306 rt->rt6i_metric = ort->rt6i_metric;
2307 #ifdef CONFIG_IPV6_SUBTREES
2308 rt->rt6i_src = ort->rt6i_src;
2309 #endif
2310 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2311 rt->rt6i_table = ort->rt6i_table;
2312 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2313 }
2314
2315 #ifdef CONFIG_IPV6_ROUTE_INFO
2316 static struct rt6_info *rt6_get_route_info(struct net *net,
2317 const struct in6_addr *prefix, int prefixlen,
2318 const struct in6_addr *gwaddr, int ifindex)
2319 {
2320 struct fib6_node *fn;
2321 struct rt6_info *rt = NULL;
2322 struct fib6_table *table;
2323
2324 table = fib6_get_table(net, RT6_TABLE_INFO);
2325 if (!table)
2326 return NULL;
2327
2328 read_lock_bh(&table->tb6_lock);
2329 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2330 if (!fn)
2331 goto out;
2332
2333 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2334 if (rt->dst.dev->ifindex != ifindex)
2335 continue;
2336 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2337 continue;
2338 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2339 continue;
2340 dst_hold(&rt->dst);
2341 break;
2342 }
2343 out:
2344 read_unlock_bh(&table->tb6_lock);
2345 return rt;
2346 }
2347
2348 static struct rt6_info *rt6_add_route_info(struct net *net,
2349 const struct in6_addr *prefix, int prefixlen,
2350 const struct in6_addr *gwaddr, int ifindex,
2351 unsigned int pref)
2352 {
2353 struct fib6_config cfg = {
2354 .fc_metric = IP6_RT_PRIO_USER,
2355 .fc_ifindex = ifindex,
2356 .fc_dst_len = prefixlen,
2357 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2358 RTF_UP | RTF_PREF(pref),
2359 .fc_nlinfo.portid = 0,
2360 .fc_nlinfo.nlh = NULL,
2361 .fc_nlinfo.nl_net = net,
2362 };
2363
2364 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
2365 cfg.fc_dst = *prefix;
2366 cfg.fc_gateway = *gwaddr;
2367
2368 /* We should treat it as a default route if prefix length is 0. */
2369 if (!prefixlen)
2370 cfg.fc_flags |= RTF_DEFAULT;
2371
2372 ip6_route_add(&cfg);
2373
2374 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2375 }
2376 #endif
2377
2378 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2379 {
2380 struct rt6_info *rt;
2381 struct fib6_table *table;
2382
2383 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2384 if (!table)
2385 return NULL;
2386
2387 read_lock_bh(&table->tb6_lock);
2388 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2389 if (dev == rt->dst.dev &&
2390 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2391 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2392 break;
2393 }
2394 if (rt)
2395 dst_hold(&rt->dst);
2396 read_unlock_bh(&table->tb6_lock);
2397 return rt;
2398 }
2399
2400 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2401 struct net_device *dev,
2402 unsigned int pref)
2403 {
2404 struct fib6_config cfg = {
2405 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2406 .fc_metric = IP6_RT_PRIO_USER,
2407 .fc_ifindex = dev->ifindex,
2408 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2409 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2410 .fc_nlinfo.portid = 0,
2411 .fc_nlinfo.nlh = NULL,
2412 .fc_nlinfo.nl_net = dev_net(dev),
2413 };
2414
2415 cfg.fc_gateway = *gwaddr;
2416
2417 ip6_route_add(&cfg);
2418
2419 return rt6_get_dflt_router(gwaddr, dev);
2420 }
2421
2422 void rt6_purge_dflt_routers(struct net *net)
2423 {
2424 struct rt6_info *rt;
2425 struct fib6_table *table;
2426
2427 /* NOTE: Keep consistent with rt6_get_dflt_router */
2428 table = fib6_get_table(net, RT6_TABLE_DFLT);
2429 if (!table)
2430 return;
2431
2432 restart:
2433 read_lock_bh(&table->tb6_lock);
2434 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2435 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2436 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2437 dst_hold(&rt->dst);
2438 read_unlock_bh(&table->tb6_lock);
2439 ip6_del_rt(rt);
2440 goto restart;
2441 }
2442 }
2443 read_unlock_bh(&table->tb6_lock);
2444 }
2445
2446 static void rtmsg_to_fib6_config(struct net *net,
2447 struct in6_rtmsg *rtmsg,
2448 struct fib6_config *cfg)
2449 {
2450 memset(cfg, 0, sizeof(*cfg));
2451
2452 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2453 : RT6_TABLE_MAIN;
2454 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2455 cfg->fc_metric = rtmsg->rtmsg_metric;
2456 cfg->fc_expires = rtmsg->rtmsg_info;
2457 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2458 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2459 cfg->fc_flags = rtmsg->rtmsg_flags;
2460
2461 cfg->fc_nlinfo.nl_net = net;
2462
2463 cfg->fc_dst = rtmsg->rtmsg_dst;
2464 cfg->fc_src = rtmsg->rtmsg_src;
2465 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2466 }
2467
2468 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2469 {
2470 struct fib6_config cfg;
2471 struct in6_rtmsg rtmsg;
2472 int err;
2473
2474 switch (cmd) {
2475 case SIOCADDRT: /* Add a route */
2476 case SIOCDELRT: /* Delete a route */
2477 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2478 return -EPERM;
2479 err = copy_from_user(&rtmsg, arg,
2480 sizeof(struct in6_rtmsg));
2481 if (err)
2482 return -EFAULT;
2483
2484 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2485
2486 rtnl_lock();
2487 switch (cmd) {
2488 case SIOCADDRT:
2489 err = ip6_route_add(&cfg);
2490 break;
2491 case SIOCDELRT:
2492 err = ip6_route_del(&cfg);
2493 break;
2494 default:
2495 err = -EINVAL;
2496 }
2497 rtnl_unlock();
2498
2499 return err;
2500 }
2501
2502 return -EINVAL;
2503 }
2504
2505 /*
2506 * Drop the packet on the floor
2507 */
2508
2509 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2510 {
2511 int type;
2512 struct dst_entry *dst = skb_dst(skb);
2513 switch (ipstats_mib_noroutes) {
2514 case IPSTATS_MIB_INNOROUTES:
2515 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2516 if (type == IPV6_ADDR_ANY) {
2517 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2518 IPSTATS_MIB_INADDRERRORS);
2519 break;
2520 }
2521 /* FALLTHROUGH */
2522 case IPSTATS_MIB_OUTNOROUTES:
2523 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2524 ipstats_mib_noroutes);
2525 break;
2526 }
2527 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2528 kfree_skb(skb);
2529 return 0;
2530 }
2531
2532 static int ip6_pkt_discard(struct sk_buff *skb)
2533 {
2534 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2535 }
2536
2537 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2538 {
2539 skb->dev = skb_dst(skb)->dev;
2540 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2541 }
2542
2543 static int ip6_pkt_prohibit(struct sk_buff *skb)
2544 {
2545 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2546 }
2547
2548 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2549 {
2550 skb->dev = skb_dst(skb)->dev;
2551 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2552 }
2553
2554 /*
2555 * Allocate a dst for local (unicast / anycast) address.
2556 */
2557
2558 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2559 const struct in6_addr *addr,
2560 bool anycast)
2561 {
2562 u32 tb_id;
2563 struct net *net = dev_net(idev->dev);
2564 struct net_device *dev = net->loopback_dev;
2565 struct rt6_info *rt;
2566
2567 /* use L3 Master device as loopback for host routes if device
2568 * is enslaved and address is not link local or multicast
2569 */
2570 if (!rt6_need_strict(addr))
2571 dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
2572
2573 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
2574 if (!rt)
2575 return ERR_PTR(-ENOMEM);
2576
2577 in6_dev_hold(idev);
2578
2579 rt->dst.flags |= DST_HOST;
2580 rt->dst.input = ip6_input;
2581 rt->dst.output = ip6_output;
2582 rt->rt6i_idev = idev;
2583
2584 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2585 if (anycast)
2586 rt->rt6i_flags |= RTF_ANYCAST;
2587 else
2588 rt->rt6i_flags |= RTF_LOCAL;
2589
2590 rt->rt6i_gateway = *addr;
2591 rt->rt6i_dst.addr = *addr;
2592 rt->rt6i_dst.plen = 128;
2593 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2594 rt->rt6i_table = fib6_get_table(net, tb_id);
2595 rt->dst.flags |= DST_NOCACHE;
2596
2597 atomic_set(&rt->dst.__refcnt, 1);
2598
2599 return rt;
2600 }
2601
2602 /* remove deleted ip from prefsrc entries */
2603 struct arg_dev_net_ip {
2604 struct net_device *dev;
2605 struct net *net;
2606 struct in6_addr *addr;
2607 };
2608
2609 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2610 {
2611 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2612 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2613 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2614
2615 if (((void *)rt->dst.dev == dev || !dev) &&
2616 rt != net->ipv6.ip6_null_entry &&
2617 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2618 /* remove prefsrc entry */
2619 rt->rt6i_prefsrc.plen = 0;
2620 }
2621 return 0;
2622 }
2623
2624 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2625 {
2626 struct net *net = dev_net(ifp->idev->dev);
2627 struct arg_dev_net_ip adni = {
2628 .dev = ifp->idev->dev,
2629 .net = net,
2630 .addr = &ifp->addr,
2631 };
2632 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2633 }
2634
2635 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2636 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2637
2638 /* Remove routers and update dst entries when gateway turn into host. */
2639 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2640 {
2641 struct in6_addr *gateway = (struct in6_addr *)arg;
2642
2643 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2644 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2645 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2646 return -1;
2647 }
2648 return 0;
2649 }
2650
2651 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2652 {
2653 fib6_clean_all(net, fib6_clean_tohost, gateway);
2654 }
2655
2656 struct arg_dev_net {
2657 struct net_device *dev;
2658 struct net *net;
2659 };
2660
2661 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2662 {
2663 const struct arg_dev_net *adn = arg;
2664 const struct net_device *dev = adn->dev;
2665
2666 if ((rt->dst.dev == dev || !dev) &&
2667 rt != adn->net->ipv6.ip6_null_entry)
2668 return -1;
2669
2670 return 0;
2671 }
2672
2673 void rt6_ifdown(struct net *net, struct net_device *dev)
2674 {
2675 struct arg_dev_net adn = {
2676 .dev = dev,
2677 .net = net,
2678 };
2679
2680 fib6_clean_all(net, fib6_ifdown, &adn);
2681 icmp6_clean_all(fib6_ifdown, &adn);
2682 if (dev)
2683 rt6_uncached_list_flush_dev(net, dev);
2684 }
2685
2686 struct rt6_mtu_change_arg {
2687 struct net_device *dev;
2688 unsigned int mtu;
2689 };
2690
2691 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2692 {
2693 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2694 struct inet6_dev *idev;
2695
2696 /* In IPv6 pmtu discovery is not optional,
2697 so that RTAX_MTU lock cannot disable it.
2698 We still use this lock to block changes
2699 caused by addrconf/ndisc.
2700 */
2701
2702 idev = __in6_dev_get(arg->dev);
2703 if (!idev)
2704 return 0;
2705
2706 /* For administrative MTU increase, there is no way to discover
2707 IPv6 PMTU increase, so PMTU increase should be updated here.
2708 Since RFC 1981 doesn't include administrative MTU increase
2709 update PMTU increase is a MUST. (i.e. jumbo frame)
2710 */
2711 /*
2712 If new MTU is less than route PMTU, this new MTU will be the
2713 lowest MTU in the path, update the route PMTU to reflect PMTU
2714 decreases; if new MTU is greater than route PMTU, and the
2715 old MTU is the lowest MTU in the path, update the route PMTU
2716 to reflect the increase. In this case if the other nodes' MTU
2717 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2718 PMTU discouvery.
2719 */
2720 if (rt->dst.dev == arg->dev &&
2721 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2722 if (rt->rt6i_flags & RTF_CACHE) {
2723 /* For RTF_CACHE with rt6i_pmtu == 0
2724 * (i.e. a redirected route),
2725 * the metrics of its rt->dst.from has already
2726 * been updated.
2727 */
2728 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2729 rt->rt6i_pmtu = arg->mtu;
2730 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2731 (dst_mtu(&rt->dst) < arg->mtu &&
2732 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2733 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2734 }
2735 }
2736 return 0;
2737 }
2738
2739 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2740 {
2741 struct rt6_mtu_change_arg arg = {
2742 .dev = dev,
2743 .mtu = mtu,
2744 };
2745
2746 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2747 }
2748
2749 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2750 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2751 [RTA_OIF] = { .type = NLA_U32 },
2752 [RTA_IIF] = { .type = NLA_U32 },
2753 [RTA_PRIORITY] = { .type = NLA_U32 },
2754 [RTA_METRICS] = { .type = NLA_NESTED },
2755 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2756 [RTA_PREF] = { .type = NLA_U8 },
2757 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2758 [RTA_ENCAP] = { .type = NLA_NESTED },
2759 [RTA_EXPIRES] = { .type = NLA_U32 },
2760 };
2761
2762 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2763 struct fib6_config *cfg)
2764 {
2765 struct rtmsg *rtm;
2766 struct nlattr *tb[RTA_MAX+1];
2767 unsigned int pref;
2768 int err;
2769
2770 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2771 if (err < 0)
2772 goto errout;
2773
2774 err = -EINVAL;
2775 rtm = nlmsg_data(nlh);
2776 memset(cfg, 0, sizeof(*cfg));
2777
2778 cfg->fc_table = rtm->rtm_table;
2779 cfg->fc_dst_len = rtm->rtm_dst_len;
2780 cfg->fc_src_len = rtm->rtm_src_len;
2781 cfg->fc_flags = RTF_UP;
2782 cfg->fc_protocol = rtm->rtm_protocol;
2783 cfg->fc_type = rtm->rtm_type;
2784
2785 if (rtm->rtm_type == RTN_UNREACHABLE ||
2786 rtm->rtm_type == RTN_BLACKHOLE ||
2787 rtm->rtm_type == RTN_PROHIBIT ||
2788 rtm->rtm_type == RTN_THROW)
2789 cfg->fc_flags |= RTF_REJECT;
2790
2791 if (rtm->rtm_type == RTN_LOCAL)
2792 cfg->fc_flags |= RTF_LOCAL;
2793
2794 if (rtm->rtm_flags & RTM_F_CLONED)
2795 cfg->fc_flags |= RTF_CACHE;
2796
2797 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2798 cfg->fc_nlinfo.nlh = nlh;
2799 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2800
2801 if (tb[RTA_GATEWAY]) {
2802 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2803 cfg->fc_flags |= RTF_GATEWAY;
2804 }
2805
2806 if (tb[RTA_DST]) {
2807 int plen = (rtm->rtm_dst_len + 7) >> 3;
2808
2809 if (nla_len(tb[RTA_DST]) < plen)
2810 goto errout;
2811
2812 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2813 }
2814
2815 if (tb[RTA_SRC]) {
2816 int plen = (rtm->rtm_src_len + 7) >> 3;
2817
2818 if (nla_len(tb[RTA_SRC]) < plen)
2819 goto errout;
2820
2821 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2822 }
2823
2824 if (tb[RTA_PREFSRC])
2825 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2826
2827 if (tb[RTA_OIF])
2828 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2829
2830 if (tb[RTA_PRIORITY])
2831 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2832
2833 if (tb[RTA_METRICS]) {
2834 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2835 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2836 }
2837
2838 if (tb[RTA_TABLE])
2839 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2840
2841 if (tb[RTA_MULTIPATH]) {
2842 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2843 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2844 }
2845
2846 if (tb[RTA_PREF]) {
2847 pref = nla_get_u8(tb[RTA_PREF]);
2848 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2849 pref != ICMPV6_ROUTER_PREF_HIGH)
2850 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2851 cfg->fc_flags |= RTF_PREF(pref);
2852 }
2853
2854 if (tb[RTA_ENCAP])
2855 cfg->fc_encap = tb[RTA_ENCAP];
2856
2857 if (tb[RTA_ENCAP_TYPE])
2858 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2859
2860 if (tb[RTA_EXPIRES]) {
2861 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2862
2863 if (addrconf_finite_timeout(timeout)) {
2864 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2865 cfg->fc_flags |= RTF_EXPIRES;
2866 }
2867 }
2868
2869 err = 0;
2870 errout:
2871 return err;
2872 }
2873
2874 struct rt6_nh {
2875 struct rt6_info *rt6_info;
2876 struct fib6_config r_cfg;
2877 struct mx6_config mxc;
2878 struct list_head next;
2879 };
2880
2881 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2882 {
2883 struct rt6_nh *nh;
2884
2885 list_for_each_entry(nh, rt6_nh_list, next) {
2886 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2887 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2888 nh->r_cfg.fc_ifindex);
2889 }
2890 }
2891
2892 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2893 struct rt6_info *rt, struct fib6_config *r_cfg)
2894 {
2895 struct rt6_nh *nh;
2896 struct rt6_info *rtnh;
2897 int err = -EEXIST;
2898
2899 list_for_each_entry(nh, rt6_nh_list, next) {
2900 /* check if rt6_info already exists */
2901 rtnh = nh->rt6_info;
2902
2903 if (rtnh->dst.dev == rt->dst.dev &&
2904 rtnh->rt6i_idev == rt->rt6i_idev &&
2905 ipv6_addr_equal(&rtnh->rt6i_gateway,
2906 &rt->rt6i_gateway))
2907 return err;
2908 }
2909
2910 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2911 if (!nh)
2912 return -ENOMEM;
2913 nh->rt6_info = rt;
2914 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2915 if (err) {
2916 kfree(nh);
2917 return err;
2918 }
2919 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2920 list_add_tail(&nh->next, rt6_nh_list);
2921
2922 return 0;
2923 }
2924
2925 static int ip6_route_multipath_add(struct fib6_config *cfg)
2926 {
2927 struct fib6_config r_cfg;
2928 struct rtnexthop *rtnh;
2929 struct rt6_info *rt;
2930 struct rt6_nh *err_nh;
2931 struct rt6_nh *nh, *nh_safe;
2932 int remaining;
2933 int attrlen;
2934 int err = 1;
2935 int nhn = 0;
2936 int replace = (cfg->fc_nlinfo.nlh &&
2937 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2938 LIST_HEAD(rt6_nh_list);
2939
2940 remaining = cfg->fc_mp_len;
2941 rtnh = (struct rtnexthop *)cfg->fc_mp;
2942
2943 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2944 * rt6_info structs per nexthop
2945 */
2946 while (rtnh_ok(rtnh, remaining)) {
2947 memcpy(&r_cfg, cfg, sizeof(*cfg));
2948 if (rtnh->rtnh_ifindex)
2949 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2950
2951 attrlen = rtnh_attrlen(rtnh);
2952 if (attrlen > 0) {
2953 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2954
2955 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2956 if (nla) {
2957 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2958 r_cfg.fc_flags |= RTF_GATEWAY;
2959 }
2960 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2961 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2962 if (nla)
2963 r_cfg.fc_encap_type = nla_get_u16(nla);
2964 }
2965
2966 rt = ip6_route_info_create(&r_cfg);
2967 if (IS_ERR(rt)) {
2968 err = PTR_ERR(rt);
2969 rt = NULL;
2970 goto cleanup;
2971 }
2972
2973 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2974 if (err) {
2975 dst_free(&rt->dst);
2976 goto cleanup;
2977 }
2978
2979 rtnh = rtnh_next(rtnh, &remaining);
2980 }
2981
2982 err_nh = NULL;
2983 list_for_each_entry(nh, &rt6_nh_list, next) {
2984 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2985 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2986 nh->rt6_info = NULL;
2987 if (err) {
2988 if (replace && nhn)
2989 ip6_print_replace_route_err(&rt6_nh_list);
2990 err_nh = nh;
2991 goto add_errout;
2992 }
2993
2994 /* Because each route is added like a single route we remove
2995 * these flags after the first nexthop: if there is a collision,
2996 * we have already failed to add the first nexthop:
2997 * fib6_add_rt2node() has rejected it; when replacing, old
2998 * nexthops have been replaced by first new, the rest should
2999 * be added to it.
3000 */
3001 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3002 NLM_F_REPLACE);
3003 nhn++;
3004 }
3005
3006 goto cleanup;
3007
3008 add_errout:
3009 /* Delete routes that were already added */
3010 list_for_each_entry(nh, &rt6_nh_list, next) {
3011 if (err_nh == nh)
3012 break;
3013 ip6_route_del(&nh->r_cfg);
3014 }
3015
3016 cleanup:
3017 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3018 if (nh->rt6_info)
3019 dst_free(&nh->rt6_info->dst);
3020 kfree(nh->mxc.mx);
3021 list_del(&nh->next);
3022 kfree(nh);
3023 }
3024
3025 return err;
3026 }
3027
3028 static int ip6_route_multipath_del(struct fib6_config *cfg)
3029 {
3030 struct fib6_config r_cfg;
3031 struct rtnexthop *rtnh;
3032 int remaining;
3033 int attrlen;
3034 int err = 1, last_err = 0;
3035
3036 remaining = cfg->fc_mp_len;
3037 rtnh = (struct rtnexthop *)cfg->fc_mp;
3038
3039 /* Parse a Multipath Entry */
3040 while (rtnh_ok(rtnh, remaining)) {
3041 memcpy(&r_cfg, cfg, sizeof(*cfg));
3042 if (rtnh->rtnh_ifindex)
3043 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3044
3045 attrlen = rtnh_attrlen(rtnh);
3046 if (attrlen > 0) {
3047 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3048
3049 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3050 if (nla) {
3051 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3052 r_cfg.fc_flags |= RTF_GATEWAY;
3053 }
3054 }
3055 err = ip6_route_del(&r_cfg);
3056 if (err)
3057 last_err = err;
3058
3059 rtnh = rtnh_next(rtnh, &remaining);
3060 }
3061
3062 return last_err;
3063 }
3064
3065 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3066 {
3067 struct fib6_config cfg;
3068 int err;
3069
3070 err = rtm_to_fib6_config(skb, nlh, &cfg);
3071 if (err < 0)
3072 return err;
3073
3074 if (cfg.fc_mp)
3075 return ip6_route_multipath_del(&cfg);
3076 else
3077 return ip6_route_del(&cfg);
3078 }
3079
3080 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3081 {
3082 struct fib6_config cfg;
3083 int err;
3084
3085 err = rtm_to_fib6_config(skb, nlh, &cfg);
3086 if (err < 0)
3087 return err;
3088
3089 if (cfg.fc_mp)
3090 return ip6_route_multipath_add(&cfg);
3091 else
3092 return ip6_route_add(&cfg);
3093 }
3094
3095 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3096 {
3097 return NLMSG_ALIGN(sizeof(struct rtmsg))
3098 + nla_total_size(16) /* RTA_SRC */
3099 + nla_total_size(16) /* RTA_DST */
3100 + nla_total_size(16) /* RTA_GATEWAY */
3101 + nla_total_size(16) /* RTA_PREFSRC */
3102 + nla_total_size(4) /* RTA_TABLE */
3103 + nla_total_size(4) /* RTA_IIF */
3104 + nla_total_size(4) /* RTA_OIF */
3105 + nla_total_size(4) /* RTA_PRIORITY */
3106 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3107 + nla_total_size(sizeof(struct rta_cacheinfo))
3108 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3109 + nla_total_size(1) /* RTA_PREF */
3110 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3111 }
3112
3113 static int rt6_fill_node(struct net *net,
3114 struct sk_buff *skb, struct rt6_info *rt,
3115 struct in6_addr *dst, struct in6_addr *src,
3116 int iif, int type, u32 portid, u32 seq,
3117 int prefix, int nowait, unsigned int flags)
3118 {
3119 u32 metrics[RTAX_MAX];
3120 struct rtmsg *rtm;
3121 struct nlmsghdr *nlh;
3122 long expires;
3123 u32 table;
3124
3125 if (prefix) { /* user wants prefix routes only */
3126 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3127 /* success since this is not a prefix route */
3128 return 1;
3129 }
3130 }
3131
3132 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3133 if (!nlh)
3134 return -EMSGSIZE;
3135
3136 rtm = nlmsg_data(nlh);
3137 rtm->rtm_family = AF_INET6;
3138 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3139 rtm->rtm_src_len = rt->rt6i_src.plen;
3140 rtm->rtm_tos = 0;
3141 if (rt->rt6i_table)
3142 table = rt->rt6i_table->tb6_id;
3143 else
3144 table = RT6_TABLE_UNSPEC;
3145 rtm->rtm_table = table;
3146 if (nla_put_u32(skb, RTA_TABLE, table))
3147 goto nla_put_failure;
3148 if (rt->rt6i_flags & RTF_REJECT) {
3149 switch (rt->dst.error) {
3150 case -EINVAL:
3151 rtm->rtm_type = RTN_BLACKHOLE;
3152 break;
3153 case -EACCES:
3154 rtm->rtm_type = RTN_PROHIBIT;
3155 break;
3156 case -EAGAIN:
3157 rtm->rtm_type = RTN_THROW;
3158 break;
3159 default:
3160 rtm->rtm_type = RTN_UNREACHABLE;
3161 break;
3162 }
3163 }
3164 else if (rt->rt6i_flags & RTF_LOCAL)
3165 rtm->rtm_type = RTN_LOCAL;
3166 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3167 rtm->rtm_type = RTN_LOCAL;
3168 else
3169 rtm->rtm_type = RTN_UNICAST;
3170 rtm->rtm_flags = 0;
3171 if (!netif_carrier_ok(rt->dst.dev)) {
3172 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3173 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3174 rtm->rtm_flags |= RTNH_F_DEAD;
3175 }
3176 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3177 rtm->rtm_protocol = rt->rt6i_protocol;
3178 if (rt->rt6i_flags & RTF_DYNAMIC)
3179 rtm->rtm_protocol = RTPROT_REDIRECT;
3180 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3181 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3182 rtm->rtm_protocol = RTPROT_RA;
3183 else
3184 rtm->rtm_protocol = RTPROT_KERNEL;
3185 }
3186
3187 if (rt->rt6i_flags & RTF_CACHE)
3188 rtm->rtm_flags |= RTM_F_CLONED;
3189
3190 if (dst) {
3191 if (nla_put_in6_addr(skb, RTA_DST, dst))
3192 goto nla_put_failure;
3193 rtm->rtm_dst_len = 128;
3194 } else if (rtm->rtm_dst_len)
3195 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3196 goto nla_put_failure;
3197 #ifdef CONFIG_IPV6_SUBTREES
3198 if (src) {
3199 if (nla_put_in6_addr(skb, RTA_SRC, src))
3200 goto nla_put_failure;
3201 rtm->rtm_src_len = 128;
3202 } else if (rtm->rtm_src_len &&
3203 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3204 goto nla_put_failure;
3205 #endif
3206 if (iif) {
3207 #ifdef CONFIG_IPV6_MROUTE
3208 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3209 int err = ip6mr_get_route(net, skb, rtm, nowait);
3210 if (err <= 0) {
3211 if (!nowait) {
3212 if (err == 0)
3213 return 0;
3214 goto nla_put_failure;
3215 } else {
3216 if (err == -EMSGSIZE)
3217 goto nla_put_failure;
3218 }
3219 }
3220 } else
3221 #endif
3222 if (nla_put_u32(skb, RTA_IIF, iif))
3223 goto nla_put_failure;
3224 } else if (dst) {
3225 struct in6_addr saddr_buf;
3226 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3227 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3228 goto nla_put_failure;
3229 }
3230
3231 if (rt->rt6i_prefsrc.plen) {
3232 struct in6_addr saddr_buf;
3233 saddr_buf = rt->rt6i_prefsrc.addr;
3234 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3235 goto nla_put_failure;
3236 }
3237
3238 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3239 if (rt->rt6i_pmtu)
3240 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3241 if (rtnetlink_put_metrics(skb, metrics) < 0)
3242 goto nla_put_failure;
3243
3244 if (rt->rt6i_flags & RTF_GATEWAY) {
3245 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3246 goto nla_put_failure;
3247 }
3248
3249 if (rt->dst.dev &&
3250 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3251 goto nla_put_failure;
3252 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3253 goto nla_put_failure;
3254
3255 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3256
3257 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3258 goto nla_put_failure;
3259
3260 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3261 goto nla_put_failure;
3262
3263 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3264
3265 nlmsg_end(skb, nlh);
3266 return 0;
3267
3268 nla_put_failure:
3269 nlmsg_cancel(skb, nlh);
3270 return -EMSGSIZE;
3271 }
3272
3273 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3274 {
3275 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3276 int prefix;
3277
3278 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3279 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3280 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3281 } else
3282 prefix = 0;
3283
3284 return rt6_fill_node(arg->net,
3285 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3286 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3287 prefix, 0, NLM_F_MULTI);
3288 }
3289
3290 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3291 {
3292 struct net *net = sock_net(in_skb->sk);
3293 struct nlattr *tb[RTA_MAX+1];
3294 struct rt6_info *rt;
3295 struct sk_buff *skb;
3296 struct rtmsg *rtm;
3297 struct flowi6 fl6;
3298 int err, iif = 0, oif = 0;
3299
3300 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3301 if (err < 0)
3302 goto errout;
3303
3304 err = -EINVAL;
3305 memset(&fl6, 0, sizeof(fl6));
3306 rtm = nlmsg_data(nlh);
3307 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
3308
3309 if (tb[RTA_SRC]) {
3310 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3311 goto errout;
3312
3313 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3314 }
3315
3316 if (tb[RTA_DST]) {
3317 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3318 goto errout;
3319
3320 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3321 }
3322
3323 if (tb[RTA_IIF])
3324 iif = nla_get_u32(tb[RTA_IIF]);
3325
3326 if (tb[RTA_OIF])
3327 oif = nla_get_u32(tb[RTA_OIF]);
3328
3329 if (tb[RTA_MARK])
3330 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3331
3332 if (iif) {
3333 struct net_device *dev;
3334 int flags = 0;
3335
3336 dev = __dev_get_by_index(net, iif);
3337 if (!dev) {
3338 err = -ENODEV;
3339 goto errout;
3340 }
3341
3342 fl6.flowi6_iif = iif;
3343
3344 if (!ipv6_addr_any(&fl6.saddr))
3345 flags |= RT6_LOOKUP_F_HAS_SADDR;
3346
3347 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3348 flags);
3349 } else {
3350 fl6.flowi6_oif = oif;
3351
3352 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3353 }
3354
3355 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3356 if (!skb) {
3357 ip6_rt_put(rt);
3358 err = -ENOBUFS;
3359 goto errout;
3360 }
3361
3362 /* Reserve room for dummy headers, this skb can pass
3363 through good chunk of routing engine.
3364 */
3365 skb_reset_mac_header(skb);
3366 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3367
3368 skb_dst_set(skb, &rt->dst);
3369
3370 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3371 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3372 nlh->nlmsg_seq, 0, 0, 0);
3373 if (err < 0) {
3374 kfree_skb(skb);
3375 goto errout;
3376 }
3377
3378 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3379 errout:
3380 return err;
3381 }
3382
3383 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3384 unsigned int nlm_flags)
3385 {
3386 struct sk_buff *skb;
3387 struct net *net = info->nl_net;
3388 u32 seq;
3389 int err;
3390
3391 err = -ENOBUFS;
3392 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3393
3394 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3395 if (!skb)
3396 goto errout;
3397
3398 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3399 event, info->portid, seq, 0, 0, nlm_flags);
3400 if (err < 0) {
3401 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3402 WARN_ON(err == -EMSGSIZE);
3403 kfree_skb(skb);
3404 goto errout;
3405 }
3406 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3407 info->nlh, gfp_any());
3408 return;
3409 errout:
3410 if (err < 0)
3411 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3412 }
3413
3414 static int ip6_route_dev_notify(struct notifier_block *this,
3415 unsigned long event, void *ptr)
3416 {
3417 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3418 struct net *net = dev_net(dev);
3419
3420 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3421 net->ipv6.ip6_null_entry->dst.dev = dev;
3422 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3423 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3424 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3425 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3426 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3427 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3428 #endif
3429 }
3430
3431 return NOTIFY_OK;
3432 }
3433
3434 /*
3435 * /proc
3436 */
3437
3438 #ifdef CONFIG_PROC_FS
3439
3440 static const struct file_operations ipv6_route_proc_fops = {
3441 .owner = THIS_MODULE,
3442 .open = ipv6_route_open,
3443 .read = seq_read,
3444 .llseek = seq_lseek,
3445 .release = seq_release_net,
3446 };
3447
3448 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3449 {
3450 struct net *net = (struct net *)seq->private;
3451 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3452 net->ipv6.rt6_stats->fib_nodes,
3453 net->ipv6.rt6_stats->fib_route_nodes,
3454 net->ipv6.rt6_stats->fib_rt_alloc,
3455 net->ipv6.rt6_stats->fib_rt_entries,
3456 net->ipv6.rt6_stats->fib_rt_cache,
3457 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3458 net->ipv6.rt6_stats->fib_discarded_routes);
3459
3460 return 0;
3461 }
3462
3463 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3464 {
3465 return single_open_net(inode, file, rt6_stats_seq_show);
3466 }
3467
3468 static const struct file_operations rt6_stats_seq_fops = {
3469 .owner = THIS_MODULE,
3470 .open = rt6_stats_seq_open,
3471 .read = seq_read,
3472 .llseek = seq_lseek,
3473 .release = single_release_net,
3474 };
3475 #endif /* CONFIG_PROC_FS */
3476
3477 #ifdef CONFIG_SYSCTL
3478
3479 static
3480 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3481 void __user *buffer, size_t *lenp, loff_t *ppos)
3482 {
3483 struct net *net;
3484 int delay;
3485 if (!write)
3486 return -EINVAL;
3487
3488 net = (struct net *)ctl->extra1;
3489 delay = net->ipv6.sysctl.flush_delay;
3490 proc_dointvec(ctl, write, buffer, lenp, ppos);
3491 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3492 return 0;
3493 }
3494
3495 struct ctl_table ipv6_route_table_template[] = {
3496 {
3497 .procname = "flush",
3498 .data = &init_net.ipv6.sysctl.flush_delay,
3499 .maxlen = sizeof(int),
3500 .mode = 0200,
3501 .proc_handler = ipv6_sysctl_rtcache_flush
3502 },
3503 {
3504 .procname = "gc_thresh",
3505 .data = &ip6_dst_ops_template.gc_thresh,
3506 .maxlen = sizeof(int),
3507 .mode = 0644,
3508 .proc_handler = proc_dointvec,
3509 },
3510 {
3511 .procname = "max_size",
3512 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3513 .maxlen = sizeof(int),
3514 .mode = 0644,
3515 .proc_handler = proc_dointvec,
3516 },
3517 {
3518 .procname = "gc_min_interval",
3519 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3520 .maxlen = sizeof(int),
3521 .mode = 0644,
3522 .proc_handler = proc_dointvec_jiffies,
3523 },
3524 {
3525 .procname = "gc_timeout",
3526 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3527 .maxlen = sizeof(int),
3528 .mode = 0644,
3529 .proc_handler = proc_dointvec_jiffies,
3530 },
3531 {
3532 .procname = "gc_interval",
3533 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3534 .maxlen = sizeof(int),
3535 .mode = 0644,
3536 .proc_handler = proc_dointvec_jiffies,
3537 },
3538 {
3539 .procname = "gc_elasticity",
3540 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3541 .maxlen = sizeof(int),
3542 .mode = 0644,
3543 .proc_handler = proc_dointvec,
3544 },
3545 {
3546 .procname = "mtu_expires",
3547 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3548 .maxlen = sizeof(int),
3549 .mode = 0644,
3550 .proc_handler = proc_dointvec_jiffies,
3551 },
3552 {
3553 .procname = "min_adv_mss",
3554 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3555 .maxlen = sizeof(int),
3556 .mode = 0644,
3557 .proc_handler = proc_dointvec,
3558 },
3559 {
3560 .procname = "gc_min_interval_ms",
3561 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3562 .maxlen = sizeof(int),
3563 .mode = 0644,
3564 .proc_handler = proc_dointvec_ms_jiffies,
3565 },
3566 { }
3567 };
3568
3569 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3570 {
3571 struct ctl_table *table;
3572
3573 table = kmemdup(ipv6_route_table_template,
3574 sizeof(ipv6_route_table_template),
3575 GFP_KERNEL);
3576
3577 if (table) {
3578 table[0].data = &net->ipv6.sysctl.flush_delay;
3579 table[0].extra1 = net;
3580 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3581 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3582 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3583 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3584 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3585 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3586 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3587 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3588 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3589
3590 /* Don't export sysctls to unprivileged users */
3591 if (net->user_ns != &init_user_ns)
3592 table[0].procname = NULL;
3593 }
3594
3595 return table;
3596 }
3597 #endif
3598
3599 static int __net_init ip6_route_net_init(struct net *net)
3600 {
3601 int ret = -ENOMEM;
3602
3603 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3604 sizeof(net->ipv6.ip6_dst_ops));
3605
3606 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3607 goto out_ip6_dst_ops;
3608
3609 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3610 sizeof(*net->ipv6.ip6_null_entry),
3611 GFP_KERNEL);
3612 if (!net->ipv6.ip6_null_entry)
3613 goto out_ip6_dst_entries;
3614 net->ipv6.ip6_null_entry->dst.path =
3615 (struct dst_entry *)net->ipv6.ip6_null_entry;
3616 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3617 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3618 ip6_template_metrics, true);
3619
3620 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3621 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3622 sizeof(*net->ipv6.ip6_prohibit_entry),
3623 GFP_KERNEL);
3624 if (!net->ipv6.ip6_prohibit_entry)
3625 goto out_ip6_null_entry;
3626 net->ipv6.ip6_prohibit_entry->dst.path =
3627 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3628 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3629 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3630 ip6_template_metrics, true);
3631
3632 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3633 sizeof(*net->ipv6.ip6_blk_hole_entry),
3634 GFP_KERNEL);
3635 if (!net->ipv6.ip6_blk_hole_entry)
3636 goto out_ip6_prohibit_entry;
3637 net->ipv6.ip6_blk_hole_entry->dst.path =
3638 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3639 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3640 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3641 ip6_template_metrics, true);
3642 #endif
3643
3644 net->ipv6.sysctl.flush_delay = 0;
3645 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3646 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3647 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3648 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3649 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3650 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3651 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3652
3653 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3654
3655 ret = 0;
3656 out:
3657 return ret;
3658
3659 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3660 out_ip6_prohibit_entry:
3661 kfree(net->ipv6.ip6_prohibit_entry);
3662 out_ip6_null_entry:
3663 kfree(net->ipv6.ip6_null_entry);
3664 #endif
3665 out_ip6_dst_entries:
3666 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3667 out_ip6_dst_ops:
3668 goto out;
3669 }
3670
3671 static void __net_exit ip6_route_net_exit(struct net *net)
3672 {
3673 kfree(net->ipv6.ip6_null_entry);
3674 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3675 kfree(net->ipv6.ip6_prohibit_entry);
3676 kfree(net->ipv6.ip6_blk_hole_entry);
3677 #endif
3678 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3679 }
3680
3681 static int __net_init ip6_route_net_init_late(struct net *net)
3682 {
3683 #ifdef CONFIG_PROC_FS
3684 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3685 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3686 #endif
3687 return 0;
3688 }
3689
3690 static void __net_exit ip6_route_net_exit_late(struct net *net)
3691 {
3692 #ifdef CONFIG_PROC_FS
3693 remove_proc_entry("ipv6_route", net->proc_net);
3694 remove_proc_entry("rt6_stats", net->proc_net);
3695 #endif
3696 }
3697
3698 static struct pernet_operations ip6_route_net_ops = {
3699 .init = ip6_route_net_init,
3700 .exit = ip6_route_net_exit,
3701 };
3702
3703 static int __net_init ipv6_inetpeer_init(struct net *net)
3704 {
3705 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3706
3707 if (!bp)
3708 return -ENOMEM;
3709 inet_peer_base_init(bp);
3710 net->ipv6.peers = bp;
3711 return 0;
3712 }
3713
3714 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3715 {
3716 struct inet_peer_base *bp = net->ipv6.peers;
3717
3718 net->ipv6.peers = NULL;
3719 inetpeer_invalidate_tree(bp);
3720 kfree(bp);
3721 }
3722
3723 static struct pernet_operations ipv6_inetpeer_ops = {
3724 .init = ipv6_inetpeer_init,
3725 .exit = ipv6_inetpeer_exit,
3726 };
3727
3728 static struct pernet_operations ip6_route_net_late_ops = {
3729 .init = ip6_route_net_init_late,
3730 .exit = ip6_route_net_exit_late,
3731 };
3732
3733 static struct notifier_block ip6_route_dev_notifier = {
3734 .notifier_call = ip6_route_dev_notify,
3735 .priority = 0,
3736 };
3737
3738 int __init ip6_route_init(void)
3739 {
3740 int ret;
3741 int cpu;
3742
3743 ret = -ENOMEM;
3744 ip6_dst_ops_template.kmem_cachep =
3745 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3746 SLAB_HWCACHE_ALIGN, NULL);
3747 if (!ip6_dst_ops_template.kmem_cachep)
3748 goto out;
3749
3750 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3751 if (ret)
3752 goto out_kmem_cache;
3753
3754 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3755 if (ret)
3756 goto out_dst_entries;
3757
3758 ret = register_pernet_subsys(&ip6_route_net_ops);
3759 if (ret)
3760 goto out_register_inetpeer;
3761
3762 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3763
3764 /* Registering of the loopback is done before this portion of code,
3765 * the loopback reference in rt6_info will not be taken, do it
3766 * manually for init_net */
3767 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3768 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3769 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3770 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3771 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3772 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3773 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3774 #endif
3775 ret = fib6_init();
3776 if (ret)
3777 goto out_register_subsys;
3778
3779 ret = xfrm6_init();
3780 if (ret)
3781 goto out_fib6_init;
3782
3783 ret = fib6_rules_init();
3784 if (ret)
3785 goto xfrm6_init;
3786
3787 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3788 if (ret)
3789 goto fib6_rules_init;
3790
3791 ret = -ENOBUFS;
3792 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3793 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3794 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3795 goto out_register_late_subsys;
3796
3797 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3798 if (ret)
3799 goto out_register_late_subsys;
3800
3801 for_each_possible_cpu(cpu) {
3802 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3803
3804 INIT_LIST_HEAD(&ul->head);
3805 spin_lock_init(&ul->lock);
3806 }
3807
3808 out:
3809 return ret;
3810
3811 out_register_late_subsys:
3812 unregister_pernet_subsys(&ip6_route_net_late_ops);
3813 fib6_rules_init:
3814 fib6_rules_cleanup();
3815 xfrm6_init:
3816 xfrm6_fini();
3817 out_fib6_init:
3818 fib6_gc_cleanup();
3819 out_register_subsys:
3820 unregister_pernet_subsys(&ip6_route_net_ops);
3821 out_register_inetpeer:
3822 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3823 out_dst_entries:
3824 dst_entries_destroy(&ip6_dst_blackhole_ops);
3825 out_kmem_cache:
3826 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3827 goto out;
3828 }
3829
3830 void ip6_route_cleanup(void)
3831 {
3832 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3833 unregister_pernet_subsys(&ip6_route_net_late_ops);
3834 fib6_rules_cleanup();
3835 xfrm6_fini();
3836 fib6_gc_cleanup();
3837 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3838 unregister_pernet_subsys(&ip6_route_net_ops);
3839 dst_entries_destroy(&ip6_dst_blackhole_ops);
3840 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3841 }
Linux kernel - Deliverables
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