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Linux 4.8-rc8
[linux/fpc-iii.git] / net / ipv6 / route.c
blobe3a224b97905585287571ec2ce2c238580392793
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/dst_metadata.h>
58 #include <net/xfrm.h>
59 #include <net/netevent.h>
60 #include <net/netlink.h>
61 #include <net/nexthop.h>
62 #include <net/lwtunnel.h>
63 #include <net/ip_tunnels.h>
64 #include <net/l3mdev.h>
65 #include <trace/events/fib6.h>
66
67 #include <asm/uaccess.h>
68
69 #ifdef CONFIG_SYSCTL
70 #include <linux/sysctl.h>
71 #endif
72
73 enum rt6_nud_state {
74 RT6_NUD_FAIL_HARD = -3,
75 RT6_NUD_FAIL_PROBE = -2,
76 RT6_NUD_FAIL_DO_RR = -1,
77 RT6_NUD_SUCCEED = 1
78 };
79
80 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
81 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
82 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
83 static unsigned int ip6_mtu(const struct dst_entry *dst);
84 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
85 static void ip6_dst_destroy(struct dst_entry *);
86 static void ip6_dst_ifdown(struct dst_entry *,
87 struct net_device *dev, int how);
88 static int ip6_dst_gc(struct dst_ops *ops);
89
90 static int ip6_pkt_discard(struct sk_buff *skb);
91 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
92 static int ip6_pkt_prohibit(struct sk_buff *skb);
93 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
94 static void ip6_link_failure(struct sk_buff *skb);
95 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb, u32 mtu);
97 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb);
99 static void rt6_dst_from_metrics_check(struct rt6_info *rt);
100 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
101
102 #ifdef CONFIG_IPV6_ROUTE_INFO
103 static struct rt6_info *rt6_add_route_info(struct net *net,
104 const struct in6_addr *prefix, int prefixlen,
105 const struct in6_addr *gwaddr, int ifindex,
106 unsigned int pref);
107 static struct rt6_info *rt6_get_route_info(struct net *net,
108 const struct in6_addr *prefix, int prefixlen,
109 const struct in6_addr *gwaddr, int ifindex);
110 #endif
111
112 struct uncached_list {
113 spinlock_t lock;
114 struct list_head head;
115 };
116
117 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
118
119 static void rt6_uncached_list_add(struct rt6_info *rt)
120 {
121 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
122
123 rt->dst.flags |= DST_NOCACHE;
124 rt->rt6i_uncached_list = ul;
125
126 spin_lock_bh(&ul->lock);
127 list_add_tail(&rt->rt6i_uncached, &ul->head);
128 spin_unlock_bh(&ul->lock);
129 }
130
131 static void rt6_uncached_list_del(struct rt6_info *rt)
132 {
133 if (!list_empty(&rt->rt6i_uncached)) {
134 struct uncached_list *ul = rt->rt6i_uncached_list;
135
136 spin_lock_bh(&ul->lock);
137 list_del(&rt->rt6i_uncached);
138 spin_unlock_bh(&ul->lock);
139 }
140 }
141
142 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
143 {
144 struct net_device *loopback_dev = net->loopback_dev;
145 int cpu;
146
147 if (dev == loopback_dev)
148 return;
149
150 for_each_possible_cpu(cpu) {
151 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
152 struct rt6_info *rt;
153
154 spin_lock_bh(&ul->lock);
155 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
156 struct inet6_dev *rt_idev = rt->rt6i_idev;
157 struct net_device *rt_dev = rt->dst.dev;
158
159 if (rt_idev->dev == dev) {
160 rt->rt6i_idev = in6_dev_get(loopback_dev);
161 in6_dev_put(rt_idev);
162 }
163
164 if (rt_dev == dev) {
165 rt->dst.dev = loopback_dev;
166 dev_hold(rt->dst.dev);
167 dev_put(rt_dev);
168 }
169 }
170 spin_unlock_bh(&ul->lock);
171 }
172 }
173
174 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
175 {
176 return dst_metrics_write_ptr(rt->dst.from);
177 }
178
179 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
180 {
181 struct rt6_info *rt = (struct rt6_info *)dst;
182
183 if (rt->rt6i_flags & RTF_PCPU)
184 return rt6_pcpu_cow_metrics(rt);
185 else if (rt->rt6i_flags & RTF_CACHE)
186 return NULL;
187 else
188 return dst_cow_metrics_generic(dst, old);
189 }
190
191 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
192 struct sk_buff *skb,
193 const void *daddr)
194 {
195 struct in6_addr *p = &rt->rt6i_gateway;
196
197 if (!ipv6_addr_any(p))
198 return (const void *) p;
199 else if (skb)
200 return &ipv6_hdr(skb)->daddr;
201 return daddr;
202 }
203
204 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
205 struct sk_buff *skb,
206 const void *daddr)
207 {
208 struct rt6_info *rt = (struct rt6_info *) dst;
209 struct neighbour *n;
210
211 daddr = choose_neigh_daddr(rt, skb, daddr);
212 n = __ipv6_neigh_lookup(dst->dev, daddr);
213 if (n)
214 return n;
215 return neigh_create(&nd_tbl, daddr, dst->dev);
216 }
217
218 static struct dst_ops ip6_dst_ops_template = {
219 .family = AF_INET6,
220 .gc = ip6_dst_gc,
221 .gc_thresh = 1024,
222 .check = ip6_dst_check,
223 .default_advmss = ip6_default_advmss,
224 .mtu = ip6_mtu,
225 .cow_metrics = ipv6_cow_metrics,
226 .destroy = ip6_dst_destroy,
227 .ifdown = ip6_dst_ifdown,
228 .negative_advice = ip6_negative_advice,
229 .link_failure = ip6_link_failure,
230 .update_pmtu = ip6_rt_update_pmtu,
231 .redirect = rt6_do_redirect,
232 .local_out = __ip6_local_out,
233 .neigh_lookup = ip6_neigh_lookup,
234 };
235
236 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
237 {
238 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
239
240 return mtu ? : dst->dev->mtu;
241 }
242
243 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
244 struct sk_buff *skb, u32 mtu)
245 {
246 }
247
248 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
249 struct sk_buff *skb)
250 {
251 }
252
253 static struct dst_ops ip6_dst_blackhole_ops = {
254 .family = AF_INET6,
255 .destroy = ip6_dst_destroy,
256 .check = ip6_dst_check,
257 .mtu = ip6_blackhole_mtu,
258 .default_advmss = ip6_default_advmss,
259 .update_pmtu = ip6_rt_blackhole_update_pmtu,
260 .redirect = ip6_rt_blackhole_redirect,
261 .cow_metrics = dst_cow_metrics_generic,
262 .neigh_lookup = ip6_neigh_lookup,
263 };
264
265 static const u32 ip6_template_metrics[RTAX_MAX] = {
266 [RTAX_HOPLIMIT - 1] = 0,
267 };
268
269 static const struct rt6_info ip6_null_entry_template = {
270 .dst = {
271 .__refcnt = ATOMIC_INIT(1),
272 .__use = 1,
273 .obsolete = DST_OBSOLETE_FORCE_CHK,
274 .error = -ENETUNREACH,
275 .input = ip6_pkt_discard,
276 .output = ip6_pkt_discard_out,
277 },
278 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
279 .rt6i_protocol = RTPROT_KERNEL,
280 .rt6i_metric = ~(u32) 0,
281 .rt6i_ref = ATOMIC_INIT(1),
282 };
283
284 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
285
286 static const struct rt6_info ip6_prohibit_entry_template = {
287 .dst = {
288 .__refcnt = ATOMIC_INIT(1),
289 .__use = 1,
290 .obsolete = DST_OBSOLETE_FORCE_CHK,
291 .error = -EACCES,
292 .input = ip6_pkt_prohibit,
293 .output = ip6_pkt_prohibit_out,
294 },
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
296 .rt6i_protocol = RTPROT_KERNEL,
297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
299 };
300
301 static const struct rt6_info ip6_blk_hole_entry_template = {
302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
305 .obsolete = DST_OBSOLETE_FORCE_CHK,
306 .error = -EINVAL,
307 .input = dst_discard,
308 .output = dst_discard_out,
309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
311 .rt6i_protocol = RTPROT_KERNEL,
312 .rt6i_metric = ~(u32) 0,
313 .rt6i_ref = ATOMIC_INIT(1),
314 };
315
316 #endif
317
318 static void rt6_info_init(struct rt6_info *rt)
319 {
320 struct dst_entry *dst = &rt->dst;
321
322 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
323 INIT_LIST_HEAD(&rt->rt6i_siblings);
324 INIT_LIST_HEAD(&rt->rt6i_uncached);
325 }
326
327 /* allocate dst with ip6_dst_ops */
328 static struct rt6_info *__ip6_dst_alloc(struct net *net,
329 struct net_device *dev,
330 int flags)
331 {
332 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
333 0, DST_OBSOLETE_FORCE_CHK, flags);
334
335 if (rt)
336 rt6_info_init(rt);
337
338 return rt;
339 }
340
341 struct rt6_info *ip6_dst_alloc(struct net *net,
342 struct net_device *dev,
343 int flags)
344 {
345 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
346
347 if (rt) {
348 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
349 if (rt->rt6i_pcpu) {
350 int cpu;
351
352 for_each_possible_cpu(cpu) {
353 struct rt6_info **p;
354
355 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
356 /* no one shares rt */
357 *p = NULL;
358 }
359 } else {
360 dst_destroy((struct dst_entry *)rt);
361 return NULL;
362 }
363 }
364
365 return rt;
366 }
367 EXPORT_SYMBOL(ip6_dst_alloc);
368
369 static void ip6_dst_destroy(struct dst_entry *dst)
370 {
371 struct rt6_info *rt = (struct rt6_info *)dst;
372 struct dst_entry *from = dst->from;
373 struct inet6_dev *idev;
374
375 dst_destroy_metrics_generic(dst);
376 free_percpu(rt->rt6i_pcpu);
377 rt6_uncached_list_del(rt);
378
379 idev = rt->rt6i_idev;
380 if (idev) {
381 rt->rt6i_idev = NULL;
382 in6_dev_put(idev);
383 }
384
385 dst->from = NULL;
386 dst_release(from);
387 }
388
389 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
390 int how)
391 {
392 struct rt6_info *rt = (struct rt6_info *)dst;
393 struct inet6_dev *idev = rt->rt6i_idev;
394 struct net_device *loopback_dev =
395 dev_net(dev)->loopback_dev;
396
397 if (dev != loopback_dev) {
398 if (idev && idev->dev == dev) {
399 struct inet6_dev *loopback_idev =
400 in6_dev_get(loopback_dev);
401 if (loopback_idev) {
402 rt->rt6i_idev = loopback_idev;
403 in6_dev_put(idev);
404 }
405 }
406 }
407 }
408
409 static bool __rt6_check_expired(const struct rt6_info *rt)
410 {
411 if (rt->rt6i_flags & RTF_EXPIRES)
412 return time_after(jiffies, rt->dst.expires);
413 else
414 return false;
415 }
416
417 static bool rt6_check_expired(const struct rt6_info *rt)
418 {
419 if (rt->rt6i_flags & RTF_EXPIRES) {
420 if (time_after(jiffies, rt->dst.expires))
421 return true;
422 } else if (rt->dst.from) {
423 return rt6_check_expired((struct rt6_info *) rt->dst.from);
424 }
425 return false;
426 }
427
428 /* Multipath route selection:
429 * Hash based function using packet header and flowlabel.
430 * Adapted from fib_info_hashfn()
431 */
432 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
433 const struct flowi6 *fl6)
434 {
435 return get_hash_from_flowi6(fl6) % candidate_count;
436 }
437
438 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
439 struct flowi6 *fl6, int oif,
440 int strict)
441 {
442 struct rt6_info *sibling, *next_sibling;
443 int route_choosen;
444
445 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
446 /* Don't change the route, if route_choosen == 0
447 * (siblings does not include ourself)
448 */
449 if (route_choosen)
450 list_for_each_entry_safe(sibling, next_sibling,
451 &match->rt6i_siblings, rt6i_siblings) {
452 route_choosen--;
453 if (route_choosen == 0) {
454 if (rt6_score_route(sibling, oif, strict) < 0)
455 break;
456 match = sibling;
457 break;
458 }
459 }
460 return match;
461 }
462
463 /*
464 * Route lookup. Any table->tb6_lock is implied.
465 */
466
467 static inline struct rt6_info *rt6_device_match(struct net *net,
468 struct rt6_info *rt,
469 const struct in6_addr *saddr,
470 int oif,
471 int flags)
472 {
473 struct rt6_info *local = NULL;
474 struct rt6_info *sprt;
475
476 if (!oif && ipv6_addr_any(saddr))
477 goto out;
478
479 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
480 struct net_device *dev = sprt->dst.dev;
481
482 if (oif) {
483 if (dev->ifindex == oif)
484 return sprt;
485 if (dev->flags & IFF_LOOPBACK) {
486 if (!sprt->rt6i_idev ||
487 sprt->rt6i_idev->dev->ifindex != oif) {
488 if (flags & RT6_LOOKUP_F_IFACE)
489 continue;
490 if (local &&
491 local->rt6i_idev->dev->ifindex == oif)
492 continue;
493 }
494 local = sprt;
495 }
496 } else {
497 if (ipv6_chk_addr(net, saddr, dev,
498 flags & RT6_LOOKUP_F_IFACE))
499 return sprt;
500 }
501 }
502
503 if (oif) {
504 if (local)
505 return local;
506
507 if (flags & RT6_LOOKUP_F_IFACE)
508 return net->ipv6.ip6_null_entry;
509 }
510 out:
511 return rt;
512 }
513
514 #ifdef CONFIG_IPV6_ROUTER_PREF
515 struct __rt6_probe_work {
516 struct work_struct work;
517 struct in6_addr target;
518 struct net_device *dev;
519 };
520
521 static void rt6_probe_deferred(struct work_struct *w)
522 {
523 struct in6_addr mcaddr;
524 struct __rt6_probe_work *work =
525 container_of(w, struct __rt6_probe_work, work);
526
527 addrconf_addr_solict_mult(&work->target, &mcaddr);
528 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
529 dev_put(work->dev);
530 kfree(work);
531 }
532
533 static void rt6_probe(struct rt6_info *rt)
534 {
535 struct __rt6_probe_work *work;
536 struct neighbour *neigh;
537 /*
538 * Okay, this does not seem to be appropriate
539 * for now, however, we need to check if it
540 * is really so; aka Router Reachability Probing.
541 *
542 * Router Reachability Probe MUST be rate-limited
543 * to no more than one per minute.
544 */
545 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
546 return;
547 rcu_read_lock_bh();
548 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
549 if (neigh) {
550 if (neigh->nud_state & NUD_VALID)
551 goto out;
552
553 work = NULL;
554 write_lock(&neigh->lock);
555 if (!(neigh->nud_state & NUD_VALID) &&
556 time_after(jiffies,
557 neigh->updated +
558 rt->rt6i_idev->cnf.rtr_probe_interval)) {
559 work = kmalloc(sizeof(*work), GFP_ATOMIC);
560 if (work)
561 __neigh_set_probe_once(neigh);
562 }
563 write_unlock(&neigh->lock);
564 } else {
565 work = kmalloc(sizeof(*work), GFP_ATOMIC);
566 }
567
568 if (work) {
569 INIT_WORK(&work->work, rt6_probe_deferred);
570 work->target = rt->rt6i_gateway;
571 dev_hold(rt->dst.dev);
572 work->dev = rt->dst.dev;
573 schedule_work(&work->work);
574 }
575
576 out:
577 rcu_read_unlock_bh();
578 }
579 #else
580 static inline void rt6_probe(struct rt6_info *rt)
581 {
582 }
583 #endif
584
585 /*
586 * Default Router Selection (RFC 2461 6.3.6)
587 */
588 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
589 {
590 struct net_device *dev = rt->dst.dev;
591 if (!oif || dev->ifindex == oif)
592 return 2;
593 if ((dev->flags & IFF_LOOPBACK) &&
594 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
595 return 1;
596 return 0;
597 }
598
599 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
600 {
601 struct neighbour *neigh;
602 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
603
604 if (rt->rt6i_flags & RTF_NONEXTHOP ||
605 !(rt->rt6i_flags & RTF_GATEWAY))
606 return RT6_NUD_SUCCEED;
607
608 rcu_read_lock_bh();
609 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
610 if (neigh) {
611 read_lock(&neigh->lock);
612 if (neigh->nud_state & NUD_VALID)
613 ret = RT6_NUD_SUCCEED;
614 #ifdef CONFIG_IPV6_ROUTER_PREF
615 else if (!(neigh->nud_state & NUD_FAILED))
616 ret = RT6_NUD_SUCCEED;
617 else
618 ret = RT6_NUD_FAIL_PROBE;
619 #endif
620 read_unlock(&neigh->lock);
621 } else {
622 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
623 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
624 }
625 rcu_read_unlock_bh();
626
627 return ret;
628 }
629
630 static int rt6_score_route(struct rt6_info *rt, int oif,
631 int strict)
632 {
633 int m;
634
635 m = rt6_check_dev(rt, oif);
636 if (!m && (strict & RT6_LOOKUP_F_IFACE))
637 return RT6_NUD_FAIL_HARD;
638 #ifdef CONFIG_IPV6_ROUTER_PREF
639 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
640 #endif
641 if (strict & RT6_LOOKUP_F_REACHABLE) {
642 int n = rt6_check_neigh(rt);
643 if (n < 0)
644 return n;
645 }
646 return m;
647 }
648
649 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
650 int *mpri, struct rt6_info *match,
651 bool *do_rr)
652 {
653 int m;
654 bool match_do_rr = false;
655 struct inet6_dev *idev = rt->rt6i_idev;
656 struct net_device *dev = rt->dst.dev;
657
658 if (dev && !netif_carrier_ok(dev) &&
659 idev->cnf.ignore_routes_with_linkdown)
660 goto out;
661
662 if (rt6_check_expired(rt))
663 goto out;
664
665 m = rt6_score_route(rt, oif, strict);
666 if (m == RT6_NUD_FAIL_DO_RR) {
667 match_do_rr = true;
668 m = 0; /* lowest valid score */
669 } else if (m == RT6_NUD_FAIL_HARD) {
670 goto out;
671 }
672
673 if (strict & RT6_LOOKUP_F_REACHABLE)
674 rt6_probe(rt);
675
676 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
677 if (m > *mpri) {
678 *do_rr = match_do_rr;
679 *mpri = m;
680 match = rt;
681 }
682 out:
683 return match;
684 }
685
686 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
687 struct rt6_info *rr_head,
688 u32 metric, int oif, int strict,
689 bool *do_rr)
690 {
691 struct rt6_info *rt, *match, *cont;
692 int mpri = -1;
693
694 match = NULL;
695 cont = NULL;
696 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
697 if (rt->rt6i_metric != metric) {
698 cont = rt;
699 break;
700 }
701
702 match = find_match(rt, oif, strict, &mpri, match, do_rr);
703 }
704
705 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
706 if (rt->rt6i_metric != metric) {
707 cont = rt;
708 break;
709 }
710
711 match = find_match(rt, oif, strict, &mpri, match, do_rr);
712 }
713
714 if (match || !cont)
715 return match;
716
717 for (rt = cont; rt; rt = rt->dst.rt6_next)
718 match = find_match(rt, oif, strict, &mpri, match, do_rr);
719
720 return match;
721 }
722
723 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
724 {
725 struct rt6_info *match, *rt0;
726 struct net *net;
727 bool do_rr = false;
728
729 rt0 = fn->rr_ptr;
730 if (!rt0)
731 fn->rr_ptr = rt0 = fn->leaf;
732
733 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
734 &do_rr);
735
736 if (do_rr) {
737 struct rt6_info *next = rt0->dst.rt6_next;
738
739 /* no entries matched; do round-robin */
740 if (!next || next->rt6i_metric != rt0->rt6i_metric)
741 next = fn->leaf;
742
743 if (next != rt0)
744 fn->rr_ptr = next;
745 }
746
747 net = dev_net(rt0->dst.dev);
748 return match ? match : net->ipv6.ip6_null_entry;
749 }
750
751 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
752 {
753 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
754 }
755
756 #ifdef CONFIG_IPV6_ROUTE_INFO
757 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
758 const struct in6_addr *gwaddr)
759 {
760 struct net *net = dev_net(dev);
761 struct route_info *rinfo = (struct route_info *) opt;
762 struct in6_addr prefix_buf, *prefix;
763 unsigned int pref;
764 unsigned long lifetime;
765 struct rt6_info *rt;
766
767 if (len < sizeof(struct route_info)) {
768 return -EINVAL;
769 }
770
771 /* Sanity check for prefix_len and length */
772 if (rinfo->length > 3) {
773 return -EINVAL;
774 } else if (rinfo->prefix_len > 128) {
775 return -EINVAL;
776 } else if (rinfo->prefix_len > 64) {
777 if (rinfo->length < 2) {
778 return -EINVAL;
779 }
780 } else if (rinfo->prefix_len > 0) {
781 if (rinfo->length < 1) {
782 return -EINVAL;
783 }
784 }
785
786 pref = rinfo->route_pref;
787 if (pref == ICMPV6_ROUTER_PREF_INVALID)
788 return -EINVAL;
789
790 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
791
792 if (rinfo->length == 3)
793 prefix = (struct in6_addr *)rinfo->prefix;
794 else {
795 /* this function is safe */
796 ipv6_addr_prefix(&prefix_buf,
797 (struct in6_addr *)rinfo->prefix,
798 rinfo->prefix_len);
799 prefix = &prefix_buf;
800 }
801
802 if (rinfo->prefix_len == 0)
803 rt = rt6_get_dflt_router(gwaddr, dev);
804 else
805 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
806 gwaddr, dev->ifindex);
807
808 if (rt && !lifetime) {
809 ip6_del_rt(rt);
810 rt = NULL;
811 }
812
813 if (!rt && lifetime)
814 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
815 pref);
816 else if (rt)
817 rt->rt6i_flags = RTF_ROUTEINFO |
818 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
819
820 if (rt) {
821 if (!addrconf_finite_timeout(lifetime))
822 rt6_clean_expires(rt);
823 else
824 rt6_set_expires(rt, jiffies + HZ * lifetime);
825
826 ip6_rt_put(rt);
827 }
828 return 0;
829 }
830 #endif
831
832 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
833 struct in6_addr *saddr)
834 {
835 struct fib6_node *pn;
836 while (1) {
837 if (fn->fn_flags & RTN_TL_ROOT)
838 return NULL;
839 pn = fn->parent;
840 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
841 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
842 else
843 fn = pn;
844 if (fn->fn_flags & RTN_RTINFO)
845 return fn;
846 }
847 }
848
849 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
850 struct fib6_table *table,
851 struct flowi6 *fl6, int flags)
852 {
853 struct fib6_node *fn;
854 struct rt6_info *rt;
855
856 read_lock_bh(&table->tb6_lock);
857 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
858 restart:
859 rt = fn->leaf;
860 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
861 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
862 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
863 if (rt == net->ipv6.ip6_null_entry) {
864 fn = fib6_backtrack(fn, &fl6->saddr);
865 if (fn)
866 goto restart;
867 }
868 dst_use(&rt->dst, jiffies);
869 read_unlock_bh(&table->tb6_lock);
870
871 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
872
873 return rt;
874
875 }
876
877 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
878 int flags)
879 {
880 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
881 }
882 EXPORT_SYMBOL_GPL(ip6_route_lookup);
883
884 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
885 const struct in6_addr *saddr, int oif, int strict)
886 {
887 struct flowi6 fl6 = {
888 .flowi6_oif = oif,
889 .daddr = *daddr,
890 };
891 struct dst_entry *dst;
892 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
893
894 if (saddr) {
895 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
896 flags |= RT6_LOOKUP_F_HAS_SADDR;
897 }
898
899 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
900 if (dst->error == 0)
901 return (struct rt6_info *) dst;
902
903 dst_release(dst);
904
905 return NULL;
906 }
907 EXPORT_SYMBOL(rt6_lookup);
908
909 /* ip6_ins_rt is called with FREE table->tb6_lock.
910 It takes new route entry, the addition fails by any reason the
911 route is freed. In any case, if caller does not hold it, it may
912 be destroyed.
913 */
914
915 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
916 struct mx6_config *mxc)
917 {
918 int err;
919 struct fib6_table *table;
920
921 table = rt->rt6i_table;
922 write_lock_bh(&table->tb6_lock);
923 err = fib6_add(&table->tb6_root, rt, info, mxc);
924 write_unlock_bh(&table->tb6_lock);
925
926 return err;
927 }
928
929 int ip6_ins_rt(struct rt6_info *rt)
930 {
931 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
932 struct mx6_config mxc = { .mx = NULL, };
933
934 return __ip6_ins_rt(rt, &info, &mxc);
935 }
936
937 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
938 const struct in6_addr *daddr,
939 const struct in6_addr *saddr)
940 {
941 struct rt6_info *rt;
942
943 /*
944 * Clone the route.
945 */
946
947 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
948 ort = (struct rt6_info *)ort->dst.from;
949
950 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
951
952 if (!rt)
953 return NULL;
954
955 ip6_rt_copy_init(rt, ort);
956 rt->rt6i_flags |= RTF_CACHE;
957 rt->rt6i_metric = 0;
958 rt->dst.flags |= DST_HOST;
959 rt->rt6i_dst.addr = *daddr;
960 rt->rt6i_dst.plen = 128;
961
962 if (!rt6_is_gw_or_nonexthop(ort)) {
963 if (ort->rt6i_dst.plen != 128 &&
964 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
965 rt->rt6i_flags |= RTF_ANYCAST;
966 #ifdef CONFIG_IPV6_SUBTREES
967 if (rt->rt6i_src.plen && saddr) {
968 rt->rt6i_src.addr = *saddr;
969 rt->rt6i_src.plen = 128;
970 }
971 #endif
972 }
973
974 return rt;
975 }
976
977 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
978 {
979 struct rt6_info *pcpu_rt;
980
981 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
982 rt->dst.dev, rt->dst.flags);
983
984 if (!pcpu_rt)
985 return NULL;
986 ip6_rt_copy_init(pcpu_rt, rt);
987 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
988 pcpu_rt->rt6i_flags |= RTF_PCPU;
989 return pcpu_rt;
990 }
991
992 /* It should be called with read_lock_bh(&tb6_lock) acquired */
993 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
994 {
995 struct rt6_info *pcpu_rt, **p;
996
997 p = this_cpu_ptr(rt->rt6i_pcpu);
998 pcpu_rt = *p;
999
1000 if (pcpu_rt) {
1001 dst_hold(&pcpu_rt->dst);
1002 rt6_dst_from_metrics_check(pcpu_rt);
1003 }
1004 return pcpu_rt;
1005 }
1006
1007 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1008 {
1009 struct fib6_table *table = rt->rt6i_table;
1010 struct rt6_info *pcpu_rt, *prev, **p;
1011
1012 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1013 if (!pcpu_rt) {
1014 struct net *net = dev_net(rt->dst.dev);
1015
1016 dst_hold(&net->ipv6.ip6_null_entry->dst);
1017 return net->ipv6.ip6_null_entry;
1018 }
1019
1020 read_lock_bh(&table->tb6_lock);
1021 if (rt->rt6i_pcpu) {
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 prev = cmpxchg(p, NULL, pcpu_rt);
1024 if (prev) {
1025 /* If someone did it before us, return prev instead */
1026 dst_destroy(&pcpu_rt->dst);
1027 pcpu_rt = prev;
1028 }
1029 } else {
1030 /* rt has been removed from the fib6 tree
1031 * before we have a chance to acquire the read_lock.
1032 * In this case, don't brother to create a pcpu rt
1033 * since rt is going away anyway. The next
1034 * dst_check() will trigger a re-lookup.
1035 */
1036 dst_destroy(&pcpu_rt->dst);
1037 pcpu_rt = rt;
1038 }
1039 dst_hold(&pcpu_rt->dst);
1040 rt6_dst_from_metrics_check(pcpu_rt);
1041 read_unlock_bh(&table->tb6_lock);
1042 return pcpu_rt;
1043 }
1044
1045 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1046 int oif, struct flowi6 *fl6, int flags)
1047 {
1048 struct fib6_node *fn, *saved_fn;
1049 struct rt6_info *rt;
1050 int strict = 0;
1051
1052 strict |= flags & RT6_LOOKUP_F_IFACE;
1053 if (net->ipv6.devconf_all->forwarding == 0)
1054 strict |= RT6_LOOKUP_F_REACHABLE;
1055
1056 read_lock_bh(&table->tb6_lock);
1057
1058 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1059 saved_fn = fn;
1060
1061 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1062 oif = 0;
1063
1064 redo_rt6_select:
1065 rt = rt6_select(fn, oif, strict);
1066 if (rt->rt6i_nsiblings)
1067 rt = rt6_multipath_select(rt, fl6, oif, strict);
1068 if (rt == net->ipv6.ip6_null_entry) {
1069 fn = fib6_backtrack(fn, &fl6->saddr);
1070 if (fn)
1071 goto redo_rt6_select;
1072 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1073 /* also consider unreachable route */
1074 strict &= ~RT6_LOOKUP_F_REACHABLE;
1075 fn = saved_fn;
1076 goto redo_rt6_select;
1077 }
1078 }
1079
1080
1081 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1082 dst_use(&rt->dst, jiffies);
1083 read_unlock_bh(&table->tb6_lock);
1084
1085 rt6_dst_from_metrics_check(rt);
1086
1087 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1088 return rt;
1089 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1090 !(rt->rt6i_flags & RTF_GATEWAY))) {
1091 /* Create a RTF_CACHE clone which will not be
1092 * owned by the fib6 tree. It is for the special case where
1093 * the daddr in the skb during the neighbor look-up is different
1094 * from the fl6->daddr used to look-up route here.
1095 */
1096
1097 struct rt6_info *uncached_rt;
1098
1099 dst_use(&rt->dst, jiffies);
1100 read_unlock_bh(&table->tb6_lock);
1101
1102 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1103 dst_release(&rt->dst);
1104
1105 if (uncached_rt)
1106 rt6_uncached_list_add(uncached_rt);
1107 else
1108 uncached_rt = net->ipv6.ip6_null_entry;
1109
1110 dst_hold(&uncached_rt->dst);
1111
1112 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
1113 return uncached_rt;
1114
1115 } else {
1116 /* Get a percpu copy */
1117
1118 struct rt6_info *pcpu_rt;
1119
1120 rt->dst.lastuse = jiffies;
1121 rt->dst.__use++;
1122 pcpu_rt = rt6_get_pcpu_route(rt);
1123
1124 if (pcpu_rt) {
1125 read_unlock_bh(&table->tb6_lock);
1126 } else {
1127 /* We have to do the read_unlock first
1128 * because rt6_make_pcpu_route() may trigger
1129 * ip6_dst_gc() which will take the write_lock.
1130 */
1131 dst_hold(&rt->dst);
1132 read_unlock_bh(&table->tb6_lock);
1133 pcpu_rt = rt6_make_pcpu_route(rt);
1134 dst_release(&rt->dst);
1135 }
1136
1137 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
1138 return pcpu_rt;
1139
1140 }
1141 }
1142 EXPORT_SYMBOL_GPL(ip6_pol_route);
1143
1144 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1145 struct flowi6 *fl6, int flags)
1146 {
1147 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1148 }
1149
1150 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1151 struct net_device *dev,
1152 struct flowi6 *fl6, int flags)
1153 {
1154 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1155 flags |= RT6_LOOKUP_F_IFACE;
1156
1157 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1158 }
1159
1160 void ip6_route_input(struct sk_buff *skb)
1161 {
1162 const struct ipv6hdr *iph = ipv6_hdr(skb);
1163 struct net *net = dev_net(skb->dev);
1164 int flags = RT6_LOOKUP_F_HAS_SADDR;
1165 struct ip_tunnel_info *tun_info;
1166 struct flowi6 fl6 = {
1167 .flowi6_iif = l3mdev_fib_oif(skb->dev),
1168 .daddr = iph->daddr,
1169 .saddr = iph->saddr,
1170 .flowlabel = ip6_flowinfo(iph),
1171 .flowi6_mark = skb->mark,
1172 .flowi6_proto = iph->nexthdr,
1173 };
1174
1175 tun_info = skb_tunnel_info(skb);
1176 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1177 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1178 skb_dst_drop(skb);
1179 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1180 }
1181
1182 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1183 struct flowi6 *fl6, int flags)
1184 {
1185 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1186 }
1187
1188 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1189 struct flowi6 *fl6, int flags)
1190 {
1191 struct dst_entry *dst;
1192 bool any_src;
1193
1194 dst = l3mdev_get_rt6_dst(net, fl6);
1195 if (dst)
1196 return dst;
1197
1198 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1199
1200 any_src = ipv6_addr_any(&fl6->saddr);
1201 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1202 (fl6->flowi6_oif && any_src))
1203 flags |= RT6_LOOKUP_F_IFACE;
1204
1205 if (!any_src)
1206 flags |= RT6_LOOKUP_F_HAS_SADDR;
1207 else if (sk)
1208 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1209
1210 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1211 }
1212 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1213
1214 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1215 {
1216 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1217 struct dst_entry *new = NULL;
1218
1219 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1220 if (rt) {
1221 rt6_info_init(rt);
1222
1223 new = &rt->dst;
1224 new->__use = 1;
1225 new->input = dst_discard;
1226 new->output = dst_discard_out;
1227
1228 dst_copy_metrics(new, &ort->dst);
1229 rt->rt6i_idev = ort->rt6i_idev;
1230 if (rt->rt6i_idev)
1231 in6_dev_hold(rt->rt6i_idev);
1232
1233 rt->rt6i_gateway = ort->rt6i_gateway;
1234 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1235 rt->rt6i_metric = 0;
1236
1237 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1238 #ifdef CONFIG_IPV6_SUBTREES
1239 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1240 #endif
1241
1242 dst_free(new);
1243 }
1244
1245 dst_release(dst_orig);
1246 return new ? new : ERR_PTR(-ENOMEM);
1247 }
1248
1249 /*
1250 * Destination cache support functions
1251 */
1252
1253 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1254 {
1255 if (rt->dst.from &&
1256 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1257 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1258 }
1259
1260 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1261 {
1262 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1263 return NULL;
1264
1265 if (rt6_check_expired(rt))
1266 return NULL;
1267
1268 return &rt->dst;
1269 }
1270
1271 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1272 {
1273 if (!__rt6_check_expired(rt) &&
1274 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1275 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1276 return &rt->dst;
1277 else
1278 return NULL;
1279 }
1280
1281 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1282 {
1283 struct rt6_info *rt;
1284
1285 rt = (struct rt6_info *) dst;
1286
1287 /* All IPV6 dsts are created with ->obsolete set to the value
1288 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1289 * into this function always.
1290 */
1291
1292 rt6_dst_from_metrics_check(rt);
1293
1294 if (rt->rt6i_flags & RTF_PCPU ||
1295 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1296 return rt6_dst_from_check(rt, cookie);
1297 else
1298 return rt6_check(rt, cookie);
1299 }
1300
1301 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1302 {
1303 struct rt6_info *rt = (struct rt6_info *) dst;
1304
1305 if (rt) {
1306 if (rt->rt6i_flags & RTF_CACHE) {
1307 if (rt6_check_expired(rt)) {
1308 ip6_del_rt(rt);
1309 dst = NULL;
1310 }
1311 } else {
1312 dst_release(dst);
1313 dst = NULL;
1314 }
1315 }
1316 return dst;
1317 }
1318
1319 static void ip6_link_failure(struct sk_buff *skb)
1320 {
1321 struct rt6_info *rt;
1322
1323 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1324
1325 rt = (struct rt6_info *) skb_dst(skb);
1326 if (rt) {
1327 if (rt->rt6i_flags & RTF_CACHE) {
1328 dst_hold(&rt->dst);
1329 ip6_del_rt(rt);
1330 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1331 rt->rt6i_node->fn_sernum = -1;
1332 }
1333 }
1334 }
1335
1336 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1337 {
1338 struct net *net = dev_net(rt->dst.dev);
1339
1340 rt->rt6i_flags |= RTF_MODIFIED;
1341 rt->rt6i_pmtu = mtu;
1342 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1343 }
1344
1345 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1346 {
1347 return !(rt->rt6i_flags & RTF_CACHE) &&
1348 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1349 }
1350
1351 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1352 const struct ipv6hdr *iph, u32 mtu)
1353 {
1354 struct rt6_info *rt6 = (struct rt6_info *)dst;
1355
1356 if (rt6->rt6i_flags & RTF_LOCAL)
1357 return;
1358
1359 dst_confirm(dst);
1360 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1361 if (mtu >= dst_mtu(dst))
1362 return;
1363
1364 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1365 rt6_do_update_pmtu(rt6, mtu);
1366 } else {
1367 const struct in6_addr *daddr, *saddr;
1368 struct rt6_info *nrt6;
1369
1370 if (iph) {
1371 daddr = &iph->daddr;
1372 saddr = &iph->saddr;
1373 } else if (sk) {
1374 daddr = &sk->sk_v6_daddr;
1375 saddr = &inet6_sk(sk)->saddr;
1376 } else {
1377 return;
1378 }
1379 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1380 if (nrt6) {
1381 rt6_do_update_pmtu(nrt6, mtu);
1382
1383 /* ip6_ins_rt(nrt6) will bump the
1384 * rt6->rt6i_node->fn_sernum
1385 * which will fail the next rt6_check() and
1386 * invalidate the sk->sk_dst_cache.
1387 */
1388 ip6_ins_rt(nrt6);
1389 }
1390 }
1391 }
1392
1393 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1394 struct sk_buff *skb, u32 mtu)
1395 {
1396 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1397 }
1398
1399 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1400 int oif, u32 mark)
1401 {
1402 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1403 struct dst_entry *dst;
1404 struct flowi6 fl6;
1405
1406 memset(&fl6, 0, sizeof(fl6));
1407 fl6.flowi6_oif = oif;
1408 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1409 fl6.daddr = iph->daddr;
1410 fl6.saddr = iph->saddr;
1411 fl6.flowlabel = ip6_flowinfo(iph);
1412
1413 dst = ip6_route_output(net, NULL, &fl6);
1414 if (!dst->error)
1415 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1416 dst_release(dst);
1417 }
1418 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1419
1420 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1421 {
1422 struct dst_entry *dst;
1423
1424 ip6_update_pmtu(skb, sock_net(sk), mtu,
1425 sk->sk_bound_dev_if, sk->sk_mark);
1426
1427 dst = __sk_dst_get(sk);
1428 if (!dst || !dst->obsolete ||
1429 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1430 return;
1431
1432 bh_lock_sock(sk);
1433 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1434 ip6_datagram_dst_update(sk, false);
1435 bh_unlock_sock(sk);
1436 }
1437 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1438
1439 /* Handle redirects */
1440 struct ip6rd_flowi {
1441 struct flowi6 fl6;
1442 struct in6_addr gateway;
1443 };
1444
1445 static struct rt6_info *__ip6_route_redirect(struct net *net,
1446 struct fib6_table *table,
1447 struct flowi6 *fl6,
1448 int flags)
1449 {
1450 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1451 struct rt6_info *rt;
1452 struct fib6_node *fn;
1453
1454 /* Get the "current" route for this destination and
1455 * check if the redirect has come from approriate router.
1456 *
1457 * RFC 4861 specifies that redirects should only be
1458 * accepted if they come from the nexthop to the target.
1459 * Due to the way the routes are chosen, this notion
1460 * is a bit fuzzy and one might need to check all possible
1461 * routes.
1462 */
1463
1464 read_lock_bh(&table->tb6_lock);
1465 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1466 restart:
1467 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1468 if (rt6_check_expired(rt))
1469 continue;
1470 if (rt->dst.error)
1471 break;
1472 if (!(rt->rt6i_flags & RTF_GATEWAY))
1473 continue;
1474 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1475 continue;
1476 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1477 continue;
1478 break;
1479 }
1480
1481 if (!rt)
1482 rt = net->ipv6.ip6_null_entry;
1483 else if (rt->dst.error) {
1484 rt = net->ipv6.ip6_null_entry;
1485 goto out;
1486 }
1487
1488 if (rt == net->ipv6.ip6_null_entry) {
1489 fn = fib6_backtrack(fn, &fl6->saddr);
1490 if (fn)
1491 goto restart;
1492 }
1493
1494 out:
1495 dst_hold(&rt->dst);
1496
1497 read_unlock_bh(&table->tb6_lock);
1498
1499 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1500 return rt;
1501 };
1502
1503 static struct dst_entry *ip6_route_redirect(struct net *net,
1504 const struct flowi6 *fl6,
1505 const struct in6_addr *gateway)
1506 {
1507 int flags = RT6_LOOKUP_F_HAS_SADDR;
1508 struct ip6rd_flowi rdfl;
1509
1510 rdfl.fl6 = *fl6;
1511 rdfl.gateway = *gateway;
1512
1513 return fib6_rule_lookup(net, &rdfl.fl6,
1514 flags, __ip6_route_redirect);
1515 }
1516
1517 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1518 {
1519 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1520 struct dst_entry *dst;
1521 struct flowi6 fl6;
1522
1523 memset(&fl6, 0, sizeof(fl6));
1524 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1525 fl6.flowi6_oif = oif;
1526 fl6.flowi6_mark = mark;
1527 fl6.daddr = iph->daddr;
1528 fl6.saddr = iph->saddr;
1529 fl6.flowlabel = ip6_flowinfo(iph);
1530
1531 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1532 rt6_do_redirect(dst, NULL, skb);
1533 dst_release(dst);
1534 }
1535 EXPORT_SYMBOL_GPL(ip6_redirect);
1536
1537 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1538 u32 mark)
1539 {
1540 const struct ipv6hdr *iph = ipv6_hdr(skb);
1541 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1542 struct dst_entry *dst;
1543 struct flowi6 fl6;
1544
1545 memset(&fl6, 0, sizeof(fl6));
1546 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1547 fl6.flowi6_oif = oif;
1548 fl6.flowi6_mark = mark;
1549 fl6.daddr = msg->dest;
1550 fl6.saddr = iph->daddr;
1551
1552 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1553 rt6_do_redirect(dst, NULL, skb);
1554 dst_release(dst);
1555 }
1556
1557 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1558 {
1559 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1560 }
1561 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1562
1563 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1564 {
1565 struct net_device *dev = dst->dev;
1566 unsigned int mtu = dst_mtu(dst);
1567 struct net *net = dev_net(dev);
1568
1569 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1570
1571 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1572 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1573
1574 /*
1575 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1576 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1577 * IPV6_MAXPLEN is also valid and means: "any MSS,
1578 * rely only on pmtu discovery"
1579 */
1580 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1581 mtu = IPV6_MAXPLEN;
1582 return mtu;
1583 }
1584
1585 static unsigned int ip6_mtu(const struct dst_entry *dst)
1586 {
1587 const struct rt6_info *rt = (const struct rt6_info *)dst;
1588 unsigned int mtu = rt->rt6i_pmtu;
1589 struct inet6_dev *idev;
1590
1591 if (mtu)
1592 goto out;
1593
1594 mtu = dst_metric_raw(dst, RTAX_MTU);
1595 if (mtu)
1596 goto out;
1597
1598 mtu = IPV6_MIN_MTU;
1599
1600 rcu_read_lock();
1601 idev = __in6_dev_get(dst->dev);
1602 if (idev)
1603 mtu = idev->cnf.mtu6;
1604 rcu_read_unlock();
1605
1606 out:
1607 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1608 }
1609
1610 static struct dst_entry *icmp6_dst_gc_list;
1611 static DEFINE_SPINLOCK(icmp6_dst_lock);
1612
1613 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1614 struct flowi6 *fl6)
1615 {
1616 struct dst_entry *dst;
1617 struct rt6_info *rt;
1618 struct inet6_dev *idev = in6_dev_get(dev);
1619 struct net *net = dev_net(dev);
1620
1621 if (unlikely(!idev))
1622 return ERR_PTR(-ENODEV);
1623
1624 rt = ip6_dst_alloc(net, dev, 0);
1625 if (unlikely(!rt)) {
1626 in6_dev_put(idev);
1627 dst = ERR_PTR(-ENOMEM);
1628 goto out;
1629 }
1630
1631 rt->dst.flags |= DST_HOST;
1632 rt->dst.output = ip6_output;
1633 atomic_set(&rt->dst.__refcnt, 1);
1634 rt->rt6i_gateway = fl6->daddr;
1635 rt->rt6i_dst.addr = fl6->daddr;
1636 rt->rt6i_dst.plen = 128;
1637 rt->rt6i_idev = idev;
1638 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1639
1640 spin_lock_bh(&icmp6_dst_lock);
1641 rt->dst.next = icmp6_dst_gc_list;
1642 icmp6_dst_gc_list = &rt->dst;
1643 spin_unlock_bh(&icmp6_dst_lock);
1644
1645 fib6_force_start_gc(net);
1646
1647 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1648
1649 out:
1650 return dst;
1651 }
1652
1653 int icmp6_dst_gc(void)
1654 {
1655 struct dst_entry *dst, **pprev;
1656 int more = 0;
1657
1658 spin_lock_bh(&icmp6_dst_lock);
1659 pprev = &icmp6_dst_gc_list;
1660
1661 while ((dst = *pprev) != NULL) {
1662 if (!atomic_read(&dst->__refcnt)) {
1663 *pprev = dst->next;
1664 dst_free(dst);
1665 } else {
1666 pprev = &dst->next;
1667 ++more;
1668 }
1669 }
1670
1671 spin_unlock_bh(&icmp6_dst_lock);
1672
1673 return more;
1674 }
1675
1676 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1677 void *arg)
1678 {
1679 struct dst_entry *dst, **pprev;
1680
1681 spin_lock_bh(&icmp6_dst_lock);
1682 pprev = &icmp6_dst_gc_list;
1683 while ((dst = *pprev) != NULL) {
1684 struct rt6_info *rt = (struct rt6_info *) dst;
1685 if (func(rt, arg)) {
1686 *pprev = dst->next;
1687 dst_free(dst);
1688 } else {
1689 pprev = &dst->next;
1690 }
1691 }
1692 spin_unlock_bh(&icmp6_dst_lock);
1693 }
1694
1695 static int ip6_dst_gc(struct dst_ops *ops)
1696 {
1697 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1698 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1699 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1700 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1701 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1702 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1703 int entries;
1704
1705 entries = dst_entries_get_fast(ops);
1706 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1707 entries <= rt_max_size)
1708 goto out;
1709
1710 net->ipv6.ip6_rt_gc_expire++;
1711 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1712 entries = dst_entries_get_slow(ops);
1713 if (entries < ops->gc_thresh)
1714 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1715 out:
1716 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1717 return entries > rt_max_size;
1718 }
1719
1720 static int ip6_convert_metrics(struct mx6_config *mxc,
1721 const struct fib6_config *cfg)
1722 {
1723 bool ecn_ca = false;
1724 struct nlattr *nla;
1725 int remaining;
1726 u32 *mp;
1727
1728 if (!cfg->fc_mx)
1729 return 0;
1730
1731 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1732 if (unlikely(!mp))
1733 return -ENOMEM;
1734
1735 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1736 int type = nla_type(nla);
1737 u32 val;
1738
1739 if (!type)
1740 continue;
1741 if (unlikely(type > RTAX_MAX))
1742 goto err;
1743
1744 if (type == RTAX_CC_ALGO) {
1745 char tmp[TCP_CA_NAME_MAX];
1746
1747 nla_strlcpy(tmp, nla, sizeof(tmp));
1748 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1749 if (val == TCP_CA_UNSPEC)
1750 goto err;
1751 } else {
1752 val = nla_get_u32(nla);
1753 }
1754 if (type == RTAX_HOPLIMIT && val > 255)
1755 val = 255;
1756 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1757 goto err;
1758
1759 mp[type - 1] = val;
1760 __set_bit(type - 1, mxc->mx_valid);
1761 }
1762
1763 if (ecn_ca) {
1764 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1765 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1766 }
1767
1768 mxc->mx = mp;
1769 return 0;
1770 err:
1771 kfree(mp);
1772 return -EINVAL;
1773 }
1774
1775 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1776 struct fib6_config *cfg,
1777 const struct in6_addr *gw_addr)
1778 {
1779 struct flowi6 fl6 = {
1780 .flowi6_oif = cfg->fc_ifindex,
1781 .daddr = *gw_addr,
1782 .saddr = cfg->fc_prefsrc,
1783 };
1784 struct fib6_table *table;
1785 struct rt6_info *rt;
1786 int flags = RT6_LOOKUP_F_IFACE;
1787
1788 table = fib6_get_table(net, cfg->fc_table);
1789 if (!table)
1790 return NULL;
1791
1792 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1793 flags |= RT6_LOOKUP_F_HAS_SADDR;
1794
1795 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1796
1797 /* if table lookup failed, fall back to full lookup */
1798 if (rt == net->ipv6.ip6_null_entry) {
1799 ip6_rt_put(rt);
1800 rt = NULL;
1801 }
1802
1803 return rt;
1804 }
1805
1806 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1807 {
1808 struct net *net = cfg->fc_nlinfo.nl_net;
1809 struct rt6_info *rt = NULL;
1810 struct net_device *dev = NULL;
1811 struct inet6_dev *idev = NULL;
1812 struct fib6_table *table;
1813 int addr_type;
1814 int err = -EINVAL;
1815
1816 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1817 goto out;
1818 #ifndef CONFIG_IPV6_SUBTREES
1819 if (cfg->fc_src_len)
1820 goto out;
1821 #endif
1822 if (cfg->fc_ifindex) {
1823 err = -ENODEV;
1824 dev = dev_get_by_index(net, cfg->fc_ifindex);
1825 if (!dev)
1826 goto out;
1827 idev = in6_dev_get(dev);
1828 if (!idev)
1829 goto out;
1830 }
1831
1832 if (cfg->fc_metric == 0)
1833 cfg->fc_metric = IP6_RT_PRIO_USER;
1834
1835 err = -ENOBUFS;
1836 if (cfg->fc_nlinfo.nlh &&
1837 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1838 table = fib6_get_table(net, cfg->fc_table);
1839 if (!table) {
1840 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1841 table = fib6_new_table(net, cfg->fc_table);
1842 }
1843 } else {
1844 table = fib6_new_table(net, cfg->fc_table);
1845 }
1846
1847 if (!table)
1848 goto out;
1849
1850 rt = ip6_dst_alloc(net, NULL,
1851 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1852
1853 if (!rt) {
1854 err = -ENOMEM;
1855 goto out;
1856 }
1857
1858 if (cfg->fc_flags & RTF_EXPIRES)
1859 rt6_set_expires(rt, jiffies +
1860 clock_t_to_jiffies(cfg->fc_expires));
1861 else
1862 rt6_clean_expires(rt);
1863
1864 if (cfg->fc_protocol == RTPROT_UNSPEC)
1865 cfg->fc_protocol = RTPROT_BOOT;
1866 rt->rt6i_protocol = cfg->fc_protocol;
1867
1868 addr_type = ipv6_addr_type(&cfg->fc_dst);
1869
1870 if (addr_type & IPV6_ADDR_MULTICAST)
1871 rt->dst.input = ip6_mc_input;
1872 else if (cfg->fc_flags & RTF_LOCAL)
1873 rt->dst.input = ip6_input;
1874 else
1875 rt->dst.input = ip6_forward;
1876
1877 rt->dst.output = ip6_output;
1878
1879 if (cfg->fc_encap) {
1880 struct lwtunnel_state *lwtstate;
1881
1882 err = lwtunnel_build_state(dev, cfg->fc_encap_type,
1883 cfg->fc_encap, AF_INET6, cfg,
1884 &lwtstate);
1885 if (err)
1886 goto out;
1887 rt->dst.lwtstate = lwtstate_get(lwtstate);
1888 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1889 rt->dst.lwtstate->orig_output = rt->dst.output;
1890 rt->dst.output = lwtunnel_output;
1891 }
1892 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1893 rt->dst.lwtstate->orig_input = rt->dst.input;
1894 rt->dst.input = lwtunnel_input;
1895 }
1896 }
1897
1898 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1899 rt->rt6i_dst.plen = cfg->fc_dst_len;
1900 if (rt->rt6i_dst.plen == 128)
1901 rt->dst.flags |= DST_HOST;
1902
1903 #ifdef CONFIG_IPV6_SUBTREES
1904 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1905 rt->rt6i_src.plen = cfg->fc_src_len;
1906 #endif
1907
1908 rt->rt6i_metric = cfg->fc_metric;
1909
1910 /* We cannot add true routes via loopback here,
1911 they would result in kernel looping; promote them to reject routes
1912 */
1913 if ((cfg->fc_flags & RTF_REJECT) ||
1914 (dev && (dev->flags & IFF_LOOPBACK) &&
1915 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1916 !(cfg->fc_flags & RTF_LOCAL))) {
1917 /* hold loopback dev/idev if we haven't done so. */
1918 if (dev != net->loopback_dev) {
1919 if (dev) {
1920 dev_put(dev);
1921 in6_dev_put(idev);
1922 }
1923 dev = net->loopback_dev;
1924 dev_hold(dev);
1925 idev = in6_dev_get(dev);
1926 if (!idev) {
1927 err = -ENODEV;
1928 goto out;
1929 }
1930 }
1931 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1932 switch (cfg->fc_type) {
1933 case RTN_BLACKHOLE:
1934 rt->dst.error = -EINVAL;
1935 rt->dst.output = dst_discard_out;
1936 rt->dst.input = dst_discard;
1937 break;
1938 case RTN_PROHIBIT:
1939 rt->dst.error = -EACCES;
1940 rt->dst.output = ip6_pkt_prohibit_out;
1941 rt->dst.input = ip6_pkt_prohibit;
1942 break;
1943 case RTN_THROW:
1944 case RTN_UNREACHABLE:
1945 default:
1946 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1947 : (cfg->fc_type == RTN_UNREACHABLE)
1948 ? -EHOSTUNREACH : -ENETUNREACH;
1949 rt->dst.output = ip6_pkt_discard_out;
1950 rt->dst.input = ip6_pkt_discard;
1951 break;
1952 }
1953 goto install_route;
1954 }
1955
1956 if (cfg->fc_flags & RTF_GATEWAY) {
1957 const struct in6_addr *gw_addr;
1958 int gwa_type;
1959
1960 gw_addr = &cfg->fc_gateway;
1961 gwa_type = ipv6_addr_type(gw_addr);
1962
1963 /* if gw_addr is local we will fail to detect this in case
1964 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1965 * will return already-added prefix route via interface that
1966 * prefix route was assigned to, which might be non-loopback.
1967 */
1968 err = -EINVAL;
1969 if (ipv6_chk_addr_and_flags(net, gw_addr,
1970 gwa_type & IPV6_ADDR_LINKLOCAL ?
1971 dev : NULL, 0, 0))
1972 goto out;
1973
1974 rt->rt6i_gateway = *gw_addr;
1975
1976 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1977 struct rt6_info *grt = NULL;
1978
1979 /* IPv6 strictly inhibits using not link-local
1980 addresses as nexthop address.
1981 Otherwise, router will not able to send redirects.
1982 It is very good, but in some (rare!) circumstances
1983 (SIT, PtP, NBMA NOARP links) it is handy to allow
1984 some exceptions. --ANK
1985 */
1986 if (!(gwa_type & IPV6_ADDR_UNICAST))
1987 goto out;
1988
1989 if (cfg->fc_table) {
1990 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
1991
1992 if (grt) {
1993 if (grt->rt6i_flags & RTF_GATEWAY ||
1994 (dev && dev != grt->dst.dev)) {
1995 ip6_rt_put(grt);
1996 grt = NULL;
1997 }
1998 }
1999 }
2000
2001 if (!grt)
2002 grt = rt6_lookup(net, gw_addr, NULL,
2003 cfg->fc_ifindex, 1);
2004
2005 err = -EHOSTUNREACH;
2006 if (!grt)
2007 goto out;
2008 if (dev) {
2009 if (dev != grt->dst.dev) {
2010 ip6_rt_put(grt);
2011 goto out;
2012 }
2013 } else {
2014 dev = grt->dst.dev;
2015 idev = grt->rt6i_idev;
2016 dev_hold(dev);
2017 in6_dev_hold(grt->rt6i_idev);
2018 }
2019 if (!(grt->rt6i_flags & RTF_GATEWAY))
2020 err = 0;
2021 ip6_rt_put(grt);
2022
2023 if (err)
2024 goto out;
2025 }
2026 err = -EINVAL;
2027 if (!dev || (dev->flags & IFF_LOOPBACK))
2028 goto out;
2029 }
2030
2031 err = -ENODEV;
2032 if (!dev)
2033 goto out;
2034
2035 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2036 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2037 err = -EINVAL;
2038 goto out;
2039 }
2040 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2041 rt->rt6i_prefsrc.plen = 128;
2042 } else
2043 rt->rt6i_prefsrc.plen = 0;
2044
2045 rt->rt6i_flags = cfg->fc_flags;
2046
2047 install_route:
2048 rt->dst.dev = dev;
2049 rt->rt6i_idev = idev;
2050 rt->rt6i_table = table;
2051
2052 cfg->fc_nlinfo.nl_net = dev_net(dev);
2053
2054 return rt;
2055 out:
2056 if (dev)
2057 dev_put(dev);
2058 if (idev)
2059 in6_dev_put(idev);
2060 if (rt)
2061 dst_free(&rt->dst);
2062
2063 return ERR_PTR(err);
2064 }
2065
2066 int ip6_route_add(struct fib6_config *cfg)
2067 {
2068 struct mx6_config mxc = { .mx = NULL, };
2069 struct rt6_info *rt;
2070 int err;
2071
2072 rt = ip6_route_info_create(cfg);
2073 if (IS_ERR(rt)) {
2074 err = PTR_ERR(rt);
2075 rt = NULL;
2076 goto out;
2077 }
2078
2079 err = ip6_convert_metrics(&mxc, cfg);
2080 if (err)
2081 goto out;
2082
2083 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2084
2085 kfree(mxc.mx);
2086
2087 return err;
2088 out:
2089 if (rt)
2090 dst_free(&rt->dst);
2091
2092 return err;
2093 }
2094
2095 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2096 {
2097 int err;
2098 struct fib6_table *table;
2099 struct net *net = dev_net(rt->dst.dev);
2100
2101 if (rt == net->ipv6.ip6_null_entry ||
2102 rt->dst.flags & DST_NOCACHE) {
2103 err = -ENOENT;
2104 goto out;
2105 }
2106
2107 table = rt->rt6i_table;
2108 write_lock_bh(&table->tb6_lock);
2109 err = fib6_del(rt, info);
2110 write_unlock_bh(&table->tb6_lock);
2111
2112 out:
2113 ip6_rt_put(rt);
2114 return err;
2115 }
2116
2117 int ip6_del_rt(struct rt6_info *rt)
2118 {
2119 struct nl_info info = {
2120 .nl_net = dev_net(rt->dst.dev),
2121 };
2122 return __ip6_del_rt(rt, &info);
2123 }
2124
2125 static int ip6_route_del(struct fib6_config *cfg)
2126 {
2127 struct fib6_table *table;
2128 struct fib6_node *fn;
2129 struct rt6_info *rt;
2130 int err = -ESRCH;
2131
2132 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2133 if (!table)
2134 return err;
2135
2136 read_lock_bh(&table->tb6_lock);
2137
2138 fn = fib6_locate(&table->tb6_root,
2139 &cfg->fc_dst, cfg->fc_dst_len,
2140 &cfg->fc_src, cfg->fc_src_len);
2141
2142 if (fn) {
2143 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2144 if ((rt->rt6i_flags & RTF_CACHE) &&
2145 !(cfg->fc_flags & RTF_CACHE))
2146 continue;
2147 if (cfg->fc_ifindex &&
2148 (!rt->dst.dev ||
2149 rt->dst.dev->ifindex != cfg->fc_ifindex))
2150 continue;
2151 if (cfg->fc_flags & RTF_GATEWAY &&
2152 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2153 continue;
2154 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2155 continue;
2156 dst_hold(&rt->dst);
2157 read_unlock_bh(&table->tb6_lock);
2158
2159 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2160 }
2161 }
2162 read_unlock_bh(&table->tb6_lock);
2163
2164 return err;
2165 }
2166
2167 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2168 {
2169 struct netevent_redirect netevent;
2170 struct rt6_info *rt, *nrt = NULL;
2171 struct ndisc_options ndopts;
2172 struct inet6_dev *in6_dev;
2173 struct neighbour *neigh;
2174 struct rd_msg *msg;
2175 int optlen, on_link;
2176 u8 *lladdr;
2177
2178 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2179 optlen -= sizeof(*msg);
2180
2181 if (optlen < 0) {
2182 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2183 return;
2184 }
2185
2186 msg = (struct rd_msg *)icmp6_hdr(skb);
2187
2188 if (ipv6_addr_is_multicast(&msg->dest)) {
2189 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2190 return;
2191 }
2192
2193 on_link = 0;
2194 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2195 on_link = 1;
2196 } else if (ipv6_addr_type(&msg->target) !=
2197 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2198 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2199 return;
2200 }
2201
2202 in6_dev = __in6_dev_get(skb->dev);
2203 if (!in6_dev)
2204 return;
2205 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2206 return;
2207
2208 /* RFC2461 8.1:
2209 * The IP source address of the Redirect MUST be the same as the current
2210 * first-hop router for the specified ICMP Destination Address.
2211 */
2212
2213 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
2214 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2215 return;
2216 }
2217
2218 lladdr = NULL;
2219 if (ndopts.nd_opts_tgt_lladdr) {
2220 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2221 skb->dev);
2222 if (!lladdr) {
2223 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2224 return;
2225 }
2226 }
2227
2228 rt = (struct rt6_info *) dst;
2229 if (rt->rt6i_flags & RTF_REJECT) {
2230 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2231 return;
2232 }
2233
2234 /* Redirect received -> path was valid.
2235 * Look, redirects are sent only in response to data packets,
2236 * so that this nexthop apparently is reachable. --ANK
2237 */
2238 dst_confirm(&rt->dst);
2239
2240 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2241 if (!neigh)
2242 return;
2243
2244 /*
2245 * We have finally decided to accept it.
2246 */
2247
2248 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
2249 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2250 NEIGH_UPDATE_F_OVERRIDE|
2251 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2252 NEIGH_UPDATE_F_ISROUTER)),
2253 NDISC_REDIRECT, &ndopts);
2254
2255 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2256 if (!nrt)
2257 goto out;
2258
2259 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2260 if (on_link)
2261 nrt->rt6i_flags &= ~RTF_GATEWAY;
2262
2263 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2264
2265 if (ip6_ins_rt(nrt))
2266 goto out;
2267
2268 netevent.old = &rt->dst;
2269 netevent.new = &nrt->dst;
2270 netevent.daddr = &msg->dest;
2271 netevent.neigh = neigh;
2272 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2273
2274 if (rt->rt6i_flags & RTF_CACHE) {
2275 rt = (struct rt6_info *) dst_clone(&rt->dst);
2276 ip6_del_rt(rt);
2277 }
2278
2279 out:
2280 neigh_release(neigh);
2281 }
2282
2283 /*
2284 * Misc support functions
2285 */
2286
2287 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2288 {
2289 BUG_ON(from->dst.from);
2290
2291 rt->rt6i_flags &= ~RTF_EXPIRES;
2292 dst_hold(&from->dst);
2293 rt->dst.from = &from->dst;
2294 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2295 }
2296
2297 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2298 {
2299 rt->dst.input = ort->dst.input;
2300 rt->dst.output = ort->dst.output;
2301 rt->rt6i_dst = ort->rt6i_dst;
2302 rt->dst.error = ort->dst.error;
2303 rt->rt6i_idev = ort->rt6i_idev;
2304 if (rt->rt6i_idev)
2305 in6_dev_hold(rt->rt6i_idev);
2306 rt->dst.lastuse = jiffies;
2307 rt->rt6i_gateway = ort->rt6i_gateway;
2308 rt->rt6i_flags = ort->rt6i_flags;
2309 rt6_set_from(rt, ort);
2310 rt->rt6i_metric = ort->rt6i_metric;
2311 #ifdef CONFIG_IPV6_SUBTREES
2312 rt->rt6i_src = ort->rt6i_src;
2313 #endif
2314 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2315 rt->rt6i_table = ort->rt6i_table;
2316 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2317 }
2318
2319 #ifdef CONFIG_IPV6_ROUTE_INFO
2320 static struct rt6_info *rt6_get_route_info(struct net *net,
2321 const struct in6_addr *prefix, int prefixlen,
2322 const struct in6_addr *gwaddr, int ifindex)
2323 {
2324 struct fib6_node *fn;
2325 struct rt6_info *rt = NULL;
2326 struct fib6_table *table;
2327
2328 table = fib6_get_table(net, RT6_TABLE_INFO);
2329 if (!table)
2330 return NULL;
2331
2332 read_lock_bh(&table->tb6_lock);
2333 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2334 if (!fn)
2335 goto out;
2336
2337 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2338 if (rt->dst.dev->ifindex != ifindex)
2339 continue;
2340 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2341 continue;
2342 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2343 continue;
2344 dst_hold(&rt->dst);
2345 break;
2346 }
2347 out:
2348 read_unlock_bh(&table->tb6_lock);
2349 return rt;
2350 }
2351
2352 static struct rt6_info *rt6_add_route_info(struct net *net,
2353 const struct in6_addr *prefix, int prefixlen,
2354 const struct in6_addr *gwaddr, int ifindex,
2355 unsigned int pref)
2356 {
2357 struct fib6_config cfg = {
2358 .fc_metric = IP6_RT_PRIO_USER,
2359 .fc_ifindex = ifindex,
2360 .fc_dst_len = prefixlen,
2361 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2362 RTF_UP | RTF_PREF(pref),
2363 .fc_nlinfo.portid = 0,
2364 .fc_nlinfo.nlh = NULL,
2365 .fc_nlinfo.nl_net = net,
2366 };
2367
2368 cfg.fc_table = l3mdev_fib_table_by_index(net, ifindex) ? : RT6_TABLE_INFO;
2369 cfg.fc_dst = *prefix;
2370 cfg.fc_gateway = *gwaddr;
2371
2372 /* We should treat it as a default route if prefix length is 0. */
2373 if (!prefixlen)
2374 cfg.fc_flags |= RTF_DEFAULT;
2375
2376 ip6_route_add(&cfg);
2377
2378 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
2379 }
2380 #endif
2381
2382 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2383 {
2384 struct rt6_info *rt;
2385 struct fib6_table *table;
2386
2387 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
2388 if (!table)
2389 return NULL;
2390
2391 read_lock_bh(&table->tb6_lock);
2392 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2393 if (dev == rt->dst.dev &&
2394 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2395 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2396 break;
2397 }
2398 if (rt)
2399 dst_hold(&rt->dst);
2400 read_unlock_bh(&table->tb6_lock);
2401 return rt;
2402 }
2403
2404 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2405 struct net_device *dev,
2406 unsigned int pref)
2407 {
2408 struct fib6_config cfg = {
2409 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2410 .fc_metric = IP6_RT_PRIO_USER,
2411 .fc_ifindex = dev->ifindex,
2412 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2413 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2414 .fc_nlinfo.portid = 0,
2415 .fc_nlinfo.nlh = NULL,
2416 .fc_nlinfo.nl_net = dev_net(dev),
2417 };
2418
2419 cfg.fc_gateway = *gwaddr;
2420
2421 ip6_route_add(&cfg);
2422
2423 return rt6_get_dflt_router(gwaddr, dev);
2424 }
2425
2426 void rt6_purge_dflt_routers(struct net *net)
2427 {
2428 struct rt6_info *rt;
2429 struct fib6_table *table;
2430
2431 /* NOTE: Keep consistent with rt6_get_dflt_router */
2432 table = fib6_get_table(net, RT6_TABLE_DFLT);
2433 if (!table)
2434 return;
2435
2436 restart:
2437 read_lock_bh(&table->tb6_lock);
2438 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2439 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2440 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2441 dst_hold(&rt->dst);
2442 read_unlock_bh(&table->tb6_lock);
2443 ip6_del_rt(rt);
2444 goto restart;
2445 }
2446 }
2447 read_unlock_bh(&table->tb6_lock);
2448 }
2449
2450 static void rtmsg_to_fib6_config(struct net *net,
2451 struct in6_rtmsg *rtmsg,
2452 struct fib6_config *cfg)
2453 {
2454 memset(cfg, 0, sizeof(*cfg));
2455
2456 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2457 : RT6_TABLE_MAIN;
2458 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2459 cfg->fc_metric = rtmsg->rtmsg_metric;
2460 cfg->fc_expires = rtmsg->rtmsg_info;
2461 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2462 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2463 cfg->fc_flags = rtmsg->rtmsg_flags;
2464
2465 cfg->fc_nlinfo.nl_net = net;
2466
2467 cfg->fc_dst = rtmsg->rtmsg_dst;
2468 cfg->fc_src = rtmsg->rtmsg_src;
2469 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2470 }
2471
2472 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2473 {
2474 struct fib6_config cfg;
2475 struct in6_rtmsg rtmsg;
2476 int err;
2477
2478 switch (cmd) {
2479 case SIOCADDRT: /* Add a route */
2480 case SIOCDELRT: /* Delete a route */
2481 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2482 return -EPERM;
2483 err = copy_from_user(&rtmsg, arg,
2484 sizeof(struct in6_rtmsg));
2485 if (err)
2486 return -EFAULT;
2487
2488 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2489
2490 rtnl_lock();
2491 switch (cmd) {
2492 case SIOCADDRT:
2493 err = ip6_route_add(&cfg);
2494 break;
2495 case SIOCDELRT:
2496 err = ip6_route_del(&cfg);
2497 break;
2498 default:
2499 err = -EINVAL;
2500 }
2501 rtnl_unlock();
2502
2503 return err;
2504 }
2505
2506 return -EINVAL;
2507 }
2508
2509 /*
2510 * Drop the packet on the floor
2511 */
2512
2513 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2514 {
2515 int type;
2516 struct dst_entry *dst = skb_dst(skb);
2517 switch (ipstats_mib_noroutes) {
2518 case IPSTATS_MIB_INNOROUTES:
2519 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2520 if (type == IPV6_ADDR_ANY) {
2521 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2522 IPSTATS_MIB_INADDRERRORS);
2523 break;
2524 }
2525 /* FALLTHROUGH */
2526 case IPSTATS_MIB_OUTNOROUTES:
2527 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2528 ipstats_mib_noroutes);
2529 break;
2530 }
2531 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2532 kfree_skb(skb);
2533 return 0;
2534 }
2535
2536 static int ip6_pkt_discard(struct sk_buff *skb)
2537 {
2538 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2539 }
2540
2541 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2542 {
2543 skb->dev = skb_dst(skb)->dev;
2544 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2545 }
2546
2547 static int ip6_pkt_prohibit(struct sk_buff *skb)
2548 {
2549 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2550 }
2551
2552 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2553 {
2554 skb->dev = skb_dst(skb)->dev;
2555 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2556 }
2557
2558 /*
2559 * Allocate a dst for local (unicast / anycast) address.
2560 */
2561
2562 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2563 const struct in6_addr *addr,
2564 bool anycast)
2565 {
2566 u32 tb_id;
2567 struct net *net = dev_net(idev->dev);
2568 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2569 DST_NOCOUNT);
2570 if (!rt)
2571 return ERR_PTR(-ENOMEM);
2572
2573 in6_dev_hold(idev);
2574
2575 rt->dst.flags |= DST_HOST;
2576 rt->dst.input = ip6_input;
2577 rt->dst.output = ip6_output;
2578 rt->rt6i_idev = idev;
2579
2580 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2581 if (anycast)
2582 rt->rt6i_flags |= RTF_ANYCAST;
2583 else
2584 rt->rt6i_flags |= RTF_LOCAL;
2585
2586 rt->rt6i_gateway = *addr;
2587 rt->rt6i_dst.addr = *addr;
2588 rt->rt6i_dst.plen = 128;
2589 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2590 rt->rt6i_table = fib6_get_table(net, tb_id);
2591 rt->dst.flags |= DST_NOCACHE;
2592
2593 atomic_set(&rt->dst.__refcnt, 1);
2594
2595 return rt;
2596 }
2597
2598 /* remove deleted ip from prefsrc entries */
2599 struct arg_dev_net_ip {
2600 struct net_device *dev;
2601 struct net *net;
2602 struct in6_addr *addr;
2603 };
2604
2605 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2606 {
2607 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2608 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2609 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2610
2611 if (((void *)rt->dst.dev == dev || !dev) &&
2612 rt != net->ipv6.ip6_null_entry &&
2613 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2614 /* remove prefsrc entry */
2615 rt->rt6i_prefsrc.plen = 0;
2616 }
2617 return 0;
2618 }
2619
2620 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2621 {
2622 struct net *net = dev_net(ifp->idev->dev);
2623 struct arg_dev_net_ip adni = {
2624 .dev = ifp->idev->dev,
2625 .net = net,
2626 .addr = &ifp->addr,
2627 };
2628 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2629 }
2630
2631 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2632 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2633
2634 /* Remove routers and update dst entries when gateway turn into host. */
2635 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2636 {
2637 struct in6_addr *gateway = (struct in6_addr *)arg;
2638
2639 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2640 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2641 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2642 return -1;
2643 }
2644 return 0;
2645 }
2646
2647 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2648 {
2649 fib6_clean_all(net, fib6_clean_tohost, gateway);
2650 }
2651
2652 struct arg_dev_net {
2653 struct net_device *dev;
2654 struct net *net;
2655 };
2656
2657 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2658 {
2659 const struct arg_dev_net *adn = arg;
2660 const struct net_device *dev = adn->dev;
2661
2662 if ((rt->dst.dev == dev || !dev) &&
2663 rt != adn->net->ipv6.ip6_null_entry)
2664 return -1;
2665
2666 return 0;
2667 }
2668
2669 void rt6_ifdown(struct net *net, struct net_device *dev)
2670 {
2671 struct arg_dev_net adn = {
2672 .dev = dev,
2673 .net = net,
2674 };
2675
2676 fib6_clean_all(net, fib6_ifdown, &adn);
2677 icmp6_clean_all(fib6_ifdown, &adn);
2678 if (dev)
2679 rt6_uncached_list_flush_dev(net, dev);
2680 }
2681
2682 struct rt6_mtu_change_arg {
2683 struct net_device *dev;
2684 unsigned int mtu;
2685 };
2686
2687 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2688 {
2689 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2690 struct inet6_dev *idev;
2691
2692 /* In IPv6 pmtu discovery is not optional,
2693 so that RTAX_MTU lock cannot disable it.
2694 We still use this lock to block changes
2695 caused by addrconf/ndisc.
2696 */
2697
2698 idev = __in6_dev_get(arg->dev);
2699 if (!idev)
2700 return 0;
2701
2702 /* For administrative MTU increase, there is no way to discover
2703 IPv6 PMTU increase, so PMTU increase should be updated here.
2704 Since RFC 1981 doesn't include administrative MTU increase
2705 update PMTU increase is a MUST. (i.e. jumbo frame)
2706 */
2707 /*
2708 If new MTU is less than route PMTU, this new MTU will be the
2709 lowest MTU in the path, update the route PMTU to reflect PMTU
2710 decreases; if new MTU is greater than route PMTU, and the
2711 old MTU is the lowest MTU in the path, update the route PMTU
2712 to reflect the increase. In this case if the other nodes' MTU
2713 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2714 PMTU discouvery.
2715 */
2716 if (rt->dst.dev == arg->dev &&
2717 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2718 if (rt->rt6i_flags & RTF_CACHE) {
2719 /* For RTF_CACHE with rt6i_pmtu == 0
2720 * (i.e. a redirected route),
2721 * the metrics of its rt->dst.from has already
2722 * been updated.
2723 */
2724 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2725 rt->rt6i_pmtu = arg->mtu;
2726 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2727 (dst_mtu(&rt->dst) < arg->mtu &&
2728 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2729 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2730 }
2731 }
2732 return 0;
2733 }
2734
2735 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2736 {
2737 struct rt6_mtu_change_arg arg = {
2738 .dev = dev,
2739 .mtu = mtu,
2740 };
2741
2742 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2743 }
2744
2745 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2746 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2747 [RTA_OIF] = { .type = NLA_U32 },
2748 [RTA_IIF] = { .type = NLA_U32 },
2749 [RTA_PRIORITY] = { .type = NLA_U32 },
2750 [RTA_METRICS] = { .type = NLA_NESTED },
2751 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2752 [RTA_PREF] = { .type = NLA_U8 },
2753 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2754 [RTA_ENCAP] = { .type = NLA_NESTED },
2755 [RTA_EXPIRES] = { .type = NLA_U32 },
2756 };
2757
2758 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2759 struct fib6_config *cfg)
2760 {
2761 struct rtmsg *rtm;
2762 struct nlattr *tb[RTA_MAX+1];
2763 unsigned int pref;
2764 int err;
2765
2766 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2767 if (err < 0)
2768 goto errout;
2769
2770 err = -EINVAL;
2771 rtm = nlmsg_data(nlh);
2772 memset(cfg, 0, sizeof(*cfg));
2773
2774 cfg->fc_table = rtm->rtm_table;
2775 cfg->fc_dst_len = rtm->rtm_dst_len;
2776 cfg->fc_src_len = rtm->rtm_src_len;
2777 cfg->fc_flags = RTF_UP;
2778 cfg->fc_protocol = rtm->rtm_protocol;
2779 cfg->fc_type = rtm->rtm_type;
2780
2781 if (rtm->rtm_type == RTN_UNREACHABLE ||
2782 rtm->rtm_type == RTN_BLACKHOLE ||
2783 rtm->rtm_type == RTN_PROHIBIT ||
2784 rtm->rtm_type == RTN_THROW)
2785 cfg->fc_flags |= RTF_REJECT;
2786
2787 if (rtm->rtm_type == RTN_LOCAL)
2788 cfg->fc_flags |= RTF_LOCAL;
2789
2790 if (rtm->rtm_flags & RTM_F_CLONED)
2791 cfg->fc_flags |= RTF_CACHE;
2792
2793 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2794 cfg->fc_nlinfo.nlh = nlh;
2795 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2796
2797 if (tb[RTA_GATEWAY]) {
2798 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2799 cfg->fc_flags |= RTF_GATEWAY;
2800 }
2801
2802 if (tb[RTA_DST]) {
2803 int plen = (rtm->rtm_dst_len + 7) >> 3;
2804
2805 if (nla_len(tb[RTA_DST]) < plen)
2806 goto errout;
2807
2808 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2809 }
2810
2811 if (tb[RTA_SRC]) {
2812 int plen = (rtm->rtm_src_len + 7) >> 3;
2813
2814 if (nla_len(tb[RTA_SRC]) < plen)
2815 goto errout;
2816
2817 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2818 }
2819
2820 if (tb[RTA_PREFSRC])
2821 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2822
2823 if (tb[RTA_OIF])
2824 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2825
2826 if (tb[RTA_PRIORITY])
2827 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2828
2829 if (tb[RTA_METRICS]) {
2830 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2831 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2832 }
2833
2834 if (tb[RTA_TABLE])
2835 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2836
2837 if (tb[RTA_MULTIPATH]) {
2838 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2839 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2840 }
2841
2842 if (tb[RTA_PREF]) {
2843 pref = nla_get_u8(tb[RTA_PREF]);
2844 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2845 pref != ICMPV6_ROUTER_PREF_HIGH)
2846 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2847 cfg->fc_flags |= RTF_PREF(pref);
2848 }
2849
2850 if (tb[RTA_ENCAP])
2851 cfg->fc_encap = tb[RTA_ENCAP];
2852
2853 if (tb[RTA_ENCAP_TYPE])
2854 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2855
2856 if (tb[RTA_EXPIRES]) {
2857 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
2858
2859 if (addrconf_finite_timeout(timeout)) {
2860 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
2861 cfg->fc_flags |= RTF_EXPIRES;
2862 }
2863 }
2864
2865 err = 0;
2866 errout:
2867 return err;
2868 }
2869
2870 struct rt6_nh {
2871 struct rt6_info *rt6_info;
2872 struct fib6_config r_cfg;
2873 struct mx6_config mxc;
2874 struct list_head next;
2875 };
2876
2877 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
2878 {
2879 struct rt6_nh *nh;
2880
2881 list_for_each_entry(nh, rt6_nh_list, next) {
2882 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
2883 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
2884 nh->r_cfg.fc_ifindex);
2885 }
2886 }
2887
2888 static int ip6_route_info_append(struct list_head *rt6_nh_list,
2889 struct rt6_info *rt, struct fib6_config *r_cfg)
2890 {
2891 struct rt6_nh *nh;
2892 struct rt6_info *rtnh;
2893 int err = -EEXIST;
2894
2895 list_for_each_entry(nh, rt6_nh_list, next) {
2896 /* check if rt6_info already exists */
2897 rtnh = nh->rt6_info;
2898
2899 if (rtnh->dst.dev == rt->dst.dev &&
2900 rtnh->rt6i_idev == rt->rt6i_idev &&
2901 ipv6_addr_equal(&rtnh->rt6i_gateway,
2902 &rt->rt6i_gateway))
2903 return err;
2904 }
2905
2906 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
2907 if (!nh)
2908 return -ENOMEM;
2909 nh->rt6_info = rt;
2910 err = ip6_convert_metrics(&nh->mxc, r_cfg);
2911 if (err) {
2912 kfree(nh);
2913 return err;
2914 }
2915 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
2916 list_add_tail(&nh->next, rt6_nh_list);
2917
2918 return 0;
2919 }
2920
2921 static int ip6_route_multipath_add(struct fib6_config *cfg)
2922 {
2923 struct fib6_config r_cfg;
2924 struct rtnexthop *rtnh;
2925 struct rt6_info *rt;
2926 struct rt6_nh *err_nh;
2927 struct rt6_nh *nh, *nh_safe;
2928 int remaining;
2929 int attrlen;
2930 int err = 1;
2931 int nhn = 0;
2932 int replace = (cfg->fc_nlinfo.nlh &&
2933 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
2934 LIST_HEAD(rt6_nh_list);
2935
2936 remaining = cfg->fc_mp_len;
2937 rtnh = (struct rtnexthop *)cfg->fc_mp;
2938
2939 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
2940 * rt6_info structs per nexthop
2941 */
2942 while (rtnh_ok(rtnh, remaining)) {
2943 memcpy(&r_cfg, cfg, sizeof(*cfg));
2944 if (rtnh->rtnh_ifindex)
2945 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2946
2947 attrlen = rtnh_attrlen(rtnh);
2948 if (attrlen > 0) {
2949 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2950
2951 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2952 if (nla) {
2953 r_cfg.fc_gateway = nla_get_in6_addr(nla);
2954 r_cfg.fc_flags |= RTF_GATEWAY;
2955 }
2956 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
2957 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
2958 if (nla)
2959 r_cfg.fc_encap_type = nla_get_u16(nla);
2960 }
2961
2962 rt = ip6_route_info_create(&r_cfg);
2963 if (IS_ERR(rt)) {
2964 err = PTR_ERR(rt);
2965 rt = NULL;
2966 goto cleanup;
2967 }
2968
2969 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
2970 if (err) {
2971 dst_free(&rt->dst);
2972 goto cleanup;
2973 }
2974
2975 rtnh = rtnh_next(rtnh, &remaining);
2976 }
2977
2978 err_nh = NULL;
2979 list_for_each_entry(nh, &rt6_nh_list, next) {
2980 err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
2981 /* nh->rt6_info is used or freed at this point, reset to NULL*/
2982 nh->rt6_info = NULL;
2983 if (err) {
2984 if (replace && nhn)
2985 ip6_print_replace_route_err(&rt6_nh_list);
2986 err_nh = nh;
2987 goto add_errout;
2988 }
2989
2990 /* Because each route is added like a single route we remove
2991 * these flags after the first nexthop: if there is a collision,
2992 * we have already failed to add the first nexthop:
2993 * fib6_add_rt2node() has rejected it; when replacing, old
2994 * nexthops have been replaced by first new, the rest should
2995 * be added to it.
2996 */
2997 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
2998 NLM_F_REPLACE);
2999 nhn++;
3000 }
3001
3002 goto cleanup;
3003
3004 add_errout:
3005 /* Delete routes that were already added */
3006 list_for_each_entry(nh, &rt6_nh_list, next) {
3007 if (err_nh == nh)
3008 break;
3009 ip6_route_del(&nh->r_cfg);
3010 }
3011
3012 cleanup:
3013 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3014 if (nh->rt6_info)
3015 dst_free(&nh->rt6_info->dst);
3016 kfree(nh->mxc.mx);
3017 list_del(&nh->next);
3018 kfree(nh);
3019 }
3020
3021 return err;
3022 }
3023
3024 static int ip6_route_multipath_del(struct fib6_config *cfg)
3025 {
3026 struct fib6_config r_cfg;
3027 struct rtnexthop *rtnh;
3028 int remaining;
3029 int attrlen;
3030 int err = 1, last_err = 0;
3031
3032 remaining = cfg->fc_mp_len;
3033 rtnh = (struct rtnexthop *)cfg->fc_mp;
3034
3035 /* Parse a Multipath Entry */
3036 while (rtnh_ok(rtnh, remaining)) {
3037 memcpy(&r_cfg, cfg, sizeof(*cfg));
3038 if (rtnh->rtnh_ifindex)
3039 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3040
3041 attrlen = rtnh_attrlen(rtnh);
3042 if (attrlen > 0) {
3043 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3044
3045 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3046 if (nla) {
3047 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3048 r_cfg.fc_flags |= RTF_GATEWAY;
3049 }
3050 }
3051 err = ip6_route_del(&r_cfg);
3052 if (err)
3053 last_err = err;
3054
3055 rtnh = rtnh_next(rtnh, &remaining);
3056 }
3057
3058 return last_err;
3059 }
3060
3061 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3062 {
3063 struct fib6_config cfg;
3064 int err;
3065
3066 err = rtm_to_fib6_config(skb, nlh, &cfg);
3067 if (err < 0)
3068 return err;
3069
3070 if (cfg.fc_mp)
3071 return ip6_route_multipath_del(&cfg);
3072 else
3073 return ip6_route_del(&cfg);
3074 }
3075
3076 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3077 {
3078 struct fib6_config cfg;
3079 int err;
3080
3081 err = rtm_to_fib6_config(skb, nlh, &cfg);
3082 if (err < 0)
3083 return err;
3084
3085 if (cfg.fc_mp)
3086 return ip6_route_multipath_add(&cfg);
3087 else
3088 return ip6_route_add(&cfg);
3089 }
3090
3091 static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
3092 {
3093 return NLMSG_ALIGN(sizeof(struct rtmsg))
3094 + nla_total_size(16) /* RTA_SRC */
3095 + nla_total_size(16) /* RTA_DST */
3096 + nla_total_size(16) /* RTA_GATEWAY */
3097 + nla_total_size(16) /* RTA_PREFSRC */
3098 + nla_total_size(4) /* RTA_TABLE */
3099 + nla_total_size(4) /* RTA_IIF */
3100 + nla_total_size(4) /* RTA_OIF */
3101 + nla_total_size(4) /* RTA_PRIORITY */
3102 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3103 + nla_total_size(sizeof(struct rta_cacheinfo))
3104 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3105 + nla_total_size(1) /* RTA_PREF */
3106 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3107 }
3108
3109 static int rt6_fill_node(struct net *net,
3110 struct sk_buff *skb, struct rt6_info *rt,
3111 struct in6_addr *dst, struct in6_addr *src,
3112 int iif, int type, u32 portid, u32 seq,
3113 int prefix, int nowait, unsigned int flags)
3114 {
3115 u32 metrics[RTAX_MAX];
3116 struct rtmsg *rtm;
3117 struct nlmsghdr *nlh;
3118 long expires;
3119 u32 table;
3120
3121 if (prefix) { /* user wants prefix routes only */
3122 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
3123 /* success since this is not a prefix route */
3124 return 1;
3125 }
3126 }
3127
3128 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3129 if (!nlh)
3130 return -EMSGSIZE;
3131
3132 rtm = nlmsg_data(nlh);
3133 rtm->rtm_family = AF_INET6;
3134 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3135 rtm->rtm_src_len = rt->rt6i_src.plen;
3136 rtm->rtm_tos = 0;
3137 if (rt->rt6i_table)
3138 table = rt->rt6i_table->tb6_id;
3139 else
3140 table = RT6_TABLE_UNSPEC;
3141 rtm->rtm_table = table;
3142 if (nla_put_u32(skb, RTA_TABLE, table))
3143 goto nla_put_failure;
3144 if (rt->rt6i_flags & RTF_REJECT) {
3145 switch (rt->dst.error) {
3146 case -EINVAL:
3147 rtm->rtm_type = RTN_BLACKHOLE;
3148 break;
3149 case -EACCES:
3150 rtm->rtm_type = RTN_PROHIBIT;
3151 break;
3152 case -EAGAIN:
3153 rtm->rtm_type = RTN_THROW;
3154 break;
3155 default:
3156 rtm->rtm_type = RTN_UNREACHABLE;
3157 break;
3158 }
3159 }
3160 else if (rt->rt6i_flags & RTF_LOCAL)
3161 rtm->rtm_type = RTN_LOCAL;
3162 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3163 rtm->rtm_type = RTN_LOCAL;
3164 else
3165 rtm->rtm_type = RTN_UNICAST;
3166 rtm->rtm_flags = 0;
3167 if (!netif_carrier_ok(rt->dst.dev)) {
3168 rtm->rtm_flags |= RTNH_F_LINKDOWN;
3169 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3170 rtm->rtm_flags |= RTNH_F_DEAD;
3171 }
3172 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3173 rtm->rtm_protocol = rt->rt6i_protocol;
3174 if (rt->rt6i_flags & RTF_DYNAMIC)
3175 rtm->rtm_protocol = RTPROT_REDIRECT;
3176 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3177 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3178 rtm->rtm_protocol = RTPROT_RA;
3179 else
3180 rtm->rtm_protocol = RTPROT_KERNEL;
3181 }
3182
3183 if (rt->rt6i_flags & RTF_CACHE)
3184 rtm->rtm_flags |= RTM_F_CLONED;
3185
3186 if (dst) {
3187 if (nla_put_in6_addr(skb, RTA_DST, dst))
3188 goto nla_put_failure;
3189 rtm->rtm_dst_len = 128;
3190 } else if (rtm->rtm_dst_len)
3191 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3192 goto nla_put_failure;
3193 #ifdef CONFIG_IPV6_SUBTREES
3194 if (src) {
3195 if (nla_put_in6_addr(skb, RTA_SRC, src))
3196 goto nla_put_failure;
3197 rtm->rtm_src_len = 128;
3198 } else if (rtm->rtm_src_len &&
3199 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3200 goto nla_put_failure;
3201 #endif
3202 if (iif) {
3203 #ifdef CONFIG_IPV6_MROUTE
3204 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3205 int err = ip6mr_get_route(net, skb, rtm, nowait);
3206 if (err <= 0) {
3207 if (!nowait) {
3208 if (err == 0)
3209 return 0;
3210 goto nla_put_failure;
3211 } else {
3212 if (err == -EMSGSIZE)
3213 goto nla_put_failure;
3214 }
3215 }
3216 } else
3217 #endif
3218 if (nla_put_u32(skb, RTA_IIF, iif))
3219 goto nla_put_failure;
3220 } else if (dst) {
3221 struct in6_addr saddr_buf;
3222 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3223 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3224 goto nla_put_failure;
3225 }
3226
3227 if (rt->rt6i_prefsrc.plen) {
3228 struct in6_addr saddr_buf;
3229 saddr_buf = rt->rt6i_prefsrc.addr;
3230 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3231 goto nla_put_failure;
3232 }
3233
3234 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3235 if (rt->rt6i_pmtu)
3236 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3237 if (rtnetlink_put_metrics(skb, metrics) < 0)
3238 goto nla_put_failure;
3239
3240 if (rt->rt6i_flags & RTF_GATEWAY) {
3241 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3242 goto nla_put_failure;
3243 }
3244
3245 if (rt->dst.dev &&
3246 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3247 goto nla_put_failure;
3248 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3249 goto nla_put_failure;
3250
3251 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3252
3253 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3254 goto nla_put_failure;
3255
3256 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3257 goto nla_put_failure;
3258
3259 lwtunnel_fill_encap(skb, rt->dst.lwtstate);
3260
3261 nlmsg_end(skb, nlh);
3262 return 0;
3263
3264 nla_put_failure:
3265 nlmsg_cancel(skb, nlh);
3266 return -EMSGSIZE;
3267 }
3268
3269 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3270 {
3271 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3272 int prefix;
3273
3274 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3275 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3276 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
3277 } else
3278 prefix = 0;
3279
3280 return rt6_fill_node(arg->net,
3281 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3282 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3283 prefix, 0, NLM_F_MULTI);
3284 }
3285
3286 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3287 {
3288 struct net *net = sock_net(in_skb->sk);
3289 struct nlattr *tb[RTA_MAX+1];
3290 struct rt6_info *rt;
3291 struct sk_buff *skb;
3292 struct rtmsg *rtm;
3293 struct flowi6 fl6;
3294 int err, iif = 0, oif = 0;
3295
3296 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3297 if (err < 0)
3298 goto errout;
3299
3300 err = -EINVAL;
3301 memset(&fl6, 0, sizeof(fl6));
3302 rtm = nlmsg_data(nlh);
3303 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
3304
3305 if (tb[RTA_SRC]) {
3306 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3307 goto errout;
3308
3309 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3310 }
3311
3312 if (tb[RTA_DST]) {
3313 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3314 goto errout;
3315
3316 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3317 }
3318
3319 if (tb[RTA_IIF])
3320 iif = nla_get_u32(tb[RTA_IIF]);
3321
3322 if (tb[RTA_OIF])
3323 oif = nla_get_u32(tb[RTA_OIF]);
3324
3325 if (tb[RTA_MARK])
3326 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3327
3328 if (iif) {
3329 struct net_device *dev;
3330 int flags = 0;
3331
3332 dev = __dev_get_by_index(net, iif);
3333 if (!dev) {
3334 err = -ENODEV;
3335 goto errout;
3336 }
3337
3338 fl6.flowi6_iif = iif;
3339
3340 if (!ipv6_addr_any(&fl6.saddr))
3341 flags |= RT6_LOOKUP_F_HAS_SADDR;
3342
3343 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3344 flags);
3345 } else {
3346 fl6.flowi6_oif = oif;
3347
3348 if (netif_index_is_l3_master(net, oif)) {
3349 fl6.flowi6_flags = FLOWI_FLAG_L3MDEV_SRC |
3350 FLOWI_FLAG_SKIP_NH_OIF;
3351 }
3352
3353 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3354 }
3355
3356 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3357 if (!skb) {
3358 ip6_rt_put(rt);
3359 err = -ENOBUFS;
3360 goto errout;
3361 }
3362
3363 /* Reserve room for dummy headers, this skb can pass
3364 through good chunk of routing engine.
3365 */
3366 skb_reset_mac_header(skb);
3367 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
3368
3369 skb_dst_set(skb, &rt->dst);
3370
3371 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3372 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3373 nlh->nlmsg_seq, 0, 0, 0);
3374 if (err < 0) {
3375 kfree_skb(skb);
3376 goto errout;
3377 }
3378
3379 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3380 errout:
3381 return err;
3382 }
3383
3384 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3385 unsigned int nlm_flags)
3386 {
3387 struct sk_buff *skb;
3388 struct net *net = info->nl_net;
3389 u32 seq;
3390 int err;
3391
3392 err = -ENOBUFS;
3393 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3394
3395 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3396 if (!skb)
3397 goto errout;
3398
3399 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3400 event, info->portid, seq, 0, 0, nlm_flags);
3401 if (err < 0) {
3402 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3403 WARN_ON(err == -EMSGSIZE);
3404 kfree_skb(skb);
3405 goto errout;
3406 }
3407 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3408 info->nlh, gfp_any());
3409 return;
3410 errout:
3411 if (err < 0)
3412 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3413 }
3414
3415 static int ip6_route_dev_notify(struct notifier_block *this,
3416 unsigned long event, void *ptr)
3417 {
3418 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3419 struct net *net = dev_net(dev);
3420
3421 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3422 net->ipv6.ip6_null_entry->dst.dev = dev;
3423 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3424 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3425 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3426 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3427 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3428 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3429 #endif
3430 }
3431
3432 return NOTIFY_OK;
3433 }
3434
3435 /*
3436 * /proc
3437 */
3438
3439 #ifdef CONFIG_PROC_FS
3440
3441 static const struct file_operations ipv6_route_proc_fops = {
3442 .owner = THIS_MODULE,
3443 .open = ipv6_route_open,
3444 .read = seq_read,
3445 .llseek = seq_lseek,
3446 .release = seq_release_net,
3447 };
3448
3449 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3450 {
3451 struct net *net = (struct net *)seq->private;
3452 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3453 net->ipv6.rt6_stats->fib_nodes,
3454 net->ipv6.rt6_stats->fib_route_nodes,
3455 net->ipv6.rt6_stats->fib_rt_alloc,
3456 net->ipv6.rt6_stats->fib_rt_entries,
3457 net->ipv6.rt6_stats->fib_rt_cache,
3458 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3459 net->ipv6.rt6_stats->fib_discarded_routes);
3460
3461 return 0;
3462 }
3463
3464 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3465 {
3466 return single_open_net(inode, file, rt6_stats_seq_show);
3467 }
3468
3469 static const struct file_operations rt6_stats_seq_fops = {
3470 .owner = THIS_MODULE,
3471 .open = rt6_stats_seq_open,
3472 .read = seq_read,
3473 .llseek = seq_lseek,
3474 .release = single_release_net,
3475 };
3476 #endif /* CONFIG_PROC_FS */
3477
3478 #ifdef CONFIG_SYSCTL
3479
3480 static
3481 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3482 void __user *buffer, size_t *lenp, loff_t *ppos)
3483 {
3484 struct net *net;
3485 int delay;
3486 if (!write)
3487 return -EINVAL;
3488
3489 net = (struct net *)ctl->extra1;
3490 delay = net->ipv6.sysctl.flush_delay;
3491 proc_dointvec(ctl, write, buffer, lenp, ppos);
3492 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3493 return 0;
3494 }
3495
3496 struct ctl_table ipv6_route_table_template[] = {
3497 {
3498 .procname = "flush",
3499 .data = &init_net.ipv6.sysctl.flush_delay,
3500 .maxlen = sizeof(int),
3501 .mode = 0200,
3502 .proc_handler = ipv6_sysctl_rtcache_flush
3503 },
3504 {
3505 .procname = "gc_thresh",
3506 .data = &ip6_dst_ops_template.gc_thresh,
3507 .maxlen = sizeof(int),
3508 .mode = 0644,
3509 .proc_handler = proc_dointvec,
3510 },
3511 {
3512 .procname = "max_size",
3513 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3514 .maxlen = sizeof(int),
3515 .mode = 0644,
3516 .proc_handler = proc_dointvec,
3517 },
3518 {
3519 .procname = "gc_min_interval",
3520 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3521 .maxlen = sizeof(int),
3522 .mode = 0644,
3523 .proc_handler = proc_dointvec_jiffies,
3524 },
3525 {
3526 .procname = "gc_timeout",
3527 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3528 .maxlen = sizeof(int),
3529 .mode = 0644,
3530 .proc_handler = proc_dointvec_jiffies,
3531 },
3532 {
3533 .procname = "gc_interval",
3534 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3535 .maxlen = sizeof(int),
3536 .mode = 0644,
3537 .proc_handler = proc_dointvec_jiffies,
3538 },
3539 {
3540 .procname = "gc_elasticity",
3541 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3542 .maxlen = sizeof(int),
3543 .mode = 0644,
3544 .proc_handler = proc_dointvec,
3545 },
3546 {
3547 .procname = "mtu_expires",
3548 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3549 .maxlen = sizeof(int),
3550 .mode = 0644,
3551 .proc_handler = proc_dointvec_jiffies,
3552 },
3553 {
3554 .procname = "min_adv_mss",
3555 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3556 .maxlen = sizeof(int),
3557 .mode = 0644,
3558 .proc_handler = proc_dointvec,
3559 },
3560 {
3561 .procname = "gc_min_interval_ms",
3562 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3563 .maxlen = sizeof(int),
3564 .mode = 0644,
3565 .proc_handler = proc_dointvec_ms_jiffies,
3566 },
3567 { }
3568 };
3569
3570 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3571 {
3572 struct ctl_table *table;
3573
3574 table = kmemdup(ipv6_route_table_template,
3575 sizeof(ipv6_route_table_template),
3576 GFP_KERNEL);
3577
3578 if (table) {
3579 table[0].data = &net->ipv6.sysctl.flush_delay;
3580 table[0].extra1 = net;
3581 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3582 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3583 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3584 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3585 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3586 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3587 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3588 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3589 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3590
3591 /* Don't export sysctls to unprivileged users */
3592 if (net->user_ns != &init_user_ns)
3593 table[0].procname = NULL;
3594 }
3595
3596 return table;
3597 }
3598 #endif
3599
3600 static int __net_init ip6_route_net_init(struct net *net)
3601 {
3602 int ret = -ENOMEM;
3603
3604 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3605 sizeof(net->ipv6.ip6_dst_ops));
3606
3607 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3608 goto out_ip6_dst_ops;
3609
3610 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3611 sizeof(*net->ipv6.ip6_null_entry),
3612 GFP_KERNEL);
3613 if (!net->ipv6.ip6_null_entry)
3614 goto out_ip6_dst_entries;
3615 net->ipv6.ip6_null_entry->dst.path =
3616 (struct dst_entry *)net->ipv6.ip6_null_entry;
3617 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3618 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3619 ip6_template_metrics, true);
3620
3621 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3622 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3623 sizeof(*net->ipv6.ip6_prohibit_entry),
3624 GFP_KERNEL);
3625 if (!net->ipv6.ip6_prohibit_entry)
3626 goto out_ip6_null_entry;
3627 net->ipv6.ip6_prohibit_entry->dst.path =
3628 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3629 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3630 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3631 ip6_template_metrics, true);
3632
3633 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3634 sizeof(*net->ipv6.ip6_blk_hole_entry),
3635 GFP_KERNEL);
3636 if (!net->ipv6.ip6_blk_hole_entry)
3637 goto out_ip6_prohibit_entry;
3638 net->ipv6.ip6_blk_hole_entry->dst.path =
3639 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3640 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3641 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3642 ip6_template_metrics, true);
3643 #endif
3644
3645 net->ipv6.sysctl.flush_delay = 0;
3646 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3647 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3648 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3649 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3650 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3651 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3652 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3653
3654 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3655
3656 ret = 0;
3657 out:
3658 return ret;
3659
3660 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3661 out_ip6_prohibit_entry:
3662 kfree(net->ipv6.ip6_prohibit_entry);
3663 out_ip6_null_entry:
3664 kfree(net->ipv6.ip6_null_entry);
3665 #endif
3666 out_ip6_dst_entries:
3667 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3668 out_ip6_dst_ops:
3669 goto out;
3670 }
3671
3672 static void __net_exit ip6_route_net_exit(struct net *net)
3673 {
3674 kfree(net->ipv6.ip6_null_entry);
3675 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3676 kfree(net->ipv6.ip6_prohibit_entry);
3677 kfree(net->ipv6.ip6_blk_hole_entry);
3678 #endif
3679 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3680 }
3681
3682 static int __net_init ip6_route_net_init_late(struct net *net)
3683 {
3684 #ifdef CONFIG_PROC_FS
3685 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3686 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3687 #endif
3688 return 0;
3689 }
3690
3691 static void __net_exit ip6_route_net_exit_late(struct net *net)
3692 {
3693 #ifdef CONFIG_PROC_FS
3694 remove_proc_entry("ipv6_route", net->proc_net);
3695 remove_proc_entry("rt6_stats", net->proc_net);
3696 #endif
3697 }
3698
3699 static struct pernet_operations ip6_route_net_ops = {
3700 .init = ip6_route_net_init,
3701 .exit = ip6_route_net_exit,
3702 };
3703
3704 static int __net_init ipv6_inetpeer_init(struct net *net)
3705 {
3706 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3707
3708 if (!bp)
3709 return -ENOMEM;
3710 inet_peer_base_init(bp);
3711 net->ipv6.peers = bp;
3712 return 0;
3713 }
3714
3715 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3716 {
3717 struct inet_peer_base *bp = net->ipv6.peers;
3718
3719 net->ipv6.peers = NULL;
3720 inetpeer_invalidate_tree(bp);
3721 kfree(bp);
3722 }
3723
3724 static struct pernet_operations ipv6_inetpeer_ops = {
3725 .init = ipv6_inetpeer_init,
3726 .exit = ipv6_inetpeer_exit,
3727 };
3728
3729 static struct pernet_operations ip6_route_net_late_ops = {
3730 .init = ip6_route_net_init_late,
3731 .exit = ip6_route_net_exit_late,
3732 };
3733
3734 static struct notifier_block ip6_route_dev_notifier = {
3735 .notifier_call = ip6_route_dev_notify,
3736 .priority = 0,
3737 };
3738
3739 int __init ip6_route_init(void)
3740 {
3741 int ret;
3742 int cpu;
3743
3744 ret = -ENOMEM;
3745 ip6_dst_ops_template.kmem_cachep =
3746 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3747 SLAB_HWCACHE_ALIGN, NULL);
3748 if (!ip6_dst_ops_template.kmem_cachep)
3749 goto out;
3750
3751 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3752 if (ret)
3753 goto out_kmem_cache;
3754
3755 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3756 if (ret)
3757 goto out_dst_entries;
3758
3759 ret = register_pernet_subsys(&ip6_route_net_ops);
3760 if (ret)
3761 goto out_register_inetpeer;
3762
3763 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3764
3765 /* Registering of the loopback is done before this portion of code,
3766 * the loopback reference in rt6_info will not be taken, do it
3767 * manually for init_net */
3768 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3769 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3770 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3771 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3772 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3773 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3774 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3775 #endif
3776 ret = fib6_init();
3777 if (ret)
3778 goto out_register_subsys;
3779
3780 ret = xfrm6_init();
3781 if (ret)
3782 goto out_fib6_init;
3783
3784 ret = fib6_rules_init();
3785 if (ret)
3786 goto xfrm6_init;
3787
3788 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3789 if (ret)
3790 goto fib6_rules_init;
3791
3792 ret = -ENOBUFS;
3793 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3794 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3795 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3796 goto out_register_late_subsys;
3797
3798 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3799 if (ret)
3800 goto out_register_late_subsys;
3801
3802 for_each_possible_cpu(cpu) {
3803 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
3804
3805 INIT_LIST_HEAD(&ul->head);
3806 spin_lock_init(&ul->lock);
3807 }
3808
3809 out:
3810 return ret;
3811
3812 out_register_late_subsys:
3813 unregister_pernet_subsys(&ip6_route_net_late_ops);
3814 fib6_rules_init:
3815 fib6_rules_cleanup();
3816 xfrm6_init:
3817 xfrm6_fini();
3818 out_fib6_init:
3819 fib6_gc_cleanup();
3820 out_register_subsys:
3821 unregister_pernet_subsys(&ip6_route_net_ops);
3822 out_register_inetpeer:
3823 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3824 out_dst_entries:
3825 dst_entries_destroy(&ip6_dst_blackhole_ops);
3826 out_kmem_cache:
3827 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3828 goto out;
3829 }
3830
3831 void ip6_route_cleanup(void)
3832 {
3833 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3834 unregister_pernet_subsys(&ip6_route_net_late_ops);
3835 fib6_rules_cleanup();
3836 xfrm6_fini();
3837 fib6_gc_cleanup();
3838 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3839 unregister_pernet_subsys(&ip6_route_net_ops);
3840 dst_entries_destroy(&ip6_dst_blackhole_ops);
3841 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3842 }
Linux with added FPC-III support