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net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / route.c
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/dst_metadata.h>
58 #include <net/xfrm.h>
59 #include <net/netevent.h>
60 #include <net/netlink.h>
61 #include <net/nexthop.h>
62 #include <net/lwtunnel.h>
63 #include <net/ip_tunnels.h>
64 #include <net/l3mdev.h>
65 #include <trace/events/fib6.h>
66
67 #include <linux/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 static size_t rt6_nlmsg_size(struct rt6_info *rt);
102 static int rt6_fill_node(struct net *net,
103 struct sk_buff *skb, struct rt6_info *rt,
104 struct in6_addr *dst, struct in6_addr *src,
105 int iif, int type, u32 portid, u32 seq,
106 unsigned int flags);
107
108 #ifdef CONFIG_IPV6_ROUTE_INFO
109 static struct rt6_info *rt6_add_route_info(struct net *net,
110 const struct in6_addr *prefix, int prefixlen,
111 const struct in6_addr *gwaddr,
112 struct net_device *dev,
113 unsigned int pref);
114 static struct rt6_info *rt6_get_route_info(struct net *net,
115 const struct in6_addr *prefix, int prefixlen,
116 const struct in6_addr *gwaddr,
117 struct net_device *dev);
118 #endif
119
120 struct uncached_list {
121 spinlock_t lock;
122 struct list_head head;
123 };
124
125 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
126
127 static void rt6_uncached_list_add(struct rt6_info *rt)
128 {
129 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
130
131 rt->dst.flags |= DST_NOCACHE;
132 rt->rt6i_uncached_list = ul;
133
134 spin_lock_bh(&ul->lock);
135 list_add_tail(&rt->rt6i_uncached, &ul->head);
136 spin_unlock_bh(&ul->lock);
137 }
138
139 static void rt6_uncached_list_del(struct rt6_info *rt)
140 {
141 if (!list_empty(&rt->rt6i_uncached)) {
142 struct uncached_list *ul = rt->rt6i_uncached_list;
143
144 spin_lock_bh(&ul->lock);
145 list_del(&rt->rt6i_uncached);
146 spin_unlock_bh(&ul->lock);
147 }
148 }
149
150 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
151 {
152 struct net_device *loopback_dev = net->loopback_dev;
153 int cpu;
154
155 if (dev == loopback_dev)
156 return;
157
158 for_each_possible_cpu(cpu) {
159 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
160 struct rt6_info *rt;
161
162 spin_lock_bh(&ul->lock);
163 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
164 struct inet6_dev *rt_idev = rt->rt6i_idev;
165 struct net_device *rt_dev = rt->dst.dev;
166
167 if (rt_idev->dev == dev) {
168 rt->rt6i_idev = in6_dev_get(loopback_dev);
169 in6_dev_put(rt_idev);
170 }
171
172 if (rt_dev == dev) {
173 rt->dst.dev = loopback_dev;
174 dev_hold(rt->dst.dev);
175 dev_put(rt_dev);
176 }
177 }
178 spin_unlock_bh(&ul->lock);
179 }
180 }
181
182 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
183 {
184 return dst_metrics_write_ptr(rt->dst.from);
185 }
186
187 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
188 {
189 struct rt6_info *rt = (struct rt6_info *)dst;
190
191 if (rt->rt6i_flags & RTF_PCPU)
192 return rt6_pcpu_cow_metrics(rt);
193 else if (rt->rt6i_flags & RTF_CACHE)
194 return NULL;
195 else
196 return dst_cow_metrics_generic(dst, old);
197 }
198
199 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
200 struct sk_buff *skb,
201 const void *daddr)
202 {
203 struct in6_addr *p = &rt->rt6i_gateway;
204
205 if (!ipv6_addr_any(p))
206 return (const void *) p;
207 else if (skb)
208 return &ipv6_hdr(skb)->daddr;
209 return daddr;
210 }
211
212 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
213 struct sk_buff *skb,
214 const void *daddr)
215 {
216 struct rt6_info *rt = (struct rt6_info *) dst;
217 struct neighbour *n;
218
219 daddr = choose_neigh_daddr(rt, skb, daddr);
220 n = __ipv6_neigh_lookup(dst->dev, daddr);
221 if (n)
222 return n;
223 return neigh_create(&nd_tbl, daddr, dst->dev);
224 }
225
226 static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
227 {
228 struct net_device *dev = dst->dev;
229 struct rt6_info *rt = (struct rt6_info *)dst;
230
231 daddr = choose_neigh_daddr(rt, NULL, daddr);
232 if (!daddr)
233 return;
234 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
235 return;
236 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
237 return;
238 __ipv6_confirm_neigh(dev, daddr);
239 }
240
241 static struct dst_ops ip6_dst_ops_template = {
242 .family = AF_INET6,
243 .gc = ip6_dst_gc,
244 .gc_thresh = 1024,
245 .check = ip6_dst_check,
246 .default_advmss = ip6_default_advmss,
247 .mtu = ip6_mtu,
248 .cow_metrics = ipv6_cow_metrics,
249 .destroy = ip6_dst_destroy,
250 .ifdown = ip6_dst_ifdown,
251 .negative_advice = ip6_negative_advice,
252 .link_failure = ip6_link_failure,
253 .update_pmtu = ip6_rt_update_pmtu,
254 .redirect = rt6_do_redirect,
255 .local_out = __ip6_local_out,
256 .neigh_lookup = ip6_neigh_lookup,
257 .confirm_neigh = ip6_confirm_neigh,
258 };
259
260 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
261 {
262 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
263
264 return mtu ? : dst->dev->mtu;
265 }
266
267 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
268 struct sk_buff *skb, u32 mtu)
269 {
270 }
271
272 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
273 struct sk_buff *skb)
274 {
275 }
276
277 static struct dst_ops ip6_dst_blackhole_ops = {
278 .family = AF_INET6,
279 .destroy = ip6_dst_destroy,
280 .check = ip6_dst_check,
281 .mtu = ip6_blackhole_mtu,
282 .default_advmss = ip6_default_advmss,
283 .update_pmtu = ip6_rt_blackhole_update_pmtu,
284 .redirect = ip6_rt_blackhole_redirect,
285 .cow_metrics = dst_cow_metrics_generic,
286 .neigh_lookup = ip6_neigh_lookup,
287 };
288
289 static const u32 ip6_template_metrics[RTAX_MAX] = {
290 [RTAX_HOPLIMIT - 1] = 0,
291 };
292
293 static const struct rt6_info ip6_null_entry_template = {
294 .dst = {
295 .__refcnt = ATOMIC_INIT(1),
296 .__use = 1,
297 .obsolete = DST_OBSOLETE_FORCE_CHK,
298 .error = -ENETUNREACH,
299 .input = ip6_pkt_discard,
300 .output = ip6_pkt_discard_out,
301 },
302 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
303 .rt6i_protocol = RTPROT_KERNEL,
304 .rt6i_metric = ~(u32) 0,
305 .rt6i_ref = ATOMIC_INIT(1),
306 };
307
308 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
309
310 static const struct rt6_info ip6_prohibit_entry_template = {
311 .dst = {
312 .__refcnt = ATOMIC_INIT(1),
313 .__use = 1,
314 .obsolete = DST_OBSOLETE_FORCE_CHK,
315 .error = -EACCES,
316 .input = ip6_pkt_prohibit,
317 .output = ip6_pkt_prohibit_out,
318 },
319 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
320 .rt6i_protocol = RTPROT_KERNEL,
321 .rt6i_metric = ~(u32) 0,
322 .rt6i_ref = ATOMIC_INIT(1),
323 };
324
325 static const struct rt6_info ip6_blk_hole_entry_template = {
326 .dst = {
327 .__refcnt = ATOMIC_INIT(1),
328 .__use = 1,
329 .obsolete = DST_OBSOLETE_FORCE_CHK,
330 .error = -EINVAL,
331 .input = dst_discard,
332 .output = dst_discard_out,
333 },
334 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
335 .rt6i_protocol = RTPROT_KERNEL,
336 .rt6i_metric = ~(u32) 0,
337 .rt6i_ref = ATOMIC_INIT(1),
338 };
339
340 #endif
341
342 static void rt6_info_init(struct rt6_info *rt)
343 {
344 struct dst_entry *dst = &rt->dst;
345
346 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
347 INIT_LIST_HEAD(&rt->rt6i_siblings);
348 INIT_LIST_HEAD(&rt->rt6i_uncached);
349 }
350
351 /* allocate dst with ip6_dst_ops */
352 static struct rt6_info *__ip6_dst_alloc(struct net *net,
353 struct net_device *dev,
354 int flags)
355 {
356 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
357 0, DST_OBSOLETE_FORCE_CHK, flags);
358
359 if (rt)
360 rt6_info_init(rt);
361
362 return rt;
363 }
364
365 struct rt6_info *ip6_dst_alloc(struct net *net,
366 struct net_device *dev,
367 int flags)
368 {
369 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
370
371 if (rt) {
372 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
373 if (rt->rt6i_pcpu) {
374 int cpu;
375
376 for_each_possible_cpu(cpu) {
377 struct rt6_info **p;
378
379 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
380 /* no one shares rt */
381 *p = NULL;
382 }
383 } else {
384 dst_destroy((struct dst_entry *)rt);
385 return NULL;
386 }
387 }
388
389 return rt;
390 }
391 EXPORT_SYMBOL(ip6_dst_alloc);
392
393 static void ip6_dst_destroy(struct dst_entry *dst)
394 {
395 struct rt6_info *rt = (struct rt6_info *)dst;
396 struct dst_entry *from = dst->from;
397 struct inet6_dev *idev;
398
399 dst_destroy_metrics_generic(dst);
400 free_percpu(rt->rt6i_pcpu);
401 rt6_uncached_list_del(rt);
402
403 idev = rt->rt6i_idev;
404 if (idev) {
405 rt->rt6i_idev = NULL;
406 in6_dev_put(idev);
407 }
408
409 dst->from = NULL;
410 dst_release(from);
411 }
412
413 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
414 int how)
415 {
416 struct rt6_info *rt = (struct rt6_info *)dst;
417 struct inet6_dev *idev = rt->rt6i_idev;
418 struct net_device *loopback_dev =
419 dev_net(dev)->loopback_dev;
420
421 if (dev != loopback_dev) {
422 if (idev && idev->dev == dev) {
423 struct inet6_dev *loopback_idev =
424 in6_dev_get(loopback_dev);
425 if (loopback_idev) {
426 rt->rt6i_idev = loopback_idev;
427 in6_dev_put(idev);
428 }
429 }
430 }
431 }
432
433 static bool __rt6_check_expired(const struct rt6_info *rt)
434 {
435 if (rt->rt6i_flags & RTF_EXPIRES)
436 return time_after(jiffies, rt->dst.expires);
437 else
438 return false;
439 }
440
441 static bool rt6_check_expired(const struct rt6_info *rt)
442 {
443 if (rt->rt6i_flags & RTF_EXPIRES) {
444 if (time_after(jiffies, rt->dst.expires))
445 return true;
446 } else if (rt->dst.from) {
447 return rt6_check_expired((struct rt6_info *) rt->dst.from);
448 }
449 return false;
450 }
451
452 /* Multipath route selection:
453 * Hash based function using packet header and flowlabel.
454 * Adapted from fib_info_hashfn()
455 */
456 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
457 const struct flowi6 *fl6)
458 {
459 return get_hash_from_flowi6(fl6) % candidate_count;
460 }
461
462 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
463 struct flowi6 *fl6, int oif,
464 int strict)
465 {
466 struct rt6_info *sibling, *next_sibling;
467 int route_choosen;
468
469 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
470 /* Don't change the route, if route_choosen == 0
471 * (siblings does not include ourself)
472 */
473 if (route_choosen)
474 list_for_each_entry_safe(sibling, next_sibling,
475 &match->rt6i_siblings, rt6i_siblings) {
476 route_choosen--;
477 if (route_choosen == 0) {
478 if (rt6_score_route(sibling, oif, strict) < 0)
479 break;
480 match = sibling;
481 break;
482 }
483 }
484 return match;
485 }
486
487 /*
488 * Route lookup. Any table->tb6_lock is implied.
489 */
490
491 static inline struct rt6_info *rt6_device_match(struct net *net,
492 struct rt6_info *rt,
493 const struct in6_addr *saddr,
494 int oif,
495 int flags)
496 {
497 struct rt6_info *local = NULL;
498 struct rt6_info *sprt;
499
500 if (!oif && ipv6_addr_any(saddr))
501 goto out;
502
503 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
504 struct net_device *dev = sprt->dst.dev;
505
506 if (oif) {
507 if (dev->ifindex == oif)
508 return sprt;
509 if (dev->flags & IFF_LOOPBACK) {
510 if (!sprt->rt6i_idev ||
511 sprt->rt6i_idev->dev->ifindex != oif) {
512 if (flags & RT6_LOOKUP_F_IFACE)
513 continue;
514 if (local &&
515 local->rt6i_idev->dev->ifindex == oif)
516 continue;
517 }
518 local = sprt;
519 }
520 } else {
521 if (ipv6_chk_addr(net, saddr, dev,
522 flags & RT6_LOOKUP_F_IFACE))
523 return sprt;
524 }
525 }
526
527 if (oif) {
528 if (local)
529 return local;
530
531 if (flags & RT6_LOOKUP_F_IFACE)
532 return net->ipv6.ip6_null_entry;
533 }
534 out:
535 return rt;
536 }
537
538 #ifdef CONFIG_IPV6_ROUTER_PREF
539 struct __rt6_probe_work {
540 struct work_struct work;
541 struct in6_addr target;
542 struct net_device *dev;
543 };
544
545 static void rt6_probe_deferred(struct work_struct *w)
546 {
547 struct in6_addr mcaddr;
548 struct __rt6_probe_work *work =
549 container_of(w, struct __rt6_probe_work, work);
550
551 addrconf_addr_solict_mult(&work->target, &mcaddr);
552 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
553 dev_put(work->dev);
554 kfree(work);
555 }
556
557 static void rt6_probe(struct rt6_info *rt)
558 {
559 struct __rt6_probe_work *work;
560 struct neighbour *neigh;
561 /*
562 * Okay, this does not seem to be appropriate
563 * for now, however, we need to check if it
564 * is really so; aka Router Reachability Probing.
565 *
566 * Router Reachability Probe MUST be rate-limited
567 * to no more than one per minute.
568 */
569 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
570 return;
571 rcu_read_lock_bh();
572 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
573 if (neigh) {
574 if (neigh->nud_state & NUD_VALID)
575 goto out;
576
577 work = NULL;
578 write_lock(&neigh->lock);
579 if (!(neigh->nud_state & NUD_VALID) &&
580 time_after(jiffies,
581 neigh->updated +
582 rt->rt6i_idev->cnf.rtr_probe_interval)) {
583 work = kmalloc(sizeof(*work), GFP_ATOMIC);
584 if (work)
585 __neigh_set_probe_once(neigh);
586 }
587 write_unlock(&neigh->lock);
588 } else {
589 work = kmalloc(sizeof(*work), GFP_ATOMIC);
590 }
591
592 if (work) {
593 INIT_WORK(&work->work, rt6_probe_deferred);
594 work->target = rt->rt6i_gateway;
595 dev_hold(rt->dst.dev);
596 work->dev = rt->dst.dev;
597 schedule_work(&work->work);
598 }
599
600 out:
601 rcu_read_unlock_bh();
602 }
603 #else
604 static inline void rt6_probe(struct rt6_info *rt)
605 {
606 }
607 #endif
608
609 /*
610 * Default Router Selection (RFC 2461 6.3.6)
611 */
612 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
613 {
614 struct net_device *dev = rt->dst.dev;
615 if (!oif || dev->ifindex == oif)
616 return 2;
617 if ((dev->flags & IFF_LOOPBACK) &&
618 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
619 return 1;
620 return 0;
621 }
622
623 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
624 {
625 struct neighbour *neigh;
626 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
627
628 if (rt->rt6i_flags & RTF_NONEXTHOP ||
629 !(rt->rt6i_flags & RTF_GATEWAY))
630 return RT6_NUD_SUCCEED;
631
632 rcu_read_lock_bh();
633 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
634 if (neigh) {
635 read_lock(&neigh->lock);
636 if (neigh->nud_state & NUD_VALID)
637 ret = RT6_NUD_SUCCEED;
638 #ifdef CONFIG_IPV6_ROUTER_PREF
639 else if (!(neigh->nud_state & NUD_FAILED))
640 ret = RT6_NUD_SUCCEED;
641 else
642 ret = RT6_NUD_FAIL_PROBE;
643 #endif
644 read_unlock(&neigh->lock);
645 } else {
646 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
647 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
648 }
649 rcu_read_unlock_bh();
650
651 return ret;
652 }
653
654 static int rt6_score_route(struct rt6_info *rt, int oif,
655 int strict)
656 {
657 int m;
658
659 m = rt6_check_dev(rt, oif);
660 if (!m && (strict & RT6_LOOKUP_F_IFACE))
661 return RT6_NUD_FAIL_HARD;
662 #ifdef CONFIG_IPV6_ROUTER_PREF
663 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
664 #endif
665 if (strict & RT6_LOOKUP_F_REACHABLE) {
666 int n = rt6_check_neigh(rt);
667 if (n < 0)
668 return n;
669 }
670 return m;
671 }
672
673 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
674 int *mpri, struct rt6_info *match,
675 bool *do_rr)
676 {
677 int m;
678 bool match_do_rr = false;
679 struct inet6_dev *idev = rt->rt6i_idev;
680 struct net_device *dev = rt->dst.dev;
681
682 if (dev && !netif_carrier_ok(dev) &&
683 idev->cnf.ignore_routes_with_linkdown &&
684 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
685 goto out;
686
687 if (rt6_check_expired(rt))
688 goto out;
689
690 m = rt6_score_route(rt, oif, strict);
691 if (m == RT6_NUD_FAIL_DO_RR) {
692 match_do_rr = true;
693 m = 0; /* lowest valid score */
694 } else if (m == RT6_NUD_FAIL_HARD) {
695 goto out;
696 }
697
698 if (strict & RT6_LOOKUP_F_REACHABLE)
699 rt6_probe(rt);
700
701 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
702 if (m > *mpri) {
703 *do_rr = match_do_rr;
704 *mpri = m;
705 match = rt;
706 }
707 out:
708 return match;
709 }
710
711 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
712 struct rt6_info *rr_head,
713 u32 metric, int oif, int strict,
714 bool *do_rr)
715 {
716 struct rt6_info *rt, *match, *cont;
717 int mpri = -1;
718
719 match = NULL;
720 cont = NULL;
721 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
722 if (rt->rt6i_metric != metric) {
723 cont = rt;
724 break;
725 }
726
727 match = find_match(rt, oif, strict, &mpri, match, do_rr);
728 }
729
730 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
731 if (rt->rt6i_metric != metric) {
732 cont = rt;
733 break;
734 }
735
736 match = find_match(rt, oif, strict, &mpri, match, do_rr);
737 }
738
739 if (match || !cont)
740 return match;
741
742 for (rt = cont; rt; rt = rt->dst.rt6_next)
743 match = find_match(rt, oif, strict, &mpri, match, do_rr);
744
745 return match;
746 }
747
748 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
749 {
750 struct rt6_info *match, *rt0;
751 struct net *net;
752 bool do_rr = false;
753
754 rt0 = fn->rr_ptr;
755 if (!rt0)
756 fn->rr_ptr = rt0 = fn->leaf;
757
758 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
759 &do_rr);
760
761 if (do_rr) {
762 struct rt6_info *next = rt0->dst.rt6_next;
763
764 /* no entries matched; do round-robin */
765 if (!next || next->rt6i_metric != rt0->rt6i_metric)
766 next = fn->leaf;
767
768 if (next != rt0)
769 fn->rr_ptr = next;
770 }
771
772 net = dev_net(rt0->dst.dev);
773 return match ? match : net->ipv6.ip6_null_entry;
774 }
775
776 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
777 {
778 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
779 }
780
781 #ifdef CONFIG_IPV6_ROUTE_INFO
782 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
783 const struct in6_addr *gwaddr)
784 {
785 struct net *net = dev_net(dev);
786 struct route_info *rinfo = (struct route_info *) opt;
787 struct in6_addr prefix_buf, *prefix;
788 unsigned int pref;
789 unsigned long lifetime;
790 struct rt6_info *rt;
791
792 if (len < sizeof(struct route_info)) {
793 return -EINVAL;
794 }
795
796 /* Sanity check for prefix_len and length */
797 if (rinfo->length > 3) {
798 return -EINVAL;
799 } else if (rinfo->prefix_len > 128) {
800 return -EINVAL;
801 } else if (rinfo->prefix_len > 64) {
802 if (rinfo->length < 2) {
803 return -EINVAL;
804 }
805 } else if (rinfo->prefix_len > 0) {
806 if (rinfo->length < 1) {
807 return -EINVAL;
808 }
809 }
810
811 pref = rinfo->route_pref;
812 if (pref == ICMPV6_ROUTER_PREF_INVALID)
813 return -EINVAL;
814
815 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
816
817 if (rinfo->length == 3)
818 prefix = (struct in6_addr *)rinfo->prefix;
819 else {
820 /* this function is safe */
821 ipv6_addr_prefix(&prefix_buf,
822 (struct in6_addr *)rinfo->prefix,
823 rinfo->prefix_len);
824 prefix = &prefix_buf;
825 }
826
827 if (rinfo->prefix_len == 0)
828 rt = rt6_get_dflt_router(gwaddr, dev);
829 else
830 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
831 gwaddr, dev);
832
833 if (rt && !lifetime) {
834 ip6_del_rt(rt);
835 rt = NULL;
836 }
837
838 if (!rt && lifetime)
839 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
840 dev, pref);
841 else if (rt)
842 rt->rt6i_flags = RTF_ROUTEINFO |
843 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
844
845 if (rt) {
846 if (!addrconf_finite_timeout(lifetime))
847 rt6_clean_expires(rt);
848 else
849 rt6_set_expires(rt, jiffies + HZ * lifetime);
850
851 ip6_rt_put(rt);
852 }
853 return 0;
854 }
855 #endif
856
857 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
858 struct in6_addr *saddr)
859 {
860 struct fib6_node *pn;
861 while (1) {
862 if (fn->fn_flags & RTN_TL_ROOT)
863 return NULL;
864 pn = fn->parent;
865 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
866 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
867 else
868 fn = pn;
869 if (fn->fn_flags & RTN_RTINFO)
870 return fn;
871 }
872 }
873
874 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
875 struct fib6_table *table,
876 struct flowi6 *fl6, int flags)
877 {
878 struct fib6_node *fn;
879 struct rt6_info *rt;
880
881 read_lock_bh(&table->tb6_lock);
882 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
883 restart:
884 rt = fn->leaf;
885 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
886 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
887 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
888 if (rt == net->ipv6.ip6_null_entry) {
889 fn = fib6_backtrack(fn, &fl6->saddr);
890 if (fn)
891 goto restart;
892 }
893 dst_use(&rt->dst, jiffies);
894 read_unlock_bh(&table->tb6_lock);
895
896 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
897
898 return rt;
899
900 }
901
902 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
903 int flags)
904 {
905 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
906 }
907 EXPORT_SYMBOL_GPL(ip6_route_lookup);
908
909 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
910 const struct in6_addr *saddr, int oif, int strict)
911 {
912 struct flowi6 fl6 = {
913 .flowi6_oif = oif,
914 .daddr = *daddr,
915 };
916 struct dst_entry *dst;
917 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
918
919 if (saddr) {
920 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
921 flags |= RT6_LOOKUP_F_HAS_SADDR;
922 }
923
924 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
925 if (dst->error == 0)
926 return (struct rt6_info *) dst;
927
928 dst_release(dst);
929
930 return NULL;
931 }
932 EXPORT_SYMBOL(rt6_lookup);
933
934 /* ip6_ins_rt is called with FREE table->tb6_lock.
935 It takes new route entry, the addition fails by any reason the
936 route is freed. In any case, if caller does not hold it, it may
937 be destroyed.
938 */
939
940 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
941 struct mx6_config *mxc)
942 {
943 int err;
944 struct fib6_table *table;
945
946 table = rt->rt6i_table;
947 write_lock_bh(&table->tb6_lock);
948 err = fib6_add(&table->tb6_root, rt, info, mxc);
949 write_unlock_bh(&table->tb6_lock);
950
951 return err;
952 }
953
954 int ip6_ins_rt(struct rt6_info *rt)
955 {
956 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
957 struct mx6_config mxc = { .mx = NULL, };
958
959 return __ip6_ins_rt(rt, &info, &mxc);
960 }
961
962 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
963 const struct in6_addr *daddr,
964 const struct in6_addr *saddr)
965 {
966 struct rt6_info *rt;
967
968 /*
969 * Clone the route.
970 */
971
972 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
973 ort = (struct rt6_info *)ort->dst.from;
974
975 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
976
977 if (!rt)
978 return NULL;
979
980 ip6_rt_copy_init(rt, ort);
981 rt->rt6i_flags |= RTF_CACHE;
982 rt->rt6i_metric = 0;
983 rt->dst.flags |= DST_HOST;
984 rt->rt6i_dst.addr = *daddr;
985 rt->rt6i_dst.plen = 128;
986
987 if (!rt6_is_gw_or_nonexthop(ort)) {
988 if (ort->rt6i_dst.plen != 128 &&
989 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
990 rt->rt6i_flags |= RTF_ANYCAST;
991 #ifdef CONFIG_IPV6_SUBTREES
992 if (rt->rt6i_src.plen && saddr) {
993 rt->rt6i_src.addr = *saddr;
994 rt->rt6i_src.plen = 128;
995 }
996 #endif
997 }
998
999 return rt;
1000 }
1001
1002 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
1003 {
1004 struct rt6_info *pcpu_rt;
1005
1006 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
1007 rt->dst.dev, rt->dst.flags);
1008
1009 if (!pcpu_rt)
1010 return NULL;
1011 ip6_rt_copy_init(pcpu_rt, rt);
1012 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
1013 pcpu_rt->rt6i_flags |= RTF_PCPU;
1014 return pcpu_rt;
1015 }
1016
1017 /* It should be called with read_lock_bh(&tb6_lock) acquired */
1018 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
1019 {
1020 struct rt6_info *pcpu_rt, **p;
1021
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 pcpu_rt = *p;
1024
1025 if (pcpu_rt) {
1026 dst_hold(&pcpu_rt->dst);
1027 rt6_dst_from_metrics_check(pcpu_rt);
1028 }
1029 return pcpu_rt;
1030 }
1031
1032 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1033 {
1034 struct fib6_table *table = rt->rt6i_table;
1035 struct rt6_info *pcpu_rt, *prev, **p;
1036
1037 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1038 if (!pcpu_rt) {
1039 struct net *net = dev_net(rt->dst.dev);
1040
1041 dst_hold(&net->ipv6.ip6_null_entry->dst);
1042 return net->ipv6.ip6_null_entry;
1043 }
1044
1045 read_lock_bh(&table->tb6_lock);
1046 if (rt->rt6i_pcpu) {
1047 p = this_cpu_ptr(rt->rt6i_pcpu);
1048 prev = cmpxchg(p, NULL, pcpu_rt);
1049 if (prev) {
1050 /* If someone did it before us, return prev instead */
1051 dst_destroy(&pcpu_rt->dst);
1052 pcpu_rt = prev;
1053 }
1054 } else {
1055 /* rt has been removed from the fib6 tree
1056 * before we have a chance to acquire the read_lock.
1057 * In this case, don't brother to create a pcpu rt
1058 * since rt is going away anyway. The next
1059 * dst_check() will trigger a re-lookup.
1060 */
1061 dst_destroy(&pcpu_rt->dst);
1062 pcpu_rt = rt;
1063 }
1064 dst_hold(&pcpu_rt->dst);
1065 rt6_dst_from_metrics_check(pcpu_rt);
1066 read_unlock_bh(&table->tb6_lock);
1067 return pcpu_rt;
1068 }
1069
1070 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1071 int oif, struct flowi6 *fl6, int flags)
1072 {
1073 struct fib6_node *fn, *saved_fn;
1074 struct rt6_info *rt;
1075 int strict = 0;
1076
1077 strict |= flags & RT6_LOOKUP_F_IFACE;
1078 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
1079 if (net->ipv6.devconf_all->forwarding == 0)
1080 strict |= RT6_LOOKUP_F_REACHABLE;
1081
1082 read_lock_bh(&table->tb6_lock);
1083
1084 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1085 saved_fn = fn;
1086
1087 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1088 oif = 0;
1089
1090 redo_rt6_select:
1091 rt = rt6_select(fn, oif, strict);
1092 if (rt->rt6i_nsiblings)
1093 rt = rt6_multipath_select(rt, fl6, oif, strict);
1094 if (rt == net->ipv6.ip6_null_entry) {
1095 fn = fib6_backtrack(fn, &fl6->saddr);
1096 if (fn)
1097 goto redo_rt6_select;
1098 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1099 /* also consider unreachable route */
1100 strict &= ~RT6_LOOKUP_F_REACHABLE;
1101 fn = saved_fn;
1102 goto redo_rt6_select;
1103 }
1104 }
1105
1106
1107 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1108 dst_use(&rt->dst, jiffies);
1109 read_unlock_bh(&table->tb6_lock);
1110
1111 rt6_dst_from_metrics_check(rt);
1112
1113 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1114 return rt;
1115 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1116 !(rt->rt6i_flags & RTF_GATEWAY))) {
1117 /* Create a RTF_CACHE clone which will not be
1118 * owned by the fib6 tree. It is for the special case where
1119 * the daddr in the skb during the neighbor look-up is different
1120 * from the fl6->daddr used to look-up route here.
1121 */
1122
1123 struct rt6_info *uncached_rt;
1124
1125 dst_use(&rt->dst, jiffies);
1126 read_unlock_bh(&table->tb6_lock);
1127
1128 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1129 dst_release(&rt->dst);
1130
1131 if (uncached_rt)
1132 rt6_uncached_list_add(uncached_rt);
1133 else
1134 uncached_rt = net->ipv6.ip6_null_entry;
1135
1136 dst_hold(&uncached_rt->dst);
1137
1138 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
1139 return uncached_rt;
1140
1141 } else {
1142 /* Get a percpu copy */
1143
1144 struct rt6_info *pcpu_rt;
1145
1146 rt->dst.lastuse = jiffies;
1147 rt->dst.__use++;
1148 pcpu_rt = rt6_get_pcpu_route(rt);
1149
1150 if (pcpu_rt) {
1151 read_unlock_bh(&table->tb6_lock);
1152 } else {
1153 /* We have to do the read_unlock first
1154 * because rt6_make_pcpu_route() may trigger
1155 * ip6_dst_gc() which will take the write_lock.
1156 */
1157 dst_hold(&rt->dst);
1158 read_unlock_bh(&table->tb6_lock);
1159 pcpu_rt = rt6_make_pcpu_route(rt);
1160 dst_release(&rt->dst);
1161 }
1162
1163 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
1164 return pcpu_rt;
1165
1166 }
1167 }
1168 EXPORT_SYMBOL_GPL(ip6_pol_route);
1169
1170 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1171 struct flowi6 *fl6, int flags)
1172 {
1173 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1174 }
1175
1176 struct dst_entry *ip6_route_input_lookup(struct net *net,
1177 struct net_device *dev,
1178 struct flowi6 *fl6, int flags)
1179 {
1180 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1181 flags |= RT6_LOOKUP_F_IFACE;
1182
1183 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1184 }
1185 EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
1186
1187 void ip6_route_input(struct sk_buff *skb)
1188 {
1189 const struct ipv6hdr *iph = ipv6_hdr(skb);
1190 struct net *net = dev_net(skb->dev);
1191 int flags = RT6_LOOKUP_F_HAS_SADDR;
1192 struct ip_tunnel_info *tun_info;
1193 struct flowi6 fl6 = {
1194 .flowi6_iif = skb->dev->ifindex,
1195 .daddr = iph->daddr,
1196 .saddr = iph->saddr,
1197 .flowlabel = ip6_flowinfo(iph),
1198 .flowi6_mark = skb->mark,
1199 .flowi6_proto = iph->nexthdr,
1200 };
1201
1202 tun_info = skb_tunnel_info(skb);
1203 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1204 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1205 skb_dst_drop(skb);
1206 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1207 }
1208
1209 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1210 struct flowi6 *fl6, int flags)
1211 {
1212 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1213 }
1214
1215 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1216 struct flowi6 *fl6, int flags)
1217 {
1218 bool any_src;
1219
1220 if (rt6_need_strict(&fl6->daddr)) {
1221 struct dst_entry *dst;
1222
1223 dst = l3mdev_link_scope_lookup(net, fl6);
1224 if (dst)
1225 return dst;
1226 }
1227
1228 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1229
1230 any_src = ipv6_addr_any(&fl6->saddr);
1231 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1232 (fl6->flowi6_oif && any_src))
1233 flags |= RT6_LOOKUP_F_IFACE;
1234
1235 if (!any_src)
1236 flags |= RT6_LOOKUP_F_HAS_SADDR;
1237 else if (sk)
1238 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1239
1240 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1241 }
1242 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1243
1244 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1245 {
1246 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1247 struct dst_entry *new = NULL;
1248
1249 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1250 if (rt) {
1251 rt6_info_init(rt);
1252
1253 new = &rt->dst;
1254 new->__use = 1;
1255 new->input = dst_discard;
1256 new->output = dst_discard_out;
1257
1258 dst_copy_metrics(new, &ort->dst);
1259 rt->rt6i_idev = ort->rt6i_idev;
1260 if (rt->rt6i_idev)
1261 in6_dev_hold(rt->rt6i_idev);
1262
1263 rt->rt6i_gateway = ort->rt6i_gateway;
1264 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1265 rt->rt6i_metric = 0;
1266
1267 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1268 #ifdef CONFIG_IPV6_SUBTREES
1269 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1270 #endif
1271
1272 dst_free(new);
1273 }
1274
1275 dst_release(dst_orig);
1276 return new ? new : ERR_PTR(-ENOMEM);
1277 }
1278
1279 /*
1280 * Destination cache support functions
1281 */
1282
1283 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1284 {
1285 if (rt->dst.from &&
1286 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1287 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1288 }
1289
1290 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1291 {
1292 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1293 return NULL;
1294
1295 if (rt6_check_expired(rt))
1296 return NULL;
1297
1298 return &rt->dst;
1299 }
1300
1301 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1302 {
1303 if (!__rt6_check_expired(rt) &&
1304 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1305 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1306 return &rt->dst;
1307 else
1308 return NULL;
1309 }
1310
1311 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1312 {
1313 struct rt6_info *rt;
1314
1315 rt = (struct rt6_info *) dst;
1316
1317 /* All IPV6 dsts are created with ->obsolete set to the value
1318 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1319 * into this function always.
1320 */
1321
1322 rt6_dst_from_metrics_check(rt);
1323
1324 if (rt->rt6i_flags & RTF_PCPU ||
1325 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1326 return rt6_dst_from_check(rt, cookie);
1327 else
1328 return rt6_check(rt, cookie);
1329 }
1330
1331 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1332 {
1333 struct rt6_info *rt = (struct rt6_info *) dst;
1334
1335 if (rt) {
1336 if (rt->rt6i_flags & RTF_CACHE) {
1337 if (rt6_check_expired(rt)) {
1338 ip6_del_rt(rt);
1339 dst = NULL;
1340 }
1341 } else {
1342 dst_release(dst);
1343 dst = NULL;
1344 }
1345 }
1346 return dst;
1347 }
1348
1349 static void ip6_link_failure(struct sk_buff *skb)
1350 {
1351 struct rt6_info *rt;
1352
1353 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1354
1355 rt = (struct rt6_info *) skb_dst(skb);
1356 if (rt) {
1357 if (rt->rt6i_flags & RTF_CACHE) {
1358 dst_hold(&rt->dst);
1359 ip6_del_rt(rt);
1360 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1361 rt->rt6i_node->fn_sernum = -1;
1362 }
1363 }
1364 }
1365
1366 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1367 {
1368 struct net *net = dev_net(rt->dst.dev);
1369
1370 rt->rt6i_flags |= RTF_MODIFIED;
1371 rt->rt6i_pmtu = mtu;
1372 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1373 }
1374
1375 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1376 {
1377 return !(rt->rt6i_flags & RTF_CACHE) &&
1378 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1379 }
1380
1381 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1382 const struct ipv6hdr *iph, u32 mtu)
1383 {
1384 const struct in6_addr *daddr, *saddr;
1385 struct rt6_info *rt6 = (struct rt6_info *)dst;
1386
1387 if (rt6->rt6i_flags & RTF_LOCAL)
1388 return;
1389
1390 if (dst_metric_locked(dst, RTAX_MTU))
1391 return;
1392
1393 if (iph) {
1394 daddr = &iph->daddr;
1395 saddr = &iph->saddr;
1396 } else if (sk) {
1397 daddr = &sk->sk_v6_daddr;
1398 saddr = &inet6_sk(sk)->saddr;
1399 } else {
1400 daddr = NULL;
1401 saddr = NULL;
1402 }
1403 dst_confirm_neigh(dst, daddr);
1404 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1405 if (mtu >= dst_mtu(dst))
1406 return;
1407
1408 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1409 rt6_do_update_pmtu(rt6, mtu);
1410 } else if (daddr) {
1411 struct rt6_info *nrt6;
1412
1413 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1414 if (nrt6) {
1415 rt6_do_update_pmtu(nrt6, mtu);
1416
1417 /* ip6_ins_rt(nrt6) will bump the
1418 * rt6->rt6i_node->fn_sernum
1419 * which will fail the next rt6_check() and
1420 * invalidate the sk->sk_dst_cache.
1421 */
1422 ip6_ins_rt(nrt6);
1423 }
1424 }
1425 }
1426
1427 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1428 struct sk_buff *skb, u32 mtu)
1429 {
1430 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1431 }
1432
1433 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1434 int oif, u32 mark, kuid_t uid)
1435 {
1436 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1437 struct dst_entry *dst;
1438 struct flowi6 fl6;
1439
1440 memset(&fl6, 0, sizeof(fl6));
1441 fl6.flowi6_oif = oif;
1442 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1443 fl6.daddr = iph->daddr;
1444 fl6.saddr = iph->saddr;
1445 fl6.flowlabel = ip6_flowinfo(iph);
1446 fl6.flowi6_uid = uid;
1447
1448 dst = ip6_route_output(net, NULL, &fl6);
1449 if (!dst->error)
1450 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1451 dst_release(dst);
1452 }
1453 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1454
1455 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1456 {
1457 struct dst_entry *dst;
1458
1459 ip6_update_pmtu(skb, sock_net(sk), mtu,
1460 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
1461
1462 dst = __sk_dst_get(sk);
1463 if (!dst || !dst->obsolete ||
1464 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1465 return;
1466
1467 bh_lock_sock(sk);
1468 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1469 ip6_datagram_dst_update(sk, false);
1470 bh_unlock_sock(sk);
1471 }
1472 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1473
1474 /* Handle redirects */
1475 struct ip6rd_flowi {
1476 struct flowi6 fl6;
1477 struct in6_addr gateway;
1478 };
1479
1480 static struct rt6_info *__ip6_route_redirect(struct net *net,
1481 struct fib6_table *table,
1482 struct flowi6 *fl6,
1483 int flags)
1484 {
1485 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1486 struct rt6_info *rt;
1487 struct fib6_node *fn;
1488
1489 /* Get the "current" route for this destination and
1490 * check if the redirect has come from appropriate router.
1491 *
1492 * RFC 4861 specifies that redirects should only be
1493 * accepted if they come from the nexthop to the target.
1494 * Due to the way the routes are chosen, this notion
1495 * is a bit fuzzy and one might need to check all possible
1496 * routes.
1497 */
1498
1499 read_lock_bh(&table->tb6_lock);
1500 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1501 restart:
1502 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1503 if (rt6_check_expired(rt))
1504 continue;
1505 if (rt->dst.error)
1506 break;
1507 if (!(rt->rt6i_flags & RTF_GATEWAY))
1508 continue;
1509 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1510 continue;
1511 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1512 continue;
1513 break;
1514 }
1515
1516 if (!rt)
1517 rt = net->ipv6.ip6_null_entry;
1518 else if (rt->dst.error) {
1519 rt = net->ipv6.ip6_null_entry;
1520 goto out;
1521 }
1522
1523 if (rt == net->ipv6.ip6_null_entry) {
1524 fn = fib6_backtrack(fn, &fl6->saddr);
1525 if (fn)
1526 goto restart;
1527 }
1528
1529 out:
1530 dst_hold(&rt->dst);
1531
1532 read_unlock_bh(&table->tb6_lock);
1533
1534 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1535 return rt;
1536 };
1537
1538 static struct dst_entry *ip6_route_redirect(struct net *net,
1539 const struct flowi6 *fl6,
1540 const struct in6_addr *gateway)
1541 {
1542 int flags = RT6_LOOKUP_F_HAS_SADDR;
1543 struct ip6rd_flowi rdfl;
1544
1545 rdfl.fl6 = *fl6;
1546 rdfl.gateway = *gateway;
1547
1548 return fib6_rule_lookup(net, &rdfl.fl6,
1549 flags, __ip6_route_redirect);
1550 }
1551
1552 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
1553 kuid_t uid)
1554 {
1555 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1556 struct dst_entry *dst;
1557 struct flowi6 fl6;
1558
1559 memset(&fl6, 0, sizeof(fl6));
1560 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1561 fl6.flowi6_oif = oif;
1562 fl6.flowi6_mark = mark;
1563 fl6.daddr = iph->daddr;
1564 fl6.saddr = iph->saddr;
1565 fl6.flowlabel = ip6_flowinfo(iph);
1566 fl6.flowi6_uid = uid;
1567
1568 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1569 rt6_do_redirect(dst, NULL, skb);
1570 dst_release(dst);
1571 }
1572 EXPORT_SYMBOL_GPL(ip6_redirect);
1573
1574 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1575 u32 mark)
1576 {
1577 const struct ipv6hdr *iph = ipv6_hdr(skb);
1578 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1579 struct dst_entry *dst;
1580 struct flowi6 fl6;
1581
1582 memset(&fl6, 0, sizeof(fl6));
1583 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1584 fl6.flowi6_oif = oif;
1585 fl6.flowi6_mark = mark;
1586 fl6.daddr = msg->dest;
1587 fl6.saddr = iph->daddr;
1588 fl6.flowi6_uid = sock_net_uid(net, NULL);
1589
1590 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1591 rt6_do_redirect(dst, NULL, skb);
1592 dst_release(dst);
1593 }
1594
1595 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1596 {
1597 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
1598 sk->sk_uid);
1599 }
1600 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1601
1602 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1603 {
1604 struct net_device *dev = dst->dev;
1605 unsigned int mtu = dst_mtu(dst);
1606 struct net *net = dev_net(dev);
1607
1608 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1609
1610 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1611 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1612
1613 /*
1614 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1615 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1616 * IPV6_MAXPLEN is also valid and means: "any MSS,
1617 * rely only on pmtu discovery"
1618 */
1619 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1620 mtu = IPV6_MAXPLEN;
1621 return mtu;
1622 }
1623
1624 static unsigned int ip6_mtu(const struct dst_entry *dst)
1625 {
1626 const struct rt6_info *rt = (const struct rt6_info *)dst;
1627 unsigned int mtu = rt->rt6i_pmtu;
1628 struct inet6_dev *idev;
1629
1630 if (mtu)
1631 goto out;
1632
1633 mtu = dst_metric_raw(dst, RTAX_MTU);
1634 if (mtu)
1635 goto out;
1636
1637 mtu = IPV6_MIN_MTU;
1638
1639 rcu_read_lock();
1640 idev = __in6_dev_get(dst->dev);
1641 if (idev)
1642 mtu = idev->cnf.mtu6;
1643 rcu_read_unlock();
1644
1645 out:
1646 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1647
1648 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
1649 }
1650
1651 static struct dst_entry *icmp6_dst_gc_list;
1652 static DEFINE_SPINLOCK(icmp6_dst_lock);
1653
1654 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1655 struct flowi6 *fl6)
1656 {
1657 struct dst_entry *dst;
1658 struct rt6_info *rt;
1659 struct inet6_dev *idev = in6_dev_get(dev);
1660 struct net *net = dev_net(dev);
1661
1662 if (unlikely(!idev))
1663 return ERR_PTR(-ENODEV);
1664
1665 rt = ip6_dst_alloc(net, dev, 0);
1666 if (unlikely(!rt)) {
1667 in6_dev_put(idev);
1668 dst = ERR_PTR(-ENOMEM);
1669 goto out;
1670 }
1671
1672 rt->dst.flags |= DST_HOST;
1673 rt->dst.output = ip6_output;
1674 atomic_set(&rt->dst.__refcnt, 1);
1675 rt->rt6i_gateway = fl6->daddr;
1676 rt->rt6i_dst.addr = fl6->daddr;
1677 rt->rt6i_dst.plen = 128;
1678 rt->rt6i_idev = idev;
1679 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1680
1681 spin_lock_bh(&icmp6_dst_lock);
1682 rt->dst.next = icmp6_dst_gc_list;
1683 icmp6_dst_gc_list = &rt->dst;
1684 spin_unlock_bh(&icmp6_dst_lock);
1685
1686 fib6_force_start_gc(net);
1687
1688 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1689
1690 out:
1691 return dst;
1692 }
1693
1694 int icmp6_dst_gc(void)
1695 {
1696 struct dst_entry *dst, **pprev;
1697 int more = 0;
1698
1699 spin_lock_bh(&icmp6_dst_lock);
1700 pprev = &icmp6_dst_gc_list;
1701
1702 while ((dst = *pprev) != NULL) {
1703 if (!atomic_read(&dst->__refcnt)) {
1704 *pprev = dst->next;
1705 dst_free(dst);
1706 } else {
1707 pprev = &dst->next;
1708 ++more;
1709 }
1710 }
1711
1712 spin_unlock_bh(&icmp6_dst_lock);
1713
1714 return more;
1715 }
1716
1717 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1718 void *arg)
1719 {
1720 struct dst_entry *dst, **pprev;
1721
1722 spin_lock_bh(&icmp6_dst_lock);
1723 pprev = &icmp6_dst_gc_list;
1724 while ((dst = *pprev) != NULL) {
1725 struct rt6_info *rt = (struct rt6_info *) dst;
1726 if (func(rt, arg)) {
1727 *pprev = dst->next;
1728 dst_free(dst);
1729 } else {
1730 pprev = &dst->next;
1731 }
1732 }
1733 spin_unlock_bh(&icmp6_dst_lock);
1734 }
1735
1736 static int ip6_dst_gc(struct dst_ops *ops)
1737 {
1738 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1739 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1740 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1741 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1742 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1743 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1744 int entries;
1745
1746 entries = dst_entries_get_fast(ops);
1747 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1748 entries <= rt_max_size)
1749 goto out;
1750
1751 net->ipv6.ip6_rt_gc_expire++;
1752 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1753 entries = dst_entries_get_slow(ops);
1754 if (entries < ops->gc_thresh)
1755 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1756 out:
1757 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1758 return entries > rt_max_size;
1759 }
1760
1761 static int ip6_convert_metrics(struct mx6_config *mxc,
1762 const struct fib6_config *cfg)
1763 {
1764 bool ecn_ca = false;
1765 struct nlattr *nla;
1766 int remaining;
1767 u32 *mp;
1768
1769 if (!cfg->fc_mx)
1770 return 0;
1771
1772 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1773 if (unlikely(!mp))
1774 return -ENOMEM;
1775
1776 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1777 int type = nla_type(nla);
1778 u32 val;
1779
1780 if (!type)
1781 continue;
1782 if (unlikely(type > RTAX_MAX))
1783 goto err;
1784
1785 if (type == RTAX_CC_ALGO) {
1786 char tmp[TCP_CA_NAME_MAX];
1787
1788 nla_strlcpy(tmp, nla, sizeof(tmp));
1789 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1790 if (val == TCP_CA_UNSPEC)
1791 goto err;
1792 } else {
1793 val = nla_get_u32(nla);
1794 }
1795 if (type == RTAX_HOPLIMIT && val > 255)
1796 val = 255;
1797 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1798 goto err;
1799
1800 mp[type - 1] = val;
1801 __set_bit(type - 1, mxc->mx_valid);
1802 }
1803
1804 if (ecn_ca) {
1805 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1806 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1807 }
1808
1809 mxc->mx = mp;
1810 return 0;
1811 err:
1812 kfree(mp);
1813 return -EINVAL;
1814 }
1815
1816 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1817 struct fib6_config *cfg,
1818 const struct in6_addr *gw_addr)
1819 {
1820 struct flowi6 fl6 = {
1821 .flowi6_oif = cfg->fc_ifindex,
1822 .daddr = *gw_addr,
1823 .saddr = cfg->fc_prefsrc,
1824 };
1825 struct fib6_table *table;
1826 struct rt6_info *rt;
1827 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;
1828
1829 table = fib6_get_table(net, cfg->fc_table);
1830 if (!table)
1831 return NULL;
1832
1833 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1834 flags |= RT6_LOOKUP_F_HAS_SADDR;
1835
1836 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1837
1838 /* if table lookup failed, fall back to full lookup */
1839 if (rt == net->ipv6.ip6_null_entry) {
1840 ip6_rt_put(rt);
1841 rt = NULL;
1842 }
1843
1844 return rt;
1845 }
1846
1847 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1848 {
1849 struct net *net = cfg->fc_nlinfo.nl_net;
1850 struct rt6_info *rt = NULL;
1851 struct net_device *dev = NULL;
1852 struct inet6_dev *idev = NULL;
1853 struct fib6_table *table;
1854 int addr_type;
1855 int err = -EINVAL;
1856
1857 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1858 goto out;
1859 #ifndef CONFIG_IPV6_SUBTREES
1860 if (cfg->fc_src_len)
1861 goto out;
1862 #endif
1863 if (cfg->fc_ifindex) {
1864 err = -ENODEV;
1865 dev = dev_get_by_index(net, cfg->fc_ifindex);
1866 if (!dev)
1867 goto out;
1868 idev = in6_dev_get(dev);
1869 if (!idev)
1870 goto out;
1871 }
1872
1873 if (cfg->fc_metric == 0)
1874 cfg->fc_metric = IP6_RT_PRIO_USER;
1875
1876 err = -ENOBUFS;
1877 if (cfg->fc_nlinfo.nlh &&
1878 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1879 table = fib6_get_table(net, cfg->fc_table);
1880 if (!table) {
1881 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1882 table = fib6_new_table(net, cfg->fc_table);
1883 }
1884 } else {
1885 table = fib6_new_table(net, cfg->fc_table);
1886 }
1887
1888 if (!table)
1889 goto out;
1890
1891 rt = ip6_dst_alloc(net, NULL,
1892 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1893
1894 if (!rt) {
1895 err = -ENOMEM;
1896 goto out;
1897 }
1898
1899 if (cfg->fc_flags & RTF_EXPIRES)
1900 rt6_set_expires(rt, jiffies +
1901 clock_t_to_jiffies(cfg->fc_expires));
1902 else
1903 rt6_clean_expires(rt);
1904
1905 if (cfg->fc_protocol == RTPROT_UNSPEC)
1906 cfg->fc_protocol = RTPROT_BOOT;
1907 rt->rt6i_protocol = cfg->fc_protocol;
1908
1909 addr_type = ipv6_addr_type(&cfg->fc_dst);
1910
1911 if (addr_type & IPV6_ADDR_MULTICAST)
1912 rt->dst.input = ip6_mc_input;
1913 else if (cfg->fc_flags & RTF_LOCAL)
1914 rt->dst.input = ip6_input;
1915 else
1916 rt->dst.input = ip6_forward;
1917
1918 rt->dst.output = ip6_output;
1919
1920 if (cfg->fc_encap) {
1921 struct lwtunnel_state *lwtstate;
1922
1923 err = lwtunnel_build_state(cfg->fc_encap_type,
1924 cfg->fc_encap, AF_INET6, cfg,
1925 &lwtstate);
1926 if (err)
1927 goto out;
1928 rt->dst.lwtstate = lwtstate_get(lwtstate);
1929 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1930 rt->dst.lwtstate->orig_output = rt->dst.output;
1931 rt->dst.output = lwtunnel_output;
1932 }
1933 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1934 rt->dst.lwtstate->orig_input = rt->dst.input;
1935 rt->dst.input = lwtunnel_input;
1936 }
1937 }
1938
1939 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1940 rt->rt6i_dst.plen = cfg->fc_dst_len;
1941 if (rt->rt6i_dst.plen == 128)
1942 rt->dst.flags |= DST_HOST;
1943
1944 #ifdef CONFIG_IPV6_SUBTREES
1945 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1946 rt->rt6i_src.plen = cfg->fc_src_len;
1947 #endif
1948
1949 rt->rt6i_metric = cfg->fc_metric;
1950
1951 /* We cannot add true routes via loopback here,
1952 they would result in kernel looping; promote them to reject routes
1953 */
1954 if ((cfg->fc_flags & RTF_REJECT) ||
1955 (dev && (dev->flags & IFF_LOOPBACK) &&
1956 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1957 !(cfg->fc_flags & RTF_LOCAL))) {
1958 /* hold loopback dev/idev if we haven't done so. */
1959 if (dev != net->loopback_dev) {
1960 if (dev) {
1961 dev_put(dev);
1962 in6_dev_put(idev);
1963 }
1964 dev = net->loopback_dev;
1965 dev_hold(dev);
1966 idev = in6_dev_get(dev);
1967 if (!idev) {
1968 err = -ENODEV;
1969 goto out;
1970 }
1971 }
1972 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1973 switch (cfg->fc_type) {
1974 case RTN_BLACKHOLE:
1975 rt->dst.error = -EINVAL;
1976 rt->dst.output = dst_discard_out;
1977 rt->dst.input = dst_discard;
1978 break;
1979 case RTN_PROHIBIT:
1980 rt->dst.error = -EACCES;
1981 rt->dst.output = ip6_pkt_prohibit_out;
1982 rt->dst.input = ip6_pkt_prohibit;
1983 break;
1984 case RTN_THROW:
1985 case RTN_UNREACHABLE:
1986 default:
1987 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1988 : (cfg->fc_type == RTN_UNREACHABLE)
1989 ? -EHOSTUNREACH : -ENETUNREACH;
1990 rt->dst.output = ip6_pkt_discard_out;
1991 rt->dst.input = ip6_pkt_discard;
1992 break;
1993 }
1994 goto install_route;
1995 }
1996
1997 if (cfg->fc_flags & RTF_GATEWAY) {
1998 const struct in6_addr *gw_addr;
1999 int gwa_type;
2000
2001 gw_addr = &cfg->fc_gateway;
2002 gwa_type = ipv6_addr_type(gw_addr);
2003
2004 /* if gw_addr is local we will fail to detect this in case
2005 * address is still TENTATIVE (DAD in progress). rt6_lookup()
2006 * will return already-added prefix route via interface that
2007 * prefix route was assigned to, which might be non-loopback.
2008 */
2009 err = -EINVAL;
2010 if (ipv6_chk_addr_and_flags(net, gw_addr,
2011 gwa_type & IPV6_ADDR_LINKLOCAL ?
2012 dev : NULL, 0, 0))
2013 goto out;
2014
2015 rt->rt6i_gateway = *gw_addr;
2016
2017 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
2018 struct rt6_info *grt = NULL;
2019
2020 /* IPv6 strictly inhibits using not link-local
2021 addresses as nexthop address.
2022 Otherwise, router will not able to send redirects.
2023 It is very good, but in some (rare!) circumstances
2024 (SIT, PtP, NBMA NOARP links) it is handy to allow
2025 some exceptions. --ANK
2026 We allow IPv4-mapped nexthops to support RFC4798-type
2027 addressing
2028 */
2029 if (!(gwa_type & (IPV6_ADDR_UNICAST |
2030 IPV6_ADDR_MAPPED)))
2031 goto out;
2032
2033 if (cfg->fc_table) {
2034 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
2035
2036 if (grt) {
2037 if (grt->rt6i_flags & RTF_GATEWAY ||
2038 (dev && dev != grt->dst.dev)) {
2039 ip6_rt_put(grt);
2040 grt = NULL;
2041 }
2042 }
2043 }
2044
2045 if (!grt)
2046 grt = rt6_lookup(net, gw_addr, NULL,
2047 cfg->fc_ifindex, 1);
2048
2049 err = -EHOSTUNREACH;
2050 if (!grt)
2051 goto out;
2052 if (dev) {
2053 if (dev != grt->dst.dev) {
2054 ip6_rt_put(grt);
2055 goto out;
2056 }
2057 } else {
2058 dev = grt->dst.dev;
2059 idev = grt->rt6i_idev;
2060 dev_hold(dev);
2061 in6_dev_hold(grt->rt6i_idev);
2062 }
2063 if (!(grt->rt6i_flags & RTF_GATEWAY))
2064 err = 0;
2065 ip6_rt_put(grt);
2066
2067 if (err)
2068 goto out;
2069 }
2070 err = -EINVAL;
2071 if (!dev || (dev->flags & IFF_LOOPBACK))
2072 goto out;
2073 }
2074
2075 err = -ENODEV;
2076 if (!dev)
2077 goto out;
2078
2079 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2080 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2081 err = -EINVAL;
2082 goto out;
2083 }
2084 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2085 rt->rt6i_prefsrc.plen = 128;
2086 } else
2087 rt->rt6i_prefsrc.plen = 0;
2088
2089 rt->rt6i_flags = cfg->fc_flags;
2090
2091 install_route:
2092 rt->dst.dev = dev;
2093 rt->rt6i_idev = idev;
2094 rt->rt6i_table = table;
2095
2096 cfg->fc_nlinfo.nl_net = dev_net(dev);
2097
2098 return rt;
2099 out:
2100 if (dev)
2101 dev_put(dev);
2102 if (idev)
2103 in6_dev_put(idev);
2104 if (rt)
2105 dst_free(&rt->dst);
2106
2107 return ERR_PTR(err);
2108 }
2109
2110 int ip6_route_add(struct fib6_config *cfg)
2111 {
2112 struct mx6_config mxc = { .mx = NULL, };
2113 struct rt6_info *rt;
2114 int err;
2115
2116 rt = ip6_route_info_create(cfg);
2117 if (IS_ERR(rt)) {
2118 err = PTR_ERR(rt);
2119 rt = NULL;
2120 goto out;
2121 }
2122
2123 err = ip6_convert_metrics(&mxc, cfg);
2124 if (err)
2125 goto out;
2126
2127 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2128
2129 kfree(mxc.mx);
2130
2131 return err;
2132 out:
2133 if (rt)
2134 dst_free(&rt->dst);
2135
2136 return err;
2137 }
2138
2139 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2140 {
2141 int err;
2142 struct fib6_table *table;
2143 struct net *net = dev_net(rt->dst.dev);
2144
2145 if (rt == net->ipv6.ip6_null_entry ||
2146 rt->dst.flags & DST_NOCACHE) {
2147 err = -ENOENT;
2148 goto out;
2149 }
2150
2151 table = rt->rt6i_table;
2152 write_lock_bh(&table->tb6_lock);
2153 err = fib6_del(rt, info);
2154 write_unlock_bh(&table->tb6_lock);
2155
2156 out:
2157 ip6_rt_put(rt);
2158 return err;
2159 }
2160
2161 int ip6_del_rt(struct rt6_info *rt)
2162 {
2163 struct nl_info info = {
2164 .nl_net = dev_net(rt->dst.dev),
2165 };
2166 return __ip6_del_rt(rt, &info);
2167 }
2168
2169 static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
2170 {
2171 struct nl_info *info = &cfg->fc_nlinfo;
2172 struct sk_buff *skb = NULL;
2173 struct fib6_table *table;
2174 int err;
2175
2176 table = rt->rt6i_table;
2177 write_lock_bh(&table->tb6_lock);
2178
2179 if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) {
2180 struct rt6_info *sibling, *next_sibling;
2181
2182 /* prefer to send a single notification with all hops */
2183 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
2184 if (skb) {
2185 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2186
2187 if (rt6_fill_node(info->nl_net, skb, rt,
2188 NULL, NULL, 0, RTM_DELROUTE,
2189 info->portid, seq, 0) < 0) {
2190 kfree_skb(skb);
2191 skb = NULL;
2192 } else
2193 info->skip_notify = 1;
2194 }
2195
2196 list_for_each_entry_safe(sibling, next_sibling,
2197 &rt->rt6i_siblings,
2198 rt6i_siblings) {
2199 err = fib6_del(sibling, info);
2200 if (err)
2201 goto out;
2202 }
2203 }
2204
2205 err = fib6_del(rt, info);
2206 out:
2207 write_unlock_bh(&table->tb6_lock);
2208 ip6_rt_put(rt);
2209
2210 if (skb) {
2211 rtnl_notify(skb, info->nl_net, info->portid, RTNLGRP_IPV6_ROUTE,
2212 info->nlh, gfp_any());
2213 }
2214 return err;
2215 }
2216
2217 static int ip6_route_del(struct fib6_config *cfg)
2218 {
2219 struct fib6_table *table;
2220 struct fib6_node *fn;
2221 struct rt6_info *rt;
2222 int err = -ESRCH;
2223
2224 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2225 if (!table)
2226 return err;
2227
2228 read_lock_bh(&table->tb6_lock);
2229
2230 fn = fib6_locate(&table->tb6_root,
2231 &cfg->fc_dst, cfg->fc_dst_len,
2232 &cfg->fc_src, cfg->fc_src_len);
2233
2234 if (fn) {
2235 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2236 if ((rt->rt6i_flags & RTF_CACHE) &&
2237 !(cfg->fc_flags & RTF_CACHE))
2238 continue;
2239 if (cfg->fc_ifindex &&
2240 (!rt->dst.dev ||
2241 rt->dst.dev->ifindex != cfg->fc_ifindex))
2242 continue;
2243 if (cfg->fc_flags & RTF_GATEWAY &&
2244 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2245 continue;
2246 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2247 continue;
2248 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
2249 continue;
2250 dst_hold(&rt->dst);
2251 read_unlock_bh(&table->tb6_lock);
2252
2253 /* if gateway was specified only delete the one hop */
2254 if (cfg->fc_flags & RTF_GATEWAY)
2255 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2256
2257 return __ip6_del_rt_siblings(rt, cfg);
2258 }
2259 }
2260 read_unlock_bh(&table->tb6_lock);
2261
2262 return err;
2263 }
2264
2265 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2266 {
2267 struct netevent_redirect netevent;
2268 struct rt6_info *rt, *nrt = NULL;
2269 struct ndisc_options ndopts;
2270 struct inet6_dev *in6_dev;
2271 struct neighbour *neigh;
2272 struct rd_msg *msg;
2273 int optlen, on_link;
2274 u8 *lladdr;
2275
2276 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2277 optlen -= sizeof(*msg);
2278
2279 if (optlen < 0) {
2280 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2281 return;
2282 }
2283
2284 msg = (struct rd_msg *)icmp6_hdr(skb);
2285
2286 if (ipv6_addr_is_multicast(&msg->dest)) {
2287 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2288 return;
2289 }
2290
2291 on_link = 0;
2292 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2293 on_link = 1;
2294 } else if (ipv6_addr_type(&msg->target) !=
2295 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2296 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2297 return;
2298 }
2299
2300 in6_dev = __in6_dev_get(skb->dev);
2301 if (!in6_dev)
2302 return;
2303 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2304 return;
2305
2306 /* RFC2461 8.1:
2307 * The IP source address of the Redirect MUST be the same as the current
2308 * first-hop router for the specified ICMP Destination Address.
2309 */
2310
2311 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
2312 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2313 return;
2314 }
2315
2316 lladdr = NULL;
2317 if (ndopts.nd_opts_tgt_lladdr) {
2318 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2319 skb->dev);
2320 if (!lladdr) {
2321 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2322 return;
2323 }
2324 }
2325
2326 rt = (struct rt6_info *) dst;
2327 if (rt->rt6i_flags & RTF_REJECT) {
2328 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2329 return;
2330 }
2331
2332 /* Redirect received -> path was valid.
2333 * Look, redirects are sent only in response to data packets,
2334 * so that this nexthop apparently is reachable. --ANK
2335 */
2336 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
2337
2338 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2339 if (!neigh)
2340 return;
2341
2342 /*
2343 * We have finally decided to accept it.
2344 */
2345
2346 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
2347 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2348 NEIGH_UPDATE_F_OVERRIDE|
2349 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2350 NEIGH_UPDATE_F_ISROUTER)),
2351 NDISC_REDIRECT, &ndopts);
2352
2353 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2354 if (!nrt)
2355 goto out;
2356
2357 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2358 if (on_link)
2359 nrt->rt6i_flags &= ~RTF_GATEWAY;
2360
2361 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2362
2363 if (ip6_ins_rt(nrt))
2364 goto out;
2365
2366 netevent.old = &rt->dst;
2367 netevent.new = &nrt->dst;
2368 netevent.daddr = &msg->dest;
2369 netevent.neigh = neigh;
2370 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2371
2372 if (rt->rt6i_flags & RTF_CACHE) {
2373 rt = (struct rt6_info *) dst_clone(&rt->dst);
2374 ip6_del_rt(rt);
2375 }
2376
2377 out:
2378 neigh_release(neigh);
2379 }
2380
2381 /*
2382 * Misc support functions
2383 */
2384
2385 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2386 {
2387 BUG_ON(from->dst.from);
2388
2389 rt->rt6i_flags &= ~RTF_EXPIRES;
2390 dst_hold(&from->dst);
2391 rt->dst.from = &from->dst;
2392 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2393 }
2394
2395 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2396 {
2397 rt->dst.input = ort->dst.input;
2398 rt->dst.output = ort->dst.output;
2399 rt->rt6i_dst = ort->rt6i_dst;
2400 rt->dst.error = ort->dst.error;
2401 rt->rt6i_idev = ort->rt6i_idev;
2402 if (rt->rt6i_idev)
2403 in6_dev_hold(rt->rt6i_idev);
2404 rt->dst.lastuse = jiffies;
2405 rt->rt6i_gateway = ort->rt6i_gateway;
2406 rt->rt6i_flags = ort->rt6i_flags;
2407 rt6_set_from(rt, ort);
2408 rt->rt6i_metric = ort->rt6i_metric;
2409 #ifdef CONFIG_IPV6_SUBTREES
2410 rt->rt6i_src = ort->rt6i_src;
2411 #endif
2412 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2413 rt->rt6i_table = ort->rt6i_table;
2414 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2415 }
2416
2417 #ifdef CONFIG_IPV6_ROUTE_INFO
2418 static struct rt6_info *rt6_get_route_info(struct net *net,
2419 const struct in6_addr *prefix, int prefixlen,
2420 const struct in6_addr *gwaddr,
2421 struct net_device *dev)
2422 {
2423 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
2424 int ifindex = dev->ifindex;
2425 struct fib6_node *fn;
2426 struct rt6_info *rt = NULL;
2427 struct fib6_table *table;
2428
2429 table = fib6_get_table(net, tb_id);
2430 if (!table)
2431 return NULL;
2432
2433 read_lock_bh(&table->tb6_lock);
2434 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2435 if (!fn)
2436 goto out;
2437
2438 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2439 if (rt->dst.dev->ifindex != ifindex)
2440 continue;
2441 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2442 continue;
2443 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2444 continue;
2445 dst_hold(&rt->dst);
2446 break;
2447 }
2448 out:
2449 read_unlock_bh(&table->tb6_lock);
2450 return rt;
2451 }
2452
2453 static struct rt6_info *rt6_add_route_info(struct net *net,
2454 const struct in6_addr *prefix, int prefixlen,
2455 const struct in6_addr *gwaddr,
2456 struct net_device *dev,
2457 unsigned int pref)
2458 {
2459 struct fib6_config cfg = {
2460 .fc_metric = IP6_RT_PRIO_USER,
2461 .fc_ifindex = dev->ifindex,
2462 .fc_dst_len = prefixlen,
2463 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2464 RTF_UP | RTF_PREF(pref),
2465 .fc_nlinfo.portid = 0,
2466 .fc_nlinfo.nlh = NULL,
2467 .fc_nlinfo.nl_net = net,
2468 };
2469
2470 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
2471 cfg.fc_dst = *prefix;
2472 cfg.fc_gateway = *gwaddr;
2473
2474 /* We should treat it as a default route if prefix length is 0. */
2475 if (!prefixlen)
2476 cfg.fc_flags |= RTF_DEFAULT;
2477
2478 ip6_route_add(&cfg);
2479
2480 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
2481 }
2482 #endif
2483
2484 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2485 {
2486 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
2487 struct rt6_info *rt;
2488 struct fib6_table *table;
2489
2490 table = fib6_get_table(dev_net(dev), tb_id);
2491 if (!table)
2492 return NULL;
2493
2494 read_lock_bh(&table->tb6_lock);
2495 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2496 if (dev == rt->dst.dev &&
2497 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2498 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2499 break;
2500 }
2501 if (rt)
2502 dst_hold(&rt->dst);
2503 read_unlock_bh(&table->tb6_lock);
2504 return rt;
2505 }
2506
2507 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2508 struct net_device *dev,
2509 unsigned int pref)
2510 {
2511 struct fib6_config cfg = {
2512 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2513 .fc_metric = IP6_RT_PRIO_USER,
2514 .fc_ifindex = dev->ifindex,
2515 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2516 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2517 .fc_nlinfo.portid = 0,
2518 .fc_nlinfo.nlh = NULL,
2519 .fc_nlinfo.nl_net = dev_net(dev),
2520 };
2521
2522 cfg.fc_gateway = *gwaddr;
2523
2524 if (!ip6_route_add(&cfg)) {
2525 struct fib6_table *table;
2526
2527 table = fib6_get_table(dev_net(dev), cfg.fc_table);
2528 if (table)
2529 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
2530 }
2531
2532 return rt6_get_dflt_router(gwaddr, dev);
2533 }
2534
2535 static void __rt6_purge_dflt_routers(struct fib6_table *table)
2536 {
2537 struct rt6_info *rt;
2538
2539 restart:
2540 read_lock_bh(&table->tb6_lock);
2541 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2542 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2543 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2544 dst_hold(&rt->dst);
2545 read_unlock_bh(&table->tb6_lock);
2546 ip6_del_rt(rt);
2547 goto restart;
2548 }
2549 }
2550 read_unlock_bh(&table->tb6_lock);
2551
2552 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
2553 }
2554
2555 void rt6_purge_dflt_routers(struct net *net)
2556 {
2557 struct fib6_table *table;
2558 struct hlist_head *head;
2559 unsigned int h;
2560
2561 rcu_read_lock();
2562
2563 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
2564 head = &net->ipv6.fib_table_hash[h];
2565 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
2566 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
2567 __rt6_purge_dflt_routers(table);
2568 }
2569 }
2570
2571 rcu_read_unlock();
2572 }
2573
2574 static void rtmsg_to_fib6_config(struct net *net,
2575 struct in6_rtmsg *rtmsg,
2576 struct fib6_config *cfg)
2577 {
2578 memset(cfg, 0, sizeof(*cfg));
2579
2580 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2581 : RT6_TABLE_MAIN;
2582 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2583 cfg->fc_metric = rtmsg->rtmsg_metric;
2584 cfg->fc_expires = rtmsg->rtmsg_info;
2585 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2586 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2587 cfg->fc_flags = rtmsg->rtmsg_flags;
2588
2589 cfg->fc_nlinfo.nl_net = net;
2590
2591 cfg->fc_dst = rtmsg->rtmsg_dst;
2592 cfg->fc_src = rtmsg->rtmsg_src;
2593 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2594 }
2595
2596 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2597 {
2598 struct fib6_config cfg;
2599 struct in6_rtmsg rtmsg;
2600 int err;
2601
2602 switch (cmd) {
2603 case SIOCADDRT: /* Add a route */
2604 case SIOCDELRT: /* Delete a route */
2605 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2606 return -EPERM;
2607 err = copy_from_user(&rtmsg, arg,
2608 sizeof(struct in6_rtmsg));
2609 if (err)
2610 return -EFAULT;
2611
2612 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2613
2614 rtnl_lock();
2615 switch (cmd) {
2616 case SIOCADDRT:
2617 err = ip6_route_add(&cfg);
2618 break;
2619 case SIOCDELRT:
2620 err = ip6_route_del(&cfg);
2621 break;
2622 default:
2623 err = -EINVAL;
2624 }
2625 rtnl_unlock();
2626
2627 return err;
2628 }
2629
2630 return -EINVAL;
2631 }
2632
2633 /*
2634 * Drop the packet on the floor
2635 */
2636
2637 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2638 {
2639 int type;
2640 struct dst_entry *dst = skb_dst(skb);
2641 switch (ipstats_mib_noroutes) {
2642 case IPSTATS_MIB_INNOROUTES:
2643 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2644 if (type == IPV6_ADDR_ANY) {
2645 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2646 IPSTATS_MIB_INADDRERRORS);
2647 break;
2648 }
2649 /* FALLTHROUGH */
2650 case IPSTATS_MIB_OUTNOROUTES:
2651 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2652 ipstats_mib_noroutes);
2653 break;
2654 }
2655 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2656 kfree_skb(skb);
2657 return 0;
2658 }
2659
2660 static int ip6_pkt_discard(struct sk_buff *skb)
2661 {
2662 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2663 }
2664
2665 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2666 {
2667 skb->dev = skb_dst(skb)->dev;
2668 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2669 }
2670
2671 static int ip6_pkt_prohibit(struct sk_buff *skb)
2672 {
2673 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2674 }
2675
2676 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2677 {
2678 skb->dev = skb_dst(skb)->dev;
2679 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2680 }
2681
2682 /*
2683 * Allocate a dst for local (unicast / anycast) address.
2684 */
2685
2686 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2687 const struct in6_addr *addr,
2688 bool anycast)
2689 {
2690 u32 tb_id;
2691 struct net *net = dev_net(idev->dev);
2692 struct net_device *dev = net->loopback_dev;
2693 struct rt6_info *rt;
2694
2695 /* use L3 Master device as loopback for host routes if device
2696 * is enslaved and address is not link local or multicast
2697 */
2698 if (!rt6_need_strict(addr))
2699 dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
2700
2701 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
2702 if (!rt)
2703 return ERR_PTR(-ENOMEM);
2704
2705 in6_dev_hold(idev);
2706
2707 rt->dst.flags |= DST_HOST;
2708 rt->dst.input = ip6_input;
2709 rt->dst.output = ip6_output;
2710 rt->rt6i_idev = idev;
2711
2712 rt->rt6i_protocol = RTPROT_KERNEL;
2713 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2714 if (anycast)
2715 rt->rt6i_flags |= RTF_ANYCAST;
2716 else
2717 rt->rt6i_flags |= RTF_LOCAL;
2718
2719 rt->rt6i_gateway = *addr;
2720 rt->rt6i_dst.addr = *addr;
2721 rt->rt6i_dst.plen = 128;
2722 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2723 rt->rt6i_table = fib6_get_table(net, tb_id);
2724 rt->dst.flags |= DST_NOCACHE;
2725
2726 atomic_set(&rt->dst.__refcnt, 1);
2727
2728 return rt;
2729 }
2730
2731 /* remove deleted ip from prefsrc entries */
2732 struct arg_dev_net_ip {
2733 struct net_device *dev;
2734 struct net *net;
2735 struct in6_addr *addr;
2736 };
2737
2738 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2739 {
2740 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2741 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2742 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2743
2744 if (((void *)rt->dst.dev == dev || !dev) &&
2745 rt != net->ipv6.ip6_null_entry &&
2746 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2747 /* remove prefsrc entry */
2748 rt->rt6i_prefsrc.plen = 0;
2749 }
2750 return 0;
2751 }
2752
2753 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2754 {
2755 struct net *net = dev_net(ifp->idev->dev);
2756 struct arg_dev_net_ip adni = {
2757 .dev = ifp->idev->dev,
2758 .net = net,
2759 .addr = &ifp->addr,
2760 };
2761 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2762 }
2763
2764 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2765 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2766
2767 /* Remove routers and update dst entries when gateway turn into host. */
2768 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2769 {
2770 struct in6_addr *gateway = (struct in6_addr *)arg;
2771
2772 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2773 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2774 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2775 return -1;
2776 }
2777 return 0;
2778 }
2779
2780 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2781 {
2782 fib6_clean_all(net, fib6_clean_tohost, gateway);
2783 }
2784
2785 struct arg_dev_net {
2786 struct net_device *dev;
2787 struct net *net;
2788 };
2789
2790 /* called with write lock held for table with rt */
2791 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2792 {
2793 const struct arg_dev_net *adn = arg;
2794 const struct net_device *dev = adn->dev;
2795
2796 if ((rt->dst.dev == dev || !dev) &&
2797 rt != adn->net->ipv6.ip6_null_entry &&
2798 (rt->rt6i_nsiblings == 0 ||
2799 !rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
2800 return -1;
2801
2802 return 0;
2803 }
2804
2805 void rt6_ifdown(struct net *net, struct net_device *dev)
2806 {
2807 struct arg_dev_net adn = {
2808 .dev = dev,
2809 .net = net,
2810 };
2811
2812 fib6_clean_all(net, fib6_ifdown, &adn);
2813 icmp6_clean_all(fib6_ifdown, &adn);
2814 if (dev)
2815 rt6_uncached_list_flush_dev(net, dev);
2816 }
2817
2818 struct rt6_mtu_change_arg {
2819 struct net_device *dev;
2820 unsigned int mtu;
2821 };
2822
2823 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2824 {
2825 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2826 struct inet6_dev *idev;
2827
2828 /* In IPv6 pmtu discovery is not optional,
2829 so that RTAX_MTU lock cannot disable it.
2830 We still use this lock to block changes
2831 caused by addrconf/ndisc.
2832 */
2833
2834 idev = __in6_dev_get(arg->dev);
2835 if (!idev)
2836 return 0;
2837
2838 /* For administrative MTU increase, there is no way to discover
2839 IPv6 PMTU increase, so PMTU increase should be updated here.
2840 Since RFC 1981 doesn't include administrative MTU increase
2841 update PMTU increase is a MUST. (i.e. jumbo frame)
2842 */
2843 /*
2844 If new MTU is less than route PMTU, this new MTU will be the
2845 lowest MTU in the path, update the route PMTU to reflect PMTU
2846 decreases; if new MTU is greater than route PMTU, and the
2847 old MTU is the lowest MTU in the path, update the route PMTU
2848 to reflect the increase. In this case if the other nodes' MTU
2849 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2850 PMTU discovery.
2851 */
2852 if (rt->dst.dev == arg->dev &&
2853 dst_metric_raw(&rt->dst, RTAX_MTU) &&
2854 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2855 if (rt->rt6i_flags & RTF_CACHE) {
2856 /* For RTF_CACHE with rt6i_pmtu == 0
2857 * (i.e. a redirected route),
2858 * the metrics of its rt->dst.from has already
2859 * been updated.
2860 */
2861 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2862 rt->rt6i_pmtu = arg->mtu;
2863 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2864 (dst_mtu(&rt->dst) < arg->mtu &&
2865 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2866 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2867 }
2868 }
2869 return 0;
2870 }
2871
2872 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2873 {
2874 struct rt6_mtu_change_arg arg = {
2875 .dev = dev,
2876 .mtu = mtu,
2877 };
2878
2879 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2880 }
2881
2882 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2883 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2884 [RTA_OIF] = { .type = NLA_U32 },
2885 [RTA_IIF] = { .type = NLA_U32 },
2886 [RTA_PRIORITY] = { .type = NLA_U32 },
2887 [RTA_METRICS] = { .type = NLA_NESTED },
2888 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2889 [RTA_PREF] = { .type = NLA_U8 },
2890 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2891 [RTA_ENCAP] = { .type = NLA_NESTED },
2892 [RTA_EXPIRES] = { .type = NLA_U32 },
2893 [RTA_UID] = { .type = NLA_U32 },
2894 };
2895
2896 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2897 struct fib6_config *cfg)
2898 {
2899 struct rtmsg *rtm;
2900 struct nlattr *tb[RTA_MAX+1];
2901 unsigned int pref;
2902 int err;
2903
2904 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2905 if (err < 0)
2906 goto errout;
2907
2908 err = -EINVAL;
2909 rtm = nlmsg_data(nlh);
2910 memset(cfg, 0, sizeof(*cfg));
2911
2912 cfg->fc_table = rtm->rtm_table;
2913 cfg->fc_dst_len = rtm->rtm_dst_len;
2914 cfg->fc_src_len = rtm->rtm_src_len;
2915 cfg->fc_flags = RTF_UP;
2916 cfg->fc_protocol = rtm->rtm_protocol;
2917 cfg->fc_type = rtm->rtm_type;
2918
2919 if (rtm->rtm_type == RTN_UNREACHABLE ||
2920 rtm->rtm_type == RTN_BLACKHOLE ||
2921 rtm->rtm_type == RTN_PROHIBIT ||
2922 rtm->rtm_type == RTN_THROW)
2923 cfg->fc_flags |= RTF_REJECT;
2924
2925 if (rtm->rtm_type == RTN_LOCAL)
2926 cfg->fc_flags |= RTF_LOCAL;
2927
2928 if (rtm->rtm_flags & RTM_F_CLONED)
2929 cfg->fc_flags |= RTF_CACHE;
2930
2931 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2932 cfg->fc_nlinfo.nlh = nlh;
2933 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2934
2935 if (tb[RTA_GATEWAY]) {
2936 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2937 cfg->fc_flags |= RTF_GATEWAY;
2938 }
2939
2940 if (tb[RTA_DST]) {
2941 int plen = (rtm->rtm_dst_len + 7) >> 3;
2942
2943 if (nla_len(tb[RTA_DST]) < plen)
2944 goto errout;
2945
2946 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2947 }
2948
2949 if (tb[RTA_SRC]) {
2950 int plen = (rtm->rtm_src_len + 7) >> 3;
2951
2952 if (nla_len(tb[RTA_SRC]) < plen)
2953 goto errout;
2954
2955 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2956 }
2957
2958 if (tb[RTA_PREFSRC])
2959 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2960
2961 if (tb[RTA_OIF])
2962 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2963
2964 if (tb[RTA_PRIORITY])
2965 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2966
2967 if (tb[RTA_METRICS]) {
2968 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2969 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2970 }
2971
2972 if (tb[RTA_TABLE])
2973 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2974
2975 if (tb[RTA_MULTIPATH]) {
2976 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2977 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2978
2979 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
2980 cfg->fc_mp_len);
2981 if (err < 0)
2982 goto errout;
2983 }
2984
2985 if (tb[RTA_PREF]) {
2986 pref = nla_get_u8(tb[RTA_PREF]);
2987 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2988 pref != ICMPV6_ROUTER_PREF_HIGH)
2989 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2990 cfg->fc_flags |= RTF_PREF(pref);
2991 }
2992
2993 if (tb[RTA_ENCAP])
2994 cfg->fc_encap = tb[RTA_ENCAP];
2995
2996 if (tb[RTA_ENCAP_TYPE]) {
2997 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2998
2999 err = lwtunnel_valid_encap_type(cfg->fc_encap_type);
3000 if (err < 0)
3001 goto errout;
3002 }
3003
3004 if (tb[RTA_EXPIRES]) {
3005 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
3006
3007 if (addrconf_finite_timeout(timeout)) {
3008 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
3009 cfg->fc_flags |= RTF_EXPIRES;
3010 }
3011 }
3012
3013 err = 0;
3014 errout:
3015 return err;
3016 }
3017
3018 struct rt6_nh {
3019 struct rt6_info *rt6_info;
3020 struct fib6_config r_cfg;
3021 struct mx6_config mxc;
3022 struct list_head next;
3023 };
3024
3025 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
3026 {
3027 struct rt6_nh *nh;
3028
3029 list_for_each_entry(nh, rt6_nh_list, next) {
3030 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n",
3031 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
3032 nh->r_cfg.fc_ifindex);
3033 }
3034 }
3035
3036 static int ip6_route_info_append(struct list_head *rt6_nh_list,
3037 struct rt6_info *rt, struct fib6_config *r_cfg)
3038 {
3039 struct rt6_nh *nh;
3040 struct rt6_info *rtnh;
3041 int err = -EEXIST;
3042
3043 list_for_each_entry(nh, rt6_nh_list, next) {
3044 /* check if rt6_info already exists */
3045 rtnh = nh->rt6_info;
3046
3047 if (rtnh->dst.dev == rt->dst.dev &&
3048 rtnh->rt6i_idev == rt->rt6i_idev &&
3049 ipv6_addr_equal(&rtnh->rt6i_gateway,
3050 &rt->rt6i_gateway))
3051 return err;
3052 }
3053
3054 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
3055 if (!nh)
3056 return -ENOMEM;
3057 nh->rt6_info = rt;
3058 err = ip6_convert_metrics(&nh->mxc, r_cfg);
3059 if (err) {
3060 kfree(nh);
3061 return err;
3062 }
3063 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
3064 list_add_tail(&nh->next, rt6_nh_list);
3065
3066 return 0;
3067 }
3068
3069 static void ip6_route_mpath_notify(struct rt6_info *rt,
3070 struct rt6_info *rt_last,
3071 struct nl_info *info,
3072 __u16 nlflags)
3073 {
3074 /* if this is an APPEND route, then rt points to the first route
3075 * inserted and rt_last points to last route inserted. Userspace
3076 * wants a consistent dump of the route which starts at the first
3077 * nexthop. Since sibling routes are always added at the end of
3078 * the list, find the first sibling of the last route appended
3079 */
3080 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) {
3081 rt = list_first_entry(&rt_last->rt6i_siblings,
3082 struct rt6_info,
3083 rt6i_siblings);
3084 }
3085
3086 if (rt)
3087 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
3088 }
3089
3090 static int ip6_route_multipath_add(struct fib6_config *cfg)
3091 {
3092 struct rt6_info *rt_notif = NULL, *rt_last = NULL;
3093 struct nl_info *info = &cfg->fc_nlinfo;
3094 struct fib6_config r_cfg;
3095 struct rtnexthop *rtnh;
3096 struct rt6_info *rt;
3097 struct rt6_nh *err_nh;
3098 struct rt6_nh *nh, *nh_safe;
3099 __u16 nlflags;
3100 int remaining;
3101 int attrlen;
3102 int err = 1;
3103 int nhn = 0;
3104 int replace = (cfg->fc_nlinfo.nlh &&
3105 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
3106 LIST_HEAD(rt6_nh_list);
3107
3108 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
3109 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
3110 nlflags |= NLM_F_APPEND;
3111
3112 remaining = cfg->fc_mp_len;
3113 rtnh = (struct rtnexthop *)cfg->fc_mp;
3114
3115 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
3116 * rt6_info structs per nexthop
3117 */
3118 while (rtnh_ok(rtnh, remaining)) {
3119 memcpy(&r_cfg, cfg, sizeof(*cfg));
3120 if (rtnh->rtnh_ifindex)
3121 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3122
3123 attrlen = rtnh_attrlen(rtnh);
3124 if (attrlen > 0) {
3125 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3126
3127 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3128 if (nla) {
3129 r_cfg.fc_gateway = nla_get_in6_addr(nla);
3130 r_cfg.fc_flags |= RTF_GATEWAY;
3131 }
3132 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
3133 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
3134 if (nla)
3135 r_cfg.fc_encap_type = nla_get_u16(nla);
3136 }
3137
3138 rt = ip6_route_info_create(&r_cfg);
3139 if (IS_ERR(rt)) {
3140 err = PTR_ERR(rt);
3141 rt = NULL;
3142 goto cleanup;
3143 }
3144
3145 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
3146 if (err) {
3147 dst_free(&rt->dst);
3148 goto cleanup;
3149 }
3150
3151 rtnh = rtnh_next(rtnh, &remaining);
3152 }
3153
3154 /* for add and replace send one notification with all nexthops.
3155 * Skip the notification in fib6_add_rt2node and send one with
3156 * the full route when done
3157 */
3158 info->skip_notify = 1;
3159
3160 err_nh = NULL;
3161 list_for_each_entry(nh, &rt6_nh_list, next) {
3162 rt_last = nh->rt6_info;
3163 err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc);
3164 /* save reference to first route for notification */
3165 if (!rt_notif && !err)
3166 rt_notif = nh->rt6_info;
3167
3168 /* nh->rt6_info is used or freed at this point, reset to NULL*/
3169 nh->rt6_info = NULL;
3170 if (err) {
3171 if (replace && nhn)
3172 ip6_print_replace_route_err(&rt6_nh_list);
3173 err_nh = nh;
3174 goto add_errout;
3175 }
3176
3177 /* Because each route is added like a single route we remove
3178 * these flags after the first nexthop: if there is a collision,
3179 * we have already failed to add the first nexthop:
3180 * fib6_add_rt2node() has rejected it; when replacing, old
3181 * nexthops have been replaced by first new, the rest should
3182 * be added to it.
3183 */
3184 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3185 NLM_F_REPLACE);
3186 nhn++;
3187 }
3188
3189 /* success ... tell user about new route */
3190 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
3191 goto cleanup;
3192
3193 add_errout:
3194 /* send notification for routes that were added so that
3195 * the delete notifications sent by ip6_route_del are
3196 * coherent
3197 */
3198 if (rt_notif)
3199 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
3200
3201 /* Delete routes that were already added */
3202 list_for_each_entry(nh, &rt6_nh_list, next) {
3203 if (err_nh == nh)
3204 break;
3205 ip6_route_del(&nh->r_cfg);
3206 }
3207
3208 cleanup:
3209 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3210 if (nh->rt6_info)
3211 dst_free(&nh->rt6_info->dst);
3212 kfree(nh->mxc.mx);
3213 list_del(&nh->next);
3214 kfree(nh);
3215 }
3216
3217 return err;
3218 }
3219
3220 static int ip6_route_multipath_del(struct fib6_config *cfg)
3221 {
3222 struct fib6_config r_cfg;
3223 struct rtnexthop *rtnh;
3224 int remaining;
3225 int attrlen;
3226 int err = 1, last_err = 0;
3227
3228 remaining = cfg->fc_mp_len;
3229 rtnh = (struct rtnexthop *)cfg->fc_mp;
3230
3231 /* Parse a Multipath Entry */
3232 while (rtnh_ok(rtnh, remaining)) {
3233 memcpy(&r_cfg, cfg, sizeof(*cfg));
3234 if (rtnh->rtnh_ifindex)
3235 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3236
3237 attrlen = rtnh_attrlen(rtnh);
3238 if (attrlen > 0) {
3239 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3240
3241 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3242 if (nla) {
3243 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3244 r_cfg.fc_flags |= RTF_GATEWAY;
3245 }
3246 }
3247 err = ip6_route_del(&r_cfg);
3248 if (err)
3249 last_err = err;
3250
3251 rtnh = rtnh_next(rtnh, &remaining);
3252 }
3253
3254 return last_err;
3255 }
3256
3257 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3258 {
3259 struct fib6_config cfg;
3260 int err;
3261
3262 err = rtm_to_fib6_config(skb, nlh, &cfg);
3263 if (err < 0)
3264 return err;
3265
3266 if (cfg.fc_mp)
3267 return ip6_route_multipath_del(&cfg);
3268 else {
3269 cfg.fc_delete_all_nh = 1;
3270 return ip6_route_del(&cfg);
3271 }
3272 }
3273
3274 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
3275 {
3276 struct fib6_config cfg;
3277 int err;
3278
3279 err = rtm_to_fib6_config(skb, nlh, &cfg);
3280 if (err < 0)
3281 return err;
3282
3283 if (cfg.fc_mp)
3284 return ip6_route_multipath_add(&cfg);
3285 else
3286 return ip6_route_add(&cfg);
3287 }
3288
3289 static size_t rt6_nlmsg_size(struct rt6_info *rt)
3290 {
3291 int nexthop_len = 0;
3292
3293 if (rt->rt6i_nsiblings) {
3294 nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
3295 + NLA_ALIGN(sizeof(struct rtnexthop))
3296 + nla_total_size(16) /* RTA_GATEWAY */
3297 + nla_total_size(4) /* RTA_OIF */
3298 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3299
3300 nexthop_len *= rt->rt6i_nsiblings;
3301 }
3302
3303 return NLMSG_ALIGN(sizeof(struct rtmsg))
3304 + nla_total_size(16) /* RTA_SRC */
3305 + nla_total_size(16) /* RTA_DST */
3306 + nla_total_size(16) /* RTA_GATEWAY */
3307 + nla_total_size(16) /* RTA_PREFSRC */
3308 + nla_total_size(4) /* RTA_TABLE */
3309 + nla_total_size(4) /* RTA_IIF */
3310 + nla_total_size(4) /* RTA_OIF */
3311 + nla_total_size(4) /* RTA_PRIORITY */
3312 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3313 + nla_total_size(sizeof(struct rta_cacheinfo))
3314 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3315 + nla_total_size(1) /* RTA_PREF */
3316 + lwtunnel_get_encap_size(rt->dst.lwtstate)
3317 + nexthop_len;
3318 }
3319
3320 static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
3321 unsigned int *flags)
3322 {
3323 if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) {
3324 *flags |= RTNH_F_LINKDOWN;
3325 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3326 *flags |= RTNH_F_DEAD;
3327 }
3328
3329 if (rt->rt6i_flags & RTF_GATEWAY) {
3330 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3331 goto nla_put_failure;
3332 }
3333
3334 if (rt->dst.dev &&
3335 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3336 goto nla_put_failure;
3337
3338 if (rt->dst.lwtstate &&
3339 lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
3340 goto nla_put_failure;
3341
3342 return 0;
3343
3344 nla_put_failure:
3345 return -EMSGSIZE;
3346 }
3347
3348 static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
3349 {
3350 struct rtnexthop *rtnh;
3351 unsigned int flags = 0;
3352
3353 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
3354 if (!rtnh)
3355 goto nla_put_failure;
3356
3357 rtnh->rtnh_hops = 0;
3358 rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0;
3359
3360 if (rt6_nexthop_info(skb, rt, &flags) < 0)
3361 goto nla_put_failure;
3362
3363 rtnh->rtnh_flags = flags;
3364
3365 /* length of rtnetlink header + attributes */
3366 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
3367
3368 return 0;
3369
3370 nla_put_failure:
3371 return -EMSGSIZE;
3372 }
3373
3374 static int rt6_fill_node(struct net *net,
3375 struct sk_buff *skb, struct rt6_info *rt,
3376 struct in6_addr *dst, struct in6_addr *src,
3377 int iif, int type, u32 portid, u32 seq,
3378 unsigned int flags)
3379 {
3380 u32 metrics[RTAX_MAX];
3381 struct rtmsg *rtm;
3382 struct nlmsghdr *nlh;
3383 long expires;
3384 u32 table;
3385
3386 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3387 if (!nlh)
3388 return -EMSGSIZE;
3389
3390 rtm = nlmsg_data(nlh);
3391 rtm->rtm_family = AF_INET6;
3392 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3393 rtm->rtm_src_len = rt->rt6i_src.plen;
3394 rtm->rtm_tos = 0;
3395 if (rt->rt6i_table)
3396 table = rt->rt6i_table->tb6_id;
3397 else
3398 table = RT6_TABLE_UNSPEC;
3399 rtm->rtm_table = table;
3400 if (nla_put_u32(skb, RTA_TABLE, table))
3401 goto nla_put_failure;
3402 if (rt->rt6i_flags & RTF_REJECT) {
3403 switch (rt->dst.error) {
3404 case -EINVAL:
3405 rtm->rtm_type = RTN_BLACKHOLE;
3406 break;
3407 case -EACCES:
3408 rtm->rtm_type = RTN_PROHIBIT;
3409 break;
3410 case -EAGAIN:
3411 rtm->rtm_type = RTN_THROW;
3412 break;
3413 default:
3414 rtm->rtm_type = RTN_UNREACHABLE;
3415 break;
3416 }
3417 }
3418 else if (rt->rt6i_flags & RTF_LOCAL)
3419 rtm->rtm_type = RTN_LOCAL;
3420 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3421 rtm->rtm_type = RTN_LOCAL;
3422 else
3423 rtm->rtm_type = RTN_UNICAST;
3424 rtm->rtm_flags = 0;
3425 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3426 rtm->rtm_protocol = rt->rt6i_protocol;
3427 if (rt->rt6i_flags & RTF_DYNAMIC)
3428 rtm->rtm_protocol = RTPROT_REDIRECT;
3429 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3430 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3431 rtm->rtm_protocol = RTPROT_RA;
3432 else
3433 rtm->rtm_protocol = RTPROT_KERNEL;
3434 }
3435
3436 if (rt->rt6i_flags & RTF_CACHE)
3437 rtm->rtm_flags |= RTM_F_CLONED;
3438
3439 if (dst) {
3440 if (nla_put_in6_addr(skb, RTA_DST, dst))
3441 goto nla_put_failure;
3442 rtm->rtm_dst_len = 128;
3443 } else if (rtm->rtm_dst_len)
3444 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3445 goto nla_put_failure;
3446 #ifdef CONFIG_IPV6_SUBTREES
3447 if (src) {
3448 if (nla_put_in6_addr(skb, RTA_SRC, src))
3449 goto nla_put_failure;
3450 rtm->rtm_src_len = 128;
3451 } else if (rtm->rtm_src_len &&
3452 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3453 goto nla_put_failure;
3454 #endif
3455 if (iif) {
3456 #ifdef CONFIG_IPV6_MROUTE
3457 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3458 int err = ip6mr_get_route(net, skb, rtm, portid);
3459
3460 if (err == 0)
3461 return 0;
3462 if (err < 0)
3463 goto nla_put_failure;
3464 } else
3465 #endif
3466 if (nla_put_u32(skb, RTA_IIF, iif))
3467 goto nla_put_failure;
3468 } else if (dst) {
3469 struct in6_addr saddr_buf;
3470 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3471 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3472 goto nla_put_failure;
3473 }
3474
3475 if (rt->rt6i_prefsrc.plen) {
3476 struct in6_addr saddr_buf;
3477 saddr_buf = rt->rt6i_prefsrc.addr;
3478 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3479 goto nla_put_failure;
3480 }
3481
3482 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3483 if (rt->rt6i_pmtu)
3484 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3485 if (rtnetlink_put_metrics(skb, metrics) < 0)
3486 goto nla_put_failure;
3487
3488 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3489 goto nla_put_failure;
3490
3491 /* For multipath routes, walk the siblings list and add
3492 * each as a nexthop within RTA_MULTIPATH.
3493 */
3494 if (rt->rt6i_nsiblings) {
3495 struct rt6_info *sibling, *next_sibling;
3496 struct nlattr *mp;
3497
3498 mp = nla_nest_start(skb, RTA_MULTIPATH);
3499 if (!mp)
3500 goto nla_put_failure;
3501
3502 if (rt6_add_nexthop(skb, rt) < 0)
3503 goto nla_put_failure;
3504
3505 list_for_each_entry_safe(sibling, next_sibling,
3506 &rt->rt6i_siblings, rt6i_siblings) {
3507 if (rt6_add_nexthop(skb, sibling) < 0)
3508 goto nla_put_failure;
3509 }
3510
3511 nla_nest_end(skb, mp);
3512 } else {
3513 if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags) < 0)
3514 goto nla_put_failure;
3515 }
3516
3517 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3518
3519 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3520 goto nla_put_failure;
3521
3522 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3523 goto nla_put_failure;
3524
3525
3526 nlmsg_end(skb, nlh);
3527 return 0;
3528
3529 nla_put_failure:
3530 nlmsg_cancel(skb, nlh);
3531 return -EMSGSIZE;
3532 }
3533
3534 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3535 {
3536 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3537 struct net *net = arg->net;
3538
3539 if (rt == net->ipv6.ip6_null_entry)
3540 return 0;
3541
3542 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3543 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3544
3545 /* user wants prefix routes only */
3546 if (rtm->rtm_flags & RTM_F_PREFIX &&
3547 !(rt->rt6i_flags & RTF_PREFIX_RT)) {
3548 /* success since this is not a prefix route */
3549 return 1;
3550 }
3551 }
3552
3553 return rt6_fill_node(net,
3554 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3555 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3556 NLM_F_MULTI);
3557 }
3558
3559 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3560 {
3561 struct net *net = sock_net(in_skb->sk);
3562 struct nlattr *tb[RTA_MAX+1];
3563 struct rt6_info *rt;
3564 struct sk_buff *skb;
3565 struct rtmsg *rtm;
3566 struct flowi6 fl6;
3567 int err, iif = 0, oif = 0;
3568
3569 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
3570 if (err < 0)
3571 goto errout;
3572
3573 err = -EINVAL;
3574 memset(&fl6, 0, sizeof(fl6));
3575 rtm = nlmsg_data(nlh);
3576 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
3577
3578 if (tb[RTA_SRC]) {
3579 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3580 goto errout;
3581
3582 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3583 }
3584
3585 if (tb[RTA_DST]) {
3586 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3587 goto errout;
3588
3589 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3590 }
3591
3592 if (tb[RTA_IIF])
3593 iif = nla_get_u32(tb[RTA_IIF]);
3594
3595 if (tb[RTA_OIF])
3596 oif = nla_get_u32(tb[RTA_OIF]);
3597
3598 if (tb[RTA_MARK])
3599 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3600
3601 if (tb[RTA_UID])
3602 fl6.flowi6_uid = make_kuid(current_user_ns(),
3603 nla_get_u32(tb[RTA_UID]));
3604 else
3605 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3606
3607 if (iif) {
3608 struct net_device *dev;
3609 int flags = 0;
3610
3611 dev = __dev_get_by_index(net, iif);
3612 if (!dev) {
3613 err = -ENODEV;
3614 goto errout;
3615 }
3616
3617 fl6.flowi6_iif = iif;
3618
3619 if (!ipv6_addr_any(&fl6.saddr))
3620 flags |= RT6_LOOKUP_F_HAS_SADDR;
3621
3622 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3623 flags);
3624 } else {
3625 fl6.flowi6_oif = oif;
3626
3627 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3628 }
3629
3630 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3631 if (!skb) {
3632 ip6_rt_put(rt);
3633 err = -ENOBUFS;
3634 goto errout;
3635 }
3636
3637 skb_dst_set(skb, &rt->dst);
3638
3639 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3640 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3641 nlh->nlmsg_seq, 0);
3642 if (err < 0) {
3643 kfree_skb(skb);
3644 goto errout;
3645 }
3646
3647 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3648 errout:
3649 return err;
3650 }
3651
3652 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3653 unsigned int nlm_flags)
3654 {
3655 struct sk_buff *skb;
3656 struct net *net = info->nl_net;
3657 u32 seq;
3658 int err;
3659
3660 err = -ENOBUFS;
3661 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3662
3663 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3664 if (!skb)
3665 goto errout;
3666
3667 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3668 event, info->portid, seq, nlm_flags);
3669 if (err < 0) {
3670 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3671 WARN_ON(err == -EMSGSIZE);
3672 kfree_skb(skb);
3673 goto errout;
3674 }
3675 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3676 info->nlh, gfp_any());
3677 return;
3678 errout:
3679 if (err < 0)
3680 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3681 }
3682
3683 static int ip6_route_dev_notify(struct notifier_block *this,
3684 unsigned long event, void *ptr)
3685 {
3686 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3687 struct net *net = dev_net(dev);
3688
3689 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3690 net->ipv6.ip6_null_entry->dst.dev = dev;
3691 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3692 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3693 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3694 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3695 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3696 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3697 #endif
3698 }
3699
3700 return NOTIFY_OK;
3701 }
3702
3703 /*
3704 * /proc
3705 */
3706
3707 #ifdef CONFIG_PROC_FS
3708
3709 static const struct file_operations ipv6_route_proc_fops = {
3710 .owner = THIS_MODULE,
3711 .open = ipv6_route_open,
3712 .read = seq_read,
3713 .llseek = seq_lseek,
3714 .release = seq_release_net,
3715 };
3716
3717 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3718 {
3719 struct net *net = (struct net *)seq->private;
3720 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3721 net->ipv6.rt6_stats->fib_nodes,
3722 net->ipv6.rt6_stats->fib_route_nodes,
3723 net->ipv6.rt6_stats->fib_rt_alloc,
3724 net->ipv6.rt6_stats->fib_rt_entries,
3725 net->ipv6.rt6_stats->fib_rt_cache,
3726 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3727 net->ipv6.rt6_stats->fib_discarded_routes);
3728
3729 return 0;
3730 }
3731
3732 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3733 {
3734 return single_open_net(inode, file, rt6_stats_seq_show);
3735 }
3736
3737 static const struct file_operations rt6_stats_seq_fops = {
3738 .owner = THIS_MODULE,
3739 .open = rt6_stats_seq_open,
3740 .read = seq_read,
3741 .llseek = seq_lseek,
3742 .release = single_release_net,
3743 };
3744 #endif /* CONFIG_PROC_FS */
3745
3746 #ifdef CONFIG_SYSCTL
3747
3748 static
3749 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3750 void __user *buffer, size_t *lenp, loff_t *ppos)
3751 {
3752 struct net *net;
3753 int delay;
3754 if (!write)
3755 return -EINVAL;
3756
3757 net = (struct net *)ctl->extra1;
3758 delay = net->ipv6.sysctl.flush_delay;
3759 proc_dointvec(ctl, write, buffer, lenp, ppos);
3760 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3761 return 0;
3762 }
3763
3764 struct ctl_table ipv6_route_table_template[] = {
3765 {
3766 .procname = "flush",
3767 .data = &init_net.ipv6.sysctl.flush_delay,
3768 .maxlen = sizeof(int),
3769 .mode = 0200,
3770 .proc_handler = ipv6_sysctl_rtcache_flush
3771 },
3772 {
3773 .procname = "gc_thresh",
3774 .data = &ip6_dst_ops_template.gc_thresh,
3775 .maxlen = sizeof(int),
3776 .mode = 0644,
3777 .proc_handler = proc_dointvec,
3778 },
3779 {
3780 .procname = "max_size",
3781 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3782 .maxlen = sizeof(int),
3783 .mode = 0644,
3784 .proc_handler = proc_dointvec,
3785 },
3786 {
3787 .procname = "gc_min_interval",
3788 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3789 .maxlen = sizeof(int),
3790 .mode = 0644,
3791 .proc_handler = proc_dointvec_jiffies,
3792 },
3793 {
3794 .procname = "gc_timeout",
3795 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3796 .maxlen = sizeof(int),
3797 .mode = 0644,
3798 .proc_handler = proc_dointvec_jiffies,
3799 },
3800 {
3801 .procname = "gc_interval",
3802 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3803 .maxlen = sizeof(int),
3804 .mode = 0644,
3805 .proc_handler = proc_dointvec_jiffies,
3806 },
3807 {
3808 .procname = "gc_elasticity",
3809 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3810 .maxlen = sizeof(int),
3811 .mode = 0644,
3812 .proc_handler = proc_dointvec,
3813 },
3814 {
3815 .procname = "mtu_expires",
3816 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3817 .maxlen = sizeof(int),
3818 .mode = 0644,
3819 .proc_handler = proc_dointvec_jiffies,
3820 },
3821 {
3822 .procname = "min_adv_mss",
3823 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3824 .maxlen = sizeof(int),
3825 .mode = 0644,
3826 .proc_handler = proc_dointvec,
3827 },
3828 {
3829 .procname = "gc_min_interval_ms",
3830 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3831 .maxlen = sizeof(int),
3832 .mode = 0644,
3833 .proc_handler = proc_dointvec_ms_jiffies,
3834 },
3835 { }
3836 };
3837
3838 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3839 {
3840 struct ctl_table *table;
3841
3842 table = kmemdup(ipv6_route_table_template,
3843 sizeof(ipv6_route_table_template),
3844 GFP_KERNEL);
3845
3846 if (table) {
3847 table[0].data = &net->ipv6.sysctl.flush_delay;
3848 table[0].extra1 = net;
3849 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3850 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3851 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3852 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3853 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3854 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3855 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3856 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3857 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3858
3859 /* Don't export sysctls to unprivileged users */
3860 if (net->user_ns != &init_user_ns)
3861 table[0].procname = NULL;
3862 }
3863
3864 return table;
3865 }
3866 #endif
3867
3868 static int __net_init ip6_route_net_init(struct net *net)
3869 {
3870 int ret = -ENOMEM;
3871
3872 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3873 sizeof(net->ipv6.ip6_dst_ops));
3874
3875 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3876 goto out_ip6_dst_ops;
3877
3878 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3879 sizeof(*net->ipv6.ip6_null_entry),
3880 GFP_KERNEL);
3881 if (!net->ipv6.ip6_null_entry)
3882 goto out_ip6_dst_entries;
3883 net->ipv6.ip6_null_entry->dst.path =
3884 (struct dst_entry *)net->ipv6.ip6_null_entry;
3885 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3886 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3887 ip6_template_metrics, true);
3888
3889 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3890 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3891 sizeof(*net->ipv6.ip6_prohibit_entry),
3892 GFP_KERNEL);
3893 if (!net->ipv6.ip6_prohibit_entry)
3894 goto out_ip6_null_entry;
3895 net->ipv6.ip6_prohibit_entry->dst.path =
3896 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3897 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3898 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3899 ip6_template_metrics, true);
3900
3901 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3902 sizeof(*net->ipv6.ip6_blk_hole_entry),
3903 GFP_KERNEL);
3904 if (!net->ipv6.ip6_blk_hole_entry)
3905 goto out_ip6_prohibit_entry;
3906 net->ipv6.ip6_blk_hole_entry->dst.path =
3907 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3908 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3909 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3910 ip6_template_metrics, true);
3911 #endif
3912
3913 net->ipv6.sysctl.flush_delay = 0;
3914 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3915 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3916 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3917 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3918 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3919 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3920 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3921
3922 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3923
3924 ret = 0;
3925 out:
3926 return ret;
3927
3928 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3929 out_ip6_prohibit_entry:
3930 kfree(net->ipv6.ip6_prohibit_entry);
3931 out_ip6_null_entry:
3932 kfree(net->ipv6.ip6_null_entry);
3933 #endif
3934 out_ip6_dst_entries:
3935 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3936 out_ip6_dst_ops:
3937 goto out;
3938 }
3939
3940 static void __net_exit ip6_route_net_exit(struct net *net)
3941 {
3942 kfree(net->ipv6.ip6_null_entry);
3943 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3944 kfree(net->ipv6.ip6_prohibit_entry);
3945 kfree(net->ipv6.ip6_blk_hole_entry);
3946 #endif
3947 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3948 }
3949
3950 static int __net_init ip6_route_net_init_late(struct net *net)
3951 {
3952 #ifdef CONFIG_PROC_FS
3953 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3954 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3955 #endif
3956 return 0;
3957 }
3958
3959 static void __net_exit ip6_route_net_exit_late(struct net *net)
3960 {
3961 #ifdef CONFIG_PROC_FS
3962 remove_proc_entry("ipv6_route", net->proc_net);
3963 remove_proc_entry("rt6_stats", net->proc_net);
3964 #endif
3965 }
3966
3967 static struct pernet_operations ip6_route_net_ops = {
3968 .init = ip6_route_net_init,
3969 .exit = ip6_route_net_exit,
3970 };
3971
3972 static int __net_init ipv6_inetpeer_init(struct net *net)
3973 {
3974 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3975
3976 if (!bp)
3977 return -ENOMEM;
3978 inet_peer_base_init(bp);
3979 net->ipv6.peers = bp;
3980 return 0;
3981 }
3982
3983 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3984 {
3985 struct inet_peer_base *bp = net->ipv6.peers;
3986
3987 net->ipv6.peers = NULL;
3988 inetpeer_invalidate_tree(bp);
3989 kfree(bp);
3990 }
3991
3992 static struct pernet_operations ipv6_inetpeer_ops = {
3993 .init = ipv6_inetpeer_init,
3994 .exit = ipv6_inetpeer_exit,
3995 };
3996
3997 static struct pernet_operations ip6_route_net_late_ops = {
3998 .init = ip6_route_net_init_late,
3999 .exit = ip6_route_net_exit_late,
4000 };
4001
4002 static struct notifier_block ip6_route_dev_notifier = {
4003 .notifier_call = ip6_route_dev_notify,
4004 .priority = 0,
4005 };
4006
4007 int __init ip6_route_init(void)
4008 {
4009 int ret;
4010 int cpu;
4011
4012 ret = -ENOMEM;
4013 ip6_dst_ops_template.kmem_cachep =
4014 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
4015 SLAB_HWCACHE_ALIGN, NULL);
4016 if (!ip6_dst_ops_template.kmem_cachep)
4017 goto out;
4018
4019 ret = dst_entries_init(&ip6_dst_blackhole_ops);
4020 if (ret)
4021 goto out_kmem_cache;
4022
4023 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
4024 if (ret)
4025 goto out_dst_entries;
4026
4027 ret = register_pernet_subsys(&ip6_route_net_ops);
4028 if (ret)
4029 goto out_register_inetpeer;
4030
4031 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
4032
4033 /* Registering of the loopback is done before this portion of code,
4034 * the loopback reference in rt6_info will not be taken, do it
4035 * manually for init_net */
4036 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
4037 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4038 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4039 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
4040 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4041 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
4042 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4043 #endif
4044 ret = fib6_init();
4045 if (ret)
4046 goto out_register_subsys;
4047
4048 ret = xfrm6_init();
4049 if (ret)
4050 goto out_fib6_init;
4051
4052 ret = fib6_rules_init();
4053 if (ret)
4054 goto xfrm6_init;
4055
4056 ret = register_pernet_subsys(&ip6_route_net_late_ops);
4057 if (ret)
4058 goto fib6_rules_init;
4059
4060 ret = -ENOBUFS;
4061 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
4062 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
4063 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
4064 goto out_register_late_subsys;
4065
4066 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
4067 if (ret)
4068 goto out_register_late_subsys;
4069
4070 for_each_possible_cpu(cpu) {
4071 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
4072
4073 INIT_LIST_HEAD(&ul->head);
4074 spin_lock_init(&ul->lock);
4075 }
4076
4077 out:
4078 return ret;
4079
4080 out_register_late_subsys:
4081 unregister_pernet_subsys(&ip6_route_net_late_ops);
4082 fib6_rules_init:
4083 fib6_rules_cleanup();
4084 xfrm6_init:
4085 xfrm6_fini();
4086 out_fib6_init:
4087 fib6_gc_cleanup();
4088 out_register_subsys:
4089 unregister_pernet_subsys(&ip6_route_net_ops);
4090 out_register_inetpeer:
4091 unregister_pernet_subsys(&ipv6_inetpeer_ops);
4092 out_dst_entries:
4093 dst_entries_destroy(&ip6_dst_blackhole_ops);
4094 out_kmem_cache:
4095 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
4096 goto out;
4097 }
4098
4099 void ip6_route_cleanup(void)
4100 {
4101 unregister_netdevice_notifier(&ip6_route_dev_notifier);
4102 unregister_pernet_subsys(&ip6_route_net_late_ops);
4103 fib6_rules_cleanup();
4104 xfrm6_fini();
4105 fib6_gc_cleanup();
4106 unregister_pernet_subsys(&ipv6_inetpeer_ops);
4107 unregister_pernet_subsys(&ip6_route_net_ops);
4108 dst_entries_destroy(&ip6_dst_blackhole_ops);
4109 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
4110 }
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