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Merge tag 'iio-for-4.13b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23...
[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 /* RTF_PCPU is an internal flag; can not be set by userspace */
1858 if (cfg->fc_flags & RTF_PCPU)
1859 goto out;
1860
1861 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1862 goto out;
1863 #ifndef CONFIG_IPV6_SUBTREES
1864 if (cfg->fc_src_len)
1865 goto out;
1866 #endif
1867 if (cfg->fc_ifindex) {
1868 err = -ENODEV;
1869 dev = dev_get_by_index(net, cfg->fc_ifindex);
1870 if (!dev)
1871 goto out;
1872 idev = in6_dev_get(dev);
1873 if (!idev)
1874 goto out;
1875 }
1876
1877 if (cfg->fc_metric == 0)
1878 cfg->fc_metric = IP6_RT_PRIO_USER;
1879
1880 err = -ENOBUFS;
1881 if (cfg->fc_nlinfo.nlh &&
1882 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1883 table = fib6_get_table(net, cfg->fc_table);
1884 if (!table) {
1885 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1886 table = fib6_new_table(net, cfg->fc_table);
1887 }
1888 } else {
1889 table = fib6_new_table(net, cfg->fc_table);
1890 }
1891
1892 if (!table)
1893 goto out;
1894
1895 rt = ip6_dst_alloc(net, NULL,
1896 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1897
1898 if (!rt) {
1899 err = -ENOMEM;
1900 goto out;
1901 }
1902
1903 if (cfg->fc_flags & RTF_EXPIRES)
1904 rt6_set_expires(rt, jiffies +
1905 clock_t_to_jiffies(cfg->fc_expires));
1906 else
1907 rt6_clean_expires(rt);
1908
1909 if (cfg->fc_protocol == RTPROT_UNSPEC)
1910 cfg->fc_protocol = RTPROT_BOOT;
1911 rt->rt6i_protocol = cfg->fc_protocol;
1912
1913 addr_type = ipv6_addr_type(&cfg->fc_dst);
1914
1915 if (addr_type & IPV6_ADDR_MULTICAST)
1916 rt->dst.input = ip6_mc_input;
1917 else if (cfg->fc_flags & RTF_LOCAL)
1918 rt->dst.input = ip6_input;
1919 else
1920 rt->dst.input = ip6_forward;
1921
1922 rt->dst.output = ip6_output;
1923
1924 if (cfg->fc_encap) {
1925 struct lwtunnel_state *lwtstate;
1926
1927 err = lwtunnel_build_state(cfg->fc_encap_type,
1928 cfg->fc_encap, AF_INET6, cfg,
1929 &lwtstate);
1930 if (err)
1931 goto out;
1932 rt->dst.lwtstate = lwtstate_get(lwtstate);
1933 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1934 rt->dst.lwtstate->orig_output = rt->dst.output;
1935 rt->dst.output = lwtunnel_output;
1936 }
1937 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1938 rt->dst.lwtstate->orig_input = rt->dst.input;
1939 rt->dst.input = lwtunnel_input;
1940 }
1941 }
1942
1943 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1944 rt->rt6i_dst.plen = cfg->fc_dst_len;
1945 if (rt->rt6i_dst.plen == 128)
1946 rt->dst.flags |= DST_HOST;
1947
1948 #ifdef CONFIG_IPV6_SUBTREES
1949 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1950 rt->rt6i_src.plen = cfg->fc_src_len;
1951 #endif
1952
1953 rt->rt6i_metric = cfg->fc_metric;
1954
1955 /* We cannot add true routes via loopback here,
1956 they would result in kernel looping; promote them to reject routes
1957 */
1958 if ((cfg->fc_flags & RTF_REJECT) ||
1959 (dev && (dev->flags & IFF_LOOPBACK) &&
1960 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1961 !(cfg->fc_flags & RTF_LOCAL))) {
1962 /* hold loopback dev/idev if we haven't done so. */
1963 if (dev != net->loopback_dev) {
1964 if (dev) {
1965 dev_put(dev);
1966 in6_dev_put(idev);
1967 }
1968 dev = net->loopback_dev;
1969 dev_hold(dev);
1970 idev = in6_dev_get(dev);
1971 if (!idev) {
1972 err = -ENODEV;
1973 goto out;
1974 }
1975 }
1976 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1977 switch (cfg->fc_type) {
1978 case RTN_BLACKHOLE:
1979 rt->dst.error = -EINVAL;
1980 rt->dst.output = dst_discard_out;
1981 rt->dst.input = dst_discard;
1982 break;
1983 case RTN_PROHIBIT:
1984 rt->dst.error = -EACCES;
1985 rt->dst.output = ip6_pkt_prohibit_out;
1986 rt->dst.input = ip6_pkt_prohibit;
1987 break;
1988 case RTN_THROW:
1989 case RTN_UNREACHABLE:
1990 default:
1991 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1992 : (cfg->fc_type == RTN_UNREACHABLE)
1993 ? -EHOSTUNREACH : -ENETUNREACH;
1994 rt->dst.output = ip6_pkt_discard_out;
1995 rt->dst.input = ip6_pkt_discard;
1996 break;
1997 }
1998 goto install_route;
1999 }
2000
2001 if (cfg->fc_flags & RTF_GATEWAY) {
2002 const struct in6_addr *gw_addr;
2003 int gwa_type;
2004
2005 gw_addr = &cfg->fc_gateway;
2006 gwa_type = ipv6_addr_type(gw_addr);
2007
2008 /* if gw_addr is local we will fail to detect this in case
2009 * address is still TENTATIVE (DAD in progress). rt6_lookup()
2010 * will return already-added prefix route via interface that
2011 * prefix route was assigned to, which might be non-loopback.
2012 */
2013 err = -EINVAL;
2014 if (ipv6_chk_addr_and_flags(net, gw_addr,
2015 gwa_type & IPV6_ADDR_LINKLOCAL ?
2016 dev : NULL, 0, 0))
2017 goto out;
2018
2019 rt->rt6i_gateway = *gw_addr;
2020
2021 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
2022 struct rt6_info *grt = NULL;
2023
2024 /* IPv6 strictly inhibits using not link-local
2025 addresses as nexthop address.
2026 Otherwise, router will not able to send redirects.
2027 It is very good, but in some (rare!) circumstances
2028 (SIT, PtP, NBMA NOARP links) it is handy to allow
2029 some exceptions. --ANK
2030 We allow IPv4-mapped nexthops to support RFC4798-type
2031 addressing
2032 */
2033 if (!(gwa_type & (IPV6_ADDR_UNICAST |
2034 IPV6_ADDR_MAPPED)))
2035 goto out;
2036
2037 if (cfg->fc_table) {
2038 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
2039
2040 if (grt) {
2041 if (grt->rt6i_flags & RTF_GATEWAY ||
2042 (dev && dev != grt->dst.dev)) {
2043 ip6_rt_put(grt);
2044 grt = NULL;
2045 }
2046 }
2047 }
2048
2049 if (!grt)
2050 grt = rt6_lookup(net, gw_addr, NULL,
2051 cfg->fc_ifindex, 1);
2052
2053 err = -EHOSTUNREACH;
2054 if (!grt)
2055 goto out;
2056 if (dev) {
2057 if (dev != grt->dst.dev) {
2058 ip6_rt_put(grt);
2059 goto out;
2060 }
2061 } else {
2062 dev = grt->dst.dev;
2063 idev = grt->rt6i_idev;
2064 dev_hold(dev);
2065 in6_dev_hold(grt->rt6i_idev);
2066 }
2067 if (!(grt->rt6i_flags & RTF_GATEWAY))
2068 err = 0;
2069 ip6_rt_put(grt);
2070
2071 if (err)
2072 goto out;
2073 }
2074 err = -EINVAL;
2075 if (!dev || (dev->flags & IFF_LOOPBACK))
2076 goto out;
2077 }
2078
2079 err = -ENODEV;
2080 if (!dev)
2081 goto out;
2082
2083 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2084 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2085 err = -EINVAL;
2086 goto out;
2087 }
2088 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2089 rt->rt6i_prefsrc.plen = 128;
2090 } else
2091 rt->rt6i_prefsrc.plen = 0;
2092
2093 rt->rt6i_flags = cfg->fc_flags;
2094
2095 install_route:
2096 rt->dst.dev = dev;
2097 rt->rt6i_idev = idev;
2098 rt->rt6i_table = table;
2099
2100 cfg->fc_nlinfo.nl_net = dev_net(dev);
2101
2102 return rt;
2103 out:
2104 if (dev)
2105 dev_put(dev);
2106 if (idev)
2107 in6_dev_put(idev);
2108 if (rt)
2109 dst_free(&rt->dst);
2110
2111 return ERR_PTR(err);
2112 }
2113
2114 int ip6_route_add(struct fib6_config *cfg)
2115 {
2116 struct mx6_config mxc = { .mx = NULL, };
2117 struct rt6_info *rt;
2118 int err;
2119
2120 rt = ip6_route_info_create(cfg);
2121 if (IS_ERR(rt)) {
2122 err = PTR_ERR(rt);
2123 rt = NULL;
2124 goto out;
2125 }
2126
2127 err = ip6_convert_metrics(&mxc, cfg);
2128 if (err)
2129 goto out;
2130
2131 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2132
2133 kfree(mxc.mx);
2134
2135 return err;
2136 out:
2137 if (rt)
2138 dst_free(&rt->dst);
2139
2140 return err;
2141 }
2142
2143 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2144 {
2145 int err;
2146 struct fib6_table *table;
2147 struct net *net = dev_net(rt->dst.dev);
2148
2149 if (rt == net->ipv6.ip6_null_entry ||
2150 rt->dst.flags & DST_NOCACHE) {
2151 err = -ENOENT;
2152 goto out;
2153 }
2154
2155 table = rt->rt6i_table;
2156 write_lock_bh(&table->tb6_lock);
2157 err = fib6_del(rt, info);
2158 write_unlock_bh(&table->tb6_lock);
2159
2160 out:
2161 ip6_rt_put(rt);
2162 return err;
2163 }
2164
2165 int ip6_del_rt(struct rt6_info *rt)
2166 {
2167 struct nl_info info = {
2168 .nl_net = dev_net(rt->dst.dev),
2169 };
2170 return __ip6_del_rt(rt, &info);
2171 }
2172
2173 static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
2174 {
2175 struct nl_info *info = &cfg->fc_nlinfo;
2176 struct net *net = info->nl_net;
2177 struct sk_buff *skb = NULL;
2178 struct fib6_table *table;
2179 int err = -ENOENT;
2180
2181 if (rt == net->ipv6.ip6_null_entry)
2182 goto out_put;
2183 table = rt->rt6i_table;
2184 write_lock_bh(&table->tb6_lock);
2185
2186 if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) {
2187 struct rt6_info *sibling, *next_sibling;
2188
2189 /* prefer to send a single notification with all hops */
2190 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
2191 if (skb) {
2192 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2193
2194 if (rt6_fill_node(net, skb, rt,
2195 NULL, NULL, 0, RTM_DELROUTE,
2196 info->portid, seq, 0) < 0) {
2197 kfree_skb(skb);
2198 skb = NULL;
2199 } else
2200 info->skip_notify = 1;
2201 }
2202
2203 list_for_each_entry_safe(sibling, next_sibling,
2204 &rt->rt6i_siblings,
2205 rt6i_siblings) {
2206 err = fib6_del(sibling, info);
2207 if (err)
2208 goto out_unlock;
2209 }
2210 }
2211
2212 err = fib6_del(rt, info);
2213 out_unlock:
2214 write_unlock_bh(&table->tb6_lock);
2215 out_put:
2216 ip6_rt_put(rt);
2217
2218 if (skb) {
2219 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2220 info->nlh, gfp_any());
2221 }
2222 return err;
2223 }
2224
2225 static int ip6_route_del(struct fib6_config *cfg)
2226 {
2227 struct fib6_table *table;
2228 struct fib6_node *fn;
2229 struct rt6_info *rt;
2230 int err = -ESRCH;
2231
2232 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2233 if (!table)
2234 return err;
2235
2236 read_lock_bh(&table->tb6_lock);
2237
2238 fn = fib6_locate(&table->tb6_root,
2239 &cfg->fc_dst, cfg->fc_dst_len,
2240 &cfg->fc_src, cfg->fc_src_len);
2241
2242 if (fn) {
2243 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2244 if ((rt->rt6i_flags & RTF_CACHE) &&
2245 !(cfg->fc_flags & RTF_CACHE))
2246 continue;
2247 if (cfg->fc_ifindex &&
2248 (!rt->dst.dev ||
2249 rt->dst.dev->ifindex != cfg->fc_ifindex))
2250 continue;
2251 if (cfg->fc_flags & RTF_GATEWAY &&
2252 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2253 continue;
2254 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2255 continue;
2256 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
2257 continue;
2258 dst_hold(&rt->dst);
2259 read_unlock_bh(&table->tb6_lock);
2260
2261 /* if gateway was specified only delete the one hop */
2262 if (cfg->fc_flags & RTF_GATEWAY)
2263 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2264
2265 return __ip6_del_rt_siblings(rt, cfg);
2266 }
2267 }
2268 read_unlock_bh(&table->tb6_lock);
2269
2270 return err;
2271 }
2272
2273 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2274 {
2275 struct netevent_redirect netevent;
2276 struct rt6_info *rt, *nrt = NULL;
2277 struct ndisc_options ndopts;
2278 struct inet6_dev *in6_dev;
2279 struct neighbour *neigh;
2280 struct rd_msg *msg;
2281 int optlen, on_link;
2282 u8 *lladdr;
2283
2284 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2285 optlen -= sizeof(*msg);
2286
2287 if (optlen < 0) {
2288 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2289 return;
2290 }
2291
2292 msg = (struct rd_msg *)icmp6_hdr(skb);
2293
2294 if (ipv6_addr_is_multicast(&msg->dest)) {
2295 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2296 return;
2297 }
2298
2299 on_link = 0;
2300 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2301 on_link = 1;
2302 } else if (ipv6_addr_type(&msg->target) !=
2303 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2304 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2305 return;
2306 }
2307
2308 in6_dev = __in6_dev_get(skb->dev);
2309 if (!in6_dev)
2310 return;
2311 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2312 return;
2313
2314 /* RFC2461 8.1:
2315 * The IP source address of the Redirect MUST be the same as the current
2316 * first-hop router for the specified ICMP Destination Address.
2317 */
2318
2319 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
2320 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2321 return;
2322 }
2323
2324 lladdr = NULL;
2325 if (ndopts.nd_opts_tgt_lladdr) {
2326 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2327 skb->dev);
2328 if (!lladdr) {
2329 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2330 return;
2331 }
2332 }
2333
2334 rt = (struct rt6_info *) dst;
2335 if (rt->rt6i_flags & RTF_REJECT) {
2336 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2337 return;
2338 }
2339
2340 /* Redirect received -> path was valid.
2341 * Look, redirects are sent only in response to data packets,
2342 * so that this nexthop apparently is reachable. --ANK
2343 */
2344 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
2345
2346 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2347 if (!neigh)
2348 return;
2349
2350 /*
2351 * We have finally decided to accept it.
2352 */
2353
2354 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
2355 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2356 NEIGH_UPDATE_F_OVERRIDE|
2357 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2358 NEIGH_UPDATE_F_ISROUTER)),
2359 NDISC_REDIRECT, &ndopts);
2360
2361 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2362 if (!nrt)
2363 goto out;
2364
2365 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2366 if (on_link)
2367 nrt->rt6i_flags &= ~RTF_GATEWAY;
2368
2369 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2370
2371 if (ip6_ins_rt(nrt))
2372 goto out;
2373
2374 netevent.old = &rt->dst;
2375 netevent.new = &nrt->dst;
2376 netevent.daddr = &msg->dest;
2377 netevent.neigh = neigh;
2378 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2379
2380 if (rt->rt6i_flags & RTF_CACHE) {
2381 rt = (struct rt6_info *) dst_clone(&rt->dst);
2382 ip6_del_rt(rt);
2383 }
2384
2385 out:
2386 neigh_release(neigh);
2387 }
2388
2389 /*
2390 * Misc support functions
2391 */
2392
2393 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2394 {
2395 BUG_ON(from->dst.from);
2396
2397 rt->rt6i_flags &= ~RTF_EXPIRES;
2398 dst_hold(&from->dst);
2399 rt->dst.from = &from->dst;
2400 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2401 }
2402
2403 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2404 {
2405 rt->dst.input = ort->dst.input;
2406 rt->dst.output = ort->dst.output;
2407 rt->rt6i_dst = ort->rt6i_dst;
2408 rt->dst.error = ort->dst.error;
2409 rt->rt6i_idev = ort->rt6i_idev;
2410 if (rt->rt6i_idev)
2411 in6_dev_hold(rt->rt6i_idev);
2412 rt->dst.lastuse = jiffies;
2413 rt->rt6i_gateway = ort->rt6i_gateway;
2414 rt->rt6i_flags = ort->rt6i_flags;
2415 rt6_set_from(rt, ort);
2416 rt->rt6i_metric = ort->rt6i_metric;
2417 #ifdef CONFIG_IPV6_SUBTREES
2418 rt->rt6i_src = ort->rt6i_src;
2419 #endif
2420 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2421 rt->rt6i_table = ort->rt6i_table;
2422 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2423 }
2424
2425 #ifdef CONFIG_IPV6_ROUTE_INFO
2426 static struct rt6_info *rt6_get_route_info(struct net *net,
2427 const struct in6_addr *prefix, int prefixlen,
2428 const struct in6_addr *gwaddr,
2429 struct net_device *dev)
2430 {
2431 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
2432 int ifindex = dev->ifindex;
2433 struct fib6_node *fn;
2434 struct rt6_info *rt = NULL;
2435 struct fib6_table *table;
2436
2437 table = fib6_get_table(net, tb_id);
2438 if (!table)
2439 return NULL;
2440
2441 read_lock_bh(&table->tb6_lock);
2442 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2443 if (!fn)
2444 goto out;
2445
2446 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2447 if (rt->dst.dev->ifindex != ifindex)
2448 continue;
2449 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2450 continue;
2451 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2452 continue;
2453 dst_hold(&rt->dst);
2454 break;
2455 }
2456 out:
2457 read_unlock_bh(&table->tb6_lock);
2458 return rt;
2459 }
2460
2461 static struct rt6_info *rt6_add_route_info(struct net *net,
2462 const struct in6_addr *prefix, int prefixlen,
2463 const struct in6_addr *gwaddr,
2464 struct net_device *dev,
2465 unsigned int pref)
2466 {
2467 struct fib6_config cfg = {
2468 .fc_metric = IP6_RT_PRIO_USER,
2469 .fc_ifindex = dev->ifindex,
2470 .fc_dst_len = prefixlen,
2471 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2472 RTF_UP | RTF_PREF(pref),
2473 .fc_nlinfo.portid = 0,
2474 .fc_nlinfo.nlh = NULL,
2475 .fc_nlinfo.nl_net = net,
2476 };
2477
2478 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
2479 cfg.fc_dst = *prefix;
2480 cfg.fc_gateway = *gwaddr;
2481
2482 /* We should treat it as a default route if prefix length is 0. */
2483 if (!prefixlen)
2484 cfg.fc_flags |= RTF_DEFAULT;
2485
2486 ip6_route_add(&cfg);
2487
2488 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
2489 }
2490 #endif
2491
2492 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2493 {
2494 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
2495 struct rt6_info *rt;
2496 struct fib6_table *table;
2497
2498 table = fib6_get_table(dev_net(dev), tb_id);
2499 if (!table)
2500 return NULL;
2501
2502 read_lock_bh(&table->tb6_lock);
2503 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2504 if (dev == rt->dst.dev &&
2505 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2506 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2507 break;
2508 }
2509 if (rt)
2510 dst_hold(&rt->dst);
2511 read_unlock_bh(&table->tb6_lock);
2512 return rt;
2513 }
2514
2515 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2516 struct net_device *dev,
2517 unsigned int pref)
2518 {
2519 struct fib6_config cfg = {
2520 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2521 .fc_metric = IP6_RT_PRIO_USER,
2522 .fc_ifindex = dev->ifindex,
2523 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2524 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2525 .fc_nlinfo.portid = 0,
2526 .fc_nlinfo.nlh = NULL,
2527 .fc_nlinfo.nl_net = dev_net(dev),
2528 };
2529
2530 cfg.fc_gateway = *gwaddr;
2531
2532 if (!ip6_route_add(&cfg)) {
2533 struct fib6_table *table;
2534
2535 table = fib6_get_table(dev_net(dev), cfg.fc_table);
2536 if (table)
2537 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
2538 }
2539
2540 return rt6_get_dflt_router(gwaddr, dev);
2541 }
2542
2543 static void __rt6_purge_dflt_routers(struct fib6_table *table)
2544 {
2545 struct rt6_info *rt;
2546
2547 restart:
2548 read_lock_bh(&table->tb6_lock);
2549 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2550 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2551 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2552 dst_hold(&rt->dst);
2553 read_unlock_bh(&table->tb6_lock);
2554 ip6_del_rt(rt);
2555 goto restart;
2556 }
2557 }
2558 read_unlock_bh(&table->tb6_lock);
2559
2560 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
2561 }
2562
2563 void rt6_purge_dflt_routers(struct net *net)
2564 {
2565 struct fib6_table *table;
2566 struct hlist_head *head;
2567 unsigned int h;
2568
2569 rcu_read_lock();
2570
2571 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
2572 head = &net->ipv6.fib_table_hash[h];
2573 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
2574 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
2575 __rt6_purge_dflt_routers(table);
2576 }
2577 }
2578
2579 rcu_read_unlock();
2580 }
2581
2582 static void rtmsg_to_fib6_config(struct net *net,
2583 struct in6_rtmsg *rtmsg,
2584 struct fib6_config *cfg)
2585 {
2586 memset(cfg, 0, sizeof(*cfg));
2587
2588 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2589 : RT6_TABLE_MAIN;
2590 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2591 cfg->fc_metric = rtmsg->rtmsg_metric;
2592 cfg->fc_expires = rtmsg->rtmsg_info;
2593 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2594 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2595 cfg->fc_flags = rtmsg->rtmsg_flags;
2596
2597 cfg->fc_nlinfo.nl_net = net;
2598
2599 cfg->fc_dst = rtmsg->rtmsg_dst;
2600 cfg->fc_src = rtmsg->rtmsg_src;
2601 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2602 }
2603
2604 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2605 {
2606 struct fib6_config cfg;
2607 struct in6_rtmsg rtmsg;
2608 int err;
2609
2610 switch (cmd) {
2611 case SIOCADDRT: /* Add a route */
2612 case SIOCDELRT: /* Delete a route */
2613 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2614 return -EPERM;
2615 err = copy_from_user(&rtmsg, arg,
2616 sizeof(struct in6_rtmsg));
2617 if (err)
2618 return -EFAULT;
2619
2620 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2621
2622 rtnl_lock();
2623 switch (cmd) {
2624 case SIOCADDRT:
2625 err = ip6_route_add(&cfg);
2626 break;
2627 case SIOCDELRT:
2628 err = ip6_route_del(&cfg);
2629 break;
2630 default:
2631 err = -EINVAL;
2632 }
2633 rtnl_unlock();
2634
2635 return err;
2636 }
2637
2638 return -EINVAL;
2639 }
2640
2641 /*
2642 * Drop the packet on the floor
2643 */
2644
2645 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2646 {
2647 int type;
2648 struct dst_entry *dst = skb_dst(skb);
2649 switch (ipstats_mib_noroutes) {
2650 case IPSTATS_MIB_INNOROUTES:
2651 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2652 if (type == IPV6_ADDR_ANY) {
2653 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2654 IPSTATS_MIB_INADDRERRORS);
2655 break;
2656 }
2657 /* FALLTHROUGH */
2658 case IPSTATS_MIB_OUTNOROUTES:
2659 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2660 ipstats_mib_noroutes);
2661 break;
2662 }
2663 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2664 kfree_skb(skb);
2665 return 0;
2666 }
2667
2668 static int ip6_pkt_discard(struct sk_buff *skb)
2669 {
2670 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2671 }
2672
2673 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2674 {
2675 skb->dev = skb_dst(skb)->dev;
2676 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2677 }
2678
2679 static int ip6_pkt_prohibit(struct sk_buff *skb)
2680 {
2681 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2682 }
2683
2684 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2685 {
2686 skb->dev = skb_dst(skb)->dev;
2687 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2688 }
2689
2690 /*
2691 * Allocate a dst for local (unicast / anycast) address.
2692 */
2693
2694 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2695 const struct in6_addr *addr,
2696 bool anycast)
2697 {
2698 u32 tb_id;
2699 struct net *net = dev_net(idev->dev);
2700 struct net_device *dev = net->loopback_dev;
2701 struct rt6_info *rt;
2702
2703 /* use L3 Master device as loopback for host routes if device
2704 * is enslaved and address is not link local or multicast
2705 */
2706 if (!rt6_need_strict(addr))
2707 dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
2708
2709 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
2710 if (!rt)
2711 return ERR_PTR(-ENOMEM);
2712
2713 in6_dev_hold(idev);
2714
2715 rt->dst.flags |= DST_HOST;
2716 rt->dst.input = ip6_input;
2717 rt->dst.output = ip6_output;
2718 rt->rt6i_idev = idev;
2719
2720 rt->rt6i_protocol = RTPROT_KERNEL;
2721 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2722 if (anycast)
2723 rt->rt6i_flags |= RTF_ANYCAST;
2724 else
2725 rt->rt6i_flags |= RTF_LOCAL;
2726
2727 rt->rt6i_gateway = *addr;
2728 rt->rt6i_dst.addr = *addr;
2729 rt->rt6i_dst.plen = 128;
2730 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2731 rt->rt6i_table = fib6_get_table(net, tb_id);
2732 rt->dst.flags |= DST_NOCACHE;
2733
2734 atomic_set(&rt->dst.__refcnt, 1);
2735
2736 return rt;
2737 }
2738
2739 /* remove deleted ip from prefsrc entries */
2740 struct arg_dev_net_ip {
2741 struct net_device *dev;
2742 struct net *net;
2743 struct in6_addr *addr;
2744 };
2745
2746 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2747 {
2748 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2749 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2750 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2751
2752 if (((void *)rt->dst.dev == dev || !dev) &&
2753 rt != net->ipv6.ip6_null_entry &&
2754 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2755 /* remove prefsrc entry */
2756 rt->rt6i_prefsrc.plen = 0;
2757 }
2758 return 0;
2759 }
2760
2761 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2762 {
2763 struct net *net = dev_net(ifp->idev->dev);
2764 struct arg_dev_net_ip adni = {
2765 .dev = ifp->idev->dev,
2766 .net = net,
2767 .addr = &ifp->addr,
2768 };
2769 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2770 }
2771
2772 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2773 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2774
2775 /* Remove routers and update dst entries when gateway turn into host. */
2776 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2777 {
2778 struct in6_addr *gateway = (struct in6_addr *)arg;
2779
2780 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2781 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2782 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2783 return -1;
2784 }
2785 return 0;
2786 }
2787
2788 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2789 {
2790 fib6_clean_all(net, fib6_clean_tohost, gateway);
2791 }
2792
2793 struct arg_dev_net {
2794 struct net_device *dev;
2795 struct net *net;
2796 };
2797
2798 /* called with write lock held for table with rt */
2799 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2800 {
2801 const struct arg_dev_net *adn = arg;
2802 const struct net_device *dev = adn->dev;
2803
2804 if ((rt->dst.dev == dev || !dev) &&
2805 rt != adn->net->ipv6.ip6_null_entry &&
2806 (rt->rt6i_nsiblings == 0 ||
2807 (dev && netdev_unregistering(dev)) ||
2808 !rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
2809 return -1;
2810
2811 return 0;
2812 }
2813
2814 void rt6_ifdown(struct net *net, struct net_device *dev)
2815 {
2816 struct arg_dev_net adn = {
2817 .dev = dev,
2818 .net = net,
2819 };
2820
2821 fib6_clean_all(net, fib6_ifdown, &adn);
2822 icmp6_clean_all(fib6_ifdown, &adn);
2823 if (dev)
2824 rt6_uncached_list_flush_dev(net, dev);
2825 }
2826
2827 struct rt6_mtu_change_arg {
2828 struct net_device *dev;
2829 unsigned int mtu;
2830 };
2831
2832 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2833 {
2834 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2835 struct inet6_dev *idev;
2836
2837 /* In IPv6 pmtu discovery is not optional,
2838 so that RTAX_MTU lock cannot disable it.
2839 We still use this lock to block changes
2840 caused by addrconf/ndisc.
2841 */
2842
2843 idev = __in6_dev_get(arg->dev);
2844 if (!idev)
2845 return 0;
2846
2847 /* For administrative MTU increase, there is no way to discover
2848 IPv6 PMTU increase, so PMTU increase should be updated here.
2849 Since RFC 1981 doesn't include administrative MTU increase
2850 update PMTU increase is a MUST. (i.e. jumbo frame)
2851 */
2852 /*
2853 If new MTU is less than route PMTU, this new MTU will be the
2854 lowest MTU in the path, update the route PMTU to reflect PMTU
2855 decreases; if new MTU is greater than route PMTU, and the
2856 old MTU is the lowest MTU in the path, update the route PMTU
2857 to reflect the increase. In this case if the other nodes' MTU
2858 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2859 PMTU discovery.
2860 */
2861 if (rt->dst.dev == arg->dev &&
2862 dst_metric_raw(&rt->dst, RTAX_MTU) &&
2863 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2864 if (rt->rt6i_flags & RTF_CACHE) {
2865 /* For RTF_CACHE with rt6i_pmtu == 0
2866 * (i.e. a redirected route),
2867 * the metrics of its rt->dst.from has already
2868 * been updated.
2869 */
2870 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2871 rt->rt6i_pmtu = arg->mtu;
2872 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2873 (dst_mtu(&rt->dst) < arg->mtu &&
2874 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2875 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2876 }
2877 }
2878 return 0;
2879 }
2880
2881 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2882 {
2883 struct rt6_mtu_change_arg arg = {
2884 .dev = dev,
2885 .mtu = mtu,
2886 };
2887
2888 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2889 }
2890
2891 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2892 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2893 [RTA_OIF] = { .type = NLA_U32 },
2894 [RTA_IIF] = { .type = NLA_U32 },
2895 [RTA_PRIORITY] = { .type = NLA_U32 },
2896 [RTA_METRICS] = { .type = NLA_NESTED },
2897 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2898 [RTA_PREF] = { .type = NLA_U8 },
2899 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2900 [RTA_ENCAP] = { .type = NLA_NESTED },
2901 [RTA_EXPIRES] = { .type = NLA_U32 },
2902 [RTA_UID] = { .type = NLA_U32 },
2903 [RTA_MARK] = { .type = NLA_U32 },
2904 };
2905
2906 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2907 struct fib6_config *cfg)
2908 {
2909 struct rtmsg *rtm;
2910 struct nlattr *tb[RTA_MAX+1];
2911 unsigned int pref;
2912 int err;
2913
2914 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
2915 NULL);
2916 if (err < 0)
2917 goto errout;
2918
2919 err = -EINVAL;
2920 rtm = nlmsg_data(nlh);
2921 memset(cfg, 0, sizeof(*cfg));
2922
2923 cfg->fc_table = rtm->rtm_table;
2924 cfg->fc_dst_len = rtm->rtm_dst_len;
2925 cfg->fc_src_len = rtm->rtm_src_len;
2926 cfg->fc_flags = RTF_UP;
2927 cfg->fc_protocol = rtm->rtm_protocol;
2928 cfg->fc_type = rtm->rtm_type;
2929
2930 if (rtm->rtm_type == RTN_UNREACHABLE ||
2931 rtm->rtm_type == RTN_BLACKHOLE ||
2932 rtm->rtm_type == RTN_PROHIBIT ||
2933 rtm->rtm_type == RTN_THROW)
2934 cfg->fc_flags |= RTF_REJECT;
2935
2936 if (rtm->rtm_type == RTN_LOCAL)
2937 cfg->fc_flags |= RTF_LOCAL;
2938
2939 if (rtm->rtm_flags & RTM_F_CLONED)
2940 cfg->fc_flags |= RTF_CACHE;
2941
2942 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2943 cfg->fc_nlinfo.nlh = nlh;
2944 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2945
2946 if (tb[RTA_GATEWAY]) {
2947 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2948 cfg->fc_flags |= RTF_GATEWAY;
2949 }
2950
2951 if (tb[RTA_DST]) {
2952 int plen = (rtm->rtm_dst_len + 7) >> 3;
2953
2954 if (nla_len(tb[RTA_DST]) < plen)
2955 goto errout;
2956
2957 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2958 }
2959
2960 if (tb[RTA_SRC]) {
2961 int plen = (rtm->rtm_src_len + 7) >> 3;
2962
2963 if (nla_len(tb[RTA_SRC]) < plen)
2964 goto errout;
2965
2966 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2967 }
2968
2969 if (tb[RTA_PREFSRC])
2970 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2971
2972 if (tb[RTA_OIF])
2973 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2974
2975 if (tb[RTA_PRIORITY])
2976 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2977
2978 if (tb[RTA_METRICS]) {
2979 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2980 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2981 }
2982
2983 if (tb[RTA_TABLE])
2984 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2985
2986 if (tb[RTA_MULTIPATH]) {
2987 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2988 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2989
2990 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
2991 cfg->fc_mp_len);
2992 if (err < 0)
2993 goto errout;
2994 }
2995
2996 if (tb[RTA_PREF]) {
2997 pref = nla_get_u8(tb[RTA_PREF]);
2998 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2999 pref != ICMPV6_ROUTER_PREF_HIGH)
3000 pref = ICMPV6_ROUTER_PREF_MEDIUM;
3001 cfg->fc_flags |= RTF_PREF(pref);
3002 }
3003
3004 if (tb[RTA_ENCAP])
3005 cfg->fc_encap = tb[RTA_ENCAP];
3006
3007 if (tb[RTA_ENCAP_TYPE]) {
3008 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
3009
3010 err = lwtunnel_valid_encap_type(cfg->fc_encap_type);
3011 if (err < 0)
3012 goto errout;
3013 }
3014
3015 if (tb[RTA_EXPIRES]) {
3016 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
3017
3018 if (addrconf_finite_timeout(timeout)) {
3019 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
3020 cfg->fc_flags |= RTF_EXPIRES;
3021 }
3022 }
3023
3024 err = 0;
3025 errout:
3026 return err;
3027 }
3028
3029 struct rt6_nh {
3030 struct rt6_info *rt6_info;
3031 struct fib6_config r_cfg;
3032 struct mx6_config mxc;
3033 struct list_head next;
3034 };
3035
3036 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
3037 {
3038 struct rt6_nh *nh;
3039
3040 list_for_each_entry(nh, rt6_nh_list, next) {
3041 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n",
3042 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
3043 nh->r_cfg.fc_ifindex);
3044 }
3045 }
3046
3047 static int ip6_route_info_append(struct list_head *rt6_nh_list,
3048 struct rt6_info *rt, struct fib6_config *r_cfg)
3049 {
3050 struct rt6_nh *nh;
3051 struct rt6_info *rtnh;
3052 int err = -EEXIST;
3053
3054 list_for_each_entry(nh, rt6_nh_list, next) {
3055 /* check if rt6_info already exists */
3056 rtnh = nh->rt6_info;
3057
3058 if (rtnh->dst.dev == rt->dst.dev &&
3059 rtnh->rt6i_idev == rt->rt6i_idev &&
3060 ipv6_addr_equal(&rtnh->rt6i_gateway,
3061 &rt->rt6i_gateway))
3062 return err;
3063 }
3064
3065 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
3066 if (!nh)
3067 return -ENOMEM;
3068 nh->rt6_info = rt;
3069 err = ip6_convert_metrics(&nh->mxc, r_cfg);
3070 if (err) {
3071 kfree(nh);
3072 return err;
3073 }
3074 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
3075 list_add_tail(&nh->next, rt6_nh_list);
3076
3077 return 0;
3078 }
3079
3080 static void ip6_route_mpath_notify(struct rt6_info *rt,
3081 struct rt6_info *rt_last,
3082 struct nl_info *info,
3083 __u16 nlflags)
3084 {
3085 /* if this is an APPEND route, then rt points to the first route
3086 * inserted and rt_last points to last route inserted. Userspace
3087 * wants a consistent dump of the route which starts at the first
3088 * nexthop. Since sibling routes are always added at the end of
3089 * the list, find the first sibling of the last route appended
3090 */
3091 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) {
3092 rt = list_first_entry(&rt_last->rt6i_siblings,
3093 struct rt6_info,
3094 rt6i_siblings);
3095 }
3096
3097 if (rt)
3098 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
3099 }
3100
3101 static int ip6_route_multipath_add(struct fib6_config *cfg)
3102 {
3103 struct rt6_info *rt_notif = NULL, *rt_last = NULL;
3104 struct nl_info *info = &cfg->fc_nlinfo;
3105 struct fib6_config r_cfg;
3106 struct rtnexthop *rtnh;
3107 struct rt6_info *rt;
3108 struct rt6_nh *err_nh;
3109 struct rt6_nh *nh, *nh_safe;
3110 __u16 nlflags;
3111 int remaining;
3112 int attrlen;
3113 int err = 1;
3114 int nhn = 0;
3115 int replace = (cfg->fc_nlinfo.nlh &&
3116 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
3117 LIST_HEAD(rt6_nh_list);
3118
3119 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
3120 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
3121 nlflags |= NLM_F_APPEND;
3122
3123 remaining = cfg->fc_mp_len;
3124 rtnh = (struct rtnexthop *)cfg->fc_mp;
3125
3126 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
3127 * rt6_info structs per nexthop
3128 */
3129 while (rtnh_ok(rtnh, remaining)) {
3130 memcpy(&r_cfg, cfg, sizeof(*cfg));
3131 if (rtnh->rtnh_ifindex)
3132 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3133
3134 attrlen = rtnh_attrlen(rtnh);
3135 if (attrlen > 0) {
3136 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3137
3138 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3139 if (nla) {
3140 r_cfg.fc_gateway = nla_get_in6_addr(nla);
3141 r_cfg.fc_flags |= RTF_GATEWAY;
3142 }
3143 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
3144 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
3145 if (nla)
3146 r_cfg.fc_encap_type = nla_get_u16(nla);
3147 }
3148
3149 rt = ip6_route_info_create(&r_cfg);
3150 if (IS_ERR(rt)) {
3151 err = PTR_ERR(rt);
3152 rt = NULL;
3153 goto cleanup;
3154 }
3155
3156 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
3157 if (err) {
3158 dst_free(&rt->dst);
3159 goto cleanup;
3160 }
3161
3162 rtnh = rtnh_next(rtnh, &remaining);
3163 }
3164
3165 /* for add and replace send one notification with all nexthops.
3166 * Skip the notification in fib6_add_rt2node and send one with
3167 * the full route when done
3168 */
3169 info->skip_notify = 1;
3170
3171 err_nh = NULL;
3172 list_for_each_entry(nh, &rt6_nh_list, next) {
3173 rt_last = nh->rt6_info;
3174 err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc);
3175 /* save reference to first route for notification */
3176 if (!rt_notif && !err)
3177 rt_notif = nh->rt6_info;
3178
3179 /* nh->rt6_info is used or freed at this point, reset to NULL*/
3180 nh->rt6_info = NULL;
3181 if (err) {
3182 if (replace && nhn)
3183 ip6_print_replace_route_err(&rt6_nh_list);
3184 err_nh = nh;
3185 goto add_errout;
3186 }
3187
3188 /* Because each route is added like a single route we remove
3189 * these flags after the first nexthop: if there is a collision,
3190 * we have already failed to add the first nexthop:
3191 * fib6_add_rt2node() has rejected it; when replacing, old
3192 * nexthops have been replaced by first new, the rest should
3193 * be added to it.
3194 */
3195 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3196 NLM_F_REPLACE);
3197 nhn++;
3198 }
3199
3200 /* success ... tell user about new route */
3201 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
3202 goto cleanup;
3203
3204 add_errout:
3205 /* send notification for routes that were added so that
3206 * the delete notifications sent by ip6_route_del are
3207 * coherent
3208 */
3209 if (rt_notif)
3210 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
3211
3212 /* Delete routes that were already added */
3213 list_for_each_entry(nh, &rt6_nh_list, next) {
3214 if (err_nh == nh)
3215 break;
3216 ip6_route_del(&nh->r_cfg);
3217 }
3218
3219 cleanup:
3220 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3221 if (nh->rt6_info)
3222 dst_free(&nh->rt6_info->dst);
3223 kfree(nh->mxc.mx);
3224 list_del(&nh->next);
3225 kfree(nh);
3226 }
3227
3228 return err;
3229 }
3230
3231 static int ip6_route_multipath_del(struct fib6_config *cfg)
3232 {
3233 struct fib6_config r_cfg;
3234 struct rtnexthop *rtnh;
3235 int remaining;
3236 int attrlen;
3237 int err = 1, last_err = 0;
3238
3239 remaining = cfg->fc_mp_len;
3240 rtnh = (struct rtnexthop *)cfg->fc_mp;
3241
3242 /* Parse a Multipath Entry */
3243 while (rtnh_ok(rtnh, remaining)) {
3244 memcpy(&r_cfg, cfg, sizeof(*cfg));
3245 if (rtnh->rtnh_ifindex)
3246 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3247
3248 attrlen = rtnh_attrlen(rtnh);
3249 if (attrlen > 0) {
3250 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3251
3252 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3253 if (nla) {
3254 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3255 r_cfg.fc_flags |= RTF_GATEWAY;
3256 }
3257 }
3258 err = ip6_route_del(&r_cfg);
3259 if (err)
3260 last_err = err;
3261
3262 rtnh = rtnh_next(rtnh, &remaining);
3263 }
3264
3265 return last_err;
3266 }
3267
3268 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
3269 struct netlink_ext_ack *extack)
3270 {
3271 struct fib6_config cfg;
3272 int err;
3273
3274 err = rtm_to_fib6_config(skb, nlh, &cfg);
3275 if (err < 0)
3276 return err;
3277
3278 if (cfg.fc_mp)
3279 return ip6_route_multipath_del(&cfg);
3280 else {
3281 cfg.fc_delete_all_nh = 1;
3282 return ip6_route_del(&cfg);
3283 }
3284 }
3285
3286 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
3287 struct netlink_ext_ack *extack)
3288 {
3289 struct fib6_config cfg;
3290 int err;
3291
3292 err = rtm_to_fib6_config(skb, nlh, &cfg);
3293 if (err < 0)
3294 return err;
3295
3296 if (cfg.fc_mp)
3297 return ip6_route_multipath_add(&cfg);
3298 else
3299 return ip6_route_add(&cfg);
3300 }
3301
3302 static size_t rt6_nlmsg_size(struct rt6_info *rt)
3303 {
3304 int nexthop_len = 0;
3305
3306 if (rt->rt6i_nsiblings) {
3307 nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
3308 + NLA_ALIGN(sizeof(struct rtnexthop))
3309 + nla_total_size(16) /* RTA_GATEWAY */
3310 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3311
3312 nexthop_len *= rt->rt6i_nsiblings;
3313 }
3314
3315 return NLMSG_ALIGN(sizeof(struct rtmsg))
3316 + nla_total_size(16) /* RTA_SRC */
3317 + nla_total_size(16) /* RTA_DST */
3318 + nla_total_size(16) /* RTA_GATEWAY */
3319 + nla_total_size(16) /* RTA_PREFSRC */
3320 + nla_total_size(4) /* RTA_TABLE */
3321 + nla_total_size(4) /* RTA_IIF */
3322 + nla_total_size(4) /* RTA_OIF */
3323 + nla_total_size(4) /* RTA_PRIORITY */
3324 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3325 + nla_total_size(sizeof(struct rta_cacheinfo))
3326 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3327 + nla_total_size(1) /* RTA_PREF */
3328 + lwtunnel_get_encap_size(rt->dst.lwtstate)
3329 + nexthop_len;
3330 }
3331
3332 static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
3333 unsigned int *flags, bool skip_oif)
3334 {
3335 if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) {
3336 *flags |= RTNH_F_LINKDOWN;
3337 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3338 *flags |= RTNH_F_DEAD;
3339 }
3340
3341 if (rt->rt6i_flags & RTF_GATEWAY) {
3342 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3343 goto nla_put_failure;
3344 }
3345
3346 /* not needed for multipath encoding b/c it has a rtnexthop struct */
3347 if (!skip_oif && rt->dst.dev &&
3348 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3349 goto nla_put_failure;
3350
3351 if (rt->dst.lwtstate &&
3352 lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
3353 goto nla_put_failure;
3354
3355 return 0;
3356
3357 nla_put_failure:
3358 return -EMSGSIZE;
3359 }
3360
3361 /* add multipath next hop */
3362 static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
3363 {
3364 struct rtnexthop *rtnh;
3365 unsigned int flags = 0;
3366
3367 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
3368 if (!rtnh)
3369 goto nla_put_failure;
3370
3371 rtnh->rtnh_hops = 0;
3372 rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0;
3373
3374 if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
3375 goto nla_put_failure;
3376
3377 rtnh->rtnh_flags = flags;
3378
3379 /* length of rtnetlink header + attributes */
3380 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
3381
3382 return 0;
3383
3384 nla_put_failure:
3385 return -EMSGSIZE;
3386 }
3387
3388 static int rt6_fill_node(struct net *net,
3389 struct sk_buff *skb, struct rt6_info *rt,
3390 struct in6_addr *dst, struct in6_addr *src,
3391 int iif, int type, u32 portid, u32 seq,
3392 unsigned int flags)
3393 {
3394 u32 metrics[RTAX_MAX];
3395 struct rtmsg *rtm;
3396 struct nlmsghdr *nlh;
3397 long expires;
3398 u32 table;
3399
3400 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3401 if (!nlh)
3402 return -EMSGSIZE;
3403
3404 rtm = nlmsg_data(nlh);
3405 rtm->rtm_family = AF_INET6;
3406 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3407 rtm->rtm_src_len = rt->rt6i_src.plen;
3408 rtm->rtm_tos = 0;
3409 if (rt->rt6i_table)
3410 table = rt->rt6i_table->tb6_id;
3411 else
3412 table = RT6_TABLE_UNSPEC;
3413 rtm->rtm_table = table;
3414 if (nla_put_u32(skb, RTA_TABLE, table))
3415 goto nla_put_failure;
3416 if (rt->rt6i_flags & RTF_REJECT) {
3417 switch (rt->dst.error) {
3418 case -EINVAL:
3419 rtm->rtm_type = RTN_BLACKHOLE;
3420 break;
3421 case -EACCES:
3422 rtm->rtm_type = RTN_PROHIBIT;
3423 break;
3424 case -EAGAIN:
3425 rtm->rtm_type = RTN_THROW;
3426 break;
3427 default:
3428 rtm->rtm_type = RTN_UNREACHABLE;
3429 break;
3430 }
3431 }
3432 else if (rt->rt6i_flags & RTF_LOCAL)
3433 rtm->rtm_type = RTN_LOCAL;
3434 else if (rt->rt6i_flags & RTF_ANYCAST)
3435 rtm->rtm_type = RTN_ANYCAST;
3436 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3437 rtm->rtm_type = RTN_LOCAL;
3438 else
3439 rtm->rtm_type = RTN_UNICAST;
3440 rtm->rtm_flags = 0;
3441 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3442 rtm->rtm_protocol = rt->rt6i_protocol;
3443 if (rt->rt6i_flags & RTF_DYNAMIC)
3444 rtm->rtm_protocol = RTPROT_REDIRECT;
3445 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3446 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3447 rtm->rtm_protocol = RTPROT_RA;
3448 else
3449 rtm->rtm_protocol = RTPROT_KERNEL;
3450 }
3451
3452 if (rt->rt6i_flags & RTF_CACHE)
3453 rtm->rtm_flags |= RTM_F_CLONED;
3454
3455 if (dst) {
3456 if (nla_put_in6_addr(skb, RTA_DST, dst))
3457 goto nla_put_failure;
3458 rtm->rtm_dst_len = 128;
3459 } else if (rtm->rtm_dst_len)
3460 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3461 goto nla_put_failure;
3462 #ifdef CONFIG_IPV6_SUBTREES
3463 if (src) {
3464 if (nla_put_in6_addr(skb, RTA_SRC, src))
3465 goto nla_put_failure;
3466 rtm->rtm_src_len = 128;
3467 } else if (rtm->rtm_src_len &&
3468 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3469 goto nla_put_failure;
3470 #endif
3471 if (iif) {
3472 #ifdef CONFIG_IPV6_MROUTE
3473 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3474 int err = ip6mr_get_route(net, skb, rtm, portid);
3475
3476 if (err == 0)
3477 return 0;
3478 if (err < 0)
3479 goto nla_put_failure;
3480 } else
3481 #endif
3482 if (nla_put_u32(skb, RTA_IIF, iif))
3483 goto nla_put_failure;
3484 } else if (dst) {
3485 struct in6_addr saddr_buf;
3486 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3487 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3488 goto nla_put_failure;
3489 }
3490
3491 if (rt->rt6i_prefsrc.plen) {
3492 struct in6_addr saddr_buf;
3493 saddr_buf = rt->rt6i_prefsrc.addr;
3494 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3495 goto nla_put_failure;
3496 }
3497
3498 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3499 if (rt->rt6i_pmtu)
3500 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3501 if (rtnetlink_put_metrics(skb, metrics) < 0)
3502 goto nla_put_failure;
3503
3504 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3505 goto nla_put_failure;
3506
3507 /* For multipath routes, walk the siblings list and add
3508 * each as a nexthop within RTA_MULTIPATH.
3509 */
3510 if (rt->rt6i_nsiblings) {
3511 struct rt6_info *sibling, *next_sibling;
3512 struct nlattr *mp;
3513
3514 mp = nla_nest_start(skb, RTA_MULTIPATH);
3515 if (!mp)
3516 goto nla_put_failure;
3517
3518 if (rt6_add_nexthop(skb, rt) < 0)
3519 goto nla_put_failure;
3520
3521 list_for_each_entry_safe(sibling, next_sibling,
3522 &rt->rt6i_siblings, rt6i_siblings) {
3523 if (rt6_add_nexthop(skb, sibling) < 0)
3524 goto nla_put_failure;
3525 }
3526
3527 nla_nest_end(skb, mp);
3528 } else {
3529 if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
3530 goto nla_put_failure;
3531 }
3532
3533 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3534
3535 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3536 goto nla_put_failure;
3537
3538 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3539 goto nla_put_failure;
3540
3541
3542 nlmsg_end(skb, nlh);
3543 return 0;
3544
3545 nla_put_failure:
3546 nlmsg_cancel(skb, nlh);
3547 return -EMSGSIZE;
3548 }
3549
3550 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3551 {
3552 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3553 struct net *net = arg->net;
3554
3555 if (rt == net->ipv6.ip6_null_entry)
3556 return 0;
3557
3558 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3559 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3560
3561 /* user wants prefix routes only */
3562 if (rtm->rtm_flags & RTM_F_PREFIX &&
3563 !(rt->rt6i_flags & RTF_PREFIX_RT)) {
3564 /* success since this is not a prefix route */
3565 return 1;
3566 }
3567 }
3568
3569 return rt6_fill_node(net,
3570 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3571 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3572 NLM_F_MULTI);
3573 }
3574
3575 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3576 struct netlink_ext_ack *extack)
3577 {
3578 struct net *net = sock_net(in_skb->sk);
3579 struct nlattr *tb[RTA_MAX+1];
3580 struct rt6_info *rt;
3581 struct sk_buff *skb;
3582 struct rtmsg *rtm;
3583 struct flowi6 fl6;
3584 int err, iif = 0, oif = 0;
3585
3586 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
3587 extack);
3588 if (err < 0)
3589 goto errout;
3590
3591 err = -EINVAL;
3592 memset(&fl6, 0, sizeof(fl6));
3593 rtm = nlmsg_data(nlh);
3594 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
3595
3596 if (tb[RTA_SRC]) {
3597 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3598 goto errout;
3599
3600 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3601 }
3602
3603 if (tb[RTA_DST]) {
3604 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3605 goto errout;
3606
3607 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3608 }
3609
3610 if (tb[RTA_IIF])
3611 iif = nla_get_u32(tb[RTA_IIF]);
3612
3613 if (tb[RTA_OIF])
3614 oif = nla_get_u32(tb[RTA_OIF]);
3615
3616 if (tb[RTA_MARK])
3617 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3618
3619 if (tb[RTA_UID])
3620 fl6.flowi6_uid = make_kuid(current_user_ns(),
3621 nla_get_u32(tb[RTA_UID]));
3622 else
3623 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3624
3625 if (iif) {
3626 struct net_device *dev;
3627 int flags = 0;
3628
3629 dev = __dev_get_by_index(net, iif);
3630 if (!dev) {
3631 err = -ENODEV;
3632 goto errout;
3633 }
3634
3635 fl6.flowi6_iif = iif;
3636
3637 if (!ipv6_addr_any(&fl6.saddr))
3638 flags |= RT6_LOOKUP_F_HAS_SADDR;
3639
3640 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3641 flags);
3642 } else {
3643 fl6.flowi6_oif = oif;
3644
3645 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3646 }
3647
3648 if (rt == net->ipv6.ip6_null_entry) {
3649 err = rt->dst.error;
3650 ip6_rt_put(rt);
3651 goto errout;
3652 }
3653
3654 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3655 if (!skb) {
3656 ip6_rt_put(rt);
3657 err = -ENOBUFS;
3658 goto errout;
3659 }
3660
3661 skb_dst_set(skb, &rt->dst);
3662
3663 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3664 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3665 nlh->nlmsg_seq, 0);
3666 if (err < 0) {
3667 kfree_skb(skb);
3668 goto errout;
3669 }
3670
3671 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3672 errout:
3673 return err;
3674 }
3675
3676 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3677 unsigned int nlm_flags)
3678 {
3679 struct sk_buff *skb;
3680 struct net *net = info->nl_net;
3681 u32 seq;
3682 int err;
3683
3684 err = -ENOBUFS;
3685 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3686
3687 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3688 if (!skb)
3689 goto errout;
3690
3691 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3692 event, info->portid, seq, nlm_flags);
3693 if (err < 0) {
3694 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3695 WARN_ON(err == -EMSGSIZE);
3696 kfree_skb(skb);
3697 goto errout;
3698 }
3699 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3700 info->nlh, gfp_any());
3701 return;
3702 errout:
3703 if (err < 0)
3704 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3705 }
3706
3707 static int ip6_route_dev_notify(struct notifier_block *this,
3708 unsigned long event, void *ptr)
3709 {
3710 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3711 struct net *net = dev_net(dev);
3712
3713 if (!(dev->flags & IFF_LOOPBACK))
3714 return NOTIFY_OK;
3715
3716 if (event == NETDEV_REGISTER) {
3717 net->ipv6.ip6_null_entry->dst.dev = dev;
3718 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3719 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3720 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3721 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3722 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3723 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3724 #endif
3725 } else if (event == NETDEV_UNREGISTER) {
3726 in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev);
3727 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3728 in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev);
3729 in6_dev_put(net->ipv6.ip6_blk_hole_entry->rt6i_idev);
3730 #endif
3731 }
3732
3733 return NOTIFY_OK;
3734 }
3735
3736 /*
3737 * /proc
3738 */
3739
3740 #ifdef CONFIG_PROC_FS
3741
3742 static const struct file_operations ipv6_route_proc_fops = {
3743 .owner = THIS_MODULE,
3744 .open = ipv6_route_open,
3745 .read = seq_read,
3746 .llseek = seq_lseek,
3747 .release = seq_release_net,
3748 };
3749
3750 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3751 {
3752 struct net *net = (struct net *)seq->private;
3753 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3754 net->ipv6.rt6_stats->fib_nodes,
3755 net->ipv6.rt6_stats->fib_route_nodes,
3756 net->ipv6.rt6_stats->fib_rt_alloc,
3757 net->ipv6.rt6_stats->fib_rt_entries,
3758 net->ipv6.rt6_stats->fib_rt_cache,
3759 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3760 net->ipv6.rt6_stats->fib_discarded_routes);
3761
3762 return 0;
3763 }
3764
3765 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3766 {
3767 return single_open_net(inode, file, rt6_stats_seq_show);
3768 }
3769
3770 static const struct file_operations rt6_stats_seq_fops = {
3771 .owner = THIS_MODULE,
3772 .open = rt6_stats_seq_open,
3773 .read = seq_read,
3774 .llseek = seq_lseek,
3775 .release = single_release_net,
3776 };
3777 #endif /* CONFIG_PROC_FS */
3778
3779 #ifdef CONFIG_SYSCTL
3780
3781 static
3782 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3783 void __user *buffer, size_t *lenp, loff_t *ppos)
3784 {
3785 struct net *net;
3786 int delay;
3787 if (!write)
3788 return -EINVAL;
3789
3790 net = (struct net *)ctl->extra1;
3791 delay = net->ipv6.sysctl.flush_delay;
3792 proc_dointvec(ctl, write, buffer, lenp, ppos);
3793 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3794 return 0;
3795 }
3796
3797 struct ctl_table ipv6_route_table_template[] = {
3798 {
3799 .procname = "flush",
3800 .data = &init_net.ipv6.sysctl.flush_delay,
3801 .maxlen = sizeof(int),
3802 .mode = 0200,
3803 .proc_handler = ipv6_sysctl_rtcache_flush
3804 },
3805 {
3806 .procname = "gc_thresh",
3807 .data = &ip6_dst_ops_template.gc_thresh,
3808 .maxlen = sizeof(int),
3809 .mode = 0644,
3810 .proc_handler = proc_dointvec,
3811 },
3812 {
3813 .procname = "max_size",
3814 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3815 .maxlen = sizeof(int),
3816 .mode = 0644,
3817 .proc_handler = proc_dointvec,
3818 },
3819 {
3820 .procname = "gc_min_interval",
3821 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3822 .maxlen = sizeof(int),
3823 .mode = 0644,
3824 .proc_handler = proc_dointvec_jiffies,
3825 },
3826 {
3827 .procname = "gc_timeout",
3828 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3829 .maxlen = sizeof(int),
3830 .mode = 0644,
3831 .proc_handler = proc_dointvec_jiffies,
3832 },
3833 {
3834 .procname = "gc_interval",
3835 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3836 .maxlen = sizeof(int),
3837 .mode = 0644,
3838 .proc_handler = proc_dointvec_jiffies,
3839 },
3840 {
3841 .procname = "gc_elasticity",
3842 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3843 .maxlen = sizeof(int),
3844 .mode = 0644,
3845 .proc_handler = proc_dointvec,
3846 },
3847 {
3848 .procname = "mtu_expires",
3849 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3850 .maxlen = sizeof(int),
3851 .mode = 0644,
3852 .proc_handler = proc_dointvec_jiffies,
3853 },
3854 {
3855 .procname = "min_adv_mss",
3856 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3857 .maxlen = sizeof(int),
3858 .mode = 0644,
3859 .proc_handler = proc_dointvec,
3860 },
3861 {
3862 .procname = "gc_min_interval_ms",
3863 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3864 .maxlen = sizeof(int),
3865 .mode = 0644,
3866 .proc_handler = proc_dointvec_ms_jiffies,
3867 },
3868 { }
3869 };
3870
3871 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3872 {
3873 struct ctl_table *table;
3874
3875 table = kmemdup(ipv6_route_table_template,
3876 sizeof(ipv6_route_table_template),
3877 GFP_KERNEL);
3878
3879 if (table) {
3880 table[0].data = &net->ipv6.sysctl.flush_delay;
3881 table[0].extra1 = net;
3882 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3883 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3884 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3885 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3886 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3887 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3888 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3889 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3890 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3891
3892 /* Don't export sysctls to unprivileged users */
3893 if (net->user_ns != &init_user_ns)
3894 table[0].procname = NULL;
3895 }
3896
3897 return table;
3898 }
3899 #endif
3900
3901 static int __net_init ip6_route_net_init(struct net *net)
3902 {
3903 int ret = -ENOMEM;
3904
3905 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3906 sizeof(net->ipv6.ip6_dst_ops));
3907
3908 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3909 goto out_ip6_dst_ops;
3910
3911 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3912 sizeof(*net->ipv6.ip6_null_entry),
3913 GFP_KERNEL);
3914 if (!net->ipv6.ip6_null_entry)
3915 goto out_ip6_dst_entries;
3916 net->ipv6.ip6_null_entry->dst.path =
3917 (struct dst_entry *)net->ipv6.ip6_null_entry;
3918 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3919 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3920 ip6_template_metrics, true);
3921
3922 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3923 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3924 sizeof(*net->ipv6.ip6_prohibit_entry),
3925 GFP_KERNEL);
3926 if (!net->ipv6.ip6_prohibit_entry)
3927 goto out_ip6_null_entry;
3928 net->ipv6.ip6_prohibit_entry->dst.path =
3929 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3930 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3931 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3932 ip6_template_metrics, true);
3933
3934 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3935 sizeof(*net->ipv6.ip6_blk_hole_entry),
3936 GFP_KERNEL);
3937 if (!net->ipv6.ip6_blk_hole_entry)
3938 goto out_ip6_prohibit_entry;
3939 net->ipv6.ip6_blk_hole_entry->dst.path =
3940 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3941 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3942 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3943 ip6_template_metrics, true);
3944 #endif
3945
3946 net->ipv6.sysctl.flush_delay = 0;
3947 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3948 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3949 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3950 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3951 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3952 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3953 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3954
3955 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3956
3957 ret = 0;
3958 out:
3959 return ret;
3960
3961 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3962 out_ip6_prohibit_entry:
3963 kfree(net->ipv6.ip6_prohibit_entry);
3964 out_ip6_null_entry:
3965 kfree(net->ipv6.ip6_null_entry);
3966 #endif
3967 out_ip6_dst_entries:
3968 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3969 out_ip6_dst_ops:
3970 goto out;
3971 }
3972
3973 static void __net_exit ip6_route_net_exit(struct net *net)
3974 {
3975 kfree(net->ipv6.ip6_null_entry);
3976 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3977 kfree(net->ipv6.ip6_prohibit_entry);
3978 kfree(net->ipv6.ip6_blk_hole_entry);
3979 #endif
3980 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3981 }
3982
3983 static int __net_init ip6_route_net_init_late(struct net *net)
3984 {
3985 #ifdef CONFIG_PROC_FS
3986 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3987 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3988 #endif
3989 return 0;
3990 }
3991
3992 static void __net_exit ip6_route_net_exit_late(struct net *net)
3993 {
3994 #ifdef CONFIG_PROC_FS
3995 remove_proc_entry("ipv6_route", net->proc_net);
3996 remove_proc_entry("rt6_stats", net->proc_net);
3997 #endif
3998 }
3999
4000 static struct pernet_operations ip6_route_net_ops = {
4001 .init = ip6_route_net_init,
4002 .exit = ip6_route_net_exit,
4003 };
4004
4005 static int __net_init ipv6_inetpeer_init(struct net *net)
4006 {
4007 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
4008
4009 if (!bp)
4010 return -ENOMEM;
4011 inet_peer_base_init(bp);
4012 net->ipv6.peers = bp;
4013 return 0;
4014 }
4015
4016 static void __net_exit ipv6_inetpeer_exit(struct net *net)
4017 {
4018 struct inet_peer_base *bp = net->ipv6.peers;
4019
4020 net->ipv6.peers = NULL;
4021 inetpeer_invalidate_tree(bp);
4022 kfree(bp);
4023 }
4024
4025 static struct pernet_operations ipv6_inetpeer_ops = {
4026 .init = ipv6_inetpeer_init,
4027 .exit = ipv6_inetpeer_exit,
4028 };
4029
4030 static struct pernet_operations ip6_route_net_late_ops = {
4031 .init = ip6_route_net_init_late,
4032 .exit = ip6_route_net_exit_late,
4033 };
4034
4035 static struct notifier_block ip6_route_dev_notifier = {
4036 .notifier_call = ip6_route_dev_notify,
4037 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
4038 };
4039
4040 void __init ip6_route_init_special_entries(void)
4041 {
4042 /* Registering of the loopback is done before this portion of code,
4043 * the loopback reference in rt6_info will not be taken, do it
4044 * manually for init_net */
4045 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
4046 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4047 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4048 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
4049 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4050 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
4051 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4052 #endif
4053 }
4054
4055 int __init ip6_route_init(void)
4056 {
4057 int ret;
4058 int cpu;
4059
4060 ret = -ENOMEM;
4061 ip6_dst_ops_template.kmem_cachep =
4062 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
4063 SLAB_HWCACHE_ALIGN, NULL);
4064 if (!ip6_dst_ops_template.kmem_cachep)
4065 goto out;
4066
4067 ret = dst_entries_init(&ip6_dst_blackhole_ops);
4068 if (ret)
4069 goto out_kmem_cache;
4070
4071 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
4072 if (ret)
4073 goto out_dst_entries;
4074
4075 ret = register_pernet_subsys(&ip6_route_net_ops);
4076 if (ret)
4077 goto out_register_inetpeer;
4078
4079 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
4080
4081 ret = fib6_init();
4082 if (ret)
4083 goto out_register_subsys;
4084
4085 ret = xfrm6_init();
4086 if (ret)
4087 goto out_fib6_init;
4088
4089 ret = fib6_rules_init();
4090 if (ret)
4091 goto xfrm6_init;
4092
4093 ret = register_pernet_subsys(&ip6_route_net_late_ops);
4094 if (ret)
4095 goto fib6_rules_init;
4096
4097 ret = -ENOBUFS;
4098 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
4099 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
4100 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
4101 goto out_register_late_subsys;
4102
4103 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
4104 if (ret)
4105 goto out_register_late_subsys;
4106
4107 for_each_possible_cpu(cpu) {
4108 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
4109
4110 INIT_LIST_HEAD(&ul->head);
4111 spin_lock_init(&ul->lock);
4112 }
4113
4114 out:
4115 return ret;
4116
4117 out_register_late_subsys:
4118 unregister_pernet_subsys(&ip6_route_net_late_ops);
4119 fib6_rules_init:
4120 fib6_rules_cleanup();
4121 xfrm6_init:
4122 xfrm6_fini();
4123 out_fib6_init:
4124 fib6_gc_cleanup();
4125 out_register_subsys:
4126 unregister_pernet_subsys(&ip6_route_net_ops);
4127 out_register_inetpeer:
4128 unregister_pernet_subsys(&ipv6_inetpeer_ops);
4129 out_dst_entries:
4130 dst_entries_destroy(&ip6_dst_blackhole_ops);
4131 out_kmem_cache:
4132 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
4133 goto out;
4134 }
4135
4136 void ip6_route_cleanup(void)
4137 {
4138 unregister_netdevice_notifier(&ip6_route_dev_notifier);
4139 unregister_pernet_subsys(&ip6_route_net_late_ops);
4140 fib6_rules_cleanup();
4141 xfrm6_fini();
4142 fib6_gc_cleanup();
4143 unregister_pernet_subsys(&ipv6_inetpeer_ops);
4144 unregister_pernet_subsys(&ip6_route_net_ops);
4145 dst_entries_destroy(&ip6_dst_blackhole_ops);
4146 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
4147 }
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