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[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->rt6i_uncached_list = ul;
132
133 spin_lock_bh(&ul->lock);
134 list_add_tail(&rt->rt6i_uncached, &ul->head);
135 spin_unlock_bh(&ul->lock);
136 }
137
138 static void rt6_uncached_list_del(struct rt6_info *rt)
139 {
140 if (!list_empty(&rt->rt6i_uncached)) {
141 struct uncached_list *ul = rt->rt6i_uncached_list;
142
143 spin_lock_bh(&ul->lock);
144 list_del(&rt->rt6i_uncached);
145 spin_unlock_bh(&ul->lock);
146 }
147 }
148
149 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
150 {
151 struct net_device *loopback_dev = net->loopback_dev;
152 int cpu;
153
154 if (dev == loopback_dev)
155 return;
156
157 for_each_possible_cpu(cpu) {
158 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
159 struct rt6_info *rt;
160
161 spin_lock_bh(&ul->lock);
162 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
163 struct inet6_dev *rt_idev = rt->rt6i_idev;
164 struct net_device *rt_dev = rt->dst.dev;
165
166 if (rt_idev->dev == dev) {
167 rt->rt6i_idev = in6_dev_get(loopback_dev);
168 in6_dev_put(rt_idev);
169 }
170
171 if (rt_dev == dev) {
172 rt->dst.dev = loopback_dev;
173 dev_hold(rt->dst.dev);
174 dev_put(rt_dev);
175 }
176 }
177 spin_unlock_bh(&ul->lock);
178 }
179 }
180
181 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
182 {
183 return dst_metrics_write_ptr(rt->dst.from);
184 }
185
186 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
187 {
188 struct rt6_info *rt = (struct rt6_info *)dst;
189
190 if (rt->rt6i_flags & RTF_PCPU)
191 return rt6_pcpu_cow_metrics(rt);
192 else if (rt->rt6i_flags & RTF_CACHE)
193 return NULL;
194 else
195 return dst_cow_metrics_generic(dst, old);
196 }
197
198 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
199 struct sk_buff *skb,
200 const void *daddr)
201 {
202 struct in6_addr *p = &rt->rt6i_gateway;
203
204 if (!ipv6_addr_any(p))
205 return (const void *) p;
206 else if (skb)
207 return &ipv6_hdr(skb)->daddr;
208 return daddr;
209 }
210
211 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
212 struct sk_buff *skb,
213 const void *daddr)
214 {
215 struct rt6_info *rt = (struct rt6_info *) dst;
216 struct neighbour *n;
217
218 daddr = choose_neigh_daddr(rt, skb, daddr);
219 n = __ipv6_neigh_lookup(dst->dev, daddr);
220 if (n)
221 return n;
222 return neigh_create(&nd_tbl, daddr, dst->dev);
223 }
224
225 static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
226 {
227 struct net_device *dev = dst->dev;
228 struct rt6_info *rt = (struct rt6_info *)dst;
229
230 daddr = choose_neigh_daddr(rt, NULL, daddr);
231 if (!daddr)
232 return;
233 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
234 return;
235 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
236 return;
237 __ipv6_confirm_neigh(dev, daddr);
238 }
239
240 static struct dst_ops ip6_dst_ops_template = {
241 .family = AF_INET6,
242 .gc = ip6_dst_gc,
243 .gc_thresh = 1024,
244 .check = ip6_dst_check,
245 .default_advmss = ip6_default_advmss,
246 .mtu = ip6_mtu,
247 .cow_metrics = ipv6_cow_metrics,
248 .destroy = ip6_dst_destroy,
249 .ifdown = ip6_dst_ifdown,
250 .negative_advice = ip6_negative_advice,
251 .link_failure = ip6_link_failure,
252 .update_pmtu = ip6_rt_update_pmtu,
253 .redirect = rt6_do_redirect,
254 .local_out = __ip6_local_out,
255 .neigh_lookup = ip6_neigh_lookup,
256 .confirm_neigh = ip6_confirm_neigh,
257 };
258
259 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
260 {
261 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
262
263 return mtu ? : dst->dev->mtu;
264 }
265
266 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
267 struct sk_buff *skb, u32 mtu)
268 {
269 }
270
271 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
272 struct sk_buff *skb)
273 {
274 }
275
276 static struct dst_ops ip6_dst_blackhole_ops = {
277 .family = AF_INET6,
278 .destroy = ip6_dst_destroy,
279 .check = ip6_dst_check,
280 .mtu = ip6_blackhole_mtu,
281 .default_advmss = ip6_default_advmss,
282 .update_pmtu = ip6_rt_blackhole_update_pmtu,
283 .redirect = ip6_rt_blackhole_redirect,
284 .cow_metrics = dst_cow_metrics_generic,
285 .neigh_lookup = ip6_neigh_lookup,
286 };
287
288 static const u32 ip6_template_metrics[RTAX_MAX] = {
289 [RTAX_HOPLIMIT - 1] = 0,
290 };
291
292 static const struct rt6_info ip6_null_entry_template = {
293 .dst = {
294 .__refcnt = ATOMIC_INIT(1),
295 .__use = 1,
296 .obsolete = DST_OBSOLETE_FORCE_CHK,
297 .error = -ENETUNREACH,
298 .input = ip6_pkt_discard,
299 .output = ip6_pkt_discard_out,
300 },
301 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
302 .rt6i_protocol = RTPROT_KERNEL,
303 .rt6i_metric = ~(u32) 0,
304 .rt6i_ref = ATOMIC_INIT(1),
305 };
306
307 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
308
309 static const struct rt6_info ip6_prohibit_entry_template = {
310 .dst = {
311 .__refcnt = ATOMIC_INIT(1),
312 .__use = 1,
313 .obsolete = DST_OBSOLETE_FORCE_CHK,
314 .error = -EACCES,
315 .input = ip6_pkt_prohibit,
316 .output = ip6_pkt_prohibit_out,
317 },
318 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
319 .rt6i_protocol = RTPROT_KERNEL,
320 .rt6i_metric = ~(u32) 0,
321 .rt6i_ref = ATOMIC_INIT(1),
322 };
323
324 static const struct rt6_info ip6_blk_hole_entry_template = {
325 .dst = {
326 .__refcnt = ATOMIC_INIT(1),
327 .__use = 1,
328 .obsolete = DST_OBSOLETE_FORCE_CHK,
329 .error = -EINVAL,
330 .input = dst_discard,
331 .output = dst_discard_out,
332 },
333 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
334 .rt6i_protocol = RTPROT_KERNEL,
335 .rt6i_metric = ~(u32) 0,
336 .rt6i_ref = ATOMIC_INIT(1),
337 };
338
339 #endif
340
341 static void rt6_info_init(struct rt6_info *rt)
342 {
343 struct dst_entry *dst = &rt->dst;
344
345 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
346 INIT_LIST_HEAD(&rt->rt6i_siblings);
347 INIT_LIST_HEAD(&rt->rt6i_uncached);
348 }
349
350 /* allocate dst with ip6_dst_ops */
351 static struct rt6_info *__ip6_dst_alloc(struct net *net,
352 struct net_device *dev,
353 int flags)
354 {
355 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
356 1, DST_OBSOLETE_FORCE_CHK, flags);
357
358 if (rt)
359 rt6_info_init(rt);
360
361 return rt;
362 }
363
364 struct rt6_info *ip6_dst_alloc(struct net *net,
365 struct net_device *dev,
366 int flags)
367 {
368 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
369
370 if (rt) {
371 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
372 if (rt->rt6i_pcpu) {
373 int cpu;
374
375 for_each_possible_cpu(cpu) {
376 struct rt6_info **p;
377
378 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
379 /* no one shares rt */
380 *p = NULL;
381 }
382 } else {
383 dst_release_immediate(&rt->dst);
384 return NULL;
385 }
386 }
387
388 return rt;
389 }
390 EXPORT_SYMBOL(ip6_dst_alloc);
391
392 static void ip6_dst_destroy(struct dst_entry *dst)
393 {
394 struct rt6_info *rt = (struct rt6_info *)dst;
395 struct dst_entry *from = dst->from;
396 struct inet6_dev *idev;
397
398 dst_destroy_metrics_generic(dst);
399 free_percpu(rt->rt6i_pcpu);
400 rt6_uncached_list_del(rt);
401
402 idev = rt->rt6i_idev;
403 if (idev) {
404 rt->rt6i_idev = NULL;
405 in6_dev_put(idev);
406 }
407
408 dst->from = NULL;
409 dst_release(from);
410 }
411
412 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
413 int how)
414 {
415 struct rt6_info *rt = (struct rt6_info *)dst;
416 struct inet6_dev *idev = rt->rt6i_idev;
417 struct net_device *loopback_dev =
418 dev_net(dev)->loopback_dev;
419
420 if (dev != loopback_dev) {
421 if (idev && idev->dev == dev) {
422 struct inet6_dev *loopback_idev =
423 in6_dev_get(loopback_dev);
424 if (loopback_idev) {
425 rt->rt6i_idev = loopback_idev;
426 in6_dev_put(idev);
427 }
428 }
429 }
430 }
431
432 static bool __rt6_check_expired(const struct rt6_info *rt)
433 {
434 if (rt->rt6i_flags & RTF_EXPIRES)
435 return time_after(jiffies, rt->dst.expires);
436 else
437 return false;
438 }
439
440 static bool rt6_check_expired(const struct rt6_info *rt)
441 {
442 if (rt->rt6i_flags & RTF_EXPIRES) {
443 if (time_after(jiffies, rt->dst.expires))
444 return true;
445 } else if (rt->dst.from) {
446 return rt6_check_expired((struct rt6_info *) rt->dst.from);
447 }
448 return false;
449 }
450
451 /* Multipath route selection:
452 * Hash based function using packet header and flowlabel.
453 * Adapted from fib_info_hashfn()
454 */
455 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
456 const struct flowi6 *fl6)
457 {
458 return get_hash_from_flowi6(fl6) % candidate_count;
459 }
460
461 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
462 struct flowi6 *fl6, int oif,
463 int strict)
464 {
465 struct rt6_info *sibling, *next_sibling;
466 int route_choosen;
467
468 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
469 /* Don't change the route, if route_choosen == 0
470 * (siblings does not include ourself)
471 */
472 if (route_choosen)
473 list_for_each_entry_safe(sibling, next_sibling,
474 &match->rt6i_siblings, rt6i_siblings) {
475 route_choosen--;
476 if (route_choosen == 0) {
477 if (rt6_score_route(sibling, oif, strict) < 0)
478 break;
479 match = sibling;
480 break;
481 }
482 }
483 return match;
484 }
485
486 /*
487 * Route lookup. Any table->tb6_lock is implied.
488 */
489
490 static inline struct rt6_info *rt6_device_match(struct net *net,
491 struct rt6_info *rt,
492 const struct in6_addr *saddr,
493 int oif,
494 int flags)
495 {
496 struct rt6_info *local = NULL;
497 struct rt6_info *sprt;
498
499 if (!oif && ipv6_addr_any(saddr))
500 goto out;
501
502 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
503 struct net_device *dev = sprt->dst.dev;
504
505 if (oif) {
506 if (dev->ifindex == oif)
507 return sprt;
508 if (dev->flags & IFF_LOOPBACK) {
509 if (!sprt->rt6i_idev ||
510 sprt->rt6i_idev->dev->ifindex != oif) {
511 if (flags & RT6_LOOKUP_F_IFACE)
512 continue;
513 if (local &&
514 local->rt6i_idev->dev->ifindex == oif)
515 continue;
516 }
517 local = sprt;
518 }
519 } else {
520 if (ipv6_chk_addr(net, saddr, dev,
521 flags & RT6_LOOKUP_F_IFACE))
522 return sprt;
523 }
524 }
525
526 if (oif) {
527 if (local)
528 return local;
529
530 if (flags & RT6_LOOKUP_F_IFACE)
531 return net->ipv6.ip6_null_entry;
532 }
533 out:
534 return rt;
535 }
536
537 #ifdef CONFIG_IPV6_ROUTER_PREF
538 struct __rt6_probe_work {
539 struct work_struct work;
540 struct in6_addr target;
541 struct net_device *dev;
542 };
543
544 static void rt6_probe_deferred(struct work_struct *w)
545 {
546 struct in6_addr mcaddr;
547 struct __rt6_probe_work *work =
548 container_of(w, struct __rt6_probe_work, work);
549
550 addrconf_addr_solict_mult(&work->target, &mcaddr);
551 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
552 dev_put(work->dev);
553 kfree(work);
554 }
555
556 static void rt6_probe(struct rt6_info *rt)
557 {
558 struct __rt6_probe_work *work;
559 struct neighbour *neigh;
560 /*
561 * Okay, this does not seem to be appropriate
562 * for now, however, we need to check if it
563 * is really so; aka Router Reachability Probing.
564 *
565 * Router Reachability Probe MUST be rate-limited
566 * to no more than one per minute.
567 */
568 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
569 return;
570 rcu_read_lock_bh();
571 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
572 if (neigh) {
573 if (neigh->nud_state & NUD_VALID)
574 goto out;
575
576 work = NULL;
577 write_lock(&neigh->lock);
578 if (!(neigh->nud_state & NUD_VALID) &&
579 time_after(jiffies,
580 neigh->updated +
581 rt->rt6i_idev->cnf.rtr_probe_interval)) {
582 work = kmalloc(sizeof(*work), GFP_ATOMIC);
583 if (work)
584 __neigh_set_probe_once(neigh);
585 }
586 write_unlock(&neigh->lock);
587 } else {
588 work = kmalloc(sizeof(*work), GFP_ATOMIC);
589 }
590
591 if (work) {
592 INIT_WORK(&work->work, rt6_probe_deferred);
593 work->target = rt->rt6i_gateway;
594 dev_hold(rt->dst.dev);
595 work->dev = rt->dst.dev;
596 schedule_work(&work->work);
597 }
598
599 out:
600 rcu_read_unlock_bh();
601 }
602 #else
603 static inline void rt6_probe(struct rt6_info *rt)
604 {
605 }
606 #endif
607
608 /*
609 * Default Router Selection (RFC 2461 6.3.6)
610 */
611 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
612 {
613 struct net_device *dev = rt->dst.dev;
614 if (!oif || dev->ifindex == oif)
615 return 2;
616 if ((dev->flags & IFF_LOOPBACK) &&
617 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
618 return 1;
619 return 0;
620 }
621
622 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
623 {
624 struct neighbour *neigh;
625 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
626
627 if (rt->rt6i_flags & RTF_NONEXTHOP ||
628 !(rt->rt6i_flags & RTF_GATEWAY))
629 return RT6_NUD_SUCCEED;
630
631 rcu_read_lock_bh();
632 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
633 if (neigh) {
634 read_lock(&neigh->lock);
635 if (neigh->nud_state & NUD_VALID)
636 ret = RT6_NUD_SUCCEED;
637 #ifdef CONFIG_IPV6_ROUTER_PREF
638 else if (!(neigh->nud_state & NUD_FAILED))
639 ret = RT6_NUD_SUCCEED;
640 else
641 ret = RT6_NUD_FAIL_PROBE;
642 #endif
643 read_unlock(&neigh->lock);
644 } else {
645 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
646 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
647 }
648 rcu_read_unlock_bh();
649
650 return ret;
651 }
652
653 static int rt6_score_route(struct rt6_info *rt, int oif,
654 int strict)
655 {
656 int m;
657
658 m = rt6_check_dev(rt, oif);
659 if (!m && (strict & RT6_LOOKUP_F_IFACE))
660 return RT6_NUD_FAIL_HARD;
661 #ifdef CONFIG_IPV6_ROUTER_PREF
662 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
663 #endif
664 if (strict & RT6_LOOKUP_F_REACHABLE) {
665 int n = rt6_check_neigh(rt);
666 if (n < 0)
667 return n;
668 }
669 return m;
670 }
671
672 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
673 int *mpri, struct rt6_info *match,
674 bool *do_rr)
675 {
676 int m;
677 bool match_do_rr = false;
678 struct inet6_dev *idev = rt->rt6i_idev;
679 struct net_device *dev = rt->dst.dev;
680
681 if (dev && !netif_carrier_ok(dev) &&
682 idev->cnf.ignore_routes_with_linkdown &&
683 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
684 goto out;
685
686 if (rt6_check_expired(rt))
687 goto out;
688
689 m = rt6_score_route(rt, oif, strict);
690 if (m == RT6_NUD_FAIL_DO_RR) {
691 match_do_rr = true;
692 m = 0; /* lowest valid score */
693 } else if (m == RT6_NUD_FAIL_HARD) {
694 goto out;
695 }
696
697 if (strict & RT6_LOOKUP_F_REACHABLE)
698 rt6_probe(rt);
699
700 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
701 if (m > *mpri) {
702 *do_rr = match_do_rr;
703 *mpri = m;
704 match = rt;
705 }
706 out:
707 return match;
708 }
709
710 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
711 struct rt6_info *rr_head,
712 u32 metric, int oif, int strict,
713 bool *do_rr)
714 {
715 struct rt6_info *rt, *match, *cont;
716 int mpri = -1;
717
718 match = NULL;
719 cont = NULL;
720 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
721 if (rt->rt6i_metric != metric) {
722 cont = rt;
723 break;
724 }
725
726 match = find_match(rt, oif, strict, &mpri, match, do_rr);
727 }
728
729 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
730 if (rt->rt6i_metric != metric) {
731 cont = rt;
732 break;
733 }
734
735 match = find_match(rt, oif, strict, &mpri, match, do_rr);
736 }
737
738 if (match || !cont)
739 return match;
740
741 for (rt = cont; rt; rt = rt->dst.rt6_next)
742 match = find_match(rt, oif, strict, &mpri, match, do_rr);
743
744 return match;
745 }
746
747 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
748 {
749 struct rt6_info *match, *rt0;
750 struct net *net;
751 bool do_rr = false;
752
753 rt0 = fn->rr_ptr;
754 if (!rt0)
755 fn->rr_ptr = rt0 = fn->leaf;
756
757 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
758 &do_rr);
759
760 if (do_rr) {
761 struct rt6_info *next = rt0->dst.rt6_next;
762
763 /* no entries matched; do round-robin */
764 if (!next || next->rt6i_metric != rt0->rt6i_metric)
765 next = fn->leaf;
766
767 if (next != rt0)
768 fn->rr_ptr = next;
769 }
770
771 net = dev_net(rt0->dst.dev);
772 return match ? match : net->ipv6.ip6_null_entry;
773 }
774
775 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
776 {
777 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
778 }
779
780 #ifdef CONFIG_IPV6_ROUTE_INFO
781 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
782 const struct in6_addr *gwaddr)
783 {
784 struct net *net = dev_net(dev);
785 struct route_info *rinfo = (struct route_info *) opt;
786 struct in6_addr prefix_buf, *prefix;
787 unsigned int pref;
788 unsigned long lifetime;
789 struct rt6_info *rt;
790
791 if (len < sizeof(struct route_info)) {
792 return -EINVAL;
793 }
794
795 /* Sanity check for prefix_len and length */
796 if (rinfo->length > 3) {
797 return -EINVAL;
798 } else if (rinfo->prefix_len > 128) {
799 return -EINVAL;
800 } else if (rinfo->prefix_len > 64) {
801 if (rinfo->length < 2) {
802 return -EINVAL;
803 }
804 } else if (rinfo->prefix_len > 0) {
805 if (rinfo->length < 1) {
806 return -EINVAL;
807 }
808 }
809
810 pref = rinfo->route_pref;
811 if (pref == ICMPV6_ROUTER_PREF_INVALID)
812 return -EINVAL;
813
814 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
815
816 if (rinfo->length == 3)
817 prefix = (struct in6_addr *)rinfo->prefix;
818 else {
819 /* this function is safe */
820 ipv6_addr_prefix(&prefix_buf,
821 (struct in6_addr *)rinfo->prefix,
822 rinfo->prefix_len);
823 prefix = &prefix_buf;
824 }
825
826 if (rinfo->prefix_len == 0)
827 rt = rt6_get_dflt_router(gwaddr, dev);
828 else
829 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
830 gwaddr, dev);
831
832 if (rt && !lifetime) {
833 ip6_del_rt(rt);
834 rt = NULL;
835 }
836
837 if (!rt && lifetime)
838 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
839 dev, pref);
840 else if (rt)
841 rt->rt6i_flags = RTF_ROUTEINFO |
842 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
843
844 if (rt) {
845 if (!addrconf_finite_timeout(lifetime))
846 rt6_clean_expires(rt);
847 else
848 rt6_set_expires(rt, jiffies + HZ * lifetime);
849
850 ip6_rt_put(rt);
851 }
852 return 0;
853 }
854 #endif
855
856 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
857 struct in6_addr *saddr)
858 {
859 struct fib6_node *pn;
860 while (1) {
861 if (fn->fn_flags & RTN_TL_ROOT)
862 return NULL;
863 pn = fn->parent;
864 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
865 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
866 else
867 fn = pn;
868 if (fn->fn_flags & RTN_RTINFO)
869 return fn;
870 }
871 }
872
873 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
874 struct fib6_table *table,
875 struct flowi6 *fl6, int flags)
876 {
877 struct fib6_node *fn;
878 struct rt6_info *rt;
879
880 read_lock_bh(&table->tb6_lock);
881 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
882 restart:
883 rt = fn->leaf;
884 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
885 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
886 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
887 if (rt == net->ipv6.ip6_null_entry) {
888 fn = fib6_backtrack(fn, &fl6->saddr);
889 if (fn)
890 goto restart;
891 }
892 dst_use(&rt->dst, jiffies);
893 read_unlock_bh(&table->tb6_lock);
894
895 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
896
897 return rt;
898
899 }
900
901 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
902 int flags)
903 {
904 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
905 }
906 EXPORT_SYMBOL_GPL(ip6_route_lookup);
907
908 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
909 const struct in6_addr *saddr, int oif, int strict)
910 {
911 struct flowi6 fl6 = {
912 .flowi6_oif = oif,
913 .daddr = *daddr,
914 };
915 struct dst_entry *dst;
916 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
917
918 if (saddr) {
919 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
920 flags |= RT6_LOOKUP_F_HAS_SADDR;
921 }
922
923 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
924 if (dst->error == 0)
925 return (struct rt6_info *) dst;
926
927 dst_release(dst);
928
929 return NULL;
930 }
931 EXPORT_SYMBOL(rt6_lookup);
932
933 /* ip6_ins_rt is called with FREE table->tb6_lock.
934 * It takes new route entry, the addition fails by any reason the
935 * route is released.
936 * Caller must hold dst before calling it.
937 */
938
939 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
940 struct mx6_config *mxc,
941 struct netlink_ext_ack *extack)
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, extack);
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 /* Hold dst to account for the reference from the fib6 tree */
960 dst_hold(&rt->dst);
961 return __ip6_ins_rt(rt, &info, &mxc, NULL);
962 }
963
964 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
965 const struct in6_addr *daddr,
966 const struct in6_addr *saddr)
967 {
968 struct rt6_info *rt;
969
970 /*
971 * Clone the route.
972 */
973
974 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
975 ort = (struct rt6_info *)ort->dst.from;
976
977 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
978
979 if (!rt)
980 return NULL;
981
982 ip6_rt_copy_init(rt, ort);
983 rt->rt6i_flags |= RTF_CACHE;
984 rt->rt6i_metric = 0;
985 rt->dst.flags |= DST_HOST;
986 rt->rt6i_dst.addr = *daddr;
987 rt->rt6i_dst.plen = 128;
988
989 if (!rt6_is_gw_or_nonexthop(ort)) {
990 if (ort->rt6i_dst.plen != 128 &&
991 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
992 rt->rt6i_flags |= RTF_ANYCAST;
993 #ifdef CONFIG_IPV6_SUBTREES
994 if (rt->rt6i_src.plen && saddr) {
995 rt->rt6i_src.addr = *saddr;
996 rt->rt6i_src.plen = 128;
997 }
998 #endif
999 }
1000
1001 return rt;
1002 }
1003
1004 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
1005 {
1006 struct rt6_info *pcpu_rt;
1007
1008 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
1009 rt->dst.dev, rt->dst.flags);
1010
1011 if (!pcpu_rt)
1012 return NULL;
1013 ip6_rt_copy_init(pcpu_rt, rt);
1014 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
1015 pcpu_rt->rt6i_flags |= RTF_PCPU;
1016 return pcpu_rt;
1017 }
1018
1019 /* It should be called with read_lock_bh(&tb6_lock) acquired */
1020 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
1021 {
1022 struct rt6_info *pcpu_rt, **p;
1023
1024 p = this_cpu_ptr(rt->rt6i_pcpu);
1025 pcpu_rt = *p;
1026
1027 if (pcpu_rt) {
1028 dst_hold(&pcpu_rt->dst);
1029 rt6_dst_from_metrics_check(pcpu_rt);
1030 }
1031 return pcpu_rt;
1032 }
1033
1034 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1035 {
1036 struct fib6_table *table = rt->rt6i_table;
1037 struct rt6_info *pcpu_rt, *prev, **p;
1038
1039 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1040 if (!pcpu_rt) {
1041 struct net *net = dev_net(rt->dst.dev);
1042
1043 dst_hold(&net->ipv6.ip6_null_entry->dst);
1044 return net->ipv6.ip6_null_entry;
1045 }
1046
1047 read_lock_bh(&table->tb6_lock);
1048 if (rt->rt6i_pcpu) {
1049 p = this_cpu_ptr(rt->rt6i_pcpu);
1050 prev = cmpxchg(p, NULL, pcpu_rt);
1051 if (prev) {
1052 /* If someone did it before us, return prev instead */
1053 dst_release_immediate(&pcpu_rt->dst);
1054 pcpu_rt = prev;
1055 }
1056 } else {
1057 /* rt has been removed from the fib6 tree
1058 * before we have a chance to acquire the read_lock.
1059 * In this case, don't brother to create a pcpu rt
1060 * since rt is going away anyway. The next
1061 * dst_check() will trigger a re-lookup.
1062 */
1063 dst_release_immediate(&pcpu_rt->dst);
1064 pcpu_rt = rt;
1065 }
1066 dst_hold(&pcpu_rt->dst);
1067 rt6_dst_from_metrics_check(pcpu_rt);
1068 read_unlock_bh(&table->tb6_lock);
1069 return pcpu_rt;
1070 }
1071
1072 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1073 int oif, struct flowi6 *fl6, int flags)
1074 {
1075 struct fib6_node *fn, *saved_fn;
1076 struct rt6_info *rt;
1077 int strict = 0;
1078
1079 strict |= flags & RT6_LOOKUP_F_IFACE;
1080 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
1081 if (net->ipv6.devconf_all->forwarding == 0)
1082 strict |= RT6_LOOKUP_F_REACHABLE;
1083
1084 read_lock_bh(&table->tb6_lock);
1085
1086 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1087 saved_fn = fn;
1088
1089 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1090 oif = 0;
1091
1092 redo_rt6_select:
1093 rt = rt6_select(fn, oif, strict);
1094 if (rt->rt6i_nsiblings)
1095 rt = rt6_multipath_select(rt, fl6, oif, strict);
1096 if (rt == net->ipv6.ip6_null_entry) {
1097 fn = fib6_backtrack(fn, &fl6->saddr);
1098 if (fn)
1099 goto redo_rt6_select;
1100 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1101 /* also consider unreachable route */
1102 strict &= ~RT6_LOOKUP_F_REACHABLE;
1103 fn = saved_fn;
1104 goto redo_rt6_select;
1105 }
1106 }
1107
1108
1109 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1110 dst_use(&rt->dst, jiffies);
1111 read_unlock_bh(&table->tb6_lock);
1112
1113 rt6_dst_from_metrics_check(rt);
1114
1115 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1116 return rt;
1117 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1118 !(rt->rt6i_flags & RTF_GATEWAY))) {
1119 /* Create a RTF_CACHE clone which will not be
1120 * owned by the fib6 tree. It is for the special case where
1121 * the daddr in the skb during the neighbor look-up is different
1122 * from the fl6->daddr used to look-up route here.
1123 */
1124
1125 struct rt6_info *uncached_rt;
1126
1127 dst_use(&rt->dst, jiffies);
1128 read_unlock_bh(&table->tb6_lock);
1129
1130 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1131 dst_release(&rt->dst);
1132
1133 if (uncached_rt) {
1134 /* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc()
1135 * No need for another dst_hold()
1136 */
1137 rt6_uncached_list_add(uncached_rt);
1138 } else {
1139 uncached_rt = net->ipv6.ip6_null_entry;
1140 dst_hold(&uncached_rt->dst);
1141 }
1142
1143 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
1144 return uncached_rt;
1145
1146 } else {
1147 /* Get a percpu copy */
1148
1149 struct rt6_info *pcpu_rt;
1150
1151 rt->dst.lastuse = jiffies;
1152 rt->dst.__use++;
1153 pcpu_rt = rt6_get_pcpu_route(rt);
1154
1155 if (pcpu_rt) {
1156 read_unlock_bh(&table->tb6_lock);
1157 } else {
1158 /* We have to do the read_unlock first
1159 * because rt6_make_pcpu_route() may trigger
1160 * ip6_dst_gc() which will take the write_lock.
1161 */
1162 dst_hold(&rt->dst);
1163 read_unlock_bh(&table->tb6_lock);
1164 pcpu_rt = rt6_make_pcpu_route(rt);
1165 dst_release(&rt->dst);
1166 }
1167
1168 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
1169 return pcpu_rt;
1170
1171 }
1172 }
1173 EXPORT_SYMBOL_GPL(ip6_pol_route);
1174
1175 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1176 struct flowi6 *fl6, int flags)
1177 {
1178 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1179 }
1180
1181 struct dst_entry *ip6_route_input_lookup(struct net *net,
1182 struct net_device *dev,
1183 struct flowi6 *fl6, int flags)
1184 {
1185 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1186 flags |= RT6_LOOKUP_F_IFACE;
1187
1188 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1189 }
1190 EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
1191
1192 void ip6_route_input(struct sk_buff *skb)
1193 {
1194 const struct ipv6hdr *iph = ipv6_hdr(skb);
1195 struct net *net = dev_net(skb->dev);
1196 int flags = RT6_LOOKUP_F_HAS_SADDR;
1197 struct ip_tunnel_info *tun_info;
1198 struct flowi6 fl6 = {
1199 .flowi6_iif = skb->dev->ifindex,
1200 .daddr = iph->daddr,
1201 .saddr = iph->saddr,
1202 .flowlabel = ip6_flowinfo(iph),
1203 .flowi6_mark = skb->mark,
1204 .flowi6_proto = iph->nexthdr,
1205 };
1206
1207 tun_info = skb_tunnel_info(skb);
1208 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1209 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1210 skb_dst_drop(skb);
1211 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1212 }
1213
1214 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1215 struct flowi6 *fl6, int flags)
1216 {
1217 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1218 }
1219
1220 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1221 struct flowi6 *fl6, int flags)
1222 {
1223 bool any_src;
1224
1225 if (rt6_need_strict(&fl6->daddr)) {
1226 struct dst_entry *dst;
1227
1228 dst = l3mdev_link_scope_lookup(net, fl6);
1229 if (dst)
1230 return dst;
1231 }
1232
1233 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1234
1235 any_src = ipv6_addr_any(&fl6->saddr);
1236 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1237 (fl6->flowi6_oif && any_src))
1238 flags |= RT6_LOOKUP_F_IFACE;
1239
1240 if (!any_src)
1241 flags |= RT6_LOOKUP_F_HAS_SADDR;
1242 else if (sk)
1243 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1244
1245 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1246 }
1247 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1248
1249 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1250 {
1251 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1252 struct net_device *loopback_dev = net->loopback_dev;
1253 struct dst_entry *new = NULL;
1254
1255 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
1256 DST_OBSOLETE_NONE, 0);
1257 if (rt) {
1258 rt6_info_init(rt);
1259
1260 new = &rt->dst;
1261 new->__use = 1;
1262 new->input = dst_discard;
1263 new->output = dst_discard_out;
1264
1265 dst_copy_metrics(new, &ort->dst);
1266
1267 rt->rt6i_idev = in6_dev_get(loopback_dev);
1268 rt->rt6i_gateway = ort->rt6i_gateway;
1269 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1270 rt->rt6i_metric = 0;
1271
1272 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1273 #ifdef CONFIG_IPV6_SUBTREES
1274 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1275 #endif
1276 }
1277
1278 dst_release(dst_orig);
1279 return new ? new : ERR_PTR(-ENOMEM);
1280 }
1281
1282 /*
1283 * Destination cache support functions
1284 */
1285
1286 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1287 {
1288 if (rt->dst.from &&
1289 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1290 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1291 }
1292
1293 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1294 {
1295 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1296 return NULL;
1297
1298 if (rt6_check_expired(rt))
1299 return NULL;
1300
1301 return &rt->dst;
1302 }
1303
1304 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1305 {
1306 if (!__rt6_check_expired(rt) &&
1307 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1308 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1309 return &rt->dst;
1310 else
1311 return NULL;
1312 }
1313
1314 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1315 {
1316 struct rt6_info *rt;
1317
1318 rt = (struct rt6_info *) dst;
1319
1320 /* All IPV6 dsts are created with ->obsolete set to the value
1321 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1322 * into this function always.
1323 */
1324
1325 rt6_dst_from_metrics_check(rt);
1326
1327 if (rt->rt6i_flags & RTF_PCPU ||
1328 (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from))
1329 return rt6_dst_from_check(rt, cookie);
1330 else
1331 return rt6_check(rt, cookie);
1332 }
1333
1334 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1335 {
1336 struct rt6_info *rt = (struct rt6_info *) dst;
1337
1338 if (rt) {
1339 if (rt->rt6i_flags & RTF_CACHE) {
1340 if (rt6_check_expired(rt)) {
1341 ip6_del_rt(rt);
1342 dst = NULL;
1343 }
1344 } else {
1345 dst_release(dst);
1346 dst = NULL;
1347 }
1348 }
1349 return dst;
1350 }
1351
1352 static void ip6_link_failure(struct sk_buff *skb)
1353 {
1354 struct rt6_info *rt;
1355
1356 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1357
1358 rt = (struct rt6_info *) skb_dst(skb);
1359 if (rt) {
1360 if (rt->rt6i_flags & RTF_CACHE) {
1361 if (dst_hold_safe(&rt->dst))
1362 ip6_del_rt(rt);
1363 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1364 rt->rt6i_node->fn_sernum = -1;
1365 }
1366 }
1367 }
1368
1369 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1370 {
1371 struct net *net = dev_net(rt->dst.dev);
1372
1373 rt->rt6i_flags |= RTF_MODIFIED;
1374 rt->rt6i_pmtu = mtu;
1375 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1376 }
1377
1378 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1379 {
1380 return !(rt->rt6i_flags & RTF_CACHE) &&
1381 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1382 }
1383
1384 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1385 const struct ipv6hdr *iph, u32 mtu)
1386 {
1387 const struct in6_addr *daddr, *saddr;
1388 struct rt6_info *rt6 = (struct rt6_info *)dst;
1389
1390 if (rt6->rt6i_flags & RTF_LOCAL)
1391 return;
1392
1393 if (dst_metric_locked(dst, RTAX_MTU))
1394 return;
1395
1396 if (iph) {
1397 daddr = &iph->daddr;
1398 saddr = &iph->saddr;
1399 } else if (sk) {
1400 daddr = &sk->sk_v6_daddr;
1401 saddr = &inet6_sk(sk)->saddr;
1402 } else {
1403 daddr = NULL;
1404 saddr = NULL;
1405 }
1406 dst_confirm_neigh(dst, daddr);
1407 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1408 if (mtu >= dst_mtu(dst))
1409 return;
1410
1411 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1412 rt6_do_update_pmtu(rt6, mtu);
1413 } else if (daddr) {
1414 struct rt6_info *nrt6;
1415
1416 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1417 if (nrt6) {
1418 rt6_do_update_pmtu(nrt6, mtu);
1419
1420 /* ip6_ins_rt(nrt6) will bump the
1421 * rt6->rt6i_node->fn_sernum
1422 * which will fail the next rt6_check() and
1423 * invalidate the sk->sk_dst_cache.
1424 */
1425 ip6_ins_rt(nrt6);
1426 /* Release the reference taken in
1427 * ip6_rt_cache_alloc()
1428 */
1429 dst_release(&nrt6->dst);
1430 }
1431 }
1432 }
1433
1434 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1435 struct sk_buff *skb, u32 mtu)
1436 {
1437 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1438 }
1439
1440 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1441 int oif, u32 mark, kuid_t uid)
1442 {
1443 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1444 struct dst_entry *dst;
1445 struct flowi6 fl6;
1446
1447 memset(&fl6, 0, sizeof(fl6));
1448 fl6.flowi6_oif = oif;
1449 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1450 fl6.daddr = iph->daddr;
1451 fl6.saddr = iph->saddr;
1452 fl6.flowlabel = ip6_flowinfo(iph);
1453 fl6.flowi6_uid = uid;
1454
1455 dst = ip6_route_output(net, NULL, &fl6);
1456 if (!dst->error)
1457 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1458 dst_release(dst);
1459 }
1460 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1461
1462 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1463 {
1464 struct dst_entry *dst;
1465
1466 ip6_update_pmtu(skb, sock_net(sk), mtu,
1467 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
1468
1469 dst = __sk_dst_get(sk);
1470 if (!dst || !dst->obsolete ||
1471 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1472 return;
1473
1474 bh_lock_sock(sk);
1475 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1476 ip6_datagram_dst_update(sk, false);
1477 bh_unlock_sock(sk);
1478 }
1479 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1480
1481 /* Handle redirects */
1482 struct ip6rd_flowi {
1483 struct flowi6 fl6;
1484 struct in6_addr gateway;
1485 };
1486
1487 static struct rt6_info *__ip6_route_redirect(struct net *net,
1488 struct fib6_table *table,
1489 struct flowi6 *fl6,
1490 int flags)
1491 {
1492 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1493 struct rt6_info *rt;
1494 struct fib6_node *fn;
1495
1496 /* Get the "current" route for this destination and
1497 * check if the redirect has come from appropriate router.
1498 *
1499 * RFC 4861 specifies that redirects should only be
1500 * accepted if they come from the nexthop to the target.
1501 * Due to the way the routes are chosen, this notion
1502 * is a bit fuzzy and one might need to check all possible
1503 * routes.
1504 */
1505
1506 read_lock_bh(&table->tb6_lock);
1507 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1508 restart:
1509 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1510 if (rt6_check_expired(rt))
1511 continue;
1512 if (rt->dst.error)
1513 break;
1514 if (!(rt->rt6i_flags & RTF_GATEWAY))
1515 continue;
1516 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1517 continue;
1518 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1519 continue;
1520 break;
1521 }
1522
1523 if (!rt)
1524 rt = net->ipv6.ip6_null_entry;
1525 else if (rt->dst.error) {
1526 rt = net->ipv6.ip6_null_entry;
1527 goto out;
1528 }
1529
1530 if (rt == net->ipv6.ip6_null_entry) {
1531 fn = fib6_backtrack(fn, &fl6->saddr);
1532 if (fn)
1533 goto restart;
1534 }
1535
1536 out:
1537 dst_hold(&rt->dst);
1538
1539 read_unlock_bh(&table->tb6_lock);
1540
1541 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1542 return rt;
1543 };
1544
1545 static struct dst_entry *ip6_route_redirect(struct net *net,
1546 const struct flowi6 *fl6,
1547 const struct in6_addr *gateway)
1548 {
1549 int flags = RT6_LOOKUP_F_HAS_SADDR;
1550 struct ip6rd_flowi rdfl;
1551
1552 rdfl.fl6 = *fl6;
1553 rdfl.gateway = *gateway;
1554
1555 return fib6_rule_lookup(net, &rdfl.fl6,
1556 flags, __ip6_route_redirect);
1557 }
1558
1559 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
1560 kuid_t uid)
1561 {
1562 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1563 struct dst_entry *dst;
1564 struct flowi6 fl6;
1565
1566 memset(&fl6, 0, sizeof(fl6));
1567 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1568 fl6.flowi6_oif = oif;
1569 fl6.flowi6_mark = mark;
1570 fl6.daddr = iph->daddr;
1571 fl6.saddr = iph->saddr;
1572 fl6.flowlabel = ip6_flowinfo(iph);
1573 fl6.flowi6_uid = uid;
1574
1575 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1576 rt6_do_redirect(dst, NULL, skb);
1577 dst_release(dst);
1578 }
1579 EXPORT_SYMBOL_GPL(ip6_redirect);
1580
1581 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1582 u32 mark)
1583 {
1584 const struct ipv6hdr *iph = ipv6_hdr(skb);
1585 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1586 struct dst_entry *dst;
1587 struct flowi6 fl6;
1588
1589 memset(&fl6, 0, sizeof(fl6));
1590 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1591 fl6.flowi6_oif = oif;
1592 fl6.flowi6_mark = mark;
1593 fl6.daddr = msg->dest;
1594 fl6.saddr = iph->daddr;
1595 fl6.flowi6_uid = sock_net_uid(net, NULL);
1596
1597 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1598 rt6_do_redirect(dst, NULL, skb);
1599 dst_release(dst);
1600 }
1601
1602 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1603 {
1604 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
1605 sk->sk_uid);
1606 }
1607 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1608
1609 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1610 {
1611 struct net_device *dev = dst->dev;
1612 unsigned int mtu = dst_mtu(dst);
1613 struct net *net = dev_net(dev);
1614
1615 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1616
1617 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1618 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1619
1620 /*
1621 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1622 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1623 * IPV6_MAXPLEN is also valid and means: "any MSS,
1624 * rely only on pmtu discovery"
1625 */
1626 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1627 mtu = IPV6_MAXPLEN;
1628 return mtu;
1629 }
1630
1631 static unsigned int ip6_mtu(const struct dst_entry *dst)
1632 {
1633 const struct rt6_info *rt = (const struct rt6_info *)dst;
1634 unsigned int mtu = rt->rt6i_pmtu;
1635 struct inet6_dev *idev;
1636
1637 if (mtu)
1638 goto out;
1639
1640 mtu = dst_metric_raw(dst, RTAX_MTU);
1641 if (mtu)
1642 goto out;
1643
1644 mtu = IPV6_MIN_MTU;
1645
1646 rcu_read_lock();
1647 idev = __in6_dev_get(dst->dev);
1648 if (idev)
1649 mtu = idev->cnf.mtu6;
1650 rcu_read_unlock();
1651
1652 out:
1653 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1654
1655 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
1656 }
1657
1658 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1659 struct flowi6 *fl6)
1660 {
1661 struct dst_entry *dst;
1662 struct rt6_info *rt;
1663 struct inet6_dev *idev = in6_dev_get(dev);
1664 struct net *net = dev_net(dev);
1665
1666 if (unlikely(!idev))
1667 return ERR_PTR(-ENODEV);
1668
1669 rt = ip6_dst_alloc(net, dev, 0);
1670 if (unlikely(!rt)) {
1671 in6_dev_put(idev);
1672 dst = ERR_PTR(-ENOMEM);
1673 goto out;
1674 }
1675
1676 rt->dst.flags |= DST_HOST;
1677 rt->dst.output = ip6_output;
1678 rt->rt6i_gateway = fl6->daddr;
1679 rt->rt6i_dst.addr = fl6->daddr;
1680 rt->rt6i_dst.plen = 128;
1681 rt->rt6i_idev = idev;
1682 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1683
1684 /* Add this dst into uncached_list so that rt6_ifdown() can
1685 * do proper release of the net_device
1686 */
1687 rt6_uncached_list_add(rt);
1688
1689 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1690
1691 out:
1692 return dst;
1693 }
1694
1695 static int ip6_dst_gc(struct dst_ops *ops)
1696 {
1697 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1698 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1699 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1700 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1701 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1702 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1703 int entries;
1704
1705 entries = dst_entries_get_fast(ops);
1706 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1707 entries <= rt_max_size)
1708 goto out;
1709
1710 net->ipv6.ip6_rt_gc_expire++;
1711 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1712 entries = dst_entries_get_slow(ops);
1713 if (entries < ops->gc_thresh)
1714 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1715 out:
1716 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1717 return entries > rt_max_size;
1718 }
1719
1720 static int ip6_convert_metrics(struct mx6_config *mxc,
1721 const struct fib6_config *cfg)
1722 {
1723 bool ecn_ca = false;
1724 struct nlattr *nla;
1725 int remaining;
1726 u32 *mp;
1727
1728 if (!cfg->fc_mx)
1729 return 0;
1730
1731 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1732 if (unlikely(!mp))
1733 return -ENOMEM;
1734
1735 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1736 int type = nla_type(nla);
1737 u32 val;
1738
1739 if (!type)
1740 continue;
1741 if (unlikely(type > RTAX_MAX))
1742 goto err;
1743
1744 if (type == RTAX_CC_ALGO) {
1745 char tmp[TCP_CA_NAME_MAX];
1746
1747 nla_strlcpy(tmp, nla, sizeof(tmp));
1748 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1749 if (val == TCP_CA_UNSPEC)
1750 goto err;
1751 } else {
1752 val = nla_get_u32(nla);
1753 }
1754 if (type == RTAX_HOPLIMIT && val > 255)
1755 val = 255;
1756 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1757 goto err;
1758
1759 mp[type - 1] = val;
1760 __set_bit(type - 1, mxc->mx_valid);
1761 }
1762
1763 if (ecn_ca) {
1764 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1765 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1766 }
1767
1768 mxc->mx = mp;
1769 return 0;
1770 err:
1771 kfree(mp);
1772 return -EINVAL;
1773 }
1774
1775 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1776 struct fib6_config *cfg,
1777 const struct in6_addr *gw_addr)
1778 {
1779 struct flowi6 fl6 = {
1780 .flowi6_oif = cfg->fc_ifindex,
1781 .daddr = *gw_addr,
1782 .saddr = cfg->fc_prefsrc,
1783 };
1784 struct fib6_table *table;
1785 struct rt6_info *rt;
1786 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;
1787
1788 table = fib6_get_table(net, cfg->fc_table);
1789 if (!table)
1790 return NULL;
1791
1792 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1793 flags |= RT6_LOOKUP_F_HAS_SADDR;
1794
1795 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1796
1797 /* if table lookup failed, fall back to full lookup */
1798 if (rt == net->ipv6.ip6_null_entry) {
1799 ip6_rt_put(rt);
1800 rt = NULL;
1801 }
1802
1803 return rt;
1804 }
1805
1806 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
1807 struct netlink_ext_ack *extack)
1808 {
1809 struct net *net = cfg->fc_nlinfo.nl_net;
1810 struct rt6_info *rt = NULL;
1811 struct net_device *dev = NULL;
1812 struct inet6_dev *idev = NULL;
1813 struct fib6_table *table;
1814 int addr_type;
1815 int err = -EINVAL;
1816
1817 /* RTF_PCPU is an internal flag; can not be set by userspace */
1818 if (cfg->fc_flags & RTF_PCPU) {
1819 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
1820 goto out;
1821 }
1822
1823 if (cfg->fc_dst_len > 128) {
1824 NL_SET_ERR_MSG(extack, "Invalid prefix length");
1825 goto out;
1826 }
1827 if (cfg->fc_src_len > 128) {
1828 NL_SET_ERR_MSG(extack, "Invalid source address length");
1829 goto out;
1830 }
1831 #ifndef CONFIG_IPV6_SUBTREES
1832 if (cfg->fc_src_len) {
1833 NL_SET_ERR_MSG(extack,
1834 "Specifying source address requires IPV6_SUBTREES to be enabled");
1835 goto out;
1836 }
1837 #endif
1838 if (cfg->fc_ifindex) {
1839 err = -ENODEV;
1840 dev = dev_get_by_index(net, cfg->fc_ifindex);
1841 if (!dev)
1842 goto out;
1843 idev = in6_dev_get(dev);
1844 if (!idev)
1845 goto out;
1846 }
1847
1848 if (cfg->fc_metric == 0)
1849 cfg->fc_metric = IP6_RT_PRIO_USER;
1850
1851 err = -ENOBUFS;
1852 if (cfg->fc_nlinfo.nlh &&
1853 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1854 table = fib6_get_table(net, cfg->fc_table);
1855 if (!table) {
1856 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1857 table = fib6_new_table(net, cfg->fc_table);
1858 }
1859 } else {
1860 table = fib6_new_table(net, cfg->fc_table);
1861 }
1862
1863 if (!table)
1864 goto out;
1865
1866 rt = ip6_dst_alloc(net, NULL,
1867 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1868
1869 if (!rt) {
1870 err = -ENOMEM;
1871 goto out;
1872 }
1873
1874 if (cfg->fc_flags & RTF_EXPIRES)
1875 rt6_set_expires(rt, jiffies +
1876 clock_t_to_jiffies(cfg->fc_expires));
1877 else
1878 rt6_clean_expires(rt);
1879
1880 if (cfg->fc_protocol == RTPROT_UNSPEC)
1881 cfg->fc_protocol = RTPROT_BOOT;
1882 rt->rt6i_protocol = cfg->fc_protocol;
1883
1884 addr_type = ipv6_addr_type(&cfg->fc_dst);
1885
1886 if (addr_type & IPV6_ADDR_MULTICAST)
1887 rt->dst.input = ip6_mc_input;
1888 else if (cfg->fc_flags & RTF_LOCAL)
1889 rt->dst.input = ip6_input;
1890 else
1891 rt->dst.input = ip6_forward;
1892
1893 rt->dst.output = ip6_output;
1894
1895 if (cfg->fc_encap) {
1896 struct lwtunnel_state *lwtstate;
1897
1898 err = lwtunnel_build_state(cfg->fc_encap_type,
1899 cfg->fc_encap, AF_INET6, cfg,
1900 &lwtstate, extack);
1901 if (err)
1902 goto out;
1903 rt->dst.lwtstate = lwtstate_get(lwtstate);
1904 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1905 rt->dst.lwtstate->orig_output = rt->dst.output;
1906 rt->dst.output = lwtunnel_output;
1907 }
1908 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1909 rt->dst.lwtstate->orig_input = rt->dst.input;
1910 rt->dst.input = lwtunnel_input;
1911 }
1912 }
1913
1914 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1915 rt->rt6i_dst.plen = cfg->fc_dst_len;
1916 if (rt->rt6i_dst.plen == 128)
1917 rt->dst.flags |= DST_HOST;
1918
1919 #ifdef CONFIG_IPV6_SUBTREES
1920 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1921 rt->rt6i_src.plen = cfg->fc_src_len;
1922 #endif
1923
1924 rt->rt6i_metric = cfg->fc_metric;
1925
1926 /* We cannot add true routes via loopback here,
1927 they would result in kernel looping; promote them to reject routes
1928 */
1929 if ((cfg->fc_flags & RTF_REJECT) ||
1930 (dev && (dev->flags & IFF_LOOPBACK) &&
1931 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1932 !(cfg->fc_flags & RTF_LOCAL))) {
1933 /* hold loopback dev/idev if we haven't done so. */
1934 if (dev != net->loopback_dev) {
1935 if (dev) {
1936 dev_put(dev);
1937 in6_dev_put(idev);
1938 }
1939 dev = net->loopback_dev;
1940 dev_hold(dev);
1941 idev = in6_dev_get(dev);
1942 if (!idev) {
1943 err = -ENODEV;
1944 goto out;
1945 }
1946 }
1947 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1948 switch (cfg->fc_type) {
1949 case RTN_BLACKHOLE:
1950 rt->dst.error = -EINVAL;
1951 rt->dst.output = dst_discard_out;
1952 rt->dst.input = dst_discard;
1953 break;
1954 case RTN_PROHIBIT:
1955 rt->dst.error = -EACCES;
1956 rt->dst.output = ip6_pkt_prohibit_out;
1957 rt->dst.input = ip6_pkt_prohibit;
1958 break;
1959 case RTN_THROW:
1960 case RTN_UNREACHABLE:
1961 default:
1962 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1963 : (cfg->fc_type == RTN_UNREACHABLE)
1964 ? -EHOSTUNREACH : -ENETUNREACH;
1965 rt->dst.output = ip6_pkt_discard_out;
1966 rt->dst.input = ip6_pkt_discard;
1967 break;
1968 }
1969 goto install_route;
1970 }
1971
1972 if (cfg->fc_flags & RTF_GATEWAY) {
1973 const struct in6_addr *gw_addr;
1974 int gwa_type;
1975
1976 gw_addr = &cfg->fc_gateway;
1977 gwa_type = ipv6_addr_type(gw_addr);
1978
1979 /* if gw_addr is local we will fail to detect this in case
1980 * address is still TENTATIVE (DAD in progress). rt6_lookup()
1981 * will return already-added prefix route via interface that
1982 * prefix route was assigned to, which might be non-loopback.
1983 */
1984 err = -EINVAL;
1985 if (ipv6_chk_addr_and_flags(net, gw_addr,
1986 gwa_type & IPV6_ADDR_LINKLOCAL ?
1987 dev : NULL, 0, 0)) {
1988 NL_SET_ERR_MSG(extack, "Invalid gateway address");
1989 goto out;
1990 }
1991 rt->rt6i_gateway = *gw_addr;
1992
1993 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1994 struct rt6_info *grt = NULL;
1995
1996 /* IPv6 strictly inhibits using not link-local
1997 addresses as nexthop address.
1998 Otherwise, router will not able to send redirects.
1999 It is very good, but in some (rare!) circumstances
2000 (SIT, PtP, NBMA NOARP links) it is handy to allow
2001 some exceptions. --ANK
2002 We allow IPv4-mapped nexthops to support RFC4798-type
2003 addressing
2004 */
2005 if (!(gwa_type & (IPV6_ADDR_UNICAST |
2006 IPV6_ADDR_MAPPED))) {
2007 NL_SET_ERR_MSG(extack,
2008 "Invalid gateway address");
2009 goto out;
2010 }
2011
2012 if (cfg->fc_table) {
2013 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
2014
2015 if (grt) {
2016 if (grt->rt6i_flags & RTF_GATEWAY ||
2017 (dev && dev != grt->dst.dev)) {
2018 ip6_rt_put(grt);
2019 grt = NULL;
2020 }
2021 }
2022 }
2023
2024 if (!grt)
2025 grt = rt6_lookup(net, gw_addr, NULL,
2026 cfg->fc_ifindex, 1);
2027
2028 err = -EHOSTUNREACH;
2029 if (!grt)
2030 goto out;
2031 if (dev) {
2032 if (dev != grt->dst.dev) {
2033 ip6_rt_put(grt);
2034 goto out;
2035 }
2036 } else {
2037 dev = grt->dst.dev;
2038 idev = grt->rt6i_idev;
2039 dev_hold(dev);
2040 in6_dev_hold(grt->rt6i_idev);
2041 }
2042 if (!(grt->rt6i_flags & RTF_GATEWAY))
2043 err = 0;
2044 ip6_rt_put(grt);
2045
2046 if (err)
2047 goto out;
2048 }
2049 err = -EINVAL;
2050 if (!dev) {
2051 NL_SET_ERR_MSG(extack, "Egress device not specified");
2052 goto out;
2053 } else if (dev->flags & IFF_LOOPBACK) {
2054 NL_SET_ERR_MSG(extack,
2055 "Egress device can not be loopback device for this route");
2056 goto out;
2057 }
2058 }
2059
2060 err = -ENODEV;
2061 if (!dev)
2062 goto out;
2063
2064 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2065 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2066 NL_SET_ERR_MSG(extack, "Invalid source address");
2067 err = -EINVAL;
2068 goto out;
2069 }
2070 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2071 rt->rt6i_prefsrc.plen = 128;
2072 } else
2073 rt->rt6i_prefsrc.plen = 0;
2074
2075 rt->rt6i_flags = cfg->fc_flags;
2076
2077 install_route:
2078 rt->dst.dev = dev;
2079 rt->rt6i_idev = idev;
2080 rt->rt6i_table = table;
2081
2082 cfg->fc_nlinfo.nl_net = dev_net(dev);
2083
2084 return rt;
2085 out:
2086 if (dev)
2087 dev_put(dev);
2088 if (idev)
2089 in6_dev_put(idev);
2090 if (rt)
2091 dst_release_immediate(&rt->dst);
2092
2093 return ERR_PTR(err);
2094 }
2095
2096 int ip6_route_add(struct fib6_config *cfg,
2097 struct netlink_ext_ack *extack)
2098 {
2099 struct mx6_config mxc = { .mx = NULL, };
2100 struct rt6_info *rt;
2101 int err;
2102
2103 rt = ip6_route_info_create(cfg, extack);
2104 if (IS_ERR(rt)) {
2105 err = PTR_ERR(rt);
2106 rt = NULL;
2107 goto out;
2108 }
2109
2110 err = ip6_convert_metrics(&mxc, cfg);
2111 if (err)
2112 goto out;
2113
2114 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc, extack);
2115
2116 kfree(mxc.mx);
2117
2118 return err;
2119 out:
2120 if (rt)
2121 dst_release_immediate(&rt->dst);
2122
2123 return err;
2124 }
2125
2126 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2127 {
2128 int err;
2129 struct fib6_table *table;
2130 struct net *net = dev_net(rt->dst.dev);
2131
2132 if (rt == net->ipv6.ip6_null_entry) {
2133 err = -ENOENT;
2134 goto out;
2135 }
2136
2137 table = rt->rt6i_table;
2138 write_lock_bh(&table->tb6_lock);
2139 err = fib6_del(rt, info);
2140 write_unlock_bh(&table->tb6_lock);
2141
2142 out:
2143 ip6_rt_put(rt);
2144 return err;
2145 }
2146
2147 int ip6_del_rt(struct rt6_info *rt)
2148 {
2149 struct nl_info info = {
2150 .nl_net = dev_net(rt->dst.dev),
2151 };
2152 return __ip6_del_rt(rt, &info);
2153 }
2154
2155 static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
2156 {
2157 struct nl_info *info = &cfg->fc_nlinfo;
2158 struct net *net = info->nl_net;
2159 struct sk_buff *skb = NULL;
2160 struct fib6_table *table;
2161 int err = -ENOENT;
2162
2163 if (rt == net->ipv6.ip6_null_entry)
2164 goto out_put;
2165 table = rt->rt6i_table;
2166 write_lock_bh(&table->tb6_lock);
2167
2168 if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) {
2169 struct rt6_info *sibling, *next_sibling;
2170
2171 /* prefer to send a single notification with all hops */
2172 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
2173 if (skb) {
2174 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2175
2176 if (rt6_fill_node(net, skb, rt,
2177 NULL, NULL, 0, RTM_DELROUTE,
2178 info->portid, seq, 0) < 0) {
2179 kfree_skb(skb);
2180 skb = NULL;
2181 } else
2182 info->skip_notify = 1;
2183 }
2184
2185 list_for_each_entry_safe(sibling, next_sibling,
2186 &rt->rt6i_siblings,
2187 rt6i_siblings) {
2188 err = fib6_del(sibling, info);
2189 if (err)
2190 goto out_unlock;
2191 }
2192 }
2193
2194 err = fib6_del(rt, info);
2195 out_unlock:
2196 write_unlock_bh(&table->tb6_lock);
2197 out_put:
2198 ip6_rt_put(rt);
2199
2200 if (skb) {
2201 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2202 info->nlh, gfp_any());
2203 }
2204 return err;
2205 }
2206
2207 static int ip6_route_del(struct fib6_config *cfg,
2208 struct netlink_ext_ack *extack)
2209 {
2210 struct fib6_table *table;
2211 struct fib6_node *fn;
2212 struct rt6_info *rt;
2213 int err = -ESRCH;
2214
2215 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2216 if (!table) {
2217 NL_SET_ERR_MSG(extack, "FIB table does not exist");
2218 return err;
2219 }
2220
2221 read_lock_bh(&table->tb6_lock);
2222
2223 fn = fib6_locate(&table->tb6_root,
2224 &cfg->fc_dst, cfg->fc_dst_len,
2225 &cfg->fc_src, cfg->fc_src_len);
2226
2227 if (fn) {
2228 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2229 if ((rt->rt6i_flags & RTF_CACHE) &&
2230 !(cfg->fc_flags & RTF_CACHE))
2231 continue;
2232 if (cfg->fc_ifindex &&
2233 (!rt->dst.dev ||
2234 rt->dst.dev->ifindex != cfg->fc_ifindex))
2235 continue;
2236 if (cfg->fc_flags & RTF_GATEWAY &&
2237 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2238 continue;
2239 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2240 continue;
2241 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
2242 continue;
2243 dst_hold(&rt->dst);
2244 read_unlock_bh(&table->tb6_lock);
2245
2246 /* if gateway was specified only delete the one hop */
2247 if (cfg->fc_flags & RTF_GATEWAY)
2248 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2249
2250 return __ip6_del_rt_siblings(rt, cfg);
2251 }
2252 }
2253 read_unlock_bh(&table->tb6_lock);
2254
2255 return err;
2256 }
2257
2258 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2259 {
2260 struct netevent_redirect netevent;
2261 struct rt6_info *rt, *nrt = NULL;
2262 struct ndisc_options ndopts;
2263 struct inet6_dev *in6_dev;
2264 struct neighbour *neigh;
2265 struct rd_msg *msg;
2266 int optlen, on_link;
2267 u8 *lladdr;
2268
2269 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2270 optlen -= sizeof(*msg);
2271
2272 if (optlen < 0) {
2273 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2274 return;
2275 }
2276
2277 msg = (struct rd_msg *)icmp6_hdr(skb);
2278
2279 if (ipv6_addr_is_multicast(&msg->dest)) {
2280 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2281 return;
2282 }
2283
2284 on_link = 0;
2285 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2286 on_link = 1;
2287 } else if (ipv6_addr_type(&msg->target) !=
2288 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2289 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2290 return;
2291 }
2292
2293 in6_dev = __in6_dev_get(skb->dev);
2294 if (!in6_dev)
2295 return;
2296 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2297 return;
2298
2299 /* RFC2461 8.1:
2300 * The IP source address of the Redirect MUST be the same as the current
2301 * first-hop router for the specified ICMP Destination Address.
2302 */
2303
2304 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
2305 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2306 return;
2307 }
2308
2309 lladdr = NULL;
2310 if (ndopts.nd_opts_tgt_lladdr) {
2311 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2312 skb->dev);
2313 if (!lladdr) {
2314 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2315 return;
2316 }
2317 }
2318
2319 rt = (struct rt6_info *) dst;
2320 if (rt->rt6i_flags & RTF_REJECT) {
2321 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2322 return;
2323 }
2324
2325 /* Redirect received -> path was valid.
2326 * Look, redirects are sent only in response to data packets,
2327 * so that this nexthop apparently is reachable. --ANK
2328 */
2329 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
2330
2331 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2332 if (!neigh)
2333 return;
2334
2335 /*
2336 * We have finally decided to accept it.
2337 */
2338
2339 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
2340 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2341 NEIGH_UPDATE_F_OVERRIDE|
2342 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2343 NEIGH_UPDATE_F_ISROUTER)),
2344 NDISC_REDIRECT, &ndopts);
2345
2346 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2347 if (!nrt)
2348 goto out;
2349
2350 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2351 if (on_link)
2352 nrt->rt6i_flags &= ~RTF_GATEWAY;
2353
2354 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2355
2356 if (ip6_ins_rt(nrt))
2357 goto out_release;
2358
2359 netevent.old = &rt->dst;
2360 netevent.new = &nrt->dst;
2361 netevent.daddr = &msg->dest;
2362 netevent.neigh = neigh;
2363 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2364
2365 if (rt->rt6i_flags & RTF_CACHE) {
2366 rt = (struct rt6_info *) dst_clone(&rt->dst);
2367 ip6_del_rt(rt);
2368 }
2369
2370 out_release:
2371 /* Release the reference taken in
2372 * ip6_rt_cache_alloc()
2373 */
2374 dst_release(&nrt->dst);
2375
2376 out:
2377 neigh_release(neigh);
2378 }
2379
2380 /*
2381 * Misc support functions
2382 */
2383
2384 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2385 {
2386 BUG_ON(from->dst.from);
2387
2388 rt->rt6i_flags &= ~RTF_EXPIRES;
2389 dst_hold(&from->dst);
2390 rt->dst.from = &from->dst;
2391 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2392 }
2393
2394 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2395 {
2396 rt->dst.input = ort->dst.input;
2397 rt->dst.output = ort->dst.output;
2398 rt->rt6i_dst = ort->rt6i_dst;
2399 rt->dst.error = ort->dst.error;
2400 rt->rt6i_idev = ort->rt6i_idev;
2401 if (rt->rt6i_idev)
2402 in6_dev_hold(rt->rt6i_idev);
2403 rt->dst.lastuse = jiffies;
2404 rt->rt6i_gateway = ort->rt6i_gateway;
2405 rt->rt6i_flags = ort->rt6i_flags;
2406 rt6_set_from(rt, ort);
2407 rt->rt6i_metric = ort->rt6i_metric;
2408 #ifdef CONFIG_IPV6_SUBTREES
2409 rt->rt6i_src = ort->rt6i_src;
2410 #endif
2411 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2412 rt->rt6i_table = ort->rt6i_table;
2413 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2414 }
2415
2416 #ifdef CONFIG_IPV6_ROUTE_INFO
2417 static struct rt6_info *rt6_get_route_info(struct net *net,
2418 const struct in6_addr *prefix, int prefixlen,
2419 const struct in6_addr *gwaddr,
2420 struct net_device *dev)
2421 {
2422 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
2423 int ifindex = dev->ifindex;
2424 struct fib6_node *fn;
2425 struct rt6_info *rt = NULL;
2426 struct fib6_table *table;
2427
2428 table = fib6_get_table(net, tb_id);
2429 if (!table)
2430 return NULL;
2431
2432 read_lock_bh(&table->tb6_lock);
2433 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2434 if (!fn)
2435 goto out;
2436
2437 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2438 if (rt->dst.dev->ifindex != ifindex)
2439 continue;
2440 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2441 continue;
2442 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2443 continue;
2444 dst_hold(&rt->dst);
2445 break;
2446 }
2447 out:
2448 read_unlock_bh(&table->tb6_lock);
2449 return rt;
2450 }
2451
2452 static struct rt6_info *rt6_add_route_info(struct net *net,
2453 const struct in6_addr *prefix, int prefixlen,
2454 const struct in6_addr *gwaddr,
2455 struct net_device *dev,
2456 unsigned int pref)
2457 {
2458 struct fib6_config cfg = {
2459 .fc_metric = IP6_RT_PRIO_USER,
2460 .fc_ifindex = dev->ifindex,
2461 .fc_dst_len = prefixlen,
2462 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2463 RTF_UP | RTF_PREF(pref),
2464 .fc_nlinfo.portid = 0,
2465 .fc_nlinfo.nlh = NULL,
2466 .fc_nlinfo.nl_net = net,
2467 };
2468
2469 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
2470 cfg.fc_dst = *prefix;
2471 cfg.fc_gateway = *gwaddr;
2472
2473 /* We should treat it as a default route if prefix length is 0. */
2474 if (!prefixlen)
2475 cfg.fc_flags |= RTF_DEFAULT;
2476
2477 ip6_route_add(&cfg, NULL);
2478
2479 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
2480 }
2481 #endif
2482
2483 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2484 {
2485 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
2486 struct rt6_info *rt;
2487 struct fib6_table *table;
2488
2489 table = fib6_get_table(dev_net(dev), tb_id);
2490 if (!table)
2491 return NULL;
2492
2493 read_lock_bh(&table->tb6_lock);
2494 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2495 if (dev == rt->dst.dev &&
2496 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2497 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2498 break;
2499 }
2500 if (rt)
2501 dst_hold(&rt->dst);
2502 read_unlock_bh(&table->tb6_lock);
2503 return rt;
2504 }
2505
2506 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2507 struct net_device *dev,
2508 unsigned int pref)
2509 {
2510 struct fib6_config cfg = {
2511 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2512 .fc_metric = IP6_RT_PRIO_USER,
2513 .fc_ifindex = dev->ifindex,
2514 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2515 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2516 .fc_nlinfo.portid = 0,
2517 .fc_nlinfo.nlh = NULL,
2518 .fc_nlinfo.nl_net = dev_net(dev),
2519 };
2520
2521 cfg.fc_gateway = *gwaddr;
2522
2523 if (!ip6_route_add(&cfg, NULL)) {
2524 struct fib6_table *table;
2525
2526 table = fib6_get_table(dev_net(dev), cfg.fc_table);
2527 if (table)
2528 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
2529 }
2530
2531 return rt6_get_dflt_router(gwaddr, dev);
2532 }
2533
2534 static void __rt6_purge_dflt_routers(struct fib6_table *table)
2535 {
2536 struct rt6_info *rt;
2537
2538 restart:
2539 read_lock_bh(&table->tb6_lock);
2540 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2541 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2542 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2543 dst_hold(&rt->dst);
2544 read_unlock_bh(&table->tb6_lock);
2545 ip6_del_rt(rt);
2546 goto restart;
2547 }
2548 }
2549 read_unlock_bh(&table->tb6_lock);
2550
2551 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
2552 }
2553
2554 void rt6_purge_dflt_routers(struct net *net)
2555 {
2556 struct fib6_table *table;
2557 struct hlist_head *head;
2558 unsigned int h;
2559
2560 rcu_read_lock();
2561
2562 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
2563 head = &net->ipv6.fib_table_hash[h];
2564 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
2565 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
2566 __rt6_purge_dflt_routers(table);
2567 }
2568 }
2569
2570 rcu_read_unlock();
2571 }
2572
2573 static void rtmsg_to_fib6_config(struct net *net,
2574 struct in6_rtmsg *rtmsg,
2575 struct fib6_config *cfg)
2576 {
2577 memset(cfg, 0, sizeof(*cfg));
2578
2579 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2580 : RT6_TABLE_MAIN;
2581 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2582 cfg->fc_metric = rtmsg->rtmsg_metric;
2583 cfg->fc_expires = rtmsg->rtmsg_info;
2584 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2585 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2586 cfg->fc_flags = rtmsg->rtmsg_flags;
2587
2588 cfg->fc_nlinfo.nl_net = net;
2589
2590 cfg->fc_dst = rtmsg->rtmsg_dst;
2591 cfg->fc_src = rtmsg->rtmsg_src;
2592 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2593 }
2594
2595 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2596 {
2597 struct fib6_config cfg;
2598 struct in6_rtmsg rtmsg;
2599 int err;
2600
2601 switch (cmd) {
2602 case SIOCADDRT: /* Add a route */
2603 case SIOCDELRT: /* Delete a route */
2604 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2605 return -EPERM;
2606 err = copy_from_user(&rtmsg, arg,
2607 sizeof(struct in6_rtmsg));
2608 if (err)
2609 return -EFAULT;
2610
2611 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2612
2613 rtnl_lock();
2614 switch (cmd) {
2615 case SIOCADDRT:
2616 err = ip6_route_add(&cfg, NULL);
2617 break;
2618 case SIOCDELRT:
2619 err = ip6_route_del(&cfg, NULL);
2620 break;
2621 default:
2622 err = -EINVAL;
2623 }
2624 rtnl_unlock();
2625
2626 return err;
2627 }
2628
2629 return -EINVAL;
2630 }
2631
2632 /*
2633 * Drop the packet on the floor
2634 */
2635
2636 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2637 {
2638 int type;
2639 struct dst_entry *dst = skb_dst(skb);
2640 switch (ipstats_mib_noroutes) {
2641 case IPSTATS_MIB_INNOROUTES:
2642 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2643 if (type == IPV6_ADDR_ANY) {
2644 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2645 IPSTATS_MIB_INADDRERRORS);
2646 break;
2647 }
2648 /* FALLTHROUGH */
2649 case IPSTATS_MIB_OUTNOROUTES:
2650 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2651 ipstats_mib_noroutes);
2652 break;
2653 }
2654 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2655 kfree_skb(skb);
2656 return 0;
2657 }
2658
2659 static int ip6_pkt_discard(struct sk_buff *skb)
2660 {
2661 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2662 }
2663
2664 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2665 {
2666 skb->dev = skb_dst(skb)->dev;
2667 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2668 }
2669
2670 static int ip6_pkt_prohibit(struct sk_buff *skb)
2671 {
2672 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2673 }
2674
2675 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2676 {
2677 skb->dev = skb_dst(skb)->dev;
2678 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2679 }
2680
2681 /*
2682 * Allocate a dst for local (unicast / anycast) address.
2683 */
2684
2685 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2686 const struct in6_addr *addr,
2687 bool anycast)
2688 {
2689 u32 tb_id;
2690 struct net *net = dev_net(idev->dev);
2691 struct net_device *dev = net->loopback_dev;
2692 struct rt6_info *rt;
2693
2694 /* use L3 Master device as loopback for host routes if device
2695 * is enslaved and address is not link local or multicast
2696 */
2697 if (!rt6_need_strict(addr))
2698 dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
2699
2700 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
2701 if (!rt)
2702 return ERR_PTR(-ENOMEM);
2703
2704 in6_dev_hold(idev);
2705
2706 rt->dst.flags |= DST_HOST;
2707 rt->dst.input = ip6_input;
2708 rt->dst.output = ip6_output;
2709 rt->rt6i_idev = idev;
2710
2711 rt->rt6i_protocol = RTPROT_KERNEL;
2712 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2713 if (anycast)
2714 rt->rt6i_flags |= RTF_ANYCAST;
2715 else
2716 rt->rt6i_flags |= RTF_LOCAL;
2717
2718 rt->rt6i_gateway = *addr;
2719 rt->rt6i_dst.addr = *addr;
2720 rt->rt6i_dst.plen = 128;
2721 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2722 rt->rt6i_table = fib6_get_table(net, tb_id);
2723
2724 return rt;
2725 }
2726
2727 /* remove deleted ip from prefsrc entries */
2728 struct arg_dev_net_ip {
2729 struct net_device *dev;
2730 struct net *net;
2731 struct in6_addr *addr;
2732 };
2733
2734 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2735 {
2736 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2737 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2738 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2739
2740 if (((void *)rt->dst.dev == dev || !dev) &&
2741 rt != net->ipv6.ip6_null_entry &&
2742 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2743 /* remove prefsrc entry */
2744 rt->rt6i_prefsrc.plen = 0;
2745 }
2746 return 0;
2747 }
2748
2749 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2750 {
2751 struct net *net = dev_net(ifp->idev->dev);
2752 struct arg_dev_net_ip adni = {
2753 .dev = ifp->idev->dev,
2754 .net = net,
2755 .addr = &ifp->addr,
2756 };
2757 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2758 }
2759
2760 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2761 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2762
2763 /* Remove routers and update dst entries when gateway turn into host. */
2764 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2765 {
2766 struct in6_addr *gateway = (struct in6_addr *)arg;
2767
2768 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2769 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2770 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2771 return -1;
2772 }
2773 return 0;
2774 }
2775
2776 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2777 {
2778 fib6_clean_all(net, fib6_clean_tohost, gateway);
2779 }
2780
2781 struct arg_dev_net {
2782 struct net_device *dev;
2783 struct net *net;
2784 };
2785
2786 /* called with write lock held for table with rt */
2787 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2788 {
2789 const struct arg_dev_net *adn = arg;
2790 const struct net_device *dev = adn->dev;
2791
2792 if ((rt->dst.dev == dev || !dev) &&
2793 rt != adn->net->ipv6.ip6_null_entry &&
2794 (rt->rt6i_nsiblings == 0 ||
2795 (dev && netdev_unregistering(dev)) ||
2796 !rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
2797 return -1;
2798
2799 return 0;
2800 }
2801
2802 void rt6_ifdown(struct net *net, struct net_device *dev)
2803 {
2804 struct arg_dev_net adn = {
2805 .dev = dev,
2806 .net = net,
2807 };
2808
2809 fib6_clean_all(net, fib6_ifdown, &adn);
2810 if (dev)
2811 rt6_uncached_list_flush_dev(net, dev);
2812 }
2813
2814 struct rt6_mtu_change_arg {
2815 struct net_device *dev;
2816 unsigned int mtu;
2817 };
2818
2819 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2820 {
2821 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2822 struct inet6_dev *idev;
2823
2824 /* In IPv6 pmtu discovery is not optional,
2825 so that RTAX_MTU lock cannot disable it.
2826 We still use this lock to block changes
2827 caused by addrconf/ndisc.
2828 */
2829
2830 idev = __in6_dev_get(arg->dev);
2831 if (!idev)
2832 return 0;
2833
2834 /* For administrative MTU increase, there is no way to discover
2835 IPv6 PMTU increase, so PMTU increase should be updated here.
2836 Since RFC 1981 doesn't include administrative MTU increase
2837 update PMTU increase is a MUST. (i.e. jumbo frame)
2838 */
2839 /*
2840 If new MTU is less than route PMTU, this new MTU will be the
2841 lowest MTU in the path, update the route PMTU to reflect PMTU
2842 decreases; if new MTU is greater than route PMTU, and the
2843 old MTU is the lowest MTU in the path, update the route PMTU
2844 to reflect the increase. In this case if the other nodes' MTU
2845 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2846 PMTU discovery.
2847 */
2848 if (rt->dst.dev == arg->dev &&
2849 dst_metric_raw(&rt->dst, RTAX_MTU) &&
2850 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2851 if (rt->rt6i_flags & RTF_CACHE) {
2852 /* For RTF_CACHE with rt6i_pmtu == 0
2853 * (i.e. a redirected route),
2854 * the metrics of its rt->dst.from has already
2855 * been updated.
2856 */
2857 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2858 rt->rt6i_pmtu = arg->mtu;
2859 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2860 (dst_mtu(&rt->dst) < arg->mtu &&
2861 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2862 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2863 }
2864 }
2865 return 0;
2866 }
2867
2868 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2869 {
2870 struct rt6_mtu_change_arg arg = {
2871 .dev = dev,
2872 .mtu = mtu,
2873 };
2874
2875 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2876 }
2877
2878 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2879 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2880 [RTA_OIF] = { .type = NLA_U32 },
2881 [RTA_IIF] = { .type = NLA_U32 },
2882 [RTA_PRIORITY] = { .type = NLA_U32 },
2883 [RTA_METRICS] = { .type = NLA_NESTED },
2884 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2885 [RTA_PREF] = { .type = NLA_U8 },
2886 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2887 [RTA_ENCAP] = { .type = NLA_NESTED },
2888 [RTA_EXPIRES] = { .type = NLA_U32 },
2889 [RTA_UID] = { .type = NLA_U32 },
2890 [RTA_MARK] = { .type = NLA_U32 },
2891 };
2892
2893 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2894 struct fib6_config *cfg,
2895 struct netlink_ext_ack *extack)
2896 {
2897 struct rtmsg *rtm;
2898 struct nlattr *tb[RTA_MAX+1];
2899 unsigned int pref;
2900 int err;
2901
2902 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
2903 NULL);
2904 if (err < 0)
2905 goto errout;
2906
2907 err = -EINVAL;
2908 rtm = nlmsg_data(nlh);
2909 memset(cfg, 0, sizeof(*cfg));
2910
2911 cfg->fc_table = rtm->rtm_table;
2912 cfg->fc_dst_len = rtm->rtm_dst_len;
2913 cfg->fc_src_len = rtm->rtm_src_len;
2914 cfg->fc_flags = RTF_UP;
2915 cfg->fc_protocol = rtm->rtm_protocol;
2916 cfg->fc_type = rtm->rtm_type;
2917
2918 if (rtm->rtm_type == RTN_UNREACHABLE ||
2919 rtm->rtm_type == RTN_BLACKHOLE ||
2920 rtm->rtm_type == RTN_PROHIBIT ||
2921 rtm->rtm_type == RTN_THROW)
2922 cfg->fc_flags |= RTF_REJECT;
2923
2924 if (rtm->rtm_type == RTN_LOCAL)
2925 cfg->fc_flags |= RTF_LOCAL;
2926
2927 if (rtm->rtm_flags & RTM_F_CLONED)
2928 cfg->fc_flags |= RTF_CACHE;
2929
2930 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2931 cfg->fc_nlinfo.nlh = nlh;
2932 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2933
2934 if (tb[RTA_GATEWAY]) {
2935 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2936 cfg->fc_flags |= RTF_GATEWAY;
2937 }
2938
2939 if (tb[RTA_DST]) {
2940 int plen = (rtm->rtm_dst_len + 7) >> 3;
2941
2942 if (nla_len(tb[RTA_DST]) < plen)
2943 goto errout;
2944
2945 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2946 }
2947
2948 if (tb[RTA_SRC]) {
2949 int plen = (rtm->rtm_src_len + 7) >> 3;
2950
2951 if (nla_len(tb[RTA_SRC]) < plen)
2952 goto errout;
2953
2954 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2955 }
2956
2957 if (tb[RTA_PREFSRC])
2958 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2959
2960 if (tb[RTA_OIF])
2961 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2962
2963 if (tb[RTA_PRIORITY])
2964 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2965
2966 if (tb[RTA_METRICS]) {
2967 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2968 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2969 }
2970
2971 if (tb[RTA_TABLE])
2972 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2973
2974 if (tb[RTA_MULTIPATH]) {
2975 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2976 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2977
2978 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
2979 cfg->fc_mp_len, extack);
2980 if (err < 0)
2981 goto errout;
2982 }
2983
2984 if (tb[RTA_PREF]) {
2985 pref = nla_get_u8(tb[RTA_PREF]);
2986 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2987 pref != ICMPV6_ROUTER_PREF_HIGH)
2988 pref = ICMPV6_ROUTER_PREF_MEDIUM;
2989 cfg->fc_flags |= RTF_PREF(pref);
2990 }
2991
2992 if (tb[RTA_ENCAP])
2993 cfg->fc_encap = tb[RTA_ENCAP];
2994
2995 if (tb[RTA_ENCAP_TYPE]) {
2996 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
2997
2998 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
2999 if (err < 0)
3000 goto errout;
3001 }
3002
3003 if (tb[RTA_EXPIRES]) {
3004 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
3005
3006 if (addrconf_finite_timeout(timeout)) {
3007 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
3008 cfg->fc_flags |= RTF_EXPIRES;
3009 }
3010 }
3011
3012 err = 0;
3013 errout:
3014 return err;
3015 }
3016
3017 struct rt6_nh {
3018 struct rt6_info *rt6_info;
3019 struct fib6_config r_cfg;
3020 struct mx6_config mxc;
3021 struct list_head next;
3022 };
3023
3024 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
3025 {
3026 struct rt6_nh *nh;
3027
3028 list_for_each_entry(nh, rt6_nh_list, next) {
3029 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n",
3030 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
3031 nh->r_cfg.fc_ifindex);
3032 }
3033 }
3034
3035 static int ip6_route_info_append(struct list_head *rt6_nh_list,
3036 struct rt6_info *rt, struct fib6_config *r_cfg)
3037 {
3038 struct rt6_nh *nh;
3039 int err = -EEXIST;
3040
3041 list_for_each_entry(nh, rt6_nh_list, next) {
3042 /* check if rt6_info already exists */
3043 if (rt6_duplicate_nexthop(nh->rt6_info, rt))
3044 return err;
3045 }
3046
3047 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
3048 if (!nh)
3049 return -ENOMEM;
3050 nh->rt6_info = rt;
3051 err = ip6_convert_metrics(&nh->mxc, r_cfg);
3052 if (err) {
3053 kfree(nh);
3054 return err;
3055 }
3056 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
3057 list_add_tail(&nh->next, rt6_nh_list);
3058
3059 return 0;
3060 }
3061
3062 static void ip6_route_mpath_notify(struct rt6_info *rt,
3063 struct rt6_info *rt_last,
3064 struct nl_info *info,
3065 __u16 nlflags)
3066 {
3067 /* if this is an APPEND route, then rt points to the first route
3068 * inserted and rt_last points to last route inserted. Userspace
3069 * wants a consistent dump of the route which starts at the first
3070 * nexthop. Since sibling routes are always added at the end of
3071 * the list, find the first sibling of the last route appended
3072 */
3073 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) {
3074 rt = list_first_entry(&rt_last->rt6i_siblings,
3075 struct rt6_info,
3076 rt6i_siblings);
3077 }
3078
3079 if (rt)
3080 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
3081 }
3082
3083 static int ip6_route_multipath_add(struct fib6_config *cfg,
3084 struct netlink_ext_ack *extack)
3085 {
3086 struct rt6_info *rt_notif = NULL, *rt_last = NULL;
3087 struct nl_info *info = &cfg->fc_nlinfo;
3088 struct fib6_config r_cfg;
3089 struct rtnexthop *rtnh;
3090 struct rt6_info *rt;
3091 struct rt6_nh *err_nh;
3092 struct rt6_nh *nh, *nh_safe;
3093 __u16 nlflags;
3094 int remaining;
3095 int attrlen;
3096 int err = 1;
3097 int nhn = 0;
3098 int replace = (cfg->fc_nlinfo.nlh &&
3099 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
3100 LIST_HEAD(rt6_nh_list);
3101
3102 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
3103 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
3104 nlflags |= NLM_F_APPEND;
3105
3106 remaining = cfg->fc_mp_len;
3107 rtnh = (struct rtnexthop *)cfg->fc_mp;
3108
3109 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
3110 * rt6_info structs per nexthop
3111 */
3112 while (rtnh_ok(rtnh, remaining)) {
3113 memcpy(&r_cfg, cfg, sizeof(*cfg));
3114 if (rtnh->rtnh_ifindex)
3115 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3116
3117 attrlen = rtnh_attrlen(rtnh);
3118 if (attrlen > 0) {
3119 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3120
3121 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3122 if (nla) {
3123 r_cfg.fc_gateway = nla_get_in6_addr(nla);
3124 r_cfg.fc_flags |= RTF_GATEWAY;
3125 }
3126 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
3127 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
3128 if (nla)
3129 r_cfg.fc_encap_type = nla_get_u16(nla);
3130 }
3131
3132 rt = ip6_route_info_create(&r_cfg, extack);
3133 if (IS_ERR(rt)) {
3134 err = PTR_ERR(rt);
3135 rt = NULL;
3136 goto cleanup;
3137 }
3138
3139 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
3140 if (err) {
3141 dst_release_immediate(&rt->dst);
3142 goto cleanup;
3143 }
3144
3145 rtnh = rtnh_next(rtnh, &remaining);
3146 }
3147
3148 /* for add and replace send one notification with all nexthops.
3149 * Skip the notification in fib6_add_rt2node and send one with
3150 * the full route when done
3151 */
3152 info->skip_notify = 1;
3153
3154 err_nh = NULL;
3155 list_for_each_entry(nh, &rt6_nh_list, next) {
3156 rt_last = nh->rt6_info;
3157 err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc, extack);
3158 /* save reference to first route for notification */
3159 if (!rt_notif && !err)
3160 rt_notif = nh->rt6_info;
3161
3162 /* nh->rt6_info is used or freed at this point, reset to NULL*/
3163 nh->rt6_info = NULL;
3164 if (err) {
3165 if (replace && nhn)
3166 ip6_print_replace_route_err(&rt6_nh_list);
3167 err_nh = nh;
3168 goto add_errout;
3169 }
3170
3171 /* Because each route is added like a single route we remove
3172 * these flags after the first nexthop: if there is a collision,
3173 * we have already failed to add the first nexthop:
3174 * fib6_add_rt2node() has rejected it; when replacing, old
3175 * nexthops have been replaced by first new, the rest should
3176 * be added to it.
3177 */
3178 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3179 NLM_F_REPLACE);
3180 nhn++;
3181 }
3182
3183 /* success ... tell user about new route */
3184 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
3185 goto cleanup;
3186
3187 add_errout:
3188 /* send notification for routes that were added so that
3189 * the delete notifications sent by ip6_route_del are
3190 * coherent
3191 */
3192 if (rt_notif)
3193 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
3194
3195 /* Delete routes that were already added */
3196 list_for_each_entry(nh, &rt6_nh_list, next) {
3197 if (err_nh == nh)
3198 break;
3199 ip6_route_del(&nh->r_cfg, extack);
3200 }
3201
3202 cleanup:
3203 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3204 if (nh->rt6_info)
3205 dst_release_immediate(&nh->rt6_info->dst);
3206 kfree(nh->mxc.mx);
3207 list_del(&nh->next);
3208 kfree(nh);
3209 }
3210
3211 return err;
3212 }
3213
3214 static int ip6_route_multipath_del(struct fib6_config *cfg,
3215 struct netlink_ext_ack *extack)
3216 {
3217 struct fib6_config r_cfg;
3218 struct rtnexthop *rtnh;
3219 int remaining;
3220 int attrlen;
3221 int err = 1, last_err = 0;
3222
3223 remaining = cfg->fc_mp_len;
3224 rtnh = (struct rtnexthop *)cfg->fc_mp;
3225
3226 /* Parse a Multipath Entry */
3227 while (rtnh_ok(rtnh, remaining)) {
3228 memcpy(&r_cfg, cfg, sizeof(*cfg));
3229 if (rtnh->rtnh_ifindex)
3230 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3231
3232 attrlen = rtnh_attrlen(rtnh);
3233 if (attrlen > 0) {
3234 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3235
3236 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3237 if (nla) {
3238 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3239 r_cfg.fc_flags |= RTF_GATEWAY;
3240 }
3241 }
3242 err = ip6_route_del(&r_cfg, extack);
3243 if (err)
3244 last_err = err;
3245
3246 rtnh = rtnh_next(rtnh, &remaining);
3247 }
3248
3249 return last_err;
3250 }
3251
3252 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
3253 struct netlink_ext_ack *extack)
3254 {
3255 struct fib6_config cfg;
3256 int err;
3257
3258 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
3259 if (err < 0)
3260 return err;
3261
3262 if (cfg.fc_mp)
3263 return ip6_route_multipath_del(&cfg, extack);
3264 else {
3265 cfg.fc_delete_all_nh = 1;
3266 return ip6_route_del(&cfg, extack);
3267 }
3268 }
3269
3270 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
3271 struct netlink_ext_ack *extack)
3272 {
3273 struct fib6_config cfg;
3274 int err;
3275
3276 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
3277 if (err < 0)
3278 return err;
3279
3280 if (cfg.fc_mp)
3281 return ip6_route_multipath_add(&cfg, extack);
3282 else
3283 return ip6_route_add(&cfg, extack);
3284 }
3285
3286 static size_t rt6_nlmsg_size(struct rt6_info *rt)
3287 {
3288 int nexthop_len = 0;
3289
3290 if (rt->rt6i_nsiblings) {
3291 nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
3292 + NLA_ALIGN(sizeof(struct rtnexthop))
3293 + nla_total_size(16) /* RTA_GATEWAY */
3294 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3295
3296 nexthop_len *= rt->rt6i_nsiblings;
3297 }
3298
3299 return NLMSG_ALIGN(sizeof(struct rtmsg))
3300 + nla_total_size(16) /* RTA_SRC */
3301 + nla_total_size(16) /* RTA_DST */
3302 + nla_total_size(16) /* RTA_GATEWAY */
3303 + nla_total_size(16) /* RTA_PREFSRC */
3304 + nla_total_size(4) /* RTA_TABLE */
3305 + nla_total_size(4) /* RTA_IIF */
3306 + nla_total_size(4) /* RTA_OIF */
3307 + nla_total_size(4) /* RTA_PRIORITY */
3308 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3309 + nla_total_size(sizeof(struct rta_cacheinfo))
3310 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3311 + nla_total_size(1) /* RTA_PREF */
3312 + lwtunnel_get_encap_size(rt->dst.lwtstate)
3313 + nexthop_len;
3314 }
3315
3316 static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
3317 unsigned int *flags, bool skip_oif)
3318 {
3319 if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) {
3320 *flags |= RTNH_F_LINKDOWN;
3321 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3322 *flags |= RTNH_F_DEAD;
3323 }
3324
3325 if (rt->rt6i_flags & RTF_GATEWAY) {
3326 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3327 goto nla_put_failure;
3328 }
3329
3330 /* not needed for multipath encoding b/c it has a rtnexthop struct */
3331 if (!skip_oif && rt->dst.dev &&
3332 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3333 goto nla_put_failure;
3334
3335 if (rt->dst.lwtstate &&
3336 lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
3337 goto nla_put_failure;
3338
3339 return 0;
3340
3341 nla_put_failure:
3342 return -EMSGSIZE;
3343 }
3344
3345 /* add multipath next hop */
3346 static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
3347 {
3348 struct rtnexthop *rtnh;
3349 unsigned int flags = 0;
3350
3351 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
3352 if (!rtnh)
3353 goto nla_put_failure;
3354
3355 rtnh->rtnh_hops = 0;
3356 rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0;
3357
3358 if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
3359 goto nla_put_failure;
3360
3361 rtnh->rtnh_flags = flags;
3362
3363 /* length of rtnetlink header + attributes */
3364 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
3365
3366 return 0;
3367
3368 nla_put_failure:
3369 return -EMSGSIZE;
3370 }
3371
3372 static int rt6_fill_node(struct net *net,
3373 struct sk_buff *skb, struct rt6_info *rt,
3374 struct in6_addr *dst, struct in6_addr *src,
3375 int iif, int type, u32 portid, u32 seq,
3376 unsigned int flags)
3377 {
3378 u32 metrics[RTAX_MAX];
3379 struct rtmsg *rtm;
3380 struct nlmsghdr *nlh;
3381 long expires;
3382 u32 table;
3383
3384 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3385 if (!nlh)
3386 return -EMSGSIZE;
3387
3388 rtm = nlmsg_data(nlh);
3389 rtm->rtm_family = AF_INET6;
3390 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3391 rtm->rtm_src_len = rt->rt6i_src.plen;
3392 rtm->rtm_tos = 0;
3393 if (rt->rt6i_table)
3394 table = rt->rt6i_table->tb6_id;
3395 else
3396 table = RT6_TABLE_UNSPEC;
3397 rtm->rtm_table = table;
3398 if (nla_put_u32(skb, RTA_TABLE, table))
3399 goto nla_put_failure;
3400 if (rt->rt6i_flags & RTF_REJECT) {
3401 switch (rt->dst.error) {
3402 case -EINVAL:
3403 rtm->rtm_type = RTN_BLACKHOLE;
3404 break;
3405 case -EACCES:
3406 rtm->rtm_type = RTN_PROHIBIT;
3407 break;
3408 case -EAGAIN:
3409 rtm->rtm_type = RTN_THROW;
3410 break;
3411 default:
3412 rtm->rtm_type = RTN_UNREACHABLE;
3413 break;
3414 }
3415 }
3416 else if (rt->rt6i_flags & RTF_LOCAL)
3417 rtm->rtm_type = RTN_LOCAL;
3418 else if (rt->rt6i_flags & RTF_ANYCAST)
3419 rtm->rtm_type = RTN_ANYCAST;
3420 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3421 rtm->rtm_type = RTN_LOCAL;
3422 else
3423 rtm->rtm_type = RTN_UNICAST;
3424 rtm->rtm_flags = 0;
3425 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3426 rtm->rtm_protocol = rt->rt6i_protocol;
3427 if (rt->rt6i_flags & RTF_DYNAMIC)
3428 rtm->rtm_protocol = RTPROT_REDIRECT;
3429 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3430 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3431 rtm->rtm_protocol = RTPROT_RA;
3432 else
3433 rtm->rtm_protocol = RTPROT_KERNEL;
3434 }
3435
3436 if (rt->rt6i_flags & RTF_CACHE)
3437 rtm->rtm_flags |= RTM_F_CLONED;
3438
3439 if (dst) {
3440 if (nla_put_in6_addr(skb, RTA_DST, dst))
3441 goto nla_put_failure;
3442 rtm->rtm_dst_len = 128;
3443 } else if (rtm->rtm_dst_len)
3444 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3445 goto nla_put_failure;
3446 #ifdef CONFIG_IPV6_SUBTREES
3447 if (src) {
3448 if (nla_put_in6_addr(skb, RTA_SRC, src))
3449 goto nla_put_failure;
3450 rtm->rtm_src_len = 128;
3451 } else if (rtm->rtm_src_len &&
3452 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3453 goto nla_put_failure;
3454 #endif
3455 if (iif) {
3456 #ifdef CONFIG_IPV6_MROUTE
3457 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3458 int err = ip6mr_get_route(net, skb, rtm, portid);
3459
3460 if (err == 0)
3461 return 0;
3462 if (err < 0)
3463 goto nla_put_failure;
3464 } else
3465 #endif
3466 if (nla_put_u32(skb, RTA_IIF, iif))
3467 goto nla_put_failure;
3468 } else if (dst) {
3469 struct in6_addr saddr_buf;
3470 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3471 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3472 goto nla_put_failure;
3473 }
3474
3475 if (rt->rt6i_prefsrc.plen) {
3476 struct in6_addr saddr_buf;
3477 saddr_buf = rt->rt6i_prefsrc.addr;
3478 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3479 goto nla_put_failure;
3480 }
3481
3482 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3483 if (rt->rt6i_pmtu)
3484 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3485 if (rtnetlink_put_metrics(skb, metrics) < 0)
3486 goto nla_put_failure;
3487
3488 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3489 goto nla_put_failure;
3490
3491 /* For multipath routes, walk the siblings list and add
3492 * each as a nexthop within RTA_MULTIPATH.
3493 */
3494 if (rt->rt6i_nsiblings) {
3495 struct rt6_info *sibling, *next_sibling;
3496 struct nlattr *mp;
3497
3498 mp = nla_nest_start(skb, RTA_MULTIPATH);
3499 if (!mp)
3500 goto nla_put_failure;
3501
3502 if (rt6_add_nexthop(skb, rt) < 0)
3503 goto nla_put_failure;
3504
3505 list_for_each_entry_safe(sibling, next_sibling,
3506 &rt->rt6i_siblings, rt6i_siblings) {
3507 if (rt6_add_nexthop(skb, sibling) < 0)
3508 goto nla_put_failure;
3509 }
3510
3511 nla_nest_end(skb, mp);
3512 } else {
3513 if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
3514 goto nla_put_failure;
3515 }
3516
3517 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3518
3519 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3520 goto nla_put_failure;
3521
3522 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3523 goto nla_put_failure;
3524
3525
3526 nlmsg_end(skb, nlh);
3527 return 0;
3528
3529 nla_put_failure:
3530 nlmsg_cancel(skb, nlh);
3531 return -EMSGSIZE;
3532 }
3533
3534 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3535 {
3536 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3537 struct net *net = arg->net;
3538
3539 if (rt == net->ipv6.ip6_null_entry)
3540 return 0;
3541
3542 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3543 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3544
3545 /* user wants prefix routes only */
3546 if (rtm->rtm_flags & RTM_F_PREFIX &&
3547 !(rt->rt6i_flags & RTF_PREFIX_RT)) {
3548 /* success since this is not a prefix route */
3549 return 1;
3550 }
3551 }
3552
3553 return rt6_fill_node(net,
3554 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3555 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3556 NLM_F_MULTI);
3557 }
3558
3559 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3560 struct netlink_ext_ack *extack)
3561 {
3562 struct net *net = sock_net(in_skb->sk);
3563 struct nlattr *tb[RTA_MAX+1];
3564 int err, iif = 0, oif = 0;
3565 struct dst_entry *dst;
3566 struct rt6_info *rt;
3567 struct sk_buff *skb;
3568 struct rtmsg *rtm;
3569 struct flowi6 fl6;
3570 bool fibmatch;
3571
3572 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
3573 extack);
3574 if (err < 0)
3575 goto errout;
3576
3577 err = -EINVAL;
3578 memset(&fl6, 0, sizeof(fl6));
3579 rtm = nlmsg_data(nlh);
3580 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
3581 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
3582
3583 if (tb[RTA_SRC]) {
3584 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3585 goto errout;
3586
3587 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3588 }
3589
3590 if (tb[RTA_DST]) {
3591 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3592 goto errout;
3593
3594 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3595 }
3596
3597 if (tb[RTA_IIF])
3598 iif = nla_get_u32(tb[RTA_IIF]);
3599
3600 if (tb[RTA_OIF])
3601 oif = nla_get_u32(tb[RTA_OIF]);
3602
3603 if (tb[RTA_MARK])
3604 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3605
3606 if (tb[RTA_UID])
3607 fl6.flowi6_uid = make_kuid(current_user_ns(),
3608 nla_get_u32(tb[RTA_UID]));
3609 else
3610 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3611
3612 if (iif) {
3613 struct net_device *dev;
3614 int flags = 0;
3615
3616 dev = __dev_get_by_index(net, iif);
3617 if (!dev) {
3618 err = -ENODEV;
3619 goto errout;
3620 }
3621
3622 fl6.flowi6_iif = iif;
3623
3624 if (!ipv6_addr_any(&fl6.saddr))
3625 flags |= RT6_LOOKUP_F_HAS_SADDR;
3626
3627 if (!fibmatch)
3628 dst = ip6_route_input_lookup(net, dev, &fl6, flags);
3629 } else {
3630 fl6.flowi6_oif = oif;
3631
3632 if (!fibmatch)
3633 dst = ip6_route_output(net, NULL, &fl6);
3634 }
3635
3636 if (fibmatch)
3637 dst = ip6_route_lookup(net, &fl6, 0);
3638
3639 rt = container_of(dst, struct rt6_info, dst);
3640 if (rt->dst.error) {
3641 err = rt->dst.error;
3642 ip6_rt_put(rt);
3643 goto errout;
3644 }
3645
3646 if (rt == net->ipv6.ip6_null_entry) {
3647 err = rt->dst.error;
3648 ip6_rt_put(rt);
3649 goto errout;
3650 }
3651
3652 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3653 if (!skb) {
3654 ip6_rt_put(rt);
3655 err = -ENOBUFS;
3656 goto errout;
3657 }
3658
3659 skb_dst_set(skb, &rt->dst);
3660 if (fibmatch)
3661 err = rt6_fill_node(net, skb, rt, NULL, NULL, iif,
3662 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3663 nlh->nlmsg_seq, 0);
3664 else
3665 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3666 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3667 nlh->nlmsg_seq, 0);
3668 if (err < 0) {
3669 kfree_skb(skb);
3670 goto errout;
3671 }
3672
3673 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3674 errout:
3675 return err;
3676 }
3677
3678 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3679 unsigned int nlm_flags)
3680 {
3681 struct sk_buff *skb;
3682 struct net *net = info->nl_net;
3683 u32 seq;
3684 int err;
3685
3686 err = -ENOBUFS;
3687 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3688
3689 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3690 if (!skb)
3691 goto errout;
3692
3693 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3694 event, info->portid, seq, nlm_flags);
3695 if (err < 0) {
3696 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3697 WARN_ON(err == -EMSGSIZE);
3698 kfree_skb(skb);
3699 goto errout;
3700 }
3701 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3702 info->nlh, gfp_any());
3703 return;
3704 errout:
3705 if (err < 0)
3706 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3707 }
3708
3709 static int ip6_route_dev_notify(struct notifier_block *this,
3710 unsigned long event, void *ptr)
3711 {
3712 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3713 struct net *net = dev_net(dev);
3714
3715 if (!(dev->flags & IFF_LOOPBACK))
3716 return NOTIFY_OK;
3717
3718 if (event == NETDEV_REGISTER) {
3719 net->ipv6.ip6_null_entry->dst.dev = dev;
3720 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3721 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3722 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3723 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3724 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3725 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3726 #endif
3727 } else if (event == NETDEV_UNREGISTER &&
3728 dev->reg_state != NETREG_UNREGISTERED) {
3729 /* NETDEV_UNREGISTER could be fired for multiple times by
3730 * netdev_wait_allrefs(). Make sure we only call this once.
3731 */
3732 in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev);
3733 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3734 in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev);
3735 in6_dev_put(net->ipv6.ip6_blk_hole_entry->rt6i_idev);
3736 #endif
3737 }
3738
3739 return NOTIFY_OK;
3740 }
3741
3742 /*
3743 * /proc
3744 */
3745
3746 #ifdef CONFIG_PROC_FS
3747
3748 static const struct file_operations ipv6_route_proc_fops = {
3749 .owner = THIS_MODULE,
3750 .open = ipv6_route_open,
3751 .read = seq_read,
3752 .llseek = seq_lseek,
3753 .release = seq_release_net,
3754 };
3755
3756 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3757 {
3758 struct net *net = (struct net *)seq->private;
3759 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3760 net->ipv6.rt6_stats->fib_nodes,
3761 net->ipv6.rt6_stats->fib_route_nodes,
3762 net->ipv6.rt6_stats->fib_rt_alloc,
3763 net->ipv6.rt6_stats->fib_rt_entries,
3764 net->ipv6.rt6_stats->fib_rt_cache,
3765 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3766 net->ipv6.rt6_stats->fib_discarded_routes);
3767
3768 return 0;
3769 }
3770
3771 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3772 {
3773 return single_open_net(inode, file, rt6_stats_seq_show);
3774 }
3775
3776 static const struct file_operations rt6_stats_seq_fops = {
3777 .owner = THIS_MODULE,
3778 .open = rt6_stats_seq_open,
3779 .read = seq_read,
3780 .llseek = seq_lseek,
3781 .release = single_release_net,
3782 };
3783 #endif /* CONFIG_PROC_FS */
3784
3785 #ifdef CONFIG_SYSCTL
3786
3787 static
3788 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3789 void __user *buffer, size_t *lenp, loff_t *ppos)
3790 {
3791 struct net *net;
3792 int delay;
3793 if (!write)
3794 return -EINVAL;
3795
3796 net = (struct net *)ctl->extra1;
3797 delay = net->ipv6.sysctl.flush_delay;
3798 proc_dointvec(ctl, write, buffer, lenp, ppos);
3799 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3800 return 0;
3801 }
3802
3803 struct ctl_table ipv6_route_table_template[] = {
3804 {
3805 .procname = "flush",
3806 .data = &init_net.ipv6.sysctl.flush_delay,
3807 .maxlen = sizeof(int),
3808 .mode = 0200,
3809 .proc_handler = ipv6_sysctl_rtcache_flush
3810 },
3811 {
3812 .procname = "gc_thresh",
3813 .data = &ip6_dst_ops_template.gc_thresh,
3814 .maxlen = sizeof(int),
3815 .mode = 0644,
3816 .proc_handler = proc_dointvec,
3817 },
3818 {
3819 .procname = "max_size",
3820 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3821 .maxlen = sizeof(int),
3822 .mode = 0644,
3823 .proc_handler = proc_dointvec,
3824 },
3825 {
3826 .procname = "gc_min_interval",
3827 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3828 .maxlen = sizeof(int),
3829 .mode = 0644,
3830 .proc_handler = proc_dointvec_jiffies,
3831 },
3832 {
3833 .procname = "gc_timeout",
3834 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3835 .maxlen = sizeof(int),
3836 .mode = 0644,
3837 .proc_handler = proc_dointvec_jiffies,
3838 },
3839 {
3840 .procname = "gc_interval",
3841 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3842 .maxlen = sizeof(int),
3843 .mode = 0644,
3844 .proc_handler = proc_dointvec_jiffies,
3845 },
3846 {
3847 .procname = "gc_elasticity",
3848 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3849 .maxlen = sizeof(int),
3850 .mode = 0644,
3851 .proc_handler = proc_dointvec,
3852 },
3853 {
3854 .procname = "mtu_expires",
3855 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3856 .maxlen = sizeof(int),
3857 .mode = 0644,
3858 .proc_handler = proc_dointvec_jiffies,
3859 },
3860 {
3861 .procname = "min_adv_mss",
3862 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3863 .maxlen = sizeof(int),
3864 .mode = 0644,
3865 .proc_handler = proc_dointvec,
3866 },
3867 {
3868 .procname = "gc_min_interval_ms",
3869 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3870 .maxlen = sizeof(int),
3871 .mode = 0644,
3872 .proc_handler = proc_dointvec_ms_jiffies,
3873 },
3874 { }
3875 };
3876
3877 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3878 {
3879 struct ctl_table *table;
3880
3881 table = kmemdup(ipv6_route_table_template,
3882 sizeof(ipv6_route_table_template),
3883 GFP_KERNEL);
3884
3885 if (table) {
3886 table[0].data = &net->ipv6.sysctl.flush_delay;
3887 table[0].extra1 = net;
3888 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3889 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3890 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3891 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3892 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3893 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3894 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3895 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3896 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3897
3898 /* Don't export sysctls to unprivileged users */
3899 if (net->user_ns != &init_user_ns)
3900 table[0].procname = NULL;
3901 }
3902
3903 return table;
3904 }
3905 #endif
3906
3907 static int __net_init ip6_route_net_init(struct net *net)
3908 {
3909 int ret = -ENOMEM;
3910
3911 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3912 sizeof(net->ipv6.ip6_dst_ops));
3913
3914 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3915 goto out_ip6_dst_ops;
3916
3917 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3918 sizeof(*net->ipv6.ip6_null_entry),
3919 GFP_KERNEL);
3920 if (!net->ipv6.ip6_null_entry)
3921 goto out_ip6_dst_entries;
3922 net->ipv6.ip6_null_entry->dst.path =
3923 (struct dst_entry *)net->ipv6.ip6_null_entry;
3924 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3925 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3926 ip6_template_metrics, true);
3927
3928 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3929 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3930 sizeof(*net->ipv6.ip6_prohibit_entry),
3931 GFP_KERNEL);
3932 if (!net->ipv6.ip6_prohibit_entry)
3933 goto out_ip6_null_entry;
3934 net->ipv6.ip6_prohibit_entry->dst.path =
3935 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3936 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3937 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3938 ip6_template_metrics, true);
3939
3940 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3941 sizeof(*net->ipv6.ip6_blk_hole_entry),
3942 GFP_KERNEL);
3943 if (!net->ipv6.ip6_blk_hole_entry)
3944 goto out_ip6_prohibit_entry;
3945 net->ipv6.ip6_blk_hole_entry->dst.path =
3946 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3947 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3948 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3949 ip6_template_metrics, true);
3950 #endif
3951
3952 net->ipv6.sysctl.flush_delay = 0;
3953 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3954 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3955 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3956 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3957 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3958 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3959 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3960
3961 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3962
3963 ret = 0;
3964 out:
3965 return ret;
3966
3967 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3968 out_ip6_prohibit_entry:
3969 kfree(net->ipv6.ip6_prohibit_entry);
3970 out_ip6_null_entry:
3971 kfree(net->ipv6.ip6_null_entry);
3972 #endif
3973 out_ip6_dst_entries:
3974 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3975 out_ip6_dst_ops:
3976 goto out;
3977 }
3978
3979 static void __net_exit ip6_route_net_exit(struct net *net)
3980 {
3981 kfree(net->ipv6.ip6_null_entry);
3982 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3983 kfree(net->ipv6.ip6_prohibit_entry);
3984 kfree(net->ipv6.ip6_blk_hole_entry);
3985 #endif
3986 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3987 }
3988
3989 static int __net_init ip6_route_net_init_late(struct net *net)
3990 {
3991 #ifdef CONFIG_PROC_FS
3992 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3993 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3994 #endif
3995 return 0;
3996 }
3997
3998 static void __net_exit ip6_route_net_exit_late(struct net *net)
3999 {
4000 #ifdef CONFIG_PROC_FS
4001 remove_proc_entry("ipv6_route", net->proc_net);
4002 remove_proc_entry("rt6_stats", net->proc_net);
4003 #endif
4004 }
4005
4006 static struct pernet_operations ip6_route_net_ops = {
4007 .init = ip6_route_net_init,
4008 .exit = ip6_route_net_exit,
4009 };
4010
4011 static int __net_init ipv6_inetpeer_init(struct net *net)
4012 {
4013 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
4014
4015 if (!bp)
4016 return -ENOMEM;
4017 inet_peer_base_init(bp);
4018 net->ipv6.peers = bp;
4019 return 0;
4020 }
4021
4022 static void __net_exit ipv6_inetpeer_exit(struct net *net)
4023 {
4024 struct inet_peer_base *bp = net->ipv6.peers;
4025
4026 net->ipv6.peers = NULL;
4027 inetpeer_invalidate_tree(bp);
4028 kfree(bp);
4029 }
4030
4031 static struct pernet_operations ipv6_inetpeer_ops = {
4032 .init = ipv6_inetpeer_init,
4033 .exit = ipv6_inetpeer_exit,
4034 };
4035
4036 static struct pernet_operations ip6_route_net_late_ops = {
4037 .init = ip6_route_net_init_late,
4038 .exit = ip6_route_net_exit_late,
4039 };
4040
4041 static struct notifier_block ip6_route_dev_notifier = {
4042 .notifier_call = ip6_route_dev_notify,
4043 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
4044 };
4045
4046 void __init ip6_route_init_special_entries(void)
4047 {
4048 /* Registering of the loopback is done before this portion of code,
4049 * the loopback reference in rt6_info will not be taken, do it
4050 * manually for init_net */
4051 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
4052 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4053 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4054 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
4055 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4056 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
4057 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4058 #endif
4059 }
4060
4061 int __init ip6_route_init(void)
4062 {
4063 int ret;
4064 int cpu;
4065
4066 ret = -ENOMEM;
4067 ip6_dst_ops_template.kmem_cachep =
4068 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
4069 SLAB_HWCACHE_ALIGN, NULL);
4070 if (!ip6_dst_ops_template.kmem_cachep)
4071 goto out;
4072
4073 ret = dst_entries_init(&ip6_dst_blackhole_ops);
4074 if (ret)
4075 goto out_kmem_cache;
4076
4077 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
4078 if (ret)
4079 goto out_dst_entries;
4080
4081 ret = register_pernet_subsys(&ip6_route_net_ops);
4082 if (ret)
4083 goto out_register_inetpeer;
4084
4085 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
4086
4087 ret = fib6_init();
4088 if (ret)
4089 goto out_register_subsys;
4090
4091 ret = xfrm6_init();
4092 if (ret)
4093 goto out_fib6_init;
4094
4095 ret = fib6_rules_init();
4096 if (ret)
4097 goto xfrm6_init;
4098
4099 ret = register_pernet_subsys(&ip6_route_net_late_ops);
4100 if (ret)
4101 goto fib6_rules_init;
4102
4103 ret = -ENOBUFS;
4104 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
4105 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
4106 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
4107 goto out_register_late_subsys;
4108
4109 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
4110 if (ret)
4111 goto out_register_late_subsys;
4112
4113 for_each_possible_cpu(cpu) {
4114 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
4115
4116 INIT_LIST_HEAD(&ul->head);
4117 spin_lock_init(&ul->lock);
4118 }
4119
4120 out:
4121 return ret;
4122
4123 out_register_late_subsys:
4124 unregister_pernet_subsys(&ip6_route_net_late_ops);
4125 fib6_rules_init:
4126 fib6_rules_cleanup();
4127 xfrm6_init:
4128 xfrm6_fini();
4129 out_fib6_init:
4130 fib6_gc_cleanup();
4131 out_register_subsys:
4132 unregister_pernet_subsys(&ip6_route_net_ops);
4133 out_register_inetpeer:
4134 unregister_pernet_subsys(&ipv6_inetpeer_ops);
4135 out_dst_entries:
4136 dst_entries_destroy(&ip6_dst_blackhole_ops);
4137 out_kmem_cache:
4138 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
4139 goto out;
4140 }
4141
4142 void ip6_route_cleanup(void)
4143 {
4144 unregister_netdevice_notifier(&ip6_route_dev_notifier);
4145 unregister_pernet_subsys(&ip6_route_net_late_ops);
4146 fib6_rules_cleanup();
4147 xfrm6_fini();
4148 fib6_gc_cleanup();
4149 unregister_pernet_subsys(&ipv6_inetpeer_ops);
4150 unregister_pernet_subsys(&ip6_route_net_ops);
4151 dst_entries_destroy(&ip6_dst_blackhole_ops);
4152 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
4153 }
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