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ipv6: initialize route null entry in addrconf_init()
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / route.c
1 /*
2 * Linux INET6 implementation
3 * FIB front-end.
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 */
13
14 /* Changes:
15 *
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
23 * Ville Nuorvala
24 * Fixed routing subtrees.
25 */
26
27 #define pr_fmt(fmt) "IPv6: " fmt
28
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
48 #include <net/snmp.h>
49 #include <net/ipv6.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
54 #include <net/tcp.h>
55 #include <linux/rtnetlink.h>
56 #include <net/dst.h>
57 #include <net/dst_metadata.h>
58 #include <net/xfrm.h>
59 #include <net/netevent.h>
60 #include <net/netlink.h>
61 #include <net/nexthop.h>
62 #include <net/lwtunnel.h>
63 #include <net/ip_tunnels.h>
64 #include <net/l3mdev.h>
65 #include <trace/events/fib6.h>
66
67 #include <linux/uaccess.h>
68
69 #ifdef CONFIG_SYSCTL
70 #include <linux/sysctl.h>
71 #endif
72
73 enum rt6_nud_state {
74 RT6_NUD_FAIL_HARD = -3,
75 RT6_NUD_FAIL_PROBE = -2,
76 RT6_NUD_FAIL_DO_RR = -1,
77 RT6_NUD_SUCCEED = 1
78 };
79
80 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
81 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
82 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
83 static unsigned int ip6_mtu(const struct dst_entry *dst);
84 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
85 static void ip6_dst_destroy(struct dst_entry *);
86 static void ip6_dst_ifdown(struct dst_entry *,
87 struct net_device *dev, int how);
88 static int ip6_dst_gc(struct dst_ops *ops);
89
90 static int ip6_pkt_discard(struct sk_buff *skb);
91 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
92 static int ip6_pkt_prohibit(struct sk_buff *skb);
93 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
94 static void ip6_link_failure(struct sk_buff *skb);
95 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
96 struct sk_buff *skb, u32 mtu);
97 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb);
99 static void rt6_dst_from_metrics_check(struct rt6_info *rt);
100 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
101 static size_t rt6_nlmsg_size(struct rt6_info *rt);
102 static int rt6_fill_node(struct net *net,
103 struct sk_buff *skb, struct rt6_info *rt,
104 struct in6_addr *dst, struct in6_addr *src,
105 int iif, int type, u32 portid, u32 seq,
106 unsigned int flags);
107
108 #ifdef CONFIG_IPV6_ROUTE_INFO
109 static struct rt6_info *rt6_add_route_info(struct net *net,
110 const struct in6_addr *prefix, int prefixlen,
111 const struct in6_addr *gwaddr,
112 struct net_device *dev,
113 unsigned int pref);
114 static struct rt6_info *rt6_get_route_info(struct net *net,
115 const struct in6_addr *prefix, int prefixlen,
116 const struct in6_addr *gwaddr,
117 struct net_device *dev);
118 #endif
119
120 struct uncached_list {
121 spinlock_t lock;
122 struct list_head head;
123 };
124
125 static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
126
127 static void rt6_uncached_list_add(struct rt6_info *rt)
128 {
129 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
130
131 rt->dst.flags |= DST_NOCACHE;
132 rt->rt6i_uncached_list = ul;
133
134 spin_lock_bh(&ul->lock);
135 list_add_tail(&rt->rt6i_uncached, &ul->head);
136 spin_unlock_bh(&ul->lock);
137 }
138
139 static void rt6_uncached_list_del(struct rt6_info *rt)
140 {
141 if (!list_empty(&rt->rt6i_uncached)) {
142 struct uncached_list *ul = rt->rt6i_uncached_list;
143
144 spin_lock_bh(&ul->lock);
145 list_del(&rt->rt6i_uncached);
146 spin_unlock_bh(&ul->lock);
147 }
148 }
149
150 static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
151 {
152 struct net_device *loopback_dev = net->loopback_dev;
153 int cpu;
154
155 if (dev == loopback_dev)
156 return;
157
158 for_each_possible_cpu(cpu) {
159 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
160 struct rt6_info *rt;
161
162 spin_lock_bh(&ul->lock);
163 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
164 struct inet6_dev *rt_idev = rt->rt6i_idev;
165 struct net_device *rt_dev = rt->dst.dev;
166
167 if (rt_idev->dev == dev) {
168 rt->rt6i_idev = in6_dev_get(loopback_dev);
169 in6_dev_put(rt_idev);
170 }
171
172 if (rt_dev == dev) {
173 rt->dst.dev = loopback_dev;
174 dev_hold(rt->dst.dev);
175 dev_put(rt_dev);
176 }
177 }
178 spin_unlock_bh(&ul->lock);
179 }
180 }
181
182 static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
183 {
184 return dst_metrics_write_ptr(rt->dst.from);
185 }
186
187 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
188 {
189 struct rt6_info *rt = (struct rt6_info *)dst;
190
191 if (rt->rt6i_flags & RTF_PCPU)
192 return rt6_pcpu_cow_metrics(rt);
193 else if (rt->rt6i_flags & RTF_CACHE)
194 return NULL;
195 else
196 return dst_cow_metrics_generic(dst, old);
197 }
198
199 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
200 struct sk_buff *skb,
201 const void *daddr)
202 {
203 struct in6_addr *p = &rt->rt6i_gateway;
204
205 if (!ipv6_addr_any(p))
206 return (const void *) p;
207 else if (skb)
208 return &ipv6_hdr(skb)->daddr;
209 return daddr;
210 }
211
212 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
213 struct sk_buff *skb,
214 const void *daddr)
215 {
216 struct rt6_info *rt = (struct rt6_info *) dst;
217 struct neighbour *n;
218
219 daddr = choose_neigh_daddr(rt, skb, daddr);
220 n = __ipv6_neigh_lookup(dst->dev, daddr);
221 if (n)
222 return n;
223 return neigh_create(&nd_tbl, daddr, dst->dev);
224 }
225
226 static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
227 {
228 struct net_device *dev = dst->dev;
229 struct rt6_info *rt = (struct rt6_info *)dst;
230
231 daddr = choose_neigh_daddr(rt, NULL, daddr);
232 if (!daddr)
233 return;
234 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
235 return;
236 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
237 return;
238 __ipv6_confirm_neigh(dev, daddr);
239 }
240
241 static struct dst_ops ip6_dst_ops_template = {
242 .family = AF_INET6,
243 .gc = ip6_dst_gc,
244 .gc_thresh = 1024,
245 .check = ip6_dst_check,
246 .default_advmss = ip6_default_advmss,
247 .mtu = ip6_mtu,
248 .cow_metrics = ipv6_cow_metrics,
249 .destroy = ip6_dst_destroy,
250 .ifdown = ip6_dst_ifdown,
251 .negative_advice = ip6_negative_advice,
252 .link_failure = ip6_link_failure,
253 .update_pmtu = ip6_rt_update_pmtu,
254 .redirect = rt6_do_redirect,
255 .local_out = __ip6_local_out,
256 .neigh_lookup = ip6_neigh_lookup,
257 .confirm_neigh = ip6_confirm_neigh,
258 };
259
260 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
261 {
262 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
263
264 return mtu ? : dst->dev->mtu;
265 }
266
267 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
268 struct sk_buff *skb, u32 mtu)
269 {
270 }
271
272 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
273 struct sk_buff *skb)
274 {
275 }
276
277 static struct dst_ops ip6_dst_blackhole_ops = {
278 .family = AF_INET6,
279 .destroy = ip6_dst_destroy,
280 .check = ip6_dst_check,
281 .mtu = ip6_blackhole_mtu,
282 .default_advmss = ip6_default_advmss,
283 .update_pmtu = ip6_rt_blackhole_update_pmtu,
284 .redirect = ip6_rt_blackhole_redirect,
285 .cow_metrics = dst_cow_metrics_generic,
286 .neigh_lookup = ip6_neigh_lookup,
287 };
288
289 static const u32 ip6_template_metrics[RTAX_MAX] = {
290 [RTAX_HOPLIMIT - 1] = 0,
291 };
292
293 static const struct rt6_info ip6_null_entry_template = {
294 .dst = {
295 .__refcnt = ATOMIC_INIT(1),
296 .__use = 1,
297 .obsolete = DST_OBSOLETE_FORCE_CHK,
298 .error = -ENETUNREACH,
299 .input = ip6_pkt_discard,
300 .output = ip6_pkt_discard_out,
301 },
302 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
303 .rt6i_protocol = RTPROT_KERNEL,
304 .rt6i_metric = ~(u32) 0,
305 .rt6i_ref = ATOMIC_INIT(1),
306 };
307
308 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
309
310 static const struct rt6_info ip6_prohibit_entry_template = {
311 .dst = {
312 .__refcnt = ATOMIC_INIT(1),
313 .__use = 1,
314 .obsolete = DST_OBSOLETE_FORCE_CHK,
315 .error = -EACCES,
316 .input = ip6_pkt_prohibit,
317 .output = ip6_pkt_prohibit_out,
318 },
319 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
320 .rt6i_protocol = RTPROT_KERNEL,
321 .rt6i_metric = ~(u32) 0,
322 .rt6i_ref = ATOMIC_INIT(1),
323 };
324
325 static const struct rt6_info ip6_blk_hole_entry_template = {
326 .dst = {
327 .__refcnt = ATOMIC_INIT(1),
328 .__use = 1,
329 .obsolete = DST_OBSOLETE_FORCE_CHK,
330 .error = -EINVAL,
331 .input = dst_discard,
332 .output = dst_discard_out,
333 },
334 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
335 .rt6i_protocol = RTPROT_KERNEL,
336 .rt6i_metric = ~(u32) 0,
337 .rt6i_ref = ATOMIC_INIT(1),
338 };
339
340 #endif
341
342 static void rt6_info_init(struct rt6_info *rt)
343 {
344 struct dst_entry *dst = &rt->dst;
345
346 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
347 INIT_LIST_HEAD(&rt->rt6i_siblings);
348 INIT_LIST_HEAD(&rt->rt6i_uncached);
349 }
350
351 /* allocate dst with ip6_dst_ops */
352 static struct rt6_info *__ip6_dst_alloc(struct net *net,
353 struct net_device *dev,
354 int flags)
355 {
356 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
357 0, DST_OBSOLETE_FORCE_CHK, flags);
358
359 if (rt)
360 rt6_info_init(rt);
361
362 return rt;
363 }
364
365 struct rt6_info *ip6_dst_alloc(struct net *net,
366 struct net_device *dev,
367 int flags)
368 {
369 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
370
371 if (rt) {
372 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
373 if (rt->rt6i_pcpu) {
374 int cpu;
375
376 for_each_possible_cpu(cpu) {
377 struct rt6_info **p;
378
379 p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
380 /* no one shares rt */
381 *p = NULL;
382 }
383 } else {
384 dst_destroy((struct dst_entry *)rt);
385 return NULL;
386 }
387 }
388
389 return rt;
390 }
391 EXPORT_SYMBOL(ip6_dst_alloc);
392
393 static void ip6_dst_destroy(struct dst_entry *dst)
394 {
395 struct rt6_info *rt = (struct rt6_info *)dst;
396 struct dst_entry *from = dst->from;
397 struct inet6_dev *idev;
398
399 dst_destroy_metrics_generic(dst);
400 free_percpu(rt->rt6i_pcpu);
401 rt6_uncached_list_del(rt);
402
403 idev = rt->rt6i_idev;
404 if (idev) {
405 rt->rt6i_idev = NULL;
406 in6_dev_put(idev);
407 }
408
409 dst->from = NULL;
410 dst_release(from);
411 }
412
413 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
414 int how)
415 {
416 struct rt6_info *rt = (struct rt6_info *)dst;
417 struct inet6_dev *idev = rt->rt6i_idev;
418 struct net_device *loopback_dev =
419 dev_net(dev)->loopback_dev;
420
421 if (dev != loopback_dev) {
422 if (idev && idev->dev == dev) {
423 struct inet6_dev *loopback_idev =
424 in6_dev_get(loopback_dev);
425 if (loopback_idev) {
426 rt->rt6i_idev = loopback_idev;
427 in6_dev_put(idev);
428 }
429 }
430 }
431 }
432
433 static bool __rt6_check_expired(const struct rt6_info *rt)
434 {
435 if (rt->rt6i_flags & RTF_EXPIRES)
436 return time_after(jiffies, rt->dst.expires);
437 else
438 return false;
439 }
440
441 static bool rt6_check_expired(const struct rt6_info *rt)
442 {
443 if (rt->rt6i_flags & RTF_EXPIRES) {
444 if (time_after(jiffies, rt->dst.expires))
445 return true;
446 } else if (rt->dst.from) {
447 return rt6_check_expired((struct rt6_info *) rt->dst.from);
448 }
449 return false;
450 }
451
452 /* Multipath route selection:
453 * Hash based function using packet header and flowlabel.
454 * Adapted from fib_info_hashfn()
455 */
456 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
457 const struct flowi6 *fl6)
458 {
459 return get_hash_from_flowi6(fl6) % candidate_count;
460 }
461
462 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
463 struct flowi6 *fl6, int oif,
464 int strict)
465 {
466 struct rt6_info *sibling, *next_sibling;
467 int route_choosen;
468
469 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
470 /* Don't change the route, if route_choosen == 0
471 * (siblings does not include ourself)
472 */
473 if (route_choosen)
474 list_for_each_entry_safe(sibling, next_sibling,
475 &match->rt6i_siblings, rt6i_siblings) {
476 route_choosen--;
477 if (route_choosen == 0) {
478 if (rt6_score_route(sibling, oif, strict) < 0)
479 break;
480 match = sibling;
481 break;
482 }
483 }
484 return match;
485 }
486
487 /*
488 * Route lookup. Any table->tb6_lock is implied.
489 */
490
491 static inline struct rt6_info *rt6_device_match(struct net *net,
492 struct rt6_info *rt,
493 const struct in6_addr *saddr,
494 int oif,
495 int flags)
496 {
497 struct rt6_info *local = NULL;
498 struct rt6_info *sprt;
499
500 if (!oif && ipv6_addr_any(saddr))
501 goto out;
502
503 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
504 struct net_device *dev = sprt->dst.dev;
505
506 if (oif) {
507 if (dev->ifindex == oif)
508 return sprt;
509 if (dev->flags & IFF_LOOPBACK) {
510 if (!sprt->rt6i_idev ||
511 sprt->rt6i_idev->dev->ifindex != oif) {
512 if (flags & RT6_LOOKUP_F_IFACE)
513 continue;
514 if (local &&
515 local->rt6i_idev->dev->ifindex == oif)
516 continue;
517 }
518 local = sprt;
519 }
520 } else {
521 if (ipv6_chk_addr(net, saddr, dev,
522 flags & RT6_LOOKUP_F_IFACE))
523 return sprt;
524 }
525 }
526
527 if (oif) {
528 if (local)
529 return local;
530
531 if (flags & RT6_LOOKUP_F_IFACE)
532 return net->ipv6.ip6_null_entry;
533 }
534 out:
535 return rt;
536 }
537
538 #ifdef CONFIG_IPV6_ROUTER_PREF
539 struct __rt6_probe_work {
540 struct work_struct work;
541 struct in6_addr target;
542 struct net_device *dev;
543 };
544
545 static void rt6_probe_deferred(struct work_struct *w)
546 {
547 struct in6_addr mcaddr;
548 struct __rt6_probe_work *work =
549 container_of(w, struct __rt6_probe_work, work);
550
551 addrconf_addr_solict_mult(&work->target, &mcaddr);
552 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
553 dev_put(work->dev);
554 kfree(work);
555 }
556
557 static void rt6_probe(struct rt6_info *rt)
558 {
559 struct __rt6_probe_work *work;
560 struct neighbour *neigh;
561 /*
562 * Okay, this does not seem to be appropriate
563 * for now, however, we need to check if it
564 * is really so; aka Router Reachability Probing.
565 *
566 * Router Reachability Probe MUST be rate-limited
567 * to no more than one per minute.
568 */
569 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
570 return;
571 rcu_read_lock_bh();
572 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
573 if (neigh) {
574 if (neigh->nud_state & NUD_VALID)
575 goto out;
576
577 work = NULL;
578 write_lock(&neigh->lock);
579 if (!(neigh->nud_state & NUD_VALID) &&
580 time_after(jiffies,
581 neigh->updated +
582 rt->rt6i_idev->cnf.rtr_probe_interval)) {
583 work = kmalloc(sizeof(*work), GFP_ATOMIC);
584 if (work)
585 __neigh_set_probe_once(neigh);
586 }
587 write_unlock(&neigh->lock);
588 } else {
589 work = kmalloc(sizeof(*work), GFP_ATOMIC);
590 }
591
592 if (work) {
593 INIT_WORK(&work->work, rt6_probe_deferred);
594 work->target = rt->rt6i_gateway;
595 dev_hold(rt->dst.dev);
596 work->dev = rt->dst.dev;
597 schedule_work(&work->work);
598 }
599
600 out:
601 rcu_read_unlock_bh();
602 }
603 #else
604 static inline void rt6_probe(struct rt6_info *rt)
605 {
606 }
607 #endif
608
609 /*
610 * Default Router Selection (RFC 2461 6.3.6)
611 */
612 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
613 {
614 struct net_device *dev = rt->dst.dev;
615 if (!oif || dev->ifindex == oif)
616 return 2;
617 if ((dev->flags & IFF_LOOPBACK) &&
618 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
619 return 1;
620 return 0;
621 }
622
623 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
624 {
625 struct neighbour *neigh;
626 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
627
628 if (rt->rt6i_flags & RTF_NONEXTHOP ||
629 !(rt->rt6i_flags & RTF_GATEWAY))
630 return RT6_NUD_SUCCEED;
631
632 rcu_read_lock_bh();
633 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
634 if (neigh) {
635 read_lock(&neigh->lock);
636 if (neigh->nud_state & NUD_VALID)
637 ret = RT6_NUD_SUCCEED;
638 #ifdef CONFIG_IPV6_ROUTER_PREF
639 else if (!(neigh->nud_state & NUD_FAILED))
640 ret = RT6_NUD_SUCCEED;
641 else
642 ret = RT6_NUD_FAIL_PROBE;
643 #endif
644 read_unlock(&neigh->lock);
645 } else {
646 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
647 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
648 }
649 rcu_read_unlock_bh();
650
651 return ret;
652 }
653
654 static int rt6_score_route(struct rt6_info *rt, int oif,
655 int strict)
656 {
657 int m;
658
659 m = rt6_check_dev(rt, oif);
660 if (!m && (strict & RT6_LOOKUP_F_IFACE))
661 return RT6_NUD_FAIL_HARD;
662 #ifdef CONFIG_IPV6_ROUTER_PREF
663 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
664 #endif
665 if (strict & RT6_LOOKUP_F_REACHABLE) {
666 int n = rt6_check_neigh(rt);
667 if (n < 0)
668 return n;
669 }
670 return m;
671 }
672
673 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
674 int *mpri, struct rt6_info *match,
675 bool *do_rr)
676 {
677 int m;
678 bool match_do_rr = false;
679 struct inet6_dev *idev = rt->rt6i_idev;
680 struct net_device *dev = rt->dst.dev;
681
682 if (dev && !netif_carrier_ok(dev) &&
683 idev->cnf.ignore_routes_with_linkdown &&
684 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
685 goto out;
686
687 if (rt6_check_expired(rt))
688 goto out;
689
690 m = rt6_score_route(rt, oif, strict);
691 if (m == RT6_NUD_FAIL_DO_RR) {
692 match_do_rr = true;
693 m = 0; /* lowest valid score */
694 } else if (m == RT6_NUD_FAIL_HARD) {
695 goto out;
696 }
697
698 if (strict & RT6_LOOKUP_F_REACHABLE)
699 rt6_probe(rt);
700
701 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
702 if (m > *mpri) {
703 *do_rr = match_do_rr;
704 *mpri = m;
705 match = rt;
706 }
707 out:
708 return match;
709 }
710
711 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
712 struct rt6_info *rr_head,
713 u32 metric, int oif, int strict,
714 bool *do_rr)
715 {
716 struct rt6_info *rt, *match, *cont;
717 int mpri = -1;
718
719 match = NULL;
720 cont = NULL;
721 for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
722 if (rt->rt6i_metric != metric) {
723 cont = rt;
724 break;
725 }
726
727 match = find_match(rt, oif, strict, &mpri, match, do_rr);
728 }
729
730 for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
731 if (rt->rt6i_metric != metric) {
732 cont = rt;
733 break;
734 }
735
736 match = find_match(rt, oif, strict, &mpri, match, do_rr);
737 }
738
739 if (match || !cont)
740 return match;
741
742 for (rt = cont; rt; rt = rt->dst.rt6_next)
743 match = find_match(rt, oif, strict, &mpri, match, do_rr);
744
745 return match;
746 }
747
748 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
749 {
750 struct rt6_info *match, *rt0;
751 struct net *net;
752 bool do_rr = false;
753
754 rt0 = fn->rr_ptr;
755 if (!rt0)
756 fn->rr_ptr = rt0 = fn->leaf;
757
758 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
759 &do_rr);
760
761 if (do_rr) {
762 struct rt6_info *next = rt0->dst.rt6_next;
763
764 /* no entries matched; do round-robin */
765 if (!next || next->rt6i_metric != rt0->rt6i_metric)
766 next = fn->leaf;
767
768 if (next != rt0)
769 fn->rr_ptr = next;
770 }
771
772 net = dev_net(rt0->dst.dev);
773 return match ? match : net->ipv6.ip6_null_entry;
774 }
775
776 static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
777 {
778 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
779 }
780
781 #ifdef CONFIG_IPV6_ROUTE_INFO
782 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
783 const struct in6_addr *gwaddr)
784 {
785 struct net *net = dev_net(dev);
786 struct route_info *rinfo = (struct route_info *) opt;
787 struct in6_addr prefix_buf, *prefix;
788 unsigned int pref;
789 unsigned long lifetime;
790 struct rt6_info *rt;
791
792 if (len < sizeof(struct route_info)) {
793 return -EINVAL;
794 }
795
796 /* Sanity check for prefix_len and length */
797 if (rinfo->length > 3) {
798 return -EINVAL;
799 } else if (rinfo->prefix_len > 128) {
800 return -EINVAL;
801 } else if (rinfo->prefix_len > 64) {
802 if (rinfo->length < 2) {
803 return -EINVAL;
804 }
805 } else if (rinfo->prefix_len > 0) {
806 if (rinfo->length < 1) {
807 return -EINVAL;
808 }
809 }
810
811 pref = rinfo->route_pref;
812 if (pref == ICMPV6_ROUTER_PREF_INVALID)
813 return -EINVAL;
814
815 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
816
817 if (rinfo->length == 3)
818 prefix = (struct in6_addr *)rinfo->prefix;
819 else {
820 /* this function is safe */
821 ipv6_addr_prefix(&prefix_buf,
822 (struct in6_addr *)rinfo->prefix,
823 rinfo->prefix_len);
824 prefix = &prefix_buf;
825 }
826
827 if (rinfo->prefix_len == 0)
828 rt = rt6_get_dflt_router(gwaddr, dev);
829 else
830 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
831 gwaddr, dev);
832
833 if (rt && !lifetime) {
834 ip6_del_rt(rt);
835 rt = NULL;
836 }
837
838 if (!rt && lifetime)
839 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
840 dev, pref);
841 else if (rt)
842 rt->rt6i_flags = RTF_ROUTEINFO |
843 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
844
845 if (rt) {
846 if (!addrconf_finite_timeout(lifetime))
847 rt6_clean_expires(rt);
848 else
849 rt6_set_expires(rt, jiffies + HZ * lifetime);
850
851 ip6_rt_put(rt);
852 }
853 return 0;
854 }
855 #endif
856
857 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
858 struct in6_addr *saddr)
859 {
860 struct fib6_node *pn;
861 while (1) {
862 if (fn->fn_flags & RTN_TL_ROOT)
863 return NULL;
864 pn = fn->parent;
865 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
866 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
867 else
868 fn = pn;
869 if (fn->fn_flags & RTN_RTINFO)
870 return fn;
871 }
872 }
873
874 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
875 struct fib6_table *table,
876 struct flowi6 *fl6, int flags)
877 {
878 struct fib6_node *fn;
879 struct rt6_info *rt;
880
881 read_lock_bh(&table->tb6_lock);
882 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
883 restart:
884 rt = fn->leaf;
885 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
886 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
887 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
888 if (rt == net->ipv6.ip6_null_entry) {
889 fn = fib6_backtrack(fn, &fl6->saddr);
890 if (fn)
891 goto restart;
892 }
893 dst_use(&rt->dst, jiffies);
894 read_unlock_bh(&table->tb6_lock);
895
896 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
897
898 return rt;
899
900 }
901
902 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
903 int flags)
904 {
905 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
906 }
907 EXPORT_SYMBOL_GPL(ip6_route_lookup);
908
909 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
910 const struct in6_addr *saddr, int oif, int strict)
911 {
912 struct flowi6 fl6 = {
913 .flowi6_oif = oif,
914 .daddr = *daddr,
915 };
916 struct dst_entry *dst;
917 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
918
919 if (saddr) {
920 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
921 flags |= RT6_LOOKUP_F_HAS_SADDR;
922 }
923
924 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
925 if (dst->error == 0)
926 return (struct rt6_info *) dst;
927
928 dst_release(dst);
929
930 return NULL;
931 }
932 EXPORT_SYMBOL(rt6_lookup);
933
934 /* ip6_ins_rt is called with FREE table->tb6_lock.
935 It takes new route entry, the addition fails by any reason the
936 route is freed. In any case, if caller does not hold it, it may
937 be destroyed.
938 */
939
940 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
941 struct mx6_config *mxc)
942 {
943 int err;
944 struct fib6_table *table;
945
946 table = rt->rt6i_table;
947 write_lock_bh(&table->tb6_lock);
948 err = fib6_add(&table->tb6_root, rt, info, mxc);
949 write_unlock_bh(&table->tb6_lock);
950
951 return err;
952 }
953
954 int ip6_ins_rt(struct rt6_info *rt)
955 {
956 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
957 struct mx6_config mxc = { .mx = NULL, };
958
959 return __ip6_ins_rt(rt, &info, &mxc);
960 }
961
962 static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
963 const struct in6_addr *daddr,
964 const struct in6_addr *saddr)
965 {
966 struct rt6_info *rt;
967
968 /*
969 * Clone the route.
970 */
971
972 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
973 ort = (struct rt6_info *)ort->dst.from;
974
975 rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
976
977 if (!rt)
978 return NULL;
979
980 ip6_rt_copy_init(rt, ort);
981 rt->rt6i_flags |= RTF_CACHE;
982 rt->rt6i_metric = 0;
983 rt->dst.flags |= DST_HOST;
984 rt->rt6i_dst.addr = *daddr;
985 rt->rt6i_dst.plen = 128;
986
987 if (!rt6_is_gw_or_nonexthop(ort)) {
988 if (ort->rt6i_dst.plen != 128 &&
989 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
990 rt->rt6i_flags |= RTF_ANYCAST;
991 #ifdef CONFIG_IPV6_SUBTREES
992 if (rt->rt6i_src.plen && saddr) {
993 rt->rt6i_src.addr = *saddr;
994 rt->rt6i_src.plen = 128;
995 }
996 #endif
997 }
998
999 return rt;
1000 }
1001
1002 static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
1003 {
1004 struct rt6_info *pcpu_rt;
1005
1006 pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
1007 rt->dst.dev, rt->dst.flags);
1008
1009 if (!pcpu_rt)
1010 return NULL;
1011 ip6_rt_copy_init(pcpu_rt, rt);
1012 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
1013 pcpu_rt->rt6i_flags |= RTF_PCPU;
1014 return pcpu_rt;
1015 }
1016
1017 /* It should be called with read_lock_bh(&tb6_lock) acquired */
1018 static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
1019 {
1020 struct rt6_info *pcpu_rt, **p;
1021
1022 p = this_cpu_ptr(rt->rt6i_pcpu);
1023 pcpu_rt = *p;
1024
1025 if (pcpu_rt) {
1026 dst_hold(&pcpu_rt->dst);
1027 rt6_dst_from_metrics_check(pcpu_rt);
1028 }
1029 return pcpu_rt;
1030 }
1031
1032 static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1033 {
1034 struct fib6_table *table = rt->rt6i_table;
1035 struct rt6_info *pcpu_rt, *prev, **p;
1036
1037 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1038 if (!pcpu_rt) {
1039 struct net *net = dev_net(rt->dst.dev);
1040
1041 dst_hold(&net->ipv6.ip6_null_entry->dst);
1042 return net->ipv6.ip6_null_entry;
1043 }
1044
1045 read_lock_bh(&table->tb6_lock);
1046 if (rt->rt6i_pcpu) {
1047 p = this_cpu_ptr(rt->rt6i_pcpu);
1048 prev = cmpxchg(p, NULL, pcpu_rt);
1049 if (prev) {
1050 /* If someone did it before us, return prev instead */
1051 dst_destroy(&pcpu_rt->dst);
1052 pcpu_rt = prev;
1053 }
1054 } else {
1055 /* rt has been removed from the fib6 tree
1056 * before we have a chance to acquire the read_lock.
1057 * In this case, don't brother to create a pcpu rt
1058 * since rt is going away anyway. The next
1059 * dst_check() will trigger a re-lookup.
1060 */
1061 dst_destroy(&pcpu_rt->dst);
1062 pcpu_rt = rt;
1063 }
1064 dst_hold(&pcpu_rt->dst);
1065 rt6_dst_from_metrics_check(pcpu_rt);
1066 read_unlock_bh(&table->tb6_lock);
1067 return pcpu_rt;
1068 }
1069
1070 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1071 int oif, struct flowi6 *fl6, int flags)
1072 {
1073 struct fib6_node *fn, *saved_fn;
1074 struct rt6_info *rt;
1075 int strict = 0;
1076
1077 strict |= flags & RT6_LOOKUP_F_IFACE;
1078 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
1079 if (net->ipv6.devconf_all->forwarding == 0)
1080 strict |= RT6_LOOKUP_F_REACHABLE;
1081
1082 read_lock_bh(&table->tb6_lock);
1083
1084 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1085 saved_fn = fn;
1086
1087 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1088 oif = 0;
1089
1090 redo_rt6_select:
1091 rt = rt6_select(fn, oif, strict);
1092 if (rt->rt6i_nsiblings)
1093 rt = rt6_multipath_select(rt, fl6, oif, strict);
1094 if (rt == net->ipv6.ip6_null_entry) {
1095 fn = fib6_backtrack(fn, &fl6->saddr);
1096 if (fn)
1097 goto redo_rt6_select;
1098 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1099 /* also consider unreachable route */
1100 strict &= ~RT6_LOOKUP_F_REACHABLE;
1101 fn = saved_fn;
1102 goto redo_rt6_select;
1103 }
1104 }
1105
1106
1107 if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
1108 dst_use(&rt->dst, jiffies);
1109 read_unlock_bh(&table->tb6_lock);
1110
1111 rt6_dst_from_metrics_check(rt);
1112
1113 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1114 return rt;
1115 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1116 !(rt->rt6i_flags & RTF_GATEWAY))) {
1117 /* Create a RTF_CACHE clone which will not be
1118 * owned by the fib6 tree. It is for the special case where
1119 * the daddr in the skb during the neighbor look-up is different
1120 * from the fl6->daddr used to look-up route here.
1121 */
1122
1123 struct rt6_info *uncached_rt;
1124
1125 dst_use(&rt->dst, jiffies);
1126 read_unlock_bh(&table->tb6_lock);
1127
1128 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1129 dst_release(&rt->dst);
1130
1131 if (uncached_rt)
1132 rt6_uncached_list_add(uncached_rt);
1133 else
1134 uncached_rt = net->ipv6.ip6_null_entry;
1135
1136 dst_hold(&uncached_rt->dst);
1137
1138 trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
1139 return uncached_rt;
1140
1141 } else {
1142 /* Get a percpu copy */
1143
1144 struct rt6_info *pcpu_rt;
1145
1146 rt->dst.lastuse = jiffies;
1147 rt->dst.__use++;
1148 pcpu_rt = rt6_get_pcpu_route(rt);
1149
1150 if (pcpu_rt) {
1151 read_unlock_bh(&table->tb6_lock);
1152 } else {
1153 /* We have to do the read_unlock first
1154 * because rt6_make_pcpu_route() may trigger
1155 * ip6_dst_gc() which will take the write_lock.
1156 */
1157 dst_hold(&rt->dst);
1158 read_unlock_bh(&table->tb6_lock);
1159 pcpu_rt = rt6_make_pcpu_route(rt);
1160 dst_release(&rt->dst);
1161 }
1162
1163 trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
1164 return pcpu_rt;
1165
1166 }
1167 }
1168 EXPORT_SYMBOL_GPL(ip6_pol_route);
1169
1170 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
1171 struct flowi6 *fl6, int flags)
1172 {
1173 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1174 }
1175
1176 struct dst_entry *ip6_route_input_lookup(struct net *net,
1177 struct net_device *dev,
1178 struct flowi6 *fl6, int flags)
1179 {
1180 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1181 flags |= RT6_LOOKUP_F_IFACE;
1182
1183 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1184 }
1185 EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
1186
1187 void ip6_route_input(struct sk_buff *skb)
1188 {
1189 const struct ipv6hdr *iph = ipv6_hdr(skb);
1190 struct net *net = dev_net(skb->dev);
1191 int flags = RT6_LOOKUP_F_HAS_SADDR;
1192 struct ip_tunnel_info *tun_info;
1193 struct flowi6 fl6 = {
1194 .flowi6_iif = skb->dev->ifindex,
1195 .daddr = iph->daddr,
1196 .saddr = iph->saddr,
1197 .flowlabel = ip6_flowinfo(iph),
1198 .flowi6_mark = skb->mark,
1199 .flowi6_proto = iph->nexthdr,
1200 };
1201
1202 tun_info = skb_tunnel_info(skb);
1203 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1204 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1205 skb_dst_drop(skb);
1206 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1207 }
1208
1209 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1210 struct flowi6 *fl6, int flags)
1211 {
1212 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1213 }
1214
1215 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1216 struct flowi6 *fl6, int flags)
1217 {
1218 bool any_src;
1219
1220 if (rt6_need_strict(&fl6->daddr)) {
1221 struct dst_entry *dst;
1222
1223 dst = l3mdev_link_scope_lookup(net, fl6);
1224 if (dst)
1225 return dst;
1226 }
1227
1228 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1229
1230 any_src = ipv6_addr_any(&fl6->saddr);
1231 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1232 (fl6->flowi6_oif && any_src))
1233 flags |= RT6_LOOKUP_F_IFACE;
1234
1235 if (!any_src)
1236 flags |= RT6_LOOKUP_F_HAS_SADDR;
1237 else if (sk)
1238 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1239
1240 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1241 }
1242 EXPORT_SYMBOL_GPL(ip6_route_output_flags);
1243
1244 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1245 {
1246 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1247 struct dst_entry *new = NULL;
1248
1249 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1250 if (rt) {
1251 rt6_info_init(rt);
1252
1253 new = &rt->dst;
1254 new->__use = 1;
1255 new->input = dst_discard;
1256 new->output = dst_discard_out;
1257
1258 dst_copy_metrics(new, &ort->dst);
1259 rt->rt6i_idev = ort->rt6i_idev;
1260 if (rt->rt6i_idev)
1261 in6_dev_hold(rt->rt6i_idev);
1262
1263 rt->rt6i_gateway = ort->rt6i_gateway;
1264 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
1265 rt->rt6i_metric = 0;
1266
1267 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1268 #ifdef CONFIG_IPV6_SUBTREES
1269 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1270 #endif
1271
1272 dst_free(new);
1273 }
1274
1275 dst_release(dst_orig);
1276 return new ? new : ERR_PTR(-ENOMEM);
1277 }
1278
1279 /*
1280 * Destination cache support functions
1281 */
1282
1283 static void rt6_dst_from_metrics_check(struct rt6_info *rt)
1284 {
1285 if (rt->dst.from &&
1286 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
1287 dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
1288 }
1289
1290 static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
1291 {
1292 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1293 return NULL;
1294
1295 if (rt6_check_expired(rt))
1296 return NULL;
1297
1298 return &rt->dst;
1299 }
1300
1301 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
1302 {
1303 if (!__rt6_check_expired(rt) &&
1304 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
1305 rt6_check((struct rt6_info *)(rt->dst.from), cookie))
1306 return &rt->dst;
1307 else
1308 return NULL;
1309 }
1310
1311 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1312 {
1313 struct rt6_info *rt;
1314
1315 rt = (struct rt6_info *) dst;
1316
1317 /* All IPV6 dsts are created with ->obsolete set to the value
1318 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1319 * into this function always.
1320 */
1321
1322 rt6_dst_from_metrics_check(rt);
1323
1324 if (rt->rt6i_flags & RTF_PCPU ||
1325 (unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
1326 return rt6_dst_from_check(rt, cookie);
1327 else
1328 return rt6_check(rt, cookie);
1329 }
1330
1331 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1332 {
1333 struct rt6_info *rt = (struct rt6_info *) dst;
1334
1335 if (rt) {
1336 if (rt->rt6i_flags & RTF_CACHE) {
1337 if (rt6_check_expired(rt)) {
1338 ip6_del_rt(rt);
1339 dst = NULL;
1340 }
1341 } else {
1342 dst_release(dst);
1343 dst = NULL;
1344 }
1345 }
1346 return dst;
1347 }
1348
1349 static void ip6_link_failure(struct sk_buff *skb)
1350 {
1351 struct rt6_info *rt;
1352
1353 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1354
1355 rt = (struct rt6_info *) skb_dst(skb);
1356 if (rt) {
1357 if (rt->rt6i_flags & RTF_CACHE) {
1358 dst_hold(&rt->dst);
1359 ip6_del_rt(rt);
1360 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1361 rt->rt6i_node->fn_sernum = -1;
1362 }
1363 }
1364 }
1365
1366 static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
1367 {
1368 struct net *net = dev_net(rt->dst.dev);
1369
1370 rt->rt6i_flags |= RTF_MODIFIED;
1371 rt->rt6i_pmtu = mtu;
1372 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1373 }
1374
1375 static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
1376 {
1377 return !(rt->rt6i_flags & RTF_CACHE) &&
1378 (rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
1379 }
1380
1381 static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
1382 const struct ipv6hdr *iph, u32 mtu)
1383 {
1384 const struct in6_addr *daddr, *saddr;
1385 struct rt6_info *rt6 = (struct rt6_info *)dst;
1386
1387 if (rt6->rt6i_flags & RTF_LOCAL)
1388 return;
1389
1390 if (dst_metric_locked(dst, RTAX_MTU))
1391 return;
1392
1393 if (iph) {
1394 daddr = &iph->daddr;
1395 saddr = &iph->saddr;
1396 } else if (sk) {
1397 daddr = &sk->sk_v6_daddr;
1398 saddr = &inet6_sk(sk)->saddr;
1399 } else {
1400 daddr = NULL;
1401 saddr = NULL;
1402 }
1403 dst_confirm_neigh(dst, daddr);
1404 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
1405 if (mtu >= dst_mtu(dst))
1406 return;
1407
1408 if (!rt6_cache_allowed_for_pmtu(rt6)) {
1409 rt6_do_update_pmtu(rt6, mtu);
1410 } else if (daddr) {
1411 struct rt6_info *nrt6;
1412
1413 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
1414 if (nrt6) {
1415 rt6_do_update_pmtu(nrt6, mtu);
1416
1417 /* ip6_ins_rt(nrt6) will bump the
1418 * rt6->rt6i_node->fn_sernum
1419 * which will fail the next rt6_check() and
1420 * invalidate the sk->sk_dst_cache.
1421 */
1422 ip6_ins_rt(nrt6);
1423 }
1424 }
1425 }
1426
1427 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1428 struct sk_buff *skb, u32 mtu)
1429 {
1430 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
1431 }
1432
1433 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1434 int oif, u32 mark, kuid_t uid)
1435 {
1436 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1437 struct dst_entry *dst;
1438 struct flowi6 fl6;
1439
1440 memset(&fl6, 0, sizeof(fl6));
1441 fl6.flowi6_oif = oif;
1442 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1443 fl6.daddr = iph->daddr;
1444 fl6.saddr = iph->saddr;
1445 fl6.flowlabel = ip6_flowinfo(iph);
1446 fl6.flowi6_uid = uid;
1447
1448 dst = ip6_route_output(net, NULL, &fl6);
1449 if (!dst->error)
1450 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
1451 dst_release(dst);
1452 }
1453 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1454
1455 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1456 {
1457 struct dst_entry *dst;
1458
1459 ip6_update_pmtu(skb, sock_net(sk), mtu,
1460 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
1461
1462 dst = __sk_dst_get(sk);
1463 if (!dst || !dst->obsolete ||
1464 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
1465 return;
1466
1467 bh_lock_sock(sk);
1468 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
1469 ip6_datagram_dst_update(sk, false);
1470 bh_unlock_sock(sk);
1471 }
1472 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1473
1474 /* Handle redirects */
1475 struct ip6rd_flowi {
1476 struct flowi6 fl6;
1477 struct in6_addr gateway;
1478 };
1479
1480 static struct rt6_info *__ip6_route_redirect(struct net *net,
1481 struct fib6_table *table,
1482 struct flowi6 *fl6,
1483 int flags)
1484 {
1485 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1486 struct rt6_info *rt;
1487 struct fib6_node *fn;
1488
1489 /* Get the "current" route for this destination and
1490 * check if the redirect has come from appropriate router.
1491 *
1492 * RFC 4861 specifies that redirects should only be
1493 * accepted if they come from the nexthop to the target.
1494 * Due to the way the routes are chosen, this notion
1495 * is a bit fuzzy and one might need to check all possible
1496 * routes.
1497 */
1498
1499 read_lock_bh(&table->tb6_lock);
1500 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1501 restart:
1502 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1503 if (rt6_check_expired(rt))
1504 continue;
1505 if (rt->dst.error)
1506 break;
1507 if (!(rt->rt6i_flags & RTF_GATEWAY))
1508 continue;
1509 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1510 continue;
1511 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1512 continue;
1513 break;
1514 }
1515
1516 if (!rt)
1517 rt = net->ipv6.ip6_null_entry;
1518 else if (rt->dst.error) {
1519 rt = net->ipv6.ip6_null_entry;
1520 goto out;
1521 }
1522
1523 if (rt == net->ipv6.ip6_null_entry) {
1524 fn = fib6_backtrack(fn, &fl6->saddr);
1525 if (fn)
1526 goto restart;
1527 }
1528
1529 out:
1530 dst_hold(&rt->dst);
1531
1532 read_unlock_bh(&table->tb6_lock);
1533
1534 trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
1535 return rt;
1536 };
1537
1538 static struct dst_entry *ip6_route_redirect(struct net *net,
1539 const struct flowi6 *fl6,
1540 const struct in6_addr *gateway)
1541 {
1542 int flags = RT6_LOOKUP_F_HAS_SADDR;
1543 struct ip6rd_flowi rdfl;
1544
1545 rdfl.fl6 = *fl6;
1546 rdfl.gateway = *gateway;
1547
1548 return fib6_rule_lookup(net, &rdfl.fl6,
1549 flags, __ip6_route_redirect);
1550 }
1551
1552 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
1553 kuid_t uid)
1554 {
1555 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1556 struct dst_entry *dst;
1557 struct flowi6 fl6;
1558
1559 memset(&fl6, 0, sizeof(fl6));
1560 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1561 fl6.flowi6_oif = oif;
1562 fl6.flowi6_mark = mark;
1563 fl6.daddr = iph->daddr;
1564 fl6.saddr = iph->saddr;
1565 fl6.flowlabel = ip6_flowinfo(iph);
1566 fl6.flowi6_uid = uid;
1567
1568 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1569 rt6_do_redirect(dst, NULL, skb);
1570 dst_release(dst);
1571 }
1572 EXPORT_SYMBOL_GPL(ip6_redirect);
1573
1574 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1575 u32 mark)
1576 {
1577 const struct ipv6hdr *iph = ipv6_hdr(skb);
1578 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1579 struct dst_entry *dst;
1580 struct flowi6 fl6;
1581
1582 memset(&fl6, 0, sizeof(fl6));
1583 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1584 fl6.flowi6_oif = oif;
1585 fl6.flowi6_mark = mark;
1586 fl6.daddr = msg->dest;
1587 fl6.saddr = iph->daddr;
1588 fl6.flowi6_uid = sock_net_uid(net, NULL);
1589
1590 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1591 rt6_do_redirect(dst, NULL, skb);
1592 dst_release(dst);
1593 }
1594
1595 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1596 {
1597 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
1598 sk->sk_uid);
1599 }
1600 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1601
1602 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1603 {
1604 struct net_device *dev = dst->dev;
1605 unsigned int mtu = dst_mtu(dst);
1606 struct net *net = dev_net(dev);
1607
1608 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1609
1610 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1611 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1612
1613 /*
1614 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1615 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1616 * IPV6_MAXPLEN is also valid and means: "any MSS,
1617 * rely only on pmtu discovery"
1618 */
1619 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1620 mtu = IPV6_MAXPLEN;
1621 return mtu;
1622 }
1623
1624 static unsigned int ip6_mtu(const struct dst_entry *dst)
1625 {
1626 const struct rt6_info *rt = (const struct rt6_info *)dst;
1627 unsigned int mtu = rt->rt6i_pmtu;
1628 struct inet6_dev *idev;
1629
1630 if (mtu)
1631 goto out;
1632
1633 mtu = dst_metric_raw(dst, RTAX_MTU);
1634 if (mtu)
1635 goto out;
1636
1637 mtu = IPV6_MIN_MTU;
1638
1639 rcu_read_lock();
1640 idev = __in6_dev_get(dst->dev);
1641 if (idev)
1642 mtu = idev->cnf.mtu6;
1643 rcu_read_unlock();
1644
1645 out:
1646 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1647
1648 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
1649 }
1650
1651 static struct dst_entry *icmp6_dst_gc_list;
1652 static DEFINE_SPINLOCK(icmp6_dst_lock);
1653
1654 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1655 struct flowi6 *fl6)
1656 {
1657 struct dst_entry *dst;
1658 struct rt6_info *rt;
1659 struct inet6_dev *idev = in6_dev_get(dev);
1660 struct net *net = dev_net(dev);
1661
1662 if (unlikely(!idev))
1663 return ERR_PTR(-ENODEV);
1664
1665 rt = ip6_dst_alloc(net, dev, 0);
1666 if (unlikely(!rt)) {
1667 in6_dev_put(idev);
1668 dst = ERR_PTR(-ENOMEM);
1669 goto out;
1670 }
1671
1672 rt->dst.flags |= DST_HOST;
1673 rt->dst.output = ip6_output;
1674 atomic_set(&rt->dst.__refcnt, 1);
1675 rt->rt6i_gateway = fl6->daddr;
1676 rt->rt6i_dst.addr = fl6->daddr;
1677 rt->rt6i_dst.plen = 128;
1678 rt->rt6i_idev = idev;
1679 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1680
1681 spin_lock_bh(&icmp6_dst_lock);
1682 rt->dst.next = icmp6_dst_gc_list;
1683 icmp6_dst_gc_list = &rt->dst;
1684 spin_unlock_bh(&icmp6_dst_lock);
1685
1686 fib6_force_start_gc(net);
1687
1688 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1689
1690 out:
1691 return dst;
1692 }
1693
1694 int icmp6_dst_gc(void)
1695 {
1696 struct dst_entry *dst, **pprev;
1697 int more = 0;
1698
1699 spin_lock_bh(&icmp6_dst_lock);
1700 pprev = &icmp6_dst_gc_list;
1701
1702 while ((dst = *pprev) != NULL) {
1703 if (!atomic_read(&dst->__refcnt)) {
1704 *pprev = dst->next;
1705 dst_free(dst);
1706 } else {
1707 pprev = &dst->next;
1708 ++more;
1709 }
1710 }
1711
1712 spin_unlock_bh(&icmp6_dst_lock);
1713
1714 return more;
1715 }
1716
1717 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1718 void *arg)
1719 {
1720 struct dst_entry *dst, **pprev;
1721
1722 spin_lock_bh(&icmp6_dst_lock);
1723 pprev = &icmp6_dst_gc_list;
1724 while ((dst = *pprev) != NULL) {
1725 struct rt6_info *rt = (struct rt6_info *) dst;
1726 if (func(rt, arg)) {
1727 *pprev = dst->next;
1728 dst_free(dst);
1729 } else {
1730 pprev = &dst->next;
1731 }
1732 }
1733 spin_unlock_bh(&icmp6_dst_lock);
1734 }
1735
1736 static int ip6_dst_gc(struct dst_ops *ops)
1737 {
1738 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1739 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1740 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1741 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1742 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1743 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1744 int entries;
1745
1746 entries = dst_entries_get_fast(ops);
1747 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1748 entries <= rt_max_size)
1749 goto out;
1750
1751 net->ipv6.ip6_rt_gc_expire++;
1752 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1753 entries = dst_entries_get_slow(ops);
1754 if (entries < ops->gc_thresh)
1755 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1756 out:
1757 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1758 return entries > rt_max_size;
1759 }
1760
1761 static int ip6_convert_metrics(struct mx6_config *mxc,
1762 const struct fib6_config *cfg)
1763 {
1764 bool ecn_ca = false;
1765 struct nlattr *nla;
1766 int remaining;
1767 u32 *mp;
1768
1769 if (!cfg->fc_mx)
1770 return 0;
1771
1772 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1773 if (unlikely(!mp))
1774 return -ENOMEM;
1775
1776 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1777 int type = nla_type(nla);
1778 u32 val;
1779
1780 if (!type)
1781 continue;
1782 if (unlikely(type > RTAX_MAX))
1783 goto err;
1784
1785 if (type == RTAX_CC_ALGO) {
1786 char tmp[TCP_CA_NAME_MAX];
1787
1788 nla_strlcpy(tmp, nla, sizeof(tmp));
1789 val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
1790 if (val == TCP_CA_UNSPEC)
1791 goto err;
1792 } else {
1793 val = nla_get_u32(nla);
1794 }
1795 if (type == RTAX_HOPLIMIT && val > 255)
1796 val = 255;
1797 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
1798 goto err;
1799
1800 mp[type - 1] = val;
1801 __set_bit(type - 1, mxc->mx_valid);
1802 }
1803
1804 if (ecn_ca) {
1805 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
1806 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
1807 }
1808
1809 mxc->mx = mp;
1810 return 0;
1811 err:
1812 kfree(mp);
1813 return -EINVAL;
1814 }
1815
1816 static struct rt6_info *ip6_nh_lookup_table(struct net *net,
1817 struct fib6_config *cfg,
1818 const struct in6_addr *gw_addr)
1819 {
1820 struct flowi6 fl6 = {
1821 .flowi6_oif = cfg->fc_ifindex,
1822 .daddr = *gw_addr,
1823 .saddr = cfg->fc_prefsrc,
1824 };
1825 struct fib6_table *table;
1826 struct rt6_info *rt;
1827 int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;
1828
1829 table = fib6_get_table(net, cfg->fc_table);
1830 if (!table)
1831 return NULL;
1832
1833 if (!ipv6_addr_any(&cfg->fc_prefsrc))
1834 flags |= RT6_LOOKUP_F_HAS_SADDR;
1835
1836 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
1837
1838 /* if table lookup failed, fall back to full lookup */
1839 if (rt == net->ipv6.ip6_null_entry) {
1840 ip6_rt_put(rt);
1841 rt = NULL;
1842 }
1843
1844 return rt;
1845 }
1846
1847 static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
1848 {
1849 struct net *net = cfg->fc_nlinfo.nl_net;
1850 struct rt6_info *rt = NULL;
1851 struct net_device *dev = NULL;
1852 struct inet6_dev *idev = NULL;
1853 struct fib6_table *table;
1854 int addr_type;
1855 int err = -EINVAL;
1856
1857 /* RTF_PCPU is an internal flag; can not be set by userspace */
1858 if (cfg->fc_flags & RTF_PCPU)
1859 goto out;
1860
1861 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1862 goto out;
1863 #ifndef CONFIG_IPV6_SUBTREES
1864 if (cfg->fc_src_len)
1865 goto out;
1866 #endif
1867 if (cfg->fc_ifindex) {
1868 err = -ENODEV;
1869 dev = dev_get_by_index(net, cfg->fc_ifindex);
1870 if (!dev)
1871 goto out;
1872 idev = in6_dev_get(dev);
1873 if (!idev)
1874 goto out;
1875 }
1876
1877 if (cfg->fc_metric == 0)
1878 cfg->fc_metric = IP6_RT_PRIO_USER;
1879
1880 err = -ENOBUFS;
1881 if (cfg->fc_nlinfo.nlh &&
1882 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1883 table = fib6_get_table(net, cfg->fc_table);
1884 if (!table) {
1885 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1886 table = fib6_new_table(net, cfg->fc_table);
1887 }
1888 } else {
1889 table = fib6_new_table(net, cfg->fc_table);
1890 }
1891
1892 if (!table)
1893 goto out;
1894
1895 rt = ip6_dst_alloc(net, NULL,
1896 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
1897
1898 if (!rt) {
1899 err = -ENOMEM;
1900 goto out;
1901 }
1902
1903 if (cfg->fc_flags & RTF_EXPIRES)
1904 rt6_set_expires(rt, jiffies +
1905 clock_t_to_jiffies(cfg->fc_expires));
1906 else
1907 rt6_clean_expires(rt);
1908
1909 if (cfg->fc_protocol == RTPROT_UNSPEC)
1910 cfg->fc_protocol = RTPROT_BOOT;
1911 rt->rt6i_protocol = cfg->fc_protocol;
1912
1913 addr_type = ipv6_addr_type(&cfg->fc_dst);
1914
1915 if (addr_type & IPV6_ADDR_MULTICAST)
1916 rt->dst.input = ip6_mc_input;
1917 else if (cfg->fc_flags & RTF_LOCAL)
1918 rt->dst.input = ip6_input;
1919 else
1920 rt->dst.input = ip6_forward;
1921
1922 rt->dst.output = ip6_output;
1923
1924 if (cfg->fc_encap) {
1925 struct lwtunnel_state *lwtstate;
1926
1927 err = lwtunnel_build_state(cfg->fc_encap_type,
1928 cfg->fc_encap, AF_INET6, cfg,
1929 &lwtstate);
1930 if (err)
1931 goto out;
1932 rt->dst.lwtstate = lwtstate_get(lwtstate);
1933 if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
1934 rt->dst.lwtstate->orig_output = rt->dst.output;
1935 rt->dst.output = lwtunnel_output;
1936 }
1937 if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
1938 rt->dst.lwtstate->orig_input = rt->dst.input;
1939 rt->dst.input = lwtunnel_input;
1940 }
1941 }
1942
1943 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1944 rt->rt6i_dst.plen = cfg->fc_dst_len;
1945 if (rt->rt6i_dst.plen == 128)
1946 rt->dst.flags |= DST_HOST;
1947
1948 #ifdef CONFIG_IPV6_SUBTREES
1949 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1950 rt->rt6i_src.plen = cfg->fc_src_len;
1951 #endif
1952
1953 rt->rt6i_metric = cfg->fc_metric;
1954
1955 /* We cannot add true routes via loopback here,
1956 they would result in kernel looping; promote them to reject routes
1957 */
1958 if ((cfg->fc_flags & RTF_REJECT) ||
1959 (dev && (dev->flags & IFF_LOOPBACK) &&
1960 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1961 !(cfg->fc_flags & RTF_LOCAL))) {
1962 /* hold loopback dev/idev if we haven't done so. */
1963 if (dev != net->loopback_dev) {
1964 if (dev) {
1965 dev_put(dev);
1966 in6_dev_put(idev);
1967 }
1968 dev = net->loopback_dev;
1969 dev_hold(dev);
1970 idev = in6_dev_get(dev);
1971 if (!idev) {
1972 err = -ENODEV;
1973 goto out;
1974 }
1975 }
1976 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1977 switch (cfg->fc_type) {
1978 case RTN_BLACKHOLE:
1979 rt->dst.error = -EINVAL;
1980 rt->dst.output = dst_discard_out;
1981 rt->dst.input = dst_discard;
1982 break;
1983 case RTN_PROHIBIT:
1984 rt->dst.error = -EACCES;
1985 rt->dst.output = ip6_pkt_prohibit_out;
1986 rt->dst.input = ip6_pkt_prohibit;
1987 break;
1988 case RTN_THROW:
1989 case RTN_UNREACHABLE:
1990 default:
1991 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1992 : (cfg->fc_type == RTN_UNREACHABLE)
1993 ? -EHOSTUNREACH : -ENETUNREACH;
1994 rt->dst.output = ip6_pkt_discard_out;
1995 rt->dst.input = ip6_pkt_discard;
1996 break;
1997 }
1998 goto install_route;
1999 }
2000
2001 if (cfg->fc_flags & RTF_GATEWAY) {
2002 const struct in6_addr *gw_addr;
2003 int gwa_type;
2004
2005 gw_addr = &cfg->fc_gateway;
2006 gwa_type = ipv6_addr_type(gw_addr);
2007
2008 /* if gw_addr is local we will fail to detect this in case
2009 * address is still TENTATIVE (DAD in progress). rt6_lookup()
2010 * will return already-added prefix route via interface that
2011 * prefix route was assigned to, which might be non-loopback.
2012 */
2013 err = -EINVAL;
2014 if (ipv6_chk_addr_and_flags(net, gw_addr,
2015 gwa_type & IPV6_ADDR_LINKLOCAL ?
2016 dev : NULL, 0, 0))
2017 goto out;
2018
2019 rt->rt6i_gateway = *gw_addr;
2020
2021 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
2022 struct rt6_info *grt = NULL;
2023
2024 /* IPv6 strictly inhibits using not link-local
2025 addresses as nexthop address.
2026 Otherwise, router will not able to send redirects.
2027 It is very good, but in some (rare!) circumstances
2028 (SIT, PtP, NBMA NOARP links) it is handy to allow
2029 some exceptions. --ANK
2030 We allow IPv4-mapped nexthops to support RFC4798-type
2031 addressing
2032 */
2033 if (!(gwa_type & (IPV6_ADDR_UNICAST |
2034 IPV6_ADDR_MAPPED)))
2035 goto out;
2036
2037 if (cfg->fc_table) {
2038 grt = ip6_nh_lookup_table(net, cfg, gw_addr);
2039
2040 if (grt) {
2041 if (grt->rt6i_flags & RTF_GATEWAY ||
2042 (dev && dev != grt->dst.dev)) {
2043 ip6_rt_put(grt);
2044 grt = NULL;
2045 }
2046 }
2047 }
2048
2049 if (!grt)
2050 grt = rt6_lookup(net, gw_addr, NULL,
2051 cfg->fc_ifindex, 1);
2052
2053 err = -EHOSTUNREACH;
2054 if (!grt)
2055 goto out;
2056 if (dev) {
2057 if (dev != grt->dst.dev) {
2058 ip6_rt_put(grt);
2059 goto out;
2060 }
2061 } else {
2062 dev = grt->dst.dev;
2063 idev = grt->rt6i_idev;
2064 dev_hold(dev);
2065 in6_dev_hold(grt->rt6i_idev);
2066 }
2067 if (!(grt->rt6i_flags & RTF_GATEWAY))
2068 err = 0;
2069 ip6_rt_put(grt);
2070
2071 if (err)
2072 goto out;
2073 }
2074 err = -EINVAL;
2075 if (!dev || (dev->flags & IFF_LOOPBACK))
2076 goto out;
2077 }
2078
2079 err = -ENODEV;
2080 if (!dev)
2081 goto out;
2082
2083 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2084 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2085 err = -EINVAL;
2086 goto out;
2087 }
2088 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2089 rt->rt6i_prefsrc.plen = 128;
2090 } else
2091 rt->rt6i_prefsrc.plen = 0;
2092
2093 rt->rt6i_flags = cfg->fc_flags;
2094
2095 install_route:
2096 rt->dst.dev = dev;
2097 rt->rt6i_idev = idev;
2098 rt->rt6i_table = table;
2099
2100 cfg->fc_nlinfo.nl_net = dev_net(dev);
2101
2102 return rt;
2103 out:
2104 if (dev)
2105 dev_put(dev);
2106 if (idev)
2107 in6_dev_put(idev);
2108 if (rt)
2109 dst_free(&rt->dst);
2110
2111 return ERR_PTR(err);
2112 }
2113
2114 int ip6_route_add(struct fib6_config *cfg)
2115 {
2116 struct mx6_config mxc = { .mx = NULL, };
2117 struct rt6_info *rt;
2118 int err;
2119
2120 rt = ip6_route_info_create(cfg);
2121 if (IS_ERR(rt)) {
2122 err = PTR_ERR(rt);
2123 rt = NULL;
2124 goto out;
2125 }
2126
2127 err = ip6_convert_metrics(&mxc, cfg);
2128 if (err)
2129 goto out;
2130
2131 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
2132
2133 kfree(mxc.mx);
2134
2135 return err;
2136 out:
2137 if (rt)
2138 dst_free(&rt->dst);
2139
2140 return err;
2141 }
2142
2143 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
2144 {
2145 int err;
2146 struct fib6_table *table;
2147 struct net *net = dev_net(rt->dst.dev);
2148
2149 if (rt == net->ipv6.ip6_null_entry ||
2150 rt->dst.flags & DST_NOCACHE) {
2151 err = -ENOENT;
2152 goto out;
2153 }
2154
2155 table = rt->rt6i_table;
2156 write_lock_bh(&table->tb6_lock);
2157 err = fib6_del(rt, info);
2158 write_unlock_bh(&table->tb6_lock);
2159
2160 out:
2161 ip6_rt_put(rt);
2162 return err;
2163 }
2164
2165 int ip6_del_rt(struct rt6_info *rt)
2166 {
2167 struct nl_info info = {
2168 .nl_net = dev_net(rt->dst.dev),
2169 };
2170 return __ip6_del_rt(rt, &info);
2171 }
2172
2173 static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
2174 {
2175 struct nl_info *info = &cfg->fc_nlinfo;
2176 struct net *net = info->nl_net;
2177 struct sk_buff *skb = NULL;
2178 struct fib6_table *table;
2179 int err = -ENOENT;
2180
2181 if (rt == net->ipv6.ip6_null_entry)
2182 goto out_put;
2183 table = rt->rt6i_table;
2184 write_lock_bh(&table->tb6_lock);
2185
2186 if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) {
2187 struct rt6_info *sibling, *next_sibling;
2188
2189 /* prefer to send a single notification with all hops */
2190 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
2191 if (skb) {
2192 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2193
2194 if (rt6_fill_node(net, skb, rt,
2195 NULL, NULL, 0, RTM_DELROUTE,
2196 info->portid, seq, 0) < 0) {
2197 kfree_skb(skb);
2198 skb = NULL;
2199 } else
2200 info->skip_notify = 1;
2201 }
2202
2203 list_for_each_entry_safe(sibling, next_sibling,
2204 &rt->rt6i_siblings,
2205 rt6i_siblings) {
2206 err = fib6_del(sibling, info);
2207 if (err)
2208 goto out_unlock;
2209 }
2210 }
2211
2212 err = fib6_del(rt, info);
2213 out_unlock:
2214 write_unlock_bh(&table->tb6_lock);
2215 out_put:
2216 ip6_rt_put(rt);
2217
2218 if (skb) {
2219 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2220 info->nlh, gfp_any());
2221 }
2222 return err;
2223 }
2224
2225 static int ip6_route_del(struct fib6_config *cfg)
2226 {
2227 struct fib6_table *table;
2228 struct fib6_node *fn;
2229 struct rt6_info *rt;
2230 int err = -ESRCH;
2231
2232 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
2233 if (!table)
2234 return err;
2235
2236 read_lock_bh(&table->tb6_lock);
2237
2238 fn = fib6_locate(&table->tb6_root,
2239 &cfg->fc_dst, cfg->fc_dst_len,
2240 &cfg->fc_src, cfg->fc_src_len);
2241
2242 if (fn) {
2243 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2244 if ((rt->rt6i_flags & RTF_CACHE) &&
2245 !(cfg->fc_flags & RTF_CACHE))
2246 continue;
2247 if (cfg->fc_ifindex &&
2248 (!rt->dst.dev ||
2249 rt->dst.dev->ifindex != cfg->fc_ifindex))
2250 continue;
2251 if (cfg->fc_flags & RTF_GATEWAY &&
2252 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
2253 continue;
2254 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
2255 continue;
2256 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
2257 continue;
2258 dst_hold(&rt->dst);
2259 read_unlock_bh(&table->tb6_lock);
2260
2261 /* if gateway was specified only delete the one hop */
2262 if (cfg->fc_flags & RTF_GATEWAY)
2263 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
2264
2265 return __ip6_del_rt_siblings(rt, cfg);
2266 }
2267 }
2268 read_unlock_bh(&table->tb6_lock);
2269
2270 return err;
2271 }
2272
2273 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
2274 {
2275 struct netevent_redirect netevent;
2276 struct rt6_info *rt, *nrt = NULL;
2277 struct ndisc_options ndopts;
2278 struct inet6_dev *in6_dev;
2279 struct neighbour *neigh;
2280 struct rd_msg *msg;
2281 int optlen, on_link;
2282 u8 *lladdr;
2283
2284 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
2285 optlen -= sizeof(*msg);
2286
2287 if (optlen < 0) {
2288 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
2289 return;
2290 }
2291
2292 msg = (struct rd_msg *)icmp6_hdr(skb);
2293
2294 if (ipv6_addr_is_multicast(&msg->dest)) {
2295 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
2296 return;
2297 }
2298
2299 on_link = 0;
2300 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
2301 on_link = 1;
2302 } else if (ipv6_addr_type(&msg->target) !=
2303 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
2304 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
2305 return;
2306 }
2307
2308 in6_dev = __in6_dev_get(skb->dev);
2309 if (!in6_dev)
2310 return;
2311 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
2312 return;
2313
2314 /* RFC2461 8.1:
2315 * The IP source address of the Redirect MUST be the same as the current
2316 * first-hop router for the specified ICMP Destination Address.
2317 */
2318
2319 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
2320 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
2321 return;
2322 }
2323
2324 lladdr = NULL;
2325 if (ndopts.nd_opts_tgt_lladdr) {
2326 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
2327 skb->dev);
2328 if (!lladdr) {
2329 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
2330 return;
2331 }
2332 }
2333
2334 rt = (struct rt6_info *) dst;
2335 if (rt->rt6i_flags & RTF_REJECT) {
2336 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
2337 return;
2338 }
2339
2340 /* Redirect received -> path was valid.
2341 * Look, redirects are sent only in response to data packets,
2342 * so that this nexthop apparently is reachable. --ANK
2343 */
2344 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
2345
2346 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
2347 if (!neigh)
2348 return;
2349
2350 /*
2351 * We have finally decided to accept it.
2352 */
2353
2354 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
2355 NEIGH_UPDATE_F_WEAK_OVERRIDE|
2356 NEIGH_UPDATE_F_OVERRIDE|
2357 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
2358 NEIGH_UPDATE_F_ISROUTER)),
2359 NDISC_REDIRECT, &ndopts);
2360
2361 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
2362 if (!nrt)
2363 goto out;
2364
2365 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
2366 if (on_link)
2367 nrt->rt6i_flags &= ~RTF_GATEWAY;
2368
2369 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
2370
2371 if (ip6_ins_rt(nrt))
2372 goto out;
2373
2374 netevent.old = &rt->dst;
2375 netevent.new = &nrt->dst;
2376 netevent.daddr = &msg->dest;
2377 netevent.neigh = neigh;
2378 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
2379
2380 if (rt->rt6i_flags & RTF_CACHE) {
2381 rt = (struct rt6_info *) dst_clone(&rt->dst);
2382 ip6_del_rt(rt);
2383 }
2384
2385 out:
2386 neigh_release(neigh);
2387 }
2388
2389 /*
2390 * Misc support functions
2391 */
2392
2393 static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
2394 {
2395 BUG_ON(from->dst.from);
2396
2397 rt->rt6i_flags &= ~RTF_EXPIRES;
2398 dst_hold(&from->dst);
2399 rt->dst.from = &from->dst;
2400 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
2401 }
2402
2403 static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
2404 {
2405 rt->dst.input = ort->dst.input;
2406 rt->dst.output = ort->dst.output;
2407 rt->rt6i_dst = ort->rt6i_dst;
2408 rt->dst.error = ort->dst.error;
2409 rt->rt6i_idev = ort->rt6i_idev;
2410 if (rt->rt6i_idev)
2411 in6_dev_hold(rt->rt6i_idev);
2412 rt->dst.lastuse = jiffies;
2413 rt->rt6i_gateway = ort->rt6i_gateway;
2414 rt->rt6i_flags = ort->rt6i_flags;
2415 rt6_set_from(rt, ort);
2416 rt->rt6i_metric = ort->rt6i_metric;
2417 #ifdef CONFIG_IPV6_SUBTREES
2418 rt->rt6i_src = ort->rt6i_src;
2419 #endif
2420 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
2421 rt->rt6i_table = ort->rt6i_table;
2422 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
2423 }
2424
2425 #ifdef CONFIG_IPV6_ROUTE_INFO
2426 static struct rt6_info *rt6_get_route_info(struct net *net,
2427 const struct in6_addr *prefix, int prefixlen,
2428 const struct in6_addr *gwaddr,
2429 struct net_device *dev)
2430 {
2431 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
2432 int ifindex = dev->ifindex;
2433 struct fib6_node *fn;
2434 struct rt6_info *rt = NULL;
2435 struct fib6_table *table;
2436
2437 table = fib6_get_table(net, tb_id);
2438 if (!table)
2439 return NULL;
2440
2441 read_lock_bh(&table->tb6_lock);
2442 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
2443 if (!fn)
2444 goto out;
2445
2446 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2447 if (rt->dst.dev->ifindex != ifindex)
2448 continue;
2449 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
2450 continue;
2451 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
2452 continue;
2453 dst_hold(&rt->dst);
2454 break;
2455 }
2456 out:
2457 read_unlock_bh(&table->tb6_lock);
2458 return rt;
2459 }
2460
2461 static struct rt6_info *rt6_add_route_info(struct net *net,
2462 const struct in6_addr *prefix, int prefixlen,
2463 const struct in6_addr *gwaddr,
2464 struct net_device *dev,
2465 unsigned int pref)
2466 {
2467 struct fib6_config cfg = {
2468 .fc_metric = IP6_RT_PRIO_USER,
2469 .fc_ifindex = dev->ifindex,
2470 .fc_dst_len = prefixlen,
2471 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
2472 RTF_UP | RTF_PREF(pref),
2473 .fc_nlinfo.portid = 0,
2474 .fc_nlinfo.nlh = NULL,
2475 .fc_nlinfo.nl_net = net,
2476 };
2477
2478 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
2479 cfg.fc_dst = *prefix;
2480 cfg.fc_gateway = *gwaddr;
2481
2482 /* We should treat it as a default route if prefix length is 0. */
2483 if (!prefixlen)
2484 cfg.fc_flags |= RTF_DEFAULT;
2485
2486 ip6_route_add(&cfg);
2487
2488 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
2489 }
2490 #endif
2491
2492 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
2493 {
2494 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
2495 struct rt6_info *rt;
2496 struct fib6_table *table;
2497
2498 table = fib6_get_table(dev_net(dev), tb_id);
2499 if (!table)
2500 return NULL;
2501
2502 read_lock_bh(&table->tb6_lock);
2503 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2504 if (dev == rt->dst.dev &&
2505 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2506 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2507 break;
2508 }
2509 if (rt)
2510 dst_hold(&rt->dst);
2511 read_unlock_bh(&table->tb6_lock);
2512 return rt;
2513 }
2514
2515 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2516 struct net_device *dev,
2517 unsigned int pref)
2518 {
2519 struct fib6_config cfg = {
2520 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
2521 .fc_metric = IP6_RT_PRIO_USER,
2522 .fc_ifindex = dev->ifindex,
2523 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2524 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2525 .fc_nlinfo.portid = 0,
2526 .fc_nlinfo.nlh = NULL,
2527 .fc_nlinfo.nl_net = dev_net(dev),
2528 };
2529
2530 cfg.fc_gateway = *gwaddr;
2531
2532 if (!ip6_route_add(&cfg)) {
2533 struct fib6_table *table;
2534
2535 table = fib6_get_table(dev_net(dev), cfg.fc_table);
2536 if (table)
2537 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
2538 }
2539
2540 return rt6_get_dflt_router(gwaddr, dev);
2541 }
2542
2543 static void __rt6_purge_dflt_routers(struct fib6_table *table)
2544 {
2545 struct rt6_info *rt;
2546
2547 restart:
2548 read_lock_bh(&table->tb6_lock);
2549 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2550 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2551 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2552 dst_hold(&rt->dst);
2553 read_unlock_bh(&table->tb6_lock);
2554 ip6_del_rt(rt);
2555 goto restart;
2556 }
2557 }
2558 read_unlock_bh(&table->tb6_lock);
2559
2560 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
2561 }
2562
2563 void rt6_purge_dflt_routers(struct net *net)
2564 {
2565 struct fib6_table *table;
2566 struct hlist_head *head;
2567 unsigned int h;
2568
2569 rcu_read_lock();
2570
2571 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
2572 head = &net->ipv6.fib_table_hash[h];
2573 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
2574 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
2575 __rt6_purge_dflt_routers(table);
2576 }
2577 }
2578
2579 rcu_read_unlock();
2580 }
2581
2582 static void rtmsg_to_fib6_config(struct net *net,
2583 struct in6_rtmsg *rtmsg,
2584 struct fib6_config *cfg)
2585 {
2586 memset(cfg, 0, sizeof(*cfg));
2587
2588 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
2589 : RT6_TABLE_MAIN;
2590 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2591 cfg->fc_metric = rtmsg->rtmsg_metric;
2592 cfg->fc_expires = rtmsg->rtmsg_info;
2593 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2594 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2595 cfg->fc_flags = rtmsg->rtmsg_flags;
2596
2597 cfg->fc_nlinfo.nl_net = net;
2598
2599 cfg->fc_dst = rtmsg->rtmsg_dst;
2600 cfg->fc_src = rtmsg->rtmsg_src;
2601 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2602 }
2603
2604 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2605 {
2606 struct fib6_config cfg;
2607 struct in6_rtmsg rtmsg;
2608 int err;
2609
2610 switch (cmd) {
2611 case SIOCADDRT: /* Add a route */
2612 case SIOCDELRT: /* Delete a route */
2613 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2614 return -EPERM;
2615 err = copy_from_user(&rtmsg, arg,
2616 sizeof(struct in6_rtmsg));
2617 if (err)
2618 return -EFAULT;
2619
2620 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2621
2622 rtnl_lock();
2623 switch (cmd) {
2624 case SIOCADDRT:
2625 err = ip6_route_add(&cfg);
2626 break;
2627 case SIOCDELRT:
2628 err = ip6_route_del(&cfg);
2629 break;
2630 default:
2631 err = -EINVAL;
2632 }
2633 rtnl_unlock();
2634
2635 return err;
2636 }
2637
2638 return -EINVAL;
2639 }
2640
2641 /*
2642 * Drop the packet on the floor
2643 */
2644
2645 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2646 {
2647 int type;
2648 struct dst_entry *dst = skb_dst(skb);
2649 switch (ipstats_mib_noroutes) {
2650 case IPSTATS_MIB_INNOROUTES:
2651 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2652 if (type == IPV6_ADDR_ANY) {
2653 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2654 IPSTATS_MIB_INADDRERRORS);
2655 break;
2656 }
2657 /* FALLTHROUGH */
2658 case IPSTATS_MIB_OUTNOROUTES:
2659 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2660 ipstats_mib_noroutes);
2661 break;
2662 }
2663 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2664 kfree_skb(skb);
2665 return 0;
2666 }
2667
2668 static int ip6_pkt_discard(struct sk_buff *skb)
2669 {
2670 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2671 }
2672
2673 static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2674 {
2675 skb->dev = skb_dst(skb)->dev;
2676 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2677 }
2678
2679 static int ip6_pkt_prohibit(struct sk_buff *skb)
2680 {
2681 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2682 }
2683
2684 static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
2685 {
2686 skb->dev = skb_dst(skb)->dev;
2687 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2688 }
2689
2690 /*
2691 * Allocate a dst for local (unicast / anycast) address.
2692 */
2693
2694 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2695 const struct in6_addr *addr,
2696 bool anycast)
2697 {
2698 u32 tb_id;
2699 struct net *net = dev_net(idev->dev);
2700 struct net_device *dev = net->loopback_dev;
2701 struct rt6_info *rt;
2702
2703 /* use L3 Master device as loopback for host routes if device
2704 * is enslaved and address is not link local or multicast
2705 */
2706 if (!rt6_need_strict(addr))
2707 dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
2708
2709 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
2710 if (!rt)
2711 return ERR_PTR(-ENOMEM);
2712
2713 in6_dev_hold(idev);
2714
2715 rt->dst.flags |= DST_HOST;
2716 rt->dst.input = ip6_input;
2717 rt->dst.output = ip6_output;
2718 rt->rt6i_idev = idev;
2719
2720 rt->rt6i_protocol = RTPROT_KERNEL;
2721 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2722 if (anycast)
2723 rt->rt6i_flags |= RTF_ANYCAST;
2724 else
2725 rt->rt6i_flags |= RTF_LOCAL;
2726
2727 rt->rt6i_gateway = *addr;
2728 rt->rt6i_dst.addr = *addr;
2729 rt->rt6i_dst.plen = 128;
2730 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
2731 rt->rt6i_table = fib6_get_table(net, tb_id);
2732 rt->dst.flags |= DST_NOCACHE;
2733
2734 atomic_set(&rt->dst.__refcnt, 1);
2735
2736 return rt;
2737 }
2738
2739 /* remove deleted ip from prefsrc entries */
2740 struct arg_dev_net_ip {
2741 struct net_device *dev;
2742 struct net *net;
2743 struct in6_addr *addr;
2744 };
2745
2746 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2747 {
2748 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2749 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2750 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2751
2752 if (((void *)rt->dst.dev == dev || !dev) &&
2753 rt != net->ipv6.ip6_null_entry &&
2754 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2755 /* remove prefsrc entry */
2756 rt->rt6i_prefsrc.plen = 0;
2757 }
2758 return 0;
2759 }
2760
2761 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2762 {
2763 struct net *net = dev_net(ifp->idev->dev);
2764 struct arg_dev_net_ip adni = {
2765 .dev = ifp->idev->dev,
2766 .net = net,
2767 .addr = &ifp->addr,
2768 };
2769 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2770 }
2771
2772 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2773 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2774
2775 /* Remove routers and update dst entries when gateway turn into host. */
2776 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2777 {
2778 struct in6_addr *gateway = (struct in6_addr *)arg;
2779
2780 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2781 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2782 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2783 return -1;
2784 }
2785 return 0;
2786 }
2787
2788 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2789 {
2790 fib6_clean_all(net, fib6_clean_tohost, gateway);
2791 }
2792
2793 struct arg_dev_net {
2794 struct net_device *dev;
2795 struct net *net;
2796 };
2797
2798 /* called with write lock held for table with rt */
2799 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2800 {
2801 const struct arg_dev_net *adn = arg;
2802 const struct net_device *dev = adn->dev;
2803
2804 if ((rt->dst.dev == dev || !dev) &&
2805 rt != adn->net->ipv6.ip6_null_entry &&
2806 (rt->rt6i_nsiblings == 0 ||
2807 !rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
2808 return -1;
2809
2810 return 0;
2811 }
2812
2813 void rt6_ifdown(struct net *net, struct net_device *dev)
2814 {
2815 struct arg_dev_net adn = {
2816 .dev = dev,
2817 .net = net,
2818 };
2819
2820 fib6_clean_all(net, fib6_ifdown, &adn);
2821 icmp6_clean_all(fib6_ifdown, &adn);
2822 if (dev)
2823 rt6_uncached_list_flush_dev(net, dev);
2824 }
2825
2826 struct rt6_mtu_change_arg {
2827 struct net_device *dev;
2828 unsigned int mtu;
2829 };
2830
2831 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2832 {
2833 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2834 struct inet6_dev *idev;
2835
2836 /* In IPv6 pmtu discovery is not optional,
2837 so that RTAX_MTU lock cannot disable it.
2838 We still use this lock to block changes
2839 caused by addrconf/ndisc.
2840 */
2841
2842 idev = __in6_dev_get(arg->dev);
2843 if (!idev)
2844 return 0;
2845
2846 /* For administrative MTU increase, there is no way to discover
2847 IPv6 PMTU increase, so PMTU increase should be updated here.
2848 Since RFC 1981 doesn't include administrative MTU increase
2849 update PMTU increase is a MUST. (i.e. jumbo frame)
2850 */
2851 /*
2852 If new MTU is less than route PMTU, this new MTU will be the
2853 lowest MTU in the path, update the route PMTU to reflect PMTU
2854 decreases; if new MTU is greater than route PMTU, and the
2855 old MTU is the lowest MTU in the path, update the route PMTU
2856 to reflect the increase. In this case if the other nodes' MTU
2857 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2858 PMTU discovery.
2859 */
2860 if (rt->dst.dev == arg->dev &&
2861 dst_metric_raw(&rt->dst, RTAX_MTU) &&
2862 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
2863 if (rt->rt6i_flags & RTF_CACHE) {
2864 /* For RTF_CACHE with rt6i_pmtu == 0
2865 * (i.e. a redirected route),
2866 * the metrics of its rt->dst.from has already
2867 * been updated.
2868 */
2869 if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
2870 rt->rt6i_pmtu = arg->mtu;
2871 } else if (dst_mtu(&rt->dst) >= arg->mtu ||
2872 (dst_mtu(&rt->dst) < arg->mtu &&
2873 dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
2874 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2875 }
2876 }
2877 return 0;
2878 }
2879
2880 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2881 {
2882 struct rt6_mtu_change_arg arg = {
2883 .dev = dev,
2884 .mtu = mtu,
2885 };
2886
2887 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2888 }
2889
2890 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2891 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2892 [RTA_OIF] = { .type = NLA_U32 },
2893 [RTA_IIF] = { .type = NLA_U32 },
2894 [RTA_PRIORITY] = { .type = NLA_U32 },
2895 [RTA_METRICS] = { .type = NLA_NESTED },
2896 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2897 [RTA_PREF] = { .type = NLA_U8 },
2898 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
2899 [RTA_ENCAP] = { .type = NLA_NESTED },
2900 [RTA_EXPIRES] = { .type = NLA_U32 },
2901 [RTA_UID] = { .type = NLA_U32 },
2902 [RTA_MARK] = { .type = NLA_U32 },
2903 };
2904
2905 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2906 struct fib6_config *cfg)
2907 {
2908 struct rtmsg *rtm;
2909 struct nlattr *tb[RTA_MAX+1];
2910 unsigned int pref;
2911 int err;
2912
2913 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
2914 NULL);
2915 if (err < 0)
2916 goto errout;
2917
2918 err = -EINVAL;
2919 rtm = nlmsg_data(nlh);
2920 memset(cfg, 0, sizeof(*cfg));
2921
2922 cfg->fc_table = rtm->rtm_table;
2923 cfg->fc_dst_len = rtm->rtm_dst_len;
2924 cfg->fc_src_len = rtm->rtm_src_len;
2925 cfg->fc_flags = RTF_UP;
2926 cfg->fc_protocol = rtm->rtm_protocol;
2927 cfg->fc_type = rtm->rtm_type;
2928
2929 if (rtm->rtm_type == RTN_UNREACHABLE ||
2930 rtm->rtm_type == RTN_BLACKHOLE ||
2931 rtm->rtm_type == RTN_PROHIBIT ||
2932 rtm->rtm_type == RTN_THROW)
2933 cfg->fc_flags |= RTF_REJECT;
2934
2935 if (rtm->rtm_type == RTN_LOCAL)
2936 cfg->fc_flags |= RTF_LOCAL;
2937
2938 if (rtm->rtm_flags & RTM_F_CLONED)
2939 cfg->fc_flags |= RTF_CACHE;
2940
2941 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2942 cfg->fc_nlinfo.nlh = nlh;
2943 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2944
2945 if (tb[RTA_GATEWAY]) {
2946 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
2947 cfg->fc_flags |= RTF_GATEWAY;
2948 }
2949
2950 if (tb[RTA_DST]) {
2951 int plen = (rtm->rtm_dst_len + 7) >> 3;
2952
2953 if (nla_len(tb[RTA_DST]) < plen)
2954 goto errout;
2955
2956 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2957 }
2958
2959 if (tb[RTA_SRC]) {
2960 int plen = (rtm->rtm_src_len + 7) >> 3;
2961
2962 if (nla_len(tb[RTA_SRC]) < plen)
2963 goto errout;
2964
2965 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2966 }
2967
2968 if (tb[RTA_PREFSRC])
2969 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
2970
2971 if (tb[RTA_OIF])
2972 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2973
2974 if (tb[RTA_PRIORITY])
2975 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2976
2977 if (tb[RTA_METRICS]) {
2978 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2979 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2980 }
2981
2982 if (tb[RTA_TABLE])
2983 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2984
2985 if (tb[RTA_MULTIPATH]) {
2986 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2987 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2988
2989 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
2990 cfg->fc_mp_len);
2991 if (err < 0)
2992 goto errout;
2993 }
2994
2995 if (tb[RTA_PREF]) {
2996 pref = nla_get_u8(tb[RTA_PREF]);
2997 if (pref != ICMPV6_ROUTER_PREF_LOW &&
2998 pref != ICMPV6_ROUTER_PREF_HIGH)
2999 pref = ICMPV6_ROUTER_PREF_MEDIUM;
3000 cfg->fc_flags |= RTF_PREF(pref);
3001 }
3002
3003 if (tb[RTA_ENCAP])
3004 cfg->fc_encap = tb[RTA_ENCAP];
3005
3006 if (tb[RTA_ENCAP_TYPE]) {
3007 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
3008
3009 err = lwtunnel_valid_encap_type(cfg->fc_encap_type);
3010 if (err < 0)
3011 goto errout;
3012 }
3013
3014 if (tb[RTA_EXPIRES]) {
3015 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
3016
3017 if (addrconf_finite_timeout(timeout)) {
3018 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
3019 cfg->fc_flags |= RTF_EXPIRES;
3020 }
3021 }
3022
3023 err = 0;
3024 errout:
3025 return err;
3026 }
3027
3028 struct rt6_nh {
3029 struct rt6_info *rt6_info;
3030 struct fib6_config r_cfg;
3031 struct mx6_config mxc;
3032 struct list_head next;
3033 };
3034
3035 static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
3036 {
3037 struct rt6_nh *nh;
3038
3039 list_for_each_entry(nh, rt6_nh_list, next) {
3040 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n",
3041 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
3042 nh->r_cfg.fc_ifindex);
3043 }
3044 }
3045
3046 static int ip6_route_info_append(struct list_head *rt6_nh_list,
3047 struct rt6_info *rt, struct fib6_config *r_cfg)
3048 {
3049 struct rt6_nh *nh;
3050 struct rt6_info *rtnh;
3051 int err = -EEXIST;
3052
3053 list_for_each_entry(nh, rt6_nh_list, next) {
3054 /* check if rt6_info already exists */
3055 rtnh = nh->rt6_info;
3056
3057 if (rtnh->dst.dev == rt->dst.dev &&
3058 rtnh->rt6i_idev == rt->rt6i_idev &&
3059 ipv6_addr_equal(&rtnh->rt6i_gateway,
3060 &rt->rt6i_gateway))
3061 return err;
3062 }
3063
3064 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
3065 if (!nh)
3066 return -ENOMEM;
3067 nh->rt6_info = rt;
3068 err = ip6_convert_metrics(&nh->mxc, r_cfg);
3069 if (err) {
3070 kfree(nh);
3071 return err;
3072 }
3073 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
3074 list_add_tail(&nh->next, rt6_nh_list);
3075
3076 return 0;
3077 }
3078
3079 static void ip6_route_mpath_notify(struct rt6_info *rt,
3080 struct rt6_info *rt_last,
3081 struct nl_info *info,
3082 __u16 nlflags)
3083 {
3084 /* if this is an APPEND route, then rt points to the first route
3085 * inserted and rt_last points to last route inserted. Userspace
3086 * wants a consistent dump of the route which starts at the first
3087 * nexthop. Since sibling routes are always added at the end of
3088 * the list, find the first sibling of the last route appended
3089 */
3090 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) {
3091 rt = list_first_entry(&rt_last->rt6i_siblings,
3092 struct rt6_info,
3093 rt6i_siblings);
3094 }
3095
3096 if (rt)
3097 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
3098 }
3099
3100 static int ip6_route_multipath_add(struct fib6_config *cfg)
3101 {
3102 struct rt6_info *rt_notif = NULL, *rt_last = NULL;
3103 struct nl_info *info = &cfg->fc_nlinfo;
3104 struct fib6_config r_cfg;
3105 struct rtnexthop *rtnh;
3106 struct rt6_info *rt;
3107 struct rt6_nh *err_nh;
3108 struct rt6_nh *nh, *nh_safe;
3109 __u16 nlflags;
3110 int remaining;
3111 int attrlen;
3112 int err = 1;
3113 int nhn = 0;
3114 int replace = (cfg->fc_nlinfo.nlh &&
3115 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
3116 LIST_HEAD(rt6_nh_list);
3117
3118 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
3119 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
3120 nlflags |= NLM_F_APPEND;
3121
3122 remaining = cfg->fc_mp_len;
3123 rtnh = (struct rtnexthop *)cfg->fc_mp;
3124
3125 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
3126 * rt6_info structs per nexthop
3127 */
3128 while (rtnh_ok(rtnh, remaining)) {
3129 memcpy(&r_cfg, cfg, sizeof(*cfg));
3130 if (rtnh->rtnh_ifindex)
3131 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3132
3133 attrlen = rtnh_attrlen(rtnh);
3134 if (attrlen > 0) {
3135 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3136
3137 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3138 if (nla) {
3139 r_cfg.fc_gateway = nla_get_in6_addr(nla);
3140 r_cfg.fc_flags |= RTF_GATEWAY;
3141 }
3142 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
3143 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
3144 if (nla)
3145 r_cfg.fc_encap_type = nla_get_u16(nla);
3146 }
3147
3148 rt = ip6_route_info_create(&r_cfg);
3149 if (IS_ERR(rt)) {
3150 err = PTR_ERR(rt);
3151 rt = NULL;
3152 goto cleanup;
3153 }
3154
3155 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
3156 if (err) {
3157 dst_free(&rt->dst);
3158 goto cleanup;
3159 }
3160
3161 rtnh = rtnh_next(rtnh, &remaining);
3162 }
3163
3164 /* for add and replace send one notification with all nexthops.
3165 * Skip the notification in fib6_add_rt2node and send one with
3166 * the full route when done
3167 */
3168 info->skip_notify = 1;
3169
3170 err_nh = NULL;
3171 list_for_each_entry(nh, &rt6_nh_list, next) {
3172 rt_last = nh->rt6_info;
3173 err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc);
3174 /* save reference to first route for notification */
3175 if (!rt_notif && !err)
3176 rt_notif = nh->rt6_info;
3177
3178 /* nh->rt6_info is used or freed at this point, reset to NULL*/
3179 nh->rt6_info = NULL;
3180 if (err) {
3181 if (replace && nhn)
3182 ip6_print_replace_route_err(&rt6_nh_list);
3183 err_nh = nh;
3184 goto add_errout;
3185 }
3186
3187 /* Because each route is added like a single route we remove
3188 * these flags after the first nexthop: if there is a collision,
3189 * we have already failed to add the first nexthop:
3190 * fib6_add_rt2node() has rejected it; when replacing, old
3191 * nexthops have been replaced by first new, the rest should
3192 * be added to it.
3193 */
3194 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
3195 NLM_F_REPLACE);
3196 nhn++;
3197 }
3198
3199 /* success ... tell user about new route */
3200 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
3201 goto cleanup;
3202
3203 add_errout:
3204 /* send notification for routes that were added so that
3205 * the delete notifications sent by ip6_route_del are
3206 * coherent
3207 */
3208 if (rt_notif)
3209 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
3210
3211 /* Delete routes that were already added */
3212 list_for_each_entry(nh, &rt6_nh_list, next) {
3213 if (err_nh == nh)
3214 break;
3215 ip6_route_del(&nh->r_cfg);
3216 }
3217
3218 cleanup:
3219 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
3220 if (nh->rt6_info)
3221 dst_free(&nh->rt6_info->dst);
3222 kfree(nh->mxc.mx);
3223 list_del(&nh->next);
3224 kfree(nh);
3225 }
3226
3227 return err;
3228 }
3229
3230 static int ip6_route_multipath_del(struct fib6_config *cfg)
3231 {
3232 struct fib6_config r_cfg;
3233 struct rtnexthop *rtnh;
3234 int remaining;
3235 int attrlen;
3236 int err = 1, last_err = 0;
3237
3238 remaining = cfg->fc_mp_len;
3239 rtnh = (struct rtnexthop *)cfg->fc_mp;
3240
3241 /* Parse a Multipath Entry */
3242 while (rtnh_ok(rtnh, remaining)) {
3243 memcpy(&r_cfg, cfg, sizeof(*cfg));
3244 if (rtnh->rtnh_ifindex)
3245 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
3246
3247 attrlen = rtnh_attrlen(rtnh);
3248 if (attrlen > 0) {
3249 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
3250
3251 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
3252 if (nla) {
3253 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
3254 r_cfg.fc_flags |= RTF_GATEWAY;
3255 }
3256 }
3257 err = ip6_route_del(&r_cfg);
3258 if (err)
3259 last_err = err;
3260
3261 rtnh = rtnh_next(rtnh, &remaining);
3262 }
3263
3264 return last_err;
3265 }
3266
3267 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
3268 struct netlink_ext_ack *extack)
3269 {
3270 struct fib6_config cfg;
3271 int err;
3272
3273 err = rtm_to_fib6_config(skb, nlh, &cfg);
3274 if (err < 0)
3275 return err;
3276
3277 if (cfg.fc_mp)
3278 return ip6_route_multipath_del(&cfg);
3279 else {
3280 cfg.fc_delete_all_nh = 1;
3281 return ip6_route_del(&cfg);
3282 }
3283 }
3284
3285 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
3286 struct netlink_ext_ack *extack)
3287 {
3288 struct fib6_config cfg;
3289 int err;
3290
3291 err = rtm_to_fib6_config(skb, nlh, &cfg);
3292 if (err < 0)
3293 return err;
3294
3295 if (cfg.fc_mp)
3296 return ip6_route_multipath_add(&cfg);
3297 else
3298 return ip6_route_add(&cfg);
3299 }
3300
3301 static size_t rt6_nlmsg_size(struct rt6_info *rt)
3302 {
3303 int nexthop_len = 0;
3304
3305 if (rt->rt6i_nsiblings) {
3306 nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
3307 + NLA_ALIGN(sizeof(struct rtnexthop))
3308 + nla_total_size(16) /* RTA_GATEWAY */
3309 + lwtunnel_get_encap_size(rt->dst.lwtstate);
3310
3311 nexthop_len *= rt->rt6i_nsiblings;
3312 }
3313
3314 return NLMSG_ALIGN(sizeof(struct rtmsg))
3315 + nla_total_size(16) /* RTA_SRC */
3316 + nla_total_size(16) /* RTA_DST */
3317 + nla_total_size(16) /* RTA_GATEWAY */
3318 + nla_total_size(16) /* RTA_PREFSRC */
3319 + nla_total_size(4) /* RTA_TABLE */
3320 + nla_total_size(4) /* RTA_IIF */
3321 + nla_total_size(4) /* RTA_OIF */
3322 + nla_total_size(4) /* RTA_PRIORITY */
3323 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
3324 + nla_total_size(sizeof(struct rta_cacheinfo))
3325 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
3326 + nla_total_size(1) /* RTA_PREF */
3327 + lwtunnel_get_encap_size(rt->dst.lwtstate)
3328 + nexthop_len;
3329 }
3330
3331 static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
3332 unsigned int *flags, bool skip_oif)
3333 {
3334 if (!netif_running(rt->dst.dev) || !netif_carrier_ok(rt->dst.dev)) {
3335 *flags |= RTNH_F_LINKDOWN;
3336 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
3337 *flags |= RTNH_F_DEAD;
3338 }
3339
3340 if (rt->rt6i_flags & RTF_GATEWAY) {
3341 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
3342 goto nla_put_failure;
3343 }
3344
3345 /* not needed for multipath encoding b/c it has a rtnexthop struct */
3346 if (!skip_oif && rt->dst.dev &&
3347 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
3348 goto nla_put_failure;
3349
3350 if (rt->dst.lwtstate &&
3351 lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
3352 goto nla_put_failure;
3353
3354 return 0;
3355
3356 nla_put_failure:
3357 return -EMSGSIZE;
3358 }
3359
3360 /* add multipath next hop */
3361 static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
3362 {
3363 struct rtnexthop *rtnh;
3364 unsigned int flags = 0;
3365
3366 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
3367 if (!rtnh)
3368 goto nla_put_failure;
3369
3370 rtnh->rtnh_hops = 0;
3371 rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0;
3372
3373 if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
3374 goto nla_put_failure;
3375
3376 rtnh->rtnh_flags = flags;
3377
3378 /* length of rtnetlink header + attributes */
3379 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
3380
3381 return 0;
3382
3383 nla_put_failure:
3384 return -EMSGSIZE;
3385 }
3386
3387 static int rt6_fill_node(struct net *net,
3388 struct sk_buff *skb, struct rt6_info *rt,
3389 struct in6_addr *dst, struct in6_addr *src,
3390 int iif, int type, u32 portid, u32 seq,
3391 unsigned int flags)
3392 {
3393 u32 metrics[RTAX_MAX];
3394 struct rtmsg *rtm;
3395 struct nlmsghdr *nlh;
3396 long expires;
3397 u32 table;
3398
3399 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
3400 if (!nlh)
3401 return -EMSGSIZE;
3402
3403 rtm = nlmsg_data(nlh);
3404 rtm->rtm_family = AF_INET6;
3405 rtm->rtm_dst_len = rt->rt6i_dst.plen;
3406 rtm->rtm_src_len = rt->rt6i_src.plen;
3407 rtm->rtm_tos = 0;
3408 if (rt->rt6i_table)
3409 table = rt->rt6i_table->tb6_id;
3410 else
3411 table = RT6_TABLE_UNSPEC;
3412 rtm->rtm_table = table;
3413 if (nla_put_u32(skb, RTA_TABLE, table))
3414 goto nla_put_failure;
3415 if (rt->rt6i_flags & RTF_REJECT) {
3416 switch (rt->dst.error) {
3417 case -EINVAL:
3418 rtm->rtm_type = RTN_BLACKHOLE;
3419 break;
3420 case -EACCES:
3421 rtm->rtm_type = RTN_PROHIBIT;
3422 break;
3423 case -EAGAIN:
3424 rtm->rtm_type = RTN_THROW;
3425 break;
3426 default:
3427 rtm->rtm_type = RTN_UNREACHABLE;
3428 break;
3429 }
3430 }
3431 else if (rt->rt6i_flags & RTF_LOCAL)
3432 rtm->rtm_type = RTN_LOCAL;
3433 else if (rt->rt6i_flags & RTF_ANYCAST)
3434 rtm->rtm_type = RTN_ANYCAST;
3435 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
3436 rtm->rtm_type = RTN_LOCAL;
3437 else
3438 rtm->rtm_type = RTN_UNICAST;
3439 rtm->rtm_flags = 0;
3440 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
3441 rtm->rtm_protocol = rt->rt6i_protocol;
3442 if (rt->rt6i_flags & RTF_DYNAMIC)
3443 rtm->rtm_protocol = RTPROT_REDIRECT;
3444 else if (rt->rt6i_flags & RTF_ADDRCONF) {
3445 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
3446 rtm->rtm_protocol = RTPROT_RA;
3447 else
3448 rtm->rtm_protocol = RTPROT_KERNEL;
3449 }
3450
3451 if (rt->rt6i_flags & RTF_CACHE)
3452 rtm->rtm_flags |= RTM_F_CLONED;
3453
3454 if (dst) {
3455 if (nla_put_in6_addr(skb, RTA_DST, dst))
3456 goto nla_put_failure;
3457 rtm->rtm_dst_len = 128;
3458 } else if (rtm->rtm_dst_len)
3459 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
3460 goto nla_put_failure;
3461 #ifdef CONFIG_IPV6_SUBTREES
3462 if (src) {
3463 if (nla_put_in6_addr(skb, RTA_SRC, src))
3464 goto nla_put_failure;
3465 rtm->rtm_src_len = 128;
3466 } else if (rtm->rtm_src_len &&
3467 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
3468 goto nla_put_failure;
3469 #endif
3470 if (iif) {
3471 #ifdef CONFIG_IPV6_MROUTE
3472 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
3473 int err = ip6mr_get_route(net, skb, rtm, portid);
3474
3475 if (err == 0)
3476 return 0;
3477 if (err < 0)
3478 goto nla_put_failure;
3479 } else
3480 #endif
3481 if (nla_put_u32(skb, RTA_IIF, iif))
3482 goto nla_put_failure;
3483 } else if (dst) {
3484 struct in6_addr saddr_buf;
3485 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
3486 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3487 goto nla_put_failure;
3488 }
3489
3490 if (rt->rt6i_prefsrc.plen) {
3491 struct in6_addr saddr_buf;
3492 saddr_buf = rt->rt6i_prefsrc.addr;
3493 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
3494 goto nla_put_failure;
3495 }
3496
3497 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
3498 if (rt->rt6i_pmtu)
3499 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
3500 if (rtnetlink_put_metrics(skb, metrics) < 0)
3501 goto nla_put_failure;
3502
3503 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
3504 goto nla_put_failure;
3505
3506 /* For multipath routes, walk the siblings list and add
3507 * each as a nexthop within RTA_MULTIPATH.
3508 */
3509 if (rt->rt6i_nsiblings) {
3510 struct rt6_info *sibling, *next_sibling;
3511 struct nlattr *mp;
3512
3513 mp = nla_nest_start(skb, RTA_MULTIPATH);
3514 if (!mp)
3515 goto nla_put_failure;
3516
3517 if (rt6_add_nexthop(skb, rt) < 0)
3518 goto nla_put_failure;
3519
3520 list_for_each_entry_safe(sibling, next_sibling,
3521 &rt->rt6i_siblings, rt6i_siblings) {
3522 if (rt6_add_nexthop(skb, sibling) < 0)
3523 goto nla_put_failure;
3524 }
3525
3526 nla_nest_end(skb, mp);
3527 } else {
3528 if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
3529 goto nla_put_failure;
3530 }
3531
3532 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
3533
3534 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
3535 goto nla_put_failure;
3536
3537 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
3538 goto nla_put_failure;
3539
3540
3541 nlmsg_end(skb, nlh);
3542 return 0;
3543
3544 nla_put_failure:
3545 nlmsg_cancel(skb, nlh);
3546 return -EMSGSIZE;
3547 }
3548
3549 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
3550 {
3551 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
3552 struct net *net = arg->net;
3553
3554 if (rt == net->ipv6.ip6_null_entry)
3555 return 0;
3556
3557 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
3558 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
3559
3560 /* user wants prefix routes only */
3561 if (rtm->rtm_flags & RTM_F_PREFIX &&
3562 !(rt->rt6i_flags & RTF_PREFIX_RT)) {
3563 /* success since this is not a prefix route */
3564 return 1;
3565 }
3566 }
3567
3568 return rt6_fill_node(net,
3569 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
3570 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
3571 NLM_F_MULTI);
3572 }
3573
3574 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3575 struct netlink_ext_ack *extack)
3576 {
3577 struct net *net = sock_net(in_skb->sk);
3578 struct nlattr *tb[RTA_MAX+1];
3579 struct rt6_info *rt;
3580 struct sk_buff *skb;
3581 struct rtmsg *rtm;
3582 struct flowi6 fl6;
3583 int err, iif = 0, oif = 0;
3584
3585 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
3586 extack);
3587 if (err < 0)
3588 goto errout;
3589
3590 err = -EINVAL;
3591 memset(&fl6, 0, sizeof(fl6));
3592 rtm = nlmsg_data(nlh);
3593 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
3594
3595 if (tb[RTA_SRC]) {
3596 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
3597 goto errout;
3598
3599 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
3600 }
3601
3602 if (tb[RTA_DST]) {
3603 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
3604 goto errout;
3605
3606 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
3607 }
3608
3609 if (tb[RTA_IIF])
3610 iif = nla_get_u32(tb[RTA_IIF]);
3611
3612 if (tb[RTA_OIF])
3613 oif = nla_get_u32(tb[RTA_OIF]);
3614
3615 if (tb[RTA_MARK])
3616 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
3617
3618 if (tb[RTA_UID])
3619 fl6.flowi6_uid = make_kuid(current_user_ns(),
3620 nla_get_u32(tb[RTA_UID]));
3621 else
3622 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
3623
3624 if (iif) {
3625 struct net_device *dev;
3626 int flags = 0;
3627
3628 dev = __dev_get_by_index(net, iif);
3629 if (!dev) {
3630 err = -ENODEV;
3631 goto errout;
3632 }
3633
3634 fl6.flowi6_iif = iif;
3635
3636 if (!ipv6_addr_any(&fl6.saddr))
3637 flags |= RT6_LOOKUP_F_HAS_SADDR;
3638
3639 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
3640 flags);
3641 } else {
3642 fl6.flowi6_oif = oif;
3643
3644 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
3645 }
3646
3647 if (rt == net->ipv6.ip6_null_entry) {
3648 err = rt->dst.error;
3649 ip6_rt_put(rt);
3650 goto errout;
3651 }
3652
3653 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
3654 if (!skb) {
3655 ip6_rt_put(rt);
3656 err = -ENOBUFS;
3657 goto errout;
3658 }
3659
3660 skb_dst_set(skb, &rt->dst);
3661
3662 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
3663 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
3664 nlh->nlmsg_seq, 0);
3665 if (err < 0) {
3666 kfree_skb(skb);
3667 goto errout;
3668 }
3669
3670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3671 errout:
3672 return err;
3673 }
3674
3675 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
3676 unsigned int nlm_flags)
3677 {
3678 struct sk_buff *skb;
3679 struct net *net = info->nl_net;
3680 u32 seq;
3681 int err;
3682
3683 err = -ENOBUFS;
3684 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3685
3686 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3687 if (!skb)
3688 goto errout;
3689
3690 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
3691 event, info->portid, seq, nlm_flags);
3692 if (err < 0) {
3693 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
3694 WARN_ON(err == -EMSGSIZE);
3695 kfree_skb(skb);
3696 goto errout;
3697 }
3698 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3699 info->nlh, gfp_any());
3700 return;
3701 errout:
3702 if (err < 0)
3703 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
3704 }
3705
3706 static int ip6_route_dev_notify(struct notifier_block *this,
3707 unsigned long event, void *ptr)
3708 {
3709 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3710 struct net *net = dev_net(dev);
3711
3712 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
3713 net->ipv6.ip6_null_entry->dst.dev = dev;
3714 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
3715 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3716 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
3717 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
3718 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
3719 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
3720 #endif
3721 }
3722
3723 return NOTIFY_OK;
3724 }
3725
3726 /*
3727 * /proc
3728 */
3729
3730 #ifdef CONFIG_PROC_FS
3731
3732 static const struct file_operations ipv6_route_proc_fops = {
3733 .owner = THIS_MODULE,
3734 .open = ipv6_route_open,
3735 .read = seq_read,
3736 .llseek = seq_lseek,
3737 .release = seq_release_net,
3738 };
3739
3740 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
3741 {
3742 struct net *net = (struct net *)seq->private;
3743 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
3744 net->ipv6.rt6_stats->fib_nodes,
3745 net->ipv6.rt6_stats->fib_route_nodes,
3746 net->ipv6.rt6_stats->fib_rt_alloc,
3747 net->ipv6.rt6_stats->fib_rt_entries,
3748 net->ipv6.rt6_stats->fib_rt_cache,
3749 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
3750 net->ipv6.rt6_stats->fib_discarded_routes);
3751
3752 return 0;
3753 }
3754
3755 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
3756 {
3757 return single_open_net(inode, file, rt6_stats_seq_show);
3758 }
3759
3760 static const struct file_operations rt6_stats_seq_fops = {
3761 .owner = THIS_MODULE,
3762 .open = rt6_stats_seq_open,
3763 .read = seq_read,
3764 .llseek = seq_lseek,
3765 .release = single_release_net,
3766 };
3767 #endif /* CONFIG_PROC_FS */
3768
3769 #ifdef CONFIG_SYSCTL
3770
3771 static
3772 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
3773 void __user *buffer, size_t *lenp, loff_t *ppos)
3774 {
3775 struct net *net;
3776 int delay;
3777 if (!write)
3778 return -EINVAL;
3779
3780 net = (struct net *)ctl->extra1;
3781 delay = net->ipv6.sysctl.flush_delay;
3782 proc_dointvec(ctl, write, buffer, lenp, ppos);
3783 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
3784 return 0;
3785 }
3786
3787 struct ctl_table ipv6_route_table_template[] = {
3788 {
3789 .procname = "flush",
3790 .data = &init_net.ipv6.sysctl.flush_delay,
3791 .maxlen = sizeof(int),
3792 .mode = 0200,
3793 .proc_handler = ipv6_sysctl_rtcache_flush
3794 },
3795 {
3796 .procname = "gc_thresh",
3797 .data = &ip6_dst_ops_template.gc_thresh,
3798 .maxlen = sizeof(int),
3799 .mode = 0644,
3800 .proc_handler = proc_dointvec,
3801 },
3802 {
3803 .procname = "max_size",
3804 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
3805 .maxlen = sizeof(int),
3806 .mode = 0644,
3807 .proc_handler = proc_dointvec,
3808 },
3809 {
3810 .procname = "gc_min_interval",
3811 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3812 .maxlen = sizeof(int),
3813 .mode = 0644,
3814 .proc_handler = proc_dointvec_jiffies,
3815 },
3816 {
3817 .procname = "gc_timeout",
3818 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
3819 .maxlen = sizeof(int),
3820 .mode = 0644,
3821 .proc_handler = proc_dointvec_jiffies,
3822 },
3823 {
3824 .procname = "gc_interval",
3825 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
3826 .maxlen = sizeof(int),
3827 .mode = 0644,
3828 .proc_handler = proc_dointvec_jiffies,
3829 },
3830 {
3831 .procname = "gc_elasticity",
3832 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
3833 .maxlen = sizeof(int),
3834 .mode = 0644,
3835 .proc_handler = proc_dointvec,
3836 },
3837 {
3838 .procname = "mtu_expires",
3839 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
3840 .maxlen = sizeof(int),
3841 .mode = 0644,
3842 .proc_handler = proc_dointvec_jiffies,
3843 },
3844 {
3845 .procname = "min_adv_mss",
3846 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
3847 .maxlen = sizeof(int),
3848 .mode = 0644,
3849 .proc_handler = proc_dointvec,
3850 },
3851 {
3852 .procname = "gc_min_interval_ms",
3853 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
3854 .maxlen = sizeof(int),
3855 .mode = 0644,
3856 .proc_handler = proc_dointvec_ms_jiffies,
3857 },
3858 { }
3859 };
3860
3861 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
3862 {
3863 struct ctl_table *table;
3864
3865 table = kmemdup(ipv6_route_table_template,
3866 sizeof(ipv6_route_table_template),
3867 GFP_KERNEL);
3868
3869 if (table) {
3870 table[0].data = &net->ipv6.sysctl.flush_delay;
3871 table[0].extra1 = net;
3872 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
3873 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
3874 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3875 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
3876 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
3877 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
3878 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
3879 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
3880 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
3881
3882 /* Don't export sysctls to unprivileged users */
3883 if (net->user_ns != &init_user_ns)
3884 table[0].procname = NULL;
3885 }
3886
3887 return table;
3888 }
3889 #endif
3890
3891 static int __net_init ip6_route_net_init(struct net *net)
3892 {
3893 int ret = -ENOMEM;
3894
3895 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3896 sizeof(net->ipv6.ip6_dst_ops));
3897
3898 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3899 goto out_ip6_dst_ops;
3900
3901 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3902 sizeof(*net->ipv6.ip6_null_entry),
3903 GFP_KERNEL);
3904 if (!net->ipv6.ip6_null_entry)
3905 goto out_ip6_dst_entries;
3906 net->ipv6.ip6_null_entry->dst.path =
3907 (struct dst_entry *)net->ipv6.ip6_null_entry;
3908 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3909 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3910 ip6_template_metrics, true);
3911
3912 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3913 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3914 sizeof(*net->ipv6.ip6_prohibit_entry),
3915 GFP_KERNEL);
3916 if (!net->ipv6.ip6_prohibit_entry)
3917 goto out_ip6_null_entry;
3918 net->ipv6.ip6_prohibit_entry->dst.path =
3919 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3920 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3921 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3922 ip6_template_metrics, true);
3923
3924 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3925 sizeof(*net->ipv6.ip6_blk_hole_entry),
3926 GFP_KERNEL);
3927 if (!net->ipv6.ip6_blk_hole_entry)
3928 goto out_ip6_prohibit_entry;
3929 net->ipv6.ip6_blk_hole_entry->dst.path =
3930 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3931 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3932 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3933 ip6_template_metrics, true);
3934 #endif
3935
3936 net->ipv6.sysctl.flush_delay = 0;
3937 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3938 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3939 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3940 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3941 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3942 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3943 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3944
3945 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3946
3947 ret = 0;
3948 out:
3949 return ret;
3950
3951 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3952 out_ip6_prohibit_entry:
3953 kfree(net->ipv6.ip6_prohibit_entry);
3954 out_ip6_null_entry:
3955 kfree(net->ipv6.ip6_null_entry);
3956 #endif
3957 out_ip6_dst_entries:
3958 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3959 out_ip6_dst_ops:
3960 goto out;
3961 }
3962
3963 static void __net_exit ip6_route_net_exit(struct net *net)
3964 {
3965 kfree(net->ipv6.ip6_null_entry);
3966 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3967 kfree(net->ipv6.ip6_prohibit_entry);
3968 kfree(net->ipv6.ip6_blk_hole_entry);
3969 #endif
3970 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3971 }
3972
3973 static int __net_init ip6_route_net_init_late(struct net *net)
3974 {
3975 #ifdef CONFIG_PROC_FS
3976 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3977 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3978 #endif
3979 return 0;
3980 }
3981
3982 static void __net_exit ip6_route_net_exit_late(struct net *net)
3983 {
3984 #ifdef CONFIG_PROC_FS
3985 remove_proc_entry("ipv6_route", net->proc_net);
3986 remove_proc_entry("rt6_stats", net->proc_net);
3987 #endif
3988 }
3989
3990 static struct pernet_operations ip6_route_net_ops = {
3991 .init = ip6_route_net_init,
3992 .exit = ip6_route_net_exit,
3993 };
3994
3995 static int __net_init ipv6_inetpeer_init(struct net *net)
3996 {
3997 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3998
3999 if (!bp)
4000 return -ENOMEM;
4001 inet_peer_base_init(bp);
4002 net->ipv6.peers = bp;
4003 return 0;
4004 }
4005
4006 static void __net_exit ipv6_inetpeer_exit(struct net *net)
4007 {
4008 struct inet_peer_base *bp = net->ipv6.peers;
4009
4010 net->ipv6.peers = NULL;
4011 inetpeer_invalidate_tree(bp);
4012 kfree(bp);
4013 }
4014
4015 static struct pernet_operations ipv6_inetpeer_ops = {
4016 .init = ipv6_inetpeer_init,
4017 .exit = ipv6_inetpeer_exit,
4018 };
4019
4020 static struct pernet_operations ip6_route_net_late_ops = {
4021 .init = ip6_route_net_init_late,
4022 .exit = ip6_route_net_exit_late,
4023 };
4024
4025 static struct notifier_block ip6_route_dev_notifier = {
4026 .notifier_call = ip6_route_dev_notify,
4027 .priority = 0,
4028 };
4029
4030 void __init ip6_route_init_special_entries(void)
4031 {
4032 /* Registering of the loopback is done before this portion of code,
4033 * the loopback reference in rt6_info will not be taken, do it
4034 * manually for init_net */
4035 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
4036 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4037 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4038 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
4039 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4040 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
4041 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
4042 #endif
4043 }
4044
4045 int __init ip6_route_init(void)
4046 {
4047 int ret;
4048 int cpu;
4049
4050 ret = -ENOMEM;
4051 ip6_dst_ops_template.kmem_cachep =
4052 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
4053 SLAB_HWCACHE_ALIGN, NULL);
4054 if (!ip6_dst_ops_template.kmem_cachep)
4055 goto out;
4056
4057 ret = dst_entries_init(&ip6_dst_blackhole_ops);
4058 if (ret)
4059 goto out_kmem_cache;
4060
4061 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
4062 if (ret)
4063 goto out_dst_entries;
4064
4065 ret = register_pernet_subsys(&ip6_route_net_ops);
4066 if (ret)
4067 goto out_register_inetpeer;
4068
4069 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
4070
4071 ret = fib6_init();
4072 if (ret)
4073 goto out_register_subsys;
4074
4075 ret = xfrm6_init();
4076 if (ret)
4077 goto out_fib6_init;
4078
4079 ret = fib6_rules_init();
4080 if (ret)
4081 goto xfrm6_init;
4082
4083 ret = register_pernet_subsys(&ip6_route_net_late_ops);
4084 if (ret)
4085 goto fib6_rules_init;
4086
4087 ret = -ENOBUFS;
4088 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
4089 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
4090 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
4091 goto out_register_late_subsys;
4092
4093 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
4094 if (ret)
4095 goto out_register_late_subsys;
4096
4097 for_each_possible_cpu(cpu) {
4098 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
4099
4100 INIT_LIST_HEAD(&ul->head);
4101 spin_lock_init(&ul->lock);
4102 }
4103
4104 out:
4105 return ret;
4106
4107 out_register_late_subsys:
4108 unregister_pernet_subsys(&ip6_route_net_late_ops);
4109 fib6_rules_init:
4110 fib6_rules_cleanup();
4111 xfrm6_init:
4112 xfrm6_fini();
4113 out_fib6_init:
4114 fib6_gc_cleanup();
4115 out_register_subsys:
4116 unregister_pernet_subsys(&ip6_route_net_ops);
4117 out_register_inetpeer:
4118 unregister_pernet_subsys(&ipv6_inetpeer_ops);
4119 out_dst_entries:
4120 dst_entries_destroy(&ip6_dst_blackhole_ops);
4121 out_kmem_cache:
4122 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
4123 goto out;
4124 }
4125
4126 void ip6_route_cleanup(void)
4127 {
4128 unregister_netdevice_notifier(&ip6_route_dev_notifier);
4129 unregister_pernet_subsys(&ip6_route_net_late_ops);
4130 fib6_rules_cleanup();
4131 xfrm6_fini();
4132 fib6_gc_cleanup();
4133 unregister_pernet_subsys(&ipv6_inetpeer_ops);
4134 unregister_pernet_subsys(&ip6_route_net_ops);
4135 dst_entries_destroy(&ip6_dst_blackhole_ops);
4136 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
4137 }
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