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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 <linux/jhash.h>
48#include <net/net_namespace.h>
49#include <net/snmp.h>
50#include <net/ipv6.h>
51#include <net/ip6_fib.h>
52#include <net/ip6_route.h>
53#include <net/ndisc.h>
54#include <net/addrconf.h>
55#include <net/tcp.h>
56#include <linux/rtnetlink.h>
57#include <net/dst.h>
58#include <net/dst_metadata.h>
59#include <net/xfrm.h>
60#include <net/netevent.h>
61#include <net/netlink.h>
62#include <net/nexthop.h>
63#include <net/lwtunnel.h>
64#include <net/ip_tunnels.h>
65#include <net/l3mdev.h>
66#include <trace/events/fib6.h>
67
68#include <linux/uaccess.h>
69
70#ifdef CONFIG_SYSCTL
71#include <linux/sysctl.h>
72#endif
73
74enum rt6_nud_state {
75 RT6_NUD_FAIL_HARD = -3,
76 RT6_NUD_FAIL_PROBE = -2,
77 RT6_NUD_FAIL_DO_RR = -1,
78 RT6_NUD_SUCCEED = 1
79};
80
81static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
82static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
83static unsigned int ip6_default_advmss(const struct dst_entry *dst);
84static unsigned int ip6_mtu(const struct dst_entry *dst);
85static struct dst_entry *ip6_negative_advice(struct dst_entry *);
86static void ip6_dst_destroy(struct dst_entry *);
87static void ip6_dst_ifdown(struct dst_entry *,
88 struct net_device *dev, int how);
89static int ip6_dst_gc(struct dst_ops *ops);
90
91static int ip6_pkt_discard(struct sk_buff *skb);
92static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
93static int ip6_pkt_prohibit(struct sk_buff *skb);
94static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
95static void ip6_link_failure(struct sk_buff *skb);
96static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
97 struct sk_buff *skb, u32 mtu);
98static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
99 struct sk_buff *skb);
100static void rt6_dst_from_metrics_check(struct rt6_info *rt);
101static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
102static size_t rt6_nlmsg_size(struct rt6_info *rt);
103static int rt6_fill_node(struct net *net,
104 struct sk_buff *skb, struct rt6_info *rt,
105 struct in6_addr *dst, struct in6_addr *src,
106 int iif, int type, u32 portid, u32 seq,
107 unsigned int flags);
108static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt,
109 struct in6_addr *daddr,
110 struct in6_addr *saddr);
111
112#ifdef CONFIG_IPV6_ROUTE_INFO
113static struct rt6_info *rt6_add_route_info(struct net *net,
114 const struct in6_addr *prefix, int prefixlen,
115 const struct in6_addr *gwaddr,
116 struct net_device *dev,
117 unsigned int pref);
118static struct rt6_info *rt6_get_route_info(struct net *net,
119 const struct in6_addr *prefix, int prefixlen,
120 const struct in6_addr *gwaddr,
121 struct net_device *dev);
122#endif
123
124struct uncached_list {
125 spinlock_t lock;
126 struct list_head head;
127};
128
129static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
130
131void rt6_uncached_list_add(struct rt6_info *rt)
132{
133 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
134
135 rt->rt6i_uncached_list = ul;
136
137 spin_lock_bh(&ul->lock);
138 list_add_tail(&rt->rt6i_uncached, &ul->head);
139 spin_unlock_bh(&ul->lock);
140}
141
142void rt6_uncached_list_del(struct rt6_info *rt)
143{
144 if (!list_empty(&rt->rt6i_uncached)) {
145 struct uncached_list *ul = rt->rt6i_uncached_list;
146 struct net *net = dev_net(rt->dst.dev);
147
148 spin_lock_bh(&ul->lock);
149 list_del(&rt->rt6i_uncached);
150 atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
151 spin_unlock_bh(&ul->lock);
152 }
153}
154
155static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
156{
157 struct net_device *loopback_dev = net->loopback_dev;
158 int cpu;
159
160 if (dev == loopback_dev)
161 return;
162
163 for_each_possible_cpu(cpu) {
164 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
165 struct rt6_info *rt;
166
167 spin_lock_bh(&ul->lock);
168 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
169 struct inet6_dev *rt_idev = rt->rt6i_idev;
170 struct net_device *rt_dev = rt->dst.dev;
171
172 if (rt_idev->dev == dev) {
173 rt->rt6i_idev = in6_dev_get(loopback_dev);
174 in6_dev_put(rt_idev);
175 }
176
177 if (rt_dev == dev) {
178 rt->dst.dev = loopback_dev;
179 dev_hold(rt->dst.dev);
180 dev_put(rt_dev);
181 }
182 }
183 spin_unlock_bh(&ul->lock);
184 }
185}
186
187static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
188{
189 return dst_metrics_write_ptr(&rt->from->dst);
190}
191
192static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
193{
194 struct rt6_info *rt = (struct rt6_info *)dst;
195
196 if (rt->rt6i_flags & RTF_PCPU)
197 return rt6_pcpu_cow_metrics(rt);
198 else if (rt->rt6i_flags & RTF_CACHE)
199 return NULL;
200 else
201 return dst_cow_metrics_generic(dst, old);
202}
203
204static inline const void *choose_neigh_daddr(struct rt6_info *rt,
205 struct sk_buff *skb,
206 const void *daddr)
207{
208 struct in6_addr *p = &rt->rt6i_gateway;
209
210 if (!ipv6_addr_any(p))
211 return (const void *) p;
212 else if (skb)
213 return &ipv6_hdr(skb)->daddr;
214 return daddr;
215}
216
217static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
218 struct sk_buff *skb,
219 const void *daddr)
220{
221 struct rt6_info *rt = (struct rt6_info *) dst;
222 struct neighbour *n;
223
224 daddr = choose_neigh_daddr(rt, skb, daddr);
225 n = __ipv6_neigh_lookup(dst->dev, daddr);
226 if (n)
227 return n;
228 return neigh_create(&nd_tbl, daddr, dst->dev);
229}
230
231static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
232{
233 struct net_device *dev = dst->dev;
234 struct rt6_info *rt = (struct rt6_info *)dst;
235
236 daddr = choose_neigh_daddr(rt, NULL, daddr);
237 if (!daddr)
238 return;
239 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
240 return;
241 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
242 return;
243 __ipv6_confirm_neigh(dev, daddr);
244}
245
246static struct dst_ops ip6_dst_ops_template = {
247 .family = AF_INET6,
248 .gc = ip6_dst_gc,
249 .gc_thresh = 1024,
250 .check = ip6_dst_check,
251 .default_advmss = ip6_default_advmss,
252 .mtu = ip6_mtu,
253 .cow_metrics = ipv6_cow_metrics,
254 .destroy = ip6_dst_destroy,
255 .ifdown = ip6_dst_ifdown,
256 .negative_advice = ip6_negative_advice,
257 .link_failure = ip6_link_failure,
258 .update_pmtu = ip6_rt_update_pmtu,
259 .redirect = rt6_do_redirect,
260 .local_out = __ip6_local_out,
261 .neigh_lookup = ip6_neigh_lookup,
262 .confirm_neigh = ip6_confirm_neigh,
263};
264
265static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
266{
267 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
268
269 return mtu ? : dst->dev->mtu;
270}
271
272static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
273 struct sk_buff *skb, u32 mtu)
274{
275}
276
277static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
278 struct sk_buff *skb)
279{
280}
281
282static struct dst_ops ip6_dst_blackhole_ops = {
283 .family = AF_INET6,
284 .destroy = ip6_dst_destroy,
285 .check = ip6_dst_check,
286 .mtu = ip6_blackhole_mtu,
287 .default_advmss = ip6_default_advmss,
288 .update_pmtu = ip6_rt_blackhole_update_pmtu,
289 .redirect = ip6_rt_blackhole_redirect,
290 .cow_metrics = dst_cow_metrics_generic,
291 .neigh_lookup = ip6_neigh_lookup,
292};
293
294static const u32 ip6_template_metrics[RTAX_MAX] = {
295 [RTAX_HOPLIMIT - 1] = 0,
296};
297
298static const struct rt6_info ip6_null_entry_template = {
299 .dst = {
300 .__refcnt = ATOMIC_INIT(1),
301 .__use = 1,
302 .obsolete = DST_OBSOLETE_FORCE_CHK,
303 .error = -ENETUNREACH,
304 .input = ip6_pkt_discard,
305 .output = ip6_pkt_discard_out,
306 },
307 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
308 .rt6i_protocol = RTPROT_KERNEL,
309 .rt6i_metric = ~(u32) 0,
310 .rt6i_ref = ATOMIC_INIT(1),
311};
312
313#ifdef CONFIG_IPV6_MULTIPLE_TABLES
314
315static const struct rt6_info ip6_prohibit_entry_template = {
316 .dst = {
317 .__refcnt = ATOMIC_INIT(1),
318 .__use = 1,
319 .obsolete = DST_OBSOLETE_FORCE_CHK,
320 .error = -EACCES,
321 .input = ip6_pkt_prohibit,
322 .output = ip6_pkt_prohibit_out,
323 },
324 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
325 .rt6i_protocol = RTPROT_KERNEL,
326 .rt6i_metric = ~(u32) 0,
327 .rt6i_ref = ATOMIC_INIT(1),
328};
329
330static const struct rt6_info ip6_blk_hole_entry_template = {
331 .dst = {
332 .__refcnt = ATOMIC_INIT(1),
333 .__use = 1,
334 .obsolete = DST_OBSOLETE_FORCE_CHK,
335 .error = -EINVAL,
336 .input = dst_discard,
337 .output = dst_discard_out,
338 },
339 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
340 .rt6i_protocol = RTPROT_KERNEL,
341 .rt6i_metric = ~(u32) 0,
342 .rt6i_ref = ATOMIC_INIT(1),
343};
344
345#endif
346
347static void rt6_info_init(struct rt6_info *rt)
348{
349 struct dst_entry *dst = &rt->dst;
350
351 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
352 INIT_LIST_HEAD(&rt->rt6i_siblings);
353 INIT_LIST_HEAD(&rt->rt6i_uncached);
354}
355
356/* allocate dst with ip6_dst_ops */
357static struct rt6_info *__ip6_dst_alloc(struct net *net,
358 struct net_device *dev,
359 int flags)
360{
361 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
362 1, DST_OBSOLETE_FORCE_CHK, flags);
363
364 if (rt) {
365 rt6_info_init(rt);
366 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
367 }
368
369 return rt;
370}
371
372struct rt6_info *ip6_dst_alloc(struct net *net,
373 struct net_device *dev,
374 int flags)
375{
376 struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
377
378 if (rt) {
379 rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
380 if (!rt->rt6i_pcpu) {
381 dst_release_immediate(&rt->dst);
382 return NULL;
383 }
384 }
385
386 return rt;
387}
388EXPORT_SYMBOL(ip6_dst_alloc);
389
390static void ip6_dst_destroy(struct dst_entry *dst)
391{
392 struct rt6_info *rt = (struct rt6_info *)dst;
393 struct rt6_exception_bucket *bucket;
394 struct rt6_info *from = rt->from;
395 struct inet6_dev *idev;
396
397 dst_destroy_metrics_generic(dst);
398 free_percpu(rt->rt6i_pcpu);
399 rt6_uncached_list_del(rt);
400
401 idev = rt->rt6i_idev;
402 if (idev) {
403 rt->rt6i_idev = NULL;
404 in6_dev_put(idev);
405 }
406 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket, 1);
407 if (bucket) {
408 rt->rt6i_exception_bucket = NULL;
409 kfree(bucket);
410 }
411
412 rt->from = NULL;
413 dst_release(&from->dst);
414}
415
416static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
417 int how)
418{
419 struct rt6_info *rt = (struct rt6_info *)dst;
420 struct inet6_dev *idev = rt->rt6i_idev;
421 struct net_device *loopback_dev =
422 dev_net(dev)->loopback_dev;
423
424 if (idev && idev->dev != loopback_dev) {
425 struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
426 if (loopback_idev) {
427 rt->rt6i_idev = loopback_idev;
428 in6_dev_put(idev);
429 }
430 }
431}
432
433static 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
441static 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->from) {
447 return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
448 rt6_check_expired(rt->from);
449 }
450 return false;
451}
452
453static struct rt6_info *rt6_multipath_select(const struct net *net,
454 struct rt6_info *match,
455 struct flowi6 *fl6, int oif,
456 const struct sk_buff *skb,
457 int strict)
458{
459 struct rt6_info *sibling, *next_sibling;
460
461 /* We might have already computed the hash for ICMPv6 errors. In such
462 * case it will always be non-zero. Otherwise now is the time to do it.
463 */
464 if (!fl6->mp_hash)
465 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
466
467 if (fl6->mp_hash <= atomic_read(&match->rt6i_nh_upper_bound))
468 return match;
469
470 list_for_each_entry_safe(sibling, next_sibling, &match->rt6i_siblings,
471 rt6i_siblings) {
472 if (fl6->mp_hash > atomic_read(&sibling->rt6i_nh_upper_bound))
473 continue;
474 if (rt6_score_route(sibling, oif, strict) < 0)
475 break;
476 match = sibling;
477 break;
478 }
479
480 return match;
481}
482
483/*
484 * Route lookup. rcu_read_lock() should be held.
485 */
486
487static inline struct rt6_info *rt6_device_match(struct net *net,
488 struct rt6_info *rt,
489 const struct in6_addr *saddr,
490 int oif,
491 int flags)
492{
493 struct rt6_info *local = NULL;
494 struct rt6_info *sprt;
495
496 if (!oif && ipv6_addr_any(saddr) && !(rt->rt6i_nh_flags & RTNH_F_DEAD))
497 return rt;
498
499 for (sprt = rt; sprt; sprt = rcu_dereference(sprt->rt6_next)) {
500 struct net_device *dev = sprt->dst.dev;
501
502 if (sprt->rt6i_nh_flags & RTNH_F_DEAD)
503 continue;
504
505 if (oif) {
506 if (dev->ifindex == oif)
507 return sprt;
508 if (dev->flags & IFF_LOOPBACK) {
509 if (!sprt->rt6i_idev ||
510 sprt->rt6i_idev->dev->ifindex != oif) {
511 if (flags & RT6_LOOKUP_F_IFACE)
512 continue;
513 if (local &&
514 local->rt6i_idev->dev->ifindex == oif)
515 continue;
516 }
517 local = sprt;
518 }
519 } else {
520 if (ipv6_chk_addr(net, saddr, dev,
521 flags & RT6_LOOKUP_F_IFACE))
522 return sprt;
523 }
524 }
525
526 if (oif) {
527 if (local)
528 return local;
529
530 if (flags & RT6_LOOKUP_F_IFACE)
531 return net->ipv6.ip6_null_entry;
532 }
533
534 return rt->rt6i_nh_flags & RTNH_F_DEAD ? net->ipv6.ip6_null_entry : rt;
535}
536
537#ifdef CONFIG_IPV6_ROUTER_PREF
538struct __rt6_probe_work {
539 struct work_struct work;
540 struct in6_addr target;
541 struct net_device *dev;
542};
543
544static void rt6_probe_deferred(struct work_struct *w)
545{
546 struct in6_addr mcaddr;
547 struct __rt6_probe_work *work =
548 container_of(w, struct __rt6_probe_work, work);
549
550 addrconf_addr_solict_mult(&work->target, &mcaddr);
551 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
552 dev_put(work->dev);
553 kfree(work);
554}
555
556static void rt6_probe(struct rt6_info *rt)
557{
558 struct __rt6_probe_work *work;
559 struct neighbour *neigh;
560 /*
561 * Okay, this does not seem to be appropriate
562 * for now, however, we need to check if it
563 * is really so; aka Router Reachability Probing.
564 *
565 * Router Reachability Probe MUST be rate-limited
566 * to no more than one per minute.
567 */
568 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
569 return;
570 rcu_read_lock_bh();
571 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
572 if (neigh) {
573 if (neigh->nud_state & NUD_VALID)
574 goto out;
575
576 work = NULL;
577 write_lock(&neigh->lock);
578 if (!(neigh->nud_state & NUD_VALID) &&
579 time_after(jiffies,
580 neigh->updated +
581 rt->rt6i_idev->cnf.rtr_probe_interval)) {
582 work = kmalloc(sizeof(*work), GFP_ATOMIC);
583 if (work)
584 __neigh_set_probe_once(neigh);
585 }
586 write_unlock(&neigh->lock);
587 } else {
588 work = kmalloc(sizeof(*work), GFP_ATOMIC);
589 }
590
591 if (work) {
592 INIT_WORK(&work->work, rt6_probe_deferred);
593 work->target = rt->rt6i_gateway;
594 dev_hold(rt->dst.dev);
595 work->dev = rt->dst.dev;
596 schedule_work(&work->work);
597 }
598
599out:
600 rcu_read_unlock_bh();
601}
602#else
603static inline void rt6_probe(struct rt6_info *rt)
604{
605}
606#endif
607
608/*
609 * Default Router Selection (RFC 2461 6.3.6)
610 */
611static inline int rt6_check_dev(struct rt6_info *rt, int oif)
612{
613 struct net_device *dev = rt->dst.dev;
614 if (!oif || dev->ifindex == oif)
615 return 2;
616 if ((dev->flags & IFF_LOOPBACK) &&
617 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
618 return 1;
619 return 0;
620}
621
622static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
623{
624 struct neighbour *neigh;
625 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
626
627 if (rt->rt6i_flags & RTF_NONEXTHOP ||
628 !(rt->rt6i_flags & RTF_GATEWAY))
629 return RT6_NUD_SUCCEED;
630
631 rcu_read_lock_bh();
632 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
633 if (neigh) {
634 read_lock(&neigh->lock);
635 if (neigh->nud_state & NUD_VALID)
636 ret = RT6_NUD_SUCCEED;
637#ifdef CONFIG_IPV6_ROUTER_PREF
638 else if (!(neigh->nud_state & NUD_FAILED))
639 ret = RT6_NUD_SUCCEED;
640 else
641 ret = RT6_NUD_FAIL_PROBE;
642#endif
643 read_unlock(&neigh->lock);
644 } else {
645 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
646 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
647 }
648 rcu_read_unlock_bh();
649
650 return ret;
651}
652
653static int rt6_score_route(struct rt6_info *rt, int oif,
654 int strict)
655{
656 int m;
657
658 m = rt6_check_dev(rt, oif);
659 if (!m && (strict & RT6_LOOKUP_F_IFACE))
660 return RT6_NUD_FAIL_HARD;
661#ifdef CONFIG_IPV6_ROUTER_PREF
662 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
663#endif
664 if (strict & RT6_LOOKUP_F_REACHABLE) {
665 int n = rt6_check_neigh(rt);
666 if (n < 0)
667 return n;
668 }
669 return m;
670}
671
672static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
673 int *mpri, struct rt6_info *match,
674 bool *do_rr)
675{
676 int m;
677 bool match_do_rr = false;
678 struct inet6_dev *idev = rt->rt6i_idev;
679
680 if (rt->rt6i_nh_flags & RTNH_F_DEAD)
681 goto out;
682
683 if (idev->cnf.ignore_routes_with_linkdown &&
684 rt->rt6i_nh_flags & RTNH_F_LINKDOWN &&
685 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
686 goto out;
687
688 if (rt6_check_expired(rt))
689 goto out;
690
691 m = rt6_score_route(rt, oif, strict);
692 if (m == RT6_NUD_FAIL_DO_RR) {
693 match_do_rr = true;
694 m = 0; /* lowest valid score */
695 } else if (m == RT6_NUD_FAIL_HARD) {
696 goto out;
697 }
698
699 if (strict & RT6_LOOKUP_F_REACHABLE)
700 rt6_probe(rt);
701
702 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
703 if (m > *mpri) {
704 *do_rr = match_do_rr;
705 *mpri = m;
706 match = rt;
707 }
708out:
709 return match;
710}
711
712static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
713 struct rt6_info *leaf,
714 struct rt6_info *rr_head,
715 u32 metric, int oif, int strict,
716 bool *do_rr)
717{
718 struct rt6_info *rt, *match, *cont;
719 int mpri = -1;
720
721 match = NULL;
722 cont = NULL;
723 for (rt = rr_head; rt; rt = rcu_dereference(rt->rt6_next)) {
724 if (rt->rt6i_metric != metric) {
725 cont = rt;
726 break;
727 }
728
729 match = find_match(rt, oif, strict, &mpri, match, do_rr);
730 }
731
732 for (rt = leaf; rt && rt != rr_head;
733 rt = rcu_dereference(rt->rt6_next)) {
734 if (rt->rt6i_metric != metric) {
735 cont = rt;
736 break;
737 }
738
739 match = find_match(rt, oif, strict, &mpri, match, do_rr);
740 }
741
742 if (match || !cont)
743 return match;
744
745 for (rt = cont; rt; rt = rcu_dereference(rt->rt6_next))
746 match = find_match(rt, oif, strict, &mpri, match, do_rr);
747
748 return match;
749}
750
751static struct rt6_info *rt6_select(struct net *net, struct fib6_node *fn,
752 int oif, int strict)
753{
754 struct rt6_info *leaf = rcu_dereference(fn->leaf);
755 struct rt6_info *match, *rt0;
756 bool do_rr = false;
757 int key_plen;
758
759 if (!leaf || leaf == net->ipv6.ip6_null_entry)
760 return net->ipv6.ip6_null_entry;
761
762 rt0 = rcu_dereference(fn->rr_ptr);
763 if (!rt0)
764 rt0 = leaf;
765
766 /* Double check to make sure fn is not an intermediate node
767 * and fn->leaf does not points to its child's leaf
768 * (This might happen if all routes under fn are deleted from
769 * the tree and fib6_repair_tree() is called on the node.)
770 */
771 key_plen = rt0->rt6i_dst.plen;
772#ifdef CONFIG_IPV6_SUBTREES
773 if (rt0->rt6i_src.plen)
774 key_plen = rt0->rt6i_src.plen;
775#endif
776 if (fn->fn_bit != key_plen)
777 return net->ipv6.ip6_null_entry;
778
779 match = find_rr_leaf(fn, leaf, rt0, rt0->rt6i_metric, oif, strict,
780 &do_rr);
781
782 if (do_rr) {
783 struct rt6_info *next = rcu_dereference(rt0->rt6_next);
784
785 /* no entries matched; do round-robin */
786 if (!next || next->rt6i_metric != rt0->rt6i_metric)
787 next = leaf;
788
789 if (next != rt0) {
790 spin_lock_bh(&leaf->rt6i_table->tb6_lock);
791 /* make sure next is not being deleted from the tree */
792 if (next->rt6i_node)
793 rcu_assign_pointer(fn->rr_ptr, next);
794 spin_unlock_bh(&leaf->rt6i_table->tb6_lock);
795 }
796 }
797
798 return match ? match : net->ipv6.ip6_null_entry;
799}
800
801static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
802{
803 return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
804}
805
806#ifdef CONFIG_IPV6_ROUTE_INFO
807int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
808 const struct in6_addr *gwaddr)
809{
810 struct net *net = dev_net(dev);
811 struct route_info *rinfo = (struct route_info *) opt;
812 struct in6_addr prefix_buf, *prefix;
813 unsigned int pref;
814 unsigned long lifetime;
815 struct rt6_info *rt;
816
817 if (len < sizeof(struct route_info)) {
818 return -EINVAL;
819 }
820
821 /* Sanity check for prefix_len and length */
822 if (rinfo->length > 3) {
823 return -EINVAL;
824 } else if (rinfo->prefix_len > 128) {
825 return -EINVAL;
826 } else if (rinfo->prefix_len > 64) {
827 if (rinfo->length < 2) {
828 return -EINVAL;
829 }
830 } else if (rinfo->prefix_len > 0) {
831 if (rinfo->length < 1) {
832 return -EINVAL;
833 }
834 }
835
836 pref = rinfo->route_pref;
837 if (pref == ICMPV6_ROUTER_PREF_INVALID)
838 return -EINVAL;
839
840 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
841
842 if (rinfo->length == 3)
843 prefix = (struct in6_addr *)rinfo->prefix;
844 else {
845 /* this function is safe */
846 ipv6_addr_prefix(&prefix_buf,
847 (struct in6_addr *)rinfo->prefix,
848 rinfo->prefix_len);
849 prefix = &prefix_buf;
850 }
851
852 if (rinfo->prefix_len == 0)
853 rt = rt6_get_dflt_router(gwaddr, dev);
854 else
855 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
856 gwaddr, dev);
857
858 if (rt && !lifetime) {
859 ip6_del_rt(rt);
860 rt = NULL;
861 }
862
863 if (!rt && lifetime)
864 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
865 dev, pref);
866 else if (rt)
867 rt->rt6i_flags = RTF_ROUTEINFO |
868 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
869
870 if (rt) {
871 if (!addrconf_finite_timeout(lifetime))
872 rt6_clean_expires(rt);
873 else
874 rt6_set_expires(rt, jiffies + HZ * lifetime);
875
876 ip6_rt_put(rt);
877 }
878 return 0;
879}
880#endif
881
882static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
883 struct in6_addr *saddr)
884{
885 struct fib6_node *pn, *sn;
886 while (1) {
887 if (fn->fn_flags & RTN_TL_ROOT)
888 return NULL;
889 pn = rcu_dereference(fn->parent);
890 sn = FIB6_SUBTREE(pn);
891 if (sn && sn != fn)
892 fn = fib6_lookup(sn, NULL, saddr);
893 else
894 fn = pn;
895 if (fn->fn_flags & RTN_RTINFO)
896 return fn;
897 }
898}
899
900static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
901 bool null_fallback)
902{
903 struct rt6_info *rt = *prt;
904
905 if (dst_hold_safe(&rt->dst))
906 return true;
907 if (null_fallback) {
908 rt = net->ipv6.ip6_null_entry;
909 dst_hold(&rt->dst);
910 } else {
911 rt = NULL;
912 }
913 *prt = rt;
914 return false;
915}
916
917static struct rt6_info *ip6_pol_route_lookup(struct net *net,
918 struct fib6_table *table,
919 struct flowi6 *fl6,
920 const struct sk_buff *skb,
921 int flags)
922{
923 struct rt6_info *rt, *rt_cache;
924 struct fib6_node *fn;
925
926 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
927 flags &= ~RT6_LOOKUP_F_IFACE;
928
929 rcu_read_lock();
930 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
931restart:
932 rt = rcu_dereference(fn->leaf);
933 if (!rt) {
934 rt = net->ipv6.ip6_null_entry;
935 } else {
936 rt = rt6_device_match(net, rt, &fl6->saddr,
937 fl6->flowi6_oif, flags);
938 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
939 rt = rt6_multipath_select(net, rt, fl6, fl6->flowi6_oif,
940 skb, flags);
941 }
942 if (rt == net->ipv6.ip6_null_entry) {
943 fn = fib6_backtrack(fn, &fl6->saddr);
944 if (fn)
945 goto restart;
946 }
947 /* Search through exception table */
948 rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr);
949 if (rt_cache)
950 rt = rt_cache;
951
952 if (ip6_hold_safe(net, &rt, true))
953 dst_use_noref(&rt->dst, jiffies);
954
955 rcu_read_unlock();
956
957 trace_fib6_table_lookup(net, rt, table, fl6);
958
959 return rt;
960
961}
962
963struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
964 const struct sk_buff *skb, int flags)
965{
966 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
967}
968EXPORT_SYMBOL_GPL(ip6_route_lookup);
969
970struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
971 const struct in6_addr *saddr, int oif,
972 const struct sk_buff *skb, int strict)
973{
974 struct flowi6 fl6 = {
975 .flowi6_oif = oif,
976 .daddr = *daddr,
977 };
978 struct dst_entry *dst;
979 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
980
981 if (saddr) {
982 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
983 flags |= RT6_LOOKUP_F_HAS_SADDR;
984 }
985
986 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
987 if (dst->error == 0)
988 return (struct rt6_info *) dst;
989
990 dst_release(dst);
991
992 return NULL;
993}
994EXPORT_SYMBOL(rt6_lookup);
995
996/* ip6_ins_rt is called with FREE table->tb6_lock.
997 * It takes new route entry, the addition fails by any reason the
998 * route is released.
999 * Caller must hold dst before calling it.
1000 */
1001
1002static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
1003 struct mx6_config *mxc,
1004 struct netlink_ext_ack *extack)
1005{
1006 int err;
1007 struct fib6_table *table;
1008
1009 table = rt->rt6i_table;
1010 spin_lock_bh(&table->tb6_lock);
1011 err = fib6_add(&table->tb6_root, rt, info, mxc, extack);
1012 spin_unlock_bh(&table->tb6_lock);
1013
1014 return err;
1015}
1016
1017int ip6_ins_rt(struct rt6_info *rt)
1018{
1019 struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
1020 struct mx6_config mxc = { .mx = NULL, };
1021
1022 /* Hold dst to account for the reference from the fib6 tree */
1023 dst_hold(&rt->dst);
1024 return __ip6_ins_rt(rt, &info, &mxc, NULL);
1025}
1026
1027/* called with rcu_lock held */
1028static struct net_device *ip6_rt_get_dev_rcu(struct rt6_info *rt)
1029{
1030 struct net_device *dev = rt->dst.dev;
1031
1032 if (rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) {
1033 /* for copies of local routes, dst->dev needs to be the
1034 * device if it is a master device, the master device if
1035 * device is enslaved, and the loopback as the default
1036 */
1037 if (netif_is_l3_slave(dev) &&
1038 !rt6_need_strict(&rt->rt6i_dst.addr))
1039 dev = l3mdev_master_dev_rcu(dev);
1040 else if (!netif_is_l3_master(dev))
1041 dev = dev_net(dev)->loopback_dev;
1042 /* last case is netif_is_l3_master(dev) is true in which
1043 * case we want dev returned to be dev
1044 */
1045 }
1046
1047 return dev;
1048}
1049
1050static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
1051 const struct in6_addr *daddr,
1052 const struct in6_addr *saddr)
1053{
1054 struct net_device *dev;
1055 struct rt6_info *rt;
1056
1057 /*
1058 * Clone the route.
1059 */
1060
1061 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
1062 ort = ort->from;
1063
1064 rcu_read_lock();
1065 dev = ip6_rt_get_dev_rcu(ort);
1066 rt = __ip6_dst_alloc(dev_net(dev), dev, 0);
1067 rcu_read_unlock();
1068 if (!rt)
1069 return NULL;
1070
1071 ip6_rt_copy_init(rt, ort);
1072 rt->rt6i_flags |= RTF_CACHE;
1073 rt->rt6i_metric = 0;
1074 rt->dst.flags |= DST_HOST;
1075 rt->rt6i_dst.addr = *daddr;
1076 rt->rt6i_dst.plen = 128;
1077
1078 if (!rt6_is_gw_or_nonexthop(ort)) {
1079 if (ort->rt6i_dst.plen != 128 &&
1080 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
1081 rt->rt6i_flags |= RTF_ANYCAST;
1082#ifdef CONFIG_IPV6_SUBTREES
1083 if (rt->rt6i_src.plen && saddr) {
1084 rt->rt6i_src.addr = *saddr;
1085 rt->rt6i_src.plen = 128;
1086 }
1087#endif
1088 }
1089
1090 return rt;
1091}
1092
1093static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
1094{
1095 struct net_device *dev;
1096 struct rt6_info *pcpu_rt;
1097
1098 rcu_read_lock();
1099 dev = ip6_rt_get_dev_rcu(rt);
1100 pcpu_rt = __ip6_dst_alloc(dev_net(dev), dev, rt->dst.flags);
1101 rcu_read_unlock();
1102 if (!pcpu_rt)
1103 return NULL;
1104 ip6_rt_copy_init(pcpu_rt, rt);
1105 pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
1106 pcpu_rt->rt6i_flags |= RTF_PCPU;
1107 return pcpu_rt;
1108}
1109
1110/* It should be called with rcu_read_lock() acquired */
1111static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
1112{
1113 struct rt6_info *pcpu_rt, **p;
1114
1115 p = this_cpu_ptr(rt->rt6i_pcpu);
1116 pcpu_rt = *p;
1117
1118 if (pcpu_rt && ip6_hold_safe(NULL, &pcpu_rt, false))
1119 rt6_dst_from_metrics_check(pcpu_rt);
1120
1121 return pcpu_rt;
1122}
1123
1124static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
1125{
1126 struct rt6_info *pcpu_rt, *prev, **p;
1127
1128 pcpu_rt = ip6_rt_pcpu_alloc(rt);
1129 if (!pcpu_rt) {
1130 struct net *net = dev_net(rt->dst.dev);
1131
1132 dst_hold(&net->ipv6.ip6_null_entry->dst);
1133 return net->ipv6.ip6_null_entry;
1134 }
1135
1136 dst_hold(&pcpu_rt->dst);
1137 p = this_cpu_ptr(rt->rt6i_pcpu);
1138 prev = cmpxchg(p, NULL, pcpu_rt);
1139 BUG_ON(prev);
1140
1141 rt6_dst_from_metrics_check(pcpu_rt);
1142 return pcpu_rt;
1143}
1144
1145/* exception hash table implementation
1146 */
1147static DEFINE_SPINLOCK(rt6_exception_lock);
1148
1149/* Remove rt6_ex from hash table and free the memory
1150 * Caller must hold rt6_exception_lock
1151 */
1152static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1153 struct rt6_exception *rt6_ex)
1154{
1155 struct net *net;
1156
1157 if (!bucket || !rt6_ex)
1158 return;
1159
1160 net = dev_net(rt6_ex->rt6i->dst.dev);
1161 rt6_ex->rt6i->rt6i_node = NULL;
1162 hlist_del_rcu(&rt6_ex->hlist);
1163 rt6_release(rt6_ex->rt6i);
1164 kfree_rcu(rt6_ex, rcu);
1165 WARN_ON_ONCE(!bucket->depth);
1166 bucket->depth--;
1167 net->ipv6.rt6_stats->fib_rt_cache--;
1168}
1169
1170/* Remove oldest rt6_ex in bucket and free the memory
1171 * Caller must hold rt6_exception_lock
1172 */
1173static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1174{
1175 struct rt6_exception *rt6_ex, *oldest = NULL;
1176
1177 if (!bucket)
1178 return;
1179
1180 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1181 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1182 oldest = rt6_ex;
1183 }
1184 rt6_remove_exception(bucket, oldest);
1185}
1186
1187static u32 rt6_exception_hash(const struct in6_addr *dst,
1188 const struct in6_addr *src)
1189{
1190 static u32 seed __read_mostly;
1191 u32 val;
1192
1193 net_get_random_once(&seed, sizeof(seed));
1194 val = jhash(dst, sizeof(*dst), seed);
1195
1196#ifdef CONFIG_IPV6_SUBTREES
1197 if (src)
1198 val = jhash(src, sizeof(*src), val);
1199#endif
1200 return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
1201}
1202
1203/* Helper function to find the cached rt in the hash table
1204 * and update bucket pointer to point to the bucket for this
1205 * (daddr, saddr) pair
1206 * Caller must hold rt6_exception_lock
1207 */
1208static struct rt6_exception *
1209__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1210 const struct in6_addr *daddr,
1211 const struct in6_addr *saddr)
1212{
1213 struct rt6_exception *rt6_ex;
1214 u32 hval;
1215
1216 if (!(*bucket) || !daddr)
1217 return NULL;
1218
1219 hval = rt6_exception_hash(daddr, saddr);
1220 *bucket += hval;
1221
1222 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1223 struct rt6_info *rt6 = rt6_ex->rt6i;
1224 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1225
1226#ifdef CONFIG_IPV6_SUBTREES
1227 if (matched && saddr)
1228 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1229#endif
1230 if (matched)
1231 return rt6_ex;
1232 }
1233 return NULL;
1234}
1235
1236/* Helper function to find the cached rt in the hash table
1237 * and update bucket pointer to point to the bucket for this
1238 * (daddr, saddr) pair
1239 * Caller must hold rcu_read_lock()
1240 */
1241static struct rt6_exception *
1242__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1243 const struct in6_addr *daddr,
1244 const struct in6_addr *saddr)
1245{
1246 struct rt6_exception *rt6_ex;
1247 u32 hval;
1248
1249 WARN_ON_ONCE(!rcu_read_lock_held());
1250
1251 if (!(*bucket) || !daddr)
1252 return NULL;
1253
1254 hval = rt6_exception_hash(daddr, saddr);
1255 *bucket += hval;
1256
1257 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1258 struct rt6_info *rt6 = rt6_ex->rt6i;
1259 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1260
1261#ifdef CONFIG_IPV6_SUBTREES
1262 if (matched && saddr)
1263 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1264#endif
1265 if (matched)
1266 return rt6_ex;
1267 }
1268 return NULL;
1269}
1270
1271static int rt6_insert_exception(struct rt6_info *nrt,
1272 struct rt6_info *ort)
1273{
1274 struct net *net = dev_net(ort->dst.dev);
1275 struct rt6_exception_bucket *bucket;
1276 struct in6_addr *src_key = NULL;
1277 struct rt6_exception *rt6_ex;
1278 int err = 0;
1279
1280 /* ort can't be a cache or pcpu route */
1281 if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
1282 ort = ort->from;
1283 WARN_ON_ONCE(ort->rt6i_flags & (RTF_CACHE | RTF_PCPU));
1284
1285 spin_lock_bh(&rt6_exception_lock);
1286
1287 if (ort->exception_bucket_flushed) {
1288 err = -EINVAL;
1289 goto out;
1290 }
1291
1292 bucket = rcu_dereference_protected(ort->rt6i_exception_bucket,
1293 lockdep_is_held(&rt6_exception_lock));
1294 if (!bucket) {
1295 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1296 GFP_ATOMIC);
1297 if (!bucket) {
1298 err = -ENOMEM;
1299 goto out;
1300 }
1301 rcu_assign_pointer(ort->rt6i_exception_bucket, bucket);
1302 }
1303
1304#ifdef CONFIG_IPV6_SUBTREES
1305 /* rt6i_src.plen != 0 indicates ort is in subtree
1306 * and exception table is indexed by a hash of
1307 * both rt6i_dst and rt6i_src.
1308 * Otherwise, the exception table is indexed by
1309 * a hash of only rt6i_dst.
1310 */
1311 if (ort->rt6i_src.plen)
1312 src_key = &nrt->rt6i_src.addr;
1313#endif
1314
1315 /* Update rt6i_prefsrc as it could be changed
1316 * in rt6_remove_prefsrc()
1317 */
1318 nrt->rt6i_prefsrc = ort->rt6i_prefsrc;
1319 /* rt6_mtu_change() might lower mtu on ort.
1320 * Only insert this exception route if its mtu
1321 * is less than ort's mtu value.
1322 */
1323 if (nrt->rt6i_pmtu >= dst_mtu(&ort->dst)) {
1324 err = -EINVAL;
1325 goto out;
1326 }
1327
1328 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1329 src_key);
1330 if (rt6_ex)
1331 rt6_remove_exception(bucket, rt6_ex);
1332
1333 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1334 if (!rt6_ex) {
1335 err = -ENOMEM;
1336 goto out;
1337 }
1338 rt6_ex->rt6i = nrt;
1339 rt6_ex->stamp = jiffies;
1340 atomic_inc(&nrt->rt6i_ref);
1341 nrt->rt6i_node = ort->rt6i_node;
1342 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1343 bucket->depth++;
1344 net->ipv6.rt6_stats->fib_rt_cache++;
1345
1346 if (bucket->depth > FIB6_MAX_DEPTH)
1347 rt6_exception_remove_oldest(bucket);
1348
1349out:
1350 spin_unlock_bh(&rt6_exception_lock);
1351
1352 /* Update fn->fn_sernum to invalidate all cached dst */
1353 if (!err) {
1354 spin_lock_bh(&ort->rt6i_table->tb6_lock);
1355 fib6_update_sernum(ort);
1356 spin_unlock_bh(&ort->rt6i_table->tb6_lock);
1357 fib6_force_start_gc(net);
1358 }
1359
1360 return err;
1361}
1362
1363void rt6_flush_exceptions(struct rt6_info *rt)
1364{
1365 struct rt6_exception_bucket *bucket;
1366 struct rt6_exception *rt6_ex;
1367 struct hlist_node *tmp;
1368 int i;
1369
1370 spin_lock_bh(&rt6_exception_lock);
1371 /* Prevent rt6_insert_exception() to recreate the bucket list */
1372 rt->exception_bucket_flushed = 1;
1373
1374 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1375 lockdep_is_held(&rt6_exception_lock));
1376 if (!bucket)
1377 goto out;
1378
1379 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1380 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist)
1381 rt6_remove_exception(bucket, rt6_ex);
1382 WARN_ON_ONCE(bucket->depth);
1383 bucket++;
1384 }
1385
1386out:
1387 spin_unlock_bh(&rt6_exception_lock);
1388}
1389
1390/* Find cached rt in the hash table inside passed in rt
1391 * Caller has to hold rcu_read_lock()
1392 */
1393static struct rt6_info *rt6_find_cached_rt(struct rt6_info *rt,
1394 struct in6_addr *daddr,
1395 struct in6_addr *saddr)
1396{
1397 struct rt6_exception_bucket *bucket;
1398 struct in6_addr *src_key = NULL;
1399 struct rt6_exception *rt6_ex;
1400 struct rt6_info *res = NULL;
1401
1402 bucket = rcu_dereference(rt->rt6i_exception_bucket);
1403
1404#ifdef CONFIG_IPV6_SUBTREES
1405 /* rt6i_src.plen != 0 indicates rt is in subtree
1406 * and exception table is indexed by a hash of
1407 * both rt6i_dst and rt6i_src.
1408 * Otherwise, the exception table is indexed by
1409 * a hash of only rt6i_dst.
1410 */
1411 if (rt->rt6i_src.plen)
1412 src_key = saddr;
1413#endif
1414 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1415
1416 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
1417 res = rt6_ex->rt6i;
1418
1419 return res;
1420}
1421
1422/* Remove the passed in cached rt from the hash table that contains it */
1423int rt6_remove_exception_rt(struct rt6_info *rt)
1424{
1425 struct rt6_exception_bucket *bucket;
1426 struct rt6_info *from = rt->from;
1427 struct in6_addr *src_key = NULL;
1428 struct rt6_exception *rt6_ex;
1429 int err;
1430
1431 if (!from ||
1432 !(rt->rt6i_flags & RTF_CACHE))
1433 return -EINVAL;
1434
1435 if (!rcu_access_pointer(from->rt6i_exception_bucket))
1436 return -ENOENT;
1437
1438 spin_lock_bh(&rt6_exception_lock);
1439 bucket = rcu_dereference_protected(from->rt6i_exception_bucket,
1440 lockdep_is_held(&rt6_exception_lock));
1441#ifdef CONFIG_IPV6_SUBTREES
1442 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1443 * and exception table is indexed by a hash of
1444 * both rt6i_dst and rt6i_src.
1445 * Otherwise, the exception table is indexed by
1446 * a hash of only rt6i_dst.
1447 */
1448 if (from->rt6i_src.plen)
1449 src_key = &rt->rt6i_src.addr;
1450#endif
1451 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1452 &rt->rt6i_dst.addr,
1453 src_key);
1454 if (rt6_ex) {
1455 rt6_remove_exception(bucket, rt6_ex);
1456 err = 0;
1457 } else {
1458 err = -ENOENT;
1459 }
1460
1461 spin_unlock_bh(&rt6_exception_lock);
1462 return err;
1463}
1464
1465/* Find rt6_ex which contains the passed in rt cache and
1466 * refresh its stamp
1467 */
1468static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1469{
1470 struct rt6_exception_bucket *bucket;
1471 struct rt6_info *from = rt->from;
1472 struct in6_addr *src_key = NULL;
1473 struct rt6_exception *rt6_ex;
1474
1475 if (!from ||
1476 !(rt->rt6i_flags & RTF_CACHE))
1477 return;
1478
1479 rcu_read_lock();
1480 bucket = rcu_dereference(from->rt6i_exception_bucket);
1481
1482#ifdef CONFIG_IPV6_SUBTREES
1483 /* rt6i_src.plen != 0 indicates 'from' is in subtree
1484 * and exception table is indexed by a hash of
1485 * both rt6i_dst and rt6i_src.
1486 * Otherwise, the exception table is indexed by
1487 * a hash of only rt6i_dst.
1488 */
1489 if (from->rt6i_src.plen)
1490 src_key = &rt->rt6i_src.addr;
1491#endif
1492 rt6_ex = __rt6_find_exception_rcu(&bucket,
1493 &rt->rt6i_dst.addr,
1494 src_key);
1495 if (rt6_ex)
1496 rt6_ex->stamp = jiffies;
1497
1498 rcu_read_unlock();
1499}
1500
1501static void rt6_exceptions_remove_prefsrc(struct rt6_info *rt)
1502{
1503 struct rt6_exception_bucket *bucket;
1504 struct rt6_exception *rt6_ex;
1505 int i;
1506
1507 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1508 lockdep_is_held(&rt6_exception_lock));
1509
1510 if (bucket) {
1511 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1512 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1513 rt6_ex->rt6i->rt6i_prefsrc.plen = 0;
1514 }
1515 bucket++;
1516 }
1517 }
1518}
1519
1520static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1521 struct rt6_info *rt, int mtu)
1522{
1523 /* If the new MTU is lower than the route PMTU, this new MTU will be the
1524 * lowest MTU in the path: always allow updating the route PMTU to
1525 * reflect PMTU decreases.
1526 *
1527 * If the new MTU is higher, and the route PMTU is equal to the local
1528 * MTU, this means the old MTU is the lowest in the path, so allow
1529 * updating it: if other nodes now have lower MTUs, PMTU discovery will
1530 * handle this.
1531 */
1532
1533 if (dst_mtu(&rt->dst) >= mtu)
1534 return true;
1535
1536 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
1537 return true;
1538
1539 return false;
1540}
1541
1542static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
1543 struct rt6_info *rt, int mtu)
1544{
1545 struct rt6_exception_bucket *bucket;
1546 struct rt6_exception *rt6_ex;
1547 int i;
1548
1549 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1550 lockdep_is_held(&rt6_exception_lock));
1551
1552 if (!bucket)
1553 return;
1554
1555 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1556 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1557 struct rt6_info *entry = rt6_ex->rt6i;
1558
1559 /* For RTF_CACHE with rt6i_pmtu == 0 (i.e. a redirected
1560 * route), the metrics of its rt->dst.from have already
1561 * been updated.
1562 */
1563 if (entry->rt6i_pmtu &&
1564 rt6_mtu_change_route_allowed(idev, entry, mtu))
1565 entry->rt6i_pmtu = mtu;
1566 }
1567 bucket++;
1568 }
1569}
1570
1571#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
1572
1573static void rt6_exceptions_clean_tohost(struct rt6_info *rt,
1574 struct in6_addr *gateway)
1575{
1576 struct rt6_exception_bucket *bucket;
1577 struct rt6_exception *rt6_ex;
1578 struct hlist_node *tmp;
1579 int i;
1580
1581 if (!rcu_access_pointer(rt->rt6i_exception_bucket))
1582 return;
1583
1584 spin_lock_bh(&rt6_exception_lock);
1585 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1586 lockdep_is_held(&rt6_exception_lock));
1587
1588 if (bucket) {
1589 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1590 hlist_for_each_entry_safe(rt6_ex, tmp,
1591 &bucket->chain, hlist) {
1592 struct rt6_info *entry = rt6_ex->rt6i;
1593
1594 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
1595 RTF_CACHE_GATEWAY &&
1596 ipv6_addr_equal(gateway,
1597 &entry->rt6i_gateway)) {
1598 rt6_remove_exception(bucket, rt6_ex);
1599 }
1600 }
1601 bucket++;
1602 }
1603 }
1604
1605 spin_unlock_bh(&rt6_exception_lock);
1606}
1607
1608static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
1609 struct rt6_exception *rt6_ex,
1610 struct fib6_gc_args *gc_args,
1611 unsigned long now)
1612{
1613 struct rt6_info *rt = rt6_ex->rt6i;
1614
1615 /* we are pruning and obsoleting aged-out and non gateway exceptions
1616 * even if others have still references to them, so that on next
1617 * dst_check() such references can be dropped.
1618 * EXPIRES exceptions - e.g. pmtu-generated ones are pruned when
1619 * expired, independently from their aging, as per RFC 8201 section 4
1620 */
1621 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1622 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
1623 RT6_TRACE("aging clone %p\n", rt);
1624 rt6_remove_exception(bucket, rt6_ex);
1625 return;
1626 }
1627 } else if (time_after(jiffies, rt->dst.expires)) {
1628 RT6_TRACE("purging expired route %p\n", rt);
1629 rt6_remove_exception(bucket, rt6_ex);
1630 return;
1631 }
1632
1633 if (rt->rt6i_flags & RTF_GATEWAY) {
1634 struct neighbour *neigh;
1635 __u8 neigh_flags = 0;
1636
1637 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
1638 if (neigh)
1639 neigh_flags = neigh->flags;
1640
1641 if (!(neigh_flags & NTF_ROUTER)) {
1642 RT6_TRACE("purging route %p via non-router but gateway\n",
1643 rt);
1644 rt6_remove_exception(bucket, rt6_ex);
1645 return;
1646 }
1647 }
1648
1649 gc_args->more++;
1650}
1651
1652void rt6_age_exceptions(struct rt6_info *rt,
1653 struct fib6_gc_args *gc_args,
1654 unsigned long now)
1655{
1656 struct rt6_exception_bucket *bucket;
1657 struct rt6_exception *rt6_ex;
1658 struct hlist_node *tmp;
1659 int i;
1660
1661 if (!rcu_access_pointer(rt->rt6i_exception_bucket))
1662 return;
1663
1664 rcu_read_lock_bh();
1665 spin_lock(&rt6_exception_lock);
1666 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1667 lockdep_is_held(&rt6_exception_lock));
1668
1669 if (bucket) {
1670 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1671 hlist_for_each_entry_safe(rt6_ex, tmp,
1672 &bucket->chain, hlist) {
1673 rt6_age_examine_exception(bucket, rt6_ex,
1674 gc_args, now);
1675 }
1676 bucket++;
1677 }
1678 }
1679 spin_unlock(&rt6_exception_lock);
1680 rcu_read_unlock_bh();
1681}
1682
1683struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1684 int oif, struct flowi6 *fl6,
1685 const struct sk_buff *skb, int flags)
1686{
1687 struct fib6_node *fn, *saved_fn;
1688 struct rt6_info *rt, *rt_cache;
1689 int strict = 0;
1690
1691 strict |= flags & RT6_LOOKUP_F_IFACE;
1692 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
1693 if (net->ipv6.devconf_all->forwarding == 0)
1694 strict |= RT6_LOOKUP_F_REACHABLE;
1695
1696 rcu_read_lock();
1697
1698 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1699 saved_fn = fn;
1700
1701 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1702 oif = 0;
1703
1704redo_rt6_select:
1705 rt = rt6_select(net, fn, oif, strict);
1706 if (rt->rt6i_nsiblings)
1707 rt = rt6_multipath_select(net, rt, fl6, oif, skb, strict);
1708 if (rt == net->ipv6.ip6_null_entry) {
1709 fn = fib6_backtrack(fn, &fl6->saddr);
1710 if (fn)
1711 goto redo_rt6_select;
1712 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1713 /* also consider unreachable route */
1714 strict &= ~RT6_LOOKUP_F_REACHABLE;
1715 fn = saved_fn;
1716 goto redo_rt6_select;
1717 }
1718 }
1719
1720 /*Search through exception table */
1721 rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr);
1722 if (rt_cache)
1723 rt = rt_cache;
1724
1725 if (rt == net->ipv6.ip6_null_entry) {
1726 rcu_read_unlock();
1727 dst_hold(&rt->dst);
1728 trace_fib6_table_lookup(net, rt, table, fl6);
1729 return rt;
1730 } else if (rt->rt6i_flags & RTF_CACHE) {
1731 if (ip6_hold_safe(net, &rt, true)) {
1732 dst_use_noref(&rt->dst, jiffies);
1733 rt6_dst_from_metrics_check(rt);
1734 }
1735 rcu_read_unlock();
1736 trace_fib6_table_lookup(net, rt, table, fl6);
1737 return rt;
1738 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1739 !(rt->rt6i_flags & RTF_GATEWAY))) {
1740 /* Create a RTF_CACHE clone which will not be
1741 * owned by the fib6 tree. It is for the special case where
1742 * the daddr in the skb during the neighbor look-up is different
1743 * from the fl6->daddr used to look-up route here.
1744 */
1745
1746 struct rt6_info *uncached_rt;
1747
1748 if (ip6_hold_safe(net, &rt, true)) {
1749 dst_use_noref(&rt->dst, jiffies);
1750 } else {
1751 rcu_read_unlock();
1752 uncached_rt = rt;
1753 goto uncached_rt_out;
1754 }
1755 rcu_read_unlock();
1756
1757 uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
1758 dst_release(&rt->dst);
1759
1760 if (uncached_rt) {
1761 /* Uncached_rt's refcnt is taken during ip6_rt_cache_alloc()
1762 * No need for another dst_hold()
1763 */
1764 rt6_uncached_list_add(uncached_rt);
1765 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
1766 } else {
1767 uncached_rt = net->ipv6.ip6_null_entry;
1768 dst_hold(&uncached_rt->dst);
1769 }
1770
1771uncached_rt_out:
1772 trace_fib6_table_lookup(net, uncached_rt, table, fl6);
1773 return uncached_rt;
1774
1775 } else {
1776 /* Get a percpu copy */
1777
1778 struct rt6_info *pcpu_rt;
1779
1780 dst_use_noref(&rt->dst, jiffies);
1781 local_bh_disable();
1782 pcpu_rt = rt6_get_pcpu_route(rt);
1783
1784 if (!pcpu_rt) {
1785 /* atomic_inc_not_zero() is needed when using rcu */
1786 if (atomic_inc_not_zero(&rt->rt6i_ref)) {
1787 /* No dst_hold() on rt is needed because grabbing
1788 * rt->rt6i_ref makes sure rt can't be released.
1789 */
1790 pcpu_rt = rt6_make_pcpu_route(rt);
1791 rt6_release(rt);
1792 } else {
1793 /* rt is already removed from tree */
1794 pcpu_rt = net->ipv6.ip6_null_entry;
1795 dst_hold(&pcpu_rt->dst);
1796 }
1797 }
1798 local_bh_enable();
1799 rcu_read_unlock();
1800 trace_fib6_table_lookup(net, pcpu_rt, table, fl6);
1801 return pcpu_rt;
1802 }
1803}
1804EXPORT_SYMBOL_GPL(ip6_pol_route);
1805
1806static struct rt6_info *ip6_pol_route_input(struct net *net,
1807 struct fib6_table *table,
1808 struct flowi6 *fl6,
1809 const struct sk_buff *skb,
1810 int flags)
1811{
1812 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
1813}
1814
1815struct dst_entry *ip6_route_input_lookup(struct net *net,
1816 struct net_device *dev,
1817 struct flowi6 *fl6,
1818 const struct sk_buff *skb,
1819 int flags)
1820{
1821 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1822 flags |= RT6_LOOKUP_F_IFACE;
1823
1824 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
1825}
1826EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
1827
1828static void ip6_multipath_l3_keys(const struct sk_buff *skb,
1829 struct flow_keys *keys,
1830 struct flow_keys *flkeys)
1831{
1832 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
1833 const struct ipv6hdr *key_iph = outer_iph;
1834 struct flow_keys *_flkeys = flkeys;
1835 const struct ipv6hdr *inner_iph;
1836 const struct icmp6hdr *icmph;
1837 struct ipv6hdr _inner_iph;
1838 struct icmp6hdr _icmph;
1839
1840 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
1841 goto out;
1842
1843 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
1844 sizeof(_icmph), &_icmph);
1845 if (!icmph)
1846 goto out;
1847
1848 if (icmph->icmp6_type != ICMPV6_DEST_UNREACH &&
1849 icmph->icmp6_type != ICMPV6_PKT_TOOBIG &&
1850 icmph->icmp6_type != ICMPV6_TIME_EXCEED &&
1851 icmph->icmp6_type != ICMPV6_PARAMPROB)
1852 goto out;
1853
1854 inner_iph = skb_header_pointer(skb,
1855 skb_transport_offset(skb) + sizeof(*icmph),
1856 sizeof(_inner_iph), &_inner_iph);
1857 if (!inner_iph)
1858 goto out;
1859
1860 key_iph = inner_iph;
1861 _flkeys = NULL;
1862out:
1863 if (_flkeys) {
1864 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
1865 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
1866 keys->tags.flow_label = _flkeys->tags.flow_label;
1867 keys->basic.ip_proto = _flkeys->basic.ip_proto;
1868 } else {
1869 keys->addrs.v6addrs.src = key_iph->saddr;
1870 keys->addrs.v6addrs.dst = key_iph->daddr;
1871 keys->tags.flow_label = ip6_flowinfo(key_iph);
1872 keys->basic.ip_proto = key_iph->nexthdr;
1873 }
1874}
1875
1876/* if skb is set it will be used and fl6 can be NULL */
1877u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
1878 const struct sk_buff *skb, struct flow_keys *flkeys)
1879{
1880 struct flow_keys hash_keys;
1881 u32 mhash;
1882
1883 switch (ip6_multipath_hash_policy(net)) {
1884 case 0:
1885 memset(&hash_keys, 0, sizeof(hash_keys));
1886 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1887 if (skb) {
1888 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
1889 } else {
1890 hash_keys.addrs.v6addrs.src = fl6->saddr;
1891 hash_keys.addrs.v6addrs.dst = fl6->daddr;
1892 hash_keys.tags.flow_label = (__force u32)fl6->flowlabel;
1893 hash_keys.basic.ip_proto = fl6->flowi6_proto;
1894 }
1895 break;
1896 case 1:
1897 if (skb) {
1898 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
1899 struct flow_keys keys;
1900
1901 /* short-circuit if we already have L4 hash present */
1902 if (skb->l4_hash)
1903 return skb_get_hash_raw(skb) >> 1;
1904
1905 memset(&hash_keys, 0, sizeof(hash_keys));
1906
1907 if (!flkeys) {
1908 skb_flow_dissect_flow_keys(skb, &keys, flag);
1909 flkeys = &keys;
1910 }
1911 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1912 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
1913 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
1914 hash_keys.ports.src = flkeys->ports.src;
1915 hash_keys.ports.dst = flkeys->ports.dst;
1916 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
1917 } else {
1918 memset(&hash_keys, 0, sizeof(hash_keys));
1919 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
1920 hash_keys.addrs.v6addrs.src = fl6->saddr;
1921 hash_keys.addrs.v6addrs.dst = fl6->daddr;
1922 hash_keys.ports.src = fl6->fl6_sport;
1923 hash_keys.ports.dst = fl6->fl6_dport;
1924 hash_keys.basic.ip_proto = fl6->flowi6_proto;
1925 }
1926 break;
1927 }
1928 mhash = flow_hash_from_keys(&hash_keys);
1929
1930 return mhash >> 1;
1931}
1932
1933void ip6_route_input(struct sk_buff *skb)
1934{
1935 const struct ipv6hdr *iph = ipv6_hdr(skb);
1936 struct net *net = dev_net(skb->dev);
1937 int flags = RT6_LOOKUP_F_HAS_SADDR;
1938 struct ip_tunnel_info *tun_info;
1939 struct flowi6 fl6 = {
1940 .flowi6_iif = skb->dev->ifindex,
1941 .daddr = iph->daddr,
1942 .saddr = iph->saddr,
1943 .flowlabel = ip6_flowinfo(iph),
1944 .flowi6_mark = skb->mark,
1945 .flowi6_proto = iph->nexthdr,
1946 };
1947 struct flow_keys *flkeys = NULL, _flkeys;
1948
1949 tun_info = skb_tunnel_info(skb);
1950 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
1951 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
1952
1953 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
1954 flkeys = &_flkeys;
1955
1956 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
1957 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
1958 skb_dst_drop(skb);
1959 skb_dst_set(skb,
1960 ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags));
1961}
1962
1963static struct rt6_info *ip6_pol_route_output(struct net *net,
1964 struct fib6_table *table,
1965 struct flowi6 *fl6,
1966 const struct sk_buff *skb,
1967 int flags)
1968{
1969 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
1970}
1971
1972struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
1973 struct flowi6 *fl6, int flags)
1974{
1975 bool any_src;
1976
1977 if (rt6_need_strict(&fl6->daddr)) {
1978 struct dst_entry *dst;
1979
1980 dst = l3mdev_link_scope_lookup(net, fl6);
1981 if (dst)
1982 return dst;
1983 }
1984
1985 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1986
1987 any_src = ipv6_addr_any(&fl6->saddr);
1988 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
1989 (fl6->flowi6_oif && any_src))
1990 flags |= RT6_LOOKUP_F_IFACE;
1991
1992 if (!any_src)
1993 flags |= RT6_LOOKUP_F_HAS_SADDR;
1994 else if (sk)
1995 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1996
1997 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
1998}
1999EXPORT_SYMBOL_GPL(ip6_route_output_flags);
2000
2001struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
2002{
2003 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
2004 struct net_device *loopback_dev = net->loopback_dev;
2005 struct dst_entry *new = NULL;
2006
2007 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
2008 DST_OBSOLETE_DEAD, 0);
2009 if (rt) {
2010 rt6_info_init(rt);
2011 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
2012
2013 new = &rt->dst;
2014 new->__use = 1;
2015 new->input = dst_discard;
2016 new->output = dst_discard_out;
2017
2018 dst_copy_metrics(new, &ort->dst);
2019
2020 rt->rt6i_idev = in6_dev_get(loopback_dev);
2021 rt->rt6i_gateway = ort->rt6i_gateway;
2022 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
2023 rt->rt6i_metric = 0;
2024
2025 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2026#ifdef CONFIG_IPV6_SUBTREES
2027 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2028#endif
2029 }
2030
2031 dst_release(dst_orig);
2032 return new ? new : ERR_PTR(-ENOMEM);
2033}
2034
2035/*
2036 * Destination cache support functions
2037 */
2038
2039static void rt6_dst_from_metrics_check(struct rt6_info *rt)
2040{
2041 if (rt->from &&
2042 dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(&rt->from->dst))
2043 dst_init_metrics(&rt->dst, dst_metrics_ptr(&rt->from->dst), true);
2044}
2045
2046static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
2047{
2048 u32 rt_cookie = 0;
2049
2050 if (!rt6_get_cookie_safe(rt, &rt_cookie) || rt_cookie != cookie)
2051 return NULL;
2052
2053 if (rt6_check_expired(rt))
2054 return NULL;
2055
2056 return &rt->dst;
2057}
2058
2059static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
2060{
2061 if (!__rt6_check_expired(rt) &&
2062 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
2063 rt6_check(rt->from, cookie))
2064 return &rt->dst;
2065 else
2066 return NULL;
2067}
2068
2069static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
2070{
2071 struct rt6_info *rt;
2072
2073 rt = (struct rt6_info *) dst;
2074
2075 /* All IPV6 dsts are created with ->obsolete set to the value
2076 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
2077 * into this function always.
2078 */
2079
2080 rt6_dst_from_metrics_check(rt);
2081
2082 if (rt->rt6i_flags & RTF_PCPU ||
2083 (unlikely(!list_empty(&rt->rt6i_uncached)) && rt->from))
2084 return rt6_dst_from_check(rt, cookie);
2085 else
2086 return rt6_check(rt, cookie);
2087}
2088
2089static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2090{
2091 struct rt6_info *rt = (struct rt6_info *) dst;
2092
2093 if (rt) {
2094 if (rt->rt6i_flags & RTF_CACHE) {
2095 if (rt6_check_expired(rt)) {
2096 ip6_del_rt(rt);
2097 dst = NULL;
2098 }
2099 } else {
2100 dst_release(dst);
2101 dst = NULL;
2102 }
2103 }
2104 return dst;
2105}
2106
2107static void ip6_link_failure(struct sk_buff *skb)
2108{
2109 struct rt6_info *rt;
2110
2111 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
2112
2113 rt = (struct rt6_info *) skb_dst(skb);
2114 if (rt) {
2115 if (rt->rt6i_flags & RTF_CACHE) {
2116 if (dst_hold_safe(&rt->dst))
2117 ip6_del_rt(rt);
2118 } else {
2119 struct fib6_node *fn;
2120
2121 rcu_read_lock();
2122 fn = rcu_dereference(rt->rt6i_node);
2123 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2124 fn->fn_sernum = -1;
2125 rcu_read_unlock();
2126 }
2127 }
2128}
2129
2130static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2131{
2132 struct net *net = dev_net(rt->dst.dev);
2133
2134 rt->rt6i_flags |= RTF_MODIFIED;
2135 rt->rt6i_pmtu = mtu;
2136 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2137}
2138
2139static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2140{
2141 return !(rt->rt6i_flags & RTF_CACHE) &&
2142 (rt->rt6i_flags & RTF_PCPU ||
2143 rcu_access_pointer(rt->rt6i_node));
2144}
2145
2146static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
2147 const struct ipv6hdr *iph, u32 mtu)
2148{
2149 const struct in6_addr *daddr, *saddr;
2150 struct rt6_info *rt6 = (struct rt6_info *)dst;
2151
2152 if (rt6->rt6i_flags & RTF_LOCAL)
2153 return;
2154
2155 if (dst_metric_locked(dst, RTAX_MTU))
2156 return;
2157
2158 if (iph) {
2159 daddr = &iph->daddr;
2160 saddr = &iph->saddr;
2161 } else if (sk) {
2162 daddr = &sk->sk_v6_daddr;
2163 saddr = &inet6_sk(sk)->saddr;
2164 } else {
2165 daddr = NULL;
2166 saddr = NULL;
2167 }
2168 dst_confirm_neigh(dst, daddr);
2169 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
2170 if (mtu >= dst_mtu(dst))
2171 return;
2172
2173 if (!rt6_cache_allowed_for_pmtu(rt6)) {
2174 rt6_do_update_pmtu(rt6, mtu);
2175 /* update rt6_ex->stamp for cache */
2176 if (rt6->rt6i_flags & RTF_CACHE)
2177 rt6_update_exception_stamp_rt(rt6);
2178 } else if (daddr) {
2179 struct rt6_info *nrt6;
2180
2181 nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
2182 if (nrt6) {
2183 rt6_do_update_pmtu(nrt6, mtu);
2184 if (rt6_insert_exception(nrt6, rt6))
2185 dst_release_immediate(&nrt6->dst);
2186 }
2187 }
2188}
2189
2190static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
2191 struct sk_buff *skb, u32 mtu)
2192{
2193 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
2194}
2195
2196void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
2197 int oif, u32 mark, kuid_t uid)
2198{
2199 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2200 struct dst_entry *dst;
2201 struct flowi6 fl6;
2202
2203 memset(&fl6, 0, sizeof(fl6));
2204 fl6.flowi6_oif = oif;
2205 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
2206 fl6.daddr = iph->daddr;
2207 fl6.saddr = iph->saddr;
2208 fl6.flowlabel = ip6_flowinfo(iph);
2209 fl6.flowi6_uid = uid;
2210
2211 dst = ip6_route_output(net, NULL, &fl6);
2212 if (!dst->error)
2213 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
2214 dst_release(dst);
2215}
2216EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2217
2218void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2219{
2220 struct dst_entry *dst;
2221
2222 ip6_update_pmtu(skb, sock_net(sk), mtu,
2223 sk->sk_bound_dev_if, sk->sk_mark, sk->sk_uid);
2224
2225 dst = __sk_dst_get(sk);
2226 if (!dst || !dst->obsolete ||
2227 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2228 return;
2229
2230 bh_lock_sock(sk);
2231 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2232 ip6_datagram_dst_update(sk, false);
2233 bh_unlock_sock(sk);
2234}
2235EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2236
2237void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2238 const struct flowi6 *fl6)
2239{
2240#ifdef CONFIG_IPV6_SUBTREES
2241 struct ipv6_pinfo *np = inet6_sk(sk);
2242#endif
2243
2244 ip6_dst_store(sk, dst,
2245 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2246 &sk->sk_v6_daddr : NULL,
2247#ifdef CONFIG_IPV6_SUBTREES
2248 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2249 &np->saddr :
2250#endif
2251 NULL);
2252}
2253
2254/* Handle redirects */
2255struct ip6rd_flowi {
2256 struct flowi6 fl6;
2257 struct in6_addr gateway;
2258};
2259
2260static struct rt6_info *__ip6_route_redirect(struct net *net,
2261 struct fib6_table *table,
2262 struct flowi6 *fl6,
2263 const struct sk_buff *skb,
2264 int flags)
2265{
2266 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
2267 struct rt6_info *rt, *rt_cache;
2268 struct fib6_node *fn;
2269
2270 /* Get the "current" route for this destination and
2271 * check if the redirect has come from appropriate router.
2272 *
2273 * RFC 4861 specifies that redirects should only be
2274 * accepted if they come from the nexthop to the target.
2275 * Due to the way the routes are chosen, this notion
2276 * is a bit fuzzy and one might need to check all possible
2277 * routes.
2278 */
2279
2280 rcu_read_lock();
2281 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
2282restart:
2283 for_each_fib6_node_rt_rcu(fn) {
2284 if (rt->rt6i_nh_flags & RTNH_F_DEAD)
2285 continue;
2286 if (rt6_check_expired(rt))
2287 continue;
2288 if (rt->dst.error)
2289 break;
2290 if (!(rt->rt6i_flags & RTF_GATEWAY))
2291 continue;
2292 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
2293 continue;
2294 /* rt_cache's gateway might be different from its 'parent'
2295 * in the case of an ip redirect.
2296 * So we keep searching in the exception table if the gateway
2297 * is different.
2298 */
2299 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) {
2300 rt_cache = rt6_find_cached_rt(rt,
2301 &fl6->daddr,
2302 &fl6->saddr);
2303 if (rt_cache &&
2304 ipv6_addr_equal(&rdfl->gateway,
2305 &rt_cache->rt6i_gateway)) {
2306 rt = rt_cache;
2307 break;
2308 }
2309 continue;
2310 }
2311 break;
2312 }
2313
2314 if (!rt)
2315 rt = net->ipv6.ip6_null_entry;
2316 else if (rt->dst.error) {
2317 rt = net->ipv6.ip6_null_entry;
2318 goto out;
2319 }
2320
2321 if (rt == net->ipv6.ip6_null_entry) {
2322 fn = fib6_backtrack(fn, &fl6->saddr);
2323 if (fn)
2324 goto restart;
2325 }
2326
2327out:
2328 ip6_hold_safe(net, &rt, true);
2329
2330 rcu_read_unlock();
2331
2332 trace_fib6_table_lookup(net, rt, table, fl6);
2333 return rt;
2334};
2335
2336static struct dst_entry *ip6_route_redirect(struct net *net,
2337 const struct flowi6 *fl6,
2338 const struct sk_buff *skb,
2339 const struct in6_addr *gateway)
2340{
2341 int flags = RT6_LOOKUP_F_HAS_SADDR;
2342 struct ip6rd_flowi rdfl;
2343
2344 rdfl.fl6 = *fl6;
2345 rdfl.gateway = *gateway;
2346
2347 return fib6_rule_lookup(net, &rdfl.fl6, skb,
2348 flags, __ip6_route_redirect);
2349}
2350
2351void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
2352 kuid_t uid)
2353{
2354 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2355 struct dst_entry *dst;
2356 struct flowi6 fl6;
2357
2358 memset(&fl6, 0, sizeof(fl6));
2359 fl6.flowi6_iif = LOOPBACK_IFINDEX;
2360 fl6.flowi6_oif = oif;
2361 fl6.flowi6_mark = mark;
2362 fl6.daddr = iph->daddr;
2363 fl6.saddr = iph->saddr;
2364 fl6.flowlabel = ip6_flowinfo(iph);
2365 fl6.flowi6_uid = uid;
2366
2367 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
2368 rt6_do_redirect(dst, NULL, skb);
2369 dst_release(dst);
2370}
2371EXPORT_SYMBOL_GPL(ip6_redirect);
2372
2373void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
2374 u32 mark)
2375{
2376 const struct ipv6hdr *iph = ipv6_hdr(skb);
2377 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
2378 struct dst_entry *dst;
2379 struct flowi6 fl6;
2380
2381 memset(&fl6, 0, sizeof(fl6));
2382 fl6.flowi6_iif = LOOPBACK_IFINDEX;
2383 fl6.flowi6_oif = oif;
2384 fl6.flowi6_mark = mark;
2385 fl6.daddr = msg->dest;
2386 fl6.saddr = iph->daddr;
2387 fl6.flowi6_uid = sock_net_uid(net, NULL);
2388
2389 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
2390 rt6_do_redirect(dst, NULL, skb);
2391 dst_release(dst);
2392}
2393
2394void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
2395{
2396 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
2397 sk->sk_uid);
2398}
2399EXPORT_SYMBOL_GPL(ip6_sk_redirect);
2400
2401static unsigned int ip6_default_advmss(const struct dst_entry *dst)
2402{
2403 struct net_device *dev = dst->dev;
2404 unsigned int mtu = dst_mtu(dst);
2405 struct net *net = dev_net(dev);
2406
2407 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
2408
2409 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
2410 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
2411
2412 /*
2413 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
2414 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
2415 * IPV6_MAXPLEN is also valid and means: "any MSS,
2416 * rely only on pmtu discovery"
2417 */
2418 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
2419 mtu = IPV6_MAXPLEN;
2420 return mtu;
2421}
2422
2423static unsigned int ip6_mtu(const struct dst_entry *dst)
2424{
2425 const struct rt6_info *rt = (const struct rt6_info *)dst;
2426 unsigned int mtu = rt->rt6i_pmtu;
2427 struct inet6_dev *idev;
2428
2429 if (mtu)
2430 goto out;
2431
2432 mtu = dst_metric_raw(dst, RTAX_MTU);
2433 if (mtu)
2434 goto out;
2435
2436 mtu = IPV6_MIN_MTU;
2437
2438 rcu_read_lock();
2439 idev = __in6_dev_get(dst->dev);
2440 if (idev)
2441 mtu = idev->cnf.mtu6;
2442 rcu_read_unlock();
2443
2444out:
2445 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
2446
2447 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
2448}
2449
2450struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
2451 struct flowi6 *fl6)
2452{
2453 struct dst_entry *dst;
2454 struct rt6_info *rt;
2455 struct inet6_dev *idev = in6_dev_get(dev);
2456 struct net *net = dev_net(dev);
2457
2458 if (unlikely(!idev))
2459 return ERR_PTR(-ENODEV);
2460
2461 rt = ip6_dst_alloc(net, dev, 0);
2462 if (unlikely(!rt)) {
2463 in6_dev_put(idev);
2464 dst = ERR_PTR(-ENOMEM);
2465 goto out;
2466 }
2467
2468 rt->dst.flags |= DST_HOST;
2469 rt->dst.input = ip6_input;
2470 rt->dst.output = ip6_output;
2471 rt->rt6i_gateway = fl6->daddr;
2472 rt->rt6i_dst.addr = fl6->daddr;
2473 rt->rt6i_dst.plen = 128;
2474 rt->rt6i_idev = idev;
2475 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
2476
2477 /* Add this dst into uncached_list so that rt6_disable_ip() can
2478 * do proper release of the net_device
2479 */
2480 rt6_uncached_list_add(rt);
2481 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
2482
2483 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
2484
2485out:
2486 return dst;
2487}
2488
2489static int ip6_dst_gc(struct dst_ops *ops)
2490{
2491 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
2492 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
2493 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
2494 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
2495 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
2496 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
2497 int entries;
2498
2499 entries = dst_entries_get_fast(ops);
2500 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
2501 entries <= rt_max_size)
2502 goto out;
2503
2504 net->ipv6.ip6_rt_gc_expire++;
2505 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
2506 entries = dst_entries_get_slow(ops);
2507 if (entries < ops->gc_thresh)
2508 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
2509out:
2510 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
2511 return entries > rt_max_size;
2512}
2513
2514static int ip6_convert_metrics(struct mx6_config *mxc,
2515 const struct fib6_config *cfg)
2516{
2517 struct net *net = cfg->fc_nlinfo.nl_net;
2518 bool ecn_ca = false;
2519 struct nlattr *nla;
2520 int remaining;
2521 u32 *mp;
2522
2523 if (!cfg->fc_mx)
2524 return 0;
2525
2526 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
2527 if (unlikely(!mp))
2528 return -ENOMEM;
2529
2530 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
2531 int type = nla_type(nla);
2532 u32 val;
2533
2534 if (!type)
2535 continue;
2536 if (unlikely(type > RTAX_MAX))
2537 goto err;
2538
2539 if (type == RTAX_CC_ALGO) {
2540 char tmp[TCP_CA_NAME_MAX];
2541
2542 nla_strlcpy(tmp, nla, sizeof(tmp));
2543 val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
2544 if (val == TCP_CA_UNSPEC)
2545 goto err;
2546 } else {
2547 val = nla_get_u32(nla);
2548 }
2549 if (type == RTAX_HOPLIMIT && val > 255)
2550 val = 255;
2551 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
2552 goto err;
2553
2554 mp[type - 1] = val;
2555 __set_bit(type - 1, mxc->mx_valid);
2556 }
2557
2558 if (ecn_ca) {
2559 __set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
2560 mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
2561 }
2562
2563 mxc->mx = mp;
2564 return 0;
2565 err:
2566 kfree(mp);
2567 return -EINVAL;
2568}
2569
2570static struct rt6_info *ip6_nh_lookup_table(struct net *net,
2571 struct fib6_config *cfg,
2572 const struct in6_addr *gw_addr,
2573 u32 tbid, int flags)
2574{
2575 struct flowi6 fl6 = {
2576 .flowi6_oif = cfg->fc_ifindex,
2577 .daddr = *gw_addr,
2578 .saddr = cfg->fc_prefsrc,
2579 };
2580 struct fib6_table *table;
2581 struct rt6_info *rt;
2582
2583 table = fib6_get_table(net, tbid);
2584 if (!table)
2585 return NULL;
2586
2587 if (!ipv6_addr_any(&cfg->fc_prefsrc))
2588 flags |= RT6_LOOKUP_F_HAS_SADDR;
2589
2590 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
2591 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, NULL, flags);
2592
2593 /* if table lookup failed, fall back to full lookup */
2594 if (rt == net->ipv6.ip6_null_entry) {
2595 ip6_rt_put(rt);
2596 rt = NULL;
2597 }
2598
2599 return rt;
2600}
2601
2602static int ip6_route_check_nh_onlink(struct net *net,
2603 struct fib6_config *cfg,
2604 const struct net_device *dev,
2605 struct netlink_ext_ack *extack)
2606{
2607 u32 tbid = l3mdev_fib_table(dev) ? : RT_TABLE_MAIN;
2608 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2609 u32 flags = RTF_LOCAL | RTF_ANYCAST | RTF_REJECT;
2610 struct rt6_info *grt;
2611 int err;
2612
2613 err = 0;
2614 grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0);
2615 if (grt) {
2616 if (!grt->dst.error &&
2617 (grt->rt6i_flags & flags || dev != grt->dst.dev)) {
2618 NL_SET_ERR_MSG(extack,
2619 "Nexthop has invalid gateway or device mismatch");
2620 err = -EINVAL;
2621 }
2622
2623 ip6_rt_put(grt);
2624 }
2625
2626 return err;
2627}
2628
2629static int ip6_route_check_nh(struct net *net,
2630 struct fib6_config *cfg,
2631 struct net_device **_dev,
2632 struct inet6_dev **idev)
2633{
2634 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2635 struct net_device *dev = _dev ? *_dev : NULL;
2636 struct rt6_info *grt = NULL;
2637 int err = -EHOSTUNREACH;
2638
2639 if (cfg->fc_table) {
2640 int flags = RT6_LOOKUP_F_IFACE;
2641
2642 grt = ip6_nh_lookup_table(net, cfg, gw_addr,
2643 cfg->fc_table, flags);
2644 if (grt) {
2645 if (grt->rt6i_flags & RTF_GATEWAY ||
2646 (dev && dev != grt->dst.dev)) {
2647 ip6_rt_put(grt);
2648 grt = NULL;
2649 }
2650 }
2651 }
2652
2653 if (!grt)
2654 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, NULL, 1);
2655
2656 if (!grt)
2657 goto out;
2658
2659 if (dev) {
2660 if (dev != grt->dst.dev) {
2661 ip6_rt_put(grt);
2662 goto out;
2663 }
2664 } else {
2665 *_dev = dev = grt->dst.dev;
2666 *idev = grt->rt6i_idev;
2667 dev_hold(dev);
2668 in6_dev_hold(grt->rt6i_idev);
2669 }
2670
2671 if (!(grt->rt6i_flags & RTF_GATEWAY))
2672 err = 0;
2673
2674 ip6_rt_put(grt);
2675
2676out:
2677 return err;
2678}
2679
2680static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
2681 struct net_device **_dev, struct inet6_dev **idev,
2682 struct netlink_ext_ack *extack)
2683{
2684 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2685 int gwa_type = ipv6_addr_type(gw_addr);
2686 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
2687 const struct net_device *dev = *_dev;
2688 bool need_addr_check = !dev;
2689 int err = -EINVAL;
2690
2691 /* if gw_addr is local we will fail to detect this in case
2692 * address is still TENTATIVE (DAD in progress). rt6_lookup()
2693 * will return already-added prefix route via interface that
2694 * prefix route was assigned to, which might be non-loopback.
2695 */
2696 if (dev &&
2697 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
2698 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
2699 goto out;
2700 }
2701
2702 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
2703 /* IPv6 strictly inhibits using not link-local
2704 * addresses as nexthop address.
2705 * Otherwise, router will not able to send redirects.
2706 * It is very good, but in some (rare!) circumstances
2707 * (SIT, PtP, NBMA NOARP links) it is handy to allow
2708 * some exceptions. --ANK
2709 * We allow IPv4-mapped nexthops to support RFC4798-type
2710 * addressing
2711 */
2712 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
2713 NL_SET_ERR_MSG(extack, "Invalid gateway address");
2714 goto out;
2715 }
2716
2717 if (cfg->fc_flags & RTNH_F_ONLINK)
2718 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
2719 else
2720 err = ip6_route_check_nh(net, cfg, _dev, idev);
2721
2722 if (err)
2723 goto out;
2724 }
2725
2726 /* reload in case device was changed */
2727 dev = *_dev;
2728
2729 err = -EINVAL;
2730 if (!dev) {
2731 NL_SET_ERR_MSG(extack, "Egress device not specified");
2732 goto out;
2733 } else if (dev->flags & IFF_LOOPBACK) {
2734 NL_SET_ERR_MSG(extack,
2735 "Egress device can not be loopback device for this route");
2736 goto out;
2737 }
2738
2739 /* if we did not check gw_addr above, do so now that the
2740 * egress device has been resolved.
2741 */
2742 if (need_addr_check &&
2743 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
2744 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
2745 goto out;
2746 }
2747
2748 err = 0;
2749out:
2750 return err;
2751}
2752
2753static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
2754 struct netlink_ext_ack *extack)
2755{
2756 struct net *net = cfg->fc_nlinfo.nl_net;
2757 struct rt6_info *rt = NULL;
2758 struct net_device *dev = NULL;
2759 struct inet6_dev *idev = NULL;
2760 struct fib6_table *table;
2761 int addr_type;
2762 int err = -EINVAL;
2763
2764 /* RTF_PCPU is an internal flag; can not be set by userspace */
2765 if (cfg->fc_flags & RTF_PCPU) {
2766 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
2767 goto out;
2768 }
2769
2770 /* RTF_CACHE is an internal flag; can not be set by userspace */
2771 if (cfg->fc_flags & RTF_CACHE) {
2772 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
2773 goto out;
2774 }
2775
2776 if (cfg->fc_dst_len > 128) {
2777 NL_SET_ERR_MSG(extack, "Invalid prefix length");
2778 goto out;
2779 }
2780 if (cfg->fc_src_len > 128) {
2781 NL_SET_ERR_MSG(extack, "Invalid source address length");
2782 goto out;
2783 }
2784#ifndef CONFIG_IPV6_SUBTREES
2785 if (cfg->fc_src_len) {
2786 NL_SET_ERR_MSG(extack,
2787 "Specifying source address requires IPV6_SUBTREES to be enabled");
2788 goto out;
2789 }
2790#endif
2791 if (cfg->fc_ifindex) {
2792 err = -ENODEV;
2793 dev = dev_get_by_index(net, cfg->fc_ifindex);
2794 if (!dev)
2795 goto out;
2796 idev = in6_dev_get(dev);
2797 if (!idev)
2798 goto out;
2799 }
2800
2801 if (cfg->fc_metric == 0)
2802 cfg->fc_metric = IP6_RT_PRIO_USER;
2803
2804 if (cfg->fc_flags & RTNH_F_ONLINK) {
2805 if (!dev) {
2806 NL_SET_ERR_MSG(extack,
2807 "Nexthop device required for onlink");
2808 err = -ENODEV;
2809 goto out;
2810 }
2811
2812 if (!(dev->flags & IFF_UP)) {
2813 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
2814 err = -ENETDOWN;
2815 goto out;
2816 }
2817 }
2818
2819 err = -ENOBUFS;
2820 if (cfg->fc_nlinfo.nlh &&
2821 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
2822 table = fib6_get_table(net, cfg->fc_table);
2823 if (!table) {
2824 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
2825 table = fib6_new_table(net, cfg->fc_table);
2826 }
2827 } else {
2828 table = fib6_new_table(net, cfg->fc_table);
2829 }
2830
2831 if (!table)
2832 goto out;
2833
2834 rt = ip6_dst_alloc(net, NULL,
2835 (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
2836
2837 if (!rt) {
2838 err = -ENOMEM;
2839 goto out;
2840 }
2841
2842 if (cfg->fc_flags & RTF_EXPIRES)
2843 rt6_set_expires(rt, jiffies +
2844 clock_t_to_jiffies(cfg->fc_expires));
2845 else
2846 rt6_clean_expires(rt);
2847
2848 if (cfg->fc_protocol == RTPROT_UNSPEC)
2849 cfg->fc_protocol = RTPROT_BOOT;
2850 rt->rt6i_protocol = cfg->fc_protocol;
2851
2852 addr_type = ipv6_addr_type(&cfg->fc_dst);
2853
2854 if (addr_type & IPV6_ADDR_MULTICAST)
2855 rt->dst.input = ip6_mc_input;
2856 else if (cfg->fc_flags & RTF_LOCAL)
2857 rt->dst.input = ip6_input;
2858 else
2859 rt->dst.input = ip6_forward;
2860
2861 rt->dst.output = ip6_output;
2862
2863 if (cfg->fc_encap) {
2864 struct lwtunnel_state *lwtstate;
2865
2866 err = lwtunnel_build_state(cfg->fc_encap_type,
2867 cfg->fc_encap, AF_INET6, cfg,
2868 &lwtstate, extack);
2869 if (err)
2870 goto out;
2871 rt->dst.lwtstate = lwtstate_get(lwtstate);
2872 lwtunnel_set_redirect(&rt->dst);
2873 }
2874
2875 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
2876 rt->rt6i_dst.plen = cfg->fc_dst_len;
2877 if (rt->rt6i_dst.plen == 128)
2878 rt->dst.flags |= DST_HOST;
2879
2880#ifdef CONFIG_IPV6_SUBTREES
2881 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
2882 rt->rt6i_src.plen = cfg->fc_src_len;
2883#endif
2884
2885 rt->rt6i_metric = cfg->fc_metric;
2886 rt->rt6i_nh_weight = 1;
2887
2888 /* We cannot add true routes via loopback here,
2889 they would result in kernel looping; promote them to reject routes
2890 */
2891 if ((cfg->fc_flags & RTF_REJECT) ||
2892 (dev && (dev->flags & IFF_LOOPBACK) &&
2893 !(addr_type & IPV6_ADDR_LOOPBACK) &&
2894 !(cfg->fc_flags & RTF_LOCAL))) {
2895 /* hold loopback dev/idev if we haven't done so. */
2896 if (dev != net->loopback_dev) {
2897 if (dev) {
2898 dev_put(dev);
2899 in6_dev_put(idev);
2900 }
2901 dev = net->loopback_dev;
2902 dev_hold(dev);
2903 idev = in6_dev_get(dev);
2904 if (!idev) {
2905 err = -ENODEV;
2906 goto out;
2907 }
2908 }
2909 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
2910 switch (cfg->fc_type) {
2911 case RTN_BLACKHOLE:
2912 rt->dst.error = -EINVAL;
2913 rt->dst.output = dst_discard_out;
2914 rt->dst.input = dst_discard;
2915 break;
2916 case RTN_PROHIBIT:
2917 rt->dst.error = -EACCES;
2918 rt->dst.output = ip6_pkt_prohibit_out;
2919 rt->dst.input = ip6_pkt_prohibit;
2920 break;
2921 case RTN_THROW:
2922 case RTN_UNREACHABLE:
2923 default:
2924 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
2925 : (cfg->fc_type == RTN_UNREACHABLE)
2926 ? -EHOSTUNREACH : -ENETUNREACH;
2927 rt->dst.output = ip6_pkt_discard_out;
2928 rt->dst.input = ip6_pkt_discard;
2929 break;
2930 }
2931 goto install_route;
2932 }
2933
2934 if (cfg->fc_flags & RTF_GATEWAY) {
2935 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
2936 if (err)
2937 goto out;
2938
2939 rt->rt6i_gateway = cfg->fc_gateway;
2940 }
2941
2942 err = -ENODEV;
2943 if (!dev)
2944 goto out;
2945
2946 if (idev->cnf.disable_ipv6) {
2947 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
2948 err = -EACCES;
2949 goto out;
2950 }
2951
2952 if (!(dev->flags & IFF_UP)) {
2953 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
2954 err = -ENETDOWN;
2955 goto out;
2956 }
2957
2958 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
2959 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
2960 NL_SET_ERR_MSG(extack, "Invalid source address");
2961 err = -EINVAL;
2962 goto out;
2963 }
2964 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
2965 rt->rt6i_prefsrc.plen = 128;
2966 } else
2967 rt->rt6i_prefsrc.plen = 0;
2968
2969 rt->rt6i_flags = cfg->fc_flags;
2970
2971install_route:
2972 if (!(rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
2973 !netif_carrier_ok(dev))
2974 rt->rt6i_nh_flags |= RTNH_F_LINKDOWN;
2975 rt->rt6i_nh_flags |= (cfg->fc_flags & RTNH_F_ONLINK);
2976 rt->dst.dev = dev;
2977 rt->rt6i_idev = idev;
2978 rt->rt6i_table = table;
2979
2980 cfg->fc_nlinfo.nl_net = dev_net(dev);
2981
2982 return rt;
2983out:
2984 if (dev)
2985 dev_put(dev);
2986 if (idev)
2987 in6_dev_put(idev);
2988 if (rt)
2989 dst_release_immediate(&rt->dst);
2990
2991 return ERR_PTR(err);
2992}
2993
2994int ip6_route_add(struct fib6_config *cfg,
2995 struct netlink_ext_ack *extack)
2996{
2997 struct mx6_config mxc = { .mx = NULL, };
2998 struct rt6_info *rt;
2999 int err;
3000
3001 rt = ip6_route_info_create(cfg, extack);
3002 if (IS_ERR(rt)) {
3003 err = PTR_ERR(rt);
3004 rt = NULL;
3005 goto out;
3006 }
3007
3008 err = ip6_convert_metrics(&mxc, cfg);
3009 if (err)
3010 goto out;
3011
3012 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc, extack);
3013
3014 kfree(mxc.mx);
3015
3016 return err;
3017out:
3018 if (rt)
3019 dst_release_immediate(&rt->dst);
3020
3021 return err;
3022}
3023
3024static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
3025{
3026 int err;
3027 struct fib6_table *table;
3028 struct net *net = dev_net(rt->dst.dev);
3029
3030 if (rt == net->ipv6.ip6_null_entry) {
3031 err = -ENOENT;
3032 goto out;
3033 }
3034
3035 table = rt->rt6i_table;
3036 spin_lock_bh(&table->tb6_lock);
3037 err = fib6_del(rt, info);
3038 spin_unlock_bh(&table->tb6_lock);
3039
3040out:
3041 ip6_rt_put(rt);
3042 return err;
3043}
3044
3045int ip6_del_rt(struct rt6_info *rt)
3046{
3047 struct nl_info info = {
3048 .nl_net = dev_net(rt->dst.dev),
3049 };
3050 return __ip6_del_rt(rt, &info);
3051}
3052
3053static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
3054{
3055 struct nl_info *info = &cfg->fc_nlinfo;
3056 struct net *net = info->nl_net;
3057 struct sk_buff *skb = NULL;
3058 struct fib6_table *table;
3059 int err = -ENOENT;
3060
3061 if (rt == net->ipv6.ip6_null_entry)
3062 goto out_put;
3063 table = rt->rt6i_table;
3064 spin_lock_bh(&table->tb6_lock);
3065
3066 if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) {
3067 struct rt6_info *sibling, *next_sibling;
3068
3069 /* prefer to send a single notification with all hops */
3070 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3071 if (skb) {
3072 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3073
3074 if (rt6_fill_node(net, skb, rt,
3075 NULL, NULL, 0, RTM_DELROUTE,
3076 info->portid, seq, 0) < 0) {
3077 kfree_skb(skb);
3078 skb = NULL;
3079 } else
3080 info->skip_notify = 1;
3081 }
3082
3083 list_for_each_entry_safe(sibling, next_sibling,
3084 &rt->rt6i_siblings,
3085 rt6i_siblings) {
3086 err = fib6_del(sibling, info);
3087 if (err)
3088 goto out_unlock;
3089 }
3090 }
3091
3092 err = fib6_del(rt, info);
3093out_unlock:
3094 spin_unlock_bh(&table->tb6_lock);
3095out_put:
3096 ip6_rt_put(rt);
3097
3098 if (skb) {
3099 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3100 info->nlh, gfp_any());
3101 }
3102 return err;
3103}
3104
3105static int ip6_route_del(struct fib6_config *cfg,
3106 struct netlink_ext_ack *extack)
3107{
3108 struct rt6_info *rt, *rt_cache;
3109 struct fib6_table *table;
3110 struct fib6_node *fn;
3111 int err = -ESRCH;
3112
3113 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
3114 if (!table) {
3115 NL_SET_ERR_MSG(extack, "FIB table does not exist");
3116 return err;
3117 }
3118
3119 rcu_read_lock();
3120
3121 fn = fib6_locate(&table->tb6_root,
3122 &cfg->fc_dst, cfg->fc_dst_len,
3123 &cfg->fc_src, cfg->fc_src_len,
3124 !(cfg->fc_flags & RTF_CACHE));
3125
3126 if (fn) {
3127 for_each_fib6_node_rt_rcu(fn) {
3128 if (cfg->fc_flags & RTF_CACHE) {
3129 rt_cache = rt6_find_cached_rt(rt, &cfg->fc_dst,
3130 &cfg->fc_src);
3131 if (!rt_cache)
3132 continue;
3133 rt = rt_cache;
3134 }
3135 if (cfg->fc_ifindex &&
3136 (!rt->dst.dev ||
3137 rt->dst.dev->ifindex != cfg->fc_ifindex))
3138 continue;
3139 if (cfg->fc_flags & RTF_GATEWAY &&
3140 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3141 continue;
3142 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
3143 continue;
3144 if (cfg->fc_protocol && cfg->fc_protocol != rt->rt6i_protocol)
3145 continue;
3146 if (!dst_hold_safe(&rt->dst))
3147 break;
3148 rcu_read_unlock();
3149
3150 /* if gateway was specified only delete the one hop */
3151 if (cfg->fc_flags & RTF_GATEWAY)
3152 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3153
3154 return __ip6_del_rt_siblings(rt, cfg);
3155 }
3156 }
3157 rcu_read_unlock();
3158
3159 return err;
3160}
3161
3162static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
3163{
3164 struct netevent_redirect netevent;
3165 struct rt6_info *rt, *nrt = NULL;
3166 struct ndisc_options ndopts;
3167 struct inet6_dev *in6_dev;
3168 struct neighbour *neigh;
3169 struct rd_msg *msg;
3170 int optlen, on_link;
3171 u8 *lladdr;
3172
3173 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
3174 optlen -= sizeof(*msg);
3175
3176 if (optlen < 0) {
3177 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
3178 return;
3179 }
3180
3181 msg = (struct rd_msg *)icmp6_hdr(skb);
3182
3183 if (ipv6_addr_is_multicast(&msg->dest)) {
3184 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
3185 return;
3186 }
3187
3188 on_link = 0;
3189 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
3190 on_link = 1;
3191 } else if (ipv6_addr_type(&msg->target) !=
3192 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
3193 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
3194 return;
3195 }
3196
3197 in6_dev = __in6_dev_get(skb->dev);
3198 if (!in6_dev)
3199 return;
3200 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
3201 return;
3202
3203 /* RFC2461 8.1:
3204 * The IP source address of the Redirect MUST be the same as the current
3205 * first-hop router for the specified ICMP Destination Address.
3206 */
3207
3208 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
3209 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
3210 return;
3211 }
3212
3213 lladdr = NULL;
3214 if (ndopts.nd_opts_tgt_lladdr) {
3215 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
3216 skb->dev);
3217 if (!lladdr) {
3218 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
3219 return;
3220 }
3221 }
3222
3223 rt = (struct rt6_info *) dst;
3224 if (rt->rt6i_flags & RTF_REJECT) {
3225 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
3226 return;
3227 }
3228
3229 /* Redirect received -> path was valid.
3230 * Look, redirects are sent only in response to data packets,
3231 * so that this nexthop apparently is reachable. --ANK
3232 */
3233 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
3234
3235 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
3236 if (!neigh)
3237 return;
3238
3239 /*
3240 * We have finally decided to accept it.
3241 */
3242
3243 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
3244 NEIGH_UPDATE_F_WEAK_OVERRIDE|
3245 NEIGH_UPDATE_F_OVERRIDE|
3246 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
3247 NEIGH_UPDATE_F_ISROUTER)),
3248 NDISC_REDIRECT, &ndopts);
3249
3250 nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
3251 if (!nrt)
3252 goto out;
3253
3254 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
3255 if (on_link)
3256 nrt->rt6i_flags &= ~RTF_GATEWAY;
3257
3258 nrt->rt6i_protocol = RTPROT_REDIRECT;
3259 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
3260
3261 /* No need to remove rt from the exception table if rt is
3262 * a cached route because rt6_insert_exception() will
3263 * takes care of it
3264 */
3265 if (rt6_insert_exception(nrt, rt)) {
3266 dst_release_immediate(&nrt->dst);
3267 goto out;
3268 }
3269
3270 netevent.old = &rt->dst;
3271 netevent.new = &nrt->dst;
3272 netevent.daddr = &msg->dest;
3273 netevent.neigh = neigh;
3274 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
3275
3276out:
3277 neigh_release(neigh);
3278}
3279
3280/*
3281 * Misc support functions
3282 */
3283
3284static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
3285{
3286 BUG_ON(from->from);
3287
3288 rt->rt6i_flags &= ~RTF_EXPIRES;
3289 dst_hold(&from->dst);
3290 rt->from = from;
3291 dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
3292}
3293
3294static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
3295{
3296 rt->dst.input = ort->dst.input;
3297 rt->dst.output = ort->dst.output;
3298 rt->rt6i_dst = ort->rt6i_dst;
3299 rt->dst.error = ort->dst.error;
3300 rt->rt6i_idev = ort->rt6i_idev;
3301 if (rt->rt6i_idev)
3302 in6_dev_hold(rt->rt6i_idev);
3303 rt->dst.lastuse = jiffies;
3304 rt->rt6i_gateway = ort->rt6i_gateway;
3305 rt->rt6i_flags = ort->rt6i_flags;
3306 rt6_set_from(rt, ort);
3307 rt->rt6i_metric = ort->rt6i_metric;
3308#ifdef CONFIG_IPV6_SUBTREES
3309 rt->rt6i_src = ort->rt6i_src;
3310#endif
3311 rt->rt6i_prefsrc = ort->rt6i_prefsrc;
3312 rt->rt6i_table = ort->rt6i_table;
3313 rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
3314}
3315
3316#ifdef CONFIG_IPV6_ROUTE_INFO
3317static struct rt6_info *rt6_get_route_info(struct net *net,
3318 const struct in6_addr *prefix, int prefixlen,
3319 const struct in6_addr *gwaddr,
3320 struct net_device *dev)
3321{
3322 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
3323 int ifindex = dev->ifindex;
3324 struct fib6_node *fn;
3325 struct rt6_info *rt = NULL;
3326 struct fib6_table *table;
3327
3328 table = fib6_get_table(net, tb_id);
3329 if (!table)
3330 return NULL;
3331
3332 rcu_read_lock();
3333 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
3334 if (!fn)
3335 goto out;
3336
3337 for_each_fib6_node_rt_rcu(fn) {
3338 if (rt->dst.dev->ifindex != ifindex)
3339 continue;
3340 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
3341 continue;
3342 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
3343 continue;
3344 ip6_hold_safe(NULL, &rt, false);
3345 break;
3346 }
3347out:
3348 rcu_read_unlock();
3349 return rt;
3350}
3351
3352static struct rt6_info *rt6_add_route_info(struct net *net,
3353 const struct in6_addr *prefix, int prefixlen,
3354 const struct in6_addr *gwaddr,
3355 struct net_device *dev,
3356 unsigned int pref)
3357{
3358 struct fib6_config cfg = {
3359 .fc_metric = IP6_RT_PRIO_USER,
3360 .fc_ifindex = dev->ifindex,
3361 .fc_dst_len = prefixlen,
3362 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
3363 RTF_UP | RTF_PREF(pref),
3364 .fc_protocol = RTPROT_RA,
3365 .fc_nlinfo.portid = 0,
3366 .fc_nlinfo.nlh = NULL,
3367 .fc_nlinfo.nl_net = net,
3368 };
3369
3370 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
3371 cfg.fc_dst = *prefix;
3372 cfg.fc_gateway = *gwaddr;
3373
3374 /* We should treat it as a default route if prefix length is 0. */
3375 if (!prefixlen)
3376 cfg.fc_flags |= RTF_DEFAULT;
3377
3378 ip6_route_add(&cfg, NULL);
3379
3380 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
3381}
3382#endif
3383
3384struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
3385{
3386 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
3387 struct rt6_info *rt;
3388 struct fib6_table *table;
3389
3390 table = fib6_get_table(dev_net(dev), tb_id);
3391 if (!table)
3392 return NULL;
3393
3394 rcu_read_lock();
3395 for_each_fib6_node_rt_rcu(&table->tb6_root) {
3396 if (dev == rt->dst.dev &&
3397 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
3398 ipv6_addr_equal(&rt->rt6i_gateway, addr))
3399 break;
3400 }
3401 if (rt)
3402 ip6_hold_safe(NULL, &rt, false);
3403 rcu_read_unlock();
3404 return rt;
3405}
3406
3407struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
3408 struct net_device *dev,
3409 unsigned int pref)
3410{
3411 struct fib6_config cfg = {
3412 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
3413 .fc_metric = IP6_RT_PRIO_USER,
3414 .fc_ifindex = dev->ifindex,
3415 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
3416 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
3417 .fc_protocol = RTPROT_RA,
3418 .fc_nlinfo.portid = 0,
3419 .fc_nlinfo.nlh = NULL,
3420 .fc_nlinfo.nl_net = dev_net(dev),
3421 };
3422
3423 cfg.fc_gateway = *gwaddr;
3424
3425 if (!ip6_route_add(&cfg, NULL)) {
3426 struct fib6_table *table;
3427
3428 table = fib6_get_table(dev_net(dev), cfg.fc_table);
3429 if (table)
3430 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
3431 }
3432
3433 return rt6_get_dflt_router(gwaddr, dev);
3434}
3435
3436static void __rt6_purge_dflt_routers(struct fib6_table *table)
3437{
3438 struct rt6_info *rt;
3439
3440restart:
3441 rcu_read_lock();
3442 for_each_fib6_node_rt_rcu(&table->tb6_root) {
3443 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
3444 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
3445 if (dst_hold_safe(&rt->dst)) {
3446 rcu_read_unlock();
3447 ip6_del_rt(rt);
3448 } else {
3449 rcu_read_unlock();
3450 }
3451 goto restart;
3452 }
3453 }
3454 rcu_read_unlock();
3455
3456 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
3457}
3458
3459void rt6_purge_dflt_routers(struct net *net)
3460{
3461 struct fib6_table *table;
3462 struct hlist_head *head;
3463 unsigned int h;
3464
3465 rcu_read_lock();
3466
3467 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
3468 head = &net->ipv6.fib_table_hash[h];
3469 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
3470 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
3471 __rt6_purge_dflt_routers(table);
3472 }
3473 }
3474
3475 rcu_read_unlock();
3476}
3477
3478static void rtmsg_to_fib6_config(struct net *net,
3479 struct in6_rtmsg *rtmsg,
3480 struct fib6_config *cfg)
3481{
3482 memset(cfg, 0, sizeof(*cfg));
3483
3484 cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
3485 : RT6_TABLE_MAIN;
3486 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
3487 cfg->fc_metric = rtmsg->rtmsg_metric;
3488 cfg->fc_expires = rtmsg->rtmsg_info;
3489 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
3490 cfg->fc_src_len = rtmsg->rtmsg_src_len;
3491 cfg->fc_flags = rtmsg->rtmsg_flags;
3492
3493 cfg->fc_nlinfo.nl_net = net;
3494
3495 cfg->fc_dst = rtmsg->rtmsg_dst;
3496 cfg->fc_src = rtmsg->rtmsg_src;
3497 cfg->fc_gateway = rtmsg->rtmsg_gateway;
3498}
3499
3500int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3501{
3502 struct fib6_config cfg;
3503 struct in6_rtmsg rtmsg;
3504 int err;
3505
3506 switch (cmd) {
3507 case SIOCADDRT: /* Add a route */
3508 case SIOCDELRT: /* Delete a route */
3509 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3510 return -EPERM;
3511 err = copy_from_user(&rtmsg, arg,
3512 sizeof(struct in6_rtmsg));
3513 if (err)
3514 return -EFAULT;
3515
3516 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
3517
3518 rtnl_lock();
3519 switch (cmd) {
3520 case SIOCADDRT:
3521 err = ip6_route_add(&cfg, NULL);
3522 break;
3523 case SIOCDELRT:
3524 err = ip6_route_del(&cfg, NULL);
3525 break;
3526 default:
3527 err = -EINVAL;
3528 }
3529 rtnl_unlock();
3530
3531 return err;
3532 }
3533
3534 return -EINVAL;
3535}
3536
3537/*
3538 * Drop the packet on the floor
3539 */
3540
3541static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
3542{
3543 int type;
3544 struct dst_entry *dst = skb_dst(skb);
3545 switch (ipstats_mib_noroutes) {
3546 case IPSTATS_MIB_INNOROUTES:
3547 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
3548 if (type == IPV6_ADDR_ANY) {
3549 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
3550 IPSTATS_MIB_INADDRERRORS);
3551 break;
3552 }
3553 /* FALLTHROUGH */
3554 case IPSTATS_MIB_OUTNOROUTES:
3555 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
3556 ipstats_mib_noroutes);
3557 break;
3558 }
3559 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
3560 kfree_skb(skb);
3561 return 0;
3562}
3563
3564static int ip6_pkt_discard(struct sk_buff *skb)
3565{
3566 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
3567}
3568
3569static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
3570{
3571 skb->dev = skb_dst(skb)->dev;
3572 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
3573}
3574
3575static int ip6_pkt_prohibit(struct sk_buff *skb)
3576{
3577 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
3578}
3579
3580static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
3581{
3582 skb->dev = skb_dst(skb)->dev;
3583 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
3584}
3585
3586/*
3587 * Allocate a dst for local (unicast / anycast) address.
3588 */
3589
3590struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
3591 const struct in6_addr *addr,
3592 bool anycast)
3593{
3594 u32 tb_id;
3595 struct net *net = dev_net(idev->dev);
3596 struct net_device *dev = idev->dev;
3597 struct rt6_info *rt;
3598
3599 rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
3600 if (!rt)
3601 return ERR_PTR(-ENOMEM);
3602
3603 in6_dev_hold(idev);
3604
3605 rt->dst.flags |= DST_HOST;
3606 rt->dst.input = ip6_input;
3607 rt->dst.output = ip6_output;
3608 rt->rt6i_idev = idev;
3609
3610 rt->rt6i_protocol = RTPROT_KERNEL;
3611 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
3612 if (anycast)
3613 rt->rt6i_flags |= RTF_ANYCAST;
3614 else
3615 rt->rt6i_flags |= RTF_LOCAL;
3616
3617 rt->rt6i_gateway = *addr;
3618 rt->rt6i_dst.addr = *addr;
3619 rt->rt6i_dst.plen = 128;
3620 tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
3621 rt->rt6i_table = fib6_get_table(net, tb_id);
3622
3623 return rt;
3624}
3625
3626/* remove deleted ip from prefsrc entries */
3627struct arg_dev_net_ip {
3628 struct net_device *dev;
3629 struct net *net;
3630 struct in6_addr *addr;
3631};
3632
3633static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
3634{
3635 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
3636 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
3637 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
3638
3639 if (((void *)rt->dst.dev == dev || !dev) &&
3640 rt != net->ipv6.ip6_null_entry &&
3641 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
3642 spin_lock_bh(&rt6_exception_lock);
3643 /* remove prefsrc entry */
3644 rt->rt6i_prefsrc.plen = 0;
3645 /* need to update cache as well */
3646 rt6_exceptions_remove_prefsrc(rt);
3647 spin_unlock_bh(&rt6_exception_lock);
3648 }
3649 return 0;
3650}
3651
3652void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
3653{
3654 struct net *net = dev_net(ifp->idev->dev);
3655 struct arg_dev_net_ip adni = {
3656 .dev = ifp->idev->dev,
3657 .net = net,
3658 .addr = &ifp->addr,
3659 };
3660 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
3661}
3662
3663#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
3664
3665/* Remove routers and update dst entries when gateway turn into host. */
3666static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
3667{
3668 struct in6_addr *gateway = (struct in6_addr *)arg;
3669
3670 if (((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
3671 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
3672 return -1;
3673 }
3674
3675 /* Further clean up cached routes in exception table.
3676 * This is needed because cached route may have a different
3677 * gateway than its 'parent' in the case of an ip redirect.
3678 */
3679 rt6_exceptions_clean_tohost(rt, gateway);
3680
3681 return 0;
3682}
3683
3684void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
3685{
3686 fib6_clean_all(net, fib6_clean_tohost, gateway);
3687}
3688
3689struct arg_netdev_event {
3690 const struct net_device *dev;
3691 union {
3692 unsigned int nh_flags;
3693 unsigned long event;
3694 };
3695};
3696
3697static struct rt6_info *rt6_multipath_first_sibling(const struct rt6_info *rt)
3698{
3699 struct rt6_info *iter;
3700 struct fib6_node *fn;
3701
3702 fn = rcu_dereference_protected(rt->rt6i_node,
3703 lockdep_is_held(&rt->rt6i_table->tb6_lock));
3704 iter = rcu_dereference_protected(fn->leaf,
3705 lockdep_is_held(&rt->rt6i_table->tb6_lock));
3706 while (iter) {
3707 if (iter->rt6i_metric == rt->rt6i_metric &&
3708 rt6_qualify_for_ecmp(iter))
3709 return iter;
3710 iter = rcu_dereference_protected(iter->rt6_next,
3711 lockdep_is_held(&rt->rt6i_table->tb6_lock));
3712 }
3713
3714 return NULL;
3715}
3716
3717static bool rt6_is_dead(const struct rt6_info *rt)
3718{
3719 if (rt->rt6i_nh_flags & RTNH_F_DEAD ||
3720 (rt->rt6i_nh_flags & RTNH_F_LINKDOWN &&
3721 rt->rt6i_idev->cnf.ignore_routes_with_linkdown))
3722 return true;
3723
3724 return false;
3725}
3726
3727static int rt6_multipath_total_weight(const struct rt6_info *rt)
3728{
3729 struct rt6_info *iter;
3730 int total = 0;
3731
3732 if (!rt6_is_dead(rt))
3733 total += rt->rt6i_nh_weight;
3734
3735 list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings) {
3736 if (!rt6_is_dead(iter))
3737 total += iter->rt6i_nh_weight;
3738 }
3739
3740 return total;
3741}
3742
3743static void rt6_upper_bound_set(struct rt6_info *rt, int *weight, int total)
3744{
3745 int upper_bound = -1;
3746
3747 if (!rt6_is_dead(rt)) {
3748 *weight += rt->rt6i_nh_weight;
3749 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
3750 total) - 1;
3751 }
3752 atomic_set(&rt->rt6i_nh_upper_bound, upper_bound);
3753}
3754
3755static void rt6_multipath_upper_bound_set(struct rt6_info *rt, int total)
3756{
3757 struct rt6_info *iter;
3758 int weight = 0;
3759
3760 rt6_upper_bound_set(rt, &weight, total);
3761
3762 list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
3763 rt6_upper_bound_set(iter, &weight, total);
3764}
3765
3766void rt6_multipath_rebalance(struct rt6_info *rt)
3767{
3768 struct rt6_info *first;
3769 int total;
3770
3771 /* In case the entire multipath route was marked for flushing,
3772 * then there is no need to rebalance upon the removal of every
3773 * sibling route.
3774 */
3775 if (!rt->rt6i_nsiblings || rt->should_flush)
3776 return;
3777
3778 /* During lookup routes are evaluated in order, so we need to
3779 * make sure upper bounds are assigned from the first sibling
3780 * onwards.
3781 */
3782 first = rt6_multipath_first_sibling(rt);
3783 if (WARN_ON_ONCE(!first))
3784 return;
3785
3786 total = rt6_multipath_total_weight(first);
3787 rt6_multipath_upper_bound_set(first, total);
3788}
3789
3790static int fib6_ifup(struct rt6_info *rt, void *p_arg)
3791{
3792 const struct arg_netdev_event *arg = p_arg;
3793 const struct net *net = dev_net(arg->dev);
3794
3795 if (rt != net->ipv6.ip6_null_entry && rt->dst.dev == arg->dev) {
3796 rt->rt6i_nh_flags &= ~arg->nh_flags;
3797 fib6_update_sernum_upto_root(dev_net(rt->dst.dev), rt);
3798 rt6_multipath_rebalance(rt);
3799 }
3800
3801 return 0;
3802}
3803
3804void rt6_sync_up(struct net_device *dev, unsigned int nh_flags)
3805{
3806 struct arg_netdev_event arg = {
3807 .dev = dev,
3808 {
3809 .nh_flags = nh_flags,
3810 },
3811 };
3812
3813 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
3814 arg.nh_flags |= RTNH_F_LINKDOWN;
3815
3816 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
3817}
3818
3819static bool rt6_multipath_uses_dev(const struct rt6_info *rt,
3820 const struct net_device *dev)
3821{
3822 struct rt6_info *iter;
3823
3824 if (rt->dst.dev == dev)
3825 return true;
3826 list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
3827 if (iter->dst.dev == dev)
3828 return true;
3829
3830 return false;
3831}
3832
3833static void rt6_multipath_flush(struct rt6_info *rt)
3834{
3835 struct rt6_info *iter;
3836
3837 rt->should_flush = 1;
3838 list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
3839 iter->should_flush = 1;
3840}
3841
3842static unsigned int rt6_multipath_dead_count(const struct rt6_info *rt,
3843 const struct net_device *down_dev)
3844{
3845 struct rt6_info *iter;
3846 unsigned int dead = 0;
3847
3848 if (rt->dst.dev == down_dev || rt->rt6i_nh_flags & RTNH_F_DEAD)
3849 dead++;
3850 list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
3851 if (iter->dst.dev == down_dev ||
3852 iter->rt6i_nh_flags & RTNH_F_DEAD)
3853 dead++;
3854
3855 return dead;
3856}
3857
3858static void rt6_multipath_nh_flags_set(struct rt6_info *rt,
3859 const struct net_device *dev,
3860 unsigned int nh_flags)
3861{
3862 struct rt6_info *iter;
3863
3864 if (rt->dst.dev == dev)
3865 rt->rt6i_nh_flags |= nh_flags;
3866 list_for_each_entry(iter, &rt->rt6i_siblings, rt6i_siblings)
3867 if (iter->dst.dev == dev)
3868 iter->rt6i_nh_flags |= nh_flags;
3869}
3870
3871/* called with write lock held for table with rt */
3872static int fib6_ifdown(struct rt6_info *rt, void *p_arg)
3873{
3874 const struct arg_netdev_event *arg = p_arg;
3875 const struct net_device *dev = arg->dev;
3876 const struct net *net = dev_net(dev);
3877
3878 if (rt == net->ipv6.ip6_null_entry)
3879 return 0;
3880
3881 switch (arg->event) {
3882 case NETDEV_UNREGISTER:
3883 return rt->dst.dev == dev ? -1 : 0;
3884 case NETDEV_DOWN:
3885 if (rt->should_flush)
3886 return -1;
3887 if (!rt->rt6i_nsiblings)
3888 return rt->dst.dev == dev ? -1 : 0;
3889 if (rt6_multipath_uses_dev(rt, dev)) {
3890 unsigned int count;
3891
3892 count = rt6_multipath_dead_count(rt, dev);
3893 if (rt->rt6i_nsiblings + 1 == count) {
3894 rt6_multipath_flush(rt);
3895 return -1;
3896 }
3897 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
3898 RTNH_F_LINKDOWN);
3899 fib6_update_sernum(rt);
3900 rt6_multipath_rebalance(rt);
3901 }
3902 return -2;
3903 case NETDEV_CHANGE:
3904 if (rt->dst.dev != dev ||
3905 rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST))
3906 break;
3907 rt->rt6i_nh_flags |= RTNH_F_LINKDOWN;
3908 rt6_multipath_rebalance(rt);
3909 break;
3910 }
3911
3912 return 0;
3913}
3914
3915void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
3916{
3917 struct arg_netdev_event arg = {
3918 .dev = dev,
3919 {
3920 .event = event,
3921 },
3922 };
3923
3924 fib6_clean_all(dev_net(dev), fib6_ifdown, &arg);
3925}
3926
3927void rt6_disable_ip(struct net_device *dev, unsigned long event)
3928{
3929 rt6_sync_down_dev(dev, event);
3930 rt6_uncached_list_flush_dev(dev_net(dev), dev);
3931 neigh_ifdown(&nd_tbl, dev);
3932}
3933
3934struct rt6_mtu_change_arg {
3935 struct net_device *dev;
3936 unsigned int mtu;
3937};
3938
3939static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
3940{
3941 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
3942 struct inet6_dev *idev;
3943
3944 /* In IPv6 pmtu discovery is not optional,
3945 so that RTAX_MTU lock cannot disable it.
3946 We still use this lock to block changes
3947 caused by addrconf/ndisc.
3948 */
3949
3950 idev = __in6_dev_get(arg->dev);
3951 if (!idev)
3952 return 0;
3953
3954 /* For administrative MTU increase, there is no way to discover
3955 IPv6 PMTU increase, so PMTU increase should be updated here.
3956 Since RFC 1981 doesn't include administrative MTU increase
3957 update PMTU increase is a MUST. (i.e. jumbo frame)
3958 */
3959 if (rt->dst.dev == arg->dev &&
3960 !dst_metric_locked(&rt->dst, RTAX_MTU)) {
3961 spin_lock_bh(&rt6_exception_lock);
3962 if (dst_metric_raw(&rt->dst, RTAX_MTU) &&
3963 rt6_mtu_change_route_allowed(idev, rt, arg->mtu))
3964 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
3965 rt6_exceptions_update_pmtu(idev, rt, arg->mtu);
3966 spin_unlock_bh(&rt6_exception_lock);
3967 }
3968 return 0;
3969}
3970
3971void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
3972{
3973 struct rt6_mtu_change_arg arg = {
3974 .dev = dev,
3975 .mtu = mtu,
3976 };
3977
3978 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
3979}
3980
3981static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
3982 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
3983 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
3984 [RTA_OIF] = { .type = NLA_U32 },
3985 [RTA_IIF] = { .type = NLA_U32 },
3986 [RTA_PRIORITY] = { .type = NLA_U32 },
3987 [RTA_METRICS] = { .type = NLA_NESTED },
3988 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
3989 [RTA_PREF] = { .type = NLA_U8 },
3990 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
3991 [RTA_ENCAP] = { .type = NLA_NESTED },
3992 [RTA_EXPIRES] = { .type = NLA_U32 },
3993 [RTA_UID] = { .type = NLA_U32 },
3994 [RTA_MARK] = { .type = NLA_U32 },
3995 [RTA_TABLE] = { .type = NLA_U32 },
3996};
3997
3998static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
3999 struct fib6_config *cfg,
4000 struct netlink_ext_ack *extack)
4001{
4002 struct rtmsg *rtm;
4003 struct nlattr *tb[RTA_MAX+1];
4004 unsigned int pref;
4005 int err;
4006
4007 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
4008 NULL);
4009 if (err < 0)
4010 goto errout;
4011
4012 err = -EINVAL;
4013 rtm = nlmsg_data(nlh);
4014 memset(cfg, 0, sizeof(*cfg));
4015
4016 cfg->fc_table = rtm->rtm_table;
4017 cfg->fc_dst_len = rtm->rtm_dst_len;
4018 cfg->fc_src_len = rtm->rtm_src_len;
4019 cfg->fc_flags = RTF_UP;
4020 cfg->fc_protocol = rtm->rtm_protocol;
4021 cfg->fc_type = rtm->rtm_type;
4022
4023 if (rtm->rtm_type == RTN_UNREACHABLE ||
4024 rtm->rtm_type == RTN_BLACKHOLE ||
4025 rtm->rtm_type == RTN_PROHIBIT ||
4026 rtm->rtm_type == RTN_THROW)
4027 cfg->fc_flags |= RTF_REJECT;
4028
4029 if (rtm->rtm_type == RTN_LOCAL)
4030 cfg->fc_flags |= RTF_LOCAL;
4031
4032 if (rtm->rtm_flags & RTM_F_CLONED)
4033 cfg->fc_flags |= RTF_CACHE;
4034
4035 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
4036
4037 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
4038 cfg->fc_nlinfo.nlh = nlh;
4039 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
4040
4041 if (tb[RTA_GATEWAY]) {
4042 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
4043 cfg->fc_flags |= RTF_GATEWAY;
4044 }
4045
4046 if (tb[RTA_DST]) {
4047 int plen = (rtm->rtm_dst_len + 7) >> 3;
4048
4049 if (nla_len(tb[RTA_DST]) < plen)
4050 goto errout;
4051
4052 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
4053 }
4054
4055 if (tb[RTA_SRC]) {
4056 int plen = (rtm->rtm_src_len + 7) >> 3;
4057
4058 if (nla_len(tb[RTA_SRC]) < plen)
4059 goto errout;
4060
4061 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
4062 }
4063
4064 if (tb[RTA_PREFSRC])
4065 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
4066
4067 if (tb[RTA_OIF])
4068 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
4069
4070 if (tb[RTA_PRIORITY])
4071 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
4072
4073 if (tb[RTA_METRICS]) {
4074 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
4075 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
4076 }
4077
4078 if (tb[RTA_TABLE])
4079 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
4080
4081 if (tb[RTA_MULTIPATH]) {
4082 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
4083 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
4084
4085 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
4086 cfg->fc_mp_len, extack);
4087 if (err < 0)
4088 goto errout;
4089 }
4090
4091 if (tb[RTA_PREF]) {
4092 pref = nla_get_u8(tb[RTA_PREF]);
4093 if (pref != ICMPV6_ROUTER_PREF_LOW &&
4094 pref != ICMPV6_ROUTER_PREF_HIGH)
4095 pref = ICMPV6_ROUTER_PREF_MEDIUM;
4096 cfg->fc_flags |= RTF_PREF(pref);
4097 }
4098
4099 if (tb[RTA_ENCAP])
4100 cfg->fc_encap = tb[RTA_ENCAP];
4101
4102 if (tb[RTA_ENCAP_TYPE]) {
4103 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
4104
4105 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
4106 if (err < 0)
4107 goto errout;
4108 }
4109
4110 if (tb[RTA_EXPIRES]) {
4111 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
4112
4113 if (addrconf_finite_timeout(timeout)) {
4114 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
4115 cfg->fc_flags |= RTF_EXPIRES;
4116 }
4117 }
4118
4119 err = 0;
4120errout:
4121 return err;
4122}
4123
4124struct rt6_nh {
4125 struct rt6_info *rt6_info;
4126 struct fib6_config r_cfg;
4127 struct mx6_config mxc;
4128 struct list_head next;
4129};
4130
4131static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
4132{
4133 struct rt6_nh *nh;
4134
4135 list_for_each_entry(nh, rt6_nh_list, next) {
4136 pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6c nexthop %pI6c ifi %d\n",
4137 &nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
4138 nh->r_cfg.fc_ifindex);
4139 }
4140}
4141
4142static int ip6_route_info_append(struct list_head *rt6_nh_list,
4143 struct rt6_info *rt, struct fib6_config *r_cfg)
4144{
4145 struct rt6_nh *nh;
4146 int err = -EEXIST;
4147
4148 list_for_each_entry(nh, rt6_nh_list, next) {
4149 /* check if rt6_info already exists */
4150 if (rt6_duplicate_nexthop(nh->rt6_info, rt))
4151 return err;
4152 }
4153
4154 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
4155 if (!nh)
4156 return -ENOMEM;
4157 nh->rt6_info = rt;
4158 err = ip6_convert_metrics(&nh->mxc, r_cfg);
4159 if (err) {
4160 kfree(nh);
4161 return err;
4162 }
4163 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
4164 list_add_tail(&nh->next, rt6_nh_list);
4165
4166 return 0;
4167}
4168
4169static void ip6_route_mpath_notify(struct rt6_info *rt,
4170 struct rt6_info *rt_last,
4171 struct nl_info *info,
4172 __u16 nlflags)
4173{
4174 /* if this is an APPEND route, then rt points to the first route
4175 * inserted and rt_last points to last route inserted. Userspace
4176 * wants a consistent dump of the route which starts at the first
4177 * nexthop. Since sibling routes are always added at the end of
4178 * the list, find the first sibling of the last route appended
4179 */
4180 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->rt6i_nsiblings) {
4181 rt = list_first_entry(&rt_last->rt6i_siblings,
4182 struct rt6_info,
4183 rt6i_siblings);
4184 }
4185
4186 if (rt)
4187 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
4188}
4189
4190static int ip6_route_multipath_add(struct fib6_config *cfg,
4191 struct netlink_ext_ack *extack)
4192{
4193 struct rt6_info *rt_notif = NULL, *rt_last = NULL;
4194 struct nl_info *info = &cfg->fc_nlinfo;
4195 struct fib6_config r_cfg;
4196 struct rtnexthop *rtnh;
4197 struct rt6_info *rt;
4198 struct rt6_nh *err_nh;
4199 struct rt6_nh *nh, *nh_safe;
4200 __u16 nlflags;
4201 int remaining;
4202 int attrlen;
4203 int err = 1;
4204 int nhn = 0;
4205 int replace = (cfg->fc_nlinfo.nlh &&
4206 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
4207 LIST_HEAD(rt6_nh_list);
4208
4209 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
4210 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
4211 nlflags |= NLM_F_APPEND;
4212
4213 remaining = cfg->fc_mp_len;
4214 rtnh = (struct rtnexthop *)cfg->fc_mp;
4215
4216 /* Parse a Multipath Entry and build a list (rt6_nh_list) of
4217 * rt6_info structs per nexthop
4218 */
4219 while (rtnh_ok(rtnh, remaining)) {
4220 memcpy(&r_cfg, cfg, sizeof(*cfg));
4221 if (rtnh->rtnh_ifindex)
4222 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
4223
4224 attrlen = rtnh_attrlen(rtnh);
4225 if (attrlen > 0) {
4226 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
4227
4228 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
4229 if (nla) {
4230 r_cfg.fc_gateway = nla_get_in6_addr(nla);
4231 r_cfg.fc_flags |= RTF_GATEWAY;
4232 }
4233 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
4234 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
4235 if (nla)
4236 r_cfg.fc_encap_type = nla_get_u16(nla);
4237 }
4238
4239 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
4240 rt = ip6_route_info_create(&r_cfg, extack);
4241 if (IS_ERR(rt)) {
4242 err = PTR_ERR(rt);
4243 rt = NULL;
4244 goto cleanup;
4245 }
4246
4247 rt->rt6i_nh_weight = rtnh->rtnh_hops + 1;
4248
4249 err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
4250 if (err) {
4251 dst_release_immediate(&rt->dst);
4252 goto cleanup;
4253 }
4254
4255 rtnh = rtnh_next(rtnh, &remaining);
4256 }
4257
4258 /* for add and replace send one notification with all nexthops.
4259 * Skip the notification in fib6_add_rt2node and send one with
4260 * the full route when done
4261 */
4262 info->skip_notify = 1;
4263
4264 err_nh = NULL;
4265 list_for_each_entry(nh, &rt6_nh_list, next) {
4266 rt_last = nh->rt6_info;
4267 err = __ip6_ins_rt(nh->rt6_info, info, &nh->mxc, extack);
4268 /* save reference to first route for notification */
4269 if (!rt_notif && !err)
4270 rt_notif = nh->rt6_info;
4271
4272 /* nh->rt6_info is used or freed at this point, reset to NULL*/
4273 nh->rt6_info = NULL;
4274 if (err) {
4275 if (replace && nhn)
4276 ip6_print_replace_route_err(&rt6_nh_list);
4277 err_nh = nh;
4278 goto add_errout;
4279 }
4280
4281 /* Because each route is added like a single route we remove
4282 * these flags after the first nexthop: if there is a collision,
4283 * we have already failed to add the first nexthop:
4284 * fib6_add_rt2node() has rejected it; when replacing, old
4285 * nexthops have been replaced by first new, the rest should
4286 * be added to it.
4287 */
4288 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
4289 NLM_F_REPLACE);
4290 nhn++;
4291 }
4292
4293 /* success ... tell user about new route */
4294 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
4295 goto cleanup;
4296
4297add_errout:
4298 /* send notification for routes that were added so that
4299 * the delete notifications sent by ip6_route_del are
4300 * coherent
4301 */
4302 if (rt_notif)
4303 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
4304
4305 /* Delete routes that were already added */
4306 list_for_each_entry(nh, &rt6_nh_list, next) {
4307 if (err_nh == nh)
4308 break;
4309 ip6_route_del(&nh->r_cfg, extack);
4310 }
4311
4312cleanup:
4313 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
4314 if (nh->rt6_info)
4315 dst_release_immediate(&nh->rt6_info->dst);
4316 kfree(nh->mxc.mx);
4317 list_del(&nh->next);
4318 kfree(nh);
4319 }
4320
4321 return err;
4322}
4323
4324static int ip6_route_multipath_del(struct fib6_config *cfg,
4325 struct netlink_ext_ack *extack)
4326{
4327 struct fib6_config r_cfg;
4328 struct rtnexthop *rtnh;
4329 int remaining;
4330 int attrlen;
4331 int err = 1, last_err = 0;
4332
4333 remaining = cfg->fc_mp_len;
4334 rtnh = (struct rtnexthop *)cfg->fc_mp;
4335
4336 /* Parse a Multipath Entry */
4337 while (rtnh_ok(rtnh, remaining)) {
4338 memcpy(&r_cfg, cfg, sizeof(*cfg));
4339 if (rtnh->rtnh_ifindex)
4340 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
4341
4342 attrlen = rtnh_attrlen(rtnh);
4343 if (attrlen > 0) {
4344 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
4345
4346 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
4347 if (nla) {
4348 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
4349 r_cfg.fc_flags |= RTF_GATEWAY;
4350 }
4351 }
4352 err = ip6_route_del(&r_cfg, extack);
4353 if (err)
4354 last_err = err;
4355
4356 rtnh = rtnh_next(rtnh, &remaining);
4357 }
4358
4359 return last_err;
4360}
4361
4362static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
4363 struct netlink_ext_ack *extack)
4364{
4365 struct fib6_config cfg;
4366 int err;
4367
4368 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
4369 if (err < 0)
4370 return err;
4371
4372 if (cfg.fc_mp)
4373 return ip6_route_multipath_del(&cfg, extack);
4374 else {
4375 cfg.fc_delete_all_nh = 1;
4376 return ip6_route_del(&cfg, extack);
4377 }
4378}
4379
4380static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
4381 struct netlink_ext_ack *extack)
4382{
4383 struct fib6_config cfg;
4384 int err;
4385
4386 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
4387 if (err < 0)
4388 return err;
4389
4390 if (cfg.fc_mp)
4391 return ip6_route_multipath_add(&cfg, extack);
4392 else
4393 return ip6_route_add(&cfg, extack);
4394}
4395
4396static size_t rt6_nlmsg_size(struct rt6_info *rt)
4397{
4398 int nexthop_len = 0;
4399
4400 if (rt->rt6i_nsiblings) {
4401 nexthop_len = nla_total_size(0) /* RTA_MULTIPATH */
4402 + NLA_ALIGN(sizeof(struct rtnexthop))
4403 + nla_total_size(16) /* RTA_GATEWAY */
4404 + lwtunnel_get_encap_size(rt->dst.lwtstate);
4405
4406 nexthop_len *= rt->rt6i_nsiblings;
4407 }
4408
4409 return NLMSG_ALIGN(sizeof(struct rtmsg))
4410 + nla_total_size(16) /* RTA_SRC */
4411 + nla_total_size(16) /* RTA_DST */
4412 + nla_total_size(16) /* RTA_GATEWAY */
4413 + nla_total_size(16) /* RTA_PREFSRC */
4414 + nla_total_size(4) /* RTA_TABLE */
4415 + nla_total_size(4) /* RTA_IIF */
4416 + nla_total_size(4) /* RTA_OIF */
4417 + nla_total_size(4) /* RTA_PRIORITY */
4418 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
4419 + nla_total_size(sizeof(struct rta_cacheinfo))
4420 + nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
4421 + nla_total_size(1) /* RTA_PREF */
4422 + lwtunnel_get_encap_size(rt->dst.lwtstate)
4423 + nexthop_len;
4424}
4425
4426static int rt6_nexthop_info(struct sk_buff *skb, struct rt6_info *rt,
4427 unsigned int *flags, bool skip_oif)
4428{
4429 if (rt->rt6i_nh_flags & RTNH_F_DEAD)
4430 *flags |= RTNH_F_DEAD;
4431
4432 if (rt->rt6i_nh_flags & RTNH_F_LINKDOWN) {
4433 *flags |= RTNH_F_LINKDOWN;
4434 if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
4435 *flags |= RTNH_F_DEAD;
4436 }
4437
4438 if (rt->rt6i_flags & RTF_GATEWAY) {
4439 if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
4440 goto nla_put_failure;
4441 }
4442
4443 *flags |= (rt->rt6i_nh_flags & RTNH_F_ONLINK);
4444 if (rt->rt6i_nh_flags & RTNH_F_OFFLOAD)
4445 *flags |= RTNH_F_OFFLOAD;
4446
4447 /* not needed for multipath encoding b/c it has a rtnexthop struct */
4448 if (!skip_oif && rt->dst.dev &&
4449 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
4450 goto nla_put_failure;
4451
4452 if (rt->dst.lwtstate &&
4453 lwtunnel_fill_encap(skb, rt->dst.lwtstate) < 0)
4454 goto nla_put_failure;
4455
4456 return 0;
4457
4458nla_put_failure:
4459 return -EMSGSIZE;
4460}
4461
4462/* add multipath next hop */
4463static int rt6_add_nexthop(struct sk_buff *skb, struct rt6_info *rt)
4464{
4465 struct rtnexthop *rtnh;
4466 unsigned int flags = 0;
4467
4468 rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh));
4469 if (!rtnh)
4470 goto nla_put_failure;
4471
4472 rtnh->rtnh_hops = rt->rt6i_nh_weight - 1;
4473 rtnh->rtnh_ifindex = rt->dst.dev ? rt->dst.dev->ifindex : 0;
4474
4475 if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
4476 goto nla_put_failure;
4477
4478 rtnh->rtnh_flags = flags;
4479
4480 /* length of rtnetlink header + attributes */
4481 rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh;
4482
4483 return 0;
4484
4485nla_put_failure:
4486 return -EMSGSIZE;
4487}
4488
4489static int rt6_fill_node(struct net *net,
4490 struct sk_buff *skb, struct rt6_info *rt,
4491 struct in6_addr *dst, struct in6_addr *src,
4492 int iif, int type, u32 portid, u32 seq,
4493 unsigned int flags)
4494{
4495 u32 metrics[RTAX_MAX];
4496 struct rtmsg *rtm;
4497 struct nlmsghdr *nlh;
4498 long expires;
4499 u32 table;
4500
4501 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
4502 if (!nlh)
4503 return -EMSGSIZE;
4504
4505 rtm = nlmsg_data(nlh);
4506 rtm->rtm_family = AF_INET6;
4507 rtm->rtm_dst_len = rt->rt6i_dst.plen;
4508 rtm->rtm_src_len = rt->rt6i_src.plen;
4509 rtm->rtm_tos = 0;
4510 if (rt->rt6i_table)
4511 table = rt->rt6i_table->tb6_id;
4512 else
4513 table = RT6_TABLE_UNSPEC;
4514 rtm->rtm_table = table;
4515 if (nla_put_u32(skb, RTA_TABLE, table))
4516 goto nla_put_failure;
4517 if (rt->rt6i_flags & RTF_REJECT) {
4518 switch (rt->dst.error) {
4519 case -EINVAL:
4520 rtm->rtm_type = RTN_BLACKHOLE;
4521 break;
4522 case -EACCES:
4523 rtm->rtm_type = RTN_PROHIBIT;
4524 break;
4525 case -EAGAIN:
4526 rtm->rtm_type = RTN_THROW;
4527 break;
4528 default:
4529 rtm->rtm_type = RTN_UNREACHABLE;
4530 break;
4531 }
4532 }
4533 else if (rt->rt6i_flags & RTF_LOCAL)
4534 rtm->rtm_type = RTN_LOCAL;
4535 else if (rt->rt6i_flags & RTF_ANYCAST)
4536 rtm->rtm_type = RTN_ANYCAST;
4537 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
4538 rtm->rtm_type = RTN_LOCAL;
4539 else
4540 rtm->rtm_type = RTN_UNICAST;
4541 rtm->rtm_flags = 0;
4542 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
4543 rtm->rtm_protocol = rt->rt6i_protocol;
4544
4545 if (rt->rt6i_flags & RTF_CACHE)
4546 rtm->rtm_flags |= RTM_F_CLONED;
4547
4548 if (dst) {
4549 if (nla_put_in6_addr(skb, RTA_DST, dst))
4550 goto nla_put_failure;
4551 rtm->rtm_dst_len = 128;
4552 } else if (rtm->rtm_dst_len)
4553 if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
4554 goto nla_put_failure;
4555#ifdef CONFIG_IPV6_SUBTREES
4556 if (src) {
4557 if (nla_put_in6_addr(skb, RTA_SRC, src))
4558 goto nla_put_failure;
4559 rtm->rtm_src_len = 128;
4560 } else if (rtm->rtm_src_len &&
4561 nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
4562 goto nla_put_failure;
4563#endif
4564 if (iif) {
4565#ifdef CONFIG_IPV6_MROUTE
4566 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
4567 int err = ip6mr_get_route(net, skb, rtm, portid);
4568
4569 if (err == 0)
4570 return 0;
4571 if (err < 0)
4572 goto nla_put_failure;
4573 } else
4574#endif
4575 if (nla_put_u32(skb, RTA_IIF, iif))
4576 goto nla_put_failure;
4577 } else if (dst) {
4578 struct in6_addr saddr_buf;
4579 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
4580 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
4581 goto nla_put_failure;
4582 }
4583
4584 if (rt->rt6i_prefsrc.plen) {
4585 struct in6_addr saddr_buf;
4586 saddr_buf = rt->rt6i_prefsrc.addr;
4587 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
4588 goto nla_put_failure;
4589 }
4590
4591 memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
4592 if (rt->rt6i_pmtu)
4593 metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
4594 if (rtnetlink_put_metrics(skb, metrics) < 0)
4595 goto nla_put_failure;
4596
4597 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
4598 goto nla_put_failure;
4599
4600 /* For multipath routes, walk the siblings list and add
4601 * each as a nexthop within RTA_MULTIPATH.
4602 */
4603 if (rt->rt6i_nsiblings) {
4604 struct rt6_info *sibling, *next_sibling;
4605 struct nlattr *mp;
4606
4607 mp = nla_nest_start(skb, RTA_MULTIPATH);
4608 if (!mp)
4609 goto nla_put_failure;
4610
4611 if (rt6_add_nexthop(skb, rt) < 0)
4612 goto nla_put_failure;
4613
4614 list_for_each_entry_safe(sibling, next_sibling,
4615 &rt->rt6i_siblings, rt6i_siblings) {
4616 if (rt6_add_nexthop(skb, sibling) < 0)
4617 goto nla_put_failure;
4618 }
4619
4620 nla_nest_end(skb, mp);
4621 } else {
4622 if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
4623 goto nla_put_failure;
4624 }
4625
4626 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
4627
4628 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
4629 goto nla_put_failure;
4630
4631 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
4632 goto nla_put_failure;
4633
4634
4635 nlmsg_end(skb, nlh);
4636 return 0;
4637
4638nla_put_failure:
4639 nlmsg_cancel(skb, nlh);
4640 return -EMSGSIZE;
4641}
4642
4643int rt6_dump_route(struct rt6_info *rt, void *p_arg)
4644{
4645 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
4646 struct net *net = arg->net;
4647
4648 if (rt == net->ipv6.ip6_null_entry)
4649 return 0;
4650
4651 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
4652 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
4653
4654 /* user wants prefix routes only */
4655 if (rtm->rtm_flags & RTM_F_PREFIX &&
4656 !(rt->rt6i_flags & RTF_PREFIX_RT)) {
4657 /* success since this is not a prefix route */
4658 return 1;
4659 }
4660 }
4661
4662 return rt6_fill_node(net,
4663 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
4664 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
4665 NLM_F_MULTI);
4666}
4667
4668static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4669 struct netlink_ext_ack *extack)
4670{
4671 struct net *net = sock_net(in_skb->sk);
4672 struct nlattr *tb[RTA_MAX+1];
4673 int err, iif = 0, oif = 0;
4674 struct dst_entry *dst;
4675 struct rt6_info *rt;
4676 struct sk_buff *skb;
4677 struct rtmsg *rtm;
4678 struct flowi6 fl6;
4679 bool fibmatch;
4680
4681 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy,
4682 extack);
4683 if (err < 0)
4684 goto errout;
4685
4686 err = -EINVAL;
4687 memset(&fl6, 0, sizeof(fl6));
4688 rtm = nlmsg_data(nlh);
4689 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
4690 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
4691
4692 if (tb[RTA_SRC]) {
4693 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
4694 goto errout;
4695
4696 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
4697 }
4698
4699 if (tb[RTA_DST]) {
4700 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
4701 goto errout;
4702
4703 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
4704 }
4705
4706 if (tb[RTA_IIF])
4707 iif = nla_get_u32(tb[RTA_IIF]);
4708
4709 if (tb[RTA_OIF])
4710 oif = nla_get_u32(tb[RTA_OIF]);
4711
4712 if (tb[RTA_MARK])
4713 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
4714
4715 if (tb[RTA_UID])
4716 fl6.flowi6_uid = make_kuid(current_user_ns(),
4717 nla_get_u32(tb[RTA_UID]));
4718 else
4719 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
4720
4721 if (iif) {
4722 struct net_device *dev;
4723 int flags = 0;
4724
4725 rcu_read_lock();
4726
4727 dev = dev_get_by_index_rcu(net, iif);
4728 if (!dev) {
4729 rcu_read_unlock();
4730 err = -ENODEV;
4731 goto errout;
4732 }
4733
4734 fl6.flowi6_iif = iif;
4735
4736 if (!ipv6_addr_any(&fl6.saddr))
4737 flags |= RT6_LOOKUP_F_HAS_SADDR;
4738
4739 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
4740
4741 rcu_read_unlock();
4742 } else {
4743 fl6.flowi6_oif = oif;
4744
4745 dst = ip6_route_output(net, NULL, &fl6);
4746 }
4747
4748
4749 rt = container_of(dst, struct rt6_info, dst);
4750 if (rt->dst.error) {
4751 err = rt->dst.error;
4752 ip6_rt_put(rt);
4753 goto errout;
4754 }
4755
4756 if (rt == net->ipv6.ip6_null_entry) {
4757 err = rt->dst.error;
4758 ip6_rt_put(rt);
4759 goto errout;
4760 }
4761
4762 if (fibmatch && rt->from) {
4763 struct rt6_info *ort = rt->from;
4764
4765 dst_hold(&ort->dst);
4766 ip6_rt_put(rt);
4767 rt = ort;
4768 }
4769
4770 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
4771 if (!skb) {
4772 ip6_rt_put(rt);
4773 err = -ENOBUFS;
4774 goto errout;
4775 }
4776
4777 skb_dst_set(skb, &rt->dst);
4778 if (fibmatch)
4779 err = rt6_fill_node(net, skb, rt, NULL, NULL, iif,
4780 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
4781 nlh->nlmsg_seq, 0);
4782 else
4783 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
4784 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
4785 nlh->nlmsg_seq, 0);
4786 if (err < 0) {
4787 kfree_skb(skb);
4788 goto errout;
4789 }
4790
4791 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4792errout:
4793 return err;
4794}
4795
4796void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
4797 unsigned int nlm_flags)
4798{
4799 struct sk_buff *skb;
4800 struct net *net = info->nl_net;
4801 u32 seq;
4802 int err;
4803
4804 err = -ENOBUFS;
4805 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
4806
4807 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
4808 if (!skb)
4809 goto errout;
4810
4811 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
4812 event, info->portid, seq, nlm_flags);
4813 if (err < 0) {
4814 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
4815 WARN_ON(err == -EMSGSIZE);
4816 kfree_skb(skb);
4817 goto errout;
4818 }
4819 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
4820 info->nlh, gfp_any());
4821 return;
4822errout:
4823 if (err < 0)
4824 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
4825}
4826
4827static int ip6_route_dev_notify(struct notifier_block *this,
4828 unsigned long event, void *ptr)
4829{
4830 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
4831 struct net *net = dev_net(dev);
4832
4833 if (!(dev->flags & IFF_LOOPBACK))
4834 return NOTIFY_OK;
4835
4836 if (event == NETDEV_REGISTER) {
4837 net->ipv6.ip6_null_entry->dst.dev = dev;
4838 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
4839#ifdef CONFIG_IPV6_MULTIPLE_TABLES
4840 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
4841 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
4842 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
4843 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
4844#endif
4845 } else if (event == NETDEV_UNREGISTER &&
4846 dev->reg_state != NETREG_UNREGISTERED) {
4847 /* NETDEV_UNREGISTER could be fired for multiple times by
4848 * netdev_wait_allrefs(). Make sure we only call this once.
4849 */
4850 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
4851#ifdef CONFIG_IPV6_MULTIPLE_TABLES
4852 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
4853 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
4854#endif
4855 }
4856
4857 return NOTIFY_OK;
4858}
4859
4860/*
4861 * /proc
4862 */
4863
4864#ifdef CONFIG_PROC_FS
4865
4866static const struct file_operations ipv6_route_proc_fops = {
4867 .open = ipv6_route_open,
4868 .read = seq_read,
4869 .llseek = seq_lseek,
4870 .release = seq_release_net,
4871};
4872
4873static int rt6_stats_seq_show(struct seq_file *seq, void *v)
4874{
4875 struct net *net = (struct net *)seq->private;
4876 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
4877 net->ipv6.rt6_stats->fib_nodes,
4878 net->ipv6.rt6_stats->fib_route_nodes,
4879 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
4880 net->ipv6.rt6_stats->fib_rt_entries,
4881 net->ipv6.rt6_stats->fib_rt_cache,
4882 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
4883 net->ipv6.rt6_stats->fib_discarded_routes);
4884
4885 return 0;
4886}
4887
4888static int rt6_stats_seq_open(struct inode *inode, struct file *file)
4889{
4890 return single_open_net(inode, file, rt6_stats_seq_show);
4891}
4892
4893static const struct file_operations rt6_stats_seq_fops = {
4894 .open = rt6_stats_seq_open,
4895 .read = seq_read,
4896 .llseek = seq_lseek,
4897 .release = single_release_net,
4898};
4899#endif /* CONFIG_PROC_FS */
4900
4901#ifdef CONFIG_SYSCTL
4902
4903static
4904int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
4905 void __user *buffer, size_t *lenp, loff_t *ppos)
4906{
4907 struct net *net;
4908 int delay;
4909 if (!write)
4910 return -EINVAL;
4911
4912 net = (struct net *)ctl->extra1;
4913 delay = net->ipv6.sysctl.flush_delay;
4914 proc_dointvec(ctl, write, buffer, lenp, ppos);
4915 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
4916 return 0;
4917}
4918
4919struct ctl_table ipv6_route_table_template[] = {
4920 {
4921 .procname = "flush",
4922 .data = &init_net.ipv6.sysctl.flush_delay,
4923 .maxlen = sizeof(int),
4924 .mode = 0200,
4925 .proc_handler = ipv6_sysctl_rtcache_flush
4926 },
4927 {
4928 .procname = "gc_thresh",
4929 .data = &ip6_dst_ops_template.gc_thresh,
4930 .maxlen = sizeof(int),
4931 .mode = 0644,
4932 .proc_handler = proc_dointvec,
4933 },
4934 {
4935 .procname = "max_size",
4936 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
4937 .maxlen = sizeof(int),
4938 .mode = 0644,
4939 .proc_handler = proc_dointvec,
4940 },
4941 {
4942 .procname = "gc_min_interval",
4943 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
4944 .maxlen = sizeof(int),
4945 .mode = 0644,
4946 .proc_handler = proc_dointvec_jiffies,
4947 },
4948 {
4949 .procname = "gc_timeout",
4950 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
4951 .maxlen = sizeof(int),
4952 .mode = 0644,
4953 .proc_handler = proc_dointvec_jiffies,
4954 },
4955 {
4956 .procname = "gc_interval",
4957 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
4958 .maxlen = sizeof(int),
4959 .mode = 0644,
4960 .proc_handler = proc_dointvec_jiffies,
4961 },
4962 {
4963 .procname = "gc_elasticity",
4964 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
4965 .maxlen = sizeof(int),
4966 .mode = 0644,
4967 .proc_handler = proc_dointvec,
4968 },
4969 {
4970 .procname = "mtu_expires",
4971 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
4972 .maxlen = sizeof(int),
4973 .mode = 0644,
4974 .proc_handler = proc_dointvec_jiffies,
4975 },
4976 {
4977 .procname = "min_adv_mss",
4978 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
4979 .maxlen = sizeof(int),
4980 .mode = 0644,
4981 .proc_handler = proc_dointvec,
4982 },
4983 {
4984 .procname = "gc_min_interval_ms",
4985 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
4986 .maxlen = sizeof(int),
4987 .mode = 0644,
4988 .proc_handler = proc_dointvec_ms_jiffies,
4989 },
4990 { }
4991};
4992
4993struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
4994{
4995 struct ctl_table *table;
4996
4997 table = kmemdup(ipv6_route_table_template,
4998 sizeof(ipv6_route_table_template),
4999 GFP_KERNEL);
5000
5001 if (table) {
5002 table[0].data = &net->ipv6.sysctl.flush_delay;
5003 table[0].extra1 = net;
5004 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5005 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
5006 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
5007 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
5008 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
5009 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
5010 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
5011 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
5012 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
5013
5014 /* Don't export sysctls to unprivileged users */
5015 if (net->user_ns != &init_user_ns)
5016 table[0].procname = NULL;
5017 }
5018
5019 return table;
5020}
5021#endif
5022
5023static int __net_init ip6_route_net_init(struct net *net)
5024{
5025 int ret = -ENOMEM;
5026
5027 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
5028 sizeof(net->ipv6.ip6_dst_ops));
5029
5030 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
5031 goto out_ip6_dst_ops;
5032
5033 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
5034 sizeof(*net->ipv6.ip6_null_entry),
5035 GFP_KERNEL);
5036 if (!net->ipv6.ip6_null_entry)
5037 goto out_ip6_dst_entries;
5038 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
5039 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
5040 ip6_template_metrics, true);
5041
5042#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5043 net->ipv6.fib6_has_custom_rules = false;
5044 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
5045 sizeof(*net->ipv6.ip6_prohibit_entry),
5046 GFP_KERNEL);
5047 if (!net->ipv6.ip6_prohibit_entry)
5048 goto out_ip6_null_entry;
5049 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
5050 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
5051 ip6_template_metrics, true);
5052
5053 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
5054 sizeof(*net->ipv6.ip6_blk_hole_entry),
5055 GFP_KERNEL);
5056 if (!net->ipv6.ip6_blk_hole_entry)
5057 goto out_ip6_prohibit_entry;
5058 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
5059 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
5060 ip6_template_metrics, true);
5061#endif
5062
5063 net->ipv6.sysctl.flush_delay = 0;
5064 net->ipv6.sysctl.ip6_rt_max_size = 4096;
5065 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
5066 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
5067 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
5068 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
5069 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
5070 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
5071
5072 net->ipv6.ip6_rt_gc_expire = 30*HZ;
5073
5074 ret = 0;
5075out:
5076 return ret;
5077
5078#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5079out_ip6_prohibit_entry:
5080 kfree(net->ipv6.ip6_prohibit_entry);
5081out_ip6_null_entry:
5082 kfree(net->ipv6.ip6_null_entry);
5083#endif
5084out_ip6_dst_entries:
5085 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
5086out_ip6_dst_ops:
5087 goto out;
5088}
5089
5090static void __net_exit ip6_route_net_exit(struct net *net)
5091{
5092 kfree(net->ipv6.ip6_null_entry);
5093#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5094 kfree(net->ipv6.ip6_prohibit_entry);
5095 kfree(net->ipv6.ip6_blk_hole_entry);
5096#endif
5097 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
5098}
5099
5100static int __net_init ip6_route_net_init_late(struct net *net)
5101{
5102#ifdef CONFIG_PROC_FS
5103 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
5104 proc_create("rt6_stats", 0444, net->proc_net, &rt6_stats_seq_fops);
5105#endif
5106 return 0;
5107}
5108
5109static void __net_exit ip6_route_net_exit_late(struct net *net)
5110{
5111#ifdef CONFIG_PROC_FS
5112 remove_proc_entry("ipv6_route", net->proc_net);
5113 remove_proc_entry("rt6_stats", net->proc_net);
5114#endif
5115}
5116
5117static struct pernet_operations ip6_route_net_ops = {
5118 .init = ip6_route_net_init,
5119 .exit = ip6_route_net_exit,
5120};
5121
5122static int __net_init ipv6_inetpeer_init(struct net *net)
5123{
5124 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
5125
5126 if (!bp)
5127 return -ENOMEM;
5128 inet_peer_base_init(bp);
5129 net->ipv6.peers = bp;
5130 return 0;
5131}
5132
5133static void __net_exit ipv6_inetpeer_exit(struct net *net)
5134{
5135 struct inet_peer_base *bp = net->ipv6.peers;
5136
5137 net->ipv6.peers = NULL;
5138 inetpeer_invalidate_tree(bp);
5139 kfree(bp);
5140}
5141
5142static struct pernet_operations ipv6_inetpeer_ops = {
5143 .init = ipv6_inetpeer_init,
5144 .exit = ipv6_inetpeer_exit,
5145};
5146
5147static struct pernet_operations ip6_route_net_late_ops = {
5148 .init = ip6_route_net_init_late,
5149 .exit = ip6_route_net_exit_late,
5150};
5151
5152static struct notifier_block ip6_route_dev_notifier = {
5153 .notifier_call = ip6_route_dev_notify,
5154 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
5155};
5156
5157void __init ip6_route_init_special_entries(void)
5158{
5159 /* Registering of the loopback is done before this portion of code,
5160 * the loopback reference in rt6_info will not be taken, do it
5161 * manually for init_net */
5162 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
5163 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5164 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
5165 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
5166 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5167 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
5168 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5169 #endif
5170}
5171
5172int __init ip6_route_init(void)
5173{
5174 int ret;
5175 int cpu;
5176
5177 ret = -ENOMEM;
5178 ip6_dst_ops_template.kmem_cachep =
5179 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
5180 SLAB_HWCACHE_ALIGN, NULL);
5181 if (!ip6_dst_ops_template.kmem_cachep)
5182 goto out;
5183
5184 ret = dst_entries_init(&ip6_dst_blackhole_ops);
5185 if (ret)
5186 goto out_kmem_cache;
5187
5188 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
5189 if (ret)
5190 goto out_dst_entries;
5191
5192 ret = register_pernet_subsys(&ip6_route_net_ops);
5193 if (ret)
5194 goto out_register_inetpeer;
5195
5196 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
5197
5198 ret = fib6_init();
5199 if (ret)
5200 goto out_register_subsys;
5201
5202 ret = xfrm6_init();
5203 if (ret)
5204 goto out_fib6_init;
5205
5206 ret = fib6_rules_init();
5207 if (ret)
5208 goto xfrm6_init;
5209
5210 ret = register_pernet_subsys(&ip6_route_net_late_ops);
5211 if (ret)
5212 goto fib6_rules_init;
5213
5214 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
5215 inet6_rtm_newroute, NULL, 0);
5216 if (ret < 0)
5217 goto out_register_late_subsys;
5218
5219 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
5220 inet6_rtm_delroute, NULL, 0);
5221 if (ret < 0)
5222 goto out_register_late_subsys;
5223
5224 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
5225 inet6_rtm_getroute, NULL,
5226 RTNL_FLAG_DOIT_UNLOCKED);
5227 if (ret < 0)
5228 goto out_register_late_subsys;
5229
5230 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
5231 if (ret)
5232 goto out_register_late_subsys;
5233
5234 for_each_possible_cpu(cpu) {
5235 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
5236
5237 INIT_LIST_HEAD(&ul->head);
5238 spin_lock_init(&ul->lock);
5239 }
5240
5241out:
5242 return ret;
5243
5244out_register_late_subsys:
5245 rtnl_unregister_all(PF_INET6);
5246 unregister_pernet_subsys(&ip6_route_net_late_ops);
5247fib6_rules_init:
5248 fib6_rules_cleanup();
5249xfrm6_init:
5250 xfrm6_fini();
5251out_fib6_init:
5252 fib6_gc_cleanup();
5253out_register_subsys:
5254 unregister_pernet_subsys(&ip6_route_net_ops);
5255out_register_inetpeer:
5256 unregister_pernet_subsys(&ipv6_inetpeer_ops);
5257out_dst_entries:
5258 dst_entries_destroy(&ip6_dst_blackhole_ops);
5259out_kmem_cache:
5260 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
5261 goto out;
5262}
5263
5264void ip6_route_cleanup(void)
5265{
5266 unregister_netdevice_notifier(&ip6_route_dev_notifier);
5267 unregister_pernet_subsys(&ip6_route_net_late_ops);
5268 fib6_rules_cleanup();
5269 xfrm6_fini();
5270 fib6_gc_cleanup();
5271 unregister_pernet_subsys(&ipv6_inetpeer_ops);
5272 unregister_pernet_subsys(&ip6_route_net_ops);
5273 dst_entries_destroy(&ip6_dst_blackhole_ops);
5274 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
5275}
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/xfrm.h>
58#include <net/netevent.h>
59#include <net/netlink.h>
60
61#include <asm/uaccess.h>
62
63#ifdef CONFIG_SYSCTL
64#include <linux/sysctl.h>
65#endif
66
67static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
68 const struct in6_addr *dest);
69static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
70static unsigned int ip6_default_advmss(const struct dst_entry *dst);
71static unsigned int ip6_mtu(const struct dst_entry *dst);
72static struct dst_entry *ip6_negative_advice(struct dst_entry *);
73static void ip6_dst_destroy(struct dst_entry *);
74static void ip6_dst_ifdown(struct dst_entry *,
75 struct net_device *dev, int how);
76static int ip6_dst_gc(struct dst_ops *ops);
77
78static int ip6_pkt_discard(struct sk_buff *skb);
79static int ip6_pkt_discard_out(struct sk_buff *skb);
80static void ip6_link_failure(struct sk_buff *skb);
81static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
82
83#ifdef CONFIG_IPV6_ROUTE_INFO
84static struct rt6_info *rt6_add_route_info(struct net *net,
85 const struct in6_addr *prefix, int prefixlen,
86 const struct in6_addr *gwaddr, int ifindex,
87 unsigned int pref);
88static struct rt6_info *rt6_get_route_info(struct net *net,
89 const struct in6_addr *prefix, int prefixlen,
90 const struct in6_addr *gwaddr, int ifindex);
91#endif
92
93static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
94{
95 struct rt6_info *rt = (struct rt6_info *) dst;
96 struct inet_peer *peer;
97 u32 *p = NULL;
98
99 if (!(rt->dst.flags & DST_HOST))
100 return NULL;
101
102 if (!rt->rt6i_peer)
103 rt6_bind_peer(rt, 1);
104
105 peer = rt->rt6i_peer;
106 if (peer) {
107 u32 *old_p = __DST_METRICS_PTR(old);
108 unsigned long prev, new;
109
110 p = peer->metrics;
111 if (inet_metrics_new(peer))
112 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
113
114 new = (unsigned long) p;
115 prev = cmpxchg(&dst->_metrics, old, new);
116
117 if (prev != old) {
118 p = __DST_METRICS_PTR(prev);
119 if (prev & DST_METRICS_READ_ONLY)
120 p = NULL;
121 }
122 }
123 return p;
124}
125
126static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr)
127{
128 struct in6_addr *p = &rt->rt6i_gateway;
129
130 if (!ipv6_addr_any(p))
131 return (const void *) p;
132 return daddr;
133}
134
135static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr)
136{
137 struct rt6_info *rt = (struct rt6_info *) dst;
138 struct neighbour *n;
139
140 daddr = choose_neigh_daddr(rt, daddr);
141 n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr);
142 if (n)
143 return n;
144 return neigh_create(&nd_tbl, daddr, dst->dev);
145}
146
147static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
148{
149 struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway);
150 if (!n) {
151 n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev);
152 if (IS_ERR(n))
153 return PTR_ERR(n);
154 }
155 dst_set_neighbour(&rt->dst, n);
156
157 return 0;
158}
159
160static struct dst_ops ip6_dst_ops_template = {
161 .family = AF_INET6,
162 .protocol = cpu_to_be16(ETH_P_IPV6),
163 .gc = ip6_dst_gc,
164 .gc_thresh = 1024,
165 .check = ip6_dst_check,
166 .default_advmss = ip6_default_advmss,
167 .mtu = ip6_mtu,
168 .cow_metrics = ipv6_cow_metrics,
169 .destroy = ip6_dst_destroy,
170 .ifdown = ip6_dst_ifdown,
171 .negative_advice = ip6_negative_advice,
172 .link_failure = ip6_link_failure,
173 .update_pmtu = ip6_rt_update_pmtu,
174 .local_out = __ip6_local_out,
175 .neigh_lookup = ip6_neigh_lookup,
176};
177
178static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
179{
180 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
181
182 return mtu ? : dst->dev->mtu;
183}
184
185static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
186{
187}
188
189static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
190 unsigned long old)
191{
192 return NULL;
193}
194
195static struct dst_ops ip6_dst_blackhole_ops = {
196 .family = AF_INET6,
197 .protocol = cpu_to_be16(ETH_P_IPV6),
198 .destroy = ip6_dst_destroy,
199 .check = ip6_dst_check,
200 .mtu = ip6_blackhole_mtu,
201 .default_advmss = ip6_default_advmss,
202 .update_pmtu = ip6_rt_blackhole_update_pmtu,
203 .cow_metrics = ip6_rt_blackhole_cow_metrics,
204 .neigh_lookup = ip6_neigh_lookup,
205};
206
207static const u32 ip6_template_metrics[RTAX_MAX] = {
208 [RTAX_HOPLIMIT - 1] = 255,
209};
210
211static struct rt6_info ip6_null_entry_template = {
212 .dst = {
213 .__refcnt = ATOMIC_INIT(1),
214 .__use = 1,
215 .obsolete = -1,
216 .error = -ENETUNREACH,
217 .input = ip6_pkt_discard,
218 .output = ip6_pkt_discard_out,
219 },
220 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
221 .rt6i_protocol = RTPROT_KERNEL,
222 .rt6i_metric = ~(u32) 0,
223 .rt6i_ref = ATOMIC_INIT(1),
224};
225
226#ifdef CONFIG_IPV6_MULTIPLE_TABLES
227
228static int ip6_pkt_prohibit(struct sk_buff *skb);
229static int ip6_pkt_prohibit_out(struct sk_buff *skb);
230
231static struct rt6_info ip6_prohibit_entry_template = {
232 .dst = {
233 .__refcnt = ATOMIC_INIT(1),
234 .__use = 1,
235 .obsolete = -1,
236 .error = -EACCES,
237 .input = ip6_pkt_prohibit,
238 .output = ip6_pkt_prohibit_out,
239 },
240 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
241 .rt6i_protocol = RTPROT_KERNEL,
242 .rt6i_metric = ~(u32) 0,
243 .rt6i_ref = ATOMIC_INIT(1),
244};
245
246static struct rt6_info ip6_blk_hole_entry_template = {
247 .dst = {
248 .__refcnt = ATOMIC_INIT(1),
249 .__use = 1,
250 .obsolete = -1,
251 .error = -EINVAL,
252 .input = dst_discard,
253 .output = dst_discard,
254 },
255 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
256 .rt6i_protocol = RTPROT_KERNEL,
257 .rt6i_metric = ~(u32) 0,
258 .rt6i_ref = ATOMIC_INIT(1),
259};
260
261#endif
262
263/* allocate dst with ip6_dst_ops */
264static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops,
265 struct net_device *dev,
266 int flags)
267{
268 struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags);
269
270 if (rt)
271 memset(&rt->rt6i_table, 0,
272 sizeof(*rt) - sizeof(struct dst_entry));
273
274 return rt;
275}
276
277static void ip6_dst_destroy(struct dst_entry *dst)
278{
279 struct rt6_info *rt = (struct rt6_info *)dst;
280 struct inet6_dev *idev = rt->rt6i_idev;
281 struct inet_peer *peer = rt->rt6i_peer;
282
283 if (!(rt->dst.flags & DST_HOST))
284 dst_destroy_metrics_generic(dst);
285
286 if (idev) {
287 rt->rt6i_idev = NULL;
288 in6_dev_put(idev);
289 }
290
291 if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from)
292 dst_release(dst->from);
293
294 if (peer) {
295 rt->rt6i_peer = NULL;
296 inet_putpeer(peer);
297 }
298}
299
300static atomic_t __rt6_peer_genid = ATOMIC_INIT(0);
301
302static u32 rt6_peer_genid(void)
303{
304 return atomic_read(&__rt6_peer_genid);
305}
306
307void rt6_bind_peer(struct rt6_info *rt, int create)
308{
309 struct inet_peer *peer;
310
311 peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create);
312 if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL)
313 inet_putpeer(peer);
314 else
315 rt->rt6i_peer_genid = rt6_peer_genid();
316}
317
318static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
319 int how)
320{
321 struct rt6_info *rt = (struct rt6_info *)dst;
322 struct inet6_dev *idev = rt->rt6i_idev;
323 struct net_device *loopback_dev =
324 dev_net(dev)->loopback_dev;
325
326 if (dev != loopback_dev && idev && idev->dev == dev) {
327 struct inet6_dev *loopback_idev =
328 in6_dev_get(loopback_dev);
329 if (loopback_idev) {
330 rt->rt6i_idev = loopback_idev;
331 in6_dev_put(idev);
332 }
333 }
334}
335
336static bool rt6_check_expired(const struct rt6_info *rt)
337{
338 struct rt6_info *ort = NULL;
339
340 if (rt->rt6i_flags & RTF_EXPIRES) {
341 if (time_after(jiffies, rt->dst.expires))
342 return true;
343 } else if (rt->dst.from) {
344 ort = (struct rt6_info *) rt->dst.from;
345 return (ort->rt6i_flags & RTF_EXPIRES) &&
346 time_after(jiffies, ort->dst.expires);
347 }
348 return false;
349}
350
351static bool rt6_need_strict(const struct in6_addr *daddr)
352{
353 return ipv6_addr_type(daddr) &
354 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
355}
356
357/*
358 * Route lookup. Any table->tb6_lock is implied.
359 */
360
361static inline struct rt6_info *rt6_device_match(struct net *net,
362 struct rt6_info *rt,
363 const struct in6_addr *saddr,
364 int oif,
365 int flags)
366{
367 struct rt6_info *local = NULL;
368 struct rt6_info *sprt;
369
370 if (!oif && ipv6_addr_any(saddr))
371 goto out;
372
373 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
374 struct net_device *dev = sprt->dst.dev;
375
376 if (oif) {
377 if (dev->ifindex == oif)
378 return sprt;
379 if (dev->flags & IFF_LOOPBACK) {
380 if (!sprt->rt6i_idev ||
381 sprt->rt6i_idev->dev->ifindex != oif) {
382 if (flags & RT6_LOOKUP_F_IFACE && oif)
383 continue;
384 if (local && (!oif ||
385 local->rt6i_idev->dev->ifindex == oif))
386 continue;
387 }
388 local = sprt;
389 }
390 } else {
391 if (ipv6_chk_addr(net, saddr, dev,
392 flags & RT6_LOOKUP_F_IFACE))
393 return sprt;
394 }
395 }
396
397 if (oif) {
398 if (local)
399 return local;
400
401 if (flags & RT6_LOOKUP_F_IFACE)
402 return net->ipv6.ip6_null_entry;
403 }
404out:
405 return rt;
406}
407
408#ifdef CONFIG_IPV6_ROUTER_PREF
409static void rt6_probe(struct rt6_info *rt)
410{
411 struct neighbour *neigh;
412 /*
413 * Okay, this does not seem to be appropriate
414 * for now, however, we need to check if it
415 * is really so; aka Router Reachability Probing.
416 *
417 * Router Reachability Probe MUST be rate-limited
418 * to no more than one per minute.
419 */
420 rcu_read_lock();
421 neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL;
422 if (!neigh || (neigh->nud_state & NUD_VALID))
423 goto out;
424 read_lock_bh(&neigh->lock);
425 if (!(neigh->nud_state & NUD_VALID) &&
426 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
427 struct in6_addr mcaddr;
428 struct in6_addr *target;
429
430 neigh->updated = jiffies;
431 read_unlock_bh(&neigh->lock);
432
433 target = (struct in6_addr *)&neigh->primary_key;
434 addrconf_addr_solict_mult(target, &mcaddr);
435 ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL);
436 } else {
437 read_unlock_bh(&neigh->lock);
438 }
439out:
440 rcu_read_unlock();
441}
442#else
443static inline void rt6_probe(struct rt6_info *rt)
444{
445}
446#endif
447
448/*
449 * Default Router Selection (RFC 2461 6.3.6)
450 */
451static inline int rt6_check_dev(struct rt6_info *rt, int oif)
452{
453 struct net_device *dev = rt->dst.dev;
454 if (!oif || dev->ifindex == oif)
455 return 2;
456 if ((dev->flags & IFF_LOOPBACK) &&
457 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
458 return 1;
459 return 0;
460}
461
462static inline int rt6_check_neigh(struct rt6_info *rt)
463{
464 struct neighbour *neigh;
465 int m;
466
467 rcu_read_lock();
468 neigh = dst_get_neighbour_noref(&rt->dst);
469 if (rt->rt6i_flags & RTF_NONEXTHOP ||
470 !(rt->rt6i_flags & RTF_GATEWAY))
471 m = 1;
472 else if (neigh) {
473 read_lock_bh(&neigh->lock);
474 if (neigh->nud_state & NUD_VALID)
475 m = 2;
476#ifdef CONFIG_IPV6_ROUTER_PREF
477 else if (neigh->nud_state & NUD_FAILED)
478 m = 0;
479#endif
480 else
481 m = 1;
482 read_unlock_bh(&neigh->lock);
483 } else
484 m = 0;
485 rcu_read_unlock();
486 return m;
487}
488
489static int rt6_score_route(struct rt6_info *rt, int oif,
490 int strict)
491{
492 int m, n;
493
494 m = rt6_check_dev(rt, oif);
495 if (!m && (strict & RT6_LOOKUP_F_IFACE))
496 return -1;
497#ifdef CONFIG_IPV6_ROUTER_PREF
498 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
499#endif
500 n = rt6_check_neigh(rt);
501 if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
502 return -1;
503 return m;
504}
505
506static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
507 int *mpri, struct rt6_info *match)
508{
509 int m;
510
511 if (rt6_check_expired(rt))
512 goto out;
513
514 m = rt6_score_route(rt, oif, strict);
515 if (m < 0)
516 goto out;
517
518 if (m > *mpri) {
519 if (strict & RT6_LOOKUP_F_REACHABLE)
520 rt6_probe(match);
521 *mpri = m;
522 match = rt;
523 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
524 rt6_probe(rt);
525 }
526
527out:
528 return match;
529}
530
531static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
532 struct rt6_info *rr_head,
533 u32 metric, int oif, int strict)
534{
535 struct rt6_info *rt, *match;
536 int mpri = -1;
537
538 match = NULL;
539 for (rt = rr_head; rt && rt->rt6i_metric == metric;
540 rt = rt->dst.rt6_next)
541 match = find_match(rt, oif, strict, &mpri, match);
542 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
543 rt = rt->dst.rt6_next)
544 match = find_match(rt, oif, strict, &mpri, match);
545
546 return match;
547}
548
549static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
550{
551 struct rt6_info *match, *rt0;
552 struct net *net;
553
554 rt0 = fn->rr_ptr;
555 if (!rt0)
556 fn->rr_ptr = rt0 = fn->leaf;
557
558 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
559
560 if (!match &&
561 (strict & RT6_LOOKUP_F_REACHABLE)) {
562 struct rt6_info *next = rt0->dst.rt6_next;
563
564 /* no entries matched; do round-robin */
565 if (!next || next->rt6i_metric != rt0->rt6i_metric)
566 next = fn->leaf;
567
568 if (next != rt0)
569 fn->rr_ptr = next;
570 }
571
572 net = dev_net(rt0->dst.dev);
573 return match ? match : net->ipv6.ip6_null_entry;
574}
575
576#ifdef CONFIG_IPV6_ROUTE_INFO
577int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
578 const struct in6_addr *gwaddr)
579{
580 struct net *net = dev_net(dev);
581 struct route_info *rinfo = (struct route_info *) opt;
582 struct in6_addr prefix_buf, *prefix;
583 unsigned int pref;
584 unsigned long lifetime;
585 struct rt6_info *rt;
586
587 if (len < sizeof(struct route_info)) {
588 return -EINVAL;
589 }
590
591 /* Sanity check for prefix_len and length */
592 if (rinfo->length > 3) {
593 return -EINVAL;
594 } else if (rinfo->prefix_len > 128) {
595 return -EINVAL;
596 } else if (rinfo->prefix_len > 64) {
597 if (rinfo->length < 2) {
598 return -EINVAL;
599 }
600 } else if (rinfo->prefix_len > 0) {
601 if (rinfo->length < 1) {
602 return -EINVAL;
603 }
604 }
605
606 pref = rinfo->route_pref;
607 if (pref == ICMPV6_ROUTER_PREF_INVALID)
608 return -EINVAL;
609
610 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
611
612 if (rinfo->length == 3)
613 prefix = (struct in6_addr *)rinfo->prefix;
614 else {
615 /* this function is safe */
616 ipv6_addr_prefix(&prefix_buf,
617 (struct in6_addr *)rinfo->prefix,
618 rinfo->prefix_len);
619 prefix = &prefix_buf;
620 }
621
622 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
623 dev->ifindex);
624
625 if (rt && !lifetime) {
626 ip6_del_rt(rt);
627 rt = NULL;
628 }
629
630 if (!rt && lifetime)
631 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
632 pref);
633 else if (rt)
634 rt->rt6i_flags = RTF_ROUTEINFO |
635 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
636
637 if (rt) {
638 if (!addrconf_finite_timeout(lifetime))
639 rt6_clean_expires(rt);
640 else
641 rt6_set_expires(rt, jiffies + HZ * lifetime);
642
643 dst_release(&rt->dst);
644 }
645 return 0;
646}
647#endif
648
649#define BACKTRACK(__net, saddr) \
650do { \
651 if (rt == __net->ipv6.ip6_null_entry) { \
652 struct fib6_node *pn; \
653 while (1) { \
654 if (fn->fn_flags & RTN_TL_ROOT) \
655 goto out; \
656 pn = fn->parent; \
657 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
658 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
659 else \
660 fn = pn; \
661 if (fn->fn_flags & RTN_RTINFO) \
662 goto restart; \
663 } \
664 } \
665} while (0)
666
667static struct rt6_info *ip6_pol_route_lookup(struct net *net,
668 struct fib6_table *table,
669 struct flowi6 *fl6, int flags)
670{
671 struct fib6_node *fn;
672 struct rt6_info *rt;
673
674 read_lock_bh(&table->tb6_lock);
675 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
676restart:
677 rt = fn->leaf;
678 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
679 BACKTRACK(net, &fl6->saddr);
680out:
681 dst_use(&rt->dst, jiffies);
682 read_unlock_bh(&table->tb6_lock);
683 return rt;
684
685}
686
687struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
688 int flags)
689{
690 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
691}
692EXPORT_SYMBOL_GPL(ip6_route_lookup);
693
694struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
695 const struct in6_addr *saddr, int oif, int strict)
696{
697 struct flowi6 fl6 = {
698 .flowi6_oif = oif,
699 .daddr = *daddr,
700 };
701 struct dst_entry *dst;
702 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
703
704 if (saddr) {
705 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
706 flags |= RT6_LOOKUP_F_HAS_SADDR;
707 }
708
709 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
710 if (dst->error == 0)
711 return (struct rt6_info *) dst;
712
713 dst_release(dst);
714
715 return NULL;
716}
717
718EXPORT_SYMBOL(rt6_lookup);
719
720/* ip6_ins_rt is called with FREE table->tb6_lock.
721 It takes new route entry, the addition fails by any reason the
722 route is freed. In any case, if caller does not hold it, it may
723 be destroyed.
724 */
725
726static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
727{
728 int err;
729 struct fib6_table *table;
730
731 table = rt->rt6i_table;
732 write_lock_bh(&table->tb6_lock);
733 err = fib6_add(&table->tb6_root, rt, info);
734 write_unlock_bh(&table->tb6_lock);
735
736 return err;
737}
738
739int ip6_ins_rt(struct rt6_info *rt)
740{
741 struct nl_info info = {
742 .nl_net = dev_net(rt->dst.dev),
743 };
744 return __ip6_ins_rt(rt, &info);
745}
746
747static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
748 const struct in6_addr *daddr,
749 const struct in6_addr *saddr)
750{
751 struct rt6_info *rt;
752
753 /*
754 * Clone the route.
755 */
756
757 rt = ip6_rt_copy(ort, daddr);
758
759 if (rt) {
760 int attempts = !in_softirq();
761
762 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
763 if (ort->rt6i_dst.plen != 128 &&
764 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
765 rt->rt6i_flags |= RTF_ANYCAST;
766 rt->rt6i_gateway = *daddr;
767 }
768
769 rt->rt6i_flags |= RTF_CACHE;
770
771#ifdef CONFIG_IPV6_SUBTREES
772 if (rt->rt6i_src.plen && saddr) {
773 rt->rt6i_src.addr = *saddr;
774 rt->rt6i_src.plen = 128;
775 }
776#endif
777
778 retry:
779 if (rt6_bind_neighbour(rt, rt->dst.dev)) {
780 struct net *net = dev_net(rt->dst.dev);
781 int saved_rt_min_interval =
782 net->ipv6.sysctl.ip6_rt_gc_min_interval;
783 int saved_rt_elasticity =
784 net->ipv6.sysctl.ip6_rt_gc_elasticity;
785
786 if (attempts-- > 0) {
787 net->ipv6.sysctl.ip6_rt_gc_elasticity = 1;
788 net->ipv6.sysctl.ip6_rt_gc_min_interval = 0;
789
790 ip6_dst_gc(&net->ipv6.ip6_dst_ops);
791
792 net->ipv6.sysctl.ip6_rt_gc_elasticity =
793 saved_rt_elasticity;
794 net->ipv6.sysctl.ip6_rt_gc_min_interval =
795 saved_rt_min_interval;
796 goto retry;
797 }
798
799 net_warn_ratelimited("Neighbour table overflow\n");
800 dst_free(&rt->dst);
801 return NULL;
802 }
803 }
804
805 return rt;
806}
807
808static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
809 const struct in6_addr *daddr)
810{
811 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
812
813 if (rt) {
814 rt->rt6i_flags |= RTF_CACHE;
815 dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst)));
816 }
817 return rt;
818}
819
820static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
821 struct flowi6 *fl6, int flags)
822{
823 struct fib6_node *fn;
824 struct rt6_info *rt, *nrt;
825 int strict = 0;
826 int attempts = 3;
827 int err;
828 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
829
830 strict |= flags & RT6_LOOKUP_F_IFACE;
831
832relookup:
833 read_lock_bh(&table->tb6_lock);
834
835restart_2:
836 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
837
838restart:
839 rt = rt6_select(fn, oif, strict | reachable);
840
841 BACKTRACK(net, &fl6->saddr);
842 if (rt == net->ipv6.ip6_null_entry ||
843 rt->rt6i_flags & RTF_CACHE)
844 goto out;
845
846 dst_hold(&rt->dst);
847 read_unlock_bh(&table->tb6_lock);
848
849 if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
850 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
851 else if (!(rt->dst.flags & DST_HOST))
852 nrt = rt6_alloc_clone(rt, &fl6->daddr);
853 else
854 goto out2;
855
856 dst_release(&rt->dst);
857 rt = nrt ? : net->ipv6.ip6_null_entry;
858
859 dst_hold(&rt->dst);
860 if (nrt) {
861 err = ip6_ins_rt(nrt);
862 if (!err)
863 goto out2;
864 }
865
866 if (--attempts <= 0)
867 goto out2;
868
869 /*
870 * Race condition! In the gap, when table->tb6_lock was
871 * released someone could insert this route. Relookup.
872 */
873 dst_release(&rt->dst);
874 goto relookup;
875
876out:
877 if (reachable) {
878 reachable = 0;
879 goto restart_2;
880 }
881 dst_hold(&rt->dst);
882 read_unlock_bh(&table->tb6_lock);
883out2:
884 rt->dst.lastuse = jiffies;
885 rt->dst.__use++;
886
887 return rt;
888}
889
890static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
891 struct flowi6 *fl6, int flags)
892{
893 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
894}
895
896static struct dst_entry *ip6_route_input_lookup(struct net *net,
897 struct net_device *dev,
898 struct flowi6 *fl6, int flags)
899{
900 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
901 flags |= RT6_LOOKUP_F_IFACE;
902
903 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
904}
905
906void ip6_route_input(struct sk_buff *skb)
907{
908 const struct ipv6hdr *iph = ipv6_hdr(skb);
909 struct net *net = dev_net(skb->dev);
910 int flags = RT6_LOOKUP_F_HAS_SADDR;
911 struct flowi6 fl6 = {
912 .flowi6_iif = skb->dev->ifindex,
913 .daddr = iph->daddr,
914 .saddr = iph->saddr,
915 .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK,
916 .flowi6_mark = skb->mark,
917 .flowi6_proto = iph->nexthdr,
918 };
919
920 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
921}
922
923static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
924 struct flowi6 *fl6, int flags)
925{
926 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
927}
928
929struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
930 struct flowi6 *fl6)
931{
932 int flags = 0;
933
934 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
935 flags |= RT6_LOOKUP_F_IFACE;
936
937 if (!ipv6_addr_any(&fl6->saddr))
938 flags |= RT6_LOOKUP_F_HAS_SADDR;
939 else if (sk)
940 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
941
942 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
943}
944
945EXPORT_SYMBOL(ip6_route_output);
946
947struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
948{
949 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
950 struct dst_entry *new = NULL;
951
952 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0);
953 if (rt) {
954 memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry));
955
956 new = &rt->dst;
957
958 new->__use = 1;
959 new->input = dst_discard;
960 new->output = dst_discard;
961
962 if (dst_metrics_read_only(&ort->dst))
963 new->_metrics = ort->dst._metrics;
964 else
965 dst_copy_metrics(new, &ort->dst);
966 rt->rt6i_idev = ort->rt6i_idev;
967 if (rt->rt6i_idev)
968 in6_dev_hold(rt->rt6i_idev);
969
970 rt->rt6i_gateway = ort->rt6i_gateway;
971 rt->rt6i_flags = ort->rt6i_flags;
972 rt6_clean_expires(rt);
973 rt->rt6i_metric = 0;
974
975 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
976#ifdef CONFIG_IPV6_SUBTREES
977 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
978#endif
979
980 dst_free(new);
981 }
982
983 dst_release(dst_orig);
984 return new ? new : ERR_PTR(-ENOMEM);
985}
986
987/*
988 * Destination cache support functions
989 */
990
991static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
992{
993 struct rt6_info *rt;
994
995 rt = (struct rt6_info *) dst;
996
997 if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) {
998 if (rt->rt6i_peer_genid != rt6_peer_genid()) {
999 if (!rt->rt6i_peer)
1000 rt6_bind_peer(rt, 0);
1001 rt->rt6i_peer_genid = rt6_peer_genid();
1002 }
1003 return dst;
1004 }
1005 return NULL;
1006}
1007
1008static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1009{
1010 struct rt6_info *rt = (struct rt6_info *) dst;
1011
1012 if (rt) {
1013 if (rt->rt6i_flags & RTF_CACHE) {
1014 if (rt6_check_expired(rt)) {
1015 ip6_del_rt(rt);
1016 dst = NULL;
1017 }
1018 } else {
1019 dst_release(dst);
1020 dst = NULL;
1021 }
1022 }
1023 return dst;
1024}
1025
1026static void ip6_link_failure(struct sk_buff *skb)
1027{
1028 struct rt6_info *rt;
1029
1030 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1031
1032 rt = (struct rt6_info *) skb_dst(skb);
1033 if (rt) {
1034 if (rt->rt6i_flags & RTF_CACHE)
1035 rt6_update_expires(rt, 0);
1036 else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
1037 rt->rt6i_node->fn_sernum = -1;
1038 }
1039}
1040
1041static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
1042{
1043 struct rt6_info *rt6 = (struct rt6_info*)dst;
1044
1045 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1046 rt6->rt6i_flags |= RTF_MODIFIED;
1047 if (mtu < IPV6_MIN_MTU) {
1048 u32 features = dst_metric(dst, RTAX_FEATURES);
1049 mtu = IPV6_MIN_MTU;
1050 features |= RTAX_FEATURE_ALLFRAG;
1051 dst_metric_set(dst, RTAX_FEATURES, features);
1052 }
1053 dst_metric_set(dst, RTAX_MTU, mtu);
1054 }
1055}
1056
1057static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1058{
1059 struct net_device *dev = dst->dev;
1060 unsigned int mtu = dst_mtu(dst);
1061 struct net *net = dev_net(dev);
1062
1063 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1064
1065 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1066 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1067
1068 /*
1069 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1070 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1071 * IPV6_MAXPLEN is also valid and means: "any MSS,
1072 * rely only on pmtu discovery"
1073 */
1074 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1075 mtu = IPV6_MAXPLEN;
1076 return mtu;
1077}
1078
1079static unsigned int ip6_mtu(const struct dst_entry *dst)
1080{
1081 struct inet6_dev *idev;
1082 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1083
1084 if (mtu)
1085 return mtu;
1086
1087 mtu = IPV6_MIN_MTU;
1088
1089 rcu_read_lock();
1090 idev = __in6_dev_get(dst->dev);
1091 if (idev)
1092 mtu = idev->cnf.mtu6;
1093 rcu_read_unlock();
1094
1095 return mtu;
1096}
1097
1098static struct dst_entry *icmp6_dst_gc_list;
1099static DEFINE_SPINLOCK(icmp6_dst_lock);
1100
1101struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1102 struct neighbour *neigh,
1103 struct flowi6 *fl6)
1104{
1105 struct dst_entry *dst;
1106 struct rt6_info *rt;
1107 struct inet6_dev *idev = in6_dev_get(dev);
1108 struct net *net = dev_net(dev);
1109
1110 if (unlikely(!idev))
1111 return ERR_PTR(-ENODEV);
1112
1113 rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0);
1114 if (unlikely(!rt)) {
1115 in6_dev_put(idev);
1116 dst = ERR_PTR(-ENOMEM);
1117 goto out;
1118 }
1119
1120 if (neigh)
1121 neigh_hold(neigh);
1122 else {
1123 neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr);
1124 if (IS_ERR(neigh)) {
1125 in6_dev_put(idev);
1126 dst_free(&rt->dst);
1127 return ERR_CAST(neigh);
1128 }
1129 }
1130
1131 rt->dst.flags |= DST_HOST;
1132 rt->dst.output = ip6_output;
1133 dst_set_neighbour(&rt->dst, neigh);
1134 atomic_set(&rt->dst.__refcnt, 1);
1135 rt->rt6i_dst.addr = fl6->daddr;
1136 rt->rt6i_dst.plen = 128;
1137 rt->rt6i_idev = idev;
1138 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255);
1139
1140 spin_lock_bh(&icmp6_dst_lock);
1141 rt->dst.next = icmp6_dst_gc_list;
1142 icmp6_dst_gc_list = &rt->dst;
1143 spin_unlock_bh(&icmp6_dst_lock);
1144
1145 fib6_force_start_gc(net);
1146
1147 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1148
1149out:
1150 return dst;
1151}
1152
1153int icmp6_dst_gc(void)
1154{
1155 struct dst_entry *dst, **pprev;
1156 int more = 0;
1157
1158 spin_lock_bh(&icmp6_dst_lock);
1159 pprev = &icmp6_dst_gc_list;
1160
1161 while ((dst = *pprev) != NULL) {
1162 if (!atomic_read(&dst->__refcnt)) {
1163 *pprev = dst->next;
1164 dst_free(dst);
1165 } else {
1166 pprev = &dst->next;
1167 ++more;
1168 }
1169 }
1170
1171 spin_unlock_bh(&icmp6_dst_lock);
1172
1173 return more;
1174}
1175
1176static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1177 void *arg)
1178{
1179 struct dst_entry *dst, **pprev;
1180
1181 spin_lock_bh(&icmp6_dst_lock);
1182 pprev = &icmp6_dst_gc_list;
1183 while ((dst = *pprev) != NULL) {
1184 struct rt6_info *rt = (struct rt6_info *) dst;
1185 if (func(rt, arg)) {
1186 *pprev = dst->next;
1187 dst_free(dst);
1188 } else {
1189 pprev = &dst->next;
1190 }
1191 }
1192 spin_unlock_bh(&icmp6_dst_lock);
1193}
1194
1195static int ip6_dst_gc(struct dst_ops *ops)
1196{
1197 unsigned long now = jiffies;
1198 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1199 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1200 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1201 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1202 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1203 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1204 int entries;
1205
1206 entries = dst_entries_get_fast(ops);
1207 if (time_after(rt_last_gc + rt_min_interval, now) &&
1208 entries <= rt_max_size)
1209 goto out;
1210
1211 net->ipv6.ip6_rt_gc_expire++;
1212 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1213 net->ipv6.ip6_rt_last_gc = now;
1214 entries = dst_entries_get_slow(ops);
1215 if (entries < ops->gc_thresh)
1216 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1217out:
1218 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1219 return entries > rt_max_size;
1220}
1221
1222/* Clean host part of a prefix. Not necessary in radix tree,
1223 but results in cleaner routing tables.
1224
1225 Remove it only when all the things will work!
1226 */
1227
1228int ip6_dst_hoplimit(struct dst_entry *dst)
1229{
1230 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1231 if (hoplimit == 0) {
1232 struct net_device *dev = dst->dev;
1233 struct inet6_dev *idev;
1234
1235 rcu_read_lock();
1236 idev = __in6_dev_get(dev);
1237 if (idev)
1238 hoplimit = idev->cnf.hop_limit;
1239 else
1240 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1241 rcu_read_unlock();
1242 }
1243 return hoplimit;
1244}
1245EXPORT_SYMBOL(ip6_dst_hoplimit);
1246
1247/*
1248 *
1249 */
1250
1251int ip6_route_add(struct fib6_config *cfg)
1252{
1253 int err;
1254 struct net *net = cfg->fc_nlinfo.nl_net;
1255 struct rt6_info *rt = NULL;
1256 struct net_device *dev = NULL;
1257 struct inet6_dev *idev = NULL;
1258 struct fib6_table *table;
1259 int addr_type;
1260
1261 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1262 return -EINVAL;
1263#ifndef CONFIG_IPV6_SUBTREES
1264 if (cfg->fc_src_len)
1265 return -EINVAL;
1266#endif
1267 if (cfg->fc_ifindex) {
1268 err = -ENODEV;
1269 dev = dev_get_by_index(net, cfg->fc_ifindex);
1270 if (!dev)
1271 goto out;
1272 idev = in6_dev_get(dev);
1273 if (!idev)
1274 goto out;
1275 }
1276
1277 if (cfg->fc_metric == 0)
1278 cfg->fc_metric = IP6_RT_PRIO_USER;
1279
1280 err = -ENOBUFS;
1281 if (cfg->fc_nlinfo.nlh &&
1282 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1283 table = fib6_get_table(net, cfg->fc_table);
1284 if (!table) {
1285 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1286 table = fib6_new_table(net, cfg->fc_table);
1287 }
1288 } else {
1289 table = fib6_new_table(net, cfg->fc_table);
1290 }
1291
1292 if (!table)
1293 goto out;
1294
1295 rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT);
1296
1297 if (!rt) {
1298 err = -ENOMEM;
1299 goto out;
1300 }
1301
1302 rt->dst.obsolete = -1;
1303
1304 if (cfg->fc_flags & RTF_EXPIRES)
1305 rt6_set_expires(rt, jiffies +
1306 clock_t_to_jiffies(cfg->fc_expires));
1307 else
1308 rt6_clean_expires(rt);
1309
1310 if (cfg->fc_protocol == RTPROT_UNSPEC)
1311 cfg->fc_protocol = RTPROT_BOOT;
1312 rt->rt6i_protocol = cfg->fc_protocol;
1313
1314 addr_type = ipv6_addr_type(&cfg->fc_dst);
1315
1316 if (addr_type & IPV6_ADDR_MULTICAST)
1317 rt->dst.input = ip6_mc_input;
1318 else if (cfg->fc_flags & RTF_LOCAL)
1319 rt->dst.input = ip6_input;
1320 else
1321 rt->dst.input = ip6_forward;
1322
1323 rt->dst.output = ip6_output;
1324
1325 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1326 rt->rt6i_dst.plen = cfg->fc_dst_len;
1327 if (rt->rt6i_dst.plen == 128)
1328 rt->dst.flags |= DST_HOST;
1329
1330 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1331 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1332 if (!metrics) {
1333 err = -ENOMEM;
1334 goto out;
1335 }
1336 dst_init_metrics(&rt->dst, metrics, 0);
1337 }
1338#ifdef CONFIG_IPV6_SUBTREES
1339 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1340 rt->rt6i_src.plen = cfg->fc_src_len;
1341#endif
1342
1343 rt->rt6i_metric = cfg->fc_metric;
1344
1345 /* We cannot add true routes via loopback here,
1346 they would result in kernel looping; promote them to reject routes
1347 */
1348 if ((cfg->fc_flags & RTF_REJECT) ||
1349 (dev && (dev->flags & IFF_LOOPBACK) &&
1350 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1351 !(cfg->fc_flags & RTF_LOCAL))) {
1352 /* hold loopback dev/idev if we haven't done so. */
1353 if (dev != net->loopback_dev) {
1354 if (dev) {
1355 dev_put(dev);
1356 in6_dev_put(idev);
1357 }
1358 dev = net->loopback_dev;
1359 dev_hold(dev);
1360 idev = in6_dev_get(dev);
1361 if (!idev) {
1362 err = -ENODEV;
1363 goto out;
1364 }
1365 }
1366 rt->dst.output = ip6_pkt_discard_out;
1367 rt->dst.input = ip6_pkt_discard;
1368 rt->dst.error = -ENETUNREACH;
1369 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1370 goto install_route;
1371 }
1372
1373 if (cfg->fc_flags & RTF_GATEWAY) {
1374 const struct in6_addr *gw_addr;
1375 int gwa_type;
1376
1377 gw_addr = &cfg->fc_gateway;
1378 rt->rt6i_gateway = *gw_addr;
1379 gwa_type = ipv6_addr_type(gw_addr);
1380
1381 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1382 struct rt6_info *grt;
1383
1384 /* IPv6 strictly inhibits using not link-local
1385 addresses as nexthop address.
1386 Otherwise, router will not able to send redirects.
1387 It is very good, but in some (rare!) circumstances
1388 (SIT, PtP, NBMA NOARP links) it is handy to allow
1389 some exceptions. --ANK
1390 */
1391 err = -EINVAL;
1392 if (!(gwa_type & IPV6_ADDR_UNICAST))
1393 goto out;
1394
1395 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1396
1397 err = -EHOSTUNREACH;
1398 if (!grt)
1399 goto out;
1400 if (dev) {
1401 if (dev != grt->dst.dev) {
1402 dst_release(&grt->dst);
1403 goto out;
1404 }
1405 } else {
1406 dev = grt->dst.dev;
1407 idev = grt->rt6i_idev;
1408 dev_hold(dev);
1409 in6_dev_hold(grt->rt6i_idev);
1410 }
1411 if (!(grt->rt6i_flags & RTF_GATEWAY))
1412 err = 0;
1413 dst_release(&grt->dst);
1414
1415 if (err)
1416 goto out;
1417 }
1418 err = -EINVAL;
1419 if (!dev || (dev->flags & IFF_LOOPBACK))
1420 goto out;
1421 }
1422
1423 err = -ENODEV;
1424 if (!dev)
1425 goto out;
1426
1427 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1428 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1429 err = -EINVAL;
1430 goto out;
1431 }
1432 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1433 rt->rt6i_prefsrc.plen = 128;
1434 } else
1435 rt->rt6i_prefsrc.plen = 0;
1436
1437 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1438 err = rt6_bind_neighbour(rt, dev);
1439 if (err)
1440 goto out;
1441 }
1442
1443 rt->rt6i_flags = cfg->fc_flags;
1444
1445install_route:
1446 if (cfg->fc_mx) {
1447 struct nlattr *nla;
1448 int remaining;
1449
1450 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1451 int type = nla_type(nla);
1452
1453 if (type) {
1454 if (type > RTAX_MAX) {
1455 err = -EINVAL;
1456 goto out;
1457 }
1458
1459 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1460 }
1461 }
1462 }
1463
1464 rt->dst.dev = dev;
1465 rt->rt6i_idev = idev;
1466 rt->rt6i_table = table;
1467
1468 cfg->fc_nlinfo.nl_net = dev_net(dev);
1469
1470 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1471
1472out:
1473 if (dev)
1474 dev_put(dev);
1475 if (idev)
1476 in6_dev_put(idev);
1477 if (rt)
1478 dst_free(&rt->dst);
1479 return err;
1480}
1481
1482static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1483{
1484 int err;
1485 struct fib6_table *table;
1486 struct net *net = dev_net(rt->dst.dev);
1487
1488 if (rt == net->ipv6.ip6_null_entry)
1489 return -ENOENT;
1490
1491 table = rt->rt6i_table;
1492 write_lock_bh(&table->tb6_lock);
1493
1494 err = fib6_del(rt, info);
1495 dst_release(&rt->dst);
1496
1497 write_unlock_bh(&table->tb6_lock);
1498
1499 return err;
1500}
1501
1502int ip6_del_rt(struct rt6_info *rt)
1503{
1504 struct nl_info info = {
1505 .nl_net = dev_net(rt->dst.dev),
1506 };
1507 return __ip6_del_rt(rt, &info);
1508}
1509
1510static int ip6_route_del(struct fib6_config *cfg)
1511{
1512 struct fib6_table *table;
1513 struct fib6_node *fn;
1514 struct rt6_info *rt;
1515 int err = -ESRCH;
1516
1517 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1518 if (!table)
1519 return err;
1520
1521 read_lock_bh(&table->tb6_lock);
1522
1523 fn = fib6_locate(&table->tb6_root,
1524 &cfg->fc_dst, cfg->fc_dst_len,
1525 &cfg->fc_src, cfg->fc_src_len);
1526
1527 if (fn) {
1528 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1529 if (cfg->fc_ifindex &&
1530 (!rt->dst.dev ||
1531 rt->dst.dev->ifindex != cfg->fc_ifindex))
1532 continue;
1533 if (cfg->fc_flags & RTF_GATEWAY &&
1534 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1535 continue;
1536 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1537 continue;
1538 dst_hold(&rt->dst);
1539 read_unlock_bh(&table->tb6_lock);
1540
1541 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1542 }
1543 }
1544 read_unlock_bh(&table->tb6_lock);
1545
1546 return err;
1547}
1548
1549/*
1550 * Handle redirects
1551 */
1552struct ip6rd_flowi {
1553 struct flowi6 fl6;
1554 struct in6_addr gateway;
1555};
1556
1557static struct rt6_info *__ip6_route_redirect(struct net *net,
1558 struct fib6_table *table,
1559 struct flowi6 *fl6,
1560 int flags)
1561{
1562 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1563 struct rt6_info *rt;
1564 struct fib6_node *fn;
1565
1566 /*
1567 * Get the "current" route for this destination and
1568 * check if the redirect has come from approriate router.
1569 *
1570 * RFC 2461 specifies that redirects should only be
1571 * accepted if they come from the nexthop to the target.
1572 * Due to the way the routes are chosen, this notion
1573 * is a bit fuzzy and one might need to check all possible
1574 * routes.
1575 */
1576
1577 read_lock_bh(&table->tb6_lock);
1578 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1579restart:
1580 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1581 /*
1582 * Current route is on-link; redirect is always invalid.
1583 *
1584 * Seems, previous statement is not true. It could
1585 * be node, which looks for us as on-link (f.e. proxy ndisc)
1586 * But then router serving it might decide, that we should
1587 * know truth 8)8) --ANK (980726).
1588 */
1589 if (rt6_check_expired(rt))
1590 continue;
1591 if (!(rt->rt6i_flags & RTF_GATEWAY))
1592 continue;
1593 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1594 continue;
1595 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1596 continue;
1597 break;
1598 }
1599
1600 if (!rt)
1601 rt = net->ipv6.ip6_null_entry;
1602 BACKTRACK(net, &fl6->saddr);
1603out:
1604 dst_hold(&rt->dst);
1605
1606 read_unlock_bh(&table->tb6_lock);
1607
1608 return rt;
1609};
1610
1611static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest,
1612 const struct in6_addr *src,
1613 const struct in6_addr *gateway,
1614 struct net_device *dev)
1615{
1616 int flags = RT6_LOOKUP_F_HAS_SADDR;
1617 struct net *net = dev_net(dev);
1618 struct ip6rd_flowi rdfl = {
1619 .fl6 = {
1620 .flowi6_oif = dev->ifindex,
1621 .daddr = *dest,
1622 .saddr = *src,
1623 },
1624 };
1625
1626 rdfl.gateway = *gateway;
1627
1628 if (rt6_need_strict(dest))
1629 flags |= RT6_LOOKUP_F_IFACE;
1630
1631 return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6,
1632 flags, __ip6_route_redirect);
1633}
1634
1635void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src,
1636 const struct in6_addr *saddr,
1637 struct neighbour *neigh, u8 *lladdr, int on_link)
1638{
1639 struct rt6_info *rt, *nrt = NULL;
1640 struct netevent_redirect netevent;
1641 struct net *net = dev_net(neigh->dev);
1642
1643 rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
1644
1645 if (rt == net->ipv6.ip6_null_entry) {
1646 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1647 goto out;
1648 }
1649
1650 /*
1651 * We have finally decided to accept it.
1652 */
1653
1654 neigh_update(neigh, lladdr, NUD_STALE,
1655 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1656 NEIGH_UPDATE_F_OVERRIDE|
1657 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1658 NEIGH_UPDATE_F_ISROUTER))
1659 );
1660
1661 /*
1662 * Redirect received -> path was valid.
1663 * Look, redirects are sent only in response to data packets,
1664 * so that this nexthop apparently is reachable. --ANK
1665 */
1666 dst_confirm(&rt->dst);
1667
1668 /* Duplicate redirect: silently ignore. */
1669 if (neigh == dst_get_neighbour_noref_raw(&rt->dst))
1670 goto out;
1671
1672 nrt = ip6_rt_copy(rt, dest);
1673 if (!nrt)
1674 goto out;
1675
1676 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1677 if (on_link)
1678 nrt->rt6i_flags &= ~RTF_GATEWAY;
1679
1680 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1681 dst_set_neighbour(&nrt->dst, neigh_clone(neigh));
1682
1683 if (ip6_ins_rt(nrt))
1684 goto out;
1685
1686 netevent.old = &rt->dst;
1687 netevent.new = &nrt->dst;
1688 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1689
1690 if (rt->rt6i_flags & RTF_CACHE) {
1691 ip6_del_rt(rt);
1692 return;
1693 }
1694
1695out:
1696 dst_release(&rt->dst);
1697}
1698
1699/*
1700 * Handle ICMP "packet too big" messages
1701 * i.e. Path MTU discovery
1702 */
1703
1704static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr,
1705 struct net *net, u32 pmtu, int ifindex)
1706{
1707 struct rt6_info *rt, *nrt;
1708 int allfrag = 0;
1709again:
1710 rt = rt6_lookup(net, daddr, saddr, ifindex, 0);
1711 if (!rt)
1712 return;
1713
1714 if (rt6_check_expired(rt)) {
1715 ip6_del_rt(rt);
1716 goto again;
1717 }
1718
1719 if (pmtu >= dst_mtu(&rt->dst))
1720 goto out;
1721
1722 if (pmtu < IPV6_MIN_MTU) {
1723 /*
1724 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1725 * MTU (1280) and a fragment header should always be included
1726 * after a node receiving Too Big message reporting PMTU is
1727 * less than the IPv6 Minimum Link MTU.
1728 */
1729 pmtu = IPV6_MIN_MTU;
1730 allfrag = 1;
1731 }
1732
1733 /* New mtu received -> path was valid.
1734 They are sent only in response to data packets,
1735 so that this nexthop apparently is reachable. --ANK
1736 */
1737 dst_confirm(&rt->dst);
1738
1739 /* Host route. If it is static, it would be better
1740 not to override it, but add new one, so that
1741 when cache entry will expire old pmtu
1742 would return automatically.
1743 */
1744 if (rt->rt6i_flags & RTF_CACHE) {
1745 dst_metric_set(&rt->dst, RTAX_MTU, pmtu);
1746 if (allfrag) {
1747 u32 features = dst_metric(&rt->dst, RTAX_FEATURES);
1748 features |= RTAX_FEATURE_ALLFRAG;
1749 dst_metric_set(&rt->dst, RTAX_FEATURES, features);
1750 }
1751 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1752 rt->rt6i_flags |= RTF_MODIFIED;
1753 goto out;
1754 }
1755
1756 /* Network route.
1757 Two cases are possible:
1758 1. It is connected route. Action: COW
1759 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1760 */
1761 if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP))
1762 nrt = rt6_alloc_cow(rt, daddr, saddr);
1763 else
1764 nrt = rt6_alloc_clone(rt, daddr);
1765
1766 if (nrt) {
1767 dst_metric_set(&nrt->dst, RTAX_MTU, pmtu);
1768 if (allfrag) {
1769 u32 features = dst_metric(&nrt->dst, RTAX_FEATURES);
1770 features |= RTAX_FEATURE_ALLFRAG;
1771 dst_metric_set(&nrt->dst, RTAX_FEATURES, features);
1772 }
1773
1774 /* According to RFC 1981, detecting PMTU increase shouldn't be
1775 * happened within 5 mins, the recommended timer is 10 mins.
1776 * Here this route expiration time is set to ip6_rt_mtu_expires
1777 * which is 10 mins. After 10 mins the decreased pmtu is expired
1778 * and detecting PMTU increase will be automatically happened.
1779 */
1780 rt6_update_expires(nrt, net->ipv6.sysctl.ip6_rt_mtu_expires);
1781 nrt->rt6i_flags |= RTF_DYNAMIC;
1782 ip6_ins_rt(nrt);
1783 }
1784out:
1785 dst_release(&rt->dst);
1786}
1787
1788void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr,
1789 struct net_device *dev, u32 pmtu)
1790{
1791 struct net *net = dev_net(dev);
1792
1793 /*
1794 * RFC 1981 states that a node "MUST reduce the size of the packets it
1795 * is sending along the path" that caused the Packet Too Big message.
1796 * Since it's not possible in the general case to determine which
1797 * interface was used to send the original packet, we update the MTU
1798 * on the interface that will be used to send future packets. We also
1799 * update the MTU on the interface that received the Packet Too Big in
1800 * case the original packet was forced out that interface with
1801 * SO_BINDTODEVICE or similar. This is the next best thing to the
1802 * correct behaviour, which would be to update the MTU on all
1803 * interfaces.
1804 */
1805 rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0);
1806 rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex);
1807}
1808
1809/*
1810 * Misc support functions
1811 */
1812
1813static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1814 const struct in6_addr *dest)
1815{
1816 struct net *net = dev_net(ort->dst.dev);
1817 struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
1818 ort->dst.dev, 0);
1819
1820 if (rt) {
1821 rt->dst.input = ort->dst.input;
1822 rt->dst.output = ort->dst.output;
1823 rt->dst.flags |= DST_HOST;
1824
1825 rt->rt6i_dst.addr = *dest;
1826 rt->rt6i_dst.plen = 128;
1827 dst_copy_metrics(&rt->dst, &ort->dst);
1828 rt->dst.error = ort->dst.error;
1829 rt->rt6i_idev = ort->rt6i_idev;
1830 if (rt->rt6i_idev)
1831 in6_dev_hold(rt->rt6i_idev);
1832 rt->dst.lastuse = jiffies;
1833
1834 rt->rt6i_gateway = ort->rt6i_gateway;
1835 rt->rt6i_flags = ort->rt6i_flags;
1836 if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
1837 (RTF_DEFAULT | RTF_ADDRCONF))
1838 rt6_set_from(rt, ort);
1839 else
1840 rt6_clean_expires(rt);
1841 rt->rt6i_metric = 0;
1842
1843#ifdef CONFIG_IPV6_SUBTREES
1844 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1845#endif
1846 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1847 rt->rt6i_table = ort->rt6i_table;
1848 }
1849 return rt;
1850}
1851
1852#ifdef CONFIG_IPV6_ROUTE_INFO
1853static struct rt6_info *rt6_get_route_info(struct net *net,
1854 const struct in6_addr *prefix, int prefixlen,
1855 const struct in6_addr *gwaddr, int ifindex)
1856{
1857 struct fib6_node *fn;
1858 struct rt6_info *rt = NULL;
1859 struct fib6_table *table;
1860
1861 table = fib6_get_table(net, RT6_TABLE_INFO);
1862 if (!table)
1863 return NULL;
1864
1865 write_lock_bh(&table->tb6_lock);
1866 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1867 if (!fn)
1868 goto out;
1869
1870 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1871 if (rt->dst.dev->ifindex != ifindex)
1872 continue;
1873 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1874 continue;
1875 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1876 continue;
1877 dst_hold(&rt->dst);
1878 break;
1879 }
1880out:
1881 write_unlock_bh(&table->tb6_lock);
1882 return rt;
1883}
1884
1885static struct rt6_info *rt6_add_route_info(struct net *net,
1886 const struct in6_addr *prefix, int prefixlen,
1887 const struct in6_addr *gwaddr, int ifindex,
1888 unsigned int pref)
1889{
1890 struct fib6_config cfg = {
1891 .fc_table = RT6_TABLE_INFO,
1892 .fc_metric = IP6_RT_PRIO_USER,
1893 .fc_ifindex = ifindex,
1894 .fc_dst_len = prefixlen,
1895 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1896 RTF_UP | RTF_PREF(pref),
1897 .fc_nlinfo.pid = 0,
1898 .fc_nlinfo.nlh = NULL,
1899 .fc_nlinfo.nl_net = net,
1900 };
1901
1902 cfg.fc_dst = *prefix;
1903 cfg.fc_gateway = *gwaddr;
1904
1905 /* We should treat it as a default route if prefix length is 0. */
1906 if (!prefixlen)
1907 cfg.fc_flags |= RTF_DEFAULT;
1908
1909 ip6_route_add(&cfg);
1910
1911 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1912}
1913#endif
1914
1915struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1916{
1917 struct rt6_info *rt;
1918 struct fib6_table *table;
1919
1920 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1921 if (!table)
1922 return NULL;
1923
1924 write_lock_bh(&table->tb6_lock);
1925 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1926 if (dev == rt->dst.dev &&
1927 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1928 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1929 break;
1930 }
1931 if (rt)
1932 dst_hold(&rt->dst);
1933 write_unlock_bh(&table->tb6_lock);
1934 return rt;
1935}
1936
1937struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1938 struct net_device *dev,
1939 unsigned int pref)
1940{
1941 struct fib6_config cfg = {
1942 .fc_table = RT6_TABLE_DFLT,
1943 .fc_metric = IP6_RT_PRIO_USER,
1944 .fc_ifindex = dev->ifindex,
1945 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1946 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1947 .fc_nlinfo.pid = 0,
1948 .fc_nlinfo.nlh = NULL,
1949 .fc_nlinfo.nl_net = dev_net(dev),
1950 };
1951
1952 cfg.fc_gateway = *gwaddr;
1953
1954 ip6_route_add(&cfg);
1955
1956 return rt6_get_dflt_router(gwaddr, dev);
1957}
1958
1959void rt6_purge_dflt_routers(struct net *net)
1960{
1961 struct rt6_info *rt;
1962 struct fib6_table *table;
1963
1964 /* NOTE: Keep consistent with rt6_get_dflt_router */
1965 table = fib6_get_table(net, RT6_TABLE_DFLT);
1966 if (!table)
1967 return;
1968
1969restart:
1970 read_lock_bh(&table->tb6_lock);
1971 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1972 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1973 dst_hold(&rt->dst);
1974 read_unlock_bh(&table->tb6_lock);
1975 ip6_del_rt(rt);
1976 goto restart;
1977 }
1978 }
1979 read_unlock_bh(&table->tb6_lock);
1980}
1981
1982static void rtmsg_to_fib6_config(struct net *net,
1983 struct in6_rtmsg *rtmsg,
1984 struct fib6_config *cfg)
1985{
1986 memset(cfg, 0, sizeof(*cfg));
1987
1988 cfg->fc_table = RT6_TABLE_MAIN;
1989 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1990 cfg->fc_metric = rtmsg->rtmsg_metric;
1991 cfg->fc_expires = rtmsg->rtmsg_info;
1992 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1993 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1994 cfg->fc_flags = rtmsg->rtmsg_flags;
1995
1996 cfg->fc_nlinfo.nl_net = net;
1997
1998 cfg->fc_dst = rtmsg->rtmsg_dst;
1999 cfg->fc_src = rtmsg->rtmsg_src;
2000 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2001}
2002
2003int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2004{
2005 struct fib6_config cfg;
2006 struct in6_rtmsg rtmsg;
2007 int err;
2008
2009 switch(cmd) {
2010 case SIOCADDRT: /* Add a route */
2011 case SIOCDELRT: /* Delete a route */
2012 if (!capable(CAP_NET_ADMIN))
2013 return -EPERM;
2014 err = copy_from_user(&rtmsg, arg,
2015 sizeof(struct in6_rtmsg));
2016 if (err)
2017 return -EFAULT;
2018
2019 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2020
2021 rtnl_lock();
2022 switch (cmd) {
2023 case SIOCADDRT:
2024 err = ip6_route_add(&cfg);
2025 break;
2026 case SIOCDELRT:
2027 err = ip6_route_del(&cfg);
2028 break;
2029 default:
2030 err = -EINVAL;
2031 }
2032 rtnl_unlock();
2033
2034 return err;
2035 }
2036
2037 return -EINVAL;
2038}
2039
2040/*
2041 * Drop the packet on the floor
2042 */
2043
2044static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2045{
2046 int type;
2047 struct dst_entry *dst = skb_dst(skb);
2048 switch (ipstats_mib_noroutes) {
2049 case IPSTATS_MIB_INNOROUTES:
2050 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2051 if (type == IPV6_ADDR_ANY) {
2052 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2053 IPSTATS_MIB_INADDRERRORS);
2054 break;
2055 }
2056 /* FALLTHROUGH */
2057 case IPSTATS_MIB_OUTNOROUTES:
2058 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2059 ipstats_mib_noroutes);
2060 break;
2061 }
2062 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2063 kfree_skb(skb);
2064 return 0;
2065}
2066
2067static int ip6_pkt_discard(struct sk_buff *skb)
2068{
2069 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2070}
2071
2072static int ip6_pkt_discard_out(struct sk_buff *skb)
2073{
2074 skb->dev = skb_dst(skb)->dev;
2075 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2076}
2077
2078#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2079
2080static int ip6_pkt_prohibit(struct sk_buff *skb)
2081{
2082 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2083}
2084
2085static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2086{
2087 skb->dev = skb_dst(skb)->dev;
2088 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2089}
2090
2091#endif
2092
2093/*
2094 * Allocate a dst for local (unicast / anycast) address.
2095 */
2096
2097struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2098 const struct in6_addr *addr,
2099 bool anycast)
2100{
2101 struct net *net = dev_net(idev->dev);
2102 struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops,
2103 net->loopback_dev, 0);
2104 int err;
2105
2106 if (!rt) {
2107 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
2108 return ERR_PTR(-ENOMEM);
2109 }
2110
2111 in6_dev_hold(idev);
2112
2113 rt->dst.flags |= DST_HOST;
2114 rt->dst.input = ip6_input;
2115 rt->dst.output = ip6_output;
2116 rt->rt6i_idev = idev;
2117 rt->dst.obsolete = -1;
2118
2119 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2120 if (anycast)
2121 rt->rt6i_flags |= RTF_ANYCAST;
2122 else
2123 rt->rt6i_flags |= RTF_LOCAL;
2124 err = rt6_bind_neighbour(rt, rt->dst.dev);
2125 if (err) {
2126 dst_free(&rt->dst);
2127 return ERR_PTR(err);
2128 }
2129
2130 rt->rt6i_dst.addr = *addr;
2131 rt->rt6i_dst.plen = 128;
2132 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2133
2134 atomic_set(&rt->dst.__refcnt, 1);
2135
2136 return rt;
2137}
2138
2139int ip6_route_get_saddr(struct net *net,
2140 struct rt6_info *rt,
2141 const struct in6_addr *daddr,
2142 unsigned int prefs,
2143 struct in6_addr *saddr)
2144{
2145 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2146 int err = 0;
2147 if (rt->rt6i_prefsrc.plen)
2148 *saddr = rt->rt6i_prefsrc.addr;
2149 else
2150 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2151 daddr, prefs, saddr);
2152 return err;
2153}
2154
2155/* remove deleted ip from prefsrc entries */
2156struct arg_dev_net_ip {
2157 struct net_device *dev;
2158 struct net *net;
2159 struct in6_addr *addr;
2160};
2161
2162static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2163{
2164 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2165 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2166 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2167
2168 if (((void *)rt->dst.dev == dev || !dev) &&
2169 rt != net->ipv6.ip6_null_entry &&
2170 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2171 /* remove prefsrc entry */
2172 rt->rt6i_prefsrc.plen = 0;
2173 }
2174 return 0;
2175}
2176
2177void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2178{
2179 struct net *net = dev_net(ifp->idev->dev);
2180 struct arg_dev_net_ip adni = {
2181 .dev = ifp->idev->dev,
2182 .net = net,
2183 .addr = &ifp->addr,
2184 };
2185 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2186}
2187
2188struct arg_dev_net {
2189 struct net_device *dev;
2190 struct net *net;
2191};
2192
2193static int fib6_ifdown(struct rt6_info *rt, void *arg)
2194{
2195 const struct arg_dev_net *adn = arg;
2196 const struct net_device *dev = adn->dev;
2197
2198 if ((rt->dst.dev == dev || !dev) &&
2199 rt != adn->net->ipv6.ip6_null_entry)
2200 return -1;
2201
2202 return 0;
2203}
2204
2205void rt6_ifdown(struct net *net, struct net_device *dev)
2206{
2207 struct arg_dev_net adn = {
2208 .dev = dev,
2209 .net = net,
2210 };
2211
2212 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2213 icmp6_clean_all(fib6_ifdown, &adn);
2214}
2215
2216struct rt6_mtu_change_arg {
2217 struct net_device *dev;
2218 unsigned int mtu;
2219};
2220
2221static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2222{
2223 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2224 struct inet6_dev *idev;
2225
2226 /* In IPv6 pmtu discovery is not optional,
2227 so that RTAX_MTU lock cannot disable it.
2228 We still use this lock to block changes
2229 caused by addrconf/ndisc.
2230 */
2231
2232 idev = __in6_dev_get(arg->dev);
2233 if (!idev)
2234 return 0;
2235
2236 /* For administrative MTU increase, there is no way to discover
2237 IPv6 PMTU increase, so PMTU increase should be updated here.
2238 Since RFC 1981 doesn't include administrative MTU increase
2239 update PMTU increase is a MUST. (i.e. jumbo frame)
2240 */
2241 /*
2242 If new MTU is less than route PMTU, this new MTU will be the
2243 lowest MTU in the path, update the route PMTU to reflect PMTU
2244 decreases; if new MTU is greater than route PMTU, and the
2245 old MTU is the lowest MTU in the path, update the route PMTU
2246 to reflect the increase. In this case if the other nodes' MTU
2247 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2248 PMTU discouvery.
2249 */
2250 if (rt->dst.dev == arg->dev &&
2251 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2252 (dst_mtu(&rt->dst) >= arg->mtu ||
2253 (dst_mtu(&rt->dst) < arg->mtu &&
2254 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2255 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2256 }
2257 return 0;
2258}
2259
2260void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2261{
2262 struct rt6_mtu_change_arg arg = {
2263 .dev = dev,
2264 .mtu = mtu,
2265 };
2266
2267 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2268}
2269
2270static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2271 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2272 [RTA_OIF] = { .type = NLA_U32 },
2273 [RTA_IIF] = { .type = NLA_U32 },
2274 [RTA_PRIORITY] = { .type = NLA_U32 },
2275 [RTA_METRICS] = { .type = NLA_NESTED },
2276};
2277
2278static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2279 struct fib6_config *cfg)
2280{
2281 struct rtmsg *rtm;
2282 struct nlattr *tb[RTA_MAX+1];
2283 int err;
2284
2285 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2286 if (err < 0)
2287 goto errout;
2288
2289 err = -EINVAL;
2290 rtm = nlmsg_data(nlh);
2291 memset(cfg, 0, sizeof(*cfg));
2292
2293 cfg->fc_table = rtm->rtm_table;
2294 cfg->fc_dst_len = rtm->rtm_dst_len;
2295 cfg->fc_src_len = rtm->rtm_src_len;
2296 cfg->fc_flags = RTF_UP;
2297 cfg->fc_protocol = rtm->rtm_protocol;
2298
2299 if (rtm->rtm_type == RTN_UNREACHABLE)
2300 cfg->fc_flags |= RTF_REJECT;
2301
2302 if (rtm->rtm_type == RTN_LOCAL)
2303 cfg->fc_flags |= RTF_LOCAL;
2304
2305 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
2306 cfg->fc_nlinfo.nlh = nlh;
2307 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2308
2309 if (tb[RTA_GATEWAY]) {
2310 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2311 cfg->fc_flags |= RTF_GATEWAY;
2312 }
2313
2314 if (tb[RTA_DST]) {
2315 int plen = (rtm->rtm_dst_len + 7) >> 3;
2316
2317 if (nla_len(tb[RTA_DST]) < plen)
2318 goto errout;
2319
2320 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2321 }
2322
2323 if (tb[RTA_SRC]) {
2324 int plen = (rtm->rtm_src_len + 7) >> 3;
2325
2326 if (nla_len(tb[RTA_SRC]) < plen)
2327 goto errout;
2328
2329 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2330 }
2331
2332 if (tb[RTA_PREFSRC])
2333 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2334
2335 if (tb[RTA_OIF])
2336 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2337
2338 if (tb[RTA_PRIORITY])
2339 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2340
2341 if (tb[RTA_METRICS]) {
2342 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2343 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2344 }
2345
2346 if (tb[RTA_TABLE])
2347 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2348
2349 err = 0;
2350errout:
2351 return err;
2352}
2353
2354static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2355{
2356 struct fib6_config cfg;
2357 int err;
2358
2359 err = rtm_to_fib6_config(skb, nlh, &cfg);
2360 if (err < 0)
2361 return err;
2362
2363 return ip6_route_del(&cfg);
2364}
2365
2366static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2367{
2368 struct fib6_config cfg;
2369 int err;
2370
2371 err = rtm_to_fib6_config(skb, nlh, &cfg);
2372 if (err < 0)
2373 return err;
2374
2375 return ip6_route_add(&cfg);
2376}
2377
2378static inline size_t rt6_nlmsg_size(void)
2379{
2380 return NLMSG_ALIGN(sizeof(struct rtmsg))
2381 + nla_total_size(16) /* RTA_SRC */
2382 + nla_total_size(16) /* RTA_DST */
2383 + nla_total_size(16) /* RTA_GATEWAY */
2384 + nla_total_size(16) /* RTA_PREFSRC */
2385 + nla_total_size(4) /* RTA_TABLE */
2386 + nla_total_size(4) /* RTA_IIF */
2387 + nla_total_size(4) /* RTA_OIF */
2388 + nla_total_size(4) /* RTA_PRIORITY */
2389 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2390 + nla_total_size(sizeof(struct rta_cacheinfo));
2391}
2392
2393static int rt6_fill_node(struct net *net,
2394 struct sk_buff *skb, struct rt6_info *rt,
2395 struct in6_addr *dst, struct in6_addr *src,
2396 int iif, int type, u32 pid, u32 seq,
2397 int prefix, int nowait, unsigned int flags)
2398{
2399 const struct inet_peer *peer;
2400 struct rtmsg *rtm;
2401 struct nlmsghdr *nlh;
2402 long expires;
2403 u32 table;
2404 struct neighbour *n;
2405 u32 ts, tsage;
2406
2407 if (prefix) { /* user wants prefix routes only */
2408 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2409 /* success since this is not a prefix route */
2410 return 1;
2411 }
2412 }
2413
2414 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
2415 if (!nlh)
2416 return -EMSGSIZE;
2417
2418 rtm = nlmsg_data(nlh);
2419 rtm->rtm_family = AF_INET6;
2420 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2421 rtm->rtm_src_len = rt->rt6i_src.plen;
2422 rtm->rtm_tos = 0;
2423 if (rt->rt6i_table)
2424 table = rt->rt6i_table->tb6_id;
2425 else
2426 table = RT6_TABLE_UNSPEC;
2427 rtm->rtm_table = table;
2428 if (nla_put_u32(skb, RTA_TABLE, table))
2429 goto nla_put_failure;
2430 if (rt->rt6i_flags & RTF_REJECT)
2431 rtm->rtm_type = RTN_UNREACHABLE;
2432 else if (rt->rt6i_flags & RTF_LOCAL)
2433 rtm->rtm_type = RTN_LOCAL;
2434 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2435 rtm->rtm_type = RTN_LOCAL;
2436 else
2437 rtm->rtm_type = RTN_UNICAST;
2438 rtm->rtm_flags = 0;
2439 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2440 rtm->rtm_protocol = rt->rt6i_protocol;
2441 if (rt->rt6i_flags & RTF_DYNAMIC)
2442 rtm->rtm_protocol = RTPROT_REDIRECT;
2443 else if (rt->rt6i_flags & RTF_ADDRCONF)
2444 rtm->rtm_protocol = RTPROT_KERNEL;
2445 else if (rt->rt6i_flags & RTF_DEFAULT)
2446 rtm->rtm_protocol = RTPROT_RA;
2447
2448 if (rt->rt6i_flags & RTF_CACHE)
2449 rtm->rtm_flags |= RTM_F_CLONED;
2450
2451 if (dst) {
2452 if (nla_put(skb, RTA_DST, 16, dst))
2453 goto nla_put_failure;
2454 rtm->rtm_dst_len = 128;
2455 } else if (rtm->rtm_dst_len)
2456 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2457 goto nla_put_failure;
2458#ifdef CONFIG_IPV6_SUBTREES
2459 if (src) {
2460 if (nla_put(skb, RTA_SRC, 16, src))
2461 goto nla_put_failure;
2462 rtm->rtm_src_len = 128;
2463 } else if (rtm->rtm_src_len &&
2464 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2465 goto nla_put_failure;
2466#endif
2467 if (iif) {
2468#ifdef CONFIG_IPV6_MROUTE
2469 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2470 int err = ip6mr_get_route(net, skb, rtm, nowait);
2471 if (err <= 0) {
2472 if (!nowait) {
2473 if (err == 0)
2474 return 0;
2475 goto nla_put_failure;
2476 } else {
2477 if (err == -EMSGSIZE)
2478 goto nla_put_failure;
2479 }
2480 }
2481 } else
2482#endif
2483 if (nla_put_u32(skb, RTA_IIF, iif))
2484 goto nla_put_failure;
2485 } else if (dst) {
2486 struct in6_addr saddr_buf;
2487 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2488 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2489 goto nla_put_failure;
2490 }
2491
2492 if (rt->rt6i_prefsrc.plen) {
2493 struct in6_addr saddr_buf;
2494 saddr_buf = rt->rt6i_prefsrc.addr;
2495 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2496 goto nla_put_failure;
2497 }
2498
2499 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2500 goto nla_put_failure;
2501
2502 rcu_read_lock();
2503 n = dst_get_neighbour_noref(&rt->dst);
2504 if (n) {
2505 if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) {
2506 rcu_read_unlock();
2507 goto nla_put_failure;
2508 }
2509 }
2510 rcu_read_unlock();
2511
2512 if (rt->dst.dev &&
2513 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2514 goto nla_put_failure;
2515 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2516 goto nla_put_failure;
2517 if (!(rt->rt6i_flags & RTF_EXPIRES))
2518 expires = 0;
2519 else if (rt->dst.expires - jiffies < INT_MAX)
2520 expires = rt->dst.expires - jiffies;
2521 else
2522 expires = INT_MAX;
2523
2524 peer = rt->rt6i_peer;
2525 ts = tsage = 0;
2526 if (peer && peer->tcp_ts_stamp) {
2527 ts = peer->tcp_ts;
2528 tsage = get_seconds() - peer->tcp_ts_stamp;
2529 }
2530
2531 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, ts, tsage,
2532 expires, rt->dst.error) < 0)
2533 goto nla_put_failure;
2534
2535 return nlmsg_end(skb, nlh);
2536
2537nla_put_failure:
2538 nlmsg_cancel(skb, nlh);
2539 return -EMSGSIZE;
2540}
2541
2542int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2543{
2544 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2545 int prefix;
2546
2547 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2548 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2549 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2550 } else
2551 prefix = 0;
2552
2553 return rt6_fill_node(arg->net,
2554 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2555 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2556 prefix, 0, NLM_F_MULTI);
2557}
2558
2559static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2560{
2561 struct net *net = sock_net(in_skb->sk);
2562 struct nlattr *tb[RTA_MAX+1];
2563 struct rt6_info *rt;
2564 struct sk_buff *skb;
2565 struct rtmsg *rtm;
2566 struct flowi6 fl6;
2567 int err, iif = 0, oif = 0;
2568
2569 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2570 if (err < 0)
2571 goto errout;
2572
2573 err = -EINVAL;
2574 memset(&fl6, 0, sizeof(fl6));
2575
2576 if (tb[RTA_SRC]) {
2577 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2578 goto errout;
2579
2580 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2581 }
2582
2583 if (tb[RTA_DST]) {
2584 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2585 goto errout;
2586
2587 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2588 }
2589
2590 if (tb[RTA_IIF])
2591 iif = nla_get_u32(tb[RTA_IIF]);
2592
2593 if (tb[RTA_OIF])
2594 oif = nla_get_u32(tb[RTA_OIF]);
2595
2596 if (iif) {
2597 struct net_device *dev;
2598 int flags = 0;
2599
2600 dev = __dev_get_by_index(net, iif);
2601 if (!dev) {
2602 err = -ENODEV;
2603 goto errout;
2604 }
2605
2606 fl6.flowi6_iif = iif;
2607
2608 if (!ipv6_addr_any(&fl6.saddr))
2609 flags |= RT6_LOOKUP_F_HAS_SADDR;
2610
2611 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2612 flags);
2613 } else {
2614 fl6.flowi6_oif = oif;
2615
2616 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2617 }
2618
2619 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2620 if (!skb) {
2621 dst_release(&rt->dst);
2622 err = -ENOBUFS;
2623 goto errout;
2624 }
2625
2626 /* Reserve room for dummy headers, this skb can pass
2627 through good chunk of routing engine.
2628 */
2629 skb_reset_mac_header(skb);
2630 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2631
2632 skb_dst_set(skb, &rt->dst);
2633
2634 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2635 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2636 nlh->nlmsg_seq, 0, 0, 0);
2637 if (err < 0) {
2638 kfree_skb(skb);
2639 goto errout;
2640 }
2641
2642 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
2643errout:
2644 return err;
2645}
2646
2647void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2648{
2649 struct sk_buff *skb;
2650 struct net *net = info->nl_net;
2651 u32 seq;
2652 int err;
2653
2654 err = -ENOBUFS;
2655 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2656
2657 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2658 if (!skb)
2659 goto errout;
2660
2661 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2662 event, info->pid, seq, 0, 0, 0);
2663 if (err < 0) {
2664 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2665 WARN_ON(err == -EMSGSIZE);
2666 kfree_skb(skb);
2667 goto errout;
2668 }
2669 rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE,
2670 info->nlh, gfp_any());
2671 return;
2672errout:
2673 if (err < 0)
2674 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2675}
2676
2677static int ip6_route_dev_notify(struct notifier_block *this,
2678 unsigned long event, void *data)
2679{
2680 struct net_device *dev = (struct net_device *)data;
2681 struct net *net = dev_net(dev);
2682
2683 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2684 net->ipv6.ip6_null_entry->dst.dev = dev;
2685 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2686#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2687 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2688 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2689 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2690 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2691#endif
2692 }
2693
2694 return NOTIFY_OK;
2695}
2696
2697/*
2698 * /proc
2699 */
2700
2701#ifdef CONFIG_PROC_FS
2702
2703struct rt6_proc_arg
2704{
2705 char *buffer;
2706 int offset;
2707 int length;
2708 int skip;
2709 int len;
2710};
2711
2712static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2713{
2714 struct seq_file *m = p_arg;
2715 struct neighbour *n;
2716
2717 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2718
2719#ifdef CONFIG_IPV6_SUBTREES
2720 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2721#else
2722 seq_puts(m, "00000000000000000000000000000000 00 ");
2723#endif
2724 rcu_read_lock();
2725 n = dst_get_neighbour_noref(&rt->dst);
2726 if (n) {
2727 seq_printf(m, "%pi6", n->primary_key);
2728 } else {
2729 seq_puts(m, "00000000000000000000000000000000");
2730 }
2731 rcu_read_unlock();
2732 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2733 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2734 rt->dst.__use, rt->rt6i_flags,
2735 rt->dst.dev ? rt->dst.dev->name : "");
2736 return 0;
2737}
2738
2739static int ipv6_route_show(struct seq_file *m, void *v)
2740{
2741 struct net *net = (struct net *)m->private;
2742 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2743 return 0;
2744}
2745
2746static int ipv6_route_open(struct inode *inode, struct file *file)
2747{
2748 return single_open_net(inode, file, ipv6_route_show);
2749}
2750
2751static const struct file_operations ipv6_route_proc_fops = {
2752 .owner = THIS_MODULE,
2753 .open = ipv6_route_open,
2754 .read = seq_read,
2755 .llseek = seq_lseek,
2756 .release = single_release_net,
2757};
2758
2759static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2760{
2761 struct net *net = (struct net *)seq->private;
2762 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2763 net->ipv6.rt6_stats->fib_nodes,
2764 net->ipv6.rt6_stats->fib_route_nodes,
2765 net->ipv6.rt6_stats->fib_rt_alloc,
2766 net->ipv6.rt6_stats->fib_rt_entries,
2767 net->ipv6.rt6_stats->fib_rt_cache,
2768 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2769 net->ipv6.rt6_stats->fib_discarded_routes);
2770
2771 return 0;
2772}
2773
2774static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2775{
2776 return single_open_net(inode, file, rt6_stats_seq_show);
2777}
2778
2779static const struct file_operations rt6_stats_seq_fops = {
2780 .owner = THIS_MODULE,
2781 .open = rt6_stats_seq_open,
2782 .read = seq_read,
2783 .llseek = seq_lseek,
2784 .release = single_release_net,
2785};
2786#endif /* CONFIG_PROC_FS */
2787
2788#ifdef CONFIG_SYSCTL
2789
2790static
2791int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2792 void __user *buffer, size_t *lenp, loff_t *ppos)
2793{
2794 struct net *net;
2795 int delay;
2796 if (!write)
2797 return -EINVAL;
2798
2799 net = (struct net *)ctl->extra1;
2800 delay = net->ipv6.sysctl.flush_delay;
2801 proc_dointvec(ctl, write, buffer, lenp, ppos);
2802 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2803 return 0;
2804}
2805
2806ctl_table ipv6_route_table_template[] = {
2807 {
2808 .procname = "flush",
2809 .data = &init_net.ipv6.sysctl.flush_delay,
2810 .maxlen = sizeof(int),
2811 .mode = 0200,
2812 .proc_handler = ipv6_sysctl_rtcache_flush
2813 },
2814 {
2815 .procname = "gc_thresh",
2816 .data = &ip6_dst_ops_template.gc_thresh,
2817 .maxlen = sizeof(int),
2818 .mode = 0644,
2819 .proc_handler = proc_dointvec,
2820 },
2821 {
2822 .procname = "max_size",
2823 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2824 .maxlen = sizeof(int),
2825 .mode = 0644,
2826 .proc_handler = proc_dointvec,
2827 },
2828 {
2829 .procname = "gc_min_interval",
2830 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2831 .maxlen = sizeof(int),
2832 .mode = 0644,
2833 .proc_handler = proc_dointvec_jiffies,
2834 },
2835 {
2836 .procname = "gc_timeout",
2837 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2838 .maxlen = sizeof(int),
2839 .mode = 0644,
2840 .proc_handler = proc_dointvec_jiffies,
2841 },
2842 {
2843 .procname = "gc_interval",
2844 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2845 .maxlen = sizeof(int),
2846 .mode = 0644,
2847 .proc_handler = proc_dointvec_jiffies,
2848 },
2849 {
2850 .procname = "gc_elasticity",
2851 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2852 .maxlen = sizeof(int),
2853 .mode = 0644,
2854 .proc_handler = proc_dointvec,
2855 },
2856 {
2857 .procname = "mtu_expires",
2858 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2859 .maxlen = sizeof(int),
2860 .mode = 0644,
2861 .proc_handler = proc_dointvec_jiffies,
2862 },
2863 {
2864 .procname = "min_adv_mss",
2865 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2866 .maxlen = sizeof(int),
2867 .mode = 0644,
2868 .proc_handler = proc_dointvec,
2869 },
2870 {
2871 .procname = "gc_min_interval_ms",
2872 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2873 .maxlen = sizeof(int),
2874 .mode = 0644,
2875 .proc_handler = proc_dointvec_ms_jiffies,
2876 },
2877 { }
2878};
2879
2880struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2881{
2882 struct ctl_table *table;
2883
2884 table = kmemdup(ipv6_route_table_template,
2885 sizeof(ipv6_route_table_template),
2886 GFP_KERNEL);
2887
2888 if (table) {
2889 table[0].data = &net->ipv6.sysctl.flush_delay;
2890 table[0].extra1 = net;
2891 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2892 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2893 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2894 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2895 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2896 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2897 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2898 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2899 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2900 }
2901
2902 return table;
2903}
2904#endif
2905
2906static int __net_init ip6_route_net_init(struct net *net)
2907{
2908 int ret = -ENOMEM;
2909
2910 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2911 sizeof(net->ipv6.ip6_dst_ops));
2912
2913 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2914 goto out_ip6_dst_ops;
2915
2916 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2917 sizeof(*net->ipv6.ip6_null_entry),
2918 GFP_KERNEL);
2919 if (!net->ipv6.ip6_null_entry)
2920 goto out_ip6_dst_entries;
2921 net->ipv6.ip6_null_entry->dst.path =
2922 (struct dst_entry *)net->ipv6.ip6_null_entry;
2923 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2924 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2925 ip6_template_metrics, true);
2926
2927#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2928 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2929 sizeof(*net->ipv6.ip6_prohibit_entry),
2930 GFP_KERNEL);
2931 if (!net->ipv6.ip6_prohibit_entry)
2932 goto out_ip6_null_entry;
2933 net->ipv6.ip6_prohibit_entry->dst.path =
2934 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2935 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2936 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2937 ip6_template_metrics, true);
2938
2939 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2940 sizeof(*net->ipv6.ip6_blk_hole_entry),
2941 GFP_KERNEL);
2942 if (!net->ipv6.ip6_blk_hole_entry)
2943 goto out_ip6_prohibit_entry;
2944 net->ipv6.ip6_blk_hole_entry->dst.path =
2945 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
2946 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2947 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
2948 ip6_template_metrics, true);
2949#endif
2950
2951 net->ipv6.sysctl.flush_delay = 0;
2952 net->ipv6.sysctl.ip6_rt_max_size = 4096;
2953 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
2954 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
2955 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
2956 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
2957 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
2958 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
2959
2960 net->ipv6.ip6_rt_gc_expire = 30*HZ;
2961
2962 ret = 0;
2963out:
2964 return ret;
2965
2966#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2967out_ip6_prohibit_entry:
2968 kfree(net->ipv6.ip6_prohibit_entry);
2969out_ip6_null_entry:
2970 kfree(net->ipv6.ip6_null_entry);
2971#endif
2972out_ip6_dst_entries:
2973 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
2974out_ip6_dst_ops:
2975 goto out;
2976}
2977
2978static void __net_exit ip6_route_net_exit(struct net *net)
2979{
2980 kfree(net->ipv6.ip6_null_entry);
2981#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2982 kfree(net->ipv6.ip6_prohibit_entry);
2983 kfree(net->ipv6.ip6_blk_hole_entry);
2984#endif
2985 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
2986}
2987
2988static int __net_init ip6_route_net_init_late(struct net *net)
2989{
2990#ifdef CONFIG_PROC_FS
2991 proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
2992 proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2993#endif
2994 return 0;
2995}
2996
2997static void __net_exit ip6_route_net_exit_late(struct net *net)
2998{
2999#ifdef CONFIG_PROC_FS
3000 proc_net_remove(net, "ipv6_route");
3001 proc_net_remove(net, "rt6_stats");
3002#endif
3003}
3004
3005static struct pernet_operations ip6_route_net_ops = {
3006 .init = ip6_route_net_init,
3007 .exit = ip6_route_net_exit,
3008};
3009
3010static struct pernet_operations ip6_route_net_late_ops = {
3011 .init = ip6_route_net_init_late,
3012 .exit = ip6_route_net_exit_late,
3013};
3014
3015static struct notifier_block ip6_route_dev_notifier = {
3016 .notifier_call = ip6_route_dev_notify,
3017 .priority = 0,
3018};
3019
3020int __init ip6_route_init(void)
3021{
3022 int ret;
3023
3024 ret = -ENOMEM;
3025 ip6_dst_ops_template.kmem_cachep =
3026 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3027 SLAB_HWCACHE_ALIGN, NULL);
3028 if (!ip6_dst_ops_template.kmem_cachep)
3029 goto out;
3030
3031 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3032 if (ret)
3033 goto out_kmem_cache;
3034
3035 ret = register_pernet_subsys(&ip6_route_net_ops);
3036 if (ret)
3037 goto out_dst_entries;
3038
3039 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3040
3041 /* Registering of the loopback is done before this portion of code,
3042 * the loopback reference in rt6_info will not be taken, do it
3043 * manually for init_net */
3044 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3045 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3046 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3047 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3048 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3049 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3050 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3051 #endif
3052 ret = fib6_init();
3053 if (ret)
3054 goto out_register_subsys;
3055
3056 ret = xfrm6_init();
3057 if (ret)
3058 goto out_fib6_init;
3059
3060 ret = fib6_rules_init();
3061 if (ret)
3062 goto xfrm6_init;
3063
3064 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3065 if (ret)
3066 goto fib6_rules_init;
3067
3068 ret = -ENOBUFS;
3069 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3070 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3071 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3072 goto out_register_late_subsys;
3073
3074 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3075 if (ret)
3076 goto out_register_late_subsys;
3077
3078out:
3079 return ret;
3080
3081out_register_late_subsys:
3082 unregister_pernet_subsys(&ip6_route_net_late_ops);
3083fib6_rules_init:
3084 fib6_rules_cleanup();
3085xfrm6_init:
3086 xfrm6_fini();
3087out_fib6_init:
3088 fib6_gc_cleanup();
3089out_register_subsys:
3090 unregister_pernet_subsys(&ip6_route_net_ops);
3091out_dst_entries:
3092 dst_entries_destroy(&ip6_dst_blackhole_ops);
3093out_kmem_cache:
3094 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3095 goto out;
3096}
3097
3098void ip6_route_cleanup(void)
3099{
3100 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3101 unregister_pernet_subsys(&ip6_route_net_late_ops);
3102 fib6_rules_cleanup();
3103 xfrm6_fini();
3104 fib6_gc_cleanup();
3105 unregister_pernet_subsys(&ip6_route_net_ops);
3106 dst_entries_destroy(&ip6_dst_blackhole_ops);
3107 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3108}