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23#define pr_fmt(fmt) "IPv6: " fmt
24
25#include <linux/capability.h>
26#include <linux/errno.h>
27#include <linux/export.h>
28#include <linux/types.h>
29#include <linux/times.h>
30#include <linux/socket.h>
31#include <linux/sockios.h>
32#include <linux/net.h>
33#include <linux/route.h>
34#include <linux/netdevice.h>
35#include <linux/in6.h>
36#include <linux/mroute6.h>
37#include <linux/init.h>
38#include <linux/if_arp.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41#include <linux/nsproxy.h>
42#include <linux/slab.h>
43#include <linux/jhash.h>
44#include <linux/siphash.h>
45#include <net/net_namespace.h>
46#include <net/snmp.h>
47#include <net/ipv6.h>
48#include <net/ip6_fib.h>
49#include <net/ip6_route.h>
50#include <net/ndisc.h>
51#include <net/addrconf.h>
52#include <net/tcp.h>
53#include <linux/rtnetlink.h>
54#include <net/dst.h>
55#include <net/dst_metadata.h>
56#include <net/xfrm.h>
57#include <net/netevent.h>
58#include <net/netlink.h>
59#include <net/rtnh.h>
60#include <net/lwtunnel.h>
61#include <net/ip_tunnels.h>
62#include <net/l3mdev.h>
63#include <net/ip.h>
64#include <linux/uaccess.h>
65#include <linux/btf_ids.h>
66
67#ifdef CONFIG_SYSCTL
68#include <linux/sysctl.h>
69#endif
70
71static int ip6_rt_type_to_error(u8 fib6_type);
72
73#define CREATE_TRACE_POINTS
74#include <trace/events/fib6.h>
75EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
76#undef CREATE_TRACE_POINTS
77
78enum rt6_nud_state {
79 RT6_NUD_FAIL_HARD = -3,
80 RT6_NUD_FAIL_PROBE = -2,
81 RT6_NUD_FAIL_DO_RR = -1,
82 RT6_NUD_SUCCEED = 1
83};
84
85INDIRECT_CALLABLE_SCOPE
86struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
87static unsigned int ip6_default_advmss(const struct dst_entry *dst);
88INDIRECT_CALLABLE_SCOPE
89unsigned int ip6_mtu(const struct dst_entry *dst);
90static struct dst_entry *ip6_negative_advice(struct dst_entry *);
91static void ip6_dst_destroy(struct dst_entry *);
92static void ip6_dst_ifdown(struct dst_entry *,
93 struct net_device *dev, int how);
94static int ip6_dst_gc(struct dst_ops *ops);
95
96static int ip6_pkt_discard(struct sk_buff *skb);
97static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
98static int ip6_pkt_prohibit(struct sk_buff *skb);
99static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
100static void ip6_link_failure(struct sk_buff *skb);
101static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
102 struct sk_buff *skb, u32 mtu,
103 bool confirm_neigh);
104static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
105 struct sk_buff *skb);
106static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
107 int strict);
108static size_t rt6_nlmsg_size(struct fib6_info *f6i);
109static int rt6_fill_node(struct net *net, struct sk_buff *skb,
110 struct fib6_info *rt, struct dst_entry *dst,
111 struct in6_addr *dest, struct in6_addr *src,
112 int iif, int type, u32 portid, u32 seq,
113 unsigned int flags);
114static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
115 const struct in6_addr *daddr,
116 const struct in6_addr *saddr);
117
118#ifdef CONFIG_IPV6_ROUTE_INFO
119static struct fib6_info *rt6_add_route_info(struct net *net,
120 const struct in6_addr *prefix, int prefixlen,
121 const struct in6_addr *gwaddr,
122 struct net_device *dev,
123 unsigned int pref);
124static struct fib6_info *rt6_get_route_info(struct net *net,
125 const struct in6_addr *prefix, int prefixlen,
126 const struct in6_addr *gwaddr,
127 struct net_device *dev);
128#endif
129
130struct uncached_list {
131 spinlock_t lock;
132 struct list_head head;
133};
134
135static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
136
137void rt6_uncached_list_add(struct rt6_info *rt)
138{
139 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
140
141 rt->rt6i_uncached_list = ul;
142
143 spin_lock_bh(&ul->lock);
144 list_add_tail(&rt->rt6i_uncached, &ul->head);
145 spin_unlock_bh(&ul->lock);
146}
147
148void rt6_uncached_list_del(struct rt6_info *rt)
149{
150 if (!list_empty(&rt->rt6i_uncached)) {
151 struct uncached_list *ul = rt->rt6i_uncached_list;
152 struct net *net = dev_net(rt->dst.dev);
153
154 spin_lock_bh(&ul->lock);
155 list_del(&rt->rt6i_uncached);
156 atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
157 spin_unlock_bh(&ul->lock);
158 }
159}
160
161static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
162{
163 struct net_device *loopback_dev = net->loopback_dev;
164 int cpu;
165
166 if (dev == loopback_dev)
167 return;
168
169 for_each_possible_cpu(cpu) {
170 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
171 struct rt6_info *rt;
172
173 spin_lock_bh(&ul->lock);
174 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
175 struct inet6_dev *rt_idev = rt->rt6i_idev;
176 struct net_device *rt_dev = rt->dst.dev;
177
178 if (rt_idev->dev == dev) {
179 rt->rt6i_idev = in6_dev_get(loopback_dev);
180 in6_dev_put(rt_idev);
181 }
182
183 if (rt_dev == dev) {
184 rt->dst.dev = blackhole_netdev;
185 dev_hold(rt->dst.dev);
186 dev_put(rt_dev);
187 }
188 }
189 spin_unlock_bh(&ul->lock);
190 }
191}
192
193static inline const void *choose_neigh_daddr(const struct in6_addr *p,
194 struct sk_buff *skb,
195 const void *daddr)
196{
197 if (!ipv6_addr_any(p))
198 return (const void *) p;
199 else if (skb)
200 return &ipv6_hdr(skb)->daddr;
201 return daddr;
202}
203
204struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
205 struct net_device *dev,
206 struct sk_buff *skb,
207 const void *daddr)
208{
209 struct neighbour *n;
210
211 daddr = choose_neigh_daddr(gw, skb, daddr);
212 n = __ipv6_neigh_lookup(dev, daddr);
213 if (n)
214 return n;
215
216 n = neigh_create(&nd_tbl, daddr, dev);
217 return IS_ERR(n) ? NULL : n;
218}
219
220static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
221 struct sk_buff *skb,
222 const void *daddr)
223{
224 const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
225
226 return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any),
227 dst->dev, skb, daddr);
228}
229
230static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
231{
232 struct net_device *dev = dst->dev;
233 struct rt6_info *rt = (struct rt6_info *)dst;
234
235 daddr = choose_neigh_daddr(rt6_nexthop(rt, &in6addr_any), NULL, daddr);
236 if (!daddr)
237 return;
238 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
239 return;
240 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
241 return;
242 __ipv6_confirm_neigh(dev, daddr);
243}
244
245static struct dst_ops ip6_dst_ops_template = {
246 .family = AF_INET6,
247 .gc = ip6_dst_gc,
248 .gc_thresh = 1024,
249 .check = ip6_dst_check,
250 .default_advmss = ip6_default_advmss,
251 .mtu = ip6_mtu,
252 .cow_metrics = dst_cow_metrics_generic,
253 .destroy = ip6_dst_destroy,
254 .ifdown = ip6_dst_ifdown,
255 .negative_advice = ip6_negative_advice,
256 .link_failure = ip6_link_failure,
257 .update_pmtu = ip6_rt_update_pmtu,
258 .redirect = rt6_do_redirect,
259 .local_out = __ip6_local_out,
260 .neigh_lookup = ip6_dst_neigh_lookup,
261 .confirm_neigh = ip6_confirm_neigh,
262};
263
264static struct dst_ops ip6_dst_blackhole_ops = {
265 .family = AF_INET6,
266 .default_advmss = ip6_default_advmss,
267 .neigh_lookup = ip6_dst_neigh_lookup,
268 .check = ip6_dst_check,
269 .destroy = ip6_dst_destroy,
270 .cow_metrics = dst_cow_metrics_generic,
271 .update_pmtu = dst_blackhole_update_pmtu,
272 .redirect = dst_blackhole_redirect,
273 .mtu = dst_blackhole_mtu,
274};
275
276static const u32 ip6_template_metrics[RTAX_MAX] = {
277 [RTAX_HOPLIMIT - 1] = 0,
278};
279
280static const struct fib6_info fib6_null_entry_template = {
281 .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
282 .fib6_protocol = RTPROT_KERNEL,
283 .fib6_metric = ~(u32)0,
284 .fib6_ref = REFCOUNT_INIT(1),
285 .fib6_type = RTN_UNREACHABLE,
286 .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
287};
288
289static const struct rt6_info ip6_null_entry_template = {
290 .dst = {
291 .__refcnt = ATOMIC_INIT(1),
292 .__use = 1,
293 .obsolete = DST_OBSOLETE_FORCE_CHK,
294 .error = -ENETUNREACH,
295 .input = ip6_pkt_discard,
296 .output = ip6_pkt_discard_out,
297 },
298 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
299};
300
301#ifdef CONFIG_IPV6_MULTIPLE_TABLES
302
303static const struct rt6_info ip6_prohibit_entry_template = {
304 .dst = {
305 .__refcnt = ATOMIC_INIT(1),
306 .__use = 1,
307 .obsolete = DST_OBSOLETE_FORCE_CHK,
308 .error = -EACCES,
309 .input = ip6_pkt_prohibit,
310 .output = ip6_pkt_prohibit_out,
311 },
312 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
313};
314
315static const struct rt6_info ip6_blk_hole_entry_template = {
316 .dst = {
317 .__refcnt = ATOMIC_INIT(1),
318 .__use = 1,
319 .obsolete = DST_OBSOLETE_FORCE_CHK,
320 .error = -EINVAL,
321 .input = dst_discard,
322 .output = dst_discard_out,
323 },
324 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
325};
326
327#endif
328
329static void rt6_info_init(struct rt6_info *rt)
330{
331 struct dst_entry *dst = &rt->dst;
332
333 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
334 INIT_LIST_HEAD(&rt->rt6i_uncached);
335}
336
337
338struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
339 int flags)
340{
341 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
342 1, DST_OBSOLETE_FORCE_CHK, flags);
343
344 if (rt) {
345 rt6_info_init(rt);
346 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
347 }
348
349 return rt;
350}
351EXPORT_SYMBOL(ip6_dst_alloc);
352
353static void ip6_dst_destroy(struct dst_entry *dst)
354{
355 struct rt6_info *rt = (struct rt6_info *)dst;
356 struct fib6_info *from;
357 struct inet6_dev *idev;
358
359 ip_dst_metrics_put(dst);
360 rt6_uncached_list_del(rt);
361
362 idev = rt->rt6i_idev;
363 if (idev) {
364 rt->rt6i_idev = NULL;
365 in6_dev_put(idev);
366 }
367
368 from = xchg((__force struct fib6_info **)&rt->from, NULL);
369 fib6_info_release(from);
370}
371
372static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
373 int how)
374{
375 struct rt6_info *rt = (struct rt6_info *)dst;
376 struct inet6_dev *idev = rt->rt6i_idev;
377 struct net_device *loopback_dev =
378 dev_net(dev)->loopback_dev;
379
380 if (idev && idev->dev != loopback_dev) {
381 struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
382 if (loopback_idev) {
383 rt->rt6i_idev = loopback_idev;
384 in6_dev_put(idev);
385 }
386 }
387}
388
389static bool __rt6_check_expired(const struct rt6_info *rt)
390{
391 if (rt->rt6i_flags & RTF_EXPIRES)
392 return time_after(jiffies, rt->dst.expires);
393 else
394 return false;
395}
396
397static bool rt6_check_expired(const struct rt6_info *rt)
398{
399 struct fib6_info *from;
400
401 from = rcu_dereference(rt->from);
402
403 if (rt->rt6i_flags & RTF_EXPIRES) {
404 if (time_after(jiffies, rt->dst.expires))
405 return true;
406 } else if (from) {
407 return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
408 fib6_check_expired(from);
409 }
410 return false;
411}
412
413void fib6_select_path(const struct net *net, struct fib6_result *res,
414 struct flowi6 *fl6, int oif, bool have_oif_match,
415 const struct sk_buff *skb, int strict)
416{
417 struct fib6_info *sibling, *next_sibling;
418 struct fib6_info *match = res->f6i;
419
420 if (!match->nh && (!match->fib6_nsiblings || have_oif_match))
421 goto out;
422
423 if (match->nh && have_oif_match && res->nh)
424 return;
425
426
427
428
429 if (!fl6->mp_hash &&
430 (!match->nh || nexthop_is_multipath(match->nh)))
431 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
432
433 if (unlikely(match->nh)) {
434 nexthop_path_fib6_result(res, fl6->mp_hash);
435 return;
436 }
437
438 if (fl6->mp_hash <= atomic_read(&match->fib6_nh->fib_nh_upper_bound))
439 goto out;
440
441 list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
442 fib6_siblings) {
443 const struct fib6_nh *nh = sibling->fib6_nh;
444 int nh_upper_bound;
445
446 nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound);
447 if (fl6->mp_hash > nh_upper_bound)
448 continue;
449 if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0)
450 break;
451 match = sibling;
452 break;
453 }
454
455out:
456 res->f6i = match;
457 res->nh = match->fib6_nh;
458}
459
460
461
462
463
464static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh,
465 const struct in6_addr *saddr, int oif, int flags)
466{
467 const struct net_device *dev;
468
469 if (nh->fib_nh_flags & RTNH_F_DEAD)
470 return false;
471
472 dev = nh->fib_nh_dev;
473 if (oif) {
474 if (dev->ifindex == oif)
475 return true;
476 } else {
477 if (ipv6_chk_addr(net, saddr, dev,
478 flags & RT6_LOOKUP_F_IFACE))
479 return true;
480 }
481
482 return false;
483}
484
485struct fib6_nh_dm_arg {
486 struct net *net;
487 const struct in6_addr *saddr;
488 int oif;
489 int flags;
490 struct fib6_nh *nh;
491};
492
493static int __rt6_nh_dev_match(struct fib6_nh *nh, void *_arg)
494{
495 struct fib6_nh_dm_arg *arg = _arg;
496
497 arg->nh = nh;
498 return __rt6_device_match(arg->net, nh, arg->saddr, arg->oif,
499 arg->flags);
500}
501
502
503static struct fib6_nh *rt6_nh_dev_match(struct net *net, struct nexthop *nh,
504 struct fib6_result *res,
505 const struct in6_addr *saddr,
506 int oif, int flags)
507{
508 struct fib6_nh_dm_arg arg = {
509 .net = net,
510 .saddr = saddr,
511 .oif = oif,
512 .flags = flags,
513 };
514
515 if (nexthop_is_blackhole(nh))
516 return NULL;
517
518 if (nexthop_for_each_fib6_nh(nh, __rt6_nh_dev_match, &arg))
519 return arg.nh;
520
521 return NULL;
522}
523
524static void rt6_device_match(struct net *net, struct fib6_result *res,
525 const struct in6_addr *saddr, int oif, int flags)
526{
527 struct fib6_info *f6i = res->f6i;
528 struct fib6_info *spf6i;
529 struct fib6_nh *nh;
530
531 if (!oif && ipv6_addr_any(saddr)) {
532 if (unlikely(f6i->nh)) {
533 nh = nexthop_fib6_nh(f6i->nh);
534 if (nexthop_is_blackhole(f6i->nh))
535 goto out_blackhole;
536 } else {
537 nh = f6i->fib6_nh;
538 }
539 if (!(nh->fib_nh_flags & RTNH_F_DEAD))
540 goto out;
541 }
542
543 for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) {
544 bool matched = false;
545
546 if (unlikely(spf6i->nh)) {
547 nh = rt6_nh_dev_match(net, spf6i->nh, res, saddr,
548 oif, flags);
549 if (nh)
550 matched = true;
551 } else {
552 nh = spf6i->fib6_nh;
553 if (__rt6_device_match(net, nh, saddr, oif, flags))
554 matched = true;
555 }
556 if (matched) {
557 res->f6i = spf6i;
558 goto out;
559 }
560 }
561
562 if (oif && flags & RT6_LOOKUP_F_IFACE) {
563 res->f6i = net->ipv6.fib6_null_entry;
564 nh = res->f6i->fib6_nh;
565 goto out;
566 }
567
568 if (unlikely(f6i->nh)) {
569 nh = nexthop_fib6_nh(f6i->nh);
570 if (nexthop_is_blackhole(f6i->nh))
571 goto out_blackhole;
572 } else {
573 nh = f6i->fib6_nh;
574 }
575
576 if (nh->fib_nh_flags & RTNH_F_DEAD) {
577 res->f6i = net->ipv6.fib6_null_entry;
578 nh = res->f6i->fib6_nh;
579 }
580out:
581 res->nh = nh;
582 res->fib6_type = res->f6i->fib6_type;
583 res->fib6_flags = res->f6i->fib6_flags;
584 return;
585
586out_blackhole:
587 res->fib6_flags |= RTF_REJECT;
588 res->fib6_type = RTN_BLACKHOLE;
589 res->nh = nh;
590}
591
592#ifdef CONFIG_IPV6_ROUTER_PREF
593struct __rt6_probe_work {
594 struct work_struct work;
595 struct in6_addr target;
596 struct net_device *dev;
597};
598
599static void rt6_probe_deferred(struct work_struct *w)
600{
601 struct in6_addr mcaddr;
602 struct __rt6_probe_work *work =
603 container_of(w, struct __rt6_probe_work, work);
604
605 addrconf_addr_solict_mult(&work->target, &mcaddr);
606 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
607 dev_put(work->dev);
608 kfree(work);
609}
610
611static void rt6_probe(struct fib6_nh *fib6_nh)
612{
613 struct __rt6_probe_work *work = NULL;
614 const struct in6_addr *nh_gw;
615 unsigned long last_probe;
616 struct neighbour *neigh;
617 struct net_device *dev;
618 struct inet6_dev *idev;
619
620
621
622
623
624
625
626
627
628 if (!fib6_nh->fib_nh_gw_family)
629 return;
630
631 nh_gw = &fib6_nh->fib_nh_gw6;
632 dev = fib6_nh->fib_nh_dev;
633 rcu_read_lock_bh();
634 last_probe = READ_ONCE(fib6_nh->last_probe);
635 idev = __in6_dev_get(dev);
636 neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
637 if (neigh) {
638 if (neigh->nud_state & NUD_VALID)
639 goto out;
640
641 write_lock(&neigh->lock);
642 if (!(neigh->nud_state & NUD_VALID) &&
643 time_after(jiffies,
644 neigh->updated + idev->cnf.rtr_probe_interval)) {
645 work = kmalloc(sizeof(*work), GFP_ATOMIC);
646 if (work)
647 __neigh_set_probe_once(neigh);
648 }
649 write_unlock(&neigh->lock);
650 } else if (time_after(jiffies, last_probe +
651 idev->cnf.rtr_probe_interval)) {
652 work = kmalloc(sizeof(*work), GFP_ATOMIC);
653 }
654
655 if (!work || cmpxchg(&fib6_nh->last_probe,
656 last_probe, jiffies) != last_probe) {
657 kfree(work);
658 } else {
659 INIT_WORK(&work->work, rt6_probe_deferred);
660 work->target = *nh_gw;
661 dev_hold(dev);
662 work->dev = dev;
663 schedule_work(&work->work);
664 }
665
666out:
667 rcu_read_unlock_bh();
668}
669#else
670static inline void rt6_probe(struct fib6_nh *fib6_nh)
671{
672}
673#endif
674
675
676
677
678static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
679{
680 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
681 struct neighbour *neigh;
682
683 rcu_read_lock_bh();
684 neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
685 &fib6_nh->fib_nh_gw6);
686 if (neigh) {
687 read_lock(&neigh->lock);
688 if (neigh->nud_state & NUD_VALID)
689 ret = RT6_NUD_SUCCEED;
690#ifdef CONFIG_IPV6_ROUTER_PREF
691 else if (!(neigh->nud_state & NUD_FAILED))
692 ret = RT6_NUD_SUCCEED;
693 else
694 ret = RT6_NUD_FAIL_PROBE;
695#endif
696 read_unlock(&neigh->lock);
697 } else {
698 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
699 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
700 }
701 rcu_read_unlock_bh();
702
703 return ret;
704}
705
706static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
707 int strict)
708{
709 int m = 0;
710
711 if (!oif || nh->fib_nh_dev->ifindex == oif)
712 m = 2;
713
714 if (!m && (strict & RT6_LOOKUP_F_IFACE))
715 return RT6_NUD_FAIL_HARD;
716#ifdef CONFIG_IPV6_ROUTER_PREF
717 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
718#endif
719 if ((strict & RT6_LOOKUP_F_REACHABLE) &&
720 !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
721 int n = rt6_check_neigh(nh);
722 if (n < 0)
723 return n;
724 }
725 return m;
726}
727
728static bool find_match(struct fib6_nh *nh, u32 fib6_flags,
729 int oif, int strict, int *mpri, bool *do_rr)
730{
731 bool match_do_rr = false;
732 bool rc = false;
733 int m;
734
735 if (nh->fib_nh_flags & RTNH_F_DEAD)
736 goto out;
737
738 if (ip6_ignore_linkdown(nh->fib_nh_dev) &&
739 nh->fib_nh_flags & RTNH_F_LINKDOWN &&
740 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
741 goto out;
742
743 m = rt6_score_route(nh, fib6_flags, oif, strict);
744 if (m == RT6_NUD_FAIL_DO_RR) {
745 match_do_rr = true;
746 m = 0;
747 } else if (m == RT6_NUD_FAIL_HARD) {
748 goto out;
749 }
750
751 if (strict & RT6_LOOKUP_F_REACHABLE)
752 rt6_probe(nh);
753
754
755 if (m > *mpri) {
756 *do_rr = match_do_rr;
757 *mpri = m;
758 rc = true;
759 }
760out:
761 return rc;
762}
763
764struct fib6_nh_frl_arg {
765 u32 flags;
766 int oif;
767 int strict;
768 int *mpri;
769 bool *do_rr;
770 struct fib6_nh *nh;
771};
772
773static int rt6_nh_find_match(struct fib6_nh *nh, void *_arg)
774{
775 struct fib6_nh_frl_arg *arg = _arg;
776
777 arg->nh = nh;
778 return find_match(nh, arg->flags, arg->oif, arg->strict,
779 arg->mpri, arg->do_rr);
780}
781
782static void __find_rr_leaf(struct fib6_info *f6i_start,
783 struct fib6_info *nomatch, u32 metric,
784 struct fib6_result *res, struct fib6_info **cont,
785 int oif, int strict, bool *do_rr, int *mpri)
786{
787 struct fib6_info *f6i;
788
789 for (f6i = f6i_start;
790 f6i && f6i != nomatch;
791 f6i = rcu_dereference(f6i->fib6_next)) {
792 bool matched = false;
793 struct fib6_nh *nh;
794
795 if (cont && f6i->fib6_metric != metric) {
796 *cont = f6i;
797 return;
798 }
799
800 if (fib6_check_expired(f6i))
801 continue;
802
803 if (unlikely(f6i->nh)) {
804 struct fib6_nh_frl_arg arg = {
805 .flags = f6i->fib6_flags,
806 .oif = oif,
807 .strict = strict,
808 .mpri = mpri,
809 .do_rr = do_rr
810 };
811
812 if (nexthop_is_blackhole(f6i->nh)) {
813 res->fib6_flags = RTF_REJECT;
814 res->fib6_type = RTN_BLACKHOLE;
815 res->f6i = f6i;
816 res->nh = nexthop_fib6_nh(f6i->nh);
817 return;
818 }
819 if (nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_find_match,
820 &arg)) {
821 matched = true;
822 nh = arg.nh;
823 }
824 } else {
825 nh = f6i->fib6_nh;
826 if (find_match(nh, f6i->fib6_flags, oif, strict,
827 mpri, do_rr))
828 matched = true;
829 }
830 if (matched) {
831 res->f6i = f6i;
832 res->nh = nh;
833 res->fib6_flags = f6i->fib6_flags;
834 res->fib6_type = f6i->fib6_type;
835 }
836 }
837}
838
839static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf,
840 struct fib6_info *rr_head, int oif, int strict,
841 bool *do_rr, struct fib6_result *res)
842{
843 u32 metric = rr_head->fib6_metric;
844 struct fib6_info *cont = NULL;
845 int mpri = -1;
846
847 __find_rr_leaf(rr_head, NULL, metric, res, &cont,
848 oif, strict, do_rr, &mpri);
849
850 __find_rr_leaf(leaf, rr_head, metric, res, &cont,
851 oif, strict, do_rr, &mpri);
852
853 if (res->f6i || !cont)
854 return;
855
856 __find_rr_leaf(cont, NULL, metric, res, NULL,
857 oif, strict, do_rr, &mpri);
858}
859
860static void rt6_select(struct net *net, struct fib6_node *fn, int oif,
861 struct fib6_result *res, int strict)
862{
863 struct fib6_info *leaf = rcu_dereference(fn->leaf);
864 struct fib6_info *rt0;
865 bool do_rr = false;
866 int key_plen;
867
868
869 res->f6i = NULL;
870
871 if (!leaf || leaf == net->ipv6.fib6_null_entry)
872 goto out;
873
874 rt0 = rcu_dereference(fn->rr_ptr);
875 if (!rt0)
876 rt0 = leaf;
877
878
879
880
881
882
883 key_plen = rt0->fib6_dst.plen;
884#ifdef CONFIG_IPV6_SUBTREES
885 if (rt0->fib6_src.plen)
886 key_plen = rt0->fib6_src.plen;
887#endif
888 if (fn->fn_bit != key_plen)
889 goto out;
890
891 find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res);
892 if (do_rr) {
893 struct fib6_info *next = rcu_dereference(rt0->fib6_next);
894
895
896 if (!next || next->fib6_metric != rt0->fib6_metric)
897 next = leaf;
898
899 if (next != rt0) {
900 spin_lock_bh(&leaf->fib6_table->tb6_lock);
901
902 if (next->fib6_node)
903 rcu_assign_pointer(fn->rr_ptr, next);
904 spin_unlock_bh(&leaf->fib6_table->tb6_lock);
905 }
906 }
907
908out:
909 if (!res->f6i) {
910 res->f6i = net->ipv6.fib6_null_entry;
911 res->nh = res->f6i->fib6_nh;
912 res->fib6_flags = res->f6i->fib6_flags;
913 res->fib6_type = res->f6i->fib6_type;
914 }
915}
916
917static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
918{
919 return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
920 res->nh->fib_nh_gw_family;
921}
922
923#ifdef CONFIG_IPV6_ROUTE_INFO
924int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
925 const struct in6_addr *gwaddr)
926{
927 struct net *net = dev_net(dev);
928 struct route_info *rinfo = (struct route_info *) opt;
929 struct in6_addr prefix_buf, *prefix;
930 unsigned int pref;
931 unsigned long lifetime;
932 struct fib6_info *rt;
933
934 if (len < sizeof(struct route_info)) {
935 return -EINVAL;
936 }
937
938
939 if (rinfo->length > 3) {
940 return -EINVAL;
941 } else if (rinfo->prefix_len > 128) {
942 return -EINVAL;
943 } else if (rinfo->prefix_len > 64) {
944 if (rinfo->length < 2) {
945 return -EINVAL;
946 }
947 } else if (rinfo->prefix_len > 0) {
948 if (rinfo->length < 1) {
949 return -EINVAL;
950 }
951 }
952
953 pref = rinfo->route_pref;
954 if (pref == ICMPV6_ROUTER_PREF_INVALID)
955 return -EINVAL;
956
957 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
958
959 if (rinfo->length == 3)
960 prefix = (struct in6_addr *)rinfo->prefix;
961 else {
962
963 ipv6_addr_prefix(&prefix_buf,
964 (struct in6_addr *)rinfo->prefix,
965 rinfo->prefix_len);
966 prefix = &prefix_buf;
967 }
968
969 if (rinfo->prefix_len == 0)
970 rt = rt6_get_dflt_router(net, gwaddr, dev);
971 else
972 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
973 gwaddr, dev);
974
975 if (rt && !lifetime) {
976 ip6_del_rt(net, rt, false);
977 rt = NULL;
978 }
979
980 if (!rt && lifetime)
981 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
982 dev, pref);
983 else if (rt)
984 rt->fib6_flags = RTF_ROUTEINFO |
985 (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
986
987 if (rt) {
988 if (!addrconf_finite_timeout(lifetime))
989 fib6_clean_expires(rt);
990 else
991 fib6_set_expires(rt, jiffies + HZ * lifetime);
992
993 fib6_info_release(rt);
994 }
995 return 0;
996}
997#endif
998
999
1000
1001
1002
1003
1004static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res)
1005{
1006 struct net_device *dev = res->nh->fib_nh_dev;
1007
1008 if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
1009
1010
1011
1012
1013 if (netif_is_l3_slave(dev) &&
1014 !rt6_need_strict(&res->f6i->fib6_dst.addr))
1015 dev = l3mdev_master_dev_rcu(dev);
1016 else if (!netif_is_l3_master(dev))
1017 dev = dev_net(dev)->loopback_dev;
1018
1019
1020
1021 }
1022
1023 return dev;
1024}
1025
1026static const int fib6_prop[RTN_MAX + 1] = {
1027 [RTN_UNSPEC] = 0,
1028 [RTN_UNICAST] = 0,
1029 [RTN_LOCAL] = 0,
1030 [RTN_BROADCAST] = 0,
1031 [RTN_ANYCAST] = 0,
1032 [RTN_MULTICAST] = 0,
1033 [RTN_BLACKHOLE] = -EINVAL,
1034 [RTN_UNREACHABLE] = -EHOSTUNREACH,
1035 [RTN_PROHIBIT] = -EACCES,
1036 [RTN_THROW] = -EAGAIN,
1037 [RTN_NAT] = -EINVAL,
1038 [RTN_XRESOLVE] = -EINVAL,
1039};
1040
1041static int ip6_rt_type_to_error(u8 fib6_type)
1042{
1043 return fib6_prop[fib6_type];
1044}
1045
1046static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
1047{
1048 unsigned short flags = 0;
1049
1050 if (rt->dst_nocount)
1051 flags |= DST_NOCOUNT;
1052 if (rt->dst_nopolicy)
1053 flags |= DST_NOPOLICY;
1054
1055 return flags;
1056}
1057
1058static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type)
1059{
1060 rt->dst.error = ip6_rt_type_to_error(fib6_type);
1061
1062 switch (fib6_type) {
1063 case RTN_BLACKHOLE:
1064 rt->dst.output = dst_discard_out;
1065 rt->dst.input = dst_discard;
1066 break;
1067 case RTN_PROHIBIT:
1068 rt->dst.output = ip6_pkt_prohibit_out;
1069 rt->dst.input = ip6_pkt_prohibit;
1070 break;
1071 case RTN_THROW:
1072 case RTN_UNREACHABLE:
1073 default:
1074 rt->dst.output = ip6_pkt_discard_out;
1075 rt->dst.input = ip6_pkt_discard;
1076 break;
1077 }
1078}
1079
1080static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res)
1081{
1082 struct fib6_info *f6i = res->f6i;
1083
1084 if (res->fib6_flags & RTF_REJECT) {
1085 ip6_rt_init_dst_reject(rt, res->fib6_type);
1086 return;
1087 }
1088
1089 rt->dst.error = 0;
1090 rt->dst.output = ip6_output;
1091
1092 if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) {
1093 rt->dst.input = ip6_input;
1094 } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
1095 rt->dst.input = ip6_mc_input;
1096 } else {
1097 rt->dst.input = ip6_forward;
1098 }
1099
1100 if (res->nh->fib_nh_lws) {
1101 rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);
1102 lwtunnel_set_redirect(&rt->dst);
1103 }
1104
1105 rt->dst.lastuse = jiffies;
1106}
1107
1108
1109static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
1110{
1111 rt->rt6i_flags &= ~RTF_EXPIRES;
1112 rcu_assign_pointer(rt->from, from);
1113 ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
1114}
1115
1116
1117static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res)
1118{
1119 const struct fib6_nh *nh = res->nh;
1120 const struct net_device *dev = nh->fib_nh_dev;
1121 struct fib6_info *f6i = res->f6i;
1122
1123 ip6_rt_init_dst(rt, res);
1124
1125 rt->rt6i_dst = f6i->fib6_dst;
1126 rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
1127 rt->rt6i_flags = res->fib6_flags;
1128 if (nh->fib_nh_gw_family) {
1129 rt->rt6i_gateway = nh->fib_nh_gw6;
1130 rt->rt6i_flags |= RTF_GATEWAY;
1131 }
1132 rt6_set_from(rt, f6i);
1133#ifdef CONFIG_IPV6_SUBTREES
1134 rt->rt6i_src = f6i->fib6_src;
1135#endif
1136}
1137
1138static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
1139 struct in6_addr *saddr)
1140{
1141 struct fib6_node *pn, *sn;
1142 while (1) {
1143 if (fn->fn_flags & RTN_TL_ROOT)
1144 return NULL;
1145 pn = rcu_dereference(fn->parent);
1146 sn = FIB6_SUBTREE(pn);
1147 if (sn && sn != fn)
1148 fn = fib6_node_lookup(sn, NULL, saddr);
1149 else
1150 fn = pn;
1151 if (fn->fn_flags & RTN_RTINFO)
1152 return fn;
1153 }
1154}
1155
1156static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
1157{
1158 struct rt6_info *rt = *prt;
1159
1160 if (dst_hold_safe(&rt->dst))
1161 return true;
1162 if (net) {
1163 rt = net->ipv6.ip6_null_entry;
1164 dst_hold(&rt->dst);
1165 } else {
1166 rt = NULL;
1167 }
1168 *prt = rt;
1169 return false;
1170}
1171
1172
1173static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res)
1174{
1175 struct net_device *dev = res->nh->fib_nh_dev;
1176 struct fib6_info *f6i = res->f6i;
1177 unsigned short flags;
1178 struct rt6_info *nrt;
1179
1180 if (!fib6_info_hold_safe(f6i))
1181 goto fallback;
1182
1183 flags = fib6_info_dst_flags(f6i);
1184 nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
1185 if (!nrt) {
1186 fib6_info_release(f6i);
1187 goto fallback;
1188 }
1189
1190 ip6_rt_copy_init(nrt, res);
1191 return nrt;
1192
1193fallback:
1194 nrt = dev_net(dev)->ipv6.ip6_null_entry;
1195 dst_hold(&nrt->dst);
1196 return nrt;
1197}
1198
1199INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_lookup(struct net *net,
1200 struct fib6_table *table,
1201 struct flowi6 *fl6,
1202 const struct sk_buff *skb,
1203 int flags)
1204{
1205 struct fib6_result res = {};
1206 struct fib6_node *fn;
1207 struct rt6_info *rt;
1208
1209 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1210 flags &= ~RT6_LOOKUP_F_IFACE;
1211
1212 rcu_read_lock();
1213 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1214restart:
1215 res.f6i = rcu_dereference(fn->leaf);
1216 if (!res.f6i)
1217 res.f6i = net->ipv6.fib6_null_entry;
1218 else
1219 rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif,
1220 flags);
1221
1222 if (res.f6i == net->ipv6.fib6_null_entry) {
1223 fn = fib6_backtrack(fn, &fl6->saddr);
1224 if (fn)
1225 goto restart;
1226
1227 rt = net->ipv6.ip6_null_entry;
1228 dst_hold(&rt->dst);
1229 goto out;
1230 } else if (res.fib6_flags & RTF_REJECT) {
1231 goto do_create;
1232 }
1233
1234 fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
1235 fl6->flowi6_oif != 0, skb, flags);
1236
1237
1238 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
1239 if (rt) {
1240 if (ip6_hold_safe(net, &rt))
1241 dst_use_noref(&rt->dst, jiffies);
1242 } else {
1243do_create:
1244 rt = ip6_create_rt_rcu(&res);
1245 }
1246
1247out:
1248 trace_fib6_table_lookup(net, &res, table, fl6);
1249
1250 rcu_read_unlock();
1251
1252 return rt;
1253}
1254
1255struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
1256 const struct sk_buff *skb, int flags)
1257{
1258 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
1259}
1260EXPORT_SYMBOL_GPL(ip6_route_lookup);
1261
1262struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
1263 const struct in6_addr *saddr, int oif,
1264 const struct sk_buff *skb, int strict)
1265{
1266 struct flowi6 fl6 = {
1267 .flowi6_oif = oif,
1268 .daddr = *daddr,
1269 };
1270 struct dst_entry *dst;
1271 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
1272
1273 if (saddr) {
1274 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
1275 flags |= RT6_LOOKUP_F_HAS_SADDR;
1276 }
1277
1278 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
1279 if (dst->error == 0)
1280 return (struct rt6_info *) dst;
1281
1282 dst_release(dst);
1283
1284 return NULL;
1285}
1286EXPORT_SYMBOL(rt6_lookup);
1287
1288
1289
1290
1291
1292
1293
1294static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
1295 struct netlink_ext_ack *extack)
1296{
1297 int err;
1298 struct fib6_table *table;
1299
1300 table = rt->fib6_table;
1301 spin_lock_bh(&table->tb6_lock);
1302 err = fib6_add(&table->tb6_root, rt, info, extack);
1303 spin_unlock_bh(&table->tb6_lock);
1304
1305 return err;
1306}
1307
1308int ip6_ins_rt(struct net *net, struct fib6_info *rt)
1309{
1310 struct nl_info info = { .nl_net = net, };
1311
1312 return __ip6_ins_rt(rt, &info, NULL);
1313}
1314
1315static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
1316 const struct in6_addr *daddr,
1317 const struct in6_addr *saddr)
1318{
1319 struct fib6_info *f6i = res->f6i;
1320 struct net_device *dev;
1321 struct rt6_info *rt;
1322
1323
1324
1325
1326
1327 if (!fib6_info_hold_safe(f6i))
1328 return NULL;
1329
1330 dev = ip6_rt_get_dev_rcu(res);
1331 rt = ip6_dst_alloc(dev_net(dev), dev, 0);
1332 if (!rt) {
1333 fib6_info_release(f6i);
1334 return NULL;
1335 }
1336
1337 ip6_rt_copy_init(rt, res);
1338 rt->rt6i_flags |= RTF_CACHE;
1339 rt->rt6i_dst.addr = *daddr;
1340 rt->rt6i_dst.plen = 128;
1341
1342 if (!rt6_is_gw_or_nonexthop(res)) {
1343 if (f6i->fib6_dst.plen != 128 &&
1344 ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
1345 rt->rt6i_flags |= RTF_ANYCAST;
1346#ifdef CONFIG_IPV6_SUBTREES
1347 if (rt->rt6i_src.plen && saddr) {
1348 rt->rt6i_src.addr = *saddr;
1349 rt->rt6i_src.plen = 128;
1350 }
1351#endif
1352 }
1353
1354 return rt;
1355}
1356
1357static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res)
1358{
1359 struct fib6_info *f6i = res->f6i;
1360 unsigned short flags = fib6_info_dst_flags(f6i);
1361 struct net_device *dev;
1362 struct rt6_info *pcpu_rt;
1363
1364 if (!fib6_info_hold_safe(f6i))
1365 return NULL;
1366
1367 rcu_read_lock();
1368 dev = ip6_rt_get_dev_rcu(res);
1369 pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags | DST_NOCOUNT);
1370 rcu_read_unlock();
1371 if (!pcpu_rt) {
1372 fib6_info_release(f6i);
1373 return NULL;
1374 }
1375 ip6_rt_copy_init(pcpu_rt, res);
1376 pcpu_rt->rt6i_flags |= RTF_PCPU;
1377
1378 if (f6i->nh)
1379 pcpu_rt->sernum = rt_genid_ipv6(dev_net(dev));
1380
1381 return pcpu_rt;
1382}
1383
1384static bool rt6_is_valid(const struct rt6_info *rt6)
1385{
1386 return rt6->sernum == rt_genid_ipv6(dev_net(rt6->dst.dev));
1387}
1388
1389
1390static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
1391{
1392 struct rt6_info *pcpu_rt;
1393
1394 pcpu_rt = this_cpu_read(*res->nh->rt6i_pcpu);
1395
1396 if (pcpu_rt && pcpu_rt->sernum && !rt6_is_valid(pcpu_rt)) {
1397 struct rt6_info *prev, **p;
1398
1399 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1400 prev = xchg(p, NULL);
1401 if (prev) {
1402 dst_dev_put(&prev->dst);
1403 dst_release(&prev->dst);
1404 }
1405
1406 pcpu_rt = NULL;
1407 }
1408
1409 return pcpu_rt;
1410}
1411
1412static struct rt6_info *rt6_make_pcpu_route(struct net *net,
1413 const struct fib6_result *res)
1414{
1415 struct rt6_info *pcpu_rt, *prev, **p;
1416
1417 pcpu_rt = ip6_rt_pcpu_alloc(res);
1418 if (!pcpu_rt)
1419 return NULL;
1420
1421 p = this_cpu_ptr(res->nh->rt6i_pcpu);
1422 prev = cmpxchg(p, NULL, pcpu_rt);
1423 BUG_ON(prev);
1424
1425 if (res->f6i->fib6_destroying) {
1426 struct fib6_info *from;
1427
1428 from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL);
1429 fib6_info_release(from);
1430 }
1431
1432 return pcpu_rt;
1433}
1434
1435
1436
1437static DEFINE_SPINLOCK(rt6_exception_lock);
1438
1439
1440
1441
1442static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1443 struct rt6_exception *rt6_ex)
1444{
1445 struct fib6_info *from;
1446 struct net *net;
1447
1448 if (!bucket || !rt6_ex)
1449 return;
1450
1451 net = dev_net(rt6_ex->rt6i->dst.dev);
1452 net->ipv6.rt6_stats->fib_rt_cache--;
1453
1454
1455
1456
1457 from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL);
1458 fib6_info_release(from);
1459 dst_dev_put(&rt6_ex->rt6i->dst);
1460
1461 hlist_del_rcu(&rt6_ex->hlist);
1462 dst_release(&rt6_ex->rt6i->dst);
1463 kfree_rcu(rt6_ex, rcu);
1464 WARN_ON_ONCE(!bucket->depth);
1465 bucket->depth--;
1466}
1467
1468
1469
1470
1471static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1472{
1473 struct rt6_exception *rt6_ex, *oldest = NULL;
1474
1475 if (!bucket)
1476 return;
1477
1478 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1479 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1480 oldest = rt6_ex;
1481 }
1482 rt6_remove_exception(bucket, oldest);
1483}
1484
1485static u32 rt6_exception_hash(const struct in6_addr *dst,
1486 const struct in6_addr *src)
1487{
1488 static siphash_key_t rt6_exception_key __read_mostly;
1489 struct {
1490 struct in6_addr dst;
1491 struct in6_addr src;
1492 } __aligned(SIPHASH_ALIGNMENT) combined = {
1493 .dst = *dst,
1494 };
1495 u64 val;
1496
1497 net_get_random_once(&rt6_exception_key, sizeof(rt6_exception_key));
1498
1499#ifdef CONFIG_IPV6_SUBTREES
1500 if (src)
1501 combined.src = *src;
1502#endif
1503 val = siphash(&combined, sizeof(combined), &rt6_exception_key);
1504
1505 return hash_64(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
1506}
1507
1508
1509
1510
1511
1512
1513static struct rt6_exception *
1514__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1515 const struct in6_addr *daddr,
1516 const struct in6_addr *saddr)
1517{
1518 struct rt6_exception *rt6_ex;
1519 u32 hval;
1520
1521 if (!(*bucket) || !daddr)
1522 return NULL;
1523
1524 hval = rt6_exception_hash(daddr, saddr);
1525 *bucket += hval;
1526
1527 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1528 struct rt6_info *rt6 = rt6_ex->rt6i;
1529 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1530
1531#ifdef CONFIG_IPV6_SUBTREES
1532 if (matched && saddr)
1533 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1534#endif
1535 if (matched)
1536 return rt6_ex;
1537 }
1538 return NULL;
1539}
1540
1541
1542
1543
1544
1545
1546static struct rt6_exception *
1547__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1548 const struct in6_addr *daddr,
1549 const struct in6_addr *saddr)
1550{
1551 struct rt6_exception *rt6_ex;
1552 u32 hval;
1553
1554 WARN_ON_ONCE(!rcu_read_lock_held());
1555
1556 if (!(*bucket) || !daddr)
1557 return NULL;
1558
1559 hval = rt6_exception_hash(daddr, saddr);
1560 *bucket += hval;
1561
1562 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1563 struct rt6_info *rt6 = rt6_ex->rt6i;
1564 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1565
1566#ifdef CONFIG_IPV6_SUBTREES
1567 if (matched && saddr)
1568 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1569#endif
1570 if (matched)
1571 return rt6_ex;
1572 }
1573 return NULL;
1574}
1575
1576static unsigned int fib6_mtu(const struct fib6_result *res)
1577{
1578 const struct fib6_nh *nh = res->nh;
1579 unsigned int mtu;
1580
1581 if (res->f6i->fib6_pmtu) {
1582 mtu = res->f6i->fib6_pmtu;
1583 } else {
1584 struct net_device *dev = nh->fib_nh_dev;
1585 struct inet6_dev *idev;
1586
1587 rcu_read_lock();
1588 idev = __in6_dev_get(dev);
1589 mtu = idev->cnf.mtu6;
1590 rcu_read_unlock();
1591 }
1592
1593 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1594
1595 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
1596}
1597
1598#define FIB6_EXCEPTION_BUCKET_FLUSHED 0x1UL
1599
1600
1601
1602
1603
1604
1605static
1606struct rt6_exception_bucket *fib6_nh_get_excptn_bucket(const struct fib6_nh *nh,
1607 spinlock_t *lock)
1608{
1609 struct rt6_exception_bucket *bucket;
1610
1611 if (lock)
1612 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1613 lockdep_is_held(lock));
1614 else
1615 bucket = rcu_dereference(nh->rt6i_exception_bucket);
1616
1617
1618 if (bucket) {
1619 unsigned long p = (unsigned long)bucket;
1620
1621 p &= ~FIB6_EXCEPTION_BUCKET_FLUSHED;
1622 bucket = (struct rt6_exception_bucket *)p;
1623 }
1624
1625 return bucket;
1626}
1627
1628static bool fib6_nh_excptn_bucket_flushed(struct rt6_exception_bucket *bucket)
1629{
1630 unsigned long p = (unsigned long)bucket;
1631
1632 return !!(p & FIB6_EXCEPTION_BUCKET_FLUSHED);
1633}
1634
1635
1636static void fib6_nh_excptn_bucket_set_flushed(struct fib6_nh *nh,
1637 spinlock_t *lock)
1638{
1639 struct rt6_exception_bucket *bucket;
1640 unsigned long p;
1641
1642 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1643 lockdep_is_held(lock));
1644
1645 p = (unsigned long)bucket;
1646 p |= FIB6_EXCEPTION_BUCKET_FLUSHED;
1647 bucket = (struct rt6_exception_bucket *)p;
1648 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1649}
1650
1651static int rt6_insert_exception(struct rt6_info *nrt,
1652 const struct fib6_result *res)
1653{
1654 struct net *net = dev_net(nrt->dst.dev);
1655 struct rt6_exception_bucket *bucket;
1656 struct fib6_info *f6i = res->f6i;
1657 struct in6_addr *src_key = NULL;
1658 struct rt6_exception *rt6_ex;
1659 struct fib6_nh *nh = res->nh;
1660 int max_depth;
1661 int err = 0;
1662
1663 spin_lock_bh(&rt6_exception_lock);
1664
1665 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1666 lockdep_is_held(&rt6_exception_lock));
1667 if (!bucket) {
1668 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1669 GFP_ATOMIC);
1670 if (!bucket) {
1671 err = -ENOMEM;
1672 goto out;
1673 }
1674 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1675 } else if (fib6_nh_excptn_bucket_flushed(bucket)) {
1676 err = -EINVAL;
1677 goto out;
1678 }
1679
1680#ifdef CONFIG_IPV6_SUBTREES
1681
1682
1683
1684
1685
1686
1687 if (f6i->fib6_src.plen)
1688 src_key = &nrt->rt6i_src.addr;
1689#endif
1690
1691
1692
1693
1694 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
1695 err = -EINVAL;
1696 goto out;
1697 }
1698
1699 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1700 src_key);
1701 if (rt6_ex)
1702 rt6_remove_exception(bucket, rt6_ex);
1703
1704 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1705 if (!rt6_ex) {
1706 err = -ENOMEM;
1707 goto out;
1708 }
1709 rt6_ex->rt6i = nrt;
1710 rt6_ex->stamp = jiffies;
1711 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1712 bucket->depth++;
1713 net->ipv6.rt6_stats->fib_rt_cache++;
1714
1715
1716 max_depth = FIB6_MAX_DEPTH + prandom_u32_max(FIB6_MAX_DEPTH);
1717 while (bucket->depth > max_depth)
1718 rt6_exception_remove_oldest(bucket);
1719
1720out:
1721 spin_unlock_bh(&rt6_exception_lock);
1722
1723
1724 if (!err) {
1725 spin_lock_bh(&f6i->fib6_table->tb6_lock);
1726 fib6_update_sernum(net, f6i);
1727 spin_unlock_bh(&f6i->fib6_table->tb6_lock);
1728 fib6_force_start_gc(net);
1729 }
1730
1731 return err;
1732}
1733
1734static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from)
1735{
1736 struct rt6_exception_bucket *bucket;
1737 struct rt6_exception *rt6_ex;
1738 struct hlist_node *tmp;
1739 int i;
1740
1741 spin_lock_bh(&rt6_exception_lock);
1742
1743 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1744 if (!bucket)
1745 goto out;
1746
1747
1748 if (!from)
1749 fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock);
1750
1751 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1752 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) {
1753 if (!from ||
1754 rcu_access_pointer(rt6_ex->rt6i->from) == from)
1755 rt6_remove_exception(bucket, rt6_ex);
1756 }
1757 WARN_ON_ONCE(!from && bucket->depth);
1758 bucket++;
1759 }
1760out:
1761 spin_unlock_bh(&rt6_exception_lock);
1762}
1763
1764static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg)
1765{
1766 struct fib6_info *f6i = arg;
1767
1768 fib6_nh_flush_exceptions(nh, f6i);
1769
1770 return 0;
1771}
1772
1773void rt6_flush_exceptions(struct fib6_info *f6i)
1774{
1775 if (f6i->nh)
1776 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions,
1777 f6i);
1778 else
1779 fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
1780}
1781
1782
1783
1784
1785static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
1786 const struct in6_addr *daddr,
1787 const struct in6_addr *saddr)
1788{
1789 const struct in6_addr *src_key = NULL;
1790 struct rt6_exception_bucket *bucket;
1791 struct rt6_exception *rt6_ex;
1792 struct rt6_info *ret = NULL;
1793
1794#ifdef CONFIG_IPV6_SUBTREES
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806 if (res->f6i->fib6_src.plen)
1807 src_key = saddr;
1808find_ex:
1809#endif
1810 bucket = fib6_nh_get_excptn_bucket(res->nh, NULL);
1811 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1812
1813 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
1814 ret = rt6_ex->rt6i;
1815
1816#ifdef CONFIG_IPV6_SUBTREES
1817
1818 if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) {
1819 src_key = &res->f6i->fib6_src.addr;
1820 goto find_ex;
1821 }
1822#endif
1823
1824 return ret;
1825}
1826
1827
1828static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen,
1829 const struct rt6_info *rt)
1830{
1831 const struct in6_addr *src_key = NULL;
1832 struct rt6_exception_bucket *bucket;
1833 struct rt6_exception *rt6_ex;
1834 int err;
1835
1836 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
1837 return -ENOENT;
1838
1839 spin_lock_bh(&rt6_exception_lock);
1840 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1841
1842#ifdef CONFIG_IPV6_SUBTREES
1843
1844
1845
1846
1847
1848
1849 if (plen)
1850 src_key = &rt->rt6i_src.addr;
1851#endif
1852 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1853 &rt->rt6i_dst.addr,
1854 src_key);
1855 if (rt6_ex) {
1856 rt6_remove_exception(bucket, rt6_ex);
1857 err = 0;
1858 } else {
1859 err = -ENOENT;
1860 }
1861
1862 spin_unlock_bh(&rt6_exception_lock);
1863 return err;
1864}
1865
1866struct fib6_nh_excptn_arg {
1867 struct rt6_info *rt;
1868 int plen;
1869};
1870
1871static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg)
1872{
1873 struct fib6_nh_excptn_arg *arg = _arg;
1874 int err;
1875
1876 err = fib6_nh_remove_exception(nh, arg->plen, arg->rt);
1877 if (err == 0)
1878 return 1;
1879
1880 return 0;
1881}
1882
1883static int rt6_remove_exception_rt(struct rt6_info *rt)
1884{
1885 struct fib6_info *from;
1886
1887 from = rcu_dereference(rt->from);
1888 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1889 return -EINVAL;
1890
1891 if (from->nh) {
1892 struct fib6_nh_excptn_arg arg = {
1893 .rt = rt,
1894 .plen = from->fib6_src.plen
1895 };
1896 int rc;
1897
1898
1899 rc = nexthop_for_each_fib6_nh(from->nh,
1900 rt6_nh_remove_exception_rt,
1901 &arg);
1902 return rc ? 0 : -ENOENT;
1903 }
1904
1905 return fib6_nh_remove_exception(from->fib6_nh,
1906 from->fib6_src.plen, rt);
1907}
1908
1909
1910
1911
1912static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen,
1913 const struct rt6_info *rt)
1914{
1915 const struct in6_addr *src_key = NULL;
1916 struct rt6_exception_bucket *bucket;
1917 struct rt6_exception *rt6_ex;
1918
1919 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
1920#ifdef CONFIG_IPV6_SUBTREES
1921
1922
1923
1924
1925
1926
1927 if (plen)
1928 src_key = &rt->rt6i_src.addr;
1929#endif
1930 rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key);
1931 if (rt6_ex)
1932 rt6_ex->stamp = jiffies;
1933}
1934
1935struct fib6_nh_match_arg {
1936 const struct net_device *dev;
1937 const struct in6_addr *gw;
1938 struct fib6_nh *match;
1939};
1940
1941
1942static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg)
1943{
1944 struct fib6_nh_match_arg *arg = _arg;
1945
1946 if (arg->dev != nh->fib_nh_dev ||
1947 (arg->gw && !nh->fib_nh_gw_family) ||
1948 (!arg->gw && nh->fib_nh_gw_family) ||
1949 (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6)))
1950 return 0;
1951
1952 arg->match = nh;
1953
1954
1955 return 1;
1956}
1957
1958static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1959{
1960 struct fib6_info *from;
1961 struct fib6_nh *fib6_nh;
1962
1963 rcu_read_lock();
1964
1965 from = rcu_dereference(rt->from);
1966 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1967 goto unlock;
1968
1969 if (from->nh) {
1970 struct fib6_nh_match_arg arg = {
1971 .dev = rt->dst.dev,
1972 .gw = &rt->rt6i_gateway,
1973 };
1974
1975 nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
1976
1977 if (!arg.match)
1978 goto unlock;
1979 fib6_nh = arg.match;
1980 } else {
1981 fib6_nh = from->fib6_nh;
1982 }
1983 fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt);
1984unlock:
1985 rcu_read_unlock();
1986}
1987
1988static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1989 struct rt6_info *rt, int mtu)
1990{
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001 if (dst_mtu(&rt->dst) >= mtu)
2002 return true;
2003
2004 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
2005 return true;
2006
2007 return false;
2008}
2009
2010static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
2011 const struct fib6_nh *nh, int mtu)
2012{
2013 struct rt6_exception_bucket *bucket;
2014 struct rt6_exception *rt6_ex;
2015 int i;
2016
2017 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2018 if (!bucket)
2019 return;
2020
2021 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2022 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
2023 struct rt6_info *entry = rt6_ex->rt6i;
2024
2025
2026
2027
2028
2029 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
2030 rt6_mtu_change_route_allowed(idev, entry, mtu))
2031 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
2032 }
2033 bucket++;
2034 }
2035}
2036
2037#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2038
2039static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh,
2040 const struct in6_addr *gateway)
2041{
2042 struct rt6_exception_bucket *bucket;
2043 struct rt6_exception *rt6_ex;
2044 struct hlist_node *tmp;
2045 int i;
2046
2047 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
2048 return;
2049
2050 spin_lock_bh(&rt6_exception_lock);
2051 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2052 if (bucket) {
2053 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2054 hlist_for_each_entry_safe(rt6_ex, tmp,
2055 &bucket->chain, hlist) {
2056 struct rt6_info *entry = rt6_ex->rt6i;
2057
2058 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
2059 RTF_CACHE_GATEWAY &&
2060 ipv6_addr_equal(gateway,
2061 &entry->rt6i_gateway)) {
2062 rt6_remove_exception(bucket, rt6_ex);
2063 }
2064 }
2065 bucket++;
2066 }
2067 }
2068
2069 spin_unlock_bh(&rt6_exception_lock);
2070}
2071
2072static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
2073 struct rt6_exception *rt6_ex,
2074 struct fib6_gc_args *gc_args,
2075 unsigned long now)
2076{
2077 struct rt6_info *rt = rt6_ex->rt6i;
2078
2079
2080
2081
2082
2083
2084
2085 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
2086 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
2087 RT6_TRACE("aging clone %p\n", rt);
2088 rt6_remove_exception(bucket, rt6_ex);
2089 return;
2090 }
2091 } else if (time_after(jiffies, rt->dst.expires)) {
2092 RT6_TRACE("purging expired route %p\n", rt);
2093 rt6_remove_exception(bucket, rt6_ex);
2094 return;
2095 }
2096
2097 if (rt->rt6i_flags & RTF_GATEWAY) {
2098 struct neighbour *neigh;
2099
2100 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
2101
2102 if (!(neigh && (neigh->flags & NTF_ROUTER))) {
2103 RT6_TRACE("purging route %p via non-router but gateway\n",
2104 rt);
2105 rt6_remove_exception(bucket, rt6_ex);
2106 return;
2107 }
2108 }
2109
2110 gc_args->more++;
2111}
2112
2113static void fib6_nh_age_exceptions(const struct fib6_nh *nh,
2114 struct fib6_gc_args *gc_args,
2115 unsigned long now)
2116{
2117 struct rt6_exception_bucket *bucket;
2118 struct rt6_exception *rt6_ex;
2119 struct hlist_node *tmp;
2120 int i;
2121
2122 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
2123 return;
2124
2125 rcu_read_lock_bh();
2126 spin_lock(&rt6_exception_lock);
2127 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2128 if (bucket) {
2129 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2130 hlist_for_each_entry_safe(rt6_ex, tmp,
2131 &bucket->chain, hlist) {
2132 rt6_age_examine_exception(bucket, rt6_ex,
2133 gc_args, now);
2134 }
2135 bucket++;
2136 }
2137 }
2138 spin_unlock(&rt6_exception_lock);
2139 rcu_read_unlock_bh();
2140}
2141
2142struct fib6_nh_age_excptn_arg {
2143 struct fib6_gc_args *gc_args;
2144 unsigned long now;
2145};
2146
2147static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg)
2148{
2149 struct fib6_nh_age_excptn_arg *arg = _arg;
2150
2151 fib6_nh_age_exceptions(nh, arg->gc_args, arg->now);
2152 return 0;
2153}
2154
2155void rt6_age_exceptions(struct fib6_info *f6i,
2156 struct fib6_gc_args *gc_args,
2157 unsigned long now)
2158{
2159 if (f6i->nh) {
2160 struct fib6_nh_age_excptn_arg arg = {
2161 .gc_args = gc_args,
2162 .now = now
2163 };
2164
2165 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions,
2166 &arg);
2167 } else {
2168 fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
2169 }
2170}
2171
2172
2173int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
2174 struct flowi6 *fl6, struct fib6_result *res, int strict)
2175{
2176 struct fib6_node *fn, *saved_fn;
2177
2178 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
2179 saved_fn = fn;
2180
2181 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2182 oif = 0;
2183
2184redo_rt6_select:
2185 rt6_select(net, fn, oif, res, strict);
2186 if (res->f6i == net->ipv6.fib6_null_entry) {
2187 fn = fib6_backtrack(fn, &fl6->saddr);
2188 if (fn)
2189 goto redo_rt6_select;
2190 else if (strict & RT6_LOOKUP_F_REACHABLE) {
2191
2192 strict &= ~RT6_LOOKUP_F_REACHABLE;
2193 fn = saved_fn;
2194 goto redo_rt6_select;
2195 }
2196 }
2197
2198 trace_fib6_table_lookup(net, res, table, fl6);
2199
2200 return 0;
2201}
2202
2203struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
2204 int oif, struct flowi6 *fl6,
2205 const struct sk_buff *skb, int flags)
2206{
2207 struct fib6_result res = {};
2208 struct rt6_info *rt = NULL;
2209 int strict = 0;
2210
2211 WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) &&
2212 !rcu_read_lock_held());
2213
2214 strict |= flags & RT6_LOOKUP_F_IFACE;
2215 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
2216 if (net->ipv6.devconf_all->forwarding == 0)
2217 strict |= RT6_LOOKUP_F_REACHABLE;
2218
2219 rcu_read_lock();
2220
2221 fib6_table_lookup(net, table, oif, fl6, &res, strict);
2222 if (res.f6i == net->ipv6.fib6_null_entry)
2223 goto out;
2224
2225 fib6_select_path(net, &res, fl6, oif, false, skb, strict);
2226
2227
2228 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
2229 if (rt) {
2230 goto out;
2231 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
2232 !res.nh->fib_nh_gw_family)) {
2233
2234
2235
2236
2237
2238 rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
2239
2240 if (rt) {
2241
2242
2243
2244
2245
2246 rt6_uncached_list_add(rt);
2247 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
2248 rcu_read_unlock();
2249
2250 return rt;
2251 }
2252 } else {
2253
2254 local_bh_disable();
2255 rt = rt6_get_pcpu_route(&res);
2256
2257 if (!rt)
2258 rt = rt6_make_pcpu_route(net, &res);
2259
2260 local_bh_enable();
2261 }
2262out:
2263 if (!rt)
2264 rt = net->ipv6.ip6_null_entry;
2265 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
2266 ip6_hold_safe(net, &rt);
2267 rcu_read_unlock();
2268
2269 return rt;
2270}
2271EXPORT_SYMBOL_GPL(ip6_pol_route);
2272
2273INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net,
2274 struct fib6_table *table,
2275 struct flowi6 *fl6,
2276 const struct sk_buff *skb,
2277 int flags)
2278{
2279 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
2280}
2281
2282struct dst_entry *ip6_route_input_lookup(struct net *net,
2283 struct net_device *dev,
2284 struct flowi6 *fl6,
2285 const struct sk_buff *skb,
2286 int flags)
2287{
2288 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
2289 flags |= RT6_LOOKUP_F_IFACE;
2290
2291 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
2292}
2293EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
2294
2295static void ip6_multipath_l3_keys(const struct sk_buff *skb,
2296 struct flow_keys *keys,
2297 struct flow_keys *flkeys)
2298{
2299 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
2300 const struct ipv6hdr *key_iph = outer_iph;
2301 struct flow_keys *_flkeys = flkeys;
2302 const struct ipv6hdr *inner_iph;
2303 const struct icmp6hdr *icmph;
2304 struct ipv6hdr _inner_iph;
2305 struct icmp6hdr _icmph;
2306
2307 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
2308 goto out;
2309
2310 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
2311 sizeof(_icmph), &_icmph);
2312 if (!icmph)
2313 goto out;
2314
2315 if (!icmpv6_is_err(icmph->icmp6_type))
2316 goto out;
2317
2318 inner_iph = skb_header_pointer(skb,
2319 skb_transport_offset(skb) + sizeof(*icmph),
2320 sizeof(_inner_iph), &_inner_iph);
2321 if (!inner_iph)
2322 goto out;
2323
2324 key_iph = inner_iph;
2325 _flkeys = NULL;
2326out:
2327 if (_flkeys) {
2328 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
2329 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
2330 keys->tags.flow_label = _flkeys->tags.flow_label;
2331 keys->basic.ip_proto = _flkeys->basic.ip_proto;
2332 } else {
2333 keys->addrs.v6addrs.src = key_iph->saddr;
2334 keys->addrs.v6addrs.dst = key_iph->daddr;
2335 keys->tags.flow_label = ip6_flowlabel(key_iph);
2336 keys->basic.ip_proto = key_iph->nexthdr;
2337 }
2338}
2339
2340static u32 rt6_multipath_custom_hash_outer(const struct net *net,
2341 const struct sk_buff *skb,
2342 bool *p_has_inner)
2343{
2344 u32 hash_fields = ip6_multipath_hash_fields(net);
2345 struct flow_keys keys, hash_keys;
2346
2347 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK))
2348 return 0;
2349
2350 memset(&hash_keys, 0, sizeof(hash_keys));
2351 skb_flow_dissect_flow_keys(skb, &keys, FLOW_DISSECTOR_F_STOP_AT_ENCAP);
2352
2353 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2354 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP)
2355 hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src;
2356 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP)
2357 hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst;
2358 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
2359 hash_keys.basic.ip_proto = keys.basic.ip_proto;
2360 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL)
2361 hash_keys.tags.flow_label = keys.tags.flow_label;
2362 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT)
2363 hash_keys.ports.src = keys.ports.src;
2364 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT)
2365 hash_keys.ports.dst = keys.ports.dst;
2366
2367 *p_has_inner = !!(keys.control.flags & FLOW_DIS_ENCAPSULATION);
2368 return flow_hash_from_keys(&hash_keys);
2369}
2370
2371static u32 rt6_multipath_custom_hash_inner(const struct net *net,
2372 const struct sk_buff *skb,
2373 bool has_inner)
2374{
2375 u32 hash_fields = ip6_multipath_hash_fields(net);
2376 struct flow_keys keys, hash_keys;
2377
2378
2379
2380
2381
2382 if (!has_inner)
2383 return 0;
2384
2385 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_MASK))
2386 return 0;
2387
2388 memset(&hash_keys, 0, sizeof(hash_keys));
2389 skb_flow_dissect_flow_keys(skb, &keys, 0);
2390
2391 if (!(keys.control.flags & FLOW_DIS_ENCAPSULATION))
2392 return 0;
2393
2394 if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2395 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2396 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP)
2397 hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src;
2398 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP)
2399 hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst;
2400 } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2401 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2402 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP)
2403 hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src;
2404 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP)
2405 hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst;
2406 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL)
2407 hash_keys.tags.flow_label = keys.tags.flow_label;
2408 }
2409
2410 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO)
2411 hash_keys.basic.ip_proto = keys.basic.ip_proto;
2412 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT)
2413 hash_keys.ports.src = keys.ports.src;
2414 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)
2415 hash_keys.ports.dst = keys.ports.dst;
2416
2417 return flow_hash_from_keys(&hash_keys);
2418}
2419
2420static u32 rt6_multipath_custom_hash_skb(const struct net *net,
2421 const struct sk_buff *skb)
2422{
2423 u32 mhash, mhash_inner;
2424 bool has_inner = true;
2425
2426 mhash = rt6_multipath_custom_hash_outer(net, skb, &has_inner);
2427 mhash_inner = rt6_multipath_custom_hash_inner(net, skb, has_inner);
2428
2429 return jhash_2words(mhash, mhash_inner, 0);
2430}
2431
2432static u32 rt6_multipath_custom_hash_fl6(const struct net *net,
2433 const struct flowi6 *fl6)
2434{
2435 u32 hash_fields = ip6_multipath_hash_fields(net);
2436 struct flow_keys hash_keys;
2437
2438 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK))
2439 return 0;
2440
2441 memset(&hash_keys, 0, sizeof(hash_keys));
2442 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2443 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP)
2444 hash_keys.addrs.v6addrs.src = fl6->saddr;
2445 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP)
2446 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2447 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
2448 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2449 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL)
2450 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2451 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT)
2452 hash_keys.ports.src = fl6->fl6_sport;
2453 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT)
2454 hash_keys.ports.dst = fl6->fl6_dport;
2455
2456 return flow_hash_from_keys(&hash_keys);
2457}
2458
2459
2460u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
2461 const struct sk_buff *skb, struct flow_keys *flkeys)
2462{
2463 struct flow_keys hash_keys;
2464 u32 mhash = 0;
2465
2466 switch (ip6_multipath_hash_policy(net)) {
2467 case 0:
2468 memset(&hash_keys, 0, sizeof(hash_keys));
2469 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2470 if (skb) {
2471 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2472 } else {
2473 hash_keys.addrs.v6addrs.src = fl6->saddr;
2474 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2475 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2476 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2477 }
2478 mhash = flow_hash_from_keys(&hash_keys);
2479 break;
2480 case 1:
2481 if (skb) {
2482 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
2483 struct flow_keys keys;
2484
2485
2486 if (skb->l4_hash)
2487 return skb_get_hash_raw(skb) >> 1;
2488
2489 memset(&hash_keys, 0, sizeof(hash_keys));
2490
2491 if (!flkeys) {
2492 skb_flow_dissect_flow_keys(skb, &keys, flag);
2493 flkeys = &keys;
2494 }
2495 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2496 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2497 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2498 hash_keys.ports.src = flkeys->ports.src;
2499 hash_keys.ports.dst = flkeys->ports.dst;
2500 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2501 } else {
2502 memset(&hash_keys, 0, sizeof(hash_keys));
2503 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2504 hash_keys.addrs.v6addrs.src = fl6->saddr;
2505 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2506 hash_keys.ports.src = fl6->fl6_sport;
2507 hash_keys.ports.dst = fl6->fl6_dport;
2508 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2509 }
2510 mhash = flow_hash_from_keys(&hash_keys);
2511 break;
2512 case 2:
2513 memset(&hash_keys, 0, sizeof(hash_keys));
2514 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2515 if (skb) {
2516 struct flow_keys keys;
2517
2518 if (!flkeys) {
2519 skb_flow_dissect_flow_keys(skb, &keys, 0);
2520 flkeys = &keys;
2521 }
2522
2523
2524 if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2525 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2526 hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src;
2527 hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst;
2528 } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2529 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2530 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2531 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2532 hash_keys.tags.flow_label = flkeys->tags.flow_label;
2533 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2534 } else {
2535
2536 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2537 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2538 }
2539 } else {
2540
2541 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2542 hash_keys.addrs.v6addrs.src = fl6->saddr;
2543 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2544 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2545 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2546 }
2547 mhash = flow_hash_from_keys(&hash_keys);
2548 break;
2549 case 3:
2550 if (skb)
2551 mhash = rt6_multipath_custom_hash_skb(net, skb);
2552 else
2553 mhash = rt6_multipath_custom_hash_fl6(net, fl6);
2554 break;
2555 }
2556
2557 return mhash >> 1;
2558}
2559
2560
2561void ip6_route_input(struct sk_buff *skb)
2562{
2563 const struct ipv6hdr *iph = ipv6_hdr(skb);
2564 struct net *net = dev_net(skb->dev);
2565 int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF;
2566 struct ip_tunnel_info *tun_info;
2567 struct flowi6 fl6 = {
2568 .flowi6_iif = skb->dev->ifindex,
2569 .daddr = iph->daddr,
2570 .saddr = iph->saddr,
2571 .flowlabel = ip6_flowinfo(iph),
2572 .flowi6_mark = skb->mark,
2573 .flowi6_proto = iph->nexthdr,
2574 };
2575 struct flow_keys *flkeys = NULL, _flkeys;
2576
2577 tun_info = skb_tunnel_info(skb);
2578 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
2579 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
2580
2581 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2582 flkeys = &_flkeys;
2583
2584 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
2585 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
2586 skb_dst_drop(skb);
2587 skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev,
2588 &fl6, skb, flags));
2589}
2590
2591INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net,
2592 struct fib6_table *table,
2593 struct flowi6 *fl6,
2594 const struct sk_buff *skb,
2595 int flags)
2596{
2597 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
2598}
2599
2600struct dst_entry *ip6_route_output_flags_noref(struct net *net,
2601 const struct sock *sk,
2602 struct flowi6 *fl6, int flags)
2603{
2604 bool any_src;
2605
2606 if (ipv6_addr_type(&fl6->daddr) &
2607 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
2608 struct dst_entry *dst;
2609
2610
2611 dst = l3mdev_link_scope_lookup(net, fl6);
2612 if (dst)
2613 return dst;
2614 }
2615
2616 fl6->flowi6_iif = LOOPBACK_IFINDEX;
2617
2618 flags |= RT6_LOOKUP_F_DST_NOREF;
2619 any_src = ipv6_addr_any(&fl6->saddr);
2620 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
2621 (fl6->flowi6_oif && any_src))
2622 flags |= RT6_LOOKUP_F_IFACE;
2623
2624 if (!any_src)
2625 flags |= RT6_LOOKUP_F_HAS_SADDR;
2626 else if (sk)
2627 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
2628
2629 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
2630}
2631EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref);
2632
2633struct dst_entry *ip6_route_output_flags(struct net *net,
2634 const struct sock *sk,
2635 struct flowi6 *fl6,
2636 int flags)
2637{
2638 struct dst_entry *dst;
2639 struct rt6_info *rt6;
2640
2641 rcu_read_lock();
2642 dst = ip6_route_output_flags_noref(net, sk, fl6, flags);
2643 rt6 = (struct rt6_info *)dst;
2644
2645 if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) {
2646 dst = &net->ipv6.ip6_null_entry->dst;
2647 dst_hold(dst);
2648 }
2649 rcu_read_unlock();
2650
2651 return dst;
2652}
2653EXPORT_SYMBOL_GPL(ip6_route_output_flags);
2654
2655struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
2656{
2657 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
2658 struct net_device *loopback_dev = net->loopback_dev;
2659 struct dst_entry *new = NULL;
2660
2661 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
2662 DST_OBSOLETE_DEAD, 0);
2663 if (rt) {
2664 rt6_info_init(rt);
2665 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
2666
2667 new = &rt->dst;
2668 new->__use = 1;
2669 new->input = dst_discard;
2670 new->output = dst_discard_out;
2671
2672 dst_copy_metrics(new, &ort->dst);
2673
2674 rt->rt6i_idev = in6_dev_get(loopback_dev);
2675 rt->rt6i_gateway = ort->rt6i_gateway;
2676 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
2677
2678 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2679#ifdef CONFIG_IPV6_SUBTREES
2680 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2681#endif
2682 }
2683
2684 dst_release(dst_orig);
2685 return new ? new : ERR_PTR(-ENOMEM);
2686}
2687
2688
2689
2690
2691
2692static bool fib6_check(struct fib6_info *f6i, u32 cookie)
2693{
2694 u32 rt_cookie = 0;
2695
2696 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
2697 return false;
2698
2699 if (fib6_check_expired(f6i))
2700 return false;
2701
2702 return true;
2703}
2704
2705static struct dst_entry *rt6_check(struct rt6_info *rt,
2706 struct fib6_info *from,
2707 u32 cookie)
2708{
2709 u32 rt_cookie = 0;
2710
2711 if (!from || !fib6_get_cookie_safe(from, &rt_cookie) ||
2712 rt_cookie != cookie)
2713 return NULL;
2714
2715 if (rt6_check_expired(rt))
2716 return NULL;
2717
2718 return &rt->dst;
2719}
2720
2721static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2722 struct fib6_info *from,
2723 u32 cookie)
2724{
2725 if (!__rt6_check_expired(rt) &&
2726 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
2727 fib6_check(from, cookie))
2728 return &rt->dst;
2729 else
2730 return NULL;
2731}
2732
2733INDIRECT_CALLABLE_SCOPE struct dst_entry *ip6_dst_check(struct dst_entry *dst,
2734 u32 cookie)
2735{
2736 struct dst_entry *dst_ret;
2737 struct fib6_info *from;
2738 struct rt6_info *rt;
2739
2740 rt = container_of(dst, struct rt6_info, dst);
2741
2742 if (rt->sernum)
2743 return rt6_is_valid(rt) ? dst : NULL;
2744
2745 rcu_read_lock();
2746
2747
2748
2749
2750
2751
2752 from = rcu_dereference(rt->from);
2753
2754 if (from && (rt->rt6i_flags & RTF_PCPU ||
2755 unlikely(!list_empty(&rt->rt6i_uncached))))
2756 dst_ret = rt6_dst_from_check(rt, from, cookie);
2757 else
2758 dst_ret = rt6_check(rt, from, cookie);
2759
2760 rcu_read_unlock();
2761
2762 return dst_ret;
2763}
2764EXPORT_INDIRECT_CALLABLE(ip6_dst_check);
2765
2766static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2767{
2768 struct rt6_info *rt = (struct rt6_info *) dst;
2769
2770 if (rt) {
2771 if (rt->rt6i_flags & RTF_CACHE) {
2772 rcu_read_lock();
2773 if (rt6_check_expired(rt)) {
2774 rt6_remove_exception_rt(rt);
2775 dst = NULL;
2776 }
2777 rcu_read_unlock();
2778 } else {
2779 dst_release(dst);
2780 dst = NULL;
2781 }
2782 }
2783 return dst;
2784}
2785
2786static void ip6_link_failure(struct sk_buff *skb)
2787{
2788 struct rt6_info *rt;
2789
2790 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
2791
2792 rt = (struct rt6_info *) skb_dst(skb);
2793 if (rt) {
2794 rcu_read_lock();
2795 if (rt->rt6i_flags & RTF_CACHE) {
2796 rt6_remove_exception_rt(rt);
2797 } else {
2798 struct fib6_info *from;
2799 struct fib6_node *fn;
2800
2801 from = rcu_dereference(rt->from);
2802 if (from) {
2803 fn = rcu_dereference(from->fib6_node);
2804 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2805 fn->fn_sernum = -1;
2806 }
2807 }
2808 rcu_read_unlock();
2809 }
2810}
2811
2812static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2813{
2814 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2815 struct fib6_info *from;
2816
2817 rcu_read_lock();
2818 from = rcu_dereference(rt0->from);
2819 if (from)
2820 rt0->dst.expires = from->expires;
2821 rcu_read_unlock();
2822 }
2823
2824 dst_set_expires(&rt0->dst, timeout);
2825 rt0->rt6i_flags |= RTF_EXPIRES;
2826}
2827
2828static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2829{
2830 struct net *net = dev_net(rt->dst.dev);
2831
2832 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
2833 rt->rt6i_flags |= RTF_MODIFIED;
2834 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2835}
2836
2837static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2838{
2839 return !(rt->rt6i_flags & RTF_CACHE) &&
2840 (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
2841}
2842
2843static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
2844 const struct ipv6hdr *iph, u32 mtu,
2845 bool confirm_neigh)
2846{
2847 const struct in6_addr *daddr, *saddr;
2848 struct rt6_info *rt6 = (struct rt6_info *)dst;
2849
2850
2851
2852
2853
2854
2855 if (iph) {
2856 daddr = &iph->daddr;
2857 saddr = &iph->saddr;
2858 } else if (sk) {
2859 daddr = &sk->sk_v6_daddr;
2860 saddr = &inet6_sk(sk)->saddr;
2861 } else {
2862 daddr = NULL;
2863 saddr = NULL;
2864 }
2865
2866 if (confirm_neigh)
2867 dst_confirm_neigh(dst, daddr);
2868
2869 if (mtu < IPV6_MIN_MTU)
2870 return;
2871 if (mtu >= dst_mtu(dst))
2872 return;
2873
2874 if (!rt6_cache_allowed_for_pmtu(rt6)) {
2875 rt6_do_update_pmtu(rt6, mtu);
2876
2877 if (rt6->rt6i_flags & RTF_CACHE)
2878 rt6_update_exception_stamp_rt(rt6);
2879 } else if (daddr) {
2880 struct fib6_result res = {};
2881 struct rt6_info *nrt6;
2882
2883 rcu_read_lock();
2884 res.f6i = rcu_dereference(rt6->from);
2885 if (!res.f6i)
2886 goto out_unlock;
2887
2888 res.fib6_flags = res.f6i->fib6_flags;
2889 res.fib6_type = res.f6i->fib6_type;
2890
2891 if (res.f6i->nh) {
2892 struct fib6_nh_match_arg arg = {
2893 .dev = dst->dev,
2894 .gw = &rt6->rt6i_gateway,
2895 };
2896
2897 nexthop_for_each_fib6_nh(res.f6i->nh,
2898 fib6_nh_find_match, &arg);
2899
2900
2901
2902
2903 if (!arg.match)
2904 goto out_unlock;
2905
2906 res.nh = arg.match;
2907 } else {
2908 res.nh = res.f6i->fib6_nh;
2909 }
2910
2911 nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
2912 if (nrt6) {
2913 rt6_do_update_pmtu(nrt6, mtu);
2914 if (rt6_insert_exception(nrt6, &res))
2915 dst_release_immediate(&nrt6->dst);
2916 }
2917out_unlock:
2918 rcu_read_unlock();
2919 }
2920}
2921
2922static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
2923 struct sk_buff *skb, u32 mtu,
2924 bool confirm_neigh)
2925{
2926 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu,
2927 confirm_neigh);
2928}
2929
2930void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
2931 int oif, u32 mark, kuid_t uid)
2932{
2933 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2934 struct dst_entry *dst;
2935 struct flowi6 fl6 = {
2936 .flowi6_oif = oif,
2937 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2938 .daddr = iph->daddr,
2939 .saddr = iph->saddr,
2940 .flowlabel = ip6_flowinfo(iph),
2941 .flowi6_uid = uid,
2942 };
2943
2944 dst = ip6_route_output(net, NULL, &fl6);
2945 if (!dst->error)
2946 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true);
2947 dst_release(dst);
2948}
2949EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2950
2951void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2952{
2953 int oif = sk->sk_bound_dev_if;
2954 struct dst_entry *dst;
2955
2956 if (!oif && skb->dev)
2957 oif = l3mdev_master_ifindex(skb->dev);
2958
2959 ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
2960
2961 dst = __sk_dst_get(sk);
2962 if (!dst || !dst->obsolete ||
2963 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2964 return;
2965
2966 bh_lock_sock(sk);
2967 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2968 ip6_datagram_dst_update(sk, false);
2969 bh_unlock_sock(sk);
2970}
2971EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2972
2973void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2974 const struct flowi6 *fl6)
2975{
2976#ifdef CONFIG_IPV6_SUBTREES
2977 struct ipv6_pinfo *np = inet6_sk(sk);
2978#endif
2979
2980 ip6_dst_store(sk, dst,
2981 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2982 &sk->sk_v6_daddr : NULL,
2983#ifdef CONFIG_IPV6_SUBTREES
2984 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2985 &np->saddr :
2986#endif
2987 NULL);
2988}
2989
2990static bool ip6_redirect_nh_match(const struct fib6_result *res,
2991 struct flowi6 *fl6,
2992 const struct in6_addr *gw,
2993 struct rt6_info **ret)
2994{
2995 const struct fib6_nh *nh = res->nh;
2996
2997 if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
2998 fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
2999 return false;
3000
3001
3002
3003
3004
3005
3006 if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
3007 struct rt6_info *rt_cache;
3008
3009 rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
3010 if (rt_cache &&
3011 ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
3012 *ret = rt_cache;
3013 return true;
3014 }
3015 return false;
3016 }
3017 return true;
3018}
3019
3020struct fib6_nh_rd_arg {
3021 struct fib6_result *res;
3022 struct flowi6 *fl6;
3023 const struct in6_addr *gw;
3024 struct rt6_info **ret;
3025};
3026
3027static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg)
3028{
3029 struct fib6_nh_rd_arg *arg = _arg;
3030
3031 arg->res->nh = nh;
3032 return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret);
3033}
3034
3035
3036struct ip6rd_flowi {
3037 struct flowi6 fl6;
3038 struct in6_addr gateway;
3039};
3040
3041INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net,
3042 struct fib6_table *table,
3043 struct flowi6 *fl6,
3044 const struct sk_buff *skb,
3045 int flags)
3046{
3047 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
3048 struct rt6_info *ret = NULL;
3049 struct fib6_result res = {};
3050 struct fib6_nh_rd_arg arg = {
3051 .res = &res,
3052 .fl6 = fl6,
3053 .gw = &rdfl->gateway,
3054 .ret = &ret
3055 };
3056 struct fib6_info *rt;
3057 struct fib6_node *fn;
3058
3059
3060
3061
3062 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
3063 fl6->flowi6_oif = skb->dev->ifindex;
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075 rcu_read_lock();
3076 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
3077restart:
3078 for_each_fib6_node_rt_rcu(fn) {
3079 res.f6i = rt;
3080 if (fib6_check_expired(rt))
3081 continue;
3082 if (rt->fib6_flags & RTF_REJECT)
3083 break;
3084 if (unlikely(rt->nh)) {
3085 if (nexthop_is_blackhole(rt->nh))
3086 continue;
3087
3088 if (nexthop_for_each_fib6_nh(rt->nh,
3089 fib6_nh_redirect_match,
3090 &arg))
3091 goto out;
3092 } else {
3093 res.nh = rt->fib6_nh;
3094 if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway,
3095 &ret))
3096 goto out;
3097 }
3098 }
3099
3100 if (!rt)
3101 rt = net->ipv6.fib6_null_entry;
3102 else if (rt->fib6_flags & RTF_REJECT) {
3103 ret = net->ipv6.ip6_null_entry;
3104 goto out;
3105 }
3106
3107 if (rt == net->ipv6.fib6_null_entry) {
3108 fn = fib6_backtrack(fn, &fl6->saddr);
3109 if (fn)
3110 goto restart;
3111 }
3112
3113 res.f6i = rt;
3114 res.nh = rt->fib6_nh;
3115out:
3116 if (ret) {
3117 ip6_hold_safe(net, &ret);
3118 } else {
3119 res.fib6_flags = res.f6i->fib6_flags;
3120 res.fib6_type = res.f6i->fib6_type;
3121 ret = ip6_create_rt_rcu(&res);
3122 }
3123
3124 rcu_read_unlock();
3125
3126 trace_fib6_table_lookup(net, &res, table, fl6);
3127 return ret;
3128};
3129
3130static struct dst_entry *ip6_route_redirect(struct net *net,
3131 const struct flowi6 *fl6,
3132 const struct sk_buff *skb,
3133 const struct in6_addr *gateway)
3134{
3135 int flags = RT6_LOOKUP_F_HAS_SADDR;
3136 struct ip6rd_flowi rdfl;
3137
3138 rdfl.fl6 = *fl6;
3139 rdfl.gateway = *gateway;
3140
3141 return fib6_rule_lookup(net, &rdfl.fl6, skb,
3142 flags, __ip6_route_redirect);
3143}
3144
3145void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
3146 kuid_t uid)
3147{
3148 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
3149 struct dst_entry *dst;
3150 struct flowi6 fl6 = {
3151 .flowi6_iif = LOOPBACK_IFINDEX,
3152 .flowi6_oif = oif,
3153 .flowi6_mark = mark,
3154 .daddr = iph->daddr,
3155 .saddr = iph->saddr,
3156 .flowlabel = ip6_flowinfo(iph),
3157 .flowi6_uid = uid,
3158 };
3159
3160 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
3161 rt6_do_redirect(dst, NULL, skb);
3162 dst_release(dst);
3163}
3164EXPORT_SYMBOL_GPL(ip6_redirect);
3165
3166void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
3167{
3168 const struct ipv6hdr *iph = ipv6_hdr(skb);
3169 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
3170 struct dst_entry *dst;
3171 struct flowi6 fl6 = {
3172 .flowi6_iif = LOOPBACK_IFINDEX,
3173 .flowi6_oif = oif,
3174 .daddr = msg->dest,
3175 .saddr = iph->daddr,
3176 .flowi6_uid = sock_net_uid(net, NULL),
3177 };
3178
3179 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
3180 rt6_do_redirect(dst, NULL, skb);
3181 dst_release(dst);
3182}
3183
3184void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
3185{
3186 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
3187 sk->sk_uid);
3188}
3189EXPORT_SYMBOL_GPL(ip6_sk_redirect);
3190
3191static unsigned int ip6_default_advmss(const struct dst_entry *dst)
3192{
3193 struct net_device *dev = dst->dev;
3194 unsigned int mtu = dst_mtu(dst);
3195 struct net *net = dev_net(dev);
3196
3197 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
3198
3199 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
3200 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
3201
3202
3203
3204
3205
3206
3207
3208 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
3209 mtu = IPV6_MAXPLEN;
3210 return mtu;
3211}
3212
3213INDIRECT_CALLABLE_SCOPE unsigned int ip6_mtu(const struct dst_entry *dst)
3214{
3215 return ip6_dst_mtu_maybe_forward(dst, false);
3216}
3217EXPORT_INDIRECT_CALLABLE(ip6_mtu);
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227u32 ip6_mtu_from_fib6(const struct fib6_result *res,
3228 const struct in6_addr *daddr,
3229 const struct in6_addr *saddr)
3230{
3231 const struct fib6_nh *nh = res->nh;
3232 struct fib6_info *f6i = res->f6i;
3233 struct inet6_dev *idev;
3234 struct rt6_info *rt;
3235 u32 mtu = 0;
3236
3237 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
3238 mtu = f6i->fib6_pmtu;
3239 if (mtu)
3240 goto out;
3241 }
3242
3243 rt = rt6_find_cached_rt(res, daddr, saddr);
3244 if (unlikely(rt)) {
3245 mtu = dst_metric_raw(&rt->dst, RTAX_MTU);
3246 } else {
3247 struct net_device *dev = nh->fib_nh_dev;
3248
3249 mtu = IPV6_MIN_MTU;
3250 idev = __in6_dev_get(dev);
3251 if (idev && idev->cnf.mtu6 > mtu)
3252 mtu = idev->cnf.mtu6;
3253 }
3254
3255 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3256out:
3257 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
3258}
3259
3260struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
3261 struct flowi6 *fl6)
3262{
3263 struct dst_entry *dst;
3264 struct rt6_info *rt;
3265 struct inet6_dev *idev = in6_dev_get(dev);
3266 struct net *net = dev_net(dev);
3267
3268 if (unlikely(!idev))
3269 return ERR_PTR(-ENODEV);
3270
3271 rt = ip6_dst_alloc(net, dev, 0);
3272 if (unlikely(!rt)) {
3273 in6_dev_put(idev);
3274 dst = ERR_PTR(-ENOMEM);
3275 goto out;
3276 }
3277
3278 rt->dst.input = ip6_input;
3279 rt->dst.output = ip6_output;
3280 rt->rt6i_gateway = fl6->daddr;
3281 rt->rt6i_dst.addr = fl6->daddr;
3282 rt->rt6i_dst.plen = 128;
3283 rt->rt6i_idev = idev;
3284 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
3285
3286
3287
3288
3289 rt6_uncached_list_add(rt);
3290 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
3291
3292 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
3293
3294out:
3295 return dst;
3296}
3297
3298static int ip6_dst_gc(struct dst_ops *ops)
3299{
3300 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
3301 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
3302 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
3303 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
3304 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
3305 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
3306 int entries;
3307
3308 entries = dst_entries_get_fast(ops);
3309 if (entries > rt_max_size)
3310 entries = dst_entries_get_slow(ops);
3311
3312 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
3313 entries <= rt_max_size)
3314 goto out;
3315
3316 net->ipv6.ip6_rt_gc_expire++;
3317 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
3318 entries = dst_entries_get_slow(ops);
3319 if (entries < ops->gc_thresh)
3320 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
3321out:
3322 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
3323 return entries > rt_max_size;
3324}
3325
3326static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
3327 const struct in6_addr *gw_addr, u32 tbid,
3328 int flags, struct fib6_result *res)
3329{
3330 struct flowi6 fl6 = {
3331 .flowi6_oif = cfg->fc_ifindex,
3332 .daddr = *gw_addr,
3333 .saddr = cfg->fc_prefsrc,
3334 };
3335 struct fib6_table *table;
3336 int err;
3337
3338 table = fib6_get_table(net, tbid);
3339 if (!table)
3340 return -EINVAL;
3341
3342 if (!ipv6_addr_any(&cfg->fc_prefsrc))
3343 flags |= RT6_LOOKUP_F_HAS_SADDR;
3344
3345 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
3346
3347 err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags);
3348 if (!err && res->f6i != net->ipv6.fib6_null_entry)
3349 fib6_select_path(net, res, &fl6, cfg->fc_ifindex,
3350 cfg->fc_ifindex != 0, NULL, flags);
3351
3352 return err;
3353}
3354
3355static int ip6_route_check_nh_onlink(struct net *net,
3356 struct fib6_config *cfg,
3357 const struct net_device *dev,
3358 struct netlink_ext_ack *extack)
3359{
3360 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
3361 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3362 struct fib6_result res = {};
3363 int err;
3364
3365 err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res);
3366 if (!err && !(res.fib6_flags & RTF_REJECT) &&
3367
3368 !ipv6_addr_any(&res.f6i->fib6_dst.addr) &&
3369 (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) {
3370 NL_SET_ERR_MSG(extack,
3371 "Nexthop has invalid gateway or device mismatch");
3372 err = -EINVAL;
3373 }
3374
3375 return err;
3376}
3377
3378static int ip6_route_check_nh(struct net *net,
3379 struct fib6_config *cfg,
3380 struct net_device **_dev,
3381 struct inet6_dev **idev)
3382{
3383 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3384 struct net_device *dev = _dev ? *_dev : NULL;
3385 int flags = RT6_LOOKUP_F_IFACE;
3386 struct fib6_result res = {};
3387 int err = -EHOSTUNREACH;
3388
3389 if (cfg->fc_table) {
3390 err = ip6_nh_lookup_table(net, cfg, gw_addr,
3391 cfg->fc_table, flags, &res);
3392
3393
3394
3395 if (err || res.fib6_flags & RTF_REJECT ||
3396 res.nh->fib_nh_gw_family ||
3397 (dev && dev != res.nh->fib_nh_dev))
3398 err = -EHOSTUNREACH;
3399 }
3400
3401 if (err < 0) {
3402 struct flowi6 fl6 = {
3403 .flowi6_oif = cfg->fc_ifindex,
3404 .daddr = *gw_addr,
3405 };
3406
3407 err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags);
3408 if (err || res.fib6_flags & RTF_REJECT ||
3409 res.nh->fib_nh_gw_family)
3410 err = -EHOSTUNREACH;
3411
3412 if (err)
3413 return err;
3414
3415 fib6_select_path(net, &res, &fl6, cfg->fc_ifindex,
3416 cfg->fc_ifindex != 0, NULL, flags);
3417 }
3418
3419 err = 0;
3420 if (dev) {
3421 if (dev != res.nh->fib_nh_dev)
3422 err = -EHOSTUNREACH;
3423 } else {
3424 *_dev = dev = res.nh->fib_nh_dev;
3425 dev_hold(dev);
3426 *idev = in6_dev_get(dev);
3427 }
3428
3429 return err;
3430}
3431
3432static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
3433 struct net_device **_dev, struct inet6_dev **idev,
3434 struct netlink_ext_ack *extack)
3435{
3436 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3437 int gwa_type = ipv6_addr_type(gw_addr);
3438 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
3439 const struct net_device *dev = *_dev;
3440 bool need_addr_check = !dev;
3441 int err = -EINVAL;
3442
3443
3444
3445
3446
3447
3448 if (dev &&
3449 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3450 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3451 goto out;
3452 }
3453
3454 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
3465 NL_SET_ERR_MSG(extack, "Invalid gateway address");
3466 goto out;
3467 }
3468
3469 rcu_read_lock();
3470
3471 if (cfg->fc_flags & RTNH_F_ONLINK)
3472 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
3473 else
3474 err = ip6_route_check_nh(net, cfg, _dev, idev);
3475
3476 rcu_read_unlock();
3477
3478 if (err)
3479 goto out;
3480 }
3481
3482
3483 dev = *_dev;
3484
3485 err = -EINVAL;
3486 if (!dev) {
3487 NL_SET_ERR_MSG(extack, "Egress device not specified");
3488 goto out;
3489 } else if (dev->flags & IFF_LOOPBACK) {
3490 NL_SET_ERR_MSG(extack,
3491 "Egress device can not be loopback device for this route");
3492 goto out;
3493 }
3494
3495
3496
3497
3498 if (need_addr_check &&
3499 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3500 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3501 goto out;
3502 }
3503
3504 err = 0;
3505out:
3506 return err;
3507}
3508
3509static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
3510{
3511 if ((flags & RTF_REJECT) ||
3512 (dev && (dev->flags & IFF_LOOPBACK) &&
3513 !(addr_type & IPV6_ADDR_LOOPBACK) &&
3514 !(flags & (RTF_ANYCAST | RTF_LOCAL))))
3515 return true;
3516
3517 return false;
3518}
3519
3520int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
3521 struct fib6_config *cfg, gfp_t gfp_flags,
3522 struct netlink_ext_ack *extack)
3523{
3524 struct net_device *dev = NULL;
3525 struct inet6_dev *idev = NULL;
3526 int addr_type;
3527 int err;
3528
3529 fib6_nh->fib_nh_family = AF_INET6;
3530#ifdef CONFIG_IPV6_ROUTER_PREF
3531 fib6_nh->last_probe = jiffies;
3532#endif
3533 if (cfg->fc_is_fdb) {
3534 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3535 fib6_nh->fib_nh_gw_family = AF_INET6;
3536 return 0;
3537 }
3538
3539 err = -ENODEV;
3540 if (cfg->fc_ifindex) {
3541 dev = dev_get_by_index(net, cfg->fc_ifindex);
3542 if (!dev)
3543 goto out;
3544 idev = in6_dev_get(dev);
3545 if (!idev)
3546 goto out;
3547 }
3548
3549 if (cfg->fc_flags & RTNH_F_ONLINK) {
3550 if (!dev) {
3551 NL_SET_ERR_MSG(extack,
3552 "Nexthop device required for onlink");
3553 goto out;
3554 }
3555
3556 if (!(dev->flags & IFF_UP)) {
3557 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3558 err = -ENETDOWN;
3559 goto out;
3560 }
3561
3562 fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
3563 }
3564
3565 fib6_nh->fib_nh_weight = 1;
3566
3567
3568
3569
3570 addr_type = ipv6_addr_type(&cfg->fc_dst);
3571 if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
3572
3573 if (dev != net->loopback_dev) {
3574 if (dev) {
3575 dev_put(dev);
3576 in6_dev_put(idev);
3577 }
3578 dev = net->loopback_dev;
3579 dev_hold(dev);
3580 idev = in6_dev_get(dev);
3581 if (!idev) {
3582 err = -ENODEV;
3583 goto out;
3584 }
3585 }
3586 goto pcpu_alloc;
3587 }
3588
3589 if (cfg->fc_flags & RTF_GATEWAY) {
3590 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3591 if (err)
3592 goto out;
3593
3594 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3595 fib6_nh->fib_nh_gw_family = AF_INET6;
3596 }
3597
3598 err = -ENODEV;
3599 if (!dev)
3600 goto out;
3601
3602 if (idev->cnf.disable_ipv6) {
3603 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3604 err = -EACCES;
3605 goto out;
3606 }
3607
3608 if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
3609 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3610 err = -ENETDOWN;
3611 goto out;
3612 }
3613
3614 if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
3615 !netif_carrier_ok(dev))
3616 fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
3617
3618 err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap,
3619 cfg->fc_encap_type, cfg, gfp_flags, extack);
3620 if (err)
3621 goto out;
3622
3623pcpu_alloc:
3624 fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
3625 if (!fib6_nh->rt6i_pcpu) {
3626 err = -ENOMEM;
3627 goto out;
3628 }
3629
3630 fib6_nh->fib_nh_dev = dev;
3631 fib6_nh->fib_nh_oif = dev->ifindex;
3632 err = 0;
3633out:
3634 if (idev)
3635 in6_dev_put(idev);
3636
3637 if (err) {
3638 lwtstate_put(fib6_nh->fib_nh_lws);
3639 fib6_nh->fib_nh_lws = NULL;
3640 dev_put(dev);
3641 }
3642
3643 return err;
3644}
3645
3646void fib6_nh_release(struct fib6_nh *fib6_nh)
3647{
3648 struct rt6_exception_bucket *bucket;
3649
3650 rcu_read_lock();
3651
3652 fib6_nh_flush_exceptions(fib6_nh, NULL);
3653 bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL);
3654 if (bucket) {
3655 rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL);
3656 kfree(bucket);
3657 }
3658
3659 rcu_read_unlock();
3660
3661 if (fib6_nh->rt6i_pcpu) {
3662 int cpu;
3663
3664 for_each_possible_cpu(cpu) {
3665 struct rt6_info **ppcpu_rt;
3666 struct rt6_info *pcpu_rt;
3667
3668 ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
3669 pcpu_rt = *ppcpu_rt;
3670 if (pcpu_rt) {
3671 dst_dev_put(&pcpu_rt->dst);
3672 dst_release(&pcpu_rt->dst);
3673 *ppcpu_rt = NULL;
3674 }
3675 }
3676
3677 free_percpu(fib6_nh->rt6i_pcpu);
3678 }
3679
3680 fib_nh_common_release(&fib6_nh->nh_common);
3681}
3682
3683static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
3684 gfp_t gfp_flags,
3685 struct netlink_ext_ack *extack)
3686{
3687 struct net *net = cfg->fc_nlinfo.nl_net;
3688 struct fib6_info *rt = NULL;
3689 struct nexthop *nh = NULL;
3690 struct fib6_table *table;
3691 struct fib6_nh *fib6_nh;
3692 int err = -EINVAL;
3693 int addr_type;
3694
3695
3696 if (cfg->fc_flags & RTF_PCPU) {
3697 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
3698 goto out;
3699 }
3700
3701
3702 if (cfg->fc_flags & RTF_CACHE) {
3703 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
3704 goto out;
3705 }
3706
3707 if (cfg->fc_type > RTN_MAX) {
3708 NL_SET_ERR_MSG(extack, "Invalid route type");
3709 goto out;
3710 }
3711
3712 if (cfg->fc_dst_len > 128) {
3713 NL_SET_ERR_MSG(extack, "Invalid prefix length");
3714 goto out;
3715 }
3716 if (cfg->fc_src_len > 128) {
3717 NL_SET_ERR_MSG(extack, "Invalid source address length");
3718 goto out;
3719 }
3720#ifndef CONFIG_IPV6_SUBTREES
3721 if (cfg->fc_src_len) {
3722 NL_SET_ERR_MSG(extack,
3723 "Specifying source address requires IPV6_SUBTREES to be enabled");
3724 goto out;
3725 }
3726#endif
3727 if (cfg->fc_nh_id) {
3728 nh = nexthop_find_by_id(net, cfg->fc_nh_id);
3729 if (!nh) {
3730 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
3731 goto out;
3732 }
3733 err = fib6_check_nexthop(nh, cfg, extack);
3734 if (err)
3735 goto out;
3736 }
3737
3738 err = -ENOBUFS;
3739 if (cfg->fc_nlinfo.nlh &&
3740 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
3741 table = fib6_get_table(net, cfg->fc_table);
3742 if (!table) {
3743 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
3744 table = fib6_new_table(net, cfg->fc_table);
3745 }
3746 } else {
3747 table = fib6_new_table(net, cfg->fc_table);
3748 }
3749
3750 if (!table)
3751 goto out;
3752
3753 err = -ENOMEM;
3754 rt = fib6_info_alloc(gfp_flags, !nh);
3755 if (!rt)
3756 goto out;
3757
3758 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
3759 extack);
3760 if (IS_ERR(rt->fib6_metrics)) {
3761 err = PTR_ERR(rt->fib6_metrics);
3762
3763 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
3764 goto out_free;
3765 }
3766
3767 if (cfg->fc_flags & RTF_ADDRCONF)
3768 rt->dst_nocount = true;
3769
3770 if (cfg->fc_flags & RTF_EXPIRES)
3771 fib6_set_expires(rt, jiffies +
3772 clock_t_to_jiffies(cfg->fc_expires));
3773 else
3774 fib6_clean_expires(rt);
3775
3776 if (cfg->fc_protocol == RTPROT_UNSPEC)
3777 cfg->fc_protocol = RTPROT_BOOT;
3778 rt->fib6_protocol = cfg->fc_protocol;
3779
3780 rt->fib6_table = table;
3781 rt->fib6_metric = cfg->fc_metric;
3782 rt->fib6_type = cfg->fc_type ? : RTN_UNICAST;
3783 rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
3784
3785 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3786 rt->fib6_dst.plen = cfg->fc_dst_len;
3787
3788#ifdef CONFIG_IPV6_SUBTREES
3789 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3790 rt->fib6_src.plen = cfg->fc_src_len;
3791#endif
3792 if (nh) {
3793 if (rt->fib6_src.plen) {
3794 NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing");
3795 goto out_free;
3796 }
3797 if (!nexthop_get(nh)) {
3798 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
3799 goto out_free;
3800 }
3801 rt->nh = nh;
3802 fib6_nh = nexthop_fib6_nh(rt->nh);
3803 } else {
3804 err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack);
3805 if (err)
3806 goto out;
3807
3808 fib6_nh = rt->fib6_nh;
3809
3810
3811
3812
3813 addr_type = ipv6_addr_type(&cfg->fc_dst);
3814 if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev,
3815 addr_type))
3816 rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
3817 }
3818
3819 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
3820 struct net_device *dev = fib6_nh->fib_nh_dev;
3821
3822 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
3823 NL_SET_ERR_MSG(extack, "Invalid source address");
3824 err = -EINVAL;
3825 goto out;
3826 }
3827 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3828 rt->fib6_prefsrc.plen = 128;
3829 } else
3830 rt->fib6_prefsrc.plen = 0;
3831
3832 return rt;
3833out:
3834 fib6_info_release(rt);
3835 return ERR_PTR(err);
3836out_free:
3837 ip_fib_metrics_put(rt->fib6_metrics);
3838 kfree(rt);
3839 return ERR_PTR(err);
3840}
3841
3842int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
3843 struct netlink_ext_ack *extack)
3844{
3845 struct fib6_info *rt;
3846 int err;
3847
3848 rt = ip6_route_info_create(cfg, gfp_flags, extack);
3849 if (IS_ERR(rt))
3850 return PTR_ERR(rt);
3851
3852 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
3853 fib6_info_release(rt);
3854
3855 return err;
3856}
3857
3858static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
3859{
3860 struct net *net = info->nl_net;
3861 struct fib6_table *table;
3862 int err;
3863
3864 if (rt == net->ipv6.fib6_null_entry) {
3865 err = -ENOENT;
3866 goto out;
3867 }
3868
3869 table = rt->fib6_table;
3870 spin_lock_bh(&table->tb6_lock);
3871 err = fib6_del(rt, info);
3872 spin_unlock_bh(&table->tb6_lock);
3873
3874out:
3875 fib6_info_release(rt);
3876 return err;
3877}
3878
3879int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify)
3880{
3881 struct nl_info info = {
3882 .nl_net = net,
3883 .skip_notify = skip_notify
3884 };
3885
3886 return __ip6_del_rt(rt, &info);
3887}
3888
3889static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
3890{
3891 struct nl_info *info = &cfg->fc_nlinfo;
3892 struct net *net = info->nl_net;
3893 struct sk_buff *skb = NULL;
3894 struct fib6_table *table;
3895 int err = -ENOENT;
3896
3897 if (rt == net->ipv6.fib6_null_entry)
3898 goto out_put;
3899 table = rt->fib6_table;
3900 spin_lock_bh(&table->tb6_lock);
3901
3902 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
3903 struct fib6_info *sibling, *next_sibling;
3904 struct fib6_node *fn;
3905
3906
3907 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3908 if (skb) {
3909 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3910
3911 if (rt6_fill_node(net, skb, rt, NULL,
3912 NULL, NULL, 0, RTM_DELROUTE,
3913 info->portid, seq, 0) < 0) {
3914 kfree_skb(skb);
3915 skb = NULL;
3916 } else
3917 info->skip_notify = 1;
3918 }
3919
3920
3921
3922
3923
3924
3925 info->skip_notify_kernel = 1;
3926 fn = rcu_dereference_protected(rt->fib6_node,
3927 lockdep_is_held(&table->tb6_lock));
3928 if (rcu_access_pointer(fn->leaf) == rt) {
3929 struct fib6_info *last_sibling, *replace_rt;
3930
3931 last_sibling = list_last_entry(&rt->fib6_siblings,
3932 struct fib6_info,
3933 fib6_siblings);
3934 replace_rt = rcu_dereference_protected(
3935 last_sibling->fib6_next,
3936 lockdep_is_held(&table->tb6_lock));
3937 if (replace_rt)
3938 call_fib6_entry_notifiers_replace(net,
3939 replace_rt);
3940 else
3941 call_fib6_multipath_entry_notifiers(net,
3942 FIB_EVENT_ENTRY_DEL,
3943 rt, rt->fib6_nsiblings,
3944 NULL);
3945 }
3946 list_for_each_entry_safe(sibling, next_sibling,
3947 &rt->fib6_siblings,
3948 fib6_siblings) {
3949 err = fib6_del(sibling, info);
3950 if (err)
3951 goto out_unlock;
3952 }
3953 }
3954
3955 err = fib6_del(rt, info);
3956out_unlock:
3957 spin_unlock_bh(&table->tb6_lock);
3958out_put:
3959 fib6_info_release(rt);
3960
3961 if (skb) {
3962 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3963 info->nlh, gfp_any());
3964 }
3965 return err;
3966}
3967
3968static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
3969{
3970 int rc = -ESRCH;
3971
3972 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3973 goto out;
3974
3975 if (cfg->fc_flags & RTF_GATEWAY &&
3976 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3977 goto out;
3978
3979 rc = rt6_remove_exception_rt(rt);
3980out:
3981 return rc;
3982}
3983
3984static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt,
3985 struct fib6_nh *nh)
3986{
3987 struct fib6_result res = {
3988 .f6i = rt,
3989 .nh = nh,
3990 };
3991 struct rt6_info *rt_cache;
3992
3993 rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src);
3994 if (rt_cache)
3995 return __ip6_del_cached_rt(rt_cache, cfg);
3996
3997 return 0;
3998}
3999
4000struct fib6_nh_del_cached_rt_arg {
4001 struct fib6_config *cfg;
4002 struct fib6_info *f6i;
4003};
4004
4005static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg)
4006{
4007 struct fib6_nh_del_cached_rt_arg *arg = _arg;
4008 int rc;
4009
4010 rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh);
4011 return rc != -ESRCH ? rc : 0;
4012}
4013
4014static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i)
4015{
4016 struct fib6_nh_del_cached_rt_arg arg = {
4017 .cfg = cfg,
4018 .f6i = f6i
4019 };
4020
4021 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg);
4022}
4023
4024static int ip6_route_del(struct fib6_config *cfg,
4025 struct netlink_ext_ack *extack)
4026{
4027 struct fib6_table *table;
4028 struct fib6_info *rt;
4029 struct fib6_node *fn;
4030 int err = -ESRCH;
4031
4032 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
4033 if (!table) {
4034 NL_SET_ERR_MSG(extack, "FIB table does not exist");
4035 return err;
4036 }
4037
4038 rcu_read_lock();
4039
4040 fn = fib6_locate(&table->tb6_root,
4041 &cfg->fc_dst, cfg->fc_dst_len,
4042 &cfg->fc_src, cfg->fc_src_len,
4043 !(cfg->fc_flags & RTF_CACHE));
4044
4045 if (fn) {
4046 for_each_fib6_node_rt_rcu(fn) {
4047 struct fib6_nh *nh;
4048
4049 if (rt->nh && cfg->fc_nh_id &&
4050 rt->nh->id != cfg->fc_nh_id)
4051 continue;
4052
4053 if (cfg->fc_flags & RTF_CACHE) {
4054 int rc = 0;
4055
4056 if (rt->nh) {
4057 rc = ip6_del_cached_rt_nh(cfg, rt);
4058 } else if (cfg->fc_nh_id) {
4059 continue;
4060 } else {
4061 nh = rt->fib6_nh;
4062 rc = ip6_del_cached_rt(cfg, rt, nh);
4063 }
4064 if (rc != -ESRCH) {
4065 rcu_read_unlock();
4066 return rc;
4067 }
4068 continue;
4069 }
4070
4071 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
4072 continue;
4073 if (cfg->fc_protocol &&
4074 cfg->fc_protocol != rt->fib6_protocol)
4075 continue;
4076
4077 if (rt->nh) {
4078 if (!fib6_info_hold_safe(rt))
4079 continue;
4080 rcu_read_unlock();
4081
4082 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
4083 }
4084 if (cfg->fc_nh_id)
4085 continue;
4086
4087 nh = rt->fib6_nh;
4088 if (cfg->fc_ifindex &&
4089 (!nh->fib_nh_dev ||
4090 nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
4091 continue;
4092 if (cfg->fc_flags & RTF_GATEWAY &&
4093 !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
4094 continue;
4095 if (!fib6_info_hold_safe(rt))
4096 continue;
4097 rcu_read_unlock();
4098
4099
4100 if (cfg->fc_flags & RTF_GATEWAY)
4101 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
4102
4103 return __ip6_del_rt_siblings(rt, cfg);
4104 }
4105 }
4106 rcu_read_unlock();
4107
4108 return err;
4109}
4110
4111static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
4112{
4113 struct netevent_redirect netevent;
4114 struct rt6_info *rt, *nrt = NULL;
4115 struct fib6_result res = {};
4116 struct ndisc_options ndopts;
4117 struct inet6_dev *in6_dev;
4118 struct neighbour *neigh;
4119 struct rd_msg *msg;
4120 int optlen, on_link;
4121 u8 *lladdr;
4122
4123 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
4124 optlen -= sizeof(*msg);
4125
4126 if (optlen < 0) {
4127 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
4128 return;
4129 }
4130
4131 msg = (struct rd_msg *)icmp6_hdr(skb);
4132
4133 if (ipv6_addr_is_multicast(&msg->dest)) {
4134 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
4135 return;
4136 }
4137
4138 on_link = 0;
4139 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
4140 on_link = 1;
4141 } else if (ipv6_addr_type(&msg->target) !=
4142 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
4143 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
4144 return;
4145 }
4146
4147 in6_dev = __in6_dev_get(skb->dev);
4148 if (!in6_dev)
4149 return;
4150 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
4151 return;
4152
4153
4154
4155
4156
4157
4158 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
4159 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
4160 return;
4161 }
4162
4163 lladdr = NULL;
4164 if (ndopts.nd_opts_tgt_lladdr) {
4165 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
4166 skb->dev);
4167 if (!lladdr) {
4168 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
4169 return;
4170 }
4171 }
4172
4173 rt = (struct rt6_info *) dst;
4174 if (rt->rt6i_flags & RTF_REJECT) {
4175 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
4176 return;
4177 }
4178
4179
4180
4181
4182
4183 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
4184
4185 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
4186 if (!neigh)
4187 return;
4188
4189
4190
4191
4192
4193 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
4194 NEIGH_UPDATE_F_WEAK_OVERRIDE|
4195 NEIGH_UPDATE_F_OVERRIDE|
4196 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
4197 NEIGH_UPDATE_F_ISROUTER)),
4198 NDISC_REDIRECT, &ndopts);
4199
4200 rcu_read_lock();
4201 res.f6i = rcu_dereference(rt->from);
4202 if (!res.f6i)
4203 goto out;
4204
4205 if (res.f6i->nh) {
4206 struct fib6_nh_match_arg arg = {
4207 .dev = dst->dev,
4208 .gw = &rt->rt6i_gateway,
4209 };
4210
4211 nexthop_for_each_fib6_nh(res.f6i->nh,
4212 fib6_nh_find_match, &arg);
4213
4214
4215
4216
4217 if (!arg.match)
4218 goto out;
4219 res.nh = arg.match;
4220 } else {
4221 res.nh = res.f6i->fib6_nh;
4222 }
4223
4224 res.fib6_flags = res.f6i->fib6_flags;
4225 res.fib6_type = res.f6i->fib6_type;
4226 nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
4227 if (!nrt)
4228 goto out;
4229
4230 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
4231 if (on_link)
4232 nrt->rt6i_flags &= ~RTF_GATEWAY;
4233
4234 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
4235
4236
4237 if (rt6_insert_exception(nrt, &res)) {
4238 dst_release_immediate(&nrt->dst);
4239 goto out;
4240 }
4241
4242 netevent.old = &rt->dst;
4243 netevent.new = &nrt->dst;
4244 netevent.daddr = &msg->dest;
4245 netevent.neigh = neigh;
4246 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
4247
4248out:
4249 rcu_read_unlock();
4250 neigh_release(neigh);
4251}
4252
4253#ifdef CONFIG_IPV6_ROUTE_INFO
4254static struct fib6_info *rt6_get_route_info(struct net *net,
4255 const struct in6_addr *prefix, int prefixlen,
4256 const struct in6_addr *gwaddr,
4257 struct net_device *dev)
4258{
4259 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4260 int ifindex = dev->ifindex;
4261 struct fib6_node *fn;
4262 struct fib6_info *rt = NULL;
4263 struct fib6_table *table;
4264
4265 table = fib6_get_table(net, tb_id);
4266 if (!table)
4267 return NULL;
4268
4269 rcu_read_lock();
4270 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
4271 if (!fn)
4272 goto out;
4273
4274 for_each_fib6_node_rt_rcu(fn) {
4275
4276 if (rt->nh)
4277 continue;
4278 if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex)
4279 continue;
4280 if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
4281 !rt->fib6_nh->fib_nh_gw_family)
4282 continue;
4283 if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr))
4284 continue;
4285 if (!fib6_info_hold_safe(rt))
4286 continue;
4287 break;
4288 }
4289out:
4290 rcu_read_unlock();
4291 return rt;
4292}
4293
4294static struct fib6_info *rt6_add_route_info(struct net *net,
4295 const struct in6_addr *prefix, int prefixlen,
4296 const struct in6_addr *gwaddr,
4297 struct net_device *dev,
4298 unsigned int pref)
4299{
4300 struct fib6_config cfg = {
4301 .fc_metric = IP6_RT_PRIO_USER,
4302 .fc_ifindex = dev->ifindex,
4303 .fc_dst_len = prefixlen,
4304 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
4305 RTF_UP | RTF_PREF(pref),
4306 .fc_protocol = RTPROT_RA,
4307 .fc_type = RTN_UNICAST,
4308 .fc_nlinfo.portid = 0,
4309 .fc_nlinfo.nlh = NULL,
4310 .fc_nlinfo.nl_net = net,
4311 };
4312
4313 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4314 cfg.fc_dst = *prefix;
4315 cfg.fc_gateway = *gwaddr;
4316
4317
4318 if (!prefixlen)
4319 cfg.fc_flags |= RTF_DEFAULT;
4320
4321 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
4322
4323 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
4324}
4325#endif
4326
4327struct fib6_info *rt6_get_dflt_router(struct net *net,
4328 const struct in6_addr *addr,
4329 struct net_device *dev)
4330{
4331 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
4332 struct fib6_info *rt;
4333 struct fib6_table *table;
4334
4335 table = fib6_get_table(net, tb_id);
4336 if (!table)
4337 return NULL;
4338
4339 rcu_read_lock();
4340 for_each_fib6_node_rt_rcu(&table->tb6_root) {
4341 struct fib6_nh *nh;
4342
4343
4344 if (rt->nh)
4345 continue;
4346
4347 nh = rt->fib6_nh;
4348 if (dev == nh->fib_nh_dev &&
4349 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
4350 ipv6_addr_equal(&nh->fib_nh_gw6, addr))
4351 break;
4352 }
4353 if (rt && !fib6_info_hold_safe(rt))
4354 rt = NULL;
4355 rcu_read_unlock();
4356 return rt;
4357}
4358
4359struct fib6_info *rt6_add_dflt_router(struct net *net,
4360 const struct in6_addr *gwaddr,
4361 struct net_device *dev,
4362 unsigned int pref,
4363 u32 defrtr_usr_metric)
4364{
4365 struct fib6_config cfg = {
4366 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
4367 .fc_metric = defrtr_usr_metric,
4368 .fc_ifindex = dev->ifindex,
4369 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
4370 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
4371 .fc_protocol = RTPROT_RA,
4372 .fc_type = RTN_UNICAST,
4373 .fc_nlinfo.portid = 0,
4374 .fc_nlinfo.nlh = NULL,
4375 .fc_nlinfo.nl_net = net,
4376 };
4377
4378 cfg.fc_gateway = *gwaddr;
4379
4380 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
4381 struct fib6_table *table;
4382
4383 table = fib6_get_table(dev_net(dev), cfg.fc_table);
4384 if (table)
4385 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
4386 }
4387
4388 return rt6_get_dflt_router(net, gwaddr, dev);
4389}
4390
4391static void __rt6_purge_dflt_routers(struct net *net,
4392 struct fib6_table *table)
4393{
4394 struct fib6_info *rt;
4395
4396restart:
4397 rcu_read_lock();
4398 for_each_fib6_node_rt_rcu(&table->tb6_root) {
4399 struct net_device *dev = fib6_info_nh_dev(rt);
4400 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
4401
4402 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
4403 (!idev || idev->cnf.accept_ra != 2) &&
4404 fib6_info_hold_safe(rt)) {
4405 rcu_read_unlock();
4406 ip6_del_rt(net, rt, false);
4407 goto restart;
4408 }
4409 }
4410 rcu_read_unlock();
4411
4412 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
4413}
4414
4415void rt6_purge_dflt_routers(struct net *net)
4416{
4417 struct fib6_table *table;
4418 struct hlist_head *head;
4419 unsigned int h;
4420
4421 rcu_read_lock();
4422
4423 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
4424 head = &net->ipv6.fib_table_hash[h];
4425 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
4426 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
4427 __rt6_purge_dflt_routers(net, table);
4428 }
4429 }
4430
4431 rcu_read_unlock();
4432}
4433
4434static void rtmsg_to_fib6_config(struct net *net,
4435 struct in6_rtmsg *rtmsg,
4436 struct fib6_config *cfg)
4437{
4438 *cfg = (struct fib6_config){
4439 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
4440 : RT6_TABLE_MAIN,
4441 .fc_ifindex = rtmsg->rtmsg_ifindex,
4442 .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
4443 .fc_expires = rtmsg->rtmsg_info,
4444 .fc_dst_len = rtmsg->rtmsg_dst_len,
4445 .fc_src_len = rtmsg->rtmsg_src_len,
4446 .fc_flags = rtmsg->rtmsg_flags,
4447 .fc_type = rtmsg->rtmsg_type,
4448
4449 .fc_nlinfo.nl_net = net,
4450
4451 .fc_dst = rtmsg->rtmsg_dst,
4452 .fc_src = rtmsg->rtmsg_src,
4453 .fc_gateway = rtmsg->rtmsg_gateway,
4454 };
4455}
4456
4457int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg)
4458{
4459 struct fib6_config cfg;
4460 int err;
4461
4462 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
4463 return -EINVAL;
4464 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4465 return -EPERM;
4466
4467 rtmsg_to_fib6_config(net, rtmsg, &cfg);
4468
4469 rtnl_lock();
4470 switch (cmd) {
4471 case SIOCADDRT:
4472 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
4473 break;
4474 case SIOCDELRT:
4475 err = ip6_route_del(&cfg, NULL);
4476 break;
4477 }
4478 rtnl_unlock();
4479 return err;
4480}
4481
4482
4483
4484
4485
4486static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
4487{
4488 struct dst_entry *dst = skb_dst(skb);
4489 struct net *net = dev_net(dst->dev);
4490 struct inet6_dev *idev;
4491 int type;
4492
4493 if (netif_is_l3_master(skb->dev) &&
4494 dst->dev == net->loopback_dev)
4495 idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
4496 else
4497 idev = ip6_dst_idev(dst);
4498
4499 switch (ipstats_mib_noroutes) {
4500 case IPSTATS_MIB_INNOROUTES:
4501 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
4502 if (type == IPV6_ADDR_ANY) {
4503 IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
4504 break;
4505 }
4506 fallthrough;
4507 case IPSTATS_MIB_OUTNOROUTES:
4508 IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
4509 break;
4510 }
4511
4512
4513 if (netif_is_l3_master(skb->dev))
4514 skb_dst_drop(skb);
4515
4516 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
4517 kfree_skb(skb);
4518 return 0;
4519}
4520
4521static int ip6_pkt_discard(struct sk_buff *skb)
4522{
4523 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
4524}
4525
4526static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
4527{
4528 skb->dev = skb_dst(skb)->dev;
4529 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
4530}
4531
4532static int ip6_pkt_prohibit(struct sk_buff *skb)
4533{
4534 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
4535}
4536
4537static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
4538{
4539 skb->dev = skb_dst(skb)->dev;
4540 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
4541}
4542
4543
4544
4545
4546
4547struct fib6_info *addrconf_f6i_alloc(struct net *net,
4548 struct inet6_dev *idev,
4549 const struct in6_addr *addr,
4550 bool anycast, gfp_t gfp_flags)
4551{
4552 struct fib6_config cfg = {
4553 .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
4554 .fc_ifindex = idev->dev->ifindex,
4555 .fc_flags = RTF_UP | RTF_NONEXTHOP,
4556 .fc_dst = *addr,
4557 .fc_dst_len = 128,
4558 .fc_protocol = RTPROT_KERNEL,
4559 .fc_nlinfo.nl_net = net,
4560 .fc_ignore_dev_down = true,
4561 };
4562 struct fib6_info *f6i;
4563
4564 if (anycast) {
4565 cfg.fc_type = RTN_ANYCAST;
4566 cfg.fc_flags |= RTF_ANYCAST;
4567 } else {
4568 cfg.fc_type = RTN_LOCAL;
4569 cfg.fc_flags |= RTF_LOCAL;
4570 }
4571
4572 f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
4573 if (!IS_ERR(f6i))
4574 f6i->dst_nocount = true;
4575 return f6i;
4576}
4577
4578
4579struct arg_dev_net_ip {
4580 struct net_device *dev;
4581 struct net *net;
4582 struct in6_addr *addr;
4583};
4584
4585static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
4586{
4587 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
4588 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
4589 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
4590
4591 if (!rt->nh &&
4592 ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) &&
4593 rt != net->ipv6.fib6_null_entry &&
4594 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
4595 spin_lock_bh(&rt6_exception_lock);
4596
4597 rt->fib6_prefsrc.plen = 0;
4598 spin_unlock_bh(&rt6_exception_lock);
4599 }
4600 return 0;
4601}
4602
4603void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
4604{
4605 struct net *net = dev_net(ifp->idev->dev);
4606 struct arg_dev_net_ip adni = {
4607 .dev = ifp->idev->dev,
4608 .net = net,
4609 .addr = &ifp->addr,
4610 };
4611 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
4612}
4613
4614#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
4615
4616
4617static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
4618{
4619 struct in6_addr *gateway = (struct in6_addr *)arg;
4620 struct fib6_nh *nh;
4621
4622
4623 if (rt->nh)
4624 return 0;
4625
4626 nh = rt->fib6_nh;
4627 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
4628 nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6))
4629 return -1;
4630
4631
4632
4633
4634
4635 fib6_nh_exceptions_clean_tohost(nh, gateway);
4636
4637 return 0;
4638}
4639
4640void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
4641{
4642 fib6_clean_all(net, fib6_clean_tohost, gateway);
4643}
4644
4645struct arg_netdev_event {
4646 const struct net_device *dev;
4647 union {
4648 unsigned char nh_flags;
4649 unsigned long event;
4650 };
4651};
4652
4653static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
4654{
4655 struct fib6_info *iter;
4656 struct fib6_node *fn;
4657
4658 fn = rcu_dereference_protected(rt->fib6_node,
4659 lockdep_is_held(&rt->fib6_table->tb6_lock));
4660 iter = rcu_dereference_protected(fn->leaf,
4661 lockdep_is_held(&rt->fib6_table->tb6_lock));
4662 while (iter) {
4663 if (iter->fib6_metric == rt->fib6_metric &&
4664 rt6_qualify_for_ecmp(iter))
4665 return iter;
4666 iter = rcu_dereference_protected(iter->fib6_next,
4667 lockdep_is_held(&rt->fib6_table->tb6_lock));
4668 }
4669
4670 return NULL;
4671}
4672
4673
4674static bool rt6_is_dead(const struct fib6_info *rt)
4675{
4676 if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD ||
4677 (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN &&
4678 ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev)))
4679 return true;
4680
4681 return false;
4682}
4683
4684static int rt6_multipath_total_weight(const struct fib6_info *rt)
4685{
4686 struct fib6_info *iter;
4687 int total = 0;
4688
4689 if (!rt6_is_dead(rt))
4690 total += rt->fib6_nh->fib_nh_weight;
4691
4692 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
4693 if (!rt6_is_dead(iter))
4694 total += iter->fib6_nh->fib_nh_weight;
4695 }
4696
4697 return total;
4698}
4699
4700static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
4701{
4702 int upper_bound = -1;
4703
4704 if (!rt6_is_dead(rt)) {
4705 *weight += rt->fib6_nh->fib_nh_weight;
4706 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
4707 total) - 1;
4708 }
4709 atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound);
4710}
4711
4712static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
4713{
4714 struct fib6_info *iter;
4715 int weight = 0;
4716
4717 rt6_upper_bound_set(rt, &weight, total);
4718
4719 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4720 rt6_upper_bound_set(iter, &weight, total);
4721}
4722
4723void rt6_multipath_rebalance(struct fib6_info *rt)
4724{
4725 struct fib6_info *first;
4726 int total;
4727
4728
4729
4730
4731
4732 if (!rt->fib6_nsiblings || rt->should_flush)
4733 return;
4734
4735
4736
4737
4738
4739 first = rt6_multipath_first_sibling(rt);
4740 if (WARN_ON_ONCE(!first))
4741 return;
4742
4743 total = rt6_multipath_total_weight(first);
4744 rt6_multipath_upper_bound_set(first, total);
4745}
4746
4747static int fib6_ifup(struct fib6_info *rt, void *p_arg)
4748{
4749 const struct arg_netdev_event *arg = p_arg;
4750 struct net *net = dev_net(arg->dev);
4751
4752 if (rt != net->ipv6.fib6_null_entry && !rt->nh &&
4753 rt->fib6_nh->fib_nh_dev == arg->dev) {
4754 rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags;
4755 fib6_update_sernum_upto_root(net, rt);
4756 rt6_multipath_rebalance(rt);
4757 }
4758
4759 return 0;
4760}
4761
4762void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
4763{
4764 struct arg_netdev_event arg = {
4765 .dev = dev,
4766 {
4767 .nh_flags = nh_flags,
4768 },
4769 };
4770
4771 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
4772 arg.nh_flags |= RTNH_F_LINKDOWN;
4773
4774 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
4775}
4776
4777
4778static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
4779 const struct net_device *dev)
4780{
4781 struct fib6_info *iter;
4782
4783 if (rt->fib6_nh->fib_nh_dev == dev)
4784 return true;
4785 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4786 if (iter->fib6_nh->fib_nh_dev == dev)
4787 return true;
4788
4789 return false;
4790}
4791
4792static void rt6_multipath_flush(struct fib6_info *rt)
4793{
4794 struct fib6_info *iter;
4795
4796 rt->should_flush = 1;
4797 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4798 iter->should_flush = 1;
4799}
4800
4801static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
4802 const struct net_device *down_dev)
4803{
4804 struct fib6_info *iter;
4805 unsigned int dead = 0;
4806
4807 if (rt->fib6_nh->fib_nh_dev == down_dev ||
4808 rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
4809 dead++;
4810 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4811 if (iter->fib6_nh->fib_nh_dev == down_dev ||
4812 iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
4813 dead++;
4814
4815 return dead;
4816}
4817
4818static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
4819 const struct net_device *dev,
4820 unsigned char nh_flags)
4821{
4822 struct fib6_info *iter;
4823
4824 if (rt->fib6_nh->fib_nh_dev == dev)
4825 rt->fib6_nh->fib_nh_flags |= nh_flags;
4826 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4827 if (iter->fib6_nh->fib_nh_dev == dev)
4828 iter->fib6_nh->fib_nh_flags |= nh_flags;
4829}
4830
4831
4832static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
4833{
4834 const struct arg_netdev_event *arg = p_arg;
4835 const struct net_device *dev = arg->dev;
4836 struct net *net = dev_net(dev);
4837
4838 if (rt == net->ipv6.fib6_null_entry || rt->nh)
4839 return 0;
4840
4841 switch (arg->event) {
4842 case NETDEV_UNREGISTER:
4843 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
4844 case NETDEV_DOWN:
4845 if (rt->should_flush)
4846 return -1;
4847 if (!rt->fib6_nsiblings)
4848 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
4849 if (rt6_multipath_uses_dev(rt, dev)) {
4850 unsigned int count;
4851
4852 count = rt6_multipath_dead_count(rt, dev);
4853 if (rt->fib6_nsiblings + 1 == count) {
4854 rt6_multipath_flush(rt);
4855 return -1;
4856 }
4857 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4858 RTNH_F_LINKDOWN);
4859 fib6_update_sernum(net, rt);
4860 rt6_multipath_rebalance(rt);
4861 }
4862 return -2;
4863 case NETDEV_CHANGE:
4864 if (rt->fib6_nh->fib_nh_dev != dev ||
4865 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
4866 break;
4867 rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
4868 rt6_multipath_rebalance(rt);
4869 break;
4870 }
4871
4872 return 0;
4873}
4874
4875void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
4876{
4877 struct arg_netdev_event arg = {
4878 .dev = dev,
4879 {
4880 .event = event,
4881 },
4882 };
4883 struct net *net = dev_net(dev);
4884
4885 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4886 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4887 else
4888 fib6_clean_all(net, fib6_ifdown, &arg);
4889}
4890
4891void rt6_disable_ip(struct net_device *dev, unsigned long event)
4892{
4893 rt6_sync_down_dev(dev, event);
4894 rt6_uncached_list_flush_dev(dev_net(dev), dev);
4895 neigh_ifdown(&nd_tbl, dev);
4896}
4897
4898struct rt6_mtu_change_arg {
4899 struct net_device *dev;
4900 unsigned int mtu;
4901 struct fib6_info *f6i;
4902};
4903
4904static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg)
4905{
4906 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg;
4907 struct fib6_info *f6i = arg->f6i;
4908
4909
4910
4911
4912
4913
4914 if (nh->fib_nh_dev == arg->dev) {
4915 struct inet6_dev *idev = __in6_dev_get(arg->dev);
4916 u32 mtu = f6i->fib6_pmtu;
4917
4918 if (mtu >= arg->mtu ||
4919 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4920 fib6_metric_set(f6i, RTAX_MTU, arg->mtu);
4921
4922 spin_lock_bh(&rt6_exception_lock);
4923 rt6_exceptions_update_pmtu(idev, nh, arg->mtu);
4924 spin_unlock_bh(&rt6_exception_lock);
4925 }
4926
4927 return 0;
4928}
4929
4930static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg)
4931{
4932 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4933 struct inet6_dev *idev;
4934
4935
4936
4937
4938
4939
4940
4941 idev = __in6_dev_get(arg->dev);
4942 if (!idev)
4943 return 0;
4944
4945 if (fib6_metric_locked(f6i, RTAX_MTU))
4946 return 0;
4947
4948 arg->f6i = f6i;
4949 if (f6i->nh) {
4950
4951 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change,
4952 arg);
4953 }
4954
4955 return fib6_nh_mtu_change(f6i->fib6_nh, arg);
4956}
4957
4958void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
4959{
4960 struct rt6_mtu_change_arg arg = {
4961 .dev = dev,
4962 .mtu = mtu,
4963 };
4964
4965 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
4966}
4967
4968static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
4969 [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 },
4970 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
4971 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
4972 [RTA_OIF] = { .type = NLA_U32 },
4973 [RTA_IIF] = { .type = NLA_U32 },
4974 [RTA_PRIORITY] = { .type = NLA_U32 },
4975 [RTA_METRICS] = { .type = NLA_NESTED },
4976 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
4977 [RTA_PREF] = { .type = NLA_U8 },
4978 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4979 [RTA_ENCAP] = { .type = NLA_NESTED },
4980 [RTA_EXPIRES] = { .type = NLA_U32 },
4981 [RTA_UID] = { .type = NLA_U32 },
4982 [RTA_MARK] = { .type = NLA_U32 },
4983 [RTA_TABLE] = { .type = NLA_U32 },
4984 [RTA_IP_PROTO] = { .type = NLA_U8 },
4985 [RTA_SPORT] = { .type = NLA_U16 },
4986 [RTA_DPORT] = { .type = NLA_U16 },
4987 [RTA_NH_ID] = { .type = NLA_U32 },
4988};
4989
4990static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
4991 struct fib6_config *cfg,
4992 struct netlink_ext_ack *extack)
4993{
4994 struct rtmsg *rtm;
4995 struct nlattr *tb[RTA_MAX+1];
4996 unsigned int pref;
4997 int err;
4998
4999 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5000 rtm_ipv6_policy, extack);
5001 if (err < 0)
5002 goto errout;
5003
5004 err = -EINVAL;
5005 rtm = nlmsg_data(nlh);
5006
5007 *cfg = (struct fib6_config){
5008 .fc_table = rtm->rtm_table,
5009 .fc_dst_len = rtm->rtm_dst_len,
5010 .fc_src_len = rtm->rtm_src_len,
5011 .fc_flags = RTF_UP,
5012 .fc_protocol = rtm->rtm_protocol,
5013 .fc_type = rtm->rtm_type,
5014
5015 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
5016 .fc_nlinfo.nlh = nlh,
5017 .fc_nlinfo.nl_net = sock_net(skb->sk),
5018 };
5019
5020 if (rtm->rtm_type == RTN_UNREACHABLE ||
5021 rtm->rtm_type == RTN_BLACKHOLE ||
5022 rtm->rtm_type == RTN_PROHIBIT ||
5023 rtm->rtm_type == RTN_THROW)
5024 cfg->fc_flags |= RTF_REJECT;
5025
5026 if (rtm->rtm_type == RTN_LOCAL)
5027 cfg->fc_flags |= RTF_LOCAL;
5028
5029 if (rtm->rtm_flags & RTM_F_CLONED)
5030 cfg->fc_flags |= RTF_CACHE;
5031
5032 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
5033
5034 if (tb[RTA_NH_ID]) {
5035 if (tb[RTA_GATEWAY] || tb[RTA_OIF] ||
5036 tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) {
5037 NL_SET_ERR_MSG(extack,
5038 "Nexthop specification and nexthop id are mutually exclusive");
5039 goto errout;
5040 }
5041 cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]);
5042 }
5043
5044 if (tb[RTA_GATEWAY]) {
5045 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
5046 cfg->fc_flags |= RTF_GATEWAY;
5047 }
5048 if (tb[RTA_VIA]) {
5049 NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
5050 goto errout;
5051 }
5052
5053 if (tb[RTA_DST]) {
5054 int plen = (rtm->rtm_dst_len + 7) >> 3;
5055
5056 if (nla_len(tb[RTA_DST]) < plen)
5057 goto errout;
5058
5059 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
5060 }
5061
5062 if (tb[RTA_SRC]) {
5063 int plen = (rtm->rtm_src_len + 7) >> 3;
5064
5065 if (nla_len(tb[RTA_SRC]) < plen)
5066 goto errout;
5067
5068 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
5069 }
5070
5071 if (tb[RTA_PREFSRC])
5072 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
5073
5074 if (tb[RTA_OIF])
5075 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
5076
5077 if (tb[RTA_PRIORITY])
5078 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
5079
5080 if (tb[RTA_METRICS]) {
5081 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
5082 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
5083 }
5084
5085 if (tb[RTA_TABLE])
5086 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
5087
5088 if (tb[RTA_MULTIPATH]) {
5089 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
5090 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
5091
5092 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
5093 cfg->fc_mp_len, extack);
5094 if (err < 0)
5095 goto errout;
5096 }
5097
5098 if (tb[RTA_PREF]) {
5099 pref = nla_get_u8(tb[RTA_PREF]);
5100 if (pref != ICMPV6_ROUTER_PREF_LOW &&
5101 pref != ICMPV6_ROUTER_PREF_HIGH)
5102 pref = ICMPV6_ROUTER_PREF_MEDIUM;
5103 cfg->fc_flags |= RTF_PREF(pref);
5104 }
5105
5106 if (tb[RTA_ENCAP])
5107 cfg->fc_encap = tb[RTA_ENCAP];
5108
5109 if (tb[RTA_ENCAP_TYPE]) {
5110 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
5111
5112 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
5113 if (err < 0)
5114 goto errout;
5115 }
5116
5117 if (tb[RTA_EXPIRES]) {
5118 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
5119
5120 if (addrconf_finite_timeout(timeout)) {
5121 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
5122 cfg->fc_flags |= RTF_EXPIRES;
5123 }
5124 }
5125
5126 err = 0;
5127errout:
5128 return err;
5129}
5130
5131struct rt6_nh {
5132 struct fib6_info *fib6_info;
5133 struct fib6_config r_cfg;
5134 struct list_head next;
5135};
5136
5137static int ip6_route_info_append(struct net *net,
5138 struct list_head *rt6_nh_list,
5139 struct fib6_info *rt,
5140 struct fib6_config *r_cfg)
5141{
5142 struct rt6_nh *nh;
5143 int err = -EEXIST;
5144
5145 list_for_each_entry(nh, rt6_nh_list, next) {
5146
5147 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
5148 return err;
5149 }
5150
5151 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
5152 if (!nh)
5153 return -ENOMEM;
5154 nh->fib6_info = rt;
5155 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
5156 list_add_tail(&nh->next, rt6_nh_list);
5157
5158 return 0;
5159}
5160
5161static void ip6_route_mpath_notify(struct fib6_info *rt,
5162 struct fib6_info *rt_last,
5163 struct nl_info *info,
5164 __u16 nlflags)
5165{
5166
5167
5168
5169
5170
5171
5172 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
5173 rt = list_first_entry(&rt_last->fib6_siblings,
5174 struct fib6_info,
5175 fib6_siblings);
5176 }
5177
5178 if (rt)
5179 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
5180}
5181
5182static bool ip6_route_mpath_should_notify(const struct fib6_info *rt)
5183{
5184 bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
5185 bool should_notify = false;
5186 struct fib6_info *leaf;
5187 struct fib6_node *fn;
5188
5189 rcu_read_lock();
5190 fn = rcu_dereference(rt->fib6_node);
5191 if (!fn)
5192 goto out;
5193
5194 leaf = rcu_dereference(fn->leaf);
5195 if (!leaf)
5196 goto out;
5197
5198 if (rt == leaf ||
5199 (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric &&
5200 rt6_qualify_for_ecmp(leaf)))
5201 should_notify = true;
5202out:
5203 rcu_read_unlock();
5204
5205 return should_notify;
5206}
5207
5208static int ip6_route_multipath_add(struct fib6_config *cfg,
5209 struct netlink_ext_ack *extack)
5210{
5211 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
5212 struct nl_info *info = &cfg->fc_nlinfo;
5213 struct fib6_config r_cfg;
5214 struct rtnexthop *rtnh;
5215 struct fib6_info *rt;
5216 struct rt6_nh *err_nh;
5217 struct rt6_nh *nh, *nh_safe;
5218 __u16 nlflags;
5219 int remaining;
5220 int attrlen;
5221 int err = 1;
5222 int nhn = 0;
5223 int replace = (cfg->fc_nlinfo.nlh &&
5224 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
5225 LIST_HEAD(rt6_nh_list);
5226
5227 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
5228 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
5229 nlflags |= NLM_F_APPEND;
5230
5231 remaining = cfg->fc_mp_len;
5232 rtnh = (struct rtnexthop *)cfg->fc_mp;
5233
5234
5235
5236
5237 while (rtnh_ok(rtnh, remaining)) {
5238 memcpy(&r_cfg, cfg, sizeof(*cfg));
5239 if (rtnh->rtnh_ifindex)
5240 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5241
5242 attrlen = rtnh_attrlen(rtnh);
5243 if (attrlen > 0) {
5244 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5245
5246 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5247 if (nla) {
5248 r_cfg.fc_gateway = nla_get_in6_addr(nla);
5249 r_cfg.fc_flags |= RTF_GATEWAY;
5250 }
5251 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
5252 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
5253 if (nla)
5254 r_cfg.fc_encap_type = nla_get_u16(nla);
5255 }
5256
5257 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
5258 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
5259 if (IS_ERR(rt)) {
5260 err = PTR_ERR(rt);
5261 rt = NULL;
5262 goto cleanup;
5263 }
5264 if (!rt6_qualify_for_ecmp(rt)) {
5265 err = -EINVAL;
5266 NL_SET_ERR_MSG(extack,
5267 "Device only routes can not be added for IPv6 using the multipath API.");
5268 fib6_info_release(rt);
5269 goto cleanup;
5270 }
5271
5272 rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1;
5273
5274 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
5275 rt, &r_cfg);
5276 if (err) {
5277 fib6_info_release(rt);
5278 goto cleanup;
5279 }
5280
5281 rtnh = rtnh_next(rtnh, &remaining);
5282 }
5283
5284 if (list_empty(&rt6_nh_list)) {
5285 NL_SET_ERR_MSG(extack,
5286 "Invalid nexthop configuration - no valid nexthops");
5287 return -EINVAL;
5288 }
5289
5290
5291
5292
5293
5294 info->skip_notify = 1;
5295
5296
5297
5298
5299 info->skip_notify_kernel = 1;
5300
5301 err_nh = NULL;
5302 list_for_each_entry(nh, &rt6_nh_list, next) {
5303 err = __ip6_ins_rt(nh->fib6_info, info, extack);
5304 fib6_info_release(nh->fib6_info);
5305
5306 if (!err) {
5307
5308 rt_last = nh->fib6_info;
5309
5310
5311 if (!rt_notif)
5312 rt_notif = nh->fib6_info;
5313 }
5314
5315
5316 nh->fib6_info = NULL;
5317 if (err) {
5318 if (replace && nhn)
5319 NL_SET_ERR_MSG_MOD(extack,
5320 "multipath route replace failed (check consistency of installed routes)");
5321 err_nh = nh;
5322 goto add_errout;
5323 }
5324
5325
5326
5327
5328
5329
5330
5331
5332 if (cfg->fc_nlinfo.nlh) {
5333 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
5334 NLM_F_REPLACE);
5335 cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
5336 }
5337 nhn++;
5338 }
5339
5340
5341
5342
5343
5344
5345 if (ip6_route_mpath_should_notify(rt_notif)) {
5346 enum fib_event_type fib_event;
5347
5348 if (rt_notif->fib6_nsiblings != nhn - 1)
5349 fib_event = FIB_EVENT_ENTRY_APPEND;
5350 else
5351 fib_event = FIB_EVENT_ENTRY_REPLACE;
5352
5353 err = call_fib6_multipath_entry_notifiers(info->nl_net,
5354 fib_event, rt_notif,
5355 nhn - 1, extack);
5356 if (err) {
5357
5358 err_nh = NULL;
5359 goto add_errout;
5360 }
5361 }
5362
5363
5364 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5365 goto cleanup;
5366
5367add_errout:
5368
5369
5370
5371
5372 if (rt_notif)
5373 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5374
5375
5376 list_for_each_entry(nh, &rt6_nh_list, next) {
5377 if (err_nh == nh)
5378 break;
5379 ip6_route_del(&nh->r_cfg, extack);
5380 }
5381
5382cleanup:
5383 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
5384 if (nh->fib6_info)
5385 fib6_info_release(nh->fib6_info);
5386 list_del(&nh->next);
5387 kfree(nh);
5388 }
5389
5390 return err;
5391}
5392
5393static int ip6_route_multipath_del(struct fib6_config *cfg,
5394 struct netlink_ext_ack *extack)
5395{
5396 struct fib6_config r_cfg;
5397 struct rtnexthop *rtnh;
5398 int last_err = 0;
5399 int remaining;
5400 int attrlen;
5401 int err;
5402
5403 remaining = cfg->fc_mp_len;
5404 rtnh = (struct rtnexthop *)cfg->fc_mp;
5405
5406
5407 while (rtnh_ok(rtnh, remaining)) {
5408 memcpy(&r_cfg, cfg, sizeof(*cfg));
5409 if (rtnh->rtnh_ifindex)
5410 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5411
5412 attrlen = rtnh_attrlen(rtnh);
5413 if (attrlen > 0) {
5414 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5415
5416 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5417 if (nla) {
5418 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
5419 r_cfg.fc_flags |= RTF_GATEWAY;
5420 }
5421 }
5422 err = ip6_route_del(&r_cfg, extack);
5423 if (err)
5424 last_err = err;
5425
5426 rtnh = rtnh_next(rtnh, &remaining);
5427 }
5428
5429 return last_err;
5430}
5431
5432static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5433 struct netlink_ext_ack *extack)
5434{
5435 struct fib6_config cfg;
5436 int err;
5437
5438 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
5439 if (err < 0)
5440 return err;
5441
5442 if (cfg.fc_nh_id &&
5443 !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) {
5444 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
5445 return -EINVAL;
5446 }
5447
5448 if (cfg.fc_mp)
5449 return ip6_route_multipath_del(&cfg, extack);
5450 else {
5451 cfg.fc_delete_all_nh = 1;
5452 return ip6_route_del(&cfg, extack);
5453 }
5454}
5455
5456static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5457 struct netlink_ext_ack *extack)
5458{
5459 struct fib6_config cfg;
5460 int err;
5461
5462 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
5463 if (err < 0)
5464 return err;
5465
5466 if (cfg.fc_metric == 0)
5467 cfg.fc_metric = IP6_RT_PRIO_USER;
5468
5469 if (cfg.fc_mp)
5470 return ip6_route_multipath_add(&cfg, extack);
5471 else
5472 return ip6_route_add(&cfg, GFP_KERNEL, extack);
5473}
5474
5475
5476static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg)
5477{
5478 int *nexthop_len = arg;
5479
5480 *nexthop_len += nla_total_size(0)
5481 + NLA_ALIGN(sizeof(struct rtnexthop))
5482 + nla_total_size(16);
5483
5484 if (nh->fib_nh_lws) {
5485
5486 *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5487
5488 *nexthop_len += nla_total_size(2);
5489 }
5490
5491 return 0;
5492}
5493
5494static size_t rt6_nlmsg_size(struct fib6_info *f6i)
5495{
5496 int nexthop_len;
5497
5498 if (f6i->nh) {
5499 nexthop_len = nla_total_size(4);
5500 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size,
5501 &nexthop_len);
5502 } else {
5503 struct fib6_nh *nh = f6i->fib6_nh;
5504
5505 nexthop_len = 0;
5506 if (f6i->fib6_nsiblings) {
5507 nexthop_len = nla_total_size(0)
5508 + NLA_ALIGN(sizeof(struct rtnexthop))
5509 + nla_total_size(16)
5510 + lwtunnel_get_encap_size(nh->fib_nh_lws);
5511
5512 nexthop_len *= f6i->fib6_nsiblings;
5513 }
5514 nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5515 }
5516
5517 return NLMSG_ALIGN(sizeof(struct rtmsg))
5518 + nla_total_size(16)
5519 + nla_total_size(16)
5520 + nla_total_size(16)
5521 + nla_total_size(16)
5522 + nla_total_size(4)
5523 + nla_total_size(4)
5524 + nla_total_size(4)
5525 + nla_total_size(4)
5526 + RTAX_MAX * nla_total_size(4)
5527 + nla_total_size(sizeof(struct rta_cacheinfo))
5528 + nla_total_size(TCP_CA_NAME_MAX)
5529 + nla_total_size(1)
5530 + nexthop_len;
5531}
5532
5533static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh,
5534 unsigned char *flags)
5535{
5536 if (nexthop_is_multipath(nh)) {
5537 struct nlattr *mp;
5538
5539 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
5540 if (!mp)
5541 goto nla_put_failure;
5542
5543 if (nexthop_mpath_fill_node(skb, nh, AF_INET6))
5544 goto nla_put_failure;
5545
5546 nla_nest_end(skb, mp);
5547 } else {
5548 struct fib6_nh *fib6_nh;
5549
5550 fib6_nh = nexthop_fib6_nh(nh);
5551 if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6,
5552 flags, false) < 0)
5553 goto nla_put_failure;
5554 }
5555
5556 return 0;
5557
5558nla_put_failure:
5559 return -EMSGSIZE;
5560}
5561
5562static int rt6_fill_node(struct net *net, struct sk_buff *skb,
5563 struct fib6_info *rt, struct dst_entry *dst,
5564 struct in6_addr *dest, struct in6_addr *src,
5565 int iif, int type, u32 portid, u32 seq,
5566 unsigned int flags)
5567{
5568 struct rt6_info *rt6 = (struct rt6_info *)dst;
5569 struct rt6key *rt6_dst, *rt6_src;
5570 u32 *pmetrics, table, rt6_flags;
5571 unsigned char nh_flags = 0;
5572 struct nlmsghdr *nlh;
5573 struct rtmsg *rtm;
5574 long expires = 0;
5575
5576 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
5577 if (!nlh)
5578 return -EMSGSIZE;
5579
5580 if (rt6) {
5581 rt6_dst = &rt6->rt6i_dst;
5582 rt6_src = &rt6->rt6i_src;
5583 rt6_flags = rt6->rt6i_flags;
5584 } else {
5585 rt6_dst = &rt->fib6_dst;
5586 rt6_src = &rt->fib6_src;
5587 rt6_flags = rt->fib6_flags;
5588 }
5589
5590 rtm = nlmsg_data(nlh);
5591 rtm->rtm_family = AF_INET6;
5592 rtm->rtm_dst_len = rt6_dst->plen;
5593 rtm->rtm_src_len = rt6_src->plen;
5594 rtm->rtm_tos = 0;
5595 if (rt->fib6_table)
5596 table = rt->fib6_table->tb6_id;
5597 else
5598 table = RT6_TABLE_UNSPEC;
5599 rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
5600 if (nla_put_u32(skb, RTA_TABLE, table))
5601 goto nla_put_failure;
5602
5603 rtm->rtm_type = rt->fib6_type;
5604 rtm->rtm_flags = 0;
5605 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
5606 rtm->rtm_protocol = rt->fib6_protocol;
5607
5608 if (rt6_flags & RTF_CACHE)
5609 rtm->rtm_flags |= RTM_F_CLONED;
5610
5611 if (dest) {
5612 if (nla_put_in6_addr(skb, RTA_DST, dest))
5613 goto nla_put_failure;
5614 rtm->rtm_dst_len = 128;
5615 } else if (rtm->rtm_dst_len)
5616 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
5617 goto nla_put_failure;
5618#ifdef CONFIG_IPV6_SUBTREES
5619 if (src) {
5620 if (nla_put_in6_addr(skb, RTA_SRC, src))
5621 goto nla_put_failure;
5622 rtm->rtm_src_len = 128;
5623 } else if (rtm->rtm_src_len &&
5624 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
5625 goto nla_put_failure;
5626#endif
5627 if (iif) {
5628#ifdef CONFIG_IPV6_MROUTE
5629 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
5630 int err = ip6mr_get_route(net, skb, rtm, portid);
5631
5632 if (err == 0)
5633 return 0;
5634 if (err < 0)
5635 goto nla_put_failure;
5636 } else
5637#endif
5638 if (nla_put_u32(skb, RTA_IIF, iif))
5639 goto nla_put_failure;
5640 } else if (dest) {
5641 struct in6_addr saddr_buf;
5642 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
5643 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
5644 goto nla_put_failure;
5645 }
5646
5647 if (rt->fib6_prefsrc.plen) {
5648 struct in6_addr saddr_buf;
5649 saddr_buf = rt->fib6_prefsrc.addr;
5650 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
5651 goto nla_put_failure;
5652 }
5653
5654 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
5655 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
5656 goto nla_put_failure;
5657
5658 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
5659 goto nla_put_failure;
5660
5661
5662
5663
5664 if (rt6) {
5665 if (rt6_flags & RTF_GATEWAY &&
5666 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
5667 goto nla_put_failure;
5668
5669 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
5670 goto nla_put_failure;
5671
5672 if (dst->lwtstate &&
5673 lwtunnel_fill_encap(skb, dst->lwtstate, RTA_ENCAP, RTA_ENCAP_TYPE) < 0)
5674 goto nla_put_failure;
5675 } else if (rt->fib6_nsiblings) {
5676 struct fib6_info *sibling, *next_sibling;
5677 struct nlattr *mp;
5678
5679 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
5680 if (!mp)
5681 goto nla_put_failure;
5682
5683 if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common,
5684 rt->fib6_nh->fib_nh_weight, AF_INET6,
5685 0) < 0)
5686 goto nla_put_failure;
5687
5688 list_for_each_entry_safe(sibling, next_sibling,
5689 &rt->fib6_siblings, fib6_siblings) {
5690 if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common,
5691 sibling->fib6_nh->fib_nh_weight,
5692 AF_INET6, 0) < 0)
5693 goto nla_put_failure;
5694 }
5695
5696 nla_nest_end(skb, mp);
5697 } else if (rt->nh) {
5698 if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id))
5699 goto nla_put_failure;
5700
5701 if (nexthop_is_blackhole(rt->nh))
5702 rtm->rtm_type = RTN_BLACKHOLE;
5703
5704 if (net->ipv4.sysctl_nexthop_compat_mode &&
5705 rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0)
5706 goto nla_put_failure;
5707
5708 rtm->rtm_flags |= nh_flags;
5709 } else {
5710 if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6,
5711 &nh_flags, false) < 0)
5712 goto nla_put_failure;
5713
5714 rtm->rtm_flags |= nh_flags;
5715 }
5716
5717 if (rt6_flags & RTF_EXPIRES) {
5718 expires = dst ? dst->expires : rt->expires;
5719 expires -= jiffies;
5720 }
5721
5722 if (!dst) {
5723 if (rt->offload)
5724 rtm->rtm_flags |= RTM_F_OFFLOAD;
5725 if (rt->trap)
5726 rtm->rtm_flags |= RTM_F_TRAP;
5727 if (rt->offload_failed)
5728 rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED;
5729 }
5730
5731 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
5732 goto nla_put_failure;
5733
5734 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
5735 goto nla_put_failure;
5736
5737
5738 nlmsg_end(skb, nlh);
5739 return 0;
5740
5741nla_put_failure:
5742 nlmsg_cancel(skb, nlh);
5743 return -EMSGSIZE;
5744}
5745
5746static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg)
5747{
5748 const struct net_device *dev = arg;
5749
5750 if (nh->fib_nh_dev == dev)
5751 return 1;
5752
5753 return 0;
5754}
5755
5756static bool fib6_info_uses_dev(const struct fib6_info *f6i,
5757 const struct net_device *dev)
5758{
5759 if (f6i->nh) {
5760 struct net_device *_dev = (struct net_device *)dev;
5761
5762 return !!nexthop_for_each_fib6_nh(f6i->nh,
5763 fib6_info_nh_uses_dev,
5764 _dev);
5765 }
5766
5767 if (f6i->fib6_nh->fib_nh_dev == dev)
5768 return true;
5769
5770 if (f6i->fib6_nsiblings) {
5771 struct fib6_info *sibling, *next_sibling;
5772
5773 list_for_each_entry_safe(sibling, next_sibling,
5774 &f6i->fib6_siblings, fib6_siblings) {
5775 if (sibling->fib6_nh->fib_nh_dev == dev)
5776 return true;
5777 }
5778 }
5779
5780 return false;
5781}
5782
5783struct fib6_nh_exception_dump_walker {
5784 struct rt6_rtnl_dump_arg *dump;
5785 struct fib6_info *rt;
5786 unsigned int flags;
5787 unsigned int skip;
5788 unsigned int count;
5789};
5790
5791static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg)
5792{
5793 struct fib6_nh_exception_dump_walker *w = arg;
5794 struct rt6_rtnl_dump_arg *dump = w->dump;
5795 struct rt6_exception_bucket *bucket;
5796 struct rt6_exception *rt6_ex;
5797 int i, err;
5798
5799 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
5800 if (!bucket)
5801 return 0;
5802
5803 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
5804 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
5805 if (w->skip) {
5806 w->skip--;
5807 continue;
5808 }
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821 if (rt6_check_expired(rt6_ex->rt6i)) {
5822 w->count++;
5823 continue;
5824 }
5825
5826 err = rt6_fill_node(dump->net, dump->skb, w->rt,
5827 &rt6_ex->rt6i->dst, NULL, NULL, 0,
5828 RTM_NEWROUTE,
5829 NETLINK_CB(dump->cb->skb).portid,
5830 dump->cb->nlh->nlmsg_seq, w->flags);
5831 if (err)
5832 return err;
5833
5834 w->count++;
5835 }
5836 bucket++;
5837 }
5838
5839 return 0;
5840}
5841
5842
5843int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)
5844{
5845 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
5846 struct fib_dump_filter *filter = &arg->filter;
5847 unsigned int flags = NLM_F_MULTI;
5848 struct net *net = arg->net;
5849 int count = 0;
5850
5851 if (rt == net->ipv6.fib6_null_entry)
5852 return -1;
5853
5854 if ((filter->flags & RTM_F_PREFIX) &&
5855 !(rt->fib6_flags & RTF_PREFIX_RT)) {
5856
5857 return -1;
5858 }
5859 if (filter->filter_set &&
5860 ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
5861 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
5862 (filter->protocol && rt->fib6_protocol != filter->protocol))) {
5863 return -1;
5864 }
5865
5866 if (filter->filter_set ||
5867 !filter->dump_routes || !filter->dump_exceptions) {
5868 flags |= NLM_F_DUMP_FILTERED;
5869 }
5870
5871 if (filter->dump_routes) {
5872 if (skip) {
5873 skip--;
5874 } else {
5875 if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
5876 0, RTM_NEWROUTE,
5877 NETLINK_CB(arg->cb->skb).portid,
5878 arg->cb->nlh->nlmsg_seq, flags)) {
5879 return 0;
5880 }
5881 count++;
5882 }
5883 }
5884
5885 if (filter->dump_exceptions) {
5886 struct fib6_nh_exception_dump_walker w = { .dump = arg,
5887 .rt = rt,
5888 .flags = flags,
5889 .skip = skip,
5890 .count = 0 };
5891 int err;
5892
5893 rcu_read_lock();
5894 if (rt->nh) {
5895 err = nexthop_for_each_fib6_nh(rt->nh,
5896 rt6_nh_dump_exceptions,
5897 &w);
5898 } else {
5899 err = rt6_nh_dump_exceptions(rt->fib6_nh, &w);
5900 }
5901 rcu_read_unlock();
5902
5903 if (err)
5904 return count += w.count;
5905 }
5906
5907 return -1;
5908}
5909
5910static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
5911 const struct nlmsghdr *nlh,
5912 struct nlattr **tb,
5913 struct netlink_ext_ack *extack)
5914{
5915 struct rtmsg *rtm;
5916 int i, err;
5917
5918 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
5919 NL_SET_ERR_MSG_MOD(extack,
5920 "Invalid header for get route request");
5921 return -EINVAL;
5922 }
5923
5924 if (!netlink_strict_get_check(skb))
5925 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5926 rtm_ipv6_policy, extack);
5927
5928 rtm = nlmsg_data(nlh);
5929 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
5930 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
5931 rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
5932 rtm->rtm_type) {
5933 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
5934 return -EINVAL;
5935 }
5936 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
5937 NL_SET_ERR_MSG_MOD(extack,
5938 "Invalid flags for get route request");
5939 return -EINVAL;
5940 }
5941
5942 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
5943 rtm_ipv6_policy, extack);
5944 if (err)
5945 return err;
5946
5947 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
5948 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
5949 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
5950 return -EINVAL;
5951 }
5952
5953 for (i = 0; i <= RTA_MAX; i++) {
5954 if (!tb[i])
5955 continue;
5956
5957 switch (i) {
5958 case RTA_SRC:
5959 case RTA_DST:
5960 case RTA_IIF:
5961 case RTA_OIF:
5962 case RTA_MARK:
5963 case RTA_UID:
5964 case RTA_SPORT:
5965 case RTA_DPORT:
5966 case RTA_IP_PROTO:
5967 break;
5968 default:
5969 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
5970 return -EINVAL;
5971 }
5972 }
5973
5974 return 0;
5975}
5976
5977static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5978 struct netlink_ext_ack *extack)
5979{
5980 struct net *net = sock_net(in_skb->sk);
5981 struct nlattr *tb[RTA_MAX+1];
5982 int err, iif = 0, oif = 0;
5983 struct fib6_info *from;
5984 struct dst_entry *dst;
5985 struct rt6_info *rt;
5986 struct sk_buff *skb;
5987 struct rtmsg *rtm;
5988 struct flowi6 fl6 = {};
5989 bool fibmatch;
5990
5991 err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
5992 if (err < 0)
5993 goto errout;
5994
5995 err = -EINVAL;
5996 rtm = nlmsg_data(nlh);
5997 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
5998 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
5999
6000 if (tb[RTA_SRC]) {
6001 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
6002 goto errout;
6003
6004 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
6005 }
6006
6007 if (tb[RTA_DST]) {
6008 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
6009 goto errout;
6010
6011 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
6012 }
6013
6014 if (tb[RTA_IIF])
6015 iif = nla_get_u32(tb[RTA_IIF]);
6016
6017 if (tb[RTA_OIF])
6018 oif = nla_get_u32(tb[RTA_OIF]);
6019
6020 if (tb[RTA_MARK])
6021 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
6022
6023 if (tb[RTA_UID])
6024 fl6.flowi6_uid = make_kuid(current_user_ns(),
6025 nla_get_u32(tb[RTA_UID]));
6026 else
6027 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
6028
6029 if (tb[RTA_SPORT])
6030 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
6031
6032 if (tb[RTA_DPORT])
6033 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
6034
6035 if (tb[RTA_IP_PROTO]) {
6036 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
6037 &fl6.flowi6_proto, AF_INET6,
6038 extack);
6039 if (err)
6040 goto errout;
6041 }
6042
6043 if (iif) {
6044 struct net_device *dev;
6045 int flags = 0;
6046
6047 rcu_read_lock();
6048
6049 dev = dev_get_by_index_rcu(net, iif);
6050 if (!dev) {
6051 rcu_read_unlock();
6052 err = -ENODEV;
6053 goto errout;
6054 }
6055
6056 fl6.flowi6_iif = iif;
6057
6058 if (!ipv6_addr_any(&fl6.saddr))
6059 flags |= RT6_LOOKUP_F_HAS_SADDR;
6060
6061 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
6062
6063 rcu_read_unlock();
6064 } else {
6065 fl6.flowi6_oif = oif;
6066
6067 dst = ip6_route_output(net, NULL, &fl6);
6068 }
6069
6070
6071 rt = container_of(dst, struct rt6_info, dst);
6072 if (rt->dst.error) {
6073 err = rt->dst.error;
6074 ip6_rt_put(rt);
6075 goto errout;
6076 }
6077
6078 if (rt == net->ipv6.ip6_null_entry) {
6079 err = rt->dst.error;
6080 ip6_rt_put(rt);
6081 goto errout;
6082 }
6083
6084 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
6085 if (!skb) {
6086 ip6_rt_put(rt);
6087 err = -ENOBUFS;
6088 goto errout;
6089 }
6090
6091 skb_dst_set(skb, &rt->dst);
6092
6093 rcu_read_lock();
6094 from = rcu_dereference(rt->from);
6095 if (from) {
6096 if (fibmatch)
6097 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
6098 iif, RTM_NEWROUTE,
6099 NETLINK_CB(in_skb).portid,
6100 nlh->nlmsg_seq, 0);
6101 else
6102 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
6103 &fl6.saddr, iif, RTM_NEWROUTE,
6104 NETLINK_CB(in_skb).portid,
6105 nlh->nlmsg_seq, 0);
6106 } else {
6107 err = -ENETUNREACH;
6108 }
6109 rcu_read_unlock();
6110
6111 if (err < 0) {
6112 kfree_skb(skb);
6113 goto errout;
6114 }
6115
6116 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
6117errout:
6118 return err;
6119}
6120
6121void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
6122 unsigned int nlm_flags)
6123{
6124 struct sk_buff *skb;
6125 struct net *net = info->nl_net;
6126 u32 seq;
6127 int err;
6128
6129 err = -ENOBUFS;
6130 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6131
6132 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6133 if (!skb)
6134 goto errout;
6135
6136 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6137 event, info->portid, seq, nlm_flags);
6138 if (err < 0) {
6139
6140 WARN_ON(err == -EMSGSIZE);
6141 kfree_skb(skb);
6142 goto errout;
6143 }
6144 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6145 info->nlh, gfp_any());
6146 return;
6147errout:
6148 if (err < 0)
6149 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6150}
6151
6152void fib6_rt_update(struct net *net, struct fib6_info *rt,
6153 struct nl_info *info)
6154{
6155 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6156 struct sk_buff *skb;
6157 int err = -ENOBUFS;
6158
6159 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6160 if (!skb)
6161 goto errout;
6162
6163 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6164 RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
6165 if (err < 0) {
6166
6167 WARN_ON(err == -EMSGSIZE);
6168 kfree_skb(skb);
6169 goto errout;
6170 }
6171 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6172 info->nlh, gfp_any());
6173 return;
6174errout:
6175 if (err < 0)
6176 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6177}
6178
6179void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
6180 bool offload, bool trap, bool offload_failed)
6181{
6182 struct sk_buff *skb;
6183 int err;
6184
6185 if (f6i->offload == offload && f6i->trap == trap &&
6186 f6i->offload_failed == offload_failed)
6187 return;
6188
6189 f6i->offload = offload;
6190 f6i->trap = trap;
6191
6192
6193 if (net->ipv6.sysctl.fib_notify_on_flag_change == 2 &&
6194 f6i->offload_failed == offload_failed)
6195 return;
6196
6197 f6i->offload_failed = offload_failed;
6198
6199 if (!rcu_access_pointer(f6i->fib6_node))
6200
6201
6202
6203 return;
6204
6205 if (!net->ipv6.sysctl.fib_notify_on_flag_change)
6206 return;
6207
6208 skb = nlmsg_new(rt6_nlmsg_size(f6i), GFP_KERNEL);
6209 if (!skb) {
6210 err = -ENOBUFS;
6211 goto errout;
6212 }
6213
6214 err = rt6_fill_node(net, skb, f6i, NULL, NULL, NULL, 0, RTM_NEWROUTE, 0,
6215 0, 0);
6216 if (err < 0) {
6217
6218 WARN_ON(err == -EMSGSIZE);
6219 kfree_skb(skb);
6220 goto errout;
6221 }
6222
6223 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_ROUTE, NULL, GFP_KERNEL);
6224 return;
6225
6226errout:
6227 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6228}
6229EXPORT_SYMBOL(fib6_info_hw_flags_set);
6230
6231static int ip6_route_dev_notify(struct notifier_block *this,
6232 unsigned long event, void *ptr)
6233{
6234 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6235 struct net *net = dev_net(dev);
6236
6237 if (!(dev->flags & IFF_LOOPBACK))
6238 return NOTIFY_OK;
6239
6240 if (event == NETDEV_REGISTER) {
6241 net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev;
6242 net->ipv6.ip6_null_entry->dst.dev = dev;
6243 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
6244#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6245 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
6246 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
6247 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
6248 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
6249#endif
6250 } else if (event == NETDEV_UNREGISTER &&
6251 dev->reg_state != NETREG_UNREGISTERED) {
6252
6253
6254
6255 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
6256#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6257 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
6258 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
6259#endif
6260 }
6261
6262 return NOTIFY_OK;
6263}
6264
6265
6266
6267
6268
6269#ifdef CONFIG_PROC_FS
6270static int rt6_stats_seq_show(struct seq_file *seq, void *v)
6271{
6272 struct net *net = (struct net *)seq->private;
6273 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
6274 net->ipv6.rt6_stats->fib_nodes,
6275 net->ipv6.rt6_stats->fib_route_nodes,
6276 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
6277 net->ipv6.rt6_stats->fib_rt_entries,
6278 net->ipv6.rt6_stats->fib_rt_cache,
6279 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
6280 net->ipv6.rt6_stats->fib_discarded_routes);
6281
6282 return 0;
6283}
6284#endif
6285
6286#ifdef CONFIG_SYSCTL
6287
6288static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
6289 void *buffer, size_t *lenp, loff_t *ppos)
6290{
6291 struct net *net;
6292 int delay;
6293 int ret;
6294 if (!write)
6295 return -EINVAL;
6296
6297 net = (struct net *)ctl->extra1;
6298 delay = net->ipv6.sysctl.flush_delay;
6299 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6300 if (ret)
6301 return ret;
6302
6303 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
6304 return 0;
6305}
6306
6307static struct ctl_table ipv6_route_table_template[] = {
6308 {
6309 .procname = "flush",
6310 .data = &init_net.ipv6.sysctl.flush_delay,
6311 .maxlen = sizeof(int),
6312 .mode = 0200,
6313 .proc_handler = ipv6_sysctl_rtcache_flush
6314 },
6315 {
6316 .procname = "gc_thresh",
6317 .data = &ip6_dst_ops_template.gc_thresh,
6318 .maxlen = sizeof(int),
6319 .mode = 0644,
6320 .proc_handler = proc_dointvec,
6321 },
6322 {
6323 .procname = "max_size",
6324 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
6325 .maxlen = sizeof(int),
6326 .mode = 0644,
6327 .proc_handler = proc_dointvec,
6328 },
6329 {
6330 .procname = "gc_min_interval",
6331 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
6332 .maxlen = sizeof(int),
6333 .mode = 0644,
6334 .proc_handler = proc_dointvec_jiffies,
6335 },
6336 {
6337 .procname = "gc_timeout",
6338 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
6339 .maxlen = sizeof(int),
6340 .mode = 0644,
6341 .proc_handler = proc_dointvec_jiffies,
6342 },
6343 {
6344 .procname = "gc_interval",
6345 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
6346 .maxlen = sizeof(int),
6347 .mode = 0644,
6348 .proc_handler = proc_dointvec_jiffies,
6349 },
6350 {
6351 .procname = "gc_elasticity",
6352 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
6353 .maxlen = sizeof(int),
6354 .mode = 0644,
6355 .proc_handler = proc_dointvec,
6356 },
6357 {
6358 .procname = "mtu_expires",
6359 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
6360 .maxlen = sizeof(int),
6361 .mode = 0644,
6362 .proc_handler = proc_dointvec_jiffies,
6363 },
6364 {
6365 .procname = "min_adv_mss",
6366 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
6367 .maxlen = sizeof(int),
6368 .mode = 0644,
6369 .proc_handler = proc_dointvec,
6370 },
6371 {
6372 .procname = "gc_min_interval_ms",
6373 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
6374 .maxlen = sizeof(int),
6375 .mode = 0644,
6376 .proc_handler = proc_dointvec_ms_jiffies,
6377 },
6378 {
6379 .procname = "skip_notify_on_dev_down",
6380 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
6381 .maxlen = sizeof(int),
6382 .mode = 0644,
6383 .proc_handler = proc_dointvec_minmax,
6384 .extra1 = SYSCTL_ZERO,
6385 .extra2 = SYSCTL_ONE,
6386 },
6387 { }
6388};
6389
6390struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
6391{
6392 struct ctl_table *table;
6393
6394 table = kmemdup(ipv6_route_table_template,
6395 sizeof(ipv6_route_table_template),
6396 GFP_KERNEL);
6397
6398 if (table) {
6399 table[0].data = &net->ipv6.sysctl.flush_delay;
6400 table[0].extra1 = net;
6401 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
6402 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
6403 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6404 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
6405 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
6406 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
6407 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
6408 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
6409 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6410 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
6411
6412
6413 if (net->user_ns != &init_user_ns)
6414 table[0].procname = NULL;
6415 }
6416
6417 return table;
6418}
6419#endif
6420
6421static int __net_init ip6_route_net_init(struct net *net)
6422{
6423 int ret = -ENOMEM;
6424
6425 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
6426 sizeof(net->ipv6.ip6_dst_ops));
6427
6428 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
6429 goto out_ip6_dst_ops;
6430
6431 net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true);
6432 if (!net->ipv6.fib6_null_entry)
6433 goto out_ip6_dst_entries;
6434 memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template,
6435 sizeof(*net->ipv6.fib6_null_entry));
6436
6437 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
6438 sizeof(*net->ipv6.ip6_null_entry),
6439 GFP_KERNEL);
6440 if (!net->ipv6.ip6_null_entry)
6441 goto out_fib6_null_entry;
6442 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6443 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
6444 ip6_template_metrics, true);
6445 INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached);
6446
6447#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6448 net->ipv6.fib6_has_custom_rules = false;
6449 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
6450 sizeof(*net->ipv6.ip6_prohibit_entry),
6451 GFP_KERNEL);
6452 if (!net->ipv6.ip6_prohibit_entry)
6453 goto out_ip6_null_entry;
6454 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6455 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
6456 ip6_template_metrics, true);
6457 INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached);
6458
6459 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
6460 sizeof(*net->ipv6.ip6_blk_hole_entry),
6461 GFP_KERNEL);
6462 if (!net->ipv6.ip6_blk_hole_entry)
6463 goto out_ip6_prohibit_entry;
6464 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6465 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
6466 ip6_template_metrics, true);
6467 INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
6468#ifdef CONFIG_IPV6_SUBTREES
6469 net->ipv6.fib6_routes_require_src = 0;
6470#endif
6471#endif
6472
6473 net->ipv6.sysctl.flush_delay = 0;
6474 net->ipv6.sysctl.ip6_rt_max_size = 4096;
6475 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
6476 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
6477 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
6478 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
6479 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
6480 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
6481 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
6482
6483 net->ipv6.ip6_rt_gc_expire = 30*HZ;
6484
6485 ret = 0;
6486out:
6487 return ret;
6488
6489#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6490out_ip6_prohibit_entry:
6491 kfree(net->ipv6.ip6_prohibit_entry);
6492out_ip6_null_entry:
6493 kfree(net->ipv6.ip6_null_entry);
6494#endif
6495out_fib6_null_entry:
6496 kfree(net->ipv6.fib6_null_entry);
6497out_ip6_dst_entries:
6498 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
6499out_ip6_dst_ops:
6500 goto out;
6501}
6502
6503static void __net_exit ip6_route_net_exit(struct net *net)
6504{
6505 kfree(net->ipv6.fib6_null_entry);
6506 kfree(net->ipv6.ip6_null_entry);
6507#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6508 kfree(net->ipv6.ip6_prohibit_entry);
6509 kfree(net->ipv6.ip6_blk_hole_entry);
6510#endif
6511 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
6512}
6513
6514static int __net_init ip6_route_net_init_late(struct net *net)
6515{
6516#ifdef CONFIG_PROC_FS
6517 proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
6518 sizeof(struct ipv6_route_iter));
6519 proc_create_net_single("rt6_stats", 0444, net->proc_net,
6520 rt6_stats_seq_show, NULL);
6521#endif
6522 return 0;
6523}
6524
6525static void __net_exit ip6_route_net_exit_late(struct net *net)
6526{
6527#ifdef CONFIG_PROC_FS
6528 remove_proc_entry("ipv6_route", net->proc_net);
6529 remove_proc_entry("rt6_stats", net->proc_net);
6530#endif
6531}
6532
6533static struct pernet_operations ip6_route_net_ops = {
6534 .init = ip6_route_net_init,
6535 .exit = ip6_route_net_exit,
6536};
6537
6538static int __net_init ipv6_inetpeer_init(struct net *net)
6539{
6540 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
6541
6542 if (!bp)
6543 return -ENOMEM;
6544 inet_peer_base_init(bp);
6545 net->ipv6.peers = bp;
6546 return 0;
6547}
6548
6549static void __net_exit ipv6_inetpeer_exit(struct net *net)
6550{
6551 struct inet_peer_base *bp = net->ipv6.peers;
6552
6553 net->ipv6.peers = NULL;
6554 inetpeer_invalidate_tree(bp);
6555 kfree(bp);
6556}
6557
6558static struct pernet_operations ipv6_inetpeer_ops = {
6559 .init = ipv6_inetpeer_init,
6560 .exit = ipv6_inetpeer_exit,
6561};
6562
6563static struct pernet_operations ip6_route_net_late_ops = {
6564 .init = ip6_route_net_init_late,
6565 .exit = ip6_route_net_exit_late,
6566};
6567
6568static struct notifier_block ip6_route_dev_notifier = {
6569 .notifier_call = ip6_route_dev_notify,
6570 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
6571};
6572
6573void __init ip6_route_init_special_entries(void)
6574{
6575
6576
6577
6578 init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev;
6579 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
6580 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6581 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6582 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
6583 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6584 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
6585 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6586 #endif
6587}
6588
6589#if IS_BUILTIN(CONFIG_IPV6)
6590#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6591DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt)
6592
6593BTF_ID_LIST(btf_fib6_info_id)
6594BTF_ID(struct, fib6_info)
6595
6596static const struct bpf_iter_seq_info ipv6_route_seq_info = {
6597 .seq_ops = &ipv6_route_seq_ops,
6598 .init_seq_private = bpf_iter_init_seq_net,
6599 .fini_seq_private = bpf_iter_fini_seq_net,
6600 .seq_priv_size = sizeof(struct ipv6_route_iter),
6601};
6602
6603static struct bpf_iter_reg ipv6_route_reg_info = {
6604 .target = "ipv6_route",
6605 .ctx_arg_info_size = 1,
6606 .ctx_arg_info = {
6607 { offsetof(struct bpf_iter__ipv6_route, rt),
6608 PTR_TO_BTF_ID_OR_NULL },
6609 },
6610 .seq_info = &ipv6_route_seq_info,
6611};
6612
6613static int __init bpf_iter_register(void)
6614{
6615 ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id;
6616 return bpf_iter_reg_target(&ipv6_route_reg_info);
6617}
6618
6619static void bpf_iter_unregister(void)
6620{
6621 bpf_iter_unreg_target(&ipv6_route_reg_info);
6622}
6623#endif
6624#endif
6625
6626int __init ip6_route_init(void)
6627{
6628 int ret;
6629 int cpu;
6630
6631 ret = -ENOMEM;
6632 ip6_dst_ops_template.kmem_cachep =
6633 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
6634 SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT, NULL);
6635 if (!ip6_dst_ops_template.kmem_cachep)
6636 goto out;
6637
6638 ret = dst_entries_init(&ip6_dst_blackhole_ops);
6639 if (ret)
6640 goto out_kmem_cache;
6641
6642 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
6643 if (ret)
6644 goto out_dst_entries;
6645
6646 ret = register_pernet_subsys(&ip6_route_net_ops);
6647 if (ret)
6648 goto out_register_inetpeer;
6649
6650 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
6651
6652 ret = fib6_init();
6653 if (ret)
6654 goto out_register_subsys;
6655
6656 ret = xfrm6_init();
6657 if (ret)
6658 goto out_fib6_init;
6659
6660 ret = fib6_rules_init();
6661 if (ret)
6662 goto xfrm6_init;
6663
6664 ret = register_pernet_subsys(&ip6_route_net_late_ops);
6665 if (ret)
6666 goto fib6_rules_init;
6667
6668 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
6669 inet6_rtm_newroute, NULL, 0);
6670 if (ret < 0)
6671 goto out_register_late_subsys;
6672
6673 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
6674 inet6_rtm_delroute, NULL, 0);
6675 if (ret < 0)
6676 goto out_register_late_subsys;
6677
6678 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
6679 inet6_rtm_getroute, NULL,
6680 RTNL_FLAG_DOIT_UNLOCKED);
6681 if (ret < 0)
6682 goto out_register_late_subsys;
6683
6684 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
6685 if (ret)
6686 goto out_register_late_subsys;
6687
6688#if IS_BUILTIN(CONFIG_IPV6)
6689#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6690 ret = bpf_iter_register();
6691 if (ret)
6692 goto out_register_late_subsys;
6693#endif
6694#endif
6695
6696 for_each_possible_cpu(cpu) {
6697 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
6698
6699 INIT_LIST_HEAD(&ul->head);
6700 spin_lock_init(&ul->lock);
6701 }
6702
6703out:
6704 return ret;
6705
6706out_register_late_subsys:
6707 rtnl_unregister_all(PF_INET6);
6708 unregister_pernet_subsys(&ip6_route_net_late_ops);
6709fib6_rules_init:
6710 fib6_rules_cleanup();
6711xfrm6_init:
6712 xfrm6_fini();
6713out_fib6_init:
6714 fib6_gc_cleanup();
6715out_register_subsys:
6716 unregister_pernet_subsys(&ip6_route_net_ops);
6717out_register_inetpeer:
6718 unregister_pernet_subsys(&ipv6_inetpeer_ops);
6719out_dst_entries:
6720 dst_entries_destroy(&ip6_dst_blackhole_ops);
6721out_kmem_cache:
6722 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
6723 goto out;
6724}
6725
6726void ip6_route_cleanup(void)
6727{
6728#if IS_BUILTIN(CONFIG_IPV6)
6729#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6730 bpf_iter_unregister();
6731#endif
6732#endif
6733 unregister_netdevice_notifier(&ip6_route_dev_notifier);
6734 unregister_pernet_subsys(&ip6_route_net_late_ops);
6735 fib6_rules_cleanup();
6736 xfrm6_fini();
6737 fib6_gc_cleanup();
6738 unregister_pernet_subsys(&ipv6_inetpeer_ops);
6739 unregister_pernet_subsys(&ip6_route_net_ops);
6740 dst_entries_destroy(&ip6_dst_blackhole_ops);
6741 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
6742}
6743