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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 err = 0;
1661
1662 spin_lock_bh(&rt6_exception_lock);
1663
1664 bucket = rcu_dereference_protected(nh->rt6i_exception_bucket,
1665 lockdep_is_held(&rt6_exception_lock));
1666 if (!bucket) {
1667 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1668 GFP_ATOMIC);
1669 if (!bucket) {
1670 err = -ENOMEM;
1671 goto out;
1672 }
1673 rcu_assign_pointer(nh->rt6i_exception_bucket, bucket);
1674 } else if (fib6_nh_excptn_bucket_flushed(bucket)) {
1675 err = -EINVAL;
1676 goto out;
1677 }
1678
1679#ifdef CONFIG_IPV6_SUBTREES
1680
1681
1682
1683
1684
1685
1686 if (f6i->fib6_src.plen)
1687 src_key = &nrt->rt6i_src.addr;
1688#endif
1689
1690
1691
1692
1693 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
1694 err = -EINVAL;
1695 goto out;
1696 }
1697
1698 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1699 src_key);
1700 if (rt6_ex)
1701 rt6_remove_exception(bucket, rt6_ex);
1702
1703 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1704 if (!rt6_ex) {
1705 err = -ENOMEM;
1706 goto out;
1707 }
1708 rt6_ex->rt6i = nrt;
1709 rt6_ex->stamp = jiffies;
1710 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1711 bucket->depth++;
1712 net->ipv6.rt6_stats->fib_rt_cache++;
1713
1714 if (bucket->depth > FIB6_MAX_DEPTH)
1715 rt6_exception_remove_oldest(bucket);
1716
1717out:
1718 spin_unlock_bh(&rt6_exception_lock);
1719
1720
1721 if (!err) {
1722 spin_lock_bh(&f6i->fib6_table->tb6_lock);
1723 fib6_update_sernum(net, f6i);
1724 spin_unlock_bh(&f6i->fib6_table->tb6_lock);
1725 fib6_force_start_gc(net);
1726 }
1727
1728 return err;
1729}
1730
1731static void fib6_nh_flush_exceptions(struct fib6_nh *nh, struct fib6_info *from)
1732{
1733 struct rt6_exception_bucket *bucket;
1734 struct rt6_exception *rt6_ex;
1735 struct hlist_node *tmp;
1736 int i;
1737
1738 spin_lock_bh(&rt6_exception_lock);
1739
1740 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1741 if (!bucket)
1742 goto out;
1743
1744
1745 if (!from)
1746 fib6_nh_excptn_bucket_set_flushed(nh, &rt6_exception_lock);
1747
1748 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1749 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist) {
1750 if (!from ||
1751 rcu_access_pointer(rt6_ex->rt6i->from) == from)
1752 rt6_remove_exception(bucket, rt6_ex);
1753 }
1754 WARN_ON_ONCE(!from && bucket->depth);
1755 bucket++;
1756 }
1757out:
1758 spin_unlock_bh(&rt6_exception_lock);
1759}
1760
1761static int rt6_nh_flush_exceptions(struct fib6_nh *nh, void *arg)
1762{
1763 struct fib6_info *f6i = arg;
1764
1765 fib6_nh_flush_exceptions(nh, f6i);
1766
1767 return 0;
1768}
1769
1770void rt6_flush_exceptions(struct fib6_info *f6i)
1771{
1772 if (f6i->nh)
1773 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_flush_exceptions,
1774 f6i);
1775 else
1776 fib6_nh_flush_exceptions(f6i->fib6_nh, f6i);
1777}
1778
1779
1780
1781
1782static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
1783 const struct in6_addr *daddr,
1784 const struct in6_addr *saddr)
1785{
1786 const struct in6_addr *src_key = NULL;
1787 struct rt6_exception_bucket *bucket;
1788 struct rt6_exception *rt6_ex;
1789 struct rt6_info *ret = NULL;
1790
1791#ifdef CONFIG_IPV6_SUBTREES
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803 if (res->f6i->fib6_src.plen)
1804 src_key = saddr;
1805find_ex:
1806#endif
1807 bucket = fib6_nh_get_excptn_bucket(res->nh, NULL);
1808 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1809
1810 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
1811 ret = rt6_ex->rt6i;
1812
1813#ifdef CONFIG_IPV6_SUBTREES
1814
1815 if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) {
1816 src_key = &res->f6i->fib6_src.addr;
1817 goto find_ex;
1818 }
1819#endif
1820
1821 return ret;
1822}
1823
1824
1825static int fib6_nh_remove_exception(const struct fib6_nh *nh, int plen,
1826 const struct rt6_info *rt)
1827{
1828 const struct in6_addr *src_key = NULL;
1829 struct rt6_exception_bucket *bucket;
1830 struct rt6_exception *rt6_ex;
1831 int err;
1832
1833 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
1834 return -ENOENT;
1835
1836 spin_lock_bh(&rt6_exception_lock);
1837 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
1838
1839#ifdef CONFIG_IPV6_SUBTREES
1840
1841
1842
1843
1844
1845
1846 if (plen)
1847 src_key = &rt->rt6i_src.addr;
1848#endif
1849 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1850 &rt->rt6i_dst.addr,
1851 src_key);
1852 if (rt6_ex) {
1853 rt6_remove_exception(bucket, rt6_ex);
1854 err = 0;
1855 } else {
1856 err = -ENOENT;
1857 }
1858
1859 spin_unlock_bh(&rt6_exception_lock);
1860 return err;
1861}
1862
1863struct fib6_nh_excptn_arg {
1864 struct rt6_info *rt;
1865 int plen;
1866};
1867
1868static int rt6_nh_remove_exception_rt(struct fib6_nh *nh, void *_arg)
1869{
1870 struct fib6_nh_excptn_arg *arg = _arg;
1871 int err;
1872
1873 err = fib6_nh_remove_exception(nh, arg->plen, arg->rt);
1874 if (err == 0)
1875 return 1;
1876
1877 return 0;
1878}
1879
1880static int rt6_remove_exception_rt(struct rt6_info *rt)
1881{
1882 struct fib6_info *from;
1883
1884 from = rcu_dereference(rt->from);
1885 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1886 return -EINVAL;
1887
1888 if (from->nh) {
1889 struct fib6_nh_excptn_arg arg = {
1890 .rt = rt,
1891 .plen = from->fib6_src.plen
1892 };
1893 int rc;
1894
1895
1896 rc = nexthop_for_each_fib6_nh(from->nh,
1897 rt6_nh_remove_exception_rt,
1898 &arg);
1899 return rc ? 0 : -ENOENT;
1900 }
1901
1902 return fib6_nh_remove_exception(from->fib6_nh,
1903 from->fib6_src.plen, rt);
1904}
1905
1906
1907
1908
1909static void fib6_nh_update_exception(const struct fib6_nh *nh, int plen,
1910 const struct rt6_info *rt)
1911{
1912 const struct in6_addr *src_key = NULL;
1913 struct rt6_exception_bucket *bucket;
1914 struct rt6_exception *rt6_ex;
1915
1916 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
1917#ifdef CONFIG_IPV6_SUBTREES
1918
1919
1920
1921
1922
1923
1924 if (plen)
1925 src_key = &rt->rt6i_src.addr;
1926#endif
1927 rt6_ex = __rt6_find_exception_rcu(&bucket, &rt->rt6i_dst.addr, src_key);
1928 if (rt6_ex)
1929 rt6_ex->stamp = jiffies;
1930}
1931
1932struct fib6_nh_match_arg {
1933 const struct net_device *dev;
1934 const struct in6_addr *gw;
1935 struct fib6_nh *match;
1936};
1937
1938
1939static int fib6_nh_find_match(struct fib6_nh *nh, void *_arg)
1940{
1941 struct fib6_nh_match_arg *arg = _arg;
1942
1943 if (arg->dev != nh->fib_nh_dev ||
1944 (arg->gw && !nh->fib_nh_gw_family) ||
1945 (!arg->gw && nh->fib_nh_gw_family) ||
1946 (arg->gw && !ipv6_addr_equal(arg->gw, &nh->fib_nh_gw6)))
1947 return 0;
1948
1949 arg->match = nh;
1950
1951
1952 return 1;
1953}
1954
1955static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1956{
1957 struct fib6_info *from;
1958 struct fib6_nh *fib6_nh;
1959
1960 rcu_read_lock();
1961
1962 from = rcu_dereference(rt->from);
1963 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1964 goto unlock;
1965
1966 if (from->nh) {
1967 struct fib6_nh_match_arg arg = {
1968 .dev = rt->dst.dev,
1969 .gw = &rt->rt6i_gateway,
1970 };
1971
1972 nexthop_for_each_fib6_nh(from->nh, fib6_nh_find_match, &arg);
1973
1974 if (!arg.match)
1975 goto unlock;
1976 fib6_nh = arg.match;
1977 } else {
1978 fib6_nh = from->fib6_nh;
1979 }
1980 fib6_nh_update_exception(fib6_nh, from->fib6_src.plen, rt);
1981unlock:
1982 rcu_read_unlock();
1983}
1984
1985static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1986 struct rt6_info *rt, int mtu)
1987{
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998 if (dst_mtu(&rt->dst) >= mtu)
1999 return true;
2000
2001 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
2002 return true;
2003
2004 return false;
2005}
2006
2007static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
2008 const struct fib6_nh *nh, int mtu)
2009{
2010 struct rt6_exception_bucket *bucket;
2011 struct rt6_exception *rt6_ex;
2012 int i;
2013
2014 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2015 if (!bucket)
2016 return;
2017
2018 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2019 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
2020 struct rt6_info *entry = rt6_ex->rt6i;
2021
2022
2023
2024
2025
2026 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
2027 rt6_mtu_change_route_allowed(idev, entry, mtu))
2028 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
2029 }
2030 bucket++;
2031 }
2032}
2033
2034#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2035
2036static void fib6_nh_exceptions_clean_tohost(const struct fib6_nh *nh,
2037 const struct in6_addr *gateway)
2038{
2039 struct rt6_exception_bucket *bucket;
2040 struct rt6_exception *rt6_ex;
2041 struct hlist_node *tmp;
2042 int i;
2043
2044 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
2045 return;
2046
2047 spin_lock_bh(&rt6_exception_lock);
2048 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2049 if (bucket) {
2050 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2051 hlist_for_each_entry_safe(rt6_ex, tmp,
2052 &bucket->chain, hlist) {
2053 struct rt6_info *entry = rt6_ex->rt6i;
2054
2055 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
2056 RTF_CACHE_GATEWAY &&
2057 ipv6_addr_equal(gateway,
2058 &entry->rt6i_gateway)) {
2059 rt6_remove_exception(bucket, rt6_ex);
2060 }
2061 }
2062 bucket++;
2063 }
2064 }
2065
2066 spin_unlock_bh(&rt6_exception_lock);
2067}
2068
2069static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
2070 struct rt6_exception *rt6_ex,
2071 struct fib6_gc_args *gc_args,
2072 unsigned long now)
2073{
2074 struct rt6_info *rt = rt6_ex->rt6i;
2075
2076
2077
2078
2079
2080
2081
2082 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
2083 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
2084 RT6_TRACE("aging clone %p\n", rt);
2085 rt6_remove_exception(bucket, rt6_ex);
2086 return;
2087 }
2088 } else if (time_after(jiffies, rt->dst.expires)) {
2089 RT6_TRACE("purging expired route %p\n", rt);
2090 rt6_remove_exception(bucket, rt6_ex);
2091 return;
2092 }
2093
2094 if (rt->rt6i_flags & RTF_GATEWAY) {
2095 struct neighbour *neigh;
2096
2097 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
2098
2099 if (!(neigh && (neigh->flags & NTF_ROUTER))) {
2100 RT6_TRACE("purging route %p via non-router but gateway\n",
2101 rt);
2102 rt6_remove_exception(bucket, rt6_ex);
2103 return;
2104 }
2105 }
2106
2107 gc_args->more++;
2108}
2109
2110static void fib6_nh_age_exceptions(const struct fib6_nh *nh,
2111 struct fib6_gc_args *gc_args,
2112 unsigned long now)
2113{
2114 struct rt6_exception_bucket *bucket;
2115 struct rt6_exception *rt6_ex;
2116 struct hlist_node *tmp;
2117 int i;
2118
2119 if (!rcu_access_pointer(nh->rt6i_exception_bucket))
2120 return;
2121
2122 rcu_read_lock_bh();
2123 spin_lock(&rt6_exception_lock);
2124 bucket = fib6_nh_get_excptn_bucket(nh, &rt6_exception_lock);
2125 if (bucket) {
2126 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
2127 hlist_for_each_entry_safe(rt6_ex, tmp,
2128 &bucket->chain, hlist) {
2129 rt6_age_examine_exception(bucket, rt6_ex,
2130 gc_args, now);
2131 }
2132 bucket++;
2133 }
2134 }
2135 spin_unlock(&rt6_exception_lock);
2136 rcu_read_unlock_bh();
2137}
2138
2139struct fib6_nh_age_excptn_arg {
2140 struct fib6_gc_args *gc_args;
2141 unsigned long now;
2142};
2143
2144static int rt6_nh_age_exceptions(struct fib6_nh *nh, void *_arg)
2145{
2146 struct fib6_nh_age_excptn_arg *arg = _arg;
2147
2148 fib6_nh_age_exceptions(nh, arg->gc_args, arg->now);
2149 return 0;
2150}
2151
2152void rt6_age_exceptions(struct fib6_info *f6i,
2153 struct fib6_gc_args *gc_args,
2154 unsigned long now)
2155{
2156 if (f6i->nh) {
2157 struct fib6_nh_age_excptn_arg arg = {
2158 .gc_args = gc_args,
2159 .now = now
2160 };
2161
2162 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_age_exceptions,
2163 &arg);
2164 } else {
2165 fib6_nh_age_exceptions(f6i->fib6_nh, gc_args, now);
2166 }
2167}
2168
2169
2170int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
2171 struct flowi6 *fl6, struct fib6_result *res, int strict)
2172{
2173 struct fib6_node *fn, *saved_fn;
2174
2175 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
2176 saved_fn = fn;
2177
2178 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2179 oif = 0;
2180
2181redo_rt6_select:
2182 rt6_select(net, fn, oif, res, strict);
2183 if (res->f6i == net->ipv6.fib6_null_entry) {
2184 fn = fib6_backtrack(fn, &fl6->saddr);
2185 if (fn)
2186 goto redo_rt6_select;
2187 else if (strict & RT6_LOOKUP_F_REACHABLE) {
2188
2189 strict &= ~RT6_LOOKUP_F_REACHABLE;
2190 fn = saved_fn;
2191 goto redo_rt6_select;
2192 }
2193 }
2194
2195 trace_fib6_table_lookup(net, res, table, fl6);
2196
2197 return 0;
2198}
2199
2200struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
2201 int oif, struct flowi6 *fl6,
2202 const struct sk_buff *skb, int flags)
2203{
2204 struct fib6_result res = {};
2205 struct rt6_info *rt = NULL;
2206 int strict = 0;
2207
2208 WARN_ON_ONCE((flags & RT6_LOOKUP_F_DST_NOREF) &&
2209 !rcu_read_lock_held());
2210
2211 strict |= flags & RT6_LOOKUP_F_IFACE;
2212 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
2213 if (net->ipv6.devconf_all->forwarding == 0)
2214 strict |= RT6_LOOKUP_F_REACHABLE;
2215
2216 rcu_read_lock();
2217
2218 fib6_table_lookup(net, table, oif, fl6, &res, strict);
2219 if (res.f6i == net->ipv6.fib6_null_entry)
2220 goto out;
2221
2222 fib6_select_path(net, &res, fl6, oif, false, skb, strict);
2223
2224
2225 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
2226 if (rt) {
2227 goto out;
2228 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
2229 !res.nh->fib_nh_gw_family)) {
2230
2231
2232
2233
2234
2235 rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
2236
2237 if (rt) {
2238
2239
2240
2241
2242
2243 rt6_uncached_list_add(rt);
2244 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
2245 rcu_read_unlock();
2246
2247 return rt;
2248 }
2249 } else {
2250
2251 local_bh_disable();
2252 rt = rt6_get_pcpu_route(&res);
2253
2254 if (!rt)
2255 rt = rt6_make_pcpu_route(net, &res);
2256
2257 local_bh_enable();
2258 }
2259out:
2260 if (!rt)
2261 rt = net->ipv6.ip6_null_entry;
2262 if (!(flags & RT6_LOOKUP_F_DST_NOREF))
2263 ip6_hold_safe(net, &rt);
2264 rcu_read_unlock();
2265
2266 return rt;
2267}
2268EXPORT_SYMBOL_GPL(ip6_pol_route);
2269
2270INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_input(struct net *net,
2271 struct fib6_table *table,
2272 struct flowi6 *fl6,
2273 const struct sk_buff *skb,
2274 int flags)
2275{
2276 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
2277}
2278
2279struct dst_entry *ip6_route_input_lookup(struct net *net,
2280 struct net_device *dev,
2281 struct flowi6 *fl6,
2282 const struct sk_buff *skb,
2283 int flags)
2284{
2285 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
2286 flags |= RT6_LOOKUP_F_IFACE;
2287
2288 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
2289}
2290EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
2291
2292static void ip6_multipath_l3_keys(const struct sk_buff *skb,
2293 struct flow_keys *keys,
2294 struct flow_keys *flkeys)
2295{
2296 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
2297 const struct ipv6hdr *key_iph = outer_iph;
2298 struct flow_keys *_flkeys = flkeys;
2299 const struct ipv6hdr *inner_iph;
2300 const struct icmp6hdr *icmph;
2301 struct ipv6hdr _inner_iph;
2302 struct icmp6hdr _icmph;
2303
2304 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
2305 goto out;
2306
2307 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
2308 sizeof(_icmph), &_icmph);
2309 if (!icmph)
2310 goto out;
2311
2312 if (!icmpv6_is_err(icmph->icmp6_type))
2313 goto out;
2314
2315 inner_iph = skb_header_pointer(skb,
2316 skb_transport_offset(skb) + sizeof(*icmph),
2317 sizeof(_inner_iph), &_inner_iph);
2318 if (!inner_iph)
2319 goto out;
2320
2321 key_iph = inner_iph;
2322 _flkeys = NULL;
2323out:
2324 if (_flkeys) {
2325 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
2326 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
2327 keys->tags.flow_label = _flkeys->tags.flow_label;
2328 keys->basic.ip_proto = _flkeys->basic.ip_proto;
2329 } else {
2330 keys->addrs.v6addrs.src = key_iph->saddr;
2331 keys->addrs.v6addrs.dst = key_iph->daddr;
2332 keys->tags.flow_label = ip6_flowlabel(key_iph);
2333 keys->basic.ip_proto = key_iph->nexthdr;
2334 }
2335}
2336
2337static u32 rt6_multipath_custom_hash_outer(const struct net *net,
2338 const struct sk_buff *skb,
2339 bool *p_has_inner)
2340{
2341 u32 hash_fields = ip6_multipath_hash_fields(net);
2342 struct flow_keys keys, hash_keys;
2343
2344 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK))
2345 return 0;
2346
2347 memset(&hash_keys, 0, sizeof(hash_keys));
2348 skb_flow_dissect_flow_keys(skb, &keys, FLOW_DISSECTOR_F_STOP_AT_ENCAP);
2349
2350 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2351 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP)
2352 hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src;
2353 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP)
2354 hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst;
2355 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
2356 hash_keys.basic.ip_proto = keys.basic.ip_proto;
2357 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL)
2358 hash_keys.tags.flow_label = keys.tags.flow_label;
2359 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT)
2360 hash_keys.ports.src = keys.ports.src;
2361 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT)
2362 hash_keys.ports.dst = keys.ports.dst;
2363
2364 *p_has_inner = !!(keys.control.flags & FLOW_DIS_ENCAPSULATION);
2365 return flow_hash_from_keys(&hash_keys);
2366}
2367
2368static u32 rt6_multipath_custom_hash_inner(const struct net *net,
2369 const struct sk_buff *skb,
2370 bool has_inner)
2371{
2372 u32 hash_fields = ip6_multipath_hash_fields(net);
2373 struct flow_keys keys, hash_keys;
2374
2375
2376
2377
2378
2379 if (!has_inner)
2380 return 0;
2381
2382 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_MASK))
2383 return 0;
2384
2385 memset(&hash_keys, 0, sizeof(hash_keys));
2386 skb_flow_dissect_flow_keys(skb, &keys, 0);
2387
2388 if (!(keys.control.flags & FLOW_DIS_ENCAPSULATION))
2389 return 0;
2390
2391 if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2392 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2393 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP)
2394 hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src;
2395 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP)
2396 hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst;
2397 } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2398 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2399 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP)
2400 hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src;
2401 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP)
2402 hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst;
2403 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL)
2404 hash_keys.tags.flow_label = keys.tags.flow_label;
2405 }
2406
2407 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO)
2408 hash_keys.basic.ip_proto = keys.basic.ip_proto;
2409 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT)
2410 hash_keys.ports.src = keys.ports.src;
2411 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT)
2412 hash_keys.ports.dst = keys.ports.dst;
2413
2414 return flow_hash_from_keys(&hash_keys);
2415}
2416
2417static u32 rt6_multipath_custom_hash_skb(const struct net *net,
2418 const struct sk_buff *skb)
2419{
2420 u32 mhash, mhash_inner;
2421 bool has_inner = true;
2422
2423 mhash = rt6_multipath_custom_hash_outer(net, skb, &has_inner);
2424 mhash_inner = rt6_multipath_custom_hash_inner(net, skb, has_inner);
2425
2426 return jhash_2words(mhash, mhash_inner, 0);
2427}
2428
2429static u32 rt6_multipath_custom_hash_fl6(const struct net *net,
2430 const struct flowi6 *fl6)
2431{
2432 u32 hash_fields = ip6_multipath_hash_fields(net);
2433 struct flow_keys hash_keys;
2434
2435 if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK))
2436 return 0;
2437
2438 memset(&hash_keys, 0, sizeof(hash_keys));
2439 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2440 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP)
2441 hash_keys.addrs.v6addrs.src = fl6->saddr;
2442 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP)
2443 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2444 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO)
2445 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2446 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_FLOWLABEL)
2447 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2448 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT)
2449 hash_keys.ports.src = fl6->fl6_sport;
2450 if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT)
2451 hash_keys.ports.dst = fl6->fl6_dport;
2452
2453 return flow_hash_from_keys(&hash_keys);
2454}
2455
2456
2457u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
2458 const struct sk_buff *skb, struct flow_keys *flkeys)
2459{
2460 struct flow_keys hash_keys;
2461 u32 mhash = 0;
2462
2463 switch (ip6_multipath_hash_policy(net)) {
2464 case 0:
2465 memset(&hash_keys, 0, sizeof(hash_keys));
2466 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2467 if (skb) {
2468 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2469 } else {
2470 hash_keys.addrs.v6addrs.src = fl6->saddr;
2471 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2472 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2473 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2474 }
2475 mhash = flow_hash_from_keys(&hash_keys);
2476 break;
2477 case 1:
2478 if (skb) {
2479 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
2480 struct flow_keys keys;
2481
2482
2483 if (skb->l4_hash)
2484 return skb_get_hash_raw(skb) >> 1;
2485
2486 memset(&hash_keys, 0, sizeof(hash_keys));
2487
2488 if (!flkeys) {
2489 skb_flow_dissect_flow_keys(skb, &keys, flag);
2490 flkeys = &keys;
2491 }
2492 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2493 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2494 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2495 hash_keys.ports.src = flkeys->ports.src;
2496 hash_keys.ports.dst = flkeys->ports.dst;
2497 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2498 } else {
2499 memset(&hash_keys, 0, sizeof(hash_keys));
2500 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2501 hash_keys.addrs.v6addrs.src = fl6->saddr;
2502 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2503 hash_keys.ports.src = fl6->fl6_sport;
2504 hash_keys.ports.dst = fl6->fl6_dport;
2505 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2506 }
2507 mhash = flow_hash_from_keys(&hash_keys);
2508 break;
2509 case 2:
2510 memset(&hash_keys, 0, sizeof(hash_keys));
2511 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2512 if (skb) {
2513 struct flow_keys keys;
2514
2515 if (!flkeys) {
2516 skb_flow_dissect_flow_keys(skb, &keys, 0);
2517 flkeys = &keys;
2518 }
2519
2520
2521 if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
2522 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
2523 hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src;
2524 hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst;
2525 } else if (flkeys->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
2526 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2527 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2528 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2529 hash_keys.tags.flow_label = flkeys->tags.flow_label;
2530 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2531 } else {
2532
2533 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2534 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2535 }
2536 } else {
2537
2538 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2539 hash_keys.addrs.v6addrs.src = fl6->saddr;
2540 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2541 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2542 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2543 }
2544 mhash = flow_hash_from_keys(&hash_keys);
2545 break;
2546 case 3:
2547 if (skb)
2548 mhash = rt6_multipath_custom_hash_skb(net, skb);
2549 else
2550 mhash = rt6_multipath_custom_hash_fl6(net, fl6);
2551 break;
2552 }
2553
2554 return mhash >> 1;
2555}
2556
2557
2558void ip6_route_input(struct sk_buff *skb)
2559{
2560 const struct ipv6hdr *iph = ipv6_hdr(skb);
2561 struct net *net = dev_net(skb->dev);
2562 int flags = RT6_LOOKUP_F_HAS_SADDR | RT6_LOOKUP_F_DST_NOREF;
2563 struct ip_tunnel_info *tun_info;
2564 struct flowi6 fl6 = {
2565 .flowi6_iif = skb->dev->ifindex,
2566 .daddr = iph->daddr,
2567 .saddr = iph->saddr,
2568 .flowlabel = ip6_flowinfo(iph),
2569 .flowi6_mark = skb->mark,
2570 .flowi6_proto = iph->nexthdr,
2571 };
2572 struct flow_keys *flkeys = NULL, _flkeys;
2573
2574 tun_info = skb_tunnel_info(skb);
2575 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
2576 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
2577
2578 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2579 flkeys = &_flkeys;
2580
2581 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
2582 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
2583 skb_dst_drop(skb);
2584 skb_dst_set_noref(skb, ip6_route_input_lookup(net, skb->dev,
2585 &fl6, skb, flags));
2586}
2587
2588INDIRECT_CALLABLE_SCOPE struct rt6_info *ip6_pol_route_output(struct net *net,
2589 struct fib6_table *table,
2590 struct flowi6 *fl6,
2591 const struct sk_buff *skb,
2592 int flags)
2593{
2594 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
2595}
2596
2597struct dst_entry *ip6_route_output_flags_noref(struct net *net,
2598 const struct sock *sk,
2599 struct flowi6 *fl6, int flags)
2600{
2601 bool any_src;
2602
2603 if (ipv6_addr_type(&fl6->daddr) &
2604 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
2605 struct dst_entry *dst;
2606
2607
2608 dst = l3mdev_link_scope_lookup(net, fl6);
2609 if (dst)
2610 return dst;
2611 }
2612
2613 fl6->flowi6_iif = LOOPBACK_IFINDEX;
2614
2615 flags |= RT6_LOOKUP_F_DST_NOREF;
2616 any_src = ipv6_addr_any(&fl6->saddr);
2617 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
2618 (fl6->flowi6_oif && any_src))
2619 flags |= RT6_LOOKUP_F_IFACE;
2620
2621 if (!any_src)
2622 flags |= RT6_LOOKUP_F_HAS_SADDR;
2623 else if (sk)
2624 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
2625
2626 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
2627}
2628EXPORT_SYMBOL_GPL(ip6_route_output_flags_noref);
2629
2630struct dst_entry *ip6_route_output_flags(struct net *net,
2631 const struct sock *sk,
2632 struct flowi6 *fl6,
2633 int flags)
2634{
2635 struct dst_entry *dst;
2636 struct rt6_info *rt6;
2637
2638 rcu_read_lock();
2639 dst = ip6_route_output_flags_noref(net, sk, fl6, flags);
2640 rt6 = (struct rt6_info *)dst;
2641
2642 if (list_empty(&rt6->rt6i_uncached) && !dst_hold_safe(dst)) {
2643 dst = &net->ipv6.ip6_null_entry->dst;
2644 dst_hold(dst);
2645 }
2646 rcu_read_unlock();
2647
2648 return dst;
2649}
2650EXPORT_SYMBOL_GPL(ip6_route_output_flags);
2651
2652struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
2653{
2654 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
2655 struct net_device *loopback_dev = net->loopback_dev;
2656 struct dst_entry *new = NULL;
2657
2658 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
2659 DST_OBSOLETE_DEAD, 0);
2660 if (rt) {
2661 rt6_info_init(rt);
2662 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
2663
2664 new = &rt->dst;
2665 new->__use = 1;
2666 new->input = dst_discard;
2667 new->output = dst_discard_out;
2668
2669 dst_copy_metrics(new, &ort->dst);
2670
2671 rt->rt6i_idev = in6_dev_get(loopback_dev);
2672 rt->rt6i_gateway = ort->rt6i_gateway;
2673 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
2674
2675 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2676#ifdef CONFIG_IPV6_SUBTREES
2677 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2678#endif
2679 }
2680
2681 dst_release(dst_orig);
2682 return new ? new : ERR_PTR(-ENOMEM);
2683}
2684
2685
2686
2687
2688
2689static bool fib6_check(struct fib6_info *f6i, u32 cookie)
2690{
2691 u32 rt_cookie = 0;
2692
2693 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
2694 return false;
2695
2696 if (fib6_check_expired(f6i))
2697 return false;
2698
2699 return true;
2700}
2701
2702static struct dst_entry *rt6_check(struct rt6_info *rt,
2703 struct fib6_info *from,
2704 u32 cookie)
2705{
2706 u32 rt_cookie = 0;
2707
2708 if (!from || !fib6_get_cookie_safe(from, &rt_cookie) ||
2709 rt_cookie != cookie)
2710 return NULL;
2711
2712 if (rt6_check_expired(rt))
2713 return NULL;
2714
2715 return &rt->dst;
2716}
2717
2718static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2719 struct fib6_info *from,
2720 u32 cookie)
2721{
2722 if (!__rt6_check_expired(rt) &&
2723 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
2724 fib6_check(from, cookie))
2725 return &rt->dst;
2726 else
2727 return NULL;
2728}
2729
2730INDIRECT_CALLABLE_SCOPE struct dst_entry *ip6_dst_check(struct dst_entry *dst,
2731 u32 cookie)
2732{
2733 struct dst_entry *dst_ret;
2734 struct fib6_info *from;
2735 struct rt6_info *rt;
2736
2737 rt = container_of(dst, struct rt6_info, dst);
2738
2739 if (rt->sernum)
2740 return rt6_is_valid(rt) ? dst : NULL;
2741
2742 rcu_read_lock();
2743
2744
2745
2746
2747
2748
2749 from = rcu_dereference(rt->from);
2750
2751 if (from && (rt->rt6i_flags & RTF_PCPU ||
2752 unlikely(!list_empty(&rt->rt6i_uncached))))
2753 dst_ret = rt6_dst_from_check(rt, from, cookie);
2754 else
2755 dst_ret = rt6_check(rt, from, cookie);
2756
2757 rcu_read_unlock();
2758
2759 return dst_ret;
2760}
2761EXPORT_INDIRECT_CALLABLE(ip6_dst_check);
2762
2763static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2764{
2765 struct rt6_info *rt = (struct rt6_info *) dst;
2766
2767 if (rt) {
2768 if (rt->rt6i_flags & RTF_CACHE) {
2769 rcu_read_lock();
2770 if (rt6_check_expired(rt)) {
2771 rt6_remove_exception_rt(rt);
2772 dst = NULL;
2773 }
2774 rcu_read_unlock();
2775 } else {
2776 dst_release(dst);
2777 dst = NULL;
2778 }
2779 }
2780 return dst;
2781}
2782
2783static void ip6_link_failure(struct sk_buff *skb)
2784{
2785 struct rt6_info *rt;
2786
2787 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
2788
2789 rt = (struct rt6_info *) skb_dst(skb);
2790 if (rt) {
2791 rcu_read_lock();
2792 if (rt->rt6i_flags & RTF_CACHE) {
2793 rt6_remove_exception_rt(rt);
2794 } else {
2795 struct fib6_info *from;
2796 struct fib6_node *fn;
2797
2798 from = rcu_dereference(rt->from);
2799 if (from) {
2800 fn = rcu_dereference(from->fib6_node);
2801 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2802 fn->fn_sernum = -1;
2803 }
2804 }
2805 rcu_read_unlock();
2806 }
2807}
2808
2809static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2810{
2811 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2812 struct fib6_info *from;
2813
2814 rcu_read_lock();
2815 from = rcu_dereference(rt0->from);
2816 if (from)
2817 rt0->dst.expires = from->expires;
2818 rcu_read_unlock();
2819 }
2820
2821 dst_set_expires(&rt0->dst, timeout);
2822 rt0->rt6i_flags |= RTF_EXPIRES;
2823}
2824
2825static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2826{
2827 struct net *net = dev_net(rt->dst.dev);
2828
2829 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
2830 rt->rt6i_flags |= RTF_MODIFIED;
2831 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2832}
2833
2834static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2835{
2836 return !(rt->rt6i_flags & RTF_CACHE) &&
2837 (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
2838}
2839
2840static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
2841 const struct ipv6hdr *iph, u32 mtu,
2842 bool confirm_neigh)
2843{
2844 const struct in6_addr *daddr, *saddr;
2845 struct rt6_info *rt6 = (struct rt6_info *)dst;
2846
2847
2848
2849
2850
2851
2852 if (iph) {
2853 daddr = &iph->daddr;
2854 saddr = &iph->saddr;
2855 } else if (sk) {
2856 daddr = &sk->sk_v6_daddr;
2857 saddr = &inet6_sk(sk)->saddr;
2858 } else {
2859 daddr = NULL;
2860 saddr = NULL;
2861 }
2862
2863 if (confirm_neigh)
2864 dst_confirm_neigh(dst, daddr);
2865
2866 if (mtu < IPV6_MIN_MTU)
2867 return;
2868 if (mtu >= dst_mtu(dst))
2869 return;
2870
2871 if (!rt6_cache_allowed_for_pmtu(rt6)) {
2872 rt6_do_update_pmtu(rt6, mtu);
2873
2874 if (rt6->rt6i_flags & RTF_CACHE)
2875 rt6_update_exception_stamp_rt(rt6);
2876 } else if (daddr) {
2877 struct fib6_result res = {};
2878 struct rt6_info *nrt6;
2879
2880 rcu_read_lock();
2881 res.f6i = rcu_dereference(rt6->from);
2882 if (!res.f6i)
2883 goto out_unlock;
2884
2885 res.fib6_flags = res.f6i->fib6_flags;
2886 res.fib6_type = res.f6i->fib6_type;
2887
2888 if (res.f6i->nh) {
2889 struct fib6_nh_match_arg arg = {
2890 .dev = dst->dev,
2891 .gw = &rt6->rt6i_gateway,
2892 };
2893
2894 nexthop_for_each_fib6_nh(res.f6i->nh,
2895 fib6_nh_find_match, &arg);
2896
2897
2898
2899
2900 if (!arg.match)
2901 goto out_unlock;
2902
2903 res.nh = arg.match;
2904 } else {
2905 res.nh = res.f6i->fib6_nh;
2906 }
2907
2908 nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
2909 if (nrt6) {
2910 rt6_do_update_pmtu(nrt6, mtu);
2911 if (rt6_insert_exception(nrt6, &res))
2912 dst_release_immediate(&nrt6->dst);
2913 }
2914out_unlock:
2915 rcu_read_unlock();
2916 }
2917}
2918
2919static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
2920 struct sk_buff *skb, u32 mtu,
2921 bool confirm_neigh)
2922{
2923 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu,
2924 confirm_neigh);
2925}
2926
2927void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
2928 int oif, u32 mark, kuid_t uid)
2929{
2930 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2931 struct dst_entry *dst;
2932 struct flowi6 fl6 = {
2933 .flowi6_oif = oif,
2934 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2935 .daddr = iph->daddr,
2936 .saddr = iph->saddr,
2937 .flowlabel = ip6_flowinfo(iph),
2938 .flowi6_uid = uid,
2939 };
2940
2941 dst = ip6_route_output(net, NULL, &fl6);
2942 if (!dst->error)
2943 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu), true);
2944 dst_release(dst);
2945}
2946EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2947
2948void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2949{
2950 int oif = sk->sk_bound_dev_if;
2951 struct dst_entry *dst;
2952
2953 if (!oif && skb->dev)
2954 oif = l3mdev_master_ifindex(skb->dev);
2955
2956 ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
2957
2958 dst = __sk_dst_get(sk);
2959 if (!dst || !dst->obsolete ||
2960 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2961 return;
2962
2963 bh_lock_sock(sk);
2964 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2965 ip6_datagram_dst_update(sk, false);
2966 bh_unlock_sock(sk);
2967}
2968EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2969
2970void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2971 const struct flowi6 *fl6)
2972{
2973#ifdef CONFIG_IPV6_SUBTREES
2974 struct ipv6_pinfo *np = inet6_sk(sk);
2975#endif
2976
2977 ip6_dst_store(sk, dst,
2978 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2979 &sk->sk_v6_daddr : NULL,
2980#ifdef CONFIG_IPV6_SUBTREES
2981 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2982 &np->saddr :
2983#endif
2984 NULL);
2985}
2986
2987static bool ip6_redirect_nh_match(const struct fib6_result *res,
2988 struct flowi6 *fl6,
2989 const struct in6_addr *gw,
2990 struct rt6_info **ret)
2991{
2992 const struct fib6_nh *nh = res->nh;
2993
2994 if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
2995 fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
2996 return false;
2997
2998
2999
3000
3001
3002
3003 if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
3004 struct rt6_info *rt_cache;
3005
3006 rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
3007 if (rt_cache &&
3008 ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
3009 *ret = rt_cache;
3010 return true;
3011 }
3012 return false;
3013 }
3014 return true;
3015}
3016
3017struct fib6_nh_rd_arg {
3018 struct fib6_result *res;
3019 struct flowi6 *fl6;
3020 const struct in6_addr *gw;
3021 struct rt6_info **ret;
3022};
3023
3024static int fib6_nh_redirect_match(struct fib6_nh *nh, void *_arg)
3025{
3026 struct fib6_nh_rd_arg *arg = _arg;
3027
3028 arg->res->nh = nh;
3029 return ip6_redirect_nh_match(arg->res, arg->fl6, arg->gw, arg->ret);
3030}
3031
3032
3033struct ip6rd_flowi {
3034 struct flowi6 fl6;
3035 struct in6_addr gateway;
3036};
3037
3038INDIRECT_CALLABLE_SCOPE struct rt6_info *__ip6_route_redirect(struct net *net,
3039 struct fib6_table *table,
3040 struct flowi6 *fl6,
3041 const struct sk_buff *skb,
3042 int flags)
3043{
3044 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
3045 struct rt6_info *ret = NULL;
3046 struct fib6_result res = {};
3047 struct fib6_nh_rd_arg arg = {
3048 .res = &res,
3049 .fl6 = fl6,
3050 .gw = &rdfl->gateway,
3051 .ret = &ret
3052 };
3053 struct fib6_info *rt;
3054 struct fib6_node *fn;
3055
3056
3057
3058
3059 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
3060 fl6->flowi6_oif = skb->dev->ifindex;
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072 rcu_read_lock();
3073 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
3074restart:
3075 for_each_fib6_node_rt_rcu(fn) {
3076 res.f6i = rt;
3077 if (fib6_check_expired(rt))
3078 continue;
3079 if (rt->fib6_flags & RTF_REJECT)
3080 break;
3081 if (unlikely(rt->nh)) {
3082 if (nexthop_is_blackhole(rt->nh))
3083 continue;
3084
3085 if (nexthop_for_each_fib6_nh(rt->nh,
3086 fib6_nh_redirect_match,
3087 &arg))
3088 goto out;
3089 } else {
3090 res.nh = rt->fib6_nh;
3091 if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway,
3092 &ret))
3093 goto out;
3094 }
3095 }
3096
3097 if (!rt)
3098 rt = net->ipv6.fib6_null_entry;
3099 else if (rt->fib6_flags & RTF_REJECT) {
3100 ret = net->ipv6.ip6_null_entry;
3101 goto out;
3102 }
3103
3104 if (rt == net->ipv6.fib6_null_entry) {
3105 fn = fib6_backtrack(fn, &fl6->saddr);
3106 if (fn)
3107 goto restart;
3108 }
3109
3110 res.f6i = rt;
3111 res.nh = rt->fib6_nh;
3112out:
3113 if (ret) {
3114 ip6_hold_safe(net, &ret);
3115 } else {
3116 res.fib6_flags = res.f6i->fib6_flags;
3117 res.fib6_type = res.f6i->fib6_type;
3118 ret = ip6_create_rt_rcu(&res);
3119 }
3120
3121 rcu_read_unlock();
3122
3123 trace_fib6_table_lookup(net, &res, table, fl6);
3124 return ret;
3125};
3126
3127static struct dst_entry *ip6_route_redirect(struct net *net,
3128 const struct flowi6 *fl6,
3129 const struct sk_buff *skb,
3130 const struct in6_addr *gateway)
3131{
3132 int flags = RT6_LOOKUP_F_HAS_SADDR;
3133 struct ip6rd_flowi rdfl;
3134
3135 rdfl.fl6 = *fl6;
3136 rdfl.gateway = *gateway;
3137
3138 return fib6_rule_lookup(net, &rdfl.fl6, skb,
3139 flags, __ip6_route_redirect);
3140}
3141
3142void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
3143 kuid_t uid)
3144{
3145 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
3146 struct dst_entry *dst;
3147 struct flowi6 fl6 = {
3148 .flowi6_iif = LOOPBACK_IFINDEX,
3149 .flowi6_oif = oif,
3150 .flowi6_mark = mark,
3151 .daddr = iph->daddr,
3152 .saddr = iph->saddr,
3153 .flowlabel = ip6_flowinfo(iph),
3154 .flowi6_uid = uid,
3155 };
3156
3157 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
3158 rt6_do_redirect(dst, NULL, skb);
3159 dst_release(dst);
3160}
3161EXPORT_SYMBOL_GPL(ip6_redirect);
3162
3163void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
3164{
3165 const struct ipv6hdr *iph = ipv6_hdr(skb);
3166 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
3167 struct dst_entry *dst;
3168 struct flowi6 fl6 = {
3169 .flowi6_iif = LOOPBACK_IFINDEX,
3170 .flowi6_oif = oif,
3171 .daddr = msg->dest,
3172 .saddr = iph->daddr,
3173 .flowi6_uid = sock_net_uid(net, NULL),
3174 };
3175
3176 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
3177 rt6_do_redirect(dst, NULL, skb);
3178 dst_release(dst);
3179}
3180
3181void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
3182{
3183 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
3184 sk->sk_uid);
3185}
3186EXPORT_SYMBOL_GPL(ip6_sk_redirect);
3187
3188static unsigned int ip6_default_advmss(const struct dst_entry *dst)
3189{
3190 struct net_device *dev = dst->dev;
3191 unsigned int mtu = dst_mtu(dst);
3192 struct net *net = dev_net(dev);
3193
3194 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
3195
3196 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
3197 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
3198
3199
3200
3201
3202
3203
3204
3205 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
3206 mtu = IPV6_MAXPLEN;
3207 return mtu;
3208}
3209
3210INDIRECT_CALLABLE_SCOPE unsigned int ip6_mtu(const struct dst_entry *dst)
3211{
3212 struct inet6_dev *idev;
3213 unsigned int mtu;
3214
3215 mtu = dst_metric_raw(dst, RTAX_MTU);
3216 if (mtu)
3217 goto out;
3218
3219 mtu = IPV6_MIN_MTU;
3220
3221 rcu_read_lock();
3222 idev = __in6_dev_get(dst->dev);
3223 if (idev)
3224 mtu = idev->cnf.mtu6;
3225 rcu_read_unlock();
3226
3227out:
3228 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3229
3230 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
3231}
3232EXPORT_INDIRECT_CALLABLE(ip6_mtu);
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242u32 ip6_mtu_from_fib6(const struct fib6_result *res,
3243 const struct in6_addr *daddr,
3244 const struct in6_addr *saddr)
3245{
3246 const struct fib6_nh *nh = res->nh;
3247 struct fib6_info *f6i = res->f6i;
3248 struct inet6_dev *idev;
3249 struct rt6_info *rt;
3250 u32 mtu = 0;
3251
3252 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
3253 mtu = f6i->fib6_pmtu;
3254 if (mtu)
3255 goto out;
3256 }
3257
3258 rt = rt6_find_cached_rt(res, daddr, saddr);
3259 if (unlikely(rt)) {
3260 mtu = dst_metric_raw(&rt->dst, RTAX_MTU);
3261 } else {
3262 struct net_device *dev = nh->fib_nh_dev;
3263
3264 mtu = IPV6_MIN_MTU;
3265 idev = __in6_dev_get(dev);
3266 if (idev && idev->cnf.mtu6 > mtu)
3267 mtu = idev->cnf.mtu6;
3268 }
3269
3270 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
3271out:
3272 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
3273}
3274
3275struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
3276 struct flowi6 *fl6)
3277{
3278 struct dst_entry *dst;
3279 struct rt6_info *rt;
3280 struct inet6_dev *idev = in6_dev_get(dev);
3281 struct net *net = dev_net(dev);
3282
3283 if (unlikely(!idev))
3284 return ERR_PTR(-ENODEV);
3285
3286 rt = ip6_dst_alloc(net, dev, 0);
3287 if (unlikely(!rt)) {
3288 in6_dev_put(idev);
3289 dst = ERR_PTR(-ENOMEM);
3290 goto out;
3291 }
3292
3293 rt->dst.input = ip6_input;
3294 rt->dst.output = ip6_output;
3295 rt->rt6i_gateway = fl6->daddr;
3296 rt->rt6i_dst.addr = fl6->daddr;
3297 rt->rt6i_dst.plen = 128;
3298 rt->rt6i_idev = idev;
3299 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
3300
3301
3302
3303
3304 rt6_uncached_list_add(rt);
3305 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
3306
3307 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
3308
3309out:
3310 return dst;
3311}
3312
3313static int ip6_dst_gc(struct dst_ops *ops)
3314{
3315 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
3316 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
3317 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
3318 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
3319 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
3320 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
3321 int entries;
3322
3323 entries = dst_entries_get_fast(ops);
3324 if (entries > rt_max_size)
3325 entries = dst_entries_get_slow(ops);
3326
3327 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
3328 entries <= rt_max_size)
3329 goto out;
3330
3331 net->ipv6.ip6_rt_gc_expire++;
3332 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
3333 entries = dst_entries_get_slow(ops);
3334 if (entries < ops->gc_thresh)
3335 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
3336out:
3337 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
3338 return entries > rt_max_size;
3339}
3340
3341static int ip6_nh_lookup_table(struct net *net, struct fib6_config *cfg,
3342 const struct in6_addr *gw_addr, u32 tbid,
3343 int flags, struct fib6_result *res)
3344{
3345 struct flowi6 fl6 = {
3346 .flowi6_oif = cfg->fc_ifindex,
3347 .daddr = *gw_addr,
3348 .saddr = cfg->fc_prefsrc,
3349 };
3350 struct fib6_table *table;
3351 int err;
3352
3353 table = fib6_get_table(net, tbid);
3354 if (!table)
3355 return -EINVAL;
3356
3357 if (!ipv6_addr_any(&cfg->fc_prefsrc))
3358 flags |= RT6_LOOKUP_F_HAS_SADDR;
3359
3360 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
3361
3362 err = fib6_table_lookup(net, table, cfg->fc_ifindex, &fl6, res, flags);
3363 if (!err && res->f6i != net->ipv6.fib6_null_entry)
3364 fib6_select_path(net, res, &fl6, cfg->fc_ifindex,
3365 cfg->fc_ifindex != 0, NULL, flags);
3366
3367 return err;
3368}
3369
3370static int ip6_route_check_nh_onlink(struct net *net,
3371 struct fib6_config *cfg,
3372 const struct net_device *dev,
3373 struct netlink_ext_ack *extack)
3374{
3375 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
3376 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3377 struct fib6_result res = {};
3378 int err;
3379
3380 err = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0, &res);
3381 if (!err && !(res.fib6_flags & RTF_REJECT) &&
3382
3383 !ipv6_addr_any(&res.f6i->fib6_dst.addr) &&
3384 (res.fib6_type != RTN_UNICAST || dev != res.nh->fib_nh_dev)) {
3385 NL_SET_ERR_MSG(extack,
3386 "Nexthop has invalid gateway or device mismatch");
3387 err = -EINVAL;
3388 }
3389
3390 return err;
3391}
3392
3393static int ip6_route_check_nh(struct net *net,
3394 struct fib6_config *cfg,
3395 struct net_device **_dev,
3396 struct inet6_dev **idev)
3397{
3398 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3399 struct net_device *dev = _dev ? *_dev : NULL;
3400 int flags = RT6_LOOKUP_F_IFACE;
3401 struct fib6_result res = {};
3402 int err = -EHOSTUNREACH;
3403
3404 if (cfg->fc_table) {
3405 err = ip6_nh_lookup_table(net, cfg, gw_addr,
3406 cfg->fc_table, flags, &res);
3407
3408
3409
3410 if (err || res.fib6_flags & RTF_REJECT ||
3411 res.nh->fib_nh_gw_family ||
3412 (dev && dev != res.nh->fib_nh_dev))
3413 err = -EHOSTUNREACH;
3414 }
3415
3416 if (err < 0) {
3417 struct flowi6 fl6 = {
3418 .flowi6_oif = cfg->fc_ifindex,
3419 .daddr = *gw_addr,
3420 };
3421
3422 err = fib6_lookup(net, cfg->fc_ifindex, &fl6, &res, flags);
3423 if (err || res.fib6_flags & RTF_REJECT ||
3424 res.nh->fib_nh_gw_family)
3425 err = -EHOSTUNREACH;
3426
3427 if (err)
3428 return err;
3429
3430 fib6_select_path(net, &res, &fl6, cfg->fc_ifindex,
3431 cfg->fc_ifindex != 0, NULL, flags);
3432 }
3433
3434 err = 0;
3435 if (dev) {
3436 if (dev != res.nh->fib_nh_dev)
3437 err = -EHOSTUNREACH;
3438 } else {
3439 *_dev = dev = res.nh->fib_nh_dev;
3440 dev_hold(dev);
3441 *idev = in6_dev_get(dev);
3442 }
3443
3444 return err;
3445}
3446
3447static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
3448 struct net_device **_dev, struct inet6_dev **idev,
3449 struct netlink_ext_ack *extack)
3450{
3451 const struct in6_addr *gw_addr = &cfg->fc_gateway;
3452 int gwa_type = ipv6_addr_type(gw_addr);
3453 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
3454 const struct net_device *dev = *_dev;
3455 bool need_addr_check = !dev;
3456 int err = -EINVAL;
3457
3458
3459
3460
3461
3462
3463 if (dev &&
3464 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3465 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3466 goto out;
3467 }
3468
3469 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
3480 NL_SET_ERR_MSG(extack, "Invalid gateway address");
3481 goto out;
3482 }
3483
3484 rcu_read_lock();
3485
3486 if (cfg->fc_flags & RTNH_F_ONLINK)
3487 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
3488 else
3489 err = ip6_route_check_nh(net, cfg, _dev, idev);
3490
3491 rcu_read_unlock();
3492
3493 if (err)
3494 goto out;
3495 }
3496
3497
3498 dev = *_dev;
3499
3500 err = -EINVAL;
3501 if (!dev) {
3502 NL_SET_ERR_MSG(extack, "Egress device not specified");
3503 goto out;
3504 } else if (dev->flags & IFF_LOOPBACK) {
3505 NL_SET_ERR_MSG(extack,
3506 "Egress device can not be loopback device for this route");
3507 goto out;
3508 }
3509
3510
3511
3512
3513 if (need_addr_check &&
3514 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
3515 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
3516 goto out;
3517 }
3518
3519 err = 0;
3520out:
3521 return err;
3522}
3523
3524static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
3525{
3526 if ((flags & RTF_REJECT) ||
3527 (dev && (dev->flags & IFF_LOOPBACK) &&
3528 !(addr_type & IPV6_ADDR_LOOPBACK) &&
3529 !(flags & (RTF_ANYCAST | RTF_LOCAL))))
3530 return true;
3531
3532 return false;
3533}
3534
3535int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
3536 struct fib6_config *cfg, gfp_t gfp_flags,
3537 struct netlink_ext_ack *extack)
3538{
3539 struct net_device *dev = NULL;
3540 struct inet6_dev *idev = NULL;
3541 int addr_type;
3542 int err;
3543
3544 fib6_nh->fib_nh_family = AF_INET6;
3545#ifdef CONFIG_IPV6_ROUTER_PREF
3546 fib6_nh->last_probe = jiffies;
3547#endif
3548 if (cfg->fc_is_fdb) {
3549 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3550 fib6_nh->fib_nh_gw_family = AF_INET6;
3551 return 0;
3552 }
3553
3554 err = -ENODEV;
3555 if (cfg->fc_ifindex) {
3556 dev = dev_get_by_index(net, cfg->fc_ifindex);
3557 if (!dev)
3558 goto out;
3559 idev = in6_dev_get(dev);
3560 if (!idev)
3561 goto out;
3562 }
3563
3564 if (cfg->fc_flags & RTNH_F_ONLINK) {
3565 if (!dev) {
3566 NL_SET_ERR_MSG(extack,
3567 "Nexthop device required for onlink");
3568 goto out;
3569 }
3570
3571 if (!(dev->flags & IFF_UP)) {
3572 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3573 err = -ENETDOWN;
3574 goto out;
3575 }
3576
3577 fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
3578 }
3579
3580 fib6_nh->fib_nh_weight = 1;
3581
3582
3583
3584
3585 addr_type = ipv6_addr_type(&cfg->fc_dst);
3586 if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
3587
3588 if (dev != net->loopback_dev) {
3589 if (dev) {
3590 dev_put(dev);
3591 in6_dev_put(idev);
3592 }
3593 dev = net->loopback_dev;
3594 dev_hold(dev);
3595 idev = in6_dev_get(dev);
3596 if (!idev) {
3597 err = -ENODEV;
3598 goto out;
3599 }
3600 }
3601 goto pcpu_alloc;
3602 }
3603
3604 if (cfg->fc_flags & RTF_GATEWAY) {
3605 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3606 if (err)
3607 goto out;
3608
3609 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3610 fib6_nh->fib_nh_gw_family = AF_INET6;
3611 }
3612
3613 err = -ENODEV;
3614 if (!dev)
3615 goto out;
3616
3617 if (idev->cnf.disable_ipv6) {
3618 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3619 err = -EACCES;
3620 goto out;
3621 }
3622
3623 if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
3624 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3625 err = -ENETDOWN;
3626 goto out;
3627 }
3628
3629 if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
3630 !netif_carrier_ok(dev))
3631 fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
3632
3633 err = fib_nh_common_init(net, &fib6_nh->nh_common, cfg->fc_encap,
3634 cfg->fc_encap_type, cfg, gfp_flags, extack);
3635 if (err)
3636 goto out;
3637
3638pcpu_alloc:
3639 fib6_nh->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
3640 if (!fib6_nh->rt6i_pcpu) {
3641 err = -ENOMEM;
3642 goto out;
3643 }
3644
3645 fib6_nh->fib_nh_dev = dev;
3646 fib6_nh->fib_nh_oif = dev->ifindex;
3647 err = 0;
3648out:
3649 if (idev)
3650 in6_dev_put(idev);
3651
3652 if (err) {
3653 lwtstate_put(fib6_nh->fib_nh_lws);
3654 fib6_nh->fib_nh_lws = NULL;
3655 if (dev)
3656 dev_put(dev);
3657 }
3658
3659 return err;
3660}
3661
3662void fib6_nh_release(struct fib6_nh *fib6_nh)
3663{
3664 struct rt6_exception_bucket *bucket;
3665
3666 rcu_read_lock();
3667
3668 fib6_nh_flush_exceptions(fib6_nh, NULL);
3669 bucket = fib6_nh_get_excptn_bucket(fib6_nh, NULL);
3670 if (bucket) {
3671 rcu_assign_pointer(fib6_nh->rt6i_exception_bucket, NULL);
3672 kfree(bucket);
3673 }
3674
3675 rcu_read_unlock();
3676
3677 if (fib6_nh->rt6i_pcpu) {
3678 int cpu;
3679
3680 for_each_possible_cpu(cpu) {
3681 struct rt6_info **ppcpu_rt;
3682 struct rt6_info *pcpu_rt;
3683
3684 ppcpu_rt = per_cpu_ptr(fib6_nh->rt6i_pcpu, cpu);
3685 pcpu_rt = *ppcpu_rt;
3686 if (pcpu_rt) {
3687 dst_dev_put(&pcpu_rt->dst);
3688 dst_release(&pcpu_rt->dst);
3689 *ppcpu_rt = NULL;
3690 }
3691 }
3692
3693 free_percpu(fib6_nh->rt6i_pcpu);
3694 }
3695
3696 fib_nh_common_release(&fib6_nh->nh_common);
3697}
3698
3699static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
3700 gfp_t gfp_flags,
3701 struct netlink_ext_ack *extack)
3702{
3703 struct net *net = cfg->fc_nlinfo.nl_net;
3704 struct fib6_info *rt = NULL;
3705 struct nexthop *nh = NULL;
3706 struct fib6_table *table;
3707 struct fib6_nh *fib6_nh;
3708 int err = -EINVAL;
3709 int addr_type;
3710
3711
3712 if (cfg->fc_flags & RTF_PCPU) {
3713 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
3714 goto out;
3715 }
3716
3717
3718 if (cfg->fc_flags & RTF_CACHE) {
3719 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
3720 goto out;
3721 }
3722
3723 if (cfg->fc_type > RTN_MAX) {
3724 NL_SET_ERR_MSG(extack, "Invalid route type");
3725 goto out;
3726 }
3727
3728 if (cfg->fc_dst_len > 128) {
3729 NL_SET_ERR_MSG(extack, "Invalid prefix length");
3730 goto out;
3731 }
3732 if (cfg->fc_src_len > 128) {
3733 NL_SET_ERR_MSG(extack, "Invalid source address length");
3734 goto out;
3735 }
3736#ifndef CONFIG_IPV6_SUBTREES
3737 if (cfg->fc_src_len) {
3738 NL_SET_ERR_MSG(extack,
3739 "Specifying source address requires IPV6_SUBTREES to be enabled");
3740 goto out;
3741 }
3742#endif
3743 if (cfg->fc_nh_id) {
3744 nh = nexthop_find_by_id(net, cfg->fc_nh_id);
3745 if (!nh) {
3746 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
3747 goto out;
3748 }
3749 err = fib6_check_nexthop(nh, cfg, extack);
3750 if (err)
3751 goto out;
3752 }
3753
3754 err = -ENOBUFS;
3755 if (cfg->fc_nlinfo.nlh &&
3756 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
3757 table = fib6_get_table(net, cfg->fc_table);
3758 if (!table) {
3759 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
3760 table = fib6_new_table(net, cfg->fc_table);
3761 }
3762 } else {
3763 table = fib6_new_table(net, cfg->fc_table);
3764 }
3765
3766 if (!table)
3767 goto out;
3768
3769 err = -ENOMEM;
3770 rt = fib6_info_alloc(gfp_flags, !nh);
3771 if (!rt)
3772 goto out;
3773
3774 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
3775 extack);
3776 if (IS_ERR(rt->fib6_metrics)) {
3777 err = PTR_ERR(rt->fib6_metrics);
3778
3779 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
3780 goto out_free;
3781 }
3782
3783 if (cfg->fc_flags & RTF_ADDRCONF)
3784 rt->dst_nocount = true;
3785
3786 if (cfg->fc_flags & RTF_EXPIRES)
3787 fib6_set_expires(rt, jiffies +
3788 clock_t_to_jiffies(cfg->fc_expires));
3789 else
3790 fib6_clean_expires(rt);
3791
3792 if (cfg->fc_protocol == RTPROT_UNSPEC)
3793 cfg->fc_protocol = RTPROT_BOOT;
3794 rt->fib6_protocol = cfg->fc_protocol;
3795
3796 rt->fib6_table = table;
3797 rt->fib6_metric = cfg->fc_metric;
3798 rt->fib6_type = cfg->fc_type ? : RTN_UNICAST;
3799 rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
3800
3801 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3802 rt->fib6_dst.plen = cfg->fc_dst_len;
3803
3804#ifdef CONFIG_IPV6_SUBTREES
3805 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3806 rt->fib6_src.plen = cfg->fc_src_len;
3807#endif
3808 if (nh) {
3809 if (rt->fib6_src.plen) {
3810 NL_SET_ERR_MSG(extack, "Nexthops can not be used with source routing");
3811 goto out_free;
3812 }
3813 if (!nexthop_get(nh)) {
3814 NL_SET_ERR_MSG(extack, "Nexthop has been deleted");
3815 goto out_free;
3816 }
3817 rt->nh = nh;
3818 fib6_nh = nexthop_fib6_nh(rt->nh);
3819 } else {
3820 err = fib6_nh_init(net, rt->fib6_nh, cfg, gfp_flags, extack);
3821 if (err)
3822 goto out;
3823
3824 fib6_nh = rt->fib6_nh;
3825
3826
3827
3828
3829 addr_type = ipv6_addr_type(&cfg->fc_dst);
3830 if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh->fib_nh_dev,
3831 addr_type))
3832 rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
3833 }
3834
3835 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
3836 struct net_device *dev = fib6_nh->fib_nh_dev;
3837
3838 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
3839 NL_SET_ERR_MSG(extack, "Invalid source address");
3840 err = -EINVAL;
3841 goto out;
3842 }
3843 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3844 rt->fib6_prefsrc.plen = 128;
3845 } else
3846 rt->fib6_prefsrc.plen = 0;
3847
3848 return rt;
3849out:
3850 fib6_info_release(rt);
3851 return ERR_PTR(err);
3852out_free:
3853 ip_fib_metrics_put(rt->fib6_metrics);
3854 kfree(rt);
3855 return ERR_PTR(err);
3856}
3857
3858int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
3859 struct netlink_ext_ack *extack)
3860{
3861 struct fib6_info *rt;
3862 int err;
3863
3864 rt = ip6_route_info_create(cfg, gfp_flags, extack);
3865 if (IS_ERR(rt))
3866 return PTR_ERR(rt);
3867
3868 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
3869 fib6_info_release(rt);
3870
3871 return err;
3872}
3873
3874static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
3875{
3876 struct net *net = info->nl_net;
3877 struct fib6_table *table;
3878 int err;
3879
3880 if (rt == net->ipv6.fib6_null_entry) {
3881 err = -ENOENT;
3882 goto out;
3883 }
3884
3885 table = rt->fib6_table;
3886 spin_lock_bh(&table->tb6_lock);
3887 err = fib6_del(rt, info);
3888 spin_unlock_bh(&table->tb6_lock);
3889
3890out:
3891 fib6_info_release(rt);
3892 return err;
3893}
3894
3895int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify)
3896{
3897 struct nl_info info = {
3898 .nl_net = net,
3899 .skip_notify = skip_notify
3900 };
3901
3902 return __ip6_del_rt(rt, &info);
3903}
3904
3905static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
3906{
3907 struct nl_info *info = &cfg->fc_nlinfo;
3908 struct net *net = info->nl_net;
3909 struct sk_buff *skb = NULL;
3910 struct fib6_table *table;
3911 int err = -ENOENT;
3912
3913 if (rt == net->ipv6.fib6_null_entry)
3914 goto out_put;
3915 table = rt->fib6_table;
3916 spin_lock_bh(&table->tb6_lock);
3917
3918 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
3919 struct fib6_info *sibling, *next_sibling;
3920 struct fib6_node *fn;
3921
3922
3923 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3924 if (skb) {
3925 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3926
3927 if (rt6_fill_node(net, skb, rt, NULL,
3928 NULL, NULL, 0, RTM_DELROUTE,
3929 info->portid, seq, 0) < 0) {
3930 kfree_skb(skb);
3931 skb = NULL;
3932 } else
3933 info->skip_notify = 1;
3934 }
3935
3936
3937
3938
3939
3940
3941 info->skip_notify_kernel = 1;
3942 fn = rcu_dereference_protected(rt->fib6_node,
3943 lockdep_is_held(&table->tb6_lock));
3944 if (rcu_access_pointer(fn->leaf) == rt) {
3945 struct fib6_info *last_sibling, *replace_rt;
3946
3947 last_sibling = list_last_entry(&rt->fib6_siblings,
3948 struct fib6_info,
3949 fib6_siblings);
3950 replace_rt = rcu_dereference_protected(
3951 last_sibling->fib6_next,
3952 lockdep_is_held(&table->tb6_lock));
3953 if (replace_rt)
3954 call_fib6_entry_notifiers_replace(net,
3955 replace_rt);
3956 else
3957 call_fib6_multipath_entry_notifiers(net,
3958 FIB_EVENT_ENTRY_DEL,
3959 rt, rt->fib6_nsiblings,
3960 NULL);
3961 }
3962 list_for_each_entry_safe(sibling, next_sibling,
3963 &rt->fib6_siblings,
3964 fib6_siblings) {
3965 err = fib6_del(sibling, info);
3966 if (err)
3967 goto out_unlock;
3968 }
3969 }
3970
3971 err = fib6_del(rt, info);
3972out_unlock:
3973 spin_unlock_bh(&table->tb6_lock);
3974out_put:
3975 fib6_info_release(rt);
3976
3977 if (skb) {
3978 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3979 info->nlh, gfp_any());
3980 }
3981 return err;
3982}
3983
3984static int __ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
3985{
3986 int rc = -ESRCH;
3987
3988 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3989 goto out;
3990
3991 if (cfg->fc_flags & RTF_GATEWAY &&
3992 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3993 goto out;
3994
3995 rc = rt6_remove_exception_rt(rt);
3996out:
3997 return rc;
3998}
3999
4000static int ip6_del_cached_rt(struct fib6_config *cfg, struct fib6_info *rt,
4001 struct fib6_nh *nh)
4002{
4003 struct fib6_result res = {
4004 .f6i = rt,
4005 .nh = nh,
4006 };
4007 struct rt6_info *rt_cache;
4008
4009 rt_cache = rt6_find_cached_rt(&res, &cfg->fc_dst, &cfg->fc_src);
4010 if (rt_cache)
4011 return __ip6_del_cached_rt(rt_cache, cfg);
4012
4013 return 0;
4014}
4015
4016struct fib6_nh_del_cached_rt_arg {
4017 struct fib6_config *cfg;
4018 struct fib6_info *f6i;
4019};
4020
4021static int fib6_nh_del_cached_rt(struct fib6_nh *nh, void *_arg)
4022{
4023 struct fib6_nh_del_cached_rt_arg *arg = _arg;
4024 int rc;
4025
4026 rc = ip6_del_cached_rt(arg->cfg, arg->f6i, nh);
4027 return rc != -ESRCH ? rc : 0;
4028}
4029
4030static int ip6_del_cached_rt_nh(struct fib6_config *cfg, struct fib6_info *f6i)
4031{
4032 struct fib6_nh_del_cached_rt_arg arg = {
4033 .cfg = cfg,
4034 .f6i = f6i
4035 };
4036
4037 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_del_cached_rt, &arg);
4038}
4039
4040static int ip6_route_del(struct fib6_config *cfg,
4041 struct netlink_ext_ack *extack)
4042{
4043 struct fib6_table *table;
4044 struct fib6_info *rt;
4045 struct fib6_node *fn;
4046 int err = -ESRCH;
4047
4048 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
4049 if (!table) {
4050 NL_SET_ERR_MSG(extack, "FIB table does not exist");
4051 return err;
4052 }
4053
4054 rcu_read_lock();
4055
4056 fn = fib6_locate(&table->tb6_root,
4057 &cfg->fc_dst, cfg->fc_dst_len,
4058 &cfg->fc_src, cfg->fc_src_len,
4059 !(cfg->fc_flags & RTF_CACHE));
4060
4061 if (fn) {
4062 for_each_fib6_node_rt_rcu(fn) {
4063 struct fib6_nh *nh;
4064
4065 if (rt->nh && cfg->fc_nh_id &&
4066 rt->nh->id != cfg->fc_nh_id)
4067 continue;
4068
4069 if (cfg->fc_flags & RTF_CACHE) {
4070 int rc = 0;
4071
4072 if (rt->nh) {
4073 rc = ip6_del_cached_rt_nh(cfg, rt);
4074 } else if (cfg->fc_nh_id) {
4075 continue;
4076 } else {
4077 nh = rt->fib6_nh;
4078 rc = ip6_del_cached_rt(cfg, rt, nh);
4079 }
4080 if (rc != -ESRCH) {
4081 rcu_read_unlock();
4082 return rc;
4083 }
4084 continue;
4085 }
4086
4087 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
4088 continue;
4089 if (cfg->fc_protocol &&
4090 cfg->fc_protocol != rt->fib6_protocol)
4091 continue;
4092
4093 if (rt->nh) {
4094 if (!fib6_info_hold_safe(rt))
4095 continue;
4096 rcu_read_unlock();
4097
4098 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
4099 }
4100 if (cfg->fc_nh_id)
4101 continue;
4102
4103 nh = rt->fib6_nh;
4104 if (cfg->fc_ifindex &&
4105 (!nh->fib_nh_dev ||
4106 nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
4107 continue;
4108 if (cfg->fc_flags & RTF_GATEWAY &&
4109 !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
4110 continue;
4111 if (!fib6_info_hold_safe(rt))
4112 continue;
4113 rcu_read_unlock();
4114
4115
4116 if (cfg->fc_flags & RTF_GATEWAY)
4117 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
4118
4119 return __ip6_del_rt_siblings(rt, cfg);
4120 }
4121 }
4122 rcu_read_unlock();
4123
4124 return err;
4125}
4126
4127static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
4128{
4129 struct netevent_redirect netevent;
4130 struct rt6_info *rt, *nrt = NULL;
4131 struct fib6_result res = {};
4132 struct ndisc_options ndopts;
4133 struct inet6_dev *in6_dev;
4134 struct neighbour *neigh;
4135 struct rd_msg *msg;
4136 int optlen, on_link;
4137 u8 *lladdr;
4138
4139 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
4140 optlen -= sizeof(*msg);
4141
4142 if (optlen < 0) {
4143 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
4144 return;
4145 }
4146
4147 msg = (struct rd_msg *)icmp6_hdr(skb);
4148
4149 if (ipv6_addr_is_multicast(&msg->dest)) {
4150 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
4151 return;
4152 }
4153
4154 on_link = 0;
4155 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
4156 on_link = 1;
4157 } else if (ipv6_addr_type(&msg->target) !=
4158 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
4159 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
4160 return;
4161 }
4162
4163 in6_dev = __in6_dev_get(skb->dev);
4164 if (!in6_dev)
4165 return;
4166 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
4167 return;
4168
4169
4170
4171
4172
4173
4174 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
4175 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
4176 return;
4177 }
4178
4179 lladdr = NULL;
4180 if (ndopts.nd_opts_tgt_lladdr) {
4181 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
4182 skb->dev);
4183 if (!lladdr) {
4184 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
4185 return;
4186 }
4187 }
4188
4189 rt = (struct rt6_info *) dst;
4190 if (rt->rt6i_flags & RTF_REJECT) {
4191 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
4192 return;
4193 }
4194
4195
4196
4197
4198
4199 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
4200
4201 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
4202 if (!neigh)
4203 return;
4204
4205
4206
4207
4208
4209 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
4210 NEIGH_UPDATE_F_WEAK_OVERRIDE|
4211 NEIGH_UPDATE_F_OVERRIDE|
4212 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
4213 NEIGH_UPDATE_F_ISROUTER)),
4214 NDISC_REDIRECT, &ndopts);
4215
4216 rcu_read_lock();
4217 res.f6i = rcu_dereference(rt->from);
4218 if (!res.f6i)
4219 goto out;
4220
4221 if (res.f6i->nh) {
4222 struct fib6_nh_match_arg arg = {
4223 .dev = dst->dev,
4224 .gw = &rt->rt6i_gateway,
4225 };
4226
4227 nexthop_for_each_fib6_nh(res.f6i->nh,
4228 fib6_nh_find_match, &arg);
4229
4230
4231
4232
4233 if (!arg.match)
4234 goto out;
4235 res.nh = arg.match;
4236 } else {
4237 res.nh = res.f6i->fib6_nh;
4238 }
4239
4240 res.fib6_flags = res.f6i->fib6_flags;
4241 res.fib6_type = res.f6i->fib6_type;
4242 nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
4243 if (!nrt)
4244 goto out;
4245
4246 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
4247 if (on_link)
4248 nrt->rt6i_flags &= ~RTF_GATEWAY;
4249
4250 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
4251
4252
4253 if (rt6_insert_exception(nrt, &res)) {
4254 dst_release_immediate(&nrt->dst);
4255 goto out;
4256 }
4257
4258 netevent.old = &rt->dst;
4259 netevent.new = &nrt->dst;
4260 netevent.daddr = &msg->dest;
4261 netevent.neigh = neigh;
4262 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
4263
4264out:
4265 rcu_read_unlock();
4266 neigh_release(neigh);
4267}
4268
4269#ifdef CONFIG_IPV6_ROUTE_INFO
4270static struct fib6_info *rt6_get_route_info(struct net *net,
4271 const struct in6_addr *prefix, int prefixlen,
4272 const struct in6_addr *gwaddr,
4273 struct net_device *dev)
4274{
4275 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4276 int ifindex = dev->ifindex;
4277 struct fib6_node *fn;
4278 struct fib6_info *rt = NULL;
4279 struct fib6_table *table;
4280
4281 table = fib6_get_table(net, tb_id);
4282 if (!table)
4283 return NULL;
4284
4285 rcu_read_lock();
4286 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
4287 if (!fn)
4288 goto out;
4289
4290 for_each_fib6_node_rt_rcu(fn) {
4291
4292 if (rt->nh)
4293 continue;
4294 if (rt->fib6_nh->fib_nh_dev->ifindex != ifindex)
4295 continue;
4296 if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
4297 !rt->fib6_nh->fib_nh_gw_family)
4298 continue;
4299 if (!ipv6_addr_equal(&rt->fib6_nh->fib_nh_gw6, gwaddr))
4300 continue;
4301 if (!fib6_info_hold_safe(rt))
4302 continue;
4303 break;
4304 }
4305out:
4306 rcu_read_unlock();
4307 return rt;
4308}
4309
4310static struct fib6_info *rt6_add_route_info(struct net *net,
4311 const struct in6_addr *prefix, int prefixlen,
4312 const struct in6_addr *gwaddr,
4313 struct net_device *dev,
4314 unsigned int pref)
4315{
4316 struct fib6_config cfg = {
4317 .fc_metric = IP6_RT_PRIO_USER,
4318 .fc_ifindex = dev->ifindex,
4319 .fc_dst_len = prefixlen,
4320 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
4321 RTF_UP | RTF_PREF(pref),
4322 .fc_protocol = RTPROT_RA,
4323 .fc_type = RTN_UNICAST,
4324 .fc_nlinfo.portid = 0,
4325 .fc_nlinfo.nlh = NULL,
4326 .fc_nlinfo.nl_net = net,
4327 };
4328
4329 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
4330 cfg.fc_dst = *prefix;
4331 cfg.fc_gateway = *gwaddr;
4332
4333
4334 if (!prefixlen)
4335 cfg.fc_flags |= RTF_DEFAULT;
4336
4337 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
4338
4339 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
4340}
4341#endif
4342
4343struct fib6_info *rt6_get_dflt_router(struct net *net,
4344 const struct in6_addr *addr,
4345 struct net_device *dev)
4346{
4347 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
4348 struct fib6_info *rt;
4349 struct fib6_table *table;
4350
4351 table = fib6_get_table(net, tb_id);
4352 if (!table)
4353 return NULL;
4354
4355 rcu_read_lock();
4356 for_each_fib6_node_rt_rcu(&table->tb6_root) {
4357 struct fib6_nh *nh;
4358
4359
4360 if (rt->nh)
4361 continue;
4362
4363 nh = rt->fib6_nh;
4364 if (dev == nh->fib_nh_dev &&
4365 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
4366 ipv6_addr_equal(&nh->fib_nh_gw6, addr))
4367 break;
4368 }
4369 if (rt && !fib6_info_hold_safe(rt))
4370 rt = NULL;
4371 rcu_read_unlock();
4372 return rt;
4373}
4374
4375struct fib6_info *rt6_add_dflt_router(struct net *net,
4376 const struct in6_addr *gwaddr,
4377 struct net_device *dev,
4378 unsigned int pref,
4379 u32 defrtr_usr_metric)
4380{
4381 struct fib6_config cfg = {
4382 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
4383 .fc_metric = defrtr_usr_metric,
4384 .fc_ifindex = dev->ifindex,
4385 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
4386 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
4387 .fc_protocol = RTPROT_RA,
4388 .fc_type = RTN_UNICAST,
4389 .fc_nlinfo.portid = 0,
4390 .fc_nlinfo.nlh = NULL,
4391 .fc_nlinfo.nl_net = net,
4392 };
4393
4394 cfg.fc_gateway = *gwaddr;
4395
4396 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
4397 struct fib6_table *table;
4398
4399 table = fib6_get_table(dev_net(dev), cfg.fc_table);
4400 if (table)
4401 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
4402 }
4403
4404 return rt6_get_dflt_router(net, gwaddr, dev);
4405}
4406
4407static void __rt6_purge_dflt_routers(struct net *net,
4408 struct fib6_table *table)
4409{
4410 struct fib6_info *rt;
4411
4412restart:
4413 rcu_read_lock();
4414 for_each_fib6_node_rt_rcu(&table->tb6_root) {
4415 struct net_device *dev = fib6_info_nh_dev(rt);
4416 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
4417
4418 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
4419 (!idev || idev->cnf.accept_ra != 2) &&
4420 fib6_info_hold_safe(rt)) {
4421 rcu_read_unlock();
4422 ip6_del_rt(net, rt, false);
4423 goto restart;
4424 }
4425 }
4426 rcu_read_unlock();
4427
4428 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
4429}
4430
4431void rt6_purge_dflt_routers(struct net *net)
4432{
4433 struct fib6_table *table;
4434 struct hlist_head *head;
4435 unsigned int h;
4436
4437 rcu_read_lock();
4438
4439 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
4440 head = &net->ipv6.fib_table_hash[h];
4441 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
4442 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
4443 __rt6_purge_dflt_routers(net, table);
4444 }
4445 }
4446
4447 rcu_read_unlock();
4448}
4449
4450static void rtmsg_to_fib6_config(struct net *net,
4451 struct in6_rtmsg *rtmsg,
4452 struct fib6_config *cfg)
4453{
4454 *cfg = (struct fib6_config){
4455 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
4456 : RT6_TABLE_MAIN,
4457 .fc_ifindex = rtmsg->rtmsg_ifindex,
4458 .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
4459 .fc_expires = rtmsg->rtmsg_info,
4460 .fc_dst_len = rtmsg->rtmsg_dst_len,
4461 .fc_src_len = rtmsg->rtmsg_src_len,
4462 .fc_flags = rtmsg->rtmsg_flags,
4463 .fc_type = rtmsg->rtmsg_type,
4464
4465 .fc_nlinfo.nl_net = net,
4466
4467 .fc_dst = rtmsg->rtmsg_dst,
4468 .fc_src = rtmsg->rtmsg_src,
4469 .fc_gateway = rtmsg->rtmsg_gateway,
4470 };
4471}
4472
4473int ipv6_route_ioctl(struct net *net, unsigned int cmd, struct in6_rtmsg *rtmsg)
4474{
4475 struct fib6_config cfg;
4476 int err;
4477
4478 if (cmd != SIOCADDRT && cmd != SIOCDELRT)
4479 return -EINVAL;
4480 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
4481 return -EPERM;
4482
4483 rtmsg_to_fib6_config(net, rtmsg, &cfg);
4484
4485 rtnl_lock();
4486 switch (cmd) {
4487 case SIOCADDRT:
4488 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
4489 break;
4490 case SIOCDELRT:
4491 err = ip6_route_del(&cfg, NULL);
4492 break;
4493 }
4494 rtnl_unlock();
4495 return err;
4496}
4497
4498
4499
4500
4501
4502static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
4503{
4504 struct dst_entry *dst = skb_dst(skb);
4505 struct net *net = dev_net(dst->dev);
4506 struct inet6_dev *idev;
4507 int type;
4508
4509 if (netif_is_l3_master(skb->dev) &&
4510 dst->dev == net->loopback_dev)
4511 idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
4512 else
4513 idev = ip6_dst_idev(dst);
4514
4515 switch (ipstats_mib_noroutes) {
4516 case IPSTATS_MIB_INNOROUTES:
4517 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
4518 if (type == IPV6_ADDR_ANY) {
4519 IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
4520 break;
4521 }
4522 fallthrough;
4523 case IPSTATS_MIB_OUTNOROUTES:
4524 IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
4525 break;
4526 }
4527
4528
4529 if (netif_is_l3_master(skb->dev))
4530 skb_dst_drop(skb);
4531
4532 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
4533 kfree_skb(skb);
4534 return 0;
4535}
4536
4537static int ip6_pkt_discard(struct sk_buff *skb)
4538{
4539 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
4540}
4541
4542static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
4543{
4544 skb->dev = skb_dst(skb)->dev;
4545 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
4546}
4547
4548static int ip6_pkt_prohibit(struct sk_buff *skb)
4549{
4550 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
4551}
4552
4553static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
4554{
4555 skb->dev = skb_dst(skb)->dev;
4556 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
4557}
4558
4559
4560
4561
4562
4563struct fib6_info *addrconf_f6i_alloc(struct net *net,
4564 struct inet6_dev *idev,
4565 const struct in6_addr *addr,
4566 bool anycast, gfp_t gfp_flags)
4567{
4568 struct fib6_config cfg = {
4569 .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
4570 .fc_ifindex = idev->dev->ifindex,
4571 .fc_flags = RTF_UP | RTF_NONEXTHOP,
4572 .fc_dst = *addr,
4573 .fc_dst_len = 128,
4574 .fc_protocol = RTPROT_KERNEL,
4575 .fc_nlinfo.nl_net = net,
4576 .fc_ignore_dev_down = true,
4577 };
4578 struct fib6_info *f6i;
4579
4580 if (anycast) {
4581 cfg.fc_type = RTN_ANYCAST;
4582 cfg.fc_flags |= RTF_ANYCAST;
4583 } else {
4584 cfg.fc_type = RTN_LOCAL;
4585 cfg.fc_flags |= RTF_LOCAL;
4586 }
4587
4588 f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
4589 if (!IS_ERR(f6i))
4590 f6i->dst_nocount = true;
4591 return f6i;
4592}
4593
4594
4595struct arg_dev_net_ip {
4596 struct net_device *dev;
4597 struct net *net;
4598 struct in6_addr *addr;
4599};
4600
4601static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
4602{
4603 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
4604 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
4605 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
4606
4607 if (!rt->nh &&
4608 ((void *)rt->fib6_nh->fib_nh_dev == dev || !dev) &&
4609 rt != net->ipv6.fib6_null_entry &&
4610 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
4611 spin_lock_bh(&rt6_exception_lock);
4612
4613 rt->fib6_prefsrc.plen = 0;
4614 spin_unlock_bh(&rt6_exception_lock);
4615 }
4616 return 0;
4617}
4618
4619void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
4620{
4621 struct net *net = dev_net(ifp->idev->dev);
4622 struct arg_dev_net_ip adni = {
4623 .dev = ifp->idev->dev,
4624 .net = net,
4625 .addr = &ifp->addr,
4626 };
4627 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
4628}
4629
4630#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
4631
4632
4633static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
4634{
4635 struct in6_addr *gateway = (struct in6_addr *)arg;
4636 struct fib6_nh *nh;
4637
4638
4639 if (rt->nh)
4640 return 0;
4641
4642 nh = rt->fib6_nh;
4643 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
4644 nh->fib_nh_gw_family && ipv6_addr_equal(gateway, &nh->fib_nh_gw6))
4645 return -1;
4646
4647
4648
4649
4650
4651 fib6_nh_exceptions_clean_tohost(nh, gateway);
4652
4653 return 0;
4654}
4655
4656void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
4657{
4658 fib6_clean_all(net, fib6_clean_tohost, gateway);
4659}
4660
4661struct arg_netdev_event {
4662 const struct net_device *dev;
4663 union {
4664 unsigned char nh_flags;
4665 unsigned long event;
4666 };
4667};
4668
4669static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
4670{
4671 struct fib6_info *iter;
4672 struct fib6_node *fn;
4673
4674 fn = rcu_dereference_protected(rt->fib6_node,
4675 lockdep_is_held(&rt->fib6_table->tb6_lock));
4676 iter = rcu_dereference_protected(fn->leaf,
4677 lockdep_is_held(&rt->fib6_table->tb6_lock));
4678 while (iter) {
4679 if (iter->fib6_metric == rt->fib6_metric &&
4680 rt6_qualify_for_ecmp(iter))
4681 return iter;
4682 iter = rcu_dereference_protected(iter->fib6_next,
4683 lockdep_is_held(&rt->fib6_table->tb6_lock));
4684 }
4685
4686 return NULL;
4687}
4688
4689
4690static bool rt6_is_dead(const struct fib6_info *rt)
4691{
4692 if (rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD ||
4693 (rt->fib6_nh->fib_nh_flags & RTNH_F_LINKDOWN &&
4694 ip6_ignore_linkdown(rt->fib6_nh->fib_nh_dev)))
4695 return true;
4696
4697 return false;
4698}
4699
4700static int rt6_multipath_total_weight(const struct fib6_info *rt)
4701{
4702 struct fib6_info *iter;
4703 int total = 0;
4704
4705 if (!rt6_is_dead(rt))
4706 total += rt->fib6_nh->fib_nh_weight;
4707
4708 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
4709 if (!rt6_is_dead(iter))
4710 total += iter->fib6_nh->fib_nh_weight;
4711 }
4712
4713 return total;
4714}
4715
4716static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
4717{
4718 int upper_bound = -1;
4719
4720 if (!rt6_is_dead(rt)) {
4721 *weight += rt->fib6_nh->fib_nh_weight;
4722 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
4723 total) - 1;
4724 }
4725 atomic_set(&rt->fib6_nh->fib_nh_upper_bound, upper_bound);
4726}
4727
4728static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
4729{
4730 struct fib6_info *iter;
4731 int weight = 0;
4732
4733 rt6_upper_bound_set(rt, &weight, total);
4734
4735 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4736 rt6_upper_bound_set(iter, &weight, total);
4737}
4738
4739void rt6_multipath_rebalance(struct fib6_info *rt)
4740{
4741 struct fib6_info *first;
4742 int total;
4743
4744
4745
4746
4747
4748 if (!rt->fib6_nsiblings || rt->should_flush)
4749 return;
4750
4751
4752
4753
4754
4755 first = rt6_multipath_first_sibling(rt);
4756 if (WARN_ON_ONCE(!first))
4757 return;
4758
4759 total = rt6_multipath_total_weight(first);
4760 rt6_multipath_upper_bound_set(first, total);
4761}
4762
4763static int fib6_ifup(struct fib6_info *rt, void *p_arg)
4764{
4765 const struct arg_netdev_event *arg = p_arg;
4766 struct net *net = dev_net(arg->dev);
4767
4768 if (rt != net->ipv6.fib6_null_entry && !rt->nh &&
4769 rt->fib6_nh->fib_nh_dev == arg->dev) {
4770 rt->fib6_nh->fib_nh_flags &= ~arg->nh_flags;
4771 fib6_update_sernum_upto_root(net, rt);
4772 rt6_multipath_rebalance(rt);
4773 }
4774
4775 return 0;
4776}
4777
4778void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
4779{
4780 struct arg_netdev_event arg = {
4781 .dev = dev,
4782 {
4783 .nh_flags = nh_flags,
4784 },
4785 };
4786
4787 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
4788 arg.nh_flags |= RTNH_F_LINKDOWN;
4789
4790 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
4791}
4792
4793
4794static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
4795 const struct net_device *dev)
4796{
4797 struct fib6_info *iter;
4798
4799 if (rt->fib6_nh->fib_nh_dev == dev)
4800 return true;
4801 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4802 if (iter->fib6_nh->fib_nh_dev == dev)
4803 return true;
4804
4805 return false;
4806}
4807
4808static void rt6_multipath_flush(struct fib6_info *rt)
4809{
4810 struct fib6_info *iter;
4811
4812 rt->should_flush = 1;
4813 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4814 iter->should_flush = 1;
4815}
4816
4817static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
4818 const struct net_device *down_dev)
4819{
4820 struct fib6_info *iter;
4821 unsigned int dead = 0;
4822
4823 if (rt->fib6_nh->fib_nh_dev == down_dev ||
4824 rt->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
4825 dead++;
4826 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4827 if (iter->fib6_nh->fib_nh_dev == down_dev ||
4828 iter->fib6_nh->fib_nh_flags & RTNH_F_DEAD)
4829 dead++;
4830
4831 return dead;
4832}
4833
4834static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
4835 const struct net_device *dev,
4836 unsigned char nh_flags)
4837{
4838 struct fib6_info *iter;
4839
4840 if (rt->fib6_nh->fib_nh_dev == dev)
4841 rt->fib6_nh->fib_nh_flags |= nh_flags;
4842 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4843 if (iter->fib6_nh->fib_nh_dev == dev)
4844 iter->fib6_nh->fib_nh_flags |= nh_flags;
4845}
4846
4847
4848static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
4849{
4850 const struct arg_netdev_event *arg = p_arg;
4851 const struct net_device *dev = arg->dev;
4852 struct net *net = dev_net(dev);
4853
4854 if (rt == net->ipv6.fib6_null_entry || rt->nh)
4855 return 0;
4856
4857 switch (arg->event) {
4858 case NETDEV_UNREGISTER:
4859 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
4860 case NETDEV_DOWN:
4861 if (rt->should_flush)
4862 return -1;
4863 if (!rt->fib6_nsiblings)
4864 return rt->fib6_nh->fib_nh_dev == dev ? -1 : 0;
4865 if (rt6_multipath_uses_dev(rt, dev)) {
4866 unsigned int count;
4867
4868 count = rt6_multipath_dead_count(rt, dev);
4869 if (rt->fib6_nsiblings + 1 == count) {
4870 rt6_multipath_flush(rt);
4871 return -1;
4872 }
4873 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4874 RTNH_F_LINKDOWN);
4875 fib6_update_sernum(net, rt);
4876 rt6_multipath_rebalance(rt);
4877 }
4878 return -2;
4879 case NETDEV_CHANGE:
4880 if (rt->fib6_nh->fib_nh_dev != dev ||
4881 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
4882 break;
4883 rt->fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
4884 rt6_multipath_rebalance(rt);
4885 break;
4886 }
4887
4888 return 0;
4889}
4890
4891void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
4892{
4893 struct arg_netdev_event arg = {
4894 .dev = dev,
4895 {
4896 .event = event,
4897 },
4898 };
4899 struct net *net = dev_net(dev);
4900
4901 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4902 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4903 else
4904 fib6_clean_all(net, fib6_ifdown, &arg);
4905}
4906
4907void rt6_disable_ip(struct net_device *dev, unsigned long event)
4908{
4909 rt6_sync_down_dev(dev, event);
4910 rt6_uncached_list_flush_dev(dev_net(dev), dev);
4911 neigh_ifdown(&nd_tbl, dev);
4912}
4913
4914struct rt6_mtu_change_arg {
4915 struct net_device *dev;
4916 unsigned int mtu;
4917 struct fib6_info *f6i;
4918};
4919
4920static int fib6_nh_mtu_change(struct fib6_nh *nh, void *_arg)
4921{
4922 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *)_arg;
4923 struct fib6_info *f6i = arg->f6i;
4924
4925
4926
4927
4928
4929
4930 if (nh->fib_nh_dev == arg->dev) {
4931 struct inet6_dev *idev = __in6_dev_get(arg->dev);
4932 u32 mtu = f6i->fib6_pmtu;
4933
4934 if (mtu >= arg->mtu ||
4935 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4936 fib6_metric_set(f6i, RTAX_MTU, arg->mtu);
4937
4938 spin_lock_bh(&rt6_exception_lock);
4939 rt6_exceptions_update_pmtu(idev, nh, arg->mtu);
4940 spin_unlock_bh(&rt6_exception_lock);
4941 }
4942
4943 return 0;
4944}
4945
4946static int rt6_mtu_change_route(struct fib6_info *f6i, void *p_arg)
4947{
4948 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4949 struct inet6_dev *idev;
4950
4951
4952
4953
4954
4955
4956
4957 idev = __in6_dev_get(arg->dev);
4958 if (!idev)
4959 return 0;
4960
4961 if (fib6_metric_locked(f6i, RTAX_MTU))
4962 return 0;
4963
4964 arg->f6i = f6i;
4965 if (f6i->nh) {
4966
4967 return nexthop_for_each_fib6_nh(f6i->nh, fib6_nh_mtu_change,
4968 arg);
4969 }
4970
4971 return fib6_nh_mtu_change(f6i->fib6_nh, arg);
4972}
4973
4974void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
4975{
4976 struct rt6_mtu_change_arg arg = {
4977 .dev = dev,
4978 .mtu = mtu,
4979 };
4980
4981 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
4982}
4983
4984static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
4985 [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 },
4986 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
4987 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
4988 [RTA_OIF] = { .type = NLA_U32 },
4989 [RTA_IIF] = { .type = NLA_U32 },
4990 [RTA_PRIORITY] = { .type = NLA_U32 },
4991 [RTA_METRICS] = { .type = NLA_NESTED },
4992 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
4993 [RTA_PREF] = { .type = NLA_U8 },
4994 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4995 [RTA_ENCAP] = { .type = NLA_NESTED },
4996 [RTA_EXPIRES] = { .type = NLA_U32 },
4997 [RTA_UID] = { .type = NLA_U32 },
4998 [RTA_MARK] = { .type = NLA_U32 },
4999 [RTA_TABLE] = { .type = NLA_U32 },
5000 [RTA_IP_PROTO] = { .type = NLA_U8 },
5001 [RTA_SPORT] = { .type = NLA_U16 },
5002 [RTA_DPORT] = { .type = NLA_U16 },
5003 [RTA_NH_ID] = { .type = NLA_U32 },
5004};
5005
5006static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
5007 struct fib6_config *cfg,
5008 struct netlink_ext_ack *extack)
5009{
5010 struct rtmsg *rtm;
5011 struct nlattr *tb[RTA_MAX+1];
5012 unsigned int pref;
5013 int err;
5014
5015 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5016 rtm_ipv6_policy, extack);
5017 if (err < 0)
5018 goto errout;
5019
5020 err = -EINVAL;
5021 rtm = nlmsg_data(nlh);
5022
5023 *cfg = (struct fib6_config){
5024 .fc_table = rtm->rtm_table,
5025 .fc_dst_len = rtm->rtm_dst_len,
5026 .fc_src_len = rtm->rtm_src_len,
5027 .fc_flags = RTF_UP,
5028 .fc_protocol = rtm->rtm_protocol,
5029 .fc_type = rtm->rtm_type,
5030
5031 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
5032 .fc_nlinfo.nlh = nlh,
5033 .fc_nlinfo.nl_net = sock_net(skb->sk),
5034 };
5035
5036 if (rtm->rtm_type == RTN_UNREACHABLE ||
5037 rtm->rtm_type == RTN_BLACKHOLE ||
5038 rtm->rtm_type == RTN_PROHIBIT ||
5039 rtm->rtm_type == RTN_THROW)
5040 cfg->fc_flags |= RTF_REJECT;
5041
5042 if (rtm->rtm_type == RTN_LOCAL)
5043 cfg->fc_flags |= RTF_LOCAL;
5044
5045 if (rtm->rtm_flags & RTM_F_CLONED)
5046 cfg->fc_flags |= RTF_CACHE;
5047
5048 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
5049
5050 if (tb[RTA_NH_ID]) {
5051 if (tb[RTA_GATEWAY] || tb[RTA_OIF] ||
5052 tb[RTA_MULTIPATH] || tb[RTA_ENCAP]) {
5053 NL_SET_ERR_MSG(extack,
5054 "Nexthop specification and nexthop id are mutually exclusive");
5055 goto errout;
5056 }
5057 cfg->fc_nh_id = nla_get_u32(tb[RTA_NH_ID]);
5058 }
5059
5060 if (tb[RTA_GATEWAY]) {
5061 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
5062 cfg->fc_flags |= RTF_GATEWAY;
5063 }
5064 if (tb[RTA_VIA]) {
5065 NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
5066 goto errout;
5067 }
5068
5069 if (tb[RTA_DST]) {
5070 int plen = (rtm->rtm_dst_len + 7) >> 3;
5071
5072 if (nla_len(tb[RTA_DST]) < plen)
5073 goto errout;
5074
5075 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
5076 }
5077
5078 if (tb[RTA_SRC]) {
5079 int plen = (rtm->rtm_src_len + 7) >> 3;
5080
5081 if (nla_len(tb[RTA_SRC]) < plen)
5082 goto errout;
5083
5084 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
5085 }
5086
5087 if (tb[RTA_PREFSRC])
5088 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
5089
5090 if (tb[RTA_OIF])
5091 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
5092
5093 if (tb[RTA_PRIORITY])
5094 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
5095
5096 if (tb[RTA_METRICS]) {
5097 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
5098 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
5099 }
5100
5101 if (tb[RTA_TABLE])
5102 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
5103
5104 if (tb[RTA_MULTIPATH]) {
5105 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
5106 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
5107
5108 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
5109 cfg->fc_mp_len, extack);
5110 if (err < 0)
5111 goto errout;
5112 }
5113
5114 if (tb[RTA_PREF]) {
5115 pref = nla_get_u8(tb[RTA_PREF]);
5116 if (pref != ICMPV6_ROUTER_PREF_LOW &&
5117 pref != ICMPV6_ROUTER_PREF_HIGH)
5118 pref = ICMPV6_ROUTER_PREF_MEDIUM;
5119 cfg->fc_flags |= RTF_PREF(pref);
5120 }
5121
5122 if (tb[RTA_ENCAP])
5123 cfg->fc_encap = tb[RTA_ENCAP];
5124
5125 if (tb[RTA_ENCAP_TYPE]) {
5126 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
5127
5128 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
5129 if (err < 0)
5130 goto errout;
5131 }
5132
5133 if (tb[RTA_EXPIRES]) {
5134 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
5135
5136 if (addrconf_finite_timeout(timeout)) {
5137 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
5138 cfg->fc_flags |= RTF_EXPIRES;
5139 }
5140 }
5141
5142 err = 0;
5143errout:
5144 return err;
5145}
5146
5147struct rt6_nh {
5148 struct fib6_info *fib6_info;
5149 struct fib6_config r_cfg;
5150 struct list_head next;
5151};
5152
5153static int ip6_route_info_append(struct net *net,
5154 struct list_head *rt6_nh_list,
5155 struct fib6_info *rt,
5156 struct fib6_config *r_cfg)
5157{
5158 struct rt6_nh *nh;
5159 int err = -EEXIST;
5160
5161 list_for_each_entry(nh, rt6_nh_list, next) {
5162
5163 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
5164 return err;
5165 }
5166
5167 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
5168 if (!nh)
5169 return -ENOMEM;
5170 nh->fib6_info = rt;
5171 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
5172 list_add_tail(&nh->next, rt6_nh_list);
5173
5174 return 0;
5175}
5176
5177static void ip6_route_mpath_notify(struct fib6_info *rt,
5178 struct fib6_info *rt_last,
5179 struct nl_info *info,
5180 __u16 nlflags)
5181{
5182
5183
5184
5185
5186
5187
5188 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
5189 rt = list_first_entry(&rt_last->fib6_siblings,
5190 struct fib6_info,
5191 fib6_siblings);
5192 }
5193
5194 if (rt)
5195 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
5196}
5197
5198static bool ip6_route_mpath_should_notify(const struct fib6_info *rt)
5199{
5200 bool rt_can_ecmp = rt6_qualify_for_ecmp(rt);
5201 bool should_notify = false;
5202 struct fib6_info *leaf;
5203 struct fib6_node *fn;
5204
5205 rcu_read_lock();
5206 fn = rcu_dereference(rt->fib6_node);
5207 if (!fn)
5208 goto out;
5209
5210 leaf = rcu_dereference(fn->leaf);
5211 if (!leaf)
5212 goto out;
5213
5214 if (rt == leaf ||
5215 (rt_can_ecmp && rt->fib6_metric == leaf->fib6_metric &&
5216 rt6_qualify_for_ecmp(leaf)))
5217 should_notify = true;
5218out:
5219 rcu_read_unlock();
5220
5221 return should_notify;
5222}
5223
5224static int ip6_route_multipath_add(struct fib6_config *cfg,
5225 struct netlink_ext_ack *extack)
5226{
5227 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
5228 struct nl_info *info = &cfg->fc_nlinfo;
5229 struct fib6_config r_cfg;
5230 struct rtnexthop *rtnh;
5231 struct fib6_info *rt;
5232 struct rt6_nh *err_nh;
5233 struct rt6_nh *nh, *nh_safe;
5234 __u16 nlflags;
5235 int remaining;
5236 int attrlen;
5237 int err = 1;
5238 int nhn = 0;
5239 int replace = (cfg->fc_nlinfo.nlh &&
5240 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
5241 LIST_HEAD(rt6_nh_list);
5242
5243 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
5244 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
5245 nlflags |= NLM_F_APPEND;
5246
5247 remaining = cfg->fc_mp_len;
5248 rtnh = (struct rtnexthop *)cfg->fc_mp;
5249
5250
5251
5252
5253 while (rtnh_ok(rtnh, remaining)) {
5254 memcpy(&r_cfg, cfg, sizeof(*cfg));
5255 if (rtnh->rtnh_ifindex)
5256 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5257
5258 attrlen = rtnh_attrlen(rtnh);
5259 if (attrlen > 0) {
5260 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5261
5262 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5263 if (nla) {
5264 r_cfg.fc_gateway = nla_get_in6_addr(nla);
5265 r_cfg.fc_flags |= RTF_GATEWAY;
5266 }
5267 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
5268 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
5269 if (nla)
5270 r_cfg.fc_encap_type = nla_get_u16(nla);
5271 }
5272
5273 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
5274 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
5275 if (IS_ERR(rt)) {
5276 err = PTR_ERR(rt);
5277 rt = NULL;
5278 goto cleanup;
5279 }
5280 if (!rt6_qualify_for_ecmp(rt)) {
5281 err = -EINVAL;
5282 NL_SET_ERR_MSG(extack,
5283 "Device only routes can not be added for IPv6 using the multipath API.");
5284 fib6_info_release(rt);
5285 goto cleanup;
5286 }
5287
5288 rt->fib6_nh->fib_nh_weight = rtnh->rtnh_hops + 1;
5289
5290 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
5291 rt, &r_cfg);
5292 if (err) {
5293 fib6_info_release(rt);
5294 goto cleanup;
5295 }
5296
5297 rtnh = rtnh_next(rtnh, &remaining);
5298 }
5299
5300 if (list_empty(&rt6_nh_list)) {
5301 NL_SET_ERR_MSG(extack,
5302 "Invalid nexthop configuration - no valid nexthops");
5303 return -EINVAL;
5304 }
5305
5306
5307
5308
5309
5310 info->skip_notify = 1;
5311
5312
5313
5314
5315 info->skip_notify_kernel = 1;
5316
5317 err_nh = NULL;
5318 list_for_each_entry(nh, &rt6_nh_list, next) {
5319 err = __ip6_ins_rt(nh->fib6_info, info, extack);
5320 fib6_info_release(nh->fib6_info);
5321
5322 if (!err) {
5323
5324 rt_last = nh->fib6_info;
5325
5326
5327 if (!rt_notif)
5328 rt_notif = nh->fib6_info;
5329 }
5330
5331
5332 nh->fib6_info = NULL;
5333 if (err) {
5334 if (replace && nhn)
5335 NL_SET_ERR_MSG_MOD(extack,
5336 "multipath route replace failed (check consistency of installed routes)");
5337 err_nh = nh;
5338 goto add_errout;
5339 }
5340
5341
5342
5343
5344
5345
5346
5347
5348 if (cfg->fc_nlinfo.nlh) {
5349 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
5350 NLM_F_REPLACE);
5351 cfg->fc_nlinfo.nlh->nlmsg_flags |= NLM_F_CREATE;
5352 }
5353 nhn++;
5354 }
5355
5356
5357
5358
5359
5360
5361 if (ip6_route_mpath_should_notify(rt_notif)) {
5362 enum fib_event_type fib_event;
5363
5364 if (rt_notif->fib6_nsiblings != nhn - 1)
5365 fib_event = FIB_EVENT_ENTRY_APPEND;
5366 else
5367 fib_event = FIB_EVENT_ENTRY_REPLACE;
5368
5369 err = call_fib6_multipath_entry_notifiers(info->nl_net,
5370 fib_event, rt_notif,
5371 nhn - 1, extack);
5372 if (err) {
5373
5374 err_nh = NULL;
5375 goto add_errout;
5376 }
5377 }
5378
5379
5380 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5381 goto cleanup;
5382
5383add_errout:
5384
5385
5386
5387
5388 if (rt_notif)
5389 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
5390
5391
5392 list_for_each_entry(nh, &rt6_nh_list, next) {
5393 if (err_nh == nh)
5394 break;
5395 ip6_route_del(&nh->r_cfg, extack);
5396 }
5397
5398cleanup:
5399 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
5400 if (nh->fib6_info)
5401 fib6_info_release(nh->fib6_info);
5402 list_del(&nh->next);
5403 kfree(nh);
5404 }
5405
5406 return err;
5407}
5408
5409static int ip6_route_multipath_del(struct fib6_config *cfg,
5410 struct netlink_ext_ack *extack)
5411{
5412 struct fib6_config r_cfg;
5413 struct rtnexthop *rtnh;
5414 int last_err = 0;
5415 int remaining;
5416 int attrlen;
5417 int err;
5418
5419 remaining = cfg->fc_mp_len;
5420 rtnh = (struct rtnexthop *)cfg->fc_mp;
5421
5422
5423 while (rtnh_ok(rtnh, remaining)) {
5424 memcpy(&r_cfg, cfg, sizeof(*cfg));
5425 if (rtnh->rtnh_ifindex)
5426 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
5427
5428 attrlen = rtnh_attrlen(rtnh);
5429 if (attrlen > 0) {
5430 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
5431
5432 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
5433 if (nla) {
5434 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
5435 r_cfg.fc_flags |= RTF_GATEWAY;
5436 }
5437 }
5438 err = ip6_route_del(&r_cfg, extack);
5439 if (err)
5440 last_err = err;
5441
5442 rtnh = rtnh_next(rtnh, &remaining);
5443 }
5444
5445 return last_err;
5446}
5447
5448static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5449 struct netlink_ext_ack *extack)
5450{
5451 struct fib6_config cfg;
5452 int err;
5453
5454 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
5455 if (err < 0)
5456 return err;
5457
5458 if (cfg.fc_nh_id &&
5459 !nexthop_find_by_id(sock_net(skb->sk), cfg.fc_nh_id)) {
5460 NL_SET_ERR_MSG(extack, "Nexthop id does not exist");
5461 return -EINVAL;
5462 }
5463
5464 if (cfg.fc_mp)
5465 return ip6_route_multipath_del(&cfg, extack);
5466 else {
5467 cfg.fc_delete_all_nh = 1;
5468 return ip6_route_del(&cfg, extack);
5469 }
5470}
5471
5472static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
5473 struct netlink_ext_ack *extack)
5474{
5475 struct fib6_config cfg;
5476 int err;
5477
5478 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
5479 if (err < 0)
5480 return err;
5481
5482 if (cfg.fc_metric == 0)
5483 cfg.fc_metric = IP6_RT_PRIO_USER;
5484
5485 if (cfg.fc_mp)
5486 return ip6_route_multipath_add(&cfg, extack);
5487 else
5488 return ip6_route_add(&cfg, GFP_KERNEL, extack);
5489}
5490
5491
5492static int rt6_nh_nlmsg_size(struct fib6_nh *nh, void *arg)
5493{
5494 int *nexthop_len = arg;
5495
5496 *nexthop_len += nla_total_size(0)
5497 + NLA_ALIGN(sizeof(struct rtnexthop))
5498 + nla_total_size(16);
5499
5500 if (nh->fib_nh_lws) {
5501
5502 *nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5503
5504 *nexthop_len += nla_total_size(2);
5505 }
5506
5507 return 0;
5508}
5509
5510static size_t rt6_nlmsg_size(struct fib6_info *f6i)
5511{
5512 int nexthop_len;
5513
5514 if (f6i->nh) {
5515 nexthop_len = nla_total_size(4);
5516 nexthop_for_each_fib6_nh(f6i->nh, rt6_nh_nlmsg_size,
5517 &nexthop_len);
5518 } else {
5519 struct fib6_nh *nh = f6i->fib6_nh;
5520
5521 nexthop_len = 0;
5522 if (f6i->fib6_nsiblings) {
5523 nexthop_len = nla_total_size(0)
5524 + NLA_ALIGN(sizeof(struct rtnexthop))
5525 + nla_total_size(16)
5526 + lwtunnel_get_encap_size(nh->fib_nh_lws);
5527
5528 nexthop_len *= f6i->fib6_nsiblings;
5529 }
5530 nexthop_len += lwtunnel_get_encap_size(nh->fib_nh_lws);
5531 }
5532
5533 return NLMSG_ALIGN(sizeof(struct rtmsg))
5534 + nla_total_size(16)
5535 + nla_total_size(16)
5536 + nla_total_size(16)
5537 + nla_total_size(16)
5538 + nla_total_size(4)
5539 + nla_total_size(4)
5540 + nla_total_size(4)
5541 + nla_total_size(4)
5542 + RTAX_MAX * nla_total_size(4)
5543 + nla_total_size(sizeof(struct rta_cacheinfo))
5544 + nla_total_size(TCP_CA_NAME_MAX)
5545 + nla_total_size(1)
5546 + nexthop_len;
5547}
5548
5549static int rt6_fill_node_nexthop(struct sk_buff *skb, struct nexthop *nh,
5550 unsigned char *flags)
5551{
5552 if (nexthop_is_multipath(nh)) {
5553 struct nlattr *mp;
5554
5555 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
5556 if (!mp)
5557 goto nla_put_failure;
5558
5559 if (nexthop_mpath_fill_node(skb, nh, AF_INET6))
5560 goto nla_put_failure;
5561
5562 nla_nest_end(skb, mp);
5563 } else {
5564 struct fib6_nh *fib6_nh;
5565
5566 fib6_nh = nexthop_fib6_nh(nh);
5567 if (fib_nexthop_info(skb, &fib6_nh->nh_common, AF_INET6,
5568 flags, false) < 0)
5569 goto nla_put_failure;
5570 }
5571
5572 return 0;
5573
5574nla_put_failure:
5575 return -EMSGSIZE;
5576}
5577
5578static int rt6_fill_node(struct net *net, struct sk_buff *skb,
5579 struct fib6_info *rt, struct dst_entry *dst,
5580 struct in6_addr *dest, struct in6_addr *src,
5581 int iif, int type, u32 portid, u32 seq,
5582 unsigned int flags)
5583{
5584 struct rt6_info *rt6 = (struct rt6_info *)dst;
5585 struct rt6key *rt6_dst, *rt6_src;
5586 u32 *pmetrics, table, rt6_flags;
5587 unsigned char nh_flags = 0;
5588 struct nlmsghdr *nlh;
5589 struct rtmsg *rtm;
5590 long expires = 0;
5591
5592 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
5593 if (!nlh)
5594 return -EMSGSIZE;
5595
5596 if (rt6) {
5597 rt6_dst = &rt6->rt6i_dst;
5598 rt6_src = &rt6->rt6i_src;
5599 rt6_flags = rt6->rt6i_flags;
5600 } else {
5601 rt6_dst = &rt->fib6_dst;
5602 rt6_src = &rt->fib6_src;
5603 rt6_flags = rt->fib6_flags;
5604 }
5605
5606 rtm = nlmsg_data(nlh);
5607 rtm->rtm_family = AF_INET6;
5608 rtm->rtm_dst_len = rt6_dst->plen;
5609 rtm->rtm_src_len = rt6_src->plen;
5610 rtm->rtm_tos = 0;
5611 if (rt->fib6_table)
5612 table = rt->fib6_table->tb6_id;
5613 else
5614 table = RT6_TABLE_UNSPEC;
5615 rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
5616 if (nla_put_u32(skb, RTA_TABLE, table))
5617 goto nla_put_failure;
5618
5619 rtm->rtm_type = rt->fib6_type;
5620 rtm->rtm_flags = 0;
5621 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
5622 rtm->rtm_protocol = rt->fib6_protocol;
5623
5624 if (rt6_flags & RTF_CACHE)
5625 rtm->rtm_flags |= RTM_F_CLONED;
5626
5627 if (dest) {
5628 if (nla_put_in6_addr(skb, RTA_DST, dest))
5629 goto nla_put_failure;
5630 rtm->rtm_dst_len = 128;
5631 } else if (rtm->rtm_dst_len)
5632 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
5633 goto nla_put_failure;
5634#ifdef CONFIG_IPV6_SUBTREES
5635 if (src) {
5636 if (nla_put_in6_addr(skb, RTA_SRC, src))
5637 goto nla_put_failure;
5638 rtm->rtm_src_len = 128;
5639 } else if (rtm->rtm_src_len &&
5640 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
5641 goto nla_put_failure;
5642#endif
5643 if (iif) {
5644#ifdef CONFIG_IPV6_MROUTE
5645 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
5646 int err = ip6mr_get_route(net, skb, rtm, portid);
5647
5648 if (err == 0)
5649 return 0;
5650 if (err < 0)
5651 goto nla_put_failure;
5652 } else
5653#endif
5654 if (nla_put_u32(skb, RTA_IIF, iif))
5655 goto nla_put_failure;
5656 } else if (dest) {
5657 struct in6_addr saddr_buf;
5658 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
5659 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
5660 goto nla_put_failure;
5661 }
5662
5663 if (rt->fib6_prefsrc.plen) {
5664 struct in6_addr saddr_buf;
5665 saddr_buf = rt->fib6_prefsrc.addr;
5666 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
5667 goto nla_put_failure;
5668 }
5669
5670 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
5671 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
5672 goto nla_put_failure;
5673
5674 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
5675 goto nla_put_failure;
5676
5677
5678
5679
5680 if (rt6) {
5681 if (rt6_flags & RTF_GATEWAY &&
5682 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
5683 goto nla_put_failure;
5684
5685 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
5686 goto nla_put_failure;
5687
5688 if (dst->lwtstate &&
5689 lwtunnel_fill_encap(skb, dst->lwtstate, RTA_ENCAP, RTA_ENCAP_TYPE) < 0)
5690 goto nla_put_failure;
5691 } else if (rt->fib6_nsiblings) {
5692 struct fib6_info *sibling, *next_sibling;
5693 struct nlattr *mp;
5694
5695 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
5696 if (!mp)
5697 goto nla_put_failure;
5698
5699 if (fib_add_nexthop(skb, &rt->fib6_nh->nh_common,
5700 rt->fib6_nh->fib_nh_weight, AF_INET6) < 0)
5701 goto nla_put_failure;
5702
5703 list_for_each_entry_safe(sibling, next_sibling,
5704 &rt->fib6_siblings, fib6_siblings) {
5705 if (fib_add_nexthop(skb, &sibling->fib6_nh->nh_common,
5706 sibling->fib6_nh->fib_nh_weight,
5707 AF_INET6) < 0)
5708 goto nla_put_failure;
5709 }
5710
5711 nla_nest_end(skb, mp);
5712 } else if (rt->nh) {
5713 if (nla_put_u32(skb, RTA_NH_ID, rt->nh->id))
5714 goto nla_put_failure;
5715
5716 if (nexthop_is_blackhole(rt->nh))
5717 rtm->rtm_type = RTN_BLACKHOLE;
5718
5719 if (net->ipv4.sysctl_nexthop_compat_mode &&
5720 rt6_fill_node_nexthop(skb, rt->nh, &nh_flags) < 0)
5721 goto nla_put_failure;
5722
5723 rtm->rtm_flags |= nh_flags;
5724 } else {
5725 if (fib_nexthop_info(skb, &rt->fib6_nh->nh_common, AF_INET6,
5726 &nh_flags, false) < 0)
5727 goto nla_put_failure;
5728
5729 rtm->rtm_flags |= nh_flags;
5730 }
5731
5732 if (rt6_flags & RTF_EXPIRES) {
5733 expires = dst ? dst->expires : rt->expires;
5734 expires -= jiffies;
5735 }
5736
5737 if (!dst) {
5738 if (rt->offload)
5739 rtm->rtm_flags |= RTM_F_OFFLOAD;
5740 if (rt->trap)
5741 rtm->rtm_flags |= RTM_F_TRAP;
5742 if (rt->offload_failed)
5743 rtm->rtm_flags |= RTM_F_OFFLOAD_FAILED;
5744 }
5745
5746 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
5747 goto nla_put_failure;
5748
5749 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
5750 goto nla_put_failure;
5751
5752
5753 nlmsg_end(skb, nlh);
5754 return 0;
5755
5756nla_put_failure:
5757 nlmsg_cancel(skb, nlh);
5758 return -EMSGSIZE;
5759}
5760
5761static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg)
5762{
5763 const struct net_device *dev = arg;
5764
5765 if (nh->fib_nh_dev == dev)
5766 return 1;
5767
5768 return 0;
5769}
5770
5771static bool fib6_info_uses_dev(const struct fib6_info *f6i,
5772 const struct net_device *dev)
5773{
5774 if (f6i->nh) {
5775 struct net_device *_dev = (struct net_device *)dev;
5776
5777 return !!nexthop_for_each_fib6_nh(f6i->nh,
5778 fib6_info_nh_uses_dev,
5779 _dev);
5780 }
5781
5782 if (f6i->fib6_nh->fib_nh_dev == dev)
5783 return true;
5784
5785 if (f6i->fib6_nsiblings) {
5786 struct fib6_info *sibling, *next_sibling;
5787
5788 list_for_each_entry_safe(sibling, next_sibling,
5789 &f6i->fib6_siblings, fib6_siblings) {
5790 if (sibling->fib6_nh->fib_nh_dev == dev)
5791 return true;
5792 }
5793 }
5794
5795 return false;
5796}
5797
5798struct fib6_nh_exception_dump_walker {
5799 struct rt6_rtnl_dump_arg *dump;
5800 struct fib6_info *rt;
5801 unsigned int flags;
5802 unsigned int skip;
5803 unsigned int count;
5804};
5805
5806static int rt6_nh_dump_exceptions(struct fib6_nh *nh, void *arg)
5807{
5808 struct fib6_nh_exception_dump_walker *w = arg;
5809 struct rt6_rtnl_dump_arg *dump = w->dump;
5810 struct rt6_exception_bucket *bucket;
5811 struct rt6_exception *rt6_ex;
5812 int i, err;
5813
5814 bucket = fib6_nh_get_excptn_bucket(nh, NULL);
5815 if (!bucket)
5816 return 0;
5817
5818 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
5819 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
5820 if (w->skip) {
5821 w->skip--;
5822 continue;
5823 }
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836 if (rt6_check_expired(rt6_ex->rt6i)) {
5837 w->count++;
5838 continue;
5839 }
5840
5841 err = rt6_fill_node(dump->net, dump->skb, w->rt,
5842 &rt6_ex->rt6i->dst, NULL, NULL, 0,
5843 RTM_NEWROUTE,
5844 NETLINK_CB(dump->cb->skb).portid,
5845 dump->cb->nlh->nlmsg_seq, w->flags);
5846 if (err)
5847 return err;
5848
5849 w->count++;
5850 }
5851 bucket++;
5852 }
5853
5854 return 0;
5855}
5856
5857
5858int rt6_dump_route(struct fib6_info *rt, void *p_arg, unsigned int skip)
5859{
5860 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
5861 struct fib_dump_filter *filter = &arg->filter;
5862 unsigned int flags = NLM_F_MULTI;
5863 struct net *net = arg->net;
5864 int count = 0;
5865
5866 if (rt == net->ipv6.fib6_null_entry)
5867 return -1;
5868
5869 if ((filter->flags & RTM_F_PREFIX) &&
5870 !(rt->fib6_flags & RTF_PREFIX_RT)) {
5871
5872 return -1;
5873 }
5874 if (filter->filter_set &&
5875 ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
5876 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
5877 (filter->protocol && rt->fib6_protocol != filter->protocol))) {
5878 return -1;
5879 }
5880
5881 if (filter->filter_set ||
5882 !filter->dump_routes || !filter->dump_exceptions) {
5883 flags |= NLM_F_DUMP_FILTERED;
5884 }
5885
5886 if (filter->dump_routes) {
5887 if (skip) {
5888 skip--;
5889 } else {
5890 if (rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL,
5891 0, RTM_NEWROUTE,
5892 NETLINK_CB(arg->cb->skb).portid,
5893 arg->cb->nlh->nlmsg_seq, flags)) {
5894 return 0;
5895 }
5896 count++;
5897 }
5898 }
5899
5900 if (filter->dump_exceptions) {
5901 struct fib6_nh_exception_dump_walker w = { .dump = arg,
5902 .rt = rt,
5903 .flags = flags,
5904 .skip = skip,
5905 .count = 0 };
5906 int err;
5907
5908 rcu_read_lock();
5909 if (rt->nh) {
5910 err = nexthop_for_each_fib6_nh(rt->nh,
5911 rt6_nh_dump_exceptions,
5912 &w);
5913 } else {
5914 err = rt6_nh_dump_exceptions(rt->fib6_nh, &w);
5915 }
5916 rcu_read_unlock();
5917
5918 if (err)
5919 return count += w.count;
5920 }
5921
5922 return -1;
5923}
5924
5925static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
5926 const struct nlmsghdr *nlh,
5927 struct nlattr **tb,
5928 struct netlink_ext_ack *extack)
5929{
5930 struct rtmsg *rtm;
5931 int i, err;
5932
5933 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
5934 NL_SET_ERR_MSG_MOD(extack,
5935 "Invalid header for get route request");
5936 return -EINVAL;
5937 }
5938
5939 if (!netlink_strict_get_check(skb))
5940 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
5941 rtm_ipv6_policy, extack);
5942
5943 rtm = nlmsg_data(nlh);
5944 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
5945 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
5946 rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
5947 rtm->rtm_type) {
5948 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
5949 return -EINVAL;
5950 }
5951 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
5952 NL_SET_ERR_MSG_MOD(extack,
5953 "Invalid flags for get route request");
5954 return -EINVAL;
5955 }
5956
5957 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
5958 rtm_ipv6_policy, extack);
5959 if (err)
5960 return err;
5961
5962 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
5963 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
5964 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
5965 return -EINVAL;
5966 }
5967
5968 for (i = 0; i <= RTA_MAX; i++) {
5969 if (!tb[i])
5970 continue;
5971
5972 switch (i) {
5973 case RTA_SRC:
5974 case RTA_DST:
5975 case RTA_IIF:
5976 case RTA_OIF:
5977 case RTA_MARK:
5978 case RTA_UID:
5979 case RTA_SPORT:
5980 case RTA_DPORT:
5981 case RTA_IP_PROTO:
5982 break;
5983 default:
5984 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
5985 return -EINVAL;
5986 }
5987 }
5988
5989 return 0;
5990}
5991
5992static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5993 struct netlink_ext_ack *extack)
5994{
5995 struct net *net = sock_net(in_skb->sk);
5996 struct nlattr *tb[RTA_MAX+1];
5997 int err, iif = 0, oif = 0;
5998 struct fib6_info *from;
5999 struct dst_entry *dst;
6000 struct rt6_info *rt;
6001 struct sk_buff *skb;
6002 struct rtmsg *rtm;
6003 struct flowi6 fl6 = {};
6004 bool fibmatch;
6005
6006 err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
6007 if (err < 0)
6008 goto errout;
6009
6010 err = -EINVAL;
6011 rtm = nlmsg_data(nlh);
6012 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
6013 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
6014
6015 if (tb[RTA_SRC]) {
6016 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
6017 goto errout;
6018
6019 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
6020 }
6021
6022 if (tb[RTA_DST]) {
6023 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
6024 goto errout;
6025
6026 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
6027 }
6028
6029 if (tb[RTA_IIF])
6030 iif = nla_get_u32(tb[RTA_IIF]);
6031
6032 if (tb[RTA_OIF])
6033 oif = nla_get_u32(tb[RTA_OIF]);
6034
6035 if (tb[RTA_MARK])
6036 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
6037
6038 if (tb[RTA_UID])
6039 fl6.flowi6_uid = make_kuid(current_user_ns(),
6040 nla_get_u32(tb[RTA_UID]));
6041 else
6042 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
6043
6044 if (tb[RTA_SPORT])
6045 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
6046
6047 if (tb[RTA_DPORT])
6048 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
6049
6050 if (tb[RTA_IP_PROTO]) {
6051 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
6052 &fl6.flowi6_proto, AF_INET6,
6053 extack);
6054 if (err)
6055 goto errout;
6056 }
6057
6058 if (iif) {
6059 struct net_device *dev;
6060 int flags = 0;
6061
6062 rcu_read_lock();
6063
6064 dev = dev_get_by_index_rcu(net, iif);
6065 if (!dev) {
6066 rcu_read_unlock();
6067 err = -ENODEV;
6068 goto errout;
6069 }
6070
6071 fl6.flowi6_iif = iif;
6072
6073 if (!ipv6_addr_any(&fl6.saddr))
6074 flags |= RT6_LOOKUP_F_HAS_SADDR;
6075
6076 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
6077
6078 rcu_read_unlock();
6079 } else {
6080 fl6.flowi6_oif = oif;
6081
6082 dst = ip6_route_output(net, NULL, &fl6);
6083 }
6084
6085
6086 rt = container_of(dst, struct rt6_info, dst);
6087 if (rt->dst.error) {
6088 err = rt->dst.error;
6089 ip6_rt_put(rt);
6090 goto errout;
6091 }
6092
6093 if (rt == net->ipv6.ip6_null_entry) {
6094 err = rt->dst.error;
6095 ip6_rt_put(rt);
6096 goto errout;
6097 }
6098
6099 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
6100 if (!skb) {
6101 ip6_rt_put(rt);
6102 err = -ENOBUFS;
6103 goto errout;
6104 }
6105
6106 skb_dst_set(skb, &rt->dst);
6107
6108 rcu_read_lock();
6109 from = rcu_dereference(rt->from);
6110 if (from) {
6111 if (fibmatch)
6112 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
6113 iif, RTM_NEWROUTE,
6114 NETLINK_CB(in_skb).portid,
6115 nlh->nlmsg_seq, 0);
6116 else
6117 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
6118 &fl6.saddr, iif, RTM_NEWROUTE,
6119 NETLINK_CB(in_skb).portid,
6120 nlh->nlmsg_seq, 0);
6121 } else {
6122 err = -ENETUNREACH;
6123 }
6124 rcu_read_unlock();
6125
6126 if (err < 0) {
6127 kfree_skb(skb);
6128 goto errout;
6129 }
6130
6131 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
6132errout:
6133 return err;
6134}
6135
6136void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
6137 unsigned int nlm_flags)
6138{
6139 struct sk_buff *skb;
6140 struct net *net = info->nl_net;
6141 u32 seq;
6142 int err;
6143
6144 err = -ENOBUFS;
6145 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6146
6147 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6148 if (!skb)
6149 goto errout;
6150
6151 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6152 event, info->portid, seq, nlm_flags);
6153 if (err < 0) {
6154
6155 WARN_ON(err == -EMSGSIZE);
6156 kfree_skb(skb);
6157 goto errout;
6158 }
6159 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6160 info->nlh, gfp_any());
6161 return;
6162errout:
6163 if (err < 0)
6164 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6165}
6166
6167void fib6_rt_update(struct net *net, struct fib6_info *rt,
6168 struct nl_info *info)
6169{
6170 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
6171 struct sk_buff *skb;
6172 int err = -ENOBUFS;
6173
6174 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
6175 if (!skb)
6176 goto errout;
6177
6178 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
6179 RTM_NEWROUTE, info->portid, seq, NLM_F_REPLACE);
6180 if (err < 0) {
6181
6182 WARN_ON(err == -EMSGSIZE);
6183 kfree_skb(skb);
6184 goto errout;
6185 }
6186 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
6187 info->nlh, gfp_any());
6188 return;
6189errout:
6190 if (err < 0)
6191 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6192}
6193
6194void fib6_info_hw_flags_set(struct net *net, struct fib6_info *f6i,
6195 bool offload, bool trap, bool offload_failed)
6196{
6197 struct sk_buff *skb;
6198 int err;
6199
6200 if (f6i->offload == offload && f6i->trap == trap &&
6201 f6i->offload_failed == offload_failed)
6202 return;
6203
6204 f6i->offload = offload;
6205 f6i->trap = trap;
6206
6207
6208 if (net->ipv6.sysctl.fib_notify_on_flag_change == 2 &&
6209 f6i->offload_failed == offload_failed)
6210 return;
6211
6212 f6i->offload_failed = offload_failed;
6213
6214 if (!rcu_access_pointer(f6i->fib6_node))
6215
6216
6217
6218 return;
6219
6220 if (!net->ipv6.sysctl.fib_notify_on_flag_change)
6221 return;
6222
6223 skb = nlmsg_new(rt6_nlmsg_size(f6i), GFP_KERNEL);
6224 if (!skb) {
6225 err = -ENOBUFS;
6226 goto errout;
6227 }
6228
6229 err = rt6_fill_node(net, skb, f6i, NULL, NULL, NULL, 0, RTM_NEWROUTE, 0,
6230 0, 0);
6231 if (err < 0) {
6232
6233 WARN_ON(err == -EMSGSIZE);
6234 kfree_skb(skb);
6235 goto errout;
6236 }
6237
6238 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_ROUTE, NULL, GFP_KERNEL);
6239 return;
6240
6241errout:
6242 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
6243}
6244EXPORT_SYMBOL(fib6_info_hw_flags_set);
6245
6246static int ip6_route_dev_notify(struct notifier_block *this,
6247 unsigned long event, void *ptr)
6248{
6249 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
6250 struct net *net = dev_net(dev);
6251
6252 if (!(dev->flags & IFF_LOOPBACK))
6253 return NOTIFY_OK;
6254
6255 if (event == NETDEV_REGISTER) {
6256 net->ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = dev;
6257 net->ipv6.ip6_null_entry->dst.dev = dev;
6258 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
6259#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6260 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
6261 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
6262 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
6263 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
6264#endif
6265 } else if (event == NETDEV_UNREGISTER &&
6266 dev->reg_state != NETREG_UNREGISTERED) {
6267
6268
6269
6270 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
6271#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6272 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
6273 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
6274#endif
6275 }
6276
6277 return NOTIFY_OK;
6278}
6279
6280
6281
6282
6283
6284#ifdef CONFIG_PROC_FS
6285static int rt6_stats_seq_show(struct seq_file *seq, void *v)
6286{
6287 struct net *net = (struct net *)seq->private;
6288 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
6289 net->ipv6.rt6_stats->fib_nodes,
6290 net->ipv6.rt6_stats->fib_route_nodes,
6291 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
6292 net->ipv6.rt6_stats->fib_rt_entries,
6293 net->ipv6.rt6_stats->fib_rt_cache,
6294 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
6295 net->ipv6.rt6_stats->fib_discarded_routes);
6296
6297 return 0;
6298}
6299#endif
6300
6301#ifdef CONFIG_SYSCTL
6302
6303static int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
6304 void *buffer, size_t *lenp, loff_t *ppos)
6305{
6306 struct net *net;
6307 int delay;
6308 int ret;
6309 if (!write)
6310 return -EINVAL;
6311
6312 net = (struct net *)ctl->extra1;
6313 delay = net->ipv6.sysctl.flush_delay;
6314 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6315 if (ret)
6316 return ret;
6317
6318 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
6319 return 0;
6320}
6321
6322static struct ctl_table ipv6_route_table_template[] = {
6323 {
6324 .procname = "flush",
6325 .data = &init_net.ipv6.sysctl.flush_delay,
6326 .maxlen = sizeof(int),
6327 .mode = 0200,
6328 .proc_handler = ipv6_sysctl_rtcache_flush
6329 },
6330 {
6331 .procname = "gc_thresh",
6332 .data = &ip6_dst_ops_template.gc_thresh,
6333 .maxlen = sizeof(int),
6334 .mode = 0644,
6335 .proc_handler = proc_dointvec,
6336 },
6337 {
6338 .procname = "max_size",
6339 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
6340 .maxlen = sizeof(int),
6341 .mode = 0644,
6342 .proc_handler = proc_dointvec,
6343 },
6344 {
6345 .procname = "gc_min_interval",
6346 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
6347 .maxlen = sizeof(int),
6348 .mode = 0644,
6349 .proc_handler = proc_dointvec_jiffies,
6350 },
6351 {
6352 .procname = "gc_timeout",
6353 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
6354 .maxlen = sizeof(int),
6355 .mode = 0644,
6356 .proc_handler = proc_dointvec_jiffies,
6357 },
6358 {
6359 .procname = "gc_interval",
6360 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
6361 .maxlen = sizeof(int),
6362 .mode = 0644,
6363 .proc_handler = proc_dointvec_jiffies,
6364 },
6365 {
6366 .procname = "gc_elasticity",
6367 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
6368 .maxlen = sizeof(int),
6369 .mode = 0644,
6370 .proc_handler = proc_dointvec,
6371 },
6372 {
6373 .procname = "mtu_expires",
6374 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
6375 .maxlen = sizeof(int),
6376 .mode = 0644,
6377 .proc_handler = proc_dointvec_jiffies,
6378 },
6379 {
6380 .procname = "min_adv_mss",
6381 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
6382 .maxlen = sizeof(int),
6383 .mode = 0644,
6384 .proc_handler = proc_dointvec,
6385 },
6386 {
6387 .procname = "gc_min_interval_ms",
6388 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
6389 .maxlen = sizeof(int),
6390 .mode = 0644,
6391 .proc_handler = proc_dointvec_ms_jiffies,
6392 },
6393 {
6394 .procname = "skip_notify_on_dev_down",
6395 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
6396 .maxlen = sizeof(int),
6397 .mode = 0644,
6398 .proc_handler = proc_dointvec_minmax,
6399 .extra1 = SYSCTL_ZERO,
6400 .extra2 = SYSCTL_ONE,
6401 },
6402 { }
6403};
6404
6405struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
6406{
6407 struct ctl_table *table;
6408
6409 table = kmemdup(ipv6_route_table_template,
6410 sizeof(ipv6_route_table_template),
6411 GFP_KERNEL);
6412
6413 if (table) {
6414 table[0].data = &net->ipv6.sysctl.flush_delay;
6415 table[0].extra1 = net;
6416 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
6417 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
6418 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6419 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
6420 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
6421 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
6422 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
6423 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
6424 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
6425 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
6426
6427
6428 if (net->user_ns != &init_user_ns)
6429 table[0].procname = NULL;
6430 }
6431
6432 return table;
6433}
6434#endif
6435
6436static int __net_init ip6_route_net_init(struct net *net)
6437{
6438 int ret = -ENOMEM;
6439
6440 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
6441 sizeof(net->ipv6.ip6_dst_ops));
6442
6443 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
6444 goto out_ip6_dst_ops;
6445
6446 net->ipv6.fib6_null_entry = fib6_info_alloc(GFP_KERNEL, true);
6447 if (!net->ipv6.fib6_null_entry)
6448 goto out_ip6_dst_entries;
6449 memcpy(net->ipv6.fib6_null_entry, &fib6_null_entry_template,
6450 sizeof(*net->ipv6.fib6_null_entry));
6451
6452 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
6453 sizeof(*net->ipv6.ip6_null_entry),
6454 GFP_KERNEL);
6455 if (!net->ipv6.ip6_null_entry)
6456 goto out_fib6_null_entry;
6457 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6458 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
6459 ip6_template_metrics, true);
6460 INIT_LIST_HEAD(&net->ipv6.ip6_null_entry->rt6i_uncached);
6461
6462#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6463 net->ipv6.fib6_has_custom_rules = false;
6464 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
6465 sizeof(*net->ipv6.ip6_prohibit_entry),
6466 GFP_KERNEL);
6467 if (!net->ipv6.ip6_prohibit_entry)
6468 goto out_ip6_null_entry;
6469 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6470 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
6471 ip6_template_metrics, true);
6472 INIT_LIST_HEAD(&net->ipv6.ip6_prohibit_entry->rt6i_uncached);
6473
6474 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
6475 sizeof(*net->ipv6.ip6_blk_hole_entry),
6476 GFP_KERNEL);
6477 if (!net->ipv6.ip6_blk_hole_entry)
6478 goto out_ip6_prohibit_entry;
6479 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
6480 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
6481 ip6_template_metrics, true);
6482 INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
6483#ifdef CONFIG_IPV6_SUBTREES
6484 net->ipv6.fib6_routes_require_src = 0;
6485#endif
6486#endif
6487
6488 net->ipv6.sysctl.flush_delay = 0;
6489 net->ipv6.sysctl.ip6_rt_max_size = 4096;
6490 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
6491 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
6492 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
6493 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
6494 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
6495 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
6496 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
6497
6498 net->ipv6.ip6_rt_gc_expire = 30*HZ;
6499
6500 ret = 0;
6501out:
6502 return ret;
6503
6504#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6505out_ip6_prohibit_entry:
6506 kfree(net->ipv6.ip6_prohibit_entry);
6507out_ip6_null_entry:
6508 kfree(net->ipv6.ip6_null_entry);
6509#endif
6510out_fib6_null_entry:
6511 kfree(net->ipv6.fib6_null_entry);
6512out_ip6_dst_entries:
6513 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
6514out_ip6_dst_ops:
6515 goto out;
6516}
6517
6518static void __net_exit ip6_route_net_exit(struct net *net)
6519{
6520 kfree(net->ipv6.fib6_null_entry);
6521 kfree(net->ipv6.ip6_null_entry);
6522#ifdef CONFIG_IPV6_MULTIPLE_TABLES
6523 kfree(net->ipv6.ip6_prohibit_entry);
6524 kfree(net->ipv6.ip6_blk_hole_entry);
6525#endif
6526 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
6527}
6528
6529static int __net_init ip6_route_net_init_late(struct net *net)
6530{
6531#ifdef CONFIG_PROC_FS
6532 proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
6533 sizeof(struct ipv6_route_iter));
6534 proc_create_net_single("rt6_stats", 0444, net->proc_net,
6535 rt6_stats_seq_show, NULL);
6536#endif
6537 return 0;
6538}
6539
6540static void __net_exit ip6_route_net_exit_late(struct net *net)
6541{
6542#ifdef CONFIG_PROC_FS
6543 remove_proc_entry("ipv6_route", net->proc_net);
6544 remove_proc_entry("rt6_stats", net->proc_net);
6545#endif
6546}
6547
6548static struct pernet_operations ip6_route_net_ops = {
6549 .init = ip6_route_net_init,
6550 .exit = ip6_route_net_exit,
6551};
6552
6553static int __net_init ipv6_inetpeer_init(struct net *net)
6554{
6555 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
6556
6557 if (!bp)
6558 return -ENOMEM;
6559 inet_peer_base_init(bp);
6560 net->ipv6.peers = bp;
6561 return 0;
6562}
6563
6564static void __net_exit ipv6_inetpeer_exit(struct net *net)
6565{
6566 struct inet_peer_base *bp = net->ipv6.peers;
6567
6568 net->ipv6.peers = NULL;
6569 inetpeer_invalidate_tree(bp);
6570 kfree(bp);
6571}
6572
6573static struct pernet_operations ipv6_inetpeer_ops = {
6574 .init = ipv6_inetpeer_init,
6575 .exit = ipv6_inetpeer_exit,
6576};
6577
6578static struct pernet_operations ip6_route_net_late_ops = {
6579 .init = ip6_route_net_init_late,
6580 .exit = ip6_route_net_exit_late,
6581};
6582
6583static struct notifier_block ip6_route_dev_notifier = {
6584 .notifier_call = ip6_route_dev_notify,
6585 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
6586};
6587
6588void __init ip6_route_init_special_entries(void)
6589{
6590
6591
6592
6593 init_net.ipv6.fib6_null_entry->fib6_nh->fib_nh_dev = init_net.loopback_dev;
6594 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
6595 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6596 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
6597 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
6598 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6599 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
6600 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
6601 #endif
6602}
6603
6604#if IS_BUILTIN(CONFIG_IPV6)
6605#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6606DEFINE_BPF_ITER_FUNC(ipv6_route, struct bpf_iter_meta *meta, struct fib6_info *rt)
6607
6608BTF_ID_LIST(btf_fib6_info_id)
6609BTF_ID(struct, fib6_info)
6610
6611static const struct bpf_iter_seq_info ipv6_route_seq_info = {
6612 .seq_ops = &ipv6_route_seq_ops,
6613 .init_seq_private = bpf_iter_init_seq_net,
6614 .fini_seq_private = bpf_iter_fini_seq_net,
6615 .seq_priv_size = sizeof(struct ipv6_route_iter),
6616};
6617
6618static struct bpf_iter_reg ipv6_route_reg_info = {
6619 .target = "ipv6_route",
6620 .ctx_arg_info_size = 1,
6621 .ctx_arg_info = {
6622 { offsetof(struct bpf_iter__ipv6_route, rt),
6623 PTR_TO_BTF_ID_OR_NULL },
6624 },
6625 .seq_info = &ipv6_route_seq_info,
6626};
6627
6628static int __init bpf_iter_register(void)
6629{
6630 ipv6_route_reg_info.ctx_arg_info[0].btf_id = *btf_fib6_info_id;
6631 return bpf_iter_reg_target(&ipv6_route_reg_info);
6632}
6633
6634static void bpf_iter_unregister(void)
6635{
6636 bpf_iter_unreg_target(&ipv6_route_reg_info);
6637}
6638#endif
6639#endif
6640
6641int __init ip6_route_init(void)
6642{
6643 int ret;
6644 int cpu;
6645
6646 ret = -ENOMEM;
6647 ip6_dst_ops_template.kmem_cachep =
6648 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
6649 SLAB_HWCACHE_ALIGN, NULL);
6650 if (!ip6_dst_ops_template.kmem_cachep)
6651 goto out;
6652
6653 ret = dst_entries_init(&ip6_dst_blackhole_ops);
6654 if (ret)
6655 goto out_kmem_cache;
6656
6657 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
6658 if (ret)
6659 goto out_dst_entries;
6660
6661 ret = register_pernet_subsys(&ip6_route_net_ops);
6662 if (ret)
6663 goto out_register_inetpeer;
6664
6665 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
6666
6667 ret = fib6_init();
6668 if (ret)
6669 goto out_register_subsys;
6670
6671 ret = xfrm6_init();
6672 if (ret)
6673 goto out_fib6_init;
6674
6675 ret = fib6_rules_init();
6676 if (ret)
6677 goto xfrm6_init;
6678
6679 ret = register_pernet_subsys(&ip6_route_net_late_ops);
6680 if (ret)
6681 goto fib6_rules_init;
6682
6683 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
6684 inet6_rtm_newroute, NULL, 0);
6685 if (ret < 0)
6686 goto out_register_late_subsys;
6687
6688 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
6689 inet6_rtm_delroute, NULL, 0);
6690 if (ret < 0)
6691 goto out_register_late_subsys;
6692
6693 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
6694 inet6_rtm_getroute, NULL,
6695 RTNL_FLAG_DOIT_UNLOCKED);
6696 if (ret < 0)
6697 goto out_register_late_subsys;
6698
6699 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
6700 if (ret)
6701 goto out_register_late_subsys;
6702
6703#if IS_BUILTIN(CONFIG_IPV6)
6704#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6705 ret = bpf_iter_register();
6706 if (ret)
6707 goto out_register_late_subsys;
6708#endif
6709#endif
6710
6711 for_each_possible_cpu(cpu) {
6712 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
6713
6714 INIT_LIST_HEAD(&ul->head);
6715 spin_lock_init(&ul->lock);
6716 }
6717
6718out:
6719 return ret;
6720
6721out_register_late_subsys:
6722 rtnl_unregister_all(PF_INET6);
6723 unregister_pernet_subsys(&ip6_route_net_late_ops);
6724fib6_rules_init:
6725 fib6_rules_cleanup();
6726xfrm6_init:
6727 xfrm6_fini();
6728out_fib6_init:
6729 fib6_gc_cleanup();
6730out_register_subsys:
6731 unregister_pernet_subsys(&ip6_route_net_ops);
6732out_register_inetpeer:
6733 unregister_pernet_subsys(&ipv6_inetpeer_ops);
6734out_dst_entries:
6735 dst_entries_destroy(&ip6_dst_blackhole_ops);
6736out_kmem_cache:
6737 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
6738 goto out;
6739}
6740
6741void ip6_route_cleanup(void)
6742{
6743#if IS_BUILTIN(CONFIG_IPV6)
6744#if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_PROC_FS)
6745 bpf_iter_unregister();
6746#endif
6747#endif
6748 unregister_netdevice_notifier(&ip6_route_dev_notifier);
6749 unregister_pernet_subsys(&ip6_route_net_late_ops);
6750 fib6_rules_cleanup();
6751 xfrm6_fini();
6752 fib6_gc_cleanup();
6753 unregister_pernet_subsys(&ipv6_inetpeer_ops);
6754 unregister_pernet_subsys(&ip6_route_net_ops);
6755 dst_entries_destroy(&ip6_dst_blackhole_ops);
6756 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
6757}
6758