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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 <net/net_namespace.h>
45#include <net/snmp.h>
46#include <net/ipv6.h>
47#include <net/ip6_fib.h>
48#include <net/ip6_route.h>
49#include <net/ndisc.h>
50#include <net/addrconf.h>
51#include <net/tcp.h>
52#include <linux/rtnetlink.h>
53#include <net/dst.h>
54#include <net/dst_metadata.h>
55#include <net/xfrm.h>
56#include <net/netevent.h>
57#include <net/netlink.h>
58#include <net/rtnh.h>
59#include <net/lwtunnel.h>
60#include <net/ip_tunnels.h>
61#include <net/l3mdev.h>
62#include <net/ip.h>
63#include <linux/uaccess.h>
64
65#ifdef CONFIG_SYSCTL
66#include <linux/sysctl.h>
67#endif
68
69static int ip6_rt_type_to_error(u8 fib6_type);
70
71#define CREATE_TRACE_POINTS
72#include <trace/events/fib6.h>
73EXPORT_TRACEPOINT_SYMBOL_GPL(fib6_table_lookup);
74#undef CREATE_TRACE_POINTS
75
76enum rt6_nud_state {
77 RT6_NUD_FAIL_HARD = -3,
78 RT6_NUD_FAIL_PROBE = -2,
79 RT6_NUD_FAIL_DO_RR = -1,
80 RT6_NUD_SUCCEED = 1
81};
82
83static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
84static unsigned int ip6_default_advmss(const struct dst_entry *dst);
85static unsigned int ip6_mtu(const struct dst_entry *dst);
86static struct dst_entry *ip6_negative_advice(struct dst_entry *);
87static void ip6_dst_destroy(struct dst_entry *);
88static void ip6_dst_ifdown(struct dst_entry *,
89 struct net_device *dev, int how);
90static int ip6_dst_gc(struct dst_ops *ops);
91
92static int ip6_pkt_discard(struct sk_buff *skb);
93static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
94static int ip6_pkt_prohibit(struct sk_buff *skb);
95static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
96static void ip6_link_failure(struct sk_buff *skb);
97static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
98 struct sk_buff *skb, u32 mtu);
99static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
100 struct sk_buff *skb);
101static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
102 int strict);
103static size_t rt6_nlmsg_size(struct fib6_info *rt);
104static int rt6_fill_node(struct net *net, struct sk_buff *skb,
105 struct fib6_info *rt, struct dst_entry *dst,
106 struct in6_addr *dest, struct in6_addr *src,
107 int iif, int type, u32 portid, u32 seq,
108 unsigned int flags);
109static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
110 const struct in6_addr *daddr,
111 const struct in6_addr *saddr);
112
113#ifdef CONFIG_IPV6_ROUTE_INFO
114static struct fib6_info *rt6_add_route_info(struct net *net,
115 const struct in6_addr *prefix, int prefixlen,
116 const struct in6_addr *gwaddr,
117 struct net_device *dev,
118 unsigned int pref);
119static struct fib6_info *rt6_get_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#endif
124
125struct uncached_list {
126 spinlock_t lock;
127 struct list_head head;
128};
129
130static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
131
132void rt6_uncached_list_add(struct rt6_info *rt)
133{
134 struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
135
136 rt->rt6i_uncached_list = ul;
137
138 spin_lock_bh(&ul->lock);
139 list_add_tail(&rt->rt6i_uncached, &ul->head);
140 spin_unlock_bh(&ul->lock);
141}
142
143void rt6_uncached_list_del(struct rt6_info *rt)
144{
145 if (!list_empty(&rt->rt6i_uncached)) {
146 struct uncached_list *ul = rt->rt6i_uncached_list;
147 struct net *net = dev_net(rt->dst.dev);
148
149 spin_lock_bh(&ul->lock);
150 list_del(&rt->rt6i_uncached);
151 atomic_dec(&net->ipv6.rt6_stats->fib_rt_uncache);
152 spin_unlock_bh(&ul->lock);
153 }
154}
155
156static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
157{
158 struct net_device *loopback_dev = net->loopback_dev;
159 int cpu;
160
161 if (dev == loopback_dev)
162 return;
163
164 for_each_possible_cpu(cpu) {
165 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
166 struct rt6_info *rt;
167
168 spin_lock_bh(&ul->lock);
169 list_for_each_entry(rt, &ul->head, rt6i_uncached) {
170 struct inet6_dev *rt_idev = rt->rt6i_idev;
171 struct net_device *rt_dev = rt->dst.dev;
172
173 if (rt_idev->dev == dev) {
174 rt->rt6i_idev = in6_dev_get(loopback_dev);
175 in6_dev_put(rt_idev);
176 }
177
178 if (rt_dev == dev) {
179 rt->dst.dev = loopback_dev;
180 dev_hold(rt->dst.dev);
181 dev_put(rt_dev);
182 }
183 }
184 spin_unlock_bh(&ul->lock);
185 }
186}
187
188static inline const void *choose_neigh_daddr(const struct in6_addr *p,
189 struct sk_buff *skb,
190 const void *daddr)
191{
192 if (!ipv6_addr_any(p))
193 return (const void *) p;
194 else if (skb)
195 return &ipv6_hdr(skb)->daddr;
196 return daddr;
197}
198
199struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
200 struct net_device *dev,
201 struct sk_buff *skb,
202 const void *daddr)
203{
204 struct neighbour *n;
205
206 daddr = choose_neigh_daddr(gw, skb, daddr);
207 n = __ipv6_neigh_lookup(dev, daddr);
208 if (n)
209 return n;
210
211 n = neigh_create(&nd_tbl, daddr, dev);
212 return IS_ERR(n) ? NULL : n;
213}
214
215static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,
216 struct sk_buff *skb,
217 const void *daddr)
218{
219 const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);
220
221 return ip6_neigh_lookup(rt6_nexthop(rt, &in6addr_any),
222 dst->dev, skb, daddr);
223}
224
225static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
226{
227 struct net_device *dev = dst->dev;
228 struct rt6_info *rt = (struct rt6_info *)dst;
229
230 daddr = choose_neigh_daddr(&rt->rt6i_gateway, NULL, daddr);
231 if (!daddr)
232 return;
233 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
234 return;
235 if (ipv6_addr_is_multicast((const struct in6_addr *)daddr))
236 return;
237 __ipv6_confirm_neigh(dev, daddr);
238}
239
240static struct dst_ops ip6_dst_ops_template = {
241 .family = AF_INET6,
242 .gc = ip6_dst_gc,
243 .gc_thresh = 1024,
244 .check = ip6_dst_check,
245 .default_advmss = ip6_default_advmss,
246 .mtu = ip6_mtu,
247 .cow_metrics = dst_cow_metrics_generic,
248 .destroy = ip6_dst_destroy,
249 .ifdown = ip6_dst_ifdown,
250 .negative_advice = ip6_negative_advice,
251 .link_failure = ip6_link_failure,
252 .update_pmtu = ip6_rt_update_pmtu,
253 .redirect = rt6_do_redirect,
254 .local_out = __ip6_local_out,
255 .neigh_lookup = ip6_dst_neigh_lookup,
256 .confirm_neigh = ip6_confirm_neigh,
257};
258
259static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
260{
261 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
262
263 return mtu ? : dst->dev->mtu;
264}
265
266static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
267 struct sk_buff *skb, u32 mtu)
268{
269}
270
271static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
272 struct sk_buff *skb)
273{
274}
275
276static struct dst_ops ip6_dst_blackhole_ops = {
277 .family = AF_INET6,
278 .destroy = ip6_dst_destroy,
279 .check = ip6_dst_check,
280 .mtu = ip6_blackhole_mtu,
281 .default_advmss = ip6_default_advmss,
282 .update_pmtu = ip6_rt_blackhole_update_pmtu,
283 .redirect = ip6_rt_blackhole_redirect,
284 .cow_metrics = dst_cow_metrics_generic,
285 .neigh_lookup = ip6_dst_neigh_lookup,
286};
287
288static const u32 ip6_template_metrics[RTAX_MAX] = {
289 [RTAX_HOPLIMIT - 1] = 0,
290};
291
292static const struct fib6_info fib6_null_entry_template = {
293 .fib6_flags = (RTF_REJECT | RTF_NONEXTHOP),
294 .fib6_protocol = RTPROT_KERNEL,
295 .fib6_metric = ~(u32)0,
296 .fib6_ref = REFCOUNT_INIT(1),
297 .fib6_type = RTN_UNREACHABLE,
298 .fib6_metrics = (struct dst_metrics *)&dst_default_metrics,
299};
300
301static const struct rt6_info ip6_null_entry_template = {
302 .dst = {
303 .__refcnt = ATOMIC_INIT(1),
304 .__use = 1,
305 .obsolete = DST_OBSOLETE_FORCE_CHK,
306 .error = -ENETUNREACH,
307 .input = ip6_pkt_discard,
308 .output = ip6_pkt_discard_out,
309 },
310 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
311};
312
313#ifdef CONFIG_IPV6_MULTIPLE_TABLES
314
315static const struct rt6_info ip6_prohibit_entry_template = {
316 .dst = {
317 .__refcnt = ATOMIC_INIT(1),
318 .__use = 1,
319 .obsolete = DST_OBSOLETE_FORCE_CHK,
320 .error = -EACCES,
321 .input = ip6_pkt_prohibit,
322 .output = ip6_pkt_prohibit_out,
323 },
324 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
325};
326
327static const struct rt6_info ip6_blk_hole_entry_template = {
328 .dst = {
329 .__refcnt = ATOMIC_INIT(1),
330 .__use = 1,
331 .obsolete = DST_OBSOLETE_FORCE_CHK,
332 .error = -EINVAL,
333 .input = dst_discard,
334 .output = dst_discard_out,
335 },
336 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
337};
338
339#endif
340
341static void rt6_info_init(struct rt6_info *rt)
342{
343 struct dst_entry *dst = &rt->dst;
344
345 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
346 INIT_LIST_HEAD(&rt->rt6i_uncached);
347}
348
349
350struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
351 int flags)
352{
353 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
354 1, DST_OBSOLETE_FORCE_CHK, flags);
355
356 if (rt) {
357 rt6_info_init(rt);
358 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
359 }
360
361 return rt;
362}
363EXPORT_SYMBOL(ip6_dst_alloc);
364
365static void ip6_dst_destroy(struct dst_entry *dst)
366{
367 struct rt6_info *rt = (struct rt6_info *)dst;
368 struct fib6_info *from;
369 struct inet6_dev *idev;
370
371 ip_dst_metrics_put(dst);
372 rt6_uncached_list_del(rt);
373
374 idev = rt->rt6i_idev;
375 if (idev) {
376 rt->rt6i_idev = NULL;
377 in6_dev_put(idev);
378 }
379
380 from = xchg((__force struct fib6_info **)&rt->from, NULL);
381 fib6_info_release(from);
382}
383
384static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
385 int how)
386{
387 struct rt6_info *rt = (struct rt6_info *)dst;
388 struct inet6_dev *idev = rt->rt6i_idev;
389 struct net_device *loopback_dev =
390 dev_net(dev)->loopback_dev;
391
392 if (idev && idev->dev != loopback_dev) {
393 struct inet6_dev *loopback_idev = in6_dev_get(loopback_dev);
394 if (loopback_idev) {
395 rt->rt6i_idev = loopback_idev;
396 in6_dev_put(idev);
397 }
398 }
399}
400
401static bool __rt6_check_expired(const struct rt6_info *rt)
402{
403 if (rt->rt6i_flags & RTF_EXPIRES)
404 return time_after(jiffies, rt->dst.expires);
405 else
406 return false;
407}
408
409static bool rt6_check_expired(const struct rt6_info *rt)
410{
411 struct fib6_info *from;
412
413 from = rcu_dereference(rt->from);
414
415 if (rt->rt6i_flags & RTF_EXPIRES) {
416 if (time_after(jiffies, rt->dst.expires))
417 return true;
418 } else if (from) {
419 return rt->dst.obsolete != DST_OBSOLETE_FORCE_CHK ||
420 fib6_check_expired(from);
421 }
422 return false;
423}
424
425void fib6_select_path(const struct net *net, struct fib6_result *res,
426 struct flowi6 *fl6, int oif, bool have_oif_match,
427 const struct sk_buff *skb, int strict)
428{
429 struct fib6_info *sibling, *next_sibling;
430 struct fib6_info *match = res->f6i;
431
432 if (!match->fib6_nsiblings || have_oif_match)
433 goto out;
434
435
436
437
438 if (!fl6->mp_hash)
439 fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
440
441 if (fl6->mp_hash <= atomic_read(&match->fib6_nh.fib_nh_upper_bound))
442 goto out;
443
444 list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
445 fib6_siblings) {
446 const struct fib6_nh *nh = &sibling->fib6_nh;
447 int nh_upper_bound;
448
449 nh_upper_bound = atomic_read(&nh->fib_nh_upper_bound);
450 if (fl6->mp_hash > nh_upper_bound)
451 continue;
452 if (rt6_score_route(nh, sibling->fib6_flags, oif, strict) < 0)
453 break;
454 match = sibling;
455 break;
456 }
457
458out:
459 res->f6i = match;
460 res->nh = &match->fib6_nh;
461}
462
463
464
465
466
467static bool __rt6_device_match(struct net *net, const struct fib6_nh *nh,
468 const struct in6_addr *saddr, int oif, int flags)
469{
470 const struct net_device *dev;
471
472 if (nh->fib_nh_flags & RTNH_F_DEAD)
473 return false;
474
475 dev = nh->fib_nh_dev;
476 if (oif) {
477 if (dev->ifindex == oif)
478 return true;
479 } else {
480 if (ipv6_chk_addr(net, saddr, dev,
481 flags & RT6_LOOKUP_F_IFACE))
482 return true;
483 }
484
485 return false;
486}
487
488static void rt6_device_match(struct net *net, struct fib6_result *res,
489 const struct in6_addr *saddr, int oif, int flags)
490{
491 struct fib6_info *f6i = res->f6i;
492 struct fib6_info *spf6i;
493 struct fib6_nh *nh;
494
495 if (!oif && ipv6_addr_any(saddr)) {
496 nh = &f6i->fib6_nh;
497 if (!(nh->fib_nh_flags & RTNH_F_DEAD))
498 goto out;
499 }
500
501 for (spf6i = f6i; spf6i; spf6i = rcu_dereference(spf6i->fib6_next)) {
502 nh = &spf6i->fib6_nh;
503 if (__rt6_device_match(net, nh, saddr, oif, flags)) {
504 res->f6i = spf6i;
505 goto out;
506 }
507 }
508
509 if (oif && flags & RT6_LOOKUP_F_IFACE) {
510 res->f6i = net->ipv6.fib6_null_entry;
511 nh = &res->f6i->fib6_nh;
512 goto out;
513 }
514
515 nh = &f6i->fib6_nh;
516 if (nh->fib_nh_flags & RTNH_F_DEAD) {
517 res->f6i = net->ipv6.fib6_null_entry;
518 nh = &res->f6i->fib6_nh;
519 }
520out:
521 res->nh = nh;
522 res->fib6_type = res->f6i->fib6_type;
523 res->fib6_flags = res->f6i->fib6_flags;
524}
525
526#ifdef CONFIG_IPV6_ROUTER_PREF
527struct __rt6_probe_work {
528 struct work_struct work;
529 struct in6_addr target;
530 struct net_device *dev;
531};
532
533static void rt6_probe_deferred(struct work_struct *w)
534{
535 struct in6_addr mcaddr;
536 struct __rt6_probe_work *work =
537 container_of(w, struct __rt6_probe_work, work);
538
539 addrconf_addr_solict_mult(&work->target, &mcaddr);
540 ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL, 0);
541 dev_put(work->dev);
542 kfree(work);
543}
544
545static void rt6_probe(struct fib6_nh *fib6_nh)
546{
547 struct __rt6_probe_work *work = NULL;
548 const struct in6_addr *nh_gw;
549 struct neighbour *neigh;
550 struct net_device *dev;
551 struct inet6_dev *idev;
552
553
554
555
556
557
558
559
560
561 if (fib6_nh->fib_nh_gw_family)
562 return;
563
564 nh_gw = &fib6_nh->fib_nh_gw6;
565 dev = fib6_nh->fib_nh_dev;
566 rcu_read_lock_bh();
567 idev = __in6_dev_get(dev);
568 neigh = __ipv6_neigh_lookup_noref(dev, nh_gw);
569 if (neigh) {
570 if (neigh->nud_state & NUD_VALID)
571 goto out;
572
573 write_lock(&neigh->lock);
574 if (!(neigh->nud_state & NUD_VALID) &&
575 time_after(jiffies,
576 neigh->updated + idev->cnf.rtr_probe_interval)) {
577 work = kmalloc(sizeof(*work), GFP_ATOMIC);
578 if (work)
579 __neigh_set_probe_once(neigh);
580 }
581 write_unlock(&neigh->lock);
582 } else if (time_after(jiffies, fib6_nh->last_probe +
583 idev->cnf.rtr_probe_interval)) {
584 work = kmalloc(sizeof(*work), GFP_ATOMIC);
585 }
586
587 if (work) {
588 fib6_nh->last_probe = jiffies;
589 INIT_WORK(&work->work, rt6_probe_deferred);
590 work->target = *nh_gw;
591 dev_hold(dev);
592 work->dev = dev;
593 schedule_work(&work->work);
594 }
595
596out:
597 rcu_read_unlock_bh();
598}
599#else
600static inline void rt6_probe(struct fib6_nh *fib6_nh)
601{
602}
603#endif
604
605
606
607
608static enum rt6_nud_state rt6_check_neigh(const struct fib6_nh *fib6_nh)
609{
610 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
611 struct neighbour *neigh;
612
613 rcu_read_lock_bh();
614 neigh = __ipv6_neigh_lookup_noref(fib6_nh->fib_nh_dev,
615 &fib6_nh->fib_nh_gw6);
616 if (neigh) {
617 read_lock(&neigh->lock);
618 if (neigh->nud_state & NUD_VALID)
619 ret = RT6_NUD_SUCCEED;
620#ifdef CONFIG_IPV6_ROUTER_PREF
621 else if (!(neigh->nud_state & NUD_FAILED))
622 ret = RT6_NUD_SUCCEED;
623 else
624 ret = RT6_NUD_FAIL_PROBE;
625#endif
626 read_unlock(&neigh->lock);
627 } else {
628 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
629 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
630 }
631 rcu_read_unlock_bh();
632
633 return ret;
634}
635
636static int rt6_score_route(const struct fib6_nh *nh, u32 fib6_flags, int oif,
637 int strict)
638{
639 int m = 0;
640
641 if (!oif || nh->fib_nh_dev->ifindex == oif)
642 m = 2;
643
644 if (!m && (strict & RT6_LOOKUP_F_IFACE))
645 return RT6_NUD_FAIL_HARD;
646#ifdef CONFIG_IPV6_ROUTER_PREF
647 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(fib6_flags)) << 2;
648#endif
649 if ((strict & RT6_LOOKUP_F_REACHABLE) &&
650 !(fib6_flags & RTF_NONEXTHOP) && nh->fib_nh_gw_family) {
651 int n = rt6_check_neigh(nh);
652 if (n < 0)
653 return n;
654 }
655 return m;
656}
657
658static bool find_match(struct fib6_nh *nh, u32 fib6_flags,
659 int oif, int strict, int *mpri, bool *do_rr)
660{
661 bool match_do_rr = false;
662 bool rc = false;
663 int m;
664
665 if (nh->fib_nh_flags & RTNH_F_DEAD)
666 goto out;
667
668 if (ip6_ignore_linkdown(nh->fib_nh_dev) &&
669 nh->fib_nh_flags & RTNH_F_LINKDOWN &&
670 !(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
671 goto out;
672
673 m = rt6_score_route(nh, fib6_flags, oif, strict);
674 if (m == RT6_NUD_FAIL_DO_RR) {
675 match_do_rr = true;
676 m = 0;
677 } else if (m == RT6_NUD_FAIL_HARD) {
678 goto out;
679 }
680
681 if (strict & RT6_LOOKUP_F_REACHABLE)
682 rt6_probe(nh);
683
684
685 if (m > *mpri) {
686 *do_rr = match_do_rr;
687 *mpri = m;
688 rc = true;
689 }
690out:
691 return rc;
692}
693
694static void __find_rr_leaf(struct fib6_info *f6i_start,
695 struct fib6_info *nomatch, u32 metric,
696 struct fib6_result *res, struct fib6_info **cont,
697 int oif, int strict, bool *do_rr, int *mpri)
698{
699 struct fib6_info *f6i;
700
701 for (f6i = f6i_start;
702 f6i && f6i != nomatch;
703 f6i = rcu_dereference(f6i->fib6_next)) {
704 struct fib6_nh *nh;
705
706 if (cont && f6i->fib6_metric != metric) {
707 *cont = f6i;
708 return;
709 }
710
711 if (fib6_check_expired(f6i))
712 continue;
713
714 nh = &f6i->fib6_nh;
715 if (find_match(nh, f6i->fib6_flags, oif, strict, mpri, do_rr)) {
716 res->f6i = f6i;
717 res->nh = nh;
718 res->fib6_flags = f6i->fib6_flags;
719 res->fib6_type = f6i->fib6_type;
720 }
721 }
722}
723
724static void find_rr_leaf(struct fib6_node *fn, struct fib6_info *leaf,
725 struct fib6_info *rr_head, int oif, int strict,
726 bool *do_rr, struct fib6_result *res)
727{
728 u32 metric = rr_head->fib6_metric;
729 struct fib6_info *cont = NULL;
730 int mpri = -1;
731
732 __find_rr_leaf(rr_head, NULL, metric, res, &cont,
733 oif, strict, do_rr, &mpri);
734
735 __find_rr_leaf(leaf, rr_head, metric, res, &cont,
736 oif, strict, do_rr, &mpri);
737
738 if (res->f6i || !cont)
739 return;
740
741 __find_rr_leaf(cont, NULL, metric, res, NULL,
742 oif, strict, do_rr, &mpri);
743}
744
745static void rt6_select(struct net *net, struct fib6_node *fn, int oif,
746 struct fib6_result *res, int strict)
747{
748 struct fib6_info *leaf = rcu_dereference(fn->leaf);
749 struct fib6_info *rt0;
750 bool do_rr = false;
751 int key_plen;
752
753
754 res->f6i = NULL;
755
756 if (!leaf || leaf == net->ipv6.fib6_null_entry)
757 goto out;
758
759 rt0 = rcu_dereference(fn->rr_ptr);
760 if (!rt0)
761 rt0 = leaf;
762
763
764
765
766
767
768 key_plen = rt0->fib6_dst.plen;
769#ifdef CONFIG_IPV6_SUBTREES
770 if (rt0->fib6_src.plen)
771 key_plen = rt0->fib6_src.plen;
772#endif
773 if (fn->fn_bit != key_plen)
774 goto out;
775
776 find_rr_leaf(fn, leaf, rt0, oif, strict, &do_rr, res);
777 if (do_rr) {
778 struct fib6_info *next = rcu_dereference(rt0->fib6_next);
779
780
781 if (!next || next->fib6_metric != rt0->fib6_metric)
782 next = leaf;
783
784 if (next != rt0) {
785 spin_lock_bh(&leaf->fib6_table->tb6_lock);
786
787 if (next->fib6_node)
788 rcu_assign_pointer(fn->rr_ptr, next);
789 spin_unlock_bh(&leaf->fib6_table->tb6_lock);
790 }
791 }
792
793out:
794 if (!res->f6i) {
795 res->f6i = net->ipv6.fib6_null_entry;
796 res->nh = &res->f6i->fib6_nh;
797 res->fib6_flags = res->f6i->fib6_flags;
798 res->fib6_type = res->f6i->fib6_type;
799 }
800}
801
802static bool rt6_is_gw_or_nonexthop(const struct fib6_result *res)
803{
804 return (res->f6i->fib6_flags & RTF_NONEXTHOP) ||
805 res->nh->fib_nh_gw_family;
806}
807
808#ifdef CONFIG_IPV6_ROUTE_INFO
809int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
810 const struct in6_addr *gwaddr)
811{
812 struct net *net = dev_net(dev);
813 struct route_info *rinfo = (struct route_info *) opt;
814 struct in6_addr prefix_buf, *prefix;
815 unsigned int pref;
816 unsigned long lifetime;
817 struct fib6_info *rt;
818
819 if (len < sizeof(struct route_info)) {
820 return -EINVAL;
821 }
822
823
824 if (rinfo->length > 3) {
825 return -EINVAL;
826 } else if (rinfo->prefix_len > 128) {
827 return -EINVAL;
828 } else if (rinfo->prefix_len > 64) {
829 if (rinfo->length < 2) {
830 return -EINVAL;
831 }
832 } else if (rinfo->prefix_len > 0) {
833 if (rinfo->length < 1) {
834 return -EINVAL;
835 }
836 }
837
838 pref = rinfo->route_pref;
839 if (pref == ICMPV6_ROUTER_PREF_INVALID)
840 return -EINVAL;
841
842 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
843
844 if (rinfo->length == 3)
845 prefix = (struct in6_addr *)rinfo->prefix;
846 else {
847
848 ipv6_addr_prefix(&prefix_buf,
849 (struct in6_addr *)rinfo->prefix,
850 rinfo->prefix_len);
851 prefix = &prefix_buf;
852 }
853
854 if (rinfo->prefix_len == 0)
855 rt = rt6_get_dflt_router(net, gwaddr, dev);
856 else
857 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
858 gwaddr, dev);
859
860 if (rt && !lifetime) {
861 ip6_del_rt(net, rt);
862 rt = NULL;
863 }
864
865 if (!rt && lifetime)
866 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
867 dev, pref);
868 else if (rt)
869 rt->fib6_flags = RTF_ROUTEINFO |
870 (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
871
872 if (rt) {
873 if (!addrconf_finite_timeout(lifetime))
874 fib6_clean_expires(rt);
875 else
876 fib6_set_expires(rt, jiffies + HZ * lifetime);
877
878 fib6_info_release(rt);
879 }
880 return 0;
881}
882#endif
883
884
885
886
887
888
889static struct net_device *ip6_rt_get_dev_rcu(const struct fib6_result *res)
890{
891 struct net_device *dev = res->nh->fib_nh_dev;
892
893 if (res->fib6_flags & (RTF_LOCAL | RTF_ANYCAST)) {
894
895
896
897
898 if (netif_is_l3_slave(dev) &&
899 !rt6_need_strict(&res->f6i->fib6_dst.addr))
900 dev = l3mdev_master_dev_rcu(dev);
901 else if (!netif_is_l3_master(dev))
902 dev = dev_net(dev)->loopback_dev;
903
904
905
906 }
907
908 return dev;
909}
910
911static const int fib6_prop[RTN_MAX + 1] = {
912 [RTN_UNSPEC] = 0,
913 [RTN_UNICAST] = 0,
914 [RTN_LOCAL] = 0,
915 [RTN_BROADCAST] = 0,
916 [RTN_ANYCAST] = 0,
917 [RTN_MULTICAST] = 0,
918 [RTN_BLACKHOLE] = -EINVAL,
919 [RTN_UNREACHABLE] = -EHOSTUNREACH,
920 [RTN_PROHIBIT] = -EACCES,
921 [RTN_THROW] = -EAGAIN,
922 [RTN_NAT] = -EINVAL,
923 [RTN_XRESOLVE] = -EINVAL,
924};
925
926static int ip6_rt_type_to_error(u8 fib6_type)
927{
928 return fib6_prop[fib6_type];
929}
930
931static unsigned short fib6_info_dst_flags(struct fib6_info *rt)
932{
933 unsigned short flags = 0;
934
935 if (rt->dst_nocount)
936 flags |= DST_NOCOUNT;
937 if (rt->dst_nopolicy)
938 flags |= DST_NOPOLICY;
939 if (rt->dst_host)
940 flags |= DST_HOST;
941
942 return flags;
943}
944
945static void ip6_rt_init_dst_reject(struct rt6_info *rt, u8 fib6_type)
946{
947 rt->dst.error = ip6_rt_type_to_error(fib6_type);
948
949 switch (fib6_type) {
950 case RTN_BLACKHOLE:
951 rt->dst.output = dst_discard_out;
952 rt->dst.input = dst_discard;
953 break;
954 case RTN_PROHIBIT:
955 rt->dst.output = ip6_pkt_prohibit_out;
956 rt->dst.input = ip6_pkt_prohibit;
957 break;
958 case RTN_THROW:
959 case RTN_UNREACHABLE:
960 default:
961 rt->dst.output = ip6_pkt_discard_out;
962 rt->dst.input = ip6_pkt_discard;
963 break;
964 }
965}
966
967static void ip6_rt_init_dst(struct rt6_info *rt, const struct fib6_result *res)
968{
969 struct fib6_info *f6i = res->f6i;
970
971 if (res->fib6_flags & RTF_REJECT) {
972 ip6_rt_init_dst_reject(rt, res->fib6_type);
973 return;
974 }
975
976 rt->dst.error = 0;
977 rt->dst.output = ip6_output;
978
979 if (res->fib6_type == RTN_LOCAL || res->fib6_type == RTN_ANYCAST) {
980 rt->dst.input = ip6_input;
981 } else if (ipv6_addr_type(&f6i->fib6_dst.addr) & IPV6_ADDR_MULTICAST) {
982 rt->dst.input = ip6_mc_input;
983 } else {
984 rt->dst.input = ip6_forward;
985 }
986
987 if (res->nh->fib_nh_lws) {
988 rt->dst.lwtstate = lwtstate_get(res->nh->fib_nh_lws);
989 lwtunnel_set_redirect(&rt->dst);
990 }
991
992 rt->dst.lastuse = jiffies;
993}
994
995
996static void rt6_set_from(struct rt6_info *rt, struct fib6_info *from)
997{
998 rt->rt6i_flags &= ~RTF_EXPIRES;
999 rcu_assign_pointer(rt->from, from);
1000 ip_dst_init_metrics(&rt->dst, from->fib6_metrics);
1001}
1002
1003
1004static void ip6_rt_copy_init(struct rt6_info *rt, const struct fib6_result *res)
1005{
1006 const struct fib6_nh *nh = res->nh;
1007 const struct net_device *dev = nh->fib_nh_dev;
1008 struct fib6_info *f6i = res->f6i;
1009
1010 ip6_rt_init_dst(rt, res);
1011
1012 rt->rt6i_dst = f6i->fib6_dst;
1013 rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
1014 rt->rt6i_flags = res->fib6_flags;
1015 if (nh->fib_nh_gw_family) {
1016 rt->rt6i_gateway = nh->fib_nh_gw6;
1017 rt->rt6i_flags |= RTF_GATEWAY;
1018 }
1019 rt6_set_from(rt, f6i);
1020#ifdef CONFIG_IPV6_SUBTREES
1021 rt->rt6i_src = f6i->fib6_src;
1022#endif
1023}
1024
1025static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
1026 struct in6_addr *saddr)
1027{
1028 struct fib6_node *pn, *sn;
1029 while (1) {
1030 if (fn->fn_flags & RTN_TL_ROOT)
1031 return NULL;
1032 pn = rcu_dereference(fn->parent);
1033 sn = FIB6_SUBTREE(pn);
1034 if (sn && sn != fn)
1035 fn = fib6_node_lookup(sn, NULL, saddr);
1036 else
1037 fn = pn;
1038 if (fn->fn_flags & RTN_RTINFO)
1039 return fn;
1040 }
1041}
1042
1043static bool ip6_hold_safe(struct net *net, struct rt6_info **prt)
1044{
1045 struct rt6_info *rt = *prt;
1046
1047 if (dst_hold_safe(&rt->dst))
1048 return true;
1049 if (net) {
1050 rt = net->ipv6.ip6_null_entry;
1051 dst_hold(&rt->dst);
1052 } else {
1053 rt = NULL;
1054 }
1055 *prt = rt;
1056 return false;
1057}
1058
1059
1060static struct rt6_info *ip6_create_rt_rcu(const struct fib6_result *res)
1061{
1062 struct net_device *dev = res->nh->fib_nh_dev;
1063 struct fib6_info *f6i = res->f6i;
1064 unsigned short flags;
1065 struct rt6_info *nrt;
1066
1067 if (!fib6_info_hold_safe(f6i))
1068 goto fallback;
1069
1070 flags = fib6_info_dst_flags(f6i);
1071 nrt = ip6_dst_alloc(dev_net(dev), dev, flags);
1072 if (!nrt) {
1073 fib6_info_release(f6i);
1074 goto fallback;
1075 }
1076
1077 ip6_rt_copy_init(nrt, res);
1078 return nrt;
1079
1080fallback:
1081 nrt = dev_net(dev)->ipv6.ip6_null_entry;
1082 dst_hold(&nrt->dst);
1083 return nrt;
1084}
1085
1086static struct rt6_info *ip6_pol_route_lookup(struct net *net,
1087 struct fib6_table *table,
1088 struct flowi6 *fl6,
1089 const struct sk_buff *skb,
1090 int flags)
1091{
1092 struct fib6_result res = {};
1093 struct fib6_node *fn;
1094 struct rt6_info *rt;
1095
1096 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1097 flags &= ~RT6_LOOKUP_F_IFACE;
1098
1099 rcu_read_lock();
1100 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1101restart:
1102 res.f6i = rcu_dereference(fn->leaf);
1103 if (!res.f6i)
1104 res.f6i = net->ipv6.fib6_null_entry;
1105 else
1106 rt6_device_match(net, &res, &fl6->saddr, fl6->flowi6_oif,
1107 flags);
1108
1109 if (res.f6i == net->ipv6.fib6_null_entry) {
1110 fn = fib6_backtrack(fn, &fl6->saddr);
1111 if (fn)
1112 goto restart;
1113
1114 rt = net->ipv6.ip6_null_entry;
1115 dst_hold(&rt->dst);
1116 goto out;
1117 }
1118
1119 fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
1120 fl6->flowi6_oif != 0, skb, flags);
1121
1122
1123 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
1124 if (rt) {
1125 if (ip6_hold_safe(net, &rt))
1126 dst_use_noref(&rt->dst, jiffies);
1127 } else {
1128 rt = ip6_create_rt_rcu(&res);
1129 }
1130
1131out:
1132 trace_fib6_table_lookup(net, &res, table, fl6);
1133
1134 rcu_read_unlock();
1135
1136 return rt;
1137}
1138
1139struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
1140 const struct sk_buff *skb, int flags)
1141{
1142 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_lookup);
1143}
1144EXPORT_SYMBOL_GPL(ip6_route_lookup);
1145
1146struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
1147 const struct in6_addr *saddr, int oif,
1148 const struct sk_buff *skb, int strict)
1149{
1150 struct flowi6 fl6 = {
1151 .flowi6_oif = oif,
1152 .daddr = *daddr,
1153 };
1154 struct dst_entry *dst;
1155 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
1156
1157 if (saddr) {
1158 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
1159 flags |= RT6_LOOKUP_F_HAS_SADDR;
1160 }
1161
1162 dst = fib6_rule_lookup(net, &fl6, skb, flags, ip6_pol_route_lookup);
1163 if (dst->error == 0)
1164 return (struct rt6_info *) dst;
1165
1166 dst_release(dst);
1167
1168 return NULL;
1169}
1170EXPORT_SYMBOL(rt6_lookup);
1171
1172
1173
1174
1175
1176
1177
1178static int __ip6_ins_rt(struct fib6_info *rt, struct nl_info *info,
1179 struct netlink_ext_ack *extack)
1180{
1181 int err;
1182 struct fib6_table *table;
1183
1184 table = rt->fib6_table;
1185 spin_lock_bh(&table->tb6_lock);
1186 err = fib6_add(&table->tb6_root, rt, info, extack);
1187 spin_unlock_bh(&table->tb6_lock);
1188
1189 return err;
1190}
1191
1192int ip6_ins_rt(struct net *net, struct fib6_info *rt)
1193{
1194 struct nl_info info = { .nl_net = net, };
1195
1196 return __ip6_ins_rt(rt, &info, NULL);
1197}
1198
1199static struct rt6_info *ip6_rt_cache_alloc(const struct fib6_result *res,
1200 const struct in6_addr *daddr,
1201 const struct in6_addr *saddr)
1202{
1203 struct fib6_info *f6i = res->f6i;
1204 struct net_device *dev;
1205 struct rt6_info *rt;
1206
1207
1208
1209
1210
1211 if (!fib6_info_hold_safe(f6i))
1212 return NULL;
1213
1214 dev = ip6_rt_get_dev_rcu(res);
1215 rt = ip6_dst_alloc(dev_net(dev), dev, 0);
1216 if (!rt) {
1217 fib6_info_release(f6i);
1218 return NULL;
1219 }
1220
1221 ip6_rt_copy_init(rt, res);
1222 rt->rt6i_flags |= RTF_CACHE;
1223 rt->dst.flags |= DST_HOST;
1224 rt->rt6i_dst.addr = *daddr;
1225 rt->rt6i_dst.plen = 128;
1226
1227 if (!rt6_is_gw_or_nonexthop(res)) {
1228 if (f6i->fib6_dst.plen != 128 &&
1229 ipv6_addr_equal(&f6i->fib6_dst.addr, daddr))
1230 rt->rt6i_flags |= RTF_ANYCAST;
1231#ifdef CONFIG_IPV6_SUBTREES
1232 if (rt->rt6i_src.plen && saddr) {
1233 rt->rt6i_src.addr = *saddr;
1234 rt->rt6i_src.plen = 128;
1235 }
1236#endif
1237 }
1238
1239 return rt;
1240}
1241
1242static struct rt6_info *ip6_rt_pcpu_alloc(const struct fib6_result *res)
1243{
1244 struct fib6_info *f6i = res->f6i;
1245 unsigned short flags = fib6_info_dst_flags(f6i);
1246 struct net_device *dev;
1247 struct rt6_info *pcpu_rt;
1248
1249 if (!fib6_info_hold_safe(f6i))
1250 return NULL;
1251
1252 rcu_read_lock();
1253 dev = ip6_rt_get_dev_rcu(res);
1254 pcpu_rt = ip6_dst_alloc(dev_net(dev), dev, flags);
1255 rcu_read_unlock();
1256 if (!pcpu_rt) {
1257 fib6_info_release(f6i);
1258 return NULL;
1259 }
1260 ip6_rt_copy_init(pcpu_rt, res);
1261 pcpu_rt->rt6i_flags |= RTF_PCPU;
1262 return pcpu_rt;
1263}
1264
1265
1266static struct rt6_info *rt6_get_pcpu_route(const struct fib6_result *res)
1267{
1268 struct rt6_info *pcpu_rt, **p;
1269
1270 p = this_cpu_ptr(res->f6i->rt6i_pcpu);
1271 pcpu_rt = *p;
1272
1273 if (pcpu_rt)
1274 ip6_hold_safe(NULL, &pcpu_rt);
1275
1276 return pcpu_rt;
1277}
1278
1279static struct rt6_info *rt6_make_pcpu_route(struct net *net,
1280 const struct fib6_result *res)
1281{
1282 struct rt6_info *pcpu_rt, *prev, **p;
1283
1284 pcpu_rt = ip6_rt_pcpu_alloc(res);
1285 if (!pcpu_rt) {
1286 dst_hold(&net->ipv6.ip6_null_entry->dst);
1287 return net->ipv6.ip6_null_entry;
1288 }
1289
1290 dst_hold(&pcpu_rt->dst);
1291 p = this_cpu_ptr(res->f6i->rt6i_pcpu);
1292 prev = cmpxchg(p, NULL, pcpu_rt);
1293 BUG_ON(prev);
1294
1295 if (res->f6i->fib6_destroying) {
1296 struct fib6_info *from;
1297
1298 from = xchg((__force struct fib6_info **)&pcpu_rt->from, NULL);
1299 fib6_info_release(from);
1300 }
1301
1302 return pcpu_rt;
1303}
1304
1305
1306
1307static DEFINE_SPINLOCK(rt6_exception_lock);
1308
1309
1310
1311
1312static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
1313 struct rt6_exception *rt6_ex)
1314{
1315 struct fib6_info *from;
1316 struct net *net;
1317
1318 if (!bucket || !rt6_ex)
1319 return;
1320
1321 net = dev_net(rt6_ex->rt6i->dst.dev);
1322 net->ipv6.rt6_stats->fib_rt_cache--;
1323
1324
1325
1326
1327 from = xchg((__force struct fib6_info **)&rt6_ex->rt6i->from, NULL);
1328 fib6_info_release(from);
1329 dst_dev_put(&rt6_ex->rt6i->dst);
1330
1331 hlist_del_rcu(&rt6_ex->hlist);
1332 dst_release(&rt6_ex->rt6i->dst);
1333 kfree_rcu(rt6_ex, rcu);
1334 WARN_ON_ONCE(!bucket->depth);
1335 bucket->depth--;
1336}
1337
1338
1339
1340
1341static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
1342{
1343 struct rt6_exception *rt6_ex, *oldest = NULL;
1344
1345 if (!bucket)
1346 return;
1347
1348 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1349 if (!oldest || time_before(rt6_ex->stamp, oldest->stamp))
1350 oldest = rt6_ex;
1351 }
1352 rt6_remove_exception(bucket, oldest);
1353}
1354
1355static u32 rt6_exception_hash(const struct in6_addr *dst,
1356 const struct in6_addr *src)
1357{
1358 static u32 seed __read_mostly;
1359 u32 val;
1360
1361 net_get_random_once(&seed, sizeof(seed));
1362 val = jhash(dst, sizeof(*dst), seed);
1363
1364#ifdef CONFIG_IPV6_SUBTREES
1365 if (src)
1366 val = jhash(src, sizeof(*src), val);
1367#endif
1368 return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
1369}
1370
1371
1372
1373
1374
1375
1376static struct rt6_exception *
1377__rt6_find_exception_spinlock(struct rt6_exception_bucket **bucket,
1378 const struct in6_addr *daddr,
1379 const struct in6_addr *saddr)
1380{
1381 struct rt6_exception *rt6_ex;
1382 u32 hval;
1383
1384 if (!(*bucket) || !daddr)
1385 return NULL;
1386
1387 hval = rt6_exception_hash(daddr, saddr);
1388 *bucket += hval;
1389
1390 hlist_for_each_entry(rt6_ex, &(*bucket)->chain, hlist) {
1391 struct rt6_info *rt6 = rt6_ex->rt6i;
1392 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1393
1394#ifdef CONFIG_IPV6_SUBTREES
1395 if (matched && saddr)
1396 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1397#endif
1398 if (matched)
1399 return rt6_ex;
1400 }
1401 return NULL;
1402}
1403
1404
1405
1406
1407
1408
1409static struct rt6_exception *
1410__rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
1411 const struct in6_addr *daddr,
1412 const struct in6_addr *saddr)
1413{
1414 struct rt6_exception *rt6_ex;
1415 u32 hval;
1416
1417 WARN_ON_ONCE(!rcu_read_lock_held());
1418
1419 if (!(*bucket) || !daddr)
1420 return NULL;
1421
1422 hval = rt6_exception_hash(daddr, saddr);
1423 *bucket += hval;
1424
1425 hlist_for_each_entry_rcu(rt6_ex, &(*bucket)->chain, hlist) {
1426 struct rt6_info *rt6 = rt6_ex->rt6i;
1427 bool matched = ipv6_addr_equal(daddr, &rt6->rt6i_dst.addr);
1428
1429#ifdef CONFIG_IPV6_SUBTREES
1430 if (matched && saddr)
1431 matched = ipv6_addr_equal(saddr, &rt6->rt6i_src.addr);
1432#endif
1433 if (matched)
1434 return rt6_ex;
1435 }
1436 return NULL;
1437}
1438
1439static unsigned int fib6_mtu(const struct fib6_result *res)
1440{
1441 const struct fib6_nh *nh = res->nh;
1442 unsigned int mtu;
1443
1444 if (res->f6i->fib6_pmtu) {
1445 mtu = res->f6i->fib6_pmtu;
1446 } else {
1447 struct net_device *dev = nh->fib_nh_dev;
1448 struct inet6_dev *idev;
1449
1450 rcu_read_lock();
1451 idev = __in6_dev_get(dev);
1452 mtu = idev->cnf.mtu6;
1453 rcu_read_unlock();
1454 }
1455
1456 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
1457
1458 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
1459}
1460
1461static int rt6_insert_exception(struct rt6_info *nrt,
1462 const struct fib6_result *res)
1463{
1464 struct net *net = dev_net(nrt->dst.dev);
1465 struct rt6_exception_bucket *bucket;
1466 struct in6_addr *src_key = NULL;
1467 struct rt6_exception *rt6_ex;
1468 struct fib6_info *f6i = res->f6i;
1469 int err = 0;
1470
1471 spin_lock_bh(&rt6_exception_lock);
1472
1473 if (f6i->exception_bucket_flushed) {
1474 err = -EINVAL;
1475 goto out;
1476 }
1477
1478 bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket,
1479 lockdep_is_held(&rt6_exception_lock));
1480 if (!bucket) {
1481 bucket = kcalloc(FIB6_EXCEPTION_BUCKET_SIZE, sizeof(*bucket),
1482 GFP_ATOMIC);
1483 if (!bucket) {
1484 err = -ENOMEM;
1485 goto out;
1486 }
1487 rcu_assign_pointer(f6i->rt6i_exception_bucket, bucket);
1488 }
1489
1490#ifdef CONFIG_IPV6_SUBTREES
1491
1492
1493
1494
1495
1496
1497 if (f6i->fib6_src.plen)
1498 src_key = &nrt->rt6i_src.addr;
1499#endif
1500
1501
1502
1503
1504 if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
1505 err = -EINVAL;
1506 goto out;
1507 }
1508
1509 rt6_ex = __rt6_find_exception_spinlock(&bucket, &nrt->rt6i_dst.addr,
1510 src_key);
1511 if (rt6_ex)
1512 rt6_remove_exception(bucket, rt6_ex);
1513
1514 rt6_ex = kzalloc(sizeof(*rt6_ex), GFP_ATOMIC);
1515 if (!rt6_ex) {
1516 err = -ENOMEM;
1517 goto out;
1518 }
1519 rt6_ex->rt6i = nrt;
1520 rt6_ex->stamp = jiffies;
1521 hlist_add_head_rcu(&rt6_ex->hlist, &bucket->chain);
1522 bucket->depth++;
1523 net->ipv6.rt6_stats->fib_rt_cache++;
1524
1525 if (bucket->depth > FIB6_MAX_DEPTH)
1526 rt6_exception_remove_oldest(bucket);
1527
1528out:
1529 spin_unlock_bh(&rt6_exception_lock);
1530
1531
1532 if (!err) {
1533 spin_lock_bh(&f6i->fib6_table->tb6_lock);
1534 fib6_update_sernum(net, f6i);
1535 spin_unlock_bh(&f6i->fib6_table->tb6_lock);
1536 fib6_force_start_gc(net);
1537 }
1538
1539 return err;
1540}
1541
1542void rt6_flush_exceptions(struct fib6_info *rt)
1543{
1544 struct rt6_exception_bucket *bucket;
1545 struct rt6_exception *rt6_ex;
1546 struct hlist_node *tmp;
1547 int i;
1548
1549 spin_lock_bh(&rt6_exception_lock);
1550
1551 rt->exception_bucket_flushed = 1;
1552
1553 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1554 lockdep_is_held(&rt6_exception_lock));
1555 if (!bucket)
1556 goto out;
1557
1558 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1559 hlist_for_each_entry_safe(rt6_ex, tmp, &bucket->chain, hlist)
1560 rt6_remove_exception(bucket, rt6_ex);
1561 WARN_ON_ONCE(bucket->depth);
1562 bucket++;
1563 }
1564
1565out:
1566 spin_unlock_bh(&rt6_exception_lock);
1567}
1568
1569
1570
1571
1572static struct rt6_info *rt6_find_cached_rt(const struct fib6_result *res,
1573 const struct in6_addr *daddr,
1574 const struct in6_addr *saddr)
1575{
1576 const struct in6_addr *src_key = NULL;
1577 struct rt6_exception_bucket *bucket;
1578 struct rt6_exception *rt6_ex;
1579 struct rt6_info *ret = NULL;
1580
1581#ifdef CONFIG_IPV6_SUBTREES
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593 if (res->f6i->fib6_src.plen)
1594 src_key = saddr;
1595find_ex:
1596#endif
1597 bucket = rcu_dereference(res->f6i->rt6i_exception_bucket);
1598 rt6_ex = __rt6_find_exception_rcu(&bucket, daddr, src_key);
1599
1600 if (rt6_ex && !rt6_check_expired(rt6_ex->rt6i))
1601 ret = rt6_ex->rt6i;
1602
1603#ifdef CONFIG_IPV6_SUBTREES
1604
1605 if (!ret && src_key && src_key != &res->f6i->fib6_src.addr) {
1606 src_key = &res->f6i->fib6_src.addr;
1607 goto find_ex;
1608 }
1609#endif
1610
1611 return ret;
1612}
1613
1614
1615static int rt6_remove_exception_rt(struct rt6_info *rt)
1616{
1617 struct rt6_exception_bucket *bucket;
1618 struct in6_addr *src_key = NULL;
1619 struct rt6_exception *rt6_ex;
1620 struct fib6_info *from;
1621 int err;
1622
1623 from = rcu_dereference(rt->from);
1624 if (!from ||
1625 !(rt->rt6i_flags & RTF_CACHE))
1626 return -EINVAL;
1627
1628 if (!rcu_access_pointer(from->rt6i_exception_bucket))
1629 return -ENOENT;
1630
1631 spin_lock_bh(&rt6_exception_lock);
1632 bucket = rcu_dereference_protected(from->rt6i_exception_bucket,
1633 lockdep_is_held(&rt6_exception_lock));
1634#ifdef CONFIG_IPV6_SUBTREES
1635
1636
1637
1638
1639
1640
1641 if (from->fib6_src.plen)
1642 src_key = &rt->rt6i_src.addr;
1643#endif
1644 rt6_ex = __rt6_find_exception_spinlock(&bucket,
1645 &rt->rt6i_dst.addr,
1646 src_key);
1647 if (rt6_ex) {
1648 rt6_remove_exception(bucket, rt6_ex);
1649 err = 0;
1650 } else {
1651 err = -ENOENT;
1652 }
1653
1654 spin_unlock_bh(&rt6_exception_lock);
1655 return err;
1656}
1657
1658
1659
1660
1661static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
1662{
1663 struct rt6_exception_bucket *bucket;
1664 struct in6_addr *src_key = NULL;
1665 struct rt6_exception *rt6_ex;
1666 struct fib6_info *from;
1667
1668 rcu_read_lock();
1669 from = rcu_dereference(rt->from);
1670 if (!from || !(rt->rt6i_flags & RTF_CACHE))
1671 goto unlock;
1672
1673 bucket = rcu_dereference(from->rt6i_exception_bucket);
1674
1675#ifdef CONFIG_IPV6_SUBTREES
1676
1677
1678
1679
1680
1681
1682 if (from->fib6_src.plen)
1683 src_key = &rt->rt6i_src.addr;
1684#endif
1685 rt6_ex = __rt6_find_exception_rcu(&bucket,
1686 &rt->rt6i_dst.addr,
1687 src_key);
1688 if (rt6_ex)
1689 rt6_ex->stamp = jiffies;
1690
1691unlock:
1692 rcu_read_unlock();
1693}
1694
1695static bool rt6_mtu_change_route_allowed(struct inet6_dev *idev,
1696 struct rt6_info *rt, int mtu)
1697{
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708 if (dst_mtu(&rt->dst) >= mtu)
1709 return true;
1710
1711 if (dst_mtu(&rt->dst) == idev->cnf.mtu6)
1712 return true;
1713
1714 return false;
1715}
1716
1717static void rt6_exceptions_update_pmtu(struct inet6_dev *idev,
1718 struct fib6_info *rt, int mtu)
1719{
1720 struct rt6_exception_bucket *bucket;
1721 struct rt6_exception *rt6_ex;
1722 int i;
1723
1724 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1725 lockdep_is_held(&rt6_exception_lock));
1726
1727 if (!bucket)
1728 return;
1729
1730 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1731 hlist_for_each_entry(rt6_ex, &bucket->chain, hlist) {
1732 struct rt6_info *entry = rt6_ex->rt6i;
1733
1734
1735
1736
1737
1738 if (dst_metric_raw(&entry->dst, RTAX_MTU) &&
1739 rt6_mtu_change_route_allowed(idev, entry, mtu))
1740 dst_metric_set(&entry->dst, RTAX_MTU, mtu);
1741 }
1742 bucket++;
1743 }
1744}
1745
1746#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
1747
1748static void rt6_exceptions_clean_tohost(struct fib6_info *rt,
1749 struct in6_addr *gateway)
1750{
1751 struct rt6_exception_bucket *bucket;
1752 struct rt6_exception *rt6_ex;
1753 struct hlist_node *tmp;
1754 int i;
1755
1756 if (!rcu_access_pointer(rt->rt6i_exception_bucket))
1757 return;
1758
1759 spin_lock_bh(&rt6_exception_lock);
1760 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1761 lockdep_is_held(&rt6_exception_lock));
1762
1763 if (bucket) {
1764 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1765 hlist_for_each_entry_safe(rt6_ex, tmp,
1766 &bucket->chain, hlist) {
1767 struct rt6_info *entry = rt6_ex->rt6i;
1768
1769 if ((entry->rt6i_flags & RTF_CACHE_GATEWAY) ==
1770 RTF_CACHE_GATEWAY &&
1771 ipv6_addr_equal(gateway,
1772 &entry->rt6i_gateway)) {
1773 rt6_remove_exception(bucket, rt6_ex);
1774 }
1775 }
1776 bucket++;
1777 }
1778 }
1779
1780 spin_unlock_bh(&rt6_exception_lock);
1781}
1782
1783static void rt6_age_examine_exception(struct rt6_exception_bucket *bucket,
1784 struct rt6_exception *rt6_ex,
1785 struct fib6_gc_args *gc_args,
1786 unsigned long now)
1787{
1788 struct rt6_info *rt = rt6_ex->rt6i;
1789
1790
1791
1792
1793
1794
1795
1796 if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1797 if (time_after_eq(now, rt->dst.lastuse + gc_args->timeout)) {
1798 RT6_TRACE("aging clone %p\n", rt);
1799 rt6_remove_exception(bucket, rt6_ex);
1800 return;
1801 }
1802 } else if (time_after(jiffies, rt->dst.expires)) {
1803 RT6_TRACE("purging expired route %p\n", rt);
1804 rt6_remove_exception(bucket, rt6_ex);
1805 return;
1806 }
1807
1808 if (rt->rt6i_flags & RTF_GATEWAY) {
1809 struct neighbour *neigh;
1810 __u8 neigh_flags = 0;
1811
1812 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
1813 if (neigh)
1814 neigh_flags = neigh->flags;
1815
1816 if (!(neigh_flags & NTF_ROUTER)) {
1817 RT6_TRACE("purging route %p via non-router but gateway\n",
1818 rt);
1819 rt6_remove_exception(bucket, rt6_ex);
1820 return;
1821 }
1822 }
1823
1824 gc_args->more++;
1825}
1826
1827void rt6_age_exceptions(struct fib6_info *rt,
1828 struct fib6_gc_args *gc_args,
1829 unsigned long now)
1830{
1831 struct rt6_exception_bucket *bucket;
1832 struct rt6_exception *rt6_ex;
1833 struct hlist_node *tmp;
1834 int i;
1835
1836 if (!rcu_access_pointer(rt->rt6i_exception_bucket))
1837 return;
1838
1839 rcu_read_lock_bh();
1840 spin_lock(&rt6_exception_lock);
1841 bucket = rcu_dereference_protected(rt->rt6i_exception_bucket,
1842 lockdep_is_held(&rt6_exception_lock));
1843
1844 if (bucket) {
1845 for (i = 0; i < FIB6_EXCEPTION_BUCKET_SIZE; i++) {
1846 hlist_for_each_entry_safe(rt6_ex, tmp,
1847 &bucket->chain, hlist) {
1848 rt6_age_examine_exception(bucket, rt6_ex,
1849 gc_args, now);
1850 }
1851 bucket++;
1852 }
1853 }
1854 spin_unlock(&rt6_exception_lock);
1855 rcu_read_unlock_bh();
1856}
1857
1858
1859int fib6_table_lookup(struct net *net, struct fib6_table *table, int oif,
1860 struct flowi6 *fl6, struct fib6_result *res, int strict)
1861{
1862 struct fib6_node *fn, *saved_fn;
1863
1864 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1865 saved_fn = fn;
1866
1867 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
1868 oif = 0;
1869
1870redo_rt6_select:
1871 rt6_select(net, fn, oif, res, strict);
1872 if (res->f6i == net->ipv6.fib6_null_entry) {
1873 fn = fib6_backtrack(fn, &fl6->saddr);
1874 if (fn)
1875 goto redo_rt6_select;
1876 else if (strict & RT6_LOOKUP_F_REACHABLE) {
1877
1878 strict &= ~RT6_LOOKUP_F_REACHABLE;
1879 fn = saved_fn;
1880 goto redo_rt6_select;
1881 }
1882 }
1883
1884 trace_fib6_table_lookup(net, res, table, fl6);
1885
1886 return 0;
1887}
1888
1889struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
1890 int oif, struct flowi6 *fl6,
1891 const struct sk_buff *skb, int flags)
1892{
1893 struct fib6_result res = {};
1894 struct rt6_info *rt;
1895 int strict = 0;
1896
1897 strict |= flags & RT6_LOOKUP_F_IFACE;
1898 strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
1899 if (net->ipv6.devconf_all->forwarding == 0)
1900 strict |= RT6_LOOKUP_F_REACHABLE;
1901
1902 rcu_read_lock();
1903
1904 fib6_table_lookup(net, table, oif, fl6, &res, strict);
1905 if (res.f6i == net->ipv6.fib6_null_entry) {
1906 rt = net->ipv6.ip6_null_entry;
1907 rcu_read_unlock();
1908 dst_hold(&rt->dst);
1909 return rt;
1910 }
1911
1912 fib6_select_path(net, &res, fl6, oif, false, skb, strict);
1913
1914
1915 rt = rt6_find_cached_rt(&res, &fl6->daddr, &fl6->saddr);
1916 if (rt) {
1917 if (ip6_hold_safe(net, &rt))
1918 dst_use_noref(&rt->dst, jiffies);
1919
1920 rcu_read_unlock();
1921 return rt;
1922 } else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
1923 !res.nh->fib_nh_gw_family)) {
1924
1925
1926
1927
1928
1929 struct rt6_info *uncached_rt;
1930
1931 uncached_rt = ip6_rt_cache_alloc(&res, &fl6->daddr, NULL);
1932
1933 rcu_read_unlock();
1934
1935 if (uncached_rt) {
1936
1937
1938
1939 rt6_uncached_list_add(uncached_rt);
1940 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
1941 } else {
1942 uncached_rt = net->ipv6.ip6_null_entry;
1943 dst_hold(&uncached_rt->dst);
1944 }
1945
1946 return uncached_rt;
1947 } else {
1948
1949
1950 struct rt6_info *pcpu_rt;
1951
1952 local_bh_disable();
1953 pcpu_rt = rt6_get_pcpu_route(&res);
1954
1955 if (!pcpu_rt)
1956 pcpu_rt = rt6_make_pcpu_route(net, &res);
1957
1958 local_bh_enable();
1959 rcu_read_unlock();
1960
1961 return pcpu_rt;
1962 }
1963}
1964EXPORT_SYMBOL_GPL(ip6_pol_route);
1965
1966static struct rt6_info *ip6_pol_route_input(struct net *net,
1967 struct fib6_table *table,
1968 struct flowi6 *fl6,
1969 const struct sk_buff *skb,
1970 int flags)
1971{
1972 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, skb, flags);
1973}
1974
1975struct dst_entry *ip6_route_input_lookup(struct net *net,
1976 struct net_device *dev,
1977 struct flowi6 *fl6,
1978 const struct sk_buff *skb,
1979 int flags)
1980{
1981 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1982 flags |= RT6_LOOKUP_F_IFACE;
1983
1984 return fib6_rule_lookup(net, fl6, skb, flags, ip6_pol_route_input);
1985}
1986EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
1987
1988static void ip6_multipath_l3_keys(const struct sk_buff *skb,
1989 struct flow_keys *keys,
1990 struct flow_keys *flkeys)
1991{
1992 const struct ipv6hdr *outer_iph = ipv6_hdr(skb);
1993 const struct ipv6hdr *key_iph = outer_iph;
1994 struct flow_keys *_flkeys = flkeys;
1995 const struct ipv6hdr *inner_iph;
1996 const struct icmp6hdr *icmph;
1997 struct ipv6hdr _inner_iph;
1998 struct icmp6hdr _icmph;
1999
2000 if (likely(outer_iph->nexthdr != IPPROTO_ICMPV6))
2001 goto out;
2002
2003 icmph = skb_header_pointer(skb, skb_transport_offset(skb),
2004 sizeof(_icmph), &_icmph);
2005 if (!icmph)
2006 goto out;
2007
2008 if (icmph->icmp6_type != ICMPV6_DEST_UNREACH &&
2009 icmph->icmp6_type != ICMPV6_PKT_TOOBIG &&
2010 icmph->icmp6_type != ICMPV6_TIME_EXCEED &&
2011 icmph->icmp6_type != ICMPV6_PARAMPROB)
2012 goto out;
2013
2014 inner_iph = skb_header_pointer(skb,
2015 skb_transport_offset(skb) + sizeof(*icmph),
2016 sizeof(_inner_iph), &_inner_iph);
2017 if (!inner_iph)
2018 goto out;
2019
2020 key_iph = inner_iph;
2021 _flkeys = NULL;
2022out:
2023 if (_flkeys) {
2024 keys->addrs.v6addrs.src = _flkeys->addrs.v6addrs.src;
2025 keys->addrs.v6addrs.dst = _flkeys->addrs.v6addrs.dst;
2026 keys->tags.flow_label = _flkeys->tags.flow_label;
2027 keys->basic.ip_proto = _flkeys->basic.ip_proto;
2028 } else {
2029 keys->addrs.v6addrs.src = key_iph->saddr;
2030 keys->addrs.v6addrs.dst = key_iph->daddr;
2031 keys->tags.flow_label = ip6_flowlabel(key_iph);
2032 keys->basic.ip_proto = key_iph->nexthdr;
2033 }
2034}
2035
2036
2037u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
2038 const struct sk_buff *skb, struct flow_keys *flkeys)
2039{
2040 struct flow_keys hash_keys;
2041 u32 mhash;
2042
2043 switch (ip6_multipath_hash_policy(net)) {
2044 case 0:
2045 memset(&hash_keys, 0, sizeof(hash_keys));
2046 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2047 if (skb) {
2048 ip6_multipath_l3_keys(skb, &hash_keys, flkeys);
2049 } else {
2050 hash_keys.addrs.v6addrs.src = fl6->saddr;
2051 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2052 hash_keys.tags.flow_label = (__force u32)flowi6_get_flowlabel(fl6);
2053 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2054 }
2055 break;
2056 case 1:
2057 if (skb) {
2058 unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
2059 struct flow_keys keys;
2060
2061
2062 if (skb->l4_hash)
2063 return skb_get_hash_raw(skb) >> 1;
2064
2065 memset(&hash_keys, 0, sizeof(hash_keys));
2066
2067 if (!flkeys) {
2068 skb_flow_dissect_flow_keys(skb, &keys, flag);
2069 flkeys = &keys;
2070 }
2071 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2072 hash_keys.addrs.v6addrs.src = flkeys->addrs.v6addrs.src;
2073 hash_keys.addrs.v6addrs.dst = flkeys->addrs.v6addrs.dst;
2074 hash_keys.ports.src = flkeys->ports.src;
2075 hash_keys.ports.dst = flkeys->ports.dst;
2076 hash_keys.basic.ip_proto = flkeys->basic.ip_proto;
2077 } else {
2078 memset(&hash_keys, 0, sizeof(hash_keys));
2079 hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
2080 hash_keys.addrs.v6addrs.src = fl6->saddr;
2081 hash_keys.addrs.v6addrs.dst = fl6->daddr;
2082 hash_keys.ports.src = fl6->fl6_sport;
2083 hash_keys.ports.dst = fl6->fl6_dport;
2084 hash_keys.basic.ip_proto = fl6->flowi6_proto;
2085 }
2086 break;
2087 }
2088 mhash = flow_hash_from_keys(&hash_keys);
2089
2090 return mhash >> 1;
2091}
2092
2093void ip6_route_input(struct sk_buff *skb)
2094{
2095 const struct ipv6hdr *iph = ipv6_hdr(skb);
2096 struct net *net = dev_net(skb->dev);
2097 int flags = RT6_LOOKUP_F_HAS_SADDR;
2098 struct ip_tunnel_info *tun_info;
2099 struct flowi6 fl6 = {
2100 .flowi6_iif = skb->dev->ifindex,
2101 .daddr = iph->daddr,
2102 .saddr = iph->saddr,
2103 .flowlabel = ip6_flowinfo(iph),
2104 .flowi6_mark = skb->mark,
2105 .flowi6_proto = iph->nexthdr,
2106 };
2107 struct flow_keys *flkeys = NULL, _flkeys;
2108
2109 tun_info = skb_tunnel_info(skb);
2110 if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
2111 fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
2112
2113 if (fib6_rules_early_flow_dissect(net, skb, &fl6, &_flkeys))
2114 flkeys = &_flkeys;
2115
2116 if (unlikely(fl6.flowi6_proto == IPPROTO_ICMPV6))
2117 fl6.mp_hash = rt6_multipath_hash(net, &fl6, skb, flkeys);
2118 skb_dst_drop(skb);
2119 skb_dst_set(skb,
2120 ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags));
2121}
2122
2123static struct rt6_info *ip6_pol_route_output(struct net *net,
2124 struct fib6_table *table,
2125 struct flowi6 *fl6,
2126 const struct sk_buff *skb,
2127 int flags)
2128{
2129 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, skb, flags);
2130}
2131
2132struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
2133 struct flowi6 *fl6, int flags)
2134{
2135 bool any_src;
2136
2137 if (ipv6_addr_type(&fl6->daddr) &
2138 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL)) {
2139 struct dst_entry *dst;
2140
2141 dst = l3mdev_link_scope_lookup(net, fl6);
2142 if (dst)
2143 return dst;
2144 }
2145
2146 fl6->flowi6_iif = LOOPBACK_IFINDEX;
2147
2148 any_src = ipv6_addr_any(&fl6->saddr);
2149 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
2150 (fl6->flowi6_oif && any_src))
2151 flags |= RT6_LOOKUP_F_IFACE;
2152
2153 if (!any_src)
2154 flags |= RT6_LOOKUP_F_HAS_SADDR;
2155 else if (sk)
2156 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
2157
2158 return fib6_rule_lookup(net, fl6, NULL, flags, ip6_pol_route_output);
2159}
2160EXPORT_SYMBOL_GPL(ip6_route_output_flags);
2161
2162struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
2163{
2164 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
2165 struct net_device *loopback_dev = net->loopback_dev;
2166 struct dst_entry *new = NULL;
2167
2168 rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
2169 DST_OBSOLETE_DEAD, 0);
2170 if (rt) {
2171 rt6_info_init(rt);
2172 atomic_inc(&net->ipv6.rt6_stats->fib_rt_alloc);
2173
2174 new = &rt->dst;
2175 new->__use = 1;
2176 new->input = dst_discard;
2177 new->output = dst_discard_out;
2178
2179 dst_copy_metrics(new, &ort->dst);
2180
2181 rt->rt6i_idev = in6_dev_get(loopback_dev);
2182 rt->rt6i_gateway = ort->rt6i_gateway;
2183 rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
2184
2185 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
2186#ifdef CONFIG_IPV6_SUBTREES
2187 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
2188#endif
2189 }
2190
2191 dst_release(dst_orig);
2192 return new ? new : ERR_PTR(-ENOMEM);
2193}
2194
2195
2196
2197
2198
2199static bool fib6_check(struct fib6_info *f6i, u32 cookie)
2200{
2201 u32 rt_cookie = 0;
2202
2203 if (!fib6_get_cookie_safe(f6i, &rt_cookie) || rt_cookie != cookie)
2204 return false;
2205
2206 if (fib6_check_expired(f6i))
2207 return false;
2208
2209 return true;
2210}
2211
2212static struct dst_entry *rt6_check(struct rt6_info *rt,
2213 struct fib6_info *from,
2214 u32 cookie)
2215{
2216 u32 rt_cookie = 0;
2217
2218 if ((from && !fib6_get_cookie_safe(from, &rt_cookie)) ||
2219 rt_cookie != cookie)
2220 return NULL;
2221
2222 if (rt6_check_expired(rt))
2223 return NULL;
2224
2225 return &rt->dst;
2226}
2227
2228static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt,
2229 struct fib6_info *from,
2230 u32 cookie)
2231{
2232 if (!__rt6_check_expired(rt) &&
2233 rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
2234 fib6_check(from, cookie))
2235 return &rt->dst;
2236 else
2237 return NULL;
2238}
2239
2240static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
2241{
2242 struct dst_entry *dst_ret;
2243 struct fib6_info *from;
2244 struct rt6_info *rt;
2245
2246 rt = container_of(dst, struct rt6_info, dst);
2247
2248 rcu_read_lock();
2249
2250
2251
2252
2253
2254
2255 from = rcu_dereference(rt->from);
2256
2257 if (from && (rt->rt6i_flags & RTF_PCPU ||
2258 unlikely(!list_empty(&rt->rt6i_uncached))))
2259 dst_ret = rt6_dst_from_check(rt, from, cookie);
2260 else
2261 dst_ret = rt6_check(rt, from, cookie);
2262
2263 rcu_read_unlock();
2264
2265 return dst_ret;
2266}
2267
2268static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
2269{
2270 struct rt6_info *rt = (struct rt6_info *) dst;
2271
2272 if (rt) {
2273 if (rt->rt6i_flags & RTF_CACHE) {
2274 rcu_read_lock();
2275 if (rt6_check_expired(rt)) {
2276 rt6_remove_exception_rt(rt);
2277 dst = NULL;
2278 }
2279 rcu_read_unlock();
2280 } else {
2281 dst_release(dst);
2282 dst = NULL;
2283 }
2284 }
2285 return dst;
2286}
2287
2288static void ip6_link_failure(struct sk_buff *skb)
2289{
2290 struct rt6_info *rt;
2291
2292 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
2293
2294 rt = (struct rt6_info *) skb_dst(skb);
2295 if (rt) {
2296 rcu_read_lock();
2297 if (rt->rt6i_flags & RTF_CACHE) {
2298 rt6_remove_exception_rt(rt);
2299 } else {
2300 struct fib6_info *from;
2301 struct fib6_node *fn;
2302
2303 from = rcu_dereference(rt->from);
2304 if (from) {
2305 fn = rcu_dereference(from->fib6_node);
2306 if (fn && (rt->rt6i_flags & RTF_DEFAULT))
2307 fn->fn_sernum = -1;
2308 }
2309 }
2310 rcu_read_unlock();
2311 }
2312}
2313
2314static void rt6_update_expires(struct rt6_info *rt0, int timeout)
2315{
2316 if (!(rt0->rt6i_flags & RTF_EXPIRES)) {
2317 struct fib6_info *from;
2318
2319 rcu_read_lock();
2320 from = rcu_dereference(rt0->from);
2321 if (from)
2322 rt0->dst.expires = from->expires;
2323 rcu_read_unlock();
2324 }
2325
2326 dst_set_expires(&rt0->dst, timeout);
2327 rt0->rt6i_flags |= RTF_EXPIRES;
2328}
2329
2330static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
2331{
2332 struct net *net = dev_net(rt->dst.dev);
2333
2334 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
2335 rt->rt6i_flags |= RTF_MODIFIED;
2336 rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
2337}
2338
2339static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
2340{
2341 return !(rt->rt6i_flags & RTF_CACHE) &&
2342 (rt->rt6i_flags & RTF_PCPU || rcu_access_pointer(rt->from));
2343}
2344
2345static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
2346 const struct ipv6hdr *iph, u32 mtu)
2347{
2348 const struct in6_addr *daddr, *saddr;
2349 struct rt6_info *rt6 = (struct rt6_info *)dst;
2350
2351 if (dst_metric_locked(dst, RTAX_MTU))
2352 return;
2353
2354 if (iph) {
2355 daddr = &iph->daddr;
2356 saddr = &iph->saddr;
2357 } else if (sk) {
2358 daddr = &sk->sk_v6_daddr;
2359 saddr = &inet6_sk(sk)->saddr;
2360 } else {
2361 daddr = NULL;
2362 saddr = NULL;
2363 }
2364 dst_confirm_neigh(dst, daddr);
2365 mtu = max_t(u32, mtu, IPV6_MIN_MTU);
2366 if (mtu >= dst_mtu(dst))
2367 return;
2368
2369 if (!rt6_cache_allowed_for_pmtu(rt6)) {
2370 rt6_do_update_pmtu(rt6, mtu);
2371
2372 if (rt6->rt6i_flags & RTF_CACHE)
2373 rt6_update_exception_stamp_rt(rt6);
2374 } else if (daddr) {
2375 struct fib6_result res = {};
2376 struct rt6_info *nrt6;
2377
2378 rcu_read_lock();
2379 res.f6i = rcu_dereference(rt6->from);
2380 if (!res.f6i) {
2381 rcu_read_unlock();
2382 return;
2383 }
2384 res.nh = &res.f6i->fib6_nh;
2385 res.fib6_flags = res.f6i->fib6_flags;
2386 res.fib6_type = res.f6i->fib6_type;
2387
2388 nrt6 = ip6_rt_cache_alloc(&res, daddr, saddr);
2389 if (nrt6) {
2390 rt6_do_update_pmtu(nrt6, mtu);
2391 if (rt6_insert_exception(nrt6, &res))
2392 dst_release_immediate(&nrt6->dst);
2393 }
2394 rcu_read_unlock();
2395 }
2396}
2397
2398static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
2399 struct sk_buff *skb, u32 mtu)
2400{
2401 __ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
2402}
2403
2404void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
2405 int oif, u32 mark, kuid_t uid)
2406{
2407 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2408 struct dst_entry *dst;
2409 struct flowi6 fl6 = {
2410 .flowi6_oif = oif,
2411 .flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark),
2412 .daddr = iph->daddr,
2413 .saddr = iph->saddr,
2414 .flowlabel = ip6_flowinfo(iph),
2415 .flowi6_uid = uid,
2416 };
2417
2418 dst = ip6_route_output(net, NULL, &fl6);
2419 if (!dst->error)
2420 __ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
2421 dst_release(dst);
2422}
2423EXPORT_SYMBOL_GPL(ip6_update_pmtu);
2424
2425void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
2426{
2427 int oif = sk->sk_bound_dev_if;
2428 struct dst_entry *dst;
2429
2430 if (!oif && skb->dev)
2431 oif = l3mdev_master_ifindex(skb->dev);
2432
2433 ip6_update_pmtu(skb, sock_net(sk), mtu, oif, sk->sk_mark, sk->sk_uid);
2434
2435 dst = __sk_dst_get(sk);
2436 if (!dst || !dst->obsolete ||
2437 dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
2438 return;
2439
2440 bh_lock_sock(sk);
2441 if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
2442 ip6_datagram_dst_update(sk, false);
2443 bh_unlock_sock(sk);
2444}
2445EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
2446
2447void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
2448 const struct flowi6 *fl6)
2449{
2450#ifdef CONFIG_IPV6_SUBTREES
2451 struct ipv6_pinfo *np = inet6_sk(sk);
2452#endif
2453
2454 ip6_dst_store(sk, dst,
2455 ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
2456 &sk->sk_v6_daddr : NULL,
2457#ifdef CONFIG_IPV6_SUBTREES
2458 ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
2459 &np->saddr :
2460#endif
2461 NULL);
2462}
2463
2464static bool ip6_redirect_nh_match(const struct fib6_result *res,
2465 struct flowi6 *fl6,
2466 const struct in6_addr *gw,
2467 struct rt6_info **ret)
2468{
2469 const struct fib6_nh *nh = res->nh;
2470
2471 if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
2472 fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
2473 return false;
2474
2475
2476
2477
2478
2479
2480 if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
2481 struct rt6_info *rt_cache;
2482
2483 rt_cache = rt6_find_cached_rt(res, &fl6->daddr, &fl6->saddr);
2484 if (rt_cache &&
2485 ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
2486 *ret = rt_cache;
2487 return true;
2488 }
2489 return false;
2490 }
2491 return true;
2492}
2493
2494
2495struct ip6rd_flowi {
2496 struct flowi6 fl6;
2497 struct in6_addr gateway;
2498};
2499
2500static struct rt6_info *__ip6_route_redirect(struct net *net,
2501 struct fib6_table *table,
2502 struct flowi6 *fl6,
2503 const struct sk_buff *skb,
2504 int flags)
2505{
2506 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
2507 struct rt6_info *ret = NULL;
2508 struct fib6_result res = {};
2509 struct fib6_info *rt;
2510 struct fib6_node *fn;
2511
2512
2513
2514
2515 if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
2516 fl6->flowi6_oif = skb->dev->ifindex;
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528 rcu_read_lock();
2529 fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
2530restart:
2531 for_each_fib6_node_rt_rcu(fn) {
2532 res.f6i = rt;
2533 res.nh = &rt->fib6_nh;
2534
2535 if (fib6_check_expired(rt))
2536 continue;
2537 if (rt->fib6_flags & RTF_REJECT)
2538 break;
2539 if (ip6_redirect_nh_match(&res, fl6, &rdfl->gateway, &ret))
2540 goto out;
2541 }
2542
2543 if (!rt)
2544 rt = net->ipv6.fib6_null_entry;
2545 else if (rt->fib6_flags & RTF_REJECT) {
2546 ret = net->ipv6.ip6_null_entry;
2547 goto out;
2548 }
2549
2550 if (rt == net->ipv6.fib6_null_entry) {
2551 fn = fib6_backtrack(fn, &fl6->saddr);
2552 if (fn)
2553 goto restart;
2554 }
2555
2556 res.f6i = rt;
2557 res.nh = &rt->fib6_nh;
2558out:
2559 if (ret) {
2560 ip6_hold_safe(net, &ret);
2561 } else {
2562 res.fib6_flags = res.f6i->fib6_flags;
2563 res.fib6_type = res.f6i->fib6_type;
2564 ret = ip6_create_rt_rcu(&res);
2565 }
2566
2567 rcu_read_unlock();
2568
2569 trace_fib6_table_lookup(net, &res, table, fl6);
2570 return ret;
2571};
2572
2573static struct dst_entry *ip6_route_redirect(struct net *net,
2574 const struct flowi6 *fl6,
2575 const struct sk_buff *skb,
2576 const struct in6_addr *gateway)
2577{
2578 int flags = RT6_LOOKUP_F_HAS_SADDR;
2579 struct ip6rd_flowi rdfl;
2580
2581 rdfl.fl6 = *fl6;
2582 rdfl.gateway = *gateway;
2583
2584 return fib6_rule_lookup(net, &rdfl.fl6, skb,
2585 flags, __ip6_route_redirect);
2586}
2587
2588void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
2589 kuid_t uid)
2590{
2591 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
2592 struct dst_entry *dst;
2593 struct flowi6 fl6 = {
2594 .flowi6_iif = LOOPBACK_IFINDEX,
2595 .flowi6_oif = oif,
2596 .flowi6_mark = mark,
2597 .daddr = iph->daddr,
2598 .saddr = iph->saddr,
2599 .flowlabel = ip6_flowinfo(iph),
2600 .flowi6_uid = uid,
2601 };
2602
2603 dst = ip6_route_redirect(net, &fl6, skb, &ipv6_hdr(skb)->saddr);
2604 rt6_do_redirect(dst, NULL, skb);
2605 dst_release(dst);
2606}
2607EXPORT_SYMBOL_GPL(ip6_redirect);
2608
2609void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif)
2610{
2611 const struct ipv6hdr *iph = ipv6_hdr(skb);
2612 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
2613 struct dst_entry *dst;
2614 struct flowi6 fl6 = {
2615 .flowi6_iif = LOOPBACK_IFINDEX,
2616 .flowi6_oif = oif,
2617 .daddr = msg->dest,
2618 .saddr = iph->daddr,
2619 .flowi6_uid = sock_net_uid(net, NULL),
2620 };
2621
2622 dst = ip6_route_redirect(net, &fl6, skb, &iph->saddr);
2623 rt6_do_redirect(dst, NULL, skb);
2624 dst_release(dst);
2625}
2626
2627void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
2628{
2629 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark,
2630 sk->sk_uid);
2631}
2632EXPORT_SYMBOL_GPL(ip6_sk_redirect);
2633
2634static unsigned int ip6_default_advmss(const struct dst_entry *dst)
2635{
2636 struct net_device *dev = dst->dev;
2637 unsigned int mtu = dst_mtu(dst);
2638 struct net *net = dev_net(dev);
2639
2640 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
2641
2642 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
2643 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
2644
2645
2646
2647
2648
2649
2650
2651 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
2652 mtu = IPV6_MAXPLEN;
2653 return mtu;
2654}
2655
2656static unsigned int ip6_mtu(const struct dst_entry *dst)
2657{
2658 struct inet6_dev *idev;
2659 unsigned int mtu;
2660
2661 mtu = dst_metric_raw(dst, RTAX_MTU);
2662 if (mtu)
2663 goto out;
2664
2665 mtu = IPV6_MIN_MTU;
2666
2667 rcu_read_lock();
2668 idev = __in6_dev_get(dst->dev);
2669 if (idev)
2670 mtu = idev->cnf.mtu6;
2671 rcu_read_unlock();
2672
2673out:
2674 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
2675
2676 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
2677}
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687u32 ip6_mtu_from_fib6(const struct fib6_result *res,
2688 const struct in6_addr *daddr,
2689 const struct in6_addr *saddr)
2690{
2691 const struct fib6_nh *nh = res->nh;
2692 struct fib6_info *f6i = res->f6i;
2693 struct inet6_dev *idev;
2694 struct rt6_info *rt;
2695 u32 mtu = 0;
2696
2697 if (unlikely(fib6_metric_locked(f6i, RTAX_MTU))) {
2698 mtu = f6i->fib6_pmtu;
2699 if (mtu)
2700 goto out;
2701 }
2702
2703 rt = rt6_find_cached_rt(res, daddr, saddr);
2704 if (unlikely(rt)) {
2705 mtu = dst_metric_raw(&rt->dst, RTAX_MTU);
2706 } else {
2707 struct net_device *dev = nh->fib_nh_dev;
2708
2709 mtu = IPV6_MIN_MTU;
2710 idev = __in6_dev_get(dev);
2711 if (idev && idev->cnf.mtu6 > mtu)
2712 mtu = idev->cnf.mtu6;
2713 }
2714
2715 mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
2716out:
2717 return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
2718}
2719
2720struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
2721 struct flowi6 *fl6)
2722{
2723 struct dst_entry *dst;
2724 struct rt6_info *rt;
2725 struct inet6_dev *idev = in6_dev_get(dev);
2726 struct net *net = dev_net(dev);
2727
2728 if (unlikely(!idev))
2729 return ERR_PTR(-ENODEV);
2730
2731 rt = ip6_dst_alloc(net, dev, 0);
2732 if (unlikely(!rt)) {
2733 in6_dev_put(idev);
2734 dst = ERR_PTR(-ENOMEM);
2735 goto out;
2736 }
2737
2738 rt->dst.flags |= DST_HOST;
2739 rt->dst.input = ip6_input;
2740 rt->dst.output = ip6_output;
2741 rt->rt6i_gateway = fl6->daddr;
2742 rt->rt6i_dst.addr = fl6->daddr;
2743 rt->rt6i_dst.plen = 128;
2744 rt->rt6i_idev = idev;
2745 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
2746
2747
2748
2749
2750 rt6_uncached_list_add(rt);
2751 atomic_inc(&net->ipv6.rt6_stats->fib_rt_uncache);
2752
2753 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
2754
2755out:
2756 return dst;
2757}
2758
2759static int ip6_dst_gc(struct dst_ops *ops)
2760{
2761 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
2762 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
2763 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
2764 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
2765 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
2766 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
2767 int entries;
2768
2769 entries = dst_entries_get_fast(ops);
2770 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
2771 entries <= rt_max_size)
2772 goto out;
2773
2774 net->ipv6.ip6_rt_gc_expire++;
2775 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
2776 entries = dst_entries_get_slow(ops);
2777 if (entries < ops->gc_thresh)
2778 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
2779out:
2780 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
2781 return entries > rt_max_size;
2782}
2783
2784static struct rt6_info *ip6_nh_lookup_table(struct net *net,
2785 struct fib6_config *cfg,
2786 const struct in6_addr *gw_addr,
2787 u32 tbid, int flags)
2788{
2789 struct flowi6 fl6 = {
2790 .flowi6_oif = cfg->fc_ifindex,
2791 .daddr = *gw_addr,
2792 .saddr = cfg->fc_prefsrc,
2793 };
2794 struct fib6_table *table;
2795 struct rt6_info *rt;
2796
2797 table = fib6_get_table(net, tbid);
2798 if (!table)
2799 return NULL;
2800
2801 if (!ipv6_addr_any(&cfg->fc_prefsrc))
2802 flags |= RT6_LOOKUP_F_HAS_SADDR;
2803
2804 flags |= RT6_LOOKUP_F_IGNORE_LINKSTATE;
2805 rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, NULL, flags);
2806
2807
2808 if (rt == net->ipv6.ip6_null_entry) {
2809 ip6_rt_put(rt);
2810 rt = NULL;
2811 }
2812
2813 return rt;
2814}
2815
2816static int ip6_route_check_nh_onlink(struct net *net,
2817 struct fib6_config *cfg,
2818 const struct net_device *dev,
2819 struct netlink_ext_ack *extack)
2820{
2821 u32 tbid = l3mdev_fib_table(dev) ? : RT_TABLE_MAIN;
2822 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2823 u32 flags = RTF_LOCAL | RTF_ANYCAST | RTF_REJECT;
2824 struct fib6_info *from;
2825 struct rt6_info *grt;
2826 int err;
2827
2828 err = 0;
2829 grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0);
2830 if (grt) {
2831 rcu_read_lock();
2832 from = rcu_dereference(grt->from);
2833 if (!grt->dst.error &&
2834
2835 from && !ipv6_addr_any(&from->fib6_dst.addr) &&
2836 (grt->rt6i_flags & flags || dev != grt->dst.dev)) {
2837 NL_SET_ERR_MSG(extack,
2838 "Nexthop has invalid gateway or device mismatch");
2839 err = -EINVAL;
2840 }
2841 rcu_read_unlock();
2842
2843 ip6_rt_put(grt);
2844 }
2845
2846 return err;
2847}
2848
2849static int ip6_route_check_nh(struct net *net,
2850 struct fib6_config *cfg,
2851 struct net_device **_dev,
2852 struct inet6_dev **idev)
2853{
2854 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2855 struct net_device *dev = _dev ? *_dev : NULL;
2856 struct rt6_info *grt = NULL;
2857 int err = -EHOSTUNREACH;
2858
2859 if (cfg->fc_table) {
2860 int flags = RT6_LOOKUP_F_IFACE;
2861
2862 grt = ip6_nh_lookup_table(net, cfg, gw_addr,
2863 cfg->fc_table, flags);
2864 if (grt) {
2865 if (grt->rt6i_flags & RTF_GATEWAY ||
2866 (dev && dev != grt->dst.dev)) {
2867 ip6_rt_put(grt);
2868 grt = NULL;
2869 }
2870 }
2871 }
2872
2873 if (!grt)
2874 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, NULL, 1);
2875
2876 if (!grt)
2877 goto out;
2878
2879 if (dev) {
2880 if (dev != grt->dst.dev) {
2881 ip6_rt_put(grt);
2882 goto out;
2883 }
2884 } else {
2885 *_dev = dev = grt->dst.dev;
2886 *idev = grt->rt6i_idev;
2887 dev_hold(dev);
2888 in6_dev_hold(grt->rt6i_idev);
2889 }
2890
2891 if (!(grt->rt6i_flags & RTF_GATEWAY))
2892 err = 0;
2893
2894 ip6_rt_put(grt);
2895
2896out:
2897 return err;
2898}
2899
2900static int ip6_validate_gw(struct net *net, struct fib6_config *cfg,
2901 struct net_device **_dev, struct inet6_dev **idev,
2902 struct netlink_ext_ack *extack)
2903{
2904 const struct in6_addr *gw_addr = &cfg->fc_gateway;
2905 int gwa_type = ipv6_addr_type(gw_addr);
2906 bool skip_dev = gwa_type & IPV6_ADDR_LINKLOCAL ? false : true;
2907 const struct net_device *dev = *_dev;
2908 bool need_addr_check = !dev;
2909 int err = -EINVAL;
2910
2911
2912
2913
2914
2915
2916 if (dev &&
2917 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
2918 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
2919 goto out;
2920 }
2921
2922 if (gwa_type != (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST)) {
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932 if (!(gwa_type & (IPV6_ADDR_UNICAST | IPV6_ADDR_MAPPED))) {
2933 NL_SET_ERR_MSG(extack, "Invalid gateway address");
2934 goto out;
2935 }
2936
2937 if (cfg->fc_flags & RTNH_F_ONLINK)
2938 err = ip6_route_check_nh_onlink(net, cfg, dev, extack);
2939 else
2940 err = ip6_route_check_nh(net, cfg, _dev, idev);
2941
2942 if (err)
2943 goto out;
2944 }
2945
2946
2947 dev = *_dev;
2948
2949 err = -EINVAL;
2950 if (!dev) {
2951 NL_SET_ERR_MSG(extack, "Egress device not specified");
2952 goto out;
2953 } else if (dev->flags & IFF_LOOPBACK) {
2954 NL_SET_ERR_MSG(extack,
2955 "Egress device can not be loopback device for this route");
2956 goto out;
2957 }
2958
2959
2960
2961
2962 if (need_addr_check &&
2963 ipv6_chk_addr_and_flags(net, gw_addr, dev, skip_dev, 0, 0)) {
2964 NL_SET_ERR_MSG(extack, "Gateway can not be a local address");
2965 goto out;
2966 }
2967
2968 err = 0;
2969out:
2970 return err;
2971}
2972
2973static bool fib6_is_reject(u32 flags, struct net_device *dev, int addr_type)
2974{
2975 if ((flags & RTF_REJECT) ||
2976 (dev && (dev->flags & IFF_LOOPBACK) &&
2977 !(addr_type & IPV6_ADDR_LOOPBACK) &&
2978 !(flags & RTF_LOCAL)))
2979 return true;
2980
2981 return false;
2982}
2983
2984int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
2985 struct fib6_config *cfg, gfp_t gfp_flags,
2986 struct netlink_ext_ack *extack)
2987{
2988 struct net_device *dev = NULL;
2989 struct inet6_dev *idev = NULL;
2990 int addr_type;
2991 int err;
2992
2993 fib6_nh->fib_nh_family = AF_INET6;
2994
2995 err = -ENODEV;
2996 if (cfg->fc_ifindex) {
2997 dev = dev_get_by_index(net, cfg->fc_ifindex);
2998 if (!dev)
2999 goto out;
3000 idev = in6_dev_get(dev);
3001 if (!idev)
3002 goto out;
3003 }
3004
3005 if (cfg->fc_flags & RTNH_F_ONLINK) {
3006 if (!dev) {
3007 NL_SET_ERR_MSG(extack,
3008 "Nexthop device required for onlink");
3009 goto out;
3010 }
3011
3012 if (!(dev->flags & IFF_UP)) {
3013 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3014 err = -ENETDOWN;
3015 goto out;
3016 }
3017
3018 fib6_nh->fib_nh_flags |= RTNH_F_ONLINK;
3019 }
3020
3021 fib6_nh->fib_nh_weight = 1;
3022
3023
3024
3025
3026 addr_type = ipv6_addr_type(&cfg->fc_dst);
3027 if (fib6_is_reject(cfg->fc_flags, dev, addr_type)) {
3028
3029 if (dev != net->loopback_dev) {
3030 if (dev) {
3031 dev_put(dev);
3032 in6_dev_put(idev);
3033 }
3034 dev = net->loopback_dev;
3035 dev_hold(dev);
3036 idev = in6_dev_get(dev);
3037 if (!idev) {
3038 err = -ENODEV;
3039 goto out;
3040 }
3041 }
3042 goto set_dev;
3043 }
3044
3045 if (cfg->fc_flags & RTF_GATEWAY) {
3046 err = ip6_validate_gw(net, cfg, &dev, &idev, extack);
3047 if (err)
3048 goto out;
3049
3050 fib6_nh->fib_nh_gw6 = cfg->fc_gateway;
3051 fib6_nh->fib_nh_gw_family = AF_INET6;
3052 }
3053
3054 err = -ENODEV;
3055 if (!dev)
3056 goto out;
3057
3058 if (idev->cnf.disable_ipv6) {
3059 NL_SET_ERR_MSG(extack, "IPv6 is disabled on nexthop device");
3060 err = -EACCES;
3061 goto out;
3062 }
3063
3064 if (!(dev->flags & IFF_UP) && !cfg->fc_ignore_dev_down) {
3065 NL_SET_ERR_MSG(extack, "Nexthop device is not up");
3066 err = -ENETDOWN;
3067 goto out;
3068 }
3069
3070 if (!(cfg->fc_flags & (RTF_LOCAL | RTF_ANYCAST)) &&
3071 !netif_carrier_ok(dev))
3072 fib6_nh->fib_nh_flags |= RTNH_F_LINKDOWN;
3073
3074 err = fib_nh_common_init(&fib6_nh->nh_common, cfg->fc_encap,
3075 cfg->fc_encap_type, cfg, gfp_flags, extack);
3076 if (err)
3077 goto out;
3078set_dev:
3079 fib6_nh->fib_nh_dev = dev;
3080 fib6_nh->fib_nh_oif = dev->ifindex;
3081 err = 0;
3082out:
3083 if (idev)
3084 in6_dev_put(idev);
3085
3086 if (err) {
3087 lwtstate_put(fib6_nh->fib_nh_lws);
3088 fib6_nh->fib_nh_lws = NULL;
3089 if (dev)
3090 dev_put(dev);
3091 }
3092
3093 return err;
3094}
3095
3096void fib6_nh_release(struct fib6_nh *fib6_nh)
3097{
3098 fib_nh_common_release(&fib6_nh->nh_common);
3099}
3100
3101static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
3102 gfp_t gfp_flags,
3103 struct netlink_ext_ack *extack)
3104{
3105 struct net *net = cfg->fc_nlinfo.nl_net;
3106 struct fib6_info *rt = NULL;
3107 struct fib6_table *table;
3108 int err = -EINVAL;
3109 int addr_type;
3110
3111
3112 if (cfg->fc_flags & RTF_PCPU) {
3113 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_PCPU");
3114 goto out;
3115 }
3116
3117
3118 if (cfg->fc_flags & RTF_CACHE) {
3119 NL_SET_ERR_MSG(extack, "Userspace can not set RTF_CACHE");
3120 goto out;
3121 }
3122
3123 if (cfg->fc_type > RTN_MAX) {
3124 NL_SET_ERR_MSG(extack, "Invalid route type");
3125 goto out;
3126 }
3127
3128 if (cfg->fc_dst_len > 128) {
3129 NL_SET_ERR_MSG(extack, "Invalid prefix length");
3130 goto out;
3131 }
3132 if (cfg->fc_src_len > 128) {
3133 NL_SET_ERR_MSG(extack, "Invalid source address length");
3134 goto out;
3135 }
3136#ifndef CONFIG_IPV6_SUBTREES
3137 if (cfg->fc_src_len) {
3138 NL_SET_ERR_MSG(extack,
3139 "Specifying source address requires IPV6_SUBTREES to be enabled");
3140 goto out;
3141 }
3142#endif
3143
3144 err = -ENOBUFS;
3145 if (cfg->fc_nlinfo.nlh &&
3146 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
3147 table = fib6_get_table(net, cfg->fc_table);
3148 if (!table) {
3149 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
3150 table = fib6_new_table(net, cfg->fc_table);
3151 }
3152 } else {
3153 table = fib6_new_table(net, cfg->fc_table);
3154 }
3155
3156 if (!table)
3157 goto out;
3158
3159 err = -ENOMEM;
3160 rt = fib6_info_alloc(gfp_flags);
3161 if (!rt)
3162 goto out;
3163
3164 rt->fib6_metrics = ip_fib_metrics_init(net, cfg->fc_mx, cfg->fc_mx_len,
3165 extack);
3166 if (IS_ERR(rt->fib6_metrics)) {
3167 err = PTR_ERR(rt->fib6_metrics);
3168
3169 rt->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
3170 goto out;
3171 }
3172
3173 if (cfg->fc_flags & RTF_ADDRCONF)
3174 rt->dst_nocount = true;
3175
3176 if (cfg->fc_flags & RTF_EXPIRES)
3177 fib6_set_expires(rt, jiffies +
3178 clock_t_to_jiffies(cfg->fc_expires));
3179 else
3180 fib6_clean_expires(rt);
3181
3182 if (cfg->fc_protocol == RTPROT_UNSPEC)
3183 cfg->fc_protocol = RTPROT_BOOT;
3184 rt->fib6_protocol = cfg->fc_protocol;
3185
3186 rt->fib6_table = table;
3187 rt->fib6_metric = cfg->fc_metric;
3188 rt->fib6_type = cfg->fc_type ? : RTN_UNICAST;
3189 rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
3190
3191 ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
3192 rt->fib6_dst.plen = cfg->fc_dst_len;
3193 if (rt->fib6_dst.plen == 128)
3194 rt->dst_host = true;
3195
3196#ifdef CONFIG_IPV6_SUBTREES
3197 ipv6_addr_prefix(&rt->fib6_src.addr, &cfg->fc_src, cfg->fc_src_len);
3198 rt->fib6_src.plen = cfg->fc_src_len;
3199#endif
3200 err = fib6_nh_init(net, &rt->fib6_nh, cfg, gfp_flags, extack);
3201 if (err)
3202 goto out;
3203
3204
3205
3206
3207 addr_type = ipv6_addr_type(&cfg->fc_dst);
3208 if (fib6_is_reject(cfg->fc_flags, rt->fib6_nh.fib_nh_dev, addr_type))
3209 rt->fib6_flags = RTF_REJECT | RTF_NONEXTHOP;
3210
3211 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
3212 struct net_device *dev = fib6_info_nh_dev(rt);
3213
3214 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
3215 NL_SET_ERR_MSG(extack, "Invalid source address");
3216 err = -EINVAL;
3217 goto out;
3218 }
3219 rt->fib6_prefsrc.addr = cfg->fc_prefsrc;
3220 rt->fib6_prefsrc.plen = 128;
3221 } else
3222 rt->fib6_prefsrc.plen = 0;
3223
3224 return rt;
3225out:
3226 fib6_info_release(rt);
3227 return ERR_PTR(err);
3228}
3229
3230int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
3231 struct netlink_ext_ack *extack)
3232{
3233 struct fib6_info *rt;
3234 int err;
3235
3236 rt = ip6_route_info_create(cfg, gfp_flags, extack);
3237 if (IS_ERR(rt))
3238 return PTR_ERR(rt);
3239
3240 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, extack);
3241 fib6_info_release(rt);
3242
3243 return err;
3244}
3245
3246static int __ip6_del_rt(struct fib6_info *rt, struct nl_info *info)
3247{
3248 struct net *net = info->nl_net;
3249 struct fib6_table *table;
3250 int err;
3251
3252 if (rt == net->ipv6.fib6_null_entry) {
3253 err = -ENOENT;
3254 goto out;
3255 }
3256
3257 table = rt->fib6_table;
3258 spin_lock_bh(&table->tb6_lock);
3259 err = fib6_del(rt, info);
3260 spin_unlock_bh(&table->tb6_lock);
3261
3262out:
3263 fib6_info_release(rt);
3264 return err;
3265}
3266
3267int ip6_del_rt(struct net *net, struct fib6_info *rt)
3268{
3269 struct nl_info info = { .nl_net = net };
3270
3271 return __ip6_del_rt(rt, &info);
3272}
3273
3274static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
3275{
3276 struct nl_info *info = &cfg->fc_nlinfo;
3277 struct net *net = info->nl_net;
3278 struct sk_buff *skb = NULL;
3279 struct fib6_table *table;
3280 int err = -ENOENT;
3281
3282 if (rt == net->ipv6.fib6_null_entry)
3283 goto out_put;
3284 table = rt->fib6_table;
3285 spin_lock_bh(&table->tb6_lock);
3286
3287 if (rt->fib6_nsiblings && cfg->fc_delete_all_nh) {
3288 struct fib6_info *sibling, *next_sibling;
3289
3290
3291 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
3292 if (skb) {
3293 u32 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
3294
3295 if (rt6_fill_node(net, skb, rt, NULL,
3296 NULL, NULL, 0, RTM_DELROUTE,
3297 info->portid, seq, 0) < 0) {
3298 kfree_skb(skb);
3299 skb = NULL;
3300 } else
3301 info->skip_notify = 1;
3302 }
3303
3304 list_for_each_entry_safe(sibling, next_sibling,
3305 &rt->fib6_siblings,
3306 fib6_siblings) {
3307 err = fib6_del(sibling, info);
3308 if (err)
3309 goto out_unlock;
3310 }
3311 }
3312
3313 err = fib6_del(rt, info);
3314out_unlock:
3315 spin_unlock_bh(&table->tb6_lock);
3316out_put:
3317 fib6_info_release(rt);
3318
3319 if (skb) {
3320 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
3321 info->nlh, gfp_any());
3322 }
3323 return err;
3324}
3325
3326static int ip6_del_cached_rt(struct rt6_info *rt, struct fib6_config *cfg)
3327{
3328 int rc = -ESRCH;
3329
3330 if (cfg->fc_ifindex && rt->dst.dev->ifindex != cfg->fc_ifindex)
3331 goto out;
3332
3333 if (cfg->fc_flags & RTF_GATEWAY &&
3334 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
3335 goto out;
3336
3337 rc = rt6_remove_exception_rt(rt);
3338out:
3339 return rc;
3340}
3341
3342static int ip6_route_del(struct fib6_config *cfg,
3343 struct netlink_ext_ack *extack)
3344{
3345 struct rt6_info *rt_cache;
3346 struct fib6_table *table;
3347 struct fib6_info *rt;
3348 struct fib6_node *fn;
3349 int err = -ESRCH;
3350
3351 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
3352 if (!table) {
3353 NL_SET_ERR_MSG(extack, "FIB table does not exist");
3354 return err;
3355 }
3356
3357 rcu_read_lock();
3358
3359 fn = fib6_locate(&table->tb6_root,
3360 &cfg->fc_dst, cfg->fc_dst_len,
3361 &cfg->fc_src, cfg->fc_src_len,
3362 !(cfg->fc_flags & RTF_CACHE));
3363
3364 if (fn) {
3365 for_each_fib6_node_rt_rcu(fn) {
3366 struct fib6_nh *nh;
3367
3368 if (cfg->fc_flags & RTF_CACHE) {
3369 struct fib6_result res = {
3370 .f6i = rt,
3371 };
3372 int rc;
3373
3374 rt_cache = rt6_find_cached_rt(&res,
3375 &cfg->fc_dst,
3376 &cfg->fc_src);
3377 if (rt_cache) {
3378 rc = ip6_del_cached_rt(rt_cache, cfg);
3379 if (rc != -ESRCH) {
3380 rcu_read_unlock();
3381 return rc;
3382 }
3383 }
3384 continue;
3385 }
3386
3387 nh = &rt->fib6_nh;
3388 if (cfg->fc_ifindex &&
3389 (!nh->fib_nh_dev ||
3390 nh->fib_nh_dev->ifindex != cfg->fc_ifindex))
3391 continue;
3392 if (cfg->fc_flags & RTF_GATEWAY &&
3393 !ipv6_addr_equal(&cfg->fc_gateway, &nh->fib_nh_gw6))
3394 continue;
3395 if (cfg->fc_metric && cfg->fc_metric != rt->fib6_metric)
3396 continue;
3397 if (cfg->fc_protocol && cfg->fc_protocol != rt->fib6_protocol)
3398 continue;
3399 if (!fib6_info_hold_safe(rt))
3400 continue;
3401 rcu_read_unlock();
3402
3403
3404 if (cfg->fc_flags & RTF_GATEWAY)
3405 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
3406
3407 return __ip6_del_rt_siblings(rt, cfg);
3408 }
3409 }
3410 rcu_read_unlock();
3411
3412 return err;
3413}
3414
3415static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
3416{
3417 struct netevent_redirect netevent;
3418 struct rt6_info *rt, *nrt = NULL;
3419 struct fib6_result res = {};
3420 struct ndisc_options ndopts;
3421 struct inet6_dev *in6_dev;
3422 struct neighbour *neigh;
3423 struct rd_msg *msg;
3424 int optlen, on_link;
3425 u8 *lladdr;
3426
3427 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
3428 optlen -= sizeof(*msg);
3429
3430 if (optlen < 0) {
3431 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
3432 return;
3433 }
3434
3435 msg = (struct rd_msg *)icmp6_hdr(skb);
3436
3437 if (ipv6_addr_is_multicast(&msg->dest)) {
3438 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
3439 return;
3440 }
3441
3442 on_link = 0;
3443 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
3444 on_link = 1;
3445 } else if (ipv6_addr_type(&msg->target) !=
3446 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
3447 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
3448 return;
3449 }
3450
3451 in6_dev = __in6_dev_get(skb->dev);
3452 if (!in6_dev)
3453 return;
3454 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
3455 return;
3456
3457
3458
3459
3460
3461
3462 if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
3463 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
3464 return;
3465 }
3466
3467 lladdr = NULL;
3468 if (ndopts.nd_opts_tgt_lladdr) {
3469 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
3470 skb->dev);
3471 if (!lladdr) {
3472 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
3473 return;
3474 }
3475 }
3476
3477 rt = (struct rt6_info *) dst;
3478 if (rt->rt6i_flags & RTF_REJECT) {
3479 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
3480 return;
3481 }
3482
3483
3484
3485
3486
3487 dst_confirm_neigh(&rt->dst, &ipv6_hdr(skb)->saddr);
3488
3489 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
3490 if (!neigh)
3491 return;
3492
3493
3494
3495
3496
3497 ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
3498 NEIGH_UPDATE_F_WEAK_OVERRIDE|
3499 NEIGH_UPDATE_F_OVERRIDE|
3500 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
3501 NEIGH_UPDATE_F_ISROUTER)),
3502 NDISC_REDIRECT, &ndopts);
3503
3504 rcu_read_lock();
3505 res.f6i = rcu_dereference(rt->from);
3506 if (!res.f6i)
3507 goto out;
3508
3509 res.nh = &res.f6i->fib6_nh;
3510 res.fib6_flags = res.f6i->fib6_flags;
3511 res.fib6_type = res.f6i->fib6_type;
3512 nrt = ip6_rt_cache_alloc(&res, &msg->dest, NULL);
3513 if (!nrt)
3514 goto out;
3515
3516 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
3517 if (on_link)
3518 nrt->rt6i_flags &= ~RTF_GATEWAY;
3519
3520 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
3521
3522
3523 if (rt6_insert_exception(nrt, &res)) {
3524 dst_release_immediate(&nrt->dst);
3525 goto out;
3526 }
3527
3528 netevent.old = &rt->dst;
3529 netevent.new = &nrt->dst;
3530 netevent.daddr = &msg->dest;
3531 netevent.neigh = neigh;
3532 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
3533
3534out:
3535 rcu_read_unlock();
3536 neigh_release(neigh);
3537}
3538
3539#ifdef CONFIG_IPV6_ROUTE_INFO
3540static struct fib6_info *rt6_get_route_info(struct net *net,
3541 const struct in6_addr *prefix, int prefixlen,
3542 const struct in6_addr *gwaddr,
3543 struct net_device *dev)
3544{
3545 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
3546 int ifindex = dev->ifindex;
3547 struct fib6_node *fn;
3548 struct fib6_info *rt = NULL;
3549 struct fib6_table *table;
3550
3551 table = fib6_get_table(net, tb_id);
3552 if (!table)
3553 return NULL;
3554
3555 rcu_read_lock();
3556 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0, true);
3557 if (!fn)
3558 goto out;
3559
3560 for_each_fib6_node_rt_rcu(fn) {
3561 if (rt->fib6_nh.fib_nh_dev->ifindex != ifindex)
3562 continue;
3563 if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
3564 !rt->fib6_nh.fib_nh_gw_family)
3565 continue;
3566 if (!ipv6_addr_equal(&rt->fib6_nh.fib_nh_gw6, gwaddr))
3567 continue;
3568 if (!fib6_info_hold_safe(rt))
3569 continue;
3570 break;
3571 }
3572out:
3573 rcu_read_unlock();
3574 return rt;
3575}
3576
3577static struct fib6_info *rt6_add_route_info(struct net *net,
3578 const struct in6_addr *prefix, int prefixlen,
3579 const struct in6_addr *gwaddr,
3580 struct net_device *dev,
3581 unsigned int pref)
3582{
3583 struct fib6_config cfg = {
3584 .fc_metric = IP6_RT_PRIO_USER,
3585 .fc_ifindex = dev->ifindex,
3586 .fc_dst_len = prefixlen,
3587 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
3588 RTF_UP | RTF_PREF(pref),
3589 .fc_protocol = RTPROT_RA,
3590 .fc_type = RTN_UNICAST,
3591 .fc_nlinfo.portid = 0,
3592 .fc_nlinfo.nlh = NULL,
3593 .fc_nlinfo.nl_net = net,
3594 };
3595
3596 cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
3597 cfg.fc_dst = *prefix;
3598 cfg.fc_gateway = *gwaddr;
3599
3600
3601 if (!prefixlen)
3602 cfg.fc_flags |= RTF_DEFAULT;
3603
3604 ip6_route_add(&cfg, GFP_ATOMIC, NULL);
3605
3606 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
3607}
3608#endif
3609
3610struct fib6_info *rt6_get_dflt_router(struct net *net,
3611 const struct in6_addr *addr,
3612 struct net_device *dev)
3613{
3614 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
3615 struct fib6_info *rt;
3616 struct fib6_table *table;
3617
3618 table = fib6_get_table(net, tb_id);
3619 if (!table)
3620 return NULL;
3621
3622 rcu_read_lock();
3623 for_each_fib6_node_rt_rcu(&table->tb6_root) {
3624 struct fib6_nh *nh = &rt->fib6_nh;
3625
3626 if (dev == nh->fib_nh_dev &&
3627 ((rt->fib6_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
3628 ipv6_addr_equal(&nh->fib_nh_gw6, addr))
3629 break;
3630 }
3631 if (rt && !fib6_info_hold_safe(rt))
3632 rt = NULL;
3633 rcu_read_unlock();
3634 return rt;
3635}
3636
3637struct fib6_info *rt6_add_dflt_router(struct net *net,
3638 const struct in6_addr *gwaddr,
3639 struct net_device *dev,
3640 unsigned int pref)
3641{
3642 struct fib6_config cfg = {
3643 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
3644 .fc_metric = IP6_RT_PRIO_USER,
3645 .fc_ifindex = dev->ifindex,
3646 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
3647 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
3648 .fc_protocol = RTPROT_RA,
3649 .fc_type = RTN_UNICAST,
3650 .fc_nlinfo.portid = 0,
3651 .fc_nlinfo.nlh = NULL,
3652 .fc_nlinfo.nl_net = net,
3653 };
3654
3655 cfg.fc_gateway = *gwaddr;
3656
3657 if (!ip6_route_add(&cfg, GFP_ATOMIC, NULL)) {
3658 struct fib6_table *table;
3659
3660 table = fib6_get_table(dev_net(dev), cfg.fc_table);
3661 if (table)
3662 table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
3663 }
3664
3665 return rt6_get_dflt_router(net, gwaddr, dev);
3666}
3667
3668static void __rt6_purge_dflt_routers(struct net *net,
3669 struct fib6_table *table)
3670{
3671 struct fib6_info *rt;
3672
3673restart:
3674 rcu_read_lock();
3675 for_each_fib6_node_rt_rcu(&table->tb6_root) {
3676 struct net_device *dev = fib6_info_nh_dev(rt);
3677 struct inet6_dev *idev = dev ? __in6_dev_get(dev) : NULL;
3678
3679 if (rt->fib6_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
3680 (!idev || idev->cnf.accept_ra != 2) &&
3681 fib6_info_hold_safe(rt)) {
3682 rcu_read_unlock();
3683 ip6_del_rt(net, rt);
3684 goto restart;
3685 }
3686 }
3687 rcu_read_unlock();
3688
3689 table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
3690}
3691
3692void rt6_purge_dflt_routers(struct net *net)
3693{
3694 struct fib6_table *table;
3695 struct hlist_head *head;
3696 unsigned int h;
3697
3698 rcu_read_lock();
3699
3700 for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
3701 head = &net->ipv6.fib_table_hash[h];
3702 hlist_for_each_entry_rcu(table, head, tb6_hlist) {
3703 if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
3704 __rt6_purge_dflt_routers(net, table);
3705 }
3706 }
3707
3708 rcu_read_unlock();
3709}
3710
3711static void rtmsg_to_fib6_config(struct net *net,
3712 struct in6_rtmsg *rtmsg,
3713 struct fib6_config *cfg)
3714{
3715 *cfg = (struct fib6_config){
3716 .fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
3717 : RT6_TABLE_MAIN,
3718 .fc_ifindex = rtmsg->rtmsg_ifindex,
3719 .fc_metric = rtmsg->rtmsg_metric ? : IP6_RT_PRIO_USER,
3720 .fc_expires = rtmsg->rtmsg_info,
3721 .fc_dst_len = rtmsg->rtmsg_dst_len,
3722 .fc_src_len = rtmsg->rtmsg_src_len,
3723 .fc_flags = rtmsg->rtmsg_flags,
3724 .fc_type = rtmsg->rtmsg_type,
3725
3726 .fc_nlinfo.nl_net = net,
3727
3728 .fc_dst = rtmsg->rtmsg_dst,
3729 .fc_src = rtmsg->rtmsg_src,
3730 .fc_gateway = rtmsg->rtmsg_gateway,
3731 };
3732}
3733
3734int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3735{
3736 struct fib6_config cfg;
3737 struct in6_rtmsg rtmsg;
3738 int err;
3739
3740 switch (cmd) {
3741 case SIOCADDRT:
3742 case SIOCDELRT:
3743 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3744 return -EPERM;
3745 err = copy_from_user(&rtmsg, arg,
3746 sizeof(struct in6_rtmsg));
3747 if (err)
3748 return -EFAULT;
3749
3750 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
3751
3752 rtnl_lock();
3753 switch (cmd) {
3754 case SIOCADDRT:
3755 err = ip6_route_add(&cfg, GFP_KERNEL, NULL);
3756 break;
3757 case SIOCDELRT:
3758 err = ip6_route_del(&cfg, NULL);
3759 break;
3760 default:
3761 err = -EINVAL;
3762 }
3763 rtnl_unlock();
3764
3765 return err;
3766 }
3767
3768 return -EINVAL;
3769}
3770
3771
3772
3773
3774
3775static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
3776{
3777 struct dst_entry *dst = skb_dst(skb);
3778 struct net *net = dev_net(dst->dev);
3779 struct inet6_dev *idev;
3780 int type;
3781
3782 if (netif_is_l3_master(skb->dev) &&
3783 dst->dev == net->loopback_dev)
3784 idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
3785 else
3786 idev = ip6_dst_idev(dst);
3787
3788 switch (ipstats_mib_noroutes) {
3789 case IPSTATS_MIB_INNOROUTES:
3790 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
3791 if (type == IPV6_ADDR_ANY) {
3792 IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
3793 break;
3794 }
3795
3796 case IPSTATS_MIB_OUTNOROUTES:
3797 IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
3798 break;
3799 }
3800
3801
3802 if (netif_is_l3_master(skb->dev))
3803 skb_dst_drop(skb);
3804
3805 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
3806 kfree_skb(skb);
3807 return 0;
3808}
3809
3810static int ip6_pkt_discard(struct sk_buff *skb)
3811{
3812 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
3813}
3814
3815static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
3816{
3817 skb->dev = skb_dst(skb)->dev;
3818 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
3819}
3820
3821static int ip6_pkt_prohibit(struct sk_buff *skb)
3822{
3823 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
3824}
3825
3826static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
3827{
3828 skb->dev = skb_dst(skb)->dev;
3829 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
3830}
3831
3832
3833
3834
3835
3836struct fib6_info *addrconf_f6i_alloc(struct net *net,
3837 struct inet6_dev *idev,
3838 const struct in6_addr *addr,
3839 bool anycast, gfp_t gfp_flags)
3840{
3841 struct fib6_config cfg = {
3842 .fc_table = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL,
3843 .fc_ifindex = idev->dev->ifindex,
3844 .fc_flags = RTF_UP | RTF_ADDRCONF | RTF_NONEXTHOP,
3845 .fc_dst = *addr,
3846 .fc_dst_len = 128,
3847 .fc_protocol = RTPROT_KERNEL,
3848 .fc_nlinfo.nl_net = net,
3849 .fc_ignore_dev_down = true,
3850 };
3851
3852 if (anycast) {
3853 cfg.fc_type = RTN_ANYCAST;
3854 cfg.fc_flags |= RTF_ANYCAST;
3855 } else {
3856 cfg.fc_type = RTN_LOCAL;
3857 cfg.fc_flags |= RTF_LOCAL;
3858 }
3859
3860 return ip6_route_info_create(&cfg, gfp_flags, NULL);
3861}
3862
3863
3864struct arg_dev_net_ip {
3865 struct net_device *dev;
3866 struct net *net;
3867 struct in6_addr *addr;
3868};
3869
3870static int fib6_remove_prefsrc(struct fib6_info *rt, void *arg)
3871{
3872 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
3873 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
3874 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
3875
3876 if (((void *)rt->fib6_nh.fib_nh_dev == dev || !dev) &&
3877 rt != net->ipv6.fib6_null_entry &&
3878 ipv6_addr_equal(addr, &rt->fib6_prefsrc.addr)) {
3879 spin_lock_bh(&rt6_exception_lock);
3880
3881 rt->fib6_prefsrc.plen = 0;
3882 spin_unlock_bh(&rt6_exception_lock);
3883 }
3884 return 0;
3885}
3886
3887void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
3888{
3889 struct net *net = dev_net(ifp->idev->dev);
3890 struct arg_dev_net_ip adni = {
3891 .dev = ifp->idev->dev,
3892 .net = net,
3893 .addr = &ifp->addr,
3894 };
3895 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
3896}
3897
3898#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
3899
3900
3901static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
3902{
3903 struct in6_addr *gateway = (struct in6_addr *)arg;
3904
3905 if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
3906 rt->fib6_nh.fib_nh_gw_family &&
3907 ipv6_addr_equal(gateway, &rt->fib6_nh.fib_nh_gw6)) {
3908 return -1;
3909 }
3910
3911
3912
3913
3914
3915 rt6_exceptions_clean_tohost(rt, gateway);
3916
3917 return 0;
3918}
3919
3920void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
3921{
3922 fib6_clean_all(net, fib6_clean_tohost, gateway);
3923}
3924
3925struct arg_netdev_event {
3926 const struct net_device *dev;
3927 union {
3928 unsigned char nh_flags;
3929 unsigned long event;
3930 };
3931};
3932
3933static struct fib6_info *rt6_multipath_first_sibling(const struct fib6_info *rt)
3934{
3935 struct fib6_info *iter;
3936 struct fib6_node *fn;
3937
3938 fn = rcu_dereference_protected(rt->fib6_node,
3939 lockdep_is_held(&rt->fib6_table->tb6_lock));
3940 iter = rcu_dereference_protected(fn->leaf,
3941 lockdep_is_held(&rt->fib6_table->tb6_lock));
3942 while (iter) {
3943 if (iter->fib6_metric == rt->fib6_metric &&
3944 rt6_qualify_for_ecmp(iter))
3945 return iter;
3946 iter = rcu_dereference_protected(iter->fib6_next,
3947 lockdep_is_held(&rt->fib6_table->tb6_lock));
3948 }
3949
3950 return NULL;
3951}
3952
3953static bool rt6_is_dead(const struct fib6_info *rt)
3954{
3955 if (rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD ||
3956 (rt->fib6_nh.fib_nh_flags & RTNH_F_LINKDOWN &&
3957 ip6_ignore_linkdown(rt->fib6_nh.fib_nh_dev)))
3958 return true;
3959
3960 return false;
3961}
3962
3963static int rt6_multipath_total_weight(const struct fib6_info *rt)
3964{
3965 struct fib6_info *iter;
3966 int total = 0;
3967
3968 if (!rt6_is_dead(rt))
3969 total += rt->fib6_nh.fib_nh_weight;
3970
3971 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings) {
3972 if (!rt6_is_dead(iter))
3973 total += iter->fib6_nh.fib_nh_weight;
3974 }
3975
3976 return total;
3977}
3978
3979static void rt6_upper_bound_set(struct fib6_info *rt, int *weight, int total)
3980{
3981 int upper_bound = -1;
3982
3983 if (!rt6_is_dead(rt)) {
3984 *weight += rt->fib6_nh.fib_nh_weight;
3985 upper_bound = DIV_ROUND_CLOSEST_ULL((u64) (*weight) << 31,
3986 total) - 1;
3987 }
3988 atomic_set(&rt->fib6_nh.fib_nh_upper_bound, upper_bound);
3989}
3990
3991static void rt6_multipath_upper_bound_set(struct fib6_info *rt, int total)
3992{
3993 struct fib6_info *iter;
3994 int weight = 0;
3995
3996 rt6_upper_bound_set(rt, &weight, total);
3997
3998 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
3999 rt6_upper_bound_set(iter, &weight, total);
4000}
4001
4002void rt6_multipath_rebalance(struct fib6_info *rt)
4003{
4004 struct fib6_info *first;
4005 int total;
4006
4007
4008
4009
4010
4011 if (!rt->fib6_nsiblings || rt->should_flush)
4012 return;
4013
4014
4015
4016
4017
4018 first = rt6_multipath_first_sibling(rt);
4019 if (WARN_ON_ONCE(!first))
4020 return;
4021
4022 total = rt6_multipath_total_weight(first);
4023 rt6_multipath_upper_bound_set(first, total);
4024}
4025
4026static int fib6_ifup(struct fib6_info *rt, void *p_arg)
4027{
4028 const struct arg_netdev_event *arg = p_arg;
4029 struct net *net = dev_net(arg->dev);
4030
4031 if (rt != net->ipv6.fib6_null_entry &&
4032 rt->fib6_nh.fib_nh_dev == arg->dev) {
4033 rt->fib6_nh.fib_nh_flags &= ~arg->nh_flags;
4034 fib6_update_sernum_upto_root(net, rt);
4035 rt6_multipath_rebalance(rt);
4036 }
4037
4038 return 0;
4039}
4040
4041void rt6_sync_up(struct net_device *dev, unsigned char nh_flags)
4042{
4043 struct arg_netdev_event arg = {
4044 .dev = dev,
4045 {
4046 .nh_flags = nh_flags,
4047 },
4048 };
4049
4050 if (nh_flags & RTNH_F_DEAD && netif_carrier_ok(dev))
4051 arg.nh_flags |= RTNH_F_LINKDOWN;
4052
4053 fib6_clean_all(dev_net(dev), fib6_ifup, &arg);
4054}
4055
4056static bool rt6_multipath_uses_dev(const struct fib6_info *rt,
4057 const struct net_device *dev)
4058{
4059 struct fib6_info *iter;
4060
4061 if (rt->fib6_nh.fib_nh_dev == dev)
4062 return true;
4063 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4064 if (iter->fib6_nh.fib_nh_dev == dev)
4065 return true;
4066
4067 return false;
4068}
4069
4070static void rt6_multipath_flush(struct fib6_info *rt)
4071{
4072 struct fib6_info *iter;
4073
4074 rt->should_flush = 1;
4075 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4076 iter->should_flush = 1;
4077}
4078
4079static unsigned int rt6_multipath_dead_count(const struct fib6_info *rt,
4080 const struct net_device *down_dev)
4081{
4082 struct fib6_info *iter;
4083 unsigned int dead = 0;
4084
4085 if (rt->fib6_nh.fib_nh_dev == down_dev ||
4086 rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
4087 dead++;
4088 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4089 if (iter->fib6_nh.fib_nh_dev == down_dev ||
4090 iter->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
4091 dead++;
4092
4093 return dead;
4094}
4095
4096static void rt6_multipath_nh_flags_set(struct fib6_info *rt,
4097 const struct net_device *dev,
4098 unsigned char nh_flags)
4099{
4100 struct fib6_info *iter;
4101
4102 if (rt->fib6_nh.fib_nh_dev == dev)
4103 rt->fib6_nh.fib_nh_flags |= nh_flags;
4104 list_for_each_entry(iter, &rt->fib6_siblings, fib6_siblings)
4105 if (iter->fib6_nh.fib_nh_dev == dev)
4106 iter->fib6_nh.fib_nh_flags |= nh_flags;
4107}
4108
4109
4110static int fib6_ifdown(struct fib6_info *rt, void *p_arg)
4111{
4112 const struct arg_netdev_event *arg = p_arg;
4113 const struct net_device *dev = arg->dev;
4114 struct net *net = dev_net(dev);
4115
4116 if (rt == net->ipv6.fib6_null_entry)
4117 return 0;
4118
4119 switch (arg->event) {
4120 case NETDEV_UNREGISTER:
4121 return rt->fib6_nh.fib_nh_dev == dev ? -1 : 0;
4122 case NETDEV_DOWN:
4123 if (rt->should_flush)
4124 return -1;
4125 if (!rt->fib6_nsiblings)
4126 return rt->fib6_nh.fib_nh_dev == dev ? -1 : 0;
4127 if (rt6_multipath_uses_dev(rt, dev)) {
4128 unsigned int count;
4129
4130 count = rt6_multipath_dead_count(rt, dev);
4131 if (rt->fib6_nsiblings + 1 == count) {
4132 rt6_multipath_flush(rt);
4133 return -1;
4134 }
4135 rt6_multipath_nh_flags_set(rt, dev, RTNH_F_DEAD |
4136 RTNH_F_LINKDOWN);
4137 fib6_update_sernum(net, rt);
4138 rt6_multipath_rebalance(rt);
4139 }
4140 return -2;
4141 case NETDEV_CHANGE:
4142 if (rt->fib6_nh.fib_nh_dev != dev ||
4143 rt->fib6_flags & (RTF_LOCAL | RTF_ANYCAST))
4144 break;
4145 rt->fib6_nh.fib_nh_flags |= RTNH_F_LINKDOWN;
4146 rt6_multipath_rebalance(rt);
4147 break;
4148 }
4149
4150 return 0;
4151}
4152
4153void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
4154{
4155 struct arg_netdev_event arg = {
4156 .dev = dev,
4157 {
4158 .event = event,
4159 },
4160 };
4161 struct net *net = dev_net(dev);
4162
4163 if (net->ipv6.sysctl.skip_notify_on_dev_down)
4164 fib6_clean_all_skip_notify(net, fib6_ifdown, &arg);
4165 else
4166 fib6_clean_all(net, fib6_ifdown, &arg);
4167}
4168
4169void rt6_disable_ip(struct net_device *dev, unsigned long event)
4170{
4171 rt6_sync_down_dev(dev, event);
4172 rt6_uncached_list_flush_dev(dev_net(dev), dev);
4173 neigh_ifdown(&nd_tbl, dev);
4174}
4175
4176struct rt6_mtu_change_arg {
4177 struct net_device *dev;
4178 unsigned int mtu;
4179};
4180
4181static int rt6_mtu_change_route(struct fib6_info *rt, void *p_arg)
4182{
4183 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
4184 struct inet6_dev *idev;
4185
4186
4187
4188
4189
4190
4191
4192 idev = __in6_dev_get(arg->dev);
4193 if (!idev)
4194 return 0;
4195
4196
4197
4198
4199
4200
4201 if (rt->fib6_nh.fib_nh_dev == arg->dev &&
4202 !fib6_metric_locked(rt, RTAX_MTU)) {
4203 u32 mtu = rt->fib6_pmtu;
4204
4205 if (mtu >= arg->mtu ||
4206 (mtu < arg->mtu && mtu == idev->cnf.mtu6))
4207 fib6_metric_set(rt, RTAX_MTU, arg->mtu);
4208
4209 spin_lock_bh(&rt6_exception_lock);
4210 rt6_exceptions_update_pmtu(idev, rt, arg->mtu);
4211 spin_unlock_bh(&rt6_exception_lock);
4212 }
4213 return 0;
4214}
4215
4216void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
4217{
4218 struct rt6_mtu_change_arg arg = {
4219 .dev = dev,
4220 .mtu = mtu,
4221 };
4222
4223 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
4224}
4225
4226static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
4227 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
4228 [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) },
4229 [RTA_OIF] = { .type = NLA_U32 },
4230 [RTA_IIF] = { .type = NLA_U32 },
4231 [RTA_PRIORITY] = { .type = NLA_U32 },
4232 [RTA_METRICS] = { .type = NLA_NESTED },
4233 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
4234 [RTA_PREF] = { .type = NLA_U8 },
4235 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
4236 [RTA_ENCAP] = { .type = NLA_NESTED },
4237 [RTA_EXPIRES] = { .type = NLA_U32 },
4238 [RTA_UID] = { .type = NLA_U32 },
4239 [RTA_MARK] = { .type = NLA_U32 },
4240 [RTA_TABLE] = { .type = NLA_U32 },
4241 [RTA_IP_PROTO] = { .type = NLA_U8 },
4242 [RTA_SPORT] = { .type = NLA_U16 },
4243 [RTA_DPORT] = { .type = NLA_U16 },
4244};
4245
4246static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
4247 struct fib6_config *cfg,
4248 struct netlink_ext_ack *extack)
4249{
4250 struct rtmsg *rtm;
4251 struct nlattr *tb[RTA_MAX+1];
4252 unsigned int pref;
4253 int err;
4254
4255 err = nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
4256 rtm_ipv6_policy, extack);
4257 if (err < 0)
4258 goto errout;
4259
4260 err = -EINVAL;
4261 rtm = nlmsg_data(nlh);
4262
4263 *cfg = (struct fib6_config){
4264 .fc_table = rtm->rtm_table,
4265 .fc_dst_len = rtm->rtm_dst_len,
4266 .fc_src_len = rtm->rtm_src_len,
4267 .fc_flags = RTF_UP,
4268 .fc_protocol = rtm->rtm_protocol,
4269 .fc_type = rtm->rtm_type,
4270
4271 .fc_nlinfo.portid = NETLINK_CB(skb).portid,
4272 .fc_nlinfo.nlh = nlh,
4273 .fc_nlinfo.nl_net = sock_net(skb->sk),
4274 };
4275
4276 if (rtm->rtm_type == RTN_UNREACHABLE ||
4277 rtm->rtm_type == RTN_BLACKHOLE ||
4278 rtm->rtm_type == RTN_PROHIBIT ||
4279 rtm->rtm_type == RTN_THROW)
4280 cfg->fc_flags |= RTF_REJECT;
4281
4282 if (rtm->rtm_type == RTN_LOCAL)
4283 cfg->fc_flags |= RTF_LOCAL;
4284
4285 if (rtm->rtm_flags & RTM_F_CLONED)
4286 cfg->fc_flags |= RTF_CACHE;
4287
4288 cfg->fc_flags |= (rtm->rtm_flags & RTNH_F_ONLINK);
4289
4290 if (tb[RTA_GATEWAY]) {
4291 cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
4292 cfg->fc_flags |= RTF_GATEWAY;
4293 }
4294 if (tb[RTA_VIA]) {
4295 NL_SET_ERR_MSG(extack, "IPv6 does not support RTA_VIA attribute");
4296 goto errout;
4297 }
4298
4299 if (tb[RTA_DST]) {
4300 int plen = (rtm->rtm_dst_len + 7) >> 3;
4301
4302 if (nla_len(tb[RTA_DST]) < plen)
4303 goto errout;
4304
4305 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
4306 }
4307
4308 if (tb[RTA_SRC]) {
4309 int plen = (rtm->rtm_src_len + 7) >> 3;
4310
4311 if (nla_len(tb[RTA_SRC]) < plen)
4312 goto errout;
4313
4314 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
4315 }
4316
4317 if (tb[RTA_PREFSRC])
4318 cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
4319
4320 if (tb[RTA_OIF])
4321 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
4322
4323 if (tb[RTA_PRIORITY])
4324 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
4325
4326 if (tb[RTA_METRICS]) {
4327 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
4328 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
4329 }
4330
4331 if (tb[RTA_TABLE])
4332 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
4333
4334 if (tb[RTA_MULTIPATH]) {
4335 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
4336 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
4337
4338 err = lwtunnel_valid_encap_type_attr(cfg->fc_mp,
4339 cfg->fc_mp_len, extack);
4340 if (err < 0)
4341 goto errout;
4342 }
4343
4344 if (tb[RTA_PREF]) {
4345 pref = nla_get_u8(tb[RTA_PREF]);
4346 if (pref != ICMPV6_ROUTER_PREF_LOW &&
4347 pref != ICMPV6_ROUTER_PREF_HIGH)
4348 pref = ICMPV6_ROUTER_PREF_MEDIUM;
4349 cfg->fc_flags |= RTF_PREF(pref);
4350 }
4351
4352 if (tb[RTA_ENCAP])
4353 cfg->fc_encap = tb[RTA_ENCAP];
4354
4355 if (tb[RTA_ENCAP_TYPE]) {
4356 cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
4357
4358 err = lwtunnel_valid_encap_type(cfg->fc_encap_type, extack);
4359 if (err < 0)
4360 goto errout;
4361 }
4362
4363 if (tb[RTA_EXPIRES]) {
4364 unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
4365
4366 if (addrconf_finite_timeout(timeout)) {
4367 cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
4368 cfg->fc_flags |= RTF_EXPIRES;
4369 }
4370 }
4371
4372 err = 0;
4373errout:
4374 return err;
4375}
4376
4377struct rt6_nh {
4378 struct fib6_info *fib6_info;
4379 struct fib6_config r_cfg;
4380 struct list_head next;
4381};
4382
4383static int ip6_route_info_append(struct net *net,
4384 struct list_head *rt6_nh_list,
4385 struct fib6_info *rt,
4386 struct fib6_config *r_cfg)
4387{
4388 struct rt6_nh *nh;
4389 int err = -EEXIST;
4390
4391 list_for_each_entry(nh, rt6_nh_list, next) {
4392
4393 if (rt6_duplicate_nexthop(nh->fib6_info, rt))
4394 return err;
4395 }
4396
4397 nh = kzalloc(sizeof(*nh), GFP_KERNEL);
4398 if (!nh)
4399 return -ENOMEM;
4400 nh->fib6_info = rt;
4401 memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
4402 list_add_tail(&nh->next, rt6_nh_list);
4403
4404 return 0;
4405}
4406
4407static void ip6_route_mpath_notify(struct fib6_info *rt,
4408 struct fib6_info *rt_last,
4409 struct nl_info *info,
4410 __u16 nlflags)
4411{
4412
4413
4414
4415
4416
4417
4418 if ((nlflags & NLM_F_APPEND) && rt_last && rt_last->fib6_nsiblings) {
4419 rt = list_first_entry(&rt_last->fib6_siblings,
4420 struct fib6_info,
4421 fib6_siblings);
4422 }
4423
4424 if (rt)
4425 inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags);
4426}
4427
4428static int ip6_route_multipath_add(struct fib6_config *cfg,
4429 struct netlink_ext_ack *extack)
4430{
4431 struct fib6_info *rt_notif = NULL, *rt_last = NULL;
4432 struct nl_info *info = &cfg->fc_nlinfo;
4433 struct fib6_config r_cfg;
4434 struct rtnexthop *rtnh;
4435 struct fib6_info *rt;
4436 struct rt6_nh *err_nh;
4437 struct rt6_nh *nh, *nh_safe;
4438 __u16 nlflags;
4439 int remaining;
4440 int attrlen;
4441 int err = 1;
4442 int nhn = 0;
4443 int replace = (cfg->fc_nlinfo.nlh &&
4444 (cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
4445 LIST_HEAD(rt6_nh_list);
4446
4447 nlflags = replace ? NLM_F_REPLACE : NLM_F_CREATE;
4448 if (info->nlh && info->nlh->nlmsg_flags & NLM_F_APPEND)
4449 nlflags |= NLM_F_APPEND;
4450
4451 remaining = cfg->fc_mp_len;
4452 rtnh = (struct rtnexthop *)cfg->fc_mp;
4453
4454
4455
4456
4457 while (rtnh_ok(rtnh, remaining)) {
4458 memcpy(&r_cfg, cfg, sizeof(*cfg));
4459 if (rtnh->rtnh_ifindex)
4460 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
4461
4462 attrlen = rtnh_attrlen(rtnh);
4463 if (attrlen > 0) {
4464 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
4465
4466 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
4467 if (nla) {
4468 r_cfg.fc_gateway = nla_get_in6_addr(nla);
4469 r_cfg.fc_flags |= RTF_GATEWAY;
4470 }
4471 r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
4472 nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
4473 if (nla)
4474 r_cfg.fc_encap_type = nla_get_u16(nla);
4475 }
4476
4477 r_cfg.fc_flags |= (rtnh->rtnh_flags & RTNH_F_ONLINK);
4478 rt = ip6_route_info_create(&r_cfg, GFP_KERNEL, extack);
4479 if (IS_ERR(rt)) {
4480 err = PTR_ERR(rt);
4481 rt = NULL;
4482 goto cleanup;
4483 }
4484 if (!rt6_qualify_for_ecmp(rt)) {
4485 err = -EINVAL;
4486 NL_SET_ERR_MSG(extack,
4487 "Device only routes can not be added for IPv6 using the multipath API.");
4488 fib6_info_release(rt);
4489 goto cleanup;
4490 }
4491
4492 rt->fib6_nh.fib_nh_weight = rtnh->rtnh_hops + 1;
4493
4494 err = ip6_route_info_append(info->nl_net, &rt6_nh_list,
4495 rt, &r_cfg);
4496 if (err) {
4497 fib6_info_release(rt);
4498 goto cleanup;
4499 }
4500
4501 rtnh = rtnh_next(rtnh, &remaining);
4502 }
4503
4504
4505
4506
4507
4508 info->skip_notify = 1;
4509
4510 err_nh = NULL;
4511 list_for_each_entry(nh, &rt6_nh_list, next) {
4512 err = __ip6_ins_rt(nh->fib6_info, info, extack);
4513 fib6_info_release(nh->fib6_info);
4514
4515 if (!err) {
4516
4517 rt_last = nh->fib6_info;
4518
4519
4520 if (!rt_notif)
4521 rt_notif = nh->fib6_info;
4522 }
4523
4524
4525 nh->fib6_info = NULL;
4526 if (err) {
4527 if (replace && nhn)
4528 NL_SET_ERR_MSG_MOD(extack,
4529 "multipath route replace failed (check consistency of installed routes)");
4530 err_nh = nh;
4531 goto add_errout;
4532 }
4533
4534
4535
4536
4537
4538
4539
4540
4541 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
4542 NLM_F_REPLACE);
4543 nhn++;
4544 }
4545
4546
4547 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
4548 goto cleanup;
4549
4550add_errout:
4551
4552
4553
4554
4555 if (rt_notif)
4556 ip6_route_mpath_notify(rt_notif, rt_last, info, nlflags);
4557
4558
4559 list_for_each_entry(nh, &rt6_nh_list, next) {
4560 if (err_nh == nh)
4561 break;
4562 ip6_route_del(&nh->r_cfg, extack);
4563 }
4564
4565cleanup:
4566 list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
4567 if (nh->fib6_info)
4568 fib6_info_release(nh->fib6_info);
4569 list_del(&nh->next);
4570 kfree(nh);
4571 }
4572
4573 return err;
4574}
4575
4576static int ip6_route_multipath_del(struct fib6_config *cfg,
4577 struct netlink_ext_ack *extack)
4578{
4579 struct fib6_config r_cfg;
4580 struct rtnexthop *rtnh;
4581 int remaining;
4582 int attrlen;
4583 int err = 1, last_err = 0;
4584
4585 remaining = cfg->fc_mp_len;
4586 rtnh = (struct rtnexthop *)cfg->fc_mp;
4587
4588
4589 while (rtnh_ok(rtnh, remaining)) {
4590 memcpy(&r_cfg, cfg, sizeof(*cfg));
4591 if (rtnh->rtnh_ifindex)
4592 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
4593
4594 attrlen = rtnh_attrlen(rtnh);
4595 if (attrlen > 0) {
4596 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
4597
4598 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
4599 if (nla) {
4600 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
4601 r_cfg.fc_flags |= RTF_GATEWAY;
4602 }
4603 }
4604 err = ip6_route_del(&r_cfg, extack);
4605 if (err)
4606 last_err = err;
4607
4608 rtnh = rtnh_next(rtnh, &remaining);
4609 }
4610
4611 return last_err;
4612}
4613
4614static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
4615 struct netlink_ext_ack *extack)
4616{
4617 struct fib6_config cfg;
4618 int err;
4619
4620 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
4621 if (err < 0)
4622 return err;
4623
4624 if (cfg.fc_mp)
4625 return ip6_route_multipath_del(&cfg, extack);
4626 else {
4627 cfg.fc_delete_all_nh = 1;
4628 return ip6_route_del(&cfg, extack);
4629 }
4630}
4631
4632static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
4633 struct netlink_ext_ack *extack)
4634{
4635 struct fib6_config cfg;
4636 int err;
4637
4638 err = rtm_to_fib6_config(skb, nlh, &cfg, extack);
4639 if (err < 0)
4640 return err;
4641
4642 if (cfg.fc_metric == 0)
4643 cfg.fc_metric = IP6_RT_PRIO_USER;
4644
4645 if (cfg.fc_mp)
4646 return ip6_route_multipath_add(&cfg, extack);
4647 else
4648 return ip6_route_add(&cfg, GFP_KERNEL, extack);
4649}
4650
4651static size_t rt6_nlmsg_size(struct fib6_info *rt)
4652{
4653 int nexthop_len = 0;
4654
4655 if (rt->fib6_nsiblings) {
4656 nexthop_len = nla_total_size(0)
4657 + NLA_ALIGN(sizeof(struct rtnexthop))
4658 + nla_total_size(16)
4659 + lwtunnel_get_encap_size(rt->fib6_nh.fib_nh_lws);
4660
4661 nexthop_len *= rt->fib6_nsiblings;
4662 }
4663
4664 return NLMSG_ALIGN(sizeof(struct rtmsg))
4665 + nla_total_size(16)
4666 + nla_total_size(16)
4667 + nla_total_size(16)
4668 + nla_total_size(16)
4669 + nla_total_size(4)
4670 + nla_total_size(4)
4671 + nla_total_size(4)
4672 + nla_total_size(4)
4673 + RTAX_MAX * nla_total_size(4)
4674 + nla_total_size(sizeof(struct rta_cacheinfo))
4675 + nla_total_size(TCP_CA_NAME_MAX)
4676 + nla_total_size(1)
4677 + lwtunnel_get_encap_size(rt->fib6_nh.fib_nh_lws)
4678 + nexthop_len;
4679}
4680
4681static int rt6_fill_node(struct net *net, struct sk_buff *skb,
4682 struct fib6_info *rt, struct dst_entry *dst,
4683 struct in6_addr *dest, struct in6_addr *src,
4684 int iif, int type, u32 portid, u32 seq,
4685 unsigned int flags)
4686{
4687 struct rt6_info *rt6 = (struct rt6_info *)dst;
4688 struct rt6key *rt6_dst, *rt6_src;
4689 u32 *pmetrics, table, rt6_flags;
4690 struct nlmsghdr *nlh;
4691 struct rtmsg *rtm;
4692 long expires = 0;
4693
4694 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
4695 if (!nlh)
4696 return -EMSGSIZE;
4697
4698 if (rt6) {
4699 rt6_dst = &rt6->rt6i_dst;
4700 rt6_src = &rt6->rt6i_src;
4701 rt6_flags = rt6->rt6i_flags;
4702 } else {
4703 rt6_dst = &rt->fib6_dst;
4704 rt6_src = &rt->fib6_src;
4705 rt6_flags = rt->fib6_flags;
4706 }
4707
4708 rtm = nlmsg_data(nlh);
4709 rtm->rtm_family = AF_INET6;
4710 rtm->rtm_dst_len = rt6_dst->plen;
4711 rtm->rtm_src_len = rt6_src->plen;
4712 rtm->rtm_tos = 0;
4713 if (rt->fib6_table)
4714 table = rt->fib6_table->tb6_id;
4715 else
4716 table = RT6_TABLE_UNSPEC;
4717 rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
4718 if (nla_put_u32(skb, RTA_TABLE, table))
4719 goto nla_put_failure;
4720
4721 rtm->rtm_type = rt->fib6_type;
4722 rtm->rtm_flags = 0;
4723 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
4724 rtm->rtm_protocol = rt->fib6_protocol;
4725
4726 if (rt6_flags & RTF_CACHE)
4727 rtm->rtm_flags |= RTM_F_CLONED;
4728
4729 if (dest) {
4730 if (nla_put_in6_addr(skb, RTA_DST, dest))
4731 goto nla_put_failure;
4732 rtm->rtm_dst_len = 128;
4733 } else if (rtm->rtm_dst_len)
4734 if (nla_put_in6_addr(skb, RTA_DST, &rt6_dst->addr))
4735 goto nla_put_failure;
4736#ifdef CONFIG_IPV6_SUBTREES
4737 if (src) {
4738 if (nla_put_in6_addr(skb, RTA_SRC, src))
4739 goto nla_put_failure;
4740 rtm->rtm_src_len = 128;
4741 } else if (rtm->rtm_src_len &&
4742 nla_put_in6_addr(skb, RTA_SRC, &rt6_src->addr))
4743 goto nla_put_failure;
4744#endif
4745 if (iif) {
4746#ifdef CONFIG_IPV6_MROUTE
4747 if (ipv6_addr_is_multicast(&rt6_dst->addr)) {
4748 int err = ip6mr_get_route(net, skb, rtm, portid);
4749
4750 if (err == 0)
4751 return 0;
4752 if (err < 0)
4753 goto nla_put_failure;
4754 } else
4755#endif
4756 if (nla_put_u32(skb, RTA_IIF, iif))
4757 goto nla_put_failure;
4758 } else if (dest) {
4759 struct in6_addr saddr_buf;
4760 if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
4761 nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
4762 goto nla_put_failure;
4763 }
4764
4765 if (rt->fib6_prefsrc.plen) {
4766 struct in6_addr saddr_buf;
4767 saddr_buf = rt->fib6_prefsrc.addr;
4768 if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
4769 goto nla_put_failure;
4770 }
4771
4772 pmetrics = dst ? dst_metrics_ptr(dst) : rt->fib6_metrics->metrics;
4773 if (rtnetlink_put_metrics(skb, pmetrics) < 0)
4774 goto nla_put_failure;
4775
4776 if (nla_put_u32(skb, RTA_PRIORITY, rt->fib6_metric))
4777 goto nla_put_failure;
4778
4779
4780
4781
4782 if (rt6) {
4783 if (rt6_flags & RTF_GATEWAY &&
4784 nla_put_in6_addr(skb, RTA_GATEWAY, &rt6->rt6i_gateway))
4785 goto nla_put_failure;
4786
4787 if (dst->dev && nla_put_u32(skb, RTA_OIF, dst->dev->ifindex))
4788 goto nla_put_failure;
4789 } else if (rt->fib6_nsiblings) {
4790 struct fib6_info *sibling, *next_sibling;
4791 struct nlattr *mp;
4792
4793 mp = nla_nest_start_noflag(skb, RTA_MULTIPATH);
4794 if (!mp)
4795 goto nla_put_failure;
4796
4797 if (fib_add_nexthop(skb, &rt->fib6_nh.nh_common,
4798 rt->fib6_nh.fib_nh_weight) < 0)
4799 goto nla_put_failure;
4800
4801 list_for_each_entry_safe(sibling, next_sibling,
4802 &rt->fib6_siblings, fib6_siblings) {
4803 if (fib_add_nexthop(skb, &sibling->fib6_nh.nh_common,
4804 sibling->fib6_nh.fib_nh_weight) < 0)
4805 goto nla_put_failure;
4806 }
4807
4808 nla_nest_end(skb, mp);
4809 } else {
4810 unsigned char nh_flags = 0;
4811
4812 if (fib_nexthop_info(skb, &rt->fib6_nh.nh_common,
4813 &nh_flags, false) < 0)
4814 goto nla_put_failure;
4815
4816 rtm->rtm_flags |= nh_flags;
4817 }
4818
4819 if (rt6_flags & RTF_EXPIRES) {
4820 expires = dst ? dst->expires : rt->expires;
4821 expires -= jiffies;
4822 }
4823
4824 if (rtnl_put_cacheinfo(skb, dst, 0, expires, dst ? dst->error : 0) < 0)
4825 goto nla_put_failure;
4826
4827 if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt6_flags)))
4828 goto nla_put_failure;
4829
4830
4831 nlmsg_end(skb, nlh);
4832 return 0;
4833
4834nla_put_failure:
4835 nlmsg_cancel(skb, nlh);
4836 return -EMSGSIZE;
4837}
4838
4839static bool fib6_info_uses_dev(const struct fib6_info *f6i,
4840 const struct net_device *dev)
4841{
4842 if (f6i->fib6_nh.fib_nh_dev == dev)
4843 return true;
4844
4845 if (f6i->fib6_nsiblings) {
4846 struct fib6_info *sibling, *next_sibling;
4847
4848 list_for_each_entry_safe(sibling, next_sibling,
4849 &f6i->fib6_siblings, fib6_siblings) {
4850 if (sibling->fib6_nh.fib_nh_dev == dev)
4851 return true;
4852 }
4853 }
4854
4855 return false;
4856}
4857
4858int rt6_dump_route(struct fib6_info *rt, void *p_arg)
4859{
4860 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
4861 struct fib_dump_filter *filter = &arg->filter;
4862 unsigned int flags = NLM_F_MULTI;
4863 struct net *net = arg->net;
4864
4865 if (rt == net->ipv6.fib6_null_entry)
4866 return 0;
4867
4868 if ((filter->flags & RTM_F_PREFIX) &&
4869 !(rt->fib6_flags & RTF_PREFIX_RT)) {
4870
4871 return 1;
4872 }
4873 if (filter->filter_set) {
4874 if ((filter->rt_type && rt->fib6_type != filter->rt_type) ||
4875 (filter->dev && !fib6_info_uses_dev(rt, filter->dev)) ||
4876 (filter->protocol && rt->fib6_protocol != filter->protocol)) {
4877 return 1;
4878 }
4879 flags |= NLM_F_DUMP_FILTERED;
4880 }
4881
4882 return rt6_fill_node(net, arg->skb, rt, NULL, NULL, NULL, 0,
4883 RTM_NEWROUTE, NETLINK_CB(arg->cb->skb).portid,
4884 arg->cb->nlh->nlmsg_seq, flags);
4885}
4886
4887static int inet6_rtm_valid_getroute_req(struct sk_buff *skb,
4888 const struct nlmsghdr *nlh,
4889 struct nlattr **tb,
4890 struct netlink_ext_ack *extack)
4891{
4892 struct rtmsg *rtm;
4893 int i, err;
4894
4895 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) {
4896 NL_SET_ERR_MSG_MOD(extack,
4897 "Invalid header for get route request");
4898 return -EINVAL;
4899 }
4900
4901 if (!netlink_strict_get_check(skb))
4902 return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX,
4903 rtm_ipv6_policy, extack);
4904
4905 rtm = nlmsg_data(nlh);
4906 if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
4907 (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
4908 rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope ||
4909 rtm->rtm_type) {
4910 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get route request");
4911 return -EINVAL;
4912 }
4913 if (rtm->rtm_flags & ~RTM_F_FIB_MATCH) {
4914 NL_SET_ERR_MSG_MOD(extack,
4915 "Invalid flags for get route request");
4916 return -EINVAL;
4917 }
4918
4919 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX,
4920 rtm_ipv6_policy, extack);
4921 if (err)
4922 return err;
4923
4924 if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
4925 (tb[RTA_DST] && !rtm->rtm_dst_len)) {
4926 NL_SET_ERR_MSG_MOD(extack, "rtm_src_len and rtm_dst_len must be 128 for IPv6");
4927 return -EINVAL;
4928 }
4929
4930 for (i = 0; i <= RTA_MAX; i++) {
4931 if (!tb[i])
4932 continue;
4933
4934 switch (i) {
4935 case RTA_SRC:
4936 case RTA_DST:
4937 case RTA_IIF:
4938 case RTA_OIF:
4939 case RTA_MARK:
4940 case RTA_UID:
4941 case RTA_SPORT:
4942 case RTA_DPORT:
4943 case RTA_IP_PROTO:
4944 break;
4945 default:
4946 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get route request");
4947 return -EINVAL;
4948 }
4949 }
4950
4951 return 0;
4952}
4953
4954static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4955 struct netlink_ext_ack *extack)
4956{
4957 struct net *net = sock_net(in_skb->sk);
4958 struct nlattr *tb[RTA_MAX+1];
4959 int err, iif = 0, oif = 0;
4960 struct fib6_info *from;
4961 struct dst_entry *dst;
4962 struct rt6_info *rt;
4963 struct sk_buff *skb;
4964 struct rtmsg *rtm;
4965 struct flowi6 fl6 = {};
4966 bool fibmatch;
4967
4968 err = inet6_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
4969 if (err < 0)
4970 goto errout;
4971
4972 err = -EINVAL;
4973 rtm = nlmsg_data(nlh);
4974 fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
4975 fibmatch = !!(rtm->rtm_flags & RTM_F_FIB_MATCH);
4976
4977 if (tb[RTA_SRC]) {
4978 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
4979 goto errout;
4980
4981 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
4982 }
4983
4984 if (tb[RTA_DST]) {
4985 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
4986 goto errout;
4987
4988 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
4989 }
4990
4991 if (tb[RTA_IIF])
4992 iif = nla_get_u32(tb[RTA_IIF]);
4993
4994 if (tb[RTA_OIF])
4995 oif = nla_get_u32(tb[RTA_OIF]);
4996
4997 if (tb[RTA_MARK])
4998 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
4999
5000 if (tb[RTA_UID])
5001 fl6.flowi6_uid = make_kuid(current_user_ns(),
5002 nla_get_u32(tb[RTA_UID]));
5003 else
5004 fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
5005
5006 if (tb[RTA_SPORT])
5007 fl6.fl6_sport = nla_get_be16(tb[RTA_SPORT]);
5008
5009 if (tb[RTA_DPORT])
5010 fl6.fl6_dport = nla_get_be16(tb[RTA_DPORT]);
5011
5012 if (tb[RTA_IP_PROTO]) {
5013 err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO],
5014 &fl6.flowi6_proto, AF_INET6,
5015 extack);
5016 if (err)
5017 goto errout;
5018 }
5019
5020 if (iif) {
5021 struct net_device *dev;
5022 int flags = 0;
5023
5024 rcu_read_lock();
5025
5026 dev = dev_get_by_index_rcu(net, iif);
5027 if (!dev) {
5028 rcu_read_unlock();
5029 err = -ENODEV;
5030 goto errout;
5031 }
5032
5033 fl6.flowi6_iif = iif;
5034
5035 if (!ipv6_addr_any(&fl6.saddr))
5036 flags |= RT6_LOOKUP_F_HAS_SADDR;
5037
5038 dst = ip6_route_input_lookup(net, dev, &fl6, NULL, flags);
5039
5040 rcu_read_unlock();
5041 } else {
5042 fl6.flowi6_oif = oif;
5043
5044 dst = ip6_route_output(net, NULL, &fl6);
5045 }
5046
5047
5048 rt = container_of(dst, struct rt6_info, dst);
5049 if (rt->dst.error) {
5050 err = rt->dst.error;
5051 ip6_rt_put(rt);
5052 goto errout;
5053 }
5054
5055 if (rt == net->ipv6.ip6_null_entry) {
5056 err = rt->dst.error;
5057 ip6_rt_put(rt);
5058 goto errout;
5059 }
5060
5061 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
5062 if (!skb) {
5063 ip6_rt_put(rt);
5064 err = -ENOBUFS;
5065 goto errout;
5066 }
5067
5068 skb_dst_set(skb, &rt->dst);
5069
5070 rcu_read_lock();
5071 from = rcu_dereference(rt->from);
5072 if (from) {
5073 if (fibmatch)
5074 err = rt6_fill_node(net, skb, from, NULL, NULL, NULL,
5075 iif, RTM_NEWROUTE,
5076 NETLINK_CB(in_skb).portid,
5077 nlh->nlmsg_seq, 0);
5078 else
5079 err = rt6_fill_node(net, skb, from, dst, &fl6.daddr,
5080 &fl6.saddr, iif, RTM_NEWROUTE,
5081 NETLINK_CB(in_skb).portid,
5082 nlh->nlmsg_seq, 0);
5083 } else {
5084 err = -ENETUNREACH;
5085 }
5086 rcu_read_unlock();
5087
5088 if (err < 0) {
5089 kfree_skb(skb);
5090 goto errout;
5091 }
5092
5093 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5094errout:
5095 return err;
5096}
5097
5098void inet6_rt_notify(int event, struct fib6_info *rt, struct nl_info *info,
5099 unsigned int nlm_flags)
5100{
5101 struct sk_buff *skb;
5102 struct net *net = info->nl_net;
5103 u32 seq;
5104 int err;
5105
5106 err = -ENOBUFS;
5107 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
5108
5109 skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
5110 if (!skb)
5111 goto errout;
5112
5113 err = rt6_fill_node(net, skb, rt, NULL, NULL, NULL, 0,
5114 event, info->portid, seq, nlm_flags);
5115 if (err < 0) {
5116
5117 WARN_ON(err == -EMSGSIZE);
5118 kfree_skb(skb);
5119 goto errout;
5120 }
5121 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
5122 info->nlh, gfp_any());
5123 return;
5124errout:
5125 if (err < 0)
5126 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
5127}
5128
5129static int ip6_route_dev_notify(struct notifier_block *this,
5130 unsigned long event, void *ptr)
5131{
5132 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
5133 struct net *net = dev_net(dev);
5134
5135 if (!(dev->flags & IFF_LOOPBACK))
5136 return NOTIFY_OK;
5137
5138 if (event == NETDEV_REGISTER) {
5139 net->ipv6.fib6_null_entry->fib6_nh.fib_nh_dev = dev;
5140 net->ipv6.ip6_null_entry->dst.dev = dev;
5141 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
5142#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5143 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
5144 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
5145 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
5146 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
5147#endif
5148 } else if (event == NETDEV_UNREGISTER &&
5149 dev->reg_state != NETREG_UNREGISTERED) {
5150
5151
5152
5153 in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
5154#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5155 in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
5156 in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
5157#endif
5158 }
5159
5160 return NOTIFY_OK;
5161}
5162
5163
5164
5165
5166
5167#ifdef CONFIG_PROC_FS
5168static int rt6_stats_seq_show(struct seq_file *seq, void *v)
5169{
5170 struct net *net = (struct net *)seq->private;
5171 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
5172 net->ipv6.rt6_stats->fib_nodes,
5173 net->ipv6.rt6_stats->fib_route_nodes,
5174 atomic_read(&net->ipv6.rt6_stats->fib_rt_alloc),
5175 net->ipv6.rt6_stats->fib_rt_entries,
5176 net->ipv6.rt6_stats->fib_rt_cache,
5177 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
5178 net->ipv6.rt6_stats->fib_discarded_routes);
5179
5180 return 0;
5181}
5182#endif
5183
5184#ifdef CONFIG_SYSCTL
5185
5186static
5187int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
5188 void __user *buffer, size_t *lenp, loff_t *ppos)
5189{
5190 struct net *net;
5191 int delay;
5192 int ret;
5193 if (!write)
5194 return -EINVAL;
5195
5196 net = (struct net *)ctl->extra1;
5197 delay = net->ipv6.sysctl.flush_delay;
5198 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5199 if (ret)
5200 return ret;
5201
5202 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
5203 return 0;
5204}
5205
5206static int zero;
5207static int one = 1;
5208
5209static struct ctl_table ipv6_route_table_template[] = {
5210 {
5211 .procname = "flush",
5212 .data = &init_net.ipv6.sysctl.flush_delay,
5213 .maxlen = sizeof(int),
5214 .mode = 0200,
5215 .proc_handler = ipv6_sysctl_rtcache_flush
5216 },
5217 {
5218 .procname = "gc_thresh",
5219 .data = &ip6_dst_ops_template.gc_thresh,
5220 .maxlen = sizeof(int),
5221 .mode = 0644,
5222 .proc_handler = proc_dointvec,
5223 },
5224 {
5225 .procname = "max_size",
5226 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
5227 .maxlen = sizeof(int),
5228 .mode = 0644,
5229 .proc_handler = proc_dointvec,
5230 },
5231 {
5232 .procname = "gc_min_interval",
5233 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
5234 .maxlen = sizeof(int),
5235 .mode = 0644,
5236 .proc_handler = proc_dointvec_jiffies,
5237 },
5238 {
5239 .procname = "gc_timeout",
5240 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
5241 .maxlen = sizeof(int),
5242 .mode = 0644,
5243 .proc_handler = proc_dointvec_jiffies,
5244 },
5245 {
5246 .procname = "gc_interval",
5247 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
5248 .maxlen = sizeof(int),
5249 .mode = 0644,
5250 .proc_handler = proc_dointvec_jiffies,
5251 },
5252 {
5253 .procname = "gc_elasticity",
5254 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
5255 .maxlen = sizeof(int),
5256 .mode = 0644,
5257 .proc_handler = proc_dointvec,
5258 },
5259 {
5260 .procname = "mtu_expires",
5261 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
5262 .maxlen = sizeof(int),
5263 .mode = 0644,
5264 .proc_handler = proc_dointvec_jiffies,
5265 },
5266 {
5267 .procname = "min_adv_mss",
5268 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
5269 .maxlen = sizeof(int),
5270 .mode = 0644,
5271 .proc_handler = proc_dointvec,
5272 },
5273 {
5274 .procname = "gc_min_interval_ms",
5275 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
5276 .maxlen = sizeof(int),
5277 .mode = 0644,
5278 .proc_handler = proc_dointvec_ms_jiffies,
5279 },
5280 {
5281 .procname = "skip_notify_on_dev_down",
5282 .data = &init_net.ipv6.sysctl.skip_notify_on_dev_down,
5283 .maxlen = sizeof(int),
5284 .mode = 0644,
5285 .proc_handler = proc_dointvec_minmax,
5286 .extra1 = &zero,
5287 .extra2 = &one,
5288 },
5289 { }
5290};
5291
5292struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
5293{
5294 struct ctl_table *table;
5295
5296 table = kmemdup(ipv6_route_table_template,
5297 sizeof(ipv6_route_table_template),
5298 GFP_KERNEL);
5299
5300 if (table) {
5301 table[0].data = &net->ipv6.sysctl.flush_delay;
5302 table[0].extra1 = net;
5303 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
5304 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
5305 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
5306 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
5307 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
5308 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
5309 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
5310 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
5311 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
5312 table[10].data = &net->ipv6.sysctl.skip_notify_on_dev_down;
5313
5314
5315 if (net->user_ns != &init_user_ns)
5316 table[0].procname = NULL;
5317 }
5318
5319 return table;
5320}
5321#endif
5322
5323static int __net_init ip6_route_net_init(struct net *net)
5324{
5325 int ret = -ENOMEM;
5326
5327 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
5328 sizeof(net->ipv6.ip6_dst_ops));
5329
5330 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
5331 goto out_ip6_dst_ops;
5332
5333 net->ipv6.fib6_null_entry = kmemdup(&fib6_null_entry_template,
5334 sizeof(*net->ipv6.fib6_null_entry),
5335 GFP_KERNEL);
5336 if (!net->ipv6.fib6_null_entry)
5337 goto out_ip6_dst_entries;
5338
5339 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
5340 sizeof(*net->ipv6.ip6_null_entry),
5341 GFP_KERNEL);
5342 if (!net->ipv6.ip6_null_entry)
5343 goto out_fib6_null_entry;
5344 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
5345 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
5346 ip6_template_metrics, true);
5347
5348#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5349 net->ipv6.fib6_has_custom_rules = false;
5350 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
5351 sizeof(*net->ipv6.ip6_prohibit_entry),
5352 GFP_KERNEL);
5353 if (!net->ipv6.ip6_prohibit_entry)
5354 goto out_ip6_null_entry;
5355 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
5356 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
5357 ip6_template_metrics, true);
5358
5359 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
5360 sizeof(*net->ipv6.ip6_blk_hole_entry),
5361 GFP_KERNEL);
5362 if (!net->ipv6.ip6_blk_hole_entry)
5363 goto out_ip6_prohibit_entry;
5364 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
5365 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
5366 ip6_template_metrics, true);
5367#endif
5368
5369 net->ipv6.sysctl.flush_delay = 0;
5370 net->ipv6.sysctl.ip6_rt_max_size = 4096;
5371 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
5372 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
5373 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
5374 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
5375 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
5376 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
5377 net->ipv6.sysctl.skip_notify_on_dev_down = 0;
5378
5379 net->ipv6.ip6_rt_gc_expire = 30*HZ;
5380
5381 ret = 0;
5382out:
5383 return ret;
5384
5385#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5386out_ip6_prohibit_entry:
5387 kfree(net->ipv6.ip6_prohibit_entry);
5388out_ip6_null_entry:
5389 kfree(net->ipv6.ip6_null_entry);
5390#endif
5391out_fib6_null_entry:
5392 kfree(net->ipv6.fib6_null_entry);
5393out_ip6_dst_entries:
5394 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
5395out_ip6_dst_ops:
5396 goto out;
5397}
5398
5399static void __net_exit ip6_route_net_exit(struct net *net)
5400{
5401 kfree(net->ipv6.fib6_null_entry);
5402 kfree(net->ipv6.ip6_null_entry);
5403#ifdef CONFIG_IPV6_MULTIPLE_TABLES
5404 kfree(net->ipv6.ip6_prohibit_entry);
5405 kfree(net->ipv6.ip6_blk_hole_entry);
5406#endif
5407 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
5408}
5409
5410static int __net_init ip6_route_net_init_late(struct net *net)
5411{
5412#ifdef CONFIG_PROC_FS
5413 proc_create_net("ipv6_route", 0, net->proc_net, &ipv6_route_seq_ops,
5414 sizeof(struct ipv6_route_iter));
5415 proc_create_net_single("rt6_stats", 0444, net->proc_net,
5416 rt6_stats_seq_show, NULL);
5417#endif
5418 return 0;
5419}
5420
5421static void __net_exit ip6_route_net_exit_late(struct net *net)
5422{
5423#ifdef CONFIG_PROC_FS
5424 remove_proc_entry("ipv6_route", net->proc_net);
5425 remove_proc_entry("rt6_stats", net->proc_net);
5426#endif
5427}
5428
5429static struct pernet_operations ip6_route_net_ops = {
5430 .init = ip6_route_net_init,
5431 .exit = ip6_route_net_exit,
5432};
5433
5434static int __net_init ipv6_inetpeer_init(struct net *net)
5435{
5436 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
5437
5438 if (!bp)
5439 return -ENOMEM;
5440 inet_peer_base_init(bp);
5441 net->ipv6.peers = bp;
5442 return 0;
5443}
5444
5445static void __net_exit ipv6_inetpeer_exit(struct net *net)
5446{
5447 struct inet_peer_base *bp = net->ipv6.peers;
5448
5449 net->ipv6.peers = NULL;
5450 inetpeer_invalidate_tree(bp);
5451 kfree(bp);
5452}
5453
5454static struct pernet_operations ipv6_inetpeer_ops = {
5455 .init = ipv6_inetpeer_init,
5456 .exit = ipv6_inetpeer_exit,
5457};
5458
5459static struct pernet_operations ip6_route_net_late_ops = {
5460 .init = ip6_route_net_init_late,
5461 .exit = ip6_route_net_exit_late,
5462};
5463
5464static struct notifier_block ip6_route_dev_notifier = {
5465 .notifier_call = ip6_route_dev_notify,
5466 .priority = ADDRCONF_NOTIFY_PRIORITY - 10,
5467};
5468
5469void __init ip6_route_init_special_entries(void)
5470{
5471
5472
5473
5474 init_net.ipv6.fib6_null_entry->fib6_nh.fib_nh_dev = init_net.loopback_dev;
5475 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
5476 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5477 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
5478 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
5479 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5480 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
5481 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
5482 #endif
5483}
5484
5485int __init ip6_route_init(void)
5486{
5487 int ret;
5488 int cpu;
5489
5490 ret = -ENOMEM;
5491 ip6_dst_ops_template.kmem_cachep =
5492 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
5493 SLAB_HWCACHE_ALIGN, NULL);
5494 if (!ip6_dst_ops_template.kmem_cachep)
5495 goto out;
5496
5497 ret = dst_entries_init(&ip6_dst_blackhole_ops);
5498 if (ret)
5499 goto out_kmem_cache;
5500
5501 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
5502 if (ret)
5503 goto out_dst_entries;
5504
5505 ret = register_pernet_subsys(&ip6_route_net_ops);
5506 if (ret)
5507 goto out_register_inetpeer;
5508
5509 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
5510
5511 ret = fib6_init();
5512 if (ret)
5513 goto out_register_subsys;
5514
5515 ret = xfrm6_init();
5516 if (ret)
5517 goto out_fib6_init;
5518
5519 ret = fib6_rules_init();
5520 if (ret)
5521 goto xfrm6_init;
5522
5523 ret = register_pernet_subsys(&ip6_route_net_late_ops);
5524 if (ret)
5525 goto fib6_rules_init;
5526
5527 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWROUTE,
5528 inet6_rtm_newroute, NULL, 0);
5529 if (ret < 0)
5530 goto out_register_late_subsys;
5531
5532 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELROUTE,
5533 inet6_rtm_delroute, NULL, 0);
5534 if (ret < 0)
5535 goto out_register_late_subsys;
5536
5537 ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE,
5538 inet6_rtm_getroute, NULL,
5539 RTNL_FLAG_DOIT_UNLOCKED);
5540 if (ret < 0)
5541 goto out_register_late_subsys;
5542
5543 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
5544 if (ret)
5545 goto out_register_late_subsys;
5546
5547 for_each_possible_cpu(cpu) {
5548 struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
5549
5550 INIT_LIST_HEAD(&ul->head);
5551 spin_lock_init(&ul->lock);
5552 }
5553
5554out:
5555 return ret;
5556
5557out_register_late_subsys:
5558 rtnl_unregister_all(PF_INET6);
5559 unregister_pernet_subsys(&ip6_route_net_late_ops);
5560fib6_rules_init:
5561 fib6_rules_cleanup();
5562xfrm6_init:
5563 xfrm6_fini();
5564out_fib6_init:
5565 fib6_gc_cleanup();
5566out_register_subsys:
5567 unregister_pernet_subsys(&ip6_route_net_ops);
5568out_register_inetpeer:
5569 unregister_pernet_subsys(&ipv6_inetpeer_ops);
5570out_dst_entries:
5571 dst_entries_destroy(&ip6_dst_blackhole_ops);
5572out_kmem_cache:
5573 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
5574 goto out;
5575}
5576
5577void ip6_route_cleanup(void)
5578{
5579 unregister_netdevice_notifier(&ip6_route_dev_notifier);
5580 unregister_pernet_subsys(&ip6_route_net_late_ops);
5581 fib6_rules_cleanup();
5582 xfrm6_fini();
5583 fib6_gc_cleanup();
5584 unregister_pernet_subsys(&ipv6_inetpeer_ops);
5585 unregister_pernet_subsys(&ip6_route_net_ops);
5586 dst_entries_destroy(&ip6_dst_blackhole_ops);
5587 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
5588}
5589