2 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
24 * Fixed routing subtrees.
27 #define pr_fmt(fmt) "IPv6: " fmt
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
55 #include <linux/rtnetlink.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
62 #include <asm/uaccess.h>
65 #include <linux/sysctl.h>
69 RT6_NUD_FAIL_HARD = -3,
70 RT6_NUD_FAIL_PROBE = -2,
71 RT6_NUD_FAIL_DO_RR = -1,
75 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
76 const struct in6_addr *dest);
77 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
78 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
79 static unsigned int ip6_mtu(const struct dst_entry *dst);
80 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
81 static void ip6_dst_destroy(struct dst_entry *);
82 static void ip6_dst_ifdown(struct dst_entry *,
83 struct net_device *dev, int how);
84 static int ip6_dst_gc(struct dst_ops *ops);
86 static int ip6_pkt_discard(struct sk_buff *skb);
87 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
88 static int ip6_pkt_prohibit(struct sk_buff *skb);
89 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
90 static void ip6_link_failure(struct sk_buff *skb);
91 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
92 struct sk_buff *skb, u32 mtu);
93 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
95 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
97 #ifdef CONFIG_IPV6_ROUTE_INFO
98 static struct rt6_info *rt6_add_route_info(struct net *net,
99 const struct in6_addr *prefix, int prefixlen,
100 const struct in6_addr *gwaddr, int ifindex,
102 static struct rt6_info *rt6_get_route_info(struct net *net,
103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, int ifindex);
107 static void rt6_bind_peer(struct rt6_info *rt, int create)
109 struct inet_peer_base *base;
110 struct inet_peer *peer;
112 base = inetpeer_base_ptr(rt->_rt6i_peer);
116 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
118 if (!rt6_set_peer(rt, peer))
123 static struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
125 if (rt6_has_peer(rt))
126 return rt6_peer_ptr(rt);
128 rt6_bind_peer(rt, create);
129 return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
132 static struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
134 return __rt6_get_peer(rt, 1);
137 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
139 struct rt6_info *rt = (struct rt6_info *) dst;
140 struct inet_peer *peer;
143 if (!(rt->dst.flags & DST_HOST))
146 peer = rt6_get_peer_create(rt);
148 u32 *old_p = __DST_METRICS_PTR(old);
149 unsigned long prev, new;
152 if (inet_metrics_new(peer) ||
153 (old & DST_METRICS_FORCE_OVERWRITE))
154 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
156 new = (unsigned long) p;
157 prev = cmpxchg(&dst->_metrics, old, new);
160 p = __DST_METRICS_PTR(prev);
161 if (prev & DST_METRICS_READ_ONLY)
168 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
172 struct in6_addr *p = &rt->rt6i_gateway;
174 if (!ipv6_addr_any(p))
175 return (const void *) p;
177 return &ipv6_hdr(skb)->daddr;
181 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
185 struct rt6_info *rt = (struct rt6_info *) dst;
188 daddr = choose_neigh_daddr(rt, skb, daddr);
189 n = __ipv6_neigh_lookup(dst->dev, daddr);
192 return neigh_create(&nd_tbl, daddr, dst->dev);
195 static struct dst_ops ip6_dst_ops_template = {
197 .protocol = cpu_to_be16(ETH_P_IPV6),
200 .check = ip6_dst_check,
201 .default_advmss = ip6_default_advmss,
203 .cow_metrics = ipv6_cow_metrics,
204 .destroy = ip6_dst_destroy,
205 .ifdown = ip6_dst_ifdown,
206 .negative_advice = ip6_negative_advice,
207 .link_failure = ip6_link_failure,
208 .update_pmtu = ip6_rt_update_pmtu,
209 .redirect = rt6_do_redirect,
210 .local_out = __ip6_local_out,
211 .neigh_lookup = ip6_neigh_lookup,
214 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
216 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
218 return mtu ? : dst->dev->mtu;
221 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
222 struct sk_buff *skb, u32 mtu)
226 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
231 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
237 static struct dst_ops ip6_dst_blackhole_ops = {
239 .protocol = cpu_to_be16(ETH_P_IPV6),
240 .destroy = ip6_dst_destroy,
241 .check = ip6_dst_check,
242 .mtu = ip6_blackhole_mtu,
243 .default_advmss = ip6_default_advmss,
244 .update_pmtu = ip6_rt_blackhole_update_pmtu,
245 .redirect = ip6_rt_blackhole_redirect,
246 .cow_metrics = ip6_rt_blackhole_cow_metrics,
247 .neigh_lookup = ip6_neigh_lookup,
250 static const u32 ip6_template_metrics[RTAX_MAX] = {
251 [RTAX_HOPLIMIT - 1] = 0,
254 static const struct rt6_info ip6_null_entry_template = {
256 .__refcnt = ATOMIC_INIT(1),
258 .obsolete = DST_OBSOLETE_FORCE_CHK,
259 .error = -ENETUNREACH,
260 .input = ip6_pkt_discard,
261 .output = ip6_pkt_discard_out,
263 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
264 .rt6i_protocol = RTPROT_KERNEL,
265 .rt6i_metric = ~(u32) 0,
266 .rt6i_ref = ATOMIC_INIT(1),
269 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
271 static const struct rt6_info ip6_prohibit_entry_template = {
273 .__refcnt = ATOMIC_INIT(1),
275 .obsolete = DST_OBSOLETE_FORCE_CHK,
277 .input = ip6_pkt_prohibit,
278 .output = ip6_pkt_prohibit_out,
280 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
281 .rt6i_protocol = RTPROT_KERNEL,
282 .rt6i_metric = ~(u32) 0,
283 .rt6i_ref = ATOMIC_INIT(1),
286 static const struct rt6_info ip6_blk_hole_entry_template = {
288 .__refcnt = ATOMIC_INIT(1),
290 .obsolete = DST_OBSOLETE_FORCE_CHK,
292 .input = dst_discard,
293 .output = dst_discard_sk,
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
296 .rt6i_protocol = RTPROT_KERNEL,
297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
303 /* allocate dst with ip6_dst_ops */
304 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
305 struct net_device *dev,
307 struct fib6_table *table)
309 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
310 0, DST_OBSOLETE_FORCE_CHK, flags);
313 struct dst_entry *dst = &rt->dst;
315 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
316 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
317 INIT_LIST_HEAD(&rt->rt6i_siblings);
322 static void ip6_dst_destroy(struct dst_entry *dst)
324 struct rt6_info *rt = (struct rt6_info *)dst;
325 struct inet6_dev *idev = rt->rt6i_idev;
326 struct dst_entry *from = dst->from;
328 if (!(rt->dst.flags & DST_HOST))
329 dst_destroy_metrics_generic(dst);
332 rt->rt6i_idev = NULL;
339 if (rt6_has_peer(rt)) {
340 struct inet_peer *peer = rt6_peer_ptr(rt);
345 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
348 struct rt6_info *rt = (struct rt6_info *)dst;
349 struct inet6_dev *idev = rt->rt6i_idev;
350 struct net_device *loopback_dev =
351 dev_net(dev)->loopback_dev;
353 if (dev != loopback_dev) {
354 if (idev && idev->dev == dev) {
355 struct inet6_dev *loopback_idev =
356 in6_dev_get(loopback_dev);
358 rt->rt6i_idev = loopback_idev;
365 static bool rt6_check_expired(const struct rt6_info *rt)
367 if (rt->rt6i_flags & RTF_EXPIRES) {
368 if (time_after(jiffies, rt->dst.expires))
370 } else if (rt->dst.from) {
371 return rt6_check_expired((struct rt6_info *) rt->dst.from);
376 /* Multipath route selection:
377 * Hash based function using packet header and flowlabel.
378 * Adapted from fib_info_hashfn()
380 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
381 const struct flowi6 *fl6)
383 unsigned int val = fl6->flowi6_proto;
385 val ^= ipv6_addr_hash(&fl6->daddr);
386 val ^= ipv6_addr_hash(&fl6->saddr);
388 /* Work only if this not encapsulated */
389 switch (fl6->flowi6_proto) {
393 val ^= (__force u16)fl6->fl6_sport;
394 val ^= (__force u16)fl6->fl6_dport;
398 val ^= (__force u16)fl6->fl6_icmp_type;
399 val ^= (__force u16)fl6->fl6_icmp_code;
402 /* RFC6438 recommands to use flowlabel */
403 val ^= (__force u32)fl6->flowlabel;
405 /* Perhaps, we need to tune, this function? */
406 val = val ^ (val >> 7) ^ (val >> 12);
407 return val % candidate_count;
410 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
411 struct flowi6 *fl6, int oif,
414 struct rt6_info *sibling, *next_sibling;
417 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
418 /* Don't change the route, if route_choosen == 0
419 * (siblings does not include ourself)
422 list_for_each_entry_safe(sibling, next_sibling,
423 &match->rt6i_siblings, rt6i_siblings) {
425 if (route_choosen == 0) {
426 if (rt6_score_route(sibling, oif, strict) < 0)
436 * Route lookup. Any table->tb6_lock is implied.
439 static inline struct rt6_info *rt6_device_match(struct net *net,
441 const struct in6_addr *saddr,
445 struct rt6_info *local = NULL;
446 struct rt6_info *sprt;
448 if (!oif && ipv6_addr_any(saddr))
451 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
452 struct net_device *dev = sprt->dst.dev;
455 if (dev->ifindex == oif)
457 if (dev->flags & IFF_LOOPBACK) {
458 if (!sprt->rt6i_idev ||
459 sprt->rt6i_idev->dev->ifindex != oif) {
460 if (flags & RT6_LOOKUP_F_IFACE && oif)
462 if (local && (!oif ||
463 local->rt6i_idev->dev->ifindex == oif))
469 if (ipv6_chk_addr(net, saddr, dev,
470 flags & RT6_LOOKUP_F_IFACE))
479 if (flags & RT6_LOOKUP_F_IFACE)
480 return net->ipv6.ip6_null_entry;
486 #ifdef CONFIG_IPV6_ROUTER_PREF
487 struct __rt6_probe_work {
488 struct work_struct work;
489 struct in6_addr target;
490 struct net_device *dev;
493 static void rt6_probe_deferred(struct work_struct *w)
495 struct in6_addr mcaddr;
496 struct __rt6_probe_work *work =
497 container_of(w, struct __rt6_probe_work, work);
499 addrconf_addr_solict_mult(&work->target, &mcaddr);
500 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
505 static void rt6_probe(struct rt6_info *rt)
507 struct neighbour *neigh;
509 * Okay, this does not seem to be appropriate
510 * for now, however, we need to check if it
511 * is really so; aka Router Reachability Probing.
513 * Router Reachability Probe MUST be rate-limited
514 * to no more than one per minute.
516 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
519 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
521 write_lock(&neigh->lock);
522 if (neigh->nud_state & NUD_VALID)
527 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
528 struct __rt6_probe_work *work;
530 work = kmalloc(sizeof(*work), GFP_ATOMIC);
533 __neigh_set_probe_once(neigh);
536 write_unlock(&neigh->lock);
539 INIT_WORK(&work->work, rt6_probe_deferred);
540 work->target = rt->rt6i_gateway;
541 dev_hold(rt->dst.dev);
542 work->dev = rt->dst.dev;
543 schedule_work(&work->work);
547 write_unlock(&neigh->lock);
549 rcu_read_unlock_bh();
552 static inline void rt6_probe(struct rt6_info *rt)
558 * Default Router Selection (RFC 2461 6.3.6)
560 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
562 struct net_device *dev = rt->dst.dev;
563 if (!oif || dev->ifindex == oif)
565 if ((dev->flags & IFF_LOOPBACK) &&
566 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
571 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
573 struct neighbour *neigh;
574 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
576 if (rt->rt6i_flags & RTF_NONEXTHOP ||
577 !(rt->rt6i_flags & RTF_GATEWAY))
578 return RT6_NUD_SUCCEED;
581 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
583 read_lock(&neigh->lock);
584 if (neigh->nud_state & NUD_VALID)
585 ret = RT6_NUD_SUCCEED;
586 #ifdef CONFIG_IPV6_ROUTER_PREF
587 else if (!(neigh->nud_state & NUD_FAILED))
588 ret = RT6_NUD_SUCCEED;
590 ret = RT6_NUD_FAIL_PROBE;
592 read_unlock(&neigh->lock);
594 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
595 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
597 rcu_read_unlock_bh();
602 static int rt6_score_route(struct rt6_info *rt, int oif,
607 m = rt6_check_dev(rt, oif);
608 if (!m && (strict & RT6_LOOKUP_F_IFACE))
609 return RT6_NUD_FAIL_HARD;
610 #ifdef CONFIG_IPV6_ROUTER_PREF
611 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
613 if (strict & RT6_LOOKUP_F_REACHABLE) {
614 int n = rt6_check_neigh(rt);
621 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
622 int *mpri, struct rt6_info *match,
626 bool match_do_rr = false;
628 if (rt6_check_expired(rt))
631 m = rt6_score_route(rt, oif, strict);
632 if (m == RT6_NUD_FAIL_DO_RR) {
634 m = 0; /* lowest valid score */
635 } else if (m == RT6_NUD_FAIL_HARD) {
639 if (strict & RT6_LOOKUP_F_REACHABLE)
642 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
644 *do_rr = match_do_rr;
652 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
653 struct rt6_info *rr_head,
654 u32 metric, int oif, int strict,
657 struct rt6_info *rt, *match;
661 for (rt = rr_head; rt && rt->rt6i_metric == metric;
662 rt = rt->dst.rt6_next)
663 match = find_match(rt, oif, strict, &mpri, match, do_rr);
664 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
665 rt = rt->dst.rt6_next)
666 match = find_match(rt, oif, strict, &mpri, match, do_rr);
671 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
673 struct rt6_info *match, *rt0;
679 fn->rr_ptr = rt0 = fn->leaf;
681 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
685 struct rt6_info *next = rt0->dst.rt6_next;
687 /* no entries matched; do round-robin */
688 if (!next || next->rt6i_metric != rt0->rt6i_metric)
695 net = dev_net(rt0->dst.dev);
696 return match ? match : net->ipv6.ip6_null_entry;
699 #ifdef CONFIG_IPV6_ROUTE_INFO
700 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
701 const struct in6_addr *gwaddr)
703 struct net *net = dev_net(dev);
704 struct route_info *rinfo = (struct route_info *) opt;
705 struct in6_addr prefix_buf, *prefix;
707 unsigned long lifetime;
710 if (len < sizeof(struct route_info)) {
714 /* Sanity check for prefix_len and length */
715 if (rinfo->length > 3) {
717 } else if (rinfo->prefix_len > 128) {
719 } else if (rinfo->prefix_len > 64) {
720 if (rinfo->length < 2) {
723 } else if (rinfo->prefix_len > 0) {
724 if (rinfo->length < 1) {
729 pref = rinfo->route_pref;
730 if (pref == ICMPV6_ROUTER_PREF_INVALID)
733 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
735 if (rinfo->length == 3)
736 prefix = (struct in6_addr *)rinfo->prefix;
738 /* this function is safe */
739 ipv6_addr_prefix(&prefix_buf,
740 (struct in6_addr *)rinfo->prefix,
742 prefix = &prefix_buf;
745 if (rinfo->prefix_len == 0)
746 rt = rt6_get_dflt_router(gwaddr, dev);
748 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
749 gwaddr, dev->ifindex);
751 if (rt && !lifetime) {
757 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
760 rt->rt6i_flags = RTF_ROUTEINFO |
761 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
764 if (!addrconf_finite_timeout(lifetime))
765 rt6_clean_expires(rt);
767 rt6_set_expires(rt, jiffies + HZ * lifetime);
775 static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
776 struct in6_addr *saddr)
778 struct fib6_node *pn;
780 if (fn->fn_flags & RTN_TL_ROOT)
783 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
784 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
787 if (fn->fn_flags & RTN_RTINFO)
792 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
793 struct fib6_table *table,
794 struct flowi6 *fl6, int flags)
796 struct fib6_node *fn;
799 read_lock_bh(&table->tb6_lock);
800 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
803 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
804 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
805 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
806 if (rt == net->ipv6.ip6_null_entry) {
807 fn = fib6_backtrack(fn, &fl6->saddr);
811 dst_use(&rt->dst, jiffies);
812 read_unlock_bh(&table->tb6_lock);
817 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
820 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
822 EXPORT_SYMBOL_GPL(ip6_route_lookup);
824 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
825 const struct in6_addr *saddr, int oif, int strict)
827 struct flowi6 fl6 = {
831 struct dst_entry *dst;
832 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
835 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
836 flags |= RT6_LOOKUP_F_HAS_SADDR;
839 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
841 return (struct rt6_info *) dst;
847 EXPORT_SYMBOL(rt6_lookup);
849 /* ip6_ins_rt is called with FREE table->tb6_lock.
850 It takes new route entry, the addition fails by any reason the
851 route is freed. In any case, if caller does not hold it, it may
855 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
856 struct nlattr *mx, int mx_len)
859 struct fib6_table *table;
861 table = rt->rt6i_table;
862 write_lock_bh(&table->tb6_lock);
863 err = fib6_add(&table->tb6_root, rt, info, mx, mx_len);
864 write_unlock_bh(&table->tb6_lock);
869 int ip6_ins_rt(struct rt6_info *rt)
871 struct nl_info info = {
872 .nl_net = dev_net(rt->dst.dev),
874 return __ip6_ins_rt(rt, &info, NULL, 0);
877 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
878 const struct in6_addr *daddr,
879 const struct in6_addr *saddr)
887 rt = ip6_rt_copy(ort, daddr);
890 if (ort->rt6i_dst.plen != 128 &&
891 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
892 rt->rt6i_flags |= RTF_ANYCAST;
894 rt->rt6i_flags |= RTF_CACHE;
896 #ifdef CONFIG_IPV6_SUBTREES
897 if (rt->rt6i_src.plen && saddr) {
898 rt->rt6i_src.addr = *saddr;
899 rt->rt6i_src.plen = 128;
907 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
908 const struct in6_addr *daddr)
910 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
913 rt->rt6i_flags |= RTF_CACHE;
917 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
918 struct flowi6 *fl6, int flags)
920 struct fib6_node *fn, *saved_fn;
921 struct rt6_info *rt, *nrt;
926 strict |= flags & RT6_LOOKUP_F_IFACE;
927 if (net->ipv6.devconf_all->forwarding == 0)
928 strict |= RT6_LOOKUP_F_REACHABLE;
930 redo_fib6_lookup_lock:
931 read_lock_bh(&table->tb6_lock);
933 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
937 rt = rt6_select(fn, oif, strict);
938 if (rt->rt6i_nsiblings)
939 rt = rt6_multipath_select(rt, fl6, oif, strict);
940 if (rt == net->ipv6.ip6_null_entry) {
941 fn = fib6_backtrack(fn, &fl6->saddr);
943 goto redo_rt6_select;
944 else if (strict & RT6_LOOKUP_F_REACHABLE) {
945 /* also consider unreachable route */
946 strict &= ~RT6_LOOKUP_F_REACHABLE;
948 goto redo_rt6_select;
951 read_unlock_bh(&table->tb6_lock);
957 read_unlock_bh(&table->tb6_lock);
959 if (rt->rt6i_flags & RTF_CACHE)
962 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
963 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
964 else if (!(rt->dst.flags & DST_HOST))
965 nrt = rt6_alloc_clone(rt, &fl6->daddr);
970 rt = nrt ? : net->ipv6.ip6_null_entry;
974 err = ip6_ins_rt(nrt);
983 * Race condition! In the gap, when table->tb6_lock was
984 * released someone could insert this route. Relookup.
987 goto redo_fib6_lookup_lock;
990 rt->dst.lastuse = jiffies;
996 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
997 struct flowi6 *fl6, int flags)
999 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
1002 static struct dst_entry *ip6_route_input_lookup(struct net *net,
1003 struct net_device *dev,
1004 struct flowi6 *fl6, int flags)
1006 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
1007 flags |= RT6_LOOKUP_F_IFACE;
1009 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1012 void ip6_route_input(struct sk_buff *skb)
1014 const struct ipv6hdr *iph = ipv6_hdr(skb);
1015 struct net *net = dev_net(skb->dev);
1016 int flags = RT6_LOOKUP_F_HAS_SADDR;
1017 struct flowi6 fl6 = {
1018 .flowi6_iif = skb->dev->ifindex,
1019 .daddr = iph->daddr,
1020 .saddr = iph->saddr,
1021 .flowlabel = ip6_flowinfo(iph),
1022 .flowi6_mark = skb->mark,
1023 .flowi6_proto = iph->nexthdr,
1026 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1029 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1030 struct flowi6 *fl6, int flags)
1032 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1035 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
1040 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1042 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1043 flags |= RT6_LOOKUP_F_IFACE;
1045 if (!ipv6_addr_any(&fl6->saddr))
1046 flags |= RT6_LOOKUP_F_HAS_SADDR;
1048 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1050 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1052 EXPORT_SYMBOL(ip6_route_output);
1054 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1056 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1057 struct dst_entry *new = NULL;
1059 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1063 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1064 rt6_init_peer(rt, net->ipv6.peers);
1067 new->input = dst_discard;
1068 new->output = dst_discard_sk;
1070 if (dst_metrics_read_only(&ort->dst))
1071 new->_metrics = ort->dst._metrics;
1073 dst_copy_metrics(new, &ort->dst);
1074 rt->rt6i_idev = ort->rt6i_idev;
1076 in6_dev_hold(rt->rt6i_idev);
1078 rt->rt6i_gateway = ort->rt6i_gateway;
1079 rt->rt6i_flags = ort->rt6i_flags;
1080 rt->rt6i_metric = 0;
1082 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1083 #ifdef CONFIG_IPV6_SUBTREES
1084 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1090 dst_release(dst_orig);
1091 return new ? new : ERR_PTR(-ENOMEM);
1095 * Destination cache support functions
1098 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1100 struct rt6_info *rt;
1102 rt = (struct rt6_info *) dst;
1104 /* All IPV6 dsts are created with ->obsolete set to the value
1105 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1106 * into this function always.
1108 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1111 if (rt6_check_expired(rt))
1117 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1119 struct rt6_info *rt = (struct rt6_info *) dst;
1122 if (rt->rt6i_flags & RTF_CACHE) {
1123 if (rt6_check_expired(rt)) {
1135 static void ip6_link_failure(struct sk_buff *skb)
1137 struct rt6_info *rt;
1139 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1141 rt = (struct rt6_info *) skb_dst(skb);
1143 if (rt->rt6i_flags & RTF_CACHE) {
1147 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1148 rt->rt6i_node->fn_sernum = -1;
1153 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1154 struct sk_buff *skb, u32 mtu)
1156 struct rt6_info *rt6 = (struct rt6_info *)dst;
1159 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1160 struct net *net = dev_net(dst->dev);
1162 rt6->rt6i_flags |= RTF_MODIFIED;
1163 if (mtu < IPV6_MIN_MTU)
1166 dst_metric_set(dst, RTAX_MTU, mtu);
1167 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1171 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1174 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1175 struct dst_entry *dst;
1178 memset(&fl6, 0, sizeof(fl6));
1179 fl6.flowi6_oif = oif;
1180 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
1181 fl6.daddr = iph->daddr;
1182 fl6.saddr = iph->saddr;
1183 fl6.flowlabel = ip6_flowinfo(iph);
1185 dst = ip6_route_output(net, NULL, &fl6);
1187 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1190 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1192 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1194 ip6_update_pmtu(skb, sock_net(sk), mtu,
1195 sk->sk_bound_dev_if, sk->sk_mark);
1197 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1199 /* Handle redirects */
1200 struct ip6rd_flowi {
1202 struct in6_addr gateway;
1205 static struct rt6_info *__ip6_route_redirect(struct net *net,
1206 struct fib6_table *table,
1210 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1211 struct rt6_info *rt;
1212 struct fib6_node *fn;
1214 /* Get the "current" route for this destination and
1215 * check if the redirect has come from approriate router.
1217 * RFC 4861 specifies that redirects should only be
1218 * accepted if they come from the nexthop to the target.
1219 * Due to the way the routes are chosen, this notion
1220 * is a bit fuzzy and one might need to check all possible
1224 read_lock_bh(&table->tb6_lock);
1225 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1227 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1228 if (rt6_check_expired(rt))
1232 if (!(rt->rt6i_flags & RTF_GATEWAY))
1234 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1236 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1242 rt = net->ipv6.ip6_null_entry;
1243 else if (rt->dst.error) {
1244 rt = net->ipv6.ip6_null_entry;
1245 } else if (rt == net->ipv6.ip6_null_entry) {
1246 fn = fib6_backtrack(fn, &fl6->saddr);
1253 read_unlock_bh(&table->tb6_lock);
1258 static struct dst_entry *ip6_route_redirect(struct net *net,
1259 const struct flowi6 *fl6,
1260 const struct in6_addr *gateway)
1262 int flags = RT6_LOOKUP_F_HAS_SADDR;
1263 struct ip6rd_flowi rdfl;
1266 rdfl.gateway = *gateway;
1268 return fib6_rule_lookup(net, &rdfl.fl6,
1269 flags, __ip6_route_redirect);
1272 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1274 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1275 struct dst_entry *dst;
1278 memset(&fl6, 0, sizeof(fl6));
1279 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1280 fl6.flowi6_oif = oif;
1281 fl6.flowi6_mark = mark;
1282 fl6.daddr = iph->daddr;
1283 fl6.saddr = iph->saddr;
1284 fl6.flowlabel = ip6_flowinfo(iph);
1286 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1287 rt6_do_redirect(dst, NULL, skb);
1290 EXPORT_SYMBOL_GPL(ip6_redirect);
1292 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1295 const struct ipv6hdr *iph = ipv6_hdr(skb);
1296 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1297 struct dst_entry *dst;
1300 memset(&fl6, 0, sizeof(fl6));
1301 fl6.flowi6_iif = LOOPBACK_IFINDEX;
1302 fl6.flowi6_oif = oif;
1303 fl6.flowi6_mark = mark;
1304 fl6.daddr = msg->dest;
1305 fl6.saddr = iph->daddr;
1307 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1308 rt6_do_redirect(dst, NULL, skb);
1312 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1314 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1316 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1318 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1320 struct net_device *dev = dst->dev;
1321 unsigned int mtu = dst_mtu(dst);
1322 struct net *net = dev_net(dev);
1324 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1326 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1327 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1330 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1331 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1332 * IPV6_MAXPLEN is also valid and means: "any MSS,
1333 * rely only on pmtu discovery"
1335 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1340 static unsigned int ip6_mtu(const struct dst_entry *dst)
1342 struct inet6_dev *idev;
1343 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1351 idev = __in6_dev_get(dst->dev);
1353 mtu = idev->cnf.mtu6;
1357 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1360 static struct dst_entry *icmp6_dst_gc_list;
1361 static DEFINE_SPINLOCK(icmp6_dst_lock);
1363 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1366 struct dst_entry *dst;
1367 struct rt6_info *rt;
1368 struct inet6_dev *idev = in6_dev_get(dev);
1369 struct net *net = dev_net(dev);
1371 if (unlikely(!idev))
1372 return ERR_PTR(-ENODEV);
1374 rt = ip6_dst_alloc(net, dev, 0, NULL);
1375 if (unlikely(!rt)) {
1377 dst = ERR_PTR(-ENOMEM);
1381 rt->dst.flags |= DST_HOST;
1382 rt->dst.output = ip6_output;
1383 atomic_set(&rt->dst.__refcnt, 1);
1384 rt->rt6i_gateway = fl6->daddr;
1385 rt->rt6i_dst.addr = fl6->daddr;
1386 rt->rt6i_dst.plen = 128;
1387 rt->rt6i_idev = idev;
1388 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1390 spin_lock_bh(&icmp6_dst_lock);
1391 rt->dst.next = icmp6_dst_gc_list;
1392 icmp6_dst_gc_list = &rt->dst;
1393 spin_unlock_bh(&icmp6_dst_lock);
1395 fib6_force_start_gc(net);
1397 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1403 int icmp6_dst_gc(void)
1405 struct dst_entry *dst, **pprev;
1408 spin_lock_bh(&icmp6_dst_lock);
1409 pprev = &icmp6_dst_gc_list;
1411 while ((dst = *pprev) != NULL) {
1412 if (!atomic_read(&dst->__refcnt)) {
1421 spin_unlock_bh(&icmp6_dst_lock);
1426 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1429 struct dst_entry *dst, **pprev;
1431 spin_lock_bh(&icmp6_dst_lock);
1432 pprev = &icmp6_dst_gc_list;
1433 while ((dst = *pprev) != NULL) {
1434 struct rt6_info *rt = (struct rt6_info *) dst;
1435 if (func(rt, arg)) {
1442 spin_unlock_bh(&icmp6_dst_lock);
1445 static int ip6_dst_gc(struct dst_ops *ops)
1447 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1448 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1449 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1450 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1451 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1452 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1455 entries = dst_entries_get_fast(ops);
1456 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1457 entries <= rt_max_size)
1460 net->ipv6.ip6_rt_gc_expire++;
1461 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
1462 entries = dst_entries_get_slow(ops);
1463 if (entries < ops->gc_thresh)
1464 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1466 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1467 return entries > rt_max_size;
1474 int ip6_route_add(struct fib6_config *cfg)
1477 struct net *net = cfg->fc_nlinfo.nl_net;
1478 struct rt6_info *rt = NULL;
1479 struct net_device *dev = NULL;
1480 struct inet6_dev *idev = NULL;
1481 struct fib6_table *table;
1484 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1486 #ifndef CONFIG_IPV6_SUBTREES
1487 if (cfg->fc_src_len)
1490 if (cfg->fc_ifindex) {
1492 dev = dev_get_by_index(net, cfg->fc_ifindex);
1495 idev = in6_dev_get(dev);
1500 if (cfg->fc_metric == 0)
1501 cfg->fc_metric = IP6_RT_PRIO_USER;
1504 if (cfg->fc_nlinfo.nlh &&
1505 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1506 table = fib6_get_table(net, cfg->fc_table);
1508 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1509 table = fib6_new_table(net, cfg->fc_table);
1512 table = fib6_new_table(net, cfg->fc_table);
1518 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1525 if (cfg->fc_flags & RTF_EXPIRES)
1526 rt6_set_expires(rt, jiffies +
1527 clock_t_to_jiffies(cfg->fc_expires));
1529 rt6_clean_expires(rt);
1531 if (cfg->fc_protocol == RTPROT_UNSPEC)
1532 cfg->fc_protocol = RTPROT_BOOT;
1533 rt->rt6i_protocol = cfg->fc_protocol;
1535 addr_type = ipv6_addr_type(&cfg->fc_dst);
1537 if (addr_type & IPV6_ADDR_MULTICAST)
1538 rt->dst.input = ip6_mc_input;
1539 else if (cfg->fc_flags & RTF_LOCAL)
1540 rt->dst.input = ip6_input;
1542 rt->dst.input = ip6_forward;
1544 rt->dst.output = ip6_output;
1546 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1547 rt->rt6i_dst.plen = cfg->fc_dst_len;
1548 if (rt->rt6i_dst.plen == 128) {
1549 rt->dst.flags |= DST_HOST;
1550 dst_metrics_set_force_overwrite(&rt->dst);
1553 #ifdef CONFIG_IPV6_SUBTREES
1554 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1555 rt->rt6i_src.plen = cfg->fc_src_len;
1558 rt->rt6i_metric = cfg->fc_metric;
1560 /* We cannot add true routes via loopback here,
1561 they would result in kernel looping; promote them to reject routes
1563 if ((cfg->fc_flags & RTF_REJECT) ||
1564 (dev && (dev->flags & IFF_LOOPBACK) &&
1565 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1566 !(cfg->fc_flags & RTF_LOCAL))) {
1567 /* hold loopback dev/idev if we haven't done so. */
1568 if (dev != net->loopback_dev) {
1573 dev = net->loopback_dev;
1575 idev = in6_dev_get(dev);
1581 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1582 switch (cfg->fc_type) {
1584 rt->dst.error = -EINVAL;
1585 rt->dst.output = dst_discard_sk;
1586 rt->dst.input = dst_discard;
1589 rt->dst.error = -EACCES;
1590 rt->dst.output = ip6_pkt_prohibit_out;
1591 rt->dst.input = ip6_pkt_prohibit;
1595 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1597 rt->dst.output = ip6_pkt_discard_out;
1598 rt->dst.input = ip6_pkt_discard;
1604 if (cfg->fc_flags & RTF_GATEWAY) {
1605 const struct in6_addr *gw_addr;
1608 gw_addr = &cfg->fc_gateway;
1609 rt->rt6i_gateway = *gw_addr;
1610 gwa_type = ipv6_addr_type(gw_addr);
1612 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1613 struct rt6_info *grt;
1615 /* IPv6 strictly inhibits using not link-local
1616 addresses as nexthop address.
1617 Otherwise, router will not able to send redirects.
1618 It is very good, but in some (rare!) circumstances
1619 (SIT, PtP, NBMA NOARP links) it is handy to allow
1620 some exceptions. --ANK
1623 if (!(gwa_type & IPV6_ADDR_UNICAST))
1626 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1628 err = -EHOSTUNREACH;
1632 if (dev != grt->dst.dev) {
1638 idev = grt->rt6i_idev;
1640 in6_dev_hold(grt->rt6i_idev);
1642 if (!(grt->rt6i_flags & RTF_GATEWAY))
1650 if (!dev || (dev->flags & IFF_LOOPBACK))
1658 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1659 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1663 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1664 rt->rt6i_prefsrc.plen = 128;
1666 rt->rt6i_prefsrc.plen = 0;
1668 rt->rt6i_flags = cfg->fc_flags;
1672 rt->rt6i_idev = idev;
1673 rt->rt6i_table = table;
1675 cfg->fc_nlinfo.nl_net = dev_net(dev);
1677 return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
1689 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1692 struct fib6_table *table;
1693 struct net *net = dev_net(rt->dst.dev);
1695 if (rt == net->ipv6.ip6_null_entry) {
1700 table = rt->rt6i_table;
1701 write_lock_bh(&table->tb6_lock);
1702 err = fib6_del(rt, info);
1703 write_unlock_bh(&table->tb6_lock);
1710 int ip6_del_rt(struct rt6_info *rt)
1712 struct nl_info info = {
1713 .nl_net = dev_net(rt->dst.dev),
1715 return __ip6_del_rt(rt, &info);
1718 static int ip6_route_del(struct fib6_config *cfg)
1720 struct fib6_table *table;
1721 struct fib6_node *fn;
1722 struct rt6_info *rt;
1725 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1729 read_lock_bh(&table->tb6_lock);
1731 fn = fib6_locate(&table->tb6_root,
1732 &cfg->fc_dst, cfg->fc_dst_len,
1733 &cfg->fc_src, cfg->fc_src_len);
1736 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1737 if (cfg->fc_ifindex &&
1739 rt->dst.dev->ifindex != cfg->fc_ifindex))
1741 if (cfg->fc_flags & RTF_GATEWAY &&
1742 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1744 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1747 read_unlock_bh(&table->tb6_lock);
1749 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1752 read_unlock_bh(&table->tb6_lock);
1757 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1759 struct net *net = dev_net(skb->dev);
1760 struct netevent_redirect netevent;
1761 struct rt6_info *rt, *nrt = NULL;
1762 struct ndisc_options ndopts;
1763 struct inet6_dev *in6_dev;
1764 struct neighbour *neigh;
1766 int optlen, on_link;
1769 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1770 optlen -= sizeof(*msg);
1773 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1777 msg = (struct rd_msg *)icmp6_hdr(skb);
1779 if (ipv6_addr_is_multicast(&msg->dest)) {
1780 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1785 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1787 } else if (ipv6_addr_type(&msg->target) !=
1788 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1789 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1793 in6_dev = __in6_dev_get(skb->dev);
1796 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1800 * The IP source address of the Redirect MUST be the same as the current
1801 * first-hop router for the specified ICMP Destination Address.
1804 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1805 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1810 if (ndopts.nd_opts_tgt_lladdr) {
1811 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1814 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1819 rt = (struct rt6_info *) dst;
1820 if (rt == net->ipv6.ip6_null_entry) {
1821 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1825 /* Redirect received -> path was valid.
1826 * Look, redirects are sent only in response to data packets,
1827 * so that this nexthop apparently is reachable. --ANK
1829 dst_confirm(&rt->dst);
1831 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1836 * We have finally decided to accept it.
1839 neigh_update(neigh, lladdr, NUD_STALE,
1840 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1841 NEIGH_UPDATE_F_OVERRIDE|
1842 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1843 NEIGH_UPDATE_F_ISROUTER))
1846 nrt = ip6_rt_copy(rt, &msg->dest);
1850 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1852 nrt->rt6i_flags &= ~RTF_GATEWAY;
1854 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1856 if (ip6_ins_rt(nrt))
1859 netevent.old = &rt->dst;
1860 netevent.new = &nrt->dst;
1861 netevent.daddr = &msg->dest;
1862 netevent.neigh = neigh;
1863 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1865 if (rt->rt6i_flags & RTF_CACHE) {
1866 rt = (struct rt6_info *) dst_clone(&rt->dst);
1871 neigh_release(neigh);
1875 * Misc support functions
1878 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1879 const struct in6_addr *dest)
1881 struct net *net = dev_net(ort->dst.dev);
1882 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1886 rt->dst.input = ort->dst.input;
1887 rt->dst.output = ort->dst.output;
1888 rt->dst.flags |= DST_HOST;
1890 rt->rt6i_dst.addr = *dest;
1891 rt->rt6i_dst.plen = 128;
1892 dst_copy_metrics(&rt->dst, &ort->dst);
1893 rt->dst.error = ort->dst.error;
1894 rt->rt6i_idev = ort->rt6i_idev;
1896 in6_dev_hold(rt->rt6i_idev);
1897 rt->dst.lastuse = jiffies;
1899 if (ort->rt6i_flags & RTF_GATEWAY)
1900 rt->rt6i_gateway = ort->rt6i_gateway;
1902 rt->rt6i_gateway = *dest;
1903 rt->rt6i_flags = ort->rt6i_flags;
1904 rt6_set_from(rt, ort);
1905 rt->rt6i_metric = 0;
1907 #ifdef CONFIG_IPV6_SUBTREES
1908 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1910 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1911 rt->rt6i_table = ort->rt6i_table;
1916 #ifdef CONFIG_IPV6_ROUTE_INFO
1917 static struct rt6_info *rt6_get_route_info(struct net *net,
1918 const struct in6_addr *prefix, int prefixlen,
1919 const struct in6_addr *gwaddr, int ifindex)
1921 struct fib6_node *fn;
1922 struct rt6_info *rt = NULL;
1923 struct fib6_table *table;
1925 table = fib6_get_table(net, RT6_TABLE_INFO);
1929 read_lock_bh(&table->tb6_lock);
1930 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
1934 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1935 if (rt->dst.dev->ifindex != ifindex)
1937 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1939 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1945 read_unlock_bh(&table->tb6_lock);
1949 static struct rt6_info *rt6_add_route_info(struct net *net,
1950 const struct in6_addr *prefix, int prefixlen,
1951 const struct in6_addr *gwaddr, int ifindex,
1954 struct fib6_config cfg = {
1955 .fc_table = RT6_TABLE_INFO,
1956 .fc_metric = IP6_RT_PRIO_USER,
1957 .fc_ifindex = ifindex,
1958 .fc_dst_len = prefixlen,
1959 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1960 RTF_UP | RTF_PREF(pref),
1961 .fc_nlinfo.portid = 0,
1962 .fc_nlinfo.nlh = NULL,
1963 .fc_nlinfo.nl_net = net,
1966 cfg.fc_dst = *prefix;
1967 cfg.fc_gateway = *gwaddr;
1969 /* We should treat it as a default route if prefix length is 0. */
1971 cfg.fc_flags |= RTF_DEFAULT;
1973 ip6_route_add(&cfg);
1975 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1979 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1981 struct rt6_info *rt;
1982 struct fib6_table *table;
1984 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1988 read_lock_bh(&table->tb6_lock);
1989 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1990 if (dev == rt->dst.dev &&
1991 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1992 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1997 read_unlock_bh(&table->tb6_lock);
2001 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2002 struct net_device *dev,
2005 struct fib6_config cfg = {
2006 .fc_table = RT6_TABLE_DFLT,
2007 .fc_metric = IP6_RT_PRIO_USER,
2008 .fc_ifindex = dev->ifindex,
2009 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2010 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2011 .fc_nlinfo.portid = 0,
2012 .fc_nlinfo.nlh = NULL,
2013 .fc_nlinfo.nl_net = dev_net(dev),
2016 cfg.fc_gateway = *gwaddr;
2018 ip6_route_add(&cfg);
2020 return rt6_get_dflt_router(gwaddr, dev);
2023 void rt6_purge_dflt_routers(struct net *net)
2025 struct rt6_info *rt;
2026 struct fib6_table *table;
2028 /* NOTE: Keep consistent with rt6_get_dflt_router */
2029 table = fib6_get_table(net, RT6_TABLE_DFLT);
2034 read_lock_bh(&table->tb6_lock);
2035 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2036 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2037 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2039 read_unlock_bh(&table->tb6_lock);
2044 read_unlock_bh(&table->tb6_lock);
2047 static void rtmsg_to_fib6_config(struct net *net,
2048 struct in6_rtmsg *rtmsg,
2049 struct fib6_config *cfg)
2051 memset(cfg, 0, sizeof(*cfg));
2053 cfg->fc_table = RT6_TABLE_MAIN;
2054 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2055 cfg->fc_metric = rtmsg->rtmsg_metric;
2056 cfg->fc_expires = rtmsg->rtmsg_info;
2057 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2058 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2059 cfg->fc_flags = rtmsg->rtmsg_flags;
2061 cfg->fc_nlinfo.nl_net = net;
2063 cfg->fc_dst = rtmsg->rtmsg_dst;
2064 cfg->fc_src = rtmsg->rtmsg_src;
2065 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2068 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2070 struct fib6_config cfg;
2071 struct in6_rtmsg rtmsg;
2075 case SIOCADDRT: /* Add a route */
2076 case SIOCDELRT: /* Delete a route */
2077 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2079 err = copy_from_user(&rtmsg, arg,
2080 sizeof(struct in6_rtmsg));
2084 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2089 err = ip6_route_add(&cfg);
2092 err = ip6_route_del(&cfg);
2106 * Drop the packet on the floor
2109 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2112 struct dst_entry *dst = skb_dst(skb);
2113 switch (ipstats_mib_noroutes) {
2114 case IPSTATS_MIB_INNOROUTES:
2115 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2116 if (type == IPV6_ADDR_ANY) {
2117 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2118 IPSTATS_MIB_INADDRERRORS);
2122 case IPSTATS_MIB_OUTNOROUTES:
2123 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2124 ipstats_mib_noroutes);
2127 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2132 static int ip6_pkt_discard(struct sk_buff *skb)
2134 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2137 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2139 skb->dev = skb_dst(skb)->dev;
2140 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2143 static int ip6_pkt_prohibit(struct sk_buff *skb)
2145 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2148 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2150 skb->dev = skb_dst(skb)->dev;
2151 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2155 * Allocate a dst for local (unicast / anycast) address.
2158 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2159 const struct in6_addr *addr,
2162 struct net *net = dev_net(idev->dev);
2163 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2166 return ERR_PTR(-ENOMEM);
2170 rt->dst.flags |= DST_HOST;
2171 rt->dst.input = ip6_input;
2172 rt->dst.output = ip6_output;
2173 rt->rt6i_idev = idev;
2175 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2177 rt->rt6i_flags |= RTF_ANYCAST;
2179 rt->rt6i_flags |= RTF_LOCAL;
2181 rt->rt6i_gateway = *addr;
2182 rt->rt6i_dst.addr = *addr;
2183 rt->rt6i_dst.plen = 128;
2184 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2186 atomic_set(&rt->dst.__refcnt, 1);
2191 int ip6_route_get_saddr(struct net *net,
2192 struct rt6_info *rt,
2193 const struct in6_addr *daddr,
2195 struct in6_addr *saddr)
2197 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt);
2199 if (rt->rt6i_prefsrc.plen)
2200 *saddr = rt->rt6i_prefsrc.addr;
2202 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2203 daddr, prefs, saddr);
2207 /* remove deleted ip from prefsrc entries */
2208 struct arg_dev_net_ip {
2209 struct net_device *dev;
2211 struct in6_addr *addr;
2214 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2216 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2217 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2218 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2220 if (((void *)rt->dst.dev == dev || !dev) &&
2221 rt != net->ipv6.ip6_null_entry &&
2222 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2223 /* remove prefsrc entry */
2224 rt->rt6i_prefsrc.plen = 0;
2229 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2231 struct net *net = dev_net(ifp->idev->dev);
2232 struct arg_dev_net_ip adni = {
2233 .dev = ifp->idev->dev,
2237 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2240 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2241 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2243 /* Remove routers and update dst entries when gateway turn into host. */
2244 static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
2246 struct in6_addr *gateway = (struct in6_addr *)arg;
2248 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
2249 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
2250 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
2256 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
2258 fib6_clean_all(net, fib6_clean_tohost, gateway);
2261 struct arg_dev_net {
2262 struct net_device *dev;
2266 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2268 const struct arg_dev_net *adn = arg;
2269 const struct net_device *dev = adn->dev;
2271 if ((rt->dst.dev == dev || !dev) &&
2272 rt != adn->net->ipv6.ip6_null_entry)
2278 void rt6_ifdown(struct net *net, struct net_device *dev)
2280 struct arg_dev_net adn = {
2285 fib6_clean_all(net, fib6_ifdown, &adn);
2286 icmp6_clean_all(fib6_ifdown, &adn);
2289 struct rt6_mtu_change_arg {
2290 struct net_device *dev;
2294 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2296 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2297 struct inet6_dev *idev;
2299 /* In IPv6 pmtu discovery is not optional,
2300 so that RTAX_MTU lock cannot disable it.
2301 We still use this lock to block changes
2302 caused by addrconf/ndisc.
2305 idev = __in6_dev_get(arg->dev);
2309 /* For administrative MTU increase, there is no way to discover
2310 IPv6 PMTU increase, so PMTU increase should be updated here.
2311 Since RFC 1981 doesn't include administrative MTU increase
2312 update PMTU increase is a MUST. (i.e. jumbo frame)
2315 If new MTU is less than route PMTU, this new MTU will be the
2316 lowest MTU in the path, update the route PMTU to reflect PMTU
2317 decreases; if new MTU is greater than route PMTU, and the
2318 old MTU is the lowest MTU in the path, update the route PMTU
2319 to reflect the increase. In this case if the other nodes' MTU
2320 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2323 if (rt->dst.dev == arg->dev &&
2324 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2325 (dst_mtu(&rt->dst) >= arg->mtu ||
2326 (dst_mtu(&rt->dst) < arg->mtu &&
2327 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2328 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2333 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2335 struct rt6_mtu_change_arg arg = {
2340 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2343 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2344 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2345 [RTA_OIF] = { .type = NLA_U32 },
2346 [RTA_IIF] = { .type = NLA_U32 },
2347 [RTA_PRIORITY] = { .type = NLA_U32 },
2348 [RTA_METRICS] = { .type = NLA_NESTED },
2349 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2352 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2353 struct fib6_config *cfg)
2356 struct nlattr *tb[RTA_MAX+1];
2359 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2364 rtm = nlmsg_data(nlh);
2365 memset(cfg, 0, sizeof(*cfg));
2367 cfg->fc_table = rtm->rtm_table;
2368 cfg->fc_dst_len = rtm->rtm_dst_len;
2369 cfg->fc_src_len = rtm->rtm_src_len;
2370 cfg->fc_flags = RTF_UP;
2371 cfg->fc_protocol = rtm->rtm_protocol;
2372 cfg->fc_type = rtm->rtm_type;
2374 if (rtm->rtm_type == RTN_UNREACHABLE ||
2375 rtm->rtm_type == RTN_BLACKHOLE ||
2376 rtm->rtm_type == RTN_PROHIBIT ||
2377 rtm->rtm_type == RTN_THROW)
2378 cfg->fc_flags |= RTF_REJECT;
2380 if (rtm->rtm_type == RTN_LOCAL)
2381 cfg->fc_flags |= RTF_LOCAL;
2383 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2384 cfg->fc_nlinfo.nlh = nlh;
2385 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2387 if (tb[RTA_GATEWAY]) {
2388 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2389 cfg->fc_flags |= RTF_GATEWAY;
2393 int plen = (rtm->rtm_dst_len + 7) >> 3;
2395 if (nla_len(tb[RTA_DST]) < plen)
2398 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2402 int plen = (rtm->rtm_src_len + 7) >> 3;
2404 if (nla_len(tb[RTA_SRC]) < plen)
2407 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2410 if (tb[RTA_PREFSRC])
2411 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2414 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2416 if (tb[RTA_PRIORITY])
2417 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2419 if (tb[RTA_METRICS]) {
2420 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2421 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2425 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2427 if (tb[RTA_MULTIPATH]) {
2428 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2429 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2437 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2439 struct fib6_config r_cfg;
2440 struct rtnexthop *rtnh;
2443 int err = 0, last_err = 0;
2446 rtnh = (struct rtnexthop *)cfg->fc_mp;
2447 remaining = cfg->fc_mp_len;
2449 /* Parse a Multipath Entry */
2450 while (rtnh_ok(rtnh, remaining)) {
2451 memcpy(&r_cfg, cfg, sizeof(*cfg));
2452 if (rtnh->rtnh_ifindex)
2453 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2455 attrlen = rtnh_attrlen(rtnh);
2457 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2459 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2461 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2462 r_cfg.fc_flags |= RTF_GATEWAY;
2465 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2468 /* If we are trying to remove a route, do not stop the
2469 * loop when ip6_route_del() fails (because next hop is
2470 * already gone), we should try to remove all next hops.
2473 /* If add fails, we should try to delete all
2474 * next hops that have been already added.
2480 /* Because each route is added like a single route we remove
2481 * this flag after the first nexthop (if there is a collision,
2482 * we have already fail to add the first nexthop:
2483 * fib6_add_rt2node() has reject it).
2485 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2486 rtnh = rtnh_next(rtnh, &remaining);
2492 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2494 struct fib6_config cfg;
2497 err = rtm_to_fib6_config(skb, nlh, &cfg);
2502 return ip6_route_multipath(&cfg, 0);
2504 return ip6_route_del(&cfg);
2507 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
2509 struct fib6_config cfg;
2512 err = rtm_to_fib6_config(skb, nlh, &cfg);
2517 return ip6_route_multipath(&cfg, 1);
2519 return ip6_route_add(&cfg);
2522 static inline size_t rt6_nlmsg_size(void)
2524 return NLMSG_ALIGN(sizeof(struct rtmsg))
2525 + nla_total_size(16) /* RTA_SRC */
2526 + nla_total_size(16) /* RTA_DST */
2527 + nla_total_size(16) /* RTA_GATEWAY */
2528 + nla_total_size(16) /* RTA_PREFSRC */
2529 + nla_total_size(4) /* RTA_TABLE */
2530 + nla_total_size(4) /* RTA_IIF */
2531 + nla_total_size(4) /* RTA_OIF */
2532 + nla_total_size(4) /* RTA_PRIORITY */
2533 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2534 + nla_total_size(sizeof(struct rta_cacheinfo));
2537 static int rt6_fill_node(struct net *net,
2538 struct sk_buff *skb, struct rt6_info *rt,
2539 struct in6_addr *dst, struct in6_addr *src,
2540 int iif, int type, u32 portid, u32 seq,
2541 int prefix, int nowait, unsigned int flags)
2544 struct nlmsghdr *nlh;
2548 if (prefix) { /* user wants prefix routes only */
2549 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2550 /* success since this is not a prefix route */
2555 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2559 rtm = nlmsg_data(nlh);
2560 rtm->rtm_family = AF_INET6;
2561 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2562 rtm->rtm_src_len = rt->rt6i_src.plen;
2565 table = rt->rt6i_table->tb6_id;
2567 table = RT6_TABLE_UNSPEC;
2568 rtm->rtm_table = table;
2569 if (nla_put_u32(skb, RTA_TABLE, table))
2570 goto nla_put_failure;
2571 if (rt->rt6i_flags & RTF_REJECT) {
2572 switch (rt->dst.error) {
2574 rtm->rtm_type = RTN_BLACKHOLE;
2577 rtm->rtm_type = RTN_PROHIBIT;
2580 rtm->rtm_type = RTN_THROW;
2583 rtm->rtm_type = RTN_UNREACHABLE;
2587 else if (rt->rt6i_flags & RTF_LOCAL)
2588 rtm->rtm_type = RTN_LOCAL;
2589 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2590 rtm->rtm_type = RTN_LOCAL;
2592 rtm->rtm_type = RTN_UNICAST;
2594 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2595 rtm->rtm_protocol = rt->rt6i_protocol;
2596 if (rt->rt6i_flags & RTF_DYNAMIC)
2597 rtm->rtm_protocol = RTPROT_REDIRECT;
2598 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2599 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2600 rtm->rtm_protocol = RTPROT_RA;
2602 rtm->rtm_protocol = RTPROT_KERNEL;
2605 if (rt->rt6i_flags & RTF_CACHE)
2606 rtm->rtm_flags |= RTM_F_CLONED;
2609 if (nla_put(skb, RTA_DST, 16, dst))
2610 goto nla_put_failure;
2611 rtm->rtm_dst_len = 128;
2612 } else if (rtm->rtm_dst_len)
2613 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2614 goto nla_put_failure;
2615 #ifdef CONFIG_IPV6_SUBTREES
2617 if (nla_put(skb, RTA_SRC, 16, src))
2618 goto nla_put_failure;
2619 rtm->rtm_src_len = 128;
2620 } else if (rtm->rtm_src_len &&
2621 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2622 goto nla_put_failure;
2625 #ifdef CONFIG_IPV6_MROUTE
2626 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2627 int err = ip6mr_get_route(net, skb, rtm, nowait);
2632 goto nla_put_failure;
2634 if (err == -EMSGSIZE)
2635 goto nla_put_failure;
2640 if (nla_put_u32(skb, RTA_IIF, iif))
2641 goto nla_put_failure;
2643 struct in6_addr saddr_buf;
2644 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2645 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2646 goto nla_put_failure;
2649 if (rt->rt6i_prefsrc.plen) {
2650 struct in6_addr saddr_buf;
2651 saddr_buf = rt->rt6i_prefsrc.addr;
2652 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2653 goto nla_put_failure;
2656 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2657 goto nla_put_failure;
2659 if (rt->rt6i_flags & RTF_GATEWAY) {
2660 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2661 goto nla_put_failure;
2665 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2666 goto nla_put_failure;
2667 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2668 goto nla_put_failure;
2670 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2672 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2673 goto nla_put_failure;
2675 return nlmsg_end(skb, nlh);
2678 nlmsg_cancel(skb, nlh);
2682 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2684 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2687 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2688 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2689 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2693 return rt6_fill_node(arg->net,
2694 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2695 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2696 prefix, 0, NLM_F_MULTI);
2699 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
2701 struct net *net = sock_net(in_skb->sk);
2702 struct nlattr *tb[RTA_MAX+1];
2703 struct rt6_info *rt;
2704 struct sk_buff *skb;
2707 int err, iif = 0, oif = 0;
2709 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2714 memset(&fl6, 0, sizeof(fl6));
2717 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2720 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2724 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2727 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2731 iif = nla_get_u32(tb[RTA_IIF]);
2734 oif = nla_get_u32(tb[RTA_OIF]);
2737 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
2740 struct net_device *dev;
2743 dev = __dev_get_by_index(net, iif);
2749 fl6.flowi6_iif = iif;
2751 if (!ipv6_addr_any(&fl6.saddr))
2752 flags |= RT6_LOOKUP_F_HAS_SADDR;
2754 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2757 fl6.flowi6_oif = oif;
2759 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2762 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2769 /* Reserve room for dummy headers, this skb can pass
2770 through good chunk of routing engine.
2772 skb_reset_mac_header(skb);
2773 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2775 skb_dst_set(skb, &rt->dst);
2777 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2778 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2779 nlh->nlmsg_seq, 0, 0, 0);
2785 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2790 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2792 struct sk_buff *skb;
2793 struct net *net = info->nl_net;
2798 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2800 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2804 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2805 event, info->portid, seq, 0, 0, 0);
2807 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2808 WARN_ON(err == -EMSGSIZE);
2812 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2813 info->nlh, gfp_any());
2817 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2820 static int ip6_route_dev_notify(struct notifier_block *this,
2821 unsigned long event, void *ptr)
2823 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2824 struct net *net = dev_net(dev);
2826 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2827 net->ipv6.ip6_null_entry->dst.dev = dev;
2828 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2829 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2830 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2831 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2832 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2833 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2844 #ifdef CONFIG_PROC_FS
2846 static const struct file_operations ipv6_route_proc_fops = {
2847 .owner = THIS_MODULE,
2848 .open = ipv6_route_open,
2850 .llseek = seq_lseek,
2851 .release = seq_release_net,
2854 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2856 struct net *net = (struct net *)seq->private;
2857 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2858 net->ipv6.rt6_stats->fib_nodes,
2859 net->ipv6.rt6_stats->fib_route_nodes,
2860 net->ipv6.rt6_stats->fib_rt_alloc,
2861 net->ipv6.rt6_stats->fib_rt_entries,
2862 net->ipv6.rt6_stats->fib_rt_cache,
2863 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2864 net->ipv6.rt6_stats->fib_discarded_routes);
2869 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2871 return single_open_net(inode, file, rt6_stats_seq_show);
2874 static const struct file_operations rt6_stats_seq_fops = {
2875 .owner = THIS_MODULE,
2876 .open = rt6_stats_seq_open,
2878 .llseek = seq_lseek,
2879 .release = single_release_net,
2881 #endif /* CONFIG_PROC_FS */
2883 #ifdef CONFIG_SYSCTL
2886 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2887 void __user *buffer, size_t *lenp, loff_t *ppos)
2894 net = (struct net *)ctl->extra1;
2895 delay = net->ipv6.sysctl.flush_delay;
2896 proc_dointvec(ctl, write, buffer, lenp, ppos);
2897 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2901 struct ctl_table ipv6_route_table_template[] = {
2903 .procname = "flush",
2904 .data = &init_net.ipv6.sysctl.flush_delay,
2905 .maxlen = sizeof(int),
2907 .proc_handler = ipv6_sysctl_rtcache_flush
2910 .procname = "gc_thresh",
2911 .data = &ip6_dst_ops_template.gc_thresh,
2912 .maxlen = sizeof(int),
2914 .proc_handler = proc_dointvec,
2917 .procname = "max_size",
2918 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2919 .maxlen = sizeof(int),
2921 .proc_handler = proc_dointvec,
2924 .procname = "gc_min_interval",
2925 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2926 .maxlen = sizeof(int),
2928 .proc_handler = proc_dointvec_jiffies,
2931 .procname = "gc_timeout",
2932 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2933 .maxlen = sizeof(int),
2935 .proc_handler = proc_dointvec_jiffies,
2938 .procname = "gc_interval",
2939 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2940 .maxlen = sizeof(int),
2942 .proc_handler = proc_dointvec_jiffies,
2945 .procname = "gc_elasticity",
2946 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2947 .maxlen = sizeof(int),
2949 .proc_handler = proc_dointvec,
2952 .procname = "mtu_expires",
2953 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2954 .maxlen = sizeof(int),
2956 .proc_handler = proc_dointvec_jiffies,
2959 .procname = "min_adv_mss",
2960 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2961 .maxlen = sizeof(int),
2963 .proc_handler = proc_dointvec,
2966 .procname = "gc_min_interval_ms",
2967 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2968 .maxlen = sizeof(int),
2970 .proc_handler = proc_dointvec_ms_jiffies,
2975 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2977 struct ctl_table *table;
2979 table = kmemdup(ipv6_route_table_template,
2980 sizeof(ipv6_route_table_template),
2984 table[0].data = &net->ipv6.sysctl.flush_delay;
2985 table[0].extra1 = net;
2986 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2987 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2988 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2989 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2990 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2991 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2992 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2993 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2994 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2996 /* Don't export sysctls to unprivileged users */
2997 if (net->user_ns != &init_user_ns)
2998 table[0].procname = NULL;
3005 static int __net_init ip6_route_net_init(struct net *net)
3009 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
3010 sizeof(net->ipv6.ip6_dst_ops));
3012 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3013 goto out_ip6_dst_ops;
3015 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3016 sizeof(*net->ipv6.ip6_null_entry),
3018 if (!net->ipv6.ip6_null_entry)
3019 goto out_ip6_dst_entries;
3020 net->ipv6.ip6_null_entry->dst.path =
3021 (struct dst_entry *)net->ipv6.ip6_null_entry;
3022 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3023 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3024 ip6_template_metrics, true);
3026 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3027 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3028 sizeof(*net->ipv6.ip6_prohibit_entry),
3030 if (!net->ipv6.ip6_prohibit_entry)
3031 goto out_ip6_null_entry;
3032 net->ipv6.ip6_prohibit_entry->dst.path =
3033 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3034 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3035 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3036 ip6_template_metrics, true);
3038 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3039 sizeof(*net->ipv6.ip6_blk_hole_entry),
3041 if (!net->ipv6.ip6_blk_hole_entry)
3042 goto out_ip6_prohibit_entry;
3043 net->ipv6.ip6_blk_hole_entry->dst.path =
3044 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3045 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3046 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3047 ip6_template_metrics, true);
3050 net->ipv6.sysctl.flush_delay = 0;
3051 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3052 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3053 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3054 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3055 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3056 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3057 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3059 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3065 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3066 out_ip6_prohibit_entry:
3067 kfree(net->ipv6.ip6_prohibit_entry);
3069 kfree(net->ipv6.ip6_null_entry);
3071 out_ip6_dst_entries:
3072 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3077 static void __net_exit ip6_route_net_exit(struct net *net)
3079 kfree(net->ipv6.ip6_null_entry);
3080 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3081 kfree(net->ipv6.ip6_prohibit_entry);
3082 kfree(net->ipv6.ip6_blk_hole_entry);
3084 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3087 static int __net_init ip6_route_net_init_late(struct net *net)
3089 #ifdef CONFIG_PROC_FS
3090 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3091 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3096 static void __net_exit ip6_route_net_exit_late(struct net *net)
3098 #ifdef CONFIG_PROC_FS
3099 remove_proc_entry("ipv6_route", net->proc_net);
3100 remove_proc_entry("rt6_stats", net->proc_net);
3104 static struct pernet_operations ip6_route_net_ops = {
3105 .init = ip6_route_net_init,
3106 .exit = ip6_route_net_exit,
3109 static int __net_init ipv6_inetpeer_init(struct net *net)
3111 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3115 inet_peer_base_init(bp);
3116 net->ipv6.peers = bp;
3120 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3122 struct inet_peer_base *bp = net->ipv6.peers;
3124 net->ipv6.peers = NULL;
3125 inetpeer_invalidate_tree(bp);
3129 static struct pernet_operations ipv6_inetpeer_ops = {
3130 .init = ipv6_inetpeer_init,
3131 .exit = ipv6_inetpeer_exit,
3134 static struct pernet_operations ip6_route_net_late_ops = {
3135 .init = ip6_route_net_init_late,
3136 .exit = ip6_route_net_exit_late,
3139 static struct notifier_block ip6_route_dev_notifier = {
3140 .notifier_call = ip6_route_dev_notify,
3144 int __init ip6_route_init(void)
3149 ip6_dst_ops_template.kmem_cachep =
3150 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3151 SLAB_HWCACHE_ALIGN, NULL);
3152 if (!ip6_dst_ops_template.kmem_cachep)
3155 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3157 goto out_kmem_cache;
3159 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3161 goto out_dst_entries;
3163 ret = register_pernet_subsys(&ip6_route_net_ops);
3165 goto out_register_inetpeer;
3167 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3169 /* Registering of the loopback is done before this portion of code,
3170 * the loopback reference in rt6_info will not be taken, do it
3171 * manually for init_net */
3172 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3173 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3174 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3175 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3176 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3177 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3178 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3182 goto out_register_subsys;
3188 ret = fib6_rules_init();
3192 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3194 goto fib6_rules_init;
3197 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3198 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3199 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3200 goto out_register_late_subsys;
3202 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3204 goto out_register_late_subsys;
3209 out_register_late_subsys:
3210 unregister_pernet_subsys(&ip6_route_net_late_ops);
3212 fib6_rules_cleanup();
3217 out_register_subsys:
3218 unregister_pernet_subsys(&ip6_route_net_ops);
3219 out_register_inetpeer:
3220 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3222 dst_entries_destroy(&ip6_dst_blackhole_ops);
3224 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3228 void ip6_route_cleanup(void)
3230 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3231 unregister_pernet_subsys(&ip6_route_net_late_ops);
3232 fib6_rules_cleanup();
3235 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3236 unregister_pernet_subsys(&ip6_route_net_ops);
3237 dst_entries_destroy(&ip6_dst_blackhole_ops);
3238 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);