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 = -2,
70 RT6_NUD_FAIL_SOFT = -1,
74 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
75 const struct in6_addr *dest);
76 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
77 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
78 static unsigned int ip6_mtu(const struct dst_entry *dst);
79 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
80 static void ip6_dst_destroy(struct dst_entry *);
81 static void ip6_dst_ifdown(struct dst_entry *,
82 struct net_device *dev, int how);
83 static int ip6_dst_gc(struct dst_ops *ops);
85 static int ip6_pkt_discard(struct sk_buff *skb);
86 static int ip6_pkt_discard_out(struct sk_buff *skb);
87 static int ip6_pkt_prohibit(struct sk_buff *skb);
88 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
89 static void ip6_link_failure(struct sk_buff *skb);
90 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
91 struct sk_buff *skb, u32 mtu);
92 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
94 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
96 #ifdef CONFIG_IPV6_ROUTE_INFO
97 static struct rt6_info *rt6_add_route_info(struct net *net,
98 const struct in6_addr *prefix, int prefixlen,
99 const struct in6_addr *gwaddr, int ifindex,
101 static struct rt6_info *rt6_get_route_info(struct net *net,
102 const struct in6_addr *prefix, int prefixlen,
103 const struct in6_addr *gwaddr, int ifindex);
106 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
108 struct rt6_info *rt = (struct rt6_info *) dst;
109 struct inet_peer *peer;
112 if (!(rt->dst.flags & DST_HOST))
115 peer = rt6_get_peer_create(rt);
117 u32 *old_p = __DST_METRICS_PTR(old);
118 unsigned long prev, new;
121 if (inet_metrics_new(peer))
122 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
124 new = (unsigned long) p;
125 prev = cmpxchg(&dst->_metrics, old, new);
128 p = __DST_METRICS_PTR(prev);
129 if (prev & DST_METRICS_READ_ONLY)
136 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
140 struct in6_addr *p = &rt->rt6i_gateway;
142 if (!ipv6_addr_any(p))
143 return (const void *) p;
145 return &ipv6_hdr(skb)->daddr;
149 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
153 struct rt6_info *rt = (struct rt6_info *) dst;
156 daddr = choose_neigh_daddr(rt, skb, daddr);
157 n = __ipv6_neigh_lookup(dst->dev, daddr);
160 return neigh_create(&nd_tbl, daddr, dst->dev);
163 static struct dst_ops ip6_dst_ops_template = {
165 .protocol = cpu_to_be16(ETH_P_IPV6),
168 .check = ip6_dst_check,
169 .default_advmss = ip6_default_advmss,
171 .cow_metrics = ipv6_cow_metrics,
172 .destroy = ip6_dst_destroy,
173 .ifdown = ip6_dst_ifdown,
174 .negative_advice = ip6_negative_advice,
175 .link_failure = ip6_link_failure,
176 .update_pmtu = ip6_rt_update_pmtu,
177 .redirect = rt6_do_redirect,
178 .local_out = __ip6_local_out,
179 .neigh_lookup = ip6_neigh_lookup,
182 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
184 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
186 return mtu ? : dst->dev->mtu;
189 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
190 struct sk_buff *skb, u32 mtu)
194 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
199 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
205 static struct dst_ops ip6_dst_blackhole_ops = {
207 .protocol = cpu_to_be16(ETH_P_IPV6),
208 .destroy = ip6_dst_destroy,
209 .check = ip6_dst_check,
210 .mtu = ip6_blackhole_mtu,
211 .default_advmss = ip6_default_advmss,
212 .update_pmtu = ip6_rt_blackhole_update_pmtu,
213 .redirect = ip6_rt_blackhole_redirect,
214 .cow_metrics = ip6_rt_blackhole_cow_metrics,
215 .neigh_lookup = ip6_neigh_lookup,
218 static const u32 ip6_template_metrics[RTAX_MAX] = {
219 [RTAX_HOPLIMIT - 1] = 0,
222 static const struct rt6_info ip6_null_entry_template = {
224 .__refcnt = ATOMIC_INIT(1),
226 .obsolete = DST_OBSOLETE_FORCE_CHK,
227 .error = -ENETUNREACH,
228 .input = ip6_pkt_discard,
229 .output = ip6_pkt_discard_out,
231 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
232 .rt6i_protocol = RTPROT_KERNEL,
233 .rt6i_metric = ~(u32) 0,
234 .rt6i_ref = ATOMIC_INIT(1),
237 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
239 static const struct rt6_info ip6_prohibit_entry_template = {
241 .__refcnt = ATOMIC_INIT(1),
243 .obsolete = DST_OBSOLETE_FORCE_CHK,
245 .input = ip6_pkt_prohibit,
246 .output = ip6_pkt_prohibit_out,
248 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
249 .rt6i_protocol = RTPROT_KERNEL,
250 .rt6i_metric = ~(u32) 0,
251 .rt6i_ref = ATOMIC_INIT(1),
254 static const struct rt6_info ip6_blk_hole_entry_template = {
256 .__refcnt = ATOMIC_INIT(1),
258 .obsolete = DST_OBSOLETE_FORCE_CHK,
260 .input = dst_discard,
261 .output = dst_discard,
263 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
264 .rt6i_protocol = RTPROT_KERNEL,
265 .rt6i_metric = ~(u32) 0,
266 .rt6i_ref = ATOMIC_INIT(1),
271 /* allocate dst with ip6_dst_ops */
272 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
273 struct net_device *dev,
275 struct fib6_table *table)
277 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
278 0, DST_OBSOLETE_FORCE_CHK, flags);
281 struct dst_entry *dst = &rt->dst;
283 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
284 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
285 rt->rt6i_genid = rt_genid_ipv6(net);
286 INIT_LIST_HEAD(&rt->rt6i_siblings);
291 static void ip6_dst_destroy(struct dst_entry *dst)
293 struct rt6_info *rt = (struct rt6_info *)dst;
294 struct inet6_dev *idev = rt->rt6i_idev;
295 struct dst_entry *from = dst->from;
297 if (!(rt->dst.flags & DST_HOST))
298 dst_destroy_metrics_generic(dst);
301 rt->rt6i_idev = NULL;
308 if (rt6_has_peer(rt)) {
309 struct inet_peer *peer = rt6_peer_ptr(rt);
314 void rt6_bind_peer(struct rt6_info *rt, int create)
316 struct inet_peer_base *base;
317 struct inet_peer *peer;
319 base = inetpeer_base_ptr(rt->_rt6i_peer);
323 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
325 if (!rt6_set_peer(rt, peer))
330 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
333 struct rt6_info *rt = (struct rt6_info *)dst;
334 struct inet6_dev *idev = rt->rt6i_idev;
335 struct net_device *loopback_dev =
336 dev_net(dev)->loopback_dev;
338 if (dev != loopback_dev) {
339 if (idev && idev->dev == dev) {
340 struct inet6_dev *loopback_idev =
341 in6_dev_get(loopback_dev);
343 rt->rt6i_idev = loopback_idev;
350 static bool rt6_check_expired(const struct rt6_info *rt)
352 if (rt->rt6i_flags & RTF_EXPIRES) {
353 if (time_after(jiffies, rt->dst.expires))
355 } else if (rt->dst.from) {
356 return rt6_check_expired((struct rt6_info *) rt->dst.from);
361 static bool rt6_need_strict(const struct in6_addr *daddr)
363 return ipv6_addr_type(daddr) &
364 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
367 /* Multipath route selection:
368 * Hash based function using packet header and flowlabel.
369 * Adapted from fib_info_hashfn()
371 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
372 const struct flowi6 *fl6)
374 unsigned int val = fl6->flowi6_proto;
376 val ^= ipv6_addr_hash(&fl6->daddr);
377 val ^= ipv6_addr_hash(&fl6->saddr);
379 /* Work only if this not encapsulated */
380 switch (fl6->flowi6_proto) {
384 val ^= (__force u16)fl6->fl6_sport;
385 val ^= (__force u16)fl6->fl6_dport;
389 val ^= (__force u16)fl6->fl6_icmp_type;
390 val ^= (__force u16)fl6->fl6_icmp_code;
393 /* RFC6438 recommands to use flowlabel */
394 val ^= (__force u32)fl6->flowlabel;
396 /* Perhaps, we need to tune, this function? */
397 val = val ^ (val >> 7) ^ (val >> 12);
398 return val % candidate_count;
401 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
402 struct flowi6 *fl6, int oif,
405 struct rt6_info *sibling, *next_sibling;
408 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
409 /* Don't change the route, if route_choosen == 0
410 * (siblings does not include ourself)
413 list_for_each_entry_safe(sibling, next_sibling,
414 &match->rt6i_siblings, rt6i_siblings) {
416 if (route_choosen == 0) {
417 if (rt6_score_route(sibling, oif, strict) < 0)
427 * Route lookup. Any table->tb6_lock is implied.
430 static inline struct rt6_info *rt6_device_match(struct net *net,
432 const struct in6_addr *saddr,
436 struct rt6_info *local = NULL;
437 struct rt6_info *sprt;
439 if (!oif && ipv6_addr_any(saddr))
442 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
443 struct net_device *dev = sprt->dst.dev;
446 if (dev->ifindex == oif)
448 if (dev->flags & IFF_LOOPBACK) {
449 if (!sprt->rt6i_idev ||
450 sprt->rt6i_idev->dev->ifindex != oif) {
451 if (flags & RT6_LOOKUP_F_IFACE && oif)
453 if (local && (!oif ||
454 local->rt6i_idev->dev->ifindex == oif))
460 if (ipv6_chk_addr(net, saddr, dev,
461 flags & RT6_LOOKUP_F_IFACE))
470 if (flags & RT6_LOOKUP_F_IFACE)
471 return net->ipv6.ip6_null_entry;
477 #ifdef CONFIG_IPV6_ROUTER_PREF
478 struct __rt6_probe_work {
479 struct work_struct work;
480 struct in6_addr target;
481 struct net_device *dev;
484 static void rt6_probe_deferred(struct work_struct *w)
486 struct in6_addr mcaddr;
487 struct __rt6_probe_work *work =
488 container_of(w, struct __rt6_probe_work, work);
490 addrconf_addr_solict_mult(&work->target, &mcaddr);
491 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
496 static void rt6_probe(struct rt6_info *rt)
498 struct neighbour *neigh;
500 * Okay, this does not seem to be appropriate
501 * for now, however, we need to check if it
502 * is really so; aka Router Reachability Probing.
504 * Router Reachability Probe MUST be rate-limited
505 * to no more than one per minute.
507 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
510 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
512 write_lock(&neigh->lock);
513 if (neigh->nud_state & NUD_VALID)
518 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
519 struct __rt6_probe_work *work;
521 work = kmalloc(sizeof(*work), GFP_ATOMIC);
524 neigh->updated = jiffies;
527 write_unlock(&neigh->lock);
530 INIT_WORK(&work->work, rt6_probe_deferred);
531 work->target = rt->rt6i_gateway;
532 dev_hold(rt->dst.dev);
533 work->dev = rt->dst.dev;
534 schedule_work(&work->work);
538 write_unlock(&neigh->lock);
540 rcu_read_unlock_bh();
543 static inline void rt6_probe(struct rt6_info *rt)
549 * Default Router Selection (RFC 2461 6.3.6)
551 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
553 struct net_device *dev = rt->dst.dev;
554 if (!oif || dev->ifindex == oif)
556 if ((dev->flags & IFF_LOOPBACK) &&
557 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
562 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
564 struct neighbour *neigh;
565 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
567 if (rt->rt6i_flags & RTF_NONEXTHOP ||
568 !(rt->rt6i_flags & RTF_GATEWAY))
569 return RT6_NUD_SUCCEED;
572 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
574 read_lock(&neigh->lock);
575 if (neigh->nud_state & NUD_VALID)
576 ret = RT6_NUD_SUCCEED;
577 #ifdef CONFIG_IPV6_ROUTER_PREF
578 else if (!(neigh->nud_state & NUD_FAILED))
579 ret = RT6_NUD_SUCCEED;
581 read_unlock(&neigh->lock);
583 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
584 RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
586 rcu_read_unlock_bh();
591 static int rt6_score_route(struct rt6_info *rt, int oif,
596 m = rt6_check_dev(rt, oif);
597 if (!m && (strict & RT6_LOOKUP_F_IFACE))
598 return RT6_NUD_FAIL_HARD;
599 #ifdef CONFIG_IPV6_ROUTER_PREF
600 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
602 if (strict & RT6_LOOKUP_F_REACHABLE) {
603 int n = rt6_check_neigh(rt);
610 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
611 int *mpri, struct rt6_info *match,
615 bool match_do_rr = false;
617 if (rt6_check_expired(rt))
620 m = rt6_score_route(rt, oif, strict);
621 if (m == RT6_NUD_FAIL_SOFT) {
623 m = 0; /* lowest valid score */
628 if (strict & RT6_LOOKUP_F_REACHABLE)
632 *do_rr = match_do_rr;
640 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
641 struct rt6_info *rr_head,
642 u32 metric, int oif, int strict,
645 struct rt6_info *rt, *match;
649 for (rt = rr_head; rt && rt->rt6i_metric == metric;
650 rt = rt->dst.rt6_next)
651 match = find_match(rt, oif, strict, &mpri, match, do_rr);
652 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
653 rt = rt->dst.rt6_next)
654 match = find_match(rt, oif, strict, &mpri, match, do_rr);
659 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
661 struct rt6_info *match, *rt0;
667 fn->rr_ptr = rt0 = fn->leaf;
669 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
673 struct rt6_info *next = rt0->dst.rt6_next;
675 /* no entries matched; do round-robin */
676 if (!next || next->rt6i_metric != rt0->rt6i_metric)
683 net = dev_net(rt0->dst.dev);
684 return match ? match : net->ipv6.ip6_null_entry;
687 #ifdef CONFIG_IPV6_ROUTE_INFO
688 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
689 const struct in6_addr *gwaddr)
691 struct net *net = dev_net(dev);
692 struct route_info *rinfo = (struct route_info *) opt;
693 struct in6_addr prefix_buf, *prefix;
695 unsigned long lifetime;
698 if (len < sizeof(struct route_info)) {
702 /* Sanity check for prefix_len and length */
703 if (rinfo->length > 3) {
705 } else if (rinfo->prefix_len > 128) {
707 } else if (rinfo->prefix_len > 64) {
708 if (rinfo->length < 2) {
711 } else if (rinfo->prefix_len > 0) {
712 if (rinfo->length < 1) {
717 pref = rinfo->route_pref;
718 if (pref == ICMPV6_ROUTER_PREF_INVALID)
721 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
723 if (rinfo->length == 3)
724 prefix = (struct in6_addr *)rinfo->prefix;
726 /* this function is safe */
727 ipv6_addr_prefix(&prefix_buf,
728 (struct in6_addr *)rinfo->prefix,
730 prefix = &prefix_buf;
733 if (rinfo->prefix_len == 0)
734 rt = rt6_get_dflt_router(gwaddr, dev);
736 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
737 gwaddr, dev->ifindex);
739 if (rt && !lifetime) {
745 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
748 rt->rt6i_flags = RTF_ROUTEINFO |
749 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
752 if (!addrconf_finite_timeout(lifetime))
753 rt6_clean_expires(rt);
755 rt6_set_expires(rt, jiffies + HZ * lifetime);
763 #define BACKTRACK(__net, saddr) \
765 if (rt == __net->ipv6.ip6_null_entry) { \
766 struct fib6_node *pn; \
768 if (fn->fn_flags & RTN_TL_ROOT) \
771 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
772 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
775 if (fn->fn_flags & RTN_RTINFO) \
781 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
782 struct fib6_table *table,
783 struct flowi6 *fl6, int flags)
785 struct fib6_node *fn;
788 read_lock_bh(&table->tb6_lock);
789 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
792 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
793 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
794 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
795 BACKTRACK(net, &fl6->saddr);
797 dst_use(&rt->dst, jiffies);
798 read_unlock_bh(&table->tb6_lock);
803 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
806 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
808 EXPORT_SYMBOL_GPL(ip6_route_lookup);
810 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
811 const struct in6_addr *saddr, int oif, int strict)
813 struct flowi6 fl6 = {
817 struct dst_entry *dst;
818 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
821 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
822 flags |= RT6_LOOKUP_F_HAS_SADDR;
825 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
827 return (struct rt6_info *) dst;
834 EXPORT_SYMBOL(rt6_lookup);
836 /* ip6_ins_rt is called with FREE table->tb6_lock.
837 It takes new route entry, the addition fails by any reason the
838 route is freed. In any case, if caller does not hold it, it may
842 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
845 struct fib6_table *table;
847 table = rt->rt6i_table;
848 write_lock_bh(&table->tb6_lock);
849 err = fib6_add(&table->tb6_root, rt, info);
850 write_unlock_bh(&table->tb6_lock);
855 int ip6_ins_rt(struct rt6_info *rt)
857 struct nl_info info = {
858 .nl_net = dev_net(rt->dst.dev),
860 return __ip6_ins_rt(rt, &info);
863 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
864 const struct in6_addr *daddr,
865 const struct in6_addr *saddr)
873 rt = ip6_rt_copy(ort, daddr);
876 if (ort->rt6i_dst.plen != 128 &&
877 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
878 rt->rt6i_flags |= RTF_ANYCAST;
880 rt->rt6i_flags |= RTF_CACHE;
882 #ifdef CONFIG_IPV6_SUBTREES
883 if (rt->rt6i_src.plen && saddr) {
884 rt->rt6i_src.addr = *saddr;
885 rt->rt6i_src.plen = 128;
893 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
894 const struct in6_addr *daddr)
896 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
899 rt->rt6i_flags |= RTF_CACHE;
903 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
904 struct flowi6 *fl6, int flags)
906 struct fib6_node *fn;
907 struct rt6_info *rt, *nrt;
911 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
913 strict |= flags & RT6_LOOKUP_F_IFACE;
916 read_lock_bh(&table->tb6_lock);
919 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
922 rt = rt6_select(fn, oif, strict | reachable);
923 if (rt->rt6i_nsiblings)
924 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
925 BACKTRACK(net, &fl6->saddr);
926 if (rt == net->ipv6.ip6_null_entry ||
927 rt->rt6i_flags & RTF_CACHE)
931 read_unlock_bh(&table->tb6_lock);
933 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
934 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
935 else if (!(rt->dst.flags & DST_HOST))
936 nrt = rt6_alloc_clone(rt, &fl6->daddr);
941 rt = nrt ? : net->ipv6.ip6_null_entry;
945 err = ip6_ins_rt(nrt);
954 * Race condition! In the gap, when table->tb6_lock was
955 * released someone could insert this route. Relookup.
966 read_unlock_bh(&table->tb6_lock);
968 rt->dst.lastuse = jiffies;
974 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
975 struct flowi6 *fl6, int flags)
977 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
980 static struct dst_entry *ip6_route_input_lookup(struct net *net,
981 struct net_device *dev,
982 struct flowi6 *fl6, int flags)
984 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
985 flags |= RT6_LOOKUP_F_IFACE;
987 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
990 void ip6_route_input(struct sk_buff *skb)
992 const struct ipv6hdr *iph = ipv6_hdr(skb);
993 struct net *net = dev_net(skb->dev);
994 int flags = RT6_LOOKUP_F_HAS_SADDR;
995 struct flowi6 fl6 = {
996 .flowi6_iif = skb->dev->ifindex,
999 .flowlabel = ip6_flowinfo(iph),
1000 .flowi6_mark = skb->mark,
1001 .flowi6_proto = iph->nexthdr,
1004 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1007 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1008 struct flowi6 *fl6, int flags)
1010 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1013 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1018 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1020 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1021 flags |= RT6_LOOKUP_F_IFACE;
1023 if (!ipv6_addr_any(&fl6->saddr))
1024 flags |= RT6_LOOKUP_F_HAS_SADDR;
1026 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1028 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1031 EXPORT_SYMBOL(ip6_route_output);
1033 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1035 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1036 struct dst_entry *new = NULL;
1038 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1042 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1043 rt6_init_peer(rt, net->ipv6.peers);
1046 new->input = dst_discard;
1047 new->output = dst_discard;
1049 if (dst_metrics_read_only(&ort->dst))
1050 new->_metrics = ort->dst._metrics;
1052 dst_copy_metrics(new, &ort->dst);
1053 rt->rt6i_idev = ort->rt6i_idev;
1055 in6_dev_hold(rt->rt6i_idev);
1057 rt->rt6i_gateway = ort->rt6i_gateway;
1058 rt->rt6i_flags = ort->rt6i_flags;
1059 rt->rt6i_metric = 0;
1061 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1062 #ifdef CONFIG_IPV6_SUBTREES
1063 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1069 dst_release(dst_orig);
1070 return new ? new : ERR_PTR(-ENOMEM);
1074 * Destination cache support functions
1077 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1079 struct rt6_info *rt;
1081 rt = (struct rt6_info *) dst;
1083 /* All IPV6 dsts are created with ->obsolete set to the value
1084 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1085 * into this function always.
1087 if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
1090 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1093 if (rt6_check_expired(rt))
1099 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1101 struct rt6_info *rt = (struct rt6_info *) dst;
1104 if (rt->rt6i_flags & RTF_CACHE) {
1105 if (rt6_check_expired(rt)) {
1117 static void ip6_link_failure(struct sk_buff *skb)
1119 struct rt6_info *rt;
1121 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1123 rt = (struct rt6_info *) skb_dst(skb);
1125 if (rt->rt6i_flags & RTF_CACHE) {
1129 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1130 rt->rt6i_node->fn_sernum = -1;
1135 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1136 struct sk_buff *skb, u32 mtu)
1138 struct rt6_info *rt6 = (struct rt6_info*)dst;
1141 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1142 struct net *net = dev_net(dst->dev);
1144 rt6->rt6i_flags |= RTF_MODIFIED;
1145 if (mtu < IPV6_MIN_MTU) {
1146 u32 features = dst_metric(dst, RTAX_FEATURES);
1148 features |= RTAX_FEATURE_ALLFRAG;
1149 dst_metric_set(dst, RTAX_FEATURES, features);
1151 dst_metric_set(dst, RTAX_MTU, mtu);
1152 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1156 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1159 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1160 struct dst_entry *dst;
1163 memset(&fl6, 0, sizeof(fl6));
1164 fl6.flowi6_oif = oif;
1165 fl6.flowi6_mark = mark;
1166 fl6.daddr = iph->daddr;
1167 fl6.saddr = iph->saddr;
1168 fl6.flowlabel = ip6_flowinfo(iph);
1170 dst = ip6_route_output(net, NULL, &fl6);
1172 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1175 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1177 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1179 ip6_update_pmtu(skb, sock_net(sk), mtu,
1180 sk->sk_bound_dev_if, sk->sk_mark);
1182 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1184 /* Handle redirects */
1185 struct ip6rd_flowi {
1187 struct in6_addr gateway;
1190 static struct rt6_info *__ip6_route_redirect(struct net *net,
1191 struct fib6_table *table,
1195 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1196 struct rt6_info *rt;
1197 struct fib6_node *fn;
1199 /* Get the "current" route for this destination and
1200 * check if the redirect has come from approriate router.
1202 * RFC 4861 specifies that redirects should only be
1203 * accepted if they come from the nexthop to the target.
1204 * Due to the way the routes are chosen, this notion
1205 * is a bit fuzzy and one might need to check all possible
1209 read_lock_bh(&table->tb6_lock);
1210 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1212 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1213 if (rt6_check_expired(rt))
1217 if (!(rt->rt6i_flags & RTF_GATEWAY))
1219 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1221 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1227 rt = net->ipv6.ip6_null_entry;
1228 else if (rt->dst.error) {
1229 rt = net->ipv6.ip6_null_entry;
1232 BACKTRACK(net, &fl6->saddr);
1236 read_unlock_bh(&table->tb6_lock);
1241 static struct dst_entry *ip6_route_redirect(struct net *net,
1242 const struct flowi6 *fl6,
1243 const struct in6_addr *gateway)
1245 int flags = RT6_LOOKUP_F_HAS_SADDR;
1246 struct ip6rd_flowi rdfl;
1249 rdfl.gateway = *gateway;
1251 return fib6_rule_lookup(net, &rdfl.fl6,
1252 flags, __ip6_route_redirect);
1255 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1257 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1258 struct dst_entry *dst;
1261 memset(&fl6, 0, sizeof(fl6));
1262 fl6.flowi6_oif = oif;
1263 fl6.flowi6_mark = mark;
1264 fl6.daddr = iph->daddr;
1265 fl6.saddr = iph->saddr;
1266 fl6.flowlabel = ip6_flowinfo(iph);
1268 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1269 rt6_do_redirect(dst, NULL, skb);
1272 EXPORT_SYMBOL_GPL(ip6_redirect);
1274 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1277 const struct ipv6hdr *iph = ipv6_hdr(skb);
1278 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1279 struct dst_entry *dst;
1282 memset(&fl6, 0, sizeof(fl6));
1283 fl6.flowi6_oif = oif;
1284 fl6.flowi6_mark = mark;
1285 fl6.daddr = msg->dest;
1286 fl6.saddr = iph->daddr;
1288 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1289 rt6_do_redirect(dst, NULL, skb);
1293 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1295 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1297 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1299 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1301 struct net_device *dev = dst->dev;
1302 unsigned int mtu = dst_mtu(dst);
1303 struct net *net = dev_net(dev);
1305 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1307 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1308 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1311 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1312 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1313 * IPV6_MAXPLEN is also valid and means: "any MSS,
1314 * rely only on pmtu discovery"
1316 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1321 static unsigned int ip6_mtu(const struct dst_entry *dst)
1323 struct inet6_dev *idev;
1324 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1332 idev = __in6_dev_get(dst->dev);
1334 mtu = idev->cnf.mtu6;
1340 static struct dst_entry *icmp6_dst_gc_list;
1341 static DEFINE_SPINLOCK(icmp6_dst_lock);
1343 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1346 struct dst_entry *dst;
1347 struct rt6_info *rt;
1348 struct inet6_dev *idev = in6_dev_get(dev);
1349 struct net *net = dev_net(dev);
1351 if (unlikely(!idev))
1352 return ERR_PTR(-ENODEV);
1354 rt = ip6_dst_alloc(net, dev, 0, NULL);
1355 if (unlikely(!rt)) {
1357 dst = ERR_PTR(-ENOMEM);
1361 rt->dst.flags |= DST_HOST;
1362 rt->dst.output = ip6_output;
1363 atomic_set(&rt->dst.__refcnt, 1);
1364 rt->rt6i_gateway = fl6->daddr;
1365 rt->rt6i_dst.addr = fl6->daddr;
1366 rt->rt6i_dst.plen = 128;
1367 rt->rt6i_idev = idev;
1368 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1370 spin_lock_bh(&icmp6_dst_lock);
1371 rt->dst.next = icmp6_dst_gc_list;
1372 icmp6_dst_gc_list = &rt->dst;
1373 spin_unlock_bh(&icmp6_dst_lock);
1375 fib6_force_start_gc(net);
1377 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1383 int icmp6_dst_gc(void)
1385 struct dst_entry *dst, **pprev;
1388 spin_lock_bh(&icmp6_dst_lock);
1389 pprev = &icmp6_dst_gc_list;
1391 while ((dst = *pprev) != NULL) {
1392 if (!atomic_read(&dst->__refcnt)) {
1401 spin_unlock_bh(&icmp6_dst_lock);
1406 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1409 struct dst_entry *dst, **pprev;
1411 spin_lock_bh(&icmp6_dst_lock);
1412 pprev = &icmp6_dst_gc_list;
1413 while ((dst = *pprev) != NULL) {
1414 struct rt6_info *rt = (struct rt6_info *) dst;
1415 if (func(rt, arg)) {
1422 spin_unlock_bh(&icmp6_dst_lock);
1425 static int ip6_dst_gc(struct dst_ops *ops)
1427 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1428 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1429 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1430 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1431 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1432 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1435 entries = dst_entries_get_fast(ops);
1436 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1437 entries <= rt_max_size)
1440 net->ipv6.ip6_rt_gc_expire++;
1441 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1442 entries = dst_entries_get_slow(ops);
1443 if (entries < ops->gc_thresh)
1444 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1446 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1447 return entries > rt_max_size;
1454 int ip6_route_add(struct fib6_config *cfg)
1457 struct net *net = cfg->fc_nlinfo.nl_net;
1458 struct rt6_info *rt = NULL;
1459 struct net_device *dev = NULL;
1460 struct inet6_dev *idev = NULL;
1461 struct fib6_table *table;
1464 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1466 #ifndef CONFIG_IPV6_SUBTREES
1467 if (cfg->fc_src_len)
1470 if (cfg->fc_ifindex) {
1472 dev = dev_get_by_index(net, cfg->fc_ifindex);
1475 idev = in6_dev_get(dev);
1480 if (cfg->fc_metric == 0)
1481 cfg->fc_metric = IP6_RT_PRIO_USER;
1484 if (cfg->fc_nlinfo.nlh &&
1485 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1486 table = fib6_get_table(net, cfg->fc_table);
1488 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1489 table = fib6_new_table(net, cfg->fc_table);
1492 table = fib6_new_table(net, cfg->fc_table);
1498 rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);
1505 if (cfg->fc_flags & RTF_EXPIRES)
1506 rt6_set_expires(rt, jiffies +
1507 clock_t_to_jiffies(cfg->fc_expires));
1509 rt6_clean_expires(rt);
1511 if (cfg->fc_protocol == RTPROT_UNSPEC)
1512 cfg->fc_protocol = RTPROT_BOOT;
1513 rt->rt6i_protocol = cfg->fc_protocol;
1515 addr_type = ipv6_addr_type(&cfg->fc_dst);
1517 if (addr_type & IPV6_ADDR_MULTICAST)
1518 rt->dst.input = ip6_mc_input;
1519 else if (cfg->fc_flags & RTF_LOCAL)
1520 rt->dst.input = ip6_input;
1522 rt->dst.input = ip6_forward;
1524 rt->dst.output = ip6_output;
1526 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1527 rt->rt6i_dst.plen = cfg->fc_dst_len;
1528 if (rt->rt6i_dst.plen == 128)
1529 rt->dst.flags |= DST_HOST;
1531 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1532 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1537 dst_init_metrics(&rt->dst, metrics, 0);
1539 #ifdef CONFIG_IPV6_SUBTREES
1540 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1541 rt->rt6i_src.plen = cfg->fc_src_len;
1544 rt->rt6i_metric = cfg->fc_metric;
1546 /* We cannot add true routes via loopback here,
1547 they would result in kernel looping; promote them to reject routes
1549 if ((cfg->fc_flags & RTF_REJECT) ||
1550 (dev && (dev->flags & IFF_LOOPBACK) &&
1551 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1552 !(cfg->fc_flags & RTF_LOCAL))) {
1553 /* hold loopback dev/idev if we haven't done so. */
1554 if (dev != net->loopback_dev) {
1559 dev = net->loopback_dev;
1561 idev = in6_dev_get(dev);
1567 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1568 switch (cfg->fc_type) {
1570 rt->dst.error = -EINVAL;
1571 rt->dst.output = dst_discard;
1572 rt->dst.input = dst_discard;
1575 rt->dst.error = -EACCES;
1576 rt->dst.output = ip6_pkt_prohibit_out;
1577 rt->dst.input = ip6_pkt_prohibit;
1581 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1583 rt->dst.output = ip6_pkt_discard_out;
1584 rt->dst.input = ip6_pkt_discard;
1590 if (cfg->fc_flags & RTF_GATEWAY) {
1591 const struct in6_addr *gw_addr;
1594 gw_addr = &cfg->fc_gateway;
1595 rt->rt6i_gateway = *gw_addr;
1596 gwa_type = ipv6_addr_type(gw_addr);
1598 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1599 struct rt6_info *grt;
1601 /* IPv6 strictly inhibits using not link-local
1602 addresses as nexthop address.
1603 Otherwise, router will not able to send redirects.
1604 It is very good, but in some (rare!) circumstances
1605 (SIT, PtP, NBMA NOARP links) it is handy to allow
1606 some exceptions. --ANK
1609 if (!(gwa_type & IPV6_ADDR_UNICAST))
1612 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1614 err = -EHOSTUNREACH;
1618 if (dev != grt->dst.dev) {
1624 idev = grt->rt6i_idev;
1626 in6_dev_hold(grt->rt6i_idev);
1628 if (!(grt->rt6i_flags & RTF_GATEWAY))
1636 if (!dev || (dev->flags & IFF_LOOPBACK))
1644 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1645 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1649 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1650 rt->rt6i_prefsrc.plen = 128;
1652 rt->rt6i_prefsrc.plen = 0;
1654 rt->rt6i_flags = cfg->fc_flags;
1661 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1662 int type = nla_type(nla);
1665 if (type > RTAX_MAX) {
1670 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1676 rt->rt6i_idev = idev;
1677 rt->rt6i_table = table;
1679 cfg->fc_nlinfo.nl_net = dev_net(dev);
1681 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1693 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1696 struct fib6_table *table;
1697 struct net *net = dev_net(rt->dst.dev);
1699 if (rt == net->ipv6.ip6_null_entry) {
1704 table = rt->rt6i_table;
1705 write_lock_bh(&table->tb6_lock);
1706 err = fib6_del(rt, info);
1707 write_unlock_bh(&table->tb6_lock);
1714 int ip6_del_rt(struct rt6_info *rt)
1716 struct nl_info info = {
1717 .nl_net = dev_net(rt->dst.dev),
1719 return __ip6_del_rt(rt, &info);
1722 static int ip6_route_del(struct fib6_config *cfg)
1724 struct fib6_table *table;
1725 struct fib6_node *fn;
1726 struct rt6_info *rt;
1729 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1733 read_lock_bh(&table->tb6_lock);
1735 fn = fib6_locate(&table->tb6_root,
1736 &cfg->fc_dst, cfg->fc_dst_len,
1737 &cfg->fc_src, cfg->fc_src_len);
1740 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1741 if (cfg->fc_ifindex &&
1743 rt->dst.dev->ifindex != cfg->fc_ifindex))
1745 if (cfg->fc_flags & RTF_GATEWAY &&
1746 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1748 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1751 read_unlock_bh(&table->tb6_lock);
1753 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1756 read_unlock_bh(&table->tb6_lock);
1761 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1763 struct net *net = dev_net(skb->dev);
1764 struct netevent_redirect netevent;
1765 struct rt6_info *rt, *nrt = NULL;
1766 struct ndisc_options ndopts;
1767 struct inet6_dev *in6_dev;
1768 struct neighbour *neigh;
1770 int optlen, on_link;
1773 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1774 optlen -= sizeof(*msg);
1777 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1781 msg = (struct rd_msg *)icmp6_hdr(skb);
1783 if (ipv6_addr_is_multicast(&msg->dest)) {
1784 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1789 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1791 } else if (ipv6_addr_type(&msg->target) !=
1792 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1793 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1797 in6_dev = __in6_dev_get(skb->dev);
1800 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1804 * The IP source address of the Redirect MUST be the same as the current
1805 * first-hop router for the specified ICMP Destination Address.
1808 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1809 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1814 if (ndopts.nd_opts_tgt_lladdr) {
1815 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1818 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1823 rt = (struct rt6_info *) dst;
1824 if (rt == net->ipv6.ip6_null_entry) {
1825 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1829 /* Redirect received -> path was valid.
1830 * Look, redirects are sent only in response to data packets,
1831 * so that this nexthop apparently is reachable. --ANK
1833 dst_confirm(&rt->dst);
1835 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1840 * We have finally decided to accept it.
1843 neigh_update(neigh, lladdr, NUD_STALE,
1844 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1845 NEIGH_UPDATE_F_OVERRIDE|
1846 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1847 NEIGH_UPDATE_F_ISROUTER))
1850 nrt = ip6_rt_copy(rt, &msg->dest);
1854 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1856 nrt->rt6i_flags &= ~RTF_GATEWAY;
1858 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1860 if (ip6_ins_rt(nrt))
1863 netevent.old = &rt->dst;
1864 netevent.new = &nrt->dst;
1865 netevent.daddr = &msg->dest;
1866 netevent.neigh = neigh;
1867 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1869 if (rt->rt6i_flags & RTF_CACHE) {
1870 rt = (struct rt6_info *) dst_clone(&rt->dst);
1875 neigh_release(neigh);
1879 * Misc support functions
1882 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1883 const struct in6_addr *dest)
1885 struct net *net = dev_net(ort->dst.dev);
1886 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1890 rt->dst.input = ort->dst.input;
1891 rt->dst.output = ort->dst.output;
1892 rt->dst.flags |= DST_HOST;
1894 rt->rt6i_dst.addr = *dest;
1895 rt->rt6i_dst.plen = 128;
1896 dst_copy_metrics(&rt->dst, &ort->dst);
1897 rt->dst.error = ort->dst.error;
1898 rt->rt6i_idev = ort->rt6i_idev;
1900 in6_dev_hold(rt->rt6i_idev);
1901 rt->dst.lastuse = jiffies;
1903 if (ort->rt6i_flags & RTF_GATEWAY)
1904 rt->rt6i_gateway = ort->rt6i_gateway;
1906 rt->rt6i_gateway = *dest;
1907 rt->rt6i_flags = ort->rt6i_flags;
1908 rt6_set_from(rt, ort);
1909 rt->rt6i_metric = 0;
1911 #ifdef CONFIG_IPV6_SUBTREES
1912 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1914 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1915 rt->rt6i_table = ort->rt6i_table;
1920 #ifdef CONFIG_IPV6_ROUTE_INFO
1921 static struct rt6_info *rt6_get_route_info(struct net *net,
1922 const struct in6_addr *prefix, int prefixlen,
1923 const struct in6_addr *gwaddr, int ifindex)
1925 struct fib6_node *fn;
1926 struct rt6_info *rt = NULL;
1927 struct fib6_table *table;
1929 table = fib6_get_table(net, RT6_TABLE_INFO);
1933 read_lock_bh(&table->tb6_lock);
1934 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1938 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1939 if (rt->dst.dev->ifindex != ifindex)
1941 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1943 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1949 read_unlock_bh(&table->tb6_lock);
1953 static struct rt6_info *rt6_add_route_info(struct net *net,
1954 const struct in6_addr *prefix, int prefixlen,
1955 const struct in6_addr *gwaddr, int ifindex,
1958 struct fib6_config cfg = {
1959 .fc_table = RT6_TABLE_INFO,
1960 .fc_metric = IP6_RT_PRIO_USER,
1961 .fc_ifindex = ifindex,
1962 .fc_dst_len = prefixlen,
1963 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1964 RTF_UP | RTF_PREF(pref),
1965 .fc_nlinfo.portid = 0,
1966 .fc_nlinfo.nlh = NULL,
1967 .fc_nlinfo.nl_net = net,
1970 cfg.fc_dst = *prefix;
1971 cfg.fc_gateway = *gwaddr;
1973 /* We should treat it as a default route if prefix length is 0. */
1975 cfg.fc_flags |= RTF_DEFAULT;
1977 ip6_route_add(&cfg);
1979 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1983 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1985 struct rt6_info *rt;
1986 struct fib6_table *table;
1988 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1992 read_lock_bh(&table->tb6_lock);
1993 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1994 if (dev == rt->dst.dev &&
1995 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1996 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2001 read_unlock_bh(&table->tb6_lock);
2005 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2006 struct net_device *dev,
2009 struct fib6_config cfg = {
2010 .fc_table = RT6_TABLE_DFLT,
2011 .fc_metric = IP6_RT_PRIO_USER,
2012 .fc_ifindex = dev->ifindex,
2013 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2014 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2015 .fc_nlinfo.portid = 0,
2016 .fc_nlinfo.nlh = NULL,
2017 .fc_nlinfo.nl_net = dev_net(dev),
2020 cfg.fc_gateway = *gwaddr;
2022 ip6_route_add(&cfg);
2024 return rt6_get_dflt_router(gwaddr, dev);
2027 void rt6_purge_dflt_routers(struct net *net)
2029 struct rt6_info *rt;
2030 struct fib6_table *table;
2032 /* NOTE: Keep consistent with rt6_get_dflt_router */
2033 table = fib6_get_table(net, RT6_TABLE_DFLT);
2038 read_lock_bh(&table->tb6_lock);
2039 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2040 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2041 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2043 read_unlock_bh(&table->tb6_lock);
2048 read_unlock_bh(&table->tb6_lock);
2051 static void rtmsg_to_fib6_config(struct net *net,
2052 struct in6_rtmsg *rtmsg,
2053 struct fib6_config *cfg)
2055 memset(cfg, 0, sizeof(*cfg));
2057 cfg->fc_table = RT6_TABLE_MAIN;
2058 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2059 cfg->fc_metric = rtmsg->rtmsg_metric;
2060 cfg->fc_expires = rtmsg->rtmsg_info;
2061 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2062 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2063 cfg->fc_flags = rtmsg->rtmsg_flags;
2065 cfg->fc_nlinfo.nl_net = net;
2067 cfg->fc_dst = rtmsg->rtmsg_dst;
2068 cfg->fc_src = rtmsg->rtmsg_src;
2069 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2072 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2074 struct fib6_config cfg;
2075 struct in6_rtmsg rtmsg;
2079 case SIOCADDRT: /* Add a route */
2080 case SIOCDELRT: /* Delete a route */
2081 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2083 err = copy_from_user(&rtmsg, arg,
2084 sizeof(struct in6_rtmsg));
2088 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2093 err = ip6_route_add(&cfg);
2096 err = ip6_route_del(&cfg);
2110 * Drop the packet on the floor
2113 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2116 struct dst_entry *dst = skb_dst(skb);
2117 switch (ipstats_mib_noroutes) {
2118 case IPSTATS_MIB_INNOROUTES:
2119 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2120 if (type == IPV6_ADDR_ANY) {
2121 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2122 IPSTATS_MIB_INADDRERRORS);
2126 case IPSTATS_MIB_OUTNOROUTES:
2127 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2128 ipstats_mib_noroutes);
2131 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2136 static int ip6_pkt_discard(struct sk_buff *skb)
2138 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2141 static int ip6_pkt_discard_out(struct sk_buff *skb)
2143 skb->dev = skb_dst(skb)->dev;
2144 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2147 static int ip6_pkt_prohibit(struct sk_buff *skb)
2149 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2152 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2154 skb->dev = skb_dst(skb)->dev;
2155 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2159 * Allocate a dst for local (unicast / anycast) address.
2162 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2163 const struct in6_addr *addr,
2166 struct net *net = dev_net(idev->dev);
2167 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2170 return ERR_PTR(-ENOMEM);
2174 rt->dst.flags |= DST_HOST;
2175 rt->dst.input = ip6_input;
2176 rt->dst.output = ip6_output;
2177 rt->rt6i_idev = idev;
2179 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2181 rt->rt6i_flags |= RTF_ANYCAST;
2183 rt->rt6i_flags |= RTF_LOCAL;
2185 rt->rt6i_gateway = *addr;
2186 rt->rt6i_dst.addr = *addr;
2187 rt->rt6i_dst.plen = 128;
2188 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2190 atomic_set(&rt->dst.__refcnt, 1);
2195 int ip6_route_get_saddr(struct net *net,
2196 struct rt6_info *rt,
2197 const struct in6_addr *daddr,
2199 struct in6_addr *saddr)
2201 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2203 if (rt->rt6i_prefsrc.plen)
2204 *saddr = rt->rt6i_prefsrc.addr;
2206 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2207 daddr, prefs, saddr);
2211 /* remove deleted ip from prefsrc entries */
2212 struct arg_dev_net_ip {
2213 struct net_device *dev;
2215 struct in6_addr *addr;
2218 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2220 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2221 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2222 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2224 if (((void *)rt->dst.dev == dev || !dev) &&
2225 rt != net->ipv6.ip6_null_entry &&
2226 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2227 /* remove prefsrc entry */
2228 rt->rt6i_prefsrc.plen = 0;
2233 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2235 struct net *net = dev_net(ifp->idev->dev);
2236 struct arg_dev_net_ip adni = {
2237 .dev = ifp->idev->dev,
2241 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2244 struct arg_dev_net {
2245 struct net_device *dev;
2249 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2251 const struct arg_dev_net *adn = arg;
2252 const struct net_device *dev = adn->dev;
2254 if ((rt->dst.dev == dev || !dev) &&
2255 rt != adn->net->ipv6.ip6_null_entry)
2261 void rt6_ifdown(struct net *net, struct net_device *dev)
2263 struct arg_dev_net adn = {
2268 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2269 icmp6_clean_all(fib6_ifdown, &adn);
2272 struct rt6_mtu_change_arg {
2273 struct net_device *dev;
2277 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2279 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2280 struct inet6_dev *idev;
2282 /* In IPv6 pmtu discovery is not optional,
2283 so that RTAX_MTU lock cannot disable it.
2284 We still use this lock to block changes
2285 caused by addrconf/ndisc.
2288 idev = __in6_dev_get(arg->dev);
2292 /* For administrative MTU increase, there is no way to discover
2293 IPv6 PMTU increase, so PMTU increase should be updated here.
2294 Since RFC 1981 doesn't include administrative MTU increase
2295 update PMTU increase is a MUST. (i.e. jumbo frame)
2298 If new MTU is less than route PMTU, this new MTU will be the
2299 lowest MTU in the path, update the route PMTU to reflect PMTU
2300 decreases; if new MTU is greater than route PMTU, and the
2301 old MTU is the lowest MTU in the path, update the route PMTU
2302 to reflect the increase. In this case if the other nodes' MTU
2303 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2306 if (rt->dst.dev == arg->dev &&
2307 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2308 (dst_mtu(&rt->dst) >= arg->mtu ||
2309 (dst_mtu(&rt->dst) < arg->mtu &&
2310 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2311 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2316 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2318 struct rt6_mtu_change_arg arg = {
2323 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2326 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2327 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2328 [RTA_OIF] = { .type = NLA_U32 },
2329 [RTA_IIF] = { .type = NLA_U32 },
2330 [RTA_PRIORITY] = { .type = NLA_U32 },
2331 [RTA_METRICS] = { .type = NLA_NESTED },
2332 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2335 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2336 struct fib6_config *cfg)
2339 struct nlattr *tb[RTA_MAX+1];
2342 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2347 rtm = nlmsg_data(nlh);
2348 memset(cfg, 0, sizeof(*cfg));
2350 cfg->fc_table = rtm->rtm_table;
2351 cfg->fc_dst_len = rtm->rtm_dst_len;
2352 cfg->fc_src_len = rtm->rtm_src_len;
2353 cfg->fc_flags = RTF_UP;
2354 cfg->fc_protocol = rtm->rtm_protocol;
2355 cfg->fc_type = rtm->rtm_type;
2357 if (rtm->rtm_type == RTN_UNREACHABLE ||
2358 rtm->rtm_type == RTN_BLACKHOLE ||
2359 rtm->rtm_type == RTN_PROHIBIT ||
2360 rtm->rtm_type == RTN_THROW)
2361 cfg->fc_flags |= RTF_REJECT;
2363 if (rtm->rtm_type == RTN_LOCAL)
2364 cfg->fc_flags |= RTF_LOCAL;
2366 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2367 cfg->fc_nlinfo.nlh = nlh;
2368 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2370 if (tb[RTA_GATEWAY]) {
2371 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2372 cfg->fc_flags |= RTF_GATEWAY;
2376 int plen = (rtm->rtm_dst_len + 7) >> 3;
2378 if (nla_len(tb[RTA_DST]) < plen)
2381 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2385 int plen = (rtm->rtm_src_len + 7) >> 3;
2387 if (nla_len(tb[RTA_SRC]) < plen)
2390 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2393 if (tb[RTA_PREFSRC])
2394 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2397 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2399 if (tb[RTA_PRIORITY])
2400 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2402 if (tb[RTA_METRICS]) {
2403 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2404 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2408 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2410 if (tb[RTA_MULTIPATH]) {
2411 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2412 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2420 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2422 struct fib6_config r_cfg;
2423 struct rtnexthop *rtnh;
2426 int err = 0, last_err = 0;
2429 rtnh = (struct rtnexthop *)cfg->fc_mp;
2430 remaining = cfg->fc_mp_len;
2432 /* Parse a Multipath Entry */
2433 while (rtnh_ok(rtnh, remaining)) {
2434 memcpy(&r_cfg, cfg, sizeof(*cfg));
2435 if (rtnh->rtnh_ifindex)
2436 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2438 attrlen = rtnh_attrlen(rtnh);
2440 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2442 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2444 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2445 r_cfg.fc_flags |= RTF_GATEWAY;
2448 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2451 /* If we are trying to remove a route, do not stop the
2452 * loop when ip6_route_del() fails (because next hop is
2453 * already gone), we should try to remove all next hops.
2456 /* If add fails, we should try to delete all
2457 * next hops that have been already added.
2463 /* Because each route is added like a single route we remove
2464 * this flag after the first nexthop (if there is a collision,
2465 * we have already fail to add the first nexthop:
2466 * fib6_add_rt2node() has reject it).
2468 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2469 rtnh = rtnh_next(rtnh, &remaining);
2475 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2477 struct fib6_config cfg;
2480 err = rtm_to_fib6_config(skb, nlh, &cfg);
2485 return ip6_route_multipath(&cfg, 0);
2487 return ip6_route_del(&cfg);
2490 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2492 struct fib6_config cfg;
2495 err = rtm_to_fib6_config(skb, nlh, &cfg);
2500 return ip6_route_multipath(&cfg, 1);
2502 return ip6_route_add(&cfg);
2505 static inline size_t rt6_nlmsg_size(void)
2507 return NLMSG_ALIGN(sizeof(struct rtmsg))
2508 + nla_total_size(16) /* RTA_SRC */
2509 + nla_total_size(16) /* RTA_DST */
2510 + nla_total_size(16) /* RTA_GATEWAY */
2511 + nla_total_size(16) /* RTA_PREFSRC */
2512 + nla_total_size(4) /* RTA_TABLE */
2513 + nla_total_size(4) /* RTA_IIF */
2514 + nla_total_size(4) /* RTA_OIF */
2515 + nla_total_size(4) /* RTA_PRIORITY */
2516 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2517 + nla_total_size(sizeof(struct rta_cacheinfo));
2520 static int rt6_fill_node(struct net *net,
2521 struct sk_buff *skb, struct rt6_info *rt,
2522 struct in6_addr *dst, struct in6_addr *src,
2523 int iif, int type, u32 portid, u32 seq,
2524 int prefix, int nowait, unsigned int flags)
2527 struct nlmsghdr *nlh;
2531 if (prefix) { /* user wants prefix routes only */
2532 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2533 /* success since this is not a prefix route */
2538 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2542 rtm = nlmsg_data(nlh);
2543 rtm->rtm_family = AF_INET6;
2544 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2545 rtm->rtm_src_len = rt->rt6i_src.plen;
2548 table = rt->rt6i_table->tb6_id;
2550 table = RT6_TABLE_UNSPEC;
2551 rtm->rtm_table = table;
2552 if (nla_put_u32(skb, RTA_TABLE, table))
2553 goto nla_put_failure;
2554 if (rt->rt6i_flags & RTF_REJECT) {
2555 switch (rt->dst.error) {
2557 rtm->rtm_type = RTN_BLACKHOLE;
2560 rtm->rtm_type = RTN_PROHIBIT;
2563 rtm->rtm_type = RTN_THROW;
2566 rtm->rtm_type = RTN_UNREACHABLE;
2570 else if (rt->rt6i_flags & RTF_LOCAL)
2571 rtm->rtm_type = RTN_LOCAL;
2572 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2573 rtm->rtm_type = RTN_LOCAL;
2575 rtm->rtm_type = RTN_UNICAST;
2577 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2578 rtm->rtm_protocol = rt->rt6i_protocol;
2579 if (rt->rt6i_flags & RTF_DYNAMIC)
2580 rtm->rtm_protocol = RTPROT_REDIRECT;
2581 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2582 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2583 rtm->rtm_protocol = RTPROT_RA;
2585 rtm->rtm_protocol = RTPROT_KERNEL;
2588 if (rt->rt6i_flags & RTF_CACHE)
2589 rtm->rtm_flags |= RTM_F_CLONED;
2592 if (nla_put(skb, RTA_DST, 16, dst))
2593 goto nla_put_failure;
2594 rtm->rtm_dst_len = 128;
2595 } else if (rtm->rtm_dst_len)
2596 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2597 goto nla_put_failure;
2598 #ifdef CONFIG_IPV6_SUBTREES
2600 if (nla_put(skb, RTA_SRC, 16, src))
2601 goto nla_put_failure;
2602 rtm->rtm_src_len = 128;
2603 } else if (rtm->rtm_src_len &&
2604 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2605 goto nla_put_failure;
2608 #ifdef CONFIG_IPV6_MROUTE
2609 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2610 int err = ip6mr_get_route(net, skb, rtm, nowait);
2615 goto nla_put_failure;
2617 if (err == -EMSGSIZE)
2618 goto nla_put_failure;
2623 if (nla_put_u32(skb, RTA_IIF, iif))
2624 goto nla_put_failure;
2626 struct in6_addr saddr_buf;
2627 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2628 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2629 goto nla_put_failure;
2632 if (rt->rt6i_prefsrc.plen) {
2633 struct in6_addr saddr_buf;
2634 saddr_buf = rt->rt6i_prefsrc.addr;
2635 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2636 goto nla_put_failure;
2639 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2640 goto nla_put_failure;
2642 if (rt->rt6i_flags & RTF_GATEWAY) {
2643 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2644 goto nla_put_failure;
2648 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2649 goto nla_put_failure;
2650 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2651 goto nla_put_failure;
2653 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2655 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2656 goto nla_put_failure;
2658 return nlmsg_end(skb, nlh);
2661 nlmsg_cancel(skb, nlh);
2665 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2667 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2670 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2671 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2672 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2676 return rt6_fill_node(arg->net,
2677 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2678 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2679 prefix, 0, NLM_F_MULTI);
2682 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2684 struct net *net = sock_net(in_skb->sk);
2685 struct nlattr *tb[RTA_MAX+1];
2686 struct rt6_info *rt;
2687 struct sk_buff *skb;
2690 int err, iif = 0, oif = 0;
2692 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2697 memset(&fl6, 0, sizeof(fl6));
2700 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2703 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2707 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2710 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2714 iif = nla_get_u32(tb[RTA_IIF]);
2717 oif = nla_get_u32(tb[RTA_OIF]);
2720 struct net_device *dev;
2723 dev = __dev_get_by_index(net, iif);
2729 fl6.flowi6_iif = iif;
2731 if (!ipv6_addr_any(&fl6.saddr))
2732 flags |= RT6_LOOKUP_F_HAS_SADDR;
2734 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2737 fl6.flowi6_oif = oif;
2739 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2742 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2749 /* Reserve room for dummy headers, this skb can pass
2750 through good chunk of routing engine.
2752 skb_reset_mac_header(skb);
2753 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2755 skb_dst_set(skb, &rt->dst);
2757 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2758 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2759 nlh->nlmsg_seq, 0, 0, 0);
2765 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2770 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2772 struct sk_buff *skb;
2773 struct net *net = info->nl_net;
2778 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2780 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2784 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2785 event, info->portid, seq, 0, 0, 0);
2787 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2788 WARN_ON(err == -EMSGSIZE);
2792 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2793 info->nlh, gfp_any());
2797 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2800 static int ip6_route_dev_notify(struct notifier_block *this,
2801 unsigned long event, void *ptr)
2803 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2804 struct net *net = dev_net(dev);
2806 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2807 net->ipv6.ip6_null_entry->dst.dev = dev;
2808 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2809 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2810 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2811 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2812 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2813 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2824 #ifdef CONFIG_PROC_FS
2826 static const struct file_operations ipv6_route_proc_fops = {
2827 .owner = THIS_MODULE,
2828 .open = ipv6_route_open,
2830 .llseek = seq_lseek,
2831 .release = seq_release_net,
2834 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2836 struct net *net = (struct net *)seq->private;
2837 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2838 net->ipv6.rt6_stats->fib_nodes,
2839 net->ipv6.rt6_stats->fib_route_nodes,
2840 net->ipv6.rt6_stats->fib_rt_alloc,
2841 net->ipv6.rt6_stats->fib_rt_entries,
2842 net->ipv6.rt6_stats->fib_rt_cache,
2843 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2844 net->ipv6.rt6_stats->fib_discarded_routes);
2849 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2851 return single_open_net(inode, file, rt6_stats_seq_show);
2854 static const struct file_operations rt6_stats_seq_fops = {
2855 .owner = THIS_MODULE,
2856 .open = rt6_stats_seq_open,
2858 .llseek = seq_lseek,
2859 .release = single_release_net,
2861 #endif /* CONFIG_PROC_FS */
2863 #ifdef CONFIG_SYSCTL
2866 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2867 void __user *buffer, size_t *lenp, loff_t *ppos)
2874 net = (struct net *)ctl->extra1;
2875 delay = net->ipv6.sysctl.flush_delay;
2876 proc_dointvec(ctl, write, buffer, lenp, ppos);
2877 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2881 struct ctl_table ipv6_route_table_template[] = {
2883 .procname = "flush",
2884 .data = &init_net.ipv6.sysctl.flush_delay,
2885 .maxlen = sizeof(int),
2887 .proc_handler = ipv6_sysctl_rtcache_flush
2890 .procname = "gc_thresh",
2891 .data = &ip6_dst_ops_template.gc_thresh,
2892 .maxlen = sizeof(int),
2894 .proc_handler = proc_dointvec,
2897 .procname = "max_size",
2898 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2899 .maxlen = sizeof(int),
2901 .proc_handler = proc_dointvec,
2904 .procname = "gc_min_interval",
2905 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2906 .maxlen = sizeof(int),
2908 .proc_handler = proc_dointvec_jiffies,
2911 .procname = "gc_timeout",
2912 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2913 .maxlen = sizeof(int),
2915 .proc_handler = proc_dointvec_jiffies,
2918 .procname = "gc_interval",
2919 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2920 .maxlen = sizeof(int),
2922 .proc_handler = proc_dointvec_jiffies,
2925 .procname = "gc_elasticity",
2926 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2927 .maxlen = sizeof(int),
2929 .proc_handler = proc_dointvec,
2932 .procname = "mtu_expires",
2933 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2934 .maxlen = sizeof(int),
2936 .proc_handler = proc_dointvec_jiffies,
2939 .procname = "min_adv_mss",
2940 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2941 .maxlen = sizeof(int),
2943 .proc_handler = proc_dointvec,
2946 .procname = "gc_min_interval_ms",
2947 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2948 .maxlen = sizeof(int),
2950 .proc_handler = proc_dointvec_ms_jiffies,
2955 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2957 struct ctl_table *table;
2959 table = kmemdup(ipv6_route_table_template,
2960 sizeof(ipv6_route_table_template),
2964 table[0].data = &net->ipv6.sysctl.flush_delay;
2965 table[0].extra1 = net;
2966 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2967 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2968 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2969 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2970 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2971 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2972 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2973 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2974 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2976 /* Don't export sysctls to unprivileged users */
2977 if (net->user_ns != &init_user_ns)
2978 table[0].procname = NULL;
2985 static int __net_init ip6_route_net_init(struct net *net)
2989 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2990 sizeof(net->ipv6.ip6_dst_ops));
2992 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2993 goto out_ip6_dst_ops;
2995 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2996 sizeof(*net->ipv6.ip6_null_entry),
2998 if (!net->ipv6.ip6_null_entry)
2999 goto out_ip6_dst_entries;
3000 net->ipv6.ip6_null_entry->dst.path =
3001 (struct dst_entry *)net->ipv6.ip6_null_entry;
3002 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3003 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3004 ip6_template_metrics, true);
3006 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3007 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3008 sizeof(*net->ipv6.ip6_prohibit_entry),
3010 if (!net->ipv6.ip6_prohibit_entry)
3011 goto out_ip6_null_entry;
3012 net->ipv6.ip6_prohibit_entry->dst.path =
3013 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3014 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3015 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3016 ip6_template_metrics, true);
3018 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3019 sizeof(*net->ipv6.ip6_blk_hole_entry),
3021 if (!net->ipv6.ip6_blk_hole_entry)
3022 goto out_ip6_prohibit_entry;
3023 net->ipv6.ip6_blk_hole_entry->dst.path =
3024 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3025 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3026 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3027 ip6_template_metrics, true);
3030 net->ipv6.sysctl.flush_delay = 0;
3031 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3032 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3033 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3034 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3035 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3036 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3037 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3039 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3045 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3046 out_ip6_prohibit_entry:
3047 kfree(net->ipv6.ip6_prohibit_entry);
3049 kfree(net->ipv6.ip6_null_entry);
3051 out_ip6_dst_entries:
3052 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3057 static void __net_exit ip6_route_net_exit(struct net *net)
3059 kfree(net->ipv6.ip6_null_entry);
3060 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3061 kfree(net->ipv6.ip6_prohibit_entry);
3062 kfree(net->ipv6.ip6_blk_hole_entry);
3064 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3067 static int __net_init ip6_route_net_init_late(struct net *net)
3069 #ifdef CONFIG_PROC_FS
3070 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3071 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3076 static void __net_exit ip6_route_net_exit_late(struct net *net)
3078 #ifdef CONFIG_PROC_FS
3079 remove_proc_entry("ipv6_route", net->proc_net);
3080 remove_proc_entry("rt6_stats", net->proc_net);
3084 static struct pernet_operations ip6_route_net_ops = {
3085 .init = ip6_route_net_init,
3086 .exit = ip6_route_net_exit,
3089 static int __net_init ipv6_inetpeer_init(struct net *net)
3091 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3095 inet_peer_base_init(bp);
3096 net->ipv6.peers = bp;
3100 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3102 struct inet_peer_base *bp = net->ipv6.peers;
3104 net->ipv6.peers = NULL;
3105 inetpeer_invalidate_tree(bp);
3109 static struct pernet_operations ipv6_inetpeer_ops = {
3110 .init = ipv6_inetpeer_init,
3111 .exit = ipv6_inetpeer_exit,
3114 static struct pernet_operations ip6_route_net_late_ops = {
3115 .init = ip6_route_net_init_late,
3116 .exit = ip6_route_net_exit_late,
3119 static struct notifier_block ip6_route_dev_notifier = {
3120 .notifier_call = ip6_route_dev_notify,
3124 int __init ip6_route_init(void)
3129 ip6_dst_ops_template.kmem_cachep =
3130 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3131 SLAB_HWCACHE_ALIGN, NULL);
3132 if (!ip6_dst_ops_template.kmem_cachep)
3135 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3137 goto out_kmem_cache;
3139 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3141 goto out_dst_entries;
3143 ret = register_pernet_subsys(&ip6_route_net_ops);
3145 goto out_register_inetpeer;
3147 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3149 /* Registering of the loopback is done before this portion of code,
3150 * the loopback reference in rt6_info will not be taken, do it
3151 * manually for init_net */
3152 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3153 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3154 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3155 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3156 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3157 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3158 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3162 goto out_register_subsys;
3168 ret = fib6_rules_init();
3172 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3174 goto fib6_rules_init;
3177 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3178 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3179 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3180 goto out_register_late_subsys;
3182 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3184 goto out_register_late_subsys;
3189 out_register_late_subsys:
3190 unregister_pernet_subsys(&ip6_route_net_late_ops);
3192 fib6_rules_cleanup();
3197 out_register_subsys:
3198 unregister_pernet_subsys(&ip6_route_net_ops);
3199 out_register_inetpeer:
3200 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3202 dst_entries_destroy(&ip6_dst_blackhole_ops);
3204 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3208 void ip6_route_cleanup(void)
3210 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3211 unregister_pernet_subsys(&ip6_route_net_late_ops);
3212 fib6_rules_cleanup();
3215 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3216 unregister_pernet_subsys(&ip6_route_net_ops);
3217 dst_entries_destroy(&ip6_dst_blackhole_ops);
3218 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);