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 sk_buff *skb);
88 static int ip6_pkt_prohibit(struct sk_buff *skb);
89 static int ip6_pkt_prohibit_out(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 u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
109 struct rt6_info *rt = (struct rt6_info *) dst;
110 struct inet_peer *peer;
113 if (!(rt->dst.flags & DST_HOST))
116 peer = rt6_get_peer_create(rt);
118 u32 *old_p = __DST_METRICS_PTR(old);
119 unsigned long prev, new;
122 if (inet_metrics_new(peer))
123 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
125 new = (unsigned long) p;
126 prev = cmpxchg(&dst->_metrics, old, new);
129 p = __DST_METRICS_PTR(prev);
130 if (prev & DST_METRICS_READ_ONLY)
137 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
141 struct in6_addr *p = &rt->rt6i_gateway;
143 if (!ipv6_addr_any(p))
144 return (const void *) p;
146 return &ipv6_hdr(skb)->daddr;
150 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
154 struct rt6_info *rt = (struct rt6_info *) dst;
157 daddr = choose_neigh_daddr(rt, skb, daddr);
158 n = __ipv6_neigh_lookup(dst->dev, daddr);
161 return neigh_create(&nd_tbl, daddr, dst->dev);
164 static struct dst_ops ip6_dst_ops_template = {
166 .protocol = cpu_to_be16(ETH_P_IPV6),
169 .check = ip6_dst_check,
170 .default_advmss = ip6_default_advmss,
172 .cow_metrics = ipv6_cow_metrics,
173 .destroy = ip6_dst_destroy,
174 .ifdown = ip6_dst_ifdown,
175 .negative_advice = ip6_negative_advice,
176 .link_failure = ip6_link_failure,
177 .update_pmtu = ip6_rt_update_pmtu,
178 .redirect = rt6_do_redirect,
179 .local_out = __ip6_local_out,
180 .neigh_lookup = ip6_neigh_lookup,
183 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
185 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
187 return mtu ? : dst->dev->mtu;
190 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
191 struct sk_buff *skb, u32 mtu)
195 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
200 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
206 static struct dst_ops ip6_dst_blackhole_ops = {
208 .protocol = cpu_to_be16(ETH_P_IPV6),
209 .destroy = ip6_dst_destroy,
210 .check = ip6_dst_check,
211 .mtu = ip6_blackhole_mtu,
212 .default_advmss = ip6_default_advmss,
213 .update_pmtu = ip6_rt_blackhole_update_pmtu,
214 .redirect = ip6_rt_blackhole_redirect,
215 .cow_metrics = ip6_rt_blackhole_cow_metrics,
216 .neigh_lookup = ip6_neigh_lookup,
219 static const u32 ip6_template_metrics[RTAX_MAX] = {
220 [RTAX_HOPLIMIT - 1] = 0,
223 static const struct rt6_info ip6_null_entry_template = {
225 .__refcnt = ATOMIC_INIT(1),
227 .obsolete = DST_OBSOLETE_FORCE_CHK,
228 .error = -ENETUNREACH,
229 .input = ip6_pkt_discard,
230 .output = ip6_pkt_discard_out,
232 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
233 .rt6i_protocol = RTPROT_KERNEL,
234 .rt6i_metric = ~(u32) 0,
235 .rt6i_ref = ATOMIC_INIT(1),
238 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
240 static const struct rt6_info ip6_prohibit_entry_template = {
242 .__refcnt = ATOMIC_INIT(1),
244 .obsolete = DST_OBSOLETE_FORCE_CHK,
246 .input = ip6_pkt_prohibit,
247 .output = ip6_pkt_prohibit_out,
249 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
250 .rt6i_protocol = RTPROT_KERNEL,
251 .rt6i_metric = ~(u32) 0,
252 .rt6i_ref = ATOMIC_INIT(1),
255 static const struct rt6_info ip6_blk_hole_entry_template = {
257 .__refcnt = ATOMIC_INIT(1),
259 .obsolete = DST_OBSOLETE_FORCE_CHK,
261 .input = dst_discard,
262 .output = dst_discard,
264 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
265 .rt6i_protocol = RTPROT_KERNEL,
266 .rt6i_metric = ~(u32) 0,
267 .rt6i_ref = ATOMIC_INIT(1),
272 /* allocate dst with ip6_dst_ops */
273 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
274 struct net_device *dev,
276 struct fib6_table *table)
278 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
279 0, DST_OBSOLETE_FORCE_CHK, flags);
282 struct dst_entry *dst = &rt->dst;
284 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
285 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
286 rt->rt6i_genid = rt_genid_ipv6(net);
287 INIT_LIST_HEAD(&rt->rt6i_siblings);
292 static void ip6_dst_destroy(struct dst_entry *dst)
294 struct rt6_info *rt = (struct rt6_info *)dst;
295 struct inet6_dev *idev = rt->rt6i_idev;
296 struct dst_entry *from = dst->from;
298 if (!(rt->dst.flags & DST_HOST))
299 dst_destroy_metrics_generic(dst);
302 rt->rt6i_idev = NULL;
309 if (rt6_has_peer(rt)) {
310 struct inet_peer *peer = rt6_peer_ptr(rt);
315 void rt6_bind_peer(struct rt6_info *rt, int create)
317 struct inet_peer_base *base;
318 struct inet_peer *peer;
320 base = inetpeer_base_ptr(rt->_rt6i_peer);
324 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
326 if (!rt6_set_peer(rt, peer))
331 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
334 struct rt6_info *rt = (struct rt6_info *)dst;
335 struct inet6_dev *idev = rt->rt6i_idev;
336 struct net_device *loopback_dev =
337 dev_net(dev)->loopback_dev;
339 if (dev != loopback_dev) {
340 if (idev && idev->dev == dev) {
341 struct inet6_dev *loopback_idev =
342 in6_dev_get(loopback_dev);
344 rt->rt6i_idev = loopback_idev;
351 static bool rt6_check_expired(const struct rt6_info *rt)
353 if (rt->rt6i_flags & RTF_EXPIRES) {
354 if (time_after(jiffies, rt->dst.expires))
356 } else if (rt->dst.from) {
357 return rt6_check_expired((struct rt6_info *) rt->dst.from);
362 static bool rt6_need_strict(const struct in6_addr *daddr)
364 return ipv6_addr_type(daddr) &
365 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
368 /* Multipath route selection:
369 * Hash based function using packet header and flowlabel.
370 * Adapted from fib_info_hashfn()
372 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
373 const struct flowi6 *fl6)
375 unsigned int val = fl6->flowi6_proto;
377 val ^= ipv6_addr_hash(&fl6->daddr);
378 val ^= ipv6_addr_hash(&fl6->saddr);
380 /* Work only if this not encapsulated */
381 switch (fl6->flowi6_proto) {
385 val ^= (__force u16)fl6->fl6_sport;
386 val ^= (__force u16)fl6->fl6_dport;
390 val ^= (__force u16)fl6->fl6_icmp_type;
391 val ^= (__force u16)fl6->fl6_icmp_code;
394 /* RFC6438 recommands to use flowlabel */
395 val ^= (__force u32)fl6->flowlabel;
397 /* Perhaps, we need to tune, this function? */
398 val = val ^ (val >> 7) ^ (val >> 12);
399 return val % candidate_count;
402 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
403 struct flowi6 *fl6, int oif,
406 struct rt6_info *sibling, *next_sibling;
409 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
410 /* Don't change the route, if route_choosen == 0
411 * (siblings does not include ourself)
414 list_for_each_entry_safe(sibling, next_sibling,
415 &match->rt6i_siblings, rt6i_siblings) {
417 if (route_choosen == 0) {
418 if (rt6_score_route(sibling, oif, strict) < 0)
428 * Route lookup. Any table->tb6_lock is implied.
431 static inline struct rt6_info *rt6_device_match(struct net *net,
433 const struct in6_addr *saddr,
437 struct rt6_info *local = NULL;
438 struct rt6_info *sprt;
440 if (!oif && ipv6_addr_any(saddr))
443 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
444 struct net_device *dev = sprt->dst.dev;
447 if (dev->ifindex == oif)
449 if (dev->flags & IFF_LOOPBACK) {
450 if (!sprt->rt6i_idev ||
451 sprt->rt6i_idev->dev->ifindex != oif) {
452 if (flags & RT6_LOOKUP_F_IFACE && oif)
454 if (local && (!oif ||
455 local->rt6i_idev->dev->ifindex == oif))
461 if (ipv6_chk_addr(net, saddr, dev,
462 flags & RT6_LOOKUP_F_IFACE))
471 if (flags & RT6_LOOKUP_F_IFACE)
472 return net->ipv6.ip6_null_entry;
478 #ifdef CONFIG_IPV6_ROUTER_PREF
479 struct __rt6_probe_work {
480 struct work_struct work;
481 struct in6_addr target;
482 struct net_device *dev;
485 static void rt6_probe_deferred(struct work_struct *w)
487 struct in6_addr mcaddr;
488 struct __rt6_probe_work *work =
489 container_of(w, struct __rt6_probe_work, work);
491 addrconf_addr_solict_mult(&work->target, &mcaddr);
492 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
497 static void rt6_probe(struct rt6_info *rt)
499 struct neighbour *neigh;
501 * Okay, this does not seem to be appropriate
502 * for now, however, we need to check if it
503 * is really so; aka Router Reachability Probing.
505 * Router Reachability Probe MUST be rate-limited
506 * to no more than one per minute.
508 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
511 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
513 write_lock(&neigh->lock);
514 if (neigh->nud_state & NUD_VALID)
519 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
520 struct __rt6_probe_work *work;
522 work = kmalloc(sizeof(*work), GFP_ATOMIC);
525 __neigh_set_probe_once(neigh);
528 write_unlock(&neigh->lock);
531 INIT_WORK(&work->work, rt6_probe_deferred);
532 work->target = rt->rt6i_gateway;
533 dev_hold(rt->dst.dev);
534 work->dev = rt->dst.dev;
535 schedule_work(&work->work);
539 write_unlock(&neigh->lock);
541 rcu_read_unlock_bh();
544 static inline void rt6_probe(struct rt6_info *rt)
550 * Default Router Selection (RFC 2461 6.3.6)
552 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
554 struct net_device *dev = rt->dst.dev;
555 if (!oif || dev->ifindex == oif)
557 if ((dev->flags & IFF_LOOPBACK) &&
558 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
563 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
565 struct neighbour *neigh;
566 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
568 if (rt->rt6i_flags & RTF_NONEXTHOP ||
569 !(rt->rt6i_flags & RTF_GATEWAY))
570 return RT6_NUD_SUCCEED;
573 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
575 read_lock(&neigh->lock);
576 if (neigh->nud_state & NUD_VALID)
577 ret = RT6_NUD_SUCCEED;
578 #ifdef CONFIG_IPV6_ROUTER_PREF
579 else if (!(neigh->nud_state & NUD_FAILED))
580 ret = RT6_NUD_SUCCEED;
582 ret = RT6_NUD_FAIL_PROBE;
584 read_unlock(&neigh->lock);
586 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
587 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
589 rcu_read_unlock_bh();
594 static int rt6_score_route(struct rt6_info *rt, int oif,
599 m = rt6_check_dev(rt, oif);
600 if (!m && (strict & RT6_LOOKUP_F_IFACE))
601 return RT6_NUD_FAIL_HARD;
602 #ifdef CONFIG_IPV6_ROUTER_PREF
603 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
605 if (strict & RT6_LOOKUP_F_REACHABLE) {
606 int n = rt6_check_neigh(rt);
613 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
614 int *mpri, struct rt6_info *match,
618 bool match_do_rr = false;
620 if (rt6_check_expired(rt))
623 m = rt6_score_route(rt, oif, strict);
624 if (m == RT6_NUD_FAIL_DO_RR) {
626 m = 0; /* lowest valid score */
627 } else if (m == RT6_NUD_FAIL_HARD) {
631 if (strict & RT6_LOOKUP_F_REACHABLE)
634 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
636 *do_rr = match_do_rr;
644 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
645 struct rt6_info *rr_head,
646 u32 metric, int oif, int strict,
649 struct rt6_info *rt, *match;
653 for (rt = rr_head; rt && rt->rt6i_metric == metric;
654 rt = rt->dst.rt6_next)
655 match = find_match(rt, oif, strict, &mpri, match, do_rr);
656 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
657 rt = rt->dst.rt6_next)
658 match = find_match(rt, oif, strict, &mpri, match, do_rr);
663 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
665 struct rt6_info *match, *rt0;
671 fn->rr_ptr = rt0 = fn->leaf;
673 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
677 struct rt6_info *next = rt0->dst.rt6_next;
679 /* no entries matched; do round-robin */
680 if (!next || next->rt6i_metric != rt0->rt6i_metric)
687 net = dev_net(rt0->dst.dev);
688 return match ? match : net->ipv6.ip6_null_entry;
691 #ifdef CONFIG_IPV6_ROUTE_INFO
692 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
693 const struct in6_addr *gwaddr)
695 struct net *net = dev_net(dev);
696 struct route_info *rinfo = (struct route_info *) opt;
697 struct in6_addr prefix_buf, *prefix;
699 unsigned long lifetime;
702 if (len < sizeof(struct route_info)) {
706 /* Sanity check for prefix_len and length */
707 if (rinfo->length > 3) {
709 } else if (rinfo->prefix_len > 128) {
711 } else if (rinfo->prefix_len > 64) {
712 if (rinfo->length < 2) {
715 } else if (rinfo->prefix_len > 0) {
716 if (rinfo->length < 1) {
721 pref = rinfo->route_pref;
722 if (pref == ICMPV6_ROUTER_PREF_INVALID)
725 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
727 if (rinfo->length == 3)
728 prefix = (struct in6_addr *)rinfo->prefix;
730 /* this function is safe */
731 ipv6_addr_prefix(&prefix_buf,
732 (struct in6_addr *)rinfo->prefix,
734 prefix = &prefix_buf;
737 if (rinfo->prefix_len == 0)
738 rt = rt6_get_dflt_router(gwaddr, dev);
740 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
741 gwaddr, dev->ifindex);
743 if (rt && !lifetime) {
749 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
752 rt->rt6i_flags = RTF_ROUTEINFO |
753 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
756 if (!addrconf_finite_timeout(lifetime))
757 rt6_clean_expires(rt);
759 rt6_set_expires(rt, jiffies + HZ * lifetime);
767 #define BACKTRACK(__net, saddr) \
769 if (rt == __net->ipv6.ip6_null_entry) { \
770 struct fib6_node *pn; \
772 if (fn->fn_flags & RTN_TL_ROOT) \
775 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
776 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
779 if (fn->fn_flags & RTN_RTINFO) \
785 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
786 struct fib6_table *table,
787 struct flowi6 *fl6, int flags)
789 struct fib6_node *fn;
792 read_lock_bh(&table->tb6_lock);
793 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
796 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
797 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
798 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
799 BACKTRACK(net, &fl6->saddr);
801 dst_use(&rt->dst, jiffies);
802 read_unlock_bh(&table->tb6_lock);
807 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
810 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
812 EXPORT_SYMBOL_GPL(ip6_route_lookup);
814 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
815 const struct in6_addr *saddr, int oif, int strict)
817 struct flowi6 fl6 = {
821 struct dst_entry *dst;
822 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
825 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
826 flags |= RT6_LOOKUP_F_HAS_SADDR;
829 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
831 return (struct rt6_info *) dst;
838 EXPORT_SYMBOL(rt6_lookup);
840 /* ip6_ins_rt is called with FREE table->tb6_lock.
841 It takes new route entry, the addition fails by any reason the
842 route is freed. In any case, if caller does not hold it, it may
846 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
849 struct fib6_table *table;
851 table = rt->rt6i_table;
852 write_lock_bh(&table->tb6_lock);
853 err = fib6_add(&table->tb6_root, rt, info);
854 write_unlock_bh(&table->tb6_lock);
859 int ip6_ins_rt(struct rt6_info *rt)
861 struct nl_info info = {
862 .nl_net = dev_net(rt->dst.dev),
864 return __ip6_ins_rt(rt, &info);
867 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
868 const struct in6_addr *daddr,
869 const struct in6_addr *saddr)
877 rt = ip6_rt_copy(ort, daddr);
880 if (ort->rt6i_dst.plen != 128 &&
881 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
882 rt->rt6i_flags |= RTF_ANYCAST;
884 rt->rt6i_flags |= RTF_CACHE;
886 #ifdef CONFIG_IPV6_SUBTREES
887 if (rt->rt6i_src.plen && saddr) {
888 rt->rt6i_src.addr = *saddr;
889 rt->rt6i_src.plen = 128;
897 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
898 const struct in6_addr *daddr)
900 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
903 rt->rt6i_flags |= RTF_CACHE;
907 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
908 struct flowi6 *fl6, int flags)
910 struct fib6_node *fn;
911 struct rt6_info *rt, *nrt;
915 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
917 strict |= flags & RT6_LOOKUP_F_IFACE;
920 read_lock_bh(&table->tb6_lock);
923 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
926 rt = rt6_select(fn, oif, strict | reachable);
927 if (rt->rt6i_nsiblings)
928 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
929 BACKTRACK(net, &fl6->saddr);
930 if (rt == net->ipv6.ip6_null_entry ||
931 rt->rt6i_flags & RTF_CACHE)
935 read_unlock_bh(&table->tb6_lock);
937 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
938 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
939 else if (!(rt->dst.flags & DST_HOST))
940 nrt = rt6_alloc_clone(rt, &fl6->daddr);
945 rt = nrt ? : net->ipv6.ip6_null_entry;
949 err = ip6_ins_rt(nrt);
958 * Race condition! In the gap, when table->tb6_lock was
959 * released someone could insert this route. Relookup.
970 read_unlock_bh(&table->tb6_lock);
972 rt->dst.lastuse = jiffies;
978 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
979 struct flowi6 *fl6, int flags)
981 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
984 static struct dst_entry *ip6_route_input_lookup(struct net *net,
985 struct net_device *dev,
986 struct flowi6 *fl6, int flags)
988 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
989 flags |= RT6_LOOKUP_F_IFACE;
991 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
994 void ip6_route_input(struct sk_buff *skb)
996 const struct ipv6hdr *iph = ipv6_hdr(skb);
997 struct net *net = dev_net(skb->dev);
998 int flags = RT6_LOOKUP_F_HAS_SADDR;
999 struct flowi6 fl6 = {
1000 .flowi6_iif = skb->dev->ifindex,
1001 .daddr = iph->daddr,
1002 .saddr = iph->saddr,
1003 .flowlabel = ip6_flowinfo(iph),
1004 .flowi6_mark = skb->mark,
1005 .flowi6_proto = iph->nexthdr,
1008 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1011 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1012 struct flowi6 *fl6, int flags)
1014 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1017 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1022 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1024 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1025 flags |= RT6_LOOKUP_F_IFACE;
1027 if (!ipv6_addr_any(&fl6->saddr))
1028 flags |= RT6_LOOKUP_F_HAS_SADDR;
1030 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1032 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1035 EXPORT_SYMBOL(ip6_route_output);
1037 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1039 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1040 struct dst_entry *new = NULL;
1042 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1046 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1047 rt6_init_peer(rt, net->ipv6.peers);
1050 new->input = dst_discard;
1051 new->output = dst_discard;
1053 if (dst_metrics_read_only(&ort->dst))
1054 new->_metrics = ort->dst._metrics;
1056 dst_copy_metrics(new, &ort->dst);
1057 rt->rt6i_idev = ort->rt6i_idev;
1059 in6_dev_hold(rt->rt6i_idev);
1061 rt->rt6i_gateway = ort->rt6i_gateway;
1062 rt->rt6i_flags = ort->rt6i_flags;
1063 rt->rt6i_metric = 0;
1065 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1066 #ifdef CONFIG_IPV6_SUBTREES
1067 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1073 dst_release(dst_orig);
1074 return new ? new : ERR_PTR(-ENOMEM);
1078 * Destination cache support functions
1081 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1083 struct rt6_info *rt;
1085 rt = (struct rt6_info *) dst;
1087 /* All IPV6 dsts are created with ->obsolete set to the value
1088 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1089 * into this function always.
1091 if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
1094 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1097 if (rt6_check_expired(rt))
1103 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1105 struct rt6_info *rt = (struct rt6_info *) dst;
1108 if (rt->rt6i_flags & RTF_CACHE) {
1109 if (rt6_check_expired(rt)) {
1121 static void ip6_link_failure(struct sk_buff *skb)
1123 struct rt6_info *rt;
1125 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1127 rt = (struct rt6_info *) skb_dst(skb);
1129 if (rt->rt6i_flags & RTF_CACHE) {
1133 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1134 rt->rt6i_node->fn_sernum = -1;
1139 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1140 struct sk_buff *skb, u32 mtu)
1142 struct rt6_info *rt6 = (struct rt6_info*)dst;
1145 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1146 struct net *net = dev_net(dst->dev);
1148 rt6->rt6i_flags |= RTF_MODIFIED;
1149 if (mtu < IPV6_MIN_MTU) {
1150 u32 features = dst_metric(dst, RTAX_FEATURES);
1152 features |= RTAX_FEATURE_ALLFRAG;
1153 dst_metric_set(dst, RTAX_FEATURES, features);
1155 dst_metric_set(dst, RTAX_MTU, mtu);
1156 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1160 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1163 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1164 struct dst_entry *dst;
1167 memset(&fl6, 0, sizeof(fl6));
1168 fl6.flowi6_oif = oif;
1169 fl6.flowi6_mark = mark;
1170 fl6.daddr = iph->daddr;
1171 fl6.saddr = iph->saddr;
1172 fl6.flowlabel = ip6_flowinfo(iph);
1174 dst = ip6_route_output(net, NULL, &fl6);
1176 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1179 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1181 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1183 ip6_update_pmtu(skb, sock_net(sk), mtu,
1184 sk->sk_bound_dev_if, sk->sk_mark);
1186 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1188 /* Handle redirects */
1189 struct ip6rd_flowi {
1191 struct in6_addr gateway;
1194 static struct rt6_info *__ip6_route_redirect(struct net *net,
1195 struct fib6_table *table,
1199 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1200 struct rt6_info *rt;
1201 struct fib6_node *fn;
1203 /* Get the "current" route for this destination and
1204 * check if the redirect has come from approriate router.
1206 * RFC 4861 specifies that redirects should only be
1207 * accepted if they come from the nexthop to the target.
1208 * Due to the way the routes are chosen, this notion
1209 * is a bit fuzzy and one might need to check all possible
1213 read_lock_bh(&table->tb6_lock);
1214 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1216 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1217 if (rt6_check_expired(rt))
1221 if (!(rt->rt6i_flags & RTF_GATEWAY))
1223 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1225 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1231 rt = net->ipv6.ip6_null_entry;
1232 else if (rt->dst.error) {
1233 rt = net->ipv6.ip6_null_entry;
1236 BACKTRACK(net, &fl6->saddr);
1240 read_unlock_bh(&table->tb6_lock);
1245 static struct dst_entry *ip6_route_redirect(struct net *net,
1246 const struct flowi6 *fl6,
1247 const struct in6_addr *gateway)
1249 int flags = RT6_LOOKUP_F_HAS_SADDR;
1250 struct ip6rd_flowi rdfl;
1253 rdfl.gateway = *gateway;
1255 return fib6_rule_lookup(net, &rdfl.fl6,
1256 flags, __ip6_route_redirect);
1259 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1261 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1262 struct dst_entry *dst;
1265 memset(&fl6, 0, sizeof(fl6));
1266 fl6.flowi6_oif = oif;
1267 fl6.flowi6_mark = mark;
1268 fl6.daddr = iph->daddr;
1269 fl6.saddr = iph->saddr;
1270 fl6.flowlabel = ip6_flowinfo(iph);
1272 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1273 rt6_do_redirect(dst, NULL, skb);
1276 EXPORT_SYMBOL_GPL(ip6_redirect);
1278 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1281 const struct ipv6hdr *iph = ipv6_hdr(skb);
1282 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1283 struct dst_entry *dst;
1286 memset(&fl6, 0, sizeof(fl6));
1287 fl6.flowi6_oif = oif;
1288 fl6.flowi6_mark = mark;
1289 fl6.daddr = msg->dest;
1290 fl6.saddr = iph->daddr;
1292 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1293 rt6_do_redirect(dst, NULL, skb);
1297 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1299 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1301 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1303 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1305 struct net_device *dev = dst->dev;
1306 unsigned int mtu = dst_mtu(dst);
1307 struct net *net = dev_net(dev);
1309 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1311 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1312 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1315 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1316 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1317 * IPV6_MAXPLEN is also valid and means: "any MSS,
1318 * rely only on pmtu discovery"
1320 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1325 static unsigned int ip6_mtu(const struct dst_entry *dst)
1327 struct inet6_dev *idev;
1328 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1336 idev = __in6_dev_get(dst->dev);
1338 mtu = idev->cnf.mtu6;
1344 static struct dst_entry *icmp6_dst_gc_list;
1345 static DEFINE_SPINLOCK(icmp6_dst_lock);
1347 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1350 struct dst_entry *dst;
1351 struct rt6_info *rt;
1352 struct inet6_dev *idev = in6_dev_get(dev);
1353 struct net *net = dev_net(dev);
1355 if (unlikely(!idev))
1356 return ERR_PTR(-ENODEV);
1358 rt = ip6_dst_alloc(net, dev, 0, NULL);
1359 if (unlikely(!rt)) {
1361 dst = ERR_PTR(-ENOMEM);
1365 rt->dst.flags |= DST_HOST;
1366 rt->dst.output = ip6_output;
1367 atomic_set(&rt->dst.__refcnt, 1);
1368 rt->rt6i_gateway = fl6->daddr;
1369 rt->rt6i_dst.addr = fl6->daddr;
1370 rt->rt6i_dst.plen = 128;
1371 rt->rt6i_idev = idev;
1372 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1374 spin_lock_bh(&icmp6_dst_lock);
1375 rt->dst.next = icmp6_dst_gc_list;
1376 icmp6_dst_gc_list = &rt->dst;
1377 spin_unlock_bh(&icmp6_dst_lock);
1379 fib6_force_start_gc(net);
1381 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1387 int icmp6_dst_gc(void)
1389 struct dst_entry *dst, **pprev;
1392 spin_lock_bh(&icmp6_dst_lock);
1393 pprev = &icmp6_dst_gc_list;
1395 while ((dst = *pprev) != NULL) {
1396 if (!atomic_read(&dst->__refcnt)) {
1405 spin_unlock_bh(&icmp6_dst_lock);
1410 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1413 struct dst_entry *dst, **pprev;
1415 spin_lock_bh(&icmp6_dst_lock);
1416 pprev = &icmp6_dst_gc_list;
1417 while ((dst = *pprev) != NULL) {
1418 struct rt6_info *rt = (struct rt6_info *) dst;
1419 if (func(rt, arg)) {
1426 spin_unlock_bh(&icmp6_dst_lock);
1429 static int ip6_dst_gc(struct dst_ops *ops)
1431 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1432 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1433 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1434 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1435 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1436 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1439 entries = dst_entries_get_fast(ops);
1440 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1441 entries <= rt_max_size)
1444 net->ipv6.ip6_rt_gc_expire++;
1445 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1446 entries = dst_entries_get_slow(ops);
1447 if (entries < ops->gc_thresh)
1448 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1450 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1451 return entries > rt_max_size;
1458 int ip6_route_add(struct fib6_config *cfg)
1461 struct net *net = cfg->fc_nlinfo.nl_net;
1462 struct rt6_info *rt = NULL;
1463 struct net_device *dev = NULL;
1464 struct inet6_dev *idev = NULL;
1465 struct fib6_table *table;
1468 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1470 #ifndef CONFIG_IPV6_SUBTREES
1471 if (cfg->fc_src_len)
1474 if (cfg->fc_ifindex) {
1476 dev = dev_get_by_index(net, cfg->fc_ifindex);
1479 idev = in6_dev_get(dev);
1484 if (cfg->fc_metric == 0)
1485 cfg->fc_metric = IP6_RT_PRIO_USER;
1488 if (cfg->fc_nlinfo.nlh &&
1489 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1490 table = fib6_get_table(net, cfg->fc_table);
1492 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1493 table = fib6_new_table(net, cfg->fc_table);
1496 table = fib6_new_table(net, cfg->fc_table);
1502 rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);
1509 if (cfg->fc_flags & RTF_EXPIRES)
1510 rt6_set_expires(rt, jiffies +
1511 clock_t_to_jiffies(cfg->fc_expires));
1513 rt6_clean_expires(rt);
1515 if (cfg->fc_protocol == RTPROT_UNSPEC)
1516 cfg->fc_protocol = RTPROT_BOOT;
1517 rt->rt6i_protocol = cfg->fc_protocol;
1519 addr_type = ipv6_addr_type(&cfg->fc_dst);
1521 if (addr_type & IPV6_ADDR_MULTICAST)
1522 rt->dst.input = ip6_mc_input;
1523 else if (cfg->fc_flags & RTF_LOCAL)
1524 rt->dst.input = ip6_input;
1526 rt->dst.input = ip6_forward;
1528 rt->dst.output = ip6_output;
1530 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1531 rt->rt6i_dst.plen = cfg->fc_dst_len;
1532 if (rt->rt6i_dst.plen == 128)
1533 rt->dst.flags |= DST_HOST;
1535 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1536 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1541 dst_init_metrics(&rt->dst, metrics, 0);
1543 #ifdef CONFIG_IPV6_SUBTREES
1544 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1545 rt->rt6i_src.plen = cfg->fc_src_len;
1548 rt->rt6i_metric = cfg->fc_metric;
1550 /* We cannot add true routes via loopback here,
1551 they would result in kernel looping; promote them to reject routes
1553 if ((cfg->fc_flags & RTF_REJECT) ||
1554 (dev && (dev->flags & IFF_LOOPBACK) &&
1555 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1556 !(cfg->fc_flags & RTF_LOCAL))) {
1557 /* hold loopback dev/idev if we haven't done so. */
1558 if (dev != net->loopback_dev) {
1563 dev = net->loopback_dev;
1565 idev = in6_dev_get(dev);
1571 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1572 switch (cfg->fc_type) {
1574 rt->dst.error = -EINVAL;
1575 rt->dst.output = dst_discard;
1576 rt->dst.input = dst_discard;
1579 rt->dst.error = -EACCES;
1580 rt->dst.output = ip6_pkt_prohibit_out;
1581 rt->dst.input = ip6_pkt_prohibit;
1585 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1587 rt->dst.output = ip6_pkt_discard_out;
1588 rt->dst.input = ip6_pkt_discard;
1594 if (cfg->fc_flags & RTF_GATEWAY) {
1595 const struct in6_addr *gw_addr;
1598 gw_addr = &cfg->fc_gateway;
1599 rt->rt6i_gateway = *gw_addr;
1600 gwa_type = ipv6_addr_type(gw_addr);
1602 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1603 struct rt6_info *grt;
1605 /* IPv6 strictly inhibits using not link-local
1606 addresses as nexthop address.
1607 Otherwise, router will not able to send redirects.
1608 It is very good, but in some (rare!) circumstances
1609 (SIT, PtP, NBMA NOARP links) it is handy to allow
1610 some exceptions. --ANK
1613 if (!(gwa_type & IPV6_ADDR_UNICAST))
1616 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1618 err = -EHOSTUNREACH;
1622 if (dev != grt->dst.dev) {
1628 idev = grt->rt6i_idev;
1630 in6_dev_hold(grt->rt6i_idev);
1632 if (!(grt->rt6i_flags & RTF_GATEWAY))
1640 if (!dev || (dev->flags & IFF_LOOPBACK))
1648 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1649 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1653 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1654 rt->rt6i_prefsrc.plen = 128;
1656 rt->rt6i_prefsrc.plen = 0;
1658 rt->rt6i_flags = cfg->fc_flags;
1665 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1666 int type = nla_type(nla);
1669 if (type > RTAX_MAX) {
1674 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1680 rt->rt6i_idev = idev;
1681 rt->rt6i_table = table;
1683 cfg->fc_nlinfo.nl_net = dev_net(dev);
1685 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1697 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1700 struct fib6_table *table;
1701 struct net *net = dev_net(rt->dst.dev);
1703 if (rt == net->ipv6.ip6_null_entry) {
1708 table = rt->rt6i_table;
1709 write_lock_bh(&table->tb6_lock);
1710 err = fib6_del(rt, info);
1711 write_unlock_bh(&table->tb6_lock);
1718 int ip6_del_rt(struct rt6_info *rt)
1720 struct nl_info info = {
1721 .nl_net = dev_net(rt->dst.dev),
1723 return __ip6_del_rt(rt, &info);
1726 static int ip6_route_del(struct fib6_config *cfg)
1728 struct fib6_table *table;
1729 struct fib6_node *fn;
1730 struct rt6_info *rt;
1733 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1737 read_lock_bh(&table->tb6_lock);
1739 fn = fib6_locate(&table->tb6_root,
1740 &cfg->fc_dst, cfg->fc_dst_len,
1741 &cfg->fc_src, cfg->fc_src_len);
1744 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1745 if (cfg->fc_ifindex &&
1747 rt->dst.dev->ifindex != cfg->fc_ifindex))
1749 if (cfg->fc_flags & RTF_GATEWAY &&
1750 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1752 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1755 read_unlock_bh(&table->tb6_lock);
1757 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1760 read_unlock_bh(&table->tb6_lock);
1765 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1767 struct net *net = dev_net(skb->dev);
1768 struct netevent_redirect netevent;
1769 struct rt6_info *rt, *nrt = NULL;
1770 struct ndisc_options ndopts;
1771 struct inet6_dev *in6_dev;
1772 struct neighbour *neigh;
1774 int optlen, on_link;
1777 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1778 optlen -= sizeof(*msg);
1781 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1785 msg = (struct rd_msg *)icmp6_hdr(skb);
1787 if (ipv6_addr_is_multicast(&msg->dest)) {
1788 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1793 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1795 } else if (ipv6_addr_type(&msg->target) !=
1796 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1797 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1801 in6_dev = __in6_dev_get(skb->dev);
1804 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1808 * The IP source address of the Redirect MUST be the same as the current
1809 * first-hop router for the specified ICMP Destination Address.
1812 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1813 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1818 if (ndopts.nd_opts_tgt_lladdr) {
1819 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1822 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1827 rt = (struct rt6_info *) dst;
1828 if (rt == net->ipv6.ip6_null_entry) {
1829 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1833 /* Redirect received -> path was valid.
1834 * Look, redirects are sent only in response to data packets,
1835 * so that this nexthop apparently is reachable. --ANK
1837 dst_confirm(&rt->dst);
1839 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1844 * We have finally decided to accept it.
1847 neigh_update(neigh, lladdr, NUD_STALE,
1848 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1849 NEIGH_UPDATE_F_OVERRIDE|
1850 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1851 NEIGH_UPDATE_F_ISROUTER))
1854 nrt = ip6_rt_copy(rt, &msg->dest);
1858 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1860 nrt->rt6i_flags &= ~RTF_GATEWAY;
1862 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1864 if (ip6_ins_rt(nrt))
1867 netevent.old = &rt->dst;
1868 netevent.new = &nrt->dst;
1869 netevent.daddr = &msg->dest;
1870 netevent.neigh = neigh;
1871 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1873 if (rt->rt6i_flags & RTF_CACHE) {
1874 rt = (struct rt6_info *) dst_clone(&rt->dst);
1879 neigh_release(neigh);
1883 * Misc support functions
1886 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1887 const struct in6_addr *dest)
1889 struct net *net = dev_net(ort->dst.dev);
1890 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1894 rt->dst.input = ort->dst.input;
1895 rt->dst.output = ort->dst.output;
1896 rt->dst.flags |= DST_HOST;
1898 rt->rt6i_dst.addr = *dest;
1899 rt->rt6i_dst.plen = 128;
1900 dst_copy_metrics(&rt->dst, &ort->dst);
1901 rt->dst.error = ort->dst.error;
1902 rt->rt6i_idev = ort->rt6i_idev;
1904 in6_dev_hold(rt->rt6i_idev);
1905 rt->dst.lastuse = jiffies;
1907 if (ort->rt6i_flags & RTF_GATEWAY)
1908 rt->rt6i_gateway = ort->rt6i_gateway;
1910 rt->rt6i_gateway = *dest;
1911 rt->rt6i_flags = ort->rt6i_flags;
1912 if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) ==
1913 (RTF_DEFAULT | RTF_ADDRCONF))
1914 rt6_set_from(rt, ort);
1915 rt->rt6i_metric = 0;
1917 #ifdef CONFIG_IPV6_SUBTREES
1918 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1920 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1921 rt->rt6i_table = ort->rt6i_table;
1926 #ifdef CONFIG_IPV6_ROUTE_INFO
1927 static struct rt6_info *rt6_get_route_info(struct net *net,
1928 const struct in6_addr *prefix, int prefixlen,
1929 const struct in6_addr *gwaddr, int ifindex)
1931 struct fib6_node *fn;
1932 struct rt6_info *rt = NULL;
1933 struct fib6_table *table;
1935 table = fib6_get_table(net, RT6_TABLE_INFO);
1939 read_lock_bh(&table->tb6_lock);
1940 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1944 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1945 if (rt->dst.dev->ifindex != ifindex)
1947 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1949 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1955 read_unlock_bh(&table->tb6_lock);
1959 static struct rt6_info *rt6_add_route_info(struct net *net,
1960 const struct in6_addr *prefix, int prefixlen,
1961 const struct in6_addr *gwaddr, int ifindex,
1964 struct fib6_config cfg = {
1965 .fc_table = RT6_TABLE_INFO,
1966 .fc_metric = IP6_RT_PRIO_USER,
1967 .fc_ifindex = ifindex,
1968 .fc_dst_len = prefixlen,
1969 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1970 RTF_UP | RTF_PREF(pref),
1971 .fc_nlinfo.portid = 0,
1972 .fc_nlinfo.nlh = NULL,
1973 .fc_nlinfo.nl_net = net,
1976 cfg.fc_dst = *prefix;
1977 cfg.fc_gateway = *gwaddr;
1979 /* We should treat it as a default route if prefix length is 0. */
1981 cfg.fc_flags |= RTF_DEFAULT;
1983 ip6_route_add(&cfg);
1985 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1989 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1991 struct rt6_info *rt;
1992 struct fib6_table *table;
1994 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1998 read_lock_bh(&table->tb6_lock);
1999 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
2000 if (dev == rt->dst.dev &&
2001 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
2002 ipv6_addr_equal(&rt->rt6i_gateway, addr))
2007 read_unlock_bh(&table->tb6_lock);
2011 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
2012 struct net_device *dev,
2015 struct fib6_config cfg = {
2016 .fc_table = RT6_TABLE_DFLT,
2017 .fc_metric = IP6_RT_PRIO_USER,
2018 .fc_ifindex = dev->ifindex,
2019 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2020 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2021 .fc_nlinfo.portid = 0,
2022 .fc_nlinfo.nlh = NULL,
2023 .fc_nlinfo.nl_net = dev_net(dev),
2026 cfg.fc_gateway = *gwaddr;
2028 ip6_route_add(&cfg);
2030 return rt6_get_dflt_router(gwaddr, dev);
2033 void rt6_purge_dflt_routers(struct net *net)
2035 struct rt6_info *rt;
2036 struct fib6_table *table;
2038 /* NOTE: Keep consistent with rt6_get_dflt_router */
2039 table = fib6_get_table(net, RT6_TABLE_DFLT);
2044 read_lock_bh(&table->tb6_lock);
2045 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2046 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2047 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2049 read_unlock_bh(&table->tb6_lock);
2054 read_unlock_bh(&table->tb6_lock);
2057 static void rtmsg_to_fib6_config(struct net *net,
2058 struct in6_rtmsg *rtmsg,
2059 struct fib6_config *cfg)
2061 memset(cfg, 0, sizeof(*cfg));
2063 cfg->fc_table = RT6_TABLE_MAIN;
2064 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2065 cfg->fc_metric = rtmsg->rtmsg_metric;
2066 cfg->fc_expires = rtmsg->rtmsg_info;
2067 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2068 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2069 cfg->fc_flags = rtmsg->rtmsg_flags;
2071 cfg->fc_nlinfo.nl_net = net;
2073 cfg->fc_dst = rtmsg->rtmsg_dst;
2074 cfg->fc_src = rtmsg->rtmsg_src;
2075 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2078 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2080 struct fib6_config cfg;
2081 struct in6_rtmsg rtmsg;
2085 case SIOCADDRT: /* Add a route */
2086 case SIOCDELRT: /* Delete a route */
2087 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2089 err = copy_from_user(&rtmsg, arg,
2090 sizeof(struct in6_rtmsg));
2094 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2099 err = ip6_route_add(&cfg);
2102 err = ip6_route_del(&cfg);
2116 * Drop the packet on the floor
2119 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2122 struct dst_entry *dst = skb_dst(skb);
2123 switch (ipstats_mib_noroutes) {
2124 case IPSTATS_MIB_INNOROUTES:
2125 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2126 if (type == IPV6_ADDR_ANY) {
2127 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2128 IPSTATS_MIB_INADDRERRORS);
2132 case IPSTATS_MIB_OUTNOROUTES:
2133 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2134 ipstats_mib_noroutes);
2137 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2142 static int ip6_pkt_discard(struct sk_buff *skb)
2144 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2147 static int ip6_pkt_discard_out(struct sk_buff *skb)
2149 skb->dev = skb_dst(skb)->dev;
2150 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2153 static int ip6_pkt_prohibit(struct sk_buff *skb)
2155 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2158 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2160 skb->dev = skb_dst(skb)->dev;
2161 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2165 * Allocate a dst for local (unicast / anycast) address.
2168 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2169 const struct in6_addr *addr,
2172 struct net *net = dev_net(idev->dev);
2173 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL);
2176 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
2177 return ERR_PTR(-ENOMEM);
2182 rt->dst.flags |= DST_HOST;
2183 rt->dst.input = ip6_input;
2184 rt->dst.output = ip6_output;
2185 rt->rt6i_idev = idev;
2187 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2189 rt->rt6i_flags |= RTF_ANYCAST;
2191 rt->rt6i_flags |= RTF_LOCAL;
2193 rt->rt6i_gateway = *addr;
2194 rt->rt6i_dst.addr = *addr;
2195 rt->rt6i_dst.plen = 128;
2196 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2198 atomic_set(&rt->dst.__refcnt, 1);
2203 int ip6_route_get_saddr(struct net *net,
2204 struct rt6_info *rt,
2205 const struct in6_addr *daddr,
2207 struct in6_addr *saddr)
2209 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2211 if (rt->rt6i_prefsrc.plen)
2212 *saddr = rt->rt6i_prefsrc.addr;
2214 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2215 daddr, prefs, saddr);
2219 /* remove deleted ip from prefsrc entries */
2220 struct arg_dev_net_ip {
2221 struct net_device *dev;
2223 struct in6_addr *addr;
2226 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2228 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2229 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2230 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2232 if (((void *)rt->dst.dev == dev || !dev) &&
2233 rt != net->ipv6.ip6_null_entry &&
2234 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2235 /* remove prefsrc entry */
2236 rt->rt6i_prefsrc.plen = 0;
2241 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2243 struct net *net = dev_net(ifp->idev->dev);
2244 struct arg_dev_net_ip adni = {
2245 .dev = ifp->idev->dev,
2249 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2252 struct arg_dev_net {
2253 struct net_device *dev;
2257 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2259 const struct arg_dev_net *adn = arg;
2260 const struct net_device *dev = adn->dev;
2262 if ((rt->dst.dev == dev || !dev) &&
2263 rt != adn->net->ipv6.ip6_null_entry)
2269 void rt6_ifdown(struct net *net, struct net_device *dev)
2271 struct arg_dev_net adn = {
2276 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2277 icmp6_clean_all(fib6_ifdown, &adn);
2280 struct rt6_mtu_change_arg {
2281 struct net_device *dev;
2285 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2287 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2288 struct inet6_dev *idev;
2290 /* In IPv6 pmtu discovery is not optional,
2291 so that RTAX_MTU lock cannot disable it.
2292 We still use this lock to block changes
2293 caused by addrconf/ndisc.
2296 idev = __in6_dev_get(arg->dev);
2300 /* For administrative MTU increase, there is no way to discover
2301 IPv6 PMTU increase, so PMTU increase should be updated here.
2302 Since RFC 1981 doesn't include administrative MTU increase
2303 update PMTU increase is a MUST. (i.e. jumbo frame)
2306 If new MTU is less than route PMTU, this new MTU will be the
2307 lowest MTU in the path, update the route PMTU to reflect PMTU
2308 decreases; if new MTU is greater than route PMTU, and the
2309 old MTU is the lowest MTU in the path, update the route PMTU
2310 to reflect the increase. In this case if the other nodes' MTU
2311 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2314 if (rt->dst.dev == arg->dev &&
2315 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2316 (dst_mtu(&rt->dst) >= arg->mtu ||
2317 (dst_mtu(&rt->dst) < arg->mtu &&
2318 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2319 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2324 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2326 struct rt6_mtu_change_arg arg = {
2331 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2334 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2335 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2336 [RTA_OIF] = { .type = NLA_U32 },
2337 [RTA_IIF] = { .type = NLA_U32 },
2338 [RTA_PRIORITY] = { .type = NLA_U32 },
2339 [RTA_METRICS] = { .type = NLA_NESTED },
2340 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2343 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2344 struct fib6_config *cfg)
2347 struct nlattr *tb[RTA_MAX+1];
2350 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2355 rtm = nlmsg_data(nlh);
2356 memset(cfg, 0, sizeof(*cfg));
2358 cfg->fc_table = rtm->rtm_table;
2359 cfg->fc_dst_len = rtm->rtm_dst_len;
2360 cfg->fc_src_len = rtm->rtm_src_len;
2361 cfg->fc_flags = RTF_UP;
2362 cfg->fc_protocol = rtm->rtm_protocol;
2363 cfg->fc_type = rtm->rtm_type;
2365 if (rtm->rtm_type == RTN_UNREACHABLE ||
2366 rtm->rtm_type == RTN_BLACKHOLE ||
2367 rtm->rtm_type == RTN_PROHIBIT ||
2368 rtm->rtm_type == RTN_THROW)
2369 cfg->fc_flags |= RTF_REJECT;
2371 if (rtm->rtm_type == RTN_LOCAL)
2372 cfg->fc_flags |= RTF_LOCAL;
2374 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2375 cfg->fc_nlinfo.nlh = nlh;
2376 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2378 if (tb[RTA_GATEWAY]) {
2379 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2380 cfg->fc_flags |= RTF_GATEWAY;
2384 int plen = (rtm->rtm_dst_len + 7) >> 3;
2386 if (nla_len(tb[RTA_DST]) < plen)
2389 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2393 int plen = (rtm->rtm_src_len + 7) >> 3;
2395 if (nla_len(tb[RTA_SRC]) < plen)
2398 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2401 if (tb[RTA_PREFSRC])
2402 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2405 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2407 if (tb[RTA_PRIORITY])
2408 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2410 if (tb[RTA_METRICS]) {
2411 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2412 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2416 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2418 if (tb[RTA_MULTIPATH]) {
2419 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2420 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2428 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2430 struct fib6_config r_cfg;
2431 struct rtnexthop *rtnh;
2434 int err = 0, last_err = 0;
2437 rtnh = (struct rtnexthop *)cfg->fc_mp;
2438 remaining = cfg->fc_mp_len;
2440 /* Parse a Multipath Entry */
2441 while (rtnh_ok(rtnh, remaining)) {
2442 memcpy(&r_cfg, cfg, sizeof(*cfg));
2443 if (rtnh->rtnh_ifindex)
2444 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2446 attrlen = rtnh_attrlen(rtnh);
2448 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2450 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2452 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2453 r_cfg.fc_flags |= RTF_GATEWAY;
2456 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2459 /* If we are trying to remove a route, do not stop the
2460 * loop when ip6_route_del() fails (because next hop is
2461 * already gone), we should try to remove all next hops.
2464 /* If add fails, we should try to delete all
2465 * next hops that have been already added.
2471 /* Because each route is added like a single route we remove
2472 * this flag after the first nexthop (if there is a collision,
2473 * we have already fail to add the first nexthop:
2474 * fib6_add_rt2node() has reject it).
2476 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2477 rtnh = rtnh_next(rtnh, &remaining);
2483 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2485 struct fib6_config cfg;
2488 err = rtm_to_fib6_config(skb, nlh, &cfg);
2493 return ip6_route_multipath(&cfg, 0);
2495 return ip6_route_del(&cfg);
2498 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2500 struct fib6_config cfg;
2503 err = rtm_to_fib6_config(skb, nlh, &cfg);
2508 return ip6_route_multipath(&cfg, 1);
2510 return ip6_route_add(&cfg);
2513 static inline size_t rt6_nlmsg_size(void)
2515 return NLMSG_ALIGN(sizeof(struct rtmsg))
2516 + nla_total_size(16) /* RTA_SRC */
2517 + nla_total_size(16) /* RTA_DST */
2518 + nla_total_size(16) /* RTA_GATEWAY */
2519 + nla_total_size(16) /* RTA_PREFSRC */
2520 + nla_total_size(4) /* RTA_TABLE */
2521 + nla_total_size(4) /* RTA_IIF */
2522 + nla_total_size(4) /* RTA_OIF */
2523 + nla_total_size(4) /* RTA_PRIORITY */
2524 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2525 + nla_total_size(sizeof(struct rta_cacheinfo));
2528 static int rt6_fill_node(struct net *net,
2529 struct sk_buff *skb, struct rt6_info *rt,
2530 struct in6_addr *dst, struct in6_addr *src,
2531 int iif, int type, u32 portid, u32 seq,
2532 int prefix, int nowait, unsigned int flags)
2535 struct nlmsghdr *nlh;
2539 if (prefix) { /* user wants prefix routes only */
2540 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2541 /* success since this is not a prefix route */
2546 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2550 rtm = nlmsg_data(nlh);
2551 rtm->rtm_family = AF_INET6;
2552 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2553 rtm->rtm_src_len = rt->rt6i_src.plen;
2556 table = rt->rt6i_table->tb6_id;
2558 table = RT6_TABLE_UNSPEC;
2559 rtm->rtm_table = table;
2560 if (nla_put_u32(skb, RTA_TABLE, table))
2561 goto nla_put_failure;
2562 if (rt->rt6i_flags & RTF_REJECT) {
2563 switch (rt->dst.error) {
2565 rtm->rtm_type = RTN_BLACKHOLE;
2568 rtm->rtm_type = RTN_PROHIBIT;
2571 rtm->rtm_type = RTN_THROW;
2574 rtm->rtm_type = RTN_UNREACHABLE;
2578 else if (rt->rt6i_flags & RTF_LOCAL)
2579 rtm->rtm_type = RTN_LOCAL;
2580 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2581 rtm->rtm_type = RTN_LOCAL;
2583 rtm->rtm_type = RTN_UNICAST;
2585 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2586 rtm->rtm_protocol = rt->rt6i_protocol;
2587 if (rt->rt6i_flags & RTF_DYNAMIC)
2588 rtm->rtm_protocol = RTPROT_REDIRECT;
2589 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2590 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2591 rtm->rtm_protocol = RTPROT_RA;
2593 rtm->rtm_protocol = RTPROT_KERNEL;
2596 if (rt->rt6i_flags & RTF_CACHE)
2597 rtm->rtm_flags |= RTM_F_CLONED;
2600 if (nla_put(skb, RTA_DST, 16, dst))
2601 goto nla_put_failure;
2602 rtm->rtm_dst_len = 128;
2603 } else if (rtm->rtm_dst_len)
2604 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2605 goto nla_put_failure;
2606 #ifdef CONFIG_IPV6_SUBTREES
2608 if (nla_put(skb, RTA_SRC, 16, src))
2609 goto nla_put_failure;
2610 rtm->rtm_src_len = 128;
2611 } else if (rtm->rtm_src_len &&
2612 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2613 goto nla_put_failure;
2616 #ifdef CONFIG_IPV6_MROUTE
2617 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2618 int err = ip6mr_get_route(net, skb, rtm, nowait);
2623 goto nla_put_failure;
2625 if (err == -EMSGSIZE)
2626 goto nla_put_failure;
2631 if (nla_put_u32(skb, RTA_IIF, iif))
2632 goto nla_put_failure;
2634 struct in6_addr saddr_buf;
2635 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2636 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2637 goto nla_put_failure;
2640 if (rt->rt6i_prefsrc.plen) {
2641 struct in6_addr saddr_buf;
2642 saddr_buf = rt->rt6i_prefsrc.addr;
2643 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2644 goto nla_put_failure;
2647 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2648 goto nla_put_failure;
2650 if (rt->rt6i_flags & RTF_GATEWAY) {
2651 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2652 goto nla_put_failure;
2656 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2657 goto nla_put_failure;
2658 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2659 goto nla_put_failure;
2661 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2663 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2664 goto nla_put_failure;
2666 return nlmsg_end(skb, nlh);
2669 nlmsg_cancel(skb, nlh);
2673 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2675 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2678 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2679 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2680 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2684 return rt6_fill_node(arg->net,
2685 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2686 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2687 prefix, 0, NLM_F_MULTI);
2690 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2692 struct net *net = sock_net(in_skb->sk);
2693 struct nlattr *tb[RTA_MAX+1];
2694 struct rt6_info *rt;
2695 struct sk_buff *skb;
2698 int err, iif = 0, oif = 0;
2700 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2705 memset(&fl6, 0, sizeof(fl6));
2708 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2711 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2715 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2718 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2722 iif = nla_get_u32(tb[RTA_IIF]);
2725 oif = nla_get_u32(tb[RTA_OIF]);
2728 struct net_device *dev;
2731 dev = __dev_get_by_index(net, iif);
2737 fl6.flowi6_iif = iif;
2739 if (!ipv6_addr_any(&fl6.saddr))
2740 flags |= RT6_LOOKUP_F_HAS_SADDR;
2742 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2745 fl6.flowi6_oif = oif;
2747 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2750 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2757 /* Reserve room for dummy headers, this skb can pass
2758 through good chunk of routing engine.
2760 skb_reset_mac_header(skb);
2761 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2763 skb_dst_set(skb, &rt->dst);
2765 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2766 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2767 nlh->nlmsg_seq, 0, 0, 0);
2773 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2778 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2780 struct sk_buff *skb;
2781 struct net *net = info->nl_net;
2786 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2788 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2792 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2793 event, info->portid, seq, 0, 0, 0);
2795 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2796 WARN_ON(err == -EMSGSIZE);
2800 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2801 info->nlh, gfp_any());
2805 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2808 static int ip6_route_dev_notify(struct notifier_block *this,
2809 unsigned long event, void *ptr)
2811 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2812 struct net *net = dev_net(dev);
2814 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2815 net->ipv6.ip6_null_entry->dst.dev = dev;
2816 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2817 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2818 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2819 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2820 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2821 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2832 #ifdef CONFIG_PROC_FS
2834 static const struct file_operations ipv6_route_proc_fops = {
2835 .owner = THIS_MODULE,
2836 .open = ipv6_route_open,
2838 .llseek = seq_lseek,
2839 .release = seq_release_net,
2842 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2844 struct net *net = (struct net *)seq->private;
2845 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2846 net->ipv6.rt6_stats->fib_nodes,
2847 net->ipv6.rt6_stats->fib_route_nodes,
2848 net->ipv6.rt6_stats->fib_rt_alloc,
2849 net->ipv6.rt6_stats->fib_rt_entries,
2850 net->ipv6.rt6_stats->fib_rt_cache,
2851 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2852 net->ipv6.rt6_stats->fib_discarded_routes);
2857 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2859 return single_open_net(inode, file, rt6_stats_seq_show);
2862 static const struct file_operations rt6_stats_seq_fops = {
2863 .owner = THIS_MODULE,
2864 .open = rt6_stats_seq_open,
2866 .llseek = seq_lseek,
2867 .release = single_release_net,
2869 #endif /* CONFIG_PROC_FS */
2871 #ifdef CONFIG_SYSCTL
2874 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2875 void __user *buffer, size_t *lenp, loff_t *ppos)
2882 net = (struct net *)ctl->extra1;
2883 delay = net->ipv6.sysctl.flush_delay;
2884 proc_dointvec(ctl, write, buffer, lenp, ppos);
2885 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2889 struct ctl_table ipv6_route_table_template[] = {
2891 .procname = "flush",
2892 .data = &init_net.ipv6.sysctl.flush_delay,
2893 .maxlen = sizeof(int),
2895 .proc_handler = ipv6_sysctl_rtcache_flush
2898 .procname = "gc_thresh",
2899 .data = &ip6_dst_ops_template.gc_thresh,
2900 .maxlen = sizeof(int),
2902 .proc_handler = proc_dointvec,
2905 .procname = "max_size",
2906 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2907 .maxlen = sizeof(int),
2909 .proc_handler = proc_dointvec,
2912 .procname = "gc_min_interval",
2913 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2914 .maxlen = sizeof(int),
2916 .proc_handler = proc_dointvec_jiffies,
2919 .procname = "gc_timeout",
2920 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2921 .maxlen = sizeof(int),
2923 .proc_handler = proc_dointvec_jiffies,
2926 .procname = "gc_interval",
2927 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2928 .maxlen = sizeof(int),
2930 .proc_handler = proc_dointvec_jiffies,
2933 .procname = "gc_elasticity",
2934 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2935 .maxlen = sizeof(int),
2937 .proc_handler = proc_dointvec,
2940 .procname = "mtu_expires",
2941 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2942 .maxlen = sizeof(int),
2944 .proc_handler = proc_dointvec_jiffies,
2947 .procname = "min_adv_mss",
2948 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2949 .maxlen = sizeof(int),
2951 .proc_handler = proc_dointvec,
2954 .procname = "gc_min_interval_ms",
2955 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2956 .maxlen = sizeof(int),
2958 .proc_handler = proc_dointvec_ms_jiffies,
2963 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2965 struct ctl_table *table;
2967 table = kmemdup(ipv6_route_table_template,
2968 sizeof(ipv6_route_table_template),
2972 table[0].data = &net->ipv6.sysctl.flush_delay;
2973 table[0].extra1 = net;
2974 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2975 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2976 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2977 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2978 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2979 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2980 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2981 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2982 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2984 /* Don't export sysctls to unprivileged users */
2985 if (net->user_ns != &init_user_ns)
2986 table[0].procname = NULL;
2993 static int __net_init ip6_route_net_init(struct net *net)
2997 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2998 sizeof(net->ipv6.ip6_dst_ops));
3000 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
3001 goto out_ip6_dst_ops;
3003 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
3004 sizeof(*net->ipv6.ip6_null_entry),
3006 if (!net->ipv6.ip6_null_entry)
3007 goto out_ip6_dst_entries;
3008 net->ipv6.ip6_null_entry->dst.path =
3009 (struct dst_entry *)net->ipv6.ip6_null_entry;
3010 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3011 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
3012 ip6_template_metrics, true);
3014 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3015 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
3016 sizeof(*net->ipv6.ip6_prohibit_entry),
3018 if (!net->ipv6.ip6_prohibit_entry)
3019 goto out_ip6_null_entry;
3020 net->ipv6.ip6_prohibit_entry->dst.path =
3021 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3022 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3023 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3024 ip6_template_metrics, true);
3026 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3027 sizeof(*net->ipv6.ip6_blk_hole_entry),
3029 if (!net->ipv6.ip6_blk_hole_entry)
3030 goto out_ip6_prohibit_entry;
3031 net->ipv6.ip6_blk_hole_entry->dst.path =
3032 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3033 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3034 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3035 ip6_template_metrics, true);
3038 net->ipv6.sysctl.flush_delay = 0;
3039 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3040 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3041 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3042 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3043 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3044 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3045 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3047 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3053 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3054 out_ip6_prohibit_entry:
3055 kfree(net->ipv6.ip6_prohibit_entry);
3057 kfree(net->ipv6.ip6_null_entry);
3059 out_ip6_dst_entries:
3060 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3065 static void __net_exit ip6_route_net_exit(struct net *net)
3067 kfree(net->ipv6.ip6_null_entry);
3068 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3069 kfree(net->ipv6.ip6_prohibit_entry);
3070 kfree(net->ipv6.ip6_blk_hole_entry);
3072 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3075 static int __net_init ip6_route_net_init_late(struct net *net)
3077 #ifdef CONFIG_PROC_FS
3078 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3079 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3084 static void __net_exit ip6_route_net_exit_late(struct net *net)
3086 #ifdef CONFIG_PROC_FS
3087 remove_proc_entry("ipv6_route", net->proc_net);
3088 remove_proc_entry("rt6_stats", net->proc_net);
3092 static struct pernet_operations ip6_route_net_ops = {
3093 .init = ip6_route_net_init,
3094 .exit = ip6_route_net_exit,
3097 static int __net_init ipv6_inetpeer_init(struct net *net)
3099 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3103 inet_peer_base_init(bp);
3104 net->ipv6.peers = bp;
3108 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3110 struct inet_peer_base *bp = net->ipv6.peers;
3112 net->ipv6.peers = NULL;
3113 inetpeer_invalidate_tree(bp);
3117 static struct pernet_operations ipv6_inetpeer_ops = {
3118 .init = ipv6_inetpeer_init,
3119 .exit = ipv6_inetpeer_exit,
3122 static struct pernet_operations ip6_route_net_late_ops = {
3123 .init = ip6_route_net_init_late,
3124 .exit = ip6_route_net_exit_late,
3127 static struct notifier_block ip6_route_dev_notifier = {
3128 .notifier_call = ip6_route_dev_notify,
3132 int __init ip6_route_init(void)
3137 ip6_dst_ops_template.kmem_cachep =
3138 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3139 SLAB_HWCACHE_ALIGN, NULL);
3140 if (!ip6_dst_ops_template.kmem_cachep)
3143 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3145 goto out_kmem_cache;
3147 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3149 goto out_dst_entries;
3151 ret = register_pernet_subsys(&ip6_route_net_ops);
3153 goto out_register_inetpeer;
3155 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3157 /* Registering of the loopback is done before this portion of code,
3158 * the loopback reference in rt6_info will not be taken, do it
3159 * manually for init_net */
3160 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3161 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3162 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3163 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3164 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3165 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3166 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3170 goto out_register_subsys;
3176 ret = fib6_rules_init();
3180 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3182 goto fib6_rules_init;
3185 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3186 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3187 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3188 goto out_register_late_subsys;
3190 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3192 goto out_register_late_subsys;
3197 out_register_late_subsys:
3198 unregister_pernet_subsys(&ip6_route_net_late_ops);
3200 fib6_rules_cleanup();
3205 out_register_subsys:
3206 unregister_pernet_subsys(&ip6_route_net_ops);
3207 out_register_inetpeer:
3208 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3210 dst_entries_destroy(&ip6_dst_blackhole_ops);
3212 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3216 void ip6_route_cleanup(void)
3218 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3219 unregister_pernet_subsys(&ip6_route_net_late_ops);
3220 fib6_rules_cleanup();
3223 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3224 unregister_pernet_subsys(&ip6_route_net_ops);
3225 dst_entries_destroy(&ip6_dst_blackhole_ops);
3226 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);