2 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
24 * Fixed routing subtrees.
27 #define pr_fmt(fmt) "IPv6: " fmt
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
55 #include <linux/rtnetlink.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
62 #include <asm/uaccess.h>
65 #include <linux/sysctl.h>
69 RT6_NUD_FAIL_HARD = -3,
70 RT6_NUD_FAIL_PROBE = -2,
71 RT6_NUD_FAIL_DO_RR = -1,
75 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
76 const struct in6_addr *dest);
77 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
78 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
79 static unsigned int ip6_mtu(const struct dst_entry *dst);
80 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
81 static void ip6_dst_destroy(struct dst_entry *);
82 static void ip6_dst_ifdown(struct dst_entry *,
83 struct net_device *dev, int how);
84 static int ip6_dst_gc(struct dst_ops *ops);
86 static int ip6_pkt_discard(struct sk_buff *skb);
87 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
88 static int ip6_pkt_prohibit(struct sk_buff *skb);
89 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
90 static void ip6_link_failure(struct sk_buff *skb);
91 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
92 struct sk_buff *skb, u32 mtu);
93 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
95 static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
97 #ifdef CONFIG_IPV6_ROUTE_INFO
98 static struct rt6_info *rt6_add_route_info(struct net *net,
99 const struct in6_addr *prefix, int prefixlen,
100 const struct in6_addr *gwaddr, int ifindex,
102 static struct rt6_info *rt6_get_route_info(struct net *net,
103 const struct in6_addr *prefix, int prefixlen,
104 const struct in6_addr *gwaddr, int ifindex);
107 static void rt6_bind_peer(struct rt6_info *rt, int create)
109 struct inet_peer_base *base;
110 struct inet_peer *peer;
112 base = inetpeer_base_ptr(rt->_rt6i_peer);
116 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
118 if (!rt6_set_peer(rt, peer))
123 static struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
125 if (rt6_has_peer(rt))
126 return rt6_peer_ptr(rt);
128 rt6_bind_peer(rt, create);
129 return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
132 static struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
134 return __rt6_get_peer(rt, 1);
137 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
139 struct rt6_info *rt = (struct rt6_info *) dst;
140 struct inet_peer *peer;
143 if (!(rt->dst.flags & DST_HOST))
146 peer = rt6_get_peer_create(rt);
148 u32 *old_p = __DST_METRICS_PTR(old);
149 unsigned long prev, new;
152 if (inet_metrics_new(peer) ||
153 (old & DST_METRICS_FORCE_OVERWRITE))
154 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
156 new = (unsigned long) p;
157 prev = cmpxchg(&dst->_metrics, old, new);
160 p = __DST_METRICS_PTR(prev);
161 if (prev & DST_METRICS_READ_ONLY)
168 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
172 struct in6_addr *p = &rt->rt6i_gateway;
174 if (!ipv6_addr_any(p))
175 return (const void *) p;
177 return &ipv6_hdr(skb)->daddr;
181 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
185 struct rt6_info *rt = (struct rt6_info *) dst;
188 daddr = choose_neigh_daddr(rt, skb, daddr);
189 n = __ipv6_neigh_lookup(dst->dev, daddr);
192 return neigh_create(&nd_tbl, daddr, dst->dev);
195 static struct dst_ops ip6_dst_ops_template = {
197 .protocol = cpu_to_be16(ETH_P_IPV6),
200 .check = ip6_dst_check,
201 .default_advmss = ip6_default_advmss,
203 .cow_metrics = ipv6_cow_metrics,
204 .destroy = ip6_dst_destroy,
205 .ifdown = ip6_dst_ifdown,
206 .negative_advice = ip6_negative_advice,
207 .link_failure = ip6_link_failure,
208 .update_pmtu = ip6_rt_update_pmtu,
209 .redirect = rt6_do_redirect,
210 .local_out = __ip6_local_out,
211 .neigh_lookup = ip6_neigh_lookup,
214 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
216 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
218 return mtu ? : dst->dev->mtu;
221 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
222 struct sk_buff *skb, u32 mtu)
226 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
231 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
237 static struct dst_ops ip6_dst_blackhole_ops = {
239 .protocol = cpu_to_be16(ETH_P_IPV6),
240 .destroy = ip6_dst_destroy,
241 .check = ip6_dst_check,
242 .mtu = ip6_blackhole_mtu,
243 .default_advmss = ip6_default_advmss,
244 .update_pmtu = ip6_rt_blackhole_update_pmtu,
245 .redirect = ip6_rt_blackhole_redirect,
246 .cow_metrics = ip6_rt_blackhole_cow_metrics,
247 .neigh_lookup = ip6_neigh_lookup,
250 static const u32 ip6_template_metrics[RTAX_MAX] = {
251 [RTAX_HOPLIMIT - 1] = 0,
254 static const struct rt6_info ip6_null_entry_template = {
256 .__refcnt = ATOMIC_INIT(1),
258 .obsolete = DST_OBSOLETE_FORCE_CHK,
259 .error = -ENETUNREACH,
260 .input = ip6_pkt_discard,
261 .output = ip6_pkt_discard_out,
263 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
264 .rt6i_protocol = RTPROT_KERNEL,
265 .rt6i_metric = ~(u32) 0,
266 .rt6i_ref = ATOMIC_INIT(1),
269 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
271 static const struct rt6_info ip6_prohibit_entry_template = {
273 .__refcnt = ATOMIC_INIT(1),
275 .obsolete = DST_OBSOLETE_FORCE_CHK,
277 .input = ip6_pkt_prohibit,
278 .output = ip6_pkt_prohibit_out,
280 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
281 .rt6i_protocol = RTPROT_KERNEL,
282 .rt6i_metric = ~(u32) 0,
283 .rt6i_ref = ATOMIC_INIT(1),
286 static const struct rt6_info ip6_blk_hole_entry_template = {
288 .__refcnt = ATOMIC_INIT(1),
290 .obsolete = DST_OBSOLETE_FORCE_CHK,
292 .input = dst_discard,
293 .output = dst_discard_sk,
295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
296 .rt6i_protocol = RTPROT_KERNEL,
297 .rt6i_metric = ~(u32) 0,
298 .rt6i_ref = ATOMIC_INIT(1),
303 /* allocate dst with ip6_dst_ops */
304 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
305 struct net_device *dev,
307 struct fib6_table *table)
309 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
310 0, DST_OBSOLETE_FORCE_CHK, flags);
313 struct dst_entry *dst = &rt->dst;
315 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
316 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
317 rt->rt6i_genid = rt_genid_ipv6(net);
318 INIT_LIST_HEAD(&rt->rt6i_siblings);
323 static void ip6_dst_destroy(struct dst_entry *dst)
325 struct rt6_info *rt = (struct rt6_info *)dst;
326 struct inet6_dev *idev = rt->rt6i_idev;
327 struct dst_entry *from = dst->from;
329 if (!(rt->dst.flags & DST_HOST))
330 dst_destroy_metrics_generic(dst);
333 rt->rt6i_idev = NULL;
340 if (rt6_has_peer(rt)) {
341 struct inet_peer *peer = rt6_peer_ptr(rt);
346 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
349 struct rt6_info *rt = (struct rt6_info *)dst;
350 struct inet6_dev *idev = rt->rt6i_idev;
351 struct net_device *loopback_dev =
352 dev_net(dev)->loopback_dev;
354 if (dev != loopback_dev) {
355 if (idev && idev->dev == dev) {
356 struct inet6_dev *loopback_idev =
357 in6_dev_get(loopback_dev);
359 rt->rt6i_idev = loopback_idev;
366 static bool rt6_check_expired(const struct rt6_info *rt)
368 if (rt->rt6i_flags & RTF_EXPIRES) {
369 if (time_after(jiffies, rt->dst.expires))
371 } else if (rt->dst.from) {
372 return rt6_check_expired((struct rt6_info *) rt->dst.from);
377 /* Multipath route selection:
378 * Hash based function using packet header and flowlabel.
379 * Adapted from fib_info_hashfn()
381 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
382 const struct flowi6 *fl6)
384 unsigned int val = fl6->flowi6_proto;
386 val ^= ipv6_addr_hash(&fl6->daddr);
387 val ^= ipv6_addr_hash(&fl6->saddr);
389 /* Work only if this not encapsulated */
390 switch (fl6->flowi6_proto) {
394 val ^= (__force u16)fl6->fl6_sport;
395 val ^= (__force u16)fl6->fl6_dport;
399 val ^= (__force u16)fl6->fl6_icmp_type;
400 val ^= (__force u16)fl6->fl6_icmp_code;
403 /* RFC6438 recommands to use flowlabel */
404 val ^= (__force u32)fl6->flowlabel;
406 /* Perhaps, we need to tune, this function? */
407 val = val ^ (val >> 7) ^ (val >> 12);
408 return val % candidate_count;
411 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
412 struct flowi6 *fl6, int oif,
415 struct rt6_info *sibling, *next_sibling;
418 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
419 /* Don't change the route, if route_choosen == 0
420 * (siblings does not include ourself)
423 list_for_each_entry_safe(sibling, next_sibling,
424 &match->rt6i_siblings, rt6i_siblings) {
426 if (route_choosen == 0) {
427 if (rt6_score_route(sibling, oif, strict) < 0)
437 * Route lookup. Any table->tb6_lock is implied.
440 static inline struct rt6_info *rt6_device_match(struct net *net,
442 const struct in6_addr *saddr,
446 struct rt6_info *local = NULL;
447 struct rt6_info *sprt;
449 if (!oif && ipv6_addr_any(saddr))
452 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
453 struct net_device *dev = sprt->dst.dev;
456 if (dev->ifindex == oif)
458 if (dev->flags & IFF_LOOPBACK) {
459 if (!sprt->rt6i_idev ||
460 sprt->rt6i_idev->dev->ifindex != oif) {
461 if (flags & RT6_LOOKUP_F_IFACE && oif)
463 if (local && (!oif ||
464 local->rt6i_idev->dev->ifindex == oif))
470 if (ipv6_chk_addr(net, saddr, dev,
471 flags & RT6_LOOKUP_F_IFACE))
480 if (flags & RT6_LOOKUP_F_IFACE)
481 return net->ipv6.ip6_null_entry;
487 #ifdef CONFIG_IPV6_ROUTER_PREF
488 struct __rt6_probe_work {
489 struct work_struct work;
490 struct in6_addr target;
491 struct net_device *dev;
494 static void rt6_probe_deferred(struct work_struct *w)
496 struct in6_addr mcaddr;
497 struct __rt6_probe_work *work =
498 container_of(w, struct __rt6_probe_work, work);
500 addrconf_addr_solict_mult(&work->target, &mcaddr);
501 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
506 static void rt6_probe(struct rt6_info *rt)
508 struct neighbour *neigh;
510 * Okay, this does not seem to be appropriate
511 * for now, however, we need to check if it
512 * is really so; aka Router Reachability Probing.
514 * Router Reachability Probe MUST be rate-limited
515 * to no more than one per minute.
517 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
520 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
522 write_lock(&neigh->lock);
523 if (neigh->nud_state & NUD_VALID)
528 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
529 struct __rt6_probe_work *work;
531 work = kmalloc(sizeof(*work), GFP_ATOMIC);
534 __neigh_set_probe_once(neigh);
537 write_unlock(&neigh->lock);
540 INIT_WORK(&work->work, rt6_probe_deferred);
541 work->target = rt->rt6i_gateway;
542 dev_hold(rt->dst.dev);
543 work->dev = rt->dst.dev;
544 schedule_work(&work->work);
548 write_unlock(&neigh->lock);
550 rcu_read_unlock_bh();
553 static inline void rt6_probe(struct rt6_info *rt)
559 * Default Router Selection (RFC 2461 6.3.6)
561 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
563 struct net_device *dev = rt->dst.dev;
564 if (!oif || dev->ifindex == oif)
566 if ((dev->flags & IFF_LOOPBACK) &&
567 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
572 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
574 struct neighbour *neigh;
575 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
577 if (rt->rt6i_flags & RTF_NONEXTHOP ||
578 !(rt->rt6i_flags & RTF_GATEWAY))
579 return RT6_NUD_SUCCEED;
582 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
584 read_lock(&neigh->lock);
585 if (neigh->nud_state & NUD_VALID)
586 ret = RT6_NUD_SUCCEED;
587 #ifdef CONFIG_IPV6_ROUTER_PREF
588 else if (!(neigh->nud_state & NUD_FAILED))
589 ret = RT6_NUD_SUCCEED;
591 ret = RT6_NUD_FAIL_PROBE;
593 read_unlock(&neigh->lock);
595 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
596 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
598 rcu_read_unlock_bh();
603 static int rt6_score_route(struct rt6_info *rt, int oif,
608 m = rt6_check_dev(rt, oif);
609 if (!m && (strict & RT6_LOOKUP_F_IFACE))
610 return RT6_NUD_FAIL_HARD;
611 #ifdef CONFIG_IPV6_ROUTER_PREF
612 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
614 if (strict & RT6_LOOKUP_F_REACHABLE) {
615 int n = rt6_check_neigh(rt);
622 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
623 int *mpri, struct rt6_info *match,
627 bool match_do_rr = false;
629 if (rt6_check_expired(rt))
632 m = rt6_score_route(rt, oif, strict);
633 if (m == RT6_NUD_FAIL_DO_RR) {
635 m = 0; /* lowest valid score */
636 } else if (m == RT6_NUD_FAIL_HARD) {
640 if (strict & RT6_LOOKUP_F_REACHABLE)
643 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
645 *do_rr = match_do_rr;
653 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
654 struct rt6_info *rr_head,
655 u32 metric, int oif, int strict,
658 struct rt6_info *rt, *match;
662 for (rt = rr_head; rt && rt->rt6i_metric == metric;
663 rt = rt->dst.rt6_next)
664 match = find_match(rt, oif, strict, &mpri, match, do_rr);
665 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
666 rt = rt->dst.rt6_next)
667 match = find_match(rt, oif, strict, &mpri, match, do_rr);
672 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
674 struct rt6_info *match, *rt0;
680 fn->rr_ptr = rt0 = fn->leaf;
682 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
686 struct rt6_info *next = rt0->dst.rt6_next;
688 /* no entries matched; do round-robin */
689 if (!next || next->rt6i_metric != rt0->rt6i_metric)
696 net = dev_net(rt0->dst.dev);
697 return match ? match : net->ipv6.ip6_null_entry;
700 #ifdef CONFIG_IPV6_ROUTE_INFO
701 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
702 const struct in6_addr *gwaddr)
704 struct net *net = dev_net(dev);
705 struct route_info *rinfo = (struct route_info *) opt;
706 struct in6_addr prefix_buf, *prefix;
708 unsigned long lifetime;
711 if (len < sizeof(struct route_info)) {
715 /* Sanity check for prefix_len and length */
716 if (rinfo->length > 3) {
718 } else if (rinfo->prefix_len > 128) {
720 } else if (rinfo->prefix_len > 64) {
721 if (rinfo->length < 2) {
724 } else if (rinfo->prefix_len > 0) {
725 if (rinfo->length < 1) {
730 pref = rinfo->route_pref;
731 if (pref == ICMPV6_ROUTER_PREF_INVALID)
734 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
736 if (rinfo->length == 3)
737 prefix = (struct in6_addr *)rinfo->prefix;
739 /* this function is safe */
740 ipv6_addr_prefix(&prefix_buf,
741 (struct in6_addr *)rinfo->prefix,
743 prefix = &prefix_buf;
746 if (rinfo->prefix_len == 0)
747 rt = rt6_get_dflt_router(gwaddr, dev);
749 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
750 gwaddr, dev->ifindex);
752 if (rt && !lifetime) {
758 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
761 rt->rt6i_flags = RTF_ROUTEINFO |
762 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
765 if (!addrconf_finite_timeout(lifetime))
766 rt6_clean_expires(rt);
768 rt6_set_expires(rt, jiffies + HZ * lifetime);
776 #define BACKTRACK(__net, saddr) \
778 if (rt == __net->ipv6.ip6_null_entry) { \
779 struct fib6_node *pn; \
781 if (fn->fn_flags & RTN_TL_ROOT) \
784 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
785 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
788 if (fn->fn_flags & RTN_RTINFO) \
794 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
795 struct fib6_table *table,
796 struct flowi6 *fl6, int flags)
798 struct fib6_node *fn;
801 read_lock_bh(&table->tb6_lock);
802 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
805 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
806 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
807 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
808 BACKTRACK(net, &fl6->saddr);
810 dst_use(&rt->dst, jiffies);
811 read_unlock_bh(&table->tb6_lock);
816 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
819 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
821 EXPORT_SYMBOL_GPL(ip6_route_lookup);
823 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
824 const struct in6_addr *saddr, int oif, int strict)
826 struct flowi6 fl6 = {
830 struct dst_entry *dst;
831 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
834 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
835 flags |= RT6_LOOKUP_F_HAS_SADDR;
838 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
840 return (struct rt6_info *) dst;
847 EXPORT_SYMBOL(rt6_lookup);
849 /* ip6_ins_rt is called with FREE table->tb6_lock.
850 It takes new route entry, the addition fails by any reason the
851 route is freed. In any case, if caller does not hold it, it may
855 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
856 struct nlattr *mx, int mx_len)
859 struct fib6_table *table;
861 table = rt->rt6i_table;
862 write_lock_bh(&table->tb6_lock);
863 err = fib6_add(&table->tb6_root, rt, info, mx, mx_len);
864 write_unlock_bh(&table->tb6_lock);
869 int ip6_ins_rt(struct rt6_info *rt)
871 struct nl_info info = {
872 .nl_net = dev_net(rt->dst.dev),
874 return __ip6_ins_rt(rt, &info, NULL, 0);
877 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
878 const struct in6_addr *daddr,
879 const struct in6_addr *saddr)
887 rt = ip6_rt_copy(ort, daddr);
890 if (ort->rt6i_dst.plen != 128 &&
891 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
892 rt->rt6i_flags |= RTF_ANYCAST;
894 rt->rt6i_flags |= RTF_CACHE;
896 #ifdef CONFIG_IPV6_SUBTREES
897 if (rt->rt6i_src.plen && saddr) {
898 rt->rt6i_src.addr = *saddr;
899 rt->rt6i_src.plen = 128;
907 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
908 const struct in6_addr *daddr)
910 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
913 rt->rt6i_flags |= RTF_CACHE;
917 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
918 struct flowi6 *fl6, int flags)
920 struct fib6_node *fn;
921 struct rt6_info *rt, *nrt;
925 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
927 strict |= flags & RT6_LOOKUP_F_IFACE;
930 read_lock_bh(&table->tb6_lock);
933 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
936 rt = rt6_select(fn, oif, strict | reachable);
937 if (rt->rt6i_nsiblings)
938 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable);
939 BACKTRACK(net, &fl6->saddr);
940 if (rt == net->ipv6.ip6_null_entry ||
941 rt->rt6i_flags & RTF_CACHE)
945 read_unlock_bh(&table->tb6_lock);
947 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
948 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
949 else if (!(rt->dst.flags & DST_HOST))
950 nrt = rt6_alloc_clone(rt, &fl6->daddr);
955 rt = nrt ? : net->ipv6.ip6_null_entry;
959 err = ip6_ins_rt(nrt);
968 * Race condition! In the gap, when table->tb6_lock was
969 * released someone could insert this route. Relookup.
980 read_unlock_bh(&table->tb6_lock);
982 rt->dst.lastuse = jiffies;
988 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
989 struct flowi6 *fl6, int flags)
991 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
994 static struct dst_entry *ip6_route_input_lookup(struct net *net,
995 struct net_device *dev,
996 struct flowi6 *fl6, int flags)
998 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
999 flags |= RT6_LOOKUP_F_IFACE;
1001 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
1004 void ip6_route_input(struct sk_buff *skb)
1006 const struct ipv6hdr *iph = ipv6_hdr(skb);
1007 struct net *net = dev_net(skb->dev);
1008 int flags = RT6_LOOKUP_F_HAS_SADDR;
1009 struct flowi6 fl6 = {
1010 .flowi6_iif = skb->dev->ifindex,
1011 .daddr = iph->daddr,
1012 .saddr = iph->saddr,
1013 .flowlabel = ip6_flowinfo(iph),
1014 .flowi6_mark = skb->mark,
1015 .flowi6_proto = iph->nexthdr,
1018 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1021 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1022 struct flowi6 *fl6, int flags)
1024 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1027 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1032 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1034 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1035 flags |= RT6_LOOKUP_F_IFACE;
1037 if (!ipv6_addr_any(&fl6->saddr))
1038 flags |= RT6_LOOKUP_F_HAS_SADDR;
1040 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1042 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1045 EXPORT_SYMBOL(ip6_route_output);
1047 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1049 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1050 struct dst_entry *new = NULL;
1052 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1056 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1057 rt6_init_peer(rt, net->ipv6.peers);
1060 new->input = dst_discard;
1061 new->output = dst_discard_sk;
1063 if (dst_metrics_read_only(&ort->dst))
1064 new->_metrics = ort->dst._metrics;
1066 dst_copy_metrics(new, &ort->dst);
1067 rt->rt6i_idev = ort->rt6i_idev;
1069 in6_dev_hold(rt->rt6i_idev);
1071 rt->rt6i_gateway = ort->rt6i_gateway;
1072 rt->rt6i_flags = ort->rt6i_flags;
1073 rt->rt6i_metric = 0;
1075 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1076 #ifdef CONFIG_IPV6_SUBTREES
1077 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1083 dst_release(dst_orig);
1084 return new ? new : ERR_PTR(-ENOMEM);
1088 * Destination cache support functions
1091 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1093 struct rt6_info *rt;
1095 rt = (struct rt6_info *) dst;
1097 /* All IPV6 dsts are created with ->obsolete set to the value
1098 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1099 * into this function always.
1101 if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
1104 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1107 if (rt6_check_expired(rt))
1113 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1115 struct rt6_info *rt = (struct rt6_info *) dst;
1118 if (rt->rt6i_flags & RTF_CACHE) {
1119 if (rt6_check_expired(rt)) {
1131 static void ip6_link_failure(struct sk_buff *skb)
1133 struct rt6_info *rt;
1135 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1137 rt = (struct rt6_info *) skb_dst(skb);
1139 if (rt->rt6i_flags & RTF_CACHE) {
1143 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1144 rt->rt6i_node->fn_sernum = -1;
1149 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1150 struct sk_buff *skb, u32 mtu)
1152 struct rt6_info *rt6 = (struct rt6_info*)dst;
1155 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1156 struct net *net = dev_net(dst->dev);
1158 rt6->rt6i_flags |= RTF_MODIFIED;
1159 if (mtu < IPV6_MIN_MTU) {
1160 u32 features = dst_metric(dst, RTAX_FEATURES);
1162 features |= RTAX_FEATURE_ALLFRAG;
1163 dst_metric_set(dst, RTAX_FEATURES, features);
1165 dst_metric_set(dst, RTAX_MTU, mtu);
1166 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1170 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1173 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1174 struct dst_entry *dst;
1177 memset(&fl6, 0, sizeof(fl6));
1178 fl6.flowi6_oif = oif;
1179 fl6.flowi6_mark = mark;
1180 fl6.daddr = iph->daddr;
1181 fl6.saddr = iph->saddr;
1182 fl6.flowlabel = ip6_flowinfo(iph);
1184 dst = ip6_route_output(net, NULL, &fl6);
1186 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1189 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1191 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1193 ip6_update_pmtu(skb, sock_net(sk), mtu,
1194 sk->sk_bound_dev_if, sk->sk_mark);
1196 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1198 /* Handle redirects */
1199 struct ip6rd_flowi {
1201 struct in6_addr gateway;
1204 static struct rt6_info *__ip6_route_redirect(struct net *net,
1205 struct fib6_table *table,
1209 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
1210 struct rt6_info *rt;
1211 struct fib6_node *fn;
1213 /* Get the "current" route for this destination and
1214 * check if the redirect has come from approriate router.
1216 * RFC 4861 specifies that redirects should only be
1217 * accepted if they come from the nexthop to the target.
1218 * Due to the way the routes are chosen, this notion
1219 * is a bit fuzzy and one might need to check all possible
1223 read_lock_bh(&table->tb6_lock);
1224 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
1226 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1227 if (rt6_check_expired(rt))
1231 if (!(rt->rt6i_flags & RTF_GATEWAY))
1233 if (fl6->flowi6_oif != rt->dst.dev->ifindex)
1235 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1241 rt = net->ipv6.ip6_null_entry;
1242 else if (rt->dst.error) {
1243 rt = net->ipv6.ip6_null_entry;
1246 BACKTRACK(net, &fl6->saddr);
1250 read_unlock_bh(&table->tb6_lock);
1255 static struct dst_entry *ip6_route_redirect(struct net *net,
1256 const struct flowi6 *fl6,
1257 const struct in6_addr *gateway)
1259 int flags = RT6_LOOKUP_F_HAS_SADDR;
1260 struct ip6rd_flowi rdfl;
1263 rdfl.gateway = *gateway;
1265 return fib6_rule_lookup(net, &rdfl.fl6,
1266 flags, __ip6_route_redirect);
1269 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1271 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1272 struct dst_entry *dst;
1275 memset(&fl6, 0, sizeof(fl6));
1276 fl6.flowi6_oif = oif;
1277 fl6.flowi6_mark = mark;
1278 fl6.daddr = iph->daddr;
1279 fl6.saddr = iph->saddr;
1280 fl6.flowlabel = ip6_flowinfo(iph);
1282 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
1283 rt6_do_redirect(dst, NULL, skb);
1286 EXPORT_SYMBOL_GPL(ip6_redirect);
1288 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
1291 const struct ipv6hdr *iph = ipv6_hdr(skb);
1292 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
1293 struct dst_entry *dst;
1296 memset(&fl6, 0, sizeof(fl6));
1297 fl6.flowi6_oif = oif;
1298 fl6.flowi6_mark = mark;
1299 fl6.daddr = msg->dest;
1300 fl6.saddr = iph->daddr;
1302 dst = ip6_route_redirect(net, &fl6, &iph->saddr);
1303 rt6_do_redirect(dst, NULL, skb);
1307 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1309 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1311 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1313 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1315 struct net_device *dev = dst->dev;
1316 unsigned int mtu = dst_mtu(dst);
1317 struct net *net = dev_net(dev);
1319 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1321 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1322 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1325 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1326 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1327 * IPV6_MAXPLEN is also valid and means: "any MSS,
1328 * rely only on pmtu discovery"
1330 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1335 static unsigned int ip6_mtu(const struct dst_entry *dst)
1337 struct inet6_dev *idev;
1338 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1346 idev = __in6_dev_get(dst->dev);
1348 mtu = idev->cnf.mtu6;
1352 return min_t(unsigned int, mtu, IP6_MAX_MTU);
1355 static struct dst_entry *icmp6_dst_gc_list;
1356 static DEFINE_SPINLOCK(icmp6_dst_lock);
1358 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1361 struct dst_entry *dst;
1362 struct rt6_info *rt;
1363 struct inet6_dev *idev = in6_dev_get(dev);
1364 struct net *net = dev_net(dev);
1366 if (unlikely(!idev))
1367 return ERR_PTR(-ENODEV);
1369 rt = ip6_dst_alloc(net, dev, 0, NULL);
1370 if (unlikely(!rt)) {
1372 dst = ERR_PTR(-ENOMEM);
1376 rt->dst.flags |= DST_HOST;
1377 rt->dst.output = ip6_output;
1378 atomic_set(&rt->dst.__refcnt, 1);
1379 rt->rt6i_gateway = fl6->daddr;
1380 rt->rt6i_dst.addr = fl6->daddr;
1381 rt->rt6i_dst.plen = 128;
1382 rt->rt6i_idev = idev;
1383 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1385 spin_lock_bh(&icmp6_dst_lock);
1386 rt->dst.next = icmp6_dst_gc_list;
1387 icmp6_dst_gc_list = &rt->dst;
1388 spin_unlock_bh(&icmp6_dst_lock);
1390 fib6_force_start_gc(net);
1392 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1398 int icmp6_dst_gc(void)
1400 struct dst_entry *dst, **pprev;
1403 spin_lock_bh(&icmp6_dst_lock);
1404 pprev = &icmp6_dst_gc_list;
1406 while ((dst = *pprev) != NULL) {
1407 if (!atomic_read(&dst->__refcnt)) {
1416 spin_unlock_bh(&icmp6_dst_lock);
1421 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1424 struct dst_entry *dst, **pprev;
1426 spin_lock_bh(&icmp6_dst_lock);
1427 pprev = &icmp6_dst_gc_list;
1428 while ((dst = *pprev) != NULL) {
1429 struct rt6_info *rt = (struct rt6_info *) dst;
1430 if (func(rt, arg)) {
1437 spin_unlock_bh(&icmp6_dst_lock);
1440 static int ip6_dst_gc(struct dst_ops *ops)
1442 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1443 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1444 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1445 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1446 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1447 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1450 entries = dst_entries_get_fast(ops);
1451 if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
1452 entries <= rt_max_size)
1455 net->ipv6.ip6_rt_gc_expire++;
1456 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size);
1457 entries = dst_entries_get_slow(ops);
1458 if (entries < ops->gc_thresh)
1459 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1461 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1462 return entries > rt_max_size;
1469 int ip6_route_add(struct fib6_config *cfg)
1472 struct net *net = cfg->fc_nlinfo.nl_net;
1473 struct rt6_info *rt = NULL;
1474 struct net_device *dev = NULL;
1475 struct inet6_dev *idev = NULL;
1476 struct fib6_table *table;
1479 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1481 #ifndef CONFIG_IPV6_SUBTREES
1482 if (cfg->fc_src_len)
1485 if (cfg->fc_ifindex) {
1487 dev = dev_get_by_index(net, cfg->fc_ifindex);
1490 idev = in6_dev_get(dev);
1495 if (cfg->fc_metric == 0)
1496 cfg->fc_metric = IP6_RT_PRIO_USER;
1499 if (cfg->fc_nlinfo.nlh &&
1500 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1501 table = fib6_get_table(net, cfg->fc_table);
1503 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1504 table = fib6_new_table(net, cfg->fc_table);
1507 table = fib6_new_table(net, cfg->fc_table);
1513 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1520 if (cfg->fc_flags & RTF_EXPIRES)
1521 rt6_set_expires(rt, jiffies +
1522 clock_t_to_jiffies(cfg->fc_expires));
1524 rt6_clean_expires(rt);
1526 if (cfg->fc_protocol == RTPROT_UNSPEC)
1527 cfg->fc_protocol = RTPROT_BOOT;
1528 rt->rt6i_protocol = cfg->fc_protocol;
1530 addr_type = ipv6_addr_type(&cfg->fc_dst);
1532 if (addr_type & IPV6_ADDR_MULTICAST)
1533 rt->dst.input = ip6_mc_input;
1534 else if (cfg->fc_flags & RTF_LOCAL)
1535 rt->dst.input = ip6_input;
1537 rt->dst.input = ip6_forward;
1539 rt->dst.output = ip6_output;
1541 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1542 rt->rt6i_dst.plen = cfg->fc_dst_len;
1543 if (rt->rt6i_dst.plen == 128) {
1544 rt->dst.flags |= DST_HOST;
1545 dst_metrics_set_force_overwrite(&rt->dst);
1548 #ifdef CONFIG_IPV6_SUBTREES
1549 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1550 rt->rt6i_src.plen = cfg->fc_src_len;
1553 rt->rt6i_metric = cfg->fc_metric;
1555 /* We cannot add true routes via loopback here,
1556 they would result in kernel looping; promote them to reject routes
1558 if ((cfg->fc_flags & RTF_REJECT) ||
1559 (dev && (dev->flags & IFF_LOOPBACK) &&
1560 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1561 !(cfg->fc_flags & RTF_LOCAL))) {
1562 /* hold loopback dev/idev if we haven't done so. */
1563 if (dev != net->loopback_dev) {
1568 dev = net->loopback_dev;
1570 idev = in6_dev_get(dev);
1576 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1577 switch (cfg->fc_type) {
1579 rt->dst.error = -EINVAL;
1580 rt->dst.output = dst_discard_sk;
1581 rt->dst.input = dst_discard;
1584 rt->dst.error = -EACCES;
1585 rt->dst.output = ip6_pkt_prohibit_out;
1586 rt->dst.input = ip6_pkt_prohibit;
1590 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1592 rt->dst.output = ip6_pkt_discard_out;
1593 rt->dst.input = ip6_pkt_discard;
1599 if (cfg->fc_flags & RTF_GATEWAY) {
1600 const struct in6_addr *gw_addr;
1603 gw_addr = &cfg->fc_gateway;
1604 rt->rt6i_gateway = *gw_addr;
1605 gwa_type = ipv6_addr_type(gw_addr);
1607 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1608 struct rt6_info *grt;
1610 /* IPv6 strictly inhibits using not link-local
1611 addresses as nexthop address.
1612 Otherwise, router will not able to send redirects.
1613 It is very good, but in some (rare!) circumstances
1614 (SIT, PtP, NBMA NOARP links) it is handy to allow
1615 some exceptions. --ANK
1618 if (!(gwa_type & IPV6_ADDR_UNICAST))
1621 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1623 err = -EHOSTUNREACH;
1627 if (dev != grt->dst.dev) {
1633 idev = grt->rt6i_idev;
1635 in6_dev_hold(grt->rt6i_idev);
1637 if (!(grt->rt6i_flags & RTF_GATEWAY))
1645 if (!dev || (dev->flags & IFF_LOOPBACK))
1653 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1654 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1658 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1659 rt->rt6i_prefsrc.plen = 128;
1661 rt->rt6i_prefsrc.plen = 0;
1663 rt->rt6i_flags = cfg->fc_flags;
1667 rt->rt6i_idev = idev;
1668 rt->rt6i_table = table;
1670 cfg->fc_nlinfo.nl_net = dev_net(dev);
1672 return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len);
1684 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1687 struct fib6_table *table;
1688 struct net *net = dev_net(rt->dst.dev);
1690 if (rt == net->ipv6.ip6_null_entry) {
1695 table = rt->rt6i_table;
1696 write_lock_bh(&table->tb6_lock);
1697 err = fib6_del(rt, info);
1698 write_unlock_bh(&table->tb6_lock);
1705 int ip6_del_rt(struct rt6_info *rt)
1707 struct nl_info info = {
1708 .nl_net = dev_net(rt->dst.dev),
1710 return __ip6_del_rt(rt, &info);
1713 static int ip6_route_del(struct fib6_config *cfg)
1715 struct fib6_table *table;
1716 struct fib6_node *fn;
1717 struct rt6_info *rt;
1720 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1724 read_lock_bh(&table->tb6_lock);
1726 fn = fib6_locate(&table->tb6_root,
1727 &cfg->fc_dst, cfg->fc_dst_len,
1728 &cfg->fc_src, cfg->fc_src_len);
1731 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1732 if (cfg->fc_ifindex &&
1734 rt->dst.dev->ifindex != cfg->fc_ifindex))
1736 if (cfg->fc_flags & RTF_GATEWAY &&
1737 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1739 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1742 read_unlock_bh(&table->tb6_lock);
1744 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1747 read_unlock_bh(&table->tb6_lock);
1752 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1754 struct net *net = dev_net(skb->dev);
1755 struct netevent_redirect netevent;
1756 struct rt6_info *rt, *nrt = NULL;
1757 struct ndisc_options ndopts;
1758 struct inet6_dev *in6_dev;
1759 struct neighbour *neigh;
1761 int optlen, on_link;
1764 optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1765 optlen -= sizeof(*msg);
1768 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1772 msg = (struct rd_msg *)icmp6_hdr(skb);
1774 if (ipv6_addr_is_multicast(&msg->dest)) {
1775 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1780 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1782 } else if (ipv6_addr_type(&msg->target) !=
1783 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1784 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1788 in6_dev = __in6_dev_get(skb->dev);
1791 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1795 * The IP source address of the Redirect MUST be the same as the current
1796 * first-hop router for the specified ICMP Destination Address.
1799 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1800 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1805 if (ndopts.nd_opts_tgt_lladdr) {
1806 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1809 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1814 rt = (struct rt6_info *) dst;
1815 if (rt == net->ipv6.ip6_null_entry) {
1816 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1820 /* Redirect received -> path was valid.
1821 * Look, redirects are sent only in response to data packets,
1822 * so that this nexthop apparently is reachable. --ANK
1824 dst_confirm(&rt->dst);
1826 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1831 * We have finally decided to accept it.
1834 neigh_update(neigh, lladdr, NUD_STALE,
1835 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1836 NEIGH_UPDATE_F_OVERRIDE|
1837 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1838 NEIGH_UPDATE_F_ISROUTER))
1841 nrt = ip6_rt_copy(rt, &msg->dest);
1845 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1847 nrt->rt6i_flags &= ~RTF_GATEWAY;
1849 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1851 if (ip6_ins_rt(nrt))
1854 netevent.old = &rt->dst;
1855 netevent.new = &nrt->dst;
1856 netevent.daddr = &msg->dest;
1857 netevent.neigh = neigh;
1858 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1860 if (rt->rt6i_flags & RTF_CACHE) {
1861 rt = (struct rt6_info *) dst_clone(&rt->dst);
1866 neigh_release(neigh);
1870 * Misc support functions
1873 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1874 const struct in6_addr *dest)
1876 struct net *net = dev_net(ort->dst.dev);
1877 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1881 rt->dst.input = ort->dst.input;
1882 rt->dst.output = ort->dst.output;
1883 rt->dst.flags |= DST_HOST;
1885 rt->rt6i_dst.addr = *dest;
1886 rt->rt6i_dst.plen = 128;
1887 dst_copy_metrics(&rt->dst, &ort->dst);
1888 rt->dst.error = ort->dst.error;
1889 rt->rt6i_idev = ort->rt6i_idev;
1891 in6_dev_hold(rt->rt6i_idev);
1892 rt->dst.lastuse = jiffies;
1894 if (ort->rt6i_flags & RTF_GATEWAY)
1895 rt->rt6i_gateway = ort->rt6i_gateway;
1897 rt->rt6i_gateway = *dest;
1898 rt->rt6i_flags = ort->rt6i_flags;
1899 rt6_set_from(rt, ort);
1900 rt->rt6i_metric = 0;
1902 #ifdef CONFIG_IPV6_SUBTREES
1903 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1905 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1906 rt->rt6i_table = ort->rt6i_table;
1911 #ifdef CONFIG_IPV6_ROUTE_INFO
1912 static struct rt6_info *rt6_get_route_info(struct net *net,
1913 const struct in6_addr *prefix, int prefixlen,
1914 const struct in6_addr *gwaddr, int ifindex)
1916 struct fib6_node *fn;
1917 struct rt6_info *rt = NULL;
1918 struct fib6_table *table;
1920 table = fib6_get_table(net, RT6_TABLE_INFO);
1924 read_lock_bh(&table->tb6_lock);
1925 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1929 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1930 if (rt->dst.dev->ifindex != ifindex)
1932 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1934 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1940 read_unlock_bh(&table->tb6_lock);
1944 static struct rt6_info *rt6_add_route_info(struct net *net,
1945 const struct in6_addr *prefix, int prefixlen,
1946 const struct in6_addr *gwaddr, int ifindex,
1949 struct fib6_config cfg = {
1950 .fc_table = RT6_TABLE_INFO,
1951 .fc_metric = IP6_RT_PRIO_USER,
1952 .fc_ifindex = ifindex,
1953 .fc_dst_len = prefixlen,
1954 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1955 RTF_UP | RTF_PREF(pref),
1956 .fc_nlinfo.portid = 0,
1957 .fc_nlinfo.nlh = NULL,
1958 .fc_nlinfo.nl_net = net,
1961 cfg.fc_dst = *prefix;
1962 cfg.fc_gateway = *gwaddr;
1964 /* We should treat it as a default route if prefix length is 0. */
1966 cfg.fc_flags |= RTF_DEFAULT;
1968 ip6_route_add(&cfg);
1970 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1974 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1976 struct rt6_info *rt;
1977 struct fib6_table *table;
1979 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1983 read_lock_bh(&table->tb6_lock);
1984 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1985 if (dev == rt->dst.dev &&
1986 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1987 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1992 read_unlock_bh(&table->tb6_lock);
1996 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1997 struct net_device *dev,
2000 struct fib6_config cfg = {
2001 .fc_table = RT6_TABLE_DFLT,
2002 .fc_metric = IP6_RT_PRIO_USER,
2003 .fc_ifindex = dev->ifindex,
2004 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
2005 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
2006 .fc_nlinfo.portid = 0,
2007 .fc_nlinfo.nlh = NULL,
2008 .fc_nlinfo.nl_net = dev_net(dev),
2011 cfg.fc_gateway = *gwaddr;
2013 ip6_route_add(&cfg);
2015 return rt6_get_dflt_router(gwaddr, dev);
2018 void rt6_purge_dflt_routers(struct net *net)
2020 struct rt6_info *rt;
2021 struct fib6_table *table;
2023 /* NOTE: Keep consistent with rt6_get_dflt_router */
2024 table = fib6_get_table(net, RT6_TABLE_DFLT);
2029 read_lock_bh(&table->tb6_lock);
2030 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
2031 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
2032 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
2034 read_unlock_bh(&table->tb6_lock);
2039 read_unlock_bh(&table->tb6_lock);
2042 static void rtmsg_to_fib6_config(struct net *net,
2043 struct in6_rtmsg *rtmsg,
2044 struct fib6_config *cfg)
2046 memset(cfg, 0, sizeof(*cfg));
2048 cfg->fc_table = RT6_TABLE_MAIN;
2049 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
2050 cfg->fc_metric = rtmsg->rtmsg_metric;
2051 cfg->fc_expires = rtmsg->rtmsg_info;
2052 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
2053 cfg->fc_src_len = rtmsg->rtmsg_src_len;
2054 cfg->fc_flags = rtmsg->rtmsg_flags;
2056 cfg->fc_nlinfo.nl_net = net;
2058 cfg->fc_dst = rtmsg->rtmsg_dst;
2059 cfg->fc_src = rtmsg->rtmsg_src;
2060 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2063 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2065 struct fib6_config cfg;
2066 struct in6_rtmsg rtmsg;
2070 case SIOCADDRT: /* Add a route */
2071 case SIOCDELRT: /* Delete a route */
2072 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2074 err = copy_from_user(&rtmsg, arg,
2075 sizeof(struct in6_rtmsg));
2079 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2084 err = ip6_route_add(&cfg);
2087 err = ip6_route_del(&cfg);
2101 * Drop the packet on the floor
2104 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2107 struct dst_entry *dst = skb_dst(skb);
2108 switch (ipstats_mib_noroutes) {
2109 case IPSTATS_MIB_INNOROUTES:
2110 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2111 if (type == IPV6_ADDR_ANY) {
2112 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2113 IPSTATS_MIB_INADDRERRORS);
2117 case IPSTATS_MIB_OUTNOROUTES:
2118 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2119 ipstats_mib_noroutes);
2122 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2127 static int ip6_pkt_discard(struct sk_buff *skb)
2129 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2132 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
2134 skb->dev = skb_dst(skb)->dev;
2135 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2138 static int ip6_pkt_prohibit(struct sk_buff *skb)
2140 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2143 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
2145 skb->dev = skb_dst(skb)->dev;
2146 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2150 * Allocate a dst for local (unicast / anycast) address.
2153 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2154 const struct in6_addr *addr,
2157 struct net *net = dev_net(idev->dev);
2158 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2161 return ERR_PTR(-ENOMEM);
2165 rt->dst.flags |= DST_HOST;
2166 rt->dst.input = ip6_input;
2167 rt->dst.output = ip6_output;
2168 rt->rt6i_idev = idev;
2170 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2172 rt->rt6i_flags |= RTF_ANYCAST;
2174 rt->rt6i_flags |= RTF_LOCAL;
2176 rt->rt6i_gateway = *addr;
2177 rt->rt6i_dst.addr = *addr;
2178 rt->rt6i_dst.plen = 128;
2179 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2181 atomic_set(&rt->dst.__refcnt, 1);
2186 int ip6_route_get_saddr(struct net *net,
2187 struct rt6_info *rt,
2188 const struct in6_addr *daddr,
2190 struct in6_addr *saddr)
2192 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2194 if (rt->rt6i_prefsrc.plen)
2195 *saddr = rt->rt6i_prefsrc.addr;
2197 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2198 daddr, prefs, saddr);
2202 /* remove deleted ip from prefsrc entries */
2203 struct arg_dev_net_ip {
2204 struct net_device *dev;
2206 struct in6_addr *addr;
2209 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2211 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2212 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2213 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2215 if (((void *)rt->dst.dev == dev || !dev) &&
2216 rt != net->ipv6.ip6_null_entry &&
2217 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2218 /* remove prefsrc entry */
2219 rt->rt6i_prefsrc.plen = 0;
2224 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2226 struct net *net = dev_net(ifp->idev->dev);
2227 struct arg_dev_net_ip adni = {
2228 .dev = ifp->idev->dev,
2232 fib6_clean_all(net, fib6_remove_prefsrc, &adni);
2235 struct arg_dev_net {
2236 struct net_device *dev;
2240 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2242 const struct arg_dev_net *adn = arg;
2243 const struct net_device *dev = adn->dev;
2245 if ((rt->dst.dev == dev || !dev) &&
2246 rt != adn->net->ipv6.ip6_null_entry)
2252 void rt6_ifdown(struct net *net, struct net_device *dev)
2254 struct arg_dev_net adn = {
2259 fib6_clean_all(net, fib6_ifdown, &adn);
2260 icmp6_clean_all(fib6_ifdown, &adn);
2263 struct rt6_mtu_change_arg {
2264 struct net_device *dev;
2268 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2270 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2271 struct inet6_dev *idev;
2273 /* In IPv6 pmtu discovery is not optional,
2274 so that RTAX_MTU lock cannot disable it.
2275 We still use this lock to block changes
2276 caused by addrconf/ndisc.
2279 idev = __in6_dev_get(arg->dev);
2283 /* For administrative MTU increase, there is no way to discover
2284 IPv6 PMTU increase, so PMTU increase should be updated here.
2285 Since RFC 1981 doesn't include administrative MTU increase
2286 update PMTU increase is a MUST. (i.e. jumbo frame)
2289 If new MTU is less than route PMTU, this new MTU will be the
2290 lowest MTU in the path, update the route PMTU to reflect PMTU
2291 decreases; if new MTU is greater than route PMTU, and the
2292 old MTU is the lowest MTU in the path, update the route PMTU
2293 to reflect the increase. In this case if the other nodes' MTU
2294 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2297 if (rt->dst.dev == arg->dev &&
2298 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2299 (dst_mtu(&rt->dst) >= arg->mtu ||
2300 (dst_mtu(&rt->dst) < arg->mtu &&
2301 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2302 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2307 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2309 struct rt6_mtu_change_arg arg = {
2314 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
2317 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2318 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2319 [RTA_OIF] = { .type = NLA_U32 },
2320 [RTA_IIF] = { .type = NLA_U32 },
2321 [RTA_PRIORITY] = { .type = NLA_U32 },
2322 [RTA_METRICS] = { .type = NLA_NESTED },
2323 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2326 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2327 struct fib6_config *cfg)
2330 struct nlattr *tb[RTA_MAX+1];
2333 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2338 rtm = nlmsg_data(nlh);
2339 memset(cfg, 0, sizeof(*cfg));
2341 cfg->fc_table = rtm->rtm_table;
2342 cfg->fc_dst_len = rtm->rtm_dst_len;
2343 cfg->fc_src_len = rtm->rtm_src_len;
2344 cfg->fc_flags = RTF_UP;
2345 cfg->fc_protocol = rtm->rtm_protocol;
2346 cfg->fc_type = rtm->rtm_type;
2348 if (rtm->rtm_type == RTN_UNREACHABLE ||
2349 rtm->rtm_type == RTN_BLACKHOLE ||
2350 rtm->rtm_type == RTN_PROHIBIT ||
2351 rtm->rtm_type == RTN_THROW)
2352 cfg->fc_flags |= RTF_REJECT;
2354 if (rtm->rtm_type == RTN_LOCAL)
2355 cfg->fc_flags |= RTF_LOCAL;
2357 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2358 cfg->fc_nlinfo.nlh = nlh;
2359 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2361 if (tb[RTA_GATEWAY]) {
2362 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2363 cfg->fc_flags |= RTF_GATEWAY;
2367 int plen = (rtm->rtm_dst_len + 7) >> 3;
2369 if (nla_len(tb[RTA_DST]) < plen)
2372 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2376 int plen = (rtm->rtm_src_len + 7) >> 3;
2378 if (nla_len(tb[RTA_SRC]) < plen)
2381 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2384 if (tb[RTA_PREFSRC])
2385 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2388 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2390 if (tb[RTA_PRIORITY])
2391 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2393 if (tb[RTA_METRICS]) {
2394 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2395 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2399 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2401 if (tb[RTA_MULTIPATH]) {
2402 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2403 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2411 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2413 struct fib6_config r_cfg;
2414 struct rtnexthop *rtnh;
2417 int err = 0, last_err = 0;
2420 rtnh = (struct rtnexthop *)cfg->fc_mp;
2421 remaining = cfg->fc_mp_len;
2423 /* Parse a Multipath Entry */
2424 while (rtnh_ok(rtnh, remaining)) {
2425 memcpy(&r_cfg, cfg, sizeof(*cfg));
2426 if (rtnh->rtnh_ifindex)
2427 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2429 attrlen = rtnh_attrlen(rtnh);
2431 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2433 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2435 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2436 r_cfg.fc_flags |= RTF_GATEWAY;
2439 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2442 /* If we are trying to remove a route, do not stop the
2443 * loop when ip6_route_del() fails (because next hop is
2444 * already gone), we should try to remove all next hops.
2447 /* If add fails, we should try to delete all
2448 * next hops that have been already added.
2454 /* Because each route is added like a single route we remove
2455 * this flag after the first nexthop (if there is a collision,
2456 * we have already fail to add the first nexthop:
2457 * fib6_add_rt2node() has reject it).
2459 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2460 rtnh = rtnh_next(rtnh, &remaining);
2466 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2468 struct fib6_config cfg;
2471 err = rtm_to_fib6_config(skb, nlh, &cfg);
2476 return ip6_route_multipath(&cfg, 0);
2478 return ip6_route_del(&cfg);
2481 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2483 struct fib6_config cfg;
2486 err = rtm_to_fib6_config(skb, nlh, &cfg);
2491 return ip6_route_multipath(&cfg, 1);
2493 return ip6_route_add(&cfg);
2496 static inline size_t rt6_nlmsg_size(void)
2498 return NLMSG_ALIGN(sizeof(struct rtmsg))
2499 + nla_total_size(16) /* RTA_SRC */
2500 + nla_total_size(16) /* RTA_DST */
2501 + nla_total_size(16) /* RTA_GATEWAY */
2502 + nla_total_size(16) /* RTA_PREFSRC */
2503 + nla_total_size(4) /* RTA_TABLE */
2504 + nla_total_size(4) /* RTA_IIF */
2505 + nla_total_size(4) /* RTA_OIF */
2506 + nla_total_size(4) /* RTA_PRIORITY */
2507 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2508 + nla_total_size(sizeof(struct rta_cacheinfo));
2511 static int rt6_fill_node(struct net *net,
2512 struct sk_buff *skb, struct rt6_info *rt,
2513 struct in6_addr *dst, struct in6_addr *src,
2514 int iif, int type, u32 portid, u32 seq,
2515 int prefix, int nowait, unsigned int flags)
2518 struct nlmsghdr *nlh;
2522 if (prefix) { /* user wants prefix routes only */
2523 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2524 /* success since this is not a prefix route */
2529 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2533 rtm = nlmsg_data(nlh);
2534 rtm->rtm_family = AF_INET6;
2535 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2536 rtm->rtm_src_len = rt->rt6i_src.plen;
2539 table = rt->rt6i_table->tb6_id;
2541 table = RT6_TABLE_UNSPEC;
2542 rtm->rtm_table = table;
2543 if (nla_put_u32(skb, RTA_TABLE, table))
2544 goto nla_put_failure;
2545 if (rt->rt6i_flags & RTF_REJECT) {
2546 switch (rt->dst.error) {
2548 rtm->rtm_type = RTN_BLACKHOLE;
2551 rtm->rtm_type = RTN_PROHIBIT;
2554 rtm->rtm_type = RTN_THROW;
2557 rtm->rtm_type = RTN_UNREACHABLE;
2561 else if (rt->rt6i_flags & RTF_LOCAL)
2562 rtm->rtm_type = RTN_LOCAL;
2563 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2564 rtm->rtm_type = RTN_LOCAL;
2566 rtm->rtm_type = RTN_UNICAST;
2568 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2569 rtm->rtm_protocol = rt->rt6i_protocol;
2570 if (rt->rt6i_flags & RTF_DYNAMIC)
2571 rtm->rtm_protocol = RTPROT_REDIRECT;
2572 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2573 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2574 rtm->rtm_protocol = RTPROT_RA;
2576 rtm->rtm_protocol = RTPROT_KERNEL;
2579 if (rt->rt6i_flags & RTF_CACHE)
2580 rtm->rtm_flags |= RTM_F_CLONED;
2583 if (nla_put(skb, RTA_DST, 16, dst))
2584 goto nla_put_failure;
2585 rtm->rtm_dst_len = 128;
2586 } else if (rtm->rtm_dst_len)
2587 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2588 goto nla_put_failure;
2589 #ifdef CONFIG_IPV6_SUBTREES
2591 if (nla_put(skb, RTA_SRC, 16, src))
2592 goto nla_put_failure;
2593 rtm->rtm_src_len = 128;
2594 } else if (rtm->rtm_src_len &&
2595 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2596 goto nla_put_failure;
2599 #ifdef CONFIG_IPV6_MROUTE
2600 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2601 int err = ip6mr_get_route(net, skb, rtm, nowait);
2606 goto nla_put_failure;
2608 if (err == -EMSGSIZE)
2609 goto nla_put_failure;
2614 if (nla_put_u32(skb, RTA_IIF, iif))
2615 goto nla_put_failure;
2617 struct in6_addr saddr_buf;
2618 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2619 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2620 goto nla_put_failure;
2623 if (rt->rt6i_prefsrc.plen) {
2624 struct in6_addr saddr_buf;
2625 saddr_buf = rt->rt6i_prefsrc.addr;
2626 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2627 goto nla_put_failure;
2630 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2631 goto nla_put_failure;
2633 if (rt->rt6i_flags & RTF_GATEWAY) {
2634 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2635 goto nla_put_failure;
2639 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2640 goto nla_put_failure;
2641 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2642 goto nla_put_failure;
2644 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2646 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2647 goto nla_put_failure;
2649 return nlmsg_end(skb, nlh);
2652 nlmsg_cancel(skb, nlh);
2656 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2658 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2661 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2662 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2663 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2667 return rt6_fill_node(arg->net,
2668 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2669 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2670 prefix, 0, NLM_F_MULTI);
2673 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2675 struct net *net = sock_net(in_skb->sk);
2676 struct nlattr *tb[RTA_MAX+1];
2677 struct rt6_info *rt;
2678 struct sk_buff *skb;
2681 int err, iif = 0, oif = 0;
2683 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2688 memset(&fl6, 0, sizeof(fl6));
2691 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2694 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2698 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2701 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2705 iif = nla_get_u32(tb[RTA_IIF]);
2708 oif = nla_get_u32(tb[RTA_OIF]);
2711 struct net_device *dev;
2714 dev = __dev_get_by_index(net, iif);
2720 fl6.flowi6_iif = iif;
2722 if (!ipv6_addr_any(&fl6.saddr))
2723 flags |= RT6_LOOKUP_F_HAS_SADDR;
2725 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2728 fl6.flowi6_oif = oif;
2730 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2733 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2740 /* Reserve room for dummy headers, this skb can pass
2741 through good chunk of routing engine.
2743 skb_reset_mac_header(skb);
2744 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2746 skb_dst_set(skb, &rt->dst);
2748 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2749 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2750 nlh->nlmsg_seq, 0, 0, 0);
2756 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2761 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2763 struct sk_buff *skb;
2764 struct net *net = info->nl_net;
2769 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2771 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2775 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2776 event, info->portid, seq, 0, 0, 0);
2778 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2779 WARN_ON(err == -EMSGSIZE);
2783 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2784 info->nlh, gfp_any());
2788 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2791 static int ip6_route_dev_notify(struct notifier_block *this,
2792 unsigned long event, void *ptr)
2794 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2795 struct net *net = dev_net(dev);
2797 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2798 net->ipv6.ip6_null_entry->dst.dev = dev;
2799 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2800 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2801 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2802 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2803 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2804 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2815 #ifdef CONFIG_PROC_FS
2817 static const struct file_operations ipv6_route_proc_fops = {
2818 .owner = THIS_MODULE,
2819 .open = ipv6_route_open,
2821 .llseek = seq_lseek,
2822 .release = seq_release_net,
2825 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2827 struct net *net = (struct net *)seq->private;
2828 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2829 net->ipv6.rt6_stats->fib_nodes,
2830 net->ipv6.rt6_stats->fib_route_nodes,
2831 net->ipv6.rt6_stats->fib_rt_alloc,
2832 net->ipv6.rt6_stats->fib_rt_entries,
2833 net->ipv6.rt6_stats->fib_rt_cache,
2834 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2835 net->ipv6.rt6_stats->fib_discarded_routes);
2840 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2842 return single_open_net(inode, file, rt6_stats_seq_show);
2845 static const struct file_operations rt6_stats_seq_fops = {
2846 .owner = THIS_MODULE,
2847 .open = rt6_stats_seq_open,
2849 .llseek = seq_lseek,
2850 .release = single_release_net,
2852 #endif /* CONFIG_PROC_FS */
2854 #ifdef CONFIG_SYSCTL
2857 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
2858 void __user *buffer, size_t *lenp, loff_t *ppos)
2865 net = (struct net *)ctl->extra1;
2866 delay = net->ipv6.sysctl.flush_delay;
2867 proc_dointvec(ctl, write, buffer, lenp, ppos);
2868 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
2872 struct ctl_table ipv6_route_table_template[] = {
2874 .procname = "flush",
2875 .data = &init_net.ipv6.sysctl.flush_delay,
2876 .maxlen = sizeof(int),
2878 .proc_handler = ipv6_sysctl_rtcache_flush
2881 .procname = "gc_thresh",
2882 .data = &ip6_dst_ops_template.gc_thresh,
2883 .maxlen = sizeof(int),
2885 .proc_handler = proc_dointvec,
2888 .procname = "max_size",
2889 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2890 .maxlen = sizeof(int),
2892 .proc_handler = proc_dointvec,
2895 .procname = "gc_min_interval",
2896 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2897 .maxlen = sizeof(int),
2899 .proc_handler = proc_dointvec_jiffies,
2902 .procname = "gc_timeout",
2903 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2904 .maxlen = sizeof(int),
2906 .proc_handler = proc_dointvec_jiffies,
2909 .procname = "gc_interval",
2910 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2911 .maxlen = sizeof(int),
2913 .proc_handler = proc_dointvec_jiffies,
2916 .procname = "gc_elasticity",
2917 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2918 .maxlen = sizeof(int),
2920 .proc_handler = proc_dointvec,
2923 .procname = "mtu_expires",
2924 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2925 .maxlen = sizeof(int),
2927 .proc_handler = proc_dointvec_jiffies,
2930 .procname = "min_adv_mss",
2931 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2932 .maxlen = sizeof(int),
2934 .proc_handler = proc_dointvec,
2937 .procname = "gc_min_interval_ms",
2938 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2939 .maxlen = sizeof(int),
2941 .proc_handler = proc_dointvec_ms_jiffies,
2946 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2948 struct ctl_table *table;
2950 table = kmemdup(ipv6_route_table_template,
2951 sizeof(ipv6_route_table_template),
2955 table[0].data = &net->ipv6.sysctl.flush_delay;
2956 table[0].extra1 = net;
2957 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2958 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2959 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2960 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2961 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2962 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2963 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2964 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2965 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2967 /* Don't export sysctls to unprivileged users */
2968 if (net->user_ns != &init_user_ns)
2969 table[0].procname = NULL;
2976 static int __net_init ip6_route_net_init(struct net *net)
2980 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2981 sizeof(net->ipv6.ip6_dst_ops));
2983 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2984 goto out_ip6_dst_ops;
2986 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2987 sizeof(*net->ipv6.ip6_null_entry),
2989 if (!net->ipv6.ip6_null_entry)
2990 goto out_ip6_dst_entries;
2991 net->ipv6.ip6_null_entry->dst.path =
2992 (struct dst_entry *)net->ipv6.ip6_null_entry;
2993 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2994 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2995 ip6_template_metrics, true);
2997 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2998 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2999 sizeof(*net->ipv6.ip6_prohibit_entry),
3001 if (!net->ipv6.ip6_prohibit_entry)
3002 goto out_ip6_null_entry;
3003 net->ipv6.ip6_prohibit_entry->dst.path =
3004 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
3005 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3006 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
3007 ip6_template_metrics, true);
3009 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
3010 sizeof(*net->ipv6.ip6_blk_hole_entry),
3012 if (!net->ipv6.ip6_blk_hole_entry)
3013 goto out_ip6_prohibit_entry;
3014 net->ipv6.ip6_blk_hole_entry->dst.path =
3015 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3016 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3017 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3018 ip6_template_metrics, true);
3021 net->ipv6.sysctl.flush_delay = 0;
3022 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3023 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3024 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3025 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3026 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3027 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3028 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3030 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3036 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3037 out_ip6_prohibit_entry:
3038 kfree(net->ipv6.ip6_prohibit_entry);
3040 kfree(net->ipv6.ip6_null_entry);
3042 out_ip6_dst_entries:
3043 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3048 static void __net_exit ip6_route_net_exit(struct net *net)
3050 kfree(net->ipv6.ip6_null_entry);
3051 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3052 kfree(net->ipv6.ip6_prohibit_entry);
3053 kfree(net->ipv6.ip6_blk_hole_entry);
3055 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3058 static int __net_init ip6_route_net_init_late(struct net *net)
3060 #ifdef CONFIG_PROC_FS
3061 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3062 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3067 static void __net_exit ip6_route_net_exit_late(struct net *net)
3069 #ifdef CONFIG_PROC_FS
3070 remove_proc_entry("ipv6_route", net->proc_net);
3071 remove_proc_entry("rt6_stats", net->proc_net);
3075 static struct pernet_operations ip6_route_net_ops = {
3076 .init = ip6_route_net_init,
3077 .exit = ip6_route_net_exit,
3080 static int __net_init ipv6_inetpeer_init(struct net *net)
3082 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3086 inet_peer_base_init(bp);
3087 net->ipv6.peers = bp;
3091 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3093 struct inet_peer_base *bp = net->ipv6.peers;
3095 net->ipv6.peers = NULL;
3096 inetpeer_invalidate_tree(bp);
3100 static struct pernet_operations ipv6_inetpeer_ops = {
3101 .init = ipv6_inetpeer_init,
3102 .exit = ipv6_inetpeer_exit,
3105 static struct pernet_operations ip6_route_net_late_ops = {
3106 .init = ip6_route_net_init_late,
3107 .exit = ip6_route_net_exit_late,
3110 static struct notifier_block ip6_route_dev_notifier = {
3111 .notifier_call = ip6_route_dev_notify,
3115 int __init ip6_route_init(void)
3120 ip6_dst_ops_template.kmem_cachep =
3121 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3122 SLAB_HWCACHE_ALIGN, NULL);
3123 if (!ip6_dst_ops_template.kmem_cachep)
3126 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3128 goto out_kmem_cache;
3130 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3132 goto out_dst_entries;
3134 ret = register_pernet_subsys(&ip6_route_net_ops);
3136 goto out_register_inetpeer;
3138 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3140 /* Registering of the loopback is done before this portion of code,
3141 * the loopback reference in rt6_info will not be taken, do it
3142 * manually for init_net */
3143 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3144 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3145 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3146 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3147 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3148 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3149 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3153 goto out_register_subsys;
3159 ret = fib6_rules_init();
3163 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3165 goto fib6_rules_init;
3168 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3169 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3170 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3171 goto out_register_late_subsys;
3173 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3175 goto out_register_late_subsys;
3180 out_register_late_subsys:
3181 unregister_pernet_subsys(&ip6_route_net_late_ops);
3183 fib6_rules_cleanup();
3188 out_register_subsys:
3189 unregister_pernet_subsys(&ip6_route_net_ops);
3190 out_register_inetpeer:
3191 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3193 dst_entries_destroy(&ip6_dst_blackhole_ops);
3195 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3199 void ip6_route_cleanup(void)
3201 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3202 unregister_pernet_subsys(&ip6_route_net_late_ops);
3203 fib6_rules_cleanup();
3206 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3207 unregister_pernet_subsys(&ip6_route_net_ops);
3208 dst_entries_destroy(&ip6_dst_blackhole_ops);
3209 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);