2 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
24 * Fixed routing subtrees.
27 #define pr_fmt(fmt) "IPv6: " fmt
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
55 #include <linux/rtnetlink.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
62 #include <asm/uaccess.h>
65 #include <linux/sysctl.h>
69 RT6_NUD_FAIL_HARD = -2,
70 RT6_NUD_FAIL_SOFT = -1,
74 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
75 const struct in6_addr *dest);
76 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
77 static unsigned int ip6_default_advmss(const struct dst_entry *dst);
78 static unsigned int ip6_mtu(const struct dst_entry *dst);
79 static struct dst_entry *ip6_negative_advice(struct dst_entry *);
80 static void ip6_dst_destroy(struct dst_entry *);
81 static void ip6_dst_ifdown(struct dst_entry *,
82 struct net_device *dev, int how);
83 static int ip6_dst_gc(struct dst_ops *ops);
85 static int ip6_pkt_discard(struct sk_buff *skb);
86 static int ip6_pkt_discard_out(struct sk_buff *skb);
87 static int ip6_pkt_prohibit(struct sk_buff *skb);
88 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
89 static void ip6_link_failure(struct sk_buff *skb);
90 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
91 struct sk_buff *skb, u32 mtu);
92 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
95 #ifdef CONFIG_IPV6_ROUTE_INFO
96 static struct rt6_info *rt6_add_route_info(struct net *net,
97 const struct in6_addr *prefix, int prefixlen,
98 const struct in6_addr *gwaddr, int ifindex,
100 static struct rt6_info *rt6_get_route_info(struct net *net,
101 const struct in6_addr *prefix, int prefixlen,
102 const struct in6_addr *gwaddr, int ifindex);
105 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
107 struct rt6_info *rt = (struct rt6_info *) dst;
108 struct inet_peer *peer;
111 if (!(rt->dst.flags & DST_HOST))
114 peer = rt6_get_peer_create(rt);
116 u32 *old_p = __DST_METRICS_PTR(old);
117 unsigned long prev, new;
120 if (inet_metrics_new(peer))
121 memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
123 new = (unsigned long) p;
124 prev = cmpxchg(&dst->_metrics, old, new);
127 p = __DST_METRICS_PTR(prev);
128 if (prev & DST_METRICS_READ_ONLY)
135 static inline const void *choose_neigh_daddr(struct rt6_info *rt,
139 struct in6_addr *p = &rt->rt6i_gateway;
141 if (!ipv6_addr_any(p))
142 return (const void *) p;
144 return &ipv6_hdr(skb)->daddr;
148 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
152 struct rt6_info *rt = (struct rt6_info *) dst;
155 daddr = choose_neigh_daddr(rt, skb, daddr);
156 n = __ipv6_neigh_lookup(dst->dev, daddr);
159 return neigh_create(&nd_tbl, daddr, dst->dev);
162 static struct dst_ops ip6_dst_ops_template = {
164 .protocol = cpu_to_be16(ETH_P_IPV6),
167 .check = ip6_dst_check,
168 .default_advmss = ip6_default_advmss,
170 .cow_metrics = ipv6_cow_metrics,
171 .destroy = ip6_dst_destroy,
172 .ifdown = ip6_dst_ifdown,
173 .negative_advice = ip6_negative_advice,
174 .link_failure = ip6_link_failure,
175 .update_pmtu = ip6_rt_update_pmtu,
176 .redirect = rt6_do_redirect,
177 .local_out = __ip6_local_out,
178 .neigh_lookup = ip6_neigh_lookup,
181 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
183 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
185 return mtu ? : dst->dev->mtu;
188 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
189 struct sk_buff *skb, u32 mtu)
193 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
198 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst,
204 static struct dst_ops ip6_dst_blackhole_ops = {
206 .protocol = cpu_to_be16(ETH_P_IPV6),
207 .destroy = ip6_dst_destroy,
208 .check = ip6_dst_check,
209 .mtu = ip6_blackhole_mtu,
210 .default_advmss = ip6_default_advmss,
211 .update_pmtu = ip6_rt_blackhole_update_pmtu,
212 .redirect = ip6_rt_blackhole_redirect,
213 .cow_metrics = ip6_rt_blackhole_cow_metrics,
214 .neigh_lookup = ip6_neigh_lookup,
217 static const u32 ip6_template_metrics[RTAX_MAX] = {
218 [RTAX_HOPLIMIT - 1] = 0,
221 static const struct rt6_info ip6_null_entry_template = {
223 .__refcnt = ATOMIC_INIT(1),
225 .obsolete = DST_OBSOLETE_FORCE_CHK,
226 .error = -ENETUNREACH,
227 .input = ip6_pkt_discard,
228 .output = ip6_pkt_discard_out,
230 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
231 .rt6i_protocol = RTPROT_KERNEL,
232 .rt6i_metric = ~(u32) 0,
233 .rt6i_ref = ATOMIC_INIT(1),
236 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
238 static const struct rt6_info ip6_prohibit_entry_template = {
240 .__refcnt = ATOMIC_INIT(1),
242 .obsolete = DST_OBSOLETE_FORCE_CHK,
244 .input = ip6_pkt_prohibit,
245 .output = ip6_pkt_prohibit_out,
247 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
248 .rt6i_protocol = RTPROT_KERNEL,
249 .rt6i_metric = ~(u32) 0,
250 .rt6i_ref = ATOMIC_INIT(1),
253 static const struct rt6_info ip6_blk_hole_entry_template = {
255 .__refcnt = ATOMIC_INIT(1),
257 .obsolete = DST_OBSOLETE_FORCE_CHK,
259 .input = dst_discard,
260 .output = dst_discard,
262 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
263 .rt6i_protocol = RTPROT_KERNEL,
264 .rt6i_metric = ~(u32) 0,
265 .rt6i_ref = ATOMIC_INIT(1),
270 /* allocate dst with ip6_dst_ops */
271 static inline struct rt6_info *ip6_dst_alloc(struct net *net,
272 struct net_device *dev,
274 struct fib6_table *table)
276 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
277 0, DST_OBSOLETE_FORCE_CHK, flags);
280 struct dst_entry *dst = &rt->dst;
282 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
283 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
284 rt->rt6i_genid = rt_genid(net);
285 INIT_LIST_HEAD(&rt->rt6i_siblings);
286 rt->rt6i_nsiblings = 0;
291 static void ip6_dst_destroy(struct dst_entry *dst)
293 struct rt6_info *rt = (struct rt6_info *)dst;
294 struct inet6_dev *idev = rt->rt6i_idev;
295 struct dst_entry *from = dst->from;
297 if (!(rt->dst.flags & DST_HOST))
298 dst_destroy_metrics_generic(dst);
301 rt->rt6i_idev = NULL;
308 if (rt6_has_peer(rt)) {
309 struct inet_peer *peer = rt6_peer_ptr(rt);
314 void rt6_bind_peer(struct rt6_info *rt, int create)
316 struct inet_peer_base *base;
317 struct inet_peer *peer;
319 base = inetpeer_base_ptr(rt->_rt6i_peer);
323 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create);
325 if (!rt6_set_peer(rt, peer))
330 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
333 struct rt6_info *rt = (struct rt6_info *)dst;
334 struct inet6_dev *idev = rt->rt6i_idev;
335 struct net_device *loopback_dev =
336 dev_net(dev)->loopback_dev;
338 if (dev != loopback_dev) {
339 if (idev && idev->dev == dev) {
340 struct inet6_dev *loopback_idev =
341 in6_dev_get(loopback_dev);
343 rt->rt6i_idev = loopback_idev;
350 static bool rt6_check_expired(const struct rt6_info *rt)
352 if (rt->rt6i_flags & RTF_EXPIRES) {
353 if (time_after(jiffies, rt->dst.expires))
355 } else if (rt->dst.from) {
356 return rt6_check_expired((struct rt6_info *) rt->dst.from);
361 static bool rt6_need_strict(const struct in6_addr *daddr)
363 return ipv6_addr_type(daddr) &
364 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
367 /* Multipath route selection:
368 * Hash based function using packet header and flowlabel.
369 * Adapted from fib_info_hashfn()
371 static int rt6_info_hash_nhsfn(unsigned int candidate_count,
372 const struct flowi6 *fl6)
374 unsigned int val = fl6->flowi6_proto;
376 val ^= ipv6_addr_hash(&fl6->daddr);
377 val ^= ipv6_addr_hash(&fl6->saddr);
379 /* Work only if this not encapsulated */
380 switch (fl6->flowi6_proto) {
384 val ^= (__force u16)fl6->fl6_sport;
385 val ^= (__force u16)fl6->fl6_dport;
389 val ^= (__force u16)fl6->fl6_icmp_type;
390 val ^= (__force u16)fl6->fl6_icmp_code;
393 /* RFC6438 recommands to use flowlabel */
394 val ^= (__force u32)fl6->flowlabel;
396 /* Perhaps, we need to tune, this function? */
397 val = val ^ (val >> 7) ^ (val >> 12);
398 return val % candidate_count;
401 static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
404 struct rt6_info *sibling, *next_sibling;
407 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
408 /* Don't change the route, if route_choosen == 0
409 * (siblings does not include ourself)
412 list_for_each_entry_safe(sibling, next_sibling,
413 &match->rt6i_siblings, rt6i_siblings) {
415 if (route_choosen == 0) {
424 * Route lookup. Any table->tb6_lock is implied.
427 static inline struct rt6_info *rt6_device_match(struct net *net,
429 const struct in6_addr *saddr,
433 struct rt6_info *local = NULL;
434 struct rt6_info *sprt;
436 if (!oif && ipv6_addr_any(saddr))
439 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
440 struct net_device *dev = sprt->dst.dev;
443 if (dev->ifindex == oif)
445 if (dev->flags & IFF_LOOPBACK) {
446 if (!sprt->rt6i_idev ||
447 sprt->rt6i_idev->dev->ifindex != oif) {
448 if (flags & RT6_LOOKUP_F_IFACE && oif)
450 if (local && (!oif ||
451 local->rt6i_idev->dev->ifindex == oif))
457 if (ipv6_chk_addr(net, saddr, dev,
458 flags & RT6_LOOKUP_F_IFACE))
467 if (flags & RT6_LOOKUP_F_IFACE)
468 return net->ipv6.ip6_null_entry;
474 #ifdef CONFIG_IPV6_ROUTER_PREF
475 struct __rt6_probe_work {
476 struct work_struct work;
477 struct in6_addr target;
478 struct net_device *dev;
481 static void rt6_probe_deferred(struct work_struct *w)
483 struct in6_addr mcaddr;
484 struct __rt6_probe_work *work =
485 container_of(w, struct __rt6_probe_work, work);
487 addrconf_addr_solict_mult(&work->target, &mcaddr);
488 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);
493 static void rt6_probe(struct rt6_info *rt)
495 struct neighbour *neigh;
497 * Okay, this does not seem to be appropriate
498 * for now, however, we need to check if it
499 * is really so; aka Router Reachability Probing.
501 * Router Reachability Probe MUST be rate-limited
502 * to no more than one per minute.
504 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
507 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
509 write_lock(&neigh->lock);
510 if (neigh->nud_state & NUD_VALID)
515 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
516 struct __rt6_probe_work *work;
518 work = kmalloc(sizeof(*work), GFP_ATOMIC);
521 neigh->updated = jiffies;
524 write_unlock(&neigh->lock);
527 INIT_WORK(&work->work, rt6_probe_deferred);
528 work->target = rt->rt6i_gateway;
529 dev_hold(rt->dst.dev);
530 work->dev = rt->dst.dev;
531 schedule_work(&work->work);
535 write_unlock(&neigh->lock);
537 rcu_read_unlock_bh();
540 static inline void rt6_probe(struct rt6_info *rt)
546 * Default Router Selection (RFC 2461 6.3.6)
548 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
550 struct net_device *dev = rt->dst.dev;
551 if (!oif || dev->ifindex == oif)
553 if ((dev->flags & IFF_LOOPBACK) &&
554 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
559 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
561 struct neighbour *neigh;
562 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
564 if (rt->rt6i_flags & RTF_NONEXTHOP ||
565 !(rt->rt6i_flags & RTF_GATEWAY))
566 return RT6_NUD_SUCCEED;
569 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
571 read_lock(&neigh->lock);
572 if (neigh->nud_state & NUD_VALID)
573 ret = RT6_NUD_SUCCEED;
574 #ifdef CONFIG_IPV6_ROUTER_PREF
575 else if (!(neigh->nud_state & NUD_FAILED))
576 ret = RT6_NUD_SUCCEED;
578 read_unlock(&neigh->lock);
580 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
581 RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT;
583 rcu_read_unlock_bh();
588 static int rt6_score_route(struct rt6_info *rt, int oif,
593 m = rt6_check_dev(rt, oif);
594 if (!m && (strict & RT6_LOOKUP_F_IFACE))
595 return RT6_NUD_FAIL_HARD;
596 #ifdef CONFIG_IPV6_ROUTER_PREF
597 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
599 if (strict & RT6_LOOKUP_F_REACHABLE) {
600 int n = rt6_check_neigh(rt);
607 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
608 int *mpri, struct rt6_info *match,
612 bool match_do_rr = false;
614 if (rt6_check_expired(rt))
617 m = rt6_score_route(rt, oif, strict);
618 if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) {
620 m = 0; /* lowest valid score */
625 if (strict & RT6_LOOKUP_F_REACHABLE)
629 *do_rr = match_do_rr;
637 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
638 struct rt6_info *rr_head,
639 u32 metric, int oif, int strict,
642 struct rt6_info *rt, *match;
646 for (rt = rr_head; rt && rt->rt6i_metric == metric;
647 rt = rt->dst.rt6_next)
648 match = find_match(rt, oif, strict, &mpri, match, do_rr);
649 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
650 rt = rt->dst.rt6_next)
651 match = find_match(rt, oif, strict, &mpri, match, do_rr);
656 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
658 struct rt6_info *match, *rt0;
664 fn->rr_ptr = rt0 = fn->leaf;
666 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
670 struct rt6_info *next = rt0->dst.rt6_next;
672 /* no entries matched; do round-robin */
673 if (!next || next->rt6i_metric != rt0->rt6i_metric)
680 net = dev_net(rt0->dst.dev);
681 return match ? match : net->ipv6.ip6_null_entry;
684 #ifdef CONFIG_IPV6_ROUTE_INFO
685 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
686 const struct in6_addr *gwaddr)
688 struct net *net = dev_net(dev);
689 struct route_info *rinfo = (struct route_info *) opt;
690 struct in6_addr prefix_buf, *prefix;
692 unsigned long lifetime;
695 if (len < sizeof(struct route_info)) {
699 /* Sanity check for prefix_len and length */
700 if (rinfo->length > 3) {
702 } else if (rinfo->prefix_len > 128) {
704 } else if (rinfo->prefix_len > 64) {
705 if (rinfo->length < 2) {
708 } else if (rinfo->prefix_len > 0) {
709 if (rinfo->length < 1) {
714 pref = rinfo->route_pref;
715 if (pref == ICMPV6_ROUTER_PREF_INVALID)
718 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
720 if (rinfo->length == 3)
721 prefix = (struct in6_addr *)rinfo->prefix;
723 /* this function is safe */
724 ipv6_addr_prefix(&prefix_buf,
725 (struct in6_addr *)rinfo->prefix,
727 prefix = &prefix_buf;
730 if (rinfo->prefix_len == 0)
731 rt = rt6_get_dflt_router(gwaddr, dev);
733 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
734 gwaddr, dev->ifindex);
736 if (rt && !lifetime) {
742 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
745 rt->rt6i_flags = RTF_ROUTEINFO |
746 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
749 if (!addrconf_finite_timeout(lifetime))
750 rt6_clean_expires(rt);
752 rt6_set_expires(rt, jiffies + HZ * lifetime);
760 #define BACKTRACK(__net, saddr) \
762 if (rt == __net->ipv6.ip6_null_entry) { \
763 struct fib6_node *pn; \
765 if (fn->fn_flags & RTN_TL_ROOT) \
768 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
769 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
772 if (fn->fn_flags & RTN_RTINFO) \
778 static struct rt6_info *ip6_pol_route_lookup(struct net *net,
779 struct fib6_table *table,
780 struct flowi6 *fl6, int flags)
782 struct fib6_node *fn;
785 read_lock_bh(&table->tb6_lock);
786 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
789 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
790 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
791 rt = rt6_multipath_select(rt, fl6);
792 BACKTRACK(net, &fl6->saddr);
794 dst_use(&rt->dst, jiffies);
795 read_unlock_bh(&table->tb6_lock);
800 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6,
803 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
805 EXPORT_SYMBOL_GPL(ip6_route_lookup);
807 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
808 const struct in6_addr *saddr, int oif, int strict)
810 struct flowi6 fl6 = {
814 struct dst_entry *dst;
815 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
818 memcpy(&fl6.saddr, saddr, sizeof(*saddr));
819 flags |= RT6_LOOKUP_F_HAS_SADDR;
822 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
824 return (struct rt6_info *) dst;
831 EXPORT_SYMBOL(rt6_lookup);
833 /* ip6_ins_rt is called with FREE table->tb6_lock.
834 It takes new route entry, the addition fails by any reason the
835 route is freed. In any case, if caller does not hold it, it may
839 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
842 struct fib6_table *table;
844 table = rt->rt6i_table;
845 write_lock_bh(&table->tb6_lock);
846 err = fib6_add(&table->tb6_root, rt, info);
847 write_unlock_bh(&table->tb6_lock);
852 int ip6_ins_rt(struct rt6_info *rt)
854 struct nl_info info = {
855 .nl_net = dev_net(rt->dst.dev),
857 return __ip6_ins_rt(rt, &info);
860 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort,
861 const struct in6_addr *daddr,
862 const struct in6_addr *saddr)
870 rt = ip6_rt_copy(ort, daddr);
873 if (!(rt->rt6i_flags & RTF_GATEWAY)) {
874 if (ort->rt6i_dst.plen != 128 &&
875 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
876 rt->rt6i_flags |= RTF_ANYCAST;
879 rt->rt6i_flags |= RTF_CACHE;
881 #ifdef CONFIG_IPV6_SUBTREES
882 if (rt->rt6i_src.plen && saddr) {
883 rt->rt6i_src.addr = *saddr;
884 rt->rt6i_src.plen = 128;
892 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort,
893 const struct in6_addr *daddr)
895 struct rt6_info *rt = ip6_rt_copy(ort, daddr);
898 rt->rt6i_flags |= RTF_CACHE;
902 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif,
903 struct flowi6 *fl6, int flags)
905 struct fib6_node *fn;
906 struct rt6_info *rt, *nrt;
910 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
912 strict |= flags & RT6_LOOKUP_F_IFACE;
915 read_lock_bh(&table->tb6_lock);
918 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
921 rt = rt6_select(fn, oif, strict | reachable);
922 if (rt->rt6i_nsiblings && oif == 0)
923 rt = rt6_multipath_select(rt, fl6);
924 BACKTRACK(net, &fl6->saddr);
925 if (rt == net->ipv6.ip6_null_entry ||
926 rt->rt6i_flags & RTF_CACHE)
930 read_unlock_bh(&table->tb6_lock);
932 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
933 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
934 else if (!(rt->dst.flags & DST_HOST))
935 nrt = rt6_alloc_clone(rt, &fl6->daddr);
940 rt = nrt ? : net->ipv6.ip6_null_entry;
944 err = ip6_ins_rt(nrt);
953 * Race condition! In the gap, when table->tb6_lock was
954 * released someone could insert this route. Relookup.
965 read_unlock_bh(&table->tb6_lock);
967 rt->dst.lastuse = jiffies;
973 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
974 struct flowi6 *fl6, int flags)
976 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
979 static struct dst_entry *ip6_route_input_lookup(struct net *net,
980 struct net_device *dev,
981 struct flowi6 *fl6, int flags)
983 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
984 flags |= RT6_LOOKUP_F_IFACE;
986 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
989 void ip6_route_input(struct sk_buff *skb)
991 const struct ipv6hdr *iph = ipv6_hdr(skb);
992 struct net *net = dev_net(skb->dev);
993 int flags = RT6_LOOKUP_F_HAS_SADDR;
994 struct flowi6 fl6 = {
995 .flowi6_iif = skb->dev->ifindex,
998 .flowlabel = ip6_flowinfo(iph),
999 .flowi6_mark = skb->mark,
1000 .flowi6_proto = iph->nexthdr,
1003 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
1006 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
1007 struct flowi6 *fl6, int flags)
1009 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
1012 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk,
1017 fl6->flowi6_iif = LOOPBACK_IFINDEX;
1019 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr))
1020 flags |= RT6_LOOKUP_F_IFACE;
1022 if (!ipv6_addr_any(&fl6->saddr))
1023 flags |= RT6_LOOKUP_F_HAS_SADDR;
1025 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
1027 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
1030 EXPORT_SYMBOL(ip6_route_output);
1032 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
1034 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
1035 struct dst_entry *new = NULL;
1037 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
1041 memset(new + 1, 0, sizeof(*rt) - sizeof(*new));
1042 rt6_init_peer(rt, net->ipv6.peers);
1045 new->input = dst_discard;
1046 new->output = dst_discard;
1048 if (dst_metrics_read_only(&ort->dst))
1049 new->_metrics = ort->dst._metrics;
1051 dst_copy_metrics(new, &ort->dst);
1052 rt->rt6i_idev = ort->rt6i_idev;
1054 in6_dev_hold(rt->rt6i_idev);
1056 rt->rt6i_gateway = ort->rt6i_gateway;
1057 rt->rt6i_flags = ort->rt6i_flags;
1058 rt->rt6i_metric = 0;
1060 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1061 #ifdef CONFIG_IPV6_SUBTREES
1062 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1068 dst_release(dst_orig);
1069 return new ? new : ERR_PTR(-ENOMEM);
1073 * Destination cache support functions
1076 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
1078 struct rt6_info *rt;
1080 rt = (struct rt6_info *) dst;
1082 /* All IPV6 dsts are created with ->obsolete set to the value
1083 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1084 * into this function always.
1086 if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
1089 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
1092 if (rt6_check_expired(rt))
1098 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
1100 struct rt6_info *rt = (struct rt6_info *) dst;
1103 if (rt->rt6i_flags & RTF_CACHE) {
1104 if (rt6_check_expired(rt)) {
1116 static void ip6_link_failure(struct sk_buff *skb)
1118 struct rt6_info *rt;
1120 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
1122 rt = (struct rt6_info *) skb_dst(skb);
1124 if (rt->rt6i_flags & RTF_CACHE) {
1128 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
1129 rt->rt6i_node->fn_sernum = -1;
1134 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
1135 struct sk_buff *skb, u32 mtu)
1137 struct rt6_info *rt6 = (struct rt6_info*)dst;
1140 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
1141 struct net *net = dev_net(dst->dev);
1143 rt6->rt6i_flags |= RTF_MODIFIED;
1144 if (mtu < IPV6_MIN_MTU) {
1145 u32 features = dst_metric(dst, RTAX_FEATURES);
1147 features |= RTAX_FEATURE_ALLFRAG;
1148 dst_metric_set(dst, RTAX_FEATURES, features);
1150 dst_metric_set(dst, RTAX_MTU, mtu);
1151 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires);
1155 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
1158 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1159 struct dst_entry *dst;
1162 memset(&fl6, 0, sizeof(fl6));
1163 fl6.flowi6_oif = oif;
1164 fl6.flowi6_mark = mark;
1165 fl6.flowi6_flags = 0;
1166 fl6.daddr = iph->daddr;
1167 fl6.saddr = iph->saddr;
1168 fl6.flowlabel = ip6_flowinfo(iph);
1170 dst = ip6_route_output(net, NULL, &fl6);
1172 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu));
1175 EXPORT_SYMBOL_GPL(ip6_update_pmtu);
1177 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
1179 ip6_update_pmtu(skb, sock_net(sk), mtu,
1180 sk->sk_bound_dev_if, sk->sk_mark);
1182 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
1184 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
1186 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
1187 struct dst_entry *dst;
1190 memset(&fl6, 0, sizeof(fl6));
1191 fl6.flowi6_oif = oif;
1192 fl6.flowi6_mark = mark;
1193 fl6.flowi6_flags = 0;
1194 fl6.daddr = iph->daddr;
1195 fl6.saddr = iph->saddr;
1196 fl6.flowlabel = ip6_flowinfo(iph);
1198 dst = ip6_route_output(net, NULL, &fl6);
1200 rt6_do_redirect(dst, NULL, skb);
1203 EXPORT_SYMBOL_GPL(ip6_redirect);
1205 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
1207 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
1209 EXPORT_SYMBOL_GPL(ip6_sk_redirect);
1211 static unsigned int ip6_default_advmss(const struct dst_entry *dst)
1213 struct net_device *dev = dst->dev;
1214 unsigned int mtu = dst_mtu(dst);
1215 struct net *net = dev_net(dev);
1217 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
1219 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
1220 mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
1223 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1224 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1225 * IPV6_MAXPLEN is also valid and means: "any MSS,
1226 * rely only on pmtu discovery"
1228 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
1233 static unsigned int ip6_mtu(const struct dst_entry *dst)
1235 struct inet6_dev *idev;
1236 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
1244 idev = __in6_dev_get(dst->dev);
1246 mtu = idev->cnf.mtu6;
1252 static struct dst_entry *icmp6_dst_gc_list;
1253 static DEFINE_SPINLOCK(icmp6_dst_lock);
1255 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
1258 struct dst_entry *dst;
1259 struct rt6_info *rt;
1260 struct inet6_dev *idev = in6_dev_get(dev);
1261 struct net *net = dev_net(dev);
1263 if (unlikely(!idev))
1264 return ERR_PTR(-ENODEV);
1266 rt = ip6_dst_alloc(net, dev, 0, NULL);
1267 if (unlikely(!rt)) {
1269 dst = ERR_PTR(-ENOMEM);
1273 rt->dst.flags |= DST_HOST;
1274 rt->dst.output = ip6_output;
1275 atomic_set(&rt->dst.__refcnt, 1);
1276 rt->rt6i_gateway = fl6->daddr;
1277 rt->rt6i_dst.addr = fl6->daddr;
1278 rt->rt6i_dst.plen = 128;
1279 rt->rt6i_idev = idev;
1280 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
1282 spin_lock_bh(&icmp6_dst_lock);
1283 rt->dst.next = icmp6_dst_gc_list;
1284 icmp6_dst_gc_list = &rt->dst;
1285 spin_unlock_bh(&icmp6_dst_lock);
1287 fib6_force_start_gc(net);
1289 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
1295 int icmp6_dst_gc(void)
1297 struct dst_entry *dst, **pprev;
1300 spin_lock_bh(&icmp6_dst_lock);
1301 pprev = &icmp6_dst_gc_list;
1303 while ((dst = *pprev) != NULL) {
1304 if (!atomic_read(&dst->__refcnt)) {
1313 spin_unlock_bh(&icmp6_dst_lock);
1318 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
1321 struct dst_entry *dst, **pprev;
1323 spin_lock_bh(&icmp6_dst_lock);
1324 pprev = &icmp6_dst_gc_list;
1325 while ((dst = *pprev) != NULL) {
1326 struct rt6_info *rt = (struct rt6_info *) dst;
1327 if (func(rt, arg)) {
1334 spin_unlock_bh(&icmp6_dst_lock);
1337 static int ip6_dst_gc(struct dst_ops *ops)
1339 unsigned long now = jiffies;
1340 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
1341 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
1342 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
1343 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
1344 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
1345 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
1348 entries = dst_entries_get_fast(ops);
1349 if (time_after(rt_last_gc + rt_min_interval, now) &&
1350 entries <= rt_max_size)
1353 net->ipv6.ip6_rt_gc_expire++;
1354 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net);
1355 net->ipv6.ip6_rt_last_gc = now;
1356 entries = dst_entries_get_slow(ops);
1357 if (entries < ops->gc_thresh)
1358 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
1360 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
1361 return entries > rt_max_size;
1364 int ip6_dst_hoplimit(struct dst_entry *dst)
1366 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
1367 if (hoplimit == 0) {
1368 struct net_device *dev = dst->dev;
1369 struct inet6_dev *idev;
1372 idev = __in6_dev_get(dev);
1374 hoplimit = idev->cnf.hop_limit;
1376 hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
1381 EXPORT_SYMBOL(ip6_dst_hoplimit);
1387 int ip6_route_add(struct fib6_config *cfg)
1390 struct net *net = cfg->fc_nlinfo.nl_net;
1391 struct rt6_info *rt = NULL;
1392 struct net_device *dev = NULL;
1393 struct inet6_dev *idev = NULL;
1394 struct fib6_table *table;
1397 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1399 #ifndef CONFIG_IPV6_SUBTREES
1400 if (cfg->fc_src_len)
1403 if (cfg->fc_ifindex) {
1405 dev = dev_get_by_index(net, cfg->fc_ifindex);
1408 idev = in6_dev_get(dev);
1413 if (cfg->fc_metric == 0)
1414 cfg->fc_metric = IP6_RT_PRIO_USER;
1417 if (cfg->fc_nlinfo.nlh &&
1418 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
1419 table = fib6_get_table(net, cfg->fc_table);
1421 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1422 table = fib6_new_table(net, cfg->fc_table);
1425 table = fib6_new_table(net, cfg->fc_table);
1431 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
1438 if (cfg->fc_flags & RTF_EXPIRES)
1439 rt6_set_expires(rt, jiffies +
1440 clock_t_to_jiffies(cfg->fc_expires));
1442 rt6_clean_expires(rt);
1444 if (cfg->fc_protocol == RTPROT_UNSPEC)
1445 cfg->fc_protocol = RTPROT_BOOT;
1446 rt->rt6i_protocol = cfg->fc_protocol;
1448 addr_type = ipv6_addr_type(&cfg->fc_dst);
1450 if (addr_type & IPV6_ADDR_MULTICAST)
1451 rt->dst.input = ip6_mc_input;
1452 else if (cfg->fc_flags & RTF_LOCAL)
1453 rt->dst.input = ip6_input;
1455 rt->dst.input = ip6_forward;
1457 rt->dst.output = ip6_output;
1459 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1460 rt->rt6i_dst.plen = cfg->fc_dst_len;
1461 if (rt->rt6i_dst.plen == 128)
1462 rt->dst.flags |= DST_HOST;
1464 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) {
1465 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
1470 dst_init_metrics(&rt->dst, metrics, 0);
1472 #ifdef CONFIG_IPV6_SUBTREES
1473 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1474 rt->rt6i_src.plen = cfg->fc_src_len;
1477 rt->rt6i_metric = cfg->fc_metric;
1479 /* We cannot add true routes via loopback here,
1480 they would result in kernel looping; promote them to reject routes
1482 if ((cfg->fc_flags & RTF_REJECT) ||
1483 (dev && (dev->flags & IFF_LOOPBACK) &&
1484 !(addr_type & IPV6_ADDR_LOOPBACK) &&
1485 !(cfg->fc_flags & RTF_LOCAL))) {
1486 /* hold loopback dev/idev if we haven't done so. */
1487 if (dev != net->loopback_dev) {
1492 dev = net->loopback_dev;
1494 idev = in6_dev_get(dev);
1500 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1501 switch (cfg->fc_type) {
1503 rt->dst.error = -EINVAL;
1504 rt->dst.output = dst_discard;
1505 rt->dst.input = dst_discard;
1508 rt->dst.error = -EACCES;
1509 rt->dst.output = ip6_pkt_prohibit_out;
1510 rt->dst.input = ip6_pkt_prohibit;
1514 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
1516 rt->dst.output = ip6_pkt_discard_out;
1517 rt->dst.input = ip6_pkt_discard;
1523 if (cfg->fc_flags & RTF_GATEWAY) {
1524 const struct in6_addr *gw_addr;
1527 gw_addr = &cfg->fc_gateway;
1528 rt->rt6i_gateway = *gw_addr;
1529 gwa_type = ipv6_addr_type(gw_addr);
1531 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1532 struct rt6_info *grt;
1534 /* IPv6 strictly inhibits using not link-local
1535 addresses as nexthop address.
1536 Otherwise, router will not able to send redirects.
1537 It is very good, but in some (rare!) circumstances
1538 (SIT, PtP, NBMA NOARP links) it is handy to allow
1539 some exceptions. --ANK
1542 if (!(gwa_type & IPV6_ADDR_UNICAST))
1545 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
1547 err = -EHOSTUNREACH;
1551 if (dev != grt->dst.dev) {
1557 idev = grt->rt6i_idev;
1559 in6_dev_hold(grt->rt6i_idev);
1561 if (!(grt->rt6i_flags & RTF_GATEWAY))
1569 if (!dev || (dev->flags & IFF_LOOPBACK))
1577 if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
1578 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
1582 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
1583 rt->rt6i_prefsrc.plen = 128;
1585 rt->rt6i_prefsrc.plen = 0;
1587 rt->rt6i_flags = cfg->fc_flags;
1594 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1595 int type = nla_type(nla);
1598 if (type > RTAX_MAX) {
1603 dst_metric_set(&rt->dst, type, nla_get_u32(nla));
1609 rt->rt6i_idev = idev;
1610 rt->rt6i_table = table;
1612 cfg->fc_nlinfo.nl_net = dev_net(dev);
1614 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1626 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1629 struct fib6_table *table;
1630 struct net *net = dev_net(rt->dst.dev);
1632 if (rt == net->ipv6.ip6_null_entry) {
1637 table = rt->rt6i_table;
1638 write_lock_bh(&table->tb6_lock);
1639 err = fib6_del(rt, info);
1640 write_unlock_bh(&table->tb6_lock);
1647 int ip6_del_rt(struct rt6_info *rt)
1649 struct nl_info info = {
1650 .nl_net = dev_net(rt->dst.dev),
1652 return __ip6_del_rt(rt, &info);
1655 static int ip6_route_del(struct fib6_config *cfg)
1657 struct fib6_table *table;
1658 struct fib6_node *fn;
1659 struct rt6_info *rt;
1662 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
1666 read_lock_bh(&table->tb6_lock);
1668 fn = fib6_locate(&table->tb6_root,
1669 &cfg->fc_dst, cfg->fc_dst_len,
1670 &cfg->fc_src, cfg->fc_src_len);
1673 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1674 if (cfg->fc_ifindex &&
1676 rt->dst.dev->ifindex != cfg->fc_ifindex))
1678 if (cfg->fc_flags & RTF_GATEWAY &&
1679 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1681 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1684 read_unlock_bh(&table->tb6_lock);
1686 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1689 read_unlock_bh(&table->tb6_lock);
1694 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
1696 struct net *net = dev_net(skb->dev);
1697 struct netevent_redirect netevent;
1698 struct rt6_info *rt, *nrt = NULL;
1699 struct ndisc_options ndopts;
1700 struct inet6_dev *in6_dev;
1701 struct neighbour *neigh;
1703 int optlen, on_link;
1706 optlen = skb->tail - skb->transport_header;
1707 optlen -= sizeof(*msg);
1710 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1714 msg = (struct rd_msg *)icmp6_hdr(skb);
1716 if (ipv6_addr_is_multicast(&msg->dest)) {
1717 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1722 if (ipv6_addr_equal(&msg->dest, &msg->target)) {
1724 } else if (ipv6_addr_type(&msg->target) !=
1725 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1726 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1730 in6_dev = __in6_dev_get(skb->dev);
1733 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1737 * The IP source address of the Redirect MUST be the same as the current
1738 * first-hop router for the specified ICMP Destination Address.
1741 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) {
1742 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1747 if (ndopts.nd_opts_tgt_lladdr) {
1748 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1751 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1756 rt = (struct rt6_info *) dst;
1757 if (rt == net->ipv6.ip6_null_entry) {
1758 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1762 /* Redirect received -> path was valid.
1763 * Look, redirects are sent only in response to data packets,
1764 * so that this nexthop apparently is reachable. --ANK
1766 dst_confirm(&rt->dst);
1768 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
1773 * We have finally decided to accept it.
1776 neigh_update(neigh, lladdr, NUD_STALE,
1777 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1778 NEIGH_UPDATE_F_OVERRIDE|
1779 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1780 NEIGH_UPDATE_F_ISROUTER))
1783 nrt = ip6_rt_copy(rt, &msg->dest);
1787 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1789 nrt->rt6i_flags &= ~RTF_GATEWAY;
1791 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
1793 if (ip6_ins_rt(nrt))
1796 netevent.old = &rt->dst;
1797 netevent.new = &nrt->dst;
1798 netevent.daddr = &msg->dest;
1799 netevent.neigh = neigh;
1800 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1802 if (rt->rt6i_flags & RTF_CACHE) {
1803 rt = (struct rt6_info *) dst_clone(&rt->dst);
1808 neigh_release(neigh);
1812 * Misc support functions
1815 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort,
1816 const struct in6_addr *dest)
1818 struct net *net = dev_net(ort->dst.dev);
1819 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0,
1823 rt->dst.input = ort->dst.input;
1824 rt->dst.output = ort->dst.output;
1825 rt->dst.flags |= DST_HOST;
1827 rt->rt6i_dst.addr = *dest;
1828 rt->rt6i_dst.plen = 128;
1829 dst_copy_metrics(&rt->dst, &ort->dst);
1830 rt->dst.error = ort->dst.error;
1831 rt->rt6i_idev = ort->rt6i_idev;
1833 in6_dev_hold(rt->rt6i_idev);
1834 rt->dst.lastuse = jiffies;
1836 if (ort->rt6i_flags & RTF_GATEWAY)
1837 rt->rt6i_gateway = ort->rt6i_gateway;
1839 rt->rt6i_gateway = *dest;
1840 rt->rt6i_flags = ort->rt6i_flags;
1841 rt6_set_from(rt, ort);
1842 rt->rt6i_metric = 0;
1844 #ifdef CONFIG_IPV6_SUBTREES
1845 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1847 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key));
1848 rt->rt6i_table = ort->rt6i_table;
1853 #ifdef CONFIG_IPV6_ROUTE_INFO
1854 static struct rt6_info *rt6_get_route_info(struct net *net,
1855 const struct in6_addr *prefix, int prefixlen,
1856 const struct in6_addr *gwaddr, int ifindex)
1858 struct fib6_node *fn;
1859 struct rt6_info *rt = NULL;
1860 struct fib6_table *table;
1862 table = fib6_get_table(net, RT6_TABLE_INFO);
1866 read_lock_bh(&table->tb6_lock);
1867 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1871 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1872 if (rt->dst.dev->ifindex != ifindex)
1874 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1876 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1882 read_unlock_bh(&table->tb6_lock);
1886 static struct rt6_info *rt6_add_route_info(struct net *net,
1887 const struct in6_addr *prefix, int prefixlen,
1888 const struct in6_addr *gwaddr, int ifindex,
1891 struct fib6_config cfg = {
1892 .fc_table = RT6_TABLE_INFO,
1893 .fc_metric = IP6_RT_PRIO_USER,
1894 .fc_ifindex = ifindex,
1895 .fc_dst_len = prefixlen,
1896 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1897 RTF_UP | RTF_PREF(pref),
1898 .fc_nlinfo.portid = 0,
1899 .fc_nlinfo.nlh = NULL,
1900 .fc_nlinfo.nl_net = net,
1903 cfg.fc_dst = *prefix;
1904 cfg.fc_gateway = *gwaddr;
1906 /* We should treat it as a default route if prefix length is 0. */
1908 cfg.fc_flags |= RTF_DEFAULT;
1910 ip6_route_add(&cfg);
1912 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1916 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
1918 struct rt6_info *rt;
1919 struct fib6_table *table;
1921 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT);
1925 read_lock_bh(&table->tb6_lock);
1926 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) {
1927 if (dev == rt->dst.dev &&
1928 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1929 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1934 read_unlock_bh(&table->tb6_lock);
1938 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
1939 struct net_device *dev,
1942 struct fib6_config cfg = {
1943 .fc_table = RT6_TABLE_DFLT,
1944 .fc_metric = IP6_RT_PRIO_USER,
1945 .fc_ifindex = dev->ifindex,
1946 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1947 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1948 .fc_nlinfo.portid = 0,
1949 .fc_nlinfo.nlh = NULL,
1950 .fc_nlinfo.nl_net = dev_net(dev),
1953 cfg.fc_gateway = *gwaddr;
1955 ip6_route_add(&cfg);
1957 return rt6_get_dflt_router(gwaddr, dev);
1960 void rt6_purge_dflt_routers(struct net *net)
1962 struct rt6_info *rt;
1963 struct fib6_table *table;
1965 /* NOTE: Keep consistent with rt6_get_dflt_router */
1966 table = fib6_get_table(net, RT6_TABLE_DFLT);
1971 read_lock_bh(&table->tb6_lock);
1972 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
1973 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
1974 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
1976 read_unlock_bh(&table->tb6_lock);
1981 read_unlock_bh(&table->tb6_lock);
1984 static void rtmsg_to_fib6_config(struct net *net,
1985 struct in6_rtmsg *rtmsg,
1986 struct fib6_config *cfg)
1988 memset(cfg, 0, sizeof(*cfg));
1990 cfg->fc_table = RT6_TABLE_MAIN;
1991 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1992 cfg->fc_metric = rtmsg->rtmsg_metric;
1993 cfg->fc_expires = rtmsg->rtmsg_info;
1994 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1995 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1996 cfg->fc_flags = rtmsg->rtmsg_flags;
1998 cfg->fc_nlinfo.nl_net = net;
2000 cfg->fc_dst = rtmsg->rtmsg_dst;
2001 cfg->fc_src = rtmsg->rtmsg_src;
2002 cfg->fc_gateway = rtmsg->rtmsg_gateway;
2005 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
2007 struct fib6_config cfg;
2008 struct in6_rtmsg rtmsg;
2012 case SIOCADDRT: /* Add a route */
2013 case SIOCDELRT: /* Delete a route */
2014 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2016 err = copy_from_user(&rtmsg, arg,
2017 sizeof(struct in6_rtmsg));
2021 rtmsg_to_fib6_config(net, &rtmsg, &cfg);
2026 err = ip6_route_add(&cfg);
2029 err = ip6_route_del(&cfg);
2043 * Drop the packet on the floor
2046 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
2049 struct dst_entry *dst = skb_dst(skb);
2050 switch (ipstats_mib_noroutes) {
2051 case IPSTATS_MIB_INNOROUTES:
2052 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
2053 if (type == IPV6_ADDR_ANY) {
2054 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2055 IPSTATS_MIB_INADDRERRORS);
2059 case IPSTATS_MIB_OUTNOROUTES:
2060 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
2061 ipstats_mib_noroutes);
2064 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
2069 static int ip6_pkt_discard(struct sk_buff *skb)
2071 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
2074 static int ip6_pkt_discard_out(struct sk_buff *skb)
2076 skb->dev = skb_dst(skb)->dev;
2077 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
2080 static int ip6_pkt_prohibit(struct sk_buff *skb)
2082 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
2085 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
2087 skb->dev = skb_dst(skb)->dev;
2088 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
2092 * Allocate a dst for local (unicast / anycast) address.
2095 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
2096 const struct in6_addr *addr,
2099 struct net *net = dev_net(idev->dev);
2100 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
2103 return ERR_PTR(-ENOMEM);
2107 rt->dst.flags |= DST_HOST;
2108 rt->dst.input = ip6_input;
2109 rt->dst.output = ip6_output;
2110 rt->rt6i_idev = idev;
2112 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
2114 rt->rt6i_flags |= RTF_ANYCAST;
2116 rt->rt6i_flags |= RTF_LOCAL;
2118 rt->rt6i_gateway = *addr;
2119 rt->rt6i_dst.addr = *addr;
2120 rt->rt6i_dst.plen = 128;
2121 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL);
2123 atomic_set(&rt->dst.__refcnt, 1);
2128 int ip6_route_get_saddr(struct net *net,
2129 struct rt6_info *rt,
2130 const struct in6_addr *daddr,
2132 struct in6_addr *saddr)
2134 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt);
2136 if (rt->rt6i_prefsrc.plen)
2137 *saddr = rt->rt6i_prefsrc.addr;
2139 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
2140 daddr, prefs, saddr);
2144 /* remove deleted ip from prefsrc entries */
2145 struct arg_dev_net_ip {
2146 struct net_device *dev;
2148 struct in6_addr *addr;
2151 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
2153 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
2154 struct net *net = ((struct arg_dev_net_ip *)arg)->net;
2155 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
2157 if (((void *)rt->dst.dev == dev || !dev) &&
2158 rt != net->ipv6.ip6_null_entry &&
2159 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
2160 /* remove prefsrc entry */
2161 rt->rt6i_prefsrc.plen = 0;
2166 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
2168 struct net *net = dev_net(ifp->idev->dev);
2169 struct arg_dev_net_ip adni = {
2170 .dev = ifp->idev->dev,
2174 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni);
2177 struct arg_dev_net {
2178 struct net_device *dev;
2182 static int fib6_ifdown(struct rt6_info *rt, void *arg)
2184 const struct arg_dev_net *adn = arg;
2185 const struct net_device *dev = adn->dev;
2187 if ((rt->dst.dev == dev || !dev) &&
2188 rt != adn->net->ipv6.ip6_null_entry)
2194 void rt6_ifdown(struct net *net, struct net_device *dev)
2196 struct arg_dev_net adn = {
2201 fib6_clean_all(net, fib6_ifdown, 0, &adn);
2202 icmp6_clean_all(fib6_ifdown, &adn);
2205 struct rt6_mtu_change_arg {
2206 struct net_device *dev;
2210 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
2212 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
2213 struct inet6_dev *idev;
2215 /* In IPv6 pmtu discovery is not optional,
2216 so that RTAX_MTU lock cannot disable it.
2217 We still use this lock to block changes
2218 caused by addrconf/ndisc.
2221 idev = __in6_dev_get(arg->dev);
2225 /* For administrative MTU increase, there is no way to discover
2226 IPv6 PMTU increase, so PMTU increase should be updated here.
2227 Since RFC 1981 doesn't include administrative MTU increase
2228 update PMTU increase is a MUST. (i.e. jumbo frame)
2231 If new MTU is less than route PMTU, this new MTU will be the
2232 lowest MTU in the path, update the route PMTU to reflect PMTU
2233 decreases; if new MTU is greater than route PMTU, and the
2234 old MTU is the lowest MTU in the path, update the route PMTU
2235 to reflect the increase. In this case if the other nodes' MTU
2236 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2239 if (rt->dst.dev == arg->dev &&
2240 !dst_metric_locked(&rt->dst, RTAX_MTU) &&
2241 (dst_mtu(&rt->dst) >= arg->mtu ||
2242 (dst_mtu(&rt->dst) < arg->mtu &&
2243 dst_mtu(&rt->dst) == idev->cnf.mtu6))) {
2244 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
2249 void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
2251 struct rt6_mtu_change_arg arg = {
2256 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg);
2259 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
2260 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
2261 [RTA_OIF] = { .type = NLA_U32 },
2262 [RTA_IIF] = { .type = NLA_U32 },
2263 [RTA_PRIORITY] = { .type = NLA_U32 },
2264 [RTA_METRICS] = { .type = NLA_NESTED },
2265 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
2268 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
2269 struct fib6_config *cfg)
2272 struct nlattr *tb[RTA_MAX+1];
2275 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2280 rtm = nlmsg_data(nlh);
2281 memset(cfg, 0, sizeof(*cfg));
2283 cfg->fc_table = rtm->rtm_table;
2284 cfg->fc_dst_len = rtm->rtm_dst_len;
2285 cfg->fc_src_len = rtm->rtm_src_len;
2286 cfg->fc_flags = RTF_UP;
2287 cfg->fc_protocol = rtm->rtm_protocol;
2288 cfg->fc_type = rtm->rtm_type;
2290 if (rtm->rtm_type == RTN_UNREACHABLE ||
2291 rtm->rtm_type == RTN_BLACKHOLE ||
2292 rtm->rtm_type == RTN_PROHIBIT ||
2293 rtm->rtm_type == RTN_THROW)
2294 cfg->fc_flags |= RTF_REJECT;
2296 if (rtm->rtm_type == RTN_LOCAL)
2297 cfg->fc_flags |= RTF_LOCAL;
2299 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
2300 cfg->fc_nlinfo.nlh = nlh;
2301 cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
2303 if (tb[RTA_GATEWAY]) {
2304 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
2305 cfg->fc_flags |= RTF_GATEWAY;
2309 int plen = (rtm->rtm_dst_len + 7) >> 3;
2311 if (nla_len(tb[RTA_DST]) < plen)
2314 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
2318 int plen = (rtm->rtm_src_len + 7) >> 3;
2320 if (nla_len(tb[RTA_SRC]) < plen)
2323 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2326 if (tb[RTA_PREFSRC])
2327 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16);
2330 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2332 if (tb[RTA_PRIORITY])
2333 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2335 if (tb[RTA_METRICS]) {
2336 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2337 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2341 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2343 if (tb[RTA_MULTIPATH]) {
2344 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
2345 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
2353 static int ip6_route_multipath(struct fib6_config *cfg, int add)
2355 struct fib6_config r_cfg;
2356 struct rtnexthop *rtnh;
2359 int err = 0, last_err = 0;
2362 rtnh = (struct rtnexthop *)cfg->fc_mp;
2363 remaining = cfg->fc_mp_len;
2365 /* Parse a Multipath Entry */
2366 while (rtnh_ok(rtnh, remaining)) {
2367 memcpy(&r_cfg, cfg, sizeof(*cfg));
2368 if (rtnh->rtnh_ifindex)
2369 r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
2371 attrlen = rtnh_attrlen(rtnh);
2373 struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
2375 nla = nla_find(attrs, attrlen, RTA_GATEWAY);
2377 nla_memcpy(&r_cfg.fc_gateway, nla, 16);
2378 r_cfg.fc_flags |= RTF_GATEWAY;
2381 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg);
2384 /* If we are trying to remove a route, do not stop the
2385 * loop when ip6_route_del() fails (because next hop is
2386 * already gone), we should try to remove all next hops.
2389 /* If add fails, we should try to delete all
2390 * next hops that have been already added.
2396 /* Because each route is added like a single route we remove
2397 * this flag after the first nexthop (if there is a collision,
2398 * we have already fail to add the first nexthop:
2399 * fib6_add_rt2node() has reject it).
2401 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL;
2402 rtnh = rtnh_next(rtnh, &remaining);
2408 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2410 struct fib6_config cfg;
2413 err = rtm_to_fib6_config(skb, nlh, &cfg);
2418 return ip6_route_multipath(&cfg, 0);
2420 return ip6_route_del(&cfg);
2423 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh)
2425 struct fib6_config cfg;
2428 err = rtm_to_fib6_config(skb, nlh, &cfg);
2433 return ip6_route_multipath(&cfg, 1);
2435 return ip6_route_add(&cfg);
2438 static inline size_t rt6_nlmsg_size(void)
2440 return NLMSG_ALIGN(sizeof(struct rtmsg))
2441 + nla_total_size(16) /* RTA_SRC */
2442 + nla_total_size(16) /* RTA_DST */
2443 + nla_total_size(16) /* RTA_GATEWAY */
2444 + nla_total_size(16) /* RTA_PREFSRC */
2445 + nla_total_size(4) /* RTA_TABLE */
2446 + nla_total_size(4) /* RTA_IIF */
2447 + nla_total_size(4) /* RTA_OIF */
2448 + nla_total_size(4) /* RTA_PRIORITY */
2449 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2450 + nla_total_size(sizeof(struct rta_cacheinfo));
2453 static int rt6_fill_node(struct net *net,
2454 struct sk_buff *skb, struct rt6_info *rt,
2455 struct in6_addr *dst, struct in6_addr *src,
2456 int iif, int type, u32 portid, u32 seq,
2457 int prefix, int nowait, unsigned int flags)
2460 struct nlmsghdr *nlh;
2464 if (prefix) { /* user wants prefix routes only */
2465 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2466 /* success since this is not a prefix route */
2471 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
2475 rtm = nlmsg_data(nlh);
2476 rtm->rtm_family = AF_INET6;
2477 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2478 rtm->rtm_src_len = rt->rt6i_src.plen;
2481 table = rt->rt6i_table->tb6_id;
2483 table = RT6_TABLE_UNSPEC;
2484 rtm->rtm_table = table;
2485 if (nla_put_u32(skb, RTA_TABLE, table))
2486 goto nla_put_failure;
2487 if (rt->rt6i_flags & RTF_REJECT) {
2488 switch (rt->dst.error) {
2490 rtm->rtm_type = RTN_BLACKHOLE;
2493 rtm->rtm_type = RTN_PROHIBIT;
2496 rtm->rtm_type = RTN_THROW;
2499 rtm->rtm_type = RTN_UNREACHABLE;
2503 else if (rt->rt6i_flags & RTF_LOCAL)
2504 rtm->rtm_type = RTN_LOCAL;
2505 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
2506 rtm->rtm_type = RTN_LOCAL;
2508 rtm->rtm_type = RTN_UNICAST;
2510 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2511 rtm->rtm_protocol = rt->rt6i_protocol;
2512 if (rt->rt6i_flags & RTF_DYNAMIC)
2513 rtm->rtm_protocol = RTPROT_REDIRECT;
2514 else if (rt->rt6i_flags & RTF_ADDRCONF) {
2515 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
2516 rtm->rtm_protocol = RTPROT_RA;
2518 rtm->rtm_protocol = RTPROT_KERNEL;
2521 if (rt->rt6i_flags & RTF_CACHE)
2522 rtm->rtm_flags |= RTM_F_CLONED;
2525 if (nla_put(skb, RTA_DST, 16, dst))
2526 goto nla_put_failure;
2527 rtm->rtm_dst_len = 128;
2528 } else if (rtm->rtm_dst_len)
2529 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr))
2530 goto nla_put_failure;
2531 #ifdef CONFIG_IPV6_SUBTREES
2533 if (nla_put(skb, RTA_SRC, 16, src))
2534 goto nla_put_failure;
2535 rtm->rtm_src_len = 128;
2536 } else if (rtm->rtm_src_len &&
2537 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr))
2538 goto nla_put_failure;
2541 #ifdef CONFIG_IPV6_MROUTE
2542 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
2543 int err = ip6mr_get_route(net, skb, rtm, nowait);
2548 goto nla_put_failure;
2550 if (err == -EMSGSIZE)
2551 goto nla_put_failure;
2556 if (nla_put_u32(skb, RTA_IIF, iif))
2557 goto nla_put_failure;
2559 struct in6_addr saddr_buf;
2560 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
2561 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2562 goto nla_put_failure;
2565 if (rt->rt6i_prefsrc.plen) {
2566 struct in6_addr saddr_buf;
2567 saddr_buf = rt->rt6i_prefsrc.addr;
2568 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf))
2569 goto nla_put_failure;
2572 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0)
2573 goto nla_put_failure;
2575 if (rt->rt6i_flags & RTF_GATEWAY) {
2576 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0)
2577 goto nla_put_failure;
2581 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
2582 goto nla_put_failure;
2583 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
2584 goto nla_put_failure;
2586 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
2588 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
2589 goto nla_put_failure;
2591 return nlmsg_end(skb, nlh);
2594 nlmsg_cancel(skb, nlh);
2598 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2600 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2603 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2604 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2605 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2609 return rt6_fill_node(arg->net,
2610 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2611 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
2612 prefix, 0, NLM_F_MULTI);
2615 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh)
2617 struct net *net = sock_net(in_skb->sk);
2618 struct nlattr *tb[RTA_MAX+1];
2619 struct rt6_info *rt;
2620 struct sk_buff *skb;
2623 int err, iif = 0, oif = 0;
2625 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2630 memset(&fl6, 0, sizeof(fl6));
2633 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2636 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
2640 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2643 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
2647 iif = nla_get_u32(tb[RTA_IIF]);
2650 oif = nla_get_u32(tb[RTA_OIF]);
2653 struct net_device *dev;
2656 dev = __dev_get_by_index(net, iif);
2662 fl6.flowi6_iif = iif;
2664 if (!ipv6_addr_any(&fl6.saddr))
2665 flags |= RT6_LOOKUP_F_HAS_SADDR;
2667 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
2670 fl6.flowi6_oif = oif;
2672 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
2675 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2682 /* Reserve room for dummy headers, this skb can pass
2683 through good chunk of routing engine.
2685 skb_reset_mac_header(skb);
2686 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2688 skb_dst_set(skb, &rt->dst);
2690 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
2691 RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
2692 nlh->nlmsg_seq, 0, 0, 0);
2698 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
2703 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2705 struct sk_buff *skb;
2706 struct net *net = info->nl_net;
2711 seq = info->nlh ? info->nlh->nlmsg_seq : 0;
2713 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2717 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
2718 event, info->portid, seq, 0, 0, 0);
2720 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2721 WARN_ON(err == -EMSGSIZE);
2725 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
2726 info->nlh, gfp_any());
2730 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
2733 static int ip6_route_dev_notify(struct notifier_block *this,
2734 unsigned long event, void *data)
2736 struct net_device *dev = (struct net_device *)data;
2737 struct net *net = dev_net(dev);
2739 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
2740 net->ipv6.ip6_null_entry->dst.dev = dev;
2741 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
2742 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2743 net->ipv6.ip6_prohibit_entry->dst.dev = dev;
2744 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
2745 net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
2746 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
2757 #ifdef CONFIG_PROC_FS
2768 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2770 struct seq_file *m = p_arg;
2772 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen);
2774 #ifdef CONFIG_IPV6_SUBTREES
2775 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen);
2777 seq_puts(m, "00000000000000000000000000000000 00 ");
2779 if (rt->rt6i_flags & RTF_GATEWAY) {
2780 seq_printf(m, "%pi6", &rt->rt6i_gateway);
2782 seq_puts(m, "00000000000000000000000000000000");
2784 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2785 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt),
2786 rt->dst.__use, rt->rt6i_flags,
2787 rt->dst.dev ? rt->dst.dev->name : "");
2791 static int ipv6_route_show(struct seq_file *m, void *v)
2793 struct net *net = (struct net *)m->private;
2794 fib6_clean_all_ro(net, rt6_info_route, 0, m);
2798 static int ipv6_route_open(struct inode *inode, struct file *file)
2800 return single_open_net(inode, file, ipv6_route_show);
2803 static const struct file_operations ipv6_route_proc_fops = {
2804 .owner = THIS_MODULE,
2805 .open = ipv6_route_open,
2807 .llseek = seq_lseek,
2808 .release = single_release_net,
2811 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2813 struct net *net = (struct net *)seq->private;
2814 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2815 net->ipv6.rt6_stats->fib_nodes,
2816 net->ipv6.rt6_stats->fib_route_nodes,
2817 net->ipv6.rt6_stats->fib_rt_alloc,
2818 net->ipv6.rt6_stats->fib_rt_entries,
2819 net->ipv6.rt6_stats->fib_rt_cache,
2820 dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
2821 net->ipv6.rt6_stats->fib_discarded_routes);
2826 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2828 return single_open_net(inode, file, rt6_stats_seq_show);
2831 static const struct file_operations rt6_stats_seq_fops = {
2832 .owner = THIS_MODULE,
2833 .open = rt6_stats_seq_open,
2835 .llseek = seq_lseek,
2836 .release = single_release_net,
2838 #endif /* CONFIG_PROC_FS */
2840 #ifdef CONFIG_SYSCTL
2843 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write,
2844 void __user *buffer, size_t *lenp, loff_t *ppos)
2851 net = (struct net *)ctl->extra1;
2852 delay = net->ipv6.sysctl.flush_delay;
2853 proc_dointvec(ctl, write, buffer, lenp, ppos);
2854 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2858 ctl_table ipv6_route_table_template[] = {
2860 .procname = "flush",
2861 .data = &init_net.ipv6.sysctl.flush_delay,
2862 .maxlen = sizeof(int),
2864 .proc_handler = ipv6_sysctl_rtcache_flush
2867 .procname = "gc_thresh",
2868 .data = &ip6_dst_ops_template.gc_thresh,
2869 .maxlen = sizeof(int),
2871 .proc_handler = proc_dointvec,
2874 .procname = "max_size",
2875 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2876 .maxlen = sizeof(int),
2878 .proc_handler = proc_dointvec,
2881 .procname = "gc_min_interval",
2882 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2883 .maxlen = sizeof(int),
2885 .proc_handler = proc_dointvec_jiffies,
2888 .procname = "gc_timeout",
2889 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2890 .maxlen = sizeof(int),
2892 .proc_handler = proc_dointvec_jiffies,
2895 .procname = "gc_interval",
2896 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2897 .maxlen = sizeof(int),
2899 .proc_handler = proc_dointvec_jiffies,
2902 .procname = "gc_elasticity",
2903 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2904 .maxlen = sizeof(int),
2906 .proc_handler = proc_dointvec,
2909 .procname = "mtu_expires",
2910 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2911 .maxlen = sizeof(int),
2913 .proc_handler = proc_dointvec_jiffies,
2916 .procname = "min_adv_mss",
2917 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2918 .maxlen = sizeof(int),
2920 .proc_handler = proc_dointvec,
2923 .procname = "gc_min_interval_ms",
2924 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2925 .maxlen = sizeof(int),
2927 .proc_handler = proc_dointvec_ms_jiffies,
2932 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
2934 struct ctl_table *table;
2936 table = kmemdup(ipv6_route_table_template,
2937 sizeof(ipv6_route_table_template),
2941 table[0].data = &net->ipv6.sysctl.flush_delay;
2942 table[0].extra1 = net;
2943 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
2944 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2945 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2946 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2947 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2948 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2949 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2950 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2951 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2953 /* Don't export sysctls to unprivileged users */
2954 if (net->user_ns != &init_user_ns)
2955 table[0].procname = NULL;
2962 static int __net_init ip6_route_net_init(struct net *net)
2966 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
2967 sizeof(net->ipv6.ip6_dst_ops));
2969 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
2970 goto out_ip6_dst_ops;
2972 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
2973 sizeof(*net->ipv6.ip6_null_entry),
2975 if (!net->ipv6.ip6_null_entry)
2976 goto out_ip6_dst_entries;
2977 net->ipv6.ip6_null_entry->dst.path =
2978 (struct dst_entry *)net->ipv6.ip6_null_entry;
2979 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2980 dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
2981 ip6_template_metrics, true);
2983 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2984 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
2985 sizeof(*net->ipv6.ip6_prohibit_entry),
2987 if (!net->ipv6.ip6_prohibit_entry)
2988 goto out_ip6_null_entry;
2989 net->ipv6.ip6_prohibit_entry->dst.path =
2990 (struct dst_entry *)net->ipv6.ip6_prohibit_entry;
2991 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
2992 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
2993 ip6_template_metrics, true);
2995 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
2996 sizeof(*net->ipv6.ip6_blk_hole_entry),
2998 if (!net->ipv6.ip6_blk_hole_entry)
2999 goto out_ip6_prohibit_entry;
3000 net->ipv6.ip6_blk_hole_entry->dst.path =
3001 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
3002 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
3003 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
3004 ip6_template_metrics, true);
3007 net->ipv6.sysctl.flush_delay = 0;
3008 net->ipv6.sysctl.ip6_rt_max_size = 4096;
3009 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
3010 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
3011 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
3012 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
3013 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
3014 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
3016 net->ipv6.ip6_rt_gc_expire = 30*HZ;
3022 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3023 out_ip6_prohibit_entry:
3024 kfree(net->ipv6.ip6_prohibit_entry);
3026 kfree(net->ipv6.ip6_null_entry);
3028 out_ip6_dst_entries:
3029 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3034 static void __net_exit ip6_route_net_exit(struct net *net)
3036 kfree(net->ipv6.ip6_null_entry);
3037 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3038 kfree(net->ipv6.ip6_prohibit_entry);
3039 kfree(net->ipv6.ip6_blk_hole_entry);
3041 dst_entries_destroy(&net->ipv6.ip6_dst_ops);
3044 static int __net_init ip6_route_net_init_late(struct net *net)
3046 #ifdef CONFIG_PROC_FS
3047 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
3048 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
3053 static void __net_exit ip6_route_net_exit_late(struct net *net)
3055 #ifdef CONFIG_PROC_FS
3056 remove_proc_entry("ipv6_route", net->proc_net);
3057 remove_proc_entry("rt6_stats", net->proc_net);
3061 static struct pernet_operations ip6_route_net_ops = {
3062 .init = ip6_route_net_init,
3063 .exit = ip6_route_net_exit,
3066 static int __net_init ipv6_inetpeer_init(struct net *net)
3068 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
3072 inet_peer_base_init(bp);
3073 net->ipv6.peers = bp;
3077 static void __net_exit ipv6_inetpeer_exit(struct net *net)
3079 struct inet_peer_base *bp = net->ipv6.peers;
3081 net->ipv6.peers = NULL;
3082 inetpeer_invalidate_tree(bp);
3086 static struct pernet_operations ipv6_inetpeer_ops = {
3087 .init = ipv6_inetpeer_init,
3088 .exit = ipv6_inetpeer_exit,
3091 static struct pernet_operations ip6_route_net_late_ops = {
3092 .init = ip6_route_net_init_late,
3093 .exit = ip6_route_net_exit_late,
3096 static struct notifier_block ip6_route_dev_notifier = {
3097 .notifier_call = ip6_route_dev_notify,
3101 int __init ip6_route_init(void)
3106 ip6_dst_ops_template.kmem_cachep =
3107 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
3108 SLAB_HWCACHE_ALIGN, NULL);
3109 if (!ip6_dst_ops_template.kmem_cachep)
3112 ret = dst_entries_init(&ip6_dst_blackhole_ops);
3114 goto out_kmem_cache;
3116 ret = register_pernet_subsys(&ipv6_inetpeer_ops);
3118 goto out_dst_entries;
3120 ret = register_pernet_subsys(&ip6_route_net_ops);
3122 goto out_register_inetpeer;
3124 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
3126 /* Registering of the loopback is done before this portion of code,
3127 * the loopback reference in rt6_info will not be taken, do it
3128 * manually for init_net */
3129 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
3130 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3131 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3132 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
3133 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3134 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
3135 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
3139 goto out_register_subsys;
3145 ret = fib6_rules_init();
3149 ret = register_pernet_subsys(&ip6_route_net_late_ops);
3151 goto fib6_rules_init;
3154 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
3155 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
3156 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
3157 goto out_register_late_subsys;
3159 ret = register_netdevice_notifier(&ip6_route_dev_notifier);
3161 goto out_register_late_subsys;
3166 out_register_late_subsys:
3167 unregister_pernet_subsys(&ip6_route_net_late_ops);
3169 fib6_rules_cleanup();
3174 out_register_subsys:
3175 unregister_pernet_subsys(&ip6_route_net_ops);
3176 out_register_inetpeer:
3177 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3179 dst_entries_destroy(&ip6_dst_blackhole_ops);
3181 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
3185 void ip6_route_cleanup(void)
3187 unregister_netdevice_notifier(&ip6_route_dev_notifier);
3188 unregister_pernet_subsys(&ip6_route_net_late_ops);
3189 fib6_rules_cleanup();
3192 unregister_pernet_subsys(&ipv6_inetpeer_ops);
3193 unregister_pernet_subsys(&ip6_route_net_ops);
3194 dst_entries_destroy(&ip6_dst_blackhole_ops);
3195 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);