2 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
18 * YOSHIFUJI Hideaki @USAGI
19 * reworked default router selection.
20 * - respect outgoing interface
21 * - select from (probably) reachable routers (i.e.
22 * routers in REACHABLE, STALE, DELAY or PROBE states).
23 * - always select the same router if it is (probably)
24 * reachable. otherwise, round-robin the list.
26 * Fixed routing subtrees.
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/times.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/net.h>
36 #include <linux/route.h>
37 #include <linux/netdevice.h>
38 #include <linux/in6.h>
39 #include <linux/init.h>
40 #include <linux/if_arp.h>
41 #include <linux/proc_fs.h>
42 #include <linux/seq_file.h>
43 #include <linux/nsproxy.h>
44 #include <net/net_namespace.h>
47 #include <net/ip6_fib.h>
48 #include <net/ip6_route.h>
49 #include <net/ndisc.h>
50 #include <net/addrconf.h>
52 #include <linux/rtnetlink.h>
55 #include <net/netevent.h>
56 #include <net/netlink.h>
58 #include <asm/uaccess.h>
61 #include <linux/sysctl.h>
64 /* Set to 3 to get tracing. */
68 #define RDBG(x) printk x
69 #define RT6_TRACE(x...) printk(KERN_DEBUG x)
72 #define RT6_TRACE(x...) do { ; } while (0)
75 #define CLONE_OFFLINK_ROUTE 0
77 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort);
78 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
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 void ip6_link_failure(struct sk_buff *skb);
88 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
90 #ifdef CONFIG_IPV6_ROUTE_INFO
91 static struct rt6_info *rt6_add_route_info(struct net *net,
92 struct in6_addr *prefix, int prefixlen,
93 struct in6_addr *gwaddr, int ifindex,
95 static struct rt6_info *rt6_get_route_info(struct net *net,
96 struct in6_addr *prefix, int prefixlen,
97 struct in6_addr *gwaddr, int ifindex);
100 static struct dst_ops ip6_dst_ops = {
102 .protocol = __constant_htons(ETH_P_IPV6),
105 .check = ip6_dst_check,
106 .destroy = ip6_dst_destroy,
107 .ifdown = ip6_dst_ifdown,
108 .negative_advice = ip6_negative_advice,
109 .link_failure = ip6_link_failure,
110 .update_pmtu = ip6_rt_update_pmtu,
111 .local_out = ip6_local_out,
112 .entry_size = sizeof(struct rt6_info),
113 .entries = ATOMIC_INIT(0),
116 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu)
120 static struct dst_ops ip6_dst_blackhole_ops = {
122 .protocol = __constant_htons(ETH_P_IPV6),
123 .destroy = ip6_dst_destroy,
124 .check = ip6_dst_check,
125 .update_pmtu = ip6_rt_blackhole_update_pmtu,
126 .entry_size = sizeof(struct rt6_info),
127 .entries = ATOMIC_INIT(0),
130 struct rt6_info ip6_null_entry = {
133 .__refcnt = ATOMIC_INIT(1),
136 .error = -ENETUNREACH,
137 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
138 .input = ip6_pkt_discard,
139 .output = ip6_pkt_discard_out,
141 .path = (struct dst_entry*)&ip6_null_entry,
144 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
145 .rt6i_metric = ~(u32) 0,
146 .rt6i_ref = ATOMIC_INIT(1),
149 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
151 static int ip6_pkt_prohibit(struct sk_buff *skb);
152 static int ip6_pkt_prohibit_out(struct sk_buff *skb);
154 struct rt6_info ip6_prohibit_entry = {
157 .__refcnt = ATOMIC_INIT(1),
161 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
162 .input = ip6_pkt_prohibit,
163 .output = ip6_pkt_prohibit_out,
165 .path = (struct dst_entry*)&ip6_prohibit_entry,
168 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
169 .rt6i_metric = ~(u32) 0,
170 .rt6i_ref = ATOMIC_INIT(1),
173 struct rt6_info ip6_blk_hole_entry = {
176 .__refcnt = ATOMIC_INIT(1),
180 .metrics = { [RTAX_HOPLIMIT - 1] = 255, },
181 .input = dst_discard,
182 .output = dst_discard,
184 .path = (struct dst_entry*)&ip6_blk_hole_entry,
187 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
188 .rt6i_metric = ~(u32) 0,
189 .rt6i_ref = ATOMIC_INIT(1),
194 /* allocate dst with ip6_dst_ops */
195 static __inline__ struct rt6_info *ip6_dst_alloc(void)
197 return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
200 static void ip6_dst_destroy(struct dst_entry *dst)
202 struct rt6_info *rt = (struct rt6_info *)dst;
203 struct inet6_dev *idev = rt->rt6i_idev;
206 rt->rt6i_idev = NULL;
211 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
214 struct rt6_info *rt = (struct rt6_info *)dst;
215 struct inet6_dev *idev = rt->rt6i_idev;
216 struct net_device *loopback_dev =
217 dev->nd_net->loopback_dev;
219 if (dev != loopback_dev && idev != NULL && idev->dev == dev) {
220 struct inet6_dev *loopback_idev =
221 in6_dev_get(loopback_dev);
222 if (loopback_idev != NULL) {
223 rt->rt6i_idev = loopback_idev;
229 static __inline__ int rt6_check_expired(const struct rt6_info *rt)
231 return (rt->rt6i_flags & RTF_EXPIRES &&
232 time_after(jiffies, rt->rt6i_expires));
235 static inline int rt6_need_strict(struct in6_addr *daddr)
237 return (ipv6_addr_type(daddr) &
238 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
242 * Route lookup. Any table->tb6_lock is implied.
245 static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
249 struct rt6_info *local = NULL;
250 struct rt6_info *sprt;
253 for (sprt = rt; sprt; sprt = sprt->u.dst.rt6_next) {
254 struct net_device *dev = sprt->rt6i_dev;
255 if (dev->ifindex == oif)
257 if (dev->flags & IFF_LOOPBACK) {
258 if (sprt->rt6i_idev == NULL ||
259 sprt->rt6i_idev->dev->ifindex != oif) {
262 if (local && (!oif ||
263 local->rt6i_idev->dev->ifindex == oif))
274 return &ip6_null_entry;
279 #ifdef CONFIG_IPV6_ROUTER_PREF
280 static void rt6_probe(struct rt6_info *rt)
282 struct neighbour *neigh = rt ? rt->rt6i_nexthop : NULL;
284 * Okay, this does not seem to be appropriate
285 * for now, however, we need to check if it
286 * is really so; aka Router Reachability Probing.
288 * Router Reachability Probe MUST be rate-limited
289 * to no more than one per minute.
291 if (!neigh || (neigh->nud_state & NUD_VALID))
293 read_lock_bh(&neigh->lock);
294 if (!(neigh->nud_state & NUD_VALID) &&
295 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {
296 struct in6_addr mcaddr;
297 struct in6_addr *target;
299 neigh->updated = jiffies;
300 read_unlock_bh(&neigh->lock);
302 target = (struct in6_addr *)&neigh->primary_key;
303 addrconf_addr_solict_mult(target, &mcaddr);
304 ndisc_send_ns(rt->rt6i_dev, NULL, target, &mcaddr, NULL);
306 read_unlock_bh(&neigh->lock);
309 static inline void rt6_probe(struct rt6_info *rt)
316 * Default Router Selection (RFC 2461 6.3.6)
318 static inline int rt6_check_dev(struct rt6_info *rt, int oif)
320 struct net_device *dev = rt->rt6i_dev;
321 if (!oif || dev->ifindex == oif)
323 if ((dev->flags & IFF_LOOPBACK) &&
324 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
329 static inline int rt6_check_neigh(struct rt6_info *rt)
331 struct neighbour *neigh = rt->rt6i_nexthop;
333 if (rt->rt6i_flags & RTF_NONEXTHOP ||
334 !(rt->rt6i_flags & RTF_GATEWAY))
337 read_lock_bh(&neigh->lock);
338 if (neigh->nud_state & NUD_VALID)
340 #ifdef CONFIG_IPV6_ROUTER_PREF
341 else if (neigh->nud_state & NUD_FAILED)
346 read_unlock_bh(&neigh->lock);
352 static int rt6_score_route(struct rt6_info *rt, int oif,
357 m = rt6_check_dev(rt, oif);
358 if (!m && (strict & RT6_LOOKUP_F_IFACE))
360 #ifdef CONFIG_IPV6_ROUTER_PREF
361 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
363 n = rt6_check_neigh(rt);
364 if (!n && (strict & RT6_LOOKUP_F_REACHABLE))
369 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
370 int *mpri, struct rt6_info *match)
374 if (rt6_check_expired(rt))
377 m = rt6_score_route(rt, oif, strict);
382 if (strict & RT6_LOOKUP_F_REACHABLE)
386 } else if (strict & RT6_LOOKUP_F_REACHABLE) {
394 static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
395 struct rt6_info *rr_head,
396 u32 metric, int oif, int strict)
398 struct rt6_info *rt, *match;
402 for (rt = rr_head; rt && rt->rt6i_metric == metric;
403 rt = rt->u.dst.rt6_next)
404 match = find_match(rt, oif, strict, &mpri, match);
405 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
406 rt = rt->u.dst.rt6_next)
407 match = find_match(rt, oif, strict, &mpri, match);
412 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
414 struct rt6_info *match, *rt0;
416 RT6_TRACE("%s(fn->leaf=%p, oif=%d)\n",
417 __FUNCTION__, fn->leaf, oif);
421 fn->rr_ptr = rt0 = fn->leaf;
423 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict);
426 (strict & RT6_LOOKUP_F_REACHABLE)) {
427 struct rt6_info *next = rt0->u.dst.rt6_next;
429 /* no entries matched; do round-robin */
430 if (!next || next->rt6i_metric != rt0->rt6i_metric)
437 RT6_TRACE("%s() => %p\n",
438 __FUNCTION__, match);
440 return (match ? match : &ip6_null_entry);
443 #ifdef CONFIG_IPV6_ROUTE_INFO
444 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
445 struct in6_addr *gwaddr)
447 struct net *net = dev->nd_net;
448 struct route_info *rinfo = (struct route_info *) opt;
449 struct in6_addr prefix_buf, *prefix;
454 if (len < sizeof(struct route_info)) {
458 /* Sanity check for prefix_len and length */
459 if (rinfo->length > 3) {
461 } else if (rinfo->prefix_len > 128) {
463 } else if (rinfo->prefix_len > 64) {
464 if (rinfo->length < 2) {
467 } else if (rinfo->prefix_len > 0) {
468 if (rinfo->length < 1) {
473 pref = rinfo->route_pref;
474 if (pref == ICMPV6_ROUTER_PREF_INVALID)
475 pref = ICMPV6_ROUTER_PREF_MEDIUM;
477 lifetime = ntohl(rinfo->lifetime);
478 if (lifetime == 0xffffffff) {
480 } else if (lifetime > 0x7fffffff/HZ) {
481 /* Avoid arithmetic overflow */
482 lifetime = 0x7fffffff/HZ - 1;
485 if (rinfo->length == 3)
486 prefix = (struct in6_addr *)rinfo->prefix;
488 /* this function is safe */
489 ipv6_addr_prefix(&prefix_buf,
490 (struct in6_addr *)rinfo->prefix,
492 prefix = &prefix_buf;
495 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr,
498 if (rt && !lifetime) {
504 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex,
507 rt->rt6i_flags = RTF_ROUTEINFO |
508 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
511 if (lifetime == 0xffffffff) {
512 rt->rt6i_flags &= ~RTF_EXPIRES;
514 rt->rt6i_expires = jiffies + HZ * lifetime;
515 rt->rt6i_flags |= RTF_EXPIRES;
517 dst_release(&rt->u.dst);
523 #define BACKTRACK(saddr) \
525 if (rt == &ip6_null_entry) { \
526 struct fib6_node *pn; \
528 if (fn->fn_flags & RTN_TL_ROOT) \
531 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
532 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
535 if (fn->fn_flags & RTN_RTINFO) \
541 static struct rt6_info *ip6_pol_route_lookup(struct fib6_table *table,
542 struct flowi *fl, int flags)
544 struct fib6_node *fn;
547 read_lock_bh(&table->tb6_lock);
548 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
551 rt = rt6_device_match(rt, fl->oif, flags);
552 BACKTRACK(&fl->fl6_src);
554 dst_use(&rt->u.dst, jiffies);
555 read_unlock_bh(&table->tb6_lock);
560 struct rt6_info *rt6_lookup(struct net *net, struct in6_addr *daddr,
561 struct in6_addr *saddr, int oif, int strict)
571 struct dst_entry *dst;
572 int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
575 memcpy(&fl.fl6_src, saddr, sizeof(*saddr));
576 flags |= RT6_LOOKUP_F_HAS_SADDR;
579 dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_lookup);
581 return (struct rt6_info *) dst;
588 EXPORT_SYMBOL(rt6_lookup);
590 /* ip6_ins_rt is called with FREE table->tb6_lock.
591 It takes new route entry, the addition fails by any reason the
592 route is freed. In any case, if caller does not hold it, it may
596 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info)
599 struct fib6_table *table;
601 table = rt->rt6i_table;
602 write_lock_bh(&table->tb6_lock);
603 err = fib6_add(&table->tb6_root, rt, info);
604 write_unlock_bh(&table->tb6_lock);
609 int ip6_ins_rt(struct rt6_info *rt)
611 struct nl_info info = {
614 return __ip6_ins_rt(rt, &info);
617 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr,
618 struct in6_addr *saddr)
626 rt = ip6_rt_copy(ort);
629 if (!(rt->rt6i_flags&RTF_GATEWAY)) {
630 if (rt->rt6i_dst.plen != 128 &&
631 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr))
632 rt->rt6i_flags |= RTF_ANYCAST;
633 ipv6_addr_copy(&rt->rt6i_gateway, daddr);
636 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
637 rt->rt6i_dst.plen = 128;
638 rt->rt6i_flags |= RTF_CACHE;
639 rt->u.dst.flags |= DST_HOST;
641 #ifdef CONFIG_IPV6_SUBTREES
642 if (rt->rt6i_src.plen && saddr) {
643 ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
644 rt->rt6i_src.plen = 128;
648 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
655 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr)
657 struct rt6_info *rt = ip6_rt_copy(ort);
659 ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
660 rt->rt6i_dst.plen = 128;
661 rt->rt6i_flags |= RTF_CACHE;
662 rt->u.dst.flags |= DST_HOST;
663 rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop);
668 static struct rt6_info *ip6_pol_route(struct fib6_table *table, int oif,
669 struct flowi *fl, int flags)
671 struct fib6_node *fn;
672 struct rt6_info *rt, *nrt;
676 int reachable = ipv6_devconf.forwarding ? 0 : RT6_LOOKUP_F_REACHABLE;
678 strict |= flags & RT6_LOOKUP_F_IFACE;
681 read_lock_bh(&table->tb6_lock);
684 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
687 rt = rt6_select(fn, oif, strict | reachable);
688 BACKTRACK(&fl->fl6_src);
689 if (rt == &ip6_null_entry ||
690 rt->rt6i_flags & RTF_CACHE)
693 dst_hold(&rt->u.dst);
694 read_unlock_bh(&table->tb6_lock);
696 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
697 nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src);
699 #if CLONE_OFFLINK_ROUTE
700 nrt = rt6_alloc_clone(rt, &fl->fl6_dst);
706 dst_release(&rt->u.dst);
707 rt = nrt ? : &ip6_null_entry;
709 dst_hold(&rt->u.dst);
711 err = ip6_ins_rt(nrt);
720 * Race condition! In the gap, when table->tb6_lock was
721 * released someone could insert this route. Relookup.
723 dst_release(&rt->u.dst);
731 dst_hold(&rt->u.dst);
732 read_unlock_bh(&table->tb6_lock);
734 rt->u.dst.lastuse = jiffies;
740 static struct rt6_info *ip6_pol_route_input(struct fib6_table *table,
741 struct flowi *fl, int flags)
743 return ip6_pol_route(table, fl->iif, fl, flags);
746 void ip6_route_input(struct sk_buff *skb)
748 struct ipv6hdr *iph = ipv6_hdr(skb);
749 int flags = RT6_LOOKUP_F_HAS_SADDR;
751 .iif = skb->dev->ifindex,
756 .flowlabel = (* (__be32 *) iph)&IPV6_FLOWINFO_MASK,
760 .proto = iph->nexthdr,
763 if (rt6_need_strict(&iph->daddr))
764 flags |= RT6_LOOKUP_F_IFACE;
766 skb->dst = fib6_rule_lookup(&init_net, &fl, flags, ip6_pol_route_input);
769 static struct rt6_info *ip6_pol_route_output(struct fib6_table *table,
770 struct flowi *fl, int flags)
772 return ip6_pol_route(table, fl->oif, fl, flags);
775 struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
779 if (rt6_need_strict(&fl->fl6_dst))
780 flags |= RT6_LOOKUP_F_IFACE;
782 if (!ipv6_addr_any(&fl->fl6_src))
783 flags |= RT6_LOOKUP_F_HAS_SADDR;
785 return fib6_rule_lookup(&init_net, fl, flags, ip6_pol_route_output);
788 EXPORT_SYMBOL(ip6_route_output);
790 int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
792 struct rt6_info *ort = (struct rt6_info *) *dstp;
793 struct rt6_info *rt = (struct rt6_info *)
794 dst_alloc(&ip6_dst_blackhole_ops);
795 struct dst_entry *new = NULL;
800 atomic_set(&new->__refcnt, 1);
802 new->input = dst_discard;
803 new->output = dst_discard;
805 memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
806 new->dev = ort->u.dst.dev;
809 rt->rt6i_idev = ort->rt6i_idev;
811 in6_dev_hold(rt->rt6i_idev);
812 rt->rt6i_expires = 0;
814 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
815 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
818 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
819 #ifdef CONFIG_IPV6_SUBTREES
820 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
828 return (new ? 0 : -ENOMEM);
830 EXPORT_SYMBOL_GPL(ip6_dst_blackhole);
833 * Destination cache support functions
836 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
840 rt = (struct rt6_info *) dst;
842 if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
848 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
850 struct rt6_info *rt = (struct rt6_info *) dst;
853 if (rt->rt6i_flags & RTF_CACHE)
861 static void ip6_link_failure(struct sk_buff *skb)
865 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
867 rt = (struct rt6_info *) skb->dst;
869 if (rt->rt6i_flags&RTF_CACHE) {
870 dst_set_expires(&rt->u.dst, 0);
871 rt->rt6i_flags |= RTF_EXPIRES;
872 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
873 rt->rt6i_node->fn_sernum = -1;
877 static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
879 struct rt6_info *rt6 = (struct rt6_info*)dst;
881 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
882 rt6->rt6i_flags |= RTF_MODIFIED;
883 if (mtu < IPV6_MIN_MTU) {
885 dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
887 dst->metrics[RTAX_MTU-1] = mtu;
888 call_netevent_notifiers(NETEVENT_PMTU_UPDATE, dst);
892 static int ipv6_get_mtu(struct net_device *dev);
894 static inline unsigned int ipv6_advmss(unsigned int mtu)
896 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
898 if (mtu < init_net.ipv6.sysctl.ip6_rt_min_advmss)
899 mtu = init_net.ipv6.sysctl.ip6_rt_min_advmss;
902 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
903 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
904 * IPV6_MAXPLEN is also valid and means: "any MSS,
905 * rely only on pmtu discovery"
907 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
912 static struct dst_entry *icmp6_dst_gc_list;
913 static DEFINE_SPINLOCK(icmp6_dst_lock);
915 struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
916 struct neighbour *neigh,
917 struct in6_addr *addr)
920 struct inet6_dev *idev = in6_dev_get(dev);
922 if (unlikely(idev == NULL))
925 rt = ip6_dst_alloc();
926 if (unlikely(rt == NULL)) {
935 neigh = ndisc_get_neigh(dev, addr);
938 rt->rt6i_idev = idev;
939 rt->rt6i_nexthop = neigh;
940 atomic_set(&rt->u.dst.__refcnt, 1);
941 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
942 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
943 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
944 rt->u.dst.output = ip6_output;
946 #if 0 /* there's no chance to use these for ndisc */
947 rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
950 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
951 rt->rt6i_dst.plen = 128;
954 spin_lock_bh(&icmp6_dst_lock);
955 rt->u.dst.next = icmp6_dst_gc_list;
956 icmp6_dst_gc_list = &rt->u.dst;
957 spin_unlock_bh(&icmp6_dst_lock);
959 fib6_force_start_gc(dev->nd_net);
965 int icmp6_dst_gc(int *more)
967 struct dst_entry *dst, *next, **pprev;
973 spin_lock_bh(&icmp6_dst_lock);
974 pprev = &icmp6_dst_gc_list;
976 while ((dst = *pprev) != NULL) {
977 if (!atomic_read(&dst->__refcnt)) {
987 spin_unlock_bh(&icmp6_dst_lock);
992 static int ip6_dst_gc(struct dst_ops *ops)
994 static unsigned expire = 30*HZ;
995 static unsigned long last_gc;
996 unsigned long now = jiffies;
998 if (time_after(last_gc + init_net.ipv6.sysctl.ip6_rt_gc_min_interval, now) &&
999 atomic_read(&ip6_dst_ops.entries) <= init_net.ipv6.sysctl.ip6_rt_max_size)
1003 fib6_run_gc(expire, &init_net);
1005 if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
1006 expire = init_net.ipv6.sysctl.ip6_rt_gc_timeout>>1;
1009 expire -= expire>>init_net.ipv6.sysctl.ip6_rt_gc_elasticity;
1010 return (atomic_read(&ip6_dst_ops.entries) > init_net.ipv6.sysctl.ip6_rt_max_size);
1013 /* Clean host part of a prefix. Not necessary in radix tree,
1014 but results in cleaner routing tables.
1016 Remove it only when all the things will work!
1019 static int ipv6_get_mtu(struct net_device *dev)
1021 int mtu = IPV6_MIN_MTU;
1022 struct inet6_dev *idev;
1024 idev = in6_dev_get(dev);
1026 mtu = idev->cnf.mtu6;
1032 int ipv6_get_hoplimit(struct net_device *dev)
1034 int hoplimit = ipv6_devconf.hop_limit;
1035 struct inet6_dev *idev;
1037 idev = in6_dev_get(dev);
1039 hoplimit = idev->cnf.hop_limit;
1049 int ip6_route_add(struct fib6_config *cfg)
1052 struct rt6_info *rt = NULL;
1053 struct net_device *dev = NULL;
1054 struct inet6_dev *idev = NULL;
1055 struct fib6_table *table;
1058 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
1060 #ifndef CONFIG_IPV6_SUBTREES
1061 if (cfg->fc_src_len)
1064 if (cfg->fc_ifindex) {
1066 dev = dev_get_by_index(&init_net, cfg->fc_ifindex);
1069 idev = in6_dev_get(dev);
1074 if (cfg->fc_metric == 0)
1075 cfg->fc_metric = IP6_RT_PRIO_USER;
1077 table = fib6_new_table(&init_net, cfg->fc_table);
1078 if (table == NULL) {
1083 rt = ip6_dst_alloc();
1090 rt->u.dst.obsolete = -1;
1091 rt->rt6i_expires = jiffies + clock_t_to_jiffies(cfg->fc_expires);
1093 if (cfg->fc_protocol == RTPROT_UNSPEC)
1094 cfg->fc_protocol = RTPROT_BOOT;
1095 rt->rt6i_protocol = cfg->fc_protocol;
1097 addr_type = ipv6_addr_type(&cfg->fc_dst);
1099 if (addr_type & IPV6_ADDR_MULTICAST)
1100 rt->u.dst.input = ip6_mc_input;
1102 rt->u.dst.input = ip6_forward;
1104 rt->u.dst.output = ip6_output;
1106 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
1107 rt->rt6i_dst.plen = cfg->fc_dst_len;
1108 if (rt->rt6i_dst.plen == 128)
1109 rt->u.dst.flags = DST_HOST;
1111 #ifdef CONFIG_IPV6_SUBTREES
1112 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
1113 rt->rt6i_src.plen = cfg->fc_src_len;
1116 rt->rt6i_metric = cfg->fc_metric;
1118 /* We cannot add true routes via loopback here,
1119 they would result in kernel looping; promote them to reject routes
1121 if ((cfg->fc_flags & RTF_REJECT) ||
1122 (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
1123 /* hold loopback dev/idev if we haven't done so. */
1124 if (dev != init_net.loopback_dev) {
1129 dev = init_net.loopback_dev;
1131 idev = in6_dev_get(dev);
1137 rt->u.dst.output = ip6_pkt_discard_out;
1138 rt->u.dst.input = ip6_pkt_discard;
1139 rt->u.dst.error = -ENETUNREACH;
1140 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
1144 if (cfg->fc_flags & RTF_GATEWAY) {
1145 struct in6_addr *gw_addr;
1148 gw_addr = &cfg->fc_gateway;
1149 ipv6_addr_copy(&rt->rt6i_gateway, gw_addr);
1150 gwa_type = ipv6_addr_type(gw_addr);
1152 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
1153 struct rt6_info *grt;
1155 /* IPv6 strictly inhibits using not link-local
1156 addresses as nexthop address.
1157 Otherwise, router will not able to send redirects.
1158 It is very good, but in some (rare!) circumstances
1159 (SIT, PtP, NBMA NOARP links) it is handy to allow
1160 some exceptions. --ANK
1163 if (!(gwa_type&IPV6_ADDR_UNICAST))
1166 grt = rt6_lookup(&init_net, gw_addr, NULL, cfg->fc_ifindex, 1);
1168 err = -EHOSTUNREACH;
1172 if (dev != grt->rt6i_dev) {
1173 dst_release(&grt->u.dst);
1177 dev = grt->rt6i_dev;
1178 idev = grt->rt6i_idev;
1180 in6_dev_hold(grt->rt6i_idev);
1182 if (!(grt->rt6i_flags&RTF_GATEWAY))
1184 dst_release(&grt->u.dst);
1190 if (dev == NULL || (dev->flags&IFF_LOOPBACK))
1198 if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
1199 rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
1200 if (IS_ERR(rt->rt6i_nexthop)) {
1201 err = PTR_ERR(rt->rt6i_nexthop);
1202 rt->rt6i_nexthop = NULL;
1207 rt->rt6i_flags = cfg->fc_flags;
1214 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
1215 int type = nla_type(nla);
1218 if (type > RTAX_MAX) {
1223 rt->u.dst.metrics[type - 1] = nla_get_u32(nla);
1228 if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
1229 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1230 if (!rt->u.dst.metrics[RTAX_MTU-1])
1231 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
1232 if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
1233 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1234 rt->u.dst.dev = dev;
1235 rt->rt6i_idev = idev;
1236 rt->rt6i_table = table;
1238 cfg->fc_nlinfo.nl_net = dev->nd_net;
1240 return __ip6_ins_rt(rt, &cfg->fc_nlinfo);
1248 dst_free(&rt->u.dst);
1252 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
1255 struct fib6_table *table;
1257 if (rt == &ip6_null_entry)
1260 table = rt->rt6i_table;
1261 write_lock_bh(&table->tb6_lock);
1263 err = fib6_del(rt, info);
1264 dst_release(&rt->u.dst);
1266 write_unlock_bh(&table->tb6_lock);
1271 int ip6_del_rt(struct rt6_info *rt)
1273 struct nl_info info = {
1274 .nl_net = &init_net,
1276 return __ip6_del_rt(rt, &info);
1279 static int ip6_route_del(struct fib6_config *cfg)
1281 struct fib6_table *table;
1282 struct fib6_node *fn;
1283 struct rt6_info *rt;
1286 table = fib6_get_table(&init_net, cfg->fc_table);
1290 read_lock_bh(&table->tb6_lock);
1292 fn = fib6_locate(&table->tb6_root,
1293 &cfg->fc_dst, cfg->fc_dst_len,
1294 &cfg->fc_src, cfg->fc_src_len);
1297 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1298 if (cfg->fc_ifindex &&
1299 (rt->rt6i_dev == NULL ||
1300 rt->rt6i_dev->ifindex != cfg->fc_ifindex))
1302 if (cfg->fc_flags & RTF_GATEWAY &&
1303 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
1305 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
1307 dst_hold(&rt->u.dst);
1308 read_unlock_bh(&table->tb6_lock);
1310 return __ip6_del_rt(rt, &cfg->fc_nlinfo);
1313 read_unlock_bh(&table->tb6_lock);
1321 struct ip6rd_flowi {
1323 struct in6_addr gateway;
1326 static struct rt6_info *__ip6_route_redirect(struct fib6_table *table,
1330 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl;
1331 struct rt6_info *rt;
1332 struct fib6_node *fn;
1335 * Get the "current" route for this destination and
1336 * check if the redirect has come from approriate router.
1338 * RFC 2461 specifies that redirects should only be
1339 * accepted if they come from the nexthop to the target.
1340 * Due to the way the routes are chosen, this notion
1341 * is a bit fuzzy and one might need to check all possible
1345 read_lock_bh(&table->tb6_lock);
1346 fn = fib6_lookup(&table->tb6_root, &fl->fl6_dst, &fl->fl6_src);
1348 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1350 * Current route is on-link; redirect is always invalid.
1352 * Seems, previous statement is not true. It could
1353 * be node, which looks for us as on-link (f.e. proxy ndisc)
1354 * But then router serving it might decide, that we should
1355 * know truth 8)8) --ANK (980726).
1357 if (rt6_check_expired(rt))
1359 if (!(rt->rt6i_flags & RTF_GATEWAY))
1361 if (fl->oif != rt->rt6i_dev->ifindex)
1363 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
1369 rt = &ip6_null_entry;
1370 BACKTRACK(&fl->fl6_src);
1372 dst_hold(&rt->u.dst);
1374 read_unlock_bh(&table->tb6_lock);
1379 static struct rt6_info *ip6_route_redirect(struct in6_addr *dest,
1380 struct in6_addr *src,
1381 struct in6_addr *gateway,
1382 struct net_device *dev)
1384 int flags = RT6_LOOKUP_F_HAS_SADDR;
1385 struct ip6rd_flowi rdfl = {
1387 .oif = dev->ifindex,
1395 .gateway = *gateway,
1398 if (rt6_need_strict(dest))
1399 flags |= RT6_LOOKUP_F_IFACE;
1401 return (struct rt6_info *)fib6_rule_lookup(&init_net,
1402 (struct flowi *)&rdfl,
1403 flags, __ip6_route_redirect);
1406 void rt6_redirect(struct in6_addr *dest, struct in6_addr *src,
1407 struct in6_addr *saddr,
1408 struct neighbour *neigh, u8 *lladdr, int on_link)
1410 struct rt6_info *rt, *nrt = NULL;
1411 struct netevent_redirect netevent;
1413 rt = ip6_route_redirect(dest, src, saddr, neigh->dev);
1415 if (rt == &ip6_null_entry) {
1416 if (net_ratelimit())
1417 printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
1418 "for redirect target\n");
1423 * We have finally decided to accept it.
1426 neigh_update(neigh, lladdr, NUD_STALE,
1427 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1428 NEIGH_UPDATE_F_OVERRIDE|
1429 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1430 NEIGH_UPDATE_F_ISROUTER))
1434 * Redirect received -> path was valid.
1435 * Look, redirects are sent only in response to data packets,
1436 * so that this nexthop apparently is reachable. --ANK
1438 dst_confirm(&rt->u.dst);
1440 /* Duplicate redirect: silently ignore. */
1441 if (neigh == rt->u.dst.neighbour)
1444 nrt = ip6_rt_copy(rt);
1448 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
1450 nrt->rt6i_flags &= ~RTF_GATEWAY;
1452 ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
1453 nrt->rt6i_dst.plen = 128;
1454 nrt->u.dst.flags |= DST_HOST;
1456 ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
1457 nrt->rt6i_nexthop = neigh_clone(neigh);
1458 /* Reset pmtu, it may be better */
1459 nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
1460 nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
1462 if (ip6_ins_rt(nrt))
1465 netevent.old = &rt->u.dst;
1466 netevent.new = &nrt->u.dst;
1467 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
1469 if (rt->rt6i_flags&RTF_CACHE) {
1475 dst_release(&rt->u.dst);
1480 * Handle ICMP "packet too big" messages
1481 * i.e. Path MTU discovery
1484 void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
1485 struct net_device *dev, u32 pmtu)
1487 struct rt6_info *rt, *nrt;
1490 rt = rt6_lookup(dev->nd_net, daddr, saddr, dev->ifindex, 0);
1494 if (pmtu >= dst_mtu(&rt->u.dst))
1497 if (pmtu < IPV6_MIN_MTU) {
1499 * According to RFC2460, PMTU is set to the IPv6 Minimum Link
1500 * MTU (1280) and a fragment header should always be included
1501 * after a node receiving Too Big message reporting PMTU is
1502 * less than the IPv6 Minimum Link MTU.
1504 pmtu = IPV6_MIN_MTU;
1508 /* New mtu received -> path was valid.
1509 They are sent only in response to data packets,
1510 so that this nexthop apparently is reachable. --ANK
1512 dst_confirm(&rt->u.dst);
1514 /* Host route. If it is static, it would be better
1515 not to override it, but add new one, so that
1516 when cache entry will expire old pmtu
1517 would return automatically.
1519 if (rt->rt6i_flags & RTF_CACHE) {
1520 rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1522 rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1523 dst_set_expires(&rt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires);
1524 rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
1529 Two cases are possible:
1530 1. It is connected route. Action: COW
1531 2. It is gatewayed route or NONEXTHOP route. Action: clone it.
1533 if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP))
1534 nrt = rt6_alloc_cow(rt, daddr, saddr);
1536 nrt = rt6_alloc_clone(rt, daddr);
1539 nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
1541 nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
1543 /* According to RFC 1981, detecting PMTU increase shouldn't be
1544 * happened within 5 mins, the recommended timer is 10 mins.
1545 * Here this route expiration time is set to ip6_rt_mtu_expires
1546 * which is 10 mins. After 10 mins the decreased pmtu is expired
1547 * and detecting PMTU increase will be automatically happened.
1549 dst_set_expires(&nrt->u.dst, init_net.ipv6.sysctl.ip6_rt_mtu_expires);
1550 nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
1555 dst_release(&rt->u.dst);
1559 * Misc support functions
1562 static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
1564 struct rt6_info *rt = ip6_dst_alloc();
1567 rt->u.dst.input = ort->u.dst.input;
1568 rt->u.dst.output = ort->u.dst.output;
1570 memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
1571 rt->u.dst.error = ort->u.dst.error;
1572 rt->u.dst.dev = ort->u.dst.dev;
1574 dev_hold(rt->u.dst.dev);
1575 rt->rt6i_idev = ort->rt6i_idev;
1577 in6_dev_hold(rt->rt6i_idev);
1578 rt->u.dst.lastuse = jiffies;
1579 rt->rt6i_expires = 0;
1581 ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
1582 rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
1583 rt->rt6i_metric = 0;
1585 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
1586 #ifdef CONFIG_IPV6_SUBTREES
1587 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
1589 rt->rt6i_table = ort->rt6i_table;
1594 #ifdef CONFIG_IPV6_ROUTE_INFO
1595 static struct rt6_info *rt6_get_route_info(struct net *net,
1596 struct in6_addr *prefix, int prefixlen,
1597 struct in6_addr *gwaddr, int ifindex)
1599 struct fib6_node *fn;
1600 struct rt6_info *rt = NULL;
1601 struct fib6_table *table;
1603 table = fib6_get_table(net, RT6_TABLE_INFO);
1607 write_lock_bh(&table->tb6_lock);
1608 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0);
1612 for (rt = fn->leaf; rt; rt = rt->u.dst.rt6_next) {
1613 if (rt->rt6i_dev->ifindex != ifindex)
1615 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
1617 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
1619 dst_hold(&rt->u.dst);
1623 write_unlock_bh(&table->tb6_lock);
1627 static struct rt6_info *rt6_add_route_info(struct net *net,
1628 struct in6_addr *prefix, int prefixlen,
1629 struct in6_addr *gwaddr, int ifindex,
1632 struct fib6_config cfg = {
1633 .fc_table = RT6_TABLE_INFO,
1634 .fc_metric = IP6_RT_PRIO_USER,
1635 .fc_ifindex = ifindex,
1636 .fc_dst_len = prefixlen,
1637 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
1638 RTF_UP | RTF_PREF(pref),
1640 .fc_nlinfo.nlh = NULL,
1641 .fc_nlinfo.nl_net = net,
1644 ipv6_addr_copy(&cfg.fc_dst, prefix);
1645 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1647 /* We should treat it as a default route if prefix length is 0. */
1649 cfg.fc_flags |= RTF_DEFAULT;
1651 ip6_route_add(&cfg);
1653 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex);
1657 struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
1659 struct rt6_info *rt;
1660 struct fib6_table *table;
1662 table = fib6_get_table(&init_net, RT6_TABLE_DFLT);
1666 write_lock_bh(&table->tb6_lock);
1667 for (rt = table->tb6_root.leaf; rt; rt=rt->u.dst.rt6_next) {
1668 if (dev == rt->rt6i_dev &&
1669 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
1670 ipv6_addr_equal(&rt->rt6i_gateway, addr))
1674 dst_hold(&rt->u.dst);
1675 write_unlock_bh(&table->tb6_lock);
1679 EXPORT_SYMBOL(rt6_get_dflt_router);
1681 struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
1682 struct net_device *dev,
1685 struct fib6_config cfg = {
1686 .fc_table = RT6_TABLE_DFLT,
1687 .fc_metric = IP6_RT_PRIO_USER,
1688 .fc_ifindex = dev->ifindex,
1689 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
1690 RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
1693 ipv6_addr_copy(&cfg.fc_gateway, gwaddr);
1695 ip6_route_add(&cfg);
1697 return rt6_get_dflt_router(gwaddr, dev);
1700 void rt6_purge_dflt_routers(void)
1702 struct rt6_info *rt;
1703 struct fib6_table *table;
1705 /* NOTE: Keep consistent with rt6_get_dflt_router */
1706 table = fib6_get_table(&init_net, RT6_TABLE_DFLT);
1711 read_lock_bh(&table->tb6_lock);
1712 for (rt = table->tb6_root.leaf; rt; rt = rt->u.dst.rt6_next) {
1713 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
1714 dst_hold(&rt->u.dst);
1715 read_unlock_bh(&table->tb6_lock);
1720 read_unlock_bh(&table->tb6_lock);
1723 static void rtmsg_to_fib6_config(struct in6_rtmsg *rtmsg,
1724 struct fib6_config *cfg)
1726 memset(cfg, 0, sizeof(*cfg));
1728 cfg->fc_table = RT6_TABLE_MAIN;
1729 cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
1730 cfg->fc_metric = rtmsg->rtmsg_metric;
1731 cfg->fc_expires = rtmsg->rtmsg_info;
1732 cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
1733 cfg->fc_src_len = rtmsg->rtmsg_src_len;
1734 cfg->fc_flags = rtmsg->rtmsg_flags;
1736 cfg->fc_nlinfo.nl_net = &init_net;
1738 ipv6_addr_copy(&cfg->fc_dst, &rtmsg->rtmsg_dst);
1739 ipv6_addr_copy(&cfg->fc_src, &rtmsg->rtmsg_src);
1740 ipv6_addr_copy(&cfg->fc_gateway, &rtmsg->rtmsg_gateway);
1743 int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
1745 struct fib6_config cfg;
1746 struct in6_rtmsg rtmsg;
1750 case SIOCADDRT: /* Add a route */
1751 case SIOCDELRT: /* Delete a route */
1752 if (!capable(CAP_NET_ADMIN))
1754 err = copy_from_user(&rtmsg, arg,
1755 sizeof(struct in6_rtmsg));
1759 rtmsg_to_fib6_config(&rtmsg, &cfg);
1764 err = ip6_route_add(&cfg);
1767 err = ip6_route_del(&cfg);
1781 * Drop the packet on the floor
1784 static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes)
1787 switch (ipstats_mib_noroutes) {
1788 case IPSTATS_MIB_INNOROUTES:
1789 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
1790 if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED) {
1791 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INADDRERRORS);
1795 case IPSTATS_MIB_OUTNOROUTES:
1796 IP6_INC_STATS(ip6_dst_idev(skb->dst), ipstats_mib_noroutes);
1799 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
1804 static int ip6_pkt_discard(struct sk_buff *skb)
1806 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
1809 static int ip6_pkt_discard_out(struct sk_buff *skb)
1811 skb->dev = skb->dst->dev;
1812 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
1815 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
1817 static int ip6_pkt_prohibit(struct sk_buff *skb)
1819 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
1822 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
1824 skb->dev = skb->dst->dev;
1825 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
1831 * Allocate a dst for local (unicast / anycast) address.
1834 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
1835 const struct in6_addr *addr,
1838 struct rt6_info *rt = ip6_dst_alloc();
1841 return ERR_PTR(-ENOMEM);
1843 dev_hold(init_net.loopback_dev);
1846 rt->u.dst.flags = DST_HOST;
1847 rt->u.dst.input = ip6_input;
1848 rt->u.dst.output = ip6_output;
1849 rt->rt6i_dev = init_net.loopback_dev;
1850 rt->rt6i_idev = idev;
1851 rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
1852 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
1853 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
1854 rt->u.dst.obsolete = -1;
1856 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
1858 rt->rt6i_flags |= RTF_ANYCAST;
1860 rt->rt6i_flags |= RTF_LOCAL;
1861 rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
1862 if (rt->rt6i_nexthop == NULL) {
1863 dst_free(&rt->u.dst);
1864 return ERR_PTR(-ENOMEM);
1867 ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
1868 rt->rt6i_dst.plen = 128;
1869 rt->rt6i_table = fib6_get_table(&init_net, RT6_TABLE_LOCAL);
1871 atomic_set(&rt->u.dst.__refcnt, 1);
1876 static int fib6_ifdown(struct rt6_info *rt, void *arg)
1878 if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
1879 rt != &ip6_null_entry) {
1880 RT6_TRACE("deleted by ifdown %p\n", rt);
1886 void rt6_ifdown(struct net *net, struct net_device *dev)
1888 fib6_clean_all(net, fib6_ifdown, 0, dev);
1891 struct rt6_mtu_change_arg
1893 struct net_device *dev;
1897 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
1899 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
1900 struct inet6_dev *idev;
1902 /* In IPv6 pmtu discovery is not optional,
1903 so that RTAX_MTU lock cannot disable it.
1904 We still use this lock to block changes
1905 caused by addrconf/ndisc.
1908 idev = __in6_dev_get(arg->dev);
1912 /* For administrative MTU increase, there is no way to discover
1913 IPv6 PMTU increase, so PMTU increase should be updated here.
1914 Since RFC 1981 doesn't include administrative MTU increase
1915 update PMTU increase is a MUST. (i.e. jumbo frame)
1918 If new MTU is less than route PMTU, this new MTU will be the
1919 lowest MTU in the path, update the route PMTU to reflect PMTU
1920 decreases; if new MTU is greater than route PMTU, and the
1921 old MTU is the lowest MTU in the path, update the route PMTU
1922 to reflect the increase. In this case if the other nodes' MTU
1923 also have the lowest MTU, TOO BIG MESSAGE will be lead to
1926 if (rt->rt6i_dev == arg->dev &&
1927 !dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
1928 (dst_mtu(&rt->u.dst) >= arg->mtu ||
1929 (dst_mtu(&rt->u.dst) < arg->mtu &&
1930 dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) {
1931 rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
1932 rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
1937 void rt6_mtu_change(struct net_device *dev, unsigned mtu)
1939 struct rt6_mtu_change_arg arg = {
1944 fib6_clean_all(dev->nd_net, rt6_mtu_change_route, 0, &arg);
1947 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
1948 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
1949 [RTA_OIF] = { .type = NLA_U32 },
1950 [RTA_IIF] = { .type = NLA_U32 },
1951 [RTA_PRIORITY] = { .type = NLA_U32 },
1952 [RTA_METRICS] = { .type = NLA_NESTED },
1955 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
1956 struct fib6_config *cfg)
1959 struct nlattr *tb[RTA_MAX+1];
1962 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
1967 rtm = nlmsg_data(nlh);
1968 memset(cfg, 0, sizeof(*cfg));
1970 cfg->fc_table = rtm->rtm_table;
1971 cfg->fc_dst_len = rtm->rtm_dst_len;
1972 cfg->fc_src_len = rtm->rtm_src_len;
1973 cfg->fc_flags = RTF_UP;
1974 cfg->fc_protocol = rtm->rtm_protocol;
1976 if (rtm->rtm_type == RTN_UNREACHABLE)
1977 cfg->fc_flags |= RTF_REJECT;
1979 cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid;
1980 cfg->fc_nlinfo.nlh = nlh;
1981 cfg->fc_nlinfo.nl_net = skb->sk->sk_net;
1983 if (tb[RTA_GATEWAY]) {
1984 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16);
1985 cfg->fc_flags |= RTF_GATEWAY;
1989 int plen = (rtm->rtm_dst_len + 7) >> 3;
1991 if (nla_len(tb[RTA_DST]) < plen)
1994 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
1998 int plen = (rtm->rtm_src_len + 7) >> 3;
2000 if (nla_len(tb[RTA_SRC]) < plen)
2003 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
2007 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
2009 if (tb[RTA_PRIORITY])
2010 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
2012 if (tb[RTA_METRICS]) {
2013 cfg->fc_mx = nla_data(tb[RTA_METRICS]);
2014 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
2018 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
2025 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2027 struct net *net = skb->sk->sk_net;
2028 struct fib6_config cfg;
2031 if (net != &init_net)
2034 err = rtm_to_fib6_config(skb, nlh, &cfg);
2038 return ip6_route_del(&cfg);
2041 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
2043 struct net *net = skb->sk->sk_net;
2044 struct fib6_config cfg;
2047 if (net != &init_net)
2050 err = rtm_to_fib6_config(skb, nlh, &cfg);
2054 return ip6_route_add(&cfg);
2057 static inline size_t rt6_nlmsg_size(void)
2059 return NLMSG_ALIGN(sizeof(struct rtmsg))
2060 + nla_total_size(16) /* RTA_SRC */
2061 + nla_total_size(16) /* RTA_DST */
2062 + nla_total_size(16) /* RTA_GATEWAY */
2063 + nla_total_size(16) /* RTA_PREFSRC */
2064 + nla_total_size(4) /* RTA_TABLE */
2065 + nla_total_size(4) /* RTA_IIF */
2066 + nla_total_size(4) /* RTA_OIF */
2067 + nla_total_size(4) /* RTA_PRIORITY */
2068 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
2069 + nla_total_size(sizeof(struct rta_cacheinfo));
2072 static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
2073 struct in6_addr *dst, struct in6_addr *src,
2074 int iif, int type, u32 pid, u32 seq,
2075 int prefix, unsigned int flags)
2078 struct nlmsghdr *nlh;
2082 if (prefix) { /* user wants prefix routes only */
2083 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
2084 /* success since this is not a prefix route */
2089 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags);
2093 rtm = nlmsg_data(nlh);
2094 rtm->rtm_family = AF_INET6;
2095 rtm->rtm_dst_len = rt->rt6i_dst.plen;
2096 rtm->rtm_src_len = rt->rt6i_src.plen;
2099 table = rt->rt6i_table->tb6_id;
2101 table = RT6_TABLE_UNSPEC;
2102 rtm->rtm_table = table;
2103 NLA_PUT_U32(skb, RTA_TABLE, table);
2104 if (rt->rt6i_flags&RTF_REJECT)
2105 rtm->rtm_type = RTN_UNREACHABLE;
2106 else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
2107 rtm->rtm_type = RTN_LOCAL;
2109 rtm->rtm_type = RTN_UNICAST;
2111 rtm->rtm_scope = RT_SCOPE_UNIVERSE;
2112 rtm->rtm_protocol = rt->rt6i_protocol;
2113 if (rt->rt6i_flags&RTF_DYNAMIC)
2114 rtm->rtm_protocol = RTPROT_REDIRECT;
2115 else if (rt->rt6i_flags & RTF_ADDRCONF)
2116 rtm->rtm_protocol = RTPROT_KERNEL;
2117 else if (rt->rt6i_flags&RTF_DEFAULT)
2118 rtm->rtm_protocol = RTPROT_RA;
2120 if (rt->rt6i_flags&RTF_CACHE)
2121 rtm->rtm_flags |= RTM_F_CLONED;
2124 NLA_PUT(skb, RTA_DST, 16, dst);
2125 rtm->rtm_dst_len = 128;
2126 } else if (rtm->rtm_dst_len)
2127 NLA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
2128 #ifdef CONFIG_IPV6_SUBTREES
2130 NLA_PUT(skb, RTA_SRC, 16, src);
2131 rtm->rtm_src_len = 128;
2132 } else if (rtm->rtm_src_len)
2133 NLA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
2136 NLA_PUT_U32(skb, RTA_IIF, iif);
2138 struct in6_addr saddr_buf;
2139 if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev,
2140 dst, &saddr_buf) == 0)
2141 NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
2144 if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
2145 goto nla_put_failure;
2147 if (rt->u.dst.neighbour)
2148 NLA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
2151 NLA_PUT_U32(skb, RTA_OIF, rt->rt6i_dev->ifindex);
2153 NLA_PUT_U32(skb, RTA_PRIORITY, rt->rt6i_metric);
2155 expires = rt->rt6i_expires ? rt->rt6i_expires - jiffies : 0;
2156 if (rtnl_put_cacheinfo(skb, &rt->u.dst, 0, 0, 0,
2157 expires, rt->u.dst.error) < 0)
2158 goto nla_put_failure;
2160 return nlmsg_end(skb, nlh);
2163 nlmsg_cancel(skb, nlh);
2167 int rt6_dump_route(struct rt6_info *rt, void *p_arg)
2169 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
2172 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
2173 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
2174 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
2178 return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
2179 NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
2180 prefix, NLM_F_MULTI);
2183 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
2185 struct net *net = in_skb->sk->sk_net;
2186 struct nlattr *tb[RTA_MAX+1];
2187 struct rt6_info *rt;
2188 struct sk_buff *skb;
2193 if (net != &init_net)
2196 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
2201 memset(&fl, 0, sizeof(fl));
2204 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
2207 ipv6_addr_copy(&fl.fl6_src, nla_data(tb[RTA_SRC]));
2211 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
2214 ipv6_addr_copy(&fl.fl6_dst, nla_data(tb[RTA_DST]));
2218 iif = nla_get_u32(tb[RTA_IIF]);
2221 fl.oif = nla_get_u32(tb[RTA_OIF]);
2224 struct net_device *dev;
2225 dev = __dev_get_by_index(&init_net, iif);
2232 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
2238 /* Reserve room for dummy headers, this skb can pass
2239 through good chunk of routing engine.
2241 skb_reset_mac_header(skb);
2242 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
2244 rt = (struct rt6_info*) ip6_route_output(NULL, &fl);
2245 skb->dst = &rt->u.dst;
2247 err = rt6_fill_node(skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
2248 RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
2249 nlh->nlmsg_seq, 0, 0);
2255 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
2260 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info)
2262 struct sk_buff *skb;
2267 seq = info->nlh != NULL ? info->nlh->nlmsg_seq : 0;
2269 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any());
2273 err = rt6_fill_node(skb, rt, NULL, NULL, 0,
2274 event, info->pid, seq, 0, 0);
2276 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2277 WARN_ON(err == -EMSGSIZE);
2281 err = rtnl_notify(skb, &init_net, info->pid,
2282 RTNLGRP_IPV6_ROUTE, info->nlh, gfp_any());
2285 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_ROUTE, err);
2292 #ifdef CONFIG_PROC_FS
2294 #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
2305 static int rt6_info_route(struct rt6_info *rt, void *p_arg)
2307 struct seq_file *m = p_arg;
2309 seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_dst.addr),
2312 #ifdef CONFIG_IPV6_SUBTREES
2313 seq_printf(m, NIP6_SEQFMT " %02x ", NIP6(rt->rt6i_src.addr),
2316 seq_puts(m, "00000000000000000000000000000000 00 ");
2319 if (rt->rt6i_nexthop) {
2320 seq_printf(m, NIP6_SEQFMT,
2321 NIP6(*((struct in6_addr *)rt->rt6i_nexthop->primary_key)));
2323 seq_puts(m, "00000000000000000000000000000000");
2325 seq_printf(m, " %08x %08x %08x %08x %8s\n",
2326 rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
2327 rt->u.dst.__use, rt->rt6i_flags,
2328 rt->rt6i_dev ? rt->rt6i_dev->name : "");
2332 static int ipv6_route_show(struct seq_file *m, void *v)
2334 struct net *net = (struct net *)m->private;
2335 fib6_clean_all(net, rt6_info_route, 0, m);
2339 static int ipv6_route_open(struct inode *inode, struct file *file)
2341 struct net *net = get_proc_net(inode);
2344 return single_open(file, ipv6_route_show, net);
2347 static int ipv6_route_release(struct inode *inode, struct file *file)
2349 struct seq_file *seq = file->private_data;
2350 struct net *net = seq->private;
2352 return single_release(inode, file);
2355 static const struct file_operations ipv6_route_proc_fops = {
2356 .owner = THIS_MODULE,
2357 .open = ipv6_route_open,
2359 .llseek = seq_lseek,
2360 .release = ipv6_route_release,
2363 static int rt6_stats_seq_show(struct seq_file *seq, void *v)
2365 struct net *net = (struct net *)seq->private;
2366 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
2367 net->ipv6.rt6_stats->fib_nodes,
2368 net->ipv6.rt6_stats->fib_route_nodes,
2369 net->ipv6.rt6_stats->fib_rt_alloc,
2370 net->ipv6.rt6_stats->fib_rt_entries,
2371 net->ipv6.rt6_stats->fib_rt_cache,
2372 atomic_read(&ip6_dst_ops.entries),
2373 net->ipv6.rt6_stats->fib_discarded_routes);
2378 static int rt6_stats_seq_open(struct inode *inode, struct file *file)
2380 struct net *net = get_proc_net(inode);
2381 return single_open(file, rt6_stats_seq_show, net);
2384 static int rt6_stats_seq_release(struct inode *inode, struct file *file)
2386 struct seq_file *seq = file->private_data;
2387 struct net *net = (struct net *)seq->private;
2389 return single_release(inode, file);
2392 static const struct file_operations rt6_stats_seq_fops = {
2393 .owner = THIS_MODULE,
2394 .open = rt6_stats_seq_open,
2396 .llseek = seq_lseek,
2397 .release = rt6_stats_seq_release,
2399 #endif /* CONFIG_PROC_FS */
2401 #ifdef CONFIG_SYSCTL
2404 int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
2405 void __user *buffer, size_t *lenp, loff_t *ppos)
2407 struct net *net = current->nsproxy->net_ns;
2408 int delay = net->ipv6.sysctl.flush_delay;
2410 proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
2411 fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net);
2417 ctl_table ipv6_route_table_template[] = {
2419 .procname = "flush",
2420 .data = &init_net.ipv6.sysctl.flush_delay,
2421 .maxlen = sizeof(int),
2423 .proc_handler = &ipv6_sysctl_rtcache_flush
2426 .ctl_name = NET_IPV6_ROUTE_GC_THRESH,
2427 .procname = "gc_thresh",
2428 .data = &ip6_dst_ops.gc_thresh,
2429 .maxlen = sizeof(int),
2431 .proc_handler = &proc_dointvec,
2434 .ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
2435 .procname = "max_size",
2436 .data = &init_net.ipv6.sysctl.ip6_rt_max_size,
2437 .maxlen = sizeof(int),
2439 .proc_handler = &proc_dointvec,
2442 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
2443 .procname = "gc_min_interval",
2444 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2445 .maxlen = sizeof(int),
2447 .proc_handler = &proc_dointvec_jiffies,
2448 .strategy = &sysctl_jiffies,
2451 .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
2452 .procname = "gc_timeout",
2453 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
2454 .maxlen = sizeof(int),
2456 .proc_handler = &proc_dointvec_jiffies,
2457 .strategy = &sysctl_jiffies,
2460 .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
2461 .procname = "gc_interval",
2462 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
2463 .maxlen = sizeof(int),
2465 .proc_handler = &proc_dointvec_jiffies,
2466 .strategy = &sysctl_jiffies,
2469 .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
2470 .procname = "gc_elasticity",
2471 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
2472 .maxlen = sizeof(int),
2474 .proc_handler = &proc_dointvec_jiffies,
2475 .strategy = &sysctl_jiffies,
2478 .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
2479 .procname = "mtu_expires",
2480 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
2481 .maxlen = sizeof(int),
2483 .proc_handler = &proc_dointvec_jiffies,
2484 .strategy = &sysctl_jiffies,
2487 .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
2488 .procname = "min_adv_mss",
2489 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
2490 .maxlen = sizeof(int),
2492 .proc_handler = &proc_dointvec_jiffies,
2493 .strategy = &sysctl_jiffies,
2496 .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
2497 .procname = "gc_min_interval_ms",
2498 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
2499 .maxlen = sizeof(int),
2501 .proc_handler = &proc_dointvec_ms_jiffies,
2502 .strategy = &sysctl_ms_jiffies,
2507 struct ctl_table *ipv6_route_sysctl_init(struct net *net)
2509 struct ctl_table *table;
2511 table = kmemdup(ipv6_route_table_template,
2512 sizeof(ipv6_route_table_template),
2516 table[0].data = &net->ipv6.sysctl.flush_delay;
2517 /* table[1].data will be handled when we have
2518 routes per namespace */
2519 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
2520 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
2521 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
2522 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
2523 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
2524 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
2525 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
2532 static int ip6_route_net_init(struct net *net)
2534 #ifdef CONFIG_PROC_FS
2535 proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
2536 proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
2541 static void ip6_route_net_exit(struct net *net)
2543 #ifdef CONFIG_PROC_FS
2544 proc_net_remove(net, "ipv6_route");
2545 proc_net_remove(net, "rt6_stats");
2549 static struct pernet_operations ip6_route_net_ops = {
2550 .init = ip6_route_net_init,
2551 .exit = ip6_route_net_exit,
2554 int __init ip6_route_init(void)
2558 ip6_dst_ops.kmem_cachep =
2559 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
2560 SLAB_HWCACHE_ALIGN, NULL);
2561 if (!ip6_dst_ops.kmem_cachep)
2564 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops.kmem_cachep;
2568 goto out_kmem_cache;
2574 ret = fib6_rules_init();
2579 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL) ||
2580 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL) ||
2581 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL))
2582 goto fib6_rules_init;
2584 ret = register_pernet_subsys(&ip6_route_net_ops);
2586 goto fib6_rules_init;
2591 fib6_rules_cleanup();
2595 rt6_ifdown(&init_net, NULL);
2598 kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
2602 void ip6_route_cleanup(void)
2604 unregister_pernet_subsys(&ip6_route_net_ops);
2605 fib6_rules_cleanup();
2607 rt6_ifdown(&init_net, NULL);
2609 kmem_cache_destroy(ip6_dst_ops.kmem_cachep);