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 void ip6_link_failure(struct sk_buff
*skb
);
88 static void ip6_rt_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
89 struct sk_buff
*skb
, u32 mtu
);
90 static void rt6_do_redirect(struct dst_entry
*dst
, struct sock
*sk
,
92 static int rt6_score_route(struct rt6_info
*rt
, int oif
, int strict
);
94 #ifdef CONFIG_IPV6_ROUTE_INFO
95 static struct rt6_info
*rt6_add_route_info(struct net
*net
,
96 const struct in6_addr
*prefix
, int prefixlen
,
97 const struct in6_addr
*gwaddr
, int ifindex
,
99 static struct rt6_info
*rt6_get_route_info(struct net
*net
,
100 const struct in6_addr
*prefix
, int prefixlen
,
101 const struct in6_addr
*gwaddr
, int ifindex
);
104 static u32
*ipv6_cow_metrics(struct dst_entry
*dst
, unsigned long old
)
106 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
107 struct inet_peer
*peer
;
110 if (!(rt
->dst
.flags
& DST_HOST
))
113 peer
= rt6_get_peer_create(rt
);
115 u32
*old_p
= __DST_METRICS_PTR(old
);
116 unsigned long prev
, new;
119 if (inet_metrics_new(peer
))
120 memcpy(p
, old_p
, sizeof(u32
) * RTAX_MAX
);
122 new = (unsigned long) p
;
123 prev
= cmpxchg(&dst
->_metrics
, old
, new);
126 p
= __DST_METRICS_PTR(prev
);
127 if (prev
& DST_METRICS_READ_ONLY
)
134 static inline const void *choose_neigh_daddr(struct rt6_info
*rt
,
138 struct in6_addr
*p
= &rt
->rt6i_gateway
;
140 if (!ipv6_addr_any(p
))
141 return (const void *) p
;
143 return &ipv6_hdr(skb
)->daddr
;
147 static struct neighbour
*ip6_neigh_lookup(const struct dst_entry
*dst
,
151 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
154 daddr
= choose_neigh_daddr(rt
, skb
, daddr
);
155 n
= __ipv6_neigh_lookup(dst
->dev
, daddr
);
158 return neigh_create(&nd_tbl
, daddr
, dst
->dev
);
161 static struct dst_ops ip6_dst_ops_template
= {
163 .protocol
= cpu_to_be16(ETH_P_IPV6
),
166 .check
= ip6_dst_check
,
167 .default_advmss
= ip6_default_advmss
,
169 .cow_metrics
= ipv6_cow_metrics
,
170 .destroy
= ip6_dst_destroy
,
171 .ifdown
= ip6_dst_ifdown
,
172 .negative_advice
= ip6_negative_advice
,
173 .link_failure
= ip6_link_failure
,
174 .update_pmtu
= ip6_rt_update_pmtu
,
175 .redirect
= rt6_do_redirect
,
176 .local_out
= __ip6_local_out
,
177 .neigh_lookup
= ip6_neigh_lookup
,
180 static unsigned int ip6_blackhole_mtu(const struct dst_entry
*dst
)
182 unsigned int mtu
= dst_metric_raw(dst
, RTAX_MTU
);
184 return mtu
? : dst
->dev
->mtu
;
187 static void ip6_rt_blackhole_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
188 struct sk_buff
*skb
, u32 mtu
)
192 static void ip6_rt_blackhole_redirect(struct dst_entry
*dst
, struct sock
*sk
,
197 static u32
*ip6_rt_blackhole_cow_metrics(struct dst_entry
*dst
,
203 static struct dst_ops ip6_dst_blackhole_ops
= {
205 .protocol
= cpu_to_be16(ETH_P_IPV6
),
206 .destroy
= ip6_dst_destroy
,
207 .check
= ip6_dst_check
,
208 .mtu
= ip6_blackhole_mtu
,
209 .default_advmss
= ip6_default_advmss
,
210 .update_pmtu
= ip6_rt_blackhole_update_pmtu
,
211 .redirect
= ip6_rt_blackhole_redirect
,
212 .cow_metrics
= ip6_rt_blackhole_cow_metrics
,
213 .neigh_lookup
= ip6_neigh_lookup
,
216 static const u32 ip6_template_metrics
[RTAX_MAX
] = {
217 [RTAX_HOPLIMIT
- 1] = 0,
220 static const struct rt6_info ip6_null_entry_template
= {
222 .__refcnt
= ATOMIC_INIT(1),
224 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
225 .error
= -ENETUNREACH
,
226 .input
= ip6_pkt_discard
,
227 .output
= ip6_pkt_discard_out
,
229 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
230 .rt6i_protocol
= RTPROT_KERNEL
,
231 .rt6i_metric
= ~(u32
) 0,
232 .rt6i_ref
= ATOMIC_INIT(1),
235 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
237 static int ip6_pkt_prohibit(struct sk_buff
*skb
);
238 static int ip6_pkt_prohibit_out(struct sk_buff
*skb
);
240 static const struct rt6_info ip6_prohibit_entry_template
= {
242 .__refcnt
= ATOMIC_INIT(1),
244 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
246 .input
= ip6_pkt_prohibit
,
247 .output
= ip6_pkt_prohibit_out
,
249 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
250 .rt6i_protocol
= RTPROT_KERNEL
,
251 .rt6i_metric
= ~(u32
) 0,
252 .rt6i_ref
= ATOMIC_INIT(1),
255 static const struct rt6_info ip6_blk_hole_entry_template
= {
257 .__refcnt
= ATOMIC_INIT(1),
259 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
261 .input
= dst_discard
,
262 .output
= dst_discard
,
264 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
265 .rt6i_protocol
= RTPROT_KERNEL
,
266 .rt6i_metric
= ~(u32
) 0,
267 .rt6i_ref
= ATOMIC_INIT(1),
272 /* allocate dst with ip6_dst_ops */
273 static inline struct rt6_info
*ip6_dst_alloc(struct net
*net
,
274 struct net_device
*dev
,
276 struct fib6_table
*table
)
278 struct rt6_info
*rt
= dst_alloc(&net
->ipv6
.ip6_dst_ops
, dev
,
279 0, DST_OBSOLETE_FORCE_CHK
, flags
);
282 struct dst_entry
*dst
= &rt
->dst
;
284 memset(dst
+ 1, 0, sizeof(*rt
) - sizeof(*dst
));
285 rt6_init_peer(rt
, table
? &table
->tb6_peers
: net
->ipv6
.peers
);
286 rt
->rt6i_genid
= rt_genid(net
);
287 INIT_LIST_HEAD(&rt
->rt6i_siblings
);
288 rt
->rt6i_nsiblings
= 0;
293 static void ip6_dst_destroy(struct dst_entry
*dst
)
295 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
296 struct inet6_dev
*idev
= rt
->rt6i_idev
;
297 struct dst_entry
*from
= dst
->from
;
299 if (!(rt
->dst
.flags
& DST_HOST
))
300 dst_destroy_metrics_generic(dst
);
303 rt
->rt6i_idev
= NULL
;
310 if (rt6_has_peer(rt
)) {
311 struct inet_peer
*peer
= rt6_peer_ptr(rt
);
316 void rt6_bind_peer(struct rt6_info
*rt
, int create
)
318 struct inet_peer_base
*base
;
319 struct inet_peer
*peer
;
321 base
= inetpeer_base_ptr(rt
->_rt6i_peer
);
325 peer
= inet_getpeer_v6(base
, &rt
->rt6i_dst
.addr
, create
);
327 if (!rt6_set_peer(rt
, peer
))
332 static void ip6_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
,
335 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
336 struct inet6_dev
*idev
= rt
->rt6i_idev
;
337 struct net_device
*loopback_dev
=
338 dev_net(dev
)->loopback_dev
;
340 if (dev
!= loopback_dev
) {
341 if (idev
&& idev
->dev
== dev
) {
342 struct inet6_dev
*loopback_idev
=
343 in6_dev_get(loopback_dev
);
345 rt
->rt6i_idev
= loopback_idev
;
352 static bool rt6_check_expired(const struct rt6_info
*rt
)
354 if (rt
->rt6i_flags
& RTF_EXPIRES
) {
355 if (time_after(jiffies
, rt
->dst
.expires
))
357 } else if (rt
->dst
.from
) {
358 return rt6_check_expired((struct rt6_info
*) rt
->dst
.from
);
363 static bool rt6_need_strict(const struct in6_addr
*daddr
)
365 return ipv6_addr_type(daddr
) &
366 (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LINKLOCAL
| IPV6_ADDR_LOOPBACK
);
369 /* Multipath route selection:
370 * Hash based function using packet header and flowlabel.
371 * Adapted from fib_info_hashfn()
373 static int rt6_info_hash_nhsfn(unsigned int candidate_count
,
374 const struct flowi6
*fl6
)
376 unsigned int val
= fl6
->flowi6_proto
;
378 val
^= ipv6_addr_hash(&fl6
->daddr
);
379 val
^= ipv6_addr_hash(&fl6
->saddr
);
381 /* Work only if this not encapsulated */
382 switch (fl6
->flowi6_proto
) {
386 val
^= (__force u16
)fl6
->fl6_sport
;
387 val
^= (__force u16
)fl6
->fl6_dport
;
391 val
^= (__force u16
)fl6
->fl6_icmp_type
;
392 val
^= (__force u16
)fl6
->fl6_icmp_code
;
395 /* RFC6438 recommands to use flowlabel */
396 val
^= (__force u32
)fl6
->flowlabel
;
398 /* Perhaps, we need to tune, this function? */
399 val
= val
^ (val
>> 7) ^ (val
>> 12);
400 return val
% candidate_count
;
403 static struct rt6_info
*rt6_multipath_select(struct rt6_info
*match
,
404 struct flowi6
*fl6
, int oif
,
407 struct rt6_info
*sibling
, *next_sibling
;
410 route_choosen
= rt6_info_hash_nhsfn(match
->rt6i_nsiblings
+ 1, fl6
);
411 /* Don't change the route, if route_choosen == 0
412 * (siblings does not include ourself)
415 list_for_each_entry_safe(sibling
, next_sibling
,
416 &match
->rt6i_siblings
, rt6i_siblings
) {
418 if (route_choosen
== 0) {
419 if (rt6_score_route(sibling
, oif
, strict
) < 0)
429 * Route lookup. Any table->tb6_lock is implied.
432 static inline struct rt6_info
*rt6_device_match(struct net
*net
,
434 const struct in6_addr
*saddr
,
438 struct rt6_info
*local
= NULL
;
439 struct rt6_info
*sprt
;
441 if (!oif
&& ipv6_addr_any(saddr
))
444 for (sprt
= rt
; sprt
; sprt
= sprt
->dst
.rt6_next
) {
445 struct net_device
*dev
= sprt
->dst
.dev
;
448 if (dev
->ifindex
== oif
)
450 if (dev
->flags
& IFF_LOOPBACK
) {
451 if (!sprt
->rt6i_idev
||
452 sprt
->rt6i_idev
->dev
->ifindex
!= oif
) {
453 if (flags
& RT6_LOOKUP_F_IFACE
&& oif
)
455 if (local
&& (!oif
||
456 local
->rt6i_idev
->dev
->ifindex
== oif
))
462 if (ipv6_chk_addr(net
, saddr
, dev
,
463 flags
& RT6_LOOKUP_F_IFACE
))
472 if (flags
& RT6_LOOKUP_F_IFACE
)
473 return net
->ipv6
.ip6_null_entry
;
479 #ifdef CONFIG_IPV6_ROUTER_PREF
480 static void rt6_probe(struct rt6_info
*rt
)
482 struct neighbour
*neigh
;
484 * Okay, this does not seem to be appropriate
485 * for now, however, we need to check if it
486 * is really so; aka Router Reachability Probing.
488 * Router Reachability Probe MUST be rate-limited
489 * to no more than one per minute.
491 if (!rt
|| !(rt
->rt6i_flags
& RTF_GATEWAY
))
494 neigh
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, &rt
->rt6i_gateway
);
496 write_lock(&neigh
->lock
);
497 if (neigh
->nud_state
& NUD_VALID
)
502 time_after(jiffies
, neigh
->updated
+ rt
->rt6i_idev
->cnf
.rtr_probe_interval
)) {
503 struct in6_addr mcaddr
;
504 struct in6_addr
*target
;
507 neigh
->updated
= jiffies
;
508 write_unlock(&neigh
->lock
);
511 target
= (struct in6_addr
*)&rt
->rt6i_gateway
;
512 addrconf_addr_solict_mult(target
, &mcaddr
);
513 ndisc_send_ns(rt
->dst
.dev
, NULL
, target
, &mcaddr
, NULL
);
516 write_unlock(&neigh
->lock
);
518 rcu_read_unlock_bh();
521 static inline void rt6_probe(struct rt6_info
*rt
)
527 * Default Router Selection (RFC 2461 6.3.6)
529 static inline int rt6_check_dev(struct rt6_info
*rt
, int oif
)
531 struct net_device
*dev
= rt
->dst
.dev
;
532 if (!oif
|| dev
->ifindex
== oif
)
534 if ((dev
->flags
& IFF_LOOPBACK
) &&
535 rt
->rt6i_idev
&& rt
->rt6i_idev
->dev
->ifindex
== oif
)
540 static inline enum rt6_nud_state
rt6_check_neigh(struct rt6_info
*rt
)
542 struct neighbour
*neigh
;
543 enum rt6_nud_state ret
= RT6_NUD_FAIL_HARD
;
545 if (rt
->rt6i_flags
& RTF_NONEXTHOP
||
546 !(rt
->rt6i_flags
& RTF_GATEWAY
))
547 return RT6_NUD_SUCCEED
;
550 neigh
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, &rt
->rt6i_gateway
);
552 read_lock(&neigh
->lock
);
553 if (neigh
->nud_state
& NUD_VALID
)
554 ret
= RT6_NUD_SUCCEED
;
555 #ifdef CONFIG_IPV6_ROUTER_PREF
556 else if (!(neigh
->nud_state
& NUD_FAILED
))
557 ret
= RT6_NUD_SUCCEED
;
559 read_unlock(&neigh
->lock
);
561 ret
= IS_ENABLED(CONFIG_IPV6_ROUTER_PREF
) ?
562 RT6_NUD_SUCCEED
: RT6_NUD_FAIL_SOFT
;
564 rcu_read_unlock_bh();
569 static int rt6_score_route(struct rt6_info
*rt
, int oif
,
574 m
= rt6_check_dev(rt
, oif
);
575 if (!m
&& (strict
& RT6_LOOKUP_F_IFACE
))
576 return RT6_NUD_FAIL_HARD
;
577 #ifdef CONFIG_IPV6_ROUTER_PREF
578 m
|= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt
->rt6i_flags
)) << 2;
580 if (strict
& RT6_LOOKUP_F_REACHABLE
) {
581 int n
= rt6_check_neigh(rt
);
588 static struct rt6_info
*find_match(struct rt6_info
*rt
, int oif
, int strict
,
589 int *mpri
, struct rt6_info
*match
,
593 bool match_do_rr
= false;
595 if (rt6_check_expired(rt
))
598 m
= rt6_score_route(rt
, oif
, strict
);
599 if (m
== RT6_NUD_FAIL_SOFT
&& !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF
)) {
601 m
= 0; /* lowest valid score */
606 if (strict
& RT6_LOOKUP_F_REACHABLE
)
610 *do_rr
= match_do_rr
;
618 static struct rt6_info
*find_rr_leaf(struct fib6_node
*fn
,
619 struct rt6_info
*rr_head
,
620 u32 metric
, int oif
, int strict
,
623 struct rt6_info
*rt
, *match
;
627 for (rt
= rr_head
; rt
&& rt
->rt6i_metric
== metric
;
628 rt
= rt
->dst
.rt6_next
)
629 match
= find_match(rt
, oif
, strict
, &mpri
, match
, do_rr
);
630 for (rt
= fn
->leaf
; rt
&& rt
!= rr_head
&& rt
->rt6i_metric
== metric
;
631 rt
= rt
->dst
.rt6_next
)
632 match
= find_match(rt
, oif
, strict
, &mpri
, match
, do_rr
);
637 static struct rt6_info
*rt6_select(struct fib6_node
*fn
, int oif
, int strict
)
639 struct rt6_info
*match
, *rt0
;
645 fn
->rr_ptr
= rt0
= fn
->leaf
;
647 match
= find_rr_leaf(fn
, rt0
, rt0
->rt6i_metric
, oif
, strict
,
651 struct rt6_info
*next
= rt0
->dst
.rt6_next
;
653 /* no entries matched; do round-robin */
654 if (!next
|| next
->rt6i_metric
!= rt0
->rt6i_metric
)
661 net
= dev_net(rt0
->dst
.dev
);
662 return match
? match
: net
->ipv6
.ip6_null_entry
;
665 #ifdef CONFIG_IPV6_ROUTE_INFO
666 int rt6_route_rcv(struct net_device
*dev
, u8
*opt
, int len
,
667 const struct in6_addr
*gwaddr
)
669 struct net
*net
= dev_net(dev
);
670 struct route_info
*rinfo
= (struct route_info
*) opt
;
671 struct in6_addr prefix_buf
, *prefix
;
673 unsigned long lifetime
;
676 if (len
< sizeof(struct route_info
)) {
680 /* Sanity check for prefix_len and length */
681 if (rinfo
->length
> 3) {
683 } else if (rinfo
->prefix_len
> 128) {
685 } else if (rinfo
->prefix_len
> 64) {
686 if (rinfo
->length
< 2) {
689 } else if (rinfo
->prefix_len
> 0) {
690 if (rinfo
->length
< 1) {
695 pref
= rinfo
->route_pref
;
696 if (pref
== ICMPV6_ROUTER_PREF_INVALID
)
699 lifetime
= addrconf_timeout_fixup(ntohl(rinfo
->lifetime
), HZ
);
701 if (rinfo
->length
== 3)
702 prefix
= (struct in6_addr
*)rinfo
->prefix
;
704 /* this function is safe */
705 ipv6_addr_prefix(&prefix_buf
,
706 (struct in6_addr
*)rinfo
->prefix
,
708 prefix
= &prefix_buf
;
711 rt
= rt6_get_route_info(net
, prefix
, rinfo
->prefix_len
, gwaddr
,
714 if (rt
&& !lifetime
) {
720 rt
= rt6_add_route_info(net
, prefix
, rinfo
->prefix_len
, gwaddr
, dev
->ifindex
,
723 rt
->rt6i_flags
= RTF_ROUTEINFO
|
724 (rt
->rt6i_flags
& ~RTF_PREF_MASK
) | RTF_PREF(pref
);
727 if (!addrconf_finite_timeout(lifetime
))
728 rt6_clean_expires(rt
);
730 rt6_set_expires(rt
, jiffies
+ HZ
* lifetime
);
738 #define BACKTRACK(__net, saddr) \
740 if (rt == __net->ipv6.ip6_null_entry) { \
741 struct fib6_node *pn; \
743 if (fn->fn_flags & RTN_TL_ROOT) \
746 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \
747 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \
750 if (fn->fn_flags & RTN_RTINFO) \
756 static struct rt6_info
*ip6_pol_route_lookup(struct net
*net
,
757 struct fib6_table
*table
,
758 struct flowi6
*fl6
, int flags
)
760 struct fib6_node
*fn
;
763 read_lock_bh(&table
->tb6_lock
);
764 fn
= fib6_lookup(&table
->tb6_root
, &fl6
->daddr
, &fl6
->saddr
);
767 rt
= rt6_device_match(net
, rt
, &fl6
->saddr
, fl6
->flowi6_oif
, flags
);
768 if (rt
->rt6i_nsiblings
&& fl6
->flowi6_oif
== 0)
769 rt
= rt6_multipath_select(rt
, fl6
, fl6
->flowi6_oif
, flags
);
770 BACKTRACK(net
, &fl6
->saddr
);
772 dst_use(&rt
->dst
, jiffies
);
773 read_unlock_bh(&table
->tb6_lock
);
778 struct dst_entry
* ip6_route_lookup(struct net
*net
, struct flowi6
*fl6
,
781 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_lookup
);
783 EXPORT_SYMBOL_GPL(ip6_route_lookup
);
785 struct rt6_info
*rt6_lookup(struct net
*net
, const struct in6_addr
*daddr
,
786 const struct in6_addr
*saddr
, int oif
, int strict
)
788 struct flowi6 fl6
= {
792 struct dst_entry
*dst
;
793 int flags
= strict
? RT6_LOOKUP_F_IFACE
: 0;
796 memcpy(&fl6
.saddr
, saddr
, sizeof(*saddr
));
797 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
800 dst
= fib6_rule_lookup(net
, &fl6
, flags
, ip6_pol_route_lookup
);
802 return (struct rt6_info
*) dst
;
809 EXPORT_SYMBOL(rt6_lookup
);
811 /* ip6_ins_rt is called with FREE table->tb6_lock.
812 It takes new route entry, the addition fails by any reason the
813 route is freed. In any case, if caller does not hold it, it may
817 static int __ip6_ins_rt(struct rt6_info
*rt
, struct nl_info
*info
)
820 struct fib6_table
*table
;
822 table
= rt
->rt6i_table
;
823 write_lock_bh(&table
->tb6_lock
);
824 err
= fib6_add(&table
->tb6_root
, rt
, info
);
825 write_unlock_bh(&table
->tb6_lock
);
830 int ip6_ins_rt(struct rt6_info
*rt
)
832 struct nl_info info
= {
833 .nl_net
= dev_net(rt
->dst
.dev
),
835 return __ip6_ins_rt(rt
, &info
);
838 static struct rt6_info
*rt6_alloc_cow(struct rt6_info
*ort
,
839 const struct in6_addr
*daddr
,
840 const struct in6_addr
*saddr
)
848 rt
= ip6_rt_copy(ort
, daddr
);
851 if (!(rt
->rt6i_flags
& RTF_GATEWAY
)) {
852 if (ort
->rt6i_dst
.plen
!= 128 &&
853 ipv6_addr_equal(&ort
->rt6i_dst
.addr
, daddr
))
854 rt
->rt6i_flags
|= RTF_ANYCAST
;
855 rt
->rt6i_gateway
= *daddr
;
858 rt
->rt6i_flags
|= RTF_CACHE
;
860 #ifdef CONFIG_IPV6_SUBTREES
861 if (rt
->rt6i_src
.plen
&& saddr
) {
862 rt
->rt6i_src
.addr
= *saddr
;
863 rt
->rt6i_src
.plen
= 128;
871 static struct rt6_info
*rt6_alloc_clone(struct rt6_info
*ort
,
872 const struct in6_addr
*daddr
)
874 struct rt6_info
*rt
= ip6_rt_copy(ort
, daddr
);
877 rt
->rt6i_flags
|= RTF_CACHE
;
881 static struct rt6_info
*ip6_pol_route(struct net
*net
, struct fib6_table
*table
, int oif
,
882 struct flowi6
*fl6
, int flags
)
884 struct fib6_node
*fn
;
885 struct rt6_info
*rt
, *nrt
;
889 int reachable
= net
->ipv6
.devconf_all
->forwarding
? 0 : RT6_LOOKUP_F_REACHABLE
;
891 strict
|= flags
& RT6_LOOKUP_F_IFACE
;
894 read_lock_bh(&table
->tb6_lock
);
897 fn
= fib6_lookup(&table
->tb6_root
, &fl6
->daddr
, &fl6
->saddr
);
900 rt
= rt6_select(fn
, oif
, strict
| reachable
);
901 if (rt
->rt6i_nsiblings
)
902 rt
= rt6_multipath_select(rt
, fl6
, oif
, strict
| reachable
);
903 BACKTRACK(net
, &fl6
->saddr
);
904 if (rt
== net
->ipv6
.ip6_null_entry
||
905 rt
->rt6i_flags
& RTF_CACHE
)
909 read_unlock_bh(&table
->tb6_lock
);
911 if (!(rt
->rt6i_flags
& (RTF_NONEXTHOP
| RTF_GATEWAY
)))
912 nrt
= rt6_alloc_cow(rt
, &fl6
->daddr
, &fl6
->saddr
);
913 else if (!(rt
->dst
.flags
& DST_HOST
))
914 nrt
= rt6_alloc_clone(rt
, &fl6
->daddr
);
919 rt
= nrt
? : net
->ipv6
.ip6_null_entry
;
923 err
= ip6_ins_rt(nrt
);
932 * Race condition! In the gap, when table->tb6_lock was
933 * released someone could insert this route. Relookup.
944 read_unlock_bh(&table
->tb6_lock
);
946 rt
->dst
.lastuse
= jiffies
;
952 static struct rt6_info
*ip6_pol_route_input(struct net
*net
, struct fib6_table
*table
,
953 struct flowi6
*fl6
, int flags
)
955 return ip6_pol_route(net
, table
, fl6
->flowi6_iif
, fl6
, flags
);
958 static struct dst_entry
*ip6_route_input_lookup(struct net
*net
,
959 struct net_device
*dev
,
960 struct flowi6
*fl6
, int flags
)
962 if (rt6_need_strict(&fl6
->daddr
) && dev
->type
!= ARPHRD_PIMREG
)
963 flags
|= RT6_LOOKUP_F_IFACE
;
965 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_input
);
968 void ip6_route_input(struct sk_buff
*skb
)
970 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
971 struct net
*net
= dev_net(skb
->dev
);
972 int flags
= RT6_LOOKUP_F_HAS_SADDR
;
973 struct flowi6 fl6
= {
974 .flowi6_iif
= skb
->dev
->ifindex
,
977 .flowlabel
= ip6_flowinfo(iph
),
978 .flowi6_mark
= skb
->mark
,
979 .flowi6_proto
= iph
->nexthdr
,
982 skb_dst_set(skb
, ip6_route_input_lookup(net
, skb
->dev
, &fl6
, flags
));
985 static struct rt6_info
*ip6_pol_route_output(struct net
*net
, struct fib6_table
*table
,
986 struct flowi6
*fl6
, int flags
)
988 return ip6_pol_route(net
, table
, fl6
->flowi6_oif
, fl6
, flags
);
991 struct dst_entry
* ip6_route_output(struct net
*net
, const struct sock
*sk
,
996 fl6
->flowi6_iif
= LOOPBACK_IFINDEX
;
998 if ((sk
&& sk
->sk_bound_dev_if
) || rt6_need_strict(&fl6
->daddr
))
999 flags
|= RT6_LOOKUP_F_IFACE
;
1001 if (!ipv6_addr_any(&fl6
->saddr
))
1002 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
1004 flags
|= rt6_srcprefs2flags(inet6_sk(sk
)->srcprefs
);
1006 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_output
);
1009 EXPORT_SYMBOL(ip6_route_output
);
1011 struct dst_entry
*ip6_blackhole_route(struct net
*net
, struct dst_entry
*dst_orig
)
1013 struct rt6_info
*rt
, *ort
= (struct rt6_info
*) dst_orig
;
1014 struct dst_entry
*new = NULL
;
1016 rt
= dst_alloc(&ip6_dst_blackhole_ops
, ort
->dst
.dev
, 1, DST_OBSOLETE_NONE
, 0);
1020 memset(new + 1, 0, sizeof(*rt
) - sizeof(*new));
1021 rt6_init_peer(rt
, net
->ipv6
.peers
);
1024 new->input
= dst_discard
;
1025 new->output
= dst_discard
;
1027 if (dst_metrics_read_only(&ort
->dst
))
1028 new->_metrics
= ort
->dst
._metrics
;
1030 dst_copy_metrics(new, &ort
->dst
);
1031 rt
->rt6i_idev
= ort
->rt6i_idev
;
1033 in6_dev_hold(rt
->rt6i_idev
);
1035 rt
->rt6i_gateway
= ort
->rt6i_gateway
;
1036 rt
->rt6i_flags
= ort
->rt6i_flags
;
1037 rt
->rt6i_metric
= 0;
1039 memcpy(&rt
->rt6i_dst
, &ort
->rt6i_dst
, sizeof(struct rt6key
));
1040 #ifdef CONFIG_IPV6_SUBTREES
1041 memcpy(&rt
->rt6i_src
, &ort
->rt6i_src
, sizeof(struct rt6key
));
1047 dst_release(dst_orig
);
1048 return new ? new : ERR_PTR(-ENOMEM
);
1052 * Destination cache support functions
1055 static struct dst_entry
*ip6_dst_check(struct dst_entry
*dst
, u32 cookie
)
1057 struct rt6_info
*rt
;
1059 rt
= (struct rt6_info
*) dst
;
1061 /* All IPV6 dsts are created with ->obsolete set to the value
1062 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1063 * into this function always.
1065 if (rt
->rt6i_genid
!= rt_genid(dev_net(rt
->dst
.dev
)))
1068 if (rt
->rt6i_node
&& (rt
->rt6i_node
->fn_sernum
== cookie
))
1074 static struct dst_entry
*ip6_negative_advice(struct dst_entry
*dst
)
1076 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
1079 if (rt
->rt6i_flags
& RTF_CACHE
) {
1080 if (rt6_check_expired(rt
)) {
1092 static void ip6_link_failure(struct sk_buff
*skb
)
1094 struct rt6_info
*rt
;
1096 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_ADDR_UNREACH
, 0);
1098 rt
= (struct rt6_info
*) skb_dst(skb
);
1100 if (rt
->rt6i_flags
& RTF_CACHE
) {
1104 } else if (rt
->rt6i_node
&& (rt
->rt6i_flags
& RTF_DEFAULT
)) {
1105 rt
->rt6i_node
->fn_sernum
= -1;
1110 static void ip6_rt_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
1111 struct sk_buff
*skb
, u32 mtu
)
1113 struct rt6_info
*rt6
= (struct rt6_info
*)dst
;
1116 if (mtu
< dst_mtu(dst
) && rt6
->rt6i_dst
.plen
== 128) {
1117 struct net
*net
= dev_net(dst
->dev
);
1119 rt6
->rt6i_flags
|= RTF_MODIFIED
;
1120 if (mtu
< IPV6_MIN_MTU
) {
1121 u32 features
= dst_metric(dst
, RTAX_FEATURES
);
1123 features
|= RTAX_FEATURE_ALLFRAG
;
1124 dst_metric_set(dst
, RTAX_FEATURES
, features
);
1126 dst_metric_set(dst
, RTAX_MTU
, mtu
);
1127 rt6_update_expires(rt6
, net
->ipv6
.sysctl
.ip6_rt_mtu_expires
);
1131 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
,
1134 const struct ipv6hdr
*iph
= (struct ipv6hdr
*) skb
->data
;
1135 struct dst_entry
*dst
;
1138 memset(&fl6
, 0, sizeof(fl6
));
1139 fl6
.flowi6_oif
= oif
;
1140 fl6
.flowi6_mark
= mark
;
1141 fl6
.flowi6_flags
= 0;
1142 fl6
.daddr
= iph
->daddr
;
1143 fl6
.saddr
= iph
->saddr
;
1144 fl6
.flowlabel
= ip6_flowinfo(iph
);
1146 dst
= ip6_route_output(net
, NULL
, &fl6
);
1148 ip6_rt_update_pmtu(dst
, NULL
, skb
, ntohl(mtu
));
1151 EXPORT_SYMBOL_GPL(ip6_update_pmtu
);
1153 void ip6_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, __be32 mtu
)
1155 ip6_update_pmtu(skb
, sock_net(sk
), mtu
,
1156 sk
->sk_bound_dev_if
, sk
->sk_mark
);
1158 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu
);
1160 void ip6_redirect(struct sk_buff
*skb
, struct net
*net
, int oif
, u32 mark
)
1162 const struct ipv6hdr
*iph
= (struct ipv6hdr
*) skb
->data
;
1163 struct dst_entry
*dst
;
1166 memset(&fl6
, 0, sizeof(fl6
));
1167 fl6
.flowi6_oif
= oif
;
1168 fl6
.flowi6_mark
= mark
;
1169 fl6
.flowi6_flags
= 0;
1170 fl6
.daddr
= iph
->daddr
;
1171 fl6
.saddr
= iph
->saddr
;
1172 fl6
.flowlabel
= ip6_flowinfo(iph
);
1174 dst
= ip6_route_output(net
, NULL
, &fl6
);
1176 rt6_do_redirect(dst
, NULL
, skb
);
1179 EXPORT_SYMBOL_GPL(ip6_redirect
);
1181 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
)
1183 ip6_redirect(skb
, sock_net(sk
), sk
->sk_bound_dev_if
, sk
->sk_mark
);
1185 EXPORT_SYMBOL_GPL(ip6_sk_redirect
);
1187 static unsigned int ip6_default_advmss(const struct dst_entry
*dst
)
1189 struct net_device
*dev
= dst
->dev
;
1190 unsigned int mtu
= dst_mtu(dst
);
1191 struct net
*net
= dev_net(dev
);
1193 mtu
-= sizeof(struct ipv6hdr
) + sizeof(struct tcphdr
);
1195 if (mtu
< net
->ipv6
.sysctl
.ip6_rt_min_advmss
)
1196 mtu
= net
->ipv6
.sysctl
.ip6_rt_min_advmss
;
1199 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1200 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1201 * IPV6_MAXPLEN is also valid and means: "any MSS,
1202 * rely only on pmtu discovery"
1204 if (mtu
> IPV6_MAXPLEN
- sizeof(struct tcphdr
))
1209 static unsigned int ip6_mtu(const struct dst_entry
*dst
)
1211 struct inet6_dev
*idev
;
1212 unsigned int mtu
= dst_metric_raw(dst
, RTAX_MTU
);
1220 idev
= __in6_dev_get(dst
->dev
);
1222 mtu
= idev
->cnf
.mtu6
;
1228 static struct dst_entry
*icmp6_dst_gc_list
;
1229 static DEFINE_SPINLOCK(icmp6_dst_lock
);
1231 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
,
1234 struct dst_entry
*dst
;
1235 struct rt6_info
*rt
;
1236 struct inet6_dev
*idev
= in6_dev_get(dev
);
1237 struct net
*net
= dev_net(dev
);
1239 if (unlikely(!idev
))
1240 return ERR_PTR(-ENODEV
);
1242 rt
= ip6_dst_alloc(net
, dev
, 0, NULL
);
1243 if (unlikely(!rt
)) {
1245 dst
= ERR_PTR(-ENOMEM
);
1249 rt
->dst
.flags
|= DST_HOST
;
1250 rt
->dst
.output
= ip6_output
;
1251 atomic_set(&rt
->dst
.__refcnt
, 1);
1252 rt
->rt6i_dst
.addr
= fl6
->daddr
;
1253 rt
->rt6i_dst
.plen
= 128;
1254 rt
->rt6i_idev
= idev
;
1255 dst_metric_set(&rt
->dst
, RTAX_HOPLIMIT
, 0);
1257 spin_lock_bh(&icmp6_dst_lock
);
1258 rt
->dst
.next
= icmp6_dst_gc_list
;
1259 icmp6_dst_gc_list
= &rt
->dst
;
1260 spin_unlock_bh(&icmp6_dst_lock
);
1262 fib6_force_start_gc(net
);
1264 dst
= xfrm_lookup(net
, &rt
->dst
, flowi6_to_flowi(fl6
), NULL
, 0);
1270 int icmp6_dst_gc(void)
1272 struct dst_entry
*dst
, **pprev
;
1275 spin_lock_bh(&icmp6_dst_lock
);
1276 pprev
= &icmp6_dst_gc_list
;
1278 while ((dst
= *pprev
) != NULL
) {
1279 if (!atomic_read(&dst
->__refcnt
)) {
1288 spin_unlock_bh(&icmp6_dst_lock
);
1293 static void icmp6_clean_all(int (*func
)(struct rt6_info
*rt
, void *arg
),
1296 struct dst_entry
*dst
, **pprev
;
1298 spin_lock_bh(&icmp6_dst_lock
);
1299 pprev
= &icmp6_dst_gc_list
;
1300 while ((dst
= *pprev
) != NULL
) {
1301 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
1302 if (func(rt
, arg
)) {
1309 spin_unlock_bh(&icmp6_dst_lock
);
1312 static int ip6_dst_gc(struct dst_ops
*ops
)
1314 struct net
*net
= container_of(ops
, struct net
, ipv6
.ip6_dst_ops
);
1315 int rt_min_interval
= net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
1316 int rt_max_size
= net
->ipv6
.sysctl
.ip6_rt_max_size
;
1317 int rt_elasticity
= net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
;
1318 int rt_gc_timeout
= net
->ipv6
.sysctl
.ip6_rt_gc_timeout
;
1319 unsigned long rt_last_gc
= net
->ipv6
.ip6_rt_last_gc
;
1322 entries
= dst_entries_get_fast(ops
);
1323 if (time_after(rt_last_gc
+ rt_min_interval
, jiffies
) &&
1324 entries
<= rt_max_size
)
1327 net
->ipv6
.ip6_rt_gc_expire
++;
1328 fib6_run_gc(net
->ipv6
.ip6_rt_gc_expire
, net
, entries
> rt_max_size
);
1329 entries
= dst_entries_get_slow(ops
);
1330 if (entries
< ops
->gc_thresh
)
1331 net
->ipv6
.ip6_rt_gc_expire
= rt_gc_timeout
>>1;
1333 net
->ipv6
.ip6_rt_gc_expire
-= net
->ipv6
.ip6_rt_gc_expire
>>rt_elasticity
;
1334 return entries
> rt_max_size
;
1337 int ip6_dst_hoplimit(struct dst_entry
*dst
)
1339 int hoplimit
= dst_metric_raw(dst
, RTAX_HOPLIMIT
);
1340 if (hoplimit
== 0) {
1341 struct net_device
*dev
= dst
->dev
;
1342 struct inet6_dev
*idev
;
1345 idev
= __in6_dev_get(dev
);
1347 hoplimit
= idev
->cnf
.hop_limit
;
1349 hoplimit
= dev_net(dev
)->ipv6
.devconf_all
->hop_limit
;
1354 EXPORT_SYMBOL(ip6_dst_hoplimit
);
1360 int ip6_route_add(struct fib6_config
*cfg
)
1363 struct net
*net
= cfg
->fc_nlinfo
.nl_net
;
1364 struct rt6_info
*rt
= NULL
;
1365 struct net_device
*dev
= NULL
;
1366 struct inet6_dev
*idev
= NULL
;
1367 struct fib6_table
*table
;
1370 if (cfg
->fc_dst_len
> 128 || cfg
->fc_src_len
> 128)
1372 #ifndef CONFIG_IPV6_SUBTREES
1373 if (cfg
->fc_src_len
)
1376 if (cfg
->fc_ifindex
) {
1378 dev
= dev_get_by_index(net
, cfg
->fc_ifindex
);
1381 idev
= in6_dev_get(dev
);
1386 if (cfg
->fc_metric
== 0)
1387 cfg
->fc_metric
= IP6_RT_PRIO_USER
;
1390 if (cfg
->fc_nlinfo
.nlh
&&
1391 !(cfg
->fc_nlinfo
.nlh
->nlmsg_flags
& NLM_F_CREATE
)) {
1392 table
= fib6_get_table(net
, cfg
->fc_table
);
1394 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1395 table
= fib6_new_table(net
, cfg
->fc_table
);
1398 table
= fib6_new_table(net
, cfg
->fc_table
);
1404 rt
= ip6_dst_alloc(net
, NULL
, DST_NOCOUNT
, table
);
1411 if (cfg
->fc_flags
& RTF_EXPIRES
)
1412 rt6_set_expires(rt
, jiffies
+
1413 clock_t_to_jiffies(cfg
->fc_expires
));
1415 rt6_clean_expires(rt
);
1417 if (cfg
->fc_protocol
== RTPROT_UNSPEC
)
1418 cfg
->fc_protocol
= RTPROT_BOOT
;
1419 rt
->rt6i_protocol
= cfg
->fc_protocol
;
1421 addr_type
= ipv6_addr_type(&cfg
->fc_dst
);
1423 if (addr_type
& IPV6_ADDR_MULTICAST
)
1424 rt
->dst
.input
= ip6_mc_input
;
1425 else if (cfg
->fc_flags
& RTF_LOCAL
)
1426 rt
->dst
.input
= ip6_input
;
1428 rt
->dst
.input
= ip6_forward
;
1430 rt
->dst
.output
= ip6_output
;
1432 ipv6_addr_prefix(&rt
->rt6i_dst
.addr
, &cfg
->fc_dst
, cfg
->fc_dst_len
);
1433 rt
->rt6i_dst
.plen
= cfg
->fc_dst_len
;
1434 if (rt
->rt6i_dst
.plen
== 128)
1435 rt
->dst
.flags
|= DST_HOST
;
1437 if (!(rt
->dst
.flags
& DST_HOST
) && cfg
->fc_mx
) {
1438 u32
*metrics
= kzalloc(sizeof(u32
) * RTAX_MAX
, GFP_KERNEL
);
1443 dst_init_metrics(&rt
->dst
, metrics
, 0);
1445 #ifdef CONFIG_IPV6_SUBTREES
1446 ipv6_addr_prefix(&rt
->rt6i_src
.addr
, &cfg
->fc_src
, cfg
->fc_src_len
);
1447 rt
->rt6i_src
.plen
= cfg
->fc_src_len
;
1450 rt
->rt6i_metric
= cfg
->fc_metric
;
1452 /* We cannot add true routes via loopback here,
1453 they would result in kernel looping; promote them to reject routes
1455 if ((cfg
->fc_flags
& RTF_REJECT
) ||
1456 (dev
&& (dev
->flags
& IFF_LOOPBACK
) &&
1457 !(addr_type
& IPV6_ADDR_LOOPBACK
) &&
1458 !(cfg
->fc_flags
& RTF_LOCAL
))) {
1459 /* hold loopback dev/idev if we haven't done so. */
1460 if (dev
!= net
->loopback_dev
) {
1465 dev
= net
->loopback_dev
;
1467 idev
= in6_dev_get(dev
);
1473 rt
->dst
.output
= ip6_pkt_discard_out
;
1474 rt
->dst
.input
= ip6_pkt_discard
;
1475 rt
->rt6i_flags
= RTF_REJECT
|RTF_NONEXTHOP
;
1476 switch (cfg
->fc_type
) {
1478 rt
->dst
.error
= -EINVAL
;
1481 rt
->dst
.error
= -EACCES
;
1484 rt
->dst
.error
= -EAGAIN
;
1487 rt
->dst
.error
= -ENETUNREACH
;
1493 if (cfg
->fc_flags
& RTF_GATEWAY
) {
1494 const struct in6_addr
*gw_addr
;
1497 gw_addr
= &cfg
->fc_gateway
;
1498 rt
->rt6i_gateway
= *gw_addr
;
1499 gwa_type
= ipv6_addr_type(gw_addr
);
1501 if (gwa_type
!= (IPV6_ADDR_LINKLOCAL
|IPV6_ADDR_UNICAST
)) {
1502 struct rt6_info
*grt
;
1504 /* IPv6 strictly inhibits using not link-local
1505 addresses as nexthop address.
1506 Otherwise, router will not able to send redirects.
1507 It is very good, but in some (rare!) circumstances
1508 (SIT, PtP, NBMA NOARP links) it is handy to allow
1509 some exceptions. --ANK
1512 if (!(gwa_type
& IPV6_ADDR_UNICAST
))
1515 grt
= rt6_lookup(net
, gw_addr
, NULL
, cfg
->fc_ifindex
, 1);
1517 err
= -EHOSTUNREACH
;
1521 if (dev
!= grt
->dst
.dev
) {
1527 idev
= grt
->rt6i_idev
;
1529 in6_dev_hold(grt
->rt6i_idev
);
1531 if (!(grt
->rt6i_flags
& RTF_GATEWAY
))
1539 if (!dev
|| (dev
->flags
& IFF_LOOPBACK
))
1547 if (!ipv6_addr_any(&cfg
->fc_prefsrc
)) {
1548 if (!ipv6_chk_addr(net
, &cfg
->fc_prefsrc
, dev
, 0)) {
1552 rt
->rt6i_prefsrc
.addr
= cfg
->fc_prefsrc
;
1553 rt
->rt6i_prefsrc
.plen
= 128;
1555 rt
->rt6i_prefsrc
.plen
= 0;
1557 rt
->rt6i_flags
= cfg
->fc_flags
;
1564 nla_for_each_attr(nla
, cfg
->fc_mx
, cfg
->fc_mx_len
, remaining
) {
1565 int type
= nla_type(nla
);
1568 if (type
> RTAX_MAX
) {
1573 dst_metric_set(&rt
->dst
, type
, nla_get_u32(nla
));
1579 rt
->rt6i_idev
= idev
;
1580 rt
->rt6i_table
= table
;
1582 cfg
->fc_nlinfo
.nl_net
= dev_net(dev
);
1584 return __ip6_ins_rt(rt
, &cfg
->fc_nlinfo
);
1596 static int __ip6_del_rt(struct rt6_info
*rt
, struct nl_info
*info
)
1599 struct fib6_table
*table
;
1600 struct net
*net
= dev_net(rt
->dst
.dev
);
1602 if (rt
== net
->ipv6
.ip6_null_entry
) {
1607 table
= rt
->rt6i_table
;
1608 write_lock_bh(&table
->tb6_lock
);
1609 err
= fib6_del(rt
, info
);
1610 write_unlock_bh(&table
->tb6_lock
);
1617 int ip6_del_rt(struct rt6_info
*rt
)
1619 struct nl_info info
= {
1620 .nl_net
= dev_net(rt
->dst
.dev
),
1622 return __ip6_del_rt(rt
, &info
);
1625 static int ip6_route_del(struct fib6_config
*cfg
)
1627 struct fib6_table
*table
;
1628 struct fib6_node
*fn
;
1629 struct rt6_info
*rt
;
1632 table
= fib6_get_table(cfg
->fc_nlinfo
.nl_net
, cfg
->fc_table
);
1636 read_lock_bh(&table
->tb6_lock
);
1638 fn
= fib6_locate(&table
->tb6_root
,
1639 &cfg
->fc_dst
, cfg
->fc_dst_len
,
1640 &cfg
->fc_src
, cfg
->fc_src_len
);
1643 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1644 if (cfg
->fc_ifindex
&&
1646 rt
->dst
.dev
->ifindex
!= cfg
->fc_ifindex
))
1648 if (cfg
->fc_flags
& RTF_GATEWAY
&&
1649 !ipv6_addr_equal(&cfg
->fc_gateway
, &rt
->rt6i_gateway
))
1651 if (cfg
->fc_metric
&& cfg
->fc_metric
!= rt
->rt6i_metric
)
1654 read_unlock_bh(&table
->tb6_lock
);
1656 return __ip6_del_rt(rt
, &cfg
->fc_nlinfo
);
1659 read_unlock_bh(&table
->tb6_lock
);
1664 static void rt6_do_redirect(struct dst_entry
*dst
, struct sock
*sk
, struct sk_buff
*skb
)
1666 struct net
*net
= dev_net(skb
->dev
);
1667 struct netevent_redirect netevent
;
1668 struct rt6_info
*rt
, *nrt
= NULL
;
1669 struct ndisc_options ndopts
;
1670 struct inet6_dev
*in6_dev
;
1671 struct neighbour
*neigh
;
1673 int optlen
, on_link
;
1676 optlen
= skb_tail_pointer(skb
) - skb_transport_header(skb
);
1677 optlen
-= sizeof(*msg
);
1680 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1684 msg
= (struct rd_msg
*)icmp6_hdr(skb
);
1686 if (ipv6_addr_is_multicast(&msg
->dest
)) {
1687 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1692 if (ipv6_addr_equal(&msg
->dest
, &msg
->target
)) {
1694 } else if (ipv6_addr_type(&msg
->target
) !=
1695 (IPV6_ADDR_UNICAST
|IPV6_ADDR_LINKLOCAL
)) {
1696 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1700 in6_dev
= __in6_dev_get(skb
->dev
);
1703 if (in6_dev
->cnf
.forwarding
|| !in6_dev
->cnf
.accept_redirects
)
1707 * The IP source address of the Redirect MUST be the same as the current
1708 * first-hop router for the specified ICMP Destination Address.
1711 if (!ndisc_parse_options(msg
->opt
, optlen
, &ndopts
)) {
1712 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1717 if (ndopts
.nd_opts_tgt_lladdr
) {
1718 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_tgt_lladdr
,
1721 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1726 rt
= (struct rt6_info
*) dst
;
1727 if (rt
== net
->ipv6
.ip6_null_entry
) {
1728 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1732 /* Redirect received -> path was valid.
1733 * Look, redirects are sent only in response to data packets,
1734 * so that this nexthop apparently is reachable. --ANK
1736 dst_confirm(&rt
->dst
);
1738 neigh
= __neigh_lookup(&nd_tbl
, &msg
->target
, skb
->dev
, 1);
1743 * We have finally decided to accept it.
1746 neigh_update(neigh
, lladdr
, NUD_STALE
,
1747 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
1748 NEIGH_UPDATE_F_OVERRIDE
|
1749 (on_link
? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER
|
1750 NEIGH_UPDATE_F_ISROUTER
))
1753 nrt
= ip6_rt_copy(rt
, &msg
->dest
);
1757 nrt
->rt6i_flags
= RTF_GATEWAY
|RTF_UP
|RTF_DYNAMIC
|RTF_CACHE
;
1759 nrt
->rt6i_flags
&= ~RTF_GATEWAY
;
1761 nrt
->rt6i_gateway
= *(struct in6_addr
*)neigh
->primary_key
;
1763 if (ip6_ins_rt(nrt
))
1766 netevent
.old
= &rt
->dst
;
1767 netevent
.new = &nrt
->dst
;
1768 netevent
.daddr
= &msg
->dest
;
1769 netevent
.neigh
= neigh
;
1770 call_netevent_notifiers(NETEVENT_REDIRECT
, &netevent
);
1772 if (rt
->rt6i_flags
& RTF_CACHE
) {
1773 rt
= (struct rt6_info
*) dst_clone(&rt
->dst
);
1778 neigh_release(neigh
);
1782 * Misc support functions
1785 static struct rt6_info
*ip6_rt_copy(struct rt6_info
*ort
,
1786 const struct in6_addr
*dest
)
1788 struct net
*net
= dev_net(ort
->dst
.dev
);
1789 struct rt6_info
*rt
= ip6_dst_alloc(net
, ort
->dst
.dev
, 0,
1793 rt
->dst
.input
= ort
->dst
.input
;
1794 rt
->dst
.output
= ort
->dst
.output
;
1795 rt
->dst
.flags
|= DST_HOST
;
1797 rt
->rt6i_dst
.addr
= *dest
;
1798 rt
->rt6i_dst
.plen
= 128;
1799 dst_copy_metrics(&rt
->dst
, &ort
->dst
);
1800 rt
->dst
.error
= ort
->dst
.error
;
1801 rt
->rt6i_idev
= ort
->rt6i_idev
;
1803 in6_dev_hold(rt
->rt6i_idev
);
1804 rt
->dst
.lastuse
= jiffies
;
1806 rt
->rt6i_gateway
= ort
->rt6i_gateway
;
1807 rt
->rt6i_flags
= ort
->rt6i_flags
;
1808 if ((ort
->rt6i_flags
& (RTF_DEFAULT
| RTF_ADDRCONF
)) ==
1809 (RTF_DEFAULT
| RTF_ADDRCONF
))
1810 rt6_set_from(rt
, ort
);
1811 rt
->rt6i_metric
= 0;
1813 #ifdef CONFIG_IPV6_SUBTREES
1814 memcpy(&rt
->rt6i_src
, &ort
->rt6i_src
, sizeof(struct rt6key
));
1816 memcpy(&rt
->rt6i_prefsrc
, &ort
->rt6i_prefsrc
, sizeof(struct rt6key
));
1817 rt
->rt6i_table
= ort
->rt6i_table
;
1822 #ifdef CONFIG_IPV6_ROUTE_INFO
1823 static struct rt6_info
*rt6_get_route_info(struct net
*net
,
1824 const struct in6_addr
*prefix
, int prefixlen
,
1825 const struct in6_addr
*gwaddr
, int ifindex
)
1827 struct fib6_node
*fn
;
1828 struct rt6_info
*rt
= NULL
;
1829 struct fib6_table
*table
;
1831 table
= fib6_get_table(net
, RT6_TABLE_INFO
);
1835 read_lock_bh(&table
->tb6_lock
);
1836 fn
= fib6_locate(&table
->tb6_root
, prefix
,prefixlen
, NULL
, 0);
1840 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1841 if (rt
->dst
.dev
->ifindex
!= ifindex
)
1843 if ((rt
->rt6i_flags
& (RTF_ROUTEINFO
|RTF_GATEWAY
)) != (RTF_ROUTEINFO
|RTF_GATEWAY
))
1845 if (!ipv6_addr_equal(&rt
->rt6i_gateway
, gwaddr
))
1851 read_unlock_bh(&table
->tb6_lock
);
1855 static struct rt6_info
*rt6_add_route_info(struct net
*net
,
1856 const struct in6_addr
*prefix
, int prefixlen
,
1857 const struct in6_addr
*gwaddr
, int ifindex
,
1860 struct fib6_config cfg
= {
1861 .fc_table
= RT6_TABLE_INFO
,
1862 .fc_metric
= IP6_RT_PRIO_USER
,
1863 .fc_ifindex
= ifindex
,
1864 .fc_dst_len
= prefixlen
,
1865 .fc_flags
= RTF_GATEWAY
| RTF_ADDRCONF
| RTF_ROUTEINFO
|
1866 RTF_UP
| RTF_PREF(pref
),
1867 .fc_nlinfo
.portid
= 0,
1868 .fc_nlinfo
.nlh
= NULL
,
1869 .fc_nlinfo
.nl_net
= net
,
1872 cfg
.fc_dst
= *prefix
;
1873 cfg
.fc_gateway
= *gwaddr
;
1875 /* We should treat it as a default route if prefix length is 0. */
1877 cfg
.fc_flags
|= RTF_DEFAULT
;
1879 ip6_route_add(&cfg
);
1881 return rt6_get_route_info(net
, prefix
, prefixlen
, gwaddr
, ifindex
);
1885 struct rt6_info
*rt6_get_dflt_router(const struct in6_addr
*addr
, struct net_device
*dev
)
1887 struct rt6_info
*rt
;
1888 struct fib6_table
*table
;
1890 table
= fib6_get_table(dev_net(dev
), RT6_TABLE_DFLT
);
1894 read_lock_bh(&table
->tb6_lock
);
1895 for (rt
= table
->tb6_root
.leaf
; rt
; rt
=rt
->dst
.rt6_next
) {
1896 if (dev
== rt
->dst
.dev
&&
1897 ((rt
->rt6i_flags
& (RTF_ADDRCONF
| RTF_DEFAULT
)) == (RTF_ADDRCONF
| RTF_DEFAULT
)) &&
1898 ipv6_addr_equal(&rt
->rt6i_gateway
, addr
))
1903 read_unlock_bh(&table
->tb6_lock
);
1907 struct rt6_info
*rt6_add_dflt_router(const struct in6_addr
*gwaddr
,
1908 struct net_device
*dev
,
1911 struct fib6_config cfg
= {
1912 .fc_table
= RT6_TABLE_DFLT
,
1913 .fc_metric
= IP6_RT_PRIO_USER
,
1914 .fc_ifindex
= dev
->ifindex
,
1915 .fc_flags
= RTF_GATEWAY
| RTF_ADDRCONF
| RTF_DEFAULT
|
1916 RTF_UP
| RTF_EXPIRES
| RTF_PREF(pref
),
1917 .fc_nlinfo
.portid
= 0,
1918 .fc_nlinfo
.nlh
= NULL
,
1919 .fc_nlinfo
.nl_net
= dev_net(dev
),
1922 cfg
.fc_gateway
= *gwaddr
;
1924 ip6_route_add(&cfg
);
1926 return rt6_get_dflt_router(gwaddr
, dev
);
1929 void rt6_purge_dflt_routers(struct net
*net
)
1931 struct rt6_info
*rt
;
1932 struct fib6_table
*table
;
1934 /* NOTE: Keep consistent with rt6_get_dflt_router */
1935 table
= fib6_get_table(net
, RT6_TABLE_DFLT
);
1940 read_lock_bh(&table
->tb6_lock
);
1941 for (rt
= table
->tb6_root
.leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1942 if (rt
->rt6i_flags
& (RTF_DEFAULT
| RTF_ADDRCONF
) &&
1943 (!rt
->rt6i_idev
|| rt
->rt6i_idev
->cnf
.accept_ra
!= 2)) {
1945 read_unlock_bh(&table
->tb6_lock
);
1950 read_unlock_bh(&table
->tb6_lock
);
1953 static void rtmsg_to_fib6_config(struct net
*net
,
1954 struct in6_rtmsg
*rtmsg
,
1955 struct fib6_config
*cfg
)
1957 memset(cfg
, 0, sizeof(*cfg
));
1959 cfg
->fc_table
= RT6_TABLE_MAIN
;
1960 cfg
->fc_ifindex
= rtmsg
->rtmsg_ifindex
;
1961 cfg
->fc_metric
= rtmsg
->rtmsg_metric
;
1962 cfg
->fc_expires
= rtmsg
->rtmsg_info
;
1963 cfg
->fc_dst_len
= rtmsg
->rtmsg_dst_len
;
1964 cfg
->fc_src_len
= rtmsg
->rtmsg_src_len
;
1965 cfg
->fc_flags
= rtmsg
->rtmsg_flags
;
1967 cfg
->fc_nlinfo
.nl_net
= net
;
1969 cfg
->fc_dst
= rtmsg
->rtmsg_dst
;
1970 cfg
->fc_src
= rtmsg
->rtmsg_src
;
1971 cfg
->fc_gateway
= rtmsg
->rtmsg_gateway
;
1974 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
1976 struct fib6_config cfg
;
1977 struct in6_rtmsg rtmsg
;
1981 case SIOCADDRT
: /* Add a route */
1982 case SIOCDELRT
: /* Delete a route */
1983 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
1985 err
= copy_from_user(&rtmsg
, arg
,
1986 sizeof(struct in6_rtmsg
));
1990 rtmsg_to_fib6_config(net
, &rtmsg
, &cfg
);
1995 err
= ip6_route_add(&cfg
);
1998 err
= ip6_route_del(&cfg
);
2012 * Drop the packet on the floor
2015 static int ip6_pkt_drop(struct sk_buff
*skb
, u8 code
, int ipstats_mib_noroutes
)
2018 struct dst_entry
*dst
= skb_dst(skb
);
2019 switch (ipstats_mib_noroutes
) {
2020 case IPSTATS_MIB_INNOROUTES
:
2021 type
= ipv6_addr_type(&ipv6_hdr(skb
)->daddr
);
2022 if (type
== IPV6_ADDR_ANY
) {
2023 IP6_INC_STATS(dev_net(dst
->dev
), ip6_dst_idev(dst
),
2024 IPSTATS_MIB_INADDRERRORS
);
2028 case IPSTATS_MIB_OUTNOROUTES
:
2029 IP6_INC_STATS(dev_net(dst
->dev
), ip6_dst_idev(dst
),
2030 ipstats_mib_noroutes
);
2033 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, code
, 0);
2038 static int ip6_pkt_discard(struct sk_buff
*skb
)
2040 return ip6_pkt_drop(skb
, ICMPV6_NOROUTE
, IPSTATS_MIB_INNOROUTES
);
2043 static int ip6_pkt_discard_out(struct sk_buff
*skb
)
2045 skb
->dev
= skb_dst(skb
)->dev
;
2046 return ip6_pkt_drop(skb
, ICMPV6_NOROUTE
, IPSTATS_MIB_OUTNOROUTES
);
2049 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2051 static int ip6_pkt_prohibit(struct sk_buff
*skb
)
2053 return ip6_pkt_drop(skb
, ICMPV6_ADM_PROHIBITED
, IPSTATS_MIB_INNOROUTES
);
2056 static int ip6_pkt_prohibit_out(struct sk_buff
*skb
)
2058 skb
->dev
= skb_dst(skb
)->dev
;
2059 return ip6_pkt_drop(skb
, ICMPV6_ADM_PROHIBITED
, IPSTATS_MIB_OUTNOROUTES
);
2065 * Allocate a dst for local (unicast / anycast) address.
2068 struct rt6_info
*addrconf_dst_alloc(struct inet6_dev
*idev
,
2069 const struct in6_addr
*addr
,
2072 struct net
*net
= dev_net(idev
->dev
);
2073 struct rt6_info
*rt
= ip6_dst_alloc(net
, net
->loopback_dev
, 0, NULL
);
2076 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n");
2077 return ERR_PTR(-ENOMEM
);
2082 rt
->dst
.flags
|= DST_HOST
;
2083 rt
->dst
.input
= ip6_input
;
2084 rt
->dst
.output
= ip6_output
;
2085 rt
->rt6i_idev
= idev
;
2087 rt
->rt6i_flags
= RTF_UP
| RTF_NONEXTHOP
;
2089 rt
->rt6i_flags
|= RTF_ANYCAST
;
2091 rt
->rt6i_flags
|= RTF_LOCAL
;
2093 rt
->rt6i_dst
.addr
= *addr
;
2094 rt
->rt6i_dst
.plen
= 128;
2095 rt
->rt6i_table
= fib6_get_table(net
, RT6_TABLE_LOCAL
);
2097 atomic_set(&rt
->dst
.__refcnt
, 1);
2102 int ip6_route_get_saddr(struct net
*net
,
2103 struct rt6_info
*rt
,
2104 const struct in6_addr
*daddr
,
2106 struct in6_addr
*saddr
)
2108 struct inet6_dev
*idev
= ip6_dst_idev((struct dst_entry
*)rt
);
2110 if (rt
->rt6i_prefsrc
.plen
)
2111 *saddr
= rt
->rt6i_prefsrc
.addr
;
2113 err
= ipv6_dev_get_saddr(net
, idev
? idev
->dev
: NULL
,
2114 daddr
, prefs
, saddr
);
2118 /* remove deleted ip from prefsrc entries */
2119 struct arg_dev_net_ip
{
2120 struct net_device
*dev
;
2122 struct in6_addr
*addr
;
2125 static int fib6_remove_prefsrc(struct rt6_info
*rt
, void *arg
)
2127 struct net_device
*dev
= ((struct arg_dev_net_ip
*)arg
)->dev
;
2128 struct net
*net
= ((struct arg_dev_net_ip
*)arg
)->net
;
2129 struct in6_addr
*addr
= ((struct arg_dev_net_ip
*)arg
)->addr
;
2131 if (((void *)rt
->dst
.dev
== dev
|| !dev
) &&
2132 rt
!= net
->ipv6
.ip6_null_entry
&&
2133 ipv6_addr_equal(addr
, &rt
->rt6i_prefsrc
.addr
)) {
2134 /* remove prefsrc entry */
2135 rt
->rt6i_prefsrc
.plen
= 0;
2140 void rt6_remove_prefsrc(struct inet6_ifaddr
*ifp
)
2142 struct net
*net
= dev_net(ifp
->idev
->dev
);
2143 struct arg_dev_net_ip adni
= {
2144 .dev
= ifp
->idev
->dev
,
2148 fib6_clean_all(net
, fib6_remove_prefsrc
, 0, &adni
);
2151 struct arg_dev_net
{
2152 struct net_device
*dev
;
2156 static int fib6_ifdown(struct rt6_info
*rt
, void *arg
)
2158 const struct arg_dev_net
*adn
= arg
;
2159 const struct net_device
*dev
= adn
->dev
;
2161 if ((rt
->dst
.dev
== dev
|| !dev
) &&
2162 rt
!= adn
->net
->ipv6
.ip6_null_entry
)
2168 void rt6_ifdown(struct net
*net
, struct net_device
*dev
)
2170 struct arg_dev_net adn
= {
2175 fib6_clean_all(net
, fib6_ifdown
, 0, &adn
);
2176 icmp6_clean_all(fib6_ifdown
, &adn
);
2179 struct rt6_mtu_change_arg
{
2180 struct net_device
*dev
;
2184 static int rt6_mtu_change_route(struct rt6_info
*rt
, void *p_arg
)
2186 struct rt6_mtu_change_arg
*arg
= (struct rt6_mtu_change_arg
*) p_arg
;
2187 struct inet6_dev
*idev
;
2189 /* In IPv6 pmtu discovery is not optional,
2190 so that RTAX_MTU lock cannot disable it.
2191 We still use this lock to block changes
2192 caused by addrconf/ndisc.
2195 idev
= __in6_dev_get(arg
->dev
);
2199 /* For administrative MTU increase, there is no way to discover
2200 IPv6 PMTU increase, so PMTU increase should be updated here.
2201 Since RFC 1981 doesn't include administrative MTU increase
2202 update PMTU increase is a MUST. (i.e. jumbo frame)
2205 If new MTU is less than route PMTU, this new MTU will be the
2206 lowest MTU in the path, update the route PMTU to reflect PMTU
2207 decreases; if new MTU is greater than route PMTU, and the
2208 old MTU is the lowest MTU in the path, update the route PMTU
2209 to reflect the increase. In this case if the other nodes' MTU
2210 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2213 if (rt
->dst
.dev
== arg
->dev
&&
2214 !dst_metric_locked(&rt
->dst
, RTAX_MTU
) &&
2215 (dst_mtu(&rt
->dst
) >= arg
->mtu
||
2216 (dst_mtu(&rt
->dst
) < arg
->mtu
&&
2217 dst_mtu(&rt
->dst
) == idev
->cnf
.mtu6
))) {
2218 dst_metric_set(&rt
->dst
, RTAX_MTU
, arg
->mtu
);
2223 void rt6_mtu_change(struct net_device
*dev
, unsigned int mtu
)
2225 struct rt6_mtu_change_arg arg
= {
2230 fib6_clean_all(dev_net(dev
), rt6_mtu_change_route
, 0, &arg
);
2233 static const struct nla_policy rtm_ipv6_policy
[RTA_MAX
+1] = {
2234 [RTA_GATEWAY
] = { .len
= sizeof(struct in6_addr
) },
2235 [RTA_OIF
] = { .type
= NLA_U32
},
2236 [RTA_IIF
] = { .type
= NLA_U32
},
2237 [RTA_PRIORITY
] = { .type
= NLA_U32
},
2238 [RTA_METRICS
] = { .type
= NLA_NESTED
},
2239 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
2242 static int rtm_to_fib6_config(struct sk_buff
*skb
, struct nlmsghdr
*nlh
,
2243 struct fib6_config
*cfg
)
2246 struct nlattr
*tb
[RTA_MAX
+1];
2249 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv6_policy
);
2254 rtm
= nlmsg_data(nlh
);
2255 memset(cfg
, 0, sizeof(*cfg
));
2257 cfg
->fc_table
= rtm
->rtm_table
;
2258 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
2259 cfg
->fc_src_len
= rtm
->rtm_src_len
;
2260 cfg
->fc_flags
= RTF_UP
;
2261 cfg
->fc_protocol
= rtm
->rtm_protocol
;
2262 cfg
->fc_type
= rtm
->rtm_type
;
2264 if (rtm
->rtm_type
== RTN_UNREACHABLE
||
2265 rtm
->rtm_type
== RTN_BLACKHOLE
||
2266 rtm
->rtm_type
== RTN_PROHIBIT
||
2267 rtm
->rtm_type
== RTN_THROW
)
2268 cfg
->fc_flags
|= RTF_REJECT
;
2270 if (rtm
->rtm_type
== RTN_LOCAL
)
2271 cfg
->fc_flags
|= RTF_LOCAL
;
2273 cfg
->fc_nlinfo
.portid
= NETLINK_CB(skb
).portid
;
2274 cfg
->fc_nlinfo
.nlh
= nlh
;
2275 cfg
->fc_nlinfo
.nl_net
= sock_net(skb
->sk
);
2277 if (tb
[RTA_GATEWAY
]) {
2278 nla_memcpy(&cfg
->fc_gateway
, tb
[RTA_GATEWAY
], 16);
2279 cfg
->fc_flags
|= RTF_GATEWAY
;
2283 int plen
= (rtm
->rtm_dst_len
+ 7) >> 3;
2285 if (nla_len(tb
[RTA_DST
]) < plen
)
2288 nla_memcpy(&cfg
->fc_dst
, tb
[RTA_DST
], plen
);
2292 int plen
= (rtm
->rtm_src_len
+ 7) >> 3;
2294 if (nla_len(tb
[RTA_SRC
]) < plen
)
2297 nla_memcpy(&cfg
->fc_src
, tb
[RTA_SRC
], plen
);
2300 if (tb
[RTA_PREFSRC
])
2301 nla_memcpy(&cfg
->fc_prefsrc
, tb
[RTA_PREFSRC
], 16);
2304 cfg
->fc_ifindex
= nla_get_u32(tb
[RTA_OIF
]);
2306 if (tb
[RTA_PRIORITY
])
2307 cfg
->fc_metric
= nla_get_u32(tb
[RTA_PRIORITY
]);
2309 if (tb
[RTA_METRICS
]) {
2310 cfg
->fc_mx
= nla_data(tb
[RTA_METRICS
]);
2311 cfg
->fc_mx_len
= nla_len(tb
[RTA_METRICS
]);
2315 cfg
->fc_table
= nla_get_u32(tb
[RTA_TABLE
]);
2317 if (tb
[RTA_MULTIPATH
]) {
2318 cfg
->fc_mp
= nla_data(tb
[RTA_MULTIPATH
]);
2319 cfg
->fc_mp_len
= nla_len(tb
[RTA_MULTIPATH
]);
2327 static int ip6_route_multipath(struct fib6_config
*cfg
, int add
)
2329 struct fib6_config r_cfg
;
2330 struct rtnexthop
*rtnh
;
2333 int err
= 0, last_err
= 0;
2336 rtnh
= (struct rtnexthop
*)cfg
->fc_mp
;
2337 remaining
= cfg
->fc_mp_len
;
2339 /* Parse a Multipath Entry */
2340 while (rtnh_ok(rtnh
, remaining
)) {
2341 memcpy(&r_cfg
, cfg
, sizeof(*cfg
));
2342 if (rtnh
->rtnh_ifindex
)
2343 r_cfg
.fc_ifindex
= rtnh
->rtnh_ifindex
;
2345 attrlen
= rtnh_attrlen(rtnh
);
2347 struct nlattr
*nla
, *attrs
= rtnh_attrs(rtnh
);
2349 nla
= nla_find(attrs
, attrlen
, RTA_GATEWAY
);
2351 nla_memcpy(&r_cfg
.fc_gateway
, nla
, 16);
2352 r_cfg
.fc_flags
|= RTF_GATEWAY
;
2355 err
= add
? ip6_route_add(&r_cfg
) : ip6_route_del(&r_cfg
);
2358 /* If we are trying to remove a route, do not stop the
2359 * loop when ip6_route_del() fails (because next hop is
2360 * already gone), we should try to remove all next hops.
2363 /* If add fails, we should try to delete all
2364 * next hops that have been already added.
2370 /* Because each route is added like a single route we remove
2371 * this flag after the first nexthop (if there is a collision,
2372 * we have already fail to add the first nexthop:
2373 * fib6_add_rt2node() has reject it).
2375 cfg
->fc_nlinfo
.nlh
->nlmsg_flags
&= ~NLM_F_EXCL
;
2376 rtnh
= rtnh_next(rtnh
, &remaining
);
2382 static int inet6_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
* nlh
)
2384 struct fib6_config cfg
;
2387 err
= rtm_to_fib6_config(skb
, nlh
, &cfg
);
2392 return ip6_route_multipath(&cfg
, 0);
2394 return ip6_route_del(&cfg
);
2397 static int inet6_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
* nlh
)
2399 struct fib6_config cfg
;
2402 err
= rtm_to_fib6_config(skb
, nlh
, &cfg
);
2407 return ip6_route_multipath(&cfg
, 1);
2409 return ip6_route_add(&cfg
);
2412 static inline size_t rt6_nlmsg_size(void)
2414 return NLMSG_ALIGN(sizeof(struct rtmsg
))
2415 + nla_total_size(16) /* RTA_SRC */
2416 + nla_total_size(16) /* RTA_DST */
2417 + nla_total_size(16) /* RTA_GATEWAY */
2418 + nla_total_size(16) /* RTA_PREFSRC */
2419 + nla_total_size(4) /* RTA_TABLE */
2420 + nla_total_size(4) /* RTA_IIF */
2421 + nla_total_size(4) /* RTA_OIF */
2422 + nla_total_size(4) /* RTA_PRIORITY */
2423 + RTAX_MAX
* nla_total_size(4) /* RTA_METRICS */
2424 + nla_total_size(sizeof(struct rta_cacheinfo
));
2427 static int rt6_fill_node(struct net
*net
,
2428 struct sk_buff
*skb
, struct rt6_info
*rt
,
2429 struct in6_addr
*dst
, struct in6_addr
*src
,
2430 int iif
, int type
, u32 portid
, u32 seq
,
2431 int prefix
, int nowait
, unsigned int flags
)
2434 struct nlmsghdr
*nlh
;
2438 if (prefix
) { /* user wants prefix routes only */
2439 if (!(rt
->rt6i_flags
& RTF_PREFIX_RT
)) {
2440 /* success since this is not a prefix route */
2445 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(*rtm
), flags
);
2449 rtm
= nlmsg_data(nlh
);
2450 rtm
->rtm_family
= AF_INET6
;
2451 rtm
->rtm_dst_len
= rt
->rt6i_dst
.plen
;
2452 rtm
->rtm_src_len
= rt
->rt6i_src
.plen
;
2455 table
= rt
->rt6i_table
->tb6_id
;
2457 table
= RT6_TABLE_UNSPEC
;
2458 rtm
->rtm_table
= table
;
2459 if (nla_put_u32(skb
, RTA_TABLE
, table
))
2460 goto nla_put_failure
;
2461 if (rt
->rt6i_flags
& RTF_REJECT
) {
2462 switch (rt
->dst
.error
) {
2464 rtm
->rtm_type
= RTN_BLACKHOLE
;
2467 rtm
->rtm_type
= RTN_PROHIBIT
;
2470 rtm
->rtm_type
= RTN_THROW
;
2473 rtm
->rtm_type
= RTN_UNREACHABLE
;
2477 else if (rt
->rt6i_flags
& RTF_LOCAL
)
2478 rtm
->rtm_type
= RTN_LOCAL
;
2479 else if (rt
->dst
.dev
&& (rt
->dst
.dev
->flags
& IFF_LOOPBACK
))
2480 rtm
->rtm_type
= RTN_LOCAL
;
2482 rtm
->rtm_type
= RTN_UNICAST
;
2484 rtm
->rtm_scope
= RT_SCOPE_UNIVERSE
;
2485 rtm
->rtm_protocol
= rt
->rt6i_protocol
;
2486 if (rt
->rt6i_flags
& RTF_DYNAMIC
)
2487 rtm
->rtm_protocol
= RTPROT_REDIRECT
;
2488 else if (rt
->rt6i_flags
& RTF_ADDRCONF
) {
2489 if (rt
->rt6i_flags
& (RTF_DEFAULT
| RTF_ROUTEINFO
))
2490 rtm
->rtm_protocol
= RTPROT_RA
;
2492 rtm
->rtm_protocol
= RTPROT_KERNEL
;
2495 if (rt
->rt6i_flags
& RTF_CACHE
)
2496 rtm
->rtm_flags
|= RTM_F_CLONED
;
2499 if (nla_put(skb
, RTA_DST
, 16, dst
))
2500 goto nla_put_failure
;
2501 rtm
->rtm_dst_len
= 128;
2502 } else if (rtm
->rtm_dst_len
)
2503 if (nla_put(skb
, RTA_DST
, 16, &rt
->rt6i_dst
.addr
))
2504 goto nla_put_failure
;
2505 #ifdef CONFIG_IPV6_SUBTREES
2507 if (nla_put(skb
, RTA_SRC
, 16, src
))
2508 goto nla_put_failure
;
2509 rtm
->rtm_src_len
= 128;
2510 } else if (rtm
->rtm_src_len
&&
2511 nla_put(skb
, RTA_SRC
, 16, &rt
->rt6i_src
.addr
))
2512 goto nla_put_failure
;
2515 #ifdef CONFIG_IPV6_MROUTE
2516 if (ipv6_addr_is_multicast(&rt
->rt6i_dst
.addr
)) {
2517 int err
= ip6mr_get_route(net
, skb
, rtm
, nowait
);
2522 goto nla_put_failure
;
2524 if (err
== -EMSGSIZE
)
2525 goto nla_put_failure
;
2530 if (nla_put_u32(skb
, RTA_IIF
, iif
))
2531 goto nla_put_failure
;
2533 struct in6_addr saddr_buf
;
2534 if (ip6_route_get_saddr(net
, rt
, dst
, 0, &saddr_buf
) == 0 &&
2535 nla_put(skb
, RTA_PREFSRC
, 16, &saddr_buf
))
2536 goto nla_put_failure
;
2539 if (rt
->rt6i_prefsrc
.plen
) {
2540 struct in6_addr saddr_buf
;
2541 saddr_buf
= rt
->rt6i_prefsrc
.addr
;
2542 if (nla_put(skb
, RTA_PREFSRC
, 16, &saddr_buf
))
2543 goto nla_put_failure
;
2546 if (rtnetlink_put_metrics(skb
, dst_metrics_ptr(&rt
->dst
)) < 0)
2547 goto nla_put_failure
;
2549 if (rt
->rt6i_flags
& RTF_GATEWAY
) {
2550 if (nla_put(skb
, RTA_GATEWAY
, 16, &rt
->rt6i_gateway
) < 0)
2551 goto nla_put_failure
;
2555 nla_put_u32(skb
, RTA_OIF
, rt
->dst
.dev
->ifindex
))
2556 goto nla_put_failure
;
2557 if (nla_put_u32(skb
, RTA_PRIORITY
, rt
->rt6i_metric
))
2558 goto nla_put_failure
;
2560 expires
= (rt
->rt6i_flags
& RTF_EXPIRES
) ? rt
->dst
.expires
- jiffies
: 0;
2562 if (rtnl_put_cacheinfo(skb
, &rt
->dst
, 0, expires
, rt
->dst
.error
) < 0)
2563 goto nla_put_failure
;
2565 return nlmsg_end(skb
, nlh
);
2568 nlmsg_cancel(skb
, nlh
);
2572 int rt6_dump_route(struct rt6_info
*rt
, void *p_arg
)
2574 struct rt6_rtnl_dump_arg
*arg
= (struct rt6_rtnl_dump_arg
*) p_arg
;
2577 if (nlmsg_len(arg
->cb
->nlh
) >= sizeof(struct rtmsg
)) {
2578 struct rtmsg
*rtm
= nlmsg_data(arg
->cb
->nlh
);
2579 prefix
= (rtm
->rtm_flags
& RTM_F_PREFIX
) != 0;
2583 return rt6_fill_node(arg
->net
,
2584 arg
->skb
, rt
, NULL
, NULL
, 0, RTM_NEWROUTE
,
2585 NETLINK_CB(arg
->cb
->skb
).portid
, arg
->cb
->nlh
->nlmsg_seq
,
2586 prefix
, 0, NLM_F_MULTI
);
2589 static int inet6_rtm_getroute(struct sk_buff
*in_skb
, struct nlmsghdr
* nlh
)
2591 struct net
*net
= sock_net(in_skb
->sk
);
2592 struct nlattr
*tb
[RTA_MAX
+1];
2593 struct rt6_info
*rt
;
2594 struct sk_buff
*skb
;
2597 int err
, iif
= 0, oif
= 0;
2599 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv6_policy
);
2604 memset(&fl6
, 0, sizeof(fl6
));
2607 if (nla_len(tb
[RTA_SRC
]) < sizeof(struct in6_addr
))
2610 fl6
.saddr
= *(struct in6_addr
*)nla_data(tb
[RTA_SRC
]);
2614 if (nla_len(tb
[RTA_DST
]) < sizeof(struct in6_addr
))
2617 fl6
.daddr
= *(struct in6_addr
*)nla_data(tb
[RTA_DST
]);
2621 iif
= nla_get_u32(tb
[RTA_IIF
]);
2624 oif
= nla_get_u32(tb
[RTA_OIF
]);
2627 struct net_device
*dev
;
2630 dev
= __dev_get_by_index(net
, iif
);
2636 fl6
.flowi6_iif
= iif
;
2638 if (!ipv6_addr_any(&fl6
.saddr
))
2639 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
2641 rt
= (struct rt6_info
*)ip6_route_input_lookup(net
, dev
, &fl6
,
2644 fl6
.flowi6_oif
= oif
;
2646 rt
= (struct rt6_info
*)ip6_route_output(net
, NULL
, &fl6
);
2649 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2656 /* Reserve room for dummy headers, this skb can pass
2657 through good chunk of routing engine.
2659 skb_reset_mac_header(skb
);
2660 skb_reserve(skb
, MAX_HEADER
+ sizeof(struct ipv6hdr
));
2662 skb_dst_set(skb
, &rt
->dst
);
2664 err
= rt6_fill_node(net
, skb
, rt
, &fl6
.daddr
, &fl6
.saddr
, iif
,
2665 RTM_NEWROUTE
, NETLINK_CB(in_skb
).portid
,
2666 nlh
->nlmsg_seq
, 0, 0, 0);
2672 err
= rtnl_unicast(skb
, net
, NETLINK_CB(in_skb
).portid
);
2677 void inet6_rt_notify(int event
, struct rt6_info
*rt
, struct nl_info
*info
)
2679 struct sk_buff
*skb
;
2680 struct net
*net
= info
->nl_net
;
2685 seq
= info
->nlh
? info
->nlh
->nlmsg_seq
: 0;
2687 skb
= nlmsg_new(rt6_nlmsg_size(), gfp_any());
2691 err
= rt6_fill_node(net
, skb
, rt
, NULL
, NULL
, 0,
2692 event
, info
->portid
, seq
, 0, 0, 0);
2694 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2695 WARN_ON(err
== -EMSGSIZE
);
2699 rtnl_notify(skb
, net
, info
->portid
, RTNLGRP_IPV6_ROUTE
,
2700 info
->nlh
, gfp_any());
2704 rtnl_set_sk_err(net
, RTNLGRP_IPV6_ROUTE
, err
);
2707 static int ip6_route_dev_notify(struct notifier_block
*this,
2708 unsigned long event
, void *ptr
)
2710 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
2711 struct net
*net
= dev_net(dev
);
2713 if (event
== NETDEV_REGISTER
&& (dev
->flags
& IFF_LOOPBACK
)) {
2714 net
->ipv6
.ip6_null_entry
->dst
.dev
= dev
;
2715 net
->ipv6
.ip6_null_entry
->rt6i_idev
= in6_dev_get(dev
);
2716 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2717 net
->ipv6
.ip6_prohibit_entry
->dst
.dev
= dev
;
2718 net
->ipv6
.ip6_prohibit_entry
->rt6i_idev
= in6_dev_get(dev
);
2719 net
->ipv6
.ip6_blk_hole_entry
->dst
.dev
= dev
;
2720 net
->ipv6
.ip6_blk_hole_entry
->rt6i_idev
= in6_dev_get(dev
);
2731 #ifdef CONFIG_PROC_FS
2742 static int rt6_info_route(struct rt6_info
*rt
, void *p_arg
)
2744 struct seq_file
*m
= p_arg
;
2746 seq_printf(m
, "%pi6 %02x ", &rt
->rt6i_dst
.addr
, rt
->rt6i_dst
.plen
);
2748 #ifdef CONFIG_IPV6_SUBTREES
2749 seq_printf(m
, "%pi6 %02x ", &rt
->rt6i_src
.addr
, rt
->rt6i_src
.plen
);
2751 seq_puts(m
, "00000000000000000000000000000000 00 ");
2753 if (rt
->rt6i_flags
& RTF_GATEWAY
) {
2754 seq_printf(m
, "%pi6", &rt
->rt6i_gateway
);
2756 seq_puts(m
, "00000000000000000000000000000000");
2758 seq_printf(m
, " %08x %08x %08x %08x %8s\n",
2759 rt
->rt6i_metric
, atomic_read(&rt
->dst
.__refcnt
),
2760 rt
->dst
.__use
, rt
->rt6i_flags
,
2761 rt
->dst
.dev
? rt
->dst
.dev
->name
: "");
2765 static int ipv6_route_show(struct seq_file
*m
, void *v
)
2767 struct net
*net
= (struct net
*)m
->private;
2768 fib6_clean_all_ro(net
, rt6_info_route
, 0, m
);
2772 static int ipv6_route_open(struct inode
*inode
, struct file
*file
)
2774 return single_open_net(inode
, file
, ipv6_route_show
);
2777 static const struct file_operations ipv6_route_proc_fops
= {
2778 .owner
= THIS_MODULE
,
2779 .open
= ipv6_route_open
,
2781 .llseek
= seq_lseek
,
2782 .release
= single_release_net
,
2785 static int rt6_stats_seq_show(struct seq_file
*seq
, void *v
)
2787 struct net
*net
= (struct net
*)seq
->private;
2788 seq_printf(seq
, "%04x %04x %04x %04x %04x %04x %04x\n",
2789 net
->ipv6
.rt6_stats
->fib_nodes
,
2790 net
->ipv6
.rt6_stats
->fib_route_nodes
,
2791 net
->ipv6
.rt6_stats
->fib_rt_alloc
,
2792 net
->ipv6
.rt6_stats
->fib_rt_entries
,
2793 net
->ipv6
.rt6_stats
->fib_rt_cache
,
2794 dst_entries_get_slow(&net
->ipv6
.ip6_dst_ops
),
2795 net
->ipv6
.rt6_stats
->fib_discarded_routes
);
2800 static int rt6_stats_seq_open(struct inode
*inode
, struct file
*file
)
2802 return single_open_net(inode
, file
, rt6_stats_seq_show
);
2805 static const struct file_operations rt6_stats_seq_fops
= {
2806 .owner
= THIS_MODULE
,
2807 .open
= rt6_stats_seq_open
,
2809 .llseek
= seq_lseek
,
2810 .release
= single_release_net
,
2812 #endif /* CONFIG_PROC_FS */
2814 #ifdef CONFIG_SYSCTL
2817 int ipv6_sysctl_rtcache_flush(struct ctl_table
*ctl
, int write
,
2818 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2825 net
= (struct net
*)ctl
->extra1
;
2826 delay
= net
->ipv6
.sysctl
.flush_delay
;
2827 proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
2828 fib6_run_gc(delay
<= 0 ? 0 : (unsigned long)delay
, net
, delay
> 0);
2832 struct ctl_table ipv6_route_table_template
[] = {
2834 .procname
= "flush",
2835 .data
= &init_net
.ipv6
.sysctl
.flush_delay
,
2836 .maxlen
= sizeof(int),
2838 .proc_handler
= ipv6_sysctl_rtcache_flush
2841 .procname
= "gc_thresh",
2842 .data
= &ip6_dst_ops_template
.gc_thresh
,
2843 .maxlen
= sizeof(int),
2845 .proc_handler
= proc_dointvec
,
2848 .procname
= "max_size",
2849 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_max_size
,
2850 .maxlen
= sizeof(int),
2852 .proc_handler
= proc_dointvec
,
2855 .procname
= "gc_min_interval",
2856 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_min_interval
,
2857 .maxlen
= sizeof(int),
2859 .proc_handler
= proc_dointvec_jiffies
,
2862 .procname
= "gc_timeout",
2863 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_timeout
,
2864 .maxlen
= sizeof(int),
2866 .proc_handler
= proc_dointvec_jiffies
,
2869 .procname
= "gc_interval",
2870 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_interval
,
2871 .maxlen
= sizeof(int),
2873 .proc_handler
= proc_dointvec_jiffies
,
2876 .procname
= "gc_elasticity",
2877 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_elasticity
,
2878 .maxlen
= sizeof(int),
2880 .proc_handler
= proc_dointvec
,
2883 .procname
= "mtu_expires",
2884 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_mtu_expires
,
2885 .maxlen
= sizeof(int),
2887 .proc_handler
= proc_dointvec_jiffies
,
2890 .procname
= "min_adv_mss",
2891 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_min_advmss
,
2892 .maxlen
= sizeof(int),
2894 .proc_handler
= proc_dointvec
,
2897 .procname
= "gc_min_interval_ms",
2898 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_min_interval
,
2899 .maxlen
= sizeof(int),
2901 .proc_handler
= proc_dointvec_ms_jiffies
,
2906 struct ctl_table
* __net_init
ipv6_route_sysctl_init(struct net
*net
)
2908 struct ctl_table
*table
;
2910 table
= kmemdup(ipv6_route_table_template
,
2911 sizeof(ipv6_route_table_template
),
2915 table
[0].data
= &net
->ipv6
.sysctl
.flush_delay
;
2916 table
[0].extra1
= net
;
2917 table
[1].data
= &net
->ipv6
.ip6_dst_ops
.gc_thresh
;
2918 table
[2].data
= &net
->ipv6
.sysctl
.ip6_rt_max_size
;
2919 table
[3].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
2920 table
[4].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_timeout
;
2921 table
[5].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_interval
;
2922 table
[6].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
;
2923 table
[7].data
= &net
->ipv6
.sysctl
.ip6_rt_mtu_expires
;
2924 table
[8].data
= &net
->ipv6
.sysctl
.ip6_rt_min_advmss
;
2925 table
[9].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
2927 /* Don't export sysctls to unprivileged users */
2928 if (net
->user_ns
!= &init_user_ns
)
2929 table
[0].procname
= NULL
;
2936 static int __net_init
ip6_route_net_init(struct net
*net
)
2940 memcpy(&net
->ipv6
.ip6_dst_ops
, &ip6_dst_ops_template
,
2941 sizeof(net
->ipv6
.ip6_dst_ops
));
2943 if (dst_entries_init(&net
->ipv6
.ip6_dst_ops
) < 0)
2944 goto out_ip6_dst_ops
;
2946 net
->ipv6
.ip6_null_entry
= kmemdup(&ip6_null_entry_template
,
2947 sizeof(*net
->ipv6
.ip6_null_entry
),
2949 if (!net
->ipv6
.ip6_null_entry
)
2950 goto out_ip6_dst_entries
;
2951 net
->ipv6
.ip6_null_entry
->dst
.path
=
2952 (struct dst_entry
*)net
->ipv6
.ip6_null_entry
;
2953 net
->ipv6
.ip6_null_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
2954 dst_init_metrics(&net
->ipv6
.ip6_null_entry
->dst
,
2955 ip6_template_metrics
, true);
2957 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2958 net
->ipv6
.ip6_prohibit_entry
= kmemdup(&ip6_prohibit_entry_template
,
2959 sizeof(*net
->ipv6
.ip6_prohibit_entry
),
2961 if (!net
->ipv6
.ip6_prohibit_entry
)
2962 goto out_ip6_null_entry
;
2963 net
->ipv6
.ip6_prohibit_entry
->dst
.path
=
2964 (struct dst_entry
*)net
->ipv6
.ip6_prohibit_entry
;
2965 net
->ipv6
.ip6_prohibit_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
2966 dst_init_metrics(&net
->ipv6
.ip6_prohibit_entry
->dst
,
2967 ip6_template_metrics
, true);
2969 net
->ipv6
.ip6_blk_hole_entry
= kmemdup(&ip6_blk_hole_entry_template
,
2970 sizeof(*net
->ipv6
.ip6_blk_hole_entry
),
2972 if (!net
->ipv6
.ip6_blk_hole_entry
)
2973 goto out_ip6_prohibit_entry
;
2974 net
->ipv6
.ip6_blk_hole_entry
->dst
.path
=
2975 (struct dst_entry
*)net
->ipv6
.ip6_blk_hole_entry
;
2976 net
->ipv6
.ip6_blk_hole_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
2977 dst_init_metrics(&net
->ipv6
.ip6_blk_hole_entry
->dst
,
2978 ip6_template_metrics
, true);
2981 net
->ipv6
.sysctl
.flush_delay
= 0;
2982 net
->ipv6
.sysctl
.ip6_rt_max_size
= 4096;
2983 net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
= HZ
/ 2;
2984 net
->ipv6
.sysctl
.ip6_rt_gc_timeout
= 60*HZ
;
2985 net
->ipv6
.sysctl
.ip6_rt_gc_interval
= 30*HZ
;
2986 net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
= 9;
2987 net
->ipv6
.sysctl
.ip6_rt_mtu_expires
= 10*60*HZ
;
2988 net
->ipv6
.sysctl
.ip6_rt_min_advmss
= IPV6_MIN_MTU
- 20 - 40;
2990 net
->ipv6
.ip6_rt_gc_expire
= 30*HZ
;
2996 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2997 out_ip6_prohibit_entry
:
2998 kfree(net
->ipv6
.ip6_prohibit_entry
);
3000 kfree(net
->ipv6
.ip6_null_entry
);
3002 out_ip6_dst_entries
:
3003 dst_entries_destroy(&net
->ipv6
.ip6_dst_ops
);
3008 static void __net_exit
ip6_route_net_exit(struct net
*net
)
3010 kfree(net
->ipv6
.ip6_null_entry
);
3011 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3012 kfree(net
->ipv6
.ip6_prohibit_entry
);
3013 kfree(net
->ipv6
.ip6_blk_hole_entry
);
3015 dst_entries_destroy(&net
->ipv6
.ip6_dst_ops
);
3018 static int __net_init
ip6_route_net_init_late(struct net
*net
)
3020 #ifdef CONFIG_PROC_FS
3021 proc_create("ipv6_route", 0, net
->proc_net
, &ipv6_route_proc_fops
);
3022 proc_create("rt6_stats", S_IRUGO
, net
->proc_net
, &rt6_stats_seq_fops
);
3027 static void __net_exit
ip6_route_net_exit_late(struct net
*net
)
3029 #ifdef CONFIG_PROC_FS
3030 remove_proc_entry("ipv6_route", net
->proc_net
);
3031 remove_proc_entry("rt6_stats", net
->proc_net
);
3035 static struct pernet_operations ip6_route_net_ops
= {
3036 .init
= ip6_route_net_init
,
3037 .exit
= ip6_route_net_exit
,
3040 static int __net_init
ipv6_inetpeer_init(struct net
*net
)
3042 struct inet_peer_base
*bp
= kmalloc(sizeof(*bp
), GFP_KERNEL
);
3046 inet_peer_base_init(bp
);
3047 net
->ipv6
.peers
= bp
;
3051 static void __net_exit
ipv6_inetpeer_exit(struct net
*net
)
3053 struct inet_peer_base
*bp
= net
->ipv6
.peers
;
3055 net
->ipv6
.peers
= NULL
;
3056 inetpeer_invalidate_tree(bp
);
3060 static struct pernet_operations ipv6_inetpeer_ops
= {
3061 .init
= ipv6_inetpeer_init
,
3062 .exit
= ipv6_inetpeer_exit
,
3065 static struct pernet_operations ip6_route_net_late_ops
= {
3066 .init
= ip6_route_net_init_late
,
3067 .exit
= ip6_route_net_exit_late
,
3070 static struct notifier_block ip6_route_dev_notifier
= {
3071 .notifier_call
= ip6_route_dev_notify
,
3075 int __init
ip6_route_init(void)
3080 ip6_dst_ops_template
.kmem_cachep
=
3081 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info
), 0,
3082 SLAB_HWCACHE_ALIGN
, NULL
);
3083 if (!ip6_dst_ops_template
.kmem_cachep
)
3086 ret
= dst_entries_init(&ip6_dst_blackhole_ops
);
3088 goto out_kmem_cache
;
3090 ret
= register_pernet_subsys(&ipv6_inetpeer_ops
);
3092 goto out_dst_entries
;
3094 ret
= register_pernet_subsys(&ip6_route_net_ops
);
3096 goto out_register_inetpeer
;
3098 ip6_dst_blackhole_ops
.kmem_cachep
= ip6_dst_ops_template
.kmem_cachep
;
3100 /* Registering of the loopback is done before this portion of code,
3101 * the loopback reference in rt6_info will not be taken, do it
3102 * manually for init_net */
3103 init_net
.ipv6
.ip6_null_entry
->dst
.dev
= init_net
.loopback_dev
;
3104 init_net
.ipv6
.ip6_null_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3105 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3106 init_net
.ipv6
.ip6_prohibit_entry
->dst
.dev
= init_net
.loopback_dev
;
3107 init_net
.ipv6
.ip6_prohibit_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3108 init_net
.ipv6
.ip6_blk_hole_entry
->dst
.dev
= init_net
.loopback_dev
;
3109 init_net
.ipv6
.ip6_blk_hole_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3113 goto out_register_subsys
;
3119 ret
= fib6_rules_init();
3123 ret
= register_pernet_subsys(&ip6_route_net_late_ops
);
3125 goto fib6_rules_init
;
3128 if (__rtnl_register(PF_INET6
, RTM_NEWROUTE
, inet6_rtm_newroute
, NULL
, NULL
) ||
3129 __rtnl_register(PF_INET6
, RTM_DELROUTE
, inet6_rtm_delroute
, NULL
, NULL
) ||
3130 __rtnl_register(PF_INET6
, RTM_GETROUTE
, inet6_rtm_getroute
, NULL
, NULL
))
3131 goto out_register_late_subsys
;
3133 ret
= register_netdevice_notifier(&ip6_route_dev_notifier
);
3135 goto out_register_late_subsys
;
3140 out_register_late_subsys
:
3141 unregister_pernet_subsys(&ip6_route_net_late_ops
);
3143 fib6_rules_cleanup();
3148 out_register_subsys
:
3149 unregister_pernet_subsys(&ip6_route_net_ops
);
3150 out_register_inetpeer
:
3151 unregister_pernet_subsys(&ipv6_inetpeer_ops
);
3153 dst_entries_destroy(&ip6_dst_blackhole_ops
);
3155 kmem_cache_destroy(ip6_dst_ops_template
.kmem_cachep
);
3159 void ip6_route_cleanup(void)
3161 unregister_netdevice_notifier(&ip6_route_dev_notifier
);
3162 unregister_pernet_subsys(&ip6_route_net_late_ops
);
3163 fib6_rules_cleanup();
3166 unregister_pernet_subsys(&ipv6_inetpeer_ops
);
3167 unregister_pernet_subsys(&ip6_route_net_ops
);
3168 dst_entries_destroy(&ip6_dst_blackhole_ops
);
3169 kmem_cache_destroy(ip6_dst_ops_template
.kmem_cachep
);