2 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
16 * YOSHIFUJI Hideaki @USAGI
17 * reworked default router selection.
18 * - respect outgoing interface
19 * - select from (probably) reachable routers (i.e.
20 * routers in REACHABLE, STALE, DELAY or PROBE states).
21 * - always select the same router if it is (probably)
22 * reachable. otherwise, round-robin the list.
24 * Fixed routing subtrees.
27 #define pr_fmt(fmt) "IPv6: " fmt
29 #include <linux/capability.h>
30 #include <linux/errno.h>
31 #include <linux/export.h>
32 #include <linux/types.h>
33 #include <linux/times.h>
34 #include <linux/socket.h>
35 #include <linux/sockios.h>
36 #include <linux/net.h>
37 #include <linux/route.h>
38 #include <linux/netdevice.h>
39 #include <linux/in6.h>
40 #include <linux/mroute6.h>
41 #include <linux/init.h>
42 #include <linux/if_arp.h>
43 #include <linux/proc_fs.h>
44 #include <linux/seq_file.h>
45 #include <linux/nsproxy.h>
46 #include <linux/slab.h>
47 #include <net/net_namespace.h>
50 #include <net/ip6_fib.h>
51 #include <net/ip6_route.h>
52 #include <net/ndisc.h>
53 #include <net/addrconf.h>
55 #include <linux/rtnetlink.h>
58 #include <net/netevent.h>
59 #include <net/netlink.h>
60 #include <net/nexthop.h>
62 #include <asm/uaccess.h>
65 #include <linux/sysctl.h>
69 RT6_NUD_FAIL_HARD
= -3,
70 RT6_NUD_FAIL_PROBE
= -2,
71 RT6_NUD_FAIL_DO_RR
= -1,
75 static struct rt6_info
*ip6_rt_copy(struct rt6_info
*ort
,
76 const struct in6_addr
*dest
);
77 static struct dst_entry
*ip6_dst_check(struct dst_entry
*dst
, u32 cookie
);
78 static unsigned int ip6_default_advmss(const struct dst_entry
*dst
);
79 static unsigned int ip6_mtu(const struct dst_entry
*dst
);
80 static struct dst_entry
*ip6_negative_advice(struct dst_entry
*);
81 static void ip6_dst_destroy(struct dst_entry
*);
82 static void ip6_dst_ifdown(struct dst_entry
*,
83 struct net_device
*dev
, int how
);
84 static int ip6_dst_gc(struct dst_ops
*ops
);
86 static int ip6_pkt_discard(struct sk_buff
*skb
);
87 static int ip6_pkt_discard_out(struct sock
*sk
, struct sk_buff
*skb
);
88 static int ip6_pkt_prohibit(struct sk_buff
*skb
);
89 static int ip6_pkt_prohibit_out(struct sock
*sk
, struct sk_buff
*skb
);
90 static void ip6_link_failure(struct sk_buff
*skb
);
91 static void ip6_rt_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
92 struct sk_buff
*skb
, u32 mtu
);
93 static void rt6_do_redirect(struct dst_entry
*dst
, struct sock
*sk
,
95 static int rt6_score_route(struct rt6_info
*rt
, int oif
, int strict
);
97 #ifdef CONFIG_IPV6_ROUTE_INFO
98 static struct rt6_info
*rt6_add_route_info(struct net
*net
,
99 const struct in6_addr
*prefix
, int prefixlen
,
100 const struct in6_addr
*gwaddr
, int ifindex
,
102 static struct rt6_info
*rt6_get_route_info(struct net
*net
,
103 const struct in6_addr
*prefix
, int prefixlen
,
104 const struct in6_addr
*gwaddr
, int ifindex
);
107 static void rt6_bind_peer(struct rt6_info
*rt
, int create
)
109 struct inet_peer_base
*base
;
110 struct inet_peer
*peer
;
112 base
= inetpeer_base_ptr(rt
->_rt6i_peer
);
116 peer
= inet_getpeer_v6(base
, &rt
->rt6i_dst
.addr
, create
);
118 if (!rt6_set_peer(rt
, peer
))
123 static struct inet_peer
*__rt6_get_peer(struct rt6_info
*rt
, int create
)
125 if (rt6_has_peer(rt
))
126 return rt6_peer_ptr(rt
);
128 rt6_bind_peer(rt
, create
);
129 return (rt6_has_peer(rt
) ? rt6_peer_ptr(rt
) : NULL
);
132 static struct inet_peer
*rt6_get_peer_create(struct rt6_info
*rt
)
134 return __rt6_get_peer(rt
, 1);
137 static u32
*ipv6_cow_metrics(struct dst_entry
*dst
, unsigned long old
)
139 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
140 struct inet_peer
*peer
;
143 if (!(rt
->dst
.flags
& DST_HOST
))
146 peer
= rt6_get_peer_create(rt
);
148 u32
*old_p
= __DST_METRICS_PTR(old
);
149 unsigned long prev
, new;
152 if (inet_metrics_new(peer
) ||
153 (old
& DST_METRICS_FORCE_OVERWRITE
))
154 memcpy(p
, old_p
, sizeof(u32
) * RTAX_MAX
);
156 new = (unsigned long) p
;
157 prev
= cmpxchg(&dst
->_metrics
, old
, new);
160 p
= __DST_METRICS_PTR(prev
);
161 if (prev
& DST_METRICS_READ_ONLY
)
168 static inline const void *choose_neigh_daddr(struct rt6_info
*rt
,
172 struct in6_addr
*p
= &rt
->rt6i_gateway
;
174 if (!ipv6_addr_any(p
))
175 return (const void *) p
;
177 return &ipv6_hdr(skb
)->daddr
;
181 static struct neighbour
*ip6_neigh_lookup(const struct dst_entry
*dst
,
185 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
188 daddr
= choose_neigh_daddr(rt
, skb
, daddr
);
189 n
= __ipv6_neigh_lookup(dst
->dev
, daddr
);
192 return neigh_create(&nd_tbl
, daddr
, dst
->dev
);
195 static struct dst_ops ip6_dst_ops_template
= {
197 .protocol
= cpu_to_be16(ETH_P_IPV6
),
200 .check
= ip6_dst_check
,
201 .default_advmss
= ip6_default_advmss
,
203 .cow_metrics
= ipv6_cow_metrics
,
204 .destroy
= ip6_dst_destroy
,
205 .ifdown
= ip6_dst_ifdown
,
206 .negative_advice
= ip6_negative_advice
,
207 .link_failure
= ip6_link_failure
,
208 .update_pmtu
= ip6_rt_update_pmtu
,
209 .redirect
= rt6_do_redirect
,
210 .local_out
= __ip6_local_out
,
211 .neigh_lookup
= ip6_neigh_lookup
,
214 static unsigned int ip6_blackhole_mtu(const struct dst_entry
*dst
)
216 unsigned int mtu
= dst_metric_raw(dst
, RTAX_MTU
);
218 return mtu
? : dst
->dev
->mtu
;
221 static void ip6_rt_blackhole_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
222 struct sk_buff
*skb
, u32 mtu
)
226 static void ip6_rt_blackhole_redirect(struct dst_entry
*dst
, struct sock
*sk
,
231 static u32
*ip6_rt_blackhole_cow_metrics(struct dst_entry
*dst
,
237 static struct dst_ops ip6_dst_blackhole_ops
= {
239 .protocol
= cpu_to_be16(ETH_P_IPV6
),
240 .destroy
= ip6_dst_destroy
,
241 .check
= ip6_dst_check
,
242 .mtu
= ip6_blackhole_mtu
,
243 .default_advmss
= ip6_default_advmss
,
244 .update_pmtu
= ip6_rt_blackhole_update_pmtu
,
245 .redirect
= ip6_rt_blackhole_redirect
,
246 .cow_metrics
= ip6_rt_blackhole_cow_metrics
,
247 .neigh_lookup
= ip6_neigh_lookup
,
250 static const u32 ip6_template_metrics
[RTAX_MAX
] = {
251 [RTAX_HOPLIMIT
- 1] = 0,
254 static const struct rt6_info ip6_null_entry_template
= {
256 .__refcnt
= ATOMIC_INIT(1),
258 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
259 .error
= -ENETUNREACH
,
260 .input
= ip6_pkt_discard
,
261 .output
= ip6_pkt_discard_out
,
263 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
264 .rt6i_protocol
= RTPROT_KERNEL
,
265 .rt6i_metric
= ~(u32
) 0,
266 .rt6i_ref
= ATOMIC_INIT(1),
269 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
271 static const struct rt6_info ip6_prohibit_entry_template
= {
273 .__refcnt
= ATOMIC_INIT(1),
275 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
277 .input
= ip6_pkt_prohibit
,
278 .output
= ip6_pkt_prohibit_out
,
280 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
281 .rt6i_protocol
= RTPROT_KERNEL
,
282 .rt6i_metric
= ~(u32
) 0,
283 .rt6i_ref
= ATOMIC_INIT(1),
286 static const struct rt6_info ip6_blk_hole_entry_template
= {
288 .__refcnt
= ATOMIC_INIT(1),
290 .obsolete
= DST_OBSOLETE_FORCE_CHK
,
292 .input
= dst_discard
,
293 .output
= dst_discard_sk
,
295 .rt6i_flags
= (RTF_REJECT
| RTF_NONEXTHOP
),
296 .rt6i_protocol
= RTPROT_KERNEL
,
297 .rt6i_metric
= ~(u32
) 0,
298 .rt6i_ref
= ATOMIC_INIT(1),
303 /* allocate dst with ip6_dst_ops */
304 static inline struct rt6_info
*ip6_dst_alloc(struct net
*net
,
305 struct net_device
*dev
,
307 struct fib6_table
*table
)
309 struct rt6_info
*rt
= dst_alloc(&net
->ipv6
.ip6_dst_ops
, dev
,
310 0, DST_OBSOLETE_FORCE_CHK
, flags
);
313 struct dst_entry
*dst
= &rt
->dst
;
315 memset(dst
+ 1, 0, sizeof(*rt
) - sizeof(*dst
));
316 rt6_init_peer(rt
, table
? &table
->tb6_peers
: net
->ipv6
.peers
);
317 INIT_LIST_HEAD(&rt
->rt6i_siblings
);
322 static void ip6_dst_destroy(struct dst_entry
*dst
)
324 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
325 struct inet6_dev
*idev
= rt
->rt6i_idev
;
326 struct dst_entry
*from
= dst
->from
;
328 if (!(rt
->dst
.flags
& DST_HOST
))
329 dst_destroy_metrics_generic(dst
);
332 rt
->rt6i_idev
= NULL
;
339 if (rt6_has_peer(rt
)) {
340 struct inet_peer
*peer
= rt6_peer_ptr(rt
);
345 static void ip6_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
,
348 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
349 struct inet6_dev
*idev
= rt
->rt6i_idev
;
350 struct net_device
*loopback_dev
=
351 dev_net(dev
)->loopback_dev
;
353 if (dev
!= loopback_dev
) {
354 if (idev
&& idev
->dev
== dev
) {
355 struct inet6_dev
*loopback_idev
=
356 in6_dev_get(loopback_dev
);
358 rt
->rt6i_idev
= loopback_idev
;
365 static bool rt6_check_expired(const struct rt6_info
*rt
)
367 if (rt
->rt6i_flags
& RTF_EXPIRES
) {
368 if (time_after(jiffies
, rt
->dst
.expires
))
370 } else if (rt
->dst
.from
) {
371 return rt6_check_expired((struct rt6_info
*) rt
->dst
.from
);
376 /* Multipath route selection:
377 * Hash based function using packet header and flowlabel.
378 * Adapted from fib_info_hashfn()
380 static int rt6_info_hash_nhsfn(unsigned int candidate_count
,
381 const struct flowi6
*fl6
)
383 unsigned int val
= fl6
->flowi6_proto
;
385 val
^= ipv6_addr_hash(&fl6
->daddr
);
386 val
^= ipv6_addr_hash(&fl6
->saddr
);
388 /* Work only if this not encapsulated */
389 switch (fl6
->flowi6_proto
) {
393 val
^= (__force u16
)fl6
->fl6_sport
;
394 val
^= (__force u16
)fl6
->fl6_dport
;
398 val
^= (__force u16
)fl6
->fl6_icmp_type
;
399 val
^= (__force u16
)fl6
->fl6_icmp_code
;
402 /* RFC6438 recommands to use flowlabel */
403 val
^= (__force u32
)fl6
->flowlabel
;
405 /* Perhaps, we need to tune, this function? */
406 val
= val
^ (val
>> 7) ^ (val
>> 12);
407 return val
% candidate_count
;
410 static struct rt6_info
*rt6_multipath_select(struct rt6_info
*match
,
411 struct flowi6
*fl6
, int oif
,
414 struct rt6_info
*sibling
, *next_sibling
;
417 route_choosen
= rt6_info_hash_nhsfn(match
->rt6i_nsiblings
+ 1, fl6
);
418 /* Don't change the route, if route_choosen == 0
419 * (siblings does not include ourself)
422 list_for_each_entry_safe(sibling
, next_sibling
,
423 &match
->rt6i_siblings
, rt6i_siblings
) {
425 if (route_choosen
== 0) {
426 if (rt6_score_route(sibling
, oif
, strict
) < 0)
436 * Route lookup. Any table->tb6_lock is implied.
439 static inline struct rt6_info
*rt6_device_match(struct net
*net
,
441 const struct in6_addr
*saddr
,
445 struct rt6_info
*local
= NULL
;
446 struct rt6_info
*sprt
;
448 if (!oif
&& ipv6_addr_any(saddr
))
451 for (sprt
= rt
; sprt
; sprt
= sprt
->dst
.rt6_next
) {
452 struct net_device
*dev
= sprt
->dst
.dev
;
455 if (dev
->ifindex
== oif
)
457 if (dev
->flags
& IFF_LOOPBACK
) {
458 if (!sprt
->rt6i_idev
||
459 sprt
->rt6i_idev
->dev
->ifindex
!= oif
) {
460 if (flags
& RT6_LOOKUP_F_IFACE
&& oif
)
462 if (local
&& (!oif
||
463 local
->rt6i_idev
->dev
->ifindex
== oif
))
469 if (ipv6_chk_addr(net
, saddr
, dev
,
470 flags
& RT6_LOOKUP_F_IFACE
))
479 if (flags
& RT6_LOOKUP_F_IFACE
)
480 return net
->ipv6
.ip6_null_entry
;
486 #ifdef CONFIG_IPV6_ROUTER_PREF
487 struct __rt6_probe_work
{
488 struct work_struct work
;
489 struct in6_addr target
;
490 struct net_device
*dev
;
493 static void rt6_probe_deferred(struct work_struct
*w
)
495 struct in6_addr mcaddr
;
496 struct __rt6_probe_work
*work
=
497 container_of(w
, struct __rt6_probe_work
, work
);
499 addrconf_addr_solict_mult(&work
->target
, &mcaddr
);
500 ndisc_send_ns(work
->dev
, NULL
, &work
->target
, &mcaddr
, NULL
);
505 static void rt6_probe(struct rt6_info
*rt
)
507 struct neighbour
*neigh
;
509 * Okay, this does not seem to be appropriate
510 * for now, however, we need to check if it
511 * is really so; aka Router Reachability Probing.
513 * Router Reachability Probe MUST be rate-limited
514 * to no more than one per minute.
516 if (!rt
|| !(rt
->rt6i_flags
& RTF_GATEWAY
))
519 neigh
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, &rt
->rt6i_gateway
);
521 write_lock(&neigh
->lock
);
522 if (neigh
->nud_state
& NUD_VALID
)
527 time_after(jiffies
, neigh
->updated
+ rt
->rt6i_idev
->cnf
.rtr_probe_interval
)) {
528 struct __rt6_probe_work
*work
;
530 work
= kmalloc(sizeof(*work
), GFP_ATOMIC
);
533 __neigh_set_probe_once(neigh
);
536 write_unlock(&neigh
->lock
);
539 INIT_WORK(&work
->work
, rt6_probe_deferred
);
540 work
->target
= rt
->rt6i_gateway
;
541 dev_hold(rt
->dst
.dev
);
542 work
->dev
= rt
->dst
.dev
;
543 schedule_work(&work
->work
);
547 write_unlock(&neigh
->lock
);
549 rcu_read_unlock_bh();
552 static inline void rt6_probe(struct rt6_info
*rt
)
558 * Default Router Selection (RFC 2461 6.3.6)
560 static inline int rt6_check_dev(struct rt6_info
*rt
, int oif
)
562 struct net_device
*dev
= rt
->dst
.dev
;
563 if (!oif
|| dev
->ifindex
== oif
)
565 if ((dev
->flags
& IFF_LOOPBACK
) &&
566 rt
->rt6i_idev
&& rt
->rt6i_idev
->dev
->ifindex
== oif
)
571 static inline enum rt6_nud_state
rt6_check_neigh(struct rt6_info
*rt
)
573 struct neighbour
*neigh
;
574 enum rt6_nud_state ret
= RT6_NUD_FAIL_HARD
;
576 if (rt
->rt6i_flags
& RTF_NONEXTHOP
||
577 !(rt
->rt6i_flags
& RTF_GATEWAY
))
578 return RT6_NUD_SUCCEED
;
581 neigh
= __ipv6_neigh_lookup_noref(rt
->dst
.dev
, &rt
->rt6i_gateway
);
583 read_lock(&neigh
->lock
);
584 if (neigh
->nud_state
& NUD_VALID
)
585 ret
= RT6_NUD_SUCCEED
;
586 #ifdef CONFIG_IPV6_ROUTER_PREF
587 else if (!(neigh
->nud_state
& NUD_FAILED
))
588 ret
= RT6_NUD_SUCCEED
;
590 ret
= RT6_NUD_FAIL_PROBE
;
592 read_unlock(&neigh
->lock
);
594 ret
= IS_ENABLED(CONFIG_IPV6_ROUTER_PREF
) ?
595 RT6_NUD_SUCCEED
: RT6_NUD_FAIL_DO_RR
;
597 rcu_read_unlock_bh();
602 static int rt6_score_route(struct rt6_info
*rt
, int oif
,
607 m
= rt6_check_dev(rt
, oif
);
608 if (!m
&& (strict
& RT6_LOOKUP_F_IFACE
))
609 return RT6_NUD_FAIL_HARD
;
610 #ifdef CONFIG_IPV6_ROUTER_PREF
611 m
|= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt
->rt6i_flags
)) << 2;
613 if (strict
& RT6_LOOKUP_F_REACHABLE
) {
614 int n
= rt6_check_neigh(rt
);
621 static struct rt6_info
*find_match(struct rt6_info
*rt
, int oif
, int strict
,
622 int *mpri
, struct rt6_info
*match
,
626 bool match_do_rr
= false;
628 if (rt6_check_expired(rt
))
631 m
= rt6_score_route(rt
, oif
, strict
);
632 if (m
== RT6_NUD_FAIL_DO_RR
) {
634 m
= 0; /* lowest valid score */
635 } else if (m
== RT6_NUD_FAIL_HARD
) {
639 if (strict
& RT6_LOOKUP_F_REACHABLE
)
642 /* note that m can be RT6_NUD_FAIL_PROBE at this point */
644 *do_rr
= match_do_rr
;
652 static struct rt6_info
*find_rr_leaf(struct fib6_node
*fn
,
653 struct rt6_info
*rr_head
,
654 u32 metric
, int oif
, int strict
,
657 struct rt6_info
*rt
, *match
;
661 for (rt
= rr_head
; rt
&& rt
->rt6i_metric
== metric
;
662 rt
= rt
->dst
.rt6_next
)
663 match
= find_match(rt
, oif
, strict
, &mpri
, match
, do_rr
);
664 for (rt
= fn
->leaf
; rt
&& rt
!= rr_head
&& rt
->rt6i_metric
== metric
;
665 rt
= rt
->dst
.rt6_next
)
666 match
= find_match(rt
, oif
, strict
, &mpri
, match
, do_rr
);
671 static struct rt6_info
*rt6_select(struct fib6_node
*fn
, int oif
, int strict
)
673 struct rt6_info
*match
, *rt0
;
679 fn
->rr_ptr
= rt0
= fn
->leaf
;
681 match
= find_rr_leaf(fn
, rt0
, rt0
->rt6i_metric
, oif
, strict
,
685 struct rt6_info
*next
= rt0
->dst
.rt6_next
;
687 /* no entries matched; do round-robin */
688 if (!next
|| next
->rt6i_metric
!= rt0
->rt6i_metric
)
695 net
= dev_net(rt0
->dst
.dev
);
696 return match
? match
: net
->ipv6
.ip6_null_entry
;
699 #ifdef CONFIG_IPV6_ROUTE_INFO
700 int rt6_route_rcv(struct net_device
*dev
, u8
*opt
, int len
,
701 const struct in6_addr
*gwaddr
)
703 struct net
*net
= dev_net(dev
);
704 struct route_info
*rinfo
= (struct route_info
*) opt
;
705 struct in6_addr prefix_buf
, *prefix
;
707 unsigned long lifetime
;
710 if (len
< sizeof(struct route_info
)) {
714 /* Sanity check for prefix_len and length */
715 if (rinfo
->length
> 3) {
717 } else if (rinfo
->prefix_len
> 128) {
719 } else if (rinfo
->prefix_len
> 64) {
720 if (rinfo
->length
< 2) {
723 } else if (rinfo
->prefix_len
> 0) {
724 if (rinfo
->length
< 1) {
729 pref
= rinfo
->route_pref
;
730 if (pref
== ICMPV6_ROUTER_PREF_INVALID
)
733 lifetime
= addrconf_timeout_fixup(ntohl(rinfo
->lifetime
), HZ
);
735 if (rinfo
->length
== 3)
736 prefix
= (struct in6_addr
*)rinfo
->prefix
;
738 /* this function is safe */
739 ipv6_addr_prefix(&prefix_buf
,
740 (struct in6_addr
*)rinfo
->prefix
,
742 prefix
= &prefix_buf
;
745 if (rinfo
->prefix_len
== 0)
746 rt
= rt6_get_dflt_router(gwaddr
, dev
);
748 rt
= rt6_get_route_info(net
, prefix
, rinfo
->prefix_len
,
749 gwaddr
, dev
->ifindex
);
751 if (rt
&& !lifetime
) {
757 rt
= rt6_add_route_info(net
, prefix
, rinfo
->prefix_len
, gwaddr
, dev
->ifindex
,
760 rt
->rt6i_flags
= RTF_ROUTEINFO
|
761 (rt
->rt6i_flags
& ~RTF_PREF_MASK
) | RTF_PREF(pref
);
764 if (!addrconf_finite_timeout(lifetime
))
765 rt6_clean_expires(rt
);
767 rt6_set_expires(rt
, jiffies
+ HZ
* lifetime
);
775 static struct fib6_node
* fib6_backtrack(struct fib6_node
*fn
,
776 struct in6_addr
*saddr
)
778 struct fib6_node
*pn
;
780 if (fn
->fn_flags
& RTN_TL_ROOT
)
783 if (FIB6_SUBTREE(pn
) && FIB6_SUBTREE(pn
) != fn
)
784 fn
= fib6_lookup(FIB6_SUBTREE(pn
), NULL
, saddr
);
787 if (fn
->fn_flags
& RTN_RTINFO
)
792 static struct rt6_info
*ip6_pol_route_lookup(struct net
*net
,
793 struct fib6_table
*table
,
794 struct flowi6
*fl6
, int flags
)
796 struct fib6_node
*fn
;
799 read_lock_bh(&table
->tb6_lock
);
800 fn
= fib6_lookup(&table
->tb6_root
, &fl6
->daddr
, &fl6
->saddr
);
803 rt
= rt6_device_match(net
, rt
, &fl6
->saddr
, fl6
->flowi6_oif
, flags
);
804 if (rt
->rt6i_nsiblings
&& fl6
->flowi6_oif
== 0)
805 rt
= rt6_multipath_select(rt
, fl6
, fl6
->flowi6_oif
, flags
);
806 if (rt
== net
->ipv6
.ip6_null_entry
) {
807 fn
= fib6_backtrack(fn
, &fl6
->saddr
);
811 dst_use(&rt
->dst
, jiffies
);
812 read_unlock_bh(&table
->tb6_lock
);
817 struct dst_entry
*ip6_route_lookup(struct net
*net
, struct flowi6
*fl6
,
820 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_lookup
);
822 EXPORT_SYMBOL_GPL(ip6_route_lookup
);
824 struct rt6_info
*rt6_lookup(struct net
*net
, const struct in6_addr
*daddr
,
825 const struct in6_addr
*saddr
, int oif
, int strict
)
827 struct flowi6 fl6
= {
831 struct dst_entry
*dst
;
832 int flags
= strict
? RT6_LOOKUP_F_IFACE
: 0;
835 memcpy(&fl6
.saddr
, saddr
, sizeof(*saddr
));
836 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
839 dst
= fib6_rule_lookup(net
, &fl6
, flags
, ip6_pol_route_lookup
);
841 return (struct rt6_info
*) dst
;
847 EXPORT_SYMBOL(rt6_lookup
);
849 /* ip6_ins_rt is called with FREE table->tb6_lock.
850 It takes new route entry, the addition fails by any reason the
851 route is freed. In any case, if caller does not hold it, it may
855 static int __ip6_ins_rt(struct rt6_info
*rt
, struct nl_info
*info
,
856 struct nlattr
*mx
, int mx_len
)
859 struct fib6_table
*table
;
861 table
= rt
->rt6i_table
;
862 write_lock_bh(&table
->tb6_lock
);
863 err
= fib6_add(&table
->tb6_root
, rt
, info
, mx
, mx_len
);
864 write_unlock_bh(&table
->tb6_lock
);
869 int ip6_ins_rt(struct rt6_info
*rt
)
871 struct nl_info info
= {
872 .nl_net
= dev_net(rt
->dst
.dev
),
874 return __ip6_ins_rt(rt
, &info
, NULL
, 0);
877 static struct rt6_info
*rt6_alloc_cow(struct rt6_info
*ort
,
878 const struct in6_addr
*daddr
,
879 const struct in6_addr
*saddr
)
887 rt
= ip6_rt_copy(ort
, daddr
);
890 if (ort
->rt6i_dst
.plen
!= 128 &&
891 ipv6_addr_equal(&ort
->rt6i_dst
.addr
, daddr
))
892 rt
->rt6i_flags
|= RTF_ANYCAST
;
894 rt
->rt6i_flags
|= RTF_CACHE
;
896 #ifdef CONFIG_IPV6_SUBTREES
897 if (rt
->rt6i_src
.plen
&& saddr
) {
898 rt
->rt6i_src
.addr
= *saddr
;
899 rt
->rt6i_src
.plen
= 128;
907 static struct rt6_info
*rt6_alloc_clone(struct rt6_info
*ort
,
908 const struct in6_addr
*daddr
)
910 struct rt6_info
*rt
= ip6_rt_copy(ort
, daddr
);
913 rt
->rt6i_flags
|= RTF_CACHE
;
917 static struct rt6_info
*ip6_pol_route(struct net
*net
, struct fib6_table
*table
, int oif
,
918 struct flowi6
*fl6
, int flags
)
920 struct fib6_node
*fn
, *saved_fn
;
921 struct rt6_info
*rt
, *nrt
;
926 strict
|= flags
& RT6_LOOKUP_F_IFACE
;
927 if (net
->ipv6
.devconf_all
->forwarding
== 0)
928 strict
|= RT6_LOOKUP_F_REACHABLE
;
930 redo_fib6_lookup_lock
:
931 read_lock_bh(&table
->tb6_lock
);
933 fn
= fib6_lookup(&table
->tb6_root
, &fl6
->daddr
, &fl6
->saddr
);
937 rt
= rt6_select(fn
, oif
, strict
);
938 if (rt
->rt6i_nsiblings
)
939 rt
= rt6_multipath_select(rt
, fl6
, oif
, strict
);
940 if (rt
== net
->ipv6
.ip6_null_entry
) {
941 fn
= fib6_backtrack(fn
, &fl6
->saddr
);
943 goto redo_rt6_select
;
944 else if (strict
& RT6_LOOKUP_F_REACHABLE
) {
945 /* also consider unreachable route */
946 strict
&= ~RT6_LOOKUP_F_REACHABLE
;
948 goto redo_rt6_select
;
951 read_unlock_bh(&table
->tb6_lock
);
957 read_unlock_bh(&table
->tb6_lock
);
959 if (rt
->rt6i_flags
& RTF_CACHE
)
962 if (!(rt
->rt6i_flags
& (RTF_NONEXTHOP
| RTF_GATEWAY
)))
963 nrt
= rt6_alloc_cow(rt
, &fl6
->daddr
, &fl6
->saddr
);
964 else if (!(rt
->dst
.flags
& DST_HOST
))
965 nrt
= rt6_alloc_clone(rt
, &fl6
->daddr
);
970 rt
= nrt
? : net
->ipv6
.ip6_null_entry
;
974 err
= ip6_ins_rt(nrt
);
983 * Race condition! In the gap, when table->tb6_lock was
984 * released someone could insert this route. Relookup.
987 goto redo_fib6_lookup_lock
;
990 rt
->dst
.lastuse
= jiffies
;
996 static struct rt6_info
*ip6_pol_route_input(struct net
*net
, struct fib6_table
*table
,
997 struct flowi6
*fl6
, int flags
)
999 return ip6_pol_route(net
, table
, fl6
->flowi6_iif
, fl6
, flags
);
1002 static struct dst_entry
*ip6_route_input_lookup(struct net
*net
,
1003 struct net_device
*dev
,
1004 struct flowi6
*fl6
, int flags
)
1006 if (rt6_need_strict(&fl6
->daddr
) && dev
->type
!= ARPHRD_PIMREG
)
1007 flags
|= RT6_LOOKUP_F_IFACE
;
1009 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_input
);
1012 void ip6_route_input(struct sk_buff
*skb
)
1014 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
1015 struct net
*net
= dev_net(skb
->dev
);
1016 int flags
= RT6_LOOKUP_F_HAS_SADDR
;
1017 struct flowi6 fl6
= {
1018 .flowi6_iif
= skb
->dev
->ifindex
,
1019 .daddr
= iph
->daddr
,
1020 .saddr
= iph
->saddr
,
1021 .flowlabel
= ip6_flowinfo(iph
),
1022 .flowi6_mark
= skb
->mark
,
1023 .flowi6_proto
= iph
->nexthdr
,
1026 skb_dst_set(skb
, ip6_route_input_lookup(net
, skb
->dev
, &fl6
, flags
));
1029 static struct rt6_info
*ip6_pol_route_output(struct net
*net
, struct fib6_table
*table
,
1030 struct flowi6
*fl6
, int flags
)
1032 return ip6_pol_route(net
, table
, fl6
->flowi6_oif
, fl6
, flags
);
1035 struct dst_entry
*ip6_route_output(struct net
*net
, const struct sock
*sk
,
1040 fl6
->flowi6_iif
= LOOPBACK_IFINDEX
;
1042 if ((sk
&& sk
->sk_bound_dev_if
) || rt6_need_strict(&fl6
->daddr
))
1043 flags
|= RT6_LOOKUP_F_IFACE
;
1045 if (!ipv6_addr_any(&fl6
->saddr
))
1046 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
1048 flags
|= rt6_srcprefs2flags(inet6_sk(sk
)->srcprefs
);
1050 return fib6_rule_lookup(net
, fl6
, flags
, ip6_pol_route_output
);
1052 EXPORT_SYMBOL(ip6_route_output
);
1054 struct dst_entry
*ip6_blackhole_route(struct net
*net
, struct dst_entry
*dst_orig
)
1056 struct rt6_info
*rt
, *ort
= (struct rt6_info
*) dst_orig
;
1057 struct dst_entry
*new = NULL
;
1059 rt
= dst_alloc(&ip6_dst_blackhole_ops
, ort
->dst
.dev
, 1, DST_OBSOLETE_NONE
, 0);
1063 memset(new + 1, 0, sizeof(*rt
) - sizeof(*new));
1064 rt6_init_peer(rt
, net
->ipv6
.peers
);
1067 new->input
= dst_discard
;
1068 new->output
= dst_discard_sk
;
1070 if (dst_metrics_read_only(&ort
->dst
))
1071 new->_metrics
= ort
->dst
._metrics
;
1073 dst_copy_metrics(new, &ort
->dst
);
1074 rt
->rt6i_idev
= ort
->rt6i_idev
;
1076 in6_dev_hold(rt
->rt6i_idev
);
1078 rt
->rt6i_gateway
= ort
->rt6i_gateway
;
1079 rt
->rt6i_flags
= ort
->rt6i_flags
;
1080 rt
->rt6i_metric
= 0;
1082 memcpy(&rt
->rt6i_dst
, &ort
->rt6i_dst
, sizeof(struct rt6key
));
1083 #ifdef CONFIG_IPV6_SUBTREES
1084 memcpy(&rt
->rt6i_src
, &ort
->rt6i_src
, sizeof(struct rt6key
));
1090 dst_release(dst_orig
);
1091 return new ? new : ERR_PTR(-ENOMEM
);
1095 * Destination cache support functions
1098 static struct dst_entry
*ip6_dst_check(struct dst_entry
*dst
, u32 cookie
)
1100 struct rt6_info
*rt
;
1102 rt
= (struct rt6_info
*) dst
;
1104 /* All IPV6 dsts are created with ->obsolete set to the value
1105 * DST_OBSOLETE_FORCE_CHK which forces validation calls down
1106 * into this function always.
1108 if (!rt
->rt6i_node
|| (rt
->rt6i_node
->fn_sernum
!= cookie
))
1111 if (rt6_check_expired(rt
))
1117 static struct dst_entry
*ip6_negative_advice(struct dst_entry
*dst
)
1119 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
1122 if (rt
->rt6i_flags
& RTF_CACHE
) {
1123 if (rt6_check_expired(rt
)) {
1135 static void ip6_link_failure(struct sk_buff
*skb
)
1137 struct rt6_info
*rt
;
1139 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_ADDR_UNREACH
, 0);
1141 rt
= (struct rt6_info
*) skb_dst(skb
);
1143 if (rt
->rt6i_flags
& RTF_CACHE
) {
1147 } else if (rt
->rt6i_node
&& (rt
->rt6i_flags
& RTF_DEFAULT
)) {
1148 rt
->rt6i_node
->fn_sernum
= -1;
1153 static void ip6_rt_update_pmtu(struct dst_entry
*dst
, struct sock
*sk
,
1154 struct sk_buff
*skb
, u32 mtu
)
1156 struct rt6_info
*rt6
= (struct rt6_info
*)dst
;
1159 if (mtu
< dst_mtu(dst
) && rt6
->rt6i_dst
.plen
== 128) {
1160 struct net
*net
= dev_net(dst
->dev
);
1162 rt6
->rt6i_flags
|= RTF_MODIFIED
;
1163 if (mtu
< IPV6_MIN_MTU
)
1166 dst_metric_set(dst
, RTAX_MTU
, mtu
);
1167 rt6_update_expires(rt6
, net
->ipv6
.sysctl
.ip6_rt_mtu_expires
);
1171 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
,
1174 const struct ipv6hdr
*iph
= (struct ipv6hdr
*) skb
->data
;
1175 struct dst_entry
*dst
;
1178 memset(&fl6
, 0, sizeof(fl6
));
1179 fl6
.flowi6_oif
= oif
;
1180 fl6
.flowi6_mark
= mark
? mark
: IP6_REPLY_MARK(net
, skb
->mark
);
1181 fl6
.daddr
= iph
->daddr
;
1182 fl6
.saddr
= iph
->saddr
;
1183 fl6
.flowlabel
= ip6_flowinfo(iph
);
1185 dst
= ip6_route_output(net
, NULL
, &fl6
);
1187 ip6_rt_update_pmtu(dst
, NULL
, skb
, ntohl(mtu
));
1190 EXPORT_SYMBOL_GPL(ip6_update_pmtu
);
1192 void ip6_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, __be32 mtu
)
1194 ip6_update_pmtu(skb
, sock_net(sk
), mtu
,
1195 sk
->sk_bound_dev_if
, sk
->sk_mark
);
1197 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu
);
1199 /* Handle redirects */
1200 struct ip6rd_flowi
{
1202 struct in6_addr gateway
;
1205 static struct rt6_info
*__ip6_route_redirect(struct net
*net
,
1206 struct fib6_table
*table
,
1210 struct ip6rd_flowi
*rdfl
= (struct ip6rd_flowi
*)fl6
;
1211 struct rt6_info
*rt
;
1212 struct fib6_node
*fn
;
1214 /* Get the "current" route for this destination and
1215 * check if the redirect has come from approriate router.
1217 * RFC 4861 specifies that redirects should only be
1218 * accepted if they come from the nexthop to the target.
1219 * Due to the way the routes are chosen, this notion
1220 * is a bit fuzzy and one might need to check all possible
1224 read_lock_bh(&table
->tb6_lock
);
1225 fn
= fib6_lookup(&table
->tb6_root
, &fl6
->daddr
, &fl6
->saddr
);
1227 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1228 if (rt6_check_expired(rt
))
1232 if (!(rt
->rt6i_flags
& RTF_GATEWAY
))
1234 if (fl6
->flowi6_oif
!= rt
->dst
.dev
->ifindex
)
1236 if (!ipv6_addr_equal(&rdfl
->gateway
, &rt
->rt6i_gateway
))
1242 rt
= net
->ipv6
.ip6_null_entry
;
1243 else if (rt
->dst
.error
) {
1244 rt
= net
->ipv6
.ip6_null_entry
;
1248 if (rt
== net
->ipv6
.ip6_null_entry
) {
1249 fn
= fib6_backtrack(fn
, &fl6
->saddr
);
1257 read_unlock_bh(&table
->tb6_lock
);
1262 static struct dst_entry
*ip6_route_redirect(struct net
*net
,
1263 const struct flowi6
*fl6
,
1264 const struct in6_addr
*gateway
)
1266 int flags
= RT6_LOOKUP_F_HAS_SADDR
;
1267 struct ip6rd_flowi rdfl
;
1270 rdfl
.gateway
= *gateway
;
1272 return fib6_rule_lookup(net
, &rdfl
.fl6
,
1273 flags
, __ip6_route_redirect
);
1276 void ip6_redirect(struct sk_buff
*skb
, struct net
*net
, int oif
, u32 mark
)
1278 const struct ipv6hdr
*iph
= (struct ipv6hdr
*) skb
->data
;
1279 struct dst_entry
*dst
;
1282 memset(&fl6
, 0, sizeof(fl6
));
1283 fl6
.flowi6_iif
= LOOPBACK_IFINDEX
;
1284 fl6
.flowi6_oif
= oif
;
1285 fl6
.flowi6_mark
= mark
;
1286 fl6
.daddr
= iph
->daddr
;
1287 fl6
.saddr
= iph
->saddr
;
1288 fl6
.flowlabel
= ip6_flowinfo(iph
);
1290 dst
= ip6_route_redirect(net
, &fl6
, &ipv6_hdr(skb
)->saddr
);
1291 rt6_do_redirect(dst
, NULL
, skb
);
1294 EXPORT_SYMBOL_GPL(ip6_redirect
);
1296 void ip6_redirect_no_header(struct sk_buff
*skb
, struct net
*net
, int oif
,
1299 const struct ipv6hdr
*iph
= ipv6_hdr(skb
);
1300 const struct rd_msg
*msg
= (struct rd_msg
*)icmp6_hdr(skb
);
1301 struct dst_entry
*dst
;
1304 memset(&fl6
, 0, sizeof(fl6
));
1305 fl6
.flowi6_iif
= LOOPBACK_IFINDEX
;
1306 fl6
.flowi6_oif
= oif
;
1307 fl6
.flowi6_mark
= mark
;
1308 fl6
.daddr
= msg
->dest
;
1309 fl6
.saddr
= iph
->daddr
;
1311 dst
= ip6_route_redirect(net
, &fl6
, &iph
->saddr
);
1312 rt6_do_redirect(dst
, NULL
, skb
);
1316 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
)
1318 ip6_redirect(skb
, sock_net(sk
), sk
->sk_bound_dev_if
, sk
->sk_mark
);
1320 EXPORT_SYMBOL_GPL(ip6_sk_redirect
);
1322 static unsigned int ip6_default_advmss(const struct dst_entry
*dst
)
1324 struct net_device
*dev
= dst
->dev
;
1325 unsigned int mtu
= dst_mtu(dst
);
1326 struct net
*net
= dev_net(dev
);
1328 mtu
-= sizeof(struct ipv6hdr
) + sizeof(struct tcphdr
);
1330 if (mtu
< net
->ipv6
.sysctl
.ip6_rt_min_advmss
)
1331 mtu
= net
->ipv6
.sysctl
.ip6_rt_min_advmss
;
1334 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
1335 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
1336 * IPV6_MAXPLEN is also valid and means: "any MSS,
1337 * rely only on pmtu discovery"
1339 if (mtu
> IPV6_MAXPLEN
- sizeof(struct tcphdr
))
1344 static unsigned int ip6_mtu(const struct dst_entry
*dst
)
1346 struct inet6_dev
*idev
;
1347 unsigned int mtu
= dst_metric_raw(dst
, RTAX_MTU
);
1355 idev
= __in6_dev_get(dst
->dev
);
1357 mtu
= idev
->cnf
.mtu6
;
1361 return min_t(unsigned int, mtu
, IP6_MAX_MTU
);
1364 static struct dst_entry
*icmp6_dst_gc_list
;
1365 static DEFINE_SPINLOCK(icmp6_dst_lock
);
1367 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
,
1370 struct dst_entry
*dst
;
1371 struct rt6_info
*rt
;
1372 struct inet6_dev
*idev
= in6_dev_get(dev
);
1373 struct net
*net
= dev_net(dev
);
1375 if (unlikely(!idev
))
1376 return ERR_PTR(-ENODEV
);
1378 rt
= ip6_dst_alloc(net
, dev
, 0, NULL
);
1379 if (unlikely(!rt
)) {
1381 dst
= ERR_PTR(-ENOMEM
);
1385 rt
->dst
.flags
|= DST_HOST
;
1386 rt
->dst
.output
= ip6_output
;
1387 atomic_set(&rt
->dst
.__refcnt
, 1);
1388 rt
->rt6i_gateway
= fl6
->daddr
;
1389 rt
->rt6i_dst
.addr
= fl6
->daddr
;
1390 rt
->rt6i_dst
.plen
= 128;
1391 rt
->rt6i_idev
= idev
;
1392 dst_metric_set(&rt
->dst
, RTAX_HOPLIMIT
, 0);
1394 spin_lock_bh(&icmp6_dst_lock
);
1395 rt
->dst
.next
= icmp6_dst_gc_list
;
1396 icmp6_dst_gc_list
= &rt
->dst
;
1397 spin_unlock_bh(&icmp6_dst_lock
);
1399 fib6_force_start_gc(net
);
1401 dst
= xfrm_lookup(net
, &rt
->dst
, flowi6_to_flowi(fl6
), NULL
, 0);
1407 int icmp6_dst_gc(void)
1409 struct dst_entry
*dst
, **pprev
;
1412 spin_lock_bh(&icmp6_dst_lock
);
1413 pprev
= &icmp6_dst_gc_list
;
1415 while ((dst
= *pprev
) != NULL
) {
1416 if (!atomic_read(&dst
->__refcnt
)) {
1425 spin_unlock_bh(&icmp6_dst_lock
);
1430 static void icmp6_clean_all(int (*func
)(struct rt6_info
*rt
, void *arg
),
1433 struct dst_entry
*dst
, **pprev
;
1435 spin_lock_bh(&icmp6_dst_lock
);
1436 pprev
= &icmp6_dst_gc_list
;
1437 while ((dst
= *pprev
) != NULL
) {
1438 struct rt6_info
*rt
= (struct rt6_info
*) dst
;
1439 if (func(rt
, arg
)) {
1446 spin_unlock_bh(&icmp6_dst_lock
);
1449 static int ip6_dst_gc(struct dst_ops
*ops
)
1451 struct net
*net
= container_of(ops
, struct net
, ipv6
.ip6_dst_ops
);
1452 int rt_min_interval
= net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
1453 int rt_max_size
= net
->ipv6
.sysctl
.ip6_rt_max_size
;
1454 int rt_elasticity
= net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
;
1455 int rt_gc_timeout
= net
->ipv6
.sysctl
.ip6_rt_gc_timeout
;
1456 unsigned long rt_last_gc
= net
->ipv6
.ip6_rt_last_gc
;
1459 entries
= dst_entries_get_fast(ops
);
1460 if (time_after(rt_last_gc
+ rt_min_interval
, jiffies
) &&
1461 entries
<= rt_max_size
)
1464 net
->ipv6
.ip6_rt_gc_expire
++;
1465 fib6_run_gc(net
->ipv6
.ip6_rt_gc_expire
, net
, true);
1466 entries
= dst_entries_get_slow(ops
);
1467 if (entries
< ops
->gc_thresh
)
1468 net
->ipv6
.ip6_rt_gc_expire
= rt_gc_timeout
>>1;
1470 net
->ipv6
.ip6_rt_gc_expire
-= net
->ipv6
.ip6_rt_gc_expire
>>rt_elasticity
;
1471 return entries
> rt_max_size
;
1478 int ip6_route_add(struct fib6_config
*cfg
)
1481 struct net
*net
= cfg
->fc_nlinfo
.nl_net
;
1482 struct rt6_info
*rt
= NULL
;
1483 struct net_device
*dev
= NULL
;
1484 struct inet6_dev
*idev
= NULL
;
1485 struct fib6_table
*table
;
1488 if (cfg
->fc_dst_len
> 128 || cfg
->fc_src_len
> 128)
1490 #ifndef CONFIG_IPV6_SUBTREES
1491 if (cfg
->fc_src_len
)
1494 if (cfg
->fc_ifindex
) {
1496 dev
= dev_get_by_index(net
, cfg
->fc_ifindex
);
1499 idev
= in6_dev_get(dev
);
1504 if (cfg
->fc_metric
== 0)
1505 cfg
->fc_metric
= IP6_RT_PRIO_USER
;
1508 if (cfg
->fc_nlinfo
.nlh
&&
1509 !(cfg
->fc_nlinfo
.nlh
->nlmsg_flags
& NLM_F_CREATE
)) {
1510 table
= fib6_get_table(net
, cfg
->fc_table
);
1512 pr_warn("NLM_F_CREATE should be specified when creating new route\n");
1513 table
= fib6_new_table(net
, cfg
->fc_table
);
1516 table
= fib6_new_table(net
, cfg
->fc_table
);
1522 rt
= ip6_dst_alloc(net
, NULL
, (cfg
->fc_flags
& RTF_ADDRCONF
) ? 0 : DST_NOCOUNT
, table
);
1529 if (cfg
->fc_flags
& RTF_EXPIRES
)
1530 rt6_set_expires(rt
, jiffies
+
1531 clock_t_to_jiffies(cfg
->fc_expires
));
1533 rt6_clean_expires(rt
);
1535 if (cfg
->fc_protocol
== RTPROT_UNSPEC
)
1536 cfg
->fc_protocol
= RTPROT_BOOT
;
1537 rt
->rt6i_protocol
= cfg
->fc_protocol
;
1539 addr_type
= ipv6_addr_type(&cfg
->fc_dst
);
1541 if (addr_type
& IPV6_ADDR_MULTICAST
)
1542 rt
->dst
.input
= ip6_mc_input
;
1543 else if (cfg
->fc_flags
& RTF_LOCAL
)
1544 rt
->dst
.input
= ip6_input
;
1546 rt
->dst
.input
= ip6_forward
;
1548 rt
->dst
.output
= ip6_output
;
1550 ipv6_addr_prefix(&rt
->rt6i_dst
.addr
, &cfg
->fc_dst
, cfg
->fc_dst_len
);
1551 rt
->rt6i_dst
.plen
= cfg
->fc_dst_len
;
1552 if (rt
->rt6i_dst
.plen
== 128) {
1553 rt
->dst
.flags
|= DST_HOST
;
1554 dst_metrics_set_force_overwrite(&rt
->dst
);
1557 #ifdef CONFIG_IPV6_SUBTREES
1558 ipv6_addr_prefix(&rt
->rt6i_src
.addr
, &cfg
->fc_src
, cfg
->fc_src_len
);
1559 rt
->rt6i_src
.plen
= cfg
->fc_src_len
;
1562 rt
->rt6i_metric
= cfg
->fc_metric
;
1564 /* We cannot add true routes via loopback here,
1565 they would result in kernel looping; promote them to reject routes
1567 if ((cfg
->fc_flags
& RTF_REJECT
) ||
1568 (dev
&& (dev
->flags
& IFF_LOOPBACK
) &&
1569 !(addr_type
& IPV6_ADDR_LOOPBACK
) &&
1570 !(cfg
->fc_flags
& RTF_LOCAL
))) {
1571 /* hold loopback dev/idev if we haven't done so. */
1572 if (dev
!= net
->loopback_dev
) {
1577 dev
= net
->loopback_dev
;
1579 idev
= in6_dev_get(dev
);
1585 rt
->rt6i_flags
= RTF_REJECT
|RTF_NONEXTHOP
;
1586 switch (cfg
->fc_type
) {
1588 rt
->dst
.error
= -EINVAL
;
1589 rt
->dst
.output
= dst_discard_sk
;
1590 rt
->dst
.input
= dst_discard
;
1593 rt
->dst
.error
= -EACCES
;
1594 rt
->dst
.output
= ip6_pkt_prohibit_out
;
1595 rt
->dst
.input
= ip6_pkt_prohibit
;
1599 rt
->dst
.error
= (cfg
->fc_type
== RTN_THROW
) ? -EAGAIN
1601 rt
->dst
.output
= ip6_pkt_discard_out
;
1602 rt
->dst
.input
= ip6_pkt_discard
;
1608 if (cfg
->fc_flags
& RTF_GATEWAY
) {
1609 const struct in6_addr
*gw_addr
;
1612 gw_addr
= &cfg
->fc_gateway
;
1613 rt
->rt6i_gateway
= *gw_addr
;
1614 gwa_type
= ipv6_addr_type(gw_addr
);
1616 if (gwa_type
!= (IPV6_ADDR_LINKLOCAL
|IPV6_ADDR_UNICAST
)) {
1617 struct rt6_info
*grt
;
1619 /* IPv6 strictly inhibits using not link-local
1620 addresses as nexthop address.
1621 Otherwise, router will not able to send redirects.
1622 It is very good, but in some (rare!) circumstances
1623 (SIT, PtP, NBMA NOARP links) it is handy to allow
1624 some exceptions. --ANK
1627 if (!(gwa_type
& IPV6_ADDR_UNICAST
))
1630 grt
= rt6_lookup(net
, gw_addr
, NULL
, cfg
->fc_ifindex
, 1);
1632 err
= -EHOSTUNREACH
;
1636 if (dev
!= grt
->dst
.dev
) {
1642 idev
= grt
->rt6i_idev
;
1644 in6_dev_hold(grt
->rt6i_idev
);
1646 if (!(grt
->rt6i_flags
& RTF_GATEWAY
))
1654 if (!dev
|| (dev
->flags
& IFF_LOOPBACK
))
1662 if (!ipv6_addr_any(&cfg
->fc_prefsrc
)) {
1663 if (!ipv6_chk_addr(net
, &cfg
->fc_prefsrc
, dev
, 0)) {
1667 rt
->rt6i_prefsrc
.addr
= cfg
->fc_prefsrc
;
1668 rt
->rt6i_prefsrc
.plen
= 128;
1670 rt
->rt6i_prefsrc
.plen
= 0;
1672 rt
->rt6i_flags
= cfg
->fc_flags
;
1676 rt
->rt6i_idev
= idev
;
1677 rt
->rt6i_table
= table
;
1679 cfg
->fc_nlinfo
.nl_net
= dev_net(dev
);
1681 return __ip6_ins_rt(rt
, &cfg
->fc_nlinfo
, cfg
->fc_mx
, cfg
->fc_mx_len
);
1693 static int __ip6_del_rt(struct rt6_info
*rt
, struct nl_info
*info
)
1696 struct fib6_table
*table
;
1697 struct net
*net
= dev_net(rt
->dst
.dev
);
1699 if (rt
== net
->ipv6
.ip6_null_entry
) {
1704 table
= rt
->rt6i_table
;
1705 write_lock_bh(&table
->tb6_lock
);
1706 err
= fib6_del(rt
, info
);
1707 write_unlock_bh(&table
->tb6_lock
);
1714 int ip6_del_rt(struct rt6_info
*rt
)
1716 struct nl_info info
= {
1717 .nl_net
= dev_net(rt
->dst
.dev
),
1719 return __ip6_del_rt(rt
, &info
);
1722 static int ip6_route_del(struct fib6_config
*cfg
)
1724 struct fib6_table
*table
;
1725 struct fib6_node
*fn
;
1726 struct rt6_info
*rt
;
1729 table
= fib6_get_table(cfg
->fc_nlinfo
.nl_net
, cfg
->fc_table
);
1733 read_lock_bh(&table
->tb6_lock
);
1735 fn
= fib6_locate(&table
->tb6_root
,
1736 &cfg
->fc_dst
, cfg
->fc_dst_len
,
1737 &cfg
->fc_src
, cfg
->fc_src_len
);
1740 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1741 if (cfg
->fc_ifindex
&&
1743 rt
->dst
.dev
->ifindex
!= cfg
->fc_ifindex
))
1745 if (cfg
->fc_flags
& RTF_GATEWAY
&&
1746 !ipv6_addr_equal(&cfg
->fc_gateway
, &rt
->rt6i_gateway
))
1748 if (cfg
->fc_metric
&& cfg
->fc_metric
!= rt
->rt6i_metric
)
1751 read_unlock_bh(&table
->tb6_lock
);
1753 return __ip6_del_rt(rt
, &cfg
->fc_nlinfo
);
1756 read_unlock_bh(&table
->tb6_lock
);
1761 static void rt6_do_redirect(struct dst_entry
*dst
, struct sock
*sk
, struct sk_buff
*skb
)
1763 struct net
*net
= dev_net(skb
->dev
);
1764 struct netevent_redirect netevent
;
1765 struct rt6_info
*rt
, *nrt
= NULL
;
1766 struct ndisc_options ndopts
;
1767 struct inet6_dev
*in6_dev
;
1768 struct neighbour
*neigh
;
1770 int optlen
, on_link
;
1773 optlen
= skb_tail_pointer(skb
) - skb_transport_header(skb
);
1774 optlen
-= sizeof(*msg
);
1777 net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
1781 msg
= (struct rd_msg
*)icmp6_hdr(skb
);
1783 if (ipv6_addr_is_multicast(&msg
->dest
)) {
1784 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
1789 if (ipv6_addr_equal(&msg
->dest
, &msg
->target
)) {
1791 } else if (ipv6_addr_type(&msg
->target
) !=
1792 (IPV6_ADDR_UNICAST
|IPV6_ADDR_LINKLOCAL
)) {
1793 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
1797 in6_dev
= __in6_dev_get(skb
->dev
);
1800 if (in6_dev
->cnf
.forwarding
|| !in6_dev
->cnf
.accept_redirects
)
1804 * The IP source address of the Redirect MUST be the same as the current
1805 * first-hop router for the specified ICMP Destination Address.
1808 if (!ndisc_parse_options(msg
->opt
, optlen
, &ndopts
)) {
1809 net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
1814 if (ndopts
.nd_opts_tgt_lladdr
) {
1815 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_tgt_lladdr
,
1818 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
1823 rt
= (struct rt6_info
*) dst
;
1824 if (rt
== net
->ipv6
.ip6_null_entry
) {
1825 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
1829 /* Redirect received -> path was valid.
1830 * Look, redirects are sent only in response to data packets,
1831 * so that this nexthop apparently is reachable. --ANK
1833 dst_confirm(&rt
->dst
);
1835 neigh
= __neigh_lookup(&nd_tbl
, &msg
->target
, skb
->dev
, 1);
1840 * We have finally decided to accept it.
1843 neigh_update(neigh
, lladdr
, NUD_STALE
,
1844 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
1845 NEIGH_UPDATE_F_OVERRIDE
|
1846 (on_link
? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER
|
1847 NEIGH_UPDATE_F_ISROUTER
))
1850 nrt
= ip6_rt_copy(rt
, &msg
->dest
);
1854 nrt
->rt6i_flags
= RTF_GATEWAY
|RTF_UP
|RTF_DYNAMIC
|RTF_CACHE
;
1856 nrt
->rt6i_flags
&= ~RTF_GATEWAY
;
1858 nrt
->rt6i_gateway
= *(struct in6_addr
*)neigh
->primary_key
;
1860 if (ip6_ins_rt(nrt
))
1863 netevent
.old
= &rt
->dst
;
1864 netevent
.new = &nrt
->dst
;
1865 netevent
.daddr
= &msg
->dest
;
1866 netevent
.neigh
= neigh
;
1867 call_netevent_notifiers(NETEVENT_REDIRECT
, &netevent
);
1869 if (rt
->rt6i_flags
& RTF_CACHE
) {
1870 rt
= (struct rt6_info
*) dst_clone(&rt
->dst
);
1875 neigh_release(neigh
);
1879 * Misc support functions
1882 static struct rt6_info
*ip6_rt_copy(struct rt6_info
*ort
,
1883 const struct in6_addr
*dest
)
1885 struct net
*net
= dev_net(ort
->dst
.dev
);
1886 struct rt6_info
*rt
= ip6_dst_alloc(net
, ort
->dst
.dev
, 0,
1890 rt
->dst
.input
= ort
->dst
.input
;
1891 rt
->dst
.output
= ort
->dst
.output
;
1892 rt
->dst
.flags
|= DST_HOST
;
1894 rt
->rt6i_dst
.addr
= *dest
;
1895 rt
->rt6i_dst
.plen
= 128;
1896 dst_copy_metrics(&rt
->dst
, &ort
->dst
);
1897 rt
->dst
.error
= ort
->dst
.error
;
1898 rt
->rt6i_idev
= ort
->rt6i_idev
;
1900 in6_dev_hold(rt
->rt6i_idev
);
1901 rt
->dst
.lastuse
= jiffies
;
1903 if (ort
->rt6i_flags
& RTF_GATEWAY
)
1904 rt
->rt6i_gateway
= ort
->rt6i_gateway
;
1906 rt
->rt6i_gateway
= *dest
;
1907 rt
->rt6i_flags
= ort
->rt6i_flags
;
1908 rt6_set_from(rt
, ort
);
1909 rt
->rt6i_metric
= 0;
1911 #ifdef CONFIG_IPV6_SUBTREES
1912 memcpy(&rt
->rt6i_src
, &ort
->rt6i_src
, sizeof(struct rt6key
));
1914 memcpy(&rt
->rt6i_prefsrc
, &ort
->rt6i_prefsrc
, sizeof(struct rt6key
));
1915 rt
->rt6i_table
= ort
->rt6i_table
;
1920 #ifdef CONFIG_IPV6_ROUTE_INFO
1921 static struct rt6_info
*rt6_get_route_info(struct net
*net
,
1922 const struct in6_addr
*prefix
, int prefixlen
,
1923 const struct in6_addr
*gwaddr
, int ifindex
)
1925 struct fib6_node
*fn
;
1926 struct rt6_info
*rt
= NULL
;
1927 struct fib6_table
*table
;
1929 table
= fib6_get_table(net
, RT6_TABLE_INFO
);
1933 read_lock_bh(&table
->tb6_lock
);
1934 fn
= fib6_locate(&table
->tb6_root
, prefix
, prefixlen
, NULL
, 0);
1938 for (rt
= fn
->leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1939 if (rt
->dst
.dev
->ifindex
!= ifindex
)
1941 if ((rt
->rt6i_flags
& (RTF_ROUTEINFO
|RTF_GATEWAY
)) != (RTF_ROUTEINFO
|RTF_GATEWAY
))
1943 if (!ipv6_addr_equal(&rt
->rt6i_gateway
, gwaddr
))
1949 read_unlock_bh(&table
->tb6_lock
);
1953 static struct rt6_info
*rt6_add_route_info(struct net
*net
,
1954 const struct in6_addr
*prefix
, int prefixlen
,
1955 const struct in6_addr
*gwaddr
, int ifindex
,
1958 struct fib6_config cfg
= {
1959 .fc_table
= RT6_TABLE_INFO
,
1960 .fc_metric
= IP6_RT_PRIO_USER
,
1961 .fc_ifindex
= ifindex
,
1962 .fc_dst_len
= prefixlen
,
1963 .fc_flags
= RTF_GATEWAY
| RTF_ADDRCONF
| RTF_ROUTEINFO
|
1964 RTF_UP
| RTF_PREF(pref
),
1965 .fc_nlinfo
.portid
= 0,
1966 .fc_nlinfo
.nlh
= NULL
,
1967 .fc_nlinfo
.nl_net
= net
,
1970 cfg
.fc_dst
= *prefix
;
1971 cfg
.fc_gateway
= *gwaddr
;
1973 /* We should treat it as a default route if prefix length is 0. */
1975 cfg
.fc_flags
|= RTF_DEFAULT
;
1977 ip6_route_add(&cfg
);
1979 return rt6_get_route_info(net
, prefix
, prefixlen
, gwaddr
, ifindex
);
1983 struct rt6_info
*rt6_get_dflt_router(const struct in6_addr
*addr
, struct net_device
*dev
)
1985 struct rt6_info
*rt
;
1986 struct fib6_table
*table
;
1988 table
= fib6_get_table(dev_net(dev
), RT6_TABLE_DFLT
);
1992 read_lock_bh(&table
->tb6_lock
);
1993 for (rt
= table
->tb6_root
.leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
1994 if (dev
== rt
->dst
.dev
&&
1995 ((rt
->rt6i_flags
& (RTF_ADDRCONF
| RTF_DEFAULT
)) == (RTF_ADDRCONF
| RTF_DEFAULT
)) &&
1996 ipv6_addr_equal(&rt
->rt6i_gateway
, addr
))
2001 read_unlock_bh(&table
->tb6_lock
);
2005 struct rt6_info
*rt6_add_dflt_router(const struct in6_addr
*gwaddr
,
2006 struct net_device
*dev
,
2009 struct fib6_config cfg
= {
2010 .fc_table
= RT6_TABLE_DFLT
,
2011 .fc_metric
= IP6_RT_PRIO_USER
,
2012 .fc_ifindex
= dev
->ifindex
,
2013 .fc_flags
= RTF_GATEWAY
| RTF_ADDRCONF
| RTF_DEFAULT
|
2014 RTF_UP
| RTF_EXPIRES
| RTF_PREF(pref
),
2015 .fc_nlinfo
.portid
= 0,
2016 .fc_nlinfo
.nlh
= NULL
,
2017 .fc_nlinfo
.nl_net
= dev_net(dev
),
2020 cfg
.fc_gateway
= *gwaddr
;
2022 ip6_route_add(&cfg
);
2024 return rt6_get_dflt_router(gwaddr
, dev
);
2027 void rt6_purge_dflt_routers(struct net
*net
)
2029 struct rt6_info
*rt
;
2030 struct fib6_table
*table
;
2032 /* NOTE: Keep consistent with rt6_get_dflt_router */
2033 table
= fib6_get_table(net
, RT6_TABLE_DFLT
);
2038 read_lock_bh(&table
->tb6_lock
);
2039 for (rt
= table
->tb6_root
.leaf
; rt
; rt
= rt
->dst
.rt6_next
) {
2040 if (rt
->rt6i_flags
& (RTF_DEFAULT
| RTF_ADDRCONF
) &&
2041 (!rt
->rt6i_idev
|| rt
->rt6i_idev
->cnf
.accept_ra
!= 2)) {
2043 read_unlock_bh(&table
->tb6_lock
);
2048 read_unlock_bh(&table
->tb6_lock
);
2051 static void rtmsg_to_fib6_config(struct net
*net
,
2052 struct in6_rtmsg
*rtmsg
,
2053 struct fib6_config
*cfg
)
2055 memset(cfg
, 0, sizeof(*cfg
));
2057 cfg
->fc_table
= RT6_TABLE_MAIN
;
2058 cfg
->fc_ifindex
= rtmsg
->rtmsg_ifindex
;
2059 cfg
->fc_metric
= rtmsg
->rtmsg_metric
;
2060 cfg
->fc_expires
= rtmsg
->rtmsg_info
;
2061 cfg
->fc_dst_len
= rtmsg
->rtmsg_dst_len
;
2062 cfg
->fc_src_len
= rtmsg
->rtmsg_src_len
;
2063 cfg
->fc_flags
= rtmsg
->rtmsg_flags
;
2065 cfg
->fc_nlinfo
.nl_net
= net
;
2067 cfg
->fc_dst
= rtmsg
->rtmsg_dst
;
2068 cfg
->fc_src
= rtmsg
->rtmsg_src
;
2069 cfg
->fc_gateway
= rtmsg
->rtmsg_gateway
;
2072 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
)
2074 struct fib6_config cfg
;
2075 struct in6_rtmsg rtmsg
;
2079 case SIOCADDRT
: /* Add a route */
2080 case SIOCDELRT
: /* Delete a route */
2081 if (!ns_capable(net
->user_ns
, CAP_NET_ADMIN
))
2083 err
= copy_from_user(&rtmsg
, arg
,
2084 sizeof(struct in6_rtmsg
));
2088 rtmsg_to_fib6_config(net
, &rtmsg
, &cfg
);
2093 err
= ip6_route_add(&cfg
);
2096 err
= ip6_route_del(&cfg
);
2110 * Drop the packet on the floor
2113 static int ip6_pkt_drop(struct sk_buff
*skb
, u8 code
, int ipstats_mib_noroutes
)
2116 struct dst_entry
*dst
= skb_dst(skb
);
2117 switch (ipstats_mib_noroutes
) {
2118 case IPSTATS_MIB_INNOROUTES
:
2119 type
= ipv6_addr_type(&ipv6_hdr(skb
)->daddr
);
2120 if (type
== IPV6_ADDR_ANY
) {
2121 IP6_INC_STATS(dev_net(dst
->dev
), ip6_dst_idev(dst
),
2122 IPSTATS_MIB_INADDRERRORS
);
2126 case IPSTATS_MIB_OUTNOROUTES
:
2127 IP6_INC_STATS(dev_net(dst
->dev
), ip6_dst_idev(dst
),
2128 ipstats_mib_noroutes
);
2131 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, code
, 0);
2136 static int ip6_pkt_discard(struct sk_buff
*skb
)
2138 return ip6_pkt_drop(skb
, ICMPV6_NOROUTE
, IPSTATS_MIB_INNOROUTES
);
2141 static int ip6_pkt_discard_out(struct sock
*sk
, struct sk_buff
*skb
)
2143 skb
->dev
= skb_dst(skb
)->dev
;
2144 return ip6_pkt_drop(skb
, ICMPV6_NOROUTE
, IPSTATS_MIB_OUTNOROUTES
);
2147 static int ip6_pkt_prohibit(struct sk_buff
*skb
)
2149 return ip6_pkt_drop(skb
, ICMPV6_ADM_PROHIBITED
, IPSTATS_MIB_INNOROUTES
);
2152 static int ip6_pkt_prohibit_out(struct sock
*sk
, struct sk_buff
*skb
)
2154 skb
->dev
= skb_dst(skb
)->dev
;
2155 return ip6_pkt_drop(skb
, ICMPV6_ADM_PROHIBITED
, IPSTATS_MIB_OUTNOROUTES
);
2159 * Allocate a dst for local (unicast / anycast) address.
2162 struct rt6_info
*addrconf_dst_alloc(struct inet6_dev
*idev
,
2163 const struct in6_addr
*addr
,
2166 struct net
*net
= dev_net(idev
->dev
);
2167 struct rt6_info
*rt
= ip6_dst_alloc(net
, net
->loopback_dev
,
2170 return ERR_PTR(-ENOMEM
);
2174 rt
->dst
.flags
|= DST_HOST
;
2175 rt
->dst
.input
= ip6_input
;
2176 rt
->dst
.output
= ip6_output
;
2177 rt
->rt6i_idev
= idev
;
2179 rt
->rt6i_flags
= RTF_UP
| RTF_NONEXTHOP
;
2181 rt
->rt6i_flags
|= RTF_ANYCAST
;
2183 rt
->rt6i_flags
|= RTF_LOCAL
;
2185 rt
->rt6i_gateway
= *addr
;
2186 rt
->rt6i_dst
.addr
= *addr
;
2187 rt
->rt6i_dst
.plen
= 128;
2188 rt
->rt6i_table
= fib6_get_table(net
, RT6_TABLE_LOCAL
);
2190 atomic_set(&rt
->dst
.__refcnt
, 1);
2195 int ip6_route_get_saddr(struct net
*net
,
2196 struct rt6_info
*rt
,
2197 const struct in6_addr
*daddr
,
2199 struct in6_addr
*saddr
)
2201 struct inet6_dev
*idev
= ip6_dst_idev((struct dst_entry
*)rt
);
2203 if (rt
->rt6i_prefsrc
.plen
)
2204 *saddr
= rt
->rt6i_prefsrc
.addr
;
2206 err
= ipv6_dev_get_saddr(net
, idev
? idev
->dev
: NULL
,
2207 daddr
, prefs
, saddr
);
2211 /* remove deleted ip from prefsrc entries */
2212 struct arg_dev_net_ip
{
2213 struct net_device
*dev
;
2215 struct in6_addr
*addr
;
2218 static int fib6_remove_prefsrc(struct rt6_info
*rt
, void *arg
)
2220 struct net_device
*dev
= ((struct arg_dev_net_ip
*)arg
)->dev
;
2221 struct net
*net
= ((struct arg_dev_net_ip
*)arg
)->net
;
2222 struct in6_addr
*addr
= ((struct arg_dev_net_ip
*)arg
)->addr
;
2224 if (((void *)rt
->dst
.dev
== dev
|| !dev
) &&
2225 rt
!= net
->ipv6
.ip6_null_entry
&&
2226 ipv6_addr_equal(addr
, &rt
->rt6i_prefsrc
.addr
)) {
2227 /* remove prefsrc entry */
2228 rt
->rt6i_prefsrc
.plen
= 0;
2233 void rt6_remove_prefsrc(struct inet6_ifaddr
*ifp
)
2235 struct net
*net
= dev_net(ifp
->idev
->dev
);
2236 struct arg_dev_net_ip adni
= {
2237 .dev
= ifp
->idev
->dev
,
2241 fib6_clean_all(net
, fib6_remove_prefsrc
, &adni
);
2244 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
2245 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
2247 /* Remove routers and update dst entries when gateway turn into host. */
2248 static int fib6_clean_tohost(struct rt6_info
*rt
, void *arg
)
2250 struct in6_addr
*gateway
= (struct in6_addr
*)arg
;
2252 if ((((rt
->rt6i_flags
& RTF_RA_ROUTER
) == RTF_RA_ROUTER
) ||
2253 ((rt
->rt6i_flags
& RTF_CACHE_GATEWAY
) == RTF_CACHE_GATEWAY
)) &&
2254 ipv6_addr_equal(gateway
, &rt
->rt6i_gateway
)) {
2260 void rt6_clean_tohost(struct net
*net
, struct in6_addr
*gateway
)
2262 fib6_clean_all(net
, fib6_clean_tohost
, gateway
);
2265 struct arg_dev_net
{
2266 struct net_device
*dev
;
2270 static int fib6_ifdown(struct rt6_info
*rt
, void *arg
)
2272 const struct arg_dev_net
*adn
= arg
;
2273 const struct net_device
*dev
= adn
->dev
;
2275 if ((rt
->dst
.dev
== dev
|| !dev
) &&
2276 rt
!= adn
->net
->ipv6
.ip6_null_entry
)
2282 void rt6_ifdown(struct net
*net
, struct net_device
*dev
)
2284 struct arg_dev_net adn
= {
2289 fib6_clean_all(net
, fib6_ifdown
, &adn
);
2290 icmp6_clean_all(fib6_ifdown
, &adn
);
2293 struct rt6_mtu_change_arg
{
2294 struct net_device
*dev
;
2298 static int rt6_mtu_change_route(struct rt6_info
*rt
, void *p_arg
)
2300 struct rt6_mtu_change_arg
*arg
= (struct rt6_mtu_change_arg
*) p_arg
;
2301 struct inet6_dev
*idev
;
2303 /* In IPv6 pmtu discovery is not optional,
2304 so that RTAX_MTU lock cannot disable it.
2305 We still use this lock to block changes
2306 caused by addrconf/ndisc.
2309 idev
= __in6_dev_get(arg
->dev
);
2313 /* For administrative MTU increase, there is no way to discover
2314 IPv6 PMTU increase, so PMTU increase should be updated here.
2315 Since RFC 1981 doesn't include administrative MTU increase
2316 update PMTU increase is a MUST. (i.e. jumbo frame)
2319 If new MTU is less than route PMTU, this new MTU will be the
2320 lowest MTU in the path, update the route PMTU to reflect PMTU
2321 decreases; if new MTU is greater than route PMTU, and the
2322 old MTU is the lowest MTU in the path, update the route PMTU
2323 to reflect the increase. In this case if the other nodes' MTU
2324 also have the lowest MTU, TOO BIG MESSAGE will be lead to
2327 if (rt
->dst
.dev
== arg
->dev
&&
2328 !dst_metric_locked(&rt
->dst
, RTAX_MTU
) &&
2329 (dst_mtu(&rt
->dst
) >= arg
->mtu
||
2330 (dst_mtu(&rt
->dst
) < arg
->mtu
&&
2331 dst_mtu(&rt
->dst
) == idev
->cnf
.mtu6
))) {
2332 dst_metric_set(&rt
->dst
, RTAX_MTU
, arg
->mtu
);
2337 void rt6_mtu_change(struct net_device
*dev
, unsigned int mtu
)
2339 struct rt6_mtu_change_arg arg
= {
2344 fib6_clean_all(dev_net(dev
), rt6_mtu_change_route
, &arg
);
2347 static const struct nla_policy rtm_ipv6_policy
[RTA_MAX
+1] = {
2348 [RTA_GATEWAY
] = { .len
= sizeof(struct in6_addr
) },
2349 [RTA_OIF
] = { .type
= NLA_U32
},
2350 [RTA_IIF
] = { .type
= NLA_U32
},
2351 [RTA_PRIORITY
] = { .type
= NLA_U32
},
2352 [RTA_METRICS
] = { .type
= NLA_NESTED
},
2353 [RTA_MULTIPATH
] = { .len
= sizeof(struct rtnexthop
) },
2356 static int rtm_to_fib6_config(struct sk_buff
*skb
, struct nlmsghdr
*nlh
,
2357 struct fib6_config
*cfg
)
2360 struct nlattr
*tb
[RTA_MAX
+1];
2363 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv6_policy
);
2368 rtm
= nlmsg_data(nlh
);
2369 memset(cfg
, 0, sizeof(*cfg
));
2371 cfg
->fc_table
= rtm
->rtm_table
;
2372 cfg
->fc_dst_len
= rtm
->rtm_dst_len
;
2373 cfg
->fc_src_len
= rtm
->rtm_src_len
;
2374 cfg
->fc_flags
= RTF_UP
;
2375 cfg
->fc_protocol
= rtm
->rtm_protocol
;
2376 cfg
->fc_type
= rtm
->rtm_type
;
2378 if (rtm
->rtm_type
== RTN_UNREACHABLE
||
2379 rtm
->rtm_type
== RTN_BLACKHOLE
||
2380 rtm
->rtm_type
== RTN_PROHIBIT
||
2381 rtm
->rtm_type
== RTN_THROW
)
2382 cfg
->fc_flags
|= RTF_REJECT
;
2384 if (rtm
->rtm_type
== RTN_LOCAL
)
2385 cfg
->fc_flags
|= RTF_LOCAL
;
2387 cfg
->fc_nlinfo
.portid
= NETLINK_CB(skb
).portid
;
2388 cfg
->fc_nlinfo
.nlh
= nlh
;
2389 cfg
->fc_nlinfo
.nl_net
= sock_net(skb
->sk
);
2391 if (tb
[RTA_GATEWAY
]) {
2392 nla_memcpy(&cfg
->fc_gateway
, tb
[RTA_GATEWAY
], 16);
2393 cfg
->fc_flags
|= RTF_GATEWAY
;
2397 int plen
= (rtm
->rtm_dst_len
+ 7) >> 3;
2399 if (nla_len(tb
[RTA_DST
]) < plen
)
2402 nla_memcpy(&cfg
->fc_dst
, tb
[RTA_DST
], plen
);
2406 int plen
= (rtm
->rtm_src_len
+ 7) >> 3;
2408 if (nla_len(tb
[RTA_SRC
]) < plen
)
2411 nla_memcpy(&cfg
->fc_src
, tb
[RTA_SRC
], plen
);
2414 if (tb
[RTA_PREFSRC
])
2415 nla_memcpy(&cfg
->fc_prefsrc
, tb
[RTA_PREFSRC
], 16);
2418 cfg
->fc_ifindex
= nla_get_u32(tb
[RTA_OIF
]);
2420 if (tb
[RTA_PRIORITY
])
2421 cfg
->fc_metric
= nla_get_u32(tb
[RTA_PRIORITY
]);
2423 if (tb
[RTA_METRICS
]) {
2424 cfg
->fc_mx
= nla_data(tb
[RTA_METRICS
]);
2425 cfg
->fc_mx_len
= nla_len(tb
[RTA_METRICS
]);
2429 cfg
->fc_table
= nla_get_u32(tb
[RTA_TABLE
]);
2431 if (tb
[RTA_MULTIPATH
]) {
2432 cfg
->fc_mp
= nla_data(tb
[RTA_MULTIPATH
]);
2433 cfg
->fc_mp_len
= nla_len(tb
[RTA_MULTIPATH
]);
2441 static int ip6_route_multipath(struct fib6_config
*cfg
, int add
)
2443 struct fib6_config r_cfg
;
2444 struct rtnexthop
*rtnh
;
2447 int err
= 0, last_err
= 0;
2450 rtnh
= (struct rtnexthop
*)cfg
->fc_mp
;
2451 remaining
= cfg
->fc_mp_len
;
2453 /* Parse a Multipath Entry */
2454 while (rtnh_ok(rtnh
, remaining
)) {
2455 memcpy(&r_cfg
, cfg
, sizeof(*cfg
));
2456 if (rtnh
->rtnh_ifindex
)
2457 r_cfg
.fc_ifindex
= rtnh
->rtnh_ifindex
;
2459 attrlen
= rtnh_attrlen(rtnh
);
2461 struct nlattr
*nla
, *attrs
= rtnh_attrs(rtnh
);
2463 nla
= nla_find(attrs
, attrlen
, RTA_GATEWAY
);
2465 nla_memcpy(&r_cfg
.fc_gateway
, nla
, 16);
2466 r_cfg
.fc_flags
|= RTF_GATEWAY
;
2469 err
= add
? ip6_route_add(&r_cfg
) : ip6_route_del(&r_cfg
);
2472 /* If we are trying to remove a route, do not stop the
2473 * loop when ip6_route_del() fails (because next hop is
2474 * already gone), we should try to remove all next hops.
2477 /* If add fails, we should try to delete all
2478 * next hops that have been already added.
2484 /* Because each route is added like a single route we remove
2485 * this flag after the first nexthop (if there is a collision,
2486 * we have already fail to add the first nexthop:
2487 * fib6_add_rt2node() has reject it).
2489 cfg
->fc_nlinfo
.nlh
->nlmsg_flags
&= ~NLM_F_EXCL
;
2490 rtnh
= rtnh_next(rtnh
, &remaining
);
2496 static int inet6_rtm_delroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
2498 struct fib6_config cfg
;
2501 err
= rtm_to_fib6_config(skb
, nlh
, &cfg
);
2506 return ip6_route_multipath(&cfg
, 0);
2508 return ip6_route_del(&cfg
);
2511 static int inet6_rtm_newroute(struct sk_buff
*skb
, struct nlmsghdr
*nlh
)
2513 struct fib6_config cfg
;
2516 err
= rtm_to_fib6_config(skb
, nlh
, &cfg
);
2521 return ip6_route_multipath(&cfg
, 1);
2523 return ip6_route_add(&cfg
);
2526 static inline size_t rt6_nlmsg_size(void)
2528 return NLMSG_ALIGN(sizeof(struct rtmsg
))
2529 + nla_total_size(16) /* RTA_SRC */
2530 + nla_total_size(16) /* RTA_DST */
2531 + nla_total_size(16) /* RTA_GATEWAY */
2532 + nla_total_size(16) /* RTA_PREFSRC */
2533 + nla_total_size(4) /* RTA_TABLE */
2534 + nla_total_size(4) /* RTA_IIF */
2535 + nla_total_size(4) /* RTA_OIF */
2536 + nla_total_size(4) /* RTA_PRIORITY */
2537 + RTAX_MAX
* nla_total_size(4) /* RTA_METRICS */
2538 + nla_total_size(sizeof(struct rta_cacheinfo
));
2541 static int rt6_fill_node(struct net
*net
,
2542 struct sk_buff
*skb
, struct rt6_info
*rt
,
2543 struct in6_addr
*dst
, struct in6_addr
*src
,
2544 int iif
, int type
, u32 portid
, u32 seq
,
2545 int prefix
, int nowait
, unsigned int flags
)
2548 struct nlmsghdr
*nlh
;
2552 if (prefix
) { /* user wants prefix routes only */
2553 if (!(rt
->rt6i_flags
& RTF_PREFIX_RT
)) {
2554 /* success since this is not a prefix route */
2559 nlh
= nlmsg_put(skb
, portid
, seq
, type
, sizeof(*rtm
), flags
);
2563 rtm
= nlmsg_data(nlh
);
2564 rtm
->rtm_family
= AF_INET6
;
2565 rtm
->rtm_dst_len
= rt
->rt6i_dst
.plen
;
2566 rtm
->rtm_src_len
= rt
->rt6i_src
.plen
;
2569 table
= rt
->rt6i_table
->tb6_id
;
2571 table
= RT6_TABLE_UNSPEC
;
2572 rtm
->rtm_table
= table
;
2573 if (nla_put_u32(skb
, RTA_TABLE
, table
))
2574 goto nla_put_failure
;
2575 if (rt
->rt6i_flags
& RTF_REJECT
) {
2576 switch (rt
->dst
.error
) {
2578 rtm
->rtm_type
= RTN_BLACKHOLE
;
2581 rtm
->rtm_type
= RTN_PROHIBIT
;
2584 rtm
->rtm_type
= RTN_THROW
;
2587 rtm
->rtm_type
= RTN_UNREACHABLE
;
2591 else if (rt
->rt6i_flags
& RTF_LOCAL
)
2592 rtm
->rtm_type
= RTN_LOCAL
;
2593 else if (rt
->dst
.dev
&& (rt
->dst
.dev
->flags
& IFF_LOOPBACK
))
2594 rtm
->rtm_type
= RTN_LOCAL
;
2596 rtm
->rtm_type
= RTN_UNICAST
;
2598 rtm
->rtm_scope
= RT_SCOPE_UNIVERSE
;
2599 rtm
->rtm_protocol
= rt
->rt6i_protocol
;
2600 if (rt
->rt6i_flags
& RTF_DYNAMIC
)
2601 rtm
->rtm_protocol
= RTPROT_REDIRECT
;
2602 else if (rt
->rt6i_flags
& RTF_ADDRCONF
) {
2603 if (rt
->rt6i_flags
& (RTF_DEFAULT
| RTF_ROUTEINFO
))
2604 rtm
->rtm_protocol
= RTPROT_RA
;
2606 rtm
->rtm_protocol
= RTPROT_KERNEL
;
2609 if (rt
->rt6i_flags
& RTF_CACHE
)
2610 rtm
->rtm_flags
|= RTM_F_CLONED
;
2613 if (nla_put(skb
, RTA_DST
, 16, dst
))
2614 goto nla_put_failure
;
2615 rtm
->rtm_dst_len
= 128;
2616 } else if (rtm
->rtm_dst_len
)
2617 if (nla_put(skb
, RTA_DST
, 16, &rt
->rt6i_dst
.addr
))
2618 goto nla_put_failure
;
2619 #ifdef CONFIG_IPV6_SUBTREES
2621 if (nla_put(skb
, RTA_SRC
, 16, src
))
2622 goto nla_put_failure
;
2623 rtm
->rtm_src_len
= 128;
2624 } else if (rtm
->rtm_src_len
&&
2625 nla_put(skb
, RTA_SRC
, 16, &rt
->rt6i_src
.addr
))
2626 goto nla_put_failure
;
2629 #ifdef CONFIG_IPV6_MROUTE
2630 if (ipv6_addr_is_multicast(&rt
->rt6i_dst
.addr
)) {
2631 int err
= ip6mr_get_route(net
, skb
, rtm
, nowait
);
2636 goto nla_put_failure
;
2638 if (err
== -EMSGSIZE
)
2639 goto nla_put_failure
;
2644 if (nla_put_u32(skb
, RTA_IIF
, iif
))
2645 goto nla_put_failure
;
2647 struct in6_addr saddr_buf
;
2648 if (ip6_route_get_saddr(net
, rt
, dst
, 0, &saddr_buf
) == 0 &&
2649 nla_put(skb
, RTA_PREFSRC
, 16, &saddr_buf
))
2650 goto nla_put_failure
;
2653 if (rt
->rt6i_prefsrc
.plen
) {
2654 struct in6_addr saddr_buf
;
2655 saddr_buf
= rt
->rt6i_prefsrc
.addr
;
2656 if (nla_put(skb
, RTA_PREFSRC
, 16, &saddr_buf
))
2657 goto nla_put_failure
;
2660 if (rtnetlink_put_metrics(skb
, dst_metrics_ptr(&rt
->dst
)) < 0)
2661 goto nla_put_failure
;
2663 if (rt
->rt6i_flags
& RTF_GATEWAY
) {
2664 if (nla_put(skb
, RTA_GATEWAY
, 16, &rt
->rt6i_gateway
) < 0)
2665 goto nla_put_failure
;
2669 nla_put_u32(skb
, RTA_OIF
, rt
->dst
.dev
->ifindex
))
2670 goto nla_put_failure
;
2671 if (nla_put_u32(skb
, RTA_PRIORITY
, rt
->rt6i_metric
))
2672 goto nla_put_failure
;
2674 expires
= (rt
->rt6i_flags
& RTF_EXPIRES
) ? rt
->dst
.expires
- jiffies
: 0;
2676 if (rtnl_put_cacheinfo(skb
, &rt
->dst
, 0, expires
, rt
->dst
.error
) < 0)
2677 goto nla_put_failure
;
2679 return nlmsg_end(skb
, nlh
);
2682 nlmsg_cancel(skb
, nlh
);
2686 int rt6_dump_route(struct rt6_info
*rt
, void *p_arg
)
2688 struct rt6_rtnl_dump_arg
*arg
= (struct rt6_rtnl_dump_arg
*) p_arg
;
2691 if (nlmsg_len(arg
->cb
->nlh
) >= sizeof(struct rtmsg
)) {
2692 struct rtmsg
*rtm
= nlmsg_data(arg
->cb
->nlh
);
2693 prefix
= (rtm
->rtm_flags
& RTM_F_PREFIX
) != 0;
2697 return rt6_fill_node(arg
->net
,
2698 arg
->skb
, rt
, NULL
, NULL
, 0, RTM_NEWROUTE
,
2699 NETLINK_CB(arg
->cb
->skb
).portid
, arg
->cb
->nlh
->nlmsg_seq
,
2700 prefix
, 0, NLM_F_MULTI
);
2703 static int inet6_rtm_getroute(struct sk_buff
*in_skb
, struct nlmsghdr
*nlh
)
2705 struct net
*net
= sock_net(in_skb
->sk
);
2706 struct nlattr
*tb
[RTA_MAX
+1];
2707 struct rt6_info
*rt
;
2708 struct sk_buff
*skb
;
2711 int err
, iif
= 0, oif
= 0;
2713 err
= nlmsg_parse(nlh
, sizeof(*rtm
), tb
, RTA_MAX
, rtm_ipv6_policy
);
2718 memset(&fl6
, 0, sizeof(fl6
));
2721 if (nla_len(tb
[RTA_SRC
]) < sizeof(struct in6_addr
))
2724 fl6
.saddr
= *(struct in6_addr
*)nla_data(tb
[RTA_SRC
]);
2728 if (nla_len(tb
[RTA_DST
]) < sizeof(struct in6_addr
))
2731 fl6
.daddr
= *(struct in6_addr
*)nla_data(tb
[RTA_DST
]);
2735 iif
= nla_get_u32(tb
[RTA_IIF
]);
2738 oif
= nla_get_u32(tb
[RTA_OIF
]);
2741 fl6
.flowi6_mark
= nla_get_u32(tb
[RTA_MARK
]);
2744 struct net_device
*dev
;
2747 dev
= __dev_get_by_index(net
, iif
);
2753 fl6
.flowi6_iif
= iif
;
2755 if (!ipv6_addr_any(&fl6
.saddr
))
2756 flags
|= RT6_LOOKUP_F_HAS_SADDR
;
2758 rt
= (struct rt6_info
*)ip6_route_input_lookup(net
, dev
, &fl6
,
2761 fl6
.flowi6_oif
= oif
;
2763 rt
= (struct rt6_info
*)ip6_route_output(net
, NULL
, &fl6
);
2766 skb
= alloc_skb(NLMSG_GOODSIZE
, GFP_KERNEL
);
2773 /* Reserve room for dummy headers, this skb can pass
2774 through good chunk of routing engine.
2776 skb_reset_mac_header(skb
);
2777 skb_reserve(skb
, MAX_HEADER
+ sizeof(struct ipv6hdr
));
2779 skb_dst_set(skb
, &rt
->dst
);
2781 err
= rt6_fill_node(net
, skb
, rt
, &fl6
.daddr
, &fl6
.saddr
, iif
,
2782 RTM_NEWROUTE
, NETLINK_CB(in_skb
).portid
,
2783 nlh
->nlmsg_seq
, 0, 0, 0);
2789 err
= rtnl_unicast(skb
, net
, NETLINK_CB(in_skb
).portid
);
2794 void inet6_rt_notify(int event
, struct rt6_info
*rt
, struct nl_info
*info
)
2796 struct sk_buff
*skb
;
2797 struct net
*net
= info
->nl_net
;
2802 seq
= info
->nlh
? info
->nlh
->nlmsg_seq
: 0;
2804 skb
= nlmsg_new(rt6_nlmsg_size(), gfp_any());
2808 err
= rt6_fill_node(net
, skb
, rt
, NULL
, NULL
, 0,
2809 event
, info
->portid
, seq
, 0, 0, 0);
2811 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
2812 WARN_ON(err
== -EMSGSIZE
);
2816 rtnl_notify(skb
, net
, info
->portid
, RTNLGRP_IPV6_ROUTE
,
2817 info
->nlh
, gfp_any());
2821 rtnl_set_sk_err(net
, RTNLGRP_IPV6_ROUTE
, err
);
2824 static int ip6_route_dev_notify(struct notifier_block
*this,
2825 unsigned long event
, void *ptr
)
2827 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
2828 struct net
*net
= dev_net(dev
);
2830 if (event
== NETDEV_REGISTER
&& (dev
->flags
& IFF_LOOPBACK
)) {
2831 net
->ipv6
.ip6_null_entry
->dst
.dev
= dev
;
2832 net
->ipv6
.ip6_null_entry
->rt6i_idev
= in6_dev_get(dev
);
2833 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
2834 net
->ipv6
.ip6_prohibit_entry
->dst
.dev
= dev
;
2835 net
->ipv6
.ip6_prohibit_entry
->rt6i_idev
= in6_dev_get(dev
);
2836 net
->ipv6
.ip6_blk_hole_entry
->dst
.dev
= dev
;
2837 net
->ipv6
.ip6_blk_hole_entry
->rt6i_idev
= in6_dev_get(dev
);
2848 #ifdef CONFIG_PROC_FS
2850 static const struct file_operations ipv6_route_proc_fops
= {
2851 .owner
= THIS_MODULE
,
2852 .open
= ipv6_route_open
,
2854 .llseek
= seq_lseek
,
2855 .release
= seq_release_net
,
2858 static int rt6_stats_seq_show(struct seq_file
*seq
, void *v
)
2860 struct net
*net
= (struct net
*)seq
->private;
2861 seq_printf(seq
, "%04x %04x %04x %04x %04x %04x %04x\n",
2862 net
->ipv6
.rt6_stats
->fib_nodes
,
2863 net
->ipv6
.rt6_stats
->fib_route_nodes
,
2864 net
->ipv6
.rt6_stats
->fib_rt_alloc
,
2865 net
->ipv6
.rt6_stats
->fib_rt_entries
,
2866 net
->ipv6
.rt6_stats
->fib_rt_cache
,
2867 dst_entries_get_slow(&net
->ipv6
.ip6_dst_ops
),
2868 net
->ipv6
.rt6_stats
->fib_discarded_routes
);
2873 static int rt6_stats_seq_open(struct inode
*inode
, struct file
*file
)
2875 return single_open_net(inode
, file
, rt6_stats_seq_show
);
2878 static const struct file_operations rt6_stats_seq_fops
= {
2879 .owner
= THIS_MODULE
,
2880 .open
= rt6_stats_seq_open
,
2882 .llseek
= seq_lseek
,
2883 .release
= single_release_net
,
2885 #endif /* CONFIG_PROC_FS */
2887 #ifdef CONFIG_SYSCTL
2890 int ipv6_sysctl_rtcache_flush(struct ctl_table
*ctl
, int write
,
2891 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2898 net
= (struct net
*)ctl
->extra1
;
2899 delay
= net
->ipv6
.sysctl
.flush_delay
;
2900 proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
2901 fib6_run_gc(delay
<= 0 ? 0 : (unsigned long)delay
, net
, delay
> 0);
2905 struct ctl_table ipv6_route_table_template
[] = {
2907 .procname
= "flush",
2908 .data
= &init_net
.ipv6
.sysctl
.flush_delay
,
2909 .maxlen
= sizeof(int),
2911 .proc_handler
= ipv6_sysctl_rtcache_flush
2914 .procname
= "gc_thresh",
2915 .data
= &ip6_dst_ops_template
.gc_thresh
,
2916 .maxlen
= sizeof(int),
2918 .proc_handler
= proc_dointvec
,
2921 .procname
= "max_size",
2922 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_max_size
,
2923 .maxlen
= sizeof(int),
2925 .proc_handler
= proc_dointvec
,
2928 .procname
= "gc_min_interval",
2929 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_min_interval
,
2930 .maxlen
= sizeof(int),
2932 .proc_handler
= proc_dointvec_jiffies
,
2935 .procname
= "gc_timeout",
2936 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_timeout
,
2937 .maxlen
= sizeof(int),
2939 .proc_handler
= proc_dointvec_jiffies
,
2942 .procname
= "gc_interval",
2943 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_interval
,
2944 .maxlen
= sizeof(int),
2946 .proc_handler
= proc_dointvec_jiffies
,
2949 .procname
= "gc_elasticity",
2950 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_elasticity
,
2951 .maxlen
= sizeof(int),
2953 .proc_handler
= proc_dointvec
,
2956 .procname
= "mtu_expires",
2957 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_mtu_expires
,
2958 .maxlen
= sizeof(int),
2960 .proc_handler
= proc_dointvec_jiffies
,
2963 .procname
= "min_adv_mss",
2964 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_min_advmss
,
2965 .maxlen
= sizeof(int),
2967 .proc_handler
= proc_dointvec
,
2970 .procname
= "gc_min_interval_ms",
2971 .data
= &init_net
.ipv6
.sysctl
.ip6_rt_gc_min_interval
,
2972 .maxlen
= sizeof(int),
2974 .proc_handler
= proc_dointvec_ms_jiffies
,
2979 struct ctl_table
* __net_init
ipv6_route_sysctl_init(struct net
*net
)
2981 struct ctl_table
*table
;
2983 table
= kmemdup(ipv6_route_table_template
,
2984 sizeof(ipv6_route_table_template
),
2988 table
[0].data
= &net
->ipv6
.sysctl
.flush_delay
;
2989 table
[0].extra1
= net
;
2990 table
[1].data
= &net
->ipv6
.ip6_dst_ops
.gc_thresh
;
2991 table
[2].data
= &net
->ipv6
.sysctl
.ip6_rt_max_size
;
2992 table
[3].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
2993 table
[4].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_timeout
;
2994 table
[5].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_interval
;
2995 table
[6].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
;
2996 table
[7].data
= &net
->ipv6
.sysctl
.ip6_rt_mtu_expires
;
2997 table
[8].data
= &net
->ipv6
.sysctl
.ip6_rt_min_advmss
;
2998 table
[9].data
= &net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
;
3000 /* Don't export sysctls to unprivileged users */
3001 if (net
->user_ns
!= &init_user_ns
)
3002 table
[0].procname
= NULL
;
3009 static int __net_init
ip6_route_net_init(struct net
*net
)
3013 memcpy(&net
->ipv6
.ip6_dst_ops
, &ip6_dst_ops_template
,
3014 sizeof(net
->ipv6
.ip6_dst_ops
));
3016 if (dst_entries_init(&net
->ipv6
.ip6_dst_ops
) < 0)
3017 goto out_ip6_dst_ops
;
3019 net
->ipv6
.ip6_null_entry
= kmemdup(&ip6_null_entry_template
,
3020 sizeof(*net
->ipv6
.ip6_null_entry
),
3022 if (!net
->ipv6
.ip6_null_entry
)
3023 goto out_ip6_dst_entries
;
3024 net
->ipv6
.ip6_null_entry
->dst
.path
=
3025 (struct dst_entry
*)net
->ipv6
.ip6_null_entry
;
3026 net
->ipv6
.ip6_null_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
3027 dst_init_metrics(&net
->ipv6
.ip6_null_entry
->dst
,
3028 ip6_template_metrics
, true);
3030 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3031 net
->ipv6
.ip6_prohibit_entry
= kmemdup(&ip6_prohibit_entry_template
,
3032 sizeof(*net
->ipv6
.ip6_prohibit_entry
),
3034 if (!net
->ipv6
.ip6_prohibit_entry
)
3035 goto out_ip6_null_entry
;
3036 net
->ipv6
.ip6_prohibit_entry
->dst
.path
=
3037 (struct dst_entry
*)net
->ipv6
.ip6_prohibit_entry
;
3038 net
->ipv6
.ip6_prohibit_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
3039 dst_init_metrics(&net
->ipv6
.ip6_prohibit_entry
->dst
,
3040 ip6_template_metrics
, true);
3042 net
->ipv6
.ip6_blk_hole_entry
= kmemdup(&ip6_blk_hole_entry_template
,
3043 sizeof(*net
->ipv6
.ip6_blk_hole_entry
),
3045 if (!net
->ipv6
.ip6_blk_hole_entry
)
3046 goto out_ip6_prohibit_entry
;
3047 net
->ipv6
.ip6_blk_hole_entry
->dst
.path
=
3048 (struct dst_entry
*)net
->ipv6
.ip6_blk_hole_entry
;
3049 net
->ipv6
.ip6_blk_hole_entry
->dst
.ops
= &net
->ipv6
.ip6_dst_ops
;
3050 dst_init_metrics(&net
->ipv6
.ip6_blk_hole_entry
->dst
,
3051 ip6_template_metrics
, true);
3054 net
->ipv6
.sysctl
.flush_delay
= 0;
3055 net
->ipv6
.sysctl
.ip6_rt_max_size
= 4096;
3056 net
->ipv6
.sysctl
.ip6_rt_gc_min_interval
= HZ
/ 2;
3057 net
->ipv6
.sysctl
.ip6_rt_gc_timeout
= 60*HZ
;
3058 net
->ipv6
.sysctl
.ip6_rt_gc_interval
= 30*HZ
;
3059 net
->ipv6
.sysctl
.ip6_rt_gc_elasticity
= 9;
3060 net
->ipv6
.sysctl
.ip6_rt_mtu_expires
= 10*60*HZ
;
3061 net
->ipv6
.sysctl
.ip6_rt_min_advmss
= IPV6_MIN_MTU
- 20 - 40;
3063 net
->ipv6
.ip6_rt_gc_expire
= 30*HZ
;
3069 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3070 out_ip6_prohibit_entry
:
3071 kfree(net
->ipv6
.ip6_prohibit_entry
);
3073 kfree(net
->ipv6
.ip6_null_entry
);
3075 out_ip6_dst_entries
:
3076 dst_entries_destroy(&net
->ipv6
.ip6_dst_ops
);
3081 static void __net_exit
ip6_route_net_exit(struct net
*net
)
3083 kfree(net
->ipv6
.ip6_null_entry
);
3084 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3085 kfree(net
->ipv6
.ip6_prohibit_entry
);
3086 kfree(net
->ipv6
.ip6_blk_hole_entry
);
3088 dst_entries_destroy(&net
->ipv6
.ip6_dst_ops
);
3091 static int __net_init
ip6_route_net_init_late(struct net
*net
)
3093 #ifdef CONFIG_PROC_FS
3094 proc_create("ipv6_route", 0, net
->proc_net
, &ipv6_route_proc_fops
);
3095 proc_create("rt6_stats", S_IRUGO
, net
->proc_net
, &rt6_stats_seq_fops
);
3100 static void __net_exit
ip6_route_net_exit_late(struct net
*net
)
3102 #ifdef CONFIG_PROC_FS
3103 remove_proc_entry("ipv6_route", net
->proc_net
);
3104 remove_proc_entry("rt6_stats", net
->proc_net
);
3108 static struct pernet_operations ip6_route_net_ops
= {
3109 .init
= ip6_route_net_init
,
3110 .exit
= ip6_route_net_exit
,
3113 static int __net_init
ipv6_inetpeer_init(struct net
*net
)
3115 struct inet_peer_base
*bp
= kmalloc(sizeof(*bp
), GFP_KERNEL
);
3119 inet_peer_base_init(bp
);
3120 net
->ipv6
.peers
= bp
;
3124 static void __net_exit
ipv6_inetpeer_exit(struct net
*net
)
3126 struct inet_peer_base
*bp
= net
->ipv6
.peers
;
3128 net
->ipv6
.peers
= NULL
;
3129 inetpeer_invalidate_tree(bp
);
3133 static struct pernet_operations ipv6_inetpeer_ops
= {
3134 .init
= ipv6_inetpeer_init
,
3135 .exit
= ipv6_inetpeer_exit
,
3138 static struct pernet_operations ip6_route_net_late_ops
= {
3139 .init
= ip6_route_net_init_late
,
3140 .exit
= ip6_route_net_exit_late
,
3143 static struct notifier_block ip6_route_dev_notifier
= {
3144 .notifier_call
= ip6_route_dev_notify
,
3148 int __init
ip6_route_init(void)
3153 ip6_dst_ops_template
.kmem_cachep
=
3154 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info
), 0,
3155 SLAB_HWCACHE_ALIGN
, NULL
);
3156 if (!ip6_dst_ops_template
.kmem_cachep
)
3159 ret
= dst_entries_init(&ip6_dst_blackhole_ops
);
3161 goto out_kmem_cache
;
3163 ret
= register_pernet_subsys(&ipv6_inetpeer_ops
);
3165 goto out_dst_entries
;
3167 ret
= register_pernet_subsys(&ip6_route_net_ops
);
3169 goto out_register_inetpeer
;
3171 ip6_dst_blackhole_ops
.kmem_cachep
= ip6_dst_ops_template
.kmem_cachep
;
3173 /* Registering of the loopback is done before this portion of code,
3174 * the loopback reference in rt6_info will not be taken, do it
3175 * manually for init_net */
3176 init_net
.ipv6
.ip6_null_entry
->dst
.dev
= init_net
.loopback_dev
;
3177 init_net
.ipv6
.ip6_null_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3178 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
3179 init_net
.ipv6
.ip6_prohibit_entry
->dst
.dev
= init_net
.loopback_dev
;
3180 init_net
.ipv6
.ip6_prohibit_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3181 init_net
.ipv6
.ip6_blk_hole_entry
->dst
.dev
= init_net
.loopback_dev
;
3182 init_net
.ipv6
.ip6_blk_hole_entry
->rt6i_idev
= in6_dev_get(init_net
.loopback_dev
);
3186 goto out_register_subsys
;
3192 ret
= fib6_rules_init();
3196 ret
= register_pernet_subsys(&ip6_route_net_late_ops
);
3198 goto fib6_rules_init
;
3201 if (__rtnl_register(PF_INET6
, RTM_NEWROUTE
, inet6_rtm_newroute
, NULL
, NULL
) ||
3202 __rtnl_register(PF_INET6
, RTM_DELROUTE
, inet6_rtm_delroute
, NULL
, NULL
) ||
3203 __rtnl_register(PF_INET6
, RTM_GETROUTE
, inet6_rtm_getroute
, NULL
, NULL
))
3204 goto out_register_late_subsys
;
3206 ret
= register_netdevice_notifier(&ip6_route_dev_notifier
);
3208 goto out_register_late_subsys
;
3213 out_register_late_subsys
:
3214 unregister_pernet_subsys(&ip6_route_net_late_ops
);
3216 fib6_rules_cleanup();
3221 out_register_subsys
:
3222 unregister_pernet_subsys(&ip6_route_net_ops
);
3223 out_register_inetpeer
:
3224 unregister_pernet_subsys(&ipv6_inetpeer_ops
);
3226 dst_entries_destroy(&ip6_dst_blackhole_ops
);
3228 kmem_cache_destroy(ip6_dst_ops_template
.kmem_cachep
);
3232 void ip6_route_cleanup(void)
3234 unregister_netdevice_notifier(&ip6_route_dev_notifier
);
3235 unregister_pernet_subsys(&ip6_route_net_late_ops
);
3236 fib6_rules_cleanup();
3239 unregister_pernet_subsys(&ipv6_inetpeer_ops
);
3240 unregister_pernet_subsys(&ip6_route_net_ops
);
3241 dst_entries_destroy(&ip6_dst_blackhole_ops
);
3242 kmem_cache_destroy(ip6_dst_ops_template
.kmem_cachep
);