2 * Neighbour Discovery for IPv6
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Mike Shaver <shaver@ingenia.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Pierre Ynard : export userland ND options
19 * through netlink (RDNSS support)
20 * Lars Fenneberg : fixed MTU setting on receipt
22 * Janos Farkas : kmalloc failure checks
23 * Alexey Kuznetsov : state machine reworked
24 * and moved to net/core.
25 * Pekka Savola : RFC2461 validation
26 * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
29 /* Set to 3 to get tracing... */
32 #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0)
33 #define ND_NOPRINTK(x...) do { ; } while(0)
34 #define ND_PRINTK0 ND_PRINTK
35 #define ND_PRINTK1 ND_NOPRINTK
36 #define ND_PRINTK2 ND_NOPRINTK
37 #define ND_PRINTK3 ND_NOPRINTK
40 #define ND_PRINTK1 ND_PRINTK
44 #define ND_PRINTK2 ND_PRINTK
48 #define ND_PRINTK3 ND_PRINTK
51 #include <linux/module.h>
52 #include <linux/errno.h>
53 #include <linux/types.h>
54 #include <linux/socket.h>
55 #include <linux/sockios.h>
56 #include <linux/sched.h>
57 #include <linux/net.h>
58 #include <linux/in6.h>
59 #include <linux/route.h>
60 #include <linux/init.h>
61 #include <linux/rcupdate.h>
62 #include <linux/slab.h>
64 #include <linux/sysctl.h>
67 #include <linux/if_addr.h>
68 #include <linux/if_arp.h>
69 #include <linux/ipv6.h>
70 #include <linux/icmpv6.h>
71 #include <linux/jhash.h>
77 #include <net/protocol.h>
78 #include <net/ndisc.h>
79 #include <net/ip6_route.h>
80 #include <net/addrconf.h>
83 #include <net/netlink.h>
84 #include <linux/rtnetlink.h>
87 #include <net/ip6_checksum.h>
88 #include <net/inet_common.h>
89 #include <linux/proc_fs.h>
91 #include <linux/netfilter.h>
92 #include <linux/netfilter_ipv6.h>
94 static u32
ndisc_hash(const void *pkey
,
95 const struct net_device
*dev
,
97 static int ndisc_constructor(struct neighbour
*neigh
);
98 static void ndisc_solicit(struct neighbour
*neigh
, struct sk_buff
*skb
);
99 static void ndisc_error_report(struct neighbour
*neigh
, struct sk_buff
*skb
);
100 static int pndisc_constructor(struct pneigh_entry
*n
);
101 static void pndisc_destructor(struct pneigh_entry
*n
);
102 static void pndisc_redo(struct sk_buff
*skb
);
104 static const struct neigh_ops ndisc_generic_ops
= {
106 .solicit
= ndisc_solicit
,
107 .error_report
= ndisc_error_report
,
108 .output
= neigh_resolve_output
,
109 .connected_output
= neigh_connected_output
,
112 static const struct neigh_ops ndisc_hh_ops
= {
114 .solicit
= ndisc_solicit
,
115 .error_report
= ndisc_error_report
,
116 .output
= neigh_resolve_output
,
117 .connected_output
= neigh_resolve_output
,
121 static const struct neigh_ops ndisc_direct_ops
= {
123 .output
= neigh_direct_output
,
124 .connected_output
= neigh_direct_output
,
127 struct neigh_table nd_tbl
= {
129 .key_len
= sizeof(struct in6_addr
),
131 .constructor
= ndisc_constructor
,
132 .pconstructor
= pndisc_constructor
,
133 .pdestructor
= pndisc_destructor
,
134 .proxy_redo
= pndisc_redo
,
138 .base_reachable_time
= ND_REACHABLE_TIME
,
139 .retrans_time
= ND_RETRANS_TIMER
,
140 .gc_staletime
= 60 * HZ
,
141 .reachable_time
= ND_REACHABLE_TIME
,
142 .delay_probe_time
= 5 * HZ
,
143 .queue_len_bytes
= 64*1024,
146 .anycast_delay
= 1 * HZ
,
147 .proxy_delay
= (8 * HZ
) / 10,
150 .gc_interval
= 30 * HZ
,
157 struct ndisc_options
{
158 struct nd_opt_hdr
*nd_opt_array
[__ND_OPT_ARRAY_MAX
];
159 #ifdef CONFIG_IPV6_ROUTE_INFO
160 struct nd_opt_hdr
*nd_opts_ri
;
161 struct nd_opt_hdr
*nd_opts_ri_end
;
163 struct nd_opt_hdr
*nd_useropts
;
164 struct nd_opt_hdr
*nd_useropts_end
;
167 #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
168 #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
169 #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
170 #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
171 #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
172 #define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
174 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
177 * Return the padding between the option length and the start of the
178 * link addr. Currently only IP-over-InfiniBand needs this, although
179 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
180 * also need a pad of 2.
182 static int ndisc_addr_option_pad(unsigned short type
)
185 case ARPHRD_INFINIBAND
: return 2;
190 static inline int ndisc_opt_addr_space(struct net_device
*dev
)
192 return NDISC_OPT_SPACE(dev
->addr_len
+ ndisc_addr_option_pad(dev
->type
));
195 static u8
*ndisc_fill_addr_option(u8
*opt
, int type
, void *data
, int data_len
,
196 unsigned short addr_type
)
198 int space
= NDISC_OPT_SPACE(data_len
);
199 int pad
= ndisc_addr_option_pad(addr_type
);
204 memset(opt
+ 2, 0, pad
);
208 memcpy(opt
+2, data
, data_len
);
211 if ((space
-= data_len
) > 0)
212 memset(opt
, 0, space
);
216 static struct nd_opt_hdr
*ndisc_next_option(struct nd_opt_hdr
*cur
,
217 struct nd_opt_hdr
*end
)
220 if (!cur
|| !end
|| cur
>= end
)
222 type
= cur
->nd_opt_type
;
224 cur
= ((void *)cur
) + (cur
->nd_opt_len
<< 3);
225 } while(cur
< end
&& cur
->nd_opt_type
!= type
);
226 return cur
<= end
&& cur
->nd_opt_type
== type
? cur
: NULL
;
229 static inline int ndisc_is_useropt(struct nd_opt_hdr
*opt
)
231 return opt
->nd_opt_type
== ND_OPT_RDNSS
;
234 static struct nd_opt_hdr
*ndisc_next_useropt(struct nd_opt_hdr
*cur
,
235 struct nd_opt_hdr
*end
)
237 if (!cur
|| !end
|| cur
>= end
)
240 cur
= ((void *)cur
) + (cur
->nd_opt_len
<< 3);
241 } while(cur
< end
&& !ndisc_is_useropt(cur
));
242 return cur
<= end
&& ndisc_is_useropt(cur
) ? cur
: NULL
;
245 static struct ndisc_options
*ndisc_parse_options(u8
*opt
, int opt_len
,
246 struct ndisc_options
*ndopts
)
248 struct nd_opt_hdr
*nd_opt
= (struct nd_opt_hdr
*)opt
;
250 if (!nd_opt
|| opt_len
< 0 || !ndopts
)
252 memset(ndopts
, 0, sizeof(*ndopts
));
255 if (opt_len
< sizeof(struct nd_opt_hdr
))
257 l
= nd_opt
->nd_opt_len
<< 3;
258 if (opt_len
< l
|| l
== 0)
260 switch (nd_opt
->nd_opt_type
) {
261 case ND_OPT_SOURCE_LL_ADDR
:
262 case ND_OPT_TARGET_LL_ADDR
:
264 case ND_OPT_REDIRECT_HDR
:
265 if (ndopts
->nd_opt_array
[nd_opt
->nd_opt_type
]) {
266 ND_PRINTK2(KERN_WARNING
267 "%s(): duplicated ND6 option found: type=%d\n",
269 nd_opt
->nd_opt_type
);
271 ndopts
->nd_opt_array
[nd_opt
->nd_opt_type
] = nd_opt
;
274 case ND_OPT_PREFIX_INFO
:
275 ndopts
->nd_opts_pi_end
= nd_opt
;
276 if (!ndopts
->nd_opt_array
[nd_opt
->nd_opt_type
])
277 ndopts
->nd_opt_array
[nd_opt
->nd_opt_type
] = nd_opt
;
279 #ifdef CONFIG_IPV6_ROUTE_INFO
280 case ND_OPT_ROUTE_INFO
:
281 ndopts
->nd_opts_ri_end
= nd_opt
;
282 if (!ndopts
->nd_opts_ri
)
283 ndopts
->nd_opts_ri
= nd_opt
;
287 if (ndisc_is_useropt(nd_opt
)) {
288 ndopts
->nd_useropts_end
= nd_opt
;
289 if (!ndopts
->nd_useropts
)
290 ndopts
->nd_useropts
= nd_opt
;
293 * Unknown options must be silently ignored,
294 * to accommodate future extension to the
297 ND_PRINTK2(KERN_NOTICE
298 "%s(): ignored unsupported option; type=%d, len=%d\n",
300 nd_opt
->nd_opt_type
, nd_opt
->nd_opt_len
);
304 nd_opt
= ((void *)nd_opt
) + l
;
309 static inline u8
*ndisc_opt_addr_data(struct nd_opt_hdr
*p
,
310 struct net_device
*dev
)
312 u8
*lladdr
= (u8
*)(p
+ 1);
313 int lladdrlen
= p
->nd_opt_len
<< 3;
314 int prepad
= ndisc_addr_option_pad(dev
->type
);
315 if (lladdrlen
!= NDISC_OPT_SPACE(dev
->addr_len
+ prepad
))
317 return lladdr
+ prepad
;
320 int ndisc_mc_map(const struct in6_addr
*addr
, char *buf
, struct net_device
*dev
, int dir
)
324 case ARPHRD_IEEE802
: /* Not sure. Check it later. --ANK */
326 ipv6_eth_mc_map(addr
, buf
);
328 case ARPHRD_IEEE802_TR
:
329 ipv6_tr_mc_map(addr
,buf
);
332 ipv6_arcnet_mc_map(addr
, buf
);
334 case ARPHRD_INFINIBAND
:
335 ipv6_ib_mc_map(addr
, dev
->broadcast
, buf
);
338 return ipv6_ipgre_mc_map(addr
, dev
->broadcast
, buf
);
341 memcpy(buf
, dev
->broadcast
, dev
->addr_len
);
348 EXPORT_SYMBOL(ndisc_mc_map
);
350 static u32
ndisc_hash(const void *pkey
,
351 const struct net_device
*dev
,
354 return ndisc_hashfn(pkey
, dev
, hash_rnd
);
357 static int ndisc_constructor(struct neighbour
*neigh
)
359 struct in6_addr
*addr
= (struct in6_addr
*)&neigh
->primary_key
;
360 struct net_device
*dev
= neigh
->dev
;
361 struct inet6_dev
*in6_dev
;
362 struct neigh_parms
*parms
;
363 int is_multicast
= ipv6_addr_is_multicast(addr
);
365 in6_dev
= in6_dev_get(dev
);
366 if (in6_dev
== NULL
) {
370 parms
= in6_dev
->nd_parms
;
371 __neigh_parms_put(neigh
->parms
);
372 neigh
->parms
= neigh_parms_clone(parms
);
374 neigh
->type
= is_multicast
? RTN_MULTICAST
: RTN_UNICAST
;
375 if (!dev
->header_ops
) {
376 neigh
->nud_state
= NUD_NOARP
;
377 neigh
->ops
= &ndisc_direct_ops
;
378 neigh
->output
= neigh_direct_output
;
381 neigh
->nud_state
= NUD_NOARP
;
382 ndisc_mc_map(addr
, neigh
->ha
, dev
, 1);
383 } else if (dev
->flags
&(IFF_NOARP
|IFF_LOOPBACK
)) {
384 neigh
->nud_state
= NUD_NOARP
;
385 memcpy(neigh
->ha
, dev
->dev_addr
, dev
->addr_len
);
386 if (dev
->flags
&IFF_LOOPBACK
)
387 neigh
->type
= RTN_LOCAL
;
388 } else if (dev
->flags
&IFF_POINTOPOINT
) {
389 neigh
->nud_state
= NUD_NOARP
;
390 memcpy(neigh
->ha
, dev
->broadcast
, dev
->addr_len
);
392 if (dev
->header_ops
->cache
)
393 neigh
->ops
= &ndisc_hh_ops
;
395 neigh
->ops
= &ndisc_generic_ops
;
396 if (neigh
->nud_state
&NUD_VALID
)
397 neigh
->output
= neigh
->ops
->connected_output
;
399 neigh
->output
= neigh
->ops
->output
;
401 in6_dev_put(in6_dev
);
405 static int pndisc_constructor(struct pneigh_entry
*n
)
407 struct in6_addr
*addr
= (struct in6_addr
*)&n
->key
;
408 struct in6_addr maddr
;
409 struct net_device
*dev
= n
->dev
;
411 if (dev
== NULL
|| __in6_dev_get(dev
) == NULL
)
413 addrconf_addr_solict_mult(addr
, &maddr
);
414 ipv6_dev_mc_inc(dev
, &maddr
);
418 static void pndisc_destructor(struct pneigh_entry
*n
)
420 struct in6_addr
*addr
= (struct in6_addr
*)&n
->key
;
421 struct in6_addr maddr
;
422 struct net_device
*dev
= n
->dev
;
424 if (dev
== NULL
|| __in6_dev_get(dev
) == NULL
)
426 addrconf_addr_solict_mult(addr
, &maddr
);
427 ipv6_dev_mc_dec(dev
, &maddr
);
430 struct sk_buff
*ndisc_build_skb(struct net_device
*dev
,
431 const struct in6_addr
*daddr
,
432 const struct in6_addr
*saddr
,
433 struct icmp6hdr
*icmp6h
,
434 const struct in6_addr
*target
,
437 struct net
*net
= dev_net(dev
);
438 struct sock
*sk
= net
->ipv6
.ndisc_sk
;
440 struct icmp6hdr
*hdr
;
441 int hlen
= LL_RESERVED_SPACE(dev
);
442 int tlen
= dev
->needed_tailroom
;
450 len
= sizeof(struct icmp6hdr
) + (target
? sizeof(*target
) : 0);
452 len
+= ndisc_opt_addr_space(dev
);
454 skb
= sock_alloc_send_skb(sk
,
455 (MAX_HEADER
+ sizeof(struct ipv6hdr
) +
460 "ICMPv6 ND: %s() failed to allocate an skb, err=%d.\n",
465 skb_reserve(skb
, hlen
);
466 ip6_nd_hdr(sk
, skb
, dev
, saddr
, daddr
, IPPROTO_ICMPV6
, len
);
468 skb
->transport_header
= skb
->tail
;
471 hdr
= (struct icmp6hdr
*)skb_transport_header(skb
);
472 memcpy(hdr
, icmp6h
, sizeof(*hdr
));
474 opt
= skb_transport_header(skb
) + sizeof(struct icmp6hdr
);
476 *(struct in6_addr
*)opt
= *target
;
477 opt
+= sizeof(*target
);
481 ndisc_fill_addr_option(opt
, llinfo
, dev
->dev_addr
,
482 dev
->addr_len
, dev
->type
);
484 hdr
->icmp6_cksum
= csum_ipv6_magic(saddr
, daddr
, len
,
492 EXPORT_SYMBOL(ndisc_build_skb
);
494 void ndisc_send_skb(struct sk_buff
*skb
,
495 struct net_device
*dev
,
496 struct neighbour
*neigh
,
497 const struct in6_addr
*daddr
,
498 const struct in6_addr
*saddr
,
499 struct icmp6hdr
*icmp6h
)
502 struct dst_entry
*dst
;
503 struct net
*net
= dev_net(dev
);
504 struct sock
*sk
= net
->ipv6
.ndisc_sk
;
505 struct inet6_dev
*idev
;
509 type
= icmp6h
->icmp6_type
;
511 icmpv6_flow_init(sk
, &fl6
, type
, saddr
, daddr
, dev
->ifindex
);
512 dst
= icmp6_dst_alloc(dev
, neigh
, &fl6
);
518 skb_dst_set(skb
, dst
);
521 idev
= __in6_dev_get(dst
->dev
);
522 IP6_UPD_PO_STATS(net
, idev
, IPSTATS_MIB_OUT
, skb
->len
);
524 err
= NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, skb
, NULL
, dst
->dev
,
527 ICMP6MSGOUT_INC_STATS(net
, idev
, type
);
528 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTMSGS
);
534 EXPORT_SYMBOL(ndisc_send_skb
);
537 * Send a Neighbour Discover packet
539 static void __ndisc_send(struct net_device
*dev
,
540 struct neighbour
*neigh
,
541 const struct in6_addr
*daddr
,
542 const struct in6_addr
*saddr
,
543 struct icmp6hdr
*icmp6h
, const struct in6_addr
*target
,
548 skb
= ndisc_build_skb(dev
, daddr
, saddr
, icmp6h
, target
, llinfo
);
552 ndisc_send_skb(skb
, dev
, neigh
, daddr
, saddr
, icmp6h
);
555 static void ndisc_send_na(struct net_device
*dev
, struct neighbour
*neigh
,
556 const struct in6_addr
*daddr
,
557 const struct in6_addr
*solicited_addr
,
558 int router
, int solicited
, int override
, int inc_opt
)
560 struct in6_addr tmpaddr
;
561 struct inet6_ifaddr
*ifp
;
562 const struct in6_addr
*src_addr
;
563 struct icmp6hdr icmp6h
= {
564 .icmp6_type
= NDISC_NEIGHBOUR_ADVERTISEMENT
,
567 /* for anycast or proxy, solicited_addr != src_addr */
568 ifp
= ipv6_get_ifaddr(dev_net(dev
), solicited_addr
, dev
, 1);
570 src_addr
= solicited_addr
;
571 if (ifp
->flags
& IFA_F_OPTIMISTIC
)
573 inc_opt
|= ifp
->idev
->cnf
.force_tllao
;
576 if (ipv6_dev_get_saddr(dev_net(dev
), dev
, daddr
,
577 inet6_sk(dev_net(dev
)->ipv6
.ndisc_sk
)->srcprefs
,
583 icmp6h
.icmp6_router
= router
;
584 icmp6h
.icmp6_solicited
= solicited
;
585 icmp6h
.icmp6_override
= override
;
587 __ndisc_send(dev
, neigh
, daddr
, src_addr
,
588 &icmp6h
, solicited_addr
,
589 inc_opt
? ND_OPT_TARGET_LL_ADDR
: 0);
592 static void ndisc_send_unsol_na(struct net_device
*dev
)
594 struct inet6_dev
*idev
;
595 struct inet6_ifaddr
*ifa
;
596 struct in6_addr mcaddr
;
598 idev
= in6_dev_get(dev
);
602 read_lock_bh(&idev
->lock
);
603 list_for_each_entry(ifa
, &idev
->addr_list
, if_list
) {
604 addrconf_addr_solict_mult(&ifa
->addr
, &mcaddr
);
605 ndisc_send_na(dev
, NULL
, &mcaddr
, &ifa
->addr
,
606 /*router=*/ !!idev
->cnf
.forwarding
,
607 /*solicited=*/ false, /*override=*/ true,
610 read_unlock_bh(&idev
->lock
);
615 void ndisc_send_ns(struct net_device
*dev
, struct neighbour
*neigh
,
616 const struct in6_addr
*solicit
,
617 const struct in6_addr
*daddr
, const struct in6_addr
*saddr
)
619 struct in6_addr addr_buf
;
620 struct icmp6hdr icmp6h
= {
621 .icmp6_type
= NDISC_NEIGHBOUR_SOLICITATION
,
625 if (ipv6_get_lladdr(dev
, &addr_buf
,
626 (IFA_F_TENTATIVE
|IFA_F_OPTIMISTIC
)))
631 __ndisc_send(dev
, neigh
, daddr
, saddr
,
633 !ipv6_addr_any(saddr
) ? ND_OPT_SOURCE_LL_ADDR
: 0);
636 void ndisc_send_rs(struct net_device
*dev
, const struct in6_addr
*saddr
,
637 const struct in6_addr
*daddr
)
639 struct icmp6hdr icmp6h
= {
640 .icmp6_type
= NDISC_ROUTER_SOLICITATION
,
642 int send_sllao
= dev
->addr_len
;
644 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
646 * According to section 2.2 of RFC 4429, we must not
647 * send router solicitations with a sllao from
648 * optimistic addresses, but we may send the solicitation
649 * if we don't include the sllao. So here we check
650 * if our address is optimistic, and if so, we
651 * suppress the inclusion of the sllao.
654 struct inet6_ifaddr
*ifp
= ipv6_get_ifaddr(dev_net(dev
), saddr
,
657 if (ifp
->flags
& IFA_F_OPTIMISTIC
) {
666 __ndisc_send(dev
, NULL
, daddr
, saddr
,
668 send_sllao
? ND_OPT_SOURCE_LL_ADDR
: 0);
672 static void ndisc_error_report(struct neighbour
*neigh
, struct sk_buff
*skb
)
675 * "The sender MUST return an ICMP
676 * destination unreachable"
678 dst_link_failure(skb
);
682 /* Called with locked neigh: either read or both */
684 static void ndisc_solicit(struct neighbour
*neigh
, struct sk_buff
*skb
)
686 struct in6_addr
*saddr
= NULL
;
687 struct in6_addr mcaddr
;
688 struct net_device
*dev
= neigh
->dev
;
689 struct in6_addr
*target
= (struct in6_addr
*)&neigh
->primary_key
;
690 int probes
= atomic_read(&neigh
->probes
);
692 if (skb
&& ipv6_chk_addr(dev_net(dev
), &ipv6_hdr(skb
)->saddr
, dev
, 1))
693 saddr
= &ipv6_hdr(skb
)->saddr
;
695 if ((probes
-= neigh
->parms
->ucast_probes
) < 0) {
696 if (!(neigh
->nud_state
& NUD_VALID
)) {
697 ND_PRINTK1(KERN_DEBUG
"%s(): trying to ucast probe in NUD_INVALID: %pI6\n",
700 ndisc_send_ns(dev
, neigh
, target
, target
, saddr
);
701 } else if ((probes
-= neigh
->parms
->app_probes
) < 0) {
706 addrconf_addr_solict_mult(target
, &mcaddr
);
707 ndisc_send_ns(dev
, NULL
, target
, &mcaddr
, saddr
);
711 static int pndisc_is_router(const void *pkey
,
712 struct net_device
*dev
)
714 struct pneigh_entry
*n
;
717 read_lock_bh(&nd_tbl
.lock
);
718 n
= __pneigh_lookup(&nd_tbl
, dev_net(dev
), pkey
, dev
);
720 ret
= !!(n
->flags
& NTF_ROUTER
);
721 read_unlock_bh(&nd_tbl
.lock
);
726 static void ndisc_recv_ns(struct sk_buff
*skb
)
728 struct nd_msg
*msg
= (struct nd_msg
*)skb_transport_header(skb
);
729 const struct in6_addr
*saddr
= &ipv6_hdr(skb
)->saddr
;
730 const struct in6_addr
*daddr
= &ipv6_hdr(skb
)->daddr
;
732 u32 ndoptlen
= skb
->tail
- (skb
->transport_header
+
733 offsetof(struct nd_msg
, opt
));
734 struct ndisc_options ndopts
;
735 struct net_device
*dev
= skb
->dev
;
736 struct inet6_ifaddr
*ifp
;
737 struct inet6_dev
*idev
= NULL
;
738 struct neighbour
*neigh
;
739 int dad
= ipv6_addr_any(saddr
);
743 if (ipv6_addr_is_multicast(&msg
->target
)) {
744 ND_PRINTK2(KERN_WARNING
745 "ICMPv6 NS: multicast target address");
751 * DAD has to be destined for solicited node multicast address.
754 !(daddr
->s6_addr32
[0] == htonl(0xff020000) &&
755 daddr
->s6_addr32
[1] == htonl(0x00000000) &&
756 daddr
->s6_addr32
[2] == htonl(0x00000001) &&
757 daddr
->s6_addr
[12] == 0xff )) {
758 ND_PRINTK2(KERN_WARNING
759 "ICMPv6 NS: bad DAD packet (wrong destination)\n");
763 if (!ndisc_parse_options(msg
->opt
, ndoptlen
, &ndopts
)) {
764 ND_PRINTK2(KERN_WARNING
765 "ICMPv6 NS: invalid ND options\n");
769 if (ndopts
.nd_opts_src_lladdr
) {
770 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_src_lladdr
, dev
);
772 ND_PRINTK2(KERN_WARNING
773 "ICMPv6 NS: invalid link-layer address length\n");
778 * If the IP source address is the unspecified address,
779 * there MUST NOT be source link-layer address option
783 ND_PRINTK2(KERN_WARNING
784 "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
789 inc
= ipv6_addr_is_multicast(daddr
);
791 ifp
= ipv6_get_ifaddr(dev_net(dev
), &msg
->target
, dev
, 1);
794 if (ifp
->flags
& (IFA_F_TENTATIVE
|IFA_F_OPTIMISTIC
)) {
796 if (dev
->type
== ARPHRD_IEEE802_TR
) {
797 const unsigned char *sadr
;
798 sadr
= skb_mac_header(skb
);
799 if (((sadr
[8] ^ dev
->dev_addr
[0]) & 0x7f) == 0 &&
800 sadr
[9] == dev
->dev_addr
[1] &&
801 sadr
[10] == dev
->dev_addr
[2] &&
802 sadr
[11] == dev
->dev_addr
[3] &&
803 sadr
[12] == dev
->dev_addr
[4] &&
804 sadr
[13] == dev
->dev_addr
[5]) {
805 /* looped-back to us */
811 * We are colliding with another node
813 * so fail our DAD process
815 addrconf_dad_failure(ifp
);
819 * This is not a dad solicitation.
820 * If we are an optimistic node,
822 * Otherwise, we should ignore it.
824 if (!(ifp
->flags
& IFA_F_OPTIMISTIC
))
831 struct net
*net
= dev_net(dev
);
833 idev
= in6_dev_get(dev
);
835 /* XXX: count this drop? */
839 if (ipv6_chk_acast_addr(net
, dev
, &msg
->target
) ||
840 (idev
->cnf
.forwarding
&&
841 (net
->ipv6
.devconf_all
->proxy_ndp
|| idev
->cnf
.proxy_ndp
) &&
842 (is_router
= pndisc_is_router(&msg
->target
, dev
)) >= 0)) {
843 if (!(NEIGH_CB(skb
)->flags
& LOCALLY_ENQUEUED
) &&
844 skb
->pkt_type
!= PACKET_HOST
&&
846 idev
->nd_parms
->proxy_delay
!= 0) {
848 * for anycast or proxy,
849 * sender should delay its response
850 * by a random time between 0 and
851 * MAX_ANYCAST_DELAY_TIME seconds.
852 * (RFC2461) -- yoshfuji
854 struct sk_buff
*n
= skb_clone(skb
, GFP_ATOMIC
);
856 pneigh_enqueue(&nd_tbl
, idev
->nd_parms
, n
);
864 is_router
= !!idev
->cnf
.forwarding
;
867 ndisc_send_na(dev
, NULL
, &in6addr_linklocal_allnodes
, &msg
->target
,
868 is_router
, 0, (ifp
!= NULL
), 1);
873 NEIGH_CACHE_STAT_INC(&nd_tbl
, rcv_probes_mcast
);
875 NEIGH_CACHE_STAT_INC(&nd_tbl
, rcv_probes_ucast
);
878 * update / create cache entry
879 * for the source address
881 neigh
= __neigh_lookup(&nd_tbl
, saddr
, dev
,
882 !inc
|| lladdr
|| !dev
->addr_len
);
884 neigh_update(neigh
, lladdr
, NUD_STALE
,
885 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
886 NEIGH_UPDATE_F_OVERRIDE
);
887 if (neigh
|| !dev
->header_ops
) {
888 ndisc_send_na(dev
, neigh
, saddr
, &msg
->target
,
890 1, (ifp
!= NULL
&& inc
), inc
);
892 neigh_release(neigh
);
902 static void ndisc_recv_na(struct sk_buff
*skb
)
904 struct nd_msg
*msg
= (struct nd_msg
*)skb_transport_header(skb
);
905 const struct in6_addr
*saddr
= &ipv6_hdr(skb
)->saddr
;
906 const struct in6_addr
*daddr
= &ipv6_hdr(skb
)->daddr
;
908 u32 ndoptlen
= skb
->tail
- (skb
->transport_header
+
909 offsetof(struct nd_msg
, opt
));
910 struct ndisc_options ndopts
;
911 struct net_device
*dev
= skb
->dev
;
912 struct inet6_ifaddr
*ifp
;
913 struct neighbour
*neigh
;
915 if (skb
->len
< sizeof(struct nd_msg
)) {
916 ND_PRINTK2(KERN_WARNING
917 "ICMPv6 NA: packet too short\n");
921 if (ipv6_addr_is_multicast(&msg
->target
)) {
922 ND_PRINTK2(KERN_WARNING
923 "ICMPv6 NA: target address is multicast.\n");
927 if (ipv6_addr_is_multicast(daddr
) &&
928 msg
->icmph
.icmp6_solicited
) {
929 ND_PRINTK2(KERN_WARNING
930 "ICMPv6 NA: solicited NA is multicasted.\n");
934 if (!ndisc_parse_options(msg
->opt
, ndoptlen
, &ndopts
)) {
935 ND_PRINTK2(KERN_WARNING
936 "ICMPv6 NS: invalid ND option\n");
939 if (ndopts
.nd_opts_tgt_lladdr
) {
940 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_tgt_lladdr
, dev
);
942 ND_PRINTK2(KERN_WARNING
943 "ICMPv6 NA: invalid link-layer address length\n");
947 ifp
= ipv6_get_ifaddr(dev_net(dev
), &msg
->target
, dev
, 1);
949 if (skb
->pkt_type
!= PACKET_LOOPBACK
950 && (ifp
->flags
& IFA_F_TENTATIVE
)) {
951 addrconf_dad_failure(ifp
);
954 /* What should we make now? The advertisement
955 is invalid, but ndisc specs say nothing
956 about it. It could be misconfiguration, or
957 an smart proxy agent tries to help us :-)
959 We should not print the error if NA has been
960 received from loopback - it is just our own
961 unsolicited advertisement.
963 if (skb
->pkt_type
!= PACKET_LOOPBACK
)
964 ND_PRINTK1(KERN_WARNING
965 "ICMPv6 NA: someone advertises our address %pI6 on %s!\n",
966 &ifp
->addr
, ifp
->idev
->dev
->name
);
970 neigh
= neigh_lookup(&nd_tbl
, &msg
->target
, dev
);
973 u8 old_flags
= neigh
->flags
;
974 struct net
*net
= dev_net(dev
);
976 if (neigh
->nud_state
& NUD_FAILED
)
980 * Don't update the neighbor cache entry on a proxy NA from
981 * ourselves because either the proxied node is off link or it
982 * has already sent a NA to us.
984 if (lladdr
&& !memcmp(lladdr
, dev
->dev_addr
, dev
->addr_len
) &&
985 net
->ipv6
.devconf_all
->forwarding
&& net
->ipv6
.devconf_all
->proxy_ndp
&&
986 pneigh_lookup(&nd_tbl
, net
, &msg
->target
, dev
, 0)) {
987 /* XXX: idev->cnf.prixy_ndp */
991 neigh_update(neigh
, lladdr
,
992 msg
->icmph
.icmp6_solicited
? NUD_REACHABLE
: NUD_STALE
,
993 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
994 (msg
->icmph
.icmp6_override
? NEIGH_UPDATE_F_OVERRIDE
: 0)|
995 NEIGH_UPDATE_F_OVERRIDE_ISROUTER
|
996 (msg
->icmph
.icmp6_router
? NEIGH_UPDATE_F_ISROUTER
: 0));
998 if ((old_flags
& ~neigh
->flags
) & NTF_ROUTER
) {
1000 * Change: router to host
1002 struct rt6_info
*rt
;
1003 rt
= rt6_get_dflt_router(saddr
, dev
);
1009 neigh_release(neigh
);
1013 static void ndisc_recv_rs(struct sk_buff
*skb
)
1015 struct rs_msg
*rs_msg
= (struct rs_msg
*)skb_transport_header(skb
);
1016 unsigned long ndoptlen
= skb
->len
- sizeof(*rs_msg
);
1017 struct neighbour
*neigh
;
1018 struct inet6_dev
*idev
;
1019 const struct in6_addr
*saddr
= &ipv6_hdr(skb
)->saddr
;
1020 struct ndisc_options ndopts
;
1023 if (skb
->len
< sizeof(*rs_msg
))
1026 idev
= __in6_dev_get(skb
->dev
);
1028 if (net_ratelimit())
1029 ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
1033 /* Don't accept RS if we're not in router mode */
1034 if (!idev
->cnf
.forwarding
)
1038 * Don't update NCE if src = ::;
1039 * this implies that the source node has no ip address assigned yet.
1041 if (ipv6_addr_any(saddr
))
1044 /* Parse ND options */
1045 if (!ndisc_parse_options(rs_msg
->opt
, ndoptlen
, &ndopts
)) {
1046 if (net_ratelimit())
1047 ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
1051 if (ndopts
.nd_opts_src_lladdr
) {
1052 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_src_lladdr
,
1058 neigh
= __neigh_lookup(&nd_tbl
, saddr
, skb
->dev
, 1);
1060 neigh_update(neigh
, lladdr
, NUD_STALE
,
1061 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
1062 NEIGH_UPDATE_F_OVERRIDE
|
1063 NEIGH_UPDATE_F_OVERRIDE_ISROUTER
);
1064 neigh_release(neigh
);
1070 static void ndisc_ra_useropt(struct sk_buff
*ra
, struct nd_opt_hdr
*opt
)
1072 struct icmp6hdr
*icmp6h
= (struct icmp6hdr
*)skb_transport_header(ra
);
1073 struct sk_buff
*skb
;
1074 struct nlmsghdr
*nlh
;
1075 struct nduseroptmsg
*ndmsg
;
1076 struct net
*net
= dev_net(ra
->dev
);
1078 int base_size
= NLMSG_ALIGN(sizeof(struct nduseroptmsg
)
1079 + (opt
->nd_opt_len
<< 3));
1080 size_t msg_size
= base_size
+ nla_total_size(sizeof(struct in6_addr
));
1082 skb
= nlmsg_new(msg_size
, GFP_ATOMIC
);
1088 nlh
= nlmsg_put(skb
, 0, 0, RTM_NEWNDUSEROPT
, base_size
, 0);
1090 goto nla_put_failure
;
1093 ndmsg
= nlmsg_data(nlh
);
1094 ndmsg
->nduseropt_family
= AF_INET6
;
1095 ndmsg
->nduseropt_ifindex
= ra
->dev
->ifindex
;
1096 ndmsg
->nduseropt_icmp_type
= icmp6h
->icmp6_type
;
1097 ndmsg
->nduseropt_icmp_code
= icmp6h
->icmp6_code
;
1098 ndmsg
->nduseropt_opts_len
= opt
->nd_opt_len
<< 3;
1100 memcpy(ndmsg
+ 1, opt
, opt
->nd_opt_len
<< 3);
1102 NLA_PUT(skb
, NDUSEROPT_SRCADDR
, sizeof(struct in6_addr
),
1103 &ipv6_hdr(ra
)->saddr
);
1104 nlmsg_end(skb
, nlh
);
1106 rtnl_notify(skb
, net
, 0, RTNLGRP_ND_USEROPT
, NULL
, GFP_ATOMIC
);
1113 rtnl_set_sk_err(net
, RTNLGRP_ND_USEROPT
, err
);
1116 static inline int accept_ra(struct inet6_dev
*in6_dev
)
1119 * If forwarding is enabled, RA are not accepted unless the special
1120 * hybrid mode (accept_ra=2) is enabled.
1122 if (in6_dev
->cnf
.forwarding
&& in6_dev
->cnf
.accept_ra
< 2)
1125 return in6_dev
->cnf
.accept_ra
;
1128 static void ndisc_router_discovery(struct sk_buff
*skb
)
1130 struct ra_msg
*ra_msg
= (struct ra_msg
*)skb_transport_header(skb
);
1131 struct neighbour
*neigh
= NULL
;
1132 struct inet6_dev
*in6_dev
;
1133 struct rt6_info
*rt
= NULL
;
1135 struct ndisc_options ndopts
;
1137 unsigned int pref
= 0;
1139 __u8
* opt
= (__u8
*)(ra_msg
+ 1);
1141 optlen
= (skb
->tail
- skb
->transport_header
) - sizeof(struct ra_msg
);
1143 if (!(ipv6_addr_type(&ipv6_hdr(skb
)->saddr
) & IPV6_ADDR_LINKLOCAL
)) {
1144 ND_PRINTK2(KERN_WARNING
1145 "ICMPv6 RA: source address is not link-local.\n");
1149 ND_PRINTK2(KERN_WARNING
1150 "ICMPv6 RA: packet too short\n");
1154 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1155 if (skb
->ndisc_nodetype
== NDISC_NODETYPE_HOST
) {
1156 ND_PRINTK2(KERN_WARNING
1157 "ICMPv6 RA: from host or unauthorized router\n");
1163 * set the RA_RECV flag in the interface
1166 in6_dev
= __in6_dev_get(skb
->dev
);
1167 if (in6_dev
== NULL
) {
1169 "ICMPv6 RA: can't find inet6 device for %s.\n",
1174 if (!ndisc_parse_options(opt
, optlen
, &ndopts
)) {
1175 ND_PRINTK2(KERN_WARNING
1176 "ICMP6 RA: invalid ND options\n");
1180 if (!accept_ra(in6_dev
))
1181 goto skip_linkparms
;
1183 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1184 /* skip link-specific parameters from interior routers */
1185 if (skb
->ndisc_nodetype
== NDISC_NODETYPE_NODEFAULT
)
1186 goto skip_linkparms
;
1189 if (in6_dev
->if_flags
& IF_RS_SENT
) {
1191 * flag that an RA was received after an RS was sent
1192 * out on this interface.
1194 in6_dev
->if_flags
|= IF_RA_RCVD
;
1198 * Remember the managed/otherconf flags from most recently
1199 * received RA message (RFC 2462) -- yoshfuji
1201 in6_dev
->if_flags
= (in6_dev
->if_flags
& ~(IF_RA_MANAGED
|
1203 (ra_msg
->icmph
.icmp6_addrconf_managed
?
1204 IF_RA_MANAGED
: 0) |
1205 (ra_msg
->icmph
.icmp6_addrconf_other
?
1206 IF_RA_OTHERCONF
: 0);
1208 if (!in6_dev
->cnf
.accept_ra_defrtr
)
1211 if (ipv6_chk_addr(dev_net(in6_dev
->dev
), &ipv6_hdr(skb
)->saddr
, NULL
, 0))
1214 lifetime
= ntohs(ra_msg
->icmph
.icmp6_rt_lifetime
);
1216 #ifdef CONFIG_IPV6_ROUTER_PREF
1217 pref
= ra_msg
->icmph
.icmp6_router_pref
;
1218 /* 10b is handled as if it were 00b (medium) */
1219 if (pref
== ICMPV6_ROUTER_PREF_INVALID
||
1220 !in6_dev
->cnf
.accept_ra_rtr_pref
)
1221 pref
= ICMPV6_ROUTER_PREF_MEDIUM
;
1224 rt
= rt6_get_dflt_router(&ipv6_hdr(skb
)->saddr
, skb
->dev
);
1227 neigh
= dst_get_neighbour_noref(&rt
->dst
);
1229 if (rt
&& lifetime
== 0) {
1235 if (rt
== NULL
&& lifetime
) {
1236 ND_PRINTK3(KERN_DEBUG
1237 "ICMPv6 RA: adding default router.\n");
1239 rt
= rt6_add_dflt_router(&ipv6_hdr(skb
)->saddr
, skb
->dev
, pref
);
1242 "ICMPv6 RA: %s() failed to add default route.\n",
1247 neigh
= dst_get_neighbour_noref(&rt
->dst
);
1248 if (neigh
== NULL
) {
1250 "ICMPv6 RA: %s() got default router without neighbour.\n",
1252 dst_release(&rt
->dst
);
1255 neigh
->flags
|= NTF_ROUTER
;
1257 rt
->rt6i_flags
= (rt
->rt6i_flags
& ~RTF_PREF_MASK
) | RTF_PREF(pref
);
1261 rt
->dst
.expires
= jiffies
+ (HZ
* lifetime
);
1263 if (ra_msg
->icmph
.icmp6_hop_limit
) {
1264 in6_dev
->cnf
.hop_limit
= ra_msg
->icmph
.icmp6_hop_limit
;
1266 dst_metric_set(&rt
->dst
, RTAX_HOPLIMIT
,
1267 ra_msg
->icmph
.icmp6_hop_limit
);
1273 * Update Reachable Time and Retrans Timer
1276 if (in6_dev
->nd_parms
) {
1277 unsigned long rtime
= ntohl(ra_msg
->retrans_timer
);
1279 if (rtime
&& rtime
/1000 < MAX_SCHEDULE_TIMEOUT
/HZ
) {
1280 rtime
= (rtime
*HZ
)/1000;
1283 in6_dev
->nd_parms
->retrans_time
= rtime
;
1284 in6_dev
->tstamp
= jiffies
;
1285 inet6_ifinfo_notify(RTM_NEWLINK
, in6_dev
);
1288 rtime
= ntohl(ra_msg
->reachable_time
);
1289 if (rtime
&& rtime
/1000 < MAX_SCHEDULE_TIMEOUT
/(3*HZ
)) {
1290 rtime
= (rtime
*HZ
)/1000;
1295 if (rtime
!= in6_dev
->nd_parms
->base_reachable_time
) {
1296 in6_dev
->nd_parms
->base_reachable_time
= rtime
;
1297 in6_dev
->nd_parms
->gc_staletime
= 3 * rtime
;
1298 in6_dev
->nd_parms
->reachable_time
= neigh_rand_reach_time(rtime
);
1299 in6_dev
->tstamp
= jiffies
;
1300 inet6_ifinfo_notify(RTM_NEWLINK
, in6_dev
);
1312 neigh
= __neigh_lookup(&nd_tbl
, &ipv6_hdr(skb
)->saddr
,
1316 if (ndopts
.nd_opts_src_lladdr
) {
1317 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_src_lladdr
,
1320 ND_PRINTK2(KERN_WARNING
1321 "ICMPv6 RA: invalid link-layer address length\n");
1325 neigh_update(neigh
, lladdr
, NUD_STALE
,
1326 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
1327 NEIGH_UPDATE_F_OVERRIDE
|
1328 NEIGH_UPDATE_F_OVERRIDE_ISROUTER
|
1329 NEIGH_UPDATE_F_ISROUTER
);
1332 if (!accept_ra(in6_dev
))
1335 #ifdef CONFIG_IPV6_ROUTE_INFO
1336 if (ipv6_chk_addr(dev_net(in6_dev
->dev
), &ipv6_hdr(skb
)->saddr
, NULL
, 0))
1337 goto skip_routeinfo
;
1339 if (in6_dev
->cnf
.accept_ra_rtr_pref
&& ndopts
.nd_opts_ri
) {
1340 struct nd_opt_hdr
*p
;
1341 for (p
= ndopts
.nd_opts_ri
;
1343 p
= ndisc_next_option(p
, ndopts
.nd_opts_ri_end
)) {
1344 struct route_info
*ri
= (struct route_info
*)p
;
1345 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1346 if (skb
->ndisc_nodetype
== NDISC_NODETYPE_NODEFAULT
&&
1347 ri
->prefix_len
== 0)
1350 if (ri
->prefix_len
> in6_dev
->cnf
.accept_ra_rt_info_max_plen
)
1352 rt6_route_rcv(skb
->dev
, (u8
*)p
, (p
->nd_opt_len
) << 3,
1353 &ipv6_hdr(skb
)->saddr
);
1360 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1361 /* skip link-specific ndopts from interior routers */
1362 if (skb
->ndisc_nodetype
== NDISC_NODETYPE_NODEFAULT
)
1366 if (in6_dev
->cnf
.accept_ra_pinfo
&& ndopts
.nd_opts_pi
) {
1367 struct nd_opt_hdr
*p
;
1368 for (p
= ndopts
.nd_opts_pi
;
1370 p
= ndisc_next_option(p
, ndopts
.nd_opts_pi_end
)) {
1371 addrconf_prefix_rcv(skb
->dev
, (u8
*)p
,
1372 (p
->nd_opt_len
) << 3,
1373 ndopts
.nd_opts_src_lladdr
!= NULL
);
1377 if (ndopts
.nd_opts_mtu
) {
1381 memcpy(&n
, ((u8
*)(ndopts
.nd_opts_mtu
+1))+2, sizeof(mtu
));
1384 if (mtu
< IPV6_MIN_MTU
|| mtu
> skb
->dev
->mtu
) {
1385 ND_PRINTK2(KERN_WARNING
1386 "ICMPv6 RA: invalid mtu: %d\n",
1388 } else if (in6_dev
->cnf
.mtu6
!= mtu
) {
1389 in6_dev
->cnf
.mtu6
= mtu
;
1392 dst_metric_set(&rt
->dst
, RTAX_MTU
, mtu
);
1394 rt6_mtu_change(skb
->dev
, mtu
);
1398 if (ndopts
.nd_useropts
) {
1399 struct nd_opt_hdr
*p
;
1400 for (p
= ndopts
.nd_useropts
;
1402 p
= ndisc_next_useropt(p
, ndopts
.nd_useropts_end
)) {
1403 ndisc_ra_useropt(skb
, p
);
1407 if (ndopts
.nd_opts_tgt_lladdr
|| ndopts
.nd_opts_rh
) {
1408 ND_PRINTK2(KERN_WARNING
1409 "ICMPv6 RA: invalid RA options");
1413 dst_release(&rt
->dst
);
1415 neigh_release(neigh
);
1418 static void ndisc_redirect_rcv(struct sk_buff
*skb
)
1420 struct inet6_dev
*in6_dev
;
1421 struct icmp6hdr
*icmph
;
1422 const struct in6_addr
*dest
;
1423 const struct in6_addr
*target
; /* new first hop to destination */
1424 struct neighbour
*neigh
;
1426 struct ndisc_options ndopts
;
1430 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1431 switch (skb
->ndisc_nodetype
) {
1432 case NDISC_NODETYPE_HOST
:
1433 case NDISC_NODETYPE_NODEFAULT
:
1434 ND_PRINTK2(KERN_WARNING
1435 "ICMPv6 Redirect: from host or unauthorized router\n");
1440 if (!(ipv6_addr_type(&ipv6_hdr(skb
)->saddr
) & IPV6_ADDR_LINKLOCAL
)) {
1441 ND_PRINTK2(KERN_WARNING
1442 "ICMPv6 Redirect: source address is not link-local.\n");
1446 optlen
= skb
->tail
- skb
->transport_header
;
1447 optlen
-= sizeof(struct icmp6hdr
) + 2 * sizeof(struct in6_addr
);
1450 ND_PRINTK2(KERN_WARNING
1451 "ICMPv6 Redirect: packet too short\n");
1455 icmph
= icmp6_hdr(skb
);
1456 target
= (const struct in6_addr
*) (icmph
+ 1);
1459 if (ipv6_addr_is_multicast(dest
)) {
1460 ND_PRINTK2(KERN_WARNING
1461 "ICMPv6 Redirect: destination address is multicast.\n");
1465 if (ipv6_addr_equal(dest
, target
)) {
1467 } else if (ipv6_addr_type(target
) !=
1468 (IPV6_ADDR_UNICAST
|IPV6_ADDR_LINKLOCAL
)) {
1469 ND_PRINTK2(KERN_WARNING
1470 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1474 in6_dev
= __in6_dev_get(skb
->dev
);
1477 if (in6_dev
->cnf
.forwarding
|| !in6_dev
->cnf
.accept_redirects
)
1481 * The IP source address of the Redirect MUST be the same as the current
1482 * first-hop router for the specified ICMP Destination Address.
1485 if (!ndisc_parse_options((u8
*)(dest
+ 1), optlen
, &ndopts
)) {
1486 ND_PRINTK2(KERN_WARNING
1487 "ICMPv6 Redirect: invalid ND options\n");
1490 if (ndopts
.nd_opts_tgt_lladdr
) {
1491 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_tgt_lladdr
,
1494 ND_PRINTK2(KERN_WARNING
1495 "ICMPv6 Redirect: invalid link-layer address length\n");
1500 neigh
= __neigh_lookup(&nd_tbl
, target
, skb
->dev
, 1);
1502 rt6_redirect(dest
, &ipv6_hdr(skb
)->daddr
,
1503 &ipv6_hdr(skb
)->saddr
, neigh
, lladdr
,
1505 neigh_release(neigh
);
1509 void ndisc_send_redirect(struct sk_buff
*skb
, struct neighbour
*neigh
,
1510 const struct in6_addr
*target
)
1512 struct net_device
*dev
= skb
->dev
;
1513 struct net
*net
= dev_net(dev
);
1514 struct sock
*sk
= net
->ipv6
.ndisc_sk
;
1515 int len
= sizeof(struct icmp6hdr
) + 2 * sizeof(struct in6_addr
);
1516 struct sk_buff
*buff
;
1517 struct icmp6hdr
*icmph
;
1518 struct in6_addr saddr_buf
;
1519 struct in6_addr
*addrp
;
1520 struct rt6_info
*rt
;
1521 struct dst_entry
*dst
;
1522 struct inet6_dev
*idev
;
1528 u8 ha_buf
[MAX_ADDR_LEN
], *ha
= NULL
;
1530 if (ipv6_get_lladdr(dev
, &saddr_buf
, IFA_F_TENTATIVE
)) {
1531 ND_PRINTK2(KERN_WARNING
1532 "ICMPv6 Redirect: no link-local address on %s\n",
1537 if (!ipv6_addr_equal(&ipv6_hdr(skb
)->daddr
, target
) &&
1538 ipv6_addr_type(target
) != (IPV6_ADDR_UNICAST
|IPV6_ADDR_LINKLOCAL
)) {
1539 ND_PRINTK2(KERN_WARNING
1540 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1544 icmpv6_flow_init(sk
, &fl6
, NDISC_REDIRECT
,
1545 &saddr_buf
, &ipv6_hdr(skb
)->saddr
, dev
->ifindex
);
1547 dst
= ip6_route_output(net
, NULL
, &fl6
);
1551 dst
= xfrm_lookup(net
, dst
, flowi6_to_flowi(&fl6
), NULL
, 0);
1555 rt
= (struct rt6_info
*) dst
;
1557 if (rt
->rt6i_flags
& RTF_GATEWAY
) {
1558 ND_PRINTK2(KERN_WARNING
1559 "ICMPv6 Redirect: destination is not a neighbour.\n");
1563 rt6_bind_peer(rt
, 1);
1564 if (!inet_peer_xrlim_allow(rt
->rt6i_peer
, 1*HZ
))
1567 if (dev
->addr_len
) {
1568 read_lock_bh(&neigh
->lock
);
1569 if (neigh
->nud_state
& NUD_VALID
) {
1570 memcpy(ha_buf
, neigh
->ha
, dev
->addr_len
);
1571 read_unlock_bh(&neigh
->lock
);
1573 len
+= ndisc_opt_addr_space(dev
);
1575 read_unlock_bh(&neigh
->lock
);
1578 rd_len
= min_t(unsigned int,
1579 IPV6_MIN_MTU
-sizeof(struct ipv6hdr
)-len
, skb
->len
+ 8);
1583 hlen
= LL_RESERVED_SPACE(dev
);
1584 tlen
= dev
->needed_tailroom
;
1585 buff
= sock_alloc_send_skb(sk
,
1586 (MAX_HEADER
+ sizeof(struct ipv6hdr
) +
1591 "ICMPv6 Redirect: %s() failed to allocate an skb, err=%d.\n",
1596 skb_reserve(buff
, hlen
);
1597 ip6_nd_hdr(sk
, buff
, dev
, &saddr_buf
, &ipv6_hdr(skb
)->saddr
,
1598 IPPROTO_ICMPV6
, len
);
1600 skb_set_transport_header(buff
, skb_tail_pointer(buff
) - buff
->data
);
1602 icmph
= icmp6_hdr(buff
);
1604 memset(icmph
, 0, sizeof(struct icmp6hdr
));
1605 icmph
->icmp6_type
= NDISC_REDIRECT
;
1608 * copy target and destination addresses
1611 addrp
= (struct in6_addr
*)(icmph
+ 1);
1614 *addrp
= ipv6_hdr(skb
)->daddr
;
1616 opt
= (u8
*) (addrp
+ 1);
1619 * include target_address option
1623 opt
= ndisc_fill_addr_option(opt
, ND_OPT_TARGET_LL_ADDR
, ha
,
1624 dev
->addr_len
, dev
->type
);
1627 * build redirect option and copy skb over to the new packet.
1631 *(opt
++) = ND_OPT_REDIRECT_HDR
;
1632 *(opt
++) = (rd_len
>> 3);
1635 memcpy(opt
, ipv6_hdr(skb
), rd_len
- 8);
1637 icmph
->icmp6_cksum
= csum_ipv6_magic(&saddr_buf
, &ipv6_hdr(skb
)->saddr
,
1638 len
, IPPROTO_ICMPV6
,
1639 csum_partial(icmph
, len
, 0));
1641 skb_dst_set(buff
, dst
);
1643 idev
= __in6_dev_get(dst
->dev
);
1644 IP6_UPD_PO_STATS(net
, idev
, IPSTATS_MIB_OUT
, skb
->len
);
1645 err
= NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, buff
, NULL
, dst
->dev
,
1648 ICMP6MSGOUT_INC_STATS(net
, idev
, NDISC_REDIRECT
);
1649 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTMSGS
);
1659 static void pndisc_redo(struct sk_buff
*skb
)
1665 int ndisc_rcv(struct sk_buff
*skb
)
1669 if (!pskb_may_pull(skb
, skb
->len
))
1672 msg
= (struct nd_msg
*)skb_transport_header(skb
);
1674 __skb_push(skb
, skb
->data
- skb_transport_header(skb
));
1676 if (ipv6_hdr(skb
)->hop_limit
!= 255) {
1677 ND_PRINTK2(KERN_WARNING
1678 "ICMPv6 NDISC: invalid hop-limit: %d\n",
1679 ipv6_hdr(skb
)->hop_limit
);
1683 if (msg
->icmph
.icmp6_code
!= 0) {
1684 ND_PRINTK2(KERN_WARNING
1685 "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
1686 msg
->icmph
.icmp6_code
);
1690 memset(NEIGH_CB(skb
), 0, sizeof(struct neighbour_cb
));
1692 switch (msg
->icmph
.icmp6_type
) {
1693 case NDISC_NEIGHBOUR_SOLICITATION
:
1697 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
1701 case NDISC_ROUTER_SOLICITATION
:
1705 case NDISC_ROUTER_ADVERTISEMENT
:
1706 ndisc_router_discovery(skb
);
1709 case NDISC_REDIRECT
:
1710 ndisc_redirect_rcv(skb
);
1717 static int ndisc_netdev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1719 struct net_device
*dev
= ptr
;
1720 struct net
*net
= dev_net(dev
);
1723 case NETDEV_CHANGEADDR
:
1724 neigh_changeaddr(&nd_tbl
, dev
);
1725 fib6_run_gc(~0UL, net
);
1728 neigh_ifdown(&nd_tbl
, dev
);
1729 fib6_run_gc(~0UL, net
);
1731 case NETDEV_NOTIFY_PEERS
:
1732 ndisc_send_unsol_na(dev
);
1741 static struct notifier_block ndisc_netdev_notifier
= {
1742 .notifier_call
= ndisc_netdev_event
,
1745 #ifdef CONFIG_SYSCTL
1746 static void ndisc_warn_deprecated_sysctl(struct ctl_table
*ctl
,
1747 const char *func
, const char *dev_name
)
1749 static char warncomm
[TASK_COMM_LEN
];
1751 if (strcmp(warncomm
, current
->comm
) && warned
< 5) {
1752 strcpy(warncomm
, current
->comm
);
1754 "process `%s' is using deprecated sysctl (%s) "
1755 "net.ipv6.neigh.%s.%s; "
1756 "Use net.ipv6.neigh.%s.%s_ms "
1759 dev_name
, ctl
->procname
,
1760 dev_name
, ctl
->procname
);
1765 int ndisc_ifinfo_sysctl_change(struct ctl_table
*ctl
, int write
, void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1767 struct net_device
*dev
= ctl
->extra1
;
1768 struct inet6_dev
*idev
;
1771 if ((strcmp(ctl
->procname
, "retrans_time") == 0) ||
1772 (strcmp(ctl
->procname
, "base_reachable_time") == 0))
1773 ndisc_warn_deprecated_sysctl(ctl
, "syscall", dev
? dev
->name
: "default");
1775 if (strcmp(ctl
->procname
, "retrans_time") == 0)
1776 ret
= proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
1778 else if (strcmp(ctl
->procname
, "base_reachable_time") == 0)
1779 ret
= proc_dointvec_jiffies(ctl
, write
,
1780 buffer
, lenp
, ppos
);
1782 else if ((strcmp(ctl
->procname
, "retrans_time_ms") == 0) ||
1783 (strcmp(ctl
->procname
, "base_reachable_time_ms") == 0))
1784 ret
= proc_dointvec_ms_jiffies(ctl
, write
,
1785 buffer
, lenp
, ppos
);
1789 if (write
&& ret
== 0 && dev
&& (idev
= in6_dev_get(dev
)) != NULL
) {
1790 if (ctl
->data
== &idev
->nd_parms
->base_reachable_time
)
1791 idev
->nd_parms
->reachable_time
= neigh_rand_reach_time(idev
->nd_parms
->base_reachable_time
);
1792 idev
->tstamp
= jiffies
;
1793 inet6_ifinfo_notify(RTM_NEWLINK
, idev
);
1802 static int __net_init
ndisc_net_init(struct net
*net
)
1804 struct ipv6_pinfo
*np
;
1808 err
= inet_ctl_sock_create(&sk
, PF_INET6
,
1809 SOCK_RAW
, IPPROTO_ICMPV6
, net
);
1812 "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
1817 net
->ipv6
.ndisc_sk
= sk
;
1820 np
->hop_limit
= 255;
1821 /* Do not loopback ndisc messages */
1827 static void __net_exit
ndisc_net_exit(struct net
*net
)
1829 inet_ctl_sock_destroy(net
->ipv6
.ndisc_sk
);
1832 static struct pernet_operations ndisc_net_ops
= {
1833 .init
= ndisc_net_init
,
1834 .exit
= ndisc_net_exit
,
1837 int __init
ndisc_init(void)
1841 err
= register_pernet_subsys(&ndisc_net_ops
);
1845 * Initialize the neighbour table
1847 neigh_table_init(&nd_tbl
);
1849 #ifdef CONFIG_SYSCTL
1850 err
= neigh_sysctl_register(NULL
, &nd_tbl
.parms
, "ipv6",
1851 &ndisc_ifinfo_sysctl_change
);
1853 goto out_unregister_pernet
;
1855 err
= register_netdevice_notifier(&ndisc_netdev_notifier
);
1857 goto out_unregister_sysctl
;
1861 out_unregister_sysctl
:
1862 #ifdef CONFIG_SYSCTL
1863 neigh_sysctl_unregister(&nd_tbl
.parms
);
1864 out_unregister_pernet
:
1866 unregister_pernet_subsys(&ndisc_net_ops
);
1870 void ndisc_cleanup(void)
1872 unregister_netdevice_notifier(&ndisc_netdev_notifier
);
1873 #ifdef CONFIG_SYSCTL
1874 neigh_sysctl_unregister(&nd_tbl
.parms
);
1876 neigh_table_clear(&nd_tbl
);
1877 unregister_pernet_subsys(&ndisc_net_ops
);