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 * Alexey I. Froloff : RFC6106 (DNSSL) support
19 * Pierre Ynard : export userland ND options
20 * through netlink (RDNSS support)
21 * Lars Fenneberg : fixed MTU setting on receipt
23 * Janos Farkas : kmalloc failure checks
24 * Alexey Kuznetsov : state machine reworked
25 * and moved to net/core.
26 * Pekka Savola : RFC2461 validation
27 * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
30 #define pr_fmt(fmt) "ICMPv6: " fmt
32 #include <linux/module.h>
33 #include <linux/errno.h>
34 #include <linux/types.h>
35 #include <linux/socket.h>
36 #include <linux/sockios.h>
37 #include <linux/sched.h>
38 #include <linux/net.h>
39 #include <linux/in6.h>
40 #include <linux/route.h>
41 #include <linux/init.h>
42 #include <linux/rcupdate.h>
43 #include <linux/slab.h>
45 #include <linux/sysctl.h>
48 #include <linux/if_addr.h>
49 #include <linux/if_arp.h>
50 #include <linux/ipv6.h>
51 #include <linux/icmpv6.h>
52 #include <linux/jhash.h>
58 #include <net/protocol.h>
59 #include <net/ndisc.h>
60 #include <net/ip6_route.h>
61 #include <net/addrconf.h>
64 #include <net/netlink.h>
65 #include <linux/rtnetlink.h>
68 #include <net/ip6_checksum.h>
69 #include <net/inet_common.h>
70 #include <linux/proc_fs.h>
72 #include <linux/netfilter.h>
73 #include <linux/netfilter_ipv6.h>
75 /* Set to 3 to get tracing... */
78 #define ND_PRINTK(val, level, fmt, ...) \
80 if (val <= ND_DEBUG) \
81 net_##level##_ratelimited(fmt, ##__VA_ARGS__); \
84 static u32
ndisc_hash(const void *pkey
,
85 const struct net_device
*dev
,
87 static int ndisc_constructor(struct neighbour
*neigh
);
88 static void ndisc_solicit(struct neighbour
*neigh
, struct sk_buff
*skb
);
89 static void ndisc_error_report(struct neighbour
*neigh
, struct sk_buff
*skb
);
90 static int pndisc_constructor(struct pneigh_entry
*n
);
91 static void pndisc_destructor(struct pneigh_entry
*n
);
92 static void pndisc_redo(struct sk_buff
*skb
);
94 static const struct neigh_ops ndisc_generic_ops
= {
96 .solicit
= ndisc_solicit
,
97 .error_report
= ndisc_error_report
,
98 .output
= neigh_resolve_output
,
99 .connected_output
= neigh_connected_output
,
102 static const struct neigh_ops ndisc_hh_ops
= {
104 .solicit
= ndisc_solicit
,
105 .error_report
= ndisc_error_report
,
106 .output
= neigh_resolve_output
,
107 .connected_output
= neigh_resolve_output
,
111 static const struct neigh_ops ndisc_direct_ops
= {
113 .output
= neigh_direct_output
,
114 .connected_output
= neigh_direct_output
,
117 struct neigh_table nd_tbl
= {
119 .key_len
= sizeof(struct in6_addr
),
121 .constructor
= ndisc_constructor
,
122 .pconstructor
= pndisc_constructor
,
123 .pdestructor
= pndisc_destructor
,
124 .proxy_redo
= pndisc_redo
,
128 .base_reachable_time
= ND_REACHABLE_TIME
,
129 .retrans_time
= ND_RETRANS_TIMER
,
130 .gc_staletime
= 60 * HZ
,
131 .reachable_time
= ND_REACHABLE_TIME
,
132 .delay_probe_time
= 5 * HZ
,
133 .queue_len_bytes
= 64*1024,
136 .anycast_delay
= 1 * HZ
,
137 .proxy_delay
= (8 * HZ
) / 10,
140 .gc_interval
= 30 * HZ
,
146 static void ndisc_fill_addr_option(struct sk_buff
*skb
, int type
, void *data
)
148 int pad
= ndisc_addr_option_pad(skb
->dev
->type
);
149 int data_len
= skb
->dev
->addr_len
;
150 int space
= ndisc_opt_addr_space(skb
->dev
);
151 u8
*opt
= skb_put(skb
, space
);
156 memset(opt
+ 2, 0, pad
);
160 memcpy(opt
+2, data
, data_len
);
163 if ((space
-= data_len
) > 0)
164 memset(opt
, 0, space
);
167 static struct nd_opt_hdr
*ndisc_next_option(struct nd_opt_hdr
*cur
,
168 struct nd_opt_hdr
*end
)
171 if (!cur
|| !end
|| cur
>= end
)
173 type
= cur
->nd_opt_type
;
175 cur
= ((void *)cur
) + (cur
->nd_opt_len
<< 3);
176 } while(cur
< end
&& cur
->nd_opt_type
!= type
);
177 return cur
<= end
&& cur
->nd_opt_type
== type
? cur
: NULL
;
180 static inline int ndisc_is_useropt(struct nd_opt_hdr
*opt
)
182 return opt
->nd_opt_type
== ND_OPT_RDNSS
||
183 opt
->nd_opt_type
== ND_OPT_DNSSL
;
186 static struct nd_opt_hdr
*ndisc_next_useropt(struct nd_opt_hdr
*cur
,
187 struct nd_opt_hdr
*end
)
189 if (!cur
|| !end
|| cur
>= end
)
192 cur
= ((void *)cur
) + (cur
->nd_opt_len
<< 3);
193 } while(cur
< end
&& !ndisc_is_useropt(cur
));
194 return cur
<= end
&& ndisc_is_useropt(cur
) ? cur
: NULL
;
197 struct ndisc_options
*ndisc_parse_options(u8
*opt
, int opt_len
,
198 struct ndisc_options
*ndopts
)
200 struct nd_opt_hdr
*nd_opt
= (struct nd_opt_hdr
*)opt
;
202 if (!nd_opt
|| opt_len
< 0 || !ndopts
)
204 memset(ndopts
, 0, sizeof(*ndopts
));
207 if (opt_len
< sizeof(struct nd_opt_hdr
))
209 l
= nd_opt
->nd_opt_len
<< 3;
210 if (opt_len
< l
|| l
== 0)
212 switch (nd_opt
->nd_opt_type
) {
213 case ND_OPT_SOURCE_LL_ADDR
:
214 case ND_OPT_TARGET_LL_ADDR
:
216 case ND_OPT_REDIRECT_HDR
:
217 if (ndopts
->nd_opt_array
[nd_opt
->nd_opt_type
]) {
219 "%s: duplicated ND6 option found: type=%d\n",
220 __func__
, nd_opt
->nd_opt_type
);
222 ndopts
->nd_opt_array
[nd_opt
->nd_opt_type
] = nd_opt
;
225 case ND_OPT_PREFIX_INFO
:
226 ndopts
->nd_opts_pi_end
= nd_opt
;
227 if (!ndopts
->nd_opt_array
[nd_opt
->nd_opt_type
])
228 ndopts
->nd_opt_array
[nd_opt
->nd_opt_type
] = nd_opt
;
230 #ifdef CONFIG_IPV6_ROUTE_INFO
231 case ND_OPT_ROUTE_INFO
:
232 ndopts
->nd_opts_ri_end
= nd_opt
;
233 if (!ndopts
->nd_opts_ri
)
234 ndopts
->nd_opts_ri
= nd_opt
;
238 if (ndisc_is_useropt(nd_opt
)) {
239 ndopts
->nd_useropts_end
= nd_opt
;
240 if (!ndopts
->nd_useropts
)
241 ndopts
->nd_useropts
= nd_opt
;
244 * Unknown options must be silently ignored,
245 * to accommodate future extension to the
249 "%s: ignored unsupported option; type=%d, len=%d\n",
256 nd_opt
= ((void *)nd_opt
) + l
;
261 int ndisc_mc_map(const struct in6_addr
*addr
, char *buf
, struct net_device
*dev
, int dir
)
265 case ARPHRD_IEEE802
: /* Not sure. Check it later. --ANK */
267 ipv6_eth_mc_map(addr
, buf
);
270 ipv6_arcnet_mc_map(addr
, buf
);
272 case ARPHRD_INFINIBAND
:
273 ipv6_ib_mc_map(addr
, dev
->broadcast
, buf
);
276 return ipv6_ipgre_mc_map(addr
, dev
->broadcast
, buf
);
279 memcpy(buf
, dev
->broadcast
, dev
->addr_len
);
286 EXPORT_SYMBOL(ndisc_mc_map
);
288 static u32
ndisc_hash(const void *pkey
,
289 const struct net_device
*dev
,
292 return ndisc_hashfn(pkey
, dev
, hash_rnd
);
295 static int ndisc_constructor(struct neighbour
*neigh
)
297 struct in6_addr
*addr
= (struct in6_addr
*)&neigh
->primary_key
;
298 struct net_device
*dev
= neigh
->dev
;
299 struct inet6_dev
*in6_dev
;
300 struct neigh_parms
*parms
;
301 bool is_multicast
= ipv6_addr_is_multicast(addr
);
303 in6_dev
= in6_dev_get(dev
);
304 if (in6_dev
== NULL
) {
308 parms
= in6_dev
->nd_parms
;
309 __neigh_parms_put(neigh
->parms
);
310 neigh
->parms
= neigh_parms_clone(parms
);
312 neigh
->type
= is_multicast
? RTN_MULTICAST
: RTN_UNICAST
;
313 if (!dev
->header_ops
) {
314 neigh
->nud_state
= NUD_NOARP
;
315 neigh
->ops
= &ndisc_direct_ops
;
316 neigh
->output
= neigh_direct_output
;
319 neigh
->nud_state
= NUD_NOARP
;
320 ndisc_mc_map(addr
, neigh
->ha
, dev
, 1);
321 } else if (dev
->flags
&(IFF_NOARP
|IFF_LOOPBACK
)) {
322 neigh
->nud_state
= NUD_NOARP
;
323 memcpy(neigh
->ha
, dev
->dev_addr
, dev
->addr_len
);
324 if (dev
->flags
&IFF_LOOPBACK
)
325 neigh
->type
= RTN_LOCAL
;
326 } else if (dev
->flags
&IFF_POINTOPOINT
) {
327 neigh
->nud_state
= NUD_NOARP
;
328 memcpy(neigh
->ha
, dev
->broadcast
, dev
->addr_len
);
330 if (dev
->header_ops
->cache
)
331 neigh
->ops
= &ndisc_hh_ops
;
333 neigh
->ops
= &ndisc_generic_ops
;
334 if (neigh
->nud_state
&NUD_VALID
)
335 neigh
->output
= neigh
->ops
->connected_output
;
337 neigh
->output
= neigh
->ops
->output
;
339 in6_dev_put(in6_dev
);
343 static int pndisc_constructor(struct pneigh_entry
*n
)
345 struct in6_addr
*addr
= (struct in6_addr
*)&n
->key
;
346 struct in6_addr maddr
;
347 struct net_device
*dev
= n
->dev
;
349 if (dev
== NULL
|| __in6_dev_get(dev
) == NULL
)
351 addrconf_addr_solict_mult(addr
, &maddr
);
352 ipv6_dev_mc_inc(dev
, &maddr
);
356 static void pndisc_destructor(struct pneigh_entry
*n
)
358 struct in6_addr
*addr
= (struct in6_addr
*)&n
->key
;
359 struct in6_addr maddr
;
360 struct net_device
*dev
= n
->dev
;
362 if (dev
== NULL
|| __in6_dev_get(dev
) == NULL
)
364 addrconf_addr_solict_mult(addr
, &maddr
);
365 ipv6_dev_mc_dec(dev
, &maddr
);
368 static struct sk_buff
*ndisc_alloc_skb(struct net_device
*dev
,
371 int hlen
= LL_RESERVED_SPACE(dev
);
372 int tlen
= dev
->needed_tailroom
;
373 struct sock
*sk
= dev_net(dev
)->ipv6
.ndisc_sk
;
376 skb
= alloc_skb(hlen
+ sizeof(struct ipv6hdr
) + len
+ tlen
, GFP_ATOMIC
);
378 ND_PRINTK(0, err
, "ndisc: %s failed to allocate an skb\n",
383 skb
->protocol
= htons(ETH_P_IPV6
);
386 skb_reserve(skb
, hlen
+ sizeof(struct ipv6hdr
));
387 skb_reset_transport_header(skb
);
389 /* Manually assign socket ownership as we avoid calling
390 * sock_alloc_send_pskb() to bypass wmem buffer limits
392 skb_set_owner_w(skb
, sk
);
397 static void ip6_nd_hdr(struct sk_buff
*skb
,
398 const struct in6_addr
*saddr
,
399 const struct in6_addr
*daddr
,
400 int hop_limit
, int len
)
404 skb_push(skb
, sizeof(*hdr
));
405 skb_reset_network_header(skb
);
408 ip6_flow_hdr(hdr
, 0, 0);
410 hdr
->payload_len
= htons(len
);
411 hdr
->nexthdr
= IPPROTO_ICMPV6
;
412 hdr
->hop_limit
= hop_limit
;
418 static void ndisc_send_skb(struct sk_buff
*skb
,
419 const struct in6_addr
*daddr
,
420 const struct in6_addr
*saddr
)
422 struct dst_entry
*dst
= skb_dst(skb
);
423 struct net
*net
= dev_net(skb
->dev
);
424 struct sock
*sk
= net
->ipv6
.ndisc_sk
;
425 struct inet6_dev
*idev
;
427 struct icmp6hdr
*icmp6h
= icmp6_hdr(skb
);
430 type
= icmp6h
->icmp6_type
;
435 icmpv6_flow_init(sk
, &fl6
, type
, saddr
, daddr
, skb
->dev
->ifindex
);
436 dst
= icmp6_dst_alloc(skb
->dev
, &fl6
);
442 skb_dst_set(skb
, dst
);
445 icmp6h
->icmp6_cksum
= csum_ipv6_magic(saddr
, daddr
, skb
->len
,
450 ip6_nd_hdr(skb
, saddr
, daddr
, inet6_sk(sk
)->hop_limit
, skb
->len
);
453 idev
= __in6_dev_get(dst
->dev
);
454 IP6_UPD_PO_STATS(net
, idev
, IPSTATS_MIB_OUT
, skb
->len
);
456 err
= NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
, skb
, NULL
, dst
->dev
,
459 ICMP6MSGOUT_INC_STATS(net
, idev
, type
);
460 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTMSGS
);
466 void ndisc_send_na(struct net_device
*dev
, struct neighbour
*neigh
,
467 const struct in6_addr
*daddr
,
468 const struct in6_addr
*solicited_addr
,
469 bool router
, bool solicited
, bool override
, bool inc_opt
)
472 struct in6_addr tmpaddr
;
473 struct inet6_ifaddr
*ifp
;
474 const struct in6_addr
*src_addr
;
478 /* for anycast or proxy, solicited_addr != src_addr */
479 ifp
= ipv6_get_ifaddr(dev_net(dev
), solicited_addr
, dev
, 1);
481 src_addr
= solicited_addr
;
482 if (ifp
->flags
& IFA_F_OPTIMISTIC
)
484 inc_opt
|= ifp
->idev
->cnf
.force_tllao
;
487 if (ipv6_dev_get_saddr(dev_net(dev
), dev
, daddr
,
488 inet6_sk(dev_net(dev
)->ipv6
.ndisc_sk
)->srcprefs
,
497 optlen
+= ndisc_opt_addr_space(dev
);
499 skb
= ndisc_alloc_skb(dev
, sizeof(*msg
) + optlen
);
503 msg
= (struct nd_msg
*)skb_put(skb
, sizeof(*msg
));
504 *msg
= (struct nd_msg
) {
506 .icmp6_type
= NDISC_NEIGHBOUR_ADVERTISEMENT
,
507 .icmp6_router
= router
,
508 .icmp6_solicited
= solicited
,
509 .icmp6_override
= override
,
511 .target
= *solicited_addr
,
515 ndisc_fill_addr_option(skb
, ND_OPT_TARGET_LL_ADDR
,
519 ndisc_send_skb(skb
, daddr
, src_addr
);
522 static void ndisc_send_unsol_na(struct net_device
*dev
)
524 struct inet6_dev
*idev
;
525 struct inet6_ifaddr
*ifa
;
527 idev
= in6_dev_get(dev
);
531 read_lock_bh(&idev
->lock
);
532 list_for_each_entry(ifa
, &idev
->addr_list
, if_list
) {
533 ndisc_send_na(dev
, NULL
, &in6addr_linklocal_allnodes
, &ifa
->addr
,
534 /*router=*/ !!idev
->cnf
.forwarding
,
535 /*solicited=*/ false, /*override=*/ true,
538 read_unlock_bh(&idev
->lock
);
543 void ndisc_send_ns(struct net_device
*dev
, struct neighbour
*neigh
,
544 const struct in6_addr
*solicit
,
545 const struct in6_addr
*daddr
, const struct in6_addr
*saddr
)
548 struct in6_addr addr_buf
;
549 int inc_opt
= dev
->addr_len
;
554 if (ipv6_get_lladdr(dev
, &addr_buf
,
555 (IFA_F_TENTATIVE
|IFA_F_OPTIMISTIC
)))
560 if (ipv6_addr_any(saddr
))
563 optlen
+= ndisc_opt_addr_space(dev
);
565 skb
= ndisc_alloc_skb(dev
, sizeof(*msg
) + optlen
);
569 msg
= (struct nd_msg
*)skb_put(skb
, sizeof(*msg
));
570 *msg
= (struct nd_msg
) {
572 .icmp6_type
= NDISC_NEIGHBOUR_SOLICITATION
,
578 ndisc_fill_addr_option(skb
, ND_OPT_SOURCE_LL_ADDR
,
581 ndisc_send_skb(skb
, daddr
, saddr
);
584 void ndisc_send_rs(struct net_device
*dev
, const struct in6_addr
*saddr
,
585 const struct in6_addr
*daddr
)
589 int send_sllao
= dev
->addr_len
;
592 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
594 * According to section 2.2 of RFC 4429, we must not
595 * send router solicitations with a sllao from
596 * optimistic addresses, but we may send the solicitation
597 * if we don't include the sllao. So here we check
598 * if our address is optimistic, and if so, we
599 * suppress the inclusion of the sllao.
602 struct inet6_ifaddr
*ifp
= ipv6_get_ifaddr(dev_net(dev
), saddr
,
605 if (ifp
->flags
& IFA_F_OPTIMISTIC
) {
615 optlen
+= ndisc_opt_addr_space(dev
);
617 skb
= ndisc_alloc_skb(dev
, sizeof(*msg
) + optlen
);
621 msg
= (struct rs_msg
*)skb_put(skb
, sizeof(*msg
));
622 *msg
= (struct rs_msg
) {
624 .icmp6_type
= NDISC_ROUTER_SOLICITATION
,
629 ndisc_fill_addr_option(skb
, ND_OPT_SOURCE_LL_ADDR
,
632 ndisc_send_skb(skb
, daddr
, saddr
);
636 static void ndisc_error_report(struct neighbour
*neigh
, struct sk_buff
*skb
)
639 * "The sender MUST return an ICMP
640 * destination unreachable"
642 dst_link_failure(skb
);
646 /* Called with locked neigh: either read or both */
648 static void ndisc_solicit(struct neighbour
*neigh
, struct sk_buff
*skb
)
650 struct in6_addr
*saddr
= NULL
;
651 struct in6_addr mcaddr
;
652 struct net_device
*dev
= neigh
->dev
;
653 struct in6_addr
*target
= (struct in6_addr
*)&neigh
->primary_key
;
654 int probes
= atomic_read(&neigh
->probes
);
656 if (skb
&& ipv6_chk_addr(dev_net(dev
), &ipv6_hdr(skb
)->saddr
, dev
, 1))
657 saddr
= &ipv6_hdr(skb
)->saddr
;
659 if ((probes
-= neigh
->parms
->ucast_probes
) < 0) {
660 if (!(neigh
->nud_state
& NUD_VALID
)) {
662 "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
665 ndisc_send_ns(dev
, neigh
, target
, target
, saddr
);
666 } else if ((probes
-= neigh
->parms
->app_probes
) < 0) {
669 addrconf_addr_solict_mult(target
, &mcaddr
);
670 ndisc_send_ns(dev
, NULL
, target
, &mcaddr
, saddr
);
674 static int pndisc_is_router(const void *pkey
,
675 struct net_device
*dev
)
677 struct pneigh_entry
*n
;
680 read_lock_bh(&nd_tbl
.lock
);
681 n
= __pneigh_lookup(&nd_tbl
, dev_net(dev
), pkey
, dev
);
683 ret
= !!(n
->flags
& NTF_ROUTER
);
684 read_unlock_bh(&nd_tbl
.lock
);
689 static void ndisc_recv_ns(struct sk_buff
*skb
)
691 struct nd_msg
*msg
= (struct nd_msg
*)skb_transport_header(skb
);
692 const struct in6_addr
*saddr
= &ipv6_hdr(skb
)->saddr
;
693 const struct in6_addr
*daddr
= &ipv6_hdr(skb
)->daddr
;
695 u32 ndoptlen
= skb_tail_pointer(skb
) - (skb_transport_header(skb
) +
696 offsetof(struct nd_msg
, opt
));
697 struct ndisc_options ndopts
;
698 struct net_device
*dev
= skb
->dev
;
699 struct inet6_ifaddr
*ifp
;
700 struct inet6_dev
*idev
= NULL
;
701 struct neighbour
*neigh
;
702 int dad
= ipv6_addr_any(saddr
);
706 if (skb
->len
< sizeof(struct nd_msg
)) {
707 ND_PRINTK(2, warn
, "NS: packet too short\n");
711 if (ipv6_addr_is_multicast(&msg
->target
)) {
712 ND_PRINTK(2, warn
, "NS: multicast target address\n");
718 * DAD has to be destined for solicited node multicast address.
720 if (dad
&& !ipv6_addr_is_solict_mult(daddr
)) {
721 ND_PRINTK(2, warn
, "NS: bad DAD packet (wrong destination)\n");
725 if (!ndisc_parse_options(msg
->opt
, ndoptlen
, &ndopts
)) {
726 ND_PRINTK(2, warn
, "NS: invalid ND options\n");
730 if (ndopts
.nd_opts_src_lladdr
) {
731 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_src_lladdr
, dev
);
734 "NS: invalid link-layer address length\n");
739 * If the IP source address is the unspecified address,
740 * there MUST NOT be source link-layer address option
745 "NS: bad DAD packet (link-layer address option)\n");
750 inc
= ipv6_addr_is_multicast(daddr
);
752 ifp
= ipv6_get_ifaddr(dev_net(dev
), &msg
->target
, dev
, 1);
755 if (ifp
->flags
& (IFA_F_TENTATIVE
|IFA_F_OPTIMISTIC
)) {
758 * We are colliding with another node
760 * so fail our DAD process
762 addrconf_dad_failure(ifp
);
766 * This is not a dad solicitation.
767 * If we are an optimistic node,
769 * Otherwise, we should ignore it.
771 if (!(ifp
->flags
& IFA_F_OPTIMISTIC
))
778 struct net
*net
= dev_net(dev
);
780 idev
= in6_dev_get(dev
);
782 /* XXX: count this drop? */
786 if (ipv6_chk_acast_addr(net
, dev
, &msg
->target
) ||
787 (idev
->cnf
.forwarding
&&
788 (net
->ipv6
.devconf_all
->proxy_ndp
|| idev
->cnf
.proxy_ndp
) &&
789 (is_router
= pndisc_is_router(&msg
->target
, dev
)) >= 0)) {
790 if (!(NEIGH_CB(skb
)->flags
& LOCALLY_ENQUEUED
) &&
791 skb
->pkt_type
!= PACKET_HOST
&&
793 idev
->nd_parms
->proxy_delay
!= 0) {
795 * for anycast or proxy,
796 * sender should delay its response
797 * by a random time between 0 and
798 * MAX_ANYCAST_DELAY_TIME seconds.
799 * (RFC2461) -- yoshfuji
801 struct sk_buff
*n
= skb_clone(skb
, GFP_ATOMIC
);
803 pneigh_enqueue(&nd_tbl
, idev
->nd_parms
, n
);
811 is_router
= idev
->cnf
.forwarding
;
814 ndisc_send_na(dev
, NULL
, &in6addr_linklocal_allnodes
, &msg
->target
,
815 !!is_router
, false, (ifp
!= NULL
), true);
820 NEIGH_CACHE_STAT_INC(&nd_tbl
, rcv_probes_mcast
);
822 NEIGH_CACHE_STAT_INC(&nd_tbl
, rcv_probes_ucast
);
825 * update / create cache entry
826 * for the source address
828 neigh
= __neigh_lookup(&nd_tbl
, saddr
, dev
,
829 !inc
|| lladdr
|| !dev
->addr_len
);
831 neigh_update(neigh
, lladdr
, NUD_STALE
,
832 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
833 NEIGH_UPDATE_F_OVERRIDE
);
834 if (neigh
|| !dev
->header_ops
) {
835 ndisc_send_na(dev
, neigh
, saddr
, &msg
->target
,
837 true, (ifp
!= NULL
&& inc
), inc
);
839 neigh_release(neigh
);
849 static void ndisc_recv_na(struct sk_buff
*skb
)
851 struct nd_msg
*msg
= (struct nd_msg
*)skb_transport_header(skb
);
852 const struct in6_addr
*saddr
= &ipv6_hdr(skb
)->saddr
;
853 const struct in6_addr
*daddr
= &ipv6_hdr(skb
)->daddr
;
855 u32 ndoptlen
= skb_tail_pointer(skb
) - (skb_transport_header(skb
) +
856 offsetof(struct nd_msg
, opt
));
857 struct ndisc_options ndopts
;
858 struct net_device
*dev
= skb
->dev
;
859 struct inet6_ifaddr
*ifp
;
860 struct neighbour
*neigh
;
862 if (skb
->len
< sizeof(struct nd_msg
)) {
863 ND_PRINTK(2, warn
, "NA: packet too short\n");
867 if (ipv6_addr_is_multicast(&msg
->target
)) {
868 ND_PRINTK(2, warn
, "NA: target address is multicast\n");
872 if (ipv6_addr_is_multicast(daddr
) &&
873 msg
->icmph
.icmp6_solicited
) {
874 ND_PRINTK(2, warn
, "NA: solicited NA is multicasted\n");
878 if (!ndisc_parse_options(msg
->opt
, ndoptlen
, &ndopts
)) {
879 ND_PRINTK(2, warn
, "NS: invalid ND option\n");
882 if (ndopts
.nd_opts_tgt_lladdr
) {
883 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_tgt_lladdr
, dev
);
886 "NA: invalid link-layer address length\n");
890 ifp
= ipv6_get_ifaddr(dev_net(dev
), &msg
->target
, dev
, 1);
892 if (skb
->pkt_type
!= PACKET_LOOPBACK
893 && (ifp
->flags
& IFA_F_TENTATIVE
)) {
894 addrconf_dad_failure(ifp
);
897 /* What should we make now? The advertisement
898 is invalid, but ndisc specs say nothing
899 about it. It could be misconfiguration, or
900 an smart proxy agent tries to help us :-)
902 We should not print the error if NA has been
903 received from loopback - it is just our own
904 unsolicited advertisement.
906 if (skb
->pkt_type
!= PACKET_LOOPBACK
)
908 "NA: someone advertises our address %pI6 on %s!\n",
909 &ifp
->addr
, ifp
->idev
->dev
->name
);
913 neigh
= neigh_lookup(&nd_tbl
, &msg
->target
, dev
);
916 u8 old_flags
= neigh
->flags
;
917 struct net
*net
= dev_net(dev
);
919 if (neigh
->nud_state
& NUD_FAILED
)
923 * Don't update the neighbor cache entry on a proxy NA from
924 * ourselves because either the proxied node is off link or it
925 * has already sent a NA to us.
927 if (lladdr
&& !memcmp(lladdr
, dev
->dev_addr
, dev
->addr_len
) &&
928 net
->ipv6
.devconf_all
->forwarding
&& net
->ipv6
.devconf_all
->proxy_ndp
&&
929 pneigh_lookup(&nd_tbl
, net
, &msg
->target
, dev
, 0)) {
930 /* XXX: idev->cnf.proxy_ndp */
934 neigh_update(neigh
, lladdr
,
935 msg
->icmph
.icmp6_solicited
? NUD_REACHABLE
: NUD_STALE
,
936 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
937 (msg
->icmph
.icmp6_override
? NEIGH_UPDATE_F_OVERRIDE
: 0)|
938 NEIGH_UPDATE_F_OVERRIDE_ISROUTER
|
939 (msg
->icmph
.icmp6_router
? NEIGH_UPDATE_F_ISROUTER
: 0));
941 if ((old_flags
& ~neigh
->flags
) & NTF_ROUTER
) {
943 * Change: router to host
946 rt
= rt6_get_dflt_router(saddr
, dev
);
952 neigh_release(neigh
);
956 static void ndisc_recv_rs(struct sk_buff
*skb
)
958 struct rs_msg
*rs_msg
= (struct rs_msg
*)skb_transport_header(skb
);
959 unsigned long ndoptlen
= skb
->len
- sizeof(*rs_msg
);
960 struct neighbour
*neigh
;
961 struct inet6_dev
*idev
;
962 const struct in6_addr
*saddr
= &ipv6_hdr(skb
)->saddr
;
963 struct ndisc_options ndopts
;
966 if (skb
->len
< sizeof(*rs_msg
))
969 idev
= __in6_dev_get(skb
->dev
);
971 ND_PRINTK(1, err
, "RS: can't find in6 device\n");
975 /* Don't accept RS if we're not in router mode */
976 if (!idev
->cnf
.forwarding
)
980 * Don't update NCE if src = ::;
981 * this implies that the source node has no ip address assigned yet.
983 if (ipv6_addr_any(saddr
))
986 /* Parse ND options */
987 if (!ndisc_parse_options(rs_msg
->opt
, ndoptlen
, &ndopts
)) {
988 ND_PRINTK(2, notice
, "NS: invalid ND option, ignored\n");
992 if (ndopts
.nd_opts_src_lladdr
) {
993 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_src_lladdr
,
999 neigh
= __neigh_lookup(&nd_tbl
, saddr
, skb
->dev
, 1);
1001 neigh_update(neigh
, lladdr
, NUD_STALE
,
1002 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
1003 NEIGH_UPDATE_F_OVERRIDE
|
1004 NEIGH_UPDATE_F_OVERRIDE_ISROUTER
);
1005 neigh_release(neigh
);
1011 static void ndisc_ra_useropt(struct sk_buff
*ra
, struct nd_opt_hdr
*opt
)
1013 struct icmp6hdr
*icmp6h
= (struct icmp6hdr
*)skb_transport_header(ra
);
1014 struct sk_buff
*skb
;
1015 struct nlmsghdr
*nlh
;
1016 struct nduseroptmsg
*ndmsg
;
1017 struct net
*net
= dev_net(ra
->dev
);
1019 int base_size
= NLMSG_ALIGN(sizeof(struct nduseroptmsg
)
1020 + (opt
->nd_opt_len
<< 3));
1021 size_t msg_size
= base_size
+ nla_total_size(sizeof(struct in6_addr
));
1023 skb
= nlmsg_new(msg_size
, GFP_ATOMIC
);
1029 nlh
= nlmsg_put(skb
, 0, 0, RTM_NEWNDUSEROPT
, base_size
, 0);
1031 goto nla_put_failure
;
1034 ndmsg
= nlmsg_data(nlh
);
1035 ndmsg
->nduseropt_family
= AF_INET6
;
1036 ndmsg
->nduseropt_ifindex
= ra
->dev
->ifindex
;
1037 ndmsg
->nduseropt_icmp_type
= icmp6h
->icmp6_type
;
1038 ndmsg
->nduseropt_icmp_code
= icmp6h
->icmp6_code
;
1039 ndmsg
->nduseropt_opts_len
= opt
->nd_opt_len
<< 3;
1041 memcpy(ndmsg
+ 1, opt
, opt
->nd_opt_len
<< 3);
1043 if (nla_put(skb
, NDUSEROPT_SRCADDR
, sizeof(struct in6_addr
),
1044 &ipv6_hdr(ra
)->saddr
))
1045 goto nla_put_failure
;
1046 nlmsg_end(skb
, nlh
);
1048 rtnl_notify(skb
, net
, 0, RTNLGRP_ND_USEROPT
, NULL
, GFP_ATOMIC
);
1055 rtnl_set_sk_err(net
, RTNLGRP_ND_USEROPT
, err
);
1058 static void ndisc_router_discovery(struct sk_buff
*skb
)
1060 struct ra_msg
*ra_msg
= (struct ra_msg
*)skb_transport_header(skb
);
1061 struct neighbour
*neigh
= NULL
;
1062 struct inet6_dev
*in6_dev
;
1063 struct rt6_info
*rt
= NULL
;
1065 struct ndisc_options ndopts
;
1067 unsigned int pref
= 0;
1069 __u8
* opt
= (__u8
*)(ra_msg
+ 1);
1071 optlen
= (skb_tail_pointer(skb
) - skb_transport_header(skb
)) -
1072 sizeof(struct ra_msg
);
1074 if (!(ipv6_addr_type(&ipv6_hdr(skb
)->saddr
) & IPV6_ADDR_LINKLOCAL
)) {
1075 ND_PRINTK(2, warn
, "RA: source address is not link-local\n");
1079 ND_PRINTK(2, warn
, "RA: packet too short\n");
1083 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1084 if (skb
->ndisc_nodetype
== NDISC_NODETYPE_HOST
) {
1085 ND_PRINTK(2, warn
, "RA: from host or unauthorized router\n");
1091 * set the RA_RECV flag in the interface
1094 in6_dev
= __in6_dev_get(skb
->dev
);
1095 if (in6_dev
== NULL
) {
1096 ND_PRINTK(0, err
, "RA: can't find inet6 device for %s\n",
1101 if (!ndisc_parse_options(opt
, optlen
, &ndopts
)) {
1102 ND_PRINTK(2, warn
, "RA: invalid ND options\n");
1106 if (!ipv6_accept_ra(in6_dev
))
1107 goto skip_linkparms
;
1109 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1110 /* skip link-specific parameters from interior routers */
1111 if (skb
->ndisc_nodetype
== NDISC_NODETYPE_NODEFAULT
)
1112 goto skip_linkparms
;
1115 if (in6_dev
->if_flags
& IF_RS_SENT
) {
1117 * flag that an RA was received after an RS was sent
1118 * out on this interface.
1120 in6_dev
->if_flags
|= IF_RA_RCVD
;
1124 * Remember the managed/otherconf flags from most recently
1125 * received RA message (RFC 2462) -- yoshfuji
1127 in6_dev
->if_flags
= (in6_dev
->if_flags
& ~(IF_RA_MANAGED
|
1129 (ra_msg
->icmph
.icmp6_addrconf_managed
?
1130 IF_RA_MANAGED
: 0) |
1131 (ra_msg
->icmph
.icmp6_addrconf_other
?
1132 IF_RA_OTHERCONF
: 0);
1134 if (!in6_dev
->cnf
.accept_ra_defrtr
)
1137 if (ipv6_chk_addr(dev_net(in6_dev
->dev
), &ipv6_hdr(skb
)->saddr
, NULL
, 0))
1140 lifetime
= ntohs(ra_msg
->icmph
.icmp6_rt_lifetime
);
1142 #ifdef CONFIG_IPV6_ROUTER_PREF
1143 pref
= ra_msg
->icmph
.icmp6_router_pref
;
1144 /* 10b is handled as if it were 00b (medium) */
1145 if (pref
== ICMPV6_ROUTER_PREF_INVALID
||
1146 !in6_dev
->cnf
.accept_ra_rtr_pref
)
1147 pref
= ICMPV6_ROUTER_PREF_MEDIUM
;
1150 rt
= rt6_get_dflt_router(&ipv6_hdr(skb
)->saddr
, skb
->dev
);
1153 neigh
= dst_neigh_lookup(&rt
->dst
, &ipv6_hdr(skb
)->saddr
);
1156 "RA: %s got default router without neighbour\n",
1162 if (rt
&& lifetime
== 0) {
1167 if (rt
== NULL
&& lifetime
) {
1168 ND_PRINTK(3, dbg
, "RA: adding default router\n");
1170 rt
= rt6_add_dflt_router(&ipv6_hdr(skb
)->saddr
, skb
->dev
, pref
);
1173 "RA: %s failed to add default route\n",
1178 neigh
= dst_neigh_lookup(&rt
->dst
, &ipv6_hdr(skb
)->saddr
);
1179 if (neigh
== NULL
) {
1181 "RA: %s got default router without neighbour\n",
1186 neigh
->flags
|= NTF_ROUTER
;
1188 rt
->rt6i_flags
= (rt
->rt6i_flags
& ~RTF_PREF_MASK
) | RTF_PREF(pref
);
1192 rt6_set_expires(rt
, jiffies
+ (HZ
* lifetime
));
1193 if (ra_msg
->icmph
.icmp6_hop_limit
) {
1194 in6_dev
->cnf
.hop_limit
= ra_msg
->icmph
.icmp6_hop_limit
;
1196 dst_metric_set(&rt
->dst
, RTAX_HOPLIMIT
,
1197 ra_msg
->icmph
.icmp6_hop_limit
);
1203 * Update Reachable Time and Retrans Timer
1206 if (in6_dev
->nd_parms
) {
1207 unsigned long rtime
= ntohl(ra_msg
->retrans_timer
);
1209 if (rtime
&& rtime
/1000 < MAX_SCHEDULE_TIMEOUT
/HZ
) {
1210 rtime
= (rtime
*HZ
)/1000;
1213 in6_dev
->nd_parms
->retrans_time
= rtime
;
1214 in6_dev
->tstamp
= jiffies
;
1215 inet6_ifinfo_notify(RTM_NEWLINK
, in6_dev
);
1218 rtime
= ntohl(ra_msg
->reachable_time
);
1219 if (rtime
&& rtime
/1000 < MAX_SCHEDULE_TIMEOUT
/(3*HZ
)) {
1220 rtime
= (rtime
*HZ
)/1000;
1225 if (rtime
!= in6_dev
->nd_parms
->base_reachable_time
) {
1226 in6_dev
->nd_parms
->base_reachable_time
= rtime
;
1227 in6_dev
->nd_parms
->gc_staletime
= 3 * rtime
;
1228 in6_dev
->nd_parms
->reachable_time
= neigh_rand_reach_time(rtime
);
1229 in6_dev
->tstamp
= jiffies
;
1230 inet6_ifinfo_notify(RTM_NEWLINK
, in6_dev
);
1242 neigh
= __neigh_lookup(&nd_tbl
, &ipv6_hdr(skb
)->saddr
,
1246 if (ndopts
.nd_opts_src_lladdr
) {
1247 lladdr
= ndisc_opt_addr_data(ndopts
.nd_opts_src_lladdr
,
1251 "RA: invalid link-layer address length\n");
1255 neigh_update(neigh
, lladdr
, NUD_STALE
,
1256 NEIGH_UPDATE_F_WEAK_OVERRIDE
|
1257 NEIGH_UPDATE_F_OVERRIDE
|
1258 NEIGH_UPDATE_F_OVERRIDE_ISROUTER
|
1259 NEIGH_UPDATE_F_ISROUTER
);
1262 if (!ipv6_accept_ra(in6_dev
))
1265 #ifdef CONFIG_IPV6_ROUTE_INFO
1266 if (ipv6_chk_addr(dev_net(in6_dev
->dev
), &ipv6_hdr(skb
)->saddr
, NULL
, 0))
1267 goto skip_routeinfo
;
1269 if (in6_dev
->cnf
.accept_ra_rtr_pref
&& ndopts
.nd_opts_ri
) {
1270 struct nd_opt_hdr
*p
;
1271 for (p
= ndopts
.nd_opts_ri
;
1273 p
= ndisc_next_option(p
, ndopts
.nd_opts_ri_end
)) {
1274 struct route_info
*ri
= (struct route_info
*)p
;
1275 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1276 if (skb
->ndisc_nodetype
== NDISC_NODETYPE_NODEFAULT
&&
1277 ri
->prefix_len
== 0)
1280 if (ri
->prefix_len
> in6_dev
->cnf
.accept_ra_rt_info_max_plen
)
1282 rt6_route_rcv(skb
->dev
, (u8
*)p
, (p
->nd_opt_len
) << 3,
1283 &ipv6_hdr(skb
)->saddr
);
1290 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1291 /* skip link-specific ndopts from interior routers */
1292 if (skb
->ndisc_nodetype
== NDISC_NODETYPE_NODEFAULT
)
1296 if (in6_dev
->cnf
.accept_ra_pinfo
&& ndopts
.nd_opts_pi
) {
1297 struct nd_opt_hdr
*p
;
1298 for (p
= ndopts
.nd_opts_pi
;
1300 p
= ndisc_next_option(p
, ndopts
.nd_opts_pi_end
)) {
1301 addrconf_prefix_rcv(skb
->dev
, (u8
*)p
,
1302 (p
->nd_opt_len
) << 3,
1303 ndopts
.nd_opts_src_lladdr
!= NULL
);
1307 if (ndopts
.nd_opts_mtu
) {
1311 memcpy(&n
, ((u8
*)(ndopts
.nd_opts_mtu
+1))+2, sizeof(mtu
));
1314 if (mtu
< IPV6_MIN_MTU
|| mtu
> skb
->dev
->mtu
) {
1315 ND_PRINTK(2, warn
, "RA: invalid mtu: %d\n", mtu
);
1316 } else if (in6_dev
->cnf
.mtu6
!= mtu
) {
1317 in6_dev
->cnf
.mtu6
= mtu
;
1320 dst_metric_set(&rt
->dst
, RTAX_MTU
, mtu
);
1322 rt6_mtu_change(skb
->dev
, mtu
);
1326 if (ndopts
.nd_useropts
) {
1327 struct nd_opt_hdr
*p
;
1328 for (p
= ndopts
.nd_useropts
;
1330 p
= ndisc_next_useropt(p
, ndopts
.nd_useropts_end
)) {
1331 ndisc_ra_useropt(skb
, p
);
1335 if (ndopts
.nd_opts_tgt_lladdr
|| ndopts
.nd_opts_rh
) {
1336 ND_PRINTK(2, warn
, "RA: invalid RA options\n");
1341 neigh_release(neigh
);
1344 static void ndisc_redirect_rcv(struct sk_buff
*skb
)
1347 struct ndisc_options ndopts
;
1348 struct rd_msg
*msg
= (struct rd_msg
*)skb_transport_header(skb
);
1349 u32 ndoptlen
= skb_tail_pointer(skb
) - (skb_transport_header(skb
) +
1350 offsetof(struct rd_msg
, opt
));
1352 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1353 switch (skb
->ndisc_nodetype
) {
1354 case NDISC_NODETYPE_HOST
:
1355 case NDISC_NODETYPE_NODEFAULT
:
1357 "Redirect: from host or unauthorized router\n");
1362 if (!(ipv6_addr_type(&ipv6_hdr(skb
)->saddr
) & IPV6_ADDR_LINKLOCAL
)) {
1364 "Redirect: source address is not link-local\n");
1368 if (!ndisc_parse_options(msg
->opt
, ndoptlen
, &ndopts
))
1371 if (!ndopts
.nd_opts_rh
) {
1372 ip6_redirect_no_header(skb
, dev_net(skb
->dev
),
1373 skb
->dev
->ifindex
, 0);
1377 hdr
= (u8
*)ndopts
.nd_opts_rh
;
1379 if (!pskb_pull(skb
, hdr
- skb_transport_header(skb
)))
1382 icmpv6_notify(skb
, NDISC_REDIRECT
, 0, 0);
1385 static void ndisc_fill_redirect_hdr_option(struct sk_buff
*skb
,
1386 struct sk_buff
*orig_skb
,
1389 u8
*opt
= skb_put(skb
, rd_len
);
1392 *(opt
++) = ND_OPT_REDIRECT_HDR
;
1393 *(opt
++) = (rd_len
>> 3);
1396 memcpy(opt
, ipv6_hdr(orig_skb
), rd_len
- 8);
1399 void ndisc_send_redirect(struct sk_buff
*skb
, const struct in6_addr
*target
)
1401 struct net_device
*dev
= skb
->dev
;
1402 struct net
*net
= dev_net(dev
);
1403 struct sock
*sk
= net
->ipv6
.ndisc_sk
;
1405 struct inet_peer
*peer
;
1406 struct sk_buff
*buff
;
1408 struct in6_addr saddr_buf
;
1409 struct rt6_info
*rt
;
1410 struct dst_entry
*dst
;
1413 u8 ha_buf
[MAX_ADDR_LEN
], *ha
= NULL
;
1416 if (ipv6_get_lladdr(dev
, &saddr_buf
, IFA_F_TENTATIVE
)) {
1417 ND_PRINTK(2, warn
, "Redirect: no link-local address on %s\n",
1422 if (!ipv6_addr_equal(&ipv6_hdr(skb
)->daddr
, target
) &&
1423 ipv6_addr_type(target
) != (IPV6_ADDR_UNICAST
|IPV6_ADDR_LINKLOCAL
)) {
1425 "Redirect: target address is not link-local unicast\n");
1429 icmpv6_flow_init(sk
, &fl6
, NDISC_REDIRECT
,
1430 &saddr_buf
, &ipv6_hdr(skb
)->saddr
, dev
->ifindex
);
1432 dst
= ip6_route_output(net
, NULL
, &fl6
);
1437 dst
= xfrm_lookup(net
, dst
, flowi6_to_flowi(&fl6
), NULL
, 0);
1441 rt
= (struct rt6_info
*) dst
;
1443 if (rt
->rt6i_flags
& RTF_GATEWAY
) {
1445 "Redirect: destination is not a neighbour\n");
1448 peer
= inet_getpeer_v6(net
->ipv6
.peers
, &rt
->rt6i_dst
.addr
, 1);
1449 ret
= inet_peer_xrlim_allow(peer
, 1*HZ
);
1455 if (dev
->addr_len
) {
1456 struct neighbour
*neigh
= dst_neigh_lookup(skb_dst(skb
), target
);
1459 "Redirect: no neigh for target address\n");
1463 read_lock_bh(&neigh
->lock
);
1464 if (neigh
->nud_state
& NUD_VALID
) {
1465 memcpy(ha_buf
, neigh
->ha
, dev
->addr_len
);
1466 read_unlock_bh(&neigh
->lock
);
1468 optlen
+= ndisc_opt_addr_space(dev
);
1470 read_unlock_bh(&neigh
->lock
);
1472 neigh_release(neigh
);
1475 rd_len
= min_t(unsigned int,
1476 IPV6_MIN_MTU
- sizeof(struct ipv6hdr
) - sizeof(*msg
) - optlen
,
1481 buff
= ndisc_alloc_skb(dev
, sizeof(*msg
) + optlen
);
1485 msg
= (struct rd_msg
*)skb_put(buff
, sizeof(*msg
));
1486 *msg
= (struct rd_msg
) {
1488 .icmp6_type
= NDISC_REDIRECT
,
1491 .dest
= ipv6_hdr(skb
)->daddr
,
1495 * include target_address option
1499 ndisc_fill_addr_option(buff
, ND_OPT_TARGET_LL_ADDR
, ha
);
1502 * build redirect option and copy skb over to the new packet.
1506 ndisc_fill_redirect_hdr_option(buff
, skb
, rd_len
);
1508 skb_dst_set(buff
, dst
);
1509 ndisc_send_skb(buff
, &ipv6_hdr(skb
)->saddr
, &saddr_buf
);
1516 static void pndisc_redo(struct sk_buff
*skb
)
1522 static bool ndisc_suppress_frag_ndisc(struct sk_buff
*skb
)
1524 struct inet6_dev
*idev
= __in6_dev_get(skb
->dev
);
1528 if (IP6CB(skb
)->flags
& IP6SKB_FRAGMENTED
&&
1529 idev
->cnf
.suppress_frag_ndisc
) {
1530 net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n");
1536 int ndisc_rcv(struct sk_buff
*skb
)
1540 if (ndisc_suppress_frag_ndisc(skb
))
1543 if (skb_linearize(skb
))
1546 msg
= (struct nd_msg
*)skb_transport_header(skb
);
1548 __skb_push(skb
, skb
->data
- skb_transport_header(skb
));
1550 if (ipv6_hdr(skb
)->hop_limit
!= 255) {
1551 ND_PRINTK(2, warn
, "NDISC: invalid hop-limit: %d\n",
1552 ipv6_hdr(skb
)->hop_limit
);
1556 if (msg
->icmph
.icmp6_code
!= 0) {
1557 ND_PRINTK(2, warn
, "NDISC: invalid ICMPv6 code: %d\n",
1558 msg
->icmph
.icmp6_code
);
1562 memset(NEIGH_CB(skb
), 0, sizeof(struct neighbour_cb
));
1564 switch (msg
->icmph
.icmp6_type
) {
1565 case NDISC_NEIGHBOUR_SOLICITATION
:
1569 case NDISC_NEIGHBOUR_ADVERTISEMENT
:
1573 case NDISC_ROUTER_SOLICITATION
:
1577 case NDISC_ROUTER_ADVERTISEMENT
:
1578 ndisc_router_discovery(skb
);
1581 case NDISC_REDIRECT
:
1582 ndisc_redirect_rcv(skb
);
1589 static int ndisc_netdev_event(struct notifier_block
*this, unsigned long event
, void *ptr
)
1591 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
1592 struct net
*net
= dev_net(dev
);
1593 struct inet6_dev
*idev
;
1596 case NETDEV_CHANGEADDR
:
1597 neigh_changeaddr(&nd_tbl
, dev
);
1598 fib6_run_gc(0, net
, false);
1599 idev
= in6_dev_get(dev
);
1602 if (idev
->cnf
.ndisc_notify
)
1603 ndisc_send_unsol_na(dev
);
1607 neigh_ifdown(&nd_tbl
, dev
);
1608 fib6_run_gc(0, net
, false);
1610 case NETDEV_NOTIFY_PEERS
:
1611 ndisc_send_unsol_na(dev
);
1620 static struct notifier_block ndisc_netdev_notifier
= {
1621 .notifier_call
= ndisc_netdev_event
,
1624 #ifdef CONFIG_SYSCTL
1625 static void ndisc_warn_deprecated_sysctl(struct ctl_table
*ctl
,
1626 const char *func
, const char *dev_name
)
1628 static char warncomm
[TASK_COMM_LEN
];
1630 if (strcmp(warncomm
, current
->comm
) && warned
< 5) {
1631 strcpy(warncomm
, current
->comm
);
1632 pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
1634 dev_name
, ctl
->procname
,
1635 dev_name
, ctl
->procname
);
1640 int ndisc_ifinfo_sysctl_change(struct ctl_table
*ctl
, int write
, void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
1642 struct net_device
*dev
= ctl
->extra1
;
1643 struct inet6_dev
*idev
;
1646 if ((strcmp(ctl
->procname
, "retrans_time") == 0) ||
1647 (strcmp(ctl
->procname
, "base_reachable_time") == 0))
1648 ndisc_warn_deprecated_sysctl(ctl
, "syscall", dev
? dev
->name
: "default");
1650 if (strcmp(ctl
->procname
, "retrans_time") == 0)
1651 ret
= proc_dointvec(ctl
, write
, buffer
, lenp
, ppos
);
1653 else if (strcmp(ctl
->procname
, "base_reachable_time") == 0)
1654 ret
= proc_dointvec_jiffies(ctl
, write
,
1655 buffer
, lenp
, ppos
);
1657 else if ((strcmp(ctl
->procname
, "retrans_time_ms") == 0) ||
1658 (strcmp(ctl
->procname
, "base_reachable_time_ms") == 0))
1659 ret
= proc_dointvec_ms_jiffies(ctl
, write
,
1660 buffer
, lenp
, ppos
);
1664 if (write
&& ret
== 0 && dev
&& (idev
= in6_dev_get(dev
)) != NULL
) {
1665 if (ctl
->data
== &idev
->nd_parms
->base_reachable_time
)
1666 idev
->nd_parms
->reachable_time
= neigh_rand_reach_time(idev
->nd_parms
->base_reachable_time
);
1667 idev
->tstamp
= jiffies
;
1668 inet6_ifinfo_notify(RTM_NEWLINK
, idev
);
1677 static int __net_init
ndisc_net_init(struct net
*net
)
1679 struct ipv6_pinfo
*np
;
1683 err
= inet_ctl_sock_create(&sk
, PF_INET6
,
1684 SOCK_RAW
, IPPROTO_ICMPV6
, net
);
1687 "NDISC: Failed to initialize the control socket (err %d)\n",
1692 net
->ipv6
.ndisc_sk
= sk
;
1695 np
->hop_limit
= 255;
1696 /* Do not loopback ndisc messages */
1702 static void __net_exit
ndisc_net_exit(struct net
*net
)
1704 inet_ctl_sock_destroy(net
->ipv6
.ndisc_sk
);
1707 static struct pernet_operations ndisc_net_ops
= {
1708 .init
= ndisc_net_init
,
1709 .exit
= ndisc_net_exit
,
1712 int __init
ndisc_init(void)
1716 err
= register_pernet_subsys(&ndisc_net_ops
);
1720 * Initialize the neighbour table
1722 neigh_table_init(&nd_tbl
);
1724 #ifdef CONFIG_SYSCTL
1725 err
= neigh_sysctl_register(NULL
, &nd_tbl
.parms
, "ipv6",
1726 &ndisc_ifinfo_sysctl_change
);
1728 goto out_unregister_pernet
;
1733 #ifdef CONFIG_SYSCTL
1734 out_unregister_pernet
:
1735 unregister_pernet_subsys(&ndisc_net_ops
);
1740 int __init
ndisc_late_init(void)
1742 return register_netdevice_notifier(&ndisc_netdev_notifier
);
1745 void ndisc_late_cleanup(void)
1747 unregister_netdevice_notifier(&ndisc_netdev_notifier
);
1750 void ndisc_cleanup(void)
1752 #ifdef CONFIG_SYSCTL
1753 neigh_sysctl_unregister(&nd_tbl
.parms
);
1755 neigh_table_clear(&nd_tbl
);
1756 unregister_pernet_subsys(&ndisc_net_ops
);