3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Ian P. Morris <I.P.Morris@soton.ac.uk>
9 * Based in linux/net/ipv4/ip_input.c
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
18 * Mitsuru KANDA @USAGI and
19 * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
22 #include <linux/errno.h>
23 #include <linux/types.h>
24 #include <linux/socket.h>
25 #include <linux/sockios.h>
26 #include <linux/net.h>
27 #include <linux/netdevice.h>
28 #include <linux/in6.h>
29 #include <linux/icmpv6.h>
30 #include <linux/mroute6.h>
32 #include <linux/netfilter.h>
33 #include <linux/netfilter_ipv6.h>
39 #include <net/protocol.h>
40 #include <net/transp_v6.h>
41 #include <net/rawv6.h>
42 #include <net/ndisc.h>
43 #include <net/ip6_route.h>
44 #include <net/addrconf.h>
49 inline int ip6_rcv_finish( struct sk_buff
*skb
)
54 return dst_input(skb
);
57 int ipv6_rcv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
61 struct inet6_dev
*idev
;
62 struct net
*net
= dev_net(skb
->dev
);
64 if (skb
->pkt_type
== PACKET_OTHERHOST
) {
71 idev
= __in6_dev_get(skb
->dev
);
73 IP6_UPD_PO_STATS_BH(net
, idev
, IPSTATS_MIB_IN
, skb
->len
);
75 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
||
76 !idev
|| unlikely(idev
->cnf
.disable_ipv6
)) {
77 IP6_INC_STATS_BH(net
, idev
, IPSTATS_MIB_INDISCARDS
);
81 memset(IP6CB(skb
), 0, sizeof(struct inet6_skb_parm
));
84 * Store incoming device index. When the packet will
85 * be queued, we cannot refer to skb->dev anymore.
87 * BTW, when we send a packet for our own local address on a
88 * non-loopback interface (e.g. ethX), it is being delivered
89 * via the loopback interface (lo) here; skb->dev = loopback_dev.
90 * It, however, should be considered as if it is being
91 * arrived via the sending interface (ethX), because of the
92 * nature of scoping architecture. --yoshfuji
94 IP6CB(skb
)->iif
= skb
->dst
? ip6_dst_idev(skb
->dst
)->dev
->ifindex
: dev
->ifindex
;
96 if (unlikely(!pskb_may_pull(skb
, sizeof(*hdr
))))
101 if (hdr
->version
!= 6)
106 * A packet received on an interface with a destination address
107 * of loopback must be dropped.
109 if (!(dev
->flags
& IFF_LOOPBACK
) &&
110 ipv6_addr_loopback(&hdr
->daddr
))
113 skb
->transport_header
= skb
->network_header
+ sizeof(*hdr
);
114 IP6CB(skb
)->nhoff
= offsetof(struct ipv6hdr
, nexthdr
);
116 pkt_len
= ntohs(hdr
->payload_len
);
118 /* pkt_len may be zero if Jumbo payload option is present */
119 if (pkt_len
|| hdr
->nexthdr
!= NEXTHDR_HOP
) {
120 if (pkt_len
+ sizeof(struct ipv6hdr
) > skb
->len
) {
121 IP6_INC_STATS_BH(net
,
122 idev
, IPSTATS_MIB_INTRUNCATEDPKTS
);
125 if (pskb_trim_rcsum(skb
, pkt_len
+ sizeof(struct ipv6hdr
))) {
126 IP6_INC_STATS_BH(net
, idev
, IPSTATS_MIB_INHDRERRORS
);
132 if (hdr
->nexthdr
== NEXTHDR_HOP
) {
133 if (ipv6_parse_hopopts(skb
) < 0) {
134 IP6_INC_STATS_BH(net
, idev
, IPSTATS_MIB_INHDRERRORS
);
142 return NF_HOOK(PF_INET6
, NF_INET_PRE_ROUTING
, skb
, dev
, NULL
,
145 IP6_INC_STATS_BH(net
, idev
, IPSTATS_MIB_INHDRERRORS
);
153 * Deliver the packet to the host
157 static int ip6_input_finish(struct sk_buff
*skb
)
159 struct inet6_protocol
*ipprot
;
163 struct inet6_dev
*idev
;
164 struct net
*net
= dev_net(skb
->dst
->dev
);
167 * Parse extension headers
172 idev
= ip6_dst_idev(skb
->dst
);
173 if (!pskb_pull(skb
, skb_transport_offset(skb
)))
175 nhoff
= IP6CB(skb
)->nhoff
;
176 nexthdr
= skb_network_header(skb
)[nhoff
];
178 raw
= raw6_local_deliver(skb
, nexthdr
);
180 hash
= nexthdr
& (MAX_INET_PROTOS
- 1);
181 if ((ipprot
= rcu_dereference(inet6_protos
[hash
])) != NULL
) {
184 if (ipprot
->flags
& INET6_PROTO_FINAL
) {
187 /* Free reference early: we don't need it any more,
188 and it may hold ip_conntrack module loaded
192 skb_postpull_rcsum(skb
, skb_network_header(skb
),
193 skb_network_header_len(skb
));
195 if (ipv6_addr_is_multicast(&hdr
->daddr
) &&
196 !ipv6_chk_mcast_addr(skb
->dev
, &hdr
->daddr
,
198 !ipv6_is_mld(skb
, nexthdr
))
201 if (!(ipprot
->flags
& INET6_PROTO_NOPOLICY
) &&
202 !xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
205 ret
= ipprot
->handler(skb
);
209 IP6_INC_STATS_BH(net
, idev
, IPSTATS_MIB_INDELIVERS
);
212 if (xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
213 IP6_INC_STATS_BH(net
, idev
,
214 IPSTATS_MIB_INUNKNOWNPROTOS
);
215 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
216 ICMPV6_UNK_NEXTHDR
, nhoff
,
220 IP6_INC_STATS_BH(net
, idev
, IPSTATS_MIB_INDELIVERS
);
227 IP6_INC_STATS_BH(net
, idev
, IPSTATS_MIB_INDISCARDS
);
234 int ip6_input(struct sk_buff
*skb
)
236 return NF_HOOK(PF_INET6
, NF_INET_LOCAL_IN
, skb
, skb
->dev
, NULL
,
240 int ip6_mc_input(struct sk_buff
*skb
)
245 IP6_UPD_PO_STATS_BH(dev_net(skb
->dst
->dev
),
246 ip6_dst_idev(skb
->dst
), IPSTATS_MIB_INMCAST
,
250 deliver
= ipv6_chk_mcast_addr(skb
->dev
, &hdr
->daddr
, NULL
);
252 #ifdef CONFIG_IPV6_MROUTE
254 * IPv6 multicast router mode is now supported ;)
256 if (dev_net(skb
->dev
)->ipv6
.devconf_all
->mc_forwarding
&&
257 !(ipv6_addr_type(&hdr
->daddr
) & IPV6_ADDR_LINKLOCAL
) &&
258 likely(!(IP6CB(skb
)->flags
& IP6SKB_FORWARDED
))) {
260 * Okay, we try to forward - split and duplicate
263 struct sk_buff
*skb2
;
264 struct inet6_skb_parm
*opt
= IP6CB(skb
);
267 if (unlikely(opt
->ra
)) {
268 /* Check if this is a mld message */
269 u8
*ptr
= skb_network_header(skb
) + opt
->ra
;
270 struct icmp6hdr
*icmp6
;
271 u8 nexthdr
= hdr
->nexthdr
;
274 /* Check if the value of Router Alert
275 * is for MLD (0x0000).
277 if ((ptr
[2] | ptr
[3]) == 0) {
280 if (!ipv6_ext_hdr(nexthdr
)) {
284 offset
= ipv6_skip_exthdr(skb
, sizeof(*hdr
),
289 if (nexthdr
!= IPPROTO_ICMPV6
)
292 if (!pskb_may_pull(skb
, (skb_network_header(skb
) +
293 offset
+ 1 - skb
->data
)))
296 icmp6
= (struct icmp6hdr
*)(skb_network_header(skb
) + offset
);
298 switch (icmp6
->icmp6_type
) {
299 case ICMPV6_MGM_QUERY
:
300 case ICMPV6_MGM_REPORT
:
301 case ICMPV6_MGM_REDUCTION
:
302 case ICMPV6_MLD2_REPORT
:
308 /* unknown RA - process it normally */
312 skb2
= skb_clone(skb
, GFP_ATOMIC
);