3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Ian P. Morris <I.P.Morris@soton.ac.uk>
9 * $Id: ip6_input.c,v 1.19 2000/12/13 18:31:50 davem Exp $
11 * Based in linux/net/ipv4/ip_input.c
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
20 * Mitsuru KANDA @USAGI and
21 * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/sched.h>
29 #include <linux/net.h>
30 #include <linux/netdevice.h>
31 #include <linux/in6.h>
32 #include <linux/icmpv6.h>
34 #include <linux/netfilter.h>
35 #include <linux/netfilter_ipv6.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/rawv6.h>
44 #include <net/ndisc.h>
45 #include <net/ip6_route.h>
46 #include <net/addrconf.h>
51 inline int ip6_rcv_finish( struct sk_buff
*skb
)
56 return dst_input(skb
);
59 int ipv6_rcv(struct sk_buff
*skb
, struct net_device
*dev
, struct packet_type
*pt
, struct net_device
*orig_dev
)
64 if (skb
->pkt_type
== PACKET_OTHERHOST
)
67 IP6_INC_STATS_BH(IPSTATS_MIB_INRECEIVES
);
69 if ((skb
= skb_share_check(skb
, GFP_ATOMIC
)) == NULL
) {
70 IP6_INC_STATS_BH(IPSTATS_MIB_INDISCARDS
);
75 * Store incoming device index. When the packet will
76 * be queued, we cannot refer to skb->dev anymore.
78 * BTW, when we send a packet for our own local address on a
79 * non-loopback interface (e.g. ethX), it is being delivered
80 * via the loopback interface (lo) here; skb->dev = &loopback_dev.
81 * It, however, should be considered as if it is being
82 * arrived via the sending interface (ethX), because of the
83 * nature of scoping architecture. --yoshfuji
85 IP6CB(skb
)->iif
= skb
->dst
? ((struct rt6_info
*)skb
->dst
)->rt6i_idev
->dev
->ifindex
: dev
->ifindex
;
87 if (unlikely(!pskb_may_pull(skb
, sizeof(*hdr
))))
92 if (hdr
->version
!= 6)
95 skb
->h
.raw
= (u8
*)(hdr
+ 1);
96 IP6CB(skb
)->nhoff
= offsetof(struct ipv6hdr
, nexthdr
);
98 pkt_len
= ntohs(hdr
->payload_len
);
100 /* pkt_len may be zero if Jumbo payload option is present */
101 if (pkt_len
|| hdr
->nexthdr
!= NEXTHDR_HOP
) {
102 if (pkt_len
+ sizeof(struct ipv6hdr
) > skb
->len
)
104 if (pskb_trim_rcsum(skb
, pkt_len
+ sizeof(struct ipv6hdr
))) {
105 IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS
);
111 if (hdr
->nexthdr
== NEXTHDR_HOP
) {
112 if (ipv6_parse_hopopts(skb
) < 0) {
113 IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS
);
118 return NF_HOOK(PF_INET6
,NF_IP6_PRE_ROUTING
, skb
, dev
, NULL
, ip6_rcv_finish
);
120 IP6_INC_STATS_BH(IPSTATS_MIB_INTRUNCATEDPKTS
);
122 IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS
);
130 * Deliver the packet to the host
134 static inline int ip6_input_finish(struct sk_buff
*skb
)
136 struct inet6_protocol
*ipprot
;
143 * Parse extension headers
148 if (!pskb_pull(skb
, skb
->h
.raw
- skb
->data
))
150 nhoff
= IP6CB(skb
)->nhoff
;
151 nexthdr
= skb
->nh
.raw
[nhoff
];
153 raw_sk
= sk_head(&raw_v6_htable
[nexthdr
& (MAX_INET_PROTOS
- 1)]);
154 if (raw_sk
&& !ipv6_raw_deliver(skb
, nexthdr
))
157 hash
= nexthdr
& (MAX_INET_PROTOS
- 1);
158 if ((ipprot
= rcu_dereference(inet6_protos
[hash
])) != NULL
) {
161 if (ipprot
->flags
& INET6_PROTO_FINAL
) {
164 /* Free reference early: we don't need it any more,
165 and it may hold ip_conntrack module loaded
169 skb_postpull_rcsum(skb
, skb
->nh
.raw
,
170 skb
->h
.raw
- skb
->nh
.raw
);
172 if (ipv6_addr_is_multicast(&hdr
->daddr
) &&
173 !ipv6_chk_mcast_addr(skb
->dev
, &hdr
->daddr
,
175 !ipv6_is_mld(skb
, nexthdr
))
178 if (!(ipprot
->flags
& INET6_PROTO_NOPOLICY
) &&
179 !xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
182 ret
= ipprot
->handler(&skb
);
186 IP6_INC_STATS_BH(IPSTATS_MIB_INDELIVERS
);
189 if (xfrm6_policy_check(NULL
, XFRM_POLICY_IN
, skb
)) {
190 IP6_INC_STATS_BH(IPSTATS_MIB_INUNKNOWNPROTOS
);
191 icmpv6_send(skb
, ICMPV6_PARAMPROB
,
192 ICMPV6_UNK_NEXTHDR
, nhoff
,
196 IP6_INC_STATS_BH(IPSTATS_MIB_INDELIVERS
);
203 IP6_INC_STATS_BH(IPSTATS_MIB_INDISCARDS
);
210 int ip6_input(struct sk_buff
*skb
)
212 return NF_HOOK(PF_INET6
,NF_IP6_LOCAL_IN
, skb
, skb
->dev
, NULL
, ip6_input_finish
);
215 int ip6_mc_input(struct sk_buff
*skb
)
220 IP6_INC_STATS_BH(IPSTATS_MIB_INMCASTPKTS
);
223 deliver
= likely(!(skb
->dev
->flags
& (IFF_PROMISC
|IFF_ALLMULTI
))) ||
224 ipv6_chk_mcast_addr(skb
->dev
, &hdr
->daddr
, NULL
);
227 * IPv6 multicast router mode isnt currently supported.
230 if (ipv6_config
.multicast_route
) {
233 addr_type
= ipv6_addr_type(&hdr
->daddr
);
235 if (!(addr_type
& (IPV6_ADDR_LOOPBACK
| IPV6_ADDR_LINKLOCAL
))) {
236 struct sk_buff
*skb2
;
237 struct dst_entry
*dst
;
242 skb2
= skb_clone(skb
, GFP_ATOMIC
);
252 if (likely(deliver
)) {