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)) {