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 static 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)
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);
74 /* Store incoming device index. When the packet will
75 be queued, we cannot refer to skb->dev anymore.
77 IP6CB(skb)->iif = dev->ifindex;
79 if (skb->len < sizeof(struct ipv6hdr))
82 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) {
83 IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
89 if (hdr->version != 6)
92 pkt_len = ntohs(hdr->payload_len);
94 /* pkt_len may be zero if Jumbo payload option is present */
95 if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
96 if (pkt_len + sizeof(struct ipv6hdr) > skb->len)
98 if (pkt_len + sizeof(struct ipv6hdr) < skb->len) {
99 if (__pskb_trim(skb, pkt_len + sizeof(struct ipv6hdr))){
100 IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
104 if (skb->ip_summed == CHECKSUM_HW)
105 skb->ip_summed = CHECKSUM_NONE;
109 if (hdr->nexthdr == NEXTHDR_HOP) {
110 skb->h.raw = (u8*)(hdr+1);
111 if (ipv6_parse_hopopts(skb, offsetof(struct ipv6hdr, nexthdr)) < 0) {
112 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 skb->h.raw = skb->nh.raw + sizeof(struct ipv6hdr);
146 * Parse extension headers
149 nexthdr = skb->nh.ipv6h->nexthdr;
150 nhoff = offsetof(struct ipv6hdr, nexthdr);
152 /* Skip hop-by-hop options, they are already parsed. */
153 if (nexthdr == NEXTHDR_HOP) {
154 nhoff = sizeof(struct ipv6hdr);
155 nexthdr = skb->h.raw[0];
156 skb->h.raw += (skb->h.raw[1]+1)<<3;
161 if (!pskb_pull(skb, skb->h.raw - skb->data))
163 nexthdr = skb->nh.raw[nhoff];
165 raw_sk = sk_head(&raw_v6_htable[nexthdr & (MAX_INET_PROTOS - 1)]);
167 ipv6_raw_deliver(skb, nexthdr);
169 hash = nexthdr & (MAX_INET_PROTOS - 1);
170 if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) {
173 if (ipprot->flags & INET6_PROTO_FINAL) {
176 if (!cksum_sub && skb->ip_summed == CHECKSUM_HW) {
177 skb->csum = csum_sub(skb->csum,
178 csum_partial(skb->nh.raw, skb->h.raw-skb->nh.raw, 0));
182 if (ipv6_addr_is_multicast(&hdr->daddr) &&
183 !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
185 !ipv6_is_mld(skb, nexthdr))
188 if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
189 !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
192 ret = ipprot->handler(&skb, &nhoff);
196 IP6_INC_STATS_BH(IPSTATS_MIB_INDELIVERS);
199 if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
200 IP6_INC_STATS_BH(IPSTATS_MIB_INUNKNOWNPROTOS);
201 icmpv6_param_prob(skb, ICMPV6_UNK_NEXTHDR, nhoff);
204 IP6_INC_STATS_BH(IPSTATS_MIB_INDELIVERS);
212 IP6_INC_STATS_BH(IPSTATS_MIB_INDISCARDS);
219 int ip6_input(struct sk_buff *skb)
221 return NF_HOOK(PF_INET6,NF_IP6_LOCAL_IN, skb, skb->dev, NULL, ip6_input_finish);
224 int ip6_mc_input(struct sk_buff *skb)
229 IP6_INC_STATS_BH(IPSTATS_MIB_INMCASTPKTS);
232 deliver = likely(!(skb->dev->flags & (IFF_PROMISC|IFF_ALLMULTI))) ||
233 ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
236 * IPv6 multicast router mode isnt currently supported.
239 if (ipv6_config.multicast_route) {
242 addr_type = ipv6_addr_type(&hdr->daddr);
244 if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) {
245 struct sk_buff *skb2;
246 struct dst_entry *dst;
251 skb2 = skb_clone(skb, GFP_ATOMIC);
261 if (likely(deliver)) {