ACPI: thinkpad-acpi: preserve radio state across shutdown
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / ip6_input.c
blobe55427dcd9f59c2ce75309721be184ea70002c1d
1 /*
2 * IPv6 input
3 * Linux INET6 implementation
5 * Authors:
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.
16 /* Changes
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>
35 #include <net/sock.h>
36 #include <net/snmp.h>
38 #include <net/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>
45 #include <net/xfrm.h>
49 inline int ip6_rcv_finish( struct sk_buff *skb)
51 if (skb->dst == NULL)
52 ip6_route_input(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)
59 struct ipv6hdr *hdr;
60 u32 pkt_len;
61 struct inet6_dev *idev;
63 if (skb->pkt_type == PACKET_OTHERHOST) {
64 kfree_skb(skb);
65 return 0;
68 rcu_read_lock();
70 idev = __in6_dev_get(skb->dev);
72 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INRECEIVES);
74 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
75 !idev || unlikely(idev->cnf.disable_ipv6)) {
76 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS);
77 goto drop;
80 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
83 * Store incoming device index. When the packet will
84 * be queued, we cannot refer to skb->dev anymore.
86 * BTW, when we send a packet for our own local address on a
87 * non-loopback interface (e.g. ethX), it is being delivered
88 * via the loopback interface (lo) here; skb->dev = loopback_dev.
89 * It, however, should be considered as if it is being
90 * arrived via the sending interface (ethX), because of the
91 * nature of scoping architecture. --yoshfuji
93 IP6CB(skb)->iif = skb->dst ? ip6_dst_idev(skb->dst)->dev->ifindex : dev->ifindex;
95 if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
96 goto err;
98 hdr = ipv6_hdr(skb);
100 if (hdr->version != 6)
101 goto err;
104 * RFC4291 2.5.3
105 * A packet received on an interface with a destination address
106 * of loopback must be dropped.
108 if (!(dev->flags & IFF_LOOPBACK) &&
109 ipv6_addr_loopback(&hdr->daddr))
110 goto err;
112 skb->transport_header = skb->network_header + sizeof(*hdr);
113 IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
115 pkt_len = ntohs(hdr->payload_len);
117 /* pkt_len may be zero if Jumbo payload option is present */
118 if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
119 if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
120 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INTRUNCATEDPKTS);
121 goto drop;
123 if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
124 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
125 goto drop;
127 hdr = ipv6_hdr(skb);
130 if (hdr->nexthdr == NEXTHDR_HOP) {
131 if (ipv6_parse_hopopts(skb) < 0) {
132 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
133 rcu_read_unlock();
134 return 0;
138 rcu_read_unlock();
140 return NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, dev, NULL,
141 ip6_rcv_finish);
142 err:
143 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
144 drop:
145 rcu_read_unlock();
146 kfree_skb(skb);
147 return 0;
151 * Deliver the packet to the host
155 static int ip6_input_finish(struct sk_buff *skb)
157 struct inet6_protocol *ipprot;
158 unsigned int nhoff;
159 int nexthdr, raw;
160 u8 hash;
161 struct inet6_dev *idev;
164 * Parse extension headers
167 rcu_read_lock();
168 resubmit:
169 idev = ip6_dst_idev(skb->dst);
170 if (!pskb_pull(skb, skb_transport_offset(skb)))
171 goto discard;
172 nhoff = IP6CB(skb)->nhoff;
173 nexthdr = skb_network_header(skb)[nhoff];
175 raw = raw6_local_deliver(skb, nexthdr);
177 hash = nexthdr & (MAX_INET_PROTOS - 1);
178 if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) {
179 int ret;
181 if (ipprot->flags & INET6_PROTO_FINAL) {
182 struct ipv6hdr *hdr;
184 /* Free reference early: we don't need it any more,
185 and it may hold ip_conntrack module loaded
186 indefinitely. */
187 nf_reset(skb);
189 skb_postpull_rcsum(skb, skb_network_header(skb),
190 skb_network_header_len(skb));
191 hdr = ipv6_hdr(skb);
192 if (ipv6_addr_is_multicast(&hdr->daddr) &&
193 !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr,
194 &hdr->saddr) &&
195 !ipv6_is_mld(skb, nexthdr))
196 goto discard;
198 if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
199 !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
200 goto discard;
202 ret = ipprot->handler(skb);
203 if (ret > 0)
204 goto resubmit;
205 else if (ret == 0)
206 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS);
207 } else {
208 if (!raw) {
209 if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
210 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INUNKNOWNPROTOS);
211 icmpv6_send(skb, ICMPV6_PARAMPROB,
212 ICMPV6_UNK_NEXTHDR, nhoff,
213 skb->dev);
215 } else
216 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS);
217 kfree_skb(skb);
219 rcu_read_unlock();
220 return 0;
222 discard:
223 IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS);
224 rcu_read_unlock();
225 kfree_skb(skb);
226 return 0;
230 int ip6_input(struct sk_buff *skb)
232 return NF_HOOK(PF_INET6, NF_INET_LOCAL_IN, skb, skb->dev, NULL,
233 ip6_input_finish);
236 int ip6_mc_input(struct sk_buff *skb)
238 struct ipv6hdr *hdr;
239 int deliver;
241 IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS);
243 hdr = ipv6_hdr(skb);
244 deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
246 #ifdef CONFIG_IPV6_MROUTE
248 * IPv6 multicast router mode is now supported ;)
250 if (dev_net(skb->dev)->ipv6.devconf_all->mc_forwarding &&
251 likely(!(IP6CB(skb)->flags & IP6SKB_FORWARDED))) {
253 * Okay, we try to forward - split and duplicate
254 * packets.
256 struct sk_buff *skb2;
257 struct inet6_skb_parm *opt = IP6CB(skb);
259 /* Check for MLD */
260 if (unlikely(opt->ra)) {
261 /* Check if this is a mld message */
262 u8 *ptr = skb_network_header(skb) + opt->ra;
263 struct icmp6hdr *icmp6;
264 u8 nexthdr = hdr->nexthdr;
265 int offset;
267 /* Check if the value of Router Alert
268 * is for MLD (0x0000).
270 if ((ptr[2] | ptr[3]) == 0) {
271 deliver = 0;
273 if (!ipv6_ext_hdr(nexthdr)) {
274 /* BUG */
275 goto out;
277 offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
278 &nexthdr);
279 if (offset < 0)
280 goto out;
282 if (nexthdr != IPPROTO_ICMPV6)
283 goto out;
285 if (!pskb_may_pull(skb, (skb_network_header(skb) +
286 offset + 1 - skb->data)))
287 goto out;
289 icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
291 switch (icmp6->icmp6_type) {
292 case ICMPV6_MGM_QUERY:
293 case ICMPV6_MGM_REPORT:
294 case ICMPV6_MGM_REDUCTION:
295 case ICMPV6_MLD2_REPORT:
296 deliver = 1;
297 break;
299 goto out;
301 /* unknown RA - process it normally */
304 if (deliver)
305 skb2 = skb_clone(skb, GFP_ATOMIC);
306 else {
307 skb2 = skb;
308 skb = NULL;
311 if (skb2) {
312 skb2->dev = skb2->dst->dev;
313 ip6_mr_input(skb2);
316 out:
317 #endif
318 if (likely(deliver))
319 ip6_input(skb);
320 else {
321 /* discard */
322 kfree_skb(skb);
325 return 0;