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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IPv6 input | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * Ian P. Morris <I.P.Morris@soton.ac.uk> | |
8 | * | |
9 | * $Id: ip6_input.c,v 1.19 2000/12/13 18:31:50 davem Exp $ | |
10 | * | |
11 | * Based in linux/net/ipv4/ip_input.c | |
12 | * | |
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. | |
17 | */ | |
18 | /* Changes | |
19 | * | |
20 | * Mitsuru KANDA @USAGI and | |
21 | * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs(). | |
22 | */ | |
23 | ||
24 | #include <linux/errno.h> | |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/in6.h> | |
31 | #include <linux/icmpv6.h> | |
32 | ||
33 | #include <linux/netfilter.h> | |
34 | #include <linux/netfilter_ipv6.h> | |
35 | ||
36 | #include <net/sock.h> | |
37 | #include <net/snmp.h> | |
38 | ||
39 | #include <net/ipv6.h> | |
40 | #include <net/protocol.h> | |
41 | #include <net/transp_v6.h> | |
42 | #include <net/rawv6.h> | |
43 | #include <net/ndisc.h> | |
44 | #include <net/ip6_route.h> | |
45 | #include <net/addrconf.h> | |
46 | #include <net/xfrm.h> | |
47 | ||
48 | ||
49 | ||
1ab1457c | 50 | inline int ip6_rcv_finish( struct sk_buff *skb) |
1da177e4 LT |
51 | { |
52 | if (skb->dst == NULL) | |
53 | ip6_route_input(skb); | |
54 | ||
55 | return dst_input(skb); | |
56 | } | |
57 | ||
f2ccd8fa | 58 | int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev) |
1da177e4 LT |
59 | { |
60 | struct ipv6hdr *hdr; | |
61 | u32 pkt_len; | |
a11d206d | 62 | struct inet6_dev *idev; |
1da177e4 | 63 | |
a11d206d YH |
64 | if (skb->pkt_type == PACKET_OTHERHOST) { |
65 | kfree_skb(skb); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | rcu_read_lock(); | |
1da177e4 | 70 | |
a11d206d YH |
71 | idev = __in6_dev_get(skb->dev); |
72 | ||
73 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INRECEIVES); | |
1da177e4 LT |
74 | |
75 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { | |
a11d206d YH |
76 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS); |
77 | rcu_read_unlock(); | |
1da177e4 LT |
78 | goto out; |
79 | } | |
80 | ||
6b7fdc3a GC |
81 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
82 | ||
1da177e4 LT |
83 | /* |
84 | * Store incoming device index. When the packet will | |
85 | * be queued, we cannot refer to skb->dev anymore. | |
86 | * | |
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 | |
de3cb747 | 89 | * via the loopback interface (lo) here; skb->dev = loopback_dev. |
1da177e4 LT |
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 | |
93 | */ | |
7a3025b1 | 94 | IP6CB(skb)->iif = skb->dst ? ip6_dst_idev(skb->dst)->dev->ifindex : dev->ifindex; |
1da177e4 | 95 | |
2889139a | 96 | if (unlikely(!pskb_may_pull(skb, sizeof(*hdr)))) |
1da177e4 LT |
97 | goto err; |
98 | ||
0660e03f | 99 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
100 | |
101 | if (hdr->version != 6) | |
102 | goto err; | |
103 | ||
b0e380b1 | 104 | skb->transport_header = skb->network_header + sizeof(*hdr); |
951dbc8a PM |
105 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
106 | ||
1da177e4 LT |
107 | pkt_len = ntohs(hdr->payload_len); |
108 | ||
109 | /* pkt_len may be zero if Jumbo payload option is present */ | |
110 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
60e5c166 MC |
111 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) { |
112 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INTRUNCATEDPKTS); | |
113 | goto drop; | |
114 | } | |
1da177e4 | 115 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) { |
a11d206d | 116 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
117 | goto drop; |
118 | } | |
0660e03f | 119 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
120 | } |
121 | ||
122 | if (hdr->nexthdr == NEXTHDR_HOP) { | |
e5bbef20 | 123 | if (ipv6_parse_hopopts(skb) < 0) { |
a11d206d YH |
124 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
125 | rcu_read_unlock(); | |
1da177e4 LT |
126 | return 0; |
127 | } | |
1da177e4 LT |
128 | } |
129 | ||
a11d206d YH |
130 | rcu_read_unlock(); |
131 | ||
6e23ae2a PM |
132 | return NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, dev, NULL, |
133 | ip6_rcv_finish); | |
1da177e4 | 134 | err: |
a11d206d | 135 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 136 | drop: |
a11d206d | 137 | rcu_read_unlock(); |
1da177e4 LT |
138 | kfree_skb(skb); |
139 | out: | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /* | |
144 | * Deliver the packet to the host | |
145 | */ | |
146 | ||
147 | ||
ad643a79 | 148 | static int ip6_input_finish(struct sk_buff *skb) |
1da177e4 LT |
149 | { |
150 | struct inet6_protocol *ipprot; | |
1da177e4 | 151 | unsigned int nhoff; |
69d6da0b | 152 | int nexthdr, raw; |
1da177e4 | 153 | u8 hash; |
a11d206d | 154 | struct inet6_dev *idev; |
1da177e4 | 155 | |
1da177e4 LT |
156 | /* |
157 | * Parse extension headers | |
158 | */ | |
159 | ||
1da177e4 LT |
160 | rcu_read_lock(); |
161 | resubmit: | |
a11d206d | 162 | idev = ip6_dst_idev(skb->dst); |
ea2ae17d | 163 | if (!pskb_pull(skb, skb_transport_offset(skb))) |
1da177e4 | 164 | goto discard; |
951dbc8a | 165 | nhoff = IP6CB(skb)->nhoff; |
d56f90a7 | 166 | nexthdr = skb_network_header(skb)[nhoff]; |
1da177e4 | 167 | |
69d6da0b | 168 | raw = raw6_local_deliver(skb, nexthdr); |
1da177e4 LT |
169 | |
170 | hash = nexthdr & (MAX_INET_PROTOS - 1); | |
171 | if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) { | |
172 | int ret; | |
1ab1457c | 173 | |
1da177e4 | 174 | if (ipprot->flags & INET6_PROTO_FINAL) { |
1ab1457c | 175 | struct ipv6hdr *hdr; |
1da177e4 | 176 | |
9fb9cbb1 YK |
177 | /* Free reference early: we don't need it any more, |
178 | and it may hold ip_conntrack module loaded | |
179 | indefinitely. */ | |
180 | nf_reset(skb); | |
181 | ||
d56f90a7 | 182 | skb_postpull_rcsum(skb, skb_network_header(skb), |
cfe1fc77 | 183 | skb_network_header_len(skb)); |
0660e03f | 184 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
185 | if (ipv6_addr_is_multicast(&hdr->daddr) && |
186 | !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, | |
187 | &hdr->saddr) && | |
188 | !ipv6_is_mld(skb, nexthdr)) | |
189 | goto discard; | |
190 | } | |
191 | if (!(ipprot->flags & INET6_PROTO_NOPOLICY) && | |
1ab1457c | 192 | !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
1da177e4 | 193 | goto discard; |
1ab1457c | 194 | |
e5bbef20 | 195 | ret = ipprot->handler(skb); |
1da177e4 LT |
196 | if (ret > 0) |
197 | goto resubmit; | |
198 | else if (ret == 0) | |
a11d206d | 199 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS); |
1da177e4 | 200 | } else { |
69d6da0b | 201 | if (!raw) { |
1da177e4 | 202 | if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
a11d206d | 203 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INUNKNOWNPROTOS); |
fad87aca | 204 | icmpv6_send(skb, ICMPV6_PARAMPROB, |
1ab1457c YH |
205 | ICMPV6_UNK_NEXTHDR, nhoff, |
206 | skb->dev); | |
1da177e4 | 207 | } |
fad87aca | 208 | } else |
a11d206d | 209 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS); |
fad87aca | 210 | kfree_skb(skb); |
1da177e4 LT |
211 | } |
212 | rcu_read_unlock(); | |
213 | return 0; | |
214 | ||
215 | discard: | |
a11d206d | 216 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
217 | rcu_read_unlock(); |
218 | kfree_skb(skb); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | ||
223 | int ip6_input(struct sk_buff *skb) | |
224 | { | |
6e23ae2a PM |
225 | return NF_HOOK(PF_INET6, NF_INET_LOCAL_IN, skb, skb->dev, NULL, |
226 | ip6_input_finish); | |
1da177e4 LT |
227 | } |
228 | ||
229 | int ip6_mc_input(struct sk_buff *skb) | |
230 | { | |
231 | struct ipv6hdr *hdr; | |
232 | int deliver; | |
233 | ||
a11d206d | 234 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS); |
1da177e4 | 235 | |
0660e03f | 236 | hdr = ipv6_hdr(skb); |
4c7966b8 | 237 | deliver = ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL); |
1da177e4 LT |
238 | |
239 | /* | |
240 | * IPv6 multicast router mode isnt currently supported. | |
241 | */ | |
242 | #if 0 | |
243 | if (ipv6_config.multicast_route) { | |
244 | int addr_type; | |
245 | ||
246 | addr_type = ipv6_addr_type(&hdr->daddr); | |
247 | ||
248 | if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) { | |
249 | struct sk_buff *skb2; | |
250 | struct dst_entry *dst; | |
251 | ||
252 | dst = skb->dst; | |
1ab1457c | 253 | |
1da177e4 LT |
254 | if (deliver) { |
255 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
256 | dst_output(skb2); | |
257 | } else { | |
258 | dst_output(skb); | |
259 | return 0; | |
260 | } | |
261 | } | |
262 | } | |
263 | #endif | |
264 | ||
265 | if (likely(deliver)) { | |
266 | ip6_input(skb); | |
267 | return 0; | |
268 | } | |
269 | /* discard */ | |
270 | kfree_skb(skb); | |
271 | ||
272 | return 0; | |
273 | } |