Commit | Line | Data |
---|---|---|
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 | |
e730c155 EB |
64 | if (dev->nd_net != &init_net) { |
65 | kfree_skb(skb); | |
66 | return 0; | |
67 | } | |
68 | ||
a11d206d YH |
69 | if (skb->pkt_type == PACKET_OTHERHOST) { |
70 | kfree_skb(skb); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | rcu_read_lock(); | |
1da177e4 | 75 | |
a11d206d YH |
76 | idev = __in6_dev_get(skb->dev); |
77 | ||
78 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INRECEIVES); | |
1da177e4 LT |
79 | |
80 | if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { | |
a11d206d YH |
81 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS); |
82 | rcu_read_unlock(); | |
1da177e4 LT |
83 | goto out; |
84 | } | |
85 | ||
6b7fdc3a GC |
86 | memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm)); |
87 | ||
1da177e4 LT |
88 | /* |
89 | * Store incoming device index. When the packet will | |
90 | * be queued, we cannot refer to skb->dev anymore. | |
91 | * | |
92 | * BTW, when we send a packet for our own local address on a | |
93 | * non-loopback interface (e.g. ethX), it is being delivered | |
de3cb747 | 94 | * via the loopback interface (lo) here; skb->dev = loopback_dev. |
1da177e4 LT |
95 | * It, however, should be considered as if it is being |
96 | * arrived via the sending interface (ethX), because of the | |
97 | * nature of scoping architecture. --yoshfuji | |
98 | */ | |
7a3025b1 | 99 | IP6CB(skb)->iif = skb->dst ? ip6_dst_idev(skb->dst)->dev->ifindex : dev->ifindex; |
1da177e4 | 100 | |
2889139a | 101 | if (unlikely(!pskb_may_pull(skb, sizeof(*hdr)))) |
1da177e4 LT |
102 | goto err; |
103 | ||
0660e03f | 104 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
105 | |
106 | if (hdr->version != 6) | |
107 | goto err; | |
108 | ||
b0e380b1 | 109 | skb->transport_header = skb->network_header + sizeof(*hdr); |
951dbc8a PM |
110 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
111 | ||
1da177e4 LT |
112 | pkt_len = ntohs(hdr->payload_len); |
113 | ||
114 | /* pkt_len may be zero if Jumbo payload option is present */ | |
115 | if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) { | |
60e5c166 MC |
116 | if (pkt_len + sizeof(struct ipv6hdr) > skb->len) { |
117 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INTRUNCATEDPKTS); | |
118 | goto drop; | |
119 | } | |
1da177e4 | 120 | if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) { |
a11d206d | 121 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 LT |
122 | goto drop; |
123 | } | |
0660e03f | 124 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
125 | } |
126 | ||
127 | if (hdr->nexthdr == NEXTHDR_HOP) { | |
e5bbef20 | 128 | if (ipv6_parse_hopopts(skb) < 0) { |
a11d206d YH |
129 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
130 | rcu_read_unlock(); | |
1da177e4 LT |
131 | return 0; |
132 | } | |
1da177e4 LT |
133 | } |
134 | ||
a11d206d YH |
135 | rcu_read_unlock(); |
136 | ||
6e23ae2a PM |
137 | return NF_HOOK(PF_INET6, NF_INET_PRE_ROUTING, skb, dev, NULL, |
138 | ip6_rcv_finish); | |
1da177e4 | 139 | err: |
a11d206d | 140 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS); |
1da177e4 | 141 | drop: |
a11d206d | 142 | rcu_read_unlock(); |
1da177e4 LT |
143 | kfree_skb(skb); |
144 | out: | |
145 | return 0; | |
146 | } | |
147 | ||
148 | /* | |
149 | * Deliver the packet to the host | |
150 | */ | |
151 | ||
152 | ||
ad643a79 | 153 | static int ip6_input_finish(struct sk_buff *skb) |
1da177e4 LT |
154 | { |
155 | struct inet6_protocol *ipprot; | |
1da177e4 | 156 | unsigned int nhoff; |
69d6da0b | 157 | int nexthdr, raw; |
1da177e4 | 158 | u8 hash; |
a11d206d | 159 | struct inet6_dev *idev; |
1da177e4 | 160 | |
1da177e4 LT |
161 | /* |
162 | * Parse extension headers | |
163 | */ | |
164 | ||
1da177e4 LT |
165 | rcu_read_lock(); |
166 | resubmit: | |
a11d206d | 167 | idev = ip6_dst_idev(skb->dst); |
ea2ae17d | 168 | if (!pskb_pull(skb, skb_transport_offset(skb))) |
1da177e4 | 169 | goto discard; |
951dbc8a | 170 | nhoff = IP6CB(skb)->nhoff; |
d56f90a7 | 171 | nexthdr = skb_network_header(skb)[nhoff]; |
1da177e4 | 172 | |
69d6da0b | 173 | raw = raw6_local_deliver(skb, nexthdr); |
1da177e4 LT |
174 | |
175 | hash = nexthdr & (MAX_INET_PROTOS - 1); | |
176 | if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) { | |
177 | int ret; | |
1ab1457c | 178 | |
1da177e4 | 179 | if (ipprot->flags & INET6_PROTO_FINAL) { |
1ab1457c | 180 | struct ipv6hdr *hdr; |
1da177e4 | 181 | |
9fb9cbb1 YK |
182 | /* Free reference early: we don't need it any more, |
183 | and it may hold ip_conntrack module loaded | |
184 | indefinitely. */ | |
185 | nf_reset(skb); | |
186 | ||
d56f90a7 | 187 | skb_postpull_rcsum(skb, skb_network_header(skb), |
cfe1fc77 | 188 | skb_network_header_len(skb)); |
0660e03f | 189 | hdr = ipv6_hdr(skb); |
1da177e4 LT |
190 | if (ipv6_addr_is_multicast(&hdr->daddr) && |
191 | !ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, | |
192 | &hdr->saddr) && | |
193 | !ipv6_is_mld(skb, nexthdr)) | |
194 | goto discard; | |
195 | } | |
196 | if (!(ipprot->flags & INET6_PROTO_NOPOLICY) && | |
1ab1457c | 197 | !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
1da177e4 | 198 | goto discard; |
1ab1457c | 199 | |
e5bbef20 | 200 | ret = ipprot->handler(skb); |
1da177e4 LT |
201 | if (ret > 0) |
202 | goto resubmit; | |
203 | else if (ret == 0) | |
a11d206d | 204 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS); |
1da177e4 | 205 | } else { |
69d6da0b | 206 | if (!raw) { |
1da177e4 | 207 | if (xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
a11d206d | 208 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INUNKNOWNPROTOS); |
fad87aca | 209 | icmpv6_send(skb, ICMPV6_PARAMPROB, |
1ab1457c YH |
210 | ICMPV6_UNK_NEXTHDR, nhoff, |
211 | skb->dev); | |
1da177e4 | 212 | } |
fad87aca | 213 | } else |
a11d206d | 214 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS); |
fad87aca | 215 | kfree_skb(skb); |
1da177e4 LT |
216 | } |
217 | rcu_read_unlock(); | |
218 | return 0; | |
219 | ||
220 | discard: | |
a11d206d | 221 | IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS); |
1da177e4 LT |
222 | rcu_read_unlock(); |
223 | kfree_skb(skb); | |
224 | return 0; | |
225 | } | |
226 | ||
227 | ||
228 | int ip6_input(struct sk_buff *skb) | |
229 | { | |
6e23ae2a PM |
230 | return NF_HOOK(PF_INET6, NF_INET_LOCAL_IN, skb, skb->dev, NULL, |
231 | ip6_input_finish); | |
1da177e4 LT |
232 | } |
233 | ||
234 | int ip6_mc_input(struct sk_buff *skb) | |
235 | { | |
236 | struct ipv6hdr *hdr; | |
237 | int deliver; | |
238 | ||
a11d206d | 239 | IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS); |
1da177e4 | 240 | |
0660e03f | 241 | hdr = ipv6_hdr(skb); |
ae7bf20a | 242 | deliver = unlikely(skb->dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) || |
1da177e4 LT |
243 | ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL); |
244 | ||
245 | /* | |
246 | * IPv6 multicast router mode isnt currently supported. | |
247 | */ | |
248 | #if 0 | |
249 | if (ipv6_config.multicast_route) { | |
250 | int addr_type; | |
251 | ||
252 | addr_type = ipv6_addr_type(&hdr->daddr); | |
253 | ||
254 | if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) { | |
255 | struct sk_buff *skb2; | |
256 | struct dst_entry *dst; | |
257 | ||
258 | dst = skb->dst; | |
1ab1457c | 259 | |
1da177e4 LT |
260 | if (deliver) { |
261 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
262 | dst_output(skb2); | |
263 | } else { | |
264 | dst_output(skb); | |
265 | return 0; | |
266 | } | |
267 | } | |
268 | } | |
269 | #endif | |
270 | ||
271 | if (likely(deliver)) { | |
272 | ip6_input(skb); | |
273 | return 0; | |
274 | } | |
275 | /* discard */ | |
276 | kfree_skb(skb); | |
277 | ||
278 | return 0; | |
279 | } |