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Linux/net/ipv6/ip6_input.c

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  1 /*
  2  *      IPv6 input
  3  *      Linux INET6 implementation 
  4  *
  5  *      Authors:
  6  *      Pedro Roque             <pedro_m@yahoo.com>
  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 
 19 #include <linux/errno.h>
 20 #include <linux/types.h>
 21 #include <linux/socket.h>
 22 #include <linux/sockios.h>
 23 #include <linux/sched.h>
 24 #include <linux/net.h>
 25 #include <linux/netdevice.h>
 26 #include <linux/in6.h>
 27 #include <linux/icmpv6.h>
 28 
 29 #include <linux/netfilter.h>
 30 #include <linux/netfilter_ipv6.h>
 31 
 32 #include <net/sock.h>
 33 #include <net/snmp.h>
 34 
 35 #include <net/ipv6.h>
 36 #include <net/protocol.h>
 37 #include <net/transp_v6.h>
 38 #include <net/rawv6.h>
 39 #include <net/ndisc.h>
 40 #include <net/ip6_route.h>
 41 #include <net/addrconf.h>
 42 
 43 
 44 
 45 static inline int ip6_rcv_finish( struct sk_buff *skb) 
 46 {
 47         if (skb->dst == NULL)
 48                 ip6_route_input(skb);
 49 
 50         return skb->dst->input(skb);
 51 }
 52 
 53 int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt)
 54 {
 55         struct ipv6hdr *hdr;
 56         u32             pkt_len;
 57 
 58         if (skb->pkt_type == PACKET_OTHERHOST)
 59                 goto drop;
 60 
 61         IP6_INC_STATS_BH(Ip6InReceives);
 62 
 63         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
 64                 goto out;
 65 
 66         /* Store incoming device index. When the packet will
 67            be queued, we cannot refer to skb->dev anymore.
 68          */
 69         ((struct inet6_skb_parm *)skb->cb)->iif = dev->ifindex;
 70 
 71         if (skb->len < sizeof(struct ipv6hdr))
 72                 goto err;
 73 
 74         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
 75                 goto drop;
 76 
 77         hdr = skb->nh.ipv6h;
 78 
 79         if (hdr->version != 6)
 80                 goto err;
 81 
 82         pkt_len = ntohs(hdr->payload_len);
 83 
 84         /* pkt_len may be zero if Jumbo payload option is present */
 85         if (pkt_len || hdr->nexthdr != NEXTHDR_HOP) {
 86                 if (pkt_len + sizeof(struct ipv6hdr) > skb->len)
 87                         goto truncated;
 88                 if (pkt_len + sizeof(struct ipv6hdr) < skb->len) {
 89                         if (__pskb_trim(skb, pkt_len + sizeof(struct ipv6hdr)))
 90                                 goto drop;
 91                         hdr = skb->nh.ipv6h;
 92                         if (skb->ip_summed == CHECKSUM_HW)
 93                                 skb->ip_summed = CHECKSUM_NONE;
 94                 }
 95         }
 96 
 97         if (hdr->nexthdr == NEXTHDR_HOP) {
 98                 skb->h.raw = (u8*)(hdr+1);
 99                 if (ipv6_parse_hopopts(skb, offsetof(struct ipv6hdr, nexthdr)) < 0) {
100                         IP6_INC_STATS_BH(Ip6InHdrErrors);
101                         return 0;
102                 }
103                 hdr = skb->nh.ipv6h;
104         }
105 
106         return NF_HOOK(PF_INET6,NF_IP6_PRE_ROUTING, skb, dev, NULL, ip6_rcv_finish);
107 truncated:
108         IP6_INC_STATS_BH(Ip6InTruncatedPkts);
109 err:
110         IP6_INC_STATS_BH(Ip6InHdrErrors);
111 drop:
112         kfree_skb(skb);
113 out:
114         return 0;
115 }
116 
117 /*
118  *      Deliver the packet to the host
119  */
120 
121 
122 static inline int ip6_input_finish(struct sk_buff *skb)
123 {
124         struct ipv6hdr *hdr = skb->nh.ipv6h;
125         struct inet6_protocol *ipprot;
126         struct sock *raw_sk;
127         int nhoff;
128         int nexthdr;
129         int found = 0;
130         u8 hash;
131 
132         skb->h.raw = skb->nh.raw + sizeof(struct ipv6hdr);
133 
134         /*
135          *      Parse extension headers
136          */
137 
138         nexthdr = hdr->nexthdr;
139         nhoff = offsetof(struct ipv6hdr, nexthdr);
140 
141         /* Skip  hop-by-hop options, they are already parsed. */
142         if (nexthdr == NEXTHDR_HOP) {
143                 nhoff = sizeof(struct ipv6hdr);
144                 nexthdr = skb->h.raw[0];
145                 skb->h.raw += (skb->h.raw[1]+1)<<3;
146         }
147 
148         /* This check is sort of optimization.
149            It would be stupid to detect for optional headers,
150            which are missing with probability of 200%
151          */
152         if (nexthdr != IPPROTO_TCP && nexthdr != IPPROTO_UDP) {
153                 nhoff = ipv6_parse_exthdrs(&skb, nhoff);
154                 if (nhoff < 0)
155                         return 0;
156                 nexthdr = skb->nh.raw[nhoff];
157                 hdr = skb->nh.ipv6h;
158         }
159 
160         if (!pskb_pull(skb, skb->h.raw - skb->data))
161                 goto discard;
162 
163         if (skb->ip_summed == CHECKSUM_HW)
164                 skb->csum = csum_sub(skb->csum,
165                                      csum_partial(skb->nh.raw, skb->h.raw-skb->nh.raw, 0));
166 
167         raw_sk = raw_v6_htable[nexthdr&(MAX_INET_PROTOS-1)];
168         if (raw_sk)
169                 raw_sk = ipv6_raw_deliver(skb, nexthdr);
170 
171         hash = nexthdr & (MAX_INET_PROTOS - 1);
172         for (ipprot = (struct inet6_protocol *) inet6_protos[hash]; 
173              ipprot != NULL; 
174              ipprot = (struct inet6_protocol *) ipprot->next) {
175                 struct sk_buff *buff = skb;
176 
177                 if (ipprot->protocol != nexthdr)
178                         continue;
179 
180                 if (ipprot->copy || raw_sk)
181                         buff = skb_clone(skb, GFP_ATOMIC);
182 
183                 if (buff)
184                         ipprot->handler(buff);
185                 found = 1;
186         }
187 
188         if (raw_sk) {
189                 rawv6_rcv(raw_sk, skb);
190                 sock_put(raw_sk);
191                 found = 1;
192         }
193 
194         /*
195          *      not found: send ICMP parameter problem back
196          */
197         if (!found) {
198                 IP6_INC_STATS_BH(Ip6InUnknownProtos);
199                 icmpv6_param_prob(skb, ICMPV6_UNK_NEXTHDR, nhoff);
200         }
201 
202         return 0;
203 
204 discard:
205         kfree_skb(skb);
206         return 0;
207 }
208 
209 
210 int ip6_input(struct sk_buff *skb)
211 {
212         return NF_HOOK(PF_INET6,NF_IP6_LOCAL_IN, skb, skb->dev, NULL, ip6_input_finish);
213 }
214 
215 int ip6_mc_input(struct sk_buff *skb)
216 {
217         struct ipv6hdr *hdr;    
218         int deliver = 0;
219         int discard = 1;
220 
221         IP6_INC_STATS_BH(Ip6InMcastPkts);
222 
223         hdr = skb->nh.ipv6h;
224         if (ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, &hdr->saddr))
225                 deliver = 1;
226 
227         /*
228          *      IPv6 multicast router mode isnt currently supported.
229          */
230 #if 0
231         if (ipv6_config.multicast_route) {
232                 int addr_type;
233 
234                 addr_type = ipv6_addr_type(&hdr->daddr);
235 
236                 if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) {
237                         struct sk_buff *skb2;
238                         struct dst_entry *dst;
239 
240                         dst = skb->dst;
241                         
242                         if (deliver) {
243                                 skb2 = skb_clone(skb, GFP_ATOMIC);
244                         } else {
245                                 discard = 0;
246                                 skb2 = skb;
247                         }
248 
249                         dst->output(skb2);
250                 }
251         }
252 #endif
253 
254         if (deliver) {
255                 discard = 0;
256                 ip6_input(skb);
257         }
258 
259         if (discard)
260                 kfree_skb(skb);
261 
262         return 0;
263 }
264 

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