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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [net/] [ipv6/] [ip6_input.c] - Blame information for rev 8

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Line No. Rev Author Line
1 3 xianfeng 
/*
2 
 *      IPv6 input
3 
 *      Linux INET6 implementation
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>
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 
 
50 
inline int ip6_rcv_finish( struct sk_buff *skb)
51 
{
52 
        if (skb->dst == NULL)
53 
                ip6_route_input(skb);
54 
 
55 
        return dst_input(skb);
56 
}
57 
 
58 
int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
59 
{
60 
        struct ipv6hdr *hdr;
61 
        u32             pkt_len;
62 
        struct inet6_dev *idev;
63 
 
64 
        if (dev->nd_net != &init_net) {
65 
                kfree_skb(skb);
66 
                return 0;
67 
        }
68 
 
69 
        if (skb->pkt_type == PACKET_OTHERHOST) {
70 
                kfree_skb(skb);
71 
                return 0;
72 
        }
73 
 
74 
        rcu_read_lock();
75 
 
76 
        idev = __in6_dev_get(skb->dev);
77 
 
78 
        IP6_INC_STATS_BH(idev, IPSTATS_MIB_INRECEIVES);
79 
 
80 
        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
81 
                IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS);
82 
                rcu_read_unlock();
83 
                goto out;
84 
        }
85 
 
86 
        memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
87 
 
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
94 
         * via the loopback interface (lo) here; skb->dev = loopback_dev.
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 
         */
99 
        IP6CB(skb)->iif = skb->dst ? ip6_dst_idev(skb->dst)->dev->ifindex : dev->ifindex;
100 
 
101 
        if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
102 
                goto err;
103 
 
104 
        hdr = ipv6_hdr(skb);
105 
 
106 
        if (hdr->version != 6)
107 
                goto err;
108 
 
109 
        skb->transport_header = skb->network_header + sizeof(*hdr);
110 
        IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
111 
 
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) {
116 
                if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
117 
                        IP6_INC_STATS_BH(idev, IPSTATS_MIB_INTRUNCATEDPKTS);
118 
                        goto drop;
119 
                }
120 
                if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
121 
                        IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
122 
                        goto drop;
123 
                }
124 
                hdr = ipv6_hdr(skb);
125 
        }
126 
 
127 
        if (hdr->nexthdr == NEXTHDR_HOP) {
128 
                if (ipv6_parse_hopopts(skb) < 0) {
129 
                        IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
130 
                        rcu_read_unlock();
131 
                        return 0;
132 
                }
133 
        }
134 
 
135 
        rcu_read_unlock();
136 
 
137 
        return NF_HOOK(PF_INET6,NF_IP6_PRE_ROUTING, skb, dev, NULL, ip6_rcv_finish);
138 
err:
139 
        IP6_INC_STATS_BH(idev, IPSTATS_MIB_INHDRERRORS);
140 
drop:
141 
        rcu_read_unlock();
142 
        kfree_skb(skb);
143 
out:
144 
        return 0;
145 
}
146 
 
147 
/*
148 
 *      Deliver the packet to the host
149 
 */
150 
 
151 
 
152 
static int ip6_input_finish(struct sk_buff *skb)
153 
{
154 
        struct inet6_protocol *ipprot;
155 
        struct sock *raw_sk;
156 
        unsigned int nhoff;
157 
        int nexthdr;
158 
        u8 hash;
159 
        struct inet6_dev *idev;
160 
 
161 
        /*
162 
         *      Parse extension headers
163 
         */
164 
 
165 
        rcu_read_lock();
166 
resubmit:
167 
        idev = ip6_dst_idev(skb->dst);
168 
        if (!pskb_pull(skb, skb_transport_offset(skb)))
169 
                goto discard;
170 
        nhoff = IP6CB(skb)->nhoff;
171 
        nexthdr = skb_network_header(skb)[nhoff];
172 
 
173 
        raw_sk = sk_head(&raw_v6_htable[nexthdr & (MAX_INET_PROTOS - 1)]);
174 
        if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
175 
                raw_sk = NULL;
176 
 
177 
        hash = nexthdr & (MAX_INET_PROTOS - 1);
178 
        if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) {
179 
                int ret;
180 
 
181 
                if (ipprot->flags & INET6_PROTO_FINAL) {
182 
                        struct ipv6hdr *hdr;
183 
 
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);
188 
 
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;
197 
                }
198 
                if (!(ipprot->flags & INET6_PROTO_NOPOLICY) &&
199 
                    !xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
200 
                        goto discard;
201 
 
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_sk) {
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);
214 
                        }
215 
                } else
216 
                        IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDELIVERS);
217 
                kfree_skb(skb);
218 
        }
219 
        rcu_read_unlock();
220 
        return 0;
221 
 
222 
discard:
223 
        IP6_INC_STATS_BH(idev, IPSTATS_MIB_INDISCARDS);
224 
        rcu_read_unlock();
225 
        kfree_skb(skb);
226 
        return 0;
227 
}
228 
 
229 
 
230 
int ip6_input(struct sk_buff *skb)
231 
{
232 
        return NF_HOOK(PF_INET6,NF_IP6_LOCAL_IN, skb, skb->dev, NULL, ip6_input_finish);
233 
}
234 
 
235 
int ip6_mc_input(struct sk_buff *skb)
236 
{
237 
        struct ipv6hdr *hdr;
238 
        int deliver;
239 
 
240 
        IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INMCASTPKTS);
241 
 
242 
        hdr = ipv6_hdr(skb);
243 
        deliver = unlikely(skb->dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) ||
244 
            ipv6_chk_mcast_addr(skb->dev, &hdr->daddr, NULL);
245 
 
246 
        /*
247 
         *      IPv6 multicast router mode isnt currently supported.
248 
         */
249 
#if 0
250 
        if (ipv6_config.multicast_route) {
251 
                int addr_type;
252 
 
253 
                addr_type = ipv6_addr_type(&hdr->daddr);
254 
 
255 
                if (!(addr_type & (IPV6_ADDR_LOOPBACK | IPV6_ADDR_LINKLOCAL))) {
256 
                        struct sk_buff *skb2;
257 
                        struct dst_entry *dst;
258 
 
259 
                        dst = skb->dst;
260 
 
261 
                        if (deliver) {
262 
                                skb2 = skb_clone(skb, GFP_ATOMIC);
263 
                                dst_output(skb2);
264 
                        } else {
265 
                                dst_output(skb);
266 
                                return 0;
267 
                        }
268 
                }
269 
        }
270 
#endif
271 
 
272 
        if (likely(deliver)) {
273 
                ip6_input(skb);
274 
                return 0;
275 
        }
276 
        /* discard */
277 
        kfree_skb(skb);
278 
 
279 
        return 0;
280 
}

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