| 1 |
1275 |
phoenix |
/*
|
| 2 |
|
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* IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
|
| 3 |
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* Linux INET6 implementation
|
| 4 |
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*
|
| 5 |
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* Authors:
|
| 6 |
|
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* Pedro Roque <roque@di.fc.ul.pt>
|
| 7 |
|
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
|
| 8 |
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*
|
| 9 |
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* $Id: sit.c,v 1.1.1.1 2004-04-15 01:14:34 phoenix Exp $
|
| 10 |
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*
|
| 11 |
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* This program is free software; you can redistribute it and/or
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| 12 |
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* modify it under the terms of the GNU General Public License
|
| 13 |
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* as published by the Free Software Foundation; either version
|
| 14 |
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* 2 of the License, or (at your option) any later version.
|
| 15 |
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*
|
| 16 |
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* Changes:
|
| 17 |
|
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* Roger Venning <r.venning@telstra.com>: 6to4 support
|
| 18 |
|
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* Nate Thompson <nate@thebog.net>: 6to4 support
|
| 19 |
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*/
|
| 20 |
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| 21 |
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#include <linux/config.h>
|
| 22 |
|
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#include <linux/module.h>
|
| 23 |
|
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#include <linux/errno.h>
|
| 24 |
|
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#include <linux/types.h>
|
| 25 |
|
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#include <linux/socket.h>
|
| 26 |
|
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#include <linux/sockios.h>
|
| 27 |
|
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#include <linux/sched.h>
|
| 28 |
|
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#include <linux/net.h>
|
| 29 |
|
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#include <linux/in6.h>
|
| 30 |
|
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#include <linux/netdevice.h>
|
| 31 |
|
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#include <linux/if_arp.h>
|
| 32 |
|
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#include <linux/icmp.h>
|
| 33 |
|
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#include <asm/uaccess.h>
|
| 34 |
|
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#include <linux/init.h>
|
| 35 |
|
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#include <linux/netfilter_ipv4.h>
|
| 36 |
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|
| 37 |
|
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#include <net/sock.h>
|
| 38 |
|
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#include <net/snmp.h>
|
| 39 |
|
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|
| 40 |
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#include <net/ipv6.h>
|
| 41 |
|
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#include <net/protocol.h>
|
| 42 |
|
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#include <net/transp_v6.h>
|
| 43 |
|
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#include <net/ip6_fib.h>
|
| 44 |
|
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#include <net/ip6_route.h>
|
| 45 |
|
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#include <net/ndisc.h>
|
| 46 |
|
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#include <net/addrconf.h>
|
| 47 |
|
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#include <net/ip.h>
|
| 48 |
|
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#include <net/udp.h>
|
| 49 |
|
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#include <net/icmp.h>
|
| 50 |
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#include <net/ipip.h>
|
| 51 |
|
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#include <net/inet_ecn.h>
|
| 52 |
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|
| 53 |
|
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/*
|
| 54 |
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This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
|
| 55 |
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|
| 56 |
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For comments look at net/ipv4/ip_gre.c --ANK
|
| 57 |
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*/
|
| 58 |
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|
| 59 |
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#define HASH_SIZE 16
|
| 60 |
|
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#define HASH(addr) ((addr^(addr>>4))&0xF)
|
| 61 |
|
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|
| 62 |
|
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static int ipip6_fb_tunnel_init(struct net_device *dev);
|
| 63 |
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static int ipip6_tunnel_init(struct net_device *dev);
|
| 64 |
|
|
|
| 65 |
|
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static struct net_device ipip6_fb_tunnel_dev = {
|
| 66 |
|
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name: "sit0",
|
| 67 |
|
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init: ipip6_fb_tunnel_init,
|
| 68 |
|
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};
|
| 69 |
|
|
|
| 70 |
|
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static struct ip_tunnel ipip6_fb_tunnel = {
|
| 71 |
|
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NULL, &ipip6_fb_tunnel_dev, {0, }, 0, 0, 0, 0, 0, 0, 0, {"sit0", }
|
| 72 |
|
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};
|
| 73 |
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|
|
| 74 |
|
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static struct ip_tunnel *tunnels_r_l[HASH_SIZE];
|
| 75 |
|
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static struct ip_tunnel *tunnels_r[HASH_SIZE];
|
| 76 |
|
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static struct ip_tunnel *tunnels_l[HASH_SIZE];
|
| 77 |
|
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static struct ip_tunnel *tunnels_wc[1];
|
| 78 |
|
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static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l };
|
| 79 |
|
|
|
| 80 |
|
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static rwlock_t ipip6_lock = RW_LOCK_UNLOCKED;
|
| 81 |
|
|
|
| 82 |
|
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static struct ip_tunnel * ipip6_tunnel_lookup(u32 remote, u32 local)
|
| 83 |
|
|
{
|
| 84 |
|
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unsigned h0 = HASH(remote);
|
| 85 |
|
|
unsigned h1 = HASH(local);
|
| 86 |
|
|
struct ip_tunnel *t;
|
| 87 |
|
|
|
| 88 |
|
|
for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
|
| 89 |
|
|
if (local == t->parms.iph.saddr &&
|
| 90 |
|
|
remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
|
| 91 |
|
|
return t;
|
| 92 |
|
|
}
|
| 93 |
|
|
for (t = tunnels_r[h0]; t; t = t->next) {
|
| 94 |
|
|
if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
|
| 95 |
|
|
return t;
|
| 96 |
|
|
}
|
| 97 |
|
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for (t = tunnels_l[h1]; t; t = t->next) {
|
| 98 |
|
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if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
|
| 99 |
|
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return t;
|
| 100 |
|
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}
|
| 101 |
|
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if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
|
| 102 |
|
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return t;
|
| 103 |
|
|
return NULL;
|
| 104 |
|
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}
|
| 105 |
|
|
|
| 106 |
|
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static struct ip_tunnel ** ipip6_bucket(struct ip_tunnel *t)
|
| 107 |
|
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{
|
| 108 |
|
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u32 remote = t->parms.iph.daddr;
|
| 109 |
|
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u32 local = t->parms.iph.saddr;
|
| 110 |
|
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unsigned h = 0;
|
| 111 |
|
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int prio = 0;
|
| 112 |
|
|
|
| 113 |
|
|
if (remote) {
|
| 114 |
|
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prio |= 2;
|
| 115 |
|
|
h ^= HASH(remote);
|
| 116 |
|
|
}
|
| 117 |
|
|
if (local) {
|
| 118 |
|
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prio |= 1;
|
| 119 |
|
|
h ^= HASH(local);
|
| 120 |
|
|
}
|
| 121 |
|
|
return &tunnels[prio][h];
|
| 122 |
|
|
}
|
| 123 |
|
|
|
| 124 |
|
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static void ipip6_tunnel_unlink(struct ip_tunnel *t)
|
| 125 |
|
|
{
|
| 126 |
|
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struct ip_tunnel **tp;
|
| 127 |
|
|
|
| 128 |
|
|
for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) {
|
| 129 |
|
|
if (t == *tp) {
|
| 130 |
|
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write_lock_bh(&ipip6_lock);
|
| 131 |
|
|
*tp = t->next;
|
| 132 |
|
|
write_unlock_bh(&ipip6_lock);
|
| 133 |
|
|
break;
|
| 134 |
|
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}
|
| 135 |
|
|
}
|
| 136 |
|
|
}
|
| 137 |
|
|
|
| 138 |
|
|
static void ipip6_tunnel_link(struct ip_tunnel *t)
|
| 139 |
|
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{
|
| 140 |
|
|
struct ip_tunnel **tp = ipip6_bucket(t);
|
| 141 |
|
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|
| 142 |
|
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write_lock_bh(&ipip6_lock);
|
| 143 |
|
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t->next = *tp;
|
| 144 |
|
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write_unlock_bh(&ipip6_lock);
|
| 145 |
|
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*tp = t;
|
| 146 |
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}
|
| 147 |
|
|
|
| 148 |
|
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struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create)
|
| 149 |
|
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{
|
| 150 |
|
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u32 remote = parms->iph.daddr;
|
| 151 |
|
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u32 local = parms->iph.saddr;
|
| 152 |
|
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struct ip_tunnel *t, **tp, *nt;
|
| 153 |
|
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struct net_device *dev;
|
| 154 |
|
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unsigned h = 0;
|
| 155 |
|
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int prio = 0;
|
| 156 |
|
|
|
| 157 |
|
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if (remote) {
|
| 158 |
|
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prio |= 2;
|
| 159 |
|
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h ^= HASH(remote);
|
| 160 |
|
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}
|
| 161 |
|
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if (local) {
|
| 162 |
|
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prio |= 1;
|
| 163 |
|
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h ^= HASH(local);
|
| 164 |
|
|
}
|
| 165 |
|
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for (tp = &tunnels[prio][h]; (t = *tp) != NULL; tp = &t->next) {
|
| 166 |
|
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if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
|
| 167 |
|
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return t;
|
| 168 |
|
|
}
|
| 169 |
|
|
if (!create)
|
| 170 |
|
|
return NULL;
|
| 171 |
|
|
|
| 172 |
|
|
MOD_INC_USE_COUNT;
|
| 173 |
|
|
dev = kmalloc(sizeof(*dev) + sizeof(*t), GFP_KERNEL);
|
| 174 |
|
|
if (dev == NULL) {
|
| 175 |
|
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MOD_DEC_USE_COUNT;
|
| 176 |
|
|
return NULL;
|
| 177 |
|
|
}
|
| 178 |
|
|
memset(dev, 0, sizeof(*dev) + sizeof(*t));
|
| 179 |
|
|
dev->priv = (void*)(dev+1);
|
| 180 |
|
|
nt = (struct ip_tunnel*)dev->priv;
|
| 181 |
|
|
nt->dev = dev;
|
| 182 |
|
|
dev->init = ipip6_tunnel_init;
|
| 183 |
|
|
dev->features |= NETIF_F_DYNALLOC;
|
| 184 |
|
|
memcpy(&nt->parms, parms, sizeof(*parms));
|
| 185 |
|
|
nt->parms.name[IFNAMSIZ-1] = '\0';
|
| 186 |
|
|
strcpy(dev->name, nt->parms.name);
|
| 187 |
|
|
if (dev->name[0] == 0) {
|
| 188 |
|
|
int i;
|
| 189 |
|
|
for (i=1; i<100; i++) {
|
| 190 |
|
|
sprintf(dev->name, "sit%d", i);
|
| 191 |
|
|
if (__dev_get_by_name(dev->name) == NULL)
|
| 192 |
|
|
break;
|
| 193 |
|
|
}
|
| 194 |
|
|
if (i==100)
|
| 195 |
|
|
goto failed;
|
| 196 |
|
|
memcpy(nt->parms.name, dev->name, IFNAMSIZ);
|
| 197 |
|
|
}
|
| 198 |
|
|
if (register_netdevice(dev) < 0)
|
| 199 |
|
|
goto failed;
|
| 200 |
|
|
|
| 201 |
|
|
dev_hold(dev);
|
| 202 |
|
|
ipip6_tunnel_link(nt);
|
| 203 |
|
|
/* Do not decrement MOD_USE_COUNT here. */
|
| 204 |
|
|
return nt;
|
| 205 |
|
|
|
| 206 |
|
|
failed:
|
| 207 |
|
|
kfree(dev);
|
| 208 |
|
|
MOD_DEC_USE_COUNT;
|
| 209 |
|
|
return NULL;
|
| 210 |
|
|
}
|
| 211 |
|
|
|
| 212 |
|
|
static void ipip6_tunnel_destructor(struct net_device *dev)
|
| 213 |
|
|
{
|
| 214 |
|
|
if (dev != &ipip6_fb_tunnel_dev) {
|
| 215 |
|
|
MOD_DEC_USE_COUNT;
|
| 216 |
|
|
}
|
| 217 |
|
|
}
|
| 218 |
|
|
|
| 219 |
|
|
static void ipip6_tunnel_uninit(struct net_device *dev)
|
| 220 |
|
|
{
|
| 221 |
|
|
if (dev == &ipip6_fb_tunnel_dev) {
|
| 222 |
|
|
write_lock_bh(&ipip6_lock);
|
| 223 |
|
|
tunnels_wc[0] = NULL;
|
| 224 |
|
|
write_unlock_bh(&ipip6_lock);
|
| 225 |
|
|
dev_put(dev);
|
| 226 |
|
|
} else {
|
| 227 |
|
|
ipip6_tunnel_unlink((struct ip_tunnel*)dev->priv);
|
| 228 |
|
|
dev_put(dev);
|
| 229 |
|
|
}
|
| 230 |
|
|
}
|
| 231 |
|
|
|
| 232 |
|
|
|
| 233 |
|
|
void ipip6_err(struct sk_buff *skb, u32 info)
|
| 234 |
|
|
{
|
| 235 |
|
|
#ifndef I_WISH_WORLD_WERE_PERFECT
|
| 236 |
|
|
|
| 237 |
|
|
/* It is not :-( All the routers (except for Linux) return only
|
| 238 |
|
|
8 bytes of packet payload. It means, that precise relaying of
|
| 239 |
|
|
ICMP in the real Internet is absolutely infeasible.
|
| 240 |
|
|
*/
|
| 241 |
|
|
struct iphdr *iph = (struct iphdr*)skb->data;
|
| 242 |
|
|
int type = skb->h.icmph->type;
|
| 243 |
|
|
int code = skb->h.icmph->code;
|
| 244 |
|
|
struct ip_tunnel *t;
|
| 245 |
|
|
|
| 246 |
|
|
switch (type) {
|
| 247 |
|
|
default:
|
| 248 |
|
|
case ICMP_PARAMETERPROB:
|
| 249 |
|
|
return;
|
| 250 |
|
|
|
| 251 |
|
|
case ICMP_DEST_UNREACH:
|
| 252 |
|
|
switch (code) {
|
| 253 |
|
|
case ICMP_SR_FAILED:
|
| 254 |
|
|
case ICMP_PORT_UNREACH:
|
| 255 |
|
|
/* Impossible event. */
|
| 256 |
|
|
return;
|
| 257 |
|
|
case ICMP_FRAG_NEEDED:
|
| 258 |
|
|
/* Soft state for pmtu is maintained by IP core. */
|
| 259 |
|
|
return;
|
| 260 |
|
|
default:
|
| 261 |
|
|
/* All others are translated to HOST_UNREACH.
|
| 262 |
|
|
rfc2003 contains "deep thoughts" about NET_UNREACH,
|
| 263 |
|
|
I believe they are just ether pollution. --ANK
|
| 264 |
|
|
*/
|
| 265 |
|
|
break;
|
| 266 |
|
|
}
|
| 267 |
|
|
break;
|
| 268 |
|
|
case ICMP_TIME_EXCEEDED:
|
| 269 |
|
|
if (code != ICMP_EXC_TTL)
|
| 270 |
|
|
return;
|
| 271 |
|
|
break;
|
| 272 |
|
|
}
|
| 273 |
|
|
|
| 274 |
|
|
read_lock(&ipip6_lock);
|
| 275 |
|
|
t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
|
| 276 |
|
|
if (t == NULL || t->parms.iph.daddr == 0)
|
| 277 |
|
|
goto out;
|
| 278 |
|
|
if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
|
| 279 |
|
|
goto out;
|
| 280 |
|
|
|
| 281 |
|
|
if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
|
| 282 |
|
|
t->err_count++;
|
| 283 |
|
|
else
|
| 284 |
|
|
t->err_count = 1;
|
| 285 |
|
|
t->err_time = jiffies;
|
| 286 |
|
|
out:
|
| 287 |
|
|
read_unlock(&ipip6_lock);
|
| 288 |
|
|
return;
|
| 289 |
|
|
#else
|
| 290 |
|
|
struct iphdr *iph = (struct iphdr*)dp;
|
| 291 |
|
|
int hlen = iph->ihl<<2;
|
| 292 |
|
|
struct ipv6hdr *iph6;
|
| 293 |
|
|
int type = skb->h.icmph->type;
|
| 294 |
|
|
int code = skb->h.icmph->code;
|
| 295 |
|
|
int rel_type = 0;
|
| 296 |
|
|
int rel_code = 0;
|
| 297 |
|
|
int rel_info = 0;
|
| 298 |
|
|
struct sk_buff *skb2;
|
| 299 |
|
|
struct rt6_info *rt6i;
|
| 300 |
|
|
|
| 301 |
|
|
if (len < hlen + sizeof(struct ipv6hdr))
|
| 302 |
|
|
return;
|
| 303 |
|
|
iph6 = (struct ipv6hdr*)(dp + hlen);
|
| 304 |
|
|
|
| 305 |
|
|
switch (type) {
|
| 306 |
|
|
default:
|
| 307 |
|
|
return;
|
| 308 |
|
|
case ICMP_PARAMETERPROB:
|
| 309 |
|
|
if (skb->h.icmph->un.gateway < hlen)
|
| 310 |
|
|
return;
|
| 311 |
|
|
|
| 312 |
|
|
/* So... This guy found something strange INSIDE encapsulated
|
| 313 |
|
|
packet. Well, he is fool, but what can we do ?
|
| 314 |
|
|
*/
|
| 315 |
|
|
rel_type = ICMPV6_PARAMPROB;
|
| 316 |
|
|
rel_info = skb->h.icmph->un.gateway - hlen;
|
| 317 |
|
|
break;
|
| 318 |
|
|
|
| 319 |
|
|
case ICMP_DEST_UNREACH:
|
| 320 |
|
|
switch (code) {
|
| 321 |
|
|
case ICMP_SR_FAILED:
|
| 322 |
|
|
case ICMP_PORT_UNREACH:
|
| 323 |
|
|
/* Impossible event. */
|
| 324 |
|
|
return;
|
| 325 |
|
|
case ICMP_FRAG_NEEDED:
|
| 326 |
|
|
/* Too complicated case ... */
|
| 327 |
|
|
return;
|
| 328 |
|
|
default:
|
| 329 |
|
|
/* All others are translated to HOST_UNREACH.
|
| 330 |
|
|
rfc2003 contains "deep thoughts" about NET_UNREACH,
|
| 331 |
|
|
I believe, it is just ether pollution. --ANK
|
| 332 |
|
|
*/
|
| 333 |
|
|
rel_type = ICMPV6_DEST_UNREACH;
|
| 334 |
|
|
rel_code = ICMPV6_ADDR_UNREACH;
|
| 335 |
|
|
break;
|
| 336 |
|
|
}
|
| 337 |
|
|
break;
|
| 338 |
|
|
case ICMP_TIME_EXCEEDED:
|
| 339 |
|
|
if (code != ICMP_EXC_TTL)
|
| 340 |
|
|
return;
|
| 341 |
|
|
rel_type = ICMPV6_TIME_EXCEED;
|
| 342 |
|
|
rel_code = ICMPV6_EXC_HOPLIMIT;
|
| 343 |
|
|
break;
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
/* Prepare fake skb to feed it to icmpv6_send */
|
| 347 |
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
| 348 |
|
|
if (skb2 == NULL)
|
| 349 |
|
|
return;
|
| 350 |
|
|
dst_release(skb2->dst);
|
| 351 |
|
|
skb2->dst = NULL;
|
| 352 |
|
|
skb_pull(skb2, skb->data - (u8*)iph6);
|
| 353 |
|
|
skb2->nh.raw = skb2->data;
|
| 354 |
|
|
|
| 355 |
|
|
/* Try to guess incoming interface */
|
| 356 |
|
|
rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0);
|
| 357 |
|
|
if (rt6i && rt6i->rt6i_dev) {
|
| 358 |
|
|
skb2->dev = rt6i->rt6i_dev;
|
| 359 |
|
|
|
| 360 |
|
|
rt6i = rt6_lookup(&iph6->daddr, &iph6->saddr, NULL, 0);
|
| 361 |
|
|
|
| 362 |
|
|
if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
|
| 363 |
|
|
struct ip_tunnel * t = (struct ip_tunnel*)rt6i->rt6i_dev->priv;
|
| 364 |
|
|
if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
|
| 365 |
|
|
rel_type = ICMPV6_DEST_UNREACH;
|
| 366 |
|
|
rel_code = ICMPV6_ADDR_UNREACH;
|
| 367 |
|
|
}
|
| 368 |
|
|
icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
|
| 369 |
|
|
}
|
| 370 |
|
|
}
|
| 371 |
|
|
kfree_skb(skb2);
|
| 372 |
|
|
return;
|
| 373 |
|
|
#endif
|
| 374 |
|
|
}
|
| 375 |
|
|
|
| 376 |
|
|
static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
|
| 377 |
|
|
{
|
| 378 |
|
|
if (INET_ECN_is_ce(iph->tos) &&
|
| 379 |
|
|
INET_ECN_is_not_ce(ip6_get_dsfield(skb->nh.ipv6h)))
|
| 380 |
|
|
IP6_ECN_set_ce(skb->nh.ipv6h);
|
| 381 |
|
|
}
|
| 382 |
|
|
|
| 383 |
|
|
int ipip6_rcv(struct sk_buff *skb)
|
| 384 |
|
|
{
|
| 385 |
|
|
struct iphdr *iph;
|
| 386 |
|
|
struct ip_tunnel *tunnel;
|
| 387 |
|
|
|
| 388 |
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
| 389 |
|
|
goto out;
|
| 390 |
|
|
|
| 391 |
|
|
iph = skb->nh.iph;
|
| 392 |
|
|
|
| 393 |
|
|
read_lock(&ipip6_lock);
|
| 394 |
|
|
if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
|
| 395 |
|
|
skb->mac.raw = skb->nh.raw;
|
| 396 |
|
|
skb->nh.raw = skb->data;
|
| 397 |
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
|
| 398 |
|
|
skb->protocol = htons(ETH_P_IPV6);
|
| 399 |
|
|
skb->pkt_type = PACKET_HOST;
|
| 400 |
|
|
tunnel->stat.rx_packets++;
|
| 401 |
|
|
tunnel->stat.rx_bytes += skb->len;
|
| 402 |
|
|
skb->dev = tunnel->dev;
|
| 403 |
|
|
dst_release(skb->dst);
|
| 404 |
|
|
skb->dst = NULL;
|
| 405 |
|
|
#ifdef CONFIG_NETFILTER
|
| 406 |
|
|
nf_conntrack_put(skb->nfct);
|
| 407 |
|
|
skb->nfct = NULL;
|
| 408 |
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
| 409 |
|
|
skb->nf_debug = 0;
|
| 410 |
|
|
#endif
|
| 411 |
|
|
#endif
|
| 412 |
|
|
ipip6_ecn_decapsulate(iph, skb);
|
| 413 |
|
|
netif_rx(skb);
|
| 414 |
|
|
read_unlock(&ipip6_lock);
|
| 415 |
|
|
return 0;
|
| 416 |
|
|
}
|
| 417 |
|
|
|
| 418 |
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0);
|
| 419 |
|
|
kfree_skb(skb);
|
| 420 |
|
|
read_unlock(&ipip6_lock);
|
| 421 |
|
|
out:
|
| 422 |
|
|
return 0;
|
| 423 |
|
|
}
|
| 424 |
|
|
|
| 425 |
|
|
/* Need this wrapper because NF_HOOK takes the function address */
|
| 426 |
|
|
static inline int do_ip_send(struct sk_buff *skb)
|
| 427 |
|
|
{
|
| 428 |
|
|
return ip_send(skb);
|
| 429 |
|
|
}
|
| 430 |
|
|
|
| 431 |
|
|
|
| 432 |
|
|
/* Returns the embedded IPv4 address if the IPv6 address
|
| 433 |
|
|
comes from 6to4 (draft-ietf-ngtrans-6to4-04) addr space */
|
| 434 |
|
|
|
| 435 |
|
|
static inline u32 try_6to4(struct in6_addr *v6dst)
|
| 436 |
|
|
{
|
| 437 |
|
|
u32 dst = 0;
|
| 438 |
|
|
|
| 439 |
|
|
if (v6dst->s6_addr16[0] == htons(0x2002)) {
|
| 440 |
|
|
/* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
|
| 441 |
|
|
memcpy(&dst, &v6dst->s6_addr16[1], 4);
|
| 442 |
|
|
}
|
| 443 |
|
|
return dst;
|
| 444 |
|
|
}
|
| 445 |
|
|
|
| 446 |
|
|
/*
|
| 447 |
|
|
* This function assumes it is being called from dev_queue_xmit()
|
| 448 |
|
|
* and that skb is filled properly by that function.
|
| 449 |
|
|
*/
|
| 450 |
|
|
|
| 451 |
|
|
static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
|
| 452 |
|
|
{
|
| 453 |
|
|
struct ip_tunnel *tunnel = (struct ip_tunnel*)dev->priv;
|
| 454 |
|
|
struct net_device_stats *stats = &tunnel->stat;
|
| 455 |
|
|
struct iphdr *tiph = &tunnel->parms.iph;
|
| 456 |
|
|
struct ipv6hdr *iph6 = skb->nh.ipv6h;
|
| 457 |
|
|
u8 tos = tunnel->parms.iph.tos;
|
| 458 |
|
|
struct rtable *rt; /* Route to the other host */
|
| 459 |
|
|
struct net_device *tdev; /* Device to other host */
|
| 460 |
|
|
struct iphdr *iph; /* Our new IP header */
|
| 461 |
|
|
int max_headroom; /* The extra header space needed */
|
| 462 |
|
|
u32 dst = tiph->daddr;
|
| 463 |
|
|
int mtu;
|
| 464 |
|
|
struct in6_addr *addr6;
|
| 465 |
|
|
int addr_type;
|
| 466 |
|
|
|
| 467 |
|
|
if (tunnel->recursion++) {
|
| 468 |
|
|
tunnel->stat.collisions++;
|
| 469 |
|
|
goto tx_error;
|
| 470 |
|
|
}
|
| 471 |
|
|
|
| 472 |
|
|
if (skb->protocol != htons(ETH_P_IPV6))
|
| 473 |
|
|
goto tx_error;
|
| 474 |
|
|
|
| 475 |
|
|
if (!dst)
|
| 476 |
|
|
dst = try_6to4(&iph6->daddr);
|
| 477 |
|
|
|
| 478 |
|
|
if (!dst) {
|
| 479 |
|
|
struct neighbour *neigh = NULL;
|
| 480 |
|
|
|
| 481 |
|
|
if (skb->dst)
|
| 482 |
|
|
neigh = skb->dst->neighbour;
|
| 483 |
|
|
|
| 484 |
|
|
if (neigh == NULL) {
|
| 485 |
|
|
if (net_ratelimit())
|
| 486 |
|
|
printk(KERN_DEBUG "sit: nexthop == NULL\n");
|
| 487 |
|
|
goto tx_error;
|
| 488 |
|
|
}
|
| 489 |
|
|
|
| 490 |
|
|
addr6 = (struct in6_addr*)&neigh->primary_key;
|
| 491 |
|
|
addr_type = ipv6_addr_type(addr6);
|
| 492 |
|
|
|
| 493 |
|
|
if (addr_type == IPV6_ADDR_ANY) {
|
| 494 |
|
|
addr6 = &skb->nh.ipv6h->daddr;
|
| 495 |
|
|
addr_type = ipv6_addr_type(addr6);
|
| 496 |
|
|
}
|
| 497 |
|
|
|
| 498 |
|
|
if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
|
| 499 |
|
|
goto tx_error_icmp;
|
| 500 |
|
|
|
| 501 |
|
|
dst = addr6->s6_addr32[3];
|
| 502 |
|
|
}
|
| 503 |
|
|
|
| 504 |
|
|
if (ip_route_output(&rt, dst, tiph->saddr, RT_TOS(tos), tunnel->parms.link)) {
|
| 505 |
|
|
tunnel->stat.tx_carrier_errors++;
|
| 506 |
|
|
goto tx_error_icmp;
|
| 507 |
|
|
}
|
| 508 |
|
|
if (rt->rt_type != RTN_UNICAST) {
|
| 509 |
|
|
tunnel->stat.tx_carrier_errors++;
|
| 510 |
|
|
goto tx_error_icmp;
|
| 511 |
|
|
}
|
| 512 |
|
|
tdev = rt->u.dst.dev;
|
| 513 |
|
|
|
| 514 |
|
|
if (tdev == dev) {
|
| 515 |
|
|
ip_rt_put(rt);
|
| 516 |
|
|
tunnel->stat.collisions++;
|
| 517 |
|
|
goto tx_error;
|
| 518 |
|
|
}
|
| 519 |
|
|
|
| 520 |
|
|
if (tiph->frag_off)
|
| 521 |
|
|
mtu = rt->u.dst.pmtu - sizeof(struct iphdr);
|
| 522 |
|
|
else
|
| 523 |
|
|
mtu = skb->dst ? skb->dst->pmtu : dev->mtu;
|
| 524 |
|
|
|
| 525 |
|
|
if (mtu < 68) {
|
| 526 |
|
|
tunnel->stat.collisions++;
|
| 527 |
|
|
ip_rt_put(rt);
|
| 528 |
|
|
goto tx_error;
|
| 529 |
|
|
}
|
| 530 |
|
|
if (mtu < IPV6_MIN_MTU)
|
| 531 |
|
|
mtu = IPV6_MIN_MTU;
|
| 532 |
|
|
if (skb->dst && mtu < skb->dst->pmtu) {
|
| 533 |
|
|
struct rt6_info *rt6 = (struct rt6_info*)skb->dst;
|
| 534 |
|
|
if (mtu < rt6->u.dst.pmtu) {
|
| 535 |
|
|
if (tunnel->parms.iph.daddr || rt6->rt6i_dst.plen == 128) {
|
| 536 |
|
|
rt6->rt6i_flags |= RTF_MODIFIED;
|
| 537 |
|
|
rt6->u.dst.pmtu = mtu;
|
| 538 |
|
|
}
|
| 539 |
|
|
}
|
| 540 |
|
|
}
|
| 541 |
|
|
if (skb->len > mtu) {
|
| 542 |
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
|
| 543 |
|
|
ip_rt_put(rt);
|
| 544 |
|
|
goto tx_error;
|
| 545 |
|
|
}
|
| 546 |
|
|
|
| 547 |
|
|
if (tunnel->err_count > 0) {
|
| 548 |
|
|
if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
|
| 549 |
|
|
tunnel->err_count--;
|
| 550 |
|
|
dst_link_failure(skb);
|
| 551 |
|
|
} else
|
| 552 |
|
|
tunnel->err_count = 0;
|
| 553 |
|
|
}
|
| 554 |
|
|
|
| 555 |
|
|
/*
|
| 556 |
|
|
* Okay, now see if we can stuff it in the buffer as-is.
|
| 557 |
|
|
*/
|
| 558 |
|
|
max_headroom = (((tdev->hard_header_len+15)&~15)+sizeof(struct iphdr));
|
| 559 |
|
|
|
| 560 |
|
|
if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
|
| 561 |
|
|
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
|
| 562 |
|
|
if (!new_skb) {
|
| 563 |
|
|
ip_rt_put(rt);
|
| 564 |
|
|
stats->tx_dropped++;
|
| 565 |
|
|
dev_kfree_skb(skb);
|
| 566 |
|
|
tunnel->recursion--;
|
| 567 |
|
|
return 0;
|
| 568 |
|
|
}
|
| 569 |
|
|
if (skb->sk)
|
| 570 |
|
|
skb_set_owner_w(new_skb, skb->sk);
|
| 571 |
|
|
dev_kfree_skb(skb);
|
| 572 |
|
|
skb = new_skb;
|
| 573 |
|
|
iph6 = skb->nh.ipv6h;
|
| 574 |
|
|
}
|
| 575 |
|
|
|
| 576 |
|
|
skb->h.raw = skb->nh.raw;
|
| 577 |
|
|
skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
|
| 578 |
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
| 579 |
|
|
dst_release(skb->dst);
|
| 580 |
|
|
skb->dst = &rt->u.dst;
|
| 581 |
|
|
|
| 582 |
|
|
/*
|
| 583 |
|
|
* Push down and install the IPIP header.
|
| 584 |
|
|
*/
|
| 585 |
|
|
|
| 586 |
|
|
iph = skb->nh.iph;
|
| 587 |
|
|
iph->version = 4;
|
| 588 |
|
|
iph->ihl = sizeof(struct iphdr)>>2;
|
| 589 |
|
|
if (mtu > IPV6_MIN_MTU)
|
| 590 |
|
|
iph->frag_off = htons(IP_DF);
|
| 591 |
|
|
else
|
| 592 |
|
|
iph->frag_off = 0;
|
| 593 |
|
|
|
| 594 |
|
|
iph->protocol = IPPROTO_IPV6;
|
| 595 |
|
|
iph->tos = INET_ECN_encapsulate(tos, ip6_get_dsfield(iph6));
|
| 596 |
|
|
iph->daddr = rt->rt_dst;
|
| 597 |
|
|
iph->saddr = rt->rt_src;
|
| 598 |
|
|
|
| 599 |
|
|
if ((iph->ttl = tiph->ttl) == 0)
|
| 600 |
|
|
iph->ttl = iph6->hop_limit;
|
| 601 |
|
|
|
| 602 |
|
|
#ifdef CONFIG_NETFILTER
|
| 603 |
|
|
nf_conntrack_put(skb->nfct);
|
| 604 |
|
|
skb->nfct = NULL;
|
| 605 |
|
|
#ifdef CONFIG_NETFILTER_DEBUG
|
| 606 |
|
|
skb->nf_debug = 0;
|
| 607 |
|
|
#endif
|
| 608 |
|
|
#endif
|
| 609 |
|
|
|
| 610 |
|
|
IPTUNNEL_XMIT();
|
| 611 |
|
|
tunnel->recursion--;
|
| 612 |
|
|
return 0;
|
| 613 |
|
|
|
| 614 |
|
|
tx_error_icmp:
|
| 615 |
|
|
dst_link_failure(skb);
|
| 616 |
|
|
tx_error:
|
| 617 |
|
|
stats->tx_errors++;
|
| 618 |
|
|
dev_kfree_skb(skb);
|
| 619 |
|
|
tunnel->recursion--;
|
| 620 |
|
|
return 0;
|
| 621 |
|
|
}
|
| 622 |
|
|
|
| 623 |
|
|
static int
|
| 624 |
|
|
ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
|
| 625 |
|
|
{
|
| 626 |
|
|
int err = 0;
|
| 627 |
|
|
struct ip_tunnel_parm p;
|
| 628 |
|
|
struct ip_tunnel *t;
|
| 629 |
|
|
|
| 630 |
|
|
MOD_INC_USE_COUNT;
|
| 631 |
|
|
|
| 632 |
|
|
switch (cmd) {
|
| 633 |
|
|
case SIOCGETTUNNEL:
|
| 634 |
|
|
t = NULL;
|
| 635 |
|
|
if (dev == &ipip6_fb_tunnel_dev) {
|
| 636 |
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
|
| 637 |
|
|
err = -EFAULT;
|
| 638 |
|
|
break;
|
| 639 |
|
|
}
|
| 640 |
|
|
t = ipip6_tunnel_locate(&p, 0);
|
| 641 |
|
|
}
|
| 642 |
|
|
if (t == NULL)
|
| 643 |
|
|
t = (struct ip_tunnel*)dev->priv;
|
| 644 |
|
|
memcpy(&p, &t->parms, sizeof(p));
|
| 645 |
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
|
| 646 |
|
|
err = -EFAULT;
|
| 647 |
|
|
break;
|
| 648 |
|
|
|
| 649 |
|
|
case SIOCADDTUNNEL:
|
| 650 |
|
|
case SIOCCHGTUNNEL:
|
| 651 |
|
|
err = -EPERM;
|
| 652 |
|
|
if (!capable(CAP_NET_ADMIN))
|
| 653 |
|
|
goto done;
|
| 654 |
|
|
|
| 655 |
|
|
err = -EFAULT;
|
| 656 |
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
| 657 |
|
|
goto done;
|
| 658 |
|
|
|
| 659 |
|
|
err = -EINVAL;
|
| 660 |
|
|
if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
|
| 661 |
|
|
p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
|
| 662 |
|
|
goto done;
|
| 663 |
|
|
if (p.iph.ttl)
|
| 664 |
|
|
p.iph.frag_off |= htons(IP_DF);
|
| 665 |
|
|
|
| 666 |
|
|
t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
|
| 667 |
|
|
|
| 668 |
|
|
if (dev != &ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL &&
|
| 669 |
|
|
t != &ipip6_fb_tunnel) {
|
| 670 |
|
|
if (t != NULL) {
|
| 671 |
|
|
if (t->dev != dev) {
|
| 672 |
|
|
err = -EEXIST;
|
| 673 |
|
|
break;
|
| 674 |
|
|
}
|
| 675 |
|
|
} else {
|
| 676 |
|
|
if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
|
| 677 |
|
|
(!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
|
| 678 |
|
|
err = -EINVAL;
|
| 679 |
|
|
break;
|
| 680 |
|
|
}
|
| 681 |
|
|
t = (struct ip_tunnel*)dev->priv;
|
| 682 |
|
|
ipip6_tunnel_unlink(t);
|
| 683 |
|
|
t->parms.iph.saddr = p.iph.saddr;
|
| 684 |
|
|
t->parms.iph.daddr = p.iph.daddr;
|
| 685 |
|
|
memcpy(dev->dev_addr, &p.iph.saddr, 4);
|
| 686 |
|
|
memcpy(dev->broadcast, &p.iph.daddr, 4);
|
| 687 |
|
|
ipip6_tunnel_link(t);
|
| 688 |
|
|
netdev_state_change(dev);
|
| 689 |
|
|
}
|
| 690 |
|
|
}
|
| 691 |
|
|
|
| 692 |
|
|
if (t) {
|
| 693 |
|
|
err = 0;
|
| 694 |
|
|
if (cmd == SIOCCHGTUNNEL) {
|
| 695 |
|
|
t->parms.iph.ttl = p.iph.ttl;
|
| 696 |
|
|
t->parms.iph.tos = p.iph.tos;
|
| 697 |
|
|
}
|
| 698 |
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
|
| 699 |
|
|
err = -EFAULT;
|
| 700 |
|
|
} else
|
| 701 |
|
|
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
|
| 702 |
|
|
break;
|
| 703 |
|
|
|
| 704 |
|
|
case SIOCDELTUNNEL:
|
| 705 |
|
|
err = -EPERM;
|
| 706 |
|
|
if (!capable(CAP_NET_ADMIN))
|
| 707 |
|
|
goto done;
|
| 708 |
|
|
|
| 709 |
|
|
if (dev == &ipip6_fb_tunnel_dev) {
|
| 710 |
|
|
err = -EFAULT;
|
| 711 |
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
| 712 |
|
|
goto done;
|
| 713 |
|
|
err = -ENOENT;
|
| 714 |
|
|
if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
|
| 715 |
|
|
goto done;
|
| 716 |
|
|
err = -EPERM;
|
| 717 |
|
|
if (t == &ipip6_fb_tunnel)
|
| 718 |
|
|
goto done;
|
| 719 |
|
|
dev = t->dev;
|
| 720 |
|
|
}
|
| 721 |
|
|
err = unregister_netdevice(dev);
|
| 722 |
|
|
break;
|
| 723 |
|
|
|
| 724 |
|
|
default:
|
| 725 |
|
|
err = -EINVAL;
|
| 726 |
|
|
}
|
| 727 |
|
|
|
| 728 |
|
|
done:
|
| 729 |
|
|
MOD_DEC_USE_COUNT;
|
| 730 |
|
|
return err;
|
| 731 |
|
|
}
|
| 732 |
|
|
|
| 733 |
|
|
static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
|
| 734 |
|
|
{
|
| 735 |
|
|
return &(((struct ip_tunnel*)dev->priv)->stat);
|
| 736 |
|
|
}
|
| 737 |
|
|
|
| 738 |
|
|
static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
|
| 739 |
|
|
{
|
| 740 |
|
|
if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
|
| 741 |
|
|
return -EINVAL;
|
| 742 |
|
|
dev->mtu = new_mtu;
|
| 743 |
|
|
return 0;
|
| 744 |
|
|
}
|
| 745 |
|
|
|
| 746 |
|
|
static void ipip6_tunnel_init_gen(struct net_device *dev)
|
| 747 |
|
|
{
|
| 748 |
|
|
struct ip_tunnel *t = (struct ip_tunnel*)dev->priv;
|
| 749 |
|
|
|
| 750 |
|
|
dev->destructor = ipip6_tunnel_destructor;
|
| 751 |
|
|
dev->uninit = ipip6_tunnel_uninit;
|
| 752 |
|
|
dev->hard_start_xmit = ipip6_tunnel_xmit;
|
| 753 |
|
|
dev->get_stats = ipip6_tunnel_get_stats;
|
| 754 |
|
|
dev->do_ioctl = ipip6_tunnel_ioctl;
|
| 755 |
|
|
dev->change_mtu = ipip6_tunnel_change_mtu;
|
| 756 |
|
|
|
| 757 |
|
|
dev->type = ARPHRD_SIT;
|
| 758 |
|
|
dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
|
| 759 |
|
|
dev->mtu = 1500 - sizeof(struct iphdr);
|
| 760 |
|
|
dev->flags = IFF_NOARP;
|
| 761 |
|
|
dev->iflink = 0;
|
| 762 |
|
|
dev->addr_len = 4;
|
| 763 |
|
|
memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
|
| 764 |
|
|
memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
|
| 765 |
|
|
}
|
| 766 |
|
|
|
| 767 |
|
|
static int ipip6_tunnel_init(struct net_device *dev)
|
| 768 |
|
|
{
|
| 769 |
|
|
struct net_device *tdev = NULL;
|
| 770 |
|
|
struct ip_tunnel *tunnel;
|
| 771 |
|
|
struct iphdr *iph;
|
| 772 |
|
|
|
| 773 |
|
|
tunnel = (struct ip_tunnel*)dev->priv;
|
| 774 |
|
|
iph = &tunnel->parms.iph;
|
| 775 |
|
|
|
| 776 |
|
|
ipip6_tunnel_init_gen(dev);
|
| 777 |
|
|
|
| 778 |
|
|
if (iph->daddr) {
|
| 779 |
|
|
struct rtable *rt;
|
| 780 |
|
|
if (!ip_route_output(&rt, iph->daddr, iph->saddr, RT_TOS(iph->tos), tunnel->parms.link)) {
|
| 781 |
|
|
tdev = rt->u.dst.dev;
|
| 782 |
|
|
ip_rt_put(rt);
|
| 783 |
|
|
}
|
| 784 |
|
|
dev->flags |= IFF_POINTOPOINT;
|
| 785 |
|
|
}
|
| 786 |
|
|
|
| 787 |
|
|
if (!tdev && tunnel->parms.link)
|
| 788 |
|
|
tdev = __dev_get_by_index(tunnel->parms.link);
|
| 789 |
|
|
|
| 790 |
|
|
if (tdev) {
|
| 791 |
|
|
dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
|
| 792 |
|
|
dev->mtu = tdev->mtu - sizeof(struct iphdr);
|
| 793 |
|
|
if (dev->mtu < IPV6_MIN_MTU)
|
| 794 |
|
|
dev->mtu = IPV6_MIN_MTU;
|
| 795 |
|
|
}
|
| 796 |
|
|
dev->iflink = tunnel->parms.link;
|
| 797 |
|
|
|
| 798 |
|
|
return 0;
|
| 799 |
|
|
}
|
| 800 |
|
|
|
| 801 |
|
|
#ifdef MODULE
|
| 802 |
|
|
static int ipip6_fb_tunnel_open(struct net_device *dev)
|
| 803 |
|
|
{
|
| 804 |
|
|
MOD_INC_USE_COUNT;
|
| 805 |
|
|
return 0;
|
| 806 |
|
|
}
|
| 807 |
|
|
|
| 808 |
|
|
static int ipip6_fb_tunnel_close(struct net_device *dev)
|
| 809 |
|
|
{
|
| 810 |
|
|
MOD_DEC_USE_COUNT;
|
| 811 |
|
|
return 0;
|
| 812 |
|
|
}
|
| 813 |
|
|
#endif
|
| 814 |
|
|
|
| 815 |
|
|
int __init ipip6_fb_tunnel_init(struct net_device *dev)
|
| 816 |
|
|
{
|
| 817 |
|
|
struct iphdr *iph;
|
| 818 |
|
|
|
| 819 |
|
|
ipip6_tunnel_init_gen(dev);
|
| 820 |
|
|
#ifdef MODULE
|
| 821 |
|
|
dev->open = ipip6_fb_tunnel_open;
|
| 822 |
|
|
dev->stop = ipip6_fb_tunnel_close;
|
| 823 |
|
|
#endif
|
| 824 |
|
|
|
| 825 |
|
|
iph = &ipip6_fb_tunnel.parms.iph;
|
| 826 |
|
|
iph->version = 4;
|
| 827 |
|
|
iph->protocol = IPPROTO_IPV6;
|
| 828 |
|
|
iph->ihl = 5;
|
| 829 |
|
|
iph->ttl = 64;
|
| 830 |
|
|
|
| 831 |
|
|
dev_hold(dev);
|
| 832 |
|
|
tunnels_wc[0] = &ipip6_fb_tunnel;
|
| 833 |
|
|
return 0;
|
| 834 |
|
|
}
|
| 835 |
|
|
|
| 836 |
|
|
static struct inet_protocol sit_protocol = {
|
| 837 |
|
|
ipip6_rcv,
|
| 838 |
|
|
ipip6_err,
|
| 839 |
|
|
0,
|
| 840 |
|
|
IPPROTO_IPV6,
|
| 841 |
|
|
0,
|
| 842 |
|
|
NULL,
|
| 843 |
|
|
"IPv6"
|
| 844 |
|
|
};
|
| 845 |
|
|
|
| 846 |
|
|
#ifdef MODULE
|
| 847 |
|
|
void sit_cleanup(void)
|
| 848 |
|
|
{
|
| 849 |
|
|
inet_del_protocol(&sit_protocol);
|
| 850 |
|
|
unregister_netdev(&ipip6_fb_tunnel_dev);
|
| 851 |
|
|
}
|
| 852 |
|
|
#endif
|
| 853 |
|
|
|
| 854 |
|
|
int __init sit_init(void)
|
| 855 |
|
|
{
|
| 856 |
|
|
printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
|
| 857 |
|
|
|
| 858 |
|
|
ipip6_fb_tunnel_dev.priv = (void*)&ipip6_fb_tunnel;
|
| 859 |
|
|
strcpy(ipip6_fb_tunnel_dev.name, ipip6_fb_tunnel.parms.name);
|
| 860 |
|
|
register_netdev(&ipip6_fb_tunnel_dev);
|
| 861 |
|
|
inet_add_protocol(&sit_protocol);
|
| 862 |
|
|
return 0;
|
| 863 |
|
|
}
|
