/*
|
/*
|
* IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
|
* IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
|
* Linux INET6 implementation
|
* Linux INET6 implementation
|
*
|
*
|
* Authors:
|
* Authors:
|
* Pedro Roque <roque@di.fc.ul.pt>
|
* Pedro Roque <roque@di.fc.ul.pt>
|
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
|
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
|
*
|
*
|
* $Id: sit.c,v 1.1.1.1 2004-04-15 01:14:34 phoenix Exp $
|
* $Id: sit.c,v 1.1.1.1 2004-04-15 01:14:34 phoenix Exp $
|
*
|
*
|
* This program is free software; you can redistribute it and/or
|
* This program is free software; you can redistribute it and/or
|
* modify it under the terms of the GNU General Public License
|
* modify it under the terms of the GNU General Public License
|
* as published by the Free Software Foundation; either version
|
* as published by the Free Software Foundation; either version
|
* 2 of the License, or (at your option) any later version.
|
* 2 of the License, or (at your option) any later version.
|
*
|
*
|
* Changes:
|
* Changes:
|
* Roger Venning <r.venning@telstra.com>: 6to4 support
|
* Roger Venning <r.venning@telstra.com>: 6to4 support
|
* Nate Thompson <nate@thebog.net>: 6to4 support
|
* Nate Thompson <nate@thebog.net>: 6to4 support
|
*/
|
*/
|
|
|
#include <linux/config.h>
|
#include <linux/config.h>
|
#include <linux/module.h>
|
#include <linux/module.h>
|
#include <linux/errno.h>
|
#include <linux/errno.h>
|
#include <linux/types.h>
|
#include <linux/types.h>
|
#include <linux/socket.h>
|
#include <linux/socket.h>
|
#include <linux/sockios.h>
|
#include <linux/sockios.h>
|
#include <linux/sched.h>
|
#include <linux/sched.h>
|
#include <linux/net.h>
|
#include <linux/net.h>
|
#include <linux/in6.h>
|
#include <linux/in6.h>
|
#include <linux/netdevice.h>
|
#include <linux/netdevice.h>
|
#include <linux/if_arp.h>
|
#include <linux/if_arp.h>
|
#include <linux/icmp.h>
|
#include <linux/icmp.h>
|
#include <asm/uaccess.h>
|
#include <asm/uaccess.h>
|
#include <linux/init.h>
|
#include <linux/init.h>
|
#include <linux/netfilter_ipv4.h>
|
#include <linux/netfilter_ipv4.h>
|
|
|
#include <net/sock.h>
|
#include <net/sock.h>
|
#include <net/snmp.h>
|
#include <net/snmp.h>
|
|
|
#include <net/ipv6.h>
|
#include <net/ipv6.h>
|
#include <net/protocol.h>
|
#include <net/protocol.h>
|
#include <net/transp_v6.h>
|
#include <net/transp_v6.h>
|
#include <net/ip6_fib.h>
|
#include <net/ip6_fib.h>
|
#include <net/ip6_route.h>
|
#include <net/ip6_route.h>
|
#include <net/ndisc.h>
|
#include <net/ndisc.h>
|
#include <net/addrconf.h>
|
#include <net/addrconf.h>
|
#include <net/ip.h>
|
#include <net/ip.h>
|
#include <net/udp.h>
|
#include <net/udp.h>
|
#include <net/icmp.h>
|
#include <net/icmp.h>
|
#include <net/ipip.h>
|
#include <net/ipip.h>
|
#include <net/inet_ecn.h>
|
#include <net/inet_ecn.h>
|
|
|
/*
|
/*
|
This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
|
This version of net/ipv6/sit.c is cloned of net/ipv4/ip_gre.c
|
|
|
For comments look at net/ipv4/ip_gre.c --ANK
|
For comments look at net/ipv4/ip_gre.c --ANK
|
*/
|
*/
|
|
|
#define HASH_SIZE 16
|
#define HASH_SIZE 16
|
#define HASH(addr) ((addr^(addr>>4))&0xF)
|
#define HASH(addr) ((addr^(addr>>4))&0xF)
|
|
|
static int ipip6_fb_tunnel_init(struct net_device *dev);
|
static int ipip6_fb_tunnel_init(struct net_device *dev);
|
static int ipip6_tunnel_init(struct net_device *dev);
|
static int ipip6_tunnel_init(struct net_device *dev);
|
|
|
static struct net_device ipip6_fb_tunnel_dev = {
|
static struct net_device ipip6_fb_tunnel_dev = {
|
name: "sit0",
|
name: "sit0",
|
init: ipip6_fb_tunnel_init,
|
init: ipip6_fb_tunnel_init,
|
};
|
};
|
|
|
static struct ip_tunnel ipip6_fb_tunnel = {
|
static struct ip_tunnel ipip6_fb_tunnel = {
|
NULL, &ipip6_fb_tunnel_dev, {0, }, 0, 0, 0, 0, 0, 0, 0, {"sit0", }
|
NULL, &ipip6_fb_tunnel_dev, {0, }, 0, 0, 0, 0, 0, 0, 0, {"sit0", }
|
};
|
};
|
|
|
static struct ip_tunnel *tunnels_r_l[HASH_SIZE];
|
static struct ip_tunnel *tunnels_r_l[HASH_SIZE];
|
static struct ip_tunnel *tunnels_r[HASH_SIZE];
|
static struct ip_tunnel *tunnels_r[HASH_SIZE];
|
static struct ip_tunnel *tunnels_l[HASH_SIZE];
|
static struct ip_tunnel *tunnels_l[HASH_SIZE];
|
static struct ip_tunnel *tunnels_wc[1];
|
static struct ip_tunnel *tunnels_wc[1];
|
static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l };
|
static struct ip_tunnel **tunnels[4] = { tunnels_wc, tunnels_l, tunnels_r, tunnels_r_l };
|
|
|
static rwlock_t ipip6_lock = RW_LOCK_UNLOCKED;
|
static rwlock_t ipip6_lock = RW_LOCK_UNLOCKED;
|
|
|
static struct ip_tunnel * ipip6_tunnel_lookup(u32 remote, u32 local)
|
static struct ip_tunnel * ipip6_tunnel_lookup(u32 remote, u32 local)
|
{
|
{
|
unsigned h0 = HASH(remote);
|
unsigned h0 = HASH(remote);
|
unsigned h1 = HASH(local);
|
unsigned h1 = HASH(local);
|
struct ip_tunnel *t;
|
struct ip_tunnel *t;
|
|
|
for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
|
for (t = tunnels_r_l[h0^h1]; t; t = t->next) {
|
if (local == t->parms.iph.saddr &&
|
if (local == t->parms.iph.saddr &&
|
remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
|
remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
|
return t;
|
return t;
|
}
|
}
|
for (t = tunnels_r[h0]; t; t = t->next) {
|
for (t = tunnels_r[h0]; t; t = t->next) {
|
if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
|
if (remote == t->parms.iph.daddr && (t->dev->flags&IFF_UP))
|
return t;
|
return t;
|
}
|
}
|
for (t = tunnels_l[h1]; t; t = t->next) {
|
for (t = tunnels_l[h1]; t; t = t->next) {
|
if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
|
if (local == t->parms.iph.saddr && (t->dev->flags&IFF_UP))
|
return t;
|
return t;
|
}
|
}
|
if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
|
if ((t = tunnels_wc[0]) != NULL && (t->dev->flags&IFF_UP))
|
return t;
|
return t;
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
static struct ip_tunnel ** ipip6_bucket(struct ip_tunnel *t)
|
static struct ip_tunnel ** ipip6_bucket(struct ip_tunnel *t)
|
{
|
{
|
u32 remote = t->parms.iph.daddr;
|
u32 remote = t->parms.iph.daddr;
|
u32 local = t->parms.iph.saddr;
|
u32 local = t->parms.iph.saddr;
|
unsigned h = 0;
|
unsigned h = 0;
|
int prio = 0;
|
int prio = 0;
|
|
|
if (remote) {
|
if (remote) {
|
prio |= 2;
|
prio |= 2;
|
h ^= HASH(remote);
|
h ^= HASH(remote);
|
}
|
}
|
if (local) {
|
if (local) {
|
prio |= 1;
|
prio |= 1;
|
h ^= HASH(local);
|
h ^= HASH(local);
|
}
|
}
|
return &tunnels[prio][h];
|
return &tunnels[prio][h];
|
}
|
}
|
|
|
static void ipip6_tunnel_unlink(struct ip_tunnel *t)
|
static void ipip6_tunnel_unlink(struct ip_tunnel *t)
|
{
|
{
|
struct ip_tunnel **tp;
|
struct ip_tunnel **tp;
|
|
|
for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) {
|
for (tp = ipip6_bucket(t); *tp; tp = &(*tp)->next) {
|
if (t == *tp) {
|
if (t == *tp) {
|
write_lock_bh(&ipip6_lock);
|
write_lock_bh(&ipip6_lock);
|
*tp = t->next;
|
*tp = t->next;
|
write_unlock_bh(&ipip6_lock);
|
write_unlock_bh(&ipip6_lock);
|
break;
|
break;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
static void ipip6_tunnel_link(struct ip_tunnel *t)
|
static void ipip6_tunnel_link(struct ip_tunnel *t)
|
{
|
{
|
struct ip_tunnel **tp = ipip6_bucket(t);
|
struct ip_tunnel **tp = ipip6_bucket(t);
|
|
|
write_lock_bh(&ipip6_lock);
|
write_lock_bh(&ipip6_lock);
|
t->next = *tp;
|
t->next = *tp;
|
write_unlock_bh(&ipip6_lock);
|
write_unlock_bh(&ipip6_lock);
|
*tp = t;
|
*tp = t;
|
}
|
}
|
|
|
struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create)
|
struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create)
|
{
|
{
|
u32 remote = parms->iph.daddr;
|
u32 remote = parms->iph.daddr;
|
u32 local = parms->iph.saddr;
|
u32 local = parms->iph.saddr;
|
struct ip_tunnel *t, **tp, *nt;
|
struct ip_tunnel *t, **tp, *nt;
|
struct net_device *dev;
|
struct net_device *dev;
|
unsigned h = 0;
|
unsigned h = 0;
|
int prio = 0;
|
int prio = 0;
|
|
|
if (remote) {
|
if (remote) {
|
prio |= 2;
|
prio |= 2;
|
h ^= HASH(remote);
|
h ^= HASH(remote);
|
}
|
}
|
if (local) {
|
if (local) {
|
prio |= 1;
|
prio |= 1;
|
h ^= HASH(local);
|
h ^= HASH(local);
|
}
|
}
|
for (tp = &tunnels[prio][h]; (t = *tp) != NULL; tp = &t->next) {
|
for (tp = &tunnels[prio][h]; (t = *tp) != NULL; tp = &t->next) {
|
if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
|
if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
|
return t;
|
return t;
|
}
|
}
|
if (!create)
|
if (!create)
|
return NULL;
|
return NULL;
|
|
|
MOD_INC_USE_COUNT;
|
MOD_INC_USE_COUNT;
|
dev = kmalloc(sizeof(*dev) + sizeof(*t), GFP_KERNEL);
|
dev = kmalloc(sizeof(*dev) + sizeof(*t), GFP_KERNEL);
|
if (dev == NULL) {
|
if (dev == NULL) {
|
MOD_DEC_USE_COUNT;
|
MOD_DEC_USE_COUNT;
|
return NULL;
|
return NULL;
|
}
|
}
|
memset(dev, 0, sizeof(*dev) + sizeof(*t));
|
memset(dev, 0, sizeof(*dev) + sizeof(*t));
|
dev->priv = (void*)(dev+1);
|
dev->priv = (void*)(dev+1);
|
nt = (struct ip_tunnel*)dev->priv;
|
nt = (struct ip_tunnel*)dev->priv;
|
nt->dev = dev;
|
nt->dev = dev;
|
dev->init = ipip6_tunnel_init;
|
dev->init = ipip6_tunnel_init;
|
dev->features |= NETIF_F_DYNALLOC;
|
dev->features |= NETIF_F_DYNALLOC;
|
memcpy(&nt->parms, parms, sizeof(*parms));
|
memcpy(&nt->parms, parms, sizeof(*parms));
|
nt->parms.name[IFNAMSIZ-1] = '\0';
|
nt->parms.name[IFNAMSIZ-1] = '\0';
|
strcpy(dev->name, nt->parms.name);
|
strcpy(dev->name, nt->parms.name);
|
if (dev->name[0] == 0) {
|
if (dev->name[0] == 0) {
|
int i;
|
int i;
|
for (i=1; i<100; i++) {
|
for (i=1; i<100; i++) {
|
sprintf(dev->name, "sit%d", i);
|
sprintf(dev->name, "sit%d", i);
|
if (__dev_get_by_name(dev->name) == NULL)
|
if (__dev_get_by_name(dev->name) == NULL)
|
break;
|
break;
|
}
|
}
|
if (i==100)
|
if (i==100)
|
goto failed;
|
goto failed;
|
memcpy(nt->parms.name, dev->name, IFNAMSIZ);
|
memcpy(nt->parms.name, dev->name, IFNAMSIZ);
|
}
|
}
|
if (register_netdevice(dev) < 0)
|
if (register_netdevice(dev) < 0)
|
goto failed;
|
goto failed;
|
|
|
dev_hold(dev);
|
dev_hold(dev);
|
ipip6_tunnel_link(nt);
|
ipip6_tunnel_link(nt);
|
/* Do not decrement MOD_USE_COUNT here. */
|
/* Do not decrement MOD_USE_COUNT here. */
|
return nt;
|
return nt;
|
|
|
failed:
|
failed:
|
kfree(dev);
|
kfree(dev);
|
MOD_DEC_USE_COUNT;
|
MOD_DEC_USE_COUNT;
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
static void ipip6_tunnel_destructor(struct net_device *dev)
|
static void ipip6_tunnel_destructor(struct net_device *dev)
|
{
|
{
|
if (dev != &ipip6_fb_tunnel_dev) {
|
if (dev != &ipip6_fb_tunnel_dev) {
|
MOD_DEC_USE_COUNT;
|
MOD_DEC_USE_COUNT;
|
}
|
}
|
}
|
}
|
|
|
static void ipip6_tunnel_uninit(struct net_device *dev)
|
static void ipip6_tunnel_uninit(struct net_device *dev)
|
{
|
{
|
if (dev == &ipip6_fb_tunnel_dev) {
|
if (dev == &ipip6_fb_tunnel_dev) {
|
write_lock_bh(&ipip6_lock);
|
write_lock_bh(&ipip6_lock);
|
tunnels_wc[0] = NULL;
|
tunnels_wc[0] = NULL;
|
write_unlock_bh(&ipip6_lock);
|
write_unlock_bh(&ipip6_lock);
|
dev_put(dev);
|
dev_put(dev);
|
} else {
|
} else {
|
ipip6_tunnel_unlink((struct ip_tunnel*)dev->priv);
|
ipip6_tunnel_unlink((struct ip_tunnel*)dev->priv);
|
dev_put(dev);
|
dev_put(dev);
|
}
|
}
|
}
|
}
|
|
|
|
|
void ipip6_err(struct sk_buff *skb, u32 info)
|
void ipip6_err(struct sk_buff *skb, u32 info)
|
{
|
{
|
#ifndef I_WISH_WORLD_WERE_PERFECT
|
#ifndef I_WISH_WORLD_WERE_PERFECT
|
|
|
/* It is not :-( All the routers (except for Linux) return only
|
/* It is not :-( All the routers (except for Linux) return only
|
8 bytes of packet payload. It means, that precise relaying of
|
8 bytes of packet payload. It means, that precise relaying of
|
ICMP in the real Internet is absolutely infeasible.
|
ICMP in the real Internet is absolutely infeasible.
|
*/
|
*/
|
struct iphdr *iph = (struct iphdr*)skb->data;
|
struct iphdr *iph = (struct iphdr*)skb->data;
|
int type = skb->h.icmph->type;
|
int type = skb->h.icmph->type;
|
int code = skb->h.icmph->code;
|
int code = skb->h.icmph->code;
|
struct ip_tunnel *t;
|
struct ip_tunnel *t;
|
|
|
switch (type) {
|
switch (type) {
|
default:
|
default:
|
case ICMP_PARAMETERPROB:
|
case ICMP_PARAMETERPROB:
|
return;
|
return;
|
|
|
case ICMP_DEST_UNREACH:
|
case ICMP_DEST_UNREACH:
|
switch (code) {
|
switch (code) {
|
case ICMP_SR_FAILED:
|
case ICMP_SR_FAILED:
|
case ICMP_PORT_UNREACH:
|
case ICMP_PORT_UNREACH:
|
/* Impossible event. */
|
/* Impossible event. */
|
return;
|
return;
|
case ICMP_FRAG_NEEDED:
|
case ICMP_FRAG_NEEDED:
|
/* Soft state for pmtu is maintained by IP core. */
|
/* Soft state for pmtu is maintained by IP core. */
|
return;
|
return;
|
default:
|
default:
|
/* All others are translated to HOST_UNREACH.
|
/* All others are translated to HOST_UNREACH.
|
rfc2003 contains "deep thoughts" about NET_UNREACH,
|
rfc2003 contains "deep thoughts" about NET_UNREACH,
|
I believe they are just ether pollution. --ANK
|
I believe they are just ether pollution. --ANK
|
*/
|
*/
|
break;
|
break;
|
}
|
}
|
break;
|
break;
|
case ICMP_TIME_EXCEEDED:
|
case ICMP_TIME_EXCEEDED:
|
if (code != ICMP_EXC_TTL)
|
if (code != ICMP_EXC_TTL)
|
return;
|
return;
|
break;
|
break;
|
}
|
}
|
|
|
read_lock(&ipip6_lock);
|
read_lock(&ipip6_lock);
|
t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
|
t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
|
if (t == NULL || t->parms.iph.daddr == 0)
|
if (t == NULL || t->parms.iph.daddr == 0)
|
goto out;
|
goto out;
|
if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
|
if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
|
goto out;
|
goto out;
|
|
|
if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
|
if (jiffies - t->err_time < IPTUNNEL_ERR_TIMEO)
|
t->err_count++;
|
t->err_count++;
|
else
|
else
|
t->err_count = 1;
|
t->err_count = 1;
|
t->err_time = jiffies;
|
t->err_time = jiffies;
|
out:
|
out:
|
read_unlock(&ipip6_lock);
|
read_unlock(&ipip6_lock);
|
return;
|
return;
|
#else
|
#else
|
struct iphdr *iph = (struct iphdr*)dp;
|
struct iphdr *iph = (struct iphdr*)dp;
|
int hlen = iph->ihl<<2;
|
int hlen = iph->ihl<<2;
|
struct ipv6hdr *iph6;
|
struct ipv6hdr *iph6;
|
int type = skb->h.icmph->type;
|
int type = skb->h.icmph->type;
|
int code = skb->h.icmph->code;
|
int code = skb->h.icmph->code;
|
int rel_type = 0;
|
int rel_type = 0;
|
int rel_code = 0;
|
int rel_code = 0;
|
int rel_info = 0;
|
int rel_info = 0;
|
struct sk_buff *skb2;
|
struct sk_buff *skb2;
|
struct rt6_info *rt6i;
|
struct rt6_info *rt6i;
|
|
|
if (len < hlen + sizeof(struct ipv6hdr))
|
if (len < hlen + sizeof(struct ipv6hdr))
|
return;
|
return;
|
iph6 = (struct ipv6hdr*)(dp + hlen);
|
iph6 = (struct ipv6hdr*)(dp + hlen);
|
|
|
switch (type) {
|
switch (type) {
|
default:
|
default:
|
return;
|
return;
|
case ICMP_PARAMETERPROB:
|
case ICMP_PARAMETERPROB:
|
if (skb->h.icmph->un.gateway < hlen)
|
if (skb->h.icmph->un.gateway < hlen)
|
return;
|
return;
|
|
|
/* So... This guy found something strange INSIDE encapsulated
|
/* So... This guy found something strange INSIDE encapsulated
|
packet. Well, he is fool, but what can we do ?
|
packet. Well, he is fool, but what can we do ?
|
*/
|
*/
|
rel_type = ICMPV6_PARAMPROB;
|
rel_type = ICMPV6_PARAMPROB;
|
rel_info = skb->h.icmph->un.gateway - hlen;
|
rel_info = skb->h.icmph->un.gateway - hlen;
|
break;
|
break;
|
|
|
case ICMP_DEST_UNREACH:
|
case ICMP_DEST_UNREACH:
|
switch (code) {
|
switch (code) {
|
case ICMP_SR_FAILED:
|
case ICMP_SR_FAILED:
|
case ICMP_PORT_UNREACH:
|
case ICMP_PORT_UNREACH:
|
/* Impossible event. */
|
/* Impossible event. */
|
return;
|
return;
|
case ICMP_FRAG_NEEDED:
|
case ICMP_FRAG_NEEDED:
|
/* Too complicated case ... */
|
/* Too complicated case ... */
|
return;
|
return;
|
default:
|
default:
|
/* All others are translated to HOST_UNREACH.
|
/* All others are translated to HOST_UNREACH.
|
rfc2003 contains "deep thoughts" about NET_UNREACH,
|
rfc2003 contains "deep thoughts" about NET_UNREACH,
|
I believe, it is just ether pollution. --ANK
|
I believe, it is just ether pollution. --ANK
|
*/
|
*/
|
rel_type = ICMPV6_DEST_UNREACH;
|
rel_type = ICMPV6_DEST_UNREACH;
|
rel_code = ICMPV6_ADDR_UNREACH;
|
rel_code = ICMPV6_ADDR_UNREACH;
|
break;
|
break;
|
}
|
}
|
break;
|
break;
|
case ICMP_TIME_EXCEEDED:
|
case ICMP_TIME_EXCEEDED:
|
if (code != ICMP_EXC_TTL)
|
if (code != ICMP_EXC_TTL)
|
return;
|
return;
|
rel_type = ICMPV6_TIME_EXCEED;
|
rel_type = ICMPV6_TIME_EXCEED;
|
rel_code = ICMPV6_EXC_HOPLIMIT;
|
rel_code = ICMPV6_EXC_HOPLIMIT;
|
break;
|
break;
|
}
|
}
|
|
|
/* Prepare fake skb to feed it to icmpv6_send */
|
/* Prepare fake skb to feed it to icmpv6_send */
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
if (skb2 == NULL)
|
if (skb2 == NULL)
|
return;
|
return;
|
dst_release(skb2->dst);
|
dst_release(skb2->dst);
|
skb2->dst = NULL;
|
skb2->dst = NULL;
|
skb_pull(skb2, skb->data - (u8*)iph6);
|
skb_pull(skb2, skb->data - (u8*)iph6);
|
skb2->nh.raw = skb2->data;
|
skb2->nh.raw = skb2->data;
|
|
|
/* Try to guess incoming interface */
|
/* Try to guess incoming interface */
|
rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0);
|
rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0);
|
if (rt6i && rt6i->rt6i_dev) {
|
if (rt6i && rt6i->rt6i_dev) {
|
skb2->dev = rt6i->rt6i_dev;
|
skb2->dev = rt6i->rt6i_dev;
|
|
|
rt6i = rt6_lookup(&iph6->daddr, &iph6->saddr, NULL, 0);
|
rt6i = rt6_lookup(&iph6->daddr, &iph6->saddr, NULL, 0);
|
|
|
if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
|
if (rt6i && rt6i->rt6i_dev && rt6i->rt6i_dev->type == ARPHRD_SIT) {
|
struct ip_tunnel * t = (struct ip_tunnel*)rt6i->rt6i_dev->priv;
|
struct ip_tunnel * t = (struct ip_tunnel*)rt6i->rt6i_dev->priv;
|
if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
|
if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
|
rel_type = ICMPV6_DEST_UNREACH;
|
rel_type = ICMPV6_DEST_UNREACH;
|
rel_code = ICMPV6_ADDR_UNREACH;
|
rel_code = ICMPV6_ADDR_UNREACH;
|
}
|
}
|
icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
|
icmpv6_send(skb2, rel_type, rel_code, rel_info, skb2->dev);
|
}
|
}
|
}
|
}
|
kfree_skb(skb2);
|
kfree_skb(skb2);
|
return;
|
return;
|
#endif
|
#endif
|
}
|
}
|
|
|
static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
|
static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
|
{
|
{
|
if (INET_ECN_is_ce(iph->tos) &&
|
if (INET_ECN_is_ce(iph->tos) &&
|
INET_ECN_is_not_ce(ip6_get_dsfield(skb->nh.ipv6h)))
|
INET_ECN_is_not_ce(ip6_get_dsfield(skb->nh.ipv6h)))
|
IP6_ECN_set_ce(skb->nh.ipv6h);
|
IP6_ECN_set_ce(skb->nh.ipv6h);
|
}
|
}
|
|
|
int ipip6_rcv(struct sk_buff *skb)
|
int ipip6_rcv(struct sk_buff *skb)
|
{
|
{
|
struct iphdr *iph;
|
struct iphdr *iph;
|
struct ip_tunnel *tunnel;
|
struct ip_tunnel *tunnel;
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
goto out;
|
goto out;
|
|
|
iph = skb->nh.iph;
|
iph = skb->nh.iph;
|
|
|
read_lock(&ipip6_lock);
|
read_lock(&ipip6_lock);
|
if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
|
if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
|
skb->mac.raw = skb->nh.raw;
|
skb->mac.raw = skb->nh.raw;
|
skb->nh.raw = skb->data;
|
skb->nh.raw = skb->data;
|
memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
|
memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
|
skb->protocol = htons(ETH_P_IPV6);
|
skb->protocol = htons(ETH_P_IPV6);
|
skb->pkt_type = PACKET_HOST;
|
skb->pkt_type = PACKET_HOST;
|
tunnel->stat.rx_packets++;
|
tunnel->stat.rx_packets++;
|
tunnel->stat.rx_bytes += skb->len;
|
tunnel->stat.rx_bytes += skb->len;
|
skb->dev = tunnel->dev;
|
skb->dev = tunnel->dev;
|
dst_release(skb->dst);
|
dst_release(skb->dst);
|
skb->dst = NULL;
|
skb->dst = NULL;
|
#ifdef CONFIG_NETFILTER
|
#ifdef CONFIG_NETFILTER
|
nf_conntrack_put(skb->nfct);
|
nf_conntrack_put(skb->nfct);
|
skb->nfct = NULL;
|
skb->nfct = NULL;
|
#ifdef CONFIG_NETFILTER_DEBUG
|
#ifdef CONFIG_NETFILTER_DEBUG
|
skb->nf_debug = 0;
|
skb->nf_debug = 0;
|
#endif
|
#endif
|
#endif
|
#endif
|
ipip6_ecn_decapsulate(iph, skb);
|
ipip6_ecn_decapsulate(iph, skb);
|
netif_rx(skb);
|
netif_rx(skb);
|
read_unlock(&ipip6_lock);
|
read_unlock(&ipip6_lock);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0);
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0);
|
kfree_skb(skb);
|
kfree_skb(skb);
|
read_unlock(&ipip6_lock);
|
read_unlock(&ipip6_lock);
|
out:
|
out:
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Need this wrapper because NF_HOOK takes the function address */
|
/* Need this wrapper because NF_HOOK takes the function address */
|
static inline int do_ip_send(struct sk_buff *skb)
|
static inline int do_ip_send(struct sk_buff *skb)
|
{
|
{
|
return ip_send(skb);
|
return ip_send(skb);
|
}
|
}
|
|
|
|
|
/* Returns the embedded IPv4 address if the IPv6 address
|
/* Returns the embedded IPv4 address if the IPv6 address
|
comes from 6to4 (draft-ietf-ngtrans-6to4-04) addr space */
|
comes from 6to4 (draft-ietf-ngtrans-6to4-04) addr space */
|
|
|
static inline u32 try_6to4(struct in6_addr *v6dst)
|
static inline u32 try_6to4(struct in6_addr *v6dst)
|
{
|
{
|
u32 dst = 0;
|
u32 dst = 0;
|
|
|
if (v6dst->s6_addr16[0] == htons(0x2002)) {
|
if (v6dst->s6_addr16[0] == htons(0x2002)) {
|
/* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
|
/* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
|
memcpy(&dst, &v6dst->s6_addr16[1], 4);
|
memcpy(&dst, &v6dst->s6_addr16[1], 4);
|
}
|
}
|
return dst;
|
return dst;
|
}
|
}
|
|
|
/*
|
/*
|
* This function assumes it is being called from dev_queue_xmit()
|
* This function assumes it is being called from dev_queue_xmit()
|
* and that skb is filled properly by that function.
|
* and that skb is filled properly by that function.
|
*/
|
*/
|
|
|
static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
|
static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
|
{
|
{
|
struct ip_tunnel *tunnel = (struct ip_tunnel*)dev->priv;
|
struct ip_tunnel *tunnel = (struct ip_tunnel*)dev->priv;
|
struct net_device_stats *stats = &tunnel->stat;
|
struct net_device_stats *stats = &tunnel->stat;
|
struct iphdr *tiph = &tunnel->parms.iph;
|
struct iphdr *tiph = &tunnel->parms.iph;
|
struct ipv6hdr *iph6 = skb->nh.ipv6h;
|
struct ipv6hdr *iph6 = skb->nh.ipv6h;
|
u8 tos = tunnel->parms.iph.tos;
|
u8 tos = tunnel->parms.iph.tos;
|
struct rtable *rt; /* Route to the other host */
|
struct rtable *rt; /* Route to the other host */
|
struct net_device *tdev; /* Device to other host */
|
struct net_device *tdev; /* Device to other host */
|
struct iphdr *iph; /* Our new IP header */
|
struct iphdr *iph; /* Our new IP header */
|
int max_headroom; /* The extra header space needed */
|
int max_headroom; /* The extra header space needed */
|
u32 dst = tiph->daddr;
|
u32 dst = tiph->daddr;
|
int mtu;
|
int mtu;
|
struct in6_addr *addr6;
|
struct in6_addr *addr6;
|
int addr_type;
|
int addr_type;
|
|
|
if (tunnel->recursion++) {
|
if (tunnel->recursion++) {
|
tunnel->stat.collisions++;
|
tunnel->stat.collisions++;
|
goto tx_error;
|
goto tx_error;
|
}
|
}
|
|
|
if (skb->protocol != htons(ETH_P_IPV6))
|
if (skb->protocol != htons(ETH_P_IPV6))
|
goto tx_error;
|
goto tx_error;
|
|
|
if (!dst)
|
if (!dst)
|
dst = try_6to4(&iph6->daddr);
|
dst = try_6to4(&iph6->daddr);
|
|
|
if (!dst) {
|
if (!dst) {
|
struct neighbour *neigh = NULL;
|
struct neighbour *neigh = NULL;
|
|
|
if (skb->dst)
|
if (skb->dst)
|
neigh = skb->dst->neighbour;
|
neigh = skb->dst->neighbour;
|
|
|
if (neigh == NULL) {
|
if (neigh == NULL) {
|
if (net_ratelimit())
|
if (net_ratelimit())
|
printk(KERN_DEBUG "sit: nexthop == NULL\n");
|
printk(KERN_DEBUG "sit: nexthop == NULL\n");
|
goto tx_error;
|
goto tx_error;
|
}
|
}
|
|
|
addr6 = (struct in6_addr*)&neigh->primary_key;
|
addr6 = (struct in6_addr*)&neigh->primary_key;
|
addr_type = ipv6_addr_type(addr6);
|
addr_type = ipv6_addr_type(addr6);
|
|
|
if (addr_type == IPV6_ADDR_ANY) {
|
if (addr_type == IPV6_ADDR_ANY) {
|
addr6 = &skb->nh.ipv6h->daddr;
|
addr6 = &skb->nh.ipv6h->daddr;
|
addr_type = ipv6_addr_type(addr6);
|
addr_type = ipv6_addr_type(addr6);
|
}
|
}
|
|
|
if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
|
if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
|
goto tx_error_icmp;
|
goto tx_error_icmp;
|
|
|
dst = addr6->s6_addr32[3];
|
dst = addr6->s6_addr32[3];
|
}
|
}
|
|
|
if (ip_route_output(&rt, dst, tiph->saddr, RT_TOS(tos), tunnel->parms.link)) {
|
if (ip_route_output(&rt, dst, tiph->saddr, RT_TOS(tos), tunnel->parms.link)) {
|
tunnel->stat.tx_carrier_errors++;
|
tunnel->stat.tx_carrier_errors++;
|
goto tx_error_icmp;
|
goto tx_error_icmp;
|
}
|
}
|
if (rt->rt_type != RTN_UNICAST) {
|
if (rt->rt_type != RTN_UNICAST) {
|
tunnel->stat.tx_carrier_errors++;
|
tunnel->stat.tx_carrier_errors++;
|
goto tx_error_icmp;
|
goto tx_error_icmp;
|
}
|
}
|
tdev = rt->u.dst.dev;
|
tdev = rt->u.dst.dev;
|
|
|
if (tdev == dev) {
|
if (tdev == dev) {
|
ip_rt_put(rt);
|
ip_rt_put(rt);
|
tunnel->stat.collisions++;
|
tunnel->stat.collisions++;
|
goto tx_error;
|
goto tx_error;
|
}
|
}
|
|
|
if (tiph->frag_off)
|
if (tiph->frag_off)
|
mtu = rt->u.dst.pmtu - sizeof(struct iphdr);
|
mtu = rt->u.dst.pmtu - sizeof(struct iphdr);
|
else
|
else
|
mtu = skb->dst ? skb->dst->pmtu : dev->mtu;
|
mtu = skb->dst ? skb->dst->pmtu : dev->mtu;
|
|
|
if (mtu < 68) {
|
if (mtu < 68) {
|
tunnel->stat.collisions++;
|
tunnel->stat.collisions++;
|
ip_rt_put(rt);
|
ip_rt_put(rt);
|
goto tx_error;
|
goto tx_error;
|
}
|
}
|
if (mtu < IPV6_MIN_MTU)
|
if (mtu < IPV6_MIN_MTU)
|
mtu = IPV6_MIN_MTU;
|
mtu = IPV6_MIN_MTU;
|
if (skb->dst && mtu < skb->dst->pmtu) {
|
if (skb->dst && mtu < skb->dst->pmtu) {
|
struct rt6_info *rt6 = (struct rt6_info*)skb->dst;
|
struct rt6_info *rt6 = (struct rt6_info*)skb->dst;
|
if (mtu < rt6->u.dst.pmtu) {
|
if (mtu < rt6->u.dst.pmtu) {
|
if (tunnel->parms.iph.daddr || rt6->rt6i_dst.plen == 128) {
|
if (tunnel->parms.iph.daddr || rt6->rt6i_dst.plen == 128) {
|
rt6->rt6i_flags |= RTF_MODIFIED;
|
rt6->rt6i_flags |= RTF_MODIFIED;
|
rt6->u.dst.pmtu = mtu;
|
rt6->u.dst.pmtu = mtu;
|
}
|
}
|
}
|
}
|
}
|
}
|
if (skb->len > mtu) {
|
if (skb->len > mtu) {
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, dev);
|
ip_rt_put(rt);
|
ip_rt_put(rt);
|
goto tx_error;
|
goto tx_error;
|
}
|
}
|
|
|
if (tunnel->err_count > 0) {
|
if (tunnel->err_count > 0) {
|
if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
|
if (jiffies - tunnel->err_time < IPTUNNEL_ERR_TIMEO) {
|
tunnel->err_count--;
|
tunnel->err_count--;
|
dst_link_failure(skb);
|
dst_link_failure(skb);
|
} else
|
} else
|
tunnel->err_count = 0;
|
tunnel->err_count = 0;
|
}
|
}
|
|
|
/*
|
/*
|
* Okay, now see if we can stuff it in the buffer as-is.
|
* Okay, now see if we can stuff it in the buffer as-is.
|
*/
|
*/
|
max_headroom = (((tdev->hard_header_len+15)&~15)+sizeof(struct iphdr));
|
max_headroom = (((tdev->hard_header_len+15)&~15)+sizeof(struct iphdr));
|
|
|
if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
|
if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
|
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
|
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
|
if (!new_skb) {
|
if (!new_skb) {
|
ip_rt_put(rt);
|
ip_rt_put(rt);
|
stats->tx_dropped++;
|
stats->tx_dropped++;
|
dev_kfree_skb(skb);
|
dev_kfree_skb(skb);
|
tunnel->recursion--;
|
tunnel->recursion--;
|
return 0;
|
return 0;
|
}
|
}
|
if (skb->sk)
|
if (skb->sk)
|
skb_set_owner_w(new_skb, skb->sk);
|
skb_set_owner_w(new_skb, skb->sk);
|
dev_kfree_skb(skb);
|
dev_kfree_skb(skb);
|
skb = new_skb;
|
skb = new_skb;
|
iph6 = skb->nh.ipv6h;
|
iph6 = skb->nh.ipv6h;
|
}
|
}
|
|
|
skb->h.raw = skb->nh.raw;
|
skb->h.raw = skb->nh.raw;
|
skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
|
skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
dst_release(skb->dst);
|
dst_release(skb->dst);
|
skb->dst = &rt->u.dst;
|
skb->dst = &rt->u.dst;
|
|
|
/*
|
/*
|
* Push down and install the IPIP header.
|
* Push down and install the IPIP header.
|
*/
|
*/
|
|
|
iph = skb->nh.iph;
|
iph = skb->nh.iph;
|
iph->version = 4;
|
iph->version = 4;
|
iph->ihl = sizeof(struct iphdr)>>2;
|
iph->ihl = sizeof(struct iphdr)>>2;
|
if (mtu > IPV6_MIN_MTU)
|
if (mtu > IPV6_MIN_MTU)
|
iph->frag_off = htons(IP_DF);
|
iph->frag_off = htons(IP_DF);
|
else
|
else
|
iph->frag_off = 0;
|
iph->frag_off = 0;
|
|
|
iph->protocol = IPPROTO_IPV6;
|
iph->protocol = IPPROTO_IPV6;
|
iph->tos = INET_ECN_encapsulate(tos, ip6_get_dsfield(iph6));
|
iph->tos = INET_ECN_encapsulate(tos, ip6_get_dsfield(iph6));
|
iph->daddr = rt->rt_dst;
|
iph->daddr = rt->rt_dst;
|
iph->saddr = rt->rt_src;
|
iph->saddr = rt->rt_src;
|
|
|
if ((iph->ttl = tiph->ttl) == 0)
|
if ((iph->ttl = tiph->ttl) == 0)
|
iph->ttl = iph6->hop_limit;
|
iph->ttl = iph6->hop_limit;
|
|
|
#ifdef CONFIG_NETFILTER
|
#ifdef CONFIG_NETFILTER
|
nf_conntrack_put(skb->nfct);
|
nf_conntrack_put(skb->nfct);
|
skb->nfct = NULL;
|
skb->nfct = NULL;
|
#ifdef CONFIG_NETFILTER_DEBUG
|
#ifdef CONFIG_NETFILTER_DEBUG
|
skb->nf_debug = 0;
|
skb->nf_debug = 0;
|
#endif
|
#endif
|
#endif
|
#endif
|
|
|
IPTUNNEL_XMIT();
|
IPTUNNEL_XMIT();
|
tunnel->recursion--;
|
tunnel->recursion--;
|
return 0;
|
return 0;
|
|
|
tx_error_icmp:
|
tx_error_icmp:
|
dst_link_failure(skb);
|
dst_link_failure(skb);
|
tx_error:
|
tx_error:
|
stats->tx_errors++;
|
stats->tx_errors++;
|
dev_kfree_skb(skb);
|
dev_kfree_skb(skb);
|
tunnel->recursion--;
|
tunnel->recursion--;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
|
ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
|
{
|
{
|
int err = 0;
|
int err = 0;
|
struct ip_tunnel_parm p;
|
struct ip_tunnel_parm p;
|
struct ip_tunnel *t;
|
struct ip_tunnel *t;
|
|
|
MOD_INC_USE_COUNT;
|
MOD_INC_USE_COUNT;
|
|
|
switch (cmd) {
|
switch (cmd) {
|
case SIOCGETTUNNEL:
|
case SIOCGETTUNNEL:
|
t = NULL;
|
t = NULL;
|
if (dev == &ipip6_fb_tunnel_dev) {
|
if (dev == &ipip6_fb_tunnel_dev) {
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
|
err = -EFAULT;
|
err = -EFAULT;
|
break;
|
break;
|
}
|
}
|
t = ipip6_tunnel_locate(&p, 0);
|
t = ipip6_tunnel_locate(&p, 0);
|
}
|
}
|
if (t == NULL)
|
if (t == NULL)
|
t = (struct ip_tunnel*)dev->priv;
|
t = (struct ip_tunnel*)dev->priv;
|
memcpy(&p, &t->parms, sizeof(p));
|
memcpy(&p, &t->parms, sizeof(p));
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
|
err = -EFAULT;
|
err = -EFAULT;
|
break;
|
break;
|
|
|
case SIOCADDTUNNEL:
|
case SIOCADDTUNNEL:
|
case SIOCCHGTUNNEL:
|
case SIOCCHGTUNNEL:
|
err = -EPERM;
|
err = -EPERM;
|
if (!capable(CAP_NET_ADMIN))
|
if (!capable(CAP_NET_ADMIN))
|
goto done;
|
goto done;
|
|
|
err = -EFAULT;
|
err = -EFAULT;
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
goto done;
|
goto done;
|
|
|
err = -EINVAL;
|
err = -EINVAL;
|
if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
|
if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
|
p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
|
p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
|
goto done;
|
goto done;
|
if (p.iph.ttl)
|
if (p.iph.ttl)
|
p.iph.frag_off |= htons(IP_DF);
|
p.iph.frag_off |= htons(IP_DF);
|
|
|
t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
|
t = ipip6_tunnel_locate(&p, cmd == SIOCADDTUNNEL);
|
|
|
if (dev != &ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL &&
|
if (dev != &ipip6_fb_tunnel_dev && cmd == SIOCCHGTUNNEL &&
|
t != &ipip6_fb_tunnel) {
|
t != &ipip6_fb_tunnel) {
|
if (t != NULL) {
|
if (t != NULL) {
|
if (t->dev != dev) {
|
if (t->dev != dev) {
|
err = -EEXIST;
|
err = -EEXIST;
|
break;
|
break;
|
}
|
}
|
} else {
|
} else {
|
if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
|
if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
|
(!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
|
(!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
|
err = -EINVAL;
|
err = -EINVAL;
|
break;
|
break;
|
}
|
}
|
t = (struct ip_tunnel*)dev->priv;
|
t = (struct ip_tunnel*)dev->priv;
|
ipip6_tunnel_unlink(t);
|
ipip6_tunnel_unlink(t);
|
t->parms.iph.saddr = p.iph.saddr;
|
t->parms.iph.saddr = p.iph.saddr;
|
t->parms.iph.daddr = p.iph.daddr;
|
t->parms.iph.daddr = p.iph.daddr;
|
memcpy(dev->dev_addr, &p.iph.saddr, 4);
|
memcpy(dev->dev_addr, &p.iph.saddr, 4);
|
memcpy(dev->broadcast, &p.iph.daddr, 4);
|
memcpy(dev->broadcast, &p.iph.daddr, 4);
|
ipip6_tunnel_link(t);
|
ipip6_tunnel_link(t);
|
netdev_state_change(dev);
|
netdev_state_change(dev);
|
}
|
}
|
}
|
}
|
|
|
if (t) {
|
if (t) {
|
err = 0;
|
err = 0;
|
if (cmd == SIOCCHGTUNNEL) {
|
if (cmd == SIOCCHGTUNNEL) {
|
t->parms.iph.ttl = p.iph.ttl;
|
t->parms.iph.ttl = p.iph.ttl;
|
t->parms.iph.tos = p.iph.tos;
|
t->parms.iph.tos = p.iph.tos;
|
}
|
}
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
|
err = -EFAULT;
|
err = -EFAULT;
|
} else
|
} else
|
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
|
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
|
break;
|
break;
|
|
|
case SIOCDELTUNNEL:
|
case SIOCDELTUNNEL:
|
err = -EPERM;
|
err = -EPERM;
|
if (!capable(CAP_NET_ADMIN))
|
if (!capable(CAP_NET_ADMIN))
|
goto done;
|
goto done;
|
|
|
if (dev == &ipip6_fb_tunnel_dev) {
|
if (dev == &ipip6_fb_tunnel_dev) {
|
err = -EFAULT;
|
err = -EFAULT;
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
goto done;
|
goto done;
|
err = -ENOENT;
|
err = -ENOENT;
|
if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
|
if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
|
goto done;
|
goto done;
|
err = -EPERM;
|
err = -EPERM;
|
if (t == &ipip6_fb_tunnel)
|
if (t == &ipip6_fb_tunnel)
|
goto done;
|
goto done;
|
dev = t->dev;
|
dev = t->dev;
|
}
|
}
|
err = unregister_netdevice(dev);
|
err = unregister_netdevice(dev);
|
break;
|
break;
|
|
|
default:
|
default:
|
err = -EINVAL;
|
err = -EINVAL;
|
}
|
}
|
|
|
done:
|
done:
|
MOD_DEC_USE_COUNT;
|
MOD_DEC_USE_COUNT;
|
return err;
|
return err;
|
}
|
}
|
|
|
static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
|
static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
|
{
|
{
|
return &(((struct ip_tunnel*)dev->priv)->stat);
|
return &(((struct ip_tunnel*)dev->priv)->stat);
|
}
|
}
|
|
|
static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
|
static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
|
{
|
{
|
if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
|
if (new_mtu < IPV6_MIN_MTU || new_mtu > 0xFFF8 - sizeof(struct iphdr))
|
return -EINVAL;
|
return -EINVAL;
|
dev->mtu = new_mtu;
|
dev->mtu = new_mtu;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void ipip6_tunnel_init_gen(struct net_device *dev)
|
static void ipip6_tunnel_init_gen(struct net_device *dev)
|
{
|
{
|
struct ip_tunnel *t = (struct ip_tunnel*)dev->priv;
|
struct ip_tunnel *t = (struct ip_tunnel*)dev->priv;
|
|
|
dev->destructor = ipip6_tunnel_destructor;
|
dev->destructor = ipip6_tunnel_destructor;
|
dev->uninit = ipip6_tunnel_uninit;
|
dev->uninit = ipip6_tunnel_uninit;
|
dev->hard_start_xmit = ipip6_tunnel_xmit;
|
dev->hard_start_xmit = ipip6_tunnel_xmit;
|
dev->get_stats = ipip6_tunnel_get_stats;
|
dev->get_stats = ipip6_tunnel_get_stats;
|
dev->do_ioctl = ipip6_tunnel_ioctl;
|
dev->do_ioctl = ipip6_tunnel_ioctl;
|
dev->change_mtu = ipip6_tunnel_change_mtu;
|
dev->change_mtu = ipip6_tunnel_change_mtu;
|
|
|
dev->type = ARPHRD_SIT;
|
dev->type = ARPHRD_SIT;
|
dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
|
dev->hard_header_len = LL_MAX_HEADER + sizeof(struct iphdr);
|
dev->mtu = 1500 - sizeof(struct iphdr);
|
dev->mtu = 1500 - sizeof(struct iphdr);
|
dev->flags = IFF_NOARP;
|
dev->flags = IFF_NOARP;
|
dev->iflink = 0;
|
dev->iflink = 0;
|
dev->addr_len = 4;
|
dev->addr_len = 4;
|
memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
|
memcpy(dev->dev_addr, &t->parms.iph.saddr, 4);
|
memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
|
memcpy(dev->broadcast, &t->parms.iph.daddr, 4);
|
}
|
}
|
|
|
static int ipip6_tunnel_init(struct net_device *dev)
|
static int ipip6_tunnel_init(struct net_device *dev)
|
{
|
{
|
struct net_device *tdev = NULL;
|
struct net_device *tdev = NULL;
|
struct ip_tunnel *tunnel;
|
struct ip_tunnel *tunnel;
|
struct iphdr *iph;
|
struct iphdr *iph;
|
|
|
tunnel = (struct ip_tunnel*)dev->priv;
|
tunnel = (struct ip_tunnel*)dev->priv;
|
iph = &tunnel->parms.iph;
|
iph = &tunnel->parms.iph;
|
|
|
ipip6_tunnel_init_gen(dev);
|
ipip6_tunnel_init_gen(dev);
|
|
|
if (iph->daddr) {
|
if (iph->daddr) {
|
struct rtable *rt;
|
struct rtable *rt;
|
if (!ip_route_output(&rt, iph->daddr, iph->saddr, RT_TOS(iph->tos), tunnel->parms.link)) {
|
if (!ip_route_output(&rt, iph->daddr, iph->saddr, RT_TOS(iph->tos), tunnel->parms.link)) {
|
tdev = rt->u.dst.dev;
|
tdev = rt->u.dst.dev;
|
ip_rt_put(rt);
|
ip_rt_put(rt);
|
}
|
}
|
dev->flags |= IFF_POINTOPOINT;
|
dev->flags |= IFF_POINTOPOINT;
|
}
|
}
|
|
|
if (!tdev && tunnel->parms.link)
|
if (!tdev && tunnel->parms.link)
|
tdev = __dev_get_by_index(tunnel->parms.link);
|
tdev = __dev_get_by_index(tunnel->parms.link);
|
|
|
if (tdev) {
|
if (tdev) {
|
dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
|
dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
|
dev->mtu = tdev->mtu - sizeof(struct iphdr);
|
dev->mtu = tdev->mtu - sizeof(struct iphdr);
|
if (dev->mtu < IPV6_MIN_MTU)
|
if (dev->mtu < IPV6_MIN_MTU)
|
dev->mtu = IPV6_MIN_MTU;
|
dev->mtu = IPV6_MIN_MTU;
|
}
|
}
|
dev->iflink = tunnel->parms.link;
|
dev->iflink = tunnel->parms.link;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
#ifdef MODULE
|
#ifdef MODULE
|
static int ipip6_fb_tunnel_open(struct net_device *dev)
|
static int ipip6_fb_tunnel_open(struct net_device *dev)
|
{
|
{
|
MOD_INC_USE_COUNT;
|
MOD_INC_USE_COUNT;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int ipip6_fb_tunnel_close(struct net_device *dev)
|
static int ipip6_fb_tunnel_close(struct net_device *dev)
|
{
|
{
|
MOD_DEC_USE_COUNT;
|
MOD_DEC_USE_COUNT;
|
return 0;
|
return 0;
|
}
|
}
|
#endif
|
#endif
|
|
|
int __init ipip6_fb_tunnel_init(struct net_device *dev)
|
int __init ipip6_fb_tunnel_init(struct net_device *dev)
|
{
|
{
|
struct iphdr *iph;
|
struct iphdr *iph;
|
|
|
ipip6_tunnel_init_gen(dev);
|
ipip6_tunnel_init_gen(dev);
|
#ifdef MODULE
|
#ifdef MODULE
|
dev->open = ipip6_fb_tunnel_open;
|
dev->open = ipip6_fb_tunnel_open;
|
dev->stop = ipip6_fb_tunnel_close;
|
dev->stop = ipip6_fb_tunnel_close;
|
#endif
|
#endif
|
|
|
iph = &ipip6_fb_tunnel.parms.iph;
|
iph = &ipip6_fb_tunnel.parms.iph;
|
iph->version = 4;
|
iph->version = 4;
|
iph->protocol = IPPROTO_IPV6;
|
iph->protocol = IPPROTO_IPV6;
|
iph->ihl = 5;
|
iph->ihl = 5;
|
iph->ttl = 64;
|
iph->ttl = 64;
|
|
|
dev_hold(dev);
|
dev_hold(dev);
|
tunnels_wc[0] = &ipip6_fb_tunnel;
|
tunnels_wc[0] = &ipip6_fb_tunnel;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static struct inet_protocol sit_protocol = {
|
static struct inet_protocol sit_protocol = {
|
ipip6_rcv,
|
ipip6_rcv,
|
ipip6_err,
|
ipip6_err,
|
0,
|
0,
|
IPPROTO_IPV6,
|
IPPROTO_IPV6,
|
0,
|
0,
|
NULL,
|
NULL,
|
"IPv6"
|
"IPv6"
|
};
|
};
|
|
|
#ifdef MODULE
|
#ifdef MODULE
|
void sit_cleanup(void)
|
void sit_cleanup(void)
|
{
|
{
|
inet_del_protocol(&sit_protocol);
|
inet_del_protocol(&sit_protocol);
|
unregister_netdev(&ipip6_fb_tunnel_dev);
|
unregister_netdev(&ipip6_fb_tunnel_dev);
|
}
|
}
|
#endif
|
#endif
|
|
|
int __init sit_init(void)
|
int __init sit_init(void)
|
{
|
{
|
printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
|
printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
|
|
|
ipip6_fb_tunnel_dev.priv = (void*)&ipip6_fb_tunnel;
|
ipip6_fb_tunnel_dev.priv = (void*)&ipip6_fb_tunnel;
|
strcpy(ipip6_fb_tunnel_dev.name, ipip6_fb_tunnel.parms.name);
|
strcpy(ipip6_fb_tunnel_dev.name, ipip6_fb_tunnel.parms.name);
|
register_netdev(&ipip6_fb_tunnel_dev);
|
register_netdev(&ipip6_fb_tunnel_dev);
|
inet_add_protocol(&sit_protocol);
|
inet_add_protocol(&sit_protocol);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
