* Linux INET6 implementation
*
* Authors:
- * Pedro Roque <roque@di.fc.ul.pt>
+ * Pedro Roque <roque@di.fc.ul.pt>
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
*
* $Id: sit.c,v 1.53 2001/09/25 05:09:53 davem Exp $
* Nate Thompson <nate@thebog.net>: 6to4 support
*/
-#include <linux/config.h>
#include <linux/module.h>
+#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
-#include <linux/sched.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
*/
#define HASH_SIZE 16
-#define HASH(addr) ((addr^(addr>>4))&0xF)
+#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
static int ipip6_fb_tunnel_init(struct net_device *dev);
static int ipip6_tunnel_init(struct net_device *dev);
static DEFINE_RWLOCK(ipip6_lock);
-static struct ip_tunnel * ipip6_tunnel_lookup(u32 remote, u32 local)
+static struct ip_tunnel * ipip6_tunnel_lookup(__be32 remote, __be32 local)
{
unsigned h0 = HASH(remote);
unsigned h1 = HASH(local);
return NULL;
}
-static struct ip_tunnel ** ipip6_bucket(struct ip_tunnel *t)
+static struct ip_tunnel **__ipip6_bucket(struct ip_tunnel_parm *parms)
{
- u32 remote = t->parms.iph.daddr;
- u32 local = t->parms.iph.saddr;
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
unsigned h = 0;
int prio = 0;
return &tunnels[prio][h];
}
+static inline struct ip_tunnel **ipip6_bucket(struct ip_tunnel *t)
+{
+ return __ipip6_bucket(&t->parms);
+}
+
static void ipip6_tunnel_unlink(struct ip_tunnel *t)
{
struct ip_tunnel **tp;
static struct ip_tunnel * ipip6_tunnel_locate(struct ip_tunnel_parm *parms, int create)
{
- u32 remote = parms->iph.daddr;
- u32 local = parms->iph.saddr;
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
struct ip_tunnel *t, **tp, *nt;
struct net_device *dev;
- unsigned h = 0;
- int prio = 0;
char name[IFNAMSIZ];
- if (remote) {
- prio |= 2;
- h ^= HASH(remote);
- }
- if (local) {
- prio |= 1;
- h ^= HASH(local);
- }
- for (tp = &tunnels[prio][h]; (t = *tp) != NULL; tp = &t->next) {
+ for (tp = __ipip6_bucket(parms); (t = *tp) != NULL; tp = &t->next) {
if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
return t;
}
if (dev == NULL)
return NULL;
- nt = dev->priv;
+ nt = netdev_priv(dev);
dev->init = ipip6_tunnel_init;
nt->parms = *parms;
write_unlock_bh(&ipip6_lock);
dev_put(dev);
} else {
- ipip6_tunnel_unlink((struct ip_tunnel*)dev->priv);
+ ipip6_tunnel_unlink(netdev_priv(dev));
dev_put(dev);
}
}
-static void ipip6_err(struct sk_buff *skb, u32 info)
+static int ipip6_err(struct sk_buff *skb, u32 info)
{
#ifndef I_WISH_WORLD_WERE_PERFECT
ICMP in the real Internet is absolutely infeasible.
*/
struct iphdr *iph = (struct iphdr*)skb->data;
- int type = skb->h.icmph->type;
- int code = skb->h.icmph->code;
+ const int type = icmp_hdr(skb)->type;
+ const int code = icmp_hdr(skb)->code;
struct ip_tunnel *t;
+ int err;
switch (type) {
default:
case ICMP_PARAMETERPROB:
- return;
+ return 0;
case ICMP_DEST_UNREACH:
switch (code) {
case ICMP_SR_FAILED:
case ICMP_PORT_UNREACH:
/* Impossible event. */
- return;
+ return 0;
case ICMP_FRAG_NEEDED:
/* Soft state for pmtu is maintained by IP core. */
- return;
+ return 0;
default:
/* All others are translated to HOST_UNREACH.
rfc2003 contains "deep thoughts" about NET_UNREACH,
break;
case ICMP_TIME_EXCEEDED:
if (code != ICMP_EXC_TTL)
- return;
+ return 0;
break;
}
+ err = -ENOENT;
+
read_lock(&ipip6_lock);
t = ipip6_tunnel_lookup(iph->daddr, iph->saddr);
if (t == NULL || t->parms.iph.daddr == 0)
goto out;
+
+ err = 0;
if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
goto out;
t->err_time = jiffies;
out:
read_unlock(&ipip6_lock);
- return;
+ return err;
#else
struct iphdr *iph = (struct iphdr*)dp;
int hlen = iph->ihl<<2;
struct ipv6hdr *iph6;
- int type = skb->h.icmph->type;
- int code = skb->h.icmph->code;
+ const int type = icmp_hdr(skb)->type;
+ const int code = icmp_hdr(skb)->code;
int rel_type = 0;
int rel_code = 0;
int rel_info = 0;
default:
return;
case ICMP_PARAMETERPROB:
- if (skb->h.icmph->un.gateway < hlen)
+ if (icmp_hdr(skb)->un.gateway < hlen)
return;
/* So... This guy found something strange INSIDE encapsulated
packet. Well, he is fool, but what can we do ?
*/
rel_type = ICMPV6_PARAMPROB;
- rel_info = skb->h.icmph->un.gateway - hlen;
+ rel_info = icmp_hdr(skb)->un.gateway - hlen;
break;
case ICMP_DEST_UNREACH:
/* Prepare fake skb to feed it to icmpv6_send */
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb2 == NULL)
- return;
+ return 0;
dst_release(skb2->dst);
skb2->dst = NULL;
skb_pull(skb2, skb->data - (u8*)iph6);
- skb2->nh.raw = skb2->data;
+ skb_reset_network_header(skb2);
/* Try to guess incoming interface */
rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0);
rt6i = rt6_lookup(&iph6->daddr, &iph6->saddr, NULL, 0);
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 = netdev_priv(rt6i->rt6i_dev);
if (rel_type == ICMPV6_TIME_EXCEED && t->parms.iph.ttl) {
rel_type = ICMPV6_DEST_UNREACH;
rel_code = ICMPV6_ADDR_UNREACH;
}
}
kfree_skb(skb2);
- return;
+ return 0;
#endif
}
static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
{
if (INET_ECN_is_ce(iph->tos))
- IP6_ECN_set_ce(skb->nh.ipv6h);
+ IP6_ECN_set_ce(ipv6_hdr(skb));
}
static int ipip6_rcv(struct sk_buff *skb)
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto out;
- iph = skb->nh.iph;
+ iph = ip_hdr(skb);
read_lock(&ipip6_lock);
if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
secpath_reset(skb);
- skb->mac.raw = skb->nh.raw;
- skb->nh.raw = skb->data;
- memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
+ skb->mac_header = skb->network_header;
+ skb_reset_network_header(skb);
+ IPCB(skb)->flags = 0;
skb->protocol = htons(ETH_P_IPV6);
skb->pkt_type = PACKET_HOST;
tunnel->stat.rx_packets++;
return 0;
}
- icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PROT_UNREACH, 0);
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
kfree_skb(skb);
read_unlock(&ipip6_lock);
out:
/* Returns the embedded IPv4 address if the IPv6 address
comes from 6to4 (RFC 3056) addr space */
-static inline u32 try_6to4(struct in6_addr *v6dst)
+static inline __be32 try_6to4(struct in6_addr *v6dst)
{
- u32 dst = 0;
+ __be32 dst = 0;
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);
}
return dst;
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 = netdev_priv(dev);
struct net_device_stats *stats = &tunnel->stat;
struct iphdr *tiph = &tunnel->parms.iph;
- struct ipv6hdr *iph6 = skb->nh.ipv6h;
+ struct ipv6hdr *iph6 = ipv6_hdr(skb);
u8 tos = tunnel->parms.iph.tos;
struct rtable *rt; /* Route to the other host */
struct net_device *tdev; /* Device to other host */
struct iphdr *iph; /* Our new IP header */
int max_headroom; /* The extra header space needed */
- u32 dst = tiph->daddr;
+ __be32 dst = tiph->daddr;
int mtu;
- struct in6_addr *addr6;
+ struct in6_addr *addr6;
int addr_type;
if (tunnel->recursion++) {
addr_type = ipv6_addr_type(addr6);
if (addr_type == IPV6_ADDR_ANY) {
- addr6 = &skb->nh.ipv6h->daddr;
+ addr6 = &ipv6_hdr(skb)->daddr;
addr_type = ipv6_addr_type(addr6);
}
*/
max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
- if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
+ if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
+ (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
if (!new_skb) {
ip_rt_put(rt);
- stats->tx_dropped++;
+ stats->tx_dropped++;
dev_kfree_skb(skb);
tunnel->recursion--;
return 0;
skb_set_owner_w(new_skb, skb->sk);
dev_kfree_skb(skb);
skb = new_skb;
- iph6 = skb->nh.ipv6h;
+ iph6 = ipv6_hdr(skb);
}
- skb->h.raw = skb->nh.raw;
- skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
+ skb->transport_header = skb->network_header;
+ skb_push(skb, sizeof(struct iphdr));
+ skb_reset_network_header(skb);
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
+ IPCB(skb)->flags = 0;
dst_release(skb->dst);
skb->dst = &rt->u.dst;
* Push down and install the IPIP header.
*/
- iph = skb->nh.iph;
+ iph = ip_hdr(skb);
iph->version = 4;
iph->ihl = sizeof(struct iphdr)>>2;
if (mtu > IPV6_MIN_MTU)
t = ipip6_tunnel_locate(&p, 0);
}
if (t == NULL)
- t = (struct ip_tunnel*)dev->priv;
+ t = netdev_priv(dev);
memcpy(&p, &t->parms, sizeof(p));
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
err = -EFAULT;
err = -EINVAL;
break;
}
- t = (struct ip_tunnel*)dev->priv;
+ t = netdev_priv(dev);
ipip6_tunnel_unlink(t);
t->parms.iph.saddr = p.iph.saddr;
t->parms.iph.daddr = p.iph.daddr;
if ((t = ipip6_tunnel_locate(&p, 0)) == NULL)
goto done;
err = -EPERM;
- if (t == ipip6_fb_tunnel_dev->priv)
+ if (t == netdev_priv(ipip6_fb_tunnel_dev))
goto done;
dev = t->dev;
}
- err = unregister_netdevice(dev);
+ unregister_netdevice(dev);
+ err = 0;
break;
default:
static struct net_device_stats *ipip6_tunnel_get_stats(struct net_device *dev)
{
- return &(((struct ip_tunnel*)dev->priv)->stat);
+ return &(((struct ip_tunnel*)netdev_priv(dev))->stat);
}
static int ipip6_tunnel_change_mtu(struct net_device *dev, int new_mtu)
struct ip_tunnel *tunnel;
struct iphdr *iph;
- tunnel = (struct ip_tunnel*)dev->priv;
+ tunnel = netdev_priv(dev);
iph = &tunnel->parms.iph;
tunnel->dev = dev;
static int __init ipip6_fb_tunnel_init(struct net_device *dev)
{
- struct ip_tunnel *tunnel = dev->priv;
+ struct ip_tunnel *tunnel = netdev_priv(dev);
struct iphdr *iph = &tunnel->parms.iph;
tunnel->dev = dev;
return 0;
}
-static struct net_protocol sit_protocol = {
+static struct xfrm_tunnel sit_handler = {
.handler = ipip6_rcv,
.err_handler = ipip6_err,
+ .priority = 1,
};
static void __exit sit_destroy_tunnels(void)
}
}
-void __exit sit_cleanup(void)
+static void __exit sit_cleanup(void)
{
- inet_del_protocol(&sit_protocol, IPPROTO_IPV6);
+ xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
rtnl_lock();
sit_destroy_tunnels();
rtnl_unlock();
}
-int __init sit_init(void)
+static int __init sit_init(void)
{
int err;
printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");
- if (inet_add_protocol(&sit_protocol, IPPROTO_IPV6) < 0) {
+ if (xfrm4_tunnel_register(&sit_handler, AF_INET6) < 0) {
printk(KERN_INFO "sit init: Can't add protocol\n");
return -EAGAIN;
}
- ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
+ ipip6_fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
ipip6_tunnel_setup);
if (!ipip6_fb_tunnel_dev) {
err = -ENOMEM;
err2:
free_netdev(ipip6_fb_tunnel_dev);
err1:
- inet_del_protocol(&sit_protocol, IPPROTO_IPV6);
+ xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
goto out;
}
+
+module_init(sit_init);
+module_exit(sit_cleanup);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("sit0");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff