sit.c 28.9 KB
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/*
 *	IPv6 over IPv4 tunnel device - Simple Internet Transition (SIT)
 *	Linux INET6 implementation
 *
 *	Authors:
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 *	Pedro Roque		<roque@di.fc.ul.pt>
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 *	Alexey Kuznetsov	<kuznet@ms2.inr.ac.ru>
 *
 *	This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 *	Changes:
 * Roger Venning <r.venning@telstra.com>:	6to4 support
 * Nate Thompson <nate@thebog.net>:		6to4 support
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 * Fred Templin <fred.l.templin@boeing.com>:	isatap support
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 */

#include <linux/module.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/icmp.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
#include <linux/init.h>
#include <linux/netfilter_ipv4.h>
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#include <linux/if_ether.h>
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#include <net/sock.h>
#include <net/snmp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/ip6_fib.h>
#include <net/ip6_route.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/ip.h>
#include <net/udp.h>
#include <net/icmp.h>
#include <net/ipip.h>
#include <net/inet_ecn.h>
#include <net/xfrm.h>
#include <net/dsfield.h>
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#include <net/net_namespace.h>
#include <net/netns/generic.h>
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/*
   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
 */

#define HASH_SIZE  16
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#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
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static int ipip6_tunnel_init(struct net_device *dev);
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static void ipip6_tunnel_setup(struct net_device *dev);
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static void ipip6_dev_free(struct net_device *dev);
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static int sit_net_id __read_mostly;
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struct sit_net {
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	struct ip_tunnel __rcu *tunnels_r_l[HASH_SIZE];
	struct ip_tunnel __rcu *tunnels_r[HASH_SIZE];
	struct ip_tunnel __rcu *tunnels_l[HASH_SIZE];
	struct ip_tunnel __rcu *tunnels_wc[1];
	struct ip_tunnel __rcu **tunnels[4];
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	struct net_device *fb_tunnel_dev;
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};

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/*
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 * Locking : hash tables are protected by RCU and RTNL
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 */

#define for_each_ip_tunnel_rcu(start) \
	for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
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/* often modified stats are per cpu, other are shared (netdev->stats) */
struct pcpu_tstats {
	unsigned long	rx_packets;
	unsigned long	rx_bytes;
	unsigned long	tx_packets;
	unsigned long	tx_bytes;
};

static struct net_device_stats *ipip6_get_stats(struct net_device *dev)
{
	struct pcpu_tstats sum = { 0 };
	int i;

	for_each_possible_cpu(i) {
		const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);

		sum.rx_packets += tstats->rx_packets;
		sum.rx_bytes   += tstats->rx_bytes;
		sum.tx_packets += tstats->tx_packets;
		sum.tx_bytes   += tstats->tx_bytes;
	}
	dev->stats.rx_packets = sum.rx_packets;
	dev->stats.rx_bytes   = sum.rx_bytes;
	dev->stats.tx_packets = sum.tx_packets;
	dev->stats.tx_bytes   = sum.tx_bytes;
	return &dev->stats;
}
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/*
 * Must be invoked with rcu_read_lock
 */
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static struct ip_tunnel * ipip6_tunnel_lookup(struct net *net,
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		struct net_device *dev, __be32 remote, __be32 local)
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{
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	unsigned int h0 = HASH(remote);
	unsigned int h1 = HASH(local);
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	struct ip_tunnel *t;
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	struct sit_net *sitn = net_generic(net, sit_net_id);
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	for_each_ip_tunnel_rcu(sitn->tunnels_r_l[h0 ^ h1]) {
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		if (local == t->parms.iph.saddr &&
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		    remote == t->parms.iph.daddr &&
		    (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
		    (t->dev->flags & IFF_UP))
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			return t;
	}
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	for_each_ip_tunnel_rcu(sitn->tunnels_r[h0]) {
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		if (remote == t->parms.iph.daddr &&
		    (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
		    (t->dev->flags & IFF_UP))
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			return t;
	}
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	for_each_ip_tunnel_rcu(sitn->tunnels_l[h1]) {
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		if (local == t->parms.iph.saddr &&
		    (!dev || !t->parms.link || dev->iflink == t->parms.link) &&
		    (t->dev->flags & IFF_UP))
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			return t;
	}
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	t = rcu_dereference(sitn->tunnels_wc[0]);
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	if ((t != NULL) && (t->dev->flags & IFF_UP))
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		return t;
	return NULL;
}

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static struct ip_tunnel __rcu **__ipip6_bucket(struct sit_net *sitn,
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		struct ip_tunnel_parm *parms)
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{
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	__be32 remote = parms->iph.daddr;
	__be32 local = parms->iph.saddr;
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	unsigned int h = 0;
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	int prio = 0;

	if (remote) {
		prio |= 2;
		h ^= HASH(remote);
	}
	if (local) {
		prio |= 1;
		h ^= HASH(local);
	}
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	return &sitn->tunnels[prio][h];
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}

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static inline struct ip_tunnel __rcu **ipip6_bucket(struct sit_net *sitn,
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		struct ip_tunnel *t)
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{
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	return __ipip6_bucket(sitn, &t->parms);
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}

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static void ipip6_tunnel_unlink(struct sit_net *sitn, struct ip_tunnel *t)
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{
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	struct ip_tunnel __rcu **tp;
	struct ip_tunnel *iter;

	for (tp = ipip6_bucket(sitn, t);
	     (iter = rtnl_dereference(*tp)) != NULL;
	     tp = &iter->next) {
		if (t == iter) {
			rcu_assign_pointer(*tp, t->next);
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			break;
		}
	}
}

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static void ipip6_tunnel_link(struct sit_net *sitn, struct ip_tunnel *t)
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{
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	struct ip_tunnel __rcu **tp = ipip6_bucket(sitn, t);
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	rcu_assign_pointer(t->next, rtnl_dereference(*tp));
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	rcu_assign_pointer(*tp, t);
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}

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static void ipip6_tunnel_clone_6rd(struct net_device *dev, struct sit_net *sitn)
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{
#ifdef CONFIG_IPV6_SIT_6RD
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	struct ip_tunnel *t = netdev_priv(dev);

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	if (t->dev == sitn->fb_tunnel_dev) {
		ipv6_addr_set(&t->ip6rd.prefix, htonl(0x20020000), 0, 0, 0);
		t->ip6rd.relay_prefix = 0;
		t->ip6rd.prefixlen = 16;
		t->ip6rd.relay_prefixlen = 0;
	} else {
		struct ip_tunnel *t0 = netdev_priv(sitn->fb_tunnel_dev);
		memcpy(&t->ip6rd, &t0->ip6rd, sizeof(t->ip6rd));
	}
#endif
}

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static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
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		struct ip_tunnel_parm *parms, int create)
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{
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	__be32 remote = parms->iph.daddr;
	__be32 local = parms->iph.saddr;
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	struct ip_tunnel *t, *nt;
	struct ip_tunnel __rcu **tp;
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	struct net_device *dev;
	char name[IFNAMSIZ];
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	struct sit_net *sitn = net_generic(net, sit_net_id);
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	for (tp = __ipip6_bucket(sitn, parms);
	    (t = rtnl_dereference(*tp)) != NULL;
	     tp = &t->next) {
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		if (local == t->parms.iph.saddr &&
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		    remote == t->parms.iph.daddr &&
		    parms->link == t->parms.link) {
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			if (create)
				return NULL;
			else
				return t;
		}
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	}
	if (!create)
		goto failed;

	if (parms->name[0])
		strlcpy(name, parms->name, IFNAMSIZ);
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	else
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		strcpy(name, "sit%d");
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	dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
	if (dev == NULL)
		return NULL;

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	dev_net_set(dev, net);

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	if (strchr(name, '%')) {
		if (dev_alloc_name(dev, name) < 0)
			goto failed_free;
	}

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	nt = netdev_priv(dev);
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	nt->parms = *parms;
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	if (ipip6_tunnel_init(dev) < 0)
		goto failed_free;
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	ipip6_tunnel_clone_6rd(dev, sitn);
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	if (parms->i_flags & SIT_ISATAP)
		dev->priv_flags |= IFF_ISATAP;

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	if (register_netdevice(dev) < 0)
		goto failed_free;
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	dev_hold(dev);

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	ipip6_tunnel_link(sitn, nt);
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	return nt;

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failed_free:
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	ipip6_dev_free(dev);
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failed:
	return NULL;
}

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#define for_each_prl_rcu(start)			\
	for (prl = rcu_dereference(start);	\
	     prl;				\
	     prl = rcu_dereference(prl->next))

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static struct ip_tunnel_prl_entry *
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__ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
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{
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	struct ip_tunnel_prl_entry *prl;
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	for_each_prl_rcu(t->prl)
		if (prl->addr == addr)
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			break;
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	return prl;
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}

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static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
				struct ip_tunnel_prl __user *a)
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{
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	struct ip_tunnel_prl kprl, *kp;
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	struct ip_tunnel_prl_entry *prl;
	unsigned int cmax, c = 0, ca, len;
	int ret = 0;

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	if (copy_from_user(&kprl, a, sizeof(kprl)))
		return -EFAULT;
	cmax = kprl.datalen / sizeof(kprl);
	if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
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		cmax = 1;

	/* For simple GET or for root users,
	 * we try harder to allocate.
	 */
	kp = (cmax <= 1 || capable(CAP_NET_ADMIN)) ?
		kcalloc(cmax, sizeof(*kp), GFP_KERNEL) :
		NULL;

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	rcu_read_lock();
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	ca = t->prl_count < cmax ? t->prl_count : cmax;

	if (!kp) {
		/* We don't try hard to allocate much memory for
		 * non-root users.
		 * For root users, retry allocating enough memory for
		 * the answer.
		 */
		kp = kcalloc(ca, sizeof(*kp), GFP_ATOMIC);
		if (!kp) {
			ret = -ENOMEM;
			goto out;
		}
	}

	c = 0;
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	for_each_prl_rcu(t->prl) {
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		if (c >= cmax)
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			break;
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		if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
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			continue;
		kp[c].addr = prl->addr;
		kp[c].flags = prl->flags;
		c++;
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		if (kprl.addr != htonl(INADDR_ANY))
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			break;
	}
out:
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	rcu_read_unlock();
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	len = sizeof(*kp) * c;
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	ret = 0;
	if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
		ret = -EFAULT;
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	kfree(kp);

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	return ret;
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}

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static int
ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
{
	struct ip_tunnel_prl_entry *p;
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	int err = 0;

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	if (a->addr == htonl(INADDR_ANY))
		return -EINVAL;

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	ASSERT_RTNL();
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	for (p = rtnl_dereference(t->prl); p; p = rtnl_dereference(p->next)) {
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		if (p->addr == a->addr) {
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			if (chg) {
				p->flags = a->flags;
				goto out;
			}
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			err = -EEXIST;
			goto out;
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		}
	}

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	if (chg) {
		err = -ENXIO;
		goto out;
	}
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	p = kzalloc(sizeof(struct ip_tunnel_prl_entry), GFP_KERNEL);
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	if (!p) {
		err = -ENOBUFS;
		goto out;
	}
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	p->next = t->prl;
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	p->addr = a->addr;
	p->flags = a->flags;
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	t->prl_count++;
	rcu_assign_pointer(t->prl, p);
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out:
	return err;
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}

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static void prl_entry_destroy_rcu(struct rcu_head *head)
{
	kfree(container_of(head, struct ip_tunnel_prl_entry, rcu_head));
}

static void prl_list_destroy_rcu(struct rcu_head *head)
{
	struct ip_tunnel_prl_entry *p, *n;

	p = container_of(head, struct ip_tunnel_prl_entry, rcu_head);
	do {
		n = p->next;
		kfree(p);
		p = n;
	} while (p);
}

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static int
ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
{
	struct ip_tunnel_prl_entry *x, **p;
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	int err = 0;

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	ASSERT_RTNL();
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	if (a && a->addr != htonl(INADDR_ANY)) {
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		for (p = &t->prl; *p; p = &(*p)->next) {
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			if ((*p)->addr == a->addr) {
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				x = *p;
				*p = x->next;
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				call_rcu(&x->rcu_head, prl_entry_destroy_rcu);
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				t->prl_count--;
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				goto out;
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			}
		}
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		err = -ENXIO;
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	} else {
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		if (t->prl) {
			t->prl_count = 0;
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			x = t->prl;
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			call_rcu(&x->rcu_head, prl_list_destroy_rcu);
			t->prl = NULL;
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		}
	}
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out:
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	return err;
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}

static int
isatap_chksrc(struct sk_buff *skb, struct iphdr *iph, struct ip_tunnel *t)
{
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	struct ip_tunnel_prl_entry *p;
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	int ok = 1;

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	rcu_read_lock();
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	p = __ipip6_tunnel_locate_prl(t, iph->saddr);
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	if (p) {
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		if (p->flags & PRL_DEFAULT)
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			skb->ndisc_nodetype = NDISC_NODETYPE_DEFAULT;
		else
			skb->ndisc_nodetype = NDISC_NODETYPE_NODEFAULT;
	} else {
		struct in6_addr *addr6 = &ipv6_hdr(skb)->saddr;
		if (ipv6_addr_is_isatap(addr6) &&
		    (addr6->s6_addr32[3] == iph->saddr) &&
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		    ipv6_chk_prefix(addr6, t->dev))
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			skb->ndisc_nodetype = NDISC_NODETYPE_HOST;
		else
			ok = 0;
	}
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	rcu_read_unlock();
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	return ok;
}

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static void ipip6_tunnel_uninit(struct net_device *dev)
{
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	struct net *net = dev_net(dev);
	struct sit_net *sitn = net_generic(net, sit_net_id);

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	if (dev == sitn->fb_tunnel_dev) {
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		rcu_assign_pointer(sitn->tunnels_wc[0], NULL);
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	} else {
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		ipip6_tunnel_unlink(sitn, netdev_priv(dev));
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		ipip6_tunnel_del_prl(netdev_priv(dev), NULL);
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	}
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	dev_put(dev);
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}


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static int ipip6_err(struct sk_buff *skb, u32 info)
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{

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/* All the routers (except for Linux) return only
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   8 bytes of packet payload. It means, that precise relaying of
   ICMP in the real Internet is absolutely infeasible.
 */
	struct iphdr *iph = (struct iphdr*)skb->data;
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	const int type = icmp_hdr(skb)->type;
	const int code = icmp_hdr(skb)->code;
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	struct ip_tunnel *t;
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	int err;
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	switch (type) {
	default:
	case ICMP_PARAMETERPROB:
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		return 0;
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	case ICMP_DEST_UNREACH:
		switch (code) {
		case ICMP_SR_FAILED:
		case ICMP_PORT_UNREACH:
			/* Impossible event. */
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			return 0;
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		case ICMP_FRAG_NEEDED:
			/* Soft state for pmtu is maintained by IP core. */
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			return 0;
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		default:
			/* All others are translated to HOST_UNREACH.
			   rfc2003 contains "deep thoughts" about NET_UNREACH,
			   I believe they are just ether pollution. --ANK
			 */
			break;
		}
		break;
	case ICMP_TIME_EXCEEDED:
		if (code != ICMP_EXC_TTL)
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			return 0;
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		break;
	}

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	err = -ENOENT;

E
Eric Dumazet 已提交
536
	rcu_read_lock();
537 538 539 540
	t = ipip6_tunnel_lookup(dev_net(skb->dev),
				skb->dev,
				iph->daddr,
				iph->saddr);
L
Linus Torvalds 已提交
541 542
	if (t == NULL || t->parms.iph.daddr == 0)
		goto out;
543 544

	err = 0;
L
Linus Torvalds 已提交
545 546 547
	if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
		goto out;

548
	if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
L
Linus Torvalds 已提交
549 550 551 552 553
		t->err_count++;
	else
		t->err_count = 1;
	t->err_time = jiffies;
out:
E
Eric Dumazet 已提交
554
	rcu_read_unlock();
555
	return err;
L
Linus Torvalds 已提交
556 557 558 559 560
}

static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
{
	if (INET_ECN_is_ce(iph->tos))
561
		IP6_ECN_set_ce(ipv6_hdr(skb));
L
Linus Torvalds 已提交
562 563 564 565 566 567 568 569 570 571
}

static int ipip6_rcv(struct sk_buff *skb)
{
	struct iphdr *iph;
	struct ip_tunnel *tunnel;

	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
		goto out;

572
	iph = ip_hdr(skb);
L
Linus Torvalds 已提交
573

E
Eric Dumazet 已提交
574
	rcu_read_lock();
575 576 577
	tunnel = ipip6_tunnel_lookup(dev_net(skb->dev), skb->dev,
				     iph->saddr, iph->daddr);
	if (tunnel != NULL) {
E
Eric Dumazet 已提交
578 579
		struct pcpu_tstats *tstats;

L
Linus Torvalds 已提交
580
		secpath_reset(skb);
581
		skb->mac_header = skb->network_header;
582
		skb_reset_network_header(skb);
583
		IPCB(skb)->flags = 0;
L
Linus Torvalds 已提交
584 585
		skb->protocol = htons(ETH_P_IPV6);
		skb->pkt_type = PACKET_HOST;
F
Fred L. Templin 已提交
586 587

		if ((tunnel->dev->priv_flags & IFF_ISATAP) &&
588
		    !isatap_chksrc(skb, iph, tunnel)) {
589
			tunnel->dev->stats.rx_errors++;
E
Eric Dumazet 已提交
590
			rcu_read_unlock();
F
Fred L. Templin 已提交
591 592 593
			kfree_skb(skb);
			return 0;
		}
594

E
Eric Dumazet 已提交
595 596 597 598 599
		tstats = this_cpu_ptr(tunnel->dev->tstats);
		tstats->rx_packets++;
		tstats->rx_bytes += skb->len;

		__skb_tunnel_rx(skb, tunnel->dev);
600

L
Linus Torvalds 已提交
601
		ipip6_ecn_decapsulate(iph, skb);
E
Eric Dumazet 已提交
602

603
		netif_rx(skb);
E
Eric Dumazet 已提交
604

E
Eric Dumazet 已提交
605
		rcu_read_unlock();
L
Linus Torvalds 已提交
606 607 608
		return 0;
	}

609
	/* no tunnel matched,  let upstream know, ipsec may handle it */
E
Eric Dumazet 已提交
610
	rcu_read_unlock();
611
	return 1;
L
Linus Torvalds 已提交
612
out:
613
	kfree_skb(skb);
L
Linus Torvalds 已提交
614 615 616
	return 0;
}

617 618 619 620 621 622
/*
 * Returns the embedded IPv4 address if the IPv6 address
 * comes from 6rd / 6to4 (RFC 3056) addr space.
 */
static inline
__be32 try_6rd(struct in6_addr *v6dst, struct ip_tunnel *tunnel)
L
Linus Torvalds 已提交
623
{
A
Al Viro 已提交
624
	__be32 dst = 0;
L
Linus Torvalds 已提交
625

626 627 628
#ifdef CONFIG_IPV6_SIT_6RD
	if (ipv6_prefix_equal(v6dst, &tunnel->ip6rd.prefix,
			      tunnel->ip6rd.prefixlen)) {
E
Eric Dumazet 已提交
629
		unsigned int pbw0, pbi0;
630 631 632 633 634 635
		int pbi1;
		u32 d;

		pbw0 = tunnel->ip6rd.prefixlen >> 5;
		pbi0 = tunnel->ip6rd.prefixlen & 0x1f;

636
		d = (ntohl(v6dst->s6_addr32[pbw0]) << pbi0) >>
637 638 639 640
		    tunnel->ip6rd.relay_prefixlen;

		pbi1 = pbi0 - tunnel->ip6rd.relay_prefixlen;
		if (pbi1 > 0)
641
			d |= ntohl(v6dst->s6_addr32[pbw0 + 1]) >>
642 643 644 645 646
			     (32 - pbi1);

		dst = tunnel->ip6rd.relay_prefix | htonl(d);
	}
#else
L
Linus Torvalds 已提交
647
	if (v6dst->s6_addr16[0] == htons(0x2002)) {
648
		/* 6to4 v6 addr has 16 bits prefix, 32 v4addr, 16 SLA, ... */
L
Linus Torvalds 已提交
649 650
		memcpy(&dst, &v6dst->s6_addr16[1], 4);
	}
651
#endif
L
Linus Torvalds 已提交
652 653 654 655 656 657 658 659
	return dst;
}

/*
 *	This function assumes it is being called from dev_queue_xmit()
 *	and that skb is filled properly by that function.
 */

660 661
static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
				     struct net_device *dev)
L
Linus Torvalds 已提交
662
{
663
	struct ip_tunnel *tunnel = netdev_priv(dev);
E
Eric Dumazet 已提交
664
	struct pcpu_tstats *tstats;
L
Linus Torvalds 已提交
665
	struct iphdr  *tiph = &tunnel->parms.iph;
666
	struct ipv6hdr *iph6 = ipv6_hdr(skb);
L
Linus Torvalds 已提交
667
	u8     tos = tunnel->parms.iph.tos;
668
	__be16 df = tiph->frag_off;
L
Linus Torvalds 已提交
669
	struct rtable *rt;     			/* Route to the other host */
E
Eric Dumazet 已提交
670
	struct net_device *tdev;		/* Device to other host */
L
Linus Torvalds 已提交
671
	struct iphdr  *iph;			/* Our new IP header */
672
	unsigned int max_headroom;		/* The extra header space needed */
A
Al Viro 已提交
673
	__be32 dst = tiph->daddr;
L
Linus Torvalds 已提交
674
	int    mtu;
675
	struct in6_addr *addr6;
L
Linus Torvalds 已提交
676 677 678 679 680
	int addr_type;

	if (skb->protocol != htons(ETH_P_IPV6))
		goto tx_error;

F
Fred L. Templin 已提交
681 682 683 684
	/* ISATAP (RFC4214) - must come before 6to4 */
	if (dev->priv_flags & IFF_ISATAP) {
		struct neighbour *neigh = NULL;

E
Eric Dumazet 已提交
685 686
		if (skb_dst(skb))
			neigh = skb_dst(skb)->neighbour;
F
Fred L. Templin 已提交
687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703

		if (neigh == NULL) {
			if (net_ratelimit())
				printk(KERN_DEBUG "sit: nexthop == NULL\n");
			goto tx_error;
		}

		addr6 = (struct in6_addr*)&neigh->primary_key;
		addr_type = ipv6_addr_type(addr6);

		if ((addr_type & IPV6_ADDR_UNICAST) &&
		     ipv6_addr_is_isatap(addr6))
			dst = addr6->s6_addr32[3];
		else
			goto tx_error;
	}

L
Linus Torvalds 已提交
704
	if (!dst)
705
		dst = try_6rd(&iph6->daddr, tunnel);
L
Linus Torvalds 已提交
706 707 708 709

	if (!dst) {
		struct neighbour *neigh = NULL;

E
Eric Dumazet 已提交
710 711
		if (skb_dst(skb))
			neigh = skb_dst(skb)->neighbour;
L
Linus Torvalds 已提交
712 713 714 715 716 717 718 719 720 721 722

		if (neigh == NULL) {
			if (net_ratelimit())
				printk(KERN_DEBUG "sit: nexthop == NULL\n");
			goto tx_error;
		}

		addr6 = (struct in6_addr*)&neigh->primary_key;
		addr_type = ipv6_addr_type(addr6);

		if (addr_type == IPV6_ADDR_ANY) {
723
			addr6 = &ipv6_hdr(skb)->daddr;
L
Linus Torvalds 已提交
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
			addr_type = ipv6_addr_type(addr6);
		}

		if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
			goto tx_error_icmp;

		dst = addr6->s6_addr32[3];
	}

	{
		struct flowi fl = { .nl_u = { .ip4_u =
					      { .daddr = dst,
						.saddr = tiph->saddr,
						.tos = RT_TOS(tos) } },
				    .oif = tunnel->parms.link,
				    .proto = IPPROTO_IPV6 };
740
		if (ip_route_output_key(dev_net(dev), &rt, &fl)) {
E
Eric Dumazet 已提交
741
			dev->stats.tx_carrier_errors++;
L
Linus Torvalds 已提交
742 743 744 745 746
			goto tx_error_icmp;
		}
	}
	if (rt->rt_type != RTN_UNICAST) {
		ip_rt_put(rt);
E
Eric Dumazet 已提交
747
		dev->stats.tx_carrier_errors++;
L
Linus Torvalds 已提交
748 749
		goto tx_error_icmp;
	}
750
	tdev = rt->dst.dev;
L
Linus Torvalds 已提交
751 752 753

	if (tdev == dev) {
		ip_rt_put(rt);
E
Eric Dumazet 已提交
754
		dev->stats.collisions++;
L
Linus Torvalds 已提交
755 756 757
		goto tx_error;
	}

758
	if (df) {
759
		mtu = dst_mtu(&rt->dst) - sizeof(struct iphdr);
L
Linus Torvalds 已提交
760

761
		if (mtu < 68) {
E
Eric Dumazet 已提交
762
			dev->stats.collisions++;
763 764 765
			ip_rt_put(rt);
			goto tx_error;
		}
L
Linus Torvalds 已提交
766

767 768 769 770 771 772 773 774 775
		if (mtu < IPV6_MIN_MTU) {
			mtu = IPV6_MIN_MTU;
			df = 0;
		}

		if (tunnel->parms.iph.daddr && skb_dst(skb))
			skb_dst(skb)->ops->update_pmtu(skb_dst(skb), mtu);

		if (skb->len > mtu) {
776
			icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
777 778 779
			ip_rt_put(rt);
			goto tx_error;
		}
L
Linus Torvalds 已提交
780 781 782
	}

	if (tunnel->err_count > 0) {
783 784
		if (time_before(jiffies,
				tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
L
Linus Torvalds 已提交
785 786 787 788 789 790 791 792 793 794 795
			tunnel->err_count--;
			dst_link_failure(skb);
		} else
			tunnel->err_count = 0;
	}

	/*
	 * Okay, now see if we can stuff it in the buffer as-is.
	 */
	max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);

796 797
	if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
	    (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
L
Linus Torvalds 已提交
798 799 800
		struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
		if (!new_skb) {
			ip_rt_put(rt);
E
Eric Dumazet 已提交
801
			dev->stats.tx_dropped++;
L
Linus Torvalds 已提交
802
			dev_kfree_skb(skb);
803
			return NETDEV_TX_OK;
L
Linus Torvalds 已提交
804 805 806 807 808
		}
		if (skb->sk)
			skb_set_owner_w(new_skb, skb->sk);
		dev_kfree_skb(skb);
		skb = new_skb;
809
		iph6 = ipv6_hdr(skb);
L
Linus Torvalds 已提交
810 811
	}

812
	skb->transport_header = skb->network_header;
813 814
	skb_push(skb, sizeof(struct iphdr));
	skb_reset_network_header(skb);
L
Linus Torvalds 已提交
815
	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
816
	IPCB(skb)->flags = 0;
E
Eric Dumazet 已提交
817
	skb_dst_drop(skb);
818
	skb_dst_set(skb, &rt->dst);
L
Linus Torvalds 已提交
819 820 821 822 823

	/*
	 *	Push down and install the IPIP header.
	 */

824
	iph 			=	ip_hdr(skb);
L
Linus Torvalds 已提交
825 826
	iph->version		=	4;
	iph->ihl		=	sizeof(struct iphdr)>>2;
827
	iph->frag_off		=	df;
L
Linus Torvalds 已提交
828 829 830 831 832 833 834 835 836
	iph->protocol		=	IPPROTO_IPV6;
	iph->tos		=	INET_ECN_encapsulate(tos, ipv6_get_dsfield(iph6));
	iph->daddr		=	rt->rt_dst;
	iph->saddr		=	rt->rt_src;

	if ((iph->ttl = tiph->ttl) == 0)
		iph->ttl	=	iph6->hop_limit;

	nf_reset(skb);
E
Eric Dumazet 已提交
837 838
	tstats = this_cpu_ptr(dev->tstats);
	__IPTUNNEL_XMIT(tstats, &dev->stats);
839
	return NETDEV_TX_OK;
L
Linus Torvalds 已提交
840 841 842 843

tx_error_icmp:
	dst_link_failure(skb);
tx_error:
E
Eric Dumazet 已提交
844
	dev->stats.tx_errors++;
L
Linus Torvalds 已提交
845
	dev_kfree_skb(skb);
846
	return NETDEV_TX_OK;
L
Linus Torvalds 已提交
847 848
}

849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865
static void ipip6_tunnel_bind_dev(struct net_device *dev)
{
	struct net_device *tdev = NULL;
	struct ip_tunnel *tunnel;
	struct iphdr *iph;

	tunnel = netdev_priv(dev);
	iph = &tunnel->parms.iph;

	if (iph->daddr) {
		struct flowi fl = { .nl_u = { .ip4_u =
					      { .daddr = iph->daddr,
						.saddr = iph->saddr,
						.tos = RT_TOS(iph->tos) } },
				    .oif = tunnel->parms.link,
				    .proto = IPPROTO_IPV6 };
		struct rtable *rt;
866
		if (!ip_route_output_key(dev_net(dev), &rt, &fl)) {
867
			tdev = rt->dst.dev;
868 869 870 871 872 873
			ip_rt_put(rt);
		}
		dev->flags |= IFF_POINTOPOINT;
	}

	if (!tdev && tunnel->parms.link)
874
		tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
875 876 877 878 879 880 881 882 883 884

	if (tdev) {
		dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);
		dev->mtu = tdev->mtu - sizeof(struct iphdr);
		if (dev->mtu < IPV6_MIN_MTU)
			dev->mtu = IPV6_MIN_MTU;
	}
	dev->iflink = tunnel->parms.link;
}

L
Linus Torvalds 已提交
885 886 887 888 889
static int
ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
{
	int err = 0;
	struct ip_tunnel_parm p;
890
	struct ip_tunnel_prl prl;
L
Linus Torvalds 已提交
891
	struct ip_tunnel *t;
892 893
	struct net *net = dev_net(dev);
	struct sit_net *sitn = net_generic(net, sit_net_id);
894 895 896
#ifdef CONFIG_IPV6_SIT_6RD
	struct ip_tunnel_6rd ip6rd;
#endif
L
Linus Torvalds 已提交
897 898 899

	switch (cmd) {
	case SIOCGETTUNNEL:
900 901 902
#ifdef CONFIG_IPV6_SIT_6RD
	case SIOCGET6RD:
#endif
L
Linus Torvalds 已提交
903
		t = NULL;
904
		if (dev == sitn->fb_tunnel_dev) {
L
Linus Torvalds 已提交
905 906 907 908
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
				err = -EFAULT;
				break;
			}
909
			t = ipip6_tunnel_locate(net, &p, 0);
L
Linus Torvalds 已提交
910 911
		}
		if (t == NULL)
912
			t = netdev_priv(dev);
913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931

		err = -EFAULT;
		if (cmd == SIOCGETTUNNEL) {
			memcpy(&p, &t->parms, sizeof(p));
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &p,
					 sizeof(p)))
				goto done;
#ifdef CONFIG_IPV6_SIT_6RD
		} else {
			ipv6_addr_copy(&ip6rd.prefix, &t->ip6rd.prefix);
			ip6rd.relay_prefix = t->ip6rd.relay_prefix;
			ip6rd.prefixlen = t->ip6rd.prefixlen;
			ip6rd.relay_prefixlen = t->ip6rd.relay_prefixlen;
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &ip6rd,
					 sizeof(ip6rd)))
				goto done;
#endif
		}
		err = 0;
L
Linus Torvalds 已提交
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950
		break;

	case SIOCADDTUNNEL:
	case SIOCCHGTUNNEL:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			goto done;

		err = -EFAULT;
		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
			goto done;

		err = -EINVAL;
		if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPV6 ||
		    p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)))
			goto done;
		if (p.iph.ttl)
			p.iph.frag_off |= htons(IP_DF);

951
		t = ipip6_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
L
Linus Torvalds 已提交
952

953
		if (dev != sitn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
L
Linus Torvalds 已提交
954 955 956 957 958 959 960 961 962 963 964
			if (t != NULL) {
				if (t->dev != dev) {
					err = -EEXIST;
					break;
				}
			} else {
				if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
				    (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
					err = -EINVAL;
					break;
				}
965
				t = netdev_priv(dev);
966
				ipip6_tunnel_unlink(sitn, t);
967
				synchronize_net();
L
Linus Torvalds 已提交
968 969 970 971
				t->parms.iph.saddr = p.iph.saddr;
				t->parms.iph.daddr = p.iph.daddr;
				memcpy(dev->dev_addr, &p.iph.saddr, 4);
				memcpy(dev->broadcast, &p.iph.daddr, 4);
972
				ipip6_tunnel_link(sitn, t);
L
Linus Torvalds 已提交
973 974 975 976 977 978 979 980 981
				netdev_state_change(dev);
			}
		}

		if (t) {
			err = 0;
			if (cmd == SIOCCHGTUNNEL) {
				t->parms.iph.ttl = p.iph.ttl;
				t->parms.iph.tos = p.iph.tos;
982 983 984 985 986
				if (t->parms.link != p.link) {
					t->parms.link = p.link;
					ipip6_tunnel_bind_dev(dev);
					netdev_state_change(dev);
				}
L
Linus Torvalds 已提交
987 988 989 990 991 992 993 994 995 996 997 998
			}
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
				err = -EFAULT;
		} else
			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
		break;

	case SIOCDELTUNNEL:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			goto done;

999
		if (dev == sitn->fb_tunnel_dev) {
L
Linus Torvalds 已提交
1000 1001 1002 1003
			err = -EFAULT;
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
				goto done;
			err = -ENOENT;
1004
			if ((t = ipip6_tunnel_locate(net, &p, 0)) == NULL)
L
Linus Torvalds 已提交
1005 1006
				goto done;
			err = -EPERM;
1007
			if (t == netdev_priv(sitn->fb_tunnel_dev))
L
Linus Torvalds 已提交
1008 1009 1010
				goto done;
			dev = t->dev;
		}
1011 1012
		unregister_netdevice(dev);
		err = 0;
L
Linus Torvalds 已提交
1013 1014
		break;

1015
	case SIOCGETPRL:
1016 1017 1018 1019 1020 1021 1022 1023 1024
		err = -EINVAL;
		if (dev == sitn->fb_tunnel_dev)
			goto done;
		err = -ENOENT;
		if (!(t = netdev_priv(dev)))
			goto done;
		err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
		break;

1025 1026 1027 1028
	case SIOCADDPRL:
	case SIOCDELPRL:
	case SIOCCHGPRL:
		err = -EPERM;
1029
		if (!capable(CAP_NET_ADMIN))
1030 1031
			goto done;
		err = -EINVAL;
1032
		if (dev == sitn->fb_tunnel_dev)
1033 1034 1035 1036 1037 1038 1039 1040
			goto done;
		err = -EFAULT;
		if (copy_from_user(&prl, ifr->ifr_ifru.ifru_data, sizeof(prl)))
			goto done;
		err = -ENOENT;
		if (!(t = netdev_priv(dev)))
			goto done;

1041 1042
		switch (cmd) {
		case SIOCDELPRL:
1043
			err = ipip6_tunnel_del_prl(t, &prl);
1044 1045 1046
			break;
		case SIOCADDPRL:
		case SIOCCHGPRL:
1047
			err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
1048 1049
			break;
		}
1050
		netdev_state_change(dev);
1051 1052
		break;

1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
#ifdef CONFIG_IPV6_SIT_6RD
	case SIOCADD6RD:
	case SIOCCHG6RD:
	case SIOCDEL6RD:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			goto done;

		err = -EFAULT;
		if (copy_from_user(&ip6rd, ifr->ifr_ifru.ifru_data,
				   sizeof(ip6rd)))
			goto done;

		t = netdev_priv(dev);

		if (cmd != SIOCDEL6RD) {
			struct in6_addr prefix;
			__be32 relay_prefix;

			err = -EINVAL;
			if (ip6rd.relay_prefixlen > 32 ||
			    ip6rd.prefixlen + (32 - ip6rd.relay_prefixlen) > 64)
				goto done;

			ipv6_addr_prefix(&prefix, &ip6rd.prefix,
					 ip6rd.prefixlen);
			if (!ipv6_addr_equal(&prefix, &ip6rd.prefix))
				goto done;
1081 1082 1083 1084 1085 1086
			if (ip6rd.relay_prefixlen)
				relay_prefix = ip6rd.relay_prefix &
					       htonl(0xffffffffUL <<
						     (32 - ip6rd.relay_prefixlen));
			else
				relay_prefix = 0;
1087 1088 1089 1090 1091 1092 1093 1094
			if (relay_prefix != ip6rd.relay_prefix)
				goto done;

			ipv6_addr_copy(&t->ip6rd.prefix, &prefix);
			t->ip6rd.relay_prefix = relay_prefix;
			t->ip6rd.prefixlen = ip6rd.prefixlen;
			t->ip6rd.relay_prefixlen = ip6rd.relay_prefixlen;
		} else
1095
			ipip6_tunnel_clone_6rd(dev, sitn);
1096 1097 1098 1099 1100

		err = 0;
		break;
#endif

L
Linus Torvalds 已提交
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116
	default:
		err = -EINVAL;
	}

done:
	return err;
}

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))
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}

1117 1118 1119 1120 1121
static const struct net_device_ops ipip6_netdev_ops = {
	.ndo_uninit	= ipip6_tunnel_uninit,
	.ndo_start_xmit	= ipip6_tunnel_xmit,
	.ndo_do_ioctl	= ipip6_tunnel_ioctl,
	.ndo_change_mtu	= ipip6_tunnel_change_mtu,
E
Eric Dumazet 已提交
1122
	.ndo_get_stats	= ipip6_get_stats,
1123 1124
};

E
Eric Dumazet 已提交
1125 1126 1127 1128 1129 1130
static void ipip6_dev_free(struct net_device *dev)
{
	free_percpu(dev->tstats);
	free_netdev(dev);
}

L
Linus Torvalds 已提交
1131 1132
static void ipip6_tunnel_setup(struct net_device *dev)
{
1133
	dev->netdev_ops		= &ipip6_netdev_ops;
E
Eric Dumazet 已提交
1134
	dev->destructor 	= ipip6_dev_free;
L
Linus Torvalds 已提交
1135 1136 1137

	dev->type		= ARPHRD_SIT;
	dev->hard_header_len 	= LL_MAX_HEADER + sizeof(struct iphdr);
1138
	dev->mtu		= ETH_DATA_LEN - sizeof(struct iphdr);
L
Linus Torvalds 已提交
1139
	dev->flags		= IFF_NOARP;
1140
	dev->priv_flags	       &= ~IFF_XMIT_DST_RELEASE;
L
Linus Torvalds 已提交
1141 1142
	dev->iflink		= 0;
	dev->addr_len		= 4;
1143
	dev->features		|= NETIF_F_NETNS_LOCAL;
E
Eric Dumazet 已提交
1144
	dev->features		|= NETIF_F_LLTX;
L
Linus Torvalds 已提交
1145 1146
}

E
Eric Dumazet 已提交
1147
static int ipip6_tunnel_init(struct net_device *dev)
L
Linus Torvalds 已提交
1148
{
1149
	struct ip_tunnel *tunnel = netdev_priv(dev);
L
Linus Torvalds 已提交
1150 1151 1152 1153 1154 1155 1156

	tunnel->dev = dev;
	strcpy(tunnel->parms.name, dev->name);

	memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
	memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);

1157
	ipip6_tunnel_bind_dev(dev);
E
Eric Dumazet 已提交
1158 1159 1160 1161 1162
	dev->tstats = alloc_percpu(struct pcpu_tstats);
	if (!dev->tstats)
		return -ENOMEM;

	return 0;
L
Linus Torvalds 已提交
1163 1164
}

E
Eric Dumazet 已提交
1165
static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
L
Linus Torvalds 已提交
1166
{
1167
	struct ip_tunnel *tunnel = netdev_priv(dev);
L
Linus Torvalds 已提交
1168
	struct iphdr *iph = &tunnel->parms.iph;
1169 1170
	struct net *net = dev_net(dev);
	struct sit_net *sitn = net_generic(net, sit_net_id);
L
Linus Torvalds 已提交
1171 1172 1173 1174 1175 1176 1177 1178 1179

	tunnel->dev = dev;
	strcpy(tunnel->parms.name, dev->name);

	iph->version		= 4;
	iph->protocol		= IPPROTO_IPV6;
	iph->ihl		= 5;
	iph->ttl		= 64;

E
Eric Dumazet 已提交
1180 1181 1182
	dev->tstats = alloc_percpu(struct pcpu_tstats);
	if (!dev->tstats)
		return -ENOMEM;
L
Linus Torvalds 已提交
1183
	dev_hold(dev);
1184
	sitn->tunnels_wc[0]	= tunnel;
E
Eric Dumazet 已提交
1185
	return 0;
L
Linus Torvalds 已提交
1186 1187
}

1188
static struct xfrm_tunnel sit_handler __read_mostly = {
L
Linus Torvalds 已提交
1189 1190
	.handler	=	ipip6_rcv,
	.err_handler	=	ipip6_err,
1191
	.priority	=	1,
L
Linus Torvalds 已提交
1192 1193
};

1194
static void __net_exit sit_destroy_tunnels(struct sit_net *sitn, struct list_head *head)
1195 1196 1197 1198 1199 1200
{
	int prio;

	for (prio = 1; prio < 4; prio++) {
		int h;
		for (h = 0; h < HASH_SIZE; h++) {
1201 1202 1203 1204 1205 1206
			struct ip_tunnel *t = sitn->tunnels[prio][h];

			while (t != NULL) {
				unregister_netdevice_queue(t->dev, head);
				t = t->next;
			}
1207 1208 1209 1210
		}
	}
}

1211
static int __net_init sit_init_net(struct net *net)
1212
{
1213
	struct sit_net *sitn = net_generic(net, sit_net_id);
1214 1215
	int err;

1216 1217 1218 1219 1220
	sitn->tunnels[0] = sitn->tunnels_wc;
	sitn->tunnels[1] = sitn->tunnels_l;
	sitn->tunnels[2] = sitn->tunnels_r;
	sitn->tunnels[3] = sitn->tunnels_r_l;

1221 1222 1223 1224 1225 1226
	sitn->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "sit0",
					   ipip6_tunnel_setup);
	if (!sitn->fb_tunnel_dev) {
		err = -ENOMEM;
		goto err_alloc_dev;
	}
1227
	dev_net_set(sitn->fb_tunnel_dev, net);
1228

E
Eric Dumazet 已提交
1229 1230 1231 1232
	err = ipip6_fb_tunnel_init(sitn->fb_tunnel_dev);
	if (err)
		goto err_dev_free;

1233
	ipip6_tunnel_clone_6rd(sitn->fb_tunnel_dev, sitn);
1234 1235 1236 1237

	if ((err = register_netdev(sitn->fb_tunnel_dev)))
		goto err_reg_dev;

1238 1239
	return 0;

1240
err_reg_dev:
1241
	dev_put(sitn->fb_tunnel_dev);
E
Eric Dumazet 已提交
1242 1243
err_dev_free:
	ipip6_dev_free(sitn->fb_tunnel_dev);
1244
err_alloc_dev:
1245 1246 1247
	return err;
}

1248
static void __net_exit sit_exit_net(struct net *net)
1249
{
1250
	struct sit_net *sitn = net_generic(net, sit_net_id);
1251
	LIST_HEAD(list);
1252

1253
	rtnl_lock();
1254 1255 1256
	sit_destroy_tunnels(sitn, &list);
	unregister_netdevice_queue(sitn->fb_tunnel_dev, &list);
	unregister_netdevice_many(&list);
1257
	rtnl_unlock();
1258 1259 1260 1261 1262
}

static struct pernet_operations sit_net_ops = {
	.init = sit_init_net,
	.exit = sit_exit_net,
1263 1264
	.id   = &sit_net_id,
	.size = sizeof(struct sit_net),
1265 1266
};

1267
static void __exit sit_cleanup(void)
L
Linus Torvalds 已提交
1268
{
1269
	xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
1270

1271
	unregister_pernet_device(&sit_net_ops);
E
Eric Dumazet 已提交
1272
	rcu_barrier(); /* Wait for completion of call_rcu()'s */
L
Linus Torvalds 已提交
1273 1274
}

1275
static int __init sit_init(void)
L
Linus Torvalds 已提交
1276 1277 1278 1279 1280
{
	int err;

	printk(KERN_INFO "IPv6 over IPv4 tunneling driver\n");

1281
	err = register_pernet_device(&sit_net_ops);
1282
	if (err < 0)
1283 1284 1285 1286 1287 1288
		return err;
	err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
	if (err < 0) {
		unregister_pernet_device(&sit_net_ops);
		printk(KERN_INFO "sit init: Can't add protocol\n");
	}
L
Linus Torvalds 已提交
1289 1290
	return err;
}
1291 1292 1293

module_init(sit_init);
module_exit(sit_cleanup);
1294
MODULE_LICENSE("GPL");
1295
MODULE_ALIAS("sit0");