Subversion Repositories test_project

/*

 * Copyright (C)2003,2004 USAGI/WIDE Project

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 * Authors      Mitsuru KANDA  <mk@linux-ipv6.org>

 *              YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

 */

#include <linux/icmpv6.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/netdevice.h>

#include <linux/skbuff.h>

#include <net/ipv6.h>

#include <net/protocol.h>

#include <net/xfrm.h>

static struct xfrm6_tunnel *tunnel6_handlers;

static struct xfrm6_tunnel *tunnel46_handlers;

static DEFINE_MUTEX(tunnel6_mutex);

int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family)

{

        struct xfrm6_tunnel **pprev;

        int ret = -EEXIST;

        int priority = handler->priority;

        mutex_lock(&tunnel6_mutex);

        for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;

             *pprev; pprev = &(*pprev)->next) {

                if ((*pprev)->priority > priority)

                        break;

                if ((*pprev)->priority == priority)

                        goto err;

        }

        handler->next = *pprev;

        *pprev = handler;

        ret = 0;

err:

        mutex_unlock(&tunnel6_mutex);

        return ret;

}

EXPORT_SYMBOL(xfrm6_tunnel_register);

int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)

{

        struct xfrm6_tunnel **pprev;

        int ret = -ENOENT;

        mutex_lock(&tunnel6_mutex);

        for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;

             *pprev; pprev = &(*pprev)->next) {

                if (*pprev == handler) {

                        *pprev = handler->next;

                        ret = 0;

                        break;

                }

        }

        mutex_unlock(&tunnel6_mutex);

        synchronize_net();

        return ret;

}

EXPORT_SYMBOL(xfrm6_tunnel_deregister);

static int tunnel6_rcv(struct sk_buff *skb)

{

        struct xfrm6_tunnel *handler;

        if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))

                goto drop;

        for (handler = tunnel6_handlers; handler; handler = handler->next)

                if (!handler->handler(skb))

                        return 0;

        icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);

drop:

        kfree_skb(skb);

        return 0;

}

static int tunnel46_rcv(struct sk_buff *skb)

{

        struct xfrm6_tunnel *handler;

        if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))

                goto drop;

        for (handler = tunnel46_handlers; handler; handler = handler->next)

                if (!handler->handler(skb))

                        return 0;

        icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);

drop:

        kfree_skb(skb);

        return 0;

}

static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,

                        int type, int code, int offset, __be32 info)

{

        struct xfrm6_tunnel *handler;

        for (handler = tunnel6_handlers; handler; handler = handler->next)

                if (!handler->err_handler(skb, opt, type, code, offset, info))

                        break;

}

static struct inet6_protocol tunnel6_protocol = {

        .handler        = tunnel6_rcv,

        .err_handler    = tunnel6_err,

        .flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,

};

static struct inet6_protocol tunnel46_protocol = {

        .handler        = tunnel46_rcv,

        .err_handler    = tunnel6_err,

        .flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,

};

static int __init tunnel6_init(void)

{

        if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {

                printk(KERN_ERR "tunnel6 init(): can't add protocol\n");

                return -EAGAIN;

        }

        if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {

                printk(KERN_ERR "tunnel6 init(): can't add protocol\n");

                inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);

                return -EAGAIN;

        }

        return 0;

}

static void __exit tunnel6_fini(void)

{

        if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))

                printk(KERN_ERR "tunnel6 close: can't remove protocol\n");

        if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))

                printk(KERN_ERR "tunnel6 close: can't remove protocol\n");

}

module_init(tunnel6_init);

module_exit(tunnel6_fini);

MODULE_LICENSE("GPL");