140 lines
3.3 KiB
C
140 lines
3.3 KiB
C
/*
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* Copyright (C)2003,2004 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Authors Mitsuru KANDA <mk@linux-ipv6.org>
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* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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*/
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#include <linux/icmpv6.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <net/ipv6.h>
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#include <net/protocol.h>
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#include <net/xfrm.h>
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static struct xfrm6_tunnel *tunnel6_handlers;
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static DEFINE_MUTEX(tunnel6_mutex);
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int xfrm6_tunnel_register(struct xfrm6_tunnel *handler)
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{
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struct xfrm6_tunnel **pprev;
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int ret = -EEXIST;
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int priority = handler->priority;
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mutex_lock(&tunnel6_mutex);
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for (pprev = &tunnel6_handlers; *pprev; pprev = &(*pprev)->next) {
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if ((*pprev)->priority > priority)
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break;
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if ((*pprev)->priority == priority)
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goto err;
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}
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handler->next = *pprev;
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*pprev = handler;
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ret = 0;
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err:
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mutex_unlock(&tunnel6_mutex);
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return ret;
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}
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EXPORT_SYMBOL(xfrm6_tunnel_register);
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int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler)
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{
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struct xfrm6_tunnel **pprev;
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int ret = -ENOENT;
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mutex_lock(&tunnel6_mutex);
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for (pprev = &tunnel6_handlers; *pprev; pprev = &(*pprev)->next) {
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if (*pprev == handler) {
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*pprev = handler->next;
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ret = 0;
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break;
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}
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}
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mutex_unlock(&tunnel6_mutex);
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synchronize_net();
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return ret;
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}
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EXPORT_SYMBOL(xfrm6_tunnel_deregister);
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static int tunnel6_rcv(struct sk_buff **pskb)
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{
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struct sk_buff *skb = *pskb;
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struct xfrm6_tunnel *handler;
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if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
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goto drop;
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for (handler = tunnel6_handlers; handler; handler = handler->next)
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if (!handler->handler(skb))
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return 0;
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icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, skb->dev);
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drop:
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kfree_skb(skb);
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return 0;
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}
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static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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int type, int code, int offset, __u32 info)
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{
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struct xfrm6_tunnel *handler;
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for (handler = tunnel6_handlers; handler; handler = handler->next)
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if (!handler->err_handler(skb, opt, type, code, offset, info))
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break;
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}
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static struct inet6_protocol tunnel6_protocol = {
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.handler = tunnel6_rcv,
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.err_handler = tunnel6_err,
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.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
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};
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static int __init tunnel6_init(void)
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{
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if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
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printk(KERN_ERR "tunnel6 init(): can't add protocol\n");
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return -EAGAIN;
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}
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return 0;
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}
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static void __exit tunnel6_fini(void)
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{
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if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
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printk(KERN_ERR "tunnel6 close: can't remove protocol\n");
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}
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module_init(tunnel6_init);
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module_exit(tunnel6_fini);
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MODULE_LICENSE("GPL");
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