/* * 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 DEFINE_MUTEX(tunnel6_mutex); int xfrm6_tunnel_register(struct xfrm6_tunnel *handler) { struct xfrm6_tunnel **pprev; int ret = -EEXIST; int priority = handler->priority; mutex_lock(&tunnel6_mutex); for (pprev = &tunnel6_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) { struct xfrm6_tunnel **pprev; int ret = -ENOENT; mutex_lock(&tunnel6_mutex); for (pprev = &tunnel6_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 **pskb) { struct sk_buff *skb = *pskb; 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 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 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; } return 0; } static void __exit tunnel6_fini(void) { 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");