Herbert Xu | d2acc34 | 2006-03-28 01:12:13 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C)2003,2004 USAGI/WIDE Project |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | * |
| 18 | * Authors Mitsuru KANDA <mk@linux-ipv6.org> |
| 19 | * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> |
| 20 | */ |
| 21 | |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/mutex.h> |
| 25 | #include <linux/netdevice.h> |
| 26 | #include <linux/skbuff.h> |
| 27 | #include <net/protocol.h> |
| 28 | #include <net/xfrm.h> |
| 29 | |
| 30 | static struct xfrm6_tunnel *tunnel6_handlers; |
| 31 | static DEFINE_MUTEX(tunnel6_mutex); |
| 32 | |
| 33 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler) |
| 34 | { |
| 35 | struct xfrm6_tunnel **pprev; |
| 36 | int ret = -EEXIST; |
| 37 | int priority = handler->priority; |
| 38 | |
| 39 | mutex_lock(&tunnel6_mutex); |
| 40 | |
| 41 | for (pprev = &tunnel6_handlers; *pprev; pprev = &(*pprev)->next) { |
| 42 | if ((*pprev)->priority > priority) |
| 43 | break; |
| 44 | if ((*pprev)->priority == priority) |
| 45 | goto err; |
| 46 | } |
| 47 | |
| 48 | handler->next = *pprev; |
| 49 | *pprev = handler; |
| 50 | |
| 51 | ret = 0; |
| 52 | |
| 53 | err: |
| 54 | mutex_unlock(&tunnel6_mutex); |
| 55 | |
| 56 | return ret; |
| 57 | } |
| 58 | |
| 59 | EXPORT_SYMBOL(xfrm6_tunnel_register); |
| 60 | |
| 61 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler) |
| 62 | { |
| 63 | struct xfrm6_tunnel **pprev; |
| 64 | int ret = -ENOENT; |
| 65 | |
| 66 | mutex_lock(&tunnel6_mutex); |
| 67 | |
| 68 | for (pprev = &tunnel6_handlers; *pprev; pprev = &(*pprev)->next) { |
| 69 | if (*pprev == handler) { |
| 70 | *pprev = handler->next; |
| 71 | ret = 0; |
| 72 | break; |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | mutex_unlock(&tunnel6_mutex); |
| 77 | |
| 78 | synchronize_net(); |
| 79 | |
| 80 | return ret; |
| 81 | } |
| 82 | |
| 83 | EXPORT_SYMBOL(xfrm6_tunnel_deregister); |
| 84 | |
| 85 | static int tunnel6_rcv(struct sk_buff **pskb) |
| 86 | { |
| 87 | struct sk_buff *skb = *pskb; |
| 88 | struct xfrm6_tunnel *handler; |
| 89 | |
| 90 | for (handler = tunnel6_handlers; handler; handler = handler->next) |
| 91 | if (!handler->handler(skb)) |
| 92 | return 0; |
| 93 | |
| 94 | kfree_skb(skb); |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| 99 | int type, int code, int offset, __u32 info) |
| 100 | { |
| 101 | struct xfrm6_tunnel *handler; |
| 102 | |
| 103 | for (handler = tunnel6_handlers; handler; handler = handler->next) |
| 104 | if (!handler->err_handler(skb, opt, type, code, offset, info)) |
| 105 | break; |
| 106 | } |
| 107 | |
| 108 | static struct inet6_protocol tunnel6_protocol = { |
| 109 | .handler = tunnel6_rcv, |
| 110 | .err_handler = tunnel6_err, |
| 111 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| 112 | }; |
| 113 | |
| 114 | static int __init tunnel6_init(void) |
| 115 | { |
| 116 | if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { |
| 117 | printk(KERN_ERR "tunnel6 init(): can't add protocol\n"); |
| 118 | return -EAGAIN; |
| 119 | } |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static void __exit tunnel6_fini(void) |
| 124 | { |
| 125 | if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) |
| 126 | printk(KERN_ERR "tunnel6 close: can't remove protocol\n"); |
| 127 | } |
| 128 | |
| 129 | module_init(tunnel6_init); |
| 130 | module_exit(tunnel6_fini); |
| 131 | MODULE_LICENSE("GPL"); |