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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 | #define pr_fmt(fmt) "IPv6: " fmt |
23 | |
24 | #include <linux/icmpv6.h> |
25 | #include <linux/init.h> |
26 | #include <linux/module.h> |
27 | #include <linux/mutex.h> |
28 | #include <linux/netdevice.h> |
29 | #include <linux/skbuff.h> |
30 | #include <linux/slab.h> |
31 | #include <net/ipv6.h> |
32 | #include <net/protocol.h> |
33 | #include <net/xfrm.h> |
34 | |
35 | static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly; |
36 | static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly; |
37 | static DEFINE_MUTEX(tunnel6_mutex); |
38 | |
39 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family) |
40 | { |
41 | struct xfrm6_tunnel __rcu **pprev; |
42 | struct xfrm6_tunnel *t; |
43 | int ret = -EEXIST; |
44 | int priority = handler->priority; |
45 | |
46 | mutex_lock(&tunnel6_mutex); |
47 | |
48 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
49 | (t = rcu_dereference_protected(*pprev, |
50 | lockdep_is_held(&tunnel6_mutex))) != NULL; |
51 | pprev = &t->next) { |
52 | if (t->priority > priority) |
53 | break; |
54 | if (t->priority == priority) |
55 | goto err; |
56 | } |
57 | |
58 | handler->next = *pprev; |
59 | rcu_assign_pointer(*pprev, handler); |
60 | |
61 | ret = 0; |
62 | |
63 | err: |
64 | mutex_unlock(&tunnel6_mutex); |
65 | |
66 | return ret; |
67 | } |
68 | |
69 | EXPORT_SYMBOL(xfrm6_tunnel_register); |
70 | |
71 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family) |
72 | { |
73 | struct xfrm6_tunnel __rcu **pprev; |
74 | struct xfrm6_tunnel *t; |
75 | int ret = -ENOENT; |
76 | |
77 | mutex_lock(&tunnel6_mutex); |
78 | |
79 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
80 | (t = rcu_dereference_protected(*pprev, |
81 | lockdep_is_held(&tunnel6_mutex))) != NULL; |
82 | pprev = &t->next) { |
83 | if (t == handler) { |
84 | *pprev = handler->next; |
85 | ret = 0; |
86 | break; |
87 | } |
88 | } |
89 | |
90 | mutex_unlock(&tunnel6_mutex); |
91 | |
92 | synchronize_net(); |
93 | |
94 | return ret; |
95 | } |
96 | |
97 | EXPORT_SYMBOL(xfrm6_tunnel_deregister); |
98 | |
99 | #define for_each_tunnel_rcu(head, handler) \ |
100 | for (handler = rcu_dereference(head); \ |
101 | handler != NULL; \ |
102 | handler = rcu_dereference(handler->next)) \ |
103 | |
104 | static int tunnel6_rcv(struct sk_buff *skb) |
105 | { |
106 | struct xfrm6_tunnel *handler; |
107 | |
108 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
109 | goto drop; |
110 | |
111 | for_each_tunnel_rcu(tunnel6_handlers, handler) |
112 | if (!handler->handler(skb)) |
113 | return 0; |
114 | |
115 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
116 | |
117 | drop: |
118 | kfree_skb(skb); |
119 | return 0; |
120 | } |
121 | |
122 | static int tunnel46_rcv(struct sk_buff *skb) |
123 | { |
124 | struct xfrm6_tunnel *handler; |
125 | |
126 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
127 | goto drop; |
128 | |
129 | for_each_tunnel_rcu(tunnel46_handlers, handler) |
130 | if (!handler->handler(skb)) |
131 | return 0; |
132 | |
133 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
134 | |
135 | drop: |
136 | kfree_skb(skb); |
137 | return 0; |
138 | } |
139 | |
140 | static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
141 | u8 type, u8 code, int offset, __be32 info) |
142 | { |
143 | struct xfrm6_tunnel *handler; |
144 | |
145 | for_each_tunnel_rcu(tunnel6_handlers, handler) |
146 | if (!handler->err_handler(skb, opt, type, code, offset, info)) |
147 | break; |
148 | } |
149 | |
150 | static const struct inet6_protocol tunnel6_protocol = { |
151 | .handler = tunnel6_rcv, |
152 | .err_handler = tunnel6_err, |
153 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
154 | }; |
155 | |
156 | static const struct inet6_protocol tunnel46_protocol = { |
157 | .handler = tunnel46_rcv, |
158 | .err_handler = tunnel6_err, |
159 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
160 | }; |
161 | |
162 | static int __init tunnel6_init(void) |
163 | { |
164 | if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { |
165 | pr_err("%s: can't add protocol\n", __func__); |
166 | return -EAGAIN; |
167 | } |
168 | if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) { |
169 | pr_err("%s: can't add protocol\n", __func__); |
170 | inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6); |
171 | return -EAGAIN; |
172 | } |
173 | return 0; |
174 | } |
175 | |
176 | static void __exit tunnel6_fini(void) |
177 | { |
178 | if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP)) |
179 | pr_err("%s: can't remove protocol\n", __func__); |
180 | if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) |
181 | pr_err("%s: can't remove protocol\n", __func__); |
182 | } |
183 | |
184 | module_init(tunnel6_init); |
185 | module_exit(tunnel6_fini); |
186 | MODULE_LICENSE("GPL"); |
187 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9