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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, see <http://www.gnu.org/licenses/>. |
16 | * |
17 | * Authors Mitsuru KANDA <mk@linux-ipv6.org> |
18 | * YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> |
19 | */ |
20 | |
21 | #define pr_fmt(fmt) "IPv6: " fmt |
22 | |
23 | #include <linux/icmpv6.h> |
24 | #include <linux/init.h> |
25 | #include <linux/module.h> |
26 | #include <linux/mutex.h> |
27 | #include <linux/netdevice.h> |
28 | #include <linux/skbuff.h> |
29 | #include <linux/slab.h> |
30 | #include <net/ipv6.h> |
31 | #include <net/protocol.h> |
32 | #include <net/xfrm.h> |
33 | |
34 | static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly; |
35 | static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly; |
36 | static DEFINE_MUTEX(tunnel6_mutex); |
37 | |
38 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family) |
39 | { |
40 | struct xfrm6_tunnel __rcu **pprev; |
41 | struct xfrm6_tunnel *t; |
42 | int ret = -EEXIST; |
43 | int priority = handler->priority; |
44 | |
45 | mutex_lock(&tunnel6_mutex); |
46 | |
47 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
48 | (t = rcu_dereference_protected(*pprev, |
49 | lockdep_is_held(&tunnel6_mutex))) != NULL; |
50 | pprev = &t->next) { |
51 | if (t->priority > priority) |
52 | break; |
53 | if (t->priority == priority) |
54 | goto err; |
55 | } |
56 | |
57 | handler->next = *pprev; |
58 | rcu_assign_pointer(*pprev, handler); |
59 | |
60 | ret = 0; |
61 | |
62 | err: |
63 | mutex_unlock(&tunnel6_mutex); |
64 | |
65 | return ret; |
66 | } |
67 | |
68 | EXPORT_SYMBOL(xfrm6_tunnel_register); |
69 | |
70 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family) |
71 | { |
72 | struct xfrm6_tunnel __rcu **pprev; |
73 | struct xfrm6_tunnel *t; |
74 | int ret = -ENOENT; |
75 | |
76 | mutex_lock(&tunnel6_mutex); |
77 | |
78 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
79 | (t = rcu_dereference_protected(*pprev, |
80 | lockdep_is_held(&tunnel6_mutex))) != NULL; |
81 | pprev = &t->next) { |
82 | if (t == handler) { |
83 | *pprev = handler->next; |
84 | ret = 0; |
85 | break; |
86 | } |
87 | } |
88 | |
89 | mutex_unlock(&tunnel6_mutex); |
90 | |
91 | synchronize_net(); |
92 | |
93 | return ret; |
94 | } |
95 | |
96 | EXPORT_SYMBOL(xfrm6_tunnel_deregister); |
97 | |
98 | #define for_each_tunnel_rcu(head, handler) \ |
99 | for (handler = rcu_dereference(head); \ |
100 | handler != NULL; \ |
101 | handler = rcu_dereference(handler->next)) \ |
102 | |
103 | static int tunnel6_rcv(struct sk_buff *skb) |
104 | { |
105 | struct xfrm6_tunnel *handler; |
106 | |
107 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
108 | goto drop; |
109 | |
110 | for_each_tunnel_rcu(tunnel6_handlers, handler) |
111 | if (!handler->handler(skb)) |
112 | return 0; |
113 | |
114 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
115 | |
116 | drop: |
117 | kfree_skb(skb); |
118 | return 0; |
119 | } |
120 | |
121 | static int tunnel46_rcv(struct sk_buff *skb) |
122 | { |
123 | struct xfrm6_tunnel *handler; |
124 | |
125 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
126 | goto drop; |
127 | |
128 | for_each_tunnel_rcu(tunnel46_handlers, handler) |
129 | if (!handler->handler(skb)) |
130 | return 0; |
131 | |
132 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
133 | |
134 | drop: |
135 | kfree_skb(skb); |
136 | return 0; |
137 | } |
138 | |
139 | static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
140 | u8 type, u8 code, int offset, __be32 info) |
141 | { |
142 | struct xfrm6_tunnel *handler; |
143 | |
144 | for_each_tunnel_rcu(tunnel6_handlers, handler) |
145 | if (!handler->err_handler(skb, opt, type, code, offset, info)) |
146 | break; |
147 | } |
148 | |
149 | static const struct inet6_protocol tunnel6_protocol = { |
150 | .handler = tunnel6_rcv, |
151 | .err_handler = tunnel6_err, |
152 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
153 | }; |
154 | |
155 | static const struct inet6_protocol tunnel46_protocol = { |
156 | .handler = tunnel46_rcv, |
157 | .err_handler = tunnel6_err, |
158 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
159 | }; |
160 | |
161 | static int __init tunnel6_init(void) |
162 | { |
163 | if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { |
164 | pr_err("%s: can't add protocol\n", __func__); |
165 | return -EAGAIN; |
166 | } |
167 | if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) { |
168 | pr_err("%s: can't add protocol\n", __func__); |
169 | inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6); |
170 | return -EAGAIN; |
171 | } |
172 | return 0; |
173 | } |
174 | |
175 | static void __exit tunnel6_fini(void) |
176 | { |
177 | if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP)) |
178 | pr_err("%s: can't remove protocol\n", __func__); |
179 | if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) |
180 | pr_err("%s: can't remove protocol\n", __func__); |
181 | } |
182 | |
183 | module_init(tunnel6_init); |
184 | module_exit(tunnel6_fini); |
185 | MODULE_LICENSE("GPL"); |
186 |
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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