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d2acc347 HX |
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 | ||
f3213831 JP |
22 | #define pr_fmt(fmt) "IPv6: " fmt |
23 | ||
50fba2aa | 24 | #include <linux/icmpv6.h> |
d2acc347 HX |
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> | |
5a0e3ad6 | 30 | #include <linux/slab.h> |
50fba2aa | 31 | #include <net/ipv6.h> |
d2acc347 HX |
32 | #include <net/protocol.h> |
33 | #include <net/xfrm.h> | |
34 | ||
6f0bcf15 ED |
35 | static struct xfrm6_tunnel __rcu *tunnel6_handlers __read_mostly; |
36 | static struct xfrm6_tunnel __rcu *tunnel46_handlers __read_mostly; | |
d2acc347 HX |
37 | static DEFINE_MUTEX(tunnel6_mutex); |
38 | ||
73d605d1 | 39 | int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family) |
d2acc347 | 40 | { |
6f0bcf15 ED |
41 | struct xfrm6_tunnel __rcu **pprev; |
42 | struct xfrm6_tunnel *t; | |
d2acc347 HX |
43 | int ret = -EEXIST; |
44 | int priority = handler->priority; | |
45 | ||
46 | mutex_lock(&tunnel6_mutex); | |
47 | ||
73d605d1 | 48 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
6f0bcf15 ED |
49 | (t = rcu_dereference_protected(*pprev, |
50 | lockdep_is_held(&tunnel6_mutex))) != NULL; | |
51 | pprev = &t->next) { | |
52 | if (t->priority > priority) | |
d2acc347 | 53 | break; |
6f0bcf15 | 54 | if (t->priority == priority) |
d2acc347 HX |
55 | goto err; |
56 | } | |
57 | ||
58 | handler->next = *pprev; | |
49d61e23 | 59 | rcu_assign_pointer(*pprev, handler); |
d2acc347 HX |
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 | ||
73d605d1 | 71 | int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family) |
d2acc347 | 72 | { |
6f0bcf15 ED |
73 | struct xfrm6_tunnel __rcu **pprev; |
74 | struct xfrm6_tunnel *t; | |
d2acc347 HX |
75 | int ret = -ENOENT; |
76 | ||
77 | mutex_lock(&tunnel6_mutex); | |
78 | ||
73d605d1 | 79 | for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers; |
6f0bcf15 ED |
80 | (t = rcu_dereference_protected(*pprev, |
81 | lockdep_is_held(&tunnel6_mutex))) != NULL; | |
82 | pprev = &t->next) { | |
83 | if (t == handler) { | |
d2acc347 HX |
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 | ||
875168a9 ED |
99 | #define for_each_tunnel_rcu(head, handler) \ |
100 | for (handler = rcu_dereference(head); \ | |
101 | handler != NULL; \ | |
102 | handler = rcu_dereference(handler->next)) \ | |
103 | ||
e5bbef20 | 104 | static int tunnel6_rcv(struct sk_buff *skb) |
d2acc347 | 105 | { |
d2acc347 HX |
106 | struct xfrm6_tunnel *handler; |
107 | ||
50fba2aa HX |
108 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
109 | goto drop; | |
110 | ||
875168a9 | 111 | for_each_tunnel_rcu(tunnel6_handlers, handler) |
d2acc347 HX |
112 | if (!handler->handler(skb)) |
113 | return 0; | |
114 | ||
3ffe533c | 115 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
50fba2aa HX |
116 | |
117 | drop: | |
d2acc347 HX |
118 | kfree_skb(skb); |
119 | return 0; | |
120 | } | |
121 | ||
e5bbef20 | 122 | static int tunnel46_rcv(struct sk_buff *skb) |
73d605d1 | 123 | { |
73d605d1 KM |
124 | struct xfrm6_tunnel *handler; |
125 | ||
82836372 | 126 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
73d605d1 KM |
127 | goto drop; |
128 | ||
875168a9 | 129 | for_each_tunnel_rcu(tunnel46_handlers, handler) |
73d605d1 KM |
130 | if (!handler->handler(skb)) |
131 | return 0; | |
132 | ||
3ffe533c | 133 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
73d605d1 KM |
134 | |
135 | drop: | |
136 | kfree_skb(skb); | |
137 | return 0; | |
138 | } | |
139 | ||
d2acc347 | 140 | static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 141 | u8 type, u8 code, int offset, __be32 info) |
d2acc347 HX |
142 | { |
143 | struct xfrm6_tunnel *handler; | |
144 | ||
875168a9 | 145 | for_each_tunnel_rcu(tunnel6_handlers, handler) |
d2acc347 HX |
146 | if (!handler->err_handler(skb, opt, type, code, offset, info)) |
147 | break; | |
148 | } | |
149 | ||
41135cc8 | 150 | static const struct inet6_protocol tunnel6_protocol = { |
d2acc347 HX |
151 | .handler = tunnel6_rcv, |
152 | .err_handler = tunnel6_err, | |
153 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
154 | }; | |
155 | ||
41135cc8 | 156 | static const struct inet6_protocol tunnel46_protocol = { |
73d605d1 KM |
157 | .handler = tunnel46_rcv, |
158 | .err_handler = tunnel6_err, | |
159 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
160 | }; | |
161 | ||
d2acc347 HX |
162 | static int __init tunnel6_init(void) |
163 | { | |
164 | if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) { | |
f3213831 | 165 | pr_err("%s: can't add protocol\n", __func__); |
d2acc347 HX |
166 | return -EAGAIN; |
167 | } | |
73d605d1 | 168 | if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) { |
f3213831 | 169 | pr_err("%s: can't add protocol\n", __func__); |
73d605d1 KM |
170 | inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6); |
171 | return -EAGAIN; | |
172 | } | |
d2acc347 HX |
173 | return 0; |
174 | } | |
175 | ||
176 | static void __exit tunnel6_fini(void) | |
177 | { | |
73d605d1 | 178 | if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP)) |
f3213831 | 179 | pr_err("%s: can't remove protocol\n", __func__); |
d2acc347 | 180 | if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6)) |
f3213831 | 181 | pr_err("%s: can't remove protocol\n", __func__); |
d2acc347 HX |
182 | } |
183 | ||
184 | module_init(tunnel6_init); | |
185 | module_exit(tunnel6_fini); | |
186 | MODULE_LICENSE("GPL"); |