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Linux/net/ipv6/tunnel6.c

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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 EXPORT_SYMBOL(xfrm6_tunnel_register);
 68 
 69 int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family)
 70 {
 71         struct xfrm6_tunnel __rcu **pprev;
 72         struct xfrm6_tunnel *t;
 73         int ret = -ENOENT;
 74 
 75         mutex_lock(&tunnel6_mutex);
 76 
 77         for (pprev = (family == AF_INET6) ? &tunnel6_handlers : &tunnel46_handlers;
 78              (t = rcu_dereference_protected(*pprev,
 79                         lockdep_is_held(&tunnel6_mutex))) != NULL;
 80              pprev = &t->next) {
 81                 if (t == handler) {
 82                         *pprev = handler->next;
 83                         ret = 0;
 84                         break;
 85                 }
 86         }
 87 
 88         mutex_unlock(&tunnel6_mutex);
 89 
 90         synchronize_net();
 91 
 92         return ret;
 93 }
 94 EXPORT_SYMBOL(xfrm6_tunnel_deregister);
 95 
 96 #define for_each_tunnel_rcu(head, handler)              \
 97         for (handler = rcu_dereference(head);           \
 98              handler != NULL;                           \
 99              handler = rcu_dereference(handler->next))  \
100 
101 static int tunnel6_rcv(struct sk_buff *skb)
102 {
103         struct xfrm6_tunnel *handler;
104 
105         if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
106                 goto drop;
107 
108         for_each_tunnel_rcu(tunnel6_handlers, handler)
109                 if (!handler->handler(skb))
110                         return 0;
111 
112         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
113 
114 drop:
115         kfree_skb(skb);
116         return 0;
117 }
118 
119 static int tunnel46_rcv(struct sk_buff *skb)
120 {
121         struct xfrm6_tunnel *handler;
122 
123         if (!pskb_may_pull(skb, sizeof(struct iphdr)))
124                 goto drop;
125 
126         for_each_tunnel_rcu(tunnel46_handlers, handler)
127                 if (!handler->handler(skb))
128                         return 0;
129 
130         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
131 
132 drop:
133         kfree_skb(skb);
134         return 0;
135 }
136 
137 static void tunnel6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
138                         u8 type, u8 code, int offset, __be32 info)
139 {
140         struct xfrm6_tunnel *handler;
141 
142         for_each_tunnel_rcu(tunnel6_handlers, handler)
143                 if (!handler->err_handler(skb, opt, type, code, offset, info))
144                         break;
145 }
146 
147 static const struct inet6_protocol tunnel6_protocol = {
148         .handler        = tunnel6_rcv,
149         .err_handler    = tunnel6_err,
150         .flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
151 };
152 
153 static const struct inet6_protocol tunnel46_protocol = {
154         .handler        = tunnel46_rcv,
155         .err_handler    = tunnel6_err,
156         .flags          = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
157 };
158 
159 static int __init tunnel6_init(void)
160 {
161         if (inet6_add_protocol(&tunnel6_protocol, IPPROTO_IPV6)) {
162                 pr_err("%s: can't add protocol\n", __func__);
163                 return -EAGAIN;
164         }
165         if (inet6_add_protocol(&tunnel46_protocol, IPPROTO_IPIP)) {
166                 pr_err("%s: can't add protocol\n", __func__);
167                 inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6);
168                 return -EAGAIN;
169         }
170         return 0;
171 }
172 
173 static void __exit tunnel6_fini(void)
174 {
175         if (inet6_del_protocol(&tunnel46_protocol, IPPROTO_IPIP))
176                 pr_err("%s: can't remove protocol\n", __func__);
177         if (inet6_del_protocol(&tunnel6_protocol, IPPROTO_IPV6))
178                 pr_err("%s: can't remove protocol\n", __func__);
179 }
180 
181 module_init(tunnel6_init);
182 module_exit(tunnel6_fini);
183 MODULE_LICENSE("GPL");
184 

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