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Linux/net/ipv6/xfrm6_protocol.c

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  1 /* xfrm6_protocol.c - Generic xfrm protocol multiplexer for ipv6.
  2  *
  3  * Copyright (C) 2013 secunet Security Networks AG
  4  *
  5  * Author:
  6  * Steffen Klassert <steffen.klassert@secunet.com>
  7  *
  8  * Based on:
  9  * net/ipv4/xfrm4_protocol.c
 10  *
 11  *      This program is free software; you can redistribute it and/or
 12  *      modify it under the terms of the GNU General Public License
 13  *      as published by the Free Software Foundation; either version
 14  *      2 of the License, or (at your option) any later version.
 15  */
 16 
 17 #include <linux/init.h>
 18 #include <linux/mutex.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/icmpv6.h>
 21 #include <net/ipv6.h>
 22 #include <net/protocol.h>
 23 #include <net/xfrm.h>
 24 
 25 static struct xfrm6_protocol __rcu *esp6_handlers __read_mostly;
 26 static struct xfrm6_protocol __rcu *ah6_handlers __read_mostly;
 27 static struct xfrm6_protocol __rcu *ipcomp6_handlers __read_mostly;
 28 static DEFINE_MUTEX(xfrm6_protocol_mutex);
 29 
 30 static inline struct xfrm6_protocol __rcu **proto_handlers(u8 protocol)
 31 {
 32         switch (protocol) {
 33         case IPPROTO_ESP:
 34                 return &esp6_handlers;
 35         case IPPROTO_AH:
 36                 return &ah6_handlers;
 37         case IPPROTO_COMP:
 38                 return &ipcomp6_handlers;
 39         }
 40 
 41         return NULL;
 42 }
 43 
 44 #define for_each_protocol_rcu(head, handler)            \
 45         for (handler = rcu_dereference(head);           \
 46              handler != NULL;                           \
 47              handler = rcu_dereference(handler->next))  \
 48 
 49 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err)
 50 {
 51         int ret;
 52         struct xfrm6_protocol *handler;
 53         struct xfrm6_protocol __rcu **head = proto_handlers(protocol);
 54 
 55         if (!head)
 56                 return 0;
 57 
 58         for_each_protocol_rcu(*proto_handlers(protocol), handler)
 59                 if ((ret = handler->cb_handler(skb, err)) <= 0)
 60                         return ret;
 61 
 62         return 0;
 63 }
 64 EXPORT_SYMBOL(xfrm6_rcv_cb);
 65 
 66 static int xfrm6_esp_rcv(struct sk_buff *skb)
 67 {
 68         int ret;
 69         struct xfrm6_protocol *handler;
 70 
 71         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
 72 
 73         for_each_protocol_rcu(esp6_handlers, handler)
 74                 if ((ret = handler->handler(skb)) != -EINVAL)
 75                         return ret;
 76 
 77         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 78 
 79         kfree_skb(skb);
 80         return 0;
 81 }
 82 
 83 static void xfrm6_esp_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 84                           u8 type, u8 code, int offset, __be32 info)
 85 {
 86         struct xfrm6_protocol *handler;
 87 
 88         for_each_protocol_rcu(esp6_handlers, handler)
 89                 if (!handler->err_handler(skb, opt, type, code, offset, info))
 90                         break;
 91 }
 92 
 93 static int xfrm6_ah_rcv(struct sk_buff *skb)
 94 {
 95         int ret;
 96         struct xfrm6_protocol *handler;
 97 
 98         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
 99 
100         for_each_protocol_rcu(ah6_handlers, handler)
101                 if ((ret = handler->handler(skb)) != -EINVAL)
102                         return ret;
103 
104         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
105 
106         kfree_skb(skb);
107         return 0;
108 }
109 
110 static void xfrm6_ah_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
111                          u8 type, u8 code, int offset, __be32 info)
112 {
113         struct xfrm6_protocol *handler;
114 
115         for_each_protocol_rcu(ah6_handlers, handler)
116                 if (!handler->err_handler(skb, opt, type, code, offset, info))
117                         break;
118 }
119 
120 static int xfrm6_ipcomp_rcv(struct sk_buff *skb)
121 {
122         int ret;
123         struct xfrm6_protocol *handler;
124 
125         XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
126 
127         for_each_protocol_rcu(ipcomp6_handlers, handler)
128                 if ((ret = handler->handler(skb)) != -EINVAL)
129                         return ret;
130 
131         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
132 
133         kfree_skb(skb);
134         return 0;
135 }
136 
137 static void xfrm6_ipcomp_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
138                              u8 type, u8 code, int offset, __be32 info)
139 {
140         struct xfrm6_protocol *handler;
141 
142         for_each_protocol_rcu(ipcomp6_handlers, handler)
143                 if (!handler->err_handler(skb, opt, type, code, offset, info))
144                         break;
145 }
146 
147 static const struct inet6_protocol esp6_protocol = {
148         .handler        =       xfrm6_esp_rcv,
149         .err_handler    =       xfrm6_esp_err,
150         .flags          =       INET6_PROTO_NOPOLICY,
151 };
152 
153 static const struct inet6_protocol ah6_protocol = {
154         .handler        =       xfrm6_ah_rcv,
155         .err_handler    =       xfrm6_ah_err,
156         .flags          =       INET6_PROTO_NOPOLICY,
157 };
158 
159 static const struct inet6_protocol ipcomp6_protocol = {
160         .handler        =       xfrm6_ipcomp_rcv,
161         .err_handler    =       xfrm6_ipcomp_err,
162         .flags          =       INET6_PROTO_NOPOLICY,
163 };
164 
165 static const struct xfrm_input_afinfo xfrm6_input_afinfo = {
166         .family         =       AF_INET6,
167         .callback       =       xfrm6_rcv_cb,
168 };
169 
170 static inline const struct inet6_protocol *netproto(unsigned char protocol)
171 {
172         switch (protocol) {
173         case IPPROTO_ESP:
174                 return &esp6_protocol;
175         case IPPROTO_AH:
176                 return &ah6_protocol;
177         case IPPROTO_COMP:
178                 return &ipcomp6_protocol;
179         }
180 
181         return NULL;
182 }
183 
184 int xfrm6_protocol_register(struct xfrm6_protocol *handler,
185                             unsigned char protocol)
186 {
187         struct xfrm6_protocol __rcu **pprev;
188         struct xfrm6_protocol *t;
189         bool add_netproto = false;
190         int ret = -EEXIST;
191         int priority = handler->priority;
192 
193         if (!proto_handlers(protocol) || !netproto(protocol))
194                 return -EINVAL;
195 
196         mutex_lock(&xfrm6_protocol_mutex);
197 
198         if (!rcu_dereference_protected(*proto_handlers(protocol),
199                                        lockdep_is_held(&xfrm6_protocol_mutex)))
200                 add_netproto = true;
201 
202         for (pprev = proto_handlers(protocol);
203              (t = rcu_dereference_protected(*pprev,
204                         lockdep_is_held(&xfrm6_protocol_mutex))) != NULL;
205              pprev = &t->next) {
206                 if (t->priority < priority)
207                         break;
208                 if (t->priority == priority)
209                         goto err;
210         }
211 
212         handler->next = *pprev;
213         rcu_assign_pointer(*pprev, handler);
214 
215         ret = 0;
216 
217 err:
218         mutex_unlock(&xfrm6_protocol_mutex);
219 
220         if (add_netproto) {
221                 if (inet6_add_protocol(netproto(protocol), protocol)) {
222                         pr_err("%s: can't add protocol\n", __func__);
223                         ret = -EAGAIN;
224                 }
225         }
226 
227         return ret;
228 }
229 EXPORT_SYMBOL(xfrm6_protocol_register);
230 
231 int xfrm6_protocol_deregister(struct xfrm6_protocol *handler,
232                               unsigned char protocol)
233 {
234         struct xfrm6_protocol __rcu **pprev;
235         struct xfrm6_protocol *t;
236         int ret = -ENOENT;
237 
238         if (!proto_handlers(protocol) || !netproto(protocol))
239                 return -EINVAL;
240 
241         mutex_lock(&xfrm6_protocol_mutex);
242 
243         for (pprev = proto_handlers(protocol);
244              (t = rcu_dereference_protected(*pprev,
245                         lockdep_is_held(&xfrm6_protocol_mutex))) != NULL;
246              pprev = &t->next) {
247                 if (t == handler) {
248                         *pprev = handler->next;
249                         ret = 0;
250                         break;
251                 }
252         }
253 
254         if (!rcu_dereference_protected(*proto_handlers(protocol),
255                                        lockdep_is_held(&xfrm6_protocol_mutex))) {
256                 if (inet6_del_protocol(netproto(protocol), protocol) < 0) {
257                         pr_err("%s: can't remove protocol\n", __func__);
258                         ret = -EAGAIN;
259                 }
260         }
261 
262         mutex_unlock(&xfrm6_protocol_mutex);
263 
264         synchronize_net();
265 
266         return ret;
267 }
268 EXPORT_SYMBOL(xfrm6_protocol_deregister);
269 
270 int __init xfrm6_protocol_init(void)
271 {
272         return xfrm_input_register_afinfo(&xfrm6_input_afinfo);
273 }
274 
275 void xfrm6_protocol_fini(void)
276 {
277         xfrm_input_unregister_afinfo(&xfrm6_input_afinfo);
278 }
279 

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