1 /* xfrm6_protocol.c - Generic xfrm protocol multiplexer for ipv6.
3 * Copyright (C) 2013 secunet Security Networks AG
6 * Steffen Klassert <steffen.klassert@secunet.com>
9 * net/ipv4/xfrm4_protocol.c
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.
17 #include <linux/init.h>
18 #include <linux/mutex.h>
19 #include <linux/skbuff.h>
20 #include <linux/icmpv6.h>
22 #include <net/protocol.h>
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
);
30 static inline struct xfrm6_protocol __rcu
**proto_handlers(u8 protocol
)
34 return &esp6_handlers
;
38 return &ipcomp6_handlers
;
44 #define for_each_protocol_rcu(head, handler) \
45 for (handler = rcu_dereference(head); \
47 handler = rcu_dereference(handler->next)) \
49 int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err)
52 struct xfrm6_protocol
*handler
;
54 for_each_protocol_rcu(*proto_handlers(protocol
), handler
)
55 if ((ret
= handler
->cb_handler(skb
, err
)) <= 0)
60 EXPORT_SYMBOL(xfrm6_rcv_cb
);
62 static int xfrm6_esp_rcv(struct sk_buff
*skb
)
65 struct xfrm6_protocol
*handler
;
67 XFRM_TUNNEL_SKB_CB(skb
)->tunnel
.ip6
= NULL
;
69 for_each_protocol_rcu(esp6_handlers
, handler
)
70 if ((ret
= handler
->handler(skb
)) != -EINVAL
)
73 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
79 static void xfrm6_esp_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
80 u8 type
, u8 code
, int offset
, __be32 info
)
82 struct xfrm6_protocol
*handler
;
84 for_each_protocol_rcu(esp6_handlers
, handler
)
85 if (!handler
->err_handler(skb
, opt
, type
, code
, offset
, info
))
89 static int xfrm6_ah_rcv(struct sk_buff
*skb
)
92 struct xfrm6_protocol
*handler
;
94 XFRM_TUNNEL_SKB_CB(skb
)->tunnel
.ip6
= NULL
;
96 for_each_protocol_rcu(ah6_handlers
, handler
)
97 if ((ret
= handler
->handler(skb
)) != -EINVAL
)
100 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
106 static void xfrm6_ah_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
107 u8 type
, u8 code
, int offset
, __be32 info
)
109 struct xfrm6_protocol
*handler
;
111 for_each_protocol_rcu(ah6_handlers
, handler
)
112 if (!handler
->err_handler(skb
, opt
, type
, code
, offset
, info
))
116 static int xfrm6_ipcomp_rcv(struct sk_buff
*skb
)
119 struct xfrm6_protocol
*handler
;
121 XFRM_TUNNEL_SKB_CB(skb
)->tunnel
.ip6
= NULL
;
123 for_each_protocol_rcu(ipcomp6_handlers
, handler
)
124 if ((ret
= handler
->handler(skb
)) != -EINVAL
)
127 icmpv6_send(skb
, ICMPV6_DEST_UNREACH
, ICMPV6_PORT_UNREACH
, 0);
133 static void xfrm6_ipcomp_err(struct sk_buff
*skb
, struct inet6_skb_parm
*opt
,
134 u8 type
, u8 code
, int offset
, __be32 info
)
136 struct xfrm6_protocol
*handler
;
138 for_each_protocol_rcu(ipcomp6_handlers
, handler
)
139 if (!handler
->err_handler(skb
, opt
, type
, code
, offset
, info
))
143 static const struct inet6_protocol esp6_protocol
= {
144 .handler
= xfrm6_esp_rcv
,
145 .err_handler
= xfrm6_esp_err
,
146 .flags
= INET6_PROTO_NOPOLICY
,
149 static const struct inet6_protocol ah6_protocol
= {
150 .handler
= xfrm6_ah_rcv
,
151 .err_handler
= xfrm6_ah_err
,
152 .flags
= INET6_PROTO_NOPOLICY
,
155 static const struct inet6_protocol ipcomp6_protocol
= {
156 .handler
= xfrm6_ipcomp_rcv
,
157 .err_handler
= xfrm6_ipcomp_err
,
158 .flags
= INET6_PROTO_NOPOLICY
,
161 static struct xfrm_input_afinfo xfrm6_input_afinfo
= {
163 .owner
= THIS_MODULE
,
164 .callback
= xfrm6_rcv_cb
,
167 static inline const struct inet6_protocol
*netproto(unsigned char protocol
)
171 return &esp6_protocol
;
173 return &ah6_protocol
;
175 return &ipcomp6_protocol
;
181 int xfrm6_protocol_register(struct xfrm6_protocol
*handler
,
182 unsigned char protocol
)
184 struct xfrm6_protocol __rcu
**pprev
;
185 struct xfrm6_protocol
*t
;
186 bool add_netproto
= false;
189 int priority
= handler
->priority
;
191 mutex_lock(&xfrm6_protocol_mutex
);
193 if (!rcu_dereference_protected(*proto_handlers(protocol
),
194 lockdep_is_held(&xfrm6_protocol_mutex
)))
197 for (pprev
= proto_handlers(protocol
);
198 (t
= rcu_dereference_protected(*pprev
,
199 lockdep_is_held(&xfrm6_protocol_mutex
))) != NULL
;
201 if (t
->priority
< priority
)
203 if (t
->priority
== priority
)
207 handler
->next
= *pprev
;
208 rcu_assign_pointer(*pprev
, handler
);
213 mutex_unlock(&xfrm6_protocol_mutex
);
216 if (inet6_add_protocol(netproto(protocol
), protocol
)) {
217 pr_err("%s: can't add protocol\n", __func__
);
224 EXPORT_SYMBOL(xfrm6_protocol_register
);
226 int xfrm6_protocol_deregister(struct xfrm6_protocol
*handler
,
227 unsigned char protocol
)
229 struct xfrm6_protocol __rcu
**pprev
;
230 struct xfrm6_protocol
*t
;
233 mutex_lock(&xfrm6_protocol_mutex
);
235 for (pprev
= proto_handlers(protocol
);
236 (t
= rcu_dereference_protected(*pprev
,
237 lockdep_is_held(&xfrm6_protocol_mutex
))) != NULL
;
240 *pprev
= handler
->next
;
246 if (!rcu_dereference_protected(*proto_handlers(protocol
),
247 lockdep_is_held(&xfrm6_protocol_mutex
))) {
248 if (inet6_del_protocol(netproto(protocol
), protocol
) < 0) {
249 pr_err("%s: can't remove protocol\n", __func__
);
254 mutex_unlock(&xfrm6_protocol_mutex
);
260 EXPORT_SYMBOL(xfrm6_protocol_deregister
);
262 int __init
xfrm6_protocol_init(void)
264 return xfrm_input_register_afinfo(&xfrm6_input_afinfo
);
267 void xfrm6_protocol_fini(void)
269 xfrm_input_unregister_afinfo(&xfrm6_input_afinfo
);