Linux Kernel  3.7.1
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xfrm.h
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1 /*
2  * SELinux support for the XFRM LSM hooks
3  *
4  * Author : Trent Jaeger, <[email protected]>
5  * Updated : Venkat Yekkirala, <[email protected]>
6  */
7 #ifndef _SELINUX_XFRM_H_
8 #define _SELINUX_XFRM_H_
9 
10 #include <net/flow.h>
11 
12 int selinux_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
13  struct xfrm_user_sec_ctx *sec_ctx);
14 int selinux_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
15  struct xfrm_sec_ctx **new_ctxp);
16 void selinux_xfrm_policy_free(struct xfrm_sec_ctx *ctx);
17 int selinux_xfrm_policy_delete(struct xfrm_sec_ctx *ctx);
18 int selinux_xfrm_state_alloc(struct xfrm_state *x,
19  struct xfrm_user_sec_ctx *sec_ctx, u32 secid);
20 void selinux_xfrm_state_free(struct xfrm_state *x);
21 int selinux_xfrm_state_delete(struct xfrm_state *x);
22 int selinux_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid, u8 dir);
23 int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x,
24  struct xfrm_policy *xp, const struct flowi *fl);
25 
26 /*
27  * Extract the security blob from the sock (it's actually on the socket)
28  */
29 static inline struct inode_security_struct *get_sock_isec(struct sock *sk)
30 {
31  if (!sk->sk_socket)
32  return NULL;
33 
34  return SOCK_INODE(sk->sk_socket)->i_security;
35 }
36 
37 #ifdef CONFIG_SECURITY_NETWORK_XFRM
38 extern atomic_t selinux_xfrm_refcount;
39 
40 static inline int selinux_xfrm_enabled(void)
41 {
42  return (atomic_read(&selinux_xfrm_refcount) > 0);
43 }
44 
45 int selinux_xfrm_sock_rcv_skb(u32 sid, struct sk_buff *skb,
46  struct common_audit_data *ad);
47 int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
48  struct common_audit_data *ad, u8 proto);
49 int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall);
50 
51 static inline void selinux_xfrm_notify_policyload(void)
52 {
53  atomic_inc(&flow_cache_genid);
54  rt_genid_bump(&init_net);
55 }
56 #else
57 static inline int selinux_xfrm_enabled(void)
58 {
59  return 0;
60 }
61 
62 static inline int selinux_xfrm_sock_rcv_skb(u32 isec_sid, struct sk_buff *skb,
63  struct common_audit_data *ad)
64 {
65  return 0;
66 }
67 
68 static inline int selinux_xfrm_postroute_last(u32 isec_sid, struct sk_buff *skb,
69  struct common_audit_data *ad, u8 proto)
70 {
71  return 0;
72 }
73 
74 static inline int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall)
75 {
76  *sid = SECSID_NULL;
77  return 0;
78 }
79 
80 static inline void selinux_xfrm_notify_policyload(void)
81 {
82 }
83 #endif
84 
85 static inline void selinux_skb_xfrm_sid(struct sk_buff *skb, u32 *sid)
86 {
87  int err = selinux_xfrm_decode_session(skb, sid, 0);
88  BUG_ON(err);
89 }
90 
91 #endif /* _SELINUX_XFRM_H_ */
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