audit: validate comparison operations, store them in sane form
[linux-2.6] / include / net / scm.h
1 #ifndef __LINUX_NET_SCM_H
2 #define __LINUX_NET_SCM_H
3
4 #include <linux/limits.h>
5 #include <linux/net.h>
6 #include <linux/security.h>
7 #include <linux/pid.h>
8 #include <linux/nsproxy.h>
9
10 /* Well, we should have at least one descriptor open
11  * to accept passed FDs 8)
12  */
13 #define SCM_MAX_FD      255
14
15 struct scm_fp_list
16 {
17         struct list_head        list;
18         int                     count;
19         struct file             *fp[SCM_MAX_FD];
20 };
21
22 struct scm_cookie
23 {
24         struct ucred            creds;          /* Skb credentials      */
25         struct scm_fp_list      *fp;            /* Passed files         */
26 #ifdef CONFIG_SECURITY_NETWORK
27         u32                     secid;          /* Passed security ID   */
28 #endif
29         unsigned long           seq;            /* Connection seqno     */
30 };
31
32 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
33 extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
34 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
35 extern void __scm_destroy(struct scm_cookie *scm);
36 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
37
38 #ifdef CONFIG_SECURITY_NETWORK
39 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
40 {
41         security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
42 }
43 #else
44 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
45 { }
46 #endif /* CONFIG_SECURITY_NETWORK */
47
48 static __inline__ void scm_destroy(struct scm_cookie *scm)
49 {
50         if (scm && scm->fp)
51                 __scm_destroy(scm);
52 }
53
54 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
55                                struct scm_cookie *scm)
56 {
57         struct task_struct *p = current;
58         scm->creds.uid = current_uid();
59         scm->creds.gid = current_gid();
60         scm->creds.pid = task_tgid_vnr(p);
61         scm->fp = NULL;
62         scm->seq = 0;
63         unix_get_peersec_dgram(sock, scm);
64         if (msg->msg_controllen <= 0)
65                 return 0;
66         return __scm_send(sock, msg, scm);
67 }
68
69 #ifdef CONFIG_SECURITY_NETWORK
70 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
71 {
72         char *secdata;
73         u32 seclen;
74         int err;
75
76         if (test_bit(SOCK_PASSSEC, &sock->flags)) {
77                 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
78
79                 if (!err) {
80                         put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
81                         security_release_secctx(secdata, seclen);
82                 }
83         }
84 }
85 #else
86 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
87 { }
88 #endif /* CONFIG_SECURITY_NETWORK */
89
90 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
91                                 struct scm_cookie *scm, int flags)
92 {
93         if (!msg->msg_control)
94         {
95                 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
96                         msg->msg_flags |= MSG_CTRUNC;
97                 scm_destroy(scm);
98                 return;
99         }
100
101         if (test_bit(SOCK_PASSCRED, &sock->flags))
102                 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
103
104         scm_passec(sock, msg, scm);
105
106         if (!scm->fp)
107                 return;
108         
109         scm_detach_fds(msg, scm);
110 }
111
112
113 #endif /* __LINUX_NET_SCM_H */
114