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 int count;
18 struct file *fp[SCM_MAX_FD];
19 };
20
21 struct scm_cookie
22 {
23 struct ucred creds; /* Skb credentials */
24 struct scm_fp_list *fp; /* Passed files */
25 #ifdef CONFIG_SECURITY_NETWORK
26 u32 secid; /* Passed security ID */
27 #endif
28 unsigned long seq; /* Connection seqno */
29 };
30
31 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
32 extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
33 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
34 extern void __scm_destroy(struct scm_cookie *scm);
35 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
36
37 #ifdef CONFIG_SECURITY_NETWORK
38 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
39 {
40 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
41 }
42 #else
43 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
44 { }
45 #endif /* CONFIG_SECURITY_NETWORK */
46
47 static __inline__ void scm_destroy(struct scm_cookie *scm)
48 {
49 if (scm && scm->fp)
50 __scm_destroy(scm);
51 }
52
53 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
54 struct scm_cookie *scm)
55 {
56 struct task_struct *p = current;
57 scm->creds.uid = p->uid;
58 scm->creds.gid = p->gid;
59 scm->creds.pid = task_tgid_vnr(p);
60 scm->fp = NULL;
61 scm->seq = 0;
62 unix_get_peersec_dgram(sock, scm);
63 if (msg->msg_controllen <= 0)
64 return 0;
65 return __scm_send(sock, msg, scm);
66 }
67
68 #ifdef CONFIG_SECURITY_NETWORK
69 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
70 {
71 char *secdata;
72 u32 seclen;
73 int err;
74
75 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
76 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
77
78 if (!err) {
79 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
80 security_release_secctx(secdata, seclen);
81 }
82 }
83 }
84 #else
85 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
86 { }
87 #endif /* CONFIG_SECURITY_NETWORK */
88
89 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
90 struct scm_cookie *scm, int flags)
91 {
92 if (!msg->msg_control)
93 {
94 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
95 msg->msg_flags |= MSG_CTRUNC;
96 scm_destroy(scm);
97 return;
98 }
99
100 if (test_bit(SOCK_PASSCRED, &sock->flags))
101 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
102
103 scm_passec(sock, msg, scm);
104
105 if (!scm->fp)
106 return;
107
108 scm_detach_fds(msg, scm);
109 }
110
111
112 #endif /* __LINUX_NET_SCM_H */
113
114
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