1 #ifndef __LINUX_NET_SCM_H
2 #define __LINUX_NET_SCM_H
3
4 /* Well, we should have at least one descriptor open
5 * to accept passed FDs 8)
6 */
7 #define SCM_MAX_FD (OPEN_MAX-1)
8
9 struct scm_fp_list
10 {
11 struct list_head list;
12 int count;
13 struct file *fp[SCM_MAX_FD];
14 };
15
16 struct scm_cookie
17 {
18 struct ucred creds; /* Skb credentials */
19 struct scm_fp_list *fp; /* Passed files */
20 unsigned long seq; /* Connection seqno */
21 };
22
23 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
24 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
25 extern void __scm_destroy(struct scm_cookie *scm);
26 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
27
scm_destroy(struct scm_cookie * scm)28 static __inline__ void scm_destroy(struct scm_cookie *scm)
29 {
30 if (scm && scm->fp)
31 __scm_destroy(scm);
32 }
33
scm_send(struct socket * sock,struct msghdr * msg,struct scm_cookie * scm)34 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
35 struct scm_cookie *scm)
36 {
37 memset(scm, 0, sizeof(*scm));
38 scm->creds.uid = current->uid;
39 scm->creds.gid = current->gid;
40 scm->creds.pid = current->pid;
41 if (msg->msg_controllen <= 0)
42 return 0;
43 return __scm_send(sock, msg, scm);
44 }
45
scm_recv(struct socket * sock,struct msghdr * msg,struct scm_cookie * scm,int flags)46 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
47 struct scm_cookie *scm, int flags)
48 {
49 if (!msg->msg_control)
50 {
51 if (sock->passcred || scm->fp)
52 msg->msg_flags |= MSG_CTRUNC;
53 scm_destroy(scm);
54 return;
55 }
56
57 if (sock->passcred)
58 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
59
60 if (!scm->fp)
61 return;
62
63 scm_detach_fds(msg, scm);
64 }
65
66
67 #endif /* __LINUX_NET_SCM_H */
68
69