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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __LINUX_NET_SCM_H
2#define __LINUX_NET_SCM_H
3
4#include <linux/limits.h>
5#include <linux/net.h>
6
7/* Well, we should have at least one descriptor open
8 * to accept passed FDs 8)
9 */
10#define SCM_MAX_FD (OPEN_MAX-1)
11
12struct scm_fp_list
13{
14 int count;
15 struct file *fp[SCM_MAX_FD];
16};
17
18struct scm_cookie
19{
20 struct ucred creds; /* Skb credentials */
21 struct scm_fp_list *fp; /* Passed files */
22 unsigned long seq; /* Connection seqno */
23};
24
25extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
26extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
27extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
28extern void __scm_destroy(struct scm_cookie *scm);
29extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
30
31static __inline__ void scm_destroy(struct scm_cookie *scm)
32{
33 if (scm && scm->fp)
34 __scm_destroy(scm);
35}
36
37static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
38 struct scm_cookie *scm)
39{
Benjamin LaHaise1d541dd2006-03-20 21:31:51 -080040 struct task_struct *p = current;
41 scm->creds.uid = p->uid;
42 scm->creds.gid = p->gid;
43 scm->creds.pid = p->tgid;
44 scm->fp = NULL;
45 scm->seq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 if (msg->msg_controllen <= 0)
47 return 0;
48 return __scm_send(sock, msg, scm);
49}
50
51static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
52 struct scm_cookie *scm, int flags)
53{
54 if (!msg->msg_control)
55 {
56 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
57 msg->msg_flags |= MSG_CTRUNC;
58 scm_destroy(scm);
59 return;
60 }
61
62 if (test_bit(SOCK_PASSCRED, &sock->flags))
63 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
64
65 if (!scm->fp)
66 return;
67
68 scm_detach_fds(msg, scm);
69}
70
71
72#endif /* __LINUX_NET_SCM_H */
73