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1#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{
40 memset(scm, 0, sizeof(*scm));
41 scm->creds.uid = current->uid;
42 scm->creds.gid = current->gid;
43 scm->creds.pid = current->tgid;
44 if (msg->msg_controllen <= 0)
45 return 0;
46 return __scm_send(sock, msg, scm);
47}
48
49static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
50 struct scm_cookie *scm, int flags)
51{
52 if (!msg->msg_control)
53 {
54 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
55 msg->msg_flags |= MSG_CTRUNC;
56 scm_destroy(scm);
57 return;
58 }
59
60 if (test_bit(SOCK_PASSCRED, &sock->flags))
61 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
62
63 if (!scm->fp)
64 return;
65
66 scm_detach_fds(msg, scm);
67}
68
69
70#endif /* __LINUX_NET_SCM_H */
71