[NET]: Fill in a 32-bit hole in struct sock on 64-bit platforms.
[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
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
12 struct scm_fp_list
13 {
14         int             count;
15         struct file     *fp[SCM_MAX_FD];
16 };
17
18 struct 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
25 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
26 extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
27 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
28 extern void __scm_destroy(struct scm_cookie *scm);
29 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
30
31 static __inline__ void scm_destroy(struct scm_cookie *scm)
32 {
33         if (scm && scm->fp)
34                 __scm_destroy(scm);
35 }
36
37 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
38                                struct scm_cookie *scm)
39 {
40         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;
46         if (msg->msg_controllen <= 0)
47                 return 0;
48         return __scm_send(sock, msg, scm);
49 }
50
51 static __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