[PATCH] libata: flush COMRESET set and clear
[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         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
49 static __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