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1da177e4 LT |
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 |