git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 |