#ifndef __LINUX_NET_SCM_H #define __LINUX_NET_SCM_H #include <linux/limits.h> #include <linux/net.h> /* Well, we should have at least one descriptor open * to accept passed FDs 8) */ #define SCM_MAX_FD (OPEN_MAX-1) struct scm_fp_list { int count; struct file *fp[SCM_MAX_FD]; }; struct scm_cookie { struct ucred creds; /* Skb credentials */ struct scm_fp_list *fp; /* Passed files */ unsigned long seq; /* Connection seqno */ }; extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm); extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm); extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm); extern void __scm_destroy(struct scm_cookie *scm); extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl); static __inline__ void scm_destroy(struct scm_cookie *scm) { if (scm && scm->fp) __scm_destroy(scm); } static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) { memset(scm, 0, sizeof(*scm)); scm->creds.uid = current->uid; scm->creds.gid = current->gid; scm->creds.pid = current->tgid; if (msg->msg_controllen <= 0) return 0; return __scm_send(sock, msg, scm); } static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm, int flags) { if (!msg->msg_control) { if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp) msg->msg_flags |= MSG_CTRUNC; scm_destroy(scm); return; } if (test_bit(SOCK_PASSCRED, &sock->flags)) put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds); if (!scm->fp) return; scm_detach_fds(msg, scm); } #endif /* __LINUX_NET_SCM_H */