#ifndef __LINUX_NET_SCM_H #define __LINUX_NET_SCM_H #include <linux/limits.h> #include <linux/net.h> #include <linux/security.h> #include <linux/pid.h> #include <linux/nsproxy.h> /* Well, we should have at least one descriptor open * to accept passed FDs 8) */ #define SCM_MAX_FD 255 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 */ #ifdef CONFIG_SECURITY_NETWORK u32 secid; /* Passed security ID */ #endif 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); #ifdef CONFIG_SECURITY_NETWORK static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) { security_socket_getpeersec_dgram(sock, NULL, &scm->secid); } #else static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) { } #endif /* CONFIG_SECURITY_NETWORK */ 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) { struct task_struct *p = current; scm->creds.uid = p->uid; scm->creds.gid = p->gid; scm->creds.pid = task_tgid_vnr(p); scm->fp = NULL; scm->seq = 0; unix_get_peersec_dgram(sock, scm); if (msg->msg_controllen <= 0) return 0; return __scm_send(sock, msg, scm); } #ifdef CONFIG_SECURITY_NETWORK static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) { char *secdata; u32 seclen; int err; if (test_bit(SOCK_PASSSEC, &sock->flags)) { err = security_secid_to_secctx(scm->secid, &secdata, &seclen); if (!err) { put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); security_release_secctx(secdata, seclen); } } } #else static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) { } #endif /* CONFIG_SECURITY_NETWORK */ 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); scm_passec(sock, msg, scm); if (!scm->fp) return; scm_detach_fds(msg, scm); } #endif /* __LINUX_NET_SCM_H */