1 #ifndef __LINUX_NET_SCM_H
2 #define __LINUX_NET_SCM_H
4 #include <linux/limits.h>
6 #include <linux/security.h>
8 #include <linux/nsproxy.h>
10 /* Well, we should have at least one descriptor open
11 * to accept passed FDs 8)
13 #define SCM_MAX_FD 255
17 struct list_head list;
19 struct file *fp[SCM_MAX_FD];
24 struct ucred creds; /* Skb credentials */
25 struct scm_fp_list *fp; /* Passed files */
26 #ifdef CONFIG_SECURITY_NETWORK
27 u32 secid; /* Passed security ID */
29 unsigned long seq; /* Connection seqno */
32 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
33 extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
34 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
35 extern void __scm_destroy(struct scm_cookie *scm);
36 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
38 #ifdef CONFIG_SECURITY_NETWORK
39 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
41 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
44 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
46 #endif /* CONFIG_SECURITY_NETWORK */
48 static __inline__ void scm_destroy(struct scm_cookie *scm)
54 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
55 struct scm_cookie *scm)
57 struct task_struct *p = current;
58 scm->creds.uid = current_uid();
59 scm->creds.gid = current_gid();
60 scm->creds.pid = task_tgid_vnr(p);
63 unix_get_peersec_dgram(sock, scm);
64 if (msg->msg_controllen <= 0)
66 return __scm_send(sock, msg, scm);
69 #ifdef CONFIG_SECURITY_NETWORK
70 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
76 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
77 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
80 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
81 security_release_secctx(secdata, seclen);
86 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
88 #endif /* CONFIG_SECURITY_NETWORK */
90 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
91 struct scm_cookie *scm, int flags)
93 if (!msg->msg_control)
95 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
96 msg->msg_flags |= MSG_CTRUNC;
101 if (test_bit(SOCK_PASSCRED, &sock->flags))
102 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
104 scm_passec(sock, msg, scm);
109 scm_detach_fds(msg, scm);
113 #endif /* __LINUX_NET_SCM_H */