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
16 struct list_head list;
18 struct file *fp[SCM_MAX_FD];
22 struct ucred creds; /* Skb credentials */
23 struct scm_fp_list *fp; /* Passed files */
24 #ifdef CONFIG_SECURITY_NETWORK
25 u32 secid; /* Passed security ID */
29 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
30 extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
31 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
32 extern void __scm_destroy(struct scm_cookie *scm);
33 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
35 #ifdef CONFIG_SECURITY_NETWORK
36 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
38 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
41 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
43 #endif /* CONFIG_SECURITY_NETWORK */
45 static __inline__ void scm_destroy(struct scm_cookie *scm)
51 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
52 struct scm_cookie *scm)
54 struct task_struct *p = current;
55 scm->creds.uid = current_uid();
56 scm->creds.gid = current_gid();
57 scm->creds.pid = task_tgid_vnr(p);
59 unix_get_peersec_dgram(sock, scm);
60 if (msg->msg_controllen <= 0)
62 return __scm_send(sock, msg, scm);
65 #ifdef CONFIG_SECURITY_NETWORK
66 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
72 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
73 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
76 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
77 security_release_secctx(secdata, seclen);
82 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
84 #endif /* CONFIG_SECURITY_NETWORK */
86 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
87 struct scm_cookie *scm, int flags)
89 if (!msg->msg_control) {
90 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
91 msg->msg_flags |= MSG_CTRUNC;
96 if (test_bit(SOCK_PASSCRED, &sock->flags))
97 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
99 scm_passec(sock, msg, scm);
104 scm_detach_fds(msg, scm);
108 #endif /* __LINUX_NET_SCM_H */