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 253
16 struct list_head list;
19 struct file *fp[SCM_MAX_FD];
23 struct pid *pid; /* Skb credentials */
24 const struct cred *cred;
25 struct scm_fp_list *fp; /* Passed files */
26 struct ucred creds; /* Skb credentials */
27 #ifdef CONFIG_SECURITY_NETWORK
28 u32 secid; /* Passed security ID */
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_set_cred(struct scm_cookie *scm,
49 struct pid *pid, const struct cred *cred)
51 scm->pid = get_pid(pid);
52 scm->cred = get_cred(cred);
53 cred_to_ucred(pid, cred, &scm->creds);
56 static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
66 static __inline__ void scm_destroy(struct scm_cookie *scm)
68 scm_destroy_cred(scm);
73 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
74 struct scm_cookie *scm)
76 scm_set_cred(scm, task_tgid(current), current_cred());
78 unix_get_peersec_dgram(sock, scm);
79 if (msg->msg_controllen <= 0)
81 return __scm_send(sock, msg, scm);
84 #ifdef CONFIG_SECURITY_NETWORK
85 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
91 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
92 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
95 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
96 security_release_secctx(secdata, seclen);
101 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
103 #endif /* CONFIG_SECURITY_NETWORK */
105 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
106 struct scm_cookie *scm, int flags)
108 if (!msg->msg_control) {
109 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
110 msg->msg_flags |= MSG_CTRUNC;
115 if (test_bit(SOCK_PASSCRED, &sock->flags))
116 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
118 scm_destroy_cred(scm);
120 scm_passec(sock, msg, scm);
125 scm_detach_fds(msg, scm);
129 #endif /* __LINUX_NET_SCM_H */