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 user_struct *user;
20 struct file *fp[SCM_MAX_FD];
24 struct pid *pid; /* Skb credentials */
25 const struct cred *cred;
26 struct scm_fp_list *fp; /* Passed files */
27 struct ucred creds; /* Skb credentials */
28 #ifdef CONFIG_SECURITY_NETWORK
29 u32 secid; /* Passed security ID */
33 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
34 extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
35 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
36 extern void __scm_destroy(struct scm_cookie *scm);
37 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
39 #ifdef CONFIG_SECURITY_NETWORK
40 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
42 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
45 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
47 #endif /* CONFIG_SECURITY_NETWORK */
49 static __inline__ void scm_set_cred(struct scm_cookie *scm,
50 struct pid *pid, const struct cred *cred)
52 scm->pid = get_pid(pid);
53 scm->cred = cred ? get_cred(cred) : NULL;
54 cred_real_to_ucred(pid, cred, &scm->creds);
57 static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
67 static __inline__ void scm_destroy(struct scm_cookie *scm)
69 scm_destroy_cred(scm);
74 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
75 struct scm_cookie *scm, bool forcecreds)
77 memset(scm, 0, sizeof(*scm));
79 scm_set_cred(scm, task_tgid(current), current_cred());
80 unix_get_peersec_dgram(sock, scm);
81 if (msg->msg_controllen <= 0)
83 return __scm_send(sock, msg, scm);
86 #ifdef CONFIG_SECURITY_NETWORK
87 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
93 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
94 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
97 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
98 security_release_secctx(secdata, seclen);
103 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
105 #endif /* CONFIG_SECURITY_NETWORK */
107 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
108 struct scm_cookie *scm, int flags)
110 if (!msg->msg_control) {
111 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
112 msg->msg_flags |= MSG_CTRUNC;
117 if (test_bit(SOCK_PASSCRED, &sock->flags))
118 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
120 scm_destroy_cred(scm);
122 scm_passec(sock, msg, scm);
127 scm_detach_fds(msg, scm);
131 #endif /* __LINUX_NET_SCM_H */