mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / include / net / scm.h
blobd00cd43a990c82af09296f838ac16d3b0295c154
1 #ifndef __LINUX_NET_SCM_H
2 #define __LINUX_NET_SCM_H
4 #include <linux/limits.h>
5 #include <linux/net.h>
6 #include <linux/security.h>
7 #include <linux/pid.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
15 struct scm_creds {
16 u32 pid;
17 kuid_t uid;
18 kgid_t gid;
21 struct scm_fp_list {
22 short count;
23 short max;
24 struct user_struct *user;
25 struct file *fp[SCM_MAX_FD];
28 struct scm_cookie {
29 struct pid *pid; /* Skb credentials */
30 struct scm_fp_list *fp; /* Passed files */
31 struct scm_creds creds; /* Skb credentials */
32 #ifdef CONFIG_SECURITY_NETWORK
33 u32 secid; /* Passed security ID */
34 #endif
37 extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
38 extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
39 extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
40 extern void __scm_destroy(struct scm_cookie *scm);
41 extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
43 #ifdef CONFIG_SECURITY_NETWORK
44 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
46 security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
48 #else
49 static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
50 { }
51 #endif /* CONFIG_SECURITY_NETWORK */
53 static __inline__ void scm_set_cred(struct scm_cookie *scm,
54 struct pid *pid, kuid_t uid, kgid_t gid)
56 scm->pid = get_pid(pid);
57 scm->creds.pid = pid_vnr(pid);
58 scm->creds.uid = uid;
59 scm->creds.gid = gid;
62 static __inline__ void scm_destroy_cred(struct scm_cookie *scm)
64 put_pid(scm->pid);
65 scm->pid = NULL;
68 static __inline__ void scm_destroy(struct scm_cookie *scm)
70 scm_destroy_cred(scm);
71 if (scm->fp)
72 __scm_destroy(scm);
75 static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
76 struct scm_cookie *scm, bool forcecreds)
78 memset(scm, 0, sizeof(*scm));
79 scm->creds.uid = INVALID_UID;
80 scm->creds.gid = INVALID_GID;
81 if (forcecreds)
82 scm_set_cred(scm, task_tgid(current), current_uid(), current_gid());
83 unix_get_peersec_dgram(sock, scm);
84 if (msg->msg_controllen <= 0)
85 return 0;
86 return __scm_send(sock, msg, scm);
89 #ifdef CONFIG_SECURITY_NETWORK
90 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
92 char *secdata;
93 u32 seclen;
94 int err;
96 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
97 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
99 if (!err) {
100 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
101 security_release_secctx(secdata, seclen);
105 #else
106 static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
108 #endif /* CONFIG_SECURITY_NETWORK */
110 static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
111 struct scm_cookie *scm, int flags)
113 if (!msg->msg_control) {
114 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
115 msg->msg_flags |= MSG_CTRUNC;
116 scm_destroy(scm);
117 return;
120 if (test_bit(SOCK_PASSCRED, &sock->flags)) {
121 struct user_namespace *current_ns = current_user_ns();
122 struct ucred ucreds = {
123 .pid = scm->creds.pid,
124 .uid = from_kuid_munged(current_ns, scm->creds.uid),
125 .gid = from_kgid_munged(current_ns, scm->creds.gid),
127 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(ucreds), &ucreds);
130 scm_destroy_cred(scm);
132 scm_passec(sock, msg, scm);
134 if (!scm->fp)
135 return;
137 scm_detach_fds(msg, scm);
141 #endif /* __LINUX_NET_SCM_H */