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1da177e4 LT |
1 | #ifndef __LINUX_NET_SCM_H |
2 | #define __LINUX_NET_SCM_H | |
3 | ||
4 | #include <linux/limits.h> | |
5 | #include <linux/net.h> | |
dc49c1f9 | 6 | #include <linux/security.h> |
b488893a PE |
7 | #include <linux/pid.h> |
8 | #include <linux/nsproxy.h> | |
1da177e4 LT |
9 | |
10 | /* Well, we should have at least one descriptor open | |
11 | * to accept passed FDs 8) | |
12 | */ | |
c09edd6e | 13 | #define SCM_MAX_FD 255 |
1da177e4 LT |
14 | |
15 | struct scm_fp_list | |
16 | { | |
f8d570a4 DM |
17 | struct list_head list; |
18 | int count; | |
19 | struct file *fp[SCM_MAX_FD]; | |
1da177e4 LT |
20 | }; |
21 | ||
22 | struct scm_cookie | |
23 | { | |
24 | struct ucred creds; /* Skb credentials */ | |
25 | struct scm_fp_list *fp; /* Passed files */ | |
877ce7c1 | 26 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 27 | u32 secid; /* Passed security ID */ |
877ce7c1 | 28 | #endif |
1da177e4 LT |
29 | unsigned long seq; /* Connection seqno */ |
30 | }; | |
31 | ||
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); | |
37 | ||
dc49c1f9 CZ |
38 | #ifdef CONFIG_SECURITY_NETWORK |
39 | static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) | |
40 | { | |
41 | security_socket_getpeersec_dgram(sock, NULL, &scm->secid); | |
42 | } | |
43 | #else | |
44 | static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) | |
45 | { } | |
46 | #endif /* CONFIG_SECURITY_NETWORK */ | |
47 | ||
1da177e4 LT |
48 | static __inline__ void scm_destroy(struct scm_cookie *scm) |
49 | { | |
50 | if (scm && scm->fp) | |
51 | __scm_destroy(scm); | |
52 | } | |
53 | ||
54 | static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, | |
55 | struct scm_cookie *scm) | |
56 | { | |
1d541ddd | 57 | struct task_struct *p = current; |
8192b0c4 DH |
58 | scm->creds.uid = current_uid(); |
59 | scm->creds.gid = current_gid(); | |
b488893a | 60 | scm->creds.pid = task_tgid_vnr(p); |
1d541ddd BL |
61 | scm->fp = NULL; |
62 | scm->seq = 0; | |
dc49c1f9 | 63 | unix_get_peersec_dgram(sock, scm); |
1da177e4 LT |
64 | if (msg->msg_controllen <= 0) |
65 | return 0; | |
66 | return __scm_send(sock, msg, scm); | |
67 | } | |
68 | ||
877ce7c1 CZ |
69 | #ifdef CONFIG_SECURITY_NETWORK |
70 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
71 | { | |
dc49c1f9 CZ |
72 | char *secdata; |
73 | u32 seclen; | |
74 | int err; | |
75 | ||
76 | if (test_bit(SOCK_PASSSEC, &sock->flags)) { | |
77 | err = security_secid_to_secctx(scm->secid, &secdata, &seclen); | |
78 | ||
79 | if (!err) { | |
80 | put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); | |
81 | security_release_secctx(secdata, seclen); | |
82 | } | |
83 | } | |
877ce7c1 CZ |
84 | } |
85 | #else | |
86 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
87 | { } | |
88 | #endif /* CONFIG_SECURITY_NETWORK */ | |
89 | ||
1da177e4 LT |
90 | static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg, |
91 | struct scm_cookie *scm, int flags) | |
92 | { | |
93 | if (!msg->msg_control) | |
94 | { | |
95 | if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp) | |
96 | msg->msg_flags |= MSG_CTRUNC; | |
97 | scm_destroy(scm); | |
98 | return; | |
99 | } | |
100 | ||
101 | if (test_bit(SOCK_PASSCRED, &sock->flags)) | |
102 | put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds); | |
103 | ||
877ce7c1 CZ |
104 | scm_passec(sock, msg, scm); |
105 | ||
1da177e4 LT |
106 | if (!scm->fp) |
107 | return; | |
108 | ||
109 | scm_detach_fds(msg, scm); | |
110 | } | |
111 | ||
112 | ||
113 | #endif /* __LINUX_NET_SCM_H */ | |
114 |