Commit | Line | Data |
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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> |
1da177e4 LT |
7 | |
8 | /* Well, we should have at least one descriptor open | |
9 | * to accept passed FDs 8) | |
10 | */ | |
c09edd6e | 11 | #define SCM_MAX_FD 255 |
1da177e4 LT |
12 | |
13 | struct scm_fp_list | |
14 | { | |
15 | int count; | |
16 | struct file *fp[SCM_MAX_FD]; | |
17 | }; | |
18 | ||
19 | struct scm_cookie | |
20 | { | |
21 | struct ucred creds; /* Skb credentials */ | |
22 | struct scm_fp_list *fp; /* Passed files */ | |
877ce7c1 | 23 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 24 | u32 secid; /* Passed security ID */ |
877ce7c1 | 25 | #endif |
1da177e4 LT |
26 | unsigned long seq; /* Connection seqno */ |
27 | }; | |
28 | ||
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); | |
34 | ||
dc49c1f9 CZ |
35 | #ifdef CONFIG_SECURITY_NETWORK |
36 | static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) | |
37 | { | |
38 | security_socket_getpeersec_dgram(sock, NULL, &scm->secid); | |
39 | } | |
40 | #else | |
41 | static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) | |
42 | { } | |
43 | #endif /* CONFIG_SECURITY_NETWORK */ | |
44 | ||
1da177e4 LT |
45 | static __inline__ void scm_destroy(struct scm_cookie *scm) |
46 | { | |
47 | if (scm && scm->fp) | |
48 | __scm_destroy(scm); | |
49 | } | |
50 | ||
51 | static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, | |
52 | struct scm_cookie *scm) | |
53 | { | |
1d541ddd BL |
54 | struct task_struct *p = current; |
55 | scm->creds.uid = p->uid; | |
56 | scm->creds.gid = p->gid; | |
57 | scm->creds.pid = p->tgid; | |
58 | scm->fp = NULL; | |
59 | scm->seq = 0; | |
dc49c1f9 | 60 | unix_get_peersec_dgram(sock, scm); |
1da177e4 LT |
61 | if (msg->msg_controllen <= 0) |
62 | return 0; | |
63 | return __scm_send(sock, msg, scm); | |
64 | } | |
65 | ||
877ce7c1 CZ |
66 | #ifdef CONFIG_SECURITY_NETWORK |
67 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
68 | { | |
dc49c1f9 CZ |
69 | char *secdata; |
70 | u32 seclen; | |
71 | int err; | |
72 | ||
73 | if (test_bit(SOCK_PASSSEC, &sock->flags)) { | |
74 | err = security_secid_to_secctx(scm->secid, &secdata, &seclen); | |
75 | ||
76 | if (!err) { | |
77 | put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); | |
78 | security_release_secctx(secdata, seclen); | |
79 | } | |
80 | } | |
877ce7c1 CZ |
81 | } |
82 | #else | |
83 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
84 | { } | |
85 | #endif /* CONFIG_SECURITY_NETWORK */ | |
86 | ||
1da177e4 LT |
87 | static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg, |
88 | struct scm_cookie *scm, int flags) | |
89 | { | |
90 | if (!msg->msg_control) | |
91 | { | |
92 | if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp) | |
93 | msg->msg_flags |= MSG_CTRUNC; | |
94 | scm_destroy(scm); | |
95 | return; | |
96 | } | |
97 | ||
98 | if (test_bit(SOCK_PASSCRED, &sock->flags)) | |
99 | put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds); | |
100 | ||
877ce7c1 CZ |
101 | scm_passec(sock, msg, scm); |
102 | ||
1da177e4 LT |
103 | if (!scm->fp) |
104 | return; | |
105 | ||
106 | scm_detach_fds(msg, scm); | |
107 | } | |
108 | ||
109 | ||
110 | #endif /* __LINUX_NET_SCM_H */ | |
111 |