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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 | 14 | |
fd2c3ef7 | 15 | struct scm_fp_list { |
f8d570a4 DM |
16 | struct list_head list; |
17 | int count; | |
18 | struct file *fp[SCM_MAX_FD]; | |
1da177e4 LT |
19 | }; |
20 | ||
fd2c3ef7 | 21 | struct scm_cookie { |
257b5358 EB |
22 | struct pid *pid; /* Skb credentials */ |
23 | const struct cred *cred; | |
1da177e4 | 24 | struct scm_fp_list *fp; /* Passed files */ |
812e876e | 25 | struct ucred creds; /* Skb credentials */ |
877ce7c1 | 26 | #ifdef CONFIG_SECURITY_NETWORK |
dc49c1f9 | 27 | u32 secid; /* Passed security ID */ |
877ce7c1 | 28 | #endif |
1da177e4 LT |
29 | }; |
30 | ||
31 | extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm); | |
32 | extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm); | |
33 | extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm); | |
34 | extern void __scm_destroy(struct scm_cookie *scm); | |
35 | extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl); | |
36 | ||
dc49c1f9 CZ |
37 | #ifdef CONFIG_SECURITY_NETWORK |
38 | static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) | |
39 | { | |
40 | security_socket_getpeersec_dgram(sock, NULL, &scm->secid); | |
41 | } | |
42 | #else | |
43 | static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm) | |
44 | { } | |
45 | #endif /* CONFIG_SECURITY_NETWORK */ | |
46 | ||
257b5358 EB |
47 | static __inline__ void scm_set_cred(struct scm_cookie *scm, |
48 | struct pid *pid, const struct cred *cred) | |
49 | { | |
50 | scm->pid = get_pid(pid); | |
51 | scm->cred = get_cred(cred); | |
52 | cred_to_ucred(pid, cred, &scm->creds); | |
53 | } | |
54 | ||
55 | static __inline__ void scm_destroy_cred(struct scm_cookie *scm) | |
56 | { | |
57 | put_pid(scm->pid); | |
58 | scm->pid = NULL; | |
59 | ||
60 | if (scm->cred) | |
61 | put_cred(scm->cred); | |
62 | scm->cred = NULL; | |
63 | } | |
64 | ||
1da177e4 LT |
65 | static __inline__ void scm_destroy(struct scm_cookie *scm) |
66 | { | |
257b5358 | 67 | scm_destroy_cred(scm); |
1da177e4 LT |
68 | if (scm && scm->fp) |
69 | __scm_destroy(scm); | |
70 | } | |
71 | ||
72 | static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, | |
73 | struct scm_cookie *scm) | |
74 | { | |
257b5358 | 75 | scm_set_cred(scm, task_tgid(current), current_cred()); |
1d541ddd | 76 | scm->fp = NULL; |
dc49c1f9 | 77 | unix_get_peersec_dgram(sock, scm); |
1da177e4 LT |
78 | if (msg->msg_controllen <= 0) |
79 | return 0; | |
80 | return __scm_send(sock, msg, scm); | |
81 | } | |
82 | ||
877ce7c1 CZ |
83 | #ifdef CONFIG_SECURITY_NETWORK |
84 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
85 | { | |
dc49c1f9 CZ |
86 | char *secdata; |
87 | u32 seclen; | |
88 | int err; | |
89 | ||
90 | if (test_bit(SOCK_PASSSEC, &sock->flags)) { | |
91 | err = security_secid_to_secctx(scm->secid, &secdata, &seclen); | |
92 | ||
93 | if (!err) { | |
94 | put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); | |
95 | security_release_secctx(secdata, seclen); | |
96 | } | |
97 | } | |
877ce7c1 CZ |
98 | } |
99 | #else | |
100 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
101 | { } | |
102 | #endif /* CONFIG_SECURITY_NETWORK */ | |
103 | ||
1da177e4 LT |
104 | static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg, |
105 | struct scm_cookie *scm, int flags) | |
106 | { | |
fd2c3ef7 | 107 | if (!msg->msg_control) { |
1da177e4 LT |
108 | if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp) |
109 | msg->msg_flags |= MSG_CTRUNC; | |
110 | scm_destroy(scm); | |
111 | return; | |
112 | } | |
113 | ||
114 | if (test_bit(SOCK_PASSCRED, &sock->flags)) | |
115 | put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds); | |
116 | ||
257b5358 EB |
117 | scm_destroy_cred(scm); |
118 | ||
877ce7c1 CZ |
119 | scm_passec(sock, msg, scm); |
120 | ||
1da177e4 LT |
121 | if (!scm->fp) |
122 | return; | |
123 | ||
124 | scm_detach_fds(msg, scm); | |
125 | } | |
126 | ||
127 | ||
128 | #endif /* __LINUX_NET_SCM_H */ | |
129 |