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1 | #ifndef __LINUX_NET_SCM_H | |
2 | #define __LINUX_NET_SCM_H | |
3 | ||
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> | |
9 | ||
10 | /* Well, we should have at least one descriptor open | |
11 | * to accept passed FDs 8) | |
12 | */ | |
13 | #define SCM_MAX_FD 253 | |
14 | ||
15 | struct scm_fp_list { | |
16 | struct list_head list; | |
17 | short count; | |
18 | short max; | |
19 | struct file *fp[SCM_MAX_FD]; | |
20 | }; | |
21 | ||
22 | struct scm_cookie { | |
23 | struct pid *pid; /* Skb credentials */ | |
24 | const struct cred *cred; | |
25 | struct scm_fp_list *fp; /* Passed files */ | |
26 | struct ucred creds; /* Skb credentials */ | |
27 | #ifdef CONFIG_SECURITY_NETWORK | |
28 | u32 secid; /* Passed security ID */ | |
29 | #endif | |
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 | ||
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 | ||
48 | static __inline__ void scm_set_cred(struct scm_cookie *scm, | |
49 | struct pid *pid, const struct cred *cred) | |
50 | { | |
51 | scm->pid = get_pid(pid); | |
52 | scm->cred = get_cred(cred); | |
53 | cred_to_ucred(pid, cred, &scm->creds); | |
54 | } | |
55 | ||
56 | static __inline__ void scm_destroy_cred(struct scm_cookie *scm) | |
57 | { | |
58 | put_pid(scm->pid); | |
59 | scm->pid = NULL; | |
60 | ||
61 | if (scm->cred) | |
62 | put_cred(scm->cred); | |
63 | scm->cred = NULL; | |
64 | } | |
65 | ||
66 | static __inline__ void scm_destroy(struct scm_cookie *scm) | |
67 | { | |
68 | scm_destroy_cred(scm); | |
69 | if (scm && scm->fp) | |
70 | __scm_destroy(scm); | |
71 | } | |
72 | ||
73 | static __inline__ int scm_send(struct socket *sock, struct msghdr *msg, | |
74 | struct scm_cookie *scm) | |
75 | { | |
76 | scm_set_cred(scm, task_tgid(current), current_cred()); | |
77 | scm->fp = NULL; | |
78 | unix_get_peersec_dgram(sock, scm); | |
79 | if (msg->msg_controllen <= 0) | |
80 | return 0; | |
81 | return __scm_send(sock, msg, scm); | |
82 | } | |
83 | ||
84 | #ifdef CONFIG_SECURITY_NETWORK | |
85 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
86 | { | |
87 | char *secdata; | |
88 | u32 seclen; | |
89 | int err; | |
90 | ||
91 | if (test_bit(SOCK_PASSSEC, &sock->flags)) { | |
92 | err = security_secid_to_secctx(scm->secid, &secdata, &seclen); | |
93 | ||
94 | if (!err) { | |
95 | put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata); | |
96 | security_release_secctx(secdata, seclen); | |
97 | } | |
98 | } | |
99 | } | |
100 | #else | |
101 | static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm) | |
102 | { } | |
103 | #endif /* CONFIG_SECURITY_NETWORK */ | |
104 | ||
105 | static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg, | |
106 | struct scm_cookie *scm, int flags) | |
107 | { | |
108 | if (!msg->msg_control) { | |
109 | if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp) | |
110 | msg->msg_flags |= MSG_CTRUNC; | |
111 | scm_destroy(scm); | |
112 | return; | |
113 | } | |
114 | ||
115 | if (test_bit(SOCK_PASSCRED, &sock->flags)) | |
116 | put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds); | |
117 | ||
118 | scm_destroy_cred(scm); | |
119 | ||
120 | scm_passec(sock, msg, scm); | |
121 | ||
122 | if (!scm->fp) | |
123 | return; | |
124 | ||
125 | scm_detach_fds(msg, scm); | |
126 | } | |
127 | ||
128 | ||
129 | #endif /* __LINUX_NET_SCM_H */ | |
130 |