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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __LINUX_NET_SCM_H
2#define __LINUX_NET_SCM_H
3
4#include <linux/limits.h>
5#include <linux/net.h>
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07006#include <linux/security.h>
Pavel Emelyanovb4888932007-10-18 23:40:14 -07007#include <linux/pid.h>
8#include <linux/nsproxy.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10/* Well, we should have at least one descriptor open
11 * to accept passed FDs 8)
12 */
Roland McGrathc09edd62007-07-17 04:03:48 -070013#define SCM_MAX_FD 255
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000015struct scm_fp_list {
David Millerf8d570a2008-11-06 00:37:40 -080016 struct list_head list;
17 int count;
18 struct file *fp[SCM_MAX_FD];
Linus Torvalds1da177e2005-04-16 15:20:36 -070019};
20
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000021struct scm_cookie {
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 struct ucred creds; /* Skb credentials */
23 struct scm_fp_list *fp; /* Passed files */
Catherine Zhang877ce7c2006-06-29 12:27:47 -070024#ifdef CONFIG_SECURITY_NETWORK
Catherine Zhangdc49c1f2006-08-02 14:12:06 -070025 u32 secid; /* Passed security ID */
Catherine Zhang877ce7c2006-06-29 12:27:47 -070026#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070027};
28
29extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
30extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
31extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
32extern void __scm_destroy(struct scm_cookie *scm);
33extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
34
Catherine Zhangdc49c1f2006-08-02 14:12:06 -070035#ifdef CONFIG_SECURITY_NETWORK
36static __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
41static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
42{ }
43#endif /* CONFIG_SECURITY_NETWORK */
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045static __inline__ void scm_destroy(struct scm_cookie *scm)
46{
47 if (scm && scm->fp)
48 __scm_destroy(scm);
49}
50
51static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
52 struct scm_cookie *scm)
53{
Benjamin LaHaise1d541dd2006-03-20 21:31:51 -080054 struct task_struct *p = current;
David Howells8192b0c2008-11-14 10:39:10 +110055 scm->creds.uid = current_uid();
56 scm->creds.gid = current_gid();
Pavel Emelyanovb4888932007-10-18 23:40:14 -070057 scm->creds.pid = task_tgid_vnr(p);
Benjamin LaHaise1d541dd2006-03-20 21:31:51 -080058 scm->fp = NULL;
Catherine Zhangdc49c1f2006-08-02 14:12:06 -070059 unix_get_peersec_dgram(sock, scm);
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 if (msg->msg_controllen <= 0)
61 return 0;
62 return __scm_send(sock, msg, scm);
63}
64
Catherine Zhang877ce7c2006-06-29 12:27:47 -070065#ifdef CONFIG_SECURITY_NETWORK
66static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
67{
Catherine Zhangdc49c1f2006-08-02 14:12:06 -070068 char *secdata;
69 u32 seclen;
70 int err;
71
72 if (test_bit(SOCK_PASSSEC, &sock->flags)) {
73 err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
74
75 if (!err) {
76 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
77 security_release_secctx(secdata, seclen);
78 }
79 }
Catherine Zhang877ce7c2006-06-29 12:27:47 -070080}
81#else
82static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
83{ }
84#endif /* CONFIG_SECURITY_NETWORK */
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
87 struct scm_cookie *scm, int flags)
88{
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +000089 if (!msg->msg_control) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
91 msg->msg_flags |= MSG_CTRUNC;
92 scm_destroy(scm);
93 return;
94 }
95
96 if (test_bit(SOCK_PASSCRED, &sock->flags))
97 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
98
Catherine Zhang877ce7c2006-06-29 12:27:47 -070099 scm_passec(sock, msg, scm);
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 if (!scm->fp)
102 return;
103
104 scm_detach_fds(msg, scm);
105}
106
107
108#endif /* __LINUX_NET_SCM_H */
109