tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __LINUX_NET_SCM_H
2#define __LINUX_NET_SCM_H
3
4#include <linux/limits.h>
5#include <linux/net.h>
6
7/* Well, we should have at least one descriptor open
8 * to accept passed FDs 8)
9 */
10#define SCM_MAX_FD (OPEN_MAX-1)
11
12struct scm_fp_list
13{
14 int count;
15 struct file *fp[SCM_MAX_FD];
16};
17
18struct scm_cookie
19{
20 struct ucred creds; /* Skb credentials */
21 struct scm_fp_list *fp; /* Passed files */
22#ifdef CONFIG_SECURITY_NETWORK
23 char *secdata; /* Security context */
24 u32 seclen; /* Security length */
25#endif
26 unsigned long seq; /* Connection seqno */
27};
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
35static __inline__ void scm_destroy(struct scm_cookie *scm)
36{
37 if (scm && scm->fp)
38 __scm_destroy(scm);
39}
40
41static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
42 struct scm_cookie *scm)
43{
44 struct task_struct *p = current;
45 scm->creds.uid = p->uid;
46 scm->creds.gid = p->gid;
47 scm->creds.pid = p->tgid;
48 scm->fp = NULL;
49 scm->seq = 0;
50 if (msg->msg_controllen <= 0)
51 return 0;
52 return __scm_send(sock, msg, scm);
53}
54
55#ifdef CONFIG_SECURITY_NETWORK
56static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
57{
58 if (test_bit(SOCK_PASSSEC, &sock->flags) && scm->secdata != NULL)
59 put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, scm->seclen, scm->secdata);
60}
61#else
62static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
63{ }
64#endif /* CONFIG_SECURITY_NETWORK */
65
66static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
67 struct scm_cookie *scm, int flags)
68{
69 if (!msg->msg_control)
70 {
71 if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
72 msg->msg_flags |= MSG_CTRUNC;
73 scm_destroy(scm);
74 return;
75 }
76
77 if (test_bit(SOCK_PASSCRED, &sock->flags))
78 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
79
80 scm_passec(sock, msg, scm);
81
82 if (!scm->fp)
83 return;
84
85 scm_detach_fds(msg, scm);
86}
87
88
89#endif /* __LINUX_NET_SCM_H */
90