[net-next-2.6.git] / include / net / scm.h

#ifndef __LINUX_NET_SCM_H
#define __LINUX_NET_SCM_H

#include <linux/limits.h>
#include <linux/net.h>
#include <linux/security.h>
#include <linux/pid.h>
#include <linux/nsproxy.h>

/* Well, we should have at least one descriptor open
 * to accept passed FDs 8)
 */
#define SCM_MAX_FD	255

struct scm_fp_list
{
	struct list_head	list;
	int			count;
	struct file		*fp[SCM_MAX_FD];
};

struct scm_cookie
{
	struct ucred		creds;		/* Skb credentials	*/
	struct scm_fp_list	*fp;		/* Passed files		*/
#ifdef CONFIG_SECURITY_NETWORK
	u32			secid;		/* Passed security ID 	*/
#endif
	unsigned long		seq;		/* Connection seqno	*/
};

extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
extern void __scm_destroy(struct scm_cookie *scm);
extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);

#ifdef CONFIG_SECURITY_NETWORK
static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
{
	security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
}
#else
static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
{ }
#endif /* CONFIG_SECURITY_NETWORK */

static __inline__ void scm_destroy(struct scm_cookie *scm)
{
	if (scm && scm->fp)
		__scm_destroy(scm);
}

static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
			       struct scm_cookie *scm)
{
	struct task_struct *p = current;
	scm->creds.uid = p->uid;
	scm->creds.gid = p->gid;
	scm->creds.pid = task_tgid_vnr(p);
	scm->fp = NULL;
	scm->seq = 0;
	unix_get_peersec_dgram(sock, scm);
	if (msg->msg_controllen <= 0)
		return 0;
	return __scm_send(sock, msg, scm);
}

#ifdef CONFIG_SECURITY_NETWORK
static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
{
	char *secdata;
	u32 seclen;
	int err;

	if (test_bit(SOCK_PASSSEC, &sock->flags)) {
		err = security_secid_to_secctx(scm->secid, &secdata, &seclen);

		if (!err) {
			put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
			security_release_secctx(secdata, seclen);
		}
	}
}
#else
static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
{ }
#endif /* CONFIG_SECURITY_NETWORK */

static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
				struct scm_cookie *scm, int flags)
{
	if (!msg->msg_control)
	{
		if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
			msg->msg_flags |= MSG_CTRUNC;
		scm_destroy(scm);
		return;
	}

	if (test_bit(SOCK_PASSCRED, &sock->flags))
		put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);

	scm_passec(sock, msg, scm);

	if (!scm->fp)
		return;
	
	scm_detach_fds(msg, scm);
}


#endif /* __LINUX_NET_SCM_H */
Commit	Line	Data
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>
b488893a PE	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 LT	14
	15	struct scm_fp_list
	16	{
f8d570a4 DM	17	struct list_head list;
	18	int count;
	19	struct file *fp[SCM_MAX_FD];
1da177e4 LT	20	};
	21
	22	struct scm_cookie
	23	{
	24	struct ucred creds; /* Skb credentials */
	25	struct scm_fp_list fp; / Passed files */
877ce7c1	26	#ifdef CONFIG_SECURITY_NETWORK
dc49c1f9	27	u32 secid; /* Passed security ID */
877ce7c1	28	#endif
1da177e4 LT	29	unsigned long seq; /* Connection seqno */
	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
dc49c1f9 CZ	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
1da177e4 LT	48	static __inline__ void scm_destroy(struct scm_cookie *scm)
	49	{
	50	if (scm && scm->fp)
	51	__scm_destroy(scm);
	52	}
	53
	54	static __inline__ int scm_send(struct socket sock, struct msghdr msg,
	55	struct scm_cookie *scm)
	56	{
1d541ddd BL	57	struct task_struct *p = current;
	58	scm->creds.uid = p->uid;
	59	scm->creds.gid = p->gid;
b488893a	60	scm->creds.pid = task_tgid_vnr(p);
1d541ddd BL	61	scm->fp = NULL;
1d541ddd BL	62	scm->seq = 0;
dc49c1f9	63	unix_get_peersec_dgram(sock, scm);
1da177e4 LT	64	if (msg->msg_controllen <= 0)
	65	return 0;
	66	return __scm_send(sock, msg, scm);
	67	}
	68
877ce7c1 CZ	69	#ifdef CONFIG_SECURITY_NETWORK
	70	static inline void scm_passec(struct socket sock, struct msghdr msg, struct scm_cookie *scm)
	71	{
dc49c1f9 CZ	72	char *secdata;
	73	u32 seclen;
	74	int err;
	75
	76	if (test_bit(SOCK_PASSSEC, &sock->flags)) {
	77	err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
	78
	79	if (!err) {
	80	put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
	81	security_release_secctx(secdata, seclen);
	82	}
	83	}
877ce7c1 CZ	84	}
	85	#else
	86	static inline void scm_passec(struct socket sock, struct msghdr msg, struct scm_cookie *scm)
	87	{ }
	88	#endif /* CONFIG_SECURITY_NETWORK */
	89
1da177e4 LT	90	static __inline__ void scm_recv(struct socket sock, struct msghdr msg,
	91	struct scm_cookie *scm, int flags)
	92	{
	93	if (!msg->msg_control)
	94	{
	95	if (test_bit(SOCK_PASSCRED, &sock->flags) \|\| scm->fp)
	96	msg->msg_flags \|= MSG_CTRUNC;
	97	scm_destroy(scm);
	98	return;
	99	}
	100
	101	if (test_bit(SOCK_PASSCRED, &sock->flags))
	102	put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
	103
877ce7c1 CZ	104	scm_passec(sock, msg, scm);
877ce7c1 CZ	105
1da177e4 LT	106	if (!scm->fp)
	107	return;
	108
	109	scm_detach_fds(msg, scm);
	110	}
	111
	112
	113	#endif /* __LINUX_NET_SCM_H */
	114