[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>

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

struct scm_fp_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 = p->tgid;
	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>
1da177e4 LT	7
	8	/* Well, we should have at least one descriptor open
	9	* to accept passed FDs 8)
	10	*/
c09edd6e	11	#define SCM_MAX_FD 255
1da177e4 LT	12
	13	struct scm_fp_list
	14	{
	15	int count;
	16	struct file *fp[SCM_MAX_FD];
	17	};
	18
	19	struct scm_cookie
	20	{
	21	struct ucred creds; /* Skb credentials */
	22	struct scm_fp_list fp; / Passed files */
877ce7c1	23	#ifdef CONFIG_SECURITY_NETWORK
dc49c1f9	24	u32 secid; /* Passed security ID */
877ce7c1	25	#endif
1da177e4 LT	26	unsigned long seq; /* Connection seqno */
	27	};
	28
	29	extern void scm_detach_fds(struct msghdr msg, struct scm_cookie scm);
	30	extern void scm_detach_fds_compat(struct msghdr msg, struct scm_cookie scm);
	31	extern int __scm_send(struct socket sock, struct msghdr msg, struct scm_cookie *scm);
	32	extern void __scm_destroy(struct scm_cookie *scm);
	33	extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
	34
dc49c1f9 CZ	35	#ifdef CONFIG_SECURITY_NETWORK
	36	static __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
	41	static __inline__ void unix_get_peersec_dgram(struct socket sock, struct scm_cookie scm)
	42	{ }
	43	#endif /* CONFIG_SECURITY_NETWORK */
	44
1da177e4 LT	45	static __inline__ void scm_destroy(struct scm_cookie *scm)
	46	{
	47	if (scm && scm->fp)
	48	__scm_destroy(scm);
	49	}
	50
	51	static __inline__ int scm_send(struct socket sock, struct msghdr msg,
	52	struct scm_cookie *scm)
	53	{
1d541ddd BL	54	struct task_struct *p = current;
	55	scm->creds.uid = p->uid;
	56	scm->creds.gid = p->gid;
	57	scm->creds.pid = p->tgid;
	58	scm->fp = NULL;
	59	scm->seq = 0;
dc49c1f9	60	unix_get_peersec_dgram(sock, scm);
1da177e4 LT	61	if (msg->msg_controllen <= 0)
	62	return 0;
	63	return __scm_send(sock, msg, scm);
	64	}
	65
877ce7c1 CZ	66	#ifdef CONFIG_SECURITY_NETWORK
	67	static inline void scm_passec(struct socket sock, struct msghdr msg, struct scm_cookie *scm)
	68	{
dc49c1f9 CZ	69	char *secdata;
	70	u32 seclen;
	71	int err;
	72
	73	if (test_bit(SOCK_PASSSEC, &sock->flags)) {
	74	err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
	75
	76	if (!err) {
	77	put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
	78	security_release_secctx(secdata, seclen);
	79	}
	80	}
877ce7c1 CZ	81	}
	82	#else
	83	static inline void scm_passec(struct socket sock, struct msghdr msg, struct scm_cookie *scm)
	84	{ }
	85	#endif /* CONFIG_SECURITY_NETWORK */
	86
1da177e4 LT	87	static __inline__ void scm_recv(struct socket sock, struct msghdr msg,
	88	struct scm_cookie *scm, int flags)
	89	{
	90	if (!msg->msg_control)
	91	{
	92	if (test_bit(SOCK_PASSCRED, &sock->flags) \|\| scm->fp)
	93	msg->msg_flags \|= MSG_CTRUNC;
	94	scm_destroy(scm);
	95	return;
	96	}
	97
	98	if (test_bit(SOCK_PASSCRED, &sock->flags))
	99	put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
	100
877ce7c1 CZ	101	scm_passec(sock, msg, scm);
877ce7c1 CZ	102
1da177e4 LT	103	if (!scm->fp)
	104	return;
	105
	106	scm_detach_fds(msg, scm);
	107	}
	108
	109
	110	#endif /* __LINUX_NET_SCM_H */
	111