[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
};

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 = current_uid();
	scm->creds.gid = current_gid();
	scm->creds.pid = task_tgid_vnr(p);
	scm->fp = NULL;
	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
	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 255
	14
	15	struct scm_fp_list {
	16	struct list_head list;
	17	int count;
	18	struct file *fp[SCM_MAX_FD];
	19	};
	20
	21	struct scm_cookie {
	22	struct ucred creds; /* Skb credentials */
	23	struct scm_fp_list fp; / Passed files */
	24	#ifdef CONFIG_SECURITY_NETWORK
	25	u32 secid; /* Passed security ID */
	26	#endif
	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
	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
	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	{
	54	struct task_struct *p = current;
	55	scm->creds.uid = current_uid();
	56	scm->creds.gid = current_gid();
	57	scm->creds.pid = task_tgid_vnr(p);
	58	scm->fp = NULL;
	59	unix_get_peersec_dgram(sock, scm);
	60	if (msg->msg_controllen <= 0)
	61	return 0;
	62	return __scm_send(sock, msg, scm);
	63	}
	64
	65	#ifdef CONFIG_SECURITY_NETWORK
	66	static inline void scm_passec(struct socket sock, struct msghdr msg, struct scm_cookie *scm)
	67	{
	68	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	}
	80	}
	81	#else
	82	static inline void scm_passec(struct socket sock, struct msghdr msg, struct scm_cookie *scm)
	83	{ }
	84	#endif /* CONFIG_SECURITY_NETWORK */
	85
	86	static __inline__ void scm_recv(struct socket sock, struct msghdr msg,
	87	struct scm_cookie *scm, int flags)
	88	{
	89	if (!msg->msg_control) {
	90	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
	99	scm_passec(sock, msg, scm);
	100
	101	if (!scm->fp)
	102	return;
	103
	104	scm_detach_fds(msg, scm);
	105	}
	106
	107
	108	#endif /* __LINUX_NET_SCM_H */
	109