path: root/net/xfrm/xfrm_user.c

/* xfrm_user.c: User interface to configure xfrm engine.
 *
 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
 *
 * Changes:
 *	Mitsuru KANDA @USAGI
 * 	Kazunori MIYAZAWA @USAGI
 * 	Kunihiro Ishiguro <kunihiro@ipinfusion.com>
 * 		IPv6 support
 * 	
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
#include <linux/init.h>
#include <linux/security.h>
#include <net/sock.h>
#include <net/xfrm.h>
#include <asm/uaccess.h>

static struct sock *xfrm_nl;

static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
{
	struct rtattr *rt = xfrma[type - 1];
	struct xfrm_algo *algp;
	int len;

	if (!rt)
		return 0;

	len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
	if (len < 0)
		return -EINVAL;

	algp = RTA_DATA(rt);

	len -= (algp->alg_key_len + 7U) / 8; 
	if (len < 0)
		return -EINVAL;

	switch (type) {
	case XFRMA_ALG_AUTH:
		if (!algp->alg_key_len &&
		    strcmp(algp->alg_name, "digest_null") != 0)
			return -EINVAL;
		break;

	case XFRMA_ALG_CRYPT:
		if (!algp->alg_key_len &&
		    strcmp(algp->alg_name, "cipher_null") != 0)
			return -EINVAL;
		break;

	case XFRMA_ALG_COMP:
		/* Zero length keys are legal.  */
		break;

	default:
		return -EINVAL;
	};

	algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
	return 0;
}

static int verify_encap_tmpl(struct rtattr **xfrma)
{
	struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
	struct xfrm_encap_tmpl *encap;

	if (!rt)
		return 0;

	if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
		return -EINVAL;

	return 0;
}

static int verify_newsa_info(struct xfrm_usersa_info *p,
			     struct rtattr **xfrma)
{
	int err;

	err = -EINVAL;
	switch (p->family) {
	case