[deliverable/linux.git] / net / ipv6 / netfilter / ip6t_owner.c

/* Kernel module to match various things tied to sockets associated with
   locally generated outgoing packets. */

/* (C) 2000-2001 Marc Boucher <marc@mbsi.ca>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/file.h>
#include <linux/rcupdate.h>
#include <net/sock.h>

#include <linux/netfilter_ipv6/ip6t_owner.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter/x_tables.h>

MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
MODULE_DESCRIPTION("IP6 tables owner matching module");
MODULE_LICENSE("GPL");


static int
match(const struct sk_buff *skb,
      const struct net_device *in,
      const struct net_device *out,
      const struct xt_match *match,
      const void *matchinfo,
      int offset,
      unsigned int protoff,
      int *hotdrop)
{
	const struct ip6t_owner_info *info = matchinfo;

	if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file)
		return 0;

	if (info->match & IP6T_OWNER_UID) {
		if ((skb->sk->sk_socket->file->f_uid != info->uid) ^
		    !!(info->invert & IP6T_OWNER_UID))
			return 0;
	}

	if (info->match & IP6T_OWNER_GID) {
		if ((skb->sk->sk_socket->file->f_gid != info->gid) ^
		    !!(info->invert & IP6T_OWNER_GID))
			return 0;
	}

	return 1;
}

static int
checkentry(const char *tablename,
	   const void *ip,
	   const struct xt_match *match,
	   void *matchinfo,
	   unsigned int hook_mask)
{
	const struct ip6t_owner_info *info = matchinfo;

	if (info->match & (IP6T_OWNER_PID | IP6T_OWNER_SID)) {
		printk("ipt_owner: pid and sid matching "
		       "not supported anymore\n");
		return 0;
	}
	return 1;
}

static struct xt_match owner_match = {
	.name		= "owner",
	.family		= AF_INET6,
	.match		= match,
	.matchsize	= sizeof(struct ip6t_owner_info),
	.hooks		= (1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING),
	.checkentry	= checkentry,
	.me		= THIS_MODULE,
};

static int __init ip6t_owner_init(void)
{
	return xt_register_match(&owner_match);
}

static void __exit ip6t_owner_fini(void)
{
	xt_unregister_match(&owner_match);
}

module_init(ip6t_owner_init);
module_exit(ip6t_owner_fini);
Commit	Line	Data
1da177e4 LT	1	/* Kernel module to match various things tied to sockets associated with
	2	locally generated outgoing packets. */
	3
	4	/* (C) 2000-2001 Marc Boucher <marc@mbsi.ca>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/skbuff.h>
	13	#include <linux/file.h>
b835996f	14	#include <linux/rcupdate.h>
1da177e4 LT	15	#include <net/sock.h>
	16
	17	#include <linux/netfilter_ipv6/ip6t_owner.h>
	18	#include <linux/netfilter_ipv6/ip6_tables.h>
6709dbbb	19	#include <linux/netfilter/x_tables.h>
1da177e4 LT	20
	21	MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
	22	MODULE_DESCRIPTION("IP6 tables owner matching module");
	23	MODULE_LICENSE("GPL");
	24
1da177e4 LT	25
	26	static int
	27	match(const struct sk_buff *skb,
	28	const struct net_device *in,
	29	const struct net_device *out,
c4986734	30	const struct xt_match *match,
1da177e4 LT	31	const void *matchinfo,
	32	int offset,
	33	unsigned int protoff,
	34	int *hotdrop)
	35	{
	36	const struct ip6t_owner_info *info = matchinfo;
	37
	38	if (!skb->sk \|\| !skb->sk->sk_socket \|\| !skb->sk->sk_socket->file)
	39	return 0;
	40
f0daaa65 YK	41	if (info->match & IP6T_OWNER_UID) {
f0daaa65 YK	42	if ((skb->sk->sk_socket->file->f_uid != info->uid) ^
1da177e4 LT	43	!!(info->invert & IP6T_OWNER_UID))
	44	return 0;
	45	}
	46
f0daaa65 YK	47	if (info->match & IP6T_OWNER_GID) {
f0daaa65 YK	48	if ((skb->sk->sk_socket->file->f_gid != info->gid) ^
1da177e4 LT	49	!!(info->invert & IP6T_OWNER_GID))
	50	return 0;
	51	}
	52
1da177e4 LT	53	return 1;
	54	}
	55
	56	static int
	57	checkentry(const char *tablename,
f0daaa65	58	const void *ip,
c4986734	59	const struct xt_match *match,
f0daaa65	60	void *matchinfo,
f0daaa65	61	unsigned int hook_mask)
1da177e4	62	{
34b4a4a6 CH	63	const struct ip6t_owner_info *info = matchinfo;
34b4a4a6 CH	64
f0daaa65	65	if (info->match & (IP6T_OWNER_PID \| IP6T_OWNER_SID)) {
34b4a4a6 CH	66	printk("ipt_owner: pid and sid matching "
34b4a4a6 CH	67	"not supported anymore\n");
1da177e4 LT	68	return 0;
1da177e4 LT	69	}
1da177e4 LT	70	return 1;
	71	}
	72
6709dbbb	73	static struct xt_match owner_match = {
1da177e4	74	.name = "owner",
6709dbbb	75	.family = AF_INET6,
7f939713 PM	76	.match = match,
	77	.matchsize = sizeof(struct ip6t_owner_info),
	78	.hooks = (1 << NF_IP6_LOCAL_OUT) \| (1 << NF_IP6_POST_ROUTING),
	79	.checkentry = checkentry,
1da177e4 LT	80	.me = THIS_MODULE,
	81	};
	82
65b4b4e8	83	static int __init ip6t_owner_init(void)
1da177e4	84	{
6709dbbb	85	return xt_register_match(&owner_match);
1da177e4 LT	86	}
1da177e4 LT	87
65b4b4e8	88	static void __exit ip6t_owner_fini(void)
1da177e4	89	{
6709dbbb	90	xt_unregister_match(&owner_match);
1da177e4 LT	91	}
1da177e4 LT	92
65b4b4e8 AM	93	module_init(ip6t_owner_init);
65b4b4e8 AM	94	module_exit(ip6t_owner_fini);