/*

 * Shared library add-on to iptables to add early socket matching support.

 *

 * Copyright (C) 2007 BalaBit IT Ltd.

 */

#include <stdio.h>

#include <xtables.h>

#include <linux/netfilter/xt_socket.h>

enum {

	O_TRANSPARENT = 0,

	O_NOWILDCARD = 1,

	O_RESTORESKMARK = 2,

};

static const struct xt_option_entry socket_mt_opts[] = {

	{.name = "transparent", .id = O_TRANSPARENT, .type = XTTYPE_NONE},

	XTOPT_TABLEEND,

};

static const struct xt_option_entry socket_mt_opts_v2[] = {

	{.name = "transparent", .id = O_TRANSPARENT, .type = XTTYPE_NONE},

	{.name = "nowildcard", .id = O_NOWILDCARD, .type = XTTYPE_NONE},

	XTOPT_TABLEEND,

};

static const struct xt_option_entry socket_mt_opts_v3[] = {

	{.name = "transparent", .id = O_TRANSPARENT, .type = XTTYPE_NONE},

	{.name = "nowildcard", .id = O_NOWILDCARD, .type = XTTYPE_NONE},

	{.name = "restore-skmark", .id = O_RESTORESKMARK, .type = XTTYPE_NONE},

	XTOPT_TABLEEND,

};

static void socket_mt_help(void)

{

	printf(

		"socket match options:\n"

		"  --transparent    Ignore non-transparent sockets\n\n");

}

static void socket_mt_help_v2(void)

{

	printf(

		"socket match options:\n"

		"  --nowildcard     Do not ignore LISTEN sockets bound on INADDR_ANY\n"

		"  --transparent    Ignore non-transparent sockets\n\n");

}

static void socket_mt_help_v3(void)

{

	printf(

		"socket match options:\n"

		"  --nowildcard     Do not ignore LISTEN sockets bound on INADDR_ANY\n"

		"  --transparent    Ignore non-transparent sockets\n"

		"  --restore-skmark Set the packet mark to the socket mark if\n"

		"                   the socket matches and transparent / \n"

		"                   nowildcard conditions are satisfied\n\n");

}

static void socket_mt_parse(struct xt_option_call *cb)

{

	struct xt_socket_mtinfo1 *info = cb->data;

	xtables_option_parse(cb);

	switch (cb->entry->id) {

	case O_TRANSPARENT:

		info->flags |= XT_SOCKET_TRANSPARENT;

		break;

	}

}

static void socket_mt_parse_v2(struct xt_option_call *cb)

{

	struct xt_socket_mtinfo2 *info = cb->data;

	xtables_option_parse(cb);

	switch (cb->entry->id) {

	case O_TRANSPARENT:

		info->flags |= XT_SOCKET_TRANSPARENT;

		break;

	case O_NOWILDCARD:

		info->flags |= XT_SOCKET_NOWILDCARD;

		break;

	}

}

static void socket_mt_parse_v3(struct xt_option_call *cb)

{

	struct xt_socket_mtinfo2 *info = cb->data;

	xtables_option_parse(cb);

	switch (cb->entry->id) {

	case O_TRANSPARENT:

		info->flags |= XT_SOCKET_TRANSPARENT;

		break;

	case O_NOWILDCARD:

		info->flags |= XT_SOCKET_NOWILDCARD;

		break;

	case O_RESTORESKMARK:

		info->flags |= XT_SOCKET_RESTORESKMARK;

		break;

	}

}

static void

socket_mt_save(const void *ip, const struct xt_entry_match *match)

{

	const struct xt_socket_mtinfo1 *info = (const void *)match->data;

	if (info->flags & XT_SOCKET_TRANSPARENT)

		printf(" --transparent");

}

static void

socket_mt_print(const void *ip, const struct xt_entry_match *match,

		int numeric)

{

	printf(" socket");

	socket_mt_save(ip, match);

}

static void

socket_mt_save_v2(const void *ip, const struct xt_entry_match *match)

{

	const struct xt_socket_mtinfo2 *info = (const void *)match->data;

	if (info->flags & XT_SOCKET_TRANSPARENT)

		printf(" --transparent");

	if (info->flags & XT_SOCKET_NOWILDCARD)

		printf(" --nowildcard");

}

static void

socket_mt_print_v2(const void *ip, const struct xt_entry_match *match,

		   int numeric)

{

	printf(" socket");

	socket_mt_save_v2(ip, match);

}

static void

socket_mt_save_v3(const void *ip, const struct xt_entry_match *match)

{

	const struct xt_socket_mtinfo3 *info = (const void *)match->data;

	if (info->flags & XT_SOCKET_TRANSPARENT)

		printf(" --transparent");

	if (info->flags & XT_SOCKET_NOWILDCARD)

		printf(" --nowildcard");

	if (info->flags & XT_SOCKET_RESTORESKMARK)

		printf(" --restore-skmark");

}

static void

socket_mt_print_v3(const void *ip, const struct xt_entry_match *match,

		   int numeric)

{

	printf(" socket");

	socket_mt_save_v3(ip, match);

}

static struct xtables_match socket_mt_reg[] = {

	{

		.name          = "socket",

		.revision      = 0,

		.family        = NFPROTO_IPV4,

		.version       = XTABLES_VERSION,

		.size          = XT_ALIGN(0),

		.userspacesize = XT_ALIGN(0),

	},

	{

		.name          = "socket",

		.revision      = 1,

		.family        = NFPROTO_UNSPEC,

		.version       = XTABLES_VERSION,

		.size          = XT_ALIGN(sizeof(struct xt_socket_mtinfo1)),

		.userspacesize = XT_ALIGN(sizeof(struct xt_socket_mtinfo1)),

		.help          = socket_mt_help,

		.print         = socket_mt_print,

		.save          = socket_mt_save,

		.x6_parse      = socket_mt_parse,

		.x6_options    = socket_mt_opts,

	},

	{

		.name          = "socket",

		.revision      = 2,

		.family        = NFPROTO_UNSPEC,

		.version       = XTABLES_VERSION,

		.size          = XT_ALIGN(sizeof(struct xt_socket_mtinfo2)),

		.userspacesize = XT_ALIGN(sizeof(struct xt_socket_mtinfo2)),

		.help          = socket_mt_help_v2,

		.print         = socket_mt_print_v2,

		.save          = socket_mt_save_v2,

		.x6_parse      = socket_mt_parse_v2,

		.x6_options    = socket_mt_opts_v2,

	},

	{

		.name          = "socket",

		.revision      = 3,

		.family        = NFPROTO_UNSPEC,

		.version       = XTABLES_VERSION,

		.size          = XT_ALIGN(sizeof(struct xt_socket_mtinfo2)),

		.userspacesize = XT_ALIGN(sizeof(struct xt_socket_mtinfo2)),

		.help          = socket_mt_help_v3,

		.print         = socket_mt_print_v3,

		.save          = socket_mt_save_v3,

		.x6_parse      = socket_mt_parse_v3,

		.x6_options    = socket_mt_opts_v3,

	},

};

void _init(void)

{

	xtables_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));

}