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/*
* 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));
}
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