83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
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* Shared library add-on to iptables to add early socket matching support.
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*
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* Copyright (C) 2007 BalaBit IT Ltd.
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*/
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#include <stdio.h>
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#include <xtables.h>
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#include <linux/netfilter/xt_socket.h>
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enum {
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O_TRANSPARENT = 0,
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};
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static const struct xt_option_entry socket_mt_opts[] = {
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{.name = "transparent", .id = O_TRANSPARENT, .type = XTTYPE_NONE},
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XTOPT_TABLEEND,
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};
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static void socket_mt_help(void)
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{
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printf(
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"socket match options:\n"
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" --transparent Ignore non-transparent sockets\n\n");
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}
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static void socket_mt_parse(struct xt_option_call *cb)
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{
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struct xt_socket_mtinfo1 *info = cb->data;
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xtables_option_parse(cb);
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switch (cb->entry->id) {
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case O_TRANSPARENT:
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info->flags |= XT_SOCKET_TRANSPARENT;
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break;
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}
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}
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static void
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socket_mt_save(const void *ip, const struct xt_entry_match *match)
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{
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const struct xt_socket_mtinfo1 *info = (const void *)match->data;
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if (info->flags & XT_SOCKET_TRANSPARENT)
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printf(" --transparent");
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}
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static void
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socket_mt_print(const void *ip, const struct xt_entry_match *match,
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int numeric)
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{
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printf(" socket");
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socket_mt_save(ip, match);
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}
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static struct xtables_match socket_mt_reg[] = {
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{
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.name = "socket",
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.revision = 0,
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.family = NFPROTO_IPV4,
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.version = XTABLES_VERSION,
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.size = XT_ALIGN(0),
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.userspacesize = XT_ALIGN(0),
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},
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{
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.name = "socket",
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.revision = 1,
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.family = NFPROTO_UNSPEC,
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.version = XTABLES_VERSION,
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.size = XT_ALIGN(sizeof(struct xt_socket_mtinfo1)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_socket_mtinfo1)),
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.help = socket_mt_help,
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.print = socket_mt_print,
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.save = socket_mt_save,
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.x6_parse = socket_mt_parse,
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.x6_options = socket_mt_opts,
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},
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};
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void _init(void)
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{
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xtables_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
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}
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