From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- net/netfilter/xt_state.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 net/netfilter/xt_state.c (limited to 'net/netfilter/xt_state.c') diff --git a/net/netfilter/xt_state.c b/net/netfilter/xt_state.c new file mode 100644 index 000000000..a507922d8 --- /dev/null +++ b/net/netfilter/xt_state.c @@ -0,0 +1,79 @@ +/* Kernel module to match connection tracking information. */ + +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2005 Netfilter Core Team + * + * 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 +#include +#include +#include +#include + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Rusty Russell "); +MODULE_DESCRIPTION("ip[6]_tables connection tracking state match module"); +MODULE_ALIAS("ipt_state"); +MODULE_ALIAS("ip6t_state"); + +static bool +state_mt(const struct sk_buff *skb, struct xt_action_param *par) +{ + const struct xt_state_info *sinfo = par->matchinfo; + enum ip_conntrack_info ctinfo; + unsigned int statebit; + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); + + if (!ct) + statebit = XT_STATE_INVALID; + else { + if (nf_ct_is_untracked(ct)) + statebit = XT_STATE_UNTRACKED; + else + statebit = XT_STATE_BIT(ctinfo); + } + return (sinfo->statemask & statebit); +} + +static int state_mt_check(const struct xt_mtchk_param *par) +{ + int ret; + + ret = nf_ct_l3proto_try_module_get(par->family); + if (ret < 0) + pr_info("cannot load conntrack support for proto=%u\n", + par->family); + return ret; +} + +static void state_mt_destroy(const struct xt_mtdtor_param *par) +{ + nf_ct_l3proto_module_put(par->family); +} + +static struct xt_match state_mt_reg __read_mostly = { + .name = "state", + .family = NFPROTO_UNSPEC, + .checkentry = state_mt_check, + .match = state_mt, + .destroy = state_mt_destroy, + .matchsize = sizeof(struct xt_state_info), + .me = THIS_MODULE, +}; + +static int __init state_mt_init(void) +{ + return xt_register_match(&state_mt_reg); +} + +static void __exit state_mt_exit(void) +{ + xt_unregister_match(&state_mt_reg); +} + +module_init(state_mt_init); +module_exit(state_mt_exit); -- cgit v1.2.3