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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Kernel module to match connection tracking information. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_state.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
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MODULE_DESCRIPTION("ip[6]_tables connection tracking state match module");
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MODULE_ALIAS("ipt_state");
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MODULE_ALIAS("ip6t_state");
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static bool
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state_mt(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_state_info *sinfo = par->matchinfo;
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enum ip_conntrack_info ctinfo;
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unsigned int statebit;
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struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
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if (ct)
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statebit = XT_STATE_BIT(ctinfo);
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else if (ctinfo == IP_CT_UNTRACKED)
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statebit = XT_STATE_UNTRACKED;
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else
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statebit = XT_STATE_INVALID;
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return (sinfo->statemask & statebit);
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}
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static int state_mt_check(const struct xt_mtchk_param *par)
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{
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int ret;
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ret = nf_ct_netns_get(par->net, par->family);
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if (ret < 0)
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pr_info_ratelimited("cannot load conntrack support for proto=%u\n",
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par->family);
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return ret;
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}
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static void state_mt_destroy(const struct xt_mtdtor_param *par)
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{
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nf_ct_netns_put(par->net, par->family);
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}
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static struct xt_match state_mt_reg __read_mostly = {
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.name = "state",
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.family = NFPROTO_UNSPEC,
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.checkentry = state_mt_check,
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.match = state_mt,
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.destroy = state_mt_destroy,
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.matchsize = sizeof(struct xt_state_info),
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.me = THIS_MODULE,
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};
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static int __init state_mt_init(void)
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{
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return xt_register_match(&state_mt_reg);
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}
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static void __exit state_mt_exit(void)
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{
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xt_unregister_match(&state_mt_reg);
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}
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module_init(state_mt_init);
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module_exit(state_mt_exit);
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