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![Eric Dumazet](/assets/img/avatar_default.png)
NOTRACK makes all cpus share a cache line on nf_conntrack_untracked twice per packet. This is bad for performance. __read_mostly annotation is also a bad choice. This patch introduces IPS_UNTRACKED bit so that we can use later a per_cpu untrack structure more easily. A new helper, nf_ct_untracked_get() returns a pointer to nf_conntrack_untracked. Another one, nf_ct_untracked_status_or() is used by nf_nat_init() to add IPS_NAT_DONE_MASK bits to untracked status. nf_ct_is_untracked() prototype is changed to work on a nf_conn pointer. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
79 lines
2 KiB
C
79 lines
2 KiB
C
/* 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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_INVALID;
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else {
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if (nf_ct_is_untracked(ct))
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statebit = XT_STATE_UNTRACKED;
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else
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statebit = XT_STATE_BIT(ctinfo);
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}
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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_l3proto_try_module_get(par->family);
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if (ret < 0)
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pr_info("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_l3proto_module_put(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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