// SPDX-License-Identifier: GPL-2.0-only
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/* Kernel module to match running CPU */
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/*
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* Might be used to distribute connections on several daemons, if
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* RPS (Remote Packet Steering) is enabled or NIC is multiqueue capable,
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* each RX queue IRQ affined to one CPU (1:1 mapping)
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*/
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/* (C) 2010 Eric Dumazet
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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 <linux/netfilter/xt_cpu.h>
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#include <linux/netfilter/x_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Eric Dumazet <eric.dumazet@gmail.com>");
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MODULE_DESCRIPTION("Xtables: CPU match");
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MODULE_ALIAS("ipt_cpu");
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MODULE_ALIAS("ip6t_cpu");
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static int cpu_mt_check(const struct xt_mtchk_param *par)
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{
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const struct xt_cpu_info *info = par->matchinfo;
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if (info->invert & ~1)
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return -EINVAL;
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return 0;
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}
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static bool cpu_mt(const struct sk_buff *skb, struct xt_action_param *par)
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{
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const struct xt_cpu_info *info = par->matchinfo;
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return (info->cpu == smp_processor_id()) ^ info->invert;
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}
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static struct xt_match cpu_mt_reg __read_mostly = {
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.name = "cpu",
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.revision = 0,
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.family = NFPROTO_UNSPEC,
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.checkentry = cpu_mt_check,
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.match = cpu_mt,
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.matchsize = sizeof(struct xt_cpu_info),
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.me = THIS_MODULE,
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};
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static int __init cpu_mt_init(void)
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{
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return xt_register_match(&cpu_mt_reg);
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}
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static void __exit cpu_mt_exit(void)
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{
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xt_unregister_match(&cpu_mt_reg);
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}
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module_init(cpu_mt_init);
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module_exit(cpu_mt_exit);
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