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