1/* Kernel module to match running CPU */ 2 3/* 4 * Might be used to distribute connections on several daemons, if 5 * RPS (Remote Packet Steering) is enabled or NIC is multiqueue capable, 6 * each RX queue IRQ affined to one CPU (1:1 mapping) 7 * 8 */ 9 10/* (C) 2010 Eric Dumazet 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 17#include <linux/module.h> 18#include <linux/skbuff.h> 19#include <linux/netfilter/xt_cpu.h> 20#include <linux/netfilter/x_tables.h> 21 22MODULE_LICENSE("GPL"); 23MODULE_AUTHOR("Eric Dumazet <eric.dumazet@gmail.com>"); 24MODULE_DESCRIPTION("Xtables: CPU match"); 25 26static int cpu_mt_check(const struct xt_mtchk_param *par) 27{ 28 const struct xt_cpu_info *info = par->matchinfo; 29 30 if (info->invert & ~1) 31 return -EINVAL; 32 return 0; 33} 34 35static bool cpu_mt(const struct sk_buff *skb, struct xt_action_param *par) 36{ 37 const struct xt_cpu_info *info = par->matchinfo; 38 39 return (info->cpu == smp_processor_id()) ^ info->invert; 40} 41 42static struct xt_match cpu_mt_reg __read_mostly = { 43 .name = "cpu", 44 .revision = 0, 45 .family = NFPROTO_UNSPEC, 46 .checkentry = cpu_mt_check, 47 .match = cpu_mt, 48 .matchsize = sizeof(struct xt_cpu_info), 49 .me = THIS_MODULE, 50}; 51 52static int __init cpu_mt_init(void) 53{ 54 return xt_register_match(&cpu_mt_reg); 55} 56 57static void __exit cpu_mt_exit(void) 58{ 59 xt_unregister_match(&cpu_mt_reg); 60} 61 62module_init(cpu_mt_init); 63module_exit(cpu_mt_exit); 64