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Linux/net/netfilter/xt_cpu.c

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  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 
 22 MODULE_LICENSE("GPL");
 23 MODULE_AUTHOR("Eric Dumazet <eric.dumazet@gmail.com>");
 24 MODULE_DESCRIPTION("Xtables: CPU match");
 25 MODULE_ALIAS("ipt_cpu");
 26 MODULE_ALIAS("ip6t_cpu");
 27 
 28 static int cpu_mt_check(const struct xt_mtchk_param *par)
 29 {
 30         const struct xt_cpu_info *info = par->matchinfo;
 31 
 32         if (info->invert & ~1)
 33                 return -EINVAL;
 34         return 0;
 35 }
 36 
 37 static bool cpu_mt(const struct sk_buff *skb, struct xt_action_param *par)
 38 {
 39         const struct xt_cpu_info *info = par->matchinfo;
 40 
 41         return (info->cpu == smp_processor_id()) ^ info->invert;
 42 }
 43 
 44 static struct xt_match cpu_mt_reg __read_mostly = {
 45         .name       = "cpu",
 46         .revision   = 0,
 47         .family     = NFPROTO_UNSPEC,
 48         .checkentry = cpu_mt_check,
 49         .match      = cpu_mt,
 50         .matchsize  = sizeof(struct xt_cpu_info),
 51         .me         = THIS_MODULE,
 52 };
 53 
 54 static int __init cpu_mt_init(void)
 55 {
 56         return xt_register_match(&cpu_mt_reg);
 57 }
 58 
 59 static void __exit cpu_mt_exit(void)
 60 {
 61         xt_unregister_match(&cpu_mt_reg);
 62 }
 63 
 64 module_init(cpu_mt_init);
 65 module_exit(cpu_mt_exit);
 66 

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