Eric Dumazet | e8648a1 | 2010-07-23 12:59:36 +0200 | [diff] [blame] | 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"); |
Jan Engelhardt | f1e231a | 2011-01-18 06:30:13 +0100 | [diff] [blame] | 25 | MODULE_ALIAS("ipt_cpu"); |
| 26 | MODULE_ALIAS("ip6t_cpu"); |
Eric Dumazet | e8648a1 | 2010-07-23 12:59:36 +0200 | [diff] [blame] | 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); |