blob: c7a2e5466bc47013887a40684b19e189edc5e994 [file] [log] [blame]
Eric Dumazete8648a12010-07-23 12:59:36 +02001/* 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");
Jan Engelhardtf1e231a2011-01-18 06:30:13 +010025MODULE_ALIAS("ipt_cpu");
26MODULE_ALIAS("ip6t_cpu");
Eric Dumazete8648a12010-07-23 12:59:36 +020027
28static 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
37static 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
44static 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
54static int __init cpu_mt_init(void)
55{
56 return xt_register_match(&cpu_mt_reg);
57}
58
59static void __exit cpu_mt_exit(void)
60{
61 xt_unregister_match(&cpu_mt_reg);
62}
63
64module_init(cpu_mt_init);
65module_exit(cpu_mt_exit);