]>
Commit | Line | Data |
---|---|---|
e8648a1f ED |
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"); | |
f1e231a3 JE |
25 | MODULE_ALIAS("ipt_cpu"); |
26 | MODULE_ALIAS("ip6t_cpu"); | |
e8648a1f ED |
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); |