Commit | Line | Data |
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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"); | |
25 | ||
26 | static 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 | ||
35 | static 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 | ||
42 | static 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 | ||
52 | static int __init cpu_mt_init(void) | |
53 | { | |
54 | return xt_register_match(&cpu_mt_reg); | |
55 | } | |
56 | ||
57 | static void __exit cpu_mt_exit(void) | |
58 | { | |
59 | xt_unregister_match(&cpu_mt_reg); | |
60 | } | |
61 | ||
62 | module_init(cpu_mt_init); | |
63 | module_exit(cpu_mt_exit); |