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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e8648a1f ED |
2 | /* Kernel module to match running CPU */ |
3 | ||
4 | /* | |
5 | * Might be used to distribute connections on several daemons, if | |
6 | * RPS (Remote Packet Steering) is enabled or NIC is multiqueue capable, | |
7 | * each RX queue IRQ affined to one CPU (1:1 mapping) | |
e8648a1f ED |
8 | */ |
9 | ||
10 | /* (C) 2010 Eric Dumazet | |
e8648a1f ED |
11 | */ |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/netfilter/xt_cpu.h> | |
16 | #include <linux/netfilter/x_tables.h> | |
17 | ||
18 | MODULE_LICENSE("GPL"); | |
19 | MODULE_AUTHOR("Eric Dumazet <eric.dumazet@gmail.com>"); | |
20 | MODULE_DESCRIPTION("Xtables: CPU match"); | |
f1e231a3 JE |
21 | MODULE_ALIAS("ipt_cpu"); |
22 | MODULE_ALIAS("ip6t_cpu"); | |
e8648a1f ED |
23 | |
24 | static int cpu_mt_check(const struct xt_mtchk_param *par) | |
25 | { | |
26 | const struct xt_cpu_info *info = par->matchinfo; | |
27 | ||
28 | if (info->invert & ~1) | |
29 | return -EINVAL; | |
30 | return 0; | |
31 | } | |
32 | ||
33 | static bool cpu_mt(const struct sk_buff *skb, struct xt_action_param *par) | |
34 | { | |
35 | const struct xt_cpu_info *info = par->matchinfo; | |
36 | ||
37 | return (info->cpu == smp_processor_id()) ^ info->invert; | |
38 | } | |
39 | ||
40 | static struct xt_match cpu_mt_reg __read_mostly = { | |
41 | .name = "cpu", | |
42 | .revision = 0, | |
43 | .family = NFPROTO_UNSPEC, | |
44 | .checkentry = cpu_mt_check, | |
45 | .match = cpu_mt, | |
46 | .matchsize = sizeof(struct xt_cpu_info), | |
47 | .me = THIS_MODULE, | |
48 | }; | |
49 | ||
50 | static int __init cpu_mt_init(void) | |
51 | { | |
52 | return xt_register_match(&cpu_mt_reg); | |
53 | } | |
54 | ||
55 | static void __exit cpu_mt_exit(void) | |
56 | { | |
57 | xt_unregister_match(&cpu_mt_reg); | |
58 | } | |
59 | ||
60 | module_init(cpu_mt_init); | |
61 | module_exit(cpu_mt_exit); |