projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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); |