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