Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_cpu.c

diff --git a/kernel/net/netfilter/xt_cpu.c b/kernel/net/netfilter/xt_cpu.c
new file mode 100644 (file)
index 0000000..c7a2e54
--- /dev/null
+++ b/kernel/net/netfilter/xt_cpu.c
@@ -0,0 +1,65 @@
+/* Kernel module to match running CPU */
+
+/*
+ * Might be used to distribute connections on several daemons, if
+ * RPS (Remote Packet Steering) is enabled or NIC is multiqueue capable,
+ * each RX queue IRQ affined to one CPU (1:1 mapping)
+ *
+ */
+
+/* (C) 2010 Eric Dumazet
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter/xt_cpu.h>
+#include <linux/netfilter/x_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Eric Dumazet <eric.dumazet@gmail.com>");
+MODULE_DESCRIPTION("Xtables: CPU match");
+MODULE_ALIAS("ipt_cpu");
+MODULE_ALIAS("ip6t_cpu");
+
+static int cpu_mt_check(const struct xt_mtchk_param *par)
+{
+       const struct xt_cpu_info *info = par->matchinfo;
+
+       if (info->invert & ~1)
+               return -EINVAL;
+       return 0;
+}
+
+static bool cpu_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+       const struct xt_cpu_info *info = par->matchinfo;
+
+       return (info->cpu == smp_processor_id()) ^ info->invert;
+}
+
+static struct xt_match cpu_mt_reg __read_mostly = {
+       .name       = "cpu",
+       .revision   = 0,
+       .family     = NFPROTO_UNSPEC,
+       .checkentry = cpu_mt_check,
+       .match      = cpu_mt,
+       .matchsize  = sizeof(struct xt_cpu_info),
+       .me         = THIS_MODULE,
+};
+
+static int __init cpu_mt_init(void)
+{
+       return xt_register_match(&cpu_mt_reg);
+}
+
+static void __exit cpu_mt_exit(void)
+{
+       xt_unregister_match(&cpu_mt_reg);
+}
+
+module_init(cpu_mt_init);
+module_exit(cpu_mt_exit);