From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 net/netfilter/nft_queue.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 net/netfilter/nft_queue.c

(limited to 'net/netfilter/nft_queue.c')

diff --git a/net/netfilter/nft_queue.c b/net/netfilter/nft_queue.c
new file mode 100644
index 000000000..96805d21d
--- /dev/null
+++ b/net/netfilter/nft_queue.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2013 Eric Leblond <eric@regit.org>
+ *
+ * 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.
+ *
+ * Development of this code partly funded by OISF
+ * (http://www.openinfosecfoundation.org/)
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/jhash.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_queue.h>
+
+static u32 jhash_initval __read_mostly;
+
+struct nft_queue {
+	u16	queuenum;
+	u16	queues_total;
+	u16	flags;
+};
+
+static void nft_queue_eval(const struct nft_expr *expr,
+			   struct nft_regs *regs,
+			   const struct nft_pktinfo *pkt)
+{
+	struct nft_queue *priv = nft_expr_priv(expr);
+	u32 queue = priv->queuenum;
+	u32 ret;
+
+	if (priv->queues_total > 1) {
+		if (priv->flags & NFT_QUEUE_FLAG_CPU_FANOUT) {
+			int cpu = smp_processor_id();
+
+			queue = priv->queuenum + cpu % priv->queues_total;
+		} else {
+			queue = nfqueue_hash(pkt->skb, queue,
+					     priv->queues_total, pkt->ops->pf,
+					     jhash_initval);
+		}
+	}
+
+	ret = NF_QUEUE_NR(queue);
+	if (priv->flags & NFT_QUEUE_FLAG_BYPASS)
+		ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
+
+	regs->verdict.code = ret;
+}
+
+static const struct nla_policy nft_queue_policy[NFTA_QUEUE_MAX + 1] = {
+	[NFTA_QUEUE_NUM]	= { .type = NLA_U16 },
+	[NFTA_QUEUE_TOTAL]	= { .type = NLA_U16 },
+	[NFTA_QUEUE_FLAGS]	= { .type = NLA_U16 },
+};
+
+static int nft_queue_init(const struct nft_ctx *ctx,
+			   const struct nft_expr *expr,
+			   const struct nlattr * const tb[])
+{
+	struct nft_queue *priv = nft_expr_priv(expr);
+
+	if (tb[NFTA_QUEUE_NUM] == NULL)
+		return -EINVAL;
+
+	init_hashrandom(&jhash_initval);
+	priv->queuenum = ntohs(nla_get_be16(tb[NFTA_QUEUE_NUM]));
+
+	if (tb[NFTA_QUEUE_TOTAL] != NULL)
+		priv->queues_total = ntohs(nla_get_be16(tb[NFTA_QUEUE_TOTAL]));
+	if (tb[NFTA_QUEUE_FLAGS] != NULL) {
+		priv->flags = ntohs(nla_get_be16(tb[NFTA_QUEUE_FLAGS]));
+		if (priv->flags & ~NFT_QUEUE_FLAG_MASK)
+			return -EINVAL;
+	}
+	return 0;
+}
+
+static int nft_queue_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+	const struct nft_queue *priv = nft_expr_priv(expr);
+
+	if (nla_put_be16(skb, NFTA_QUEUE_NUM, htons(priv->queuenum)) ||
+	    nla_put_be16(skb, NFTA_QUEUE_TOTAL, htons(priv->queues_total)) ||
+	    nla_put_be16(skb, NFTA_QUEUE_FLAGS, htons(priv->flags)))
+		goto nla_put_failure;
+
+	return 0;
+
+nla_put_failure:
+	return -1;
+}
+
+static struct nft_expr_type nft_queue_type;
+static const struct nft_expr_ops nft_queue_ops = {
+	.type		= &nft_queue_type,
+	.size		= NFT_EXPR_SIZE(sizeof(struct nft_queue)),
+	.eval		= nft_queue_eval,
+	.init		= nft_queue_init,
+	.dump		= nft_queue_dump,
+};
+
+static struct nft_expr_type nft_queue_type __read_mostly = {
+	.name		= "queue",
+	.ops		= &nft_queue_ops,
+	.policy		= nft_queue_policy,
+	.maxattr	= NFTA_QUEUE_MAX,
+	.owner		= THIS_MODULE,
+};
+
+static int __init nft_queue_module_init(void)
+{
+	return nft_register_expr(&nft_queue_type);
+}
+
+static void __exit nft_queue_module_exit(void)
+{
+	nft_unregister_expr(&nft_queue_type);
+}
+
+module_init(nft_queue_module_init);
+module_exit(nft_queue_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Eric Leblond <eric@regit.org>");
+MODULE_ALIAS_NFT_EXPR("queue");
-- 
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