From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 20:49:45 +0200
Subject: Adding upstream version 6.1.76.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 net/netfilter/xt_NFQUEUE.c | 158 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 net/netfilter/xt_NFQUEUE.c

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

diff --git a/net/netfilter/xt_NFQUEUE.c b/net/netfilter/xt_NFQUEUE.c
new file mode 100644
index 000000000..466da23e3
--- /dev/null
+++ b/net/netfilter/xt_NFQUEUE.c
@@ -0,0 +1,158 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* iptables module for using new netfilter netlink queue
+ *
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_arp.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_NFQUEUE.h>
+
+#include <net/netfilter/nf_queue.h>
+
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: packet forwarding to netlink");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ipt_NFQUEUE");
+MODULE_ALIAS("ip6t_NFQUEUE");
+MODULE_ALIAS("arpt_NFQUEUE");
+
+static u32 jhash_initval __read_mostly;
+
+static unsigned int
+nfqueue_tg(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_NFQ_info *tinfo = par->targinfo;
+
+	return NF_QUEUE_NR(tinfo->queuenum);
+}
+
+static unsigned int
+nfqueue_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_NFQ_info_v1 *info = par->targinfo;
+	u32 queue = info->queuenum;
+
+	if (info->queues_total > 1) {
+		queue = nfqueue_hash(skb, queue, info->queues_total,
+				     xt_family(par), jhash_initval);
+	}
+	return NF_QUEUE_NR(queue);
+}
+
+static unsigned int
+nfqueue_tg_v2(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_NFQ_info_v2 *info = par->targinfo;
+	unsigned int ret = nfqueue_tg_v1(skb, par);
+
+	if (info->bypass)
+		ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
+	return ret;
+}
+
+static int nfqueue_tg_check(const struct xt_tgchk_param *par)
+{
+	const struct xt_NFQ_info_v3 *info = par->targinfo;
+	u32 maxid;
+
+	init_hashrandom(&jhash_initval);
+
+	if (info->queues_total == 0) {
+		pr_info_ratelimited("number of total queues is 0\n");
+		return -EINVAL;
+	}
+	maxid = info->queues_total - 1 + info->queuenum;
+	if (maxid > 0xffff) {
+		pr_info_ratelimited("number of queues (%u) out of range (got %u)\n",
+				    info->queues_total, maxid);
+		return -ERANGE;
+	}
+	if (par->target->revision == 2 && info->flags > 1)
+		return -EINVAL;
+	if (par->target->revision == 3 && info->flags & ~NFQ_FLAG_MASK)
+		return -EINVAL;
+
+	return 0;
+}
+
+static unsigned int
+nfqueue_tg_v3(struct sk_buff *skb, const struct xt_action_param *par)
+{
+	const struct xt_NFQ_info_v3 *info = par->targinfo;
+	u32 queue = info->queuenum;
+	int ret;
+
+	if (info->queues_total > 1) {
+		if (info->flags & NFQ_FLAG_CPU_FANOUT) {
+			int cpu = smp_processor_id();
+
+			queue = info->queuenum + cpu % info->queues_total;
+		} else {
+			queue = nfqueue_hash(skb, queue, info->queues_total,
+					     xt_family(par), jhash_initval);
+		}
+	}
+
+	ret = NF_QUEUE_NR(queue);
+	if (info->flags & NFQ_FLAG_BYPASS)
+		ret |= NF_VERDICT_FLAG_QUEUE_BYPASS;
+
+	return ret;
+}
+
+static struct xt_target nfqueue_tg_reg[] __read_mostly = {
+	{
+		.name		= "NFQUEUE",
+		.family		= NFPROTO_UNSPEC,
+		.target		= nfqueue_tg,
+		.targetsize	= sizeof(struct xt_NFQ_info),
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "NFQUEUE",
+		.revision	= 1,
+		.family		= NFPROTO_UNSPEC,
+		.checkentry	= nfqueue_tg_check,
+		.target		= nfqueue_tg_v1,
+		.targetsize	= sizeof(struct xt_NFQ_info_v1),
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "NFQUEUE",
+		.revision	= 2,
+		.family		= NFPROTO_UNSPEC,
+		.checkentry	= nfqueue_tg_check,
+		.target		= nfqueue_tg_v2,
+		.targetsize	= sizeof(struct xt_NFQ_info_v2),
+		.me		= THIS_MODULE,
+	},
+	{
+		.name		= "NFQUEUE",
+		.revision	= 3,
+		.family		= NFPROTO_UNSPEC,
+		.checkentry	= nfqueue_tg_check,
+		.target		= nfqueue_tg_v3,
+		.targetsize	= sizeof(struct xt_NFQ_info_v3),
+		.me		= THIS_MODULE,
+	},
+};
+
+static int __init nfqueue_tg_init(void)
+{
+	return xt_register_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
+}
+
+static void __exit nfqueue_tg_exit(void)
+{
+	xt_unregister_targets(nfqueue_tg_reg, ARRAY_SIZE(nfqueue_tg_reg));
+}
+
+module_init(nfqueue_tg_init);
+module_exit(nfqueue_tg_exit);
-- 
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