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>
---
 drivers/net/wan/hdlc_raw_eth.c | 132 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 drivers/net/wan/hdlc_raw_eth.c

(limited to 'drivers/net/wan/hdlc_raw_eth.c')

diff --git a/drivers/net/wan/hdlc_raw_eth.c b/drivers/net/wan/hdlc_raw_eth.c
new file mode 100644
index 000000000..0a66b7356
--- /dev/null
+++ b/drivers/net/wan/hdlc_raw_eth.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic HDLC support routines for Linux
+ * HDLC Ethernet emulation support
+ *
+ * Copyright (C) 2002-2006 Krzysztof Halasa <khc@pm.waw.pl>
+ */
+
+#include <linux/errno.h>
+#include <linux/etherdevice.h>
+#include <linux/gfp.h>
+#include <linux/hdlc.h>
+#include <linux/if_arp.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pkt_sched.h>
+#include <linux/poll.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+
+static int raw_eth_ioctl(struct net_device *dev, struct if_settings *ifs);
+
+static netdev_tx_t eth_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	int pad = ETH_ZLEN - skb->len;
+	if (pad > 0) {		/* Pad the frame with zeros */
+		int len = skb->len;
+		if (skb_tailroom(skb) < pad)
+			if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
+				dev->stats.tx_dropped++;
+				dev_kfree_skb(skb);
+				return 0;
+			}
+		skb_put(skb, pad);
+		memset(skb->data + len, 0, pad);
+	}
+	return dev_to_hdlc(dev)->xmit(skb, dev);
+}
+
+
+static struct hdlc_proto proto = {
+	.type_trans	= eth_type_trans,
+	.xmit		= eth_tx,
+	.ioctl		= raw_eth_ioctl,
+	.module		= THIS_MODULE,
+};
+
+
+static int raw_eth_ioctl(struct net_device *dev, struct if_settings *ifs)
+{
+	raw_hdlc_proto __user *raw_s = ifs->ifs_ifsu.raw_hdlc;
+	const size_t size = sizeof(raw_hdlc_proto);
+	raw_hdlc_proto new_settings;
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	unsigned int old_qlen;
+	int result;
+
+	switch (ifs->type) {
+	case IF_GET_PROTO:
+		if (dev_to_hdlc(dev)->proto != &proto)
+			return -EINVAL;
+		ifs->type = IF_PROTO_HDLC_ETH;
+		if (ifs->size < size) {
+			ifs->size = size; /* data size wanted */
+			return -ENOBUFS;
+		}
+		if (copy_to_user(raw_s, hdlc->state, size))
+			return -EFAULT;
+		return 0;
+
+	case IF_PROTO_HDLC_ETH:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (dev->flags & IFF_UP)
+			return -EBUSY;
+
+		if (copy_from_user(&new_settings, raw_s, size))
+			return -EFAULT;
+
+		if (new_settings.encoding == ENCODING_DEFAULT)
+			new_settings.encoding = ENCODING_NRZ;
+
+		if (new_settings.parity == PARITY_DEFAULT)
+			new_settings.parity = PARITY_CRC16_PR1_CCITT;
+
+		result = hdlc->attach(dev, new_settings.encoding,
+				      new_settings.parity);
+		if (result)
+			return result;
+
+		result = attach_hdlc_protocol(dev, &proto,
+					      sizeof(raw_hdlc_proto));
+		if (result)
+			return result;
+		memcpy(hdlc->state, &new_settings, size);
+		old_qlen = dev->tx_queue_len;
+		ether_setup(dev);
+		dev->tx_queue_len = old_qlen;
+		dev->priv_flags &= ~IFF_TX_SKB_SHARING;
+		eth_hw_addr_random(dev);
+		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
+		netif_dormant_off(dev);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+
+static int __init hdlc_eth_init(void)
+{
+	register_hdlc_protocol(&proto);
+	return 0;
+}
+
+
+
+static void __exit hdlc_eth_exit(void)
+{
+	unregister_hdlc_protocol(&proto);
+}
+
+
+module_init(hdlc_eth_init);
+module_exit(hdlc_eth_exit);
+
+MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
+MODULE_DESCRIPTION("Ethernet encapsulation support for generic HDLC");
+MODULE_LICENSE("GPL v2");
-- 
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