From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Mon, 6 May 2024 03:02:30 +0200
Subject: Adding upstream version 4.19.249.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 net/rose/rose_dev.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 net/rose/rose_dev.c

(limited to 'net/rose/rose_dev.c')

diff --git a/net/rose/rose_dev.c b/net/rose/rose_dev.c
new file mode 100644
index 000000000..369ca81a8
--- /dev/null
+++ b/net/rose/rose_dev.c
@@ -0,0 +1,144 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ */
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/sysctl.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/errno.h>
+#include <linux/fcntl.h>
+#include <linux/in.h>
+#include <linux/if_ether.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+
+#include <net/ip.h>
+#include <net/arp.h>
+
+#include <net/ax25.h>
+#include <net/rose.h>
+
+static int rose_header(struct sk_buff *skb, struct net_device *dev,
+		       unsigned short type,
+		       const void *daddr, const void *saddr, unsigned int len)
+{
+	unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
+
+	if (daddr)
+		memcpy(buff + 7, daddr, dev->addr_len);
+
+	*buff++ = ROSE_GFI | ROSE_Q_BIT;
+	*buff++ = 0x00;
+	*buff++ = ROSE_DATA;
+	*buff++ = 0x7F;
+	*buff++ = AX25_P_IP;
+
+	if (daddr != NULL)
+		return 37;
+
+	return -37;
+}
+
+static int rose_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct sockaddr *sa = addr;
+	int err;
+
+	if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
+		return 0;
+
+	if (dev->flags & IFF_UP) {
+		err = rose_add_loopback_node((rose_address *)sa->sa_data);
+		if (err)
+			return err;
+
+		rose_del_loopback_node((rose_address *)dev->dev_addr);
+	}
+
+	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+
+	return 0;
+}
+
+static int rose_open(struct net_device *dev)
+{
+	int err;
+
+	err = rose_add_loopback_node((rose_address *)dev->dev_addr);
+	if (err)
+		return err;
+
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+static int rose_close(struct net_device *dev)
+{
+	netif_stop_queue(dev);
+	rose_del_loopback_node((rose_address *)dev->dev_addr);
+	return 0;
+}
+
+static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct net_device_stats *stats = &dev->stats;
+	unsigned int len = skb->len;
+
+	if (!netif_running(dev)) {
+		printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
+		return NETDEV_TX_BUSY;
+	}
+
+	if (!rose_route_frame(skb, NULL)) {
+		dev_kfree_skb(skb);
+		stats->tx_errors++;
+		return NETDEV_TX_OK;
+	}
+
+	stats->tx_packets++;
+	stats->tx_bytes += len;
+	return NETDEV_TX_OK;
+}
+
+static const struct header_ops rose_header_ops = {
+	.create	= rose_header,
+};
+
+static const struct net_device_ops rose_netdev_ops = {
+	.ndo_open		= rose_open,
+	.ndo_stop		= rose_close,
+	.ndo_start_xmit		= rose_xmit,
+	.ndo_set_mac_address    = rose_set_mac_address,
+};
+
+void rose_setup(struct net_device *dev)
+{
+	dev->mtu		= ROSE_MAX_PACKET_SIZE - 2;
+	dev->netdev_ops		= &rose_netdev_ops;
+
+	dev->header_ops		= &rose_header_ops;
+	dev->hard_header_len	= AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
+	dev->addr_len		= ROSE_ADDR_LEN;
+	dev->type		= ARPHRD_ROSE;
+
+	/* New-style flags. */
+	dev->flags		= IFF_NOARP;
+}
-- 
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