Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 244 insertions, 0 deletions

diff --git a/drivers/net/wan/hdlc_x25.c b/drivers/net/wan/hdlc_x25.c
new file mode 100644
index 000000000..e86763806
--- /dev/null
+++ b/drivers/net/wan/hdlc_x25.c
@@ -0,0 +1,244 @@
+/*
+ * Generic HDLC support routines for Linux
+ * X.25 support
+ *
+ * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/errno.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/lapb.h>
+#include <linux/module.h>
+#include <linux/pkt_sched.h>
+#include <linux/poll.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <net/x25device.h>
+
+static int x25_ioctl(struct net_device *dev, struct ifreq *ifr);
+
+/* These functions are callbacks called by LAPB layer */
+
+static void x25_connect_disconnect(struct net_device *dev, int reason, int code)
+{
+	struct sk_buff *skb;
+	unsigned char *ptr;
+
+	if ((skb = dev_alloc_skb(1)) == NULL) {
+		netdev_err(dev, "out of memory\n");
+		return;
+	}
+
+	ptr = skb_put(skb, 1);
+	*ptr = code;
+
+	skb->protocol = x25_type_trans(skb, dev);
+	netif_rx(skb);
+}
+
+
+
+static void x25_connected(struct net_device *dev, int reason)
+{
+	x25_connect_disconnect(dev, reason, X25_IFACE_CONNECT);
+}
+
+
+
+static void x25_disconnected(struct net_device *dev, int reason)
+{
+	x25_connect_disconnect(dev, reason, X25_IFACE_DISCONNECT);
+}
+
+
+
+static int x25_data_indication(struct net_device *dev, struct sk_buff *skb)
+{
+	unsigned char *ptr;
+
+	skb_push(skb, 1);
+
+	if (skb_cow(skb, 1))
+		return NET_RX_DROP;
+
+	ptr  = skb->data;
+	*ptr = X25_IFACE_DATA;
+
+	skb->protocol = x25_type_trans(skb, dev);
+	return netif_rx(skb);
+}
+
+
+
+static void x25_data_transmit(struct net_device *dev, struct sk_buff *skb)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	hdlc->xmit(skb, dev); /* Ignore return value :-( */
+}
+
+
+
+static netdev_tx_t x25_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	int result;
+
+
+	/* X.25 to LAPB */
+	switch (skb->data[0]) {
+	case X25_IFACE_DATA:	/* Data to be transmitted */
+		skb_pull(skb, 1);
+		if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
+			dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
+
+	case X25_IFACE_CONNECT:
+		if ((result = lapb_connect_request(dev))!= LAPB_OK) {
+			if (result == LAPB_CONNECTED)
+				/* Send connect confirm. msg to level 3 */
+				x25_connected(dev, 0);
+			else
+				netdev_err(dev, "LAPB connect request failed, error code = %i\n",
+					   result);
+		}
+		break;
+
+	case X25_IFACE_DISCONNECT:
+		if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
+			if (result == LAPB_NOTCONNECTED)
+				/* Send disconnect confirm. msg to level 3 */
+				x25_disconnected(dev, 0);
+			else
+				netdev_err(dev, "LAPB disconnect request failed, error code = %i\n",
+					   result);
+		}
+		break;
+
+	default:		/* to be defined */
+		break;
+	}
+
+	dev_kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+
+
+static int x25_open(struct net_device *dev)
+{
+	int result;
+	static const struct lapb_register_struct cb = {
+		.connect_confirmation = x25_connected,
+		.connect_indication = x25_connected,
+		.disconnect_confirmation = x25_disconnected,
+		.disconnect_indication = x25_disconnected,
+		.data_indication = x25_data_indication,
+		.data_transmit = x25_data_transmit,
+	};
+
+	result = lapb_register(dev, &cb);
+	if (result != LAPB_OK)
+		return result;
+	return 0;
+}
+
+
+
+static void x25_close(struct net_device *dev)
+{
+	lapb_unregister(dev);
+}
+
+
+
+static int x25_rx(struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+
+	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
+		dev->stats.rx_dropped++;
+		return NET_RX_DROP;
+	}
+
+	if (lapb_data_received(dev, skb) == LAPB_OK)
+		return NET_RX_SUCCESS;
+
+	dev->stats.rx_errors++;
+	dev_kfree_skb_any(skb);
+	return NET_RX_DROP;
+}
+
+
+static struct hdlc_proto proto = {
+	.open		= x25_open,
+	.close		= x25_close,
+	.ioctl		= x25_ioctl,
+	.netif_rx	= x25_rx,
+	.xmit		= x25_xmit,
+	.module		= THIS_MODULE,
+};
+
+
+static int x25_ioctl(struct net_device *dev, struct ifreq *ifr)
+{
+	hdlc_device *hdlc = dev_to_hdlc(dev);
+	int result;
+
+	switch (ifr->ifr_settings.type) {
+	case IF_GET_PROTO:
+		if (dev_to_hdlc(dev)->proto != &proto)
+			return -EINVAL;
+		ifr->ifr_settings.type = IF_PROTO_X25;
+		return 0; /* return protocol only, no settable parameters */
+
+	case IF_PROTO_X25:
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (dev->flags & IFF_UP)
+			return -EBUSY;
+
+		result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
+		if (result)
+			return result;
+
+		if ((result = attach_hdlc_protocol(dev, &proto, 0)))
+			return result;
+		dev->type = ARPHRD_X25;
+		call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
+		netif_dormant_off(dev);
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+
+static int __init mod_init(void)
+{
+	register_hdlc_protocol(&proto);
+	return 0;
+}
+
+
+
+static void __exit mod_exit(void)
+{
+	unregister_hdlc_protocol(&proto);
+}
+
+
+module_init(mod_init);
+module_exit(mod_exit);
+
+MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
+MODULE_DESCRIPTION("X.25 protocol support for generic HDLC");
+MODULE_LICENSE("GPL v2");