Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

drivers/net/wan/hdlc_x25.c

@@ -0,0 +1,219 @@
+/*
+ * Generic HDLC support routines for Linux
+ * X.25 support
+ *
+ * Copyright (C) 1999 - 2003 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/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#include <linux/errno.h>
+#include <linux/if_arp.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/pkt_sched.h>
+#include <linux/inetdevice.h>
+#include <linux/lapb.h>
+#include <linux/rtnetlink.h>
+#include <linux/hdlc.h>
+
+#include <net/x25device.h>
+
+/* 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) {
+		printk(KERN_ERR "%s: out of memory\n", dev->name);
+		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, 1);
+}
+
+
+
+static void x25_disconnected(struct net_device *dev, int reason)
+{
+	x25_connect_disconnect(dev, reason, 2);
+}
+
+
+
+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 = 0;
+
+	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 int x25_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	int result;
+
+
+	/* X.25 to LAPB */
+	switch (skb->data[0]) {
+	case 0:		/* Data to be transmitted */
+		skb_pull(skb, 1);
+		if ((result = lapb_data_request(dev, skb)) != LAPB_OK)
+			dev_kfree_skb(skb);
+		return 0;
+
+	case 1:
+		if ((result = lapb_connect_request(dev))!= LAPB_OK) {
+			if (result == LAPB_CONNECTED)
+				/* Send connect confirm. msg to level 3 */
+				x25_connected(dev, 0);
+			else
+				printk(KERN_ERR "%s: LAPB connect request "
+				       "failed, error code = %i\n",
+				       dev->name, result);
+		}
+		break;
+
+	case 2:
+		if ((result = lapb_disconnect_request(dev)) != LAPB_OK) {
+			if (result == LAPB_NOTCONNECTED)
+				/* Send disconnect confirm. msg to level 3 */
+				x25_disconnected(dev, 0);
+			else
+				printk(KERN_ERR "%s: LAPB disconnect request "
+				       "failed, error code = %i\n",
+				       dev->name, result);
+		}
+		break;
+
+	default:		/* to be defined */
+		break;
+	}
+
+	dev_kfree_skb(skb);
+	return 0;
+}
+
+
+
+static int x25_open(struct net_device *dev)
+{
+	struct lapb_register_struct cb;
+	int result;
+
+	cb.connect_confirmation = x25_connected;
+	cb.connect_indication = x25_connected;
+	cb.disconnect_confirmation = x25_disconnected;
+	cb.disconnect_indication = x25_disconnected;
+	cb.data_indication = x25_data_indication;
+	cb.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)
+{
+	hdlc_device *hdlc = dev_to_hdlc(skb->dev);
+
+	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
+		hdlc->stats.rx_dropped++;
+		return NET_RX_DROP;
+	}
+
+	if (lapb_data_received(skb->dev, skb) == LAPB_OK)
+		return NET_RX_SUCCESS;
+
+	hdlc->stats.rx_errors++;
+	dev_kfree_skb_any(skb);
+	return NET_RX_DROP;
+}
+
+
+
+int hdlc_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:
+		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;
+
+		hdlc_proto_detach(hdlc);
+		memset(&hdlc->proto, 0, sizeof(hdlc->proto));
+
+		hdlc->proto.open = x25_open;
+		hdlc->proto.close = x25_close;
+		hdlc->proto.netif_rx = x25_rx;
+		hdlc->proto.type_trans = NULL;
+		hdlc->proto.id = IF_PROTO_X25;
+		dev->hard_start_xmit = x25_xmit;
+		dev->hard_header = NULL;
+		dev->type = ARPHRD_X25;
+		dev->addr_len = 0;
+		return 0;
+	}
+
+	return -EINVAL;
+}