patch-2.0.35 linux/net/rose/rose_link.c

• Lines: 319
• Date: Mon Jul 13 13:47:41 1998
• Orig file: v2.0.34/linux/net/rose/rose_link.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.34/linux/net/rose/rose_link.c linux/net/rose/rose_link.c
@@ -0,0 +1,318 @@
+/*
+ *	ROSE release 003
+ *
+ *	This code REQUIRES 2.1.0 or higher/ NET3.029
+ *
+ *	This module:
+ *		This module 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.
+ *
+ *	History
+ *	ROSE 001	Jonathan(G4KLX)	Cloned from rose_timer.c
+ */
+
+#include <linux/config.h>
+#if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/firewall.h>
+#include <net/rose.h>
+
+static void rose_link_timer(unsigned long);
+
+/*
+ *	Linux set timer
+ */
+void rose_link_set_timer(struct rose_neigh *neigh)
+{
+	unsigned long flags;
+
+	save_flags(flags); cli();
+	del_timer(&neigh->timer);
+	restore_flags(flags);
+
+	neigh->timer.data     = (unsigned long)neigh;
+	neigh->timer.function = &rose_link_timer;
+	neigh->timer.expires  = jiffies + 10;
+
+	add_timer(&neigh->timer);
+}
+
+/*
+ *	ROSE Link Timer
+ *
+ *	This routine is called every 100ms. Decrement timer by this
+ *	amount - if expired then process the event.
+ */
+static void rose_link_timer(unsigned long param)
+{
+	struct rose_neigh *neigh = (struct rose_neigh *)param;
+
+	if (neigh->ftimer > 0)
+		neigh->ftimer--;
+
+	if (neigh->t0timer > 0) {
+		neigh->t0timer--;
+
+		if (neigh->t0timer == 0) {
+			rose_transmit_restart_request(neigh);
+			neigh->dce_mode = 0;
+			neigh->t0timer  = sysctl_rose_restart_request_timeout;
+		}
+	}
+
+	if (neigh->ftimer > 0 || neigh->t0timer > 0)
+		rose_link_set_timer(neigh);
+	else
+		del_timer(&neigh->timer);
+}
+
+/*
+ *	Interface to ax25_send_frame. Changes my level 2 callsign depending
+ *	on whether we have a global ROSE callsign or use the default port
+ *	callsign.
+ */
+static int rose_send_frame(struct sk_buff *skb, struct rose_neigh *neigh)
+{
+	ax25_address *rose_call;
+
+	if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
+		rose_call = (ax25_address *)neigh->dev->dev_addr;
+	else
+		rose_call = &rose_callsign;
+
+	neigh->ax25 = ax25_send_frame(skb, 0, rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
+
+	return (neigh->ax25 != NULL);
+}
+
+/*
+ *	Interface to ax25_link_up. Changes my level 2 callsign depending
+ *	on whether we have a global ROSE callsign or use the default port
+ *	callsign.
+ */
+static int rose_link_up(struct rose_neigh *neigh)
+{
+	ax25_address *rose_call;
+
+	if (ax25cmp(&rose_callsign, &null_ax25_address) == 0)
+		rose_call = (ax25_address *)neigh->dev->dev_addr;
+	else
+		rose_call = &rose_callsign;
+
+	neigh->ax25 = ax25_find_cb(rose_call, &neigh->callsign, neigh->digipeat, neigh->dev);
+
+	return (neigh->ax25 != NULL);
+}
+
+/*
+ *	This handles all restart and diagnostic frames.
+ */
+void rose_link_rx_restart(struct sk_buff *skb, struct rose_neigh *neigh, unsigned short frametype)
+{
+	struct sk_buff *skbn;
+
+	switch (frametype) {
+		case ROSE_RESTART_REQUEST:
+			neigh->t0timer   = 0;
+			neigh->restarted = 1;
+			neigh->dce_mode  = (skb->data[3] == ROSE_DTE_ORIGINATED);
+			del_timer(&neigh->timer);
+			rose_transmit_restart_confirmation(neigh);
+			break;
+
+		case ROSE_RESTART_CONFIRMATION:
+			neigh->t0timer   = 0;
+			neigh->restarted = 1;
+			del_timer(&neigh->timer);
+			break;
+
+		case ROSE_DIAGNOSTIC:
+			printk(KERN_WARNING "rose: diagnostic #%d - %02X %02X %02X\n", skb->data[3], skb->data[4], skb->data[5], skb->data[6]);
+			break;
+
+		default:
+			printk(KERN_WARNING "rose: received unknown %02X with LCI 000\n", frametype);
+			break;
+	}
+
+	if (neigh->restarted) {
+		while ((skbn = skb_dequeue(&neigh->queue)) != NULL)
+			if (!rose_send_frame(skbn, neigh))
+				kfree_skb(skbn, FREE_WRITE);
+	}
+}
+
+/*
+ *	This routine is called when a Restart Request is needed
+ */
+void rose_transmit_restart_request(struct rose_neigh *neigh)
+{
+	struct sk_buff *skb;
+	unsigned char *dptr;
+	int len;
+
+	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
+
+	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
+		return;
+
+	skb->free = 1;
+
+	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
+
+	dptr = skb_put(skb, ROSE_MIN_LEN + 3);
+
+	*dptr++ = AX25_P_ROSE;
+	*dptr++ = ROSE_GFI;
+	*dptr++ = 0x00;
+	*dptr++ = ROSE_RESTART_REQUEST;
+	*dptr++ = ROSE_DTE_ORIGINATED;
+	*dptr++ = 0;
+
+	if (!rose_send_frame(skb, neigh))
+		kfree_skb(skb, FREE_WRITE);
+}
+
+/*
+ * This routine is called when a Restart Confirmation is needed
+ */
+void rose_transmit_restart_confirmation(struct rose_neigh *neigh)
+{
+	struct sk_buff *skb;
+	unsigned char *dptr;
+	int len;
+
+	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
+
+	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
+		return;
+
+	skb->free = 1;
+
+	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
+
+	dptr = skb_put(skb, ROSE_MIN_LEN + 1);
+
+	*dptr++ = AX25_P_ROSE;
+	*dptr++ = ROSE_GFI;
+	*dptr++ = 0x00;
+	*dptr++ = ROSE_RESTART_CONFIRMATION;
+
+	if (!rose_send_frame(skb, neigh))
+		kfree_skb(skb, FREE_WRITE);
+}
+
+/*
+ * This routine is called when a Diagnostic is required.
+ */
+void rose_transmit_diagnostic(struct rose_neigh *neigh, unsigned char diag)
+{
+	struct sk_buff *skb;
+	unsigned char *dptr;
+	int len;
+
+	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 2;
+
+	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
+		return;
+
+	skb->free = 1;
+
+	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
+
+	dptr = skb_put(skb, ROSE_MIN_LEN + 2);
+
+	*dptr++ = AX25_P_ROSE;
+	*dptr++ = ROSE_GFI;
+	*dptr++ = 0x00;
+	*dptr++ = ROSE_DIAGNOSTIC;
+	*dptr++ = diag;
+
+	if (!rose_send_frame(skb, neigh))
+		kfree_skb(skb, FREE_WRITE);
+}
+
+/*
+ * This routine is called when a Clear Request is needed outside of the context
+ * of a connected socket.
+ */
+void rose_transmit_clear_request(struct rose_neigh *neigh, unsigned int lci, unsigned char cause, unsigned char diagnostic)
+{
+	struct sk_buff *skb;
+	unsigned char *dptr;
+	int len;
+
+	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 3;
+
+	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
+		return;
+
+	skb->free = 1;
+
+	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
+
+	dptr = skb_put(skb, ROSE_MIN_LEN + 3);
+
+	*dptr++ = AX25_P_ROSE;
+	*dptr++ = ((lci >> 8) & 0x0F) | ROSE_GFI;
+	*dptr++ = ((lci >> 0) & 0xFF);
+	*dptr++ = ROSE_CLEAR_REQUEST;
+	*dptr++ = cause;
+	*dptr++ = diagnostic;
+
+	if (!rose_send_frame(skb, neigh))
+		kfree_skb(skb, FREE_WRITE);
+}
+
+void rose_transmit_link(struct sk_buff *skb, struct rose_neigh *neigh)
+{
+	unsigned char *dptr;
+
+#ifdef CONFIG_FIREWALL
+	if (call_fw_firewall(PF_ROSE, skb->dev, skb->data, NULL) != FW_ACCEPT)
+		return;
+#endif
+
+	if (!rose_link_up(neigh))
+		neigh->restarted = 0;
+
+	dptr = skb_push(skb, 1);
+	*dptr++ = AX25_P_ROSE;
+
+	if (neigh->restarted) {
+		if (!rose_send_frame(skb, neigh))
+			kfree_skb(skb, FREE_WRITE);
+	} else {
+		skb_queue_tail(&neigh->queue, skb);
+
+		if (neigh->t0timer == 0) {
+			rose_transmit_restart_request(neigh);
+			neigh->dce_mode = 0;
+			neigh->t0timer  = sysctl_rose_restart_request_timeout;
+			rose_link_set_timer(neigh);
+		}
+	}
+}
+
+#endif