1 files changed, 45 insertions, 311 deletions

diff --git a/net/ax25/ax25_out.c b/net/ax25/ax25_out.c
index 231c170e7..a222ad1e8 100644
--- a/net/ax25/ax25_out.c
+++ b/net/ax25/ax25_out.c
@@ -1,129 +1,74 @@
 /*
- *	AX.25 release 037
+ * ax25_out.c:  Subroutines for outgoing packets
  *
- *	This code REQUIRES 2.1.15 or higher/ NET3.038
+ * Authors:     Jens David (DG1KJD), Matthias Welwarsky (DG2FEF), Jonathan (G4KL
+ *              Alan Cox (GW4PTS), Joerg (DL1BKE), et al
  *
- *	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.
+ * Comment:     Most of this code is based on the SDL diagrams published in the
+ *              ARRL Computer Networking Conference papers. The diagrams have mi
+ *              in them, but are mostly correct. Before you modify the code coul
+ *              read the SDL diagrams as the code is not obvious and probably ve
+ *              easy to break;
  *
- *	Most of this code is based on the SDL diagrams published in the 7th
- *	ARRL Computer Networking Conference papers. The diagrams have mistakes
- *	in them, but are mostly correct. Before you modify the code could you
- *	read the SDL diagrams as the code is not obvious and probably very
- *	easy to break;
+ * Changelog:
  *
- *	History
- *	AX.25 028a	Jonathan(G4KLX)	New state machine based on SDL diagrams.
- *	AX.25 029	Alan(GW4PTS)	Switched to KA9Q constant names.
- *			Jonathan(G4KLX)	Only poll when window is full.
- *	AX.25 030	Jonathan(G4KLX)	Added fragmentation to ax25_output.
- *					Added support for extended AX.25.
- *	AX.25 031	Joerg(DL1BKE)	Added DAMA support
- *			Joerg(DL1BKE)	Modified fragmenter to fragment vanilla 
- *					AX.25 I-Frames. Added PACLEN parameter.
- *			Joerg(DL1BKE)	Fixed a problem with buffer allocation
- *					for fragments.
- *	AX.25 037	Jonathan(G4KLX)	New timer architecture.
- *			Joerg(DL1BKE)	Fixed DAMA Slave mode: will work
- *					on non-DAMA interfaces like AX25L2V2
- *					again (this behaviour is _required_).
- *			Joerg(DL1BKE)	ax25_check_iframes_acked() returns a 
- *					value now (for DAMA n2count handling)
+ * License:     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.
  */
 
 #include <linux/config.h>
-#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 <linux/netfilter.h>
+#include <net/ax25.h>
+#include <net/ax25dev.h>
 #include <net/sock.h>
-#include <asm/uaccess.h>
-#include <asm/system.h>
-#include <linux/fcntl.h>
-#include <linux/mm.h>
-#include <linux/interrupt.h>
 
-ax25_cb *ax25_send_frame(struct sk_buff *skb, int paclen, ax25_address *src, ax25_address *dest, ax25_digi *digi, struct net_device *dev)
+#include "ax25_core.h"
+#include "ax25_route.h"
+#include "ax25_vj.h"
+#include "ax25_ddi.h"
+#include "ax25_subr.h"
+
+/* ---------------------------------------------------------------------*/
+/*
+ *      send an iframe on a connection, maybe establish the connection first.
+ */
+ax25_cb *ax25_send_frame(struct sk_buff *skb, int paclen, ax25_addr_t *addr, struct net_device *dev)
 {
-	ax25_dev *ax25_dev;
 	ax25_cb *ax25;
 
-	/*
-	 * Take the default packet length for the device if zero is
-	 * specified.
-	 */
-	if (paclen == 0) {
-		if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
-			return NULL;
-
-		paclen = ax25_dev->values[AX25_VALUES_PACLEN];
-	}
+	if (paclen == 0)
+		paclen = ax25_dev_get_value(dev, AX25_VALUES_PACLEN);
 
 	/*
 	 * Look for an existing connection.
 	 */
-	if ((ax25 = ax25_find_cb(src, dest, digi, dev)) != NULL) {
+	if ((ax25 = ax25_find_cb(addr, dev)) != NULL) {
+		/* reuse a just disconnected control block */
+		if (ax25->state == AX25_STATE_0 || ax25->state == AX25_STATE_2) {
+			if (ax25->slcomp) {
+				axhc_free(ax25->slcomp);
+				ax25->slcomp = NULL;
+			}
+			ax25->slcomp_enable = ax25_rt_mode_get(&addr->dest) == 'C';
+			ax25_establish_data_link(ax25);
+		}
 		ax25_output(ax25, paclen, skb);
 		return ax25;		/* It already existed */
 	}
 
-	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
-		return NULL;
-
 	if ((ax25 = ax25_create_cb()) == NULL)
 		return NULL;
 
-	ax25_fillin_cb(ax25, ax25_dev);
+	ax25_fillin_cb(ax25, dev);
 
-	ax25->source_addr = *src;
-	ax25->dest_addr   = *dest;
-
-	if (digi != NULL) {
-		if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
-			ax25_free_cb(ax25);
-			return NULL;
-		}
-		memcpy(ax25->digipeat, digi, sizeof(ax25_digi));
-	}
-
-	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
-		case AX25_PROTO_STD_SIMPLEX:
-		case AX25_PROTO_STD_DUPLEX:
-			ax25_std_establish_data_link(ax25);
-			break;
-
-#ifdef CONFIG_AX25_DAMA_SLAVE
-		case AX25_PROTO_DAMA_SLAVE:
-			if (ax25_dev->dama.slave)
-				ax25_ds_establish_data_link(ax25);
-			else
-				ax25_std_establish_data_link(ax25);
-			break;
-#endif
-	}
-
-	ax25_insert_socket(ax25);
-
-	ax25->state = AX25_STATE_1;
-
-	ax25_start_heartbeat(ax25);
+	ax25->addr = *addr;
+	ax25->slcomp_enable = ax25_rt_mode_get(&addr->dest) == 'C';
 
+	ax25_establish_data_link(ax25);
+	ax25_insert_cb(ax25);
 	ax25_output(ax25, paclen, skb);
-
 	return ax25;			/* We had to create it */
 }
 
@@ -138,7 +83,6 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
 	struct sk_buff *skbn;
 	unsigned char *p;
 	int frontlen, len, fragno, ka9qfrag, first = 1;
-	long flags;
 
 	if ((skb->len - 1) > paclen) {
 		if (*skb->data == AX25_P_TEXT) {
@@ -155,11 +99,7 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
 		frontlen = skb_headroom(skb);	/* Address space + CTRL */
 
 		while (skb->len > 0) {
-			save_flags(flags); 
-			cli();
-
 			if ((skbn = alloc_skb(paclen + 2 + frontlen, GFP_ATOMIC)) == NULL) {
-				restore_flags(flags);
 				printk(KERN_CRIT "AX.25: ax25_output - out of memory\n");
 				return;
 			}
@@ -167,13 +107,11 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
 			if (skb->sk != NULL)
 				skb_set_owner_w(skbn, skb->sk);
 			
-			restore_flags(flags);
-			
 			len = (paclen > skb->len) ? skb->len : paclen;
 
 			if (ka9qfrag == 1) {
 				skb_reserve(skbn, frontlen + 2);
-				skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
+
 				memcpy(skb_put(skbn, len), skb->data, len);
 				p = skb_push(skbn, 2);
 
@@ -186,7 +124,6 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
 				}
 			} else {
 				skb_reserve(skbn, frontlen + 1);
-				skbn->nh.raw = skbn->data + (skb->nh.raw - skb->data);
 				memcpy(skb_put(skbn, len), skb->data, len);
 				p = skb_push(skbn, 1);
 				*p = AX25_P_TEXT;
@@ -201,209 +138,6 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
 		skb_queue_tail(&ax25->write_queue, skb);	  /* Throw it on the queue */
 	}
 
-	switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
-		case AX25_PROTO_STD_SIMPLEX:
-		case AX25_PROTO_STD_DUPLEX:
-			ax25_kick(ax25);
-			break;
-
-#ifdef CONFIG_AX25_DAMA_SLAVE
-		/* 
-		 * A DAMA slave is _required_ to work as normal AX.25L2V2
-		 * if no DAMA master is available.
-		 */
-		case AX25_PROTO_DAMA_SLAVE:
-			if (!ax25->ax25_dev->dama.slave) ax25_kick(ax25);
-			break;
-#endif
-	}
-}
-
-/* 
- *  This procedure is passed a buffer descriptor for an iframe. It builds
- *  the rest of the control part of the frame and then writes it out.
- */
-static void ax25_send_iframe(ax25_cb *ax25, struct sk_buff *skb, int poll_bit)
-{
-	unsigned char *frame;
-
-	if (skb == NULL)
-		return;
-
-	skb->nh.raw = skb->data;
-
-	if (ax25->modulus == AX25_MODULUS) {
-		frame = skb_push(skb, 1);
-
-		*frame = AX25_I;
-		*frame |= (poll_bit) ? AX25_PF : 0;
-		*frame |= (ax25->vr << 5);
-		*frame |= (ax25->vs << 1);
-	} else {
-		frame = skb_push(skb, 2);
-
-		frame[0] = AX25_I;
-		frame[0] |= (ax25->vs << 1);
-		frame[1] = (poll_bit) ? AX25_EPF : 0;
-		frame[1] |= (ax25->vr << 1);
-	}
-
-	ax25_start_idletimer(ax25);
-
-	ax25_transmit_buffer(ax25, skb, AX25_COMMAND);
-}
-
-void ax25_kick(ax25_cb *ax25)
-{
-	struct sk_buff *skb, *skbn;
-	int last = 1;
-	unsigned short start, end, next;
-
-	if (ax25->state != AX25_STATE_3 && ax25->state != AX25_STATE_4)
-		return;
-
-	if (ax25->condition & AX25_COND_PEER_RX_BUSY)
-		return;
-
-	if (skb_peek(&ax25->write_queue) == NULL)
-		return;
-
-	start = (skb_peek(&ax25->ack_queue) == NULL) ? ax25->va : ax25->vs;
-	end   = (ax25->va + ax25->window) % ax25->modulus;
-
-	if (start == end)
-		return;
-
-	ax25->vs = start;
-
-	/*
-	 * Transmit data until either we're out of data to send or
-	 * the window is full. Send a poll on the final I frame if
-	 * the window is filled.
-	 */
-
-	/*
-	 * Dequeue the frame and copy it.
-	 */
-	skb  = skb_dequeue(&ax25->write_queue);
-
-	do {
-		if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
-			skb_queue_head(&ax25->write_queue, skb);
-			break;
-		}
-
-		if (skb->sk != NULL)
-			skb_set_owner_w(skbn, skb->sk);
-
-		next = (ax25->vs + 1) % ax25->modulus;
-		last = (next == end);
-
-		/*
-		 * Transmit the frame copy.
-		 * bke 960114: do not set the Poll bit on the last frame
-		 * in DAMA mode.
-		 */
-		switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
-			case AX25_PROTO_STD_SIMPLEX:
-			case AX25_PROTO_STD_DUPLEX:
-				ax25_send_iframe(ax25, skbn, (last) ? AX25_POLLON : AX25_POLLOFF);
-				break;
-
-#ifdef CONFIG_AX25_DAMA_SLAVE
-			case AX25_PROTO_DAMA_SLAVE:
-				ax25_send_iframe(ax25, skbn, AX25_POLLOFF);
-				break;
-#endif
-		}
-
-		ax25->vs = next;
-
-		/*
-		 * Requeue the original data frame.
-		 */
-		skb_queue_tail(&ax25->ack_queue, skb);
-
-	} while (!last && (skb = skb_dequeue(&ax25->write_queue)) != NULL);
-
-	ax25->condition &= ~AX25_COND_ACK_PENDING;
-
-	if (!ax25_t1timer_running(ax25)) {
-		ax25_stop_t3timer(ax25);
-		ax25_calculate_t1(ax25);
-		ax25_start_t1timer(ax25);
-	}
-}
-
-void ax25_transmit_buffer(ax25_cb *ax25, struct sk_buff *skb, int type)
-{
-	struct sk_buff *skbn;
-	unsigned char *ptr;
-	int headroom;
-
-	if (ax25->ax25_dev == NULL) {
-		ax25_disconnect(ax25, ENETUNREACH);
-		return;
-	}
-
-	headroom = ax25_addr_size(ax25->digipeat);
-
-	if (skb_headroom(skb) < headroom) {
-		if ((skbn = skb_realloc_headroom(skb, headroom)) == NULL) {
-			printk(KERN_CRIT "AX.25: ax25_transmit_buffer - out of memory\n");
-			kfree_skb(skb);
-			return;
-		}
-
-		if (skb->sk != NULL)
-			skb_set_owner_w(skbn, skb->sk);
-
-		kfree_skb(skb);
-		skb = skbn;
-	}
-
-	ptr = skb_push(skb, headroom);
-
-	ax25_addr_build(ptr, &ax25->source_addr, &ax25->dest_addr, ax25->digipeat, type, ax25->modulus);
-
-	skb->dev = ax25->ax25_dev->dev;
-
-	ax25_queue_xmit(skb);
-}
-
-/*
- *	A small shim to dev_queue_xmit to add the KISS control byte, and do
- *	any packet forwarding in operation.
- */
-void ax25_queue_xmit(struct sk_buff *skb)
-{
-	unsigned char *ptr;
-
-	skb->protocol = htons(ETH_P_AX25);
-	skb->dev      = ax25_fwd_dev(skb->dev);
-
-	ptr  = skb_push(skb, 1);
-	*ptr = 0x00;			/* KISS */
-
-	dev_queue_xmit(skb);
-}
-
-int ax25_check_iframes_acked(ax25_cb *ax25, unsigned short nr)
-{
-	if (ax25->vs == nr) {
-		ax25_frames_acked(ax25, nr);
-		ax25_calculate_rtt(ax25);
-		ax25_stop_t1timer(ax25);
-		ax25_start_t3timer(ax25);
-		return 1;
-	} else {
-		if (ax25->va != nr) {
-			ax25_frames_acked(ax25, nr);
-			ax25_calculate_t1(ax25);
-			ax25_start_t1timer(ax25);
-			return 1;
-		}
-	}
-	return 0;
+	ax25_kick(ax25);
 }