patch-2.1.9 linux/net/rose/rose_in.c

• Lines: 336
• Date: Sun Nov 10 19:12:58 1996
• Orig file: v2.1.8/linux/net/rose/rose_in.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.8/linux/net/rose/rose_in.c linux/net/rose/rose_in.c
@@ -0,0 +1,335 @@
+/*
+ *	Rose release 001
+ *
+ *	This is ALPHA test software. This code may break your machine, randomly fail to work with new 
+ *	releases, misbehave and/or generally screw up. It might even work. 
+ *
+ *	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.
+ *
+ *	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;
+ *
+ *	History
+ *	Rose 001	Jonathan(G4KLX)	Cloned from nr_in.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 <net/ip.h>			/* For ip_rcv */
+#include <asm/segment.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <net/rose.h>
+
+static int rose_queue_rx_frame(struct sock *sk, struct sk_buff *skb, int more)
+{
+	struct sk_buff *skbo, *skbn = skb;
+
+	if (more) {
+		sk->protinfo.rose->fraglen += skb->len;
+		skb_queue_tail(&sk->protinfo.rose->frag_queue, skb);
+		return 0;
+	}
+	
+	if (!more && sk->protinfo.rose->fraglen > 0) {	/* End of fragment */
+		sk->protinfo.rose->fraglen += skb->len;
+		skb_queue_tail(&sk->protinfo.rose->frag_queue, skb);
+
+		if ((skbn = alloc_skb(sk->protinfo.rose->fraglen, GFP_ATOMIC)) == NULL)
+			return 1;
+
+		skbn->free = 1;
+		skbn->arp  = 1;
+		skbn->sk   = sk;
+		sk->rmem_alloc += skbn->truesize;
+		skbn->h.raw = skbn->data;
+
+		skbo = skb_dequeue(&sk->protinfo.rose->frag_queue);
+		memcpy(skb_put(skbn, skbo->len), skbo->data, skbo->len);
+		kfree_skb(skbo, FREE_READ);
+
+		while ((skbo = skb_dequeue(&sk->protinfo.rose->frag_queue)) != NULL) {
+			skb_pull(skbo, ROSE_MIN_LEN);
+			memcpy(skb_put(skbn, skbo->len), skbo->data, skbo->len);
+			kfree_skb(skbo, FREE_READ);
+		}
+
+		sk->protinfo.rose->fraglen = 0;		
+	}
+
+	return sock_queue_rcv_skb(sk, skbn);
+}
+
+/*
+ * State machine for state 1, Awaiting Call Accepted State.
+ * The handling of the timer(s) is in file rose_timer.c.
+ * Handling of state 0 and connection release is in af_rose.c.
+ */
+static int rose_state1_machine(struct sock *sk, struct sk_buff *skb, int frametype)
+{
+	switch (frametype) {
+
+		case ROSE_CALL_ACCEPTED:
+			sk->protinfo.rose->timer = 0;
+			sk->protinfo.rose->vs    = 0;
+			sk->protinfo.rose->va    = 0;
+			sk->protinfo.rose->vr    = 0;
+			sk->protinfo.rose->vl    = 0;
+			sk->protinfo.rose->state = ROSE_STATE_3;
+			sk->state                = TCP_ESTABLISHED;
+			if (!sk->dead)
+				sk->state_change(sk);
+			break;
+
+		case ROSE_CLEAR_REQUEST:
+			rose_clear_queues(sk);
+			sk->protinfo.rose->state = ROSE_STATE_0;
+			sk->state                = TCP_CLOSE;
+			sk->err                  = ECONNREFUSED;
+			if (!sk->dead)
+				sk->state_change(sk);
+			sk->dead                 = 1;
+			break;
+
+		default:		/* XXX */
+			printk(KERN_WARNING "rose: unknown %02X in state 1\n", frametype);
+			break;
+	}
+
+	return 0;
+}
+
+/*
+ * State machine for state 2, Awaiting Clear Confirmation State.
+ * The handling of the timer(s) is in file rose_timer.c
+ * Handling of state 0 and connection release is in af_rose.c.
+ */
+static int rose_state2_machine(struct sock *sk, struct sk_buff *skb, int frametype)
+{
+	switch (frametype) {
+
+		case ROSE_CLEAR_REQUEST:
+		case ROSE_CLEAR_CONFIRMATION:
+			sk->protinfo.rose->state = ROSE_STATE_0;
+			sk->state                = TCP_CLOSE;
+			sk->err                  = 0;
+			if (!sk->dead)
+				sk->state_change(sk);
+			sk->dead                 = 1;
+			break;
+
+		default:		/* XXX */
+			printk(KERN_WARNING "rose: unknown %02X in state 2\n", frametype);
+			break;
+	}
+
+	return 0;
+}
+
+/*
+ * State machine for state 3, Connected State.
+ * The handling of the timer(s) is in file rose_timer.c
+ * Handling of state 0 and connection release is in af_rose.c.
+ */
+static int rose_state3_machine(struct sock *sk, struct sk_buff *skb, int frametype, int ns, int nr, int q, int d, int m)
+{
+	int queued = 0;
+
+	switch (frametype) {
+
+		case ROSE_RESET_REQUEST:
+			rose_clear_queues(sk);
+			rose_write_internal(sk, ROSE_RESET_CONFIRMATION);
+			sk->protinfo.rose->condition = 0x00;
+			sk->protinfo.rose->vs        = 0;
+			sk->protinfo.rose->vr        = 0;
+			sk->protinfo.rose->va        = 0;
+			sk->protinfo.rose->vl        = 0;
+			break;
+
+		case ROSE_CLEAR_REQUEST:
+			rose_clear_queues(sk);
+			rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);
+			sk->protinfo.rose->state = ROSE_STATE_0;
+			sk->state                = TCP_CLOSE;
+			sk->err                  = 0;
+			if (!sk->dead)
+				sk->state_change(sk);
+			sk->dead                 = 1;
+			break;
+
+		case ROSE_RR:
+		case ROSE_RNR:
+			if (frametype == ROSE_RNR) {
+				sk->protinfo.rose->condition |= PEER_RX_BUSY_CONDITION;
+			} else {
+				sk->protinfo.rose->condition &= ~PEER_RX_BUSY_CONDITION;
+			}
+			if (!rose_validate_nr(sk, nr)) {
+				rose_clear_queues(sk);
+				rose_write_internal(sk, ROSE_RESET_REQUEST);
+				sk->protinfo.rose->condition = 0x00;
+				sk->protinfo.rose->vs        = 0;
+				sk->protinfo.rose->vr        = 0;
+				sk->protinfo.rose->va        = 0;
+				sk->protinfo.rose->vl        = 0;
+				sk->protinfo.rose->state     = ROSE_STATE_4;
+				sk->protinfo.rose->timer     = sk->protinfo.rose->t2;
+			} else {
+				if (sk->protinfo.rose->condition & PEER_RX_BUSY_CONDITION) {
+					rose_frames_acked(sk, nr);
+				} else {
+					rose_check_iframes_acked(sk, nr);
+				}
+			}
+			break;
+			
+		case ROSE_DATA:	/* XXX */
+			sk->protinfo.rose->condition &= ~PEER_RX_BUSY_CONDITION;
+			if (!rose_validate_nr(sk, nr)) {
+				rose_clear_queues(sk);
+				rose_write_internal(sk, ROSE_RESET_REQUEST);
+				sk->protinfo.rose->condition = 0x00;
+				sk->protinfo.rose->vs        = 0;
+				sk->protinfo.rose->vr        = 0;
+				sk->protinfo.rose->va        = 0;
+				sk->protinfo.rose->vl        = 0;
+				sk->protinfo.rose->state     = ROSE_STATE_4;
+				sk->protinfo.rose->timer     = sk->protinfo.rose->t2;
+				break;
+			}
+			if (sk->protinfo.rose->condition & PEER_RX_BUSY_CONDITION) {
+				rose_frames_acked(sk, nr);
+			} else {
+				rose_check_iframes_acked(sk, nr);
+			}
+			if (sk->protinfo.rose->condition & OWN_RX_BUSY_CONDITION)
+				break;
+			if (ns == sk->protinfo.rose->vr) {
+				if (rose_queue_rx_frame(sk, skb, m) == 0) {
+					sk->protinfo.rose->vr = (sk->protinfo.rose->vr + 1) % ROSE_MODULUS;
+					queued = 1;
+				} else {
+					sk->protinfo.rose->condition |= OWN_RX_BUSY_CONDITION;
+				}
+			}
+			/*
+			 * If the window is full, ack the frame.
+			 */
+			if (((sk->protinfo.rose->vl + sk->window) % ROSE_MODULUS) == sk->protinfo.rose->vr)
+				rose_enquiry_response(sk);
+			break;
+
+		default:
+			printk(KERN_WARNING "rose: unknown %02X in state 3\n", frametype);
+			break;
+	}
+
+	return queued;
+}
+
+/*
+ * State machine for state 4, Awaiting Reset Confirmation State.
+ * The handling of the timer(s) is in file rose_timer.c
+ * Handling of state 0 and connection release is in af_rose.c.
+ */
+static int rose_state4_machine(struct sock *sk, struct sk_buff *skb, int frametype)
+{
+	switch (frametype) {
+
+		case ROSE_RESET_CONFIRMATION:
+		case ROSE_RESET_REQUEST:
+			sk->protinfo.rose->timer     = 0;
+			sk->protinfo.rose->condition = 0x00;
+			sk->protinfo.rose->va        = 0;
+			sk->protinfo.rose->vr        = 0;
+			sk->protinfo.rose->vs        = 0;
+			sk->protinfo.rose->vl        = 0;
+			sk->protinfo.rose->state     = ROSE_STATE_3;
+			break;
+
+		case ROSE_CLEAR_REQUEST:
+			rose_clear_queues(sk);
+			rose_write_internal(sk, ROSE_CLEAR_CONFIRMATION);
+			sk->protinfo.rose->timer = 0;
+			sk->protinfo.rose->state = ROSE_STATE_0;
+			sk->state                = TCP_CLOSE;
+			sk->err                  = 0;
+			if (!sk->dead)
+				sk->state_change(sk);
+			sk->dead                 = 1;
+			break;
+
+		default:		/* XXX */
+			printk(KERN_WARNING "rose: unknown %02X in state 4\n", frametype);
+			break;
+	}
+
+	return 0;
+}
+
+/* Higher level upcall for a LAPB frame */
+int rose_process_rx_frame(struct sock *sk, struct sk_buff *skb)
+{
+	int queued = 0, frametype, ns, nr, q, d, m;
+	
+	if (sk->protinfo.rose->state == ROSE_STATE_0 && sk->dead)
+		return queued;
+
+	if (sk->protinfo.rose->state != ROSE_STATE_1 && sk->protinfo.rose->state != ROSE_STATE_2 &&
+	    sk->protinfo.rose->state != ROSE_STATE_3 && sk->protinfo.rose->state != ROSE_STATE_4) {
+		printk(KERN_ERR "rose_process_rx_frame: frame received - state: %d\n", sk->protinfo.rose->state);
+		return queued;
+	}
+
+	del_timer(&sk->timer);
+
+	frametype = rose_decode(skb, &ns, &nr, &q, &d, &m);
+
+	switch (sk->protinfo.rose->state) {
+		case ROSE_STATE_1:
+			queued = rose_state1_machine(sk, skb, frametype);
+			break;
+		case ROSE_STATE_2:
+			queued = rose_state2_machine(sk, skb, frametype);
+			break;
+		case ROSE_STATE_3:
+			queued = rose_state3_machine(sk, skb, frametype, ns, nr, q, d, m);
+			break;
+		case ROSE_STATE_4:
+			queued = rose_state4_machine(sk, skb, frametype);
+			break;
+	}
+
+	rose_set_timer(sk);
+
+	return queued;
+}
+
+#endif