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

• Lines: 495
• Date: Sun Nov 10 19:12:58 1996
• Orig file: v2.1.8/linux/net/rose/rose_subr.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.8/linux/net/rose/rose_subr.c linux/net/rose/rose_subr.c
@@ -0,0 +1,494 @@
+/*
+ *	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.
+ *
+ *	History
+ *	Rose 001	Jonathan(G4KLX)	Cloned from nr_subr.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 <net/rose.h>
+
+/*
+ *	This routine purges all of the queues of frames.
+ */
+void rose_clear_queues(struct sock *sk)
+{
+	struct sk_buff *skb;
+
+	while ((skb = skb_dequeue(&sk->write_queue)) != NULL) {
+		skb->sk   = sk;
+		skb->free = 1;
+		kfree_skb(skb, FREE_WRITE);
+	}
+
+	while ((skb = skb_dequeue(&sk->protinfo.rose->ack_queue)) != NULL) {
+		skb->sk   = sk;
+		skb->free = 1;
+		kfree_skb(skb, FREE_WRITE);
+	}
+
+	while ((skb = skb_dequeue(&sk->protinfo.rose->frag_queue)) != NULL) {
+		kfree_skb(skb, FREE_READ);
+	}
+}
+
+/*
+ * This routine purges the input queue of those frames that have been
+ * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
+ * SDL diagram.
+ */
+void rose_frames_acked(struct sock *sk, unsigned short nr)
+{
+	struct sk_buff *skb;
+
+	/*
+	 * Remove all the ack-ed frames from the ack queue.
+	 */
+	if (sk->protinfo.rose->va != nr) {
+		while (skb_peek(&sk->protinfo.rose->ack_queue) != NULL && sk->protinfo.rose->va != nr) {
+		        skb = skb_dequeue(&sk->protinfo.rose->ack_queue);
+		        skb->sk   = sk;
+			skb->free = 1;
+			kfree_skb(skb, FREE_WRITE);
+			sk->protinfo.rose->va = (sk->protinfo.rose->va + 1) % ROSE_MODULUS;
+		}
+	}
+}
+
+/*
+ * Requeue all the un-ack-ed frames on the output queue to be picked
+ * up by rose_kick called from the timer. This arrangement handles the
+ * possibility of an empty output queue.
+ */
+void rose_requeue_frames(struct sock *sk)
+{
+	struct sk_buff *skb, *skb_prev = NULL;
+
+	while ((skb = skb_dequeue(&sk->protinfo.rose->ack_queue)) != NULL) {
+		if (skb_prev == NULL)
+			skb_queue_head(&sk->write_queue, skb);
+		else
+			skb_append(skb_prev, skb);
+		skb_prev = skb;
+	}
+}
+
+/*
+ *	Validate that the value of nr is between va and vs. Return true or
+ *	false for testing.
+ */
+int rose_validate_nr(struct sock *sk, unsigned short nr)
+{
+	unsigned short vc = sk->protinfo.rose->va;
+
+	while (vc != sk->protinfo.rose->vs) {
+		if (nr == vc) return 1;
+		vc = (vc + 1) % ROSE_MODULUS;
+	}
+	
+	if (nr == sk->protinfo.rose->vs) return 1;
+
+	return 0;
+}
+
+/* 
+ *  This routine is called when the packet layer internally generates a
+ *  control frame.
+ */
+void rose_write_internal(struct sock *sk, int frametype)
+{
+	struct sk_buff *skb;
+	unsigned char  *dptr;
+	unsigned char  lci1, lci2;
+	char buffer[100];
+	int len, faclen = 0;
+
+	len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN + 1;
+	
+	switch (frametype) {
+		case ROSE_CALL_REQUEST:
+			len   += 1 + ROSE_ADDR_LEN + ROSE_ADDR_LEN;
+			faclen = rose_create_facilities(buffer, sk->protinfo.rose);
+			len   += faclen;
+			break;
+		case ROSE_CALL_ACCEPTED:
+		case ROSE_CLEAR_REQUEST:
+		case ROSE_RESET_REQUEST:
+		case ROSE_DIAGNOSTIC:
+			len   += 2;
+			break;
+		case ROSE_INTERRUPT:
+			len   += 1;
+			break;
+	}
+	
+	if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
+		return;
+
+	/*
+	 *	Space for AX.25 header and PID.
+	 */
+	skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + 1);
+	
+	dptr = skb_put(skb, skb_tailroom(skb));
+
+	lci1 = (sk->protinfo.rose->lci >> 8) & 0x0F;
+	lci2 = (sk->protinfo.rose->lci >> 0) & 0xFF;
+
+	switch (frametype) {
+	
+		case ROSE_CALL_REQUEST:
+			*dptr++ = GFI | lci1;
+			*dptr++ = lci2;
+			*dptr++ = frametype;
+			*dptr++ = 0xAA;
+			memcpy(dptr, &sk->protinfo.rose->dest_addr,  ROSE_ADDR_LEN);
+			dptr   += ROSE_ADDR_LEN;
+			memcpy(dptr, &sk->protinfo.rose->source_addr, ROSE_ADDR_LEN);
+			dptr   += ROSE_ADDR_LEN;
+			memcpy(dptr, buffer, faclen);
+			dptr   += faclen;
+			break;
+
+		case ROSE_CALL_ACCEPTED:
+			*dptr++ = GFI | lci1;
+			*dptr++ = lci2;
+			*dptr++ = frametype;
+			*dptr++ = 0x00;		/* Address length */
+			*dptr++ = 0;		/* Facilities length */
+			break;
+
+		case ROSE_CLEAR_REQUEST:
+		case ROSE_RESET_REQUEST:
+			*dptr++ = GFI | lci1;
+			*dptr++ = lci2;
+			*dptr++ = frametype;
+			*dptr++ = 0x00;		/* XXX */
+			*dptr++ = 0x00;		/* XXX */
+			break;
+
+		case ROSE_INTERRUPT:
+			*dptr++ = GFI | lci1;
+			*dptr++ = lci2;
+			*dptr++ = frametype;
+			*dptr++ = 0x00;		/* XXX */
+			break;
+
+		case ROSE_RR:
+		case ROSE_RNR:
+		case ROSE_REJ:
+			*dptr++ = GFI | lci1;
+			*dptr++ = lci2;
+			*dptr   = frametype;
+			*dptr++ |= (sk->protinfo.rose->vr << 5) & 0xE0;
+			break;
+		
+		case ROSE_CLEAR_CONFIRMATION:
+		case ROSE_INTERRUPT_CONFIRMATION:
+		case ROSE_RESET_CONFIRMATION:
+			*dptr++ = GFI | lci1;
+			*dptr++ = lci2;
+			*dptr++  = frametype;
+			break;
+
+		default:
+			printk(KERN_ERR "rose_write_internal: invalid frametype %02X\n", frametype);
+			kfree_skb(skb, FREE_WRITE);
+			return;
+	}
+
+	rose_transmit_link(skb, sk->protinfo.rose->neighbour);
+}
+
+int rose_decode(struct sk_buff *skb, int *ns, int *nr, int *q, int *d, int *m)
+{
+	unsigned char *frame;
+	
+	frame = skb->data;
+	
+	*ns = *nr = *q = *d = *m = 0;
+	
+	switch (frame[2]) {
+		case ROSE_CALL_REQUEST:
+		case ROSE_CALL_ACCEPTED:
+		case ROSE_CLEAR_REQUEST:
+		case ROSE_CLEAR_CONFIRMATION:
+		case ROSE_INTERRUPT:
+		case ROSE_INTERRUPT_CONFIRMATION:
+		case ROSE_RESET_REQUEST:
+		case ROSE_RESET_CONFIRMATION:
+		case ROSE_RESTART_REQUEST:
+		case ROSE_RESTART_CONFIRMATION:
+		case ROSE_REGISTRATION_REQUEST:
+		case ROSE_REGISTRATION_CONFIRMATION:
+		case ROSE_DIAGNOSTIC:
+			return frame[2];
+		default:
+			break;
+	}
+
+	if ((frame[2] & 0x1F) == ROSE_RR  ||
+	    (frame[2] & 0x1F) == ROSE_RNR ||
+	    (frame[2] & 0x1F) == ROSE_REJ) {
+		*nr = (frame[2] >> 5) & 0x07;
+		return frame[2] & 0x1F;
+	}
+
+	if ((frame[2] & 0x01) == ROSE_DATA) {
+		*q  = (frame[0] & Q_BIT) == Q_BIT;
+		*d  = (frame[0] & D_BIT) == D_BIT;
+		*m  = (frame[2] & M_BIT) == M_BIT;
+		*nr = (frame[2] >> 5) & 0x07;
+		*ns = (frame[2] >> 1) & 0x07;
+		return ROSE_DATA;
+	}
+	
+	return ROSE_ILLEGAL;
+}
+
+static int rose_parse_national(unsigned char *p, rose_cb *rose, int len)
+{
+	unsigned char l, n = 0;
+
+	do {
+		switch (*p & 0xC0) {
+			case 0x00:
+				p   += 2;
+				n   += 2;
+				len -= 2;
+				break;
+				
+			case 0x40:
+				if (*p == FAC_NATIONAL_RAND)
+					rose->rand = ((p[1] << 8) & 0xFF00) + ((p[2] << 0) & 0x00FF);
+				p   += 3;
+				n   += 3;
+				len -= 3;
+				break;
+
+			case 0x80:
+				p   += 4;
+				n   += 4;
+				len -= 4;
+				break;
+				
+			case 0xC0:
+				l = p[1];
+				if (*p == FAC_NATIONAL_DEST_DIGI) {
+					memcpy(&rose->source_digi, p + 2, AX25_ADDR_LEN);
+					rose->source_ndigis = 1;
+				}
+				if (*p == FAC_NATIONAL_SRC_DIGI) {
+					memcpy(&rose->dest_digi,   p + 2, AX25_ADDR_LEN);
+					rose->dest_ndigis = 1;
+				}
+				p   += l + 2;
+				n   += l + 2;
+				len -= l + 2;
+				break;
+		}
+	} while (*p != 0x00 && len > 0);
+
+	return n;
+}
+
+static int rose_parse_ccitt(unsigned char *p, rose_cb *rose, int len)
+{
+	unsigned char l, n = 0;
+	char callsign[11];
+
+	do {
+		switch (*p & 0xC0) {
+			case 0x00:
+				p   += 2;
+				n   += 2;
+				len -= 2;
+				break;
+				
+			case 0x40:
+				p   += 3;
+				n   += 3;
+				len -= 3;
+				break;
+
+			case 0x80:
+				p   += 4;
+				n   += 4;
+				len -= 4;
+				break;
+				
+			case 0xC0:
+				l = p[1];
+				if (*p == FAC_CCITT_DEST_NSAP) {
+					memcpy(&rose->source_addr, p + 7, ROSE_ADDR_LEN);
+					memcpy(callsign, p + 12,   l - 10);
+					callsign[l - 10] = '\0';
+					rose->source_call = *asc2ax(callsign);
+				}
+				if (*p == FAC_CCITT_SRC_NSAP) {
+					memcpy(&rose->dest_addr, p + 7, ROSE_ADDR_LEN);
+					memcpy(callsign, p + 12, l - 10);
+					callsign[l - 10] = '\0';
+					rose->dest_call = *asc2ax(callsign);
+				}
+				p   += l + 2;
+				n   += l + 2;
+				len -= l + 2;
+				break;
+		}
+	} while (*p != 0x00 && len > 0);
+
+	return n;
+}
+
+int rose_parse_facilities(struct sk_buff *skb, rose_cb *rose)
+{
+	int facilities_len, len;
+	unsigned char *p;
+
+	memset(rose, 0x00, sizeof(rose_cb));
+
+	len  = (((skb->data[3] >> 4) & 0x0F) + 1) / 2;
+	len += (((skb->data[3] >> 0) & 0x0F) + 1) / 2;
+
+	p = skb->data + len + 4;
+
+	facilities_len = *p++;
+	
+	if (facilities_len == 0)
+		return 0;
+
+	while (facilities_len > 0) {
+		if (*p == 0x00) {
+			facilities_len--;
+			p++;
+
+			switch (*p) {
+				case FAC_NATIONAL:		/* National */
+					len = rose_parse_national(p + 1, rose, facilities_len - 1);
+					facilities_len -= len + 1;
+					p += len + 1;
+					break;
+					
+				case FAC_CCITT:		/* CCITT */
+					len = rose_parse_ccitt(p + 1, rose, facilities_len - 1);
+					facilities_len -= len + 1;
+					p += len + 1;
+					break;
+					
+				default:
+					printk(KERN_DEBUG "rose_parse_facilities: unknown facilities family %02X\n", *p);
+					facilities_len--;
+					p++;
+					break;
+			}
+		}
+	}
+
+	return 1;
+}
+
+int rose_create_facilities(unsigned char *buffer, rose_cb *rose)
+{
+	unsigned char *p = buffer + 1;
+	char *callsign;
+	int len;
+	
+	/* National Facilities */
+	if (rose->rand != 0 || rose->source_ndigis == 1 || rose->dest_ndigis == 1) {
+		*p++ = 0x00;
+		*p++ = FAC_NATIONAL;
+
+		if (rose->rand != 0) {
+			*p++ = FAC_NATIONAL_RAND;
+			*p++ = (rose->rand >> 8) & 0xFF;
+			*p++ = (rose->rand >> 0) & 0xFF;
+		}
+		
+		if (rose->source_ndigis == 1) {
+			*p++ = FAC_NATIONAL_SRC_DIGI;
+			*p++ = AX25_ADDR_LEN;
+			memcpy(p, &rose->source_digi, AX25_ADDR_LEN);
+			p   += AX25_ADDR_LEN;
+		}
+
+		if (rose->dest_ndigis == 1) {
+			*p++ = FAC_NATIONAL_DEST_DIGI;
+			*p++ = AX25_ADDR_LEN;
+			memcpy(p, &rose->dest_digi, AX25_ADDR_LEN);
+			p   += AX25_ADDR_LEN;
+		}
+	}
+
+	*p++ = 0x00;
+	*p++ = FAC_CCITT;
+	
+	*p++ = FAC_CCITT_DEST_NSAP;
+	
+	callsign = ax2asc(&rose->dest_call);
+
+	*p++ = strlen(callsign) + 10;
+	*p++ = (strlen(callsign) + 9) * 2;		/* ??? */
+
+	*p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
+	*p++ = ROSE_ADDR_LEN * 2;
+	memcpy(p, &rose->dest_addr, ROSE_ADDR_LEN);
+	p   += ROSE_ADDR_LEN;
+
+	memcpy(p, callsign, strlen(callsign));
+	p   += strlen(callsign);
+	
+	*p++ = FAC_CCITT_SRC_NSAP;
+
+	callsign = ax2asc(&rose->source_call);
+
+	*p++ = strlen(callsign) + 10;
+	*p++ = (strlen(callsign) + 9) * 2;		/* ??? */
+
+	*p++ = 0x47; *p++ = 0x00; *p++ = 0x11;
+	*p++ = ROSE_ADDR_LEN * 2;
+	memcpy(p, &rose->source_addr, ROSE_ADDR_LEN);
+	p   += ROSE_ADDR_LEN;
+
+	memcpy(p, callsign, strlen(callsign));
+	p   += strlen(callsign);
+
+	len       = p - buffer;
+	buffer[0] = len - 1;
+	
+	return len;
+}
+
+#endif