/* * Generic HDLC support routines for Linux * X.25 support * * Copyright (C) 1999 - 2001 Krzysztof Halasa <khc@pm.waw.pl> * * This program 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/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>/* These functions are callbacks called by LAPB layer */static void x25_connect_disconnect(void *token, int reason, int code){	hdlc_device *hdlc = token;	struct sk_buff *skb;	unsigned char *ptr;	if ((skb = dev_alloc_skb(1)) == NULL) {		printk(KERN_ERR "%s: out of memory\n", hdlc_to_name(hdlc));		return;	}	ptr = skb_put(skb, 1);	*ptr = code;	skb->dev = hdlc_to_dev(hdlc);	skb->protocol = htons(ETH_P_X25);	skb->mac.raw = skb->data;	skb->pkt_type = PACKET_HOST;	netif_rx(skb);}static void x25_connected(void *token, int reason){	x25_connect_disconnect(token, reason, 1);}static void x25_disconnected(void *token, int reason){	x25_connect_disconnect(token, reason, 2);}static int x25_data_indication(void *token, struct sk_buff *skb){	hdlc_device *hdlc = token;	unsigned char *ptr;	ptr = skb_push(skb, 1);	*ptr = 0;	skb->dev = hdlc_to_dev(hdlc);	skb->protocol = htons(ETH_P_X25);	skb->mac.raw = skb->data;	skb->pkt_type = PACKET_HOST;	return netif_rx(skb);}static void x25_data_transmit(void *token, struct sk_buff *skb){	hdlc_device *hdlc = token;	hdlc->xmit(skb, hdlc_to_dev(hdlc)); /* Ignore return value :-( */}static int x25_xmit(struct sk_buff *skb, struct net_device *dev){	hdlc_device *hdlc = dev_to_hdlc(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(hdlc, skb)) != LAPB_OK)			dev_kfree_skb(skb);		return 0;	case 1:		if ((result = lapb_connect_request(hdlc))!= LAPB_OK) {			if (result == LAPB_CONNECTED)				/* Send connect confirm. msg to level 3 */				x25_connected(hdlc, 0);			else				printk(KERN_ERR "%s: LAPB connect request "				       "failed, error code = %i\n",				       hdlc_to_name(hdlc), result);		}		break;	case 2:		if ((result = lapb_disconnect_request(hdlc)) != LAPB_OK) {			if (result == LAPB_NOTCONNECTED)				/* Send disconnect confirm. msg to level 3 */				x25_disconnected(hdlc, 0);			else				printk(KERN_ERR "%s: LAPB disconnect request "				       "failed, error code = %i\n",				       hdlc_to_name(hdlc), result);		}		break;	default:		/* to be defined */		break;	}	dev_kfree_skb(skb);	return 0;}static int x25_open(hdlc_device *hdlc){	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(hdlc, &cb);	if (result != LAPB_OK)		return result;	return 0;}static void x25_close(hdlc_device *hdlc){	lapb_unregister(hdlc);}static void x25_rx(struct sk_buff *skb){	hdlc_device *hdlc = dev_to_hdlc(skb->dev);	if (lapb_data_received(hdlc, skb) == LAPB_OK)		return;	hdlc->stats.rx_errors++;	dev_kfree_skb_any(skb);}int hdlc_x25_ioctl(hdlc_device *hdlc, struct ifreq *ifr){	struct net_device *dev = hdlc_to_dev(hdlc);	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(hdlc, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);		if (result)			return result;		hdlc_proto_detach(hdlc);		hdlc->open = x25_open;		hdlc->stop = x25_close;		hdlc->netif_rx = x25_rx;		hdlc->proto = 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;}