/* * Generic HDLC support routines for Linux * HDLC support * * Copyright (C) 1999 - 2003 Krzysztof Halasa <khc@pm.waw.pl> * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License * as published by the Free Software Foundation. */#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>static unsigned short raw_type_trans(struct sk_buff *skb,				     struct net_device *dev){	return __constant_htons(ETH_P_IP);}int hdlc_raw_ioctl(hdlc_device *hdlc, struct ifreq *ifr){	raw_hdlc_proto *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;	const size_t size = sizeof(raw_hdlc_proto);	raw_hdlc_proto new_settings;	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_HDLC;		if (ifr->ifr_settings.size < size) {			ifr->ifr_settings.size = size; /* data size wanted */			return -ENOBUFS;		}		if (copy_to_user(raw_s, &hdlc->state.raw_hdlc.settings, size))			return -EFAULT;		return 0;	case IF_PROTO_HDLC:		if (!capable(CAP_NET_ADMIN))			return -EPERM;		if (dev->flags & IFF_UP)			return -EBUSY;		if (copy_from_user(&new_settings, raw_s, size))			return -EFAULT;		if (new_settings.encoding == ENCODING_DEFAULT)			new_settings.encoding = ENCODING_NRZ;		if (new_settings.parity == PARITY_DEFAULT)			new_settings.parity = PARITY_CRC16_PR1_CCITT;		result = hdlc->attach(hdlc, new_settings.encoding,				      new_settings.parity);		if (result)			return result;		hdlc_proto_detach(hdlc);		memcpy(&hdlc->state.raw_hdlc.settings, &new_settings, size);		hdlc->open = NULL;		hdlc->stop = NULL;		hdlc->netif_rx = NULL;		hdlc->type_trans = raw_type_trans;		hdlc->proto = IF_PROTO_HDLC;		dev->hard_start_xmit = hdlc->xmit;		dev->hard_header = NULL;		dev->type = ARPHRD_RAWHDLC;		dev->flags = IFF_POINTOPOINT | IFF_NOARP;		dev->addr_len = 0;		return 0;	}	return -EINVAL;}