115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
|
|
* Generic HDLC support routines for Linux
|
|
* HDLC support
|
|
*
|
|
* Copyright (C) 1999 - 2006 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/errno.h>
|
|
#include <linux/hdlc.h>
|
|
#include <linux/if_arp.h>
|
|
#include <linux/inetdevice.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pkt_sched.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/skbuff.h>
|
|
|
|
|
|
static int raw_ioctl(struct net_device *dev, struct ifreq *ifr);
|
|
|
|
static __be16 raw_type_trans(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
return cpu_to_be16(ETH_P_IP);
|
|
}
|
|
|
|
static struct hdlc_proto proto = {
|
|
.type_trans = raw_type_trans,
|
|
.ioctl = raw_ioctl,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
|
|
static int raw_ioctl(struct net_device *dev, struct ifreq *ifr)
|
|
{
|
|
raw_hdlc_proto __user *raw_s = ifr->ifr_settings.ifs_ifsu.raw_hdlc;
|
|
const size_t size = sizeof(raw_hdlc_proto);
|
|
raw_hdlc_proto new_settings;
|
|
hdlc_device *hdlc = dev_to_hdlc(dev);
|
|
int result;
|
|
|
|
switch (ifr->ifr_settings.type) {
|
|
case IF_GET_PROTO:
|
|
if (dev_to_hdlc(dev)->proto != &proto)
|
|
return -EINVAL;
|
|
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, 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(dev, new_settings.encoding,
|
|
new_settings.parity);
|
|
if (result)
|
|
return result;
|
|
|
|
result = attach_hdlc_protocol(dev, &proto,
|
|
sizeof(raw_hdlc_proto));
|
|
if (result)
|
|
return result;
|
|
memcpy(hdlc->state, &new_settings, size);
|
|
dev->type = ARPHRD_RAWHDLC;
|
|
netif_dormant_off(dev);
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static int __init mod_init(void)
|
|
{
|
|
register_hdlc_protocol(&proto);
|
|
return 0;
|
|
}
|
|
|
|
|
|
|
|
static void __exit mod_exit(void)
|
|
{
|
|
unregister_hdlc_protocol(&proto);
|
|
}
|
|
|
|
|
|
module_init(mod_init);
|
|
module_exit(mod_exit);
|
|
|
|
MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
|
|
MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
|
|
MODULE_LICENSE("GPL v2");
|