136 lines
3.2 KiB
C
136 lines
3.2 KiB
C
/*
|
|
* Generic HDLC support routines for Linux
|
|
* HDLC Ethernet emulation support
|
|
*
|
|
* Copyright (C) 2002-2006 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/etherdevice.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>
|
|
#include <linux/slab.h>
|
|
|
|
static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr);
|
|
|
|
static int eth_tx(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
int pad = ETH_ZLEN - skb->len;
|
|
if (pad > 0) { /* Pad the frame with zeros */
|
|
int len = skb->len;
|
|
if (skb_tailroom(skb) < pad)
|
|
if (pskb_expand_head(skb, 0, pad, GFP_ATOMIC)) {
|
|
dev->stats.tx_dropped++;
|
|
dev_kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
skb_put(skb, pad);
|
|
memset(skb->data + len, 0, pad);
|
|
}
|
|
return dev_to_hdlc(dev)->xmit(skb, dev);
|
|
}
|
|
|
|
|
|
static struct hdlc_proto proto = {
|
|
.type_trans = eth_type_trans,
|
|
.ioctl = raw_eth_ioctl,
|
|
.module = THIS_MODULE,
|
|
};
|
|
|
|
|
|
static int raw_eth_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;
|
|
int (*old_ch_mtu)(struct net_device *, int);
|
|
int old_qlen;
|
|
|
|
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_ETH;
|
|
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_ETH:
|
|
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->hard_start_xmit = eth_tx;
|
|
old_ch_mtu = dev->change_mtu;
|
|
old_qlen = dev->tx_queue_len;
|
|
ether_setup(dev);
|
|
dev->change_mtu = old_ch_mtu;
|
|
dev->tx_queue_len = old_qlen;
|
|
random_ether_addr(dev->dev_addr);
|
|
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("Ethernet encapsulation support for generic HDLC");
|
|
MODULE_LICENSE("GPL v2");
|