linux/drivers/net/wan/hdlc_raw.c
Thomas Gleixner 25763b3c86 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 206
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 107 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528171438.615055994@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:29:53 -07:00

113 lines
2.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic HDLC support routines for Linux
* HDLC support
*
* Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
*/
#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;
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
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");