linux/drivers/net/wan/hdlc_raw.c
Arnd Bergmann ad7eab2ab0 net: split out ndo_siowandev ioctl
In order to further reduce the scope of ndo_do_ioctl(), move
out the SIOCWANDEV handling into a new network device operation
function.

Adjust the prototype to only pass the if_settings sub-structure
in place of the ifreq, and remove the redundant 'cmd' argument
in the process.

Cc: Krzysztof Halasa <khc@pm.waw.pl>
Cc: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Cc: Kevin Curtis <kevin.curtis@farsite.co.uk>
Cc: Zhao Qiang <qiang.zhao@nxp.com>
Cc: Martin Schiller <ms@dev.tdt.de>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: linux-x25@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-07-27 20:11:45 +01:00

113 lines
2.4 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 if_settings *ifs);
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 if_settings *ifs)
{
raw_hdlc_proto __user *raw_s = ifs->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 (ifs->type) {
case IF_GET_PROTO:
if (dev_to_hdlc(dev)->proto != &proto)
return -EINVAL;
ifs->type = IF_PROTO_HDLC;
if (ifs->size < size) {
ifs->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 hdlc_raw_init(void)
{
register_hdlc_protocol(&proto);
return 0;
}
static void __exit hdlc_raw_exit(void)
{
unregister_hdlc_protocol(&proto);
}
module_init(hdlc_raw_init);
module_exit(hdlc_raw_exit);
MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
MODULE_DESCRIPTION("Raw HDLC protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");