linux/net/ax25/ax25_dev.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

198 lines
4.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
*/
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/spinlock.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/init.h>
ax25_dev *ax25_dev_list;
DEFINE_SPINLOCK(ax25_dev_lock);
ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
{
ax25_dev *ax25_dev, *res = NULL;
spin_lock_bh(&ax25_dev_lock);
for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) {
res = ax25_dev;
}
spin_unlock_bh(&ax25_dev_lock);
return res;
}
/*
* This is called when an interface is brought up. These are
* reasonable defaults.
*/
void ax25_dev_device_up(struct net_device *dev)
{
ax25_dev *ax25_dev;
if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
return;
}
dev->ax25_ptr = ax25_dev;
ax25_dev->dev = dev;
dev_hold(dev);
ax25_dev->forward = NULL;
ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
ax25_dev->values[AX25_VALUES_BACKOFF] = AX25_DEF_BACKOFF;
ax25_dev->values[AX25_VALUES_CONMODE] = AX25_DEF_CONMODE;
ax25_dev->values[AX25_VALUES_WINDOW] = AX25_DEF_WINDOW;
ax25_dev->values[AX25_VALUES_EWINDOW] = AX25_DEF_EWINDOW;
ax25_dev->values[AX25_VALUES_T1] = AX25_DEF_T1;
ax25_dev->values[AX25_VALUES_T2] = AX25_DEF_T2;
ax25_dev->values[AX25_VALUES_T3] = AX25_DEF_T3;
ax25_dev->values[AX25_VALUES_IDLE] = AX25_DEF_IDLE;
ax25_dev->values[AX25_VALUES_N2] = AX25_DEF_N2;
ax25_dev->values[AX25_VALUES_PACLEN] = AX25_DEF_PACLEN;
ax25_dev->values[AX25_VALUES_PROTOCOL] = AX25_DEF_PROTOCOL;
ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
ax25_ds_setup_timer(ax25_dev);
#endif
spin_lock_bh(&ax25_dev_lock);
ax25_dev->next = ax25_dev_list;
ax25_dev_list = ax25_dev;
spin_unlock_bh(&ax25_dev_lock);
ax25_register_dev_sysctl(ax25_dev);
}
void ax25_dev_device_down(struct net_device *dev)
{
ax25_dev *s, *ax25_dev;
if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
return;
ax25_unregister_dev_sysctl(ax25_dev);
spin_lock_bh(&ax25_dev_lock);
#ifdef CONFIG_AX25_DAMA_SLAVE
ax25_ds_del_timer(ax25_dev);
#endif
/*
* Remove any packet forwarding that points to this device.
*/
for (s = ax25_dev_list; s != NULL; s = s->next)
if (s->forward == dev)
s->forward = NULL;
if ((s = ax25_dev_list) == ax25_dev) {
ax25_dev_list = s->next;
spin_unlock_bh(&ax25_dev_lock);
dev->ax25_ptr = NULL;
dev_put(dev);
kfree(ax25_dev);
return;
}
while (s != NULL && s->next != NULL) {
if (s->next == ax25_dev) {
s->next = ax25_dev->next;
spin_unlock_bh(&ax25_dev_lock);
dev->ax25_ptr = NULL;
dev_put(dev);
kfree(ax25_dev);
return;
}
s = s->next;
}
spin_unlock_bh(&ax25_dev_lock);
dev->ax25_ptr = NULL;
}
int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
{
ax25_dev *ax25_dev, *fwd_dev;
if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
return -EINVAL;
switch (cmd) {
case SIOCAX25ADDFWD:
if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
return -EINVAL;
if (ax25_dev->forward != NULL)
return -EINVAL;
ax25_dev->forward = fwd_dev->dev;
break;
case SIOCAX25DELFWD:
if (ax25_dev->forward == NULL)
return -EINVAL;
ax25_dev->forward = NULL;
break;
default:
return -EINVAL;
}
return 0;
}
struct net_device *ax25_fwd_dev(struct net_device *dev)
{
ax25_dev *ax25_dev;
if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
return dev;
if (ax25_dev->forward == NULL)
return dev;
return ax25_dev->forward;
}
/*
* Free all memory associated with device structures.
*/
void __exit ax25_dev_free(void)
{
ax25_dev *s, *ax25_dev;
spin_lock_bh(&ax25_dev_lock);
ax25_dev = ax25_dev_list;
while (ax25_dev != NULL) {
s = ax25_dev;
dev_put(ax25_dev->dev);
ax25_dev = ax25_dev->next;
kfree(s);
}
ax25_dev_list = NULL;
spin_unlock_bh(&ax25_dev_lock);
}