linux-stable/net/ax25/ax25_iface.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

214 lines
4.7 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/in.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.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>
static struct ax25_protocol *protocol_list;
static DEFINE_RWLOCK(protocol_list_lock);
static HLIST_HEAD(ax25_linkfail_list);
static DEFINE_SPINLOCK(linkfail_lock);
static struct listen_struct {
struct listen_struct *next;
ax25_address callsign;
struct net_device *dev;
} *listen_list = NULL;
static DEFINE_SPINLOCK(listen_lock);
/*
* Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
* AX25_P_IP or AX25_P_ARP ...
*/
void ax25_register_pid(struct ax25_protocol *ap)
{
write_lock_bh(&protocol_list_lock);
ap->next = protocol_list;
protocol_list = ap;
write_unlock_bh(&protocol_list_lock);
}
EXPORT_SYMBOL_GPL(ax25_register_pid);
void ax25_protocol_release(unsigned int pid)
{
struct ax25_protocol *protocol;
write_lock_bh(&protocol_list_lock);
protocol = protocol_list;
if (protocol == NULL)
goto out;
if (protocol->pid == pid) {
protocol_list = protocol->next;
goto out;
}
while (protocol != NULL && protocol->next != NULL) {
if (protocol->next->pid == pid) {
protocol->next = protocol->next->next;
goto out;
}
protocol = protocol->next;
}
out:
write_unlock_bh(&protocol_list_lock);
}
EXPORT_SYMBOL(ax25_protocol_release);
void ax25_linkfail_register(struct ax25_linkfail *lf)
{
spin_lock_bh(&linkfail_lock);
hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
spin_unlock_bh(&linkfail_lock);
}
EXPORT_SYMBOL(ax25_linkfail_register);
void ax25_linkfail_release(struct ax25_linkfail *lf)
{
spin_lock_bh(&linkfail_lock);
hlist_del_init(&lf->lf_node);
spin_unlock_bh(&linkfail_lock);
}
EXPORT_SYMBOL(ax25_linkfail_release);
int ax25_listen_register(ax25_address *callsign, struct net_device *dev)
{
struct listen_struct *listen;
if (ax25_listen_mine(callsign, dev))
return 0;
if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
return -ENOMEM;
listen->callsign = *callsign;
listen->dev = dev;
spin_lock_bh(&listen_lock);
listen->next = listen_list;
listen_list = listen;
spin_unlock_bh(&listen_lock);
return 0;
}
EXPORT_SYMBOL(ax25_listen_register);
void ax25_listen_release(ax25_address *callsign, struct net_device *dev)
{
struct listen_struct *s, *listen;
spin_lock_bh(&listen_lock);
listen = listen_list;
if (listen == NULL) {
spin_unlock_bh(&listen_lock);
return;
}
if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
listen_list = listen->next;
spin_unlock_bh(&listen_lock);
kfree(listen);
return;
}
while (listen != NULL && listen->next != NULL) {
if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
s = listen->next;
listen->next = listen->next->next;
spin_unlock_bh(&listen_lock);
kfree(s);
return;
}
listen = listen->next;
}
spin_unlock_bh(&listen_lock);
}
EXPORT_SYMBOL(ax25_listen_release);
int (*ax25_protocol_function(unsigned int pid))(struct sk_buff *, ax25_cb *)
{
int (*res)(struct sk_buff *, ax25_cb *) = NULL;
struct ax25_protocol *protocol;
read_lock(&protocol_list_lock);
for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
if (protocol->pid == pid) {
res = protocol->func;
break;
}
read_unlock(&protocol_list_lock);
return res;
}
int ax25_listen_mine(ax25_address *callsign, struct net_device *dev)
{
struct listen_struct *listen;
spin_lock_bh(&listen_lock);
for (listen = listen_list; listen != NULL; listen = listen->next)
if (ax25cmp(&listen->callsign, callsign) == 0 &&
(listen->dev == dev || listen->dev == NULL)) {
spin_unlock_bh(&listen_lock);
return 1;
}
spin_unlock_bh(&listen_lock);
return 0;
}
void ax25_link_failed(ax25_cb *ax25, int reason)
{
struct ax25_linkfail *lf;
spin_lock_bh(&linkfail_lock);
hlist_for_each_entry(lf, &ax25_linkfail_list, lf_node)
lf->func(ax25, reason);
spin_unlock_bh(&linkfail_lock);
}
int ax25_protocol_is_registered(unsigned int pid)
{
struct ax25_protocol *protocol;
int res = 0;
read_lock_bh(&protocol_list_lock);
for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
if (protocol->pid == pid) {
res = 1;
break;
}
read_unlock_bh(&protocol_list_lock);
return res;
}