[mirror_ubuntu-artful-kernel.git] / net / ax25 / ax25_iface.c

/*
 * 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.
 *
 * 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/sched.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>

static struct protocol_struct {
	struct protocol_struct *next;
	unsigned int pid;
	int (*func)(struct sk_buff *, ax25_cb *);
} *protocol_list = NULL;
static DEFINE_RWLOCK(protocol_list_lock);

static struct linkfail_struct {
	struct linkfail_struct *next;
	void (*func)(ax25_cb *, int);
} *linkfail_list = NULL;
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);

int ax25_protocol_register(unsigned int pid,
	int (*func)(struct sk_buff *, ax25_cb *))
{
	struct protocol_struct *protocol;

	if (pid == AX25_P_TEXT || pid == AX25_P_SEGMENT)
		return 0;
#ifdef CONFIG_INET
	if (pid == AX25_P_IP || pid == AX25_P_ARP)
		return 0;
#endif
	if ((protocol = kmalloc(sizeof(*protocol), GFP_ATOMIC)) == NULL)
		return 0;

	protocol->pid  = pid;
	protocol->func = func;

	write_lock(&protocol_list_lock);
	protocol->next = protocol_list;
	protocol_list  = protocol;
	write_unlock(&protocol_list_lock);

	return 1;
}

EXPORT_SYMBOL(ax25_protocol_register);

void ax25_protocol_release(unsigned int pid)
{
	struct protocol_struct *s, *protocol;

	write_lock(&protocol_list_lock);
	protocol = protocol_list;
	if (protocol == NULL) {
		write_unlock(&protocol_list_lock);
		return;
	}

	if (protocol->pid == pid) {
		protocol_list = protocol->next;
		write_unlock(&protocol_list_lock);
		kfree(protocol);
		return;
	}

	while (protocol != NULL && protocol->next != NULL) {
		if (protocol->next->pid == pid) {
			s = protocol->next;
			protocol->next = protocol->next->next;
			write_unlock(&protocol_list_lock);
			kfree(s);
			return;
		}

		protocol = protocol->next;
	}
	write_unlock(&protocol_list_lock);
}

EXPORT_SYMBOL(ax25_protocol_release);

int ax25_linkfail_register(void (*func)(ax25_cb *, int))
{
	struct linkfail_struct *linkfail;

	if ((linkfail = kmalloc(sizeof(*linkfail), GFP_ATOMIC)) == NULL)
		return 0;

	linkfail->func = func;

	spin_lock_bh(&linkfail_lock);
	linkfail->next = linkfail_list;
	linkfail_list  = linkfail;
	spin_unlock_bh(&linkfail_lock);

	return 1;
}

EXPORT_SYMBOL(ax25_linkfail_register);

void ax25_linkfail_release(void (*func)(ax25_cb *, int))
{
	struct linkfail_struct *s, *linkfail;

	spin_lock_bh(&linkfail_lock);
	linkfail = linkfail_list;
	if (linkfail == NULL) {
		spin_unlock_bh(&linkfail_lock);
		return;
	}

	if (linkfail->func == func) {
		linkfail_list = linkfail->next;
		spin_unlock_bh(&linkfail_lock);
		kfree(linkfail);
		return;
	}

	while (linkfail != NULL && linkfail->next != NULL) {
		if (linkfail->next->func == func) {
			s = linkfail->next;
			linkfail->next = linkfail->next->next;
			spin_unlock_bh(&linkfail_lock);
			kfree(s);
			return;
		}

		linkfail = linkfail->next;
	}
	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 0;

	listen->callsign = *callsign;
	listen->dev      = dev;

	spin_lock_bh(&listen_lock);
	listen->next = listen_list;
	listen_list  = listen;
	spin_unlock_bh(&listen_lock);

	return 1;
}

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 protocol_struct *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 linkfail_struct *linkfail;

	spin_lock_bh(&linkfail_lock);
	for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next)
		(linkfail->func)(ax25, reason);
	spin_unlock_bh(&linkfail_lock);
}

int ax25_protocol_is_registered(unsigned int pid)
{
	struct protocol_struct *protocol;
	int res = 0;

	read_lock(&protocol_list_lock);
	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
		if (protocol->pid == pid) {
			res = 1;
			break;
		}
	read_unlock(&protocol_list_lock);

	return res;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*
	7	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	8	*/
1da177e4 LT	9	#include <linux/errno.h>
	10	#include <linux/types.h>
	11	#include <linux/socket.h>
	12	#include <linux/in.h>
	13	#include <linux/kernel.h>
70868eac	14	#include <linux/module.h>
1da177e4 LT	15	#include <linux/sched.h>
	16	#include <linux/spinlock.h>
	17	#include <linux/timer.h>
	18	#include <linux/string.h>
	19	#include <linux/sockios.h>
	20	#include <linux/net.h>
	21	#include <net/ax25.h>
	22	#include <linux/inet.h>
	23	#include <linux/netdevice.h>
	24	#include <linux/skbuff.h>
	25	#include <net/sock.h>
	26	#include <asm/uaccess.h>
	27	#include <asm/system.h>
	28	#include <linux/fcntl.h>
	29	#include <linux/mm.h>
	30	#include <linux/interrupt.h>
	31
	32	static struct protocol_struct {
	33	struct protocol_struct *next;
	34	unsigned int pid;
	35	int (func)(struct sk_buff , ax25_cb *);
	36	} *protocol_list = NULL;
	37	static DEFINE_RWLOCK(protocol_list_lock);
	38
	39	static struct linkfail_struct {
	40	struct linkfail_struct *next;
	41	void (func)(ax25_cb , int);
	42	} *linkfail_list = NULL;
	43	static DEFINE_SPINLOCK(linkfail_lock);
	44
	45	static struct listen_struct {
	46	struct listen_struct *next;
	47	ax25_address callsign;
	48	struct net_device *dev;
	49	} *listen_list = NULL;
	50	static DEFINE_SPINLOCK(listen_lock);
	51
	52	int ax25_protocol_register(unsigned int pid,
	53	int (func)(struct sk_buff , ax25_cb *))
	54	{
	55	struct protocol_struct *protocol;
	56
	57	if (pid == AX25_P_TEXT \|\| pid == AX25_P_SEGMENT)
	58	return 0;
	59	#ifdef CONFIG_INET
	60	if (pid == AX25_P_IP \|\| pid == AX25_P_ARP)
	61	return 0;
	62	#endif
	63	if ((protocol = kmalloc(sizeof(*protocol), GFP_ATOMIC)) == NULL)
	64	return 0;
	65
	66	protocol->pid = pid;
	67	protocol->func = func;
	68
	69	write_lock(&protocol_list_lock);
	70	protocol->next = protocol_list;
	71	protocol_list = protocol;
	72	write_unlock(&protocol_list_lock);
	73
	74	return 1;
	75	}
	76
70868eac RB	77	EXPORT_SYMBOL(ax25_protocol_register);
70868eac RB	78
1da177e4 LT	79	void ax25_protocol_release(unsigned int pid)
	80	{
	81	struct protocol_struct s, protocol;
	82
	83	write_lock(&protocol_list_lock);
	84	protocol = protocol_list;
	85	if (protocol == NULL) {
	86	write_unlock(&protocol_list_lock);
	87	return;
	88	}
	89
	90	if (protocol->pid == pid) {
	91	protocol_list = protocol->next;
	92	write_unlock(&protocol_list_lock);
	93	kfree(protocol);
	94	return;
	95	}
	96
	97	while (protocol != NULL && protocol->next != NULL) {
	98	if (protocol->next->pid == pid) {
	99	s = protocol->next;
	100	protocol->next = protocol->next->next;
	101	write_unlock(&protocol_list_lock);
	102	kfree(s);
	103	return;
	104	}
	105
	106	protocol = protocol->next;
	107	}
	108	write_unlock(&protocol_list_lock);
	109	}
	110
70868eac RB	111	EXPORT_SYMBOL(ax25_protocol_release);
70868eac RB	112
1da177e4 LT	113	int ax25_linkfail_register(void (func)(ax25_cb , int))
	114	{
	115	struct linkfail_struct *linkfail;
	116
	117	if ((linkfail = kmalloc(sizeof(*linkfail), GFP_ATOMIC)) == NULL)
	118	return 0;
	119
	120	linkfail->func = func;
	121
	122	spin_lock_bh(&linkfail_lock);
	123	linkfail->next = linkfail_list;
	124	linkfail_list = linkfail;
	125	spin_unlock_bh(&linkfail_lock);
	126
	127	return 1;
	128	}
	129
70868eac RB	130	EXPORT_SYMBOL(ax25_linkfail_register);
70868eac RB	131
1da177e4 LT	132	void ax25_linkfail_release(void (func)(ax25_cb , int))
	133	{
	134	struct linkfail_struct s, linkfail;
	135
	136	spin_lock_bh(&linkfail_lock);
	137	linkfail = linkfail_list;
	138	if (linkfail == NULL) {
	139	spin_unlock_bh(&linkfail_lock);
	140	return;
	141	}
	142
	143	if (linkfail->func == func) {
	144	linkfail_list = linkfail->next;
	145	spin_unlock_bh(&linkfail_lock);
	146	kfree(linkfail);
	147	return;
	148	}
	149
	150	while (linkfail != NULL && linkfail->next != NULL) {
	151	if (linkfail->next->func == func) {
	152	s = linkfail->next;
	153	linkfail->next = linkfail->next->next;
	154	spin_unlock_bh(&linkfail_lock);
	155	kfree(s);
	156	return;
	157	}
	158
	159	linkfail = linkfail->next;
	160	}
	161	spin_unlock_bh(&linkfail_lock);
	162	}
	163
70868eac RB	164	EXPORT_SYMBOL(ax25_linkfail_release);
70868eac RB	165
1da177e4 LT	166	int ax25_listen_register(ax25_address callsign, struct net_device dev)
	167	{
	168	struct listen_struct *listen;
	169
	170	if (ax25_listen_mine(callsign, dev))
	171	return 0;
	172
	173	if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
	174	return 0;
	175
	176	listen->callsign = *callsign;
	177	listen->dev = dev;
	178
	179	spin_lock_bh(&listen_lock);
	180	listen->next = listen_list;
	181	listen_list = listen;
	182	spin_unlock_bh(&listen_lock);
	183
	184	return 1;
	185	}
	186
70868eac RB	187	EXPORT_SYMBOL(ax25_listen_register);
70868eac RB	188
1da177e4 LT	189	void ax25_listen_release(ax25_address callsign, struct net_device dev)
	190	{
	191	struct listen_struct s, listen;
	192
	193	spin_lock_bh(&listen_lock);
	194	listen = listen_list;
	195	if (listen == NULL) {
	196	spin_unlock_bh(&listen_lock);
	197	return;
	198	}
	199
	200	if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
	201	listen_list = listen->next;
	202	spin_unlock_bh(&listen_lock);
	203	kfree(listen);
	204	return;
	205	}
	206
	207	while (listen != NULL && listen->next != NULL) {
	208	if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
	209	s = listen->next;
	210	listen->next = listen->next->next;
	211	spin_unlock_bh(&listen_lock);
	212	kfree(s);
	213	return;
	214	}
	215
	216	listen = listen->next;
	217	}
	218	spin_unlock_bh(&listen_lock);
	219	}
	220
70868eac RB	221	EXPORT_SYMBOL(ax25_listen_release);
70868eac RB	222
1da177e4 LT	223	int (ax25_protocol_function(unsigned int pid))(struct sk_buff , ax25_cb *)
	224	{
	225	int (res)(struct sk_buff , ax25_cb *) = NULL;
	226	struct protocol_struct *protocol;
	227
	228	read_lock(&protocol_list_lock);
	229	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
	230	if (protocol->pid == pid) {
	231	res = protocol->func;
	232	break;
	233	}
	234	read_unlock(&protocol_list_lock);
	235
	236	return res;
	237	}
	238
	239	int ax25_listen_mine(ax25_address callsign, struct net_device dev)
	240	{
	241	struct listen_struct *listen;
	242
	243	spin_lock_bh(&listen_lock);
	244	for (listen = listen_list; listen != NULL; listen = listen->next)
	245	if (ax25cmp(&listen->callsign, callsign) == 0 && (listen->dev == dev \|\| listen->dev == NULL)) {
	246	spin_unlock_bh(&listen_lock);
	247	return 1;
	248	}
	249	spin_unlock_bh(&listen_lock);
	250
	251	return 0;
	252	}
	253
	254	void ax25_link_failed(ax25_cb *ax25, int reason)
	255	{
	256	struct linkfail_struct *linkfail;
	257
	258	spin_lock_bh(&linkfail_lock);
	259	for (linkfail = linkfail_list; linkfail != NULL; linkfail = linkfail->next)
	260	(linkfail->func)(ax25, reason);
	261	spin_unlock_bh(&linkfail_lock);
	262	}
	263
	264	int ax25_protocol_is_registered(unsigned int pid)
	265	{
	266	struct protocol_struct *protocol;
	267	int res = 0;
	268
	269	read_lock(&protocol_list_lock);
	270	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
	271	if (protocol->pid == pid) {
	272	res = 1;
	273	break;
	274	}
	275	read_unlock(&protocol_list_lock);
	276
	277	return res;
	278	}