[linux-2.6-block.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/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 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 *s, *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) {
			s = protocol->next;
			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;
	struct hlist_node *node;

	spin_lock_bh(&linkfail_lock);
	hlist_for_each_entry(lf, node, &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;
}
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/spinlock.h>
	16	#include <linux/timer.h>
	17	#include <linux/string.h>
	18	#include <linux/sockios.h>
	19	#include <linux/net.h>
	20	#include <net/ax25.h>
	21	#include <linux/inet.h>
	22	#include <linux/netdevice.h>
	23	#include <linux/skbuff.h>
	24	#include <net/sock.h>
	25	#include <asm/uaccess.h>
	26	#include <asm/system.h>
	27	#include <linux/fcntl.h>
	28	#include <linux/mm.h>
	29	#include <linux/interrupt.h>
	30
8d5cf596	31	static struct ax25_protocol *protocol_list;
1da177e4 LT	32	static DEFINE_RWLOCK(protocol_list_lock);
1da177e4 LT	33
a4282717	34	static HLIST_HEAD(ax25_linkfail_list);
1da177e4 LT	35	static DEFINE_SPINLOCK(linkfail_lock);
	36
	37	static struct listen_struct {
	38	struct listen_struct *next;
	39	ax25_address callsign;
	40	struct net_device *dev;
	41	} *listen_list = NULL;
	42	static DEFINE_SPINLOCK(listen_lock);
	43
8d5cf596 RB	44	/*
	45	* Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
	46	* AX25_P_IP or AX25_P_ARP ...
	47	*/
	48	void ax25_register_pid(struct ax25_protocol *ap)
1da177e4	49	{
95ff9f4d	50	write_lock_bh(&protocol_list_lock);
8d5cf596 RB	51	ap->next = protocol_list;
8d5cf596 RB	52	protocol_list = ap;
95ff9f4d	53	write_unlock_bh(&protocol_list_lock);
1da177e4 LT	54	}
1da177e4 LT	55
8d5cf596	56	EXPORT_SYMBOL_GPL(ax25_register_pid);
70868eac	57
1da177e4 LT	58	void ax25_protocol_release(unsigned int pid)
1da177e4 LT	59	{
8d5cf596	60	struct ax25_protocol s, protocol;
1da177e4	61
95ff9f4d	62	write_lock_bh(&protocol_list_lock);
1da177e4	63	protocol = protocol_list;
910d30b7 IJ	64	if (protocol == NULL)
910d30b7 IJ	65	goto out;
1da177e4 LT	66
	67	if (protocol->pid == pid) {
	68	protocol_list = protocol->next;
910d30b7	69	goto out;
1da177e4 LT	70	}
	71
	72	while (protocol != NULL && protocol->next != NULL) {
	73	if (protocol->next->pid == pid) {
	74	s = protocol->next;
	75	protocol->next = protocol->next->next;
910d30b7	76	goto out;
1da177e4 LT	77	}
	78
	79	protocol = protocol->next;
	80	}
910d30b7	81	out:
95ff9f4d	82	write_unlock_bh(&protocol_list_lock);
1da177e4 LT	83	}
1da177e4 LT	84
70868eac RB	85	EXPORT_SYMBOL(ax25_protocol_release);
70868eac RB	86
a4282717	87	void ax25_linkfail_register(struct ax25_linkfail *lf)
1da177e4	88	{
1da177e4	89	spin_lock_bh(&linkfail_lock);
a4282717	90	hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
1da177e4	91	spin_unlock_bh(&linkfail_lock);
1da177e4 LT	92	}
1da177e4 LT	93
70868eac RB	94	EXPORT_SYMBOL(ax25_linkfail_register);
70868eac RB	95
a4282717	96	void ax25_linkfail_release(struct ax25_linkfail *lf)
1da177e4	97	{
1da177e4	98	spin_lock_bh(&linkfail_lock);
a4282717	99	hlist_del_init(&lf->lf_node);
1da177e4 LT	100	spin_unlock_bh(&linkfail_lock);
	101	}
	102
70868eac RB	103	EXPORT_SYMBOL(ax25_linkfail_release);
70868eac RB	104
1da177e4 LT	105	int ax25_listen_register(ax25_address callsign, struct net_device dev)
	106	{
	107	struct listen_struct *listen;
	108
	109	if (ax25_listen_mine(callsign, dev))
	110	return 0;
	111
	112	if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
81dcd169	113	return -ENOMEM;
1da177e4 LT	114
	115	listen->callsign = *callsign;
	116	listen->dev = dev;
	117
	118	spin_lock_bh(&listen_lock);
	119	listen->next = listen_list;
	120	listen_list = listen;
	121	spin_unlock_bh(&listen_lock);
	122
81dcd169	123	return 0;
1da177e4 LT	124	}
1da177e4 LT	125
70868eac RB	126	EXPORT_SYMBOL(ax25_listen_register);
70868eac RB	127
1da177e4 LT	128	void ax25_listen_release(ax25_address callsign, struct net_device dev)
	129	{
	130	struct listen_struct s, listen;
	131
	132	spin_lock_bh(&listen_lock);
	133	listen = listen_list;
	134	if (listen == NULL) {
	135	spin_unlock_bh(&listen_lock);
	136	return;
	137	}
	138
	139	if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
	140	listen_list = listen->next;
	141	spin_unlock_bh(&listen_lock);
	142	kfree(listen);
	143	return;
	144	}
	145
	146	while (listen != NULL && listen->next != NULL) {
	147	if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
	148	s = listen->next;
	149	listen->next = listen->next->next;
	150	spin_unlock_bh(&listen_lock);
	151	kfree(s);
	152	return;
	153	}
	154
	155	listen = listen->next;
	156	}
	157	spin_unlock_bh(&listen_lock);
	158	}
	159
70868eac RB	160	EXPORT_SYMBOL(ax25_listen_release);
70868eac RB	161
1da177e4 LT	162	int (ax25_protocol_function(unsigned int pid))(struct sk_buff , ax25_cb *)
	163	{
	164	int (res)(struct sk_buff , ax25_cb *) = NULL;
8d5cf596	165	struct ax25_protocol *protocol;
1da177e4 LT	166
	167	read_lock(&protocol_list_lock);
	168	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
	169	if (protocol->pid == pid) {
	170	res = protocol->func;
	171	break;
	172	}
	173	read_unlock(&protocol_list_lock);
	174
	175	return res;
	176	}
	177
	178	int ax25_listen_mine(ax25_address callsign, struct net_device dev)
	179	{
	180	struct listen_struct *listen;
	181
	182	spin_lock_bh(&listen_lock);
	183	for (listen = listen_list; listen != NULL; listen = listen->next)
81dcd169 RB	184	if (ax25cmp(&listen->callsign, callsign) == 0 &&
81dcd169 RB	185	(listen->dev == dev \|\| listen->dev == NULL)) {
1da177e4 LT	186	spin_unlock_bh(&listen_lock);
	187	return 1;
	188	}
	189	spin_unlock_bh(&listen_lock);
	190
	191	return 0;
	192	}
	193
	194	void ax25_link_failed(ax25_cb *ax25, int reason)
	195	{
a4282717 RB	196	struct ax25_linkfail *lf;
a4282717 RB	197	struct hlist_node *node;
1da177e4 LT	198
1da177e4 LT	199	spin_lock_bh(&linkfail_lock);
a4282717 RB	200	hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node)
a4282717 RB	201	lf->func(ax25, reason);
1da177e4 LT	202	spin_unlock_bh(&linkfail_lock);
	203	}
	204
	205	int ax25_protocol_is_registered(unsigned int pid)
	206	{
8d5cf596	207	struct ax25_protocol *protocol;
1da177e4 LT	208	int res = 0;
1da177e4 LT	209
95ff9f4d	210	read_lock_bh(&protocol_list_lock);
1da177e4 LT	211	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
	212	if (protocol->pid == pid) {
	213	res = 1;
	214	break;
	215	}
95ff9f4d	216	read_unlock_bh(&protocol_list_lock);
1da177e4 LT	217
	218	return res;
	219	}