[net-next-2.6.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 <linux/slab.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>
5a0e3ad6	20	#include <linux/slab.h>
1da177e4 LT	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
8d5cf596	32	static struct ax25_protocol *protocol_list;
1da177e4 LT	33	static DEFINE_RWLOCK(protocol_list_lock);
1da177e4 LT	34
a4282717	35	static HLIST_HEAD(ax25_linkfail_list);
1da177e4 LT	36	static DEFINE_SPINLOCK(linkfail_lock);
	37
	38	static struct listen_struct {
	39	struct listen_struct *next;
	40	ax25_address callsign;
	41	struct net_device *dev;
	42	} *listen_list = NULL;
	43	static DEFINE_SPINLOCK(listen_lock);
	44
8d5cf596 RB	45	/*
	46	* Do not register the internal protocols AX25_P_TEXT, AX25_P_SEGMENT,
	47	* AX25_P_IP or AX25_P_ARP ...
	48	*/
	49	void ax25_register_pid(struct ax25_protocol *ap)
1da177e4	50	{
95ff9f4d	51	write_lock_bh(&protocol_list_lock);
8d5cf596 RB	52	ap->next = protocol_list;
8d5cf596 RB	53	protocol_list = ap;
95ff9f4d	54	write_unlock_bh(&protocol_list_lock);
1da177e4 LT	55	}
1da177e4 LT	56
8d5cf596	57	EXPORT_SYMBOL_GPL(ax25_register_pid);
70868eac	58
1da177e4 LT	59	void ax25_protocol_release(unsigned int pid)
1da177e4 LT	60	{
8d5cf596	61	struct ax25_protocol s, protocol;
1da177e4	62
95ff9f4d	63	write_lock_bh(&protocol_list_lock);
1da177e4	64	protocol = protocol_list;
910d30b7 IJ	65	if (protocol == NULL)
910d30b7 IJ	66	goto out;
1da177e4 LT	67
	68	if (protocol->pid == pid) {
	69	protocol_list = protocol->next;
910d30b7	70	goto out;
1da177e4 LT	71	}
	72
	73	while (protocol != NULL && protocol->next != NULL) {
	74	if (protocol->next->pid == pid) {
	75	s = protocol->next;
	76	protocol->next = protocol->next->next;
910d30b7	77	goto out;
1da177e4 LT	78	}
	79
	80	protocol = protocol->next;
	81	}
910d30b7	82	out:
95ff9f4d	83	write_unlock_bh(&protocol_list_lock);
1da177e4 LT	84	}
1da177e4 LT	85
70868eac RB	86	EXPORT_SYMBOL(ax25_protocol_release);
70868eac RB	87
a4282717	88	void ax25_linkfail_register(struct ax25_linkfail *lf)
1da177e4	89	{
1da177e4	90	spin_lock_bh(&linkfail_lock);
a4282717	91	hlist_add_head(&lf->lf_node, &ax25_linkfail_list);
1da177e4	92	spin_unlock_bh(&linkfail_lock);
1da177e4 LT	93	}
1da177e4 LT	94
70868eac RB	95	EXPORT_SYMBOL(ax25_linkfail_register);
70868eac RB	96
a4282717	97	void ax25_linkfail_release(struct ax25_linkfail *lf)
1da177e4	98	{
1da177e4	99	spin_lock_bh(&linkfail_lock);
a4282717	100	hlist_del_init(&lf->lf_node);
1da177e4 LT	101	spin_unlock_bh(&linkfail_lock);
	102	}
	103
70868eac RB	104	EXPORT_SYMBOL(ax25_linkfail_release);
70868eac RB	105
1da177e4 LT	106	int ax25_listen_register(ax25_address callsign, struct net_device dev)
	107	{
	108	struct listen_struct *listen;
	109
	110	if (ax25_listen_mine(callsign, dev))
	111	return 0;
	112
	113	if ((listen = kmalloc(sizeof(*listen), GFP_ATOMIC)) == NULL)
81dcd169	114	return -ENOMEM;
1da177e4 LT	115
	116	listen->callsign = *callsign;
	117	listen->dev = dev;
	118
	119	spin_lock_bh(&listen_lock);
	120	listen->next = listen_list;
	121	listen_list = listen;
	122	spin_unlock_bh(&listen_lock);
	123
81dcd169	124	return 0;
1da177e4 LT	125	}
1da177e4 LT	126
70868eac RB	127	EXPORT_SYMBOL(ax25_listen_register);
70868eac RB	128
1da177e4 LT	129	void ax25_listen_release(ax25_address callsign, struct net_device dev)
	130	{
	131	struct listen_struct s, listen;
	132
	133	spin_lock_bh(&listen_lock);
	134	listen = listen_list;
	135	if (listen == NULL) {
	136	spin_unlock_bh(&listen_lock);
	137	return;
	138	}
	139
	140	if (ax25cmp(&listen->callsign, callsign) == 0 && listen->dev == dev) {
	141	listen_list = listen->next;
	142	spin_unlock_bh(&listen_lock);
	143	kfree(listen);
	144	return;
	145	}
	146
	147	while (listen != NULL && listen->next != NULL) {
	148	if (ax25cmp(&listen->next->callsign, callsign) == 0 && listen->next->dev == dev) {
	149	s = listen->next;
	150	listen->next = listen->next->next;
	151	spin_unlock_bh(&listen_lock);
	152	kfree(s);
	153	return;
	154	}
	155
	156	listen = listen->next;
	157	}
	158	spin_unlock_bh(&listen_lock);
	159	}
	160
70868eac RB	161	EXPORT_SYMBOL(ax25_listen_release);
70868eac RB	162
1da177e4 LT	163	int (ax25_protocol_function(unsigned int pid))(struct sk_buff , ax25_cb *)
	164	{
	165	int (res)(struct sk_buff , ax25_cb *) = NULL;
8d5cf596	166	struct ax25_protocol *protocol;
1da177e4 LT	167
	168	read_lock(&protocol_list_lock);
	169	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
	170	if (protocol->pid == pid) {
	171	res = protocol->func;
	172	break;
	173	}
	174	read_unlock(&protocol_list_lock);
	175
	176	return res;
	177	}
	178
	179	int ax25_listen_mine(ax25_address callsign, struct net_device dev)
	180	{
	181	struct listen_struct *listen;
	182
	183	spin_lock_bh(&listen_lock);
	184	for (listen = listen_list; listen != NULL; listen = listen->next)
81dcd169 RB	185	if (ax25cmp(&listen->callsign, callsign) == 0 &&
81dcd169 RB	186	(listen->dev == dev \|\| listen->dev == NULL)) {
1da177e4 LT	187	spin_unlock_bh(&listen_lock);
	188	return 1;
	189	}
	190	spin_unlock_bh(&listen_lock);
	191
	192	return 0;
	193	}
	194
	195	void ax25_link_failed(ax25_cb *ax25, int reason)
	196	{
a4282717 RB	197	struct ax25_linkfail *lf;
a4282717 RB	198	struct hlist_node *node;
1da177e4 LT	199
1da177e4 LT	200	spin_lock_bh(&linkfail_lock);
a4282717 RB	201	hlist_for_each_entry(lf, node, &ax25_linkfail_list, lf_node)
a4282717 RB	202	lf->func(ax25, reason);
1da177e4 LT	203	spin_unlock_bh(&linkfail_lock);
	204	}
	205
	206	int ax25_protocol_is_registered(unsigned int pid)
	207	{
8d5cf596	208	struct ax25_protocol *protocol;
1da177e4 LT	209	int res = 0;
1da177e4 LT	210
95ff9f4d	211	read_lock_bh(&protocol_list_lock);
1da177e4 LT	212	for (protocol = protocol_list; protocol != NULL; protocol = protocol->next)
	213	if (protocol->pid == pid) {
	214	res = 1;
	215	break;
	216	}
95ff9f4d	217	read_unlock_bh(&protocol_list_lock);
1da177e4 LT	218
	219	return res;
	220	}