/*
* llc_core.c - Minimum needed routines for sap handling and module init/exit
*
* Copyright (c) 1997 by Procom Technology, Inc.
* 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*
* This program can be redistributed or modified under the terms of the
* GNU General Public License as published by the Free Software Foundation.
* This program is distributed without any warranty or implied warranty
* of merchantability or fitness for a particular purpose.
*
* See the GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <net/net_namespace.h>
#include <net/llc.h>
LIST_HEAD(llc_sap_list);
DEFINE_RWLOCK(llc_sap_list_lock);
/**
* llc_sap_alloc - allocates and initializes sap.
*
* Allocates and initializes sap.
*/
static struct llc_sap *llc_sap_alloc(void)
{
struct llc_sap *sap = kzalloc(sizeof(*sap), GFP_ATOMIC);
if (sap) {
/* sap->laddr.mac - leave as a null, it's filled by bind */
sap->state = LLC_SAP_STATE_ACTIVE;
rwlock_init(&sap->sk_list.lock);
atomic_set(&sap->refcnt, 1);
}
return sap;
}
/**
* llc_add_sap - add sap to station list
* @sap: Address of the sap
*
* Adds a sap to the LLC's station sap list.
*/
static void llc_add_sap(struct llc_sap *sap)
{
list_add_tail(&sap->node, &llc_sap_list);
}
/**
* llc_del_sap - del sap from station list
* @sap: Address of the sap
*
* Removes a sap to the LLC's station sap list.
*/
static void llc_del_sap(struct llc_sap *sap)
{
write_lock_bh(&llc_sap_list_lock);
list_del(&sap->node);
write_unlock_bh(&llc_sap_list_lock);
}
static struct llc_sap *__llc_sap_find(unsigned char sap_value)
{
struct llc_sap* sap;
list_for_each_entry(sap, &llc_sap_list, node)
if (sap->laddr.lsap == sap_value)
goto out;
sap = NULL;
out:
return sap;
}
/**
* llc_sap_find - searchs a SAP in station
* @sap_value: sap to be found
*
* Searchs for a sap in the sap list of the LLC's station upon the sap ID.
* If the sap is found it will be refcounted and the user will have to do
* a llc_sap_put after use.
* Returns the sap or %NULL if not found.
*/
struct llc_sap *llc_sap_find(unsigned char sap_value)
{
struct llc_sap* sap;
read_lock_bh(&llc_sap_list_lock);
sap = __llc_sap_find(sap_value);
if (sap)
llc_sap_hold(sap);
read_unlock_bh(&llc_sap_list_lock);
return sap;
}
/**
* llc_sap_open - open interface to the upper layers.
* @lsap: SAP number.
* @func: rcv func for datalink protos
*
* Interface function to upper layer. Each one who wants to get a SAP
* (for example NetBEUI) should call this function. Returns the opened
* SAP for success, NULL for failure.
*/
struct llc_sap *llc_sap_open(unsigned char lsap,
int (*func)(struct sk_buff *skb,
struct net_device *dev,
struct packet_type *pt,
struct net_device *orig_dev))
{
struct llc_sap *sap = NULL;
write_lock_bh(&llc_sap_list_lock);
if (__llc_sap_find(lsap)) /* SAP already exists */
goto out;
sap = llc_sap_alloc();
if (!sap)
goto out;
sap->laddr.lsap = lsap;
sap->rcv_func = func;
llc_add_sap(sap);
out:
write_unlock_bh(&llc_sap_list_lock);
return sap;
}
/**
* llc_sap_close - close interface for upper layers.
* @sap: SAP to be closed.
*
* Close interface function to upper layer. Each one who wants to
* close an open SAP (for example NetBEUI) should call this function.
* Removes this sap from the list of saps in the station and then
* frees the memory for this sap.
*/
void llc_sap_close(struct llc_sap *sap)
{
WARN_ON(!hlist_empty(&sap->sk_list.list));
llc_del_sap(sap);
kfree(sap);
}
static struct packet_type llc_packet_type __read_mostly = {
.type = cpu_to_be16(ETH_P_802_2),
.func = llc_rcv,
};
static struct packet_type llc_tr_packet_type __read_mostly = {
.type = cpu_to_be16(ETH_P_TR_802_2),
.func = llc_rcv,
};
static int __init llc_init(void)
{
struct net_device *dev;
dev = first_net_device(&init_net);
if (dev != NULL)
dev = next_net_device(dev);
dev_add_pack(&llc_packet_type);
dev_add_pack(&llc_tr_packet_type);
return 0;
}
static void __exit llc_exit(void)
{
dev_remove_pack(&llc_packet_type);
dev_remove_pack(&llc_tr_packet_type);
}
module_init(llc_init);
module_exit(llc_exit);
EXPORT_SYMBOL(llc_sap_list);
EXPORT_SYMBOL(llc_sap_list_lock);
EXPORT_SYMBOL(llc_sap_find);
EXPORT_SYMBOL(llc_sap_open);
EXPORT_SYMBOL(llc_sap_close);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
MODULE_DESCRIPTION("LLC IEEE 802.2 core support");
