mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Tim BirdandJakub Kicinski
0b13c6a618
Most of the lls source files are missing SPDX-License-Identifier lines. Add appropriate IDs to these files, and remove other license info from the header. In once case, leave the existing id line and just remove the license reference text. Signed-off-by: Tim Bird <tim.bird@sony.com> Link: https://patch.msgid.link/20260522225508.24006-1-tim.bird@sony.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* 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>
|
|
*/
|
|
|
|
#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);
|
|
static DEFINE_SPINLOCK(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_obj(*sap, GFP_ATOMIC);
|
|
int i;
|
|
|
|
if (sap) {
|
|
/* sap->laddr.mac - leave as a null, it's filled by bind */
|
|
sap->state = LLC_SAP_STATE_ACTIVE;
|
|
spin_lock_init(&sap->sk_lock);
|
|
for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++)
|
|
INIT_HLIST_NULLS_HEAD(&sap->sk_laddr_hash[i], i);
|
|
refcount_set(&sap->refcnt, 1);
|
|
}
|
|
return sap;
|
|
}
|
|
|
|
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 - searches a SAP in station
|
|
* @sap_value: sap to be found
|
|
*
|
|
* Searches 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;
|
|
|
|
rcu_read_lock_bh();
|
|
sap = __llc_sap_find(sap_value);
|
|
if (!sap || !llc_sap_hold_safe(sap))
|
|
sap = NULL;
|
|
rcu_read_unlock_bh();
|
|
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;
|
|
|
|
spin_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;
|
|
list_add_tail_rcu(&sap->node, &llc_sap_list);
|
|
out:
|
|
spin_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(sap->sk_count);
|
|
|
|
spin_lock_bh(&llc_sap_list_lock);
|
|
list_del_rcu(&sap->node);
|
|
spin_unlock_bh(&llc_sap_list_lock);
|
|
|
|
kfree_rcu(sap, rcu);
|
|
}
|
|
|
|
static struct packet_type llc_packet_type __read_mostly = {
|
|
.type = cpu_to_be16(ETH_P_802_2),
|
|
.func = llc_rcv,
|
|
};
|
|
|
|
static int __init llc_init(void)
|
|
{
|
|
dev_add_pack(&llc_packet_type);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit llc_exit(void)
|
|
{
|
|
dev_remove_pack(&llc_packet_type);
|
|
}
|
|
|
|
module_init(llc_init);
|
|
module_exit(llc_exit);
|
|
|
|
EXPORT_SYMBOL(llc_sap_list);
|
|
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");
|