#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);
-unsigned char llc_station_mac_sa[ETH_ALEN];
-
/**
* llc_sap_alloc - allocates and initializes sap.
*
*/
static struct llc_sap *llc_sap_alloc(void)
{
- struct llc_sap *sap = kmalloc(sizeof(*sap), GFP_ATOMIC);
+ struct llc_sap *sap = kzalloc(sizeof(*sap), GFP_ATOMIC);
if (sap) {
- memset(sap, 0, sizeof(*sap));
+ /* sap->laddr.mac - leave as a null, it's filled by bind */
sap->state = LLC_SAP_STATE_ACTIVE;
- memcpy(sap->laddr.mac, llc_station_mac_sa, ETH_ALEN);
rwlock_init(&sap->sk_list.lock);
+ atomic_set(&sap->refcnt, 1);
}
return sap;
}
*/
static void llc_add_sap(struct llc_sap *sap)
{
- write_lock_bh(&llc_sap_list_lock);
list_add_tail(&sap->node, &llc_sap_list);
- write_unlock_bh(&llc_sap_list_lock);
}
/**
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);
- list_for_each_entry(sap, &llc_sap_list, node)
- if (sap->laddr.lsap == sap_value)
- goto out;
- sap = NULL;
-out:
+ sap = __llc_sap_find(sap_value);
+ if (sap)
+ llc_sap_hold(sap);
read_unlock_bh(&llc_sap_list_lock);
return sap;
}
struct packet_type *pt,
struct net_device *orig_dev))
{
- struct llc_sap *sap = llc_sap_find(lsap);
+ struct llc_sap *sap = NULL;
- if (sap) { /* SAP already exists */
- 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->rcv_func = func;
llc_add_sap(sap);
out:
+ write_unlock_bh(&llc_sap_list_lock);
return sap;
}
static int __init llc_init(void)
{
- if (dev_base->next)
- memcpy(llc_station_mac_sa, dev_base->next->dev_addr, ETH_ALEN);
- else
- memset(llc_station_mac_sa, 0, ETH_ALEN);
+ 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;
module_init(llc_init);
module_exit(llc_exit);
-EXPORT_SYMBOL(llc_station_mac_sa);
EXPORT_SYMBOL(llc_sap_list);
EXPORT_SYMBOL(llc_sap_list_lock);
EXPORT_SYMBOL(llc_sap_find);