[LLC] use just one struct sock per connection

With this PF_LLC is tightly integrated with the core and that is a
good thing 8)

. kill llc_ui_opt, the only non-duplicated bit is struct sockaddr_llc
  and this now lives in llc_opt
. remove debug code from llc_sk_alloc/free (previously llc_sock_alloc/free)
. the skbs allocated for event processing don't need to have any payload
  at all, just the skb->cb is enough, so remove the bogus 1 from alloc_skb
  calls
. llc_conn_disc put on death row
. llc_process_tmr_ev callers have to hold the socket lock
. the request functions in llc_if.c doesn't hold the socket lock anymore
  its up to its callers on the socket layer (llc_sock.c)
. llc_sk_alloc now receives a priority for sk_alloc call and is the
  only way to alloc a new sock (from llc_mac and llc_sock, bottom and top)
. added the traditional struct sock REFCNT_DEBUG support for llc
. llc_sock was simplified and is on the zen route to cleanliness, wait for
  the next patches, it'll shrink a lot when I zap all the crap (as in
  not needed) list handling, using the existing list maintained in
  struct llc_sap for that, probably splitting it in two, one for listening
  sockets and other for (being) established ones.  Ah, and the sap->ind
  and sap->req and friends will die.

include/linux/llc.h

@@ -78,17 +78,6 @@ enum llc_sockopts {
 #define LLC_SAP_DYN_STOP	0xDE
 #define LLC_SAP_DYN_TRIES	4
 
-struct sock;
-
-struct llc_ui_opt {
-	u16		     link;	/* network layer link number */
-	struct llc_sap	    *sap;	/* pointer to parent SAP */
-	struct sock	    *core_sk;
-	struct net_device   *dev;	/* device to send to remote */
-	struct sockaddr_llc  addr;	/* address sock is bound to */
-};
-
-#define llc_ui_sk(__sk) ((struct llc_ui_opt *)(__sk)->protinfo)
 #define llc_ui_skb_cb(__skb) ((struct sockaddr_llc *)&((__skb)->cb[0]))
 
 #ifdef CONFIG_LLC_UI

include/net/llc_conn.h

@@ -2,7 +2,7 @@
 #define LLC_CONN_H
 /*
  * Copyright (c) 1997 by Procom Technology, Inc.
- * 		 2001 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ * 		 2001, 2002 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.
@@ -13,8 +13,7 @@
  */
 #include <linux/timer.h>
 #include <net/llc_if.h>
-
-#define DEBUG_LLC_CONN_ALLOC
+#include <linux/llc.h>
 
 struct llc_timer {
 	struct timer_list timer;
@@ -25,7 +24,7 @@ struct llc_timer {
 struct llc_opt {
 	struct list_head    node;		/* entry in sap->sk_list.list */
 	struct sock	    *sk;		/* sock that has this llc_opt */
-	void		    *handler;		/* for upper layers usage */
+	struct sockaddr_llc addr;		/* address sock is bound to */
 	u8		    state;		/* state of connection */
 	struct llc_sap	    *sap;		/* pointer to parent SAP */
 	struct llc_addr	    laddr;		/* lsap/mac pair */
@@ -80,60 +79,11 @@ struct llc_opt {
 
 struct llc_conn_state_ev;
 
-extern struct sock *__llc_sock_alloc(int family);
-extern void __llc_sock_free(struct sock *sk, u8 free);
-
-#ifdef DEBUG_LLC_CONN_ALLOC
-#define dump_stack() printk(KERN_INFO "call trace: %p, %p, %p\n",	\
-				__builtin_return_address(0),		\
-				__builtin_return_address(1),		\
-				__builtin_return_address(2));
-#define llc_sock_alloc(family)	({					\
-	struct sock *__sk = __llc_sock_alloc(family);			\
-	if (__sk) {							\
-		llc_sk(__sk)->f_alloc = __FUNCTION__;			\
-		llc_sk(__sk)->l_alloc = __LINE__;			\
-	}								\
-	__sk;})
-#define __llc_sock_assert(__sk)						\
-	if (llc_sk(__sk)->f_free) {					\
-		printk(KERN_ERR						\
-		       "%p conn (alloc'd @ %s(%d)) "			\
-		       "already freed @ %s(%d) "			\
-		       "being used again @ %s(%d)\n",			\
-		       llc_sk(__sk),					\
-		       llc_sk(__sk)->f_alloc, llc_sk(__sk)->l_alloc,	\
-		       llc_sk(__sk)->f_free, llc_sk(__sk)->l_free,	\
-		       __FUNCTION__, __LINE__);				\
-		dump_stack();
-#define llc_sock_free(__sk)						\
-{									\
-	__llc_sock_assert(__sk)						\
-	} else {							\
-		__llc_sock_free(__sk, 0);				\
-		llc_sk(__sk)->f_free = __FUNCTION__;			\
-		llc_sk(__sk)->l_free = __LINE__;			\
-	}								\
-}
-#define llc_sock_assert(__sk)						\
-{									\
-	__llc_sock_assert(__sk);					\
-	return; }							\
-}
-#define llc_sock_assert_ret(__sk, __ret)				\
-{									\
-	__llc_sock_assert(__sk);					\
-	return __ret; }							\
-}
-#else /* DEBUG_LLC_CONN_ALLOC */
-#define llc_sock_alloc(family) __llc_sock_alloc(family)
-#define llc_sock_free(__sk) __llc_sock_free(__sk, 1)
-#define llc_sock_assert(__sk)
-#define llc_sock_assert_ret(__sk)
-#endif /* DEBUG_LLC_CONN_ALLOC */
+extern struct sock *llc_sk_alloc(int family, int priority);
+extern void llc_sk_free(struct sock *sk);
 
-extern void llc_sock_reset(struct sock *sk);
-extern int llc_sock_init(struct sock *sk);
+extern void llc_sk_reset(struct sock *sk);
+extern int llc_sk_init(struct sock *sk);
 
 /* Access to a connection */
 extern int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);

include/net/llc_if.h

@@ -73,8 +73,6 @@ struct llc_prim_conn {
 	u8		   pri;		/* service_class */
 	struct net_device *dev;
 	struct sock	  *sk;		/* returned from REQUEST */
-	void		  *handler;	/* upper layer use,
-					   stored in llc_opt->handler */
 	u16		   link;
 	struct sk_buff	  *skb;		/* received SABME  */
 };

net/llc/llc_actn.c

@@ -134,7 +134,7 @@ int llc_station_ac_report_status(struct llc_station *station,
 static void llc_station_ack_tmr_callback(unsigned long timeout_data)
 {
 	struct llc_station *station = (struct llc_station *)timeout_data;
-	struct sk_buff *skb = alloc_skb(1, GFP_ATOMIC);
+	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
 
 	station->ack_tmr_running = 0;
 	if (skb) {

net/llc/llc_c_ac.c

@@ -1454,8 +1454,9 @@ int llc_conn_ac_set_f_flag_p(struct sock *sk, struct sk_buff *skb)
 void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
 {
 	struct sock *sk = (struct sock *)timeout_data;
-	struct sk_buff *skb = alloc_skb(1, GFP_ATOMIC);
+	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
 
+	bh_lock_sock(sk);
 	llc_sk(sk)->pf_cycle_timer.running = 0;
 	if (skb) {
 		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
@@ -1464,13 +1465,15 @@ void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
 		ev->data.tmr.timer_specific = NULL;
 		llc_process_tmr_ev(sk, skb);
 	}
+	bh_unlock_sock(sk);
 }
 
 static void llc_conn_busy_tmr_cb(unsigned long timeout_data)
 {
 	struct sock *sk = (struct sock *)timeout_data;
-	struct sk_buff *skb = alloc_skb(1, GFP_ATOMIC);
+	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
 
+	bh_lock_sock(sk);
 	llc_sk(sk)->busy_state_timer.running = 0;
 	if (skb) {
 		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
@@ -1479,13 +1482,15 @@ static void llc_conn_busy_tmr_cb(unsigned long timeout_data)
 		ev->data.tmr.timer_specific = NULL;
 		llc_process_tmr_ev(sk, skb);
 	}
+	bh_unlock_sock(sk);
 }
 
 void llc_conn_ack_tmr_cb(unsigned long timeout_data)
 {
 	struct sock* sk = (struct sock *)timeout_data;
-	struct sk_buff *skb = alloc_skb(1, GFP_ATOMIC);
+	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
 
+	bh_lock_sock(sk);
 	llc_sk(sk)->ack_timer.running = 0;
 	if (skb) {
 		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
@@ -1494,13 +1499,15 @@ void llc_conn_ack_tmr_cb(unsigned long timeout_data)
 		ev->data.tmr.timer_specific = NULL;
 		llc_process_tmr_ev(sk, skb);
 	}
+	bh_unlock_sock(sk);
 }
 
 static void llc_conn_rej_tmr_cb(unsigned long timeout_data)
 {
 	struct sock *sk = (struct sock *)timeout_data;
-	struct sk_buff *skb = alloc_skb(1, GFP_ATOMIC);
+	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
 
+	bh_lock_sock(sk);
 	llc_sk(sk)->rej_sent_timer.running = 0;
 	if (skb) {
 		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
@@ -1509,6 +1516,7 @@ static void llc_conn_rej_tmr_cb(unsigned long timeout_data)
 		ev->data.tmr.timer_specific = NULL;
 		llc_process_tmr_ev(sk, skb);
 	}
+	bh_unlock_sock(sk);
 }
 
 int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
@@ -1536,14 +1544,11 @@ int llc_conn_ac_upd_vs(struct sock *sk, struct sk_buff *skb)
  *	llc_conn_disc - removes connection from SAP list and frees it
  *	@sk: closed connection
  *	@skb: occurred event
- *
- *	Returns 2, to indicate the state machine that the connection was freed.
  */
 int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
 {
-	llc_sap_unassign_sock(llc_sk(sk)->sap, sk);
-	llc_sock_free(sk);
-	return 2;
+	/* FIXME: this thing seems to want to die */
+	return 0;
 }
 
 /**
@@ -1555,7 +1560,7 @@ int llc_conn_disc(struct sock *sk, struct sk_buff *skb)
  */
 int llc_conn_reset(struct sock *sk, struct sk_buff *skb)
 {
-	llc_sock_reset(sk);
+	llc_sk_reset(sk);
 	return 0;
 }
 
@@ -1589,19 +1594,16 @@ u8 llc_circular_between(u8 a, u8 b, u8 c)
  */
 static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb)
 {
-	bh_lock_sock(sk);
 	if (llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC) {
 		printk(KERN_WARNING "%s: timer called on closed connection\n",
 		       __FUNCTION__);
 		llc_conn_free_ev(skb);
-		goto out;
-	}
+	} else {
 		if (!sk->lock.users)
 			llc_conn_state_process(sk, skb);
 		else {
 			llc_set_backlog_type(skb, LLC_EVENT);
 			sk_add_backlog(sk, skb);
 		}
-out:
-	bh_unlock_sock(sk);
+	}
 }

net/llc/llc_conn.c

@@ -43,7 +43,7 @@ static int llc_offset_table[NBR_CONN_STATES][NBR_CONN_EV];
  *	@sk: connection
  *	@skb: occurred event
  *
- *	Sends an event to connection state machine. after processing event
+ *	Sends an event to connection state machine. After processing event
  *	(executing it's actions and changing state), upper layer will be
  *	indicated or confirmed, if needed. Returns 0 for success, 1 for
  *	failure. The socket lock has to be held before calling this function.
@@ -65,15 +65,6 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 		llc_conn_free_ev(skb);
 	else if (ind_prim && cfm_prim)
 		skb_get(skb);
-#ifdef THIS_BREAKS_DISCONNECT_NOTIFICATION_BADLY
-	/* check if the connection was freed by the state machine by
-	 * means of llc_conn_disc */
-	if (rc == 2) {
-		printk(KERN_INFO "%s: rc == 2\n", __FUNCTION__);
-		rc = -ECONNABORTED;
-		goto out;
-	}
-#endif	/* THIS_BREAKS_DISCONNECT_NOTIFICATION_BADLY */
 	if (!flag)   /* indicate or confirm not required */
 		goto out;
 	rc = 0;
@@ -83,10 +74,13 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 		 *	  sock crap
 		 */
 		if (flag == LLC_DATA_PRIM + 1) {
-			struct sock *upper = llc_sk(skb->sk)->handler;
-
-			skb->sk = upper;
-			if (sock_queue_rcv_skb(upper, skb)) {
+			if (sock_queue_rcv_skb(skb->sk, skb)) {
+				/*
+				 * FIXME: have to sync the LLC state
+				 *        machine wrt mem usage with
+				 *        sk->{r,w}mem_alloc, will do
+				 *        this soon 8)
+				 */
 				printk(KERN_ERR
 				       "%s: sock_queue_rcv_skb failed!\n",
 				       __FUNCTION__);
@@ -105,10 +99,8 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 	}
 	if (!llc_data_accept_state(llc->state)) {
 		/* In this state, we can send I pdu */
-		struct sock* upper = llc_sk(skb->sk)->handler;
-
-		if (upper)
-			wake_up(upper->sleep);
+		if (skb->sk)
+			skb->sk->write_space(skb->sk);
 	} else
 		rc = llc->failed_data_req = 1;
 	kfree_skb(skb);
@@ -118,7 +110,6 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 
 void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb)
 {
-	llc_sock_assert(sk);
 	/* queue PDU to send to MAC layer */
 	skb_queue_tail(&sk->write_queue, skb);
 	llc_conn_send_pdus(sk);
@@ -380,11 +371,10 @@ static struct llc_conn_state_trans *llc_qualify_conn_ev(struct sock *sk,
  *	llc_exec_conn_trans_actions - executes related actions
  *	@sk: connection
  *	@trans: transition that it's actions must be performed
- *	@skb: happened event
+ *	@skb: event
  *
  *	Executes actions that is related to happened event. Returns 0 for
- *	success, 1 to indicate failure of at least one action or 2 if the
- *	connection was freed (llc_conn_disc was called)
+ *	success, 1 to indicate failure of at least one action.
  */
 static int llc_exec_conn_trans_actions(struct sock *sk,
 				       struct llc_conn_state_trans *trans,

net/llc/llc_if.c

@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
+#include <linux/tcp.h>
 #include <asm/errno.h>
 #include <net/llc_if.h>
 #include <net/llc_sap.h>
@@ -249,7 +250,6 @@ int llc_build_and_send_pkt(struct sock *sk, struct sk_buff *skb)
 	int rc = -ECONNABORTED;
 	struct llc_opt *llc = llc_sk(sk);
 
-	lock_sock(sk);
 	if (llc->state == LLC_CONN_STATE_ADM)
 		goto out;
 	rc = -EBUSY;
@@ -269,7 +269,6 @@ int llc_build_and_send_pkt(struct sock *sk, struct sk_buff *skb)
 	skb->dev	    = llc->dev;
 	rc = llc_conn_state_process(sk, skb);
 out:
-	release_sock(sk);
 	return rc;
 }
 
@@ -299,7 +298,6 @@ static void llc_confirm_impossible(struct llc_prim_if_block *prim)
 static int llc_conn_req_handler(struct llc_prim_if_block *prim)
 {
 	int rc = -EBUSY;
-	struct llc_opt *llc;
 	struct llc_sap *sap = prim->sap;
 	struct sk_buff *skb;
 	struct net_device *ddev = mac_dev_peer(prim->data->conn.dev,
@@ -319,37 +317,16 @@ static int llc_conn_req_handler(struct llc_prim_if_block *prim)
 	daddr.lsap = prim->data->conn.daddr.lsap;
 	sk = llc_lookup_established(sap, &daddr, &laddr);
 	if (sk) {
+		if (sk->state == TCP_ESTABLISHED) {
 			llc_confirm_impossible(prim);
 			goto out_put;
+		} else
+			sock_put(sk);
 	}
 	rc = -ENOMEM;
-	if (prim->data->conn.sk) {
 	sk = prim->data->conn.sk;
-		if (llc_sock_init(sk))
-			goto out;
-	} else {
-		/*
-		 * FIXME: this one will die as soon as core and
-		 * llc_sock starts sharing a struct sock.
-		 */
-		sk = llc_sock_alloc(PF_LLC);
-		if (!sk) {
-			llc_confirm_impossible(prim);
-			goto out;
-		}
-		prim->data->conn.sk = sk;
-	}
 	sock_hold(sk);
-	lock_sock(sk);
-	/* assign new connection to it's SAP */
-	llc_sap_assign_sock(sap, sk);
-	llc = llc_sk(sk);
-	memcpy(&llc->daddr, &daddr, sizeof(llc->daddr));
-	memcpy(&llc->laddr, &laddr, sizeof(llc->laddr));
-	llc->dev     = ddev;
-	llc->link    = prim->data->conn.link;
-	llc->handler = prim->data->conn.handler;
-	skb = alloc_skb(1, GFP_ATOMIC);
+	skb = alloc_skb(0, GFP_ATOMIC);
 	if (skb) {
 		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
@@ -359,15 +336,10 @@ static int llc_conn_req_handler(struct llc_prim_if_block *prim)
 		ev->data.prim.data = prim;
 		rc = llc_conn_state_process(sk, skb);
 	}
-	if (rc) {
-		llc_sap_unassign_sock(sap, sk);
-		llc_sock_free(sk);
+	if (rc)
 		llc_confirm_impossible(prim);
-	}
-	release_sock(sk);
 out_put:
 	sock_put(sk);
-out:
 	return rc;
 }
 
@@ -388,7 +360,6 @@ static int llc_disc_req_handler(struct llc_prim_if_block *prim)
 	struct sock* sk = prim->data->disc.sk;
 
 	sock_hold(sk);
-	lock_sock(sk);
 	if (llc_sk(sk)->state == LLC_CONN_STATE_ADM ||
 	    llc_sk(sk)->state == LLC_CONN_OUT_OF_SVC)
 		goto out;
@@ -396,7 +367,7 @@ static int llc_disc_req_handler(struct llc_prim_if_block *prim)
 	 * Postpone unassigning the connection from its SAP and returning the
 	 * connection until all ACTIONs have been completely executed
 	 */
-	skb = alloc_skb(1, GFP_ATOMIC);
+	skb = alloc_skb(0, GFP_ATOMIC);
 	if (!skb)
 		goto out;
 	ev = llc_conn_ev(skb);
@@ -406,7 +377,6 @@ static int llc_disc_req_handler(struct llc_prim_if_block *prim)
 	ev->data.prim.data = prim;
 	rc = llc_conn_state_process(sk, skb);
 out:
-	release_sock(sk);
 	sock_put(sk);
 	return rc;
 }
@@ -426,8 +396,7 @@ static int llc_rst_req_handler(struct llc_prim_if_block *prim)
 	int rc = 1;
 	struct sock *sk = prim->data->res.sk;
 
-	lock_sock(sk);
-	skb = alloc_skb(1, GFP_ATOMIC);
+	skb = alloc_skb(0, GFP_ATOMIC);
 	if (skb) {
 		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
@@ -437,7 +406,6 @@ static int llc_rst_req_handler(struct llc_prim_if_block *prim)
 		ev->data.prim.data = prim;
 		rc = llc_conn_state_process(sk, skb);
 	}
-	release_sock(sk);
 	return rc;
 }
 
@@ -498,7 +466,7 @@ static int llc_rst_rsp_handler(struct llc_prim_if_block *prim)
 	 * package as event and send it to connection event handler
 	 */
 	struct sock *sk = prim->data->res.sk;
-	struct sk_buff *skb = alloc_skb(1, GFP_ATOMIC);
+	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
 
 	if (skb) {
 		struct llc_conn_state_ev *ev = llc_conn_ev(skb);

net/llc/llc_mac.c

@@ -27,7 +27,7 @@
 #include <net/llc_s_ev.h>
 #include <linux/trdevice.h>
 
-#if 1
+#if 0
 #define dprintk(args...) printk(KERN_DEBUG args)
 #else
 #define dprintk(args...)
@@ -123,23 +123,30 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
 
 		sk = llc_lookup_established(sap, &saddr, &daddr);
 		if (!sk) {
+			struct llc_opt *llc;
+
+			dprintk("%s: llc_lookup_established failed\n", __FUNCTION__);
 			/*
 			 * FIXME: here we'll pass the sk->family of the
 			 * listening socket, if found, when
 			 * llc_lookup_listener is added in the next patches.
 			 */
-			sk = llc_sock_alloc(PF_LLC);
+			sk = llc_sk_alloc(PF_LLC, GFP_ATOMIC);
 			if (!sk)
 				goto drop;
-			memcpy(&llc_sk(sk)->daddr, &saddr, sizeof(saddr));
+			llc = llc_sk(sk);
+			memcpy(&llc->laddr, &daddr, sizeof(llc->laddr));
+			memcpy(&llc->daddr, &saddr, sizeof(llc->daddr));
 			llc_sap_assign_sock(sap, sk);
 			sock_hold(sk);
 		}
 		skb->sk = sk;
 		bh_lock_sock(sk);
-		if (!sk->lock.users)
-			rc = llc_conn_rcv(sk, skb);
-		else {
+		if (!sk->lock.users) {
+			/* rc = */ llc_conn_rcv(sk, skb);
+			rc = 0;
+		} else {
+			dprintk("%s: adding to backlog...\n", __FUNCTION__);
 			llc_set_backlog_type(skb, LLC_PACKET);
 			sk_add_backlog(sk, skb);
 			rc = 0;

net/llc/llc_main.c

@@ -52,6 +52,11 @@ static int llc_rtn_all_conns(struct llc_sap *sap);
 
 static struct llc_station llc_main_station;	/* only one of its kind */
 
+#undef LLC_REFCNT_DEBUG
+#ifdef LLC_REFCNT_DEBUG
+static atomic_t llc_sock_nr;
+#endif
+
 /**
  *	llc_sap_alloc - allocates and initializes sap.
  *
@@ -165,10 +170,12 @@ static int llc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
 }
 
 /**
- *     llc_sock_init - Initialize a socket with default llc values.
+ *     llc_sk_init - Initializes a socket with default llc values.
  *     @sk: socket to intiailize.
+ *
+ *     Initializes a socket with default llc values.
  */
-int llc_sock_init(struct sock* sk)
+int llc_sk_init(struct sock* sk)
 {
 	struct llc_opt *llc = kmalloc(sizeof(*llc), GFP_ATOMIC);
 	int rc = -ENOMEM;
@@ -198,61 +205,83 @@ int llc_sock_init(struct sock* sk)
 }
 
 /**
- *	__llc_sock_alloc - Allocates LLC sock
+ *	llc_sk_alloc - Allocates LLC sock
  *	@family: upper layer protocol family
+ *	@priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
  *
  *	Allocates a LLC sock and initializes it. Returns the new LLC sock
  *	or %NULL if there's no memory available for one
  */
-struct sock *__llc_sock_alloc(int family)
+struct sock *llc_sk_alloc(int family, int priority)
 {
-	struct sock *sk = sk_alloc(family, GFP_ATOMIC, 1, NULL);
+	struct sock *sk = sk_alloc(family, priority, 1, NULL);
 
+	MOD_INC_USE_COUNT;
 	if (!sk)
-		goto out;
-	if (llc_sock_init(sk))
+		goto decmod;
+	if (llc_sk_init(sk))
 		goto outsk;
 	sock_init_data(NULL, sk);
+#ifdef LLC_REFCNT_DEBUG
+	atomic_inc(&llc_sock_nr);
+	printk(KERN_DEBUG "LLC socket %p created in %s, now we have %d alive\n", sk,
+		__FUNCTION__, atomic_read(&llc_sock_nr));
+#endif
 out:
 	return sk;
 outsk:
 	sk_free(sk);
 	sk = NULL;
+decmod:
+	MOD_DEC_USE_COUNT;
 	goto out;
 }
 
 /**
- *	__llc_sock_free - Frees a LLC socket
+ *	llc_sk_free - Frees a LLC socket
  *	@sk - socket to free
  *
  *	Frees a LLC socket
  */
-void __llc_sock_free(struct sock *sk, u8 free)
+void llc_sk_free(struct sock *sk)
 {
 	struct llc_opt *llc = llc_sk(sk);
 
 	llc->state = LLC_CONN_OUT_OF_SVC;
-	/* stop all (possibly) running timers */
+	/* Stop all (possibly) running timers */
 	llc_conn_ac_stop_all_timers(sk, NULL);
 #ifdef DEBUG_LLC_CONN_ALLOC
 	printk(KERN_INFO "%s: unackq=%d, txq=%d\n", __FUNCTION__,
 		skb_queue_len(&llc->pdu_unack_q),
 		skb_queue_len(&sk->write_queue));
 #endif
+	skb_queue_purge(&sk->receive_queue);
 	skb_queue_purge(&sk->write_queue);
 	skb_queue_purge(&llc->pdu_unack_q);
-	if (free)
+#ifdef LLC_REFCNT_DEBUG
+	if (atomic_read(&sk->refcnt) != 1) {
+		printk(KERN_DEBUG "Destruction of LLC sock %p delayed in %s, cnt=%d\n",
+			sk, __FUNCTION__, atomic_read(&sk->refcnt));
+		printk(KERN_DEBUG "%d LLC sockets are still alive\n",
+			atomic_read(&llc_sock_nr));
+	} else {
+		atomic_dec(&llc_sock_nr);
+		printk(KERN_DEBUG "LLC socket %p released in %s, %d are still alive\n", sk,
+			__FUNCTION__, atomic_read(&llc_sock_nr));
+	}
+#endif
 	sock_put(sk);
+	MOD_DEC_USE_COUNT;
 }
 
 /**
- *	llc_sock_reset - resets a connection
+ *	llc_sk_reset - resets a connection
  *	@sk: LLC socket to reset
  *
  *	Resets a connection to the out of service state. Stops its timers
  *	and frees any frames in the queues of the connection.
  */
-void llc_sock_reset(struct sock *sk)
+void llc_sk_reset(struct sock *sk)
 {
 	struct llc_opt *llc = llc_sk(sk);
 
@@ -585,7 +614,7 @@ static int __init llc_init(void)
 	skb_queue_head_init(&llc_main_station.mac_pdu_q);
 	skb_queue_head_init(&llc_main_station.ev_q.list);
 	spin_lock_init(&llc_main_station.ev_q.lock);
-	skb = alloc_skb(1, GFP_ATOMIC);
+	skb = alloc_skb(0, GFP_ATOMIC);
 	if (!skb)
 		goto err;
 	llc_build_offset_table();