Merge master.kernel.org:/pub/scm/linux/kernel/git/acme/llc-2.6

18 files changed, 806 insertions, 604 deletions

diff --git a/net/802/p8022.c b/net/802/p8022.c
index b24817c63ca8..2530f35241cd 100644
--- a/net/802/p8022.c
+++ b/net/802/p8022.c
@@ -56,7 +56,7 @@ struct datalink_proto *register_8022_client(unsigned char type,
 
 void unregister_8022_client(struct datalink_proto *proto)
 {
-	llc_sap_close(proto->sap);
+	llc_sap_put(proto->sap);
 	kfree(proto);
 }
 
diff --git a/net/802/psnap.c b/net/802/psnap.c
index ab80b1fab53c..4d638944d933 100644
--- a/net/802/psnap.c
+++ b/net/802/psnap.c
@@ -106,7 +106,7 @@ module_init(snap_init);
 
 static void __exit snap_exit(void)
 {
-	llc_sap_close(snap_sap);
+	llc_sap_put(snap_sap);
 }
 
 module_exit(snap_exit);
diff --git a/net/802/tr.c b/net/802/tr.c
index 1bb7dc1b85cd..1eaa3d19d8bf 100644
--- a/net/802/tr.c
+++ b/net/802/tr.c
@@ -238,7 +238,7 @@ unsigned short tr_type_trans(struct sk_buff *skb, struct net_device *dev)
 		return trllc->ethertype;
 	}
 
-	return ntohs(ETH_P_802_2);
+	return ntohs(ETH_P_TR_802_2);
 }
 
 /*
diff --git a/net/core/dev.c b/net/core/dev.c
index c01511e3d0c1..37c881070963 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -574,6 +574,8 @@ struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
 	return dev;
 }
 
+EXPORT_SYMBOL(dev_getbyhwaddr);
+
 struct net_device *dev_getfirstbyhwtype(unsigned short type)
 {
 	struct net_device *dev;
diff --git a/net/llc/Makefile b/net/llc/Makefile
index 5ebd4ed2bd42..4e260cff3c5d 100644
--- a/net/llc/Makefile
+++ b/net/llc/Makefile
@@ -22,3 +22,4 @@ llc2-y := llc_if.o llc_c_ev.o llc_c_ac.o llc_conn.o llc_c_st.o llc_pdu.o \
 	  llc_sap.o llc_s_ac.o llc_s_ev.o llc_s_st.o af_llc.o llc_station.o
 
 llc2-$(CONFIG_PROC_FS) += llc_proc.o
+llc2-$(CONFIG_SYSCTL)  += sysctl_net_llc.o
diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index 66f55e514b56..59d02cbbeb9e 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -21,6 +21,7 @@
  * See the GNU General Public License for more details.
  */
 #include <linux/config.h>
+#include <linux/compiler.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/rtnetlink.h>
@@ -37,10 +38,9 @@ static u16 llc_ui_sap_link_no_max[256];
 static struct sockaddr_llc llc_ui_addrnull;
 static struct proto_ops llc_ui_ops;
 
-static int llc_ui_wait_for_conn(struct sock *sk, int timeout);
-static int llc_ui_wait_for_disc(struct sock *sk, int timeout);
-static int llc_ui_wait_for_data(struct sock *sk, int timeout);
-static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout);
+static int llc_ui_wait_for_conn(struct sock *sk, long timeout);
+static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
+static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
 
 #if 0
 #define dprintk(args...) printk(KERN_DEBUG args)
@@ -116,12 +116,12 @@ static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
 	struct llc_sock* llc = llc_sk(sk);
 	int rc = 0;
 
-	if (llc_data_accept_state(llc->state) || llc->p_flag) {
-		int timeout = sock_sndtimeo(sk, noblock);
+	if (unlikely(llc_data_accept_state(llc->state) || llc->p_flag)) {
+		long timeout = sock_sndtimeo(sk, noblock);
 
 		rc = llc_ui_wait_for_busy_core(sk, timeout);
 	}
-	if (!rc)
+	if (unlikely(!rc))
 		rc = llc_build_and_send_pkt(sk, skb);
 	return rc;
 }
@@ -155,7 +155,7 @@ static int llc_ui_create(struct socket *sock, int protocol)
 	struct sock *sk;
 	int rc = -ESOCKTNOSUPPORT;
 
-	if (sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM) {
+	if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
 		rc = -ENOMEM;
 		sk = llc_sk_alloc(PF_LLC, GFP_KERNEL, &llc_proto);
 		if (sk) {
@@ -177,7 +177,7 @@ static int llc_ui_release(struct socket *sock)
 	struct sock *sk = sock->sk;
 	struct llc_sock *llc;
 
-	if (!sk)
+	if (unlikely(sk == NULL))
 		goto out;
 	sock_hold(sk);
 	lock_sock(sk);
@@ -189,10 +189,6 @@ static int llc_ui_release(struct socket *sock)
 	if (!sock_flag(sk, SOCK_ZAPPED))
 		llc_sap_remove_socket(llc->sap, sk);
 	release_sock(sk);
-	if (llc->sap && hlist_empty(&llc->sap->sk_list.list)) {
-		llc_release_sockets(llc->sap);
-		llc_sap_close(llc->sap);
-	}
 	if (llc->dev)
 		dev_put(llc->dev);
 	sock_put(sk);
@@ -221,6 +217,7 @@ static int llc_ui_autoport(void)
 				llc_ui_sap_last_autoport = i + 2;
 				goto out;
 			}
+			llc_sap_put(sap);
 		}
 		llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
 		tries++;
@@ -231,20 +228,13 @@ out:
 }
 
 /**
- *	llc_ui_autobind - Bind a socket to a specific address.
- *	@sk: Socket to bind an address to.
- *	@addr: Address the user wants the socket bound to.
+ *	llc_ui_autobind - automatically bind a socket to a sap
+ *	@sock: socket to bind
+ *	@addr: address to connect to
+ *
+ * 	Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
+ * 	specifically used llc_ui_bind to bind to an specific address/sap
  *
- *	Bind a socket to a specific address. For llc a user is able to bind to
- *	a specific sap only or mac + sap. If the user only specifies a sap and
- *	a null dmac (all zeros) the user is attempting to bind to an entire
- *	sap. This will stop anyone else on the local system from using that
- *	sap.  If someone else has a mac + sap open the bind to null + sap will
- *	fail.
- *	If the user desires to bind to a specific mac + sap, it is possible to
- *	have multiple sap connections via multiple macs.
- *	Bind and autobind for that matter must enforce the correct sap usage
- *	otherwise all hell will break loose.
  *	Returns: 0 upon success, negative otherwise.
  */
 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
@@ -285,11 +275,7 @@ out:
  *	@addrlen: Length of the uaddr structure.
  *
  *	Bind a socket to a specific address. For llc a user is able to bind to
- *	a specific sap only or mac + sap. If the user only specifies a sap and
- *	a null dmac (all zeros) the user is attempting to bind to an entire
- *	sap. This will stop anyone else on the local system from using that
- *	sap. If someone else has a mac + sap open the bind to null + sap will
- *	fail.
+ *	a specific sap only or mac + sap.
  *	If the user desires to bind to a specific mac + sap, it is possible to
  *	have multiple sap connections via multiple macs.
  *	Bind and autobind for that matter must enforce the correct sap usage
@@ -305,10 +291,16 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
 	int rc = -EINVAL;
 
 	dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap);
-	if (!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))
+	if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
 		goto out;
 	rc = -EAFNOSUPPORT;
-	if (addr->sllc_family != AF_LLC)
+	if (unlikely(addr->sllc_family != AF_LLC))
+		goto out;
+	rc = -ENODEV;
+	rtnl_lock();
+	llc->dev = dev_getbyhwaddr(addr->sllc_arphrd, addr->sllc_mac);
+	rtnl_unlock();
+	if (!llc->dev)
 		goto out;
 	if (!addr->sllc_sap) {
 		rc = -EUSERS;
@@ -322,6 +314,7 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
 		rc = -EBUSY; /* some other network layer is using the sap */
 		if (!sap)
 			goto out;
+		llc_sap_hold(sap);
 	} else {
 		struct llc_addr laddr, daddr;
 		struct sock *ask;
@@ -338,7 +331,7 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
 		ask = llc_lookup_established(sap, &daddr, &laddr);
 		if (ask) {
 			sock_put(ask);
-			goto out;
+			goto out_put;
 		}
 	}
 	llc->laddr.lsap = addr->sllc_sap;
@@ -348,6 +341,8 @@ static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
 	llc_sap_add_socket(sap, sk);
 	sock_reset_flag(sk, SOCK_ZAPPED);
 	rc = 0;
+out_put:
+	llc_sap_put(sap);
 out:
 	return rc;
 }
@@ -369,7 +364,7 @@ static int llc_ui_shutdown(struct socket *sock, int how)
 	int rc = -ENOTCONN;
 
 	lock_sock(sk);
-	if (sk->sk_state != TCP_ESTABLISHED)
+	if (unlikely(sk->sk_state != TCP_ESTABLISHED))
 		goto out;
 	rc = -EINVAL;
 	if (how != 2)
@@ -404,14 +399,18 @@ static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
 	struct sock *sk = sock->sk;
 	struct llc_sock *llc = llc_sk(sk);
 	struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
-	struct net_device *dev;
 	int rc = -EINVAL;
 
 	lock_sock(sk);
-	if (addrlen != sizeof(*addr))
+	if (unlikely(addrlen != sizeof(*addr)))
 		goto out;
 	rc = -EAFNOSUPPORT;
-	if (addr->sllc_family != AF_LLC)
+	if (unlikely(addr->sllc_family != AF_LLC))
+		goto out;
+	if (unlikely(sk->sk_type != SOCK_STREAM))
+		goto out;
+	rc = -EALREADY;
+	if (unlikely(sock->state == SS_CONNECTING))
 		goto out;
 	/* bind connection to sap if user hasn't done it. */
 	if (sock_flag(sk, SOCK_ZAPPED)) {
@@ -419,19 +418,13 @@ static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
 		rc = llc_ui_autobind(sock, addr);
 		if (rc)
 			goto out;
-		llc->daddr.lsap = addr->sllc_sap;
-		memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
 	}
-	dev = llc->dev;
-	if (sk->sk_type != SOCK_STREAM)
-		goto out;
-	rc = -EALREADY;
-	if (sock->state == SS_CONNECTING)
-		goto out;
+	llc->daddr.lsap = addr->sllc_sap;
+	memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
 	sock->state = SS_CONNECTING;
 	sk->sk_state   = TCP_SYN_SENT;
 	llc->link   = llc_ui_next_link_no(llc->sap->laddr.lsap);
-	rc = llc_establish_connection(sk, dev->dev_addr,
+	rc = llc_establish_connection(sk, llc->dev->dev_addr,
 				      addr->sllc_mac, addr->sllc_sap);
 	if (rc) {
 		dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__);
@@ -439,12 +432,30 @@ static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
 		sk->sk_state = TCP_CLOSE;
 		goto out;
 	}
-	rc = llc_ui_wait_for_conn(sk, sk->sk_rcvtimeo);
-	if (rc)
-		dprintk("%s: llc_ui_wait_for_conn failed=%d\n", __FUNCTION__, rc);
+
+	if (sk->sk_state == TCP_SYN_SENT) {
+		const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
+
+		if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
+			goto out;
+
+		rc = sock_intr_errno(timeo);
+		if (signal_pending(current))
+			goto out;
+	}
+
+	if (sk->sk_state == TCP_CLOSE)
+		goto sock_error;
+
+	sock->state = SS_CONNECTED;
+	rc = 0;
 out:
 	release_sock(sk);
 	return rc;
+sock_error:
+	rc = sock_error(sk) ? : -ECONNABORTED;
+	sock->state = SS_UNCONNECTED;
+	goto out;
 }
 
 /**
@@ -461,10 +472,10 @@ static int llc_ui_listen(struct socket *sock, int backlog)
 	int rc = -EINVAL;
 
 	lock_sock(sk);
-	if (sock->state != SS_UNCONNECTED)
+	if (unlikely(sock->state != SS_UNCONNECTED))
 		goto out;
 	rc = -EOPNOTSUPP;
-	if (sk->sk_type != SOCK_STREAM)
+	if (unlikely(sk->sk_type != SOCK_STREAM))
 		goto out;
 	rc = -EAGAIN;
 	if (sock_flag(sk, SOCK_ZAPPED))
@@ -483,20 +494,14 @@ out:
 	return rc;
 }
 
-static int llc_ui_wait_for_disc(struct sock *sk, int timeout)
+static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
 {
-	DECLARE_WAITQUEUE(wait, current);
-	int rc;
+	DEFINE_WAIT(wait);
+	int rc = 0;
 
-	add_wait_queue_exclusive(sk->sk_sleep, &wait);
-	for (;;) {
-		__set_current_state(TASK_INTERRUPTIBLE);
-		rc = 0;
-		if (sk->sk_state != TCP_CLOSE) {
-			release_sock(sk);
-			timeout = schedule_timeout(timeout);
-			lock_sock(sk);
-		} else
+	while (1) {
+		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+		if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE))
 			break;
 		rc = -ERESTARTSYS;
 		if (signal_pending(current))
@@ -504,65 +509,40 @@ static int llc_ui_wait_for_disc(struct sock *sk, int timeout)
 		rc = -EAGAIN;
 		if (!timeout)
 			break;
+		rc = 0;
 	}
-	__set_current_state(TASK_RUNNING);
-	remove_wait_queue(sk->sk_sleep, &wait);
+	finish_wait(sk->sk_sleep, &wait);
 	return rc;
 }
 
-static int llc_ui_wait_for_conn(struct sock *sk, int timeout)
+static int llc_ui_wait_for_conn(struct sock *sk, long timeout)
 {
-	DECLARE_WAITQUEUE(wait, current);
-	int rc;
+	DEFINE_WAIT(wait);
 
-	add_wait_queue_exclusive(sk->sk_sleep, &wait);
-	for (;;) {
-		__set_current_state(TASK_INTERRUPTIBLE);
-		rc = -EAGAIN;
-		if (sk->sk_state == TCP_CLOSE)
-			break;
-		rc = 0;
-		if (sk->sk_state != TCP_ESTABLISHED) {
-			release_sock(sk);
-			timeout = schedule_timeout(timeout);
-			lock_sock(sk);
-		} else
+	while (1) {
+		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
+		if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT))
 			break;
-		rc = -ERESTARTSYS;
-		if (signal_pending(current))
-			break;
-		rc = -EAGAIN;
-		if (!timeout)
+		if (signal_pending(current) || !timeout)
 			break;
 	}
-	__set_current_state(TASK_RUNNING);
-	remove_wait_queue(sk->sk_sleep, &wait);
-	return rc;
+	finish_wait(sk->sk_sleep, &wait);
+	return timeout;
 }
 
-static int llc_ui_wait_for_data(struct sock *sk, int timeout)
+static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
 {
-	DECLARE_WAITQUEUE(wait, current);
-	int rc = 0;
+	DEFINE_WAIT(wait);
+	struct llc_sock *llc = llc_sk(sk);
+	int rc;
 
-	add_wait_queue_exclusive(sk->sk_sleep, &wait);
-	for (;;) {
-		__set_current_state(TASK_INTERRUPTIBLE);
-		if (sk->sk_shutdown & RCV_SHUTDOWN)
-			break;
-		/*
-		 * Well, if we have backlog, try to process it now.
-		 */
-                if (sk->sk_backlog.tail) {
-			release_sock(sk);
-			lock_sock(sk);
-		}
+	while (1) {
+		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
 		rc = 0;
-		if (skb_queue_empty(&sk->sk_receive_queue)) {
-			release_sock(sk);
-			timeout = schedule_timeout(timeout);
-			lock_sock(sk);
-		} else
+		if (sk_wait_event(sk, &timeout,
+				  (sk->sk_shutdown & RCV_SHUTDOWN) ||
+				  (!llc_data_accept_state(llc->state) &&
+				   !llc->p_flag)))
 			break;
 		rc = -ERESTARTSYS;
 		if (signal_pending(current))
@@ -571,40 +551,35 @@ static int llc_ui_wait_for_data(struct sock *sk, int timeout)
 		if (!timeout)
 			break;
 	}
-	__set_current_state(TASK_RUNNING);
-	remove_wait_queue(sk->sk_sleep, &wait);
+	finish_wait(sk->sk_sleep, &wait);
 	return rc;
 }
 
-static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout)
+static int llc_wait_data(struct sock *sk, long timeo)
 {
-	DECLARE_WAITQUEUE(wait, current);
-	struct llc_sock *llc = llc_sk(sk);
 	int rc;
 
-	add_wait_queue_exclusive(sk->sk_sleep, &wait);
-	for (;;) {
-		dprintk("%s: looping...\n", __FUNCTION__);
-		__set_current_state(TASK_INTERRUPTIBLE);
-		rc = -ENOTCONN;
-		if (sk->sk_shutdown & RCV_SHUTDOWN)
+	while (1) {
+		/*
+		 * POSIX 1003.1g mandates this order.
+		 */
+		if (sk->sk_err) {
+			rc = sock_error(sk);
 			break;
+		}
 		rc = 0;
-		if (llc_data_accept_state(llc->state) || llc->p_flag) {
-			release_sock(sk);
-			timeout = schedule_timeout(timeout);
-			lock_sock(sk);
-		} else
+		if (sk->sk_shutdown & RCV_SHUTDOWN)
 			break;
-		rc = -ERESTARTSYS;
+		rc = -EAGAIN;
+		if (!timeo)
+			break;
+		rc = sock_intr_errno(timeo);
 		if (signal_pending(current))
 			break;
-		rc = -EAGAIN;
-		if (!timeout)
+		rc = 0;
+		if (sk_wait_data(sk, &timeo))
 			break;
 	}
-	__set_current_state(TASK_RUNNING);
-	remove_wait_queue(sk->sk_sleep, &wait);
 	return rc;
 }
 
@@ -627,15 +602,18 @@ static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
 	dprintk("%s: accepting on %02X\n", __FUNCTION__,
 	        llc_sk(sk)->laddr.lsap);
 	lock_sock(sk);
-	if (sk->sk_type != SOCK_STREAM)
+	if (unlikely(sk->sk_type != SOCK_STREAM))
 		goto out;
 	rc = -EINVAL;
-	if (sock->state != SS_UNCONNECTED || sk->sk_state != TCP_LISTEN)
+	if (unlikely(sock->state != SS_UNCONNECTED ||
+		     sk->sk_state != TCP_LISTEN))
 		goto out;
 	/* wait for a connection to arrive. */
-	rc = llc_ui_wait_for_data(sk, sk->sk_rcvtimeo);
-	if (rc)
-		goto out;
+	if (skb_queue_empty(&sk->sk_receive_queue)) {
+		rc = llc_wait_data(sk, sk->sk_rcvtimeo);
+		if (rc)
+			goto out;
+	}
 	dprintk("%s: got a new connection on %02X\n", __FUNCTION__,
 	        llc_sk(sk)->laddr.lsap);
 	skb = skb_dequeue(&sk->sk_receive_queue);
@@ -657,7 +635,6 @@ static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
 	/* put original socket back into a clean listen state. */
 	sk->sk_state = TCP_LISTEN;
 	sk->sk_ack_backlog--;
-	skb->sk = NULL;
 	dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__,
 		llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
 frees:
@@ -671,56 +648,167 @@ out:
  *	llc_ui_recvmsg - copy received data to the socket user.
  *	@sock: Socket to copy data from.
  *	@msg: Various user space related information.
- *	@size: Size of user buffer.
+ *	@len: Size of user buffer.
  *	@flags: User specified flags.
  *
  *	Copy received data to the socket user.
  *	Returns non-negative upon success, negative otherwise.
  */
 static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
-			  struct msghdr *msg, size_t size, int flags)
+			  struct msghdr *msg, size_t len, int flags)
 {
-	struct sock *sk = sock->sk;
 	struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
-	struct sk_buff *skb;
+	const int nonblock = flags & MSG_DONTWAIT;
+	struct sk_buff *skb = NULL;
+	struct sock *sk = sock->sk;
+	struct llc_sock *llc = llc_sk(sk);
 	size_t copied = 0;
-	int rc = -ENOMEM, timeout;
-	int noblock = flags & MSG_DONTWAIT;
+	u32 peek_seq = 0;
+	u32 *seq;
+	unsigned long used;
+	int target;	/* Read at least this many bytes */
+	long timeo;
 
-	dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__,
-		llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
 	lock_sock(sk);
-	timeout = sock_rcvtimeo(sk, noblock);
-	rc = llc_ui_wait_for_data(sk, timeout);
-	if (rc) {
-		dprintk("%s: llc_ui_wait_for_data failed recv "
-			"in %02X from %02X\n", __FUNCTION__,
-			llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
+	copied = -ENOTCONN;
+	if (sk->sk_state == TCP_LISTEN)
 		goto out;
-	}
-	skb = skb_dequeue(&sk->sk_receive_queue);
-	if (!skb) /* shutdown */
-		goto out;
-	copied = skb->len;
-	if (copied > size)
-		copied = size;
-	rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
-	if (rc)
-		goto dgram_free;
-	if (skb->len > copied) {
-		skb_pull(skb, copied);
-		skb_queue_head(&sk->sk_receive_queue, skb);
-	}
-	if (uaddr)
-		memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
-	msg->msg_namelen = sizeof(*uaddr);
-	if (!skb->next) {
-dgram_free:
-		kfree_skb(skb);
-	}
+
+	timeo = sock_rcvtimeo(sk, nonblock);
+
+	seq = &llc->copied_seq;
+	if (flags & MSG_PEEK) {
+		peek_seq = llc->copied_seq;
+		seq = &peek_seq;
+ 	}
+
+	target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
+	copied = 0;
+
+	do {
+		u32 offset;
+
+		/*
+		 * We need to check signals first, to get correct SIGURG
+		 * handling. FIXME: Need to check this doesn't impact 1003.1g
+		 * and move it down to the bottom of the loop
+		 */
+		if (signal_pending(current)) {
+			if (copied)
+				break;
+			copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
+			break;
+		}
+
+		/* Next get a buffer. */
+
+		skb = skb_peek(&sk->sk_receive_queue);
+		if (skb) {
+			offset = *seq;
+			goto found_ok_skb;
+		}
+		/* Well, if we have backlog, try to process it now yet. */
+
+		if (copied >= target && !sk->sk_backlog.tail)
+			break;
+
+		if (copied) {
+			if (sk->sk_err ||
+			    sk->sk_state == TCP_CLOSE ||
+			    (sk->sk_shutdown & RCV_SHUTDOWN) ||
+			    !timeo ||
+			    (flags & MSG_PEEK))
+				break;
+		} else {
+			if (sock_flag(sk, SOCK_DONE))
+				break;
+
+			if (sk->sk_err) {
+				copied = sock_error(sk);
+				break;
+			}
+			if (sk->sk_shutdown & RCV_SHUTDOWN)
+				break;
+
+			if (sk->sk_state == TCP_CLOSE) {
+				if (!sock_flag(sk, SOCK_DONE)) {
+					/*
+					 * This occurs when user tries to read
+					 * from never connected socket.
+					 */
+					copied = -ENOTCONN;
+					break;
+				}
+				break;
+			}
+			if (!timeo) {
+				copied = -EAGAIN;
+				break;
+			}
+		}
+
+		if (copied >= target) { /* Do not sleep, just process backlog. */
+			release_sock(sk);
+			lock_sock(sk);
+		} else
+			sk_wait_data(sk, &timeo);
+
+		if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
+			if (net_ratelimit())
+				printk(KERN_DEBUG "LLC(%s:%d): Application "
+						  "bug, race in MSG_PEEK.\n",
+				       current->comm, current->pid);
+			peek_seq = llc->copied_seq;
+		}
+		continue;
+	found_ok_skb:
+		/* Ok so how much can we use? */
+		used = skb->len - offset;
+		if (len < used)
+			used = len;
+
+		if (!(flags & MSG_TRUNC)) {
+			int rc = skb_copy_datagram_iovec(skb, offset,
+							 msg->msg_iov, used);
+			if (rc) {
+				/* Exception. Bailout! */
+				if (!copied)
+					copied = -EFAULT;
+				break;
+			}
+		}
+
+		*seq += used;
+		copied += used;
+		len -= used;
+
+		if (used + offset < skb->len)
+			continue;
+
+		if (!(flags & MSG_PEEK)) {
+			sk_eat_skb(sk, skb);
+			*seq = 0;
+		}
+	} while (len > 0);
+
+	/* 
+	 * According to UNIX98, msg_name/msg_namelen are ignored
+	 * on connected socket. -ANK
+	 * But... af_llc still doesn't have separate sets of methods for
+	 * SOCK_DGRAM and SOCK_STREAM :-( So we have to do this test, will
+	 * eventually fix this tho :-) -acme
+	 */
+	if (sk->sk_type == SOCK_DGRAM)
+		goto copy_uaddr;
 out:
 	release_sock(sk);
-	return rc ? : copied;
+	return copied;
+copy_uaddr:
+	if (uaddr != NULL && skb != NULL) {
+		memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
+		msg->msg_namelen = sizeof(*uaddr);
+	}
+	goto out;
 }
 
 /**
@@ -740,7 +828,6 @@ static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
 	struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
 	int flags = msg->msg_flags;
 	int noblock = flags & MSG_DONTWAIT;
-	struct net_device *dev;
 	struct sk_buff *skb;
 	size_t size = 0;
 	int rc = -EINVAL, copied = 0, hdrlen;
@@ -763,19 +850,17 @@ static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
 		if (rc)
 			goto release;
 	}
-	dev = llc->dev;
-	hdrlen = dev->hard_header_len + llc_ui_header_len(sk, addr);
+	hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
 	size = hdrlen + len;
-	if (size > dev->mtu)
-		size = dev->mtu;
+	if (size > llc->dev->mtu)
+		size = llc->dev->mtu;
 	copied = size - hdrlen;
 	release_sock(sk);
 	skb = sock_alloc_send_skb(sk, size, noblock, &rc);
 	lock_sock(sk);
 	if (!skb)
 		goto release;
-	skb->sk	      = sk;
-	skb->dev      = dev;
+	skb->dev      = llc->dev;
 	skb->protocol = llc_proto_type(addr->sllc_arphrd);
 	skb_reserve(skb, hdrlen); 
 	rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
@@ -800,15 +885,13 @@ static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
 	if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
 		goto out;
 	rc = llc_ui_send_data(sk, skb, noblock);
-	if (rc)
-		dprintk("%s: llc_ui_send_data failed: %d\n", __FUNCTION__, rc);
 out:
-	if (rc)
+	if (rc) {
 		kfree_skb(skb);
 release:
-	if (rc)
 		dprintk("%s: failed sending from %02X to %02X: %d\n",
 			__FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc);
+	}
 	release_sock(sk);
 	return rc ? : copied;
 }
@@ -895,7 +978,7 @@ static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
 	int rc = -EINVAL, opt;
 
 	lock_sock(sk);
-	if (level != SOL_LLC || optlen != sizeof(int))
+	if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
 		goto out;
 	rc = get_user(opt, (int __user *)optval);
 	if (rc)
@@ -915,22 +998,22 @@ static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
 	case LLC_OPT_ACK_TMR_EXP:
 		if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
 			goto out;
-		llc->ack_timer.expire = opt;
+		llc->ack_timer.expire = opt * HZ;
 		break;
 	case LLC_OPT_P_TMR_EXP:
 		if (opt > LLC_OPT_MAX_P_TMR_EXP)
 			goto out;
-		llc->pf_cycle_timer.expire = opt;
+		llc->pf_cycle_timer.expire = opt * HZ;
 		break;
 	case LLC_OPT_REJ_TMR_EXP:
 		if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
 			goto out;
-		llc->rej_sent_timer.expire = opt;
+		llc->rej_sent_timer.expire = opt * HZ;
 		break;
 	case LLC_OPT_BUSY_TMR_EXP:
 		if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
 			goto out;
-		llc->busy_state_timer.expire = opt;
+		llc->busy_state_timer.expire = opt * HZ;
 		break;
 	case LLC_OPT_TX_WIN:
 		if (opt > LLC_OPT_MAX_WIN)
@@ -970,7 +1053,7 @@ static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
 	int val = 0, len = 0, rc = -EINVAL;
 
 	lock_sock(sk);
-	if (level != SOL_LLC)
+	if (unlikely(level != SOL_LLC))
 		goto out;
 	rc = get_user(len, optlen);
 	if (rc)
@@ -980,17 +1063,17 @@ static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
 		goto out;
 	switch (optname) {
 	case LLC_OPT_RETRY:
-		val = llc->n2;				break;
+		val = llc->n2;					break;
 	case LLC_OPT_SIZE:
-		val = llc->n1;				break;
+		val = llc->n1;					break;
 	case LLC_OPT_ACK_TMR_EXP:
-		val = llc->ack_timer.expire;		break;
+		val = llc->ack_timer.expire / HZ;		break;
 	case LLC_OPT_P_TMR_EXP:
-		val = llc->pf_cycle_timer.expire;	break;
+		val = llc->pf_cycle_timer.expire / HZ;		break;
 	case LLC_OPT_REJ_TMR_EXP:
-		val = llc->rej_sent_timer.expire;	break;
+		val = llc->rej_sent_timer.expire / HZ;		break;
 	case LLC_OPT_BUSY_TMR_EXP:
-		val = llc->busy_state_timer.expire;	break;
+		val = llc->busy_state_timer.expire / HZ;	break;
 	case LLC_OPT_TX_WIN:
 		val = llc->k;				break;
 	case LLC_OPT_RX_WIN:
@@ -1034,8 +1117,12 @@ static struct proto_ops llc_ui_ops = {
 	.sendpage    = sock_no_sendpage,
 };
 
-extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
-extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
+static char llc_proc_err_msg[] __initdata =
+        KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
+static char llc_sysctl_err_msg[] __initdata =
+        KERN_CRIT "LLC: Unable to register the sysctl entries\n";
+static char llc_sock_err_msg[] __initdata =
+        KERN_CRIT "LLC: Unable to register the network family\n";
 
 static int __init llc2_init(void)
 {
@@ -1048,13 +1135,28 @@ static int __init llc2_init(void)
 	llc_station_init();
 	llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
 	rc = llc_proc_init();
-	if (rc != 0)
+	if (rc != 0) {
+		printk(llc_proc_err_msg);
 		goto out_unregister_llc_proto;
-	sock_register(&llc_ui_family_ops);
+	}
+	rc = llc_sysctl_init();
+	if (rc) {
+		printk(llc_sysctl_err_msg);
+		goto out_proc;
+	}
+	rc = sock_register(&llc_ui_family_ops);
+	if (rc) {
+		printk(llc_sock_err_msg);
+		goto out_sysctl;
+	}
 	llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
 	llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
 out:
 	return rc;
+out_sysctl:
+	llc_sysctl_exit();
+out_proc:
+	llc_proc_exit();
 out_unregister_llc_proto:
 	proto_unregister(&llc_proto);
 	goto out;
@@ -1067,6 +1169,7 @@ static void __exit llc2_exit(void)
 	llc_remove_pack(LLC_DEST_CONN);
 	sock_unregister(PF_LLC);
 	llc_proc_exit();
+	llc_sysctl_exit();
 	proto_unregister(&llc_proto);
 }
 
diff --git a/net/llc/llc_c_ac.c b/net/llc/llc_c_ac.c
index b218be4c10ec..b0bcfb1f12dd 100644
--- a/net/llc/llc_c_ac.c
+++ b/net/llc/llc_c_ac.c
@@ -60,23 +60,10 @@ int llc_conn_ac_clear_remote_busy(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ac_conn_ind(struct sock *sk, struct sk_buff *skb)
 {
-	int rc = -ENOTCONN;
-	u8 dsap;
-	struct llc_sap *sap;
-
-	llc_pdu_decode_dsap(skb, &dsap);
-	sap = llc_sap_find(dsap);
-	if (sap) {
-		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
-		struct llc_sock *llc = llc_sk(sk);
+	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
-		llc_pdu_decode_sa(skb, llc->daddr.mac);
-		llc_pdu_decode_da(skb, llc->laddr.mac);
-		llc->dev = skb->dev;
-		ev->ind_prim = LLC_CONN_PRIM;
-		rc = 0;
-	}
-	return rc;
+	ev->ind_prim = LLC_CONN_PRIM;
+	return 0;
 }
 
 int llc_conn_ac_conn_confirm(struct sock *sk, struct sk_buff *skb)
@@ -120,10 +107,8 @@ int llc_conn_ac_disc_ind(struct sock *sk, struct sk_buff *skb)
 			reason = LLC_DISC_REASON_RX_DISC_CMD_PDU;
 	} else if (ev->type == LLC_CONN_EV_TYPE_ACK_TMR)
 		reason = LLC_DISC_REASON_ACK_TMR_EXP;
-	else {
-		reason = 0;
+	else
 		rc = -EINVAL;
-	}
 	if (!rc) {
 		ev->reason   = reason;
 		ev->ind_prim = LLC_DISC_PRIM;
@@ -160,9 +145,6 @@ int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
 			   LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME) {
 			reason = LLC_RESET_REASON_REMOTE;
 			rc = 0;
-		} else {
-			reason = 0;
-			rc  = 1;
 		}
 		break;
 	case LLC_CONN_EV_TYPE_ACK_TMR:
@@ -172,8 +154,7 @@ int llc_conn_ac_rst_ind(struct sock *sk, struct sk_buff *skb)
 		if (llc->retry_count > llc->n2) {
 			reason = LLC_RESET_REASON_LOCAL;
 			rc = 0;
-		} else
-			rc = 1;
+		}
 		break;
 	}
 	if (!rc) {
@@ -217,18 +198,17 @@ int llc_conn_ac_stop_rej_tmr_if_data_flag_eq_2(struct sock *sk,
 int llc_conn_ac_send_disc_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_disc_cmd(nskb, 1);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 		llc_conn_ac_set_p_flag_1(sk, skb);
@@ -243,20 +223,19 @@ free:
 int llc_conn_ac_send_dm_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		u8 f_bit;
 
-		nskb->dev = llc->dev;
 		llc_pdu_decode_pf_bit(skb, &f_bit);
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_dm_rsp(nskb, f_bit);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -270,19 +249,17 @@ free:
 int llc_conn_ac_send_dm_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
-		u8 f_bit = 1;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
-		llc_pdu_init_as_dm_rsp(nskb, f_bit);
+		llc_pdu_init_as_dm_rsp(nskb, 1);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -306,17 +283,16 @@ int llc_conn_ac_send_frmr_rsp_f_set_x(struct sock *sk, struct sk_buff *skb)
 		llc_pdu_decode_pf_bit(skb, &f_bit);
 	else
 		f_bit = 0;
-	nskb = llc_alloc_frame();
+	nskb = llc_alloc_frame(sk, llc->dev);
 	if (nskb) {
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
 					 llc->vR, INCORRECT);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -330,21 +306,19 @@ free:
 int llc_conn_ac_resend_frmr_rsp_f_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		u8 f_bit = 0;
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		struct llc_pdu_sn *pdu = (struct llc_pdu_sn *)&llc->rx_pdu_hdr;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
-		llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
+		llc_pdu_init_as_frmr_rsp(nskb, pdu, 0, llc->vS,
 					 llc->vR, INCORRECT);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -360,21 +334,20 @@ int llc_conn_ac_resend_frmr_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
 	u8 f_bit;
 	int rc = -ENOBUFS;
 	struct sk_buff *nskb;
+	struct llc_sock *llc = llc_sk(sk);
 
 	llc_pdu_decode_pf_bit(skb, &f_bit);
-	nskb = llc_alloc_frame();
+	nskb = llc_alloc_frame(sk, llc->dev);
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_frmr_rsp(nskb, pdu, f_bit, llc->vS,
 					 llc->vR, INCORRECT);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -395,7 +368,7 @@ int llc_conn_ac_send_i_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
 			    llc->daddr.lsap, LLC_PDU_CMD);
 	llc_pdu_init_as_i_cmd(skb, 1, llc->vS, llc->vR);
 	rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
-	if (!rc) {
+	if (likely(!rc)) {
 		llc_conn_send_pdu(sk, skb);
 		llc_conn_ac_inc_vs_by_1(sk, skb);
 	}
@@ -412,7 +385,7 @@ static int llc_conn_ac_send_i_cmd_p_set_0(struct sock *sk, struct sk_buff *skb)
 			    llc->daddr.lsap, LLC_PDU_CMD);
 	llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
 	rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
-	if (!rc) {
+	if (likely(!rc)) {
 		llc_conn_send_pdu(sk, skb);
 		llc_conn_ac_inc_vs_by_1(sk, skb);
 	}
@@ -429,7 +402,7 @@ int llc_conn_ac_send_i_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 			    llc->daddr.lsap, LLC_PDU_CMD);
 	llc_pdu_init_as_i_cmd(skb, 0, llc->vS, llc->vR);
 	rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
-	if (!rc) {
+	if (likely(!rc)) {
 		llc_conn_send_pdu(sk, skb);
 		llc_conn_ac_inc_vs_by_1(sk, skb);
 	}
@@ -451,18 +424,17 @@ int llc_conn_ac_resend_i_xxx_x_set_0_or_send_rr(struct sock *sk,
 	u8 nr;
 	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (!rc)
+		if (likely(!rc))
 			llc_conn_send_pdu(sk, nskb);
 		else
 			kfree_skb(skb);
@@ -487,18 +459,17 @@ int llc_conn_ac_resend_i_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ac_send_rej_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_rej_cmd(nskb, 1, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -512,19 +483,17 @@ free:
 int llc_conn_ac_send_rej_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		u8 f_bit = 1;
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
-		llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
+		llc_pdu_init_as_rej_rsp(nskb, 1, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -538,19 +507,17 @@ free:
 int llc_conn_ac_send_rej_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
-		u8 f_bit = 0;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
-		llc_pdu_init_as_rej_rsp(nskb, f_bit, llc->vR);
+		llc_pdu_init_as_rej_rsp(nskb, 0, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -564,18 +531,17 @@ free:
 int llc_conn_ac_send_rnr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_rnr_cmd(nskb, 1, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -589,19 +555,17 @@ free:
 int llc_conn_ac_send_rnr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
-		u8 f_bit = 1;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
-		llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
+		llc_pdu_init_as_rnr_rsp(nskb, 1, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -615,19 +579,17 @@ free:
 int llc_conn_ac_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		u8 f_bit = 0;
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
-		llc_pdu_init_as_rnr_rsp(nskb, f_bit, llc->vR);
+		llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -645,7 +607,7 @@ int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
 	if (!llc->remote_busy_flag) {
 		llc->remote_busy_flag = 1;
 		mod_timer(&llc->busy_state_timer.timer,
-			 jiffies + llc->busy_state_timer.expire * HZ);
+			 jiffies + llc->busy_state_timer.expire);
 	}
 	return 0;
 }
@@ -653,18 +615,17 @@ int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ac_opt_send_rnr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rnr_rsp(nskb, 0, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -678,18 +639,17 @@ free:
 int llc_conn_ac_send_rr_cmd_p_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_rr_cmd(nskb, 1, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -703,19 +663,18 @@ free:
 int llc_conn_ac_send_rr_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 		u8 f_bit = 1;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -729,19 +688,17 @@ free:
 int llc_conn_ac_send_ack_rsp_f_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
-		u8 f_bit = 1;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
-		llc_pdu_init_as_rr_rsp(nskb, f_bit, llc->vR);
+		llc_pdu_init_as_rr_rsp(nskb, 1, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -755,18 +712,17 @@ free:
 int llc_conn_ac_send_rr_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -780,18 +736,17 @@ free:
 int llc_conn_ac_send_ack_xxx_x_set_0(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, 0, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -815,8 +770,8 @@ void llc_conn_set_p_flag(struct sock *sk, u8 value)
 int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
 	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
 		struct llc_sap *sap = llc->sap;
@@ -824,12 +779,11 @@ int llc_conn_ac_send_sabme_cmd_p_set_x(struct sock *sk, struct sk_buff *skb)
 
 		if (llc->dev->flags & IFF_LOOPBACK)
 			dmac = llc->dev->dev_addr;
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_CMD);
 		llc_pdu_init_as_sabme_cmd(nskb, 1);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, dmac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 		llc_conn_set_p_flag(sk, 1);
@@ -845,11 +799,11 @@ int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
 {
 	u8 f_bit;
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	llc_pdu_decode_pf_bit(skb, &f_bit);
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
 		nskb->dev = llc->dev;
@@ -857,7 +811,7 @@ int llc_conn_ac_send_ua_rsp_f_set_p(struct sock *sk, struct sk_buff *skb)
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_ua_rsp(nskb, f_bit);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -886,7 +840,7 @@ int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
 
 	llc_conn_set_p_flag(sk, 1);
 	mod_timer(&llc->pf_cycle_timer.timer,
-		  jiffies + llc->pf_cycle_timer.expire * HZ);
+		  jiffies + llc->pf_cycle_timer.expire);
 	return 0;
 }
 
@@ -957,7 +911,7 @@ static int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock *sk,
 			    llc->daddr.lsap, LLC_PDU_RSP);
 	llc_pdu_init_as_i_cmd(skb, llc->ack_pf, llc->vS, llc->vR);
 	rc = llc_mac_hdr_init(skb, llc->dev->dev_addr, llc->daddr.mac);
-	if (!rc) {
+	if (likely(!rc)) {
 		llc_conn_send_pdu(sk, skb);
 		llc_conn_ac_inc_vs_by_1(sk, skb);
 	}
@@ -1001,18 +955,17 @@ static int llc_conn_ac_send_rr_rsp_f_set_ackpf(struct sock *sk,
 					       struct sk_buff *skb)
 {
 	int rc = -ENOBUFS;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct llc_sock *llc = llc_sk(sk);
+	struct sk_buff *nskb = llc_alloc_frame(sk, llc->dev);
 
 	if (nskb) {
-		struct llc_sock *llc = llc_sk(sk);
 		struct llc_sap *sap = llc->sap;
 
-		nskb->dev = llc->dev;
 		llc_pdu_header_init(nskb, LLC_PDU_TYPE_S, sap->laddr.lsap,
 				    llc->daddr.lsap, LLC_PDU_RSP);
 		llc_pdu_init_as_rr_rsp(nskb, llc->ack_pf, llc->vR);
 		rc = llc_mac_hdr_init(nskb, llc->dev->dev_addr, llc->daddr.mac);
-		if (rc)
+		if (unlikely(rc))
 			goto free;
 		llc_conn_send_pdu(sk, nskb);
 	}
@@ -1165,7 +1118,7 @@ int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
 {
 	struct llc_sock *llc = llc_sk(sk);
 
-	mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire * HZ);
+	mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire);
 	return 0;
 }
 
@@ -1174,7 +1127,7 @@ int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
 	struct llc_sock *llc = llc_sk(sk);
 
 	mod_timer(&llc->rej_sent_timer.timer,
-		  jiffies + llc->rej_sent_timer.expire * HZ);
+		  jiffies + llc->rej_sent_timer.expire);
 	return 0;
 }
 
@@ -1185,7 +1138,7 @@ int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
 
 	if (!timer_pending(&llc->ack_timer.timer))
 		mod_timer(&llc->ack_timer.timer,
-			  jiffies + llc->ack_timer.expire * HZ);
+			  jiffies + llc->ack_timer.expire);
 	return 0;
 }
 
@@ -1233,7 +1186,7 @@ int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
 		}
 		if (unacked)
 			mod_timer(&llc->ack_timer.timer,
-				  jiffies + llc->ack_timer.expire * HZ);
+				  jiffies + llc->ack_timer.expire);
 	} else if (llc->failed_data_req) {
 		u8 f_bit;
 
@@ -1354,13 +1307,13 @@ int llc_conn_ac_set_vs_nr(struct sock *sk, struct sk_buff *skb)
 	return 0;
 }
 
-int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
+static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb)
 {
 	llc_sk(sk)->vS = (llc_sk(sk)->vS + 1) % 128;
 	return 0;
 }
 
-void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
+static void llc_conn_tmr_common_cb(unsigned long timeout_data, u8 type)
 {
 	struct sock *sk = (struct sock *)timeout_data;
 	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
@@ -1369,59 +1322,31 @@ void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
 	if (skb) {
 		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
-		skb->sk  = sk;
-		ev->type = LLC_CONN_EV_TYPE_P_TMR;
+		skb_set_owner_r(skb, sk);
+		ev->type = type;
 		llc_process_tmr_ev(sk, skb);
 	}
 	bh_unlock_sock(sk);
 }
 
-void llc_conn_busy_tmr_cb(unsigned long timeout_data)
+void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
 {
-	struct sock *sk = (struct sock *)timeout_data;
-	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
-
-	bh_lock_sock(sk);
-	if (skb) {
-		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_P_TMR);
+}
 
-		skb->sk  = sk;
-		ev->type = LLC_CONN_EV_TYPE_BUSY_TMR;
-		llc_process_tmr_ev(sk, skb);
-	}
-	bh_unlock_sock(sk);
+void llc_conn_busy_tmr_cb(unsigned long timeout_data)
+{
+	llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_BUSY_TMR);
 }
 
 void llc_conn_ack_tmr_cb(unsigned long timeout_data)
 {
-	struct sock* sk = (struct sock *)timeout_data;
-	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
-
-	bh_lock_sock(sk);
-	if (skb) {
-		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
-
-		skb->sk  = sk;
-		ev->type = LLC_CONN_EV_TYPE_ACK_TMR;
-		llc_process_tmr_ev(sk, skb);
-	}
-	bh_unlock_sock(sk);
+	llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_ACK_TMR);
 }
 
 void llc_conn_rej_tmr_cb(unsigned long timeout_data)
 {
-	struct sock *sk = (struct sock *)timeout_data;
-	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
-
-	bh_lock_sock(sk);
-	if (skb) {
-		struct llc_conn_state_ev *ev = llc_conn_ev(skb);
-
-		skb->sk  = sk;
-		ev->type = LLC_CONN_EV_TYPE_REJ_TMR;
-		llc_process_tmr_ev(sk, skb);
-	}
-	bh_unlock_sock(sk);
+	llc_conn_tmr_common_cb(timeout_data, LLC_CONN_EV_TYPE_REJ_TMR);
 }
 
 int llc_conn_ac_rst_vs(struct sock *sk, struct sk_buff *skb)
diff --git a/net/llc/llc_c_ev.c b/net/llc/llc_c_ev.c
index d5bdb53a348f..c5deda246614 100644
--- a/net/llc/llc_c_ev.c
+++ b/net/llc/llc_c_ev.c
@@ -37,6 +37,7 @@
 #include <net/llc_conn.h>
 #include <net/llc_sap.h>
 #include <net/sock.h>
+#include <net/llc_c_ac.h>
 #include <net/llc_c_ev.h>
 #include <net/llc_pdu.h>
 
@@ -46,8 +47,6 @@
 #define dprintk(args...)
 #endif
 
-extern u16 llc_circular_between(u8 a, u8 b, u8 c);
-
 /**
  *	llc_util_ns_inside_rx_window - check if sequence number is in rx window
  *	@ns: sequence number of received pdu.
@@ -99,7 +98,7 @@ out:
 
 int llc_conn_ev_conn_req(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->prim == LLC_CONN_PRIM &&
 	       ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
@@ -107,7 +106,7 @@ int llc_conn_ev_conn_req(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_data_req(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->prim == LLC_DATA_PRIM &&
 	       ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
@@ -115,7 +114,7 @@ int llc_conn_ev_data_req(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_disc_req(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->prim == LLC_DISC_PRIM &&
 	       ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
@@ -123,7 +122,7 @@ int llc_conn_ev_disc_req(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rst_req(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->prim == LLC_RESET_PRIM &&
 	       ev->prim_type == LLC_PRIM_TYPE_REQ ? 0 : 1;
@@ -131,7 +130,7 @@ int llc_conn_ev_rst_req(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_local_busy_detected(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
 	       ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_DETECTED ? 0 : 1;
@@ -139,7 +138,7 @@ int llc_conn_ev_local_busy_detected(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_local_busy_cleared(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
 	       ev->prim_type == LLC_CONN_EV_LOCAL_BUSY_CLEARED ? 0 : 1;
@@ -152,7 +151,7 @@ int llc_conn_ev_rx_bad_pdu(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_disc_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 	       LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_DISC ? 0 : 1;
@@ -160,7 +159,7 @@ int llc_conn_ev_rx_disc_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_dm_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 	       LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_DM ? 0 : 1;
@@ -168,7 +167,7 @@ int llc_conn_ev_rx_dm_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_frmr_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 	       LLC_U_PDU_RSP(pdu) == LLC_2_PDU_RSP_FRMR ? 0 : 1;
@@ -176,7 +175,7 @@ int llc_conn_ev_rx_frmr_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_i_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return llc_conn_space(sk, skb) &&
 	       LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
@@ -186,7 +185,7 @@ int llc_conn_ev_rx_i_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_i_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return llc_conn_space(sk, skb) &&
 	       LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
@@ -197,9 +196,9 @@ int llc_conn_ev_rx_i_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ev_rx_i_cmd_pbit_set_0_unexpd_ns(struct sock *sk,
 					      struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-	u8 vr = llc_sk(sk)->vR;
-	u8 ns = LLC_I_GET_NS(pdu);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const u8 vr = llc_sk(sk)->vR;
+	const u8 ns = LLC_I_GET_NS(pdu);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 	       LLC_I_PF_IS_0(pdu) && ns != vr &&
@@ -209,9 +208,9 @@ int llc_conn_ev_rx_i_cmd_pbit_set_0_unexpd_ns(struct sock *sk,
 int llc_conn_ev_rx_i_cmd_pbit_set_1_unexpd_ns(struct sock *sk,
 					      struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-	u8 vr = llc_sk(sk)->vR;
-	u8 ns = LLC_I_GET_NS(pdu);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const u8 vr = llc_sk(sk)->vR;
+	const u8 ns = LLC_I_GET_NS(pdu);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 	       LLC_I_PF_IS_1(pdu) && ns != vr &&
@@ -221,10 +220,11 @@ int llc_conn_ev_rx_i_cmd_pbit_set_1_unexpd_ns(struct sock *sk,
 int llc_conn_ev_rx_i_cmd_pbit_set_x_inval_ns(struct sock *sk,
 					     struct sk_buff *skb)
 {
-	struct llc_pdu_sn * pdu = llc_pdu_sn_hdr(skb);
-	u8 vr = llc_sk(sk)->vR;
-	u8 ns = LLC_I_GET_NS(pdu);
-	u16 rc = LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr &&
+	const struct llc_pdu_sn * pdu = llc_pdu_sn_hdr(skb);
+	const u8 vr = llc_sk(sk)->vR;
+	const u8 ns = LLC_I_GET_NS(pdu);
+	const u16 rc = LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
+		ns != vr &&
 		 llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 	if (!rc)
 		dprintk("%s: matched, state=%d, ns=%d, vr=%d\n",
@@ -234,7 +234,7 @@ int llc_conn_ev_rx_i_cmd_pbit_set_x_inval_ns(struct sock *sk,
 
 int llc_conn_ev_rx_i_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return llc_conn_space(sk, skb) &&
 	       LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
@@ -244,7 +244,7 @@ int llc_conn_ev_rx_i_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_i_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 	       LLC_I_PF_IS_1(pdu) &&
@@ -253,7 +253,7 @@ int llc_conn_ev_rx_i_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_i_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return llc_conn_space(sk, skb) &&
 	       LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
@@ -263,9 +263,9 @@ int llc_conn_ev_rx_i_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ev_rx_i_rsp_fbit_set_0_unexpd_ns(struct sock *sk,
 					      struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-	u8 vr = llc_sk(sk)->vR;
-	u8 ns = LLC_I_GET_NS(pdu);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const u8 vr = llc_sk(sk)->vR;
+	const u8 ns = LLC_I_GET_NS(pdu);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 	       LLC_I_PF_IS_0(pdu) && ns != vr &&
@@ -275,9 +275,9 @@ int llc_conn_ev_rx_i_rsp_fbit_set_0_unexpd_ns(struct sock *sk,
 int llc_conn_ev_rx_i_rsp_fbit_set_1_unexpd_ns(struct sock *sk,
 					      struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-	u8 vr = llc_sk(sk)->vR;
-	u8 ns = LLC_I_GET_NS(pdu);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const u8 vr = llc_sk(sk)->vR;
+	const u8 ns = LLC_I_GET_NS(pdu);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
 	       LLC_I_PF_IS_1(pdu) && ns != vr &&
@@ -287,9 +287,9 @@ int llc_conn_ev_rx_i_rsp_fbit_set_1_unexpd_ns(struct sock *sk,
 int llc_conn_ev_rx_i_rsp_fbit_set_x_unexpd_ns(struct sock *sk,
 					      struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-	u8 vr = llc_sk(sk)->vR;
-	u8 ns = LLC_I_GET_NS(pdu);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const u8 vr = llc_sk(sk)->vR;
+	const u8 ns = LLC_I_GET_NS(pdu);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr &&
 	       !llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
@@ -298,10 +298,11 @@ int llc_conn_ev_rx_i_rsp_fbit_set_x_unexpd_ns(struct sock *sk,
 int llc_conn_ev_rx_i_rsp_fbit_set_x_inval_ns(struct sock *sk,
 					     struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-	u8 vr = llc_sk(sk)->vR;
-	u8 ns = LLC_I_GET_NS(pdu);
-	u16 rc = LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) && ns != vr &&
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const u8 vr = llc_sk(sk)->vR;
+	const u8 ns = LLC_I_GET_NS(pdu);
+	const u16 rc = LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_I(pdu) &&
+		ns != vr &&
 		 llc_util_ns_inside_rx_window(ns, vr, llc_sk(sk)->rw) ? 0 : 1;
 	if (!rc)
 		dprintk("%s: matched, state=%d, ns=%d, vr=%d\n",
@@ -311,7 +312,7 @@ int llc_conn_ev_rx_i_rsp_fbit_set_x_inval_ns(struct sock *sk,
 
 int llc_conn_ev_rx_rej_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_0(pdu) &&
@@ -320,7 +321,7 @@ int llc_conn_ev_rx_rej_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rej_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_1(pdu) &&
@@ -329,7 +330,7 @@ int llc_conn_ev_rx_rej_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rej_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_0(pdu) &&
@@ -338,7 +339,7 @@ int llc_conn_ev_rx_rej_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rej_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_1(pdu) &&
@@ -347,7 +348,7 @@ int llc_conn_ev_rx_rej_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rej_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PDU_RSP(pdu) == LLC_2_PDU_RSP_REJ ? 0 : 1;
@@ -355,7 +356,7 @@ int llc_conn_ev_rx_rej_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rnr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_0(pdu) &&
@@ -364,7 +365,7 @@ int llc_conn_ev_rx_rnr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rnr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_1(pdu) &&
@@ -373,7 +374,7 @@ int llc_conn_ev_rx_rnr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rnr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_0(pdu) &&
@@ -382,7 +383,7 @@ int llc_conn_ev_rx_rnr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rnr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_1(pdu) &&
@@ -391,7 +392,7 @@ int llc_conn_ev_rx_rnr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_0(pdu) &&
@@ -400,7 +401,7 @@ int llc_conn_ev_rx_rr_cmd_pbit_set_0(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
 	       LLC_S_PF_IS_1(pdu) &&
@@ -409,7 +410,7 @@ int llc_conn_ev_rx_rr_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return llc_conn_space(sk, skb) &&
 	       LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
@@ -419,7 +420,7 @@ int llc_conn_ev_rx_rr_rsp_fbit_set_0(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_rr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	return llc_conn_space(sk, skb) &&
 	       LLC_PDU_IS_RSP(pdu) && LLC_PDU_TYPE_IS_S(pdu) &&
@@ -429,7 +430,7 @@ int llc_conn_ev_rx_rr_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_rx_sabme_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 
 	return LLC_PDU_IS_CMD(pdu) && LLC_PDU_TYPE_IS_U(pdu) &&
 	       LLC_U_PDU_CMD(pdu) == LLC_2_PDU_CMD_SABME ? 0 : 1;
@@ -446,7 +447,7 @@ int llc_conn_ev_rx_ua_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 {
 	u16 rc = 1;
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
 
 	if (LLC_PDU_IS_CMD(pdu)) {
 		if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) {
@@ -461,7 +462,7 @@ int llc_conn_ev_rx_xxx_cmd_pbit_set_1(struct sock *sk, struct sk_buff *skb)
 int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
 {
 	u16 rc = 1;
-	struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 
 	if (LLC_PDU_IS_CMD(pdu)) {
 		if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
@@ -477,32 +478,10 @@ int llc_conn_ev_rx_xxx_cmd_pbit_set_x(struct sock *sk, struct sk_buff *skb)
 	return rc;
 }
 
-int llc_conn_ev_rx_xxx_rsp_fbit_set_1(struct sock *sk, struct sk_buff *skb)
-{
-	u16 rc = 1;
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-
-	if (LLC_PDU_IS_RSP(pdu)) {
-		if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) {
-			if (LLC_I_PF_IS_1(pdu))
-				rc = 0;
-		} else if (LLC_PDU_TYPE_IS_U(pdu))
-			switch (LLC_U_PDU_RSP(pdu)) {
-			case LLC_2_PDU_RSP_UA:
-			case LLC_2_PDU_RSP_DM:
-			case LLC_2_PDU_RSP_FRMR:
-				if (LLC_U_PF_IS_1(pdu))
-					rc = 0;
-				break;
-			}
-	}
-	return rc;
-}
-
 int llc_conn_ev_rx_xxx_rsp_fbit_set_x(struct sock *sk, struct sk_buff *skb)
 {
 	u16 rc = 1;
-	struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
+	const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
 
 	if (LLC_PDU_IS_RSP(pdu)) {
 		if (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu))
@@ -524,9 +503,9 @@ int llc_conn_ev_rx_zzz_cmd_pbit_set_x_inval_nr(struct sock *sk,
 					       struct sk_buff *skb)
 {
 	u16 rc = 1;
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-	u8 vs = llc_sk(sk)->vS;
-	u8 nr = LLC_I_GET_NR(pdu);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const u8 vs = llc_sk(sk)->vS;
+	const u8 nr = LLC_I_GET_NR(pdu);
 
 	if (LLC_PDU_IS_CMD(pdu) &&
 	    (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
@@ -542,9 +521,9 @@ int llc_conn_ev_rx_zzz_rsp_fbit_set_x_inval_nr(struct sock *sk,
 					       struct sk_buff *skb)
 {
 	u16 rc = 1;
-	struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
-	u8 vs = llc_sk(sk)->vS;
-	u8 nr = LLC_I_GET_NR(pdu);
+	const struct llc_pdu_sn *pdu = llc_pdu_sn_hdr(skb);
+	const u8 vs = llc_sk(sk)->vS;
+	const u8 nr = LLC_I_GET_NR(pdu);
 
 	if (LLC_PDU_IS_RSP(pdu) &&
 	    (LLC_PDU_TYPE_IS_I(pdu) || LLC_PDU_TYPE_IS_S(pdu)) &&
@@ -563,28 +542,28 @@ int llc_conn_ev_rx_any_frame(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_p_tmr_exp(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->type != LLC_CONN_EV_TYPE_P_TMR;
 }
 
 int llc_conn_ev_ack_tmr_exp(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->type != LLC_CONN_EV_TYPE_ACK_TMR;
 }
 
 int llc_conn_ev_rej_tmr_exp(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->type != LLC_CONN_EV_TYPE_REJ_TMR;
 }
 
 int llc_conn_ev_busy_tmr_exp(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->type != LLC_CONN_EV_TYPE_BUSY_TMR;
 }
@@ -596,7 +575,7 @@ int llc_conn_ev_init_p_f_cycle(struct sock *sk, struct sk_buff *skb)
 
 int llc_conn_ev_tx_buffer_full(struct sock *sk, struct sk_buff *skb)
 {
-	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
+	const struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	return ev->type == LLC_CONN_EV_TYPE_SIMPLE &&
 	       ev->prim_type == LLC_CONN_EV_TX_BUFF_FULL ? 0 : 1;
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index 4c644bc70eae..042b24a8ca4c 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -40,6 +40,11 @@ static struct llc_conn_state_trans *llc_qualify_conn_ev(struct sock *sk,
 /* Offset table on connection states transition diagram */
 static int llc_offset_table[NBR_CONN_STATES][NBR_CONN_EV];
 
+int sysctl_llc2_ack_timeout = LLC2_ACK_TIME * HZ;
+int sysctl_llc2_p_timeout = LLC2_P_TIME * HZ;
+int sysctl_llc2_rej_timeout = LLC2_REJ_TIME * HZ;
+int sysctl_llc2_busy_timeout = LLC2_BUSY_TIME * HZ;
+
 /**
  *	llc_conn_state_process - sends event to connection state machine
  *	@sk: connection
@@ -53,7 +58,7 @@ static int llc_offset_table[NBR_CONN_STATES][NBR_CONN_EV];
 int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 {
 	int rc;
-	struct llc_sock *llc = llc_sk(sk);
+	struct llc_sock *llc = llc_sk(skb->sk);
 	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
 
 	/*
@@ -63,13 +68,16 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 	 */
 	skb_get(skb);
 	ev->ind_prim = ev->cfm_prim = 0;
-	rc = llc_conn_service(sk, skb); /* sending event to state machine */
-	if (rc) {
+	/*
+	 * Send event to state machine
+	 */
+	rc = llc_conn_service(skb->sk, skb);
+	if (unlikely(rc != 0)) {
 		printk(KERN_ERR "%s: llc_conn_service failed\n", __FUNCTION__);
 		goto out_kfree_skb;
 	}
 
-	if (!ev->ind_prim && !ev->cfm_prim) {
+	if (unlikely(!ev->ind_prim && !ev->cfm_prim)) {
 		/* indicate or confirm not required */
 		/* XXX this is not very pretty, perhaps we should store
 		 * XXX indicate/confirm-needed state in the llc_conn_state_ev
@@ -80,13 +88,13 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 		goto out_skb_put;
 	}
 
-	if (ev->ind_prim && ev->cfm_prim) /* Paranoia */
+	if (unlikely(ev->ind_prim && ev->cfm_prim)) /* Paranoia */
 		skb_get(skb);
 
 	switch (ev->ind_prim) {
 	case LLC_DATA_PRIM:
-		llc_save_primitive(skb, LLC_DATA_PRIM);
-		if (sock_queue_rcv_skb(sk, skb)) {
+		llc_save_primitive(sk, skb, LLC_DATA_PRIM);
+		if (unlikely(sock_queue_rcv_skb(sk, skb))) {
 			/*
 			 * shouldn't happen
 			 */
@@ -95,13 +103,14 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 			kfree_skb(skb);
 		}
 		break;
-	case LLC_CONN_PRIM: {
-		struct sock *parent = skb->sk;
-
-		skb->sk = sk;
-		skb_queue_tail(&parent->sk_receive_queue, skb);
-		sk->sk_state_change(parent);
-	}
+	case LLC_CONN_PRIM:
+		/*
+		 * Can't be sock_queue_rcv_skb, because we have to leave the
+		 * skb->sk pointing to the newly created struct sock in
+		 * llc_conn_handler. -acme
+		 */
+		skb_queue_tail(&sk->sk_receive_queue, skb);
+		sk->sk_state_change(sk);
 		break;
 	case LLC_DISC_PRIM:
 		sock_hold(sk);
@@ -111,8 +120,8 @@ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb)
 			sk->sk_socket->state  = SS_UNCONNECTED;
 			sk->sk_state          = TCP_CLOSE;
 			if (!sock_flag(sk, SOCK_DEAD)) {
-				sk->sk_state_change(sk);
 				sock_set_flag(sk, SOCK_DEAD);
+				sk->sk_state_change(sk);
 			}
 		}
 		kfree_skb(skb);
@@ -465,7 +474,7 @@ static int llc_exec_conn_trans_actions(struct sock *sk,
 }
 
 /**
- *	llc_lookup_established - Finds connection for the remote/local sap/mac
+ *	__llc_lookup_established - Finds connection for the remote/local sap/mac
  *	@sap: SAP
  *	@daddr: address of remote LLC (MAC + SAP)
  *	@laddr: address of local LLC (MAC + SAP)
@@ -473,14 +482,16 @@ static int llc_exec_conn_trans_actions(struct sock *sk,
  *	Search connection list of the SAP and finds connection using the remote
  *	mac, remote sap, local mac, and local sap. Returns pointer for
  *	connection found, %NULL otherwise.
+ *	Caller has to make sure local_bh is disabled.
  */
-struct sock *llc_lookup_established(struct llc_sap *sap, struct llc_addr *daddr,
-				    struct llc_addr *laddr)
+static struct sock *__llc_lookup_established(struct llc_sap *sap,
+					     struct llc_addr *daddr,
+					     struct llc_addr *laddr)
 {
 	struct sock *rc;
 	struct hlist_node *node;
 
-	read_lock_bh(&sap->sk_list.lock);
+	read_lock(&sap->sk_list.lock);
 	sk_for_each(rc, node, &sap->sk_list.list) {
 		struct llc_sock *llc = llc_sk(rc);
 
@@ -494,10 +505,22 @@ struct sock *llc_lookup_established(struct llc_sap *sap, struct llc_addr *daddr,
 	}
 	rc = NULL;
 found:
-	read_unlock_bh(&sap->sk_list.lock);
+	read_unlock(&sap->sk_list.lock);
 	return rc;
 }
 
+struct sock *llc_lookup_established(struct llc_sap *sap,
+				    struct llc_addr *daddr,
+				    struct llc_addr *laddr)
+{
+	struct sock *sk;
+
+	local_bh_disable();
+	sk = __llc_lookup_established(sap, daddr, laddr);
+	local_bh_enable();
+	return sk;
+}
+
 /**
  *	llc_lookup_listener - Finds listener for local MAC + SAP
  *	@sap: SAP
@@ -506,6 +529,7 @@ found:
  *	Search connection list of the SAP and finds connection listening on
  *	local mac, and local sap. Returns pointer for parent socket found,
  *	%NULL otherwise.
+ *	Caller has to make sure local_bh is disabled.
  */
 static struct sock *llc_lookup_listener(struct llc_sap *sap,
 					struct llc_addr *laddr)
@@ -513,7 +537,7 @@ static struct sock *llc_lookup_listener(struct llc_sap *sap,
 	struct sock *rc;
 	struct hlist_node *node;
 
-	read_lock_bh(&sap->sk_list.lock);
+	read_lock(&sap->sk_list.lock);
 	sk_for_each(rc, node, &sap->sk_list.list) {
 		struct llc_sock *llc = llc_sk(rc);
 
@@ -527,10 +551,19 @@ static struct sock *llc_lookup_listener(struct llc_sap *sap,
 	}
 	rc = NULL;
 found:
-	read_unlock_bh(&sap->sk_list.lock);
+	read_unlock(&sap->sk_list.lock);
 	return rc;
 }
 
+static struct sock *__llc_lookup(struct llc_sap *sap,
+				 struct llc_addr *daddr,
+				 struct llc_addr *laddr)
+{
+	struct sock *sk = __llc_lookup_established(sap, daddr, laddr);
+
+	return sk ? : llc_lookup_listener(sap, laddr);
+}
+
 /**
  *	llc_data_accept_state - designates if in this state data can be sent.
  *	@state: state of connection.
@@ -544,14 +577,14 @@ u8 llc_data_accept_state(u8 state)
 }
 
 /**
- *	find_next_offset - finds offset for next category of transitions
+ *	llc_find_next_offset - finds offset for next category of transitions
  *	@state: state table.
  *	@offset: start offset.
  *
  *	Finds offset of next category of transitions in transition table.
  *	Returns the start index of next category.
  */
-static u16 find_next_offset(struct llc_conn_state *state, u16 offset)
+static u16 __init llc_find_next_offset(struct llc_conn_state *state, u16 offset)
 {
 	u16 cnt = 0;
 	struct llc_conn_state_trans **next_trans;
@@ -578,8 +611,8 @@ void __init llc_build_offset_table(void)
 		next_offset = 0;
 		for (ev_type = 0; ev_type < NBR_CONN_EV; ev_type++) {
 			llc_offset_table[state][ev_type] = next_offset;
-			next_offset += find_next_offset(curr_state,
-							next_offset) + 1;
+			next_offset += llc_find_next_offset(curr_state,
+							    next_offset) + 1;
 		}
 	}
 }
@@ -623,6 +656,7 @@ static int llc_find_offset(int state, int ev_type)
  */
 void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk)
 {
+	llc_sap_hold(sap);
 	write_lock_bh(&sap->sk_list.lock);
 	llc_sk(sk)->sap = sap;
 	sk_add_node(sk, &sap->sk_list.list);
@@ -642,6 +676,7 @@ void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk)
 	write_lock_bh(&sap->sk_list.lock);
 	sk_del_node_init(sk);
 	write_unlock_bh(&sap->sk_list.lock);
+	llc_sap_put(sap);
 }
 
 /**
@@ -654,15 +689,34 @@ void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk)
 static int llc_conn_rcv(struct sock* sk, struct sk_buff *skb)
 {
 	struct llc_conn_state_ev *ev = llc_conn_ev(skb);
-	struct llc_sock *llc = llc_sk(sk);
 
-	if (!llc->dev)
-		llc->dev = skb->dev;
 	ev->type   = LLC_CONN_EV_TYPE_PDU;
 	ev->reason = 0;
 	return llc_conn_state_process(sk, skb);
 }
 
+static struct sock *llc_create_incoming_sock(struct sock *sk,
+					     struct net_device *dev,
+					     struct llc_addr *saddr,
+					     struct llc_addr *daddr)
+{
+	struct sock *newsk = llc_sk_alloc(sk->sk_family, GFP_ATOMIC,
+					  sk->sk_prot);
+	struct llc_sock *newllc, *llc = llc_sk(sk);
+
+	if (!newsk)
+		goto out;
+	newllc = llc_sk(newsk);
+	memcpy(&newllc->laddr, daddr, sizeof(newllc->laddr));
+	memcpy(&newllc->daddr, saddr, sizeof(newllc->daddr));
+	newllc->dev = dev;
+	dev_hold(dev);
+	llc_sap_add_socket(llc->sap, newsk);
+	llc_sap_hold(llc->sap);
+out:
+	return newsk;
+}
+
 void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
 {
 	struct llc_addr saddr, daddr;
@@ -673,35 +727,35 @@ void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
 	llc_pdu_decode_da(skb, daddr.mac);
 	llc_pdu_decode_dsap(skb, &daddr.lsap);
 
-	sk = llc_lookup_established(sap, &saddr, &daddr);
-	if (!sk) {
+	sk = __llc_lookup(sap, &saddr, &daddr);
+	if (!sk)
+		goto drop;
+
+	bh_lock_sock(sk);
+	/*
+	 * This has to be done here and not at the upper layer ->accept
+	 * method because of the way the PROCOM state machine works:
+	 * it needs to set several state variables (see, for instance,
+	 * llc_adm_actions_2 in net/llc/llc_c_st.c) and send a packet to
+	 * the originator of the new connection, and this state has to be
+	 * in the newly created struct sock private area. -acme
+	 */
+	if (unlikely(sk->sk_state == TCP_LISTEN)) {
+		struct sock *newsk = llc_create_incoming_sock(sk, skb->dev,
+							      &saddr, &daddr);
+		if (!newsk)
+			goto drop_unlock;
+		skb_set_owner_r(skb, newsk);
+	} else {
 		/*
-		 * Didn't find an active connection; verify if there
-		 * is a listening socket for this llc addr
+		 * Can't be skb_set_owner_r, this will be done at the
+		 * llc_conn_state_process function, later on, when we will use
+		 * skb_queue_rcv_skb to send it to upper layers, this is
+		 * another trick required to cope with how the PROCOM state
+		 * machine works. -acme
 		 */
-		struct llc_sock *llc;
-		struct sock *parent = llc_lookup_listener(sap, &daddr);
-
-		if (!parent) {
-			dprintk("llc_lookup_listener failed!\n");
-			goto drop;
-		}
-
-		sk = llc_sk_alloc(parent->sk_family, GFP_ATOMIC, parent->sk_prot);
-		if (!sk) {
-			sock_put(parent);
-			goto drop;
-		}
-		llc = llc_sk(sk);
-		memcpy(&llc->laddr, &daddr, sizeof(llc->laddr));
-		memcpy(&llc->daddr, &saddr, sizeof(llc->daddr));
-		llc_sap_add_socket(sap, sk);
-		sock_hold(sk);
-		sock_put(parent);
-		skb->sk = parent;
-	} else
 		skb->sk = sk;
-	bh_lock_sock(sk);
+	}
 	if (!sock_owned_by_user(sk))
 		llc_conn_rcv(sk, skb);
 	else {
@@ -709,11 +763,16 @@ void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb)
 		llc_set_backlog_type(skb, LLC_PACKET);
 		sk_add_backlog(sk, skb);
 	}
+out:
 	bh_unlock_sock(sk);
 	sock_put(sk);
 	return;
 drop:
 	kfree_skb(skb);
+	return;
+drop_unlock:
+	kfree_skb(skb);
+	goto out;
 }
 
 #undef LLC_REFCNT_DEBUG
@@ -722,32 +781,6 @@ static atomic_t llc_sock_nr;
 #endif
 
 /**
- *	llc_release_sockets - releases all sockets in a sap
- *	@sap: sap to release its sockets
- *
- *	Releases all connections of a sap. Returns 0 if all actions complete
- *	successfully, nonzero otherwise
- */
-int llc_release_sockets(struct llc_sap *sap)
-{
-	int rc = 0;
-	struct sock *sk;
-	struct hlist_node *node;
-
-	write_lock_bh(&sap->sk_list.lock);
-
-	sk_for_each(sk, node, &sap->sk_list.list) {
-		llc_sk(sk)->state = LLC_CONN_STATE_TEMP;
-
-		if (llc_send_disc(sk))
-			rc = 1;
-	}
-
-	write_unlock_bh(&sap->sk_list.lock);
-	return rc;
-}
-
-/**
  *	llc_backlog_rcv - Processes rx frames and expired timers.
  *	@sk: LLC sock (p8022 connection)
  *	@skb: queued rx frame or event
@@ -762,14 +795,14 @@ static int llc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
 	int rc = 0;
 	struct llc_sock *llc = llc_sk(sk);
 
-	if (llc_backlog_type(skb) == LLC_PACKET) {
-		if (llc->state > 1) /* not closed */
+	if (likely(llc_backlog_type(skb) == LLC_PACKET)) {
+		if (likely(llc->state > 1)) /* not closed */
 			rc = llc_conn_rcv(sk, skb);
 		else
 			goto out_kfree_skb;
 	} else if (llc_backlog_type(skb) == LLC_EVENT) {
 		/* timer expiration event */
-		if (llc->state > 1)  /* not closed */
+		if (likely(llc->state > 1))  /* not closed */
 			rc = llc_conn_state_process(sk, skb);
 		else
 			goto out_kfree_skb;
@@ -799,22 +832,22 @@ static void llc_sk_init(struct sock* sk)
 	llc->dec_step = llc->connect_step = 1;
 
 	init_timer(&llc->ack_timer.timer);
-	llc->ack_timer.expire	      = LLC_ACK_TIME;
+	llc->ack_timer.expire	      = sysctl_llc2_ack_timeout;
 	llc->ack_timer.timer.data     = (unsigned long)sk;
 	llc->ack_timer.timer.function = llc_conn_ack_tmr_cb;
 
 	init_timer(&llc->pf_cycle_timer.timer);
-	llc->pf_cycle_timer.expire	   = LLC_P_TIME;
+	llc->pf_cycle_timer.expire	   = sysctl_llc2_p_timeout;
 	llc->pf_cycle_timer.timer.data     = (unsigned long)sk;
 	llc->pf_cycle_timer.timer.function = llc_conn_pf_cycle_tmr_cb;
 
 	init_timer(&llc->rej_sent_timer.timer);
-	llc->rej_sent_timer.expire	   = LLC_REJ_TIME;
+	llc->rej_sent_timer.expire	   = sysctl_llc2_rej_timeout;
 	llc->rej_sent_timer.timer.data     = (unsigned long)sk;
 	llc->rej_sent_timer.timer.function = llc_conn_rej_tmr_cb;
 
 	init_timer(&llc->busy_state_timer.timer);
-	llc->busy_state_timer.expire	     = LLC_BUSY_TIME;
+	llc->busy_state_timer.expire	     = sysctl_llc2_busy_timeout;
 	llc->busy_state_timer.timer.data     = (unsigned long)sk;
 	llc->busy_state_timer.timer.function = llc_conn_busy_tmr_cb;
 
@@ -834,7 +867,8 @@ static void llc_sk_init(struct sock* sk)
  *	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_sk_alloc(int family, int priority, struct proto *prot)
+struct sock *llc_sk_alloc(int family, unsigned int __nocast priority,
+			 struct proto *prot)
 {
 	struct sock *sk = sk_alloc(family, priority, prot, 1);
 
diff --git a/net/llc/llc_core.c b/net/llc/llc_core.c
index 9727455bf0e7..ab0fcd32fd84 100644
--- a/net/llc/llc_core.c
+++ b/net/llc/llc_core.c
@@ -40,6 +40,7 @@ static struct llc_sap *llc_sap_alloc(void)
 		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;
 }
@@ -52,9 +53,7 @@ static struct llc_sap *llc_sap_alloc(void)
  */
 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);
 }
 
 /**
@@ -70,11 +69,25 @@ static void llc_del_sap(struct llc_sap *sap)
 	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)
@@ -82,11 +95,9 @@ 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;
 }
@@ -106,19 +117,20 @@ struct llc_sap *llc_sap_open(unsigned char lsap,
 					 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->laddr.lsap = lsap;
 	sap->rcv_func	= func;
+	llc_sap_hold(sap);
 	llc_add_sap(sap);
 out:
+	write_unlock_bh(&llc_sap_list_lock);
 	return sap;
 }
 
diff --git a/net/llc/llc_if.c b/net/llc/llc_if.c
index 0f84f66018e4..ba90f7f0801a 100644
--- a/net/llc/llc_if.c
+++ b/net/llc/llc_if.c
@@ -47,14 +47,11 @@ int llc_build_and_send_pkt(struct sock *sk, struct sk_buff *skb)
 	int rc = -ECONNABORTED;
 	struct llc_sock *llc = llc_sk(sk);
 
-	if (llc->state == LLC_CONN_STATE_ADM)
+	if (unlikely(llc->state == LLC_CONN_STATE_ADM))
 		goto out;
 	rc = -EBUSY;
-	if (llc_data_accept_state(llc->state)) { /* data_conn_refuse */
-		llc->failed_data_req = 1;
-		goto out;
-	}
-	if (llc->p_flag) {
+	if (unlikely(llc_data_accept_state(llc->state) || /* data_conn_refuse */
+		     llc->p_flag)) {
 		llc->failed_data_req = 1;
 		goto out;
 	}
@@ -110,6 +107,7 @@ int llc_establish_connection(struct sock *sk, u8 *lmac, u8 *dmac, u8 dsap)
 		ev->type      = LLC_CONN_EV_TYPE_PRIM;
 		ev->prim      = LLC_CONN_PRIM;
 		ev->prim_type = LLC_PRIM_TYPE_REQ;
+		skb_set_owner_w(skb, sk);
 		rc = llc_conn_state_process(sk, skb);
 	}
 out_put:
@@ -144,6 +142,7 @@ int llc_send_disc(struct sock *sk)
 	skb = alloc_skb(0, GFP_ATOMIC);
 	if (!skb)
 		goto out;
+	skb_set_owner_w(skb, sk);
 	sk->sk_state  = TCP_CLOSING;
 	ev	      = llc_conn_ev(skb);
 	ev->type      = LLC_CONN_EV_TYPE_PRIM;
diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
index 13b46240b7a1..8f3addf0724c 100644
--- a/net/llc/llc_input.c
+++ b/net/llc/llc_input.c
@@ -99,15 +99,19 @@ out:
 static inline int llc_fixup_skb(struct sk_buff *skb)
 {
 	u8 llc_len = 2;
-	struct llc_pdu_sn *pdu;
+	struct llc_pdu_un *pdu;
 
-	if (!pskb_may_pull(skb, sizeof(*pdu)))
+	if (unlikely(!pskb_may_pull(skb, sizeof(*pdu))))
 		return 0;
 
-	pdu = (struct llc_pdu_sn *)skb->data;
+	pdu = (struct llc_pdu_un *)skb->data;
 	if ((pdu->ctrl_1 & LLC_PDU_TYPE_MASK) == LLC_PDU_TYPE_U)
 		llc_len = 1;
 	llc_len += 2;
+
+	if (unlikely(!pskb_may_pull(skb, llc_len)))
+		return 0;
+
 	skb->h.raw += llc_len;
 	skb_pull(skb, llc_len);
 	if (skb->protocol == htons(ETH_P_802_2)) {
@@ -166,17 +170,22 @@ int llc_rcv(struct sk_buff *skb, struct net_device *dev,
 	 */
 	if (sap->rcv_func) {
 		sap->rcv_func(skb, dev, pt, orig_dev);
-		goto out;
+		goto out_put;
 	}
 	dest = llc_pdu_type(skb);
 	if (unlikely(!dest || !llc_type_handlers[dest - 1]))
-		goto drop;
+		goto drop_put;
 	llc_type_handlers[dest - 1](sap, skb);
+out_put:
+	llc_sap_put(sap);
 out:
 	return 0;
 drop:
 	kfree_skb(skb);
 	goto out;
+drop_put:
+	kfree_skb(skb);
+	goto out_put;
 handle_station:
 	if (!llc_station_handler)
 		goto drop;
diff --git a/net/llc/llc_output.c b/net/llc/llc_output.c
index ab5784cf163e..b4d55b6abb67 100644
--- a/net/llc/llc_output.c
+++ b/net/llc/llc_output.c
@@ -98,7 +98,7 @@ int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb,
 			    dsap, LLC_PDU_CMD);
 	llc_pdu_init_as_ui_cmd(skb);
 	rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac);
-	if (!rc)
+	if (likely(!rc))
 		rc = dev_queue_xmit(skb);
 	return rc;
 }
diff --git a/net/llc/llc_proc.c b/net/llc/llc_proc.c
index 36e8db3fa1a2..bd531cb235a7 100644
--- a/net/llc/llc_proc.c
+++ b/net/llc/llc_proc.c
@@ -134,7 +134,7 @@ static int llc_seq_socket_show(struct seq_file *seq, void *v)
 	llc_ui_format_mac(seq, llc->daddr.mac);
 	seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
 		   atomic_read(&sk->sk_wmem_alloc),
-		   atomic_read(&sk->sk_rmem_alloc),
+		   atomic_read(&sk->sk_rmem_alloc) - llc->copied_seq,
 		   sk->sk_state,
 		   sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
 		   llc->link);
diff --git a/net/llc/llc_s_ac.c b/net/llc/llc_s_ac.c
index ed8ba7de6122..bb3580fb8cfe 100644
--- a/net/llc/llc_s_ac.c
+++ b/net/llc/llc_s_ac.c
@@ -58,7 +58,7 @@ int llc_sap_action_send_ui(struct llc_sap *sap, struct sk_buff *skb)
 			    ev->daddr.lsap, LLC_PDU_CMD);
 	llc_pdu_init_as_ui_cmd(skb);
 	rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
-	if (!rc)
+	if (likely(!rc))
 		rc = dev_queue_xmit(skb);
 	return rc;
 }
@@ -81,7 +81,7 @@ int llc_sap_action_send_xid_c(struct llc_sap *sap, struct sk_buff *skb)
 			    ev->daddr.lsap, LLC_PDU_CMD);
 	llc_pdu_init_as_xid_cmd(skb, LLC_XID_NULL_CLASS_2, 0);
 	rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
-	if (!rc)
+	if (likely(!rc))
 		rc = dev_queue_xmit(skb);
 	return rc;
 }
@@ -103,15 +103,14 @@ int llc_sap_action_send_xid_r(struct llc_sap *sap, struct sk_buff *skb)
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_da(skb, mac_sa);
 	llc_pdu_decode_ssap(skb, &dsap);
-	nskb = llc_alloc_frame();
+	nskb = llc_alloc_frame(NULL, skb->dev);
 	if (!nskb)
 		goto out;
-	nskb->dev = skb->dev;
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
 			    LLC_PDU_RSP);
 	llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 0);
 	rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
-	if (!rc)
+	if (likely(!rc))
 		rc = dev_queue_xmit(nskb);
 out:
 	return rc;
@@ -135,7 +134,7 @@ int llc_sap_action_send_test_c(struct llc_sap *sap, struct sk_buff *skb)
 			    ev->daddr.lsap, LLC_PDU_CMD);
 	llc_pdu_init_as_test_cmd(skb);
 	rc = llc_mac_hdr_init(skb, ev->saddr.mac, ev->daddr.mac);
-	if (!rc)
+	if (likely(!rc))
 		rc = dev_queue_xmit(skb);
 	return rc;
 }
@@ -149,15 +148,14 @@ int llc_sap_action_send_test_r(struct llc_sap *sap, struct sk_buff *skb)
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_da(skb, mac_sa);
 	llc_pdu_decode_ssap(skb, &dsap);
-	nskb = llc_alloc_frame();
+	nskb = llc_alloc_frame(NULL, skb->dev);
 	if (!nskb)
 		goto out;
-	nskb->dev = skb->dev;
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
 			    LLC_PDU_RSP);
 	llc_pdu_init_as_test_rsp(nskb, skb);
 	rc = llc_mac_hdr_init(nskb, mac_sa, mac_da);
-	if (!rc)
+	if (likely(!rc))
 		rc = dev_queue_xmit(nskb);
 out:
 	return rc;
diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c
index 34228ef14985..4029ceee9b91 100644
--- a/net/llc/llc_sap.c
+++ b/net/llc/llc_sap.c
@@ -26,11 +26,12 @@
 
 /**
  *	llc_alloc_frame - allocates sk_buff for frame
+ *	@dev: network device this skb will be sent over
  *
  *	Allocates an sk_buff for frame and initializes sk_buff fields.
  *	Returns allocated skb or %NULL when out of memory.
  */
-struct sk_buff *llc_alloc_frame(void)
+struct sk_buff *llc_alloc_frame(struct sock *sk, struct net_device *dev)
 {
 	struct sk_buff *skb = alloc_skb(128, GFP_ATOMIC);
 
@@ -38,18 +39,23 @@ struct sk_buff *llc_alloc_frame(void)
 		skb_reserve(skb, 50);
 		skb->nh.raw   = skb->h.raw = skb->data;
 		skb->protocol = htons(ETH_P_802_2);
-		skb->dev      = dev_base->next;
+		skb->dev      = dev;
 		skb->mac.raw  = skb->head;
+		if (sk != NULL)
+			skb_set_owner_w(skb, sk);
 	}
 	return skb;
 }
 
-void llc_save_primitive(struct sk_buff* skb, u8 prim)
+void llc_save_primitive(struct sock *sk, struct sk_buff* skb, u8 prim)
 {
-	struct sockaddr_llc *addr = llc_ui_skb_cb(skb);
+	struct sockaddr_llc *addr;
 
+	if (skb->sk->sk_type == SOCK_STREAM) /* See UNIX98 */
+		return;
        /* save primitive for use by the user. */
-	addr->sllc_family = skb->sk->sk_family;
+	addr		  = llc_ui_skb_cb(skb);
+	addr->sllc_family = sk->sk_family;
 	addr->sllc_arphrd = skb->dev->type;
 	addr->sllc_test   = prim == LLC_TEST_PRIM;
 	addr->sllc_xid    = prim == LLC_XID_PRIM;
@@ -189,7 +195,7 @@ static void llc_sap_state_process(struct llc_sap *sap, struct sk_buff *skb)
 		if (skb->sk->sk_state == TCP_LISTEN)
 			kfree_skb(skb);
 		else {
-			llc_save_primitive(skb, ev->prim);
+			llc_save_primitive(skb->sk, skb, ev->prim);
 
 			/* queue skb to the user. */
 			if (sock_queue_rcv_skb(skb->sk, skb))
@@ -308,7 +314,7 @@ void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb)
 
 	sk = llc_lookup_dgram(sap, &laddr);
 	if (sk) {
-		skb->sk = sk;
+		skb_set_owner_r(skb, sk);
 		llc_sap_rcv(sap, skb);
 		sock_put(sk);
 	} else
diff --git a/net/llc/llc_station.c b/net/llc/llc_station.c
index 8fe48a24bad5..f37dbf8ef126 100644
--- a/net/llc/llc_station.c
+++ b/net/llc/llc_station.c
@@ -50,6 +50,10 @@ struct llc_station {
 	struct sk_buff_head	    mac_pdu_q;
 };
 
+#define LLC_STATION_ACK_TIME (3 * HZ)
+
+int sysctl_llc_station_ack_timeout = LLC_STATION_ACK_TIME;
+
 /* Types of events (possible values in 'ev->type') */
 #define LLC_STATION_EV_TYPE_SIMPLE	1
 #define LLC_STATION_EV_TYPE_CONDITION	2
@@ -218,7 +222,8 @@ static void llc_station_send_pdu(struct sk_buff *skb)
 
 static int llc_station_ac_start_ack_timer(struct sk_buff *skb)
 {
-	mod_timer(&llc_main_station.ack_timer, jiffies + LLC_ACK_TIME * HZ);
+	mod_timer(&llc_main_station.ack_timer,
+		  jiffies + sysctl_llc_station_ack_timeout);
 	return 0;
 }
 
@@ -249,14 +254,14 @@ static int llc_station_ac_inc_xid_r_cnt_by_1(struct sk_buff *skb)
 static int llc_station_ac_send_null_dsap_xid_c(struct sk_buff *skb)
 {
 	int rc = 1;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev);
 
 	if (!nskb)
 		goto out;
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, 0, LLC_PDU_CMD);
 	llc_pdu_init_as_xid_cmd(nskb, LLC_XID_NULL_CLASS_2, 127);
 	rc = llc_mac_hdr_init(nskb, llc_station_mac_sa, llc_station_mac_sa);
-	if (rc)
+	if (unlikely(rc))
 		goto free;
 	llc_station_send_pdu(nskb);
 out:
@@ -270,18 +275,17 @@ static int llc_station_ac_send_xid_r(struct sk_buff *skb)
 {
 	u8 mac_da[ETH_ALEN], dsap;
 	int rc = 1;
-	struct sk_buff* nskb = llc_alloc_frame();
+	struct sk_buff* nskb = llc_alloc_frame(NULL, skb->dev);
 
 	if (!nskb)
 		goto out;
 	rc = 0;
-	nskb->dev = skb->dev;
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_ssap(skb, &dsap);
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
 	llc_pdu_init_as_xid_rsp(nskb, LLC_XID_NULL_CLASS_2, 127);
 	rc = llc_mac_hdr_init(nskb, llc_station_mac_sa, mac_da);
-	if (rc)
+	if (unlikely(rc))
 		goto free;
 	llc_station_send_pdu(nskb);
 out:
@@ -295,18 +299,17 @@ static int llc_station_ac_send_test_r(struct sk_buff *skb)
 {
 	u8 mac_da[ETH_ALEN], dsap;
 	int rc = 1;
-	struct sk_buff *nskb = llc_alloc_frame();
+	struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev);
 
 	if (!nskb)
 		goto out;
 	rc = 0;
-	nskb->dev = skb->dev;
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_ssap(skb, &dsap);
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, 0, dsap, LLC_PDU_RSP);
        	llc_pdu_init_as_test_rsp(nskb, skb);
 	rc = llc_mac_hdr_init(nskb, llc_station_mac_sa, mac_da);
-	if (rc)
+	if (unlikely(rc))
 		goto free;
 	llc_station_send_pdu(nskb);
 out:
@@ -689,7 +692,8 @@ int __init llc_station_init(void)
 	init_timer(&llc_main_station.ack_timer);
 	llc_main_station.ack_timer.data     = (unsigned long)&llc_main_station;
 	llc_main_station.ack_timer.function = llc_station_ack_tmr_cb;
-
+	llc_main_station.ack_timer.expires  = jiffies +
+						sysctl_llc_station_ack_timeout;
 	skb = alloc_skb(0, GFP_ATOMIC);
 	if (!skb)
 		goto out;
@@ -697,7 +701,6 @@ int __init llc_station_init(void)
 	llc_set_station_handler(llc_station_rcv);
 	ev = llc_station_ev(skb);
 	memset(ev, 0, sizeof(*ev));
-	llc_main_station.ack_timer.expires = jiffies + 3 * HZ;
 	llc_main_station.maximum_retry	= 1;
 	llc_main_station.state		= LLC_STATION_STATE_DOWN;
 	ev->type	= LLC_STATION_EV_TYPE_SIMPLE;
diff --git a/net/llc/sysctl_net_llc.c b/net/llc/sysctl_net_llc.c
new file mode 100644
index 000000000000..d1eaddb13633
--- /dev/null
+++ b/net/llc/sysctl_net_llc.c
@@ -0,0 +1,131 @@
+/*
+ * sysctl_net_llc.c: sysctl interface to LLC net subsystem.
+ * 
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ */
+
+#include <linux/config.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/sysctl.h>
+#include <net/llc.h>
+
+#ifndef CONFIG_SYSCTL
+#error This file should not be compiled without CONFIG_SYSCTL defined
+#endif
+
+static struct ctl_table llc2_timeout_table[] = {
+	{
+		.ctl_name	= NET_LLC2_ACK_TIMEOUT,
+		.procname	= "ack",
+		.data		= &sysctl_llc2_ack_timeout,
+		.maxlen		= sizeof(long),
+		.mode		= 0644,
+		.proc_handler   = &proc_dointvec_jiffies,
+		.strategy       = &sysctl_jiffies,
+	},
+	{
+		.ctl_name	= NET_LLC2_BUSY_TIMEOUT,
+		.procname	= "busy",
+		.data		= &sysctl_llc2_busy_timeout,
+		.maxlen		= sizeof(long),
+		.mode		= 0644,
+		.proc_handler   = &proc_dointvec_jiffies,
+		.strategy       = &sysctl_jiffies,
+	},
+	{
+		.ctl_name	= NET_LLC2_P_TIMEOUT,
+		.procname	= "p",
+		.data		= &sysctl_llc2_p_timeout,
+		.maxlen		= sizeof(long),
+		.mode		= 0644,
+		.proc_handler   = &proc_dointvec_jiffies,
+		.strategy       = &sysctl_jiffies,
+	},
+	{
+		.ctl_name	= NET_LLC2_REJ_TIMEOUT,
+		.procname	= "rej",
+		.data		= &sysctl_llc2_rej_timeout,
+		.maxlen		= sizeof(long),
+		.mode		= 0644,
+		.proc_handler   = &proc_dointvec_jiffies,
+		.strategy       = &sysctl_jiffies,
+	},
+	{ 0 },
+};
+
+static struct ctl_table llc_station_table[] = {
+	{
+		.ctl_name	= NET_LLC_STATION_ACK_TIMEOUT,
+		.procname	= "ack_timeout",
+		.data		= &sysctl_llc_station_ack_timeout,
+		.maxlen		= sizeof(long),
+		.mode		= 0644,
+		.proc_handler   = &proc_dointvec_jiffies,
+		.strategy       = &sysctl_jiffies,
+	},
+	{ 0 },
+};
+
+static struct ctl_table llc2_dir_timeout_table[] = {
+	{
+		.ctl_name	= NET_LLC2,
+		.procname	= "timeout",
+		.mode		= 0555,
+		.child		= llc2_timeout_table,
+       	},
+	{ 0 },
+};
+
+static struct ctl_table llc_table[] = {
+	{
+		.ctl_name	= NET_LLC2,
+		.procname	= "llc2",
+		.mode		= 0555,
+		.child		= llc2_dir_timeout_table,
+       	},
+	{
+		.ctl_name       = NET_LLC_STATION,
+		.procname       = "station",
+		.mode           = 0555,
+		.child          = llc_station_table,
+	},
+	{ 0 },
+};
+
+static struct ctl_table llc_dir_table[] = {
+	{
+		.ctl_name	= NET_LLC,
+		.procname	= "llc",
+		.mode		= 0555,
+		.child		= llc_table,
+       	},
+	{ 0 },
+};
+
+static struct ctl_table llc_root_table[] = {
+	{
+		.ctl_name	= CTL_NET,
+		.procname	= "net",
+		.mode		= 0555,
+		.child		= llc_dir_table,
+	},
+	{ 0 },
+};
+
+static struct ctl_table_header *llc_table_header;
+
+int __init llc_sysctl_init(void)
+{
+	llc_table_header = register_sysctl_table(llc_root_table, 1);
+
+	return llc_table_header ? 0 : -ENOMEM;
+}
+
+void llc_sysctl_exit(void)
+{
+	if (llc_table_header) {
+		unregister_sysctl_table(llc_table_header);
+		llc_table_header = NULL;
+	}
+}