patch-2.1.91 linux/net/netbeui/netbeui_llc.c

• Lines: 266
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.1.90/linux/net/netbeui/netbeui_llc.c
• Orig date: Thu Feb 12 20:56:15 1998

diff -u --recursive --new-file v2.1.90/linux/net/netbeui/netbeui_llc.c linux/net/netbeui/netbeui_llc.c
@@ -1,265 +0,0 @@
-/*
- *	NET3:	802.2 LLC supervisor for the netbeui protocols. 
- *
- *	The basic aim is to provide a self managing link layer supervisor
- *	for netbeui. It creates and destroys the 802.2 virtual connections
- *	as needed, and copes with the various races when a link goes down
- *	just as its requested etc.
- *
- *	The upper layers are presented with the notion of an nb_link which
- *	is a potentially shared object that represents a logical path 
- *	between two hosts. Each nb_link has usage counts and users can
- *	treat it as if its their own.
- */
- 
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/socket.h>
-#include <linux/sockios.h>
-#include <linux/notifier.h>
-#include <linux/netdevice.h>
-#include <linux/skbuff.h>
-#include <net/datalink.h>
-#include <net/p8022.h>
-#include <net/psnap.h>
-#include <net/sock.h>
-#include <net/llc.h>
-#include <net/netbeui.h>
-
-
-/*
- *	When this routine is called the netbeui layer has decided to
- *	drop the link. There is a tiny risk that we might reuse the
- *	link after we decide. Thus before we blast the link into little
- *	tiny pieces we must check....
- */
- 
-static void netbeui_do_destroy(struct nb_link *nb)
-{
-	/*
-	 *	Are we wanted again. Bring it back. Sigh, wish people
-	 *	would make up their minds 8)
-	 */
-	if(nb->users>0)
-	{
-		nb->state=NETBEUI_CONNWAIT;
-		llc_connect_request(&nb->llc);
-		return;
-	}
-	/*
-	 *	Blam.... into oblivion it goes
-	 */
-	
-	llc_unregister(&nb->llc);
-	netbeui_free_link(nb);
-}
-
-/*
- *	Handle netbeui events. Basically that means keep it up when it
- *	should be up, down when it should be down and handle all the data.
- */
-
-static void netbeui_event(llcptr llc)
-{
-	struct nb_link *nb=(struct nb_link *)llc;
-	
-	/*
-	 *	See what has occured
-	 */
-	 
-
-	/*
-	 *	Connect completion confirmation
-	 */
-	 
-	if(llc->llc_callbacks&LLC_CONN_CONFIRM)
-	{
-		/*
-		 *	Link up if desired. Otherwise try frantically
-		 *	to close it.
-		 */
-		if(nb->state!=NETBEUI_DEADWAIT)
-		{
-			/*
-			 *	Wake pending writers
-			 */
-			nb->state=NETBEUI_OPEN;
-			netbeui_wakeup(nb);
-		}
-		else
-			llc_disconnect_request(llc);
-	}
-	
-	/*
-	 *	Data is passed to the upper netbeui layer
-	 */
-
-	if(llc->llc_callbacks&LLC_DATA_INDIC)
-	{
-		netbeu_rcv_stream(llc,llc->inc_skb);
-		/*
-		 *	Frame free is controlled by our stream processor
-		 */
-		return;
-	}
-
-	/*
-	 *	We got disconnected
-	 */
-	 
-	if(llc->llc_callbacks&LLC_DISC_INDICATION)
-	{
-		if(nb->state==NETBEUI_DEADWAIT)
-		{
-			netbeui_do_destroy(nb);
-			return;
-		}
-		if(nb->state==NETBEUI_DISCWAIT)
-		{
-			llc_connect_request(llc);
-			nb->state=NETBEUI_CONNWAIT;
-		}
-	}
-	
-	/*
-	 *	Miscellaneous burps
-	 */
-	
-	if(llc->llc_callbacks&(LLC_RESET_INDIC_LOC|LLC_RESET_INDIC_REM|
-					LLC_RST_CONFIRM))
-	{
-		/*
-		 *	Reset. 
-		 *	Q: Is tearing the link down the right answer ?
-		 *
-		 *	For now we just carry on
-		 */
-	}
-
-	/*
-	 *	Track link busy status
-	 */
-	 
-	if(llc->llc_callbacks&LLC_REMOTE_BUSY)
-		nb->busy=1;	/* Send no more for a bit */
-	if(llc->llc_callbacks&LLC_REMOTE_NOTBUSY)
-	{
-		/* Coming unbusy may wake sending threads */
-		nb->busy=0;
-		netbeui_wakeup(nb);
-	}		
-	/*
-	 *	UI frames are passed to the upper netbeui layer.
-	 */
-	if(llc->llc_callbacks&LLC_UI_DATA)
-	{
-		netbeui_rcv_dgram(llc,llc->inc_skb);
-		return;
-	}
-
-	/* We ignore TST, XID, FRMR stuff */
-	/* FIXME: We need to free frames here once I fix the callback! */
-	if(llc->inc_skb)
-		kfree_skb(skb);
-}
-
-/*
- *	Netbeui has created a new logical link. As a result we will
- *	need to find or create a suitable 802.2 LLC session and join
- *	it.
- */
-
-struct nb_link *netbeui_create_channel(struct device *dev, u8 *remote_mac, int pri)
-{
-	struct nb_link *nb=netbeui_find_channel(dev,remote_mac);
-	if(nb)
-	{
-		if(nb->state==NETBEUI_DEADWAIT)
-		{
-			/*
-			 *	We had commenced a final shutdown. We
-			 *	cannot abort that (we sent the packet) but
-			 *	we can shift the mode to DISCWAIT. That will
-			 *	cause the disconnect event to bounce us
-			 *	back into connected state.
-			 */
-			nb->state==NETBEUI_DISCWAIT;
-		}
-		nb->users++;
-		return nb;
-	}
-	nb=netbeui_alloc_link(pri);
-	if(nb==NULL)
-		return NULL;
-	
-	/*
-	 *	Internal book keeping
-	 */
-	 
-	nb->dev=dev;
-	nb->users=1;
-	nb->busy=0;
-	nb->wakeup=NULL;
-	nb->state=NETBEUI_CONNWAIT;
-	memcpy(nb->remote_mac, remote_mac, ETH_ALEN);
-	
-	/*
-	 *	Now try and attach an LLC.
-	 */
-	
-	if(register_cl2llc_client(&nb->llc,dev->name,netbeui_event,
-		remote_mac, NETBEUI_SAP, NETBEUI_SAP)<0)
-	{
-		netbeui_free_link(nb);
-		return NULL;
-	}
-	
-	/*
-	 *	Commence connection establishment.
-	 */
-	 
-	llc_connect_request(&nb->llc);
-	
-	/*
-	 *	Done
-	 */
-
-	nb->next=nb_link_list;
-	nb_link_list=nb;
-	 
-	return nb;
-}
-
-/*
- *	A logical netbeui channel has died. If the channel has no
- *	further users we commence shutdown.
- */
-	
-int netbeui_delete_channel(struct nb_link *nb)
-{
-	nb->users--;
-	
-	/*
-	 *	FIXME: Must remove ourselves from the nb_link chain when
-	 *	we add that bit
-	 */
-	 
-	if(nb->users)
-		return 0;
-		
-	/*
-	 *	Ensure we drop soon. The disconnect confirm will let
-	 *	us fix the deletion. If someone wants the link at
-	 *	the wrong moment nothing bad will occur. The create
-	 *	or the do_destroy will sort it.
-	 */
-
-	nb->state = NETBEUI_DEADWAIT;
-	llc_disconnect_request(lp);
-	return 0;
-}
-
-