4.3BSD-Reno/src/sys/netiso/clnp_timer.c

/***********************************************************
		Copyright IBM Corporation 1987

                      All Rights Reserved

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documentation for any purpose and without fee is hereby granted, 
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software without specific, written prior permission.  

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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.

******************************************************************/

/*
 * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
 */
/* $Header: clnp_timer.c,v 4.2 88/06/29 14:59:05 hagens Exp $ */
/* $Source: /usr/argo/sys/netiso/RCS/clnp_timer.c,v $ */
/*	@(#)clnp_timer.c	7.4 (Berkeley) 9/22/89 */

#ifndef lint
static char *rcsid = "$Header: clnp_timer.c,v 4.2 88/06/29 14:59:05 hagens Exp $";
#endif lint

#include "param.h"
#include "mbuf.h"
#include "domain.h"
#include "protosw.h"
#include "socket.h"
#include "socketvar.h"
#include "errno.h"

#include "../net/if.h"
#include "../net/route.h"

#include "iso.h"
#include "clnp.h"
#include "clnp_stat.h"
#include "argo_debug.h"

extern struct clnp_fragl *clnp_frags;

/*
 * FUNCTION:		clnp_freefrags
 *
 * PURPOSE:			Free the resources associated with a fragment
 *
 * RETURNS:			pointer to next fragment in list of fragments
 *
 * SIDE EFFECTS:	
 *
 * NOTES:			
 *			TODO: send ER back to source
 */
struct clnp_fragl *
clnp_freefrags(cfh)
register struct clnp_fragl	*cfh;	/* fragment header to delete */
{
	struct clnp_fragl	*next = cfh->cfl_next;
	struct clnp_frag	*cf;

	/* free any frags hanging around */
	cf = cfh->cfl_frags;
	while (cf != NULL) {
		struct clnp_frag	*cf_next = cf->cfr_next;
		INCSTAT(cns_fragdropped);
		m_freem(cf->cfr_data);
		cf = cf_next;
	}

	/* free the copy of the header */
	INCSTAT(cns_fragdropped);
	m_freem(cfh->cfl_orighdr);

	if (clnp_frags == cfh) {
		clnp_frags = cfh->cfl_next;
	} else {
		struct clnp_fragl	*scan;

		for (scan = clnp_frags; scan != NULL; scan = scan->cfl_next) {
			if (scan->cfl_next == cfh) {
				scan->cfl_next = cfh->cfl_next;
				break;
			}
		}
	}

	/* free the fragment header */
	m_freem(dtom(cfh));

	return(next);
}

/*
 * FUNCTION:		clnp_slowtimo
 *
 * PURPOSE:			clnp timer processing; if the ttl expires on a 
 *					packet on the reassembly queue, discard it.
 *
 * RETURNS:			none
 *
 * SIDE EFFECTS:	
 *
 * NOTES:			
 */
clnp_slowtimo()
{
	register struct clnp_fragl	*cfh = clnp_frags;
	int s = splnet();

	while (cfh != NULL) {
		if (--cfh->cfl_ttl == 0) {
			cfh = clnp_freefrags(cfh);
			INCSTAT(cns_fragtimeout);
		} else {
			cfh = cfh->cfl_next;
		}
	}
	splx(s);
}

/*
 * FUNCTION:		clnp_drain
 *
 * PURPOSE:			drain off all datagram fragments
 *
 * RETURNS:			none
 *
 * SIDE EFFECTS:	
 *
 * NOTES:			
 *	TODO: should send back ER
 */
clnp_drain()
{
	register struct clnp_fragl	*cfh = clnp_frags;

	while (cfh != NULL)
		cfh = clnp_freefrags(cfh);
}