natm_pcb.c

/*-
 * Copyright (c) 1996 Charles D. Cranor and Washington University.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Charles D. Cranor and
 *      Washington University.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck Exp $
 */

/*
 * atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
 * from trying to use each other's VCs.
 */

#include "opt_ddb.h"

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/socketvar.h>

#include <net/if.h>
#include <net/if_var.h>		/* XXX: db_show_natm() */

#include <netinet/in.h>

#include <netnatm/natm.h>

#include <ddb/ddb.h>

struct npcblist natm_pcbs;

/*
 * npcb_alloc: allocate a npcb [in the free state]
 */
struct natmpcb *
npcb_alloc(int wait)

{
	struct natmpcb *npcb;

	npcb = malloc(sizeof(*npcb), M_PCB, wait | M_ZERO);
	if (npcb != NULL)
		npcb->npcb_flags = NPCB_FREE;
	return (npcb);
}


/*
 * npcb_free: free a npcb
 */
void
npcb_free(struct natmpcb *npcb, int op)
{

	NATM_LOCK_ASSERT();

	if ((npcb->npcb_flags & NPCB_FREE) == 0) {
		LIST_REMOVE(npcb, pcblist);
		npcb->npcb_flags = NPCB_FREE;
	}
	if (op == NPCB_DESTROY) {
		if (npcb->npcb_inq) {
			npcb->npcb_flags = NPCB_DRAIN;	/* flag for distruct. */
		} else {
			free(npcb, M_PCB);		/* kill it! */
		}
	}
}


/*
 * npcb_add: add or remove npcb from main list
 *   returns npcb if ok
 */
struct natmpcb *
npcb_add(struct natmpcb *npcb, struct ifnet *ifp, u_int16_t vci, u_int8_t vpi)
{
	struct natmpcb *cpcb = NULL;		/* current pcb */

	NATM_LOCK_ASSERT();

	/*
	 * lookup required
	 */
	LIST_FOREACH(cpcb, &natm_pcbs, pcblist)
		if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci &&
		    vpi == cpcb->npcb_vpi)
			break;

	/*
	 * add & something already there?
	 */
	if (cpcb) {
		cpcb = NULL;
		goto done;			/* fail */
	}
    
	/*
	 * need to allocate a pcb?
	 */
	if (npcb == NULL) {
		/* could be called from lower half */
		cpcb = npcb_alloc(M_NOWAIT);
		if (cpcb == NULL) 
			goto done;			/* fail */
	} else {
		cpcb = npcb;
	}

	cpcb->npcb_ifp = ifp;
	cpcb->ipaddr.s_addr = 0;
	cpcb->npcb_vci = vci;
	cpcb->npcb_vpi = vpi;
	cpcb->npcb_flags = NPCB_CONNECTED;

	LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);

done:
	return (cpcb);
}

#ifdef DDB
DB_SHOW_COMMAND(natm, db_show_natm)
{
	struct natmpcb *cpcb;

	db_printf("npcb dump:\n");
	LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
		db_printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, "
		    "flags=0x%x, inq=%d\n", cpcb->npcb_ifp->if_xname,
		    cpcb->npcb_vci, cpcb->npcb_vpi, cpcb->ipaddr.s_addr,
		    cpcb->npcb_socket, cpcb->npcb_flags, cpcb->npcb_inq);
	}
}
#endif