FreeBSD/Linux Kernel Cross Reference
sys/netnatm/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: releng/11.2/sys/netnatm/natm_pcb.c 257176 2013-10-26 17:58:36Z glebius $");
    
    #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

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