FreeBSD/Linux Kernel Cross Reference
sys/netnatm/natm_pcb.c

     /* $FreeBSD$ */
     /*      $NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck Exp $       */
     
     /*
      *
      * 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.
     */
    
    /*
     * atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
     * from trying to use each other's VCs.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/malloc.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    
    #include <net/if.h>
    
    #include <netinet/in.h>
    
    #include <netnatm/natm.h>
    
    struct npcblist natm_pcbs;
    
    /*
     * npcb_alloc: allocate a npcb [in the free state]
     */
    
    struct natmpcb *npcb_alloc(wait)
    
    int wait;
    
    {
      struct natmpcb *npcb;
    
      MALLOC(npcb, struct natmpcb *, sizeof(*npcb), M_PCB, wait);
    
    #ifdef DIAGNOSTIC
      if (wait == M_WAITOK && npcb == NULL) panic("npcb_alloc: malloc didn't wait");
    #endif
    
      if (npcb) {
        bzero(npcb, sizeof(*npcb));
        npcb->npcb_flags = NPCB_FREE;
      }
      return(npcb);
    }
    
    
    /*
     * npcb_free: free a npcb
     */
    
    void npcb_free(npcb, op)
    
    struct natmpcb *npcb;
    int op;
    
    {
      int s = splimp();
    
      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 distruction */
        } else {
         FREE(npcb, M_PCB);                /* kill it! */
       }
     }
   
     splx(s);
   }
   
   
   /*
    * npcb_add: add or remove npcb from main list
    *   returns npcb if ok
    */
   
   struct natmpcb *npcb_add(npcb, ifp, vci, vpi)
   
   struct natmpcb *npcb;
   struct ifnet *ifp;
   u_int16_t vci;
   u_int8_t vpi;
   
   {
     struct natmpcb *cpcb = NULL;          /* current pcb */
     int s = splimp();
   
   
     /*
      * lookup required
      */
   
     for (cpcb = natm_pcbs.lh_first ; cpcb != NULL ; 
                                           cpcb = cpcb->pcblist.le_next) {
       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) {
       cpcb = npcb_alloc(M_NOWAIT);        /* could be called from lower half */
       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:
     splx(s);
     return(cpcb);
   }
   
   
   
   #ifdef DDB
   
   int npcb_dump __P((void));
   
   int npcb_dump()
   
   {
     struct natmpcb *cpcb;
   
     printf("npcb dump:\n");
     for (cpcb = natm_pcbs.lh_first ; cpcb != NULL ; 
                                           cpcb = cpcb->pcblist.le_next) {
       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);
     }
     printf("done\n");
     return(0);
   }
   
   #endif

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