The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /* $FreeBSD: releng/5.0/sys/netnatm/natm_pcb.c 92745 2002-03-20 02:39:27Z alfred $ */
    2 /*      $NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck Exp $       */
    3 
    4 /*
    5  *
    6  * Copyright (c) 1996 Charles D. Cranor and Washington University.
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by Charles D. Cranor and
   20  *      Washington University.
   21  * 4. The name of the author may not be used to endorse or promote products
   22  *    derived from this software without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   25  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   26  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   27  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   28  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   29  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   33  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   34  */
   35 
   36 /*
   37  * atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
   38  * from trying to use each other's VCs.
   39  */
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/malloc.h>
   44 #include <sys/socket.h>
   45 #include <sys/socketvar.h>
   46 
   47 #include <net/if.h>
   48 
   49 #include <netinet/in.h>
   50 
   51 #include <netnatm/natm.h>
   52 
   53 struct npcblist natm_pcbs;
   54 
   55 /*
   56  * npcb_alloc: allocate a npcb [in the free state]
   57  */
   58 
   59 struct natmpcb *npcb_alloc(wait)
   60 
   61 int wait;
   62 
   63 {
   64   struct natmpcb *npcb;
   65 
   66   MALLOC(npcb, struct natmpcb *, sizeof(*npcb), M_PCB, wait | M_ZERO);
   67 
   68 #ifdef DIAGNOSTIC
   69   if (wait == M_WAITOK && npcb == NULL) panic("npcb_alloc: malloc didn't wait");
   70 #endif
   71 
   72   if (npcb)
   73     npcb->npcb_flags = NPCB_FREE;
   74 
   75   return(npcb);
   76 }
   77 
   78 
   79 /*
   80  * npcb_free: free a npcb
   81  */
   82 
   83 void npcb_free(npcb, op)
   84 
   85 struct natmpcb *npcb;
   86 int op;
   87 
   88 {
   89   int s = splimp();
   90 
   91   if ((npcb->npcb_flags & NPCB_FREE) == 0) {
   92     LIST_REMOVE(npcb, pcblist);
   93     npcb->npcb_flags = NPCB_FREE;
   94   }
   95   if (op == NPCB_DESTROY) {
   96     if (npcb->npcb_inq) {
   97       npcb->npcb_flags = NPCB_DRAIN;    /* flag for distruction */
   98     } else {
   99       FREE(npcb, M_PCB);                /* kill it! */
  100     }
  101   }
  102 
  103   splx(s);
  104 }
  105 
  106 
  107 /*
  108  * npcb_add: add or remove npcb from main list
  109  *   returns npcb if ok
  110  */
  111 
  112 struct natmpcb *npcb_add(npcb, ifp, vci, vpi)
  113 
  114 struct natmpcb *npcb;
  115 struct ifnet *ifp;
  116 u_int16_t vci;
  117 u_int8_t vpi;
  118 
  119 {
  120   struct natmpcb *cpcb = NULL;          /* current pcb */
  121   int s = splimp();
  122 
  123 
  124   /*
  125    * lookup required
  126    */
  127 
  128   for (cpcb = LIST_FIRST(&natm_pcbs) ; cpcb != NULL ; 
  129                                         cpcb = LIST_NEXT(cpcb, pcblist)) {
  130     if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci && vpi == cpcb->npcb_vpi)
  131       break;
  132   }
  133 
  134   /*
  135    * add & something already there?
  136    */
  137 
  138   if (cpcb) {
  139     cpcb = NULL;
  140     goto done;                                  /* fail */
  141   }
  142     
  143   /*
  144    * need to allocate a pcb?
  145    */
  146 
  147   if (npcb == NULL) {
  148     cpcb = npcb_alloc(M_NOWAIT);        /* could be called from lower half */
  149     if (cpcb == NULL) 
  150       goto done;                        /* fail */
  151   } else {
  152     cpcb = npcb;
  153   }
  154 
  155   cpcb->npcb_ifp = ifp;
  156   cpcb->ipaddr.s_addr = 0;
  157   cpcb->npcb_vci = vci;
  158   cpcb->npcb_vpi = vpi;
  159   cpcb->npcb_flags = NPCB_CONNECTED;
  160 
  161   LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
  162 
  163 done:
  164   splx(s);
  165   return(cpcb);
  166 }
  167 
  168 
  169 
  170 #ifdef DDB
  171 
  172 int npcb_dump(void);
  173 
  174 int npcb_dump()
  175 
  176 {
  177   struct natmpcb *cpcb;
  178 
  179   printf("npcb dump:\n");
  180   for (cpcb = LIST_FIRST(&natm_pcbs) ; cpcb != NULL ; 
  181                                         cpcb = LIST_NEXT(cpcb, pcblist)) {
  182     printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, inq=%d\n",
  183         cpcb->npcb_ifp->if_xname, cpcb->npcb_vci, cpcb->npcb_vpi,
  184         cpcb->ipaddr.s_addr, cpcb->npcb_socket, 
  185         cpcb->npcb_flags, cpcb->npcb_inq);
  186   }
  187   printf("done\n");
  188   return(0);
  189 }
  190 
  191 #endif

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