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 /*      $NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck Exp $       */
    2 /*-
    3  *
    4  * Copyright (c) 1996 Charles D. Cranor and Washington University.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Charles D. Cranor and
   18  *      Washington University.
   19  * 4. The name of the author may not be used to endorse or promote products
   20  *    derived from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   32  */
   33 
   34 /*
   35  * atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
   36  * from trying to use each other's VCs.
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: releng/6.1/sys/netnatm/natm_pcb.c 149077 2005-08-15 09:51:15Z rwatson $");
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/malloc.h>
   45 #include <sys/socket.h>
   46 #include <sys/socketvar.h>
   47 
   48 #include <net/if.h>
   49 
   50 #include <netinet/in.h>
   51 
   52 #include <netnatm/natm.h>
   53 
   54 struct npcblist natm_pcbs;
   55 
   56 /*
   57  * npcb_alloc: allocate a npcb [in the free state]
   58  */
   59 struct natmpcb *
   60 npcb_alloc(int wait)
   61 
   62 {
   63         struct natmpcb *npcb;
   64 
   65         npcb = malloc(sizeof(*npcb), M_PCB, wait | M_ZERO);
   66 
   67 #ifdef DIAGNOSTIC
   68         if (wait == M_WAITOK && npcb == NULL)
   69                 panic("npcb_alloc: malloc didn't wait");
   70 #endif
   71 
   72         if (npcb != NULL)
   73                 npcb->npcb_flags = NPCB_FREE;
   74         return (npcb);
   75 }
   76 
   77 
   78 /*
   79  * npcb_free: free a npcb
   80  */
   81 void
   82 npcb_free(struct natmpcb *npcb, int op)
   83 {
   84 
   85         NATM_LOCK_ASSERT();
   86 
   87         if ((npcb->npcb_flags & NPCB_FREE) == 0) {
   88                 LIST_REMOVE(npcb, pcblist);
   89                 npcb->npcb_flags = NPCB_FREE;
   90         }
   91         if (op == NPCB_DESTROY) {
   92                 if (npcb->npcb_inq) {
   93                         npcb->npcb_flags = NPCB_DRAIN;  /* flag for distruct. */
   94                 } else {
   95                         FREE(npcb, M_PCB);              /* kill it! */
   96                 }
   97         }
   98 }
   99 
  100 
  101 /*
  102  * npcb_add: add or remove npcb from main list
  103  *   returns npcb if ok
  104  */
  105 struct natmpcb *
  106 npcb_add(struct natmpcb *npcb, struct ifnet *ifp, u_int16_t vci, u_int8_t vpi)
  107 {
  108         struct natmpcb *cpcb = NULL;            /* current pcb */
  109 
  110         NATM_LOCK_ASSERT();
  111 
  112         /*
  113          * lookup required
  114          */
  115         LIST_FOREACH(cpcb, &natm_pcbs, pcblist)
  116                 if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci &&
  117                     vpi == cpcb->npcb_vpi)
  118                         break;
  119 
  120         /*
  121          * add & something already there?
  122          */
  123         if (cpcb) {
  124                 cpcb = NULL;
  125                 goto done;                      /* fail */
  126         }
  127     
  128         /*
  129          * need to allocate a pcb?
  130          */
  131         if (npcb == NULL) {
  132                 /* could be called from lower half */
  133                 cpcb = npcb_alloc(M_NOWAIT);
  134                 if (cpcb == NULL) 
  135                         goto done;                      /* fail */
  136         } else {
  137                 cpcb = npcb;
  138         }
  139 
  140         cpcb->npcb_ifp = ifp;
  141         cpcb->ipaddr.s_addr = 0;
  142         cpcb->npcb_vci = vci;
  143         cpcb->npcb_vpi = vpi;
  144         cpcb->npcb_flags = NPCB_CONNECTED;
  145 
  146         LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
  147 
  148 done:
  149         return (cpcb);
  150 }
  151 
  152 #ifdef DDB
  153 
  154 int
  155 npcb_dump(void)
  156 {
  157         struct natmpcb *cpcb;
  158 
  159         printf("npcb dump:\n");
  160         LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
  161                 printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, "
  162                     "inq=%d\n", cpcb->npcb_ifp->if_xname, cpcb->npcb_vci,
  163                     cpcb->npcb_vpi, cpcb->ipaddr.s_addr, cpcb->npcb_socket, 
  164                     cpcb->npcb_flags, cpcb->npcb_inq);
  165         }
  166         printf("done\n");
  167         return (0);
  168 }
  169 #endif

Cache object: 6e3426c560c93741421eac94ab8ce42a


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