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 /*-
    2  * Copyright (c) 1996 Charles D. Cranor and Washington University.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by Charles D. Cranor and
   16  *      Washington University.
   17  * 4. The name of the author may not be used to endorse or promote products
   18  *    derived from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * $NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck Exp $
   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 "opt_ddb.h"
   40 
   41 #include <sys/cdefs.h>
   42 __FBSDID("$FreeBSD: stable/8/sys/netnatm/natm_pcb.c 199583 2009-11-20 15:27:52Z jhb $");
   43 
   44 #include <sys/param.h>
   45 #include <sys/kernel.h>
   46 #include <sys/malloc.h>
   47 #include <sys/systm.h>
   48 #include <sys/socket.h>
   49 #include <sys/socketvar.h>
   50 
   51 #include <net/if.h>
   52 
   53 #include <netinet/in.h>
   54 
   55 #include <netnatm/natm.h>
   56 
   57 #include <ddb/ddb.h>
   58 
   59 struct npcblist natm_pcbs;
   60 
   61 /*
   62  * npcb_alloc: allocate a npcb [in the free state]
   63  */
   64 struct natmpcb *
   65 npcb_alloc(int wait)
   66 
   67 {
   68         struct natmpcb *npcb;
   69 
   70         npcb = malloc(sizeof(*npcb), M_PCB, wait | M_ZERO);
   71         if (npcb != NULL)
   72                 npcb->npcb_flags = NPCB_FREE;
   73         return (npcb);
   74 }
   75 
   76 
   77 /*
   78  * npcb_free: free a npcb
   79  */
   80 void
   81 npcb_free(struct natmpcb *npcb, int op)
   82 {
   83 
   84         NATM_LOCK_ASSERT();
   85 
   86         if ((npcb->npcb_flags & NPCB_FREE) == 0) {
   87                 LIST_REMOVE(npcb, pcblist);
   88                 npcb->npcb_flags = NPCB_FREE;
   89         }
   90         if (op == NPCB_DESTROY) {
   91                 if (npcb->npcb_inq) {
   92                         npcb->npcb_flags = NPCB_DRAIN;  /* flag for distruct. */
   93                 } else {
   94                         free(npcb, M_PCB);              /* kill it! */
   95                 }
   96         }
   97 }
   98 
   99 
  100 /*
  101  * npcb_add: add or remove npcb from main list
  102  *   returns npcb if ok
  103  */
  104 struct natmpcb *
  105 npcb_add(struct natmpcb *npcb, struct ifnet *ifp, u_int16_t vci, u_int8_t vpi)
  106 {
  107         struct natmpcb *cpcb = NULL;            /* current pcb */
  108 
  109         NATM_LOCK_ASSERT();
  110 
  111         /*
  112          * lookup required
  113          */
  114         LIST_FOREACH(cpcb, &natm_pcbs, pcblist)
  115                 if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci &&
  116                     vpi == cpcb->npcb_vpi)
  117                         break;
  118 
  119         /*
  120          * add & something already there?
  121          */
  122         if (cpcb) {
  123                 cpcb = NULL;
  124                 goto done;                      /* fail */
  125         }
  126     
  127         /*
  128          * need to allocate a pcb?
  129          */
  130         if (npcb == NULL) {
  131                 /* could be called from lower half */
  132                 cpcb = npcb_alloc(M_NOWAIT);
  133                 if (cpcb == NULL) 
  134                         goto done;                      /* fail */
  135         } else {
  136                 cpcb = npcb;
  137         }
  138 
  139         cpcb->npcb_ifp = ifp;
  140         cpcb->ipaddr.s_addr = 0;
  141         cpcb->npcb_vci = vci;
  142         cpcb->npcb_vpi = vpi;
  143         cpcb->npcb_flags = NPCB_CONNECTED;
  144 
  145         LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
  146 
  147 done:
  148         return (cpcb);
  149 }
  150 
  151 #ifdef DDB
  152 DB_SHOW_COMMAND(natm, db_show_natm)
  153 {
  154         struct natmpcb *cpcb;
  155 
  156         db_printf("npcb dump:\n");
  157         LIST_FOREACH(cpcb, &natm_pcbs, pcblist) {
  158                 db_printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, "
  159                     "flags=0x%x, inq=%d\n", cpcb->npcb_ifp->if_xname,
  160                     cpcb->npcb_vci, cpcb->npcb_vpi, cpcb->ipaddr.s_addr,
  161                     cpcb->npcb_socket, cpcb->npcb_flags, cpcb->npcb_inq);
  162         }
  163 }
  164 #endif

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