sys/netproto/natm/natm_pcb.c

   1 /* $FreeBSD: src/sys/netnatm/natm_pcb.c,v 1.6.6.1 2000/08/03 18:56:28 peter Exp $ */
   2 /* $DragonFly: src/sys/netproto/natm/natm_pcb.c,v 1.9 2008/01/05 14:02:40 swildner Exp $ */
   3 /*      $NetBSD: natm_pcb.c,v 1.4 1996/11/09 03:26:27 chuck Exp $       */
   4
   5 /*
   6  *
   7  * Copyright (c) 1996 Charles D. Cranor and Washington University.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by Charles D. Cranor and
  21  *      Washington University.
  22  * 4. The name of the author may not be used to endorse or promote products
  23  *    derived from this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  26  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  28  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  29  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 /*
  38  * atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
  39  * from trying to use each other's VCs.
  40  */
  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 #include <sys/thread2.h>
  48
  49 #include <net/if.h>
  50
  51 #include <netinet/in.h>
  52
  53 #include "natm.h"
  54
  55 struct npcblist natm_pcbs;
  56
  57 /*
  58  * npcb_alloc: allocate a npcb [in the free state]
  59  */
  60
  61 struct natmpcb *
  62 npcb_alloc(int wait)
  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   return(npcb);
  75 }
  76
  77
  78 /*
  79  * npcb_free: free a npcb
  80  */
  81
  82 void
  83 npcb_free(struct natmpcb *npcb, int op)
  84 {
  85   crit_enter();
  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 distruction */
  94     } else {
  95       FREE(npcb, M_PCB);                /* kill it! */
  96     }
  97   }
  98
  99   crit_exit();
 100 }
 101
 102
 103 /*
 104  * npcb_add: add or remove npcb from main list
 105  *   returns npcb if ok
 106  */
 107
 108 struct natmpcb *
 109 npcb_add(struct natmpcb *npcb, struct ifnet *ifp, int vci, int vpi)
 110 {
 111   struct natmpcb *cpcb = NULL;          /* current pcb */
 112
 113   crit_enter();
 114   /*
 115    * lookup required
 116    */
 117
 118   for (cpcb = natm_pcbs.lh_first ; cpcb != NULL ;
 119                                         cpcb = cpcb->pcblist.le_next) {
 120     if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci && vpi == cpcb->npcb_vpi)
 121       break;
 122   }
 123
 124   /*
 125    * add & something already there?
 126    */
 127
 128   if (cpcb) {
 129     cpcb = NULL;
 130     goto done;                                  /* fail */
 131   }
 132
 133   /*
 134    * need to allocate a pcb?
 135    */
 136
 137   if (npcb == NULL) {
 138     cpcb = npcb_alloc(M_NOWAIT);        /* could be called from lower half */
 139     if (cpcb == NULL)
 140       goto done;                        /* fail */
 141   } else {
 142     cpcb = npcb;
 143   }
 144
 145   cpcb->npcb_ifp = ifp;
 146   cpcb->ipaddr.s_addr = 0;
 147   cpcb->npcb_vci = vci;
 148   cpcb->npcb_vpi = vpi;
 149   cpcb->npcb_flags = NPCB_CONNECTED;
 150
 151   LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
 152
 153 done:
 154   crit_exit();
 155   return(cpcb);
 156 }
 157
 158
 159
 160 #ifdef DDB
 161
 162 int npcb_dump(void);
 163
 164 int
 165 npcb_dump(void)
 166 {
 167   struct natmpcb *cpcb;
 168
 169   kprintf("npcb dump:\n");
 170   for (cpcb = natm_pcbs.lh_first ; cpcb != NULL ;
 171                                         cpcb = cpcb->pcblist.le_next) {
 172     kprintf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, inq=%d\n",
 173         cpcb->npcb_ifp->if_xname, cpcb->npcb_vci, cpcb->npcb_vpi,
 174         cpcb->ipaddr.s_addr, cpcb->npcb_socket,
 175         cpcb->npcb_flags, cpcb->npcb_inq);
 176   }
 177   kprintf("done\n");
 178   return(0);
 179 }
 180
 181 #endif