sys/netnatm/natm_pcb.c

   1 /*      $NetBSD: natm_pcb.c,v 1.12 2009/03/18 10:22:44 cegger Exp $     */
   2
   3 /*
   4  *
   5  * Copyright (c) 1996 Charles D. Cranor and Washington University.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by Charles D. Cranor and
  19  *      Washington University.
  20  * 4. The name of the author may not be used to endorse or promote products
  21  *    derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * atm_pcb.c: manage atm protocol control blocks and keep IP and NATM
  37  * from trying to use each other's VCs.
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __KERNEL_RCSID(0, "$NetBSD: natm_pcb.c,v 1.12 2009/03/18 10:22:44 cegger Exp $");
  42
  43 #include "opt_ddb.h"
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/queue.h>
  48 #include <sys/socket.h>
  49 #include <sys/protosw.h>
  50 #include <sys/domain.h>
  51 #include <sys/mbuf.h>
  52 #include <sys/malloc.h>
  53
  54 #include <net/if.h>
  55 #include <net/radix.h>
  56 #include <net/route.h>
  57
  58 #include <netinet/in.h>
  59
  60 #include <netnatm/natm.h>
  61
  62 /*
  63  * npcb_alloc: allocate a npcb [in the free state]
  64  */
  65
  66 struct natmpcb *npcb_alloc(wait)
  67
  68 int wait;
  69
  70 {
  71   struct natmpcb *npcb;
  72
  73   npcb = malloc(sizeof(*npcb), M_PCB, wait);
  74
  75 #ifdef DIAGNOSTIC
  76   if (wait == M_WAITOK && npcb == NULL) panic("npcb_alloc: malloc didn't wait");
  77 #endif
  78
  79   if (npcb) {
  80     memset(npcb, 0, sizeof(*npcb));
  81     npcb->npcb_flags = NPCB_FREE;
  82   }
  83   return(npcb);
  84 }
  85
  86
  87 /*
  88  * npcb_free: free a npcb
  89  */
  90
  91 void npcb_free(npcb, op)
  92
  93 struct natmpcb *npcb;
  94 int op;
  95
  96 {
  97   int s = splnet();
  98
  99   if ((npcb->npcb_flags & NPCB_FREE) == 0) {
 100     LIST_REMOVE(npcb, pcblist);
 101     npcb->npcb_flags = NPCB_FREE;
 102   }
 103   if (op == NPCB_DESTROY) {
 104     if (npcb->npcb_inq) {
 105       npcb->npcb_flags = NPCB_DRAIN;    /* flag for distruction */
 106     } else {
 107       free(npcb, M_PCB);                /* kill it! */
 108     }
 109   }
 110
 111   splx(s);
 112 }
 113
 114
 115 /*
 116  * npcb_add: add or remove npcb from main list
 117  *   returns npcb if ok
 118  */
 119
 120 struct natmpcb *npcb_add(npcb, ifp, vci, vpi)
 121
 122 struct natmpcb *npcb;
 123 struct ifnet *ifp;
 124 u_int16_t vci;
 125 u_int8_t vpi;
 126
 127 {
 128   struct natmpcb *cpcb = NULL;          /* current pcb */
 129   int s = splnet();
 130
 131
 132   /*
 133    * lookup required
 134    */
 135
 136   for (cpcb = natm_pcbs.lh_first ; cpcb != NULL ;
 137                                         cpcb = cpcb->pcblist.le_next) {
 138     if (ifp == cpcb->npcb_ifp && vci == cpcb->npcb_vci && vpi == cpcb->npcb_vpi)
 139       break;
 140   }
 141
 142   /*
 143    * add & something already there?
 144    */
 145
 146   if (cpcb) {
 147     cpcb = NULL;
 148     goto done;                                  /* fail */
 149   }
 150
 151   /*
 152    * need to allocate a pcb?
 153    */
 154
 155   if (npcb == NULL) {
 156     cpcb = npcb_alloc(M_NOWAIT);        /* could be called from lower half */
 157     if (cpcb == NULL)
 158       goto done;                        /* fail */
 159   } else {
 160     cpcb = npcb;
 161   }
 162
 163   cpcb->npcb_ifp = ifp;
 164   cpcb->ipaddr.s_addr = 0;
 165   cpcb->npcb_vci = vci;
 166   cpcb->npcb_vpi = vpi;
 167   cpcb->npcb_flags = NPCB_CONNECTED;
 168
 169   LIST_INSERT_HEAD(&natm_pcbs, cpcb, pcblist);
 170
 171 done:
 172   splx(s);
 173   return(cpcb);
 174 }
 175
 176
 177
 178 #ifdef DDB
 179
 180 int npcb_dump(void);
 181
 182 int npcb_dump(void)
 183
 184 {
 185   struct natmpcb *cpcb;
 186
 187   printf("npcb dump:\n");
 188   for (cpcb = natm_pcbs.lh_first ; cpcb != NULL ;
 189                                         cpcb = cpcb->pcblist.le_next) {
 190     printf("if=%s, vci=%d, vpi=%d, IP=0x%x, sock=%p, flags=0x%x, inq=%d\n",
 191         cpcb->npcb_ifp->if_xname, cpcb->npcb_vci, cpcb->npcb_vpi,
 192         cpcb->ipaddr.s_addr, cpcb->npcb_socket,
 193         cpcb->npcb_flags, cpcb->npcb_inq);
 194   }
 195   printf("done\n");
 196   return(0);
 197 }
 198
 199 #endif