bsd/netat/at_pcb.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22
  23 /*
  24  *      Copyright (c) 1997-1999 Apple Computer, Inc.
  25  *      All Rights Reserved.
  26  */
  27 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  28 /*
  29  * Copyright (c) 1982, 1986, 1991, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)at_pcb.c    8.2 (Berkeley) 1/4/94
  61  */
  62
  63 #include <sys/param.h>
  64 #include <sys/systm.h>
  65 #include <sys/malloc.h>
  66 #include <sys/mbuf.h>
  67 #include <sys/protosw.h>
  68 #include <sys/socket.h>
  69 #include <sys/socketvar.h>
  70 #include <sys/ioctl.h>
  71 #include <sys/errno.h>
  72 #include <sys/time.h>
  73 #include <sys/proc.h>
  74 #include <kern/kern_types.h>
  75 #include <kern/zalloc.h>
  76 #include <kern/queue.h>
  77
  78 #include <net/if.h>
  79
  80 #include <netat/sysglue.h>
  81 #include <netat/appletalk.h>
  82 #include <netat/ddp.h>
  83 #include <netat/at_pcb.h>
  84 #include <netat/debug.h>
  85 #include <netat/at_var.h>
  86 #include <netat/adsp.h>
  87 #include <netat/adsp_internal.h>
  88
  89 extern struct atpcb ddp_head;
  90 extern struct atpcb *atp_inputQ[];
  91 extern CCB *adsp_inputQ[];
  92 extern at_ifaddr_t *ifID_home;
  93 extern struct {
  94   void (*func)();
  95   } ddp_handler[];
  96
  97 int DDP_chksum_on = FALSE;
  98 int DDP_slfsnd_on = FALSE;
  99
 100 zone_t atpcb_zone;
 101
 102 void at_memzone_init()
 103 {
 104         vm_size_t str_size;
 105
 106         str_size = (vm_size_t)sizeof(struct atpcb);
 107         atpcb_zone = (zone_t)zinit(str_size, 1000*str_size, 8192, "atpcb zone");
 108 }
 109
 110 int at_pcballoc(so, head)
 111         struct socket *so;
 112         struct atpcb *head;
 113 {
 114         register struct atpcb *pcb;
 115
 116         pcb = (struct atpcb *)zalloc(atpcb_zone);
 117         if (pcb == NULL)
 118                 return (ENOBUFS);
 119         bzero((caddr_t)pcb, sizeof(*pcb));
 120
 121         /* set the flags to the system defaults */
 122         if (DDP_chksum_on)
 123                 pcb->ddp_flags |= DDPFLG_CHKSUM;
 124         else
 125                 pcb->ddp_flags &= ~DDPFLG_CHKSUM;
 126         if (DDP_slfsnd_on)
 127                 pcb->ddp_flags |= DDPFLG_SLFSND;
 128         else
 129                 pcb->ddp_flags &= ~DDPFLG_SLFSND;
 130
 131         pcb->atpcb_head = head;
 132         pcb->atpcb_socket = so;
 133         atalk_lock();   /* makes sure the list is locked while inserting atpcb */
 134         if (head)
 135             insque((queue_t)pcb, (queue_t)head);
 136         so->so_pcb = (caddr_t)pcb;
 137         atalk_unlock();
 138
 139         return (0);
 140 }
 141
 142 int at_pcbdetach(pcb)
 143         struct atpcb *pcb;
 144 {
 145         struct socket *so = pcb->atpcb_socket;
 146
 147         /* Notify NBP that we are closing this DDP socket */
 148         if (pcb->lport) {
 149                 ddp_notify_nbp(pcb->lport, pcb->pid, pcb->ddptype);
 150                 pcb->lport = 0;
 151         }
 152
 153         so->so_pcb = 0;
 154         so->so_flags |= SOF_PCBCLEARING;
 155         if ((pcb->atpcb_next) && (pcb->atpcb_prev))
 156             remque((queue_t)pcb);
 157         zfree(atpcb_zone, pcb);
 158         sofree(so);
 159         return(0);
 160 }
 161
 162 int ddp_socket_inuse(ddpsock, proto)
 163           u_char ddpsock, proto;
 164 {
 165           struct atpcb *pcb;
 166
 167           if ((!proto || (proto == DDP_ATP)) && atp_inputQ[ddpsock])
 168                 return TRUE;
 169           if ((!proto || (proto == DDP_ADSP)) && adsp_inputQ[ddpsock])
 170                 return TRUE;
 171           if (ddp_handler[ddpsock].func)
 172                 return TRUE;
 173           for (pcb = ddp_head.atpcb_next; pcb != &ddp_head;
 174                pcb = pcb->atpcb_next) {
 175                 if (pcb->lport == ddpsock &&
 176                     (!pcb->ddptype || !proto || (pcb->ddptype == proto)))
 177                         return TRUE;
 178           }
 179           return FALSE;
 180 }
 181
 182 int at_pcbbind(pcb, nam)
 183         register struct atpcb *pcb;
 184         struct sockaddr *nam;
 185 {
 186         register struct socket *so = pcb->atpcb_socket;
 187         register struct sockaddr_at *local = (struct sockaddr_at *) nam;
 188         u_char ddpsock = local->sat_port;
 189
 190         if ((!ifID_home) || (local->sat_family != AF_APPLETALK))
 191                 return(EADDRNOTAVAIL);
 192
 193         if (pcb->lport != ATADDR_ANYPORT ||
 194             pcb->laddr.s_node != ATADDR_ANYNODE ||
 195             pcb->laddr.s_net != ATADDR_ANYNET)
 196                 return(EINVAL);
 197
 198         /* Request for dynamic socket? */
 199         if (ddpsock == 0) {
 200                 /* Search table for free one */
 201                 /* *** borrow IP algorithm, instead? *** */
 202                 for (ddpsock = DDP_SOCKET_LAST;
 203                      ddpsock >= (DDP_SOCKET_1st_DYNAMIC + 1);
 204                                                 /* sip has 1st */
 205                      ddpsock--) {
 206                         if (! ddp_socket_inuse(ddpsock, pcb->ddptype))
 207                                 break;
 208                 }
 209                 if (ddpsock < (DDP_SOCKET_1st_DYNAMIC + 1))
 210                         return(EADDRNOTAVAIL);  /* Error if no free sockets */
 211         } else {
 212                 /* Asking to open a socket by its number.
 213                    Check if its legal & free. */
 214                 if (ddpsock > DDP_SOCKET_LAST)
 215                         return(EINVAL);
 216                 if (ddp_socket_inuse(ddpsock, pcb->ddptype))
 217                         return(EADDRNOTAVAIL);
 218         }
 219
 220         pcb->lport = ddpsock;
 221         /* if address is specified, make sure address matches one of the
 222            interfaces configured for AppleTalk */
 223         if (local->sat_addr.s_net || local->sat_addr.s_node) {
 224             if (MULTIHOME_MODE) {
 225                 at_ifaddr_t *ifID;
 226                 TAILQ_FOREACH(ifID, &at_ifQueueHd, aa_link) {
 227                         if (ifID->ifThisNode.s_net == local->sat_addr.s_net &&
 228                             ifID->ifThisNode.s_node == local->sat_addr.s_node) {
 229                                 pcb->laddr = local->sat_addr;
 230                                 return(0);
 231                         }
 232                 }
 233                 return(EINVAL);
 234             } else {
 235               /* for single-port and router modes if the local address is
 236                  specified, it must match the default interface, which is
 237                  what will be put into packets' source address anyway */
 238                 if (ifID_home->ifThisNode.s_net == local->sat_addr.s_net &&
 239                     ifID_home->ifThisNode.s_node == local->sat_addr.s_node) {
 240                         pcb->laddr = local->sat_addr;
 241                         return(0);
 242                 }
 243                 return(EINVAL);
 244
 245             }
 246         }
 247         return(0);
 248 }