bsd/netat/at_pcb.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*
  30  *      Copyright (c) 1997-1999 Apple Computer, Inc.
  31  *      All Rights Reserved.
  32  */
  33 /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
  34 /*
  35  * Copyright (c) 1982, 1986, 1991, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)at_pcb.c    8.2 (Berkeley) 1/4/94
  67  */
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/malloc.h>
  72 #include <sys/mbuf.h>
  73 #include <sys/protosw.h>
  74 #include <sys/socket.h>
  75 #include <sys/socketvar.h>
  76 #include <sys/ioctl.h>
  77 #include <sys/errno.h>
  78 #include <sys/time.h>
  79 #include <sys/proc.h>
  80 #include <kern/kern_types.h>
  81 #include <kern/zalloc.h>
  82 #include <kern/queue.h>
  83
  84 #include <net/if.h>
  85
  86 #include <netat/sysglue.h>
  87 #include <netat/appletalk.h>
  88 #include <netat/ddp.h>
  89 #include <netat/at_pcb.h>
  90 #include <netat/debug.h>
  91 #include <netat/at_var.h>
  92 #include <netat/adsp.h>
  93 #include <netat/adsp_internal.h>
  94
  95 extern struct atpcb ddp_head;
  96 extern struct atpcb *atp_inputQ[];
  97 extern CCB *adsp_inputQ[];
  98 extern at_ifaddr_t *ifID_home;
  99 extern struct {
 100   ddp_handler_func func;
 101   } ddp_handler[];
 102
 103 int DDP_chksum_on = FALSE;
 104 int DDP_slfsnd_on = FALSE;
 105
 106 zone_t atpcb_zone;
 107
 108 void at_memzone_init(void)
 109 {
 110         vm_size_t str_size;
 111
 112         str_size = (vm_size_t)sizeof(struct atpcb);
 113         atpcb_zone = (zone_t)zinit(str_size, 1000*str_size, 8192, "atpcb zone");
 114 }
 115
 116 int at_pcballoc(so, head)
 117         struct socket *so;
 118         struct atpcb *head;
 119 {
 120         register struct atpcb *pcb;
 121
 122         pcb = (struct atpcb *)zalloc(atpcb_zone);
 123         if (pcb == NULL)
 124                 return (ENOBUFS);
 125         bzero((caddr_t)pcb, sizeof(*pcb));
 126
 127         /* set the flags to the system defaults */
 128         if (DDP_chksum_on)
 129                 pcb->ddp_flags |= DDPFLG_CHKSUM;
 130         else
 131                 pcb->ddp_flags &= ~DDPFLG_CHKSUM;
 132         if (DDP_slfsnd_on)
 133                 pcb->ddp_flags |= DDPFLG_SLFSND;
 134         else
 135                 pcb->ddp_flags &= ~DDPFLG_SLFSND;
 136
 137         pcb->atpcb_head = head;
 138         pcb->atpcb_socket = so;
 139         atalk_lock();   /* makes sure the list is locked while inserting atpcb */
 140         if (head)
 141             insque((queue_t)pcb, (queue_t)head);
 142         so->so_pcb = (caddr_t)pcb;
 143         atalk_unlock();
 144
 145         return (0);
 146 }
 147
 148 int at_pcbdetach(pcb)
 149         struct atpcb *pcb;
 150 {
 151         struct socket *so = pcb->atpcb_socket;
 152
 153         /* Notify NBP that we are closing this DDP socket */
 154         if (pcb->lport) {
 155                 ddp_notify_nbp(pcb->lport, pcb->pid, pcb->ddptype);
 156                 pcb->lport = 0;
 157         }
 158
 159         so->so_pcb = 0;
 160         so->so_flags |= SOF_PCBCLEARING;
 161         if ((pcb->atpcb_next) && (pcb->atpcb_prev))
 162             remque((queue_t)pcb);
 163         zfree(atpcb_zone, pcb);
 164         sofree(so);
 165         return(0);
 166 }
 167
 168 int ddp_socket_inuse(ddpsock, proto)
 169           u_char ddpsock, proto;
 170 {
 171           struct atpcb *pcb;
 172
 173           if ((!proto || (proto == DDP_ATP)) && atp_inputQ[ddpsock])
 174                 return TRUE;
 175           if ((!proto || (proto == DDP_ADSP)) && adsp_inputQ[ddpsock])
 176                 return TRUE;
 177           if (ddp_handler[ddpsock].func)
 178                 return TRUE;
 179           for (pcb = ddp_head.atpcb_next; pcb != &ddp_head;
 180                pcb = pcb->atpcb_next) {
 181                 if (pcb->lport == ddpsock &&
 182                     (!pcb->ddptype || !proto || (pcb->ddptype == proto)))
 183                         return TRUE;
 184           }
 185           return FALSE;
 186 }
 187
 188 int at_pcbbind(pcb, nam)
 189         register struct atpcb *pcb;
 190         struct sockaddr *nam;
 191 {
 192         register struct sockaddr_at *local = (struct sockaddr_at *) nam;
 193         u_char ddpsock = local->sat_port;
 194
 195         if ((!ifID_home) || (local->sat_family != AF_APPLETALK))
 196                 return(EADDRNOTAVAIL);
 197
 198         if (pcb->lport != ATADDR_ANYPORT ||
 199             pcb->laddr.s_node != ATADDR_ANYNODE ||
 200             pcb->laddr.s_net != ATADDR_ANYNET)
 201                 return(EINVAL);
 202
 203         /* Request for dynamic socket? */
 204         if (ddpsock == 0) {
 205                 /* Search table for free one */
 206                 /* *** borrow IP algorithm, instead? *** */
 207                 for (ddpsock = DDP_SOCKET_LAST;
 208                      ddpsock >= (DDP_SOCKET_1st_DYNAMIC + 1);
 209                                                 /* sip has 1st */
 210                      ddpsock--) {
 211                         if (! ddp_socket_inuse(ddpsock, pcb->ddptype))
 212                                 break;
 213                 }
 214                 if (ddpsock < (DDP_SOCKET_1st_DYNAMIC + 1))
 215                         return(EADDRNOTAVAIL);  /* Error if no free sockets */
 216         } else {
 217                 /* Asking to open a socket by its number.
 218                    Check if its legal & free. */
 219                 if (ddpsock > DDP_SOCKET_LAST)
 220                         return(EINVAL);
 221                 if (ddp_socket_inuse(ddpsock, pcb->ddptype))
 222                         return(EADDRNOTAVAIL);
 223         }
 224
 225         pcb->lport = ddpsock;
 226         /* if address is specified, make sure address matches one of the
 227            interfaces configured for AppleTalk */
 228         if (local->sat_addr.s_net || local->sat_addr.s_node) {
 229             if (MULTIHOME_MODE) {
 230                 at_ifaddr_t *ifID;
 231                 TAILQ_FOREACH(ifID, &at_ifQueueHd, aa_link) {
 232                         if (ifID->ifThisNode.s_net == local->sat_addr.s_net &&
 233                             ifID->ifThisNode.s_node == local->sat_addr.s_node) {
 234                                 pcb->laddr = local->sat_addr;
 235                                 return(0);
 236                         }
 237                 }
 238                 return(EINVAL);
 239             } else {
 240               /* for single-port and router modes if the local address is
 241                  specified, it must match the default interface, which is
 242                  what will be put into packets' source address anyway */
 243                 if (ifID_home->ifThisNode.s_net == local->sat_addr.s_net &&
 244                     ifID_home->ifThisNode.s_node == local->sat_addr.s_node) {
 245                         pcb->laddr = local->sat_addr;
 246                         return(0);
 247                 }
 248                 return(EINVAL);
 249
 250             }
 251         }
 252         return(0);
 253 }