kernel/net/ip/ip_dummy.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "%Z%%M% %I%     %E% SMI"
  27
  28 #include <sys/types.h>
  29 #include <sys/conf.h>
  30 #include <sys/modctl.h>
  31 #include <inet/common.h>
  32
  33 /*
  34  * Dummy streams module that is used by ICMP, UDP, and TCP by setting
  35  * INETMODSTRTAB to dummymodinfo
  36  *
  37  * It's reason for existance is so that mibopen() that I_PUSH icmp, udp, and
  38  * tcp can continue to push modules with those names, even though all the
  39  * MIB information comes from IP.
  40  */
  41
  42 static int      dummy_modclose(queue_t *q);
  43 static int      dummy_modopen(queue_t *q, dev_t *devp, int flag,
  44                     int sflag, cred_t *credp);
  45
  46 /*
  47  * This is common code for the tcp, udp, and icmp streams module which is
  48  * an empty STREAMS module provided for compatibility for mibopen()
  49  * code which I_PUSH modules with those names.
  50  */
  51 struct module_info dummy_mod_info = {
  52         5799, "dummymod", 1, INFPSZ, 65536, 1024
  53 };
  54
  55
  56 static struct qinit dummyrmodinit = {
  57         (pfi_t)putnext, NULL, dummy_modopen, dummy_modclose, NULL,
  58         &dummy_mod_info
  59 };
  60
  61 static struct qinit dummywmodinit = {
  62         (pfi_t)putnext, NULL, NULL, NULL, NULL, &dummy_mod_info
  63 };
  64
  65 struct streamtab dummymodinfo = {
  66         &dummyrmodinit, &dummywmodinit
  67 };
  68
  69 static int
  70 dummy_modclose(queue_t *q)
  71 {
  72         qprocsoff(q);
  73         return (0);
  74 }
  75
  76 /* ARGSUSED */
  77 static int
  78 dummy_modopen(queue_t *q, dev_t *devp, int flag, int sflag, cred_t *credp)
  79 {
  80         /* If the stream is already open, return immediately. */
  81         if (q->q_ptr != NULL)
  82                 return (0);
  83
  84         /* If this is not a push of dummy as a module, fail. */
  85         if (sflag != MODOPEN)
  86                 return (EINVAL);
  87
  88         qprocson(q);
  89         return (0);
  90 }