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      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 }
     91