xref: /titanic_44/usr/src/uts/common/inet/ip/ip_dummy.c (revision 56b2bdd1f04d465cfe4a95b88ae5cba5884154e4)
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