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 #include <sys/types.h>
  27 #include <sys/conf.h>
  28 #include <sys/modctl.h>
  29 #include <inet/common.h>
  30
  31 /*
  32  * Dummy streams module that is used by ICMP, UDP, and TCP by setting
  33  * INETMODSTRTAB to dummymodinfo
  34  *
  35  * It's reason for existance is so that mibopen() that I_PUSH icmp, udp, and
  36  * tcp can continue to push modules with those names, even though all the
  37  * MIB information comes from IP.
  38  */
  39
  40 static int      dummy_wput(queue_t *, mblk_t *);
  41 static int      dummy_modclose(queue_t *, int, cred_t *);
  42 static int      dummy_modopen(queue_t *q, dev_t *devp, int flag,
  43                     int sflag, cred_t *credp);
  44
  45 /*
  46  * This is common code for the tcp, udp, and icmp streams module which is
  47  * an empty STREAMS module provided for compatibility for mibopen()
  48  * code which I_PUSH modules with those names.
  49  */
  50 struct module_info dummy_mod_info = {
  51         5799, "dummymod", 1, INFPSZ, 65536, 1024
  52 };
  53
  54
  55 static struct qinit dummyrmodinit = {
  56         dummy_wput, NULL, dummy_modopen, dummy_modclose, NULL,
  57         &dummy_mod_info
  58 };
  59
  60 static struct qinit dummywmodinit = {
  61         dummy_wput, NULL, NULL, NULL, NULL, &dummy_mod_info
  62 };
  63
  64 struct streamtab dummymodinfo = {
  65         &dummyrmodinit, &dummywmodinit
  66 };
  67
  68 /* ARGSUSED */
  69 static int
  70 dummy_wput(queue_t *q, mblk_t *m)
  71 {
  72         putnext(q, m);
  73         return (0);
  74 }
  75
  76 static int
  77 dummy_modclose(queue_t *q, int flags __unused, cred_t *credp __unused)
  78 {
  79         qprocsoff(q);
  80         return (0);
  81 }
  82
  83 /* ARGSUSED */
  84 static int
  85 dummy_modopen(queue_t *q, dev_t *devp, int flag, int sflag, cred_t *credp)
  86 {
  87         /* If the stream is already open, return immediately. */
  88         if (q->q_ptr != NULL)
  89                 return (0);
  90
  91         /* If this is not a push of dummy as a module, fail. */
  92         if (sflag != MODOPEN)
  93                 return (EINVAL);
  94
  95         qprocson(q);
  96         return (0);
  97 }