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 2008 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/*
29 * Minor number allocation for various protocol modules.
30 */
31
32#include <sys/types.h>
33#include <sys/kmem.h>
34#include <sys/mutex.h>
35#include <sys/ddi.h>
36#include <sys/types.h>
37#include <sys/mkdev.h>
38#include <sys/param.h>
39#include <inet/common.h>
40
41typedef struct inet_arena {
42	vmem_t *ineta_arena;	/* Minor number arena */
43	minor_t ineta_maxminor;	/* max minor number in the arena */
44} inet_arena_t;
45
46void *
47inet_minor_create(char *name, dev_t min_dev, dev_t max_dev, int kmflags)
48{
49	inet_arena_t *arena = kmem_alloc(sizeof (inet_arena_t), kmflags);
50
51	if (arena != NULL) {
52		arena->ineta_maxminor = max_dev;
53		arena->ineta_arena = vmem_create(name,
54		    (void *)min_dev, arena->ineta_maxminor - min_dev + 1,
55		    1, NULL, NULL, NULL, 1, kmflags | VMC_IDENTIFIER);
56
57		if (arena->ineta_arena == NULL) {
58			kmem_free(arena, sizeof (inet_arena_t));
59			arena = NULL;
60		}
61	}
62
63	return (arena);
64}
65
66void
67inet_minor_destroy(void *a)
68{
69	inet_arena_t *arena = (inet_arena_t *)a;
70
71	if (arena != NULL) {
72		vmem_destroy(arena->ineta_arena);
73		kmem_free(arena, sizeof (inet_arena_t));
74	}
75}
76
77dev_t
78inet_minor_alloc(void *arena)
79{
80	return ((dev_t)vmem_alloc(((inet_arena_t *)arena)->ineta_arena,
81	    1, VM_NOSLEEP));
82}
83
84void
85inet_minor_free(void *arena, dev_t dev)
86{
87	ASSERT((dev != OPENFAIL) && (dev != 0) && (dev <= MAXMIN));
88	vmem_free(((inet_arena_t *)arena)->ineta_arena, (void *)dev, 1);
89}
90
91/*
92 * This function is used to free a message that has gone through
93 * mi_copyin processing which modifies the M_IOCTL mblk's b_next
94 * and b_prev pointers. We use this function to set b_next/b_prev
95 * to NULL and free them.
96 */
97void
98inet_freemsg(mblk_t *mp)
99{
100	mblk_t	*bp = mp;
101
102	for (; bp != NULL; bp = bp->b_cont) {
103		bp->b_prev = NULL;
104		bp->b_next = NULL;
105	}
106	freemsg(mp);
107}
108