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 /*
27 * Minor number allocation for various protocol modules.
28 */
29
30 #include <sys/types.h>
31 #include <sys/kmem.h>
32 #include <sys/mutex.h>
33 #include <sys/ddi.h>
34 #include <sys/types.h>
35 #include <sys/mkdev.h>
36 #include <sys/param.h>
37 #include <inet/common.h>
38
39 typedef struct inet_arena {
40 vmem_t *ineta_arena; /* Minor number arena */
41 minor_t ineta_maxminor; /* max minor number in the arena */
42 } inet_arena_t;
43
44 void *
inet_minor_create(char * name,dev_t min_dev,dev_t max_dev,int kmflags)45 inet_minor_create(char *name, dev_t min_dev, dev_t max_dev, int kmflags)
46 {
47 inet_arena_t *arena = kmem_alloc(sizeof (inet_arena_t), kmflags);
48
49 if (arena != NULL) {
50 arena->ineta_maxminor = max_dev;
51 arena->ineta_arena = vmem_create(name,
52 (void *)min_dev, arena->ineta_maxminor - min_dev + 1,
53 1, NULL, NULL, NULL, 1, kmflags | VMC_IDENTIFIER);
54
55 if (arena->ineta_arena == NULL) {
56 kmem_free(arena, sizeof (inet_arena_t));
57 arena = NULL;
58 }
59 }
60
61 return (arena);
62 }
63
64 void
inet_minor_destroy(void * a)65 inet_minor_destroy(void *a)
66 {
67 inet_arena_t *arena = (inet_arena_t *)a;
68
69 if (arena != NULL) {
70 vmem_destroy(arena->ineta_arena);
71 kmem_free(arena, sizeof (inet_arena_t));
72 }
73 }
74
75 dev_t
inet_minor_alloc(void * arena)76 inet_minor_alloc(void *arena)
77 {
78 return ((dev_t)vmem_alloc(((inet_arena_t *)arena)->ineta_arena,
79 1, VM_NOSLEEP));
80 }
81
82 void
inet_minor_free(void * arena,dev_t dev)83 inet_minor_free(void *arena, dev_t dev)
84 {
85 ASSERT((dev != OPENFAIL) && (dev != 0) && (dev <= MAXMIN));
86 vmem_free(((inet_arena_t *)arena)->ineta_arena, (void *)dev, 1);
87 }
88
89 /*
90 * This function is used to free a message that has gone through
91 * mi_copyin processing which modifies the M_IOCTL mblk's b_next
92 * and b_prev pointers. We use this function to set b_next/b_prev
93 * to NULL and free them.
94 */
95 void
inet_freemsg(mblk_t * mp)96 inet_freemsg(mblk_t *mp)
97 {
98 mblk_t *bp = mp;
99
100 for (; bp != NULL; bp = bp->b_cont) {
101 bp->b_prev = NULL;
102 bp->b_next = NULL;
103 }
104 freemsg(mp);
105 }
106