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 * 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 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 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 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 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