kernel/net/inet_common.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 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
  41 typedef 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
  46 void *
  47 inet_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
  66 void
  67 inet_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
  77 dev_t
  78 inet_minor_alloc(void *arena)
  79 {
  80         return ((dev_t)vmem_alloc(((inet_arena_t *)arena)->ineta_arena,
  81             1, VM_NOSLEEP));
  82 }
  83
  84 void
  85 inet_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  */
  97 void
  98 inet_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 }