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      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 }
    108