linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __6LOWPAN_NHC_H

#define __6LOWPAN_NHC_H

​

#include <linux/skbuff.h>

#include <linux/rbtree.h>

#include <linux/module.h>

​

#include <net/6lowpan.h>

#include <net/ipv6.h>

​

/**

 * LOWPAN_NHC - helper macro to generate nh id fields and lowpan_nhc struct

 *

 * @__nhc: variable name of the lowpan_nhc struct.

 * @_name: const char * of common header compression name.

 * @_nexthdr: ipv6 nexthdr field for the header compression.

 * @_nexthdrlen: ipv6 nexthdr len for the reserved space.

 * @_idsetup: callback to setup id and mask values.

 * @_idlen: len for the next header id and mask, should be always the same.

 * @_uncompress: callback for uncompression call.

 * @_compress: callback for compression call.

 */

#define LOWPAN_NHC(__nhc, _name, _nexthdr,  \

           _hdrlen, _idsetup, _idlen,   \

           _uncompress, _compress)  \

static u8 __nhc##_val[_idlen];          \

static u8 __nhc##_mask[_idlen];         \

static struct lowpan_nhc __nhc = {      \

    .name       = _name,        \

    .nexthdr    = _nexthdr,     \

    .nexthdrlen = _hdrlen,      \

    .id     = __nhc##_val,      \

    .idmask     = __nhc##_mask,     \

    .idlen      = _idlen,       \

    .idsetup    = _idsetup,     \

    .uncompress = _uncompress,      \

    .compress   = _compress,        \

}

​

#define module_lowpan_nhc(__nhc)        \

static int __init __nhc##_init(void)        \

{                       \

    return lowpan_nhc_add(&(__nhc));    \

}                       \

module_init(__nhc##_init);          \

static void __exit __nhc##_exit(void)       \

{                       \

    lowpan_nhc_del(&(__nhc));       \

}                       \

module_exit(__nhc##_exit);

​

/**

 * struct lowpan_nhc - hold 6lowpan next hdr compression ifnformation

 *

 * @node: holder for the rbtree.

 * @name: name of the specific next header compression

 * @nexthdr: next header value of the protocol which should be compressed.

 * @nexthdrlen: ipv6 nexthdr len for the reserved space.

 * @id: array for nhc id. Note this need to be in network byteorder.

 * @mask: array for nhc id mask. Note this need to be in network byteorder.

 * @len: the length of the next header id and mask.

 * @setup: callback to setup fill the next header id value and mask.