[linux-2.6-block.git] / include / net / 6lowpan.h

/*
 * Copyright 2011, Siemens AG
 * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
 */

/*
 * Based on patches from Jon Smirl <jonsmirl@gmail.com>
 * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/* Jon's code is based on 6lowpan implementation for Contiki which is:
 * Copyright (c) 2008, Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef __6LOWPAN_H__
#define __6LOWPAN_H__

#include <net/ipv6.h>
#include <net/net_namespace.h>

#define EUI64_ADDR_LEN		8

#define LOWPAN_NHC_MAX_ID_LEN	1
/* Maximum next header compression length which we currently support inclusive
 * possible inline data.
 */
#define LOWPAN_NHC_MAX_HDR_LEN	(sizeof(struct udphdr))
/* Max IPHC Header len without IPv6 hdr specific inline data.
 * Useful for getting the "extra" bytes we need at worst case compression.
 *
 * LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN
 */
#define LOWPAN_IPHC_MAX_HEADER_LEN	(2 + 1 + LOWPAN_NHC_MAX_ID_LEN)
/* Maximum worst case IPHC header buffer size */
#define LOWPAN_IPHC_MAX_HC_BUF_LEN	(sizeof(struct ipv6hdr) +	\
					 LOWPAN_IPHC_MAX_HEADER_LEN +	\
					 LOWPAN_NHC_MAX_HDR_LEN)

#define LOWPAN_DISPATCH_IPV6		0x41 /* 01000001 = 65 */
#define LOWPAN_DISPATCH_IPHC		0x60 /* 011xxxxx = ... */
#define LOWPAN_DISPATCH_IPHC_MASK	0xe0

static inline bool lowpan_is_ipv6(u8 dispatch)
{
	return dispatch == LOWPAN_DISPATCH_IPV6;
}

static inline bool lowpan_is_iphc(u8 dispatch)
{
	return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC;
}

#define LOWPAN_PRIV_SIZE(llpriv_size)	\
	(sizeof(struct lowpan_priv) + llpriv_size)

enum lowpan_lltypes {
	LOWPAN_LLTYPE_BTLE,
	LOWPAN_LLTYPE_IEEE802154,
};

struct lowpan_priv {
	enum lowpan_lltypes lltype;

	/* must be last */
	u8 priv[0] __aligned(sizeof(void *));
};

static inline
struct lowpan_priv *lowpan_priv(const struct net_device *dev)
{
	return netdev_priv(dev);
}

struct lowpan_802154_cb {
	u16 d_tag;
	unsigned int d_size;
	u8 d_offset;
};

static inline
struct lowpan_802154_cb *lowpan_802154_cb(const struct sk_buff *skb)
{
	BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb));
	return (struct lowpan_802154_cb *)skb->cb;
}

#ifdef DEBUG
/* print data in line */
static inline void raw_dump_inline(const char *caller, char *msg,
				   const unsigned char *buf, int len)
{
	if (msg)
		pr_debug("%s():%s: ", caller, msg);

	print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false);
}

/* print data in a table format:
 *
 * addr: xx xx xx xx xx xx
 * addr: xx xx xx xx xx xx
 * ...
 */
static inline void raw_dump_table(const char *caller, char *msg,
				  const unsigned char *buf, int len)
{
	if (msg)
		pr_debug("%s():%s:\n", caller, msg);

	print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false);
}
#else
static inline void raw_dump_table(const char *caller, char *msg,
				  const unsigned char *buf, int len) { }
static inline void raw_dump_inline(const char *caller, char *msg,
				   const unsigned char *buf, int len) { }
#endif

/**
 * lowpan_fetch_skb - getting inline data from 6LoWPAN header
 *
 * This function will pull data from sk buffer and put it into data to
 * remove the 6LoWPAN inline data. This function returns true if the
 * sk buffer is too small to pull the amount of data which is specified
 * by len.
 *
 * @skb: the buffer where the inline data should be pulled from.
 * @data: destination buffer for the inline data.
 * @len: amount of data which should be pulled in bytes.
 */
static inline bool lowpan_fetch_skb(struct sk_buff *skb, void *data,
				    unsigned int len)
{
	if (unlikely(!pskb_may_pull(skb, len)))
		return true;

	skb_copy_from_linear_data(skb, data, len);
	skb_pull(skb, len);

	return false;
}

static inline void lowpan_push_hc_data(u8 **hc_ptr, const void *data,
				       const size_t len)
{
	memcpy(*hc_ptr, data, len);
	*hc_ptr += len;
}

void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype);

/**
 * lowpan_header_decompress - replace 6LoWPAN header with IPv6 header
 *
 * This function replaces the IPHC 6LoWPAN header which should be pointed at
 * skb->data and skb_network_header, with the IPv6 header.
 * It would be nice that the caller have the necessary headroom of IPv6 header
 * and greatest Transport layer header, this would reduce the overhead for
 * reallocate headroom.
 *
 * @skb: the buffer which should be manipulate.
 * @dev: the lowpan net device pointer.
 * @daddr: destination lladdr of mac header which is used for compression
 *	methods.
 * @saddr: source lladdr of mac header which is used for compression
 *	methods.
 */
int lowpan_header_decompress(struct sk_buff *skb, const struct net_device *dev,
			     const void *daddr, const void *saddr);

/**
 * lowpan_header_compress - replace IPv6 header with 6LoWPAN header
 *
 * This function replaces the IPv6 header which should be pointed at
 * skb->data and skb_network_header, with the IPHC 6LoWPAN header.
 * The caller need to be sure that the sk buffer is not shared and at have
 * at least a headroom which is smaller or equal LOWPAN_IPHC_MAX_HEADER_LEN,
 * which is the IPHC "more bytes than IPv6 header" at worst case.
 *
 * @skb: the buffer which should be manipulate.
 * @dev: the lowpan net device pointer.
 * @daddr: destination lladdr of mac header which is used for compression
 *	methods.
 * @saddr: source lladdr of mac header which is used for compression
 *	methods.
 */
int lowpan_header_compress(struct sk_buff *skb, const struct net_device *dev,
			   const void *daddr, const void *saddr);

#endif /* __6LOWPAN_H__ */
Commit	Line	Data
44331fe2 AS	1	/*
	2	* Copyright 2011, Siemens AG
	3	* written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
	4	*/
	5
	6	/*
	7	* Based on patches from Jon Smirl <jonsmirl@gmail.com>
	8	* Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2
	12	* as published by the Free Software Foundation.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	22	*/
	23
	24	/* Jon's code is based on 6lowpan implementation for Contiki which is:
	25	* Copyright (c) 2008, Swedish Institute of Computer Science.
	26	* All rights reserved.
	27	*
	28	* Redistribution and use in source and binary forms, with or without
	29	* modification, are permitted provided that the following conditions
	30	* are met:
	31	* 1. Redistributions of source code must retain the above copyright
	32	* notice, this list of conditions and the following disclaimer.
	33	* 2. Redistributions in binary form must reproduce the above copyright
	34	* notice, this list of conditions and the following disclaimer in the
	35	* documentation and/or other materials provided with the distribution.
	36	* 3. Neither the name of the Institute nor the names of its contributors
	37	* may be used to endorse or promote products derived from this software
	38	* without specific prior written permission.
	39	*
	40	* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
	41	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	42	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	43	* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
	44	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	45	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	46	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	47	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	48	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	49	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	50	* SUCH DAMAGE.
	51	*/
	52
	53	#ifndef __6LOWPAN_H__
	54	#define __6LOWPAN_H__
	55
91c69227	56	#include <net/ipv6.h>
17d8ecb8	57	#include <net/net_namespace.h>
91c69227	58
4d6a6aed AA	59	#define EUI64_ADDR_LEN 8
4d6a6aed AA	60
87a93e4e	61	#define LOWPAN_NHC_MAX_ID_LEN 1
bf513fd6 AA	62	/* Maximum next header compression length which we currently support inclusive
	63	* possible inline data.
	64	*/
	65	#define LOWPAN_NHC_MAX_HDR_LEN (sizeof(struct udphdr))
87a93e4e AA	66	/* Max IPHC Header len without IPv6 hdr specific inline data.
	67	* Useful for getting the "extra" bytes we need at worst case compression.
	68	*
	69	* LOWPAN_IPHC + CID + LOWPAN_NHC_MAX_ID_LEN
	70	*/
	71	#define LOWPAN_IPHC_MAX_HEADER_LEN (2 + 1 + LOWPAN_NHC_MAX_ID_LEN)
bf513fd6 AA	72	/* Maximum worst case IPHC header buffer size */
	73	#define LOWPAN_IPHC_MAX_HC_BUF_LEN (sizeof(struct ipv6hdr) + \
	74	LOWPAN_IPHC_MAX_HEADER_LEN + \
	75	LOWPAN_NHC_MAX_HDR_LEN)
87a93e4e	76
72a5e6bb AA	77	#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
	78	#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
	79	#define LOWPAN_DISPATCH_IPHC_MASK 0xe0
44331fe2	80
72a5e6bb AA	81	static inline bool lowpan_is_ipv6(u8 dispatch)
	82	{
	83	return dispatch == LOWPAN_DISPATCH_IPV6;
	84	}
	85
	86	static inline bool lowpan_is_iphc(u8 dispatch)
	87	{
	88	return (dispatch & LOWPAN_DISPATCH_IPHC_MASK) == LOWPAN_DISPATCH_IPHC;
	89	}
719269af	90
b72f6f51 AA	91	#define LOWPAN_PRIV_SIZE(llpriv_size) \
	92	(sizeof(struct lowpan_priv) + llpriv_size)
	93
	94	enum lowpan_lltypes {
	95	LOWPAN_LLTYPE_BTLE,
	96	LOWPAN_LLTYPE_IEEE802154,
	97	};
	98
	99	struct lowpan_priv {
	100	enum lowpan_lltypes lltype;
	101
	102	/* must be last */
	103	u8 priv[0] __aligned(sizeof(void *));
	104	};
	105
	106	static inline
	107	struct lowpan_priv lowpan_priv(const struct net_device dev)
	108	{
	109	return netdev_priv(dev);
	110	}
	111
72a5e6bb AA	112	struct lowpan_802154_cb {
	113	u16 d_tag;
	114	unsigned int d_size;
	115	u8 d_offset;
	116	};
	117
	118	static inline
	119	struct lowpan_802154_cb lowpan_802154_cb(const struct sk_buff skb)
	120	{
	121	BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(skb->cb));
	122	return (struct lowpan_802154_cb *)skb->cb;
	123	}
	124
841a5ec7 AA	125	#ifdef DEBUG
	126	/* print data in line */
	127	static inline void raw_dump_inline(const char caller, char msg,
a6f77389	128	const unsigned char *buf, int len)
841a5ec7 AA	129	{
	130	if (msg)
	131	pr_debug("%s():%s: ", caller, msg);
	132
	133	print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false);
	134	}
	135
	136	/* print data in a table format:
	137	*
	138	* addr: xx xx xx xx xx xx
	139	* addr: xx xx xx xx xx xx
	140	* ...
	141	*/
	142	static inline void raw_dump_table(const char caller, char msg,
a6f77389	143	const unsigned char *buf, int len)
841a5ec7 AA	144	{
	145	if (msg)
	146	pr_debug("%s():%s:\n", caller, msg);
	147
	148	print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false);
	149	}
	150	#else
	151	static inline void raw_dump_table(const char caller, char msg,
a6f77389	152	const unsigned char *buf, int len) { }
841a5ec7	153	static inline void raw_dump_inline(const char caller, char msg,
a6f77389	154	const unsigned char *buf, int len) { }
841a5ec7 AA	155	#endif
841a5ec7 AA	156
478208e3 AA	157	/**
	158	* lowpan_fetch_skb - getting inline data from 6LoWPAN header
	159	*
	160	* This function will pull data from sk buffer and put it into data to
	161	* remove the 6LoWPAN inline data. This function returns true if the
	162	* sk buffer is too small to pull the amount of data which is specified
	163	* by len.
	164	*
	165	* @skb: the buffer where the inline data should be pulled from.
	166	* @data: destination buffer for the inline data.
	167	* @len: amount of data which should be pulled in bytes.
	168	*/
	169	static inline bool lowpan_fetch_skb(struct sk_buff skb, void data,
	170	unsigned int len)
4666669f AA	171	{
	172	if (unlikely(!pskb_may_pull(skb, len)))
	173	return true;
	174
	175	skb_copy_from_linear_data(skb, data, len);
	176	skb_pull(skb, len);
	177
	178	return false;
	179	}
	180
3109f2e2 AA	181	static inline void lowpan_push_hc_data(u8 *hc_ptr, const void data,
	182	const size_t len)
	183	{
	184	memcpy(*hc_ptr, data, len);
	185	*hc_ptr += len;
	186	}
	187
b72f6f51 AA	188	void lowpan_netdev_setup(struct net_device *dev, enum lowpan_lltypes lltype);
b72f6f51 AA	189
8911d774 AA	190	/**
	191	* lowpan_header_decompress - replace 6LoWPAN header with IPv6 header
	192	*
	193	* This function replaces the IPHC 6LoWPAN header which should be pointed at
	194	* skb->data and skb_network_header, with the IPv6 header.
	195	* It would be nice that the caller have the necessary headroom of IPv6 header
	196	* and greatest Transport layer header, this would reduce the overhead for
	197	* reallocate headroom.
	198	*
	199	* @skb: the buffer which should be manipulate.
	200	* @dev: the lowpan net device pointer.
	201	* @daddr: destination lladdr of mac header which is used for compression
	202	* methods.
	203	* @saddr: source lladdr of mac header which is used for compression
	204	* methods.
	205	*/
	206	int lowpan_header_decompress(struct sk_buff skb, const struct net_device dev,
	207	const void daddr, const void saddr);
a6f77389 AA	208
	209	/**
	210	* lowpan_header_compress - replace IPv6 header with 6LoWPAN header
	211	*
	212	* This function replaces the IPv6 header which should be pointed at
	213	* skb->data and skb_network_header, with the IPHC 6LoWPAN header.
	214	* The caller need to be sure that the sk buffer is not shared and at have
	215	* at least a headroom which is smaller or equal LOWPAN_IPHC_MAX_HEADER_LEN,
	216	* which is the IPHC "more bytes than IPv6 header" at worst case.
	217	*
	218	* @skb: the buffer which should be manipulate.
	219	* @dev: the lowpan net device pointer.
	220	* @daddr: destination lladdr of mac header which is used for compression
	221	* methods.
	222	* @saddr: source lladdr of mac header which is used for compression
	223	* methods.
	224	*/
	225	int lowpan_header_compress(struct sk_buff skb, const struct net_device dev,
	226	const void daddr, const void saddr);
8df8c56a	227
44331fe2	228	#endif /* __6LOWPAN_H__ */