[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 UIP_802154_SHORTADDR_LEN	2  /* compressed ipv6 address length */
#define UIP_IPH_LEN			40 /* ipv6 fixed header size */
#define UIP_PROTO_UDP			17 /* ipv6 next header value for UDP */
#define UIP_FRAGH_LEN			8  /* ipv6 fragment header size */

/*
 * ipv6 address based on mac
 * second bit-flip (Universe/Local) is done according RFC2464
 */
#define is_addr_mac_addr_based(a, m) \
	((((a)->s6_addr[8])  == (((m)[0]) ^ 0x02)) &&	\
	 (((a)->s6_addr[9])  == (m)[1]) &&		\
	 (((a)->s6_addr[10]) == (m)[2]) &&		\
	 (((a)->s6_addr[11]) == (m)[3]) &&		\
	 (((a)->s6_addr[12]) == (m)[4]) &&		\
	 (((a)->s6_addr[13]) == (m)[5]) &&		\
	 (((a)->s6_addr[14]) == (m)[6]) &&		\
	 (((a)->s6_addr[15]) == (m)[7]))

/*
 * check whether we can compress the IID to 16 bits,
 * it's possible for unicast adresses with first 49 bits are zero only.
 */
#define lowpan_is_iid_16_bit_compressable(a)	\
	((((a)->s6_addr16[4]) == 0) &&		\
	 (((a)->s6_addr[10]) == 0) &&		\
	 (((a)->s6_addr[11]) == 0xff) &&	\
	 (((a)->s6_addr[12]) == 0xfe) &&	\
	 (((a)->s6_addr[13]) == 0))

/* check whether the 112-bit gid of the multicast address is mappable to: */

/* 48 bits, FFXX::00XX:XXXX:XXXX */
#define lowpan_is_mcast_addr_compressable48(a)	\
	((((a)->s6_addr16[1]) == 0) &&		\
	 (((a)->s6_addr16[2]) == 0) &&		\
	 (((a)->s6_addr16[3]) == 0) &&		\
	 (((a)->s6_addr16[4]) == 0) &&		\
	 (((a)->s6_addr[10]) == 0))

/* 32 bits, FFXX::00XX:XXXX */
#define lowpan_is_mcast_addr_compressable32(a)	\
	((((a)->s6_addr16[1]) == 0) &&		\
	 (((a)->s6_addr16[2]) == 0) &&		\
	 (((a)->s6_addr16[3]) == 0) &&		\
	 (((a)->s6_addr16[4]) == 0) &&		\
	 (((a)->s6_addr16[5]) == 0) &&		\
	 (((a)->s6_addr[12]) == 0))

/* 8 bits, FF02::00XX */
#define lowpan_is_mcast_addr_compressable8(a)	\
	((((a)->s6_addr[1])  == 2) &&		\
	 (((a)->s6_addr16[1]) == 0) &&		\
	 (((a)->s6_addr16[2]) == 0) &&		\
	 (((a)->s6_addr16[3]) == 0) &&		\
	 (((a)->s6_addr16[4]) == 0) &&		\
	 (((a)->s6_addr16[5]) == 0) &&		\
	 (((a)->s6_addr16[6]) == 0) &&		\
	 (((a)->s6_addr[14]) == 0))

#define lowpan_is_addr_broadcast(a)	\
	((((a)[0]) == 0xFF) &&	\
	 (((a)[1]) == 0xFF) &&	\
	 (((a)[2]) == 0xFF) &&	\
	 (((a)[3]) == 0xFF) &&	\
	 (((a)[4]) == 0xFF) &&	\
	 (((a)[5]) == 0xFF) &&	\
	 (((a)[6]) == 0xFF) &&	\
	 (((a)[7]) == 0xFF))

#define LOWPAN_DISPATCH_IPV6	0x41 /* 01000001 = 65 */
#define LOWPAN_DISPATCH_HC1	0x42 /* 01000010 = 66 */
#define LOWPAN_DISPATCH_IPHC	0x60 /* 011xxxxx = ... */
#define LOWPAN_DISPATCH_FRAG1	0xc0 /* 11000xxx */
#define LOWPAN_DISPATCH_FRAGN	0xe0 /* 11100xxx */

#define LOWPAN_DISPATCH_MASK	0xf8 /* 11111000 */

#define LOWPAN_FRAG_TIMEOUT	(HZ * 60)	/* time-out 60 sec */

#define LOWPAN_FRAG1_HEAD_SIZE	0x4
#define LOWPAN_FRAGN_HEAD_SIZE	0x5

/*
 * Values of fields within the IPHC encoding first byte
 * (C stands for compressed and I for inline)
 */
#define LOWPAN_IPHC_TF		0x18

#define LOWPAN_IPHC_FL_C	0x10
#define LOWPAN_IPHC_TC_C	0x08
#define LOWPAN_IPHC_NH_C	0x04
#define LOWPAN_IPHC_TTL_1	0x01
#define LOWPAN_IPHC_TTL_64	0x02
#define LOWPAN_IPHC_TTL_255	0x03
#define LOWPAN_IPHC_TTL_I	0x00


/* Values of fields within the IPHC encoding second byte */
#define LOWPAN_IPHC_CID		0x80

#define LOWPAN_IPHC_ADDR_00	0x00
#define LOWPAN_IPHC_ADDR_01	0x01
#define LOWPAN_IPHC_ADDR_02	0x02
#define LOWPAN_IPHC_ADDR_03	0x03

#define LOWPAN_IPHC_SAC		0x40
#define LOWPAN_IPHC_SAM		0x30

#define LOWPAN_IPHC_SAM_BIT	4

#define LOWPAN_IPHC_M		0x08
#define LOWPAN_IPHC_DAC		0x04
#define LOWPAN_IPHC_DAM_00	0x00
#define LOWPAN_IPHC_DAM_01	0x01
#define LOWPAN_IPHC_DAM_10	0x02
#define LOWPAN_IPHC_DAM_11	0x03

#define LOWPAN_IPHC_DAM_BIT	0
/*
 * LOWPAN_UDP encoding (works together with IPHC)
 */
#define LOWPAN_NHC_UDP_MASK		0xF8
#define LOWPAN_NHC_UDP_ID		0xF0
#define LOWPAN_NHC_UDP_CHECKSUMC	0x04
#define LOWPAN_NHC_UDP_CHECKSUMI	0x00

#define LOWPAN_NHC_UDP_4BIT_PORT	0xF0B0
#define LOWPAN_NHC_UDP_4BIT_MASK	0xFFF0
#define LOWPAN_NHC_UDP_8BIT_PORT	0xF000
#define LOWPAN_NHC_UDP_8BIT_MASK	0xFF00

/* values for port compression, _with checksum_ ie bit 5 set to 0 */
#define LOWPAN_NHC_UDP_CS_P_00	0xF0 /* all inline */
#define LOWPAN_NHC_UDP_CS_P_01	0xF1 /* source 16bit inline,
					dest = 0xF0 + 8 bit inline */
#define LOWPAN_NHC_UDP_CS_P_10	0xF2 /* source = 0xF0 + 8bit inline,
					dest = 16 bit inline */
#define LOWPAN_NHC_UDP_CS_P_11	0xF3 /* source & dest = 0xF0B + 4bit inline */
#define LOWPAN_NHC_UDP_CS_C	0x04 /* checksum elided */

#ifdef DEBUG
/* print data in line */
static inline void raw_dump_inline(const char *caller, char *msg,
				   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,
				  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,
				  unsigned char *buf, int len) { }
static inline void raw_dump_inline(const char *caller, char *msg,
				   unsigned char *buf, int len) { }
#endif

static inline int lowpan_fetch_skb_u8(struct sk_buff *skb, u8 *val)
{
	if (unlikely(!pskb_may_pull(skb, 1)))
		return -EINVAL;

	*val = skb->data[0];
	skb_pull(skb, 1);

	return 0;
}

static inline bool lowpan_fetch_skb(struct sk_buff *skb,
		void *data, const 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;
}

static inline u8 lowpan_addr_mode_size(const u8 addr_mode)
{
	static const u8 addr_sizes[] = {
		[LOWPAN_IPHC_ADDR_00] = 16,
		[LOWPAN_IPHC_ADDR_01] = 8,
		[LOWPAN_IPHC_ADDR_02] = 2,
		[LOWPAN_IPHC_ADDR_03] = 0,
	};
	return addr_sizes[addr_mode];
}

static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16 *uncomp_header)
{
	u8 ret = 1;

	if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
		*uncomp_header += sizeof(struct udphdr);

		switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) {
		case LOWPAN_NHC_UDP_CS_P_00:
			ret += 4;
			break;
		case LOWPAN_NHC_UDP_CS_P_01:
		case LOWPAN_NHC_UDP_CS_P_10:
			ret += 3;
			break;
		case LOWPAN_NHC_UDP_CS_P_11:
			ret++;
			break;
		default:
			break;
		}

		if (!(h_enc & LOWPAN_NHC_UDP_CS_C))
			ret += 2;
	}

	return ret;
}

/**
 *	lowpan_uncompress_size - returns skb->len size with uncompressed header
 *	@skb: sk_buff with 6lowpan header inside
 *	@datagram_offset: optional to get the datagram_offset value
 *
 *	Returns the skb->len with uncompressed header
 */
static inline u16
lowpan_uncompress_size(const struct sk_buff *skb, u16 *dgram_offset)
{
	u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr);
	u8 iphc0, iphc1, h_enc;

	iphc0 = skb_network_header(skb)[0];
	iphc1 = skb_network_header(skb)[1];

	switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
	case 0:
		ret += 4;
		break;
	case 1:
		ret += 3;
		break;
	case 2:
		ret++;
		break;
	default:
		break;
	}

	if (!(iphc0 & LOWPAN_IPHC_NH_C))
		ret++;

	if (!(iphc0 & 0x03))
		ret++;

	ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >>
				     LOWPAN_IPHC_SAM_BIT);

	if (iphc1 & LOWPAN_IPHC_M) {
		switch ((iphc1 & LOWPAN_IPHC_DAM_11) >>
			LOWPAN_IPHC_DAM_BIT) {
		case LOWPAN_IPHC_DAM_00:
			ret += 16;
			break;
		case LOWPAN_IPHC_DAM_01:
			ret += 6;
			break;
		case LOWPAN_IPHC_DAM_10:
			ret += 4;
			break;
		case LOWPAN_IPHC_DAM_11:
			ret++;
			break;
		default:
			break;
		}
	} else {
		ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >>
					     LOWPAN_IPHC_DAM_BIT);
	}

	if (iphc0 & LOWPAN_IPHC_NH_C) {
		h_enc = skb_network_header(skb)[ret];
		ret += lowpan_next_hdr_size(h_enc, &uncomp_header);
	}

	if (dgram_offset)
		*dgram_offset = uncomp_header;

	return skb->len + uncomp_header - ret;
}

int
lowpan_header_decompress(struct sk_buff *skb, struct net_device *dev,
			 const u8 *saddr, const u8 saddr_type,
			 const u8 saddr_len, const u8 *daddr,
			 const u8 daddr_type, const u8 daddr_len,
			 u8 iphc0, u8 iphc1);
int lowpan_header_compress(struct sk_buff *skb, struct net_device *dev,
			unsigned short type, const void *_daddr,
			const void *_saddr, unsigned int len);

#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
44331fe2 AS	59	#define UIP_802154_SHORTADDR_LEN 2 /* compressed ipv6 address length */
	60	#define UIP_IPH_LEN 40 /* ipv6 fixed header size */
	61	#define UIP_PROTO_UDP 17 /* ipv6 next header value for UDP */
	62	#define UIP_FRAGH_LEN 8 /* ipv6 fragment header size */
	63
	64	/*
	65	* ipv6 address based on mac
	66	* second bit-flip (Universe/Local) is done according RFC2464
	67	*/
	68	#define is_addr_mac_addr_based(a, m) \
	69	((((a)->s6_addr[8]) == (((m)[0]) ^ 0x02)) && \
	70	(((a)->s6_addr[9]) == (m)[1]) && \
	71	(((a)->s6_addr[10]) == (m)[2]) && \
	72	(((a)->s6_addr[11]) == (m)[3]) && \
	73	(((a)->s6_addr[12]) == (m)[4]) && \
	74	(((a)->s6_addr[13]) == (m)[5]) && \
	75	(((a)->s6_addr[14]) == (m)[6]) && \
	76	(((a)->s6_addr[15]) == (m)[7]))
	77
44331fe2 AS	78	/*
	79	* check whether we can compress the IID to 16 bits,
	80	* it's possible for unicast adresses with first 49 bits are zero only.
	81	*/
	82	#define lowpan_is_iid_16_bit_compressable(a) \
	83	((((a)->s6_addr16[4]) == 0) && \
8d879a3f TC	84	(((a)->s6_addr[10]) == 0) && \
	85	(((a)->s6_addr[11]) == 0xff) && \
	86	(((a)->s6_addr[12]) == 0xfe) && \
	87	(((a)->s6_addr[13]) == 0))
44331fe2	88
44331fe2 AS	89	/* check whether the 112-bit gid of the multicast address is mappable to: */
44331fe2 AS	90
44331fe2 AS	91	/* 48 bits, FFXX::00XX:XXXX:XXXX */
	92	#define lowpan_is_mcast_addr_compressable48(a) \
	93	((((a)->s6_addr16[1]) == 0) && \
	94	(((a)->s6_addr16[2]) == 0) && \
	95	(((a)->s6_addr16[3]) == 0) && \
	96	(((a)->s6_addr16[4]) == 0) && \
	97	(((a)->s6_addr[10]) == 0))
	98
	99	/* 32 bits, FFXX::00XX:XXXX */
	100	#define lowpan_is_mcast_addr_compressable32(a) \
	101	((((a)->s6_addr16[1]) == 0) && \
	102	(((a)->s6_addr16[2]) == 0) && \
	103	(((a)->s6_addr16[3]) == 0) && \
	104	(((a)->s6_addr16[4]) == 0) && \
	105	(((a)->s6_addr16[5]) == 0) && \
	106	(((a)->s6_addr[12]) == 0))
	107
	108	/* 8 bits, FF02::00XX */
	109	#define lowpan_is_mcast_addr_compressable8(a) \
	110	((((a)->s6_addr[1]) == 2) && \
	111	(((a)->s6_addr16[1]) == 0) && \
	112	(((a)->s6_addr16[2]) == 0) && \
	113	(((a)->s6_addr16[3]) == 0) && \
	114	(((a)->s6_addr16[4]) == 0) && \
	115	(((a)->s6_addr16[5]) == 0) && \
	116	(((a)->s6_addr16[6]) == 0) && \
	117	(((a)->s6_addr[14]) == 0))
	118
	119	#define lowpan_is_addr_broadcast(a) \
	120	((((a)[0]) == 0xFF) && \
	121	(((a)[1]) == 0xFF) && \
	122	(((a)[2]) == 0xFF) && \
	123	(((a)[3]) == 0xFF) && \
	124	(((a)[4]) == 0xFF) && \
	125	(((a)[5]) == 0xFF) && \
	126	(((a)[6]) == 0xFF) && \
	127	(((a)[7]) == 0xFF))
	128
	129	#define LOWPAN_DISPATCH_IPV6 0x41 /* 01000001 = 65 */
	130	#define LOWPAN_DISPATCH_HC1 0x42 /* 01000010 = 66 */
	131	#define LOWPAN_DISPATCH_IPHC 0x60 /* 011xxxxx = ... */
	132	#define LOWPAN_DISPATCH_FRAG1 0xc0 /* 11000xxx */
	133	#define LOWPAN_DISPATCH_FRAGN 0xe0 /* 11100xxx */
	134
719269af	135	#define LOWPAN_DISPATCH_MASK 0xf8 /* 11111000 */
	136
	137	#define LOWPAN_FRAG_TIMEOUT (HZ * 60) /* time-out 60 sec */
	138
	139	#define LOWPAN_FRAG1_HEAD_SIZE 0x4
	140	#define LOWPAN_FRAGN_HEAD_SIZE 0x5
	141
44331fe2 AS	142	/*
	143	* Values of fields within the IPHC encoding first byte
	144	* (C stands for compressed and I for inline)
	145	*/
	146	#define LOWPAN_IPHC_TF 0x18
	147
	148	#define LOWPAN_IPHC_FL_C 0x10
	149	#define LOWPAN_IPHC_TC_C 0x08
	150	#define LOWPAN_IPHC_NH_C 0x04
	151	#define LOWPAN_IPHC_TTL_1 0x01
	152	#define LOWPAN_IPHC_TTL_64 0x02
	153	#define LOWPAN_IPHC_TTL_255 0x03
	154	#define LOWPAN_IPHC_TTL_I 0x00
	155
	156
	157	/* Values of fields within the IPHC encoding second byte */
	158	#define LOWPAN_IPHC_CID 0x80
	159
ce2463b2 AA	160	#define LOWPAN_IPHC_ADDR_00 0x00
	161	#define LOWPAN_IPHC_ADDR_01 0x01
	162	#define LOWPAN_IPHC_ADDR_02 0x02
	163	#define LOWPAN_IPHC_ADDR_03 0x03
	164
44331fe2	165	#define LOWPAN_IPHC_SAC 0x40
44331fe2 AS	166	#define LOWPAN_IPHC_SAM 0x30
	167
	168	#define LOWPAN_IPHC_SAM_BIT 4
	169
	170	#define LOWPAN_IPHC_M 0x08
	171	#define LOWPAN_IPHC_DAC 0x04
	172	#define LOWPAN_IPHC_DAM_00 0x00
	173	#define LOWPAN_IPHC_DAM_01 0x01
	174	#define LOWPAN_IPHC_DAM_10 0x02
	175	#define LOWPAN_IPHC_DAM_11 0x03
	176
	177	#define LOWPAN_IPHC_DAM_BIT 0
	178	/*
	179	* LOWPAN_UDP encoding (works together with IPHC)
	180	*/
	181	#define LOWPAN_NHC_UDP_MASK 0xF8
	182	#define LOWPAN_NHC_UDP_ID 0xF0
	183	#define LOWPAN_NHC_UDP_CHECKSUMC 0x04
	184	#define LOWPAN_NHC_UDP_CHECKSUMI 0x00
	185
3bd5b958	186	#define LOWPAN_NHC_UDP_4BIT_PORT 0xF0B0
	187	#define LOWPAN_NHC_UDP_4BIT_MASK 0xFFF0
	188	#define LOWPAN_NHC_UDP_8BIT_PORT 0xF000
	189	#define LOWPAN_NHC_UDP_8BIT_MASK 0xFF00
	190
44331fe2 AS	191	/* values for port compression, _with checksum_ ie bit 5 set to 0 */
	192	#define LOWPAN_NHC_UDP_CS_P_00 0xF0 /* all inline */
	193	#define LOWPAN_NHC_UDP_CS_P_01 0xF1 /* source 16bit inline,
	194	dest = 0xF0 + 8 bit inline */
	195	#define LOWPAN_NHC_UDP_CS_P_10 0xF2 /* source = 0xF0 + 8bit inline,
	196	dest = 16 bit inline */
	197	#define LOWPAN_NHC_UDP_CS_P_11 0xF3 /* source & dest = 0xF0B + 4bit inline */
573701ce	198	#define LOWPAN_NHC_UDP_CS_C 0x04 /* checksum elided */
44331fe2	199
841a5ec7 AA	200	#ifdef DEBUG
	201	/* print data in line */
	202	static inline void raw_dump_inline(const char caller, char msg,
	203	unsigned char *buf, int len)
	204	{
	205	if (msg)
	206	pr_debug("%s():%s: ", caller, msg);
	207
	208	print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, buf, len, false);
	209	}
	210
	211	/* print data in a table format:
	212	*
	213	* addr: xx xx xx xx xx xx
	214	* addr: xx xx xx xx xx xx
	215	* ...
	216	*/
	217	static inline void raw_dump_table(const char caller, char msg,
	218	unsigned char *buf, int len)
	219	{
	220	if (msg)
	221	pr_debug("%s():%s:\n", caller, msg);
	222
	223	print_hex_dump_debug("\t", DUMP_PREFIX_OFFSET, 16, 1, buf, len, false);
	224	}
	225	#else
	226	static inline void raw_dump_table(const char caller, char msg,
	227	unsigned char *buf, int len) { }
	228	static inline void raw_dump_inline(const char caller, char msg,
	229	unsigned char *buf, int len) { }
	230	#endif
	231
8df8c56a JR	232	static inline int lowpan_fetch_skb_u8(struct sk_buff skb, u8 val)
	233	{
	234	if (unlikely(!pskb_may_pull(skb, 1)))
	235	return -EINVAL;
	236
	237	*val = skb->data[0];
	238	skb_pull(skb, 1);
	239
	240	return 0;
	241	}
	242
4666669f AA	243	static inline bool lowpan_fetch_skb(struct sk_buff *skb,
	244	void *data, const unsigned int len)
	245	{
	246	if (unlikely(!pskb_may_pull(skb, len)))
	247	return true;
	248
	249	skb_copy_from_linear_data(skb, data, len);
	250	skb_pull(skb, len);
	251
	252	return false;
	253	}
	254
3109f2e2 AA	255	static inline void lowpan_push_hc_data(u8 *hc_ptr, const void data,
	256	const size_t len)
	257	{
	258	memcpy(*hc_ptr, data, len);
	259	*hc_ptr += len;
	260	}
	261
349aa7bc AA	262	static inline u8 lowpan_addr_mode_size(const u8 addr_mode)
	263	{
	264	static const u8 addr_sizes[] = {
	265	[LOWPAN_IPHC_ADDR_00] = 16,
	266	[LOWPAN_IPHC_ADDR_01] = 8,
	267	[LOWPAN_IPHC_ADDR_02] = 2,
	268	[LOWPAN_IPHC_ADDR_03] = 0,
	269	};
	270	return addr_sizes[addr_mode];
	271	}
	272
	273	static inline u8 lowpan_next_hdr_size(const u8 h_enc, u16 *uncomp_header)
	274	{
	275	u8 ret = 1;
	276
	277	if ((h_enc & LOWPAN_NHC_UDP_MASK) == LOWPAN_NHC_UDP_ID) {
	278	*uncomp_header += sizeof(struct udphdr);
	279
	280	switch (h_enc & LOWPAN_NHC_UDP_CS_P_11) {
	281	case LOWPAN_NHC_UDP_CS_P_00:
	282	ret += 4;
	283	break;
	284	case LOWPAN_NHC_UDP_CS_P_01:
	285	case LOWPAN_NHC_UDP_CS_P_10:
	286	ret += 3;
	287	break;
	288	case LOWPAN_NHC_UDP_CS_P_11:
	289	ret++;
	290	break;
	291	default:
	292	break;
	293	}
	294
	295	if (!(h_enc & LOWPAN_NHC_UDP_CS_C))
	296	ret += 2;
	297	}
	298
	299	return ret;
	300	}
	301
	302	/**
	303	* lowpan_uncompress_size - returns skb->len size with uncompressed header
	304	* @skb: sk_buff with 6lowpan header inside
	305	* @datagram_offset: optional to get the datagram_offset value
	306	*
	307	* Returns the skb->len with uncompressed header
	308	*/
	309	static inline u16
	310	lowpan_uncompress_size(const struct sk_buff skb, u16 dgram_offset)
	311	{
	312	u16 ret = 2, uncomp_header = sizeof(struct ipv6hdr);
	313	u8 iphc0, iphc1, h_enc;
	314
	315	iphc0 = skb_network_header(skb)[0];
	316	iphc1 = skb_network_header(skb)[1];
	317
	318	switch ((iphc0 & LOWPAN_IPHC_TF) >> 3) {
	319	case 0:
	320	ret += 4;
	321	break;
	322	case 1:
	323	ret += 3;
	324	break;
	325	case 2:
326	ret++;
327	break;
328	default:
329	break;
330	}
331
332	if (!(iphc0 & LOWPAN_IPHC_NH_C))
333	ret++;
334
335	if (!(iphc0 & 0x03))
336	ret++;
337
338	ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_SAM) >>
339	LOWPAN_IPHC_SAM_BIT);
340
341	if (iphc1 & LOWPAN_IPHC_M) {
342	switch ((iphc1 & LOWPAN_IPHC_DAM_11) >>
343	LOWPAN_IPHC_DAM_BIT) {
344	case LOWPAN_IPHC_DAM_00:
345	ret += 16;
346	break;
347	case LOWPAN_IPHC_DAM_01:
348	ret += 6;
349	break;
350	case LOWPAN_IPHC_DAM_10:
351	ret += 4;
352	break;
353	case LOWPAN_IPHC_DAM_11:
354	ret++;
355	break;
356	default:
357	break;
358	}
359	} else {
360	ret += lowpan_addr_mode_size((iphc1 & LOWPAN_IPHC_DAM_11) >>
361	LOWPAN_IPHC_DAM_BIT);
362	}
363
364	if (iphc0 & LOWPAN_IPHC_NH_C) {
365	h_enc = skb_network_header(skb)[ret];
366	ret += lowpan_next_hdr_size(h_enc, &uncomp_header);
367	}
368
369	if (dgram_offset)
370	*dgram_offset = uncomp_header;
371
372	return skb->len + uncomp_header - ret;
373	}
374
01141234 MT	375	int
	376	lowpan_header_decompress(struct sk_buff skb, struct net_device dev,
	377	const u8 *saddr, const u8 saddr_type,
	378	const u8 saddr_len, const u8 *daddr,
	379	const u8 daddr_type, const u8 daddr_len,
	380	u8 iphc0, u8 iphc1);
8df8c56a JR	381	int lowpan_header_compress(struct sk_buff skb, struct net_device dev,
	382	unsigned short type, const void *_daddr,
	383	const void *_saddr, unsigned int len);
	384
44331fe2	385	#endif /* __6LOWPAN_H__ */