386 lines
11 KiB
C
386 lines
11 KiB
C
/*
|
|
* 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__ */
|