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478208e3b9
linux-next/include/net/6lowpan.h
Alexander Aring 478208e3b9 6lowpan: remove lowpan_fetch_skb_u8 
This patch removes the lowpan_fetch_skb_u8 function for getting the iphc
bytes. Instead we using the generic which has a len parameter to tell
the amount of bytes to fetch.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2015-10-21 00:49:25 +02:00

362 lines
12 KiB
C
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/*
* 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 */
#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)
/*
* 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_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_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 */
#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__ */
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