mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
330 lines
10 KiB
330 lines
10 KiB
/* |
|
* Copyright 2011, Siemens AG |
|
* written by Alexander Smirnov <[email protected]> |
|
*/ |
|
|
|
/* |
|
* Based on patches from Jon Smirl <[email protected]> |
|
* Copyright (c) 2011 Jon Smirl <[email protected]> |
|
* |
|
* 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 <linux/debugfs.h> |
|
|
|
#include <net/ipv6.h> |
|
#include <net/net_namespace.h> |
|
|
|
/* special link-layer handling */ |
|
#include <net/mac802154.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) |
|
/* SCI/DCI is 4 bit width, so we have maximum 16 entries */ |
|
#define LOWPAN_IPHC_CTX_TABLE_SIZE (1 << 4) |
|
|
|
#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_dev) + llpriv_size) |
|
|
|
enum lowpan_lltypes { |
|
LOWPAN_LLTYPE_BTLE, |
|
LOWPAN_LLTYPE_IEEE802154, |
|
}; |
|
|
|
enum lowpan_iphc_ctx_flags { |
|
LOWPAN_IPHC_CTX_FLAG_ACTIVE, |
|
LOWPAN_IPHC_CTX_FLAG_COMPRESSION, |
|
}; |
|
|
|
struct lowpan_iphc_ctx { |
|
u8 id; |
|
struct in6_addr pfx; |
|
u8 plen; |
|
unsigned long flags; |
|
}; |
|
|
|
struct lowpan_iphc_ctx_table { |
|
spinlock_t lock; |
|
const struct lowpan_iphc_ctx_ops *ops; |
|
struct lowpan_iphc_ctx table[LOWPAN_IPHC_CTX_TABLE_SIZE]; |
|
}; |
|
|
|
static inline bool lowpan_iphc_ctx_is_active(const struct lowpan_iphc_ctx *ctx) |
|
{ |
|
return test_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags); |
|
} |
|
|
|
static inline bool |
|
lowpan_iphc_ctx_is_compression(const struct lowpan_iphc_ctx *ctx) |
|
{ |
|
return test_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags); |
|
} |
|
|
|
struct lowpan_dev { |
|
enum lowpan_lltypes lltype; |
|
struct dentry *iface_debugfs; |
|
struct lowpan_iphc_ctx_table ctx; |
|
|
|
/* must be last */ |
|
u8 priv[] __aligned(sizeof(void *)); |
|
}; |
|
|
|
struct lowpan_802154_neigh { |
|
__le16 short_addr; |
|
}; |
|
|
|
static inline |
|
struct lowpan_802154_neigh *lowpan_802154_neigh(void *neigh_priv) |
|
{ |
|
return neigh_priv; |
|
} |
|
|
|
static inline |
|
struct lowpan_dev *lowpan_dev(const struct net_device *dev) |
|
{ |
|
return netdev_priv(dev); |
|
} |
|
|
|
/* private device info */ |
|
struct lowpan_802154_dev { |
|
struct net_device *wdev; /* wpan device ptr */ |
|
u16 fragment_tag; |
|
}; |
|
|
|
static inline struct |
|
lowpan_802154_dev *lowpan_802154_dev(const struct net_device *dev) |
|
{ |
|
return (struct lowpan_802154_dev *)lowpan_dev(dev)->priv; |
|
} |
|
|
|
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; |
|
} |
|
|
|
static inline void lowpan_iphc_uncompress_eui64_lladdr(struct in6_addr *ipaddr, |
|
const void *lladdr) |
|
{ |
|
/* fe:80::XXXX:XXXX:XXXX:XXXX |
|
* \_________________/ |
|
* hwaddr |
|
*/ |
|
ipaddr->s6_addr[0] = 0xFE; |
|
ipaddr->s6_addr[1] = 0x80; |
|
memcpy(&ipaddr->s6_addr[8], lladdr, EUI64_ADDR_LEN); |
|
/* second bit-flip (Universe/Local) |
|
* is done according RFC2464 |
|
*/ |
|
ipaddr->s6_addr[8] ^= 0x02; |
|
} |
|
|
|
static inline void lowpan_iphc_uncompress_eui48_lladdr(struct in6_addr *ipaddr, |
|
const void *lladdr) |
|
{ |
|
/* fe:80::XXXX:XXff:feXX:XXXX |
|
* \_________________/ |
|
* hwaddr |
|
*/ |
|
ipaddr->s6_addr[0] = 0xFE; |
|
ipaddr->s6_addr[1] = 0x80; |
|
memcpy(&ipaddr->s6_addr[8], lladdr, 3); |
|
ipaddr->s6_addr[11] = 0xFF; |
|
ipaddr->s6_addr[12] = 0xFE; |
|
memcpy(&ipaddr->s6_addr[13], lladdr + 3, 3); |
|
} |
|
|
|
#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 bool lowpan_802154_is_valid_src_short_addr(__le16 addr) |
|
{ |
|
/* First bit of addr is multicast, reserved or 802.15.4 specific */ |
|
return !(addr & cpu_to_le16(0x8000)); |
|
} |
|
|
|
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; |
|
} |
|
|
|
int lowpan_register_netdevice(struct net_device *dev, |
|
enum lowpan_lltypes lltype); |
|
int lowpan_register_netdev(struct net_device *dev, |
|
enum lowpan_lltypes lltype); |
|
void lowpan_unregister_netdevice(struct net_device *dev); |
|
void lowpan_unregister_netdev(struct net_device *dev); |
|
|
|
/** |
|
* 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__ */
|
|
|