[457] | 1 | /**
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| 2 | * @file
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| 3 | * 6LowPAN over BLE output for IPv6 (RFC7668).
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2017 Benjamin Aigner
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| 8 | * Copyright (c) 2015 Inico Technologies Ltd. , Author: Ivan Delamer <delamer@inicotech.com>
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| 9 | *
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| 10 | * All rights reserved.
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| 11 | *
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| 12 | * Redistribution and use in source and binary forms, with or without modification,
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| 13 | * are permitted provided that the following conditions are met:
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| 14 | *
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| 15 | * 1. Redistributions of source code must retain the above copyright notice,
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| 16 | * this list of conditions and the following disclaimer.
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| 17 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 18 | * this list of conditions and the following disclaimer in the documentation
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| 19 | * and/or other materials provided with the distribution.
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| 20 | * 3. The name of the author may not be used to endorse or promote products
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| 21 | * derived from this software without specific prior written permission.
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| 22 | *
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| 23 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 24 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 25 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 26 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 27 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 28 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 30 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 31 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 32 | * OF SUCH DAMAGE.
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| 33 | *
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| 34 | * Author: Benjamin Aigner <aignerb@technikum-wien.at>
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| 35 | *
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| 36 | * Based on the original 6lowpan implementation of lwIP ( @see 6lowpan.c)
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| 37 | */
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| 38 |
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| 39 |
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| 40 | /**
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| 41 | * @defgroup rfc7668if 6LoWPAN over BLE (RFC7668)
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| 42 | * @ingroup netifs
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| 43 | * This file implements a RFC7668 implementation for 6LoWPAN over
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| 44 | * Bluetooth Low Energy. The specification is very similar to 6LoWPAN,
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| 45 | * so most of the code is re-used.
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| 46 | * Compared to 6LoWPAN, much functionality is already implemented in
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| 47 | * lower BLE layers (fragmenting, session management,...).
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| 48 | *
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| 49 | * Usage:
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| 50 | * - add this netif
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| 51 | * - don't add IPv4 addresses (no IPv4 support in RFC7668), pass 'NULL','NULL','NULL'
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| 52 | * - use the BLE to EUI64 conversation util to create an IPv6 link-local address from the BLE MAC (@ref ble_addr_to_eui64)
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| 53 | * - input function: @ref rfc7668_input
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| 54 | * - set the link output function, which transmits output data to an established L2CAP channel
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| 55 | * - If data arrives (HCI event "L2CAP_DATA_PACKET"):
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| 56 | * - allocate a @ref PBUF_RAW buffer
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| 57 | * - let the pbuf struct point to the incoming data or copy it to the buffer
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| 58 | * - call netif->input
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| 59 | *
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| 60 | * @todo:
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| 61 | * - further testing
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| 62 | * - support compression contexts
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| 63 | * - support multiple addresses
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| 64 | * - support multicast
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| 65 | * - support neighbor discovery
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| 66 | */
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| 67 |
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| 68 |
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| 69 | #include "netif/lowpan6_ble.h"
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| 70 |
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| 71 | #if LWIP_IPV6
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| 72 |
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| 73 | #include "lwip/ip.h"
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| 74 | #include "lwip/pbuf.h"
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| 75 | #include "lwip/ip_addr.h"
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| 76 | #include "lwip/netif.h"
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| 77 | #include "lwip/nd6.h"
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| 78 | #include "lwip/mem.h"
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| 79 | #include "lwip/udp.h"
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| 80 | #include "lwip/tcpip.h"
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| 81 | #include "lwip/snmp.h"
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| 82 |
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| 83 | #include <string.h>
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| 84 |
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| 85 | #if LWIP_6LOWPAN_NUM_CONTEXTS > 0
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| 86 | /** context memory, containing IPv6 addresses */
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| 87 | static ip6_addr_t rfc7668_context[LWIP_6LOWPAN_NUM_CONTEXTS];
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| 88 | #else
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| 89 | #define rfc7668_context NULL
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| 90 | #endif
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| 91 |
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| 92 | static struct lowpan6_link_addr rfc7668_local_addr;
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| 93 | static struct lowpan6_link_addr rfc7668_peer_addr;
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| 94 |
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| 95 | /**
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| 96 | * @ingroup rfc7668if
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| 97 | * convert BT address to EUI64 addr
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| 98 | *
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| 99 | * This method converts a Bluetooth MAC address to an EUI64 address,
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| 100 | * which is used within IPv6 communication
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| 101 | *
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| 102 | * @param dst IPv6 destination space
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| 103 | * @param src BLE MAC address source
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| 104 | * @param public_addr If the LWIP_RFC7668_LINUX_WORKAROUND_PUBLIC_ADDRESS
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| 105 | * option is set, bit 0x02 will be set if param=0 (no public addr); cleared otherwise
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| 106 | *
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| 107 | * @see LWIP_RFC7668_LINUX_WORKAROUND_PUBLIC_ADDRESS
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| 108 | */
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| 109 | void
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| 110 | ble_addr_to_eui64(uint8_t *dst, const uint8_t *src, int public_addr)
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| 111 | {
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| 112 | /* according to RFC7668 ch 3.2.2. */
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| 113 | memcpy(dst, src, 3);
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| 114 | dst[3] = 0xFF;
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| 115 | dst[4] = 0xFE;
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| 116 | memcpy(&dst[5], &src[3], 3);
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| 117 | #if LWIP_RFC7668_LINUX_WORKAROUND_PUBLIC_ADDRESS
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| 118 | if(public_addr) {
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| 119 | dst[0] &= ~0x02;
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| 120 | } else {
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| 121 | dst[0] |= 0x02;
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| 122 | }
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| 123 | #else
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| 124 | LWIP_UNUSED_ARG(public_addr);
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| 125 | #endif
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| 126 | }
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| 127 |
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| 128 | /**
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| 129 | * @ingroup rfc7668if
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| 130 | * convert EUI64 address to Bluetooth MAC addr
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| 131 | *
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| 132 | * This method converts an EUI64 address to a Bluetooth MAC address,
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| 133 | *
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| 134 | * @param dst BLE MAC address destination
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| 135 | * @param src IPv6 source
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| 136 | *
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| 137 | */
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| 138 | void
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| 139 | eui64_to_ble_addr(uint8_t *dst, const uint8_t *src)
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| 140 | {
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| 141 | /* according to RFC7668 ch 3.2.2. */
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| 142 | memcpy(dst,src,3);
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| 143 | memcpy(&dst[3],&src[5],3);
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| 144 | }
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| 145 |
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| 146 | /** Set an address used for stateful compression.
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| 147 | * This expects an address of 6 or 8 bytes.
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| 148 | */
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| 149 | static err_t
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| 150 | rfc7668_set_addr(struct lowpan6_link_addr *addr, const u8_t *in_addr, size_t in_addr_len, int is_mac_48, int is_public_addr)
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| 151 | {
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| 152 | if ((in_addr == NULL) || (addr == NULL)) {
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| 153 | return ERR_VAL;
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| 154 | }
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| 155 | if (is_mac_48) {
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| 156 | if (in_addr_len != 6) {
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| 157 | return ERR_VAL;
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| 158 | }
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| 159 | addr->addr_len = 8;
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| 160 | ble_addr_to_eui64(addr->addr, in_addr, is_public_addr);
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| 161 | } else {
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| 162 | if (in_addr_len != 8) {
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| 163 | return ERR_VAL;
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| 164 | }
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| 165 | addr->addr_len = 8;
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| 166 | memcpy(addr->addr, in_addr, 8);
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| 167 | }
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| 168 | return ERR_OK;
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| 169 | }
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| 170 |
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| 171 |
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| 172 | /** Set the local address used for stateful compression.
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| 173 | * This expects an address of 8 bytes.
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| 174 | */
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| 175 | err_t
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| 176 | rfc7668_set_local_addr_eui64(struct netif *netif, const u8_t *local_addr, size_t local_addr_len)
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| 177 | {
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| 178 | /* netif not used for now, the address is stored globally... */
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| 179 | LWIP_UNUSED_ARG(netif);
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| 180 | return rfc7668_set_addr(&rfc7668_local_addr, local_addr, local_addr_len, 0, 0);
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| 181 | }
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| 182 |
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| 183 | /** Set the local address used for stateful compression.
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| 184 | * This expects an address of 6 bytes.
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| 185 | */
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| 186 | err_t
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| 187 | rfc7668_set_local_addr_mac48(struct netif *netif, const u8_t *local_addr, size_t local_addr_len, int is_public_addr)
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| 188 | {
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| 189 | /* netif not used for now, the address is stored globally... */
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| 190 | LWIP_UNUSED_ARG(netif);
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| 191 | return rfc7668_set_addr(&rfc7668_local_addr, local_addr, local_addr_len, 1, is_public_addr);
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| 192 | }
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| 193 |
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| 194 | /** Set the peer address used for stateful compression.
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| 195 | * This expects an address of 8 bytes.
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| 196 | */
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| 197 | err_t
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| 198 | rfc7668_set_peer_addr_eui64(struct netif *netif, const u8_t *peer_addr, size_t peer_addr_len)
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| 199 | {
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| 200 | /* netif not used for now, the address is stored globally... */
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| 201 | LWIP_UNUSED_ARG(netif);
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| 202 | return rfc7668_set_addr(&rfc7668_peer_addr, peer_addr, peer_addr_len, 0, 0);
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| 203 | }
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| 204 |
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| 205 | /** Set the peer address used for stateful compression.
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| 206 | * This expects an address of 6 bytes.
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| 207 | */
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| 208 | err_t
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| 209 | rfc7668_set_peer_addr_mac48(struct netif *netif, const u8_t *peer_addr, size_t peer_addr_len, int is_public_addr)
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| 210 | {
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| 211 | /* netif not used for now, the address is stored globally... */
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| 212 | LWIP_UNUSED_ARG(netif);
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| 213 | return rfc7668_set_addr(&rfc7668_peer_addr, peer_addr, peer_addr_len, 1, is_public_addr);
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| 214 | }
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| 215 |
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| 216 | /** Encapsulate IPv6 frames for BLE transmission
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| 217 | *
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| 218 | * This method implements the IPv6 header compression:
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| 219 | * *) According to RFC6282
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| 220 | * *) See Figure 2, contains base format of bit positions
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| 221 | * *) Fragmentation not necessary (done at L2CAP layer of BLE)
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| 222 | * @note Currently the pbuf allocation uses 256 bytes. If longer packets are used (possible due to MTU=1480Bytes), increase it here!
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| 223 | *
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| 224 | * @param p Pbuf struct, containing the payload data
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| 225 | * @param netif Output network interface. Should be of RFC7668 type
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| 226 | *
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| 227 | * @return Same as netif->output.
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| 228 | */
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| 229 | static err_t
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| 230 | rfc7668_compress(struct netif *netif, struct pbuf *p)
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| 231 | {
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| 232 | struct pbuf *p_frag;
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| 233 | u16_t remaining_len;
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| 234 | u8_t *buffer;
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| 235 | u8_t lowpan6_header_len;
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| 236 | u8_t hidden_header_len;
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| 237 | err_t err;
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| 238 |
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| 239 | LWIP_ASSERT("lowpan6_frag: netif->linkoutput not set", netif->linkoutput != NULL);
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| 240 |
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| 241 | #if LWIP_6LOWPAN_IPHC
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| 242 |
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| 243 | /* We'll use a dedicated pbuf for building BLE fragments.
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| 244 | * We'll over-allocate it by the bytes saved for header compression.
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| 245 | */
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| 246 | p_frag = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
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| 247 | if (p_frag == NULL) {
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| 248 | MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
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| 249 | return ERR_MEM;
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| 250 | }
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| 251 | LWIP_ASSERT("this needs a pbuf in one piece", p_frag->len == p_frag->tot_len);
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| 252 |
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| 253 | /* Write IP6 header (with IPHC). */
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| 254 | buffer = (u8_t*)p_frag->payload;
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| 255 |
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| 256 | err = lowpan6_compress_headers(netif, (u8_t *)p->payload, p->len, buffer, p_frag->len,
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| 257 | &lowpan6_header_len, &hidden_header_len, rfc7668_context, &rfc7668_local_addr, &rfc7668_peer_addr);
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| 258 | if (err != ERR_OK) {
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| 259 | MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
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| 260 | pbuf_free(p_frag);
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| 261 | return err;
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| 262 | }
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| 263 | pbuf_remove_header(p, hidden_header_len);
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| 264 |
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| 265 | /* Calculate remaining packet length */
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| 266 | remaining_len = p->tot_len;
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| 267 |
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| 268 | /* Copy IPv6 packet */
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| 269 | pbuf_copy_partial(p, buffer + lowpan6_header_len, remaining_len, 0);
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| 270 |
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| 271 | /* Calculate frame length */
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| 272 | p_frag->len = p_frag->tot_len = remaining_len + lowpan6_header_len;
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| 273 |
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| 274 | /* send the packet */
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| 275 | MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
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| 276 | LWIP_DEBUGF(LWIP_LOWPAN6_DEBUG|LWIP_DBG_TRACE, ("rfc7668_output: sending packet %p\n", (void *)p));
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| 277 | err = netif->linkoutput(netif, p_frag);
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| 278 |
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| 279 | pbuf_free(p_frag);
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| 280 |
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| 281 | return err;
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| 282 | #else /* LWIP_6LOWPAN_IPHC */
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| 283 | /* 6LoWPAN over BLE requires IPHC! */
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| 284 | return ERR_IF;
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| 285 | #endif/* LWIP_6LOWPAN_IPHC */
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| 286 | }
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| 287 |
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| 288 | /**
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| 289 | * @ingroup rfc7668if
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| 290 | * Set context id IPv6 address
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| 291 | *
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| 292 | * Store one IPv6 address to a given context id.
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| 293 | *
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| 294 | * @param idx Context id
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| 295 | * @param context IPv6 addr for this context
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| 296 | *
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| 297 | * @return ERR_OK (if everything is fine), ERR_ARG (if the context id is out of range), ERR_VAL (if contexts disabled)
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| 298 | */
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| 299 | err_t
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| 300 | rfc7668_set_context(u8_t idx, const ip6_addr_t *context)
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| 301 | {
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| 302 | #if LWIP_6LOWPAN_NUM_CONTEXTS > 0
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| 303 | /* check if the ID is possible */
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| 304 | if (idx >= LWIP_6LOWPAN_NUM_CONTEXTS) {
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| 305 | return ERR_ARG;
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| 306 | }
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| 307 | /* copy IPv6 address to context storage */
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| 308 | ip6_addr_set(&rfc7668_context[idx], context);
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| 309 | return ERR_OK;
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| 310 | #else
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| 311 | LWIP_UNUSED_ARG(idx);
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| 312 | LWIP_UNUSED_ARG(context);
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| 313 | return ERR_VAL;
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| 314 | #endif
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| 315 | }
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| 316 |
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| 317 | /**
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| 318 | * @ingroup rfc7668if
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| 319 | * Compress outgoing IPv6 packet and pass it on to netif->linkoutput
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| 320 | *
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| 321 | * @param netif The lwIP network interface which the IP packet will be sent on.
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| 322 | * @param q The pbuf(s) containing the IP packet to be sent.
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| 323 | * @param ip6addr The IP address of the packet destination.
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| 324 | *
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| 325 | * @return See rfc7668_compress
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| 326 | */
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| 327 | err_t
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| 328 | rfc7668_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr)
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| 329 | {
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| 330 | /* dst ip6addr is not used here, we only have one peer */
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| 331 | LWIP_UNUSED_ARG(ip6addr);
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| 332 |
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| 333 | return rfc7668_compress(netif, q);
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| 334 | }
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| 335 |
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| 336 | /**
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| 337 | * @ingroup rfc7668if
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| 338 | * Process a received raw payload from an L2CAP channel
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| 339 | *
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| 340 | * @param p the received packet, p->payload pointing to the
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| 341 | * IPv6 header (maybe compressed)
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| 342 | * @param netif the network interface on which the packet was received
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| 343 | *
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| 344 | * @return ERR_OK if everything was fine
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| 345 | */
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| 346 | err_t
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| 347 | rfc7668_input(struct pbuf * p, struct netif *netif)
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| 348 | {
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| 349 | u8_t * puc;
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| 350 |
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| 351 | MIB2_STATS_NETIF_ADD(netif, ifinoctets, p->tot_len);
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| 352 |
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| 353 | /* Load first header byte */
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| 354 | puc = (u8_t*)p->payload;
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| 355 |
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| 356 | /* no IP header compression */
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| 357 | if (*puc == 0x41) {
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| 358 | LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("Completed packet, removing dispatch: 0x%2x \n", *puc));
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| 359 | /* This is a complete IPv6 packet, just skip header byte. */
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| 360 | pbuf_remove_header(p, 1);
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| 361 | /* IPHC header compression */
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| 362 | } else if ((*puc & 0xe0 )== 0x60) {
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| 363 | LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("Completed packet, decompress dispatch: 0x%2x \n", *puc));
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| 364 | /* IPv6 headers are compressed using IPHC. */
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| 365 | p = lowpan6_decompress(p, 0, rfc7668_context, &rfc7668_peer_addr, &rfc7668_local_addr);
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| 366 | /* if no pbuf is returned, handle as discarded packet */
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| 367 | if (p == NULL) {
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| 368 | MIB2_STATS_NETIF_INC(netif, ifindiscards);
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| 369 | return ERR_OK;
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| 370 | }
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| 371 | /* invalid header byte, discard */
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| 372 | } else {
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| 373 | LWIP_DEBUGF(LWIP_LOWPAN6_DECOMPRESSION_DEBUG, ("Completed packet, discarding: 0x%2x \n", *puc));
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| 374 | MIB2_STATS_NETIF_INC(netif, ifindiscards);
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| 375 | pbuf_free(p);
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| 376 | return ERR_OK;
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| 377 | }
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| 378 | /* @todo: distinguish unicast/multicast */
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| 379 | MIB2_STATS_NETIF_INC(netif, ifinucastpkts);
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| 380 |
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| 381 | #if LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG
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| 382 | {
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| 383 | u16_t i;
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| 384 | LWIP_DEBUGF(LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG, ("IPv6 payload:\n"));
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| 385 | for (i = 0; i < p->len; i++) {
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| 386 | if ((i%4)==0) {
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| 387 | LWIP_DEBUGF(LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG, ("\n"));
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| 388 | }
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| 389 | LWIP_DEBUGF(LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG, ("%2X ", *((uint8_t *)p->payload+i)));
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| 390 | }
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| 391 | LWIP_DEBUGF(LWIP_RFC7668_IP_UNCOMPRESSED_DEBUG, ("\np->len: %d\n", p->len));
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| 392 | }
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| 393 | #endif
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| 394 | /* pass data to ip6_input */
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| 395 | return ip6_input(p, netif);
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| 396 | }
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| 397 |
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| 398 | /**
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| 399 | * @ingroup rfc7668if
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| 400 | * Initialize the netif
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| 401 | *
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| 402 | * No flags are used (broadcast not possible, not ethernet, ...)
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| 403 | * The shortname for this netif is "BT"
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| 404 | *
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| 405 | * @param netif the network interface to be initialized as RFC7668 netif
|
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| 406 | *
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| 407 | * @return ERR_OK if everything went fine
|
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| 408 | */
|
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| 409 | err_t
|
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| 410 | rfc7668_if_init(struct netif *netif)
|
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| 411 | {
|
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| 412 | netif->name[0] = 'b';
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| 413 | netif->name[1] = 't';
|
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| 414 | /* local function as IPv6 output */
|
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| 415 | netif->output_ip6 = rfc7668_output;
|
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| 416 |
|
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| 417 | MIB2_INIT_NETIF(netif, snmp_ifType_other, 0);
|
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| 418 |
|
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| 419 | /* maximum transfer unit, set according to RFC7668 ch2.4 */
|
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| 420 | netif->mtu = 1280;
|
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| 421 |
|
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| 422 | /* no flags set (no broadcast, ethernet,...)*/
|
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| 423 | netif->flags = 0;
|
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| 424 |
|
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| 425 | /* everything fine */
|
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| 426 | return ERR_OK;
|
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| 427 | }
|
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| 428 |
|
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| 429 | #if !NO_SYS
|
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| 430 | /**
|
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| 431 | * Pass a received packet to tcpip_thread for input processing
|
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| 432 | *
|
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| 433 | * @param p the received packet, p->payload pointing to the
|
---|
| 434 | * IEEE 802.15.4 header.
|
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| 435 | * @param inp the network interface on which the packet was received
|
---|
| 436 | *
|
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| 437 | * @return see @ref tcpip_inpkt, same return values
|
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| 438 | */
|
---|
| 439 | err_t
|
---|
| 440 | tcpip_rfc7668_input(struct pbuf *p, struct netif *inp)
|
---|
| 441 | {
|
---|
| 442 | /* send data to upper layer, return the result */
|
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| 443 | return tcpip_inpkt(p, inp, rfc7668_input);
|
---|
| 444 | }
|
---|
| 445 | #endif /* !NO_SYS */
|
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| 446 |
|
---|
| 447 | #endif /* LWIP_IPV6 */
|
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