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1197 lines
40 KiB
C
1197 lines
40 KiB
C
/**
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* @file
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*
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* 6LowPAN output for IPv6. Uses ND tables for link-layer addressing. Fragments packets to 6LowPAN units.
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*/
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/*
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* Copyright (c) 2015 Inico Technologies Ltd.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Ivan Delamer <delamer@inicotech.com>
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*
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*
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* Please coordinate changes and requests with Ivan Delamer
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* <delamer@inicotech.com>
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*/
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#include "netif/lowpan6.h"
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#if LWIP_IPV6 && LWIP_6LOWPAN
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#include "lwip/ip.h"
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#include "lwip/pbuf.h"
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#include "lwip/ip_addr.h"
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#include "lwip/netif.h"
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#include "lwip/nd6.h"
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#include "lwip/mem.h"
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#include "lwip/udp.h"
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#include "lwip/tcpip.h"
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#include "lwip/snmp.h"
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#include <string.h>
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struct ieee_802154_addr {
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u8_t addr_len;
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u8_t addr[8];
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};
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/** This is a helper struct.
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*/
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struct lowpan6_reass_helper {
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struct pbuf *pbuf;
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struct lowpan6_reass_helper *next_packet;
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u8_t timer;
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struct ieee_802154_addr sender_addr;
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u16_t datagram_size;
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u16_t datagram_tag;
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};
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static struct lowpan6_reass_helper * reass_list;
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#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
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static ip6_addr_t lowpan6_context[LWIP_6LOWPAN_NUM_CONTEXTS];
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#endif
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static u16_t ieee_802154_pan_id;
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static const struct ieee_802154_addr ieee_802154_broadcast = {2, {0xff, 0xff}};
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#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
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static struct ieee_802154_addr short_mac_addr = {2, {0,0}};
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#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
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static err_t dequeue_datagram(struct lowpan6_reass_helper *lrh);
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/**
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* Periodic timer for 6LowPAN functions:
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*
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* - Remove incomplete/old packets
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*/
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void
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lowpan6_tmr(void)
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{
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struct lowpan6_reass_helper *lrh, *lrh_temp;
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lrh = reass_list;
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while (lrh != NULL) {
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lrh_temp = lrh->next_packet;
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if ((--lrh->timer) == 0) {
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dequeue_datagram(lrh);
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pbuf_free(lrh->pbuf);
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mem_free(lrh);
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}
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lrh = lrh_temp;
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}
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}
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/**
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* Removes a datagram from the reassembly queue.
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**/
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static err_t
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dequeue_datagram(struct lowpan6_reass_helper *lrh)
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{
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struct lowpan6_reass_helper *lrh_temp;
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if (reass_list == lrh) {
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reass_list = reass_list->next_packet;
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} else {
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lrh_temp = reass_list;
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while (lrh_temp != NULL) {
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if (lrh_temp->next_packet == lrh) {
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lrh_temp->next_packet = lrh->next_packet;
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break;
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}
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lrh_temp = lrh_temp->next_packet;
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}
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}
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return ERR_OK;
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}
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static s8_t
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lowpan6_context_lookup(const ip6_addr_t *ip6addr)
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{
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s8_t i;
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for (i = 0; i < LWIP_6LOWPAN_NUM_CONTEXTS; i++) {
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if (ip6_addr_netcmp(&lowpan6_context[i], ip6addr)) {
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return i;
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}
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}
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return -1;
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}
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/* Determine compression mode for unicast address. */
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static s8_t
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lowpan6_get_address_mode(const ip6_addr_t *ip6addr, const struct ieee_802154_addr *mac_addr)
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{
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if (mac_addr->addr_len == 2) {
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if ((ip6addr->addr[2] == (u32_t)PP_HTONL(0x000000ff)) &&
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((ip6addr->addr[3] & PP_HTONL(0xffff0000)) == PP_NTOHL(0xfe000000))) {
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if ((ip6addr->addr[3] & PP_HTONL(0x0000ffff)) == ntohl((mac_addr->addr[0] << 8) | mac_addr->addr[1])) {
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return 3;
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}
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}
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} else if (mac_addr->addr_len == 8) {
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if ((ip6addr->addr[2] == ntohl(((mac_addr->addr[0] ^ 2) << 24) | (mac_addr->addr[1] << 16) | mac_addr->addr[2] << 8 | mac_addr->addr[3])) &&
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(ip6addr->addr[3] == ntohl((mac_addr->addr[4] << 24) | (mac_addr->addr[5] << 16) | mac_addr->addr[6] << 8 | mac_addr->addr[7]))) {
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return 3;
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}
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}
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if ((ip6addr->addr[2] == PP_HTONL(0x000000ffUL)) &&
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((ip6addr->addr[3] & PP_HTONL(0xffff0000)) == PP_NTOHL(0xfe000000UL))) {
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return 2;
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}
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return 1;
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}
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/* Determine compression mode for multicast address. */
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static s8_t
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lowpan6_get_address_mode_mc(const ip6_addr_t *ip6addr)
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{
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if ((ip6addr->addr[0] == PP_HTONL(0xff020000)) &&
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(ip6addr->addr[1] == 0) &&
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(ip6addr->addr[2] == 0) &&
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((ip6addr->addr[3] & PP_HTONL(0xffffff00)) == 0)) {
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return 3;
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} else if (((ip6addr->addr[0] & PP_HTONL(0xff00ffff)) == PP_HTONL(0xff000000)) &&
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(ip6addr->addr[1] == 0)) {
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if ((ip6addr->addr[2] == 0) &&
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((ip6addr->addr[3] & PP_HTONL(0xff000000)) == 0)) {
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return 2;
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} else if ((ip6addr->addr[2] & PP_HTONL(0xffffff00)) == 0) {
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return 1;
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}
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}
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return 0;
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}
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/*
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* Encapsulates data into IEEE 802.15.4 frames.
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* Fragments an IPv6 datagram into 6LowPAN units, which fit into IEEE 802.15.4 frames.
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* If configured, will compress IPv6 and or UDP headers.
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* */
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static err_t
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lowpan6_frag(struct netif *netif, struct pbuf *p, const struct ieee_802154_addr *src, const struct ieee_802154_addr *dst)
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{
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struct pbuf * p_frag;
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u16_t frag_len, remaining_len;
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u8_t * buffer;
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u8_t ieee_header_len;
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u8_t lowpan6_header_len;
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s8_t i;
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static u8_t frame_seq_num;
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static u16_t datagram_tag;
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u16_t datagram_offset;
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err_t err = ERR_IF;
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/* We'll use a dedicated pbuf for building 6LowPAN fragments. */
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p_frag = pbuf_alloc(PBUF_RAW, 127, PBUF_RAM);
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if (p_frag == NULL) {
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MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
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return ERR_MEM;
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}
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/* Write IEEE 802.15.4 header. */
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buffer = (u8_t*)p_frag->payload;
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ieee_header_len = 0;
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if (dst == &ieee_802154_broadcast) {
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buffer[ieee_header_len++] = 0x01; /* data packet, no ack required. */
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} else {
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buffer[ieee_header_len++] = 0x21; /* data packet, ack required. */
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}
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buffer[ieee_header_len] = (0x00 << 4); /* 2003 frame version */
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buffer[ieee_header_len] |= (dst->addr_len == 2) ? (0x02 << 2) : (0x03 << 2); /* destination addressing mode */
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buffer[ieee_header_len] |= (src->addr_len == 2) ? (0x02 << 6) : (0x03 << 6); /* source addressing mode */
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ieee_header_len++;
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buffer[ieee_header_len++] = frame_seq_num++;
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buffer[ieee_header_len++] = ieee_802154_pan_id & 0xff; /* pan id */
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buffer[ieee_header_len++] = (ieee_802154_pan_id >> 8) & 0xff; /* pan id */
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i = dst->addr_len;
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while (i-- > 0) {
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buffer[ieee_header_len++] = dst->addr[i];
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}
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buffer[ieee_header_len++] = ieee_802154_pan_id & 0xff; /* pan id */
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buffer[ieee_header_len++] = (ieee_802154_pan_id >> 8) & 0xff; /* pan id */
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i = src->addr_len;
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while (i-- > 0) {
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buffer[ieee_header_len++] = src->addr[i];
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}
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#if LWIP_6LOWPAN_IPHC
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/* Perform 6LowPAN IPv6 header compression according to RFC 6282 */
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{
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struct ip6_hdr *ip6hdr;
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/* Point to ip6 header and align copies of src/dest addresses. */
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ip6hdr = (struct ip6_hdr *)p->payload;
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ip_addr_copy_from_ip6(ip_data.current_iphdr_dest, ip6hdr->dest);
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ip_addr_copy_from_ip6(ip_data.current_iphdr_src, ip6hdr->src);
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/* Basic length of 6LowPAN header, set dispatch and clear fields. */
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lowpan6_header_len = 2;
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buffer[ieee_header_len] = 0x60;
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buffer[ieee_header_len + 1] = 0;
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/* Determine whether there will be a Context Identifier Extension byte or not.
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* If so, set it already. */
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#if LWIP_6LOWPAN_NUM_CONTEXTS > 0
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buffer[ieee_header_len + 2] = 0;
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i = lowpan6_context_lookup(ip_2_ip6(&ip_data.current_iphdr_src));
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if (i >= 0) {
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/* Stateful source address compression. */
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buffer[ieee_header_len + 1] |= 0x40;
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buffer[ieee_header_len + 2] |= (i & 0x0f) << 4;
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}
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i = lowpan6_context_lookup(ip_2_ip6(&ip_data.current_iphdr_dest));
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if (i >= 0) {
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/* Stateful destination address compression. */
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buffer[ieee_header_len + 1] |= 0x04;
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buffer[ieee_header_len + 2] |= i & 0x0f;
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}
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if (buffer[ieee_header_len + 2] != 0x00) {
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/* Context identifier extension byte is appended. */
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buffer[ieee_header_len + 1] |= 0x80;
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lowpan6_header_len++;
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}
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#endif /* LWIP_6LOWPAN_NUM_CONTEXTS > 0 */
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/* Determine TF field: Traffic Class, Flow Label */
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if (IP6H_FL(ip6hdr) == 0) {
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/* Flow label is elided. */
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buffer[ieee_header_len] |= 0x10;
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if (IP6H_TC(ip6hdr) == 0) {
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/* Traffic class (ECN+DSCP) elided too. */
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buffer[ieee_header_len] |= 0x08;
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} else {
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/* Traffic class (ECN+DSCP) appended. */
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buffer[ieee_header_len + lowpan6_header_len++] = IP6H_TC(ip6hdr);
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}
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} else {
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if (((IP6H_TC(ip6hdr) & 0x3f) == 0)) {
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/* DSCP portion of Traffic Class is elided, ECN and FL are appended (3 bytes) */
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buffer[ieee_header_len] |= 0x08;
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buffer[ieee_header_len + lowpan6_header_len] = IP6H_TC(ip6hdr) & 0xc0;
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buffer[ieee_header_len + lowpan6_header_len++] |= (IP6H_FL(ip6hdr) >> 16) & 0x0f;
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buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff;
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buffer[ieee_header_len + lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff;
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} else {
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/* Traffic class and flow label are appended (4 bytes) */
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buffer[ieee_header_len + lowpan6_header_len++] = IP6H_TC(ip6hdr);
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buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 16) & 0x0f;
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buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff;
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buffer[ieee_header_len + lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff;
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}
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}
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/* Compress NH?
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* Only if UDP for now. TODO support other NH compression. */
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if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) {
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buffer[ieee_header_len] |= 0x04;
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} else {
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/* append nexth. */
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buffer[ieee_header_len + lowpan6_header_len++] = IP6H_NEXTH(ip6hdr);
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}
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/* Compress hop limit? */
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if (IP6H_HOPLIM(ip6hdr) == 255) {
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buffer[ieee_header_len] |= 0x03;
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} else if (IP6H_HOPLIM(ip6hdr) == 64) {
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buffer[ieee_header_len] |= 0x02;
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} else if (IP6H_HOPLIM(ip6hdr) == 1) {
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buffer[ieee_header_len] |= 0x01;
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} else {
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/* append hop limit */
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buffer[ieee_header_len + lowpan6_header_len++] = IP6H_HOPLIM(ip6hdr);
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}
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/* Compress source address */
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if (((buffer[ieee_header_len + 1] & 0x40) != 0) ||
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(ip6_addr_islinklocal(ip_2_ip6(&ip_data.current_iphdr_src)))) {
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/* Context-based or link-local source address compression. */
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i = lowpan6_get_address_mode(ip_2_ip6(&ip_data.current_iphdr_src), src);
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buffer[ieee_header_len + 1] |= (i & 0x03) << 4;
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if (i == 1) {
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 16, 8);
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lowpan6_header_len += 8;
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} else if (i == 2) {
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 22, 2);
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lowpan6_header_len += 2;
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}
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} else if (ip6_addr_isany(ip_2_ip6(&ip_data.current_iphdr_src))) {
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/* Special case: mark SAC and leave SAM=0 */
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buffer[ieee_header_len + 1] |= 0x40;
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} else {
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/* Append full address. */
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 8, 16);
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lowpan6_header_len += 16;
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}
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/* Compress destination address */
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if (ip6_addr_ismulticast(ip_2_ip6(&ip_data.current_iphdr_dest))) {
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/* TODO support stateful multicast address compression */
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buffer[ieee_header_len + 1] |= 0x08;
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i = lowpan6_get_address_mode_mc(ip_2_ip6(&ip_data.current_iphdr_dest));
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buffer[ieee_header_len + 1] |= i & 0x03;
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if (i == 0) {
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 24, 16);
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lowpan6_header_len += 16;
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} else if (i == 1) {
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buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[25];
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 35, 5);
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lowpan6_header_len += 5;
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} else if (i == 2) {
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buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[25];
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 37, 3);
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lowpan6_header_len += 3;
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} else if (i == 3) {
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buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[39];
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}
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} else if (((buffer[ieee_header_len + 1] & 0x04) != 0) ||
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(ip6_addr_islinklocal(ip_2_ip6(&ip_data.current_iphdr_dest)))) {
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/* Context-based or link-local destination address compression. */
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i = lowpan6_get_address_mode(ip_2_ip6(&ip_data.current_iphdr_dest), dst);
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buffer[ieee_header_len + 1] |= i & 0x03;
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if (i == 1) {
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 32, 8);
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lowpan6_header_len += 8;
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} else if (i == 2) {
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 38, 2);
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lowpan6_header_len += 2;
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}
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} else {
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/* Append full address. */
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MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 24, 16);
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lowpan6_header_len += 16;
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}
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/* Move to payload. */
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pbuf_header(p, -IP6_HLEN);
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/* Compress UDP header? */
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if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) {
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/* TODO support optional checksum compression */
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buffer[ieee_header_len + lowpan6_header_len] = 0xf0;
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/* determine port compression mode. */
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if ((((u8_t *)p->payload)[0] == 0xf0) && ((((u8_t *)p->payload)[1] & 0xf0) == 0xb0) &&
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(((u8_t *)p->payload)[2] == 0xf0) && ((((u8_t *)p->payload)[3] & 0xf0) == 0xb0)) {
|
|
/* Compress source and dest ports. */
|
|
buffer[ieee_header_len + lowpan6_header_len++] |= 0x03;
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((((u8_t *)p->payload)[1] & 0x0f) << 4) | (((u8_t *)p->payload)[3] & 0x0f);
|
|
} else if (((u8_t *)p->payload)[0] == 0xf0) {
|
|
/* Compress source port. */
|
|
buffer[ieee_header_len + lowpan6_header_len++] |= 0x02;
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[1];
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[2];
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[3];
|
|
} else if (((u8_t *)p->payload)[2] == 0xf0) {
|
|
/* Compress dest port. */
|
|
buffer[ieee_header_len + lowpan6_header_len++] |= 0x01;
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[0];
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[1];
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[3];
|
|
} else {
|
|
/* append full ports. */
|
|
lowpan6_header_len++;
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[0];
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[1];
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[2];
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[3];
|
|
}
|
|
|
|
/* elide length and copy checksum */
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[6];
|
|
buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[7];
|
|
|
|
pbuf_header(p, -UDP_HLEN);
|
|
}
|
|
}
|
|
|
|
#else /* LWIP_6LOWPAN_HC */
|
|
/* Send uncompressed IPv6 header with appropriate dispatch byte. */
|
|
lowpan6_header_len = 1;
|
|
buffer[ieee_header_len] = 0x41; /* IPv6 dispatch */
|
|
#endif /* LWIP_6LOWPAN_HC */
|
|
|
|
/* Calculate remaining packet length */
|
|
remaining_len = p->tot_len;
|
|
|
|
if (remaining_len > 0x7FF) {
|
|
MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
|
|
/* datagram_size must fit into 11 bit */
|
|
pbuf_free(p_frag);
|
|
return ERR_VAL;
|
|
}
|
|
|
|
/* Fragment, or 1 packet? */
|
|
if (remaining_len > (127 - ieee_header_len - lowpan6_header_len - 3)) { /* 127 - header - 1 byte dispatch - 2 bytes CRC */
|
|
/* We must move the 6LowPAN header to make room for the FRAG header. */
|
|
i = lowpan6_header_len;
|
|
while (i-- != 0) {
|
|
buffer[ieee_header_len + i + 4] = buffer[ieee_header_len + i];
|
|
}
|
|
|
|
/* Now we need to fragment the packet. FRAG1 header first */
|
|
buffer[ieee_header_len] = 0xc0 | (((p->tot_len + lowpan6_header_len) >> 8) & 0x7);
|
|
buffer[ieee_header_len + 1] = (p->tot_len + lowpan6_header_len) & 0xff;
|
|
|
|
datagram_tag++;
|
|
buffer[ieee_header_len + 2] = datagram_tag & 0xff;
|
|
buffer[ieee_header_len + 3] = (datagram_tag >> 8) & 0xff;
|
|
|
|
/* Fragment follows. */
|
|
frag_len = (127 - ieee_header_len - 4 - 2) & 0xf8;
|
|
|
|
pbuf_copy_partial(p, buffer + ieee_header_len + lowpan6_header_len + 4, frag_len - lowpan6_header_len, 0);
|
|
remaining_len -= frag_len - lowpan6_header_len;
|
|
datagram_offset = frag_len;
|
|
|
|
/* 2 bytes CRC */
|
|
#if LWIP_6LOWPAN_HW_CRC
|
|
/* Leave blank, will be filled by HW. */
|
|
#else /* LWIP_6LOWPAN_HW_CRC */
|
|
/* TODO calculate CRC */
|
|
#endif /* LWIP_6LOWPAN_HW_CRC */
|
|
|
|
/* Calculate frame length */
|
|
p_frag->len = p_frag->tot_len = ieee_header_len + 4 + frag_len + 2; /* add 2 dummy bytes for crc*/
|
|
|
|
/* send the packet */
|
|
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
|
LWIP_DEBUGF(LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
|
err = netif->linkoutput(netif, p_frag);
|
|
|
|
while ((remaining_len > 0) && (err == ERR_OK)) {
|
|
/* new frame, new seq num for ACK */
|
|
buffer[2] = frame_seq_num++;
|
|
|
|
buffer[ieee_header_len] |= 0x20; /* Change FRAG1 to FRAGN */
|
|
|
|
buffer[ieee_header_len + 4] = (u8_t)(datagram_offset >> 3); /* datagram offset in FRAGN header (datagram_offset is max. 11 bit) */
|
|
|
|
frag_len = (127 - ieee_header_len - 5 - 2) & 0xf8;
|
|
if (frag_len > remaining_len) {
|
|
frag_len = remaining_len;
|
|
}
|
|
|
|
pbuf_copy_partial(p, buffer + ieee_header_len + 5, frag_len, p->tot_len - remaining_len);
|
|
remaining_len -= frag_len;
|
|
datagram_offset += frag_len;
|
|
|
|
/* 2 bytes CRC */
|
|
#if LWIP_6LOWPAN_HW_CRC
|
|
/* Leave blank, will be filled by HW. */
|
|
#else /* LWIP_6LOWPAN_HW_CRC */
|
|
/* TODO calculate CRC */
|
|
#endif /* LWIP_6LOWPAN_HW_CRC */
|
|
|
|
/* Calculate frame length */
|
|
p_frag->len = p_frag->tot_len = frag_len + 5 + ieee_header_len + 2;
|
|
|
|
/* send the packet */
|
|
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
|
LWIP_DEBUGF(LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
|
err = netif->linkoutput(netif, p_frag);
|
|
}
|
|
} else {
|
|
/* It fits in one frame. */
|
|
frag_len = remaining_len;
|
|
|
|
/* Copy IPv6 packet */
|
|
pbuf_copy_partial(p, buffer + ieee_header_len + lowpan6_header_len, frag_len, 0);
|
|
remaining_len = 0;
|
|
|
|
/* 2 bytes CRC */
|
|
#if LWIP_6LOWPAN_HW_CRC
|
|
/* Leave blank, will be filled by HW. */
|
|
#else /* LWIP_6LOWPAN_HW_CRC */
|
|
/* TODO calculate CRC */
|
|
#endif /* LWIP_6LOWPAN_HW_CRC */
|
|
|
|
/* Calculate frame length */
|
|
p_frag->len = p_frag->tot_len = frag_len + lowpan6_header_len + ieee_header_len + 2;
|
|
|
|
/* send the packet */
|
|
MIB2_STATS_NETIF_ADD(netif, ifoutoctets, p_frag->tot_len);
|
|
LWIP_DEBUGF(LOWPAN6_DEBUG | LWIP_DBG_TRACE, ("lowpan6_send: sending packet %p\n", (void *)p));
|
|
err = netif->linkoutput(netif, p_frag);
|
|
}
|
|
|
|
pbuf_free(p_frag);
|
|
|
|
return err;
|
|
}
|
|
|
|
err_t
|
|
lowpan6_set_context(u8_t idx, const ip6_addr_t * context)
|
|
{
|
|
if (idx >= LWIP_6LOWPAN_NUM_CONTEXTS) {
|
|
return ERR_ARG;
|
|
}
|
|
|
|
ip6_addr_set(&lowpan6_context[idx], context);
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
|
err_t
|
|
lowpan6_set_short_addr(u8_t addr_high, u8_t addr_low)
|
|
{
|
|
short_mac_addr.addr[0] = addr_high;
|
|
short_mac_addr.addr[1] = addr_low;
|
|
|
|
return ERR_OK;
|
|
}
|
|
#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
|
|
|
|
#if LWIP_IPV4
|
|
err_t
|
|
lowpan4_output(struct netif *netif, struct pbuf *q, const ip4_addr_t *ipaddr)
|
|
{
|
|
(void)netif;
|
|
(void)q;
|
|
(void)ipaddr;
|
|
|
|
return ERR_IF;
|
|
}
|
|
#endif /* LWIP_IPV4 */
|
|
|
|
/**
|
|
* Resolve and fill-in IEEE 802.15.4 address header for outgoing IPv6 packet.
|
|
*
|
|
* Perform Header Compression and fragment if necessary.
|
|
*
|
|
* @param netif The lwIP network interface which the IP packet will be sent on.
|
|
* @param q The pbuf(s) containing the IP packet to be sent.
|
|
* @param ip6addr The IP address of the packet destination.
|
|
*
|
|
* @return
|
|
*/
|
|
err_t
|
|
lowpan6_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr)
|
|
{
|
|
s8_t i;
|
|
struct ieee_802154_addr src, dest;
|
|
#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
|
ip6_addr_t ip6_src;
|
|
struct ip6_hdr * ip6_hdr;
|
|
#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
|
|
|
|
#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
|
/* Check if we can compress source address (use aligned copy) */
|
|
ip6_hdr = (struct ip6_hdr *)q->payload;
|
|
ip6_addr_set(&ip6_src, &ip6_hdr->src);
|
|
if (lowpan6_get_address_mode(&ip6_src, &short_mac_addr) == 3) {
|
|
src.addr_len = 2;
|
|
src.addr[0] = short_mac_addr.addr[0];
|
|
src.addr[1] = short_mac_addr.addr[1];
|
|
} else
|
|
#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
|
|
{
|
|
src.addr_len = netif->hwaddr_len;
|
|
SMEMCPY(src.addr, netif->hwaddr, netif->hwaddr_len);
|
|
}
|
|
|
|
/* multicast destination IP address? */
|
|
if (ip6_addr_ismulticast(ip6addr)) {
|
|
MIB2_STATS_NETIF_INC(netif, ifoutnucastpkts);
|
|
/* We need to send to the broadcast address.*/
|
|
return lowpan6_frag(netif, q, &src, &ieee_802154_broadcast);
|
|
}
|
|
|
|
/* We have a unicast destination IP address */
|
|
/* TODO anycast? */
|
|
|
|
#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS
|
|
if (src.addr_len == 2) {
|
|
/* If source address was compressable to short_mac_addr, and dest has same subnet and
|
|
* is also compressable to 2-bytes, assume we can infer dest as a short address too. */
|
|
dest.addr_len = 2;
|
|
dest.addr[0] = ((u8_t *)q->payload)[38];
|
|
dest.addr[1] = ((u8_t *)q->payload)[39];
|
|
if ((src.addr_len == 2) && (ip6_addr_netcmp(&ip6_hdr->src, &ip6_hdr->dest)) &&
|
|
(lowpan6_get_address_mode(ip6addr, &dest) == 3)) {
|
|
MIB2_STATS_NETIF_INC(netif, ifoutucastpkts);
|
|
return lowpan6_frag(netif, q, &src, &dest);
|
|
}
|
|
}
|
|
#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */
|
|
|
|
|
|
/* Get next hop record. */
|
|
i = nd6_get_next_hop_entry(ip6addr, netif);
|
|
if (i < 0) {
|
|
MIB2_STATS_NETIF_INC(netif, ifoutdiscards);
|
|
/* failed to get a next hop neighbor record. */
|
|
return ERR_MEM;
|
|
}
|
|
|
|
/* Now that we have a destination record, send or queue the packet. */
|
|
if (neighbor_cache[i].state == ND6_STALE) {
|
|
/* Switch to delay state. */
|
|
neighbor_cache[i].state = ND6_DELAY;
|
|
neighbor_cache[i].counter.delay_time = LWIP_ND6_DELAY_FIRST_PROBE_TIME;
|
|
}
|
|
/* TODO should we send or queue if PROBE? send for now, to let unicast NS pass. */
|
|
if ((neighbor_cache[i].state == ND6_REACHABLE) ||
|
|
(neighbor_cache[i].state == ND6_DELAY) ||
|
|
(neighbor_cache[i].state == ND6_PROBE)) {
|
|
|
|
/* Send out. */
|
|
dest.addr_len = netif->hwaddr_len;
|
|
SMEMCPY(dest.addr, neighbor_cache[i].lladdr, netif->hwaddr_len);
|
|
MIB2_STATS_NETIF_INC(netif, ifoutucastpkts);
|
|
return lowpan6_frag(netif, q, &src, &dest);
|
|
}
|
|
|
|
/* We should queue packet on this interface. */
|
|
return nd6_queue_packet(i, q);
|
|
}
|
|
|
|
static struct pbuf *
|
|
lowpan6_decompress(struct pbuf * p, struct ieee_802154_addr * src, struct ieee_802154_addr * dest)
|
|
{
|
|
struct pbuf * q;
|
|
u8_t * lowpan6_buffer;
|
|
s8_t lowpan6_offset;
|
|
struct ip6_hdr *ip6hdr;
|
|
s8_t i;
|
|
s8_t ip6_offset = IP6_HLEN;
|
|
|
|
|
|
q = pbuf_alloc(PBUF_IP, p->len + IP6_HLEN + UDP_HLEN, PBUF_POOL);
|
|
if (q == NULL) {
|
|
pbuf_free(p);
|
|
return NULL;
|
|
}
|
|
|
|
lowpan6_buffer = (u8_t *)p->payload;
|
|
ip6hdr = (struct ip6_hdr *)q->payload;
|
|
|
|
lowpan6_offset = 2;
|
|
if (lowpan6_buffer[1] & 0x80) {
|
|
lowpan6_offset++;
|
|
}
|
|
|
|
/* Set IPv6 version, traffic class and flow label. */
|
|
if ((lowpan6_buffer[0] & 0x18) == 0x00) {
|
|
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset], ((lowpan6_buffer[lowpan6_offset+1] & 0x0f) << 16) | (lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset+3]);
|
|
lowpan6_offset += 4;
|
|
} else if ((lowpan6_buffer[0] & 0x18) == 0x08) {
|
|
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset] & 0xc0, ((lowpan6_buffer[lowpan6_offset] & 0x0f) << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset+2]);
|
|
lowpan6_offset += 3;
|
|
} else if ((lowpan6_buffer[0] & 0x18) == 0x10) {
|
|
IP6H_VTCFL_SET(ip6hdr, 6, lowpan6_buffer[lowpan6_offset],0);
|
|
lowpan6_offset += 1;
|
|
} else if ((lowpan6_buffer[0] & 0x18) == 0x18) {
|
|
IP6H_VTCFL_SET(ip6hdr, 6, 0, 0);
|
|
}
|
|
|
|
/* Set Next Header */
|
|
if ((lowpan6_buffer[0] & 0x04) == 0x00) {
|
|
IP6H_NEXTH_SET(ip6hdr, lowpan6_buffer[lowpan6_offset++]);
|
|
} else {
|
|
/* We should fill this later with NHC decoding */
|
|
IP6H_NEXTH_SET(ip6hdr, 0);
|
|
}
|
|
|
|
/* Set Hop Limit */
|
|
if ((lowpan6_buffer[0] & 0x03) == 0x00) {
|
|
IP6H_HOPLIM_SET(ip6hdr, lowpan6_buffer[lowpan6_offset++]);
|
|
} else if ((lowpan6_buffer[0] & 0x03) == 0x01) {
|
|
IP6H_HOPLIM_SET(ip6hdr, 1);
|
|
} else if ((lowpan6_buffer[0] & 0x03) == 0x02) {
|
|
IP6H_HOPLIM_SET(ip6hdr, 64);
|
|
} else if ((lowpan6_buffer[0] & 0x03) == 0x03) {
|
|
IP6H_HOPLIM_SET(ip6hdr, 255);
|
|
}
|
|
|
|
/* Source address decoding. */
|
|
if ((lowpan6_buffer[1] & 0x40) == 0x00) {
|
|
/* Stateless compression */
|
|
if ((lowpan6_buffer[1] & 0x30) == 0x00) {
|
|
/* copy full address */
|
|
MEMCPY(&ip6hdr->src.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
|
lowpan6_offset += 16;
|
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x10) {
|
|
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
|
ip6hdr->src.addr[1] = 0;
|
|
MEMCPY(&ip6hdr->src.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
|
lowpan6_offset += 8;
|
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x20) {
|
|
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
|
ip6hdr->src.addr[1] = 0;
|
|
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
|
ip6hdr->src.addr[3] = htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) |
|
|
lowpan6_buffer[lowpan6_offset+1]);
|
|
lowpan6_offset += 2;
|
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x30) {
|
|
ip6hdr->src.addr[0] = PP_HTONL(0xfe800000UL);
|
|
ip6hdr->src.addr[1] = 0;
|
|
if (src->addr_len == 2) {
|
|
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
|
ip6hdr->src.addr[3] = htonl(0xfe000000UL | (src->addr[0] << 8) | src->addr[1]);
|
|
} else {
|
|
ip6hdr->src.addr[2] = htonl(((src->addr[0] ^ 2) << 24) | (src->addr[1] << 16) |
|
|
(src->addr[2] << 8) | src->addr[3]);
|
|
ip6hdr->src.addr[3] = htonl((src->addr[4] << 24) | (src->addr[5] << 16) |
|
|
(src->addr[6] << 8) | src->addr[7]);
|
|
}
|
|
}
|
|
} else {
|
|
/* Stateful compression */
|
|
if ((lowpan6_buffer[1] & 0x30) == 0x00) {
|
|
/* ANY address */
|
|
ip6hdr->src.addr[0] = 0;
|
|
ip6hdr->src.addr[1] = 0;
|
|
ip6hdr->src.addr[2] = 0;
|
|
ip6hdr->src.addr[3] = 0;
|
|
} else {
|
|
/* Set prefix from context info */
|
|
if (lowpan6_buffer[1] & 0x80) {
|
|
i = (lowpan6_buffer[2] >> 4) & 0x0f;
|
|
} else {
|
|
i = 0;
|
|
}
|
|
if (i >= LWIP_6LOWPAN_NUM_CONTEXTS) {
|
|
/* Error */
|
|
pbuf_free(p);
|
|
pbuf_free(q);
|
|
return NULL;
|
|
}
|
|
|
|
ip6hdr->src.addr[0] = lowpan6_context[i].addr[0];
|
|
ip6hdr->src.addr[1] = lowpan6_context[i].addr[1];
|
|
}
|
|
|
|
if ((lowpan6_buffer[1] & 0x30) == 0x10) {
|
|
MEMCPY(&ip6hdr->src.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
|
lowpan6_offset += 8;
|
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x20) {
|
|
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
|
ip6hdr->src.addr[3] = htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) | lowpan6_buffer[lowpan6_offset+1]);
|
|
lowpan6_offset += 2;
|
|
} else if ((lowpan6_buffer[1] & 0x30) == 0x30) {
|
|
if (src->addr_len == 2) {
|
|
ip6hdr->src.addr[2] = PP_HTONL(0x000000ffUL);
|
|
ip6hdr->src.addr[3] = htonl(0xfe000000UL | (src->addr[0] << 8) | src->addr[1]);
|
|
} else {
|
|
ip6hdr->src.addr[2] = htonl(((src->addr[0] ^ 2) << 24) | (src->addr[1] << 16) | (src->addr[2] << 8) | src->addr[3]);
|
|
ip6hdr->src.addr[3] = htonl((src->addr[4] << 24) | (src->addr[5] << 16) | (src->addr[6] << 8) | src->addr[7]);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Destination address decoding. */
|
|
if (lowpan6_buffer[1] & 0x08) {
|
|
/* Multicast destination */
|
|
if (lowpan6_buffer[1] & 0x04) {
|
|
/* TODO support stateful multicast addressing */
|
|
pbuf_free(p);
|
|
pbuf_free(q);
|
|
return NULL;
|
|
}
|
|
|
|
if ((lowpan6_buffer[1] & 0x03) == 0x00) {
|
|
/* copy full address */
|
|
MEMCPY(&ip6hdr->dest.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
|
lowpan6_offset += 16;
|
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x01) {
|
|
ip6hdr->dest.addr[0] = htonl(0xff000000UL | (lowpan6_buffer[lowpan6_offset++] << 16));
|
|
ip6hdr->dest.addr[1] = 0;
|
|
ip6hdr->dest.addr[2] = htonl(lowpan6_buffer[lowpan6_offset++]);
|
|
ip6hdr->dest.addr[3] = htonl((lowpan6_buffer[lowpan6_offset] << 24) | (lowpan6_buffer[lowpan6_offset + 1] << 16) | (lowpan6_buffer[lowpan6_offset + 2] << 8) | lowpan6_buffer[lowpan6_offset + 3]);
|
|
lowpan6_offset += 4;
|
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x02) {
|
|
ip6hdr->dest.addr[0] = htonl(0xff000000UL | lowpan6_buffer[lowpan6_offset++]);
|
|
ip6hdr->dest.addr[1] = 0;
|
|
ip6hdr->dest.addr[2] = 0;
|
|
ip6hdr->dest.addr[3] = htonl((lowpan6_buffer[lowpan6_offset] << 16) | (lowpan6_buffer[lowpan6_offset + 1] << 8) | lowpan6_buffer[lowpan6_offset + 2]);
|
|
lowpan6_offset += 3;
|
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x03) {
|
|
ip6hdr->dest.addr[0] = PP_HTONL(0xff020000UL);
|
|
ip6hdr->dest.addr[1] = 0;
|
|
ip6hdr->dest.addr[2] = 0;
|
|
ip6hdr->dest.addr[3] = htonl(lowpan6_buffer[lowpan6_offset++]);
|
|
}
|
|
|
|
} else {
|
|
if (lowpan6_buffer[1] & 0x04) {
|
|
/* Stateful destination compression */
|
|
/* Set prefix from context info */
|
|
if (lowpan6_buffer[1] & 0x80) {
|
|
i = lowpan6_buffer[2] & 0x0f;
|
|
} else {
|
|
i = 0;
|
|
}
|
|
if (i >= LWIP_6LOWPAN_NUM_CONTEXTS) {
|
|
/* Error */
|
|
pbuf_free(p);
|
|
pbuf_free(q);
|
|
return NULL;
|
|
}
|
|
|
|
ip6hdr->dest.addr[0] = lowpan6_context[i].addr[0];
|
|
ip6hdr->dest.addr[1] = lowpan6_context[i].addr[1];
|
|
} else {
|
|
/* Link local address compression */
|
|
ip6hdr->dest.addr[0] = PP_HTONL(0xfe800000UL);
|
|
ip6hdr->dest.addr[1] = 0;
|
|
}
|
|
|
|
if ((lowpan6_buffer[1] & 0x03) == 0x00) {
|
|
/* copy full address */
|
|
MEMCPY(&ip6hdr->dest.addr[0], lowpan6_buffer + lowpan6_offset, 16);
|
|
lowpan6_offset += 16;
|
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x01) {
|
|
MEMCPY(&ip6hdr->dest.addr[2], lowpan6_buffer + lowpan6_offset, 8);
|
|
lowpan6_offset += 8;
|
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x02) {
|
|
ip6hdr->dest.addr[2] = PP_HTONL(0x000000ffUL);
|
|
ip6hdr->dest.addr[3] = htonl(0xfe000000UL | (lowpan6_buffer[lowpan6_offset] << 8) | lowpan6_buffer[lowpan6_offset + 1]);
|
|
lowpan6_offset += 2;
|
|
} else if ((lowpan6_buffer[1] & 0x03) == 0x03) {
|
|
if (dest->addr_len == 2) {
|
|
ip6hdr->dest.addr[2] = PP_HTONL(0x000000ffUL);
|
|
ip6hdr->dest.addr[3] = htonl(0xfe000000UL | (dest->addr[0] << 8) | dest->addr[1]);
|
|
} else {
|
|
ip6hdr->dest.addr[2] = htonl(((dest->addr[0] ^ 2) << 24) | (dest->addr[1] << 16) | dest->addr[2] << 8 | dest->addr[3]);
|
|
ip6hdr->dest.addr[3] = htonl((dest->addr[4] << 24) | (dest->addr[5] << 16) | dest->addr[6] << 8 | dest->addr[7]);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* Next Header Compression (NHC) decoding? */
|
|
if (lowpan6_buffer[0] & 0x04) {
|
|
if ((lowpan6_buffer[lowpan6_offset] & 0xf8) == 0xf0) {
|
|
struct udp_hdr *udphdr;
|
|
|
|
/* UDP compression */
|
|
IP6H_NEXTH_SET(ip6hdr, IP6_NEXTH_UDP);
|
|
udphdr = (struct udp_hdr *)((u8_t *)q->payload + ip6_offset);
|
|
|
|
if (lowpan6_buffer[lowpan6_offset] & 0x04) {
|
|
/* TODO support checksum decompress */
|
|
pbuf_free(p);
|
|
pbuf_free(q);
|
|
return NULL;
|
|
}
|
|
|
|
/* Decompress ports */
|
|
i = lowpan6_buffer[lowpan6_offset++] & 0x03;
|
|
if (i == 0) {
|
|
udphdr->src = htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
|
udphdr->dest = htons(lowpan6_buffer[lowpan6_offset + 2] << 8 | lowpan6_buffer[lowpan6_offset + 3]);
|
|
lowpan6_offset += 4;
|
|
} else if (i == 0x01) {
|
|
udphdr->src = htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
|
udphdr->dest = htons(0xf000 | lowpan6_buffer[lowpan6_offset + 2]);
|
|
lowpan6_offset += 3;
|
|
} else if (i == 0x02) {
|
|
udphdr->src = htons(0xf000 | lowpan6_buffer[lowpan6_offset]);
|
|
udphdr->dest = htons(lowpan6_buffer[lowpan6_offset + 1] << 8 | lowpan6_buffer[lowpan6_offset + 2]);
|
|
lowpan6_offset += 3;
|
|
} else if (i == 0x03) {
|
|
udphdr->src = htons(0xf0b0 | ((lowpan6_buffer[lowpan6_offset] >> 4) & 0x0f));
|
|
udphdr->dest = htons(0xf0b0 | (lowpan6_buffer[lowpan6_offset] & 0x0f));
|
|
lowpan6_offset += 1;
|
|
}
|
|
|
|
udphdr->chksum = htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]);
|
|
lowpan6_offset += 2;
|
|
udphdr->len = htons(p->tot_len - lowpan6_offset + UDP_HLEN);
|
|
|
|
ip6_offset += UDP_HLEN;
|
|
} else {
|
|
/* TODO support NHC other than UDP */
|
|
pbuf_free(p);
|
|
pbuf_free(q);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* Now we copy leftover contents from p to q, so we have all L2 and L3 headers (and L4?) in a single PBUF.
|
|
* Replace p with q, and free p */
|
|
pbuf_header(p, -lowpan6_offset);
|
|
MEMCPY((u8_t*)q->payload + ip6_offset, p->payload, p->len);
|
|
q->len = q->tot_len = ip6_offset + p->len;
|
|
if (p->next != NULL) {
|
|
pbuf_cat(q, p->next);
|
|
}
|
|
p->next = NULL;
|
|
pbuf_free(p);
|
|
|
|
/* Infer IPv6 payload length for header */
|
|
IP6H_PLEN_SET(ip6hdr, q->tot_len - IP6_HLEN);
|
|
|
|
/* all done */
|
|
return q;
|
|
}
|
|
|
|
err_t
|
|
lowpan6_input(struct pbuf * p, struct netif *netif)
|
|
{
|
|
u8_t * puc;
|
|
s8_t i;
|
|
struct ieee_802154_addr src, dest;
|
|
u16_t datagram_size, datagram_offset, datagram_tag;
|
|
struct lowpan6_reass_helper *lrh, *lrh_temp;
|
|
|
|
MIB2_STATS_NETIF_ADD(netif, ifinoctets, p->tot_len);
|
|
|
|
/* Analyze header. TODO validate. */
|
|
puc = (u8_t*)p->payload;
|
|
datagram_offset = 5;
|
|
if ((puc[1] & 0x0c) == 0x0c) {
|
|
dest.addr_len = 8;
|
|
for (i = 0; i < 8; i++) {
|
|
dest.addr[i] = puc[datagram_offset + 7 - i];
|
|
}
|
|
datagram_offset += 8;
|
|
} else {
|
|
dest.addr_len = 2;
|
|
dest.addr[0] = puc[datagram_offset + 1];
|
|
dest.addr[1] = puc[datagram_offset];
|
|
datagram_offset += 2;
|
|
}
|
|
|
|
datagram_offset += 2; /* skip PAN ID. */
|
|
|
|
if ((puc[1] & 0xc0) == 0xc0) {
|
|
src.addr_len = 8;
|
|
for (i = 0; i < 8; i++) {
|
|
src.addr[i] = puc[datagram_offset + 7 - i];
|
|
}
|
|
datagram_offset += 8;
|
|
} else {
|
|
src.addr_len = 2;
|
|
src.addr[0] = puc[datagram_offset + 1];
|
|
src.addr[1] = puc[datagram_offset];
|
|
datagram_offset += 2;
|
|
}
|
|
|
|
pbuf_header(p, -datagram_offset); /* hide IEEE802.15.4 header. */
|
|
|
|
/* Check dispatch. */
|
|
puc = (u8_t*)p->payload;
|
|
|
|
if ((*puc & 0xf8) == 0xc0) {
|
|
/* FRAG1 dispatch. add this packet to reassembly list. */
|
|
datagram_size = ((u16_t)(puc[0] & 0x07) << 8) | (u16_t)puc[1];
|
|
datagram_tag = ((u16_t)puc[2] << 8) | (u16_t)puc[3];
|
|
|
|
/* check for duplicate */
|
|
lrh = reass_list;
|
|
while (lrh != NULL) {
|
|
if ((lrh->sender_addr.addr_len == src.addr_len) &&
|
|
(memcmp(lrh->sender_addr.addr, src.addr, src.addr_len) == 0)) {
|
|
/* address match with packet in reassembly. */
|
|
if ((datagram_tag == lrh->datagram_tag) && (datagram_size == lrh->datagram_size)) {
|
|
MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
|
/* duplicate fragment. */
|
|
pbuf_free(p);
|
|
return ERR_OK;
|
|
} else {
|
|
/* We are receiving the start of a new datagram. Discard old one (incomplete). */
|
|
lrh_temp = lrh->next_packet;
|
|
dequeue_datagram(lrh);
|
|
pbuf_free(lrh->pbuf);
|
|
mem_free(lrh);
|
|
|
|
/* Check next datagram in queue. */
|
|
lrh = lrh_temp;
|
|
}
|
|
} else {
|
|
/* Check next datagram in queue. */
|
|
lrh = lrh->next_packet;
|
|
}
|
|
}
|
|
|
|
pbuf_header(p, -4); /* hide frag1 dispatch */
|
|
|
|
lrh = (struct lowpan6_reass_helper *) mem_malloc(sizeof(struct lowpan6_reass_helper));
|
|
if (lrh == NULL) {
|
|
MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
|
pbuf_free(p);
|
|
return ERR_MEM;
|
|
}
|
|
|
|
lrh->sender_addr.addr_len = src.addr_len;
|
|
for (i = 0; i < src.addr_len; i++) {
|
|
lrh->sender_addr.addr[i] = src.addr[i];
|
|
}
|
|
lrh->datagram_size = datagram_size;
|
|
lrh->datagram_tag = datagram_tag;
|
|
lrh->pbuf = p;
|
|
lrh->next_packet = reass_list;
|
|
lrh->timer = 2;
|
|
reass_list = lrh;
|
|
|
|
return ERR_OK;
|
|
} else if ((*puc & 0xf8) == 0xe0) {
|
|
/* FRAGN dispatch, find packet being reassembled. */
|
|
datagram_size = ((u16_t)(puc[0] & 0x07) << 8) | (u16_t)puc[1];
|
|
datagram_tag = ((u16_t)puc[2] << 8) | (u16_t)puc[3];
|
|
datagram_offset = (u16_t)puc[4] << 3;
|
|
pbuf_header(p, -5); /* hide frag1 dispatch */
|
|
|
|
for (lrh = reass_list; lrh != NULL; lrh = lrh->next_packet) {
|
|
if ((lrh->sender_addr.addr_len == src.addr_len) &&
|
|
(memcmp(lrh->sender_addr.addr, src.addr, src.addr_len) == 0) &&
|
|
(datagram_tag == lrh->datagram_tag) &&
|
|
(datagram_size == lrh->datagram_size)) {
|
|
break;
|
|
}
|
|
}
|
|
if (lrh == NULL) {
|
|
/* rogue fragment */
|
|
MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
|
pbuf_free(p);
|
|
return ERR_OK;
|
|
}
|
|
|
|
if (lrh->pbuf->tot_len < datagram_offset) {
|
|
/* duplicate, ignore. */
|
|
pbuf_free(p);
|
|
return ERR_OK;
|
|
} else if (lrh->pbuf->tot_len > datagram_offset) {
|
|
MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
|
/* We have missed a fragment. Delete whole reassembly. */
|
|
dequeue_datagram(lrh);
|
|
pbuf_free(lrh->pbuf);
|
|
mem_free(lrh);
|
|
pbuf_free(p);
|
|
return ERR_OK;
|
|
}
|
|
pbuf_cat(lrh->pbuf, p);
|
|
p = NULL;
|
|
|
|
/* is packet now complete?*/
|
|
if (lrh->pbuf->tot_len >= lrh->datagram_size) {
|
|
/* dequeue from reass list. */
|
|
dequeue_datagram(lrh);
|
|
|
|
/* get pbuf */
|
|
p = lrh->pbuf;
|
|
|
|
/* release helper */
|
|
mem_free(lrh);
|
|
} else {
|
|
return ERR_OK;
|
|
}
|
|
}
|
|
|
|
if (p == NULL) {
|
|
return ERR_OK;
|
|
}
|
|
|
|
/* We have a complete packet, check dispatch for headers. */
|
|
puc = (u8_t*)p->payload;
|
|
|
|
if (*puc == 0x41) {
|
|
/* This is a complete IPv6 packet, just skip dispatch byte. */
|
|
pbuf_header(p, -1); /* hide dispatch byte. */
|
|
} else if ((*puc & 0xe0 )== 0x60) {
|
|
/* IPv6 headers are compressed using IPHC. */
|
|
p = lowpan6_decompress(p, &src, &dest);
|
|
if (p == NULL) {
|
|
MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
|
return ERR_OK;
|
|
}
|
|
} else {
|
|
MIB2_STATS_NETIF_INC(netif, ifindiscards);
|
|
pbuf_free(p);
|
|
return ERR_OK;
|
|
}
|
|
|
|
/* @todo: distinguish unicast/multicast */
|
|
MIB2_STATS_NETIF_INC(netif, ifinucastpkts);
|
|
|
|
return ip6_input(p, netif);
|
|
}
|
|
|
|
err_t
|
|
lowpan6_if_init(struct netif *netif)
|
|
{
|
|
netif->name[0] = 'L';
|
|
netif->name[1] = '6';
|
|
#if LWIP_IPV4
|
|
netif->output = lowpan4_output;
|
|
#endif /* LWIP_IPV4 */
|
|
netif->output_ip6 = lowpan6_output;
|
|
|
|
MIB2_INIT_NETIF(netif, snmp_ifType_other, 0);
|
|
|
|
/* maximum transfer unit */
|
|
netif->mtu = 1280;
|
|
|
|
/* broadcast capability */
|
|
netif->flags = NETIF_FLAG_BROADCAST /* | NETIF_FLAG_LOWPAN6 */;
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
err_t
|
|
lowpan6_set_pan_id(u16_t pan_id)
|
|
{
|
|
ieee_802154_pan_id = pan_id;
|
|
|
|
return ERR_OK;
|
|
}
|
|
|
|
/**
|
|
* Pass a received packet to tcpip_thread for input processing
|
|
*
|
|
* @param p the received packet, p->payload pointing to the
|
|
* IEEE 802.15.4 header.
|
|
* @param inp the network interface on which the packet was received
|
|
*/
|
|
err_t
|
|
tcpip_6lowpan_input(struct pbuf *p, struct netif *inp)
|
|
{
|
|
return tcpip_inpkt(p, inp, lowpan6_input);
|
|
}
|
|
|
|
#endif /* LWIP_IPV6 && LWIP_6LOWPAN */
|