diff options
Diffstat (limited to 'thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/lowpan6.c')
| -rw-r--r-- | thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/lowpan6.c | 1193 |
1 files changed, 1193 insertions, 0 deletions
diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/lowpan6.c b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/lowpan6.c new file mode 100644 index 0000000..9a84cbc --- /dev/null +++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/lwip/src/netif/lowpan6.c @@ -0,0 +1,1193 @@ +/** + * @file + * + * 6LowPAN output for IPv6. Uses ND tables for link-layer addressing. Fragments packets to 6LowPAN units. + */ + +/* + * Copyright (c) 2015 Inico Technologies Ltd. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright notice, + * this list of conditions and the following disclaimer in the documentation + * and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT + * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT + * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY + * OF SUCH DAMAGE. + * + * This file is part of the lwIP TCP/IP stack. + * + * Author: Ivan Delamer <delamer@inicotech.com> + * + * + * Please coordinate changes and requests with Ivan Delamer + * <delamer@inicotech.com> + */ + +/** + * @defgroup sixlowpan 6LowPAN netif + * @ingroup addons + * 6LowPAN netif implementation + */ + +#include "netif/lowpan6.h" + +#if LWIP_IPV6 && LWIP_6LOWPAN + +#include "lwip/ip.h" +#include "lwip/pbuf.h" +#include "lwip/ip_addr.h" +#include "lwip/netif.h" +#include "lwip/nd6.h" +#include "lwip/mem.h" +#include "lwip/udp.h" +#include "lwip/tcpip.h" +#include "lwip/snmp.h" + +#include <string.h> + +struct ieee_802154_addr { + u8_t addr_len; + u8_t addr[8]; +}; + +/** This is a helper struct. + */ +struct lowpan6_reass_helper { + struct pbuf *pbuf; + struct lowpan6_reass_helper *next_packet; + u8_t timer; + struct ieee_802154_addr sender_addr; + u16_t datagram_size; + u16_t datagram_tag; +}; + +static struct lowpan6_reass_helper * reass_list; + +#if LWIP_6LOWPAN_NUM_CONTEXTS > 0 +static ip6_addr_t lowpan6_context[LWIP_6LOWPAN_NUM_CONTEXTS]; +#endif + +static u16_t ieee_802154_pan_id; + +static const struct ieee_802154_addr ieee_802154_broadcast = {2, {0xff, 0xff}}; + +#if LWIP_6LOWPAN_INFER_SHORT_ADDRESS +static struct ieee_802154_addr short_mac_addr = {2, {0,0}}; +#endif /* LWIP_6LOWPAN_INFER_SHORT_ADDRESS */ + +static err_t dequeue_datagram(struct lowpan6_reass_helper *lrh); + +/** + * Periodic timer for 6LowPAN functions: + * + * - Remove incomplete/old packets + */ +void +lowpan6_tmr(void) +{ + struct lowpan6_reass_helper *lrh, *lrh_temp; + + lrh = reass_list; + while (lrh != NULL) { + lrh_temp = lrh->next_packet; + if ((--lrh->timer) == 0) { + dequeue_datagram(lrh); + pbuf_free(lrh->pbuf); + mem_free(lrh); + } + lrh = lrh_temp; + } +} + +/** + * Removes a datagram from the reassembly queue. + **/ +static err_t +dequeue_datagram(struct lowpan6_reass_helper *lrh) +{ + struct lowpan6_reass_helper *lrh_temp; + + if (reass_list == lrh) { + reass_list = reass_list->next_packet; + } else { + lrh_temp = reass_list; + while (lrh_temp != NULL) { + if (lrh_temp->next_packet == lrh) { + lrh_temp->next_packet = lrh->next_packet; + break; + } + lrh_temp = lrh_temp->next_packet; + } + } + + return ERR_OK; +} + +static s8_t +lowpan6_context_lookup(const ip6_addr_t *ip6addr) +{ + s8_t i; + + for (i = 0; i < LWIP_6LOWPAN_NUM_CONTEXTS; i++) { + if (ip6_addr_netcmp(&lowpan6_context[i], ip6addr)) { + return i; + } + } + + return -1; +} + +/* Determine compression mode for unicast address. */ +static s8_t +lowpan6_get_address_mode(const ip6_addr_t *ip6addr, const struct ieee_802154_addr *mac_addr) +{ + if (mac_addr->addr_len == 2) { + if ((ip6addr->addr[2] == (u32_t)PP_HTONL(0x000000ff)) && + ((ip6addr->addr[3] & PP_HTONL(0xffff0000)) == PP_NTOHL(0xfe000000))) { + if ((ip6addr->addr[3] & PP_HTONL(0x0000ffff)) == lwip_ntohl((mac_addr->addr[0] << 8) | mac_addr->addr[1])) { + return 3; + } + } + } else if (mac_addr->addr_len == 8) { + if ((ip6addr->addr[2] == lwip_ntohl(((mac_addr->addr[0] ^ 2) << 24) | (mac_addr->addr[1] << 16) | mac_addr->addr[2] << 8 | mac_addr->addr[3])) && + (ip6addr->addr[3] == lwip_ntohl((mac_addr->addr[4] << 24) | (mac_addr->addr[5] << 16) | mac_addr->addr[6] << 8 | mac_addr->addr[7]))) { + return 3; + } + } + + if ((ip6addr->addr[2] == PP_HTONL(0x000000ffUL)) && + ((ip6addr->addr[3] & PP_HTONL(0xffff0000)) == PP_NTOHL(0xfe000000UL))) { + return 2; + } + + return 1; +} + +/* Determine compression mode for multicast address. */ +static s8_t +lowpan6_get_address_mode_mc(const ip6_addr_t *ip6addr) +{ + if ((ip6addr->addr[0] == PP_HTONL(0xff020000)) && + (ip6addr->addr[1] == 0) && + (ip6addr->addr[2] == 0) && + ((ip6addr->addr[3] & PP_HTONL(0xffffff00)) == 0)) { + return 3; + } else if (((ip6addr->addr[0] & PP_HTONL(0xff00ffff)) == PP_HTONL(0xff000000)) && + (ip6addr->addr[1] == 0)) { + if ((ip6addr->addr[2] == 0) && + ((ip6addr->addr[3] & PP_HTONL(0xff000000)) == 0)) { + return 2; + } else if ((ip6addr->addr[2] & PP_HTONL(0xffffff00)) == 0) { + return 1; + } + } + + return 0; +} + +/* + * Encapsulates data into IEEE 802.15.4 frames. + * Fragments an IPv6 datagram into 6LowPAN units, which fit into IEEE 802.15.4 frames. + * If configured, will compress IPv6 and or UDP headers. + * */ +static err_t +lowpan6_frag(struct netif *netif, struct pbuf *p, const struct ieee_802154_addr *src, const struct ieee_802154_addr *dst) +{ + struct pbuf * p_frag; + u16_t frag_len, remaining_len; + u8_t * buffer; + u8_t ieee_header_len; + u8_t lowpan6_header_len; + s8_t i; + static u8_t frame_seq_num; + static u16_t datagram_tag; + u16_t datagram_offset; + err_t err = ERR_IF; + + /* We'll use a dedicated pbuf for building 6LowPAN fragments. */ + p_frag = pbuf_alloc(PBUF_RAW, 127, PBUF_RAM); + if (p_frag == NULL) { + MIB2_STATS_NETIF_INC(netif, ifoutdiscards); + return ERR_MEM; + } + + /* Write IEEE 802.15.4 header. */ + buffer = (u8_t*)p_frag->payload; + ieee_header_len = 0; + if (dst == &ieee_802154_broadcast) { + buffer[ieee_header_len++] = 0x01; /* data packet, no ack required. */ + } else { + buffer[ieee_header_len++] = 0x21; /* data packet, ack required. */ + } + buffer[ieee_header_len] = (0x00 << 4); /* 2003 frame version */ + buffer[ieee_header_len] |= (dst->addr_len == 2) ? (0x02 << 2) : (0x03 << 2); /* destination addressing mode */ + buffer[ieee_header_len] |= (src->addr_len == 2) ? (0x02 << 6) : (0x03 << 6); /* source addressing mode */ + ieee_header_len++; + buffer[ieee_header_len++] = frame_seq_num++; + + buffer[ieee_header_len++] = ieee_802154_pan_id & 0xff; /* pan id */ + buffer[ieee_header_len++] = (ieee_802154_pan_id >> 8) & 0xff; /* pan id */ + i = dst->addr_len; + while (i-- > 0) { + buffer[ieee_header_len++] = dst->addr[i]; + } + + buffer[ieee_header_len++] = ieee_802154_pan_id & 0xff; /* pan id */ + buffer[ieee_header_len++] = (ieee_802154_pan_id >> 8) & 0xff; /* pan id */ + i = src->addr_len; + while (i-- > 0) { + buffer[ieee_header_len++] = src->addr[i]; + } + +#if LWIP_6LOWPAN_IPHC + /* Perform 6LowPAN IPv6 header compression according to RFC 6282 */ + { + struct ip6_hdr *ip6hdr; + + /* Point to ip6 header and align copies of src/dest addresses. */ + ip6hdr = (struct ip6_hdr *)p->payload; + ip_addr_copy_from_ip6(ip_data.current_iphdr_dest, ip6hdr->dest); + ip_addr_copy_from_ip6(ip_data.current_iphdr_src, ip6hdr->src); + + /* Basic length of 6LowPAN header, set dispatch and clear fields. */ + lowpan6_header_len = 2; + buffer[ieee_header_len] = 0x60; + buffer[ieee_header_len + 1] = 0; + + /* Determine whether there will be a Context Identifier Extension byte or not. + * If so, set it already. */ +#if LWIP_6LOWPAN_NUM_CONTEXTS > 0 + buffer[ieee_header_len + 2] = 0; + + i = lowpan6_context_lookup(ip_2_ip6(&ip_data.current_iphdr_src)); + if (i >= 0) { + /* Stateful source address compression. */ + buffer[ieee_header_len + 1] |= 0x40; + buffer[ieee_header_len + 2] |= (i & 0x0f) << 4; + } + + i = lowpan6_context_lookup(ip_2_ip6(&ip_data.current_iphdr_dest)); + if (i >= 0) { + /* Stateful destination address compression. */ + buffer[ieee_header_len + 1] |= 0x04; + buffer[ieee_header_len + 2] |= i & 0x0f; + } + + if (buffer[ieee_header_len + 2] != 0x00) { + /* Context identifier extension byte is appended. */ + buffer[ieee_header_len + 1] |= 0x80; + lowpan6_header_len++; + } +#endif /* LWIP_6LOWPAN_NUM_CONTEXTS > 0 */ + + /* Determine TF field: Traffic Class, Flow Label */ + if (IP6H_FL(ip6hdr) == 0) { + /* Flow label is elided. */ + buffer[ieee_header_len] |= 0x10; + if (IP6H_TC(ip6hdr) == 0) { + /* Traffic class (ECN+DSCP) elided too. */ + buffer[ieee_header_len] |= 0x08; + } else { + /* Traffic class (ECN+DSCP) appended. */ + buffer[ieee_header_len + lowpan6_header_len++] = IP6H_TC(ip6hdr); + } + } else { + if (((IP6H_TC(ip6hdr) & 0x3f) == 0)) { + /* DSCP portion of Traffic Class is elided, ECN and FL are appended (3 bytes) */ + buffer[ieee_header_len] |= 0x08; + + buffer[ieee_header_len + lowpan6_header_len] = IP6H_TC(ip6hdr) & 0xc0; + buffer[ieee_header_len + lowpan6_header_len++] |= (IP6H_FL(ip6hdr) >> 16) & 0x0f; + buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff; + buffer[ieee_header_len + lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff; + } else { + /* Traffic class and flow label are appended (4 bytes) */ + buffer[ieee_header_len + lowpan6_header_len++] = IP6H_TC(ip6hdr); + buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 16) & 0x0f; + buffer[ieee_header_len + lowpan6_header_len++] = (IP6H_FL(ip6hdr) >> 8) & 0xff; + buffer[ieee_header_len + lowpan6_header_len++] = IP6H_FL(ip6hdr) & 0xff; + } + } + + /* Compress NH? + * Only if UDP for now. @todo support other NH compression. */ + if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) { + buffer[ieee_header_len] |= 0x04; + } else { + /* append nexth. */ + buffer[ieee_header_len + lowpan6_header_len++] = IP6H_NEXTH(ip6hdr); + } + + /* Compress hop limit? */ + if (IP6H_HOPLIM(ip6hdr) == 255) { + buffer[ieee_header_len] |= 0x03; + } else if (IP6H_HOPLIM(ip6hdr) == 64) { + buffer[ieee_header_len] |= 0x02; + } else if (IP6H_HOPLIM(ip6hdr) == 1) { + buffer[ieee_header_len] |= 0x01; + } else { + /* append hop limit */ + buffer[ieee_header_len + lowpan6_header_len++] = IP6H_HOPLIM(ip6hdr); + } + + /* Compress source address */ + if (((buffer[ieee_header_len + 1] & 0x40) != 0) || + (ip6_addr_islinklocal(ip_2_ip6(&ip_data.current_iphdr_src)))) { + /* Context-based or link-local source address compression. */ + i = lowpan6_get_address_mode(ip_2_ip6(&ip_data.current_iphdr_src), src); + buffer[ieee_header_len + 1] |= (i & 0x03) << 4; + if (i == 1) { + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 16, 8); + lowpan6_header_len += 8; + } else if (i == 2) { + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 22, 2); + lowpan6_header_len += 2; + } + } else if (ip6_addr_isany(ip_2_ip6(&ip_data.current_iphdr_src))) { + /* Special case: mark SAC and leave SAM=0 */ + buffer[ieee_header_len + 1] |= 0x40; + } else { + /* Append full address. */ + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 8, 16); + lowpan6_header_len += 16; + } + + /* Compress destination address */ + if (ip6_addr_ismulticast(ip_2_ip6(&ip_data.current_iphdr_dest))) { + /* @todo support stateful multicast address compression */ + + buffer[ieee_header_len + 1] |= 0x08; + + i = lowpan6_get_address_mode_mc(ip_2_ip6(&ip_data.current_iphdr_dest)); + buffer[ieee_header_len + 1] |= i & 0x03; + if (i == 0) { + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 24, 16); + lowpan6_header_len += 16; + } else if (i == 1) { + buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[25]; + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 35, 5); + lowpan6_header_len += 5; + } else if (i == 2) { + buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[25]; + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 37, 3); + lowpan6_header_len += 3; + } else if (i == 3) { + buffer[ieee_header_len + lowpan6_header_len++] = ((u8_t *)p->payload)[39]; + } + } else if (((buffer[ieee_header_len + 1] & 0x04) != 0) || + (ip6_addr_islinklocal(ip_2_ip6(&ip_data.current_iphdr_dest)))) { + /* Context-based or link-local destination address compression. */ + i = lowpan6_get_address_mode(ip_2_ip6(&ip_data.current_iphdr_dest), dst); + buffer[ieee_header_len + 1] |= i & 0x03; + if (i == 1) { + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 32, 8); + lowpan6_header_len += 8; + } else if (i == 2) { + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 38, 2); + lowpan6_header_len += 2; + } + } else { + /* Append full address. */ + MEMCPY(buffer + ieee_header_len + lowpan6_header_len, (u8_t*)p->payload + 24, 16); + lowpan6_header_len += 16; + } + + /* Move to payload. */ + pbuf_header(p, -IP6_HLEN); + + /* Compress UDP header? */ + if (IP6H_NEXTH(ip6hdr) == IP6_NEXTH_UDP) { + /* @todo support optional checksum compression */ + + buffer[ieee_header_len + lowpan6_header_len] = 0xf0; + + /* determine port compression mode. */ + if ((((u8_t *)p->payload)[0] == 0xf0) && ((((u8_t *)p->payload)[1] & 0xf0) == 0xb0) && + (((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 + */ +err_t +lowpan6_output(struct netif *netif, struct pbuf *q, const ip6_addr_t *ip6addr) +{ + err_t result; + const u8_t *hwaddr; + 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 */ + + /* Ask ND6 what to do with the packet. */ + result = nd6_get_next_hop_addr_or_queue(netif, q, ip6addr, &hwaddr); + if (result != ERR_OK) { + MIB2_STATS_NETIF_INC(netif, ifoutdiscards); + return result; + } + + /* If no hardware address is returned, nd6 has queued the packet for later. */ + if (hwaddr == NULL) { + return ERR_OK; + } + + /* Send out the packet using the returned hardware address. */ + dest.addr_len = netif->hwaddr_len; + SMEMCPY(dest.addr, hwaddr, netif->hwaddr_len); + MIB2_STATS_NETIF_INC(netif, ifoutucastpkts); + return lowpan6_frag(netif, q, &src, &dest); +} + +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] = lwip_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] = lwip_htonl(0xfe000000UL | (src->addr[0] << 8) | src->addr[1]); + } else { + ip6hdr->src.addr[2] = lwip_htonl(((src->addr[0] ^ 2) << 24) | (src->addr[1] << 16) | + (src->addr[2] << 8) | src->addr[3]); + ip6hdr->src.addr[3] = lwip_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] = lwip_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] = lwip_htonl(0xfe000000UL | (src->addr[0] << 8) | src->addr[1]); + } else { + ip6hdr->src.addr[2] = lwip_htonl(((src->addr[0] ^ 2) << 24) | (src->addr[1] << 16) | (src->addr[2] << 8) | src->addr[3]); + ip6hdr->src.addr[3] = lwip_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] = lwip_htonl(0xff000000UL | (lowpan6_buffer[lowpan6_offset++] << 16)); + ip6hdr->dest.addr[1] = 0; + ip6hdr->dest.addr[2] = lwip_htonl(lowpan6_buffer[lowpan6_offset++]); + ip6hdr->dest.addr[3] = lwip_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] = lwip_htonl(0xff000000UL | lowpan6_buffer[lowpan6_offset++]); + ip6hdr->dest.addr[1] = 0; + ip6hdr->dest.addr[2] = 0; + ip6hdr->dest.addr[3] = lwip_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] = lwip_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] = lwip_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] = lwip_htonl(0xfe000000UL | (dest->addr[0] << 8) | dest->addr[1]); + } else { + ip6hdr->dest.addr[2] = lwip_htonl(((dest->addr[0] ^ 2) << 24) | (dest->addr[1] << 16) | dest->addr[2] << 8 | dest->addr[3]); + ip6hdr->dest.addr[3] = lwip_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 = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]); + udphdr->dest = lwip_htons(lowpan6_buffer[lowpan6_offset + 2] << 8 | lowpan6_buffer[lowpan6_offset + 3]); + lowpan6_offset += 4; + } else if (i == 0x01) { + udphdr->src = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]); + udphdr->dest = lwip_htons(0xf000 | lowpan6_buffer[lowpan6_offset + 2]); + lowpan6_offset += 3; + } else if (i == 0x02) { + udphdr->src = lwip_htons(0xf000 | lowpan6_buffer[lowpan6_offset]); + udphdr->dest = lwip_htons(lowpan6_buffer[lowpan6_offset + 1] << 8 | lowpan6_buffer[lowpan6_offset + 2]); + lowpan6_offset += 3; + } else if (i == 0x03) { + udphdr->src = lwip_htons(0xf0b0 | ((lowpan6_buffer[lowpan6_offset] >> 4) & 0x0f)); + udphdr->dest = lwip_htons(0xf0b0 | (lowpan6_buffer[lowpan6_offset] & 0x0f)); + lowpan6_offset += 1; + } + + udphdr->chksum = lwip_htons(lowpan6_buffer[lowpan6_offset] << 8 | lowpan6_buffer[lowpan6_offset + 1]); + lowpan6_offset += 2; + udphdr->len = lwip_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; +} + +#if !NO_SYS +/** + * 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 /* !NO_SYS */ + +#endif /* LWIP_IPV6 && LWIP_6LOWPAN */ |