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sys/net/network_layer/sixlowpan/lowpan.c: add udp header decompression

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This commit is contained in:
Johann Fischer 2015-02-21 12:03:46 +01:00
parent 023fef4d1c
commit 939f07aab8
2 changed files with 26 additions and 8 deletions
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2
sys/net/include/sixlowpan/lowpan.h
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@ -78,6 +78,8 @@ extern "C" {
* </a>
*/
#define SIXLOWPAN_IPHC1_NH (0x04)
#define SIXLOWPAN_NHC_UDP_MASK (0xF8)
#define SIXLOWPAN_NHC_UDP_ID (0xF0)
/**
* @brief Flag for Context Identifier Extention (part of second byte

32
sys/net/network_layer/sixlowpan/lowpan.c
View File

@ -1233,10 +1233,7 @@ void lowpan_iphc_decoding(uint8_t *data, uint8_t length, net_if_eui64_t *s_addr,
}
/* NH: Next Header: */
if (lowpan_iphc[0] & SIXLOWPAN_IPHC1_NH) {
// TODO: next header decompression
}
else {
if (!(lowpan_iphc[0] & SIXLOWPAN_IPHC1_NH)) {
ipv6_buf->nextheader = ipv6_hdr_fields[hdr_pos];
hdr_pos++;
}
@ -1474,11 +1471,30 @@ void lowpan_iphc_decoding(uint8_t *data, uint8_t length, net_if_eui64_t *s_addr,
uint8_t *ptr = get_payload_buf(ipv6_ext_hdr_len);
memcpy(ptr, &ipv6_hdr_fields[hdr_pos], length - hdr_pos);
if (lowpan_iphc[0] & SIXLOWPAN_IPHC1_NH) {
if ((ipv6_hdr_fields[hdr_pos] & SIXLOWPAN_NHC_UDP_MASK) == SIXLOWPAN_NHC_UDP_ID) {
ipv6_buf->nextheader = IPV6_PROTO_NUM_UDP;
/* ipv6 length */
ipv6_buf->length = HTONS(length - hdr_pos + 1);
packet_length = IPV6_HDR_LEN + ipv6_buf->length;
/* ipv6 length */
ipv6_buf->length = HTONS(length - hdr_pos);
packet_length = IPV6_HDR_LEN + ipv6_buf->length;
hdr_pos ++;
/* copy inline src_port and dst_port */
memcpy(ptr, &ipv6_hdr_fields[hdr_pos], 4);
hdr_pos += 4;
ptr += 4;
/* insert length value */
*((uint16_t*)ptr) = ipv6_buf->length;
ptr += 2;
}
}
else {
/* ipv6 length */
ipv6_buf->length = HTONS(length - hdr_pos);
packet_length = IPV6_HDR_LEN + ipv6_buf->length;
}
memcpy(ptr, &ipv6_hdr_fields[hdr_pos], length - hdr_pos);
}
uint8_t lowpan_context_len(void)