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sixlowpan: Refactor multicast destination compression handling

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Stateless only, still no implementation for context-aware multicast encoding.
This commit is contained in:
Joakim Gebart 2015-02-27 15:12:05 +01:00
parent 9769d8adaf
commit 334aeca246
1 changed files with 38 additions and 40 deletions
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78
sys/net/network_layer/sixlowpan/lowpan.c
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@ -1042,48 +1042,46 @@ uint8_t lowpan_iphc_encoding(int if_id, const uint8_t *dest, int dest_len,
/* 1: Destination address is a multicast address. */
lowpan_iphc[1] |= SIXLOWPAN_IPHC2_M;
/* just another cool if condition */
if ((ipv6_buf->destaddr.uint8[1] == 2) &&
(ipv6_buf->destaddr.uint16[1] == 0) &&
(ipv6_buf->destaddr.uint16[2] == 0) &&
(ipv6_buf->destaddr.uint16[3] == 0) &&
(ipv6_buf->destaddr.uint16[4] == 0) &&
(ipv6_buf->destaddr.uint16[5] == 0) &&
(ipv6_buf->destaddr.uint16[6] == 0) &&
(ipv6_buf->destaddr.uint8[14] == 0)) {
/* 11: 8 bits. The address takes the form FF02::00XX. */
lowpan_iphc[1] |= 0x03;
ipv6_hdr_fields[hdr_pos] = ipv6_buf->destaddr.uint8[15];
hdr_pos++;
}
else if ((ipv6_buf->destaddr.uint16[1] == 0) &&
(ipv6_buf->destaddr.uint16[2] == 0) &&
(ipv6_buf->destaddr.uint16[3] == 0) &&
(ipv6_buf->destaddr.uint16[4] == 0) &&
(ipv6_buf->destaddr.uint16[5] == 0) &&
(ipv6_buf->destaddr.uint8[12] == 0)) {
/* 10: 32 bits. The address takes the form FFXX::00XX:XXXX. */
lowpan_iphc[1] |= 0x02;
/* copy second and last 3 byte */
ipv6_hdr_fields[hdr_pos] = ipv6_buf->destaddr.uint8[1];
hdr_pos++;
memcpy(&ipv6_hdr_fields[hdr_pos], &ipv6_buf->destaddr.uint8[13], 3);
hdr_pos += 3;
}
else if ((ipv6_buf->destaddr.uint16[1] == 0) &&
(ipv6_buf->destaddr.uint16[2] == 0) &&
(ipv6_buf->destaddr.uint16[3] == 0) &&
(ipv6_buf->destaddr.uint16[4] == 0) &&
(ipv6_buf->destaddr.uint8[10] == 0)) {
/* 01: 48 bits. The address takes the form FFXX::00XX:XXXX:XXXX */
lowpan_iphc[1] |= 0x01;
/* copy second and last 5 byte */
ipv6_hdr_fields[hdr_pos] = ipv6_buf->destaddr.uint8[1];
hdr_pos++;
memcpy(&ipv6_hdr_fields[hdr_pos], &ipv6_buf->destaddr.uint8[11], 5);
hdr_pos += 5;
/* Check if we can compress any part of the address */
if ((ipv6_buf->destaddr.uint8[0] == 0xff) &&
(ipv6_buf->destaddr.uint16[1] == HTONS(0x0000u)) &&
(ipv6_buf->destaddr.uint32[1] == HTONL(0x00000000u)) &&
(ipv6_buf->destaddr.uint16[4] == HTONS(0x0000u)) &&
(ipv6_buf->destaddr.uint8[10] == 0x00)) {
/* If we got here then the address is on the form:
* FFXX:0000:0000:0000:0000:00XX:XXXX:XXXX
* which means that it can be compressed. */
if ((ipv6_buf->destaddr.uint8[1] == 0x02) &&
(ipv6_buf->destaddr.uint16[5] == HTONS(0x0000u)) &&
(ipv6_buf->destaddr.uint16[6] == HTONS(0x0000u)) &&
(ipv6_buf->destaddr.uint8[14] == 0x00)) {
/* 11: 8 bits. The address takes the form FF02::00XX. */
lowpan_iphc[1] |= 0x03;
ipv6_hdr_fields[hdr_pos] = ipv6_buf->destaddr.uint8[15];
hdr_pos++;
}
else if ((ipv6_buf->destaddr.uint16[5] == HTONS(0x0000u)) &&
(ipv6_buf->destaddr.uint8[12] == 0x00)) {
/* 10: 32 bits. The address takes the form FFXX::00XX:XXXX. */
lowpan_iphc[1] |= 0x02;
/* copy second and last 3 bytes */
ipv6_hdr_fields[hdr_pos] = ipv6_buf->destaddr.uint8[1];
hdr_pos++;
memcpy(&ipv6_hdr_fields[hdr_pos], &ipv6_buf->destaddr.uint8[13], 3);
hdr_pos += 3;
}
else {
/* 01: 48 bits. The address takes the form FFXX::00XX:XXXX:XXXX */
lowpan_iphc[1] |= 0x01;
/* copy second and last 5 byte */
ipv6_hdr_fields[hdr_pos] = ipv6_buf->destaddr.uint8[1];
hdr_pos++;
memcpy(&ipv6_hdr_fields[hdr_pos], &ipv6_buf->destaddr.uint8[11], 5);
hdr_pos += 5;
}
}
else {
/* Full 128 bit address */
memcpy(&ipv6_hdr_fields[hdr_pos], &ipv6_buf->destaddr.uint8[0], 16);
hdr_pos += 16;
}