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This change backs out the 'misconception' fix of 76e6dba2e4 and reimplements it in a way that actually seems to work.

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This commit is contained in:
Gregory Nutt 2017-06-30 12:39:00 -06:00
parent e19c52ed6e
commit 7de86f1ab4
1 changed files with 50 additions and 8 deletions
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56
net/sixlowpan/sixlowpan_hc06.c
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@ -251,16 +251,23 @@ static uint8_t compress_ipaddr(FAR const net_ipv6addr_t ipaddr, uint8_t bitpos)
{
/* Compress IID to 16 bits: xxxx:xxxx:xxxx:xxxx:0000:00ff:fe00:XXXX */
memcpy(g_hc06ptr, &ipaddr[7], 2);
g_hc06ptr += 2;
*g_hc06ptr++ = ipaddr[7] >> 8; /* Big-endian, network order */
*g_hc06ptr++ = ipaddr[7] & 0xff;
return 2 << bitpos; /* 16-bits */
}
else
{
int i;
/* Do not compress IID: xxxx:xxxx:xxxx:xxxx:IID:IID:IID:IID */
memcpy(g_hc06ptr, &ipaddr[4], 8);
g_hc06ptr += 8;
for (i = 4; i < 8; i++)
{
*g_hc06ptr++ = ipaddr[i] >> 8; /* Big-endian, network order */
*g_hc06ptr++ = ipaddr[i] & 0xff;
}
return 1 << bitpos; /* 64-bits */
}
}
@ -354,6 +361,7 @@ static void uncompress_addr(FAR const struct ieee802154_addr_s *addr,
FAR net_ipv6addr_t ipaddr)
{
FAR const uint8_t *srcptr;
bool fullmac = false;
bool usemac = (prefpost & 0x0100) != 0;
uint8_t prefcount = (prefpost >> 4) & 0xf;
uint8_t postcount = prefpost & 0x0f;
@ -383,6 +391,12 @@ static void uncompress_addr(FAR const struct ieee802154_addr_s *addr,
{
postcount = addrsize;
}
/* If we are converting the entire MAC address, then we need to some some
* special bit operations.
*/
fullmac = (postcount == addrsize);
}
/* Copy any prefix */
@ -405,9 +419,6 @@ static void uncompress_addr(FAR const struct ieee802154_addr_s *addr,
if (postcount > 0)
{
FAR uint8_t *destptr = (FAR uint8_t *)&ipaddr[0];
int offset = 16 - postcount;
if (postcount == 2 && prefcount < 11)
{
/* 16 bits uncompression ipaddr=0000:00ff:fe00:XXXX */
@ -416,7 +427,38 @@ static void uncompress_addr(FAR const struct ieee802154_addr_s *addr,
ipaddr[6] = HTONS(0xfe00);
}
/* If the postcount is even then take extra care with endian-ness */
if ((postcount & 1) == 0)
{
int destndx = 8 - (postcount >> 1);
int i;
for (i = destndx; i < 8; i++)
{
/* Big-endian, network order */
ipaddr[i] = (uint16_t)srcptr[0] << 8 | (uint16_t)srcptr[1];
srcptr += 2;
}
/* If the was a standard MAC based address then toggle */
if (fullmac)
{
ipaddr[destndx] ^= 0x0200;
}
}
/* postcount is odd... REVISIT: I am not sure about bye ordering. */
else
{
FAR uint8_t *destptr = (FAR uint8_t *)&ipaddr[0];
int offset = 16 - postcount;
memcpy(&destptr[offset], srcptr, postcount);
}
/* If we took the data from packet, then update the packet pointer */