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net: Add 6lowpan without compression header support

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Add support for IPv6 header dispatch (without IPv6 compression
and uncompression). Only IPv6 dispatch header will be added at the
beginning of the buffer.

Change-Id: I7400a4dd115ac3b4b3d9deecd3cdb9ea292573fb
Signed-off-by: Ravi kumar Veeramally <ravikumar.veeramally@linux.intel.com>
This commit is contained in:
Ravi kumar Veeramally 2016-07-11 11:03:30 +03:00 • committed by Jukka Rissanen
commit 1725ac66d7
3 changed files with 53 additions and 8 deletions
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56
net/yaip/6lo.c
View file

@ -751,20 +751,64 @@ fail:
return false;
}
bool net_6lo_compress(struct net_buf *buf)
/* Adds IPv6 dispatch as first byte and adjust fragments */
static inline bool compress_ipv6_header(struct net_buf *buf)
{
return compress_IPHC_header(buf);
struct net_buf *frag;
frag = net_nbuf_get_reserve_data(net_nbuf_ll_reserve(buf));
if (!frag) {
return false;
}
frag->data[0] = NET6LO_DISPATCH_IPV6;
net_buf_add(frag, 1);
net_buf_frag_insert(buf, frag);
/* compact the fragments, so that gaps will be filled */
buf->frags = net_nbuf_compact(buf->frags);
return true;
}
static inline bool uncompress_ipv6_header(struct net_buf *buf)
{
struct net_buf *frag = buf->frags;
/* Pull off IPv6 dispatch header and adjust data and length */
memmove(frag->data, frag->data + 1, frag->len - 1);
frag->len -= 1;
return true;
}
bool net_6lo_compress(struct net_buf *buf, bool iphc)
{
if (iphc) {
return compress_IPHC_header(buf);
} else {
return compress_ipv6_header(buf);
}
}
bool net_6lo_uncompress(struct net_buf *buf)
{
if (!buf || !buf->frags) {
return NULL;
return false;
}
if (!(buf->frags->data[0] & NET6LO_DISPATCH_IPHC)) {
return NULL;
if ((buf->frags->data[0] & NET6LO_DISPATCH_IPHC) ==
NET6LO_DISPATCH_IPHC) {
/* uncompress IPHC header */
return uncompress_IPHC_header(buf);
} else if ((buf->frags->data[0] & NET6LO_DISPATCH_IPV6) ==
NET6LO_DISPATCH_IPV6) {
/* uncompress IPv6 header, it has only IPv6 dispatch in the
* beginning */
return uncompress_ipv6_header(buf);
}
return uncompress_IPHC_header(buf);
return false;
}

3
net/yaip/6lo.h
View file

@ -36,10 +36,11 @@
* will be adjusted according to remaining space in fragments.
*
* @param Pointer to network buffer
* @param iphc true for IPHC compression, false for IPv6 dispatch header
*
* @return True on success, false otherwise
*/
bool net_6lo_compress(struct net_buf *buf);
bool net_6lo_compress(struct net_buf *buf, bool iphc);
/**
* @brief Unompress IPv6 packet as per RFC 6282

2
tests/net/6lo/src/main.c
View file

@ -374,7 +374,7 @@ static int test_6lo(struct net_6lo_data *data)
net_hexdump_frags("before-compression", buf);
#endif
if (!net_6lo_compress(buf)) {
if (!net_6lo_compress(buf, true)) {
TC_PRINT("compression failed\n");
goto end;
}