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fixed bug in compression and moved variables to start of function

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This commit is contained in:
Joakim Eriksson 2017-06-16 23:55:14 +02:00
parent 1ca0eda380
commit 3b5bfadaad
1 changed files with 19 additions and 24 deletions
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43
core/net/ipv6/sicslowpan.c
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@ -163,8 +163,8 @@
#ifdef SICSLOWPAN_CONF_COMPRESS_EXT_HDR
#define COMPRESS_EXT_HDR SICSLOWPAN_CONF_COMPRESS_EXT_HDR
#else
/* avoid compressing by default - to be compatible with older versions */
#define COMPRESS_EXT_HDR 0
/* Compressing on by default - turn off to be compatible with older versions */
#define COMPRESS_EXT_HDR 1
#endif
#if COMPRESS_EXT_HDR
@ -675,6 +675,8 @@ static void
compress_hdr_iphc(linkaddr_t *link_destaddr)
{
uint8_t tmp, iphc0, iphc1, *next_hdr, *next_nhc;
int ext_hdr_len;
#if LOG_DBG_ENABLED
{ uint16_t ndx;
LOG_DBG("before compression (%d): ", UIP_IP_BUF->len[1]);
@ -885,8 +887,8 @@ compress_hdr_iphc(linkaddr_t *link_destaddr)
/* pick out the next-header position */
next_hdr = &UIP_IP_BUF->proto;
next_nhc = hc06_ptr; /* here we set the next header is compressed. */
ext_hdr_len = 0;
/* reserve the write place of this next header position */
int ext_hdr_len = 0;
LOG_INFO("Compressing first header: %d\n", *next_hdr);
while(next_hdr != NULL && IS_COMPRESSABLE_PROTO(*next_hdr)) {
LOG_INFO("Compressing next header: %d\n", *next_hdr);
@ -902,10 +904,10 @@ compress_hdr_iphc(linkaddr_t *link_destaddr)
case UIP_PROTO_DESTO:
/* Handle the header here! */
{
proto = proto == -1 ? SICSLOWPAN_NHC_ETX_HDR_DESTO : proto;
struct uip_ext_hdr *ext_hdr =
(struct uip_ext_hdr *) UIP_IPPAYLOAD_BUF(ext_hdr_len);
int len;
proto = proto == -1 ? SICSLOWPAN_NHC_ETX_HDR_DESTO : proto;
/* Len is defined to be in octets from the length byte */
len = (ext_hdr->len << 3) + 8;
LOG_INFO("Handling next header: %d (len:%d)\n", *next_hdr, len);
@ -981,10 +983,8 @@ compress_hdr_iphc(linkaddr_t *link_destaddr)
hc06_ptr += 4;
}
/* always inline the checksum */
if(1) {
memcpy(hc06_ptr, &udp_buf->udpchksum, 2);
hc06_ptr += 2;
}
memcpy(hc06_ptr, &udp_buf->udpchksum, 2);
hc06_ptr += 2;
uncomp_hdr_len += UIP_UDPH_LEN;
/* this is the final header... */
next_hdr = NULL;
@ -992,7 +992,6 @@ compress_hdr_iphc(linkaddr_t *link_destaddr)
default:
LOG_INFO("Error - could not handle compression of header");
}
uncomp_hdr_len += UIP_UDPH_LEN;
}
if(next_hdr != NULL) {
/* Last header could not be compressed - we assume that this is then OK!*/
@ -1015,7 +1014,6 @@ compress_hdr_iphc(linkaddr_t *link_destaddr)
#endif
packetbuf_hdr_len = hc06_ptr - packetbuf_ptr;
return;
}
/*--------------------------------------------------------------------*/
@ -1038,7 +1036,12 @@ compress_hdr_iphc(linkaddr_t *link_destaddr)
static void
uncompress_hdr_iphc(uint8_t *buf, uint16_t ip_len)
{
uint8_t tmp, iphc0, iphc1;
uint8_t tmp, iphc0, iphc1, nhc;
struct uip_ext_hdr *exthdr;
uint8_t* last_nextheader;
uint8_t* ip_payload;
uint8_t ext_hdr_len = 0;
/* at least two byte will be used for the encoding */
hc06_ptr = packetbuf_ptr + packetbuf_hdr_len + 2;
@ -1182,12 +1185,11 @@ uncompress_hdr_iphc(uint8_t *buf, uint16_t ip_len)
uncomp_hdr_len += UIP_IPH_LEN;
/* Next header processing - continued */
uint8_t nhc = iphc0 & SICSLOWPAN_IPHC_NH_C;
nhc = iphc0 & SICSLOWPAN_IPHC_NH_C;
/* The next header is compressed, NHC is following */
uint8_t* last_nextheader = &SICSLOWPAN_IP_BUF(buf)->proto;
uint8_t* ip_payload = SICSLOWPAN_IPPAYLOAD_BUF(buf);
uint8_t ext_hdr_len = 0;
last_nextheader = &SICSLOWPAN_IP_BUF(buf)->proto;
ip_payload = SICSLOWPAN_IPPAYLOAD_BUF(buf);
while(nhc && (*hc06_ptr & SICSLOWPAN_NHC_MASK) == SICSLOWPAN_NHC_EXT_HDR) {
uint8_t eid = (*hc06_ptr & 0x0e) >> 1;
/* next header compression flag */
@ -1227,7 +1229,7 @@ uncompress_hdr_iphc(uint8_t *buf, uint16_t ip_len)
}
*last_nextheader = proto;
/* uncompress the extension header */
struct uip_ext_hdr *exthdr = (struct uip_ext_hdr *)ip_payload;
exthdr = (struct uip_ext_hdr *)ip_payload;
exthdr->len = (2 + len) / 8 - 1;
exthdr->next = next;
last_nextheader = &exthdr->next;
@ -1328,13 +1330,6 @@ uncompress_hdr_iphc(uint8_t *buf, uint16_t ip_len)
SICSLOWPAN_IP_BUF(buf)->len[0] = (ip_len - UIP_IPH_LEN) >> 8;
SICSLOWPAN_IP_BUF(buf)->len[1] = (ip_len - UIP_IPH_LEN) & 0x00FF;
}
/* length field in UDP header */
if(SICSLOWPAN_IP_BUF(buf)->proto == UIP_PROTO_UDP) {
memcpy(&SICSLOWPAN_UDP_BUF(buf)->udplen, &SICSLOWPAN_IP_BUF(buf)->len[0], 2);
}
return;
}
/** @} */
#endif /* SICSLOWPAN_COMPRESSION == SICSLOWPAN_COMPRESSION_HC06 */