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fixed bug that caused problems when uncompressing unspecified address

This commit is contained in:
joxe 2010-06-06 12:44:12 +00:00
parent 17209e8fa4
commit e75c77937e
1 changed files with 26 additions and 8 deletions
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34
core/net/sicslowpan.c
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@ -32,7 +32,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: sicslowpan.c,v 1.43 2010/06/01 12:37:54 joxe Exp $
* $Id: sicslowpan.c,v 1.44 2010/06/06 12:44:12 joxe Exp $
*/
/**
* \file
@ -259,14 +259,27 @@ static struct sicslowpan_addr_context *context;
/** pointer to the byte where to write next inline field. */
static uint8_t *hc06_ptr;
/* Uncompression of linklocal and other */
/* 0 -> 16 bits from packet */
/* 1 -> 2 bits from prefix - bunch of zeroes and 8 from packet */
/* 2 -> 2 bits from prefix - zeroes + 2 from packet */
/* 3 -> 2 bits from prefix - infer 8 bytes from lladdr */
/* Uncompression of linklocal */
/* 0 -> 16 bytes from packet */
/* 1 -> 2 bytes from prefix - bunch of zeroes and 8 from packet */
/* 2 -> 2 bytes from prefix - zeroes + 2 from packet */
/* 3 -> 2 bytes from prefix - infer 8 bytes from lladdr */
/* NOTE: => the uncompress function does change 0xf to 0x10 */
/* NOTE: 0x00 => no-autoconfig => unspecified */
const uint8_t unc_llconf[] = {0x0f,0x28,0x22,0x20};
const uint8_t unc_ctxconf[] = {0x0f,0x88,0x82,0x80};
/* Uncompression of ctx-based */
/* 0 -> 0 bits from packet [unspecified / reserved] */
/* 1 -> 8 bytes from prefix - bunch of zeroes and 8 from packet */
/* 2 -> 8 bytes from prefix - zeroes + 2 from packet */
/* 3 -> 8 bytes from prefix - infer 8 bytes from lladdr */
const uint8_t unc_ctxconf[] = {0x00,0x88,0x82,0x80};
/* Uncompression of ctx-based */
/* 0 -> 0 bits from packet */
/* 1 -> 2 bytes from prefix - bunch of zeroes 5 from packet */
/* 2 -> 2 bytes from prefix - zeroes + 3 from packet */
/* 3 -> 2 bytes from prefix - infer 1 bytes from lladdr */
const uint8_t unc_mxconf[] = {0x0f, 0x25, 0x23, 0x21};
/* Link local prefix */
@ -355,7 +368,8 @@ uncompress_addr(uip_ipaddr_t *ipaddr, uint8_t const prefix[],
if(postcount > 0) {
memcpy(&ipaddr->u8[16 - postcount], hc06_ptr, postcount);
hc06_ptr += postcount;
} else {
} else if (prefcount > 0){
/* no IID based configuration if no prefix and no data => unspec */
uip_ds6_set_addr_iid(ipaddr, lladdr);
}
@ -1555,6 +1569,10 @@ input(void)
* and rime_hdr_len are non 0, frag_offset is.
* If this is a subsequent fragment, this is the contrary.
*/
if(packetbuf_datalen() < rime_hdr_len) {
PRINTF("SICSLOWPAN: packet dropped due to header > total packet\n");
return;
}
rime_payload_len = packetbuf_datalen() - rime_hdr_len;
memcpy((void *)SICSLOWPAN_IP_BUF + uncomp_hdr_len + (u16_t)(frag_offset << 3), rime_ptr + rime_hdr_len, rime_payload_len);