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added hooks for adding an external header compressor

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This commit is contained in:
joxe 2010-03-17 12:08:59 +00:00
parent ea090a60e6
commit e8916fe01f
2 changed files with 49 additions and 10 deletions
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32
core/net/sicslowpan.c
View file

@ -32,7 +32,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: sicslowpan.c,v 1.29 2010/03/16 10:21:04 joxe Exp $
* $Id: sicslowpan.c,v 1.30 2010/03/17 12:08:59 joxe Exp $
*/
/**
* \file
@ -168,6 +168,11 @@ void uip_log(char *msg);
/** A pointer to the mac driver */
const struct mac_driver *sicslowpan_mac;
#ifdef SICSLOWPAN_NH_COMPRESSOR
/** A pointer to the additional compressor */
extern struct sicslowpan_nh_compressor SICSLOWPAN_NH_COMPRESSOR;
#endif
/**
* A pointer to the rime buffer.
* We initialize it to the beginning of the rime buffer, then
@ -467,7 +472,7 @@ compress_hdr_hc06(rimeaddr_t *rime_destaddr)
RIME_IPHC_BUF[0] |= SICSLOWPAN_IPHC_TC_C;
*hc06_ptr = (tmp & 0xc0) |
(UIP_IP_BUF->tcflow & 0x0F);
memcpy(hc06_ptr + 1, &UIP_IP_BUF->flow, 2);
memcpy(hc06_ptr + 1, &UIP_IP_BUF->flow, 2);
hc06_ptr += 3;
} else {
/* compress nothing */
@ -484,13 +489,17 @@ compress_hdr_hc06(rimeaddr_t *rime_destaddr)
#if UIP_CONF_UDP
if(UIP_IP_BUF->proto == UIP_PROTO_UDP) {
RIME_IPHC_BUF[0] |= SICSLOWPAN_IPHC_NH_C;
} else {
}
#endif /*UIP_CONF_UDP*/
#ifdef SICSLOWPAN_NH_COMPRESSOR
if(SICSLOWPAN_NH_COMPRESSOR.is_compressable(UIP_IP_BUF->proto)) {
RIME_IPHC_BUF[0] |= SICSLOWPAN_IPHC_NH_C;
}
#endif
if ((RIME_IPHC_BUF[0] & SICSLOWPAN_IPHC_NH_C) == 0) {
*hc06_ptr = UIP_IP_BUF->proto;
hc06_ptr += 1;
#if UIP_CONF_UDP
}
#endif /*UIP_CONF_UDP*/
}
/*
* Hop limit
@ -620,6 +629,10 @@ compress_hdr_hc06(rimeaddr_t *rime_destaddr)
uncomp_hdr_len += UIP_UDPH_LEN;
}
#endif /*UIP_CONF_UDP*/
#ifdef SICSLOWPAN_NH_COMPRESSOR
/* if nothing to compress just return zero */
hc06_ptr += SICSLOWPAN_NH_COMPRESSOR.compress(hc06_ptr, &uncomp_hdr_len);
#endif
rime_hdr_len = hc06_ptr - rime_ptr;
return;
}
@ -856,7 +869,7 @@ uncompress_hdr_hc06(u16_t ip_len) {
/* Next header processing - continued */
if((RIME_IPHC_BUF[0] & SICSLOWPAN_IPHC_NH_C)) {
/* The next header is compressed, NHC is following */
if((*hc06_ptr & SICSLOWPAN_NDC_UDP_MASK) == SICSLOWPAN_NHC_UDP_ID) {
if((*hc06_ptr & SICSLOWPAN_NHC_UDP_MASK) == SICSLOWPAN_NHC_UDP_ID) {
SICSLOWPAN_IP_BUF->proto = UIP_PROTO_UDP;
switch(*hc06_ptr) {
case SICSLOWPAN_NHC_UDP_C:
@ -886,6 +899,11 @@ uncompress_hdr_hc06(u16_t ip_len) {
}
uncomp_hdr_len += UIP_UDPH_LEN;
}
#ifdef SICSLOWPAN_NH_COMPRESSOR
else {
hc06_ptr += SICSLOWPAN_NH_COMPRESSOR.uncompress(hc06_ptr, sicslowpan_buf, &uncomp_hdr_len);
}
#endif
}
rime_hdr_len = hc06_ptr - rime_ptr;

27
core/net/sicslowpan.h
View file

@ -33,7 +33,7 @@
*
* This file is part of the Contiki operating system.
*
* $Id: sicslowpan.h,v 1.10 2010/03/16 10:21:04 joxe Exp $
* $Id: sicslowpan.h,v 1.11 2010/03/17 12:08:59 joxe Exp $
*/
/**
* \file
@ -137,13 +137,15 @@
#define SICSLOWPAN_IPHC_MCAST_RANGE 0xA0
/** @} */
#define SICSLOWPAN_NDC_UDP_MASK 0xF8
/* NHC_EXT_HDR */
#define SICSLOWPAN_NHC_MASK 0xF0
#define SICSLOWPAN_NHC_EXT_HDR 0xE0
/**
* \name LOWPAN_UDP encoding (works together with IPHC)
* @{
*/
#define SICSLOWPAN_NHC_UDP_MASK 0xF8
#define SICSLOWPAN_NHC_UDP_ID 0xF0
#define SICSLOWPAN_NHC_UDP_C 0xF3
#define SICSLOWPAN_NHC_UDP_I 0xF0
@ -284,6 +286,25 @@ struct sicslowpan_addr_context {
/** @} */
/**
* The structure of a next header compressor.
*
* TODO: needs more parameters when compressing extension headers, etc.
*/
struct sicslowpan_nh_compressor {
int (* is_compressable)(uint8_t next_header);
/** compress next header (TCP/UDP, etc) - ptr points to next header to
compress */
int (* compress)(uint8_t *compressed, uint8_t *uncompressed_len);
/** uncompress next header (TCP/UDP, etc) - ptr points to next header to
uncompress */
int (* uncompress)(uint8_t *compressed, uint8_t *lowpanbuf, uint8_t *uncompressed_len);
};
extern const struct network_driver sicslowpan_driver;
extern const struct mac_driver *sicslowpan_mac;