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Make frame fcf creation and parsing standalone functions

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This commit is contained in:
Laurent Deru 2016-12-22 09:00:38 +01:00
parent 0ceb45ee78
commit 9b6ba3c009
2 changed files with 42 additions and 26 deletions
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66
core/net/mac/frame802154.c
View file

@ -183,7 +183,7 @@ frame802154_has_panid(frame802154_fcf_t *fcf, int *has_src_pan_id, int *has_dest
} else {
/* No PAN ID in ACK */
if(fcf->frame_type != FRAME802154_ACKFRAME) {
if(!fcf->panid_compression && fcf->src_addr_mode & 3) {
if(!fcf->panid_compression && (fcf->src_addr_mode & 3)) {
/* If compressed, don't include source PAN ID */
src_pan_id = 1;
}
@ -304,7 +304,7 @@ field_len(frame802154_t *p, field_length_t *flen)
* up to the caller. */
if(p->fcf.frame_version < FRAME802154_IEEE802154E_2012) {
/* Set PAN ID compression bit if src pan id matches dest pan id. */
if(p->fcf.dest_addr_mode & 3 && p->fcf.src_addr_mode & 3 &&
if((p->fcf.dest_addr_mode & 3) && (p->fcf.src_addr_mode & 3) &&
p->src_pid == p->dest_pid) {
p->fcf.panid_compression = 1;
} else {
@ -362,6 +362,20 @@ frame802154_hdrlen(frame802154_t *p)
return 2 + flen.seqno_len + flen.dest_pid_len + flen.dest_addr_len +
flen.src_pid_len + flen.src_addr_len + flen.aux_sec_len;
}
void
frame802154_create_fcf(frame802154_fcf_t *fcf, uint8_t *buf)
{
buf[0] = (fcf->frame_type & 7) |
((fcf->security_enabled & 1) << 3) |
((fcf->frame_pending & 1) << 4) |
((fcf->ack_required & 1) << 5) |
((fcf->panid_compression & 1) << 6);
buf[1] = ((fcf->sequence_number_suppression & 1)) |
((fcf->ie_list_present & 1)) << 1 |
((fcf->dest_addr_mode & 3) << 2) |
((fcf->frame_version & 3) << 4) |
((fcf->src_addr_mode & 3) << 6);
}
/*----------------------------------------------------------------------------*/
/**
* \brief Creates a frame for transmission over the air. This function is
@ -388,17 +402,7 @@ frame802154_create(frame802154_t *p, uint8_t *buf)
/* OK, now we have field lengths. Time to actually construct */
/* the outgoing frame, and store it in buf */
buf[0] = (p->fcf.frame_type & 7) |
((p->fcf.security_enabled & 1) << 3) |
((p->fcf.frame_pending & 1) << 4) |
((p->fcf.ack_required & 1) << 5) |
((p->fcf.panid_compression & 1) << 6);
buf[1] = ((p->fcf.sequence_number_suppression & 1)) |
((p->fcf.ie_list_present & 1)) << 1 |
((p->fcf.dest_addr_mode & 3) << 2) |
((p->fcf.frame_version & 3) << 4) |
((p->fcf.src_addr_mode & 3) << 6);
frame802154_create_fcf(&p->fcf, buf);
pos = 2;
/* Sequence number */
@ -460,6 +464,28 @@ frame802154_create(frame802154_t *p, uint8_t *buf)
return (int)pos;
}
void
frame802154_parse_fcf(uint8_t *data, frame802154_fcf_t *pfcf)
{
frame802154_fcf_t fcf;
/* decode the FCF */
fcf.frame_type = data[0] & 7;
fcf.security_enabled = (data[0] >> 3) & 1;
fcf.frame_pending = (data[0] >> 4) & 1;
fcf.ack_required = (data[0] >> 5) & 1;
fcf.panid_compression = (data[0] >> 6) & 1;
fcf.sequence_number_suppression = data[1] & 1;
fcf.ie_list_present = (data[1] >> 1) & 1;
fcf.dest_addr_mode = (data[1] >> 2) & 3;
fcf.frame_version = (data[1] >> 4) & 3;
fcf.src_addr_mode = (data[1] >> 6) & 3;
/* copy fcf */
memcpy(pfcf, &fcf, sizeof(frame802154_fcf_t));
}
/*----------------------------------------------------------------------------*/
/**
* \brief Parses an input frame. Scans the input frame to find each
@ -489,19 +515,7 @@ frame802154_parse(uint8_t *data, int len, frame802154_t *pf)
p = data;
/* decode the FCF */
fcf.frame_type = p[0] & 7;
fcf.security_enabled = (p[0] >> 3) & 1;
fcf.frame_pending = (p[0] >> 4) & 1;
fcf.ack_required = (p[0] >> 5) & 1;
fcf.panid_compression = (p[0] >> 6) & 1;
fcf.sequence_number_suppression = p[1] & 1;
fcf.ie_list_present = (p[1] >> 1) & 1;
fcf.dest_addr_mode = (p[1] >> 2) & 3;
fcf.frame_version = (p[1] >> 4) & 3;
fcf.src_addr_mode = (p[1] >> 6) & 3;
/* copy fcf and seqNum */
frame802154_parse_fcf(p, &fcf);
memcpy(&pf->fcf, &fcf, sizeof(frame802154_fcf_t));
p += 2; /* Skip first two bytes */

2
core/net/mac/frame802154.h
View file

@ -207,8 +207,10 @@ typedef struct {
/* Prototypes */
int frame802154_hdrlen(frame802154_t *p);
void frame802154_create_fcf(frame802154_fcf_t *fcf, uint8_t *buf);
int frame802154_create(frame802154_t *p, uint8_t *buf);
int frame802154_parse(uint8_t *data, int length, frame802154_t *pf);
void frame802154_parse_fcf(uint8_t *data, frame802154_fcf_t *pfcf);
/* Get current PAN ID */
uint16_t frame802154_get_pan_id(void);