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framer-802154: Support for creating and parsing frames with security headers

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This commit is contained in:
kkrentz 2013-05-24 04:40:01 -07:00
parent be22883724
commit 19c9ef0a95
4 changed files with 42 additions and 9 deletions
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22
core/net/mac/frame802154.c
View file

@ -122,7 +122,8 @@ field_len(frame802154_t *p, field_length_t *flen)
/* Aux security header */
if(p->fcf.security_enabled & 1) {
/* TODO Aux security header not yet implemented */
flen->aux_sec_len = 5;
/* TODO Support key identifier mode !=0 */
#if 0
switch(p->aux_hdr.security_control.key_id_mode) {
case 0:
@ -232,8 +233,10 @@ frame802154_create(frame802154_t *p, uint8_t *buf, int buf_len)
/* Aux header */
if(flen.aux_sec_len) {
/* TODO Aux security header not yet implemented */
/* pos += flen.aux_sec_len; */
/* TODO Support key identifier mode !=0 */
tx_frame_buffer[pos++] = p->aux_hdr.security_control.security_level;
memcpy(tx_frame_buffer + pos, p->aux_hdr.frame_counter.u8, 4);
pos += 4;
}
return (int)pos;
@ -338,8 +341,17 @@ frame802154_parse(uint8_t *data, int len, frame802154_t *pf)
}
if(fcf.security_enabled) {
/* TODO aux security header, not yet implemented */
/* return 0; */
pf->aux_hdr.security_control.security_level = p[0] & 7;
pf->aux_hdr.security_control.key_id_mode = (p[0] >> 3) & 3;
p += 1;
memcpy(pf->aux_hdr.frame_counter.u8, p, 4);
p += 4;
if(pf->aux_hdr.security_control.key_id_mode) {
/* TODO Support key identifier mode !=0 */
return 0;
}
}
/* header length */

8
core/net/mac/frame802154.h
View file

@ -140,10 +140,16 @@ typedef struct {
uint8_t reserved; /**< 3 bit. Reserved bits */
} frame802154_scf_t;
typedef union {
uint32_t u32;
uint16_t u16[2];
uint8_t u8[4];
} frame802154_frame_counter_t;
/** \brief 802.15.4 Aux security header */
typedef struct {
frame802154_scf_t security_control; /**< Security control bitfield */
uint32_t frame_counter; /**< Frame counter, used for security */
frame802154_frame_counter_t frame_counter; /**< Frame counter, used for security */
uint8_t key[9]; /**< The key itself, or an index to the key */
} frame802154_aux_hdr_t;

18
core/net/mac/framer-802154.c
View file

@ -102,7 +102,9 @@ create_frame(int type, int do_create)
/* Build the FCF. */
params.fcf.frame_type = FRAME802154_DATAFRAME;
params.fcf.security_enabled = 0;
if(packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL)) {
params.fcf.security_enabled = 1;
}
params.fcf.frame_pending = packetbuf_attr(PACKETBUF_ATTR_PENDING);
if(linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &linkaddr_null)) {
params.fcf.ack_required = 0;
@ -111,8 +113,13 @@ create_frame(int type, int do_create)
}
params.fcf.panid_compression = 0;
/* Insert IEEE 802.15.4 (2003) version bit. */
params.fcf.frame_version = FRAME802154_IEEE802154_2003;
/* Insert IEEE 802.15.4 (2006) version bits. */
params.fcf.frame_version = FRAME802154_IEEE802154_2006;
/* Setting security-related attributes */
params.aux_hdr.security_control.security_level = packetbuf_attr(PACKETBUF_ATTR_SECURITY_LEVEL);
params.aux_hdr.frame_counter.u16[0] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1);
params.aux_hdr.frame_counter.u16[1] = packetbuf_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3);
/* Increment and set the data sequence number. */
if(!do_create) {
@ -227,6 +234,11 @@ parse(void)
packetbuf_set_attr(PACKETBUF_ATTR_PENDING, frame.fcf.frame_pending);
/* packetbuf_set_attr(PACKETBUF_ATTR_RELIABLE, frame.fcf.ack_required);*/
packetbuf_set_attr(PACKETBUF_ATTR_PACKET_ID, frame.seq);
/* Setting security-related attributes */
packetbuf_set_attr(PACKETBUF_ATTR_SECURITY_LEVEL, frame.aux_hdr.security_control.security_level);
packetbuf_set_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1, frame.aux_hdr.frame_counter.u16[0]);
packetbuf_set_attr(PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3, frame.aux_hdr.frame_counter.u16[1]);
PRINTF("15.4-IN: %2X", frame.fcf.frame_type);
PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));

3
core/net/packetbuf.h
View file

@ -356,6 +356,9 @@ enum {
PACKETBUF_ATTR_MAX_REXMIT,
PACKETBUF_ATTR_NUM_REXMIT,
PACKETBUF_ATTR_PENDING,
PACKETBUF_ATTR_SECURITY_LEVEL,
PACKETBUF_ATTR_FRAME_COUNTER_BYTES_0_1,
PACKETBUF_ATTR_FRAME_COUNTER_BYTES_2_3,
/* Scope 2 attributes: used between end-to-end nodes. */
PACKETBUF_ATTR_HOPS,