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mesh: reconstruct SeqAuth from network seq and seq_zero

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This commit is contained in:
Matthias Ringwald 2019-04-03 15:36:13 +02:00
parent 257edf9b97
commit f3f54aca9a
2 changed files with 14 additions and 4 deletions
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2
test/mesh/mesh_peer.h
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@ -51,6 +51,8 @@ typedef struct {
mesh_transport_pdu_t * transport_pdu;
// seq_zero
uint16_t seq_zero;
// seq_auth
uint32_t seq_auth;
// block ack
uint32_t block_ack;
} mesh_peer_t;

16
test/mesh/mesh_transport.c
View File

@ -662,7 +662,7 @@ static void mesh_transport_stop_incomplete_timer(mesh_transport_pdu_t * transpor
// stops timers and updates reassembly engine
static void mesh_transport_segmented_message_complete(mesh_transport_pdu_t * transport_pdu){
/// set flag
// set flag
transport_pdu->message_complete = 1;
// stop timers
mesh_transport_stop_acknowledgment_timer(transport_pdu);
@ -752,15 +752,22 @@ static mesh_transport_pdu_t * mesh_transport_pdu_for_segmented_message(mesh_netw
return NULL;
}
// reconstruct lowest 24 bit of SeqAuth
uint32_t seq = mesh_network_seq(network_pdu);
uint32_t seq_auth = (seq & 0xffe000) | seq_zero;
if (seq_auth > seq){
seq_auth -= 0x2000;
}
// no transport pdu active, check if seq zero is new
if (seq_zero > peer->seq_zero){
if (seq_auth > peer->seq_auth){
mesh_transport_pdu_t * pdu = btstack_memory_mesh_transport_pdu_get();
if (!pdu) return NULL;
// cache network pdu header
memcpy(pdu->network_header, network_pdu->data, 9);
// store lower 24 bit of SeqAuth for App / Device Nonce (by storing 16-bit seq_zero in seq)
big_endian_store_16(pdu->network_header, 3, seq_zero);
// store lower 24 bit of SeqAuth for App / Device Nonce
big_endian_store_24(pdu->network_header, 2, seq_auth);
// store meta data in new pdu
pdu->netkey_index = network_pdu->netkey_index;
@ -772,6 +779,7 @@ static mesh_transport_pdu_t * mesh_transport_pdu_for_segmented_message(mesh_netw
// update peer info
peer->transport_pdu = pdu;
peer->seq_zero = seq_zero;
peer->seq_auth = seq_auth;
peer->block_ack = 0;
printf("mesh_transport_pdu_for_segmented_message: setup transport pdu %p for src %x, seq %06x, seq_zero %x\n", pdu, src, mesh_transport_seq(pdu), seq_zero);