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mesh/transport: Reformat SeqAuth calculation fix

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This commit is contained in:
Michał Narajowski
2019-01-31 17:50:26 +01:00
parent 3b3b92bfbd
commit 8799108df8
1 changed files with 11 additions and 9 deletions
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nimble/host/mesh/src/transport.c
+11 -9
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@@ -1189,20 +1189,22 @@ static int trans_seg(struct os_mbuf *buf, struct bt_mesh_net_rx *net_rx,
}
/* According to Mesh 1.0 specification:
* "The SeqAuth is composed of the IV Index and the sequence number (SEQ)
* of the first segment "
* "The SeqAuth is composed of the IV Index and the sequence number
* (SEQ) of the first segment"
*
* Therefore we need to calculate very first SEQ in order to find seqAuth.
* We can calculate as below:
* Therefore we need to calculate very first SEQ in order to find
* seqAuth. We can calculate as below:
*
* SEQ(0) = SEQ(n) - (delta between seqZero and SEQ(n) by looking into
* 14 least significant bits of SEQ(n))
* SEQ(0) = SEQ(n) - (delta between seqZero and SEQ(n) by looking into
* 14 least significant bits of SEQ(n))
*
* Mentioned delta shall be >= 0, if it is not then seq_auth will
* be broken and it will be verified by the code below.
* Mentioned delta shall be >= 0, if it is not then seq_auth will
* be broken and it will be verified by the code below.
*/
*seq_auth = SEQ_AUTH(BT_MESH_NET_IVI_RX(net_rx),
(net_rx->seq - ((((net_rx->seq & BIT_MASK(14)) - seq_zero)) & BIT_MASK(13))));
(net_rx->seq -
((((net_rx->seq & BIT_MASK(14)) - seq_zero)) &
BIT_MASK(13))));
/* Look for old RX sessions */
rx = seg_rx_find(net_rx, seq_auth);