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nimble/ll: Drop packets with empty payload for LL Control PDU

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Only continuation/empty LL Data PDU can have empty payload.

Reference: Core v5.0, Vol 6, Part B, section 2.4

X-Original-Commit: dfa5d749cc1f9573e375589abbce00a906b8b8c1
This commit is contained in:
Andrzej Kaczmarek
2017-09-26 22:37:15 +02:00
parent 76bfb6ece2
commit 1724135b91
1 changed files with 5 additions and 2 deletions
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nimble/controller/src/ble_ll_conn.c
+5 -2
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@@ -3442,9 +3442,12 @@ ble_ll_conn_rx_data_pdu(struct os_mbuf *rxpdu, struct ble_mbuf_hdr *hdr)
acl_len = rxbuf[1];
acl_hdr = hdr_byte & BLE_LL_DATA_HDR_LLID_MASK;
/* Check that the LLID is reasonable */
/*
* Check that the LLID and payload length are reasonable.
* Empty payload is only allowed for LLID == 01b.
* */
if ((acl_hdr == 0) ||
((acl_hdr == BLE_LL_LLID_DATA_START) && (acl_len == 0))) {
((acl_len == 0) && (acl_hdr != BLE_LL_LLID_DATA_FRAG))) {
STATS_INC(ble_ll_conn_stats, rx_bad_llid);
goto conn_rx_data_pdu_end;
}