wifi: Add function to retrieve whether a GCR BAR shall be retransmitted

src/wifi/model/block-ack-manager.cc

@@ -1156,6 +1156,15 @@ BlockAckManager::NeedBarRetransmission(uint8_t tid, const Mac48Address& recipien
     return false;
 }
 
+bool
+BlockAckManager::NeedGcrBarRetransmission(const Mac48Address& gcrGroupAddress,
+                                          const Mac48Address& recipient,
+                                          uint8_t tid) const
+{
+    const auto it = GetOriginatorBaAgreement(recipient, tid, gcrGroupAddress);
+    return (it != m_originatorAgreements.cend() && it->second.first.IsEstablished());
+}
+
 void
 BlockAckManager::SetBlockAckInactivityCallback(
     Callback<void, Mac48Address, uint8_t, bool, std::optional<Mac48Address>> callback)

src/wifi/model/block-ack-manager.h

@@ -359,6 +359,22 @@ class BlockAckManager : public Object
      * @returns true if BAR retransmission needed
      */
     bool NeedBarRetransmission(uint8_t tid, const Mac48Address& recipient);
+
+    /**
+     * This function returns true if a GCR block ack agreement is established with the given
+     * recipient, for the given TID, for the given GCR group address and there is at least an
+     * outstanding MPDU for such agreement whose lifetime is not expired.
+     *
+     * @param gcrGroupAddress the GCR group address
+     * @param tid Traffic ID
+     * @param recipient MAC address of the recipient
+     *
+     * @returns true if BAR retransmission needed
+     */
+    bool NeedGcrBarRetransmission(const Mac48Address& gcrGroupAddress,
+                                  const Mac48Address& recipient,
+                                  uint8_t tid) const;
+
     /**
      * This function returns the buffer size negotiated with the recipient.
      *