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Abtin Keshavarzian
d1147d62b9
This commit introduces a new mechanism for the TREL link to detect and handle discrepancies between the IPv6 address and port used by a TREL peer in a received TREL packet, and the information previously reported by the platform layer (through DNS-SD discovery) for the same peer. Ideally, the platform underlying DNS-SD should detect changes to advertised ports and addresses by peers. However, there are situations where this is not detected reliably. As a received frame over the TREL radio link is processed by the MAC or MLE layers, if the frame passes receive security checks at either layer (indicating it is a secure and authenticated/fresh frame from a valid neighbor), the TREL peer socket address is automatically updated from the received TREL packet info. This ensures the TREL peer table is updated correctly if there are changes to TREL peer addresses of valid Thread neighbors upon rx from such neighbor, increasing the robustness of the TREL link. This commit also introduces a new `otPlatTrel` platform API, `otPlatTrelNotifyPeerSocketAddressDifference()`. The TREL implementation now notifies the platform layer whenever it detects a discrepancy in a TREL peer's socket address, regardless of whether the peer table is automatically updated. This allows the platform layer to take any appropriate action, such as restarting or confirming DNS-SD service resolution query for the peer service instance and/or address resolution query for its associated host name. This commit also adds a new test that validates the newly added behavior, including the auto-update of peer table information and notification of the platform through the new API, triggered by either MLE or MAC messages over the TREL radio link.