+ struct rxrpc_ack_summary summary = { 0 };
+ struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
+ union {
+ struct rxrpc_ackpacket ack;
+ struct rxrpc_ackinfo info;
+ u8 acks[RXRPC_MAXACKS];
+ } buf;
+ rxrpc_serial_t acked_serial;
+ rxrpc_seq_t first_soft_ack, hard_ack;
+ int nr_acks, offset, ioffset;
+
+ _enter("");
+
+ offset = sizeof(struct rxrpc_wire_header);
+ if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) {
+ _debug("extraction failure");
+ return rxrpc_proto_abort("XAK", call, 0);
+ }
+ offset += sizeof(buf.ack);
+
+ acked_serial = ntohl(buf.ack.serial);
+ first_soft_ack = ntohl(buf.ack.firstPacket);
+ hard_ack = first_soft_ack - 1;
+ nr_acks = buf.ack.nAcks;
+ summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ?
+ buf.ack.reason : RXRPC_ACK__INVALID);
+
+ trace_rxrpc_rx_ack(call, first_soft_ack, summary.ack_reason, nr_acks);
+
+ _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
+ sp->hdr.serial,
+ ntohs(buf.ack.maxSkew),
+ first_soft_ack,
+ ntohl(buf.ack.previousPacket),
+ acked_serial,
+ rxrpc_ack_names[summary.ack_reason],
+ buf.ack.nAcks);
+
+ if (buf.ack.reason == RXRPC_ACK_PING_RESPONSE)
+ rxrpc_input_ping_response(call, skb->tstamp, acked_serial,
+ sp->hdr.serial);
+ if (buf.ack.reason == RXRPC_ACK_REQUESTED)
+ rxrpc_input_requested_ack(call, skb->tstamp, acked_serial,
+ sp->hdr.serial);
+
+ if (buf.ack.reason == RXRPC_ACK_PING) {
+ _proto("Rx ACK %%%u PING Request", sp->hdr.serial);
+ rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE,
+ skew, sp->hdr.serial, true, true,
+ rxrpc_propose_ack_respond_to_ping);
+ } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) {
+ rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED,
+ skew, sp->hdr.serial, true, true,
+ rxrpc_propose_ack_respond_to_ack);
+ }