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Accept RST on received packets
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94fc68895d
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@ -559,7 +559,8 @@ static int tcp_rx_data ( struct tcp_connection *conn, uint32_t seq,
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return 0;
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}
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/** Handle TCP received FIN
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/**
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* Handle TCP received FIN
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*
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* @v conn TCP connection
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* @v seq SEQ value (in host-endian order)
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@ -587,6 +588,46 @@ static int tcp_rx_fin ( struct tcp_connection *conn, uint32_t seq ) {
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return 0;
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}
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/**
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* Handle TCP received RST
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*
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* @v conn TCP connection
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* @v seq SEQ value (in host-endian order)
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* @ret rc Return status code
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*/
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static int tcp_rx_rst ( struct tcp_connection *conn, uint32_t seq ) {
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struct tcp_application *app = conn->app;
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/* Accept RST only if it falls within the window. If we have
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* not yet received a SYN, then we have no window to test
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* against, so fall back to checking that our SYN has been
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* ACKed.
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*/
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if ( conn->tcp_state & TCP_STATE_RCVD ( TCP_SYN ) ) {
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if ( ( conn->rcv_ack - seq ) > 0 )
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return 0;
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} else {
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if ( ! ( conn->tcp_state & TCP_STATE_ACKED ( TCP_SYN ) ) )
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return 0;
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}
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/* Transition to CLOSED */
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conn->tcp_state = TCP_CLOSED;
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tcp_dump_state ( conn );
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/* Break association between application and connection */
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tcp_disassociate ( conn );
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/* Free the connection */
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free_tcp ( conn );
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/* Notify application */
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if ( app && app->tcp_op->closed )
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app->tcp_op->closed ( app, -ECONNRESET );
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return -ECONNRESET;
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}
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/**
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* Process received packet
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*
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@ -668,13 +709,6 @@ static int tcp_rx ( struct pk_buff *pkb,
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goto done;
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}
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/* Handle RST, if present */
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#warning "Handle RST"
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if ( flags & TCP_RST ) {
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rc = -ECONNRESET;
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goto done;
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}
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/* Handle ACK, if present */
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if ( flags & TCP_ACK )
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tcp_rx_ack ( conn, ack, win );
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@ -685,6 +719,12 @@ static int tcp_rx ( struct pk_buff *pkb,
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seq++;
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}
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/* Handle RST, if present */
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if ( flags & TCP_RST ) {
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if ( ( rc = tcp_rx_rst ( conn, seq ) ) != 0 )
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goto done;
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}
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/* Handle new data, if any */
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tcp_rx_data ( conn, seq, data, len );
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seq += len;
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@ -695,7 +735,7 @@ static int tcp_rx ( struct pk_buff *pkb,
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seq++;
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}
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/* Dump out any state change as a result of SYN, FIN or ACK */
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/* Dump out any state change as a result of the received packet */
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tcp_dump_state ( conn );
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/* Send out any pending data. If peer is expecting an ACK for
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