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    • Gerrit Renker's avatar
      dccp ccid-2: Phase out the use of boolean Ack Vector sysctl · 6fdd34d4
      Gerrit Renker authored
      This removes the use of the sysctl and the minisock variable for the Send Ack
      Vector feature, as it now is handled fully dynamically via feature negotiation
      (i.e. when CCID-2 is enabled, Ack Vectors are automatically enabled as per
       RFC 4341, 4.).
      
      Using a sysctl in parallel to this implementation would open the door to
      crashes, since much of the code relies on tests of the boolean minisock /
      sysctl variable. Thus, this patch replaces all tests of type
      
      	if (dccp_msk(sk)->dccpms_send_ack_vector)
      		/* ... */
      with
      	if (dp->dccps_hc_rx_ackvec != NULL)
      		/* ... */
      
      The dccps_hc_rx_ackvec is allocated by the dccp_hdlr_ackvec() when feature
      negotiation concluded that Ack Vectors are to be used on the half-connection.
      Otherwise, it is NULL (due to dccp_init_sock/dccp_create_openreq_child),
      so that the test is a valid one.
      
      The activation handler for Ack Vectors is called as soon as the feature
      negotiation has concluded at the
       * server when the Ack marking the transition RESPOND => OPEN arrives;
       * client after it has sent its ACK, marking the transition REQUEST => PARTOPEN.
      
      Adding the sequence number of the Response packet to the Ack Vector has been
      removed, since
       (a) connection establishment implies that the Response has been received;
       (b) the CCIDs only look at packets received in the (PART)OPEN state, i.e.
           this entry will always be ignored;
       (c) it can not be used for anything useful - to detect loss for instance, only
           packets received after the loss can serve as pseudo-dupacks.
      
      There was a FIXME to change the error code when dccp_ackvec_add() fails.
      I removed this after finding out that:
       * the check whether ackno < ISN is already made earlier,
       * this Response is likely the 1st packet with an Ackno that the client gets,
       * so when dccp_ackvec_add() fails, the reason is likely not a packet error.
      Signed-off-by: default avatarGerrit Renker <gerrit@erg.abdn.ac.uk>
      Acked-by: default avatarIan McDonald <ian.mcdonald@jandi.co.nz>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6fdd34d4