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dccp: Integration of dynamic feature activation - part 3 (client side)
This integrates feature-activation in the client, with these details: 1. When dccp_parse_options() fails, the reset code is already set, request_sent _state_process() currently overrides this with `Packet Error', which is not intended - so changed to use the reset code set in dccp_parse_options(); 2. There was a FIXME to change the error code when dccp_ackvec_add() fails. I have looked this up and found 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. 3. When feature negotiation fails, the socket should be marked as not usable, so that the application is notified that an error occurs. This is achieved by a new label, which uses an error code of `Aborted' and which sets the socket state to CLOSED, as well as sk_err. 4. Avoids parsing the Ack twice in Respond state by not doing option processing again in dccp_rcv_respond_partopen_state_process (as option processing has already been done on the request_sock in dccp_check_req). Since this addresses congestion-control initialisation, a corresponding FIXME has been removed. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
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@ -421,8 +421,13 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
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goto out_invalid_packet;
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}
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/*
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* If option processing (Step 8) failed, return 1 here so that
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* dccp_v4_do_rcv() sends a Reset. The Reset code depends on
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* the option type and is set in dccp_parse_options().
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*/
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if (dccp_parse_options(sk, NULL, skb))
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goto out_invalid_packet;
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return 1;
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/* Obtain usec RTT sample from SYN exchange (used by CCID 3) */
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if (likely(dp->dccps_options_received.dccpor_timestamp_echo))
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@ -475,6 +480,15 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk,
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*/
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dccp_set_state(sk, DCCP_PARTOPEN);
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/*
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* If feature negotiation was successful, activate features now;
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* an activation failure means that this host could not activate
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* one ore more features (e.g. insufficient memory), which would
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* leave at least one feature in an undefined state.
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*/
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if (dccp_feat_activate_values(sk, &dp->dccps_featneg))
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goto unable_to_proceed;
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/* Make sure socket is routed, for correct metrics. */
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icsk->icsk_af_ops->rebuild_header(sk);
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@ -509,6 +523,16 @@ out_invalid_packet:
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/* dccp_v4_do_rcv will send a reset */
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DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_PACKET_ERROR;
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return 1;
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unable_to_proceed:
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DCCP_SKB_CB(skb)->dccpd_reset_code = DCCP_RESET_CODE_ABORTED;
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/*
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* We mark this socket as no longer usable, so that the loop in
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* dccp_sendmsg() terminates and the application gets notified.
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*/
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dccp_set_state(sk, DCCP_CLOSED);
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sk->sk_err = ECOMM;
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return 1;
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}
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static int dccp_rcv_respond_partopen_state_process(struct sock *sk,
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@ -600,7 +624,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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return 1;
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}
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if (sk->sk_state != DCCP_REQUESTING) {
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if (sk->sk_state != DCCP_REQUESTING && sk->sk_state != DCCP_RESPOND) {
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if (dccp_check_seqno(sk, skb))
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goto discard;
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@ -665,8 +689,6 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
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return 1;
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case DCCP_REQUESTING:
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/* FIXME: do congestion control initialization */
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queued = dccp_rcv_request_sent_state_process(sk, skb, dh, len);
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if (queued >= 0)
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return queued;
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