Commit 89560b53 authored by Gerrit Renker's avatar Gerrit Renker Committed by David S. Miller
Browse files

[DCCP]: Sample RTT from SYN exchange 

Function:
parent 7dfee1a9

include/linux/dccp.h

+2 −0
Original line number Diff line number Diff line
@@ -481,10 +481,12 @@ struct dccp_ackvec; 
 * @dccps_hc_rx_insert_options -

 * @dccps_hc_tx_insert_options -

 * @dccps_xmit_timer - timer for when CCID is not ready to send

 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)

 */

struct dccp_sock {

	/* inet_connection_sock has to be the first member of dccp_sock */

	struct inet_connection_sock	dccps_inet_connection;

#define dccps_syn_rtt			dccps_inet_connection.icsk_ack.lrcvtime

	__u64				dccps_swl;

	__u64				dccps_swh;

	__u64				dccps_awl;

net/dccp/input.c

+8 −0
Original line number Diff line number Diff line
@@ -300,6 +300,14 @@ static int dccp_rcv_request_sent_state_process(struct sock *sk, 
		if (dccp_parse_options(sk, skb))

			goto out_invalid_packet;



		/* Obtain RTT sample from SYN exchange (used by CCID 3) */

		if (dp->dccps_options_received.dccpor_timestamp_echo) {

			struct timeval now;



			dccp_timestamp(sk, &now);

			dp->dccps_syn_rtt = dccp_sample_rtt(sk, &now, NULL);

		}



		if (dccp_msk(sk)->dccpms_send_ack_vector &&

		    dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,

				    DCCP_SKB_CB(skb)->dccpd_seq,

net/dccp/options.c

+8 −0
Original line number Diff line number Diff line
@@ -563,6 +563,14 @@ int dccp_insert_options(struct sock *sk, struct sk_buff *skb) 
	    dccp_insert_options_feat(sk, skb))

		return -1;



	/*

	 * Obtain RTT sample from Request/Response exchange.

	 * This is currently used in CCID 3 initialisation.

	 */

	if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST &&

	    dccp_insert_option_timestamp(sk, skb))

		return -1;



	/* XXX: insert other options when appropriate */



	if (DCCP_SKB_CB(skb)->dccpd_opt_len != 0) {