diff options
| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2007-03-20 18:27:17 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-26 05:27:02 (GMT) |
| commit | 89560b53b92a07c529e13a462aa7fd87a844f1f5 (patch) | |
| tree | 89409bee68da1ee44b7945315efecd779d7fe60a | |
| parent | 7dfee1a9c07f80a82aa5fbad340146f2b5c794b4 (diff) | |
| download | linux-89560b53b92a07c529e13a462aa7fd87a844f1f5.tar.xz | |
[DCCP]: Sample RTT from SYN exchange
Function:
| -rw-r--r-- | include/linux/dccp.h | 2 | ||||
| -rw-r--r-- | net/dccp/input.c | 8 | ||||
| -rw-r--r-- | net/dccp/options.c | 8 |
3 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/dccp.h b/include/linux/dccp.h index fdd4217..e668cf5 100644 --- a/include/linux/dccp.h +++ b/include/linux/dccp.h @@ -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; diff --git a/net/dccp/input.c b/net/dccp/input.c index bd578c8..da6ec18 100644 --- a/net/dccp/input.c +++ b/net/dccp/input.c @@ -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, diff --git a/net/dccp/options.c b/net/dccp/options.c index 9074ca7..14b6212 100644 --- a/net/dccp/options.c +++ b/net/dccp/options.c @@ -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) { |