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dccp: Integrate feature-negotiation insertion code

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The patch implements insertion of feature negotiation at the server (listening
and request socket) and the client (connecting socket).

In dccp_insert_options(), several statements have been grouped together now
to achieve (it is hoped) better efficiency by reducing the number of tests
each packet has to go through:
 - Ack Vectors are sent if the packet is neither a Data or a Request packet;
 - a previous issue is corrected - feature negotiation options are allowed
   on DataAck packets (5.8).

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gerrit Renker 2008-12-01 23:29:30 -08:00 committed by David S. Miller
parent 0971d17ca3
commit 8b7b6c75c6
1 changed files with 21 additions and 12 deletions
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33
net/dccp/options.c
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@ -554,11 +554,25 @@ int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
dccp_insert_option_ndp(sk, skb))
return -1;
if (!dccp_packet_without_ack(skb)) {
if (dmsk->dccpms_send_ack_vector &&
dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
dccp_insert_option_ackvec(sk, skb))
if (DCCP_SKB_CB(skb)->dccpd_type != DCCP_PKT_DATA) {
/* Feature Negotiation */
if (dccp_feat_insert_opts(dp, NULL, skb))
return -1;
if (DCCP_SKB_CB(skb)->dccpd_type == DCCP_PKT_REQUEST) {
/*
* Obtain RTT sample from Request/Response exchange.
* This is currently used in CCID 3 initialisation.
*/
if (dccp_insert_option_timestamp(sk, skb))
return -1;
} else if (dmsk->dccpms_send_ack_vector &&
dccp_ackvec_pending(dp->dccps_hc_rx_ackvec) &&
dccp_insert_option_ackvec(sk, skb)) {
return -1;
}
}
if (dp->dccps_hc_rx_insert_options) {
@ -567,14 +581,6 @@ int dccp_insert_options(struct sock *sk, struct sk_buff *skb)
dp->dccps_hc_rx_insert_options = 0;
}
/*
* 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;
if (dp->dccps_timestamp_echo != 0 &&
dccp_insert_option_timestamp_echo(dp, NULL, skb))
return -1;
@ -587,6 +593,9 @@ int dccp_insert_options_rsk(struct dccp_request_sock *dreq, struct sk_buff *skb)
{
DCCP_SKB_CB(skb)->dccpd_opt_len = 0;
if (dccp_feat_insert_opts(NULL, dreq, skb))
return -1;
if (dreq->dreq_timestamp_echo != 0 &&
dccp_insert_option_timestamp_echo(NULL, dreq, skb))
return -1;