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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2008-11-12 00:42:58 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-12 00:42:58 -0800
commitf74e91b6cca5889e667193c7e794186db73c2000 (patch)
tree10f6a612d97b3ab5ba4ecd75b6decb669f178d76 /net/dccp/timer.c
parentnet: remove struct dst_entry::entry_size (diff)
downloadlinux-dev-f74e91b6cca5889e667193c7e794186db73c2000.tar.xz
linux-dev-f74e91b6cca5889e667193c7e794186db73c2000.zip
dccp: Limit feature negotiation to connection setup phase
This patch limits feature (capability) negotation to the connection setup phase: 1. Although it is theoretically possible to perform feature negotiation at any time (and RFC 4340 supports this), in practice this is prohibitively complex, as it requires to put traffic on hold for each new negotiation. 2. As a byproduct of restricting feature negotiation to connection setup, the feature-negotiation retransmit timer is no longer required. This part is now mapped onto the protocol-level retransmission. Details indicating why timers are no longer needed can be found on http://www.erg.abdn.ac.uk/users/gerrit/dccp/notes/feature_negotiation/\ implementation_notes.html This patch disables anytime negotiation, subsequent patches work out full feature negotiation support for connection setup. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/timer.c')
-rw-r--r--net/dccp/timer.c12
1 files changed, 0 insertions, 12 deletions
diff --git a/net/dccp/timer.c b/net/dccp/timer.c
index 54b3c7e9e016..162d1e683c39 100644
--- a/net/dccp/timer.c
+++ b/net/dccp/timer.c
@@ -87,17 +87,6 @@ static void dccp_retransmit_timer(struct sock *sk)
{
struct inet_connection_sock *icsk = inet_csk(sk);
- /* retransmit timer is used for feature negotiation throughout
- * connection. In this case, no packet is re-transmitted, but rather an
- * ack is generated and pending changes are placed into its options.
- */
- if (sk->sk_send_head == NULL) {
- dccp_pr_debug("feat negotiation retransmit timeout %p\n", sk);
- if (sk->sk_state == DCCP_OPEN)
- dccp_send_ack(sk);
- goto backoff;
- }
-
/*
* More than than 4MSL (8 minutes) has passed, a RESET(aborted) was
* sent, no need to retransmit, this sock is dead.
@@ -126,7 +115,6 @@ static void dccp_retransmit_timer(struct sock *sk)
return;
}
-backoff:
icsk->icsk_backoff++;
icsk->icsk_rto = min(icsk->icsk_rto << 1, DCCP_RTO_MAX);