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D23373.1784990080.diff
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D23373.1784990080.diff
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Index: head/sys/netinet/tcp_input.c
===================================================================
--- head/sys/netinet/tcp_input.c
+++ head/sys/netinet/tcp_input.c
@@ -1611,6 +1611,14 @@
* XXX this is traditional behavior, may need to be cleaned up.
*/
if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {
+ /* Handle parallel SYN for ECN */
+ if (!(thflags & TH_ACK) &&
+ ((thflags & (TH_CWR | TH_ECE)) == (TH_CWR | TH_ECE)) &&
+ ((V_tcp_do_ecn == 1) || (V_tcp_do_ecn == 2))) {
+ tp->t_flags2 |= TF2_ECN_PERMIT;
+ tp->t_flags2 |= TF2_ECN_SND_ECE;
+ TCPSTAT_INC(tcps_ecn_shs);
+ }
if ((to.to_flags & TOF_SCALE) &&
(tp->t_flags & TF_REQ_SCALE)) {
tp->t_flags |= TF_RCVD_SCALE;
Index: head/sys/netinet/tcp_output.c
===================================================================
--- head/sys/netinet/tcp_output.c
+++ head/sys/netinet/tcp_output.c
@@ -1154,6 +1154,12 @@
} else
flags |= TH_ECE|TH_CWR;
}
+ /* Handle parallel SYN for ECN */
+ if ((tp->t_state == TCPS_SYN_RECEIVED) &&
+ (tp->t_flags2 & TF2_ECN_SND_ECE)) {
+ flags |= TH_ECE;
+ tp->t_flags2 &= ~TF2_ECN_SND_ECE;
+ }
if (tp->t_state == TCPS_ESTABLISHED &&
(tp->t_flags2 & TF2_ECN_PERMIT)) {
Index: head/sys/netinet/tcp_stacks/rack.c
===================================================================
--- head/sys/netinet/tcp_stacks/rack.c
+++ head/sys/netinet/tcp_stacks/rack.c
@@ -11070,6 +11070,14 @@
* this is traditional behavior, may need to be cleaned up.
*/
if (tp->t_state == TCPS_SYN_SENT && (thflags & TH_SYN)) {
+ /* Handle parallel SYN for ECN */
+ if (!(thflags & TH_ACK) &&
+ ((thflags & (TH_CWR | TH_ECE)) == (TH_CWR | TH_ECE)) &&
+ ((V_tcp_do_ecn == 1) || (V_tcp_do_ecn == 2))) {
+ tp->t_flags2 |= TF2_ECN_PERMIT;
+ tp->t_flags2 |= TF2_ECN_SND_ECE;
+ TCPSTAT_INC(tcps_ecn_shs);
+ }
if ((to.to_flags & TOF_SCALE) &&
(tp->t_flags & TF_REQ_SCALE)) {
tp->t_flags |= TF_RCVD_SCALE;
@@ -13522,6 +13530,12 @@
flags |= TH_ECE | TH_CWR;
} else
flags |= TH_ECE | TH_CWR;
+ }
+ /* Handle parallel SYN for ECN */
+ if ((tp->t_state == TCPS_SYN_RECEIVED) &&
+ (tp->t_flags2 & TF2_ECN_SND_ECE)) {
+ flags |= TH_ECE;
+ tp->t_flags2 &= ~TF2_ECN_SND_ECE;
}
if (tp->t_state == TCPS_ESTABLISHED &&
(tp->t_flags2 & TF2_ECN_PERMIT)) {

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