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Index: head/sys/netinet/tcp_input.c
===================================================================
--- head/sys/netinet/tcp_input.c
+++ head/sys/netinet/tcp_input.c
@@ -1545,8 +1545,10 @@
* TCP ECN processing.
*/
if (tp->t_flags2 & TF2_ECN_PERMIT) {
- if (thflags & TH_CWR)
+ if (thflags & TH_CWR) {
tp->t_flags2 &= ~TF2_ECN_SND_ECE;
+ tp->t_flags |= TF_ACKNOW;
+ }
switch (iptos & IPTOS_ECN_MASK) {
case IPTOS_ECN_CE:
tp->t_flags2 |= TF2_ECN_SND_ECE;
Index: head/sys/netinet/tcp_stacks/rack.c
===================================================================
--- head/sys/netinet/tcp_stacks/rack.c
+++ head/sys/netinet/tcp_stacks/rack.c
@@ -7701,8 +7701,10 @@
* this to occur after we've validated the segment.
*/
if (tp->t_flags2 & TF2_ECN_PERMIT) {
- if (thflags & TH_CWR)
+ if (thflags & TH_CWR) {
tp->t_flags2 &= ~TF2_ECN_SND_ECE;
+ tp->t_flags |= TF_ACKNOW;
+ }
switch (iptos & IPTOS_ECN_MASK) {
case IPTOS_ECN_CE:
tp->t_flags2 |= TF2_ECN_SND_ECE;

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