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Index: head/sys/netinet/tcp_input.c
===================================================================
--- head/sys/netinet/tcp_input.c
+++ head/sys/netinet/tcp_input.c
@@ -2010,7 +2010,8 @@
else
tp->t_flags |= TF_ACKNOW;
- if ((thflags & TH_ECE) && V_tcp_do_ecn) {
+ if (((thflags & (TH_CWR | TH_ECE)) == TH_ECE) &&
+ V_tcp_do_ecn) {
tp->t_flags |= TF_ECN_PERMIT;
TCPSTAT_INC(tcps_ecn_shs);
}
Index: head/sys/netinet/tcp_stacks/rack.c
===================================================================
--- head/sys/netinet/tcp_stacks/rack.c
+++ head/sys/netinet/tcp_stacks/rack.c
@@ -5233,7 +5233,8 @@
tp->t_flags |= TF_ACKNOW;
}
- if ((thflags & TH_ECE) && V_tcp_do_ecn) {
+ if (((thflags & (TH_CWR | TH_ECE)) == TH_ECE) &&
+ V_tcp_do_ecn) {
tp->t_flags |= TF_ECN_PERMIT;
TCPSTAT_INC(tcps_ecn_shs);
}

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