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tcp: accecn: fallback outgoing half link to non-AccECN

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According to Section 3.2.2.1 of AccECN spec (RFC9768), if the Server
is in AccECN mode and in SYN-RCVD state, and if it receives a value of
zero on a pure ACK with SYN=0 and no SACK blocks, for the rest of the
connection the Server MUST NOT set ECT on outgoing packets and MUST
NOT respond to AccECN feedback. Nonetheless, as a Data Receiver it
MUST NOT disable AccECN feedback.

Signed-off-by: Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260131222515.8485-12-chia-yu.chang@nokia-bell-labs.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Chia-Yu Chang 2026-01-31 23:25:11 +01:00 committed by Paolo Abeni
parent 4024081feb
commit 2ed661248e
1 changed files with 3 additions and 1 deletions
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4
include/net/tcp_ecn.h
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@ -175,7 +175,9 @@ static inline void tcp_accecn_third_ack(struct sock *sk,
switch (ace) {
case 0x0:
/* Invalid value */
tcp_accecn_fail_mode_set(tp, TCP_ACCECN_ACE_FAIL_RECV);
if (!TCP_SKB_CB(skb)->sacked)
tcp_accecn_fail_mode_set(tp, TCP_ACCECN_ACE_FAIL_RECV |
TCP_ACCECN_OPT_FAIL_RECV);
break;
case 0x7:
case 0x5: