diff options
| author | Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com> | 2026-01-31 23:25:11 +0100 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2026-02-03 15:13:25 +0100 |
| commit | 2ed661248e2b920f53db61ddfc74bc68ed10c83d (patch) | |
| tree | af142ddd6bdb1e66aeca0da20863f37bdbb78757 /include/net | |
| parent | 4024081feb87fb11ac7bd36d8c397ccdd81ed302 (diff) | |
tcp: accecn: fallback outgoing half link to non-AccECN
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>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/tcp_ecn.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/net/tcp_ecn.h b/include/net/tcp_ecn.h index 796c613b5ef3..49e0b865fe02 100644 --- a/include/net/tcp_ecn.h +++ b/include/net/tcp_ecn.h @@ -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: |