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tcp: fix initial tp->rcvq_space.space value for passive TS enabled flows

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[ Upstream commit cd171461b90a2d2cf230943df60d580174633718 ]

tcp_rcv_state_process() must tweak tp->advmss for TS enabled flows
before the call to tcp_init_transfer() / tcp_init_buffer_space().

Otherwise tp->rcvq_space.space is off by 120 bytes
(TCP_INIT_CWND * TCPOLEN_TSTAMP_ALIGNED).

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Wei Wang <weiwan@google.com>
Link: https://patch.msgid.link/20250513193919.1089692-7-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Dumazet
2025-05-13 19:39:14 +00:00
committed by Greg Kroah-Hartman
parent 156b6bac76
commit c1025a5428
1 changed files with 3 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/ipv4/tcp_input.c
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@@ -6699,6 +6699,9 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
if (!tp->srtt_us) if (!tp->srtt_us)
tcp_synack_rtt_meas(sk, req); tcp_synack_rtt_meas(sk, req);
if (tp->rx_opt.tstamp_ok)
tp->advmss -= TCPOLEN_TSTAMP_ALIGNED;
if (req) { if (req) {
tcp_rcv_synrecv_state_fastopen(sk); tcp_rcv_synrecv_state_fastopen(sk);
} else { } else {
@@ -6723,9 +6726,6 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
tp->snd_wnd = ntohs(th->window) << tp->rx_opt.snd_wscale; tp->snd_wnd = ntohs(th->window) << tp->rx_opt.snd_wscale;
tcp_init_wl(tp, TCP_SKB_CB(skb)->seq); tcp_init_wl(tp, TCP_SKB_CB(skb)->seq);
if (tp->rx_opt.tstamp_ok)
tp->advmss -= TCPOLEN_TSTAMP_ALIGNED;
if (!inet_csk(sk)->icsk_ca_ops->cong_control) if (!inet_csk(sk)->icsk_ca_ops->cong_control)
tcp_update_pacing_rate(sk); tcp_update_pacing_rate(sk);