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tcp: fastopen: pass TFO child indication through getsockopt 

tcp: fastopen: pass TFO child indication through getsockopt

Note that this uses up the last bit of a field in struct tcp_info

Signed-off-by: Jeremy Harris <jgh@exim.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Link: https://patch.msgid.link/20250423124334.4916-3-jgh@exim.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jeremy Harris 2025-04-23 13:43:34 +01:00 committed by Jakub Kicinski
parent bc2550b4e1
commit 2b13042d36
2 changed files with 3 additions and 0 deletions
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1
include/uapi/linux/tcp.h
View File

@ -184,6 +184,7 @@ enum tcp_fastopen_client_fail {
#define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */
#define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */
#define TCPI_OPT_USEC_TS 64 /* usec timestamps */
#define TCPI_OPT_TFO_CHILD 128 /* child from a Fast Open option on SYN */
/*
* Sender's congestion state indicating normal or abnormal situations

2
net/ipv4/tcp.c
View File

@ -4165,6 +4165,8 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
info->tcpi_options |= TCPI_OPT_SYN_DATA;
if (tp->tcp_usec_ts)
info->tcpi_options |= TCPI_OPT_USEC_TS;
if (tp->syn_fastopen_child)
info->tcpi_options |= TCPI_OPT_TFO_CHILD;
info->tcpi_rto = jiffies_to_usecs(icsk->icsk_rto);
info->tcpi_ato = jiffies_to_usecs(min_t(u32, icsk->icsk_ack.ato,