diff options
| author | Jakub Kicinski <kuba@kernel.org> | 2025-04-24 18:21:07 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2025-04-24 18:21:07 -0700 |
| commit | a764e8114d2d80e8b0f453084b2e9fcc6454b7a1 (patch) | |
| tree | 56b3c3d26b4e65bbe2ab42f02a6b71c632818cbb /include/uapi/linux | |
| parent | 4134bb726efdc7a4a64bd0f776359cb0564564b2 (diff) | |
| parent | 2b13042d3636327eb50c8a0ee06f629d52d1b8fb (diff) | |
Merge branch 'tcp-fastopen-observability'
Jeremy Harris says:
====================
tcp: fastopen: observability
Whether TCP Fast Open was used for a connection is not reliably
observable by an accepting application when the SYN passed no data.
Fix this by noting during SYN receive processing that an acceptable Fast
Open option was used, and provide this to userland via getsockopt TCP_INFO.
====================
Link: https://patch.msgid.link/20250423124334.4916-1-jgh@exim.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/tcp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index dc8fdc80e16b..bdac8c42fa82 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -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 |