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authorYousuk Seung <ysseung@google.com>2021-01-20 12:41:55 -0800
committerJakub Kicinski <kuba@kernel.org>2021-01-22 18:20:52 -0800
commite7ed11ee945438b737e2ae2370e35591e16ec371 (patch)
tree46fff7a6dfc03c64cd6921452d84c0eba20e9609 /include/uapi/linux/tcp.h
parenta05a7280f5453ed24c2001eb66b359776ab18cb5 (diff)
tcp: add TTL to SCM_TIMESTAMPING_OPT_STATS
This patch adds TCP_NLA_TTL to SCM_TIMESTAMPING_OPT_STATS that exports the time-to-live or hop limit of the latest incoming packet with SCM_TSTAMP_ACK. The value exported may not be from the packet that acks the sequence when incoming packets are aggregated. Exporting the time-to-live or hop limit value of incoming packets helps to estimate the hop count of the path of the flow that may change over time. Signed-off-by: Yousuk Seung <ysseung@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Link: https://lore.kernel.org/r/20210120204155.552275-1-ysseung@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/uapi/linux/tcp.h')
-rw-r--r--include/uapi/linux/tcp.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index 768e93bd5b51..16dfa40bdac3 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -314,6 +314,7 @@ enum {
TCP_NLA_TIMEOUT_REHASH, /* Timeout-triggered rehash attempts */
TCP_NLA_BYTES_NOTSENT, /* Bytes in write queue not yet sent */
TCP_NLA_EDT, /* Earliest departure time (CLOCK_MONOTONIC) */
+ TCP_NLA_TTL, /* TTL or hop limit of a packet received */
};
/* for TCP_MD5SIG socket option */