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tcp: add TTL to SCM_TIMESTAMPING_OPT_STATS

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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>
This commit is contained in:
Yousuk Seung 2021-01-20 12:41:55 -08:00 • committed by Jakub Kicinski
parent a05a7280f5
commit e7ed11ee94
7 changed files with 34 additions and 14 deletions
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1
include/uapi/linux/tcp.h
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@ -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 */