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| author | Yousuk Seung <ysseung@google.com> | 2021-01-20 12:41:55 -0800 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2021-01-22 18:20:52 -0800 |
| commit | e7ed11ee945438b737e2ae2370e35591e16ec371 (patch) | |
| tree | 46fff7a6dfc03c64cd6921452d84c0eba20e9609 /include/linux/tcp.h | |
| parent | a05a7280f5453ed24c2001eb66b359776ab18cb5 (diff) | |
| download | linux-e7ed11ee945438b737e2ae2370e35591e16ec371.tar.gz linux-e7ed11ee945438b737e2ae2370e35591e16ec371.tar.bz2 linux-e7ed11ee945438b737e2ae2370e35591e16ec371.zip | |
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/linux/tcp.h')
| -rw-r--r-- | include/linux/tcp.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 2f87377e9af7..48d8a363319e 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -496,7 +496,8 @@ static inline u32 tcp_saved_syn_len(const struct saved_syn *saved_syn) } struct sk_buff *tcp_get_timestamping_opt_stats(const struct sock *sk, - const struct sk_buff *orig_skb); + const struct sk_buff *orig_skb, + const struct sk_buff *ack_skb); static inline u16 tcp_mss_clamp(const struct tcp_sock *tp, u16 mss) { |