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authorYousuk Seung <ysseung@google.com>2021-01-20 23:41:55 +0300
committerJakub Kicinski <kuba@kernel.org>2021-01-23 05:20:52 +0300
commite7ed11ee945438b737e2ae2370e35591e16ec371 (patch)
tree46fff7a6dfc03c64cd6921452d84c0eba20e9609 /include/linux/tcp.h
parenta05a7280f5453ed24c2001eb66b359776ab18cb5 (diff)
downloadlinux-e7ed11ee945438b737e2ae2370e35591e16ec371.tar.xz
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.h3
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)
{