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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 /net/core
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 'net/core')
-rw-r--r--net/core/dev.c2
-rw-r--r--net/core/skbuff.c6
2 files changed, 5 insertions, 3 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index d9ce02e95992..6df3f1bcdc68 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4084,7 +4084,7 @@ static int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev)
skb_reset_mac_header(skb);
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
- __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);
+ __skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SCHED);
/* Disable soft irqs for various locks below. Also
* stops preemption for RCU.
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 145503d3f06b..2af12f7e170c 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4721,6 +4721,7 @@ err:
EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
void __skb_tstamp_tx(struct sk_buff *orig_skb,
+ const struct sk_buff *ack_skb,
struct skb_shared_hwtstamps *hwtstamps,
struct sock *sk, int tstype)
{
@@ -4743,7 +4744,8 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS) &&
sk->sk_protocol == IPPROTO_TCP &&
sk->sk_type == SOCK_STREAM) {
- skb = tcp_get_timestamping_opt_stats(sk, orig_skb);
+ skb = tcp_get_timestamping_opt_stats(sk, orig_skb,
+ ack_skb);
opt_stats = true;
} else
#endif
@@ -4772,7 +4774,7 @@ EXPORT_SYMBOL_GPL(__skb_tstamp_tx);
void skb_tstamp_tx(struct sk_buff *orig_skb,
struct skb_shared_hwtstamps *hwtstamps)
{
- return __skb_tstamp_tx(orig_skb, hwtstamps, orig_skb->sk,
+ return __skb_tstamp_tx(orig_skb, NULL, hwtstamps, orig_skb->sk,
SCM_TSTAMP_SND);
}
EXPORT_SYMBOL_GPL(skb_tstamp_tx);