On Wed, 2018-01-17 at 15:06 -0800, Jesus Sanchez-Palencia wrote: > From: Richard Cochran <rcoch...@linutronix.de> > > For raw packets, copy the desired future transmit time from the CMSG > cookie into the skb. > > Signed-off-by: Richard Cochran <rcoch...@linutronix.de> > Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palen...@intel.com> > --- > net/ipv4/raw.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c > index 136544b36a46..e37ea8ab6a78 100644 > --- a/net/ipv4/raw.c > +++ b/net/ipv4/raw.c > @@ -381,6 +381,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 > *fl4, > > skb->priority = sk->sk_priority; > skb->mark = sk->sk_mark; > + skb->tstamp = sockc->transmit_time; > skb_dst_set(skb, &rt->dst); > *rtp = NULL; > > @@ -562,6 +563,7 @@ static int raw_sendmsg(struct sock *sk, struct msghdr > *msg, size_t len) > } > > ipc.sockc.tsflags = sk->sk_tsflags; > + ipc.sockc.transmit_time = 0; > ipc.addr = inet->inet_saddr; > ipc.opt = NULL; > ipc.tx_flags = 0;
It seems that skb_scrub_packet() will clear skb->tstamp, meaning that going through a tunnel will break your feature. Maybe we need to remove skb->tstamp clear from skb_scrub_packet() and do the cleaning only in forwarding path.
