From 8672406eb5d77333ca14e9612e3166704b367c40 Mon Sep 17 00:00:00 2001 From: Martin KaFai Lau Date: Wed, 2 Mar 2022 11:55:57 -0800 Subject: net: ip: Handle delivery_time in ip defrag A latter patch will postpone the delivery_time clearing until the stack knows the skb is being delivered locally. That will allow other kernel forwarding path (e.g. ip[6]_forward) to keep the delivery_time also. An earlier attempt was to do skb_clear_delivery_time() in ip_local_deliver() and ip6_input(). The discussion [0] requested to move it one step later into ip_local_deliver_finish() and ip6_input_finish() so that the delivery_time can be kept for the ip_vs forwarding path also. To do that, this patch also needs to take care of the (rcv) timestamp usecase in ip_is_fragment(). It needs to expect delivery_time in the skb->tstamp, so it needs to save the mono_delivery_time bit in inet_frag_queue such that the delivery_time (if any) can be restored in the final defragmented skb. [Note that it will only happen when the locally generated skb is looping from egress to ingress over a virtual interface (e.g. veth, loopback...), skb->tstamp may have the delivery time before it is known that it will be delivered locally and received by another sk.] [0]: https://lore.kernel.org/netdev/ca728d81-80e8-3767-d5e-d44f6ad96e43@ssi.bg/ Signed-off-by: Martin KaFai Lau Signed-off-by: David S. Miller --- include/net/inet_frag.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/net') diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h index 63540be0fc34..911ad930867d 100644 --- a/include/net/inet_frag.h +++ b/include/net/inet_frag.h @@ -70,6 +70,7 @@ struct frag_v6_compare_key { * @stamp: timestamp of the last received fragment * @len: total length of the original datagram * @meat: length of received fragments so far + * @mono_delivery_time: stamp has a mono delivery time (EDT) * @flags: fragment queue flags * @max_size: maximum received fragment size * @fqdir: pointer to struct fqdir @@ -90,6 +91,7 @@ struct inet_frag_queue { ktime_t stamp; int len; int meat; + u8 mono_delivery_time; __u8 flags; u16 max_size; struct fqdir *fqdir; -- cgit v1.2.3-59-g8ed1b