@@ -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;
@@ -572,6 +572,7 @@ void inet_frag_reasm_finish(struct inet_frag_queue *q, struct sk_buff *head,
skb_mark_not_on_list(head);
head->prev = NULL;
head->tstamp = q->stamp;
+ head->mono_delivery_time = q->mono_delivery_time;
}
EXPORT_SYMBOL(inet_frag_reasm_finish);
@@ -349,6 +349,7 @@ static int ip_frag_queue(struct ipq *qp, struct sk_buff *skb)
qp->iif = dev->ifindex;
qp->q.stamp = skb->tstamp;
+ qp->q.mono_delivery_time = skb->mono_delivery_time;
qp->q.meat += skb->len;
qp->ecn |= ecn;
add_frag_mem_limit(qp->q.fqdir, skb->truesize);
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 <kafai@fb.com> --- include/net/inet_frag.h | 2 ++ net/ipv4/inet_fragment.c | 1 + net/ipv4/ip_fragment.c | 1 + 3 files changed, 4 insertions(+)