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net: ipv4: Hook into time based transmission

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Add a transmit_time field to struct inet_cork, then copy the
timestamp from the CMSG cookie at ip_setup_cork() so we can
safely copy it into the skb later during __ip_make_skb().

For the raw fast path, just perform the copy at raw_send_hdrinc().

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesus Sanchez-Palencia
2018-07-03 15:42:49 -07:00
committed by David S. Miller
parent 80b14dee2b
commit bc969a9778
6 changed files with 10 additions and 0 deletions
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3
net/ipv4/ip_output.c
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@@ -1154,6 +1154,7 @@ static int ip_setup_cork(struct sock *sk, struct inet_cork *cork,
cork->tos = ipc->tos;
cork->priority = ipc->priority;
cork->tx_flags = ipc->tx_flags;
cork->transmit_time = ipc->sockc.transmit_time;
return 0;
}
@@ -1414,6 +1415,7 @@ struct sk_buff *__ip_make_skb(struct sock *sk,
skb->priority = (cork->tos != -1) ? cork->priority: sk->sk_priority;
skb->mark = sk->sk_mark;
skb->tstamp = cork->transmit_time;
/*
* Steal rt from cork.dst to avoid a pair of atomic_inc/atomic_dec
* on dst refcount
@@ -1551,6 +1553,7 @@ void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
ipc.tx_flags = 0;
ipc.ttl = 0;
ipc.tos = -1;
ipc.sockc.transmit_time = 0;
if (replyopts.opt.opt.optlen) {
ipc.opt = &replyopts.opt;