[RFC v3 net-next 06/18] net: ipv4: udp: Hook into time based transmission.

[Jesus Sanchez-Palencia]

From: Richard Cochran <rcoch...@linutronix.de>

For udp 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/udp.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 3013404d0935..d683bbde526b 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -926,6 +926,7 @@ int udp_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.oif = sk->sk_bound_dev_if;
 
@@ -1040,8 +1041,10 @@ int udp_sendmsg(struct sock *sk, struct msghdr *msg, 
size_t len)
                                  sizeof(struct udphdr), &ipc, &rt,
                                  msg->msg_flags);
                err = PTR_ERR(skb);
-               if (!IS_ERR_OR_NULL(skb))
+               if (!IS_ERR_OR_NULL(skb)) {
+                       skb->tstamp = ipc.sockc.transmit_time;
                        err = udp_send_skb(skb, fl4);
+               }
                goto out;
        }
 
-- 
2.16.2