ip: support for TX timestamps on UDP and RAW sockets

Instructions for time stamping outgoing packets are take from the
socket layer and later copied into the new skb.

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 8ebe86dd72af..3e7e910c7c0f 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -935,6 +935,10 @@ alloc_new_skb:
                                                            sk->sk_allocation);
                                 if (unlikely(skb == NULL))
                                         err = -ENOBUFS;
+                                else
+                                        /* only the initial fragment is
+                                           time stamped */
+                                        ipc->shtx.flags = 0;
                         }
                         if (skb == NULL)
                                 goto error;
@@ -945,6 +949,7 @@ alloc_new_skb:
                         skb->ip_summed = csummode;
                         skb->csum = 0;
                         skb_reserve(skb, hh_len);
+                        *skb_tx(skb) = ipc->shtx;
 
                         /*
                          *      Find where to start putting bytes.
@@ -1364,6 +1369,7 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
 
         daddr = ipc.addr = rt->rt_src;
         ipc.opt = NULL;
+        ipc.shtx.flags = 0;
 
         if (replyopts.opt.optlen) {
                 ipc.opt = &replyopts.opt;