ipv6: add missing tx timestamping on IPPROTO_RAW

Raw sockets support tx timestamping, but one case is missing.

IPPROTO_RAW takes a separate packet construction path. raw_send_hdrinc
has an explicit call to sock_tx_timestamp, but rawv6_send_hdrinc does
not. Add it.

Fixes: 11878b40 ("net-timestamp: SOCK_RAW and PING timestamping")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/raw.c

@@ -658,6 +658,8 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
 
 	skb->ip_summed = CHECKSUM_NONE;
 
+	sock_tx_timestamp(sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
+
 	if (flags & MSG_CONFIRM)
 		skb_set_dst_pending_confirm(skb, 1);