net: ipv6: Hook into time based transmission

Add a struct sockcm_cookie parameter to ip6_setup_cork() so
we can easily re-use the transmit_time field from struct inet_cork
for most paths, by copying the timestamp from the CMSG cookie.
This is later copied into the skb during __ip6_make_skb().

For the raw fast path, also pass the sockcm_cookie as a parameter
so we can just perform the copy at rawv6_send_hdrinc() directly.

Signed-off-by: Jesus Sanchez-Palencia <jesus.sanchez-palencia@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_output.c

@@ -1158,7 +1158,8 @@ static void ip6_append_data_mtu(unsigned int *mtu,
 
 static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
 			  struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6,
-			  struct rt6_info *rt, struct flowi6 *fl6)
+			  struct rt6_info *rt, struct flowi6 *fl6,
+			  const struct sockcm_cookie *sockc)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	unsigned int mtu;
@@ -1226,6 +1227,8 @@ static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
 		cork->base.flags |= IPCORK_ALLFRAG;
 	cork->base.length = 0;
 
+	cork->base.transmit_time = sockc->transmit_time;
+
 	return 0;
 }
 
@@ -1575,7 +1578,7 @@ int ip6_append_data(struct sock *sk,
 		 * setup for corking
 		 */
 		err = ip6_setup_cork(sk, &inet->cork, &np->cork,
-				     ipc6, rt, fl6);
+				     ipc6, rt, fl6, sockc);
 		if (err)
 			return err;
 
@@ -1673,6 +1676,8 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
 	skb->priority = sk->sk_priority;
 	skb->mark = sk->sk_mark;
 
+	skb->tstamp = cork->base.transmit_time;
+
 	skb_dst_set(skb, dst_clone(&rt->dst));
 	IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
 	if (proto == IPPROTO_ICMPV6) {
@@ -1765,7 +1770,7 @@ struct sk_buff *ip6_make_skb(struct sock *sk,
 	cork->base.opt = NULL;
 	cork->base.dst = NULL;
 	v6_cork.opt = NULL;
-	err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt, fl6);
+	err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt, fl6, sockc);
 	if (err) {
 		ip6_cork_release(cork, &v6_cork);
 		return ERR_PTR(err);

net/ipv6/raw.c

@@ -620,7 +620,7 @@ static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
 
 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
 			struct flowi6 *fl6, struct dst_entry **dstp,
-			unsigned int flags)
+			unsigned int flags, const struct sockcm_cookie *sockc)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct net *net = sock_net(sk);
@@ -650,6 +650,7 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
 	skb->protocol = htons(ETH_P_IPV6);
 	skb->priority = sk->sk_priority;
 	skb->mark = sk->sk_mark;
+	skb->tstamp = sockc->transmit_time;
 	skb_dst_set(skb, &rt->dst);
 	*dstp = NULL;
 
@@ -848,6 +849,7 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 		fl6.flowi6_oif = sk->sk_bound_dev_if;
 
 	sockc.tsflags = sk->sk_tsflags;
+	sockc.transmit_time = 0;
 	if (msg->msg_controllen) {
 		opt = &opt_space;
 		memset(opt, 0, sizeof(struct ipv6_txoptions));
@@ -921,7 +923,8 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
 back_from_confirm:
 	if (inet->hdrincl)
-		err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, msg->msg_flags);
+		err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
+					msg->msg_flags, &sockc);
 	else {
 		ipc6.opt = opt;
 		lock_sock(sk);

net/ipv6/udp.c

@@ -1148,6 +1148,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	ipc6.dontfrag = -1;
 	ipc6.gso_size = up->gso_size;
 	sockc.tsflags = sk->sk_tsflags;
+	sockc.transmit_time = 0;
 
 	/* destination address check */
 	if (sin6) {