Merge branch 'net-y2038-safe-socket-timestamps'

Deepa Dinamani says:

====================
net: y2038-safe socket timestamps

The series introduces new socket timestamps that are
y2038 safe.

The time data types used for the existing socket timestamp
options: SO_TIMESTAMP, SO_TIMESTAMPNS and SO_TIMESTAMPING
are not y2038 safe. The series introduces SO_TIMESTAMP_NEW,
SO_TIMESTAMPNS_NEW and SO_TIMESTAMPING_NEW to replace these.
These new timestamps can be used on all architectures.

The alternative considered was to extend the sys_setsockopt()
by using the flags. We did not receive any strong opinions about
either of the approaches. Hence, this was chosen, as glibc folks
preferred this.

The series does not deal with updating the internal kernel socket
calls like rxrpc to make them y2038 safe. This will be dealt
with separately.

Note that the timestamps behavior already does not match the
man page specific behavior:
SIOCGSTAMP
    This ioctl should only be used if the socket option SO_TIMESTAMP
	is not set on the socket. Otherwise, it returns the timestamp of
	the last packet that was received while SO_TIMESTAMP was not set,
	or it fails if no such packet has been received,
	(i.e., ioctl(2) returns -1 with errno set to ENOENT).

The recommendation is to update the man page to remove the above statement.

The overview of the socket timestamp series is as below:
1. Delete asm specific socket.h when possible.
2. Support SO/SCM_TIMESTAMP* options only in userspace.
3. Rename current SO/SCM_TIMESTAMP* to SO/SCM_TIMESTAMP*_OLD.
3. Alter socket options so that SOCK_RCVTSTAMPNS does
   not rely on SOCK_RCVTSTAMP.
4. Introduce y2038 safe types for socket timestamp.
5. Introduce new y2038 safe socket options SO/SCM_TIMESTAMP*_NEW.
6. Intorduce new y2038 safe socket timeout options.

Changes since v4:
* Fixed the typo in calling sock_get_timeout()

Changes since v3:
* Rebased onto net-next and fixups as per review comments
* Merged the socket timeout series
* Integrated Arnd's patch to simplify compat handling of timeout syscalls

Changes since v2:
* Removed extra functions to reduce diff churn as per code review

Changes since v1:
* Dropped the change to disentangle sock flags
* Renamed sock_timeval to __kernel_sock_timeval
* Updated a few comments
* Added documentation changes
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 41 insertions, 20 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 6f8d292ad501..cab6b2f2f61d 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1844,57 +1844,78 @@ out:
 #endif
 
 static void tcp_update_recv_tstamps(struct sk_buff *skb,
-				    struct scm_timestamping *tss)
+				    struct scm_timestamping_internal *tss)
 {
 	if (skb->tstamp)
-		tss->ts[0] = ktime_to_timespec(skb->tstamp);
+		tss->ts[0] = ktime_to_timespec64(skb->tstamp);
 	else
-		tss->ts[0] = (struct timespec) {0};
+		tss->ts[0] = (struct timespec64) {0};
 
 	if (skb_hwtstamps(skb)->hwtstamp)
-		tss->ts[2] = ktime_to_timespec(skb_hwtstamps(skb)->hwtstamp);
+		tss->ts[2] = ktime_to_timespec64(skb_hwtstamps(skb)->hwtstamp);
 	else
-		tss->ts[2] = (struct timespec) {0};
+		tss->ts[2] = (struct timespec64) {0};
 }
 
 /* Similar to __sock_recv_timestamp, but does not require an skb */
 static void tcp_recv_timestamp(struct msghdr *msg, const struct sock *sk,
-			       struct scm_timestamping *tss)
+			       struct scm_timestamping_internal *tss)
 {
-	struct timeval tv;
+	int new_tstamp = sock_flag(sk, SOCK_TSTAMP_NEW);
 	bool has_timestamping = false;
 
 	if (tss->ts[0].tv_sec || tss->ts[0].tv_nsec) {
 		if (sock_flag(sk, SOCK_RCVTSTAMP)) {
 			if (sock_flag(sk, SOCK_RCVTSTAMPNS)) {
-				put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPNS,
-					 sizeof(tss->ts[0]), &tss->ts[0]);
-			} else {
-				tv.tv_sec = tss->ts[0].tv_sec;
-				tv.tv_usec = tss->ts[0].tv_nsec / 1000;
+				if (new_tstamp) {
+					struct __kernel_timespec kts = {tss->ts[0].tv_sec, tss->ts[0].tv_nsec};
+
+					put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_NEW,
+						 sizeof(kts), &kts);
+				} else {
+					struct timespec ts_old = timespec64_to_timespec(tss->ts[0]);
 
-				put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMP,
-					 sizeof(tv), &tv);
+					put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMPNS_OLD,
+						 sizeof(ts_old), &ts_old);
+				}
+			} else {
+				if (new_tstamp) {
+					struct __kernel_sock_timeval stv;
+
+					stv.tv_sec = tss->ts[0].tv_sec;
+					stv.tv_usec = tss->ts[0].tv_nsec / 1000;
+					put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_NEW,
+						 sizeof(stv), &stv);
+				} else {
+					struct __kernel_old_timeval tv;
+
+					tv.tv_sec = tss->ts[0].tv_sec;
+					tv.tv_usec = tss->ts[0].tv_nsec / 1000;
+					put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP_OLD,
+						 sizeof(tv), &tv);
+				}
 			}
 		}
 
 		if (sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE)
 			has_timestamping = true;
 		else
-			tss->ts[0] = (struct timespec) {0};
+			tss->ts[0] = (struct timespec64) {0};
 	}
 
 	if (tss->ts[2].tv_sec || tss->ts[2].tv_nsec) {
 		if (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_HARDWARE)
 			has_timestamping = true;
 		else
-			tss->ts[2] = (struct timespec) {0};
+			tss->ts[2] = (struct timespec64) {0};
 	}
 
 	if (has_timestamping) {
-		tss->ts[1] = (struct timespec) {0};
-		put_cmsg(msg, SOL_SOCKET, SCM_TIMESTAMPING,
-			 sizeof(*tss), tss);
+		tss->ts[1] = (struct timespec64) {0};
+		if (sock_flag(sk, SOCK_TSTAMP_NEW))
+			put_cmsg_scm_timestamping64(msg, tss);
+		else
+			put_cmsg_scm_timestamping(msg, tss);
 	}
 }
 
@@ -1935,7 +1956,7 @@ int tcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
 	long timeo;
 	struct sk_buff *skb, *last;
 	u32 urg_hole = 0;
-	struct scm_timestamping tss;
+	struct scm_timestamping_internal tss;
 	bool has_tss = false;
 	bool has_cmsg;