3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Willem de Bruijn <will...@google.com>

[ Upstream commit f4713a3dfad045d46afcb9c2a7d0bba288920ed4 ]

TCP timestamping introduced MSG_ERRQUEUE handling for TCP sockets.
If the socket is of family AF_INET6, call ipv6_recv_error instead
of ip_recv_error.

This change is more complex than a single branch due to the loadable
ipv6 module. It reuses a pre-existing indirect function call from
ping. The ping code is safe to call, because it is part of the core
ipv6 module and always present when AF_INET6 sockets are active.

Fixes: 4ed2d765 (net-timestamp: TCP timestamping)
Signed-off-by: Willem de Bruijn <will...@google.com>

----

It may also be worthwhile to add WARN_ON_ONCE(sk->family == AF_INET6)
to ip_recv_error.
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 include/net/inet_common.h |    2 ++
 net/ipv4/af_inet.c        |   11 +++++++++++
 net/ipv4/ping.c           |   12 ++----------
 net/ipv4/tcp.c            |    2 +-
 4 files changed, 16 insertions(+), 11 deletions(-)

--- a/include/net/inet_common.h
+++ b/include/net/inet_common.h
@@ -37,6 +37,8 @@ int inet_ioctl(struct socket *sock, unsi
 int inet_ctl_sock_create(struct sock **sk, unsigned short family,
                         unsigned short type, unsigned char protocol,
                         struct net *net);
+int inet_recv_error(struct sock *sk, struct msghdr *msg, int len,
+                   int *addr_len);
 
 static inline void inet_ctl_sock_destroy(struct sock *sk)
 {
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1421,6 +1421,17 @@ out:
        return pp;
 }
 
+int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int 
*addr_len)
+{
+       if (sk->sk_family == AF_INET)
+               return ip_recv_error(sk, msg, len, addr_len);
+#if IS_ENABLED(CONFIG_IPV6)
+       if (sk->sk_family == AF_INET6)
+               return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
+#endif
+       return -EINVAL;
+}
+
 static int inet_gro_complete(struct sk_buff *skb, int nhoff)
 {
        __be16 newlen = htons(skb->len - nhoff);
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -855,16 +855,8 @@ int ping_recvmsg(struct kiocb *iocb, str
        if (flags & MSG_OOB)
                goto out;
 
-       if (flags & MSG_ERRQUEUE) {
-               if (family == AF_INET) {
-                       return ip_recv_error(sk, msg, len, addr_len);
-#if IS_ENABLED(CONFIG_IPV6)
-               } else if (family == AF_INET6) {
-                       return pingv6_ops.ipv6_recv_error(sk, msg, len,
-                                                         addr_len);
-#endif
-               }
-       }
+       if (flags & MSG_ERRQUEUE)
+               return inet_recv_error(sk, msg, len, addr_len);
 
        skb = skb_recv_datagram(sk, flags, noblock, &err);
        if (!skb)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1633,7 +1633,7 @@ int tcp_recvmsg(struct kiocb *iocb, stru
        u32 urg_hole = 0;
 
        if (unlikely(flags & MSG_ERRQUEUE))
-               return ip_recv_error(sk, msg, len, addr_len);
+               return inet_recv_error(sk, msg, len, addr_len);
 
        if (sk_can_busy_loop(sk) && skb_queue_empty(&sk->sk_receive_queue) &&
            (sk->sk_state == TCP_ESTABLISHED))


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