sock: sockc cookie initializer

Initialize the cookie in one location to reduce code duplication and
avoid bugs from inconsistent initialization, such as that fixed in
commit 9887cba19978 ("ip: limit use of gso_size to udp").

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index e0eac9ef44b5..83b747538bd0 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1600,6 +1600,12 @@ struct sockcm_cookie {
         u16 tsflags;
 };
 
+static inline void sockcm_init(struct sockcm_cookie *sockc,
+                               const struct sock *sk)
+{
+        *sockc = (struct sockcm_cookie) { .tsflags = sk->sk_tsflags };
+}
+
 int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
                      struct sockcm_cookie *sockc);
 int sock_cmsg_send(struct sock *sk, struct msghdr *msg,