Move definition of sk_validate_xmit_skb() from net/core/sock.c to
net/core/dev.c.

This change is in preparation of the next patch, where
sk_validate_xmit_skb() will need to cast sk to a tcp_timewait_sock *,
and access member fields. Including linux/tcp.h from linux/sock.h
creates a circular dependency, and dev.c is the only current call site
of this function.

Signed-off-by: Daniel Zahka <daniel.zahka@gmail.com>
---

Notes:
    v2:
    - patch introduced in v2

 include/net/sock.h | 22 ----------------------
 net/core/dev.c     | 22 ++++++++++++++++++++++
 2 files changed, 22 insertions(+), 22 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 19a898846b08..0ae9a6d8b53e 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -2870,28 +2870,6 @@ sk_requests_wifi_status(struct sock *sk)
 	return sk && sk_fullsock(sk) && sock_flag(sk, SOCK_WIFI_STATUS);
 }
 
-/* Checks if this SKB belongs to an HW offloaded socket
- * and whether any SW fallbacks are required based on dev.
- * Check decrypted mark in case skb_orphan() cleared socket.
- */
-static inline struct sk_buff *sk_validate_xmit_skb(struct sk_buff *skb,
-						   struct net_device *dev)
-{
-#ifdef CONFIG_SOCK_VALIDATE_XMIT
-	struct sock *sk = skb->sk;
-
-	if (sk && sk_fullsock(sk) && sk->sk_validate_xmit_skb) {
-		skb = sk->sk_validate_xmit_skb(sk, dev, skb);
-	} else if (unlikely(skb_is_decrypted(skb))) {
-		pr_warn_ratelimited("unencrypted skb with no associated socket - dropping\n");
-		kfree_skb(skb);
-		skb = NULL;
-	}
-#endif
-
-	return skb;
-}
-
 /* This helper checks if a socket is a LISTEN or NEW_SYN_RECV
  * SYNACK messages can be attached to either ones (depending on SYNCOOKIE)
  */
diff --git a/net/core/dev.c b/net/core/dev.c
index 7ee808eb068e..b825b3f5b7db 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3896,6 +3896,28 @@ int skb_csum_hwoffload_help(struct sk_buff *skb,
 }
 EXPORT_SYMBOL(skb_csum_hwoffload_help);
 
+/* Checks if this SKB belongs to an HW offloaded socket
+ * and whether any SW fallbacks are required based on dev.
+ * Check decrypted mark in case skb_orphan() cleared socket.
+ */
+static struct sk_buff *sk_validate_xmit_skb(struct sk_buff *skb,
+					    struct net_device *dev)
+{
+#ifdef CONFIG_SOCK_VALIDATE_XMIT
+	struct sock *sk = skb->sk;
+
+	if (sk && sk_fullsock(sk) && sk->sk_validate_xmit_skb) {
+		skb = sk->sk_validate_xmit_skb(sk, dev, skb);
+	} else if (unlikely(skb_is_decrypted(skb))) {
+		pr_warn_ratelimited("unencrypted skb with no associated socket - dropping\n");
+		kfree_skb(skb);
+		skb = NULL;
+	}
+#endif
+
+	return skb;
+}
+
 static struct sk_buff *validate_xmit_unreadable_skb(struct sk_buff *skb,
 						    struct net_device *dev)
 {
-- 
2.47.1