net: use sk_is_tcp() in more places

Move sk_is_tcp() to include/net/sock.h and use it where we can.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/skmsg.h

@@ -507,12 +507,6 @@ static inline bool sk_psock_strp_enabled(struct sk_psock *psock)
 	return !!psock->saved_data_ready;
 }
 
-static inline bool sk_is_tcp(const struct sock *sk)
-{
-	return sk->sk_type == SOCK_STREAM &&
-	       sk->sk_protocol == IPPROTO_TCP;
-}
-
 static inline bool sk_is_udp(const struct sock *sk)
 {
 	return sk->sk_type == SOCK_DGRAM &&

include/net/sock.h

@@ -2638,6 +2638,11 @@ static inline void skb_setup_tx_timestamp(struct sk_buff *skb, __u16 tsflags)
 			   &skb_shinfo(skb)->tskey);
 }
 
+static inline bool sk_is_tcp(const struct sock *sk)
+{
+	return sk->sk_type == SOCK_STREAM && sk->sk_protocol == IPPROTO_TCP;
+}
+
 /**
  * sk_eat_skb - Release a skb if it is no longer needed
  * @sk: socket to eat this skb from

net/core/skbuff.c

@@ -4849,8 +4849,7 @@ static void __skb_complete_tx_timestamp(struct sk_buff *skb,
 	serr->header.h4.iif = skb->dev ? skb->dev->ifindex : 0;
 	if (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID) {
 		serr->ee.ee_data = skb_shinfo(skb)->tskey;
-		if (sk->sk_protocol == IPPROTO_TCP &&
-		    sk->sk_type == SOCK_STREAM)
+		if (sk_is_tcp(sk))
 			serr->ee.ee_data -= sk->sk_tskey;
 	}
 
@@ -4919,8 +4918,7 @@ void __skb_tstamp_tx(struct sk_buff *orig_skb,
 	if (tsonly) {
 #ifdef CONFIG_INET
 		if ((sk->sk_tsflags & SOF_TIMESTAMPING_OPT_STATS) &&
-		    sk->sk_protocol == IPPROTO_TCP &&
-		    sk->sk_type == SOCK_STREAM) {
+		    sk_is_tcp(sk)) {
 			skb = tcp_get_timestamping_opt_stats(sk, orig_skb,
 							     ack_skb);
 			opt_stats = true;

net/core/sock.c

@@ -872,8 +872,7 @@ int sock_set_timestamping(struct sock *sk, int optname,
 
 	if (val & SOF_TIMESTAMPING_OPT_ID &&
 	    !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
-		if (sk->sk_protocol == IPPROTO_TCP &&
-		    sk->sk_type == SOCK_STREAM) {
+		if (sk_is_tcp(sk)) {
 			if ((1 << sk->sk_state) &
 			    (TCPF_CLOSE | TCPF_LISTEN))
 				return -EINVAL;
@@ -1370,8 +1369,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
 
 	case SO_ZEROCOPY:
 		if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) {
-			if (!((sk->sk_type == SOCK_STREAM &&
-			       sk->sk_protocol == IPPROTO_TCP) ||
+			if (!(sk_is_tcp(sk) ||
 			      (sk->sk_type == SOCK_DGRAM &&
 			       sk->sk_protocol == IPPROTO_UDP)))
 				ret = -ENOTSUPP;