bpf: net: Change do_tcp_setsockopt() to use the sockopt's lock_sock() and capable()

Similar to the earlier patch that avoids sk_setsockopt() from
taking sk lock and doing capable test when called by bpf.  This patch
changes do_tcp_setsockopt() to use the sockopt_{lock,release}_sock()
and sockopt_[ns_]capable().
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220817061730.4176021-1-kafai@fb.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

net/ipv4/tcp.c

@@ -3202,7 +3202,7 @@ EXPORT_SYMBOL(tcp_disconnect);
 
 static inline bool tcp_can_repair_sock(const struct sock *sk)
 {
-	return ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN) &&
+	return sockopt_ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN) &&
 		(sk->sk_state != TCP_LISTEN);
 }
 
@@ -3502,11 +3502,11 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
 			return -EFAULT;
 		name[val] = 0;
 
-		lock_sock(sk);
+		sockopt_lock_sock(sk);
 		err = tcp_set_congestion_control(sk, name, true,
-						 ns_capable(sock_net(sk)->user_ns,
-							    CAP_NET_ADMIN));
-		release_sock(sk);
+						 sockopt_ns_capable(sock_net(sk)->user_ns,
+								    CAP_NET_ADMIN));
+		sockopt_release_sock(sk);
 		return err;
 	}
 	case TCP_ULP: {
@@ -3522,9 +3522,9 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
 			return -EFAULT;
 		name[val] = 0;
 
-		lock_sock(sk);
+		sockopt_lock_sock(sk);
 		err = tcp_set_ulp(sk, name);
-		release_sock(sk);
+		sockopt_release_sock(sk);
 		return err;
 	}
 	case TCP_FASTOPEN_KEY: {
@@ -3557,7 +3557,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
 	if (copy_from_sockptr(&val, optval, sizeof(val)))
 		return -EFAULT;
 
-	lock_sock(sk);
+	sockopt_lock_sock(sk);
 
 	switch (optname) {
 	case TCP_MAXSEG:
@@ -3779,7 +3779,7 @@ static int do_tcp_setsockopt(struct sock *sk, int level, int optname,
 		break;
 	}
 
-	release_sock(sk);
+	sockopt_release_sock(sk);
 	return err;
 }