inet: move inet->bind_address_no_port to inet->inet_flags

IP_BIND_ADDRESS_NO_PORT socket option can now be set/read
without locking the socket.

Signed-off-by: Eric Dumazet <[email protected]>
Acked-by: Soheil Hassas Yeganeh <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: edumazet

include/net/inet_sock.h

@@ -229,8 +229,7 @@ struct inet_sock {
 	__u8			min_ttl;
 	__u8			mc_ttl;
 	__u8			pmtudisc;
-	__u8			bind_address_no_port:1,
-				defer_connect:1; /* Indicates that fastopen_connect is set
+	__u8			defer_connect:1; /* Indicates that fastopen_connect is set
 						  * and cookie exists so we defer connect
 						  * until first data frame is written
 						  */
@@ -270,6 +269,7 @@ enum {
 	INET_FLAGS_TRANSPARENT	= 15,
 	INET_FLAGS_IS_ICSK	= 16,
 	INET_FLAGS_NODEFRAG	= 17,
+	INET_FLAGS_BIND_ADDRESS_NO_PORT = 18,
 };
 
 /* cmsg flags for inet */

net/ipv4/af_inet.c

@@ -529,7 +529,7 @@ int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 		inet->inet_saddr = 0;  /* Use device */
 
 	/* Make sure we are allowed to bind here. */
-	if (snum || !(inet->bind_address_no_port ||
+	if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 		err = sk->sk_prot->get_port(sk, snum);
 		if (err) {

net/ipv4/inet_diag.c

@@ -190,7 +190,7 @@ int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
 	inet_sockopt.transparent = inet_test_bit(TRANSPARENT, sk);
 	inet_sockopt.mc_all	= inet_test_bit(MC_ALL, sk);
 	inet_sockopt.nodefrag	= inet_test_bit(NODEFRAG, sk);
-	inet_sockopt.bind_address_no_port = inet->bind_address_no_port;
+	inet_sockopt.bind_address_no_port = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
 	inet_sockopt.recverr_rfc4884 = inet_test_bit(RECVERR_RFC4884, sk);
 	inet_sockopt.defer_connect = inet->defer_connect;
 	if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),

net/ipv4/ip_sockglue.c

@@ -1020,6 +1020,9 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
 			return -ENOPROTOOPT;
 		inet_assign_bit(NODEFRAG, sk, val);
 		return 0;
+	case IP_BIND_ADDRESS_NO_PORT:
+		inet_assign_bit(BIND_ADDRESS_NO_PORT, sk, val);
+		return 0;
 	}
 
 	err = 0;
@@ -1084,9 +1087,6 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
 			goto e_inval;
 		inet->uc_ttl = val;
 		break;
-	case IP_BIND_ADDRESS_NO_PORT:
-		inet->bind_address_no_port = val ? 1 : 0;
-		break;
 	case IP_MTU_DISCOVER:
 		if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT)
 			goto e_inval;
@@ -1587,6 +1587,9 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
 	case IP_NODEFRAG:
 		val = inet_test_bit(NODEFRAG, sk);
 		goto copyval;
+	case IP_BIND_ADDRESS_NO_PORT:
+		val = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
+		goto copyval;
 	}
 
 	if (needs_rtnl)
@@ -1634,9 +1637,6 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
 		       inet->uc_ttl);
 		break;
 	}
-	case IP_BIND_ADDRESS_NO_PORT:
-		val = inet->bind_address_no_port;
-		break;
 	case IP_MTU_DISCOVER:
 		val = inet->pmtudisc;
 		break;

net/ipv6/af_inet6.c

@@ -399,7 +399,7 @@ static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
 		sk->sk_ipv6only = 1;
 
 	/* Make sure we are allowed to bind here. */
-	if (snum || !(inet->bind_address_no_port ||
+	if (snum || !(inet_test_bit(BIND_ADDRESS_NO_PORT, sk) ||
 		      (flags & BIND_FORCE_ADDRESS_NO_PORT))) {
 		err = sk->sk_prot->get_port(sk, snum);
 		if (err) {