inet: move inet->nodefrag to inet->inet_flags

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

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_sock.h

@@ -229,7 +229,6 @@ struct inet_sock {
 	__u8			min_ttl;
 	__u8			mc_ttl;
 	__u8			pmtudisc;
-	__u8			nodefrag:1;
 	__u8			bind_address_no_port:1,
 				defer_connect:1; /* Indicates that fastopen_connect is set
 						  * and cookie exists so we defer connect
@@ -270,6 +269,7 @@ enum {
 	INET_FLAGS_MC_ALL	= 14,
 	INET_FLAGS_TRANSPARENT	= 15,
 	INET_FLAGS_IS_ICSK	= 16,
+	INET_FLAGS_NODEFRAG	= 17,
 };
 
 /* cmsg flags for inet */

net/ipv4/af_inet.c

@@ -333,7 +333,7 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
 	inet = inet_sk(sk);
 	inet_assign_bit(IS_ICSK, sk, INET_PROTOSW_ICSK & answer_flags);
 
-	inet->nodefrag = 0;
+	inet_clear_bit(NODEFRAG, sk);
 
 	if (SOCK_RAW == sock->type) {
 		inet->inet_num = protocol;

net/ipv4/inet_diag.c

@@ -189,7 +189,7 @@ int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
 	inet_sockopt.mc_loop	= inet_test_bit(MC_LOOP, sk);
 	inet_sockopt.transparent = inet_test_bit(TRANSPARENT, sk);
 	inet_sockopt.mc_all	= inet_test_bit(MC_ALL, sk);
-	inet_sockopt.nodefrag	= inet->nodefrag;
+	inet_sockopt.nodefrag	= inet_test_bit(NODEFRAG, sk);
 	inet_sockopt.bind_address_no_port = inet->bind_address_no_port;
 	inet_sockopt.recverr_rfc4884 = inet_test_bit(RECVERR_RFC4884, sk);
 	inet_sockopt.defer_connect = inet->defer_connect;

net/ipv4/ip_sockglue.c

@@ -1015,6 +1015,11 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
 			goto e_inval;
 		inet_assign_bit(TRANSPARENT, sk, val);
 		return 0;
+	case IP_NODEFRAG:
+		if (sk->sk_type != SOCK_RAW)
+			return -ENOPROTOOPT;
+		inet_assign_bit(NODEFRAG, sk, val);
+		return 0;
 	}
 
 	err = 0;
@@ -1079,13 +1084,6 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname,
 			goto e_inval;
 		inet->uc_ttl = val;
 		break;
-	case IP_NODEFRAG:
-		if (sk->sk_type != SOCK_RAW) {
-			err = -ENOPROTOOPT;
-			break;
-		}
-		inet->nodefrag = val ? 1 : 0;
-		break;
 	case IP_BIND_ADDRESS_NO_PORT:
 		inet->bind_address_no_port = val ? 1 : 0;
 		break;
@@ -1586,6 +1584,9 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
 	case IP_TRANSPARENT:
 		val = inet_test_bit(TRANSPARENT, sk);
 		goto copyval;
+	case IP_NODEFRAG:
+		val = inet_test_bit(NODEFRAG, sk);
+		goto copyval;
 	}
 
 	if (needs_rtnl)
@@ -1633,9 +1634,6 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname,
 		       inet->uc_ttl);
 		break;
 	}
-	case IP_NODEFRAG:
-		val = inet->nodefrag;
-		break;
 	case IP_BIND_ADDRESS_NO_PORT:
 		val = inet->bind_address_no_port;
 		break;

net/ipv4/netfilter/nf_defrag_ipv4.c

@@ -66,7 +66,7 @@ static unsigned int ipv4_conntrack_defrag(void *priv,
 	struct sock *sk = skb->sk;
 
 	if (sk && sk_fullsock(sk) && (sk->sk_family == PF_INET) &&
-	    inet_sk(sk)->nodefrag)
+	    inet_test_bit(NODEFRAG, sk))
 		return NF_ACCEPT;
 
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)

net/netfilter/ipvs/ip_vs_core.c

@@ -1346,7 +1346,7 @@ ip_vs_out_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *stat
 	if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
 		     af == AF_INET)) {
 
-		if (sk->sk_family == PF_INET && inet_sk(sk)->nodefrag)
+		if (sk->sk_family == PF_INET && inet_test_bit(NODEFRAG, sk))
 			return NF_ACCEPT;
 	}
 
@@ -1946,7 +1946,7 @@ ip_vs_in_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state
 	if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
 		     af == AF_INET)) {
 
-		if (sk->sk_family == PF_INET && inet_sk(sk)->nodefrag)
+		if (sk->sk_family == PF_INET && inet_test_bit(NODEFRAG, sk))
 			return NF_ACCEPT;
 	}