net: remove inet6_reqsk_alloc

Since pktops is only used for IPv6 only and opts is used for IPv4
only, we can move these fields into a union and this allows us to drop
the inet6_reqsk_alloc function as after this change it becomes
equivalent with inet_reqsk_alloc.

This patch also fixes a kmemcheck issue in the IPv6 stack: the flags
field was not annotated after a request_sock was allocated.

Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/ipv6.h

@@ -256,16 +256,6 @@ static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 	return inet_sk(__sk)->pinet6;
 }
 
-static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
-{
-	struct request_sock *req = reqsk_alloc(ops);
-
-	if (req)
-		inet_rsk(req)->pktopts = NULL;
-
-	return req;
-}
-
 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 {
 	return (struct raw6_sock *)sk;

include/net/inet_sock.h

@@ -88,8 +88,10 @@ struct inet_request_sock {
 				acked	   : 1,
 				no_srccheck: 1;
 	kmemcheck_bitfield_end(flags);
-	struct ip_options_rcu	*opt;
-	struct sk_buff		*pktopts;
+	union {
+		struct ip_options_rcu	*opt;
+		struct sk_buff		*pktopts;
+	};
 	u32                     ir_mark;
 };
 

net/dccp/ipv6.c

@@ -386,7 +386,7 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
 		goto drop;
 
-	req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
+	req = inet_reqsk_alloc(&dccp6_request_sock_ops);
 	if (req == NULL)
 		goto drop;
 

net/ipv6/syncookies.c

@@ -187,7 +187,7 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
 		goto out;
 
 	ret = NULL;
-	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
+	req = inet_reqsk_alloc(&tcp6_request_sock_ops);
 	if (!req)
 		goto out;
 

net/ipv6/tcp_ipv6.c

@@ -1010,7 +1010,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 		goto drop;
 	}
 
-	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
+	req = inet_reqsk_alloc(&tcp6_request_sock_ops);
 	if (req == NULL)
 		goto drop;