[IPV6]: Introduce inet6_rsk()

And inet6_rsk_offset in inet_request_sock, for the same reasons as
inet_sock's pinfo6 member.
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/ip.h

@@ -110,6 +110,10 @@ struct ip_options {
 
 struct inet_request_sock {
 	struct request_sock	req;
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+	u16			inet6_rsk_offset;
+	/* 2 bytes hole, try to pack */
+#endif
 	u32			loc_addr;
 	u32			rmt_addr;
 	u16			rmt_port;

include/linux/ipv6.h

@@ -199,18 +199,17 @@ static inline int inet6_iif(const struct sk_buff *skb)
 	return IP6CB(skb)->iif;
 }
 
-struct tcp6_request_sock {
-	struct tcp_request_sock	req;
+struct inet6_request_sock {
 	struct in6_addr		loc_addr;
 	struct in6_addr		rmt_addr;
 	struct sk_buff		*pktopts;
 	int			iif;
 };
 
-static inline struct tcp6_request_sock *tcp6_rsk(const struct request_sock *sk)
-{
-	return (struct tcp6_request_sock *)sk;
-}
+struct tcp6_request_sock {
+	struct tcp_request_sock	  tcp6rsk_tcp;
+	struct inet6_request_sock tcp6rsk_inet6;
+};
 
 /**
  * struct ipv6_pinfo - ipv6 private area
@@ -304,6 +303,28 @@ static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 	return inet_sk(__sk)->pinet6;
 }
 
+static inline struct inet6_request_sock *
+			inet6_rsk(const struct request_sock *rsk)
+{
+	return (struct inet6_request_sock *)(((u8 *)rsk) +
+					     inet_rsk(rsk)->inet6_rsk_offset);
+}
+
+static inline u32 inet6_rsk_offset(struct request_sock *rsk)
+{
+	return rsk->rsk_ops->obj_size - sizeof(struct inet6_request_sock);
+}
+
+static inline struct request_sock *inet6_reqsk_alloc(struct request_sock_ops *ops)
+{
+	struct request_sock *req = reqsk_alloc(ops);
+
+	if (req != NULL)
+		inet_rsk(req)->inet6_rsk_offset = inet6_rsk_offset(req);
+
+	return req;
+}
+
 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 {
 	return (struct raw6_sock *)sk;
@@ -361,6 +382,12 @@ static inline struct ipv6_pinfo * inet6_sk(const struct sock *__sk)
 	return NULL;
 }
 
+static inline struct inet6_request_sock *
+			inet6_rsk(const struct request_sock *rsk)
+{
+	return NULL;
+}
+
 static inline struct raw6_sock *raw6_sk(const struct sock *sk)
 {
 	return NULL;

net/ipv4/inet_diag.c

@@ -489,9 +489,9 @@ static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 	if (r->idiag_family == AF_INET6) {
 		ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
-			       &tcp6_rsk(req)->loc_addr);
+			       &inet6_rsk(req)->loc_addr);
 		ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
-			       &tcp6_rsk(req)->rmt_addr);
+			       &inet6_rsk(req)->rmt_addr);
 	}
 #endif
 	nlh->nlmsg_len = skb->tail - b;
@@ -553,13 +553,13 @@ static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
 				entry.saddr =
 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 					(entry.family == AF_INET6) ?
-					tcp6_rsk(req)->loc_addr.s6_addr32 :
+					inet6_rsk(req)->loc_addr.s6_addr32 :
 #endif
 					&ireq->loc_addr;
 				entry.daddr = 
 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
 					(entry.family == AF_INET6) ?
-					tcp6_rsk(req)->rmt_addr.s6_addr32 :
+					inet6_rsk(req)->rmt_addr.s6_addr32 :
 #endif
 					&ireq->rmt_addr;
 				entry.dport = ntohs(ireq->rmt_port);

net/ipv6/inet6_connection_sock.c

@@ -61,7 +61,7 @@ struct request_sock *inet6_csk_search_req(const struct sock *sk,
 						     lopt->nr_table_entries)];
 	     (req = *prev) != NULL;
 	     prev = &req->dl_next) {
-		const struct tcp6_request_sock *treq = tcp6_rsk(req);
+		const struct inet6_request_sock *treq = inet6_rsk(req);
 
 		if (inet_rsk(req)->rmt_port == rport &&
 		    req->rsk_ops->family == AF_INET6 &&
@@ -85,7 +85,7 @@ void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
 {
 	struct inet_connection_sock *icsk = inet_csk(sk);
 	struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
-	const u32 h = inet6_synq_hash(&tcp6_rsk(req)->rmt_addr,
+	const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
 				      inet_rsk(req)->rmt_port,
 				      lopt->hash_rnd, lopt->nr_table_entries);
 

net/ipv6/tcp_ipv6.c

@@ -656,7 +656,7 @@ out:
 static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
 			      struct dst_entry *dst)
 {
-	struct tcp6_request_sock *treq = tcp6_rsk(req);
+	struct inet6_request_sock *treq = inet6_rsk(req);
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct sk_buff * skb;
 	struct ipv6_txoptions *opt = NULL;
@@ -722,8 +722,8 @@ done:
 
 static void tcp_v6_reqsk_destructor(struct request_sock *req)
 {
-	if (tcp6_rsk(req)->pktopts)
-		kfree_skb(tcp6_rsk(req)->pktopts);
+	if (inet6_rsk(req)->pktopts)
+		kfree_skb(inet6_rsk(req)->pktopts);
 }
 
 static struct request_sock_ops tcp6_request_sock_ops = {
@@ -956,7 +956,7 @@ static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
  */
 static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 {
-	struct tcp6_request_sock *treq;
+	struct inet6_request_sock *treq;
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct tcp_options_received tmp_opt;
 	struct tcp_sock *tp = tcp_sk(sk);
@@ -981,7 +981,7 @@ static int tcp_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 = reqsk_alloc(&tcp6_request_sock_ops);
+	req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
 	if (req == NULL)
 		goto drop;
 
@@ -994,7 +994,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 	tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
 	tcp_openreq_init(req, &tmp_opt, skb);
 
-	treq = tcp6_rsk(req);
+	treq = inet6_rsk(req);
 	ipv6_addr_copy(&treq->rmt_addr, &skb->nh.ipv6h->saddr);
 	ipv6_addr_copy(&treq->loc_addr, &skb->nh.ipv6h->daddr);
 	TCP_ECN_create_request(req, skb->h.th);
@@ -1035,7 +1035,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 					  struct request_sock *req,
 					  struct dst_entry *dst)
 {
-	struct tcp6_request_sock *treq = tcp6_rsk(req);
+	struct inet6_request_sock *treq = inet6_rsk(req);
 	struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
 	struct tcp6_sock *newtcp6sk;
 	struct inet_sock *newinet;
@@ -1723,14 +1723,13 @@ static int tcp_v6_destroy_sock(struct sock *sk)
 static void get_openreq6(struct seq_file *seq, 
 			 struct sock *sk, struct request_sock *req, int i, int uid)
 {
-	struct in6_addr *dest, *src;
 	int ttd = req->expires - jiffies;
+	struct in6_addr *src = &inet6_rsk(req)->loc_addr;
+	struct in6_addr *dest = &inet6_rsk(req)->rmt_addr;
 
 	if (ttd < 0)
 		ttd = 0;
 
-	src = &tcp6_rsk(req)->loc_addr;
-	dest = &tcp6_rsk(req)->rmt_addr;
 	seq_printf(seq,
 		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
 		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n",