inetpeer: Abstract address representation further.

Future changes will add caching information, and some of
these new elements will be addresses.

Since the family is implicit via the ->daddr.family member,
replicating the family in ever address we store is entirely
redundant.

Signed-off-by: David S. Miller <[e-mail]>

include/net/inetpeer.h

···
 #include <net/ipv6.h>
 #include <asm/atomic.h>
 
-struct inetpeer_addr {
+struct inetpeer_addr_base {
 	union {
-		__be32		a4;
-		__be32		a6[4];
+		__be32			a4;
+		__be32			a6[4];
 	};
-	__u16	family;
+};
+
+struct inetpeer_addr {
+	struct inetpeer_addr_base	addr;
+	__u16				family;
 };
 
 struct inet_peer {
···
 {
 	struct inetpeer_addr daddr;
 
-	daddr.a4 = v4daddr;
+	daddr.addr.a4 = v4daddr;
 	daddr.family = AF_INET;
 	return inet_getpeer(&daddr, create);
 }
···
 {
 	struct inetpeer_addr daddr;
 
-	ipv6_addr_copy((struct in6_addr *)daddr.a6, v6daddr);
+	ipv6_addr_copy((struct in6_addr *)daddr.addr.a6, v6daddr);
 	daddr.family = AF_INET6;
 	return inet_getpeer(&daddr, create);
 }

net/ipv4/inetpeer.c

···
 	int i, n = (a->family == AF_INET ? 1 : 4);
 
 	for (i = 0; i < n; i++) {
-		if (a->a6[i] == b->a6[i])
+		if (a->addr.a6[i] == b->addr.a6[i])
 			continue;
-		if (a->a6[i] < b->a6[i])
+		if (a->addr.a6[i] < b->addr.a6[i])
 			return -1;
 		return 1;
 	}
···
 		p->daddr = *daddr;
 		atomic_set(&p->refcnt, 1);
 		atomic_set(&p->rid, 0);
-		atomic_set(&p->ip_id_count, secure_ip_id(daddr->a4));
+		atomic_set(&p->ip_id_count, secure_ip_id(daddr->addr.a4));
 		p->tcp_ts_stamp = 0;
 		p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;
 		p->rate_tokens = 0;

net/ipv4/tcp_ipv4.c

···
 		    tcp_death_row.sysctl_tw_recycle &&
 		    (dst = inet_csk_route_req(sk, req)) != NULL &&
 		    (peer = rt_get_peer((struct rtable *)dst)) != NULL &&
-		    peer->daddr.a4 == saddr) {
+		    peer->daddr.addr.a4 == saddr) {
 			inet_peer_refcheck(peer);
 			if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
 			    (s32)(peer->tcp_ts - req->ts_recent) >

net/ipv6/tcp_ipv6.c

···
 		    tcp_death_row.sysctl_tw_recycle &&
 		    (dst = inet6_csk_route_req(sk, req)) != NULL &&
 		    (peer = rt6_get_peer((struct rt6_info *)dst)) != NULL &&
-		    ipv6_addr_equal((struct in6_addr *)peer->daddr.a6,
+		    ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6,
 				    &treq->rmt_addr)) {
 			inet_peer_refcheck(peer);
 			if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&