xfrm: simplify xfrm_address_t use

In many places, the a6 field is typecasted to struct in6_addr. As the
fields are in union anyway, just add in6_addr type to the union and
get rid of the typecasting.

Modifying the uapi header is okay, the union has still the same size.
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/xfrm.h

@@ -1025,7 +1025,7 @@ xfrm_addr_any(const xfrm_address_t *addr, unsigned short family)
 	case AF_INET:
 		return addr->a4 == 0;
 	case AF_INET6:
-		return ipv6_addr_any((struct in6_addr *)&addr->a6);
+		return ipv6_addr_any(&addr->in6);
 	}
 	return 0;
 }
@@ -1238,8 +1238,8 @@ void xfrm_flowi_addr_get(const struct flowi *fl,
 		memcpy(&daddr->a4, &fl->u.ip4.daddr, sizeof(daddr->a4));
 		break;
 	case AF_INET6:
-		*(struct in6_addr *)saddr->a6 = fl->u.ip6.saddr;
-		*(struct in6_addr *)daddr->a6 = fl->u.ip6.daddr;
+		saddr->in6 = fl->u.ip6.saddr;
+		daddr->in6 = fl->u.ip6.daddr;
 		break;
 	}
 }

include/uapi/linux/xfrm.h

 #ifndef _LINUX_XFRM_H
 #define _LINUX_XFRM_H
 
+#include <linux/in6.h>
 #include <linux/types.h>
 
 /* All of the structures in this file may not change size as they are
@@ -13,6 +14,7 @@
 typedef union {
 	__be32		a4;
 	__be32		a6[4];
+	struct in6_addr	in6;
 } xfrm_address_t;
 
 /* Ident of a specific xfrm_state. It is used on input to lookup

net/ipv6/xfrm6_mode_beet.c

@@ -95,8 +95,8 @@ static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb)
 
 	ip6h = ipv6_hdr(skb);
 	ip6h->payload_len = htons(skb->len - size);
-	ip6h->daddr = *(struct in6_addr *)&x->sel.daddr.a6;
-	ip6h->saddr = *(struct in6_addr *)&x->sel.saddr.a6;
+	ip6h->daddr = x->sel.daddr.in6;
+	ip6h->saddr = x->sel.saddr.in6;
 	err = 0;
 out:
 	return err;

net/ipv6/xfrm6_policy.c

@@ -61,9 +61,7 @@ static int xfrm6_get_saddr(struct net *net,
 		return -EHOSTUNREACH;
 
 	dev = ip6_dst_idev(dst)->dev;
-	ipv6_dev_get_saddr(dev_net(dev), dev,
-			   (struct in6_addr *)&daddr->a6, 0,
-			   (struct in6_addr *)&saddr->a6);
+	ipv6_dev_get_saddr(dev_net(dev), dev, &daddr->in6, 0, &saddr->in6);
 	dst_release(dst);
 	return 0;
 }

net/key/af_key.c

@@ -709,7 +709,7 @@ static unsigned int pfkey_sockaddr_fill(const xfrm_address_t *xaddr, __be16 port
 		sin6->sin6_family = AF_INET6;
 		sin6->sin6_port = port;
 		sin6->sin6_flowinfo = 0;
-		sin6->sin6_addr = *(struct in6_addr *)xaddr->a6;
+		sin6->sin6_addr = xaddr->in6;
 		sin6->sin6_scope_id = 0;
 		return 128;
 	    }

net/xfrm/xfrm_state.c

@@ -1043,12 +1043,12 @@ static struct xfrm_state *__find_acq_core(struct net *net,
 			break;
 
 		case AF_INET6:
-			*(struct in6_addr *)x->sel.daddr.a6 = *(struct in6_addr *)daddr;
-			*(struct in6_addr *)x->sel.saddr.a6 = *(struct in6_addr *)saddr;
+			x->sel.daddr.in6 = daddr->in6;
+			x->sel.saddr.in6 = saddr->in6;
 			x->sel.prefixlen_d = 128;
 			x->sel.prefixlen_s = 128;
-			*(struct in6_addr *)x->props.saddr.a6 = *(struct in6_addr *)saddr;
-			*(struct in6_addr *)x->id.daddr.a6 = *(struct in6_addr *)daddr;
+			x->props.saddr.in6 = saddr->in6;
+			x->id.daddr.in6 = daddr->in6;
 			break;
 		}