s390/qeth: extract helpers for next-hop lookup

These will be used in a subsequent patch.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 7 deletions

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 3d8b8e0f2438..6b0d37d2c638 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -34,6 +34,7 @@
 #include <net/ipv6.h>
 #include <net/if_inet6.h>
 #include <net/addrconf.h>
+#include <net/route.h>
 #include <net/sch_generic.h>
 #include <net/tcp.h>
 
@@ -234,11 +235,7 @@ struct qeth_hdr_layer3 {
 	__u16 frame_offset;
 	union {
 		/* TX: */
-		struct in6_addr ipv6_addr;
-		struct ipv4 {
-			u8 res[12];
-			u32 addr;
-		} ipv4;
+		struct in6_addr addr;
 		/* RX: */
 		struct rx {
 			u8 res1[2];
@@ -355,8 +352,7 @@ static inline bool qeth_l3_same_next_hop(struct qeth_hdr_layer3 *h1,
 					 struct qeth_hdr_layer3 *h2)
 {
 	return !((h1->flags ^ h2->flags) & QETH_HDR_IPV6) &&
-	       ipv6_addr_equal(&h1->next_hop.ipv6_addr,
-			       &h2->next_hop.ipv6_addr);
+	       ipv6_addr_equal(&h1->next_hop.addr, &h2->next_hop.addr);
 }
 
 struct qeth_local_addr {
@@ -945,6 +941,25 @@ static inline struct dst_entry *qeth_dst_check_rcu(struct sk_buff *skb, int ipv)
 	return dst;
 }
 
+static inline __be32 qeth_next_hop_v4_rcu(struct sk_buff *skb,
+					  struct dst_entry *dst)
+{
+	struct rtable *rt = (struct rtable *) dst;
+
+	return (rt) ? rt_nexthop(rt, ip_hdr(skb)->daddr) : ip_hdr(skb)->daddr;
+}
+
+static inline struct in6_addr *qeth_next_hop_v6_rcu(struct sk_buff *skb,
+						    struct dst_entry *dst)
+{
+	struct rt6_info *rt = (struct rt6_info *) dst;
+
+	if (rt && !ipv6_addr_any(&rt->rt6i_gateway))
+		return &rt->rt6i_gateway;
+	else
+		return &ipv6_hdr(skb)->daddr;
+}
+
 static inline void qeth_tx_csum(struct sk_buff *skb, u8 *flags, int ipv)
 {
 	*flags |= QETH_HDR_EXT_CSUM_TRANSP_REQ;