net: Add fib_nh_common and update fib_nh and fib6_nh

Add fib_nh_common struct with common nexthop attributes. Convert
fib_nh and fib6_nh to use it. Use macros to move existing
fib_nh_* references to the new nh_common.nhc_*.
Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip6_fib.h

@@ -19,6 +19,7 @@
 #include <linux/notifier.h>
 #include <net/dst.h>
 #include <net/flow.h>
+#include <net/ip_fib.h>
 #include <net/netlink.h>
 #include <net/inetpeer.h>
 #include <net/fib_notifier.h>
@@ -125,14 +126,7 @@ struct rt6_exception {
 #define FIB6_MAX_DEPTH 5
 
 struct fib6_nh {
-	struct in6_addr		fib_nh_gw6;
-	bool			fib_nh_has_gw;
-	struct net_device	*fib_nh_dev;
-	struct lwtunnel_state	*fib_nh_lws;
-
-	unsigned int		fib_nh_flags;
-	atomic_t		fib_nh_upper_bound;
-	int			fib_nh_weight;
+	struct fib_nh_common	nh_common;
 };
 
 struct fib6_info {

include/net/ip_fib.h

@@ -76,27 +76,48 @@ struct fnhe_hash_bucket {
 #define FNHE_HASH_SIZE		(1 << FNHE_HASH_SHIFT)
 #define FNHE_RECLAIM_DEPTH	5
 
+struct fib_nh_common {
+	struct net_device	*nhc_dev;
+	int			nhc_oif;
+	unsigned int		nhc_flags;
+	struct lwtunnel_state	*nhc_lwtstate;
+	unsigned char		nhc_scope;
+	u8			nhc_family;
+	u8			nhc_has_gw:1,
+				unused:7;
+	union {
+		__be32          ipv4;
+		struct in6_addr ipv6;
+	} nhc_gw;
+
+	int			nhc_weight;
+	atomic_t		nhc_upper_bound;
+};
+
 struct fib_nh {
-	struct net_device	*fib_nh_dev;
+	struct fib_nh_common	nh_common;
 	struct hlist_node	nh_hash;
 	struct fib_info		*nh_parent;
-	unsigned int		fib_nh_flags;
-	unsigned char		fib_nh_scope;
-#ifdef CONFIG_IP_ROUTE_MULTIPATH
-	int			fib_nh_weight;
-	atomic_t		fib_nh_upper_bound;
-#endif
 #ifdef CONFIG_IP_ROUTE_CLASSID
 	__u32			nh_tclassid;
 #endif
-	int			fib_nh_oif;
-	__be32			fib_nh_gw4;
 	__be32			nh_saddr;
 	int			nh_saddr_genid;
 	struct rtable __rcu * __percpu *nh_pcpu_rth_output;
 	struct rtable __rcu	*nh_rth_input;
 	struct fnhe_hash_bucket	__rcu *nh_exceptions;
-	struct lwtunnel_state	*fib_nh_lws;
+#define fib_nh_family		nh_common.nhc_family
+#define fib_nh_dev		nh_common.nhc_dev
+#define fib_nh_oif		nh_common.nhc_oif
+#define fib_nh_flags		nh_common.nhc_flags
+#define fib_nh_lws		nh_common.nhc_lwtstate
+#define fib_nh_scope		nh_common.nhc_scope
+#define fib_nh_family		nh_common.nhc_family
+#define fib_nh_has_gw		nh_common.nhc_has_gw
+#define fib_nh_gw4		nh_common.nhc_gw.ipv4
+#define fib_nh_gw6		nh_common.nhc_gw.ipv6
+#define fib_nh_weight		nh_common.nhc_weight
+#define fib_nh_upper_bound	nh_common.nhc_upper_bound
 };
 
 /*

net/ipv4/fib_semantics.c

@@ -468,6 +468,8 @@ int fib_nh_init(struct net *net, struct fib_nh *nh,
 {
 	int err = -ENOMEM;
 
+	nh->fib_nh_family = AF_INET;
+
 	nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *);
 	if (!nh->nh_pcpu_rth_output)
 		goto err_out;
@@ -490,7 +492,10 @@ int fib_nh_init(struct net *net, struct fib_nh *nh,
 	}
 
 	nh->fib_nh_oif = cfg->fc_oif;
-	nh->fib_nh_gw4 = cfg->fc_gw;
+	if (cfg->fc_gw) {
+		nh->fib_nh_gw4 = cfg->fc_gw;
+		nh->fib_nh_has_gw = 1;
+	}
 	nh->fib_nh_flags = cfg->fc_flags;
 
 #ifdef CONFIG_IP_ROUTE_CLASSID

net/ipv6/route.c

@@ -2906,6 +2906,8 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
 	int addr_type;
 	int err;
 
+	fib6_nh->fib_nh_family = AF_INET6;
+
 	err = -ENODEV;
 	if (cfg->fc_ifindex) {
 		dev = dev_get_by_index(net, cfg->fc_ifindex);
@@ -2999,6 +3001,7 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
 
 set_dev:
 	fib6_nh->fib_nh_dev = dev;
+	fib6_nh->fib_nh_oif = dev->ifindex;
 	err = 0;
 out:
 	if (idev)