ipv6: Change rt6_add_nexthop and rt6_nexthop_info to take fib6_nh

rt6_add_nexthop and rt6_nexthop_info only need the fib6_info for the
gateway flag and the nexthop weight, and the presence of a gateway is now
per-nexthop. Update the signatures to take a fib6_nh and nexthop weight
and better align with the ipv4 versions.
Signed-off-by: NDavid Ahern <dsahern@gmail.com>
Reviewed-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/route.c

@@ -4583,37 +4583,37 @@ static size_t rt6_nlmsg_size(struct fib6_info *rt)
 	       + nexthop_len;
 }
 
-static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
+static int rt6_nexthop_info(struct sk_buff *skb, const struct fib6_nh *fib6_nh,
 			    unsigned int *flags, bool skip_oif)
 {
-	if (rt->fib6_nh.nh_flags & RTNH_F_DEAD)
+	if (fib6_nh->nh_flags & RTNH_F_DEAD)
 		*flags |= RTNH_F_DEAD;
 
-	if (rt->fib6_nh.nh_flags & RTNH_F_LINKDOWN) {
+	if (fib6_nh->nh_flags & RTNH_F_LINKDOWN) {
 		*flags |= RTNH_F_LINKDOWN;
 
 		rcu_read_lock();
-		if (ip6_ignore_linkdown(rt->fib6_nh.nh_dev))
+		if (ip6_ignore_linkdown(fib6_nh->nh_dev))
 			*flags |= RTNH_F_DEAD;
 		rcu_read_unlock();
 	}
 
-	if (rt->fib6_nh.fib_nh_has_gw) {
-		if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->fib6_nh.nh_gw) < 0)
+	if (fib6_nh->fib_nh_has_gw) {
+		if (nla_put_in6_addr(skb, RTA_GATEWAY, &fib6_nh->nh_gw) < 0)
 			goto nla_put_failure;
 	}
 
-	*flags |= (rt->fib6_nh.nh_flags & RTNH_F_ONLINK);
-	if (rt->fib6_nh.nh_flags & RTNH_F_OFFLOAD)
+	*flags |= (fib6_nh->nh_flags & RTNH_F_ONLINK);
+	if (fib6_nh->nh_flags & RTNH_F_OFFLOAD)
 		*flags |= RTNH_F_OFFLOAD;
 
 	/* not needed for multipath encoding b/c it has a rtnexthop struct */
-	if (!skip_oif && rt->fib6_nh.nh_dev &&
-	    nla_put_u32(skb, RTA_OIF, rt->fib6_nh.nh_dev->ifindex))
+	if (!skip_oif && fib6_nh->nh_dev &&
+	    nla_put_u32(skb, RTA_OIF, fib6_nh->nh_dev->ifindex))
 		goto nla_put_failure;
 
-	if (rt->fib6_nh.nh_lwtstate &&
-	    lwtunnel_fill_encap(skb, rt->fib6_nh.nh_lwtstate) < 0)
+	if (fib6_nh->nh_lwtstate &&
+	    lwtunnel_fill_encap(skb, fib6_nh->nh_lwtstate) < 0)
 		goto nla_put_failure;
 
 	return 0;
@@ -4623,9 +4623,9 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
 }
 
 /* add multipath next hop */
-static int rt6_add_nexthop(struct sk_buff *skb, struct fib6_info *rt)
+static int rt6_add_nexthop(struct sk_buff *skb, const struct fib6_nh *fib6_nh)
 {
-	const struct net_device *dev = rt->fib6_nh.nh_dev;
+	const struct net_device *dev = fib6_nh->nh_dev;
 	struct rtnexthop *rtnh;
 	unsigned int flags = 0;
 
@@ -4633,10 +4633,10 @@ static int rt6_add_nexthop(struct sk_buff *skb, struct fib6_info *rt)
 	if (!rtnh)
 		goto nla_put_failure;
 
-	rtnh->rtnh_hops = rt->fib6_nh.nh_weight - 1;
+	rtnh->rtnh_hops = fib6_nh->nh_weight - 1;
 	rtnh->rtnh_ifindex = dev ? dev->ifindex : 0;
 
-	if (rt6_nexthop_info(skb, rt, &flags, true) < 0)
+	if (rt6_nexthop_info(skb, fib6_nh, &flags, true) < 0)
 		goto nla_put_failure;
 
 	rtnh->rtnh_flags = flags;
@@ -4766,18 +4766,19 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
 		if (!mp)
 			goto nla_put_failure;
 
-		if (rt6_add_nexthop(skb, rt) < 0)
+		if (rt6_add_nexthop(skb, &rt->fib6_nh) < 0)
 			goto nla_put_failure;
 
 		list_for_each_entry_safe(sibling, next_sibling,
 					 &rt->fib6_siblings, fib6_siblings) {
-			if (rt6_add_nexthop(skb, sibling) < 0)
+			if (rt6_add_nexthop(skb, &sibling->fib6_nh) < 0)
 				goto nla_put_failure;
 		}
 
 		nla_nest_end(skb, mp);
 	} else {
-		if (rt6_nexthop_info(skb, rt, &rtm->rtm_flags, false) < 0)
+		if (rt6_nexthop_info(skb, &rt->fib6_nh, &rtm->rtm_flags,
+				     false) < 0)
 			goto nla_put_failure;
 	}