ipv6: Move gateway checks to a fib6_nh setting
The gateway setting is not per fib6_info entry but per-fib6_nh. Add a new
fib_nh_has_gw flag to fib6_nh and convert references to RTF_GATEWAY to
the new flag. For IPv6 address the flag is cheaper than checking that
nh_gw is non-0 like IPv4 does.
While this increases fib6_nh by 8-bytes, the effective allocation size of
a fib6_info is unchanged. The 8 bytes is recovered later with a
fib_nh_common change.
Signed-off-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 5f453c7..69c96cf 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -533,7 +533,7 @@ static void rt6_probe(struct fib6_info *rt)
* Router Reachability Probe MUST be rate-limited
* to no more than one per minute.
*/
- if (!rt || !(rt->fib6_flags & RTF_GATEWAY))
+ if (!rt || !rt->fib6_nh.fib_nh_has_gw)
return;
nh_gw = &rt->fib6_nh.nh_gw;
@@ -595,7 +595,7 @@ static inline enum rt6_nud_state rt6_check_neigh(struct fib6_info *rt)
struct neighbour *neigh;
if (rt->fib6_flags & RTF_NONEXTHOP ||
- !(rt->fib6_flags & RTF_GATEWAY))
+ !rt->fib6_nh.fib_nh_has_gw)
return RT6_NUD_SUCCEED;
rcu_read_lock_bh();
@@ -784,7 +784,7 @@ static struct fib6_info *rt6_select(struct net *net, struct fib6_node *fn,
static bool rt6_is_gw_or_nonexthop(const struct fib6_info *rt)
{
- return (rt->fib6_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
+ return (rt->fib6_flags & RTF_NONEXTHOP) || rt->fib6_nh.fib_nh_has_gw;
}
#ifdef CONFIG_IPV6_ROUTE_INFO
@@ -989,8 +989,11 @@ static void ip6_rt_copy_init(struct rt6_info *rt, struct fib6_info *ort)
rt->rt6i_dst = ort->fib6_dst;
rt->rt6i_idev = dev ? in6_dev_get(dev) : NULL;
- rt->rt6i_gateway = ort->fib6_nh.nh_gw;
rt->rt6i_flags = ort->fib6_flags;
+ if (ort->fib6_nh.fib_nh_has_gw) {
+ rt->rt6i_gateway = ort->fib6_nh.nh_gw;
+ rt->rt6i_flags |= RTF_GATEWAY;
+ }
rt6_set_from(rt, ort);
#ifdef CONFIG_IPV6_SUBTREES
rt->rt6i_src = ort->fib6_src;
@@ -1872,7 +1875,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
rcu_read_unlock();
return rt;
} else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
- !(f6i->fib6_flags & RTF_GATEWAY))) {
+ !f6i->fib6_nh.fib_nh_has_gw)) {
/* Create a RTF_CACHE clone which will not be
* owned by the fib6 tree. It is for the special case where
* the daddr in the skb during the neighbor look-up is different
@@ -2442,7 +2445,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
continue;
if (rt->fib6_flags & RTF_REJECT)
break;
- if (!(rt->fib6_flags & RTF_GATEWAY))
+ if (!rt->fib6_nh.fib_nh_has_gw)
continue;
if (fl6->flowi6_oif != rt->fib6_nh.nh_dev->ifindex)
continue;
@@ -2986,6 +2989,7 @@ int fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
goto out;
fib6_nh->nh_gw = cfg->fc_gateway;
+ fib6_nh->fib_nh_has_gw = 1;
}
err = -ENODEV;
@@ -3121,7 +3125,7 @@ static struct fib6_info *ip6_route_info_create(struct fib6_config *cfg,
rt->fib6_table = table;
rt->fib6_metric = cfg->fc_metric;
rt->fib6_type = cfg->fc_type;
- rt->fib6_flags = cfg->fc_flags;
+ rt->fib6_flags = cfg->fc_flags & ~RTF_GATEWAY;
ipv6_addr_prefix(&rt->fib6_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
rt->fib6_dst.plen = cfg->fc_dst_len;
@@ -3490,7 +3494,8 @@ static struct fib6_info *rt6_get_route_info(struct net *net,
for_each_fib6_node_rt_rcu(fn) {
if (rt->fib6_nh.nh_dev->ifindex != ifindex)
continue;
- if ((rt->fib6_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
+ if (!(rt->fib6_flags & RTF_ROUTEINFO) ||
+ !rt->fib6_nh.fib_nh_has_gw)
continue;
if (!ipv6_addr_equal(&rt->fib6_nh.nh_gw, gwaddr))
continue;
@@ -3811,7 +3816,7 @@ void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
fib6_clean_all(net, fib6_remove_prefsrc, &adni);
}
-#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
+#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT)
/* Remove routers and update dst entries when gateway turn into host. */
static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
@@ -3819,6 +3824,7 @@ static int fib6_clean_tohost(struct fib6_info *rt, void *arg)
struct in6_addr *gateway = (struct in6_addr *)arg;
if (((rt->fib6_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) &&
+ rt->fib6_nh.fib_nh_has_gw &&
ipv6_addr_equal(gateway, &rt->fib6_nh.nh_gw)) {
return -1;
}
@@ -4607,7 +4613,7 @@ static int rt6_nexthop_info(struct sk_buff *skb, struct fib6_info *rt,
rcu_read_unlock();
}
- if (rt->fib6_flags & RTF_GATEWAY) {
+ if (rt->fib6_nh.fib_nh_has_gw) {
if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->fib6_nh.nh_gw) < 0)
goto nla_put_failure;
}