ipv6: Rename fib6_multipath_select and pass fib6_result

Add 'struct fib6_result' to hold the fib entry and fib6_nh from a fib
lookup as separate entries, similar to what IPv4 now has with fib_result.

Rename fib6_multipath_select to fib6_select_path, pass fib6_result to
it, and set f6i and nh in the result once a path selection is done.
Call fib6_select_path unconditionally for path selection which means
moving the sibling and oif check to fib6_select_path. To handle the two
different call paths (2 only call multipath_select if flowi6_oif == 0 and
the other always calls it), add a new have_oif_match that controls the
sibling walk if relevant.

Update callers of fib6_multipath_select accordingly and have them use the
fib6_info and fib6_nh from the result.

This is needed for multipath nexthop objects where a single f6i can
point to multiple fib6_nh (similar to IPv4).

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 39 insertions, 37 deletions

diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index e37e4c5871f7..b11fa0aa18a0 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -158,12 +158,11 @@ eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
 	return NULL;
 }
 
-static struct fib6_info *
-eafnosupport_fib6_multipath_select(const struct net *net, struct fib6_info *f6i,
-				   struct flowi6 *fl6, int oif,
-				   const struct sk_buff *skb, int strict)
+static void
+eafnosupport_fib6_select_path(const struct net *net, struct fib6_result *res,
+			      struct flowi6 *fl6, int oif, bool have_oif_match,
+			      const struct sk_buff *skb, int strict)
 {
-	return f6i;
 }
 
 static u32
@@ -187,7 +186,7 @@ const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
 	.fib6_get_table    = eafnosupport_fib6_get_table,
 	.fib6_table_lookup = eafnosupport_fib6_table_lookup,
 	.fib6_lookup       = eafnosupport_fib6_lookup,
-	.fib6_multipath_select = eafnosupport_fib6_multipath_select,
+	.fib6_select_path  = eafnosupport_fib6_select_path,
 	.ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
 	.fib6_nh_init	   = eafnosupport_fib6_nh_init,
 };
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 1dac6ea6666a..d8587ca4fbeb 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -917,7 +917,7 @@ static const struct ipv6_stub ipv6_stub_impl = {
 	.fib6_get_table	   = fib6_get_table,
 	.fib6_table_lookup = fib6_table_lookup,
 	.fib6_lookup       = fib6_lookup,
-	.fib6_multipath_select = fib6_multipath_select,
+	.fib6_select_path  = fib6_select_path,
 	.ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
 	.fib6_nh_init	   = fib6_nh_init,
 	.fib6_nh_release   = fib6_nh_release,
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 9ece8067a59b..0ad77b62da7c 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -428,13 +428,15 @@ static bool rt6_check_expired(const struct rt6_info *rt)
 	return false;
 }
 
-struct fib6_info *fib6_multipath_select(const struct net *net,
-					struct fib6_info *match,
-					struct flowi6 *fl6, int oif,
-					const struct sk_buff *skb,
-					int strict)
+void fib6_select_path(const struct net *net, struct fib6_result *res,
+		      struct flowi6 *fl6, int oif, bool have_oif_match,
+		      const struct sk_buff *skb, int strict)
 {
 	struct fib6_info *sibling, *next_sibling;
+	struct fib6_info *match = res->f6i;
+
+	if (!match->fib6_nsiblings || have_oif_match)
+		goto out;
 
 	/* We might have already computed the hash for ICMPv6 errors. In such
 	 * case it will always be non-zero. Otherwise now is the time to do it.
@@ -443,7 +445,7 @@ struct fib6_info *fib6_multipath_select(const struct net *net,
 		fl6->mp_hash = rt6_multipath_hash(net, fl6, skb, NULL);
 
 	if (fl6->mp_hash <= atomic_read(&match->fib6_nh.fib_nh_upper_bound))
-		return match;
+		goto out;
 
 	list_for_each_entry_safe(sibling, next_sibling, &match->fib6_siblings,
 				 fib6_siblings) {
@@ -459,7 +461,9 @@ struct fib6_info *fib6_multipath_select(const struct net *net,
 		break;
 	}
 
-	return match;
+out:
+	res->f6i = match;
+	res->nh = &match->fib6_nh;
 }
 
 /*
@@ -1063,7 +1067,7 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 					     const struct sk_buff *skb,
 					     int flags)
 {
-	struct fib6_info *f6i;
+	struct fib6_result res = {};
 	struct fib6_node *fn;
 	struct rt6_info *rt;
 
@@ -1073,14 +1077,14 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net,
 	rcu_read_lock();
 	fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
 restart:
-	f6i = rcu_dereference(fn->leaf);
-	if (!f6i)
-		f6i = net->ipv6.fib6_null_entry;
+	res.f6i = rcu_dereference(fn->leaf);
+	if (!res.f6i)
+		res.f6i = net->ipv6.fib6_null_entry;
 	else
-		f6i = rt6_device_match(net, f6i, &fl6->saddr,
-				      fl6->flowi6_oif, flags);
+		res.f6i = rt6_device_match(net, res.f6i, &fl6->saddr,
+					   fl6->flowi6_oif, flags);
 
-	if (f6i == net->ipv6.fib6_null_entry) {
+	if (res.f6i == net->ipv6.fib6_null_entry) {
 		fn = fib6_backtrack(fn, &fl6->saddr);
 		if (fn)
 			goto restart;
@@ -1090,20 +1094,20 @@ restart:
 		goto out;
 	}
 
-	if (f6i->fib6_nsiblings && fl6->flowi6_oif == 0)
-		f6i = fib6_multipath_select(net, f6i, fl6, fl6->flowi6_oif, skb,
-					    flags);
+	fib6_select_path(net, &res, fl6, fl6->flowi6_oif,
+			 fl6->flowi6_oif != 0, skb, flags);
+
 	/* Search through exception table */
-	rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
+	rt = rt6_find_cached_rt(res.f6i, &fl6->daddr, &fl6->saddr);
 	if (rt) {
 		if (ip6_hold_safe(net, &rt))
 			dst_use_noref(&rt->dst, jiffies);
 	} else {
-		rt = ip6_create_rt_rcu(f6i);
+		rt = ip6_create_rt_rcu(res.f6i);
 	}
 
 out:
-	trace_fib6_table_lookup(net, f6i, table, fl6);
+	trace_fib6_table_lookup(net, res.f6i, table, fl6);
 
 	rcu_read_unlock();
 
@@ -1843,7 +1847,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 			       int oif, struct flowi6 *fl6,
 			       const struct sk_buff *skb, int flags)
 {
-	struct fib6_info *f6i;
+	struct fib6_result res = {};
 	struct rt6_info *rt;
 	int strict = 0;
 
@@ -1854,19 +1858,18 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 
 	rcu_read_lock();
 
-	f6i = fib6_table_lookup(net, table, oif, fl6, strict);
-	if (f6i == net->ipv6.fib6_null_entry) {
+	res.f6i = fib6_table_lookup(net, table, oif, fl6, strict);
+	if (res.f6i == net->ipv6.fib6_null_entry) {
 		rt = net->ipv6.ip6_null_entry;
 		rcu_read_unlock();
 		dst_hold(&rt->dst);
 		return rt;
 	}
 
-	if (f6i->fib6_nsiblings)
-		f6i = fib6_multipath_select(net, f6i, fl6, oif, skb, strict);
+	fib6_select_path(net, &res, fl6, oif, false, skb, strict);
 
 	/*Search through exception table */
-	rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
+	rt = rt6_find_cached_rt(res.f6i, &fl6->daddr, &fl6->saddr);
 	if (rt) {
 		if (ip6_hold_safe(net, &rt))
 			dst_use_noref(&rt->dst, jiffies);
@@ -1874,7 +1877,7 @@ 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_nh.fib_nh_gw_family)) {
+			    !res.nh->fib_nh_gw_family)) {
 		/* 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
@@ -1882,7 +1885,7 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 		 */
 		struct rt6_info *uncached_rt;
 
-		uncached_rt = ip6_rt_cache_alloc(f6i, &fl6->daddr, NULL);
+		uncached_rt = ip6_rt_cache_alloc(res.f6i, &fl6->daddr, NULL);
 
 		rcu_read_unlock();
 
@@ -1904,10 +1907,10 @@ struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
 		struct rt6_info *pcpu_rt;
 
 		local_bh_disable();
-		pcpu_rt = rt6_get_pcpu_route(f6i);
+		pcpu_rt = rt6_get_pcpu_route(res.f6i);
 
 		if (!pcpu_rt)
-			pcpu_rt = rt6_make_pcpu_route(net, f6i);
+			pcpu_rt = rt6_make_pcpu_route(net, res.f6i);
 
 		local_bh_enable();
 		rcu_read_unlock();