[PATCH net-next] ipv6: Use result arg in fib_lookup_arg consistently

[PATCH net-next] ipv6: Use result arg in fib_lookup_arg consistently

[David Ahern]

From: David Ahern <dsahern@gmail.com>

arg.result is sometimes used as fib6_result and sometimes used to
hold the rt6_info. Add rt6_info to fib6_result and make the use
of arg.result consistent through ipv6 rules.

The rt6 entry is filled in for lookups returning a dst_entry, but not
for direct fib_lookups that just want a fib6_info.

Fixes: effda4dd97e8 ("ipv6: Pass fib6_result to fib lookups")
Signed-off-by: David Ahern <dsahern@gmail.com>
---
 include/net/ip6_fib.h |  1 +
 net/ipv6/fib6_rules.c | 15 +++++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/include/net/ip6_fib.h b/include/net/ip6_fib.h
index 352f767bea81..8a569101bd14 100644
--- a/include/net/ip6_fib.h
+++ b/include/net/ip6_fib.h
@@ -195,6 +195,7 @@ struct fib6_result {
 	struct fib6_info	*f6i;
 	u32			fib6_flags;
 	u8			fib6_type;
+	struct rt6_info		*rt6;
 };
 
 #define for_each_fib6_node_rt_rcu(fn)					\
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c
index ab5ac643bae8..8c62badfa2f3 100644
--- a/net/ipv6/fib6_rules.c
+++ b/net/ipv6/fib6_rules.c
@@ -94,9 +94,11 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
 				   int flags, pol_lookup_t lookup)
 {
 	if (net->ipv6.fib6_has_custom_rules) {
+		struct fib6_result res = {};
 		struct fib_lookup_arg arg = {
 			.lookup_ptr = lookup,
 			.lookup_data = skb,
+			.result = &res,
 			.flags = FIB_LOOKUP_NOREF,
 		};
 
@@ -106,8 +108,8 @@ struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
 		fib_rules_lookup(net->ipv6.fib6_rules_ops,
 				 flowi6_to_flowi(fl6), flags, &arg);
 
-		if (arg.result)
-			return arg.result;
+		if (res.rt6)
+			return &res.rt6->dst;
 	} else {
 		struct rt6_info *rt;
 
@@ -189,6 +191,7 @@ static int fib6_rule_action_alt(struct fib_rule *rule, struct flowi *flp,
 static int __fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
 			      int flags, struct fib_lookup_arg *arg)
 {
+	struct fib6_result *res = arg->result;
 	struct flowi6 *flp6 = &flp->u.ip6;
 	struct rt6_info *rt = NULL;
 	struct fib6_table *table;
@@ -243,7 +246,7 @@ static int __fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
 discard_pkt:
 	dst_hold(&rt->dst);
 out:
-	arg->result = rt;
+	res->rt6 = rt;
 	return err;
 }
 
@@ -258,9 +261,13 @@ static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
 
 static bool fib6_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
 {
-	struct rt6_info *rt = (struct rt6_info *) arg->result;
+	struct fib6_result *res = arg->result;
+	struct rt6_info *rt = res->rt6;
 	struct net_device *dev = NULL;
 
+	if (!rt)
+		return false;
+
 	if (rt->rt6i_idev)
 		dev = rt->rt6i_idev->dev;
 
-- 
2.11.0

Re: [PATCH net-next] ipv6: Use result arg in fib_lookup_arg consistently

[David Miller]

From: David Ahern <dsahern@kernel.org>
Date: Tue, 23 Apr 2019 18:05:33 -0700

> From: David Ahern <dsahern@gmail.com>
> 
> arg.result is sometimes used as fib6_result and sometimes used to
> hold the rt6_info. Add rt6_info to fib6_result and make the use
> of arg.result consistent through ipv6 rules.
> 
> The rt6 entry is filled in for lookups returning a dst_entry, but not
> for direct fib_lookups that just want a fib6_info.
> 
> Fixes: effda4dd97e8 ("ipv6: Pass fib6_result to fib lookups")
> Signed-off-by: David Ahern <dsahern@gmail.com>

Applied.