Re: [patch net-next v2 1/9] net: fib_rules: Check if selector matches all packets

On Wed, Mar 15, 2017 at 09:15:43AM -0600, David Ahern wrote:

On 3/15/17 5:05 AM, Jiri Pirko wrote:

quoted

diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index b6791d9..4ed475d 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c

@@ -23,6 +23,20 @@ static const struct fib_kuid_range fib_kuid_range_unset = {
 	KUIDT_INIT(~0),
 };
 
+bool fib_rule_matchall(const struct fib_rule *rule)
+{
+	if (rule->iifindex || rule->oifindex || rule->mark || rule->l3mdev ||

l3mdev should not be in that list. Setting l3mdev is functionally
equivalent to setting rule->table. The difference is that l3mdev means
go get the table from the device. It has no bearing on a 'matchall' intent.

Good idea. Will drop this and the last patch.

quoted

+	    rule->tun_id || rule->flags)
+		return false;
+	if (rule->suppress_ifgroup != -1 || rule->suppress_prefixlen != -1)
+		return false;
+	if (!uid_eq(rule->uid_range.start, fib_kuid_range_unset.start) ||
+	    !uid_eq(rule->uid_range.end, fib_kuid_range_unset.end))
+		return false;
+	return true;
+}
+EXPORT_SYMBOL_GPL(fib_rule_matchall);
+
 int fib_default_rule_add(struct fib_rules_ops *ops,
 			 u32 pref, u32 table, u32 flags)
 {

diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 2892109..7a941a5 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c

@@ -47,6 +47,16 @@ struct fib4_rule {
 #endif
 };
 
+bool fib4_rule_matchall(const struct fib_rule *rule)
+{
+	struct fib4_rule *r = (struct fib4_rule *) rule;

Use container_of instead of typecast.

There are multiple conversions from 'fib_rule' to 'fib4_rule' in this
file, all use typecast.

Thanks David.