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[NET] rules: Add support to invert selectors 

Introduces a new flag FIB_RULE_INVERT causing rules to apply
if the specified selector doesn't match.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2006-11-09 15:23:20 -08:00 committed by David S. Miller
parent 1f6c9557e8
commit 3dfbcc411e
2 changed files with 18 additions and 7 deletions
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1
include/linux/fib_rules.h
View File

@ -6,6 +6,7 @@
/* rule is permanent, and cannot be deleted */
#define FIB_RULE_PERMANENT 1
#define FIB_RULE_INVERT 2
struct fib_rule_hdr
{

24
net/core/fib_rules.c
View File

@ -107,6 +107,22 @@ int fib_rules_unregister(struct fib_rules_ops *ops)
EXPORT_SYMBOL_GPL(fib_rules_unregister);
static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
struct flowi *fl, int flags)
{
int ret = 0;
if (rule->ifindex && (rule->ifindex != fl->iif))
goto out;
if ((rule->mark ^ fl->mark) & rule->mark_mask)
goto out;
ret = ops->match(rule, fl, flags);
out:
return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
}
int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
int flags, struct fib_lookup_arg *arg)
{
@ -116,13 +132,7 @@ int fib_rules_lookup(struct fib_rules_ops *ops, struct flowi *fl,
rcu_read_lock();
list_for_each_entry_rcu(rule, ops->rules_list, list) {
if (rule->ifindex && (rule->ifindex != fl->iif))
continue;
if ((rule->mark ^ fl->mark) & rule->mark_mask)
continue;
if (!ops->match(rule, fl, flags))
if (!fib_rule_match(rule, ops, fl, flags))
continue;
err = ops->action(rule, fl, flags, arg);