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fib_rules: add route suppression based on ifgroup

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This change adds the ability to suppress a routing decision based upon the
interface group the selected interface belongs to. This allows it to
exclude specific devices from a routing decision.

Signed-off-by: Stefan Tomanek <stefan.tomanek@wertarbyte.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Tomanek
2013-08-02 17:19:56 +02:00
committed by David S. Miller
parent d1c53c8e87
commit 6ef94cfafb
5 changed files with 43 additions and 10 deletions
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23
net/ipv4/fib_rules.c
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@@ -103,16 +103,27 @@ errout:
static bool fib4_rule_suppress(struct fib_rule *rule, struct fib_lookup_arg *arg)
{
struct fib_result *result = (struct fib_result *) arg->result;
struct net_device *dev = result->fi->fib_dev;
/* do not accept result if the route does
* not meet the required prefix length
*/
struct fib_result *result = (struct fib_result *) arg->result;
if (result->prefixlen < rule->table_prefixlen_min) {
if (!(arg->flags & FIB_LOOKUP_NOREF))
fib_info_put(result->fi);
return true;
}
if (result->prefixlen < rule->table_prefixlen_min)
goto suppress_route;
/* do not accept result if the route uses a device
* belonging to a forbidden interface group
*/
if (rule->suppress_ifgroup != -1 && dev && dev->group == rule->suppress_ifgroup)
goto suppress_route;
return false;
suppress_route:
if (!(arg->flags & FIB_LOOKUP_NOREF))
fib_info_put(result->fi);
return true;
}
static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)