[PATCH 4.4 32/36] net: mpls: Pull common label check into helper

Greg Kroah-Hartman
2018-03-10T00:20:50Z

From: David Ahern <dsahern@gmail.com>

commit b7b386f42f079b25b942c756820e36c6bd09b2ca upstream.

mpls_route_add and mpls_route_del have the same checks on the label.
Move to a helper. Avoid duplicate extack messages in the next patch.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/mpls/af_mpls.c | 32 +++++++++++++++++---------------
1 file changed, 17 insertions(+), 15 deletions(-)

--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -714,6 +714,19 @@ errout:
return err;
}

+static bool mpls_label_ok(struct net *net, unsigned int index)
+{
+ /* Reserved labels may not be set */
+ if (index < MPLS_LABEL_FIRST_UNRESERVED)
+ return false;
+
+ /* The full 20 bit range may not be supported. */
+ if (index >= net->mpls.platform_labels)
+ return false;
+
+ return true;
+}
+
static int mpls_route_add(struct mpls_route_config *cfg)
{
struct mpls_route __rcu **platform_label;
@@ -732,12 +745,7 @@ static int mpls_route_add(struct mpls_ro
index = find_free_label(net);
}

- /* Reserved labels may not be set */
- if (index < MPLS_LABEL_FIRST_UNRESERVED)
- goto errout;
-
- /* The full 20 bit range may not be supported. */
- if (index >= net->mpls.platform_labels)
+ if (!mpls_label_ok(net, index))
goto errout;

/* Append makes no sense with mpls */
@@ -798,12 +806,7 @@ static int mpls_route_del(struct mpls_ro

index = cfg->rc_label;

- /* Reserved labels may not be removed */
- if (index < MPLS_LABEL_FIRST_UNRESERVED)
- goto errout;
-
- /* The full 20 bit range may not be supported */
- if (index >= net->mpls.platform_labels)
+ if (!mpls_label_ok(net, index))
goto errout;

mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
@@ -1162,10 +1165,9 @@ static int rtm_to_route_config(struct sk
&cfg->rc_label))
goto errout;

- /* Reserved labels may not be set */
- if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED)
+ if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
+ cfg->rc_label))
goto errout;
-
break;
}