4.4-stable review patch. If anyone has any objections, please let me know.
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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; } case RTA_VIA: