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net: mpls: Pull common label check into helper 

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>
This commit is contained in:
David Ahern 2017-05-27 16:19:30 -06:00 committed by David S. Miller
parent a1f10abe12
commit b7b386f42f
1 changed files with 17 additions and 15 deletions
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32
net/mpls/af_mpls.c
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@ -856,6 +856,19 @@ errout:
return err; 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) static int mpls_route_add(struct mpls_route_config *cfg)
{ {
struct mpls_route __rcu **platform_label; struct mpls_route __rcu **platform_label;
@ -875,12 +888,7 @@ static int mpls_route_add(struct mpls_route_config *cfg)
index = find_free_label(net); index = find_free_label(net);
} }
/* Reserved labels may not be set */ if (!mpls_label_ok(net, index))
if (index < MPLS_LABEL_FIRST_UNRESERVED)
goto errout;
/* The full 20 bit range may not be supported. */
if (index >= net->mpls.platform_labels)
goto errout; goto errout;
/* Append makes no sense with mpls */ /* Append makes no sense with mpls */
@ -952,12 +960,7 @@ static int mpls_route_del(struct mpls_route_config *cfg)
index = cfg->rc_label; index = cfg->rc_label;
/* Reserved labels may not be removed */ if (!mpls_label_ok(net, index))
if (index < MPLS_LABEL_FIRST_UNRESERVED)
goto errout;
/* The full 20 bit range may not be supported */
if (index >= net->mpls.platform_labels)
goto errout; goto errout;
mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); mpls_route_update(net, index, NULL, &cfg->rc_nlinfo);
@ -1735,10 +1738,9 @@ static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh,
&cfg->rc_label, NULL)) &cfg->rc_label, NULL))
goto errout; goto errout;
/* Reserved labels may not be set */ if (!mpls_label_ok(cfg->rc_nlinfo.nl_net,
if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED) cfg->rc_label))
goto errout; goto errout;
break; break;
} }
case RTA_VIA: case RTA_VIA: