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authorHoratiu Vultur <horatiu.vultur@microchip.com>2020-05-22 02:19:05 +0300
committerDavid S. Miller <davem@davemloft.net>2020-05-23 02:17:15 +0300
commit7aa38018be1fa4cff3e631f26bc821086ba90d29 (patch)
tree74030ab0a9bb5b3da26d958f7f18adf32ec2cad8 /net/bridge
parenta74707396c9185cbbca0ae0a115b95b5a8b6bfa1 (diff)
downloadlinux-7aa38018be1fa4cff3e631f26bc821086ba90d29.tar.xz
bridge: mrp: Add br_mrp_unique_ifindex function
It is not allow to have the same net bridge port part of multiple MRP rings. Therefore add a check if the port is used already in a different MRP. In that case return failure. Fixes: 9a9f26e8f7ea ("bridge: mrp: Connect MRP API with the switchdev API") Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/bridge')
-rw-r--r--net/bridge/br_mrp.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/net/bridge/br_mrp.c b/net/bridge/br_mrp.c
index d7bc09de4c13..854e31bf0151 100644
--- a/net/bridge/br_mrp.c
+++ b/net/bridge/br_mrp.c
@@ -37,6 +37,26 @@ static struct br_mrp *br_mrp_find_id(struct net_bridge *br, u32 ring_id)
return res;
}
+static bool br_mrp_unique_ifindex(struct net_bridge *br, u32 ifindex)
+{
+ struct br_mrp *mrp;
+
+ list_for_each_entry_rcu(mrp, &br->mrp_list, list,
+ lockdep_rtnl_is_held()) {
+ struct net_bridge_port *p;
+
+ p = rtnl_dereference(mrp->p_port);
+ if (p && p->dev->ifindex == ifindex)
+ return false;
+
+ p = rtnl_dereference(mrp->s_port);
+ if (p && p->dev->ifindex == ifindex)
+ return false;
+ }
+
+ return true;
+}
+
static struct br_mrp *br_mrp_find_port(struct net_bridge *br,
struct net_bridge_port *p)
{
@@ -255,6 +275,11 @@ int br_mrp_add(struct net_bridge *br, struct br_mrp_instance *instance)
!br_mrp_get_port(br, instance->s_ifindex))
return -EINVAL;
+ /* It is not possible to have the same port part of multiple rings */
+ if (!br_mrp_unique_ifindex(br, instance->p_ifindex) ||
+ !br_mrp_unique_ifindex(br, instance->s_ifindex))
+ return -EINVAL;
+
mrp = kzalloc(sizeof(*mrp), GFP_KERNEL);
if (!mrp)
return -ENOMEM;