net: sched: track rtnl lock status when validating extensions

Actions API is already updated to not rely on rtnl lock for
synchronization. However, it need to be provided with rtnl status when
called from classifiers API in order to be able to correctly release the
lock when loading kernel module.

Extend extension validation function with 'rtnl_held' flag which is passed
to actions API. Add new 'rtnl_held' parameter to tcf_exts_validate() in cls
API. No classifier is currently updated to support unlocked execution, so
pass hardcoded 'true' flag parameter value.

Signed-off-by: Vlad Buslov <vladbu@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 4 deletions

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 3038a82f6591..a3e715d34efb 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -2841,7 +2841,7 @@ EXPORT_SYMBOL(tcf_exts_destroy);
 
 int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
                       struct nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
-                      struct netlink_ext_ack *extack)
+                      bool rtnl_held, struct netlink_ext_ack *extack)
 {
 #ifdef CONFIG_NET_CLS_ACT
         {
@@ -2851,7 +2851,8 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
                 if (exts->police && tb[exts->police]) {
                         act = tcf_action_init_1(net, tp, tb[exts->police],
                                                 rate_tlv, "police", ovr,
-                                                TCA_ACT_BIND, true, extack);
+                                                TCA_ACT_BIND, rtnl_held,
+                                                extack);
                         if (IS_ERR(act))
                                 return PTR_ERR(act);
 
@@ -2863,8 +2864,8 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 
                         err = tcf_action_init(net, tp, tb[exts->action],
                                               rate_tlv, NULL, ovr, TCA_ACT_BIND,
-                                              exts->actions, &attr_size, true,
-                                              extack);
+                                              exts->actions, &attr_size,
+                                              rtnl_held, extack);
                         if (err < 0)
                                 return err;
                         exts->nr_actions = err;