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>

include/net/pkt_cls.h

@@ -416,7 +416,7 @@ tcf_exts_exec(struct sk_buff *skb, struct tcf_exts *exts,
 
 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 tcf_exts *exts, bool ovr, bool rtnl_held,
 		      struct netlink_ext_ack *extack);
 void tcf_exts_destroy(struct tcf_exts *exts);
 void tcf_exts_change(struct tcf_exts *dst, struct tcf_exts *src);

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;

net/sched/cls_basic.c

@@ -153,7 +153,7 @@ static int basic_set_parms(struct net *net, struct tcf_proto *tp,
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
+	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, true, extack);
 	if (err < 0)
 		return err;
 

net/sched/cls_bpf.c

@@ -417,7 +417,8 @@ static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp,
 	if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))
 		return -EINVAL;
 
-	ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, extack);
+	ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, true,
+				extack);
 	if (ret < 0)
 		return ret;
 

net/sched/cls_cgroup.c

@@ -110,7 +110,7 @@ static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb,
 		goto errout;
 
 	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, ovr,
-				extack);
+				true, extack);
 	if (err < 0)
 		goto errout;
 

net/sched/cls_flow.c

@@ -445,7 +445,7 @@ static int flow_change(struct net *net, struct sk_buff *in_skb,
 		goto err2;
 
 	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, ovr,
-				extack);
+				true, extack);
 	if (err < 0)
 		goto err2;
 

net/sched/cls_flower.c

@@ -1272,7 +1272,8 @@ static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
+	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, true,
+				extack);
 	if (err < 0)
 		return err;
 

net/sched/cls_fw.c

@@ -217,7 +217,7 @@ static int fw_set_parms(struct net *net, struct tcf_proto *tp,
 	int err;
 
 	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
-				extack);
+				true, extack);
 	if (err < 0)
 		return err;
 

net/sched/cls_matchall.c

@@ -145,7 +145,8 @@ static int mall_set_parms(struct net *net, struct tcf_proto *tp,
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, extack);
+	err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, true,
+				extack);
 	if (err < 0)
 		return err;
 

net/sched/cls_route.c

@@ -393,7 +393,7 @@ static int route4_set_parms(struct net *net, struct tcf_proto *tp,
 	struct route4_bucket *b;
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
+	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, true, extack);
 	if (err < 0)
 		return err;
 

net/sched/cls_rsvp.h

@@ -502,7 +502,8 @@ static int rsvp_change(struct net *net, struct sk_buff *in_skb,
 	err = tcf_exts_init(&e, TCA_RSVP_ACT, TCA_RSVP_POLICE);
 	if (err < 0)
 		return err;
-	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr, extack);
+	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr, true,
+				extack);
 	if (err < 0)
 		goto errout2;
 

net/sched/cls_tcindex.c

@@ -314,7 +314,7 @@ tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 	err = tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
 	if (err < 0)
 		return err;
-	err = tcf_exts_validate(net, tp, tb, est, &e, ovr, extack);
+	err = tcf_exts_validate(net, tp, tb, est, &e, ovr, true, extack);
 	if (err < 0)
 		goto errout;
 

net/sched/cls_u32.c

@@ -726,7 +726,7 @@ static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
+	err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, true, extack);
 	if (err < 0)
 		return err;