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>

13 files changed, 21 insertions, 16 deletions

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index e5dafa5ee1b2..0e3b61016931 100644
--- a/include/net/pkt_cls.h
+++ b/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);
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;
diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index 4a57fec6f306..eaf9c02fe792 100644
--- a/net/sched/cls_basic.c
+++ b/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;
 
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index a95cb240a606..656b3423ad35 100644
--- a/net/sched/cls_bpf.c
+++ b/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;
 
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 3bc01bdde165..663ee1c6d606 100644
--- a/net/sched/cls_cgroup.c
+++ b/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;
 
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 2bb043cd436b..39a6407d4832 100644
--- a/net/sched/cls_flow.c
+++ b/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;
 
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 6a341287a527..5e3f74ab68ca 100644
--- a/net/sched/cls_flower.c
+++ b/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;
 
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index 29eeeaf3ea44..c8173ebb69f2 100644
--- a/net/sched/cls_fw.c
+++ b/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;
 
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index a1b803fd372e..8848a147c4bf 100644
--- a/net/sched/cls_matchall.c
+++ b/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;
 
diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index 0404aa5fa7cb..44b26038c4c4 100644
--- a/net/sched/cls_route.c
+++ b/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;
 
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index e9ccf7daea7d..9dd9530e6a52 100644
--- a/net/sched/cls_rsvp.h
+++ b/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;
 
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index 9ccc93f257db..b7dc667b6ec0 100644
--- a/net/sched/cls_tcindex.c
+++ b/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;
 
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index dcea21004604..e891f30d42e9 100644
--- a/net/sched/cls_u32.c
+++ b/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;