net: sched: cls: add extack support for tcf_exts_validate

The tcf_exts_validate function calls the act api change callback. For
preparing extack support for act api, this patch adds the extack as
parameter for this function which is common used in cls implementations.

Furthermore the tcf_exts_validate will call action init callback which
prepares the TC action subsystem for extack support.

Cc: David Ahern <dsahern@gmail.com>
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

13 files changed, 50 insertions, 32 deletions

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 789d818c4a61..6dd009e10e5d 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -376,7 +376,8 @@ 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,
+		      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);
 int tcf_exts_dump(struct sk_buff *skb, struct tcf_exts *exts);
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 06797c2e8102..f365970dc68c 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -1423,7 +1423,8 @@ void tcf_exts_destroy(struct tcf_exts *exts)
 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 nlattr *rate_tlv, struct tcf_exts *exts, bool ovr,
+		      struct netlink_ext_ack *extack)
 {
 #ifdef CONFIG_NET_CLS_ACT
 	{
@@ -1456,8 +1457,10 @@ int tcf_exts_validate(struct net *net, struct tcf_proto *tp, struct nlattr **tb,
 	}
 #else
 	if ((exts->action && tb[exts->action]) ||
-	    (exts->police && tb[exts->police]))
+	    (exts->police && tb[exts->police])) {
+		NL_SET_ERR_MSG(extack, "Classifier actions are not supported per compile options (CONFIG_NET_CLS_ACT)");
 		return -EOPNOTSUPP;
+	}
 #endif
 
 	return 0;
diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index 2cc38cd71938..b7bcf67641bf 100644
--- a/net/sched/cls_basic.c
+++ b/net/sched/cls_basic.c
@@ -152,11 +152,12 @@ static const struct nla_policy basic_policy[TCA_BASIC_MAX + 1] = {
 static int basic_set_parms(struct net *net, struct tcf_proto *tp,
 			   struct basic_filter *f, unsigned long base,
 			   struct nlattr **tb,
-			   struct nlattr *est, bool ovr)
+			   struct nlattr *est, bool ovr,
+			   struct netlink_ext_ack *extack)
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
+	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
 	if (err < 0)
 		return err;
 
@@ -222,7 +223,8 @@ static int basic_change(struct net *net, struct sk_buff *in_skb,
 		fnew->handle = idr_index;
 	}
 
-	err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr);
+	err = basic_set_parms(net, tp, fnew, base, tb, tca[TCA_RATE], ovr,
+			      extack);
 	if (err < 0) {
 		if (!fold)
 			idr_remove_ext(&head->handle_idr, fnew->handle);
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index e51eb503a23a..c86072779b0a 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -403,7 +403,8 @@ static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
 
 static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp,
 			     struct cls_bpf_prog *prog, unsigned long base,
-			     struct nlattr **tb, struct nlattr *est, bool ovr)
+			     struct nlattr **tb, struct nlattr *est, bool ovr,
+			     struct netlink_ext_ack *extack)
 {
 	bool is_bpf, is_ebpf, have_exts = false;
 	u32 gen_flags = 0;
@@ -414,7 +415,7 @@ 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);
+	ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, extack);
 	if (ret < 0)
 		return ret;
 
@@ -500,7 +501,8 @@ static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
 		prog->handle = handle;
 	}
 
-	ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr);
+	ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr,
+				extack);
 	if (ret < 0)
 		goto errout_idr;
 
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index b74af0b55820..aaafcf6965f7 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -122,7 +122,8 @@ static int cls_cgroup_change(struct net *net, struct sk_buff *in_skb,
 	if (err < 0)
 		goto errout;
 
-	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, ovr);
+	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &new->exts, ovr,
+				extack);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index faa0b6793a17..07816133cbb9 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -454,7 +454,8 @@ static int flow_change(struct net *net, struct sk_buff *in_skb,
 	if (err < 0)
 		goto err2;
 
-	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, ovr);
+	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, ovr,
+				extack);
 	if (err < 0)
 		goto err2;
 
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 7d92bbeeba54..8235ed9143c4 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -827,11 +827,12 @@ static int fl_check_assign_mask(struct cls_fl_head *head,
 static int fl_set_parms(struct net *net, struct tcf_proto *tp,
 			struct cls_fl_filter *f, struct fl_flow_mask *mask,
 			unsigned long base, struct nlattr **tb,
-			struct nlattr *est, bool ovr)
+			struct nlattr *est, bool ovr,
+			struct netlink_ext_ack *extack)
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr);
+	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
 	if (err < 0)
 		return err;
 
@@ -916,7 +917,8 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 		}
 	}
 
-	err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
+	err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr,
+			   extack);
 	if (err)
 		goto errout_idr;
 
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index 72784491ce20..72a924a38753 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -218,13 +218,15 @@ static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
 
 static int fw_set_parms(struct net *net, struct tcf_proto *tp,
 			struct fw_filter *f, struct nlattr **tb,
-			struct nlattr **tca, unsigned long base, bool ovr)
+			struct nlattr **tca, unsigned long base, bool ovr,
+			struct netlink_ext_ack *extack)
 {
 	struct fw_head *head = rtnl_dereference(tp->root);
 	u32 mask;
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr);
+	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
+				extack);
 	if (err < 0)
 		return err;
 
@@ -296,7 +298,7 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
 			return err;
 		}
 
-		err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr);
+		err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
 		if (err < 0) {
 			tcf_exts_destroy(&fnew->exts);
 			kfree(fnew);
@@ -345,7 +347,7 @@ static int fw_change(struct net *net, struct sk_buff *in_skb,
 	f->id = handle;
 	f->tp = tp;
 
-	err = fw_set_parms(net, tp, f, tb, tca, base, ovr);
+	err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/sched/cls_matchall.c b/net/sched/cls_matchall.c
index 689bd199aa14..9a0901ee6b74 100644
--- a/net/sched/cls_matchall.c
+++ b/net/sched/cls_matchall.c
@@ -142,11 +142,12 @@ static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = {
 static int mall_set_parms(struct net *net, struct tcf_proto *tp,
 			  struct cls_mall_head *head,
 			  unsigned long base, struct nlattr **tb,
-			  struct nlattr *est, bool ovr)
+			  struct nlattr *est, bool ovr,
+			  struct netlink_ext_ack *extack)
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr);
+	err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, extack);
 	if (err < 0)
 		return err;
 
@@ -198,7 +199,8 @@ static int mall_change(struct net *net, struct sk_buff *in_skb,
 	new->handle = handle;
 	new->flags = flags;
 
-	err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr);
+	err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr,
+			     extack);
 	if (err)
 		goto err_set_parms;
 
diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index f436d4d894a9..92d683851cb0 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -389,7 +389,7 @@ static int route4_set_parms(struct net *net, struct tcf_proto *tp,
 			    unsigned long base, struct route4_filter *f,
 			    u32 handle, struct route4_head *head,
 			    struct nlattr **tb, struct nlattr *est, int new,
-			    bool ovr)
+			    bool ovr, struct netlink_ext_ack *extack)
 {
 	u32 id = 0, to = 0, nhandle = 0x8000;
 	struct route4_filter *fp;
@@ -397,7 +397,7 @@ 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);
+	err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr, extack);
 	if (err < 0)
 		return err;
 
@@ -516,7 +516,7 @@ static int route4_change(struct net *net, struct sk_buff *in_skb,
 	}
 
 	err = route4_set_parms(net, tp, base, f, handle, head, tb,
-			       tca[TCA_RATE], new, ovr);
+			       tca[TCA_RATE], new, ovr, extack);
 	if (err < 0)
 		goto errout;
 
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index d1f67529c01d..c27d23694002 100644
--- a/net/sched/cls_rsvp.h
+++ b/net/sched/cls_rsvp.h
@@ -511,7 +511,7 @@ 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);
+	err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr, extack);
 	if (err < 0)
 		goto errout2;
 
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index 0ec84cf2d6b7..9d6621caa92f 100644
--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -322,7 +322,7 @@ static int
 tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
 		  u32 handle, struct tcindex_data *p,
 		  struct tcindex_filter_result *r, struct nlattr **tb,
-		  struct nlattr *est, bool ovr)
+		  struct nlattr *est, bool ovr, struct netlink_ext_ack *extack)
 {
 	struct tcindex_filter_result new_filter_result, *old_r = r;
 	struct tcindex_filter_result cr;
@@ -334,7 +334,7 @@ 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);
+	err = tcf_exts_validate(net, tp, tb, est, &e, ovr, extack);
 	if (err < 0)
 		goto errout;
 
@@ -541,7 +541,7 @@ tcindex_change(struct net *net, struct sk_buff *in_skb,
 		return err;
 
 	return tcindex_set_parms(net, tp, base, handle, p, r, tb,
-				 tca[TCA_RATE], ovr);
+				 tca[TCA_RATE], ovr, extack);
 }
 
 static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index d9cadebc7eaa..933058bbd0a9 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -765,11 +765,12 @@ static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = {
 static int u32_set_parms(struct net *net, struct tcf_proto *tp,
 			 unsigned long base, struct tc_u_hnode *ht,
 			 struct tc_u_knode *n, struct nlattr **tb,
-			 struct nlattr *est, bool ovr)
+			 struct nlattr *est, bool ovr,
+			 struct netlink_ext_ack *extack)
 {
 	int err;
 
-	err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr);
+	err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack);
 	if (err < 0)
 		return err;
 
@@ -937,7 +938,7 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 
 		err = u32_set_parms(net, tp, base,
 				    rtnl_dereference(n->ht_up), new, tb,
-				    tca[TCA_RATE], ovr);
+				    tca[TCA_RATE], ovr, extack);
 
 		if (err) {
 			u32_destroy_key(tp, new, false);
@@ -1084,7 +1085,8 @@ static int u32_change(struct net *net, struct sk_buff *in_skb,
 	}
 #endif
 
-	err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr);
+	err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr,
+			    extack);
 	if (err == 0) {
 		struct tc_u_knode __rcu **ins;
 		struct tc_u_knode *pins;