netdev - [PATCH net-next v3 1/4] net/sched: act_pedit: use extack in 'ex' parsing errors

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Date:   Fri, 17 Mar 2023 16:51:32 -0300
From:   Pedro Tammela <pctammela@...atatu.com>
To:     netdev@...r.kernel.org
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, simon.horman@...igine.com,
        Pedro Tammela <pctammela@...atatu.com>
Subject: [PATCH net-next v3 1/4] net/sched: act_pedit: use extack in 'ex' parsing errors

We have extack available when parsing 'ex' keys, so pass it to
tcf_pedit_keys_ex_parse and add more detailed error messages.
While at it, remove redundant code from the 'err_out' label code path.

Reviewed-by: Jamal Hadi Salim <jhs@...atatu.com>
Signed-off-by: Pedro Tammela <pctammela@...atatu.com>
---
 net/sched/act_pedit.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index 4559a1507ea5..cd3cbe397e87 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -35,7 +35,7 @@ static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = {
 };
 
 static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
-							u8 n)
+							u8 n, struct netlink_ext_ack *extack)
 {
 	struct tcf_pedit_key_ex *keys_ex;
 	struct tcf_pedit_key_ex *k;
@@ -56,25 +56,25 @@ static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
 		struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1];
 
 		if (!n) {
-			err = -EINVAL;
+			NL_SET_ERR_MSG_MOD(extack, "Can't parse more extended keys than requested");
 			goto err_out;
 		}
+
 		n--;
 
 		if (nla_type(ka) != TCA_PEDIT_KEY_EX) {
-			err = -EINVAL;
+			NL_SET_ERR_MSG_MOD(extack, "Unknown attribute, expected extended key");
 			goto err_out;
 		}
 
-		err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX,
-						  ka, pedit_key_ex_policy,
-						  NULL);
+		err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX, ka,
+						  pedit_key_ex_policy, extack);
 		if (err)
 			goto err_out;
 
 		if (!tb[TCA_PEDIT_KEY_EX_HTYPE] ||
 		    !tb[TCA_PEDIT_KEY_EX_CMD]) {
-			err = -EINVAL;
+			NL_SET_ERR_MSG_MOD(extack, "Extended Pedit missing required attributes");
 			goto err_out;
 		}
 
@@ -83,7 +83,7 @@ static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
 
 		if (k->htype > TCA_PEDIT_HDR_TYPE_MAX ||
 		    k->cmd > TCA_PEDIT_CMD_MAX) {
-			err = -EINVAL;
+			NL_SET_ERR_MSG_MOD(extack, "Extended Pedit key is malformed");
 			goto err_out;
 		}
 
@@ -91,7 +91,7 @@ static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla,
 	}
 
 	if (n) {
-		err = -EINVAL;
+		NL_SET_ERR_MSG_MOD(extack, "Not enough extended keys to parse");
 		goto err_out;
 	}
 
@@ -222,7 +222,7 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
 	}
 
 	nparms->tcfp_keys_ex =
-		tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
+		tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys, extack);
 	if (IS_ERR(nparms->tcfp_keys_ex)) {
 		ret = PTR_ERR(nparms->tcfp_keys_ex);
 		goto out_free;
-- 
2.34.1