net sched actions: add extack messages in pedit action

Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index ab151346d3d45a754046f239642e1fa6b3e16808..55bc96b610e83f5d12f6660e3e33c643db75684f 100644 (file)
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -144,8 +144,10 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
        int ret = 0, err;
        int ksize;
 
-       if (!nla)
+       if (!nla) {
+               NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed");
                return -EINVAL;
+       }
 
        err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy, NULL);
        if (err < 0)
@@ -154,21 +156,27 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
        pattr = tb[TCA_PEDIT_PARMS];
        if (!pattr)
                pattr = tb[TCA_PEDIT_PARMS_EX];
-       if (!pattr)
+       if (!pattr) {
+               NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute");
                return -EINVAL;
+       }
 
        parm = nla_data(pattr);
        ksize = parm->nkeys * sizeof(struct tc_pedit_key);
-       if (nla_len(pattr) < sizeof(*parm) + ksize)
+       if (nla_len(pattr) < sizeof(*parm) + ksize) {
+               NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid");
                return -EINVAL;
+       }
 
        keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys);
        if (IS_ERR(keys_ex))
                return PTR_ERR(keys_ex);
 
        if (!tcf_idr_check(tn, parm->index, a, bind)) {
-               if (!parm->nkeys)
+               if (!parm->nkeys) {
+                       NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed");
                        return -EINVAL;
+               }
                ret = tcf_idr_create(tn, parm->index, est, a,
                                     &act_pedit_ops, bind, false);
                if (ret)