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sched: act_ctinfo: use extack error reporting 

Use extack error reporting mechanism in addition to returning -EINVAL

NL_SET_ERR_* code shamelessy copy/paste/adjusted from act_pedit &
sch_cake and used as reference as to what I should have done in the
first place.

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kevin Darbyshire-Bryant 2019-06-14 10:09:44 +01:00 committed by David S. Miller
parent 3adcfa4478
commit 733f0766c3
1 changed files with 18 additions and 5 deletions
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23
net/sched/act_ctinfo.c
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@ -165,15 +165,20 @@ static int tcf_ctinfo_init(struct net *net, struct nlattr *nla,
u8 dscpmaskshift;
int ret = 0, err;
if (!nla)
if (!nla) {
NL_SET_ERR_MSG_MOD(extack, "ctinfo requires attributes to be passed");
return -EINVAL;
}
err = nla_parse_nested(tb, TCA_CTINFO_MAX, nla, ctinfo_policy, NULL);
err = nla_parse_nested(tb, TCA_CTINFO_MAX, nla, ctinfo_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_CTINFO_ACT])
if (!tb[TCA_CTINFO_ACT]) {
NL_SET_ERR_MSG_MOD(extack,
"Missing required TCA_CTINFO_ACT attribute");
return -EINVAL;
}
actparm = nla_data(tb[TCA_CTINFO_ACT]);
/* do some basic validation here before dynamically allocating things */
@ -182,13 +187,21 @@ static int tcf_ctinfo_init(struct net *net, struct nlattr *nla,
dscpmask = nla_get_u32(tb[TCA_CTINFO_PARMS_DSCP_MASK]);
/* need contiguous 6 bit mask */
dscpmaskshift = dscpmask ? __ffs(dscpmask) : 0;
if ((~0 & (dscpmask >> dscpmaskshift)) != 0x3f)
if ((~0 & (dscpmask >> dscpmaskshift)) != 0x3f) {
NL_SET_ERR_MSG_ATTR(extack,
tb[TCA_CTINFO_PARMS_DSCP_MASK],
"dscp mask must be 6 contiguous bits");
return -EINVAL;
}
dscpstatemask = tb[TCA_CTINFO_PARMS_DSCP_STATEMASK] ?
nla_get_u32(tb[TCA_CTINFO_PARMS_DSCP_STATEMASK]) : 0;
/* mask & statemask must not overlap */
if (dscpmask & dscpstatemask)
if (dscpmask & dscpstatemask) {
NL_SET_ERR_MSG_ATTR(extack,
tb[TCA_CTINFO_PARMS_DSCP_STATEMASK],
"dscp statemask must not overlap dscp mask");
return -EINVAL;
}
}
/* done the validation:now to the actual action allocation */