This patch adds extack support for the cbq qdisc implementation by
adding NL_SET_ERR_MSG in validation of user input.
Also it serves to illustrate a use case of how the infrastructure ops
api changes are to be used by individual qdiscs.
Cc: David Ahern <dsah...@gmail.com>
Signed-off-by: Alexander Aring <ar...@mojatatu.com>
---
net/sched/sch_cbq.c | 46 ++++++++++++++++++++++++++++++++++------------
1 file changed, 34 insertions(+), 12 deletions(-)
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index efe5bf15b031..f42025d53cfe 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1144,15 +1144,19 @@ static int cbq_init(struct Qdisc *sch, struct nlattr
*opt,
hrtimer_init(&q->delay_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
q->delay_timer.function = cbq_undelay;
- if (!opt)
+ if (!opt) {
+ NL_SET_ERR_MSG(extack, "CBQ options are required for this
operation");
return -EINVAL;
+ }
- err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy, NULL);
+ err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy, extack);
if (err < 0)
return err;
- if (!tb[TCA_CBQ_RTAB] || !tb[TCA_CBQ_RATE])
+ if (!tb[TCA_CBQ_RTAB] || !tb[TCA_CBQ_RATE]) {
+ NL_SET_ERR_MSG(extack, "Rate specification missing or
incomplete");
return -EINVAL;
+ }
r = nla_data(tb[TCA_CBQ_RATE]);
@@ -1462,24 +1466,32 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32
parentid, struct nlattr **t
struct cbq_class *parent;
struct qdisc_rate_table *rtab = NULL;
- if (!opt)
+ if (!opt) {
+ NL_SET_ERR_MSG(extack, "Mandatory qdisc options missing");
return -EINVAL;
+ }
- err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy, NULL);
+ err = nla_parse_nested(tb, TCA_CBQ_MAX, opt, cbq_policy, extack);
if (err < 0)
return err;
- if (tb[TCA_CBQ_OVL_STRATEGY] || tb[TCA_CBQ_POLICE])
+ if (tb[TCA_CBQ_OVL_STRATEGY] || tb[TCA_CBQ_POLICE]) {
+ NL_SET_ERR_MSG(extack, "Neither overlimit strategy nor policing
attributes can be used for changing class params");
return -EOPNOTSUPP;
+ }
if (cl) {
/* Check parent */
if (parentid) {
if (cl->tparent &&
- cl->tparent->common.classid != parentid)
+ cl->tparent->common.classid != parentid) {
+ NL_SET_ERR_MSG(extack, "Invalid parent id");
return -EINVAL;
- if (!cl->tparent && parentid != TC_H_ROOT)
+ }
+ if (!cl->tparent && parentid != TC_H_ROOT) {
+ NL_SET_ERR_MSG(extack, "Parent must be root");
return -EINVAL;
+ }
}
if (tb[TCA_CBQ_RATE]) {
@@ -1496,6 +1508,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32
parentid, struct nlattr **t
qdisc_root_sleeping_running(sch),
tca[TCA_RATE]);
if (err) {
+ NL_SET_ERR_MSG(extack, "Failed to replace
specified rate estimator");
qdisc_put_rtab(rtab);
return err;
}
@@ -1534,8 +1547,10 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32
parentid, struct nlattr **t
if (parentid == TC_H_ROOT)
return -EINVAL;
- if (!tb[TCA_CBQ_WRROPT] || !tb[TCA_CBQ_RATE] || !tb[TCA_CBQ_LSSOPT])
+ if (!tb[TCA_CBQ_WRROPT] || !tb[TCA_CBQ_RATE] || !tb[TCA_CBQ_LSSOPT]) {
+ NL_SET_ERR_MSG(extack, "One of the following attributes MUST be
specified: WRR, rate or link sharing");
return -EINVAL;
+ }
rtab = qdisc_get_rtab(nla_data(tb[TCA_CBQ_RATE]), tb[TCA_CBQ_RTAB],
extack);
@@ -1545,8 +1560,10 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32
parentid, struct nlattr **t
if (classid) {
err = -EINVAL;
if (TC_H_MAJ(classid ^ sch->handle) ||
- cbq_class_lookup(q, classid))
+ cbq_class_lookup(q, classid)) {
+ NL_SET_ERR_MSG(extack, "Specified class not found");
goto failure;
+ }
} else {
int i;
classid = TC_H_MAKE(sch->handle, 0x8000);
@@ -1558,8 +1575,10 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32
parentid, struct nlattr **t
break;
}
err = -ENOSR;
- if (i >= 0x8000)
+ if (i >= 0x8000) {
+ NL_SET_ERR_MSG(extack, "Unable to generate classid");
goto failure;
+ }
classid = classid|q->hgenerator;
}
@@ -1567,8 +1586,10 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32
parentid, struct nlattr **t
if (parentid) {
parent = cbq_class_lookup(q, parentid);
err = -EINVAL;
- if (!parent)
+ if (!parent) {
+ NL_SET_ERR_MSG(extack, "Failed to find parentid");
goto failure;
+ }
}
err = -ENOBUFS;
@@ -1588,6 +1609,7 @@ cbq_change_class(struct Qdisc *sch, u32 classid, u32
parentid, struct nlattr **t
qdisc_root_sleeping_running(sch),
tca[TCA_RATE]);
if (err) {
+ NL_SET_ERR_MSG(extack, "Couldn't create new estimator");
tcf_block_put(cl->block);
kfree(cl);
goto failure;
--
2.11.0
