mirror of
https://github.com/adulau/aha.git
synced 2024-12-27 11:16:11 +00:00
de6d5cdf88
Some schedulers don't support creating, changing or deleting classes. Make the respective callbacks optionally and consistently return -EOPNOTSUPP for unsupported operations, instead of currently either -EOPNOTSUPP, -ENOSYS or no error. In case of sch_prio and sch_multiq, the removed operations additionally checked for an invalid class. This is not necessary since the class argument can only orginate from ->get() or in case of ->change is 0 for creation of new classes, in which case ->change() incorrectly returned -ENOENT. As a side-effect, this patch fixes a possible (root-only) NULL pointer function call in sch_ingress, which didn't implement a so far mandatory ->delete() operation. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
145 lines
3.2 KiB
C
145 lines
3.2 KiB
C
/* net/sched/sch_ingress.c - Ingress qdisc
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*
|
|
* Authors: Jamal Hadi Salim 1999
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/list.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <net/netlink.h>
|
|
#include <net/pkt_sched.h>
|
|
|
|
|
|
struct ingress_qdisc_data {
|
|
struct tcf_proto *filter_list;
|
|
};
|
|
|
|
/* ------------------------- Class/flow operations ------------------------- */
|
|
|
|
static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
|
|
{
|
|
return TC_H_MIN(classid) + 1;
|
|
}
|
|
|
|
static unsigned long ingress_bind_filter(struct Qdisc *sch,
|
|
unsigned long parent, u32 classid)
|
|
{
|
|
return ingress_get(sch, classid);
|
|
}
|
|
|
|
static void ingress_put(struct Qdisc *sch, unsigned long cl)
|
|
{
|
|
}
|
|
|
|
static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
|
|
{
|
|
return;
|
|
}
|
|
|
|
static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
|
|
{
|
|
struct ingress_qdisc_data *p = qdisc_priv(sch);
|
|
|
|
return &p->filter_list;
|
|
}
|
|
|
|
/* --------------------------- Qdisc operations ---------------------------- */
|
|
|
|
static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
|
|
{
|
|
struct ingress_qdisc_data *p = qdisc_priv(sch);
|
|
struct tcf_result res;
|
|
int result;
|
|
|
|
result = tc_classify(skb, p->filter_list, &res);
|
|
|
|
sch->bstats.packets++;
|
|
sch->bstats.bytes += qdisc_pkt_len(skb);
|
|
switch (result) {
|
|
case TC_ACT_SHOT:
|
|
result = TC_ACT_SHOT;
|
|
sch->qstats.drops++;
|
|
break;
|
|
case TC_ACT_STOLEN:
|
|
case TC_ACT_QUEUED:
|
|
result = TC_ACT_STOLEN;
|
|
break;
|
|
case TC_ACT_RECLASSIFY:
|
|
case TC_ACT_OK:
|
|
skb->tc_index = TC_H_MIN(res.classid);
|
|
default:
|
|
result = TC_ACT_OK;
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* ------------------------------------------------------------- */
|
|
|
|
static void ingress_destroy(struct Qdisc *sch)
|
|
{
|
|
struct ingress_qdisc_data *p = qdisc_priv(sch);
|
|
|
|
tcf_destroy_chain(&p->filter_list);
|
|
}
|
|
|
|
static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
}
|
|
|
|
static const struct Qdisc_class_ops ingress_class_ops = {
|
|
.leaf = ingress_leaf,
|
|
.get = ingress_get,
|
|
.put = ingress_put,
|
|
.walk = ingress_walk,
|
|
.tcf_chain = ingress_find_tcf,
|
|
.bind_tcf = ingress_bind_filter,
|
|
.unbind_tcf = ingress_put,
|
|
};
|
|
|
|
static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
|
|
.cl_ops = &ingress_class_ops,
|
|
.id = "ingress",
|
|
.priv_size = sizeof(struct ingress_qdisc_data),
|
|
.enqueue = ingress_enqueue,
|
|
.destroy = ingress_destroy,
|
|
.dump = ingress_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init ingress_module_init(void)
|
|
{
|
|
return register_qdisc(&ingress_qdisc_ops);
|
|
}
|
|
|
|
static void __exit ingress_module_exit(void)
|
|
{
|
|
unregister_qdisc(&ingress_qdisc_ops);
|
|
}
|
|
|
|
module_init(ingress_module_init)
|
|
module_exit(ingress_module_exit)
|
|
MODULE_LICENSE("GPL");
|