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
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Jamal Hadi Salim 1999
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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struct ingress_qdisc_data {
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struct tcf_proto *filter_list;
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};
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/* ------------------------- Class/flow operations ------------------------- */
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static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
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{
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return NULL;
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}
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static unsigned long ingress_get(struct Qdisc *sch, u32 classid)
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{
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return TC_H_MIN(classid) + 1;
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}
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static unsigned long ingress_bind_filter(struct Qdisc *sch,
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unsigned long parent, u32 classid)
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{
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return ingress_get(sch, classid);
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}
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static void ingress_put(struct Qdisc *sch, unsigned long cl)
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{
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}
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static void ingress_walk(struct Qdisc *sch, struct qdisc_walker *walker)
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{
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return;
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}
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static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch, unsigned long cl)
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{
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struct ingress_qdisc_data *p = qdisc_priv(sch);
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return &p->filter_list;
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}
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/* --------------------------- Qdisc operations ---------------------------- */
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static int ingress_enqueue(struct sk_buff *skb, struct Qdisc *sch)
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{
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struct ingress_qdisc_data *p = qdisc_priv(sch);
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struct tcf_result res;
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int result;
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result = tc_classify(skb, p->filter_list, &res);
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sch->bstats.packets++;
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sch->bstats.bytes += qdisc_pkt_len(skb);
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switch (result) {
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case TC_ACT_SHOT:
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result = TC_ACT_SHOT;
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sch->qstats.drops++;
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break;
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case TC_ACT_STOLEN:
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case TC_ACT_QUEUED:
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result = TC_ACT_STOLEN;
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break;
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case TC_ACT_RECLASSIFY:
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case TC_ACT_OK:
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skb->tc_index = TC_H_MIN(res.classid);
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default:
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result = TC_ACT_OK;
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break;
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}
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return result;
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}
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/* ------------------------------------------------------------- */
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static void ingress_destroy(struct Qdisc *sch)
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{
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struct ingress_qdisc_data *p = qdisc_priv(sch);
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tcf_destroy_chain(&p->filter_list);
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}
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static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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struct nlattr *nest;
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nest = nla_nest_start(skb, TCA_OPTIONS);
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if (nest == NULL)
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goto nla_put_failure;
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nla_nest_end(skb, nest);
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return skb->len;
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nla_put_failure:
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nla_nest_cancel(skb, nest);
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return -1;
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}
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static const struct Qdisc_class_ops ingress_class_ops = {
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.leaf = ingress_leaf,
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.get = ingress_get,
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.put = ingress_put,
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.walk = ingress_walk,
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.tcf_chain = ingress_find_tcf,
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.bind_tcf = ingress_bind_filter,
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.unbind_tcf = ingress_put,
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};
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static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
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.cl_ops = &ingress_class_ops,
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.id = "ingress",
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.priv_size = sizeof(struct ingress_qdisc_data),
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.enqueue = ingress_enqueue,
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.destroy = ingress_destroy,
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.dump = ingress_dump,
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.owner = THIS_MODULE,
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};
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static int __init ingress_module_init(void)
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{
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return register_qdisc(&ingress_qdisc_ops);
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}
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static void __exit ingress_module_exit(void)
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{
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unregister_qdisc(&ingress_qdisc_ops);
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}
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module_init(ingress_module_init)
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module_exit(ingress_module_exit)
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MODULE_LICENSE("GPL");
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