![Cong Wang](/assets/img/avatar_default.png)
Marcelo noticed a backward compatibility issue of TCA_KIND
after we move from NLA_STRING to NLA_NUL_STRING, so it is probably
too late to change it.
Instead, to make everyone happy, we can just insert a NUL to
terminate the string with nla_strlcpy() like we do for TC actions.
Fixes: 62794fc4fb
("net_sched: add max len check for TCA_KIND")
Reported-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
2273 lines
54 KiB
C
2273 lines
54 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* net/sched/sch_api.c Packet scheduler API.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Fixes:
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*
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* Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired.
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* Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
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* Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support
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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/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/kmod.h>
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#include <linux/list.h>
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#include <linux/hrtimer.h>
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#include <linux/slab.h>
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#include <linux/hashtable.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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/*
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Short review.
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-------------
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This file consists of two interrelated parts:
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1. queueing disciplines manager frontend.
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2. traffic classes manager frontend.
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Generally, queueing discipline ("qdisc") is a black box,
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which is able to enqueue packets and to dequeue them (when
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device is ready to send something) in order and at times
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determined by algorithm hidden in it.
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qdisc's are divided to two categories:
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- "queues", which have no internal structure visible from outside.
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- "schedulers", which split all the packets to "traffic classes",
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using "packet classifiers" (look at cls_api.c)
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In turn, classes may have child qdiscs (as rule, queues)
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attached to them etc. etc. etc.
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The goal of the routines in this file is to translate
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information supplied by user in the form of handles
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to more intelligible for kernel form, to make some sanity
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checks and part of work, which is common to all qdiscs
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and to provide rtnetlink notifications.
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All real intelligent work is done inside qdisc modules.
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Every discipline has two major routines: enqueue and dequeue.
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---dequeue
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dequeue usually returns a skb to send. It is allowed to return NULL,
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but it does not mean that queue is empty, it just means that
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discipline does not want to send anything this time.
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Queue is really empty if q->q.qlen == 0.
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For complicated disciplines with multiple queues q->q is not
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real packet queue, but however q->q.qlen must be valid.
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---enqueue
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enqueue returns 0, if packet was enqueued successfully.
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If packet (this one or another one) was dropped, it returns
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not zero error code.
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NET_XMIT_DROP - this packet dropped
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Expected action: do not backoff, but wait until queue will clear.
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NET_XMIT_CN - probably this packet enqueued, but another one dropped.
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Expected action: backoff or ignore
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Auxiliary routines:
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---peek
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like dequeue but without removing a packet from the queue
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---reset
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returns qdisc to initial state: purge all buffers, clear all
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timers, counters (except for statistics) etc.
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---init
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initializes newly created qdisc.
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---destroy
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destroys resources allocated by init and during lifetime of qdisc.
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---change
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changes qdisc parameters.
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*/
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/* Protects list of registered TC modules. It is pure SMP lock. */
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static DEFINE_RWLOCK(qdisc_mod_lock);
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/************************************************
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* Queueing disciplines manipulation. *
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************************************************/
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/* The list of all installed queueing disciplines. */
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static struct Qdisc_ops *qdisc_base;
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/* Register/unregister queueing discipline */
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int register_qdisc(struct Qdisc_ops *qops)
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{
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struct Qdisc_ops *q, **qp;
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int rc = -EEXIST;
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write_lock(&qdisc_mod_lock);
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for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
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if (!strcmp(qops->id, q->id))
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goto out;
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if (qops->enqueue == NULL)
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qops->enqueue = noop_qdisc_ops.enqueue;
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if (qops->peek == NULL) {
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if (qops->dequeue == NULL)
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qops->peek = noop_qdisc_ops.peek;
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else
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goto out_einval;
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}
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if (qops->dequeue == NULL)
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qops->dequeue = noop_qdisc_ops.dequeue;
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if (qops->cl_ops) {
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const struct Qdisc_class_ops *cops = qops->cl_ops;
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if (!(cops->find && cops->walk && cops->leaf))
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goto out_einval;
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if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf))
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goto out_einval;
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}
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qops->next = NULL;
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*qp = qops;
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rc = 0;
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out:
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write_unlock(&qdisc_mod_lock);
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return rc;
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out_einval:
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rc = -EINVAL;
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goto out;
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}
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EXPORT_SYMBOL(register_qdisc);
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int unregister_qdisc(struct Qdisc_ops *qops)
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{
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struct Qdisc_ops *q, **qp;
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int err = -ENOENT;
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write_lock(&qdisc_mod_lock);
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for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
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if (q == qops)
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break;
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if (q) {
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*qp = q->next;
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q->next = NULL;
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err = 0;
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}
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write_unlock(&qdisc_mod_lock);
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return err;
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}
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EXPORT_SYMBOL(unregister_qdisc);
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/* Get default qdisc if not otherwise specified */
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void qdisc_get_default(char *name, size_t len)
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{
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read_lock(&qdisc_mod_lock);
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strlcpy(name, default_qdisc_ops->id, len);
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read_unlock(&qdisc_mod_lock);
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}
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static struct Qdisc_ops *qdisc_lookup_default(const char *name)
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{
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struct Qdisc_ops *q = NULL;
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for (q = qdisc_base; q; q = q->next) {
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if (!strcmp(name, q->id)) {
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if (!try_module_get(q->owner))
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q = NULL;
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break;
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}
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}
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return q;
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}
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/* Set new default qdisc to use */
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int qdisc_set_default(const char *name)
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{
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const struct Qdisc_ops *ops;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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write_lock(&qdisc_mod_lock);
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ops = qdisc_lookup_default(name);
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if (!ops) {
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/* Not found, drop lock and try to load module */
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write_unlock(&qdisc_mod_lock);
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request_module("sch_%s", name);
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write_lock(&qdisc_mod_lock);
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ops = qdisc_lookup_default(name);
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}
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if (ops) {
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/* Set new default */
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module_put(default_qdisc_ops->owner);
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default_qdisc_ops = ops;
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}
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write_unlock(&qdisc_mod_lock);
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return ops ? 0 : -ENOENT;
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}
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#ifdef CONFIG_NET_SCH_DEFAULT
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/* Set default value from kernel config */
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static int __init sch_default_qdisc(void)
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{
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return qdisc_set_default(CONFIG_DEFAULT_NET_SCH);
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}
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late_initcall(sch_default_qdisc);
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#endif
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/* We know handle. Find qdisc among all qdisc's attached to device
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* (root qdisc, all its children, children of children etc.)
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* Note: caller either uses rtnl or rcu_read_lock()
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*/
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static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle)
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{
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struct Qdisc *q;
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if (!qdisc_dev(root))
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return (root->handle == handle ? root : NULL);
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if (!(root->flags & TCQ_F_BUILTIN) &&
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root->handle == handle)
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return root;
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hash_for_each_possible_rcu(qdisc_dev(root)->qdisc_hash, q, hash, handle) {
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if (q->handle == handle)
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return q;
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}
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return NULL;
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}
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void qdisc_hash_add(struct Qdisc *q, bool invisible)
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{
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if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
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ASSERT_RTNL();
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hash_add_rcu(qdisc_dev(q)->qdisc_hash, &q->hash, q->handle);
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if (invisible)
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q->flags |= TCQ_F_INVISIBLE;
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}
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}
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EXPORT_SYMBOL(qdisc_hash_add);
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void qdisc_hash_del(struct Qdisc *q)
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{
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if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) {
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ASSERT_RTNL();
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hash_del_rcu(&q->hash);
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}
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}
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EXPORT_SYMBOL(qdisc_hash_del);
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struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
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{
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struct Qdisc *q;
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if (!handle)
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return NULL;
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q = qdisc_match_from_root(dev->qdisc, handle);
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if (q)
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goto out;
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if (dev_ingress_queue(dev))
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q = qdisc_match_from_root(
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dev_ingress_queue(dev)->qdisc_sleeping,
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handle);
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out:
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return q;
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}
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struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle)
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{
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struct netdev_queue *nq;
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struct Qdisc *q;
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if (!handle)
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return NULL;
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q = qdisc_match_from_root(dev->qdisc, handle);
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if (q)
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goto out;
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nq = dev_ingress_queue_rcu(dev);
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if (nq)
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q = qdisc_match_from_root(nq->qdisc_sleeping, handle);
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out:
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return q;
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}
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static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
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{
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unsigned long cl;
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const struct Qdisc_class_ops *cops = p->ops->cl_ops;
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if (cops == NULL)
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return NULL;
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cl = cops->find(p, classid);
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if (cl == 0)
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return NULL;
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return cops->leaf(p, cl);
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}
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/* Find queueing discipline by name */
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static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
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{
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struct Qdisc_ops *q = NULL;
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if (kind) {
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read_lock(&qdisc_mod_lock);
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for (q = qdisc_base; q; q = q->next) {
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if (nla_strcmp(kind, q->id) == 0) {
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if (!try_module_get(q->owner))
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q = NULL;
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break;
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}
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}
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read_unlock(&qdisc_mod_lock);
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}
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return q;
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}
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/* The linklayer setting were not transferred from iproute2, in older
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* versions, and the rate tables lookup systems have been dropped in
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* the kernel. To keep backward compatible with older iproute2 tc
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* utils, we detect the linklayer setting by detecting if the rate
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* table were modified.
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*
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* For linklayer ATM table entries, the rate table will be aligned to
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* 48 bytes, thus some table entries will contain the same value. The
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* mpu (min packet unit) is also encoded into the old rate table, thus
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* starting from the mpu, we find low and high table entries for
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* mapping this cell. If these entries contain the same value, when
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* the rate tables have been modified for linklayer ATM.
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*
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* This is done by rounding mpu to the nearest 48 bytes cell/entry,
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* and then roundup to the next cell, calc the table entry one below,
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* and compare.
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*/
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static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
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{
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int low = roundup(r->mpu, 48);
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int high = roundup(low+1, 48);
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int cell_low = low >> r->cell_log;
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int cell_high = (high >> r->cell_log) - 1;
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/* rtab is too inaccurate at rates > 100Mbit/s */
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if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
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pr_debug("TC linklayer: Giving up ATM detection\n");
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return TC_LINKLAYER_ETHERNET;
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}
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if ((cell_high > cell_low) && (cell_high < 256)
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&& (rtab[cell_low] == rtab[cell_high])) {
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pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
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cell_low, cell_high, rtab[cell_high]);
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return TC_LINKLAYER_ATM;
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}
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return TC_LINKLAYER_ETHERNET;
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}
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static struct qdisc_rate_table *qdisc_rtab_list;
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struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
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struct nlattr *tab,
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struct netlink_ext_ack *extack)
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{
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struct qdisc_rate_table *rtab;
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if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
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nla_len(tab) != TC_RTAB_SIZE) {
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NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching");
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return NULL;
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}
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for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) {
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if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) &&
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!memcmp(&rtab->data, nla_data(tab), 1024)) {
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rtab->refcnt++;
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return rtab;
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}
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}
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|
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rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
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if (rtab) {
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rtab->rate = *r;
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rtab->refcnt = 1;
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memcpy(rtab->data, nla_data(tab), 1024);
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if (r->linklayer == TC_LINKLAYER_UNAWARE)
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r->linklayer = __detect_linklayer(r, rtab->data);
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rtab->next = qdisc_rtab_list;
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qdisc_rtab_list = rtab;
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} else {
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NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table");
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}
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return rtab;
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}
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EXPORT_SYMBOL(qdisc_get_rtab);
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void qdisc_put_rtab(struct qdisc_rate_table *tab)
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{
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struct qdisc_rate_table *rtab, **rtabp;
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if (!tab || --tab->refcnt)
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return;
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for (rtabp = &qdisc_rtab_list;
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(rtab = *rtabp) != NULL;
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rtabp = &rtab->next) {
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if (rtab == tab) {
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*rtabp = rtab->next;
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kfree(rtab);
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return;
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}
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}
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}
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EXPORT_SYMBOL(qdisc_put_rtab);
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|
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static LIST_HEAD(qdisc_stab_list);
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|
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static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
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[TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) },
|
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[TCA_STAB_DATA] = { .type = NLA_BINARY },
|
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};
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|
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static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt,
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struct netlink_ext_ack *extack)
|
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{
|
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struct nlattr *tb[TCA_STAB_MAX + 1];
|
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struct qdisc_size_table *stab;
|
|
struct tc_sizespec *s;
|
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unsigned int tsize = 0;
|
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u16 *tab = NULL;
|
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int err;
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|
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err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy,
|
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extack);
|
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if (err < 0)
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return ERR_PTR(err);
|
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if (!tb[TCA_STAB_BASE]) {
|
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NL_SET_ERR_MSG(extack, "Size table base attribute is missing");
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return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
s = nla_data(tb[TCA_STAB_BASE]);
|
|
|
|
if (s->tsize > 0) {
|
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if (!tb[TCA_STAB_DATA]) {
|
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NL_SET_ERR_MSG(extack, "Size table data attribute is missing");
|
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return ERR_PTR(-EINVAL);
|
|
}
|
|
tab = nla_data(tb[TCA_STAB_DATA]);
|
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tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
|
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}
|
|
|
|
if (tsize != s->tsize || (!tab && tsize > 0)) {
|
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NL_SET_ERR_MSG(extack, "Invalid size of size table");
|
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return ERR_PTR(-EINVAL);
|
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}
|
|
|
|
list_for_each_entry(stab, &qdisc_stab_list, list) {
|
|
if (memcmp(&stab->szopts, s, sizeof(*s)))
|
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continue;
|
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if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
|
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continue;
|
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stab->refcnt++;
|
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return stab;
|
|
}
|
|
|
|
stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL);
|
|
if (!stab)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
stab->refcnt = 1;
|
|
stab->szopts = *s;
|
|
if (tsize > 0)
|
|
memcpy(stab->data, tab, tsize * sizeof(u16));
|
|
|
|
list_add_tail(&stab->list, &qdisc_stab_list);
|
|
|
|
return stab;
|
|
}
|
|
|
|
void qdisc_put_stab(struct qdisc_size_table *tab)
|
|
{
|
|
if (!tab)
|
|
return;
|
|
|
|
if (--tab->refcnt == 0) {
|
|
list_del(&tab->list);
|
|
kfree_rcu(tab, rcu);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(qdisc_put_stab);
|
|
|
|
static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
nest = nla_nest_start_noflag(skb, TCA_STAB);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest);
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
return -1;
|
|
}
|
|
|
|
void __qdisc_calculate_pkt_len(struct sk_buff *skb,
|
|
const struct qdisc_size_table *stab)
|
|
{
|
|
int pkt_len, slot;
|
|
|
|
pkt_len = skb->len + stab->szopts.overhead;
|
|
if (unlikely(!stab->szopts.tsize))
|
|
goto out;
|
|
|
|
slot = pkt_len + stab->szopts.cell_align;
|
|
if (unlikely(slot < 0))
|
|
slot = 0;
|
|
|
|
slot >>= stab->szopts.cell_log;
|
|
if (likely(slot < stab->szopts.tsize))
|
|
pkt_len = stab->data[slot];
|
|
else
|
|
pkt_len = stab->data[stab->szopts.tsize - 1] *
|
|
(slot / stab->szopts.tsize) +
|
|
stab->data[slot % stab->szopts.tsize];
|
|
|
|
pkt_len <<= stab->szopts.size_log;
|
|
out:
|
|
if (unlikely(pkt_len < 1))
|
|
pkt_len = 1;
|
|
qdisc_skb_cb(skb)->pkt_len = pkt_len;
|
|
}
|
|
EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
|
|
|
|
void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
|
|
{
|
|
if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
|
|
pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
|
|
txt, qdisc->ops->id, qdisc->handle >> 16);
|
|
qdisc->flags |= TCQ_F_WARN_NONWC;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(qdisc_warn_nonwc);
|
|
|
|
static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
|
|
{
|
|
struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
|
|
timer);
|
|
|
|
rcu_read_lock();
|
|
__netif_schedule(qdisc_root(wd->qdisc));
|
|
rcu_read_unlock();
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
void qdisc_watchdog_init_clockid(struct qdisc_watchdog *wd, struct Qdisc *qdisc,
|
|
clockid_t clockid)
|
|
{
|
|
hrtimer_init(&wd->timer, clockid, HRTIMER_MODE_ABS_PINNED);
|
|
wd->timer.function = qdisc_watchdog;
|
|
wd->qdisc = qdisc;
|
|
}
|
|
EXPORT_SYMBOL(qdisc_watchdog_init_clockid);
|
|
|
|
void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
|
|
{
|
|
qdisc_watchdog_init_clockid(wd, qdisc, CLOCK_MONOTONIC);
|
|
}
|
|
EXPORT_SYMBOL(qdisc_watchdog_init);
|
|
|
|
void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
|
|
{
|
|
if (test_bit(__QDISC_STATE_DEACTIVATED,
|
|
&qdisc_root_sleeping(wd->qdisc)->state))
|
|
return;
|
|
|
|
if (wd->last_expires == expires)
|
|
return;
|
|
|
|
wd->last_expires = expires;
|
|
hrtimer_start(&wd->timer,
|
|
ns_to_ktime(expires),
|
|
HRTIMER_MODE_ABS_PINNED);
|
|
}
|
|
EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
|
|
|
|
void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
|
|
{
|
|
hrtimer_cancel(&wd->timer);
|
|
}
|
|
EXPORT_SYMBOL(qdisc_watchdog_cancel);
|
|
|
|
static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
|
|
{
|
|
struct hlist_head *h;
|
|
unsigned int i;
|
|
|
|
h = kvmalloc_array(n, sizeof(struct hlist_head), GFP_KERNEL);
|
|
|
|
if (h != NULL) {
|
|
for (i = 0; i < n; i++)
|
|
INIT_HLIST_HEAD(&h[i]);
|
|
}
|
|
return h;
|
|
}
|
|
|
|
void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
|
|
{
|
|
struct Qdisc_class_common *cl;
|
|
struct hlist_node *next;
|
|
struct hlist_head *nhash, *ohash;
|
|
unsigned int nsize, nmask, osize;
|
|
unsigned int i, h;
|
|
|
|
/* Rehash when load factor exceeds 0.75 */
|
|
if (clhash->hashelems * 4 <= clhash->hashsize * 3)
|
|
return;
|
|
nsize = clhash->hashsize * 2;
|
|
nmask = nsize - 1;
|
|
nhash = qdisc_class_hash_alloc(nsize);
|
|
if (nhash == NULL)
|
|
return;
|
|
|
|
ohash = clhash->hash;
|
|
osize = clhash->hashsize;
|
|
|
|
sch_tree_lock(sch);
|
|
for (i = 0; i < osize; i++) {
|
|
hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
|
|
h = qdisc_class_hash(cl->classid, nmask);
|
|
hlist_add_head(&cl->hnode, &nhash[h]);
|
|
}
|
|
}
|
|
clhash->hash = nhash;
|
|
clhash->hashsize = nsize;
|
|
clhash->hashmask = nmask;
|
|
sch_tree_unlock(sch);
|
|
|
|
kvfree(ohash);
|
|
}
|
|
EXPORT_SYMBOL(qdisc_class_hash_grow);
|
|
|
|
int qdisc_class_hash_init(struct Qdisc_class_hash *clhash)
|
|
{
|
|
unsigned int size = 4;
|
|
|
|
clhash->hash = qdisc_class_hash_alloc(size);
|
|
if (!clhash->hash)
|
|
return -ENOMEM;
|
|
clhash->hashsize = size;
|
|
clhash->hashmask = size - 1;
|
|
clhash->hashelems = 0;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(qdisc_class_hash_init);
|
|
|
|
void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash)
|
|
{
|
|
kvfree(clhash->hash);
|
|
}
|
|
EXPORT_SYMBOL(qdisc_class_hash_destroy);
|
|
|
|
void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash,
|
|
struct Qdisc_class_common *cl)
|
|
{
|
|
unsigned int h;
|
|
|
|
INIT_HLIST_NODE(&cl->hnode);
|
|
h = qdisc_class_hash(cl->classid, clhash->hashmask);
|
|
hlist_add_head(&cl->hnode, &clhash->hash[h]);
|
|
clhash->hashelems++;
|
|
}
|
|
EXPORT_SYMBOL(qdisc_class_hash_insert);
|
|
|
|
void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash,
|
|
struct Qdisc_class_common *cl)
|
|
{
|
|
hlist_del(&cl->hnode);
|
|
clhash->hashelems--;
|
|
}
|
|
EXPORT_SYMBOL(qdisc_class_hash_remove);
|
|
|
|
/* Allocate an unique handle from space managed by kernel
|
|
* Possible range is [8000-FFFF]:0000 (0x8000 values)
|
|
*/
|
|
static u32 qdisc_alloc_handle(struct net_device *dev)
|
|
{
|
|
int i = 0x8000;
|
|
static u32 autohandle = TC_H_MAKE(0x80000000U, 0);
|
|
|
|
do {
|
|
autohandle += TC_H_MAKE(0x10000U, 0);
|
|
if (autohandle == TC_H_MAKE(TC_H_ROOT, 0))
|
|
autohandle = TC_H_MAKE(0x80000000U, 0);
|
|
if (!qdisc_lookup(dev, autohandle))
|
|
return autohandle;
|
|
cond_resched();
|
|
} while (--i > 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void qdisc_tree_reduce_backlog(struct Qdisc *sch, int n, int len)
|
|
{
|
|
bool qdisc_is_offloaded = sch->flags & TCQ_F_OFFLOADED;
|
|
const struct Qdisc_class_ops *cops;
|
|
unsigned long cl;
|
|
u32 parentid;
|
|
bool notify;
|
|
int drops;
|
|
|
|
if (n == 0 && len == 0)
|
|
return;
|
|
drops = max_t(int, n, 0);
|
|
rcu_read_lock();
|
|
while ((parentid = sch->parent)) {
|
|
if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
|
|
break;
|
|
|
|
if (sch->flags & TCQ_F_NOPARENT)
|
|
break;
|
|
/* Notify parent qdisc only if child qdisc becomes empty.
|
|
*
|
|
* If child was empty even before update then backlog
|
|
* counter is screwed and we skip notification because
|
|
* parent class is already passive.
|
|
*
|
|
* If the original child was offloaded then it is allowed
|
|
* to be seem as empty, so the parent is notified anyway.
|
|
*/
|
|
notify = !sch->q.qlen && !WARN_ON_ONCE(!n &&
|
|
!qdisc_is_offloaded);
|
|
/* TODO: perform the search on a per txq basis */
|
|
sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
|
|
if (sch == NULL) {
|
|
WARN_ON_ONCE(parentid != TC_H_ROOT);
|
|
break;
|
|
}
|
|
cops = sch->ops->cl_ops;
|
|
if (notify && cops->qlen_notify) {
|
|
cl = cops->find(sch, parentid);
|
|
cops->qlen_notify(sch, cl);
|
|
}
|
|
sch->q.qlen -= n;
|
|
sch->qstats.backlog -= len;
|
|
__qdisc_qstats_drop(sch, drops);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(qdisc_tree_reduce_backlog);
|
|
|
|
int qdisc_offload_dump_helper(struct Qdisc *sch, enum tc_setup_type type,
|
|
void *type_data)
|
|
{
|
|
struct net_device *dev = qdisc_dev(sch);
|
|
int err;
|
|
|
|
sch->flags &= ~TCQ_F_OFFLOADED;
|
|
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
|
|
return 0;
|
|
|
|
err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
|
|
if (err == -EOPNOTSUPP)
|
|
return 0;
|
|
|
|
if (!err)
|
|
sch->flags |= TCQ_F_OFFLOADED;
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(qdisc_offload_dump_helper);
|
|
|
|
void qdisc_offload_graft_helper(struct net_device *dev, struct Qdisc *sch,
|
|
struct Qdisc *new, struct Qdisc *old,
|
|
enum tc_setup_type type, void *type_data,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
bool any_qdisc_is_offloaded;
|
|
int err;
|
|
|
|
if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
|
|
return;
|
|
|
|
err = dev->netdev_ops->ndo_setup_tc(dev, type, type_data);
|
|
|
|
/* Don't report error if the graft is part of destroy operation. */
|
|
if (!err || !new || new == &noop_qdisc)
|
|
return;
|
|
|
|
/* Don't report error if the parent, the old child and the new
|
|
* one are not offloaded.
|
|
*/
|
|
any_qdisc_is_offloaded = new->flags & TCQ_F_OFFLOADED;
|
|
any_qdisc_is_offloaded |= sch && sch->flags & TCQ_F_OFFLOADED;
|
|
any_qdisc_is_offloaded |= old && old->flags & TCQ_F_OFFLOADED;
|
|
|
|
if (any_qdisc_is_offloaded)
|
|
NL_SET_ERR_MSG(extack, "Offloading graft operation failed.");
|
|
}
|
|
EXPORT_SYMBOL(qdisc_offload_graft_helper);
|
|
|
|
static void qdisc_offload_graft_root(struct net_device *dev,
|
|
struct Qdisc *new, struct Qdisc *old,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tc_root_qopt_offload graft_offload = {
|
|
.command = TC_ROOT_GRAFT,
|
|
.handle = new ? new->handle : 0,
|
|
.ingress = (new && new->flags & TCQ_F_INGRESS) ||
|
|
(old && old->flags & TCQ_F_INGRESS),
|
|
};
|
|
|
|
qdisc_offload_graft_helper(dev, NULL, new, old,
|
|
TC_SETUP_ROOT_QDISC, &graft_offload, extack);
|
|
}
|
|
|
|
static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
|
|
u32 portid, u32 seq, u16 flags, int event)
|
|
{
|
|
struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
|
|
struct gnet_stats_queue __percpu *cpu_qstats = NULL;
|
|
struct tcmsg *tcm;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct gnet_dump d;
|
|
struct qdisc_size_table *stab;
|
|
u32 block_index;
|
|
__u32 qlen;
|
|
|
|
cond_resched();
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
|
|
if (!nlh)
|
|
goto out_nlmsg_trim;
|
|
tcm = nlmsg_data(nlh);
|
|
tcm->tcm_family = AF_UNSPEC;
|
|
tcm->tcm__pad1 = 0;
|
|
tcm->tcm__pad2 = 0;
|
|
tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
|
|
tcm->tcm_parent = clid;
|
|
tcm->tcm_handle = q->handle;
|
|
tcm->tcm_info = refcount_read(&q->refcnt);
|
|
if (nla_put_string(skb, TCA_KIND, q->ops->id))
|
|
goto nla_put_failure;
|
|
if (q->ops->ingress_block_get) {
|
|
block_index = q->ops->ingress_block_get(q);
|
|
if (block_index &&
|
|
nla_put_u32(skb, TCA_INGRESS_BLOCK, block_index))
|
|
goto nla_put_failure;
|
|
}
|
|
if (q->ops->egress_block_get) {
|
|
block_index = q->ops->egress_block_get(q);
|
|
if (block_index &&
|
|
nla_put_u32(skb, TCA_EGRESS_BLOCK, block_index))
|
|
goto nla_put_failure;
|
|
}
|
|
if (q->ops->dump && q->ops->dump(q, skb) < 0)
|
|
goto nla_put_failure;
|
|
if (nla_put_u8(skb, TCA_HW_OFFLOAD, !!(q->flags & TCQ_F_OFFLOADED)))
|
|
goto nla_put_failure;
|
|
qlen = qdisc_qlen_sum(q);
|
|
|
|
stab = rtnl_dereference(q->stab);
|
|
if (stab && qdisc_dump_stab(skb, stab) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
|
|
NULL, &d, TCA_PAD) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (qdisc_is_percpu_stats(q)) {
|
|
cpu_bstats = q->cpu_bstats;
|
|
cpu_qstats = q->cpu_qstats;
|
|
}
|
|
|
|
if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q),
|
|
&d, cpu_bstats, &q->bstats) < 0 ||
|
|
gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
|
|
gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (gnet_stats_finish_copy(&d) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
out_nlmsg_trim:
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
|
|
{
|
|
if (q->flags & TCQ_F_BUILTIN)
|
|
return true;
|
|
if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static int qdisc_notify(struct net *net, struct sk_buff *oskb,
|
|
struct nlmsghdr *n, u32 clid,
|
|
struct Qdisc *old, struct Qdisc *new)
|
|
{
|
|
struct sk_buff *skb;
|
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
if (old && !tc_qdisc_dump_ignore(old, false)) {
|
|
if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
|
|
0, RTM_DELQDISC) < 0)
|
|
goto err_out;
|
|
}
|
|
if (new && !tc_qdisc_dump_ignore(new, false)) {
|
|
if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
|
|
old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
|
|
goto err_out;
|
|
}
|
|
|
|
if (skb->len)
|
|
return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
|
|
n->nlmsg_flags & NLM_F_ECHO);
|
|
|
|
err_out:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void notify_and_destroy(struct net *net, struct sk_buff *skb,
|
|
struct nlmsghdr *n, u32 clid,
|
|
struct Qdisc *old, struct Qdisc *new)
|
|
{
|
|
if (new || old)
|
|
qdisc_notify(net, skb, n, clid, old, new);
|
|
|
|
if (old)
|
|
qdisc_put(old);
|
|
}
|
|
|
|
static void qdisc_clear_nolock(struct Qdisc *sch)
|
|
{
|
|
sch->flags &= ~TCQ_F_NOLOCK;
|
|
if (!(sch->flags & TCQ_F_CPUSTATS))
|
|
return;
|
|
|
|
free_percpu(sch->cpu_bstats);
|
|
free_percpu(sch->cpu_qstats);
|
|
sch->cpu_bstats = NULL;
|
|
sch->cpu_qstats = NULL;
|
|
sch->flags &= ~TCQ_F_CPUSTATS;
|
|
}
|
|
|
|
/* Graft qdisc "new" to class "classid" of qdisc "parent" or
|
|
* to device "dev".
|
|
*
|
|
* When appropriate send a netlink notification using 'skb'
|
|
* and "n".
|
|
*
|
|
* On success, destroy old qdisc.
|
|
*/
|
|
|
|
static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
|
|
struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
|
|
struct Qdisc *new, struct Qdisc *old,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct Qdisc *q = old;
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (parent == NULL) {
|
|
unsigned int i, num_q, ingress;
|
|
|
|
ingress = 0;
|
|
num_q = dev->num_tx_queues;
|
|
if ((q && q->flags & TCQ_F_INGRESS) ||
|
|
(new && new->flags & TCQ_F_INGRESS)) {
|
|
num_q = 1;
|
|
ingress = 1;
|
|
if (!dev_ingress_queue(dev)) {
|
|
NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
if (dev->flags & IFF_UP)
|
|
dev_deactivate(dev);
|
|
|
|
qdisc_offload_graft_root(dev, new, old, extack);
|
|
|
|
if (new && new->ops->attach)
|
|
goto skip;
|
|
|
|
for (i = 0; i < num_q; i++) {
|
|
struct netdev_queue *dev_queue = dev_ingress_queue(dev);
|
|
|
|
if (!ingress)
|
|
dev_queue = netdev_get_tx_queue(dev, i);
|
|
|
|
old = dev_graft_qdisc(dev_queue, new);
|
|
if (new && i > 0)
|
|
qdisc_refcount_inc(new);
|
|
|
|
if (!ingress)
|
|
qdisc_put(old);
|
|
}
|
|
|
|
skip:
|
|
if (!ingress) {
|
|
notify_and_destroy(net, skb, n, classid,
|
|
dev->qdisc, new);
|
|
if (new && !new->ops->attach)
|
|
qdisc_refcount_inc(new);
|
|
dev->qdisc = new ? : &noop_qdisc;
|
|
|
|
if (new && new->ops->attach)
|
|
new->ops->attach(new);
|
|
} else {
|
|
notify_and_destroy(net, skb, n, classid, old, new);
|
|
}
|
|
|
|
if (dev->flags & IFF_UP)
|
|
dev_activate(dev);
|
|
} else {
|
|
const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
|
|
unsigned long cl;
|
|
int err;
|
|
|
|
/* Only support running class lockless if parent is lockless */
|
|
if (new && (new->flags & TCQ_F_NOLOCK) &&
|
|
parent && !(parent->flags & TCQ_F_NOLOCK))
|
|
qdisc_clear_nolock(new);
|
|
|
|
if (!cops || !cops->graft)
|
|
return -EOPNOTSUPP;
|
|
|
|
cl = cops->find(parent, classid);
|
|
if (!cl) {
|
|
NL_SET_ERR_MSG(extack, "Specified class not found");
|
|
return -ENOENT;
|
|
}
|
|
|
|
err = cops->graft(parent, cl, new, &old, extack);
|
|
if (err)
|
|
return err;
|
|
notify_and_destroy(net, skb, n, classid, old, new);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int qdisc_block_indexes_set(struct Qdisc *sch, struct nlattr **tca,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
u32 block_index;
|
|
|
|
if (tca[TCA_INGRESS_BLOCK]) {
|
|
block_index = nla_get_u32(tca[TCA_INGRESS_BLOCK]);
|
|
|
|
if (!block_index) {
|
|
NL_SET_ERR_MSG(extack, "Ingress block index cannot be 0");
|
|
return -EINVAL;
|
|
}
|
|
if (!sch->ops->ingress_block_set) {
|
|
NL_SET_ERR_MSG(extack, "Ingress block sharing is not supported");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
sch->ops->ingress_block_set(sch, block_index);
|
|
}
|
|
if (tca[TCA_EGRESS_BLOCK]) {
|
|
block_index = nla_get_u32(tca[TCA_EGRESS_BLOCK]);
|
|
|
|
if (!block_index) {
|
|
NL_SET_ERR_MSG(extack, "Egress block index cannot be 0");
|
|
return -EINVAL;
|
|
}
|
|
if (!sch->ops->egress_block_set) {
|
|
NL_SET_ERR_MSG(extack, "Egress block sharing is not supported");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
sch->ops->egress_block_set(sch, block_index);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
Allocate and initialize new qdisc.
|
|
|
|
Parameters are passed via opt.
|
|
*/
|
|
|
|
static struct Qdisc *qdisc_create(struct net_device *dev,
|
|
struct netdev_queue *dev_queue,
|
|
struct Qdisc *p, u32 parent, u32 handle,
|
|
struct nlattr **tca, int *errp,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
int err;
|
|
struct nlattr *kind = tca[TCA_KIND];
|
|
struct Qdisc *sch;
|
|
struct Qdisc_ops *ops;
|
|
struct qdisc_size_table *stab;
|
|
|
|
ops = qdisc_lookup_ops(kind);
|
|
#ifdef CONFIG_MODULES
|
|
if (ops == NULL && kind != NULL) {
|
|
char name[IFNAMSIZ];
|
|
if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
|
|
/* We dropped the RTNL semaphore in order to
|
|
* perform the module load. So, even if we
|
|
* succeeded in loading the module we have to
|
|
* tell the caller to replay the request. We
|
|
* indicate this using -EAGAIN.
|
|
* We replay the request because the device may
|
|
* go away in the mean time.
|
|
*/
|
|
rtnl_unlock();
|
|
request_module("sch_%s", name);
|
|
rtnl_lock();
|
|
ops = qdisc_lookup_ops(kind);
|
|
if (ops != NULL) {
|
|
/* We will try again qdisc_lookup_ops,
|
|
* so don't keep a reference.
|
|
*/
|
|
module_put(ops->owner);
|
|
err = -EAGAIN;
|
|
goto err_out;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
err = -ENOENT;
|
|
if (!ops) {
|
|
NL_SET_ERR_MSG(extack, "Specified qdisc not found");
|
|
goto err_out;
|
|
}
|
|
|
|
sch = qdisc_alloc(dev_queue, ops, extack);
|
|
if (IS_ERR(sch)) {
|
|
err = PTR_ERR(sch);
|
|
goto err_out2;
|
|
}
|
|
|
|
sch->parent = parent;
|
|
|
|
if (handle == TC_H_INGRESS) {
|
|
sch->flags |= TCQ_F_INGRESS;
|
|
handle = TC_H_MAKE(TC_H_INGRESS, 0);
|
|
} else {
|
|
if (handle == 0) {
|
|
handle = qdisc_alloc_handle(dev);
|
|
if (handle == 0) {
|
|
NL_SET_ERR_MSG(extack, "Maximum number of qdisc handles was exceeded");
|
|
err = -ENOSPC;
|
|
goto err_out3;
|
|
}
|
|
}
|
|
if (!netif_is_multiqueue(dev))
|
|
sch->flags |= TCQ_F_ONETXQUEUE;
|
|
}
|
|
|
|
sch->handle = handle;
|
|
|
|
/* This exist to keep backward compatible with a userspace
|
|
* loophole, what allowed userspace to get IFF_NO_QUEUE
|
|
* facility on older kernels by setting tx_queue_len=0 (prior
|
|
* to qdisc init), and then forgot to reinit tx_queue_len
|
|
* before again attaching a qdisc.
|
|
*/
|
|
if ((dev->priv_flags & IFF_NO_QUEUE) && (dev->tx_queue_len == 0)) {
|
|
dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
|
|
netdev_info(dev, "Caught tx_queue_len zero misconfig\n");
|
|
}
|
|
|
|
err = qdisc_block_indexes_set(sch, tca, extack);
|
|
if (err)
|
|
goto err_out3;
|
|
|
|
if (ops->init) {
|
|
err = ops->init(sch, tca[TCA_OPTIONS], extack);
|
|
if (err != 0)
|
|
goto err_out5;
|
|
}
|
|
|
|
if (tca[TCA_STAB]) {
|
|
stab = qdisc_get_stab(tca[TCA_STAB], extack);
|
|
if (IS_ERR(stab)) {
|
|
err = PTR_ERR(stab);
|
|
goto err_out4;
|
|
}
|
|
rcu_assign_pointer(sch->stab, stab);
|
|
}
|
|
if (tca[TCA_RATE]) {
|
|
seqcount_t *running;
|
|
|
|
err = -EOPNOTSUPP;
|
|
if (sch->flags & TCQ_F_MQROOT) {
|
|
NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc");
|
|
goto err_out4;
|
|
}
|
|
|
|
if (sch->parent != TC_H_ROOT &&
|
|
!(sch->flags & TCQ_F_INGRESS) &&
|
|
(!p || !(p->flags & TCQ_F_MQROOT)))
|
|
running = qdisc_root_sleeping_running(sch);
|
|
else
|
|
running = &sch->running;
|
|
|
|
err = gen_new_estimator(&sch->bstats,
|
|
sch->cpu_bstats,
|
|
&sch->rate_est,
|
|
NULL,
|
|
running,
|
|
tca[TCA_RATE]);
|
|
if (err) {
|
|
NL_SET_ERR_MSG(extack, "Failed to generate new estimator");
|
|
goto err_out4;
|
|
}
|
|
}
|
|
|
|
qdisc_hash_add(sch, false);
|
|
|
|
return sch;
|
|
|
|
err_out5:
|
|
/* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
|
|
if (ops->destroy)
|
|
ops->destroy(sch);
|
|
err_out3:
|
|
dev_put(dev);
|
|
qdisc_free(sch);
|
|
err_out2:
|
|
module_put(ops->owner);
|
|
err_out:
|
|
*errp = err;
|
|
return NULL;
|
|
|
|
err_out4:
|
|
/*
|
|
* Any broken qdiscs that would require a ops->reset() here?
|
|
* The qdisc was never in action so it shouldn't be necessary.
|
|
*/
|
|
qdisc_put_stab(rtnl_dereference(sch->stab));
|
|
if (ops->destroy)
|
|
ops->destroy(sch);
|
|
goto err_out3;
|
|
}
|
|
|
|
static int qdisc_change(struct Qdisc *sch, struct nlattr **tca,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct qdisc_size_table *ostab, *stab = NULL;
|
|
int err = 0;
|
|
|
|
if (tca[TCA_OPTIONS]) {
|
|
if (!sch->ops->change) {
|
|
NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc");
|
|
return -EINVAL;
|
|
}
|
|
if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
|
|
NL_SET_ERR_MSG(extack, "Change of blocks is not supported");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
err = sch->ops->change(sch, tca[TCA_OPTIONS], extack);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (tca[TCA_STAB]) {
|
|
stab = qdisc_get_stab(tca[TCA_STAB], extack);
|
|
if (IS_ERR(stab))
|
|
return PTR_ERR(stab);
|
|
}
|
|
|
|
ostab = rtnl_dereference(sch->stab);
|
|
rcu_assign_pointer(sch->stab, stab);
|
|
qdisc_put_stab(ostab);
|
|
|
|
if (tca[TCA_RATE]) {
|
|
/* NB: ignores errors from replace_estimator
|
|
because change can't be undone. */
|
|
if (sch->flags & TCQ_F_MQROOT)
|
|
goto out;
|
|
gen_replace_estimator(&sch->bstats,
|
|
sch->cpu_bstats,
|
|
&sch->rate_est,
|
|
NULL,
|
|
qdisc_root_sleeping_running(sch),
|
|
tca[TCA_RATE]);
|
|
}
|
|
out:
|
|
return 0;
|
|
}
|
|
|
|
struct check_loop_arg {
|
|
struct qdisc_walker w;
|
|
struct Qdisc *p;
|
|
int depth;
|
|
};
|
|
|
|
static int check_loop_fn(struct Qdisc *q, unsigned long cl,
|
|
struct qdisc_walker *w);
|
|
|
|
static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth)
|
|
{
|
|
struct check_loop_arg arg;
|
|
|
|
if (q->ops->cl_ops == NULL)
|
|
return 0;
|
|
|
|
arg.w.stop = arg.w.skip = arg.w.count = 0;
|
|
arg.w.fn = check_loop_fn;
|
|
arg.depth = depth;
|
|
arg.p = p;
|
|
q->ops->cl_ops->walk(q, &arg.w);
|
|
return arg.w.stop ? -ELOOP : 0;
|
|
}
|
|
|
|
static int
|
|
check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w)
|
|
{
|
|
struct Qdisc *leaf;
|
|
const struct Qdisc_class_ops *cops = q->ops->cl_ops;
|
|
struct check_loop_arg *arg = (struct check_loop_arg *)w;
|
|
|
|
leaf = cops->leaf(q, cl);
|
|
if (leaf) {
|
|
if (leaf == arg->p || arg->depth > 7)
|
|
return -ELOOP;
|
|
return check_loop(leaf, arg->p, arg->depth + 1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const struct nla_policy rtm_tca_policy[TCA_MAX + 1] = {
|
|
[TCA_KIND] = { .type = NLA_STRING },
|
|
[TCA_RATE] = { .type = NLA_BINARY,
|
|
.len = sizeof(struct tc_estimator) },
|
|
[TCA_STAB] = { .type = NLA_NESTED },
|
|
[TCA_DUMP_INVISIBLE] = { .type = NLA_FLAG },
|
|
[TCA_CHAIN] = { .type = NLA_U32 },
|
|
[TCA_INGRESS_BLOCK] = { .type = NLA_U32 },
|
|
[TCA_EGRESS_BLOCK] = { .type = NLA_U32 },
|
|
};
|
|
|
|
/*
|
|
* Delete/get qdisc.
|
|
*/
|
|
|
|
static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tcmsg *tcm = nlmsg_data(n);
|
|
struct nlattr *tca[TCA_MAX + 1];
|
|
struct net_device *dev;
|
|
u32 clid;
|
|
struct Qdisc *q = NULL;
|
|
struct Qdisc *p = NULL;
|
|
int err;
|
|
|
|
if ((n->nlmsg_type != RTM_GETQDISC) &&
|
|
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
|
|
rtm_tca_policy, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
dev = __dev_get_by_index(net, tcm->tcm_ifindex);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
clid = tcm->tcm_parent;
|
|
if (clid) {
|
|
if (clid != TC_H_ROOT) {
|
|
if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
|
|
p = qdisc_lookup(dev, TC_H_MAJ(clid));
|
|
if (!p) {
|
|
NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid");
|
|
return -ENOENT;
|
|
}
|
|
q = qdisc_leaf(p, clid);
|
|
} else if (dev_ingress_queue(dev)) {
|
|
q = dev_ingress_queue(dev)->qdisc_sleeping;
|
|
}
|
|
} else {
|
|
q = dev->qdisc;
|
|
}
|
|
if (!q) {
|
|
NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (tcm->tcm_handle && q->handle != tcm->tcm_handle) {
|
|
NL_SET_ERR_MSG(extack, "Invalid handle");
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
q = qdisc_lookup(dev, tcm->tcm_handle);
|
|
if (!q) {
|
|
NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle");
|
|
return -ENOENT;
|
|
}
|
|
}
|
|
|
|
if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
|
|
NL_SET_ERR_MSG(extack, "Invalid qdisc name");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (n->nlmsg_type == RTM_DELQDISC) {
|
|
if (!clid) {
|
|
NL_SET_ERR_MSG(extack, "Classid cannot be zero");
|
|
return -EINVAL;
|
|
}
|
|
if (q->handle == 0) {
|
|
NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero");
|
|
return -ENOENT;
|
|
}
|
|
err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack);
|
|
if (err != 0)
|
|
return err;
|
|
} else {
|
|
qdisc_notify(net, skb, n, clid, NULL, q);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Create/change qdisc.
|
|
*/
|
|
|
|
static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tcmsg *tcm;
|
|
struct nlattr *tca[TCA_MAX + 1];
|
|
struct net_device *dev;
|
|
u32 clid;
|
|
struct Qdisc *q, *p;
|
|
int err;
|
|
|
|
if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
replay:
|
|
/* Reinit, just in case something touches this. */
|
|
err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
|
|
rtm_tca_policy, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
tcm = nlmsg_data(n);
|
|
clid = tcm->tcm_parent;
|
|
q = p = NULL;
|
|
|
|
dev = __dev_get_by_index(net, tcm->tcm_ifindex);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
|
|
if (clid) {
|
|
if (clid != TC_H_ROOT) {
|
|
if (clid != TC_H_INGRESS) {
|
|
p = qdisc_lookup(dev, TC_H_MAJ(clid));
|
|
if (!p) {
|
|
NL_SET_ERR_MSG(extack, "Failed to find specified qdisc");
|
|
return -ENOENT;
|
|
}
|
|
q = qdisc_leaf(p, clid);
|
|
} else if (dev_ingress_queue_create(dev)) {
|
|
q = dev_ingress_queue(dev)->qdisc_sleeping;
|
|
}
|
|
} else {
|
|
q = dev->qdisc;
|
|
}
|
|
|
|
/* It may be default qdisc, ignore it */
|
|
if (q && q->handle == 0)
|
|
q = NULL;
|
|
|
|
if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) {
|
|
if (tcm->tcm_handle) {
|
|
if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) {
|
|
NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override");
|
|
return -EEXIST;
|
|
}
|
|
if (TC_H_MIN(tcm->tcm_handle)) {
|
|
NL_SET_ERR_MSG(extack, "Invalid minor handle");
|
|
return -EINVAL;
|
|
}
|
|
q = qdisc_lookup(dev, tcm->tcm_handle);
|
|
if (!q)
|
|
goto create_n_graft;
|
|
if (n->nlmsg_flags & NLM_F_EXCL) {
|
|
NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override");
|
|
return -EEXIST;
|
|
}
|
|
if (tca[TCA_KIND] &&
|
|
nla_strcmp(tca[TCA_KIND], q->ops->id)) {
|
|
NL_SET_ERR_MSG(extack, "Invalid qdisc name");
|
|
return -EINVAL;
|
|
}
|
|
if (q == p ||
|
|
(p && check_loop(q, p, 0))) {
|
|
NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected");
|
|
return -ELOOP;
|
|
}
|
|
qdisc_refcount_inc(q);
|
|
goto graft;
|
|
} else {
|
|
if (!q)
|
|
goto create_n_graft;
|
|
|
|
/* This magic test requires explanation.
|
|
*
|
|
* We know, that some child q is already
|
|
* attached to this parent and have choice:
|
|
* either to change it or to create/graft new one.
|
|
*
|
|
* 1. We are allowed to create/graft only
|
|
* if CREATE and REPLACE flags are set.
|
|
*
|
|
* 2. If EXCL is set, requestor wanted to say,
|
|
* that qdisc tcm_handle is not expected
|
|
* to exist, so that we choose create/graft too.
|
|
*
|
|
* 3. The last case is when no flags are set.
|
|
* Alas, it is sort of hole in API, we
|
|
* cannot decide what to do unambiguously.
|
|
* For now we select create/graft, if
|
|
* user gave KIND, which does not match existing.
|
|
*/
|
|
if ((n->nlmsg_flags & NLM_F_CREATE) &&
|
|
(n->nlmsg_flags & NLM_F_REPLACE) &&
|
|
((n->nlmsg_flags & NLM_F_EXCL) ||
|
|
(tca[TCA_KIND] &&
|
|
nla_strcmp(tca[TCA_KIND], q->ops->id))))
|
|
goto create_n_graft;
|
|
}
|
|
}
|
|
} else {
|
|
if (!tcm->tcm_handle) {
|
|
NL_SET_ERR_MSG(extack, "Handle cannot be zero");
|
|
return -EINVAL;
|
|
}
|
|
q = qdisc_lookup(dev, tcm->tcm_handle);
|
|
}
|
|
|
|
/* Change qdisc parameters */
|
|
if (!q) {
|
|
NL_SET_ERR_MSG(extack, "Specified qdisc not found");
|
|
return -ENOENT;
|
|
}
|
|
if (n->nlmsg_flags & NLM_F_EXCL) {
|
|
NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify");
|
|
return -EEXIST;
|
|
}
|
|
if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) {
|
|
NL_SET_ERR_MSG(extack, "Invalid qdisc name");
|
|
return -EINVAL;
|
|
}
|
|
err = qdisc_change(q, tca, extack);
|
|
if (err == 0)
|
|
qdisc_notify(net, skb, n, clid, NULL, q);
|
|
return err;
|
|
|
|
create_n_graft:
|
|
if (!(n->nlmsg_flags & NLM_F_CREATE)) {
|
|
NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag");
|
|
return -ENOENT;
|
|
}
|
|
if (clid == TC_H_INGRESS) {
|
|
if (dev_ingress_queue(dev)) {
|
|
q = qdisc_create(dev, dev_ingress_queue(dev), p,
|
|
tcm->tcm_parent, tcm->tcm_parent,
|
|
tca, &err, extack);
|
|
} else {
|
|
NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device");
|
|
err = -ENOENT;
|
|
}
|
|
} else {
|
|
struct netdev_queue *dev_queue;
|
|
|
|
if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
|
|
dev_queue = p->ops->cl_ops->select_queue(p, tcm);
|
|
else if (p)
|
|
dev_queue = p->dev_queue;
|
|
else
|
|
dev_queue = netdev_get_tx_queue(dev, 0);
|
|
|
|
q = qdisc_create(dev, dev_queue, p,
|
|
tcm->tcm_parent, tcm->tcm_handle,
|
|
tca, &err, extack);
|
|
}
|
|
if (q == NULL) {
|
|
if (err == -EAGAIN)
|
|
goto replay;
|
|
return err;
|
|
}
|
|
|
|
graft:
|
|
err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
|
|
if (err) {
|
|
if (q)
|
|
qdisc_put(q);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
int *q_idx_p, int s_q_idx, bool recur,
|
|
bool dump_invisible)
|
|
{
|
|
int ret = 0, q_idx = *q_idx_p;
|
|
struct Qdisc *q;
|
|
int b;
|
|
|
|
if (!root)
|
|
return 0;
|
|
|
|
q = root;
|
|
if (q_idx < s_q_idx) {
|
|
q_idx++;
|
|
} else {
|
|
if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
|
|
tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
RTM_NEWQDISC) <= 0)
|
|
goto done;
|
|
q_idx++;
|
|
}
|
|
|
|
/* If dumping singletons, there is no qdisc_dev(root) and the singleton
|
|
* itself has already been dumped.
|
|
*
|
|
* If we've already dumped the top-level (ingress) qdisc above and the global
|
|
* qdisc hashtable, we don't want to hit it again
|
|
*/
|
|
if (!qdisc_dev(root) || !recur)
|
|
goto out;
|
|
|
|
hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
|
|
if (q_idx < s_q_idx) {
|
|
q_idx++;
|
|
continue;
|
|
}
|
|
if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
|
|
tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
RTM_NEWQDISC) <= 0)
|
|
goto done;
|
|
q_idx++;
|
|
}
|
|
|
|
out:
|
|
*q_idx_p = q_idx;
|
|
return ret;
|
|
done:
|
|
ret = -1;
|
|
goto out;
|
|
}
|
|
|
|
static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
int idx, q_idx;
|
|
int s_idx, s_q_idx;
|
|
struct net_device *dev;
|
|
const struct nlmsghdr *nlh = cb->nlh;
|
|
struct nlattr *tca[TCA_MAX + 1];
|
|
int err;
|
|
|
|
s_idx = cb->args[0];
|
|
s_q_idx = q_idx = cb->args[1];
|
|
|
|
idx = 0;
|
|
ASSERT_RTNL();
|
|
|
|
err = nlmsg_parse_deprecated(nlh, sizeof(struct tcmsg), tca, TCA_MAX,
|
|
rtm_tca_policy, cb->extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
for_each_netdev(net, dev) {
|
|
struct netdev_queue *dev_queue;
|
|
|
|
if (idx < s_idx)
|
|
goto cont;
|
|
if (idx > s_idx)
|
|
s_q_idx = 0;
|
|
q_idx = 0;
|
|
|
|
if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx,
|
|
true, tca[TCA_DUMP_INVISIBLE]) < 0)
|
|
goto done;
|
|
|
|
dev_queue = dev_ingress_queue(dev);
|
|
if (dev_queue &&
|
|
tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
|
|
&q_idx, s_q_idx, false,
|
|
tca[TCA_DUMP_INVISIBLE]) < 0)
|
|
goto done;
|
|
|
|
cont:
|
|
idx++;
|
|
}
|
|
|
|
done:
|
|
cb->args[0] = idx;
|
|
cb->args[1] = q_idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
|
|
|
|
/************************************************
|
|
* Traffic classes manipulation. *
|
|
************************************************/
|
|
|
|
static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
|
|
unsigned long cl,
|
|
u32 portid, u32 seq, u16 flags, int event)
|
|
{
|
|
struct tcmsg *tcm;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct gnet_dump d;
|
|
const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
|
|
|
|
cond_resched();
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
|
|
if (!nlh)
|
|
goto out_nlmsg_trim;
|
|
tcm = nlmsg_data(nlh);
|
|
tcm->tcm_family = AF_UNSPEC;
|
|
tcm->tcm__pad1 = 0;
|
|
tcm->tcm__pad2 = 0;
|
|
tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
|
|
tcm->tcm_parent = q->handle;
|
|
tcm->tcm_handle = q->handle;
|
|
tcm->tcm_info = 0;
|
|
if (nla_put_string(skb, TCA_KIND, q->ops->id))
|
|
goto nla_put_failure;
|
|
if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
|
|
NULL, &d, TCA_PAD) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (gnet_stats_finish_copy(&d) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
out_nlmsg_trim:
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int tclass_notify(struct net *net, struct sk_buff *oskb,
|
|
struct nlmsghdr *n, struct Qdisc *q,
|
|
unsigned long cl, int event)
|
|
{
|
|
struct sk_buff *skb;
|
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
|
|
int err = 0;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
|
|
n->nlmsg_flags & NLM_F_ECHO);
|
|
if (err > 0)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
static int tclass_del_notify(struct net *net,
|
|
const struct Qdisc_class_ops *cops,
|
|
struct sk_buff *oskb, struct nlmsghdr *n,
|
|
struct Qdisc *q, unsigned long cl)
|
|
{
|
|
u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
|
|
struct sk_buff *skb;
|
|
int err = 0;
|
|
|
|
if (!cops->delete)
|
|
return -EOPNOTSUPP;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb)
|
|
return -ENOBUFS;
|
|
|
|
if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0,
|
|
RTM_DELTCLASS) < 0) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = cops->delete(q, cl);
|
|
if (err) {
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
err = rtnetlink_send(skb, net, portid, RTNLGRP_TC,
|
|
n->nlmsg_flags & NLM_F_ECHO);
|
|
if (err > 0)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_CLS
|
|
|
|
struct tcf_bind_args {
|
|
struct tcf_walker w;
|
|
u32 classid;
|
|
unsigned long cl;
|
|
};
|
|
|
|
static int tcf_node_bind(struct tcf_proto *tp, void *n, struct tcf_walker *arg)
|
|
{
|
|
struct tcf_bind_args *a = (void *)arg;
|
|
|
|
if (tp->ops->bind_class) {
|
|
struct Qdisc *q = tcf_block_q(tp->chain->block);
|
|
|
|
sch_tree_lock(q);
|
|
tp->ops->bind_class(n, a->classid, a->cl);
|
|
sch_tree_unlock(q);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
|
|
unsigned long new_cl)
|
|
{
|
|
const struct Qdisc_class_ops *cops = q->ops->cl_ops;
|
|
struct tcf_block *block;
|
|
struct tcf_chain *chain;
|
|
unsigned long cl;
|
|
|
|
cl = cops->find(q, portid);
|
|
if (!cl)
|
|
return;
|
|
if (!cops->tcf_block)
|
|
return;
|
|
block = cops->tcf_block(q, cl, NULL);
|
|
if (!block)
|
|
return;
|
|
for (chain = tcf_get_next_chain(block, NULL);
|
|
chain;
|
|
chain = tcf_get_next_chain(block, chain)) {
|
|
struct tcf_proto *tp;
|
|
|
|
for (tp = tcf_get_next_proto(chain, NULL, true);
|
|
tp; tp = tcf_get_next_proto(chain, tp, true)) {
|
|
struct tcf_bind_args arg = {};
|
|
|
|
arg.w.fn = tcf_node_bind;
|
|
arg.classid = clid;
|
|
arg.cl = new_cl;
|
|
tp->ops->walk(tp, &arg.w, true);
|
|
}
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
static void tc_bind_tclass(struct Qdisc *q, u32 portid, u32 clid,
|
|
unsigned long new_cl)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tcmsg *tcm = nlmsg_data(n);
|
|
struct nlattr *tca[TCA_MAX + 1];
|
|
struct net_device *dev;
|
|
struct Qdisc *q = NULL;
|
|
const struct Qdisc_class_ops *cops;
|
|
unsigned long cl = 0;
|
|
unsigned long new_cl;
|
|
u32 portid;
|
|
u32 clid;
|
|
u32 qid;
|
|
int err;
|
|
|
|
if ((n->nlmsg_type != RTM_GETTCLASS) &&
|
|
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
err = nlmsg_parse_deprecated(n, sizeof(*tcm), tca, TCA_MAX,
|
|
rtm_tca_policy, extack);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
dev = __dev_get_by_index(net, tcm->tcm_ifindex);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
parent == TC_H_UNSPEC - unspecified parent.
|
|
parent == TC_H_ROOT - class is root, which has no parent.
|
|
parent == X:0 - parent is root class.
|
|
parent == X:Y - parent is a node in hierarchy.
|
|
parent == 0:Y - parent is X:Y, where X:0 is qdisc.
|
|
|
|
handle == 0:0 - generate handle from kernel pool.
|
|
handle == 0:Y - class is X:Y, where X:0 is qdisc.
|
|
handle == X:Y - clear.
|
|
handle == X:0 - root class.
|
|
*/
|
|
|
|
/* Step 1. Determine qdisc handle X:0 */
|
|
|
|
portid = tcm->tcm_parent;
|
|
clid = tcm->tcm_handle;
|
|
qid = TC_H_MAJ(clid);
|
|
|
|
if (portid != TC_H_ROOT) {
|
|
u32 qid1 = TC_H_MAJ(portid);
|
|
|
|
if (qid && qid1) {
|
|
/* If both majors are known, they must be identical. */
|
|
if (qid != qid1)
|
|
return -EINVAL;
|
|
} else if (qid1) {
|
|
qid = qid1;
|
|
} else if (qid == 0)
|
|
qid = dev->qdisc->handle;
|
|
|
|
/* Now qid is genuine qdisc handle consistent
|
|
* both with parent and child.
|
|
*
|
|
* TC_H_MAJ(portid) still may be unspecified, complete it now.
|
|
*/
|
|
if (portid)
|
|
portid = TC_H_MAKE(qid, portid);
|
|
} else {
|
|
if (qid == 0)
|
|
qid = dev->qdisc->handle;
|
|
}
|
|
|
|
/* OK. Locate qdisc */
|
|
q = qdisc_lookup(dev, qid);
|
|
if (!q)
|
|
return -ENOENT;
|
|
|
|
/* An check that it supports classes */
|
|
cops = q->ops->cl_ops;
|
|
if (cops == NULL)
|
|
return -EINVAL;
|
|
|
|
/* Now try to get class */
|
|
if (clid == 0) {
|
|
if (portid == TC_H_ROOT)
|
|
clid = qid;
|
|
} else
|
|
clid = TC_H_MAKE(qid, clid);
|
|
|
|
if (clid)
|
|
cl = cops->find(q, clid);
|
|
|
|
if (cl == 0) {
|
|
err = -ENOENT;
|
|
if (n->nlmsg_type != RTM_NEWTCLASS ||
|
|
!(n->nlmsg_flags & NLM_F_CREATE))
|
|
goto out;
|
|
} else {
|
|
switch (n->nlmsg_type) {
|
|
case RTM_NEWTCLASS:
|
|
err = -EEXIST;
|
|
if (n->nlmsg_flags & NLM_F_EXCL)
|
|
goto out;
|
|
break;
|
|
case RTM_DELTCLASS:
|
|
err = tclass_del_notify(net, cops, skb, n, q, cl);
|
|
/* Unbind the class with flilters with 0 */
|
|
tc_bind_tclass(q, portid, clid, 0);
|
|
goto out;
|
|
case RTM_GETTCLASS:
|
|
err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
|
|
goto out;
|
|
default:
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (tca[TCA_INGRESS_BLOCK] || tca[TCA_EGRESS_BLOCK]) {
|
|
NL_SET_ERR_MSG(extack, "Shared blocks are not supported for classes");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
new_cl = cl;
|
|
err = -EOPNOTSUPP;
|
|
if (cops->change)
|
|
err = cops->change(q, clid, portid, tca, &new_cl, extack);
|
|
if (err == 0) {
|
|
tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
|
|
/* We just create a new class, need to do reverse binding. */
|
|
if (cl != new_cl)
|
|
tc_bind_tclass(q, portid, clid, new_cl);
|
|
}
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
struct qdisc_dump_args {
|
|
struct qdisc_walker w;
|
|
struct sk_buff *skb;
|
|
struct netlink_callback *cb;
|
|
};
|
|
|
|
static int qdisc_class_dump(struct Qdisc *q, unsigned long cl,
|
|
struct qdisc_walker *arg)
|
|
{
|
|
struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;
|
|
|
|
return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
|
|
a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
RTM_NEWTCLASS);
|
|
}
|
|
|
|
static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb,
|
|
struct tcmsg *tcm, struct netlink_callback *cb,
|
|
int *t_p, int s_t)
|
|
{
|
|
struct qdisc_dump_args arg;
|
|
|
|
if (tc_qdisc_dump_ignore(q, false) ||
|
|
*t_p < s_t || !q->ops->cl_ops ||
|
|
(tcm->tcm_parent &&
|
|
TC_H_MAJ(tcm->tcm_parent) != q->handle)) {
|
|
(*t_p)++;
|
|
return 0;
|
|
}
|
|
if (*t_p > s_t)
|
|
memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0]));
|
|
arg.w.fn = qdisc_class_dump;
|
|
arg.skb = skb;
|
|
arg.cb = cb;
|
|
arg.w.stop = 0;
|
|
arg.w.skip = cb->args[1];
|
|
arg.w.count = 0;
|
|
q->ops->cl_ops->walk(q, &arg.w);
|
|
cb->args[1] = arg.w.count;
|
|
if (arg.w.stop)
|
|
return -1;
|
|
(*t_p)++;
|
|
return 0;
|
|
}
|
|
|
|
static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb,
|
|
struct tcmsg *tcm, struct netlink_callback *cb,
|
|
int *t_p, int s_t)
|
|
{
|
|
struct Qdisc *q;
|
|
int b;
|
|
|
|
if (!root)
|
|
return 0;
|
|
|
|
if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
|
|
return -1;
|
|
|
|
if (!qdisc_dev(root))
|
|
return 0;
|
|
|
|
if (tcm->tcm_parent) {
|
|
q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
|
|
if (q && q != root &&
|
|
tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
|
|
if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct tcmsg *tcm = nlmsg_data(cb->nlh);
|
|
struct net *net = sock_net(skb->sk);
|
|
struct netdev_queue *dev_queue;
|
|
struct net_device *dev;
|
|
int t, s_t;
|
|
|
|
if (nlmsg_len(cb->nlh) < sizeof(*tcm))
|
|
return 0;
|
|
dev = dev_get_by_index(net, tcm->tcm_ifindex);
|
|
if (!dev)
|
|
return 0;
|
|
|
|
s_t = cb->args[0];
|
|
t = 0;
|
|
|
|
if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
|
|
goto done;
|
|
|
|
dev_queue = dev_ingress_queue(dev);
|
|
if (dev_queue &&
|
|
tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
|
|
&t, s_t) < 0)
|
|
goto done;
|
|
|
|
done:
|
|
cb->args[0] = t;
|
|
|
|
dev_put(dev);
|
|
return skb->len;
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static int psched_show(struct seq_file *seq, void *v)
|
|
{
|
|
seq_printf(seq, "%08x %08x %08x %08x\n",
|
|
(u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
|
|
1000000,
|
|
(u32)NSEC_PER_SEC / hrtimer_resolution);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __net_init psched_net_init(struct net *net)
|
|
{
|
|
struct proc_dir_entry *e;
|
|
|
|
e = proc_create_single("psched", 0, net->proc_net, psched_show);
|
|
if (e == NULL)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit psched_net_exit(struct net *net)
|
|
{
|
|
remove_proc_entry("psched", net->proc_net);
|
|
}
|
|
#else
|
|
static int __net_init psched_net_init(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit psched_net_exit(struct net *net)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static struct pernet_operations psched_net_ops = {
|
|
.init = psched_net_init,
|
|
.exit = psched_net_exit,
|
|
};
|
|
|
|
static int __init pktsched_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = register_pernet_subsys(&psched_net_ops);
|
|
if (err) {
|
|
pr_err("pktsched_init: "
|
|
"cannot initialize per netns operations\n");
|
|
return err;
|
|
}
|
|
|
|
register_qdisc(&pfifo_fast_ops);
|
|
register_qdisc(&pfifo_qdisc_ops);
|
|
register_qdisc(&bfifo_qdisc_ops);
|
|
register_qdisc(&pfifo_head_drop_qdisc_ops);
|
|
register_qdisc(&mq_qdisc_ops);
|
|
register_qdisc(&noqueue_qdisc_ops);
|
|
|
|
rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, 0);
|
|
rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, 0);
|
|
rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc,
|
|
0);
|
|
rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, 0);
|
|
rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, 0);
|
|
rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass,
|
|
0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(pktsched_init);
|