sch_api.c 45.6 KB
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/*
 * net/sched/sch_api.c	Packet scheduler API.
 *
 *		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:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
 *
 * Fixes:
 *
 * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired.
 * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support
 * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/kmod.h>
#include <linux/list.h>
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#include <linux/hrtimer.h>
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#include <linux/lockdep.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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static int qdisc_notify(struct net *net, struct sk_buff *oskb,
			struct nlmsghdr *n, u32 clid,
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			struct Qdisc *old, struct Qdisc *new);
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static int tclass_notify(struct net *net, struct sk_buff *oskb,
			 struct nlmsghdr *n, struct Qdisc *q,
			 unsigned long cl, int event);
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/*

   Short review.
   -------------

   This file consists of two interrelated parts:

   1. queueing disciplines manager frontend.
   2. traffic classes manager frontend.

   Generally, queueing discipline ("qdisc") is a black box,
   which is able to enqueue packets and to dequeue them (when
   device is ready to send something) in order and at times
   determined by algorithm hidden in it.

   qdisc's are divided to two categories:
   - "queues", which have no internal structure visible from outside.
   - "schedulers", which split all the packets to "traffic classes",
     using "packet classifiers" (look at cls_api.c)

   In turn, classes may have child qdiscs (as rule, queues)
   attached to them etc. etc. etc.

   The goal of the routines in this file is to translate
   information supplied by user in the form of handles
   to more intelligible for kernel form, to make some sanity
   checks and part of work, which is common to all qdiscs
   and to provide rtnetlink notifications.

   All real intelligent work is done inside qdisc modules.



   Every discipline has two major routines: enqueue and dequeue.

   ---dequeue

   dequeue usually returns a skb to send. It is allowed to return NULL,
   but it does not mean that queue is empty, it just means that
   discipline does not want to send anything this time.
   Queue is really empty if q->q.qlen == 0.
   For complicated disciplines with multiple queues q->q is not
   real packet queue, but however q->q.qlen must be valid.

   ---enqueue

   enqueue returns 0, if packet was enqueued successfully.
   If packet (this one or another one) was dropped, it returns
   not zero error code.
   NET_XMIT_DROP 	- this packet dropped
     Expected action: do not backoff, but wait until queue will clear.
   NET_XMIT_CN	 	- probably this packet enqueued, but another one dropped.
     Expected action: backoff or ignore

   Auxiliary routines:

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   ---peek

   like dequeue but without removing a packet from the queue

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   ---reset

   returns qdisc to initial state: purge all buffers, clear all
   timers, counters (except for statistics) etc.

   ---init

   initializes newly created qdisc.

   ---destroy

   destroys resources allocated by init and during lifetime of qdisc.

   ---change

   changes qdisc parameters.
 */

/* Protects list of registered TC modules. It is pure SMP lock. */
static DEFINE_RWLOCK(qdisc_mod_lock);


/************************************************
 *	Queueing disciplines manipulation.	*
 ************************************************/


/* The list of all installed queueing disciplines. */

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)
{
	struct Qdisc_ops *q, **qp;
	int rc = -EEXIST;

	write_lock(&qdisc_mod_lock);
	for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next)
		if (!strcmp(qops->id, q->id))
			goto out;

	if (qops->enqueue == NULL)
		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
			goto out_einval;
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	}
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	if (qops->dequeue == NULL)
		qops->dequeue = noop_qdisc_ops.dequeue;

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	if (qops->cl_ops) {
		const struct Qdisc_class_ops *cops = qops->cl_ops;

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		if (!(cops->get && cops->put && 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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	qops->next = NULL;
	*qp = qops;
	rc = 0;
out:
	write_unlock(&qdisc_mod_lock);
	return rc;
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out_einval:
	rc = -EINVAL;
	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)
{
	struct Qdisc_ops *q, **qp;
	int err = -ENOENT;

	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)
			break;
	if (q) {
		*qp = q->next;
		q->next = NULL;
		err = 0;
	}
	write_unlock(&qdisc_mod_lock);
	return err;
}
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EXPORT_SYMBOL(unregister_qdisc);
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/* Get default qdisc if not otherwise specified */
void qdisc_get_default(char *name, size_t len)
{
	read_lock(&qdisc_mod_lock);
	strlcpy(name, default_qdisc_ops->id, len);
	read_unlock(&qdisc_mod_lock);
}

static struct Qdisc_ops *qdisc_lookup_default(const char *name)
{
	struct Qdisc_ops *q = NULL;

	for (q = qdisc_base; q; q = q->next) {
		if (!strcmp(name, q->id)) {
			if (!try_module_get(q->owner))
				q = NULL;
			break;
		}
	}

	return q;
}

/* Set new default qdisc to use */
int qdisc_set_default(const char *name)
{
	const struct Qdisc_ops *ops;

	if (!capable(CAP_NET_ADMIN))
		return -EPERM;

	write_lock(&qdisc_mod_lock);
	ops = qdisc_lookup_default(name);
	if (!ops) {
		/* Not found, drop lock and try to load module */
		write_unlock(&qdisc_mod_lock);
		request_module("sch_%s", name);
		write_lock(&qdisc_mod_lock);

		ops = qdisc_lookup_default(name);
	}

	if (ops) {
		/* Set new default */
		module_put(default_qdisc_ops->owner);
		default_qdisc_ops = ops;
	}
	write_unlock(&qdisc_mod_lock);

	return ops ? 0 : -ENOENT;
}

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#ifdef CONFIG_NET_SCH_DEFAULT
/* Set default value from kernel config */
static int __init sch_default_qdisc(void)
{
	return qdisc_set_default(CONFIG_DEFAULT_NET_SCH);
}
late_initcall(sch_default_qdisc);
#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.)
 * 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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{
	struct Qdisc *q;

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	if (!qdisc_dev(root))
		return (root->handle == handle ? root : NULL);

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	if (!(root->flags & TCQ_F_BUILTIN) &&
	    root->handle == handle)
		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)
			return q;
	}
	return NULL;
}

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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)
			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)) {
		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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	q = qdisc_match_from_root(dev->qdisc, handle);
	if (q)
		goto out;
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	if (dev_ingress_queue(dev))
		q = qdisc_match_from_root(
			dev_ingress_queue(dev)->qdisc_sleeping,
			handle);
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out:
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	return q;
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}

static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
{
	unsigned long cl;
	struct Qdisc *leaf;
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	const struct Qdisc_class_ops *cops = p->ops->cl_ops;
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	if (cops == NULL)
		return NULL;
	cl = cops->get(p, classid);

	if (cl == 0)
		return NULL;
	leaf = cops->leaf(p, cl);
	cops->put(p, cl);
	return leaf;
}

/* Find queueing discipline by name */

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static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind)
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{
	struct Qdisc_ops *q = NULL;

	if (kind) {
		read_lock(&qdisc_mod_lock);
		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))
					q = NULL;
				break;
			}
		}
		read_unlock(&qdisc_mod_lock);
	}
	return q;
}

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/* The linklayer setting were not transferred from iproute2, in older
 * versions, and the rate tables lookup systems have been dropped in
 * the kernel. To keep backward compatible with older iproute2 tc
 * utils, we detect the linklayer setting by detecting if the rate
 * table were modified.
 *
 * For linklayer ATM table entries, the rate table will be aligned to
 * 48 bytes, thus some table entries will contain the same value.  The
 * mpu (min packet unit) is also encoded into the old rate table, thus
 * starting from the mpu, we find low and high table entries for
 * mapping this cell.  If these entries contain the same value, when
 * the rate tables have been modified for linklayer ATM.
 *
 * This is done by rounding mpu to the nearest 48 bytes cell/entry,
 * and then roundup to the next cell, calc the table entry one below,
 * and compare.
 */
static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab)
{
	int low       = roundup(r->mpu, 48);
	int high      = roundup(low+1, 48);
	int cell_low  = low >> r->cell_log;
	int cell_high = (high >> r->cell_log) - 1;

	/* rtab is too inaccurate at rates > 100Mbit/s */
	if ((r->rate > (100000000/8)) || (rtab[0] == 0)) {
		pr_debug("TC linklayer: Giving up ATM detection\n");
		return TC_LINKLAYER_ETHERNET;
	}

	if ((cell_high > cell_low) && (cell_high < 256)
	    && (rtab[cell_low] == rtab[cell_high])) {
		pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n",
			 cell_low, cell_high, rtab[cell_high]);
		return TC_LINKLAYER_ATM;
	}
	return TC_LINKLAYER_ETHERNET;
}

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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,
					struct nlattr *tab)
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{
	struct qdisc_rate_table *rtab;

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	if (tab == NULL || r->rate == 0 || r->cell_log == 0 ||
	    nla_len(tab) != TC_RTAB_SIZE)
		return NULL;

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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)) &&
		    !memcmp(&rtab->data, nla_data(tab), 1024)) {
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			rtab->refcnt++;
			return rtab;
		}
	}

	rtab = kmalloc(sizeof(*rtab), GFP_KERNEL);
	if (rtab) {
		rtab->rate = *r;
		rtab->refcnt = 1;
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		memcpy(rtab->data, nla_data(tab), 1024);
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		if (r->linklayer == TC_LINKLAYER_UNAWARE)
			r->linklayer = __detect_linklayer(r, rtab->data);
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		rtab->next = qdisc_rtab_list;
		qdisc_rtab_list = rtab;
	}
	return rtab;
}
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EXPORT_SYMBOL(qdisc_get_rtab);
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void qdisc_put_rtab(struct qdisc_rate_table *tab)
{
	struct qdisc_rate_table *rtab, **rtabp;

	if (!tab || --tab->refcnt)
		return;

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	for (rtabp = &qdisc_rtab_list;
	     (rtab = *rtabp) != NULL;
	     rtabp = &rtab->next) {
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		if (rtab == tab) {
			*rtabp = rtab->next;
			kfree(rtab);
			return;
		}
	}
}
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EXPORT_SYMBOL(qdisc_put_rtab);
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static LIST_HEAD(qdisc_stab_list);

static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = {
	[TCA_STAB_BASE]	= { .len = sizeof(struct tc_sizespec) },
	[TCA_STAB_DATA] = { .type = NLA_BINARY },
};

static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt)
{
	struct nlattr *tb[TCA_STAB_MAX + 1];
	struct qdisc_size_table *stab;
	struct tc_sizespec *s;
	unsigned int tsize = 0;
	u16 *tab = NULL;
	int err;

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	err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, NULL);
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	if (err < 0)
		return ERR_PTR(err);
	if (!tb[TCA_STAB_BASE])
		return ERR_PTR(-EINVAL);

	s = nla_data(tb[TCA_STAB_BASE]);

	if (s->tsize > 0) {
		if (!tb[TCA_STAB_DATA])
			return ERR_PTR(-EINVAL);
		tab = nla_data(tb[TCA_STAB_DATA]);
		tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16);
	}

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	if (tsize != s->tsize || (!tab && tsize > 0))
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		return ERR_PTR(-EINVAL);

	list_for_each_entry(stab, &qdisc_stab_list, list) {
		if (memcmp(&stab->szopts, s, sizeof(*s)))
			continue;
		if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16)))
			continue;
		stab->refcnt++;
		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;
}

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static void stab_kfree_rcu(struct rcu_head *head)
{
	kfree(container_of(head, struct qdisc_size_table, rcu));
}

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void qdisc_put_stab(struct qdisc_size_table *tab)
{
	if (!tab)
		return;

	if (--tab->refcnt == 0) {
		list_del(&tab->list);
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		call_rcu_bh(&tab->rcu, stab_kfree_rcu);
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	}
}
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(skb, TCA_STAB);
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	if (nest == NULL)
		goto nla_put_failure;
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	if (nla_put(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts))
		goto nla_put_failure;
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	nla_nest_end(skb, nest);

	return skb->len;

nla_put_failure:
	return -1;
}

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void __qdisc_calculate_pkt_len(struct sk_buff *skb,
			       const struct qdisc_size_table *stab)
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{
	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;
}
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EXPORT_SYMBOL(__qdisc_calculate_pkt_len);
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void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc)
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{
	if (!(qdisc->flags & TCQ_F_WARN_NONWC)) {
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		pr_warn("%s: %s qdisc %X: is non-work-conserving?\n",
			txt, qdisc->ops->id, qdisc->handle >> 16);
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		qdisc->flags |= TCQ_F_WARN_NONWC;
	}
}
EXPORT_SYMBOL(qdisc_warn_nonwc);

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static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer)
{
	struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog,
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						 timer);
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	rcu_read_lock();
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	__netif_schedule(qdisc_root(wd->qdisc));
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	rcu_read_unlock();
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	return HRTIMER_NORESTART;
}

void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc)
{
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	hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
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	wd->timer.function = qdisc_watchdog;
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	wd->qdisc = qdisc;
}
EXPORT_SYMBOL(qdisc_watchdog_init);

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void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires)
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{
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	if (test_bit(__QDISC_STATE_DEACTIVATED,
		     &qdisc_root_sleeping(wd->qdisc)->state))
		return;

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	if (wd->last_expires == expires)
		return;

	wd->last_expires = expires;
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	hrtimer_start(&wd->timer,
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		      ns_to_ktime(expires),
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		      HRTIMER_MODE_ABS_PINNED);
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}
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EXPORT_SYMBOL(qdisc_watchdog_schedule_ns);
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void qdisc_watchdog_cancel(struct qdisc_watchdog *wd)
{
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	hrtimer_cancel(&wd->timer);
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}
EXPORT_SYMBOL(qdisc_watchdog_cancel);
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static struct hlist_head *qdisc_class_hash_alloc(unsigned int n)
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{
	unsigned int size = n * sizeof(struct hlist_head), i;
	struct hlist_head *h;

	if (size <= PAGE_SIZE)
		h = kmalloc(size, GFP_KERNEL);
	else
		h = (struct hlist_head *)
			__get_free_pages(GFP_KERNEL, get_order(size));

	if (h != NULL) {
		for (i = 0; i < n; i++)
			INIT_HLIST_HEAD(&h[i]);
	}
	return h;
}

static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n)
{
	unsigned int size = n * sizeof(struct hlist_head);

	if (size <= PAGE_SIZE)
		kfree(h);
	else
		free_pages((unsigned long)h, get_order(size));
}

void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash)
{
	struct Qdisc_class_common *cl;
653
	struct hlist_node *next;
654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671
	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++) {
672
		hlist_for_each_entry_safe(cl, next, &ohash[i], hnode) {
673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725
			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);

	qdisc_class_hash_free(ohash, osize);
}
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 == NULL)
		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)
{
	qdisc_class_hash_free(clhash->hash, clhash->hashsize);
}
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);

726 727 728
/* Allocate an unique handle from space managed by kernel
 * Possible range is [8000-FFFF]:0000 (0x8000 values)
 */
L
Linus Torvalds 已提交
729 730
static u32 qdisc_alloc_handle(struct net_device *dev)
{
731
	int i = 0x8000;
L
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732 733 734 735 736 737
	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);
738 739 740 741
		if (!qdisc_lookup(dev, autohandle))
			return autohandle;
		cond_resched();
	} while	(--i > 0);
L
Linus Torvalds 已提交
742

743
	return 0;
L
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744 745
}

746 747
void qdisc_tree_reduce_backlog(struct Qdisc *sch, unsigned int n,
			       unsigned int len)
748
{
749
	const struct Qdisc_class_ops *cops;
750 751
	unsigned long cl;
	u32 parentid;
752
	int drops;
753

754
	if (n == 0 && len == 0)
755
		return;
756
	drops = max_t(int, n, 0);
757
	rcu_read_lock();
758
	while ((parentid = sch->parent)) {
759
		if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS))
760
			break;
761

762 763 764
		if (sch->flags & TCQ_F_NOPARENT)
			break;
		/* TODO: perform the search on a per txq basis */
765
		sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid));
766
		if (sch == NULL) {
767 768
			WARN_ON_ONCE(parentid != TC_H_ROOT);
			break;
769
		}
770 771 772 773 774 775 776
		cops = sch->ops->cl_ops;
		if (cops->qlen_notify) {
			cl = cops->get(sch, parentid);
			cops->qlen_notify(sch, cl);
			cops->put(sch, cl);
		}
		sch->q.qlen -= n;
777
		sch->qstats.backlog -= len;
778
		__qdisc_qstats_drop(sch, drops);
779
	}
780
	rcu_read_unlock();
781
}
782
EXPORT_SYMBOL(qdisc_tree_reduce_backlog);
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Linus Torvalds 已提交
783

784 785
static void notify_and_destroy(struct net *net, struct sk_buff *skb,
			       struct nlmsghdr *n, u32 clid,
786 787 788
			       struct Qdisc *old, struct Qdisc *new)
{
	if (new || old)
789
		qdisc_notify(net, skb, n, clid, old, new);
L
Linus Torvalds 已提交
790

791
	if (old)
792 793 794 795 796 797 798 799 800 801
		qdisc_destroy(old);
}

/* 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.
L
Linus Torvalds 已提交
802 803 804
 */

static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
805 806
		       struct sk_buff *skb, struct nlmsghdr *n, u32 classid,
		       struct Qdisc *new, struct Qdisc *old)
L
Linus Torvalds 已提交
807
{
808
	struct Qdisc *q = old;
809
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
810 811
	int err = 0;

812
	if (parent == NULL) {
813 814 815 816
		unsigned int i, num_q, ingress;

		ingress = 0;
		num_q = dev->num_tx_queues;
817 818
		if ((q && q->flags & TCQ_F_INGRESS) ||
		    (new && new->flags & TCQ_F_INGRESS)) {
819 820
			num_q = 1;
			ingress = 1;
821 822
			if (!dev_ingress_queue(dev))
				return -ENOENT;
823 824 825 826 827
		}

		if (dev->flags & IFF_UP)
			dev_deactivate(dev);

828 829
		if (new && new->ops->attach)
			goto skip;
830

831
		for (i = 0; i < num_q; i++) {
832
			struct netdev_queue *dev_queue = dev_ingress_queue(dev);
833 834 835 836

			if (!ingress)
				dev_queue = netdev_get_tx_queue(dev, i);

837 838
			old = dev_graft_qdisc(dev_queue, new);
			if (new && i > 0)
839
				refcount_inc(&new->refcnt);
840

841 842
			if (!ingress)
				qdisc_destroy(old);
L
Linus Torvalds 已提交
843
		}
844

845
skip:
846
		if (!ingress) {
847 848
			notify_and_destroy(net, skb, n, classid,
					   dev->qdisc, new);
849
			if (new && !new->ops->attach)
850
				refcount_inc(&new->refcnt);
851
			dev->qdisc = new ? : &noop_qdisc;
852 853 854

			if (new && new->ops->attach)
				new->ops->attach(new);
855
		} else {
856
			notify_and_destroy(net, skb, n, classid, old, new);
857
		}
858

859 860
		if (dev->flags & IFF_UP)
			dev_activate(dev);
L
Linus Torvalds 已提交
861
	} else {
862
		const struct Qdisc_class_ops *cops = parent->ops->cl_ops;
L
Linus Torvalds 已提交
863

864 865
		err = -EOPNOTSUPP;
		if (cops && cops->graft) {
L
Linus Torvalds 已提交
866 867
			unsigned long cl = cops->get(parent, classid);
			if (cl) {
868
				err = cops->graft(parent, cl, new, &old);
L
Linus Torvalds 已提交
869
				cops->put(parent, cl);
870 871
			} else
				err = -ENOENT;
L
Linus Torvalds 已提交
872
		}
873
		if (!err)
874
			notify_and_destroy(net, skb, n, classid, old, new);
L
Linus Torvalds 已提交
875 876 877 878
	}
	return err;
}

879 880 881 882
/* lockdep annotation is needed for ingress; egress gets it only for name */
static struct lock_class_key qdisc_tx_lock;
static struct lock_class_key qdisc_rx_lock;

L
Linus Torvalds 已提交
883 884 885 886 887 888
/*
   Allocate and initialize new qdisc.

   Parameters are passed via opt.
 */

889 890 891 892
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)
L
Linus Torvalds 已提交
893 894
{
	int err;
895
	struct nlattr *kind = tca[TCA_KIND];
L
Linus Torvalds 已提交
896 897
	struct Qdisc *sch;
	struct Qdisc_ops *ops;
898
	struct qdisc_size_table *stab;
L
Linus Torvalds 已提交
899 900

	ops = qdisc_lookup_ops(kind);
901
#ifdef CONFIG_MODULES
L
Linus Torvalds 已提交
902 903
	if (ops == NULL && kind != NULL) {
		char name[IFNAMSIZ];
904
		if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) {
L
Linus Torvalds 已提交
905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
			/* 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

929
	err = -ENOENT;
L
Linus Torvalds 已提交
930 931 932
	if (ops == NULL)
		goto err_out;

933
	sch = qdisc_alloc(dev_queue, ops);
934 935
	if (IS_ERR(sch)) {
		err = PTR_ERR(sch);
L
Linus Torvalds 已提交
936
		goto err_out2;
937
	}
L
Linus Torvalds 已提交
938

939 940
	sch->parent = parent;

941
	if (handle == TC_H_INGRESS) {
L
Linus Torvalds 已提交
942
		sch->flags |= TCQ_F_INGRESS;
943
		handle = TC_H_MAKE(TC_H_INGRESS, 0);
944
		lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock);
945 946 947 948 949 950 951
	} else {
		if (handle == 0) {
			handle = qdisc_alloc_handle(dev);
			err = -ENOMEM;
			if (handle == 0)
				goto err_out3;
		}
952
		lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock);
953
		if (!netif_is_multiqueue(dev))
954
			sch->flags |= TCQ_F_ONETXQUEUE;
L
Linus Torvalds 已提交
955 956
	}

957
	sch->handle = handle;
L
Linus Torvalds 已提交
958

959 960 961 962 963 964 965 966 967 968 969
	/* 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");
	}

970
	if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) {
971 972
		if (qdisc_is_percpu_stats(sch)) {
			sch->cpu_bstats =
973
				netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu);
974 975
			if (!sch->cpu_bstats)
				goto err_out4;
976 977 978 979

			sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue);
			if (!sch->cpu_qstats)
				goto err_out4;
980 981
		}

982 983 984 985
		if (tca[TCA_STAB]) {
			stab = qdisc_get_stab(tca[TCA_STAB]);
			if (IS_ERR(stab)) {
				err = PTR_ERR(stab);
986
				goto err_out4;
987
			}
988
			rcu_assign_pointer(sch->stab, stab);
989
		}
990
		if (tca[TCA_RATE]) {
991
			seqcount_t *running;
992

993 994 995 996
			err = -EOPNOTSUPP;
			if (sch->flags & TCQ_F_MQROOT)
				goto err_out4;

997
			if ((sch->parent != TC_H_ROOT) &&
998 999
			    !(sch->flags & TCQ_F_INGRESS) &&
			    (!p || !(p->flags & TCQ_F_MQROOT)))
1000
				running = qdisc_root_sleeping_running(sch);
1001
			else
1002
				running = &sch->running;
1003

1004 1005 1006
			err = gen_new_estimator(&sch->bstats,
						sch->cpu_bstats,
						&sch->rate_est,
1007 1008
						NULL,
						running,
1009
						tca[TCA_RATE]);
1010 1011
			if (err)
				goto err_out4;
1012
		}
1013

1014
		qdisc_hash_add(sch, false);
L
Linus Torvalds 已提交
1015 1016 1017

		return sch;
	}
1018
	/* ops->init() failed, we call ->destroy() like qdisc_create_dflt() */
1019 1020
	if (ops->destroy)
		ops->destroy(sch);
L
Linus Torvalds 已提交
1021 1022
err_out3:
	dev_put(dev);
1023
	kfree((char *) sch - sch->padded);
L
Linus Torvalds 已提交
1024 1025 1026 1027 1028
err_out2:
	module_put(ops->owner);
err_out:
	*errp = err;
	return NULL;
1029 1030

err_out4:
1031
	free_percpu(sch->cpu_bstats);
1032
	free_percpu(sch->cpu_qstats);
1033 1034 1035 1036
	/*
	 * Any broken qdiscs that would require a ops->reset() here?
	 * The qdisc was never in action so it shouldn't be necessary.
	 */
1037
	qdisc_put_stab(rtnl_dereference(sch->stab));
1038 1039 1040
	if (ops->destroy)
		ops->destroy(sch);
	goto err_out3;
L
Linus Torvalds 已提交
1041 1042
}

1043
static int qdisc_change(struct Qdisc *sch, struct nlattr **tca)
L
Linus Torvalds 已提交
1044
{
1045
	struct qdisc_size_table *ostab, *stab = NULL;
1046
	int err = 0;
L
Linus Torvalds 已提交
1047

1048
	if (tca[TCA_OPTIONS]) {
L
Linus Torvalds 已提交
1049 1050
		if (sch->ops->change == NULL)
			return -EINVAL;
1051
		err = sch->ops->change(sch, tca[TCA_OPTIONS]);
L
Linus Torvalds 已提交
1052 1053 1054
		if (err)
			return err;
	}
1055 1056 1057 1058 1059 1060 1061

	if (tca[TCA_STAB]) {
		stab = qdisc_get_stab(tca[TCA_STAB]);
		if (IS_ERR(stab))
			return PTR_ERR(stab);
	}

1062 1063 1064
	ostab = rtnl_dereference(sch->stab);
	rcu_assign_pointer(sch->stab, stab);
	qdisc_put_stab(ostab);
1065

1066
	if (tca[TCA_RATE]) {
1067 1068
		/* NB: ignores errors from replace_estimator
		   because change can't be undone. */
1069 1070
		if (sch->flags & TCQ_F_MQROOT)
			goto out;
1071 1072 1073
		gen_replace_estimator(&sch->bstats,
				      sch->cpu_bstats,
				      &sch->rate_est,
1074 1075
				      NULL,
				      qdisc_root_sleeping_running(sch),
1076
				      tca[TCA_RATE]);
1077 1078
	}
out:
L
Linus Torvalds 已提交
1079 1080 1081
	return 0;
}

E
Eric Dumazet 已提交
1082 1083
struct check_loop_arg {
	struct qdisc_walker	w;
L
Linus Torvalds 已提交
1084 1085 1086 1087
	struct Qdisc		*p;
	int			depth;
};

1088 1089
static int check_loop_fn(struct Qdisc *q, unsigned long cl,
			 struct qdisc_walker *w);
L
Linus Torvalds 已提交
1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109

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;
1110
	const struct Qdisc_class_ops *cops = q->ops->cl_ops;
L
Linus Torvalds 已提交
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
	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;
}

/*
 * Delete/get qdisc.
 */

1126 1127
static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
			struct netlink_ext_ack *extack)
L
Linus Torvalds 已提交
1128
{
1129
	struct net *net = sock_net(skb->sk);
1130
	struct tcmsg *tcm = nlmsg_data(n);
1131
	struct nlattr *tca[TCA_MAX + 1];
L
Linus Torvalds 已提交
1132
	struct net_device *dev;
1133
	u32 clid;
L
Linus Torvalds 已提交
1134 1135 1136 1137
	struct Qdisc *q = NULL;
	struct Qdisc *p = NULL;
	int err;

1138
	if ((n->nlmsg_type != RTM_GETQDISC) &&
1139
	    !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1140 1141
		return -EPERM;

1142
	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
1143 1144 1145
	if (err < 0)
		return err;

1146 1147 1148 1149 1150
	dev = __dev_get_by_index(net, tcm->tcm_ifindex);
	if (!dev)
		return -ENODEV;

	clid = tcm->tcm_parent;
L
Linus Torvalds 已提交
1151 1152 1153
	if (clid) {
		if (clid != TC_H_ROOT) {
			if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
E
Eric Dumazet 已提交
1154 1155
				p = qdisc_lookup(dev, TC_H_MAJ(clid));
				if (!p)
L
Linus Torvalds 已提交
1156 1157
					return -ENOENT;
				q = qdisc_leaf(p, clid);
E
Eric Dumazet 已提交
1158 1159
			} else if (dev_ingress_queue(dev)) {
				q = dev_ingress_queue(dev)->qdisc_sleeping;
1160
			}
L
Linus Torvalds 已提交
1161
		} else {
1162
			q = dev->qdisc;
L
Linus Torvalds 已提交
1163 1164 1165 1166 1167 1168 1169
		}
		if (!q)
			return -ENOENT;

		if (tcm->tcm_handle && q->handle != tcm->tcm_handle)
			return -EINVAL;
	} else {
E
Eric Dumazet 已提交
1170 1171
		q = qdisc_lookup(dev, tcm->tcm_handle);
		if (!q)
L
Linus Torvalds 已提交
1172 1173 1174
			return -ENOENT;
	}

1175
	if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
L
Linus Torvalds 已提交
1176 1177 1178 1179 1180 1181 1182
		return -EINVAL;

	if (n->nlmsg_type == RTM_DELQDISC) {
		if (!clid)
			return -EINVAL;
		if (q->handle == 0)
			return -ENOENT;
E
Eric Dumazet 已提交
1183 1184
		err = qdisc_graft(dev, p, skb, n, clid, NULL, q);
		if (err != 0)
L
Linus Torvalds 已提交
1185 1186
			return err;
	} else {
1187
		qdisc_notify(net, skb, n, clid, NULL, q);
L
Linus Torvalds 已提交
1188 1189 1190 1191 1192
	}
	return 0;
}

/*
E
Eric Dumazet 已提交
1193
 * Create/change qdisc.
L
Linus Torvalds 已提交
1194 1195
 */

1196 1197
static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
			   struct netlink_ext_ack *extack)
L
Linus Torvalds 已提交
1198
{
1199
	struct net *net = sock_net(skb->sk);
L
Linus Torvalds 已提交
1200
	struct tcmsg *tcm;
1201
	struct nlattr *tca[TCA_MAX + 1];
L
Linus Torvalds 已提交
1202 1203 1204 1205 1206
	struct net_device *dev;
	u32 clid;
	struct Qdisc *q, *p;
	int err;

1207
	if (!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1208 1209
		return -EPERM;

L
Linus Torvalds 已提交
1210 1211
replay:
	/* Reinit, just in case something touches this. */
1212
	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
1213 1214 1215
	if (err < 0)
		return err;

1216
	tcm = nlmsg_data(n);
L
Linus Torvalds 已提交
1217 1218 1219
	clid = tcm->tcm_parent;
	q = p = NULL;

E
Eric Dumazet 已提交
1220 1221
	dev = __dev_get_by_index(net, tcm->tcm_ifindex);
	if (!dev)
L
Linus Torvalds 已提交
1222 1223
		return -ENODEV;

1224

L
Linus Torvalds 已提交
1225 1226 1227
	if (clid) {
		if (clid != TC_H_ROOT) {
			if (clid != TC_H_INGRESS) {
E
Eric Dumazet 已提交
1228 1229
				p = qdisc_lookup(dev, TC_H_MAJ(clid));
				if (!p)
L
Linus Torvalds 已提交
1230 1231
					return -ENOENT;
				q = qdisc_leaf(p, clid);
E
Eric Dumazet 已提交
1232 1233
			} else if (dev_ingress_queue_create(dev)) {
				q = dev_ingress_queue(dev)->qdisc_sleeping;
L
Linus Torvalds 已提交
1234 1235
			}
		} else {
1236
			q = dev->qdisc;
L
Linus Torvalds 已提交
1237 1238 1239 1240 1241 1242 1243 1244
		}

		/* 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) {
E
Eric Dumazet 已提交
1245
				if (q && !(n->nlmsg_flags & NLM_F_REPLACE))
L
Linus Torvalds 已提交
1246 1247 1248
					return -EEXIST;
				if (TC_H_MIN(tcm->tcm_handle))
					return -EINVAL;
E
Eric Dumazet 已提交
1249 1250
				q = qdisc_lookup(dev, tcm->tcm_handle);
				if (!q)
L
Linus Torvalds 已提交
1251
					goto create_n_graft;
E
Eric Dumazet 已提交
1252
				if (n->nlmsg_flags & NLM_F_EXCL)
L
Linus Torvalds 已提交
1253
					return -EEXIST;
1254
				if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
L
Linus Torvalds 已提交
1255 1256 1257 1258
					return -EINVAL;
				if (q == p ||
				    (p && check_loop(q, p, 0)))
					return -ELOOP;
1259
				refcount_inc(&q->refcnt);
L
Linus Torvalds 已提交
1260 1261
				goto graft;
			} else {
E
Eric Dumazet 已提交
1262
				if (!q)
L
Linus Torvalds 已提交
1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
					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.
				 */
E
Eric Dumazet 已提交
1284 1285 1286
				if ((n->nlmsg_flags & NLM_F_CREATE) &&
				    (n->nlmsg_flags & NLM_F_REPLACE) &&
				    ((n->nlmsg_flags & NLM_F_EXCL) ||
1287 1288
				     (tca[TCA_KIND] &&
				      nla_strcmp(tca[TCA_KIND], q->ops->id))))
L
Linus Torvalds 已提交
1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
					goto create_n_graft;
			}
		}
	} else {
		if (!tcm->tcm_handle)
			return -EINVAL;
		q = qdisc_lookup(dev, tcm->tcm_handle);
	}

	/* Change qdisc parameters */
	if (q == NULL)
		return -ENOENT;
E
Eric Dumazet 已提交
1301
	if (n->nlmsg_flags & NLM_F_EXCL)
L
Linus Torvalds 已提交
1302
		return -EEXIST;
1303
	if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id))
L
Linus Torvalds 已提交
1304 1305 1306
		return -EINVAL;
	err = qdisc_change(q, tca);
	if (err == 0)
1307
		qdisc_notify(net, skb, n, clid, NULL, q);
L
Linus Torvalds 已提交
1308 1309 1310
	return err;

create_n_graft:
E
Eric Dumazet 已提交
1311
	if (!(n->nlmsg_flags & NLM_F_CREATE))
L
Linus Torvalds 已提交
1312
		return -ENOENT;
1313 1314 1315 1316 1317 1318 1319 1320
	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);
		else
			err = -ENOENT;
	} else {
1321
		struct netdev_queue *dev_queue;
1322 1323

		if (p && p->ops->cl_ops && p->ops->cl_ops->select_queue)
1324 1325 1326 1327 1328
			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);
1329

1330
		q = qdisc_create(dev, dev_queue, p,
1331
				 tcm->tcm_parent, tcm->tcm_handle,
1332
				 tca, &err);
1333
	}
L
Linus Torvalds 已提交
1334 1335 1336 1337 1338 1339 1340
	if (q == NULL) {
		if (err == -EAGAIN)
			goto replay;
		return err;
	}

graft:
1341 1342 1343 1344 1345
	err = qdisc_graft(dev, p, skb, n, clid, q, NULL);
	if (err) {
		if (q)
			qdisc_destroy(q);
		return err;
L
Linus Torvalds 已提交
1346
	}
1347

L
Linus Torvalds 已提交
1348 1349 1350 1351
	return 0;
}

static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid,
1352
			 u32 portid, u32 seq, u16 flags, int event)
L
Linus Torvalds 已提交
1353
{
1354
	struct gnet_stats_basic_cpu __percpu *cpu_bstats = NULL;
1355
	struct gnet_stats_queue __percpu *cpu_qstats = NULL;
L
Linus Torvalds 已提交
1356 1357
	struct tcmsg *tcm;
	struct nlmsghdr  *nlh;
1358
	unsigned char *b = skb_tail_pointer(skb);
L
Linus Torvalds 已提交
1359
	struct gnet_dump d;
1360
	struct qdisc_size_table *stab;
1361
	__u32 qlen;
L
Linus Torvalds 已提交
1362

1363
	cond_resched();
1364
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1365 1366 1367
	if (!nlh)
		goto out_nlmsg_trim;
	tcm = nlmsg_data(nlh);
L
Linus Torvalds 已提交
1368
	tcm->tcm_family = AF_UNSPEC;
1369 1370
	tcm->tcm__pad1 = 0;
	tcm->tcm__pad2 = 0;
1371
	tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
L
Linus Torvalds 已提交
1372 1373
	tcm->tcm_parent = clid;
	tcm->tcm_handle = q->handle;
1374
	tcm->tcm_info = refcount_read(&q->refcnt);
1375 1376
	if (nla_put_string(skb, TCA_KIND, q->ops->id))
		goto nla_put_failure;
L
Linus Torvalds 已提交
1377
	if (q->ops->dump && q->ops->dump(q, skb) < 0)
1378
		goto nla_put_failure;
1379
	qlen = q->q.qlen;
L
Linus Torvalds 已提交
1380

1381 1382
	stab = rtnl_dereference(q->stab);
	if (stab && qdisc_dump_stab(skb, stab) < 0)
1383 1384
		goto nla_put_failure;

1385
	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1386
					 NULL, &d, TCA_PAD) < 0)
1387
		goto nla_put_failure;
L
Linus Torvalds 已提交
1388 1389

	if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0)
1390
		goto nla_put_failure;
L
Linus Torvalds 已提交
1391

1392
	if (qdisc_is_percpu_stats(q)) {
1393
		cpu_bstats = q->cpu_bstats;
1394 1395
		cpu_qstats = q->cpu_qstats;
	}
1396

1397 1398
	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(q),
				  &d, cpu_bstats, &q->bstats) < 0 ||
1399
	    gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 ||
1400
	    gnet_stats_copy_queue(&d, cpu_qstats, &q->qstats, qlen) < 0)
1401
		goto nla_put_failure;
1402

L
Linus Torvalds 已提交
1403
	if (gnet_stats_finish_copy(&d) < 0)
1404
		goto nla_put_failure;
1405

1406
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
L
Linus Torvalds 已提交
1407 1408
	return skb->len;

1409
out_nlmsg_trim:
1410
nla_put_failure:
1411
	nlmsg_trim(skb, b);
L
Linus Torvalds 已提交
1412 1413 1414
	return -1;
}

1415
static bool tc_qdisc_dump_ignore(struct Qdisc *q, bool dump_invisible)
1416
{
1417 1418 1419 1420 1421 1422
	if (q->flags & TCQ_F_BUILTIN)
		return true;
	if ((q->flags & TCQ_F_INVISIBLE) && !dump_invisible)
		return true;

	return false;
1423 1424
}

1425 1426 1427
static int qdisc_notify(struct net *net, struct sk_buff *oskb,
			struct nlmsghdr *n, u32 clid,
			struct Qdisc *old, struct Qdisc *new)
L
Linus Torvalds 已提交
1428 1429
{
	struct sk_buff *skb;
1430
	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
L
Linus Torvalds 已提交
1431 1432 1433 1434 1435

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb)
		return -ENOBUFS;

1436
	if (old && !tc_qdisc_dump_ignore(old, false)) {
1437
		if (tc_fill_qdisc(skb, old, clid, portid, n->nlmsg_seq,
E
Eric Dumazet 已提交
1438
				  0, RTM_DELQDISC) < 0)
L
Linus Torvalds 已提交
1439 1440
			goto err_out;
	}
1441
	if (new && !tc_qdisc_dump_ignore(new, false)) {
1442
		if (tc_fill_qdisc(skb, new, clid, portid, n->nlmsg_seq,
E
Eric Dumazet 已提交
1443
				  old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0)
L
Linus Torvalds 已提交
1444 1445 1446 1447
			goto err_out;
	}

	if (skb->len)
1448
		return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
E
Eric Dumazet 已提交
1449
				      n->nlmsg_flags & NLM_F_ECHO);
L
Linus Torvalds 已提交
1450 1451 1452 1453 1454 1455

err_out:
	kfree_skb(skb);
	return -EINVAL;
}

1456 1457
static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb,
			      struct netlink_callback *cb,
1458 1459
			      int *q_idx_p, int s_q_idx, bool recur,
			      bool dump_invisible)
1460 1461 1462
{
	int ret = 0, q_idx = *q_idx_p;
	struct Qdisc *q;
1463
	int b;
1464 1465 1466 1467 1468 1469 1470 1471

	if (!root)
		return 0;

	q = root;
	if (q_idx < s_q_idx) {
		q_idx++;
	} else {
1472
		if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1473
		    tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1474 1475
				  cb->nlh->nlmsg_seq, NLM_F_MULTI,
				  RTM_NEWQDISC) <= 0)
1476 1477 1478
			goto done;
		q_idx++;
	}
1479

1480 1481 1482 1483 1484 1485 1486
	/* 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)
1487 1488
		goto out;

1489
	hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
1490 1491 1492 1493
		if (q_idx < s_q_idx) {
			q_idx++;
			continue;
		}
1494
		if (!tc_qdisc_dump_ignore(q, dump_invisible) &&
1495
		    tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).portid,
1496 1497
				  cb->nlh->nlmsg_seq, NLM_F_MULTI,
				  RTM_NEWQDISC) <= 0)
1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509
			goto done;
		q_idx++;
	}

out:
	*q_idx_p = q_idx;
	return ret;
done:
	ret = -1;
	goto out;
}

L
Linus Torvalds 已提交
1510 1511
static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
{
1512
	struct net *net = sock_net(skb->sk);
L
Linus Torvalds 已提交
1513 1514 1515
	int idx, q_idx;
	int s_idx, s_q_idx;
	struct net_device *dev;
1516 1517 1518 1519
	const struct nlmsghdr *nlh = cb->nlh;
	struct tcmsg *tcm = nlmsg_data(nlh);
	struct nlattr *tca[TCA_MAX + 1];
	int err;
L
Linus Torvalds 已提交
1520 1521 1522

	s_idx = cb->args[0];
	s_q_idx = q_idx = cb->args[1];
1523

1524
	idx = 0;
1525
	ASSERT_RTNL();
1526

1527
	err = nlmsg_parse(nlh, sizeof(*tcm), tca, TCA_MAX, NULL, NULL);
1528 1529 1530
	if (err < 0)
		return err;

1531
	for_each_netdev(net, dev) {
1532 1533
		struct netdev_queue *dev_queue;

L
Linus Torvalds 已提交
1534
		if (idx < s_idx)
1535
			goto cont;
L
Linus Torvalds 已提交
1536 1537 1538
		if (idx > s_idx)
			s_q_idx = 0;
		q_idx = 0;
1539

1540
		if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx,
1541
				       true, tca[TCA_DUMP_INVISIBLE]) < 0)
1542 1543
			goto done;

1544 1545 1546
		dev_queue = dev_ingress_queue(dev);
		if (dev_queue &&
		    tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb,
1547 1548
				       &q_idx, s_q_idx, false,
				       tca[TCA_DUMP_INVISIBLE]) < 0)
1549 1550
			goto done;

1551 1552
cont:
		idx++;
L
Linus Torvalds 已提交
1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
	}

done:
	cb->args[0] = idx;
	cb->args[1] = q_idx;

	return skb->len;
}



/************************************************
 *	Traffic classes manipulation.		*
 ************************************************/



1570 1571
static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
			 struct netlink_ext_ack *extack)
L
Linus Torvalds 已提交
1572
{
1573
	struct net *net = sock_net(skb->sk);
1574
	struct tcmsg *tcm = nlmsg_data(n);
1575
	struct nlattr *tca[TCA_MAX + 1];
L
Linus Torvalds 已提交
1576 1577
	struct net_device *dev;
	struct Qdisc *q = NULL;
1578
	const struct Qdisc_class_ops *cops;
L
Linus Torvalds 已提交
1579 1580
	unsigned long cl = 0;
	unsigned long new_cl;
1581 1582 1583
	u32 portid;
	u32 clid;
	u32 qid;
L
Linus Torvalds 已提交
1584 1585
	int err;

1586
	if ((n->nlmsg_type != RTM_GETTCLASS) &&
1587
	    !netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
1588 1589
		return -EPERM;

1590
	err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL, extack);
1591 1592 1593
	if (err < 0)
		return err;

1594 1595 1596 1597
	dev = __dev_get_by_index(net, tcm->tcm_ifindex);
	if (!dev)
		return -ENODEV;

L
Linus Torvalds 已提交
1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612
	/*
	   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 */

1613 1614 1615 1616
	portid = tcm->tcm_parent;
	clid = tcm->tcm_handle;
	qid = TC_H_MAJ(clid);

1617 1618
	if (portid != TC_H_ROOT) {
		u32 qid1 = TC_H_MAJ(portid);
L
Linus Torvalds 已提交
1619 1620 1621 1622 1623 1624 1625 1626

		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)
1627
			qid = dev->qdisc->handle;
L
Linus Torvalds 已提交
1628 1629

		/* Now qid is genuine qdisc handle consistent
E
Eric Dumazet 已提交
1630 1631
		 * both with parent and child.
		 *
1632
		 * TC_H_MAJ(portid) still may be unspecified, complete it now.
L
Linus Torvalds 已提交
1633
		 */
1634 1635
		if (portid)
			portid = TC_H_MAKE(qid, portid);
L
Linus Torvalds 已提交
1636 1637
	} else {
		if (qid == 0)
1638
			qid = dev->qdisc->handle;
L
Linus Torvalds 已提交
1639 1640 1641
	}

	/* OK. Locate qdisc */
E
Eric Dumazet 已提交
1642 1643
	q = qdisc_lookup(dev, qid);
	if (!q)
L
Linus Torvalds 已提交
1644 1645 1646 1647 1648 1649 1650 1651 1652
		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) {
1653
		if (portid == TC_H_ROOT)
L
Linus Torvalds 已提交
1654 1655 1656 1657 1658 1659 1660 1661 1662
			clid = qid;
	} else
		clid = TC_H_MAKE(qid, clid);

	if (clid)
		cl = cops->get(q, clid);

	if (cl == 0) {
		err = -ENOENT;
E
Eric Dumazet 已提交
1663 1664
		if (n->nlmsg_type != RTM_NEWTCLASS ||
		    !(n->nlmsg_flags & NLM_F_CREATE))
L
Linus Torvalds 已提交
1665 1666 1667
			goto out;
	} else {
		switch (n->nlmsg_type) {
1668
		case RTM_NEWTCLASS:
L
Linus Torvalds 已提交
1669
			err = -EEXIST;
E
Eric Dumazet 已提交
1670
			if (n->nlmsg_flags & NLM_F_EXCL)
L
Linus Torvalds 已提交
1671 1672 1673
				goto out;
			break;
		case RTM_DELTCLASS:
1674 1675 1676
			err = -EOPNOTSUPP;
			if (cops->delete)
				err = cops->delete(q, cl);
L
Linus Torvalds 已提交
1677
			if (err == 0)
1678 1679
				tclass_notify(net, skb, n, q, cl,
					      RTM_DELTCLASS);
L
Linus Torvalds 已提交
1680 1681
			goto out;
		case RTM_GETTCLASS:
1682
			err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS);
L
Linus Torvalds 已提交
1683 1684 1685 1686 1687 1688 1689 1690
			goto out;
		default:
			err = -EINVAL;
			goto out;
		}
	}

	new_cl = cl;
1691 1692
	err = -EOPNOTSUPP;
	if (cops->change)
1693
		err = cops->change(q, clid, portid, tca, &new_cl);
L
Linus Torvalds 已提交
1694
	if (err == 0)
1695
		tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS);
L
Linus Torvalds 已提交
1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706

out:
	if (cl)
		cops->put(q, cl);

	return err;
}


static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q,
			  unsigned long cl,
1707
			  u32 portid, u32 seq, u16 flags, int event)
L
Linus Torvalds 已提交
1708 1709 1710
{
	struct tcmsg *tcm;
	struct nlmsghdr  *nlh;
1711
	unsigned char *b = skb_tail_pointer(skb);
L
Linus Torvalds 已提交
1712
	struct gnet_dump d;
1713
	const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops;
L
Linus Torvalds 已提交
1714

1715
	cond_resched();
1716
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
1717 1718 1719
	if (!nlh)
		goto out_nlmsg_trim;
	tcm = nlmsg_data(nlh);
L
Linus Torvalds 已提交
1720
	tcm->tcm_family = AF_UNSPEC;
1721 1722
	tcm->tcm__pad1 = 0;
	tcm->tcm__pad2 = 0;
1723
	tcm->tcm_ifindex = qdisc_dev(q)->ifindex;
L
Linus Torvalds 已提交
1724 1725 1726
	tcm->tcm_parent = q->handle;
	tcm->tcm_handle = q->handle;
	tcm->tcm_info = 0;
1727 1728
	if (nla_put_string(skb, TCA_KIND, q->ops->id))
		goto nla_put_failure;
L
Linus Torvalds 已提交
1729
	if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0)
1730
		goto nla_put_failure;
L
Linus Torvalds 已提交
1731

1732
	if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, TCA_XSTATS,
1733
					 NULL, &d, TCA_PAD) < 0)
1734
		goto nla_put_failure;
L
Linus Torvalds 已提交
1735 1736

	if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0)
1737
		goto nla_put_failure;
L
Linus Torvalds 已提交
1738 1739

	if (gnet_stats_finish_copy(&d) < 0)
1740
		goto nla_put_failure;
L
Linus Torvalds 已提交
1741

1742
	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
L
Linus Torvalds 已提交
1743 1744
	return skb->len;

1745
out_nlmsg_trim:
1746
nla_put_failure:
1747
	nlmsg_trim(skb, b);
L
Linus Torvalds 已提交
1748 1749 1750
	return -1;
}

1751 1752 1753
static int tclass_notify(struct net *net, struct sk_buff *oskb,
			 struct nlmsghdr *n, struct Qdisc *q,
			 unsigned long cl, int event)
L
Linus Torvalds 已提交
1754 1755
{
	struct sk_buff *skb;
1756
	u32 portid = oskb ? NETLINK_CB(oskb).portid : 0;
L
Linus Torvalds 已提交
1757 1758 1759 1760 1761

	skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb)
		return -ENOBUFS;

1762
	if (tc_fill_tclass(skb, q, cl, portid, n->nlmsg_seq, 0, event) < 0) {
L
Linus Torvalds 已提交
1763 1764 1765 1766
		kfree_skb(skb);
		return -EINVAL;
	}

1767
	return rtnetlink_send(skb, net, portid, RTNLGRP_TC,
E
Eric Dumazet 已提交
1768
			      n->nlmsg_flags & NLM_F_ECHO);
L
Linus Torvalds 已提交
1769 1770
}

E
Eric Dumazet 已提交
1771 1772 1773 1774
struct qdisc_dump_args {
	struct qdisc_walker	w;
	struct sk_buff		*skb;
	struct netlink_callback	*cb;
L
Linus Torvalds 已提交
1775 1776
};

1777 1778
static int qdisc_class_dump(struct Qdisc *q, unsigned long cl,
			    struct qdisc_walker *arg)
L
Linus Torvalds 已提交
1779 1780 1781
{
	struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg;

1782
	return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).portid,
1783 1784
			      a->cb->nlh->nlmsg_seq, NLM_F_MULTI,
			      RTM_NEWTCLASS);
L
Linus Torvalds 已提交
1785 1786
}

1787 1788 1789 1790 1791 1792
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;

1793
	if (tc_qdisc_dump_ignore(q, false) ||
1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820
	    *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;
1821
	int b;
1822 1823 1824 1825 1826 1827 1828

	if (!root)
		return 0;

	if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0)
		return -1;

1829 1830 1831
	if (!qdisc_dev(root))
		return 0;

1832 1833 1834 1835 1836 1837
	if (tcm->tcm_parent) {
		q = qdisc_match_from_root(root, TC_H_MAJ(tcm->tcm_parent));
		if (q && tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
			return -1;
		return 0;
	}
1838
	hash_for_each(qdisc_dev(root)->qdisc_hash, b, q, hash) {
1839 1840 1841 1842 1843 1844 1845
		if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0)
			return -1;
	}

	return 0;
}

L
Linus Torvalds 已提交
1846 1847
static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
{
1848
	struct tcmsg *tcm = nlmsg_data(cb->nlh);
1849
	struct net *net = sock_net(skb->sk);
1850
	struct netdev_queue *dev_queue;
L
Linus Torvalds 已提交
1851
	struct net_device *dev;
1852
	int t, s_t;
L
Linus Torvalds 已提交
1853

1854
	if (nlmsg_len(cb->nlh) < sizeof(*tcm))
L
Linus Torvalds 已提交
1855
		return 0;
E
Eric Dumazet 已提交
1856 1857
	dev = dev_get_by_index(net, tcm->tcm_ifindex);
	if (!dev)
L
Linus Torvalds 已提交
1858 1859 1860 1861 1862
		return 0;

	s_t = cb->args[0];
	t = 0;

1863
	if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0)
1864 1865
		goto done;

1866 1867 1868 1869
	dev_queue = dev_ingress_queue(dev);
	if (dev_queue &&
	    tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb,
				&t, s_t) < 0)
1870
		goto done;
L
Linus Torvalds 已提交
1871

1872
done:
L
Linus Torvalds 已提交
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882
	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",
1883
		   (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1),
1884
		   1000000,
1885
		   (u32)NSEC_PER_SEC / hrtimer_resolution);
L
Linus Torvalds 已提交
1886 1887 1888 1889 1890 1891

	return 0;
}

static int psched_open(struct inode *inode, struct file *file)
{
1892
	return single_open(file, psched_show, NULL);
L
Linus Torvalds 已提交
1893 1894
}

1895
static const struct file_operations psched_fops = {
L
Linus Torvalds 已提交
1896 1897 1898 1899 1900
	.owner = THIS_MODULE,
	.open = psched_open,
	.read  = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
1901
};
1902 1903 1904 1905 1906

static int __net_init psched_net_init(struct net *net)
{
	struct proc_dir_entry *e;

1907
	e = proc_create("psched", 0, net->proc_net, &psched_fops);
1908 1909 1910 1911 1912 1913 1914 1915
	if (e == NULL)
		return -ENOMEM;

	return 0;
}

static void __net_exit psched_net_exit(struct net *net)
{
1916
	remove_proc_entry("psched", net->proc_net);
1917 1918 1919 1920 1921 1922 1923 1924 1925 1926
}
#else
static int __net_init psched_net_init(struct net *net)
{
	return 0;
}

static void __net_exit psched_net_exit(struct net *net)
{
}
L
Linus Torvalds 已提交
1927 1928
#endif

1929 1930 1931 1932 1933
static struct pernet_operations psched_net_ops = {
	.init = psched_net_init,
	.exit = psched_net_exit,
};

L
Linus Torvalds 已提交
1934 1935
static int __init pktsched_init(void)
{
1936 1937 1938 1939
	int err;

	err = register_pernet_subsys(&psched_net_ops);
	if (err) {
E
Eric Dumazet 已提交
1940
		pr_err("pktsched_init: "
1941 1942 1943 1944
		       "cannot initialize per netns operations\n");
		return err;
	}

1945
	register_qdisc(&pfifo_fast_ops);
L
Linus Torvalds 已提交
1946 1947
	register_qdisc(&pfifo_qdisc_ops);
	register_qdisc(&bfifo_qdisc_ops);
1948
	register_qdisc(&pfifo_head_drop_qdisc_ops);
1949
	register_qdisc(&mq_qdisc_ops);
1950
	register_qdisc(&noqueue_qdisc_ops);
L
Linus Torvalds 已提交
1951

1952 1953
	rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL);
	rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL);
1954 1955
	rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc,
		      NULL);
1956 1957
	rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL);
	rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL);
1958 1959
	rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass,
		      NULL);
1960

L
Linus Torvalds 已提交
1961 1962 1963 1964
	return 0;
}

subsys_initcall(pktsched_init);
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