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2305 lines
55 KiB
2305 lines
55 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* net/sched/sch_api.c Packet scheduler API. |
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* |
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* Authors: Alexey Kuznetsov, <[email protected]> |
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* |
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* Fixes: |
|
* |
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* Rani Assaf <[email protected]> :980802: JIFFIES and CPU clock sources are repaired. |
|
* Eduardo J. Blanco <[email protected]> :990222: kmod support |
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* Jamal Hadi Salim <[email protected]>: 990601: ingress support |
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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> |
|
|
|
#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> |
|
|
|
#include <trace/events/qdisc.h> |
|
|
|
/* |
|
|
|
Short review. |
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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. |
|
|
|
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: |
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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", |
|
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 |
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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. |
|
|
|
|
|
|
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Every discipline has two major routines: enqueue and dequeue. |
|
|
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---dequeue |
|
|
|
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. |
|
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. |
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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. |
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|
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---destroy |
|
|
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destroys resources allocated by init and during lifetime of qdisc. |
|
|
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---change |
|
|
|
changes qdisc parameters. |
|
*/ |
|
|
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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); |
|
|
|
|
|
/************************************************ |
|
* Queueing disciplines manipulation. * |
|
************************************************/ |
|
|
|
|
|
/* The list of all installed queueing disciplines. */ |
|
|
|
static struct Qdisc_ops *qdisc_base; |
|
|
|
/* Register/unregister queueing discipline */ |
|
|
|
int register_qdisc(struct Qdisc_ops *qops) |
|
{ |
|
struct Qdisc_ops *q, **qp; |
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int rc = -EEXIST; |
|
|
|
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; |
|
|
|
if (qops->enqueue == NULL) |
|
qops->enqueue = noop_qdisc_ops.enqueue; |
|
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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if (qops->dequeue == NULL) |
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qops->dequeue = noop_qdisc_ops.dequeue; |
|
|
|
if (qops->cl_ops) { |
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const struct Qdisc_class_ops *cops = qops->cl_ops; |
|
|
|
if (!(cops->find && cops->walk && cops->leaf)) |
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goto out_einval; |
|
|
|
if (cops->tcf_block && !(cops->bind_tcf && cops->unbind_tcf)) |
|
goto out_einval; |
|
} |
|
|
|
qops->next = NULL; |
|
*qp = qops; |
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rc = 0; |
|
out: |
|
write_unlock(&qdisc_mod_lock); |
|
return rc; |
|
|
|
out_einval: |
|
rc = -EINVAL; |
|
goto out; |
|
} |
|
EXPORT_SYMBOL(register_qdisc); |
|
|
|
int unregister_qdisc(struct Qdisc_ops *qops) |
|
{ |
|
struct Qdisc_ops *q, **qp; |
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int err = -ENOENT; |
|
|
|
write_lock(&qdisc_mod_lock); |
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for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
|
if (q == qops) |
|
break; |
|
if (q) { |
|
*qp = q->next; |
|
q->next = NULL; |
|
err = 0; |
|
} |
|
write_unlock(&qdisc_mod_lock); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(unregister_qdisc); |
|
|
|
/* 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); |
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read_unlock(&qdisc_mod_lock); |
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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; |
|
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)) |
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return -EPERM; |
|
|
|
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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|
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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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lockdep_rtnl_is_held()) { |
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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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|
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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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|
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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; |
|
|
|
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); |
|
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) |
|
{ |
|
unsigned long cl; |
|
const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
|
|
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if (cops == NULL) |
|
return NULL; |
|
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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struct Qdisc_ops *q = NULL; |
|
|
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if (kind) { |
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read_lock(&qdisc_mod_lock); |
|
for (q = qdisc_base; q; q = q->next) { |
|
if (nla_strcmp(kind, q->id) == 0) { |
|
if (!try_module_get(q->owner)) |
|
q = NULL; |
|
break; |
|
} |
|
} |
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read_unlock(&qdisc_mod_lock); |
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} |
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return q; |
|
} |
|
|
|
/* 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 |
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* utils, we detect the linklayer setting by detecting if the rate |
|
* table were modified. |
|
* |
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* 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; |
|
} |
|
|
|
static struct qdisc_rate_table *qdisc_rtab_list; |
|
|
|
struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, |
|
struct nlattr *tab, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct qdisc_rate_table *rtab; |
|
|
|
if (tab == NULL || r->rate == 0 || |
|
r->cell_log == 0 || r->cell_log >= 32 || |
|
nla_len(tab) != TC_RTAB_SIZE) { |
|
NL_SET_ERR_MSG(extack, "Invalid rate table parameters for searching"); |
|
return NULL; |
|
} |
|
|
|
for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
|
if (!memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) && |
|
!memcmp(&rtab->data, nla_data(tab), 1024)) { |
|
rtab->refcnt++; |
|
return rtab; |
|
} |
|
} |
|
|
|
rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
|
if (rtab) { |
|
rtab->rate = *r; |
|
rtab->refcnt = 1; |
|
memcpy(rtab->data, nla_data(tab), 1024); |
|
if (r->linklayer == TC_LINKLAYER_UNAWARE) |
|
r->linklayer = __detect_linklayer(r, rtab->data); |
|
rtab->next = qdisc_rtab_list; |
|
qdisc_rtab_list = rtab; |
|
} else { |
|
NL_SET_ERR_MSG(extack, "Failed to allocate new qdisc rate table"); |
|
} |
|
return rtab; |
|
} |
|
EXPORT_SYMBOL(qdisc_get_rtab); |
|
|
|
void qdisc_put_rtab(struct qdisc_rate_table *tab) |
|
{ |
|
struct qdisc_rate_table *rtab, **rtabp; |
|
|
|
if (!tab || --tab->refcnt) |
|
return; |
|
|
|
for (rtabp = &qdisc_rtab_list; |
|
(rtab = *rtabp) != NULL; |
|
rtabp = &rtab->next) { |
|
if (rtab == tab) { |
|
*rtabp = rtab->next; |
|
kfree(rtab); |
|
return; |
|
} |
|
} |
|
} |
|
EXPORT_SYMBOL(qdisc_put_rtab); |
|
|
|
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 netlink_ext_ack *extack) |
|
{ |
|
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; |
|
|
|
err = nla_parse_nested_deprecated(tb, TCA_STAB_MAX, opt, stab_policy, |
|
extack); |
|
if (err < 0) |
|
return ERR_PTR(err); |
|
if (!tb[TCA_STAB_BASE]) { |
|
NL_SET_ERR_MSG(extack, "Size table base attribute is missing"); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
|
|
s = nla_data(tb[TCA_STAB_BASE]); |
|
|
|
if (s->tsize > 0) { |
|
if (!tb[TCA_STAB_DATA]) { |
|
NL_SET_ERR_MSG(extack, "Size table data attribute is missing"); |
|
return ERR_PTR(-EINVAL); |
|
} |
|
tab = nla_data(tb[TCA_STAB_DATA]); |
|
tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); |
|
} |
|
|
|
if (tsize != s->tsize || (!tab && tsize > 0)) { |
|
NL_SET_ERR_MSG(extack, "Invalid size of size table"); |
|
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; |
|
} |
|
|
|
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_range_ns(struct qdisc_watchdog *wd, u64 expires, |
|
u64 delta_ns) |
|
{ |
|
if (test_bit(__QDISC_STATE_DEACTIVATED, |
|
&qdisc_root_sleeping(wd->qdisc)->state)) |
|
return; |
|
|
|
if (hrtimer_is_queued(&wd->timer)) { |
|
/* If timer is already set in [expires, expires + delta_ns], |
|
* do not reprogram it. |
|
*/ |
|
if (wd->last_expires - expires <= delta_ns) |
|
return; |
|
} |
|
|
|
wd->last_expires = expires; |
|
hrtimer_start_range_ns(&wd->timer, |
|
ns_to_ktime(expires), |
|
delta_ns, |
|
HRTIMER_MODE_ABS_PINNED); |
|
} |
|
EXPORT_SYMBOL(qdisc_watchdog_schedule_range_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->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_strscpy(name, kind, IFNAMSIZ) >= 0) { |
|
/* 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); |
|
trace_qdisc_create(ops, dev, parent); |
|
|
|
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, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
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, extack); |
|
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; |
|
unsigned long base; |
|
unsigned long cl; |
|
u32 classid; |
|
}; |
|
|
|
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, q, a->base); |
|
sch_tree_unlock(q); |
|
} |
|
return 0; |
|
} |
|
|
|
struct tc_bind_class_args { |
|
struct qdisc_walker w; |
|
unsigned long new_cl; |
|
u32 portid; |
|
u32 clid; |
|
}; |
|
|
|
static int tc_bind_class_walker(struct Qdisc *q, unsigned long cl, |
|
struct qdisc_walker *w) |
|
{ |
|
struct tc_bind_class_args *a = (struct tc_bind_class_args *)w; |
|
const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
|
struct tcf_block *block; |
|
struct tcf_chain *chain; |
|
|
|
block = cops->tcf_block(q, cl, NULL); |
|
if (!block) |
|
return 0; |
|
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); |
|
tp; tp = tcf_get_next_proto(chain, tp)) { |
|
struct tcf_bind_args arg = {}; |
|
|
|
arg.w.fn = tcf_node_bind; |
|
arg.classid = a->clid; |
|
arg.base = cl; |
|
arg.cl = a->new_cl; |
|
tp->ops->walk(tp, &arg.w, true); |
|
} |
|
} |
|
|
|
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 tc_bind_class_args args = {}; |
|
|
|
if (!cops->tcf_block) |
|
return; |
|
args.portid = portid; |
|
args.clid = clid; |
|
args.new_cl = new_cl; |
|
args.w.fn = tc_bind_class_walker; |
|
q->ops->cl_ops->walk(q, &args.w); |
|
} |
|
|
|
#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, extack); |
|
/* 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, bool recur) |
|
{ |
|
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) || !recur) |
|
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, true) < 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, false) < 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);
|
|
|