diff options
Diffstat (limited to 'net/sched/sch_api.c')
| -rw-r--r-- | net/sched/sch_api.c | 1809 |
1 files changed, 1809 insertions, 0 deletions
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c new file mode 100644 index 00000000..3d8981fd --- /dev/null +++ b/net/sched/sch_api.c @@ -0,0 +1,1809 @@ +/* + * 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> +#include <linux/hrtimer.h> +#include <linux/lockdep.h> +#include <linux/slab.h> + +#include <net/net_namespace.h> +#include <net/sock.h> +#include <net/netlink.h> +#include <net/pkt_sched.h> + +static int qdisc_notify(struct net *net, struct sk_buff *oskb, + struct nlmsghdr *n, u32 clid, + struct Qdisc *old, struct Qdisc *new); +static int tclass_notify(struct net *net, struct sk_buff *oskb, + struct nlmsghdr *n, struct Qdisc *q, + unsigned long cl, int event); + +/* + + 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 + NET_XMIT_POLICED - dropped by police. + Expected action: backoff or error to real-time apps. + + Auxiliary routines: + + ---peek + + like dequeue but without removing a packet from the queue + + ---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; + +/* Register/uregister queueing discipline */ + +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; + if (qops->peek == NULL) { + if (qops->dequeue == NULL) + qops->peek = noop_qdisc_ops.peek; + else + goto out_einval; + } + if (qops->dequeue == NULL) + qops->dequeue = noop_qdisc_ops.dequeue; + + if (qops->cl_ops) { + const struct Qdisc_class_ops *cops = qops->cl_ops; + + if (!(cops->get && cops->put && cops->walk && cops->leaf)) + goto out_einval; + + if (cops->tcf_chain && !(cops->bind_tcf && cops->unbind_tcf)) + goto out_einval; + } + + qops->next = NULL; + *qp = qops; + 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; + int err = -ENOENT; + + write_lock(&qdisc_mod_lock); + 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); + +/* We know handle. Find qdisc among all qdisc's attached to device + (root qdisc, all its children, children of children etc.) + */ + +static struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) +{ + struct Qdisc *q; + + if (!(root->flags & TCQ_F_BUILTIN) && + root->handle == handle) + return root; + + list_for_each_entry(q, &root->list, list) { + if (q->handle == handle) + return q; + } + return NULL; +} + +static void qdisc_list_add(struct Qdisc *q) +{ + if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) + list_add_tail(&q->list, &qdisc_dev(q)->qdisc->list); +} + +void qdisc_list_del(struct Qdisc *q) +{ + if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) + list_del(&q->list); +} +EXPORT_SYMBOL(qdisc_list_del); + +struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) +{ + struct Qdisc *q; + + q = qdisc_match_from_root(dev->qdisc, handle); + if (q) + goto out; + + if (dev_ingress_queue(dev)) + q = qdisc_match_from_root( + dev_ingress_queue(dev)->qdisc_sleeping, + handle); +out: + return q; +} + +static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) +{ + unsigned long cl; + struct Qdisc *leaf; + const struct Qdisc_class_ops *cops = p->ops->cl_ops; + + 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 */ + +static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) +{ + struct Qdisc_ops *q = NULL; + + if (kind) { + 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; + } + } + read_unlock(&qdisc_mod_lock); + } + return q; +} + +static struct qdisc_rate_table *qdisc_rtab_list; + +struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) +{ + struct qdisc_rate_table *rtab; + + for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { + if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { + rtab->refcnt++; + return rtab; + } + } + + if (tab == NULL || r->rate == 0 || r->cell_log == 0 || + nla_len(tab) != TC_RTAB_SIZE) + return NULL; + + rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); + if (rtab) { + rtab->rate = *r; + rtab->refcnt = 1; + memcpy(rtab->data, nla_data(tab), 1024); + rtab->next = qdisc_rtab_list; + qdisc_rtab_list = rtab; + } + 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 DEFINE_SPINLOCK(qdisc_stab_lock); + +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; + + err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); + 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); + } + + if (tsize != s->tsize || (!tab && tsize > 0)) + return ERR_PTR(-EINVAL); + + spin_lock(&qdisc_stab_lock); + + 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++; + spin_unlock(&qdisc_stab_lock); + return stab; + } + + spin_unlock(&qdisc_stab_lock); + + 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)); + + spin_lock(&qdisc_stab_lock); + list_add_tail(&stab->list, &qdisc_stab_list); + spin_unlock(&qdisc_stab_lock); + + return stab; +} + +static void stab_kfree_rcu(struct rcu_head *head) +{ + kfree(container_of(head, struct qdisc_size_table, rcu)); +} + +void qdisc_put_stab(struct qdisc_size_table *tab) +{ + if (!tab) + return; + + spin_lock(&qdisc_stab_lock); + + if (--tab->refcnt == 0) { + list_del(&tab->list); + call_rcu_bh(&tab->rcu, stab_kfree_rcu); + } + + spin_unlock(&qdisc_stab_lock); +} +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); + if (nest == NULL) + goto nla_put_failure; + NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); + 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(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); + + qdisc_unthrottled(wd->qdisc); + __netif_schedule(qdisc_root(wd->qdisc)); + + return HRTIMER_NORESTART; +} + +void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) +{ + hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + wd->timer.function = qdisc_watchdog; + wd->qdisc = qdisc; +} +EXPORT_SYMBOL(qdisc_watchdog_init); + +void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) +{ + ktime_t time; + + if (test_bit(__QDISC_STATE_DEACTIVATED, + &qdisc_root_sleeping(wd->qdisc)->state)) + return; + + qdisc_throttled(wd->qdisc); + time = ktime_set(0, 0); + time = ktime_add_ns(time, PSCHED_TICKS2NS(expires)); + hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); +} +EXPORT_SYMBOL(qdisc_watchdog_schedule); + +void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) +{ + hrtimer_cancel(&wd->timer); + qdisc_unthrottled(wd->qdisc); +} +EXPORT_SYMBOL(qdisc_watchdog_cancel); + +static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) +{ + 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; + struct hlist_node *n, *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, n, 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); + + 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); + +/* 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_decrease_qlen(struct Qdisc *sch, unsigned int n) +{ + const struct Qdisc_class_ops *cops; + unsigned long cl; + u32 parentid; + + if (n == 0) + return; + while ((parentid = sch->parent)) { + if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) + return; + + sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); + if (sch == NULL) { + WARN_ON(parentid != TC_H_ROOT); + return; + } + 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; + } +} +EXPORT_SYMBOL(qdisc_tree_decrease_qlen); + +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_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. + */ + +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 Qdisc *q = old; + struct net *net = dev_net(dev); + int err = 0; + + 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)) + return -ENOENT; + } + + if (dev->flags & IFF_UP) + dev_deactivate(dev); + + if (new && new->ops->attach) { + new->ops->attach(new); + num_q = 0; + } + + 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) + atomic_inc(&new->refcnt); + + if (!ingress) + qdisc_destroy(old); + } + + if (!ingress) { + notify_and_destroy(net, skb, n, classid, + dev->qdisc, new); + if (new && !new->ops->attach) + atomic_inc(&new->refcnt); + dev->qdisc = new ? : &noop_qdisc; + } 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; + + err = -EOPNOTSUPP; + if (cops && cops->graft) { + unsigned long cl = cops->get(parent, classid); + if (cl) { + err = cops->graft(parent, cl, new, &old); + cops->put(parent, cl); + } else + err = -ENOENT; + } + if (!err) + notify_and_destroy(net, skb, n, classid, old, new); + } + return err; +} + +/* 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; + +/* + 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) +{ + int err; + struct nlattr *kind = tca[TCA_KIND]; + struct Qdisc *sch; + struct Qdisc_ops *ops; + struct qdisc_size_table *stab; + + ops = qdisc_lookup_ops(kind); +#ifdef CONFIG_MODULES + if (ops == NULL && kind != NULL) { + char name[IFNAMSIZ]; + if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { + /* We dropped the RTNL semaphore in order to + * perform the module load. So, even if we + * succeeded in loading the module we have to + * tell the caller to replay the request. We + * indicate this using -EAGAIN. + * We replay the request because the device may + * go away in the mean time. + */ + rtnl_unlock(); + request_module("sch_%s", name); + rtnl_lock(); + ops = qdisc_lookup_ops(kind); + if (ops != NULL) { + /* We will try again qdisc_lookup_ops, + * so don't keep a reference. + */ + module_put(ops->owner); + err = -EAGAIN; + goto err_out; + } + } + } +#endif + + err = -ENOENT; + if (ops == NULL) + goto err_out; + + sch = qdisc_alloc(dev_queue, ops); + 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); + lockdep_set_class(qdisc_lock(sch), &qdisc_rx_lock); + } else { + if (handle == 0) { + handle = qdisc_alloc_handle(dev); + err = -ENOMEM; + if (handle == 0) + goto err_out3; + } + lockdep_set_class(qdisc_lock(sch), &qdisc_tx_lock); + } + + sch->handle = handle; + + if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { + if (tca[TCA_STAB]) { + stab = qdisc_get_stab(tca[TCA_STAB]); + if (IS_ERR(stab)) { + err = PTR_ERR(stab); + goto err_out4; + } + rcu_assign_pointer(sch->stab, stab); + } + if (tca[TCA_RATE]) { + spinlock_t *root_lock; + + err = -EOPNOTSUPP; + if (sch->flags & TCQ_F_MQROOT) + goto err_out4; + + if ((sch->parent != TC_H_ROOT) && + !(sch->flags & TCQ_F_INGRESS) && + (!p || !(p->flags & TCQ_F_MQROOT))) + root_lock = qdisc_root_sleeping_lock(sch); + else + root_lock = qdisc_lock(sch); + + err = gen_new_estimator(&sch->bstats, &sch->rate_est, + root_lock, tca[TCA_RATE]); + if (err) + goto err_out4; + } + + qdisc_list_add(sch); + + return sch; + } +err_out3: + dev_put(dev); + kfree((char *) sch - sch->padded); +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 qdisc_size_table *ostab, *stab = NULL; + int err = 0; + + if (tca[TCA_OPTIONS]) { + if (sch->ops->change == NULL) + return -EINVAL; + err = sch->ops->change(sch, tca[TCA_OPTIONS]); + if (err) + return err; + } + + if (tca[TCA_STAB]) { + stab = qdisc_get_stab(tca[TCA_STAB]); + 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->rate_est, + qdisc_root_sleeping_lock(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; +} + +/* + * Delete/get qdisc. + */ + +static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) +{ + 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 = tcm->tcm_parent; + struct Qdisc *q = NULL; + struct Qdisc *p = NULL; + int err; + + dev = __dev_get_by_index(net, tcm->tcm_ifindex); + if (!dev) + return -ENODEV; + + err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); + if (err < 0) + return err; + + 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) + 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) + return -ENOENT; + + if (tcm->tcm_handle && q->handle != tcm->tcm_handle) + return -EINVAL; + } else { + q = qdisc_lookup(dev, tcm->tcm_handle); + if (!q) + return -ENOENT; + } + + if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) + return -EINVAL; + + if (n->nlmsg_type == RTM_DELQDISC) { + if (!clid) + return -EINVAL; + if (q->handle == 0) + return -ENOENT; + err = qdisc_graft(dev, p, skb, n, clid, NULL, q); + 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, void *arg) +{ + 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; + +replay: + /* Reinit, just in case something touches this. */ + tcm = NLMSG_DATA(n); + clid = tcm->tcm_parent; + q = p = NULL; + + dev = __dev_get_by_index(net, tcm->tcm_ifindex); + if (!dev) + return -ENODEV; + + err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); + if (err < 0) + return err; + + if (clid) { + if (clid != TC_H_ROOT) { + if (clid != TC_H_INGRESS) { + p = qdisc_lookup(dev, TC_H_MAJ(clid)); + if (!p) + 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)) + return -EEXIST; + if (TC_H_MIN(tcm->tcm_handle)) + return -EINVAL; + q = qdisc_lookup(dev, tcm->tcm_handle); + if (!q) + goto create_n_graft; + if (n->nlmsg_flags & NLM_F_EXCL) + return -EEXIST; + if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) + return -EINVAL; + if (q == p || + (p && check_loop(q, p, 0))) + return -ELOOP; + atomic_inc(&q->refcnt); + 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) + return -EINVAL; + q = qdisc_lookup(dev, tcm->tcm_handle); + } + + /* Change qdisc parameters */ + if (q == NULL) + return -ENOENT; + if (n->nlmsg_flags & NLM_F_EXCL) + return -EEXIST; + if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) + return -EINVAL; + err = qdisc_change(q, tca); + if (err == 0) + qdisc_notify(net, skb, n, clid, NULL, q); + return err; + +create_n_graft: + if (!(n->nlmsg_flags & NLM_F_CREATE)) + 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); + else + 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); + } + if (q == NULL) { + if (err == -EAGAIN) + goto replay; + return err; + } + +graft: + err = qdisc_graft(dev, p, skb, n, clid, q, NULL); + if (err) { + if (q) + qdisc_destroy(q); + return err; + } + + return 0; +} + +static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, + u32 pid, u32 seq, u16 flags, int event) +{ + struct tcmsg *tcm; + struct nlmsghdr *nlh; + unsigned char *b = skb_tail_pointer(skb); + struct gnet_dump d; + struct qdisc_size_table *stab; + + nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); + 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 = atomic_read(&q->refcnt); + NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); + if (q->ops->dump && q->ops->dump(q, skb) < 0) + goto nla_put_failure; + q->qstats.qlen = q->q.qlen; + + 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, + qdisc_root_sleeping_lock(q), &d) < 0) + goto nla_put_failure; + + if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) + goto nla_put_failure; + + if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || + gnet_stats_copy_rate_est(&d, &q->bstats, &q->rate_est) < 0 || + gnet_stats_copy_queue(&d, &q->qstats) < 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; + +nlmsg_failure: +nla_put_failure: + nlmsg_trim(skb, b); + return -1; +} + +static bool tc_qdisc_dump_ignore(struct Qdisc *q) +{ + return (q->flags & TCQ_F_BUILTIN) ? true : 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 pid = oskb ? NETLINK_CB(oskb).pid : 0; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + if (old && !tc_qdisc_dump_ignore(old)) { + if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, + 0, RTM_DELQDISC) < 0) + goto err_out; + } + if (new && !tc_qdisc_dump_ignore(new)) { + if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, + old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) + goto err_out; + } + + if (skb->len) + return rtnetlink_send(skb, net, pid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); + +err_out: + kfree_skb(skb); + return -EINVAL; +} + +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) +{ + int ret = 0, q_idx = *q_idx_p; + struct Qdisc *q; + + if (!root) + return 0; + + q = root; + if (q_idx < s_q_idx) { + q_idx++; + } else { + if (!tc_qdisc_dump_ignore(q) && + tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, + cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) + goto done; + q_idx++; + } + list_for_each_entry(q, &root->list, list) { + if (q_idx < s_q_idx) { + q_idx++; + continue; + } + if (!tc_qdisc_dump_ignore(q) && + tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, + 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; + + s_idx = cb->args[0]; + s_q_idx = q_idx = cb->args[1]; + + rcu_read_lock(); + idx = 0; + for_each_netdev_rcu(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) < 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) < 0) + goto done; + +cont: + idx++; + } + +done: + rcu_read_unlock(); + + cb->args[0] = idx; + cb->args[1] = q_idx; + + return skb->len; +} + + + +/************************************************ + * Traffic classes manipulation. * + ************************************************/ + + + +static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) +{ + 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 pid = tcm->tcm_parent; + u32 clid = tcm->tcm_handle; + u32 qid = TC_H_MAJ(clid); + int err; + + dev = __dev_get_by_index(net, tcm->tcm_ifindex); + if (!dev) + return -ENODEV; + + err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); + if (err < 0) + return err; + + /* + 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 */ + + if (pid != TC_H_ROOT) { + u32 qid1 = TC_H_MAJ(pid); + + 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(pid) still may be unspecified, complete it now. + */ + if (pid) + pid = TC_H_MAKE(qid, pid); + } 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 (pid == TC_H_ROOT) + clid = qid; + } else + clid = TC_H_MAKE(qid, clid); + + if (clid) + cl = cops->get(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 = -EOPNOTSUPP; + if (cops->delete) + err = cops->delete(q, cl); + if (err == 0) + tclass_notify(net, skb, n, q, cl, RTM_DELTCLASS); + goto out; + case RTM_GETTCLASS: + err = tclass_notify(net, skb, n, q, cl, RTM_NEWTCLASS); + goto out; + default: + err = -EINVAL; + goto out; + } + } + + new_cl = cl; + err = -EOPNOTSUPP; + if (cops->change) + err = cops->change(q, clid, pid, tca, &new_cl); + if (err == 0) + tclass_notify(net, skb, n, q, new_cl, RTM_NEWTCLASS); + +out: + if (cl) + cops->put(q, cl); + + return err; +} + + +static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, + unsigned long cl, + u32 pid, 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; + + nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); + 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; + NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); + 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, + qdisc_root_sleeping_lock(q), &d) < 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; + +nlmsg_failure: +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 pid = oskb ? NETLINK_CB(oskb).pid : 0; + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { + kfree_skb(skb); + return -EINVAL; + } + + return rtnetlink_send(skb, net, pid, RTNLGRP_TC, + n->nlmsg_flags & NLM_F_ECHO); +} + +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).pid, + 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) || + *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; + + if (!root) + return 0; + + if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) + return -1; + + list_for_each_entry(q, &root->list, list) { + 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 = (struct tcmsg *)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 (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) + return 0; + dev = dev_get_by_index(net, tcm->tcm_ifindex); + if (!dev) + return 0; + + s_t = cb->args[0]; + t = 0; + + if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) + goto done; + + dev_queue = dev_ingress_queue(dev); + if (dev_queue && + tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, + &t, s_t) < 0) + goto done; + +done: + cb->args[0] = t; + + dev_put(dev); + return skb->len; +} + +/* Main classifier routine: scans classifier chain attached + * to this qdisc, (optionally) tests for protocol and asks + * specific classifiers. + */ +int tc_classify_compat(struct sk_buff *skb, const struct tcf_proto *tp, + struct tcf_result *res) +{ + __be16 protocol = skb->protocol; + int err; + + for (; tp; tp = tp->next) { + if (tp->protocol != protocol && + tp->protocol != htons(ETH_P_ALL)) + continue; + err = tp->classify(skb, tp, res); + + if (err >= 0) { +#ifdef CONFIG_NET_CLS_ACT + if (err != TC_ACT_RECLASSIFY && skb->tc_verd) + skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); +#endif + return err; + } + } + return -1; +} +EXPORT_SYMBOL(tc_classify_compat); + +int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, + struct tcf_result *res) +{ + int err = 0; +#ifdef CONFIG_NET_CLS_ACT + const struct tcf_proto *otp = tp; +reclassify: +#endif + + err = tc_classify_compat(skb, tp, res); +#ifdef CONFIG_NET_CLS_ACT + if (err == TC_ACT_RECLASSIFY) { + u32 verd = G_TC_VERD(skb->tc_verd); + tp = otp; + + if (verd++ >= MAX_REC_LOOP) { + if (net_ratelimit()) + pr_notice("%s: packet reclassify loop" + " rule prio %u protocol %02x\n", + tp->q->ops->id, + tp->prio & 0xffff, + ntohs(tp->protocol)); + return TC_ACT_SHOT; + } + skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); + goto reclassify; + } +#endif + return err; +} +EXPORT_SYMBOL(tc_classify); + +void tcf_destroy(struct tcf_proto *tp) +{ + tp->ops->destroy(tp); + module_put(tp->ops->owner); + kfree(tp); +} + +void tcf_destroy_chain(struct tcf_proto **fl) +{ + struct tcf_proto *tp; + + while ((tp = *fl) != NULL) { + *fl = tp->next; + tcf_destroy(tp); + } +} +EXPORT_SYMBOL(tcf_destroy_chain); + +#ifdef CONFIG_PROC_FS +static int psched_show(struct seq_file *seq, void *v) +{ + struct timespec ts; + + hrtimer_get_res(CLOCK_MONOTONIC, &ts); + seq_printf(seq, "%08x %08x %08x %08x\n", + (u32)NSEC_PER_USEC, (u32)PSCHED_TICKS2NS(1), + 1000000, + (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); + + return 0; +} + +static int psched_open(struct inode *inode, struct file *file) +{ + return single_open(file, psched_show, NULL); +} + +static const struct file_operations psched_fops = { + .owner = THIS_MODULE, + .open = psched_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __net_init psched_net_init(struct net *net) +{ + struct proc_dir_entry *e; + + e = proc_net_fops_create(net, "psched", 0, &psched_fops); + if (e == NULL) + return -ENOMEM; + + return 0; +} + +static void __net_exit psched_net_exit(struct net *net) +{ + proc_net_remove(net, "psched"); +} +#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_qdisc_ops); + register_qdisc(&bfifo_qdisc_ops); + register_qdisc(&pfifo_head_drop_qdisc_ops); + register_qdisc(&mq_qdisc_ops); + + rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL, NULL); + rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL, NULL); + rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc, NULL); + rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL, NULL); + rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL, NULL); + rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass, NULL); + + return 0; +} + +subsys_initcall(pktsched_init); |