| /* |
| * 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/unregister 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); |
| |
| /* Get default qdisc if not otherwise specified */ |
| void qdisc_get_default(char *name, size_t len) |
| { |
| read_lock(&qdisc_mod_lock); |
| strlcpy(name, default_qdisc_ops->id, len); |
| read_unlock(&qdisc_mod_lock); |
| } |
| |
| static struct Qdisc_ops *qdisc_lookup_default(const char *name) |
| { |
| struct Qdisc_ops *q = NULL; |
| |
| for (q = qdisc_base; q; q = q->next) { |
| if (!strcmp(name, q->id)) { |
| if (!try_module_get(q->owner)) |
| q = NULL; |
| break; |
| } |
| } |
| |
| return q; |
| } |
| |
| /* Set new default qdisc to use */ |
| int qdisc_set_default(const char *name) |
| { |
| const struct Qdisc_ops *ops; |
| |
| if (!capable(CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| write_lock(&qdisc_mod_lock); |
| ops = qdisc_lookup_default(name); |
| if (!ops) { |
| /* Not found, drop lock and try to load module */ |
| write_unlock(&qdisc_mod_lock); |
| request_module("sch_%s", name); |
| write_lock(&qdisc_mod_lock); |
| |
| ops = qdisc_lookup_default(name); |
| } |
| |
| if (ops) { |
| /* Set new default */ |
| module_put(default_qdisc_ops->owner); |
| default_qdisc_ops = ops; |
| } |
| write_unlock(&qdisc_mod_lock); |
| |
| return ops ? 0 : -ENOENT; |
| } |
| |
| /* We know handle. Find qdisc among all qdisc's attached to device |
| * (root qdisc, all its children, children of children etc.) |
| * Note: caller either uses rtnl or rcu_read_lock() |
| */ |
| |
| 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_rcu(q, &root->list, list) { |
| if (q->handle == handle) |
| return q; |
| } |
| return NULL; |
| } |
| |
| void qdisc_list_add(struct Qdisc *q) |
| { |
| if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
| struct Qdisc *root = qdisc_dev(q)->qdisc; |
| |
| WARN_ON_ONCE(root == &noop_qdisc); |
| ASSERT_RTNL(); |
| list_add_tail_rcu(&q->list, &root->list); |
| } |
| } |
| EXPORT_SYMBOL(qdisc_list_add); |
| |
| void qdisc_list_del(struct Qdisc *q) |
| { |
| if ((q->parent != TC_H_ROOT) && !(q->flags & TCQ_F_INGRESS)) { |
| ASSERT_RTNL(); |
| list_del_rcu(&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; |
| } |
| |
| /* The linklayer setting were not transferred from iproute2, in older |
| * versions, and the rate tables lookup systems have been dropped in |
| * the kernel. To keep backward compatible with older iproute2 tc |
| * utils, we detect the linklayer setting by detecting if the rate |
| * table were modified. |
| * |
| * For linklayer ATM table entries, the rate table will be aligned to |
| * 48 bytes, thus some table entries will contain the same value. The |
| * mpu (min packet unit) is also encoded into the old rate table, thus |
| * starting from the mpu, we find low and high table entries for |
| * mapping this cell. If these entries contain the same value, when |
| * the rate tables have been modified for linklayer ATM. |
| * |
| * This is done by rounding mpu to the nearest 48 bytes cell/entry, |
| * and then roundup to the next cell, calc the table entry one below, |
| * and compare. |
| */ |
| static __u8 __detect_linklayer(struct tc_ratespec *r, __u32 *rtab) |
| { |
| int low = roundup(r->mpu, 48); |
| int high = roundup(low+1, 48); |
| int cell_low = low >> r->cell_log; |
| int cell_high = (high >> r->cell_log) - 1; |
| |
| /* rtab is too inaccurate at rates > 100Mbit/s */ |
| if ((r->rate > (100000000/8)) || (rtab[0] == 0)) { |
| pr_debug("TC linklayer: Giving up ATM detection\n"); |
| return TC_LINKLAYER_ETHERNET; |
| } |
| |
| if ((cell_high > cell_low) && (cell_high < 256) |
| && (rtab[cell_low] == rtab[cell_high])) { |
| pr_debug("TC linklayer: Detected ATM, low(%d)=high(%d)=%u\n", |
| cell_low, cell_high, rtab[cell_high]); |
| return TC_LINKLAYER_ATM; |
| } |
| return TC_LINKLAYER_ETHERNET; |
| } |
| |
| 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; |
| |
| if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
| nla_len(tab) != TC_RTAB_SIZE) |
| 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; |
| } |
| 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; |
| 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(); |
| qdisc_unthrottled(wd->qdisc); |
| __netif_schedule(qdisc_root(wd->qdisc)); |
| rcu_read_unlock(); |
| |
| return HRTIMER_NORESTART; |
| } |
| |
| void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) |
| { |
| hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED); |
| wd->timer.function = qdisc_watchdog; |
| wd->qdisc = qdisc; |
| } |
| EXPORT_SYMBOL(qdisc_watchdog_init); |
| |
| void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires, bool throttle) |
| { |
| if (test_bit(__QDISC_STATE_DEACTIVATED, |
| &qdisc_root_sleeping(wd->qdisc)->state)) |
| return; |
| |
| if (throttle) |
| qdisc_throttled(wd->qdisc); |
| |
| hrtimer_start(&wd->timer, |
| ns_to_ktime(expires), |
| HRTIMER_MODE_ABS_PINNED); |
| } |
| EXPORT_SYMBOL(qdisc_watchdog_schedule_ns); |
| |
| void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) |
| { |
| hrtimer_cancel(&wd->timer); |
| 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 *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); |
| |
| 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; |
| int drops; |
| |
| if (n == 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; |
| /* 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 (cops->qlen_notify) { |
| cl = cops->get(sch, parentid); |
| cops->qlen_notify(sch, cl); |
| cops->put(sch, cl); |
| } |
| sch->q.qlen -= n; |
| __qdisc_qstats_drop(sch, drops); |
| } |
| rcu_read_unlock(); |
| } |
| 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) |
| 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) |
| atomic_inc(&new->refcnt); |
| |
| if (!ingress) |
| qdisc_destroy(old); |
| } |
| |
| skip: |
| 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; |
| |
| 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; |
| |
| 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); |
| if (!netif_is_multiqueue(dev)) |
| sch->flags |= TCQ_F_ONETXQUEUE | TCQ_F_NOPARENT; |
| } |
| |
| sch->handle = handle; |
| |
| if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
| if (qdisc_is_percpu_stats(sch)) { |
| sch->cpu_bstats = |
| netdev_alloc_pcpu_stats(struct gnet_stats_basic_cpu); |
| if (!sch->cpu_bstats) |
| goto err_out4; |
| |
| sch->cpu_qstats = alloc_percpu(struct gnet_stats_queue); |
| if (!sch->cpu_qstats) |
| goto err_out4; |
| } |
| |
| 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->cpu_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: |
| free_percpu(sch->cpu_bstats); |
| free_percpu(sch->cpu_qstats); |
| /* |
| * 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->cpu_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) |
| { |
| 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(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 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) |
| 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) |
| { |
| 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(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 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) |
| 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 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 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 = atomic_read(&q->refcnt); |
| if (nla_put_string(skb, TCA_KIND, q->ops->id)) |
| goto nla_put_failure; |
| if (q->ops->dump && q->ops->dump(q, skb) < 0) |
| goto nla_put_failure; |
| 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 (qdisc_is_percpu_stats(q)) { |
| cpu_bstats = q->cpu_bstats; |
| cpu_qstats = q->cpu_qstats; |
| } |
| |
| if (gnet_stats_copy_basic(&d, cpu_bstats, &q->bstats) < 0 || |
| gnet_stats_copy_rate_est(&d, &q->bstats, &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) |
| { |
| 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 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)) { |
| 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)) { |
| 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 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).portid, |
| 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).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; |
| |
| s_idx = cb->args[0]; |
| s_q_idx = q_idx = cb->args[1]; |
| |
| idx = 0; |
| ASSERT_RTNL(); |
| 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) < 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: |
| 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) |
| { |
| 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(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 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->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, portid, 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 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, |
| 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; |
| |
| 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; |
| |
| 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; |
| } |
| |
| return rtnetlink_send(skb, net, portid, 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).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) || |
| *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 = nlmsg_data(cb->nlh); |
| struct net *net = sock_net(skb->sk); |
| struct netdev_queue *dev_queue; |
| struct net_device *dev; |
| int t, s_t; |
| |
| if (nlmsg_len(cb->nlh) < sizeof(*tcm)) |
| return 0; |
| dev = dev_get_by_index(net, tcm->tcm_ifindex); |
| if (!dev) |
| return 0; |
| |
| s_t = cb->args[0]; |
| t = 0; |
| |
| if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t) < 0) |
| goto done; |
| |
| dev_queue = dev_ingress_queue(dev); |
| if (dev_queue && |
| tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, |
| &t, s_t) < 0) |
| goto done; |
| |
| done: |
| cb->args[0] = t; |
| |
| dev_put(dev); |
| return skb->len; |
| } |
| |
| /* Main classifier routine: scans classifier chain attached |
| * to this qdisc, (optionally) tests for protocol and asks |
| * specific classifiers. |
| */ |
| int tc_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
| struct tcf_result *res, bool compat_mode) |
| { |
| __be16 protocol = tc_skb_protocol(skb); |
| #ifdef CONFIG_NET_CLS_ACT |
| const struct tcf_proto *old_tp = tp; |
| int limit = 0; |
| |
| reclassify: |
| #endif |
| for (; tp; tp = rcu_dereference_bh(tp->next)) { |
| int err; |
| |
| if (tp->protocol != protocol && |
| tp->protocol != htons(ETH_P_ALL)) |
| continue; |
| |
| err = tp->classify(skb, tp, res); |
| #ifdef CONFIG_NET_CLS_ACT |
| if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) |
| goto reset; |
| #endif |
| if (err >= 0) |
| return err; |
| } |
| |
| return -1; |
| #ifdef CONFIG_NET_CLS_ACT |
| reset: |
| if (unlikely(limit++ >= MAX_REC_LOOP)) { |
| net_notice_ratelimited("%s: reclassify loop, rule prio %u, protocol %02x\n", |
| tp->q->ops->id, tp->prio & 0xffff, |
| ntohs(tp->protocol)); |
| return TC_ACT_SHOT; |
| } |
| |
| tp = old_tp; |
| goto reclassify; |
| #endif |
| } |
| EXPORT_SYMBOL(tc_classify); |
| |
| bool tcf_destroy(struct tcf_proto *tp, bool force) |
| { |
| if (tp->ops->destroy(tp, force)) { |
| module_put(tp->ops->owner); |
| kfree_rcu(tp, rcu); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void tcf_destroy_chain(struct tcf_proto __rcu **fl) |
| { |
| struct tcf_proto *tp; |
| |
| while ((tp = rtnl_dereference(*fl)) != NULL) { |
| RCU_INIT_POINTER(*fl, tp->next); |
| tcf_destroy(tp, true); |
| } |
| } |
| EXPORT_SYMBOL(tcf_destroy_chain); |
| |
| #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 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_create("psched", 0, net->proc_net, &psched_fops); |
| 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, 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); |