Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/sch_api.c Packet scheduler API. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * |
| 11 | * Fixes: |
| 12 | * |
| 13 | * Rani Assaf <rani@magic.metawire.com> :980802: JIFFIES and CPU clock sources are repaired. |
| 14 | * Eduardo J. Blanco <ejbs@netlabs.com.uy> :990222: kmod support |
| 15 | * Jamal Hadi Salim <hadi@nortelnetworks.com>: 990601: ingress support |
| 16 | */ |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/module.h> |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/skbuff.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/init.h> |
| 25 | #include <linux/proc_fs.h> |
| 26 | #include <linux/seq_file.h> |
| 27 | #include <linux/kmod.h> |
| 28 | #include <linux/list.h> |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 29 | #include <linux/hrtimer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 31 | #include <net/net_namespace.h> |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 32 | #include <net/sock.h> |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 33 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <net/pkt_sched.h> |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, |
| 37 | struct Qdisc *old, struct Qdisc *new); |
| 38 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 39 | struct Qdisc *q, unsigned long cl, int event); |
| 40 | |
| 41 | /* |
| 42 | |
| 43 | Short review. |
| 44 | ------------- |
| 45 | |
| 46 | This file consists of two interrelated parts: |
| 47 | |
| 48 | 1. queueing disciplines manager frontend. |
| 49 | 2. traffic classes manager frontend. |
| 50 | |
| 51 | Generally, queueing discipline ("qdisc") is a black box, |
| 52 | which is able to enqueue packets and to dequeue them (when |
| 53 | device is ready to send something) in order and at times |
| 54 | determined by algorithm hidden in it. |
| 55 | |
| 56 | qdisc's are divided to two categories: |
| 57 | - "queues", which have no internal structure visible from outside. |
| 58 | - "schedulers", which split all the packets to "traffic classes", |
| 59 | using "packet classifiers" (look at cls_api.c) |
| 60 | |
| 61 | In turn, classes may have child qdiscs (as rule, queues) |
| 62 | attached to them etc. etc. etc. |
| 63 | |
| 64 | The goal of the routines in this file is to translate |
| 65 | information supplied by user in the form of handles |
| 66 | to more intelligible for kernel form, to make some sanity |
| 67 | checks and part of work, which is common to all qdiscs |
| 68 | and to provide rtnetlink notifications. |
| 69 | |
| 70 | All real intelligent work is done inside qdisc modules. |
| 71 | |
| 72 | |
| 73 | |
| 74 | Every discipline has two major routines: enqueue and dequeue. |
| 75 | |
| 76 | ---dequeue |
| 77 | |
| 78 | dequeue usually returns a skb to send. It is allowed to return NULL, |
| 79 | but it does not mean that queue is empty, it just means that |
| 80 | discipline does not want to send anything this time. |
| 81 | Queue is really empty if q->q.qlen == 0. |
| 82 | For complicated disciplines with multiple queues q->q is not |
| 83 | real packet queue, but however q->q.qlen must be valid. |
| 84 | |
| 85 | ---enqueue |
| 86 | |
| 87 | enqueue returns 0, if packet was enqueued successfully. |
| 88 | If packet (this one or another one) was dropped, it returns |
| 89 | not zero error code. |
| 90 | NET_XMIT_DROP - this packet dropped |
| 91 | Expected action: do not backoff, but wait until queue will clear. |
| 92 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. |
| 93 | Expected action: backoff or ignore |
| 94 | NET_XMIT_POLICED - dropped by police. |
| 95 | Expected action: backoff or error to real-time apps. |
| 96 | |
| 97 | Auxiliary routines: |
| 98 | |
| 99 | ---requeue |
| 100 | |
| 101 | requeues once dequeued packet. It is used for non-standard or |
David S. Miller | e65d22e | 2008-07-08 16:46:01 -0700 | [diff] [blame] | 102 | just buggy devices, which can defer output even if netif_queue_stopped()=0. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | ---reset |
| 105 | |
| 106 | returns qdisc to initial state: purge all buffers, clear all |
| 107 | timers, counters (except for statistics) etc. |
| 108 | |
| 109 | ---init |
| 110 | |
| 111 | initializes newly created qdisc. |
| 112 | |
| 113 | ---destroy |
| 114 | |
| 115 | destroys resources allocated by init and during lifetime of qdisc. |
| 116 | |
| 117 | ---change |
| 118 | |
| 119 | changes qdisc parameters. |
| 120 | */ |
| 121 | |
| 122 | /* Protects list of registered TC modules. It is pure SMP lock. */ |
| 123 | static DEFINE_RWLOCK(qdisc_mod_lock); |
| 124 | |
| 125 | |
| 126 | /************************************************ |
| 127 | * Queueing disciplines manipulation. * |
| 128 | ************************************************/ |
| 129 | |
| 130 | |
| 131 | /* The list of all installed queueing disciplines. */ |
| 132 | |
| 133 | static struct Qdisc_ops *qdisc_base; |
| 134 | |
| 135 | /* Register/uregister queueing discipline */ |
| 136 | |
| 137 | int register_qdisc(struct Qdisc_ops *qops) |
| 138 | { |
| 139 | struct Qdisc_ops *q, **qp; |
| 140 | int rc = -EEXIST; |
| 141 | |
| 142 | write_lock(&qdisc_mod_lock); |
| 143 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
| 144 | if (!strcmp(qops->id, q->id)) |
| 145 | goto out; |
| 146 | |
| 147 | if (qops->enqueue == NULL) |
| 148 | qops->enqueue = noop_qdisc_ops.enqueue; |
| 149 | if (qops->requeue == NULL) |
| 150 | qops->requeue = noop_qdisc_ops.requeue; |
| 151 | if (qops->dequeue == NULL) |
| 152 | qops->dequeue = noop_qdisc_ops.dequeue; |
| 153 | |
| 154 | qops->next = NULL; |
| 155 | *qp = qops; |
| 156 | rc = 0; |
| 157 | out: |
| 158 | write_unlock(&qdisc_mod_lock); |
| 159 | return rc; |
| 160 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 161 | EXPORT_SYMBOL(register_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | int unregister_qdisc(struct Qdisc_ops *qops) |
| 164 | { |
| 165 | struct Qdisc_ops *q, **qp; |
| 166 | int err = -ENOENT; |
| 167 | |
| 168 | write_lock(&qdisc_mod_lock); |
| 169 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) |
| 170 | if (q == qops) |
| 171 | break; |
| 172 | if (q) { |
| 173 | *qp = q->next; |
| 174 | q->next = NULL; |
| 175 | err = 0; |
| 176 | } |
| 177 | write_unlock(&qdisc_mod_lock); |
| 178 | return err; |
| 179 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 180 | EXPORT_SYMBOL(unregister_qdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | /* We know handle. Find qdisc among all qdisc's attached to device |
| 183 | (root qdisc, all its children, children of children etc.) |
| 184 | */ |
| 185 | |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 186 | struct Qdisc *qdisc_match_from_root(struct Qdisc *root, u32 handle) |
| 187 | { |
| 188 | struct Qdisc *q; |
| 189 | |
| 190 | if (!(root->flags & TCQ_F_BUILTIN) && |
| 191 | root->handle == handle) |
| 192 | return root; |
| 193 | |
| 194 | list_for_each_entry(q, &root->list, list) { |
| 195 | if (q->handle == handle) |
| 196 | return q; |
| 197 | } |
| 198 | return NULL; |
| 199 | } |
| 200 | |
David S. Miller | ead81cc | 2008-07-17 00:50:32 -0700 | [diff] [blame] | 201 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 202 | { |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 203 | unsigned int i; |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 204 | |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 205 | for (i = 0; i < dev->num_tx_queues; i++) { |
| 206 | struct netdev_queue *txq = netdev_get_tx_queue(dev, i); |
David S. Miller | 827ebd6 | 2008-08-07 20:26:40 -0700 | [diff] [blame] | 207 | struct Qdisc *q, *txq_root = txq->qdisc_sleeping; |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 208 | |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 209 | q = qdisc_match_from_root(txq_root, handle); |
| 210 | if (q) |
| 211 | return q; |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 212 | } |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 213 | return qdisc_match_from_root(dev->rx_queue.qdisc_sleeping, handle); |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 214 | } |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) |
| 217 | { |
| 218 | unsigned long cl; |
| 219 | struct Qdisc *leaf; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 220 | const struct Qdisc_class_ops *cops = p->ops->cl_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
| 222 | if (cops == NULL) |
| 223 | return NULL; |
| 224 | cl = cops->get(p, classid); |
| 225 | |
| 226 | if (cl == 0) |
| 227 | return NULL; |
| 228 | leaf = cops->leaf(p, cl); |
| 229 | cops->put(p, cl); |
| 230 | return leaf; |
| 231 | } |
| 232 | |
| 233 | /* Find queueing discipline by name */ |
| 234 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 235 | static struct Qdisc_ops *qdisc_lookup_ops(struct nlattr *kind) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | { |
| 237 | struct Qdisc_ops *q = NULL; |
| 238 | |
| 239 | if (kind) { |
| 240 | read_lock(&qdisc_mod_lock); |
| 241 | for (q = qdisc_base; q; q = q->next) { |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 242 | if (nla_strcmp(kind, q->id) == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | if (!try_module_get(q->owner)) |
| 244 | q = NULL; |
| 245 | break; |
| 246 | } |
| 247 | } |
| 248 | read_unlock(&qdisc_mod_lock); |
| 249 | } |
| 250 | return q; |
| 251 | } |
| 252 | |
| 253 | static struct qdisc_rate_table *qdisc_rtab_list; |
| 254 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 255 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct nlattr *tab) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
| 257 | struct qdisc_rate_table *rtab; |
| 258 | |
| 259 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
| 260 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { |
| 261 | rtab->refcnt++; |
| 262 | return rtab; |
| 263 | } |
| 264 | } |
| 265 | |
Patrick McHardy | 5feb5e1 | 2008-01-23 20:35:19 -0800 | [diff] [blame] | 266 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || |
| 267 | nla_len(tab) != TC_RTAB_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | return NULL; |
| 269 | |
| 270 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
| 271 | if (rtab) { |
| 272 | rtab->rate = *r; |
| 273 | rtab->refcnt = 1; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 274 | memcpy(rtab->data, nla_data(tab), 1024); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | rtab->next = qdisc_rtab_list; |
| 276 | qdisc_rtab_list = rtab; |
| 277 | } |
| 278 | return rtab; |
| 279 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 280 | EXPORT_SYMBOL(qdisc_get_rtab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
| 282 | void qdisc_put_rtab(struct qdisc_rate_table *tab) |
| 283 | { |
| 284 | struct qdisc_rate_table *rtab, **rtabp; |
| 285 | |
| 286 | if (!tab || --tab->refcnt) |
| 287 | return; |
| 288 | |
| 289 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { |
| 290 | if (rtab == tab) { |
| 291 | *rtabp = rtab->next; |
| 292 | kfree(rtab); |
| 293 | return; |
| 294 | } |
| 295 | } |
| 296 | } |
Patrick McHardy | 62e3ba1 | 2008-01-22 22:10:23 -0800 | [diff] [blame] | 297 | EXPORT_SYMBOL(qdisc_put_rtab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 299 | static LIST_HEAD(qdisc_stab_list); |
| 300 | static DEFINE_SPINLOCK(qdisc_stab_lock); |
| 301 | |
| 302 | static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { |
| 303 | [TCA_STAB_BASE] = { .len = sizeof(struct tc_sizespec) }, |
| 304 | [TCA_STAB_DATA] = { .type = NLA_BINARY }, |
| 305 | }; |
| 306 | |
| 307 | static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) |
| 308 | { |
| 309 | struct nlattr *tb[TCA_STAB_MAX + 1]; |
| 310 | struct qdisc_size_table *stab; |
| 311 | struct tc_sizespec *s; |
| 312 | unsigned int tsize = 0; |
| 313 | u16 *tab = NULL; |
| 314 | int err; |
| 315 | |
| 316 | err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy); |
| 317 | if (err < 0) |
| 318 | return ERR_PTR(err); |
| 319 | if (!tb[TCA_STAB_BASE]) |
| 320 | return ERR_PTR(-EINVAL); |
| 321 | |
| 322 | s = nla_data(tb[TCA_STAB_BASE]); |
| 323 | |
| 324 | if (s->tsize > 0) { |
| 325 | if (!tb[TCA_STAB_DATA]) |
| 326 | return ERR_PTR(-EINVAL); |
| 327 | tab = nla_data(tb[TCA_STAB_DATA]); |
| 328 | tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); |
| 329 | } |
| 330 | |
| 331 | if (!s || tsize != s->tsize || (!tab && tsize > 0)) |
| 332 | return ERR_PTR(-EINVAL); |
| 333 | |
Jarek Poplawski | 1cfa266 | 2008-08-11 18:11:06 -0700 | [diff] [blame] | 334 | spin_lock_bh(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 335 | |
| 336 | list_for_each_entry(stab, &qdisc_stab_list, list) { |
| 337 | if (memcmp(&stab->szopts, s, sizeof(*s))) |
| 338 | continue; |
| 339 | if (tsize > 0 && memcmp(stab->data, tab, tsize * sizeof(u16))) |
| 340 | continue; |
| 341 | stab->refcnt++; |
Jarek Poplawski | 1cfa266 | 2008-08-11 18:11:06 -0700 | [diff] [blame] | 342 | spin_unlock_bh(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 343 | return stab; |
| 344 | } |
| 345 | |
Jarek Poplawski | 1cfa266 | 2008-08-11 18:11:06 -0700 | [diff] [blame] | 346 | spin_unlock_bh(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 347 | |
| 348 | stab = kmalloc(sizeof(*stab) + tsize * sizeof(u16), GFP_KERNEL); |
| 349 | if (!stab) |
| 350 | return ERR_PTR(-ENOMEM); |
| 351 | |
| 352 | stab->refcnt = 1; |
| 353 | stab->szopts = *s; |
| 354 | if (tsize > 0) |
| 355 | memcpy(stab->data, tab, tsize * sizeof(u16)); |
| 356 | |
Jarek Poplawski | 1cfa266 | 2008-08-11 18:11:06 -0700 | [diff] [blame] | 357 | spin_lock_bh(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 358 | list_add_tail(&stab->list, &qdisc_stab_list); |
Jarek Poplawski | 1cfa266 | 2008-08-11 18:11:06 -0700 | [diff] [blame] | 359 | spin_unlock_bh(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 360 | |
| 361 | return stab; |
| 362 | } |
| 363 | |
| 364 | void qdisc_put_stab(struct qdisc_size_table *tab) |
| 365 | { |
| 366 | if (!tab) |
| 367 | return; |
| 368 | |
Jarek Poplawski | 1cfa266 | 2008-08-11 18:11:06 -0700 | [diff] [blame] | 369 | spin_lock_bh(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 370 | |
| 371 | if (--tab->refcnt == 0) { |
| 372 | list_del(&tab->list); |
| 373 | kfree(tab); |
| 374 | } |
| 375 | |
Jarek Poplawski | 1cfa266 | 2008-08-11 18:11:06 -0700 | [diff] [blame] | 376 | spin_unlock_bh(&qdisc_stab_lock); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 377 | } |
| 378 | EXPORT_SYMBOL(qdisc_put_stab); |
| 379 | |
| 380 | static int qdisc_dump_stab(struct sk_buff *skb, struct qdisc_size_table *stab) |
| 381 | { |
| 382 | struct nlattr *nest; |
| 383 | |
| 384 | nest = nla_nest_start(skb, TCA_STAB); |
| 385 | NLA_PUT(skb, TCA_STAB_BASE, sizeof(stab->szopts), &stab->szopts); |
| 386 | nla_nest_end(skb, nest); |
| 387 | |
| 388 | return skb->len; |
| 389 | |
| 390 | nla_put_failure: |
| 391 | return -1; |
| 392 | } |
| 393 | |
| 394 | void qdisc_calculate_pkt_len(struct sk_buff *skb, struct qdisc_size_table *stab) |
| 395 | { |
| 396 | int pkt_len, slot; |
| 397 | |
| 398 | pkt_len = skb->len + stab->szopts.overhead; |
| 399 | if (unlikely(!stab->szopts.tsize)) |
| 400 | goto out; |
| 401 | |
| 402 | slot = pkt_len + stab->szopts.cell_align; |
| 403 | if (unlikely(slot < 0)) |
| 404 | slot = 0; |
| 405 | |
| 406 | slot >>= stab->szopts.cell_log; |
| 407 | if (likely(slot < stab->szopts.tsize)) |
| 408 | pkt_len = stab->data[slot]; |
| 409 | else |
| 410 | pkt_len = stab->data[stab->szopts.tsize - 1] * |
| 411 | (slot / stab->szopts.tsize) + |
| 412 | stab->data[slot % stab->szopts.tsize]; |
| 413 | |
| 414 | pkt_len <<= stab->szopts.size_log; |
| 415 | out: |
| 416 | if (unlikely(pkt_len < 1)) |
| 417 | pkt_len = 1; |
| 418 | qdisc_skb_cb(skb)->pkt_len = pkt_len; |
| 419 | } |
| 420 | EXPORT_SYMBOL(qdisc_calculate_pkt_len); |
| 421 | |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 422 | static enum hrtimer_restart qdisc_watchdog(struct hrtimer *timer) |
| 423 | { |
| 424 | struct qdisc_watchdog *wd = container_of(timer, struct qdisc_watchdog, |
| 425 | timer); |
| 426 | |
| 427 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; |
Stephen Hemminger | 11274e5 | 2007-03-22 12:17:42 -0700 | [diff] [blame] | 428 | smp_wmb(); |
David S. Miller | 37437bb | 2008-07-16 02:15:04 -0700 | [diff] [blame] | 429 | __netif_schedule(wd->qdisc); |
Stephen Hemminger | 1936502 | 2007-03-22 12:18:35 -0700 | [diff] [blame] | 430 | |
Patrick McHardy | 4179477 | 2007-03-16 01:19:15 -0700 | [diff] [blame] | 431 | return HRTIMER_NORESTART; |
| 432 | } |
| 433 | |
| 434 | void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc) |
| 435 | { |
| 436 | hrtimer_init(&wd->timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS); |
| 437 | wd->timer.function = qdisc_watchdog; |
| 438 | wd->qdisc = qdisc; |
| 439 | } |
| 440 | EXPORT_SYMBOL(qdisc_watchdog_init); |
| 441 | |
| 442 | void qdisc_watchdog_schedule(struct qdisc_watchdog *wd, psched_time_t expires) |
| 443 | { |
| 444 | ktime_t time; |
| 445 | |
| 446 | wd->qdisc->flags |= TCQ_F_THROTTLED; |
| 447 | time = ktime_set(0, 0); |
| 448 | time = ktime_add_ns(time, PSCHED_US2NS(expires)); |
| 449 | hrtimer_start(&wd->timer, time, HRTIMER_MODE_ABS); |
| 450 | } |
| 451 | EXPORT_SYMBOL(qdisc_watchdog_schedule); |
| 452 | |
| 453 | void qdisc_watchdog_cancel(struct qdisc_watchdog *wd) |
| 454 | { |
| 455 | hrtimer_cancel(&wd->timer); |
| 456 | wd->qdisc->flags &= ~TCQ_F_THROTTLED; |
| 457 | } |
| 458 | EXPORT_SYMBOL(qdisc_watchdog_cancel); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Adrian Bunk | a94f779 | 2008-07-22 14:20:11 -0700 | [diff] [blame] | 460 | static struct hlist_head *qdisc_class_hash_alloc(unsigned int n) |
Patrick McHardy | 6fe1c7a | 2008-07-05 23:21:31 -0700 | [diff] [blame] | 461 | { |
| 462 | unsigned int size = n * sizeof(struct hlist_head), i; |
| 463 | struct hlist_head *h; |
| 464 | |
| 465 | if (size <= PAGE_SIZE) |
| 466 | h = kmalloc(size, GFP_KERNEL); |
| 467 | else |
| 468 | h = (struct hlist_head *) |
| 469 | __get_free_pages(GFP_KERNEL, get_order(size)); |
| 470 | |
| 471 | if (h != NULL) { |
| 472 | for (i = 0; i < n; i++) |
| 473 | INIT_HLIST_HEAD(&h[i]); |
| 474 | } |
| 475 | return h; |
| 476 | } |
| 477 | |
| 478 | static void qdisc_class_hash_free(struct hlist_head *h, unsigned int n) |
| 479 | { |
| 480 | unsigned int size = n * sizeof(struct hlist_head); |
| 481 | |
| 482 | if (size <= PAGE_SIZE) |
| 483 | kfree(h); |
| 484 | else |
| 485 | free_pages((unsigned long)h, get_order(size)); |
| 486 | } |
| 487 | |
| 488 | void qdisc_class_hash_grow(struct Qdisc *sch, struct Qdisc_class_hash *clhash) |
| 489 | { |
| 490 | struct Qdisc_class_common *cl; |
| 491 | struct hlist_node *n, *next; |
| 492 | struct hlist_head *nhash, *ohash; |
| 493 | unsigned int nsize, nmask, osize; |
| 494 | unsigned int i, h; |
| 495 | |
| 496 | /* Rehash when load factor exceeds 0.75 */ |
| 497 | if (clhash->hashelems * 4 <= clhash->hashsize * 3) |
| 498 | return; |
| 499 | nsize = clhash->hashsize * 2; |
| 500 | nmask = nsize - 1; |
| 501 | nhash = qdisc_class_hash_alloc(nsize); |
| 502 | if (nhash == NULL) |
| 503 | return; |
| 504 | |
| 505 | ohash = clhash->hash; |
| 506 | osize = clhash->hashsize; |
| 507 | |
| 508 | sch_tree_lock(sch); |
| 509 | for (i = 0; i < osize; i++) { |
| 510 | hlist_for_each_entry_safe(cl, n, next, &ohash[i], hnode) { |
| 511 | h = qdisc_class_hash(cl->classid, nmask); |
| 512 | hlist_add_head(&cl->hnode, &nhash[h]); |
| 513 | } |
| 514 | } |
| 515 | clhash->hash = nhash; |
| 516 | clhash->hashsize = nsize; |
| 517 | clhash->hashmask = nmask; |
| 518 | sch_tree_unlock(sch); |
| 519 | |
| 520 | qdisc_class_hash_free(ohash, osize); |
| 521 | } |
| 522 | EXPORT_SYMBOL(qdisc_class_hash_grow); |
| 523 | |
| 524 | int qdisc_class_hash_init(struct Qdisc_class_hash *clhash) |
| 525 | { |
| 526 | unsigned int size = 4; |
| 527 | |
| 528 | clhash->hash = qdisc_class_hash_alloc(size); |
| 529 | if (clhash->hash == NULL) |
| 530 | return -ENOMEM; |
| 531 | clhash->hashsize = size; |
| 532 | clhash->hashmask = size - 1; |
| 533 | clhash->hashelems = 0; |
| 534 | return 0; |
| 535 | } |
| 536 | EXPORT_SYMBOL(qdisc_class_hash_init); |
| 537 | |
| 538 | void qdisc_class_hash_destroy(struct Qdisc_class_hash *clhash) |
| 539 | { |
| 540 | qdisc_class_hash_free(clhash->hash, clhash->hashsize); |
| 541 | } |
| 542 | EXPORT_SYMBOL(qdisc_class_hash_destroy); |
| 543 | |
| 544 | void qdisc_class_hash_insert(struct Qdisc_class_hash *clhash, |
| 545 | struct Qdisc_class_common *cl) |
| 546 | { |
| 547 | unsigned int h; |
| 548 | |
| 549 | INIT_HLIST_NODE(&cl->hnode); |
| 550 | h = qdisc_class_hash(cl->classid, clhash->hashmask); |
| 551 | hlist_add_head(&cl->hnode, &clhash->hash[h]); |
| 552 | clhash->hashelems++; |
| 553 | } |
| 554 | EXPORT_SYMBOL(qdisc_class_hash_insert); |
| 555 | |
| 556 | void qdisc_class_hash_remove(struct Qdisc_class_hash *clhash, |
| 557 | struct Qdisc_class_common *cl) |
| 558 | { |
| 559 | hlist_del(&cl->hnode); |
| 560 | clhash->hashelems--; |
| 561 | } |
| 562 | EXPORT_SYMBOL(qdisc_class_hash_remove); |
| 563 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | /* Allocate an unique handle from space managed by kernel */ |
| 565 | |
| 566 | static u32 qdisc_alloc_handle(struct net_device *dev) |
| 567 | { |
| 568 | int i = 0x10000; |
| 569 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
| 570 | |
| 571 | do { |
| 572 | autohandle += TC_H_MAKE(0x10000U, 0); |
| 573 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) |
| 574 | autohandle = TC_H_MAKE(0x80000000U, 0); |
| 575 | } while (qdisc_lookup(dev, autohandle) && --i > 0); |
| 576 | |
| 577 | return i>0 ? autohandle : 0; |
| 578 | } |
| 579 | |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 580 | /* Attach toplevel qdisc to device queue. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 582 | static struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue, |
| 583 | struct Qdisc *qdisc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | { |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 585 | struct Qdisc *oqdisc = dev_queue->qdisc_sleeping; |
David S. Miller | 5304997 | 2008-07-16 03:00:19 -0700 | [diff] [blame] | 586 | spinlock_t *root_lock; |
David S. Miller | 5304997 | 2008-07-16 03:00:19 -0700 | [diff] [blame] | 587 | |
| 588 | root_lock = qdisc_root_lock(oqdisc); |
| 589 | spin_lock_bh(root_lock); |
| 590 | |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 591 | /* Prune old scheduler */ |
| 592 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) |
| 593 | qdisc_reset(oqdisc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 595 | /* ... and graft new one */ |
| 596 | if (qdisc == NULL) |
| 597 | qdisc = &noop_qdisc; |
| 598 | dev_queue->qdisc_sleeping = qdisc; |
| 599 | dev_queue->qdisc = &noop_qdisc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
David S. Miller | 5304997 | 2008-07-16 03:00:19 -0700 | [diff] [blame] | 601 | spin_unlock_bh(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | return oqdisc; |
| 604 | } |
| 605 | |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 606 | void qdisc_tree_decrease_qlen(struct Qdisc *sch, unsigned int n) |
| 607 | { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 608 | const struct Qdisc_class_ops *cops; |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 609 | unsigned long cl; |
| 610 | u32 parentid; |
| 611 | |
| 612 | if (n == 0) |
| 613 | return; |
| 614 | while ((parentid = sch->parent)) { |
Jarek Poplawski | 066a3b5 | 2008-04-14 15:10:42 -0700 | [diff] [blame] | 615 | if (TC_H_MAJ(parentid) == TC_H_MAJ(TC_H_INGRESS)) |
| 616 | return; |
| 617 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 618 | sch = qdisc_lookup(qdisc_dev(sch), TC_H_MAJ(parentid)); |
Patrick McHardy | ffc8fef | 2007-07-30 17:11:50 -0700 | [diff] [blame] | 619 | if (sch == NULL) { |
| 620 | WARN_ON(parentid != TC_H_ROOT); |
| 621 | return; |
| 622 | } |
Patrick McHardy | 43effa1 | 2006-11-29 17:35:48 -0800 | [diff] [blame] | 623 | cops = sch->ops->cl_ops; |
| 624 | if (cops->qlen_notify) { |
| 625 | cl = cops->get(sch, parentid); |
| 626 | cops->qlen_notify(sch, cl); |
| 627 | cops->put(sch, cl); |
| 628 | } |
| 629 | sch->q.qlen -= n; |
| 630 | } |
| 631 | } |
| 632 | EXPORT_SYMBOL(qdisc_tree_decrease_qlen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 634 | static void notify_and_destroy(struct sk_buff *skb, struct nlmsghdr *n, u32 clid, |
| 635 | struct Qdisc *old, struct Qdisc *new) |
| 636 | { |
| 637 | if (new || old) |
| 638 | qdisc_notify(skb, n, clid, old, new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 640 | if (old) { |
| 641 | spin_lock_bh(&old->q.lock); |
| 642 | qdisc_destroy(old); |
| 643 | spin_unlock_bh(&old->q.lock); |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or |
| 648 | * to device "dev". |
| 649 | * |
| 650 | * When appropriate send a netlink notification using 'skb' |
| 651 | * and "n". |
| 652 | * |
| 653 | * On success, destroy old qdisc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | */ |
| 655 | |
| 656 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 657 | struct sk_buff *skb, struct nlmsghdr *n, u32 classid, |
| 658 | struct Qdisc *new, struct Qdisc *old) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | { |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 660 | struct Qdisc *q = old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 663 | if (parent == NULL) { |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 664 | unsigned int i, num_q, ingress; |
| 665 | |
| 666 | ingress = 0; |
| 667 | num_q = dev->num_tx_queues; |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 668 | if ((q && q->flags & TCQ_F_INGRESS) || |
| 669 | (new && new->flags & TCQ_F_INGRESS)) { |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 670 | num_q = 1; |
| 671 | ingress = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | } |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 673 | |
| 674 | if (dev->flags & IFF_UP) |
| 675 | dev_deactivate(dev); |
| 676 | |
| 677 | for (i = 0; i < num_q; i++) { |
| 678 | struct netdev_queue *dev_queue = &dev->rx_queue; |
| 679 | |
| 680 | if (!ingress) |
| 681 | dev_queue = netdev_get_tx_queue(dev, i); |
| 682 | |
David S. Miller | 8d50b53 | 2008-07-30 02:37:46 -0700 | [diff] [blame] | 683 | old = dev_graft_qdisc(dev_queue, new); |
| 684 | if (new && i > 0) |
| 685 | atomic_inc(&new->refcnt); |
| 686 | |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 687 | notify_and_destroy(skb, n, classid, old, new); |
| 688 | } |
| 689 | |
| 690 | if (dev->flags & IFF_UP) |
| 691 | dev_activate(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | } else { |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 693 | const struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | |
| 695 | err = -EINVAL; |
| 696 | |
| 697 | if (cops) { |
| 698 | unsigned long cl = cops->get(parent, classid); |
| 699 | if (cl) { |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 700 | err = cops->graft(parent, cl, new, &old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | cops->put(parent, cl); |
| 702 | } |
| 703 | } |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 704 | if (!err) |
| 705 | notify_and_destroy(skb, n, classid, old, new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
| 707 | return err; |
| 708 | } |
| 709 | |
| 710 | /* |
| 711 | Allocate and initialize new qdisc. |
| 712 | |
| 713 | Parameters are passed via opt. |
| 714 | */ |
| 715 | |
| 716 | static struct Qdisc * |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 717 | qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, |
| 718 | u32 parent, u32 handle, struct nlattr **tca, int *errp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | { |
| 720 | int err; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 721 | struct nlattr *kind = tca[TCA_KIND]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | struct Qdisc *sch; |
| 723 | struct Qdisc_ops *ops; |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 724 | struct qdisc_size_table *stab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
| 726 | ops = qdisc_lookup_ops(kind); |
| 727 | #ifdef CONFIG_KMOD |
| 728 | if (ops == NULL && kind != NULL) { |
| 729 | char name[IFNAMSIZ]; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 730 | if (nla_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | /* We dropped the RTNL semaphore in order to |
| 732 | * perform the module load. So, even if we |
| 733 | * succeeded in loading the module we have to |
| 734 | * tell the caller to replay the request. We |
| 735 | * indicate this using -EAGAIN. |
| 736 | * We replay the request because the device may |
| 737 | * go away in the mean time. |
| 738 | */ |
| 739 | rtnl_unlock(); |
| 740 | request_module("sch_%s", name); |
| 741 | rtnl_lock(); |
| 742 | ops = qdisc_lookup_ops(kind); |
| 743 | if (ops != NULL) { |
| 744 | /* We will try again qdisc_lookup_ops, |
| 745 | * so don't keep a reference. |
| 746 | */ |
| 747 | module_put(ops->owner); |
| 748 | err = -EAGAIN; |
| 749 | goto err_out; |
| 750 | } |
| 751 | } |
| 752 | } |
| 753 | #endif |
| 754 | |
Jamal Hadi Salim | b9e2cc0 | 2006-08-03 16:36:51 -0700 | [diff] [blame] | 755 | err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | if (ops == NULL) |
| 757 | goto err_out; |
| 758 | |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 759 | sch = qdisc_alloc(dev_queue, ops); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 760 | if (IS_ERR(sch)) { |
| 761 | err = PTR_ERR(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | goto err_out2; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 763 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Patrick McHardy | ffc8fef | 2007-07-30 17:11:50 -0700 | [diff] [blame] | 765 | sch->parent = parent; |
| 766 | |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 767 | if (handle == TC_H_INGRESS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | sch->flags |= TCQ_F_INGRESS; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 769 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
Patrick McHardy | fd44de7 | 2007-04-16 17:07:08 -0700 | [diff] [blame] | 770 | } else { |
Patrick McHardy | fd44de7 | 2007-04-16 17:07:08 -0700 | [diff] [blame] | 771 | if (handle == 0) { |
| 772 | handle = qdisc_alloc_handle(dev); |
| 773 | err = -ENOMEM; |
| 774 | if (handle == 0) |
| 775 | goto err_out3; |
| 776 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | } |
| 778 | |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 779 | sch->handle = handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 781 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS])) == 0) { |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 782 | if (tca[TCA_STAB]) { |
| 783 | stab = qdisc_get_stab(tca[TCA_STAB]); |
| 784 | if (IS_ERR(stab)) { |
| 785 | err = PTR_ERR(stab); |
| 786 | goto err_out3; |
| 787 | } |
| 788 | sch->stab = stab; |
| 789 | } |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 790 | if (tca[TCA_RATE]) { |
Thomas Graf | 023e09a | 2005-07-05 14:15:53 -0700 | [diff] [blame] | 791 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 792 | qdisc_root_lock(sch), |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 793 | tca[TCA_RATE]); |
Thomas Graf | 023e09a | 2005-07-05 14:15:53 -0700 | [diff] [blame] | 794 | if (err) { |
| 795 | /* |
| 796 | * Any broken qdiscs that would require |
| 797 | * a ops->reset() here? The qdisc was never |
| 798 | * in action so it shouldn't be necessary. |
| 799 | */ |
| 800 | if (ops->destroy) |
| 801 | ops->destroy(sch); |
| 802 | goto err_out3; |
| 803 | } |
| 804 | } |
David S. Miller | ee7af82 | 2008-08-06 23:35:59 -0700 | [diff] [blame] | 805 | if ((parent != TC_H_ROOT) && !(sch->flags & TCQ_F_INGRESS)) |
David S. Miller | 827ebd6 | 2008-08-07 20:26:40 -0700 | [diff] [blame] | 806 | list_add_tail(&sch->list, &dev_queue->qdisc_sleeping->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | return sch; |
| 809 | } |
| 810 | err_out3: |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 811 | qdisc_put_stab(sch->stab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | dev_put(dev); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 813 | kfree((char *) sch - sch->padded); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | err_out2: |
| 815 | module_put(ops->owner); |
| 816 | err_out: |
| 817 | *errp = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | return NULL; |
| 819 | } |
| 820 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 821 | static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | { |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 823 | struct qdisc_size_table *stab = NULL; |
| 824 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 826 | if (tca[TCA_OPTIONS]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | if (sch->ops->change == NULL) |
| 828 | return -EINVAL; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 829 | err = sch->ops->change(sch, tca[TCA_OPTIONS]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | if (err) |
| 831 | return err; |
| 832 | } |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 833 | |
| 834 | if (tca[TCA_STAB]) { |
| 835 | stab = qdisc_get_stab(tca[TCA_STAB]); |
| 836 | if (IS_ERR(stab)) |
| 837 | return PTR_ERR(stab); |
| 838 | } |
| 839 | |
| 840 | qdisc_put_stab(sch->stab); |
| 841 | sch->stab = stab; |
| 842 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 843 | if (tca[TCA_RATE]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 845 | qdisc_root_lock(sch), tca[TCA_RATE]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | return 0; |
| 847 | } |
| 848 | |
| 849 | struct check_loop_arg |
| 850 | { |
| 851 | struct qdisc_walker w; |
| 852 | struct Qdisc *p; |
| 853 | int depth; |
| 854 | }; |
| 855 | |
| 856 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); |
| 857 | |
| 858 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) |
| 859 | { |
| 860 | struct check_loop_arg arg; |
| 861 | |
| 862 | if (q->ops->cl_ops == NULL) |
| 863 | return 0; |
| 864 | |
| 865 | arg.w.stop = arg.w.skip = arg.w.count = 0; |
| 866 | arg.w.fn = check_loop_fn; |
| 867 | arg.depth = depth; |
| 868 | arg.p = p; |
| 869 | q->ops->cl_ops->walk(q, &arg.w); |
| 870 | return arg.w.stop ? -ELOOP : 0; |
| 871 | } |
| 872 | |
| 873 | static int |
| 874 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) |
| 875 | { |
| 876 | struct Qdisc *leaf; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 877 | const struct Qdisc_class_ops *cops = q->ops->cl_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
| 879 | |
| 880 | leaf = cops->leaf(q, cl); |
| 881 | if (leaf) { |
| 882 | if (leaf == arg->p || arg->depth > 7) |
| 883 | return -ELOOP; |
| 884 | return check_loop(leaf, arg->p, arg->depth + 1); |
| 885 | } |
| 886 | return 0; |
| 887 | } |
| 888 | |
| 889 | /* |
| 890 | * Delete/get qdisc. |
| 891 | */ |
| 892 | |
| 893 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 894 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 895 | struct net *net = sock_net(skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | struct tcmsg *tcm = NLMSG_DATA(n); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 897 | struct nlattr *tca[TCA_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | struct net_device *dev; |
| 899 | u32 clid = tcm->tcm_parent; |
| 900 | struct Qdisc *q = NULL; |
| 901 | struct Qdisc *p = NULL; |
| 902 | int err; |
| 903 | |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 904 | if (net != &init_net) |
| 905 | return -EINVAL; |
| 906 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 907 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | return -ENODEV; |
| 909 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 910 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 911 | if (err < 0) |
| 912 | return err; |
| 913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | if (clid) { |
| 915 | if (clid != TC_H_ROOT) { |
| 916 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { |
| 917 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) |
| 918 | return -ENOENT; |
| 919 | q = qdisc_leaf(p, clid); |
| 920 | } else { /* ingress */ |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 921 | q = dev->rx_queue.qdisc_sleeping; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 922 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | } else { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 924 | struct netdev_queue *dev_queue; |
| 925 | dev_queue = netdev_get_tx_queue(dev, 0); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 926 | q = dev_queue->qdisc_sleeping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | } |
| 928 | if (!q) |
| 929 | return -ENOENT; |
| 930 | |
| 931 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) |
| 932 | return -EINVAL; |
| 933 | } else { |
| 934 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) |
| 935 | return -ENOENT; |
| 936 | } |
| 937 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 938 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | return -EINVAL; |
| 940 | |
| 941 | if (n->nlmsg_type == RTM_DELQDISC) { |
| 942 | if (!clid) |
| 943 | return -EINVAL; |
| 944 | if (q->handle == 0) |
| 945 | return -ENOENT; |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 946 | if ((err = qdisc_graft(dev, p, skb, n, clid, NULL, q)) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | } else { |
| 949 | qdisc_notify(skb, n, clid, NULL, q); |
| 950 | } |
| 951 | return 0; |
| 952 | } |
| 953 | |
| 954 | /* |
| 955 | Create/change qdisc. |
| 956 | */ |
| 957 | |
| 958 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 959 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 960 | struct net *net = sock_net(skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | struct tcmsg *tcm; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 962 | struct nlattr *tca[TCA_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | struct net_device *dev; |
| 964 | u32 clid; |
| 965 | struct Qdisc *q, *p; |
| 966 | int err; |
| 967 | |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 968 | if (net != &init_net) |
| 969 | return -EINVAL; |
| 970 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 971 | replay: |
| 972 | /* Reinit, just in case something touches this. */ |
| 973 | tcm = NLMSG_DATA(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | clid = tcm->tcm_parent; |
| 975 | q = p = NULL; |
| 976 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 977 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 978 | return -ENODEV; |
| 979 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 980 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 981 | if (err < 0) |
| 982 | return err; |
| 983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | if (clid) { |
| 985 | if (clid != TC_H_ROOT) { |
| 986 | if (clid != TC_H_INGRESS) { |
| 987 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) |
| 988 | return -ENOENT; |
| 989 | q = qdisc_leaf(p, clid); |
| 990 | } else { /*ingress */ |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 991 | q = dev->rx_queue.qdisc_sleeping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | } |
| 993 | } else { |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 994 | struct netdev_queue *dev_queue; |
| 995 | dev_queue = netdev_get_tx_queue(dev, 0); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 996 | q = dev_queue->qdisc_sleeping; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | } |
| 998 | |
| 999 | /* It may be default qdisc, ignore it */ |
| 1000 | if (q && q->handle == 0) |
| 1001 | q = NULL; |
| 1002 | |
| 1003 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { |
| 1004 | if (tcm->tcm_handle) { |
| 1005 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) |
| 1006 | return -EEXIST; |
| 1007 | if (TC_H_MIN(tcm->tcm_handle)) |
| 1008 | return -EINVAL; |
| 1009 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) |
| 1010 | goto create_n_graft; |
| 1011 | if (n->nlmsg_flags&NLM_F_EXCL) |
| 1012 | return -EEXIST; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1013 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | return -EINVAL; |
| 1015 | if (q == p || |
| 1016 | (p && check_loop(q, p, 0))) |
| 1017 | return -ELOOP; |
| 1018 | atomic_inc(&q->refcnt); |
| 1019 | goto graft; |
| 1020 | } else { |
| 1021 | if (q == NULL) |
| 1022 | goto create_n_graft; |
| 1023 | |
| 1024 | /* This magic test requires explanation. |
| 1025 | * |
| 1026 | * We know, that some child q is already |
| 1027 | * attached to this parent and have choice: |
| 1028 | * either to change it or to create/graft new one. |
| 1029 | * |
| 1030 | * 1. We are allowed to create/graft only |
| 1031 | * if CREATE and REPLACE flags are set. |
| 1032 | * |
| 1033 | * 2. If EXCL is set, requestor wanted to say, |
| 1034 | * that qdisc tcm_handle is not expected |
| 1035 | * to exist, so that we choose create/graft too. |
| 1036 | * |
| 1037 | * 3. The last case is when no flags are set. |
| 1038 | * Alas, it is sort of hole in API, we |
| 1039 | * cannot decide what to do unambiguously. |
| 1040 | * For now we select create/graft, if |
| 1041 | * user gave KIND, which does not match existing. |
| 1042 | */ |
| 1043 | if ((n->nlmsg_flags&NLM_F_CREATE) && |
| 1044 | (n->nlmsg_flags&NLM_F_REPLACE) && |
| 1045 | ((n->nlmsg_flags&NLM_F_EXCL) || |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1046 | (tca[TCA_KIND] && |
| 1047 | nla_strcmp(tca[TCA_KIND], q->ops->id)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | goto create_n_graft; |
| 1049 | } |
| 1050 | } |
| 1051 | } else { |
| 1052 | if (!tcm->tcm_handle) |
| 1053 | return -EINVAL; |
| 1054 | q = qdisc_lookup(dev, tcm->tcm_handle); |
| 1055 | } |
| 1056 | |
| 1057 | /* Change qdisc parameters */ |
| 1058 | if (q == NULL) |
| 1059 | return -ENOENT; |
| 1060 | if (n->nlmsg_flags&NLM_F_EXCL) |
| 1061 | return -EEXIST; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1062 | if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | return -EINVAL; |
| 1064 | err = qdisc_change(q, tca); |
| 1065 | if (err == 0) |
| 1066 | qdisc_notify(skb, n, clid, NULL, q); |
| 1067 | return err; |
| 1068 | |
| 1069 | create_n_graft: |
| 1070 | if (!(n->nlmsg_flags&NLM_F_CREATE)) |
| 1071 | return -ENOENT; |
| 1072 | if (clid == TC_H_INGRESS) |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 1073 | q = qdisc_create(dev, &dev->rx_queue, |
| 1074 | tcm->tcm_parent, tcm->tcm_parent, |
Patrick McHardy | ffc8fef | 2007-07-30 17:11:50 -0700 | [diff] [blame] | 1075 | tca, &err); |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1076 | else |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 1077 | q = qdisc_create(dev, netdev_get_tx_queue(dev, 0), |
David S. Miller | bb949fb | 2008-07-08 16:55:56 -0700 | [diff] [blame] | 1078 | tcm->tcm_parent, tcm->tcm_handle, |
Patrick McHardy | ffc8fef | 2007-07-30 17:11:50 -0700 | [diff] [blame] | 1079 | tca, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | if (q == NULL) { |
| 1081 | if (err == -EAGAIN) |
| 1082 | goto replay; |
| 1083 | return err; |
| 1084 | } |
| 1085 | |
| 1086 | graft: |
| 1087 | if (1) { |
David S. Miller | 5304997 | 2008-07-16 03:00:19 -0700 | [diff] [blame] | 1088 | spinlock_t *root_lock; |
| 1089 | |
David S. Miller | 99194cf | 2008-07-17 04:54:10 -0700 | [diff] [blame] | 1090 | err = qdisc_graft(dev, p, skb, n, clid, q, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | if (err) { |
| 1092 | if (q) { |
David S. Miller | 5304997 | 2008-07-16 03:00:19 -0700 | [diff] [blame] | 1093 | root_lock = qdisc_root_lock(q); |
| 1094 | spin_lock_bh(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | qdisc_destroy(q); |
David S. Miller | 5304997 | 2008-07-16 03:00:19 -0700 | [diff] [blame] | 1096 | spin_unlock_bh(root_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | } |
| 1098 | return err; |
| 1099 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | } |
| 1101 | return 0; |
| 1102 | } |
| 1103 | |
| 1104 | static int tc_fill_qdisc(struct sk_buff *skb, struct Qdisc *q, u32 clid, |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 1105 | u32 pid, u32 seq, u16 flags, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | { |
| 1107 | struct tcmsg *tcm; |
| 1108 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1109 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | struct gnet_dump d; |
| 1111 | |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 1112 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | tcm = NLMSG_DATA(nlh); |
| 1114 | tcm->tcm_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1115 | tcm->tcm__pad1 = 0; |
| 1116 | tcm->tcm__pad2 = 0; |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 1117 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | tcm->tcm_parent = clid; |
| 1119 | tcm->tcm_handle = q->handle; |
| 1120 | tcm->tcm_info = atomic_read(&q->refcnt); |
Patrick McHardy | 57e1c48 | 2008-01-23 20:34:28 -0800 | [diff] [blame] | 1121 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1123 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1124 | q->qstats.qlen = q->q.qlen; |
| 1125 | |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 1126 | if (q->stab && qdisc_dump_stab(skb, q->stab) < 0) |
| 1127 | goto nla_put_failure; |
| 1128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 1130 | TCA_XSTATS, qdisc_root_lock(q), &d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1131 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | |
| 1133 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1134 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | |
| 1136 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1139 | goto nla_put_failure; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | if (gnet_stats_finish_copy(&d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1142 | goto nla_put_failure; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1143 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1144 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | return skb->len; |
| 1146 | |
| 1147 | nlmsg_failure: |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1148 | nla_put_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 1149 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | return -1; |
| 1151 | } |
| 1152 | |
| 1153 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 1154 | u32 clid, struct Qdisc *old, struct Qdisc *new) |
| 1155 | { |
| 1156 | struct sk_buff *skb; |
| 1157 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; |
| 1158 | |
| 1159 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1160 | if (!skb) |
| 1161 | return -ENOBUFS; |
| 1162 | |
| 1163 | if (old && old->handle) { |
| 1164 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) |
| 1165 | goto err_out; |
| 1166 | } |
| 1167 | if (new) { |
| 1168 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
| 1169 | goto err_out; |
| 1170 | } |
| 1171 | |
| 1172 | if (skb->len) |
Denis V. Lunev | 97c53ca | 2007-11-19 22:26:51 -0800 | [diff] [blame] | 1173 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | |
| 1175 | err_out: |
| 1176 | kfree_skb(skb); |
| 1177 | return -EINVAL; |
| 1178 | } |
| 1179 | |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1180 | static bool tc_qdisc_dump_ignore(struct Qdisc *q) |
| 1181 | { |
| 1182 | return (q->flags & TCQ_F_BUILTIN) ? true : false; |
| 1183 | } |
| 1184 | |
| 1185 | static int tc_dump_qdisc_root(struct Qdisc *root, struct sk_buff *skb, |
| 1186 | struct netlink_callback *cb, |
| 1187 | int *q_idx_p, int s_q_idx) |
| 1188 | { |
| 1189 | int ret = 0, q_idx = *q_idx_p; |
| 1190 | struct Qdisc *q; |
| 1191 | |
| 1192 | if (!root) |
| 1193 | return 0; |
| 1194 | |
| 1195 | q = root; |
| 1196 | if (q_idx < s_q_idx) { |
| 1197 | q_idx++; |
| 1198 | } else { |
| 1199 | if (!tc_qdisc_dump_ignore(q) && |
| 1200 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, |
| 1201 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
| 1202 | goto done; |
| 1203 | q_idx++; |
| 1204 | } |
| 1205 | list_for_each_entry(q, &root->list, list) { |
| 1206 | if (q_idx < s_q_idx) { |
| 1207 | q_idx++; |
| 1208 | continue; |
| 1209 | } |
| 1210 | if (!tc_qdisc_dump_ignore(q) && |
| 1211 | tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, |
| 1212 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) |
| 1213 | goto done; |
| 1214 | q_idx++; |
| 1215 | } |
| 1216 | |
| 1217 | out: |
| 1218 | *q_idx_p = q_idx; |
| 1219 | return ret; |
| 1220 | done: |
| 1221 | ret = -1; |
| 1222 | goto out; |
| 1223 | } |
| 1224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
| 1226 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1227 | struct net *net = sock_net(skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | int idx, q_idx; |
| 1229 | int s_idx, s_q_idx; |
| 1230 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 1232 | if (net != &init_net) |
| 1233 | return 0; |
| 1234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | s_idx = cb->args[0]; |
| 1236 | s_q_idx = q_idx = cb->args[1]; |
| 1237 | read_lock(&dev_base_lock); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 1238 | idx = 0; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1239 | for_each_netdev(&init_net, dev) { |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1240 | struct netdev_queue *dev_queue; |
| 1241 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | if (idx < s_idx) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 1243 | goto cont; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | if (idx > s_idx) |
| 1245 | s_q_idx = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | q_idx = 0; |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1247 | |
| 1248 | dev_queue = netdev_get_tx_queue(dev, 0); |
David S. Miller | 827ebd6 | 2008-08-07 20:26:40 -0700 | [diff] [blame] | 1249 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1250 | goto done; |
| 1251 | |
| 1252 | dev_queue = &dev->rx_queue; |
David S. Miller | 827ebd6 | 2008-08-07 20:26:40 -0700 | [diff] [blame] | 1253 | if (tc_dump_qdisc_root(dev_queue->qdisc_sleeping, skb, cb, &q_idx, s_q_idx) < 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1254 | goto done; |
| 1255 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 1256 | cont: |
| 1257 | idx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | } |
| 1259 | |
| 1260 | done: |
| 1261 | read_unlock(&dev_base_lock); |
| 1262 | |
| 1263 | cb->args[0] = idx; |
| 1264 | cb->args[1] = q_idx; |
| 1265 | |
| 1266 | return skb->len; |
| 1267 | } |
| 1268 | |
| 1269 | |
| 1270 | |
| 1271 | /************************************************ |
| 1272 | * Traffic classes manipulation. * |
| 1273 | ************************************************/ |
| 1274 | |
| 1275 | |
| 1276 | |
| 1277 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 1278 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1279 | struct net *net = sock_net(skb->sk); |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 1280 | struct netdev_queue *dev_queue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | struct tcmsg *tcm = NLMSG_DATA(n); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1282 | struct nlattr *tca[TCA_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | struct net_device *dev; |
| 1284 | struct Qdisc *q = NULL; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1285 | const struct Qdisc_class_ops *cops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | unsigned long cl = 0; |
| 1287 | unsigned long new_cl; |
| 1288 | u32 pid = tcm->tcm_parent; |
| 1289 | u32 clid = tcm->tcm_handle; |
| 1290 | u32 qid = TC_H_MAJ(clid); |
| 1291 | int err; |
| 1292 | |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 1293 | if (net != &init_net) |
| 1294 | return -EINVAL; |
| 1295 | |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1296 | if ((dev = __dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | return -ENODEV; |
| 1298 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1299 | err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL); |
| 1300 | if (err < 0) |
| 1301 | return err; |
| 1302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | /* |
| 1304 | parent == TC_H_UNSPEC - unspecified parent. |
| 1305 | parent == TC_H_ROOT - class is root, which has no parent. |
| 1306 | parent == X:0 - parent is root class. |
| 1307 | parent == X:Y - parent is a node in hierarchy. |
| 1308 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. |
| 1309 | |
| 1310 | handle == 0:0 - generate handle from kernel pool. |
| 1311 | handle == 0:Y - class is X:Y, where X:0 is qdisc. |
| 1312 | handle == X:Y - clear. |
| 1313 | handle == X:0 - root class. |
| 1314 | */ |
| 1315 | |
| 1316 | /* Step 1. Determine qdisc handle X:0 */ |
| 1317 | |
David S. Miller | e8a0464 | 2008-07-17 00:34:19 -0700 | [diff] [blame] | 1318 | dev_queue = netdev_get_tx_queue(dev, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | if (pid != TC_H_ROOT) { |
| 1320 | u32 qid1 = TC_H_MAJ(pid); |
| 1321 | |
| 1322 | if (qid && qid1) { |
| 1323 | /* If both majors are known, they must be identical. */ |
| 1324 | if (qid != qid1) |
| 1325 | return -EINVAL; |
| 1326 | } else if (qid1) { |
| 1327 | qid = qid1; |
| 1328 | } else if (qid == 0) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 1329 | qid = dev_queue->qdisc_sleeping->handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | |
| 1331 | /* Now qid is genuine qdisc handle consistent |
| 1332 | both with parent and child. |
| 1333 | |
| 1334 | TC_H_MAJ(pid) still may be unspecified, complete it now. |
| 1335 | */ |
| 1336 | if (pid) |
| 1337 | pid = TC_H_MAKE(qid, pid); |
| 1338 | } else { |
| 1339 | if (qid == 0) |
David S. Miller | b0e1e64 | 2008-07-08 17:42:10 -0700 | [diff] [blame] | 1340 | qid = dev_queue->qdisc_sleeping->handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1341 | } |
| 1342 | |
| 1343 | /* OK. Locate qdisc */ |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1344 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | return -ENOENT; |
| 1346 | |
| 1347 | /* An check that it supports classes */ |
| 1348 | cops = q->ops->cl_ops; |
| 1349 | if (cops == NULL) |
| 1350 | return -EINVAL; |
| 1351 | |
| 1352 | /* Now try to get class */ |
| 1353 | if (clid == 0) { |
| 1354 | if (pid == TC_H_ROOT) |
| 1355 | clid = qid; |
| 1356 | } else |
| 1357 | clid = TC_H_MAKE(qid, clid); |
| 1358 | |
| 1359 | if (clid) |
| 1360 | cl = cops->get(q, clid); |
| 1361 | |
| 1362 | if (cl == 0) { |
| 1363 | err = -ENOENT; |
| 1364 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) |
| 1365 | goto out; |
| 1366 | } else { |
| 1367 | switch (n->nlmsg_type) { |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1368 | case RTM_NEWTCLASS: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | err = -EEXIST; |
| 1370 | if (n->nlmsg_flags&NLM_F_EXCL) |
| 1371 | goto out; |
| 1372 | break; |
| 1373 | case RTM_DELTCLASS: |
| 1374 | err = cops->delete(q, cl); |
| 1375 | if (err == 0) |
| 1376 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); |
| 1377 | goto out; |
| 1378 | case RTM_GETTCLASS: |
| 1379 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); |
| 1380 | goto out; |
| 1381 | default: |
| 1382 | err = -EINVAL; |
| 1383 | goto out; |
| 1384 | } |
| 1385 | } |
| 1386 | |
| 1387 | new_cl = cl; |
| 1388 | err = cops->change(q, clid, pid, tca, &new_cl); |
| 1389 | if (err == 0) |
| 1390 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); |
| 1391 | |
| 1392 | out: |
| 1393 | if (cl) |
| 1394 | cops->put(q, cl); |
| 1395 | |
| 1396 | return err; |
| 1397 | } |
| 1398 | |
| 1399 | |
| 1400 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
| 1401 | unsigned long cl, |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 1402 | u32 pid, u32 seq, u16 flags, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | { |
| 1404 | struct tcmsg *tcm; |
| 1405 | struct nlmsghdr *nlh; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1406 | unsigned char *b = skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | struct gnet_dump d; |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1408 | const struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 1410 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | tcm = NLMSG_DATA(nlh); |
| 1412 | tcm->tcm_family = AF_UNSPEC; |
David S. Miller | 5ce2d48 | 2008-07-08 17:06:30 -0700 | [diff] [blame] | 1413 | tcm->tcm_ifindex = qdisc_dev(q)->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | tcm->tcm_parent = q->handle; |
| 1415 | tcm->tcm_handle = q->handle; |
| 1416 | tcm->tcm_info = 0; |
Patrick McHardy | 57e1c48 | 2008-01-23 20:34:28 -0800 | [diff] [blame] | 1417 | NLA_PUT_STRING(skb, TCA_KIND, q->ops->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1419 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1420 | |
| 1421 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 1422 | TCA_XSTATS, qdisc_root_lock(q), &d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1423 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
| 1425 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1426 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | |
| 1428 | if (gnet_stats_finish_copy(&d) < 0) |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1429 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1431 | nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | return skb->len; |
| 1433 | |
| 1434 | nlmsg_failure: |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 1435 | nla_put_failure: |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 1436 | nlmsg_trim(skb, b); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | return -1; |
| 1438 | } |
| 1439 | |
| 1440 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 1441 | struct Qdisc *q, unsigned long cl, int event) |
| 1442 | { |
| 1443 | struct sk_buff *skb; |
| 1444 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; |
| 1445 | |
| 1446 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1447 | if (!skb) |
| 1448 | return -ENOBUFS; |
| 1449 | |
| 1450 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { |
| 1451 | kfree_skb(skb); |
| 1452 | return -EINVAL; |
| 1453 | } |
| 1454 | |
Denis V. Lunev | 97c53ca | 2007-11-19 22:26:51 -0800 | [diff] [blame] | 1455 | return rtnetlink_send(skb, &init_net, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | } |
| 1457 | |
| 1458 | struct qdisc_dump_args |
| 1459 | { |
| 1460 | struct qdisc_walker w; |
| 1461 | struct sk_buff *skb; |
| 1462 | struct netlink_callback *cb; |
| 1463 | }; |
| 1464 | |
| 1465 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) |
| 1466 | { |
| 1467 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; |
| 1468 | |
| 1469 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, |
| 1470 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); |
| 1471 | } |
| 1472 | |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1473 | static int tc_dump_tclass_qdisc(struct Qdisc *q, struct sk_buff *skb, |
| 1474 | struct tcmsg *tcm, struct netlink_callback *cb, |
| 1475 | int *t_p, int s_t) |
| 1476 | { |
| 1477 | struct qdisc_dump_args arg; |
| 1478 | |
| 1479 | if (tc_qdisc_dump_ignore(q) || |
| 1480 | *t_p < s_t || !q->ops->cl_ops || |
| 1481 | (tcm->tcm_parent && |
| 1482 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { |
| 1483 | (*t_p)++; |
| 1484 | return 0; |
| 1485 | } |
| 1486 | if (*t_p > s_t) |
| 1487 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); |
| 1488 | arg.w.fn = qdisc_class_dump; |
| 1489 | arg.skb = skb; |
| 1490 | arg.cb = cb; |
| 1491 | arg.w.stop = 0; |
| 1492 | arg.w.skip = cb->args[1]; |
| 1493 | arg.w.count = 0; |
| 1494 | q->ops->cl_ops->walk(q, &arg.w); |
| 1495 | cb->args[1] = arg.w.count; |
| 1496 | if (arg.w.stop) |
| 1497 | return -1; |
| 1498 | (*t_p)++; |
| 1499 | return 0; |
| 1500 | } |
| 1501 | |
| 1502 | static int tc_dump_tclass_root(struct Qdisc *root, struct sk_buff *skb, |
| 1503 | struct tcmsg *tcm, struct netlink_callback *cb, |
| 1504 | int *t_p, int s_t) |
| 1505 | { |
| 1506 | struct Qdisc *q; |
| 1507 | |
| 1508 | if (!root) |
| 1509 | return 0; |
| 1510 | |
| 1511 | if (tc_dump_tclass_qdisc(root, skb, tcm, cb, t_p, s_t) < 0) |
| 1512 | return -1; |
| 1513 | |
| 1514 | list_for_each_entry(q, &root->list, list) { |
| 1515 | if (tc_dump_tclass_qdisc(q, skb, tcm, cb, t_p, s_t) < 0) |
| 1516 | return -1; |
| 1517 | } |
| 1518 | |
| 1519 | return 0; |
| 1520 | } |
| 1521 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
| 1523 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1525 | struct net *net = sock_net(skb->sk); |
| 1526 | struct netdev_queue *dev_queue; |
| 1527 | struct net_device *dev; |
| 1528 | int t, s_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 1530 | if (net != &init_net) |
| 1531 | return 0; |
| 1532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
| 1534 | return 0; |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1535 | if ((dev = dev_get_by_index(&init_net, tcm->tcm_ifindex)) == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | return 0; |
| 1537 | |
| 1538 | s_t = cb->args[0]; |
| 1539 | t = 0; |
| 1540 | |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1541 | dev_queue = netdev_get_tx_queue(dev, 0); |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 1542 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1543 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1545 | dev_queue = &dev->rx_queue; |
David S. Miller | 8123b42 | 2008-08-08 23:23:39 -0700 | [diff] [blame] | 1546 | if (tc_dump_tclass_root(dev_queue->qdisc_sleeping, skb, tcm, cb, &t, s_t) < 0) |
David S. Miller | 3072367 | 2008-07-18 22:50:15 -0700 | [diff] [blame] | 1547 | goto done; |
| 1548 | |
| 1549 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | cb->args[0] = t; |
| 1551 | |
| 1552 | dev_put(dev); |
| 1553 | return skb->len; |
| 1554 | } |
| 1555 | |
| 1556 | /* Main classifier routine: scans classifier chain attached |
| 1557 | to this qdisc, (optionally) tests for protocol and asks |
| 1558 | specific classifiers. |
| 1559 | */ |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1560 | int tc_classify_compat(struct sk_buff *skb, struct tcf_proto *tp, |
| 1561 | struct tcf_result *res) |
| 1562 | { |
| 1563 | __be16 protocol = skb->protocol; |
| 1564 | int err = 0; |
| 1565 | |
| 1566 | for (; tp; tp = tp->next) { |
| 1567 | if ((tp->protocol == protocol || |
| 1568 | tp->protocol == htons(ETH_P_ALL)) && |
| 1569 | (err = tp->classify(skb, tp, res)) >= 0) { |
| 1570 | #ifdef CONFIG_NET_CLS_ACT |
| 1571 | if (err != TC_ACT_RECLASSIFY && skb->tc_verd) |
| 1572 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, 0); |
| 1573 | #endif |
| 1574 | return err; |
| 1575 | } |
| 1576 | } |
| 1577 | return -1; |
| 1578 | } |
| 1579 | EXPORT_SYMBOL(tc_classify_compat); |
| 1580 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1582 | struct tcf_result *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | { |
| 1584 | int err = 0; |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1585 | __be16 protocol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | #ifdef CONFIG_NET_CLS_ACT |
| 1587 | struct tcf_proto *otp = tp; |
| 1588 | reclassify: |
| 1589 | #endif |
| 1590 | protocol = skb->protocol; |
| 1591 | |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1592 | err = tc_classify_compat(skb, tp, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | #ifdef CONFIG_NET_CLS_ACT |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1594 | if (err == TC_ACT_RECLASSIFY) { |
| 1595 | u32 verd = G_TC_VERD(skb->tc_verd); |
| 1596 | tp = otp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1598 | if (verd++ >= MAX_REC_LOOP) { |
| 1599 | printk("rule prio %u protocol %02x reclassify loop, " |
| 1600 | "packet dropped\n", |
| 1601 | tp->prio&0xffff, ntohs(tp->protocol)); |
| 1602 | return TC_ACT_SHOT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | } |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1604 | skb->tc_verd = SET_TC_VERD(skb->tc_verd, verd); |
| 1605 | goto reclassify; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | } |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1607 | #endif |
| 1608 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | } |
Patrick McHardy | 73ca491 | 2007-07-15 00:02:31 -0700 | [diff] [blame] | 1610 | EXPORT_SYMBOL(tc_classify); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | |
Patrick McHardy | a48b5a6 | 2007-03-23 11:29:43 -0700 | [diff] [blame] | 1612 | void tcf_destroy(struct tcf_proto *tp) |
| 1613 | { |
| 1614 | tp->ops->destroy(tp); |
| 1615 | module_put(tp->ops->owner); |
| 1616 | kfree(tp); |
| 1617 | } |
| 1618 | |
Patrick McHardy | ff31ab5 | 2008-07-01 19:52:38 -0700 | [diff] [blame] | 1619 | void tcf_destroy_chain(struct tcf_proto **fl) |
Patrick McHardy | a48b5a6 | 2007-03-23 11:29:43 -0700 | [diff] [blame] | 1620 | { |
| 1621 | struct tcf_proto *tp; |
| 1622 | |
Patrick McHardy | ff31ab5 | 2008-07-01 19:52:38 -0700 | [diff] [blame] | 1623 | while ((tp = *fl) != NULL) { |
| 1624 | *fl = tp->next; |
Patrick McHardy | a48b5a6 | 2007-03-23 11:29:43 -0700 | [diff] [blame] | 1625 | tcf_destroy(tp); |
| 1626 | } |
| 1627 | } |
| 1628 | EXPORT_SYMBOL(tcf_destroy_chain); |
| 1629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | #ifdef CONFIG_PROC_FS |
| 1631 | static int psched_show(struct seq_file *seq, void *v) |
| 1632 | { |
Patrick McHardy | 3c0cfc1 | 2007-10-10 16:32:41 -0700 | [diff] [blame] | 1633 | struct timespec ts; |
| 1634 | |
| 1635 | hrtimer_get_res(CLOCK_MONOTONIC, &ts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | seq_printf(seq, "%08x %08x %08x %08x\n", |
Patrick McHardy | 641b9e0 | 2007-03-16 01:18:42 -0700 | [diff] [blame] | 1637 | (u32)NSEC_PER_USEC, (u32)PSCHED_US2NS(1), |
Patrick McHardy | 514bca3 | 2007-03-16 12:34:52 -0700 | [diff] [blame] | 1638 | 1000000, |
Patrick McHardy | 3c0cfc1 | 2007-10-10 16:32:41 -0700 | [diff] [blame] | 1639 | (u32)NSEC_PER_SEC/(u32)ktime_to_ns(timespec_to_ktime(ts))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | |
| 1641 | return 0; |
| 1642 | } |
| 1643 | |
| 1644 | static int psched_open(struct inode *inode, struct file *file) |
| 1645 | { |
| 1646 | return single_open(file, psched_show, PDE(inode)->data); |
| 1647 | } |
| 1648 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 1649 | static const struct file_operations psched_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | .owner = THIS_MODULE, |
| 1651 | .open = psched_open, |
| 1652 | .read = seq_read, |
| 1653 | .llseek = seq_lseek, |
| 1654 | .release = single_release, |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 1655 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | #endif |
| 1657 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1658 | static int __init pktsched_init(void) |
| 1659 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | register_qdisc(&pfifo_qdisc_ops); |
| 1661 | register_qdisc(&bfifo_qdisc_ops); |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 1662 | proc_net_fops_create(&init_net, "psched", 0, &psched_fops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1663 | |
Thomas Graf | be577dd | 2007-03-22 11:55:50 -0700 | [diff] [blame] | 1664 | rtnl_register(PF_UNSPEC, RTM_NEWQDISC, tc_modify_qdisc, NULL); |
| 1665 | rtnl_register(PF_UNSPEC, RTM_DELQDISC, tc_get_qdisc, NULL); |
| 1666 | rtnl_register(PF_UNSPEC, RTM_GETQDISC, tc_get_qdisc, tc_dump_qdisc); |
| 1667 | rtnl_register(PF_UNSPEC, RTM_NEWTCLASS, tc_ctl_tclass, NULL); |
| 1668 | rtnl_register(PF_UNSPEC, RTM_DELTCLASS, tc_ctl_tclass, NULL); |
| 1669 | rtnl_register(PF_UNSPEC, RTM_GETTCLASS, tc_ctl_tclass, tc_dump_tclass); |
| 1670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | return 0; |
| 1672 | } |
| 1673 | |
| 1674 | subsys_initcall(pktsched_init); |