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> |
| 21 | #include <linux/sched.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/mm.h> |
| 24 | #include <linux/socket.h> |
| 25 | #include <linux/sockios.h> |
| 26 | #include <linux/in.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/interrupt.h> |
| 29 | #include <linux/netdevice.h> |
| 30 | #include <linux/skbuff.h> |
| 31 | #include <linux/rtnetlink.h> |
| 32 | #include <linux/init.h> |
| 33 | #include <linux/proc_fs.h> |
| 34 | #include <linux/seq_file.h> |
| 35 | #include <linux/kmod.h> |
| 36 | #include <linux/list.h> |
| 37 | #include <linux/bitops.h> |
| 38 | |
| 39 | #include <net/sock.h> |
| 40 | #include <net/pkt_sched.h> |
| 41 | |
| 42 | #include <asm/processor.h> |
| 43 | #include <asm/uaccess.h> |
| 44 | #include <asm/system.h> |
| 45 | |
| 46 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, u32 clid, |
| 47 | struct Qdisc *old, struct Qdisc *new); |
| 48 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 49 | struct Qdisc *q, unsigned long cl, int event); |
| 50 | |
| 51 | /* |
| 52 | |
| 53 | Short review. |
| 54 | ------------- |
| 55 | |
| 56 | This file consists of two interrelated parts: |
| 57 | |
| 58 | 1. queueing disciplines manager frontend. |
| 59 | 2. traffic classes manager frontend. |
| 60 | |
| 61 | Generally, queueing discipline ("qdisc") is a black box, |
| 62 | which is able to enqueue packets and to dequeue them (when |
| 63 | device is ready to send something) in order and at times |
| 64 | determined by algorithm hidden in it. |
| 65 | |
| 66 | qdisc's are divided to two categories: |
| 67 | - "queues", which have no internal structure visible from outside. |
| 68 | - "schedulers", which split all the packets to "traffic classes", |
| 69 | using "packet classifiers" (look at cls_api.c) |
| 70 | |
| 71 | In turn, classes may have child qdiscs (as rule, queues) |
| 72 | attached to them etc. etc. etc. |
| 73 | |
| 74 | The goal of the routines in this file is to translate |
| 75 | information supplied by user in the form of handles |
| 76 | to more intelligible for kernel form, to make some sanity |
| 77 | checks and part of work, which is common to all qdiscs |
| 78 | and to provide rtnetlink notifications. |
| 79 | |
| 80 | All real intelligent work is done inside qdisc modules. |
| 81 | |
| 82 | |
| 83 | |
| 84 | Every discipline has two major routines: enqueue and dequeue. |
| 85 | |
| 86 | ---dequeue |
| 87 | |
| 88 | dequeue usually returns a skb to send. It is allowed to return NULL, |
| 89 | but it does not mean that queue is empty, it just means that |
| 90 | discipline does not want to send anything this time. |
| 91 | Queue is really empty if q->q.qlen == 0. |
| 92 | For complicated disciplines with multiple queues q->q is not |
| 93 | real packet queue, but however q->q.qlen must be valid. |
| 94 | |
| 95 | ---enqueue |
| 96 | |
| 97 | enqueue returns 0, if packet was enqueued successfully. |
| 98 | If packet (this one or another one) was dropped, it returns |
| 99 | not zero error code. |
| 100 | NET_XMIT_DROP - this packet dropped |
| 101 | Expected action: do not backoff, but wait until queue will clear. |
| 102 | NET_XMIT_CN - probably this packet enqueued, but another one dropped. |
| 103 | Expected action: backoff or ignore |
| 104 | NET_XMIT_POLICED - dropped by police. |
| 105 | Expected action: backoff or error to real-time apps. |
| 106 | |
| 107 | Auxiliary routines: |
| 108 | |
| 109 | ---requeue |
| 110 | |
| 111 | requeues once dequeued packet. It is used for non-standard or |
| 112 | just buggy devices, which can defer output even if dev->tbusy=0. |
| 113 | |
| 114 | ---reset |
| 115 | |
| 116 | returns qdisc to initial state: purge all buffers, clear all |
| 117 | timers, counters (except for statistics) etc. |
| 118 | |
| 119 | ---init |
| 120 | |
| 121 | initializes newly created qdisc. |
| 122 | |
| 123 | ---destroy |
| 124 | |
| 125 | destroys resources allocated by init and during lifetime of qdisc. |
| 126 | |
| 127 | ---change |
| 128 | |
| 129 | changes qdisc parameters. |
| 130 | */ |
| 131 | |
| 132 | /* Protects list of registered TC modules. It is pure SMP lock. */ |
| 133 | static DEFINE_RWLOCK(qdisc_mod_lock); |
| 134 | |
| 135 | |
| 136 | /************************************************ |
| 137 | * Queueing disciplines manipulation. * |
| 138 | ************************************************/ |
| 139 | |
| 140 | |
| 141 | /* The list of all installed queueing disciplines. */ |
| 142 | |
| 143 | static struct Qdisc_ops *qdisc_base; |
| 144 | |
| 145 | /* Register/uregister queueing discipline */ |
| 146 | |
| 147 | int register_qdisc(struct Qdisc_ops *qops) |
| 148 | { |
| 149 | struct Qdisc_ops *q, **qp; |
| 150 | int rc = -EEXIST; |
| 151 | |
| 152 | write_lock(&qdisc_mod_lock); |
| 153 | for (qp = &qdisc_base; (q = *qp) != NULL; qp = &q->next) |
| 154 | if (!strcmp(qops->id, q->id)) |
| 155 | goto out; |
| 156 | |
| 157 | if (qops->enqueue == NULL) |
| 158 | qops->enqueue = noop_qdisc_ops.enqueue; |
| 159 | if (qops->requeue == NULL) |
| 160 | qops->requeue = noop_qdisc_ops.requeue; |
| 161 | if (qops->dequeue == NULL) |
| 162 | qops->dequeue = noop_qdisc_ops.dequeue; |
| 163 | |
| 164 | qops->next = NULL; |
| 165 | *qp = qops; |
| 166 | rc = 0; |
| 167 | out: |
| 168 | write_unlock(&qdisc_mod_lock); |
| 169 | return rc; |
| 170 | } |
| 171 | |
| 172 | int unregister_qdisc(struct Qdisc_ops *qops) |
| 173 | { |
| 174 | struct Qdisc_ops *q, **qp; |
| 175 | int err = -ENOENT; |
| 176 | |
| 177 | write_lock(&qdisc_mod_lock); |
| 178 | for (qp = &qdisc_base; (q=*qp)!=NULL; qp = &q->next) |
| 179 | if (q == qops) |
| 180 | break; |
| 181 | if (q) { |
| 182 | *qp = q->next; |
| 183 | q->next = NULL; |
| 184 | err = 0; |
| 185 | } |
| 186 | write_unlock(&qdisc_mod_lock); |
| 187 | return err; |
| 188 | } |
| 189 | |
| 190 | /* We know handle. Find qdisc among all qdisc's attached to device |
| 191 | (root qdisc, all its children, children of children etc.) |
| 192 | */ |
| 193 | |
| 194 | struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle) |
| 195 | { |
| 196 | struct Qdisc *q; |
| 197 | |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 198 | read_lock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | list_for_each_entry(q, &dev->qdisc_list, list) { |
| 200 | if (q->handle == handle) { |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 201 | read_unlock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | return q; |
| 203 | } |
| 204 | } |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 205 | read_unlock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | return NULL; |
| 207 | } |
| 208 | |
| 209 | static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid) |
| 210 | { |
| 211 | unsigned long cl; |
| 212 | struct Qdisc *leaf; |
| 213 | struct Qdisc_class_ops *cops = p->ops->cl_ops; |
| 214 | |
| 215 | if (cops == NULL) |
| 216 | return NULL; |
| 217 | cl = cops->get(p, classid); |
| 218 | |
| 219 | if (cl == 0) |
| 220 | return NULL; |
| 221 | leaf = cops->leaf(p, cl); |
| 222 | cops->put(p, cl); |
| 223 | return leaf; |
| 224 | } |
| 225 | |
| 226 | /* Find queueing discipline by name */ |
| 227 | |
| 228 | static struct Qdisc_ops *qdisc_lookup_ops(struct rtattr *kind) |
| 229 | { |
| 230 | struct Qdisc_ops *q = NULL; |
| 231 | |
| 232 | if (kind) { |
| 233 | read_lock(&qdisc_mod_lock); |
| 234 | for (q = qdisc_base; q; q = q->next) { |
| 235 | if (rtattr_strcmp(kind, q->id) == 0) { |
| 236 | if (!try_module_get(q->owner)) |
| 237 | q = NULL; |
| 238 | break; |
| 239 | } |
| 240 | } |
| 241 | read_unlock(&qdisc_mod_lock); |
| 242 | } |
| 243 | return q; |
| 244 | } |
| 245 | |
| 246 | static struct qdisc_rate_table *qdisc_rtab_list; |
| 247 | |
| 248 | struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r, struct rtattr *tab) |
| 249 | { |
| 250 | struct qdisc_rate_table *rtab; |
| 251 | |
| 252 | for (rtab = qdisc_rtab_list; rtab; rtab = rtab->next) { |
| 253 | if (memcmp(&rtab->rate, r, sizeof(struct tc_ratespec)) == 0) { |
| 254 | rtab->refcnt++; |
| 255 | return rtab; |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | if (tab == NULL || r->rate == 0 || r->cell_log == 0 || RTA_PAYLOAD(tab) != 1024) |
| 260 | return NULL; |
| 261 | |
| 262 | rtab = kmalloc(sizeof(*rtab), GFP_KERNEL); |
| 263 | if (rtab) { |
| 264 | rtab->rate = *r; |
| 265 | rtab->refcnt = 1; |
| 266 | memcpy(rtab->data, RTA_DATA(tab), 1024); |
| 267 | rtab->next = qdisc_rtab_list; |
| 268 | qdisc_rtab_list = rtab; |
| 269 | } |
| 270 | return rtab; |
| 271 | } |
| 272 | |
| 273 | void qdisc_put_rtab(struct qdisc_rate_table *tab) |
| 274 | { |
| 275 | struct qdisc_rate_table *rtab, **rtabp; |
| 276 | |
| 277 | if (!tab || --tab->refcnt) |
| 278 | return; |
| 279 | |
| 280 | for (rtabp = &qdisc_rtab_list; (rtab=*rtabp) != NULL; rtabp = &rtab->next) { |
| 281 | if (rtab == tab) { |
| 282 | *rtabp = rtab->next; |
| 283 | kfree(rtab); |
| 284 | return; |
| 285 | } |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | |
| 290 | /* Allocate an unique handle from space managed by kernel */ |
| 291 | |
| 292 | static u32 qdisc_alloc_handle(struct net_device *dev) |
| 293 | { |
| 294 | int i = 0x10000; |
| 295 | static u32 autohandle = TC_H_MAKE(0x80000000U, 0); |
| 296 | |
| 297 | do { |
| 298 | autohandle += TC_H_MAKE(0x10000U, 0); |
| 299 | if (autohandle == TC_H_MAKE(TC_H_ROOT, 0)) |
| 300 | autohandle = TC_H_MAKE(0x80000000U, 0); |
| 301 | } while (qdisc_lookup(dev, autohandle) && --i > 0); |
| 302 | |
| 303 | return i>0 ? autohandle : 0; |
| 304 | } |
| 305 | |
| 306 | /* Attach toplevel qdisc to device dev */ |
| 307 | |
| 308 | static struct Qdisc * |
| 309 | dev_graft_qdisc(struct net_device *dev, struct Qdisc *qdisc) |
| 310 | { |
| 311 | struct Qdisc *oqdisc; |
| 312 | |
| 313 | if (dev->flags & IFF_UP) |
| 314 | dev_deactivate(dev); |
| 315 | |
| 316 | qdisc_lock_tree(dev); |
| 317 | if (qdisc && qdisc->flags&TCQ_F_INGRESS) { |
| 318 | oqdisc = dev->qdisc_ingress; |
| 319 | /* Prune old scheduler */ |
| 320 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) { |
| 321 | /* delete */ |
| 322 | qdisc_reset(oqdisc); |
| 323 | dev->qdisc_ingress = NULL; |
| 324 | } else { /* new */ |
| 325 | dev->qdisc_ingress = qdisc; |
| 326 | } |
| 327 | |
| 328 | } else { |
| 329 | |
| 330 | oqdisc = dev->qdisc_sleeping; |
| 331 | |
| 332 | /* Prune old scheduler */ |
| 333 | if (oqdisc && atomic_read(&oqdisc->refcnt) <= 1) |
| 334 | qdisc_reset(oqdisc); |
| 335 | |
| 336 | /* ... and graft new one */ |
| 337 | if (qdisc == NULL) |
| 338 | qdisc = &noop_qdisc; |
| 339 | dev->qdisc_sleeping = qdisc; |
| 340 | dev->qdisc = &noop_qdisc; |
| 341 | } |
| 342 | |
| 343 | qdisc_unlock_tree(dev); |
| 344 | |
| 345 | if (dev->flags & IFF_UP) |
| 346 | dev_activate(dev); |
| 347 | |
| 348 | return oqdisc; |
| 349 | } |
| 350 | |
| 351 | |
| 352 | /* Graft qdisc "new" to class "classid" of qdisc "parent" or |
| 353 | to device "dev". |
| 354 | |
| 355 | Old qdisc is not destroyed but returned in *old. |
| 356 | */ |
| 357 | |
| 358 | static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, |
| 359 | u32 classid, |
| 360 | struct Qdisc *new, struct Qdisc **old) |
| 361 | { |
| 362 | int err = 0; |
| 363 | struct Qdisc *q = *old; |
| 364 | |
| 365 | |
| 366 | if (parent == NULL) { |
| 367 | if (q && q->flags&TCQ_F_INGRESS) { |
| 368 | *old = dev_graft_qdisc(dev, q); |
| 369 | } else { |
| 370 | *old = dev_graft_qdisc(dev, new); |
| 371 | } |
| 372 | } else { |
| 373 | struct Qdisc_class_ops *cops = parent->ops->cl_ops; |
| 374 | |
| 375 | err = -EINVAL; |
| 376 | |
| 377 | if (cops) { |
| 378 | unsigned long cl = cops->get(parent, classid); |
| 379 | if (cl) { |
| 380 | err = cops->graft(parent, cl, new, old); |
| 381 | if (new) |
| 382 | new->parent = classid; |
| 383 | cops->put(parent, cl); |
| 384 | } |
| 385 | } |
| 386 | } |
| 387 | return err; |
| 388 | } |
| 389 | |
| 390 | /* |
| 391 | Allocate and initialize new qdisc. |
| 392 | |
| 393 | Parameters are passed via opt. |
| 394 | */ |
| 395 | |
| 396 | static struct Qdisc * |
| 397 | qdisc_create(struct net_device *dev, u32 handle, struct rtattr **tca, int *errp) |
| 398 | { |
| 399 | int err; |
| 400 | struct rtattr *kind = tca[TCA_KIND-1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | struct Qdisc *sch; |
| 402 | struct Qdisc_ops *ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | |
| 404 | ops = qdisc_lookup_ops(kind); |
| 405 | #ifdef CONFIG_KMOD |
| 406 | if (ops == NULL && kind != NULL) { |
| 407 | char name[IFNAMSIZ]; |
| 408 | if (rtattr_strlcpy(name, kind, IFNAMSIZ) < IFNAMSIZ) { |
| 409 | /* We dropped the RTNL semaphore in order to |
| 410 | * perform the module load. So, even if we |
| 411 | * succeeded in loading the module we have to |
| 412 | * tell the caller to replay the request. We |
| 413 | * indicate this using -EAGAIN. |
| 414 | * We replay the request because the device may |
| 415 | * go away in the mean time. |
| 416 | */ |
| 417 | rtnl_unlock(); |
| 418 | request_module("sch_%s", name); |
| 419 | rtnl_lock(); |
| 420 | ops = qdisc_lookup_ops(kind); |
| 421 | if (ops != NULL) { |
| 422 | /* We will try again qdisc_lookup_ops, |
| 423 | * so don't keep a reference. |
| 424 | */ |
| 425 | module_put(ops->owner); |
| 426 | err = -EAGAIN; |
| 427 | goto err_out; |
| 428 | } |
| 429 | } |
| 430 | } |
| 431 | #endif |
| 432 | |
Jamal Hadi Salim | b9e2cc0 | 2006-08-03 16:36:51 -0700 | [diff] [blame] | 433 | err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | if (ops == NULL) |
| 435 | goto err_out; |
| 436 | |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 437 | sch = qdisc_alloc(dev, ops); |
| 438 | if (IS_ERR(sch)) { |
| 439 | err = PTR_ERR(sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | goto err_out2; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 441 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 443 | if (handle == TC_H_INGRESS) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | sch->flags |= TCQ_F_INGRESS; |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 445 | handle = TC_H_MAKE(TC_H_INGRESS, 0); |
| 446 | } else if (handle == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | handle = qdisc_alloc_handle(dev); |
| 448 | err = -ENOMEM; |
| 449 | if (handle == 0) |
| 450 | goto err_out3; |
| 451 | } |
| 452 | |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 453 | sch->handle = handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | if (!ops->init || (err = ops->init(sch, tca[TCA_OPTIONS-1])) == 0) { |
Thomas Graf | 023e09a | 2005-07-05 14:15:53 -0700 | [diff] [blame] | 456 | #ifdef CONFIG_NET_ESTIMATOR |
| 457 | if (tca[TCA_RATE-1]) { |
| 458 | err = gen_new_estimator(&sch->bstats, &sch->rate_est, |
| 459 | sch->stats_lock, |
| 460 | tca[TCA_RATE-1]); |
| 461 | if (err) { |
| 462 | /* |
| 463 | * Any broken qdiscs that would require |
| 464 | * a ops->reset() here? The qdisc was never |
| 465 | * in action so it shouldn't be necessary. |
| 466 | */ |
| 467 | if (ops->destroy) |
| 468 | ops->destroy(sch); |
| 469 | goto err_out3; |
| 470 | } |
| 471 | } |
| 472 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | qdisc_lock_tree(dev); |
| 474 | list_add_tail(&sch->list, &dev->qdisc_list); |
| 475 | qdisc_unlock_tree(dev); |
| 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return sch; |
| 478 | } |
| 479 | err_out3: |
| 480 | dev_put(dev); |
Thomas Graf | 3d54b82 | 2005-07-05 14:15:09 -0700 | [diff] [blame] | 481 | kfree((char *) sch - sch->padded); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | err_out2: |
| 483 | module_put(ops->owner); |
| 484 | err_out: |
| 485 | *errp = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | return NULL; |
| 487 | } |
| 488 | |
| 489 | static int qdisc_change(struct Qdisc *sch, struct rtattr **tca) |
| 490 | { |
| 491 | if (tca[TCA_OPTIONS-1]) { |
| 492 | int err; |
| 493 | |
| 494 | if (sch->ops->change == NULL) |
| 495 | return -EINVAL; |
| 496 | err = sch->ops->change(sch, tca[TCA_OPTIONS-1]); |
| 497 | if (err) |
| 498 | return err; |
| 499 | } |
| 500 | #ifdef CONFIG_NET_ESTIMATOR |
| 501 | if (tca[TCA_RATE-1]) |
| 502 | gen_replace_estimator(&sch->bstats, &sch->rate_est, |
| 503 | sch->stats_lock, tca[TCA_RATE-1]); |
| 504 | #endif |
| 505 | return 0; |
| 506 | } |
| 507 | |
| 508 | struct check_loop_arg |
| 509 | { |
| 510 | struct qdisc_walker w; |
| 511 | struct Qdisc *p; |
| 512 | int depth; |
| 513 | }; |
| 514 | |
| 515 | static int check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w); |
| 516 | |
| 517 | static int check_loop(struct Qdisc *q, struct Qdisc *p, int depth) |
| 518 | { |
| 519 | struct check_loop_arg arg; |
| 520 | |
| 521 | if (q->ops->cl_ops == NULL) |
| 522 | return 0; |
| 523 | |
| 524 | arg.w.stop = arg.w.skip = arg.w.count = 0; |
| 525 | arg.w.fn = check_loop_fn; |
| 526 | arg.depth = depth; |
| 527 | arg.p = p; |
| 528 | q->ops->cl_ops->walk(q, &arg.w); |
| 529 | return arg.w.stop ? -ELOOP : 0; |
| 530 | } |
| 531 | |
| 532 | static int |
| 533 | check_loop_fn(struct Qdisc *q, unsigned long cl, struct qdisc_walker *w) |
| 534 | { |
| 535 | struct Qdisc *leaf; |
| 536 | struct Qdisc_class_ops *cops = q->ops->cl_ops; |
| 537 | struct check_loop_arg *arg = (struct check_loop_arg *)w; |
| 538 | |
| 539 | leaf = cops->leaf(q, cl); |
| 540 | if (leaf) { |
| 541 | if (leaf == arg->p || arg->depth > 7) |
| 542 | return -ELOOP; |
| 543 | return check_loop(leaf, arg->p, arg->depth + 1); |
| 544 | } |
| 545 | return 0; |
| 546 | } |
| 547 | |
| 548 | /* |
| 549 | * Delete/get qdisc. |
| 550 | */ |
| 551 | |
| 552 | static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 553 | { |
| 554 | struct tcmsg *tcm = NLMSG_DATA(n); |
| 555 | struct rtattr **tca = arg; |
| 556 | struct net_device *dev; |
| 557 | u32 clid = tcm->tcm_parent; |
| 558 | struct Qdisc *q = NULL; |
| 559 | struct Qdisc *p = NULL; |
| 560 | int err; |
| 561 | |
| 562 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) |
| 563 | return -ENODEV; |
| 564 | |
| 565 | if (clid) { |
| 566 | if (clid != TC_H_ROOT) { |
| 567 | if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { |
| 568 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) |
| 569 | return -ENOENT; |
| 570 | q = qdisc_leaf(p, clid); |
| 571 | } else { /* ingress */ |
| 572 | q = dev->qdisc_ingress; |
| 573 | } |
| 574 | } else { |
| 575 | q = dev->qdisc_sleeping; |
| 576 | } |
| 577 | if (!q) |
| 578 | return -ENOENT; |
| 579 | |
| 580 | if (tcm->tcm_handle && q->handle != tcm->tcm_handle) |
| 581 | return -EINVAL; |
| 582 | } else { |
| 583 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) |
| 584 | return -ENOENT; |
| 585 | } |
| 586 | |
| 587 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) |
| 588 | return -EINVAL; |
| 589 | |
| 590 | if (n->nlmsg_type == RTM_DELQDISC) { |
| 591 | if (!clid) |
| 592 | return -EINVAL; |
| 593 | if (q->handle == 0) |
| 594 | return -ENOENT; |
| 595 | if ((err = qdisc_graft(dev, p, clid, NULL, &q)) != 0) |
| 596 | return err; |
| 597 | if (q) { |
| 598 | qdisc_notify(skb, n, clid, q, NULL); |
| 599 | spin_lock_bh(&dev->queue_lock); |
| 600 | qdisc_destroy(q); |
| 601 | spin_unlock_bh(&dev->queue_lock); |
| 602 | } |
| 603 | } else { |
| 604 | qdisc_notify(skb, n, clid, NULL, q); |
| 605 | } |
| 606 | return 0; |
| 607 | } |
| 608 | |
| 609 | /* |
| 610 | Create/change qdisc. |
| 611 | */ |
| 612 | |
| 613 | static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 614 | { |
| 615 | struct tcmsg *tcm; |
| 616 | struct rtattr **tca; |
| 617 | struct net_device *dev; |
| 618 | u32 clid; |
| 619 | struct Qdisc *q, *p; |
| 620 | int err; |
| 621 | |
| 622 | replay: |
| 623 | /* Reinit, just in case something touches this. */ |
| 624 | tcm = NLMSG_DATA(n); |
| 625 | tca = arg; |
| 626 | clid = tcm->tcm_parent; |
| 627 | q = p = NULL; |
| 628 | |
| 629 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) |
| 630 | return -ENODEV; |
| 631 | |
| 632 | if (clid) { |
| 633 | if (clid != TC_H_ROOT) { |
| 634 | if (clid != TC_H_INGRESS) { |
| 635 | if ((p = qdisc_lookup(dev, TC_H_MAJ(clid))) == NULL) |
| 636 | return -ENOENT; |
| 637 | q = qdisc_leaf(p, clid); |
| 638 | } else { /*ingress */ |
| 639 | q = dev->qdisc_ingress; |
| 640 | } |
| 641 | } else { |
| 642 | q = dev->qdisc_sleeping; |
| 643 | } |
| 644 | |
| 645 | /* It may be default qdisc, ignore it */ |
| 646 | if (q && q->handle == 0) |
| 647 | q = NULL; |
| 648 | |
| 649 | if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { |
| 650 | if (tcm->tcm_handle) { |
| 651 | if (q && !(n->nlmsg_flags&NLM_F_REPLACE)) |
| 652 | return -EEXIST; |
| 653 | if (TC_H_MIN(tcm->tcm_handle)) |
| 654 | return -EINVAL; |
| 655 | if ((q = qdisc_lookup(dev, tcm->tcm_handle)) == NULL) |
| 656 | goto create_n_graft; |
| 657 | if (n->nlmsg_flags&NLM_F_EXCL) |
| 658 | return -EEXIST; |
| 659 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) |
| 660 | return -EINVAL; |
| 661 | if (q == p || |
| 662 | (p && check_loop(q, p, 0))) |
| 663 | return -ELOOP; |
| 664 | atomic_inc(&q->refcnt); |
| 665 | goto graft; |
| 666 | } else { |
| 667 | if (q == NULL) |
| 668 | goto create_n_graft; |
| 669 | |
| 670 | /* This magic test requires explanation. |
| 671 | * |
| 672 | * We know, that some child q is already |
| 673 | * attached to this parent and have choice: |
| 674 | * either to change it or to create/graft new one. |
| 675 | * |
| 676 | * 1. We are allowed to create/graft only |
| 677 | * if CREATE and REPLACE flags are set. |
| 678 | * |
| 679 | * 2. If EXCL is set, requestor wanted to say, |
| 680 | * that qdisc tcm_handle is not expected |
| 681 | * to exist, so that we choose create/graft too. |
| 682 | * |
| 683 | * 3. The last case is when no flags are set. |
| 684 | * Alas, it is sort of hole in API, we |
| 685 | * cannot decide what to do unambiguously. |
| 686 | * For now we select create/graft, if |
| 687 | * user gave KIND, which does not match existing. |
| 688 | */ |
| 689 | if ((n->nlmsg_flags&NLM_F_CREATE) && |
| 690 | (n->nlmsg_flags&NLM_F_REPLACE) && |
| 691 | ((n->nlmsg_flags&NLM_F_EXCL) || |
| 692 | (tca[TCA_KIND-1] && |
| 693 | rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)))) |
| 694 | goto create_n_graft; |
| 695 | } |
| 696 | } |
| 697 | } else { |
| 698 | if (!tcm->tcm_handle) |
| 699 | return -EINVAL; |
| 700 | q = qdisc_lookup(dev, tcm->tcm_handle); |
| 701 | } |
| 702 | |
| 703 | /* Change qdisc parameters */ |
| 704 | if (q == NULL) |
| 705 | return -ENOENT; |
| 706 | if (n->nlmsg_flags&NLM_F_EXCL) |
| 707 | return -EEXIST; |
| 708 | if (tca[TCA_KIND-1] && rtattr_strcmp(tca[TCA_KIND-1], q->ops->id)) |
| 709 | return -EINVAL; |
| 710 | err = qdisc_change(q, tca); |
| 711 | if (err == 0) |
| 712 | qdisc_notify(skb, n, clid, NULL, q); |
| 713 | return err; |
| 714 | |
| 715 | create_n_graft: |
| 716 | if (!(n->nlmsg_flags&NLM_F_CREATE)) |
| 717 | return -ENOENT; |
| 718 | if (clid == TC_H_INGRESS) |
| 719 | q = qdisc_create(dev, tcm->tcm_parent, tca, &err); |
| 720 | else |
| 721 | q = qdisc_create(dev, tcm->tcm_handle, tca, &err); |
| 722 | if (q == NULL) { |
| 723 | if (err == -EAGAIN) |
| 724 | goto replay; |
| 725 | return err; |
| 726 | } |
| 727 | |
| 728 | graft: |
| 729 | if (1) { |
| 730 | struct Qdisc *old_q = NULL; |
| 731 | err = qdisc_graft(dev, p, clid, q, &old_q); |
| 732 | if (err) { |
| 733 | if (q) { |
| 734 | spin_lock_bh(&dev->queue_lock); |
| 735 | qdisc_destroy(q); |
| 736 | spin_unlock_bh(&dev->queue_lock); |
| 737 | } |
| 738 | return err; |
| 739 | } |
| 740 | qdisc_notify(skb, n, clid, old_q, q); |
| 741 | if (old_q) { |
| 742 | spin_lock_bh(&dev->queue_lock); |
| 743 | qdisc_destroy(old_q); |
| 744 | spin_unlock_bh(&dev->queue_lock); |
| 745 | } |
| 746 | } |
| 747 | return 0; |
| 748 | } |
| 749 | |
| 750 | 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] | 751 | u32 pid, u32 seq, u16 flags, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | { |
| 753 | struct tcmsg *tcm; |
| 754 | struct nlmsghdr *nlh; |
| 755 | unsigned char *b = skb->tail; |
| 756 | struct gnet_dump d; |
| 757 | |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 758 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | tcm = NLMSG_DATA(nlh); |
| 760 | tcm->tcm_family = AF_UNSPEC; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 761 | tcm->tcm__pad1 = 0; |
| 762 | tcm->tcm__pad2 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | tcm->tcm_ifindex = q->dev->ifindex; |
| 764 | tcm->tcm_parent = clid; |
| 765 | tcm->tcm_handle = q->handle; |
| 766 | tcm->tcm_info = atomic_read(&q->refcnt); |
| 767 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id); |
| 768 | if (q->ops->dump && q->ops->dump(q, skb) < 0) |
| 769 | goto rtattr_failure; |
| 770 | q->qstats.qlen = q->q.qlen; |
| 771 | |
| 772 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, |
| 773 | TCA_XSTATS, q->stats_lock, &d) < 0) |
| 774 | goto rtattr_failure; |
| 775 | |
| 776 | if (q->ops->dump_stats && q->ops->dump_stats(q, &d) < 0) |
| 777 | goto rtattr_failure; |
| 778 | |
| 779 | if (gnet_stats_copy_basic(&d, &q->bstats) < 0 || |
| 780 | #ifdef CONFIG_NET_ESTIMATOR |
| 781 | gnet_stats_copy_rate_est(&d, &q->rate_est) < 0 || |
| 782 | #endif |
| 783 | gnet_stats_copy_queue(&d, &q->qstats) < 0) |
| 784 | goto rtattr_failure; |
| 785 | |
| 786 | if (gnet_stats_finish_copy(&d) < 0) |
| 787 | goto rtattr_failure; |
| 788 | |
| 789 | nlh->nlmsg_len = skb->tail - b; |
| 790 | return skb->len; |
| 791 | |
| 792 | nlmsg_failure: |
| 793 | rtattr_failure: |
| 794 | skb_trim(skb, b - skb->data); |
| 795 | return -1; |
| 796 | } |
| 797 | |
| 798 | static int qdisc_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 799 | u32 clid, struct Qdisc *old, struct Qdisc *new) |
| 800 | { |
| 801 | struct sk_buff *skb; |
| 802 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; |
| 803 | |
| 804 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 805 | if (!skb) |
| 806 | return -ENOBUFS; |
| 807 | |
| 808 | if (old && old->handle) { |
| 809 | if (tc_fill_qdisc(skb, old, clid, pid, n->nlmsg_seq, 0, RTM_DELQDISC) < 0) |
| 810 | goto err_out; |
| 811 | } |
| 812 | if (new) { |
| 813 | if (tc_fill_qdisc(skb, new, clid, pid, n->nlmsg_seq, old ? NLM_F_REPLACE : 0, RTM_NEWQDISC) < 0) |
| 814 | goto err_out; |
| 815 | } |
| 816 | |
| 817 | if (skb->len) |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 818 | return rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
| 820 | err_out: |
| 821 | kfree_skb(skb); |
| 822 | return -EINVAL; |
| 823 | } |
| 824 | |
| 825 | static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb) |
| 826 | { |
| 827 | int idx, q_idx; |
| 828 | int s_idx, s_q_idx; |
| 829 | struct net_device *dev; |
| 830 | struct Qdisc *q; |
| 831 | |
| 832 | s_idx = cb->args[0]; |
| 833 | s_q_idx = q_idx = cb->args[1]; |
| 834 | read_lock(&dev_base_lock); |
| 835 | for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { |
| 836 | if (idx < s_idx) |
| 837 | continue; |
| 838 | if (idx > s_idx) |
| 839 | s_q_idx = 0; |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 840 | read_lock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | q_idx = 0; |
| 842 | list_for_each_entry(q, &dev->qdisc_list, list) { |
| 843 | if (q_idx < s_q_idx) { |
| 844 | q_idx++; |
| 845 | continue; |
| 846 | } |
| 847 | if (tc_fill_qdisc(skb, q, q->parent, NETLINK_CB(cb->skb).pid, |
| 848 | cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWQDISC) <= 0) { |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 849 | read_unlock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | goto done; |
| 851 | } |
| 852 | q_idx++; |
| 853 | } |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 854 | read_unlock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | } |
| 856 | |
| 857 | done: |
| 858 | read_unlock(&dev_base_lock); |
| 859 | |
| 860 | cb->args[0] = idx; |
| 861 | cb->args[1] = q_idx; |
| 862 | |
| 863 | return skb->len; |
| 864 | } |
| 865 | |
| 866 | |
| 867 | |
| 868 | /************************************************ |
| 869 | * Traffic classes manipulation. * |
| 870 | ************************************************/ |
| 871 | |
| 872 | |
| 873 | |
| 874 | static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n, void *arg) |
| 875 | { |
| 876 | struct tcmsg *tcm = NLMSG_DATA(n); |
| 877 | struct rtattr **tca = arg; |
| 878 | struct net_device *dev; |
| 879 | struct Qdisc *q = NULL; |
| 880 | struct Qdisc_class_ops *cops; |
| 881 | unsigned long cl = 0; |
| 882 | unsigned long new_cl; |
| 883 | u32 pid = tcm->tcm_parent; |
| 884 | u32 clid = tcm->tcm_handle; |
| 885 | u32 qid = TC_H_MAJ(clid); |
| 886 | int err; |
| 887 | |
| 888 | if ((dev = __dev_get_by_index(tcm->tcm_ifindex)) == NULL) |
| 889 | return -ENODEV; |
| 890 | |
| 891 | /* |
| 892 | parent == TC_H_UNSPEC - unspecified parent. |
| 893 | parent == TC_H_ROOT - class is root, which has no parent. |
| 894 | parent == X:0 - parent is root class. |
| 895 | parent == X:Y - parent is a node in hierarchy. |
| 896 | parent == 0:Y - parent is X:Y, where X:0 is qdisc. |
| 897 | |
| 898 | handle == 0:0 - generate handle from kernel pool. |
| 899 | handle == 0:Y - class is X:Y, where X:0 is qdisc. |
| 900 | handle == X:Y - clear. |
| 901 | handle == X:0 - root class. |
| 902 | */ |
| 903 | |
| 904 | /* Step 1. Determine qdisc handle X:0 */ |
| 905 | |
| 906 | if (pid != TC_H_ROOT) { |
| 907 | u32 qid1 = TC_H_MAJ(pid); |
| 908 | |
| 909 | if (qid && qid1) { |
| 910 | /* If both majors are known, they must be identical. */ |
| 911 | if (qid != qid1) |
| 912 | return -EINVAL; |
| 913 | } else if (qid1) { |
| 914 | qid = qid1; |
| 915 | } else if (qid == 0) |
| 916 | qid = dev->qdisc_sleeping->handle; |
| 917 | |
| 918 | /* Now qid is genuine qdisc handle consistent |
| 919 | both with parent and child. |
| 920 | |
| 921 | TC_H_MAJ(pid) still may be unspecified, complete it now. |
| 922 | */ |
| 923 | if (pid) |
| 924 | pid = TC_H_MAKE(qid, pid); |
| 925 | } else { |
| 926 | if (qid == 0) |
| 927 | qid = dev->qdisc_sleeping->handle; |
| 928 | } |
| 929 | |
| 930 | /* OK. Locate qdisc */ |
| 931 | if ((q = qdisc_lookup(dev, qid)) == NULL) |
| 932 | return -ENOENT; |
| 933 | |
| 934 | /* An check that it supports classes */ |
| 935 | cops = q->ops->cl_ops; |
| 936 | if (cops == NULL) |
| 937 | return -EINVAL; |
| 938 | |
| 939 | /* Now try to get class */ |
| 940 | if (clid == 0) { |
| 941 | if (pid == TC_H_ROOT) |
| 942 | clid = qid; |
| 943 | } else |
| 944 | clid = TC_H_MAKE(qid, clid); |
| 945 | |
| 946 | if (clid) |
| 947 | cl = cops->get(q, clid); |
| 948 | |
| 949 | if (cl == 0) { |
| 950 | err = -ENOENT; |
| 951 | if (n->nlmsg_type != RTM_NEWTCLASS || !(n->nlmsg_flags&NLM_F_CREATE)) |
| 952 | goto out; |
| 953 | } else { |
| 954 | switch (n->nlmsg_type) { |
| 955 | case RTM_NEWTCLASS: |
| 956 | err = -EEXIST; |
| 957 | if (n->nlmsg_flags&NLM_F_EXCL) |
| 958 | goto out; |
| 959 | break; |
| 960 | case RTM_DELTCLASS: |
| 961 | err = cops->delete(q, cl); |
| 962 | if (err == 0) |
| 963 | tclass_notify(skb, n, q, cl, RTM_DELTCLASS); |
| 964 | goto out; |
| 965 | case RTM_GETTCLASS: |
| 966 | err = tclass_notify(skb, n, q, cl, RTM_NEWTCLASS); |
| 967 | goto out; |
| 968 | default: |
| 969 | err = -EINVAL; |
| 970 | goto out; |
| 971 | } |
| 972 | } |
| 973 | |
| 974 | new_cl = cl; |
| 975 | err = cops->change(q, clid, pid, tca, &new_cl); |
| 976 | if (err == 0) |
| 977 | tclass_notify(skb, n, q, new_cl, RTM_NEWTCLASS); |
| 978 | |
| 979 | out: |
| 980 | if (cl) |
| 981 | cops->put(q, cl); |
| 982 | |
| 983 | return err; |
| 984 | } |
| 985 | |
| 986 | |
| 987 | static int tc_fill_tclass(struct sk_buff *skb, struct Qdisc *q, |
| 988 | unsigned long cl, |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 989 | u32 pid, u32 seq, u16 flags, int event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | { |
| 991 | struct tcmsg *tcm; |
| 992 | struct nlmsghdr *nlh; |
| 993 | unsigned char *b = skb->tail; |
| 994 | struct gnet_dump d; |
| 995 | struct Qdisc_class_ops *cl_ops = q->ops->cl_ops; |
| 996 | |
Jamal Hadi Salim | e431b8c | 2005-06-18 22:55:31 -0700 | [diff] [blame] | 997 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*tcm), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | tcm = NLMSG_DATA(nlh); |
| 999 | tcm->tcm_family = AF_UNSPEC; |
| 1000 | tcm->tcm_ifindex = q->dev->ifindex; |
| 1001 | tcm->tcm_parent = q->handle; |
| 1002 | tcm->tcm_handle = q->handle; |
| 1003 | tcm->tcm_info = 0; |
| 1004 | RTA_PUT(skb, TCA_KIND, IFNAMSIZ, q->ops->id); |
| 1005 | if (cl_ops->dump && cl_ops->dump(q, cl, skb, tcm) < 0) |
| 1006 | goto rtattr_failure; |
| 1007 | |
| 1008 | if (gnet_stats_start_copy_compat(skb, TCA_STATS2, TCA_STATS, |
| 1009 | TCA_XSTATS, q->stats_lock, &d) < 0) |
| 1010 | goto rtattr_failure; |
| 1011 | |
| 1012 | if (cl_ops->dump_stats && cl_ops->dump_stats(q, cl, &d) < 0) |
| 1013 | goto rtattr_failure; |
| 1014 | |
| 1015 | if (gnet_stats_finish_copy(&d) < 0) |
| 1016 | goto rtattr_failure; |
| 1017 | |
| 1018 | nlh->nlmsg_len = skb->tail - b; |
| 1019 | return skb->len; |
| 1020 | |
| 1021 | nlmsg_failure: |
| 1022 | rtattr_failure: |
| 1023 | skb_trim(skb, b - skb->data); |
| 1024 | return -1; |
| 1025 | } |
| 1026 | |
| 1027 | static int tclass_notify(struct sk_buff *oskb, struct nlmsghdr *n, |
| 1028 | struct Qdisc *q, unsigned long cl, int event) |
| 1029 | { |
| 1030 | struct sk_buff *skb; |
| 1031 | u32 pid = oskb ? NETLINK_CB(oskb).pid : 0; |
| 1032 | |
| 1033 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1034 | if (!skb) |
| 1035 | return -ENOBUFS; |
| 1036 | |
| 1037 | if (tc_fill_tclass(skb, q, cl, pid, n->nlmsg_seq, 0, event) < 0) { |
| 1038 | kfree_skb(skb); |
| 1039 | return -EINVAL; |
| 1040 | } |
| 1041 | |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1042 | return rtnetlink_send(skb, pid, RTNLGRP_TC, n->nlmsg_flags&NLM_F_ECHO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | } |
| 1044 | |
| 1045 | struct qdisc_dump_args |
| 1046 | { |
| 1047 | struct qdisc_walker w; |
| 1048 | struct sk_buff *skb; |
| 1049 | struct netlink_callback *cb; |
| 1050 | }; |
| 1051 | |
| 1052 | static int qdisc_class_dump(struct Qdisc *q, unsigned long cl, struct qdisc_walker *arg) |
| 1053 | { |
| 1054 | struct qdisc_dump_args *a = (struct qdisc_dump_args *)arg; |
| 1055 | |
| 1056 | return tc_fill_tclass(a->skb, q, cl, NETLINK_CB(a->cb->skb).pid, |
| 1057 | a->cb->nlh->nlmsg_seq, NLM_F_MULTI, RTM_NEWTCLASS); |
| 1058 | } |
| 1059 | |
| 1060 | static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb) |
| 1061 | { |
| 1062 | int t; |
| 1063 | int s_t; |
| 1064 | struct net_device *dev; |
| 1065 | struct Qdisc *q; |
| 1066 | struct tcmsg *tcm = (struct tcmsg*)NLMSG_DATA(cb->nlh); |
| 1067 | struct qdisc_dump_args arg; |
| 1068 | |
| 1069 | if (cb->nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*tcm))) |
| 1070 | return 0; |
| 1071 | if ((dev = dev_get_by_index(tcm->tcm_ifindex)) == NULL) |
| 1072 | return 0; |
| 1073 | |
| 1074 | s_t = cb->args[0]; |
| 1075 | t = 0; |
| 1076 | |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 1077 | read_lock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | list_for_each_entry(q, &dev->qdisc_list, list) { |
| 1079 | if (t < s_t || !q->ops->cl_ops || |
| 1080 | (tcm->tcm_parent && |
| 1081 | TC_H_MAJ(tcm->tcm_parent) != q->handle)) { |
| 1082 | t++; |
| 1083 | continue; |
| 1084 | } |
| 1085 | if (t > s_t) |
| 1086 | memset(&cb->args[1], 0, sizeof(cb->args)-sizeof(cb->args[0])); |
| 1087 | arg.w.fn = qdisc_class_dump; |
| 1088 | arg.skb = skb; |
| 1089 | arg.cb = cb; |
| 1090 | arg.w.stop = 0; |
| 1091 | arg.w.skip = cb->args[1]; |
| 1092 | arg.w.count = 0; |
| 1093 | q->ops->cl_ops->walk(q, &arg.w); |
| 1094 | cb->args[1] = arg.w.count; |
| 1095 | if (arg.w.stop) |
| 1096 | break; |
| 1097 | t++; |
| 1098 | } |
Patrick McHardy | 85670cc | 2006-09-27 16:45:45 -0700 | [diff] [blame] | 1099 | read_unlock(&qdisc_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | |
| 1101 | cb->args[0] = t; |
| 1102 | |
| 1103 | dev_put(dev); |
| 1104 | return skb->len; |
| 1105 | } |
| 1106 | |
| 1107 | /* Main classifier routine: scans classifier chain attached |
| 1108 | to this qdisc, (optionally) tests for protocol and asks |
| 1109 | specific classifiers. |
| 1110 | */ |
| 1111 | int tc_classify(struct sk_buff *skb, struct tcf_proto *tp, |
| 1112 | struct tcf_result *res) |
| 1113 | { |
| 1114 | int err = 0; |
| 1115 | u32 protocol = skb->protocol; |
| 1116 | #ifdef CONFIG_NET_CLS_ACT |
| 1117 | struct tcf_proto *otp = tp; |
| 1118 | reclassify: |
| 1119 | #endif |
| 1120 | protocol = skb->protocol; |
| 1121 | |
| 1122 | for ( ; tp; tp = tp->next) { |
| 1123 | if ((tp->protocol == protocol || |
| 1124 | tp->protocol == __constant_htons(ETH_P_ALL)) && |
| 1125 | (err = tp->classify(skb, tp, res)) >= 0) { |
| 1126 | #ifdef CONFIG_NET_CLS_ACT |
| 1127 | if ( TC_ACT_RECLASSIFY == err) { |
| 1128 | __u32 verd = (__u32) G_TC_VERD(skb->tc_verd); |
| 1129 | tp = otp; |
| 1130 | |
| 1131 | if (MAX_REC_LOOP < verd++) { |
| 1132 | printk("rule prio %d protocol %02x reclassify is buggy packet dropped\n", |
| 1133 | tp->prio&0xffff, ntohs(tp->protocol)); |
| 1134 | return TC_ACT_SHOT; |
| 1135 | } |
| 1136 | skb->tc_verd = SET_TC_VERD(skb->tc_verd,verd); |
| 1137 | goto reclassify; |
| 1138 | } else { |
| 1139 | if (skb->tc_verd) |
| 1140 | skb->tc_verd = SET_TC_VERD(skb->tc_verd,0); |
| 1141 | return err; |
| 1142 | } |
| 1143 | #else |
| 1144 | |
| 1145 | return err; |
| 1146 | #endif |
| 1147 | } |
| 1148 | |
| 1149 | } |
| 1150 | return -1; |
| 1151 | } |
| 1152 | |
| 1153 | static int psched_us_per_tick = 1; |
| 1154 | static int psched_tick_per_us = 1; |
| 1155 | |
| 1156 | #ifdef CONFIG_PROC_FS |
| 1157 | static int psched_show(struct seq_file *seq, void *v) |
| 1158 | { |
| 1159 | seq_printf(seq, "%08x %08x %08x %08x\n", |
| 1160 | psched_tick_per_us, psched_us_per_tick, |
| 1161 | 1000000, HZ); |
| 1162 | |
| 1163 | return 0; |
| 1164 | } |
| 1165 | |
| 1166 | static int psched_open(struct inode *inode, struct file *file) |
| 1167 | { |
| 1168 | return single_open(file, psched_show, PDE(inode)->data); |
| 1169 | } |
| 1170 | |
| 1171 | static struct file_operations psched_fops = { |
| 1172 | .owner = THIS_MODULE, |
| 1173 | .open = psched_open, |
| 1174 | .read = seq_read, |
| 1175 | .llseek = seq_lseek, |
| 1176 | .release = single_release, |
| 1177 | }; |
| 1178 | #endif |
| 1179 | |
| 1180 | #ifdef CONFIG_NET_SCH_CLK_CPU |
| 1181 | psched_tdiff_t psched_clock_per_hz; |
| 1182 | int psched_clock_scale; |
| 1183 | EXPORT_SYMBOL(psched_clock_per_hz); |
| 1184 | EXPORT_SYMBOL(psched_clock_scale); |
| 1185 | |
| 1186 | psched_time_t psched_time_base; |
| 1187 | cycles_t psched_time_mark; |
| 1188 | EXPORT_SYMBOL(psched_time_mark); |
| 1189 | EXPORT_SYMBOL(psched_time_base); |
| 1190 | |
| 1191 | /* |
| 1192 | * Periodically adjust psched_time_base to avoid overflow |
| 1193 | * with 32-bit get_cycles(). Safe up to 4GHz CPU. |
| 1194 | */ |
| 1195 | static void psched_tick(unsigned long); |
Ingo Molnar | 8d06afa | 2005-09-09 13:10:40 -0700 | [diff] [blame] | 1196 | static DEFINE_TIMER(psched_timer, psched_tick, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
| 1198 | static void psched_tick(unsigned long dummy) |
| 1199 | { |
| 1200 | if (sizeof(cycles_t) == sizeof(u32)) { |
| 1201 | psched_time_t dummy_stamp; |
| 1202 | PSCHED_GET_TIME(dummy_stamp); |
| 1203 | psched_timer.expires = jiffies + 1*HZ; |
| 1204 | add_timer(&psched_timer); |
| 1205 | } |
| 1206 | } |
| 1207 | |
| 1208 | int __init psched_calibrate_clock(void) |
| 1209 | { |
| 1210 | psched_time_t stamp, stamp1; |
| 1211 | struct timeval tv, tv1; |
| 1212 | psched_tdiff_t delay; |
| 1213 | long rdelay; |
| 1214 | unsigned long stop; |
| 1215 | |
| 1216 | psched_tick(0); |
| 1217 | stop = jiffies + HZ/10; |
| 1218 | PSCHED_GET_TIME(stamp); |
| 1219 | do_gettimeofday(&tv); |
| 1220 | while (time_before(jiffies, stop)) { |
| 1221 | barrier(); |
| 1222 | cpu_relax(); |
| 1223 | } |
| 1224 | PSCHED_GET_TIME(stamp1); |
| 1225 | do_gettimeofday(&tv1); |
| 1226 | |
| 1227 | delay = PSCHED_TDIFF(stamp1, stamp); |
| 1228 | rdelay = tv1.tv_usec - tv.tv_usec; |
| 1229 | rdelay += (tv1.tv_sec - tv.tv_sec)*1000000; |
| 1230 | if (rdelay > delay) |
| 1231 | return -1; |
| 1232 | delay /= rdelay; |
| 1233 | psched_tick_per_us = delay; |
| 1234 | while ((delay>>=1) != 0) |
| 1235 | psched_clock_scale++; |
| 1236 | psched_us_per_tick = 1<<psched_clock_scale; |
| 1237 | psched_clock_per_hz = (psched_tick_per_us*(1000000/HZ))>>psched_clock_scale; |
| 1238 | return 0; |
| 1239 | } |
| 1240 | #endif |
| 1241 | |
| 1242 | static int __init pktsched_init(void) |
| 1243 | { |
| 1244 | struct rtnetlink_link *link_p; |
| 1245 | |
| 1246 | #ifdef CONFIG_NET_SCH_CLK_CPU |
| 1247 | if (psched_calibrate_clock() < 0) |
| 1248 | return -1; |
| 1249 | #elif defined(CONFIG_NET_SCH_CLK_JIFFIES) |
| 1250 | psched_tick_per_us = HZ<<PSCHED_JSCALE; |
| 1251 | psched_us_per_tick = 1000000; |
| 1252 | #endif |
| 1253 | |
| 1254 | link_p = rtnetlink_links[PF_UNSPEC]; |
| 1255 | |
| 1256 | /* Setup rtnetlink links. It is made here to avoid |
| 1257 | exporting large number of public symbols. |
| 1258 | */ |
| 1259 | |
| 1260 | if (link_p) { |
| 1261 | link_p[RTM_NEWQDISC-RTM_BASE].doit = tc_modify_qdisc; |
| 1262 | link_p[RTM_DELQDISC-RTM_BASE].doit = tc_get_qdisc; |
| 1263 | link_p[RTM_GETQDISC-RTM_BASE].doit = tc_get_qdisc; |
| 1264 | link_p[RTM_GETQDISC-RTM_BASE].dumpit = tc_dump_qdisc; |
| 1265 | link_p[RTM_NEWTCLASS-RTM_BASE].doit = tc_ctl_tclass; |
| 1266 | link_p[RTM_DELTCLASS-RTM_BASE].doit = tc_ctl_tclass; |
| 1267 | link_p[RTM_GETTCLASS-RTM_BASE].doit = tc_ctl_tclass; |
| 1268 | link_p[RTM_GETTCLASS-RTM_BASE].dumpit = tc_dump_tclass; |
| 1269 | } |
| 1270 | |
| 1271 | register_qdisc(&pfifo_qdisc_ops); |
| 1272 | register_qdisc(&bfifo_qdisc_ops); |
| 1273 | proc_net_fops_create("psched", 0, &psched_fops); |
| 1274 | |
| 1275 | return 0; |
| 1276 | } |
| 1277 | |
| 1278 | subsys_initcall(pktsched_init); |
| 1279 | |
Stephen Hemminger | d5d75cd | 2005-05-03 16:24:57 -0700 | [diff] [blame] | 1280 | EXPORT_SYMBOL(qdisc_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | EXPORT_SYMBOL(qdisc_get_rtab); |
| 1282 | EXPORT_SYMBOL(qdisc_put_rtab); |
| 1283 | EXPORT_SYMBOL(register_qdisc); |
| 1284 | EXPORT_SYMBOL(unregister_qdisc); |
| 1285 | EXPORT_SYMBOL(tc_classify); |