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114#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
115
116#include <linux/capability.h>
117#include <linux/module.h>
118#include <linux/kernel.h>
119#include <linux/init.h>
120#include <linux/slab.h>
121#include <linux/timer.h>
122#include <linux/netdevice.h>
123#include <net/net_namespace.h>
124
125#include <linux/if.h>
126#include <linux/if_arp.h>
127#include <linux/if_eql.h>
128
129#include <asm/uaccess.h>
130
131static int eql_open(struct net_device *dev);
132static int eql_close(struct net_device *dev);
133static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
134static netdev_tx_t eql_slave_xmit(struct sk_buff *skb, struct net_device *dev);
135
136#define eql_is_slave(dev) ((dev->flags & IFF_SLAVE) == IFF_SLAVE)
137#define eql_is_master(dev) ((dev->flags & IFF_MASTER) == IFF_MASTER)
138
139static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave);
140
141static void eql_timer(unsigned long param)
142{
143 equalizer_t *eql = (equalizer_t *) param;
144 struct list_head *this, *tmp, *head;
145
146 spin_lock_bh(&eql->queue.lock);
147 head = &eql->queue.all_slaves;
148 list_for_each_safe(this, tmp, head) {
149 slave_t *slave = list_entry(this, slave_t, list);
150
151 if ((slave->dev->flags & IFF_UP) == IFF_UP) {
152 slave->bytes_queued -= slave->priority_Bps;
153 if (slave->bytes_queued < 0)
154 slave->bytes_queued = 0;
155 } else {
156 eql_kill_one_slave(&eql->queue, slave);
157 }
158
159 }
160 spin_unlock_bh(&eql->queue.lock);
161
162 eql->timer.expires = jiffies + EQL_DEFAULT_RESCHED_IVAL;
163 add_timer(&eql->timer);
164}
165
166static const char version[] __initconst =
167 "Equalizer2002: Simon Janes (simon@ncm.com) and David S. Miller (davem@redhat.com)";
168
169static const struct net_device_ops eql_netdev_ops = {
170 .ndo_open = eql_open,
171 .ndo_stop = eql_close,
172 .ndo_do_ioctl = eql_ioctl,
173 .ndo_start_xmit = eql_slave_xmit,
174};
175
176static void __init eql_setup(struct net_device *dev)
177{
178 equalizer_t *eql = netdev_priv(dev);
179
180 init_timer(&eql->timer);
181 eql->timer.data = (unsigned long) eql;
182 eql->timer.expires = jiffies + EQL_DEFAULT_RESCHED_IVAL;
183 eql->timer.function = eql_timer;
184
185 spin_lock_init(&eql->queue.lock);
186 INIT_LIST_HEAD(&eql->queue.all_slaves);
187 eql->queue.master_dev = dev;
188
189 dev->netdev_ops = &eql_netdev_ops;
190
191
192
193
194
195
196 dev->mtu = EQL_DEFAULT_MTU;
197 dev->flags = IFF_MASTER;
198
199 dev->type = ARPHRD_SLIP;
200 dev->tx_queue_len = 5;
201 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
202}
203
204static int eql_open(struct net_device *dev)
205{
206 equalizer_t *eql = netdev_priv(dev);
207
208
209 netdev_info(dev,
210 "remember to turn off Van-Jacobson compression on your slave devices\n");
211
212 BUG_ON(!list_empty(&eql->queue.all_slaves));
213
214 eql->min_slaves = 1;
215 eql->max_slaves = EQL_DEFAULT_MAX_SLAVES;
216
217 add_timer(&eql->timer);
218
219 return 0;
220}
221
222static void eql_kill_one_slave(slave_queue_t *queue, slave_t *slave)
223{
224 list_del(&slave->list);
225 queue->num_slaves--;
226 slave->dev->flags &= ~IFF_SLAVE;
227 dev_put(slave->dev);
228 kfree(slave);
229}
230
231static void eql_kill_slave_queue(slave_queue_t *queue)
232{
233 struct list_head *head, *tmp, *this;
234
235 spin_lock_bh(&queue->lock);
236
237 head = &queue->all_slaves;
238 list_for_each_safe(this, tmp, head) {
239 slave_t *s = list_entry(this, slave_t, list);
240
241 eql_kill_one_slave(queue, s);
242 }
243
244 spin_unlock_bh(&queue->lock);
245}
246
247static int eql_close(struct net_device *dev)
248{
249 equalizer_t *eql = netdev_priv(dev);
250
251
252
253
254
255
256 del_timer_sync(&eql->timer);
257
258 eql_kill_slave_queue(&eql->queue);
259
260 return 0;
261}
262
263static int eql_enslave(struct net_device *dev, slaving_request_t __user *srq);
264static int eql_emancipate(struct net_device *dev, slaving_request_t __user *srq);
265
266static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
267static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *sc);
268
269static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mc);
270static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mc);
271
272static int eql_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
273{
274 if (cmd != EQL_GETMASTRCFG && cmd != EQL_GETSLAVECFG &&
275 !capable(CAP_NET_ADMIN))
276 return -EPERM;
277
278 switch (cmd) {
279 case EQL_ENSLAVE:
280 return eql_enslave(dev, ifr->ifr_data);
281 case EQL_EMANCIPATE:
282 return eql_emancipate(dev, ifr->ifr_data);
283 case EQL_GETSLAVECFG:
284 return eql_g_slave_cfg(dev, ifr->ifr_data);
285 case EQL_SETSLAVECFG:
286 return eql_s_slave_cfg(dev, ifr->ifr_data);
287 case EQL_GETMASTRCFG:
288 return eql_g_master_cfg(dev, ifr->ifr_data);
289 case EQL_SETMASTRCFG:
290 return eql_s_master_cfg(dev, ifr->ifr_data);
291 default:
292 return -EOPNOTSUPP;
293 }
294}
295
296
297static slave_t *__eql_schedule_slaves(slave_queue_t *queue)
298{
299 unsigned long best_load = ~0UL;
300 struct list_head *this, *tmp, *head;
301 slave_t *best_slave;
302
303 best_slave = NULL;
304
305
306 head = &queue->all_slaves;
307 list_for_each_safe(this, tmp, head) {
308 slave_t *slave = list_entry(this, slave_t, list);
309 unsigned long slave_load, bytes_queued, priority_Bps;
310
311
312
313
314 bytes_queued = slave->bytes_queued;
315 priority_Bps = slave->priority_Bps;
316 if ((slave->dev->flags & IFF_UP) == IFF_UP) {
317 slave_load = (~0UL - (~0UL / 2)) -
318 (priority_Bps) + bytes_queued * 8;
319
320 if (slave_load < best_load) {
321 best_load = slave_load;
322 best_slave = slave;
323 }
324 } else {
325
326 eql_kill_one_slave(queue, slave);
327 }
328 }
329 return best_slave;
330}
331
332static netdev_tx_t eql_slave_xmit(struct sk_buff *skb, struct net_device *dev)
333{
334 equalizer_t *eql = netdev_priv(dev);
335 slave_t *slave;
336
337 spin_lock(&eql->queue.lock);
338
339 slave = __eql_schedule_slaves(&eql->queue);
340 if (slave) {
341 struct net_device *slave_dev = slave->dev;
342
343 skb->dev = slave_dev;
344 skb->priority = 1;
345 slave->bytes_queued += skb->len;
346 dev_queue_xmit(skb);
347 dev->stats.tx_packets++;
348 } else {
349 dev->stats.tx_dropped++;
350 dev_kfree_skb(skb);
351 }
352
353 spin_unlock(&eql->queue.lock);
354
355 return NETDEV_TX_OK;
356}
357
358
359
360
361
362
363static slave_t *__eql_find_slave_dev(slave_queue_t *queue, struct net_device *dev)
364{
365 struct list_head *this, *head;
366
367 head = &queue->all_slaves;
368 list_for_each(this, head) {
369 slave_t *slave = list_entry(this, slave_t, list);
370
371 if (slave->dev == dev)
372 return slave;
373 }
374
375 return NULL;
376}
377
378static inline int eql_is_full(slave_queue_t *queue)
379{
380 equalizer_t *eql = netdev_priv(queue->master_dev);
381
382 if (queue->num_slaves >= eql->max_slaves)
383 return 1;
384 return 0;
385}
386
387
388static int __eql_insert_slave(slave_queue_t *queue, slave_t *slave)
389{
390 if (!eql_is_full(queue)) {
391 slave_t *duplicate_slave = NULL;
392
393 duplicate_slave = __eql_find_slave_dev(queue, slave->dev);
394 if (duplicate_slave)
395 eql_kill_one_slave(queue, duplicate_slave);
396
397 list_add(&slave->list, &queue->all_slaves);
398 queue->num_slaves++;
399 slave->dev->flags |= IFF_SLAVE;
400
401 return 0;
402 }
403
404 return -ENOSPC;
405}
406
407static int eql_enslave(struct net_device *master_dev, slaving_request_t __user *srqp)
408{
409 struct net_device *slave_dev;
410 slaving_request_t srq;
411
412 if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
413 return -EFAULT;
414
415 slave_dev = dev_get_by_name(&init_net, srq.slave_name);
416 if (slave_dev) {
417 if ((master_dev->flags & IFF_UP) == IFF_UP) {
418
419 if (!eql_is_master(slave_dev) &&
420 !eql_is_slave(slave_dev)) {
421 slave_t *s = kmalloc(sizeof(*s), GFP_KERNEL);
422 equalizer_t *eql = netdev_priv(master_dev);
423 int ret;
424
425 if (!s) {
426 dev_put(slave_dev);
427 return -ENOMEM;
428 }
429
430 memset(s, 0, sizeof(*s));
431 s->dev = slave_dev;
432 s->priority = srq.priority;
433 s->priority_bps = srq.priority;
434 s->priority_Bps = srq.priority / 8;
435
436 spin_lock_bh(&eql->queue.lock);
437 ret = __eql_insert_slave(&eql->queue, s);
438 if (ret) {
439 dev_put(slave_dev);
440 kfree(s);
441 }
442 spin_unlock_bh(&eql->queue.lock);
443
444 return ret;
445 }
446 }
447 dev_put(slave_dev);
448 }
449
450 return -EINVAL;
451}
452
453static int eql_emancipate(struct net_device *master_dev, slaving_request_t __user *srqp)
454{
455 equalizer_t *eql = netdev_priv(master_dev);
456 struct net_device *slave_dev;
457 slaving_request_t srq;
458 int ret;
459
460 if (copy_from_user(&srq, srqp, sizeof (slaving_request_t)))
461 return -EFAULT;
462
463 slave_dev = dev_get_by_name(&init_net, srq.slave_name);
464 ret = -EINVAL;
465 if (slave_dev) {
466 spin_lock_bh(&eql->queue.lock);
467
468 if (eql_is_slave(slave_dev)) {
469 slave_t *slave = __eql_find_slave_dev(&eql->queue,
470 slave_dev);
471
472 if (slave) {
473 eql_kill_one_slave(&eql->queue, slave);
474 ret = 0;
475 }
476 }
477 dev_put(slave_dev);
478
479 spin_unlock_bh(&eql->queue.lock);
480 }
481
482 return ret;
483}
484
485static int eql_g_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
486{
487 equalizer_t *eql = netdev_priv(dev);
488 slave_t *slave;
489 struct net_device *slave_dev;
490 slave_config_t sc;
491 int ret;
492
493 if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
494 return -EFAULT;
495
496 slave_dev = dev_get_by_name(&init_net, sc.slave_name);
497 if (!slave_dev)
498 return -ENODEV;
499
500 ret = -EINVAL;
501
502 spin_lock_bh(&eql->queue.lock);
503 if (eql_is_slave(slave_dev)) {
504 slave = __eql_find_slave_dev(&eql->queue, slave_dev);
505 if (slave) {
506 sc.priority = slave->priority;
507 ret = 0;
508 }
509 }
510 spin_unlock_bh(&eql->queue.lock);
511
512 dev_put(slave_dev);
513
514 if (!ret && copy_to_user(scp, &sc, sizeof (slave_config_t)))
515 ret = -EFAULT;
516
517 return ret;
518}
519
520static int eql_s_slave_cfg(struct net_device *dev, slave_config_t __user *scp)
521{
522 slave_t *slave;
523 equalizer_t *eql;
524 struct net_device *slave_dev;
525 slave_config_t sc;
526 int ret;
527
528 if (copy_from_user(&sc, scp, sizeof (slave_config_t)))
529 return -EFAULT;
530
531 slave_dev = dev_get_by_name(&init_net, sc.slave_name);
532 if (!slave_dev)
533 return -ENODEV;
534
535 ret = -EINVAL;
536
537 eql = netdev_priv(dev);
538 spin_lock_bh(&eql->queue.lock);
539 if (eql_is_slave(slave_dev)) {
540 slave = __eql_find_slave_dev(&eql->queue, slave_dev);
541 if (slave) {
542 slave->priority = sc.priority;
543 slave->priority_bps = sc.priority;
544 slave->priority_Bps = sc.priority / 8;
545 ret = 0;
546 }
547 }
548 spin_unlock_bh(&eql->queue.lock);
549
550 dev_put(slave_dev);
551
552 return ret;
553}
554
555static int eql_g_master_cfg(struct net_device *dev, master_config_t __user *mcp)
556{
557 equalizer_t *eql;
558 master_config_t mc;
559
560 memset(&mc, 0, sizeof(master_config_t));
561
562 if (eql_is_master(dev)) {
563 eql = netdev_priv(dev);
564 mc.max_slaves = eql->max_slaves;
565 mc.min_slaves = eql->min_slaves;
566 if (copy_to_user(mcp, &mc, sizeof (master_config_t)))
567 return -EFAULT;
568 return 0;
569 }
570 return -EINVAL;
571}
572
573static int eql_s_master_cfg(struct net_device *dev, master_config_t __user *mcp)
574{
575 equalizer_t *eql;
576 master_config_t mc;
577
578 if (copy_from_user(&mc, mcp, sizeof (master_config_t)))
579 return -EFAULT;
580
581 if (eql_is_master(dev)) {
582 eql = netdev_priv(dev);
583 eql->max_slaves = mc.max_slaves;
584 eql->min_slaves = mc.min_slaves;
585 return 0;
586 }
587 return -EINVAL;
588}
589
590static struct net_device *dev_eql;
591
592static int __init eql_init_module(void)
593{
594 int err;
595
596 pr_info("%s\n", version);
597
598 dev_eql = alloc_netdev(sizeof(equalizer_t), "eql", eql_setup);
599 if (!dev_eql)
600 return -ENOMEM;
601
602 err = register_netdev(dev_eql);
603 if (err)
604 free_netdev(dev_eql);
605 return err;
606}
607
608static void __exit eql_cleanup_module(void)
609{
610 unregister_netdev(dev_eql);
611 free_netdev(dev_eql);
612}
613
614module_init(eql_init_module);
615module_exit(eql_cleanup_module);
616MODULE_LICENSE("GPL");
617