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1da177e4 LT |
1 | /* |
2 | * Simple traffic shaper for Linux NET3. | |
3 | * | |
4 | * (c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved. | |
5 | * http://www.redhat.com | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * as published by the Free Software Foundation; either version | |
10 | * 2 of the License, or (at your option) any later version. | |
11 | * | |
12 | * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide | |
13 | * warranty for any of this software. This material is provided | |
14 | * "AS-IS" and at no charge. | |
15 | * | |
16 | * | |
17 | * Algorithm: | |
18 | * | |
19 | * Queue Frame: | |
20 | * Compute time length of frame at regulated speed | |
21 | * Add frame to queue at appropriate point | |
22 | * Adjust time length computation for followup frames | |
23 | * Any frame that falls outside of its boundaries is freed | |
24 | * | |
25 | * We work to the following constants | |
26 | * | |
27 | * SHAPER_QLEN Maximum queued frames | |
28 | * SHAPER_LATENCY Bounding latency on a frame. Leaving this latency | |
29 | * window drops the frame. This stops us queueing | |
30 | * frames for a long time and confusing a remote | |
31 | * host. | |
32 | * SHAPER_MAXSLIP Maximum time a priority frame may jump forward. | |
33 | * That bounds the penalty we will inflict on low | |
34 | * priority traffic. | |
35 | * SHAPER_BURST Time range we call "now" in order to reduce | |
36 | * system load. The more we make this the burstier | |
37 | * the behaviour, the better local performance you | |
38 | * get through packet clustering on routers and the | |
39 | * worse the remote end gets to judge rtts. | |
40 | * | |
41 | * This is designed to handle lower speed links ( < 200K/second or so). We | |
42 | * run off a 100-150Hz base clock typically. This gives us a resolution at | |
43 | * 200Kbit/second of about 2Kbit or 256 bytes. Above that our timer | |
44 | * resolution may start to cause much more burstiness in the traffic. We | |
45 | * could avoid a lot of that by calling kick_shaper() at the end of the | |
46 | * tied device transmissions. If you run above about 100K second you | |
47 | * may need to tune the supposed speed rate for the right values. | |
48 | * | |
49 | * BUGS: | |
50 | * Downing the interface under the shaper before the shaper | |
51 | * will render your machine defunct. Don't for now shape over | |
52 | * PPP or SLIP therefore! | |
53 | * This will be fixed in BETA4 | |
54 | * | |
55 | * Update History : | |
56 | * | |
57 | * bh_atomic() SMP races fixes and rewritten the locking code to | |
58 | * be SMP safe and irq-mask friendly. | |
59 | * NOTE: we can't use start_bh_atomic() in kick_shaper() | |
60 | * because it's going to be recalled from an irq handler, | |
61 | * and synchronize_bh() is a nono if called from irq context. | |
62 | * 1999 Andrea Arcangeli | |
63 | * | |
64 | * Device statistics (tx_pakets, tx_bytes, | |
65 | * tx_drops: queue_over_time and collisions: max_queue_exceded) | |
66 | * 1999/06/18 Jordi Murgo <savage@apostols.org> | |
67 | * | |
68 | * Use skb->cb for private data. | |
69 | * 2000/03 Andi Kleen | |
70 | */ | |
71 | ||
72 | #include <linux/config.h> | |
73 | #include <linux/module.h> | |
74 | #include <linux/kernel.h> | |
75 | #include <linux/fcntl.h> | |
76 | #include <linux/mm.h> | |
77 | #include <linux/slab.h> | |
78 | #include <linux/string.h> | |
79 | #include <linux/errno.h> | |
80 | #include <linux/netdevice.h> | |
81 | #include <linux/etherdevice.h> | |
82 | #include <linux/skbuff.h> | |
83 | #include <linux/if_arp.h> | |
84 | #include <linux/init.h> | |
85 | #include <linux/if_shaper.h> | |
86 | ||
87 | #include <net/dst.h> | |
88 | #include <net/arp.h> | |
89 | ||
90 | struct shaper_cb { | |
91 | unsigned long shapeclock; /* Time it should go out */ | |
92 | unsigned long shapestamp; /* Stamp for shaper */ | |
93 | __u32 shapelatency; /* Latency on frame */ | |
94 | __u32 shapelen; /* Frame length in clocks */ | |
95 | __u16 shapepend; /* Pending */ | |
96 | }; | |
97 | #define SHAPERCB(skb) ((struct shaper_cb *) ((skb)->cb)) | |
98 | ||
99 | static int sh_debug; /* Debug flag */ | |
100 | ||
101 | #define SHAPER_BANNER "CymruNet Traffic Shaper BETA 0.04 for Linux 2.1\n" | |
102 | ||
1da177e4 LT |
103 | static void shaper_kick(struct shaper *sh); |
104 | ||
1da177e4 LT |
105 | /* |
106 | * Compute clocks on a buffer | |
107 | */ | |
108 | ||
109 | static int shaper_clocks(struct shaper *shaper, struct sk_buff *skb) | |
110 | { | |
111 | int t=skb->len/shaper->bytespertick; | |
112 | return t; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Set the speed of a shaper. We compute this in bytes per tick since | |
117 | * thats how the machine wants to run. Quoted input is in bits per second | |
118 | * as is traditional (note not BAUD). We assume 8 bit bytes. | |
119 | */ | |
120 | ||
121 | static void shaper_setspeed(struct shaper *shaper, int bitspersec) | |
122 | { | |
123 | shaper->bitspersec=bitspersec; | |
124 | shaper->bytespertick=(bitspersec/HZ)/8; | |
125 | if(!shaper->bytespertick) | |
126 | shaper->bytespertick++; | |
127 | } | |
128 | ||
129 | /* | |
130 | * Throw a frame at a shaper. | |
131 | */ | |
132 | ||
b597ef47 CH |
133 | |
134 | static int shaper_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
1da177e4 | 135 | { |
b597ef47 | 136 | struct shaper *shaper = dev->priv; |
1da177e4 | 137 | struct sk_buff *ptr; |
bc971dee CH |
138 | |
139 | spin_lock(&shaper->lock); | |
1da177e4 LT |
140 | ptr=shaper->sendq.prev; |
141 | ||
142 | /* | |
143 | * Set up our packet details | |
144 | */ | |
145 | ||
146 | SHAPERCB(skb)->shapelatency=0; | |
147 | SHAPERCB(skb)->shapeclock=shaper->recovery; | |
148 | if(time_before(SHAPERCB(skb)->shapeclock, jiffies)) | |
149 | SHAPERCB(skb)->shapeclock=jiffies; | |
150 | skb->priority=0; /* short term bug fix */ | |
151 | SHAPERCB(skb)->shapestamp=jiffies; | |
152 | ||
153 | /* | |
154 | * Time slots for this packet. | |
155 | */ | |
156 | ||
157 | SHAPERCB(skb)->shapelen= shaper_clocks(shaper,skb); | |
158 | ||
1da177e4 LT |
159 | { |
160 | struct sk_buff *tmp; | |
161 | /* | |
162 | * Up our shape clock by the time pending on the queue | |
163 | * (Should keep this in the shaper as a variable..) | |
164 | */ | |
165 | for(tmp=skb_peek(&shaper->sendq); tmp!=NULL && | |
166 | tmp!=(struct sk_buff *)&shaper->sendq; tmp=tmp->next) | |
167 | SHAPERCB(skb)->shapeclock+=SHAPERCB(tmp)->shapelen; | |
168 | /* | |
169 | * Queue over time. Spill packet. | |
170 | */ | |
171 | if(SHAPERCB(skb)->shapeclock-jiffies > SHAPER_LATENCY) { | |
172 | dev_kfree_skb(skb); | |
173 | shaper->stats.tx_dropped++; | |
174 | } else | |
175 | skb_queue_tail(&shaper->sendq, skb); | |
176 | } | |
8728b834 | 177 | |
1da177e4 LT |
178 | if(sh_debug) |
179 | printk("Frame queued.\n"); | |
180 | if(skb_queue_len(&shaper->sendq)>SHAPER_QLEN) | |
181 | { | |
182 | ptr=skb_dequeue(&shaper->sendq); | |
183 | dev_kfree_skb(ptr); | |
184 | shaper->stats.collisions++; | |
185 | } | |
b597ef47 | 186 | shaper_kick(shaper); |
bc971dee | 187 | spin_unlock(&shaper->lock); |
1da177e4 LT |
188 | return 0; |
189 | } | |
190 | ||
191 | /* | |
192 | * Transmit from a shaper | |
193 | */ | |
194 | ||
195 | static void shaper_queue_xmit(struct shaper *shaper, struct sk_buff *skb) | |
196 | { | |
197 | struct sk_buff *newskb=skb_clone(skb, GFP_ATOMIC); | |
198 | if(sh_debug) | |
199 | printk("Kick frame on %p\n",newskb); | |
200 | if(newskb) | |
201 | { | |
202 | newskb->dev=shaper->dev; | |
203 | newskb->priority=2; | |
204 | if(sh_debug) | |
205 | printk("Kick new frame to %s, %d\n", | |
206 | shaper->dev->name,newskb->priority); | |
207 | dev_queue_xmit(newskb); | |
208 | ||
209 | shaper->stats.tx_bytes += skb->len; | |
210 | shaper->stats.tx_packets++; | |
211 | ||
212 | if(sh_debug) | |
213 | printk("Kicked new frame out.\n"); | |
214 | dev_kfree_skb(skb); | |
215 | } | |
216 | } | |
217 | ||
218 | /* | |
219 | * Timer handler for shaping clock | |
220 | */ | |
221 | ||
222 | static void shaper_timer(unsigned long data) | |
223 | { | |
b597ef47 CH |
224 | struct shaper *shaper = (struct shaper *)data; |
225 | ||
bc971dee CH |
226 | spin_lock(&shaper->lock); |
227 | shaper_kick(shaper); | |
228 | spin_unlock(&shaper->lock); | |
1da177e4 LT |
229 | } |
230 | ||
231 | /* | |
232 | * Kick a shaper queue and try and do something sensible with the | |
233 | * queue. | |
234 | */ | |
235 | ||
236 | static void shaper_kick(struct shaper *shaper) | |
237 | { | |
238 | struct sk_buff *skb; | |
239 | ||
1da177e4 LT |
240 | /* |
241 | * Walk the list (may be empty) | |
242 | */ | |
243 | ||
244 | while((skb=skb_peek(&shaper->sendq))!=NULL) | |
245 | { | |
246 | /* | |
247 | * Each packet due to go out by now (within an error | |
248 | * of SHAPER_BURST) gets kicked onto the link | |
249 | */ | |
250 | ||
251 | if(sh_debug) | |
252 | printk("Clock = %ld, jiffies = %ld\n", SHAPERCB(skb)->shapeclock, jiffies); | |
253 | if(time_before_eq(SHAPERCB(skb)->shapeclock, jiffies + SHAPER_BURST)) | |
254 | { | |
255 | /* | |
256 | * Pull the frame and get interrupts back on. | |
257 | */ | |
258 | ||
8728b834 | 259 | skb_unlink(skb, &shaper->sendq); |
1da177e4 LT |
260 | if (shaper->recovery < |
261 | SHAPERCB(skb)->shapeclock + SHAPERCB(skb)->shapelen) | |
262 | shaper->recovery = SHAPERCB(skb)->shapeclock + SHAPERCB(skb)->shapelen; | |
263 | /* | |
264 | * Pass on to the physical target device via | |
265 | * our low level packet thrower. | |
266 | */ | |
267 | ||
268 | SHAPERCB(skb)->shapepend=0; | |
269 | shaper_queue_xmit(shaper, skb); /* Fire */ | |
270 | } | |
271 | else | |
272 | break; | |
273 | } | |
274 | ||
275 | /* | |
276 | * Next kick. | |
277 | */ | |
278 | ||
279 | if(skb!=NULL) | |
280 | mod_timer(&shaper->timer, SHAPERCB(skb)->shapeclock); | |
1da177e4 LT |
281 | } |
282 | ||
283 | ||
1da177e4 LT |
284 | /* |
285 | * Bring the interface up. We just disallow this until a | |
286 | * bind. | |
287 | */ | |
288 | ||
289 | static int shaper_open(struct net_device *dev) | |
290 | { | |
291 | struct shaper *shaper=dev->priv; | |
292 | ||
293 | /* | |
294 | * Can't open until attached. | |
295 | * Also can't open until speed is set, or we'll get | |
296 | * a division by zero. | |
297 | */ | |
298 | ||
299 | if(shaper->dev==NULL) | |
300 | return -ENODEV; | |
301 | if(shaper->bitspersec==0) | |
302 | return -EINVAL; | |
303 | return 0; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Closing a shaper flushes the queues. | |
308 | */ | |
309 | ||
310 | static int shaper_close(struct net_device *dev) | |
311 | { | |
312 | struct shaper *shaper=dev->priv; | |
bc971dee CH |
313 | struct sk_buff *skb; |
314 | ||
315 | while ((skb = skb_dequeue(&shaper->sendq)) != NULL) | |
316 | dev_kfree_skb(skb); | |
317 | ||
318 | spin_lock_bh(&shaper->lock); | |
319 | shaper_kick(shaper); | |
320 | spin_unlock_bh(&shaper->lock); | |
321 | ||
1da177e4 LT |
322 | del_timer_sync(&shaper->timer); |
323 | return 0; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Revectored calls. We alter the parameters and call the functions | |
328 | * for our attached device. This enables us to bandwidth allocate after | |
329 | * ARP and other resolutions and not before. | |
330 | */ | |
331 | ||
1da177e4 LT |
332 | static struct net_device_stats *shaper_get_stats(struct net_device *dev) |
333 | { | |
334 | struct shaper *sh=dev->priv; | |
335 | return &sh->stats; | |
336 | } | |
337 | ||
338 | static int shaper_header(struct sk_buff *skb, struct net_device *dev, | |
339 | unsigned short type, void *daddr, void *saddr, unsigned len) | |
340 | { | |
341 | struct shaper *sh=dev->priv; | |
342 | int v; | |
343 | if(sh_debug) | |
344 | printk("Shaper header\n"); | |
345 | skb->dev=sh->dev; | |
346 | v=sh->hard_header(skb,sh->dev,type,daddr,saddr,len); | |
347 | skb->dev=dev; | |
348 | return v; | |
349 | } | |
350 | ||
351 | static int shaper_rebuild_header(struct sk_buff *skb) | |
352 | { | |
353 | struct shaper *sh=skb->dev->priv; | |
354 | struct net_device *dev=skb->dev; | |
355 | int v; | |
356 | if(sh_debug) | |
357 | printk("Shaper rebuild header\n"); | |
358 | skb->dev=sh->dev; | |
359 | v=sh->rebuild_header(skb); | |
360 | skb->dev=dev; | |
361 | return v; | |
362 | } | |
363 | ||
364 | #if 0 | |
365 | static int shaper_cache(struct neighbour *neigh, struct hh_cache *hh) | |
366 | { | |
367 | struct shaper *sh=neigh->dev->priv; | |
368 | struct net_device *tmp; | |
369 | int ret; | |
370 | if(sh_debug) | |
371 | printk("Shaper header cache bind\n"); | |
372 | tmp=neigh->dev; | |
373 | neigh->dev=sh->dev; | |
374 | ret=sh->hard_header_cache(neigh,hh); | |
375 | neigh->dev=tmp; | |
376 | return ret; | |
377 | } | |
378 | ||
379 | static void shaper_cache_update(struct hh_cache *hh, struct net_device *dev, | |
380 | unsigned char *haddr) | |
381 | { | |
382 | struct shaper *sh=dev->priv; | |
383 | if(sh_debug) | |
384 | printk("Shaper cache update\n"); | |
385 | sh->header_cache_update(hh, sh->dev, haddr); | |
386 | } | |
387 | #endif | |
388 | ||
389 | #ifdef CONFIG_INET | |
390 | ||
391 | static int shaper_neigh_setup(struct neighbour *n) | |
392 | { | |
393 | #ifdef CONFIG_INET | |
394 | if (n->nud_state == NUD_NONE) { | |
395 | n->ops = &arp_broken_ops; | |
396 | n->output = n->ops->output; | |
397 | } | |
398 | #endif | |
399 | return 0; | |
400 | } | |
401 | ||
402 | static int shaper_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) | |
403 | { | |
404 | #ifdef CONFIG_INET | |
405 | if (p->tbl->family == AF_INET) { | |
406 | p->neigh_setup = shaper_neigh_setup; | |
407 | p->ucast_probes = 0; | |
408 | p->mcast_probes = 0; | |
409 | } | |
410 | #endif | |
411 | return 0; | |
412 | } | |
413 | ||
414 | #else /* !(CONFIG_INET) */ | |
415 | ||
416 | static int shaper_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p) | |
417 | { | |
418 | return 0; | |
419 | } | |
420 | ||
421 | #endif | |
422 | ||
423 | static int shaper_attach(struct net_device *shdev, struct shaper *sh, struct net_device *dev) | |
424 | { | |
425 | sh->dev = dev; | |
426 | sh->hard_start_xmit=dev->hard_start_xmit; | |
427 | sh->get_stats=dev->get_stats; | |
428 | if(dev->hard_header) | |
429 | { | |
430 | sh->hard_header=dev->hard_header; | |
431 | shdev->hard_header = shaper_header; | |
432 | } | |
433 | else | |
434 | shdev->hard_header = NULL; | |
435 | ||
436 | if(dev->rebuild_header) | |
437 | { | |
438 | sh->rebuild_header = dev->rebuild_header; | |
439 | shdev->rebuild_header = shaper_rebuild_header; | |
440 | } | |
441 | else | |
442 | shdev->rebuild_header = NULL; | |
443 | ||
444 | #if 0 | |
445 | if(dev->hard_header_cache) | |
446 | { | |
447 | sh->hard_header_cache = dev->hard_header_cache; | |
448 | shdev->hard_header_cache= shaper_cache; | |
449 | } | |
450 | else | |
451 | { | |
452 | shdev->hard_header_cache= NULL; | |
453 | } | |
454 | ||
455 | if(dev->header_cache_update) | |
456 | { | |
457 | sh->header_cache_update = dev->header_cache_update; | |
458 | shdev->header_cache_update = shaper_cache_update; | |
459 | } | |
460 | else | |
461 | shdev->header_cache_update= NULL; | |
462 | #else | |
463 | shdev->header_cache_update = NULL; | |
464 | shdev->hard_header_cache = NULL; | |
465 | #endif | |
466 | shdev->neigh_setup = shaper_neigh_setup_dev; | |
467 | ||
468 | shdev->hard_header_len=dev->hard_header_len; | |
469 | shdev->type=dev->type; | |
470 | shdev->addr_len=dev->addr_len; | |
471 | shdev->mtu=dev->mtu; | |
472 | sh->bitspersec=0; | |
473 | return 0; | |
474 | } | |
475 | ||
476 | static int shaper_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) | |
477 | { | |
478 | struct shaperconf *ss= (struct shaperconf *)&ifr->ifr_ifru; | |
479 | struct shaper *sh=dev->priv; | |
480 | ||
481 | if(ss->ss_cmd == SHAPER_SET_DEV || ss->ss_cmd == SHAPER_SET_SPEED) | |
482 | { | |
483 | if(!capable(CAP_NET_ADMIN)) | |
484 | return -EPERM; | |
485 | } | |
486 | ||
487 | switch(ss->ss_cmd) | |
488 | { | |
489 | case SHAPER_SET_DEV: | |
490 | { | |
491 | struct net_device *them=__dev_get_by_name(ss->ss_name); | |
492 | if(them==NULL) | |
493 | return -ENODEV; | |
494 | if(sh->dev) | |
495 | return -EBUSY; | |
496 | return shaper_attach(dev,dev->priv, them); | |
497 | } | |
498 | case SHAPER_GET_DEV: | |
499 | if(sh->dev==NULL) | |
500 | return -ENODEV; | |
501 | strcpy(ss->ss_name, sh->dev->name); | |
502 | return 0; | |
503 | case SHAPER_SET_SPEED: | |
504 | shaper_setspeed(sh,ss->ss_speed); | |
505 | return 0; | |
506 | case SHAPER_GET_SPEED: | |
507 | ss->ss_speed=sh->bitspersec; | |
508 | return 0; | |
509 | default: | |
510 | return -EINVAL; | |
511 | } | |
512 | } | |
513 | ||
514 | static void shaper_init_priv(struct net_device *dev) | |
515 | { | |
516 | struct shaper *sh = dev->priv; | |
517 | ||
518 | skb_queue_head_init(&sh->sendq); | |
519 | init_timer(&sh->timer); | |
520 | sh->timer.function=shaper_timer; | |
521 | sh->timer.data=(unsigned long)sh; | |
bc971dee | 522 | spin_lock_init(&sh->lock); |
1da177e4 LT |
523 | } |
524 | ||
525 | /* | |
526 | * Add a shaper device to the system | |
527 | */ | |
528 | ||
529 | static void __init shaper_setup(struct net_device *dev) | |
530 | { | |
531 | /* | |
532 | * Set up the shaper. | |
533 | */ | |
534 | ||
535 | SET_MODULE_OWNER(dev); | |
536 | ||
537 | shaper_init_priv(dev); | |
538 | ||
539 | dev->open = shaper_open; | |
540 | dev->stop = shaper_close; | |
541 | dev->hard_start_xmit = shaper_start_xmit; | |
542 | dev->get_stats = shaper_get_stats; | |
543 | dev->set_multicast_list = NULL; | |
544 | ||
545 | /* | |
546 | * Intialise the packet queues | |
547 | */ | |
548 | ||
549 | /* | |
550 | * Handlers for when we attach to a device. | |
551 | */ | |
552 | ||
553 | dev->hard_header = shaper_header; | |
554 | dev->rebuild_header = shaper_rebuild_header; | |
555 | #if 0 | |
556 | dev->hard_header_cache = shaper_cache; | |
557 | dev->header_cache_update= shaper_cache_update; | |
558 | #endif | |
559 | dev->neigh_setup = shaper_neigh_setup_dev; | |
560 | dev->do_ioctl = shaper_ioctl; | |
561 | dev->hard_header_len = 0; | |
562 | dev->type = ARPHRD_ETHER; /* initially */ | |
563 | dev->set_mac_address = NULL; | |
564 | dev->mtu = 1500; | |
565 | dev->addr_len = 0; | |
566 | dev->tx_queue_len = 10; | |
567 | dev->flags = 0; | |
568 | } | |
569 | ||
570 | static int shapers = 1; | |
571 | #ifdef MODULE | |
572 | ||
573 | module_param(shapers, int, 0); | |
574 | MODULE_PARM_DESC(shapers, "Traffic shaper: maximum number of shapers"); | |
575 | ||
576 | #else /* MODULE */ | |
577 | ||
578 | static int __init set_num_shapers(char *str) | |
579 | { | |
580 | shapers = simple_strtol(str, NULL, 0); | |
581 | return 1; | |
582 | } | |
583 | ||
584 | __setup("shapers=", set_num_shapers); | |
585 | ||
586 | #endif /* MODULE */ | |
587 | ||
588 | static struct net_device **devs; | |
589 | ||
590 | static unsigned int shapers_registered = 0; | |
591 | ||
592 | static int __init shaper_init(void) | |
593 | { | |
594 | int i; | |
595 | size_t alloc_size; | |
596 | struct net_device *dev; | |
597 | char name[IFNAMSIZ]; | |
598 | ||
599 | if (shapers < 1) | |
600 | return -ENODEV; | |
601 | ||
602 | alloc_size = sizeof(*dev) * shapers; | |
603 | devs = kmalloc(alloc_size, GFP_KERNEL); | |
604 | if (!devs) | |
605 | return -ENOMEM; | |
606 | memset(devs, 0, alloc_size); | |
607 | ||
608 | for (i = 0; i < shapers; i++) { | |
609 | ||
610 | snprintf(name, IFNAMSIZ, "shaper%d", i); | |
611 | dev = alloc_netdev(sizeof(struct shaper), name, | |
612 | shaper_setup); | |
613 | if (!dev) | |
614 | break; | |
615 | ||
616 | if (register_netdev(dev)) { | |
617 | free_netdev(dev); | |
618 | break; | |
619 | } | |
620 | ||
621 | devs[i] = dev; | |
622 | shapers_registered++; | |
623 | } | |
624 | ||
625 | if (!shapers_registered) { | |
626 | kfree(devs); | |
627 | devs = NULL; | |
628 | } | |
629 | ||
630 | return (shapers_registered ? 0 : -ENODEV); | |
631 | } | |
632 | ||
633 | static void __exit shaper_exit (void) | |
634 | { | |
635 | int i; | |
636 | ||
637 | for (i = 0; i < shapers_registered; i++) { | |
638 | if (devs[i]) { | |
639 | unregister_netdev(devs[i]); | |
640 | free_netdev(devs[i]); | |
641 | } | |
642 | } | |
643 | ||
644 | kfree(devs); | |
645 | devs = NULL; | |
646 | } | |
647 | ||
648 | module_init(shaper_init); | |
649 | module_exit(shaper_exit); | |
650 | MODULE_LICENSE("GPL"); | |
651 |