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1da177e4 LT |
1 | /* |
2 | * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier. | |
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 | * The filters are packed to hash tables of key nodes | |
12 | * with a set of 32bit key/mask pairs at every node. | |
13 | * Nodes reference next level hash tables etc. | |
14 | * | |
15 | * This scheme is the best universal classifier I managed to | |
16 | * invent; it is not super-fast, but it is not slow (provided you | |
17 | * program it correctly), and general enough. And its relative | |
18 | * speed grows as the number of rules becomes larger. | |
19 | * | |
20 | * It seems that it represents the best middle point between | |
21 | * speed and manageability both by human and by machine. | |
22 | * | |
23 | * It is especially useful for link sharing combined with QoS; | |
24 | * pure RSVP doesn't need such a general approach and can use | |
25 | * much simpler (and faster) schemes, sort of cls_rsvp.c. | |
26 | * | |
27 | * JHS: We should remove the CONFIG_NET_CLS_IND from here | |
28 | * eventually when the meta match extension is made available | |
29 | * | |
30 | * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro> | |
31 | */ | |
32 | ||
33 | #include <asm/uaccess.h> | |
34 | #include <asm/system.h> | |
35 | #include <linux/bitops.h> | |
36 | #include <linux/config.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/types.h> | |
39 | #include <linux/kernel.h> | |
40 | #include <linux/sched.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/mm.h> | |
43 | #include <linux/socket.h> | |
44 | #include <linux/sockios.h> | |
45 | #include <linux/in.h> | |
46 | #include <linux/errno.h> | |
47 | #include <linux/interrupt.h> | |
48 | #include <linux/if_ether.h> | |
49 | #include <linux/inet.h> | |
50 | #include <linux/netdevice.h> | |
51 | #include <linux/etherdevice.h> | |
52 | #include <linux/notifier.h> | |
53 | #include <linux/rtnetlink.h> | |
54 | #include <net/ip.h> | |
55 | #include <net/route.h> | |
56 | #include <linux/skbuff.h> | |
57 | #include <net/sock.h> | |
58 | #include <net/act_api.h> | |
59 | #include <net/pkt_cls.h> | |
60 | ||
61 | struct tc_u_knode | |
62 | { | |
63 | struct tc_u_knode *next; | |
64 | u32 handle; | |
65 | struct tc_u_hnode *ht_up; | |
66 | struct tcf_exts exts; | |
67 | #ifdef CONFIG_NET_CLS_IND | |
68 | char indev[IFNAMSIZ]; | |
69 | #endif | |
70 | u8 fshift; | |
71 | struct tcf_result res; | |
72 | struct tc_u_hnode *ht_down; | |
73 | #ifdef CONFIG_CLS_U32_PERF | |
74 | struct tc_u32_pcnt *pf; | |
75 | #endif | |
76 | #ifdef CONFIG_CLS_U32_MARK | |
77 | struct tc_u32_mark mark; | |
78 | #endif | |
79 | struct tc_u32_sel sel; | |
80 | }; | |
81 | ||
82 | struct tc_u_hnode | |
83 | { | |
84 | struct tc_u_hnode *next; | |
85 | u32 handle; | |
86 | u32 prio; | |
87 | struct tc_u_common *tp_c; | |
88 | int refcnt; | |
89 | unsigned divisor; | |
90 | struct tc_u_knode *ht[1]; | |
91 | }; | |
92 | ||
93 | struct tc_u_common | |
94 | { | |
95 | struct tc_u_common *next; | |
96 | struct tc_u_hnode *hlist; | |
97 | struct Qdisc *q; | |
98 | int refcnt; | |
99 | u32 hgenerator; | |
100 | }; | |
101 | ||
102 | static struct tcf_ext_map u32_ext_map = { | |
103 | .action = TCA_U32_ACT, | |
104 | .police = TCA_U32_POLICE | |
105 | }; | |
106 | ||
107 | static struct tc_u_common *u32_list; | |
108 | ||
109 | static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift) | |
110 | { | |
111 | unsigned h = (key & sel->hmask)>>fshift; | |
112 | ||
113 | return h; | |
114 | } | |
115 | ||
116 | static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res) | |
117 | { | |
118 | struct { | |
119 | struct tc_u_knode *knode; | |
120 | u8 *ptr; | |
121 | } stack[TC_U32_MAXDEPTH]; | |
122 | ||
123 | struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root; | |
124 | u8 *ptr = skb->nh.raw; | |
125 | struct tc_u_knode *n; | |
126 | int sdepth = 0; | |
127 | int off2 = 0; | |
128 | int sel = 0; | |
129 | #ifdef CONFIG_CLS_U32_PERF | |
130 | int j; | |
131 | #endif | |
132 | int i, r; | |
133 | ||
134 | next_ht: | |
135 | n = ht->ht[sel]; | |
136 | ||
137 | next_knode: | |
138 | if (n) { | |
139 | struct tc_u32_key *key = n->sel.keys; | |
140 | ||
141 | #ifdef CONFIG_CLS_U32_PERF | |
142 | n->pf->rcnt +=1; | |
143 | j = 0; | |
144 | #endif | |
145 | ||
146 | #ifdef CONFIG_CLS_U32_MARK | |
147 | if ((skb->nfmark & n->mark.mask) != n->mark.val) { | |
148 | n = n->next; | |
149 | goto next_knode; | |
150 | } else { | |
151 | n->mark.success++; | |
152 | } | |
153 | #endif | |
154 | ||
155 | for (i = n->sel.nkeys; i>0; i--, key++) { | |
156 | ||
157 | if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) { | |
158 | n = n->next; | |
159 | goto next_knode; | |
160 | } | |
161 | #ifdef CONFIG_CLS_U32_PERF | |
162 | n->pf->kcnts[j] +=1; | |
163 | j++; | |
164 | #endif | |
165 | } | |
166 | if (n->ht_down == NULL) { | |
167 | check_terminal: | |
168 | if (n->sel.flags&TC_U32_TERMINAL) { | |
169 | ||
170 | *res = n->res; | |
171 | #ifdef CONFIG_NET_CLS_IND | |
172 | if (!tcf_match_indev(skb, n->indev)) { | |
173 | n = n->next; | |
174 | goto next_knode; | |
175 | } | |
176 | #endif | |
177 | #ifdef CONFIG_CLS_U32_PERF | |
178 | n->pf->rhit +=1; | |
179 | #endif | |
180 | r = tcf_exts_exec(skb, &n->exts, res); | |
181 | if (r < 0) { | |
182 | n = n->next; | |
183 | goto next_knode; | |
184 | } | |
185 | ||
186 | return r; | |
187 | } | |
188 | n = n->next; | |
189 | goto next_knode; | |
190 | } | |
191 | ||
192 | /* PUSH */ | |
193 | if (sdepth >= TC_U32_MAXDEPTH) | |
194 | goto deadloop; | |
195 | stack[sdepth].knode = n; | |
196 | stack[sdepth].ptr = ptr; | |
197 | sdepth++; | |
198 | ||
199 | ht = n->ht_down; | |
200 | sel = 0; | |
201 | if (ht->divisor) | |
202 | sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift); | |
203 | ||
204 | if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT))) | |
205 | goto next_ht; | |
206 | ||
207 | if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) { | |
208 | off2 = n->sel.off + 3; | |
209 | if (n->sel.flags&TC_U32_VAROFFSET) | |
210 | off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift; | |
211 | off2 &= ~3; | |
212 | } | |
213 | if (n->sel.flags&TC_U32_EAT) { | |
214 | ptr += off2; | |
215 | off2 = 0; | |
216 | } | |
217 | ||
218 | if (ptr < skb->tail) | |
219 | goto next_ht; | |
220 | } | |
221 | ||
222 | /* POP */ | |
223 | if (sdepth--) { | |
224 | n = stack[sdepth].knode; | |
225 | ht = n->ht_up; | |
226 | ptr = stack[sdepth].ptr; | |
227 | goto check_terminal; | |
228 | } | |
229 | return -1; | |
230 | ||
231 | deadloop: | |
232 | if (net_ratelimit()) | |
233 | printk("cls_u32: dead loop\n"); | |
234 | return -1; | |
235 | } | |
236 | ||
237 | static __inline__ struct tc_u_hnode * | |
238 | u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) | |
239 | { | |
240 | struct tc_u_hnode *ht; | |
241 | ||
242 | for (ht = tp_c->hlist; ht; ht = ht->next) | |
243 | if (ht->handle == handle) | |
244 | break; | |
245 | ||
246 | return ht; | |
247 | } | |
248 | ||
249 | static __inline__ struct tc_u_knode * | |
250 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) | |
251 | { | |
252 | unsigned sel; | |
253 | struct tc_u_knode *n = NULL; | |
254 | ||
255 | sel = TC_U32_HASH(handle); | |
256 | if (sel > ht->divisor) | |
257 | goto out; | |
258 | ||
259 | for (n = ht->ht[sel]; n; n = n->next) | |
260 | if (n->handle == handle) | |
261 | break; | |
262 | out: | |
263 | return n; | |
264 | } | |
265 | ||
266 | ||
267 | static unsigned long u32_get(struct tcf_proto *tp, u32 handle) | |
268 | { | |
269 | struct tc_u_hnode *ht; | |
270 | struct tc_u_common *tp_c = tp->data; | |
271 | ||
272 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
273 | ht = tp->root; | |
274 | else | |
275 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
276 | ||
277 | if (!ht) | |
278 | return 0; | |
279 | ||
280 | if (TC_U32_KEY(handle) == 0) | |
281 | return (unsigned long)ht; | |
282 | ||
283 | return (unsigned long)u32_lookup_key(ht, handle); | |
284 | } | |
285 | ||
286 | static void u32_put(struct tcf_proto *tp, unsigned long f) | |
287 | { | |
288 | } | |
289 | ||
290 | static u32 gen_new_htid(struct tc_u_common *tp_c) | |
291 | { | |
292 | int i = 0x800; | |
293 | ||
294 | do { | |
295 | if (++tp_c->hgenerator == 0x7FF) | |
296 | tp_c->hgenerator = 1; | |
297 | } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); | |
298 | ||
299 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
300 | } | |
301 | ||
302 | static int u32_init(struct tcf_proto *tp) | |
303 | { | |
304 | struct tc_u_hnode *root_ht; | |
305 | struct tc_u_common *tp_c; | |
306 | ||
307 | for (tp_c = u32_list; tp_c; tp_c = tp_c->next) | |
308 | if (tp_c->q == tp->q) | |
309 | break; | |
310 | ||
311 | root_ht = kmalloc(sizeof(*root_ht), GFP_KERNEL); | |
312 | if (root_ht == NULL) | |
313 | return -ENOBUFS; | |
314 | ||
315 | memset(root_ht, 0, sizeof(*root_ht)); | |
316 | root_ht->divisor = 0; | |
317 | root_ht->refcnt++; | |
318 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
319 | root_ht->prio = tp->prio; | |
320 | ||
321 | if (tp_c == NULL) { | |
322 | tp_c = kmalloc(sizeof(*tp_c), GFP_KERNEL); | |
323 | if (tp_c == NULL) { | |
324 | kfree(root_ht); | |
325 | return -ENOBUFS; | |
326 | } | |
327 | memset(tp_c, 0, sizeof(*tp_c)); | |
328 | tp_c->q = tp->q; | |
329 | tp_c->next = u32_list; | |
330 | u32_list = tp_c; | |
331 | } | |
332 | ||
333 | tp_c->refcnt++; | |
334 | root_ht->next = tp_c->hlist; | |
335 | tp_c->hlist = root_ht; | |
336 | root_ht->tp_c = tp_c; | |
337 | ||
338 | tp->root = root_ht; | |
339 | tp->data = tp_c; | |
340 | return 0; | |
341 | } | |
342 | ||
343 | static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n) | |
344 | { | |
345 | tcf_unbind_filter(tp, &n->res); | |
346 | tcf_exts_destroy(tp, &n->exts); | |
347 | if (n->ht_down) | |
348 | n->ht_down->refcnt--; | |
349 | #ifdef CONFIG_CLS_U32_PERF | |
a51482bd | 350 | if (n) |
1da177e4 LT |
351 | kfree(n->pf); |
352 | #endif | |
353 | kfree(n); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key) | |
358 | { | |
359 | struct tc_u_knode **kp; | |
360 | struct tc_u_hnode *ht = key->ht_up; | |
361 | ||
362 | if (ht) { | |
363 | for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) { | |
364 | if (*kp == key) { | |
365 | tcf_tree_lock(tp); | |
366 | *kp = key->next; | |
367 | tcf_tree_unlock(tp); | |
368 | ||
369 | u32_destroy_key(tp, key); | |
370 | return 0; | |
371 | } | |
372 | } | |
373 | } | |
374 | BUG_TRAP(0); | |
375 | return 0; | |
376 | } | |
377 | ||
378 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
379 | { | |
380 | struct tc_u_knode *n; | |
381 | unsigned h; | |
382 | ||
383 | for (h=0; h<=ht->divisor; h++) { | |
384 | while ((n = ht->ht[h]) != NULL) { | |
385 | ht->ht[h] = n->next; | |
386 | ||
387 | u32_destroy_key(tp, n); | |
388 | } | |
389 | } | |
390 | } | |
391 | ||
392 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
393 | { | |
394 | struct tc_u_common *tp_c = tp->data; | |
395 | struct tc_u_hnode **hn; | |
396 | ||
397 | BUG_TRAP(!ht->refcnt); | |
398 | ||
399 | u32_clear_hnode(tp, ht); | |
400 | ||
401 | for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) { | |
402 | if (*hn == ht) { | |
403 | *hn = ht->next; | |
404 | kfree(ht); | |
405 | return 0; | |
406 | } | |
407 | } | |
408 | ||
409 | BUG_TRAP(0); | |
410 | return -ENOENT; | |
411 | } | |
412 | ||
413 | static void u32_destroy(struct tcf_proto *tp) | |
414 | { | |
415 | struct tc_u_common *tp_c = tp->data; | |
416 | struct tc_u_hnode *root_ht = xchg(&tp->root, NULL); | |
417 | ||
418 | BUG_TRAP(root_ht != NULL); | |
419 | ||
420 | if (root_ht && --root_ht->refcnt == 0) | |
421 | u32_destroy_hnode(tp, root_ht); | |
422 | ||
423 | if (--tp_c->refcnt == 0) { | |
424 | struct tc_u_hnode *ht; | |
425 | struct tc_u_common **tp_cp; | |
426 | ||
427 | for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) { | |
428 | if (*tp_cp == tp_c) { | |
429 | *tp_cp = tp_c->next; | |
430 | break; | |
431 | } | |
432 | } | |
433 | ||
434 | for (ht=tp_c->hlist; ht; ht = ht->next) | |
435 | u32_clear_hnode(tp, ht); | |
436 | ||
437 | while ((ht = tp_c->hlist) != NULL) { | |
438 | tp_c->hlist = ht->next; | |
439 | ||
440 | BUG_TRAP(ht->refcnt == 0); | |
441 | ||
442 | kfree(ht); | |
443 | }; | |
444 | ||
445 | kfree(tp_c); | |
446 | } | |
447 | ||
448 | tp->data = NULL; | |
449 | } | |
450 | ||
451 | static int u32_delete(struct tcf_proto *tp, unsigned long arg) | |
452 | { | |
453 | struct tc_u_hnode *ht = (struct tc_u_hnode*)arg; | |
454 | ||
455 | if (ht == NULL) | |
456 | return 0; | |
457 | ||
458 | if (TC_U32_KEY(ht->handle)) | |
459 | return u32_delete_key(tp, (struct tc_u_knode*)ht); | |
460 | ||
461 | if (tp->root == ht) | |
462 | return -EINVAL; | |
463 | ||
464 | if (--ht->refcnt == 0) | |
465 | u32_destroy_hnode(tp, ht); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) | |
471 | { | |
472 | struct tc_u_knode *n; | |
473 | unsigned i = 0x7FF; | |
474 | ||
475 | for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next) | |
476 | if (i < TC_U32_NODE(n->handle)) | |
477 | i = TC_U32_NODE(n->handle); | |
478 | i++; | |
479 | ||
480 | return handle|(i>0xFFF ? 0xFFF : i); | |
481 | } | |
482 | ||
483 | static int u32_set_parms(struct tcf_proto *tp, unsigned long base, | |
484 | struct tc_u_hnode *ht, | |
485 | struct tc_u_knode *n, struct rtattr **tb, | |
486 | struct rtattr *est) | |
487 | { | |
488 | int err; | |
489 | struct tcf_exts e; | |
490 | ||
491 | err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map); | |
492 | if (err < 0) | |
493 | return err; | |
494 | ||
495 | err = -EINVAL; | |
496 | if (tb[TCA_U32_LINK-1]) { | |
497 | u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]); | |
498 | struct tc_u_hnode *ht_down = NULL; | |
499 | ||
500 | if (TC_U32_KEY(handle)) | |
501 | goto errout; | |
502 | ||
503 | if (handle) { | |
504 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
505 | ||
506 | if (ht_down == NULL) | |
507 | goto errout; | |
508 | ht_down->refcnt++; | |
509 | } | |
510 | ||
511 | tcf_tree_lock(tp); | |
512 | ht_down = xchg(&n->ht_down, ht_down); | |
513 | tcf_tree_unlock(tp); | |
514 | ||
515 | if (ht_down) | |
516 | ht_down->refcnt--; | |
517 | } | |
518 | if (tb[TCA_U32_CLASSID-1]) { | |
519 | n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]); | |
520 | tcf_bind_filter(tp, &n->res, base); | |
521 | } | |
522 | ||
523 | #ifdef CONFIG_NET_CLS_IND | |
524 | if (tb[TCA_U32_INDEV-1]) { | |
525 | int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]); | |
526 | if (err < 0) | |
527 | goto errout; | |
528 | } | |
529 | #endif | |
530 | tcf_exts_change(tp, &n->exts, &e); | |
531 | ||
532 | return 0; | |
533 | errout: | |
534 | tcf_exts_destroy(tp, &e); | |
535 | return err; | |
536 | } | |
537 | ||
538 | static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle, | |
539 | struct rtattr **tca, | |
540 | unsigned long *arg) | |
541 | { | |
542 | struct tc_u_common *tp_c = tp->data; | |
543 | struct tc_u_hnode *ht; | |
544 | struct tc_u_knode *n; | |
545 | struct tc_u32_sel *s; | |
546 | struct rtattr *opt = tca[TCA_OPTIONS-1]; | |
547 | struct rtattr *tb[TCA_U32_MAX]; | |
548 | u32 htid; | |
549 | int err; | |
550 | ||
551 | if (opt == NULL) | |
552 | return handle ? -EINVAL : 0; | |
553 | ||
554 | if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0) | |
555 | return -EINVAL; | |
556 | ||
557 | if ((n = (struct tc_u_knode*)*arg) != NULL) { | |
558 | if (TC_U32_KEY(n->handle) == 0) | |
559 | return -EINVAL; | |
560 | ||
561 | return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]); | |
562 | } | |
563 | ||
564 | if (tb[TCA_U32_DIVISOR-1]) { | |
565 | unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]); | |
566 | ||
567 | if (--divisor > 0x100) | |
568 | return -EINVAL; | |
569 | if (TC_U32_KEY(handle)) | |
570 | return -EINVAL; | |
571 | if (handle == 0) { | |
572 | handle = gen_new_htid(tp->data); | |
573 | if (handle == 0) | |
574 | return -ENOMEM; | |
575 | } | |
576 | ht = kmalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL); | |
577 | if (ht == NULL) | |
578 | return -ENOBUFS; | |
579 | memset(ht, 0, sizeof(*ht) + divisor*sizeof(void*)); | |
580 | ht->tp_c = tp_c; | |
581 | ht->refcnt = 0; | |
582 | ht->divisor = divisor; | |
583 | ht->handle = handle; | |
584 | ht->prio = tp->prio; | |
585 | ht->next = tp_c->hlist; | |
586 | tp_c->hlist = ht; | |
587 | *arg = (unsigned long)ht; | |
588 | return 0; | |
589 | } | |
590 | ||
591 | if (tb[TCA_U32_HASH-1]) { | |
592 | htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]); | |
593 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { | |
594 | ht = tp->root; | |
595 | htid = ht->handle; | |
596 | } else { | |
597 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
598 | if (ht == NULL) | |
599 | return -EINVAL; | |
600 | } | |
601 | } else { | |
602 | ht = tp->root; | |
603 | htid = ht->handle; | |
604 | } | |
605 | ||
606 | if (ht->divisor < TC_U32_HASH(htid)) | |
607 | return -EINVAL; | |
608 | ||
609 | if (handle) { | |
610 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
611 | return -EINVAL; | |
612 | handle = htid | TC_U32_NODE(handle); | |
613 | } else | |
614 | handle = gen_new_kid(ht, htid); | |
615 | ||
616 | if (tb[TCA_U32_SEL-1] == 0 || | |
617 | RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel)) | |
618 | return -EINVAL; | |
619 | ||
620 | s = RTA_DATA(tb[TCA_U32_SEL-1]); | |
621 | ||
622 | n = kmalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); | |
623 | if (n == NULL) | |
624 | return -ENOBUFS; | |
625 | ||
626 | memset(n, 0, sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key)); | |
627 | #ifdef CONFIG_CLS_U32_PERF | |
628 | n->pf = kmalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL); | |
629 | if (n->pf == NULL) { | |
630 | kfree(n); | |
631 | return -ENOBUFS; | |
632 | } | |
633 | memset(n->pf, 0, sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64)); | |
634 | #endif | |
635 | ||
636 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
637 | n->ht_up = ht; | |
638 | n->handle = handle; | |
639 | { | |
640 | u8 i = 0; | |
641 | u32 mask = s->hmask; | |
642 | if (mask) { | |
643 | while (!(mask & 1)) { | |
644 | i++; | |
645 | mask>>=1; | |
646 | } | |
647 | } | |
648 | n->fshift = i; | |
649 | } | |
650 | ||
651 | #ifdef CONFIG_CLS_U32_MARK | |
652 | if (tb[TCA_U32_MARK-1]) { | |
653 | struct tc_u32_mark *mark; | |
654 | ||
655 | if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) { | |
656 | #ifdef CONFIG_CLS_U32_PERF | |
657 | kfree(n->pf); | |
658 | #endif | |
659 | kfree(n); | |
660 | return -EINVAL; | |
661 | } | |
662 | mark = RTA_DATA(tb[TCA_U32_MARK-1]); | |
663 | memcpy(&n->mark, mark, sizeof(struct tc_u32_mark)); | |
664 | n->mark.success = 0; | |
665 | } | |
666 | #endif | |
667 | ||
668 | err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]); | |
669 | if (err == 0) { | |
670 | struct tc_u_knode **ins; | |
671 | for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next) | |
672 | if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle)) | |
673 | break; | |
674 | ||
675 | n->next = *ins; | |
676 | wmb(); | |
677 | *ins = n; | |
678 | ||
679 | *arg = (unsigned long)n; | |
680 | return 0; | |
681 | } | |
682 | #ifdef CONFIG_CLS_U32_PERF | |
a51482bd | 683 | if (n) |
1da177e4 LT |
684 | kfree(n->pf); |
685 | #endif | |
686 | kfree(n); | |
687 | return err; | |
688 | } | |
689 | ||
690 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
691 | { | |
692 | struct tc_u_common *tp_c = tp->data; | |
693 | struct tc_u_hnode *ht; | |
694 | struct tc_u_knode *n; | |
695 | unsigned h; | |
696 | ||
697 | if (arg->stop) | |
698 | return; | |
699 | ||
700 | for (ht = tp_c->hlist; ht; ht = ht->next) { | |
701 | if (ht->prio != tp->prio) | |
702 | continue; | |
703 | if (arg->count >= arg->skip) { | |
704 | if (arg->fn(tp, (unsigned long)ht, arg) < 0) { | |
705 | arg->stop = 1; | |
706 | return; | |
707 | } | |
708 | } | |
709 | arg->count++; | |
710 | for (h = 0; h <= ht->divisor; h++) { | |
711 | for (n = ht->ht[h]; n; n = n->next) { | |
712 | if (arg->count < arg->skip) { | |
713 | arg->count++; | |
714 | continue; | |
715 | } | |
716 | if (arg->fn(tp, (unsigned long)n, arg) < 0) { | |
717 | arg->stop = 1; | |
718 | return; | |
719 | } | |
720 | arg->count++; | |
721 | } | |
722 | } | |
723 | } | |
724 | } | |
725 | ||
726 | static int u32_dump(struct tcf_proto *tp, unsigned long fh, | |
727 | struct sk_buff *skb, struct tcmsg *t) | |
728 | { | |
729 | struct tc_u_knode *n = (struct tc_u_knode*)fh; | |
730 | unsigned char *b = skb->tail; | |
731 | struct rtattr *rta; | |
732 | ||
733 | if (n == NULL) | |
734 | return skb->len; | |
735 | ||
736 | t->tcm_handle = n->handle; | |
737 | ||
738 | rta = (struct rtattr*)b; | |
739 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
740 | ||
741 | if (TC_U32_KEY(n->handle) == 0) { | |
742 | struct tc_u_hnode *ht = (struct tc_u_hnode*)fh; | |
743 | u32 divisor = ht->divisor+1; | |
744 | RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor); | |
745 | } else { | |
746 | RTA_PUT(skb, TCA_U32_SEL, | |
747 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
748 | &n->sel); | |
749 | if (n->ht_up) { | |
750 | u32 htid = n->handle & 0xFFFFF000; | |
751 | RTA_PUT(skb, TCA_U32_HASH, 4, &htid); | |
752 | } | |
753 | if (n->res.classid) | |
754 | RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid); | |
755 | if (n->ht_down) | |
756 | RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle); | |
757 | ||
758 | #ifdef CONFIG_CLS_U32_MARK | |
759 | if (n->mark.val || n->mark.mask) | |
760 | RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark); | |
761 | #endif | |
762 | ||
763 | if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0) | |
764 | goto rtattr_failure; | |
765 | ||
766 | #ifdef CONFIG_NET_CLS_IND | |
767 | if(strlen(n->indev)) | |
768 | RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev); | |
769 | #endif | |
770 | #ifdef CONFIG_CLS_U32_PERF | |
771 | RTA_PUT(skb, TCA_U32_PCNT, | |
772 | sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64), | |
773 | n->pf); | |
774 | #endif | |
775 | } | |
776 | ||
777 | rta->rta_len = skb->tail - b; | |
778 | if (TC_U32_KEY(n->handle)) | |
779 | if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0) | |
780 | goto rtattr_failure; | |
781 | return skb->len; | |
782 | ||
783 | rtattr_failure: | |
784 | skb_trim(skb, b - skb->data); | |
785 | return -1; | |
786 | } | |
787 | ||
788 | static struct tcf_proto_ops cls_u32_ops = { | |
789 | .next = NULL, | |
790 | .kind = "u32", | |
791 | .classify = u32_classify, | |
792 | .init = u32_init, | |
793 | .destroy = u32_destroy, | |
794 | .get = u32_get, | |
795 | .put = u32_put, | |
796 | .change = u32_change, | |
797 | .delete = u32_delete, | |
798 | .walk = u32_walk, | |
799 | .dump = u32_dump, | |
800 | .owner = THIS_MODULE, | |
801 | }; | |
802 | ||
803 | static int __init init_u32(void) | |
804 | { | |
805 | printk("u32 classifier\n"); | |
806 | #ifdef CONFIG_CLS_U32_PERF | |
807 | printk(" Perfomance counters on\n"); | |
808 | #endif | |
809 | #ifdef CONFIG_NET_CLS_POLICE | |
810 | printk(" OLD policer on \n"); | |
811 | #endif | |
812 | #ifdef CONFIG_NET_CLS_IND | |
813 | printk(" input device check on \n"); | |
814 | #endif | |
815 | #ifdef CONFIG_NET_CLS_ACT | |
816 | printk(" Actions configured \n"); | |
817 | #endif | |
818 | return register_tcf_proto_ops(&cls_u32_ops); | |
819 | } | |
820 | ||
821 | static void __exit exit_u32(void) | |
822 | { | |
823 | unregister_tcf_proto_ops(&cls_u32_ops); | |
824 | } | |
825 | ||
826 | module_init(init_u32) | |
827 | module_exit(exit_u32) | |
828 | MODULE_LICENSE("GPL"); |