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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> | |
1da177e4 LT |
36 | #include <linux/module.h> |
37 | #include <linux/types.h> | |
38 | #include <linux/kernel.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/mm.h> | |
42 | #include <linux/socket.h> | |
43 | #include <linux/sockios.h> | |
44 | #include <linux/in.h> | |
45 | #include <linux/errno.h> | |
46 | #include <linux/interrupt.h> | |
47 | #include <linux/if_ether.h> | |
48 | #include <linux/inet.h> | |
49 | #include <linux/netdevice.h> | |
50 | #include <linux/etherdevice.h> | |
51 | #include <linux/notifier.h> | |
52 | #include <linux/rtnetlink.h> | |
53 | #include <net/ip.h> | |
54 | #include <net/route.h> | |
55 | #include <linux/skbuff.h> | |
56 | #include <net/sock.h> | |
57 | #include <net/act_api.h> | |
58 | #include <net/pkt_cls.h> | |
59 | ||
60 | struct tc_u_knode | |
61 | { | |
62 | struct tc_u_knode *next; | |
63 | u32 handle; | |
64 | struct tc_u_hnode *ht_up; | |
65 | struct tcf_exts exts; | |
66 | #ifdef CONFIG_NET_CLS_IND | |
67 | char indev[IFNAMSIZ]; | |
68 | #endif | |
69 | u8 fshift; | |
70 | struct tcf_result res; | |
71 | struct tc_u_hnode *ht_down; | |
72 | #ifdef CONFIG_CLS_U32_PERF | |
73 | struct tc_u32_pcnt *pf; | |
74 | #endif | |
75 | #ifdef CONFIG_CLS_U32_MARK | |
76 | struct tc_u32_mark mark; | |
77 | #endif | |
78 | struct tc_u32_sel sel; | |
79 | }; | |
80 | ||
81 | struct tc_u_hnode | |
82 | { | |
83 | struct tc_u_hnode *next; | |
84 | u32 handle; | |
85 | u32 prio; | |
86 | struct tc_u_common *tp_c; | |
87 | int refcnt; | |
88 | unsigned divisor; | |
89 | struct tc_u_knode *ht[1]; | |
90 | }; | |
91 | ||
92 | struct tc_u_common | |
93 | { | |
94 | struct tc_u_common *next; | |
95 | struct tc_u_hnode *hlist; | |
96 | struct Qdisc *q; | |
97 | int refcnt; | |
98 | u32 hgenerator; | |
99 | }; | |
100 | ||
101 | static struct tcf_ext_map u32_ext_map = { | |
102 | .action = TCA_U32_ACT, | |
103 | .police = TCA_U32_POLICE | |
104 | }; | |
105 | ||
106 | static struct tc_u_common *u32_list; | |
107 | ||
108 | static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift) | |
109 | { | |
110 | unsigned h = (key & sel->hmask)>>fshift; | |
111 | ||
112 | return h; | |
113 | } | |
114 | ||
115 | static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res) | |
116 | { | |
117 | struct { | |
118 | struct tc_u_knode *knode; | |
119 | u8 *ptr; | |
120 | } stack[TC_U32_MAXDEPTH]; | |
121 | ||
122 | struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root; | |
123 | u8 *ptr = skb->nh.raw; | |
124 | struct tc_u_knode *n; | |
125 | int sdepth = 0; | |
126 | int off2 = 0; | |
127 | int sel = 0; | |
128 | #ifdef CONFIG_CLS_U32_PERF | |
129 | int j; | |
130 | #endif | |
131 | int i, r; | |
132 | ||
133 | next_ht: | |
134 | n = ht->ht[sel]; | |
135 | ||
136 | next_knode: | |
137 | if (n) { | |
138 | struct tc_u32_key *key = n->sel.keys; | |
139 | ||
140 | #ifdef CONFIG_CLS_U32_PERF | |
141 | n->pf->rcnt +=1; | |
142 | j = 0; | |
143 | #endif | |
144 | ||
145 | #ifdef CONFIG_CLS_U32_MARK | |
146 | if ((skb->nfmark & n->mark.mask) != n->mark.val) { | |
147 | n = n->next; | |
148 | goto next_knode; | |
149 | } else { | |
150 | n->mark.success++; | |
151 | } | |
152 | #endif | |
153 | ||
154 | for (i = n->sel.nkeys; i>0; i--, key++) { | |
155 | ||
156 | if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) { | |
157 | n = n->next; | |
158 | goto next_knode; | |
159 | } | |
160 | #ifdef CONFIG_CLS_U32_PERF | |
161 | n->pf->kcnts[j] +=1; | |
162 | j++; | |
163 | #endif | |
164 | } | |
165 | if (n->ht_down == NULL) { | |
166 | check_terminal: | |
167 | if (n->sel.flags&TC_U32_TERMINAL) { | |
168 | ||
169 | *res = n->res; | |
170 | #ifdef CONFIG_NET_CLS_IND | |
171 | if (!tcf_match_indev(skb, n->indev)) { | |
172 | n = n->next; | |
173 | goto next_knode; | |
174 | } | |
175 | #endif | |
176 | #ifdef CONFIG_CLS_U32_PERF | |
177 | n->pf->rhit +=1; | |
178 | #endif | |
179 | r = tcf_exts_exec(skb, &n->exts, res); | |
180 | if (r < 0) { | |
181 | n = n->next; | |
182 | goto next_knode; | |
183 | } | |
184 | ||
185 | return r; | |
186 | } | |
187 | n = n->next; | |
188 | goto next_knode; | |
189 | } | |
190 | ||
191 | /* PUSH */ | |
192 | if (sdepth >= TC_U32_MAXDEPTH) | |
193 | goto deadloop; | |
194 | stack[sdepth].knode = n; | |
195 | stack[sdepth].ptr = ptr; | |
196 | sdepth++; | |
197 | ||
198 | ht = n->ht_down; | |
199 | sel = 0; | |
200 | if (ht->divisor) | |
201 | sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift); | |
202 | ||
203 | if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT))) | |
204 | goto next_ht; | |
205 | ||
206 | if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) { | |
207 | off2 = n->sel.off + 3; | |
208 | if (n->sel.flags&TC_U32_VAROFFSET) | |
209 | off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift; | |
210 | off2 &= ~3; | |
211 | } | |
212 | if (n->sel.flags&TC_U32_EAT) { | |
213 | ptr += off2; | |
214 | off2 = 0; | |
215 | } | |
216 | ||
217 | if (ptr < skb->tail) | |
218 | goto next_ht; | |
219 | } | |
220 | ||
221 | /* POP */ | |
222 | if (sdepth--) { | |
223 | n = stack[sdepth].knode; | |
224 | ht = n->ht_up; | |
225 | ptr = stack[sdepth].ptr; | |
226 | goto check_terminal; | |
227 | } | |
228 | return -1; | |
229 | ||
230 | deadloop: | |
231 | if (net_ratelimit()) | |
232 | printk("cls_u32: dead loop\n"); | |
233 | return -1; | |
234 | } | |
235 | ||
236 | static __inline__ struct tc_u_hnode * | |
237 | u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) | |
238 | { | |
239 | struct tc_u_hnode *ht; | |
240 | ||
241 | for (ht = tp_c->hlist; ht; ht = ht->next) | |
242 | if (ht->handle == handle) | |
243 | break; | |
244 | ||
245 | return ht; | |
246 | } | |
247 | ||
248 | static __inline__ struct tc_u_knode * | |
249 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) | |
250 | { | |
251 | unsigned sel; | |
252 | struct tc_u_knode *n = NULL; | |
253 | ||
254 | sel = TC_U32_HASH(handle); | |
255 | if (sel > ht->divisor) | |
256 | goto out; | |
257 | ||
258 | for (n = ht->ht[sel]; n; n = n->next) | |
259 | if (n->handle == handle) | |
260 | break; | |
261 | out: | |
262 | return n; | |
263 | } | |
264 | ||
265 | ||
266 | static unsigned long u32_get(struct tcf_proto *tp, u32 handle) | |
267 | { | |
268 | struct tc_u_hnode *ht; | |
269 | struct tc_u_common *tp_c = tp->data; | |
270 | ||
271 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
272 | ht = tp->root; | |
273 | else | |
274 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
275 | ||
276 | if (!ht) | |
277 | return 0; | |
278 | ||
279 | if (TC_U32_KEY(handle) == 0) | |
280 | return (unsigned long)ht; | |
281 | ||
282 | return (unsigned long)u32_lookup_key(ht, handle); | |
283 | } | |
284 | ||
285 | static void u32_put(struct tcf_proto *tp, unsigned long f) | |
286 | { | |
287 | } | |
288 | ||
289 | static u32 gen_new_htid(struct tc_u_common *tp_c) | |
290 | { | |
291 | int i = 0x800; | |
292 | ||
293 | do { | |
294 | if (++tp_c->hgenerator == 0x7FF) | |
295 | tp_c->hgenerator = 1; | |
296 | } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); | |
297 | ||
298 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
299 | } | |
300 | ||
301 | static int u32_init(struct tcf_proto *tp) | |
302 | { | |
303 | struct tc_u_hnode *root_ht; | |
304 | struct tc_u_common *tp_c; | |
305 | ||
306 | for (tp_c = u32_list; tp_c; tp_c = tp_c->next) | |
307 | if (tp_c->q == tp->q) | |
308 | break; | |
309 | ||
0da974f4 | 310 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
311 | if (root_ht == NULL) |
312 | return -ENOBUFS; | |
313 | ||
1da177e4 LT |
314 | root_ht->divisor = 0; |
315 | root_ht->refcnt++; | |
316 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
317 | root_ht->prio = tp->prio; | |
318 | ||
319 | if (tp_c == NULL) { | |
0da974f4 | 320 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
321 | if (tp_c == NULL) { |
322 | kfree(root_ht); | |
323 | return -ENOBUFS; | |
324 | } | |
1da177e4 LT |
325 | tp_c->q = tp->q; |
326 | tp_c->next = u32_list; | |
327 | u32_list = tp_c; | |
328 | } | |
329 | ||
330 | tp_c->refcnt++; | |
331 | root_ht->next = tp_c->hlist; | |
332 | tp_c->hlist = root_ht; | |
333 | root_ht->tp_c = tp_c; | |
334 | ||
335 | tp->root = root_ht; | |
336 | tp->data = tp_c; | |
337 | return 0; | |
338 | } | |
339 | ||
340 | static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n) | |
341 | { | |
342 | tcf_unbind_filter(tp, &n->res); | |
343 | tcf_exts_destroy(tp, &n->exts); | |
344 | if (n->ht_down) | |
345 | n->ht_down->refcnt--; | |
346 | #ifdef CONFIG_CLS_U32_PERF | |
1ae39a43 | 347 | kfree(n->pf); |
1da177e4 LT |
348 | #endif |
349 | kfree(n); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key) | |
354 | { | |
355 | struct tc_u_knode **kp; | |
356 | struct tc_u_hnode *ht = key->ht_up; | |
357 | ||
358 | if (ht) { | |
359 | for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) { | |
360 | if (*kp == key) { | |
361 | tcf_tree_lock(tp); | |
362 | *kp = key->next; | |
363 | tcf_tree_unlock(tp); | |
364 | ||
365 | u32_destroy_key(tp, key); | |
366 | return 0; | |
367 | } | |
368 | } | |
369 | } | |
370 | BUG_TRAP(0); | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
375 | { | |
376 | struct tc_u_knode *n; | |
377 | unsigned h; | |
378 | ||
379 | for (h=0; h<=ht->divisor; h++) { | |
380 | while ((n = ht->ht[h]) != NULL) { | |
381 | ht->ht[h] = n->next; | |
382 | ||
383 | u32_destroy_key(tp, n); | |
384 | } | |
385 | } | |
386 | } | |
387 | ||
388 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
389 | { | |
390 | struct tc_u_common *tp_c = tp->data; | |
391 | struct tc_u_hnode **hn; | |
392 | ||
393 | BUG_TRAP(!ht->refcnt); | |
394 | ||
395 | u32_clear_hnode(tp, ht); | |
396 | ||
397 | for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) { | |
398 | if (*hn == ht) { | |
399 | *hn = ht->next; | |
400 | kfree(ht); | |
401 | return 0; | |
402 | } | |
403 | } | |
404 | ||
405 | BUG_TRAP(0); | |
406 | return -ENOENT; | |
407 | } | |
408 | ||
409 | static void u32_destroy(struct tcf_proto *tp) | |
410 | { | |
411 | struct tc_u_common *tp_c = tp->data; | |
412 | struct tc_u_hnode *root_ht = xchg(&tp->root, NULL); | |
413 | ||
414 | BUG_TRAP(root_ht != NULL); | |
415 | ||
416 | if (root_ht && --root_ht->refcnt == 0) | |
417 | u32_destroy_hnode(tp, root_ht); | |
418 | ||
419 | if (--tp_c->refcnt == 0) { | |
420 | struct tc_u_hnode *ht; | |
421 | struct tc_u_common **tp_cp; | |
422 | ||
423 | for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) { | |
424 | if (*tp_cp == tp_c) { | |
425 | *tp_cp = tp_c->next; | |
426 | break; | |
427 | } | |
428 | } | |
429 | ||
430 | for (ht=tp_c->hlist; ht; ht = ht->next) | |
431 | u32_clear_hnode(tp, ht); | |
432 | ||
433 | while ((ht = tp_c->hlist) != NULL) { | |
434 | tp_c->hlist = ht->next; | |
435 | ||
436 | BUG_TRAP(ht->refcnt == 0); | |
437 | ||
438 | kfree(ht); | |
439 | }; | |
440 | ||
441 | kfree(tp_c); | |
442 | } | |
443 | ||
444 | tp->data = NULL; | |
445 | } | |
446 | ||
447 | static int u32_delete(struct tcf_proto *tp, unsigned long arg) | |
448 | { | |
449 | struct tc_u_hnode *ht = (struct tc_u_hnode*)arg; | |
450 | ||
451 | if (ht == NULL) | |
452 | return 0; | |
453 | ||
454 | if (TC_U32_KEY(ht->handle)) | |
455 | return u32_delete_key(tp, (struct tc_u_knode*)ht); | |
456 | ||
457 | if (tp->root == ht) | |
458 | return -EINVAL; | |
459 | ||
460 | if (--ht->refcnt == 0) | |
461 | u32_destroy_hnode(tp, ht); | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) | |
467 | { | |
468 | struct tc_u_knode *n; | |
469 | unsigned i = 0x7FF; | |
470 | ||
471 | for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next) | |
472 | if (i < TC_U32_NODE(n->handle)) | |
473 | i = TC_U32_NODE(n->handle); | |
474 | i++; | |
475 | ||
476 | return handle|(i>0xFFF ? 0xFFF : i); | |
477 | } | |
478 | ||
479 | static int u32_set_parms(struct tcf_proto *tp, unsigned long base, | |
480 | struct tc_u_hnode *ht, | |
481 | struct tc_u_knode *n, struct rtattr **tb, | |
482 | struct rtattr *est) | |
483 | { | |
484 | int err; | |
485 | struct tcf_exts e; | |
486 | ||
487 | err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map); | |
488 | if (err < 0) | |
489 | return err; | |
490 | ||
491 | err = -EINVAL; | |
492 | if (tb[TCA_U32_LINK-1]) { | |
493 | u32 handle = *(u32*)RTA_DATA(tb[TCA_U32_LINK-1]); | |
494 | struct tc_u_hnode *ht_down = NULL; | |
495 | ||
496 | if (TC_U32_KEY(handle)) | |
497 | goto errout; | |
498 | ||
499 | if (handle) { | |
500 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
501 | ||
502 | if (ht_down == NULL) | |
503 | goto errout; | |
504 | ht_down->refcnt++; | |
505 | } | |
506 | ||
507 | tcf_tree_lock(tp); | |
508 | ht_down = xchg(&n->ht_down, ht_down); | |
509 | tcf_tree_unlock(tp); | |
510 | ||
511 | if (ht_down) | |
512 | ht_down->refcnt--; | |
513 | } | |
514 | if (tb[TCA_U32_CLASSID-1]) { | |
515 | n->res.classid = *(u32*)RTA_DATA(tb[TCA_U32_CLASSID-1]); | |
516 | tcf_bind_filter(tp, &n->res, base); | |
517 | } | |
518 | ||
519 | #ifdef CONFIG_NET_CLS_IND | |
520 | if (tb[TCA_U32_INDEV-1]) { | |
521 | int err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV-1]); | |
522 | if (err < 0) | |
523 | goto errout; | |
524 | } | |
525 | #endif | |
526 | tcf_exts_change(tp, &n->exts, &e); | |
527 | ||
528 | return 0; | |
529 | errout: | |
530 | tcf_exts_destroy(tp, &e); | |
531 | return err; | |
532 | } | |
533 | ||
534 | static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle, | |
535 | struct rtattr **tca, | |
536 | unsigned long *arg) | |
537 | { | |
538 | struct tc_u_common *tp_c = tp->data; | |
539 | struct tc_u_hnode *ht; | |
540 | struct tc_u_knode *n; | |
541 | struct tc_u32_sel *s; | |
542 | struct rtattr *opt = tca[TCA_OPTIONS-1]; | |
543 | struct rtattr *tb[TCA_U32_MAX]; | |
544 | u32 htid; | |
545 | int err; | |
546 | ||
547 | if (opt == NULL) | |
548 | return handle ? -EINVAL : 0; | |
549 | ||
550 | if (rtattr_parse_nested(tb, TCA_U32_MAX, opt) < 0) | |
551 | return -EINVAL; | |
552 | ||
553 | if ((n = (struct tc_u_knode*)*arg) != NULL) { | |
554 | if (TC_U32_KEY(n->handle) == 0) | |
555 | return -EINVAL; | |
556 | ||
557 | return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE-1]); | |
558 | } | |
559 | ||
560 | if (tb[TCA_U32_DIVISOR-1]) { | |
561 | unsigned divisor = *(unsigned*)RTA_DATA(tb[TCA_U32_DIVISOR-1]); | |
562 | ||
563 | if (--divisor > 0x100) | |
564 | return -EINVAL; | |
565 | if (TC_U32_KEY(handle)) | |
566 | return -EINVAL; | |
567 | if (handle == 0) { | |
568 | handle = gen_new_htid(tp->data); | |
569 | if (handle == 0) | |
570 | return -ENOMEM; | |
571 | } | |
0da974f4 | 572 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL); |
1da177e4 LT |
573 | if (ht == NULL) |
574 | return -ENOBUFS; | |
1da177e4 LT |
575 | ht->tp_c = tp_c; |
576 | ht->refcnt = 0; | |
577 | ht->divisor = divisor; | |
578 | ht->handle = handle; | |
579 | ht->prio = tp->prio; | |
580 | ht->next = tp_c->hlist; | |
581 | tp_c->hlist = ht; | |
582 | *arg = (unsigned long)ht; | |
583 | return 0; | |
584 | } | |
585 | ||
586 | if (tb[TCA_U32_HASH-1]) { | |
587 | htid = *(unsigned*)RTA_DATA(tb[TCA_U32_HASH-1]); | |
588 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { | |
589 | ht = tp->root; | |
590 | htid = ht->handle; | |
591 | } else { | |
592 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
593 | if (ht == NULL) | |
594 | return -EINVAL; | |
595 | } | |
596 | } else { | |
597 | ht = tp->root; | |
598 | htid = ht->handle; | |
599 | } | |
600 | ||
601 | if (ht->divisor < TC_U32_HASH(htid)) | |
602 | return -EINVAL; | |
603 | ||
604 | if (handle) { | |
605 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
606 | return -EINVAL; | |
607 | handle = htid | TC_U32_NODE(handle); | |
608 | } else | |
609 | handle = gen_new_kid(ht, htid); | |
610 | ||
611 | if (tb[TCA_U32_SEL-1] == 0 || | |
612 | RTA_PAYLOAD(tb[TCA_U32_SEL-1]) < sizeof(struct tc_u32_sel)) | |
613 | return -EINVAL; | |
614 | ||
615 | s = RTA_DATA(tb[TCA_U32_SEL-1]); | |
616 | ||
0da974f4 | 617 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
1da177e4 LT |
618 | if (n == NULL) |
619 | return -ENOBUFS; | |
620 | ||
1da177e4 | 621 | #ifdef CONFIG_CLS_U32_PERF |
0da974f4 | 622 | n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL); |
1da177e4 LT |
623 | if (n->pf == NULL) { |
624 | kfree(n); | |
625 | return -ENOBUFS; | |
626 | } | |
1da177e4 LT |
627 | #endif |
628 | ||
629 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
630 | n->ht_up = ht; | |
631 | n->handle = handle; | |
632 | { | |
633 | u8 i = 0; | |
634 | u32 mask = s->hmask; | |
635 | if (mask) { | |
636 | while (!(mask & 1)) { | |
637 | i++; | |
638 | mask>>=1; | |
639 | } | |
640 | } | |
641 | n->fshift = i; | |
642 | } | |
643 | ||
644 | #ifdef CONFIG_CLS_U32_MARK | |
645 | if (tb[TCA_U32_MARK-1]) { | |
646 | struct tc_u32_mark *mark; | |
647 | ||
648 | if (RTA_PAYLOAD(tb[TCA_U32_MARK-1]) < sizeof(struct tc_u32_mark)) { | |
649 | #ifdef CONFIG_CLS_U32_PERF | |
650 | kfree(n->pf); | |
651 | #endif | |
652 | kfree(n); | |
653 | return -EINVAL; | |
654 | } | |
655 | mark = RTA_DATA(tb[TCA_U32_MARK-1]); | |
656 | memcpy(&n->mark, mark, sizeof(struct tc_u32_mark)); | |
657 | n->mark.success = 0; | |
658 | } | |
659 | #endif | |
660 | ||
661 | err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE-1]); | |
662 | if (err == 0) { | |
663 | struct tc_u_knode **ins; | |
664 | for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next) | |
665 | if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle)) | |
666 | break; | |
667 | ||
668 | n->next = *ins; | |
669 | wmb(); | |
670 | *ins = n; | |
671 | ||
672 | *arg = (unsigned long)n; | |
673 | return 0; | |
674 | } | |
675 | #ifdef CONFIG_CLS_U32_PERF | |
1ae39a43 | 676 | kfree(n->pf); |
1da177e4 LT |
677 | #endif |
678 | kfree(n); | |
679 | return err; | |
680 | } | |
681 | ||
682 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
683 | { | |
684 | struct tc_u_common *tp_c = tp->data; | |
685 | struct tc_u_hnode *ht; | |
686 | struct tc_u_knode *n; | |
687 | unsigned h; | |
688 | ||
689 | if (arg->stop) | |
690 | return; | |
691 | ||
692 | for (ht = tp_c->hlist; ht; ht = ht->next) { | |
693 | if (ht->prio != tp->prio) | |
694 | continue; | |
695 | if (arg->count >= arg->skip) { | |
696 | if (arg->fn(tp, (unsigned long)ht, arg) < 0) { | |
697 | arg->stop = 1; | |
698 | return; | |
699 | } | |
700 | } | |
701 | arg->count++; | |
702 | for (h = 0; h <= ht->divisor; h++) { | |
703 | for (n = ht->ht[h]; n; n = n->next) { | |
704 | if (arg->count < arg->skip) { | |
705 | arg->count++; | |
706 | continue; | |
707 | } | |
708 | if (arg->fn(tp, (unsigned long)n, arg) < 0) { | |
709 | arg->stop = 1; | |
710 | return; | |
711 | } | |
712 | arg->count++; | |
713 | } | |
714 | } | |
715 | } | |
716 | } | |
717 | ||
718 | static int u32_dump(struct tcf_proto *tp, unsigned long fh, | |
719 | struct sk_buff *skb, struct tcmsg *t) | |
720 | { | |
721 | struct tc_u_knode *n = (struct tc_u_knode*)fh; | |
722 | unsigned char *b = skb->tail; | |
723 | struct rtattr *rta; | |
724 | ||
725 | if (n == NULL) | |
726 | return skb->len; | |
727 | ||
728 | t->tcm_handle = n->handle; | |
729 | ||
730 | rta = (struct rtattr*)b; | |
731 | RTA_PUT(skb, TCA_OPTIONS, 0, NULL); | |
732 | ||
733 | if (TC_U32_KEY(n->handle) == 0) { | |
734 | struct tc_u_hnode *ht = (struct tc_u_hnode*)fh; | |
735 | u32 divisor = ht->divisor+1; | |
736 | RTA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor); | |
737 | } else { | |
738 | RTA_PUT(skb, TCA_U32_SEL, | |
739 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
740 | &n->sel); | |
741 | if (n->ht_up) { | |
742 | u32 htid = n->handle & 0xFFFFF000; | |
743 | RTA_PUT(skb, TCA_U32_HASH, 4, &htid); | |
744 | } | |
745 | if (n->res.classid) | |
746 | RTA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid); | |
747 | if (n->ht_down) | |
748 | RTA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle); | |
749 | ||
750 | #ifdef CONFIG_CLS_U32_MARK | |
751 | if (n->mark.val || n->mark.mask) | |
752 | RTA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark); | |
753 | #endif | |
754 | ||
755 | if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0) | |
756 | goto rtattr_failure; | |
757 | ||
758 | #ifdef CONFIG_NET_CLS_IND | |
759 | if(strlen(n->indev)) | |
760 | RTA_PUT(skb, TCA_U32_INDEV, IFNAMSIZ, n->indev); | |
761 | #endif | |
762 | #ifdef CONFIG_CLS_U32_PERF | |
763 | RTA_PUT(skb, TCA_U32_PCNT, | |
764 | sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64), | |
765 | n->pf); | |
766 | #endif | |
767 | } | |
768 | ||
769 | rta->rta_len = skb->tail - b; | |
770 | if (TC_U32_KEY(n->handle)) | |
771 | if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0) | |
772 | goto rtattr_failure; | |
773 | return skb->len; | |
774 | ||
775 | rtattr_failure: | |
776 | skb_trim(skb, b - skb->data); | |
777 | return -1; | |
778 | } | |
779 | ||
780 | static struct tcf_proto_ops cls_u32_ops = { | |
781 | .next = NULL, | |
782 | .kind = "u32", | |
783 | .classify = u32_classify, | |
784 | .init = u32_init, | |
785 | .destroy = u32_destroy, | |
786 | .get = u32_get, | |
787 | .put = u32_put, | |
788 | .change = u32_change, | |
789 | .delete = u32_delete, | |
790 | .walk = u32_walk, | |
791 | .dump = u32_dump, | |
792 | .owner = THIS_MODULE, | |
793 | }; | |
794 | ||
795 | static int __init init_u32(void) | |
796 | { | |
797 | printk("u32 classifier\n"); | |
798 | #ifdef CONFIG_CLS_U32_PERF | |
c0956bd2 | 799 | printk(" Performance counters on\n"); |
1da177e4 LT |
800 | #endif |
801 | #ifdef CONFIG_NET_CLS_POLICE | |
802 | printk(" OLD policer on \n"); | |
803 | #endif | |
804 | #ifdef CONFIG_NET_CLS_IND | |
805 | printk(" input device check on \n"); | |
806 | #endif | |
807 | #ifdef CONFIG_NET_CLS_ACT | |
808 | printk(" Actions configured \n"); | |
809 | #endif | |
810 | return register_tcf_proto_ops(&cls_u32_ops); | |
811 | } | |
812 | ||
813 | static void __exit exit_u32(void) | |
814 | { | |
815 | unregister_tcf_proto_ops(&cls_u32_ops); | |
816 | } | |
817 | ||
818 | module_init(init_u32) | |
819 | module_exit(exit_u32) | |
820 | MODULE_LICENSE("GPL"); |