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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 | ||
1da177e4 LT |
33 | #include <linux/module.h> |
34 | #include <linux/types.h> | |
35 | #include <linux/kernel.h> | |
1da177e4 | 36 | #include <linux/string.h> |
1da177e4 | 37 | #include <linux/errno.h> |
1da177e4 | 38 | #include <linux/rtnetlink.h> |
1da177e4 | 39 | #include <linux/skbuff.h> |
0ba48053 | 40 | #include <net/netlink.h> |
1da177e4 LT |
41 | #include <net/act_api.h> |
42 | #include <net/pkt_cls.h> | |
43 | ||
44 | struct tc_u_knode | |
45 | { | |
46 | struct tc_u_knode *next; | |
47 | u32 handle; | |
48 | struct tc_u_hnode *ht_up; | |
49 | struct tcf_exts exts; | |
50 | #ifdef CONFIG_NET_CLS_IND | |
51 | char indev[IFNAMSIZ]; | |
52 | #endif | |
53 | u8 fshift; | |
54 | struct tcf_result res; | |
55 | struct tc_u_hnode *ht_down; | |
56 | #ifdef CONFIG_CLS_U32_PERF | |
57 | struct tc_u32_pcnt *pf; | |
58 | #endif | |
59 | #ifdef CONFIG_CLS_U32_MARK | |
60 | struct tc_u32_mark mark; | |
61 | #endif | |
62 | struct tc_u32_sel sel; | |
63 | }; | |
64 | ||
65 | struct tc_u_hnode | |
66 | { | |
67 | struct tc_u_hnode *next; | |
68 | u32 handle; | |
69 | u32 prio; | |
70 | struct tc_u_common *tp_c; | |
71 | int refcnt; | |
72 | unsigned divisor; | |
73 | struct tc_u_knode *ht[1]; | |
74 | }; | |
75 | ||
76 | struct tc_u_common | |
77 | { | |
78 | struct tc_u_common *next; | |
79 | struct tc_u_hnode *hlist; | |
80 | struct Qdisc *q; | |
81 | int refcnt; | |
82 | u32 hgenerator; | |
83 | }; | |
84 | ||
85 | static struct tcf_ext_map u32_ext_map = { | |
86 | .action = TCA_U32_ACT, | |
87 | .police = TCA_U32_POLICE | |
88 | }; | |
89 | ||
90 | static struct tc_u_common *u32_list; | |
91 | ||
92 | static __inline__ unsigned u32_hash_fold(u32 key, struct tc_u32_sel *sel, u8 fshift) | |
93 | { | |
543821c6 | 94 | unsigned h = ntohl(key & sel->hmask)>>fshift; |
1da177e4 LT |
95 | |
96 | return h; | |
97 | } | |
98 | ||
99 | static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res) | |
100 | { | |
101 | struct { | |
102 | struct tc_u_knode *knode; | |
103 | u8 *ptr; | |
104 | } stack[TC_U32_MAXDEPTH]; | |
105 | ||
106 | struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root; | |
d56f90a7 | 107 | u8 *ptr = skb_network_header(skb); |
1da177e4 LT |
108 | struct tc_u_knode *n; |
109 | int sdepth = 0; | |
110 | int off2 = 0; | |
111 | int sel = 0; | |
112 | #ifdef CONFIG_CLS_U32_PERF | |
113 | int j; | |
114 | #endif | |
115 | int i, r; | |
116 | ||
117 | next_ht: | |
118 | n = ht->ht[sel]; | |
119 | ||
120 | next_knode: | |
121 | if (n) { | |
122 | struct tc_u32_key *key = n->sel.keys; | |
123 | ||
124 | #ifdef CONFIG_CLS_U32_PERF | |
125 | n->pf->rcnt +=1; | |
126 | j = 0; | |
127 | #endif | |
128 | ||
129 | #ifdef CONFIG_CLS_U32_MARK | |
82e91ffe | 130 | if ((skb->mark & n->mark.mask) != n->mark.val) { |
1da177e4 LT |
131 | n = n->next; |
132 | goto next_knode; | |
133 | } else { | |
134 | n->mark.success++; | |
135 | } | |
136 | #endif | |
137 | ||
138 | for (i = n->sel.nkeys; i>0; i--, key++) { | |
139 | ||
140 | if ((*(u32*)(ptr+key->off+(off2&key->offmask))^key->val)&key->mask) { | |
141 | n = n->next; | |
142 | goto next_knode; | |
143 | } | |
144 | #ifdef CONFIG_CLS_U32_PERF | |
145 | n->pf->kcnts[j] +=1; | |
146 | j++; | |
147 | #endif | |
148 | } | |
149 | if (n->ht_down == NULL) { | |
150 | check_terminal: | |
151 | if (n->sel.flags&TC_U32_TERMINAL) { | |
152 | ||
153 | *res = n->res; | |
154 | #ifdef CONFIG_NET_CLS_IND | |
155 | if (!tcf_match_indev(skb, n->indev)) { | |
156 | n = n->next; | |
157 | goto next_knode; | |
158 | } | |
159 | #endif | |
160 | #ifdef CONFIG_CLS_U32_PERF | |
161 | n->pf->rhit +=1; | |
162 | #endif | |
163 | r = tcf_exts_exec(skb, &n->exts, res); | |
164 | if (r < 0) { | |
165 | n = n->next; | |
166 | goto next_knode; | |
167 | } | |
168 | ||
169 | return r; | |
170 | } | |
171 | n = n->next; | |
172 | goto next_knode; | |
173 | } | |
174 | ||
175 | /* PUSH */ | |
176 | if (sdepth >= TC_U32_MAXDEPTH) | |
177 | goto deadloop; | |
178 | stack[sdepth].knode = n; | |
179 | stack[sdepth].ptr = ptr; | |
180 | sdepth++; | |
181 | ||
182 | ht = n->ht_down; | |
183 | sel = 0; | |
184 | if (ht->divisor) | |
185 | sel = ht->divisor&u32_hash_fold(*(u32*)(ptr+n->sel.hoff), &n->sel,n->fshift); | |
186 | ||
187 | if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT))) | |
188 | goto next_ht; | |
189 | ||
190 | if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) { | |
191 | off2 = n->sel.off + 3; | |
192 | if (n->sel.flags&TC_U32_VAROFFSET) | |
193 | off2 += ntohs(n->sel.offmask & *(u16*)(ptr+n->sel.offoff)) >>n->sel.offshift; | |
194 | off2 &= ~3; | |
195 | } | |
196 | if (n->sel.flags&TC_U32_EAT) { | |
197 | ptr += off2; | |
198 | off2 = 0; | |
199 | } | |
200 | ||
27a884dc | 201 | if (ptr < skb_tail_pointer(skb)) |
1da177e4 LT |
202 | goto next_ht; |
203 | } | |
204 | ||
205 | /* POP */ | |
206 | if (sdepth--) { | |
207 | n = stack[sdepth].knode; | |
208 | ht = n->ht_up; | |
209 | ptr = stack[sdepth].ptr; | |
210 | goto check_terminal; | |
211 | } | |
212 | return -1; | |
213 | ||
214 | deadloop: | |
215 | if (net_ratelimit()) | |
216 | printk("cls_u32: dead loop\n"); | |
217 | return -1; | |
218 | } | |
219 | ||
220 | static __inline__ struct tc_u_hnode * | |
221 | u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) | |
222 | { | |
223 | struct tc_u_hnode *ht; | |
224 | ||
225 | for (ht = tp_c->hlist; ht; ht = ht->next) | |
226 | if (ht->handle == handle) | |
227 | break; | |
228 | ||
229 | return ht; | |
230 | } | |
231 | ||
232 | static __inline__ struct tc_u_knode * | |
233 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) | |
234 | { | |
235 | unsigned sel; | |
236 | struct tc_u_knode *n = NULL; | |
237 | ||
238 | sel = TC_U32_HASH(handle); | |
239 | if (sel > ht->divisor) | |
240 | goto out; | |
241 | ||
242 | for (n = ht->ht[sel]; n; n = n->next) | |
243 | if (n->handle == handle) | |
244 | break; | |
245 | out: | |
246 | return n; | |
247 | } | |
248 | ||
249 | ||
250 | static unsigned long u32_get(struct tcf_proto *tp, u32 handle) | |
251 | { | |
252 | struct tc_u_hnode *ht; | |
253 | struct tc_u_common *tp_c = tp->data; | |
254 | ||
255 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
256 | ht = tp->root; | |
257 | else | |
258 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
259 | ||
260 | if (!ht) | |
261 | return 0; | |
262 | ||
263 | if (TC_U32_KEY(handle) == 0) | |
264 | return (unsigned long)ht; | |
265 | ||
266 | return (unsigned long)u32_lookup_key(ht, handle); | |
267 | } | |
268 | ||
269 | static void u32_put(struct tcf_proto *tp, unsigned long f) | |
270 | { | |
271 | } | |
272 | ||
273 | static u32 gen_new_htid(struct tc_u_common *tp_c) | |
274 | { | |
275 | int i = 0x800; | |
276 | ||
277 | do { | |
278 | if (++tp_c->hgenerator == 0x7FF) | |
279 | tp_c->hgenerator = 1; | |
280 | } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); | |
281 | ||
282 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
283 | } | |
284 | ||
285 | static int u32_init(struct tcf_proto *tp) | |
286 | { | |
287 | struct tc_u_hnode *root_ht; | |
288 | struct tc_u_common *tp_c; | |
289 | ||
290 | for (tp_c = u32_list; tp_c; tp_c = tp_c->next) | |
291 | if (tp_c->q == tp->q) | |
292 | break; | |
293 | ||
0da974f4 | 294 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
295 | if (root_ht == NULL) |
296 | return -ENOBUFS; | |
297 | ||
1da177e4 LT |
298 | root_ht->divisor = 0; |
299 | root_ht->refcnt++; | |
300 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
301 | root_ht->prio = tp->prio; | |
302 | ||
303 | if (tp_c == NULL) { | |
0da974f4 | 304 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
305 | if (tp_c == NULL) { |
306 | kfree(root_ht); | |
307 | return -ENOBUFS; | |
308 | } | |
1da177e4 LT |
309 | tp_c->q = tp->q; |
310 | tp_c->next = u32_list; | |
311 | u32_list = tp_c; | |
312 | } | |
313 | ||
314 | tp_c->refcnt++; | |
315 | root_ht->next = tp_c->hlist; | |
316 | tp_c->hlist = root_ht; | |
317 | root_ht->tp_c = tp_c; | |
318 | ||
319 | tp->root = root_ht; | |
320 | tp->data = tp_c; | |
321 | return 0; | |
322 | } | |
323 | ||
324 | static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n) | |
325 | { | |
326 | tcf_unbind_filter(tp, &n->res); | |
327 | tcf_exts_destroy(tp, &n->exts); | |
328 | if (n->ht_down) | |
329 | n->ht_down->refcnt--; | |
330 | #ifdef CONFIG_CLS_U32_PERF | |
1ae39a43 | 331 | kfree(n->pf); |
1da177e4 LT |
332 | #endif |
333 | kfree(n); | |
334 | return 0; | |
335 | } | |
336 | ||
337 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key) | |
338 | { | |
339 | struct tc_u_knode **kp; | |
340 | struct tc_u_hnode *ht = key->ht_up; | |
341 | ||
342 | if (ht) { | |
343 | for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) { | |
344 | if (*kp == key) { | |
345 | tcf_tree_lock(tp); | |
346 | *kp = key->next; | |
347 | tcf_tree_unlock(tp); | |
348 | ||
349 | u32_destroy_key(tp, key); | |
350 | return 0; | |
351 | } | |
352 | } | |
353 | } | |
354 | BUG_TRAP(0); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
359 | { | |
360 | struct tc_u_knode *n; | |
361 | unsigned h; | |
362 | ||
363 | for (h=0; h<=ht->divisor; h++) { | |
364 | while ((n = ht->ht[h]) != NULL) { | |
365 | ht->ht[h] = n->next; | |
366 | ||
367 | u32_destroy_key(tp, n); | |
368 | } | |
369 | } | |
370 | } | |
371 | ||
372 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
373 | { | |
374 | struct tc_u_common *tp_c = tp->data; | |
375 | struct tc_u_hnode **hn; | |
376 | ||
377 | BUG_TRAP(!ht->refcnt); | |
378 | ||
379 | u32_clear_hnode(tp, ht); | |
380 | ||
381 | for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) { | |
382 | if (*hn == ht) { | |
383 | *hn = ht->next; | |
384 | kfree(ht); | |
385 | return 0; | |
386 | } | |
387 | } | |
388 | ||
389 | BUG_TRAP(0); | |
390 | return -ENOENT; | |
391 | } | |
392 | ||
393 | static void u32_destroy(struct tcf_proto *tp) | |
394 | { | |
395 | struct tc_u_common *tp_c = tp->data; | |
396 | struct tc_u_hnode *root_ht = xchg(&tp->root, NULL); | |
397 | ||
398 | BUG_TRAP(root_ht != NULL); | |
399 | ||
400 | if (root_ht && --root_ht->refcnt == 0) | |
401 | u32_destroy_hnode(tp, root_ht); | |
402 | ||
403 | if (--tp_c->refcnt == 0) { | |
404 | struct tc_u_hnode *ht; | |
405 | struct tc_u_common **tp_cp; | |
406 | ||
407 | for (tp_cp = &u32_list; *tp_cp; tp_cp = &(*tp_cp)->next) { | |
408 | if (*tp_cp == tp_c) { | |
409 | *tp_cp = tp_c->next; | |
410 | break; | |
411 | } | |
412 | } | |
413 | ||
414 | for (ht=tp_c->hlist; ht; ht = ht->next) | |
415 | u32_clear_hnode(tp, ht); | |
416 | ||
417 | while ((ht = tp_c->hlist) != NULL) { | |
418 | tp_c->hlist = ht->next; | |
419 | ||
420 | BUG_TRAP(ht->refcnt == 0); | |
421 | ||
422 | kfree(ht); | |
3ff50b79 | 423 | } |
1da177e4 LT |
424 | |
425 | kfree(tp_c); | |
426 | } | |
427 | ||
428 | tp->data = NULL; | |
429 | } | |
430 | ||
431 | static int u32_delete(struct tcf_proto *tp, unsigned long arg) | |
432 | { | |
433 | struct tc_u_hnode *ht = (struct tc_u_hnode*)arg; | |
434 | ||
435 | if (ht == NULL) | |
436 | return 0; | |
437 | ||
438 | if (TC_U32_KEY(ht->handle)) | |
439 | return u32_delete_key(tp, (struct tc_u_knode*)ht); | |
440 | ||
441 | if (tp->root == ht) | |
442 | return -EINVAL; | |
443 | ||
444 | if (--ht->refcnt == 0) | |
445 | u32_destroy_hnode(tp, ht); | |
446 | ||
447 | return 0; | |
448 | } | |
449 | ||
450 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) | |
451 | { | |
452 | struct tc_u_knode *n; | |
453 | unsigned i = 0x7FF; | |
454 | ||
455 | for (n=ht->ht[TC_U32_HASH(handle)]; n; n = n->next) | |
456 | if (i < TC_U32_NODE(n->handle)) | |
457 | i = TC_U32_NODE(n->handle); | |
458 | i++; | |
459 | ||
460 | return handle|(i>0xFFF ? 0xFFF : i); | |
461 | } | |
462 | ||
463 | static int u32_set_parms(struct tcf_proto *tp, unsigned long base, | |
464 | struct tc_u_hnode *ht, | |
add93b61 PM |
465 | struct tc_u_knode *n, struct nlattr **tb, |
466 | struct nlattr *est) | |
1da177e4 LT |
467 | { |
468 | int err; | |
469 | struct tcf_exts e; | |
470 | ||
471 | err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map); | |
472 | if (err < 0) | |
473 | return err; | |
474 | ||
475 | err = -EINVAL; | |
add93b61 PM |
476 | if (tb[TCA_U32_LINK]) { |
477 | u32 handle = *(u32*)nla_data(tb[TCA_U32_LINK]); | |
1da177e4 LT |
478 | struct tc_u_hnode *ht_down = NULL; |
479 | ||
480 | if (TC_U32_KEY(handle)) | |
481 | goto errout; | |
482 | ||
483 | if (handle) { | |
484 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
485 | ||
486 | if (ht_down == NULL) | |
487 | goto errout; | |
488 | ht_down->refcnt++; | |
489 | } | |
490 | ||
491 | tcf_tree_lock(tp); | |
492 | ht_down = xchg(&n->ht_down, ht_down); | |
493 | tcf_tree_unlock(tp); | |
494 | ||
495 | if (ht_down) | |
496 | ht_down->refcnt--; | |
497 | } | |
add93b61 PM |
498 | if (tb[TCA_U32_CLASSID]) { |
499 | n->res.classid = *(u32*)nla_data(tb[TCA_U32_CLASSID]); | |
1da177e4 LT |
500 | tcf_bind_filter(tp, &n->res, base); |
501 | } | |
502 | ||
503 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 PM |
504 | if (tb[TCA_U32_INDEV]) { |
505 | err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]); | |
1da177e4 LT |
506 | if (err < 0) |
507 | goto errout; | |
508 | } | |
509 | #endif | |
510 | tcf_exts_change(tp, &n->exts, &e); | |
511 | ||
512 | return 0; | |
513 | errout: | |
514 | tcf_exts_destroy(tp, &e); | |
515 | return err; | |
516 | } | |
517 | ||
518 | static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle, | |
add93b61 | 519 | struct nlattr **tca, |
1da177e4 LT |
520 | unsigned long *arg) |
521 | { | |
522 | struct tc_u_common *tp_c = tp->data; | |
523 | struct tc_u_hnode *ht; | |
524 | struct tc_u_knode *n; | |
525 | struct tc_u32_sel *s; | |
add93b61 PM |
526 | struct nlattr *opt = tca[TCA_OPTIONS]; |
527 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
1da177e4 LT |
528 | u32 htid; |
529 | int err; | |
530 | ||
531 | if (opt == NULL) | |
532 | return handle ? -EINVAL : 0; | |
533 | ||
cee63723 PM |
534 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, NULL); |
535 | if (err < 0) | |
536 | return err; | |
1da177e4 LT |
537 | |
538 | if ((n = (struct tc_u_knode*)*arg) != NULL) { | |
539 | if (TC_U32_KEY(n->handle) == 0) | |
540 | return -EINVAL; | |
541 | ||
add93b61 | 542 | return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]); |
1da177e4 LT |
543 | } |
544 | ||
add93b61 PM |
545 | if (tb[TCA_U32_DIVISOR]) { |
546 | unsigned divisor = *(unsigned*)nla_data(tb[TCA_U32_DIVISOR]); | |
1da177e4 LT |
547 | |
548 | if (--divisor > 0x100) | |
549 | return -EINVAL; | |
550 | if (TC_U32_KEY(handle)) | |
551 | return -EINVAL; | |
552 | if (handle == 0) { | |
553 | handle = gen_new_htid(tp->data); | |
554 | if (handle == 0) | |
555 | return -ENOMEM; | |
556 | } | |
0da974f4 | 557 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL); |
1da177e4 LT |
558 | if (ht == NULL) |
559 | return -ENOBUFS; | |
1da177e4 LT |
560 | ht->tp_c = tp_c; |
561 | ht->refcnt = 0; | |
562 | ht->divisor = divisor; | |
563 | ht->handle = handle; | |
564 | ht->prio = tp->prio; | |
565 | ht->next = tp_c->hlist; | |
566 | tp_c->hlist = ht; | |
567 | *arg = (unsigned long)ht; | |
568 | return 0; | |
569 | } | |
570 | ||
add93b61 PM |
571 | if (tb[TCA_U32_HASH]) { |
572 | htid = *(unsigned*)nla_data(tb[TCA_U32_HASH]); | |
1da177e4 LT |
573 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
574 | ht = tp->root; | |
575 | htid = ht->handle; | |
576 | } else { | |
577 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
578 | if (ht == NULL) | |
579 | return -EINVAL; | |
580 | } | |
581 | } else { | |
582 | ht = tp->root; | |
583 | htid = ht->handle; | |
584 | } | |
585 | ||
586 | if (ht->divisor < TC_U32_HASH(htid)) | |
587 | return -EINVAL; | |
588 | ||
589 | if (handle) { | |
590 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
591 | return -EINVAL; | |
592 | handle = htid | TC_U32_NODE(handle); | |
593 | } else | |
594 | handle = gen_new_kid(ht, htid); | |
595 | ||
add93b61 PM |
596 | if (tb[TCA_U32_SEL] == NULL || |
597 | nla_len(tb[TCA_U32_SEL]) < sizeof(struct tc_u32_sel)) | |
1da177e4 LT |
598 | return -EINVAL; |
599 | ||
add93b61 | 600 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 601 | |
0da974f4 | 602 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
1da177e4 LT |
603 | if (n == NULL) |
604 | return -ENOBUFS; | |
605 | ||
1da177e4 | 606 | #ifdef CONFIG_CLS_U32_PERF |
0da974f4 | 607 | n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL); |
1da177e4 LT |
608 | if (n->pf == NULL) { |
609 | kfree(n); | |
610 | return -ENOBUFS; | |
611 | } | |
1da177e4 LT |
612 | #endif |
613 | ||
614 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
615 | n->ht_up = ht; | |
616 | n->handle = handle; | |
b2268016 | 617 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
1da177e4 LT |
618 | |
619 | #ifdef CONFIG_CLS_U32_MARK | |
add93b61 | 620 | if (tb[TCA_U32_MARK]) { |
1da177e4 LT |
621 | struct tc_u32_mark *mark; |
622 | ||
add93b61 | 623 | if (nla_len(tb[TCA_U32_MARK]) < sizeof(struct tc_u32_mark)) { |
1da177e4 LT |
624 | #ifdef CONFIG_CLS_U32_PERF |
625 | kfree(n->pf); | |
626 | #endif | |
627 | kfree(n); | |
628 | return -EINVAL; | |
629 | } | |
add93b61 | 630 | mark = nla_data(tb[TCA_U32_MARK]); |
1da177e4 LT |
631 | memcpy(&n->mark, mark, sizeof(struct tc_u32_mark)); |
632 | n->mark.success = 0; | |
633 | } | |
634 | #endif | |
635 | ||
add93b61 | 636 | err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]); |
1da177e4 LT |
637 | if (err == 0) { |
638 | struct tc_u_knode **ins; | |
639 | for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next) | |
640 | if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle)) | |
641 | break; | |
642 | ||
643 | n->next = *ins; | |
644 | wmb(); | |
645 | *ins = n; | |
646 | ||
647 | *arg = (unsigned long)n; | |
648 | return 0; | |
649 | } | |
650 | #ifdef CONFIG_CLS_U32_PERF | |
1ae39a43 | 651 | kfree(n->pf); |
1da177e4 LT |
652 | #endif |
653 | kfree(n); | |
654 | return err; | |
655 | } | |
656 | ||
657 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
658 | { | |
659 | struct tc_u_common *tp_c = tp->data; | |
660 | struct tc_u_hnode *ht; | |
661 | struct tc_u_knode *n; | |
662 | unsigned h; | |
663 | ||
664 | if (arg->stop) | |
665 | return; | |
666 | ||
667 | for (ht = tp_c->hlist; ht; ht = ht->next) { | |
668 | if (ht->prio != tp->prio) | |
669 | continue; | |
670 | if (arg->count >= arg->skip) { | |
671 | if (arg->fn(tp, (unsigned long)ht, arg) < 0) { | |
672 | arg->stop = 1; | |
673 | return; | |
674 | } | |
675 | } | |
676 | arg->count++; | |
677 | for (h = 0; h <= ht->divisor; h++) { | |
678 | for (n = ht->ht[h]; n; n = n->next) { | |
679 | if (arg->count < arg->skip) { | |
680 | arg->count++; | |
681 | continue; | |
682 | } | |
683 | if (arg->fn(tp, (unsigned long)n, arg) < 0) { | |
684 | arg->stop = 1; | |
685 | return; | |
686 | } | |
687 | arg->count++; | |
688 | } | |
689 | } | |
690 | } | |
691 | } | |
692 | ||
693 | static int u32_dump(struct tcf_proto *tp, unsigned long fh, | |
694 | struct sk_buff *skb, struct tcmsg *t) | |
695 | { | |
696 | struct tc_u_knode *n = (struct tc_u_knode*)fh; | |
4b3550ef | 697 | struct nlattr *nest; |
1da177e4 LT |
698 | |
699 | if (n == NULL) | |
700 | return skb->len; | |
701 | ||
702 | t->tcm_handle = n->handle; | |
703 | ||
4b3550ef PM |
704 | nest = nla_nest_start(skb, TCA_OPTIONS); |
705 | if (nest == NULL) | |
706 | goto nla_put_failure; | |
1da177e4 LT |
707 | |
708 | if (TC_U32_KEY(n->handle) == 0) { | |
709 | struct tc_u_hnode *ht = (struct tc_u_hnode*)fh; | |
710 | u32 divisor = ht->divisor+1; | |
add93b61 | 711 | NLA_PUT(skb, TCA_U32_DIVISOR, 4, &divisor); |
1da177e4 | 712 | } else { |
add93b61 | 713 | NLA_PUT(skb, TCA_U32_SEL, |
1da177e4 LT |
714 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), |
715 | &n->sel); | |
716 | if (n->ht_up) { | |
717 | u32 htid = n->handle & 0xFFFFF000; | |
add93b61 | 718 | NLA_PUT(skb, TCA_U32_HASH, 4, &htid); |
1da177e4 LT |
719 | } |
720 | if (n->res.classid) | |
add93b61 | 721 | NLA_PUT(skb, TCA_U32_CLASSID, 4, &n->res.classid); |
1da177e4 | 722 | if (n->ht_down) |
add93b61 | 723 | NLA_PUT(skb, TCA_U32_LINK, 4, &n->ht_down->handle); |
1da177e4 LT |
724 | |
725 | #ifdef CONFIG_CLS_U32_MARK | |
726 | if (n->mark.val || n->mark.mask) | |
add93b61 | 727 | NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark); |
1da177e4 LT |
728 | #endif |
729 | ||
730 | if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0) | |
add93b61 | 731 | goto nla_put_failure; |
1da177e4 LT |
732 | |
733 | #ifdef CONFIG_NET_CLS_IND | |
734 | if(strlen(n->indev)) | |
57e1c487 | 735 | NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev); |
1da177e4 LT |
736 | #endif |
737 | #ifdef CONFIG_CLS_U32_PERF | |
add93b61 | 738 | NLA_PUT(skb, TCA_U32_PCNT, |
1da177e4 LT |
739 | sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64), |
740 | n->pf); | |
741 | #endif | |
742 | } | |
743 | ||
4b3550ef PM |
744 | nla_nest_end(skb, nest); |
745 | ||
1da177e4 LT |
746 | if (TC_U32_KEY(n->handle)) |
747 | if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0) | |
add93b61 | 748 | goto nla_put_failure; |
1da177e4 LT |
749 | return skb->len; |
750 | ||
add93b61 | 751 | nla_put_failure: |
4b3550ef | 752 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
753 | return -1; |
754 | } | |
755 | ||
2eb9d75c | 756 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
757 | .kind = "u32", |
758 | .classify = u32_classify, | |
759 | .init = u32_init, | |
760 | .destroy = u32_destroy, | |
761 | .get = u32_get, | |
762 | .put = u32_put, | |
763 | .change = u32_change, | |
764 | .delete = u32_delete, | |
765 | .walk = u32_walk, | |
766 | .dump = u32_dump, | |
767 | .owner = THIS_MODULE, | |
768 | }; | |
769 | ||
770 | static int __init init_u32(void) | |
771 | { | |
772 | printk("u32 classifier\n"); | |
773 | #ifdef CONFIG_CLS_U32_PERF | |
c0956bd2 | 774 | printk(" Performance counters on\n"); |
1da177e4 | 775 | #endif |
1da177e4 LT |
776 | #ifdef CONFIG_NET_CLS_IND |
777 | printk(" input device check on \n"); | |
778 | #endif | |
779 | #ifdef CONFIG_NET_CLS_ACT | |
780 | printk(" Actions configured \n"); | |
781 | #endif | |
782 | return register_tcf_proto_ops(&cls_u32_ops); | |
783 | } | |
784 | ||
10297b99 | 785 | static void __exit exit_u32(void) |
1da177e4 LT |
786 | { |
787 | unregister_tcf_proto_ops(&cls_u32_ops); | |
788 | } | |
789 | ||
790 | module_init(init_u32) | |
791 | module_exit(exit_u32) | |
792 | MODULE_LICENSE("GPL"); |