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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 | 33 | #include <linux/module.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
1da177e4 LT |
35 | #include <linux/types.h> |
36 | #include <linux/kernel.h> | |
1da177e4 | 37 | #include <linux/string.h> |
1da177e4 | 38 | #include <linux/errno.h> |
1da177e4 | 39 | #include <linux/rtnetlink.h> |
1da177e4 | 40 | #include <linux/skbuff.h> |
0ba48053 | 41 | #include <net/netlink.h> |
1da177e4 LT |
42 | #include <net/act_api.h> |
43 | #include <net/pkt_cls.h> | |
44 | ||
45 | struct tc_u_knode | |
46 | { | |
47 | struct tc_u_knode *next; | |
48 | u32 handle; | |
49 | struct tc_u_hnode *ht_up; | |
50 | struct tcf_exts exts; | |
51 | #ifdef CONFIG_NET_CLS_IND | |
52 | char indev[IFNAMSIZ]; | |
53 | #endif | |
54 | u8 fshift; | |
55 | struct tcf_result res; | |
56 | struct tc_u_hnode *ht_down; | |
57 | #ifdef CONFIG_CLS_U32_PERF | |
58 | struct tc_u32_pcnt *pf; | |
59 | #endif | |
60 | #ifdef CONFIG_CLS_U32_MARK | |
61 | struct tc_u32_mark mark; | |
62 | #endif | |
63 | struct tc_u32_sel sel; | |
64 | }; | |
65 | ||
66 | struct tc_u_hnode | |
67 | { | |
68 | struct tc_u_hnode *next; | |
69 | u32 handle; | |
70 | u32 prio; | |
71 | struct tc_u_common *tp_c; | |
72 | int refcnt; | |
73 | unsigned divisor; | |
74 | struct tc_u_knode *ht[1]; | |
75 | }; | |
76 | ||
77 | struct tc_u_common | |
78 | { | |
1da177e4 LT |
79 | struct tc_u_hnode *hlist; |
80 | struct Qdisc *q; | |
81 | int refcnt; | |
82 | u32 hgenerator; | |
83 | }; | |
84 | ||
5239008b | 85 | static const struct tcf_ext_map u32_ext_map = { |
1da177e4 LT |
86 | .action = TCA_U32_ACT, |
87 | .police = TCA_U32_POLICE | |
88 | }; | |
89 | ||
0382b9c3 | 90 | static __inline__ unsigned u32_hash_fold(__be32 key, struct tc_u32_sel *sel, u8 fshift) |
1da177e4 | 91 | { |
543821c6 | 92 | unsigned h = ntohl(key & sel->hmask)>>fshift; |
1da177e4 LT |
93 | |
94 | return h; | |
95 | } | |
96 | ||
97 | static int u32_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res) | |
98 | { | |
99 | struct { | |
100 | struct tc_u_knode *knode; | |
fbc2e7d9 | 101 | unsigned int off; |
1da177e4 LT |
102 | } stack[TC_U32_MAXDEPTH]; |
103 | ||
104 | struct tc_u_hnode *ht = (struct tc_u_hnode*)tp->root; | |
fbc2e7d9 | 105 | unsigned int off = skb_network_offset(skb); |
1da177e4 LT |
106 | struct tc_u_knode *n; |
107 | int sdepth = 0; | |
108 | int off2 = 0; | |
109 | int sel = 0; | |
110 | #ifdef CONFIG_CLS_U32_PERF | |
111 | int j; | |
112 | #endif | |
113 | int i, r; | |
114 | ||
115 | next_ht: | |
116 | n = ht->ht[sel]; | |
117 | ||
118 | next_knode: | |
119 | if (n) { | |
120 | struct tc_u32_key *key = n->sel.keys; | |
121 | ||
122 | #ifdef CONFIG_CLS_U32_PERF | |
123 | n->pf->rcnt +=1; | |
124 | j = 0; | |
125 | #endif | |
126 | ||
127 | #ifdef CONFIG_CLS_U32_MARK | |
82e91ffe | 128 | if ((skb->mark & n->mark.mask) != n->mark.val) { |
1da177e4 LT |
129 | n = n->next; |
130 | goto next_knode; | |
131 | } else { | |
132 | n->mark.success++; | |
133 | } | |
134 | #endif | |
135 | ||
136 | for (i = n->sel.nkeys; i>0; i--, key++) { | |
66d50d25 | 137 | int toff = off + key->off + (off2 & key->offmask); |
fbc2e7d9 CG |
138 | __be32 *data, _data; |
139 | ||
4e18b3ed | 140 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 141 | goto out; |
142 | ||
fbc2e7d9 CG |
143 | data = skb_header_pointer(skb, toff, 4, &_data); |
144 | if (!data) | |
145 | goto out; | |
146 | if ((*data ^ key->val) & key->mask) { | |
1da177e4 LT |
147 | n = n->next; |
148 | goto next_knode; | |
149 | } | |
150 | #ifdef CONFIG_CLS_U32_PERF | |
151 | n->pf->kcnts[j] +=1; | |
152 | j++; | |
153 | #endif | |
154 | } | |
155 | if (n->ht_down == NULL) { | |
156 | check_terminal: | |
157 | if (n->sel.flags&TC_U32_TERMINAL) { | |
158 | ||
159 | *res = n->res; | |
160 | #ifdef CONFIG_NET_CLS_IND | |
161 | if (!tcf_match_indev(skb, n->indev)) { | |
162 | n = n->next; | |
163 | goto next_knode; | |
164 | } | |
165 | #endif | |
166 | #ifdef CONFIG_CLS_U32_PERF | |
167 | n->pf->rhit +=1; | |
168 | #endif | |
169 | r = tcf_exts_exec(skb, &n->exts, res); | |
170 | if (r < 0) { | |
171 | n = n->next; | |
172 | goto next_knode; | |
173 | } | |
174 | ||
175 | return r; | |
176 | } | |
177 | n = n->next; | |
178 | goto next_knode; | |
179 | } | |
180 | ||
181 | /* PUSH */ | |
182 | if (sdepth >= TC_U32_MAXDEPTH) | |
183 | goto deadloop; | |
184 | stack[sdepth].knode = n; | |
fbc2e7d9 | 185 | stack[sdepth].off = off; |
1da177e4 LT |
186 | sdepth++; |
187 | ||
188 | ht = n->ht_down; | |
189 | sel = 0; | |
fbc2e7d9 CG |
190 | if (ht->divisor) { |
191 | __be32 *data, _data; | |
192 | ||
193 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
194 | &_data); | |
195 | if (!data) | |
196 | goto out; | |
197 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
198 | n->fshift); | |
199 | } | |
1da177e4 LT |
200 | if (!(n->sel.flags&(TC_U32_VAROFFSET|TC_U32_OFFSET|TC_U32_EAT))) |
201 | goto next_ht; | |
202 | ||
203 | if (n->sel.flags&(TC_U32_OFFSET|TC_U32_VAROFFSET)) { | |
204 | off2 = n->sel.off + 3; | |
fbc2e7d9 CG |
205 | if (n->sel.flags & TC_U32_VAROFFSET) { |
206 | __be16 *data, _data; | |
207 | ||
208 | data = skb_header_pointer(skb, | |
209 | off + n->sel.offoff, | |
210 | 2, &_data); | |
211 | if (!data) | |
212 | goto out; | |
213 | off2 += ntohs(n->sel.offmask & *data) >> | |
214 | n->sel.offshift; | |
215 | } | |
1da177e4 LT |
216 | off2 &= ~3; |
217 | } | |
218 | if (n->sel.flags&TC_U32_EAT) { | |
fbc2e7d9 | 219 | off += off2; |
1da177e4 LT |
220 | off2 = 0; |
221 | } | |
222 | ||
fbc2e7d9 | 223 | if (off < skb->len) |
1da177e4 LT |
224 | goto next_ht; |
225 | } | |
226 | ||
227 | /* POP */ | |
228 | if (sdepth--) { | |
229 | n = stack[sdepth].knode; | |
230 | ht = n->ht_up; | |
fbc2e7d9 | 231 | off = stack[sdepth].off; |
1da177e4 LT |
232 | goto check_terminal; |
233 | } | |
fbc2e7d9 | 234 | out: |
1da177e4 LT |
235 | return -1; |
236 | ||
237 | deadloop: | |
238 | if (net_ratelimit()) | |
6ff9c364 | 239 | printk(KERN_WARNING "cls_u32: dead loop\n"); |
1da177e4 LT |
240 | return -1; |
241 | } | |
242 | ||
243 | static __inline__ struct tc_u_hnode * | |
244 | u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) | |
245 | { | |
246 | struct tc_u_hnode *ht; | |
247 | ||
248 | for (ht = tp_c->hlist; ht; ht = ht->next) | |
249 | if (ht->handle == handle) | |
250 | break; | |
251 | ||
252 | return ht; | |
253 | } | |
254 | ||
255 | static __inline__ struct tc_u_knode * | |
256 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) | |
257 | { | |
258 | unsigned sel; | |
259 | struct tc_u_knode *n = NULL; | |
260 | ||
261 | sel = TC_U32_HASH(handle); | |
262 | if (sel > ht->divisor) | |
263 | goto out; | |
264 | ||
265 | for (n = ht->ht[sel]; n; n = n->next) | |
266 | if (n->handle == handle) | |
267 | break; | |
268 | out: | |
269 | return n; | |
270 | } | |
271 | ||
272 | ||
273 | static unsigned long u32_get(struct tcf_proto *tp, u32 handle) | |
274 | { | |
275 | struct tc_u_hnode *ht; | |
276 | struct tc_u_common *tp_c = tp->data; | |
277 | ||
278 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
279 | ht = tp->root; | |
280 | else | |
281 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
282 | ||
283 | if (!ht) | |
284 | return 0; | |
285 | ||
286 | if (TC_U32_KEY(handle) == 0) | |
287 | return (unsigned long)ht; | |
288 | ||
289 | return (unsigned long)u32_lookup_key(ht, handle); | |
290 | } | |
291 | ||
292 | static void u32_put(struct tcf_proto *tp, unsigned long f) | |
293 | { | |
294 | } | |
295 | ||
296 | static u32 gen_new_htid(struct tc_u_common *tp_c) | |
297 | { | |
298 | int i = 0x800; | |
299 | ||
300 | do { | |
301 | if (++tp_c->hgenerator == 0x7FF) | |
302 | tp_c->hgenerator = 1; | |
303 | } while (--i>0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); | |
304 | ||
305 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
306 | } | |
307 | ||
308 | static int u32_init(struct tcf_proto *tp) | |
309 | { | |
310 | struct tc_u_hnode *root_ht; | |
311 | struct tc_u_common *tp_c; | |
312 | ||
72b25a91 | 313 | tp_c = tp->q->u32_node; |
1da177e4 | 314 | |
0da974f4 | 315 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
316 | if (root_ht == NULL) |
317 | return -ENOBUFS; | |
318 | ||
1da177e4 LT |
319 | root_ht->divisor = 0; |
320 | root_ht->refcnt++; | |
321 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
322 | root_ht->prio = tp->prio; | |
323 | ||
324 | if (tp_c == NULL) { | |
0da974f4 | 325 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
326 | if (tp_c == NULL) { |
327 | kfree(root_ht); | |
328 | return -ENOBUFS; | |
329 | } | |
1da177e4 | 330 | tp_c->q = tp->q; |
72b25a91 | 331 | tp->q->u32_node = tp_c; |
1da177e4 LT |
332 | } |
333 | ||
334 | tp_c->refcnt++; | |
335 | root_ht->next = tp_c->hlist; | |
336 | tp_c->hlist = root_ht; | |
337 | root_ht->tp_c = tp_c; | |
338 | ||
339 | tp->root = root_ht; | |
340 | tp->data = tp_c; | |
341 | return 0; | |
342 | } | |
343 | ||
344 | static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n) | |
345 | { | |
346 | tcf_unbind_filter(tp, &n->res); | |
347 | tcf_exts_destroy(tp, &n->exts); | |
348 | if (n->ht_down) | |
349 | n->ht_down->refcnt--; | |
350 | #ifdef CONFIG_CLS_U32_PERF | |
1ae39a43 | 351 | kfree(n->pf); |
1da177e4 LT |
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 | } | |
547b792c | 374 | WARN_ON(1); |
1da177e4 LT |
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 | ||
547b792c | 397 | WARN_ON(ht->refcnt); |
1da177e4 LT |
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 | ||
547b792c | 409 | WARN_ON(1); |
1da177e4 LT |
410 | return -ENOENT; |
411 | } | |
412 | ||
413 | static void u32_destroy(struct tcf_proto *tp) | |
414 | { | |
415 | struct tc_u_common *tp_c = tp->data; | |
47a1a1d4 | 416 | struct tc_u_hnode *root_ht = tp->root; |
1da177e4 | 417 | |
547b792c | 418 | WARN_ON(root_ht == NULL); |
1da177e4 LT |
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; | |
1da177e4 | 425 | |
72b25a91 | 426 | tp->q->u32_node = NULL; |
1da177e4 | 427 | |
e56cfad1 JP |
428 | for (ht = tp_c->hlist; ht; ht = ht->next) { |
429 | ht->refcnt--; | |
1da177e4 | 430 | u32_clear_hnode(tp, ht); |
e56cfad1 | 431 | } |
1da177e4 LT |
432 | |
433 | while ((ht = tp_c->hlist) != NULL) { | |
434 | tp_c->hlist = ht->next; | |
435 | ||
547b792c | 436 | WARN_ON(ht->refcnt != 0); |
1da177e4 LT |
437 | |
438 | kfree(ht); | |
3ff50b79 | 439 | } |
1da177e4 LT |
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 | ||
e56cfad1 JP |
460 | if (ht->refcnt == 1) { |
461 | ht->refcnt--; | |
1da177e4 | 462 | u32_destroy_hnode(tp, ht); |
e56cfad1 JP |
463 | } else { |
464 | return -EBUSY; | |
465 | } | |
1da177e4 LT |
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 | ||
6fa8c014 PM |
483 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
484 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
485 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
486 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
487 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
488 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
489 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
490 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
491 | }; | |
492 | ||
1da177e4 LT |
493 | static int u32_set_parms(struct tcf_proto *tp, unsigned long base, |
494 | struct tc_u_hnode *ht, | |
add93b61 PM |
495 | struct tc_u_knode *n, struct nlattr **tb, |
496 | struct nlattr *est) | |
1da177e4 LT |
497 | { |
498 | int err; | |
499 | struct tcf_exts e; | |
500 | ||
501 | err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map); | |
502 | if (err < 0) | |
503 | return err; | |
504 | ||
505 | err = -EINVAL; | |
add93b61 | 506 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 507 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 508 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 LT |
509 | |
510 | if (TC_U32_KEY(handle)) | |
511 | goto errout; | |
512 | ||
513 | if (handle) { | |
514 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
515 | ||
516 | if (ht_down == NULL) | |
517 | goto errout; | |
518 | ht_down->refcnt++; | |
519 | } | |
520 | ||
521 | tcf_tree_lock(tp); | |
47a1a1d4 PM |
522 | ht_old = n->ht_down; |
523 | n->ht_down = ht_down; | |
1da177e4 LT |
524 | tcf_tree_unlock(tp); |
525 | ||
47a1a1d4 PM |
526 | if (ht_old) |
527 | ht_old->refcnt--; | |
1da177e4 | 528 | } |
add93b61 | 529 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 530 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
531 | tcf_bind_filter(tp, &n->res, base); |
532 | } | |
533 | ||
534 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 PM |
535 | if (tb[TCA_U32_INDEV]) { |
536 | err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]); | |
1da177e4 LT |
537 | if (err < 0) |
538 | goto errout; | |
539 | } | |
540 | #endif | |
541 | tcf_exts_change(tp, &n->exts, &e); | |
542 | ||
543 | return 0; | |
544 | errout: | |
545 | tcf_exts_destroy(tp, &e); | |
546 | return err; | |
547 | } | |
548 | ||
549 | static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle, | |
add93b61 | 550 | struct nlattr **tca, |
1da177e4 LT |
551 | unsigned long *arg) |
552 | { | |
553 | struct tc_u_common *tp_c = tp->data; | |
554 | struct tc_u_hnode *ht; | |
555 | struct tc_u_knode *n; | |
556 | struct tc_u32_sel *s; | |
add93b61 PM |
557 | struct nlattr *opt = tca[TCA_OPTIONS]; |
558 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
1da177e4 LT |
559 | u32 htid; |
560 | int err; | |
561 | ||
562 | if (opt == NULL) | |
563 | return handle ? -EINVAL : 0; | |
564 | ||
6fa8c014 | 565 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy); |
cee63723 PM |
566 | if (err < 0) |
567 | return err; | |
1da177e4 LT |
568 | |
569 | if ((n = (struct tc_u_knode*)*arg) != NULL) { | |
570 | if (TC_U32_KEY(n->handle) == 0) | |
571 | return -EINVAL; | |
572 | ||
add93b61 | 573 | return u32_set_parms(tp, base, n->ht_up, n, tb, tca[TCA_RATE]); |
1da177e4 LT |
574 | } |
575 | ||
add93b61 | 576 | if (tb[TCA_U32_DIVISOR]) { |
1587bac4 | 577 | unsigned divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); |
1da177e4 LT |
578 | |
579 | if (--divisor > 0x100) | |
580 | return -EINVAL; | |
581 | if (TC_U32_KEY(handle)) | |
582 | return -EINVAL; | |
583 | if (handle == 0) { | |
584 | handle = gen_new_htid(tp->data); | |
585 | if (handle == 0) | |
586 | return -ENOMEM; | |
587 | } | |
0da974f4 | 588 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void*), GFP_KERNEL); |
1da177e4 LT |
589 | if (ht == NULL) |
590 | return -ENOBUFS; | |
1da177e4 | 591 | ht->tp_c = tp_c; |
e56cfad1 | 592 | ht->refcnt = 1; |
1da177e4 LT |
593 | ht->divisor = divisor; |
594 | ht->handle = handle; | |
595 | ht->prio = tp->prio; | |
596 | ht->next = tp_c->hlist; | |
597 | tp_c->hlist = ht; | |
598 | *arg = (unsigned long)ht; | |
599 | return 0; | |
600 | } | |
601 | ||
add93b61 | 602 | if (tb[TCA_U32_HASH]) { |
1587bac4 | 603 | htid = nla_get_u32(tb[TCA_U32_HASH]); |
1da177e4 LT |
604 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
605 | ht = tp->root; | |
606 | htid = ht->handle; | |
607 | } else { | |
608 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
609 | if (ht == NULL) | |
610 | return -EINVAL; | |
611 | } | |
612 | } else { | |
613 | ht = tp->root; | |
614 | htid = ht->handle; | |
615 | } | |
616 | ||
617 | if (ht->divisor < TC_U32_HASH(htid)) | |
618 | return -EINVAL; | |
619 | ||
620 | if (handle) { | |
621 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
622 | return -EINVAL; | |
623 | handle = htid | TC_U32_NODE(handle); | |
624 | } else | |
625 | handle = gen_new_kid(ht, htid); | |
626 | ||
6fa8c014 | 627 | if (tb[TCA_U32_SEL] == NULL) |
1da177e4 LT |
628 | return -EINVAL; |
629 | ||
add93b61 | 630 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 631 | |
0da974f4 | 632 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
1da177e4 LT |
633 | if (n == NULL) |
634 | return -ENOBUFS; | |
635 | ||
1da177e4 | 636 | #ifdef CONFIG_CLS_U32_PERF |
0da974f4 | 637 | n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL); |
1da177e4 LT |
638 | if (n->pf == NULL) { |
639 | kfree(n); | |
640 | return -ENOBUFS; | |
641 | } | |
1da177e4 LT |
642 | #endif |
643 | ||
644 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
645 | n->ht_up = ht; | |
646 | n->handle = handle; | |
b2268016 | 647 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
1da177e4 LT |
648 | |
649 | #ifdef CONFIG_CLS_U32_MARK | |
add93b61 | 650 | if (tb[TCA_U32_MARK]) { |
1da177e4 LT |
651 | struct tc_u32_mark *mark; |
652 | ||
add93b61 | 653 | mark = nla_data(tb[TCA_U32_MARK]); |
1da177e4 LT |
654 | memcpy(&n->mark, mark, sizeof(struct tc_u32_mark)); |
655 | n->mark.success = 0; | |
656 | } | |
657 | #endif | |
658 | ||
add93b61 | 659 | err = u32_set_parms(tp, base, ht, n, tb, tca[TCA_RATE]); |
1da177e4 LT |
660 | if (err == 0) { |
661 | struct tc_u_knode **ins; | |
662 | for (ins = &ht->ht[TC_U32_HASH(handle)]; *ins; ins = &(*ins)->next) | |
663 | if (TC_U32_NODE(handle) < TC_U32_NODE((*ins)->handle)) | |
664 | break; | |
665 | ||
666 | n->next = *ins; | |
6f573214 | 667 | tcf_tree_lock(tp); |
1da177e4 | 668 | *ins = n; |
6f573214 | 669 | tcf_tree_unlock(tp); |
1da177e4 LT |
670 | |
671 | *arg = (unsigned long)n; | |
672 | return 0; | |
673 | } | |
674 | #ifdef CONFIG_CLS_U32_PERF | |
1ae39a43 | 675 | kfree(n->pf); |
1da177e4 LT |
676 | #endif |
677 | kfree(n); | |
678 | return err; | |
679 | } | |
680 | ||
681 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
682 | { | |
683 | struct tc_u_common *tp_c = tp->data; | |
684 | struct tc_u_hnode *ht; | |
685 | struct tc_u_knode *n; | |
686 | unsigned h; | |
687 | ||
688 | if (arg->stop) | |
689 | return; | |
690 | ||
691 | for (ht = tp_c->hlist; ht; ht = ht->next) { | |
692 | if (ht->prio != tp->prio) | |
693 | continue; | |
694 | if (arg->count >= arg->skip) { | |
695 | if (arg->fn(tp, (unsigned long)ht, arg) < 0) { | |
696 | arg->stop = 1; | |
697 | return; | |
698 | } | |
699 | } | |
700 | arg->count++; | |
701 | for (h = 0; h <= ht->divisor; h++) { | |
702 | for (n = ht->ht[h]; n; n = n->next) { | |
703 | if (arg->count < arg->skip) { | |
704 | arg->count++; | |
705 | continue; | |
706 | } | |
707 | if (arg->fn(tp, (unsigned long)n, arg) < 0) { | |
708 | arg->stop = 1; | |
709 | return; | |
710 | } | |
711 | arg->count++; | |
712 | } | |
713 | } | |
714 | } | |
715 | } | |
716 | ||
717 | static int u32_dump(struct tcf_proto *tp, unsigned long fh, | |
718 | struct sk_buff *skb, struct tcmsg *t) | |
719 | { | |
720 | struct tc_u_knode *n = (struct tc_u_knode*)fh; | |
4b3550ef | 721 | struct nlattr *nest; |
1da177e4 LT |
722 | |
723 | if (n == NULL) | |
724 | return skb->len; | |
725 | ||
726 | t->tcm_handle = n->handle; | |
727 | ||
4b3550ef PM |
728 | nest = nla_nest_start(skb, TCA_OPTIONS); |
729 | if (nest == NULL) | |
730 | goto nla_put_failure; | |
1da177e4 LT |
731 | |
732 | if (TC_U32_KEY(n->handle) == 0) { | |
733 | struct tc_u_hnode *ht = (struct tc_u_hnode*)fh; | |
734 | u32 divisor = ht->divisor+1; | |
24beeab5 | 735 | NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor); |
1da177e4 | 736 | } else { |
add93b61 | 737 | NLA_PUT(skb, TCA_U32_SEL, |
1da177e4 LT |
738 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), |
739 | &n->sel); | |
740 | if (n->ht_up) { | |
741 | u32 htid = n->handle & 0xFFFFF000; | |
24beeab5 | 742 | NLA_PUT_U32(skb, TCA_U32_HASH, htid); |
1da177e4 LT |
743 | } |
744 | if (n->res.classid) | |
24beeab5 | 745 | NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid); |
1da177e4 | 746 | if (n->ht_down) |
24beeab5 | 747 | NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle); |
1da177e4 LT |
748 | |
749 | #ifdef CONFIG_CLS_U32_MARK | |
750 | if (n->mark.val || n->mark.mask) | |
add93b61 | 751 | NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark); |
1da177e4 LT |
752 | #endif |
753 | ||
754 | if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0) | |
add93b61 | 755 | goto nla_put_failure; |
1da177e4 LT |
756 | |
757 | #ifdef CONFIG_NET_CLS_IND | |
758 | if(strlen(n->indev)) | |
57e1c487 | 759 | NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev); |
1da177e4 LT |
760 | #endif |
761 | #ifdef CONFIG_CLS_U32_PERF | |
add93b61 | 762 | NLA_PUT(skb, TCA_U32_PCNT, |
1da177e4 LT |
763 | sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64), |
764 | n->pf); | |
765 | #endif | |
766 | } | |
767 | ||
4b3550ef PM |
768 | nla_nest_end(skb, nest); |
769 | ||
1da177e4 LT |
770 | if (TC_U32_KEY(n->handle)) |
771 | if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0) | |
add93b61 | 772 | goto nla_put_failure; |
1da177e4 LT |
773 | return skb->len; |
774 | ||
add93b61 | 775 | nla_put_failure: |
4b3550ef | 776 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
777 | return -1; |
778 | } | |
779 | ||
2eb9d75c | 780 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
781 | .kind = "u32", |
782 | .classify = u32_classify, | |
783 | .init = u32_init, | |
784 | .destroy = u32_destroy, | |
785 | .get = u32_get, | |
786 | .put = u32_put, | |
787 | .change = u32_change, | |
788 | .delete = u32_delete, | |
789 | .walk = u32_walk, | |
790 | .dump = u32_dump, | |
791 | .owner = THIS_MODULE, | |
792 | }; | |
793 | ||
794 | static int __init init_u32(void) | |
795 | { | |
6ff9c364 | 796 | pr_info("u32 classifier\n"); |
1da177e4 | 797 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 798 | pr_info(" Performance counters on\n"); |
1da177e4 | 799 | #endif |
1da177e4 | 800 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 801 | pr_info(" input device check on\n"); |
1da177e4 LT |
802 | #endif |
803 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 804 | pr_info(" Actions configured\n"); |
1da177e4 LT |
805 | #endif |
806 | return register_tcf_proto_ops(&cls_u32_ops); | |
807 | } | |
808 | ||
10297b99 | 809 | static void __exit exit_u32(void) |
1da177e4 LT |
810 | { |
811 | unregister_tcf_proto_ops(&cls_u32_ops); | |
812 | } | |
813 | ||
814 | module_init(init_u32) | |
815 | module_exit(exit_u32) | |
816 | MODULE_LICENSE("GPL"); |