Commit | Line | Data |
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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 | ||
cc7ec456 | 45 | struct tc_u_knode { |
1da177e4 LT |
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 | ||
cc7ec456 | 65 | struct tc_u_hnode { |
1da177e4 LT |
66 | struct tc_u_hnode *next; |
67 | u32 handle; | |
68 | u32 prio; | |
69 | struct tc_u_common *tp_c; | |
70 | int refcnt; | |
cc7ec456 | 71 | unsigned int divisor; |
1da177e4 LT |
72 | struct tc_u_knode *ht[1]; |
73 | }; | |
74 | ||
cc7ec456 | 75 | struct tc_u_common { |
1da177e4 LT |
76 | struct tc_u_hnode *hlist; |
77 | struct Qdisc *q; | |
78 | int refcnt; | |
79 | u32 hgenerator; | |
80 | }; | |
81 | ||
5239008b | 82 | static const struct tcf_ext_map u32_ext_map = { |
1da177e4 LT |
83 | .action = TCA_U32_ACT, |
84 | .police = TCA_U32_POLICE | |
85 | }; | |
86 | ||
cc7ec456 ED |
87 | static inline unsigned int u32_hash_fold(__be32 key, |
88 | const struct tc_u32_sel *sel, | |
89 | u8 fshift) | |
1da177e4 | 90 | { |
cc7ec456 | 91 | unsigned int h = ntohl(key & sel->hmask) >> fshift; |
1da177e4 LT |
92 | |
93 | return h; | |
94 | } | |
95 | ||
dc7f9f6e | 96 | static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res) |
1da177e4 LT |
97 | { |
98 | struct { | |
99 | struct tc_u_knode *knode; | |
fbc2e7d9 | 100 | unsigned int off; |
1da177e4 LT |
101 | } stack[TC_U32_MAXDEPTH]; |
102 | ||
cc7ec456 | 103 | struct tc_u_hnode *ht = (struct tc_u_hnode *)tp->root; |
fbc2e7d9 | 104 | unsigned int off = skb_network_offset(skb); |
1da177e4 LT |
105 | struct tc_u_knode *n; |
106 | int sdepth = 0; | |
107 | int off2 = 0; | |
108 | int sel = 0; | |
109 | #ifdef CONFIG_CLS_U32_PERF | |
110 | int j; | |
111 | #endif | |
112 | int i, r; | |
113 | ||
114 | next_ht: | |
115 | n = ht->ht[sel]; | |
116 | ||
117 | next_knode: | |
118 | if (n) { | |
119 | struct tc_u32_key *key = n->sel.keys; | |
120 | ||
121 | #ifdef CONFIG_CLS_U32_PERF | |
cc7ec456 | 122 | n->pf->rcnt += 1; |
1da177e4 LT |
123 | j = 0; |
124 | #endif | |
125 | ||
126 | #ifdef CONFIG_CLS_U32_MARK | |
82e91ffe | 127 | if ((skb->mark & n->mark.mask) != n->mark.val) { |
1da177e4 LT |
128 | n = n->next; |
129 | goto next_knode; | |
130 | } else { | |
131 | n->mark.success++; | |
132 | } | |
133 | #endif | |
134 | ||
cc7ec456 | 135 | for (i = n->sel.nkeys; i > 0; i--, key++) { |
66d50d25 | 136 | int toff = off + key->off + (off2 & key->offmask); |
86fce3ba | 137 | __be32 *data, hdata; |
fbc2e7d9 | 138 | |
4e18b3ed | 139 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 140 | goto out; |
141 | ||
86fce3ba | 142 | data = skb_header_pointer(skb, toff, 4, &hdata); |
fbc2e7d9 CG |
143 | if (!data) |
144 | goto out; | |
145 | if ((*data ^ key->val) & key->mask) { | |
1da177e4 LT |
146 | n = n->next; |
147 | goto next_knode; | |
148 | } | |
149 | #ifdef CONFIG_CLS_U32_PERF | |
cc7ec456 | 150 | n->pf->kcnts[j] += 1; |
1da177e4 LT |
151 | j++; |
152 | #endif | |
153 | } | |
154 | if (n->ht_down == NULL) { | |
155 | check_terminal: | |
cc7ec456 | 156 | if (n->sel.flags & TC_U32_TERMINAL) { |
1da177e4 LT |
157 | |
158 | *res = n->res; | |
159 | #ifdef CONFIG_NET_CLS_IND | |
160 | if (!tcf_match_indev(skb, n->indev)) { | |
161 | n = n->next; | |
162 | goto next_knode; | |
163 | } | |
164 | #endif | |
165 | #ifdef CONFIG_CLS_U32_PERF | |
cc7ec456 | 166 | n->pf->rhit += 1; |
1da177e4 LT |
167 | #endif |
168 | r = tcf_exts_exec(skb, &n->exts, res); | |
169 | if (r < 0) { | |
170 | n = n->next; | |
171 | goto next_knode; | |
172 | } | |
173 | ||
174 | return r; | |
175 | } | |
176 | n = n->next; | |
177 | goto next_knode; | |
178 | } | |
179 | ||
180 | /* PUSH */ | |
181 | if (sdepth >= TC_U32_MAXDEPTH) | |
182 | goto deadloop; | |
183 | stack[sdepth].knode = n; | |
fbc2e7d9 | 184 | stack[sdepth].off = off; |
1da177e4 LT |
185 | sdepth++; |
186 | ||
187 | ht = n->ht_down; | |
188 | sel = 0; | |
fbc2e7d9 | 189 | if (ht->divisor) { |
86fce3ba | 190 | __be32 *data, hdata; |
fbc2e7d9 CG |
191 | |
192 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
86fce3ba | 193 | &hdata); |
fbc2e7d9 CG |
194 | if (!data) |
195 | goto out; | |
196 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
197 | n->fshift); | |
198 | } | |
cc7ec456 | 199 | if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) |
1da177e4 LT |
200 | goto next_ht; |
201 | ||
cc7ec456 | 202 | if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { |
1da177e4 | 203 | off2 = n->sel.off + 3; |
fbc2e7d9 | 204 | if (n->sel.flags & TC_U32_VAROFFSET) { |
86fce3ba | 205 | __be16 *data, hdata; |
fbc2e7d9 CG |
206 | |
207 | data = skb_header_pointer(skb, | |
208 | off + n->sel.offoff, | |
86fce3ba | 209 | 2, &hdata); |
fbc2e7d9 CG |
210 | if (!data) |
211 | goto out; | |
212 | off2 += ntohs(n->sel.offmask & *data) >> | |
213 | n->sel.offshift; | |
214 | } | |
1da177e4 LT |
215 | off2 &= ~3; |
216 | } | |
cc7ec456 | 217 | if (n->sel.flags & TC_U32_EAT) { |
fbc2e7d9 | 218 | off += off2; |
1da177e4 LT |
219 | off2 = 0; |
220 | } | |
221 | ||
fbc2e7d9 | 222 | if (off < skb->len) |
1da177e4 LT |
223 | goto next_ht; |
224 | } | |
225 | ||
226 | /* POP */ | |
227 | if (sdepth--) { | |
228 | n = stack[sdepth].knode; | |
229 | ht = n->ht_up; | |
fbc2e7d9 | 230 | off = stack[sdepth].off; |
1da177e4 LT |
231 | goto check_terminal; |
232 | } | |
fbc2e7d9 | 233 | out: |
1da177e4 LT |
234 | return -1; |
235 | ||
236 | deadloop: | |
237 | if (net_ratelimit()) | |
cc7ec456 | 238 | pr_warning("cls_u32: dead loop\n"); |
1da177e4 LT |
239 | return -1; |
240 | } | |
241 | ||
cc7ec456 | 242 | static struct tc_u_hnode * |
1da177e4 LT |
243 | u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) |
244 | { | |
245 | struct tc_u_hnode *ht; | |
246 | ||
247 | for (ht = tp_c->hlist; ht; ht = ht->next) | |
248 | if (ht->handle == handle) | |
249 | break; | |
250 | ||
251 | return ht; | |
252 | } | |
253 | ||
cc7ec456 | 254 | static struct tc_u_knode * |
1da177e4 LT |
255 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) |
256 | { | |
cc7ec456 | 257 | unsigned int sel; |
1da177e4 LT |
258 | struct tc_u_knode *n = NULL; |
259 | ||
260 | sel = TC_U32_HASH(handle); | |
261 | if (sel > ht->divisor) | |
262 | goto out; | |
263 | ||
264 | for (n = ht->ht[sel]; n; n = n->next) | |
265 | if (n->handle == handle) | |
266 | break; | |
267 | out: | |
268 | return n; | |
269 | } | |
270 | ||
271 | ||
272 | static unsigned long u32_get(struct tcf_proto *tp, u32 handle) | |
273 | { | |
274 | struct tc_u_hnode *ht; | |
275 | struct tc_u_common *tp_c = tp->data; | |
276 | ||
277 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
278 | ht = tp->root; | |
279 | else | |
280 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
281 | ||
282 | if (!ht) | |
283 | return 0; | |
284 | ||
285 | if (TC_U32_KEY(handle) == 0) | |
286 | return (unsigned long)ht; | |
287 | ||
288 | return (unsigned long)u32_lookup_key(ht, handle); | |
289 | } | |
290 | ||
291 | static void u32_put(struct tcf_proto *tp, unsigned long f) | |
292 | { | |
293 | } | |
294 | ||
295 | static u32 gen_new_htid(struct tc_u_common *tp_c) | |
296 | { | |
297 | int i = 0x800; | |
298 | ||
299 | do { | |
300 | if (++tp_c->hgenerator == 0x7FF) | |
301 | tp_c->hgenerator = 1; | |
cc7ec456 | 302 | } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); |
1da177e4 LT |
303 | |
304 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
305 | } | |
306 | ||
307 | static int u32_init(struct tcf_proto *tp) | |
308 | { | |
309 | struct tc_u_hnode *root_ht; | |
310 | struct tc_u_common *tp_c; | |
311 | ||
72b25a91 | 312 | tp_c = tp->q->u32_node; |
1da177e4 | 313 | |
0da974f4 | 314 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
315 | if (root_ht == NULL) |
316 | return -ENOBUFS; | |
317 | ||
1da177e4 LT |
318 | root_ht->divisor = 0; |
319 | root_ht->refcnt++; | |
320 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
321 | root_ht->prio = tp->prio; | |
322 | ||
323 | if (tp_c == NULL) { | |
0da974f4 | 324 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
325 | if (tp_c == NULL) { |
326 | kfree(root_ht); | |
327 | return -ENOBUFS; | |
328 | } | |
1da177e4 | 329 | tp_c->q = tp->q; |
72b25a91 | 330 | tp->q->u32_node = tp_c; |
1da177e4 LT |
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 | |
1ae39a43 | 350 | kfree(n->pf); |
1da177e4 LT |
351 | #endif |
352 | kfree(n); | |
353 | return 0; | |
354 | } | |
355 | ||
356 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode* key) | |
357 | { | |
358 | struct tc_u_knode **kp; | |
359 | struct tc_u_hnode *ht = key->ht_up; | |
360 | ||
361 | if (ht) { | |
362 | for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) { | |
363 | if (*kp == key) { | |
364 | tcf_tree_lock(tp); | |
365 | *kp = key->next; | |
366 | tcf_tree_unlock(tp); | |
367 | ||
368 | u32_destroy_key(tp, key); | |
369 | return 0; | |
370 | } | |
371 | } | |
372 | } | |
547b792c | 373 | WARN_ON(1); |
1da177e4 LT |
374 | return 0; |
375 | } | |
376 | ||
377 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
378 | { | |
379 | struct tc_u_knode *n; | |
cc7ec456 | 380 | unsigned int h; |
1da177e4 | 381 | |
cc7ec456 | 382 | for (h = 0; h <= ht->divisor; h++) { |
1da177e4 LT |
383 | while ((n = ht->ht[h]) != NULL) { |
384 | ht->ht[h] = n->next; | |
385 | ||
386 | u32_destroy_key(tp, n); | |
387 | } | |
388 | } | |
389 | } | |
390 | ||
391 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
392 | { | |
393 | struct tc_u_common *tp_c = tp->data; | |
394 | struct tc_u_hnode **hn; | |
395 | ||
547b792c | 396 | WARN_ON(ht->refcnt); |
1da177e4 LT |
397 | |
398 | u32_clear_hnode(tp, ht); | |
399 | ||
400 | for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) { | |
401 | if (*hn == ht) { | |
402 | *hn = ht->next; | |
403 | kfree(ht); | |
404 | return 0; | |
405 | } | |
406 | } | |
407 | ||
547b792c | 408 | WARN_ON(1); |
1da177e4 LT |
409 | return -ENOENT; |
410 | } | |
411 | ||
412 | static void u32_destroy(struct tcf_proto *tp) | |
413 | { | |
414 | struct tc_u_common *tp_c = tp->data; | |
47a1a1d4 | 415 | struct tc_u_hnode *root_ht = tp->root; |
1da177e4 | 416 | |
547b792c | 417 | WARN_ON(root_ht == NULL); |
1da177e4 LT |
418 | |
419 | if (root_ht && --root_ht->refcnt == 0) | |
420 | u32_destroy_hnode(tp, root_ht); | |
421 | ||
422 | if (--tp_c->refcnt == 0) { | |
423 | struct tc_u_hnode *ht; | |
1da177e4 | 424 | |
72b25a91 | 425 | tp->q->u32_node = NULL; |
1da177e4 | 426 | |
e56cfad1 JP |
427 | for (ht = tp_c->hlist; ht; ht = ht->next) { |
428 | ht->refcnt--; | |
1da177e4 | 429 | u32_clear_hnode(tp, ht); |
e56cfad1 | 430 | } |
1da177e4 LT |
431 | |
432 | while ((ht = tp_c->hlist) != NULL) { | |
433 | tp_c->hlist = ht->next; | |
434 | ||
547b792c | 435 | WARN_ON(ht->refcnt != 0); |
1da177e4 LT |
436 | |
437 | kfree(ht); | |
3ff50b79 | 438 | } |
1da177e4 LT |
439 | |
440 | kfree(tp_c); | |
441 | } | |
442 | ||
443 | tp->data = NULL; | |
444 | } | |
445 | ||
446 | static int u32_delete(struct tcf_proto *tp, unsigned long arg) | |
447 | { | |
cc7ec456 | 448 | struct tc_u_hnode *ht = (struct tc_u_hnode *)arg; |
1da177e4 LT |
449 | |
450 | if (ht == NULL) | |
451 | return 0; | |
452 | ||
453 | if (TC_U32_KEY(ht->handle)) | |
cc7ec456 | 454 | return u32_delete_key(tp, (struct tc_u_knode *)ht); |
1da177e4 LT |
455 | |
456 | if (tp->root == ht) | |
457 | return -EINVAL; | |
458 | ||
e56cfad1 JP |
459 | if (ht->refcnt == 1) { |
460 | ht->refcnt--; | |
1da177e4 | 461 | u32_destroy_hnode(tp, ht); |
e56cfad1 JP |
462 | } else { |
463 | return -EBUSY; | |
464 | } | |
1da177e4 LT |
465 | |
466 | return 0; | |
467 | } | |
468 | ||
469 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) | |
470 | { | |
471 | struct tc_u_knode *n; | |
cc7ec456 | 472 | unsigned int i = 0x7FF; |
1da177e4 | 473 | |
cc7ec456 | 474 | for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next) |
1da177e4 LT |
475 | if (i < TC_U32_NODE(n->handle)) |
476 | i = TC_U32_NODE(n->handle); | |
477 | i++; | |
478 | ||
cc7ec456 | 479 | return handle | (i > 0xFFF ? 0xFFF : i); |
1da177e4 LT |
480 | } |
481 | ||
6fa8c014 PM |
482 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
483 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
484 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
485 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
486 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
487 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
488 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
489 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
490 | }; | |
491 | ||
1da177e4 LT |
492 | static int u32_set_parms(struct tcf_proto *tp, unsigned long base, |
493 | struct tc_u_hnode *ht, | |
add93b61 PM |
494 | struct tc_u_knode *n, struct nlattr **tb, |
495 | struct nlattr *est) | |
1da177e4 LT |
496 | { |
497 | int err; | |
498 | struct tcf_exts e; | |
499 | ||
500 | err = tcf_exts_validate(tp, tb, est, &e, &u32_ext_map); | |
501 | if (err < 0) | |
502 | return err; | |
503 | ||
504 | err = -EINVAL; | |
add93b61 | 505 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 506 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 507 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 LT |
508 | |
509 | if (TC_U32_KEY(handle)) | |
510 | goto errout; | |
511 | ||
512 | if (handle) { | |
513 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
514 | ||
515 | if (ht_down == NULL) | |
516 | goto errout; | |
517 | ht_down->refcnt++; | |
518 | } | |
519 | ||
520 | tcf_tree_lock(tp); | |
47a1a1d4 PM |
521 | ht_old = n->ht_down; |
522 | n->ht_down = ht_down; | |
1da177e4 LT |
523 | tcf_tree_unlock(tp); |
524 | ||
47a1a1d4 PM |
525 | if (ht_old) |
526 | ht_old->refcnt--; | |
1da177e4 | 527 | } |
add93b61 | 528 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 529 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
530 | tcf_bind_filter(tp, &n->res, base); |
531 | } | |
532 | ||
533 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 PM |
534 | if (tb[TCA_U32_INDEV]) { |
535 | err = tcf_change_indev(tp, n->indev, tb[TCA_U32_INDEV]); | |
1da177e4 LT |
536 | if (err < 0) |
537 | goto errout; | |
538 | } | |
539 | #endif | |
540 | tcf_exts_change(tp, &n->exts, &e); | |
541 | ||
542 | return 0; | |
543 | errout: | |
544 | tcf_exts_destroy(tp, &e); | |
545 | return err; | |
546 | } | |
547 | ||
548 | static int u32_change(struct tcf_proto *tp, unsigned long base, u32 handle, | |
add93b61 | 549 | struct nlattr **tca, |
1da177e4 LT |
550 | unsigned long *arg) |
551 | { | |
552 | struct tc_u_common *tp_c = tp->data; | |
553 | struct tc_u_hnode *ht; | |
554 | struct tc_u_knode *n; | |
555 | struct tc_u32_sel *s; | |
add93b61 PM |
556 | struct nlattr *opt = tca[TCA_OPTIONS]; |
557 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
1da177e4 LT |
558 | u32 htid; |
559 | int err; | |
560 | ||
561 | if (opt == NULL) | |
562 | return handle ? -EINVAL : 0; | |
563 | ||
6fa8c014 | 564 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy); |
cee63723 PM |
565 | if (err < 0) |
566 | return err; | |
1da177e4 | 567 | |
cc7ec456 ED |
568 | n = (struct tc_u_knode *)*arg; |
569 | if (n) { | |
1da177e4 LT |
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]) { |
cc7ec456 | 577 | unsigned int 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 | } | |
cc7ec456 | 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; | |
cc7ec456 | 686 | unsigned int h; |
1da177e4 LT |
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 | { | |
cc7ec456 | 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) { | |
cc7ec456 ED |
733 | struct tc_u_hnode *ht = (struct tc_u_hnode *)fh; |
734 | u32 divisor = ht->divisor + 1; | |
735 | ||
24beeab5 | 736 | NLA_PUT_U32(skb, TCA_U32_DIVISOR, divisor); |
1da177e4 | 737 | } else { |
add93b61 | 738 | NLA_PUT(skb, TCA_U32_SEL, |
1da177e4 LT |
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; | |
24beeab5 | 743 | NLA_PUT_U32(skb, TCA_U32_HASH, htid); |
1da177e4 LT |
744 | } |
745 | if (n->res.classid) | |
24beeab5 | 746 | NLA_PUT_U32(skb, TCA_U32_CLASSID, n->res.classid); |
1da177e4 | 747 | if (n->ht_down) |
24beeab5 | 748 | NLA_PUT_U32(skb, TCA_U32_LINK, n->ht_down->handle); |
1da177e4 LT |
749 | |
750 | #ifdef CONFIG_CLS_U32_MARK | |
751 | if (n->mark.val || n->mark.mask) | |
add93b61 | 752 | NLA_PUT(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark); |
1da177e4 LT |
753 | #endif |
754 | ||
755 | if (tcf_exts_dump(skb, &n->exts, &u32_ext_map) < 0) | |
add93b61 | 756 | goto nla_put_failure; |
1da177e4 LT |
757 | |
758 | #ifdef CONFIG_NET_CLS_IND | |
cc7ec456 | 759 | if (strlen(n->indev)) |
57e1c487 | 760 | NLA_PUT_STRING(skb, TCA_U32_INDEV, n->indev); |
1da177e4 LT |
761 | #endif |
762 | #ifdef CONFIG_CLS_U32_PERF | |
add93b61 | 763 | NLA_PUT(skb, TCA_U32_PCNT, |
1da177e4 LT |
764 | sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64), |
765 | n->pf); | |
766 | #endif | |
767 | } | |
768 | ||
4b3550ef PM |
769 | nla_nest_end(skb, nest); |
770 | ||
1da177e4 LT |
771 | if (TC_U32_KEY(n->handle)) |
772 | if (tcf_exts_dump_stats(skb, &n->exts, &u32_ext_map) < 0) | |
add93b61 | 773 | goto nla_put_failure; |
1da177e4 LT |
774 | return skb->len; |
775 | ||
add93b61 | 776 | nla_put_failure: |
4b3550ef | 777 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
778 | return -1; |
779 | } | |
780 | ||
2eb9d75c | 781 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
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 | { | |
6ff9c364 | 797 | pr_info("u32 classifier\n"); |
1da177e4 | 798 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 799 | pr_info(" Performance counters on\n"); |
1da177e4 | 800 | #endif |
1da177e4 | 801 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 802 | pr_info(" input device check on\n"); |
1da177e4 LT |
803 | #endif |
804 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 805 | pr_info(" Actions configured\n"); |
1da177e4 LT |
806 | #endif |
807 | return register_tcf_proto_ops(&cls_u32_ops); | |
808 | } | |
809 | ||
10297b99 | 810 | static void __exit exit_u32(void) |
1da177e4 LT |
811 | { |
812 | unregister_tcf_proto_ops(&cls_u32_ops); | |
813 | } | |
814 | ||
815 | module_init(init_u32) | |
816 | module_exit(exit_u32) | |
817 | MODULE_LICENSE("GPL"); |