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 | |
2519a602 | 51 | int ifindex; |
1da177e4 LT |
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 | ||
cc7ec456 ED |
82 | static inline unsigned int u32_hash_fold(__be32 key, |
83 | const struct tc_u32_sel *sel, | |
84 | u8 fshift) | |
1da177e4 | 85 | { |
cc7ec456 | 86 | unsigned int h = ntohl(key & sel->hmask) >> fshift; |
1da177e4 LT |
87 | |
88 | return h; | |
89 | } | |
90 | ||
dc7f9f6e | 91 | static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res) |
1da177e4 LT |
92 | { |
93 | struct { | |
94 | struct tc_u_knode *knode; | |
fbc2e7d9 | 95 | unsigned int off; |
1da177e4 LT |
96 | } stack[TC_U32_MAXDEPTH]; |
97 | ||
cc7ec456 | 98 | struct tc_u_hnode *ht = (struct tc_u_hnode *)tp->root; |
fbc2e7d9 | 99 | unsigned int off = skb_network_offset(skb); |
1da177e4 LT |
100 | struct tc_u_knode *n; |
101 | int sdepth = 0; | |
102 | int off2 = 0; | |
103 | int sel = 0; | |
104 | #ifdef CONFIG_CLS_U32_PERF | |
105 | int j; | |
106 | #endif | |
107 | int i, r; | |
108 | ||
109 | next_ht: | |
110 | n = ht->ht[sel]; | |
111 | ||
112 | next_knode: | |
113 | if (n) { | |
114 | struct tc_u32_key *key = n->sel.keys; | |
115 | ||
116 | #ifdef CONFIG_CLS_U32_PERF | |
cc7ec456 | 117 | n->pf->rcnt += 1; |
1da177e4 LT |
118 | j = 0; |
119 | #endif | |
120 | ||
121 | #ifdef CONFIG_CLS_U32_MARK | |
82e91ffe | 122 | if ((skb->mark & n->mark.mask) != n->mark.val) { |
1da177e4 LT |
123 | n = n->next; |
124 | goto next_knode; | |
125 | } else { | |
126 | n->mark.success++; | |
127 | } | |
128 | #endif | |
129 | ||
cc7ec456 | 130 | for (i = n->sel.nkeys; i > 0; i--, key++) { |
66d50d25 | 131 | int toff = off + key->off + (off2 & key->offmask); |
86fce3ba | 132 | __be32 *data, hdata; |
fbc2e7d9 | 133 | |
4e18b3ed | 134 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 135 | goto out; |
136 | ||
86fce3ba | 137 | data = skb_header_pointer(skb, toff, 4, &hdata); |
fbc2e7d9 CG |
138 | if (!data) |
139 | goto out; | |
140 | if ((*data ^ key->val) & key->mask) { | |
1da177e4 LT |
141 | n = n->next; |
142 | goto next_knode; | |
143 | } | |
144 | #ifdef CONFIG_CLS_U32_PERF | |
cc7ec456 | 145 | n->pf->kcnts[j] += 1; |
1da177e4 LT |
146 | j++; |
147 | #endif | |
148 | } | |
149 | if (n->ht_down == NULL) { | |
150 | check_terminal: | |
cc7ec456 | 151 | if (n->sel.flags & TC_U32_TERMINAL) { |
1da177e4 LT |
152 | |
153 | *res = n->res; | |
154 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 155 | if (!tcf_match_indev(skb, n->ifindex)) { |
1da177e4 LT |
156 | n = n->next; |
157 | goto next_knode; | |
158 | } | |
159 | #endif | |
160 | #ifdef CONFIG_CLS_U32_PERF | |
cc7ec456 | 161 | n->pf->rhit += 1; |
1da177e4 LT |
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; | |
fbc2e7d9 | 179 | stack[sdepth].off = off; |
1da177e4 LT |
180 | sdepth++; |
181 | ||
182 | ht = n->ht_down; | |
183 | sel = 0; | |
fbc2e7d9 | 184 | if (ht->divisor) { |
86fce3ba | 185 | __be32 *data, hdata; |
fbc2e7d9 CG |
186 | |
187 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
86fce3ba | 188 | &hdata); |
fbc2e7d9 CG |
189 | if (!data) |
190 | goto out; | |
191 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
192 | n->fshift); | |
193 | } | |
cc7ec456 | 194 | if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) |
1da177e4 LT |
195 | goto next_ht; |
196 | ||
cc7ec456 | 197 | if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { |
1da177e4 | 198 | off2 = n->sel.off + 3; |
fbc2e7d9 | 199 | if (n->sel.flags & TC_U32_VAROFFSET) { |
86fce3ba | 200 | __be16 *data, hdata; |
fbc2e7d9 CG |
201 | |
202 | data = skb_header_pointer(skb, | |
203 | off + n->sel.offoff, | |
86fce3ba | 204 | 2, &hdata); |
fbc2e7d9 CG |
205 | if (!data) |
206 | goto out; | |
207 | off2 += ntohs(n->sel.offmask & *data) >> | |
208 | n->sel.offshift; | |
209 | } | |
1da177e4 LT |
210 | off2 &= ~3; |
211 | } | |
cc7ec456 | 212 | if (n->sel.flags & TC_U32_EAT) { |
fbc2e7d9 | 213 | off += off2; |
1da177e4 LT |
214 | off2 = 0; |
215 | } | |
216 | ||
fbc2e7d9 | 217 | if (off < skb->len) |
1da177e4 LT |
218 | goto next_ht; |
219 | } | |
220 | ||
221 | /* POP */ | |
222 | if (sdepth--) { | |
223 | n = stack[sdepth].knode; | |
224 | ht = n->ht_up; | |
fbc2e7d9 | 225 | off = stack[sdepth].off; |
1da177e4 LT |
226 | goto check_terminal; |
227 | } | |
fbc2e7d9 | 228 | out: |
1da177e4 LT |
229 | return -1; |
230 | ||
231 | deadloop: | |
e87cc472 | 232 | net_warn_ratelimited("cls_u32: dead loop\n"); |
1da177e4 LT |
233 | return -1; |
234 | } | |
235 | ||
cc7ec456 | 236 | static struct tc_u_hnode * |
1da177e4 LT |
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 | ||
cc7ec456 | 248 | static struct tc_u_knode * |
1da177e4 LT |
249 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) |
250 | { | |
cc7ec456 | 251 | unsigned int sel; |
1da177e4 LT |
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; | |
cc7ec456 | 296 | } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); |
1da177e4 LT |
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 | ||
72b25a91 | 306 | tp_c = tp->q->u32_node; |
1da177e4 | 307 | |
0da974f4 | 308 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
309 | if (root_ht == NULL) |
310 | return -ENOBUFS; | |
311 | ||
1da177e4 LT |
312 | root_ht->divisor = 0; |
313 | root_ht->refcnt++; | |
314 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
315 | root_ht->prio = tp->prio; | |
316 | ||
317 | if (tp_c == NULL) { | |
0da974f4 | 318 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
319 | if (tp_c == NULL) { |
320 | kfree(root_ht); | |
321 | return -ENOBUFS; | |
322 | } | |
1da177e4 | 323 | tp_c->q = tp->q; |
72b25a91 | 324 | tp->q->u32_node = tp_c; |
1da177e4 LT |
325 | } |
326 | ||
327 | tp_c->refcnt++; | |
328 | root_ht->next = tp_c->hlist; | |
329 | tp_c->hlist = root_ht; | |
330 | root_ht->tp_c = tp_c; | |
331 | ||
332 | tp->root = root_ht; | |
333 | tp->data = tp_c; | |
334 | return 0; | |
335 | } | |
336 | ||
337 | static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n) | |
338 | { | |
339 | tcf_unbind_filter(tp, &n->res); | |
340 | tcf_exts_destroy(tp, &n->exts); | |
341 | if (n->ht_down) | |
342 | n->ht_down->refcnt--; | |
343 | #ifdef CONFIG_CLS_U32_PERF | |
1ae39a43 | 344 | kfree(n->pf); |
1da177e4 LT |
345 | #endif |
346 | kfree(n); | |
347 | return 0; | |
348 | } | |
349 | ||
82d567c2 | 350 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) |
1da177e4 LT |
351 | { |
352 | struct tc_u_knode **kp; | |
353 | struct tc_u_hnode *ht = key->ht_up; | |
354 | ||
355 | if (ht) { | |
356 | for (kp = &ht->ht[TC_U32_HASH(key->handle)]; *kp; kp = &(*kp)->next) { | |
357 | if (*kp == key) { | |
358 | tcf_tree_lock(tp); | |
359 | *kp = key->next; | |
360 | tcf_tree_unlock(tp); | |
361 | ||
362 | u32_destroy_key(tp, key); | |
363 | return 0; | |
364 | } | |
365 | } | |
366 | } | |
547b792c | 367 | WARN_ON(1); |
1da177e4 LT |
368 | return 0; |
369 | } | |
370 | ||
371 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
372 | { | |
373 | struct tc_u_knode *n; | |
cc7ec456 | 374 | unsigned int h; |
1da177e4 | 375 | |
cc7ec456 | 376 | for (h = 0; h <= ht->divisor; h++) { |
1da177e4 LT |
377 | while ((n = ht->ht[h]) != NULL) { |
378 | ht->ht[h] = n->next; | |
379 | ||
380 | u32_destroy_key(tp, n); | |
381 | } | |
382 | } | |
383 | } | |
384 | ||
385 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
386 | { | |
387 | struct tc_u_common *tp_c = tp->data; | |
388 | struct tc_u_hnode **hn; | |
389 | ||
547b792c | 390 | WARN_ON(ht->refcnt); |
1da177e4 LT |
391 | |
392 | u32_clear_hnode(tp, ht); | |
393 | ||
394 | for (hn = &tp_c->hlist; *hn; hn = &(*hn)->next) { | |
395 | if (*hn == ht) { | |
396 | *hn = ht->next; | |
397 | kfree(ht); | |
398 | return 0; | |
399 | } | |
400 | } | |
401 | ||
547b792c | 402 | WARN_ON(1); |
1da177e4 LT |
403 | return -ENOENT; |
404 | } | |
405 | ||
406 | static void u32_destroy(struct tcf_proto *tp) | |
407 | { | |
408 | struct tc_u_common *tp_c = tp->data; | |
47a1a1d4 | 409 | struct tc_u_hnode *root_ht = tp->root; |
1da177e4 | 410 | |
547b792c | 411 | WARN_ON(root_ht == NULL); |
1da177e4 LT |
412 | |
413 | if (root_ht && --root_ht->refcnt == 0) | |
414 | u32_destroy_hnode(tp, root_ht); | |
415 | ||
416 | if (--tp_c->refcnt == 0) { | |
417 | struct tc_u_hnode *ht; | |
1da177e4 | 418 | |
72b25a91 | 419 | tp->q->u32_node = NULL; |
1da177e4 | 420 | |
e56cfad1 JP |
421 | for (ht = tp_c->hlist; ht; ht = ht->next) { |
422 | ht->refcnt--; | |
1da177e4 | 423 | u32_clear_hnode(tp, ht); |
e56cfad1 | 424 | } |
1da177e4 LT |
425 | |
426 | while ((ht = tp_c->hlist) != NULL) { | |
427 | tp_c->hlist = ht->next; | |
428 | ||
547b792c | 429 | WARN_ON(ht->refcnt != 0); |
1da177e4 LT |
430 | |
431 | kfree(ht); | |
3ff50b79 | 432 | } |
1da177e4 LT |
433 | |
434 | kfree(tp_c); | |
435 | } | |
436 | ||
437 | tp->data = NULL; | |
438 | } | |
439 | ||
440 | static int u32_delete(struct tcf_proto *tp, unsigned long arg) | |
441 | { | |
cc7ec456 | 442 | struct tc_u_hnode *ht = (struct tc_u_hnode *)arg; |
1da177e4 LT |
443 | |
444 | if (ht == NULL) | |
445 | return 0; | |
446 | ||
447 | if (TC_U32_KEY(ht->handle)) | |
cc7ec456 | 448 | return u32_delete_key(tp, (struct tc_u_knode *)ht); |
1da177e4 LT |
449 | |
450 | if (tp->root == ht) | |
451 | return -EINVAL; | |
452 | ||
e56cfad1 JP |
453 | if (ht->refcnt == 1) { |
454 | ht->refcnt--; | |
1da177e4 | 455 | u32_destroy_hnode(tp, ht); |
e56cfad1 JP |
456 | } else { |
457 | return -EBUSY; | |
458 | } | |
1da177e4 LT |
459 | |
460 | return 0; | |
461 | } | |
462 | ||
463 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) | |
464 | { | |
465 | struct tc_u_knode *n; | |
cc7ec456 | 466 | unsigned int i = 0x7FF; |
1da177e4 | 467 | |
cc7ec456 | 468 | for (n = ht->ht[TC_U32_HASH(handle)]; n; n = n->next) |
1da177e4 LT |
469 | if (i < TC_U32_NODE(n->handle)) |
470 | i = TC_U32_NODE(n->handle); | |
471 | i++; | |
472 | ||
cc7ec456 | 473 | return handle | (i > 0xFFF ? 0xFFF : i); |
1da177e4 LT |
474 | } |
475 | ||
6fa8c014 PM |
476 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
477 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
478 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
479 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
480 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
481 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
482 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
483 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
484 | }; | |
485 | ||
c1b52739 BL |
486 | static int u32_set_parms(struct net *net, struct tcf_proto *tp, |
487 | unsigned long base, struct tc_u_hnode *ht, | |
add93b61 PM |
488 | struct tc_u_knode *n, struct nlattr **tb, |
489 | struct nlattr *est) | |
1da177e4 LT |
490 | { |
491 | int err; | |
492 | struct tcf_exts e; | |
493 | ||
5da57f42 WC |
494 | tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE); |
495 | err = tcf_exts_validate(net, tp, tb, est, &e); | |
1da177e4 LT |
496 | if (err < 0) |
497 | return err; | |
498 | ||
499 | err = -EINVAL; | |
add93b61 | 500 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 501 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 502 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 LT |
503 | |
504 | if (TC_U32_KEY(handle)) | |
505 | goto errout; | |
506 | ||
507 | if (handle) { | |
508 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
509 | ||
510 | if (ht_down == NULL) | |
511 | goto errout; | |
512 | ht_down->refcnt++; | |
513 | } | |
514 | ||
515 | tcf_tree_lock(tp); | |
47a1a1d4 PM |
516 | ht_old = n->ht_down; |
517 | n->ht_down = ht_down; | |
1da177e4 LT |
518 | tcf_tree_unlock(tp); |
519 | ||
47a1a1d4 PM |
520 | if (ht_old) |
521 | ht_old->refcnt--; | |
1da177e4 | 522 | } |
add93b61 | 523 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 524 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
525 | tcf_bind_filter(tp, &n->res, base); |
526 | } | |
527 | ||
528 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 529 | if (tb[TCA_U32_INDEV]) { |
2519a602 WC |
530 | int ret; |
531 | ret = tcf_change_indev(net, tb[TCA_U32_INDEV]); | |
532 | if (ret < 0) | |
1da177e4 | 533 | goto errout; |
2519a602 | 534 | n->ifindex = ret; |
1da177e4 LT |
535 | } |
536 | #endif | |
537 | tcf_exts_change(tp, &n->exts, &e); | |
538 | ||
539 | return 0; | |
540 | errout: | |
541 | tcf_exts_destroy(tp, &e); | |
542 | return err; | |
543 | } | |
544 | ||
c1b52739 | 545 | static int u32_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 546 | struct tcf_proto *tp, unsigned long base, u32 handle, |
add93b61 | 547 | struct nlattr **tca, |
1da177e4 LT |
548 | unsigned long *arg) |
549 | { | |
550 | struct tc_u_common *tp_c = tp->data; | |
551 | struct tc_u_hnode *ht; | |
552 | struct tc_u_knode *n; | |
553 | struct tc_u32_sel *s; | |
add93b61 PM |
554 | struct nlattr *opt = tca[TCA_OPTIONS]; |
555 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
1da177e4 LT |
556 | u32 htid; |
557 | int err; | |
558 | ||
559 | if (opt == NULL) | |
560 | return handle ? -EINVAL : 0; | |
561 | ||
6fa8c014 | 562 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy); |
cee63723 PM |
563 | if (err < 0) |
564 | return err; | |
1da177e4 | 565 | |
cc7ec456 ED |
566 | n = (struct tc_u_knode *)*arg; |
567 | if (n) { | |
1da177e4 LT |
568 | if (TC_U32_KEY(n->handle) == 0) |
569 | return -EINVAL; | |
570 | ||
c1b52739 BL |
571 | return u32_set_parms(net, tp, base, n->ht_up, n, tb, |
572 | tca[TCA_RATE]); | |
1da177e4 LT |
573 | } |
574 | ||
add93b61 | 575 | if (tb[TCA_U32_DIVISOR]) { |
cc7ec456 | 576 | unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); |
1da177e4 LT |
577 | |
578 | if (--divisor > 0x100) | |
579 | return -EINVAL; | |
580 | if (TC_U32_KEY(handle)) | |
581 | return -EINVAL; | |
582 | if (handle == 0) { | |
583 | handle = gen_new_htid(tp->data); | |
584 | if (handle == 0) | |
585 | return -ENOMEM; | |
586 | } | |
cc7ec456 | 587 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); |
1da177e4 LT |
588 | if (ht == NULL) |
589 | return -ENOBUFS; | |
1da177e4 | 590 | ht->tp_c = tp_c; |
e56cfad1 | 591 | ht->refcnt = 1; |
1da177e4 LT |
592 | ht->divisor = divisor; |
593 | ht->handle = handle; | |
594 | ht->prio = tp->prio; | |
595 | ht->next = tp_c->hlist; | |
596 | tp_c->hlist = ht; | |
597 | *arg = (unsigned long)ht; | |
598 | return 0; | |
599 | } | |
600 | ||
add93b61 | 601 | if (tb[TCA_U32_HASH]) { |
1587bac4 | 602 | htid = nla_get_u32(tb[TCA_U32_HASH]); |
1da177e4 LT |
603 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
604 | ht = tp->root; | |
605 | htid = ht->handle; | |
606 | } else { | |
607 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
608 | if (ht == NULL) | |
609 | return -EINVAL; | |
610 | } | |
611 | } else { | |
612 | ht = tp->root; | |
613 | htid = ht->handle; | |
614 | } | |
615 | ||
616 | if (ht->divisor < TC_U32_HASH(htid)) | |
617 | return -EINVAL; | |
618 | ||
619 | if (handle) { | |
620 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
621 | return -EINVAL; | |
622 | handle = htid | TC_U32_NODE(handle); | |
623 | } else | |
624 | handle = gen_new_kid(ht, htid); | |
625 | ||
6fa8c014 | 626 | if (tb[TCA_U32_SEL] == NULL) |
1da177e4 LT |
627 | return -EINVAL; |
628 | ||
add93b61 | 629 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 630 | |
0da974f4 | 631 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
1da177e4 LT |
632 | if (n == NULL) |
633 | return -ENOBUFS; | |
634 | ||
1da177e4 | 635 | #ifdef CONFIG_CLS_U32_PERF |
0da974f4 | 636 | n->pf = kzalloc(sizeof(struct tc_u32_pcnt) + s->nkeys*sizeof(u64), GFP_KERNEL); |
1da177e4 LT |
637 | if (n->pf == NULL) { |
638 | kfree(n); | |
639 | return -ENOBUFS; | |
640 | } | |
1da177e4 LT |
641 | #endif |
642 | ||
643 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
644 | n->ht_up = ht; | |
645 | n->handle = handle; | |
b2268016 | 646 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
5da57f42 | 647 | tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE); |
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 | ||
c1b52739 | 659 | err = u32_set_parms(net, 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 | ||
832d1d5b | 717 | static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
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 | ||
1b34ec43 DM |
736 | if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) |
737 | goto nla_put_failure; | |
1da177e4 | 738 | } else { |
1b34ec43 DM |
739 | if (nla_put(skb, TCA_U32_SEL, |
740 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
741 | &n->sel)) | |
742 | goto nla_put_failure; | |
1da177e4 LT |
743 | if (n->ht_up) { |
744 | u32 htid = n->handle & 0xFFFFF000; | |
1b34ec43 DM |
745 | if (nla_put_u32(skb, TCA_U32_HASH, htid)) |
746 | goto nla_put_failure; | |
1da177e4 | 747 | } |
1b34ec43 DM |
748 | if (n->res.classid && |
749 | nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) | |
750 | goto nla_put_failure; | |
751 | if (n->ht_down && | |
752 | nla_put_u32(skb, TCA_U32_LINK, n->ht_down->handle)) | |
753 | goto nla_put_failure; | |
1da177e4 LT |
754 | |
755 | #ifdef CONFIG_CLS_U32_MARK | |
1b34ec43 DM |
756 | if ((n->mark.val || n->mark.mask) && |
757 | nla_put(skb, TCA_U32_MARK, sizeof(n->mark), &n->mark)) | |
758 | goto nla_put_failure; | |
1da177e4 LT |
759 | #endif |
760 | ||
5da57f42 | 761 | if (tcf_exts_dump(skb, &n->exts) < 0) |
add93b61 | 762 | goto nla_put_failure; |
1da177e4 LT |
763 | |
764 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 WC |
765 | if (n->ifindex) { |
766 | struct net_device *dev; | |
767 | dev = __dev_get_by_index(net, n->ifindex); | |
768 | if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) | |
769 | goto nla_put_failure; | |
770 | } | |
1da177e4 LT |
771 | #endif |
772 | #ifdef CONFIG_CLS_U32_PERF | |
1b34ec43 DM |
773 | if (nla_put(skb, TCA_U32_PCNT, |
774 | sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64), | |
775 | n->pf)) | |
776 | goto nla_put_failure; | |
1da177e4 LT |
777 | #endif |
778 | } | |
779 | ||
4b3550ef PM |
780 | nla_nest_end(skb, nest); |
781 | ||
1da177e4 | 782 | if (TC_U32_KEY(n->handle)) |
5da57f42 | 783 | if (tcf_exts_dump_stats(skb, &n->exts) < 0) |
add93b61 | 784 | goto nla_put_failure; |
1da177e4 LT |
785 | return skb->len; |
786 | ||
add93b61 | 787 | nla_put_failure: |
4b3550ef | 788 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
789 | return -1; |
790 | } | |
791 | ||
2eb9d75c | 792 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
793 | .kind = "u32", |
794 | .classify = u32_classify, | |
795 | .init = u32_init, | |
796 | .destroy = u32_destroy, | |
797 | .get = u32_get, | |
798 | .put = u32_put, | |
799 | .change = u32_change, | |
800 | .delete = u32_delete, | |
801 | .walk = u32_walk, | |
802 | .dump = u32_dump, | |
803 | .owner = THIS_MODULE, | |
804 | }; | |
805 | ||
806 | static int __init init_u32(void) | |
807 | { | |
6ff9c364 | 808 | pr_info("u32 classifier\n"); |
1da177e4 | 809 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 810 | pr_info(" Performance counters on\n"); |
1da177e4 | 811 | #endif |
1da177e4 | 812 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 813 | pr_info(" input device check on\n"); |
1da177e4 LT |
814 | #endif |
815 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 816 | pr_info(" Actions configured\n"); |
1da177e4 LT |
817 | #endif |
818 | return register_tcf_proto_ops(&cls_u32_ops); | |
819 | } | |
820 | ||
10297b99 | 821 | static void __exit exit_u32(void) |
1da177e4 LT |
822 | { |
823 | unregister_tcf_proto_ops(&cls_u32_ops); | |
824 | } | |
825 | ||
826 | module_init(init_u32) | |
827 | module_exit(exit_u32) | |
828 | MODULE_LICENSE("GPL"); |