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> |
1ce87720 | 39 | #include <linux/percpu.h> |
1da177e4 | 40 | #include <linux/rtnetlink.h> |
1da177e4 | 41 | #include <linux/skbuff.h> |
7801db8a | 42 | #include <linux/bitmap.h> |
0ba48053 | 43 | #include <net/netlink.h> |
1da177e4 LT |
44 | #include <net/act_api.h> |
45 | #include <net/pkt_cls.h> | |
46 | ||
cc7ec456 | 47 | struct tc_u_knode { |
1ce87720 | 48 | struct tc_u_knode __rcu *next; |
1da177e4 | 49 | u32 handle; |
1ce87720 | 50 | struct tc_u_hnode __rcu *ht_up; |
1da177e4 LT |
51 | struct tcf_exts exts; |
52 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 53 | int ifindex; |
1da177e4 LT |
54 | #endif |
55 | u8 fshift; | |
56 | struct tcf_result res; | |
1ce87720 | 57 | struct tc_u_hnode __rcu *ht_down; |
1da177e4 | 58 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 | 59 | struct tc_u32_pcnt __percpu *pf; |
1da177e4 LT |
60 | #endif |
61 | #ifdef CONFIG_CLS_U32_MARK | |
459d5f62 JF |
62 | u32 val; |
63 | u32 mask; | |
64 | u32 __percpu *pcpu_success; | |
1da177e4 | 65 | #endif |
1ce87720 | 66 | struct tcf_proto *tp; |
1ce87720 | 67 | struct rcu_head rcu; |
4e2840ee JF |
68 | /* The 'sel' field MUST be the last field in structure to allow for |
69 | * tc_u32_keys allocated at end of structure. | |
70 | */ | |
71 | struct tc_u32_sel sel; | |
1da177e4 LT |
72 | }; |
73 | ||
cc7ec456 | 74 | struct tc_u_hnode { |
1ce87720 | 75 | struct tc_u_hnode __rcu *next; |
1da177e4 LT |
76 | u32 handle; |
77 | u32 prio; | |
78 | struct tc_u_common *tp_c; | |
79 | int refcnt; | |
cc7ec456 | 80 | unsigned int divisor; |
1ce87720 | 81 | struct rcu_head rcu; |
5778d39d WC |
82 | /* The 'ht' field MUST be the last field in structure to allow for |
83 | * more entries allocated at end of structure. | |
84 | */ | |
85 | struct tc_u_knode __rcu *ht[1]; | |
1da177e4 LT |
86 | }; |
87 | ||
cc7ec456 | 88 | struct tc_u_common { |
1ce87720 | 89 | struct tc_u_hnode __rcu *hlist; |
1da177e4 LT |
90 | struct Qdisc *q; |
91 | int refcnt; | |
92 | u32 hgenerator; | |
1ce87720 | 93 | struct rcu_head rcu; |
1da177e4 LT |
94 | }; |
95 | ||
cc7ec456 ED |
96 | static inline unsigned int u32_hash_fold(__be32 key, |
97 | const struct tc_u32_sel *sel, | |
98 | u8 fshift) | |
1da177e4 | 99 | { |
cc7ec456 | 100 | unsigned int h = ntohl(key & sel->hmask) >> fshift; |
1da177e4 LT |
101 | |
102 | return h; | |
103 | } | |
104 | ||
dc7f9f6e | 105 | static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res) |
1da177e4 LT |
106 | { |
107 | struct { | |
108 | struct tc_u_knode *knode; | |
fbc2e7d9 | 109 | unsigned int off; |
1da177e4 LT |
110 | } stack[TC_U32_MAXDEPTH]; |
111 | ||
1ce87720 | 112 | struct tc_u_hnode *ht = rcu_dereference_bh(tp->root); |
fbc2e7d9 | 113 | unsigned int off = skb_network_offset(skb); |
1da177e4 LT |
114 | struct tc_u_knode *n; |
115 | int sdepth = 0; | |
116 | int off2 = 0; | |
117 | int sel = 0; | |
118 | #ifdef CONFIG_CLS_U32_PERF | |
119 | int j; | |
120 | #endif | |
121 | int i, r; | |
122 | ||
123 | next_ht: | |
1ce87720 | 124 | n = rcu_dereference_bh(ht->ht[sel]); |
1da177e4 LT |
125 | |
126 | next_knode: | |
127 | if (n) { | |
128 | struct tc_u32_key *key = n->sel.keys; | |
129 | ||
130 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 131 | __this_cpu_inc(n->pf->rcnt); |
1da177e4 LT |
132 | j = 0; |
133 | #endif | |
134 | ||
135 | #ifdef CONFIG_CLS_U32_MARK | |
459d5f62 | 136 | if ((skb->mark & n->mask) != n->val) { |
1ce87720 | 137 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
138 | goto next_knode; |
139 | } else { | |
459d5f62 | 140 | __this_cpu_inc(*n->pcpu_success); |
1da177e4 LT |
141 | } |
142 | #endif | |
143 | ||
cc7ec456 | 144 | for (i = n->sel.nkeys; i > 0; i--, key++) { |
66d50d25 | 145 | int toff = off + key->off + (off2 & key->offmask); |
86fce3ba | 146 | __be32 *data, hdata; |
fbc2e7d9 | 147 | |
4e18b3ed | 148 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 149 | goto out; |
150 | ||
86fce3ba | 151 | data = skb_header_pointer(skb, toff, 4, &hdata); |
fbc2e7d9 CG |
152 | if (!data) |
153 | goto out; | |
154 | if ((*data ^ key->val) & key->mask) { | |
1ce87720 | 155 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
156 | goto next_knode; |
157 | } | |
158 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 159 | __this_cpu_inc(n->pf->kcnts[j]); |
1da177e4 LT |
160 | j++; |
161 | #endif | |
162 | } | |
1ce87720 JF |
163 | |
164 | ht = rcu_dereference_bh(n->ht_down); | |
165 | if (!ht) { | |
1da177e4 | 166 | check_terminal: |
cc7ec456 | 167 | if (n->sel.flags & TC_U32_TERMINAL) { |
1da177e4 LT |
168 | |
169 | *res = n->res; | |
170 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 171 | if (!tcf_match_indev(skb, n->ifindex)) { |
1ce87720 | 172 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
173 | goto next_knode; |
174 | } | |
175 | #endif | |
176 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 177 | __this_cpu_inc(n->pf->rhit); |
1da177e4 LT |
178 | #endif |
179 | r = tcf_exts_exec(skb, &n->exts, res); | |
180 | if (r < 0) { | |
1ce87720 | 181 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
182 | goto next_knode; |
183 | } | |
184 | ||
185 | return r; | |
186 | } | |
1ce87720 | 187 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
188 | goto next_knode; |
189 | } | |
190 | ||
191 | /* PUSH */ | |
192 | if (sdepth >= TC_U32_MAXDEPTH) | |
193 | goto deadloop; | |
194 | stack[sdepth].knode = n; | |
fbc2e7d9 | 195 | stack[sdepth].off = off; |
1da177e4 LT |
196 | sdepth++; |
197 | ||
1ce87720 | 198 | ht = rcu_dereference_bh(n->ht_down); |
1da177e4 | 199 | sel = 0; |
fbc2e7d9 | 200 | if (ht->divisor) { |
86fce3ba | 201 | __be32 *data, hdata; |
fbc2e7d9 CG |
202 | |
203 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
86fce3ba | 204 | &hdata); |
fbc2e7d9 CG |
205 | if (!data) |
206 | goto out; | |
207 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
208 | n->fshift); | |
209 | } | |
cc7ec456 | 210 | if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) |
1da177e4 LT |
211 | goto next_ht; |
212 | ||
cc7ec456 | 213 | if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { |
1da177e4 | 214 | off2 = n->sel.off + 3; |
fbc2e7d9 | 215 | if (n->sel.flags & TC_U32_VAROFFSET) { |
86fce3ba | 216 | __be16 *data, hdata; |
fbc2e7d9 CG |
217 | |
218 | data = skb_header_pointer(skb, | |
219 | off + n->sel.offoff, | |
86fce3ba | 220 | 2, &hdata); |
fbc2e7d9 CG |
221 | if (!data) |
222 | goto out; | |
223 | off2 += ntohs(n->sel.offmask & *data) >> | |
224 | n->sel.offshift; | |
225 | } | |
1da177e4 LT |
226 | off2 &= ~3; |
227 | } | |
cc7ec456 | 228 | if (n->sel.flags & TC_U32_EAT) { |
fbc2e7d9 | 229 | off += off2; |
1da177e4 LT |
230 | off2 = 0; |
231 | } | |
232 | ||
fbc2e7d9 | 233 | if (off < skb->len) |
1da177e4 LT |
234 | goto next_ht; |
235 | } | |
236 | ||
237 | /* POP */ | |
238 | if (sdepth--) { | |
239 | n = stack[sdepth].knode; | |
1ce87720 | 240 | ht = rcu_dereference_bh(n->ht_up); |
fbc2e7d9 | 241 | off = stack[sdepth].off; |
1da177e4 LT |
242 | goto check_terminal; |
243 | } | |
fbc2e7d9 | 244 | out: |
1da177e4 LT |
245 | return -1; |
246 | ||
247 | deadloop: | |
e87cc472 | 248 | net_warn_ratelimited("cls_u32: dead loop\n"); |
1da177e4 LT |
249 | return -1; |
250 | } | |
251 | ||
cc7ec456 | 252 | static struct tc_u_hnode * |
1da177e4 LT |
253 | u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) |
254 | { | |
255 | struct tc_u_hnode *ht; | |
256 | ||
1ce87720 JF |
257 | for (ht = rtnl_dereference(tp_c->hlist); |
258 | ht; | |
259 | ht = rtnl_dereference(ht->next)) | |
1da177e4 LT |
260 | if (ht->handle == handle) |
261 | break; | |
262 | ||
263 | return ht; | |
264 | } | |
265 | ||
cc7ec456 | 266 | static struct tc_u_knode * |
1da177e4 LT |
267 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) |
268 | { | |
cc7ec456 | 269 | unsigned int sel; |
1da177e4 LT |
270 | struct tc_u_knode *n = NULL; |
271 | ||
272 | sel = TC_U32_HASH(handle); | |
273 | if (sel > ht->divisor) | |
274 | goto out; | |
275 | ||
1ce87720 JF |
276 | for (n = rtnl_dereference(ht->ht[sel]); |
277 | n; | |
278 | n = rtnl_dereference(n->next)) | |
1da177e4 LT |
279 | if (n->handle == handle) |
280 | break; | |
281 | out: | |
282 | return n; | |
283 | } | |
284 | ||
285 | ||
286 | static unsigned long u32_get(struct tcf_proto *tp, u32 handle) | |
287 | { | |
288 | struct tc_u_hnode *ht; | |
289 | struct tc_u_common *tp_c = tp->data; | |
290 | ||
291 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
1ce87720 | 292 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
293 | else |
294 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
295 | ||
296 | if (!ht) | |
297 | return 0; | |
298 | ||
299 | if (TC_U32_KEY(handle) == 0) | |
300 | return (unsigned long)ht; | |
301 | ||
302 | return (unsigned long)u32_lookup_key(ht, handle); | |
303 | } | |
304 | ||
1da177e4 LT |
305 | static u32 gen_new_htid(struct tc_u_common *tp_c) |
306 | { | |
307 | int i = 0x800; | |
308 | ||
1ce87720 JF |
309 | /* hgenerator only used inside rtnl lock it is safe to increment |
310 | * without read _copy_ update semantics | |
311 | */ | |
1da177e4 LT |
312 | do { |
313 | if (++tp_c->hgenerator == 0x7FF) | |
314 | tp_c->hgenerator = 1; | |
cc7ec456 | 315 | } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); |
1da177e4 LT |
316 | |
317 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
318 | } | |
319 | ||
320 | static int u32_init(struct tcf_proto *tp) | |
321 | { | |
322 | struct tc_u_hnode *root_ht; | |
323 | struct tc_u_common *tp_c; | |
324 | ||
72b25a91 | 325 | tp_c = tp->q->u32_node; |
1da177e4 | 326 | |
0da974f4 | 327 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
328 | if (root_ht == NULL) |
329 | return -ENOBUFS; | |
330 | ||
1da177e4 LT |
331 | root_ht->divisor = 0; |
332 | root_ht->refcnt++; | |
333 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
334 | root_ht->prio = tp->prio; | |
335 | ||
336 | if (tp_c == NULL) { | |
0da974f4 | 337 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
338 | if (tp_c == NULL) { |
339 | kfree(root_ht); | |
340 | return -ENOBUFS; | |
341 | } | |
1da177e4 | 342 | tp_c->q = tp->q; |
72b25a91 | 343 | tp->q->u32_node = tp_c; |
1da177e4 LT |
344 | } |
345 | ||
346 | tp_c->refcnt++; | |
1ce87720 JF |
347 | RCU_INIT_POINTER(root_ht->next, tp_c->hlist); |
348 | rcu_assign_pointer(tp_c->hlist, root_ht); | |
1da177e4 LT |
349 | root_ht->tp_c = tp_c; |
350 | ||
1ce87720 | 351 | rcu_assign_pointer(tp->root, root_ht); |
1da177e4 LT |
352 | tp->data = tp_c; |
353 | return 0; | |
354 | } | |
355 | ||
de5df632 JF |
356 | static int u32_destroy_key(struct tcf_proto *tp, |
357 | struct tc_u_knode *n, | |
358 | bool free_pf) | |
1da177e4 | 359 | { |
18d0264f | 360 | tcf_exts_destroy(&n->exts); |
1da177e4 LT |
361 | if (n->ht_down) |
362 | n->ht_down->refcnt--; | |
363 | #ifdef CONFIG_CLS_U32_PERF | |
de5df632 JF |
364 | if (free_pf) |
365 | free_percpu(n->pf); | |
a1ddcfee JF |
366 | #endif |
367 | #ifdef CONFIG_CLS_U32_MARK | |
de5df632 JF |
368 | if (free_pf) |
369 | free_percpu(n->pcpu_success); | |
1da177e4 LT |
370 | #endif |
371 | kfree(n); | |
372 | return 0; | |
373 | } | |
374 | ||
de5df632 JF |
375 | /* u32_delete_key_rcu should be called when free'ing a copied |
376 | * version of a tc_u_knode obtained from u32_init_knode(). When | |
377 | * copies are obtained from u32_init_knode() the statistics are | |
378 | * shared between the old and new copies to allow readers to | |
379 | * continue to update the statistics during the copy. To support | |
380 | * this the u32_delete_key_rcu variant does not free the percpu | |
381 | * statistics. | |
382 | */ | |
1ce87720 JF |
383 | static void u32_delete_key_rcu(struct rcu_head *rcu) |
384 | { | |
385 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
386 | ||
de5df632 JF |
387 | u32_destroy_key(key->tp, key, false); |
388 | } | |
389 | ||
390 | /* u32_delete_key_freepf_rcu is the rcu callback variant | |
391 | * that free's the entire structure including the statistics | |
392 | * percpu variables. Only use this if the key is not a copy | |
393 | * returned by u32_init_knode(). See u32_delete_key_rcu() | |
394 | * for the variant that should be used with keys return from | |
395 | * u32_init_knode() | |
396 | */ | |
397 | static void u32_delete_key_freepf_rcu(struct rcu_head *rcu) | |
398 | { | |
399 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
400 | ||
401 | u32_destroy_key(key->tp, key, true); | |
1ce87720 JF |
402 | } |
403 | ||
82d567c2 | 404 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) |
1da177e4 | 405 | { |
1ce87720 JF |
406 | struct tc_u_knode __rcu **kp; |
407 | struct tc_u_knode *pkp; | |
a96366bf | 408 | struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); |
1da177e4 LT |
409 | |
410 | if (ht) { | |
1ce87720 JF |
411 | kp = &ht->ht[TC_U32_HASH(key->handle)]; |
412 | for (pkp = rtnl_dereference(*kp); pkp; | |
413 | kp = &pkp->next, pkp = rtnl_dereference(*kp)) { | |
414 | if (pkp == key) { | |
415 | RCU_INIT_POINTER(*kp, key->next); | |
1da177e4 | 416 | |
a0efb80c | 417 | tcf_unbind_filter(tp, &key->res); |
de5df632 | 418 | call_rcu(&key->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
419 | return 0; |
420 | } | |
421 | } | |
422 | } | |
547b792c | 423 | WARN_ON(1); |
1da177e4 LT |
424 | return 0; |
425 | } | |
426 | ||
a0efb80c | 427 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) |
1da177e4 LT |
428 | { |
429 | struct tc_u_knode *n; | |
cc7ec456 | 430 | unsigned int h; |
1da177e4 | 431 | |
cc7ec456 | 432 | for (h = 0; h <= ht->divisor; h++) { |
1ce87720 JF |
433 | while ((n = rtnl_dereference(ht->ht[h])) != NULL) { |
434 | RCU_INIT_POINTER(ht->ht[h], | |
435 | rtnl_dereference(n->next)); | |
a0efb80c | 436 | tcf_unbind_filter(tp, &n->res); |
de5df632 | 437 | call_rcu(&n->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
438 | } |
439 | } | |
440 | } | |
441 | ||
442 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
443 | { | |
444 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 JF |
445 | struct tc_u_hnode __rcu **hn; |
446 | struct tc_u_hnode *phn; | |
1da177e4 | 447 | |
547b792c | 448 | WARN_ON(ht->refcnt); |
1da177e4 | 449 | |
a0efb80c | 450 | u32_clear_hnode(tp, ht); |
1da177e4 | 451 | |
1ce87720 JF |
452 | hn = &tp_c->hlist; |
453 | for (phn = rtnl_dereference(*hn); | |
454 | phn; | |
455 | hn = &phn->next, phn = rtnl_dereference(*hn)) { | |
456 | if (phn == ht) { | |
457 | RCU_INIT_POINTER(*hn, ht->next); | |
458 | kfree_rcu(ht, rcu); | |
1da177e4 LT |
459 | return 0; |
460 | } | |
461 | } | |
462 | ||
1da177e4 LT |
463 | return -ENOENT; |
464 | } | |
465 | ||
466 | static void u32_destroy(struct tcf_proto *tp) | |
467 | { | |
468 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 | 469 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 | 470 | |
547b792c | 471 | WARN_ON(root_ht == NULL); |
1da177e4 LT |
472 | |
473 | if (root_ht && --root_ht->refcnt == 0) | |
474 | u32_destroy_hnode(tp, root_ht); | |
475 | ||
476 | if (--tp_c->refcnt == 0) { | |
477 | struct tc_u_hnode *ht; | |
1da177e4 | 478 | |
72b25a91 | 479 | tp->q->u32_node = NULL; |
1da177e4 | 480 | |
1ce87720 JF |
481 | for (ht = rtnl_dereference(tp_c->hlist); |
482 | ht; | |
483 | ht = rtnl_dereference(ht->next)) { | |
e56cfad1 | 484 | ht->refcnt--; |
a0efb80c | 485 | u32_clear_hnode(tp, ht); |
e56cfad1 | 486 | } |
1da177e4 | 487 | |
1ce87720 JF |
488 | while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) { |
489 | RCU_INIT_POINTER(tp_c->hlist, ht->next); | |
490 | kfree_rcu(ht, rcu); | |
3ff50b79 | 491 | } |
1da177e4 LT |
492 | |
493 | kfree(tp_c); | |
494 | } | |
495 | ||
496 | tp->data = NULL; | |
497 | } | |
498 | ||
499 | static int u32_delete(struct tcf_proto *tp, unsigned long arg) | |
500 | { | |
cc7ec456 | 501 | struct tc_u_hnode *ht = (struct tc_u_hnode *)arg; |
1ce87720 | 502 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 LT |
503 | |
504 | if (ht == NULL) | |
505 | return 0; | |
506 | ||
507 | if (TC_U32_KEY(ht->handle)) | |
cc7ec456 | 508 | return u32_delete_key(tp, (struct tc_u_knode *)ht); |
1da177e4 | 509 | |
1ce87720 | 510 | if (root_ht == ht) |
1da177e4 LT |
511 | return -EINVAL; |
512 | ||
e56cfad1 JP |
513 | if (ht->refcnt == 1) { |
514 | ht->refcnt--; | |
1da177e4 | 515 | u32_destroy_hnode(tp, ht); |
e56cfad1 JP |
516 | } else { |
517 | return -EBUSY; | |
518 | } | |
1da177e4 LT |
519 | |
520 | return 0; | |
521 | } | |
522 | ||
7801db8a | 523 | #define NR_U32_NODE (1<<12) |
1da177e4 LT |
524 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) |
525 | { | |
526 | struct tc_u_knode *n; | |
7801db8a CW |
527 | unsigned long i; |
528 | unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long), | |
529 | GFP_KERNEL); | |
530 | if (!bitmap) | |
531 | return handle | 0xFFF; | |
1da177e4 | 532 | |
1ce87720 JF |
533 | for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]); |
534 | n; | |
535 | n = rtnl_dereference(n->next)) | |
7801db8a | 536 | set_bit(TC_U32_NODE(n->handle), bitmap); |
1da177e4 | 537 | |
7801db8a CW |
538 | i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800); |
539 | if (i >= NR_U32_NODE) | |
540 | i = find_next_zero_bit(bitmap, NR_U32_NODE, 1); | |
541 | ||
542 | kfree(bitmap); | |
543 | return handle | (i >= NR_U32_NODE ? 0xFFF : i); | |
1da177e4 LT |
544 | } |
545 | ||
6fa8c014 PM |
546 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
547 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
548 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
549 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
550 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
551 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
552 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
553 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
554 | }; | |
555 | ||
c1b52739 BL |
556 | static int u32_set_parms(struct net *net, struct tcf_proto *tp, |
557 | unsigned long base, struct tc_u_hnode *ht, | |
add93b61 | 558 | struct tc_u_knode *n, struct nlattr **tb, |
2f7ef2f8 | 559 | struct nlattr *est, bool ovr) |
1da177e4 LT |
560 | { |
561 | int err; | |
562 | struct tcf_exts e; | |
563 | ||
5da57f42 | 564 | tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE); |
2f7ef2f8 | 565 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
566 | if (err < 0) |
567 | return err; | |
568 | ||
569 | err = -EINVAL; | |
add93b61 | 570 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 571 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 572 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 LT |
573 | |
574 | if (TC_U32_KEY(handle)) | |
575 | goto errout; | |
576 | ||
577 | if (handle) { | |
578 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
579 | ||
580 | if (ht_down == NULL) | |
581 | goto errout; | |
582 | ht_down->refcnt++; | |
583 | } | |
584 | ||
1ce87720 JF |
585 | ht_old = rtnl_dereference(n->ht_down); |
586 | rcu_assign_pointer(n->ht_down, ht_down); | |
1da177e4 | 587 | |
47a1a1d4 PM |
588 | if (ht_old) |
589 | ht_old->refcnt--; | |
1da177e4 | 590 | } |
add93b61 | 591 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 592 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
593 | tcf_bind_filter(tp, &n->res, base); |
594 | } | |
595 | ||
596 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 597 | if (tb[TCA_U32_INDEV]) { |
2519a602 WC |
598 | int ret; |
599 | ret = tcf_change_indev(net, tb[TCA_U32_INDEV]); | |
600 | if (ret < 0) | |
1da177e4 | 601 | goto errout; |
2519a602 | 602 | n->ifindex = ret; |
1da177e4 LT |
603 | } |
604 | #endif | |
605 | tcf_exts_change(tp, &n->exts, &e); | |
606 | ||
607 | return 0; | |
608 | errout: | |
18d0264f | 609 | tcf_exts_destroy(&e); |
1da177e4 LT |
610 | return err; |
611 | } | |
612 | ||
de5df632 JF |
613 | static void u32_replace_knode(struct tcf_proto *tp, |
614 | struct tc_u_common *tp_c, | |
615 | struct tc_u_knode *n) | |
616 | { | |
617 | struct tc_u_knode __rcu **ins; | |
618 | struct tc_u_knode *pins; | |
619 | struct tc_u_hnode *ht; | |
620 | ||
621 | if (TC_U32_HTID(n->handle) == TC_U32_ROOT) | |
622 | ht = rtnl_dereference(tp->root); | |
623 | else | |
624 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle)); | |
625 | ||
626 | ins = &ht->ht[TC_U32_HASH(n->handle)]; | |
627 | ||
628 | /* The node must always exist for it to be replaced if this is not the | |
629 | * case then something went very wrong elsewhere. | |
630 | */ | |
631 | for (pins = rtnl_dereference(*ins); ; | |
632 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
633 | if (pins->handle == n->handle) | |
634 | break; | |
635 | ||
636 | RCU_INIT_POINTER(n->next, pins->next); | |
637 | rcu_assign_pointer(*ins, n); | |
638 | } | |
639 | ||
640 | static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp, | |
641 | struct tc_u_knode *n) | |
642 | { | |
643 | struct tc_u_knode *new; | |
644 | struct tc_u32_sel *s = &n->sel; | |
645 | ||
646 | new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), | |
647 | GFP_KERNEL); | |
648 | ||
649 | if (!new) | |
650 | return NULL; | |
651 | ||
652 | RCU_INIT_POINTER(new->next, n->next); | |
653 | new->handle = n->handle; | |
654 | RCU_INIT_POINTER(new->ht_up, n->ht_up); | |
655 | ||
656 | #ifdef CONFIG_NET_CLS_IND | |
657 | new->ifindex = n->ifindex; | |
658 | #endif | |
659 | new->fshift = n->fshift; | |
660 | new->res = n->res; | |
661 | RCU_INIT_POINTER(new->ht_down, n->ht_down); | |
662 | ||
663 | /* bump reference count as long as we hold pointer to structure */ | |
664 | if (new->ht_down) | |
665 | new->ht_down->refcnt++; | |
666 | ||
667 | #ifdef CONFIG_CLS_U32_PERF | |
668 | /* Statistics may be incremented by readers during update | |
669 | * so we must keep them in tact. When the node is later destroyed | |
670 | * a special destroy call must be made to not free the pf memory. | |
671 | */ | |
672 | new->pf = n->pf; | |
673 | #endif | |
674 | ||
675 | #ifdef CONFIG_CLS_U32_MARK | |
676 | new->val = n->val; | |
677 | new->mask = n->mask; | |
678 | /* Similarly success statistics must be moved as pointers */ | |
679 | new->pcpu_success = n->pcpu_success; | |
680 | #endif | |
681 | new->tp = tp; | |
682 | memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
683 | ||
684 | tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE); | |
685 | ||
686 | return new; | |
687 | } | |
688 | ||
c1b52739 | 689 | static int u32_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 690 | struct tcf_proto *tp, unsigned long base, u32 handle, |
add93b61 | 691 | struct nlattr **tca, |
2f7ef2f8 | 692 | unsigned long *arg, bool ovr) |
1da177e4 LT |
693 | { |
694 | struct tc_u_common *tp_c = tp->data; | |
695 | struct tc_u_hnode *ht; | |
696 | struct tc_u_knode *n; | |
697 | struct tc_u32_sel *s; | |
add93b61 PM |
698 | struct nlattr *opt = tca[TCA_OPTIONS]; |
699 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
1da177e4 LT |
700 | u32 htid; |
701 | int err; | |
459d5f62 JF |
702 | #ifdef CONFIG_CLS_U32_PERF |
703 | size_t size; | |
704 | #endif | |
1da177e4 LT |
705 | |
706 | if (opt == NULL) | |
707 | return handle ? -EINVAL : 0; | |
708 | ||
6fa8c014 | 709 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy); |
cee63723 PM |
710 | if (err < 0) |
711 | return err; | |
1da177e4 | 712 | |
cc7ec456 ED |
713 | n = (struct tc_u_knode *)*arg; |
714 | if (n) { | |
de5df632 JF |
715 | struct tc_u_knode *new; |
716 | ||
1da177e4 LT |
717 | if (TC_U32_KEY(n->handle) == 0) |
718 | return -EINVAL; | |
719 | ||
de5df632 JF |
720 | new = u32_init_knode(tp, n); |
721 | if (!new) | |
722 | return -ENOMEM; | |
723 | ||
724 | err = u32_set_parms(net, tp, base, | |
725 | rtnl_dereference(n->ht_up), new, tb, | |
726 | tca[TCA_RATE], ovr); | |
727 | ||
728 | if (err) { | |
729 | u32_destroy_key(tp, new, false); | |
730 | return err; | |
731 | } | |
732 | ||
733 | u32_replace_knode(tp, tp_c, new); | |
a0efb80c | 734 | tcf_unbind_filter(tp, &n->res); |
de5df632 JF |
735 | call_rcu(&n->rcu, u32_delete_key_rcu); |
736 | return 0; | |
1da177e4 LT |
737 | } |
738 | ||
add93b61 | 739 | if (tb[TCA_U32_DIVISOR]) { |
cc7ec456 | 740 | unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); |
1da177e4 LT |
741 | |
742 | if (--divisor > 0x100) | |
743 | return -EINVAL; | |
744 | if (TC_U32_KEY(handle)) | |
745 | return -EINVAL; | |
746 | if (handle == 0) { | |
747 | handle = gen_new_htid(tp->data); | |
748 | if (handle == 0) | |
749 | return -ENOMEM; | |
750 | } | |
cc7ec456 | 751 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); |
1da177e4 LT |
752 | if (ht == NULL) |
753 | return -ENOBUFS; | |
1da177e4 | 754 | ht->tp_c = tp_c; |
e56cfad1 | 755 | ht->refcnt = 1; |
1da177e4 LT |
756 | ht->divisor = divisor; |
757 | ht->handle = handle; | |
758 | ht->prio = tp->prio; | |
1ce87720 JF |
759 | RCU_INIT_POINTER(ht->next, tp_c->hlist); |
760 | rcu_assign_pointer(tp_c->hlist, ht); | |
1da177e4 LT |
761 | *arg = (unsigned long)ht; |
762 | return 0; | |
763 | } | |
764 | ||
add93b61 | 765 | if (tb[TCA_U32_HASH]) { |
1587bac4 | 766 | htid = nla_get_u32(tb[TCA_U32_HASH]); |
1da177e4 | 767 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
1ce87720 | 768 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
769 | htid = ht->handle; |
770 | } else { | |
771 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
772 | if (ht == NULL) | |
773 | return -EINVAL; | |
774 | } | |
775 | } else { | |
1ce87720 | 776 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
777 | htid = ht->handle; |
778 | } | |
779 | ||
780 | if (ht->divisor < TC_U32_HASH(htid)) | |
781 | return -EINVAL; | |
782 | ||
783 | if (handle) { | |
784 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
785 | return -EINVAL; | |
786 | handle = htid | TC_U32_NODE(handle); | |
787 | } else | |
788 | handle = gen_new_kid(ht, htid); | |
789 | ||
6fa8c014 | 790 | if (tb[TCA_U32_SEL] == NULL) |
1da177e4 LT |
791 | return -EINVAL; |
792 | ||
add93b61 | 793 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 794 | |
0da974f4 | 795 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
1da177e4 LT |
796 | if (n == NULL) |
797 | return -ENOBUFS; | |
798 | ||
1da177e4 | 799 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 JF |
800 | size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64); |
801 | n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt)); | |
802 | if (!n->pf) { | |
1da177e4 LT |
803 | kfree(n); |
804 | return -ENOBUFS; | |
805 | } | |
1da177e4 LT |
806 | #endif |
807 | ||
808 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
a96366bf | 809 | RCU_INIT_POINTER(n->ht_up, ht); |
1da177e4 | 810 | n->handle = handle; |
b2268016 | 811 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
5da57f42 | 812 | tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE); |
1ce87720 | 813 | n->tp = tp; |
1da177e4 LT |
814 | |
815 | #ifdef CONFIG_CLS_U32_MARK | |
459d5f62 | 816 | n->pcpu_success = alloc_percpu(u32); |
a1ddcfee JF |
817 | if (!n->pcpu_success) { |
818 | err = -ENOMEM; | |
819 | goto errout; | |
820 | } | |
459d5f62 | 821 | |
add93b61 | 822 | if (tb[TCA_U32_MARK]) { |
1da177e4 LT |
823 | struct tc_u32_mark *mark; |
824 | ||
add93b61 | 825 | mark = nla_data(tb[TCA_U32_MARK]); |
459d5f62 JF |
826 | n->val = mark->val; |
827 | n->mask = mark->mask; | |
1da177e4 LT |
828 | } |
829 | #endif | |
830 | ||
2f7ef2f8 | 831 | err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr); |
1da177e4 | 832 | if (err == 0) { |
1ce87720 JF |
833 | struct tc_u_knode __rcu **ins; |
834 | struct tc_u_knode *pins; | |
835 | ||
836 | ins = &ht->ht[TC_U32_HASH(handle)]; | |
837 | for (pins = rtnl_dereference(*ins); pins; | |
838 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
839 | if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle)) | |
1da177e4 LT |
840 | break; |
841 | ||
1ce87720 JF |
842 | RCU_INIT_POINTER(n->next, pins); |
843 | rcu_assign_pointer(*ins, n); | |
1da177e4 LT |
844 | |
845 | *arg = (unsigned long)n; | |
846 | return 0; | |
847 | } | |
a1ddcfee JF |
848 | |
849 | #ifdef CONFIG_CLS_U32_MARK | |
850 | free_percpu(n->pcpu_success); | |
a2aeb02a | 851 | errout: |
a1ddcfee JF |
852 | #endif |
853 | ||
1da177e4 | 854 | #ifdef CONFIG_CLS_U32_PERF |
1ce87720 | 855 | free_percpu(n->pf); |
1da177e4 LT |
856 | #endif |
857 | kfree(n); | |
858 | return err; | |
859 | } | |
860 | ||
861 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
862 | { | |
863 | struct tc_u_common *tp_c = tp->data; | |
864 | struct tc_u_hnode *ht; | |
865 | struct tc_u_knode *n; | |
cc7ec456 | 866 | unsigned int h; |
1da177e4 LT |
867 | |
868 | if (arg->stop) | |
869 | return; | |
870 | ||
1ce87720 JF |
871 | for (ht = rtnl_dereference(tp_c->hlist); |
872 | ht; | |
873 | ht = rtnl_dereference(ht->next)) { | |
1da177e4 LT |
874 | if (ht->prio != tp->prio) |
875 | continue; | |
876 | if (arg->count >= arg->skip) { | |
877 | if (arg->fn(tp, (unsigned long)ht, arg) < 0) { | |
878 | arg->stop = 1; | |
879 | return; | |
880 | } | |
881 | } | |
882 | arg->count++; | |
883 | for (h = 0; h <= ht->divisor; h++) { | |
1ce87720 JF |
884 | for (n = rtnl_dereference(ht->ht[h]); |
885 | n; | |
886 | n = rtnl_dereference(n->next)) { | |
1da177e4 LT |
887 | if (arg->count < arg->skip) { |
888 | arg->count++; | |
889 | continue; | |
890 | } | |
891 | if (arg->fn(tp, (unsigned long)n, arg) < 0) { | |
892 | arg->stop = 1; | |
893 | return; | |
894 | } | |
895 | arg->count++; | |
896 | } | |
897 | } | |
898 | } | |
899 | } | |
900 | ||
832d1d5b | 901 | static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
902 | struct sk_buff *skb, struct tcmsg *t) |
903 | { | |
cc7ec456 | 904 | struct tc_u_knode *n = (struct tc_u_knode *)fh; |
1ce87720 | 905 | struct tc_u_hnode *ht_up, *ht_down; |
4b3550ef | 906 | struct nlattr *nest; |
1da177e4 LT |
907 | |
908 | if (n == NULL) | |
909 | return skb->len; | |
910 | ||
911 | t->tcm_handle = n->handle; | |
912 | ||
4b3550ef PM |
913 | nest = nla_nest_start(skb, TCA_OPTIONS); |
914 | if (nest == NULL) | |
915 | goto nla_put_failure; | |
1da177e4 LT |
916 | |
917 | if (TC_U32_KEY(n->handle) == 0) { | |
cc7ec456 ED |
918 | struct tc_u_hnode *ht = (struct tc_u_hnode *)fh; |
919 | u32 divisor = ht->divisor + 1; | |
920 | ||
1b34ec43 DM |
921 | if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) |
922 | goto nla_put_failure; | |
1da177e4 | 923 | } else { |
459d5f62 JF |
924 | #ifdef CONFIG_CLS_U32_PERF |
925 | struct tc_u32_pcnt *gpf; | |
459d5f62 | 926 | int cpu; |
80aab73d | 927 | #endif |
459d5f62 | 928 | |
1b34ec43 DM |
929 | if (nla_put(skb, TCA_U32_SEL, |
930 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
931 | &n->sel)) | |
932 | goto nla_put_failure; | |
1ce87720 JF |
933 | |
934 | ht_up = rtnl_dereference(n->ht_up); | |
935 | if (ht_up) { | |
1da177e4 | 936 | u32 htid = n->handle & 0xFFFFF000; |
1b34ec43 DM |
937 | if (nla_put_u32(skb, TCA_U32_HASH, htid)) |
938 | goto nla_put_failure; | |
1da177e4 | 939 | } |
1b34ec43 DM |
940 | if (n->res.classid && |
941 | nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) | |
942 | goto nla_put_failure; | |
1ce87720 JF |
943 | |
944 | ht_down = rtnl_dereference(n->ht_down); | |
945 | if (ht_down && | |
946 | nla_put_u32(skb, TCA_U32_LINK, ht_down->handle)) | |
1b34ec43 | 947 | goto nla_put_failure; |
1da177e4 LT |
948 | |
949 | #ifdef CONFIG_CLS_U32_MARK | |
459d5f62 JF |
950 | if ((n->val || n->mask)) { |
951 | struct tc_u32_mark mark = {.val = n->val, | |
952 | .mask = n->mask, | |
953 | .success = 0}; | |
80aab73d | 954 | int cpum; |
459d5f62 | 955 | |
80aab73d JF |
956 | for_each_possible_cpu(cpum) { |
957 | __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum); | |
459d5f62 JF |
958 | |
959 | mark.success += cnt; | |
960 | } | |
961 | ||
962 | if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark)) | |
963 | goto nla_put_failure; | |
964 | } | |
1da177e4 LT |
965 | #endif |
966 | ||
5da57f42 | 967 | if (tcf_exts_dump(skb, &n->exts) < 0) |
add93b61 | 968 | goto nla_put_failure; |
1da177e4 LT |
969 | |
970 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 WC |
971 | if (n->ifindex) { |
972 | struct net_device *dev; | |
973 | dev = __dev_get_by_index(net, n->ifindex); | |
974 | if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) | |
975 | goto nla_put_failure; | |
976 | } | |
1da177e4 LT |
977 | #endif |
978 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 JF |
979 | gpf = kzalloc(sizeof(struct tc_u32_pcnt) + |
980 | n->sel.nkeys * sizeof(u64), | |
981 | GFP_KERNEL); | |
982 | if (!gpf) | |
983 | goto nla_put_failure; | |
984 | ||
985 | for_each_possible_cpu(cpu) { | |
986 | int i; | |
987 | struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu); | |
988 | ||
989 | gpf->rcnt += pf->rcnt; | |
990 | gpf->rhit += pf->rhit; | |
991 | for (i = 0; i < n->sel.nkeys; i++) | |
992 | gpf->kcnts[i] += pf->kcnts[i]; | |
993 | } | |
994 | ||
1b34ec43 DM |
995 | if (nla_put(skb, TCA_U32_PCNT, |
996 | sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64), | |
459d5f62 JF |
997 | gpf)) { |
998 | kfree(gpf); | |
1b34ec43 | 999 | goto nla_put_failure; |
459d5f62 JF |
1000 | } |
1001 | kfree(gpf); | |
1da177e4 LT |
1002 | #endif |
1003 | } | |
1004 | ||
4b3550ef PM |
1005 | nla_nest_end(skb, nest); |
1006 | ||
1da177e4 | 1007 | if (TC_U32_KEY(n->handle)) |
5da57f42 | 1008 | if (tcf_exts_dump_stats(skb, &n->exts) < 0) |
add93b61 | 1009 | goto nla_put_failure; |
1da177e4 LT |
1010 | return skb->len; |
1011 | ||
add93b61 | 1012 | nla_put_failure: |
4b3550ef | 1013 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1014 | return -1; |
1015 | } | |
1016 | ||
2eb9d75c | 1017 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
1018 | .kind = "u32", |
1019 | .classify = u32_classify, | |
1020 | .init = u32_init, | |
1021 | .destroy = u32_destroy, | |
1022 | .get = u32_get, | |
1da177e4 LT |
1023 | .change = u32_change, |
1024 | .delete = u32_delete, | |
1025 | .walk = u32_walk, | |
1026 | .dump = u32_dump, | |
1027 | .owner = THIS_MODULE, | |
1028 | }; | |
1029 | ||
1030 | static int __init init_u32(void) | |
1031 | { | |
6ff9c364 | 1032 | pr_info("u32 classifier\n"); |
1da177e4 | 1033 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 1034 | pr_info(" Performance counters on\n"); |
1da177e4 | 1035 | #endif |
1da177e4 | 1036 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 1037 | pr_info(" input device check on\n"); |
1da177e4 LT |
1038 | #endif |
1039 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 1040 | pr_info(" Actions configured\n"); |
1da177e4 LT |
1041 | #endif |
1042 | return register_tcf_proto_ops(&cls_u32_ops); | |
1043 | } | |
1044 | ||
10297b99 | 1045 | static void __exit exit_u32(void) |
1da177e4 LT |
1046 | { |
1047 | unregister_tcf_proto_ops(&cls_u32_ops); | |
1048 | } | |
1049 | ||
1050 | module_init(init_u32) | |
1051 | module_exit(exit_u32) | |
1052 | MODULE_LICENSE("GPL"); |