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> | |
a1b7c5fd | 46 | #include <linux/netdevice.h> |
1da177e4 | 47 | |
cc7ec456 | 48 | struct tc_u_knode { |
1ce87720 | 49 | struct tc_u_knode __rcu *next; |
1da177e4 | 50 | u32 handle; |
1ce87720 | 51 | struct tc_u_hnode __rcu *ht_up; |
1da177e4 LT |
52 | struct tcf_exts exts; |
53 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 54 | int ifindex; |
1da177e4 LT |
55 | #endif |
56 | u8 fshift; | |
57 | struct tcf_result res; | |
1ce87720 | 58 | struct tc_u_hnode __rcu *ht_down; |
1da177e4 | 59 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 | 60 | struct tc_u32_pcnt __percpu *pf; |
1da177e4 | 61 | #endif |
9e8ce79c | 62 | u32 flags; |
1da177e4 | 63 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 JF |
64 | u32 val; |
65 | u32 mask; | |
66 | u32 __percpu *pcpu_success; | |
1da177e4 | 67 | #endif |
1ce87720 | 68 | struct tcf_proto *tp; |
1ce87720 | 69 | struct rcu_head rcu; |
4e2840ee JF |
70 | /* The 'sel' field MUST be the last field in structure to allow for |
71 | * tc_u32_keys allocated at end of structure. | |
72 | */ | |
73 | struct tc_u32_sel sel; | |
1da177e4 LT |
74 | }; |
75 | ||
cc7ec456 | 76 | struct tc_u_hnode { |
1ce87720 | 77 | struct tc_u_hnode __rcu *next; |
1da177e4 LT |
78 | u32 handle; |
79 | u32 prio; | |
80 | struct tc_u_common *tp_c; | |
81 | int refcnt; | |
cc7ec456 | 82 | unsigned int divisor; |
1ce87720 | 83 | struct rcu_head rcu; |
5778d39d WC |
84 | /* The 'ht' field MUST be the last field in structure to allow for |
85 | * more entries allocated at end of structure. | |
86 | */ | |
87 | struct tc_u_knode __rcu *ht[1]; | |
1da177e4 LT |
88 | }; |
89 | ||
cc7ec456 | 90 | struct tc_u_common { |
1ce87720 | 91 | struct tc_u_hnode __rcu *hlist; |
1da177e4 LT |
92 | struct Qdisc *q; |
93 | int refcnt; | |
94 | u32 hgenerator; | |
1ce87720 | 95 | struct rcu_head rcu; |
1da177e4 LT |
96 | }; |
97 | ||
cc7ec456 ED |
98 | static inline unsigned int u32_hash_fold(__be32 key, |
99 | const struct tc_u32_sel *sel, | |
100 | u8 fshift) | |
1da177e4 | 101 | { |
cc7ec456 | 102 | unsigned int h = ntohl(key & sel->hmask) >> fshift; |
1da177e4 LT |
103 | |
104 | return h; | |
105 | } | |
106 | ||
dc7f9f6e | 107 | static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, struct tcf_result *res) |
1da177e4 LT |
108 | { |
109 | struct { | |
110 | struct tc_u_knode *knode; | |
fbc2e7d9 | 111 | unsigned int off; |
1da177e4 LT |
112 | } stack[TC_U32_MAXDEPTH]; |
113 | ||
1ce87720 | 114 | struct tc_u_hnode *ht = rcu_dereference_bh(tp->root); |
fbc2e7d9 | 115 | unsigned int off = skb_network_offset(skb); |
1da177e4 LT |
116 | struct tc_u_knode *n; |
117 | int sdepth = 0; | |
118 | int off2 = 0; | |
119 | int sel = 0; | |
120 | #ifdef CONFIG_CLS_U32_PERF | |
121 | int j; | |
122 | #endif | |
123 | int i, r; | |
124 | ||
125 | next_ht: | |
1ce87720 | 126 | n = rcu_dereference_bh(ht->ht[sel]); |
1da177e4 LT |
127 | |
128 | next_knode: | |
129 | if (n) { | |
130 | struct tc_u32_key *key = n->sel.keys; | |
131 | ||
132 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 133 | __this_cpu_inc(n->pf->rcnt); |
1da177e4 LT |
134 | j = 0; |
135 | #endif | |
136 | ||
137 | #ifdef CONFIG_CLS_U32_MARK | |
459d5f62 | 138 | if ((skb->mark & n->mask) != n->val) { |
1ce87720 | 139 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
140 | goto next_knode; |
141 | } else { | |
459d5f62 | 142 | __this_cpu_inc(*n->pcpu_success); |
1da177e4 LT |
143 | } |
144 | #endif | |
145 | ||
cc7ec456 | 146 | for (i = n->sel.nkeys; i > 0; i--, key++) { |
66d50d25 | 147 | int toff = off + key->off + (off2 & key->offmask); |
86fce3ba | 148 | __be32 *data, hdata; |
fbc2e7d9 | 149 | |
4e18b3ed | 150 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 151 | goto out; |
152 | ||
86fce3ba | 153 | data = skb_header_pointer(skb, toff, 4, &hdata); |
fbc2e7d9 CG |
154 | if (!data) |
155 | goto out; | |
156 | if ((*data ^ key->val) & key->mask) { | |
1ce87720 | 157 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
158 | goto next_knode; |
159 | } | |
160 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 161 | __this_cpu_inc(n->pf->kcnts[j]); |
1da177e4 LT |
162 | j++; |
163 | #endif | |
164 | } | |
1ce87720 JF |
165 | |
166 | ht = rcu_dereference_bh(n->ht_down); | |
167 | if (!ht) { | |
1da177e4 | 168 | check_terminal: |
cc7ec456 | 169 | if (n->sel.flags & TC_U32_TERMINAL) { |
1da177e4 LT |
170 | |
171 | *res = n->res; | |
172 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 173 | if (!tcf_match_indev(skb, n->ifindex)) { |
1ce87720 | 174 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
175 | goto next_knode; |
176 | } | |
177 | #endif | |
178 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 179 | __this_cpu_inc(n->pf->rhit); |
1da177e4 LT |
180 | #endif |
181 | r = tcf_exts_exec(skb, &n->exts, res); | |
182 | if (r < 0) { | |
1ce87720 | 183 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
184 | goto next_knode; |
185 | } | |
186 | ||
187 | return r; | |
188 | } | |
1ce87720 | 189 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
190 | goto next_knode; |
191 | } | |
192 | ||
193 | /* PUSH */ | |
194 | if (sdepth >= TC_U32_MAXDEPTH) | |
195 | goto deadloop; | |
196 | stack[sdepth].knode = n; | |
fbc2e7d9 | 197 | stack[sdepth].off = off; |
1da177e4 LT |
198 | sdepth++; |
199 | ||
1ce87720 | 200 | ht = rcu_dereference_bh(n->ht_down); |
1da177e4 | 201 | sel = 0; |
fbc2e7d9 | 202 | if (ht->divisor) { |
86fce3ba | 203 | __be32 *data, hdata; |
fbc2e7d9 CG |
204 | |
205 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
86fce3ba | 206 | &hdata); |
fbc2e7d9 CG |
207 | if (!data) |
208 | goto out; | |
209 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
210 | n->fshift); | |
211 | } | |
cc7ec456 | 212 | if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) |
1da177e4 LT |
213 | goto next_ht; |
214 | ||
cc7ec456 | 215 | if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { |
1da177e4 | 216 | off2 = n->sel.off + 3; |
fbc2e7d9 | 217 | if (n->sel.flags & TC_U32_VAROFFSET) { |
86fce3ba | 218 | __be16 *data, hdata; |
fbc2e7d9 CG |
219 | |
220 | data = skb_header_pointer(skb, | |
221 | off + n->sel.offoff, | |
86fce3ba | 222 | 2, &hdata); |
fbc2e7d9 CG |
223 | if (!data) |
224 | goto out; | |
225 | off2 += ntohs(n->sel.offmask & *data) >> | |
226 | n->sel.offshift; | |
227 | } | |
1da177e4 LT |
228 | off2 &= ~3; |
229 | } | |
cc7ec456 | 230 | if (n->sel.flags & TC_U32_EAT) { |
fbc2e7d9 | 231 | off += off2; |
1da177e4 LT |
232 | off2 = 0; |
233 | } | |
234 | ||
fbc2e7d9 | 235 | if (off < skb->len) |
1da177e4 LT |
236 | goto next_ht; |
237 | } | |
238 | ||
239 | /* POP */ | |
240 | if (sdepth--) { | |
241 | n = stack[sdepth].knode; | |
1ce87720 | 242 | ht = rcu_dereference_bh(n->ht_up); |
fbc2e7d9 | 243 | off = stack[sdepth].off; |
1da177e4 LT |
244 | goto check_terminal; |
245 | } | |
fbc2e7d9 | 246 | out: |
1da177e4 LT |
247 | return -1; |
248 | ||
249 | deadloop: | |
e87cc472 | 250 | net_warn_ratelimited("cls_u32: dead loop\n"); |
1da177e4 LT |
251 | return -1; |
252 | } | |
253 | ||
cc7ec456 | 254 | static struct tc_u_hnode * |
1da177e4 LT |
255 | u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) |
256 | { | |
257 | struct tc_u_hnode *ht; | |
258 | ||
1ce87720 JF |
259 | for (ht = rtnl_dereference(tp_c->hlist); |
260 | ht; | |
261 | ht = rtnl_dereference(ht->next)) | |
1da177e4 LT |
262 | if (ht->handle == handle) |
263 | break; | |
264 | ||
265 | return ht; | |
266 | } | |
267 | ||
cc7ec456 | 268 | static struct tc_u_knode * |
1da177e4 LT |
269 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) |
270 | { | |
cc7ec456 | 271 | unsigned int sel; |
1da177e4 LT |
272 | struct tc_u_knode *n = NULL; |
273 | ||
274 | sel = TC_U32_HASH(handle); | |
275 | if (sel > ht->divisor) | |
276 | goto out; | |
277 | ||
1ce87720 JF |
278 | for (n = rtnl_dereference(ht->ht[sel]); |
279 | n; | |
280 | n = rtnl_dereference(n->next)) | |
1da177e4 LT |
281 | if (n->handle == handle) |
282 | break; | |
283 | out: | |
284 | return n; | |
285 | } | |
286 | ||
287 | ||
288 | static unsigned long u32_get(struct tcf_proto *tp, u32 handle) | |
289 | { | |
290 | struct tc_u_hnode *ht; | |
291 | struct tc_u_common *tp_c = tp->data; | |
292 | ||
293 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
1ce87720 | 294 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
295 | else |
296 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
297 | ||
298 | if (!ht) | |
299 | return 0; | |
300 | ||
301 | if (TC_U32_KEY(handle) == 0) | |
302 | return (unsigned long)ht; | |
303 | ||
304 | return (unsigned long)u32_lookup_key(ht, handle); | |
305 | } | |
306 | ||
1da177e4 LT |
307 | static u32 gen_new_htid(struct tc_u_common *tp_c) |
308 | { | |
309 | int i = 0x800; | |
310 | ||
1ce87720 JF |
311 | /* hgenerator only used inside rtnl lock it is safe to increment |
312 | * without read _copy_ update semantics | |
313 | */ | |
1da177e4 LT |
314 | do { |
315 | if (++tp_c->hgenerator == 0x7FF) | |
316 | tp_c->hgenerator = 1; | |
cc7ec456 | 317 | } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); |
1da177e4 LT |
318 | |
319 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
320 | } | |
321 | ||
322 | static int u32_init(struct tcf_proto *tp) | |
323 | { | |
324 | struct tc_u_hnode *root_ht; | |
325 | struct tc_u_common *tp_c; | |
326 | ||
72b25a91 | 327 | tp_c = tp->q->u32_node; |
1da177e4 | 328 | |
0da974f4 | 329 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
330 | if (root_ht == NULL) |
331 | return -ENOBUFS; | |
332 | ||
1da177e4 LT |
333 | root_ht->divisor = 0; |
334 | root_ht->refcnt++; | |
335 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
336 | root_ht->prio = tp->prio; | |
337 | ||
338 | if (tp_c == NULL) { | |
0da974f4 | 339 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
340 | if (tp_c == NULL) { |
341 | kfree(root_ht); | |
342 | return -ENOBUFS; | |
343 | } | |
1da177e4 | 344 | tp_c->q = tp->q; |
72b25a91 | 345 | tp->q->u32_node = tp_c; |
1da177e4 LT |
346 | } |
347 | ||
348 | tp_c->refcnt++; | |
1ce87720 JF |
349 | RCU_INIT_POINTER(root_ht->next, tp_c->hlist); |
350 | rcu_assign_pointer(tp_c->hlist, root_ht); | |
1da177e4 LT |
351 | root_ht->tp_c = tp_c; |
352 | ||
1ce87720 | 353 | rcu_assign_pointer(tp->root, root_ht); |
1da177e4 LT |
354 | tp->data = tp_c; |
355 | return 0; | |
356 | } | |
357 | ||
de5df632 JF |
358 | static int u32_destroy_key(struct tcf_proto *tp, |
359 | struct tc_u_knode *n, | |
360 | bool free_pf) | |
1da177e4 | 361 | { |
18d0264f | 362 | tcf_exts_destroy(&n->exts); |
1da177e4 LT |
363 | if (n->ht_down) |
364 | n->ht_down->refcnt--; | |
365 | #ifdef CONFIG_CLS_U32_PERF | |
de5df632 JF |
366 | if (free_pf) |
367 | free_percpu(n->pf); | |
a1ddcfee JF |
368 | #endif |
369 | #ifdef CONFIG_CLS_U32_MARK | |
de5df632 JF |
370 | if (free_pf) |
371 | free_percpu(n->pcpu_success); | |
1da177e4 LT |
372 | #endif |
373 | kfree(n); | |
374 | return 0; | |
375 | } | |
376 | ||
de5df632 JF |
377 | /* u32_delete_key_rcu should be called when free'ing a copied |
378 | * version of a tc_u_knode obtained from u32_init_knode(). When | |
379 | * copies are obtained from u32_init_knode() the statistics are | |
380 | * shared between the old and new copies to allow readers to | |
381 | * continue to update the statistics during the copy. To support | |
382 | * this the u32_delete_key_rcu variant does not free the percpu | |
383 | * statistics. | |
384 | */ | |
1ce87720 JF |
385 | static void u32_delete_key_rcu(struct rcu_head *rcu) |
386 | { | |
387 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
388 | ||
de5df632 JF |
389 | u32_destroy_key(key->tp, key, false); |
390 | } | |
391 | ||
392 | /* u32_delete_key_freepf_rcu is the rcu callback variant | |
393 | * that free's the entire structure including the statistics | |
394 | * percpu variables. Only use this if the key is not a copy | |
395 | * returned by u32_init_knode(). See u32_delete_key_rcu() | |
396 | * for the variant that should be used with keys return from | |
397 | * u32_init_knode() | |
398 | */ | |
399 | static void u32_delete_key_freepf_rcu(struct rcu_head *rcu) | |
400 | { | |
401 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
402 | ||
403 | u32_destroy_key(key->tp, key, true); | |
1ce87720 JF |
404 | } |
405 | ||
82d567c2 | 406 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) |
1da177e4 | 407 | { |
1ce87720 JF |
408 | struct tc_u_knode __rcu **kp; |
409 | struct tc_u_knode *pkp; | |
a96366bf | 410 | struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); |
1da177e4 LT |
411 | |
412 | if (ht) { | |
1ce87720 JF |
413 | kp = &ht->ht[TC_U32_HASH(key->handle)]; |
414 | for (pkp = rtnl_dereference(*kp); pkp; | |
415 | kp = &pkp->next, pkp = rtnl_dereference(*kp)) { | |
416 | if (pkp == key) { | |
417 | RCU_INIT_POINTER(*kp, key->next); | |
1da177e4 | 418 | |
a0efb80c | 419 | tcf_unbind_filter(tp, &key->res); |
de5df632 | 420 | call_rcu(&key->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
421 | return 0; |
422 | } | |
423 | } | |
424 | } | |
547b792c | 425 | WARN_ON(1); |
1da177e4 LT |
426 | return 0; |
427 | } | |
428 | ||
a1b7c5fd JF |
429 | static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle) |
430 | { | |
431 | struct net_device *dev = tp->q->dev_queue->dev; | |
432 | struct tc_cls_u32_offload u32_offload = {0}; | |
433 | struct tc_to_netdev offload; | |
434 | ||
435 | offload.type = TC_SETUP_CLSU32; | |
436 | offload.cls_u32 = &u32_offload; | |
437 | ||
9e8ce79c | 438 | if (tc_should_offload(dev, 0)) { |
a1b7c5fd JF |
439 | offload.cls_u32->command = TC_CLSU32_DELETE_KNODE; |
440 | offload.cls_u32->knode.handle = handle; | |
441 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, | |
442 | tp->protocol, &offload); | |
443 | } | |
444 | } | |
445 | ||
9e8ce79c JF |
446 | static void u32_replace_hw_hnode(struct tcf_proto *tp, |
447 | struct tc_u_hnode *h, | |
448 | u32 flags) | |
a1b7c5fd JF |
449 | { |
450 | struct net_device *dev = tp->q->dev_queue->dev; | |
451 | struct tc_cls_u32_offload u32_offload = {0}; | |
452 | struct tc_to_netdev offload; | |
453 | ||
454 | offload.type = TC_SETUP_CLSU32; | |
455 | offload.cls_u32 = &u32_offload; | |
456 | ||
9e8ce79c | 457 | if (tc_should_offload(dev, flags)) { |
a1b7c5fd JF |
458 | offload.cls_u32->command = TC_CLSU32_NEW_HNODE; |
459 | offload.cls_u32->hnode.divisor = h->divisor; | |
460 | offload.cls_u32->hnode.handle = h->handle; | |
461 | offload.cls_u32->hnode.prio = h->prio; | |
462 | ||
463 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, | |
464 | tp->protocol, &offload); | |
465 | } | |
466 | } | |
467 | ||
468 | static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h) | |
469 | { | |
470 | struct net_device *dev = tp->q->dev_queue->dev; | |
471 | struct tc_cls_u32_offload u32_offload = {0}; | |
472 | struct tc_to_netdev offload; | |
473 | ||
474 | offload.type = TC_SETUP_CLSU32; | |
475 | offload.cls_u32 = &u32_offload; | |
476 | ||
9e8ce79c | 477 | if (tc_should_offload(dev, 0)) { |
a1b7c5fd JF |
478 | offload.cls_u32->command = TC_CLSU32_DELETE_HNODE; |
479 | offload.cls_u32->hnode.divisor = h->divisor; | |
480 | offload.cls_u32->hnode.handle = h->handle; | |
481 | offload.cls_u32->hnode.prio = h->prio; | |
482 | ||
483 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, | |
484 | tp->protocol, &offload); | |
485 | } | |
486 | } | |
487 | ||
9e8ce79c JF |
488 | static void u32_replace_hw_knode(struct tcf_proto *tp, |
489 | struct tc_u_knode *n, | |
490 | u32 flags) | |
a1b7c5fd JF |
491 | { |
492 | struct net_device *dev = tp->q->dev_queue->dev; | |
493 | struct tc_cls_u32_offload u32_offload = {0}; | |
494 | struct tc_to_netdev offload; | |
495 | ||
496 | offload.type = TC_SETUP_CLSU32; | |
497 | offload.cls_u32 = &u32_offload; | |
498 | ||
9e8ce79c | 499 | if (tc_should_offload(dev, flags)) { |
a1b7c5fd JF |
500 | offload.cls_u32->command = TC_CLSU32_REPLACE_KNODE; |
501 | offload.cls_u32->knode.handle = n->handle; | |
502 | offload.cls_u32->knode.fshift = n->fshift; | |
503 | #ifdef CONFIG_CLS_U32_MARK | |
504 | offload.cls_u32->knode.val = n->val; | |
505 | offload.cls_u32->knode.mask = n->mask; | |
506 | #else | |
507 | offload.cls_u32->knode.val = 0; | |
508 | offload.cls_u32->knode.mask = 0; | |
509 | #endif | |
510 | offload.cls_u32->knode.sel = &n->sel; | |
511 | offload.cls_u32->knode.exts = &n->exts; | |
512 | if (n->ht_down) | |
513 | offload.cls_u32->knode.link_handle = n->ht_down->handle; | |
514 | ||
515 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, | |
516 | tp->protocol, &offload); | |
517 | } | |
518 | } | |
519 | ||
a0efb80c | 520 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) |
1da177e4 LT |
521 | { |
522 | struct tc_u_knode *n; | |
cc7ec456 | 523 | unsigned int h; |
1da177e4 | 524 | |
cc7ec456 | 525 | for (h = 0; h <= ht->divisor; h++) { |
1ce87720 JF |
526 | while ((n = rtnl_dereference(ht->ht[h])) != NULL) { |
527 | RCU_INIT_POINTER(ht->ht[h], | |
528 | rtnl_dereference(n->next)); | |
a0efb80c | 529 | tcf_unbind_filter(tp, &n->res); |
a1b7c5fd | 530 | u32_remove_hw_knode(tp, n->handle); |
de5df632 | 531 | call_rcu(&n->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
532 | } |
533 | } | |
534 | } | |
535 | ||
536 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
537 | { | |
538 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 JF |
539 | struct tc_u_hnode __rcu **hn; |
540 | struct tc_u_hnode *phn; | |
1da177e4 | 541 | |
547b792c | 542 | WARN_ON(ht->refcnt); |
1da177e4 | 543 | |
a0efb80c | 544 | u32_clear_hnode(tp, ht); |
1da177e4 | 545 | |
1ce87720 JF |
546 | hn = &tp_c->hlist; |
547 | for (phn = rtnl_dereference(*hn); | |
548 | phn; | |
549 | hn = &phn->next, phn = rtnl_dereference(*hn)) { | |
550 | if (phn == ht) { | |
a1b7c5fd | 551 | u32_clear_hw_hnode(tp, ht); |
1ce87720 JF |
552 | RCU_INIT_POINTER(*hn, ht->next); |
553 | kfree_rcu(ht, rcu); | |
1da177e4 LT |
554 | return 0; |
555 | } | |
556 | } | |
557 | ||
1da177e4 LT |
558 | return -ENOENT; |
559 | } | |
560 | ||
1e052be6 CW |
561 | static bool ht_empty(struct tc_u_hnode *ht) |
562 | { | |
563 | unsigned int h; | |
564 | ||
565 | for (h = 0; h <= ht->divisor; h++) | |
566 | if (rcu_access_pointer(ht->ht[h])) | |
567 | return false; | |
568 | ||
569 | return true; | |
570 | } | |
571 | ||
572 | static bool u32_destroy(struct tcf_proto *tp, bool force) | |
1da177e4 LT |
573 | { |
574 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 | 575 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 | 576 | |
547b792c | 577 | WARN_ON(root_ht == NULL); |
1da177e4 | 578 | |
1e052be6 CW |
579 | if (!force) { |
580 | if (root_ht) { | |
581 | if (root_ht->refcnt > 1) | |
582 | return false; | |
583 | if (root_ht->refcnt == 1) { | |
584 | if (!ht_empty(root_ht)) | |
585 | return false; | |
586 | } | |
587 | } | |
a6c1aea0 WC |
588 | |
589 | if (tp_c->refcnt > 1) | |
590 | return false; | |
591 | ||
592 | if (tp_c->refcnt == 1) { | |
593 | struct tc_u_hnode *ht; | |
594 | ||
595 | for (ht = rtnl_dereference(tp_c->hlist); | |
596 | ht; | |
597 | ht = rtnl_dereference(ht->next)) | |
598 | if (!ht_empty(ht)) | |
599 | return false; | |
600 | } | |
1e052be6 CW |
601 | } |
602 | ||
1da177e4 LT |
603 | if (root_ht && --root_ht->refcnt == 0) |
604 | u32_destroy_hnode(tp, root_ht); | |
605 | ||
606 | if (--tp_c->refcnt == 0) { | |
607 | struct tc_u_hnode *ht; | |
1da177e4 | 608 | |
72b25a91 | 609 | tp->q->u32_node = NULL; |
1da177e4 | 610 | |
1ce87720 JF |
611 | for (ht = rtnl_dereference(tp_c->hlist); |
612 | ht; | |
613 | ht = rtnl_dereference(ht->next)) { | |
e56cfad1 | 614 | ht->refcnt--; |
a0efb80c | 615 | u32_clear_hnode(tp, ht); |
e56cfad1 | 616 | } |
1da177e4 | 617 | |
1ce87720 JF |
618 | while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) { |
619 | RCU_INIT_POINTER(tp_c->hlist, ht->next); | |
620 | kfree_rcu(ht, rcu); | |
3ff50b79 | 621 | } |
1da177e4 LT |
622 | |
623 | kfree(tp_c); | |
624 | } | |
625 | ||
626 | tp->data = NULL; | |
1e052be6 | 627 | return true; |
1da177e4 LT |
628 | } |
629 | ||
630 | static int u32_delete(struct tcf_proto *tp, unsigned long arg) | |
631 | { | |
cc7ec456 | 632 | struct tc_u_hnode *ht = (struct tc_u_hnode *)arg; |
1ce87720 | 633 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 LT |
634 | |
635 | if (ht == NULL) | |
636 | return 0; | |
637 | ||
a1b7c5fd JF |
638 | if (TC_U32_KEY(ht->handle)) { |
639 | u32_remove_hw_knode(tp, ht->handle); | |
cc7ec456 | 640 | return u32_delete_key(tp, (struct tc_u_knode *)ht); |
a1b7c5fd | 641 | } |
1da177e4 | 642 | |
1ce87720 | 643 | if (root_ht == ht) |
1da177e4 LT |
644 | return -EINVAL; |
645 | ||
e56cfad1 JP |
646 | if (ht->refcnt == 1) { |
647 | ht->refcnt--; | |
1da177e4 | 648 | u32_destroy_hnode(tp, ht); |
e56cfad1 JP |
649 | } else { |
650 | return -EBUSY; | |
651 | } | |
1da177e4 LT |
652 | |
653 | return 0; | |
654 | } | |
655 | ||
7801db8a | 656 | #define NR_U32_NODE (1<<12) |
1da177e4 LT |
657 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) |
658 | { | |
659 | struct tc_u_knode *n; | |
7801db8a CW |
660 | unsigned long i; |
661 | unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long), | |
662 | GFP_KERNEL); | |
663 | if (!bitmap) | |
664 | return handle | 0xFFF; | |
1da177e4 | 665 | |
1ce87720 JF |
666 | for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]); |
667 | n; | |
668 | n = rtnl_dereference(n->next)) | |
7801db8a | 669 | set_bit(TC_U32_NODE(n->handle), bitmap); |
1da177e4 | 670 | |
7801db8a CW |
671 | i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800); |
672 | if (i >= NR_U32_NODE) | |
673 | i = find_next_zero_bit(bitmap, NR_U32_NODE, 1); | |
674 | ||
675 | kfree(bitmap); | |
676 | return handle | (i >= NR_U32_NODE ? 0xFFF : i); | |
1da177e4 LT |
677 | } |
678 | ||
6fa8c014 PM |
679 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
680 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
681 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
682 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
683 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
684 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
685 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
686 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
9e8ce79c | 687 | [TCA_U32_FLAGS] = { .type = NLA_U32 }, |
6fa8c014 PM |
688 | }; |
689 | ||
c1b52739 BL |
690 | static int u32_set_parms(struct net *net, struct tcf_proto *tp, |
691 | unsigned long base, struct tc_u_hnode *ht, | |
add93b61 | 692 | struct tc_u_knode *n, struct nlattr **tb, |
2f7ef2f8 | 693 | struct nlattr *est, bool ovr) |
1da177e4 LT |
694 | { |
695 | int err; | |
696 | struct tcf_exts e; | |
697 | ||
5da57f42 | 698 | tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE); |
2f7ef2f8 | 699 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
700 | if (err < 0) |
701 | return err; | |
702 | ||
703 | err = -EINVAL; | |
add93b61 | 704 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 705 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 706 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 LT |
707 | |
708 | if (TC_U32_KEY(handle)) | |
709 | goto errout; | |
710 | ||
711 | if (handle) { | |
712 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
713 | ||
714 | if (ht_down == NULL) | |
715 | goto errout; | |
716 | ht_down->refcnt++; | |
717 | } | |
718 | ||
1ce87720 JF |
719 | ht_old = rtnl_dereference(n->ht_down); |
720 | rcu_assign_pointer(n->ht_down, ht_down); | |
1da177e4 | 721 | |
47a1a1d4 PM |
722 | if (ht_old) |
723 | ht_old->refcnt--; | |
1da177e4 | 724 | } |
add93b61 | 725 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 726 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
727 | tcf_bind_filter(tp, &n->res, base); |
728 | } | |
729 | ||
730 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 731 | if (tb[TCA_U32_INDEV]) { |
2519a602 WC |
732 | int ret; |
733 | ret = tcf_change_indev(net, tb[TCA_U32_INDEV]); | |
734 | if (ret < 0) | |
1da177e4 | 735 | goto errout; |
2519a602 | 736 | n->ifindex = ret; |
1da177e4 LT |
737 | } |
738 | #endif | |
739 | tcf_exts_change(tp, &n->exts, &e); | |
740 | ||
741 | return 0; | |
742 | errout: | |
18d0264f | 743 | tcf_exts_destroy(&e); |
1da177e4 LT |
744 | return err; |
745 | } | |
746 | ||
de5df632 JF |
747 | static void u32_replace_knode(struct tcf_proto *tp, |
748 | struct tc_u_common *tp_c, | |
749 | struct tc_u_knode *n) | |
750 | { | |
751 | struct tc_u_knode __rcu **ins; | |
752 | struct tc_u_knode *pins; | |
753 | struct tc_u_hnode *ht; | |
754 | ||
755 | if (TC_U32_HTID(n->handle) == TC_U32_ROOT) | |
756 | ht = rtnl_dereference(tp->root); | |
757 | else | |
758 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle)); | |
759 | ||
760 | ins = &ht->ht[TC_U32_HASH(n->handle)]; | |
761 | ||
762 | /* The node must always exist for it to be replaced if this is not the | |
763 | * case then something went very wrong elsewhere. | |
764 | */ | |
765 | for (pins = rtnl_dereference(*ins); ; | |
766 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
767 | if (pins->handle == n->handle) | |
768 | break; | |
769 | ||
770 | RCU_INIT_POINTER(n->next, pins->next); | |
771 | rcu_assign_pointer(*ins, n); | |
772 | } | |
773 | ||
774 | static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp, | |
775 | struct tc_u_knode *n) | |
776 | { | |
777 | struct tc_u_knode *new; | |
778 | struct tc_u32_sel *s = &n->sel; | |
779 | ||
780 | new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), | |
781 | GFP_KERNEL); | |
782 | ||
783 | if (!new) | |
784 | return NULL; | |
785 | ||
786 | RCU_INIT_POINTER(new->next, n->next); | |
787 | new->handle = n->handle; | |
788 | RCU_INIT_POINTER(new->ht_up, n->ht_up); | |
789 | ||
790 | #ifdef CONFIG_NET_CLS_IND | |
791 | new->ifindex = n->ifindex; | |
792 | #endif | |
793 | new->fshift = n->fshift; | |
794 | new->res = n->res; | |
9e8ce79c | 795 | new->flags = n->flags; |
de5df632 JF |
796 | RCU_INIT_POINTER(new->ht_down, n->ht_down); |
797 | ||
798 | /* bump reference count as long as we hold pointer to structure */ | |
799 | if (new->ht_down) | |
800 | new->ht_down->refcnt++; | |
801 | ||
802 | #ifdef CONFIG_CLS_U32_PERF | |
803 | /* Statistics may be incremented by readers during update | |
804 | * so we must keep them in tact. When the node is later destroyed | |
805 | * a special destroy call must be made to not free the pf memory. | |
806 | */ | |
807 | new->pf = n->pf; | |
808 | #endif | |
809 | ||
810 | #ifdef CONFIG_CLS_U32_MARK | |
811 | new->val = n->val; | |
812 | new->mask = n->mask; | |
813 | /* Similarly success statistics must be moved as pointers */ | |
814 | new->pcpu_success = n->pcpu_success; | |
815 | #endif | |
816 | new->tp = tp; | |
817 | memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
818 | ||
819 | tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE); | |
820 | ||
821 | return new; | |
822 | } | |
823 | ||
c1b52739 | 824 | static int u32_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 825 | struct tcf_proto *tp, unsigned long base, u32 handle, |
add93b61 | 826 | struct nlattr **tca, |
2f7ef2f8 | 827 | unsigned long *arg, bool ovr) |
1da177e4 LT |
828 | { |
829 | struct tc_u_common *tp_c = tp->data; | |
830 | struct tc_u_hnode *ht; | |
831 | struct tc_u_knode *n; | |
832 | struct tc_u32_sel *s; | |
add93b61 PM |
833 | struct nlattr *opt = tca[TCA_OPTIONS]; |
834 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
9e8ce79c | 835 | u32 htid, flags = 0; |
1da177e4 | 836 | int err; |
459d5f62 JF |
837 | #ifdef CONFIG_CLS_U32_PERF |
838 | size_t size; | |
839 | #endif | |
1da177e4 LT |
840 | |
841 | if (opt == NULL) | |
842 | return handle ? -EINVAL : 0; | |
843 | ||
6fa8c014 | 844 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy); |
cee63723 PM |
845 | if (err < 0) |
846 | return err; | |
1da177e4 | 847 | |
9e8ce79c JF |
848 | if (tb[TCA_U32_FLAGS]) |
849 | flags = nla_get_u32(tb[TCA_U32_FLAGS]); | |
850 | ||
cc7ec456 ED |
851 | n = (struct tc_u_knode *)*arg; |
852 | if (n) { | |
de5df632 JF |
853 | struct tc_u_knode *new; |
854 | ||
1da177e4 LT |
855 | if (TC_U32_KEY(n->handle) == 0) |
856 | return -EINVAL; | |
857 | ||
9e8ce79c JF |
858 | if (n->flags != flags) |
859 | return -EINVAL; | |
860 | ||
de5df632 JF |
861 | new = u32_init_knode(tp, n); |
862 | if (!new) | |
863 | return -ENOMEM; | |
864 | ||
865 | err = u32_set_parms(net, tp, base, | |
866 | rtnl_dereference(n->ht_up), new, tb, | |
867 | tca[TCA_RATE], ovr); | |
868 | ||
869 | if (err) { | |
870 | u32_destroy_key(tp, new, false); | |
871 | return err; | |
872 | } | |
873 | ||
874 | u32_replace_knode(tp, tp_c, new); | |
a0efb80c | 875 | tcf_unbind_filter(tp, &n->res); |
de5df632 | 876 | call_rcu(&n->rcu, u32_delete_key_rcu); |
9e8ce79c | 877 | u32_replace_hw_knode(tp, new, flags); |
de5df632 | 878 | return 0; |
1da177e4 LT |
879 | } |
880 | ||
add93b61 | 881 | if (tb[TCA_U32_DIVISOR]) { |
cc7ec456 | 882 | unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); |
1da177e4 LT |
883 | |
884 | if (--divisor > 0x100) | |
885 | return -EINVAL; | |
886 | if (TC_U32_KEY(handle)) | |
887 | return -EINVAL; | |
888 | if (handle == 0) { | |
889 | handle = gen_new_htid(tp->data); | |
890 | if (handle == 0) | |
891 | return -ENOMEM; | |
892 | } | |
cc7ec456 | 893 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); |
1da177e4 LT |
894 | if (ht == NULL) |
895 | return -ENOBUFS; | |
1da177e4 | 896 | ht->tp_c = tp_c; |
e56cfad1 | 897 | ht->refcnt = 1; |
1da177e4 LT |
898 | ht->divisor = divisor; |
899 | ht->handle = handle; | |
900 | ht->prio = tp->prio; | |
1ce87720 JF |
901 | RCU_INIT_POINTER(ht->next, tp_c->hlist); |
902 | rcu_assign_pointer(tp_c->hlist, ht); | |
1da177e4 | 903 | *arg = (unsigned long)ht; |
a1b7c5fd | 904 | |
9e8ce79c | 905 | u32_replace_hw_hnode(tp, ht, flags); |
1da177e4 LT |
906 | return 0; |
907 | } | |
908 | ||
add93b61 | 909 | if (tb[TCA_U32_HASH]) { |
1587bac4 | 910 | htid = nla_get_u32(tb[TCA_U32_HASH]); |
1da177e4 | 911 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
1ce87720 | 912 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
913 | htid = ht->handle; |
914 | } else { | |
915 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
916 | if (ht == NULL) | |
917 | return -EINVAL; | |
918 | } | |
919 | } else { | |
1ce87720 | 920 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
921 | htid = ht->handle; |
922 | } | |
923 | ||
924 | if (ht->divisor < TC_U32_HASH(htid)) | |
925 | return -EINVAL; | |
926 | ||
927 | if (handle) { | |
928 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
929 | return -EINVAL; | |
930 | handle = htid | TC_U32_NODE(handle); | |
931 | } else | |
932 | handle = gen_new_kid(ht, htid); | |
933 | ||
6fa8c014 | 934 | if (tb[TCA_U32_SEL] == NULL) |
1da177e4 LT |
935 | return -EINVAL; |
936 | ||
add93b61 | 937 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 938 | |
0da974f4 | 939 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
1da177e4 LT |
940 | if (n == NULL) |
941 | return -ENOBUFS; | |
942 | ||
1da177e4 | 943 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 JF |
944 | size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64); |
945 | n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt)); | |
946 | if (!n->pf) { | |
1da177e4 LT |
947 | kfree(n); |
948 | return -ENOBUFS; | |
949 | } | |
1da177e4 LT |
950 | #endif |
951 | ||
952 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
a96366bf | 953 | RCU_INIT_POINTER(n->ht_up, ht); |
1da177e4 | 954 | n->handle = handle; |
b2268016 | 955 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
9e8ce79c | 956 | n->flags = flags; |
5da57f42 | 957 | tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE); |
1ce87720 | 958 | n->tp = tp; |
1da177e4 LT |
959 | |
960 | #ifdef CONFIG_CLS_U32_MARK | |
459d5f62 | 961 | n->pcpu_success = alloc_percpu(u32); |
a1ddcfee JF |
962 | if (!n->pcpu_success) { |
963 | err = -ENOMEM; | |
964 | goto errout; | |
965 | } | |
459d5f62 | 966 | |
add93b61 | 967 | if (tb[TCA_U32_MARK]) { |
1da177e4 LT |
968 | struct tc_u32_mark *mark; |
969 | ||
add93b61 | 970 | mark = nla_data(tb[TCA_U32_MARK]); |
459d5f62 JF |
971 | n->val = mark->val; |
972 | n->mask = mark->mask; | |
1da177e4 LT |
973 | } |
974 | #endif | |
975 | ||
2f7ef2f8 | 976 | err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr); |
1da177e4 | 977 | if (err == 0) { |
1ce87720 JF |
978 | struct tc_u_knode __rcu **ins; |
979 | struct tc_u_knode *pins; | |
980 | ||
981 | ins = &ht->ht[TC_U32_HASH(handle)]; | |
982 | for (pins = rtnl_dereference(*ins); pins; | |
983 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
984 | if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle)) | |
1da177e4 LT |
985 | break; |
986 | ||
1ce87720 JF |
987 | RCU_INIT_POINTER(n->next, pins); |
988 | rcu_assign_pointer(*ins, n); | |
9e8ce79c | 989 | u32_replace_hw_knode(tp, n, flags); |
1da177e4 LT |
990 | *arg = (unsigned long)n; |
991 | return 0; | |
992 | } | |
a1ddcfee JF |
993 | |
994 | #ifdef CONFIG_CLS_U32_MARK | |
995 | free_percpu(n->pcpu_success); | |
a2aeb02a | 996 | errout: |
a1ddcfee JF |
997 | #endif |
998 | ||
1da177e4 | 999 | #ifdef CONFIG_CLS_U32_PERF |
1ce87720 | 1000 | free_percpu(n->pf); |
1da177e4 LT |
1001 | #endif |
1002 | kfree(n); | |
1003 | return err; | |
1004 | } | |
1005 | ||
1006 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
1007 | { | |
1008 | struct tc_u_common *tp_c = tp->data; | |
1009 | struct tc_u_hnode *ht; | |
1010 | struct tc_u_knode *n; | |
cc7ec456 | 1011 | unsigned int h; |
1da177e4 LT |
1012 | |
1013 | if (arg->stop) | |
1014 | return; | |
1015 | ||
1ce87720 JF |
1016 | for (ht = rtnl_dereference(tp_c->hlist); |
1017 | ht; | |
1018 | ht = rtnl_dereference(ht->next)) { | |
1da177e4 LT |
1019 | if (ht->prio != tp->prio) |
1020 | continue; | |
1021 | if (arg->count >= arg->skip) { | |
1022 | if (arg->fn(tp, (unsigned long)ht, arg) < 0) { | |
1023 | arg->stop = 1; | |
1024 | return; | |
1025 | } | |
1026 | } | |
1027 | arg->count++; | |
1028 | for (h = 0; h <= ht->divisor; h++) { | |
1ce87720 JF |
1029 | for (n = rtnl_dereference(ht->ht[h]); |
1030 | n; | |
1031 | n = rtnl_dereference(n->next)) { | |
1da177e4 LT |
1032 | if (arg->count < arg->skip) { |
1033 | arg->count++; | |
1034 | continue; | |
1035 | } | |
1036 | if (arg->fn(tp, (unsigned long)n, arg) < 0) { | |
1037 | arg->stop = 1; | |
1038 | return; | |
1039 | } | |
1040 | arg->count++; | |
1041 | } | |
1042 | } | |
1043 | } | |
1044 | } | |
1045 | ||
832d1d5b | 1046 | static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
1047 | struct sk_buff *skb, struct tcmsg *t) |
1048 | { | |
cc7ec456 | 1049 | struct tc_u_knode *n = (struct tc_u_knode *)fh; |
1ce87720 | 1050 | struct tc_u_hnode *ht_up, *ht_down; |
4b3550ef | 1051 | struct nlattr *nest; |
1da177e4 LT |
1052 | |
1053 | if (n == NULL) | |
1054 | return skb->len; | |
1055 | ||
1056 | t->tcm_handle = n->handle; | |
1057 | ||
4b3550ef PM |
1058 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1059 | if (nest == NULL) | |
1060 | goto nla_put_failure; | |
1da177e4 LT |
1061 | |
1062 | if (TC_U32_KEY(n->handle) == 0) { | |
cc7ec456 ED |
1063 | struct tc_u_hnode *ht = (struct tc_u_hnode *)fh; |
1064 | u32 divisor = ht->divisor + 1; | |
1065 | ||
1b34ec43 DM |
1066 | if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) |
1067 | goto nla_put_failure; | |
1da177e4 | 1068 | } else { |
459d5f62 JF |
1069 | #ifdef CONFIG_CLS_U32_PERF |
1070 | struct tc_u32_pcnt *gpf; | |
459d5f62 | 1071 | int cpu; |
80aab73d | 1072 | #endif |
459d5f62 | 1073 | |
1b34ec43 DM |
1074 | if (nla_put(skb, TCA_U32_SEL, |
1075 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
1076 | &n->sel)) | |
1077 | goto nla_put_failure; | |
1ce87720 JF |
1078 | |
1079 | ht_up = rtnl_dereference(n->ht_up); | |
1080 | if (ht_up) { | |
1da177e4 | 1081 | u32 htid = n->handle & 0xFFFFF000; |
1b34ec43 DM |
1082 | if (nla_put_u32(skb, TCA_U32_HASH, htid)) |
1083 | goto nla_put_failure; | |
1da177e4 | 1084 | } |
1b34ec43 DM |
1085 | if (n->res.classid && |
1086 | nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) | |
1087 | goto nla_put_failure; | |
1ce87720 JF |
1088 | |
1089 | ht_down = rtnl_dereference(n->ht_down); | |
1090 | if (ht_down && | |
1091 | nla_put_u32(skb, TCA_U32_LINK, ht_down->handle)) | |
1b34ec43 | 1092 | goto nla_put_failure; |
1da177e4 | 1093 | |
9e8ce79c JF |
1094 | if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags)) |
1095 | goto nla_put_failure; | |
1096 | ||
1da177e4 | 1097 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 JF |
1098 | if ((n->val || n->mask)) { |
1099 | struct tc_u32_mark mark = {.val = n->val, | |
1100 | .mask = n->mask, | |
1101 | .success = 0}; | |
80aab73d | 1102 | int cpum; |
459d5f62 | 1103 | |
80aab73d JF |
1104 | for_each_possible_cpu(cpum) { |
1105 | __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum); | |
459d5f62 JF |
1106 | |
1107 | mark.success += cnt; | |
1108 | } | |
1109 | ||
1110 | if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark)) | |
1111 | goto nla_put_failure; | |
1112 | } | |
1da177e4 LT |
1113 | #endif |
1114 | ||
5da57f42 | 1115 | if (tcf_exts_dump(skb, &n->exts) < 0) |
add93b61 | 1116 | goto nla_put_failure; |
1da177e4 LT |
1117 | |
1118 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 WC |
1119 | if (n->ifindex) { |
1120 | struct net_device *dev; | |
1121 | dev = __dev_get_by_index(net, n->ifindex); | |
1122 | if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) | |
1123 | goto nla_put_failure; | |
1124 | } | |
1da177e4 LT |
1125 | #endif |
1126 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 JF |
1127 | gpf = kzalloc(sizeof(struct tc_u32_pcnt) + |
1128 | n->sel.nkeys * sizeof(u64), | |
1129 | GFP_KERNEL); | |
1130 | if (!gpf) | |
1131 | goto nla_put_failure; | |
1132 | ||
1133 | for_each_possible_cpu(cpu) { | |
1134 | int i; | |
1135 | struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu); | |
1136 | ||
1137 | gpf->rcnt += pf->rcnt; | |
1138 | gpf->rhit += pf->rhit; | |
1139 | for (i = 0; i < n->sel.nkeys; i++) | |
1140 | gpf->kcnts[i] += pf->kcnts[i]; | |
1141 | } | |
1142 | ||
1b34ec43 DM |
1143 | if (nla_put(skb, TCA_U32_PCNT, |
1144 | sizeof(struct tc_u32_pcnt) + n->sel.nkeys*sizeof(u64), | |
459d5f62 JF |
1145 | gpf)) { |
1146 | kfree(gpf); | |
1b34ec43 | 1147 | goto nla_put_failure; |
459d5f62 JF |
1148 | } |
1149 | kfree(gpf); | |
1da177e4 LT |
1150 | #endif |
1151 | } | |
1152 | ||
4b3550ef PM |
1153 | nla_nest_end(skb, nest); |
1154 | ||
1da177e4 | 1155 | if (TC_U32_KEY(n->handle)) |
5da57f42 | 1156 | if (tcf_exts_dump_stats(skb, &n->exts) < 0) |
add93b61 | 1157 | goto nla_put_failure; |
1da177e4 LT |
1158 | return skb->len; |
1159 | ||
add93b61 | 1160 | nla_put_failure: |
4b3550ef | 1161 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1162 | return -1; |
1163 | } | |
1164 | ||
2eb9d75c | 1165 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
1166 | .kind = "u32", |
1167 | .classify = u32_classify, | |
1168 | .init = u32_init, | |
1169 | .destroy = u32_destroy, | |
1170 | .get = u32_get, | |
1da177e4 LT |
1171 | .change = u32_change, |
1172 | .delete = u32_delete, | |
1173 | .walk = u32_walk, | |
1174 | .dump = u32_dump, | |
1175 | .owner = THIS_MODULE, | |
1176 | }; | |
1177 | ||
1178 | static int __init init_u32(void) | |
1179 | { | |
6ff9c364 | 1180 | pr_info("u32 classifier\n"); |
1da177e4 | 1181 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 1182 | pr_info(" Performance counters on\n"); |
1da177e4 | 1183 | #endif |
1da177e4 | 1184 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 1185 | pr_info(" input device check on\n"); |
1da177e4 LT |
1186 | #endif |
1187 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 1188 | pr_info(" Actions configured\n"); |
1da177e4 LT |
1189 | #endif |
1190 | return register_tcf_proto_ops(&cls_u32_ops); | |
1191 | } | |
1192 | ||
10297b99 | 1193 | static void __exit exit_u32(void) |
1da177e4 LT |
1194 | { |
1195 | unregister_tcf_proto_ops(&cls_u32_ops); | |
1196 | } | |
1197 | ||
1198 | module_init(init_u32) | |
1199 | module_exit(exit_u32) | |
1200 | MODULE_LICENSE("GPL"); |