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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> |
3cd904ec WC |
43 | #include <linux/netdevice.h> |
44 | #include <linux/hash.h> | |
0ba48053 | 45 | #include <net/netlink.h> |
1da177e4 LT |
46 | #include <net/act_api.h> |
47 | #include <net/pkt_cls.h> | |
e7614370 | 48 | #include <linux/idr.h> |
1da177e4 | 49 | |
cc7ec456 | 50 | struct tc_u_knode { |
1ce87720 | 51 | struct tc_u_knode __rcu *next; |
1da177e4 | 52 | u32 handle; |
1ce87720 | 53 | struct tc_u_hnode __rcu *ht_up; |
1da177e4 LT |
54 | struct tcf_exts exts; |
55 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 56 | int ifindex; |
1da177e4 LT |
57 | #endif |
58 | u8 fshift; | |
59 | struct tcf_result res; | |
1ce87720 | 60 | struct tc_u_hnode __rcu *ht_down; |
1da177e4 | 61 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 | 62 | struct tc_u32_pcnt __percpu *pf; |
1da177e4 | 63 | #endif |
9e8ce79c | 64 | u32 flags; |
1da177e4 | 65 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 JF |
66 | u32 val; |
67 | u32 mask; | |
68 | u32 __percpu *pcpu_success; | |
1da177e4 | 69 | #endif |
1ce87720 | 70 | struct tcf_proto *tp; |
c0d378ef CW |
71 | union { |
72 | struct work_struct work; | |
73 | struct rcu_head rcu; | |
74 | }; | |
4e2840ee JF |
75 | /* The 'sel' field MUST be the last field in structure to allow for |
76 | * tc_u32_keys allocated at end of structure. | |
77 | */ | |
78 | struct tc_u32_sel sel; | |
1da177e4 LT |
79 | }; |
80 | ||
cc7ec456 | 81 | struct tc_u_hnode { |
1ce87720 | 82 | struct tc_u_hnode __rcu *next; |
1da177e4 LT |
83 | u32 handle; |
84 | u32 prio; | |
85 | struct tc_u_common *tp_c; | |
86 | int refcnt; | |
cc7ec456 | 87 | unsigned int divisor; |
e7614370 | 88 | struct idr handle_idr; |
1ce87720 | 89 | struct rcu_head rcu; |
5778d39d WC |
90 | /* The 'ht' field MUST be the last field in structure to allow for |
91 | * more entries allocated at end of structure. | |
92 | */ | |
93 | struct tc_u_knode __rcu *ht[1]; | |
1da177e4 LT |
94 | }; |
95 | ||
cc7ec456 | 96 | struct tc_u_common { |
1ce87720 | 97 | struct tc_u_hnode __rcu *hlist; |
7fa9d974 | 98 | struct tcf_block *block; |
1da177e4 | 99 | int refcnt; |
e7614370 | 100 | struct idr handle_idr; |
3cd904ec | 101 | struct hlist_node hnode; |
1ce87720 | 102 | struct rcu_head rcu; |
1da177e4 LT |
103 | }; |
104 | ||
cc7ec456 ED |
105 | static inline unsigned int u32_hash_fold(__be32 key, |
106 | const struct tc_u32_sel *sel, | |
107 | u8 fshift) | |
1da177e4 | 108 | { |
cc7ec456 | 109 | unsigned int h = ntohl(key & sel->hmask) >> fshift; |
1da177e4 LT |
110 | |
111 | return h; | |
112 | } | |
113 | ||
5a7a5555 JHS |
114 | static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
115 | struct tcf_result *res) | |
1da177e4 LT |
116 | { |
117 | struct { | |
118 | struct tc_u_knode *knode; | |
fbc2e7d9 | 119 | unsigned int off; |
1da177e4 LT |
120 | } stack[TC_U32_MAXDEPTH]; |
121 | ||
1ce87720 | 122 | struct tc_u_hnode *ht = rcu_dereference_bh(tp->root); |
fbc2e7d9 | 123 | unsigned int off = skb_network_offset(skb); |
1da177e4 LT |
124 | struct tc_u_knode *n; |
125 | int sdepth = 0; | |
126 | int off2 = 0; | |
127 | int sel = 0; | |
128 | #ifdef CONFIG_CLS_U32_PERF | |
129 | int j; | |
130 | #endif | |
131 | int i, r; | |
132 | ||
133 | next_ht: | |
1ce87720 | 134 | n = rcu_dereference_bh(ht->ht[sel]); |
1da177e4 LT |
135 | |
136 | next_knode: | |
137 | if (n) { | |
138 | struct tc_u32_key *key = n->sel.keys; | |
139 | ||
140 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 141 | __this_cpu_inc(n->pf->rcnt); |
1da177e4 LT |
142 | j = 0; |
143 | #endif | |
144 | ||
d34e3e18 SS |
145 | if (tc_skip_sw(n->flags)) { |
146 | n = rcu_dereference_bh(n->next); | |
147 | goto next_knode; | |
148 | } | |
149 | ||
1da177e4 | 150 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 | 151 | if ((skb->mark & n->mask) != n->val) { |
1ce87720 | 152 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
153 | goto next_knode; |
154 | } else { | |
459d5f62 | 155 | __this_cpu_inc(*n->pcpu_success); |
1da177e4 LT |
156 | } |
157 | #endif | |
158 | ||
cc7ec456 | 159 | for (i = n->sel.nkeys; i > 0; i--, key++) { |
66d50d25 | 160 | int toff = off + key->off + (off2 & key->offmask); |
86fce3ba | 161 | __be32 *data, hdata; |
fbc2e7d9 | 162 | |
4e18b3ed | 163 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 164 | goto out; |
165 | ||
86fce3ba | 166 | data = skb_header_pointer(skb, toff, 4, &hdata); |
fbc2e7d9 CG |
167 | if (!data) |
168 | goto out; | |
169 | if ((*data ^ key->val) & key->mask) { | |
1ce87720 | 170 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
171 | goto next_knode; |
172 | } | |
173 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 174 | __this_cpu_inc(n->pf->kcnts[j]); |
1da177e4 LT |
175 | j++; |
176 | #endif | |
177 | } | |
1ce87720 JF |
178 | |
179 | ht = rcu_dereference_bh(n->ht_down); | |
180 | if (!ht) { | |
1da177e4 | 181 | check_terminal: |
cc7ec456 | 182 | if (n->sel.flags & TC_U32_TERMINAL) { |
1da177e4 LT |
183 | |
184 | *res = n->res; | |
185 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 186 | if (!tcf_match_indev(skb, n->ifindex)) { |
1ce87720 | 187 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
188 | goto next_knode; |
189 | } | |
190 | #endif | |
191 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 192 | __this_cpu_inc(n->pf->rhit); |
1da177e4 LT |
193 | #endif |
194 | r = tcf_exts_exec(skb, &n->exts, res); | |
195 | if (r < 0) { | |
1ce87720 | 196 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
197 | goto next_knode; |
198 | } | |
199 | ||
200 | return r; | |
201 | } | |
1ce87720 | 202 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
203 | goto next_knode; |
204 | } | |
205 | ||
206 | /* PUSH */ | |
207 | if (sdepth >= TC_U32_MAXDEPTH) | |
208 | goto deadloop; | |
209 | stack[sdepth].knode = n; | |
fbc2e7d9 | 210 | stack[sdepth].off = off; |
1da177e4 LT |
211 | sdepth++; |
212 | ||
1ce87720 | 213 | ht = rcu_dereference_bh(n->ht_down); |
1da177e4 | 214 | sel = 0; |
fbc2e7d9 | 215 | if (ht->divisor) { |
86fce3ba | 216 | __be32 *data, hdata; |
fbc2e7d9 CG |
217 | |
218 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
86fce3ba | 219 | &hdata); |
fbc2e7d9 CG |
220 | if (!data) |
221 | goto out; | |
222 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
223 | n->fshift); | |
224 | } | |
cc7ec456 | 225 | if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) |
1da177e4 LT |
226 | goto next_ht; |
227 | ||
cc7ec456 | 228 | if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { |
1da177e4 | 229 | off2 = n->sel.off + 3; |
fbc2e7d9 | 230 | if (n->sel.flags & TC_U32_VAROFFSET) { |
86fce3ba | 231 | __be16 *data, hdata; |
fbc2e7d9 CG |
232 | |
233 | data = skb_header_pointer(skb, | |
234 | off + n->sel.offoff, | |
86fce3ba | 235 | 2, &hdata); |
fbc2e7d9 CG |
236 | if (!data) |
237 | goto out; | |
238 | off2 += ntohs(n->sel.offmask & *data) >> | |
239 | n->sel.offshift; | |
240 | } | |
1da177e4 LT |
241 | off2 &= ~3; |
242 | } | |
cc7ec456 | 243 | if (n->sel.flags & TC_U32_EAT) { |
fbc2e7d9 | 244 | off += off2; |
1da177e4 LT |
245 | off2 = 0; |
246 | } | |
247 | ||
fbc2e7d9 | 248 | if (off < skb->len) |
1da177e4 LT |
249 | goto next_ht; |
250 | } | |
251 | ||
252 | /* POP */ | |
253 | if (sdepth--) { | |
254 | n = stack[sdepth].knode; | |
1ce87720 | 255 | ht = rcu_dereference_bh(n->ht_up); |
fbc2e7d9 | 256 | off = stack[sdepth].off; |
1da177e4 LT |
257 | goto check_terminal; |
258 | } | |
fbc2e7d9 | 259 | out: |
1da177e4 LT |
260 | return -1; |
261 | ||
262 | deadloop: | |
e87cc472 | 263 | net_warn_ratelimited("cls_u32: dead loop\n"); |
1da177e4 LT |
264 | return -1; |
265 | } | |
266 | ||
5a7a5555 | 267 | static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) |
1da177e4 LT |
268 | { |
269 | struct tc_u_hnode *ht; | |
270 | ||
1ce87720 JF |
271 | for (ht = rtnl_dereference(tp_c->hlist); |
272 | ht; | |
273 | ht = rtnl_dereference(ht->next)) | |
1da177e4 LT |
274 | if (ht->handle == handle) |
275 | break; | |
276 | ||
277 | return ht; | |
278 | } | |
279 | ||
5a7a5555 | 280 | static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle) |
1da177e4 | 281 | { |
cc7ec456 | 282 | unsigned int sel; |
1da177e4 LT |
283 | struct tc_u_knode *n = NULL; |
284 | ||
285 | sel = TC_U32_HASH(handle); | |
286 | if (sel > ht->divisor) | |
287 | goto out; | |
288 | ||
1ce87720 JF |
289 | for (n = rtnl_dereference(ht->ht[sel]); |
290 | n; | |
291 | n = rtnl_dereference(n->next)) | |
1da177e4 LT |
292 | if (n->handle == handle) |
293 | break; | |
294 | out: | |
295 | return n; | |
296 | } | |
297 | ||
298 | ||
8113c095 | 299 | static void *u32_get(struct tcf_proto *tp, u32 handle) |
1da177e4 LT |
300 | { |
301 | struct tc_u_hnode *ht; | |
302 | struct tc_u_common *tp_c = tp->data; | |
303 | ||
304 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
1ce87720 | 305 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
306 | else |
307 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
308 | ||
309 | if (!ht) | |
8113c095 | 310 | return NULL; |
1da177e4 LT |
311 | |
312 | if (TC_U32_KEY(handle) == 0) | |
8113c095 | 313 | return ht; |
1da177e4 | 314 | |
8113c095 | 315 | return u32_lookup_key(ht, handle); |
1da177e4 LT |
316 | } |
317 | ||
e7614370 | 318 | static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr) |
1da177e4 | 319 | { |
e7614370 CW |
320 | unsigned long idr_index; |
321 | int err; | |
1da177e4 | 322 | |
e7614370 | 323 | /* This is only used inside rtnl lock it is safe to increment |
1ce87720 JF |
324 | * without read _copy_ update semantics |
325 | */ | |
e7614370 CW |
326 | err = idr_alloc_ext(&tp_c->handle_idr, ptr, &idr_index, |
327 | 1, 0x7FF, GFP_KERNEL); | |
328 | if (err) | |
329 | return 0; | |
330 | return (u32)(idr_index | 0x800) << 20; | |
1da177e4 LT |
331 | } |
332 | ||
3cd904ec WC |
333 | static struct hlist_head *tc_u_common_hash; |
334 | ||
335 | #define U32_HASH_SHIFT 10 | |
336 | #define U32_HASH_SIZE (1 << U32_HASH_SHIFT) | |
337 | ||
338 | static unsigned int tc_u_hash(const struct tcf_proto *tp) | |
339 | { | |
d18b4b35 | 340 | return hash_ptr(tp->chain->block, U32_HASH_SHIFT); |
3cd904ec WC |
341 | } |
342 | ||
343 | static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp) | |
344 | { | |
345 | struct tc_u_common *tc; | |
346 | unsigned int h; | |
347 | ||
348 | h = tc_u_hash(tp); | |
349 | hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) { | |
7fa9d974 | 350 | if (tc->block == tp->chain->block) |
3cd904ec WC |
351 | return tc; |
352 | } | |
353 | return NULL; | |
354 | } | |
355 | ||
1da177e4 LT |
356 | static int u32_init(struct tcf_proto *tp) |
357 | { | |
358 | struct tc_u_hnode *root_ht; | |
359 | struct tc_u_common *tp_c; | |
3cd904ec | 360 | unsigned int h; |
1da177e4 | 361 | |
3cd904ec | 362 | tp_c = tc_u_common_find(tp); |
1da177e4 | 363 | |
0da974f4 | 364 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
365 | if (root_ht == NULL) |
366 | return -ENOBUFS; | |
367 | ||
1da177e4 | 368 | root_ht->refcnt++; |
e7614370 | 369 | root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000; |
1da177e4 | 370 | root_ht->prio = tp->prio; |
e7614370 | 371 | idr_init(&root_ht->handle_idr); |
1da177e4 LT |
372 | |
373 | if (tp_c == NULL) { | |
0da974f4 | 374 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
375 | if (tp_c == NULL) { |
376 | kfree(root_ht); | |
377 | return -ENOBUFS; | |
378 | } | |
7fa9d974 | 379 | tp_c->block = tp->chain->block; |
3cd904ec | 380 | INIT_HLIST_NODE(&tp_c->hnode); |
e7614370 | 381 | idr_init(&tp_c->handle_idr); |
3cd904ec WC |
382 | |
383 | h = tc_u_hash(tp); | |
384 | hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]); | |
1da177e4 LT |
385 | } |
386 | ||
387 | tp_c->refcnt++; | |
1ce87720 JF |
388 | RCU_INIT_POINTER(root_ht->next, tp_c->hlist); |
389 | rcu_assign_pointer(tp_c->hlist, root_ht); | |
1da177e4 LT |
390 | root_ht->tp_c = tp_c; |
391 | ||
1ce87720 | 392 | rcu_assign_pointer(tp->root, root_ht); |
1da177e4 LT |
393 | tp->data = tp_c; |
394 | return 0; | |
395 | } | |
396 | ||
5a7a5555 | 397 | static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n, |
de5df632 | 398 | bool free_pf) |
1da177e4 | 399 | { |
360a6fdd PA |
400 | struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); |
401 | ||
18d0264f | 402 | tcf_exts_destroy(&n->exts); |
35c55fc1 | 403 | tcf_exts_put_net(&n->exts); |
360a6fdd PA |
404 | if (ht && --ht->refcnt == 0) |
405 | kfree(ht); | |
1da177e4 | 406 | #ifdef CONFIG_CLS_U32_PERF |
de5df632 JF |
407 | if (free_pf) |
408 | free_percpu(n->pf); | |
a1ddcfee JF |
409 | #endif |
410 | #ifdef CONFIG_CLS_U32_MARK | |
de5df632 JF |
411 | if (free_pf) |
412 | free_percpu(n->pcpu_success); | |
1da177e4 LT |
413 | #endif |
414 | kfree(n); | |
415 | return 0; | |
416 | } | |
417 | ||
de5df632 JF |
418 | /* u32_delete_key_rcu should be called when free'ing a copied |
419 | * version of a tc_u_knode obtained from u32_init_knode(). When | |
420 | * copies are obtained from u32_init_knode() the statistics are | |
421 | * shared between the old and new copies to allow readers to | |
422 | * continue to update the statistics during the copy. To support | |
423 | * this the u32_delete_key_rcu variant does not free the percpu | |
424 | * statistics. | |
425 | */ | |
c0d378ef CW |
426 | static void u32_delete_key_work(struct work_struct *work) |
427 | { | |
428 | struct tc_u_knode *key = container_of(work, struct tc_u_knode, work); | |
429 | ||
430 | rtnl_lock(); | |
431 | u32_destroy_key(key->tp, key, false); | |
432 | rtnl_unlock(); | |
433 | } | |
434 | ||
1ce87720 JF |
435 | static void u32_delete_key_rcu(struct rcu_head *rcu) |
436 | { | |
437 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
438 | ||
c0d378ef CW |
439 | INIT_WORK(&key->work, u32_delete_key_work); |
440 | tcf_queue_work(&key->work); | |
de5df632 JF |
441 | } |
442 | ||
443 | /* u32_delete_key_freepf_rcu is the rcu callback variant | |
444 | * that free's the entire structure including the statistics | |
445 | * percpu variables. Only use this if the key is not a copy | |
446 | * returned by u32_init_knode(). See u32_delete_key_rcu() | |
447 | * for the variant that should be used with keys return from | |
448 | * u32_init_knode() | |
449 | */ | |
c0d378ef CW |
450 | static void u32_delete_key_freepf_work(struct work_struct *work) |
451 | { | |
452 | struct tc_u_knode *key = container_of(work, struct tc_u_knode, work); | |
453 | ||
454 | rtnl_lock(); | |
455 | u32_destroy_key(key->tp, key, true); | |
456 | rtnl_unlock(); | |
457 | } | |
458 | ||
de5df632 JF |
459 | static void u32_delete_key_freepf_rcu(struct rcu_head *rcu) |
460 | { | |
461 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
462 | ||
c0d378ef CW |
463 | INIT_WORK(&key->work, u32_delete_key_freepf_work); |
464 | tcf_queue_work(&key->work); | |
1ce87720 JF |
465 | } |
466 | ||
82d567c2 | 467 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) |
1da177e4 | 468 | { |
1ce87720 JF |
469 | struct tc_u_knode __rcu **kp; |
470 | struct tc_u_knode *pkp; | |
a96366bf | 471 | struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); |
1da177e4 LT |
472 | |
473 | if (ht) { | |
1ce87720 JF |
474 | kp = &ht->ht[TC_U32_HASH(key->handle)]; |
475 | for (pkp = rtnl_dereference(*kp); pkp; | |
476 | kp = &pkp->next, pkp = rtnl_dereference(*kp)) { | |
477 | if (pkp == key) { | |
478 | RCU_INIT_POINTER(*kp, key->next); | |
1da177e4 | 479 | |
a0efb80c | 480 | tcf_unbind_filter(tp, &key->res); |
cf0a9345 | 481 | idr_remove(&ht->handle_idr, key->handle); |
35c55fc1 | 482 | tcf_exts_get_net(&key->exts); |
de5df632 | 483 | call_rcu(&key->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
484 | return 0; |
485 | } | |
486 | } | |
487 | } | |
547b792c | 488 | WARN_ON(1); |
1da177e4 LT |
489 | return 0; |
490 | } | |
491 | ||
77460411 | 492 | static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h) |
a1b7c5fd | 493 | { |
245dc512 | 494 | struct tcf_block *block = tp->chain->block; |
de4784ca | 495 | struct tc_cls_u32_offload cls_u32 = {}; |
a1b7c5fd | 496 | |
de4784ca | 497 | tc_cls_common_offload_init(&cls_u32.common, tp); |
77460411 JP |
498 | cls_u32.command = TC_CLSU32_DELETE_HNODE; |
499 | cls_u32.hnode.divisor = h->divisor; | |
500 | cls_u32.hnode.handle = h->handle; | |
501 | cls_u32.hnode.prio = h->prio; | |
de4784ca | 502 | |
245dc512 | 503 | tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false); |
a1b7c5fd JF |
504 | } |
505 | ||
5a7a5555 JHS |
506 | static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h, |
507 | u32 flags) | |
a1b7c5fd | 508 | { |
245dc512 | 509 | struct tcf_block *block = tp->chain->block; |
de4784ca | 510 | struct tc_cls_u32_offload cls_u32 = {}; |
245dc512 JP |
511 | bool skip_sw = tc_skip_sw(flags); |
512 | bool offloaded = false; | |
d34e3e18 | 513 | int err; |
a1b7c5fd | 514 | |
de4784ca JP |
515 | tc_cls_common_offload_init(&cls_u32.common, tp); |
516 | cls_u32.command = TC_CLSU32_NEW_HNODE; | |
517 | cls_u32.hnode.divisor = h->divisor; | |
518 | cls_u32.hnode.handle = h->handle; | |
519 | cls_u32.hnode.prio = h->prio; | |
a1b7c5fd | 520 | |
245dc512 JP |
521 | err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw); |
522 | if (err < 0) { | |
523 | u32_clear_hw_hnode(tp, h); | |
d47a0f38 | 524 | return err; |
245dc512 JP |
525 | } else if (err > 0) { |
526 | offloaded = true; | |
527 | } | |
528 | ||
529 | if (skip_sw && !offloaded) | |
530 | return -EINVAL; | |
d34e3e18 SS |
531 | |
532 | return 0; | |
a1b7c5fd JF |
533 | } |
534 | ||
77460411 | 535 | static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle) |
a1b7c5fd | 536 | { |
245dc512 | 537 | struct tcf_block *block = tp->chain->block; |
de4784ca | 538 | struct tc_cls_u32_offload cls_u32 = {}; |
a1b7c5fd | 539 | |
de4784ca | 540 | tc_cls_common_offload_init(&cls_u32.common, tp); |
77460411 JP |
541 | cls_u32.command = TC_CLSU32_DELETE_KNODE; |
542 | cls_u32.knode.handle = handle; | |
a1b7c5fd | 543 | |
245dc512 | 544 | tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false); |
a1b7c5fd JF |
545 | } |
546 | ||
5a7a5555 JHS |
547 | static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, |
548 | u32 flags) | |
a1b7c5fd | 549 | { |
b49f9c88 | 550 | struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); |
245dc512 | 551 | struct tcf_block *block = tp->chain->block; |
de4784ca | 552 | struct tc_cls_u32_offload cls_u32 = {}; |
245dc512 | 553 | bool skip_sw = tc_skip_sw(flags); |
d34e3e18 | 554 | int err; |
a1b7c5fd | 555 | |
de4784ca JP |
556 | tc_cls_common_offload_init(&cls_u32.common, tp); |
557 | cls_u32.command = TC_CLSU32_REPLACE_KNODE; | |
558 | cls_u32.knode.handle = n->handle; | |
559 | cls_u32.knode.fshift = n->fshift; | |
a1b7c5fd | 560 | #ifdef CONFIG_CLS_U32_MARK |
de4784ca JP |
561 | cls_u32.knode.val = n->val; |
562 | cls_u32.knode.mask = n->mask; | |
a1b7c5fd | 563 | #else |
de4784ca JP |
564 | cls_u32.knode.val = 0; |
565 | cls_u32.knode.mask = 0; | |
a1b7c5fd | 566 | #endif |
de4784ca JP |
567 | cls_u32.knode.sel = &n->sel; |
568 | cls_u32.knode.exts = &n->exts; | |
201c44bd | 569 | if (n->ht_down) |
b49f9c88 | 570 | cls_u32.knode.link_handle = ht->handle; |
201c44bd | 571 | |
245dc512 JP |
572 | err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw); |
573 | if (err < 0) { | |
574 | u32_remove_hw_knode(tp, n->handle); | |
201c44bd | 575 | return err; |
245dc512 JP |
576 | } else if (err > 0) { |
577 | n->flags |= TCA_CLS_FLAGS_IN_HW; | |
578 | } | |
579 | ||
0f04d057 | 580 | if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW)) |
245dc512 | 581 | return -EINVAL; |
d34e3e18 SS |
582 | |
583 | return 0; | |
a1b7c5fd JF |
584 | } |
585 | ||
a0efb80c | 586 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) |
1da177e4 LT |
587 | { |
588 | struct tc_u_knode *n; | |
cc7ec456 | 589 | unsigned int h; |
1da177e4 | 590 | |
cc7ec456 | 591 | for (h = 0; h <= ht->divisor; h++) { |
1ce87720 JF |
592 | while ((n = rtnl_dereference(ht->ht[h])) != NULL) { |
593 | RCU_INIT_POINTER(ht->ht[h], | |
594 | rtnl_dereference(n->next)); | |
a0efb80c | 595 | tcf_unbind_filter(tp, &n->res); |
a1b7c5fd | 596 | u32_remove_hw_knode(tp, n->handle); |
e7614370 | 597 | idr_remove_ext(&ht->handle_idr, n->handle); |
35c55fc1 CW |
598 | if (tcf_exts_get_net(&n->exts)) |
599 | call_rcu(&n->rcu, u32_delete_key_freepf_rcu); | |
600 | else | |
601 | u32_destroy_key(n->tp, n, true); | |
1da177e4 LT |
602 | } |
603 | } | |
604 | } | |
605 | ||
606 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
607 | { | |
608 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 JF |
609 | struct tc_u_hnode __rcu **hn; |
610 | struct tc_u_hnode *phn; | |
1da177e4 | 611 | |
547b792c | 612 | WARN_ON(ht->refcnt); |
1da177e4 | 613 | |
a0efb80c | 614 | u32_clear_hnode(tp, ht); |
1da177e4 | 615 | |
1ce87720 JF |
616 | hn = &tp_c->hlist; |
617 | for (phn = rtnl_dereference(*hn); | |
618 | phn; | |
619 | hn = &phn->next, phn = rtnl_dereference(*hn)) { | |
620 | if (phn == ht) { | |
a1b7c5fd | 621 | u32_clear_hw_hnode(tp, ht); |
e7614370 CW |
622 | idr_destroy(&ht->handle_idr); |
623 | idr_remove_ext(&tp_c->handle_idr, ht->handle); | |
1ce87720 JF |
624 | RCU_INIT_POINTER(*hn, ht->next); |
625 | kfree_rcu(ht, rcu); | |
1da177e4 LT |
626 | return 0; |
627 | } | |
628 | } | |
629 | ||
1da177e4 LT |
630 | return -ENOENT; |
631 | } | |
632 | ||
1e052be6 CW |
633 | static bool ht_empty(struct tc_u_hnode *ht) |
634 | { | |
635 | unsigned int h; | |
636 | ||
637 | for (h = 0; h <= ht->divisor; h++) | |
638 | if (rcu_access_pointer(ht->ht[h])) | |
639 | return false; | |
640 | ||
641 | return true; | |
642 | } | |
643 | ||
763dbf63 | 644 | static void u32_destroy(struct tcf_proto *tp) |
1da177e4 LT |
645 | { |
646 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 | 647 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 | 648 | |
547b792c | 649 | WARN_ON(root_ht == NULL); |
1da177e4 LT |
650 | |
651 | if (root_ht && --root_ht->refcnt == 0) | |
652 | u32_destroy_hnode(tp, root_ht); | |
653 | ||
654 | if (--tp_c->refcnt == 0) { | |
655 | struct tc_u_hnode *ht; | |
1da177e4 | 656 | |
3cd904ec | 657 | hlist_del(&tp_c->hnode); |
1da177e4 | 658 | |
1ce87720 | 659 | while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) { |
360a6fdd | 660 | u32_clear_hnode(tp, ht); |
1ce87720 | 661 | RCU_INIT_POINTER(tp_c->hlist, ht->next); |
360a6fdd PA |
662 | |
663 | /* u32_destroy_key() will later free ht for us, if it's | |
664 | * still referenced by some knode | |
665 | */ | |
666 | if (--ht->refcnt == 0) | |
667 | kfree_rcu(ht, rcu); | |
3ff50b79 | 668 | } |
1da177e4 | 669 | |
e7614370 | 670 | idr_destroy(&tp_c->handle_idr); |
1da177e4 LT |
671 | kfree(tp_c); |
672 | } | |
673 | ||
674 | tp->data = NULL; | |
675 | } | |
676 | ||
8113c095 | 677 | static int u32_delete(struct tcf_proto *tp, void *arg, bool *last) |
1da177e4 | 678 | { |
8113c095 | 679 | struct tc_u_hnode *ht = arg; |
1ce87720 | 680 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
763dbf63 WC |
681 | struct tc_u_common *tp_c = tp->data; |
682 | int ret = 0; | |
1da177e4 LT |
683 | |
684 | if (ht == NULL) | |
763dbf63 | 685 | goto out; |
1da177e4 | 686 | |
a1b7c5fd JF |
687 | if (TC_U32_KEY(ht->handle)) { |
688 | u32_remove_hw_knode(tp, ht->handle); | |
763dbf63 WC |
689 | ret = u32_delete_key(tp, (struct tc_u_knode *)ht); |
690 | goto out; | |
a1b7c5fd | 691 | } |
1da177e4 | 692 | |
1ce87720 | 693 | if (root_ht == ht) |
1da177e4 LT |
694 | return -EINVAL; |
695 | ||
e56cfad1 JP |
696 | if (ht->refcnt == 1) { |
697 | ht->refcnt--; | |
1da177e4 | 698 | u32_destroy_hnode(tp, ht); |
e56cfad1 JP |
699 | } else { |
700 | return -EBUSY; | |
701 | } | |
1da177e4 | 702 | |
763dbf63 WC |
703 | out: |
704 | *last = true; | |
705 | if (root_ht) { | |
706 | if (root_ht->refcnt > 1) { | |
707 | *last = false; | |
708 | goto ret; | |
709 | } | |
710 | if (root_ht->refcnt == 1) { | |
711 | if (!ht_empty(root_ht)) { | |
712 | *last = false; | |
713 | goto ret; | |
714 | } | |
715 | } | |
716 | } | |
717 | ||
718 | if (tp_c->refcnt > 1) { | |
719 | *last = false; | |
720 | goto ret; | |
721 | } | |
722 | ||
723 | if (tp_c->refcnt == 1) { | |
724 | struct tc_u_hnode *ht; | |
725 | ||
726 | for (ht = rtnl_dereference(tp_c->hlist); | |
727 | ht; | |
728 | ht = rtnl_dereference(ht->next)) | |
729 | if (!ht_empty(ht)) { | |
730 | *last = false; | |
731 | break; | |
732 | } | |
733 | } | |
734 | ||
735 | ret: | |
736 | return ret; | |
1da177e4 LT |
737 | } |
738 | ||
e7614370 | 739 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid) |
1da177e4 | 740 | { |
e7614370 CW |
741 | unsigned long idr_index; |
742 | u32 start = htid | 0x800; | |
743 | u32 max = htid | 0xFFF; | |
744 | u32 min = htid; | |
745 | ||
746 | if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index, | |
747 | start, max + 1, GFP_KERNEL)) { | |
748 | if (idr_alloc_ext(&ht->handle_idr, NULL, &idr_index, | |
749 | min + 1, max + 1, GFP_KERNEL)) | |
750 | return max; | |
751 | } | |
7801db8a | 752 | |
e7614370 | 753 | return (u32)idr_index; |
1da177e4 LT |
754 | } |
755 | ||
6fa8c014 PM |
756 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
757 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
758 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
759 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
760 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
761 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
762 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
763 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
9e8ce79c | 764 | [TCA_U32_FLAGS] = { .type = NLA_U32 }, |
6fa8c014 PM |
765 | }; |
766 | ||
c1b52739 BL |
767 | static int u32_set_parms(struct net *net, struct tcf_proto *tp, |
768 | unsigned long base, struct tc_u_hnode *ht, | |
add93b61 | 769 | struct tc_u_knode *n, struct nlattr **tb, |
2f7ef2f8 | 770 | struct nlattr *est, bool ovr) |
1da177e4 | 771 | { |
b9a24bb7 | 772 | int err; |
1da177e4 | 773 | |
705c7091 | 774 | err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr); |
1da177e4 LT |
775 | if (err < 0) |
776 | return err; | |
777 | ||
add93b61 | 778 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 779 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 780 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 LT |
781 | |
782 | if (TC_U32_KEY(handle)) | |
705c7091 | 783 | return -EINVAL; |
1da177e4 LT |
784 | |
785 | if (handle) { | |
786 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
787 | ||
788 | if (ht_down == NULL) | |
705c7091 | 789 | return -EINVAL; |
1da177e4 LT |
790 | ht_down->refcnt++; |
791 | } | |
792 | ||
1ce87720 JF |
793 | ht_old = rtnl_dereference(n->ht_down); |
794 | rcu_assign_pointer(n->ht_down, ht_down); | |
1da177e4 | 795 | |
47a1a1d4 PM |
796 | if (ht_old) |
797 | ht_old->refcnt--; | |
1da177e4 | 798 | } |
add93b61 | 799 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 800 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
801 | tcf_bind_filter(tp, &n->res, base); |
802 | } | |
803 | ||
804 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 805 | if (tb[TCA_U32_INDEV]) { |
2519a602 WC |
806 | int ret; |
807 | ret = tcf_change_indev(net, tb[TCA_U32_INDEV]); | |
808 | if (ret < 0) | |
705c7091 | 809 | return -EINVAL; |
2519a602 | 810 | n->ifindex = ret; |
1da177e4 LT |
811 | } |
812 | #endif | |
1da177e4 | 813 | return 0; |
1da177e4 LT |
814 | } |
815 | ||
5a7a5555 | 816 | static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c, |
de5df632 JF |
817 | struct tc_u_knode *n) |
818 | { | |
819 | struct tc_u_knode __rcu **ins; | |
820 | struct tc_u_knode *pins; | |
821 | struct tc_u_hnode *ht; | |
822 | ||
823 | if (TC_U32_HTID(n->handle) == TC_U32_ROOT) | |
824 | ht = rtnl_dereference(tp->root); | |
825 | else | |
826 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle)); | |
827 | ||
828 | ins = &ht->ht[TC_U32_HASH(n->handle)]; | |
829 | ||
830 | /* The node must always exist for it to be replaced if this is not the | |
831 | * case then something went very wrong elsewhere. | |
832 | */ | |
833 | for (pins = rtnl_dereference(*ins); ; | |
834 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
835 | if (pins->handle == n->handle) | |
836 | break; | |
837 | ||
e7614370 | 838 | idr_replace_ext(&ht->handle_idr, n, n->handle); |
de5df632 JF |
839 | RCU_INIT_POINTER(n->next, pins->next); |
840 | rcu_assign_pointer(*ins, n); | |
841 | } | |
842 | ||
843 | static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp, | |
844 | struct tc_u_knode *n) | |
845 | { | |
b49f9c88 | 846 | struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); |
de5df632 | 847 | struct tc_u32_sel *s = &n->sel; |
b49f9c88 | 848 | struct tc_u_knode *new; |
de5df632 JF |
849 | |
850 | new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), | |
851 | GFP_KERNEL); | |
852 | ||
853 | if (!new) | |
854 | return NULL; | |
855 | ||
856 | RCU_INIT_POINTER(new->next, n->next); | |
857 | new->handle = n->handle; | |
858 | RCU_INIT_POINTER(new->ht_up, n->ht_up); | |
859 | ||
860 | #ifdef CONFIG_NET_CLS_IND | |
861 | new->ifindex = n->ifindex; | |
862 | #endif | |
863 | new->fshift = n->fshift; | |
864 | new->res = n->res; | |
9e8ce79c | 865 | new->flags = n->flags; |
b49f9c88 | 866 | RCU_INIT_POINTER(new->ht_down, ht); |
de5df632 JF |
867 | |
868 | /* bump reference count as long as we hold pointer to structure */ | |
b49f9c88 PA |
869 | if (ht) |
870 | ht->refcnt++; | |
de5df632 JF |
871 | |
872 | #ifdef CONFIG_CLS_U32_PERF | |
873 | /* Statistics may be incremented by readers during update | |
874 | * so we must keep them in tact. When the node is later destroyed | |
875 | * a special destroy call must be made to not free the pf memory. | |
876 | */ | |
877 | new->pf = n->pf; | |
878 | #endif | |
879 | ||
880 | #ifdef CONFIG_CLS_U32_MARK | |
881 | new->val = n->val; | |
882 | new->mask = n->mask; | |
883 | /* Similarly success statistics must be moved as pointers */ | |
884 | new->pcpu_success = n->pcpu_success; | |
885 | #endif | |
886 | new->tp = tp; | |
887 | memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
888 | ||
b9a24bb7 WC |
889 | if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) { |
890 | kfree(new); | |
891 | return NULL; | |
892 | } | |
de5df632 JF |
893 | |
894 | return new; | |
895 | } | |
896 | ||
c1b52739 | 897 | static int u32_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 898 | struct tcf_proto *tp, unsigned long base, u32 handle, |
8113c095 | 899 | struct nlattr **tca, void **arg, bool ovr) |
1da177e4 LT |
900 | { |
901 | struct tc_u_common *tp_c = tp->data; | |
902 | struct tc_u_hnode *ht; | |
903 | struct tc_u_knode *n; | |
904 | struct tc_u32_sel *s; | |
add93b61 PM |
905 | struct nlattr *opt = tca[TCA_OPTIONS]; |
906 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
9e8ce79c | 907 | u32 htid, flags = 0; |
1da177e4 | 908 | int err; |
459d5f62 JF |
909 | #ifdef CONFIG_CLS_U32_PERF |
910 | size_t size; | |
911 | #endif | |
1da177e4 LT |
912 | |
913 | if (opt == NULL) | |
914 | return handle ? -EINVAL : 0; | |
915 | ||
fceb6435 | 916 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, NULL); |
cee63723 PM |
917 | if (err < 0) |
918 | return err; | |
1da177e4 | 919 | |
d34e3e18 | 920 | if (tb[TCA_U32_FLAGS]) { |
9e8ce79c | 921 | flags = nla_get_u32(tb[TCA_U32_FLAGS]); |
d34e3e18 | 922 | if (!tc_flags_valid(flags)) |
1a0f7d29 | 923 | return -EINVAL; |
d34e3e18 | 924 | } |
9e8ce79c | 925 | |
8113c095 | 926 | n = *arg; |
cc7ec456 | 927 | if (n) { |
de5df632 JF |
928 | struct tc_u_knode *new; |
929 | ||
1da177e4 LT |
930 | if (TC_U32_KEY(n->handle) == 0) |
931 | return -EINVAL; | |
932 | ||
2d965923 IV |
933 | if ((n->flags ^ flags) & |
934 | ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) | |
9e8ce79c JF |
935 | return -EINVAL; |
936 | ||
de5df632 JF |
937 | new = u32_init_knode(tp, n); |
938 | if (!new) | |
939 | return -ENOMEM; | |
940 | ||
941 | err = u32_set_parms(net, tp, base, | |
942 | rtnl_dereference(n->ht_up), new, tb, | |
943 | tca[TCA_RATE], ovr); | |
944 | ||
945 | if (err) { | |
946 | u32_destroy_key(tp, new, false); | |
947 | return err; | |
948 | } | |
949 | ||
d34e3e18 SS |
950 | err = u32_replace_hw_knode(tp, new, flags); |
951 | if (err) { | |
952 | u32_destroy_key(tp, new, false); | |
953 | return err; | |
954 | } | |
955 | ||
24d3dc6d OG |
956 | if (!tc_in_hw(new->flags)) |
957 | new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
958 | ||
de5df632 | 959 | u32_replace_knode(tp, tp_c, new); |
a0efb80c | 960 | tcf_unbind_filter(tp, &n->res); |
35c55fc1 | 961 | tcf_exts_get_net(&n->exts); |
de5df632 JF |
962 | call_rcu(&n->rcu, u32_delete_key_rcu); |
963 | return 0; | |
1da177e4 LT |
964 | } |
965 | ||
add93b61 | 966 | if (tb[TCA_U32_DIVISOR]) { |
cc7ec456 | 967 | unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); |
1da177e4 LT |
968 | |
969 | if (--divisor > 0x100) | |
970 | return -EINVAL; | |
971 | if (TC_U32_KEY(handle)) | |
972 | return -EINVAL; | |
cc7ec456 | 973 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); |
1da177e4 LT |
974 | if (ht == NULL) |
975 | return -ENOBUFS; | |
e7614370 CW |
976 | if (handle == 0) { |
977 | handle = gen_new_htid(tp->data, ht); | |
978 | if (handle == 0) { | |
979 | kfree(ht); | |
980 | return -ENOMEM; | |
981 | } | |
982 | } else { | |
983 | err = idr_alloc_ext(&tp_c->handle_idr, ht, NULL, | |
984 | handle, handle + 1, GFP_KERNEL); | |
985 | if (err) { | |
986 | kfree(ht); | |
987 | return err; | |
988 | } | |
989 | } | |
1da177e4 | 990 | ht->tp_c = tp_c; |
e56cfad1 | 991 | ht->refcnt = 1; |
1da177e4 LT |
992 | ht->divisor = divisor; |
993 | ht->handle = handle; | |
994 | ht->prio = tp->prio; | |
e7614370 | 995 | idr_init(&ht->handle_idr); |
6eef3801 JK |
996 | |
997 | err = u32_replace_hw_hnode(tp, ht, flags); | |
998 | if (err) { | |
e7614370 | 999 | idr_remove_ext(&tp_c->handle_idr, handle); |
6eef3801 JK |
1000 | kfree(ht); |
1001 | return err; | |
1002 | } | |
1003 | ||
1ce87720 JF |
1004 | RCU_INIT_POINTER(ht->next, tp_c->hlist); |
1005 | rcu_assign_pointer(tp_c->hlist, ht); | |
8113c095 | 1006 | *arg = ht; |
a1b7c5fd | 1007 | |
1da177e4 LT |
1008 | return 0; |
1009 | } | |
1010 | ||
add93b61 | 1011 | if (tb[TCA_U32_HASH]) { |
1587bac4 | 1012 | htid = nla_get_u32(tb[TCA_U32_HASH]); |
1da177e4 | 1013 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
1ce87720 | 1014 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
1015 | htid = ht->handle; |
1016 | } else { | |
1017 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
1018 | if (ht == NULL) | |
1019 | return -EINVAL; | |
1020 | } | |
1021 | } else { | |
1ce87720 | 1022 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
1023 | htid = ht->handle; |
1024 | } | |
1025 | ||
1026 | if (ht->divisor < TC_U32_HASH(htid)) | |
1027 | return -EINVAL; | |
1028 | ||
1029 | if (handle) { | |
1030 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
1031 | return -EINVAL; | |
1032 | handle = htid | TC_U32_NODE(handle); | |
e7614370 CW |
1033 | err = idr_alloc_ext(&ht->handle_idr, NULL, NULL, |
1034 | handle, handle + 1, | |
1035 | GFP_KERNEL); | |
1036 | if (err) | |
1037 | return err; | |
1da177e4 LT |
1038 | } else |
1039 | handle = gen_new_kid(ht, htid); | |
1040 | ||
e7614370 CW |
1041 | if (tb[TCA_U32_SEL] == NULL) { |
1042 | err = -EINVAL; | |
1043 | goto erridr; | |
1044 | } | |
1da177e4 | 1045 | |
add93b61 | 1046 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 1047 | |
0da974f4 | 1048 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
e7614370 CW |
1049 | if (n == NULL) { |
1050 | err = -ENOBUFS; | |
1051 | goto erridr; | |
1052 | } | |
1da177e4 | 1053 | |
1da177e4 | 1054 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 JF |
1055 | size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64); |
1056 | n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt)); | |
1057 | if (!n->pf) { | |
e7614370 CW |
1058 | err = -ENOBUFS; |
1059 | goto errfree; | |
1da177e4 | 1060 | } |
1da177e4 LT |
1061 | #endif |
1062 | ||
1063 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
a96366bf | 1064 | RCU_INIT_POINTER(n->ht_up, ht); |
1da177e4 | 1065 | n->handle = handle; |
b2268016 | 1066 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
9e8ce79c | 1067 | n->flags = flags; |
1ce87720 | 1068 | n->tp = tp; |
1da177e4 | 1069 | |
b9a24bb7 WC |
1070 | err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE); |
1071 | if (err < 0) | |
1072 | goto errout; | |
1073 | ||
1da177e4 | 1074 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 | 1075 | n->pcpu_success = alloc_percpu(u32); |
a1ddcfee JF |
1076 | if (!n->pcpu_success) { |
1077 | err = -ENOMEM; | |
1078 | goto errout; | |
1079 | } | |
459d5f62 | 1080 | |
add93b61 | 1081 | if (tb[TCA_U32_MARK]) { |
1da177e4 LT |
1082 | struct tc_u32_mark *mark; |
1083 | ||
add93b61 | 1084 | mark = nla_data(tb[TCA_U32_MARK]); |
459d5f62 JF |
1085 | n->val = mark->val; |
1086 | n->mask = mark->mask; | |
1da177e4 LT |
1087 | } |
1088 | #endif | |
1089 | ||
2f7ef2f8 | 1090 | err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr); |
1da177e4 | 1091 | if (err == 0) { |
1ce87720 JF |
1092 | struct tc_u_knode __rcu **ins; |
1093 | struct tc_u_knode *pins; | |
1094 | ||
d34e3e18 SS |
1095 | err = u32_replace_hw_knode(tp, n, flags); |
1096 | if (err) | |
1097 | goto errhw; | |
1098 | ||
24d3dc6d OG |
1099 | if (!tc_in_hw(n->flags)) |
1100 | n->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
1101 | ||
1ce87720 JF |
1102 | ins = &ht->ht[TC_U32_HASH(handle)]; |
1103 | for (pins = rtnl_dereference(*ins); pins; | |
1104 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
1105 | if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle)) | |
1da177e4 LT |
1106 | break; |
1107 | ||
1ce87720 JF |
1108 | RCU_INIT_POINTER(n->next, pins); |
1109 | rcu_assign_pointer(*ins, n); | |
8113c095 | 1110 | *arg = n; |
1da177e4 LT |
1111 | return 0; |
1112 | } | |
a1ddcfee | 1113 | |
d34e3e18 | 1114 | errhw: |
a1ddcfee JF |
1115 | #ifdef CONFIG_CLS_U32_MARK |
1116 | free_percpu(n->pcpu_success); | |
1117 | #endif | |
1118 | ||
b9a24bb7 WC |
1119 | errout: |
1120 | tcf_exts_destroy(&n->exts); | |
1da177e4 | 1121 | #ifdef CONFIG_CLS_U32_PERF |
e7614370 | 1122 | errfree: |
1ce87720 | 1123 | free_percpu(n->pf); |
1da177e4 LT |
1124 | #endif |
1125 | kfree(n); | |
e7614370 CW |
1126 | erridr: |
1127 | idr_remove_ext(&ht->handle_idr, handle); | |
1da177e4 LT |
1128 | return err; |
1129 | } | |
1130 | ||
1131 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
1132 | { | |
1133 | struct tc_u_common *tp_c = tp->data; | |
1134 | struct tc_u_hnode *ht; | |
1135 | struct tc_u_knode *n; | |
cc7ec456 | 1136 | unsigned int h; |
1da177e4 LT |
1137 | |
1138 | if (arg->stop) | |
1139 | return; | |
1140 | ||
1ce87720 JF |
1141 | for (ht = rtnl_dereference(tp_c->hlist); |
1142 | ht; | |
1143 | ht = rtnl_dereference(ht->next)) { | |
1da177e4 LT |
1144 | if (ht->prio != tp->prio) |
1145 | continue; | |
1146 | if (arg->count >= arg->skip) { | |
8113c095 | 1147 | if (arg->fn(tp, ht, arg) < 0) { |
1da177e4 LT |
1148 | arg->stop = 1; |
1149 | return; | |
1150 | } | |
1151 | } | |
1152 | arg->count++; | |
1153 | for (h = 0; h <= ht->divisor; h++) { | |
1ce87720 JF |
1154 | for (n = rtnl_dereference(ht->ht[h]); |
1155 | n; | |
1156 | n = rtnl_dereference(n->next)) { | |
1da177e4 LT |
1157 | if (arg->count < arg->skip) { |
1158 | arg->count++; | |
1159 | continue; | |
1160 | } | |
8113c095 | 1161 | if (arg->fn(tp, n, arg) < 0) { |
1da177e4 LT |
1162 | arg->stop = 1; |
1163 | return; | |
1164 | } | |
1165 | arg->count++; | |
1166 | } | |
1167 | } | |
1168 | } | |
1169 | } | |
1170 | ||
07d79fc7 CW |
1171 | static void u32_bind_class(void *fh, u32 classid, unsigned long cl) |
1172 | { | |
1173 | struct tc_u_knode *n = fh; | |
1174 | ||
1175 | if (n && n->res.classid == classid) | |
1176 | n->res.class = cl; | |
1177 | } | |
1178 | ||
8113c095 | 1179 | static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh, |
5a7a5555 | 1180 | struct sk_buff *skb, struct tcmsg *t) |
1da177e4 | 1181 | { |
8113c095 | 1182 | struct tc_u_knode *n = fh; |
1ce87720 | 1183 | struct tc_u_hnode *ht_up, *ht_down; |
4b3550ef | 1184 | struct nlattr *nest; |
1da177e4 LT |
1185 | |
1186 | if (n == NULL) | |
1187 | return skb->len; | |
1188 | ||
1189 | t->tcm_handle = n->handle; | |
1190 | ||
4b3550ef PM |
1191 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1192 | if (nest == NULL) | |
1193 | goto nla_put_failure; | |
1da177e4 LT |
1194 | |
1195 | if (TC_U32_KEY(n->handle) == 0) { | |
8113c095 | 1196 | struct tc_u_hnode *ht = fh; |
cc7ec456 ED |
1197 | u32 divisor = ht->divisor + 1; |
1198 | ||
1b34ec43 DM |
1199 | if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) |
1200 | goto nla_put_failure; | |
1da177e4 | 1201 | } else { |
459d5f62 JF |
1202 | #ifdef CONFIG_CLS_U32_PERF |
1203 | struct tc_u32_pcnt *gpf; | |
459d5f62 | 1204 | int cpu; |
80aab73d | 1205 | #endif |
459d5f62 | 1206 | |
1b34ec43 DM |
1207 | if (nla_put(skb, TCA_U32_SEL, |
1208 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
1209 | &n->sel)) | |
1210 | goto nla_put_failure; | |
1ce87720 JF |
1211 | |
1212 | ht_up = rtnl_dereference(n->ht_up); | |
1213 | if (ht_up) { | |
1da177e4 | 1214 | u32 htid = n->handle & 0xFFFFF000; |
1b34ec43 DM |
1215 | if (nla_put_u32(skb, TCA_U32_HASH, htid)) |
1216 | goto nla_put_failure; | |
1da177e4 | 1217 | } |
1b34ec43 DM |
1218 | if (n->res.classid && |
1219 | nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) | |
1220 | goto nla_put_failure; | |
1ce87720 JF |
1221 | |
1222 | ht_down = rtnl_dereference(n->ht_down); | |
1223 | if (ht_down && | |
1224 | nla_put_u32(skb, TCA_U32_LINK, ht_down->handle)) | |
1b34ec43 | 1225 | goto nla_put_failure; |
1da177e4 | 1226 | |
9e8ce79c JF |
1227 | if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags)) |
1228 | goto nla_put_failure; | |
1229 | ||
1da177e4 | 1230 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 JF |
1231 | if ((n->val || n->mask)) { |
1232 | struct tc_u32_mark mark = {.val = n->val, | |
1233 | .mask = n->mask, | |
1234 | .success = 0}; | |
80aab73d | 1235 | int cpum; |
459d5f62 | 1236 | |
80aab73d JF |
1237 | for_each_possible_cpu(cpum) { |
1238 | __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum); | |
459d5f62 JF |
1239 | |
1240 | mark.success += cnt; | |
1241 | } | |
1242 | ||
1243 | if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark)) | |
1244 | goto nla_put_failure; | |
1245 | } | |
1da177e4 LT |
1246 | #endif |
1247 | ||
5da57f42 | 1248 | if (tcf_exts_dump(skb, &n->exts) < 0) |
add93b61 | 1249 | goto nla_put_failure; |
1da177e4 LT |
1250 | |
1251 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 WC |
1252 | if (n->ifindex) { |
1253 | struct net_device *dev; | |
1254 | dev = __dev_get_by_index(net, n->ifindex); | |
1255 | if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) | |
1256 | goto nla_put_failure; | |
1257 | } | |
1da177e4 LT |
1258 | #endif |
1259 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 JF |
1260 | gpf = kzalloc(sizeof(struct tc_u32_pcnt) + |
1261 | n->sel.nkeys * sizeof(u64), | |
1262 | GFP_KERNEL); | |
1263 | if (!gpf) | |
1264 | goto nla_put_failure; | |
1265 | ||
1266 | for_each_possible_cpu(cpu) { | |
1267 | int i; | |
1268 | struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu); | |
1269 | ||
1270 | gpf->rcnt += pf->rcnt; | |
1271 | gpf->rhit += pf->rhit; | |
1272 | for (i = 0; i < n->sel.nkeys; i++) | |
1273 | gpf->kcnts[i] += pf->kcnts[i]; | |
1274 | } | |
1275 | ||
9854518e ND |
1276 | if (nla_put_64bit(skb, TCA_U32_PCNT, |
1277 | sizeof(struct tc_u32_pcnt) + | |
1278 | n->sel.nkeys * sizeof(u64), | |
1279 | gpf, TCA_U32_PAD)) { | |
459d5f62 | 1280 | kfree(gpf); |
1b34ec43 | 1281 | goto nla_put_failure; |
459d5f62 JF |
1282 | } |
1283 | kfree(gpf); | |
1da177e4 LT |
1284 | #endif |
1285 | } | |
1286 | ||
4b3550ef PM |
1287 | nla_nest_end(skb, nest); |
1288 | ||
1da177e4 | 1289 | if (TC_U32_KEY(n->handle)) |
5da57f42 | 1290 | if (tcf_exts_dump_stats(skb, &n->exts) < 0) |
add93b61 | 1291 | goto nla_put_failure; |
1da177e4 LT |
1292 | return skb->len; |
1293 | ||
add93b61 | 1294 | nla_put_failure: |
4b3550ef | 1295 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1296 | return -1; |
1297 | } | |
1298 | ||
2eb9d75c | 1299 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
1300 | .kind = "u32", |
1301 | .classify = u32_classify, | |
1302 | .init = u32_init, | |
1303 | .destroy = u32_destroy, | |
1304 | .get = u32_get, | |
1da177e4 LT |
1305 | .change = u32_change, |
1306 | .delete = u32_delete, | |
1307 | .walk = u32_walk, | |
1308 | .dump = u32_dump, | |
07d79fc7 | 1309 | .bind_class = u32_bind_class, |
1da177e4 LT |
1310 | .owner = THIS_MODULE, |
1311 | }; | |
1312 | ||
1313 | static int __init init_u32(void) | |
1314 | { | |
3cd904ec WC |
1315 | int i, ret; |
1316 | ||
6ff9c364 | 1317 | pr_info("u32 classifier\n"); |
1da177e4 | 1318 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 1319 | pr_info(" Performance counters on\n"); |
1da177e4 | 1320 | #endif |
1da177e4 | 1321 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 1322 | pr_info(" input device check on\n"); |
1da177e4 LT |
1323 | #endif |
1324 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 1325 | pr_info(" Actions configured\n"); |
1da177e4 | 1326 | #endif |
3cd904ec WC |
1327 | tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE, |
1328 | sizeof(struct hlist_head), | |
1329 | GFP_KERNEL); | |
1330 | if (!tc_u_common_hash) | |
1331 | return -ENOMEM; | |
1332 | ||
1333 | for (i = 0; i < U32_HASH_SIZE; i++) | |
1334 | INIT_HLIST_HEAD(&tc_u_common_hash[i]); | |
1335 | ||
1336 | ret = register_tcf_proto_ops(&cls_u32_ops); | |
1337 | if (ret) | |
1338 | kvfree(tc_u_common_hash); | |
1339 | return ret; | |
1da177e4 LT |
1340 | } |
1341 | ||
10297b99 | 1342 | static void __exit exit_u32(void) |
1da177e4 LT |
1343 | { |
1344 | unregister_tcf_proto_ops(&cls_u32_ops); | |
3cd904ec | 1345 | kvfree(tc_u_common_hash); |
1da177e4 LT |
1346 | } |
1347 | ||
1348 | module_init(init_u32) | |
1349 | module_exit(exit_u32) | |
1350 | MODULE_LICENSE("GPL"); |