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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 | ||
d34e3e18 SS |
137 | if (tc_skip_sw(n->flags)) { |
138 | n = rcu_dereference_bh(n->next); | |
139 | goto next_knode; | |
140 | } | |
141 | ||
1da177e4 | 142 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 | 143 | if ((skb->mark & n->mask) != n->val) { |
1ce87720 | 144 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
145 | goto next_knode; |
146 | } else { | |
459d5f62 | 147 | __this_cpu_inc(*n->pcpu_success); |
1da177e4 LT |
148 | } |
149 | #endif | |
150 | ||
cc7ec456 | 151 | for (i = n->sel.nkeys; i > 0; i--, key++) { |
66d50d25 | 152 | int toff = off + key->off + (off2 & key->offmask); |
86fce3ba | 153 | __be32 *data, hdata; |
fbc2e7d9 | 154 | |
4e18b3ed | 155 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 156 | goto out; |
157 | ||
86fce3ba | 158 | data = skb_header_pointer(skb, toff, 4, &hdata); |
fbc2e7d9 CG |
159 | if (!data) |
160 | goto out; | |
161 | if ((*data ^ key->val) & key->mask) { | |
1ce87720 | 162 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
163 | goto next_knode; |
164 | } | |
165 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 166 | __this_cpu_inc(n->pf->kcnts[j]); |
1da177e4 LT |
167 | j++; |
168 | #endif | |
169 | } | |
1ce87720 JF |
170 | |
171 | ht = rcu_dereference_bh(n->ht_down); | |
172 | if (!ht) { | |
1da177e4 | 173 | check_terminal: |
cc7ec456 | 174 | if (n->sel.flags & TC_U32_TERMINAL) { |
1da177e4 LT |
175 | |
176 | *res = n->res; | |
177 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 178 | if (!tcf_match_indev(skb, n->ifindex)) { |
1ce87720 | 179 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
180 | goto next_knode; |
181 | } | |
182 | #endif | |
183 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 184 | __this_cpu_inc(n->pf->rhit); |
1da177e4 LT |
185 | #endif |
186 | r = tcf_exts_exec(skb, &n->exts, res); | |
187 | if (r < 0) { | |
1ce87720 | 188 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
189 | goto next_knode; |
190 | } | |
191 | ||
192 | return r; | |
193 | } | |
1ce87720 | 194 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
195 | goto next_knode; |
196 | } | |
197 | ||
198 | /* PUSH */ | |
199 | if (sdepth >= TC_U32_MAXDEPTH) | |
200 | goto deadloop; | |
201 | stack[sdepth].knode = n; | |
fbc2e7d9 | 202 | stack[sdepth].off = off; |
1da177e4 LT |
203 | sdepth++; |
204 | ||
1ce87720 | 205 | ht = rcu_dereference_bh(n->ht_down); |
1da177e4 | 206 | sel = 0; |
fbc2e7d9 | 207 | if (ht->divisor) { |
86fce3ba | 208 | __be32 *data, hdata; |
fbc2e7d9 CG |
209 | |
210 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
86fce3ba | 211 | &hdata); |
fbc2e7d9 CG |
212 | if (!data) |
213 | goto out; | |
214 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
215 | n->fshift); | |
216 | } | |
cc7ec456 | 217 | if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) |
1da177e4 LT |
218 | goto next_ht; |
219 | ||
cc7ec456 | 220 | if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { |
1da177e4 | 221 | off2 = n->sel.off + 3; |
fbc2e7d9 | 222 | if (n->sel.flags & TC_U32_VAROFFSET) { |
86fce3ba | 223 | __be16 *data, hdata; |
fbc2e7d9 CG |
224 | |
225 | data = skb_header_pointer(skb, | |
226 | off + n->sel.offoff, | |
86fce3ba | 227 | 2, &hdata); |
fbc2e7d9 CG |
228 | if (!data) |
229 | goto out; | |
230 | off2 += ntohs(n->sel.offmask & *data) >> | |
231 | n->sel.offshift; | |
232 | } | |
1da177e4 LT |
233 | off2 &= ~3; |
234 | } | |
cc7ec456 | 235 | if (n->sel.flags & TC_U32_EAT) { |
fbc2e7d9 | 236 | off += off2; |
1da177e4 LT |
237 | off2 = 0; |
238 | } | |
239 | ||
fbc2e7d9 | 240 | if (off < skb->len) |
1da177e4 LT |
241 | goto next_ht; |
242 | } | |
243 | ||
244 | /* POP */ | |
245 | if (sdepth--) { | |
246 | n = stack[sdepth].knode; | |
1ce87720 | 247 | ht = rcu_dereference_bh(n->ht_up); |
fbc2e7d9 | 248 | off = stack[sdepth].off; |
1da177e4 LT |
249 | goto check_terminal; |
250 | } | |
fbc2e7d9 | 251 | out: |
1da177e4 LT |
252 | return -1; |
253 | ||
254 | deadloop: | |
e87cc472 | 255 | net_warn_ratelimited("cls_u32: dead loop\n"); |
1da177e4 LT |
256 | return -1; |
257 | } | |
258 | ||
cc7ec456 | 259 | static struct tc_u_hnode * |
1da177e4 LT |
260 | u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) |
261 | { | |
262 | struct tc_u_hnode *ht; | |
263 | ||
1ce87720 JF |
264 | for (ht = rtnl_dereference(tp_c->hlist); |
265 | ht; | |
266 | ht = rtnl_dereference(ht->next)) | |
1da177e4 LT |
267 | if (ht->handle == handle) |
268 | break; | |
269 | ||
270 | return ht; | |
271 | } | |
272 | ||
cc7ec456 | 273 | static struct tc_u_knode * |
1da177e4 LT |
274 | u32_lookup_key(struct tc_u_hnode *ht, u32 handle) |
275 | { | |
cc7ec456 | 276 | unsigned int sel; |
1da177e4 LT |
277 | struct tc_u_knode *n = NULL; |
278 | ||
279 | sel = TC_U32_HASH(handle); | |
280 | if (sel > ht->divisor) | |
281 | goto out; | |
282 | ||
1ce87720 JF |
283 | for (n = rtnl_dereference(ht->ht[sel]); |
284 | n; | |
285 | n = rtnl_dereference(n->next)) | |
1da177e4 LT |
286 | if (n->handle == handle) |
287 | break; | |
288 | out: | |
289 | return n; | |
290 | } | |
291 | ||
292 | ||
293 | static unsigned long u32_get(struct tcf_proto *tp, u32 handle) | |
294 | { | |
295 | struct tc_u_hnode *ht; | |
296 | struct tc_u_common *tp_c = tp->data; | |
297 | ||
298 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
1ce87720 | 299 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
300 | else |
301 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
302 | ||
303 | if (!ht) | |
304 | return 0; | |
305 | ||
306 | if (TC_U32_KEY(handle) == 0) | |
307 | return (unsigned long)ht; | |
308 | ||
309 | return (unsigned long)u32_lookup_key(ht, handle); | |
310 | } | |
311 | ||
1da177e4 LT |
312 | static u32 gen_new_htid(struct tc_u_common *tp_c) |
313 | { | |
314 | int i = 0x800; | |
315 | ||
1ce87720 JF |
316 | /* hgenerator only used inside rtnl lock it is safe to increment |
317 | * without read _copy_ update semantics | |
318 | */ | |
1da177e4 LT |
319 | do { |
320 | if (++tp_c->hgenerator == 0x7FF) | |
321 | tp_c->hgenerator = 1; | |
cc7ec456 | 322 | } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); |
1da177e4 LT |
323 | |
324 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
325 | } | |
326 | ||
327 | static int u32_init(struct tcf_proto *tp) | |
328 | { | |
329 | struct tc_u_hnode *root_ht; | |
330 | struct tc_u_common *tp_c; | |
331 | ||
72b25a91 | 332 | tp_c = tp->q->u32_node; |
1da177e4 | 333 | |
0da974f4 | 334 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
335 | if (root_ht == NULL) |
336 | return -ENOBUFS; | |
337 | ||
1da177e4 LT |
338 | root_ht->divisor = 0; |
339 | root_ht->refcnt++; | |
340 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
341 | root_ht->prio = tp->prio; | |
342 | ||
343 | if (tp_c == NULL) { | |
0da974f4 | 344 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
345 | if (tp_c == NULL) { |
346 | kfree(root_ht); | |
347 | return -ENOBUFS; | |
348 | } | |
1da177e4 | 349 | tp_c->q = tp->q; |
72b25a91 | 350 | tp->q->u32_node = tp_c; |
1da177e4 LT |
351 | } |
352 | ||
353 | tp_c->refcnt++; | |
1ce87720 JF |
354 | RCU_INIT_POINTER(root_ht->next, tp_c->hlist); |
355 | rcu_assign_pointer(tp_c->hlist, root_ht); | |
1da177e4 LT |
356 | root_ht->tp_c = tp_c; |
357 | ||
1ce87720 | 358 | rcu_assign_pointer(tp->root, root_ht); |
1da177e4 LT |
359 | tp->data = tp_c; |
360 | return 0; | |
361 | } | |
362 | ||
de5df632 JF |
363 | static int u32_destroy_key(struct tcf_proto *tp, |
364 | struct tc_u_knode *n, | |
365 | bool free_pf) | |
1da177e4 | 366 | { |
18d0264f | 367 | tcf_exts_destroy(&n->exts); |
1da177e4 LT |
368 | if (n->ht_down) |
369 | n->ht_down->refcnt--; | |
370 | #ifdef CONFIG_CLS_U32_PERF | |
de5df632 JF |
371 | if (free_pf) |
372 | free_percpu(n->pf); | |
a1ddcfee JF |
373 | #endif |
374 | #ifdef CONFIG_CLS_U32_MARK | |
de5df632 JF |
375 | if (free_pf) |
376 | free_percpu(n->pcpu_success); | |
1da177e4 LT |
377 | #endif |
378 | kfree(n); | |
379 | return 0; | |
380 | } | |
381 | ||
de5df632 JF |
382 | /* u32_delete_key_rcu should be called when free'ing a copied |
383 | * version of a tc_u_knode obtained from u32_init_knode(). When | |
384 | * copies are obtained from u32_init_knode() the statistics are | |
385 | * shared between the old and new copies to allow readers to | |
386 | * continue to update the statistics during the copy. To support | |
387 | * this the u32_delete_key_rcu variant does not free the percpu | |
388 | * statistics. | |
389 | */ | |
1ce87720 JF |
390 | static void u32_delete_key_rcu(struct rcu_head *rcu) |
391 | { | |
392 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
393 | ||
de5df632 JF |
394 | u32_destroy_key(key->tp, key, false); |
395 | } | |
396 | ||
397 | /* u32_delete_key_freepf_rcu is the rcu callback variant | |
398 | * that free's the entire structure including the statistics | |
399 | * percpu variables. Only use this if the key is not a copy | |
400 | * returned by u32_init_knode(). See u32_delete_key_rcu() | |
401 | * for the variant that should be used with keys return from | |
402 | * u32_init_knode() | |
403 | */ | |
404 | static void u32_delete_key_freepf_rcu(struct rcu_head *rcu) | |
405 | { | |
406 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
407 | ||
408 | u32_destroy_key(key->tp, key, true); | |
1ce87720 JF |
409 | } |
410 | ||
82d567c2 | 411 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) |
1da177e4 | 412 | { |
1ce87720 JF |
413 | struct tc_u_knode __rcu **kp; |
414 | struct tc_u_knode *pkp; | |
a96366bf | 415 | struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); |
1da177e4 LT |
416 | |
417 | if (ht) { | |
1ce87720 JF |
418 | kp = &ht->ht[TC_U32_HASH(key->handle)]; |
419 | for (pkp = rtnl_dereference(*kp); pkp; | |
420 | kp = &pkp->next, pkp = rtnl_dereference(*kp)) { | |
421 | if (pkp == key) { | |
422 | RCU_INIT_POINTER(*kp, key->next); | |
1da177e4 | 423 | |
a0efb80c | 424 | tcf_unbind_filter(tp, &key->res); |
de5df632 | 425 | call_rcu(&key->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
426 | return 0; |
427 | } | |
428 | } | |
429 | } | |
547b792c | 430 | WARN_ON(1); |
1da177e4 LT |
431 | return 0; |
432 | } | |
433 | ||
a1b7c5fd JF |
434 | static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle) |
435 | { | |
436 | struct net_device *dev = tp->q->dev_queue->dev; | |
437 | struct tc_cls_u32_offload u32_offload = {0}; | |
438 | struct tc_to_netdev offload; | |
439 | ||
440 | offload.type = TC_SETUP_CLSU32; | |
441 | offload.cls_u32 = &u32_offload; | |
442 | ||
9e8ce79c | 443 | if (tc_should_offload(dev, 0)) { |
a1b7c5fd JF |
444 | offload.cls_u32->command = TC_CLSU32_DELETE_KNODE; |
445 | offload.cls_u32->knode.handle = handle; | |
446 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, | |
447 | tp->protocol, &offload); | |
448 | } | |
449 | } | |
450 | ||
d34e3e18 | 451 | static int u32_replace_hw_hnode(struct tcf_proto *tp, |
9e8ce79c JF |
452 | struct tc_u_hnode *h, |
453 | u32 flags) | |
a1b7c5fd JF |
454 | { |
455 | struct net_device *dev = tp->q->dev_queue->dev; | |
456 | struct tc_cls_u32_offload u32_offload = {0}; | |
457 | struct tc_to_netdev offload; | |
d34e3e18 | 458 | int err; |
a1b7c5fd JF |
459 | |
460 | offload.type = TC_SETUP_CLSU32; | |
461 | offload.cls_u32 = &u32_offload; | |
462 | ||
9e8ce79c | 463 | if (tc_should_offload(dev, flags)) { |
a1b7c5fd JF |
464 | offload.cls_u32->command = TC_CLSU32_NEW_HNODE; |
465 | offload.cls_u32->hnode.divisor = h->divisor; | |
466 | offload.cls_u32->hnode.handle = h->handle; | |
467 | offload.cls_u32->hnode.prio = h->prio; | |
468 | ||
d34e3e18 SS |
469 | err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, |
470 | tp->protocol, &offload); | |
471 | if (tc_skip_sw(flags)) | |
472 | return err; | |
a1b7c5fd | 473 | } |
d34e3e18 SS |
474 | |
475 | return 0; | |
a1b7c5fd JF |
476 | } |
477 | ||
478 | static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h) | |
479 | { | |
480 | struct net_device *dev = tp->q->dev_queue->dev; | |
481 | struct tc_cls_u32_offload u32_offload = {0}; | |
482 | struct tc_to_netdev offload; | |
483 | ||
484 | offload.type = TC_SETUP_CLSU32; | |
485 | offload.cls_u32 = &u32_offload; | |
486 | ||
9e8ce79c | 487 | if (tc_should_offload(dev, 0)) { |
a1b7c5fd JF |
488 | offload.cls_u32->command = TC_CLSU32_DELETE_HNODE; |
489 | offload.cls_u32->hnode.divisor = h->divisor; | |
490 | offload.cls_u32->hnode.handle = h->handle; | |
491 | offload.cls_u32->hnode.prio = h->prio; | |
492 | ||
493 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, | |
494 | tp->protocol, &offload); | |
495 | } | |
496 | } | |
497 | ||
d34e3e18 | 498 | static int u32_replace_hw_knode(struct tcf_proto *tp, |
9e8ce79c JF |
499 | struct tc_u_knode *n, |
500 | u32 flags) | |
a1b7c5fd JF |
501 | { |
502 | struct net_device *dev = tp->q->dev_queue->dev; | |
503 | struct tc_cls_u32_offload u32_offload = {0}; | |
504 | struct tc_to_netdev offload; | |
d34e3e18 | 505 | int err; |
a1b7c5fd JF |
506 | |
507 | offload.type = TC_SETUP_CLSU32; | |
508 | offload.cls_u32 = &u32_offload; | |
509 | ||
9e8ce79c | 510 | if (tc_should_offload(dev, flags)) { |
a1b7c5fd JF |
511 | offload.cls_u32->command = TC_CLSU32_REPLACE_KNODE; |
512 | offload.cls_u32->knode.handle = n->handle; | |
513 | offload.cls_u32->knode.fshift = n->fshift; | |
514 | #ifdef CONFIG_CLS_U32_MARK | |
515 | offload.cls_u32->knode.val = n->val; | |
516 | offload.cls_u32->knode.mask = n->mask; | |
517 | #else | |
518 | offload.cls_u32->knode.val = 0; | |
519 | offload.cls_u32->knode.mask = 0; | |
520 | #endif | |
521 | offload.cls_u32->knode.sel = &n->sel; | |
522 | offload.cls_u32->knode.exts = &n->exts; | |
523 | if (n->ht_down) | |
524 | offload.cls_u32->knode.link_handle = n->ht_down->handle; | |
525 | ||
d34e3e18 SS |
526 | err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, |
527 | tp->protocol, &offload); | |
528 | if (tc_skip_sw(flags)) | |
529 | return err; | |
a1b7c5fd | 530 | } |
d34e3e18 SS |
531 | |
532 | return 0; | |
a1b7c5fd JF |
533 | } |
534 | ||
a0efb80c | 535 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) |
1da177e4 LT |
536 | { |
537 | struct tc_u_knode *n; | |
cc7ec456 | 538 | unsigned int h; |
1da177e4 | 539 | |
cc7ec456 | 540 | for (h = 0; h <= ht->divisor; h++) { |
1ce87720 JF |
541 | while ((n = rtnl_dereference(ht->ht[h])) != NULL) { |
542 | RCU_INIT_POINTER(ht->ht[h], | |
543 | rtnl_dereference(n->next)); | |
a0efb80c | 544 | tcf_unbind_filter(tp, &n->res); |
a1b7c5fd | 545 | u32_remove_hw_knode(tp, n->handle); |
de5df632 | 546 | call_rcu(&n->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
547 | } |
548 | } | |
549 | } | |
550 | ||
551 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
552 | { | |
553 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 JF |
554 | struct tc_u_hnode __rcu **hn; |
555 | struct tc_u_hnode *phn; | |
1da177e4 | 556 | |
547b792c | 557 | WARN_ON(ht->refcnt); |
1da177e4 | 558 | |
a0efb80c | 559 | u32_clear_hnode(tp, ht); |
1da177e4 | 560 | |
1ce87720 JF |
561 | hn = &tp_c->hlist; |
562 | for (phn = rtnl_dereference(*hn); | |
563 | phn; | |
564 | hn = &phn->next, phn = rtnl_dereference(*hn)) { | |
565 | if (phn == ht) { | |
a1b7c5fd | 566 | u32_clear_hw_hnode(tp, ht); |
1ce87720 JF |
567 | RCU_INIT_POINTER(*hn, ht->next); |
568 | kfree_rcu(ht, rcu); | |
1da177e4 LT |
569 | return 0; |
570 | } | |
571 | } | |
572 | ||
1da177e4 LT |
573 | return -ENOENT; |
574 | } | |
575 | ||
1e052be6 CW |
576 | static bool ht_empty(struct tc_u_hnode *ht) |
577 | { | |
578 | unsigned int h; | |
579 | ||
580 | for (h = 0; h <= ht->divisor; h++) | |
581 | if (rcu_access_pointer(ht->ht[h])) | |
582 | return false; | |
583 | ||
584 | return true; | |
585 | } | |
586 | ||
587 | static bool u32_destroy(struct tcf_proto *tp, bool force) | |
1da177e4 LT |
588 | { |
589 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 | 590 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 | 591 | |
547b792c | 592 | WARN_ON(root_ht == NULL); |
1da177e4 | 593 | |
1e052be6 CW |
594 | if (!force) { |
595 | if (root_ht) { | |
596 | if (root_ht->refcnt > 1) | |
597 | return false; | |
598 | if (root_ht->refcnt == 1) { | |
599 | if (!ht_empty(root_ht)) | |
600 | return false; | |
601 | } | |
602 | } | |
a6c1aea0 WC |
603 | |
604 | if (tp_c->refcnt > 1) | |
605 | return false; | |
606 | ||
607 | if (tp_c->refcnt == 1) { | |
608 | struct tc_u_hnode *ht; | |
609 | ||
610 | for (ht = rtnl_dereference(tp_c->hlist); | |
611 | ht; | |
612 | ht = rtnl_dereference(ht->next)) | |
613 | if (!ht_empty(ht)) | |
614 | return false; | |
615 | } | |
1e052be6 CW |
616 | } |
617 | ||
1da177e4 LT |
618 | if (root_ht && --root_ht->refcnt == 0) |
619 | u32_destroy_hnode(tp, root_ht); | |
620 | ||
621 | if (--tp_c->refcnt == 0) { | |
622 | struct tc_u_hnode *ht; | |
1da177e4 | 623 | |
72b25a91 | 624 | tp->q->u32_node = NULL; |
1da177e4 | 625 | |
1ce87720 JF |
626 | for (ht = rtnl_dereference(tp_c->hlist); |
627 | ht; | |
628 | ht = rtnl_dereference(ht->next)) { | |
e56cfad1 | 629 | ht->refcnt--; |
a0efb80c | 630 | u32_clear_hnode(tp, ht); |
e56cfad1 | 631 | } |
1da177e4 | 632 | |
1ce87720 JF |
633 | while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) { |
634 | RCU_INIT_POINTER(tp_c->hlist, ht->next); | |
635 | kfree_rcu(ht, rcu); | |
3ff50b79 | 636 | } |
1da177e4 LT |
637 | |
638 | kfree(tp_c); | |
639 | } | |
640 | ||
641 | tp->data = NULL; | |
1e052be6 | 642 | return true; |
1da177e4 LT |
643 | } |
644 | ||
645 | static int u32_delete(struct tcf_proto *tp, unsigned long arg) | |
646 | { | |
cc7ec456 | 647 | struct tc_u_hnode *ht = (struct tc_u_hnode *)arg; |
1ce87720 | 648 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 LT |
649 | |
650 | if (ht == NULL) | |
651 | return 0; | |
652 | ||
a1b7c5fd JF |
653 | if (TC_U32_KEY(ht->handle)) { |
654 | u32_remove_hw_knode(tp, ht->handle); | |
cc7ec456 | 655 | return u32_delete_key(tp, (struct tc_u_knode *)ht); |
a1b7c5fd | 656 | } |
1da177e4 | 657 | |
1ce87720 | 658 | if (root_ht == ht) |
1da177e4 LT |
659 | return -EINVAL; |
660 | ||
e56cfad1 JP |
661 | if (ht->refcnt == 1) { |
662 | ht->refcnt--; | |
1da177e4 | 663 | u32_destroy_hnode(tp, ht); |
e56cfad1 JP |
664 | } else { |
665 | return -EBUSY; | |
666 | } | |
1da177e4 LT |
667 | |
668 | return 0; | |
669 | } | |
670 | ||
7801db8a | 671 | #define NR_U32_NODE (1<<12) |
1da177e4 LT |
672 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) |
673 | { | |
674 | struct tc_u_knode *n; | |
7801db8a CW |
675 | unsigned long i; |
676 | unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long), | |
677 | GFP_KERNEL); | |
678 | if (!bitmap) | |
679 | return handle | 0xFFF; | |
1da177e4 | 680 | |
1ce87720 JF |
681 | for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]); |
682 | n; | |
683 | n = rtnl_dereference(n->next)) | |
7801db8a | 684 | set_bit(TC_U32_NODE(n->handle), bitmap); |
1da177e4 | 685 | |
7801db8a CW |
686 | i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800); |
687 | if (i >= NR_U32_NODE) | |
688 | i = find_next_zero_bit(bitmap, NR_U32_NODE, 1); | |
689 | ||
690 | kfree(bitmap); | |
691 | return handle | (i >= NR_U32_NODE ? 0xFFF : i); | |
1da177e4 LT |
692 | } |
693 | ||
6fa8c014 PM |
694 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
695 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
696 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
697 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
698 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
699 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
700 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
701 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
9e8ce79c | 702 | [TCA_U32_FLAGS] = { .type = NLA_U32 }, |
6fa8c014 PM |
703 | }; |
704 | ||
c1b52739 BL |
705 | static int u32_set_parms(struct net *net, struct tcf_proto *tp, |
706 | unsigned long base, struct tc_u_hnode *ht, | |
add93b61 | 707 | struct tc_u_knode *n, struct nlattr **tb, |
2f7ef2f8 | 708 | struct nlattr *est, bool ovr) |
1da177e4 LT |
709 | { |
710 | int err; | |
711 | struct tcf_exts e; | |
712 | ||
5da57f42 | 713 | tcf_exts_init(&e, TCA_U32_ACT, TCA_U32_POLICE); |
2f7ef2f8 | 714 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
715 | if (err < 0) |
716 | return err; | |
717 | ||
718 | err = -EINVAL; | |
add93b61 | 719 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 720 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 721 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 LT |
722 | |
723 | if (TC_U32_KEY(handle)) | |
724 | goto errout; | |
725 | ||
726 | if (handle) { | |
727 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
728 | ||
729 | if (ht_down == NULL) | |
730 | goto errout; | |
731 | ht_down->refcnt++; | |
732 | } | |
733 | ||
1ce87720 JF |
734 | ht_old = rtnl_dereference(n->ht_down); |
735 | rcu_assign_pointer(n->ht_down, ht_down); | |
1da177e4 | 736 | |
47a1a1d4 PM |
737 | if (ht_old) |
738 | ht_old->refcnt--; | |
1da177e4 | 739 | } |
add93b61 | 740 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 741 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
742 | tcf_bind_filter(tp, &n->res, base); |
743 | } | |
744 | ||
745 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 746 | if (tb[TCA_U32_INDEV]) { |
2519a602 WC |
747 | int ret; |
748 | ret = tcf_change_indev(net, tb[TCA_U32_INDEV]); | |
749 | if (ret < 0) | |
1da177e4 | 750 | goto errout; |
2519a602 | 751 | n->ifindex = ret; |
1da177e4 LT |
752 | } |
753 | #endif | |
754 | tcf_exts_change(tp, &n->exts, &e); | |
755 | ||
756 | return 0; | |
757 | errout: | |
18d0264f | 758 | tcf_exts_destroy(&e); |
1da177e4 LT |
759 | return err; |
760 | } | |
761 | ||
de5df632 JF |
762 | static void u32_replace_knode(struct tcf_proto *tp, |
763 | struct tc_u_common *tp_c, | |
764 | struct tc_u_knode *n) | |
765 | { | |
766 | struct tc_u_knode __rcu **ins; | |
767 | struct tc_u_knode *pins; | |
768 | struct tc_u_hnode *ht; | |
769 | ||
770 | if (TC_U32_HTID(n->handle) == TC_U32_ROOT) | |
771 | ht = rtnl_dereference(tp->root); | |
772 | else | |
773 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle)); | |
774 | ||
775 | ins = &ht->ht[TC_U32_HASH(n->handle)]; | |
776 | ||
777 | /* The node must always exist for it to be replaced if this is not the | |
778 | * case then something went very wrong elsewhere. | |
779 | */ | |
780 | for (pins = rtnl_dereference(*ins); ; | |
781 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
782 | if (pins->handle == n->handle) | |
783 | break; | |
784 | ||
785 | RCU_INIT_POINTER(n->next, pins->next); | |
786 | rcu_assign_pointer(*ins, n); | |
787 | } | |
788 | ||
789 | static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp, | |
790 | struct tc_u_knode *n) | |
791 | { | |
792 | struct tc_u_knode *new; | |
793 | struct tc_u32_sel *s = &n->sel; | |
794 | ||
795 | new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), | |
796 | GFP_KERNEL); | |
797 | ||
798 | if (!new) | |
799 | return NULL; | |
800 | ||
801 | RCU_INIT_POINTER(new->next, n->next); | |
802 | new->handle = n->handle; | |
803 | RCU_INIT_POINTER(new->ht_up, n->ht_up); | |
804 | ||
805 | #ifdef CONFIG_NET_CLS_IND | |
806 | new->ifindex = n->ifindex; | |
807 | #endif | |
808 | new->fshift = n->fshift; | |
809 | new->res = n->res; | |
9e8ce79c | 810 | new->flags = n->flags; |
de5df632 JF |
811 | RCU_INIT_POINTER(new->ht_down, n->ht_down); |
812 | ||
813 | /* bump reference count as long as we hold pointer to structure */ | |
814 | if (new->ht_down) | |
815 | new->ht_down->refcnt++; | |
816 | ||
817 | #ifdef CONFIG_CLS_U32_PERF | |
818 | /* Statistics may be incremented by readers during update | |
819 | * so we must keep them in tact. When the node is later destroyed | |
820 | * a special destroy call must be made to not free the pf memory. | |
821 | */ | |
822 | new->pf = n->pf; | |
823 | #endif | |
824 | ||
825 | #ifdef CONFIG_CLS_U32_MARK | |
826 | new->val = n->val; | |
827 | new->mask = n->mask; | |
828 | /* Similarly success statistics must be moved as pointers */ | |
829 | new->pcpu_success = n->pcpu_success; | |
830 | #endif | |
831 | new->tp = tp; | |
832 | memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
833 | ||
834 | tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE); | |
835 | ||
836 | return new; | |
837 | } | |
838 | ||
c1b52739 | 839 | static int u32_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 840 | struct tcf_proto *tp, unsigned long base, u32 handle, |
add93b61 | 841 | struct nlattr **tca, |
2f7ef2f8 | 842 | unsigned long *arg, bool ovr) |
1da177e4 LT |
843 | { |
844 | struct tc_u_common *tp_c = tp->data; | |
845 | struct tc_u_hnode *ht; | |
846 | struct tc_u_knode *n; | |
847 | struct tc_u32_sel *s; | |
add93b61 PM |
848 | struct nlattr *opt = tca[TCA_OPTIONS]; |
849 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
9e8ce79c | 850 | u32 htid, flags = 0; |
1da177e4 | 851 | int err; |
459d5f62 JF |
852 | #ifdef CONFIG_CLS_U32_PERF |
853 | size_t size; | |
854 | #endif | |
1da177e4 LT |
855 | |
856 | if (opt == NULL) | |
857 | return handle ? -EINVAL : 0; | |
858 | ||
6fa8c014 | 859 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy); |
cee63723 PM |
860 | if (err < 0) |
861 | return err; | |
1da177e4 | 862 | |
d34e3e18 | 863 | if (tb[TCA_U32_FLAGS]) { |
9e8ce79c | 864 | flags = nla_get_u32(tb[TCA_U32_FLAGS]); |
d34e3e18 SS |
865 | if (!tc_flags_valid(flags)) |
866 | return err; | |
867 | } | |
9e8ce79c | 868 | |
cc7ec456 ED |
869 | n = (struct tc_u_knode *)*arg; |
870 | if (n) { | |
de5df632 JF |
871 | struct tc_u_knode *new; |
872 | ||
1da177e4 LT |
873 | if (TC_U32_KEY(n->handle) == 0) |
874 | return -EINVAL; | |
875 | ||
9e8ce79c JF |
876 | if (n->flags != flags) |
877 | return -EINVAL; | |
878 | ||
de5df632 JF |
879 | new = u32_init_knode(tp, n); |
880 | if (!new) | |
881 | return -ENOMEM; | |
882 | ||
883 | err = u32_set_parms(net, tp, base, | |
884 | rtnl_dereference(n->ht_up), new, tb, | |
885 | tca[TCA_RATE], ovr); | |
886 | ||
887 | if (err) { | |
888 | u32_destroy_key(tp, new, false); | |
889 | return err; | |
890 | } | |
891 | ||
d34e3e18 SS |
892 | err = u32_replace_hw_knode(tp, new, flags); |
893 | if (err) { | |
894 | u32_destroy_key(tp, new, false); | |
895 | return err; | |
896 | } | |
897 | ||
de5df632 | 898 | u32_replace_knode(tp, tp_c, new); |
a0efb80c | 899 | tcf_unbind_filter(tp, &n->res); |
de5df632 JF |
900 | call_rcu(&n->rcu, u32_delete_key_rcu); |
901 | return 0; | |
1da177e4 LT |
902 | } |
903 | ||
add93b61 | 904 | if (tb[TCA_U32_DIVISOR]) { |
cc7ec456 | 905 | unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); |
1da177e4 LT |
906 | |
907 | if (--divisor > 0x100) | |
908 | return -EINVAL; | |
909 | if (TC_U32_KEY(handle)) | |
910 | return -EINVAL; | |
911 | if (handle == 0) { | |
912 | handle = gen_new_htid(tp->data); | |
913 | if (handle == 0) | |
914 | return -ENOMEM; | |
915 | } | |
cc7ec456 | 916 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); |
1da177e4 LT |
917 | if (ht == NULL) |
918 | return -ENOBUFS; | |
1da177e4 | 919 | ht->tp_c = tp_c; |
e56cfad1 | 920 | ht->refcnt = 1; |
1da177e4 LT |
921 | ht->divisor = divisor; |
922 | ht->handle = handle; | |
923 | ht->prio = tp->prio; | |
1ce87720 JF |
924 | RCU_INIT_POINTER(ht->next, tp_c->hlist); |
925 | rcu_assign_pointer(tp_c->hlist, ht); | |
1da177e4 | 926 | *arg = (unsigned long)ht; |
a1b7c5fd | 927 | |
9e8ce79c | 928 | u32_replace_hw_hnode(tp, ht, flags); |
1da177e4 LT |
929 | return 0; |
930 | } | |
931 | ||
add93b61 | 932 | if (tb[TCA_U32_HASH]) { |
1587bac4 | 933 | htid = nla_get_u32(tb[TCA_U32_HASH]); |
1da177e4 | 934 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
1ce87720 | 935 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
936 | htid = ht->handle; |
937 | } else { | |
938 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
939 | if (ht == NULL) | |
940 | return -EINVAL; | |
941 | } | |
942 | } else { | |
1ce87720 | 943 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
944 | htid = ht->handle; |
945 | } | |
946 | ||
947 | if (ht->divisor < TC_U32_HASH(htid)) | |
948 | return -EINVAL; | |
949 | ||
950 | if (handle) { | |
951 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
952 | return -EINVAL; | |
953 | handle = htid | TC_U32_NODE(handle); | |
954 | } else | |
955 | handle = gen_new_kid(ht, htid); | |
956 | ||
6fa8c014 | 957 | if (tb[TCA_U32_SEL] == NULL) |
1da177e4 LT |
958 | return -EINVAL; |
959 | ||
add93b61 | 960 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 961 | |
0da974f4 | 962 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
1da177e4 LT |
963 | if (n == NULL) |
964 | return -ENOBUFS; | |
965 | ||
1da177e4 | 966 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 JF |
967 | size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64); |
968 | n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt)); | |
969 | if (!n->pf) { | |
1da177e4 LT |
970 | kfree(n); |
971 | return -ENOBUFS; | |
972 | } | |
1da177e4 LT |
973 | #endif |
974 | ||
975 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
a96366bf | 976 | RCU_INIT_POINTER(n->ht_up, ht); |
1da177e4 | 977 | n->handle = handle; |
b2268016 | 978 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
9e8ce79c | 979 | n->flags = flags; |
5da57f42 | 980 | tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE); |
1ce87720 | 981 | n->tp = tp; |
1da177e4 LT |
982 | |
983 | #ifdef CONFIG_CLS_U32_MARK | |
459d5f62 | 984 | n->pcpu_success = alloc_percpu(u32); |
a1ddcfee JF |
985 | if (!n->pcpu_success) { |
986 | err = -ENOMEM; | |
987 | goto errout; | |
988 | } | |
459d5f62 | 989 | |
add93b61 | 990 | if (tb[TCA_U32_MARK]) { |
1da177e4 LT |
991 | struct tc_u32_mark *mark; |
992 | ||
add93b61 | 993 | mark = nla_data(tb[TCA_U32_MARK]); |
459d5f62 JF |
994 | n->val = mark->val; |
995 | n->mask = mark->mask; | |
1da177e4 LT |
996 | } |
997 | #endif | |
998 | ||
2f7ef2f8 | 999 | err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr); |
1da177e4 | 1000 | if (err == 0) { |
1ce87720 JF |
1001 | struct tc_u_knode __rcu **ins; |
1002 | struct tc_u_knode *pins; | |
1003 | ||
d34e3e18 SS |
1004 | err = u32_replace_hw_knode(tp, n, flags); |
1005 | if (err) | |
1006 | goto errhw; | |
1007 | ||
1ce87720 JF |
1008 | ins = &ht->ht[TC_U32_HASH(handle)]; |
1009 | for (pins = rtnl_dereference(*ins); pins; | |
1010 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
1011 | if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle)) | |
1da177e4 LT |
1012 | break; |
1013 | ||
1ce87720 JF |
1014 | RCU_INIT_POINTER(n->next, pins); |
1015 | rcu_assign_pointer(*ins, n); | |
1da177e4 LT |
1016 | *arg = (unsigned long)n; |
1017 | return 0; | |
1018 | } | |
a1ddcfee | 1019 | |
d34e3e18 | 1020 | errhw: |
a1ddcfee JF |
1021 | #ifdef CONFIG_CLS_U32_MARK |
1022 | free_percpu(n->pcpu_success); | |
a2aeb02a | 1023 | errout: |
a1ddcfee JF |
1024 | #endif |
1025 | ||
1da177e4 | 1026 | #ifdef CONFIG_CLS_U32_PERF |
1ce87720 | 1027 | free_percpu(n->pf); |
1da177e4 LT |
1028 | #endif |
1029 | kfree(n); | |
1030 | return err; | |
1031 | } | |
1032 | ||
1033 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
1034 | { | |
1035 | struct tc_u_common *tp_c = tp->data; | |
1036 | struct tc_u_hnode *ht; | |
1037 | struct tc_u_knode *n; | |
cc7ec456 | 1038 | unsigned int h; |
1da177e4 LT |
1039 | |
1040 | if (arg->stop) | |
1041 | return; | |
1042 | ||
1ce87720 JF |
1043 | for (ht = rtnl_dereference(tp_c->hlist); |
1044 | ht; | |
1045 | ht = rtnl_dereference(ht->next)) { | |
1da177e4 LT |
1046 | if (ht->prio != tp->prio) |
1047 | continue; | |
1048 | if (arg->count >= arg->skip) { | |
1049 | if (arg->fn(tp, (unsigned long)ht, arg) < 0) { | |
1050 | arg->stop = 1; | |
1051 | return; | |
1052 | } | |
1053 | } | |
1054 | arg->count++; | |
1055 | for (h = 0; h <= ht->divisor; h++) { | |
1ce87720 JF |
1056 | for (n = rtnl_dereference(ht->ht[h]); |
1057 | n; | |
1058 | n = rtnl_dereference(n->next)) { | |
1da177e4 LT |
1059 | if (arg->count < arg->skip) { |
1060 | arg->count++; | |
1061 | continue; | |
1062 | } | |
1063 | if (arg->fn(tp, (unsigned long)n, arg) < 0) { | |
1064 | arg->stop = 1; | |
1065 | return; | |
1066 | } | |
1067 | arg->count++; | |
1068 | } | |
1069 | } | |
1070 | } | |
1071 | } | |
1072 | ||
832d1d5b | 1073 | static int u32_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
1074 | struct sk_buff *skb, struct tcmsg *t) |
1075 | { | |
cc7ec456 | 1076 | struct tc_u_knode *n = (struct tc_u_knode *)fh; |
1ce87720 | 1077 | struct tc_u_hnode *ht_up, *ht_down; |
4b3550ef | 1078 | struct nlattr *nest; |
1da177e4 LT |
1079 | |
1080 | if (n == NULL) | |
1081 | return skb->len; | |
1082 | ||
1083 | t->tcm_handle = n->handle; | |
1084 | ||
4b3550ef PM |
1085 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1086 | if (nest == NULL) | |
1087 | goto nla_put_failure; | |
1da177e4 LT |
1088 | |
1089 | if (TC_U32_KEY(n->handle) == 0) { | |
cc7ec456 ED |
1090 | struct tc_u_hnode *ht = (struct tc_u_hnode *)fh; |
1091 | u32 divisor = ht->divisor + 1; | |
1092 | ||
1b34ec43 DM |
1093 | if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) |
1094 | goto nla_put_failure; | |
1da177e4 | 1095 | } else { |
459d5f62 JF |
1096 | #ifdef CONFIG_CLS_U32_PERF |
1097 | struct tc_u32_pcnt *gpf; | |
459d5f62 | 1098 | int cpu; |
80aab73d | 1099 | #endif |
459d5f62 | 1100 | |
1b34ec43 DM |
1101 | if (nla_put(skb, TCA_U32_SEL, |
1102 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
1103 | &n->sel)) | |
1104 | goto nla_put_failure; | |
1ce87720 JF |
1105 | |
1106 | ht_up = rtnl_dereference(n->ht_up); | |
1107 | if (ht_up) { | |
1da177e4 | 1108 | u32 htid = n->handle & 0xFFFFF000; |
1b34ec43 DM |
1109 | if (nla_put_u32(skb, TCA_U32_HASH, htid)) |
1110 | goto nla_put_failure; | |
1da177e4 | 1111 | } |
1b34ec43 DM |
1112 | if (n->res.classid && |
1113 | nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) | |
1114 | goto nla_put_failure; | |
1ce87720 JF |
1115 | |
1116 | ht_down = rtnl_dereference(n->ht_down); | |
1117 | if (ht_down && | |
1118 | nla_put_u32(skb, TCA_U32_LINK, ht_down->handle)) | |
1b34ec43 | 1119 | goto nla_put_failure; |
1da177e4 | 1120 | |
9e8ce79c JF |
1121 | if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags)) |
1122 | goto nla_put_failure; | |
1123 | ||
1da177e4 | 1124 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 JF |
1125 | if ((n->val || n->mask)) { |
1126 | struct tc_u32_mark mark = {.val = n->val, | |
1127 | .mask = n->mask, | |
1128 | .success = 0}; | |
80aab73d | 1129 | int cpum; |
459d5f62 | 1130 | |
80aab73d JF |
1131 | for_each_possible_cpu(cpum) { |
1132 | __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum); | |
459d5f62 JF |
1133 | |
1134 | mark.success += cnt; | |
1135 | } | |
1136 | ||
1137 | if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark)) | |
1138 | goto nla_put_failure; | |
1139 | } | |
1da177e4 LT |
1140 | #endif |
1141 | ||
5da57f42 | 1142 | if (tcf_exts_dump(skb, &n->exts) < 0) |
add93b61 | 1143 | goto nla_put_failure; |
1da177e4 LT |
1144 | |
1145 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 WC |
1146 | if (n->ifindex) { |
1147 | struct net_device *dev; | |
1148 | dev = __dev_get_by_index(net, n->ifindex); | |
1149 | if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) | |
1150 | goto nla_put_failure; | |
1151 | } | |
1da177e4 LT |
1152 | #endif |
1153 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 JF |
1154 | gpf = kzalloc(sizeof(struct tc_u32_pcnt) + |
1155 | n->sel.nkeys * sizeof(u64), | |
1156 | GFP_KERNEL); | |
1157 | if (!gpf) | |
1158 | goto nla_put_failure; | |
1159 | ||
1160 | for_each_possible_cpu(cpu) { | |
1161 | int i; | |
1162 | struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu); | |
1163 | ||
1164 | gpf->rcnt += pf->rcnt; | |
1165 | gpf->rhit += pf->rhit; | |
1166 | for (i = 0; i < n->sel.nkeys; i++) | |
1167 | gpf->kcnts[i] += pf->kcnts[i]; | |
1168 | } | |
1169 | ||
9854518e ND |
1170 | if (nla_put_64bit(skb, TCA_U32_PCNT, |
1171 | sizeof(struct tc_u32_pcnt) + | |
1172 | n->sel.nkeys * sizeof(u64), | |
1173 | gpf, TCA_U32_PAD)) { | |
459d5f62 | 1174 | kfree(gpf); |
1b34ec43 | 1175 | goto nla_put_failure; |
459d5f62 JF |
1176 | } |
1177 | kfree(gpf); | |
1da177e4 LT |
1178 | #endif |
1179 | } | |
1180 | ||
4b3550ef PM |
1181 | nla_nest_end(skb, nest); |
1182 | ||
1da177e4 | 1183 | if (TC_U32_KEY(n->handle)) |
5da57f42 | 1184 | if (tcf_exts_dump_stats(skb, &n->exts) < 0) |
add93b61 | 1185 | goto nla_put_failure; |
1da177e4 LT |
1186 | return skb->len; |
1187 | ||
add93b61 | 1188 | nla_put_failure: |
4b3550ef | 1189 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1190 | return -1; |
1191 | } | |
1192 | ||
2eb9d75c | 1193 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
1194 | .kind = "u32", |
1195 | .classify = u32_classify, | |
1196 | .init = u32_init, | |
1197 | .destroy = u32_destroy, | |
1198 | .get = u32_get, | |
1da177e4 LT |
1199 | .change = u32_change, |
1200 | .delete = u32_delete, | |
1201 | .walk = u32_walk, | |
1202 | .dump = u32_dump, | |
1203 | .owner = THIS_MODULE, | |
1204 | }; | |
1205 | ||
1206 | static int __init init_u32(void) | |
1207 | { | |
6ff9c364 | 1208 | pr_info("u32 classifier\n"); |
1da177e4 | 1209 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 1210 | pr_info(" Performance counters on\n"); |
1da177e4 | 1211 | #endif |
1da177e4 | 1212 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 1213 | pr_info(" input device check on\n"); |
1da177e4 LT |
1214 | #endif |
1215 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 1216 | pr_info(" Actions configured\n"); |
1da177e4 LT |
1217 | #endif |
1218 | return register_tcf_proto_ops(&cls_u32_ops); | |
1219 | } | |
1220 | ||
10297b99 | 1221 | static void __exit exit_u32(void) |
1da177e4 LT |
1222 | { |
1223 | unregister_tcf_proto_ops(&cls_u32_ops); | |
1224 | } | |
1225 | ||
1226 | module_init(init_u32) | |
1227 | module_exit(exit_u32) | |
1228 | MODULE_LICENSE("GPL"); |