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> |
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> | |
a1b7c5fd | 48 | #include <linux/netdevice.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; |
1ce87720 | 71 | struct rcu_head rcu; |
4e2840ee JF |
72 | /* The 'sel' field MUST be the last field in structure to allow for |
73 | * tc_u32_keys allocated at end of structure. | |
74 | */ | |
75 | struct tc_u32_sel sel; | |
1da177e4 LT |
76 | }; |
77 | ||
cc7ec456 | 78 | struct tc_u_hnode { |
1ce87720 | 79 | struct tc_u_hnode __rcu *next; |
1da177e4 LT |
80 | u32 handle; |
81 | u32 prio; | |
82 | struct tc_u_common *tp_c; | |
83 | int refcnt; | |
cc7ec456 | 84 | unsigned int divisor; |
1ce87720 | 85 | struct rcu_head rcu; |
5778d39d WC |
86 | /* The 'ht' field MUST be the last field in structure to allow for |
87 | * more entries allocated at end of structure. | |
88 | */ | |
89 | struct tc_u_knode __rcu *ht[1]; | |
1da177e4 LT |
90 | }; |
91 | ||
cc7ec456 | 92 | struct tc_u_common { |
1ce87720 | 93 | struct tc_u_hnode __rcu *hlist; |
1da177e4 LT |
94 | struct Qdisc *q; |
95 | int refcnt; | |
96 | u32 hgenerator; | |
3cd904ec | 97 | struct hlist_node hnode; |
1ce87720 | 98 | struct rcu_head rcu; |
1da177e4 LT |
99 | }; |
100 | ||
cc7ec456 ED |
101 | static inline unsigned int u32_hash_fold(__be32 key, |
102 | const struct tc_u32_sel *sel, | |
103 | u8 fshift) | |
1da177e4 | 104 | { |
cc7ec456 | 105 | unsigned int h = ntohl(key & sel->hmask) >> fshift; |
1da177e4 LT |
106 | |
107 | return h; | |
108 | } | |
109 | ||
5a7a5555 JHS |
110 | static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
111 | struct tcf_result *res) | |
1da177e4 LT |
112 | { |
113 | struct { | |
114 | struct tc_u_knode *knode; | |
fbc2e7d9 | 115 | unsigned int off; |
1da177e4 LT |
116 | } stack[TC_U32_MAXDEPTH]; |
117 | ||
1ce87720 | 118 | struct tc_u_hnode *ht = rcu_dereference_bh(tp->root); |
fbc2e7d9 | 119 | unsigned int off = skb_network_offset(skb); |
1da177e4 LT |
120 | struct tc_u_knode *n; |
121 | int sdepth = 0; | |
122 | int off2 = 0; | |
123 | int sel = 0; | |
124 | #ifdef CONFIG_CLS_U32_PERF | |
125 | int j; | |
126 | #endif | |
127 | int i, r; | |
128 | ||
129 | next_ht: | |
1ce87720 | 130 | n = rcu_dereference_bh(ht->ht[sel]); |
1da177e4 LT |
131 | |
132 | next_knode: | |
133 | if (n) { | |
134 | struct tc_u32_key *key = n->sel.keys; | |
135 | ||
136 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 137 | __this_cpu_inc(n->pf->rcnt); |
1da177e4 LT |
138 | j = 0; |
139 | #endif | |
140 | ||
d34e3e18 SS |
141 | if (tc_skip_sw(n->flags)) { |
142 | n = rcu_dereference_bh(n->next); | |
143 | goto next_knode; | |
144 | } | |
145 | ||
1da177e4 | 146 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 | 147 | if ((skb->mark & n->mask) != n->val) { |
1ce87720 | 148 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
149 | goto next_knode; |
150 | } else { | |
459d5f62 | 151 | __this_cpu_inc(*n->pcpu_success); |
1da177e4 LT |
152 | } |
153 | #endif | |
154 | ||
cc7ec456 | 155 | for (i = n->sel.nkeys; i > 0; i--, key++) { |
66d50d25 | 156 | int toff = off + key->off + (off2 & key->offmask); |
86fce3ba | 157 | __be32 *data, hdata; |
fbc2e7d9 | 158 | |
4e18b3ed | 159 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 160 | goto out; |
161 | ||
86fce3ba | 162 | data = skb_header_pointer(skb, toff, 4, &hdata); |
fbc2e7d9 CG |
163 | if (!data) |
164 | goto out; | |
165 | if ((*data ^ key->val) & key->mask) { | |
1ce87720 | 166 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
167 | goto next_knode; |
168 | } | |
169 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 170 | __this_cpu_inc(n->pf->kcnts[j]); |
1da177e4 LT |
171 | j++; |
172 | #endif | |
173 | } | |
1ce87720 JF |
174 | |
175 | ht = rcu_dereference_bh(n->ht_down); | |
176 | if (!ht) { | |
1da177e4 | 177 | check_terminal: |
cc7ec456 | 178 | if (n->sel.flags & TC_U32_TERMINAL) { |
1da177e4 LT |
179 | |
180 | *res = n->res; | |
181 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 182 | if (!tcf_match_indev(skb, n->ifindex)) { |
1ce87720 | 183 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
184 | goto next_knode; |
185 | } | |
186 | #endif | |
187 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 188 | __this_cpu_inc(n->pf->rhit); |
1da177e4 LT |
189 | #endif |
190 | r = tcf_exts_exec(skb, &n->exts, res); | |
191 | if (r < 0) { | |
1ce87720 | 192 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
193 | goto next_knode; |
194 | } | |
195 | ||
196 | return r; | |
197 | } | |
1ce87720 | 198 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
199 | goto next_knode; |
200 | } | |
201 | ||
202 | /* PUSH */ | |
203 | if (sdepth >= TC_U32_MAXDEPTH) | |
204 | goto deadloop; | |
205 | stack[sdepth].knode = n; | |
fbc2e7d9 | 206 | stack[sdepth].off = off; |
1da177e4 LT |
207 | sdepth++; |
208 | ||
1ce87720 | 209 | ht = rcu_dereference_bh(n->ht_down); |
1da177e4 | 210 | sel = 0; |
fbc2e7d9 | 211 | if (ht->divisor) { |
86fce3ba | 212 | __be32 *data, hdata; |
fbc2e7d9 CG |
213 | |
214 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
86fce3ba | 215 | &hdata); |
fbc2e7d9 CG |
216 | if (!data) |
217 | goto out; | |
218 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
219 | n->fshift); | |
220 | } | |
cc7ec456 | 221 | if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) |
1da177e4 LT |
222 | goto next_ht; |
223 | ||
cc7ec456 | 224 | if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { |
1da177e4 | 225 | off2 = n->sel.off + 3; |
fbc2e7d9 | 226 | if (n->sel.flags & TC_U32_VAROFFSET) { |
86fce3ba | 227 | __be16 *data, hdata; |
fbc2e7d9 CG |
228 | |
229 | data = skb_header_pointer(skb, | |
230 | off + n->sel.offoff, | |
86fce3ba | 231 | 2, &hdata); |
fbc2e7d9 CG |
232 | if (!data) |
233 | goto out; | |
234 | off2 += ntohs(n->sel.offmask & *data) >> | |
235 | n->sel.offshift; | |
236 | } | |
1da177e4 LT |
237 | off2 &= ~3; |
238 | } | |
cc7ec456 | 239 | if (n->sel.flags & TC_U32_EAT) { |
fbc2e7d9 | 240 | off += off2; |
1da177e4 LT |
241 | off2 = 0; |
242 | } | |
243 | ||
fbc2e7d9 | 244 | if (off < skb->len) |
1da177e4 LT |
245 | goto next_ht; |
246 | } | |
247 | ||
248 | /* POP */ | |
249 | if (sdepth--) { | |
250 | n = stack[sdepth].knode; | |
1ce87720 | 251 | ht = rcu_dereference_bh(n->ht_up); |
fbc2e7d9 | 252 | off = stack[sdepth].off; |
1da177e4 LT |
253 | goto check_terminal; |
254 | } | |
fbc2e7d9 | 255 | out: |
1da177e4 LT |
256 | return -1; |
257 | ||
258 | deadloop: | |
e87cc472 | 259 | net_warn_ratelimited("cls_u32: dead loop\n"); |
1da177e4 LT |
260 | return -1; |
261 | } | |
262 | ||
5a7a5555 | 263 | static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) |
1da177e4 LT |
264 | { |
265 | struct tc_u_hnode *ht; | |
266 | ||
1ce87720 JF |
267 | for (ht = rtnl_dereference(tp_c->hlist); |
268 | ht; | |
269 | ht = rtnl_dereference(ht->next)) | |
1da177e4 LT |
270 | if (ht->handle == handle) |
271 | break; | |
272 | ||
273 | return ht; | |
274 | } | |
275 | ||
5a7a5555 | 276 | static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle) |
1da177e4 | 277 | { |
cc7ec456 | 278 | unsigned int sel; |
1da177e4 LT |
279 | struct tc_u_knode *n = NULL; |
280 | ||
281 | sel = TC_U32_HASH(handle); | |
282 | if (sel > ht->divisor) | |
283 | goto out; | |
284 | ||
1ce87720 JF |
285 | for (n = rtnl_dereference(ht->ht[sel]); |
286 | n; | |
287 | n = rtnl_dereference(n->next)) | |
1da177e4 LT |
288 | if (n->handle == handle) |
289 | break; | |
290 | out: | |
291 | return n; | |
292 | } | |
293 | ||
294 | ||
8113c095 | 295 | static void *u32_get(struct tcf_proto *tp, u32 handle) |
1da177e4 LT |
296 | { |
297 | struct tc_u_hnode *ht; | |
298 | struct tc_u_common *tp_c = tp->data; | |
299 | ||
300 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
1ce87720 | 301 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
302 | else |
303 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
304 | ||
305 | if (!ht) | |
8113c095 | 306 | return NULL; |
1da177e4 LT |
307 | |
308 | if (TC_U32_KEY(handle) == 0) | |
8113c095 | 309 | return ht; |
1da177e4 | 310 | |
8113c095 | 311 | return u32_lookup_key(ht, handle); |
1da177e4 LT |
312 | } |
313 | ||
1da177e4 LT |
314 | static u32 gen_new_htid(struct tc_u_common *tp_c) |
315 | { | |
316 | int i = 0x800; | |
317 | ||
1ce87720 JF |
318 | /* hgenerator only used inside rtnl lock it is safe to increment |
319 | * without read _copy_ update semantics | |
320 | */ | |
1da177e4 LT |
321 | do { |
322 | if (++tp_c->hgenerator == 0x7FF) | |
323 | tp_c->hgenerator = 1; | |
cc7ec456 | 324 | } while (--i > 0 && u32_lookup_ht(tp_c, (tp_c->hgenerator|0x800)<<20)); |
1da177e4 LT |
325 | |
326 | return i > 0 ? (tp_c->hgenerator|0x800)<<20 : 0; | |
327 | } | |
328 | ||
3cd904ec WC |
329 | static struct hlist_head *tc_u_common_hash; |
330 | ||
331 | #define U32_HASH_SHIFT 10 | |
332 | #define U32_HASH_SIZE (1 << U32_HASH_SHIFT) | |
333 | ||
334 | static unsigned int tc_u_hash(const struct tcf_proto *tp) | |
335 | { | |
336 | struct net_device *dev = tp->q->dev_queue->dev; | |
337 | u32 qhandle = tp->q->handle; | |
338 | int ifindex = dev->ifindex; | |
339 | ||
340 | return hash_64((u64)ifindex << 32 | qhandle, U32_HASH_SHIFT); | |
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) { | |
350 | if (tc->q == tp->q) | |
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 LT |
368 | root_ht->refcnt++; |
369 | root_ht->handle = tp_c ? gen_new_htid(tp_c) : 0x80000000; | |
370 | root_ht->prio = tp->prio; | |
371 | ||
372 | if (tp_c == NULL) { | |
0da974f4 | 373 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
374 | if (tp_c == NULL) { |
375 | kfree(root_ht); | |
376 | return -ENOBUFS; | |
377 | } | |
1da177e4 | 378 | tp_c->q = tp->q; |
3cd904ec WC |
379 | INIT_HLIST_NODE(&tp_c->hnode); |
380 | ||
381 | h = tc_u_hash(tp); | |
382 | hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]); | |
1da177e4 LT |
383 | } |
384 | ||
385 | tp_c->refcnt++; | |
1ce87720 JF |
386 | RCU_INIT_POINTER(root_ht->next, tp_c->hlist); |
387 | rcu_assign_pointer(tp_c->hlist, root_ht); | |
1da177e4 LT |
388 | root_ht->tp_c = tp_c; |
389 | ||
1ce87720 | 390 | rcu_assign_pointer(tp->root, root_ht); |
1da177e4 LT |
391 | tp->data = tp_c; |
392 | return 0; | |
393 | } | |
394 | ||
5a7a5555 | 395 | static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n, |
de5df632 | 396 | bool free_pf) |
1da177e4 | 397 | { |
18d0264f | 398 | tcf_exts_destroy(&n->exts); |
1da177e4 LT |
399 | if (n->ht_down) |
400 | n->ht_down->refcnt--; | |
401 | #ifdef CONFIG_CLS_U32_PERF | |
de5df632 JF |
402 | if (free_pf) |
403 | free_percpu(n->pf); | |
a1ddcfee JF |
404 | #endif |
405 | #ifdef CONFIG_CLS_U32_MARK | |
de5df632 JF |
406 | if (free_pf) |
407 | free_percpu(n->pcpu_success); | |
1da177e4 LT |
408 | #endif |
409 | kfree(n); | |
410 | return 0; | |
411 | } | |
412 | ||
de5df632 JF |
413 | /* u32_delete_key_rcu should be called when free'ing a copied |
414 | * version of a tc_u_knode obtained from u32_init_knode(). When | |
415 | * copies are obtained from u32_init_knode() the statistics are | |
416 | * shared between the old and new copies to allow readers to | |
417 | * continue to update the statistics during the copy. To support | |
418 | * this the u32_delete_key_rcu variant does not free the percpu | |
419 | * statistics. | |
420 | */ | |
1ce87720 JF |
421 | static void u32_delete_key_rcu(struct rcu_head *rcu) |
422 | { | |
423 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
424 | ||
de5df632 JF |
425 | u32_destroy_key(key->tp, key, false); |
426 | } | |
427 | ||
428 | /* u32_delete_key_freepf_rcu is the rcu callback variant | |
429 | * that free's the entire structure including the statistics | |
430 | * percpu variables. Only use this if the key is not a copy | |
431 | * returned by u32_init_knode(). See u32_delete_key_rcu() | |
432 | * for the variant that should be used with keys return from | |
433 | * u32_init_knode() | |
434 | */ | |
435 | static void u32_delete_key_freepf_rcu(struct rcu_head *rcu) | |
436 | { | |
437 | struct tc_u_knode *key = container_of(rcu, struct tc_u_knode, rcu); | |
438 | ||
439 | u32_destroy_key(key->tp, key, true); | |
1ce87720 JF |
440 | } |
441 | ||
82d567c2 | 442 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) |
1da177e4 | 443 | { |
1ce87720 JF |
444 | struct tc_u_knode __rcu **kp; |
445 | struct tc_u_knode *pkp; | |
a96366bf | 446 | struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); |
1da177e4 LT |
447 | |
448 | if (ht) { | |
1ce87720 JF |
449 | kp = &ht->ht[TC_U32_HASH(key->handle)]; |
450 | for (pkp = rtnl_dereference(*kp); pkp; | |
451 | kp = &pkp->next, pkp = rtnl_dereference(*kp)) { | |
452 | if (pkp == key) { | |
453 | RCU_INIT_POINTER(*kp, key->next); | |
1da177e4 | 454 | |
a0efb80c | 455 | tcf_unbind_filter(tp, &key->res); |
de5df632 | 456 | call_rcu(&key->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
457 | return 0; |
458 | } | |
459 | } | |
460 | } | |
547b792c | 461 | WARN_ON(1); |
1da177e4 LT |
462 | return 0; |
463 | } | |
464 | ||
a1b7c5fd JF |
465 | static void u32_remove_hw_knode(struct tcf_proto *tp, u32 handle) |
466 | { | |
467 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 468 | struct tc_cls_u32_offload cls_u32 = {}; |
a1b7c5fd | 469 | |
7b06e8ae | 470 | if (!tc_should_offload(dev, 0)) |
de4784ca | 471 | return; |
a1b7c5fd | 472 | |
de4784ca JP |
473 | tc_cls_common_offload_init(&cls_u32.common, tp); |
474 | cls_u32.command = TC_CLSU32_DELETE_KNODE; | |
475 | cls_u32.knode.handle = handle; | |
476 | ||
477 | dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32); | |
a1b7c5fd JF |
478 | } |
479 | ||
5a7a5555 JHS |
480 | static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h, |
481 | u32 flags) | |
a1b7c5fd JF |
482 | { |
483 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 484 | struct tc_cls_u32_offload cls_u32 = {}; |
d34e3e18 | 485 | int err; |
a1b7c5fd | 486 | |
7b06e8ae | 487 | if (!tc_should_offload(dev, flags)) |
d47a0f38 JK |
488 | return tc_skip_sw(flags) ? -EINVAL : 0; |
489 | ||
de4784ca JP |
490 | tc_cls_common_offload_init(&cls_u32.common, tp); |
491 | cls_u32.command = TC_CLSU32_NEW_HNODE; | |
492 | cls_u32.hnode.divisor = h->divisor; | |
493 | cls_u32.hnode.handle = h->handle; | |
494 | cls_u32.hnode.prio = h->prio; | |
a1b7c5fd | 495 | |
de4784ca | 496 | err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32); |
d47a0f38 JK |
497 | if (tc_skip_sw(flags)) |
498 | return err; | |
d34e3e18 SS |
499 | |
500 | return 0; | |
a1b7c5fd JF |
501 | } |
502 | ||
503 | static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h) | |
504 | { | |
505 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 506 | struct tc_cls_u32_offload cls_u32 = {}; |
a1b7c5fd | 507 | |
7b06e8ae | 508 | if (!tc_should_offload(dev, 0)) |
de4784ca | 509 | return; |
a1b7c5fd | 510 | |
de4784ca JP |
511 | tc_cls_common_offload_init(&cls_u32.common, tp); |
512 | cls_u32.command = TC_CLSU32_DELETE_HNODE; | |
513 | cls_u32.hnode.divisor = h->divisor; | |
514 | cls_u32.hnode.handle = h->handle; | |
515 | cls_u32.hnode.prio = h->prio; | |
a1b7c5fd | 516 | |
de4784ca | 517 | dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32); |
a1b7c5fd JF |
518 | } |
519 | ||
5a7a5555 JHS |
520 | static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, |
521 | u32 flags) | |
a1b7c5fd JF |
522 | { |
523 | struct net_device *dev = tp->q->dev_queue->dev; | |
de4784ca | 524 | struct tc_cls_u32_offload cls_u32 = {}; |
d34e3e18 | 525 | int err; |
a1b7c5fd | 526 | |
7b06e8ae | 527 | if (!tc_should_offload(dev, flags)) |
201c44bd JK |
528 | return tc_skip_sw(flags) ? -EINVAL : 0; |
529 | ||
de4784ca JP |
530 | tc_cls_common_offload_init(&cls_u32.common, tp); |
531 | cls_u32.command = TC_CLSU32_REPLACE_KNODE; | |
532 | cls_u32.knode.handle = n->handle; | |
533 | cls_u32.knode.fshift = n->fshift; | |
a1b7c5fd | 534 | #ifdef CONFIG_CLS_U32_MARK |
de4784ca JP |
535 | cls_u32.knode.val = n->val; |
536 | cls_u32.knode.mask = n->mask; | |
a1b7c5fd | 537 | #else |
de4784ca JP |
538 | cls_u32.knode.val = 0; |
539 | cls_u32.knode.mask = 0; | |
a1b7c5fd | 540 | #endif |
de4784ca JP |
541 | cls_u32.knode.sel = &n->sel; |
542 | cls_u32.knode.exts = &n->exts; | |
201c44bd | 543 | if (n->ht_down) |
de4784ca | 544 | cls_u32.knode.link_handle = n->ht_down->handle; |
201c44bd | 545 | |
de4784ca | 546 | err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSU32, &cls_u32); |
24d3dc6d OG |
547 | |
548 | if (!err) | |
549 | n->flags |= TCA_CLS_FLAGS_IN_HW; | |
550 | ||
201c44bd JK |
551 | if (tc_skip_sw(flags)) |
552 | return err; | |
d34e3e18 SS |
553 | |
554 | return 0; | |
a1b7c5fd JF |
555 | } |
556 | ||
a0efb80c | 557 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) |
1da177e4 LT |
558 | { |
559 | struct tc_u_knode *n; | |
cc7ec456 | 560 | unsigned int h; |
1da177e4 | 561 | |
cc7ec456 | 562 | for (h = 0; h <= ht->divisor; h++) { |
1ce87720 JF |
563 | while ((n = rtnl_dereference(ht->ht[h])) != NULL) { |
564 | RCU_INIT_POINTER(ht->ht[h], | |
565 | rtnl_dereference(n->next)); | |
a0efb80c | 566 | tcf_unbind_filter(tp, &n->res); |
a1b7c5fd | 567 | u32_remove_hw_knode(tp, n->handle); |
de5df632 | 568 | call_rcu(&n->rcu, u32_delete_key_freepf_rcu); |
1da177e4 LT |
569 | } |
570 | } | |
571 | } | |
572 | ||
573 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht) | |
574 | { | |
575 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 JF |
576 | struct tc_u_hnode __rcu **hn; |
577 | struct tc_u_hnode *phn; | |
1da177e4 | 578 | |
547b792c | 579 | WARN_ON(ht->refcnt); |
1da177e4 | 580 | |
a0efb80c | 581 | u32_clear_hnode(tp, ht); |
1da177e4 | 582 | |
1ce87720 JF |
583 | hn = &tp_c->hlist; |
584 | for (phn = rtnl_dereference(*hn); | |
585 | phn; | |
586 | hn = &phn->next, phn = rtnl_dereference(*hn)) { | |
587 | if (phn == ht) { | |
a1b7c5fd | 588 | u32_clear_hw_hnode(tp, ht); |
1ce87720 JF |
589 | RCU_INIT_POINTER(*hn, ht->next); |
590 | kfree_rcu(ht, rcu); | |
1da177e4 LT |
591 | return 0; |
592 | } | |
593 | } | |
594 | ||
1da177e4 LT |
595 | return -ENOENT; |
596 | } | |
597 | ||
1e052be6 CW |
598 | static bool ht_empty(struct tc_u_hnode *ht) |
599 | { | |
600 | unsigned int h; | |
601 | ||
602 | for (h = 0; h <= ht->divisor; h++) | |
603 | if (rcu_access_pointer(ht->ht[h])) | |
604 | return false; | |
605 | ||
606 | return true; | |
607 | } | |
608 | ||
763dbf63 | 609 | static void u32_destroy(struct tcf_proto *tp) |
1da177e4 LT |
610 | { |
611 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 | 612 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 | 613 | |
547b792c | 614 | WARN_ON(root_ht == NULL); |
1da177e4 LT |
615 | |
616 | if (root_ht && --root_ht->refcnt == 0) | |
617 | u32_destroy_hnode(tp, root_ht); | |
618 | ||
619 | if (--tp_c->refcnt == 0) { | |
620 | struct tc_u_hnode *ht; | |
1da177e4 | 621 | |
3cd904ec | 622 | hlist_del(&tp_c->hnode); |
1da177e4 | 623 | |
1ce87720 JF |
624 | for (ht = rtnl_dereference(tp_c->hlist); |
625 | ht; | |
626 | ht = rtnl_dereference(ht->next)) { | |
e56cfad1 | 627 | ht->refcnt--; |
a0efb80c | 628 | u32_clear_hnode(tp, ht); |
e56cfad1 | 629 | } |
1da177e4 | 630 | |
1ce87720 JF |
631 | while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) { |
632 | RCU_INIT_POINTER(tp_c->hlist, ht->next); | |
633 | kfree_rcu(ht, rcu); | |
3ff50b79 | 634 | } |
1da177e4 LT |
635 | |
636 | kfree(tp_c); | |
637 | } | |
638 | ||
639 | tp->data = NULL; | |
640 | } | |
641 | ||
8113c095 | 642 | static int u32_delete(struct tcf_proto *tp, void *arg, bool *last) |
1da177e4 | 643 | { |
8113c095 | 644 | struct tc_u_hnode *ht = arg; |
1ce87720 | 645 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
763dbf63 WC |
646 | struct tc_u_common *tp_c = tp->data; |
647 | int ret = 0; | |
1da177e4 LT |
648 | |
649 | if (ht == NULL) | |
763dbf63 | 650 | goto out; |
1da177e4 | 651 | |
a1b7c5fd JF |
652 | if (TC_U32_KEY(ht->handle)) { |
653 | u32_remove_hw_knode(tp, ht->handle); | |
763dbf63 WC |
654 | ret = u32_delete_key(tp, (struct tc_u_knode *)ht); |
655 | goto out; | |
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 | 667 | |
763dbf63 WC |
668 | out: |
669 | *last = true; | |
670 | if (root_ht) { | |
671 | if (root_ht->refcnt > 1) { | |
672 | *last = false; | |
673 | goto ret; | |
674 | } | |
675 | if (root_ht->refcnt == 1) { | |
676 | if (!ht_empty(root_ht)) { | |
677 | *last = false; | |
678 | goto ret; | |
679 | } | |
680 | } | |
681 | } | |
682 | ||
683 | if (tp_c->refcnt > 1) { | |
684 | *last = false; | |
685 | goto ret; | |
686 | } | |
687 | ||
688 | if (tp_c->refcnt == 1) { | |
689 | struct tc_u_hnode *ht; | |
690 | ||
691 | for (ht = rtnl_dereference(tp_c->hlist); | |
692 | ht; | |
693 | ht = rtnl_dereference(ht->next)) | |
694 | if (!ht_empty(ht)) { | |
695 | *last = false; | |
696 | break; | |
697 | } | |
698 | } | |
699 | ||
700 | ret: | |
701 | return ret; | |
1da177e4 LT |
702 | } |
703 | ||
7801db8a | 704 | #define NR_U32_NODE (1<<12) |
1da177e4 LT |
705 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 handle) |
706 | { | |
707 | struct tc_u_knode *n; | |
7801db8a CW |
708 | unsigned long i; |
709 | unsigned long *bitmap = kzalloc(BITS_TO_LONGS(NR_U32_NODE) * sizeof(unsigned long), | |
710 | GFP_KERNEL); | |
711 | if (!bitmap) | |
712 | return handle | 0xFFF; | |
1da177e4 | 713 | |
1ce87720 JF |
714 | for (n = rtnl_dereference(ht->ht[TC_U32_HASH(handle)]); |
715 | n; | |
716 | n = rtnl_dereference(n->next)) | |
7801db8a | 717 | set_bit(TC_U32_NODE(n->handle), bitmap); |
1da177e4 | 718 | |
7801db8a CW |
719 | i = find_next_zero_bit(bitmap, NR_U32_NODE, 0x800); |
720 | if (i >= NR_U32_NODE) | |
721 | i = find_next_zero_bit(bitmap, NR_U32_NODE, 1); | |
722 | ||
723 | kfree(bitmap); | |
724 | return handle | (i >= NR_U32_NODE ? 0xFFF : i); | |
1da177e4 LT |
725 | } |
726 | ||
6fa8c014 PM |
727 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
728 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
729 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
730 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
731 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
732 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
733 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
734 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
9e8ce79c | 735 | [TCA_U32_FLAGS] = { .type = NLA_U32 }, |
6fa8c014 PM |
736 | }; |
737 | ||
c1b52739 BL |
738 | static int u32_set_parms(struct net *net, struct tcf_proto *tp, |
739 | unsigned long base, struct tc_u_hnode *ht, | |
add93b61 | 740 | struct tc_u_knode *n, struct nlattr **tb, |
2f7ef2f8 | 741 | struct nlattr *est, bool ovr) |
1da177e4 | 742 | { |
b9a24bb7 | 743 | int err; |
1da177e4 | 744 | |
705c7091 | 745 | err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr); |
1da177e4 LT |
746 | if (err < 0) |
747 | return err; | |
748 | ||
add93b61 | 749 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 750 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 751 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 LT |
752 | |
753 | if (TC_U32_KEY(handle)) | |
705c7091 | 754 | return -EINVAL; |
1da177e4 LT |
755 | |
756 | if (handle) { | |
757 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
758 | ||
759 | if (ht_down == NULL) | |
705c7091 | 760 | return -EINVAL; |
1da177e4 LT |
761 | ht_down->refcnt++; |
762 | } | |
763 | ||
1ce87720 JF |
764 | ht_old = rtnl_dereference(n->ht_down); |
765 | rcu_assign_pointer(n->ht_down, ht_down); | |
1da177e4 | 766 | |
47a1a1d4 PM |
767 | if (ht_old) |
768 | ht_old->refcnt--; | |
1da177e4 | 769 | } |
add93b61 | 770 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 771 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
772 | tcf_bind_filter(tp, &n->res, base); |
773 | } | |
774 | ||
775 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 776 | if (tb[TCA_U32_INDEV]) { |
2519a602 WC |
777 | int ret; |
778 | ret = tcf_change_indev(net, tb[TCA_U32_INDEV]); | |
779 | if (ret < 0) | |
705c7091 | 780 | return -EINVAL; |
2519a602 | 781 | n->ifindex = ret; |
1da177e4 LT |
782 | } |
783 | #endif | |
1da177e4 | 784 | return 0; |
1da177e4 LT |
785 | } |
786 | ||
5a7a5555 | 787 | static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c, |
de5df632 JF |
788 | struct tc_u_knode *n) |
789 | { | |
790 | struct tc_u_knode __rcu **ins; | |
791 | struct tc_u_knode *pins; | |
792 | struct tc_u_hnode *ht; | |
793 | ||
794 | if (TC_U32_HTID(n->handle) == TC_U32_ROOT) | |
795 | ht = rtnl_dereference(tp->root); | |
796 | else | |
797 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle)); | |
798 | ||
799 | ins = &ht->ht[TC_U32_HASH(n->handle)]; | |
800 | ||
801 | /* The node must always exist for it to be replaced if this is not the | |
802 | * case then something went very wrong elsewhere. | |
803 | */ | |
804 | for (pins = rtnl_dereference(*ins); ; | |
805 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
806 | if (pins->handle == n->handle) | |
807 | break; | |
808 | ||
809 | RCU_INIT_POINTER(n->next, pins->next); | |
810 | rcu_assign_pointer(*ins, n); | |
811 | } | |
812 | ||
813 | static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp, | |
814 | struct tc_u_knode *n) | |
815 | { | |
816 | struct tc_u_knode *new; | |
817 | struct tc_u32_sel *s = &n->sel; | |
818 | ||
819 | new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), | |
820 | GFP_KERNEL); | |
821 | ||
822 | if (!new) | |
823 | return NULL; | |
824 | ||
825 | RCU_INIT_POINTER(new->next, n->next); | |
826 | new->handle = n->handle; | |
827 | RCU_INIT_POINTER(new->ht_up, n->ht_up); | |
828 | ||
829 | #ifdef CONFIG_NET_CLS_IND | |
830 | new->ifindex = n->ifindex; | |
831 | #endif | |
832 | new->fshift = n->fshift; | |
833 | new->res = n->res; | |
9e8ce79c | 834 | new->flags = n->flags; |
de5df632 JF |
835 | RCU_INIT_POINTER(new->ht_down, n->ht_down); |
836 | ||
837 | /* bump reference count as long as we hold pointer to structure */ | |
838 | if (new->ht_down) | |
839 | new->ht_down->refcnt++; | |
840 | ||
841 | #ifdef CONFIG_CLS_U32_PERF | |
842 | /* Statistics may be incremented by readers during update | |
843 | * so we must keep them in tact. When the node is later destroyed | |
844 | * a special destroy call must be made to not free the pf memory. | |
845 | */ | |
846 | new->pf = n->pf; | |
847 | #endif | |
848 | ||
849 | #ifdef CONFIG_CLS_U32_MARK | |
850 | new->val = n->val; | |
851 | new->mask = n->mask; | |
852 | /* Similarly success statistics must be moved as pointers */ | |
853 | new->pcpu_success = n->pcpu_success; | |
854 | #endif | |
855 | new->tp = tp; | |
856 | memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
857 | ||
b9a24bb7 WC |
858 | if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) { |
859 | kfree(new); | |
860 | return NULL; | |
861 | } | |
de5df632 JF |
862 | |
863 | return new; | |
864 | } | |
865 | ||
c1b52739 | 866 | static int u32_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 867 | struct tcf_proto *tp, unsigned long base, u32 handle, |
8113c095 | 868 | struct nlattr **tca, void **arg, bool ovr) |
1da177e4 LT |
869 | { |
870 | struct tc_u_common *tp_c = tp->data; | |
871 | struct tc_u_hnode *ht; | |
872 | struct tc_u_knode *n; | |
873 | struct tc_u32_sel *s; | |
add93b61 PM |
874 | struct nlattr *opt = tca[TCA_OPTIONS]; |
875 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
9e8ce79c | 876 | u32 htid, flags = 0; |
1da177e4 | 877 | int err; |
459d5f62 JF |
878 | #ifdef CONFIG_CLS_U32_PERF |
879 | size_t size; | |
880 | #endif | |
1da177e4 LT |
881 | |
882 | if (opt == NULL) | |
883 | return handle ? -EINVAL : 0; | |
884 | ||
fceb6435 | 885 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, NULL); |
cee63723 PM |
886 | if (err < 0) |
887 | return err; | |
1da177e4 | 888 | |
d34e3e18 | 889 | if (tb[TCA_U32_FLAGS]) { |
9e8ce79c | 890 | flags = nla_get_u32(tb[TCA_U32_FLAGS]); |
d34e3e18 | 891 | if (!tc_flags_valid(flags)) |
1a0f7d29 | 892 | return -EINVAL; |
d34e3e18 | 893 | } |
9e8ce79c | 894 | |
8113c095 | 895 | n = *arg; |
cc7ec456 | 896 | if (n) { |
de5df632 JF |
897 | struct tc_u_knode *new; |
898 | ||
1da177e4 LT |
899 | if (TC_U32_KEY(n->handle) == 0) |
900 | return -EINVAL; | |
901 | ||
9e8ce79c JF |
902 | if (n->flags != flags) |
903 | return -EINVAL; | |
904 | ||
de5df632 JF |
905 | new = u32_init_knode(tp, n); |
906 | if (!new) | |
907 | return -ENOMEM; | |
908 | ||
909 | err = u32_set_parms(net, tp, base, | |
910 | rtnl_dereference(n->ht_up), new, tb, | |
911 | tca[TCA_RATE], ovr); | |
912 | ||
913 | if (err) { | |
914 | u32_destroy_key(tp, new, false); | |
915 | return err; | |
916 | } | |
917 | ||
d34e3e18 SS |
918 | err = u32_replace_hw_knode(tp, new, flags); |
919 | if (err) { | |
920 | u32_destroy_key(tp, new, false); | |
921 | return err; | |
922 | } | |
923 | ||
24d3dc6d OG |
924 | if (!tc_in_hw(new->flags)) |
925 | new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
926 | ||
de5df632 | 927 | u32_replace_knode(tp, tp_c, new); |
a0efb80c | 928 | tcf_unbind_filter(tp, &n->res); |
de5df632 JF |
929 | call_rcu(&n->rcu, u32_delete_key_rcu); |
930 | return 0; | |
1da177e4 LT |
931 | } |
932 | ||
add93b61 | 933 | if (tb[TCA_U32_DIVISOR]) { |
cc7ec456 | 934 | unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); |
1da177e4 LT |
935 | |
936 | if (--divisor > 0x100) | |
937 | return -EINVAL; | |
938 | if (TC_U32_KEY(handle)) | |
939 | return -EINVAL; | |
940 | if (handle == 0) { | |
941 | handle = gen_new_htid(tp->data); | |
942 | if (handle == 0) | |
943 | return -ENOMEM; | |
944 | } | |
cc7ec456 | 945 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); |
1da177e4 LT |
946 | if (ht == NULL) |
947 | return -ENOBUFS; | |
1da177e4 | 948 | ht->tp_c = tp_c; |
e56cfad1 | 949 | ht->refcnt = 1; |
1da177e4 LT |
950 | ht->divisor = divisor; |
951 | ht->handle = handle; | |
952 | ht->prio = tp->prio; | |
6eef3801 JK |
953 | |
954 | err = u32_replace_hw_hnode(tp, ht, flags); | |
955 | if (err) { | |
956 | kfree(ht); | |
957 | return err; | |
958 | } | |
959 | ||
1ce87720 JF |
960 | RCU_INIT_POINTER(ht->next, tp_c->hlist); |
961 | rcu_assign_pointer(tp_c->hlist, ht); | |
8113c095 | 962 | *arg = ht; |
a1b7c5fd | 963 | |
1da177e4 LT |
964 | return 0; |
965 | } | |
966 | ||
add93b61 | 967 | if (tb[TCA_U32_HASH]) { |
1587bac4 | 968 | htid = nla_get_u32(tb[TCA_U32_HASH]); |
1da177e4 | 969 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
1ce87720 | 970 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
971 | htid = ht->handle; |
972 | } else { | |
973 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
974 | if (ht == NULL) | |
975 | return -EINVAL; | |
976 | } | |
977 | } else { | |
1ce87720 | 978 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
979 | htid = ht->handle; |
980 | } | |
981 | ||
982 | if (ht->divisor < TC_U32_HASH(htid)) | |
983 | return -EINVAL; | |
984 | ||
985 | if (handle) { | |
986 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle^htid)) | |
987 | return -EINVAL; | |
988 | handle = htid | TC_U32_NODE(handle); | |
989 | } else | |
990 | handle = gen_new_kid(ht, htid); | |
991 | ||
6fa8c014 | 992 | if (tb[TCA_U32_SEL] == NULL) |
1da177e4 LT |
993 | return -EINVAL; |
994 | ||
add93b61 | 995 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 996 | |
0da974f4 | 997 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
1da177e4 LT |
998 | if (n == NULL) |
999 | return -ENOBUFS; | |
1000 | ||
1da177e4 | 1001 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 JF |
1002 | size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64); |
1003 | n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt)); | |
1004 | if (!n->pf) { | |
1da177e4 LT |
1005 | kfree(n); |
1006 | return -ENOBUFS; | |
1007 | } | |
1da177e4 LT |
1008 | #endif |
1009 | ||
1010 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
a96366bf | 1011 | RCU_INIT_POINTER(n->ht_up, ht); |
1da177e4 | 1012 | n->handle = handle; |
b2268016 | 1013 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
9e8ce79c | 1014 | n->flags = flags; |
1ce87720 | 1015 | n->tp = tp; |
1da177e4 | 1016 | |
b9a24bb7 WC |
1017 | err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE); |
1018 | if (err < 0) | |
1019 | goto errout; | |
1020 | ||
1da177e4 | 1021 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 | 1022 | n->pcpu_success = alloc_percpu(u32); |
a1ddcfee JF |
1023 | if (!n->pcpu_success) { |
1024 | err = -ENOMEM; | |
1025 | goto errout; | |
1026 | } | |
459d5f62 | 1027 | |
add93b61 | 1028 | if (tb[TCA_U32_MARK]) { |
1da177e4 LT |
1029 | struct tc_u32_mark *mark; |
1030 | ||
add93b61 | 1031 | mark = nla_data(tb[TCA_U32_MARK]); |
459d5f62 JF |
1032 | n->val = mark->val; |
1033 | n->mask = mark->mask; | |
1da177e4 LT |
1034 | } |
1035 | #endif | |
1036 | ||
2f7ef2f8 | 1037 | err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr); |
1da177e4 | 1038 | if (err == 0) { |
1ce87720 JF |
1039 | struct tc_u_knode __rcu **ins; |
1040 | struct tc_u_knode *pins; | |
1041 | ||
d34e3e18 SS |
1042 | err = u32_replace_hw_knode(tp, n, flags); |
1043 | if (err) | |
1044 | goto errhw; | |
1045 | ||
24d3dc6d OG |
1046 | if (!tc_in_hw(n->flags)) |
1047 | n->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
1048 | ||
1ce87720 JF |
1049 | ins = &ht->ht[TC_U32_HASH(handle)]; |
1050 | for (pins = rtnl_dereference(*ins); pins; | |
1051 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
1052 | if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle)) | |
1da177e4 LT |
1053 | break; |
1054 | ||
1ce87720 JF |
1055 | RCU_INIT_POINTER(n->next, pins); |
1056 | rcu_assign_pointer(*ins, n); | |
8113c095 | 1057 | *arg = n; |
1da177e4 LT |
1058 | return 0; |
1059 | } | |
a1ddcfee | 1060 | |
d34e3e18 | 1061 | errhw: |
a1ddcfee JF |
1062 | #ifdef CONFIG_CLS_U32_MARK |
1063 | free_percpu(n->pcpu_success); | |
1064 | #endif | |
1065 | ||
b9a24bb7 WC |
1066 | errout: |
1067 | tcf_exts_destroy(&n->exts); | |
1da177e4 | 1068 | #ifdef CONFIG_CLS_U32_PERF |
1ce87720 | 1069 | free_percpu(n->pf); |
1da177e4 LT |
1070 | #endif |
1071 | kfree(n); | |
1072 | return err; | |
1073 | } | |
1074 | ||
1075 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
1076 | { | |
1077 | struct tc_u_common *tp_c = tp->data; | |
1078 | struct tc_u_hnode *ht; | |
1079 | struct tc_u_knode *n; | |
cc7ec456 | 1080 | unsigned int h; |
1da177e4 LT |
1081 | |
1082 | if (arg->stop) | |
1083 | return; | |
1084 | ||
1ce87720 JF |
1085 | for (ht = rtnl_dereference(tp_c->hlist); |
1086 | ht; | |
1087 | ht = rtnl_dereference(ht->next)) { | |
1da177e4 LT |
1088 | if (ht->prio != tp->prio) |
1089 | continue; | |
1090 | if (arg->count >= arg->skip) { | |
8113c095 | 1091 | if (arg->fn(tp, ht, arg) < 0) { |
1da177e4 LT |
1092 | arg->stop = 1; |
1093 | return; | |
1094 | } | |
1095 | } | |
1096 | arg->count++; | |
1097 | for (h = 0; h <= ht->divisor; h++) { | |
1ce87720 JF |
1098 | for (n = rtnl_dereference(ht->ht[h]); |
1099 | n; | |
1100 | n = rtnl_dereference(n->next)) { | |
1da177e4 LT |
1101 | if (arg->count < arg->skip) { |
1102 | arg->count++; | |
1103 | continue; | |
1104 | } | |
8113c095 | 1105 | if (arg->fn(tp, n, arg) < 0) { |
1da177e4 LT |
1106 | arg->stop = 1; |
1107 | return; | |
1108 | } | |
1109 | arg->count++; | |
1110 | } | |
1111 | } | |
1112 | } | |
1113 | } | |
1114 | ||
8113c095 | 1115 | static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh, |
5a7a5555 | 1116 | struct sk_buff *skb, struct tcmsg *t) |
1da177e4 | 1117 | { |
8113c095 | 1118 | struct tc_u_knode *n = fh; |
1ce87720 | 1119 | struct tc_u_hnode *ht_up, *ht_down; |
4b3550ef | 1120 | struct nlattr *nest; |
1da177e4 LT |
1121 | |
1122 | if (n == NULL) | |
1123 | return skb->len; | |
1124 | ||
1125 | t->tcm_handle = n->handle; | |
1126 | ||
4b3550ef PM |
1127 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1128 | if (nest == NULL) | |
1129 | goto nla_put_failure; | |
1da177e4 LT |
1130 | |
1131 | if (TC_U32_KEY(n->handle) == 0) { | |
8113c095 | 1132 | struct tc_u_hnode *ht = fh; |
cc7ec456 ED |
1133 | u32 divisor = ht->divisor + 1; |
1134 | ||
1b34ec43 DM |
1135 | if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) |
1136 | goto nla_put_failure; | |
1da177e4 | 1137 | } else { |
459d5f62 JF |
1138 | #ifdef CONFIG_CLS_U32_PERF |
1139 | struct tc_u32_pcnt *gpf; | |
459d5f62 | 1140 | int cpu; |
80aab73d | 1141 | #endif |
459d5f62 | 1142 | |
1b34ec43 DM |
1143 | if (nla_put(skb, TCA_U32_SEL, |
1144 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
1145 | &n->sel)) | |
1146 | goto nla_put_failure; | |
1ce87720 JF |
1147 | |
1148 | ht_up = rtnl_dereference(n->ht_up); | |
1149 | if (ht_up) { | |
1da177e4 | 1150 | u32 htid = n->handle & 0xFFFFF000; |
1b34ec43 DM |
1151 | if (nla_put_u32(skb, TCA_U32_HASH, htid)) |
1152 | goto nla_put_failure; | |
1da177e4 | 1153 | } |
1b34ec43 DM |
1154 | if (n->res.classid && |
1155 | nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) | |
1156 | goto nla_put_failure; | |
1ce87720 JF |
1157 | |
1158 | ht_down = rtnl_dereference(n->ht_down); | |
1159 | if (ht_down && | |
1160 | nla_put_u32(skb, TCA_U32_LINK, ht_down->handle)) | |
1b34ec43 | 1161 | goto nla_put_failure; |
1da177e4 | 1162 | |
9e8ce79c JF |
1163 | if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags)) |
1164 | goto nla_put_failure; | |
1165 | ||
1da177e4 | 1166 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 JF |
1167 | if ((n->val || n->mask)) { |
1168 | struct tc_u32_mark mark = {.val = n->val, | |
1169 | .mask = n->mask, | |
1170 | .success = 0}; | |
80aab73d | 1171 | int cpum; |
459d5f62 | 1172 | |
80aab73d JF |
1173 | for_each_possible_cpu(cpum) { |
1174 | __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum); | |
459d5f62 JF |
1175 | |
1176 | mark.success += cnt; | |
1177 | } | |
1178 | ||
1179 | if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark)) | |
1180 | goto nla_put_failure; | |
1181 | } | |
1da177e4 LT |
1182 | #endif |
1183 | ||
5da57f42 | 1184 | if (tcf_exts_dump(skb, &n->exts) < 0) |
add93b61 | 1185 | goto nla_put_failure; |
1da177e4 LT |
1186 | |
1187 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 WC |
1188 | if (n->ifindex) { |
1189 | struct net_device *dev; | |
1190 | dev = __dev_get_by_index(net, n->ifindex); | |
1191 | if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) | |
1192 | goto nla_put_failure; | |
1193 | } | |
1da177e4 LT |
1194 | #endif |
1195 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 JF |
1196 | gpf = kzalloc(sizeof(struct tc_u32_pcnt) + |
1197 | n->sel.nkeys * sizeof(u64), | |
1198 | GFP_KERNEL); | |
1199 | if (!gpf) | |
1200 | goto nla_put_failure; | |
1201 | ||
1202 | for_each_possible_cpu(cpu) { | |
1203 | int i; | |
1204 | struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu); | |
1205 | ||
1206 | gpf->rcnt += pf->rcnt; | |
1207 | gpf->rhit += pf->rhit; | |
1208 | for (i = 0; i < n->sel.nkeys; i++) | |
1209 | gpf->kcnts[i] += pf->kcnts[i]; | |
1210 | } | |
1211 | ||
9854518e ND |
1212 | if (nla_put_64bit(skb, TCA_U32_PCNT, |
1213 | sizeof(struct tc_u32_pcnt) + | |
1214 | n->sel.nkeys * sizeof(u64), | |
1215 | gpf, TCA_U32_PAD)) { | |
459d5f62 | 1216 | kfree(gpf); |
1b34ec43 | 1217 | goto nla_put_failure; |
459d5f62 JF |
1218 | } |
1219 | kfree(gpf); | |
1da177e4 LT |
1220 | #endif |
1221 | } | |
1222 | ||
4b3550ef PM |
1223 | nla_nest_end(skb, nest); |
1224 | ||
1da177e4 | 1225 | if (TC_U32_KEY(n->handle)) |
5da57f42 | 1226 | if (tcf_exts_dump_stats(skb, &n->exts) < 0) |
add93b61 | 1227 | goto nla_put_failure; |
1da177e4 LT |
1228 | return skb->len; |
1229 | ||
add93b61 | 1230 | nla_put_failure: |
4b3550ef | 1231 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1232 | return -1; |
1233 | } | |
1234 | ||
2eb9d75c | 1235 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
1236 | .kind = "u32", |
1237 | .classify = u32_classify, | |
1238 | .init = u32_init, | |
1239 | .destroy = u32_destroy, | |
1240 | .get = u32_get, | |
1da177e4 LT |
1241 | .change = u32_change, |
1242 | .delete = u32_delete, | |
1243 | .walk = u32_walk, | |
1244 | .dump = u32_dump, | |
1245 | .owner = THIS_MODULE, | |
1246 | }; | |
1247 | ||
1248 | static int __init init_u32(void) | |
1249 | { | |
3cd904ec WC |
1250 | int i, ret; |
1251 | ||
6ff9c364 | 1252 | pr_info("u32 classifier\n"); |
1da177e4 | 1253 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 1254 | pr_info(" Performance counters on\n"); |
1da177e4 | 1255 | #endif |
1da177e4 | 1256 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 1257 | pr_info(" input device check on\n"); |
1da177e4 LT |
1258 | #endif |
1259 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 1260 | pr_info(" Actions configured\n"); |
1da177e4 | 1261 | #endif |
3cd904ec WC |
1262 | tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE, |
1263 | sizeof(struct hlist_head), | |
1264 | GFP_KERNEL); | |
1265 | if (!tc_u_common_hash) | |
1266 | return -ENOMEM; | |
1267 | ||
1268 | for (i = 0; i < U32_HASH_SIZE; i++) | |
1269 | INIT_HLIST_HEAD(&tc_u_common_hash[i]); | |
1270 | ||
1271 | ret = register_tcf_proto_ops(&cls_u32_ops); | |
1272 | if (ret) | |
1273 | kvfree(tc_u_common_hash); | |
1274 | return ret; | |
1da177e4 LT |
1275 | } |
1276 | ||
10297b99 | 1277 | static void __exit exit_u32(void) |
1da177e4 LT |
1278 | { |
1279 | unregister_tcf_proto_ops(&cls_u32_ops); | |
3cd904ec | 1280 | kvfree(tc_u_common_hash); |
1da177e4 LT |
1281 | } |
1282 | ||
1283 | module_init(init_u32) | |
1284 | module_exit(exit_u32) | |
1285 | MODULE_LICENSE("GPL"); |