]>
Commit | Line | Data |
---|---|---|
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; |
aaa908ff | 71 | struct rcu_work rwork; |
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; |
e7614370 | 85 | struct idr handle_idr; |
1ce87720 | 86 | struct rcu_head rcu; |
f40fe58d | 87 | u32 flags; |
5778d39d WC |
88 | /* The 'ht' field MUST be the last field in structure to allow for |
89 | * more entries allocated at end of structure. | |
90 | */ | |
91 | struct tc_u_knode __rcu *ht[1]; | |
1da177e4 LT |
92 | }; |
93 | ||
cc7ec456 | 94 | struct tc_u_common { |
1ce87720 | 95 | struct tc_u_hnode __rcu *hlist; |
339c21d7 | 96 | void *ptr; |
1da177e4 | 97 | int refcnt; |
e7614370 | 98 | struct idr handle_idr; |
3cd904ec | 99 | struct hlist_node hnode; |
1ce87720 | 100 | struct rcu_head rcu; |
1da177e4 LT |
101 | }; |
102 | ||
cc7ec456 ED |
103 | static inline unsigned int u32_hash_fold(__be32 key, |
104 | const struct tc_u32_sel *sel, | |
105 | u8 fshift) | |
1da177e4 | 106 | { |
cc7ec456 | 107 | unsigned int h = ntohl(key & sel->hmask) >> fshift; |
1da177e4 LT |
108 | |
109 | return h; | |
110 | } | |
111 | ||
5a7a5555 JHS |
112 | static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
113 | struct tcf_result *res) | |
1da177e4 LT |
114 | { |
115 | struct { | |
116 | struct tc_u_knode *knode; | |
fbc2e7d9 | 117 | unsigned int off; |
1da177e4 LT |
118 | } stack[TC_U32_MAXDEPTH]; |
119 | ||
1ce87720 | 120 | struct tc_u_hnode *ht = rcu_dereference_bh(tp->root); |
fbc2e7d9 | 121 | unsigned int off = skb_network_offset(skb); |
1da177e4 LT |
122 | struct tc_u_knode *n; |
123 | int sdepth = 0; | |
124 | int off2 = 0; | |
125 | int sel = 0; | |
126 | #ifdef CONFIG_CLS_U32_PERF | |
127 | int j; | |
128 | #endif | |
129 | int i, r; | |
130 | ||
131 | next_ht: | |
1ce87720 | 132 | n = rcu_dereference_bh(ht->ht[sel]); |
1da177e4 LT |
133 | |
134 | next_knode: | |
135 | if (n) { | |
136 | struct tc_u32_key *key = n->sel.keys; | |
137 | ||
138 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 139 | __this_cpu_inc(n->pf->rcnt); |
1da177e4 LT |
140 | j = 0; |
141 | #endif | |
142 | ||
d34e3e18 SS |
143 | if (tc_skip_sw(n->flags)) { |
144 | n = rcu_dereference_bh(n->next); | |
145 | goto next_knode; | |
146 | } | |
147 | ||
1da177e4 | 148 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 | 149 | if ((skb->mark & n->mask) != n->val) { |
1ce87720 | 150 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
151 | goto next_knode; |
152 | } else { | |
459d5f62 | 153 | __this_cpu_inc(*n->pcpu_success); |
1da177e4 LT |
154 | } |
155 | #endif | |
156 | ||
cc7ec456 | 157 | for (i = n->sel.nkeys; i > 0; i--, key++) { |
66d50d25 | 158 | int toff = off + key->off + (off2 & key->offmask); |
86fce3ba | 159 | __be32 *data, hdata; |
fbc2e7d9 | 160 | |
4e18b3ed | 161 | if (skb_headroom(skb) + toff > INT_MAX) |
66d50d25 | 162 | goto out; |
163 | ||
86fce3ba | 164 | data = skb_header_pointer(skb, toff, 4, &hdata); |
fbc2e7d9 CG |
165 | if (!data) |
166 | goto out; | |
167 | if ((*data ^ key->val) & key->mask) { | |
1ce87720 | 168 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
169 | goto next_knode; |
170 | } | |
171 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 172 | __this_cpu_inc(n->pf->kcnts[j]); |
1da177e4 LT |
173 | j++; |
174 | #endif | |
175 | } | |
1ce87720 JF |
176 | |
177 | ht = rcu_dereference_bh(n->ht_down); | |
178 | if (!ht) { | |
1da177e4 | 179 | check_terminal: |
cc7ec456 | 180 | if (n->sel.flags & TC_U32_TERMINAL) { |
1da177e4 LT |
181 | |
182 | *res = n->res; | |
183 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 184 | if (!tcf_match_indev(skb, n->ifindex)) { |
1ce87720 | 185 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
186 | goto next_knode; |
187 | } | |
188 | #endif | |
189 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 | 190 | __this_cpu_inc(n->pf->rhit); |
1da177e4 LT |
191 | #endif |
192 | r = tcf_exts_exec(skb, &n->exts, res); | |
193 | if (r < 0) { | |
1ce87720 | 194 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
195 | goto next_knode; |
196 | } | |
197 | ||
198 | return r; | |
199 | } | |
1ce87720 | 200 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
201 | goto next_knode; |
202 | } | |
203 | ||
204 | /* PUSH */ | |
205 | if (sdepth >= TC_U32_MAXDEPTH) | |
206 | goto deadloop; | |
207 | stack[sdepth].knode = n; | |
fbc2e7d9 | 208 | stack[sdepth].off = off; |
1da177e4 LT |
209 | sdepth++; |
210 | ||
1ce87720 | 211 | ht = rcu_dereference_bh(n->ht_down); |
1da177e4 | 212 | sel = 0; |
fbc2e7d9 | 213 | if (ht->divisor) { |
86fce3ba | 214 | __be32 *data, hdata; |
fbc2e7d9 CG |
215 | |
216 | data = skb_header_pointer(skb, off + n->sel.hoff, 4, | |
86fce3ba | 217 | &hdata); |
fbc2e7d9 CG |
218 | if (!data) |
219 | goto out; | |
220 | sel = ht->divisor & u32_hash_fold(*data, &n->sel, | |
221 | n->fshift); | |
222 | } | |
cc7ec456 | 223 | if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) |
1da177e4 LT |
224 | goto next_ht; |
225 | ||
cc7ec456 | 226 | if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { |
1da177e4 | 227 | off2 = n->sel.off + 3; |
fbc2e7d9 | 228 | if (n->sel.flags & TC_U32_VAROFFSET) { |
86fce3ba | 229 | __be16 *data, hdata; |
fbc2e7d9 CG |
230 | |
231 | data = skb_header_pointer(skb, | |
232 | off + n->sel.offoff, | |
86fce3ba | 233 | 2, &hdata); |
fbc2e7d9 CG |
234 | if (!data) |
235 | goto out; | |
236 | off2 += ntohs(n->sel.offmask & *data) >> | |
237 | n->sel.offshift; | |
238 | } | |
1da177e4 LT |
239 | off2 &= ~3; |
240 | } | |
cc7ec456 | 241 | if (n->sel.flags & TC_U32_EAT) { |
fbc2e7d9 | 242 | off += off2; |
1da177e4 LT |
243 | off2 = 0; |
244 | } | |
245 | ||
fbc2e7d9 | 246 | if (off < skb->len) |
1da177e4 LT |
247 | goto next_ht; |
248 | } | |
249 | ||
250 | /* POP */ | |
251 | if (sdepth--) { | |
252 | n = stack[sdepth].knode; | |
1ce87720 | 253 | ht = rcu_dereference_bh(n->ht_up); |
fbc2e7d9 | 254 | off = stack[sdepth].off; |
1da177e4 LT |
255 | goto check_terminal; |
256 | } | |
fbc2e7d9 | 257 | out: |
1da177e4 LT |
258 | return -1; |
259 | ||
260 | deadloop: | |
e87cc472 | 261 | net_warn_ratelimited("cls_u32: dead loop\n"); |
1da177e4 LT |
262 | return -1; |
263 | } | |
264 | ||
5a7a5555 | 265 | static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) |
1da177e4 LT |
266 | { |
267 | struct tc_u_hnode *ht; | |
268 | ||
1ce87720 JF |
269 | for (ht = rtnl_dereference(tp_c->hlist); |
270 | ht; | |
271 | ht = rtnl_dereference(ht->next)) | |
1da177e4 LT |
272 | if (ht->handle == handle) |
273 | break; | |
274 | ||
275 | return ht; | |
276 | } | |
277 | ||
5a7a5555 | 278 | static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle) |
1da177e4 | 279 | { |
cc7ec456 | 280 | unsigned int sel; |
1da177e4 LT |
281 | struct tc_u_knode *n = NULL; |
282 | ||
283 | sel = TC_U32_HASH(handle); | |
284 | if (sel > ht->divisor) | |
285 | goto out; | |
286 | ||
1ce87720 JF |
287 | for (n = rtnl_dereference(ht->ht[sel]); |
288 | n; | |
289 | n = rtnl_dereference(n->next)) | |
1da177e4 LT |
290 | if (n->handle == handle) |
291 | break; | |
292 | out: | |
293 | return n; | |
294 | } | |
295 | ||
296 | ||
8113c095 | 297 | static void *u32_get(struct tcf_proto *tp, u32 handle) |
1da177e4 LT |
298 | { |
299 | struct tc_u_hnode *ht; | |
300 | struct tc_u_common *tp_c = tp->data; | |
301 | ||
302 | if (TC_U32_HTID(handle) == TC_U32_ROOT) | |
1ce87720 | 303 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
304 | else |
305 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); | |
306 | ||
307 | if (!ht) | |
8113c095 | 308 | return NULL; |
1da177e4 LT |
309 | |
310 | if (TC_U32_KEY(handle) == 0) | |
8113c095 | 311 | return ht; |
1da177e4 | 312 | |
8113c095 | 313 | return u32_lookup_key(ht, handle); |
1da177e4 LT |
314 | } |
315 | ||
ffdc2d9e | 316 | /* Protected by rtnl lock */ |
e7614370 | 317 | static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr) |
1da177e4 | 318 | { |
ffdc2d9e MW |
319 | int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL); |
320 | if (id < 0) | |
e7614370 | 321 | return 0; |
ffdc2d9e | 322 | return (id | 0x800U) << 20; |
1da177e4 LT |
323 | } |
324 | ||
3cd904ec WC |
325 | static struct hlist_head *tc_u_common_hash; |
326 | ||
327 | #define U32_HASH_SHIFT 10 | |
328 | #define U32_HASH_SIZE (1 << U32_HASH_SHIFT) | |
329 | ||
339c21d7 JP |
330 | static void *tc_u_common_ptr(const struct tcf_proto *tp) |
331 | { | |
332 | struct tcf_block *block = tp->chain->block; | |
333 | ||
334 | /* The block sharing is currently supported only | |
335 | * for classless qdiscs. In that case we use block | |
336 | * for tc_u_common identification. In case the | |
337 | * block is not shared, block->q is a valid pointer | |
338 | * and we can use that. That works for classful qdiscs. | |
339 | */ | |
340 | if (tcf_block_shared(block)) | |
341 | return block; | |
342 | else | |
343 | return block->q; | |
344 | } | |
345 | ||
3cd904ec WC |
346 | static unsigned int tc_u_hash(const struct tcf_proto *tp) |
347 | { | |
339c21d7 | 348 | return hash_ptr(tc_u_common_ptr(tp), U32_HASH_SHIFT); |
3cd904ec WC |
349 | } |
350 | ||
351 | static struct tc_u_common *tc_u_common_find(const struct tcf_proto *tp) | |
352 | { | |
353 | struct tc_u_common *tc; | |
354 | unsigned int h; | |
355 | ||
356 | h = tc_u_hash(tp); | |
357 | hlist_for_each_entry(tc, &tc_u_common_hash[h], hnode) { | |
339c21d7 | 358 | if (tc->ptr == tc_u_common_ptr(tp)) |
3cd904ec WC |
359 | return tc; |
360 | } | |
361 | return NULL; | |
362 | } | |
363 | ||
1da177e4 LT |
364 | static int u32_init(struct tcf_proto *tp) |
365 | { | |
366 | struct tc_u_hnode *root_ht; | |
367 | struct tc_u_common *tp_c; | |
3cd904ec | 368 | unsigned int h; |
1da177e4 | 369 | |
3cd904ec | 370 | tp_c = tc_u_common_find(tp); |
1da177e4 | 371 | |
0da974f4 | 372 | root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); |
1da177e4 LT |
373 | if (root_ht == NULL) |
374 | return -ENOBUFS; | |
375 | ||
1da177e4 | 376 | root_ht->refcnt++; |
e7614370 | 377 | root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000; |
1da177e4 | 378 | root_ht->prio = tp->prio; |
e7614370 | 379 | idr_init(&root_ht->handle_idr); |
1da177e4 LT |
380 | |
381 | if (tp_c == NULL) { | |
0da974f4 | 382 | tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); |
1da177e4 LT |
383 | if (tp_c == NULL) { |
384 | kfree(root_ht); | |
385 | return -ENOBUFS; | |
386 | } | |
339c21d7 | 387 | tp_c->ptr = tc_u_common_ptr(tp); |
3cd904ec | 388 | INIT_HLIST_NODE(&tp_c->hnode); |
e7614370 | 389 | idr_init(&tp_c->handle_idr); |
3cd904ec WC |
390 | |
391 | h = tc_u_hash(tp); | |
392 | hlist_add_head(&tp_c->hnode, &tc_u_common_hash[h]); | |
1da177e4 LT |
393 | } |
394 | ||
395 | tp_c->refcnt++; | |
1ce87720 JF |
396 | RCU_INIT_POINTER(root_ht->next, tp_c->hlist); |
397 | rcu_assign_pointer(tp_c->hlist, root_ht); | |
1da177e4 LT |
398 | root_ht->tp_c = tp_c; |
399 | ||
1ce87720 | 400 | rcu_assign_pointer(tp->root, root_ht); |
1da177e4 LT |
401 | tp->data = tp_c; |
402 | return 0; | |
403 | } | |
404 | ||
5a7a5555 | 405 | static int u32_destroy_key(struct tcf_proto *tp, struct tc_u_knode *n, |
de5df632 | 406 | bool free_pf) |
1da177e4 | 407 | { |
d7cdee5e PA |
408 | struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); |
409 | ||
18d0264f | 410 | tcf_exts_destroy(&n->exts); |
35c55fc1 | 411 | tcf_exts_put_net(&n->exts); |
d7cdee5e PA |
412 | if (ht && --ht->refcnt == 0) |
413 | kfree(ht); | |
1da177e4 | 414 | #ifdef CONFIG_CLS_U32_PERF |
de5df632 JF |
415 | if (free_pf) |
416 | free_percpu(n->pf); | |
a1ddcfee JF |
417 | #endif |
418 | #ifdef CONFIG_CLS_U32_MARK | |
de5df632 JF |
419 | if (free_pf) |
420 | free_percpu(n->pcpu_success); | |
1da177e4 LT |
421 | #endif |
422 | kfree(n); | |
423 | return 0; | |
424 | } | |
425 | ||
de5df632 JF |
426 | /* u32_delete_key_rcu should be called when free'ing a copied |
427 | * version of a tc_u_knode obtained from u32_init_knode(). When | |
428 | * copies are obtained from u32_init_knode() the statistics are | |
429 | * shared between the old and new copies to allow readers to | |
430 | * continue to update the statistics during the copy. To support | |
431 | * this the u32_delete_key_rcu variant does not free the percpu | |
432 | * statistics. | |
433 | */ | |
c0d378ef CW |
434 | static void u32_delete_key_work(struct work_struct *work) |
435 | { | |
aaa908ff CW |
436 | struct tc_u_knode *key = container_of(to_rcu_work(work), |
437 | struct tc_u_knode, | |
438 | rwork); | |
c0d378ef CW |
439 | rtnl_lock(); |
440 | u32_destroy_key(key->tp, key, false); | |
441 | rtnl_unlock(); | |
442 | } | |
443 | ||
de5df632 JF |
444 | /* u32_delete_key_freepf_rcu is the rcu callback variant |
445 | * that free's the entire structure including the statistics | |
446 | * percpu variables. Only use this if the key is not a copy | |
447 | * returned by u32_init_knode(). See u32_delete_key_rcu() | |
448 | * for the variant that should be used with keys return from | |
449 | * u32_init_knode() | |
450 | */ | |
c0d378ef CW |
451 | static void u32_delete_key_freepf_work(struct work_struct *work) |
452 | { | |
aaa908ff CW |
453 | struct tc_u_knode *key = container_of(to_rcu_work(work), |
454 | struct tc_u_knode, | |
455 | rwork); | |
c0d378ef CW |
456 | rtnl_lock(); |
457 | u32_destroy_key(key->tp, key, true); | |
458 | rtnl_unlock(); | |
459 | } | |
460 | ||
82d567c2 | 461 | static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) |
1da177e4 | 462 | { |
1ce87720 JF |
463 | struct tc_u_knode __rcu **kp; |
464 | struct tc_u_knode *pkp; | |
a96366bf | 465 | struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); |
1da177e4 LT |
466 | |
467 | if (ht) { | |
1ce87720 JF |
468 | kp = &ht->ht[TC_U32_HASH(key->handle)]; |
469 | for (pkp = rtnl_dereference(*kp); pkp; | |
470 | kp = &pkp->next, pkp = rtnl_dereference(*kp)) { | |
471 | if (pkp == key) { | |
472 | RCU_INIT_POINTER(*kp, key->next); | |
1da177e4 | 473 | |
a0efb80c | 474 | tcf_unbind_filter(tp, &key->res); |
f12c6432 | 475 | idr_remove(&ht->handle_idr, key->handle); |
35c55fc1 | 476 | tcf_exts_get_net(&key->exts); |
aaa908ff | 477 | tcf_queue_work(&key->rwork, u32_delete_key_freepf_work); |
1da177e4 LT |
478 | return 0; |
479 | } | |
480 | } | |
481 | } | |
547b792c | 482 | WARN_ON(1); |
1da177e4 LT |
483 | return 0; |
484 | } | |
485 | ||
458e704d JK |
486 | static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h, |
487 | struct netlink_ext_ack *extack) | |
a1b7c5fd | 488 | { |
245dc512 | 489 | struct tcf_block *block = tp->chain->block; |
de4784ca | 490 | struct tc_cls_u32_offload cls_u32 = {}; |
a1b7c5fd | 491 | |
458e704d | 492 | tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack); |
77460411 JP |
493 | cls_u32.command = TC_CLSU32_DELETE_HNODE; |
494 | cls_u32.hnode.divisor = h->divisor; | |
495 | cls_u32.hnode.handle = h->handle; | |
496 | cls_u32.hnode.prio = h->prio; | |
de4784ca | 497 | |
245dc512 | 498 | tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false); |
a1b7c5fd JF |
499 | } |
500 | ||
5a7a5555 | 501 | static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h, |
10a47e0f | 502 | u32 flags, struct netlink_ext_ack *extack) |
a1b7c5fd | 503 | { |
245dc512 | 504 | struct tcf_block *block = tp->chain->block; |
de4784ca | 505 | struct tc_cls_u32_offload cls_u32 = {}; |
245dc512 JP |
506 | bool skip_sw = tc_skip_sw(flags); |
507 | bool offloaded = false; | |
d34e3e18 | 508 | int err; |
a1b7c5fd | 509 | |
f40fe58d | 510 | tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack); |
de4784ca JP |
511 | cls_u32.command = TC_CLSU32_NEW_HNODE; |
512 | cls_u32.hnode.divisor = h->divisor; | |
513 | cls_u32.hnode.handle = h->handle; | |
514 | cls_u32.hnode.prio = h->prio; | |
a1b7c5fd | 515 | |
245dc512 JP |
516 | err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw); |
517 | if (err < 0) { | |
458e704d | 518 | u32_clear_hw_hnode(tp, h, NULL); |
d47a0f38 | 519 | return err; |
245dc512 JP |
520 | } else if (err > 0) { |
521 | offloaded = true; | |
522 | } | |
523 | ||
524 | if (skip_sw && !offloaded) | |
525 | return -EINVAL; | |
d34e3e18 SS |
526 | |
527 | return 0; | |
a1b7c5fd JF |
528 | } |
529 | ||
458e704d JK |
530 | static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, |
531 | struct netlink_ext_ack *extack) | |
a1b7c5fd | 532 | { |
245dc512 | 533 | struct tcf_block *block = tp->chain->block; |
de4784ca | 534 | struct tc_cls_u32_offload cls_u32 = {}; |
a1b7c5fd | 535 | |
458e704d | 536 | tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack); |
77460411 | 537 | cls_u32.command = TC_CLSU32_DELETE_KNODE; |
caa72601 | 538 | cls_u32.knode.handle = n->handle; |
a1b7c5fd | 539 | |
245dc512 | 540 | tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, false); |
caa72601 | 541 | tcf_block_offload_dec(block, &n->flags); |
a1b7c5fd JF |
542 | } |
543 | ||
5a7a5555 | 544 | static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, |
10a47e0f | 545 | u32 flags, struct netlink_ext_ack *extack) |
a1b7c5fd | 546 | { |
058a6c03 | 547 | struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); |
245dc512 | 548 | struct tcf_block *block = tp->chain->block; |
de4784ca | 549 | struct tc_cls_u32_offload cls_u32 = {}; |
245dc512 | 550 | bool skip_sw = tc_skip_sw(flags); |
d34e3e18 | 551 | int err; |
a1b7c5fd | 552 | |
f40fe58d | 553 | tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack); |
de4784ca JP |
554 | cls_u32.command = TC_CLSU32_REPLACE_KNODE; |
555 | cls_u32.knode.handle = n->handle; | |
556 | cls_u32.knode.fshift = n->fshift; | |
a1b7c5fd | 557 | #ifdef CONFIG_CLS_U32_MARK |
de4784ca JP |
558 | cls_u32.knode.val = n->val; |
559 | cls_u32.knode.mask = n->mask; | |
a1b7c5fd | 560 | #else |
de4784ca JP |
561 | cls_u32.knode.val = 0; |
562 | cls_u32.knode.mask = 0; | |
a1b7c5fd | 563 | #endif |
de4784ca JP |
564 | cls_u32.knode.sel = &n->sel; |
565 | cls_u32.knode.exts = &n->exts; | |
201c44bd | 566 | if (n->ht_down) |
058a6c03 | 567 | cls_u32.knode.link_handle = ht->handle; |
201c44bd | 568 | |
245dc512 JP |
569 | err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSU32, &cls_u32, skip_sw); |
570 | if (err < 0) { | |
458e704d | 571 | u32_remove_hw_knode(tp, n, NULL); |
201c44bd | 572 | return err; |
245dc512 | 573 | } else if (err > 0) { |
caa72601 | 574 | tcf_block_offload_inc(block, &n->flags); |
245dc512 JP |
575 | } |
576 | ||
0f04d057 | 577 | if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW)) |
245dc512 | 578 | return -EINVAL; |
d34e3e18 SS |
579 | |
580 | return 0; | |
a1b7c5fd JF |
581 | } |
582 | ||
458e704d JK |
583 | static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, |
584 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
585 | { |
586 | struct tc_u_knode *n; | |
cc7ec456 | 587 | unsigned int h; |
1da177e4 | 588 | |
cc7ec456 | 589 | for (h = 0; h <= ht->divisor; h++) { |
1ce87720 JF |
590 | while ((n = rtnl_dereference(ht->ht[h])) != NULL) { |
591 | RCU_INIT_POINTER(ht->ht[h], | |
592 | rtnl_dereference(n->next)); | |
a0efb80c | 593 | tcf_unbind_filter(tp, &n->res); |
458e704d | 594 | u32_remove_hw_knode(tp, n, extack); |
9c160941 | 595 | idr_remove(&ht->handle_idr, n->handle); |
35c55fc1 | 596 | if (tcf_exts_get_net(&n->exts)) |
aaa908ff | 597 | tcf_queue_work(&n->rwork, u32_delete_key_freepf_work); |
35c55fc1 CW |
598 | else |
599 | u32_destroy_key(n->tp, n, true); | |
1da177e4 LT |
600 | } |
601 | } | |
602 | } | |
603 | ||
458e704d JK |
604 | static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, |
605 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
606 | { |
607 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 JF |
608 | struct tc_u_hnode __rcu **hn; |
609 | struct tc_u_hnode *phn; | |
1da177e4 | 610 | |
547b792c | 611 | WARN_ON(ht->refcnt); |
1da177e4 | 612 | |
458e704d | 613 | u32_clear_hnode(tp, ht, extack); |
1da177e4 | 614 | |
1ce87720 JF |
615 | hn = &tp_c->hlist; |
616 | for (phn = rtnl_dereference(*hn); | |
617 | phn; | |
618 | hn = &phn->next, phn = rtnl_dereference(*hn)) { | |
619 | if (phn == ht) { | |
458e704d | 620 | u32_clear_hw_hnode(tp, ht, extack); |
e7614370 | 621 | idr_destroy(&ht->handle_idr); |
9c160941 | 622 | idr_remove(&tp_c->handle_idr, ht->handle); |
1ce87720 JF |
623 | RCU_INIT_POINTER(*hn, ht->next); |
624 | kfree_rcu(ht, rcu); | |
1da177e4 LT |
625 | return 0; |
626 | } | |
627 | } | |
628 | ||
1da177e4 LT |
629 | return -ENOENT; |
630 | } | |
631 | ||
1e052be6 CW |
632 | static bool ht_empty(struct tc_u_hnode *ht) |
633 | { | |
634 | unsigned int h; | |
635 | ||
636 | for (h = 0; h <= ht->divisor; h++) | |
637 | if (rcu_access_pointer(ht->ht[h])) | |
638 | return false; | |
639 | ||
640 | return true; | |
641 | } | |
642 | ||
715df5ec | 643 | static void u32_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack) |
1da177e4 LT |
644 | { |
645 | struct tc_u_common *tp_c = tp->data; | |
1ce87720 | 646 | struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); |
1da177e4 | 647 | |
547b792c | 648 | WARN_ON(root_ht == NULL); |
1da177e4 LT |
649 | |
650 | if (root_ht && --root_ht->refcnt == 0) | |
458e704d | 651 | u32_destroy_hnode(tp, root_ht, extack); |
1da177e4 LT |
652 | |
653 | if (--tp_c->refcnt == 0) { | |
654 | struct tc_u_hnode *ht; | |
1da177e4 | 655 | |
3cd904ec | 656 | hlist_del(&tp_c->hnode); |
1da177e4 | 657 | |
1ce87720 | 658 | while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) { |
d7cdee5e | 659 | u32_clear_hnode(tp, ht, extack); |
1ce87720 | 660 | RCU_INIT_POINTER(tp_c->hlist, ht->next); |
d7cdee5e PA |
661 | |
662 | /* u32_destroy_key() will later free ht for us, if it's | |
663 | * still referenced by some knode | |
664 | */ | |
665 | if (--ht->refcnt == 0) | |
666 | kfree_rcu(ht, rcu); | |
3ff50b79 | 667 | } |
1da177e4 | 668 | |
e7614370 | 669 | idr_destroy(&tp_c->handle_idr); |
1da177e4 LT |
670 | kfree(tp_c); |
671 | } | |
672 | ||
673 | tp->data = NULL; | |
674 | } | |
675 | ||
571acf21 AA |
676 | static int u32_delete(struct tcf_proto *tp, void *arg, bool *last, |
677 | struct netlink_ext_ack *extack) | |
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 | 687 | if (TC_U32_KEY(ht->handle)) { |
458e704d | 688 | u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack); |
763dbf63 WC |
689 | ret = u32_delete_key(tp, (struct tc_u_knode *)ht); |
690 | goto out; | |
a1b7c5fd | 691 | } |
1da177e4 | 692 | |
4b981dbc AA |
693 | if (root_ht == ht) { |
694 | NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node"); | |
1da177e4 | 695 | return -EINVAL; |
4b981dbc | 696 | } |
1da177e4 | 697 | |
e56cfad1 JP |
698 | if (ht->refcnt == 1) { |
699 | ht->refcnt--; | |
458e704d | 700 | u32_destroy_hnode(tp, ht, extack); |
e56cfad1 | 701 | } else { |
4b981dbc | 702 | NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter"); |
e56cfad1 JP |
703 | return -EBUSY; |
704 | } | |
1da177e4 | 705 | |
763dbf63 WC |
706 | out: |
707 | *last = true; | |
708 | if (root_ht) { | |
709 | if (root_ht->refcnt > 1) { | |
710 | *last = false; | |
711 | goto ret; | |
712 | } | |
713 | if (root_ht->refcnt == 1) { | |
714 | if (!ht_empty(root_ht)) { | |
715 | *last = false; | |
716 | goto ret; | |
717 | } | |
718 | } | |
719 | } | |
720 | ||
721 | if (tp_c->refcnt > 1) { | |
722 | *last = false; | |
723 | goto ret; | |
724 | } | |
725 | ||
726 | if (tp_c->refcnt == 1) { | |
727 | struct tc_u_hnode *ht; | |
728 | ||
729 | for (ht = rtnl_dereference(tp_c->hlist); | |
730 | ht; | |
731 | ht = rtnl_dereference(ht->next)) | |
732 | if (!ht_empty(ht)) { | |
733 | *last = false; | |
734 | break; | |
735 | } | |
736 | } | |
737 | ||
738 | ret: | |
739 | return ret; | |
1da177e4 LT |
740 | } |
741 | ||
e7614370 | 742 | static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid) |
1da177e4 | 743 | { |
f730cb93 | 744 | u32 index = htid | 0x800; |
e7614370 | 745 | u32 max = htid | 0xFFF; |
e7614370 | 746 | |
f730cb93 MW |
747 | if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) { |
748 | index = htid + 1; | |
749 | if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, | |
750 | GFP_KERNEL)) | |
751 | index = max; | |
e7614370 | 752 | } |
7801db8a | 753 | |
f730cb93 | 754 | return index; |
1da177e4 LT |
755 | } |
756 | ||
6fa8c014 PM |
757 | static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { |
758 | [TCA_U32_CLASSID] = { .type = NLA_U32 }, | |
759 | [TCA_U32_HASH] = { .type = NLA_U32 }, | |
760 | [TCA_U32_LINK] = { .type = NLA_U32 }, | |
761 | [TCA_U32_DIVISOR] = { .type = NLA_U32 }, | |
762 | [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, | |
763 | [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
764 | [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, | |
9e8ce79c | 765 | [TCA_U32_FLAGS] = { .type = NLA_U32 }, |
6fa8c014 PM |
766 | }; |
767 | ||
c1b52739 BL |
768 | static int u32_set_parms(struct net *net, struct tcf_proto *tp, |
769 | unsigned long base, struct tc_u_hnode *ht, | |
add93b61 | 770 | struct tc_u_knode *n, struct nlattr **tb, |
50a56190 AA |
771 | struct nlattr *est, bool ovr, |
772 | struct netlink_ext_ack *extack) | |
1da177e4 | 773 | { |
b9a24bb7 | 774 | int err; |
1da177e4 | 775 | |
50a56190 | 776 | err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, extack); |
1da177e4 LT |
777 | if (err < 0) |
778 | return err; | |
779 | ||
add93b61 | 780 | if (tb[TCA_U32_LINK]) { |
1587bac4 | 781 | u32 handle = nla_get_u32(tb[TCA_U32_LINK]); |
47a1a1d4 | 782 | struct tc_u_hnode *ht_down = NULL, *ht_old; |
1da177e4 | 783 | |
4b981dbc AA |
784 | if (TC_U32_KEY(handle)) { |
785 | NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table"); | |
705c7091 | 786 | return -EINVAL; |
4b981dbc | 787 | } |
1da177e4 LT |
788 | |
789 | if (handle) { | |
790 | ht_down = u32_lookup_ht(ht->tp_c, handle); | |
791 | ||
4b981dbc AA |
792 | if (!ht_down) { |
793 | NL_SET_ERR_MSG_MOD(extack, "Link hash table not found"); | |
705c7091 | 794 | return -EINVAL; |
4b981dbc | 795 | } |
1da177e4 LT |
796 | ht_down->refcnt++; |
797 | } | |
798 | ||
1ce87720 JF |
799 | ht_old = rtnl_dereference(n->ht_down); |
800 | rcu_assign_pointer(n->ht_down, ht_down); | |
1da177e4 | 801 | |
47a1a1d4 PM |
802 | if (ht_old) |
803 | ht_old->refcnt--; | |
1da177e4 | 804 | } |
add93b61 | 805 | if (tb[TCA_U32_CLASSID]) { |
1587bac4 | 806 | n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); |
1da177e4 LT |
807 | tcf_bind_filter(tp, &n->res, base); |
808 | } | |
809 | ||
810 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 811 | if (tb[TCA_U32_INDEV]) { |
2519a602 | 812 | int ret; |
1057c55f | 813 | ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack); |
2519a602 | 814 | if (ret < 0) |
705c7091 | 815 | return -EINVAL; |
2519a602 | 816 | n->ifindex = ret; |
1da177e4 LT |
817 | } |
818 | #endif | |
1da177e4 | 819 | return 0; |
1da177e4 LT |
820 | } |
821 | ||
5a7a5555 | 822 | static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c, |
de5df632 JF |
823 | struct tc_u_knode *n) |
824 | { | |
825 | struct tc_u_knode __rcu **ins; | |
826 | struct tc_u_knode *pins; | |
827 | struct tc_u_hnode *ht; | |
828 | ||
829 | if (TC_U32_HTID(n->handle) == TC_U32_ROOT) | |
830 | ht = rtnl_dereference(tp->root); | |
831 | else | |
832 | ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle)); | |
833 | ||
834 | ins = &ht->ht[TC_U32_HASH(n->handle)]; | |
835 | ||
836 | /* The node must always exist for it to be replaced if this is not the | |
837 | * case then something went very wrong elsewhere. | |
838 | */ | |
839 | for (pins = rtnl_dereference(*ins); ; | |
840 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
841 | if (pins->handle == n->handle) | |
842 | break; | |
843 | ||
234a4624 | 844 | idr_replace(&ht->handle_idr, n, n->handle); |
de5df632 JF |
845 | RCU_INIT_POINTER(n->next, pins->next); |
846 | rcu_assign_pointer(*ins, n); | |
847 | } | |
848 | ||
849 | static struct tc_u_knode *u32_init_knode(struct tcf_proto *tp, | |
850 | struct tc_u_knode *n) | |
851 | { | |
058a6c03 | 852 | struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); |
de5df632 | 853 | struct tc_u32_sel *s = &n->sel; |
058a6c03 | 854 | struct tc_u_knode *new; |
de5df632 JF |
855 | |
856 | new = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), | |
857 | GFP_KERNEL); | |
858 | ||
859 | if (!new) | |
860 | return NULL; | |
861 | ||
862 | RCU_INIT_POINTER(new->next, n->next); | |
863 | new->handle = n->handle; | |
864 | RCU_INIT_POINTER(new->ht_up, n->ht_up); | |
865 | ||
866 | #ifdef CONFIG_NET_CLS_IND | |
867 | new->ifindex = n->ifindex; | |
868 | #endif | |
869 | new->fshift = n->fshift; | |
870 | new->res = n->res; | |
9e8ce79c | 871 | new->flags = n->flags; |
058a6c03 | 872 | RCU_INIT_POINTER(new->ht_down, ht); |
de5df632 JF |
873 | |
874 | /* bump reference count as long as we hold pointer to structure */ | |
058a6c03 PA |
875 | if (ht) |
876 | ht->refcnt++; | |
de5df632 JF |
877 | |
878 | #ifdef CONFIG_CLS_U32_PERF | |
879 | /* Statistics may be incremented by readers during update | |
880 | * so we must keep them in tact. When the node is later destroyed | |
881 | * a special destroy call must be made to not free the pf memory. | |
882 | */ | |
883 | new->pf = n->pf; | |
884 | #endif | |
885 | ||
886 | #ifdef CONFIG_CLS_U32_MARK | |
887 | new->val = n->val; | |
888 | new->mask = n->mask; | |
889 | /* Similarly success statistics must be moved as pointers */ | |
890 | new->pcpu_success = n->pcpu_success; | |
891 | #endif | |
892 | new->tp = tp; | |
893 | memcpy(&new->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
894 | ||
b9a24bb7 WC |
895 | if (tcf_exts_init(&new->exts, TCA_U32_ACT, TCA_U32_POLICE)) { |
896 | kfree(new); | |
897 | return NULL; | |
898 | } | |
de5df632 JF |
899 | |
900 | return new; | |
901 | } | |
902 | ||
c1b52739 | 903 | static int u32_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 904 | struct tcf_proto *tp, unsigned long base, u32 handle, |
7306db38 AA |
905 | struct nlattr **tca, void **arg, bool ovr, |
906 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
907 | { |
908 | struct tc_u_common *tp_c = tp->data; | |
909 | struct tc_u_hnode *ht; | |
910 | struct tc_u_knode *n; | |
911 | struct tc_u32_sel *s; | |
add93b61 PM |
912 | struct nlattr *opt = tca[TCA_OPTIONS]; |
913 | struct nlattr *tb[TCA_U32_MAX + 1]; | |
9e8ce79c | 914 | u32 htid, flags = 0; |
1da177e4 | 915 | int err; |
459d5f62 JF |
916 | #ifdef CONFIG_CLS_U32_PERF |
917 | size_t size; | |
918 | #endif | |
1da177e4 | 919 | |
4b981dbc AA |
920 | if (!opt) { |
921 | if (handle) { | |
922 | NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options"); | |
923 | return -EINVAL; | |
924 | } else { | |
925 | return 0; | |
926 | } | |
927 | } | |
1da177e4 | 928 | |
4b981dbc | 929 | err = nla_parse_nested(tb, TCA_U32_MAX, opt, u32_policy, extack); |
cee63723 PM |
930 | if (err < 0) |
931 | return err; | |
1da177e4 | 932 | |
d34e3e18 | 933 | if (tb[TCA_U32_FLAGS]) { |
9e8ce79c | 934 | flags = nla_get_u32(tb[TCA_U32_FLAGS]); |
4b981dbc AA |
935 | if (!tc_flags_valid(flags)) { |
936 | NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags"); | |
1a0f7d29 | 937 | return -EINVAL; |
4b981dbc | 938 | } |
d34e3e18 | 939 | } |
9e8ce79c | 940 | |
8113c095 | 941 | n = *arg; |
cc7ec456 | 942 | if (n) { |
de5df632 JF |
943 | struct tc_u_knode *new; |
944 | ||
4b981dbc AA |
945 | if (TC_U32_KEY(n->handle) == 0) { |
946 | NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero"); | |
1da177e4 | 947 | return -EINVAL; |
4b981dbc | 948 | } |
1da177e4 | 949 | |
eb53f7af IV |
950 | if ((n->flags ^ flags) & |
951 | ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) { | |
4b981dbc | 952 | NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags"); |
9e8ce79c | 953 | return -EINVAL; |
4b981dbc | 954 | } |
9e8ce79c | 955 | |
de5df632 JF |
956 | new = u32_init_knode(tp, n); |
957 | if (!new) | |
958 | return -ENOMEM; | |
959 | ||
960 | err = u32_set_parms(net, tp, base, | |
961 | rtnl_dereference(n->ht_up), new, tb, | |
50a56190 | 962 | tca[TCA_RATE], ovr, extack); |
de5df632 JF |
963 | |
964 | if (err) { | |
965 | u32_destroy_key(tp, new, false); | |
966 | return err; | |
967 | } | |
968 | ||
10a47e0f | 969 | err = u32_replace_hw_knode(tp, new, flags, extack); |
d34e3e18 SS |
970 | if (err) { |
971 | u32_destroy_key(tp, new, false); | |
972 | return err; | |
973 | } | |
974 | ||
24d3dc6d OG |
975 | if (!tc_in_hw(new->flags)) |
976 | new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
977 | ||
de5df632 | 978 | u32_replace_knode(tp, tp_c, new); |
a0efb80c | 979 | tcf_unbind_filter(tp, &n->res); |
35c55fc1 | 980 | tcf_exts_get_net(&n->exts); |
aaa908ff | 981 | tcf_queue_work(&n->rwork, u32_delete_key_work); |
de5df632 | 982 | return 0; |
1da177e4 LT |
983 | } |
984 | ||
add93b61 | 985 | if (tb[TCA_U32_DIVISOR]) { |
cc7ec456 | 986 | unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); |
1da177e4 | 987 | |
4b981dbc AA |
988 | if (--divisor > 0x100) { |
989 | NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets"); | |
1da177e4 | 990 | return -EINVAL; |
4b981dbc AA |
991 | } |
992 | if (TC_U32_KEY(handle)) { | |
993 | NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table"); | |
1da177e4 | 994 | return -EINVAL; |
4b981dbc | 995 | } |
cc7ec456 | 996 | ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); |
1da177e4 LT |
997 | if (ht == NULL) |
998 | return -ENOBUFS; | |
e7614370 CW |
999 | if (handle == 0) { |
1000 | handle = gen_new_htid(tp->data, ht); | |
1001 | if (handle == 0) { | |
1002 | kfree(ht); | |
1003 | return -ENOMEM; | |
1004 | } | |
1005 | } else { | |
f730cb93 MW |
1006 | err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle, |
1007 | handle, GFP_KERNEL); | |
e7614370 CW |
1008 | if (err) { |
1009 | kfree(ht); | |
1010 | return err; | |
1011 | } | |
1012 | } | |
1da177e4 | 1013 | ht->tp_c = tp_c; |
e56cfad1 | 1014 | ht->refcnt = 1; |
1da177e4 LT |
1015 | ht->divisor = divisor; |
1016 | ht->handle = handle; | |
1017 | ht->prio = tp->prio; | |
e7614370 | 1018 | idr_init(&ht->handle_idr); |
f40fe58d | 1019 | ht->flags = flags; |
6eef3801 | 1020 | |
10a47e0f | 1021 | err = u32_replace_hw_hnode(tp, ht, flags, extack); |
6eef3801 | 1022 | if (err) { |
9c160941 | 1023 | idr_remove(&tp_c->handle_idr, handle); |
6eef3801 JK |
1024 | kfree(ht); |
1025 | return err; | |
1026 | } | |
1027 | ||
1ce87720 JF |
1028 | RCU_INIT_POINTER(ht->next, tp_c->hlist); |
1029 | rcu_assign_pointer(tp_c->hlist, ht); | |
8113c095 | 1030 | *arg = ht; |
a1b7c5fd | 1031 | |
1da177e4 LT |
1032 | return 0; |
1033 | } | |
1034 | ||
add93b61 | 1035 | if (tb[TCA_U32_HASH]) { |
1587bac4 | 1036 | htid = nla_get_u32(tb[TCA_U32_HASH]); |
1da177e4 | 1037 | if (TC_U32_HTID(htid) == TC_U32_ROOT) { |
1ce87720 | 1038 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
1039 | htid = ht->handle; |
1040 | } else { | |
1041 | ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); | |
4b981dbc AA |
1042 | if (!ht) { |
1043 | NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found"); | |
1da177e4 | 1044 | return -EINVAL; |
4b981dbc | 1045 | } |
1da177e4 LT |
1046 | } |
1047 | } else { | |
1ce87720 | 1048 | ht = rtnl_dereference(tp->root); |
1da177e4 LT |
1049 | htid = ht->handle; |
1050 | } | |
1051 | ||
4b981dbc AA |
1052 | if (ht->divisor < TC_U32_HASH(htid)) { |
1053 | NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value"); | |
1da177e4 | 1054 | return -EINVAL; |
4b981dbc | 1055 | } |
1da177e4 LT |
1056 | |
1057 | if (handle) { | |
4b981dbc AA |
1058 | if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) { |
1059 | NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch"); | |
1da177e4 | 1060 | return -EINVAL; |
4b981dbc | 1061 | } |
1da177e4 | 1062 | handle = htid | TC_U32_NODE(handle); |
f730cb93 | 1063 | err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle, |
e7614370 CW |
1064 | GFP_KERNEL); |
1065 | if (err) | |
1066 | return err; | |
1da177e4 LT |
1067 | } else |
1068 | handle = gen_new_kid(ht, htid); | |
1069 | ||
e7614370 | 1070 | if (tb[TCA_U32_SEL] == NULL) { |
4b981dbc | 1071 | NL_SET_ERR_MSG_MOD(extack, "Selector not specified"); |
e7614370 CW |
1072 | err = -EINVAL; |
1073 | goto erridr; | |
1074 | } | |
1da177e4 | 1075 | |
add93b61 | 1076 | s = nla_data(tb[TCA_U32_SEL]); |
1da177e4 | 1077 | |
0da974f4 | 1078 | n = kzalloc(sizeof(*n) + s->nkeys*sizeof(struct tc_u32_key), GFP_KERNEL); |
e7614370 CW |
1079 | if (n == NULL) { |
1080 | err = -ENOBUFS; | |
1081 | goto erridr; | |
1082 | } | |
1da177e4 | 1083 | |
1da177e4 | 1084 | #ifdef CONFIG_CLS_U32_PERF |
459d5f62 JF |
1085 | size = sizeof(struct tc_u32_pcnt) + s->nkeys * sizeof(u64); |
1086 | n->pf = __alloc_percpu(size, __alignof__(struct tc_u32_pcnt)); | |
1087 | if (!n->pf) { | |
e7614370 CW |
1088 | err = -ENOBUFS; |
1089 | goto errfree; | |
1da177e4 | 1090 | } |
1da177e4 LT |
1091 | #endif |
1092 | ||
1093 | memcpy(&n->sel, s, sizeof(*s) + s->nkeys*sizeof(struct tc_u32_key)); | |
a96366bf | 1094 | RCU_INIT_POINTER(n->ht_up, ht); |
1da177e4 | 1095 | n->handle = handle; |
b2268016 | 1096 | n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; |
9e8ce79c | 1097 | n->flags = flags; |
1ce87720 | 1098 | n->tp = tp; |
1da177e4 | 1099 | |
b9a24bb7 WC |
1100 | err = tcf_exts_init(&n->exts, TCA_U32_ACT, TCA_U32_POLICE); |
1101 | if (err < 0) | |
1102 | goto errout; | |
1103 | ||
1da177e4 | 1104 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 | 1105 | n->pcpu_success = alloc_percpu(u32); |
a1ddcfee JF |
1106 | if (!n->pcpu_success) { |
1107 | err = -ENOMEM; | |
1108 | goto errout; | |
1109 | } | |
459d5f62 | 1110 | |
add93b61 | 1111 | if (tb[TCA_U32_MARK]) { |
1da177e4 LT |
1112 | struct tc_u32_mark *mark; |
1113 | ||
add93b61 | 1114 | mark = nla_data(tb[TCA_U32_MARK]); |
459d5f62 JF |
1115 | n->val = mark->val; |
1116 | n->mask = mark->mask; | |
1da177e4 LT |
1117 | } |
1118 | #endif | |
1119 | ||
50a56190 AA |
1120 | err = u32_set_parms(net, tp, base, ht, n, tb, tca[TCA_RATE], ovr, |
1121 | extack); | |
1da177e4 | 1122 | if (err == 0) { |
1ce87720 JF |
1123 | struct tc_u_knode __rcu **ins; |
1124 | struct tc_u_knode *pins; | |
1125 | ||
10a47e0f | 1126 | err = u32_replace_hw_knode(tp, n, flags, extack); |
d34e3e18 SS |
1127 | if (err) |
1128 | goto errhw; | |
1129 | ||
24d3dc6d OG |
1130 | if (!tc_in_hw(n->flags)) |
1131 | n->flags |= TCA_CLS_FLAGS_NOT_IN_HW; | |
1132 | ||
1ce87720 JF |
1133 | ins = &ht->ht[TC_U32_HASH(handle)]; |
1134 | for (pins = rtnl_dereference(*ins); pins; | |
1135 | ins = &pins->next, pins = rtnl_dereference(*ins)) | |
1136 | if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle)) | |
1da177e4 LT |
1137 | break; |
1138 | ||
1ce87720 JF |
1139 | RCU_INIT_POINTER(n->next, pins); |
1140 | rcu_assign_pointer(*ins, n); | |
8113c095 | 1141 | *arg = n; |
1da177e4 LT |
1142 | return 0; |
1143 | } | |
a1ddcfee | 1144 | |
d34e3e18 | 1145 | errhw: |
a1ddcfee JF |
1146 | #ifdef CONFIG_CLS_U32_MARK |
1147 | free_percpu(n->pcpu_success); | |
1148 | #endif | |
1149 | ||
b9a24bb7 WC |
1150 | errout: |
1151 | tcf_exts_destroy(&n->exts); | |
1da177e4 | 1152 | #ifdef CONFIG_CLS_U32_PERF |
e7614370 | 1153 | errfree: |
1ce87720 | 1154 | free_percpu(n->pf); |
1da177e4 LT |
1155 | #endif |
1156 | kfree(n); | |
e7614370 | 1157 | erridr: |
9c160941 | 1158 | idr_remove(&ht->handle_idr, handle); |
1da177e4 LT |
1159 | return err; |
1160 | } | |
1161 | ||
1162 | static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
1163 | { | |
1164 | struct tc_u_common *tp_c = tp->data; | |
1165 | struct tc_u_hnode *ht; | |
1166 | struct tc_u_knode *n; | |
cc7ec456 | 1167 | unsigned int h; |
1da177e4 LT |
1168 | |
1169 | if (arg->stop) | |
1170 | return; | |
1171 | ||
1ce87720 JF |
1172 | for (ht = rtnl_dereference(tp_c->hlist); |
1173 | ht; | |
1174 | ht = rtnl_dereference(ht->next)) { | |
1da177e4 LT |
1175 | if (ht->prio != tp->prio) |
1176 | continue; | |
1177 | if (arg->count >= arg->skip) { | |
8113c095 | 1178 | if (arg->fn(tp, ht, arg) < 0) { |
1da177e4 LT |
1179 | arg->stop = 1; |
1180 | return; | |
1181 | } | |
1182 | } | |
1183 | arg->count++; | |
1184 | for (h = 0; h <= ht->divisor; h++) { | |
1ce87720 JF |
1185 | for (n = rtnl_dereference(ht->ht[h]); |
1186 | n; | |
1187 | n = rtnl_dereference(n->next)) { | |
1da177e4 LT |
1188 | if (arg->count < arg->skip) { |
1189 | arg->count++; | |
1190 | continue; | |
1191 | } | |
8113c095 | 1192 | if (arg->fn(tp, n, arg) < 0) { |
1da177e4 LT |
1193 | arg->stop = 1; |
1194 | return; | |
1195 | } | |
1196 | arg->count++; | |
1197 | } | |
1198 | } | |
1199 | } | |
1200 | } | |
1201 | ||
07d79fc7 CW |
1202 | static void u32_bind_class(void *fh, u32 classid, unsigned long cl) |
1203 | { | |
1204 | struct tc_u_knode *n = fh; | |
1205 | ||
1206 | if (n && n->res.classid == classid) | |
1207 | n->res.class = cl; | |
1208 | } | |
1209 | ||
8113c095 | 1210 | static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh, |
5a7a5555 | 1211 | struct sk_buff *skb, struct tcmsg *t) |
1da177e4 | 1212 | { |
8113c095 | 1213 | struct tc_u_knode *n = fh; |
1ce87720 | 1214 | struct tc_u_hnode *ht_up, *ht_down; |
4b3550ef | 1215 | struct nlattr *nest; |
1da177e4 LT |
1216 | |
1217 | if (n == NULL) | |
1218 | return skb->len; | |
1219 | ||
1220 | t->tcm_handle = n->handle; | |
1221 | ||
4b3550ef PM |
1222 | nest = nla_nest_start(skb, TCA_OPTIONS); |
1223 | if (nest == NULL) | |
1224 | goto nla_put_failure; | |
1da177e4 LT |
1225 | |
1226 | if (TC_U32_KEY(n->handle) == 0) { | |
8113c095 | 1227 | struct tc_u_hnode *ht = fh; |
cc7ec456 ED |
1228 | u32 divisor = ht->divisor + 1; |
1229 | ||
1b34ec43 DM |
1230 | if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) |
1231 | goto nla_put_failure; | |
1da177e4 | 1232 | } else { |
459d5f62 JF |
1233 | #ifdef CONFIG_CLS_U32_PERF |
1234 | struct tc_u32_pcnt *gpf; | |
459d5f62 | 1235 | int cpu; |
80aab73d | 1236 | #endif |
459d5f62 | 1237 | |
1b34ec43 DM |
1238 | if (nla_put(skb, TCA_U32_SEL, |
1239 | sizeof(n->sel) + n->sel.nkeys*sizeof(struct tc_u32_key), | |
1240 | &n->sel)) | |
1241 | goto nla_put_failure; | |
1ce87720 JF |
1242 | |
1243 | ht_up = rtnl_dereference(n->ht_up); | |
1244 | if (ht_up) { | |
1da177e4 | 1245 | u32 htid = n->handle & 0xFFFFF000; |
1b34ec43 DM |
1246 | if (nla_put_u32(skb, TCA_U32_HASH, htid)) |
1247 | goto nla_put_failure; | |
1da177e4 | 1248 | } |
1b34ec43 DM |
1249 | if (n->res.classid && |
1250 | nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) | |
1251 | goto nla_put_failure; | |
1ce87720 JF |
1252 | |
1253 | ht_down = rtnl_dereference(n->ht_down); | |
1254 | if (ht_down && | |
1255 | nla_put_u32(skb, TCA_U32_LINK, ht_down->handle)) | |
1b34ec43 | 1256 | goto nla_put_failure; |
1da177e4 | 1257 | |
9e8ce79c JF |
1258 | if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags)) |
1259 | goto nla_put_failure; | |
1260 | ||
1da177e4 | 1261 | #ifdef CONFIG_CLS_U32_MARK |
459d5f62 JF |
1262 | if ((n->val || n->mask)) { |
1263 | struct tc_u32_mark mark = {.val = n->val, | |
1264 | .mask = n->mask, | |
1265 | .success = 0}; | |
80aab73d | 1266 | int cpum; |
459d5f62 | 1267 | |
80aab73d JF |
1268 | for_each_possible_cpu(cpum) { |
1269 | __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum); | |
459d5f62 JF |
1270 | |
1271 | mark.success += cnt; | |
1272 | } | |
1273 | ||
1274 | if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark)) | |
1275 | goto nla_put_failure; | |
1276 | } | |
1da177e4 LT |
1277 | #endif |
1278 | ||
5da57f42 | 1279 | if (tcf_exts_dump(skb, &n->exts) < 0) |
add93b61 | 1280 | goto nla_put_failure; |
1da177e4 LT |
1281 | |
1282 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 WC |
1283 | if (n->ifindex) { |
1284 | struct net_device *dev; | |
1285 | dev = __dev_get_by_index(net, n->ifindex); | |
1286 | if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) | |
1287 | goto nla_put_failure; | |
1288 | } | |
1da177e4 LT |
1289 | #endif |
1290 | #ifdef CONFIG_CLS_U32_PERF | |
459d5f62 JF |
1291 | gpf = kzalloc(sizeof(struct tc_u32_pcnt) + |
1292 | n->sel.nkeys * sizeof(u64), | |
1293 | GFP_KERNEL); | |
1294 | if (!gpf) | |
1295 | goto nla_put_failure; | |
1296 | ||
1297 | for_each_possible_cpu(cpu) { | |
1298 | int i; | |
1299 | struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu); | |
1300 | ||
1301 | gpf->rcnt += pf->rcnt; | |
1302 | gpf->rhit += pf->rhit; | |
1303 | for (i = 0; i < n->sel.nkeys; i++) | |
1304 | gpf->kcnts[i] += pf->kcnts[i]; | |
1305 | } | |
1306 | ||
9854518e ND |
1307 | if (nla_put_64bit(skb, TCA_U32_PCNT, |
1308 | sizeof(struct tc_u32_pcnt) + | |
1309 | n->sel.nkeys * sizeof(u64), | |
1310 | gpf, TCA_U32_PAD)) { | |
459d5f62 | 1311 | kfree(gpf); |
1b34ec43 | 1312 | goto nla_put_failure; |
459d5f62 JF |
1313 | } |
1314 | kfree(gpf); | |
1da177e4 LT |
1315 | #endif |
1316 | } | |
1317 | ||
4b3550ef PM |
1318 | nla_nest_end(skb, nest); |
1319 | ||
1da177e4 | 1320 | if (TC_U32_KEY(n->handle)) |
5da57f42 | 1321 | if (tcf_exts_dump_stats(skb, &n->exts) < 0) |
add93b61 | 1322 | goto nla_put_failure; |
1da177e4 LT |
1323 | return skb->len; |
1324 | ||
add93b61 | 1325 | nla_put_failure: |
4b3550ef | 1326 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
1327 | return -1; |
1328 | } | |
1329 | ||
2eb9d75c | 1330 | static struct tcf_proto_ops cls_u32_ops __read_mostly = { |
1da177e4 LT |
1331 | .kind = "u32", |
1332 | .classify = u32_classify, | |
1333 | .init = u32_init, | |
1334 | .destroy = u32_destroy, | |
1335 | .get = u32_get, | |
1da177e4 LT |
1336 | .change = u32_change, |
1337 | .delete = u32_delete, | |
1338 | .walk = u32_walk, | |
1339 | .dump = u32_dump, | |
07d79fc7 | 1340 | .bind_class = u32_bind_class, |
1da177e4 LT |
1341 | .owner = THIS_MODULE, |
1342 | }; | |
1343 | ||
1344 | static int __init init_u32(void) | |
1345 | { | |
3cd904ec WC |
1346 | int i, ret; |
1347 | ||
6ff9c364 | 1348 | pr_info("u32 classifier\n"); |
1da177e4 | 1349 | #ifdef CONFIG_CLS_U32_PERF |
6ff9c364 | 1350 | pr_info(" Performance counters on\n"); |
1da177e4 | 1351 | #endif |
1da177e4 | 1352 | #ifdef CONFIG_NET_CLS_IND |
6ff9c364 | 1353 | pr_info(" input device check on\n"); |
1da177e4 LT |
1354 | #endif |
1355 | #ifdef CONFIG_NET_CLS_ACT | |
6ff9c364 | 1356 | pr_info(" Actions configured\n"); |
1da177e4 | 1357 | #endif |
3cd904ec WC |
1358 | tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE, |
1359 | sizeof(struct hlist_head), | |
1360 | GFP_KERNEL); | |
1361 | if (!tc_u_common_hash) | |
1362 | return -ENOMEM; | |
1363 | ||
1364 | for (i = 0; i < U32_HASH_SIZE; i++) | |
1365 | INIT_HLIST_HEAD(&tc_u_common_hash[i]); | |
1366 | ||
1367 | ret = register_tcf_proto_ops(&cls_u32_ops); | |
1368 | if (ret) | |
1369 | kvfree(tc_u_common_hash); | |
1370 | return ret; | |
1da177e4 LT |
1371 | } |
1372 | ||
10297b99 | 1373 | static void __exit exit_u32(void) |
1da177e4 LT |
1374 | { |
1375 | unregister_tcf_proto_ops(&cls_u32_ops); | |
3cd904ec | 1376 | kvfree(tc_u_common_hash); |
1da177e4 LT |
1377 | } |
1378 | ||
1379 | module_init(init_u32) | |
1380 | module_exit(exit_u32) | |
1381 | MODULE_LICENSE("GPL"); |