1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * net/sched/cls_u32.c Ugly (or Universal) 32bit key Packet Classifier. 4 * 5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 6 * 7 * The filters are packed to hash tables of key nodes 8 * with a set of 32bit key/mask pairs at every node. 9 * Nodes reference next level hash tables etc. 10 * 11 * This scheme is the best universal classifier I managed to 12 * invent; it is not super-fast, but it is not slow (provided you 13 * program it correctly), and general enough. And its relative 14 * speed grows as the number of rules becomes larger. 15 * 16 * It seems that it represents the best middle point between 17 * speed and manageability both by human and by machine. 18 * 19 * It is especially useful for link sharing combined with QoS; 20 * pure RSVP doesn't need such a general approach and can use 21 * much simpler (and faster) schemes, sort of cls_rsvp.c. 22 * 23 * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro> 24 */ 25 26 #include <linux/module.h> 27 #include <linux/slab.h> 28 #include <linux/types.h> 29 #include <linux/kernel.h> 30 #include <linux/string.h> 31 #include <linux/errno.h> 32 #include <linux/percpu.h> 33 #include <linux/rtnetlink.h> 34 #include <linux/skbuff.h> 35 #include <linux/bitmap.h> 36 #include <linux/netdevice.h> 37 #include <linux/hash.h> 38 #include <net/netlink.h> 39 #include <net/act_api.h> 40 #include <net/pkt_cls.h> 41 #include <linux/idr.h> 42 #include <net/tc_wrapper.h> 43 44 struct tc_u_knode { 45 struct tc_u_knode __rcu *next; 46 u32 handle; 47 struct tc_u_hnode __rcu *ht_up; 48 struct tcf_exts exts; 49 int ifindex; 50 u8 fshift; 51 struct tcf_result res; 52 struct tc_u_hnode __rcu *ht_down; 53 #ifdef CONFIG_CLS_U32_PERF 54 struct tc_u32_pcnt __percpu *pf; 55 #endif 56 u32 flags; 57 unsigned int in_hw_count; 58 #ifdef CONFIG_CLS_U32_MARK 59 u32 val; 60 u32 mask; 61 u32 __percpu *pcpu_success; 62 #endif 63 struct rcu_work rwork; 64 /* The 'sel' field MUST be the last field in structure to allow for 65 * tc_u32_keys allocated at end of structure. 66 */ 67 struct tc_u32_sel sel; 68 }; 69 70 struct tc_u_hnode { 71 struct tc_u_hnode __rcu *next; 72 u32 handle; 73 u32 prio; 74 int refcnt; 75 unsigned int divisor; 76 struct idr handle_idr; 77 bool is_root; 78 struct rcu_head rcu; 79 u32 flags; 80 /* The 'ht' field MUST be the last field in structure to allow for 81 * more entries allocated at end of structure. 82 */ 83 struct tc_u_knode __rcu *ht[]; 84 }; 85 86 struct tc_u_common { 87 struct tc_u_hnode __rcu *hlist; 88 void *ptr; 89 int refcnt; 90 struct idr handle_idr; 91 struct hlist_node hnode; 92 long knodes; 93 }; 94 95 static inline unsigned int u32_hash_fold(__be32 key, 96 const struct tc_u32_sel *sel, 97 u8 fshift) 98 { 99 unsigned int h = ntohl(key & sel->hmask) >> fshift; 100 101 return h; 102 } 103 104 TC_INDIRECT_SCOPE int u32_classify(struct sk_buff *skb, 105 const struct tcf_proto *tp, 106 struct tcf_result *res) 107 { 108 struct { 109 struct tc_u_knode *knode; 110 unsigned int off; 111 } stack[TC_U32_MAXDEPTH]; 112 113 struct tc_u_hnode *ht = rcu_dereference_bh(tp->root); 114 unsigned int off = skb_network_offset(skb); 115 struct tc_u_knode *n; 116 int sdepth = 0; 117 int off2 = 0; 118 int sel = 0; 119 #ifdef CONFIG_CLS_U32_PERF 120 int j; 121 #endif 122 int i, r; 123 124 next_ht: 125 n = rcu_dereference_bh(ht->ht[sel]); 126 127 next_knode: 128 if (n) { 129 struct tc_u32_key *key = n->sel.keys; 130 131 #ifdef CONFIG_CLS_U32_PERF 132 __this_cpu_inc(n->pf->rcnt); 133 j = 0; 134 #endif 135 136 if (tc_skip_sw(n->flags)) { 137 n = rcu_dereference_bh(n->next); 138 goto next_knode; 139 } 140 141 #ifdef CONFIG_CLS_U32_MARK 142 if ((skb->mark & n->mask) != n->val) { 143 n = rcu_dereference_bh(n->next); 144 goto next_knode; 145 } else { 146 __this_cpu_inc(*n->pcpu_success); 147 } 148 #endif 149 150 for (i = n->sel.nkeys; i > 0; i--, key++) { 151 int toff = off + key->off + (off2 & key->offmask); 152 __be32 *data, hdata; 153 154 if (skb_headroom(skb) + toff > INT_MAX) 155 goto out; 156 157 data = skb_header_pointer(skb, toff, 4, &hdata); 158 if (!data) 159 goto out; 160 if ((*data ^ key->val) & key->mask) { 161 n = rcu_dereference_bh(n->next); 162 goto next_knode; 163 } 164 #ifdef CONFIG_CLS_U32_PERF 165 __this_cpu_inc(n->pf->kcnts[j]); 166 j++; 167 #endif 168 } 169 170 ht = rcu_dereference_bh(n->ht_down); 171 if (!ht) { 172 check_terminal: 173 if (n->sel.flags & TC_U32_TERMINAL) { 174 175 *res = n->res; 176 if (!tcf_match_indev(skb, n->ifindex)) { 177 n = rcu_dereference_bh(n->next); 178 goto next_knode; 179 } 180 #ifdef CONFIG_CLS_U32_PERF 181 __this_cpu_inc(n->pf->rhit); 182 #endif 183 r = tcf_exts_exec(skb, &n->exts, res); 184 if (r < 0) { 185 n = rcu_dereference_bh(n->next); 186 goto next_knode; 187 } 188 189 return r; 190 } 191 n = rcu_dereference_bh(n->next); 192 goto next_knode; 193 } 194 195 /* PUSH */ 196 if (sdepth >= TC_U32_MAXDEPTH) 197 goto deadloop; 198 stack[sdepth].knode = n; 199 stack[sdepth].off = off; 200 sdepth++; 201 202 ht = rcu_dereference_bh(n->ht_down); 203 sel = 0; 204 if (ht->divisor) { 205 __be32 *data, hdata; 206 207 data = skb_header_pointer(skb, off + n->sel.hoff, 4, 208 &hdata); 209 if (!data) 210 goto out; 211 sel = ht->divisor & u32_hash_fold(*data, &n->sel, 212 n->fshift); 213 } 214 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) 215 goto next_ht; 216 217 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { 218 off2 = n->sel.off + 3; 219 if (n->sel.flags & TC_U32_VAROFFSET) { 220 __be16 *data, hdata; 221 222 data = skb_header_pointer(skb, 223 off + n->sel.offoff, 224 2, &hdata); 225 if (!data) 226 goto out; 227 off2 += ntohs(n->sel.offmask & *data) >> 228 n->sel.offshift; 229 } 230 off2 &= ~3; 231 } 232 if (n->sel.flags & TC_U32_EAT) { 233 off += off2; 234 off2 = 0; 235 } 236 237 if (off < skb->len) 238 goto next_ht; 239 } 240 241 /* POP */ 242 if (sdepth--) { 243 n = stack[sdepth].knode; 244 ht = rcu_dereference_bh(n->ht_up); 245 off = stack[sdepth].off; 246 goto check_terminal; 247 } 248 out: 249 return -1; 250 251 deadloop: 252 net_warn_ratelimited("cls_u32: dead loop\n"); 253 return -1; 254 } 255 256 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) 257 { 258 struct tc_u_hnode *ht; 259 260 for (ht = rtnl_dereference(tp_c->hlist); 261 ht; 262 ht = rtnl_dereference(ht->next)) 263 if (ht->handle == handle) 264 break; 265 266 return ht; 267 } 268 269 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle) 270 { 271 unsigned int sel; 272 struct tc_u_knode *n = NULL; 273 274 sel = TC_U32_HASH(handle); 275 if (sel > ht->divisor) 276 goto out; 277 278 for (n = rtnl_dereference(ht->ht[sel]); 279 n; 280 n = rtnl_dereference(n->next)) 281 if (n->handle == handle) 282 break; 283 out: 284 return n; 285 } 286 287 288 static void *u32_get(struct tcf_proto *tp, u32 handle) 289 { 290 struct tc_u_hnode *ht; 291 struct tc_u_common *tp_c = tp->data; 292 293 if (TC_U32_HTID(handle) == TC_U32_ROOT) 294 ht = rtnl_dereference(tp->root); 295 else 296 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); 297 298 if (!ht) 299 return NULL; 300 301 if (TC_U32_KEY(handle) == 0) 302 return ht; 303 304 return u32_lookup_key(ht, handle); 305 } 306 307 /* Protected by rtnl lock */ 308 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr) 309 { 310 int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL); 311 if (id < 0) 312 return 0; 313 return (id | 0x800U) << 20; 314 } 315 316 static struct hlist_head *tc_u_common_hash; 317 318 #define U32_HASH_SHIFT 10 319 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT) 320 321 static void *tc_u_common_ptr(const struct tcf_proto *tp) 322 { 323 struct tcf_block *block = tp->chain->block; 324 325 /* The block sharing is currently supported only 326 * for classless qdiscs. In that case we use block 327 * for tc_u_common identification. In case the 328 * block is not shared, block->q is a valid pointer 329 * and we can use that. That works for classful qdiscs. 330 */ 331 if (tcf_block_shared(block)) 332 return block; 333 else 334 return block->q; 335 } 336 337 static struct hlist_head *tc_u_hash(void *key) 338 { 339 return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT); 340 } 341 342 static struct tc_u_common *tc_u_common_find(void *key) 343 { 344 struct tc_u_common *tc; 345 hlist_for_each_entry(tc, tc_u_hash(key), hnode) { 346 if (tc->ptr == key) 347 return tc; 348 } 349 return NULL; 350 } 351 352 static int u32_init(struct tcf_proto *tp) 353 { 354 struct tc_u_hnode *root_ht; 355 void *key = tc_u_common_ptr(tp); 356 struct tc_u_common *tp_c = tc_u_common_find(key); 357 358 root_ht = kzalloc(struct_size(root_ht, ht, 1), GFP_KERNEL); 359 if (root_ht == NULL) 360 return -ENOBUFS; 361 362 root_ht->refcnt++; 363 root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000; 364 root_ht->prio = tp->prio; 365 root_ht->is_root = true; 366 idr_init(&root_ht->handle_idr); 367 368 if (tp_c == NULL) { 369 tp_c = kzalloc(struct_size(tp_c, hlist->ht, 1), GFP_KERNEL); 370 if (tp_c == NULL) { 371 kfree(root_ht); 372 return -ENOBUFS; 373 } 374 tp_c->ptr = key; 375 INIT_HLIST_NODE(&tp_c->hnode); 376 idr_init(&tp_c->handle_idr); 377 378 hlist_add_head(&tp_c->hnode, tc_u_hash(key)); 379 } 380 381 tp_c->refcnt++; 382 RCU_INIT_POINTER(root_ht->next, tp_c->hlist); 383 rcu_assign_pointer(tp_c->hlist, root_ht); 384 385 root_ht->refcnt++; 386 rcu_assign_pointer(tp->root, root_ht); 387 tp->data = tp_c; 388 return 0; 389 } 390 391 static void __u32_destroy_key(struct tc_u_knode *n) 392 { 393 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); 394 395 tcf_exts_destroy(&n->exts); 396 if (ht && --ht->refcnt == 0) 397 kfree(ht); 398 kfree(n); 399 } 400 401 static void u32_destroy_key(struct tc_u_knode *n, bool free_pf) 402 { 403 tcf_exts_put_net(&n->exts); 404 #ifdef CONFIG_CLS_U32_PERF 405 if (free_pf) 406 free_percpu(n->pf); 407 #endif 408 #ifdef CONFIG_CLS_U32_MARK 409 if (free_pf) 410 free_percpu(n->pcpu_success); 411 #endif 412 __u32_destroy_key(n); 413 } 414 415 /* u32_delete_key_rcu should be called when free'ing a copied 416 * version of a tc_u_knode obtained from u32_init_knode(). When 417 * copies are obtained from u32_init_knode() the statistics are 418 * shared between the old and new copies to allow readers to 419 * continue to update the statistics during the copy. To support 420 * this the u32_delete_key_rcu variant does not free the percpu 421 * statistics. 422 */ 423 static void u32_delete_key_work(struct work_struct *work) 424 { 425 struct tc_u_knode *key = container_of(to_rcu_work(work), 426 struct tc_u_knode, 427 rwork); 428 rtnl_lock(); 429 u32_destroy_key(key, false); 430 rtnl_unlock(); 431 } 432 433 /* u32_delete_key_freepf_rcu is the rcu callback variant 434 * that free's the entire structure including the statistics 435 * percpu variables. Only use this if the key is not a copy 436 * returned by u32_init_knode(). See u32_delete_key_rcu() 437 * for the variant that should be used with keys return from 438 * u32_init_knode() 439 */ 440 static void u32_delete_key_freepf_work(struct work_struct *work) 441 { 442 struct tc_u_knode *key = container_of(to_rcu_work(work), 443 struct tc_u_knode, 444 rwork); 445 rtnl_lock(); 446 u32_destroy_key(key, true); 447 rtnl_unlock(); 448 } 449 450 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) 451 { 452 struct tc_u_common *tp_c = tp->data; 453 struct tc_u_knode __rcu **kp; 454 struct tc_u_knode *pkp; 455 struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); 456 457 if (ht) { 458 kp = &ht->ht[TC_U32_HASH(key->handle)]; 459 for (pkp = rtnl_dereference(*kp); pkp; 460 kp = &pkp->next, pkp = rtnl_dereference(*kp)) { 461 if (pkp == key) { 462 RCU_INIT_POINTER(*kp, key->next); 463 tp_c->knodes--; 464 465 tcf_unbind_filter(tp, &key->res); 466 idr_remove(&ht->handle_idr, key->handle); 467 tcf_exts_get_net(&key->exts); 468 tcf_queue_work(&key->rwork, u32_delete_key_freepf_work); 469 return 0; 470 } 471 } 472 } 473 WARN_ON(1); 474 return 0; 475 } 476 477 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h, 478 struct netlink_ext_ack *extack) 479 { 480 struct tcf_block *block = tp->chain->block; 481 struct tc_cls_u32_offload cls_u32 = {}; 482 483 tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack); 484 cls_u32.command = TC_CLSU32_DELETE_HNODE; 485 cls_u32.hnode.divisor = h->divisor; 486 cls_u32.hnode.handle = h->handle; 487 cls_u32.hnode.prio = h->prio; 488 489 tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, false, true); 490 } 491 492 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h, 493 u32 flags, struct netlink_ext_ack *extack) 494 { 495 struct tcf_block *block = tp->chain->block; 496 struct tc_cls_u32_offload cls_u32 = {}; 497 bool skip_sw = tc_skip_sw(flags); 498 bool offloaded = false; 499 int err; 500 501 tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack); 502 cls_u32.command = TC_CLSU32_NEW_HNODE; 503 cls_u32.hnode.divisor = h->divisor; 504 cls_u32.hnode.handle = h->handle; 505 cls_u32.hnode.prio = h->prio; 506 507 err = tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, skip_sw, true); 508 if (err < 0) { 509 u32_clear_hw_hnode(tp, h, NULL); 510 return err; 511 } else if (err > 0) { 512 offloaded = true; 513 } 514 515 if (skip_sw && !offloaded) 516 return -EINVAL; 517 518 return 0; 519 } 520 521 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, 522 struct netlink_ext_ack *extack) 523 { 524 struct tcf_block *block = tp->chain->block; 525 struct tc_cls_u32_offload cls_u32 = {}; 526 527 tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack); 528 cls_u32.command = TC_CLSU32_DELETE_KNODE; 529 cls_u32.knode.handle = n->handle; 530 531 tc_setup_cb_destroy(block, tp, TC_SETUP_CLSU32, &cls_u32, false, 532 &n->flags, &n->in_hw_count, true); 533 } 534 535 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, 536 u32 flags, struct netlink_ext_ack *extack) 537 { 538 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); 539 struct tcf_block *block = tp->chain->block; 540 struct tc_cls_u32_offload cls_u32 = {}; 541 bool skip_sw = tc_skip_sw(flags); 542 int err; 543 544 tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack); 545 cls_u32.command = TC_CLSU32_REPLACE_KNODE; 546 cls_u32.knode.handle = n->handle; 547 cls_u32.knode.fshift = n->fshift; 548 #ifdef CONFIG_CLS_U32_MARK 549 cls_u32.knode.val = n->val; 550 cls_u32.knode.mask = n->mask; 551 #else 552 cls_u32.knode.val = 0; 553 cls_u32.knode.mask = 0; 554 #endif 555 cls_u32.knode.sel = &n->sel; 556 cls_u32.knode.res = &n->res; 557 cls_u32.knode.exts = &n->exts; 558 if (n->ht_down) 559 cls_u32.knode.link_handle = ht->handle; 560 561 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSU32, &cls_u32, skip_sw, 562 &n->flags, &n->in_hw_count, true); 563 if (err) { 564 u32_remove_hw_knode(tp, n, NULL); 565 return err; 566 } 567 568 if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW)) 569 return -EINVAL; 570 571 return 0; 572 } 573 574 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, 575 struct netlink_ext_ack *extack) 576 { 577 struct tc_u_common *tp_c = tp->data; 578 struct tc_u_knode *n; 579 unsigned int h; 580 581 for (h = 0; h <= ht->divisor; h++) { 582 while ((n = rtnl_dereference(ht->ht[h])) != NULL) { 583 RCU_INIT_POINTER(ht->ht[h], 584 rtnl_dereference(n->next)); 585 tp_c->knodes--; 586 tcf_unbind_filter(tp, &n->res); 587 u32_remove_hw_knode(tp, n, extack); 588 idr_remove(&ht->handle_idr, n->handle); 589 if (tcf_exts_get_net(&n->exts)) 590 tcf_queue_work(&n->rwork, u32_delete_key_freepf_work); 591 else 592 u32_destroy_key(n, true); 593 } 594 } 595 } 596 597 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, 598 struct netlink_ext_ack *extack) 599 { 600 struct tc_u_common *tp_c = tp->data; 601 struct tc_u_hnode __rcu **hn; 602 struct tc_u_hnode *phn; 603 604 WARN_ON(--ht->refcnt); 605 606 u32_clear_hnode(tp, ht, extack); 607 608 hn = &tp_c->hlist; 609 for (phn = rtnl_dereference(*hn); 610 phn; 611 hn = &phn->next, phn = rtnl_dereference(*hn)) { 612 if (phn == ht) { 613 u32_clear_hw_hnode(tp, ht, extack); 614 idr_destroy(&ht->handle_idr); 615 idr_remove(&tp_c->handle_idr, ht->handle); 616 RCU_INIT_POINTER(*hn, ht->next); 617 kfree_rcu(ht, rcu); 618 return 0; 619 } 620 } 621 622 return -ENOENT; 623 } 624 625 static void u32_destroy(struct tcf_proto *tp, bool rtnl_held, 626 struct netlink_ext_ack *extack) 627 { 628 struct tc_u_common *tp_c = tp->data; 629 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); 630 631 WARN_ON(root_ht == NULL); 632 633 if (root_ht && --root_ht->refcnt == 1) 634 u32_destroy_hnode(tp, root_ht, extack); 635 636 if (--tp_c->refcnt == 0) { 637 struct tc_u_hnode *ht; 638 639 hlist_del(&tp_c->hnode); 640 641 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) { 642 u32_clear_hnode(tp, ht, extack); 643 RCU_INIT_POINTER(tp_c->hlist, ht->next); 644 645 /* u32_destroy_key() will later free ht for us, if it's 646 * still referenced by some knode 647 */ 648 if (--ht->refcnt == 0) 649 kfree_rcu(ht, rcu); 650 } 651 652 idr_destroy(&tp_c->handle_idr); 653 kfree(tp_c); 654 } 655 656 tp->data = NULL; 657 } 658 659 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last, 660 bool rtnl_held, struct netlink_ext_ack *extack) 661 { 662 struct tc_u_hnode *ht = arg; 663 struct tc_u_common *tp_c = tp->data; 664 int ret = 0; 665 666 if (TC_U32_KEY(ht->handle)) { 667 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack); 668 ret = u32_delete_key(tp, (struct tc_u_knode *)ht); 669 goto out; 670 } 671 672 if (ht->is_root) { 673 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node"); 674 return -EINVAL; 675 } 676 677 if (ht->refcnt == 1) { 678 u32_destroy_hnode(tp, ht, extack); 679 } else { 680 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter"); 681 return -EBUSY; 682 } 683 684 out: 685 *last = tp_c->refcnt == 1 && tp_c->knodes == 0; 686 return ret; 687 } 688 689 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid) 690 { 691 u32 index = htid | 0x800; 692 u32 max = htid | 0xFFF; 693 694 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) { 695 index = htid + 1; 696 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, 697 GFP_KERNEL)) 698 index = max; 699 } 700 701 return index; 702 } 703 704 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { 705 [TCA_U32_CLASSID] = { .type = NLA_U32 }, 706 [TCA_U32_HASH] = { .type = NLA_U32 }, 707 [TCA_U32_LINK] = { .type = NLA_U32 }, 708 [TCA_U32_DIVISOR] = { .type = NLA_U32 }, 709 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, 710 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, 711 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, 712 [TCA_U32_FLAGS] = { .type = NLA_U32 }, 713 }; 714 715 static int u32_set_parms(struct net *net, struct tcf_proto *tp, 716 unsigned long base, 717 struct tc_u_knode *n, struct nlattr **tb, 718 struct nlattr *est, u32 flags, u32 fl_flags, 719 struct netlink_ext_ack *extack) 720 { 721 int err, ifindex = -1; 722 723 err = tcf_exts_validate_ex(net, tp, tb, est, &n->exts, flags, 724 fl_flags, extack); 725 if (err < 0) 726 return err; 727 728 if (tb[TCA_U32_INDEV]) { 729 ifindex = tcf_change_indev(net, tb[TCA_U32_INDEV], extack); 730 if (ifindex < 0) 731 return -EINVAL; 732 } 733 734 if (tb[TCA_U32_LINK]) { 735 u32 handle = nla_get_u32(tb[TCA_U32_LINK]); 736 struct tc_u_hnode *ht_down = NULL, *ht_old; 737 738 if (TC_U32_KEY(handle)) { 739 NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table"); 740 return -EINVAL; 741 } 742 743 if (handle) { 744 ht_down = u32_lookup_ht(tp->data, handle); 745 746 if (!ht_down) { 747 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found"); 748 return -EINVAL; 749 } 750 if (ht_down->is_root) { 751 NL_SET_ERR_MSG_MOD(extack, "Not linking to root node"); 752 return -EINVAL; 753 } 754 ht_down->refcnt++; 755 } 756 757 ht_old = rtnl_dereference(n->ht_down); 758 rcu_assign_pointer(n->ht_down, ht_down); 759 760 if (ht_old) 761 ht_old->refcnt--; 762 } 763 if (tb[TCA_U32_CLASSID]) { 764 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); 765 tcf_bind_filter(tp, &n->res, base); 766 } 767 768 if (ifindex >= 0) 769 n->ifindex = ifindex; 770 771 return 0; 772 } 773 774 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c, 775 struct tc_u_knode *n) 776 { 777 struct tc_u_knode __rcu **ins; 778 struct tc_u_knode *pins; 779 struct tc_u_hnode *ht; 780 781 if (TC_U32_HTID(n->handle) == TC_U32_ROOT) 782 ht = rtnl_dereference(tp->root); 783 else 784 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle)); 785 786 ins = &ht->ht[TC_U32_HASH(n->handle)]; 787 788 /* The node must always exist for it to be replaced if this is not the 789 * case then something went very wrong elsewhere. 790 */ 791 for (pins = rtnl_dereference(*ins); ; 792 ins = &pins->next, pins = rtnl_dereference(*ins)) 793 if (pins->handle == n->handle) 794 break; 795 796 idr_replace(&ht->handle_idr, n, n->handle); 797 RCU_INIT_POINTER(n->next, pins->next); 798 rcu_assign_pointer(*ins, n); 799 } 800 801 static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp, 802 struct tc_u_knode *n) 803 { 804 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); 805 struct tc_u32_sel *s = &n->sel; 806 struct tc_u_knode *new; 807 808 new = kzalloc(struct_size(new, sel.keys, s->nkeys), GFP_KERNEL); 809 if (!new) 810 return NULL; 811 812 RCU_INIT_POINTER(new->next, n->next); 813 new->handle = n->handle; 814 RCU_INIT_POINTER(new->ht_up, n->ht_up); 815 816 new->ifindex = n->ifindex; 817 new->fshift = n->fshift; 818 new->res = n->res; 819 new->flags = n->flags; 820 RCU_INIT_POINTER(new->ht_down, ht); 821 822 #ifdef CONFIG_CLS_U32_PERF 823 /* Statistics may be incremented by readers during update 824 * so we must keep them in tact. When the node is later destroyed 825 * a special destroy call must be made to not free the pf memory. 826 */ 827 new->pf = n->pf; 828 #endif 829 830 #ifdef CONFIG_CLS_U32_MARK 831 new->val = n->val; 832 new->mask = n->mask; 833 /* Similarly success statistics must be moved as pointers */ 834 new->pcpu_success = n->pcpu_success; 835 #endif 836 memcpy(&new->sel, s, struct_size(s, keys, s->nkeys)); 837 838 if (tcf_exts_init(&new->exts, net, TCA_U32_ACT, TCA_U32_POLICE)) { 839 kfree(new); 840 return NULL; 841 } 842 843 /* bump reference count as long as we hold pointer to structure */ 844 if (ht) 845 ht->refcnt++; 846 847 return new; 848 } 849 850 static int u32_change(struct net *net, struct sk_buff *in_skb, 851 struct tcf_proto *tp, unsigned long base, u32 handle, 852 struct nlattr **tca, void **arg, u32 flags, 853 struct netlink_ext_ack *extack) 854 { 855 struct tc_u_common *tp_c = tp->data; 856 struct tc_u_hnode *ht; 857 struct tc_u_knode *n; 858 struct tc_u32_sel *s; 859 struct nlattr *opt = tca[TCA_OPTIONS]; 860 struct nlattr *tb[TCA_U32_MAX + 1]; 861 u32 htid, userflags = 0; 862 size_t sel_size; 863 int err; 864 865 if (!opt) { 866 if (handle) { 867 NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options"); 868 return -EINVAL; 869 } else { 870 return 0; 871 } 872 } 873 874 err = nla_parse_nested_deprecated(tb, TCA_U32_MAX, opt, u32_policy, 875 extack); 876 if (err < 0) 877 return err; 878 879 if (tb[TCA_U32_FLAGS]) { 880 userflags = nla_get_u32(tb[TCA_U32_FLAGS]); 881 if (!tc_flags_valid(userflags)) { 882 NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags"); 883 return -EINVAL; 884 } 885 } 886 887 n = *arg; 888 if (n) { 889 struct tc_u_knode *new; 890 891 if (TC_U32_KEY(n->handle) == 0) { 892 NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero"); 893 return -EINVAL; 894 } 895 896 if ((n->flags ^ userflags) & 897 ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) { 898 NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags"); 899 return -EINVAL; 900 } 901 902 new = u32_init_knode(net, tp, n); 903 if (!new) 904 return -ENOMEM; 905 906 err = u32_set_parms(net, tp, base, new, tb, 907 tca[TCA_RATE], flags, new->flags, 908 extack); 909 910 if (err) { 911 __u32_destroy_key(new); 912 return err; 913 } 914 915 err = u32_replace_hw_knode(tp, new, flags, extack); 916 if (err) { 917 __u32_destroy_key(new); 918 return err; 919 } 920 921 if (!tc_in_hw(new->flags)) 922 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 923 924 u32_replace_knode(tp, tp_c, new); 925 tcf_unbind_filter(tp, &n->res); 926 tcf_exts_get_net(&n->exts); 927 tcf_queue_work(&n->rwork, u32_delete_key_work); 928 return 0; 929 } 930 931 if (tb[TCA_U32_DIVISOR]) { 932 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); 933 934 if (!is_power_of_2(divisor)) { 935 NL_SET_ERR_MSG_MOD(extack, "Divisor is not a power of 2"); 936 return -EINVAL; 937 } 938 if (divisor-- > 0x100) { 939 NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets"); 940 return -EINVAL; 941 } 942 if (TC_U32_KEY(handle)) { 943 NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table"); 944 return -EINVAL; 945 } 946 ht = kzalloc(struct_size(ht, ht, divisor + 1), GFP_KERNEL); 947 if (ht == NULL) 948 return -ENOBUFS; 949 if (handle == 0) { 950 handle = gen_new_htid(tp->data, ht); 951 if (handle == 0) { 952 kfree(ht); 953 return -ENOMEM; 954 } 955 } else { 956 err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle, 957 handle, GFP_KERNEL); 958 if (err) { 959 kfree(ht); 960 return err; 961 } 962 } 963 ht->refcnt = 1; 964 ht->divisor = divisor; 965 ht->handle = handle; 966 ht->prio = tp->prio; 967 idr_init(&ht->handle_idr); 968 ht->flags = userflags; 969 970 err = u32_replace_hw_hnode(tp, ht, userflags, extack); 971 if (err) { 972 idr_remove(&tp_c->handle_idr, handle); 973 kfree(ht); 974 return err; 975 } 976 977 RCU_INIT_POINTER(ht->next, tp_c->hlist); 978 rcu_assign_pointer(tp_c->hlist, ht); 979 *arg = ht; 980 981 return 0; 982 } 983 984 if (tb[TCA_U32_HASH]) { 985 htid = nla_get_u32(tb[TCA_U32_HASH]); 986 if (TC_U32_HTID(htid) == TC_U32_ROOT) { 987 ht = rtnl_dereference(tp->root); 988 htid = ht->handle; 989 } else { 990 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); 991 if (!ht) { 992 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found"); 993 return -EINVAL; 994 } 995 } 996 } else { 997 ht = rtnl_dereference(tp->root); 998 htid = ht->handle; 999 } 1000 1001 if (ht->divisor < TC_U32_HASH(htid)) { 1002 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value"); 1003 return -EINVAL; 1004 } 1005 1006 if (handle) { 1007 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) { 1008 NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch"); 1009 return -EINVAL; 1010 } 1011 handle = htid | TC_U32_NODE(handle); 1012 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle, 1013 GFP_KERNEL); 1014 if (err) 1015 return err; 1016 } else 1017 handle = gen_new_kid(ht, htid); 1018 1019 if (tb[TCA_U32_SEL] == NULL) { 1020 NL_SET_ERR_MSG_MOD(extack, "Selector not specified"); 1021 err = -EINVAL; 1022 goto erridr; 1023 } 1024 1025 s = nla_data(tb[TCA_U32_SEL]); 1026 sel_size = struct_size(s, keys, s->nkeys); 1027 if (nla_len(tb[TCA_U32_SEL]) < sel_size) { 1028 err = -EINVAL; 1029 goto erridr; 1030 } 1031 1032 n = kzalloc(struct_size(n, sel.keys, s->nkeys), GFP_KERNEL); 1033 if (n == NULL) { 1034 err = -ENOBUFS; 1035 goto erridr; 1036 } 1037 1038 #ifdef CONFIG_CLS_U32_PERF 1039 n->pf = __alloc_percpu(struct_size(n->pf, kcnts, s->nkeys), 1040 __alignof__(struct tc_u32_pcnt)); 1041 if (!n->pf) { 1042 err = -ENOBUFS; 1043 goto errfree; 1044 } 1045 #endif 1046 1047 unsafe_memcpy(&n->sel, s, sel_size, 1048 /* A composite flex-array structure destination, 1049 * which was correctly sized with struct_size(), 1050 * bounds-checked against nla_len(), and allocated 1051 * above. */); 1052 RCU_INIT_POINTER(n->ht_up, ht); 1053 n->handle = handle; 1054 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; 1055 n->flags = userflags; 1056 1057 err = tcf_exts_init(&n->exts, net, TCA_U32_ACT, TCA_U32_POLICE); 1058 if (err < 0) 1059 goto errout; 1060 1061 #ifdef CONFIG_CLS_U32_MARK 1062 n->pcpu_success = alloc_percpu(u32); 1063 if (!n->pcpu_success) { 1064 err = -ENOMEM; 1065 goto errout; 1066 } 1067 1068 if (tb[TCA_U32_MARK]) { 1069 struct tc_u32_mark *mark; 1070 1071 mark = nla_data(tb[TCA_U32_MARK]); 1072 n->val = mark->val; 1073 n->mask = mark->mask; 1074 } 1075 #endif 1076 1077 err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE], 1078 flags, n->flags, extack); 1079 if (err == 0) { 1080 struct tc_u_knode __rcu **ins; 1081 struct tc_u_knode *pins; 1082 1083 err = u32_replace_hw_knode(tp, n, flags, extack); 1084 if (err) 1085 goto errhw; 1086 1087 if (!tc_in_hw(n->flags)) 1088 n->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 1089 1090 ins = &ht->ht[TC_U32_HASH(handle)]; 1091 for (pins = rtnl_dereference(*ins); pins; 1092 ins = &pins->next, pins = rtnl_dereference(*ins)) 1093 if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle)) 1094 break; 1095 1096 RCU_INIT_POINTER(n->next, pins); 1097 rcu_assign_pointer(*ins, n); 1098 tp_c->knodes++; 1099 *arg = n; 1100 return 0; 1101 } 1102 1103 errhw: 1104 #ifdef CONFIG_CLS_U32_MARK 1105 free_percpu(n->pcpu_success); 1106 #endif 1107 1108 errout: 1109 tcf_exts_destroy(&n->exts); 1110 #ifdef CONFIG_CLS_U32_PERF 1111 errfree: 1112 free_percpu(n->pf); 1113 #endif 1114 kfree(n); 1115 erridr: 1116 idr_remove(&ht->handle_idr, handle); 1117 return err; 1118 } 1119 1120 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg, 1121 bool rtnl_held) 1122 { 1123 struct tc_u_common *tp_c = tp->data; 1124 struct tc_u_hnode *ht; 1125 struct tc_u_knode *n; 1126 unsigned int h; 1127 1128 if (arg->stop) 1129 return; 1130 1131 for (ht = rtnl_dereference(tp_c->hlist); 1132 ht; 1133 ht = rtnl_dereference(ht->next)) { 1134 if (ht->prio != tp->prio) 1135 continue; 1136 1137 if (!tc_cls_stats_dump(tp, arg, ht)) 1138 return; 1139 1140 for (h = 0; h <= ht->divisor; h++) { 1141 for (n = rtnl_dereference(ht->ht[h]); 1142 n; 1143 n = rtnl_dereference(n->next)) { 1144 if (!tc_cls_stats_dump(tp, arg, n)) 1145 return; 1146 } 1147 } 1148 } 1149 } 1150 1151 static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, 1152 bool add, flow_setup_cb_t *cb, void *cb_priv, 1153 struct netlink_ext_ack *extack) 1154 { 1155 struct tc_cls_u32_offload cls_u32 = {}; 1156 int err; 1157 1158 tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack); 1159 cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE; 1160 cls_u32.hnode.divisor = ht->divisor; 1161 cls_u32.hnode.handle = ht->handle; 1162 cls_u32.hnode.prio = ht->prio; 1163 1164 err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv); 1165 if (err && add && tc_skip_sw(ht->flags)) 1166 return err; 1167 1168 return 0; 1169 } 1170 1171 static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n, 1172 bool add, flow_setup_cb_t *cb, void *cb_priv, 1173 struct netlink_ext_ack *extack) 1174 { 1175 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); 1176 struct tcf_block *block = tp->chain->block; 1177 struct tc_cls_u32_offload cls_u32 = {}; 1178 1179 tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack); 1180 cls_u32.command = add ? 1181 TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE; 1182 cls_u32.knode.handle = n->handle; 1183 1184 if (add) { 1185 cls_u32.knode.fshift = n->fshift; 1186 #ifdef CONFIG_CLS_U32_MARK 1187 cls_u32.knode.val = n->val; 1188 cls_u32.knode.mask = n->mask; 1189 #else 1190 cls_u32.knode.val = 0; 1191 cls_u32.knode.mask = 0; 1192 #endif 1193 cls_u32.knode.sel = &n->sel; 1194 cls_u32.knode.res = &n->res; 1195 cls_u32.knode.exts = &n->exts; 1196 if (n->ht_down) 1197 cls_u32.knode.link_handle = ht->handle; 1198 } 1199 1200 return tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSU32, 1201 &cls_u32, cb_priv, &n->flags, 1202 &n->in_hw_count); 1203 } 1204 1205 static int u32_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, 1206 void *cb_priv, struct netlink_ext_ack *extack) 1207 { 1208 struct tc_u_common *tp_c = tp->data; 1209 struct tc_u_hnode *ht; 1210 struct tc_u_knode *n; 1211 unsigned int h; 1212 int err; 1213 1214 for (ht = rtnl_dereference(tp_c->hlist); 1215 ht; 1216 ht = rtnl_dereference(ht->next)) { 1217 if (ht->prio != tp->prio) 1218 continue; 1219 1220 /* When adding filters to a new dev, try to offload the 1221 * hashtable first. When removing, do the filters before the 1222 * hashtable. 1223 */ 1224 if (add && !tc_skip_hw(ht->flags)) { 1225 err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv, 1226 extack); 1227 if (err) 1228 return err; 1229 } 1230 1231 for (h = 0; h <= ht->divisor; h++) { 1232 for (n = rtnl_dereference(ht->ht[h]); 1233 n; 1234 n = rtnl_dereference(n->next)) { 1235 if (tc_skip_hw(n->flags)) 1236 continue; 1237 1238 err = u32_reoffload_knode(tp, n, add, cb, 1239 cb_priv, extack); 1240 if (err) 1241 return err; 1242 } 1243 } 1244 1245 if (!add && !tc_skip_hw(ht->flags)) 1246 u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack); 1247 } 1248 1249 return 0; 1250 } 1251 1252 static void u32_bind_class(void *fh, u32 classid, unsigned long cl, void *q, 1253 unsigned long base) 1254 { 1255 struct tc_u_knode *n = fh; 1256 1257 tc_cls_bind_class(classid, cl, q, &n->res, base); 1258 } 1259 1260 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh, 1261 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 1262 { 1263 struct tc_u_knode *n = fh; 1264 struct tc_u_hnode *ht_up, *ht_down; 1265 struct nlattr *nest; 1266 1267 if (n == NULL) 1268 return skb->len; 1269 1270 t->tcm_handle = n->handle; 1271 1272 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 1273 if (nest == NULL) 1274 goto nla_put_failure; 1275 1276 if (TC_U32_KEY(n->handle) == 0) { 1277 struct tc_u_hnode *ht = fh; 1278 u32 divisor = ht->divisor + 1; 1279 1280 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) 1281 goto nla_put_failure; 1282 } else { 1283 #ifdef CONFIG_CLS_U32_PERF 1284 struct tc_u32_pcnt *gpf; 1285 int cpu; 1286 #endif 1287 1288 if (nla_put(skb, TCA_U32_SEL, struct_size(&n->sel, keys, n->sel.nkeys), 1289 &n->sel)) 1290 goto nla_put_failure; 1291 1292 ht_up = rtnl_dereference(n->ht_up); 1293 if (ht_up) { 1294 u32 htid = n->handle & 0xFFFFF000; 1295 if (nla_put_u32(skb, TCA_U32_HASH, htid)) 1296 goto nla_put_failure; 1297 } 1298 if (n->res.classid && 1299 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) 1300 goto nla_put_failure; 1301 1302 ht_down = rtnl_dereference(n->ht_down); 1303 if (ht_down && 1304 nla_put_u32(skb, TCA_U32_LINK, ht_down->handle)) 1305 goto nla_put_failure; 1306 1307 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags)) 1308 goto nla_put_failure; 1309 1310 #ifdef CONFIG_CLS_U32_MARK 1311 if ((n->val || n->mask)) { 1312 struct tc_u32_mark mark = {.val = n->val, 1313 .mask = n->mask, 1314 .success = 0}; 1315 int cpum; 1316 1317 for_each_possible_cpu(cpum) { 1318 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum); 1319 1320 mark.success += cnt; 1321 } 1322 1323 if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark)) 1324 goto nla_put_failure; 1325 } 1326 #endif 1327 1328 if (tcf_exts_dump(skb, &n->exts) < 0) 1329 goto nla_put_failure; 1330 1331 if (n->ifindex) { 1332 struct net_device *dev; 1333 dev = __dev_get_by_index(net, n->ifindex); 1334 if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) 1335 goto nla_put_failure; 1336 } 1337 #ifdef CONFIG_CLS_U32_PERF 1338 gpf = kzalloc(struct_size(gpf, kcnts, n->sel.nkeys), GFP_KERNEL); 1339 if (!gpf) 1340 goto nla_put_failure; 1341 1342 for_each_possible_cpu(cpu) { 1343 int i; 1344 struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu); 1345 1346 gpf->rcnt += pf->rcnt; 1347 gpf->rhit += pf->rhit; 1348 for (i = 0; i < n->sel.nkeys; i++) 1349 gpf->kcnts[i] += pf->kcnts[i]; 1350 } 1351 1352 if (nla_put_64bit(skb, TCA_U32_PCNT, struct_size(gpf, kcnts, n->sel.nkeys), 1353 gpf, TCA_U32_PAD)) { 1354 kfree(gpf); 1355 goto nla_put_failure; 1356 } 1357 kfree(gpf); 1358 #endif 1359 } 1360 1361 nla_nest_end(skb, nest); 1362 1363 if (TC_U32_KEY(n->handle)) 1364 if (tcf_exts_dump_stats(skb, &n->exts) < 0) 1365 goto nla_put_failure; 1366 return skb->len; 1367 1368 nla_put_failure: 1369 nla_nest_cancel(skb, nest); 1370 return -1; 1371 } 1372 1373 static struct tcf_proto_ops cls_u32_ops __read_mostly = { 1374 .kind = "u32", 1375 .classify = u32_classify, 1376 .init = u32_init, 1377 .destroy = u32_destroy, 1378 .get = u32_get, 1379 .change = u32_change, 1380 .delete = u32_delete, 1381 .walk = u32_walk, 1382 .reoffload = u32_reoffload, 1383 .dump = u32_dump, 1384 .bind_class = u32_bind_class, 1385 .owner = THIS_MODULE, 1386 }; 1387 1388 static int __init init_u32(void) 1389 { 1390 int i, ret; 1391 1392 pr_info("u32 classifier\n"); 1393 #ifdef CONFIG_CLS_U32_PERF 1394 pr_info(" Performance counters on\n"); 1395 #endif 1396 pr_info(" input device check on\n"); 1397 #ifdef CONFIG_NET_CLS_ACT 1398 pr_info(" Actions configured\n"); 1399 #endif 1400 tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE, 1401 sizeof(struct hlist_head), 1402 GFP_KERNEL); 1403 if (!tc_u_common_hash) 1404 return -ENOMEM; 1405 1406 for (i = 0; i < U32_HASH_SIZE; i++) 1407 INIT_HLIST_HEAD(&tc_u_common_hash[i]); 1408 1409 ret = register_tcf_proto_ops(&cls_u32_ops); 1410 if (ret) 1411 kvfree(tc_u_common_hash); 1412 return ret; 1413 } 1414 1415 static void __exit exit_u32(void) 1416 { 1417 unregister_tcf_proto_ops(&cls_u32_ops); 1418 kvfree(tc_u_common_hash); 1419 } 1420 1421 module_init(init_u32) 1422 module_exit(exit_u32) 1423 MODULE_LICENSE("GPL"); 1424