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 43 struct tc_u_knode { 44 struct tc_u_knode __rcu *next; 45 u32 handle; 46 struct tc_u_hnode __rcu *ht_up; 47 struct tcf_exts exts; 48 int ifindex; 49 u8 fshift; 50 struct tcf_result res; 51 struct tc_u_hnode __rcu *ht_down; 52 #ifdef CONFIG_CLS_U32_PERF 53 struct tc_u32_pcnt __percpu *pf; 54 #endif 55 u32 flags; 56 unsigned int in_hw_count; 57 #ifdef CONFIG_CLS_U32_MARK 58 u32 val; 59 u32 mask; 60 u32 __percpu *pcpu_success; 61 #endif 62 struct rcu_work rwork; 63 /* The 'sel' field MUST be the last field in structure to allow for 64 * tc_u32_keys allocated at end of structure. 65 */ 66 struct tc_u32_sel sel; 67 }; 68 69 struct tc_u_hnode { 70 struct tc_u_hnode __rcu *next; 71 u32 handle; 72 u32 prio; 73 int refcnt; 74 unsigned int divisor; 75 struct idr handle_idr; 76 bool is_root; 77 struct rcu_head rcu; 78 u32 flags; 79 /* The 'ht' field MUST be the last field in structure to allow for 80 * more entries allocated at end of structure. 81 */ 82 struct tc_u_knode __rcu *ht[1]; 83 }; 84 85 struct tc_u_common { 86 struct tc_u_hnode __rcu *hlist; 87 void *ptr; 88 int refcnt; 89 struct idr handle_idr; 90 struct hlist_node hnode; 91 long knodes; 92 }; 93 94 static inline unsigned int u32_hash_fold(__be32 key, 95 const struct tc_u32_sel *sel, 96 u8 fshift) 97 { 98 unsigned int h = ntohl(key & sel->hmask) >> fshift; 99 100 return h; 101 } 102 103 static int u32_classify(struct sk_buff *skb, const struct tcf_proto *tp, 104 struct tcf_result *res) 105 { 106 struct { 107 struct tc_u_knode *knode; 108 unsigned int off; 109 } stack[TC_U32_MAXDEPTH]; 110 111 struct tc_u_hnode *ht = rcu_dereference_bh(tp->root); 112 unsigned int off = skb_network_offset(skb); 113 struct tc_u_knode *n; 114 int sdepth = 0; 115 int off2 = 0; 116 int sel = 0; 117 #ifdef CONFIG_CLS_U32_PERF 118 int j; 119 #endif 120 int i, r; 121 122 next_ht: 123 n = rcu_dereference_bh(ht->ht[sel]); 124 125 next_knode: 126 if (n) { 127 struct tc_u32_key *key = n->sel.keys; 128 129 #ifdef CONFIG_CLS_U32_PERF 130 __this_cpu_inc(n->pf->rcnt); 131 j = 0; 132 #endif 133 134 if (tc_skip_sw(n->flags)) { 135 n = rcu_dereference_bh(n->next); 136 goto next_knode; 137 } 138 139 #ifdef CONFIG_CLS_U32_MARK 140 if ((skb->mark & n->mask) != n->val) { 141 n = rcu_dereference_bh(n->next); 142 goto next_knode; 143 } else { 144 __this_cpu_inc(*n->pcpu_success); 145 } 146 #endif 147 148 for (i = n->sel.nkeys; i > 0; i--, key++) { 149 int toff = off + key->off + (off2 & key->offmask); 150 __be32 *data, hdata; 151 152 if (skb_headroom(skb) + toff > INT_MAX) 153 goto out; 154 155 data = skb_header_pointer(skb, toff, 4, &hdata); 156 if (!data) 157 goto out; 158 if ((*data ^ key->val) & key->mask) { 159 n = rcu_dereference_bh(n->next); 160 goto next_knode; 161 } 162 #ifdef CONFIG_CLS_U32_PERF 163 __this_cpu_inc(n->pf->kcnts[j]); 164 j++; 165 #endif 166 } 167 168 ht = rcu_dereference_bh(n->ht_down); 169 if (!ht) { 170 check_terminal: 171 if (n->sel.flags & TC_U32_TERMINAL) { 172 173 *res = n->res; 174 if (!tcf_match_indev(skb, n->ifindex)) { 175 n = rcu_dereference_bh(n->next); 176 goto next_knode; 177 } 178 #ifdef CONFIG_CLS_U32_PERF 179 __this_cpu_inc(n->pf->rhit); 180 #endif 181 r = tcf_exts_exec(skb, &n->exts, res); 182 if (r < 0) { 183 n = rcu_dereference_bh(n->next); 184 goto next_knode; 185 } 186 187 return r; 188 } 189 n = rcu_dereference_bh(n->next); 190 goto next_knode; 191 } 192 193 /* PUSH */ 194 if (sdepth >= TC_U32_MAXDEPTH) 195 goto deadloop; 196 stack[sdepth].knode = n; 197 stack[sdepth].off = off; 198 sdepth++; 199 200 ht = rcu_dereference_bh(n->ht_down); 201 sel = 0; 202 if (ht->divisor) { 203 __be32 *data, hdata; 204 205 data = skb_header_pointer(skb, off + n->sel.hoff, 4, 206 &hdata); 207 if (!data) 208 goto out; 209 sel = ht->divisor & u32_hash_fold(*data, &n->sel, 210 n->fshift); 211 } 212 if (!(n->sel.flags & (TC_U32_VAROFFSET | TC_U32_OFFSET | TC_U32_EAT))) 213 goto next_ht; 214 215 if (n->sel.flags & (TC_U32_OFFSET | TC_U32_VAROFFSET)) { 216 off2 = n->sel.off + 3; 217 if (n->sel.flags & TC_U32_VAROFFSET) { 218 __be16 *data, hdata; 219 220 data = skb_header_pointer(skb, 221 off + n->sel.offoff, 222 2, &hdata); 223 if (!data) 224 goto out; 225 off2 += ntohs(n->sel.offmask & *data) >> 226 n->sel.offshift; 227 } 228 off2 &= ~3; 229 } 230 if (n->sel.flags & TC_U32_EAT) { 231 off += off2; 232 off2 = 0; 233 } 234 235 if (off < skb->len) 236 goto next_ht; 237 } 238 239 /* POP */ 240 if (sdepth--) { 241 n = stack[sdepth].knode; 242 ht = rcu_dereference_bh(n->ht_up); 243 off = stack[sdepth].off; 244 goto check_terminal; 245 } 246 out: 247 return -1; 248 249 deadloop: 250 net_warn_ratelimited("cls_u32: dead loop\n"); 251 return -1; 252 } 253 254 static struct tc_u_hnode *u32_lookup_ht(struct tc_u_common *tp_c, u32 handle) 255 { 256 struct tc_u_hnode *ht; 257 258 for (ht = rtnl_dereference(tp_c->hlist); 259 ht; 260 ht = rtnl_dereference(ht->next)) 261 if (ht->handle == handle) 262 break; 263 264 return ht; 265 } 266 267 static struct tc_u_knode *u32_lookup_key(struct tc_u_hnode *ht, u32 handle) 268 { 269 unsigned int sel; 270 struct tc_u_knode *n = NULL; 271 272 sel = TC_U32_HASH(handle); 273 if (sel > ht->divisor) 274 goto out; 275 276 for (n = rtnl_dereference(ht->ht[sel]); 277 n; 278 n = rtnl_dereference(n->next)) 279 if (n->handle == handle) 280 break; 281 out: 282 return n; 283 } 284 285 286 static void *u32_get(struct tcf_proto *tp, u32 handle) 287 { 288 struct tc_u_hnode *ht; 289 struct tc_u_common *tp_c = tp->data; 290 291 if (TC_U32_HTID(handle) == TC_U32_ROOT) 292 ht = rtnl_dereference(tp->root); 293 else 294 ht = u32_lookup_ht(tp_c, TC_U32_HTID(handle)); 295 296 if (!ht) 297 return NULL; 298 299 if (TC_U32_KEY(handle) == 0) 300 return ht; 301 302 return u32_lookup_key(ht, handle); 303 } 304 305 /* Protected by rtnl lock */ 306 static u32 gen_new_htid(struct tc_u_common *tp_c, struct tc_u_hnode *ptr) 307 { 308 int id = idr_alloc_cyclic(&tp_c->handle_idr, ptr, 1, 0x7FF, GFP_KERNEL); 309 if (id < 0) 310 return 0; 311 return (id | 0x800U) << 20; 312 } 313 314 static struct hlist_head *tc_u_common_hash; 315 316 #define U32_HASH_SHIFT 10 317 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT) 318 319 static void *tc_u_common_ptr(const struct tcf_proto *tp) 320 { 321 struct tcf_block *block = tp->chain->block; 322 323 /* The block sharing is currently supported only 324 * for classless qdiscs. In that case we use block 325 * for tc_u_common identification. In case the 326 * block is not shared, block->q is a valid pointer 327 * and we can use that. That works for classful qdiscs. 328 */ 329 if (tcf_block_shared(block)) 330 return block; 331 else 332 return block->q; 333 } 334 335 static struct hlist_head *tc_u_hash(void *key) 336 { 337 return tc_u_common_hash + hash_ptr(key, U32_HASH_SHIFT); 338 } 339 340 static struct tc_u_common *tc_u_common_find(void *key) 341 { 342 struct tc_u_common *tc; 343 hlist_for_each_entry(tc, tc_u_hash(key), hnode) { 344 if (tc->ptr == key) 345 return tc; 346 } 347 return NULL; 348 } 349 350 static int u32_init(struct tcf_proto *tp) 351 { 352 struct tc_u_hnode *root_ht; 353 void *key = tc_u_common_ptr(tp); 354 struct tc_u_common *tp_c = tc_u_common_find(key); 355 356 root_ht = kzalloc(sizeof(*root_ht), GFP_KERNEL); 357 if (root_ht == NULL) 358 return -ENOBUFS; 359 360 root_ht->refcnt++; 361 root_ht->handle = tp_c ? gen_new_htid(tp_c, root_ht) : 0x80000000; 362 root_ht->prio = tp->prio; 363 root_ht->is_root = true; 364 idr_init(&root_ht->handle_idr); 365 366 if (tp_c == NULL) { 367 tp_c = kzalloc(sizeof(*tp_c), GFP_KERNEL); 368 if (tp_c == NULL) { 369 kfree(root_ht); 370 return -ENOBUFS; 371 } 372 tp_c->ptr = key; 373 INIT_HLIST_NODE(&tp_c->hnode); 374 idr_init(&tp_c->handle_idr); 375 376 hlist_add_head(&tp_c->hnode, tc_u_hash(key)); 377 } 378 379 tp_c->refcnt++; 380 RCU_INIT_POINTER(root_ht->next, tp_c->hlist); 381 rcu_assign_pointer(tp_c->hlist, root_ht); 382 383 root_ht->refcnt++; 384 rcu_assign_pointer(tp->root, root_ht); 385 tp->data = tp_c; 386 return 0; 387 } 388 389 static int u32_destroy_key(struct tc_u_knode *n, bool free_pf) 390 { 391 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); 392 393 tcf_exts_destroy(&n->exts); 394 tcf_exts_put_net(&n->exts); 395 if (ht && --ht->refcnt == 0) 396 kfree(ht); 397 #ifdef CONFIG_CLS_U32_PERF 398 if (free_pf) 399 free_percpu(n->pf); 400 #endif 401 #ifdef CONFIG_CLS_U32_MARK 402 if (free_pf) 403 free_percpu(n->pcpu_success); 404 #endif 405 kfree(n); 406 return 0; 407 } 408 409 /* u32_delete_key_rcu should be called when free'ing a copied 410 * version of a tc_u_knode obtained from u32_init_knode(). When 411 * copies are obtained from u32_init_knode() the statistics are 412 * shared between the old and new copies to allow readers to 413 * continue to update the statistics during the copy. To support 414 * this the u32_delete_key_rcu variant does not free the percpu 415 * statistics. 416 */ 417 static void u32_delete_key_work(struct work_struct *work) 418 { 419 struct tc_u_knode *key = container_of(to_rcu_work(work), 420 struct tc_u_knode, 421 rwork); 422 rtnl_lock(); 423 u32_destroy_key(key, false); 424 rtnl_unlock(); 425 } 426 427 /* u32_delete_key_freepf_rcu is the rcu callback variant 428 * that free's the entire structure including the statistics 429 * percpu variables. Only use this if the key is not a copy 430 * returned by u32_init_knode(). See u32_delete_key_rcu() 431 * for the variant that should be used with keys return from 432 * u32_init_knode() 433 */ 434 static void u32_delete_key_freepf_work(struct work_struct *work) 435 { 436 struct tc_u_knode *key = container_of(to_rcu_work(work), 437 struct tc_u_knode, 438 rwork); 439 rtnl_lock(); 440 u32_destroy_key(key, true); 441 rtnl_unlock(); 442 } 443 444 static int u32_delete_key(struct tcf_proto *tp, struct tc_u_knode *key) 445 { 446 struct tc_u_common *tp_c = tp->data; 447 struct tc_u_knode __rcu **kp; 448 struct tc_u_knode *pkp; 449 struct tc_u_hnode *ht = rtnl_dereference(key->ht_up); 450 451 if (ht) { 452 kp = &ht->ht[TC_U32_HASH(key->handle)]; 453 for (pkp = rtnl_dereference(*kp); pkp; 454 kp = &pkp->next, pkp = rtnl_dereference(*kp)) { 455 if (pkp == key) { 456 RCU_INIT_POINTER(*kp, key->next); 457 tp_c->knodes--; 458 459 tcf_unbind_filter(tp, &key->res); 460 idr_remove(&ht->handle_idr, key->handle); 461 tcf_exts_get_net(&key->exts); 462 tcf_queue_work(&key->rwork, u32_delete_key_freepf_work); 463 return 0; 464 } 465 } 466 } 467 WARN_ON(1); 468 return 0; 469 } 470 471 static void u32_clear_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h, 472 struct netlink_ext_ack *extack) 473 { 474 struct tcf_block *block = tp->chain->block; 475 struct tc_cls_u32_offload cls_u32 = {}; 476 477 tc_cls_common_offload_init(&cls_u32.common, tp, h->flags, extack); 478 cls_u32.command = TC_CLSU32_DELETE_HNODE; 479 cls_u32.hnode.divisor = h->divisor; 480 cls_u32.hnode.handle = h->handle; 481 cls_u32.hnode.prio = h->prio; 482 483 tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, false, true); 484 } 485 486 static int u32_replace_hw_hnode(struct tcf_proto *tp, struct tc_u_hnode *h, 487 u32 flags, struct netlink_ext_ack *extack) 488 { 489 struct tcf_block *block = tp->chain->block; 490 struct tc_cls_u32_offload cls_u32 = {}; 491 bool skip_sw = tc_skip_sw(flags); 492 bool offloaded = false; 493 int err; 494 495 tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack); 496 cls_u32.command = TC_CLSU32_NEW_HNODE; 497 cls_u32.hnode.divisor = h->divisor; 498 cls_u32.hnode.handle = h->handle; 499 cls_u32.hnode.prio = h->prio; 500 501 err = tc_setup_cb_call(block, TC_SETUP_CLSU32, &cls_u32, skip_sw, true); 502 if (err < 0) { 503 u32_clear_hw_hnode(tp, h, NULL); 504 return err; 505 } else if (err > 0) { 506 offloaded = true; 507 } 508 509 if (skip_sw && !offloaded) 510 return -EINVAL; 511 512 return 0; 513 } 514 515 static void u32_remove_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, 516 struct netlink_ext_ack *extack) 517 { 518 struct tcf_block *block = tp->chain->block; 519 struct tc_cls_u32_offload cls_u32 = {}; 520 521 tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack); 522 cls_u32.command = TC_CLSU32_DELETE_KNODE; 523 cls_u32.knode.handle = n->handle; 524 525 tc_setup_cb_destroy(block, tp, TC_SETUP_CLSU32, &cls_u32, false, 526 &n->flags, &n->in_hw_count, true); 527 } 528 529 static int u32_replace_hw_knode(struct tcf_proto *tp, struct tc_u_knode *n, 530 u32 flags, struct netlink_ext_ack *extack) 531 { 532 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); 533 struct tcf_block *block = tp->chain->block; 534 struct tc_cls_u32_offload cls_u32 = {}; 535 bool skip_sw = tc_skip_sw(flags); 536 int err; 537 538 tc_cls_common_offload_init(&cls_u32.common, tp, flags, extack); 539 cls_u32.command = TC_CLSU32_REPLACE_KNODE; 540 cls_u32.knode.handle = n->handle; 541 cls_u32.knode.fshift = n->fshift; 542 #ifdef CONFIG_CLS_U32_MARK 543 cls_u32.knode.val = n->val; 544 cls_u32.knode.mask = n->mask; 545 #else 546 cls_u32.knode.val = 0; 547 cls_u32.knode.mask = 0; 548 #endif 549 cls_u32.knode.sel = &n->sel; 550 cls_u32.knode.res = &n->res; 551 cls_u32.knode.exts = &n->exts; 552 if (n->ht_down) 553 cls_u32.knode.link_handle = ht->handle; 554 555 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSU32, &cls_u32, skip_sw, 556 &n->flags, &n->in_hw_count, true); 557 if (err) { 558 u32_remove_hw_knode(tp, n, NULL); 559 return err; 560 } 561 562 if (skip_sw && !(n->flags & TCA_CLS_FLAGS_IN_HW)) 563 return -EINVAL; 564 565 return 0; 566 } 567 568 static void u32_clear_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, 569 struct netlink_ext_ack *extack) 570 { 571 struct tc_u_common *tp_c = tp->data; 572 struct tc_u_knode *n; 573 unsigned int h; 574 575 for (h = 0; h <= ht->divisor; h++) { 576 while ((n = rtnl_dereference(ht->ht[h])) != NULL) { 577 RCU_INIT_POINTER(ht->ht[h], 578 rtnl_dereference(n->next)); 579 tp_c->knodes--; 580 tcf_unbind_filter(tp, &n->res); 581 u32_remove_hw_knode(tp, n, extack); 582 idr_remove(&ht->handle_idr, n->handle); 583 if (tcf_exts_get_net(&n->exts)) 584 tcf_queue_work(&n->rwork, u32_delete_key_freepf_work); 585 else 586 u32_destroy_key(n, true); 587 } 588 } 589 } 590 591 static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, 592 struct netlink_ext_ack *extack) 593 { 594 struct tc_u_common *tp_c = tp->data; 595 struct tc_u_hnode __rcu **hn; 596 struct tc_u_hnode *phn; 597 598 WARN_ON(--ht->refcnt); 599 600 u32_clear_hnode(tp, ht, extack); 601 602 hn = &tp_c->hlist; 603 for (phn = rtnl_dereference(*hn); 604 phn; 605 hn = &phn->next, phn = rtnl_dereference(*hn)) { 606 if (phn == ht) { 607 u32_clear_hw_hnode(tp, ht, extack); 608 idr_destroy(&ht->handle_idr); 609 idr_remove(&tp_c->handle_idr, ht->handle); 610 RCU_INIT_POINTER(*hn, ht->next); 611 kfree_rcu(ht, rcu); 612 return 0; 613 } 614 } 615 616 return -ENOENT; 617 } 618 619 static void u32_destroy(struct tcf_proto *tp, bool rtnl_held, 620 struct netlink_ext_ack *extack) 621 { 622 struct tc_u_common *tp_c = tp->data; 623 struct tc_u_hnode *root_ht = rtnl_dereference(tp->root); 624 625 WARN_ON(root_ht == NULL); 626 627 if (root_ht && --root_ht->refcnt == 1) 628 u32_destroy_hnode(tp, root_ht, extack); 629 630 if (--tp_c->refcnt == 0) { 631 struct tc_u_hnode *ht; 632 633 hlist_del(&tp_c->hnode); 634 635 while ((ht = rtnl_dereference(tp_c->hlist)) != NULL) { 636 u32_clear_hnode(tp, ht, extack); 637 RCU_INIT_POINTER(tp_c->hlist, ht->next); 638 639 /* u32_destroy_key() will later free ht for us, if it's 640 * still referenced by some knode 641 */ 642 if (--ht->refcnt == 0) 643 kfree_rcu(ht, rcu); 644 } 645 646 idr_destroy(&tp_c->handle_idr); 647 kfree(tp_c); 648 } 649 650 tp->data = NULL; 651 } 652 653 static int u32_delete(struct tcf_proto *tp, void *arg, bool *last, 654 bool rtnl_held, struct netlink_ext_ack *extack) 655 { 656 struct tc_u_hnode *ht = arg; 657 struct tc_u_common *tp_c = tp->data; 658 int ret = 0; 659 660 if (TC_U32_KEY(ht->handle)) { 661 u32_remove_hw_knode(tp, (struct tc_u_knode *)ht, extack); 662 ret = u32_delete_key(tp, (struct tc_u_knode *)ht); 663 goto out; 664 } 665 666 if (ht->is_root) { 667 NL_SET_ERR_MSG_MOD(extack, "Not allowed to delete root node"); 668 return -EINVAL; 669 } 670 671 if (ht->refcnt == 1) { 672 u32_destroy_hnode(tp, ht, extack); 673 } else { 674 NL_SET_ERR_MSG_MOD(extack, "Can not delete in-use filter"); 675 return -EBUSY; 676 } 677 678 out: 679 *last = tp_c->refcnt == 1 && tp_c->knodes == 0; 680 return ret; 681 } 682 683 static u32 gen_new_kid(struct tc_u_hnode *ht, u32 htid) 684 { 685 u32 index = htid | 0x800; 686 u32 max = htid | 0xFFF; 687 688 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, GFP_KERNEL)) { 689 index = htid + 1; 690 if (idr_alloc_u32(&ht->handle_idr, NULL, &index, max, 691 GFP_KERNEL)) 692 index = max; 693 } 694 695 return index; 696 } 697 698 static const struct nla_policy u32_policy[TCA_U32_MAX + 1] = { 699 [TCA_U32_CLASSID] = { .type = NLA_U32 }, 700 [TCA_U32_HASH] = { .type = NLA_U32 }, 701 [TCA_U32_LINK] = { .type = NLA_U32 }, 702 [TCA_U32_DIVISOR] = { .type = NLA_U32 }, 703 [TCA_U32_SEL] = { .len = sizeof(struct tc_u32_sel) }, 704 [TCA_U32_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, 705 [TCA_U32_MARK] = { .len = sizeof(struct tc_u32_mark) }, 706 [TCA_U32_FLAGS] = { .type = NLA_U32 }, 707 }; 708 709 static int u32_set_parms(struct net *net, struct tcf_proto *tp, 710 unsigned long base, 711 struct tc_u_knode *n, struct nlattr **tb, 712 struct nlattr *est, bool ovr, 713 struct netlink_ext_ack *extack) 714 { 715 int err; 716 717 err = tcf_exts_validate(net, tp, tb, est, &n->exts, ovr, true, extack); 718 if (err < 0) 719 return err; 720 721 if (tb[TCA_U32_LINK]) { 722 u32 handle = nla_get_u32(tb[TCA_U32_LINK]); 723 struct tc_u_hnode *ht_down = NULL, *ht_old; 724 725 if (TC_U32_KEY(handle)) { 726 NL_SET_ERR_MSG_MOD(extack, "u32 Link handle must be a hash table"); 727 return -EINVAL; 728 } 729 730 if (handle) { 731 ht_down = u32_lookup_ht(tp->data, handle); 732 733 if (!ht_down) { 734 NL_SET_ERR_MSG_MOD(extack, "Link hash table not found"); 735 return -EINVAL; 736 } 737 if (ht_down->is_root) { 738 NL_SET_ERR_MSG_MOD(extack, "Not linking to root node"); 739 return -EINVAL; 740 } 741 ht_down->refcnt++; 742 } 743 744 ht_old = rtnl_dereference(n->ht_down); 745 rcu_assign_pointer(n->ht_down, ht_down); 746 747 if (ht_old) 748 ht_old->refcnt--; 749 } 750 if (tb[TCA_U32_CLASSID]) { 751 n->res.classid = nla_get_u32(tb[TCA_U32_CLASSID]); 752 tcf_bind_filter(tp, &n->res, base); 753 } 754 755 if (tb[TCA_U32_INDEV]) { 756 int ret; 757 ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack); 758 if (ret < 0) 759 return -EINVAL; 760 n->ifindex = ret; 761 } 762 return 0; 763 } 764 765 static void u32_replace_knode(struct tcf_proto *tp, struct tc_u_common *tp_c, 766 struct tc_u_knode *n) 767 { 768 struct tc_u_knode __rcu **ins; 769 struct tc_u_knode *pins; 770 struct tc_u_hnode *ht; 771 772 if (TC_U32_HTID(n->handle) == TC_U32_ROOT) 773 ht = rtnl_dereference(tp->root); 774 else 775 ht = u32_lookup_ht(tp_c, TC_U32_HTID(n->handle)); 776 777 ins = &ht->ht[TC_U32_HASH(n->handle)]; 778 779 /* The node must always exist for it to be replaced if this is not the 780 * case then something went very wrong elsewhere. 781 */ 782 for (pins = rtnl_dereference(*ins); ; 783 ins = &pins->next, pins = rtnl_dereference(*ins)) 784 if (pins->handle == n->handle) 785 break; 786 787 idr_replace(&ht->handle_idr, n, n->handle); 788 RCU_INIT_POINTER(n->next, pins->next); 789 rcu_assign_pointer(*ins, n); 790 } 791 792 static struct tc_u_knode *u32_init_knode(struct net *net, struct tcf_proto *tp, 793 struct tc_u_knode *n) 794 { 795 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); 796 struct tc_u32_sel *s = &n->sel; 797 struct tc_u_knode *new; 798 799 new = kzalloc(struct_size(new, sel.keys, s->nkeys), GFP_KERNEL); 800 if (!new) 801 return NULL; 802 803 RCU_INIT_POINTER(new->next, n->next); 804 new->handle = n->handle; 805 RCU_INIT_POINTER(new->ht_up, n->ht_up); 806 807 new->ifindex = n->ifindex; 808 new->fshift = n->fshift; 809 new->res = n->res; 810 new->flags = n->flags; 811 RCU_INIT_POINTER(new->ht_down, ht); 812 813 /* bump reference count as long as we hold pointer to structure */ 814 if (ht) 815 ht->refcnt++; 816 817 #ifdef CONFIG_CLS_U32_PERF 818 /* Statistics may be incremented by readers during update 819 * so we must keep them in tact. When the node is later destroyed 820 * a special destroy call must be made to not free the pf memory. 821 */ 822 new->pf = n->pf; 823 #endif 824 825 #ifdef CONFIG_CLS_U32_MARK 826 new->val = n->val; 827 new->mask = n->mask; 828 /* Similarly success statistics must be moved as pointers */ 829 new->pcpu_success = n->pcpu_success; 830 #endif 831 memcpy(&new->sel, s, struct_size(s, keys, s->nkeys)); 832 833 if (tcf_exts_init(&new->exts, net, TCA_U32_ACT, TCA_U32_POLICE)) { 834 kfree(new); 835 return NULL; 836 } 837 838 return new; 839 } 840 841 static int u32_change(struct net *net, struct sk_buff *in_skb, 842 struct tcf_proto *tp, unsigned long base, u32 handle, 843 struct nlattr **tca, void **arg, bool ovr, bool rtnl_held, 844 struct netlink_ext_ack *extack) 845 { 846 struct tc_u_common *tp_c = tp->data; 847 struct tc_u_hnode *ht; 848 struct tc_u_knode *n; 849 struct tc_u32_sel *s; 850 struct nlattr *opt = tca[TCA_OPTIONS]; 851 struct nlattr *tb[TCA_U32_MAX + 1]; 852 u32 htid, flags = 0; 853 size_t sel_size; 854 int err; 855 856 if (!opt) { 857 if (handle) { 858 NL_SET_ERR_MSG_MOD(extack, "Filter handle requires options"); 859 return -EINVAL; 860 } else { 861 return 0; 862 } 863 } 864 865 err = nla_parse_nested_deprecated(tb, TCA_U32_MAX, opt, u32_policy, 866 extack); 867 if (err < 0) 868 return err; 869 870 if (tb[TCA_U32_FLAGS]) { 871 flags = nla_get_u32(tb[TCA_U32_FLAGS]); 872 if (!tc_flags_valid(flags)) { 873 NL_SET_ERR_MSG_MOD(extack, "Invalid filter flags"); 874 return -EINVAL; 875 } 876 } 877 878 n = *arg; 879 if (n) { 880 struct tc_u_knode *new; 881 882 if (TC_U32_KEY(n->handle) == 0) { 883 NL_SET_ERR_MSG_MOD(extack, "Key node id cannot be zero"); 884 return -EINVAL; 885 } 886 887 if ((n->flags ^ flags) & 888 ~(TCA_CLS_FLAGS_IN_HW | TCA_CLS_FLAGS_NOT_IN_HW)) { 889 NL_SET_ERR_MSG_MOD(extack, "Key node flags do not match passed flags"); 890 return -EINVAL; 891 } 892 893 new = u32_init_knode(net, tp, n); 894 if (!new) 895 return -ENOMEM; 896 897 err = u32_set_parms(net, tp, base, new, tb, 898 tca[TCA_RATE], ovr, extack); 899 900 if (err) { 901 u32_destroy_key(new, false); 902 return err; 903 } 904 905 err = u32_replace_hw_knode(tp, new, flags, extack); 906 if (err) { 907 u32_destroy_key(new, false); 908 return err; 909 } 910 911 if (!tc_in_hw(new->flags)) 912 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 913 914 u32_replace_knode(tp, tp_c, new); 915 tcf_unbind_filter(tp, &n->res); 916 tcf_exts_get_net(&n->exts); 917 tcf_queue_work(&n->rwork, u32_delete_key_work); 918 return 0; 919 } 920 921 if (tb[TCA_U32_DIVISOR]) { 922 unsigned int divisor = nla_get_u32(tb[TCA_U32_DIVISOR]); 923 924 if (!is_power_of_2(divisor)) { 925 NL_SET_ERR_MSG_MOD(extack, "Divisor is not a power of 2"); 926 return -EINVAL; 927 } 928 if (divisor-- > 0x100) { 929 NL_SET_ERR_MSG_MOD(extack, "Exceeded maximum 256 hash buckets"); 930 return -EINVAL; 931 } 932 if (TC_U32_KEY(handle)) { 933 NL_SET_ERR_MSG_MOD(extack, "Divisor can only be used on a hash table"); 934 return -EINVAL; 935 } 936 ht = kzalloc(sizeof(*ht) + divisor*sizeof(void *), GFP_KERNEL); 937 if (ht == NULL) 938 return -ENOBUFS; 939 if (handle == 0) { 940 handle = gen_new_htid(tp->data, ht); 941 if (handle == 0) { 942 kfree(ht); 943 return -ENOMEM; 944 } 945 } else { 946 err = idr_alloc_u32(&tp_c->handle_idr, ht, &handle, 947 handle, GFP_KERNEL); 948 if (err) { 949 kfree(ht); 950 return err; 951 } 952 } 953 ht->refcnt = 1; 954 ht->divisor = divisor; 955 ht->handle = handle; 956 ht->prio = tp->prio; 957 idr_init(&ht->handle_idr); 958 ht->flags = flags; 959 960 err = u32_replace_hw_hnode(tp, ht, flags, extack); 961 if (err) { 962 idr_remove(&tp_c->handle_idr, handle); 963 kfree(ht); 964 return err; 965 } 966 967 RCU_INIT_POINTER(ht->next, tp_c->hlist); 968 rcu_assign_pointer(tp_c->hlist, ht); 969 *arg = ht; 970 971 return 0; 972 } 973 974 if (tb[TCA_U32_HASH]) { 975 htid = nla_get_u32(tb[TCA_U32_HASH]); 976 if (TC_U32_HTID(htid) == TC_U32_ROOT) { 977 ht = rtnl_dereference(tp->root); 978 htid = ht->handle; 979 } else { 980 ht = u32_lookup_ht(tp->data, TC_U32_HTID(htid)); 981 if (!ht) { 982 NL_SET_ERR_MSG_MOD(extack, "Specified hash table not found"); 983 return -EINVAL; 984 } 985 } 986 } else { 987 ht = rtnl_dereference(tp->root); 988 htid = ht->handle; 989 } 990 991 if (ht->divisor < TC_U32_HASH(htid)) { 992 NL_SET_ERR_MSG_MOD(extack, "Specified hash table buckets exceed configured value"); 993 return -EINVAL; 994 } 995 996 if (handle) { 997 if (TC_U32_HTID(handle) && TC_U32_HTID(handle ^ htid)) { 998 NL_SET_ERR_MSG_MOD(extack, "Handle specified hash table address mismatch"); 999 return -EINVAL; 1000 } 1001 handle = htid | TC_U32_NODE(handle); 1002 err = idr_alloc_u32(&ht->handle_idr, NULL, &handle, handle, 1003 GFP_KERNEL); 1004 if (err) 1005 return err; 1006 } else 1007 handle = gen_new_kid(ht, htid); 1008 1009 if (tb[TCA_U32_SEL] == NULL) { 1010 NL_SET_ERR_MSG_MOD(extack, "Selector not specified"); 1011 err = -EINVAL; 1012 goto erridr; 1013 } 1014 1015 s = nla_data(tb[TCA_U32_SEL]); 1016 sel_size = struct_size(s, keys, s->nkeys); 1017 if (nla_len(tb[TCA_U32_SEL]) < sel_size) { 1018 err = -EINVAL; 1019 goto erridr; 1020 } 1021 1022 n = kzalloc(struct_size(n, sel.keys, s->nkeys), GFP_KERNEL); 1023 if (n == NULL) { 1024 err = -ENOBUFS; 1025 goto erridr; 1026 } 1027 1028 #ifdef CONFIG_CLS_U32_PERF 1029 n->pf = __alloc_percpu(struct_size(n->pf, kcnts, s->nkeys), 1030 __alignof__(struct tc_u32_pcnt)); 1031 if (!n->pf) { 1032 err = -ENOBUFS; 1033 goto errfree; 1034 } 1035 #endif 1036 1037 memcpy(&n->sel, s, sel_size); 1038 RCU_INIT_POINTER(n->ht_up, ht); 1039 n->handle = handle; 1040 n->fshift = s->hmask ? ffs(ntohl(s->hmask)) - 1 : 0; 1041 n->flags = flags; 1042 1043 err = tcf_exts_init(&n->exts, net, TCA_U32_ACT, TCA_U32_POLICE); 1044 if (err < 0) 1045 goto errout; 1046 1047 #ifdef CONFIG_CLS_U32_MARK 1048 n->pcpu_success = alloc_percpu(u32); 1049 if (!n->pcpu_success) { 1050 err = -ENOMEM; 1051 goto errout; 1052 } 1053 1054 if (tb[TCA_U32_MARK]) { 1055 struct tc_u32_mark *mark; 1056 1057 mark = nla_data(tb[TCA_U32_MARK]); 1058 n->val = mark->val; 1059 n->mask = mark->mask; 1060 } 1061 #endif 1062 1063 err = u32_set_parms(net, tp, base, n, tb, tca[TCA_RATE], ovr, 1064 extack); 1065 if (err == 0) { 1066 struct tc_u_knode __rcu **ins; 1067 struct tc_u_knode *pins; 1068 1069 err = u32_replace_hw_knode(tp, n, flags, extack); 1070 if (err) 1071 goto errhw; 1072 1073 if (!tc_in_hw(n->flags)) 1074 n->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 1075 1076 ins = &ht->ht[TC_U32_HASH(handle)]; 1077 for (pins = rtnl_dereference(*ins); pins; 1078 ins = &pins->next, pins = rtnl_dereference(*ins)) 1079 if (TC_U32_NODE(handle) < TC_U32_NODE(pins->handle)) 1080 break; 1081 1082 RCU_INIT_POINTER(n->next, pins); 1083 rcu_assign_pointer(*ins, n); 1084 tp_c->knodes++; 1085 *arg = n; 1086 return 0; 1087 } 1088 1089 errhw: 1090 #ifdef CONFIG_CLS_U32_MARK 1091 free_percpu(n->pcpu_success); 1092 #endif 1093 1094 errout: 1095 tcf_exts_destroy(&n->exts); 1096 #ifdef CONFIG_CLS_U32_PERF 1097 errfree: 1098 free_percpu(n->pf); 1099 #endif 1100 kfree(n); 1101 erridr: 1102 idr_remove(&ht->handle_idr, handle); 1103 return err; 1104 } 1105 1106 static void u32_walk(struct tcf_proto *tp, struct tcf_walker *arg, 1107 bool rtnl_held) 1108 { 1109 struct tc_u_common *tp_c = tp->data; 1110 struct tc_u_hnode *ht; 1111 struct tc_u_knode *n; 1112 unsigned int h; 1113 1114 if (arg->stop) 1115 return; 1116 1117 for (ht = rtnl_dereference(tp_c->hlist); 1118 ht; 1119 ht = rtnl_dereference(ht->next)) { 1120 if (ht->prio != tp->prio) 1121 continue; 1122 if (arg->count >= arg->skip) { 1123 if (arg->fn(tp, ht, arg) < 0) { 1124 arg->stop = 1; 1125 return; 1126 } 1127 } 1128 arg->count++; 1129 for (h = 0; h <= ht->divisor; h++) { 1130 for (n = rtnl_dereference(ht->ht[h]); 1131 n; 1132 n = rtnl_dereference(n->next)) { 1133 if (arg->count < arg->skip) { 1134 arg->count++; 1135 continue; 1136 } 1137 if (arg->fn(tp, n, arg) < 0) { 1138 arg->stop = 1; 1139 return; 1140 } 1141 arg->count++; 1142 } 1143 } 1144 } 1145 } 1146 1147 static int u32_reoffload_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht, 1148 bool add, flow_setup_cb_t *cb, void *cb_priv, 1149 struct netlink_ext_ack *extack) 1150 { 1151 struct tc_cls_u32_offload cls_u32 = {}; 1152 int err; 1153 1154 tc_cls_common_offload_init(&cls_u32.common, tp, ht->flags, extack); 1155 cls_u32.command = add ? TC_CLSU32_NEW_HNODE : TC_CLSU32_DELETE_HNODE; 1156 cls_u32.hnode.divisor = ht->divisor; 1157 cls_u32.hnode.handle = ht->handle; 1158 cls_u32.hnode.prio = ht->prio; 1159 1160 err = cb(TC_SETUP_CLSU32, &cls_u32, cb_priv); 1161 if (err && add && tc_skip_sw(ht->flags)) 1162 return err; 1163 1164 return 0; 1165 } 1166 1167 static int u32_reoffload_knode(struct tcf_proto *tp, struct tc_u_knode *n, 1168 bool add, flow_setup_cb_t *cb, void *cb_priv, 1169 struct netlink_ext_ack *extack) 1170 { 1171 struct tc_u_hnode *ht = rtnl_dereference(n->ht_down); 1172 struct tcf_block *block = tp->chain->block; 1173 struct tc_cls_u32_offload cls_u32 = {}; 1174 int err; 1175 1176 tc_cls_common_offload_init(&cls_u32.common, tp, n->flags, extack); 1177 cls_u32.command = add ? 1178 TC_CLSU32_REPLACE_KNODE : TC_CLSU32_DELETE_KNODE; 1179 cls_u32.knode.handle = n->handle; 1180 1181 if (add) { 1182 cls_u32.knode.fshift = n->fshift; 1183 #ifdef CONFIG_CLS_U32_MARK 1184 cls_u32.knode.val = n->val; 1185 cls_u32.knode.mask = n->mask; 1186 #else 1187 cls_u32.knode.val = 0; 1188 cls_u32.knode.mask = 0; 1189 #endif 1190 cls_u32.knode.sel = &n->sel; 1191 cls_u32.knode.res = &n->res; 1192 cls_u32.knode.exts = &n->exts; 1193 if (n->ht_down) 1194 cls_u32.knode.link_handle = ht->handle; 1195 } 1196 1197 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSU32, 1198 &cls_u32, cb_priv, &n->flags, 1199 &n->in_hw_count); 1200 if (err) 1201 return err; 1202 1203 return 0; 1204 } 1205 1206 static int u32_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, 1207 void *cb_priv, struct netlink_ext_ack *extack) 1208 { 1209 struct tc_u_common *tp_c = tp->data; 1210 struct tc_u_hnode *ht; 1211 struct tc_u_knode *n; 1212 unsigned int h; 1213 int err; 1214 1215 for (ht = rtnl_dereference(tp_c->hlist); 1216 ht; 1217 ht = rtnl_dereference(ht->next)) { 1218 if (ht->prio != tp->prio) 1219 continue; 1220 1221 /* When adding filters to a new dev, try to offload the 1222 * hashtable first. When removing, do the filters before the 1223 * hashtable. 1224 */ 1225 if (add && !tc_skip_hw(ht->flags)) { 1226 err = u32_reoffload_hnode(tp, ht, add, cb, cb_priv, 1227 extack); 1228 if (err) 1229 return err; 1230 } 1231 1232 for (h = 0; h <= ht->divisor; h++) { 1233 for (n = rtnl_dereference(ht->ht[h]); 1234 n; 1235 n = rtnl_dereference(n->next)) { 1236 if (tc_skip_hw(n->flags)) 1237 continue; 1238 1239 err = u32_reoffload_knode(tp, n, add, cb, 1240 cb_priv, extack); 1241 if (err) 1242 return err; 1243 } 1244 } 1245 1246 if (!add && !tc_skip_hw(ht->flags)) 1247 u32_reoffload_hnode(tp, ht, add, cb, cb_priv, extack); 1248 } 1249 1250 return 0; 1251 } 1252 1253 static void u32_bind_class(void *fh, u32 classid, unsigned long cl, void *q, 1254 unsigned long base) 1255 { 1256 struct tc_u_knode *n = fh; 1257 1258 if (n && n->res.classid == classid) { 1259 if (cl) 1260 __tcf_bind_filter(q, &n->res, base); 1261 else 1262 __tcf_unbind_filter(q, &n->res); 1263 } 1264 } 1265 1266 static int u32_dump(struct net *net, struct tcf_proto *tp, void *fh, 1267 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) 1268 { 1269 struct tc_u_knode *n = fh; 1270 struct tc_u_hnode *ht_up, *ht_down; 1271 struct nlattr *nest; 1272 1273 if (n == NULL) 1274 return skb->len; 1275 1276 t->tcm_handle = n->handle; 1277 1278 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 1279 if (nest == NULL) 1280 goto nla_put_failure; 1281 1282 if (TC_U32_KEY(n->handle) == 0) { 1283 struct tc_u_hnode *ht = fh; 1284 u32 divisor = ht->divisor + 1; 1285 1286 if (nla_put_u32(skb, TCA_U32_DIVISOR, divisor)) 1287 goto nla_put_failure; 1288 } else { 1289 #ifdef CONFIG_CLS_U32_PERF 1290 struct tc_u32_pcnt *gpf; 1291 int cpu; 1292 #endif 1293 1294 if (nla_put(skb, TCA_U32_SEL, struct_size(&n->sel, keys, n->sel.nkeys), 1295 &n->sel)) 1296 goto nla_put_failure; 1297 1298 ht_up = rtnl_dereference(n->ht_up); 1299 if (ht_up) { 1300 u32 htid = n->handle & 0xFFFFF000; 1301 if (nla_put_u32(skb, TCA_U32_HASH, htid)) 1302 goto nla_put_failure; 1303 } 1304 if (n->res.classid && 1305 nla_put_u32(skb, TCA_U32_CLASSID, n->res.classid)) 1306 goto nla_put_failure; 1307 1308 ht_down = rtnl_dereference(n->ht_down); 1309 if (ht_down && 1310 nla_put_u32(skb, TCA_U32_LINK, ht_down->handle)) 1311 goto nla_put_failure; 1312 1313 if (n->flags && nla_put_u32(skb, TCA_U32_FLAGS, n->flags)) 1314 goto nla_put_failure; 1315 1316 #ifdef CONFIG_CLS_U32_MARK 1317 if ((n->val || n->mask)) { 1318 struct tc_u32_mark mark = {.val = n->val, 1319 .mask = n->mask, 1320 .success = 0}; 1321 int cpum; 1322 1323 for_each_possible_cpu(cpum) { 1324 __u32 cnt = *per_cpu_ptr(n->pcpu_success, cpum); 1325 1326 mark.success += cnt; 1327 } 1328 1329 if (nla_put(skb, TCA_U32_MARK, sizeof(mark), &mark)) 1330 goto nla_put_failure; 1331 } 1332 #endif 1333 1334 if (tcf_exts_dump(skb, &n->exts) < 0) 1335 goto nla_put_failure; 1336 1337 if (n->ifindex) { 1338 struct net_device *dev; 1339 dev = __dev_get_by_index(net, n->ifindex); 1340 if (dev && nla_put_string(skb, TCA_U32_INDEV, dev->name)) 1341 goto nla_put_failure; 1342 } 1343 #ifdef CONFIG_CLS_U32_PERF 1344 gpf = kzalloc(struct_size(gpf, kcnts, n->sel.nkeys), GFP_KERNEL); 1345 if (!gpf) 1346 goto nla_put_failure; 1347 1348 for_each_possible_cpu(cpu) { 1349 int i; 1350 struct tc_u32_pcnt *pf = per_cpu_ptr(n->pf, cpu); 1351 1352 gpf->rcnt += pf->rcnt; 1353 gpf->rhit += pf->rhit; 1354 for (i = 0; i < n->sel.nkeys; i++) 1355 gpf->kcnts[i] += pf->kcnts[i]; 1356 } 1357 1358 if (nla_put_64bit(skb, TCA_U32_PCNT, struct_size(gpf, kcnts, n->sel.nkeys), 1359 gpf, TCA_U32_PAD)) { 1360 kfree(gpf); 1361 goto nla_put_failure; 1362 } 1363 kfree(gpf); 1364 #endif 1365 } 1366 1367 nla_nest_end(skb, nest); 1368 1369 if (TC_U32_KEY(n->handle)) 1370 if (tcf_exts_dump_stats(skb, &n->exts) < 0) 1371 goto nla_put_failure; 1372 return skb->len; 1373 1374 nla_put_failure: 1375 nla_nest_cancel(skb, nest); 1376 return -1; 1377 } 1378 1379 static struct tcf_proto_ops cls_u32_ops __read_mostly = { 1380 .kind = "u32", 1381 .classify = u32_classify, 1382 .init = u32_init, 1383 .destroy = u32_destroy, 1384 .get = u32_get, 1385 .change = u32_change, 1386 .delete = u32_delete, 1387 .walk = u32_walk, 1388 .reoffload = u32_reoffload, 1389 .dump = u32_dump, 1390 .bind_class = u32_bind_class, 1391 .owner = THIS_MODULE, 1392 }; 1393 1394 static int __init init_u32(void) 1395 { 1396 int i, ret; 1397 1398 pr_info("u32 classifier\n"); 1399 #ifdef CONFIG_CLS_U32_PERF 1400 pr_info(" Performance counters on\n"); 1401 #endif 1402 pr_info(" input device check on\n"); 1403 #ifdef CONFIG_NET_CLS_ACT 1404 pr_info(" Actions configured\n"); 1405 #endif 1406 tc_u_common_hash = kvmalloc_array(U32_HASH_SIZE, 1407 sizeof(struct hlist_head), 1408 GFP_KERNEL); 1409 if (!tc_u_common_hash) 1410 return -ENOMEM; 1411 1412 for (i = 0; i < U32_HASH_SIZE; i++) 1413 INIT_HLIST_HEAD(&tc_u_common_hash[i]); 1414 1415 ret = register_tcf_proto_ops(&cls_u32_ops); 1416 if (ret) 1417 kvfree(tc_u_common_hash); 1418 return ret; 1419 } 1420 1421 static void __exit exit_u32(void) 1422 { 1423 unregister_tcf_proto_ops(&cls_u32_ops); 1424 kvfree(tc_u_common_hash); 1425 } 1426 1427 module_init(init_u32) 1428 module_exit(exit_u32) 1429 MODULE_LICENSE("GPL"); 1430