1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Berkeley Packet Filter based traffic classifier 4 * 5 * Might be used to classify traffic through flexible, user-defined and 6 * possibly JIT-ed BPF filters for traffic control as an alternative to 7 * ematches. 8 * 9 * (C) 2013 Daniel Borkmann <dborkman@redhat.com> 10 */ 11 12 #include <linux/module.h> 13 #include <linux/types.h> 14 #include <linux/skbuff.h> 15 #include <linux/filter.h> 16 #include <linux/bpf.h> 17 #include <linux/idr.h> 18 19 #include <net/rtnetlink.h> 20 #include <net/pkt_cls.h> 21 #include <net/sock.h> 22 23 MODULE_LICENSE("GPL"); 24 MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); 25 MODULE_DESCRIPTION("TC BPF based classifier"); 26 27 #define CLS_BPF_NAME_LEN 256 28 #define CLS_BPF_SUPPORTED_GEN_FLAGS \ 29 (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) 30 31 struct cls_bpf_head { 32 struct list_head plist; 33 struct idr handle_idr; 34 struct rcu_head rcu; 35 }; 36 37 struct cls_bpf_prog { 38 struct bpf_prog *filter; 39 struct list_head link; 40 struct tcf_result res; 41 bool exts_integrated; 42 u32 gen_flags; 43 unsigned int in_hw_count; 44 struct tcf_exts exts; 45 u32 handle; 46 u16 bpf_num_ops; 47 struct sock_filter *bpf_ops; 48 const char *bpf_name; 49 struct tcf_proto *tp; 50 struct rcu_work rwork; 51 }; 52 53 static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { 54 [TCA_BPF_CLASSID] = { .type = NLA_U32 }, 55 [TCA_BPF_FLAGS] = { .type = NLA_U32 }, 56 [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, 57 [TCA_BPF_FD] = { .type = NLA_U32 }, 58 [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, 59 .len = CLS_BPF_NAME_LEN }, 60 [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, 61 [TCA_BPF_OPS] = { .type = NLA_BINARY, 62 .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, 63 }; 64 65 static int cls_bpf_exec_opcode(int code) 66 { 67 switch (code) { 68 case TC_ACT_OK: 69 case TC_ACT_SHOT: 70 case TC_ACT_STOLEN: 71 case TC_ACT_TRAP: 72 case TC_ACT_REDIRECT: 73 case TC_ACT_UNSPEC: 74 return code; 75 default: 76 return TC_ACT_UNSPEC; 77 } 78 } 79 80 static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, 81 struct tcf_result *res) 82 { 83 struct cls_bpf_head *head = rcu_dereference_bh(tp->root); 84 bool at_ingress = skb_at_tc_ingress(skb); 85 struct cls_bpf_prog *prog; 86 int ret = -1; 87 88 /* Needed here for accessing maps. */ 89 rcu_read_lock(); 90 list_for_each_entry_rcu(prog, &head->plist, link) { 91 int filter_res; 92 93 qdisc_skb_cb(skb)->tc_classid = prog->res.classid; 94 95 if (tc_skip_sw(prog->gen_flags)) { 96 filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; 97 } else if (at_ingress) { 98 /* It is safe to push/pull even if skb_shared() */ 99 __skb_push(skb, skb->mac_len); 100 bpf_compute_data_pointers(skb); 101 filter_res = BPF_PROG_RUN(prog->filter, skb); 102 __skb_pull(skb, skb->mac_len); 103 } else { 104 bpf_compute_data_pointers(skb); 105 filter_res = BPF_PROG_RUN(prog->filter, skb); 106 } 107 108 if (prog->exts_integrated) { 109 res->class = 0; 110 res->classid = TC_H_MAJ(prog->res.classid) | 111 qdisc_skb_cb(skb)->tc_classid; 112 113 ret = cls_bpf_exec_opcode(filter_res); 114 if (ret == TC_ACT_UNSPEC) 115 continue; 116 break; 117 } 118 119 if (filter_res == 0) 120 continue; 121 if (filter_res != -1) { 122 res->class = 0; 123 res->classid = filter_res; 124 } else { 125 *res = prog->res; 126 } 127 128 ret = tcf_exts_exec(skb, &prog->exts, res); 129 if (ret < 0) 130 continue; 131 132 break; 133 } 134 rcu_read_unlock(); 135 136 return ret; 137 } 138 139 static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) 140 { 141 return !prog->bpf_ops; 142 } 143 144 static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, 145 struct cls_bpf_prog *oldprog, 146 struct netlink_ext_ack *extack) 147 { 148 struct tcf_block *block = tp->chain->block; 149 struct tc_cls_bpf_offload cls_bpf = {}; 150 struct cls_bpf_prog *obj; 151 bool skip_sw; 152 int err; 153 154 skip_sw = prog && tc_skip_sw(prog->gen_flags); 155 obj = prog ?: oldprog; 156 157 tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, extack); 158 cls_bpf.command = TC_CLSBPF_OFFLOAD; 159 cls_bpf.exts = &obj->exts; 160 cls_bpf.prog = prog ? prog->filter : NULL; 161 cls_bpf.oldprog = oldprog ? oldprog->filter : NULL; 162 cls_bpf.name = obj->bpf_name; 163 cls_bpf.exts_integrated = obj->exts_integrated; 164 165 if (oldprog) 166 tcf_block_offload_dec(block, &oldprog->gen_flags); 167 168 err = tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); 169 if (prog) { 170 if (err < 0) { 171 cls_bpf_offload_cmd(tp, oldprog, prog, extack); 172 return err; 173 } else if (err > 0) { 174 prog->in_hw_count = err; 175 tcf_block_offload_inc(block, &prog->gen_flags); 176 } 177 } 178 179 if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) 180 return -EINVAL; 181 182 return 0; 183 } 184 185 static u32 cls_bpf_flags(u32 flags) 186 { 187 return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; 188 } 189 190 static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, 191 struct cls_bpf_prog *oldprog, 192 struct netlink_ext_ack *extack) 193 { 194 if (prog && oldprog && 195 cls_bpf_flags(prog->gen_flags) != 196 cls_bpf_flags(oldprog->gen_flags)) 197 return -EINVAL; 198 199 if (prog && tc_skip_hw(prog->gen_flags)) 200 prog = NULL; 201 if (oldprog && tc_skip_hw(oldprog->gen_flags)) 202 oldprog = NULL; 203 if (!prog && !oldprog) 204 return 0; 205 206 return cls_bpf_offload_cmd(tp, prog, oldprog, extack); 207 } 208 209 static void cls_bpf_stop_offload(struct tcf_proto *tp, 210 struct cls_bpf_prog *prog, 211 struct netlink_ext_ack *extack) 212 { 213 int err; 214 215 err = cls_bpf_offload_cmd(tp, NULL, prog, extack); 216 if (err) 217 pr_err("Stopping hardware offload failed: %d\n", err); 218 } 219 220 static void cls_bpf_offload_update_stats(struct tcf_proto *tp, 221 struct cls_bpf_prog *prog) 222 { 223 struct tcf_block *block = tp->chain->block; 224 struct tc_cls_bpf_offload cls_bpf = {}; 225 226 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL); 227 cls_bpf.command = TC_CLSBPF_STATS; 228 cls_bpf.exts = &prog->exts; 229 cls_bpf.prog = prog->filter; 230 cls_bpf.name = prog->bpf_name; 231 cls_bpf.exts_integrated = prog->exts_integrated; 232 233 tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false); 234 } 235 236 static int cls_bpf_init(struct tcf_proto *tp) 237 { 238 struct cls_bpf_head *head; 239 240 head = kzalloc(sizeof(*head), GFP_KERNEL); 241 if (head == NULL) 242 return -ENOBUFS; 243 244 INIT_LIST_HEAD_RCU(&head->plist); 245 idr_init(&head->handle_idr); 246 rcu_assign_pointer(tp->root, head); 247 248 return 0; 249 } 250 251 static void cls_bpf_free_parms(struct cls_bpf_prog *prog) 252 { 253 if (cls_bpf_is_ebpf(prog)) 254 bpf_prog_put(prog->filter); 255 else 256 bpf_prog_destroy(prog->filter); 257 258 kfree(prog->bpf_name); 259 kfree(prog->bpf_ops); 260 } 261 262 static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) 263 { 264 tcf_exts_destroy(&prog->exts); 265 tcf_exts_put_net(&prog->exts); 266 267 cls_bpf_free_parms(prog); 268 kfree(prog); 269 } 270 271 static void cls_bpf_delete_prog_work(struct work_struct *work) 272 { 273 struct cls_bpf_prog *prog = container_of(to_rcu_work(work), 274 struct cls_bpf_prog, 275 rwork); 276 rtnl_lock(); 277 __cls_bpf_delete_prog(prog); 278 rtnl_unlock(); 279 } 280 281 static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, 282 struct netlink_ext_ack *extack) 283 { 284 struct cls_bpf_head *head = rtnl_dereference(tp->root); 285 286 idr_remove(&head->handle_idr, prog->handle); 287 cls_bpf_stop_offload(tp, prog, extack); 288 list_del_rcu(&prog->link); 289 tcf_unbind_filter(tp, &prog->res); 290 if (tcf_exts_get_net(&prog->exts)) 291 tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); 292 else 293 __cls_bpf_delete_prog(prog); 294 } 295 296 static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, 297 bool rtnl_held, struct netlink_ext_ack *extack) 298 { 299 struct cls_bpf_head *head = rtnl_dereference(tp->root); 300 301 __cls_bpf_delete(tp, arg, extack); 302 *last = list_empty(&head->plist); 303 return 0; 304 } 305 306 static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held, 307 struct netlink_ext_ack *extack) 308 { 309 struct cls_bpf_head *head = rtnl_dereference(tp->root); 310 struct cls_bpf_prog *prog, *tmp; 311 312 list_for_each_entry_safe(prog, tmp, &head->plist, link) 313 __cls_bpf_delete(tp, prog, extack); 314 315 idr_destroy(&head->handle_idr); 316 kfree_rcu(head, rcu); 317 } 318 319 static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) 320 { 321 struct cls_bpf_head *head = rtnl_dereference(tp->root); 322 struct cls_bpf_prog *prog; 323 324 list_for_each_entry(prog, &head->plist, link) { 325 if (prog->handle == handle) 326 return prog; 327 } 328 329 return NULL; 330 } 331 332 static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) 333 { 334 struct sock_filter *bpf_ops; 335 struct sock_fprog_kern fprog_tmp; 336 struct bpf_prog *fp; 337 u16 bpf_size, bpf_num_ops; 338 int ret; 339 340 bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); 341 if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) 342 return -EINVAL; 343 344 bpf_size = bpf_num_ops * sizeof(*bpf_ops); 345 if (bpf_size != nla_len(tb[TCA_BPF_OPS])) 346 return -EINVAL; 347 348 bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL); 349 if (bpf_ops == NULL) 350 return -ENOMEM; 351 352 fprog_tmp.len = bpf_num_ops; 353 fprog_tmp.filter = bpf_ops; 354 355 ret = bpf_prog_create(&fp, &fprog_tmp); 356 if (ret < 0) { 357 kfree(bpf_ops); 358 return ret; 359 } 360 361 prog->bpf_ops = bpf_ops; 362 prog->bpf_num_ops = bpf_num_ops; 363 prog->bpf_name = NULL; 364 prog->filter = fp; 365 366 return 0; 367 } 368 369 static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, 370 u32 gen_flags, const struct tcf_proto *tp) 371 { 372 struct bpf_prog *fp; 373 char *name = NULL; 374 bool skip_sw; 375 u32 bpf_fd; 376 377 bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); 378 skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; 379 380 fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); 381 if (IS_ERR(fp)) 382 return PTR_ERR(fp); 383 384 if (tb[TCA_BPF_NAME]) { 385 name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); 386 if (!name) { 387 bpf_prog_put(fp); 388 return -ENOMEM; 389 } 390 } 391 392 prog->bpf_ops = NULL; 393 prog->bpf_name = name; 394 prog->filter = fp; 395 396 if (fp->dst_needed) 397 tcf_block_netif_keep_dst(tp->chain->block); 398 399 return 0; 400 } 401 402 static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, 403 struct cls_bpf_prog *prog, unsigned long base, 404 struct nlattr **tb, struct nlattr *est, bool ovr, 405 struct netlink_ext_ack *extack) 406 { 407 bool is_bpf, is_ebpf, have_exts = false; 408 u32 gen_flags = 0; 409 int ret; 410 411 is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; 412 is_ebpf = tb[TCA_BPF_FD]; 413 if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) 414 return -EINVAL; 415 416 ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, true, 417 extack); 418 if (ret < 0) 419 return ret; 420 421 if (tb[TCA_BPF_FLAGS]) { 422 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); 423 424 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) 425 return -EINVAL; 426 427 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; 428 } 429 if (tb[TCA_BPF_FLAGS_GEN]) { 430 gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); 431 if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || 432 !tc_flags_valid(gen_flags)) 433 return -EINVAL; 434 } 435 436 prog->exts_integrated = have_exts; 437 prog->gen_flags = gen_flags; 438 439 ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : 440 cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); 441 if (ret < 0) 442 return ret; 443 444 if (tb[TCA_BPF_CLASSID]) { 445 prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); 446 tcf_bind_filter(tp, &prog->res, base); 447 } 448 449 return 0; 450 } 451 452 static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, 453 struct tcf_proto *tp, unsigned long base, 454 u32 handle, struct nlattr **tca, 455 void **arg, bool ovr, bool rtnl_held, 456 struct netlink_ext_ack *extack) 457 { 458 struct cls_bpf_head *head = rtnl_dereference(tp->root); 459 struct cls_bpf_prog *oldprog = *arg; 460 struct nlattr *tb[TCA_BPF_MAX + 1]; 461 struct cls_bpf_prog *prog; 462 int ret; 463 464 if (tca[TCA_OPTIONS] == NULL) 465 return -EINVAL; 466 467 ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], 468 bpf_policy, NULL); 469 if (ret < 0) 470 return ret; 471 472 prog = kzalloc(sizeof(*prog), GFP_KERNEL); 473 if (!prog) 474 return -ENOBUFS; 475 476 ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE); 477 if (ret < 0) 478 goto errout; 479 480 if (oldprog) { 481 if (handle && oldprog->handle != handle) { 482 ret = -EINVAL; 483 goto errout; 484 } 485 } 486 487 if (handle == 0) { 488 handle = 1; 489 ret = idr_alloc_u32(&head->handle_idr, prog, &handle, 490 INT_MAX, GFP_KERNEL); 491 } else if (!oldprog) { 492 ret = idr_alloc_u32(&head->handle_idr, prog, &handle, 493 handle, GFP_KERNEL); 494 } 495 496 if (ret) 497 goto errout; 498 prog->handle = handle; 499 500 ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr, 501 extack); 502 if (ret < 0) 503 goto errout_idr; 504 505 ret = cls_bpf_offload(tp, prog, oldprog, extack); 506 if (ret) 507 goto errout_parms; 508 509 if (!tc_in_hw(prog->gen_flags)) 510 prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; 511 512 if (oldprog) { 513 idr_replace(&head->handle_idr, prog, handle); 514 list_replace_rcu(&oldprog->link, &prog->link); 515 tcf_unbind_filter(tp, &oldprog->res); 516 tcf_exts_get_net(&oldprog->exts); 517 tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); 518 } else { 519 list_add_rcu(&prog->link, &head->plist); 520 } 521 522 *arg = prog; 523 return 0; 524 525 errout_parms: 526 cls_bpf_free_parms(prog); 527 errout_idr: 528 if (!oldprog) 529 idr_remove(&head->handle_idr, prog->handle); 530 errout: 531 tcf_exts_destroy(&prog->exts); 532 kfree(prog); 533 return ret; 534 } 535 536 static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, 537 struct sk_buff *skb) 538 { 539 struct nlattr *nla; 540 541 if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) 542 return -EMSGSIZE; 543 544 nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * 545 sizeof(struct sock_filter)); 546 if (nla == NULL) 547 return -EMSGSIZE; 548 549 memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); 550 551 return 0; 552 } 553 554 static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, 555 struct sk_buff *skb) 556 { 557 struct nlattr *nla; 558 559 if (prog->bpf_name && 560 nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) 561 return -EMSGSIZE; 562 563 if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) 564 return -EMSGSIZE; 565 566 nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); 567 if (nla == NULL) 568 return -EMSGSIZE; 569 570 memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); 571 572 return 0; 573 } 574 575 static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, 576 struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held) 577 { 578 struct cls_bpf_prog *prog = fh; 579 struct nlattr *nest; 580 u32 bpf_flags = 0; 581 int ret; 582 583 if (prog == NULL) 584 return skb->len; 585 586 tm->tcm_handle = prog->handle; 587 588 cls_bpf_offload_update_stats(tp, prog); 589 590 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 591 if (nest == NULL) 592 goto nla_put_failure; 593 594 if (prog->res.classid && 595 nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) 596 goto nla_put_failure; 597 598 if (cls_bpf_is_ebpf(prog)) 599 ret = cls_bpf_dump_ebpf_info(prog, skb); 600 else 601 ret = cls_bpf_dump_bpf_info(prog, skb); 602 if (ret) 603 goto nla_put_failure; 604 605 if (tcf_exts_dump(skb, &prog->exts) < 0) 606 goto nla_put_failure; 607 608 if (prog->exts_integrated) 609 bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; 610 if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) 611 goto nla_put_failure; 612 if (prog->gen_flags && 613 nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) 614 goto nla_put_failure; 615 616 nla_nest_end(skb, nest); 617 618 if (tcf_exts_dump_stats(skb, &prog->exts) < 0) 619 goto nla_put_failure; 620 621 return skb->len; 622 623 nla_put_failure: 624 nla_nest_cancel(skb, nest); 625 return -1; 626 } 627 628 static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) 629 { 630 struct cls_bpf_prog *prog = fh; 631 632 if (prog && prog->res.classid == classid) 633 prog->res.class = cl; 634 } 635 636 static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg, 637 bool rtnl_held) 638 { 639 struct cls_bpf_head *head = rtnl_dereference(tp->root); 640 struct cls_bpf_prog *prog; 641 642 list_for_each_entry(prog, &head->plist, link) { 643 if (arg->count < arg->skip) 644 goto skip; 645 if (arg->fn(tp, prog, arg) < 0) { 646 arg->stop = 1; 647 break; 648 } 649 skip: 650 arg->count++; 651 } 652 } 653 654 static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, 655 void *cb_priv, struct netlink_ext_ack *extack) 656 { 657 struct cls_bpf_head *head = rtnl_dereference(tp->root); 658 struct tcf_block *block = tp->chain->block; 659 struct tc_cls_bpf_offload cls_bpf = {}; 660 struct cls_bpf_prog *prog; 661 int err; 662 663 list_for_each_entry(prog, &head->plist, link) { 664 if (tc_skip_hw(prog->gen_flags)) 665 continue; 666 667 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, 668 extack); 669 cls_bpf.command = TC_CLSBPF_OFFLOAD; 670 cls_bpf.exts = &prog->exts; 671 cls_bpf.prog = add ? prog->filter : NULL; 672 cls_bpf.oldprog = add ? NULL : prog->filter; 673 cls_bpf.name = prog->bpf_name; 674 cls_bpf.exts_integrated = prog->exts_integrated; 675 676 err = cb(TC_SETUP_CLSBPF, &cls_bpf, cb_priv); 677 if (err) { 678 if (add && tc_skip_sw(prog->gen_flags)) 679 return err; 680 continue; 681 } 682 683 tc_cls_offload_cnt_update(block, &prog->in_hw_count, 684 &prog->gen_flags, add); 685 } 686 687 return 0; 688 } 689 690 static struct tcf_proto_ops cls_bpf_ops __read_mostly = { 691 .kind = "bpf", 692 .owner = THIS_MODULE, 693 .classify = cls_bpf_classify, 694 .init = cls_bpf_init, 695 .destroy = cls_bpf_destroy, 696 .get = cls_bpf_get, 697 .change = cls_bpf_change, 698 .delete = cls_bpf_delete, 699 .walk = cls_bpf_walk, 700 .reoffload = cls_bpf_reoffload, 701 .dump = cls_bpf_dump, 702 .bind_class = cls_bpf_bind_class, 703 }; 704 705 static int __init cls_bpf_init_mod(void) 706 { 707 return register_tcf_proto_ops(&cls_bpf_ops); 708 } 709 710 static void __exit cls_bpf_exit_mod(void) 711 { 712 unregister_tcf_proto_ops(&cls_bpf_ops); 713 } 714 715 module_init(cls_bpf_init_mod); 716 module_exit(cls_bpf_exit_mod); 717