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 #include <net/tc_wrapper.h> 23 24 MODULE_LICENSE("GPL"); 25 MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); 26 MODULE_DESCRIPTION("TC BPF based classifier"); 27 28 #define CLS_BPF_NAME_LEN 256 29 #define CLS_BPF_SUPPORTED_GEN_FLAGS \ 30 (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) 31 32 struct cls_bpf_head { 33 struct list_head plist; 34 struct idr handle_idr; 35 struct rcu_head rcu; 36 }; 37 38 struct cls_bpf_prog { 39 struct bpf_prog *filter; 40 struct list_head link; 41 struct tcf_result res; 42 bool exts_integrated; 43 u32 gen_flags; 44 unsigned int in_hw_count; 45 struct tcf_exts exts; 46 u32 handle; 47 u16 bpf_num_ops; 48 struct sock_filter *bpf_ops; 49 const char *bpf_name; 50 struct tcf_proto *tp; 51 struct rcu_work rwork; 52 }; 53 54 static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { 55 [TCA_BPF_CLASSID] = { .type = NLA_U32 }, 56 [TCA_BPF_FLAGS] = { .type = NLA_U32 }, 57 [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, 58 [TCA_BPF_FD] = { .type = NLA_U32 }, 59 [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, 60 .len = CLS_BPF_NAME_LEN }, 61 [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, 62 [TCA_BPF_OPS] = { .type = NLA_BINARY, 63 .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, 64 }; 65 66 static int cls_bpf_exec_opcode(int code) 67 { 68 switch (code) { 69 case TC_ACT_OK: 70 case TC_ACT_SHOT: 71 case TC_ACT_STOLEN: 72 case TC_ACT_TRAP: 73 case TC_ACT_REDIRECT: 74 case TC_ACT_UNSPEC: 75 return code; 76 default: 77 return TC_ACT_UNSPEC; 78 } 79 } 80 81 TC_INDIRECT_SCOPE int cls_bpf_classify(struct sk_buff *skb, 82 const struct tcf_proto *tp, 83 struct tcf_result *res) 84 { 85 struct cls_bpf_head *head = rcu_dereference_bh(tp->root); 86 bool at_ingress = skb_at_tc_ingress(skb); 87 struct cls_bpf_prog *prog; 88 int ret = -1; 89 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 filter_res = bpf_prog_run_data_pointers(prog->filter, skb); 101 __skb_pull(skb, skb->mac_len); 102 } else { 103 filter_res = bpf_prog_run_data_pointers(prog->filter, skb); 104 } 105 if (unlikely(!skb->tstamp && skb->tstamp_type)) 106 skb->tstamp_type = SKB_CLOCK_REALTIME; 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 } 134 135 return ret; 136 } 137 138 static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) 139 { 140 return !prog->bpf_ops; 141 } 142 143 static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, 144 struct cls_bpf_prog *oldprog, 145 struct netlink_ext_ack *extack, 146 bool is_rollback) 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 && prog) 166 err = tc_setup_cb_replace(block, tp, TC_SETUP_CLSBPF, &cls_bpf, 167 skip_sw, &oldprog->gen_flags, 168 &oldprog->in_hw_count, 169 &prog->gen_flags, &prog->in_hw_count, 170 true); 171 else if (prog) 172 err = tc_setup_cb_add(block, tp, TC_SETUP_CLSBPF, &cls_bpf, 173 skip_sw, &prog->gen_flags, 174 &prog->in_hw_count, true); 175 else 176 err = tc_setup_cb_destroy(block, tp, TC_SETUP_CLSBPF, &cls_bpf, 177 skip_sw, &oldprog->gen_flags, 178 &oldprog->in_hw_count, true); 179 180 if (prog && err) { 181 if (!is_rollback) 182 cls_bpf_offload_cmd(tp, oldprog, prog, extack, true); 183 return err; 184 } 185 186 if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) 187 return -EINVAL; 188 189 return 0; 190 } 191 192 static u32 cls_bpf_flags(u32 flags) 193 { 194 return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; 195 } 196 197 static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, 198 struct cls_bpf_prog *oldprog, 199 struct netlink_ext_ack *extack) 200 { 201 if (prog && oldprog && 202 cls_bpf_flags(prog->gen_flags) != 203 cls_bpf_flags(oldprog->gen_flags)) 204 return -EINVAL; 205 206 if (prog && tc_skip_hw(prog->gen_flags)) 207 prog = NULL; 208 if (oldprog && tc_skip_hw(oldprog->gen_flags)) 209 oldprog = NULL; 210 if (!prog && !oldprog) 211 return 0; 212 213 return cls_bpf_offload_cmd(tp, prog, oldprog, extack, false); 214 } 215 216 static void cls_bpf_stop_offload(struct tcf_proto *tp, 217 struct cls_bpf_prog *prog, 218 struct netlink_ext_ack *extack) 219 { 220 int err; 221 222 err = cls_bpf_offload_cmd(tp, NULL, prog, extack, false); 223 if (err) 224 pr_err("Stopping hardware offload failed: %d\n", err); 225 } 226 227 static void cls_bpf_offload_update_stats(struct tcf_proto *tp, 228 struct cls_bpf_prog *prog) 229 { 230 struct tcf_block *block = tp->chain->block; 231 struct tc_cls_bpf_offload cls_bpf = {}; 232 233 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL); 234 cls_bpf.command = TC_CLSBPF_STATS; 235 cls_bpf.exts = &prog->exts; 236 cls_bpf.prog = prog->filter; 237 cls_bpf.name = prog->bpf_name; 238 cls_bpf.exts_integrated = prog->exts_integrated; 239 240 tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false, true); 241 } 242 243 static int cls_bpf_init(struct tcf_proto *tp) 244 { 245 struct cls_bpf_head *head; 246 247 head = kzalloc_obj(*head); 248 if (head == NULL) 249 return -ENOBUFS; 250 251 INIT_LIST_HEAD_RCU(&head->plist); 252 idr_init(&head->handle_idr); 253 rcu_assign_pointer(tp->root, head); 254 255 return 0; 256 } 257 258 static void cls_bpf_free_parms(struct cls_bpf_prog *prog) 259 { 260 if (cls_bpf_is_ebpf(prog)) 261 bpf_prog_put(prog->filter); 262 else 263 bpf_prog_destroy(prog->filter); 264 265 kfree(prog->bpf_name); 266 kfree(prog->bpf_ops); 267 } 268 269 static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) 270 { 271 tcf_exts_destroy(&prog->exts); 272 tcf_exts_put_net(&prog->exts); 273 274 cls_bpf_free_parms(prog); 275 kfree(prog); 276 } 277 278 static void cls_bpf_delete_prog_work(struct work_struct *work) 279 { 280 struct cls_bpf_prog *prog = container_of(to_rcu_work(work), 281 struct cls_bpf_prog, 282 rwork); 283 rtnl_lock(); 284 __cls_bpf_delete_prog(prog); 285 rtnl_unlock(); 286 } 287 288 static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, 289 struct netlink_ext_ack *extack) 290 { 291 struct cls_bpf_head *head = rtnl_dereference(tp->root); 292 293 idr_remove(&head->handle_idr, prog->handle); 294 cls_bpf_stop_offload(tp, prog, extack); 295 list_del_rcu(&prog->link); 296 tcf_unbind_filter(tp, &prog->res); 297 if (tcf_exts_get_net(&prog->exts)) 298 tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); 299 else 300 __cls_bpf_delete_prog(prog); 301 } 302 303 static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, 304 bool rtnl_held, struct netlink_ext_ack *extack) 305 { 306 struct cls_bpf_head *head = rtnl_dereference(tp->root); 307 308 __cls_bpf_delete(tp, arg, extack); 309 *last = list_empty(&head->plist); 310 return 0; 311 } 312 313 static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held, 314 struct netlink_ext_ack *extack) 315 { 316 struct cls_bpf_head *head = rtnl_dereference(tp->root); 317 struct cls_bpf_prog *prog, *tmp; 318 319 list_for_each_entry_safe(prog, tmp, &head->plist, link) 320 __cls_bpf_delete(tp, prog, extack); 321 322 idr_destroy(&head->handle_idr); 323 kfree_rcu(head, rcu); 324 } 325 326 static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) 327 { 328 struct cls_bpf_head *head = rtnl_dereference(tp->root); 329 struct cls_bpf_prog *prog; 330 331 list_for_each_entry(prog, &head->plist, link) { 332 if (prog->handle == handle) 333 return prog; 334 } 335 336 return NULL; 337 } 338 339 static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) 340 { 341 struct sock_filter *bpf_ops; 342 struct sock_fprog_kern fprog_tmp; 343 struct bpf_prog *fp; 344 u16 bpf_size, bpf_num_ops; 345 int ret; 346 347 bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); 348 if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) 349 return -EINVAL; 350 351 bpf_size = bpf_num_ops * sizeof(*bpf_ops); 352 if (bpf_size != nla_len(tb[TCA_BPF_OPS])) 353 return -EINVAL; 354 355 bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL); 356 if (bpf_ops == NULL) 357 return -ENOMEM; 358 359 fprog_tmp.len = bpf_num_ops; 360 fprog_tmp.filter = bpf_ops; 361 362 ret = bpf_prog_create(&fp, &fprog_tmp); 363 if (ret < 0) { 364 kfree(bpf_ops); 365 return ret; 366 } 367 368 prog->bpf_ops = bpf_ops; 369 prog->bpf_num_ops = bpf_num_ops; 370 prog->bpf_name = NULL; 371 prog->filter = fp; 372 373 return 0; 374 } 375 376 static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, 377 u32 gen_flags, const struct tcf_proto *tp, 378 struct netlink_ext_ack *extack) 379 { 380 struct bpf_prog *fp; 381 char *name = NULL; 382 bool skip_sw; 383 u32 bpf_fd; 384 385 bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); 386 skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; 387 388 fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); 389 if (IS_ERR(fp)) 390 return PTR_ERR(fp); 391 392 if (bpf_prog_is_dev_bound(fp->aux)) { 393 struct tcf_block *block = tp->chain->block; 394 struct net_device *dev; 395 396 dev = block->q ? qdisc_dev(block->q) : NULL; 397 if (!dev || !bpf_offload_dev_match(fp, dev)) { 398 NL_SET_ERR_MSG(extack, 399 "Program is bound to a different device"); 400 bpf_prog_put(fp); 401 return -EINVAL; 402 } 403 } 404 405 if (tb[TCA_BPF_NAME]) { 406 name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); 407 if (!name) { 408 bpf_prog_put(fp); 409 return -ENOMEM; 410 } 411 } 412 413 prog->bpf_ops = NULL; 414 prog->bpf_name = name; 415 prog->filter = fp; 416 417 if (fp->dst_needed) 418 tcf_block_netif_keep_dst(tp->chain->block); 419 420 return 0; 421 } 422 423 static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, 424 struct tcf_proto *tp, unsigned long base, 425 u32 handle, struct nlattr **tca, 426 void **arg, u32 flags, 427 struct netlink_ext_ack *extack) 428 { 429 struct cls_bpf_head *head = rtnl_dereference(tp->root); 430 bool is_bpf, is_ebpf, have_exts = false; 431 struct cls_bpf_prog *oldprog = *arg; 432 struct nlattr *tb[TCA_BPF_MAX + 1]; 433 bool bound_to_filter = false; 434 struct cls_bpf_prog *prog; 435 u32 gen_flags = 0; 436 int ret; 437 438 if (tca[TCA_OPTIONS] == NULL) 439 return -EINVAL; 440 441 ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], 442 bpf_policy, NULL); 443 if (ret < 0) 444 return ret; 445 446 prog = kzalloc_obj(*prog); 447 if (!prog) 448 return -ENOBUFS; 449 450 ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE); 451 if (ret < 0) 452 goto errout; 453 454 if (oldprog) { 455 if (handle && oldprog->handle != handle) { 456 ret = -EINVAL; 457 goto errout; 458 } 459 } 460 461 if (handle == 0) { 462 handle = 1; 463 ret = idr_alloc_u32(&head->handle_idr, prog, &handle, 464 INT_MAX, GFP_KERNEL); 465 } else if (!oldprog) { 466 ret = idr_alloc_u32(&head->handle_idr, prog, &handle, 467 handle, GFP_KERNEL); 468 } 469 470 if (ret) 471 goto errout; 472 prog->handle = handle; 473 474 is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; 475 is_ebpf = tb[TCA_BPF_FD]; 476 if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) { 477 ret = -EINVAL; 478 goto errout_idr; 479 } 480 481 ret = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &prog->exts, 482 flags, extack); 483 if (ret < 0) 484 goto errout_idr; 485 486 if (tb[TCA_BPF_FLAGS]) { 487 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); 488 489 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) { 490 ret = -EINVAL; 491 goto errout_idr; 492 } 493 494 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; 495 } 496 if (tb[TCA_BPF_FLAGS_GEN]) { 497 gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); 498 if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || 499 !tc_flags_valid(gen_flags)) { 500 ret = -EINVAL; 501 goto errout_idr; 502 } 503 } 504 505 prog->exts_integrated = have_exts; 506 prog->gen_flags = gen_flags; 507 508 ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : 509 cls_bpf_prog_from_efd(tb, prog, gen_flags, tp, extack); 510 if (ret < 0) 511 goto errout_idr; 512 513 if (tb[TCA_BPF_CLASSID]) { 514 prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); 515 tcf_bind_filter(tp, &prog->res, base); 516 bound_to_filter = true; 517 } 518 519 ret = cls_bpf_offload(tp, prog, oldprog, extack); 520 if (ret) 521 goto errout_parms; 522 523 if (!tc_in_hw(prog->gen_flags)) 524 prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; 525 526 tcf_proto_update_usesw(tp, prog->gen_flags); 527 528 if (oldprog) { 529 idr_replace(&head->handle_idr, prog, handle); 530 list_replace_rcu(&oldprog->link, &prog->link); 531 tcf_unbind_filter(tp, &oldprog->res); 532 tcf_exts_get_net(&oldprog->exts); 533 tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); 534 } else { 535 list_add_rcu(&prog->link, &head->plist); 536 } 537 538 *arg = prog; 539 return 0; 540 541 errout_parms: 542 if (bound_to_filter) 543 tcf_unbind_filter(tp, &prog->res); 544 cls_bpf_free_parms(prog); 545 errout_idr: 546 if (!oldprog) 547 idr_remove(&head->handle_idr, prog->handle); 548 errout: 549 tcf_exts_destroy(&prog->exts); 550 kfree(prog); 551 return ret; 552 } 553 554 static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, 555 struct sk_buff *skb) 556 { 557 struct nlattr *nla; 558 559 if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) 560 return -EMSGSIZE; 561 562 nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * 563 sizeof(struct sock_filter)); 564 if (nla == NULL) 565 return -EMSGSIZE; 566 567 memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); 568 569 return 0; 570 } 571 572 static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, 573 struct sk_buff *skb) 574 { 575 struct nlattr *nla; 576 577 if (prog->bpf_name && 578 nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) 579 return -EMSGSIZE; 580 581 if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) 582 return -EMSGSIZE; 583 584 nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); 585 if (nla == NULL) 586 return -EMSGSIZE; 587 588 memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); 589 590 return 0; 591 } 592 593 static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, 594 struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held) 595 { 596 struct cls_bpf_prog *prog = fh; 597 struct nlattr *nest; 598 u32 bpf_flags = 0; 599 int ret; 600 601 if (prog == NULL) 602 return skb->len; 603 604 tm->tcm_handle = prog->handle; 605 606 cls_bpf_offload_update_stats(tp, prog); 607 608 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 609 if (nest == NULL) 610 goto nla_put_failure; 611 612 if (prog->res.classid && 613 nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) 614 goto nla_put_failure; 615 616 if (cls_bpf_is_ebpf(prog)) 617 ret = cls_bpf_dump_ebpf_info(prog, skb); 618 else 619 ret = cls_bpf_dump_bpf_info(prog, skb); 620 if (ret) 621 goto nla_put_failure; 622 623 if (tcf_exts_dump(skb, &prog->exts) < 0) 624 goto nla_put_failure; 625 626 if (prog->exts_integrated) 627 bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; 628 if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) 629 goto nla_put_failure; 630 if (prog->gen_flags && 631 nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) 632 goto nla_put_failure; 633 634 nla_nest_end(skb, nest); 635 636 if (tcf_exts_dump_stats(skb, &prog->exts) < 0) 637 goto nla_put_failure; 638 639 return skb->len; 640 641 nla_put_failure: 642 nla_nest_cancel(skb, nest); 643 return -1; 644 } 645 646 static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl, 647 void *q, unsigned long base) 648 { 649 struct cls_bpf_prog *prog = fh; 650 651 tc_cls_bind_class(classid, cl, q, &prog->res, base); 652 } 653 654 static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg, 655 bool rtnl_held) 656 { 657 struct cls_bpf_head *head = rtnl_dereference(tp->root); 658 struct cls_bpf_prog *prog; 659 660 list_for_each_entry(prog, &head->plist, link) { 661 if (!tc_cls_stats_dump(tp, arg, prog)) 662 break; 663 } 664 } 665 666 static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb, 667 void *cb_priv, struct netlink_ext_ack *extack) 668 { 669 struct cls_bpf_head *head = rtnl_dereference(tp->root); 670 struct tcf_block *block = tp->chain->block; 671 struct tc_cls_bpf_offload cls_bpf = {}; 672 struct cls_bpf_prog *prog; 673 int err; 674 675 list_for_each_entry(prog, &head->plist, link) { 676 if (tc_skip_hw(prog->gen_flags)) 677 continue; 678 679 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, 680 extack); 681 cls_bpf.command = TC_CLSBPF_OFFLOAD; 682 cls_bpf.exts = &prog->exts; 683 cls_bpf.prog = add ? prog->filter : NULL; 684 cls_bpf.oldprog = add ? NULL : prog->filter; 685 cls_bpf.name = prog->bpf_name; 686 cls_bpf.exts_integrated = prog->exts_integrated; 687 688 err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSBPF, 689 &cls_bpf, cb_priv, &prog->gen_flags, 690 &prog->in_hw_count); 691 if (err) 692 return err; 693 } 694 695 return 0; 696 } 697 698 static struct tcf_proto_ops cls_bpf_ops __read_mostly = { 699 .kind = "bpf", 700 .owner = THIS_MODULE, 701 .classify = cls_bpf_classify, 702 .init = cls_bpf_init, 703 .destroy = cls_bpf_destroy, 704 .get = cls_bpf_get, 705 .change = cls_bpf_change, 706 .delete = cls_bpf_delete, 707 .walk = cls_bpf_walk, 708 .reoffload = cls_bpf_reoffload, 709 .dump = cls_bpf_dump, 710 .bind_class = cls_bpf_bind_class, 711 }; 712 MODULE_ALIAS_NET_CLS("bpf"); 713 714 static int __init cls_bpf_init_mod(void) 715 { 716 return register_tcf_proto_ops(&cls_bpf_ops); 717 } 718 719 static void __exit cls_bpf_exit_mod(void) 720 { 721 unregister_tcf_proto_ops(&cls_bpf_ops); 722 } 723 724 module_init(cls_bpf_init_mod); 725 module_exit(cls_bpf_exit_mod); 726