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