1 /* 2 * Berkeley Packet Filter based traffic classifier 3 * 4 * Might be used to classify traffic through flexible, user-defined and 5 * possibly JIT-ed BPF filters for traffic control as an alternative to 6 * ematches. 7 * 8 * (C) 2013 Daniel Borkmann <dborkman@redhat.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License version 2 as 12 * published by the Free Software Foundation. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/types.h> 17 #include <linux/skbuff.h> 18 #include <linux/filter.h> 19 #include <linux/bpf.h> 20 #include <linux/idr.h> 21 22 #include <net/rtnetlink.h> 23 #include <net/pkt_cls.h> 24 #include <net/sock.h> 25 26 MODULE_LICENSE("GPL"); 27 MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); 28 MODULE_DESCRIPTION("TC BPF based classifier"); 29 30 #define CLS_BPF_NAME_LEN 256 31 #define CLS_BPF_SUPPORTED_GEN_FLAGS \ 32 (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) 33 34 struct cls_bpf_head { 35 struct list_head plist; 36 struct idr handle_idr; 37 struct rcu_head rcu; 38 }; 39 40 struct cls_bpf_prog { 41 struct bpf_prog *filter; 42 struct list_head link; 43 struct tcf_result res; 44 bool exts_integrated; 45 u32 gen_flags; 46 unsigned int in_hw_count; 47 struct tcf_exts exts; 48 u32 handle; 49 u16 bpf_num_ops; 50 struct sock_filter *bpf_ops; 51 const char *bpf_name; 52 struct tcf_proto *tp; 53 struct rcu_work rwork; 54 }; 55 56 static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { 57 [TCA_BPF_CLASSID] = { .type = NLA_U32 }, 58 [TCA_BPF_FLAGS] = { .type = NLA_U32 }, 59 [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, 60 [TCA_BPF_FD] = { .type = NLA_U32 }, 61 [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, 62 .len = CLS_BPF_NAME_LEN }, 63 [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, 64 [TCA_BPF_OPS] = { .type = NLA_BINARY, 65 .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, 66 }; 67 68 static int cls_bpf_exec_opcode(int code) 69 { 70 switch (code) { 71 case TC_ACT_OK: 72 case TC_ACT_SHOT: 73 case TC_ACT_STOLEN: 74 case TC_ACT_TRAP: 75 case TC_ACT_REDIRECT: 76 case TC_ACT_UNSPEC: 77 return code; 78 default: 79 return TC_ACT_UNSPEC; 80 } 81 } 82 83 static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, 84 struct tcf_result *res) 85 { 86 struct cls_bpf_head *head = rcu_dereference_bh(tp->root); 87 bool at_ingress = skb_at_tc_ingress(skb); 88 struct cls_bpf_prog *prog; 89 int ret = -1; 90 91 /* Needed here for accessing maps. */ 92 rcu_read_lock(); 93 list_for_each_entry_rcu(prog, &head->plist, link) { 94 int filter_res; 95 96 qdisc_skb_cb(skb)->tc_classid = prog->res.classid; 97 98 if (tc_skip_sw(prog->gen_flags)) { 99 filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; 100 } else if (at_ingress) { 101 /* It is safe to push/pull even if skb_shared() */ 102 __skb_push(skb, skb->mac_len); 103 bpf_compute_data_pointers(skb); 104 filter_res = BPF_PROG_RUN(prog->filter, skb); 105 __skb_pull(skb, skb->mac_len); 106 } else { 107 bpf_compute_data_pointers(skb); 108 filter_res = BPF_PROG_RUN(prog->filter, skb); 109 } 110 111 if (prog->exts_integrated) { 112 res->class = 0; 113 res->classid = TC_H_MAJ(prog->res.classid) | 114 qdisc_skb_cb(skb)->tc_classid; 115 116 ret = cls_bpf_exec_opcode(filter_res); 117 if (ret == TC_ACT_UNSPEC) 118 continue; 119 break; 120 } 121 122 if (filter_res == 0) 123 continue; 124 if (filter_res != -1) { 125 res->class = 0; 126 res->classid = filter_res; 127 } else { 128 *res = prog->res; 129 } 130 131 ret = tcf_exts_exec(skb, &prog->exts, res); 132 if (ret < 0) 133 continue; 134 135 break; 136 } 137 rcu_read_unlock(); 138 139 return ret; 140 } 141 142 static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) 143 { 144 return !prog->bpf_ops; 145 } 146 147 static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, 148 struct cls_bpf_prog *oldprog, 149 struct netlink_ext_ack *extack) 150 { 151 struct tcf_block *block = tp->chain->block; 152 struct tc_cls_bpf_offload cls_bpf = {}; 153 struct cls_bpf_prog *obj; 154 bool skip_sw; 155 int err; 156 157 skip_sw = prog && tc_skip_sw(prog->gen_flags); 158 obj = prog ?: oldprog; 159 160 tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, extack); 161 cls_bpf.command = TC_CLSBPF_OFFLOAD; 162 cls_bpf.exts = &obj->exts; 163 cls_bpf.prog = prog ? prog->filter : NULL; 164 cls_bpf.oldprog = oldprog ? oldprog->filter : NULL; 165 cls_bpf.name = obj->bpf_name; 166 cls_bpf.exts_integrated = obj->exts_integrated; 167 168 if (oldprog) 169 tcf_block_offload_dec(block, &oldprog->gen_flags); 170 171 err = tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); 172 if (prog) { 173 if (err < 0) { 174 cls_bpf_offload_cmd(tp, oldprog, prog, extack); 175 return err; 176 } else if (err > 0) { 177 prog->in_hw_count = err; 178 tcf_block_offload_inc(block, &prog->gen_flags); 179 } 180 } 181 182 if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) 183 return -EINVAL; 184 185 return 0; 186 } 187 188 static u32 cls_bpf_flags(u32 flags) 189 { 190 return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; 191 } 192 193 static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, 194 struct cls_bpf_prog *oldprog, 195 struct netlink_ext_ack *extack) 196 { 197 if (prog && oldprog && 198 cls_bpf_flags(prog->gen_flags) != 199 cls_bpf_flags(oldprog->gen_flags)) 200 return -EINVAL; 201 202 if (prog && tc_skip_hw(prog->gen_flags)) 203 prog = NULL; 204 if (oldprog && tc_skip_hw(oldprog->gen_flags)) 205 oldprog = NULL; 206 if (!prog && !oldprog) 207 return 0; 208 209 return cls_bpf_offload_cmd(tp, prog, oldprog, extack); 210 } 211 212 static void cls_bpf_stop_offload(struct tcf_proto *tp, 213 struct cls_bpf_prog *prog, 214 struct netlink_ext_ack *extack) 215 { 216 int err; 217 218 err = cls_bpf_offload_cmd(tp, NULL, prog, extack); 219 if (err) 220 pr_err("Stopping hardware offload failed: %d\n", err); 221 } 222 223 static void cls_bpf_offload_update_stats(struct tcf_proto *tp, 224 struct cls_bpf_prog *prog) 225 { 226 struct tcf_block *block = tp->chain->block; 227 struct tc_cls_bpf_offload cls_bpf = {}; 228 229 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL); 230 cls_bpf.command = TC_CLSBPF_STATS; 231 cls_bpf.exts = &prog->exts; 232 cls_bpf.prog = prog->filter; 233 cls_bpf.name = prog->bpf_name; 234 cls_bpf.exts_integrated = prog->exts_integrated; 235 236 tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false); 237 } 238 239 static int cls_bpf_init(struct tcf_proto *tp) 240 { 241 struct cls_bpf_head *head; 242 243 head = kzalloc(sizeof(*head), GFP_KERNEL); 244 if (head == NULL) 245 return -ENOBUFS; 246 247 INIT_LIST_HEAD_RCU(&head->plist); 248 idr_init(&head->handle_idr); 249 rcu_assign_pointer(tp->root, head); 250 251 return 0; 252 } 253 254 static void cls_bpf_free_parms(struct cls_bpf_prog *prog) 255 { 256 if (cls_bpf_is_ebpf(prog)) 257 bpf_prog_put(prog->filter); 258 else 259 bpf_prog_destroy(prog->filter); 260 261 kfree(prog->bpf_name); 262 kfree(prog->bpf_ops); 263 } 264 265 static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) 266 { 267 tcf_exts_destroy(&prog->exts); 268 tcf_exts_put_net(&prog->exts); 269 270 cls_bpf_free_parms(prog); 271 kfree(prog); 272 } 273 274 static void cls_bpf_delete_prog_work(struct work_struct *work) 275 { 276 struct cls_bpf_prog *prog = container_of(to_rcu_work(work), 277 struct cls_bpf_prog, 278 rwork); 279 rtnl_lock(); 280 __cls_bpf_delete_prog(prog); 281 rtnl_unlock(); 282 } 283 284 static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, 285 struct netlink_ext_ack *extack) 286 { 287 struct cls_bpf_head *head = rtnl_dereference(tp->root); 288 289 idr_remove(&head->handle_idr, prog->handle); 290 cls_bpf_stop_offload(tp, prog, extack); 291 list_del_rcu(&prog->link); 292 tcf_unbind_filter(tp, &prog->res); 293 if (tcf_exts_get_net(&prog->exts)) 294 tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); 295 else 296 __cls_bpf_delete_prog(prog); 297 } 298 299 static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, 300 bool rtnl_held, struct netlink_ext_ack *extack) 301 { 302 struct cls_bpf_head *head = rtnl_dereference(tp->root); 303 304 __cls_bpf_delete(tp, arg, extack); 305 *last = list_empty(&head->plist); 306 return 0; 307 } 308 309 static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held, 310 struct netlink_ext_ack *extack) 311 { 312 struct cls_bpf_head *head = rtnl_dereference(tp->root); 313 struct cls_bpf_prog *prog, *tmp; 314 315 list_for_each_entry_safe(prog, tmp, &head->plist, link) 316 __cls_bpf_delete(tp, prog, extack); 317 318 idr_destroy(&head->handle_idr); 319 kfree_rcu(head, rcu); 320 } 321 322 static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) 323 { 324 struct cls_bpf_head *head = rtnl_dereference(tp->root); 325 struct cls_bpf_prog *prog; 326 327 list_for_each_entry(prog, &head->plist, link) { 328 if (prog->handle == handle) 329 return prog; 330 } 331 332 return NULL; 333 } 334 335 static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) 336 { 337 struct sock_filter *bpf_ops; 338 struct sock_fprog_kern fprog_tmp; 339 struct bpf_prog *fp; 340 u16 bpf_size, bpf_num_ops; 341 int ret; 342 343 bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); 344 if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) 345 return -EINVAL; 346 347 bpf_size = bpf_num_ops * sizeof(*bpf_ops); 348 if (bpf_size != nla_len(tb[TCA_BPF_OPS])) 349 return -EINVAL; 350 351 bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL); 352 if (bpf_ops == NULL) 353 return -ENOMEM; 354 355 fprog_tmp.len = bpf_num_ops; 356 fprog_tmp.filter = bpf_ops; 357 358 ret = bpf_prog_create(&fp, &fprog_tmp); 359 if (ret < 0) { 360 kfree(bpf_ops); 361 return ret; 362 } 363 364 prog->bpf_ops = bpf_ops; 365 prog->bpf_num_ops = bpf_num_ops; 366 prog->bpf_name = NULL; 367 prog->filter = fp; 368 369 return 0; 370 } 371 372 static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, 373 u32 gen_flags, const struct tcf_proto *tp) 374 { 375 struct bpf_prog *fp; 376 char *name = NULL; 377 bool skip_sw; 378 u32 bpf_fd; 379 380 bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); 381 skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; 382 383 fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); 384 if (IS_ERR(fp)) 385 return PTR_ERR(fp); 386 387 if (tb[TCA_BPF_NAME]) { 388 name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); 389 if (!name) { 390 bpf_prog_put(fp); 391 return -ENOMEM; 392 } 393 } 394 395 prog->bpf_ops = NULL; 396 prog->bpf_name = name; 397 prog->filter = fp; 398 399 if (fp->dst_needed) 400 tcf_block_netif_keep_dst(tp->chain->block); 401 402 return 0; 403 } 404 405 static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, 406 struct cls_bpf_prog *prog, unsigned long base, 407 struct nlattr **tb, struct nlattr *est, bool ovr, 408 struct netlink_ext_ack *extack) 409 { 410 bool is_bpf, is_ebpf, have_exts = false; 411 u32 gen_flags = 0; 412 int ret; 413 414 is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; 415 is_ebpf = tb[TCA_BPF_FD]; 416 if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) 417 return -EINVAL; 418 419 ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, true, 420 extack); 421 if (ret < 0) 422 return ret; 423 424 if (tb[TCA_BPF_FLAGS]) { 425 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); 426 427 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) 428 return -EINVAL; 429 430 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; 431 } 432 if (tb[TCA_BPF_FLAGS_GEN]) { 433 gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); 434 if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || 435 !tc_flags_valid(gen_flags)) 436 return -EINVAL; 437 } 438 439 prog->exts_integrated = have_exts; 440 prog->gen_flags = gen_flags; 441 442 ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : 443 cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); 444 if (ret < 0) 445 return ret; 446 447 if (tb[TCA_BPF_CLASSID]) { 448 prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); 449 tcf_bind_filter(tp, &prog->res, base); 450 } 451 452 return 0; 453 } 454 455 static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, 456 struct tcf_proto *tp, unsigned long base, 457 u32 handle, struct nlattr **tca, 458 void **arg, bool ovr, bool rtnl_held, 459 struct netlink_ext_ack *extack) 460 { 461 struct cls_bpf_head *head = rtnl_dereference(tp->root); 462 struct cls_bpf_prog *oldprog = *arg; 463 struct nlattr *tb[TCA_BPF_MAX + 1]; 464 struct cls_bpf_prog *prog; 465 int ret; 466 467 if (tca[TCA_OPTIONS] == NULL) 468 return -EINVAL; 469 470 ret = nla_parse_nested_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], 471 bpf_policy, NULL); 472 if (ret < 0) 473 return ret; 474 475 prog = kzalloc(sizeof(*prog), GFP_KERNEL); 476 if (!prog) 477 return -ENOBUFS; 478 479 ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE); 480 if (ret < 0) 481 goto errout; 482 483 if (oldprog) { 484 if (handle && oldprog->handle != handle) { 485 ret = -EINVAL; 486 goto errout; 487 } 488 } 489 490 if (handle == 0) { 491 handle = 1; 492 ret = idr_alloc_u32(&head->handle_idr, prog, &handle, 493 INT_MAX, GFP_KERNEL); 494 } else if (!oldprog) { 495 ret = idr_alloc_u32(&head->handle_idr, prog, &handle, 496 handle, GFP_KERNEL); 497 } 498 499 if (ret) 500 goto errout; 501 prog->handle = handle; 502 503 ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr, 504 extack); 505 if (ret < 0) 506 goto errout_idr; 507 508 ret = cls_bpf_offload(tp, prog, oldprog, extack); 509 if (ret) 510 goto errout_parms; 511 512 if (!tc_in_hw(prog->gen_flags)) 513 prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; 514 515 if (oldprog) { 516 idr_replace(&head->handle_idr, prog, handle); 517 list_replace_rcu(&oldprog->link, &prog->link); 518 tcf_unbind_filter(tp, &oldprog->res); 519 tcf_exts_get_net(&oldprog->exts); 520 tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); 521 } else { 522 list_add_rcu(&prog->link, &head->plist); 523 } 524 525 *arg = prog; 526 return 0; 527 528 errout_parms: 529 cls_bpf_free_parms(prog); 530 errout_idr: 531 if (!oldprog) 532 idr_remove(&head->handle_idr, prog->handle); 533 errout: 534 tcf_exts_destroy(&prog->exts); 535 kfree(prog); 536 return ret; 537 } 538 539 static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, 540 struct sk_buff *skb) 541 { 542 struct nlattr *nla; 543 544 if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) 545 return -EMSGSIZE; 546 547 nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * 548 sizeof(struct sock_filter)); 549 if (nla == NULL) 550 return -EMSGSIZE; 551 552 memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); 553 554 return 0; 555 } 556 557 static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, 558 struct sk_buff *skb) 559 { 560 struct nlattr *nla; 561 562 if (prog->bpf_name && 563 nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) 564 return -EMSGSIZE; 565 566 if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) 567 return -EMSGSIZE; 568 569 nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); 570 if (nla == NULL) 571 return -EMSGSIZE; 572 573 memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); 574 575 return 0; 576 } 577 578 static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, 579 struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held) 580 { 581 struct cls_bpf_prog *prog = fh; 582 struct nlattr *nest; 583 u32 bpf_flags = 0; 584 int ret; 585 586 if (prog == NULL) 587 return skb->len; 588 589 tm->tcm_handle = prog->handle; 590 591 cls_bpf_offload_update_stats(tp, prog); 592 593 nest = nla_nest_start_noflag(skb, TCA_OPTIONS); 594 if (nest == NULL) 595 goto nla_put_failure; 596 597 if (prog->res.classid && 598 nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) 599 goto nla_put_failure; 600 601 if (cls_bpf_is_ebpf(prog)) 602 ret = cls_bpf_dump_ebpf_info(prog, skb); 603 else 604 ret = cls_bpf_dump_bpf_info(prog, skb); 605 if (ret) 606 goto nla_put_failure; 607 608 if (tcf_exts_dump(skb, &prog->exts) < 0) 609 goto nla_put_failure; 610 611 if (prog->exts_integrated) 612 bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; 613 if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) 614 goto nla_put_failure; 615 if (prog->gen_flags && 616 nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) 617 goto nla_put_failure; 618 619 nla_nest_end(skb, nest); 620 621 if (tcf_exts_dump_stats(skb, &prog->exts) < 0) 622 goto nla_put_failure; 623 624 return skb->len; 625 626 nla_put_failure: 627 nla_nest_cancel(skb, nest); 628 return -1; 629 } 630 631 static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) 632 { 633 struct cls_bpf_prog *prog = fh; 634 635 if (prog && prog->res.classid == classid) 636 prog->res.class = cl; 637 } 638 639 static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg, 640 bool rtnl_held) 641 { 642 struct cls_bpf_head *head = rtnl_dereference(tp->root); 643 struct cls_bpf_prog *prog; 644 645 list_for_each_entry(prog, &head->plist, link) { 646 if (arg->count < arg->skip) 647 goto skip; 648 if (arg->fn(tp, prog, arg) < 0) { 649 arg->stop = 1; 650 break; 651 } 652 skip: 653 arg->count++; 654 } 655 } 656 657 static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb, 658 void *cb_priv, struct netlink_ext_ack *extack) 659 { 660 struct cls_bpf_head *head = rtnl_dereference(tp->root); 661 struct tcf_block *block = tp->chain->block; 662 struct tc_cls_bpf_offload cls_bpf = {}; 663 struct cls_bpf_prog *prog; 664 int err; 665 666 list_for_each_entry(prog, &head->plist, link) { 667 if (tc_skip_hw(prog->gen_flags)) 668 continue; 669 670 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, 671 extack); 672 cls_bpf.command = TC_CLSBPF_OFFLOAD; 673 cls_bpf.exts = &prog->exts; 674 cls_bpf.prog = add ? prog->filter : NULL; 675 cls_bpf.oldprog = add ? NULL : prog->filter; 676 cls_bpf.name = prog->bpf_name; 677 cls_bpf.exts_integrated = prog->exts_integrated; 678 679 err = cb(TC_SETUP_CLSBPF, &cls_bpf, cb_priv); 680 if (err) { 681 if (add && tc_skip_sw(prog->gen_flags)) 682 return err; 683 continue; 684 } 685 686 tc_cls_offload_cnt_update(block, &prog->in_hw_count, 687 &prog->gen_flags, add); 688 } 689 690 return 0; 691 } 692 693 static struct tcf_proto_ops cls_bpf_ops __read_mostly = { 694 .kind = "bpf", 695 .owner = THIS_MODULE, 696 .classify = cls_bpf_classify, 697 .init = cls_bpf_init, 698 .destroy = cls_bpf_destroy, 699 .get = cls_bpf_get, 700 .change = cls_bpf_change, 701 .delete = cls_bpf_delete, 702 .walk = cls_bpf_walk, 703 .reoffload = cls_bpf_reoffload, 704 .dump = cls_bpf_dump, 705 .bind_class = cls_bpf_bind_class, 706 }; 707 708 static int __init cls_bpf_init_mod(void) 709 { 710 return register_tcf_proto_ops(&cls_bpf_ops); 711 } 712 713 static void __exit cls_bpf_exit_mod(void) 714 { 715 unregister_tcf_proto_ops(&cls_bpf_ops); 716 } 717 718 module_init(cls_bpf_init_mod); 719 module_exit(cls_bpf_exit_mod); 720