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, 161 extack); 162 cls_bpf.command = TC_CLSBPF_OFFLOAD; 163 cls_bpf.exts = &obj->exts; 164 cls_bpf.prog = prog ? prog->filter : NULL; 165 cls_bpf.oldprog = oldprog ? oldprog->filter : NULL; 166 cls_bpf.name = obj->bpf_name; 167 cls_bpf.exts_integrated = obj->exts_integrated; 168 169 if (oldprog) 170 tcf_block_offload_dec(block, &oldprog->gen_flags); 171 172 err = tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); 173 if (prog) { 174 if (err < 0) { 175 cls_bpf_offload_cmd(tp, oldprog, prog, extack); 176 return err; 177 } else if (err > 0) { 178 prog->in_hw_count = err; 179 tcf_block_offload_inc(block, &prog->gen_flags); 180 } 181 } 182 183 if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) 184 return -EINVAL; 185 186 return 0; 187 } 188 189 static u32 cls_bpf_flags(u32 flags) 190 { 191 return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; 192 } 193 194 static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, 195 struct cls_bpf_prog *oldprog, 196 struct netlink_ext_ack *extack) 197 { 198 if (prog && oldprog && 199 cls_bpf_flags(prog->gen_flags) != 200 cls_bpf_flags(oldprog->gen_flags)) 201 return -EINVAL; 202 203 if (prog && tc_skip_hw(prog->gen_flags)) 204 prog = NULL; 205 if (oldprog && tc_skip_hw(oldprog->gen_flags)) 206 oldprog = NULL; 207 if (!prog && !oldprog) 208 return 0; 209 210 return cls_bpf_offload_cmd(tp, prog, oldprog, extack); 211 } 212 213 static void cls_bpf_stop_offload(struct tcf_proto *tp, 214 struct cls_bpf_prog *prog, 215 struct netlink_ext_ack *extack) 216 { 217 int err; 218 219 err = cls_bpf_offload_cmd(tp, NULL, prog, extack); 220 if (err) 221 pr_err("Stopping hardware offload failed: %d\n", err); 222 } 223 224 static void cls_bpf_offload_update_stats(struct tcf_proto *tp, 225 struct cls_bpf_prog *prog) 226 { 227 struct tcf_block *block = tp->chain->block; 228 struct tc_cls_bpf_offload cls_bpf = {}; 229 230 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL); 231 cls_bpf.command = TC_CLSBPF_STATS; 232 cls_bpf.exts = &prog->exts; 233 cls_bpf.prog = prog->filter; 234 cls_bpf.name = prog->bpf_name; 235 cls_bpf.exts_integrated = prog->exts_integrated; 236 237 tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false); 238 } 239 240 static int cls_bpf_init(struct tcf_proto *tp) 241 { 242 struct cls_bpf_head *head; 243 244 head = kzalloc(sizeof(*head), GFP_KERNEL); 245 if (head == NULL) 246 return -ENOBUFS; 247 248 INIT_LIST_HEAD_RCU(&head->plist); 249 idr_init(&head->handle_idr); 250 rcu_assign_pointer(tp->root, head); 251 252 return 0; 253 } 254 255 static void cls_bpf_free_parms(struct cls_bpf_prog *prog) 256 { 257 if (cls_bpf_is_ebpf(prog)) 258 bpf_prog_put(prog->filter); 259 else 260 bpf_prog_destroy(prog->filter); 261 262 kfree(prog->bpf_name); 263 kfree(prog->bpf_ops); 264 } 265 266 static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) 267 { 268 tcf_exts_destroy(&prog->exts); 269 tcf_exts_put_net(&prog->exts); 270 271 cls_bpf_free_parms(prog); 272 kfree(prog); 273 } 274 275 static void cls_bpf_delete_prog_work(struct work_struct *work) 276 { 277 struct cls_bpf_prog *prog = container_of(to_rcu_work(work), 278 struct cls_bpf_prog, 279 rwork); 280 rtnl_lock(); 281 __cls_bpf_delete_prog(prog); 282 rtnl_unlock(); 283 } 284 285 static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, 286 struct netlink_ext_ack *extack) 287 { 288 struct cls_bpf_head *head = rtnl_dereference(tp->root); 289 290 idr_remove(&head->handle_idr, prog->handle); 291 cls_bpf_stop_offload(tp, prog, extack); 292 list_del_rcu(&prog->link); 293 tcf_unbind_filter(tp, &prog->res); 294 if (tcf_exts_get_net(&prog->exts)) 295 tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); 296 else 297 __cls_bpf_delete_prog(prog); 298 } 299 300 static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, 301 bool rtnl_held, struct netlink_ext_ack *extack) 302 { 303 struct cls_bpf_head *head = rtnl_dereference(tp->root); 304 305 __cls_bpf_delete(tp, arg, extack); 306 *last = list_empty(&head->plist); 307 return 0; 308 } 309 310 static void cls_bpf_destroy(struct tcf_proto *tp, bool rtnl_held, 311 struct netlink_ext_ack *extack) 312 { 313 struct cls_bpf_head *head = rtnl_dereference(tp->root); 314 struct cls_bpf_prog *prog, *tmp; 315 316 list_for_each_entry_safe(prog, tmp, &head->plist, link) 317 __cls_bpf_delete(tp, prog, extack); 318 319 idr_destroy(&head->handle_idr); 320 kfree_rcu(head, rcu); 321 } 322 323 static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) 324 { 325 struct cls_bpf_head *head = rtnl_dereference(tp->root); 326 struct cls_bpf_prog *prog; 327 328 list_for_each_entry(prog, &head->plist, link) { 329 if (prog->handle == handle) 330 return prog; 331 } 332 333 return NULL; 334 } 335 336 static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) 337 { 338 struct sock_filter *bpf_ops; 339 struct sock_fprog_kern fprog_tmp; 340 struct bpf_prog *fp; 341 u16 bpf_size, bpf_num_ops; 342 int ret; 343 344 bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); 345 if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) 346 return -EINVAL; 347 348 bpf_size = bpf_num_ops * sizeof(*bpf_ops); 349 if (bpf_size != nla_len(tb[TCA_BPF_OPS])) 350 return -EINVAL; 351 352 bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL); 353 if (bpf_ops == NULL) 354 return -ENOMEM; 355 356 fprog_tmp.len = bpf_num_ops; 357 fprog_tmp.filter = bpf_ops; 358 359 ret = bpf_prog_create(&fp, &fprog_tmp); 360 if (ret < 0) { 361 kfree(bpf_ops); 362 return ret; 363 } 364 365 prog->bpf_ops = bpf_ops; 366 prog->bpf_num_ops = bpf_num_ops; 367 prog->bpf_name = NULL; 368 prog->filter = fp; 369 370 return 0; 371 } 372 373 static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, 374 u32 gen_flags, const struct tcf_proto *tp) 375 { 376 struct bpf_prog *fp; 377 char *name = NULL; 378 bool skip_sw; 379 u32 bpf_fd; 380 381 bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); 382 skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; 383 384 fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); 385 if (IS_ERR(fp)) 386 return PTR_ERR(fp); 387 388 if (tb[TCA_BPF_NAME]) { 389 name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); 390 if (!name) { 391 bpf_prog_put(fp); 392 return -ENOMEM; 393 } 394 } 395 396 prog->bpf_ops = NULL; 397 prog->bpf_name = name; 398 prog->filter = fp; 399 400 if (fp->dst_needed) 401 tcf_block_netif_keep_dst(tp->chain->block); 402 403 return 0; 404 } 405 406 static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, 407 struct cls_bpf_prog *prog, unsigned long base, 408 struct nlattr **tb, struct nlattr *est, bool ovr, 409 struct netlink_ext_ack *extack) 410 { 411 bool is_bpf, is_ebpf, have_exts = false; 412 u32 gen_flags = 0; 413 int ret; 414 415 is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; 416 is_ebpf = tb[TCA_BPF_FD]; 417 if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) 418 return -EINVAL; 419 420 ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, true, 421 extack); 422 if (ret < 0) 423 return ret; 424 425 if (tb[TCA_BPF_FLAGS]) { 426 u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); 427 428 if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) 429 return -EINVAL; 430 431 have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; 432 } 433 if (tb[TCA_BPF_FLAGS_GEN]) { 434 gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); 435 if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || 436 !tc_flags_valid(gen_flags)) 437 return -EINVAL; 438 } 439 440 prog->exts_integrated = have_exts; 441 prog->gen_flags = gen_flags; 442 443 ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : 444 cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); 445 if (ret < 0) 446 return ret; 447 448 if (tb[TCA_BPF_CLASSID]) { 449 prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); 450 tcf_bind_filter(tp, &prog->res, base); 451 } 452 453 return 0; 454 } 455 456 static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, 457 struct tcf_proto *tp, unsigned long base, 458 u32 handle, struct nlattr **tca, 459 void **arg, bool ovr, bool rtnl_held, 460 struct netlink_ext_ack *extack) 461 { 462 struct cls_bpf_head *head = rtnl_dereference(tp->root); 463 struct cls_bpf_prog *oldprog = *arg; 464 struct nlattr *tb[TCA_BPF_MAX + 1]; 465 struct cls_bpf_prog *prog; 466 int ret; 467 468 if (tca[TCA_OPTIONS] == NULL) 469 return -EINVAL; 470 471 ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, 472 NULL); 473 if (ret < 0) 474 return ret; 475 476 prog = kzalloc(sizeof(*prog), GFP_KERNEL); 477 if (!prog) 478 return -ENOBUFS; 479 480 ret = tcf_exts_init(&prog->exts, net, TCA_BPF_ACT, TCA_BPF_POLICE); 481 if (ret < 0) 482 goto errout; 483 484 if (oldprog) { 485 if (handle && oldprog->handle != handle) { 486 ret = -EINVAL; 487 goto errout; 488 } 489 } 490 491 if (handle == 0) { 492 handle = 1; 493 ret = idr_alloc_u32(&head->handle_idr, prog, &handle, 494 INT_MAX, GFP_KERNEL); 495 } else if (!oldprog) { 496 ret = idr_alloc_u32(&head->handle_idr, prog, &handle, 497 handle, GFP_KERNEL); 498 } 499 500 if (ret) 501 goto errout; 502 prog->handle = handle; 503 504 ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr, 505 extack); 506 if (ret < 0) 507 goto errout_idr; 508 509 ret = cls_bpf_offload(tp, prog, oldprog, extack); 510 if (ret) 511 goto errout_parms; 512 513 if (!tc_in_hw(prog->gen_flags)) 514 prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; 515 516 if (oldprog) { 517 idr_replace(&head->handle_idr, prog, handle); 518 list_replace_rcu(&oldprog->link, &prog->link); 519 tcf_unbind_filter(tp, &oldprog->res); 520 tcf_exts_get_net(&oldprog->exts); 521 tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); 522 } else { 523 list_add_rcu(&prog->link, &head->plist); 524 } 525 526 *arg = prog; 527 return 0; 528 529 errout_parms: 530 cls_bpf_free_parms(prog); 531 errout_idr: 532 if (!oldprog) 533 idr_remove(&head->handle_idr, prog->handle); 534 errout: 535 tcf_exts_destroy(&prog->exts); 536 kfree(prog); 537 return ret; 538 } 539 540 static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, 541 struct sk_buff *skb) 542 { 543 struct nlattr *nla; 544 545 if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) 546 return -EMSGSIZE; 547 548 nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * 549 sizeof(struct sock_filter)); 550 if (nla == NULL) 551 return -EMSGSIZE; 552 553 memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); 554 555 return 0; 556 } 557 558 static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, 559 struct sk_buff *skb) 560 { 561 struct nlattr *nla; 562 563 if (prog->bpf_name && 564 nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) 565 return -EMSGSIZE; 566 567 if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) 568 return -EMSGSIZE; 569 570 nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); 571 if (nla == NULL) 572 return -EMSGSIZE; 573 574 memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); 575 576 return 0; 577 } 578 579 static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, 580 struct sk_buff *skb, struct tcmsg *tm, bool rtnl_held) 581 { 582 struct cls_bpf_prog *prog = fh; 583 struct nlattr *nest; 584 u32 bpf_flags = 0; 585 int ret; 586 587 if (prog == NULL) 588 return skb->len; 589 590 tm->tcm_handle = prog->handle; 591 592 cls_bpf_offload_update_stats(tp, prog); 593 594 nest = nla_nest_start(skb, TCA_OPTIONS); 595 if (nest == NULL) 596 goto nla_put_failure; 597 598 if (prog->res.classid && 599 nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) 600 goto nla_put_failure; 601 602 if (cls_bpf_is_ebpf(prog)) 603 ret = cls_bpf_dump_ebpf_info(prog, skb); 604 else 605 ret = cls_bpf_dump_bpf_info(prog, skb); 606 if (ret) 607 goto nla_put_failure; 608 609 if (tcf_exts_dump(skb, &prog->exts) < 0) 610 goto nla_put_failure; 611 612 if (prog->exts_integrated) 613 bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; 614 if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) 615 goto nla_put_failure; 616 if (prog->gen_flags && 617 nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) 618 goto nla_put_failure; 619 620 nla_nest_end(skb, nest); 621 622 if (tcf_exts_dump_stats(skb, &prog->exts) < 0) 623 goto nla_put_failure; 624 625 return skb->len; 626 627 nla_put_failure: 628 nla_nest_cancel(skb, nest); 629 return -1; 630 } 631 632 static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl) 633 { 634 struct cls_bpf_prog *prog = fh; 635 636 if (prog && prog->res.classid == classid) 637 prog->res.class = cl; 638 } 639 640 static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg, 641 bool rtnl_held) 642 { 643 struct cls_bpf_head *head = rtnl_dereference(tp->root); 644 struct cls_bpf_prog *prog; 645 646 list_for_each_entry(prog, &head->plist, link) { 647 if (arg->count < arg->skip) 648 goto skip; 649 if (arg->fn(tp, prog, arg) < 0) { 650 arg->stop = 1; 651 break; 652 } 653 skip: 654 arg->count++; 655 } 656 } 657 658 static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb, 659 void *cb_priv, struct netlink_ext_ack *extack) 660 { 661 struct cls_bpf_head *head = rtnl_dereference(tp->root); 662 struct tcf_block *block = tp->chain->block; 663 struct tc_cls_bpf_offload cls_bpf = {}; 664 struct cls_bpf_prog *prog; 665 int err; 666 667 list_for_each_entry(prog, &head->plist, link) { 668 if (tc_skip_hw(prog->gen_flags)) 669 continue; 670 671 tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, 672 extack); 673 cls_bpf.command = TC_CLSBPF_OFFLOAD; 674 cls_bpf.exts = &prog->exts; 675 cls_bpf.prog = add ? prog->filter : NULL; 676 cls_bpf.oldprog = add ? NULL : prog->filter; 677 cls_bpf.name = prog->bpf_name; 678 cls_bpf.exts_integrated = prog->exts_integrated; 679 680 err = cb(TC_SETUP_CLSBPF, &cls_bpf, cb_priv); 681 if (err) { 682 if (add && tc_skip_sw(prog->gen_flags)) 683 return err; 684 continue; 685 } 686 687 tc_cls_offload_cnt_update(block, &prog->in_hw_count, 688 &prog->gen_flags, add); 689 } 690 691 return 0; 692 } 693 694 static struct tcf_proto_ops cls_bpf_ops __read_mostly = { 695 .kind = "bpf", 696 .owner = THIS_MODULE, 697 .classify = cls_bpf_classify, 698 .init = cls_bpf_init, 699 .destroy = cls_bpf_destroy, 700 .get = cls_bpf_get, 701 .change = cls_bpf_change, 702 .delete = cls_bpf_delete, 703 .walk = cls_bpf_walk, 704 .reoffload = cls_bpf_reoffload, 705 .dump = cls_bpf_dump, 706 .bind_class = cls_bpf_bind_class, 707 }; 708 709 static int __init cls_bpf_init_mod(void) 710 { 711 return register_tcf_proto_ops(&cls_bpf_ops); 712 } 713 714 static void __exit cls_bpf_exit_mod(void) 715 { 716 unregister_tcf_proto_ops(&cls_bpf_ops); 717 } 718 719 module_init(cls_bpf_init_mod); 720 module_exit(cls_bpf_exit_mod); 721