1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2017 Facebook 3 */ 4 #include <linux/bpf.h> 5 #include <linux/btf.h> 6 #include <linux/btf_ids.h> 7 #include <linux/slab.h> 8 #include <linux/init.h> 9 #include <linux/vmalloc.h> 10 #include <linux/etherdevice.h> 11 #include <linux/filter.h> 12 #include <linux/rcupdate_trace.h> 13 #include <linux/sched/signal.h> 14 #include <net/bpf_sk_storage.h> 15 #include <net/sock.h> 16 #include <net/tcp.h> 17 #include <net/net_namespace.h> 18 #include <net/page_pool.h> 19 #include <linux/error-injection.h> 20 #include <linux/smp.h> 21 #include <linux/sock_diag.h> 22 #include <net/xdp.h> 23 24 #define CREATE_TRACE_POINTS 25 #include <trace/events/bpf_test_run.h> 26 27 struct bpf_test_timer { 28 enum { NO_PREEMPT, NO_MIGRATE } mode; 29 u32 i; 30 u64 time_start, time_spent; 31 }; 32 33 static void bpf_test_timer_enter(struct bpf_test_timer *t) 34 __acquires(rcu) 35 { 36 rcu_read_lock(); 37 if (t->mode == NO_PREEMPT) 38 preempt_disable(); 39 else 40 migrate_disable(); 41 42 t->time_start = ktime_get_ns(); 43 } 44 45 static void bpf_test_timer_leave(struct bpf_test_timer *t) 46 __releases(rcu) 47 { 48 t->time_start = 0; 49 50 if (t->mode == NO_PREEMPT) 51 preempt_enable(); 52 else 53 migrate_enable(); 54 rcu_read_unlock(); 55 } 56 57 static bool bpf_test_timer_continue(struct bpf_test_timer *t, int iterations, 58 u32 repeat, int *err, u32 *duration) 59 __must_hold(rcu) 60 { 61 t->i += iterations; 62 if (t->i >= repeat) { 63 /* We're done. */ 64 t->time_spent += ktime_get_ns() - t->time_start; 65 do_div(t->time_spent, t->i); 66 *duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent; 67 *err = 0; 68 goto reset; 69 } 70 71 if (signal_pending(current)) { 72 /* During iteration: we've been cancelled, abort. */ 73 *err = -EINTR; 74 goto reset; 75 } 76 77 if (need_resched()) { 78 /* During iteration: we need to reschedule between runs. */ 79 t->time_spent += ktime_get_ns() - t->time_start; 80 bpf_test_timer_leave(t); 81 cond_resched(); 82 bpf_test_timer_enter(t); 83 } 84 85 /* Do another round. */ 86 return true; 87 88 reset: 89 t->i = 0; 90 return false; 91 } 92 93 /* We put this struct at the head of each page with a context and frame 94 * initialised when the page is allocated, so we don't have to do this on each 95 * repetition of the test run. 96 */ 97 struct xdp_page_head { 98 struct xdp_buff orig_ctx; 99 struct xdp_buff ctx; 100 struct xdp_frame frm; 101 u8 data[]; 102 }; 103 104 struct xdp_test_data { 105 struct xdp_buff *orig_ctx; 106 struct xdp_rxq_info rxq; 107 struct net_device *dev; 108 struct page_pool *pp; 109 struct xdp_frame **frames; 110 struct sk_buff **skbs; 111 struct xdp_mem_info mem; 112 u32 batch_size; 113 u32 frame_cnt; 114 }; 115 116 #define TEST_XDP_FRAME_SIZE (PAGE_SIZE - sizeof(struct xdp_page_head)) 117 #define TEST_XDP_MAX_BATCH 256 118 119 static void xdp_test_run_init_page(struct page *page, void *arg) 120 { 121 struct xdp_page_head *head = phys_to_virt(page_to_phys(page)); 122 struct xdp_buff *new_ctx, *orig_ctx; 123 u32 headroom = XDP_PACKET_HEADROOM; 124 struct xdp_test_data *xdp = arg; 125 size_t frm_len, meta_len; 126 struct xdp_frame *frm; 127 void *data; 128 129 orig_ctx = xdp->orig_ctx; 130 frm_len = orig_ctx->data_end - orig_ctx->data_meta; 131 meta_len = orig_ctx->data - orig_ctx->data_meta; 132 headroom -= meta_len; 133 134 new_ctx = &head->ctx; 135 frm = &head->frm; 136 data = &head->data; 137 memcpy(data + headroom, orig_ctx->data_meta, frm_len); 138 139 xdp_init_buff(new_ctx, TEST_XDP_FRAME_SIZE, &xdp->rxq); 140 xdp_prepare_buff(new_ctx, data, headroom, frm_len, true); 141 new_ctx->data = new_ctx->data_meta + meta_len; 142 143 xdp_update_frame_from_buff(new_ctx, frm); 144 frm->mem = new_ctx->rxq->mem; 145 146 memcpy(&head->orig_ctx, new_ctx, sizeof(head->orig_ctx)); 147 } 148 149 static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_ctx) 150 { 151 struct page_pool *pp; 152 int err = -ENOMEM; 153 struct page_pool_params pp_params = { 154 .order = 0, 155 .flags = 0, 156 .pool_size = xdp->batch_size, 157 .nid = NUMA_NO_NODE, 158 .init_callback = xdp_test_run_init_page, 159 .init_arg = xdp, 160 }; 161 162 xdp->frames = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL); 163 if (!xdp->frames) 164 return -ENOMEM; 165 166 xdp->skbs = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL); 167 if (!xdp->skbs) 168 goto err_skbs; 169 170 pp = page_pool_create(&pp_params); 171 if (IS_ERR(pp)) { 172 err = PTR_ERR(pp); 173 goto err_pp; 174 } 175 176 /* will copy 'mem.id' into pp->xdp_mem_id */ 177 err = xdp_reg_mem_model(&xdp->mem, MEM_TYPE_PAGE_POOL, pp); 178 if (err) 179 goto err_mmodel; 180 181 xdp->pp = pp; 182 183 /* We create a 'fake' RXQ referencing the original dev, but with an 184 * xdp_mem_info pointing to our page_pool 185 */ 186 xdp_rxq_info_reg(&xdp->rxq, orig_ctx->rxq->dev, 0, 0); 187 xdp->rxq.mem.type = MEM_TYPE_PAGE_POOL; 188 xdp->rxq.mem.id = pp->xdp_mem_id; 189 xdp->dev = orig_ctx->rxq->dev; 190 xdp->orig_ctx = orig_ctx; 191 192 return 0; 193 194 err_mmodel: 195 page_pool_destroy(pp); 196 err_pp: 197 kvfree(xdp->skbs); 198 err_skbs: 199 kvfree(xdp->frames); 200 return err; 201 } 202 203 static void xdp_test_run_teardown(struct xdp_test_data *xdp) 204 { 205 xdp_unreg_mem_model(&xdp->mem); 206 page_pool_destroy(xdp->pp); 207 kfree(xdp->frames); 208 kfree(xdp->skbs); 209 } 210 211 static bool ctx_was_changed(struct xdp_page_head *head) 212 { 213 return head->orig_ctx.data != head->ctx.data || 214 head->orig_ctx.data_meta != head->ctx.data_meta || 215 head->orig_ctx.data_end != head->ctx.data_end; 216 } 217 218 static void reset_ctx(struct xdp_page_head *head) 219 { 220 if (likely(!ctx_was_changed(head))) 221 return; 222 223 head->ctx.data = head->orig_ctx.data; 224 head->ctx.data_meta = head->orig_ctx.data_meta; 225 head->ctx.data_end = head->orig_ctx.data_end; 226 xdp_update_frame_from_buff(&head->ctx, &head->frm); 227 } 228 229 static int xdp_recv_frames(struct xdp_frame **frames, int nframes, 230 struct sk_buff **skbs, 231 struct net_device *dev) 232 { 233 gfp_t gfp = __GFP_ZERO | GFP_ATOMIC; 234 int i, n; 235 LIST_HEAD(list); 236 237 n = kmem_cache_alloc_bulk(skbuff_head_cache, gfp, nframes, (void **)skbs); 238 if (unlikely(n == 0)) { 239 for (i = 0; i < nframes; i++) 240 xdp_return_frame(frames[i]); 241 return -ENOMEM; 242 } 243 244 for (i = 0; i < nframes; i++) { 245 struct xdp_frame *xdpf = frames[i]; 246 struct sk_buff *skb = skbs[i]; 247 248 skb = __xdp_build_skb_from_frame(xdpf, skb, dev); 249 if (!skb) { 250 xdp_return_frame(xdpf); 251 continue; 252 } 253 254 list_add_tail(&skb->list, &list); 255 } 256 netif_receive_skb_list(&list); 257 258 return 0; 259 } 260 261 static int xdp_test_run_batch(struct xdp_test_data *xdp, struct bpf_prog *prog, 262 u32 repeat) 263 { 264 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); 265 int err = 0, act, ret, i, nframes = 0, batch_sz; 266 struct xdp_frame **frames = xdp->frames; 267 struct xdp_page_head *head; 268 struct xdp_frame *frm; 269 bool redirect = false; 270 struct xdp_buff *ctx; 271 struct page *page; 272 273 batch_sz = min_t(u32, repeat, xdp->batch_size); 274 275 local_bh_disable(); 276 xdp_set_return_frame_no_direct(); 277 278 for (i = 0; i < batch_sz; i++) { 279 page = page_pool_dev_alloc_pages(xdp->pp); 280 if (!page) { 281 err = -ENOMEM; 282 goto out; 283 } 284 285 head = phys_to_virt(page_to_phys(page)); 286 reset_ctx(head); 287 ctx = &head->ctx; 288 frm = &head->frm; 289 xdp->frame_cnt++; 290 291 act = bpf_prog_run_xdp(prog, ctx); 292 293 /* if program changed pkt bounds we need to update the xdp_frame */ 294 if (unlikely(ctx_was_changed(head))) { 295 ret = xdp_update_frame_from_buff(ctx, frm); 296 if (ret) { 297 xdp_return_buff(ctx); 298 continue; 299 } 300 } 301 302 switch (act) { 303 case XDP_TX: 304 /* we can't do a real XDP_TX since we're not in the 305 * driver, so turn it into a REDIRECT back to the same 306 * index 307 */ 308 ri->tgt_index = xdp->dev->ifindex; 309 ri->map_id = INT_MAX; 310 ri->map_type = BPF_MAP_TYPE_UNSPEC; 311 fallthrough; 312 case XDP_REDIRECT: 313 redirect = true; 314 ret = xdp_do_redirect_frame(xdp->dev, ctx, frm, prog); 315 if (ret) 316 xdp_return_buff(ctx); 317 break; 318 case XDP_PASS: 319 frames[nframes++] = frm; 320 break; 321 default: 322 bpf_warn_invalid_xdp_action(NULL, prog, act); 323 fallthrough; 324 case XDP_DROP: 325 xdp_return_buff(ctx); 326 break; 327 } 328 } 329 330 out: 331 if (redirect) 332 xdp_do_flush(); 333 if (nframes) { 334 ret = xdp_recv_frames(frames, nframes, xdp->skbs, xdp->dev); 335 if (ret) 336 err = ret; 337 } 338 339 xdp_clear_return_frame_no_direct(); 340 local_bh_enable(); 341 return err; 342 } 343 344 static int bpf_test_run_xdp_live(struct bpf_prog *prog, struct xdp_buff *ctx, 345 u32 repeat, u32 batch_size, u32 *time) 346 347 { 348 struct xdp_test_data xdp = { .batch_size = batch_size }; 349 struct bpf_test_timer t = { .mode = NO_MIGRATE }; 350 int ret; 351 352 if (!repeat) 353 repeat = 1; 354 355 ret = xdp_test_run_setup(&xdp, ctx); 356 if (ret) 357 return ret; 358 359 bpf_test_timer_enter(&t); 360 do { 361 xdp.frame_cnt = 0; 362 ret = xdp_test_run_batch(&xdp, prog, repeat - t.i); 363 if (unlikely(ret < 0)) 364 break; 365 } while (bpf_test_timer_continue(&t, xdp.frame_cnt, repeat, &ret, time)); 366 bpf_test_timer_leave(&t); 367 368 xdp_test_run_teardown(&xdp); 369 return ret; 370 } 371 372 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, 373 u32 *retval, u32 *time, bool xdp) 374 { 375 struct bpf_prog_array_item item = {.prog = prog}; 376 struct bpf_run_ctx *old_ctx; 377 struct bpf_cg_run_ctx run_ctx; 378 struct bpf_test_timer t = { NO_MIGRATE }; 379 enum bpf_cgroup_storage_type stype; 380 int ret; 381 382 for_each_cgroup_storage_type(stype) { 383 item.cgroup_storage[stype] = bpf_cgroup_storage_alloc(prog, stype); 384 if (IS_ERR(item.cgroup_storage[stype])) { 385 item.cgroup_storage[stype] = NULL; 386 for_each_cgroup_storage_type(stype) 387 bpf_cgroup_storage_free(item.cgroup_storage[stype]); 388 return -ENOMEM; 389 } 390 } 391 392 if (!repeat) 393 repeat = 1; 394 395 bpf_test_timer_enter(&t); 396 old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 397 do { 398 run_ctx.prog_item = &item; 399 if (xdp) 400 *retval = bpf_prog_run_xdp(prog, ctx); 401 else 402 *retval = bpf_prog_run(prog, ctx); 403 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, time)); 404 bpf_reset_run_ctx(old_ctx); 405 bpf_test_timer_leave(&t); 406 407 for_each_cgroup_storage_type(stype) 408 bpf_cgroup_storage_free(item.cgroup_storage[stype]); 409 410 return ret; 411 } 412 413 static int bpf_test_finish(const union bpf_attr *kattr, 414 union bpf_attr __user *uattr, const void *data, 415 struct skb_shared_info *sinfo, u32 size, 416 u32 retval, u32 duration) 417 { 418 void __user *data_out = u64_to_user_ptr(kattr->test.data_out); 419 int err = -EFAULT; 420 u32 copy_size = size; 421 422 /* Clamp copy if the user has provided a size hint, but copy the full 423 * buffer if not to retain old behaviour. 424 */ 425 if (kattr->test.data_size_out && 426 copy_size > kattr->test.data_size_out) { 427 copy_size = kattr->test.data_size_out; 428 err = -ENOSPC; 429 } 430 431 if (data_out) { 432 int len = sinfo ? copy_size - sinfo->xdp_frags_size : copy_size; 433 434 if (len < 0) { 435 err = -ENOSPC; 436 goto out; 437 } 438 439 if (copy_to_user(data_out, data, len)) 440 goto out; 441 442 if (sinfo) { 443 int i, offset = len; 444 u32 data_len; 445 446 for (i = 0; i < sinfo->nr_frags; i++) { 447 skb_frag_t *frag = &sinfo->frags[i]; 448 449 if (offset >= copy_size) { 450 err = -ENOSPC; 451 break; 452 } 453 454 data_len = min_t(u32, copy_size - offset, 455 skb_frag_size(frag)); 456 457 if (copy_to_user(data_out + offset, 458 skb_frag_address(frag), 459 data_len)) 460 goto out; 461 462 offset += data_len; 463 } 464 } 465 } 466 467 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size))) 468 goto out; 469 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval))) 470 goto out; 471 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration))) 472 goto out; 473 if (err != -ENOSPC) 474 err = 0; 475 out: 476 trace_bpf_test_finish(&err); 477 return err; 478 } 479 480 /* Integer types of various sizes and pointer combinations cover variety of 481 * architecture dependent calling conventions. 7+ can be supported in the 482 * future. 483 */ 484 __diag_push(); 485 __diag_ignore_all("-Wmissing-prototypes", 486 "Global functions as their definitions will be in vmlinux BTF"); 487 int noinline bpf_fentry_test1(int a) 488 { 489 return a + 1; 490 } 491 EXPORT_SYMBOL_GPL(bpf_fentry_test1); 492 493 int noinline bpf_fentry_test2(int a, u64 b) 494 { 495 return a + b; 496 } 497 498 int noinline bpf_fentry_test3(char a, int b, u64 c) 499 { 500 return a + b + c; 501 } 502 503 int noinline bpf_fentry_test4(void *a, char b, int c, u64 d) 504 { 505 return (long)a + b + c + d; 506 } 507 508 int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e) 509 { 510 return a + (long)b + c + d + e; 511 } 512 513 int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f) 514 { 515 return a + (long)b + c + d + (long)e + f; 516 } 517 518 struct bpf_fentry_test_t { 519 struct bpf_fentry_test_t *a; 520 }; 521 522 int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg) 523 { 524 return (long)arg; 525 } 526 527 int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg) 528 { 529 return (long)arg->a; 530 } 531 532 int noinline bpf_modify_return_test(int a, int *b) 533 { 534 *b += 1; 535 return a + *b; 536 } 537 538 u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d) 539 { 540 return a + b + c + d; 541 } 542 543 int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b) 544 { 545 return a + b; 546 } 547 548 struct sock * noinline bpf_kfunc_call_test3(struct sock *sk) 549 { 550 return sk; 551 } 552 553 struct prog_test_member1 { 554 int a; 555 }; 556 557 struct prog_test_member { 558 struct prog_test_member1 m; 559 int c; 560 }; 561 562 struct prog_test_ref_kfunc { 563 int a; 564 int b; 565 struct prog_test_member memb; 566 struct prog_test_ref_kfunc *next; 567 refcount_t cnt; 568 }; 569 570 static struct prog_test_ref_kfunc prog_test_struct = { 571 .a = 42, 572 .b = 108, 573 .next = &prog_test_struct, 574 .cnt = REFCOUNT_INIT(1), 575 }; 576 577 noinline struct prog_test_ref_kfunc * 578 bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr) 579 { 580 refcount_inc(&prog_test_struct.cnt); 581 return &prog_test_struct; 582 } 583 584 noinline struct prog_test_member * 585 bpf_kfunc_call_memb_acquire(void) 586 { 587 WARN_ON_ONCE(1); 588 return NULL; 589 } 590 591 noinline void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p) 592 { 593 if (!p) 594 return; 595 596 refcount_dec(&p->cnt); 597 } 598 599 noinline void bpf_kfunc_call_memb_release(struct prog_test_member *p) 600 { 601 } 602 603 noinline void bpf_kfunc_call_memb1_release(struct prog_test_member1 *p) 604 { 605 WARN_ON_ONCE(1); 606 } 607 608 static int *__bpf_kfunc_call_test_get_mem(struct prog_test_ref_kfunc *p, const int size) 609 { 610 if (size > 2 * sizeof(int)) 611 return NULL; 612 613 return (int *)p; 614 } 615 616 noinline int *bpf_kfunc_call_test_get_rdwr_mem(struct prog_test_ref_kfunc *p, const int rdwr_buf_size) 617 { 618 return __bpf_kfunc_call_test_get_mem(p, rdwr_buf_size); 619 } 620 621 noinline int *bpf_kfunc_call_test_get_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) 622 { 623 return __bpf_kfunc_call_test_get_mem(p, rdonly_buf_size); 624 } 625 626 /* the next 2 ones can't be really used for testing expect to ensure 627 * that the verifier rejects the call. 628 * Acquire functions must return struct pointers, so these ones are 629 * failing. 630 */ 631 noinline int *bpf_kfunc_call_test_acq_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size) 632 { 633 return __bpf_kfunc_call_test_get_mem(p, rdonly_buf_size); 634 } 635 636 noinline void bpf_kfunc_call_int_mem_release(int *p) 637 { 638 } 639 640 noinline struct prog_test_ref_kfunc * 641 bpf_kfunc_call_test_kptr_get(struct prog_test_ref_kfunc **pp, int a, int b) 642 { 643 struct prog_test_ref_kfunc *p = READ_ONCE(*pp); 644 645 if (!p) 646 return NULL; 647 refcount_inc(&p->cnt); 648 return p; 649 } 650 651 struct prog_test_pass1 { 652 int x0; 653 struct { 654 int x1; 655 struct { 656 int x2; 657 struct { 658 int x3; 659 }; 660 }; 661 }; 662 }; 663 664 struct prog_test_pass2 { 665 int len; 666 short arr1[4]; 667 struct { 668 char arr2[4]; 669 unsigned long arr3[8]; 670 } x; 671 }; 672 673 struct prog_test_fail1 { 674 void *p; 675 int x; 676 }; 677 678 struct prog_test_fail2 { 679 int x8; 680 struct prog_test_pass1 x; 681 }; 682 683 struct prog_test_fail3 { 684 int len; 685 char arr1[2]; 686 char arr2[]; 687 }; 688 689 noinline void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb) 690 { 691 } 692 693 noinline void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p) 694 { 695 } 696 697 noinline void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p) 698 { 699 } 700 701 noinline void bpf_kfunc_call_test_fail1(struct prog_test_fail1 *p) 702 { 703 } 704 705 noinline void bpf_kfunc_call_test_fail2(struct prog_test_fail2 *p) 706 { 707 } 708 709 noinline void bpf_kfunc_call_test_fail3(struct prog_test_fail3 *p) 710 { 711 } 712 713 noinline void bpf_kfunc_call_test_mem_len_pass1(void *mem, int mem__sz) 714 { 715 } 716 717 noinline void bpf_kfunc_call_test_mem_len_fail1(void *mem, int len) 718 { 719 } 720 721 noinline void bpf_kfunc_call_test_mem_len_fail2(u64 *mem, int len) 722 { 723 } 724 725 noinline void bpf_kfunc_call_test_ref(struct prog_test_ref_kfunc *p) 726 { 727 } 728 729 noinline void bpf_kfunc_call_test_destructive(void) 730 { 731 } 732 733 __diag_pop(); 734 735 BTF_SET8_START(bpf_test_modify_return_ids) 736 BTF_ID_FLAGS(func, bpf_modify_return_test) 737 BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE) 738 BTF_SET8_END(bpf_test_modify_return_ids) 739 740 static const struct btf_kfunc_id_set bpf_test_modify_return_set = { 741 .owner = THIS_MODULE, 742 .set = &bpf_test_modify_return_ids, 743 }; 744 745 BTF_SET8_START(test_sk_check_kfunc_ids) 746 BTF_ID_FLAGS(func, bpf_kfunc_call_test1) 747 BTF_ID_FLAGS(func, bpf_kfunc_call_test2) 748 BTF_ID_FLAGS(func, bpf_kfunc_call_test3) 749 BTF_ID_FLAGS(func, bpf_kfunc_call_test_acquire, KF_ACQUIRE | KF_RET_NULL) 750 BTF_ID_FLAGS(func, bpf_kfunc_call_memb_acquire, KF_ACQUIRE | KF_RET_NULL) 751 BTF_ID_FLAGS(func, bpf_kfunc_call_test_release, KF_RELEASE) 752 BTF_ID_FLAGS(func, bpf_kfunc_call_memb_release, KF_RELEASE) 753 BTF_ID_FLAGS(func, bpf_kfunc_call_memb1_release, KF_RELEASE) 754 BTF_ID_FLAGS(func, bpf_kfunc_call_test_get_rdwr_mem, KF_RET_NULL) 755 BTF_ID_FLAGS(func, bpf_kfunc_call_test_get_rdonly_mem, KF_RET_NULL) 756 BTF_ID_FLAGS(func, bpf_kfunc_call_test_acq_rdonly_mem, KF_ACQUIRE | KF_RET_NULL) 757 BTF_ID_FLAGS(func, bpf_kfunc_call_int_mem_release, KF_RELEASE) 758 BTF_ID_FLAGS(func, bpf_kfunc_call_test_kptr_get, KF_ACQUIRE | KF_RET_NULL | KF_KPTR_GET) 759 BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass_ctx) 760 BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass1) 761 BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass2) 762 BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail1) 763 BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail2) 764 BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail3) 765 BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_pass1) 766 BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_fail1) 767 BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_fail2) 768 BTF_ID_FLAGS(func, bpf_kfunc_call_test_ref, KF_TRUSTED_ARGS) 769 BTF_ID_FLAGS(func, bpf_kfunc_call_test_destructive, KF_DESTRUCTIVE) 770 BTF_SET8_END(test_sk_check_kfunc_ids) 771 772 static void *bpf_test_init(const union bpf_attr *kattr, u32 user_size, 773 u32 size, u32 headroom, u32 tailroom) 774 { 775 void __user *data_in = u64_to_user_ptr(kattr->test.data_in); 776 void *data; 777 778 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom) 779 return ERR_PTR(-EINVAL); 780 781 if (user_size > size) 782 return ERR_PTR(-EMSGSIZE); 783 784 size = SKB_DATA_ALIGN(size); 785 data = kzalloc(size + headroom + tailroom, GFP_USER); 786 if (!data) 787 return ERR_PTR(-ENOMEM); 788 789 if (copy_from_user(data + headroom, data_in, user_size)) { 790 kfree(data); 791 return ERR_PTR(-EFAULT); 792 } 793 794 return data; 795 } 796 797 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 798 const union bpf_attr *kattr, 799 union bpf_attr __user *uattr) 800 { 801 struct bpf_fentry_test_t arg = {}; 802 u16 side_effect = 0, ret = 0; 803 int b = 2, err = -EFAULT; 804 u32 retval = 0; 805 806 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size) 807 return -EINVAL; 808 809 switch (prog->expected_attach_type) { 810 case BPF_TRACE_FENTRY: 811 case BPF_TRACE_FEXIT: 812 if (bpf_fentry_test1(1) != 2 || 813 bpf_fentry_test2(2, 3) != 5 || 814 bpf_fentry_test3(4, 5, 6) != 15 || 815 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 || 816 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 || 817 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 || 818 bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 || 819 bpf_fentry_test8(&arg) != 0) 820 goto out; 821 break; 822 case BPF_MODIFY_RETURN: 823 ret = bpf_modify_return_test(1, &b); 824 if (b != 2) 825 side_effect = 1; 826 break; 827 default: 828 goto out; 829 } 830 831 retval = ((u32)side_effect << 16) | ret; 832 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval))) 833 goto out; 834 835 err = 0; 836 out: 837 trace_bpf_test_finish(&err); 838 return err; 839 } 840 841 struct bpf_raw_tp_test_run_info { 842 struct bpf_prog *prog; 843 void *ctx; 844 u32 retval; 845 }; 846 847 static void 848 __bpf_prog_test_run_raw_tp(void *data) 849 { 850 struct bpf_raw_tp_test_run_info *info = data; 851 852 rcu_read_lock(); 853 info->retval = bpf_prog_run(info->prog, info->ctx); 854 rcu_read_unlock(); 855 } 856 857 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 858 const union bpf_attr *kattr, 859 union bpf_attr __user *uattr) 860 { 861 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); 862 __u32 ctx_size_in = kattr->test.ctx_size_in; 863 struct bpf_raw_tp_test_run_info info; 864 int cpu = kattr->test.cpu, err = 0; 865 int current_cpu; 866 867 /* doesn't support data_in/out, ctx_out, duration, or repeat */ 868 if (kattr->test.data_in || kattr->test.data_out || 869 kattr->test.ctx_out || kattr->test.duration || 870 kattr->test.repeat || kattr->test.batch_size) 871 return -EINVAL; 872 873 if (ctx_size_in < prog->aux->max_ctx_offset || 874 ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64)) 875 return -EINVAL; 876 877 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0) 878 return -EINVAL; 879 880 if (ctx_size_in) { 881 info.ctx = memdup_user(ctx_in, ctx_size_in); 882 if (IS_ERR(info.ctx)) 883 return PTR_ERR(info.ctx); 884 } else { 885 info.ctx = NULL; 886 } 887 888 info.prog = prog; 889 890 current_cpu = get_cpu(); 891 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 || 892 cpu == current_cpu) { 893 __bpf_prog_test_run_raw_tp(&info); 894 } else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) { 895 /* smp_call_function_single() also checks cpu_online() 896 * after csd_lock(). However, since cpu is from user 897 * space, let's do an extra quick check to filter out 898 * invalid value before smp_call_function_single(). 899 */ 900 err = -ENXIO; 901 } else { 902 err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp, 903 &info, 1); 904 } 905 put_cpu(); 906 907 if (!err && 908 copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32))) 909 err = -EFAULT; 910 911 kfree(info.ctx); 912 return err; 913 } 914 915 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size) 916 { 917 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in); 918 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out); 919 u32 size = kattr->test.ctx_size_in; 920 void *data; 921 int err; 922 923 if (!data_in && !data_out) 924 return NULL; 925 926 data = kzalloc(max_size, GFP_USER); 927 if (!data) 928 return ERR_PTR(-ENOMEM); 929 930 if (data_in) { 931 err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size); 932 if (err) { 933 kfree(data); 934 return ERR_PTR(err); 935 } 936 937 size = min_t(u32, max_size, size); 938 if (copy_from_user(data, data_in, size)) { 939 kfree(data); 940 return ERR_PTR(-EFAULT); 941 } 942 } 943 return data; 944 } 945 946 static int bpf_ctx_finish(const union bpf_attr *kattr, 947 union bpf_attr __user *uattr, const void *data, 948 u32 size) 949 { 950 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out); 951 int err = -EFAULT; 952 u32 copy_size = size; 953 954 if (!data || !data_out) 955 return 0; 956 957 if (copy_size > kattr->test.ctx_size_out) { 958 copy_size = kattr->test.ctx_size_out; 959 err = -ENOSPC; 960 } 961 962 if (copy_to_user(data_out, data, copy_size)) 963 goto out; 964 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size))) 965 goto out; 966 if (err != -ENOSPC) 967 err = 0; 968 out: 969 return err; 970 } 971 972 /** 973 * range_is_zero - test whether buffer is initialized 974 * @buf: buffer to check 975 * @from: check from this position 976 * @to: check up until (excluding) this position 977 * 978 * This function returns true if the there is a non-zero byte 979 * in the buf in the range [from,to). 980 */ 981 static inline bool range_is_zero(void *buf, size_t from, size_t to) 982 { 983 return !memchr_inv((u8 *)buf + from, 0, to - from); 984 } 985 986 static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb) 987 { 988 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; 989 990 if (!__skb) 991 return 0; 992 993 /* make sure the fields we don't use are zeroed */ 994 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark))) 995 return -EINVAL; 996 997 /* mark is allowed */ 998 999 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark), 1000 offsetof(struct __sk_buff, priority))) 1001 return -EINVAL; 1002 1003 /* priority is allowed */ 1004 /* ingress_ifindex is allowed */ 1005 /* ifindex is allowed */ 1006 1007 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex), 1008 offsetof(struct __sk_buff, cb))) 1009 return -EINVAL; 1010 1011 /* cb is allowed */ 1012 1013 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb), 1014 offsetof(struct __sk_buff, tstamp))) 1015 return -EINVAL; 1016 1017 /* tstamp is allowed */ 1018 /* wire_len is allowed */ 1019 /* gso_segs is allowed */ 1020 1021 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs), 1022 offsetof(struct __sk_buff, gso_size))) 1023 return -EINVAL; 1024 1025 /* gso_size is allowed */ 1026 1027 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size), 1028 offsetof(struct __sk_buff, hwtstamp))) 1029 return -EINVAL; 1030 1031 /* hwtstamp is allowed */ 1032 1033 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, hwtstamp), 1034 sizeof(struct __sk_buff))) 1035 return -EINVAL; 1036 1037 skb->mark = __skb->mark; 1038 skb->priority = __skb->priority; 1039 skb->skb_iif = __skb->ingress_ifindex; 1040 skb->tstamp = __skb->tstamp; 1041 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN); 1042 1043 if (__skb->wire_len == 0) { 1044 cb->pkt_len = skb->len; 1045 } else { 1046 if (__skb->wire_len < skb->len || 1047 __skb->wire_len > GSO_LEGACY_MAX_SIZE) 1048 return -EINVAL; 1049 cb->pkt_len = __skb->wire_len; 1050 } 1051 1052 if (__skb->gso_segs > GSO_MAX_SEGS) 1053 return -EINVAL; 1054 skb_shinfo(skb)->gso_segs = __skb->gso_segs; 1055 skb_shinfo(skb)->gso_size = __skb->gso_size; 1056 skb_shinfo(skb)->hwtstamps.hwtstamp = __skb->hwtstamp; 1057 1058 return 0; 1059 } 1060 1061 static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb) 1062 { 1063 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; 1064 1065 if (!__skb) 1066 return; 1067 1068 __skb->mark = skb->mark; 1069 __skb->priority = skb->priority; 1070 __skb->ingress_ifindex = skb->skb_iif; 1071 __skb->ifindex = skb->dev->ifindex; 1072 __skb->tstamp = skb->tstamp; 1073 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN); 1074 __skb->wire_len = cb->pkt_len; 1075 __skb->gso_segs = skb_shinfo(skb)->gso_segs; 1076 __skb->hwtstamp = skb_shinfo(skb)->hwtstamps.hwtstamp; 1077 } 1078 1079 static struct proto bpf_dummy_proto = { 1080 .name = "bpf_dummy", 1081 .owner = THIS_MODULE, 1082 .obj_size = sizeof(struct sock), 1083 }; 1084 1085 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 1086 union bpf_attr __user *uattr) 1087 { 1088 bool is_l2 = false, is_direct_pkt_access = false; 1089 struct net *net = current->nsproxy->net_ns; 1090 struct net_device *dev = net->loopback_dev; 1091 u32 size = kattr->test.data_size_in; 1092 u32 repeat = kattr->test.repeat; 1093 struct __sk_buff *ctx = NULL; 1094 u32 retval, duration; 1095 int hh_len = ETH_HLEN; 1096 struct sk_buff *skb; 1097 struct sock *sk; 1098 void *data; 1099 int ret; 1100 1101 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size) 1102 return -EINVAL; 1103 1104 data = bpf_test_init(kattr, kattr->test.data_size_in, 1105 size, NET_SKB_PAD + NET_IP_ALIGN, 1106 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); 1107 if (IS_ERR(data)) 1108 return PTR_ERR(data); 1109 1110 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff)); 1111 if (IS_ERR(ctx)) { 1112 kfree(data); 1113 return PTR_ERR(ctx); 1114 } 1115 1116 switch (prog->type) { 1117 case BPF_PROG_TYPE_SCHED_CLS: 1118 case BPF_PROG_TYPE_SCHED_ACT: 1119 is_l2 = true; 1120 fallthrough; 1121 case BPF_PROG_TYPE_LWT_IN: 1122 case BPF_PROG_TYPE_LWT_OUT: 1123 case BPF_PROG_TYPE_LWT_XMIT: 1124 is_direct_pkt_access = true; 1125 break; 1126 default: 1127 break; 1128 } 1129 1130 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1); 1131 if (!sk) { 1132 kfree(data); 1133 kfree(ctx); 1134 return -ENOMEM; 1135 } 1136 sock_init_data(NULL, sk); 1137 1138 skb = slab_build_skb(data); 1139 if (!skb) { 1140 kfree(data); 1141 kfree(ctx); 1142 sk_free(sk); 1143 return -ENOMEM; 1144 } 1145 skb->sk = sk; 1146 1147 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); 1148 __skb_put(skb, size); 1149 if (ctx && ctx->ifindex > 1) { 1150 dev = dev_get_by_index(net, ctx->ifindex); 1151 if (!dev) { 1152 ret = -ENODEV; 1153 goto out; 1154 } 1155 } 1156 skb->protocol = eth_type_trans(skb, dev); 1157 skb_reset_network_header(skb); 1158 1159 switch (skb->protocol) { 1160 case htons(ETH_P_IP): 1161 sk->sk_family = AF_INET; 1162 if (sizeof(struct iphdr) <= skb_headlen(skb)) { 1163 sk->sk_rcv_saddr = ip_hdr(skb)->saddr; 1164 sk->sk_daddr = ip_hdr(skb)->daddr; 1165 } 1166 break; 1167 #if IS_ENABLED(CONFIG_IPV6) 1168 case htons(ETH_P_IPV6): 1169 sk->sk_family = AF_INET6; 1170 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) { 1171 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr; 1172 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr; 1173 } 1174 break; 1175 #endif 1176 default: 1177 break; 1178 } 1179 1180 if (is_l2) 1181 __skb_push(skb, hh_len); 1182 if (is_direct_pkt_access) 1183 bpf_compute_data_pointers(skb); 1184 ret = convert___skb_to_skb(skb, ctx); 1185 if (ret) 1186 goto out; 1187 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false); 1188 if (ret) 1189 goto out; 1190 if (!is_l2) { 1191 if (skb_headroom(skb) < hh_len) { 1192 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb)); 1193 1194 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) { 1195 ret = -ENOMEM; 1196 goto out; 1197 } 1198 } 1199 memset(__skb_push(skb, hh_len), 0, hh_len); 1200 } 1201 convert_skb_to___skb(skb, ctx); 1202 1203 size = skb->len; 1204 /* bpf program can never convert linear skb to non-linear */ 1205 if (WARN_ON_ONCE(skb_is_nonlinear(skb))) 1206 size = skb_headlen(skb); 1207 ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval, 1208 duration); 1209 if (!ret) 1210 ret = bpf_ctx_finish(kattr, uattr, ctx, 1211 sizeof(struct __sk_buff)); 1212 out: 1213 if (dev && dev != net->loopback_dev) 1214 dev_put(dev); 1215 kfree_skb(skb); 1216 sk_free(sk); 1217 kfree(ctx); 1218 return ret; 1219 } 1220 1221 static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp) 1222 { 1223 unsigned int ingress_ifindex, rx_queue_index; 1224 struct netdev_rx_queue *rxqueue; 1225 struct net_device *device; 1226 1227 if (!xdp_md) 1228 return 0; 1229 1230 if (xdp_md->egress_ifindex != 0) 1231 return -EINVAL; 1232 1233 ingress_ifindex = xdp_md->ingress_ifindex; 1234 rx_queue_index = xdp_md->rx_queue_index; 1235 1236 if (!ingress_ifindex && rx_queue_index) 1237 return -EINVAL; 1238 1239 if (ingress_ifindex) { 1240 device = dev_get_by_index(current->nsproxy->net_ns, 1241 ingress_ifindex); 1242 if (!device) 1243 return -ENODEV; 1244 1245 if (rx_queue_index >= device->real_num_rx_queues) 1246 goto free_dev; 1247 1248 rxqueue = __netif_get_rx_queue(device, rx_queue_index); 1249 1250 if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq)) 1251 goto free_dev; 1252 1253 xdp->rxq = &rxqueue->xdp_rxq; 1254 /* The device is now tracked in the xdp->rxq for later 1255 * dev_put() 1256 */ 1257 } 1258 1259 xdp->data = xdp->data_meta + xdp_md->data; 1260 return 0; 1261 1262 free_dev: 1263 dev_put(device); 1264 return -EINVAL; 1265 } 1266 1267 static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md) 1268 { 1269 if (!xdp_md) 1270 return; 1271 1272 xdp_md->data = xdp->data - xdp->data_meta; 1273 xdp_md->data_end = xdp->data_end - xdp->data_meta; 1274 1275 if (xdp_md->ingress_ifindex) 1276 dev_put(xdp->rxq->dev); 1277 } 1278 1279 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 1280 union bpf_attr __user *uattr) 1281 { 1282 bool do_live = (kattr->test.flags & BPF_F_TEST_XDP_LIVE_FRAMES); 1283 u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1284 u32 batch_size = kattr->test.batch_size; 1285 u32 retval = 0, duration, max_data_sz; 1286 u32 size = kattr->test.data_size_in; 1287 u32 headroom = XDP_PACKET_HEADROOM; 1288 u32 repeat = kattr->test.repeat; 1289 struct netdev_rx_queue *rxqueue; 1290 struct skb_shared_info *sinfo; 1291 struct xdp_buff xdp = {}; 1292 int i, ret = -EINVAL; 1293 struct xdp_md *ctx; 1294 void *data; 1295 1296 if (prog->expected_attach_type == BPF_XDP_DEVMAP || 1297 prog->expected_attach_type == BPF_XDP_CPUMAP) 1298 return -EINVAL; 1299 1300 if (kattr->test.flags & ~BPF_F_TEST_XDP_LIVE_FRAMES) 1301 return -EINVAL; 1302 1303 if (do_live) { 1304 if (!batch_size) 1305 batch_size = NAPI_POLL_WEIGHT; 1306 else if (batch_size > TEST_XDP_MAX_BATCH) 1307 return -E2BIG; 1308 1309 headroom += sizeof(struct xdp_page_head); 1310 } else if (batch_size) { 1311 return -EINVAL; 1312 } 1313 1314 ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md)); 1315 if (IS_ERR(ctx)) 1316 return PTR_ERR(ctx); 1317 1318 if (ctx) { 1319 /* There can't be user provided data before the meta data */ 1320 if (ctx->data_meta || ctx->data_end != size || 1321 ctx->data > ctx->data_end || 1322 unlikely(xdp_metalen_invalid(ctx->data)) || 1323 (do_live && (kattr->test.data_out || kattr->test.ctx_out))) 1324 goto free_ctx; 1325 /* Meta data is allocated from the headroom */ 1326 headroom -= ctx->data; 1327 } 1328 1329 max_data_sz = 4096 - headroom - tailroom; 1330 if (size > max_data_sz) { 1331 /* disallow live data mode for jumbo frames */ 1332 if (do_live) 1333 goto free_ctx; 1334 size = max_data_sz; 1335 } 1336 1337 data = bpf_test_init(kattr, size, max_data_sz, headroom, tailroom); 1338 if (IS_ERR(data)) { 1339 ret = PTR_ERR(data); 1340 goto free_ctx; 1341 } 1342 1343 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0); 1344 rxqueue->xdp_rxq.frag_size = headroom + max_data_sz + tailroom; 1345 xdp_init_buff(&xdp, rxqueue->xdp_rxq.frag_size, &rxqueue->xdp_rxq); 1346 xdp_prepare_buff(&xdp, data, headroom, size, true); 1347 sinfo = xdp_get_shared_info_from_buff(&xdp); 1348 1349 ret = xdp_convert_md_to_buff(ctx, &xdp); 1350 if (ret) 1351 goto free_data; 1352 1353 if (unlikely(kattr->test.data_size_in > size)) { 1354 void __user *data_in = u64_to_user_ptr(kattr->test.data_in); 1355 1356 while (size < kattr->test.data_size_in) { 1357 struct page *page; 1358 skb_frag_t *frag; 1359 u32 data_len; 1360 1361 if (sinfo->nr_frags == MAX_SKB_FRAGS) { 1362 ret = -ENOMEM; 1363 goto out; 1364 } 1365 1366 page = alloc_page(GFP_KERNEL); 1367 if (!page) { 1368 ret = -ENOMEM; 1369 goto out; 1370 } 1371 1372 frag = &sinfo->frags[sinfo->nr_frags++]; 1373 __skb_frag_set_page(frag, page); 1374 1375 data_len = min_t(u32, kattr->test.data_size_in - size, 1376 PAGE_SIZE); 1377 skb_frag_size_set(frag, data_len); 1378 1379 if (copy_from_user(page_address(page), data_in + size, 1380 data_len)) { 1381 ret = -EFAULT; 1382 goto out; 1383 } 1384 sinfo->xdp_frags_size += data_len; 1385 size += data_len; 1386 } 1387 xdp_buff_set_frags_flag(&xdp); 1388 } 1389 1390 if (repeat > 1) 1391 bpf_prog_change_xdp(NULL, prog); 1392 1393 if (do_live) 1394 ret = bpf_test_run_xdp_live(prog, &xdp, repeat, batch_size, &duration); 1395 else 1396 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true); 1397 /* We convert the xdp_buff back to an xdp_md before checking the return 1398 * code so the reference count of any held netdevice will be decremented 1399 * even if the test run failed. 1400 */ 1401 xdp_convert_buff_to_md(&xdp, ctx); 1402 if (ret) 1403 goto out; 1404 1405 size = xdp.data_end - xdp.data_meta + sinfo->xdp_frags_size; 1406 ret = bpf_test_finish(kattr, uattr, xdp.data_meta, sinfo, size, 1407 retval, duration); 1408 if (!ret) 1409 ret = bpf_ctx_finish(kattr, uattr, ctx, 1410 sizeof(struct xdp_md)); 1411 1412 out: 1413 if (repeat > 1) 1414 bpf_prog_change_xdp(prog, NULL); 1415 free_data: 1416 for (i = 0; i < sinfo->nr_frags; i++) 1417 __free_page(skb_frag_page(&sinfo->frags[i])); 1418 kfree(data); 1419 free_ctx: 1420 kfree(ctx); 1421 return ret; 1422 } 1423 1424 static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx) 1425 { 1426 /* make sure the fields we don't use are zeroed */ 1427 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags))) 1428 return -EINVAL; 1429 1430 /* flags is allowed */ 1431 1432 if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags), 1433 sizeof(struct bpf_flow_keys))) 1434 return -EINVAL; 1435 1436 return 0; 1437 } 1438 1439 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1440 const union bpf_attr *kattr, 1441 union bpf_attr __user *uattr) 1442 { 1443 struct bpf_test_timer t = { NO_PREEMPT }; 1444 u32 size = kattr->test.data_size_in; 1445 struct bpf_flow_dissector ctx = {}; 1446 u32 repeat = kattr->test.repeat; 1447 struct bpf_flow_keys *user_ctx; 1448 struct bpf_flow_keys flow_keys; 1449 const struct ethhdr *eth; 1450 unsigned int flags = 0; 1451 u32 retval, duration; 1452 void *data; 1453 int ret; 1454 1455 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size) 1456 return -EINVAL; 1457 1458 if (size < ETH_HLEN) 1459 return -EINVAL; 1460 1461 data = bpf_test_init(kattr, kattr->test.data_size_in, size, 0, 0); 1462 if (IS_ERR(data)) 1463 return PTR_ERR(data); 1464 1465 eth = (struct ethhdr *)data; 1466 1467 if (!repeat) 1468 repeat = 1; 1469 1470 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys)); 1471 if (IS_ERR(user_ctx)) { 1472 kfree(data); 1473 return PTR_ERR(user_ctx); 1474 } 1475 if (user_ctx) { 1476 ret = verify_user_bpf_flow_keys(user_ctx); 1477 if (ret) 1478 goto out; 1479 flags = user_ctx->flags; 1480 } 1481 1482 ctx.flow_keys = &flow_keys; 1483 ctx.data = data; 1484 ctx.data_end = (__u8 *)data + size; 1485 1486 bpf_test_timer_enter(&t); 1487 do { 1488 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN, 1489 size, flags); 1490 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration)); 1491 bpf_test_timer_leave(&t); 1492 1493 if (ret < 0) 1494 goto out; 1495 1496 ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL, 1497 sizeof(flow_keys), retval, duration); 1498 if (!ret) 1499 ret = bpf_ctx_finish(kattr, uattr, user_ctx, 1500 sizeof(struct bpf_flow_keys)); 1501 1502 out: 1503 kfree(user_ctx); 1504 kfree(data); 1505 return ret; 1506 } 1507 1508 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr, 1509 union bpf_attr __user *uattr) 1510 { 1511 struct bpf_test_timer t = { NO_PREEMPT }; 1512 struct bpf_prog_array *progs = NULL; 1513 struct bpf_sk_lookup_kern ctx = {}; 1514 u32 repeat = kattr->test.repeat; 1515 struct bpf_sk_lookup *user_ctx; 1516 u32 retval, duration; 1517 int ret = -EINVAL; 1518 1519 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size) 1520 return -EINVAL; 1521 1522 if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out || 1523 kattr->test.data_size_out) 1524 return -EINVAL; 1525 1526 if (!repeat) 1527 repeat = 1; 1528 1529 user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx)); 1530 if (IS_ERR(user_ctx)) 1531 return PTR_ERR(user_ctx); 1532 1533 if (!user_ctx) 1534 return -EINVAL; 1535 1536 if (user_ctx->sk) 1537 goto out; 1538 1539 if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx))) 1540 goto out; 1541 1542 if (user_ctx->local_port > U16_MAX) { 1543 ret = -ERANGE; 1544 goto out; 1545 } 1546 1547 ctx.family = (u16)user_ctx->family; 1548 ctx.protocol = (u16)user_ctx->protocol; 1549 ctx.dport = (u16)user_ctx->local_port; 1550 ctx.sport = user_ctx->remote_port; 1551 1552 switch (ctx.family) { 1553 case AF_INET: 1554 ctx.v4.daddr = (__force __be32)user_ctx->local_ip4; 1555 ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4; 1556 break; 1557 1558 #if IS_ENABLED(CONFIG_IPV6) 1559 case AF_INET6: 1560 ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6; 1561 ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6; 1562 break; 1563 #endif 1564 1565 default: 1566 ret = -EAFNOSUPPORT; 1567 goto out; 1568 } 1569 1570 progs = bpf_prog_array_alloc(1, GFP_KERNEL); 1571 if (!progs) { 1572 ret = -ENOMEM; 1573 goto out; 1574 } 1575 1576 progs->items[0].prog = prog; 1577 1578 bpf_test_timer_enter(&t); 1579 do { 1580 ctx.selected_sk = NULL; 1581 retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run); 1582 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration)); 1583 bpf_test_timer_leave(&t); 1584 1585 if (ret < 0) 1586 goto out; 1587 1588 user_ctx->cookie = 0; 1589 if (ctx.selected_sk) { 1590 if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) { 1591 ret = -EOPNOTSUPP; 1592 goto out; 1593 } 1594 1595 user_ctx->cookie = sock_gen_cookie(ctx.selected_sk); 1596 } 1597 1598 ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration); 1599 if (!ret) 1600 ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx)); 1601 1602 out: 1603 bpf_prog_array_free(progs); 1604 kfree(user_ctx); 1605 return ret; 1606 } 1607 1608 int bpf_prog_test_run_syscall(struct bpf_prog *prog, 1609 const union bpf_attr *kattr, 1610 union bpf_attr __user *uattr) 1611 { 1612 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); 1613 __u32 ctx_size_in = kattr->test.ctx_size_in; 1614 void *ctx = NULL; 1615 u32 retval; 1616 int err = 0; 1617 1618 /* doesn't support data_in/out, ctx_out, duration, or repeat or flags */ 1619 if (kattr->test.data_in || kattr->test.data_out || 1620 kattr->test.ctx_out || kattr->test.duration || 1621 kattr->test.repeat || kattr->test.flags || 1622 kattr->test.batch_size) 1623 return -EINVAL; 1624 1625 if (ctx_size_in < prog->aux->max_ctx_offset || 1626 ctx_size_in > U16_MAX) 1627 return -EINVAL; 1628 1629 if (ctx_size_in) { 1630 ctx = memdup_user(ctx_in, ctx_size_in); 1631 if (IS_ERR(ctx)) 1632 return PTR_ERR(ctx); 1633 } 1634 1635 rcu_read_lock_trace(); 1636 retval = bpf_prog_run_pin_on_cpu(prog, ctx); 1637 rcu_read_unlock_trace(); 1638 1639 if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) { 1640 err = -EFAULT; 1641 goto out; 1642 } 1643 if (ctx_size_in) 1644 if (copy_to_user(ctx_in, ctx, ctx_size_in)) 1645 err = -EFAULT; 1646 out: 1647 kfree(ctx); 1648 return err; 1649 } 1650 1651 static const struct btf_kfunc_id_set bpf_prog_test_kfunc_set = { 1652 .owner = THIS_MODULE, 1653 .set = &test_sk_check_kfunc_ids, 1654 }; 1655 1656 BTF_ID_LIST(bpf_prog_test_dtor_kfunc_ids) 1657 BTF_ID(struct, prog_test_ref_kfunc) 1658 BTF_ID(func, bpf_kfunc_call_test_release) 1659 BTF_ID(struct, prog_test_member) 1660 BTF_ID(func, bpf_kfunc_call_memb_release) 1661 1662 static int __init bpf_prog_test_run_init(void) 1663 { 1664 const struct btf_id_dtor_kfunc bpf_prog_test_dtor_kfunc[] = { 1665 { 1666 .btf_id = bpf_prog_test_dtor_kfunc_ids[0], 1667 .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[1] 1668 }, 1669 { 1670 .btf_id = bpf_prog_test_dtor_kfunc_ids[2], 1671 .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[3], 1672 }, 1673 }; 1674 int ret; 1675 1676 ret = register_btf_fmodret_id_set(&bpf_test_modify_return_set); 1677 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set); 1678 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set); 1679 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set); 1680 return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc, 1681 ARRAY_SIZE(bpf_prog_test_dtor_kfunc), 1682 THIS_MODULE); 1683 } 1684 late_initcall(bpf_prog_test_run_init); 1685