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 data = kzalloc(size + headroom + tailroom, GFP_USER); 785 if (!data) 786 return ERR_PTR(-ENOMEM); 787 788 if (copy_from_user(data + headroom, data_in, user_size)) { 789 kfree(data); 790 return ERR_PTR(-EFAULT); 791 } 792 793 return data; 794 } 795 796 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 797 const union bpf_attr *kattr, 798 union bpf_attr __user *uattr) 799 { 800 struct bpf_fentry_test_t arg = {}; 801 u16 side_effect = 0, ret = 0; 802 int b = 2, err = -EFAULT; 803 u32 retval = 0; 804 805 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size) 806 return -EINVAL; 807 808 switch (prog->expected_attach_type) { 809 case BPF_TRACE_FENTRY: 810 case BPF_TRACE_FEXIT: 811 if (bpf_fentry_test1(1) != 2 || 812 bpf_fentry_test2(2, 3) != 5 || 813 bpf_fentry_test3(4, 5, 6) != 15 || 814 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 || 815 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 || 816 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 || 817 bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 || 818 bpf_fentry_test8(&arg) != 0) 819 goto out; 820 break; 821 case BPF_MODIFY_RETURN: 822 ret = bpf_modify_return_test(1, &b); 823 if (b != 2) 824 side_effect = 1; 825 break; 826 default: 827 goto out; 828 } 829 830 retval = ((u32)side_effect << 16) | ret; 831 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval))) 832 goto out; 833 834 err = 0; 835 out: 836 trace_bpf_test_finish(&err); 837 return err; 838 } 839 840 struct bpf_raw_tp_test_run_info { 841 struct bpf_prog *prog; 842 void *ctx; 843 u32 retval; 844 }; 845 846 static void 847 __bpf_prog_test_run_raw_tp(void *data) 848 { 849 struct bpf_raw_tp_test_run_info *info = data; 850 851 rcu_read_lock(); 852 info->retval = bpf_prog_run(info->prog, info->ctx); 853 rcu_read_unlock(); 854 } 855 856 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 857 const union bpf_attr *kattr, 858 union bpf_attr __user *uattr) 859 { 860 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); 861 __u32 ctx_size_in = kattr->test.ctx_size_in; 862 struct bpf_raw_tp_test_run_info info; 863 int cpu = kattr->test.cpu, err = 0; 864 int current_cpu; 865 866 /* doesn't support data_in/out, ctx_out, duration, or repeat */ 867 if (kattr->test.data_in || kattr->test.data_out || 868 kattr->test.ctx_out || kattr->test.duration || 869 kattr->test.repeat || kattr->test.batch_size) 870 return -EINVAL; 871 872 if (ctx_size_in < prog->aux->max_ctx_offset || 873 ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64)) 874 return -EINVAL; 875 876 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0) 877 return -EINVAL; 878 879 if (ctx_size_in) { 880 info.ctx = memdup_user(ctx_in, ctx_size_in); 881 if (IS_ERR(info.ctx)) 882 return PTR_ERR(info.ctx); 883 } else { 884 info.ctx = NULL; 885 } 886 887 info.prog = prog; 888 889 current_cpu = get_cpu(); 890 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 || 891 cpu == current_cpu) { 892 __bpf_prog_test_run_raw_tp(&info); 893 } else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) { 894 /* smp_call_function_single() also checks cpu_online() 895 * after csd_lock(). However, since cpu is from user 896 * space, let's do an extra quick check to filter out 897 * invalid value before smp_call_function_single(). 898 */ 899 err = -ENXIO; 900 } else { 901 err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp, 902 &info, 1); 903 } 904 put_cpu(); 905 906 if (!err && 907 copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32))) 908 err = -EFAULT; 909 910 kfree(info.ctx); 911 return err; 912 } 913 914 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size) 915 { 916 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in); 917 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out); 918 u32 size = kattr->test.ctx_size_in; 919 void *data; 920 int err; 921 922 if (!data_in && !data_out) 923 return NULL; 924 925 data = kzalloc(max_size, GFP_USER); 926 if (!data) 927 return ERR_PTR(-ENOMEM); 928 929 if (data_in) { 930 err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size); 931 if (err) { 932 kfree(data); 933 return ERR_PTR(err); 934 } 935 936 size = min_t(u32, max_size, size); 937 if (copy_from_user(data, data_in, size)) { 938 kfree(data); 939 return ERR_PTR(-EFAULT); 940 } 941 } 942 return data; 943 } 944 945 static int bpf_ctx_finish(const union bpf_attr *kattr, 946 union bpf_attr __user *uattr, const void *data, 947 u32 size) 948 { 949 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out); 950 int err = -EFAULT; 951 u32 copy_size = size; 952 953 if (!data || !data_out) 954 return 0; 955 956 if (copy_size > kattr->test.ctx_size_out) { 957 copy_size = kattr->test.ctx_size_out; 958 err = -ENOSPC; 959 } 960 961 if (copy_to_user(data_out, data, copy_size)) 962 goto out; 963 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size))) 964 goto out; 965 if (err != -ENOSPC) 966 err = 0; 967 out: 968 return err; 969 } 970 971 /** 972 * range_is_zero - test whether buffer is initialized 973 * @buf: buffer to check 974 * @from: check from this position 975 * @to: check up until (excluding) this position 976 * 977 * This function returns true if the there is a non-zero byte 978 * in the buf in the range [from,to). 979 */ 980 static inline bool range_is_zero(void *buf, size_t from, size_t to) 981 { 982 return !memchr_inv((u8 *)buf + from, 0, to - from); 983 } 984 985 static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb) 986 { 987 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; 988 989 if (!skb->len) 990 return -EINVAL; 991 992 if (!__skb) 993 return 0; 994 995 /* make sure the fields we don't use are zeroed */ 996 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark))) 997 return -EINVAL; 998 999 /* mark is allowed */ 1000 1001 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark), 1002 offsetof(struct __sk_buff, priority))) 1003 return -EINVAL; 1004 1005 /* priority is allowed */ 1006 /* ingress_ifindex is allowed */ 1007 /* ifindex is allowed */ 1008 1009 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex), 1010 offsetof(struct __sk_buff, cb))) 1011 return -EINVAL; 1012 1013 /* cb is allowed */ 1014 1015 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb), 1016 offsetof(struct __sk_buff, tstamp))) 1017 return -EINVAL; 1018 1019 /* tstamp is allowed */ 1020 /* wire_len is allowed */ 1021 /* gso_segs is allowed */ 1022 1023 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs), 1024 offsetof(struct __sk_buff, gso_size))) 1025 return -EINVAL; 1026 1027 /* gso_size is allowed */ 1028 1029 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size), 1030 offsetof(struct __sk_buff, hwtstamp))) 1031 return -EINVAL; 1032 1033 /* hwtstamp is allowed */ 1034 1035 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, hwtstamp), 1036 sizeof(struct __sk_buff))) 1037 return -EINVAL; 1038 1039 skb->mark = __skb->mark; 1040 skb->priority = __skb->priority; 1041 skb->skb_iif = __skb->ingress_ifindex; 1042 skb->tstamp = __skb->tstamp; 1043 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN); 1044 1045 if (__skb->wire_len == 0) { 1046 cb->pkt_len = skb->len; 1047 } else { 1048 if (__skb->wire_len < skb->len || 1049 __skb->wire_len > GSO_LEGACY_MAX_SIZE) 1050 return -EINVAL; 1051 cb->pkt_len = __skb->wire_len; 1052 } 1053 1054 if (__skb->gso_segs > GSO_MAX_SEGS) 1055 return -EINVAL; 1056 skb_shinfo(skb)->gso_segs = __skb->gso_segs; 1057 skb_shinfo(skb)->gso_size = __skb->gso_size; 1058 skb_shinfo(skb)->hwtstamps.hwtstamp = __skb->hwtstamp; 1059 1060 return 0; 1061 } 1062 1063 static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb) 1064 { 1065 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; 1066 1067 if (!__skb) 1068 return; 1069 1070 __skb->mark = skb->mark; 1071 __skb->priority = skb->priority; 1072 __skb->ingress_ifindex = skb->skb_iif; 1073 __skb->ifindex = skb->dev->ifindex; 1074 __skb->tstamp = skb->tstamp; 1075 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN); 1076 __skb->wire_len = cb->pkt_len; 1077 __skb->gso_segs = skb_shinfo(skb)->gso_segs; 1078 __skb->hwtstamp = skb_shinfo(skb)->hwtstamps.hwtstamp; 1079 } 1080 1081 static struct proto bpf_dummy_proto = { 1082 .name = "bpf_dummy", 1083 .owner = THIS_MODULE, 1084 .obj_size = sizeof(struct sock), 1085 }; 1086 1087 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 1088 union bpf_attr __user *uattr) 1089 { 1090 bool is_l2 = false, is_direct_pkt_access = false; 1091 struct net *net = current->nsproxy->net_ns; 1092 struct net_device *dev = net->loopback_dev; 1093 u32 size = kattr->test.data_size_in; 1094 u32 repeat = kattr->test.repeat; 1095 struct __sk_buff *ctx = NULL; 1096 u32 retval, duration; 1097 int hh_len = ETH_HLEN; 1098 struct sk_buff *skb; 1099 struct sock *sk; 1100 void *data; 1101 int ret; 1102 1103 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size) 1104 return -EINVAL; 1105 1106 data = bpf_test_init(kattr, kattr->test.data_size_in, 1107 size, NET_SKB_PAD + NET_IP_ALIGN, 1108 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); 1109 if (IS_ERR(data)) 1110 return PTR_ERR(data); 1111 1112 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff)); 1113 if (IS_ERR(ctx)) { 1114 kfree(data); 1115 return PTR_ERR(ctx); 1116 } 1117 1118 switch (prog->type) { 1119 case BPF_PROG_TYPE_SCHED_CLS: 1120 case BPF_PROG_TYPE_SCHED_ACT: 1121 is_l2 = true; 1122 fallthrough; 1123 case BPF_PROG_TYPE_LWT_IN: 1124 case BPF_PROG_TYPE_LWT_OUT: 1125 case BPF_PROG_TYPE_LWT_XMIT: 1126 is_direct_pkt_access = true; 1127 break; 1128 default: 1129 break; 1130 } 1131 1132 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1); 1133 if (!sk) { 1134 kfree(data); 1135 kfree(ctx); 1136 return -ENOMEM; 1137 } 1138 sock_init_data(NULL, sk); 1139 1140 skb = build_skb(data, 0); 1141 if (!skb) { 1142 kfree(data); 1143 kfree(ctx); 1144 sk_free(sk); 1145 return -ENOMEM; 1146 } 1147 skb->sk = sk; 1148 1149 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); 1150 __skb_put(skb, size); 1151 if (ctx && ctx->ifindex > 1) { 1152 dev = dev_get_by_index(net, ctx->ifindex); 1153 if (!dev) { 1154 ret = -ENODEV; 1155 goto out; 1156 } 1157 } 1158 skb->protocol = eth_type_trans(skb, dev); 1159 skb_reset_network_header(skb); 1160 1161 switch (skb->protocol) { 1162 case htons(ETH_P_IP): 1163 sk->sk_family = AF_INET; 1164 if (sizeof(struct iphdr) <= skb_headlen(skb)) { 1165 sk->sk_rcv_saddr = ip_hdr(skb)->saddr; 1166 sk->sk_daddr = ip_hdr(skb)->daddr; 1167 } 1168 break; 1169 #if IS_ENABLED(CONFIG_IPV6) 1170 case htons(ETH_P_IPV6): 1171 sk->sk_family = AF_INET6; 1172 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) { 1173 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr; 1174 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr; 1175 } 1176 break; 1177 #endif 1178 default: 1179 break; 1180 } 1181 1182 if (is_l2) 1183 __skb_push(skb, hh_len); 1184 if (is_direct_pkt_access) 1185 bpf_compute_data_pointers(skb); 1186 ret = convert___skb_to_skb(skb, ctx); 1187 if (ret) 1188 goto out; 1189 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false); 1190 if (ret) 1191 goto out; 1192 if (!is_l2) { 1193 if (skb_headroom(skb) < hh_len) { 1194 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb)); 1195 1196 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) { 1197 ret = -ENOMEM; 1198 goto out; 1199 } 1200 } 1201 memset(__skb_push(skb, hh_len), 0, hh_len); 1202 } 1203 convert_skb_to___skb(skb, ctx); 1204 1205 size = skb->len; 1206 /* bpf program can never convert linear skb to non-linear */ 1207 if (WARN_ON_ONCE(skb_is_nonlinear(skb))) 1208 size = skb_headlen(skb); 1209 ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval, 1210 duration); 1211 if (!ret) 1212 ret = bpf_ctx_finish(kattr, uattr, ctx, 1213 sizeof(struct __sk_buff)); 1214 out: 1215 if (dev && dev != net->loopback_dev) 1216 dev_put(dev); 1217 kfree_skb(skb); 1218 sk_free(sk); 1219 kfree(ctx); 1220 return ret; 1221 } 1222 1223 static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp) 1224 { 1225 unsigned int ingress_ifindex, rx_queue_index; 1226 struct netdev_rx_queue *rxqueue; 1227 struct net_device *device; 1228 1229 if (!xdp_md) 1230 return 0; 1231 1232 if (xdp_md->egress_ifindex != 0) 1233 return -EINVAL; 1234 1235 ingress_ifindex = xdp_md->ingress_ifindex; 1236 rx_queue_index = xdp_md->rx_queue_index; 1237 1238 if (!ingress_ifindex && rx_queue_index) 1239 return -EINVAL; 1240 1241 if (ingress_ifindex) { 1242 device = dev_get_by_index(current->nsproxy->net_ns, 1243 ingress_ifindex); 1244 if (!device) 1245 return -ENODEV; 1246 1247 if (rx_queue_index >= device->real_num_rx_queues) 1248 goto free_dev; 1249 1250 rxqueue = __netif_get_rx_queue(device, rx_queue_index); 1251 1252 if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq)) 1253 goto free_dev; 1254 1255 xdp->rxq = &rxqueue->xdp_rxq; 1256 /* The device is now tracked in the xdp->rxq for later 1257 * dev_put() 1258 */ 1259 } 1260 1261 xdp->data = xdp->data_meta + xdp_md->data; 1262 return 0; 1263 1264 free_dev: 1265 dev_put(device); 1266 return -EINVAL; 1267 } 1268 1269 static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md) 1270 { 1271 if (!xdp_md) 1272 return; 1273 1274 xdp_md->data = xdp->data - xdp->data_meta; 1275 xdp_md->data_end = xdp->data_end - xdp->data_meta; 1276 1277 if (xdp_md->ingress_ifindex) 1278 dev_put(xdp->rxq->dev); 1279 } 1280 1281 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 1282 union bpf_attr __user *uattr) 1283 { 1284 bool do_live = (kattr->test.flags & BPF_F_TEST_XDP_LIVE_FRAMES); 1285 u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 1286 u32 batch_size = kattr->test.batch_size; 1287 u32 retval = 0, duration, max_data_sz; 1288 u32 size = kattr->test.data_size_in; 1289 u32 headroom = XDP_PACKET_HEADROOM; 1290 u32 repeat = kattr->test.repeat; 1291 struct netdev_rx_queue *rxqueue; 1292 struct skb_shared_info *sinfo; 1293 struct xdp_buff xdp = {}; 1294 int i, ret = -EINVAL; 1295 struct xdp_md *ctx; 1296 void *data; 1297 1298 if (prog->expected_attach_type == BPF_XDP_DEVMAP || 1299 prog->expected_attach_type == BPF_XDP_CPUMAP) 1300 return -EINVAL; 1301 1302 if (kattr->test.flags & ~BPF_F_TEST_XDP_LIVE_FRAMES) 1303 return -EINVAL; 1304 1305 if (do_live) { 1306 if (!batch_size) 1307 batch_size = NAPI_POLL_WEIGHT; 1308 else if (batch_size > TEST_XDP_MAX_BATCH) 1309 return -E2BIG; 1310 1311 headroom += sizeof(struct xdp_page_head); 1312 } else if (batch_size) { 1313 return -EINVAL; 1314 } 1315 1316 ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md)); 1317 if (IS_ERR(ctx)) 1318 return PTR_ERR(ctx); 1319 1320 if (ctx) { 1321 /* There can't be user provided data before the meta data */ 1322 if (ctx->data_meta || ctx->data_end != size || 1323 ctx->data > ctx->data_end || 1324 unlikely(xdp_metalen_invalid(ctx->data)) || 1325 (do_live && (kattr->test.data_out || kattr->test.ctx_out))) 1326 goto free_ctx; 1327 /* Meta data is allocated from the headroom */ 1328 headroom -= ctx->data; 1329 } 1330 1331 max_data_sz = 4096 - headroom - tailroom; 1332 if (size > max_data_sz) { 1333 /* disallow live data mode for jumbo frames */ 1334 if (do_live) 1335 goto free_ctx; 1336 size = max_data_sz; 1337 } 1338 1339 data = bpf_test_init(kattr, size, max_data_sz, headroom, tailroom); 1340 if (IS_ERR(data)) { 1341 ret = PTR_ERR(data); 1342 goto free_ctx; 1343 } 1344 1345 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0); 1346 rxqueue->xdp_rxq.frag_size = headroom + max_data_sz + tailroom; 1347 xdp_init_buff(&xdp, rxqueue->xdp_rxq.frag_size, &rxqueue->xdp_rxq); 1348 xdp_prepare_buff(&xdp, data, headroom, size, true); 1349 sinfo = xdp_get_shared_info_from_buff(&xdp); 1350 1351 ret = xdp_convert_md_to_buff(ctx, &xdp); 1352 if (ret) 1353 goto free_data; 1354 1355 if (unlikely(kattr->test.data_size_in > size)) { 1356 void __user *data_in = u64_to_user_ptr(kattr->test.data_in); 1357 1358 while (size < kattr->test.data_size_in) { 1359 struct page *page; 1360 skb_frag_t *frag; 1361 u32 data_len; 1362 1363 if (sinfo->nr_frags == MAX_SKB_FRAGS) { 1364 ret = -ENOMEM; 1365 goto out; 1366 } 1367 1368 page = alloc_page(GFP_KERNEL); 1369 if (!page) { 1370 ret = -ENOMEM; 1371 goto out; 1372 } 1373 1374 frag = &sinfo->frags[sinfo->nr_frags++]; 1375 __skb_frag_set_page(frag, page); 1376 1377 data_len = min_t(u32, kattr->test.data_size_in - size, 1378 PAGE_SIZE); 1379 skb_frag_size_set(frag, data_len); 1380 1381 if (copy_from_user(page_address(page), data_in + size, 1382 data_len)) { 1383 ret = -EFAULT; 1384 goto out; 1385 } 1386 sinfo->xdp_frags_size += data_len; 1387 size += data_len; 1388 } 1389 xdp_buff_set_frags_flag(&xdp); 1390 } 1391 1392 if (repeat > 1) 1393 bpf_prog_change_xdp(NULL, prog); 1394 1395 if (do_live) 1396 ret = bpf_test_run_xdp_live(prog, &xdp, repeat, batch_size, &duration); 1397 else 1398 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true); 1399 /* We convert the xdp_buff back to an xdp_md before checking the return 1400 * code so the reference count of any held netdevice will be decremented 1401 * even if the test run failed. 1402 */ 1403 xdp_convert_buff_to_md(&xdp, ctx); 1404 if (ret) 1405 goto out; 1406 1407 size = xdp.data_end - xdp.data_meta + sinfo->xdp_frags_size; 1408 ret = bpf_test_finish(kattr, uattr, xdp.data_meta, sinfo, size, 1409 retval, duration); 1410 if (!ret) 1411 ret = bpf_ctx_finish(kattr, uattr, ctx, 1412 sizeof(struct xdp_md)); 1413 1414 out: 1415 if (repeat > 1) 1416 bpf_prog_change_xdp(prog, NULL); 1417 free_data: 1418 for (i = 0; i < sinfo->nr_frags; i++) 1419 __free_page(skb_frag_page(&sinfo->frags[i])); 1420 kfree(data); 1421 free_ctx: 1422 kfree(ctx); 1423 return ret; 1424 } 1425 1426 static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx) 1427 { 1428 /* make sure the fields we don't use are zeroed */ 1429 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags))) 1430 return -EINVAL; 1431 1432 /* flags is allowed */ 1433 1434 if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags), 1435 sizeof(struct bpf_flow_keys))) 1436 return -EINVAL; 1437 1438 return 0; 1439 } 1440 1441 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 1442 const union bpf_attr *kattr, 1443 union bpf_attr __user *uattr) 1444 { 1445 struct bpf_test_timer t = { NO_PREEMPT }; 1446 u32 size = kattr->test.data_size_in; 1447 struct bpf_flow_dissector ctx = {}; 1448 u32 repeat = kattr->test.repeat; 1449 struct bpf_flow_keys *user_ctx; 1450 struct bpf_flow_keys flow_keys; 1451 const struct ethhdr *eth; 1452 unsigned int flags = 0; 1453 u32 retval, duration; 1454 void *data; 1455 int ret; 1456 1457 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size) 1458 return -EINVAL; 1459 1460 if (size < ETH_HLEN) 1461 return -EINVAL; 1462 1463 data = bpf_test_init(kattr, kattr->test.data_size_in, size, 0, 0); 1464 if (IS_ERR(data)) 1465 return PTR_ERR(data); 1466 1467 eth = (struct ethhdr *)data; 1468 1469 if (!repeat) 1470 repeat = 1; 1471 1472 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys)); 1473 if (IS_ERR(user_ctx)) { 1474 kfree(data); 1475 return PTR_ERR(user_ctx); 1476 } 1477 if (user_ctx) { 1478 ret = verify_user_bpf_flow_keys(user_ctx); 1479 if (ret) 1480 goto out; 1481 flags = user_ctx->flags; 1482 } 1483 1484 ctx.flow_keys = &flow_keys; 1485 ctx.data = data; 1486 ctx.data_end = (__u8 *)data + size; 1487 1488 bpf_test_timer_enter(&t); 1489 do { 1490 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN, 1491 size, flags); 1492 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration)); 1493 bpf_test_timer_leave(&t); 1494 1495 if (ret < 0) 1496 goto out; 1497 1498 ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL, 1499 sizeof(flow_keys), retval, duration); 1500 if (!ret) 1501 ret = bpf_ctx_finish(kattr, uattr, user_ctx, 1502 sizeof(struct bpf_flow_keys)); 1503 1504 out: 1505 kfree(user_ctx); 1506 kfree(data); 1507 return ret; 1508 } 1509 1510 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr, 1511 union bpf_attr __user *uattr) 1512 { 1513 struct bpf_test_timer t = { NO_PREEMPT }; 1514 struct bpf_prog_array *progs = NULL; 1515 struct bpf_sk_lookup_kern ctx = {}; 1516 u32 repeat = kattr->test.repeat; 1517 struct bpf_sk_lookup *user_ctx; 1518 u32 retval, duration; 1519 int ret = -EINVAL; 1520 1521 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size) 1522 return -EINVAL; 1523 1524 if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out || 1525 kattr->test.data_size_out) 1526 return -EINVAL; 1527 1528 if (!repeat) 1529 repeat = 1; 1530 1531 user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx)); 1532 if (IS_ERR(user_ctx)) 1533 return PTR_ERR(user_ctx); 1534 1535 if (!user_ctx) 1536 return -EINVAL; 1537 1538 if (user_ctx->sk) 1539 goto out; 1540 1541 if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx))) 1542 goto out; 1543 1544 if (user_ctx->local_port > U16_MAX) { 1545 ret = -ERANGE; 1546 goto out; 1547 } 1548 1549 ctx.family = (u16)user_ctx->family; 1550 ctx.protocol = (u16)user_ctx->protocol; 1551 ctx.dport = (u16)user_ctx->local_port; 1552 ctx.sport = user_ctx->remote_port; 1553 1554 switch (ctx.family) { 1555 case AF_INET: 1556 ctx.v4.daddr = (__force __be32)user_ctx->local_ip4; 1557 ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4; 1558 break; 1559 1560 #if IS_ENABLED(CONFIG_IPV6) 1561 case AF_INET6: 1562 ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6; 1563 ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6; 1564 break; 1565 #endif 1566 1567 default: 1568 ret = -EAFNOSUPPORT; 1569 goto out; 1570 } 1571 1572 progs = bpf_prog_array_alloc(1, GFP_KERNEL); 1573 if (!progs) { 1574 ret = -ENOMEM; 1575 goto out; 1576 } 1577 1578 progs->items[0].prog = prog; 1579 1580 bpf_test_timer_enter(&t); 1581 do { 1582 ctx.selected_sk = NULL; 1583 retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run); 1584 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration)); 1585 bpf_test_timer_leave(&t); 1586 1587 if (ret < 0) 1588 goto out; 1589 1590 user_ctx->cookie = 0; 1591 if (ctx.selected_sk) { 1592 if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) { 1593 ret = -EOPNOTSUPP; 1594 goto out; 1595 } 1596 1597 user_ctx->cookie = sock_gen_cookie(ctx.selected_sk); 1598 } 1599 1600 ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration); 1601 if (!ret) 1602 ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx)); 1603 1604 out: 1605 bpf_prog_array_free(progs); 1606 kfree(user_ctx); 1607 return ret; 1608 } 1609 1610 int bpf_prog_test_run_syscall(struct bpf_prog *prog, 1611 const union bpf_attr *kattr, 1612 union bpf_attr __user *uattr) 1613 { 1614 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); 1615 __u32 ctx_size_in = kattr->test.ctx_size_in; 1616 void *ctx = NULL; 1617 u32 retval; 1618 int err = 0; 1619 1620 /* doesn't support data_in/out, ctx_out, duration, or repeat or flags */ 1621 if (kattr->test.data_in || kattr->test.data_out || 1622 kattr->test.ctx_out || kattr->test.duration || 1623 kattr->test.repeat || kattr->test.flags || 1624 kattr->test.batch_size) 1625 return -EINVAL; 1626 1627 if (ctx_size_in < prog->aux->max_ctx_offset || 1628 ctx_size_in > U16_MAX) 1629 return -EINVAL; 1630 1631 if (ctx_size_in) { 1632 ctx = memdup_user(ctx_in, ctx_size_in); 1633 if (IS_ERR(ctx)) 1634 return PTR_ERR(ctx); 1635 } 1636 1637 rcu_read_lock_trace(); 1638 retval = bpf_prog_run_pin_on_cpu(prog, ctx); 1639 rcu_read_unlock_trace(); 1640 1641 if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) { 1642 err = -EFAULT; 1643 goto out; 1644 } 1645 if (ctx_size_in) 1646 if (copy_to_user(ctx_in, ctx, ctx_size_in)) 1647 err = -EFAULT; 1648 out: 1649 kfree(ctx); 1650 return err; 1651 } 1652 1653 static const struct btf_kfunc_id_set bpf_prog_test_kfunc_set = { 1654 .owner = THIS_MODULE, 1655 .set = &test_sk_check_kfunc_ids, 1656 }; 1657 1658 BTF_ID_LIST(bpf_prog_test_dtor_kfunc_ids) 1659 BTF_ID(struct, prog_test_ref_kfunc) 1660 BTF_ID(func, bpf_kfunc_call_test_release) 1661 BTF_ID(struct, prog_test_member) 1662 BTF_ID(func, bpf_kfunc_call_memb_release) 1663 1664 static int __init bpf_prog_test_run_init(void) 1665 { 1666 const struct btf_id_dtor_kfunc bpf_prog_test_dtor_kfunc[] = { 1667 { 1668 .btf_id = bpf_prog_test_dtor_kfunc_ids[0], 1669 .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[1] 1670 }, 1671 { 1672 .btf_id = bpf_prog_test_dtor_kfunc_ids[2], 1673 .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[3], 1674 }, 1675 }; 1676 int ret; 1677 1678 ret = register_btf_fmodret_id_set(&bpf_test_modify_return_set); 1679 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set); 1680 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set); 1681 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set); 1682 return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc, 1683 ARRAY_SIZE(bpf_prog_test_dtor_kfunc), 1684 THIS_MODULE); 1685 } 1686 late_initcall(bpf_prog_test_run_init); 1687