1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2017 Facebook 3 */ 4 #include <linux/bpf.h> 5 #include <linux/btf_ids.h> 6 #include <linux/slab.h> 7 #include <linux/vmalloc.h> 8 #include <linux/etherdevice.h> 9 #include <linux/filter.h> 10 #include <linux/rcupdate_trace.h> 11 #include <linux/sched/signal.h> 12 #include <net/bpf_sk_storage.h> 13 #include <net/sock.h> 14 #include <net/tcp.h> 15 #include <net/net_namespace.h> 16 #include <linux/error-injection.h> 17 #include <linux/smp.h> 18 #include <linux/sock_diag.h> 19 #include <net/xdp.h> 20 21 #define CREATE_TRACE_POINTS 22 #include <trace/events/bpf_test_run.h> 23 24 struct bpf_test_timer { 25 enum { NO_PREEMPT, NO_MIGRATE } mode; 26 u32 i; 27 u64 time_start, time_spent; 28 }; 29 30 static void bpf_test_timer_enter(struct bpf_test_timer *t) 31 __acquires(rcu) 32 { 33 rcu_read_lock(); 34 if (t->mode == NO_PREEMPT) 35 preempt_disable(); 36 else 37 migrate_disable(); 38 39 t->time_start = ktime_get_ns(); 40 } 41 42 static void bpf_test_timer_leave(struct bpf_test_timer *t) 43 __releases(rcu) 44 { 45 t->time_start = 0; 46 47 if (t->mode == NO_PREEMPT) 48 preempt_enable(); 49 else 50 migrate_enable(); 51 rcu_read_unlock(); 52 } 53 54 static bool bpf_test_timer_continue(struct bpf_test_timer *t, u32 repeat, int *err, u32 *duration) 55 __must_hold(rcu) 56 { 57 t->i++; 58 if (t->i >= repeat) { 59 /* We're done. */ 60 t->time_spent += ktime_get_ns() - t->time_start; 61 do_div(t->time_spent, t->i); 62 *duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent; 63 *err = 0; 64 goto reset; 65 } 66 67 if (signal_pending(current)) { 68 /* During iteration: we've been cancelled, abort. */ 69 *err = -EINTR; 70 goto reset; 71 } 72 73 if (need_resched()) { 74 /* During iteration: we need to reschedule between runs. */ 75 t->time_spent += ktime_get_ns() - t->time_start; 76 bpf_test_timer_leave(t); 77 cond_resched(); 78 bpf_test_timer_enter(t); 79 } 80 81 /* Do another round. */ 82 return true; 83 84 reset: 85 t->i = 0; 86 return false; 87 } 88 89 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, 90 u32 *retval, u32 *time, bool xdp) 91 { 92 struct bpf_prog_array_item item = {.prog = prog}; 93 struct bpf_run_ctx *old_ctx; 94 struct bpf_cg_run_ctx run_ctx; 95 struct bpf_test_timer t = { NO_MIGRATE }; 96 enum bpf_cgroup_storage_type stype; 97 int ret; 98 99 for_each_cgroup_storage_type(stype) { 100 item.cgroup_storage[stype] = bpf_cgroup_storage_alloc(prog, stype); 101 if (IS_ERR(item.cgroup_storage[stype])) { 102 item.cgroup_storage[stype] = NULL; 103 for_each_cgroup_storage_type(stype) 104 bpf_cgroup_storage_free(item.cgroup_storage[stype]); 105 return -ENOMEM; 106 } 107 } 108 109 if (!repeat) 110 repeat = 1; 111 112 bpf_test_timer_enter(&t); 113 old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 114 do { 115 run_ctx.prog_item = &item; 116 if (xdp) 117 *retval = bpf_prog_run_xdp(prog, ctx); 118 else 119 *retval = bpf_prog_run(prog, ctx); 120 } while (bpf_test_timer_continue(&t, repeat, &ret, time)); 121 bpf_reset_run_ctx(old_ctx); 122 bpf_test_timer_leave(&t); 123 124 for_each_cgroup_storage_type(stype) 125 bpf_cgroup_storage_free(item.cgroup_storage[stype]); 126 127 return ret; 128 } 129 130 static int bpf_test_finish(const union bpf_attr *kattr, 131 union bpf_attr __user *uattr, const void *data, 132 u32 size, u32 retval, u32 duration) 133 { 134 void __user *data_out = u64_to_user_ptr(kattr->test.data_out); 135 int err = -EFAULT; 136 u32 copy_size = size; 137 138 /* Clamp copy if the user has provided a size hint, but copy the full 139 * buffer if not to retain old behaviour. 140 */ 141 if (kattr->test.data_size_out && 142 copy_size > kattr->test.data_size_out) { 143 copy_size = kattr->test.data_size_out; 144 err = -ENOSPC; 145 } 146 147 if (data_out && copy_to_user(data_out, data, copy_size)) 148 goto out; 149 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size))) 150 goto out; 151 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval))) 152 goto out; 153 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration))) 154 goto out; 155 if (err != -ENOSPC) 156 err = 0; 157 out: 158 trace_bpf_test_finish(&err); 159 return err; 160 } 161 162 /* Integer types of various sizes and pointer combinations cover variety of 163 * architecture dependent calling conventions. 7+ can be supported in the 164 * future. 165 */ 166 __diag_push(); 167 __diag_ignore(GCC, 8, "-Wmissing-prototypes", 168 "Global functions as their definitions will be in vmlinux BTF"); 169 int noinline bpf_fentry_test1(int a) 170 { 171 return a + 1; 172 } 173 174 int noinline bpf_fentry_test2(int a, u64 b) 175 { 176 return a + b; 177 } 178 179 int noinline bpf_fentry_test3(char a, int b, u64 c) 180 { 181 return a + b + c; 182 } 183 184 int noinline bpf_fentry_test4(void *a, char b, int c, u64 d) 185 { 186 return (long)a + b + c + d; 187 } 188 189 int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e) 190 { 191 return a + (long)b + c + d + e; 192 } 193 194 int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f) 195 { 196 return a + (long)b + c + d + (long)e + f; 197 } 198 199 struct bpf_fentry_test_t { 200 struct bpf_fentry_test_t *a; 201 }; 202 203 int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg) 204 { 205 return (long)arg; 206 } 207 208 int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg) 209 { 210 return (long)arg->a; 211 } 212 213 int noinline bpf_modify_return_test(int a, int *b) 214 { 215 *b += 1; 216 return a + *b; 217 } 218 219 u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d) 220 { 221 return a + b + c + d; 222 } 223 224 int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b) 225 { 226 return a + b; 227 } 228 229 struct sock * noinline bpf_kfunc_call_test3(struct sock *sk) 230 { 231 return sk; 232 } 233 234 __diag_pop(); 235 236 ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO); 237 238 BTF_SET_START(test_sk_kfunc_ids) 239 BTF_ID(func, bpf_kfunc_call_test1) 240 BTF_ID(func, bpf_kfunc_call_test2) 241 BTF_ID(func, bpf_kfunc_call_test3) 242 BTF_SET_END(test_sk_kfunc_ids) 243 244 bool bpf_prog_test_check_kfunc_call(u32 kfunc_id) 245 { 246 return btf_id_set_contains(&test_sk_kfunc_ids, kfunc_id); 247 } 248 249 static void *bpf_test_init(const union bpf_attr *kattr, u32 size, 250 u32 headroom, u32 tailroom) 251 { 252 void __user *data_in = u64_to_user_ptr(kattr->test.data_in); 253 u32 user_size = kattr->test.data_size_in; 254 void *data; 255 256 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom) 257 return ERR_PTR(-EINVAL); 258 259 if (user_size > size) 260 return ERR_PTR(-EMSGSIZE); 261 262 data = kzalloc(size + headroom + tailroom, GFP_USER); 263 if (!data) 264 return ERR_PTR(-ENOMEM); 265 266 if (copy_from_user(data + headroom, data_in, user_size)) { 267 kfree(data); 268 return ERR_PTR(-EFAULT); 269 } 270 271 return data; 272 } 273 274 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 275 const union bpf_attr *kattr, 276 union bpf_attr __user *uattr) 277 { 278 struct bpf_fentry_test_t arg = {}; 279 u16 side_effect = 0, ret = 0; 280 int b = 2, err = -EFAULT; 281 u32 retval = 0; 282 283 if (kattr->test.flags || kattr->test.cpu) 284 return -EINVAL; 285 286 switch (prog->expected_attach_type) { 287 case BPF_TRACE_FENTRY: 288 case BPF_TRACE_FEXIT: 289 if (bpf_fentry_test1(1) != 2 || 290 bpf_fentry_test2(2, 3) != 5 || 291 bpf_fentry_test3(4, 5, 6) != 15 || 292 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 || 293 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 || 294 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 || 295 bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 || 296 bpf_fentry_test8(&arg) != 0) 297 goto out; 298 break; 299 case BPF_MODIFY_RETURN: 300 ret = bpf_modify_return_test(1, &b); 301 if (b != 2) 302 side_effect = 1; 303 break; 304 default: 305 goto out; 306 } 307 308 retval = ((u32)side_effect << 16) | ret; 309 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval))) 310 goto out; 311 312 err = 0; 313 out: 314 trace_bpf_test_finish(&err); 315 return err; 316 } 317 318 struct bpf_raw_tp_test_run_info { 319 struct bpf_prog *prog; 320 void *ctx; 321 u32 retval; 322 }; 323 324 static void 325 __bpf_prog_test_run_raw_tp(void *data) 326 { 327 struct bpf_raw_tp_test_run_info *info = data; 328 329 rcu_read_lock(); 330 info->retval = bpf_prog_run(info->prog, info->ctx); 331 rcu_read_unlock(); 332 } 333 334 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 335 const union bpf_attr *kattr, 336 union bpf_attr __user *uattr) 337 { 338 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); 339 __u32 ctx_size_in = kattr->test.ctx_size_in; 340 struct bpf_raw_tp_test_run_info info; 341 int cpu = kattr->test.cpu, err = 0; 342 int current_cpu; 343 344 /* doesn't support data_in/out, ctx_out, duration, or repeat */ 345 if (kattr->test.data_in || kattr->test.data_out || 346 kattr->test.ctx_out || kattr->test.duration || 347 kattr->test.repeat) 348 return -EINVAL; 349 350 if (ctx_size_in < prog->aux->max_ctx_offset || 351 ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64)) 352 return -EINVAL; 353 354 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0) 355 return -EINVAL; 356 357 if (ctx_size_in) { 358 info.ctx = kzalloc(ctx_size_in, GFP_USER); 359 if (!info.ctx) 360 return -ENOMEM; 361 if (copy_from_user(info.ctx, ctx_in, ctx_size_in)) { 362 err = -EFAULT; 363 goto out; 364 } 365 } else { 366 info.ctx = NULL; 367 } 368 369 info.prog = prog; 370 371 current_cpu = get_cpu(); 372 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 || 373 cpu == current_cpu) { 374 __bpf_prog_test_run_raw_tp(&info); 375 } else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) { 376 /* smp_call_function_single() also checks cpu_online() 377 * after csd_lock(). However, since cpu is from user 378 * space, let's do an extra quick check to filter out 379 * invalid value before smp_call_function_single(). 380 */ 381 err = -ENXIO; 382 } else { 383 err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp, 384 &info, 1); 385 } 386 put_cpu(); 387 388 if (!err && 389 copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32))) 390 err = -EFAULT; 391 392 out: 393 kfree(info.ctx); 394 return err; 395 } 396 397 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size) 398 { 399 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in); 400 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out); 401 u32 size = kattr->test.ctx_size_in; 402 void *data; 403 int err; 404 405 if (!data_in && !data_out) 406 return NULL; 407 408 data = kzalloc(max_size, GFP_USER); 409 if (!data) 410 return ERR_PTR(-ENOMEM); 411 412 if (data_in) { 413 err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size); 414 if (err) { 415 kfree(data); 416 return ERR_PTR(err); 417 } 418 419 size = min_t(u32, max_size, size); 420 if (copy_from_user(data, data_in, size)) { 421 kfree(data); 422 return ERR_PTR(-EFAULT); 423 } 424 } 425 return data; 426 } 427 428 static int bpf_ctx_finish(const union bpf_attr *kattr, 429 union bpf_attr __user *uattr, const void *data, 430 u32 size) 431 { 432 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out); 433 int err = -EFAULT; 434 u32 copy_size = size; 435 436 if (!data || !data_out) 437 return 0; 438 439 if (copy_size > kattr->test.ctx_size_out) { 440 copy_size = kattr->test.ctx_size_out; 441 err = -ENOSPC; 442 } 443 444 if (copy_to_user(data_out, data, copy_size)) 445 goto out; 446 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size))) 447 goto out; 448 if (err != -ENOSPC) 449 err = 0; 450 out: 451 return err; 452 } 453 454 /** 455 * range_is_zero - test whether buffer is initialized 456 * @buf: buffer to check 457 * @from: check from this position 458 * @to: check up until (excluding) this position 459 * 460 * This function returns true if the there is a non-zero byte 461 * in the buf in the range [from,to). 462 */ 463 static inline bool range_is_zero(void *buf, size_t from, size_t to) 464 { 465 return !memchr_inv((u8 *)buf + from, 0, to - from); 466 } 467 468 static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb) 469 { 470 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; 471 472 if (!__skb) 473 return 0; 474 475 /* make sure the fields we don't use are zeroed */ 476 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark))) 477 return -EINVAL; 478 479 /* mark is allowed */ 480 481 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark), 482 offsetof(struct __sk_buff, priority))) 483 return -EINVAL; 484 485 /* priority is allowed */ 486 487 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, priority), 488 offsetof(struct __sk_buff, ifindex))) 489 return -EINVAL; 490 491 /* ifindex is allowed */ 492 493 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex), 494 offsetof(struct __sk_buff, cb))) 495 return -EINVAL; 496 497 /* cb is allowed */ 498 499 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb), 500 offsetof(struct __sk_buff, tstamp))) 501 return -EINVAL; 502 503 /* tstamp is allowed */ 504 /* wire_len is allowed */ 505 /* gso_segs is allowed */ 506 507 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs), 508 offsetof(struct __sk_buff, gso_size))) 509 return -EINVAL; 510 511 /* gso_size is allowed */ 512 513 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size), 514 sizeof(struct __sk_buff))) 515 return -EINVAL; 516 517 skb->mark = __skb->mark; 518 skb->priority = __skb->priority; 519 skb->tstamp = __skb->tstamp; 520 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN); 521 522 if (__skb->wire_len == 0) { 523 cb->pkt_len = skb->len; 524 } else { 525 if (__skb->wire_len < skb->len || 526 __skb->wire_len > GSO_MAX_SIZE) 527 return -EINVAL; 528 cb->pkt_len = __skb->wire_len; 529 } 530 531 if (__skb->gso_segs > GSO_MAX_SEGS) 532 return -EINVAL; 533 skb_shinfo(skb)->gso_segs = __skb->gso_segs; 534 skb_shinfo(skb)->gso_size = __skb->gso_size; 535 536 return 0; 537 } 538 539 static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb) 540 { 541 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; 542 543 if (!__skb) 544 return; 545 546 __skb->mark = skb->mark; 547 __skb->priority = skb->priority; 548 __skb->ifindex = skb->dev->ifindex; 549 __skb->tstamp = skb->tstamp; 550 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN); 551 __skb->wire_len = cb->pkt_len; 552 __skb->gso_segs = skb_shinfo(skb)->gso_segs; 553 } 554 555 static struct proto bpf_dummy_proto = { 556 .name = "bpf_dummy", 557 .owner = THIS_MODULE, 558 .obj_size = sizeof(struct sock), 559 }; 560 561 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 562 union bpf_attr __user *uattr) 563 { 564 bool is_l2 = false, is_direct_pkt_access = false; 565 struct net *net = current->nsproxy->net_ns; 566 struct net_device *dev = net->loopback_dev; 567 u32 size = kattr->test.data_size_in; 568 u32 repeat = kattr->test.repeat; 569 struct __sk_buff *ctx = NULL; 570 u32 retval, duration; 571 int hh_len = ETH_HLEN; 572 struct sk_buff *skb; 573 struct sock *sk; 574 void *data; 575 int ret; 576 577 if (kattr->test.flags || kattr->test.cpu) 578 return -EINVAL; 579 580 data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN, 581 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); 582 if (IS_ERR(data)) 583 return PTR_ERR(data); 584 585 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff)); 586 if (IS_ERR(ctx)) { 587 kfree(data); 588 return PTR_ERR(ctx); 589 } 590 591 switch (prog->type) { 592 case BPF_PROG_TYPE_SCHED_CLS: 593 case BPF_PROG_TYPE_SCHED_ACT: 594 is_l2 = true; 595 fallthrough; 596 case BPF_PROG_TYPE_LWT_IN: 597 case BPF_PROG_TYPE_LWT_OUT: 598 case BPF_PROG_TYPE_LWT_XMIT: 599 is_direct_pkt_access = true; 600 break; 601 default: 602 break; 603 } 604 605 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1); 606 if (!sk) { 607 kfree(data); 608 kfree(ctx); 609 return -ENOMEM; 610 } 611 sock_init_data(NULL, sk); 612 613 skb = build_skb(data, 0); 614 if (!skb) { 615 kfree(data); 616 kfree(ctx); 617 sk_free(sk); 618 return -ENOMEM; 619 } 620 skb->sk = sk; 621 622 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); 623 __skb_put(skb, size); 624 if (ctx && ctx->ifindex > 1) { 625 dev = dev_get_by_index(net, ctx->ifindex); 626 if (!dev) { 627 ret = -ENODEV; 628 goto out; 629 } 630 } 631 skb->protocol = eth_type_trans(skb, dev); 632 skb_reset_network_header(skb); 633 634 switch (skb->protocol) { 635 case htons(ETH_P_IP): 636 sk->sk_family = AF_INET; 637 if (sizeof(struct iphdr) <= skb_headlen(skb)) { 638 sk->sk_rcv_saddr = ip_hdr(skb)->saddr; 639 sk->sk_daddr = ip_hdr(skb)->daddr; 640 } 641 break; 642 #if IS_ENABLED(CONFIG_IPV6) 643 case htons(ETH_P_IPV6): 644 sk->sk_family = AF_INET6; 645 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) { 646 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr; 647 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr; 648 } 649 break; 650 #endif 651 default: 652 break; 653 } 654 655 if (is_l2) 656 __skb_push(skb, hh_len); 657 if (is_direct_pkt_access) 658 bpf_compute_data_pointers(skb); 659 ret = convert___skb_to_skb(skb, ctx); 660 if (ret) 661 goto out; 662 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false); 663 if (ret) 664 goto out; 665 if (!is_l2) { 666 if (skb_headroom(skb) < hh_len) { 667 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb)); 668 669 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) { 670 ret = -ENOMEM; 671 goto out; 672 } 673 } 674 memset(__skb_push(skb, hh_len), 0, hh_len); 675 } 676 convert_skb_to___skb(skb, ctx); 677 678 size = skb->len; 679 /* bpf program can never convert linear skb to non-linear */ 680 if (WARN_ON_ONCE(skb_is_nonlinear(skb))) 681 size = skb_headlen(skb); 682 ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration); 683 if (!ret) 684 ret = bpf_ctx_finish(kattr, uattr, ctx, 685 sizeof(struct __sk_buff)); 686 out: 687 if (dev && dev != net->loopback_dev) 688 dev_put(dev); 689 kfree_skb(skb); 690 sk_free(sk); 691 kfree(ctx); 692 return ret; 693 } 694 695 static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp) 696 { 697 unsigned int ingress_ifindex, rx_queue_index; 698 struct netdev_rx_queue *rxqueue; 699 struct net_device *device; 700 701 if (!xdp_md) 702 return 0; 703 704 if (xdp_md->egress_ifindex != 0) 705 return -EINVAL; 706 707 ingress_ifindex = xdp_md->ingress_ifindex; 708 rx_queue_index = xdp_md->rx_queue_index; 709 710 if (!ingress_ifindex && rx_queue_index) 711 return -EINVAL; 712 713 if (ingress_ifindex) { 714 device = dev_get_by_index(current->nsproxy->net_ns, 715 ingress_ifindex); 716 if (!device) 717 return -ENODEV; 718 719 if (rx_queue_index >= device->real_num_rx_queues) 720 goto free_dev; 721 722 rxqueue = __netif_get_rx_queue(device, rx_queue_index); 723 724 if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq)) 725 goto free_dev; 726 727 xdp->rxq = &rxqueue->xdp_rxq; 728 /* The device is now tracked in the xdp->rxq for later 729 * dev_put() 730 */ 731 } 732 733 xdp->data = xdp->data_meta + xdp_md->data; 734 return 0; 735 736 free_dev: 737 dev_put(device); 738 return -EINVAL; 739 } 740 741 static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md) 742 { 743 if (!xdp_md) 744 return; 745 746 xdp_md->data = xdp->data - xdp->data_meta; 747 xdp_md->data_end = xdp->data_end - xdp->data_meta; 748 749 if (xdp_md->ingress_ifindex) 750 dev_put(xdp->rxq->dev); 751 } 752 753 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 754 union bpf_attr __user *uattr) 755 { 756 u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 757 u32 headroom = XDP_PACKET_HEADROOM; 758 u32 size = kattr->test.data_size_in; 759 u32 repeat = kattr->test.repeat; 760 struct netdev_rx_queue *rxqueue; 761 struct xdp_buff xdp = {}; 762 u32 retval, duration; 763 struct xdp_md *ctx; 764 u32 max_data_sz; 765 void *data; 766 int ret = -EINVAL; 767 768 if (prog->expected_attach_type == BPF_XDP_DEVMAP || 769 prog->expected_attach_type == BPF_XDP_CPUMAP) 770 return -EINVAL; 771 772 ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md)); 773 if (IS_ERR(ctx)) 774 return PTR_ERR(ctx); 775 776 if (ctx) { 777 /* There can't be user provided data before the meta data */ 778 if (ctx->data_meta || ctx->data_end != size || 779 ctx->data > ctx->data_end || 780 unlikely(xdp_metalen_invalid(ctx->data))) 781 goto free_ctx; 782 /* Meta data is allocated from the headroom */ 783 headroom -= ctx->data; 784 } 785 786 /* XDP have extra tailroom as (most) drivers use full page */ 787 max_data_sz = 4096 - headroom - tailroom; 788 789 data = bpf_test_init(kattr, max_data_sz, headroom, tailroom); 790 if (IS_ERR(data)) { 791 ret = PTR_ERR(data); 792 goto free_ctx; 793 } 794 795 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0); 796 xdp_init_buff(&xdp, headroom + max_data_sz + tailroom, 797 &rxqueue->xdp_rxq); 798 xdp_prepare_buff(&xdp, data, headroom, size, true); 799 800 ret = xdp_convert_md_to_buff(ctx, &xdp); 801 if (ret) 802 goto free_data; 803 804 bpf_prog_change_xdp(NULL, prog); 805 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true); 806 /* We convert the xdp_buff back to an xdp_md before checking the return 807 * code so the reference count of any held netdevice will be decremented 808 * even if the test run failed. 809 */ 810 xdp_convert_buff_to_md(&xdp, ctx); 811 if (ret) 812 goto out; 813 814 if (xdp.data_meta != data + headroom || 815 xdp.data_end != xdp.data_meta + size) 816 size = xdp.data_end - xdp.data_meta; 817 818 ret = bpf_test_finish(kattr, uattr, xdp.data_meta, size, retval, 819 duration); 820 if (!ret) 821 ret = bpf_ctx_finish(kattr, uattr, ctx, 822 sizeof(struct xdp_md)); 823 824 out: 825 bpf_prog_change_xdp(prog, NULL); 826 free_data: 827 kfree(data); 828 free_ctx: 829 kfree(ctx); 830 return ret; 831 } 832 833 static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx) 834 { 835 /* make sure the fields we don't use are zeroed */ 836 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags))) 837 return -EINVAL; 838 839 /* flags is allowed */ 840 841 if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags), 842 sizeof(struct bpf_flow_keys))) 843 return -EINVAL; 844 845 return 0; 846 } 847 848 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 849 const union bpf_attr *kattr, 850 union bpf_attr __user *uattr) 851 { 852 struct bpf_test_timer t = { NO_PREEMPT }; 853 u32 size = kattr->test.data_size_in; 854 struct bpf_flow_dissector ctx = {}; 855 u32 repeat = kattr->test.repeat; 856 struct bpf_flow_keys *user_ctx; 857 struct bpf_flow_keys flow_keys; 858 const struct ethhdr *eth; 859 unsigned int flags = 0; 860 u32 retval, duration; 861 void *data; 862 int ret; 863 864 if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR) 865 return -EINVAL; 866 867 if (kattr->test.flags || kattr->test.cpu) 868 return -EINVAL; 869 870 if (size < ETH_HLEN) 871 return -EINVAL; 872 873 data = bpf_test_init(kattr, size, 0, 0); 874 if (IS_ERR(data)) 875 return PTR_ERR(data); 876 877 eth = (struct ethhdr *)data; 878 879 if (!repeat) 880 repeat = 1; 881 882 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys)); 883 if (IS_ERR(user_ctx)) { 884 kfree(data); 885 return PTR_ERR(user_ctx); 886 } 887 if (user_ctx) { 888 ret = verify_user_bpf_flow_keys(user_ctx); 889 if (ret) 890 goto out; 891 flags = user_ctx->flags; 892 } 893 894 ctx.flow_keys = &flow_keys; 895 ctx.data = data; 896 ctx.data_end = (__u8 *)data + size; 897 898 bpf_test_timer_enter(&t); 899 do { 900 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN, 901 size, flags); 902 } while (bpf_test_timer_continue(&t, repeat, &ret, &duration)); 903 bpf_test_timer_leave(&t); 904 905 if (ret < 0) 906 goto out; 907 908 ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys), 909 retval, duration); 910 if (!ret) 911 ret = bpf_ctx_finish(kattr, uattr, user_ctx, 912 sizeof(struct bpf_flow_keys)); 913 914 out: 915 kfree(user_ctx); 916 kfree(data); 917 return ret; 918 } 919 920 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr, 921 union bpf_attr __user *uattr) 922 { 923 struct bpf_test_timer t = { NO_PREEMPT }; 924 struct bpf_prog_array *progs = NULL; 925 struct bpf_sk_lookup_kern ctx = {}; 926 u32 repeat = kattr->test.repeat; 927 struct bpf_sk_lookup *user_ctx; 928 u32 retval, duration; 929 int ret = -EINVAL; 930 931 if (prog->type != BPF_PROG_TYPE_SK_LOOKUP) 932 return -EINVAL; 933 934 if (kattr->test.flags || kattr->test.cpu) 935 return -EINVAL; 936 937 if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out || 938 kattr->test.data_size_out) 939 return -EINVAL; 940 941 if (!repeat) 942 repeat = 1; 943 944 user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx)); 945 if (IS_ERR(user_ctx)) 946 return PTR_ERR(user_ctx); 947 948 if (!user_ctx) 949 return -EINVAL; 950 951 if (user_ctx->sk) 952 goto out; 953 954 if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx))) 955 goto out; 956 957 if (user_ctx->local_port > U16_MAX || user_ctx->remote_port > U16_MAX) { 958 ret = -ERANGE; 959 goto out; 960 } 961 962 ctx.family = (u16)user_ctx->family; 963 ctx.protocol = (u16)user_ctx->protocol; 964 ctx.dport = (u16)user_ctx->local_port; 965 ctx.sport = (__force __be16)user_ctx->remote_port; 966 967 switch (ctx.family) { 968 case AF_INET: 969 ctx.v4.daddr = (__force __be32)user_ctx->local_ip4; 970 ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4; 971 break; 972 973 #if IS_ENABLED(CONFIG_IPV6) 974 case AF_INET6: 975 ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6; 976 ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6; 977 break; 978 #endif 979 980 default: 981 ret = -EAFNOSUPPORT; 982 goto out; 983 } 984 985 progs = bpf_prog_array_alloc(1, GFP_KERNEL); 986 if (!progs) { 987 ret = -ENOMEM; 988 goto out; 989 } 990 991 progs->items[0].prog = prog; 992 993 bpf_test_timer_enter(&t); 994 do { 995 ctx.selected_sk = NULL; 996 retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run); 997 } while (bpf_test_timer_continue(&t, repeat, &ret, &duration)); 998 bpf_test_timer_leave(&t); 999 1000 if (ret < 0) 1001 goto out; 1002 1003 user_ctx->cookie = 0; 1004 if (ctx.selected_sk) { 1005 if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) { 1006 ret = -EOPNOTSUPP; 1007 goto out; 1008 } 1009 1010 user_ctx->cookie = sock_gen_cookie(ctx.selected_sk); 1011 } 1012 1013 ret = bpf_test_finish(kattr, uattr, NULL, 0, retval, duration); 1014 if (!ret) 1015 ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx)); 1016 1017 out: 1018 bpf_prog_array_free(progs); 1019 kfree(user_ctx); 1020 return ret; 1021 } 1022 1023 int bpf_prog_test_run_syscall(struct bpf_prog *prog, 1024 const union bpf_attr *kattr, 1025 union bpf_attr __user *uattr) 1026 { 1027 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); 1028 __u32 ctx_size_in = kattr->test.ctx_size_in; 1029 void *ctx = NULL; 1030 u32 retval; 1031 int err = 0; 1032 1033 /* doesn't support data_in/out, ctx_out, duration, or repeat or flags */ 1034 if (kattr->test.data_in || kattr->test.data_out || 1035 kattr->test.ctx_out || kattr->test.duration || 1036 kattr->test.repeat || kattr->test.flags) 1037 return -EINVAL; 1038 1039 if (ctx_size_in < prog->aux->max_ctx_offset || 1040 ctx_size_in > U16_MAX) 1041 return -EINVAL; 1042 1043 if (ctx_size_in) { 1044 ctx = kzalloc(ctx_size_in, GFP_USER); 1045 if (!ctx) 1046 return -ENOMEM; 1047 if (copy_from_user(ctx, ctx_in, ctx_size_in)) { 1048 err = -EFAULT; 1049 goto out; 1050 } 1051 } 1052 1053 rcu_read_lock_trace(); 1054 retval = bpf_prog_run_pin_on_cpu(prog, ctx); 1055 rcu_read_unlock_trace(); 1056 1057 if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) { 1058 err = -EFAULT; 1059 goto out; 1060 } 1061 if (ctx_size_in) 1062 if (copy_to_user(ctx_in, ctx, ctx_size_in)) 1063 err = -EFAULT; 1064 out: 1065 kfree(ctx); 1066 return err; 1067 } 1068