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/vmalloc.h> 9 #include <linux/etherdevice.h> 10 #include <linux/filter.h> 11 #include <linux/rcupdate_trace.h> 12 #include <linux/sched/signal.h> 13 #include <net/bpf_sk_storage.h> 14 #include <net/sock.h> 15 #include <net/tcp.h> 16 #include <net/net_namespace.h> 17 #include <linux/error-injection.h> 18 #include <linux/smp.h> 19 #include <linux/sock_diag.h> 20 #include <net/xdp.h> 21 22 #define CREATE_TRACE_POINTS 23 #include <trace/events/bpf_test_run.h> 24 25 struct bpf_test_timer { 26 enum { NO_PREEMPT, NO_MIGRATE } mode; 27 u32 i; 28 u64 time_start, time_spent; 29 }; 30 31 static void bpf_test_timer_enter(struct bpf_test_timer *t) 32 __acquires(rcu) 33 { 34 rcu_read_lock(); 35 if (t->mode == NO_PREEMPT) 36 preempt_disable(); 37 else 38 migrate_disable(); 39 40 t->time_start = ktime_get_ns(); 41 } 42 43 static void bpf_test_timer_leave(struct bpf_test_timer *t) 44 __releases(rcu) 45 { 46 t->time_start = 0; 47 48 if (t->mode == NO_PREEMPT) 49 preempt_enable(); 50 else 51 migrate_enable(); 52 rcu_read_unlock(); 53 } 54 55 static bool bpf_test_timer_continue(struct bpf_test_timer *t, u32 repeat, int *err, u32 *duration) 56 __must_hold(rcu) 57 { 58 t->i++; 59 if (t->i >= repeat) { 60 /* We're done. */ 61 t->time_spent += ktime_get_ns() - t->time_start; 62 do_div(t->time_spent, t->i); 63 *duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent; 64 *err = 0; 65 goto reset; 66 } 67 68 if (signal_pending(current)) { 69 /* During iteration: we've been cancelled, abort. */ 70 *err = -EINTR; 71 goto reset; 72 } 73 74 if (need_resched()) { 75 /* During iteration: we need to reschedule between runs. */ 76 t->time_spent += ktime_get_ns() - t->time_start; 77 bpf_test_timer_leave(t); 78 cond_resched(); 79 bpf_test_timer_enter(t); 80 } 81 82 /* Do another round. */ 83 return true; 84 85 reset: 86 t->i = 0; 87 return false; 88 } 89 90 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat, 91 u32 *retval, u32 *time, bool xdp) 92 { 93 struct bpf_prog_array_item item = {.prog = prog}; 94 struct bpf_run_ctx *old_ctx; 95 struct bpf_cg_run_ctx run_ctx; 96 struct bpf_test_timer t = { NO_MIGRATE }; 97 enum bpf_cgroup_storage_type stype; 98 int ret; 99 100 for_each_cgroup_storage_type(stype) { 101 item.cgroup_storage[stype] = bpf_cgroup_storage_alloc(prog, stype); 102 if (IS_ERR(item.cgroup_storage[stype])) { 103 item.cgroup_storage[stype] = NULL; 104 for_each_cgroup_storage_type(stype) 105 bpf_cgroup_storage_free(item.cgroup_storage[stype]); 106 return -ENOMEM; 107 } 108 } 109 110 if (!repeat) 111 repeat = 1; 112 113 bpf_test_timer_enter(&t); 114 old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 115 do { 116 run_ctx.prog_item = &item; 117 if (xdp) 118 *retval = bpf_prog_run_xdp(prog, ctx); 119 else 120 *retval = bpf_prog_run(prog, ctx); 121 } while (bpf_test_timer_continue(&t, repeat, &ret, time)); 122 bpf_reset_run_ctx(old_ctx); 123 bpf_test_timer_leave(&t); 124 125 for_each_cgroup_storage_type(stype) 126 bpf_cgroup_storage_free(item.cgroup_storage[stype]); 127 128 return ret; 129 } 130 131 static int bpf_test_finish(const union bpf_attr *kattr, 132 union bpf_attr __user *uattr, const void *data, 133 u32 size, u32 retval, u32 duration) 134 { 135 void __user *data_out = u64_to_user_ptr(kattr->test.data_out); 136 int err = -EFAULT; 137 u32 copy_size = size; 138 139 /* Clamp copy if the user has provided a size hint, but copy the full 140 * buffer if not to retain old behaviour. 141 */ 142 if (kattr->test.data_size_out && 143 copy_size > kattr->test.data_size_out) { 144 copy_size = kattr->test.data_size_out; 145 err = -ENOSPC; 146 } 147 148 if (data_out && copy_to_user(data_out, data, copy_size)) 149 goto out; 150 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size))) 151 goto out; 152 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval))) 153 goto out; 154 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration))) 155 goto out; 156 if (err != -ENOSPC) 157 err = 0; 158 out: 159 trace_bpf_test_finish(&err); 160 return err; 161 } 162 163 /* Integer types of various sizes and pointer combinations cover variety of 164 * architecture dependent calling conventions. 7+ can be supported in the 165 * future. 166 */ 167 __diag_push(); 168 __diag_ignore(GCC, 8, "-Wmissing-prototypes", 169 "Global functions as their definitions will be in vmlinux BTF"); 170 int noinline bpf_fentry_test1(int a) 171 { 172 return a + 1; 173 } 174 175 int noinline bpf_fentry_test2(int a, u64 b) 176 { 177 return a + b; 178 } 179 180 int noinline bpf_fentry_test3(char a, int b, u64 c) 181 { 182 return a + b + c; 183 } 184 185 int noinline bpf_fentry_test4(void *a, char b, int c, u64 d) 186 { 187 return (long)a + b + c + d; 188 } 189 190 int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e) 191 { 192 return a + (long)b + c + d + e; 193 } 194 195 int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f) 196 { 197 return a + (long)b + c + d + (long)e + f; 198 } 199 200 struct bpf_fentry_test_t { 201 struct bpf_fentry_test_t *a; 202 }; 203 204 int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg) 205 { 206 return (long)arg; 207 } 208 209 int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg) 210 { 211 return (long)arg->a; 212 } 213 214 int noinline bpf_modify_return_test(int a, int *b) 215 { 216 *b += 1; 217 return a + *b; 218 } 219 220 u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d) 221 { 222 return a + b + c + d; 223 } 224 225 int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b) 226 { 227 return a + b; 228 } 229 230 struct sock * noinline bpf_kfunc_call_test3(struct sock *sk) 231 { 232 return sk; 233 } 234 235 __diag_pop(); 236 237 ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO); 238 239 BTF_SET_START(test_sk_kfunc_ids) 240 BTF_ID(func, bpf_kfunc_call_test1) 241 BTF_ID(func, bpf_kfunc_call_test2) 242 BTF_ID(func, bpf_kfunc_call_test3) 243 BTF_SET_END(test_sk_kfunc_ids) 244 245 bool bpf_prog_test_check_kfunc_call(u32 kfunc_id, struct module *owner) 246 { 247 if (btf_id_set_contains(&test_sk_kfunc_ids, kfunc_id)) 248 return true; 249 return bpf_check_mod_kfunc_call(&prog_test_kfunc_list, kfunc_id, owner); 250 } 251 252 static void *bpf_test_init(const union bpf_attr *kattr, u32 size, 253 u32 headroom, u32 tailroom) 254 { 255 void __user *data_in = u64_to_user_ptr(kattr->test.data_in); 256 u32 user_size = kattr->test.data_size_in; 257 void *data; 258 259 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom) 260 return ERR_PTR(-EINVAL); 261 262 if (user_size > size) 263 return ERR_PTR(-EMSGSIZE); 264 265 data = kzalloc(size + headroom + tailroom, GFP_USER); 266 if (!data) 267 return ERR_PTR(-ENOMEM); 268 269 if (copy_from_user(data + headroom, data_in, user_size)) { 270 kfree(data); 271 return ERR_PTR(-EFAULT); 272 } 273 274 return data; 275 } 276 277 int bpf_prog_test_run_tracing(struct bpf_prog *prog, 278 const union bpf_attr *kattr, 279 union bpf_attr __user *uattr) 280 { 281 struct bpf_fentry_test_t arg = {}; 282 u16 side_effect = 0, ret = 0; 283 int b = 2, err = -EFAULT; 284 u32 retval = 0; 285 286 if (kattr->test.flags || kattr->test.cpu) 287 return -EINVAL; 288 289 switch (prog->expected_attach_type) { 290 case BPF_TRACE_FENTRY: 291 case BPF_TRACE_FEXIT: 292 if (bpf_fentry_test1(1) != 2 || 293 bpf_fentry_test2(2, 3) != 5 || 294 bpf_fentry_test3(4, 5, 6) != 15 || 295 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 || 296 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 || 297 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 || 298 bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 || 299 bpf_fentry_test8(&arg) != 0) 300 goto out; 301 break; 302 case BPF_MODIFY_RETURN: 303 ret = bpf_modify_return_test(1, &b); 304 if (b != 2) 305 side_effect = 1; 306 break; 307 default: 308 goto out; 309 } 310 311 retval = ((u32)side_effect << 16) | ret; 312 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval))) 313 goto out; 314 315 err = 0; 316 out: 317 trace_bpf_test_finish(&err); 318 return err; 319 } 320 321 struct bpf_raw_tp_test_run_info { 322 struct bpf_prog *prog; 323 void *ctx; 324 u32 retval; 325 }; 326 327 static void 328 __bpf_prog_test_run_raw_tp(void *data) 329 { 330 struct bpf_raw_tp_test_run_info *info = data; 331 332 rcu_read_lock(); 333 info->retval = bpf_prog_run(info->prog, info->ctx); 334 rcu_read_unlock(); 335 } 336 337 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog, 338 const union bpf_attr *kattr, 339 union bpf_attr __user *uattr) 340 { 341 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); 342 __u32 ctx_size_in = kattr->test.ctx_size_in; 343 struct bpf_raw_tp_test_run_info info; 344 int cpu = kattr->test.cpu, err = 0; 345 int current_cpu; 346 347 /* doesn't support data_in/out, ctx_out, duration, or repeat */ 348 if (kattr->test.data_in || kattr->test.data_out || 349 kattr->test.ctx_out || kattr->test.duration || 350 kattr->test.repeat) 351 return -EINVAL; 352 353 if (ctx_size_in < prog->aux->max_ctx_offset || 354 ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64)) 355 return -EINVAL; 356 357 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0) 358 return -EINVAL; 359 360 if (ctx_size_in) { 361 info.ctx = kzalloc(ctx_size_in, GFP_USER); 362 if (!info.ctx) 363 return -ENOMEM; 364 if (copy_from_user(info.ctx, ctx_in, ctx_size_in)) { 365 err = -EFAULT; 366 goto out; 367 } 368 } else { 369 info.ctx = NULL; 370 } 371 372 info.prog = prog; 373 374 current_cpu = get_cpu(); 375 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 || 376 cpu == current_cpu) { 377 __bpf_prog_test_run_raw_tp(&info); 378 } else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) { 379 /* smp_call_function_single() also checks cpu_online() 380 * after csd_lock(). However, since cpu is from user 381 * space, let's do an extra quick check to filter out 382 * invalid value before smp_call_function_single(). 383 */ 384 err = -ENXIO; 385 } else { 386 err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp, 387 &info, 1); 388 } 389 put_cpu(); 390 391 if (!err && 392 copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32))) 393 err = -EFAULT; 394 395 out: 396 kfree(info.ctx); 397 return err; 398 } 399 400 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size) 401 { 402 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in); 403 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out); 404 u32 size = kattr->test.ctx_size_in; 405 void *data; 406 int err; 407 408 if (!data_in && !data_out) 409 return NULL; 410 411 data = kzalloc(max_size, GFP_USER); 412 if (!data) 413 return ERR_PTR(-ENOMEM); 414 415 if (data_in) { 416 err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size); 417 if (err) { 418 kfree(data); 419 return ERR_PTR(err); 420 } 421 422 size = min_t(u32, max_size, size); 423 if (copy_from_user(data, data_in, size)) { 424 kfree(data); 425 return ERR_PTR(-EFAULT); 426 } 427 } 428 return data; 429 } 430 431 static int bpf_ctx_finish(const union bpf_attr *kattr, 432 union bpf_attr __user *uattr, const void *data, 433 u32 size) 434 { 435 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out); 436 int err = -EFAULT; 437 u32 copy_size = size; 438 439 if (!data || !data_out) 440 return 0; 441 442 if (copy_size > kattr->test.ctx_size_out) { 443 copy_size = kattr->test.ctx_size_out; 444 err = -ENOSPC; 445 } 446 447 if (copy_to_user(data_out, data, copy_size)) 448 goto out; 449 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size))) 450 goto out; 451 if (err != -ENOSPC) 452 err = 0; 453 out: 454 return err; 455 } 456 457 /** 458 * range_is_zero - test whether buffer is initialized 459 * @buf: buffer to check 460 * @from: check from this position 461 * @to: check up until (excluding) this position 462 * 463 * This function returns true if the there is a non-zero byte 464 * in the buf in the range [from,to). 465 */ 466 static inline bool range_is_zero(void *buf, size_t from, size_t to) 467 { 468 return !memchr_inv((u8 *)buf + from, 0, to - from); 469 } 470 471 static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb) 472 { 473 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; 474 475 if (!__skb) 476 return 0; 477 478 /* make sure the fields we don't use are zeroed */ 479 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark))) 480 return -EINVAL; 481 482 /* mark is allowed */ 483 484 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark), 485 offsetof(struct __sk_buff, priority))) 486 return -EINVAL; 487 488 /* priority is allowed */ 489 /* ingress_ifindex is allowed */ 490 /* ifindex is allowed */ 491 492 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex), 493 offsetof(struct __sk_buff, cb))) 494 return -EINVAL; 495 496 /* cb is allowed */ 497 498 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb), 499 offsetof(struct __sk_buff, tstamp))) 500 return -EINVAL; 501 502 /* tstamp is allowed */ 503 /* wire_len is allowed */ 504 /* gso_segs is allowed */ 505 506 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs), 507 offsetof(struct __sk_buff, gso_size))) 508 return -EINVAL; 509 510 /* gso_size is allowed */ 511 512 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size), 513 offsetof(struct __sk_buff, hwtstamp))) 514 return -EINVAL; 515 516 /* hwtstamp is allowed */ 517 518 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, hwtstamp), 519 sizeof(struct __sk_buff))) 520 return -EINVAL; 521 522 skb->mark = __skb->mark; 523 skb->priority = __skb->priority; 524 skb->skb_iif = __skb->ingress_ifindex; 525 skb->tstamp = __skb->tstamp; 526 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN); 527 528 if (__skb->wire_len == 0) { 529 cb->pkt_len = skb->len; 530 } else { 531 if (__skb->wire_len < skb->len || 532 __skb->wire_len > GSO_MAX_SIZE) 533 return -EINVAL; 534 cb->pkt_len = __skb->wire_len; 535 } 536 537 if (__skb->gso_segs > GSO_MAX_SEGS) 538 return -EINVAL; 539 skb_shinfo(skb)->gso_segs = __skb->gso_segs; 540 skb_shinfo(skb)->gso_size = __skb->gso_size; 541 skb_shinfo(skb)->hwtstamps.hwtstamp = __skb->hwtstamp; 542 543 return 0; 544 } 545 546 static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb) 547 { 548 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb; 549 550 if (!__skb) 551 return; 552 553 __skb->mark = skb->mark; 554 __skb->priority = skb->priority; 555 __skb->ingress_ifindex = skb->skb_iif; 556 __skb->ifindex = skb->dev->ifindex; 557 __skb->tstamp = skb->tstamp; 558 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN); 559 __skb->wire_len = cb->pkt_len; 560 __skb->gso_segs = skb_shinfo(skb)->gso_segs; 561 __skb->hwtstamp = skb_shinfo(skb)->hwtstamps.hwtstamp; 562 } 563 564 static struct proto bpf_dummy_proto = { 565 .name = "bpf_dummy", 566 .owner = THIS_MODULE, 567 .obj_size = sizeof(struct sock), 568 }; 569 570 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr, 571 union bpf_attr __user *uattr) 572 { 573 bool is_l2 = false, is_direct_pkt_access = false; 574 struct net *net = current->nsproxy->net_ns; 575 struct net_device *dev = net->loopback_dev; 576 u32 size = kattr->test.data_size_in; 577 u32 repeat = kattr->test.repeat; 578 struct __sk_buff *ctx = NULL; 579 u32 retval, duration; 580 int hh_len = ETH_HLEN; 581 struct sk_buff *skb; 582 struct sock *sk; 583 void *data; 584 int ret; 585 586 if (kattr->test.flags || kattr->test.cpu) 587 return -EINVAL; 588 589 data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN, 590 SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); 591 if (IS_ERR(data)) 592 return PTR_ERR(data); 593 594 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff)); 595 if (IS_ERR(ctx)) { 596 kfree(data); 597 return PTR_ERR(ctx); 598 } 599 600 switch (prog->type) { 601 case BPF_PROG_TYPE_SCHED_CLS: 602 case BPF_PROG_TYPE_SCHED_ACT: 603 is_l2 = true; 604 fallthrough; 605 case BPF_PROG_TYPE_LWT_IN: 606 case BPF_PROG_TYPE_LWT_OUT: 607 case BPF_PROG_TYPE_LWT_XMIT: 608 is_direct_pkt_access = true; 609 break; 610 default: 611 break; 612 } 613 614 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1); 615 if (!sk) { 616 kfree(data); 617 kfree(ctx); 618 return -ENOMEM; 619 } 620 sock_init_data(NULL, sk); 621 622 skb = build_skb(data, 0); 623 if (!skb) { 624 kfree(data); 625 kfree(ctx); 626 sk_free(sk); 627 return -ENOMEM; 628 } 629 skb->sk = sk; 630 631 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN); 632 __skb_put(skb, size); 633 if (ctx && ctx->ifindex > 1) { 634 dev = dev_get_by_index(net, ctx->ifindex); 635 if (!dev) { 636 ret = -ENODEV; 637 goto out; 638 } 639 } 640 skb->protocol = eth_type_trans(skb, dev); 641 skb_reset_network_header(skb); 642 643 switch (skb->protocol) { 644 case htons(ETH_P_IP): 645 sk->sk_family = AF_INET; 646 if (sizeof(struct iphdr) <= skb_headlen(skb)) { 647 sk->sk_rcv_saddr = ip_hdr(skb)->saddr; 648 sk->sk_daddr = ip_hdr(skb)->daddr; 649 } 650 break; 651 #if IS_ENABLED(CONFIG_IPV6) 652 case htons(ETH_P_IPV6): 653 sk->sk_family = AF_INET6; 654 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) { 655 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr; 656 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr; 657 } 658 break; 659 #endif 660 default: 661 break; 662 } 663 664 if (is_l2) 665 __skb_push(skb, hh_len); 666 if (is_direct_pkt_access) 667 bpf_compute_data_pointers(skb); 668 ret = convert___skb_to_skb(skb, ctx); 669 if (ret) 670 goto out; 671 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false); 672 if (ret) 673 goto out; 674 if (!is_l2) { 675 if (skb_headroom(skb) < hh_len) { 676 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb)); 677 678 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) { 679 ret = -ENOMEM; 680 goto out; 681 } 682 } 683 memset(__skb_push(skb, hh_len), 0, hh_len); 684 } 685 convert_skb_to___skb(skb, ctx); 686 687 size = skb->len; 688 /* bpf program can never convert linear skb to non-linear */ 689 if (WARN_ON_ONCE(skb_is_nonlinear(skb))) 690 size = skb_headlen(skb); 691 ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration); 692 if (!ret) 693 ret = bpf_ctx_finish(kattr, uattr, ctx, 694 sizeof(struct __sk_buff)); 695 out: 696 if (dev && dev != net->loopback_dev) 697 dev_put(dev); 698 kfree_skb(skb); 699 sk_free(sk); 700 kfree(ctx); 701 return ret; 702 } 703 704 static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp) 705 { 706 unsigned int ingress_ifindex, rx_queue_index; 707 struct netdev_rx_queue *rxqueue; 708 struct net_device *device; 709 710 if (!xdp_md) 711 return 0; 712 713 if (xdp_md->egress_ifindex != 0) 714 return -EINVAL; 715 716 ingress_ifindex = xdp_md->ingress_ifindex; 717 rx_queue_index = xdp_md->rx_queue_index; 718 719 if (!ingress_ifindex && rx_queue_index) 720 return -EINVAL; 721 722 if (ingress_ifindex) { 723 device = dev_get_by_index(current->nsproxy->net_ns, 724 ingress_ifindex); 725 if (!device) 726 return -ENODEV; 727 728 if (rx_queue_index >= device->real_num_rx_queues) 729 goto free_dev; 730 731 rxqueue = __netif_get_rx_queue(device, rx_queue_index); 732 733 if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq)) 734 goto free_dev; 735 736 xdp->rxq = &rxqueue->xdp_rxq; 737 /* The device is now tracked in the xdp->rxq for later 738 * dev_put() 739 */ 740 } 741 742 xdp->data = xdp->data_meta + xdp_md->data; 743 return 0; 744 745 free_dev: 746 dev_put(device); 747 return -EINVAL; 748 } 749 750 static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md) 751 { 752 if (!xdp_md) 753 return; 754 755 xdp_md->data = xdp->data - xdp->data_meta; 756 xdp_md->data_end = xdp->data_end - xdp->data_meta; 757 758 if (xdp_md->ingress_ifindex) 759 dev_put(xdp->rxq->dev); 760 } 761 762 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr, 763 union bpf_attr __user *uattr) 764 { 765 u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 766 u32 headroom = XDP_PACKET_HEADROOM; 767 u32 size = kattr->test.data_size_in; 768 u32 repeat = kattr->test.repeat; 769 struct netdev_rx_queue *rxqueue; 770 struct xdp_buff xdp = {}; 771 u32 retval, duration; 772 struct xdp_md *ctx; 773 u32 max_data_sz; 774 void *data; 775 int ret = -EINVAL; 776 777 if (prog->expected_attach_type == BPF_XDP_DEVMAP || 778 prog->expected_attach_type == BPF_XDP_CPUMAP) 779 return -EINVAL; 780 781 ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md)); 782 if (IS_ERR(ctx)) 783 return PTR_ERR(ctx); 784 785 if (ctx) { 786 /* There can't be user provided data before the meta data */ 787 if (ctx->data_meta || ctx->data_end != size || 788 ctx->data > ctx->data_end || 789 unlikely(xdp_metalen_invalid(ctx->data))) 790 goto free_ctx; 791 /* Meta data is allocated from the headroom */ 792 headroom -= ctx->data; 793 } 794 795 /* XDP have extra tailroom as (most) drivers use full page */ 796 max_data_sz = 4096 - headroom - tailroom; 797 798 data = bpf_test_init(kattr, max_data_sz, headroom, tailroom); 799 if (IS_ERR(data)) { 800 ret = PTR_ERR(data); 801 goto free_ctx; 802 } 803 804 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0); 805 xdp_init_buff(&xdp, headroom + max_data_sz + tailroom, 806 &rxqueue->xdp_rxq); 807 xdp_prepare_buff(&xdp, data, headroom, size, true); 808 809 ret = xdp_convert_md_to_buff(ctx, &xdp); 810 if (ret) 811 goto free_data; 812 813 if (repeat > 1) 814 bpf_prog_change_xdp(NULL, prog); 815 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true); 816 /* We convert the xdp_buff back to an xdp_md before checking the return 817 * code so the reference count of any held netdevice will be decremented 818 * even if the test run failed. 819 */ 820 xdp_convert_buff_to_md(&xdp, ctx); 821 if (ret) 822 goto out; 823 824 if (xdp.data_meta != data + headroom || 825 xdp.data_end != xdp.data_meta + size) 826 size = xdp.data_end - xdp.data_meta; 827 828 ret = bpf_test_finish(kattr, uattr, xdp.data_meta, size, retval, 829 duration); 830 if (!ret) 831 ret = bpf_ctx_finish(kattr, uattr, ctx, 832 sizeof(struct xdp_md)); 833 834 out: 835 if (repeat > 1) 836 bpf_prog_change_xdp(prog, NULL); 837 free_data: 838 kfree(data); 839 free_ctx: 840 kfree(ctx); 841 return ret; 842 } 843 844 static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx) 845 { 846 /* make sure the fields we don't use are zeroed */ 847 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags))) 848 return -EINVAL; 849 850 /* flags is allowed */ 851 852 if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags), 853 sizeof(struct bpf_flow_keys))) 854 return -EINVAL; 855 856 return 0; 857 } 858 859 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog, 860 const union bpf_attr *kattr, 861 union bpf_attr __user *uattr) 862 { 863 struct bpf_test_timer t = { NO_PREEMPT }; 864 u32 size = kattr->test.data_size_in; 865 struct bpf_flow_dissector ctx = {}; 866 u32 repeat = kattr->test.repeat; 867 struct bpf_flow_keys *user_ctx; 868 struct bpf_flow_keys flow_keys; 869 const struct ethhdr *eth; 870 unsigned int flags = 0; 871 u32 retval, duration; 872 void *data; 873 int ret; 874 875 if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR) 876 return -EINVAL; 877 878 if (kattr->test.flags || kattr->test.cpu) 879 return -EINVAL; 880 881 if (size < ETH_HLEN) 882 return -EINVAL; 883 884 data = bpf_test_init(kattr, size, 0, 0); 885 if (IS_ERR(data)) 886 return PTR_ERR(data); 887 888 eth = (struct ethhdr *)data; 889 890 if (!repeat) 891 repeat = 1; 892 893 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys)); 894 if (IS_ERR(user_ctx)) { 895 kfree(data); 896 return PTR_ERR(user_ctx); 897 } 898 if (user_ctx) { 899 ret = verify_user_bpf_flow_keys(user_ctx); 900 if (ret) 901 goto out; 902 flags = user_ctx->flags; 903 } 904 905 ctx.flow_keys = &flow_keys; 906 ctx.data = data; 907 ctx.data_end = (__u8 *)data + size; 908 909 bpf_test_timer_enter(&t); 910 do { 911 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN, 912 size, flags); 913 } while (bpf_test_timer_continue(&t, repeat, &ret, &duration)); 914 bpf_test_timer_leave(&t); 915 916 if (ret < 0) 917 goto out; 918 919 ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys), 920 retval, duration); 921 if (!ret) 922 ret = bpf_ctx_finish(kattr, uattr, user_ctx, 923 sizeof(struct bpf_flow_keys)); 924 925 out: 926 kfree(user_ctx); 927 kfree(data); 928 return ret; 929 } 930 931 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr, 932 union bpf_attr __user *uattr) 933 { 934 struct bpf_test_timer t = { NO_PREEMPT }; 935 struct bpf_prog_array *progs = NULL; 936 struct bpf_sk_lookup_kern ctx = {}; 937 u32 repeat = kattr->test.repeat; 938 struct bpf_sk_lookup *user_ctx; 939 u32 retval, duration; 940 int ret = -EINVAL; 941 942 if (prog->type != BPF_PROG_TYPE_SK_LOOKUP) 943 return -EINVAL; 944 945 if (kattr->test.flags || kattr->test.cpu) 946 return -EINVAL; 947 948 if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out || 949 kattr->test.data_size_out) 950 return -EINVAL; 951 952 if (!repeat) 953 repeat = 1; 954 955 user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx)); 956 if (IS_ERR(user_ctx)) 957 return PTR_ERR(user_ctx); 958 959 if (!user_ctx) 960 return -EINVAL; 961 962 if (user_ctx->sk) 963 goto out; 964 965 if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx))) 966 goto out; 967 968 if (user_ctx->local_port > U16_MAX || user_ctx->remote_port > U16_MAX) { 969 ret = -ERANGE; 970 goto out; 971 } 972 973 ctx.family = (u16)user_ctx->family; 974 ctx.protocol = (u16)user_ctx->protocol; 975 ctx.dport = (u16)user_ctx->local_port; 976 ctx.sport = (__force __be16)user_ctx->remote_port; 977 978 switch (ctx.family) { 979 case AF_INET: 980 ctx.v4.daddr = (__force __be32)user_ctx->local_ip4; 981 ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4; 982 break; 983 984 #if IS_ENABLED(CONFIG_IPV6) 985 case AF_INET6: 986 ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6; 987 ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6; 988 break; 989 #endif 990 991 default: 992 ret = -EAFNOSUPPORT; 993 goto out; 994 } 995 996 progs = bpf_prog_array_alloc(1, GFP_KERNEL); 997 if (!progs) { 998 ret = -ENOMEM; 999 goto out; 1000 } 1001 1002 progs->items[0].prog = prog; 1003 1004 bpf_test_timer_enter(&t); 1005 do { 1006 ctx.selected_sk = NULL; 1007 retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run); 1008 } while (bpf_test_timer_continue(&t, repeat, &ret, &duration)); 1009 bpf_test_timer_leave(&t); 1010 1011 if (ret < 0) 1012 goto out; 1013 1014 user_ctx->cookie = 0; 1015 if (ctx.selected_sk) { 1016 if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) { 1017 ret = -EOPNOTSUPP; 1018 goto out; 1019 } 1020 1021 user_ctx->cookie = sock_gen_cookie(ctx.selected_sk); 1022 } 1023 1024 ret = bpf_test_finish(kattr, uattr, NULL, 0, retval, duration); 1025 if (!ret) 1026 ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx)); 1027 1028 out: 1029 bpf_prog_array_free(progs); 1030 kfree(user_ctx); 1031 return ret; 1032 } 1033 1034 int bpf_prog_test_run_syscall(struct bpf_prog *prog, 1035 const union bpf_attr *kattr, 1036 union bpf_attr __user *uattr) 1037 { 1038 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in); 1039 __u32 ctx_size_in = kattr->test.ctx_size_in; 1040 void *ctx = NULL; 1041 u32 retval; 1042 int err = 0; 1043 1044 /* doesn't support data_in/out, ctx_out, duration, or repeat or flags */ 1045 if (kattr->test.data_in || kattr->test.data_out || 1046 kattr->test.ctx_out || kattr->test.duration || 1047 kattr->test.repeat || kattr->test.flags) 1048 return -EINVAL; 1049 1050 if (ctx_size_in < prog->aux->max_ctx_offset || 1051 ctx_size_in > U16_MAX) 1052 return -EINVAL; 1053 1054 if (ctx_size_in) { 1055 ctx = kzalloc(ctx_size_in, GFP_USER); 1056 if (!ctx) 1057 return -ENOMEM; 1058 if (copy_from_user(ctx, ctx_in, ctx_size_in)) { 1059 err = -EFAULT; 1060 goto out; 1061 } 1062 } 1063 1064 rcu_read_lock_trace(); 1065 retval = bpf_prog_run_pin_on_cpu(prog, ctx); 1066 rcu_read_unlock_trace(); 1067 1068 if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) { 1069 err = -EFAULT; 1070 goto out; 1071 } 1072 if (ctx_size_in) 1073 if (copy_to_user(ctx_in, ctx, ctx_size_in)) 1074 err = -EFAULT; 1075 out: 1076 kfree(ctx); 1077 return err; 1078 } 1079