1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/kernel.h> 3 #include <linux/errno.h> 4 #include <linux/file.h> 5 #include <linux/slab.h> 6 #include <linux/net.h> 7 #include <linux/compat.h> 8 #include <net/compat.h> 9 #include <linux/io_uring.h> 10 11 #include <uapi/linux/io_uring.h> 12 13 #include "io_uring.h" 14 #include "kbuf.h" 15 #include "alloc_cache.h" 16 #include "net.h" 17 #include "notif.h" 18 #include "rsrc.h" 19 20 #if defined(CONFIG_NET) 21 struct io_shutdown { 22 struct file *file; 23 int how; 24 }; 25 26 struct io_accept { 27 struct file *file; 28 struct sockaddr __user *addr; 29 int __user *addr_len; 30 int flags; 31 u32 file_slot; 32 unsigned long nofile; 33 }; 34 35 struct io_socket { 36 struct file *file; 37 int domain; 38 int type; 39 int protocol; 40 int flags; 41 u32 file_slot; 42 unsigned long nofile; 43 }; 44 45 struct io_connect { 46 struct file *file; 47 struct sockaddr __user *addr; 48 int addr_len; 49 }; 50 51 struct io_sr_msg { 52 struct file *file; 53 union { 54 struct compat_msghdr __user *umsg_compat; 55 struct user_msghdr __user *umsg; 56 void __user *buf; 57 }; 58 unsigned msg_flags; 59 unsigned flags; 60 size_t len; 61 size_t done_io; 62 }; 63 64 struct io_sendzc { 65 struct file *file; 66 void __user *buf; 67 size_t len; 68 unsigned msg_flags; 69 unsigned flags; 70 unsigned addr_len; 71 void __user *addr; 72 size_t done_io; 73 struct io_kiocb *notif; 74 }; 75 76 #define IO_APOLL_MULTI_POLLED (REQ_F_APOLL_MULTISHOT | REQ_F_POLLED) 77 78 int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 79 { 80 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 81 82 if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || 83 sqe->buf_index || sqe->splice_fd_in)) 84 return -EINVAL; 85 86 shutdown->how = READ_ONCE(sqe->len); 87 return 0; 88 } 89 90 int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) 91 { 92 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 93 struct socket *sock; 94 int ret; 95 96 if (issue_flags & IO_URING_F_NONBLOCK) 97 return -EAGAIN; 98 99 sock = sock_from_file(req->file); 100 if (unlikely(!sock)) 101 return -ENOTSOCK; 102 103 ret = __sys_shutdown_sock(sock, shutdown->how); 104 io_req_set_res(req, ret, 0); 105 return IOU_OK; 106 } 107 108 static bool io_net_retry(struct socket *sock, int flags) 109 { 110 if (!(flags & MSG_WAITALL)) 111 return false; 112 return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; 113 } 114 115 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) 116 { 117 struct io_async_msghdr *hdr = req->async_data; 118 119 if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) 120 return; 121 122 /* Let normal cleanup path reap it if we fail adding to the cache */ 123 if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { 124 req->async_data = NULL; 125 req->flags &= ~REQ_F_ASYNC_DATA; 126 } 127 } 128 129 static struct io_async_msghdr *io_recvmsg_alloc_async(struct io_kiocb *req, 130 unsigned int issue_flags) 131 { 132 struct io_ring_ctx *ctx = req->ctx; 133 struct io_cache_entry *entry; 134 135 if (!(issue_flags & IO_URING_F_UNLOCKED) && 136 (entry = io_alloc_cache_get(&ctx->netmsg_cache)) != NULL) { 137 struct io_async_msghdr *hdr; 138 139 hdr = container_of(entry, struct io_async_msghdr, cache); 140 req->flags |= REQ_F_ASYNC_DATA; 141 req->async_data = hdr; 142 return hdr; 143 } 144 145 if (!io_alloc_async_data(req)) 146 return req->async_data; 147 148 return NULL; 149 } 150 151 static int io_setup_async_msg(struct io_kiocb *req, 152 struct io_async_msghdr *kmsg, 153 unsigned int issue_flags) 154 { 155 struct io_async_msghdr *async_msg; 156 157 if (req_has_async_data(req)) 158 return -EAGAIN; 159 async_msg = io_recvmsg_alloc_async(req, issue_flags); 160 if (!async_msg) { 161 kfree(kmsg->free_iov); 162 return -ENOMEM; 163 } 164 req->flags |= REQ_F_NEED_CLEANUP; 165 memcpy(async_msg, kmsg, sizeof(*kmsg)); 166 async_msg->msg.msg_name = &async_msg->addr; 167 /* if were using fast_iov, set it to the new one */ 168 if (!async_msg->free_iov) 169 async_msg->msg.msg_iter.iov = async_msg->fast_iov; 170 171 return -EAGAIN; 172 } 173 174 static int io_sendmsg_copy_hdr(struct io_kiocb *req, 175 struct io_async_msghdr *iomsg) 176 { 177 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 178 179 iomsg->msg.msg_name = &iomsg->addr; 180 iomsg->free_iov = iomsg->fast_iov; 181 return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, 182 &iomsg->free_iov); 183 } 184 185 int io_sendzc_prep_async(struct io_kiocb *req) 186 { 187 struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc); 188 struct io_async_msghdr *io; 189 int ret; 190 191 if (!zc->addr || req_has_async_data(req)) 192 return 0; 193 if (io_alloc_async_data(req)) 194 return -ENOMEM; 195 196 io = req->async_data; 197 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); 198 return ret; 199 } 200 201 static int io_setup_async_addr(struct io_kiocb *req, 202 struct sockaddr_storage *addr, 203 unsigned int issue_flags) 204 { 205 struct io_async_msghdr *io; 206 207 if (!addr || req_has_async_data(req)) 208 return -EAGAIN; 209 if (io_alloc_async_data(req)) 210 return -ENOMEM; 211 io = req->async_data; 212 memcpy(&io->addr, addr, sizeof(io->addr)); 213 return -EAGAIN; 214 } 215 216 int io_sendmsg_prep_async(struct io_kiocb *req) 217 { 218 int ret; 219 220 ret = io_sendmsg_copy_hdr(req, req->async_data); 221 if (!ret) 222 req->flags |= REQ_F_NEED_CLEANUP; 223 return ret; 224 } 225 226 void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) 227 { 228 struct io_async_msghdr *io = req->async_data; 229 230 kfree(io->free_iov); 231 } 232 233 int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 234 { 235 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 236 237 if (unlikely(sqe->file_index || sqe->addr2)) 238 return -EINVAL; 239 240 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 241 sr->len = READ_ONCE(sqe->len); 242 sr->flags = READ_ONCE(sqe->ioprio); 243 if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) 244 return -EINVAL; 245 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 246 if (sr->msg_flags & MSG_DONTWAIT) 247 req->flags |= REQ_F_NOWAIT; 248 249 #ifdef CONFIG_COMPAT 250 if (req->ctx->compat) 251 sr->msg_flags |= MSG_CMSG_COMPAT; 252 #endif 253 sr->done_io = 0; 254 return 0; 255 } 256 257 int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) 258 { 259 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 260 struct io_async_msghdr iomsg, *kmsg; 261 struct socket *sock; 262 unsigned flags; 263 int min_ret = 0; 264 int ret; 265 266 sock = sock_from_file(req->file); 267 if (unlikely(!sock)) 268 return -ENOTSOCK; 269 270 if (req_has_async_data(req)) { 271 kmsg = req->async_data; 272 } else { 273 ret = io_sendmsg_copy_hdr(req, &iomsg); 274 if (ret) 275 return ret; 276 kmsg = &iomsg; 277 } 278 279 if (!(req->flags & REQ_F_POLLED) && 280 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 281 return io_setup_async_msg(req, kmsg, issue_flags); 282 283 flags = sr->msg_flags; 284 if (issue_flags & IO_URING_F_NONBLOCK) 285 flags |= MSG_DONTWAIT; 286 if (flags & MSG_WAITALL) 287 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 288 289 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 290 291 if (ret < min_ret) { 292 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 293 return io_setup_async_msg(req, kmsg, issue_flags); 294 if (ret == -ERESTARTSYS) 295 ret = -EINTR; 296 if (ret > 0 && io_net_retry(sock, flags)) { 297 sr->done_io += ret; 298 req->flags |= REQ_F_PARTIAL_IO; 299 return io_setup_async_msg(req, kmsg, issue_flags); 300 } 301 req_set_fail(req); 302 } 303 /* fast path, check for non-NULL to avoid function call */ 304 if (kmsg->free_iov) 305 kfree(kmsg->free_iov); 306 req->flags &= ~REQ_F_NEED_CLEANUP; 307 io_netmsg_recycle(req, issue_flags); 308 if (ret >= 0) 309 ret += sr->done_io; 310 else if (sr->done_io) 311 ret = sr->done_io; 312 io_req_set_res(req, ret, 0); 313 return IOU_OK; 314 } 315 316 int io_send(struct io_kiocb *req, unsigned int issue_flags) 317 { 318 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 319 struct msghdr msg; 320 struct iovec iov; 321 struct socket *sock; 322 unsigned flags; 323 int min_ret = 0; 324 int ret; 325 326 if (!(req->flags & REQ_F_POLLED) && 327 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 328 return -EAGAIN; 329 330 sock = sock_from_file(req->file); 331 if (unlikely(!sock)) 332 return -ENOTSOCK; 333 334 ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); 335 if (unlikely(ret)) 336 return ret; 337 338 msg.msg_name = NULL; 339 msg.msg_control = NULL; 340 msg.msg_controllen = 0; 341 msg.msg_namelen = 0; 342 msg.msg_ubuf = NULL; 343 344 flags = sr->msg_flags; 345 if (issue_flags & IO_URING_F_NONBLOCK) 346 flags |= MSG_DONTWAIT; 347 if (flags & MSG_WAITALL) 348 min_ret = iov_iter_count(&msg.msg_iter); 349 350 msg.msg_flags = flags; 351 ret = sock_sendmsg(sock, &msg); 352 if (ret < min_ret) { 353 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 354 return -EAGAIN; 355 if (ret == -ERESTARTSYS) 356 ret = -EINTR; 357 if (ret > 0 && io_net_retry(sock, flags)) { 358 sr->len -= ret; 359 sr->buf += ret; 360 sr->done_io += ret; 361 req->flags |= REQ_F_PARTIAL_IO; 362 return -EAGAIN; 363 } 364 req_set_fail(req); 365 } 366 if (ret >= 0) 367 ret += sr->done_io; 368 else if (sr->done_io) 369 ret = sr->done_io; 370 io_req_set_res(req, ret, 0); 371 return IOU_OK; 372 } 373 374 static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) 375 { 376 int hdr; 377 378 if (iomsg->namelen < 0) 379 return true; 380 if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), 381 iomsg->namelen, &hdr)) 382 return true; 383 if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) 384 return true; 385 386 return false; 387 } 388 389 static int __io_recvmsg_copy_hdr(struct io_kiocb *req, 390 struct io_async_msghdr *iomsg) 391 { 392 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 393 struct user_msghdr msg; 394 int ret; 395 396 if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) 397 return -EFAULT; 398 399 ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 400 if (ret) 401 return ret; 402 403 if (req->flags & REQ_F_BUFFER_SELECT) { 404 if (msg.msg_iovlen == 0) { 405 sr->len = iomsg->fast_iov[0].iov_len = 0; 406 iomsg->fast_iov[0].iov_base = NULL; 407 iomsg->free_iov = NULL; 408 } else if (msg.msg_iovlen > 1) { 409 return -EINVAL; 410 } else { 411 if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) 412 return -EFAULT; 413 sr->len = iomsg->fast_iov[0].iov_len; 414 iomsg->free_iov = NULL; 415 } 416 417 if (req->flags & REQ_F_APOLL_MULTISHOT) { 418 iomsg->namelen = msg.msg_namelen; 419 iomsg->controllen = msg.msg_controllen; 420 if (io_recvmsg_multishot_overflow(iomsg)) 421 return -EOVERFLOW; 422 } 423 } else { 424 iomsg->free_iov = iomsg->fast_iov; 425 ret = __import_iovec(READ, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, 426 &iomsg->free_iov, &iomsg->msg.msg_iter, 427 false); 428 if (ret > 0) 429 ret = 0; 430 } 431 432 return ret; 433 } 434 435 #ifdef CONFIG_COMPAT 436 static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, 437 struct io_async_msghdr *iomsg) 438 { 439 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 440 struct compat_msghdr msg; 441 struct compat_iovec __user *uiov; 442 int ret; 443 444 if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) 445 return -EFAULT; 446 447 ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 448 if (ret) 449 return ret; 450 451 uiov = compat_ptr(msg.msg_iov); 452 if (req->flags & REQ_F_BUFFER_SELECT) { 453 compat_ssize_t clen; 454 455 if (msg.msg_iovlen == 0) { 456 sr->len = 0; 457 iomsg->free_iov = NULL; 458 } else if (msg.msg_iovlen > 1) { 459 return -EINVAL; 460 } else { 461 if (!access_ok(uiov, sizeof(*uiov))) 462 return -EFAULT; 463 if (__get_user(clen, &uiov->iov_len)) 464 return -EFAULT; 465 if (clen < 0) 466 return -EINVAL; 467 sr->len = clen; 468 iomsg->free_iov = NULL; 469 } 470 471 if (req->flags & REQ_F_APOLL_MULTISHOT) { 472 iomsg->namelen = msg.msg_namelen; 473 iomsg->controllen = msg.msg_controllen; 474 if (io_recvmsg_multishot_overflow(iomsg)) 475 return -EOVERFLOW; 476 } 477 } else { 478 iomsg->free_iov = iomsg->fast_iov; 479 ret = __import_iovec(READ, (struct iovec __user *)uiov, msg.msg_iovlen, 480 UIO_FASTIOV, &iomsg->free_iov, 481 &iomsg->msg.msg_iter, true); 482 if (ret < 0) 483 return ret; 484 } 485 486 return 0; 487 } 488 #endif 489 490 static int io_recvmsg_copy_hdr(struct io_kiocb *req, 491 struct io_async_msghdr *iomsg) 492 { 493 iomsg->msg.msg_name = &iomsg->addr; 494 495 #ifdef CONFIG_COMPAT 496 if (req->ctx->compat) 497 return __io_compat_recvmsg_copy_hdr(req, iomsg); 498 #endif 499 500 return __io_recvmsg_copy_hdr(req, iomsg); 501 } 502 503 int io_recvmsg_prep_async(struct io_kiocb *req) 504 { 505 int ret; 506 507 ret = io_recvmsg_copy_hdr(req, req->async_data); 508 if (!ret) 509 req->flags |= REQ_F_NEED_CLEANUP; 510 return ret; 511 } 512 513 #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) 514 515 int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 516 { 517 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 518 519 if (unlikely(sqe->file_index || sqe->addr2)) 520 return -EINVAL; 521 522 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 523 sr->len = READ_ONCE(sqe->len); 524 sr->flags = READ_ONCE(sqe->ioprio); 525 if (sr->flags & ~(RECVMSG_FLAGS)) 526 return -EINVAL; 527 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 528 if (sr->msg_flags & MSG_DONTWAIT) 529 req->flags |= REQ_F_NOWAIT; 530 if (sr->msg_flags & MSG_ERRQUEUE) 531 req->flags |= REQ_F_CLEAR_POLLIN; 532 if (sr->flags & IORING_RECV_MULTISHOT) { 533 if (!(req->flags & REQ_F_BUFFER_SELECT)) 534 return -EINVAL; 535 if (sr->msg_flags & MSG_WAITALL) 536 return -EINVAL; 537 if (req->opcode == IORING_OP_RECV && sr->len) 538 return -EINVAL; 539 req->flags |= REQ_F_APOLL_MULTISHOT; 540 } 541 542 #ifdef CONFIG_COMPAT 543 if (req->ctx->compat) 544 sr->msg_flags |= MSG_CMSG_COMPAT; 545 #endif 546 sr->done_io = 0; 547 return 0; 548 } 549 550 static inline void io_recv_prep_retry(struct io_kiocb *req) 551 { 552 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 553 554 sr->done_io = 0; 555 sr->len = 0; /* get from the provided buffer */ 556 } 557 558 /* 559 * Finishes io_recv and io_recvmsg. 560 * 561 * Returns true if it is actually finished, or false if it should run 562 * again (for multishot). 563 */ 564 static inline bool io_recv_finish(struct io_kiocb *req, int *ret, 565 unsigned int cflags, bool mshot_finished) 566 { 567 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 568 io_req_set_res(req, *ret, cflags); 569 *ret = IOU_OK; 570 return true; 571 } 572 573 if (!mshot_finished) { 574 if (io_post_aux_cqe(req->ctx, req->cqe.user_data, *ret, 575 cflags | IORING_CQE_F_MORE, false)) { 576 io_recv_prep_retry(req); 577 return false; 578 } 579 /* 580 * Otherwise stop multishot but use the current result. 581 * Probably will end up going into overflow, but this means 582 * we cannot trust the ordering anymore 583 */ 584 } 585 586 io_req_set_res(req, *ret, cflags); 587 588 if (req->flags & REQ_F_POLLED) 589 *ret = IOU_STOP_MULTISHOT; 590 else 591 *ret = IOU_OK; 592 return true; 593 } 594 595 static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg, 596 struct io_sr_msg *sr, void __user **buf, 597 size_t *len) 598 { 599 unsigned long ubuf = (unsigned long) *buf; 600 unsigned long hdr; 601 602 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 603 kmsg->controllen; 604 if (*len < hdr) 605 return -EFAULT; 606 607 if (kmsg->controllen) { 608 unsigned long control = ubuf + hdr - kmsg->controllen; 609 610 kmsg->msg.msg_control_user = (void __user *) control; 611 kmsg->msg.msg_controllen = kmsg->controllen; 612 } 613 614 sr->buf = *buf; /* stash for later copy */ 615 *buf = (void __user *) (ubuf + hdr); 616 kmsg->payloadlen = *len = *len - hdr; 617 return 0; 618 } 619 620 struct io_recvmsg_multishot_hdr { 621 struct io_uring_recvmsg_out msg; 622 struct sockaddr_storage addr; 623 }; 624 625 static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io, 626 struct io_async_msghdr *kmsg, 627 unsigned int flags, bool *finished) 628 { 629 int err; 630 int copy_len; 631 struct io_recvmsg_multishot_hdr hdr; 632 633 if (kmsg->namelen) 634 kmsg->msg.msg_name = &hdr.addr; 635 kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 636 kmsg->msg.msg_namelen = 0; 637 638 if (sock->file->f_flags & O_NONBLOCK) 639 flags |= MSG_DONTWAIT; 640 641 err = sock_recvmsg(sock, &kmsg->msg, flags); 642 *finished = err <= 0; 643 if (err < 0) 644 return err; 645 646 hdr.msg = (struct io_uring_recvmsg_out) { 647 .controllen = kmsg->controllen - kmsg->msg.msg_controllen, 648 .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT 649 }; 650 651 hdr.msg.payloadlen = err; 652 if (err > kmsg->payloadlen) 653 err = kmsg->payloadlen; 654 655 copy_len = sizeof(struct io_uring_recvmsg_out); 656 if (kmsg->msg.msg_namelen > kmsg->namelen) 657 copy_len += kmsg->namelen; 658 else 659 copy_len += kmsg->msg.msg_namelen; 660 661 /* 662 * "fromlen shall refer to the value before truncation.." 663 * 1003.1g 664 */ 665 hdr.msg.namelen = kmsg->msg.msg_namelen; 666 667 /* ensure that there is no gap between hdr and sockaddr_storage */ 668 BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) != 669 sizeof(struct io_uring_recvmsg_out)); 670 if (copy_to_user(io->buf, &hdr, copy_len)) { 671 *finished = true; 672 return -EFAULT; 673 } 674 675 return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 676 kmsg->controllen + err; 677 } 678 679 int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) 680 { 681 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 682 struct io_async_msghdr iomsg, *kmsg; 683 struct socket *sock; 684 unsigned int cflags; 685 unsigned flags; 686 int ret, min_ret = 0; 687 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 688 bool mshot_finished = true; 689 690 sock = sock_from_file(req->file); 691 if (unlikely(!sock)) 692 return -ENOTSOCK; 693 694 if (req_has_async_data(req)) { 695 kmsg = req->async_data; 696 } else { 697 ret = io_recvmsg_copy_hdr(req, &iomsg); 698 if (ret) 699 return ret; 700 kmsg = &iomsg; 701 } 702 703 if (!(req->flags & REQ_F_POLLED) && 704 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 705 return io_setup_async_msg(req, kmsg, issue_flags); 706 707 retry_multishot: 708 if (io_do_buffer_select(req)) { 709 void __user *buf; 710 size_t len = sr->len; 711 712 buf = io_buffer_select(req, &len, issue_flags); 713 if (!buf) 714 return -ENOBUFS; 715 716 if (req->flags & REQ_F_APOLL_MULTISHOT) { 717 ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); 718 if (ret) { 719 io_kbuf_recycle(req, issue_flags); 720 return ret; 721 } 722 } 723 724 kmsg->fast_iov[0].iov_base = buf; 725 kmsg->fast_iov[0].iov_len = len; 726 iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, 1, 727 len); 728 } 729 730 flags = sr->msg_flags; 731 if (force_nonblock) 732 flags |= MSG_DONTWAIT; 733 if (flags & MSG_WAITALL) 734 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 735 736 kmsg->msg.msg_get_inq = 1; 737 if (req->flags & REQ_F_APOLL_MULTISHOT) 738 ret = io_recvmsg_multishot(sock, sr, kmsg, flags, 739 &mshot_finished); 740 else 741 ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, 742 kmsg->uaddr, flags); 743 744 if (ret < min_ret) { 745 if (ret == -EAGAIN && force_nonblock) { 746 ret = io_setup_async_msg(req, kmsg, issue_flags); 747 if (ret == -EAGAIN && (req->flags & IO_APOLL_MULTI_POLLED) == 748 IO_APOLL_MULTI_POLLED) { 749 io_kbuf_recycle(req, issue_flags); 750 return IOU_ISSUE_SKIP_COMPLETE; 751 } 752 return ret; 753 } 754 if (ret == -ERESTARTSYS) 755 ret = -EINTR; 756 if (ret > 0 && io_net_retry(sock, flags)) { 757 sr->done_io += ret; 758 req->flags |= REQ_F_PARTIAL_IO; 759 return io_setup_async_msg(req, kmsg, issue_flags); 760 } 761 req_set_fail(req); 762 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 763 req_set_fail(req); 764 } 765 766 if (ret > 0) 767 ret += sr->done_io; 768 else if (sr->done_io) 769 ret = sr->done_io; 770 else 771 io_kbuf_recycle(req, issue_flags); 772 773 cflags = io_put_kbuf(req, issue_flags); 774 if (kmsg->msg.msg_inq) 775 cflags |= IORING_CQE_F_SOCK_NONEMPTY; 776 777 if (!io_recv_finish(req, &ret, cflags, mshot_finished)) 778 goto retry_multishot; 779 780 if (mshot_finished) { 781 io_netmsg_recycle(req, issue_flags); 782 /* fast path, check for non-NULL to avoid function call */ 783 if (kmsg->free_iov) 784 kfree(kmsg->free_iov); 785 req->flags &= ~REQ_F_NEED_CLEANUP; 786 } 787 788 return ret; 789 } 790 791 int io_recv(struct io_kiocb *req, unsigned int issue_flags) 792 { 793 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 794 struct msghdr msg; 795 struct socket *sock; 796 struct iovec iov; 797 unsigned int cflags; 798 unsigned flags; 799 int ret, min_ret = 0; 800 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 801 size_t len = sr->len; 802 803 if (!(req->flags & REQ_F_POLLED) && 804 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 805 return -EAGAIN; 806 807 sock = sock_from_file(req->file); 808 if (unlikely(!sock)) 809 return -ENOTSOCK; 810 811 retry_multishot: 812 if (io_do_buffer_select(req)) { 813 void __user *buf; 814 815 buf = io_buffer_select(req, &len, issue_flags); 816 if (!buf) 817 return -ENOBUFS; 818 sr->buf = buf; 819 } 820 821 ret = import_single_range(READ, sr->buf, len, &iov, &msg.msg_iter); 822 if (unlikely(ret)) 823 goto out_free; 824 825 msg.msg_name = NULL; 826 msg.msg_namelen = 0; 827 msg.msg_control = NULL; 828 msg.msg_get_inq = 1; 829 msg.msg_flags = 0; 830 msg.msg_controllen = 0; 831 msg.msg_iocb = NULL; 832 msg.msg_ubuf = NULL; 833 834 flags = sr->msg_flags; 835 if (force_nonblock) 836 flags |= MSG_DONTWAIT; 837 if (flags & MSG_WAITALL) 838 min_ret = iov_iter_count(&msg.msg_iter); 839 840 ret = sock_recvmsg(sock, &msg, flags); 841 if (ret < min_ret) { 842 if (ret == -EAGAIN && force_nonblock) { 843 if ((req->flags & IO_APOLL_MULTI_POLLED) == IO_APOLL_MULTI_POLLED) { 844 io_kbuf_recycle(req, issue_flags); 845 return IOU_ISSUE_SKIP_COMPLETE; 846 } 847 848 return -EAGAIN; 849 } 850 if (ret == -ERESTARTSYS) 851 ret = -EINTR; 852 if (ret > 0 && io_net_retry(sock, flags)) { 853 sr->len -= ret; 854 sr->buf += ret; 855 sr->done_io += ret; 856 req->flags |= REQ_F_PARTIAL_IO; 857 return -EAGAIN; 858 } 859 req_set_fail(req); 860 } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 861 out_free: 862 req_set_fail(req); 863 } 864 865 if (ret > 0) 866 ret += sr->done_io; 867 else if (sr->done_io) 868 ret = sr->done_io; 869 else 870 io_kbuf_recycle(req, issue_flags); 871 872 cflags = io_put_kbuf(req, issue_flags); 873 if (msg.msg_inq) 874 cflags |= IORING_CQE_F_SOCK_NONEMPTY; 875 876 if (!io_recv_finish(req, &ret, cflags, ret <= 0)) 877 goto retry_multishot; 878 879 return ret; 880 } 881 882 void io_sendzc_cleanup(struct io_kiocb *req) 883 { 884 struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc); 885 886 zc->notif->flags |= REQ_F_CQE_SKIP; 887 io_notif_flush(zc->notif); 888 zc->notif = NULL; 889 } 890 891 int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 892 { 893 struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc); 894 struct io_ring_ctx *ctx = req->ctx; 895 struct io_kiocb *notif; 896 897 if (READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3) || 898 READ_ONCE(sqe->__pad3[0])) 899 return -EINVAL; 900 /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */ 901 if (req->flags & REQ_F_CQE_SKIP) 902 return -EINVAL; 903 904 zc->flags = READ_ONCE(sqe->ioprio); 905 if (zc->flags & ~(IORING_RECVSEND_POLL_FIRST | 906 IORING_RECVSEND_FIXED_BUF)) 907 return -EINVAL; 908 notif = zc->notif = io_alloc_notif(ctx); 909 if (!notif) 910 return -ENOMEM; 911 notif->cqe.user_data = req->cqe.user_data; 912 notif->cqe.res = 0; 913 notif->cqe.flags = IORING_CQE_F_NOTIF; 914 req->flags |= REQ_F_NEED_CLEANUP; 915 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 916 unsigned idx = READ_ONCE(sqe->buf_index); 917 918 if (unlikely(idx >= ctx->nr_user_bufs)) 919 return -EFAULT; 920 idx = array_index_nospec(idx, ctx->nr_user_bufs); 921 req->imu = READ_ONCE(ctx->user_bufs[idx]); 922 io_req_set_rsrc_node(notif, ctx, 0); 923 } 924 925 zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); 926 zc->len = READ_ONCE(sqe->len); 927 zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 928 if (zc->msg_flags & MSG_DONTWAIT) 929 req->flags |= REQ_F_NOWAIT; 930 931 zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 932 zc->addr_len = READ_ONCE(sqe->addr_len); 933 zc->done_io = 0; 934 935 #ifdef CONFIG_COMPAT 936 if (req->ctx->compat) 937 zc->msg_flags |= MSG_CMSG_COMPAT; 938 #endif 939 return 0; 940 } 941 942 static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, 943 struct iov_iter *from, size_t length) 944 { 945 struct skb_shared_info *shinfo = skb_shinfo(skb); 946 int frag = shinfo->nr_frags; 947 int ret = 0; 948 struct bvec_iter bi; 949 ssize_t copied = 0; 950 unsigned long truesize = 0; 951 952 if (!shinfo->nr_frags) 953 shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; 954 955 if (!skb_zcopy_managed(skb) || !iov_iter_is_bvec(from)) { 956 skb_zcopy_downgrade_managed(skb); 957 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 958 } 959 960 bi.bi_size = min(from->count, length); 961 bi.bi_bvec_done = from->iov_offset; 962 bi.bi_idx = 0; 963 964 while (bi.bi_size && frag < MAX_SKB_FRAGS) { 965 struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); 966 967 copied += v.bv_len; 968 truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); 969 __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, 970 v.bv_offset, v.bv_len); 971 bvec_iter_advance_single(from->bvec, &bi, v.bv_len); 972 } 973 if (bi.bi_size) 974 ret = -EMSGSIZE; 975 976 shinfo->nr_frags = frag; 977 from->bvec += bi.bi_idx; 978 from->nr_segs -= bi.bi_idx; 979 from->count -= copied; 980 from->iov_offset = bi.bi_bvec_done; 981 982 skb->data_len += copied; 983 skb->len += copied; 984 skb->truesize += truesize; 985 986 if (sk && sk->sk_type == SOCK_STREAM) { 987 sk_wmem_queued_add(sk, truesize); 988 if (!skb_zcopy_pure(skb)) 989 sk_mem_charge(sk, truesize); 990 } else { 991 refcount_add(truesize, &skb->sk->sk_wmem_alloc); 992 } 993 return ret; 994 } 995 996 int io_sendzc(struct io_kiocb *req, unsigned int issue_flags) 997 { 998 struct sockaddr_storage __address, *addr = NULL; 999 struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc); 1000 struct msghdr msg; 1001 struct iovec iov; 1002 struct socket *sock; 1003 unsigned msg_flags, cflags; 1004 int ret, min_ret = 0; 1005 1006 sock = sock_from_file(req->file); 1007 if (unlikely(!sock)) 1008 return -ENOTSOCK; 1009 1010 msg.msg_name = NULL; 1011 msg.msg_control = NULL; 1012 msg.msg_controllen = 0; 1013 msg.msg_namelen = 0; 1014 1015 if (zc->addr) { 1016 if (req_has_async_data(req)) { 1017 struct io_async_msghdr *io = req->async_data; 1018 1019 msg.msg_name = addr = &io->addr; 1020 } else { 1021 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); 1022 if (unlikely(ret < 0)) 1023 return ret; 1024 msg.msg_name = (struct sockaddr *)&__address; 1025 addr = &__address; 1026 } 1027 msg.msg_namelen = zc->addr_len; 1028 } 1029 1030 if (!(req->flags & REQ_F_POLLED) && 1031 (zc->flags & IORING_RECVSEND_POLL_FIRST)) 1032 return io_setup_async_addr(req, addr, issue_flags); 1033 1034 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 1035 ret = io_import_fixed(WRITE, &msg.msg_iter, req->imu, 1036 (u64)(uintptr_t)zc->buf, zc->len); 1037 if (unlikely(ret)) 1038 return ret; 1039 } else { 1040 ret = import_single_range(WRITE, zc->buf, zc->len, &iov, 1041 &msg.msg_iter); 1042 if (unlikely(ret)) 1043 return ret; 1044 ret = io_notif_account_mem(zc->notif, zc->len); 1045 if (unlikely(ret)) 1046 return ret; 1047 } 1048 1049 msg_flags = zc->msg_flags | MSG_ZEROCOPY; 1050 if (issue_flags & IO_URING_F_NONBLOCK) 1051 msg_flags |= MSG_DONTWAIT; 1052 if (msg_flags & MSG_WAITALL) 1053 min_ret = iov_iter_count(&msg.msg_iter); 1054 1055 msg.msg_flags = msg_flags; 1056 msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; 1057 msg.sg_from_iter = io_sg_from_iter; 1058 ret = sock_sendmsg(sock, &msg); 1059 1060 if (unlikely(ret < min_ret)) { 1061 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1062 return io_setup_async_addr(req, addr, issue_flags); 1063 1064 if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { 1065 zc->len -= ret; 1066 zc->buf += ret; 1067 zc->done_io += ret; 1068 req->flags |= REQ_F_PARTIAL_IO; 1069 return io_setup_async_addr(req, addr, issue_flags); 1070 } 1071 if (ret < 0 && !zc->done_io) 1072 zc->notif->flags |= REQ_F_CQE_SKIP; 1073 if (ret == -ERESTARTSYS) 1074 ret = -EINTR; 1075 req_set_fail(req); 1076 } 1077 1078 if (ret >= 0) 1079 ret += zc->done_io; 1080 else if (zc->done_io) 1081 ret = zc->done_io; 1082 1083 io_notif_flush(zc->notif); 1084 req->flags &= ~REQ_F_NEED_CLEANUP; 1085 cflags = ret >= 0 ? IORING_CQE_F_MORE : 0; 1086 io_req_set_res(req, ret, cflags); 1087 return IOU_OK; 1088 } 1089 1090 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1091 { 1092 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1093 unsigned flags; 1094 1095 if (sqe->len || sqe->buf_index) 1096 return -EINVAL; 1097 1098 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1099 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 1100 accept->flags = READ_ONCE(sqe->accept_flags); 1101 accept->nofile = rlimit(RLIMIT_NOFILE); 1102 flags = READ_ONCE(sqe->ioprio); 1103 if (flags & ~IORING_ACCEPT_MULTISHOT) 1104 return -EINVAL; 1105 1106 accept->file_slot = READ_ONCE(sqe->file_index); 1107 if (accept->file_slot) { 1108 if (accept->flags & SOCK_CLOEXEC) 1109 return -EINVAL; 1110 if (flags & IORING_ACCEPT_MULTISHOT && 1111 accept->file_slot != IORING_FILE_INDEX_ALLOC) 1112 return -EINVAL; 1113 } 1114 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1115 return -EINVAL; 1116 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) 1117 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1118 if (flags & IORING_ACCEPT_MULTISHOT) 1119 req->flags |= REQ_F_APOLL_MULTISHOT; 1120 return 0; 1121 } 1122 1123 int io_accept(struct io_kiocb *req, unsigned int issue_flags) 1124 { 1125 struct io_ring_ctx *ctx = req->ctx; 1126 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1127 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1128 unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; 1129 bool fixed = !!accept->file_slot; 1130 struct file *file; 1131 int ret, fd; 1132 1133 retry: 1134 if (!fixed) { 1135 fd = __get_unused_fd_flags(accept->flags, accept->nofile); 1136 if (unlikely(fd < 0)) 1137 return fd; 1138 } 1139 file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, 1140 accept->flags); 1141 if (IS_ERR(file)) { 1142 if (!fixed) 1143 put_unused_fd(fd); 1144 ret = PTR_ERR(file); 1145 if (ret == -EAGAIN && force_nonblock) { 1146 /* 1147 * if it's multishot and polled, we don't need to 1148 * return EAGAIN to arm the poll infra since it 1149 * has already been done 1150 */ 1151 if ((req->flags & IO_APOLL_MULTI_POLLED) == 1152 IO_APOLL_MULTI_POLLED) 1153 ret = IOU_ISSUE_SKIP_COMPLETE; 1154 return ret; 1155 } 1156 if (ret == -ERESTARTSYS) 1157 ret = -EINTR; 1158 req_set_fail(req); 1159 } else if (!fixed) { 1160 fd_install(fd, file); 1161 ret = fd; 1162 } else { 1163 ret = io_fixed_fd_install(req, issue_flags, file, 1164 accept->file_slot); 1165 } 1166 1167 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 1168 io_req_set_res(req, ret, 0); 1169 return IOU_OK; 1170 } 1171 1172 if (ret >= 0 && 1173 io_post_aux_cqe(ctx, req->cqe.user_data, ret, IORING_CQE_F_MORE, false)) 1174 goto retry; 1175 1176 io_req_set_res(req, ret, 0); 1177 if (req->flags & REQ_F_POLLED) 1178 return IOU_STOP_MULTISHOT; 1179 return IOU_OK; 1180 } 1181 1182 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1183 { 1184 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1185 1186 if (sqe->addr || sqe->rw_flags || sqe->buf_index) 1187 return -EINVAL; 1188 1189 sock->domain = READ_ONCE(sqe->fd); 1190 sock->type = READ_ONCE(sqe->off); 1191 sock->protocol = READ_ONCE(sqe->len); 1192 sock->file_slot = READ_ONCE(sqe->file_index); 1193 sock->nofile = rlimit(RLIMIT_NOFILE); 1194 1195 sock->flags = sock->type & ~SOCK_TYPE_MASK; 1196 if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) 1197 return -EINVAL; 1198 if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1199 return -EINVAL; 1200 return 0; 1201 } 1202 1203 int io_socket(struct io_kiocb *req, unsigned int issue_flags) 1204 { 1205 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1206 bool fixed = !!sock->file_slot; 1207 struct file *file; 1208 int ret, fd; 1209 1210 if (!fixed) { 1211 fd = __get_unused_fd_flags(sock->flags, sock->nofile); 1212 if (unlikely(fd < 0)) 1213 return fd; 1214 } 1215 file = __sys_socket_file(sock->domain, sock->type, sock->protocol); 1216 if (IS_ERR(file)) { 1217 if (!fixed) 1218 put_unused_fd(fd); 1219 ret = PTR_ERR(file); 1220 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1221 return -EAGAIN; 1222 if (ret == -ERESTARTSYS) 1223 ret = -EINTR; 1224 req_set_fail(req); 1225 } else if (!fixed) { 1226 fd_install(fd, file); 1227 ret = fd; 1228 } else { 1229 ret = io_fixed_fd_install(req, issue_flags, file, 1230 sock->file_slot); 1231 } 1232 io_req_set_res(req, ret, 0); 1233 return IOU_OK; 1234 } 1235 1236 int io_connect_prep_async(struct io_kiocb *req) 1237 { 1238 struct io_async_connect *io = req->async_data; 1239 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1240 1241 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); 1242 } 1243 1244 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1245 { 1246 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1247 1248 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) 1249 return -EINVAL; 1250 1251 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1252 conn->addr_len = READ_ONCE(sqe->addr2); 1253 return 0; 1254 } 1255 1256 int io_connect(struct io_kiocb *req, unsigned int issue_flags) 1257 { 1258 struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); 1259 struct io_async_connect __io, *io; 1260 unsigned file_flags; 1261 int ret; 1262 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1263 1264 if (req_has_async_data(req)) { 1265 io = req->async_data; 1266 } else { 1267 ret = move_addr_to_kernel(connect->addr, 1268 connect->addr_len, 1269 &__io.address); 1270 if (ret) 1271 goto out; 1272 io = &__io; 1273 } 1274 1275 file_flags = force_nonblock ? O_NONBLOCK : 0; 1276 1277 ret = __sys_connect_file(req->file, &io->address, 1278 connect->addr_len, file_flags); 1279 if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { 1280 if (req_has_async_data(req)) 1281 return -EAGAIN; 1282 if (io_alloc_async_data(req)) { 1283 ret = -ENOMEM; 1284 goto out; 1285 } 1286 memcpy(req->async_data, &__io, sizeof(__io)); 1287 return -EAGAIN; 1288 } 1289 if (ret == -ERESTARTSYS) 1290 ret = -EINTR; 1291 out: 1292 if (ret < 0) 1293 req_set_fail(req); 1294 io_req_set_res(req, ret, 0); 1295 return IOU_OK; 1296 } 1297 1298 void io_netmsg_cache_free(struct io_cache_entry *entry) 1299 { 1300 kfree(container_of(entry, struct io_async_msghdr, cache)); 1301 } 1302 #endif 1303