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 bool in_progress; 50 bool seen_econnaborted; 51 }; 52 53 struct io_sr_msg { 54 struct file *file; 55 union { 56 struct compat_msghdr __user *umsg_compat; 57 struct user_msghdr __user *umsg; 58 void __user *buf; 59 }; 60 unsigned len; 61 unsigned done_io; 62 unsigned msg_flags; 63 u16 flags; 64 /* initialised and used only by !msg send variants */ 65 u16 addr_len; 66 u16 buf_group; 67 void __user *addr; 68 /* used only for send zerocopy */ 69 struct io_kiocb *notif; 70 }; 71 72 static inline bool io_check_multishot(struct io_kiocb *req, 73 unsigned int issue_flags) 74 { 75 /* 76 * When ->locked_cq is set we only allow to post CQEs from the original 77 * task context. Usual request completions will be handled in other 78 * generic paths but multipoll may decide to post extra cqes. 79 */ 80 return !(issue_flags & IO_URING_F_IOWQ) || 81 !(issue_flags & IO_URING_F_MULTISHOT) || 82 !req->ctx->task_complete; 83 } 84 85 int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 86 { 87 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 88 89 if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || 90 sqe->buf_index || sqe->splice_fd_in)) 91 return -EINVAL; 92 93 shutdown->how = READ_ONCE(sqe->len); 94 req->flags |= REQ_F_FORCE_ASYNC; 95 return 0; 96 } 97 98 int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) 99 { 100 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 101 struct socket *sock; 102 int ret; 103 104 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 105 106 sock = sock_from_file(req->file); 107 if (unlikely(!sock)) 108 return -ENOTSOCK; 109 110 ret = __sys_shutdown_sock(sock, shutdown->how); 111 io_req_set_res(req, ret, 0); 112 return IOU_OK; 113 } 114 115 static bool io_net_retry(struct socket *sock, int flags) 116 { 117 if (!(flags & MSG_WAITALL)) 118 return false; 119 return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; 120 } 121 122 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) 123 { 124 struct io_async_msghdr *hdr = req->async_data; 125 126 if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) 127 return; 128 129 /* Let normal cleanup path reap it if we fail adding to the cache */ 130 if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { 131 req->async_data = NULL; 132 req->flags &= ~REQ_F_ASYNC_DATA; 133 } 134 } 135 136 static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req, 137 unsigned int issue_flags) 138 { 139 struct io_ring_ctx *ctx = req->ctx; 140 struct io_cache_entry *entry; 141 struct io_async_msghdr *hdr; 142 143 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 144 entry = io_alloc_cache_get(&ctx->netmsg_cache); 145 if (entry) { 146 hdr = container_of(entry, struct io_async_msghdr, cache); 147 hdr->free_iov = NULL; 148 req->flags |= REQ_F_ASYNC_DATA; 149 req->async_data = hdr; 150 return hdr; 151 } 152 } 153 154 if (!io_alloc_async_data(req)) { 155 hdr = req->async_data; 156 hdr->free_iov = NULL; 157 return hdr; 158 } 159 return NULL; 160 } 161 162 static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req) 163 { 164 /* ->prep_async is always called from the submission context */ 165 return io_msg_alloc_async(req, 0); 166 } 167 168 static int io_setup_async_msg(struct io_kiocb *req, 169 struct io_async_msghdr *kmsg, 170 unsigned int issue_flags) 171 { 172 struct io_async_msghdr *async_msg; 173 174 if (req_has_async_data(req)) 175 return -EAGAIN; 176 async_msg = io_msg_alloc_async(req, issue_flags); 177 if (!async_msg) { 178 kfree(kmsg->free_iov); 179 return -ENOMEM; 180 } 181 req->flags |= REQ_F_NEED_CLEANUP; 182 memcpy(async_msg, kmsg, sizeof(*kmsg)); 183 if (async_msg->msg.msg_name) 184 async_msg->msg.msg_name = &async_msg->addr; 185 /* if were using fast_iov, set it to the new one */ 186 if (iter_is_iovec(&kmsg->msg.msg_iter) && !kmsg->free_iov) { 187 size_t fast_idx = iter_iov(&kmsg->msg.msg_iter) - kmsg->fast_iov; 188 async_msg->msg.msg_iter.__iov = &async_msg->fast_iov[fast_idx]; 189 } 190 191 return -EAGAIN; 192 } 193 194 static int io_sendmsg_copy_hdr(struct io_kiocb *req, 195 struct io_async_msghdr *iomsg) 196 { 197 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 198 199 iomsg->msg.msg_name = &iomsg->addr; 200 iomsg->free_iov = iomsg->fast_iov; 201 return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, 202 &iomsg->free_iov); 203 } 204 205 int io_send_prep_async(struct io_kiocb *req) 206 { 207 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 208 struct io_async_msghdr *io; 209 int ret; 210 211 if (!zc->addr || req_has_async_data(req)) 212 return 0; 213 io = io_msg_alloc_async_prep(req); 214 if (!io) 215 return -ENOMEM; 216 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); 217 return ret; 218 } 219 220 static int io_setup_async_addr(struct io_kiocb *req, 221 struct sockaddr_storage *addr_storage, 222 unsigned int issue_flags) 223 { 224 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 225 struct io_async_msghdr *io; 226 227 if (!sr->addr || req_has_async_data(req)) 228 return -EAGAIN; 229 io = io_msg_alloc_async(req, issue_flags); 230 if (!io) 231 return -ENOMEM; 232 memcpy(&io->addr, addr_storage, sizeof(io->addr)); 233 return -EAGAIN; 234 } 235 236 int io_sendmsg_prep_async(struct io_kiocb *req) 237 { 238 int ret; 239 240 if (!io_msg_alloc_async_prep(req)) 241 return -ENOMEM; 242 ret = io_sendmsg_copy_hdr(req, req->async_data); 243 if (!ret) 244 req->flags |= REQ_F_NEED_CLEANUP; 245 return ret; 246 } 247 248 void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) 249 { 250 struct io_async_msghdr *io = req->async_data; 251 252 kfree(io->free_iov); 253 } 254 255 int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 256 { 257 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 258 259 if (req->opcode == IORING_OP_SEND) { 260 if (READ_ONCE(sqe->__pad3[0])) 261 return -EINVAL; 262 sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 263 sr->addr_len = READ_ONCE(sqe->addr_len); 264 } else if (sqe->addr2 || sqe->file_index) { 265 return -EINVAL; 266 } 267 268 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 269 sr->len = READ_ONCE(sqe->len); 270 sr->flags = READ_ONCE(sqe->ioprio); 271 if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) 272 return -EINVAL; 273 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 274 if (sr->msg_flags & MSG_DONTWAIT) 275 req->flags |= REQ_F_NOWAIT; 276 277 #ifdef CONFIG_COMPAT 278 if (req->ctx->compat) 279 sr->msg_flags |= MSG_CMSG_COMPAT; 280 #endif 281 sr->done_io = 0; 282 return 0; 283 } 284 285 int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) 286 { 287 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 288 struct io_async_msghdr iomsg, *kmsg; 289 struct socket *sock; 290 unsigned flags; 291 int min_ret = 0; 292 int ret; 293 294 sock = sock_from_file(req->file); 295 if (unlikely(!sock)) 296 return -ENOTSOCK; 297 298 if (req_has_async_data(req)) { 299 kmsg = req->async_data; 300 } else { 301 ret = io_sendmsg_copy_hdr(req, &iomsg); 302 if (ret) 303 return ret; 304 kmsg = &iomsg; 305 } 306 307 if (!(req->flags & REQ_F_POLLED) && 308 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 309 return io_setup_async_msg(req, kmsg, issue_flags); 310 311 flags = sr->msg_flags; 312 if (issue_flags & IO_URING_F_NONBLOCK) 313 flags |= MSG_DONTWAIT; 314 if (flags & MSG_WAITALL) 315 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 316 317 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 318 319 if (ret < min_ret) { 320 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 321 return io_setup_async_msg(req, kmsg, issue_flags); 322 if (ret > 0 && io_net_retry(sock, flags)) { 323 sr->done_io += ret; 324 req->flags |= REQ_F_PARTIAL_IO; 325 return io_setup_async_msg(req, kmsg, issue_flags); 326 } 327 if (ret == -ERESTARTSYS) 328 ret = -EINTR; 329 req_set_fail(req); 330 } 331 /* fast path, check for non-NULL to avoid function call */ 332 if (kmsg->free_iov) 333 kfree(kmsg->free_iov); 334 req->flags &= ~REQ_F_NEED_CLEANUP; 335 io_netmsg_recycle(req, issue_flags); 336 if (ret >= 0) 337 ret += sr->done_io; 338 else if (sr->done_io) 339 ret = sr->done_io; 340 io_req_set_res(req, ret, 0); 341 return IOU_OK; 342 } 343 344 int io_send(struct io_kiocb *req, unsigned int issue_flags) 345 { 346 struct sockaddr_storage __address; 347 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 348 struct msghdr msg; 349 struct socket *sock; 350 unsigned flags; 351 int min_ret = 0; 352 int ret; 353 354 msg.msg_name = NULL; 355 msg.msg_control = NULL; 356 msg.msg_controllen = 0; 357 msg.msg_namelen = 0; 358 msg.msg_ubuf = NULL; 359 360 if (sr->addr) { 361 if (req_has_async_data(req)) { 362 struct io_async_msghdr *io = req->async_data; 363 364 msg.msg_name = &io->addr; 365 } else { 366 ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address); 367 if (unlikely(ret < 0)) 368 return ret; 369 msg.msg_name = (struct sockaddr *)&__address; 370 } 371 msg.msg_namelen = sr->addr_len; 372 } 373 374 if (!(req->flags & REQ_F_POLLED) && 375 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 376 return io_setup_async_addr(req, &__address, issue_flags); 377 378 sock = sock_from_file(req->file); 379 if (unlikely(!sock)) 380 return -ENOTSOCK; 381 382 ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter); 383 if (unlikely(ret)) 384 return ret; 385 386 flags = sr->msg_flags; 387 if (issue_flags & IO_URING_F_NONBLOCK) 388 flags |= MSG_DONTWAIT; 389 if (flags & MSG_WAITALL) 390 min_ret = iov_iter_count(&msg.msg_iter); 391 392 flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; 393 msg.msg_flags = flags; 394 ret = sock_sendmsg(sock, &msg); 395 if (ret < min_ret) { 396 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 397 return io_setup_async_addr(req, &__address, issue_flags); 398 399 if (ret > 0 && io_net_retry(sock, flags)) { 400 sr->len -= ret; 401 sr->buf += ret; 402 sr->done_io += ret; 403 req->flags |= REQ_F_PARTIAL_IO; 404 return io_setup_async_addr(req, &__address, issue_flags); 405 } 406 if (ret == -ERESTARTSYS) 407 ret = -EINTR; 408 req_set_fail(req); 409 } 410 if (ret >= 0) 411 ret += sr->done_io; 412 else if (sr->done_io) 413 ret = sr->done_io; 414 io_req_set_res(req, ret, 0); 415 return IOU_OK; 416 } 417 418 static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) 419 { 420 int hdr; 421 422 if (iomsg->namelen < 0) 423 return true; 424 if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), 425 iomsg->namelen, &hdr)) 426 return true; 427 if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) 428 return true; 429 430 return false; 431 } 432 433 static int __io_recvmsg_copy_hdr(struct io_kiocb *req, 434 struct io_async_msghdr *iomsg) 435 { 436 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 437 struct user_msghdr msg; 438 int ret; 439 440 if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) 441 return -EFAULT; 442 443 ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 444 if (ret) 445 return ret; 446 447 if (req->flags & REQ_F_BUFFER_SELECT) { 448 if (msg.msg_iovlen == 0) { 449 sr->len = iomsg->fast_iov[0].iov_len = 0; 450 iomsg->fast_iov[0].iov_base = NULL; 451 iomsg->free_iov = NULL; 452 } else if (msg.msg_iovlen > 1) { 453 return -EINVAL; 454 } else { 455 if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) 456 return -EFAULT; 457 sr->len = iomsg->fast_iov[0].iov_len; 458 iomsg->free_iov = NULL; 459 } 460 461 if (req->flags & REQ_F_APOLL_MULTISHOT) { 462 iomsg->namelen = msg.msg_namelen; 463 iomsg->controllen = msg.msg_controllen; 464 if (io_recvmsg_multishot_overflow(iomsg)) 465 return -EOVERFLOW; 466 } 467 } else { 468 iomsg->free_iov = iomsg->fast_iov; 469 ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, 470 &iomsg->free_iov, &iomsg->msg.msg_iter, 471 false); 472 if (ret > 0) 473 ret = 0; 474 } 475 476 return ret; 477 } 478 479 #ifdef CONFIG_COMPAT 480 static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, 481 struct io_async_msghdr *iomsg) 482 { 483 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 484 struct compat_msghdr msg; 485 struct compat_iovec __user *uiov; 486 int ret; 487 488 if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) 489 return -EFAULT; 490 491 ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 492 if (ret) 493 return ret; 494 495 uiov = compat_ptr(msg.msg_iov); 496 if (req->flags & REQ_F_BUFFER_SELECT) { 497 compat_ssize_t clen; 498 499 iomsg->free_iov = NULL; 500 if (msg.msg_iovlen == 0) { 501 sr->len = 0; 502 } else if (msg.msg_iovlen > 1) { 503 return -EINVAL; 504 } else { 505 if (!access_ok(uiov, sizeof(*uiov))) 506 return -EFAULT; 507 if (__get_user(clen, &uiov->iov_len)) 508 return -EFAULT; 509 if (clen < 0) 510 return -EINVAL; 511 sr->len = clen; 512 } 513 514 if (req->flags & REQ_F_APOLL_MULTISHOT) { 515 iomsg->namelen = msg.msg_namelen; 516 iomsg->controllen = msg.msg_controllen; 517 if (io_recvmsg_multishot_overflow(iomsg)) 518 return -EOVERFLOW; 519 } 520 } else { 521 iomsg->free_iov = iomsg->fast_iov; 522 ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen, 523 UIO_FASTIOV, &iomsg->free_iov, 524 &iomsg->msg.msg_iter, true); 525 if (ret < 0) 526 return ret; 527 } 528 529 return 0; 530 } 531 #endif 532 533 static int io_recvmsg_copy_hdr(struct io_kiocb *req, 534 struct io_async_msghdr *iomsg) 535 { 536 iomsg->msg.msg_name = &iomsg->addr; 537 538 #ifdef CONFIG_COMPAT 539 if (req->ctx->compat) 540 return __io_compat_recvmsg_copy_hdr(req, iomsg); 541 #endif 542 543 return __io_recvmsg_copy_hdr(req, iomsg); 544 } 545 546 int io_recvmsg_prep_async(struct io_kiocb *req) 547 { 548 int ret; 549 550 if (!io_msg_alloc_async_prep(req)) 551 return -ENOMEM; 552 ret = io_recvmsg_copy_hdr(req, req->async_data); 553 if (!ret) 554 req->flags |= REQ_F_NEED_CLEANUP; 555 return ret; 556 } 557 558 #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) 559 560 int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 561 { 562 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 563 564 if (unlikely(sqe->file_index || sqe->addr2)) 565 return -EINVAL; 566 567 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 568 sr->len = READ_ONCE(sqe->len); 569 sr->flags = READ_ONCE(sqe->ioprio); 570 if (sr->flags & ~(RECVMSG_FLAGS)) 571 return -EINVAL; 572 sr->msg_flags = READ_ONCE(sqe->msg_flags); 573 if (sr->msg_flags & MSG_DONTWAIT) 574 req->flags |= REQ_F_NOWAIT; 575 if (sr->msg_flags & MSG_ERRQUEUE) 576 req->flags |= REQ_F_CLEAR_POLLIN; 577 if (sr->flags & IORING_RECV_MULTISHOT) { 578 if (!(req->flags & REQ_F_BUFFER_SELECT)) 579 return -EINVAL; 580 if (sr->msg_flags & MSG_WAITALL) 581 return -EINVAL; 582 if (req->opcode == IORING_OP_RECV && sr->len) 583 return -EINVAL; 584 req->flags |= REQ_F_APOLL_MULTISHOT; 585 /* 586 * Store the buffer group for this multishot receive separately, 587 * as if we end up doing an io-wq based issue that selects a 588 * buffer, it has to be committed immediately and that will 589 * clear ->buf_list. This means we lose the link to the buffer 590 * list, and the eventual buffer put on completion then cannot 591 * restore it. 592 */ 593 sr->buf_group = req->buf_index; 594 } 595 596 #ifdef CONFIG_COMPAT 597 if (req->ctx->compat) 598 sr->msg_flags |= MSG_CMSG_COMPAT; 599 #endif 600 sr->done_io = 0; 601 return 0; 602 } 603 604 static inline void io_recv_prep_retry(struct io_kiocb *req) 605 { 606 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 607 608 sr->done_io = 0; 609 sr->len = 0; /* get from the provided buffer */ 610 req->buf_index = sr->buf_group; 611 } 612 613 /* 614 * Finishes io_recv and io_recvmsg. 615 * 616 * Returns true if it is actually finished, or false if it should run 617 * again (for multishot). 618 */ 619 static inline bool io_recv_finish(struct io_kiocb *req, int *ret, 620 unsigned int cflags, bool mshot_finished, 621 unsigned issue_flags) 622 { 623 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 624 io_req_set_res(req, *ret, cflags); 625 *ret = IOU_OK; 626 return true; 627 } 628 629 if (!mshot_finished) { 630 if (io_aux_cqe(req->ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, 631 req->cqe.user_data, *ret, cflags | IORING_CQE_F_MORE, true)) { 632 io_recv_prep_retry(req); 633 return false; 634 } 635 /* Otherwise stop multishot but use the current result. */ 636 } 637 638 io_req_set_res(req, *ret, cflags); 639 640 if (issue_flags & IO_URING_F_MULTISHOT) 641 *ret = IOU_STOP_MULTISHOT; 642 else 643 *ret = IOU_OK; 644 return true; 645 } 646 647 static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg, 648 struct io_sr_msg *sr, void __user **buf, 649 size_t *len) 650 { 651 unsigned long ubuf = (unsigned long) *buf; 652 unsigned long hdr; 653 654 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 655 kmsg->controllen; 656 if (*len < hdr) 657 return -EFAULT; 658 659 if (kmsg->controllen) { 660 unsigned long control = ubuf + hdr - kmsg->controllen; 661 662 kmsg->msg.msg_control_user = (void __user *) control; 663 kmsg->msg.msg_controllen = kmsg->controllen; 664 } 665 666 sr->buf = *buf; /* stash for later copy */ 667 *buf = (void __user *) (ubuf + hdr); 668 kmsg->payloadlen = *len = *len - hdr; 669 return 0; 670 } 671 672 struct io_recvmsg_multishot_hdr { 673 struct io_uring_recvmsg_out msg; 674 struct sockaddr_storage addr; 675 }; 676 677 static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io, 678 struct io_async_msghdr *kmsg, 679 unsigned int flags, bool *finished) 680 { 681 int err; 682 int copy_len; 683 struct io_recvmsg_multishot_hdr hdr; 684 685 if (kmsg->namelen) 686 kmsg->msg.msg_name = &hdr.addr; 687 kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 688 kmsg->msg.msg_namelen = 0; 689 690 if (sock->file->f_flags & O_NONBLOCK) 691 flags |= MSG_DONTWAIT; 692 693 err = sock_recvmsg(sock, &kmsg->msg, flags); 694 *finished = err <= 0; 695 if (err < 0) 696 return err; 697 698 hdr.msg = (struct io_uring_recvmsg_out) { 699 .controllen = kmsg->controllen - kmsg->msg.msg_controllen, 700 .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT 701 }; 702 703 hdr.msg.payloadlen = err; 704 if (err > kmsg->payloadlen) 705 err = kmsg->payloadlen; 706 707 copy_len = sizeof(struct io_uring_recvmsg_out); 708 if (kmsg->msg.msg_namelen > kmsg->namelen) 709 copy_len += kmsg->namelen; 710 else 711 copy_len += kmsg->msg.msg_namelen; 712 713 /* 714 * "fromlen shall refer to the value before truncation.." 715 * 1003.1g 716 */ 717 hdr.msg.namelen = kmsg->msg.msg_namelen; 718 719 /* ensure that there is no gap between hdr and sockaddr_storage */ 720 BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) != 721 sizeof(struct io_uring_recvmsg_out)); 722 if (copy_to_user(io->buf, &hdr, copy_len)) { 723 *finished = true; 724 return -EFAULT; 725 } 726 727 return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 728 kmsg->controllen + err; 729 } 730 731 int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) 732 { 733 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 734 struct io_async_msghdr iomsg, *kmsg; 735 struct socket *sock; 736 unsigned int cflags; 737 unsigned flags; 738 int ret, min_ret = 0; 739 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 740 bool mshot_finished = true; 741 742 sock = sock_from_file(req->file); 743 if (unlikely(!sock)) 744 return -ENOTSOCK; 745 746 if (req_has_async_data(req)) { 747 kmsg = req->async_data; 748 } else { 749 ret = io_recvmsg_copy_hdr(req, &iomsg); 750 if (ret) 751 return ret; 752 kmsg = &iomsg; 753 } 754 755 if (!(req->flags & REQ_F_POLLED) && 756 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 757 return io_setup_async_msg(req, kmsg, issue_flags); 758 759 if (!io_check_multishot(req, issue_flags)) 760 return io_setup_async_msg(req, kmsg, issue_flags); 761 762 retry_multishot: 763 if (io_do_buffer_select(req)) { 764 void __user *buf; 765 size_t len = sr->len; 766 767 buf = io_buffer_select(req, &len, issue_flags); 768 if (!buf) 769 return -ENOBUFS; 770 771 if (req->flags & REQ_F_APOLL_MULTISHOT) { 772 ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); 773 if (ret) { 774 io_kbuf_recycle(req, issue_flags); 775 return ret; 776 } 777 } 778 779 iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len); 780 } 781 782 flags = sr->msg_flags; 783 if (force_nonblock) 784 flags |= MSG_DONTWAIT; 785 if (flags & MSG_WAITALL) 786 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 787 788 kmsg->msg.msg_get_inq = 1; 789 if (req->flags & REQ_F_APOLL_MULTISHOT) 790 ret = io_recvmsg_multishot(sock, sr, kmsg, flags, 791 &mshot_finished); 792 else 793 ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, 794 kmsg->uaddr, flags); 795 796 if (ret < min_ret) { 797 if (ret == -EAGAIN && force_nonblock) { 798 ret = io_setup_async_msg(req, kmsg, issue_flags); 799 if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) { 800 io_kbuf_recycle(req, issue_flags); 801 return IOU_ISSUE_SKIP_COMPLETE; 802 } 803 return ret; 804 } 805 if (ret > 0 && io_net_retry(sock, flags)) { 806 sr->done_io += ret; 807 req->flags |= REQ_F_PARTIAL_IO; 808 return io_setup_async_msg(req, kmsg, issue_flags); 809 } 810 if (ret == -ERESTARTSYS) 811 ret = -EINTR; 812 req_set_fail(req); 813 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 814 req_set_fail(req); 815 } 816 817 if (ret > 0) 818 ret += sr->done_io; 819 else if (sr->done_io) 820 ret = sr->done_io; 821 else 822 io_kbuf_recycle(req, issue_flags); 823 824 cflags = io_put_kbuf(req, issue_flags); 825 if (kmsg->msg.msg_inq) 826 cflags |= IORING_CQE_F_SOCK_NONEMPTY; 827 828 if (!io_recv_finish(req, &ret, cflags, mshot_finished, issue_flags)) 829 goto retry_multishot; 830 831 if (mshot_finished) { 832 /* fast path, check for non-NULL to avoid function call */ 833 if (kmsg->free_iov) 834 kfree(kmsg->free_iov); 835 io_netmsg_recycle(req, issue_flags); 836 req->flags &= ~REQ_F_NEED_CLEANUP; 837 } 838 839 return ret; 840 } 841 842 int io_recv(struct io_kiocb *req, unsigned int issue_flags) 843 { 844 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 845 struct msghdr msg; 846 struct socket *sock; 847 unsigned int cflags; 848 unsigned flags; 849 int ret, min_ret = 0; 850 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 851 size_t len = sr->len; 852 853 if (!(req->flags & REQ_F_POLLED) && 854 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 855 return -EAGAIN; 856 857 if (!io_check_multishot(req, issue_flags)) 858 return -EAGAIN; 859 860 sock = sock_from_file(req->file); 861 if (unlikely(!sock)) 862 return -ENOTSOCK; 863 864 retry_multishot: 865 if (io_do_buffer_select(req)) { 866 void __user *buf; 867 868 buf = io_buffer_select(req, &len, issue_flags); 869 if (!buf) 870 return -ENOBUFS; 871 sr->buf = buf; 872 } 873 874 ret = import_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter); 875 if (unlikely(ret)) 876 goto out_free; 877 878 msg.msg_name = NULL; 879 msg.msg_namelen = 0; 880 msg.msg_control = NULL; 881 msg.msg_get_inq = 1; 882 msg.msg_flags = 0; 883 msg.msg_controllen = 0; 884 msg.msg_iocb = NULL; 885 msg.msg_ubuf = NULL; 886 887 flags = sr->msg_flags; 888 if (force_nonblock) 889 flags |= MSG_DONTWAIT; 890 if (flags & MSG_WAITALL) 891 min_ret = iov_iter_count(&msg.msg_iter); 892 893 ret = sock_recvmsg(sock, &msg, flags); 894 if (ret < min_ret) { 895 if (ret == -EAGAIN && force_nonblock) { 896 if (issue_flags & IO_URING_F_MULTISHOT) { 897 io_kbuf_recycle(req, issue_flags); 898 return IOU_ISSUE_SKIP_COMPLETE; 899 } 900 901 return -EAGAIN; 902 } 903 if (ret > 0 && io_net_retry(sock, flags)) { 904 sr->len -= ret; 905 sr->buf += ret; 906 sr->done_io += ret; 907 req->flags |= REQ_F_PARTIAL_IO; 908 return -EAGAIN; 909 } 910 if (ret == -ERESTARTSYS) 911 ret = -EINTR; 912 req_set_fail(req); 913 } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 914 out_free: 915 req_set_fail(req); 916 } 917 918 if (ret > 0) 919 ret += sr->done_io; 920 else if (sr->done_io) 921 ret = sr->done_io; 922 else 923 io_kbuf_recycle(req, issue_flags); 924 925 cflags = io_put_kbuf(req, issue_flags); 926 if (msg.msg_inq) 927 cflags |= IORING_CQE_F_SOCK_NONEMPTY; 928 929 if (!io_recv_finish(req, &ret, cflags, ret <= 0, issue_flags)) 930 goto retry_multishot; 931 932 return ret; 933 } 934 935 void io_send_zc_cleanup(struct io_kiocb *req) 936 { 937 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 938 struct io_async_msghdr *io; 939 940 if (req_has_async_data(req)) { 941 io = req->async_data; 942 /* might be ->fast_iov if *msg_copy_hdr failed */ 943 if (io->free_iov != io->fast_iov) 944 kfree(io->free_iov); 945 } 946 if (zc->notif) { 947 io_notif_flush(zc->notif); 948 zc->notif = NULL; 949 } 950 } 951 952 #define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF) 953 #define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE) 954 955 int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 956 { 957 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 958 struct io_ring_ctx *ctx = req->ctx; 959 struct io_kiocb *notif; 960 961 if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3))) 962 return -EINVAL; 963 /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */ 964 if (req->flags & REQ_F_CQE_SKIP) 965 return -EINVAL; 966 967 notif = zc->notif = io_alloc_notif(ctx); 968 if (!notif) 969 return -ENOMEM; 970 notif->cqe.user_data = req->cqe.user_data; 971 notif->cqe.res = 0; 972 notif->cqe.flags = IORING_CQE_F_NOTIF; 973 req->flags |= REQ_F_NEED_CLEANUP; 974 975 zc->flags = READ_ONCE(sqe->ioprio); 976 if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) { 977 if (zc->flags & ~IO_ZC_FLAGS_VALID) 978 return -EINVAL; 979 if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) { 980 io_notif_set_extended(notif); 981 io_notif_to_data(notif)->zc_report = true; 982 } 983 } 984 985 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 986 unsigned idx = READ_ONCE(sqe->buf_index); 987 988 if (unlikely(idx >= ctx->nr_user_bufs)) 989 return -EFAULT; 990 idx = array_index_nospec(idx, ctx->nr_user_bufs); 991 req->imu = READ_ONCE(ctx->user_bufs[idx]); 992 io_req_set_rsrc_node(notif, ctx, 0); 993 } 994 995 if (req->opcode == IORING_OP_SEND_ZC) { 996 if (READ_ONCE(sqe->__pad3[0])) 997 return -EINVAL; 998 zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 999 zc->addr_len = READ_ONCE(sqe->addr_len); 1000 } else { 1001 if (unlikely(sqe->addr2 || sqe->file_index)) 1002 return -EINVAL; 1003 if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF)) 1004 return -EINVAL; 1005 } 1006 1007 zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1008 zc->len = READ_ONCE(sqe->len); 1009 zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 1010 if (zc->msg_flags & MSG_DONTWAIT) 1011 req->flags |= REQ_F_NOWAIT; 1012 1013 zc->done_io = 0; 1014 1015 #ifdef CONFIG_COMPAT 1016 if (req->ctx->compat) 1017 zc->msg_flags |= MSG_CMSG_COMPAT; 1018 #endif 1019 return 0; 1020 } 1021 1022 static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb, 1023 struct iov_iter *from, size_t length) 1024 { 1025 skb_zcopy_downgrade_managed(skb); 1026 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 1027 } 1028 1029 static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, 1030 struct iov_iter *from, size_t length) 1031 { 1032 struct skb_shared_info *shinfo = skb_shinfo(skb); 1033 int frag = shinfo->nr_frags; 1034 int ret = 0; 1035 struct bvec_iter bi; 1036 ssize_t copied = 0; 1037 unsigned long truesize = 0; 1038 1039 if (!frag) 1040 shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; 1041 else if (unlikely(!skb_zcopy_managed(skb))) 1042 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 1043 1044 bi.bi_size = min(from->count, length); 1045 bi.bi_bvec_done = from->iov_offset; 1046 bi.bi_idx = 0; 1047 1048 while (bi.bi_size && frag < MAX_SKB_FRAGS) { 1049 struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); 1050 1051 copied += v.bv_len; 1052 truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); 1053 __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, 1054 v.bv_offset, v.bv_len); 1055 bvec_iter_advance_single(from->bvec, &bi, v.bv_len); 1056 } 1057 if (bi.bi_size) 1058 ret = -EMSGSIZE; 1059 1060 shinfo->nr_frags = frag; 1061 from->bvec += bi.bi_idx; 1062 from->nr_segs -= bi.bi_idx; 1063 from->count -= copied; 1064 from->iov_offset = bi.bi_bvec_done; 1065 1066 skb->data_len += copied; 1067 skb->len += copied; 1068 skb->truesize += truesize; 1069 1070 if (sk && sk->sk_type == SOCK_STREAM) { 1071 sk_wmem_queued_add(sk, truesize); 1072 if (!skb_zcopy_pure(skb)) 1073 sk_mem_charge(sk, truesize); 1074 } else { 1075 refcount_add(truesize, &skb->sk->sk_wmem_alloc); 1076 } 1077 return ret; 1078 } 1079 1080 int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) 1081 { 1082 struct sockaddr_storage __address; 1083 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 1084 struct msghdr msg; 1085 struct socket *sock; 1086 unsigned msg_flags; 1087 int ret, min_ret = 0; 1088 1089 sock = sock_from_file(req->file); 1090 if (unlikely(!sock)) 1091 return -ENOTSOCK; 1092 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 1093 return -EOPNOTSUPP; 1094 1095 msg.msg_name = NULL; 1096 msg.msg_control = NULL; 1097 msg.msg_controllen = 0; 1098 msg.msg_namelen = 0; 1099 1100 if (zc->addr) { 1101 if (req_has_async_data(req)) { 1102 struct io_async_msghdr *io = req->async_data; 1103 1104 msg.msg_name = &io->addr; 1105 } else { 1106 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); 1107 if (unlikely(ret < 0)) 1108 return ret; 1109 msg.msg_name = (struct sockaddr *)&__address; 1110 } 1111 msg.msg_namelen = zc->addr_len; 1112 } 1113 1114 if (!(req->flags & REQ_F_POLLED) && 1115 (zc->flags & IORING_RECVSEND_POLL_FIRST)) 1116 return io_setup_async_addr(req, &__address, issue_flags); 1117 1118 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 1119 ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu, 1120 (u64)(uintptr_t)zc->buf, zc->len); 1121 if (unlikely(ret)) 1122 return ret; 1123 msg.sg_from_iter = io_sg_from_iter; 1124 } else { 1125 io_notif_set_extended(zc->notif); 1126 ret = import_ubuf(ITER_SOURCE, zc->buf, zc->len, &msg.msg_iter); 1127 if (unlikely(ret)) 1128 return ret; 1129 ret = io_notif_account_mem(zc->notif, zc->len); 1130 if (unlikely(ret)) 1131 return ret; 1132 msg.sg_from_iter = io_sg_from_iter_iovec; 1133 } 1134 1135 msg_flags = zc->msg_flags | MSG_ZEROCOPY; 1136 if (issue_flags & IO_URING_F_NONBLOCK) 1137 msg_flags |= MSG_DONTWAIT; 1138 if (msg_flags & MSG_WAITALL) 1139 min_ret = iov_iter_count(&msg.msg_iter); 1140 msg_flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; 1141 1142 msg.msg_flags = msg_flags; 1143 msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; 1144 ret = sock_sendmsg(sock, &msg); 1145 1146 if (unlikely(ret < min_ret)) { 1147 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1148 return io_setup_async_addr(req, &__address, issue_flags); 1149 1150 if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { 1151 zc->len -= ret; 1152 zc->buf += ret; 1153 zc->done_io += ret; 1154 req->flags |= REQ_F_PARTIAL_IO; 1155 return io_setup_async_addr(req, &__address, issue_flags); 1156 } 1157 if (ret == -ERESTARTSYS) 1158 ret = -EINTR; 1159 req_set_fail(req); 1160 } 1161 1162 if (ret >= 0) 1163 ret += zc->done_io; 1164 else if (zc->done_io) 1165 ret = zc->done_io; 1166 1167 /* 1168 * If we're in io-wq we can't rely on tw ordering guarantees, defer 1169 * flushing notif to io_send_zc_cleanup() 1170 */ 1171 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 1172 io_notif_flush(zc->notif); 1173 req->flags &= ~REQ_F_NEED_CLEANUP; 1174 } 1175 io_req_set_res(req, ret, IORING_CQE_F_MORE); 1176 return IOU_OK; 1177 } 1178 1179 int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags) 1180 { 1181 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 1182 struct io_async_msghdr iomsg, *kmsg; 1183 struct socket *sock; 1184 unsigned flags; 1185 int ret, min_ret = 0; 1186 1187 io_notif_set_extended(sr->notif); 1188 1189 sock = sock_from_file(req->file); 1190 if (unlikely(!sock)) 1191 return -ENOTSOCK; 1192 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 1193 return -EOPNOTSUPP; 1194 1195 if (req_has_async_data(req)) { 1196 kmsg = req->async_data; 1197 } else { 1198 ret = io_sendmsg_copy_hdr(req, &iomsg); 1199 if (ret) 1200 return ret; 1201 kmsg = &iomsg; 1202 } 1203 1204 if (!(req->flags & REQ_F_POLLED) && 1205 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 1206 return io_setup_async_msg(req, kmsg, issue_flags); 1207 1208 flags = sr->msg_flags | MSG_ZEROCOPY; 1209 if (issue_flags & IO_URING_F_NONBLOCK) 1210 flags |= MSG_DONTWAIT; 1211 if (flags & MSG_WAITALL) 1212 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 1213 1214 kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg; 1215 kmsg->msg.sg_from_iter = io_sg_from_iter_iovec; 1216 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 1217 1218 if (unlikely(ret < min_ret)) { 1219 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1220 return io_setup_async_msg(req, kmsg, issue_flags); 1221 1222 if (ret > 0 && io_net_retry(sock, flags)) { 1223 sr->done_io += ret; 1224 req->flags |= REQ_F_PARTIAL_IO; 1225 return io_setup_async_msg(req, kmsg, issue_flags); 1226 } 1227 if (ret == -ERESTARTSYS) 1228 ret = -EINTR; 1229 req_set_fail(req); 1230 } 1231 /* fast path, check for non-NULL to avoid function call */ 1232 if (kmsg->free_iov) { 1233 kfree(kmsg->free_iov); 1234 kmsg->free_iov = NULL; 1235 } 1236 1237 io_netmsg_recycle(req, issue_flags); 1238 if (ret >= 0) 1239 ret += sr->done_io; 1240 else if (sr->done_io) 1241 ret = sr->done_io; 1242 1243 /* 1244 * If we're in io-wq we can't rely on tw ordering guarantees, defer 1245 * flushing notif to io_send_zc_cleanup() 1246 */ 1247 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 1248 io_notif_flush(sr->notif); 1249 req->flags &= ~REQ_F_NEED_CLEANUP; 1250 } 1251 io_req_set_res(req, ret, IORING_CQE_F_MORE); 1252 return IOU_OK; 1253 } 1254 1255 void io_sendrecv_fail(struct io_kiocb *req) 1256 { 1257 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 1258 1259 if (req->flags & REQ_F_PARTIAL_IO) 1260 req->cqe.res = sr->done_io; 1261 1262 if ((req->flags & REQ_F_NEED_CLEANUP) && 1263 (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) 1264 req->cqe.flags |= IORING_CQE_F_MORE; 1265 } 1266 1267 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1268 { 1269 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1270 unsigned flags; 1271 1272 if (sqe->len || sqe->buf_index) 1273 return -EINVAL; 1274 1275 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1276 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 1277 accept->flags = READ_ONCE(sqe->accept_flags); 1278 accept->nofile = rlimit(RLIMIT_NOFILE); 1279 flags = READ_ONCE(sqe->ioprio); 1280 if (flags & ~IORING_ACCEPT_MULTISHOT) 1281 return -EINVAL; 1282 1283 accept->file_slot = READ_ONCE(sqe->file_index); 1284 if (accept->file_slot) { 1285 if (accept->flags & SOCK_CLOEXEC) 1286 return -EINVAL; 1287 if (flags & IORING_ACCEPT_MULTISHOT && 1288 accept->file_slot != IORING_FILE_INDEX_ALLOC) 1289 return -EINVAL; 1290 } 1291 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1292 return -EINVAL; 1293 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) 1294 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1295 if (flags & IORING_ACCEPT_MULTISHOT) 1296 req->flags |= REQ_F_APOLL_MULTISHOT; 1297 return 0; 1298 } 1299 1300 int io_accept(struct io_kiocb *req, unsigned int issue_flags) 1301 { 1302 struct io_ring_ctx *ctx = req->ctx; 1303 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1304 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1305 unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; 1306 bool fixed = !!accept->file_slot; 1307 struct file *file; 1308 int ret, fd; 1309 1310 if (!io_check_multishot(req, issue_flags)) 1311 return -EAGAIN; 1312 retry: 1313 if (!fixed) { 1314 fd = __get_unused_fd_flags(accept->flags, accept->nofile); 1315 if (unlikely(fd < 0)) 1316 return fd; 1317 } 1318 file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, 1319 accept->flags); 1320 if (IS_ERR(file)) { 1321 if (!fixed) 1322 put_unused_fd(fd); 1323 ret = PTR_ERR(file); 1324 if (ret == -EAGAIN && force_nonblock) { 1325 /* 1326 * if it's multishot and polled, we don't need to 1327 * return EAGAIN to arm the poll infra since it 1328 * has already been done 1329 */ 1330 if (issue_flags & IO_URING_F_MULTISHOT) 1331 ret = IOU_ISSUE_SKIP_COMPLETE; 1332 return ret; 1333 } 1334 if (ret == -ERESTARTSYS) 1335 ret = -EINTR; 1336 req_set_fail(req); 1337 } else if (!fixed) { 1338 fd_install(fd, file); 1339 ret = fd; 1340 } else { 1341 ret = io_fixed_fd_install(req, issue_flags, file, 1342 accept->file_slot); 1343 } 1344 1345 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 1346 io_req_set_res(req, ret, 0); 1347 return IOU_OK; 1348 } 1349 1350 if (ret < 0) 1351 return ret; 1352 if (io_aux_cqe(ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, 1353 req->cqe.user_data, ret, IORING_CQE_F_MORE, true)) 1354 goto retry; 1355 1356 return -ECANCELED; 1357 } 1358 1359 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1360 { 1361 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1362 1363 if (sqe->addr || sqe->rw_flags || sqe->buf_index) 1364 return -EINVAL; 1365 1366 sock->domain = READ_ONCE(sqe->fd); 1367 sock->type = READ_ONCE(sqe->off); 1368 sock->protocol = READ_ONCE(sqe->len); 1369 sock->file_slot = READ_ONCE(sqe->file_index); 1370 sock->nofile = rlimit(RLIMIT_NOFILE); 1371 1372 sock->flags = sock->type & ~SOCK_TYPE_MASK; 1373 if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) 1374 return -EINVAL; 1375 if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1376 return -EINVAL; 1377 return 0; 1378 } 1379 1380 int io_socket(struct io_kiocb *req, unsigned int issue_flags) 1381 { 1382 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1383 bool fixed = !!sock->file_slot; 1384 struct file *file; 1385 int ret, fd; 1386 1387 if (!fixed) { 1388 fd = __get_unused_fd_flags(sock->flags, sock->nofile); 1389 if (unlikely(fd < 0)) 1390 return fd; 1391 } 1392 file = __sys_socket_file(sock->domain, sock->type, sock->protocol); 1393 if (IS_ERR(file)) { 1394 if (!fixed) 1395 put_unused_fd(fd); 1396 ret = PTR_ERR(file); 1397 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1398 return -EAGAIN; 1399 if (ret == -ERESTARTSYS) 1400 ret = -EINTR; 1401 req_set_fail(req); 1402 } else if (!fixed) { 1403 fd_install(fd, file); 1404 ret = fd; 1405 } else { 1406 ret = io_fixed_fd_install(req, issue_flags, file, 1407 sock->file_slot); 1408 } 1409 io_req_set_res(req, ret, 0); 1410 return IOU_OK; 1411 } 1412 1413 int io_connect_prep_async(struct io_kiocb *req) 1414 { 1415 struct io_async_connect *io = req->async_data; 1416 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1417 1418 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); 1419 } 1420 1421 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1422 { 1423 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1424 1425 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) 1426 return -EINVAL; 1427 1428 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1429 conn->addr_len = READ_ONCE(sqe->addr2); 1430 conn->in_progress = conn->seen_econnaborted = false; 1431 return 0; 1432 } 1433 1434 int io_connect(struct io_kiocb *req, unsigned int issue_flags) 1435 { 1436 struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); 1437 struct io_async_connect __io, *io; 1438 unsigned file_flags; 1439 int ret; 1440 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1441 1442 if (connect->in_progress) { 1443 struct socket *socket; 1444 1445 ret = -ENOTSOCK; 1446 socket = sock_from_file(req->file); 1447 if (socket) 1448 ret = sock_error(socket->sk); 1449 goto out; 1450 } 1451 1452 if (req_has_async_data(req)) { 1453 io = req->async_data; 1454 } else { 1455 ret = move_addr_to_kernel(connect->addr, 1456 connect->addr_len, 1457 &__io.address); 1458 if (ret) 1459 goto out; 1460 io = &__io; 1461 } 1462 1463 file_flags = force_nonblock ? O_NONBLOCK : 0; 1464 1465 ret = __sys_connect_file(req->file, &io->address, 1466 connect->addr_len, file_flags); 1467 if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED) 1468 && force_nonblock) { 1469 if (ret == -EINPROGRESS) { 1470 connect->in_progress = true; 1471 return -EAGAIN; 1472 } 1473 if (ret == -ECONNABORTED) { 1474 if (connect->seen_econnaborted) 1475 goto out; 1476 connect->seen_econnaborted = true; 1477 } 1478 if (req_has_async_data(req)) 1479 return -EAGAIN; 1480 if (io_alloc_async_data(req)) { 1481 ret = -ENOMEM; 1482 goto out; 1483 } 1484 memcpy(req->async_data, &__io, sizeof(__io)); 1485 return -EAGAIN; 1486 } 1487 if (ret == -ERESTARTSYS) 1488 ret = -EINTR; 1489 out: 1490 if (ret < 0) 1491 req_set_fail(req); 1492 io_req_set_res(req, ret, 0); 1493 return IOU_OK; 1494 } 1495 1496 void io_netmsg_cache_free(struct io_cache_entry *entry) 1497 { 1498 kfree(container_of(entry, struct io_async_msghdr, cache)); 1499 } 1500 #endif 1501