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