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 unsigned nr_multishot_loops; 64 u16 flags; 65 /* initialised and used only by !msg send variants */ 66 u16 addr_len; 67 u16 buf_group; 68 void __user *addr; 69 void __user *msg_control; 70 /* used only for send zerocopy */ 71 struct io_kiocb *notif; 72 }; 73 74 /* 75 * Number of times we'll try and do receives if there's more data. If we 76 * exceed this limit, then add us to the back of the queue and retry from 77 * there. This helps fairness between flooding clients. 78 */ 79 #define MULTISHOT_MAX_RETRY 32 80 81 static inline bool io_check_multishot(struct io_kiocb *req, 82 unsigned int issue_flags) 83 { 84 /* 85 * When ->locked_cq is set we only allow to post CQEs from the original 86 * task context. Usual request completions will be handled in other 87 * generic paths but multipoll may decide to post extra cqes. 88 */ 89 return !(issue_flags & IO_URING_F_IOWQ) || 90 !(req->flags & REQ_F_APOLL_MULTISHOT) || 91 !req->ctx->task_complete; 92 } 93 94 int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 95 { 96 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 97 98 if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || 99 sqe->buf_index || sqe->splice_fd_in)) 100 return -EINVAL; 101 102 shutdown->how = READ_ONCE(sqe->len); 103 req->flags |= REQ_F_FORCE_ASYNC; 104 return 0; 105 } 106 107 int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) 108 { 109 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 110 struct socket *sock; 111 int ret; 112 113 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 114 115 sock = sock_from_file(req->file); 116 if (unlikely(!sock)) 117 return -ENOTSOCK; 118 119 ret = __sys_shutdown_sock(sock, shutdown->how); 120 io_req_set_res(req, ret, 0); 121 return IOU_OK; 122 } 123 124 static bool io_net_retry(struct socket *sock, int flags) 125 { 126 if (!(flags & MSG_WAITALL)) 127 return false; 128 return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; 129 } 130 131 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) 132 { 133 struct io_async_msghdr *hdr = req->async_data; 134 135 if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) 136 return; 137 138 /* Let normal cleanup path reap it if we fail adding to the cache */ 139 if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { 140 req->async_data = NULL; 141 req->flags &= ~REQ_F_ASYNC_DATA; 142 } 143 } 144 145 static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req, 146 unsigned int issue_flags) 147 { 148 struct io_ring_ctx *ctx = req->ctx; 149 struct io_cache_entry *entry; 150 struct io_async_msghdr *hdr; 151 152 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 153 entry = io_alloc_cache_get(&ctx->netmsg_cache); 154 if (entry) { 155 hdr = container_of(entry, struct io_async_msghdr, cache); 156 hdr->free_iov = NULL; 157 req->flags |= REQ_F_ASYNC_DATA; 158 req->async_data = hdr; 159 return hdr; 160 } 161 } 162 163 if (!io_alloc_async_data(req)) { 164 hdr = req->async_data; 165 hdr->free_iov = NULL; 166 return hdr; 167 } 168 return NULL; 169 } 170 171 static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req) 172 { 173 /* ->prep_async is always called from the submission context */ 174 return io_msg_alloc_async(req, 0); 175 } 176 177 static int io_setup_async_msg(struct io_kiocb *req, 178 struct io_async_msghdr *kmsg, 179 unsigned int issue_flags) 180 { 181 struct io_async_msghdr *async_msg; 182 183 if (req_has_async_data(req)) 184 return -EAGAIN; 185 async_msg = io_msg_alloc_async(req, issue_flags); 186 if (!async_msg) { 187 kfree(kmsg->free_iov); 188 return -ENOMEM; 189 } 190 req->flags |= REQ_F_NEED_CLEANUP; 191 memcpy(async_msg, kmsg, sizeof(*kmsg)); 192 if (async_msg->msg.msg_name) 193 async_msg->msg.msg_name = &async_msg->addr; 194 195 if ((req->flags & REQ_F_BUFFER_SELECT) && !async_msg->msg.msg_iter.nr_segs) 196 return -EAGAIN; 197 198 /* if were using fast_iov, set it to the new one */ 199 if (iter_is_iovec(&kmsg->msg.msg_iter) && !kmsg->free_iov) { 200 size_t fast_idx = iter_iov(&kmsg->msg.msg_iter) - kmsg->fast_iov; 201 async_msg->msg.msg_iter.__iov = &async_msg->fast_iov[fast_idx]; 202 } 203 204 return -EAGAIN; 205 } 206 207 #ifdef CONFIG_COMPAT 208 static int io_compat_msg_copy_hdr(struct io_kiocb *req, 209 struct io_async_msghdr *iomsg, 210 struct compat_msghdr *msg, int ddir) 211 { 212 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 213 struct compat_iovec __user *uiov; 214 int ret; 215 216 if (copy_from_user(msg, sr->umsg_compat, sizeof(*msg))) 217 return -EFAULT; 218 219 uiov = compat_ptr(msg->msg_iov); 220 if (req->flags & REQ_F_BUFFER_SELECT) { 221 compat_ssize_t clen; 222 223 iomsg->free_iov = NULL; 224 if (msg->msg_iovlen == 0) { 225 sr->len = 0; 226 } else if (msg->msg_iovlen > 1) { 227 return -EINVAL; 228 } else { 229 if (!access_ok(uiov, sizeof(*uiov))) 230 return -EFAULT; 231 if (__get_user(clen, &uiov->iov_len)) 232 return -EFAULT; 233 if (clen < 0) 234 return -EINVAL; 235 sr->len = clen; 236 } 237 238 return 0; 239 } 240 241 iomsg->free_iov = iomsg->fast_iov; 242 ret = __import_iovec(ddir, (struct iovec __user *)uiov, msg->msg_iovlen, 243 UIO_FASTIOV, &iomsg->free_iov, 244 &iomsg->msg.msg_iter, true); 245 if (unlikely(ret < 0)) 246 return ret; 247 248 return 0; 249 } 250 #endif 251 252 static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg, 253 struct user_msghdr *msg, int ddir) 254 { 255 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 256 int ret; 257 258 if (copy_from_user(msg, sr->umsg, sizeof(*sr->umsg))) 259 return -EFAULT; 260 261 if (req->flags & REQ_F_BUFFER_SELECT) { 262 if (msg->msg_iovlen == 0) { 263 sr->len = iomsg->fast_iov[0].iov_len = 0; 264 iomsg->fast_iov[0].iov_base = NULL; 265 iomsg->free_iov = NULL; 266 } else if (msg->msg_iovlen > 1) { 267 return -EINVAL; 268 } else { 269 if (copy_from_user(iomsg->fast_iov, msg->msg_iov, 270 sizeof(*msg->msg_iov))) 271 return -EFAULT; 272 sr->len = iomsg->fast_iov[0].iov_len; 273 iomsg->free_iov = NULL; 274 } 275 276 return 0; 277 } 278 279 iomsg->free_iov = iomsg->fast_iov; 280 ret = __import_iovec(ddir, msg->msg_iov, msg->msg_iovlen, UIO_FASTIOV, 281 &iomsg->free_iov, &iomsg->msg.msg_iter, false); 282 if (unlikely(ret < 0)) 283 return ret; 284 285 return 0; 286 } 287 288 static int io_sendmsg_copy_hdr(struct io_kiocb *req, 289 struct io_async_msghdr *iomsg) 290 { 291 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 292 struct user_msghdr msg; 293 int ret; 294 295 iomsg->msg.msg_name = &iomsg->addr; 296 iomsg->msg.msg_iter.nr_segs = 0; 297 298 #ifdef CONFIG_COMPAT 299 if (unlikely(req->ctx->compat)) { 300 struct compat_msghdr cmsg; 301 302 ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_SOURCE); 303 if (unlikely(ret)) 304 return ret; 305 306 return __get_compat_msghdr(&iomsg->msg, &cmsg, NULL); 307 } 308 #endif 309 310 ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_SOURCE); 311 if (unlikely(ret)) 312 return ret; 313 314 ret = __copy_msghdr(&iomsg->msg, &msg, NULL); 315 316 /* save msg_control as sys_sendmsg() overwrites it */ 317 sr->msg_control = iomsg->msg.msg_control_user; 318 return ret; 319 } 320 321 int io_send_prep_async(struct io_kiocb *req) 322 { 323 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 324 struct io_async_msghdr *io; 325 int ret; 326 327 if (!zc->addr || req_has_async_data(req)) 328 return 0; 329 io = io_msg_alloc_async_prep(req); 330 if (!io) 331 return -ENOMEM; 332 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); 333 return ret; 334 } 335 336 static int io_setup_async_addr(struct io_kiocb *req, 337 struct sockaddr_storage *addr_storage, 338 unsigned int issue_flags) 339 { 340 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 341 struct io_async_msghdr *io; 342 343 if (!sr->addr || req_has_async_data(req)) 344 return -EAGAIN; 345 io = io_msg_alloc_async(req, issue_flags); 346 if (!io) 347 return -ENOMEM; 348 memcpy(&io->addr, addr_storage, sizeof(io->addr)); 349 return -EAGAIN; 350 } 351 352 int io_sendmsg_prep_async(struct io_kiocb *req) 353 { 354 int ret; 355 356 if (!io_msg_alloc_async_prep(req)) 357 return -ENOMEM; 358 ret = io_sendmsg_copy_hdr(req, req->async_data); 359 if (!ret) 360 req->flags |= REQ_F_NEED_CLEANUP; 361 return ret; 362 } 363 364 void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) 365 { 366 struct io_async_msghdr *io = req->async_data; 367 368 kfree(io->free_iov); 369 } 370 371 int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 372 { 373 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 374 375 if (req->opcode == IORING_OP_SEND) { 376 if (READ_ONCE(sqe->__pad3[0])) 377 return -EINVAL; 378 sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 379 sr->addr_len = READ_ONCE(sqe->addr_len); 380 } else if (sqe->addr2 || sqe->file_index) { 381 return -EINVAL; 382 } 383 384 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 385 sr->len = READ_ONCE(sqe->len); 386 sr->flags = READ_ONCE(sqe->ioprio); 387 if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) 388 return -EINVAL; 389 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 390 if (sr->msg_flags & MSG_DONTWAIT) 391 req->flags |= REQ_F_NOWAIT; 392 393 #ifdef CONFIG_COMPAT 394 if (req->ctx->compat) 395 sr->msg_flags |= MSG_CMSG_COMPAT; 396 #endif 397 sr->done_io = 0; 398 return 0; 399 } 400 401 int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) 402 { 403 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 404 struct io_async_msghdr iomsg, *kmsg; 405 struct socket *sock; 406 unsigned flags; 407 int min_ret = 0; 408 int ret; 409 410 sock = sock_from_file(req->file); 411 if (unlikely(!sock)) 412 return -ENOTSOCK; 413 414 if (req_has_async_data(req)) { 415 kmsg = req->async_data; 416 kmsg->msg.msg_control_user = sr->msg_control; 417 } else { 418 ret = io_sendmsg_copy_hdr(req, &iomsg); 419 if (ret) 420 return ret; 421 kmsg = &iomsg; 422 } 423 424 if (!(req->flags & REQ_F_POLLED) && 425 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 426 return io_setup_async_msg(req, kmsg, issue_flags); 427 428 flags = sr->msg_flags; 429 if (issue_flags & IO_URING_F_NONBLOCK) 430 flags |= MSG_DONTWAIT; 431 if (flags & MSG_WAITALL) 432 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 433 434 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 435 436 if (ret < min_ret) { 437 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 438 return io_setup_async_msg(req, kmsg, issue_flags); 439 if (ret > 0 && io_net_retry(sock, flags)) { 440 kmsg->msg.msg_controllen = 0; 441 kmsg->msg.msg_control = NULL; 442 sr->done_io += ret; 443 req->flags |= REQ_F_PARTIAL_IO; 444 return io_setup_async_msg(req, kmsg, issue_flags); 445 } 446 if (ret == -ERESTARTSYS) 447 ret = -EINTR; 448 req_set_fail(req); 449 } 450 /* fast path, check for non-NULL to avoid function call */ 451 if (kmsg->free_iov) 452 kfree(kmsg->free_iov); 453 req->flags &= ~REQ_F_NEED_CLEANUP; 454 io_netmsg_recycle(req, issue_flags); 455 if (ret >= 0) 456 ret += sr->done_io; 457 else if (sr->done_io) 458 ret = sr->done_io; 459 io_req_set_res(req, ret, 0); 460 return IOU_OK; 461 } 462 463 int io_send(struct io_kiocb *req, unsigned int issue_flags) 464 { 465 struct sockaddr_storage __address; 466 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 467 struct msghdr msg; 468 struct socket *sock; 469 unsigned flags; 470 int min_ret = 0; 471 int ret; 472 473 msg.msg_name = NULL; 474 msg.msg_control = NULL; 475 msg.msg_controllen = 0; 476 msg.msg_namelen = 0; 477 msg.msg_ubuf = NULL; 478 479 if (sr->addr) { 480 if (req_has_async_data(req)) { 481 struct io_async_msghdr *io = req->async_data; 482 483 msg.msg_name = &io->addr; 484 } else { 485 ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address); 486 if (unlikely(ret < 0)) 487 return ret; 488 msg.msg_name = (struct sockaddr *)&__address; 489 } 490 msg.msg_namelen = sr->addr_len; 491 } 492 493 if (!(req->flags & REQ_F_POLLED) && 494 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 495 return io_setup_async_addr(req, &__address, issue_flags); 496 497 sock = sock_from_file(req->file); 498 if (unlikely(!sock)) 499 return -ENOTSOCK; 500 501 ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter); 502 if (unlikely(ret)) 503 return ret; 504 505 flags = sr->msg_flags; 506 if (issue_flags & IO_URING_F_NONBLOCK) 507 flags |= MSG_DONTWAIT; 508 if (flags & MSG_WAITALL) 509 min_ret = iov_iter_count(&msg.msg_iter); 510 511 flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; 512 msg.msg_flags = flags; 513 ret = sock_sendmsg(sock, &msg); 514 if (ret < min_ret) { 515 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 516 return io_setup_async_addr(req, &__address, issue_flags); 517 518 if (ret > 0 && io_net_retry(sock, flags)) { 519 sr->len -= ret; 520 sr->buf += ret; 521 sr->done_io += ret; 522 req->flags |= REQ_F_PARTIAL_IO; 523 return io_setup_async_addr(req, &__address, issue_flags); 524 } 525 if (ret == -ERESTARTSYS) 526 ret = -EINTR; 527 req_set_fail(req); 528 } 529 if (ret >= 0) 530 ret += sr->done_io; 531 else if (sr->done_io) 532 ret = sr->done_io; 533 io_req_set_res(req, ret, 0); 534 return IOU_OK; 535 } 536 537 static int io_recvmsg_mshot_prep(struct io_kiocb *req, 538 struct io_async_msghdr *iomsg, 539 int namelen, size_t controllen) 540 { 541 if ((req->flags & (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) == 542 (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) { 543 int hdr; 544 545 if (unlikely(namelen < 0)) 546 return -EOVERFLOW; 547 if (check_add_overflow(sizeof(struct io_uring_recvmsg_out), 548 namelen, &hdr)) 549 return -EOVERFLOW; 550 if (check_add_overflow(hdr, controllen, &hdr)) 551 return -EOVERFLOW; 552 553 iomsg->namelen = namelen; 554 iomsg->controllen = controllen; 555 return 0; 556 } 557 558 return 0; 559 } 560 561 static int io_recvmsg_copy_hdr(struct io_kiocb *req, 562 struct io_async_msghdr *iomsg) 563 { 564 struct user_msghdr msg; 565 int ret; 566 567 iomsg->msg.msg_name = &iomsg->addr; 568 iomsg->msg.msg_iter.nr_segs = 0; 569 570 #ifdef CONFIG_COMPAT 571 if (unlikely(req->ctx->compat)) { 572 struct compat_msghdr cmsg; 573 574 ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_DEST); 575 if (unlikely(ret)) 576 return ret; 577 578 ret = __get_compat_msghdr(&iomsg->msg, &cmsg, &iomsg->uaddr); 579 if (unlikely(ret)) 580 return ret; 581 582 return io_recvmsg_mshot_prep(req, iomsg, cmsg.msg_namelen, 583 cmsg.msg_controllen); 584 } 585 #endif 586 587 ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_DEST); 588 if (unlikely(ret)) 589 return ret; 590 591 ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 592 if (unlikely(ret)) 593 return ret; 594 595 return io_recvmsg_mshot_prep(req, iomsg, msg.msg_namelen, 596 msg.msg_controllen); 597 } 598 599 int io_recvmsg_prep_async(struct io_kiocb *req) 600 { 601 struct io_async_msghdr *iomsg; 602 int ret; 603 604 if (!io_msg_alloc_async_prep(req)) 605 return -ENOMEM; 606 iomsg = req->async_data; 607 ret = io_recvmsg_copy_hdr(req, iomsg); 608 if (!ret) 609 req->flags |= REQ_F_NEED_CLEANUP; 610 return ret; 611 } 612 613 #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) 614 615 int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 616 { 617 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 618 619 if (unlikely(sqe->file_index || sqe->addr2)) 620 return -EINVAL; 621 622 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 623 sr->len = READ_ONCE(sqe->len); 624 sr->flags = READ_ONCE(sqe->ioprio); 625 if (sr->flags & ~(RECVMSG_FLAGS)) 626 return -EINVAL; 627 sr->msg_flags = READ_ONCE(sqe->msg_flags); 628 if (sr->msg_flags & MSG_DONTWAIT) 629 req->flags |= REQ_F_NOWAIT; 630 if (sr->msg_flags & MSG_ERRQUEUE) 631 req->flags |= REQ_F_CLEAR_POLLIN; 632 if (sr->flags & IORING_RECV_MULTISHOT) { 633 if (!(req->flags & REQ_F_BUFFER_SELECT)) 634 return -EINVAL; 635 if (sr->msg_flags & MSG_WAITALL) 636 return -EINVAL; 637 if (req->opcode == IORING_OP_RECV && sr->len) 638 return -EINVAL; 639 req->flags |= REQ_F_APOLL_MULTISHOT; 640 /* 641 * Store the buffer group for this multishot receive separately, 642 * as if we end up doing an io-wq based issue that selects a 643 * buffer, it has to be committed immediately and that will 644 * clear ->buf_list. This means we lose the link to the buffer 645 * list, and the eventual buffer put on completion then cannot 646 * restore it. 647 */ 648 sr->buf_group = req->buf_index; 649 } 650 651 #ifdef CONFIG_COMPAT 652 if (req->ctx->compat) 653 sr->msg_flags |= MSG_CMSG_COMPAT; 654 #endif 655 sr->done_io = 0; 656 sr->nr_multishot_loops = 0; 657 return 0; 658 } 659 660 static inline void io_recv_prep_retry(struct io_kiocb *req) 661 { 662 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 663 664 sr->done_io = 0; 665 sr->len = 0; /* get from the provided buffer */ 666 req->buf_index = sr->buf_group; 667 } 668 669 /* 670 * Finishes io_recv and io_recvmsg. 671 * 672 * Returns true if it is actually finished, or false if it should run 673 * again (for multishot). 674 */ 675 static inline bool io_recv_finish(struct io_kiocb *req, int *ret, 676 struct msghdr *msg, bool mshot_finished, 677 unsigned issue_flags) 678 { 679 unsigned int cflags; 680 681 cflags = io_put_kbuf(req, issue_flags); 682 if (msg->msg_inq && msg->msg_inq != -1) 683 cflags |= IORING_CQE_F_SOCK_NONEMPTY; 684 685 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 686 io_req_set_res(req, *ret, cflags); 687 *ret = IOU_OK; 688 return true; 689 } 690 691 if (mshot_finished) 692 goto finish; 693 694 /* 695 * Fill CQE for this receive and see if we should keep trying to 696 * receive from this socket. 697 */ 698 if (io_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER, 699 *ret, cflags | IORING_CQE_F_MORE)) { 700 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 701 int mshot_retry_ret = IOU_ISSUE_SKIP_COMPLETE; 702 703 io_recv_prep_retry(req); 704 /* Known not-empty or unknown state, retry */ 705 if (cflags & IORING_CQE_F_SOCK_NONEMPTY || msg->msg_inq == -1) { 706 if (sr->nr_multishot_loops++ < MULTISHOT_MAX_RETRY) 707 return false; 708 /* mshot retries exceeded, force a requeue */ 709 sr->nr_multishot_loops = 0; 710 mshot_retry_ret = IOU_REQUEUE; 711 } 712 if (issue_flags & IO_URING_F_MULTISHOT) 713 *ret = mshot_retry_ret; 714 else 715 *ret = -EAGAIN; 716 return true; 717 } 718 /* Otherwise stop multishot but use the current result. */ 719 finish: 720 io_req_set_res(req, *ret, cflags); 721 722 if (issue_flags & IO_URING_F_MULTISHOT) 723 *ret = IOU_STOP_MULTISHOT; 724 else 725 *ret = IOU_OK; 726 return true; 727 } 728 729 static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg, 730 struct io_sr_msg *sr, void __user **buf, 731 size_t *len) 732 { 733 unsigned long ubuf = (unsigned long) *buf; 734 unsigned long hdr; 735 736 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 737 kmsg->controllen; 738 if (*len < hdr) 739 return -EFAULT; 740 741 if (kmsg->controllen) { 742 unsigned long control = ubuf + hdr - kmsg->controllen; 743 744 kmsg->msg.msg_control_user = (void __user *) control; 745 kmsg->msg.msg_controllen = kmsg->controllen; 746 } 747 748 sr->buf = *buf; /* stash for later copy */ 749 *buf = (void __user *) (ubuf + hdr); 750 kmsg->payloadlen = *len = *len - hdr; 751 return 0; 752 } 753 754 struct io_recvmsg_multishot_hdr { 755 struct io_uring_recvmsg_out msg; 756 struct sockaddr_storage addr; 757 }; 758 759 static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io, 760 struct io_async_msghdr *kmsg, 761 unsigned int flags, bool *finished) 762 { 763 int err; 764 int copy_len; 765 struct io_recvmsg_multishot_hdr hdr; 766 767 if (kmsg->namelen) 768 kmsg->msg.msg_name = &hdr.addr; 769 kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 770 kmsg->msg.msg_namelen = 0; 771 772 if (sock->file->f_flags & O_NONBLOCK) 773 flags |= MSG_DONTWAIT; 774 775 err = sock_recvmsg(sock, &kmsg->msg, flags); 776 *finished = err <= 0; 777 if (err < 0) 778 return err; 779 780 hdr.msg = (struct io_uring_recvmsg_out) { 781 .controllen = kmsg->controllen - kmsg->msg.msg_controllen, 782 .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT 783 }; 784 785 hdr.msg.payloadlen = err; 786 if (err > kmsg->payloadlen) 787 err = kmsg->payloadlen; 788 789 copy_len = sizeof(struct io_uring_recvmsg_out); 790 if (kmsg->msg.msg_namelen > kmsg->namelen) 791 copy_len += kmsg->namelen; 792 else 793 copy_len += kmsg->msg.msg_namelen; 794 795 /* 796 * "fromlen shall refer to the value before truncation.." 797 * 1003.1g 798 */ 799 hdr.msg.namelen = kmsg->msg.msg_namelen; 800 801 /* ensure that there is no gap between hdr and sockaddr_storage */ 802 BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) != 803 sizeof(struct io_uring_recvmsg_out)); 804 if (copy_to_user(io->buf, &hdr, copy_len)) { 805 *finished = true; 806 return -EFAULT; 807 } 808 809 return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 810 kmsg->controllen + err; 811 } 812 813 int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) 814 { 815 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 816 struct io_async_msghdr iomsg, *kmsg; 817 struct socket *sock; 818 unsigned flags; 819 int ret, min_ret = 0; 820 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 821 bool mshot_finished = true; 822 823 sock = sock_from_file(req->file); 824 if (unlikely(!sock)) 825 return -ENOTSOCK; 826 827 if (req_has_async_data(req)) { 828 kmsg = req->async_data; 829 } else { 830 ret = io_recvmsg_copy_hdr(req, &iomsg); 831 if (ret) 832 return ret; 833 kmsg = &iomsg; 834 } 835 836 if (!(req->flags & REQ_F_POLLED) && 837 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 838 return io_setup_async_msg(req, kmsg, issue_flags); 839 840 if (!io_check_multishot(req, issue_flags)) 841 return io_setup_async_msg(req, kmsg, issue_flags); 842 843 retry_multishot: 844 if (io_do_buffer_select(req)) { 845 void __user *buf; 846 size_t len = sr->len; 847 848 buf = io_buffer_select(req, &len, issue_flags); 849 if (!buf) 850 return -ENOBUFS; 851 852 if (req->flags & REQ_F_APOLL_MULTISHOT) { 853 ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); 854 if (ret) { 855 io_kbuf_recycle(req, issue_flags); 856 return ret; 857 } 858 } 859 860 iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len); 861 } 862 863 flags = sr->msg_flags; 864 if (force_nonblock) 865 flags |= MSG_DONTWAIT; 866 867 kmsg->msg.msg_get_inq = 1; 868 kmsg->msg.msg_inq = -1; 869 if (req->flags & REQ_F_APOLL_MULTISHOT) { 870 ret = io_recvmsg_multishot(sock, sr, kmsg, flags, 871 &mshot_finished); 872 } else { 873 /* disable partial retry for recvmsg with cmsg attached */ 874 if (flags & MSG_WAITALL && !kmsg->msg.msg_controllen) 875 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 876 877 ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, 878 kmsg->uaddr, flags); 879 } 880 881 if (ret < min_ret) { 882 if (ret == -EAGAIN && force_nonblock) { 883 ret = io_setup_async_msg(req, kmsg, issue_flags); 884 if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) { 885 io_kbuf_recycle(req, issue_flags); 886 return IOU_ISSUE_SKIP_COMPLETE; 887 } 888 return ret; 889 } 890 if (ret > 0 && io_net_retry(sock, flags)) { 891 sr->done_io += ret; 892 req->flags |= REQ_F_PARTIAL_IO; 893 return io_setup_async_msg(req, kmsg, issue_flags); 894 } 895 if (ret == -ERESTARTSYS) 896 ret = -EINTR; 897 req_set_fail(req); 898 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 899 req_set_fail(req); 900 } 901 902 if (ret > 0) 903 ret += sr->done_io; 904 else if (sr->done_io) 905 ret = sr->done_io; 906 else 907 io_kbuf_recycle(req, issue_flags); 908 909 if (!io_recv_finish(req, &ret, &kmsg->msg, mshot_finished, issue_flags)) 910 goto retry_multishot; 911 912 if (mshot_finished) { 913 /* fast path, check for non-NULL to avoid function call */ 914 if (kmsg->free_iov) 915 kfree(kmsg->free_iov); 916 io_netmsg_recycle(req, issue_flags); 917 req->flags &= ~REQ_F_NEED_CLEANUP; 918 } else if (ret == -EAGAIN) 919 return io_setup_async_msg(req, kmsg, issue_flags); 920 921 return ret; 922 } 923 924 int io_recv(struct io_kiocb *req, unsigned int issue_flags) 925 { 926 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 927 struct msghdr msg; 928 struct socket *sock; 929 unsigned flags; 930 int ret, min_ret = 0; 931 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 932 size_t len = sr->len; 933 934 if (!(req->flags & REQ_F_POLLED) && 935 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 936 return -EAGAIN; 937 938 if (!io_check_multishot(req, issue_flags)) 939 return -EAGAIN; 940 941 sock = sock_from_file(req->file); 942 if (unlikely(!sock)) 943 return -ENOTSOCK; 944 945 msg.msg_name = NULL; 946 msg.msg_namelen = 0; 947 msg.msg_control = NULL; 948 msg.msg_get_inq = 1; 949 msg.msg_controllen = 0; 950 msg.msg_iocb = NULL; 951 msg.msg_ubuf = NULL; 952 953 retry_multishot: 954 if (io_do_buffer_select(req)) { 955 void __user *buf; 956 957 buf = io_buffer_select(req, &len, issue_flags); 958 if (!buf) 959 return -ENOBUFS; 960 sr->buf = buf; 961 sr->len = len; 962 } 963 964 ret = import_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter); 965 if (unlikely(ret)) 966 goto out_free; 967 968 msg.msg_inq = -1; 969 msg.msg_flags = 0; 970 971 flags = sr->msg_flags; 972 if (force_nonblock) 973 flags |= MSG_DONTWAIT; 974 if (flags & MSG_WAITALL) 975 min_ret = iov_iter_count(&msg.msg_iter); 976 977 ret = sock_recvmsg(sock, &msg, flags); 978 if (ret < min_ret) { 979 if (ret == -EAGAIN && force_nonblock) { 980 if (issue_flags & IO_URING_F_MULTISHOT) { 981 io_kbuf_recycle(req, issue_flags); 982 return IOU_ISSUE_SKIP_COMPLETE; 983 } 984 985 return -EAGAIN; 986 } 987 if (ret > 0 && io_net_retry(sock, flags)) { 988 sr->len -= ret; 989 sr->buf += ret; 990 sr->done_io += ret; 991 req->flags |= REQ_F_PARTIAL_IO; 992 return -EAGAIN; 993 } 994 if (ret == -ERESTARTSYS) 995 ret = -EINTR; 996 req_set_fail(req); 997 } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 998 out_free: 999 req_set_fail(req); 1000 } 1001 1002 if (ret > 0) 1003 ret += sr->done_io; 1004 else if (sr->done_io) 1005 ret = sr->done_io; 1006 else 1007 io_kbuf_recycle(req, issue_flags); 1008 1009 if (!io_recv_finish(req, &ret, &msg, ret <= 0, issue_flags)) 1010 goto retry_multishot; 1011 1012 return ret; 1013 } 1014 1015 void io_send_zc_cleanup(struct io_kiocb *req) 1016 { 1017 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 1018 struct io_async_msghdr *io; 1019 1020 if (req_has_async_data(req)) { 1021 io = req->async_data; 1022 /* might be ->fast_iov if *msg_copy_hdr failed */ 1023 if (io->free_iov != io->fast_iov) 1024 kfree(io->free_iov); 1025 } 1026 if (zc->notif) { 1027 io_notif_flush(zc->notif); 1028 zc->notif = NULL; 1029 } 1030 } 1031 1032 #define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF) 1033 #define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE) 1034 1035 int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1036 { 1037 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 1038 struct io_ring_ctx *ctx = req->ctx; 1039 struct io_kiocb *notif; 1040 1041 if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3))) 1042 return -EINVAL; 1043 /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */ 1044 if (req->flags & REQ_F_CQE_SKIP) 1045 return -EINVAL; 1046 1047 notif = zc->notif = io_alloc_notif(ctx); 1048 if (!notif) 1049 return -ENOMEM; 1050 notif->cqe.user_data = req->cqe.user_data; 1051 notif->cqe.res = 0; 1052 notif->cqe.flags = IORING_CQE_F_NOTIF; 1053 req->flags |= REQ_F_NEED_CLEANUP; 1054 1055 zc->flags = READ_ONCE(sqe->ioprio); 1056 if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) { 1057 if (zc->flags & ~IO_ZC_FLAGS_VALID) 1058 return -EINVAL; 1059 if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) { 1060 io_notif_set_extended(notif); 1061 io_notif_to_data(notif)->zc_report = true; 1062 } 1063 } 1064 1065 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 1066 unsigned idx = READ_ONCE(sqe->buf_index); 1067 1068 if (unlikely(idx >= ctx->nr_user_bufs)) 1069 return -EFAULT; 1070 idx = array_index_nospec(idx, ctx->nr_user_bufs); 1071 req->imu = READ_ONCE(ctx->user_bufs[idx]); 1072 io_req_set_rsrc_node(notif, ctx, 0); 1073 } 1074 1075 if (req->opcode == IORING_OP_SEND_ZC) { 1076 if (READ_ONCE(sqe->__pad3[0])) 1077 return -EINVAL; 1078 zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 1079 zc->addr_len = READ_ONCE(sqe->addr_len); 1080 } else { 1081 if (unlikely(sqe->addr2 || sqe->file_index)) 1082 return -EINVAL; 1083 if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF)) 1084 return -EINVAL; 1085 } 1086 1087 zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1088 zc->len = READ_ONCE(sqe->len); 1089 zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 1090 if (zc->msg_flags & MSG_DONTWAIT) 1091 req->flags |= REQ_F_NOWAIT; 1092 1093 zc->done_io = 0; 1094 1095 #ifdef CONFIG_COMPAT 1096 if (req->ctx->compat) 1097 zc->msg_flags |= MSG_CMSG_COMPAT; 1098 #endif 1099 return 0; 1100 } 1101 1102 static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb, 1103 struct iov_iter *from, size_t length) 1104 { 1105 skb_zcopy_downgrade_managed(skb); 1106 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 1107 } 1108 1109 static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, 1110 struct iov_iter *from, size_t length) 1111 { 1112 struct skb_shared_info *shinfo = skb_shinfo(skb); 1113 int frag = shinfo->nr_frags; 1114 int ret = 0; 1115 struct bvec_iter bi; 1116 ssize_t copied = 0; 1117 unsigned long truesize = 0; 1118 1119 if (!frag) 1120 shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; 1121 else if (unlikely(!skb_zcopy_managed(skb))) 1122 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 1123 1124 bi.bi_size = min(from->count, length); 1125 bi.bi_bvec_done = from->iov_offset; 1126 bi.bi_idx = 0; 1127 1128 while (bi.bi_size && frag < MAX_SKB_FRAGS) { 1129 struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); 1130 1131 copied += v.bv_len; 1132 truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); 1133 __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, 1134 v.bv_offset, v.bv_len); 1135 bvec_iter_advance_single(from->bvec, &bi, v.bv_len); 1136 } 1137 if (bi.bi_size) 1138 ret = -EMSGSIZE; 1139 1140 shinfo->nr_frags = frag; 1141 from->bvec += bi.bi_idx; 1142 from->nr_segs -= bi.bi_idx; 1143 from->count -= copied; 1144 from->iov_offset = bi.bi_bvec_done; 1145 1146 skb->data_len += copied; 1147 skb->len += copied; 1148 skb->truesize += truesize; 1149 1150 if (sk && sk->sk_type == SOCK_STREAM) { 1151 sk_wmem_queued_add(sk, truesize); 1152 if (!skb_zcopy_pure(skb)) 1153 sk_mem_charge(sk, truesize); 1154 } else { 1155 refcount_add(truesize, &skb->sk->sk_wmem_alloc); 1156 } 1157 return ret; 1158 } 1159 1160 int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) 1161 { 1162 struct sockaddr_storage __address; 1163 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 1164 struct msghdr msg; 1165 struct socket *sock; 1166 unsigned msg_flags; 1167 int ret, min_ret = 0; 1168 1169 sock = sock_from_file(req->file); 1170 if (unlikely(!sock)) 1171 return -ENOTSOCK; 1172 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 1173 return -EOPNOTSUPP; 1174 1175 msg.msg_name = NULL; 1176 msg.msg_control = NULL; 1177 msg.msg_controllen = 0; 1178 msg.msg_namelen = 0; 1179 1180 if (zc->addr) { 1181 if (req_has_async_data(req)) { 1182 struct io_async_msghdr *io = req->async_data; 1183 1184 msg.msg_name = &io->addr; 1185 } else { 1186 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); 1187 if (unlikely(ret < 0)) 1188 return ret; 1189 msg.msg_name = (struct sockaddr *)&__address; 1190 } 1191 msg.msg_namelen = zc->addr_len; 1192 } 1193 1194 if (!(req->flags & REQ_F_POLLED) && 1195 (zc->flags & IORING_RECVSEND_POLL_FIRST)) 1196 return io_setup_async_addr(req, &__address, issue_flags); 1197 1198 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 1199 ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu, 1200 (u64)(uintptr_t)zc->buf, zc->len); 1201 if (unlikely(ret)) 1202 return ret; 1203 msg.sg_from_iter = io_sg_from_iter; 1204 } else { 1205 io_notif_set_extended(zc->notif); 1206 ret = import_ubuf(ITER_SOURCE, zc->buf, zc->len, &msg.msg_iter); 1207 if (unlikely(ret)) 1208 return ret; 1209 ret = io_notif_account_mem(zc->notif, zc->len); 1210 if (unlikely(ret)) 1211 return ret; 1212 msg.sg_from_iter = io_sg_from_iter_iovec; 1213 } 1214 1215 msg_flags = zc->msg_flags | MSG_ZEROCOPY; 1216 if (issue_flags & IO_URING_F_NONBLOCK) 1217 msg_flags |= MSG_DONTWAIT; 1218 if (msg_flags & MSG_WAITALL) 1219 min_ret = iov_iter_count(&msg.msg_iter); 1220 msg_flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; 1221 1222 msg.msg_flags = msg_flags; 1223 msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; 1224 ret = sock_sendmsg(sock, &msg); 1225 1226 if (unlikely(ret < min_ret)) { 1227 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1228 return io_setup_async_addr(req, &__address, issue_flags); 1229 1230 if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { 1231 zc->len -= ret; 1232 zc->buf += ret; 1233 zc->done_io += ret; 1234 req->flags |= REQ_F_PARTIAL_IO; 1235 return io_setup_async_addr(req, &__address, issue_flags); 1236 } 1237 if (ret == -ERESTARTSYS) 1238 ret = -EINTR; 1239 req_set_fail(req); 1240 } 1241 1242 if (ret >= 0) 1243 ret += zc->done_io; 1244 else if (zc->done_io) 1245 ret = zc->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(zc->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 int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags) 1260 { 1261 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 1262 struct io_async_msghdr iomsg, *kmsg; 1263 struct socket *sock; 1264 unsigned flags; 1265 int ret, min_ret = 0; 1266 1267 io_notif_set_extended(sr->notif); 1268 1269 sock = sock_from_file(req->file); 1270 if (unlikely(!sock)) 1271 return -ENOTSOCK; 1272 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 1273 return -EOPNOTSUPP; 1274 1275 if (req_has_async_data(req)) { 1276 kmsg = req->async_data; 1277 } else { 1278 ret = io_sendmsg_copy_hdr(req, &iomsg); 1279 if (ret) 1280 return ret; 1281 kmsg = &iomsg; 1282 } 1283 1284 if (!(req->flags & REQ_F_POLLED) && 1285 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 1286 return io_setup_async_msg(req, kmsg, issue_flags); 1287 1288 flags = sr->msg_flags | MSG_ZEROCOPY; 1289 if (issue_flags & IO_URING_F_NONBLOCK) 1290 flags |= MSG_DONTWAIT; 1291 if (flags & MSG_WAITALL) 1292 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 1293 1294 kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg; 1295 kmsg->msg.sg_from_iter = io_sg_from_iter_iovec; 1296 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 1297 1298 if (unlikely(ret < min_ret)) { 1299 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1300 return io_setup_async_msg(req, kmsg, issue_flags); 1301 1302 if (ret > 0 && io_net_retry(sock, flags)) { 1303 sr->done_io += ret; 1304 req->flags |= REQ_F_PARTIAL_IO; 1305 return io_setup_async_msg(req, kmsg, issue_flags); 1306 } 1307 if (ret == -ERESTARTSYS) 1308 ret = -EINTR; 1309 req_set_fail(req); 1310 } 1311 /* fast path, check for non-NULL to avoid function call */ 1312 if (kmsg->free_iov) { 1313 kfree(kmsg->free_iov); 1314 kmsg->free_iov = NULL; 1315 } 1316 1317 io_netmsg_recycle(req, issue_flags); 1318 if (ret >= 0) 1319 ret += sr->done_io; 1320 else if (sr->done_io) 1321 ret = sr->done_io; 1322 1323 /* 1324 * If we're in io-wq we can't rely on tw ordering guarantees, defer 1325 * flushing notif to io_send_zc_cleanup() 1326 */ 1327 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 1328 io_notif_flush(sr->notif); 1329 req->flags &= ~REQ_F_NEED_CLEANUP; 1330 } 1331 io_req_set_res(req, ret, IORING_CQE_F_MORE); 1332 return IOU_OK; 1333 } 1334 1335 void io_sendrecv_fail(struct io_kiocb *req) 1336 { 1337 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 1338 1339 if (req->flags & REQ_F_PARTIAL_IO) 1340 req->cqe.res = sr->done_io; 1341 1342 if ((req->flags & REQ_F_NEED_CLEANUP) && 1343 (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) 1344 req->cqe.flags |= IORING_CQE_F_MORE; 1345 } 1346 1347 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1348 { 1349 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1350 unsigned flags; 1351 1352 if (sqe->len || sqe->buf_index) 1353 return -EINVAL; 1354 1355 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1356 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 1357 accept->flags = READ_ONCE(sqe->accept_flags); 1358 accept->nofile = rlimit(RLIMIT_NOFILE); 1359 flags = READ_ONCE(sqe->ioprio); 1360 if (flags & ~IORING_ACCEPT_MULTISHOT) 1361 return -EINVAL; 1362 1363 accept->file_slot = READ_ONCE(sqe->file_index); 1364 if (accept->file_slot) { 1365 if (accept->flags & SOCK_CLOEXEC) 1366 return -EINVAL; 1367 if (flags & IORING_ACCEPT_MULTISHOT && 1368 accept->file_slot != IORING_FILE_INDEX_ALLOC) 1369 return -EINVAL; 1370 } 1371 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1372 return -EINVAL; 1373 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) 1374 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1375 if (flags & IORING_ACCEPT_MULTISHOT) 1376 req->flags |= REQ_F_APOLL_MULTISHOT; 1377 return 0; 1378 } 1379 1380 int io_accept(struct io_kiocb *req, unsigned int issue_flags) 1381 { 1382 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1383 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1384 unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; 1385 bool fixed = !!accept->file_slot; 1386 struct file *file; 1387 int ret, fd; 1388 1389 if (!io_check_multishot(req, issue_flags)) 1390 return -EAGAIN; 1391 retry: 1392 if (!fixed) { 1393 fd = __get_unused_fd_flags(accept->flags, accept->nofile); 1394 if (unlikely(fd < 0)) 1395 return fd; 1396 } 1397 file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, 1398 accept->flags); 1399 if (IS_ERR(file)) { 1400 if (!fixed) 1401 put_unused_fd(fd); 1402 ret = PTR_ERR(file); 1403 if (ret == -EAGAIN && force_nonblock) { 1404 /* 1405 * if it's multishot and polled, we don't need to 1406 * return EAGAIN to arm the poll infra since it 1407 * has already been done 1408 */ 1409 if (issue_flags & IO_URING_F_MULTISHOT) 1410 return IOU_ISSUE_SKIP_COMPLETE; 1411 return ret; 1412 } 1413 if (ret == -ERESTARTSYS) 1414 ret = -EINTR; 1415 req_set_fail(req); 1416 } else if (!fixed) { 1417 fd_install(fd, file); 1418 ret = fd; 1419 } else { 1420 ret = io_fixed_fd_install(req, issue_flags, file, 1421 accept->file_slot); 1422 } 1423 1424 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 1425 io_req_set_res(req, ret, 0); 1426 return IOU_OK; 1427 } 1428 1429 if (ret < 0) 1430 return ret; 1431 if (io_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER, 1432 ret, IORING_CQE_F_MORE)) 1433 goto retry; 1434 1435 io_req_set_res(req, ret, 0); 1436 return IOU_STOP_MULTISHOT; 1437 } 1438 1439 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1440 { 1441 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1442 1443 if (sqe->addr || sqe->rw_flags || sqe->buf_index) 1444 return -EINVAL; 1445 1446 sock->domain = READ_ONCE(sqe->fd); 1447 sock->type = READ_ONCE(sqe->off); 1448 sock->protocol = READ_ONCE(sqe->len); 1449 sock->file_slot = READ_ONCE(sqe->file_index); 1450 sock->nofile = rlimit(RLIMIT_NOFILE); 1451 1452 sock->flags = sock->type & ~SOCK_TYPE_MASK; 1453 if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) 1454 return -EINVAL; 1455 if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1456 return -EINVAL; 1457 return 0; 1458 } 1459 1460 int io_socket(struct io_kiocb *req, unsigned int issue_flags) 1461 { 1462 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1463 bool fixed = !!sock->file_slot; 1464 struct file *file; 1465 int ret, fd; 1466 1467 if (!fixed) { 1468 fd = __get_unused_fd_flags(sock->flags, sock->nofile); 1469 if (unlikely(fd < 0)) 1470 return fd; 1471 } 1472 file = __sys_socket_file(sock->domain, sock->type, sock->protocol); 1473 if (IS_ERR(file)) { 1474 if (!fixed) 1475 put_unused_fd(fd); 1476 ret = PTR_ERR(file); 1477 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1478 return -EAGAIN; 1479 if (ret == -ERESTARTSYS) 1480 ret = -EINTR; 1481 req_set_fail(req); 1482 } else if (!fixed) { 1483 fd_install(fd, file); 1484 ret = fd; 1485 } else { 1486 ret = io_fixed_fd_install(req, issue_flags, file, 1487 sock->file_slot); 1488 } 1489 io_req_set_res(req, ret, 0); 1490 return IOU_OK; 1491 } 1492 1493 int io_connect_prep_async(struct io_kiocb *req) 1494 { 1495 struct io_async_connect *io = req->async_data; 1496 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1497 1498 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); 1499 } 1500 1501 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1502 { 1503 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1504 1505 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) 1506 return -EINVAL; 1507 1508 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1509 conn->addr_len = READ_ONCE(sqe->addr2); 1510 conn->in_progress = conn->seen_econnaborted = false; 1511 return 0; 1512 } 1513 1514 int io_connect(struct io_kiocb *req, unsigned int issue_flags) 1515 { 1516 struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); 1517 struct io_async_connect __io, *io; 1518 unsigned file_flags; 1519 int ret; 1520 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1521 1522 if (req_has_async_data(req)) { 1523 io = req->async_data; 1524 } else { 1525 ret = move_addr_to_kernel(connect->addr, 1526 connect->addr_len, 1527 &__io.address); 1528 if (ret) 1529 goto out; 1530 io = &__io; 1531 } 1532 1533 file_flags = force_nonblock ? O_NONBLOCK : 0; 1534 1535 ret = __sys_connect_file(req->file, &io->address, 1536 connect->addr_len, file_flags); 1537 if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED) 1538 && force_nonblock) { 1539 if (ret == -EINPROGRESS) { 1540 connect->in_progress = true; 1541 } else if (ret == -ECONNABORTED) { 1542 if (connect->seen_econnaborted) 1543 goto out; 1544 connect->seen_econnaborted = true; 1545 } 1546 if (req_has_async_data(req)) 1547 return -EAGAIN; 1548 if (io_alloc_async_data(req)) { 1549 ret = -ENOMEM; 1550 goto out; 1551 } 1552 memcpy(req->async_data, &__io, sizeof(__io)); 1553 return -EAGAIN; 1554 } 1555 if (connect->in_progress) { 1556 /* 1557 * At least bluetooth will return -EBADFD on a re-connect 1558 * attempt, and it's (supposedly) also valid to get -EISCONN 1559 * which means the previous result is good. For both of these, 1560 * grab the sock_error() and use that for the completion. 1561 */ 1562 if (ret == -EBADFD || ret == -EISCONN) 1563 ret = sock_error(sock_from_file(req->file)->sk); 1564 } 1565 if (ret == -ERESTARTSYS) 1566 ret = -EINTR; 1567 out: 1568 if (ret < 0) 1569 req_set_fail(req); 1570 io_req_set_res(req, ret, 0); 1571 return IOU_OK; 1572 } 1573 1574 void io_netmsg_cache_free(struct io_cache_entry *entry) 1575 { 1576 kfree(container_of(entry, struct io_async_msghdr, cache)); 1577 } 1578 #endif 1579