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 void __user *msg_control; 69 /* used only for send zerocopy */ 70 struct io_kiocb *notif; 71 }; 72 73 static inline bool io_check_multishot(struct io_kiocb *req, 74 unsigned int issue_flags) 75 { 76 /* 77 * When ->locked_cq is set we only allow to post CQEs from the original 78 * task context. Usual request completions will be handled in other 79 * generic paths but multipoll may decide to post extra cqes. 80 */ 81 return !(issue_flags & IO_URING_F_IOWQ) || 82 !(issue_flags & IO_URING_F_MULTISHOT) || 83 !req->ctx->task_complete; 84 } 85 86 int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 87 { 88 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 89 90 if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || 91 sqe->buf_index || sqe->splice_fd_in)) 92 return -EINVAL; 93 94 shutdown->how = READ_ONCE(sqe->len); 95 req->flags |= REQ_F_FORCE_ASYNC; 96 return 0; 97 } 98 99 int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) 100 { 101 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); 102 struct socket *sock; 103 int ret; 104 105 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); 106 107 sock = sock_from_file(req->file); 108 if (unlikely(!sock)) 109 return -ENOTSOCK; 110 111 ret = __sys_shutdown_sock(sock, shutdown->how); 112 io_req_set_res(req, ret, 0); 113 return IOU_OK; 114 } 115 116 static bool io_net_retry(struct socket *sock, int flags) 117 { 118 if (!(flags & MSG_WAITALL)) 119 return false; 120 return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; 121 } 122 123 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) 124 { 125 struct io_async_msghdr *hdr = req->async_data; 126 127 if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) 128 return; 129 130 /* Let normal cleanup path reap it if we fail adding to the cache */ 131 if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { 132 req->async_data = NULL; 133 req->flags &= ~REQ_F_ASYNC_DATA; 134 } 135 } 136 137 static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req, 138 unsigned int issue_flags) 139 { 140 struct io_ring_ctx *ctx = req->ctx; 141 struct io_cache_entry *entry; 142 struct io_async_msghdr *hdr; 143 144 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 145 entry = io_alloc_cache_get(&ctx->netmsg_cache); 146 if (entry) { 147 hdr = container_of(entry, struct io_async_msghdr, cache); 148 hdr->free_iov = NULL; 149 req->flags |= REQ_F_ASYNC_DATA; 150 req->async_data = hdr; 151 return hdr; 152 } 153 } 154 155 if (!io_alloc_async_data(req)) { 156 hdr = req->async_data; 157 hdr->free_iov = NULL; 158 return hdr; 159 } 160 return NULL; 161 } 162 163 static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req) 164 { 165 /* ->prep_async is always called from the submission context */ 166 return io_msg_alloc_async(req, 0); 167 } 168 169 static int io_setup_async_msg(struct io_kiocb *req, 170 struct io_async_msghdr *kmsg, 171 unsigned int issue_flags) 172 { 173 struct io_async_msghdr *async_msg; 174 175 if (req_has_async_data(req)) 176 return -EAGAIN; 177 async_msg = io_msg_alloc_async(req, issue_flags); 178 if (!async_msg) { 179 kfree(kmsg->free_iov); 180 return -ENOMEM; 181 } 182 req->flags |= REQ_F_NEED_CLEANUP; 183 memcpy(async_msg, kmsg, sizeof(*kmsg)); 184 if (async_msg->msg.msg_name) 185 async_msg->msg.msg_name = &async_msg->addr; 186 /* if were using fast_iov, set it to the new one */ 187 if (iter_is_iovec(&kmsg->msg.msg_iter) && !kmsg->free_iov) { 188 size_t fast_idx = iter_iov(&kmsg->msg.msg_iter) - kmsg->fast_iov; 189 async_msg->msg.msg_iter.__iov = &async_msg->fast_iov[fast_idx]; 190 } 191 192 return -EAGAIN; 193 } 194 195 static int io_sendmsg_copy_hdr(struct io_kiocb *req, 196 struct io_async_msghdr *iomsg) 197 { 198 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 199 int ret; 200 201 iomsg->msg.msg_name = &iomsg->addr; 202 iomsg->free_iov = iomsg->fast_iov; 203 ret = sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, 204 &iomsg->free_iov); 205 /* save msg_control as sys_sendmsg() overwrites it */ 206 sr->msg_control = iomsg->msg.msg_control_user; 207 return ret; 208 } 209 210 int io_send_prep_async(struct io_kiocb *req) 211 { 212 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 213 struct io_async_msghdr *io; 214 int ret; 215 216 if (!zc->addr || req_has_async_data(req)) 217 return 0; 218 io = io_msg_alloc_async_prep(req); 219 if (!io) 220 return -ENOMEM; 221 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); 222 return ret; 223 } 224 225 static int io_setup_async_addr(struct io_kiocb *req, 226 struct sockaddr_storage *addr_storage, 227 unsigned int issue_flags) 228 { 229 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 230 struct io_async_msghdr *io; 231 232 if (!sr->addr || req_has_async_data(req)) 233 return -EAGAIN; 234 io = io_msg_alloc_async(req, issue_flags); 235 if (!io) 236 return -ENOMEM; 237 memcpy(&io->addr, addr_storage, sizeof(io->addr)); 238 return -EAGAIN; 239 } 240 241 int io_sendmsg_prep_async(struct io_kiocb *req) 242 { 243 int ret; 244 245 if (!io_msg_alloc_async_prep(req)) 246 return -ENOMEM; 247 ret = io_sendmsg_copy_hdr(req, req->async_data); 248 if (!ret) 249 req->flags |= REQ_F_NEED_CLEANUP; 250 return ret; 251 } 252 253 void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) 254 { 255 struct io_async_msghdr *io = req->async_data; 256 257 kfree(io->free_iov); 258 } 259 260 int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 261 { 262 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 263 264 if (req->opcode == IORING_OP_SEND) { 265 if (READ_ONCE(sqe->__pad3[0])) 266 return -EINVAL; 267 sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 268 sr->addr_len = READ_ONCE(sqe->addr_len); 269 } else if (sqe->addr2 || sqe->file_index) { 270 return -EINVAL; 271 } 272 273 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 274 sr->len = READ_ONCE(sqe->len); 275 sr->flags = READ_ONCE(sqe->ioprio); 276 if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) 277 return -EINVAL; 278 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 279 if (sr->msg_flags & MSG_DONTWAIT) 280 req->flags |= REQ_F_NOWAIT; 281 282 #ifdef CONFIG_COMPAT 283 if (req->ctx->compat) 284 sr->msg_flags |= MSG_CMSG_COMPAT; 285 #endif 286 sr->done_io = 0; 287 return 0; 288 } 289 290 int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) 291 { 292 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 293 struct io_async_msghdr iomsg, *kmsg; 294 struct socket *sock; 295 unsigned flags; 296 int min_ret = 0; 297 int ret; 298 299 sock = sock_from_file(req->file); 300 if (unlikely(!sock)) 301 return -ENOTSOCK; 302 303 if (req_has_async_data(req)) { 304 kmsg = req->async_data; 305 kmsg->msg.msg_control_user = sr->msg_control; 306 } else { 307 ret = io_sendmsg_copy_hdr(req, &iomsg); 308 if (ret) 309 return ret; 310 kmsg = &iomsg; 311 } 312 313 if (!(req->flags & REQ_F_POLLED) && 314 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 315 return io_setup_async_msg(req, kmsg, issue_flags); 316 317 flags = sr->msg_flags; 318 if (issue_flags & IO_URING_F_NONBLOCK) 319 flags |= MSG_DONTWAIT; 320 if (flags & MSG_WAITALL) 321 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 322 323 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 324 325 if (ret < min_ret) { 326 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 327 return io_setup_async_msg(req, kmsg, issue_flags); 328 if (ret > 0 && io_net_retry(sock, flags)) { 329 kmsg->msg.msg_controllen = 0; 330 kmsg->msg.msg_control = NULL; 331 sr->done_io += ret; 332 req->flags |= REQ_F_PARTIAL_IO; 333 return io_setup_async_msg(req, kmsg, issue_flags); 334 } 335 if (ret == -ERESTARTSYS) 336 ret = -EINTR; 337 req_set_fail(req); 338 } 339 /* fast path, check for non-NULL to avoid function call */ 340 if (kmsg->free_iov) 341 kfree(kmsg->free_iov); 342 req->flags &= ~REQ_F_NEED_CLEANUP; 343 io_netmsg_recycle(req, issue_flags); 344 if (ret >= 0) 345 ret += sr->done_io; 346 else if (sr->done_io) 347 ret = sr->done_io; 348 io_req_set_res(req, ret, 0); 349 return IOU_OK; 350 } 351 352 int io_send(struct io_kiocb *req, unsigned int issue_flags) 353 { 354 struct sockaddr_storage __address; 355 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 356 struct msghdr msg; 357 struct socket *sock; 358 unsigned flags; 359 int min_ret = 0; 360 int ret; 361 362 msg.msg_name = NULL; 363 msg.msg_control = NULL; 364 msg.msg_controllen = 0; 365 msg.msg_namelen = 0; 366 msg.msg_ubuf = NULL; 367 368 if (sr->addr) { 369 if (req_has_async_data(req)) { 370 struct io_async_msghdr *io = req->async_data; 371 372 msg.msg_name = &io->addr; 373 } else { 374 ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address); 375 if (unlikely(ret < 0)) 376 return ret; 377 msg.msg_name = (struct sockaddr *)&__address; 378 } 379 msg.msg_namelen = sr->addr_len; 380 } 381 382 if (!(req->flags & REQ_F_POLLED) && 383 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 384 return io_setup_async_addr(req, &__address, issue_flags); 385 386 sock = sock_from_file(req->file); 387 if (unlikely(!sock)) 388 return -ENOTSOCK; 389 390 ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter); 391 if (unlikely(ret)) 392 return ret; 393 394 flags = sr->msg_flags; 395 if (issue_flags & IO_URING_F_NONBLOCK) 396 flags |= MSG_DONTWAIT; 397 if (flags & MSG_WAITALL) 398 min_ret = iov_iter_count(&msg.msg_iter); 399 400 flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; 401 msg.msg_flags = flags; 402 ret = sock_sendmsg(sock, &msg); 403 if (ret < min_ret) { 404 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 405 return io_setup_async_addr(req, &__address, issue_flags); 406 407 if (ret > 0 && io_net_retry(sock, flags)) { 408 sr->len -= ret; 409 sr->buf += ret; 410 sr->done_io += ret; 411 req->flags |= REQ_F_PARTIAL_IO; 412 return io_setup_async_addr(req, &__address, issue_flags); 413 } 414 if (ret == -ERESTARTSYS) 415 ret = -EINTR; 416 req_set_fail(req); 417 } 418 if (ret >= 0) 419 ret += sr->done_io; 420 else if (sr->done_io) 421 ret = sr->done_io; 422 io_req_set_res(req, ret, 0); 423 return IOU_OK; 424 } 425 426 static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) 427 { 428 int hdr; 429 430 if (iomsg->namelen < 0) 431 return true; 432 if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), 433 iomsg->namelen, &hdr)) 434 return true; 435 if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) 436 return true; 437 438 return false; 439 } 440 441 static int __io_recvmsg_copy_hdr(struct io_kiocb *req, 442 struct io_async_msghdr *iomsg) 443 { 444 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 445 struct user_msghdr msg; 446 int ret; 447 448 if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) 449 return -EFAULT; 450 451 ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 452 if (ret) 453 return ret; 454 455 if (req->flags & REQ_F_BUFFER_SELECT) { 456 if (msg.msg_iovlen == 0) { 457 sr->len = iomsg->fast_iov[0].iov_len = 0; 458 iomsg->fast_iov[0].iov_base = NULL; 459 iomsg->free_iov = NULL; 460 } else if (msg.msg_iovlen > 1) { 461 return -EINVAL; 462 } else { 463 if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) 464 return -EFAULT; 465 sr->len = iomsg->fast_iov[0].iov_len; 466 iomsg->free_iov = NULL; 467 } 468 469 if (req->flags & REQ_F_APOLL_MULTISHOT) { 470 iomsg->namelen = msg.msg_namelen; 471 iomsg->controllen = msg.msg_controllen; 472 if (io_recvmsg_multishot_overflow(iomsg)) 473 return -EOVERFLOW; 474 } 475 } else { 476 iomsg->free_iov = iomsg->fast_iov; 477 ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, 478 &iomsg->free_iov, &iomsg->msg.msg_iter, 479 false); 480 if (ret > 0) 481 ret = 0; 482 } 483 484 return ret; 485 } 486 487 #ifdef CONFIG_COMPAT 488 static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, 489 struct io_async_msghdr *iomsg) 490 { 491 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 492 struct compat_msghdr msg; 493 struct compat_iovec __user *uiov; 494 int ret; 495 496 if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) 497 return -EFAULT; 498 499 ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); 500 if (ret) 501 return ret; 502 503 uiov = compat_ptr(msg.msg_iov); 504 if (req->flags & REQ_F_BUFFER_SELECT) { 505 compat_ssize_t clen; 506 507 iomsg->free_iov = NULL; 508 if (msg.msg_iovlen == 0) { 509 sr->len = 0; 510 } else if (msg.msg_iovlen > 1) { 511 return -EINVAL; 512 } else { 513 if (!access_ok(uiov, sizeof(*uiov))) 514 return -EFAULT; 515 if (__get_user(clen, &uiov->iov_len)) 516 return -EFAULT; 517 if (clen < 0) 518 return -EINVAL; 519 sr->len = clen; 520 } 521 522 if (req->flags & REQ_F_APOLL_MULTISHOT) { 523 iomsg->namelen = msg.msg_namelen; 524 iomsg->controllen = msg.msg_controllen; 525 if (io_recvmsg_multishot_overflow(iomsg)) 526 return -EOVERFLOW; 527 } 528 } else { 529 iomsg->free_iov = iomsg->fast_iov; 530 ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen, 531 UIO_FASTIOV, &iomsg->free_iov, 532 &iomsg->msg.msg_iter, true); 533 if (ret < 0) 534 return ret; 535 } 536 537 return 0; 538 } 539 #endif 540 541 static int io_recvmsg_copy_hdr(struct io_kiocb *req, 542 struct io_async_msghdr *iomsg) 543 { 544 iomsg->msg.msg_name = &iomsg->addr; 545 546 #ifdef CONFIG_COMPAT 547 if (req->ctx->compat) 548 return __io_compat_recvmsg_copy_hdr(req, iomsg); 549 #endif 550 551 return __io_recvmsg_copy_hdr(req, iomsg); 552 } 553 554 int io_recvmsg_prep_async(struct io_kiocb *req) 555 { 556 int ret; 557 558 if (!io_msg_alloc_async_prep(req)) 559 return -ENOMEM; 560 ret = io_recvmsg_copy_hdr(req, req->async_data); 561 if (!ret) 562 req->flags |= REQ_F_NEED_CLEANUP; 563 return ret; 564 } 565 566 #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) 567 568 int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 569 { 570 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 571 572 if (unlikely(sqe->file_index || sqe->addr2)) 573 return -EINVAL; 574 575 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); 576 sr->len = READ_ONCE(sqe->len); 577 sr->flags = READ_ONCE(sqe->ioprio); 578 if (sr->flags & ~(RECVMSG_FLAGS)) 579 return -EINVAL; 580 sr->msg_flags = READ_ONCE(sqe->msg_flags); 581 if (sr->msg_flags & MSG_DONTWAIT) 582 req->flags |= REQ_F_NOWAIT; 583 if (sr->msg_flags & MSG_ERRQUEUE) 584 req->flags |= REQ_F_CLEAR_POLLIN; 585 if (sr->flags & IORING_RECV_MULTISHOT) { 586 if (!(req->flags & REQ_F_BUFFER_SELECT)) 587 return -EINVAL; 588 if (sr->msg_flags & MSG_WAITALL) 589 return -EINVAL; 590 if (req->opcode == IORING_OP_RECV && sr->len) 591 return -EINVAL; 592 req->flags |= REQ_F_APOLL_MULTISHOT; 593 /* 594 * Store the buffer group for this multishot receive separately, 595 * as if we end up doing an io-wq based issue that selects a 596 * buffer, it has to be committed immediately and that will 597 * clear ->buf_list. This means we lose the link to the buffer 598 * list, and the eventual buffer put on completion then cannot 599 * restore it. 600 */ 601 sr->buf_group = req->buf_index; 602 } 603 604 #ifdef CONFIG_COMPAT 605 if (req->ctx->compat) 606 sr->msg_flags |= MSG_CMSG_COMPAT; 607 #endif 608 sr->done_io = 0; 609 return 0; 610 } 611 612 static inline void io_recv_prep_retry(struct io_kiocb *req) 613 { 614 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 615 616 sr->done_io = 0; 617 sr->len = 0; /* get from the provided buffer */ 618 req->buf_index = sr->buf_group; 619 } 620 621 /* 622 * Finishes io_recv and io_recvmsg. 623 * 624 * Returns true if it is actually finished, or false if it should run 625 * again (for multishot). 626 */ 627 static inline bool io_recv_finish(struct io_kiocb *req, int *ret, 628 struct msghdr *msg, bool mshot_finished, 629 unsigned issue_flags) 630 { 631 unsigned int cflags; 632 633 cflags = io_put_kbuf(req, issue_flags); 634 if (msg->msg_inq && msg->msg_inq != -1) 635 cflags |= IORING_CQE_F_SOCK_NONEMPTY; 636 637 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 638 io_req_set_res(req, *ret, cflags); 639 *ret = IOU_OK; 640 return true; 641 } 642 643 if (!mshot_finished) { 644 if (io_aux_cqe(req, issue_flags & IO_URING_F_COMPLETE_DEFER, 645 *ret, cflags | IORING_CQE_F_MORE, true)) { 646 io_recv_prep_retry(req); 647 /* Known not-empty or unknown state, retry */ 648 if (cflags & IORING_CQE_F_SOCK_NONEMPTY || 649 msg->msg_inq == -1) 650 return false; 651 if (issue_flags & IO_URING_F_MULTISHOT) 652 *ret = IOU_ISSUE_SKIP_COMPLETE; 653 else 654 *ret = -EAGAIN; 655 return true; 656 } 657 /* Otherwise stop multishot but use the current result. */ 658 } 659 660 io_req_set_res(req, *ret, cflags); 661 662 if (issue_flags & IO_URING_F_MULTISHOT) 663 *ret = IOU_STOP_MULTISHOT; 664 else 665 *ret = IOU_OK; 666 return true; 667 } 668 669 static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg, 670 struct io_sr_msg *sr, void __user **buf, 671 size_t *len) 672 { 673 unsigned long ubuf = (unsigned long) *buf; 674 unsigned long hdr; 675 676 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 677 kmsg->controllen; 678 if (*len < hdr) 679 return -EFAULT; 680 681 if (kmsg->controllen) { 682 unsigned long control = ubuf + hdr - kmsg->controllen; 683 684 kmsg->msg.msg_control_user = (void __user *) control; 685 kmsg->msg.msg_controllen = kmsg->controllen; 686 } 687 688 sr->buf = *buf; /* stash for later copy */ 689 *buf = (void __user *) (ubuf + hdr); 690 kmsg->payloadlen = *len = *len - hdr; 691 return 0; 692 } 693 694 struct io_recvmsg_multishot_hdr { 695 struct io_uring_recvmsg_out msg; 696 struct sockaddr_storage addr; 697 }; 698 699 static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io, 700 struct io_async_msghdr *kmsg, 701 unsigned int flags, bool *finished) 702 { 703 int err; 704 int copy_len; 705 struct io_recvmsg_multishot_hdr hdr; 706 707 if (kmsg->namelen) 708 kmsg->msg.msg_name = &hdr.addr; 709 kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); 710 kmsg->msg.msg_namelen = 0; 711 712 if (sock->file->f_flags & O_NONBLOCK) 713 flags |= MSG_DONTWAIT; 714 715 err = sock_recvmsg(sock, &kmsg->msg, flags); 716 *finished = err <= 0; 717 if (err < 0) 718 return err; 719 720 hdr.msg = (struct io_uring_recvmsg_out) { 721 .controllen = kmsg->controllen - kmsg->msg.msg_controllen, 722 .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT 723 }; 724 725 hdr.msg.payloadlen = err; 726 if (err > kmsg->payloadlen) 727 err = kmsg->payloadlen; 728 729 copy_len = sizeof(struct io_uring_recvmsg_out); 730 if (kmsg->msg.msg_namelen > kmsg->namelen) 731 copy_len += kmsg->namelen; 732 else 733 copy_len += kmsg->msg.msg_namelen; 734 735 /* 736 * "fromlen shall refer to the value before truncation.." 737 * 1003.1g 738 */ 739 hdr.msg.namelen = kmsg->msg.msg_namelen; 740 741 /* ensure that there is no gap between hdr and sockaddr_storage */ 742 BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) != 743 sizeof(struct io_uring_recvmsg_out)); 744 if (copy_to_user(io->buf, &hdr, copy_len)) { 745 *finished = true; 746 return -EFAULT; 747 } 748 749 return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + 750 kmsg->controllen + err; 751 } 752 753 int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) 754 { 755 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 756 struct io_async_msghdr iomsg, *kmsg; 757 struct socket *sock; 758 unsigned flags; 759 int ret, min_ret = 0; 760 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 761 bool mshot_finished = true; 762 763 sock = sock_from_file(req->file); 764 if (unlikely(!sock)) 765 return -ENOTSOCK; 766 767 if (req_has_async_data(req)) { 768 kmsg = req->async_data; 769 } else { 770 ret = io_recvmsg_copy_hdr(req, &iomsg); 771 if (ret) 772 return ret; 773 kmsg = &iomsg; 774 } 775 776 if (!(req->flags & REQ_F_POLLED) && 777 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 778 return io_setup_async_msg(req, kmsg, issue_flags); 779 780 if (!io_check_multishot(req, issue_flags)) 781 return io_setup_async_msg(req, kmsg, issue_flags); 782 783 retry_multishot: 784 if (io_do_buffer_select(req)) { 785 void __user *buf; 786 size_t len = sr->len; 787 788 buf = io_buffer_select(req, &len, issue_flags); 789 if (!buf) 790 return -ENOBUFS; 791 792 if (req->flags & REQ_F_APOLL_MULTISHOT) { 793 ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); 794 if (ret) { 795 io_kbuf_recycle(req, issue_flags); 796 return ret; 797 } 798 } 799 800 iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len); 801 } 802 803 flags = sr->msg_flags; 804 if (force_nonblock) 805 flags |= MSG_DONTWAIT; 806 807 kmsg->msg.msg_get_inq = 1; 808 kmsg->msg.msg_inq = -1; 809 if (req->flags & REQ_F_APOLL_MULTISHOT) { 810 ret = io_recvmsg_multishot(sock, sr, kmsg, flags, 811 &mshot_finished); 812 } else { 813 /* disable partial retry for recvmsg with cmsg attached */ 814 if (flags & MSG_WAITALL && !kmsg->msg.msg_controllen) 815 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 816 817 ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, 818 kmsg->uaddr, flags); 819 } 820 821 if (ret < min_ret) { 822 if (ret == -EAGAIN && force_nonblock) { 823 ret = io_setup_async_msg(req, kmsg, issue_flags); 824 if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) { 825 io_kbuf_recycle(req, issue_flags); 826 return IOU_ISSUE_SKIP_COMPLETE; 827 } 828 return ret; 829 } 830 if (ret > 0 && io_net_retry(sock, flags)) { 831 sr->done_io += ret; 832 req->flags |= REQ_F_PARTIAL_IO; 833 return io_setup_async_msg(req, kmsg, issue_flags); 834 } 835 if (ret == -ERESTARTSYS) 836 ret = -EINTR; 837 req_set_fail(req); 838 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 839 req_set_fail(req); 840 } 841 842 if (ret > 0) 843 ret += sr->done_io; 844 else if (sr->done_io) 845 ret = sr->done_io; 846 else 847 io_kbuf_recycle(req, issue_flags); 848 849 if (!io_recv_finish(req, &ret, &kmsg->msg, mshot_finished, issue_flags)) 850 goto retry_multishot; 851 852 if (mshot_finished) { 853 /* fast path, check for non-NULL to avoid function call */ 854 if (kmsg->free_iov) 855 kfree(kmsg->free_iov); 856 io_netmsg_recycle(req, issue_flags); 857 req->flags &= ~REQ_F_NEED_CLEANUP; 858 } 859 860 return ret; 861 } 862 863 int io_recv(struct io_kiocb *req, unsigned int issue_flags) 864 { 865 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 866 struct msghdr msg; 867 struct socket *sock; 868 unsigned flags; 869 int ret, min_ret = 0; 870 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 871 size_t len = sr->len; 872 873 if (!(req->flags & REQ_F_POLLED) && 874 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 875 return -EAGAIN; 876 877 if (!io_check_multishot(req, issue_flags)) 878 return -EAGAIN; 879 880 sock = sock_from_file(req->file); 881 if (unlikely(!sock)) 882 return -ENOTSOCK; 883 884 msg.msg_name = NULL; 885 msg.msg_namelen = 0; 886 msg.msg_control = NULL; 887 msg.msg_get_inq = 1; 888 msg.msg_controllen = 0; 889 msg.msg_iocb = NULL; 890 msg.msg_ubuf = NULL; 891 892 retry_multishot: 893 if (io_do_buffer_select(req)) { 894 void __user *buf; 895 896 buf = io_buffer_select(req, &len, issue_flags); 897 if (!buf) 898 return -ENOBUFS; 899 sr->buf = buf; 900 } 901 902 ret = import_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter); 903 if (unlikely(ret)) 904 goto out_free; 905 906 msg.msg_inq = -1; 907 msg.msg_flags = 0; 908 909 flags = sr->msg_flags; 910 if (force_nonblock) 911 flags |= MSG_DONTWAIT; 912 if (flags & MSG_WAITALL) 913 min_ret = iov_iter_count(&msg.msg_iter); 914 915 ret = sock_recvmsg(sock, &msg, flags); 916 if (ret < min_ret) { 917 if (ret == -EAGAIN && force_nonblock) { 918 if (issue_flags & IO_URING_F_MULTISHOT) { 919 io_kbuf_recycle(req, issue_flags); 920 return IOU_ISSUE_SKIP_COMPLETE; 921 } 922 923 return -EAGAIN; 924 } 925 if (ret > 0 && io_net_retry(sock, flags)) { 926 sr->len -= ret; 927 sr->buf += ret; 928 sr->done_io += ret; 929 req->flags |= REQ_F_PARTIAL_IO; 930 return -EAGAIN; 931 } 932 if (ret == -ERESTARTSYS) 933 ret = -EINTR; 934 req_set_fail(req); 935 } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { 936 out_free: 937 req_set_fail(req); 938 } 939 940 if (ret > 0) 941 ret += sr->done_io; 942 else if (sr->done_io) 943 ret = sr->done_io; 944 else 945 io_kbuf_recycle(req, issue_flags); 946 947 if (!io_recv_finish(req, &ret, &msg, ret <= 0, issue_flags)) 948 goto retry_multishot; 949 950 return ret; 951 } 952 953 void io_send_zc_cleanup(struct io_kiocb *req) 954 { 955 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 956 struct io_async_msghdr *io; 957 958 if (req_has_async_data(req)) { 959 io = req->async_data; 960 /* might be ->fast_iov if *msg_copy_hdr failed */ 961 if (io->free_iov != io->fast_iov) 962 kfree(io->free_iov); 963 } 964 if (zc->notif) { 965 io_notif_flush(zc->notif); 966 zc->notif = NULL; 967 } 968 } 969 970 #define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF) 971 #define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE) 972 973 int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 974 { 975 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 976 struct io_ring_ctx *ctx = req->ctx; 977 struct io_kiocb *notif; 978 979 if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3))) 980 return -EINVAL; 981 /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */ 982 if (req->flags & REQ_F_CQE_SKIP) 983 return -EINVAL; 984 985 notif = zc->notif = io_alloc_notif(ctx); 986 if (!notif) 987 return -ENOMEM; 988 notif->cqe.user_data = req->cqe.user_data; 989 notif->cqe.res = 0; 990 notif->cqe.flags = IORING_CQE_F_NOTIF; 991 req->flags |= REQ_F_NEED_CLEANUP; 992 993 zc->flags = READ_ONCE(sqe->ioprio); 994 if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) { 995 if (zc->flags & ~IO_ZC_FLAGS_VALID) 996 return -EINVAL; 997 if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) { 998 io_notif_set_extended(notif); 999 io_notif_to_data(notif)->zc_report = true; 1000 } 1001 } 1002 1003 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 1004 unsigned idx = READ_ONCE(sqe->buf_index); 1005 1006 if (unlikely(idx >= ctx->nr_user_bufs)) 1007 return -EFAULT; 1008 idx = array_index_nospec(idx, ctx->nr_user_bufs); 1009 req->imu = READ_ONCE(ctx->user_bufs[idx]); 1010 io_req_set_rsrc_node(notif, ctx, 0); 1011 } 1012 1013 if (req->opcode == IORING_OP_SEND_ZC) { 1014 if (READ_ONCE(sqe->__pad3[0])) 1015 return -EINVAL; 1016 zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 1017 zc->addr_len = READ_ONCE(sqe->addr_len); 1018 } else { 1019 if (unlikely(sqe->addr2 || sqe->file_index)) 1020 return -EINVAL; 1021 if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF)) 1022 return -EINVAL; 1023 } 1024 1025 zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1026 zc->len = READ_ONCE(sqe->len); 1027 zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; 1028 if (zc->msg_flags & MSG_DONTWAIT) 1029 req->flags |= REQ_F_NOWAIT; 1030 1031 zc->done_io = 0; 1032 1033 #ifdef CONFIG_COMPAT 1034 if (req->ctx->compat) 1035 zc->msg_flags |= MSG_CMSG_COMPAT; 1036 #endif 1037 return 0; 1038 } 1039 1040 static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb, 1041 struct iov_iter *from, size_t length) 1042 { 1043 skb_zcopy_downgrade_managed(skb); 1044 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 1045 } 1046 1047 static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, 1048 struct iov_iter *from, size_t length) 1049 { 1050 struct skb_shared_info *shinfo = skb_shinfo(skb); 1051 int frag = shinfo->nr_frags; 1052 int ret = 0; 1053 struct bvec_iter bi; 1054 ssize_t copied = 0; 1055 unsigned long truesize = 0; 1056 1057 if (!frag) 1058 shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; 1059 else if (unlikely(!skb_zcopy_managed(skb))) 1060 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); 1061 1062 bi.bi_size = min(from->count, length); 1063 bi.bi_bvec_done = from->iov_offset; 1064 bi.bi_idx = 0; 1065 1066 while (bi.bi_size && frag < MAX_SKB_FRAGS) { 1067 struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); 1068 1069 copied += v.bv_len; 1070 truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); 1071 __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, 1072 v.bv_offset, v.bv_len); 1073 bvec_iter_advance_single(from->bvec, &bi, v.bv_len); 1074 } 1075 if (bi.bi_size) 1076 ret = -EMSGSIZE; 1077 1078 shinfo->nr_frags = frag; 1079 from->bvec += bi.bi_idx; 1080 from->nr_segs -= bi.bi_idx; 1081 from->count -= copied; 1082 from->iov_offset = bi.bi_bvec_done; 1083 1084 skb->data_len += copied; 1085 skb->len += copied; 1086 skb->truesize += truesize; 1087 1088 if (sk && sk->sk_type == SOCK_STREAM) { 1089 sk_wmem_queued_add(sk, truesize); 1090 if (!skb_zcopy_pure(skb)) 1091 sk_mem_charge(sk, truesize); 1092 } else { 1093 refcount_add(truesize, &skb->sk->sk_wmem_alloc); 1094 } 1095 return ret; 1096 } 1097 1098 int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) 1099 { 1100 struct sockaddr_storage __address; 1101 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); 1102 struct msghdr msg; 1103 struct socket *sock; 1104 unsigned msg_flags; 1105 int ret, min_ret = 0; 1106 1107 sock = sock_from_file(req->file); 1108 if (unlikely(!sock)) 1109 return -ENOTSOCK; 1110 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 1111 return -EOPNOTSUPP; 1112 1113 msg.msg_name = NULL; 1114 msg.msg_control = NULL; 1115 msg.msg_controllen = 0; 1116 msg.msg_namelen = 0; 1117 1118 if (zc->addr) { 1119 if (req_has_async_data(req)) { 1120 struct io_async_msghdr *io = req->async_data; 1121 1122 msg.msg_name = &io->addr; 1123 } else { 1124 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); 1125 if (unlikely(ret < 0)) 1126 return ret; 1127 msg.msg_name = (struct sockaddr *)&__address; 1128 } 1129 msg.msg_namelen = zc->addr_len; 1130 } 1131 1132 if (!(req->flags & REQ_F_POLLED) && 1133 (zc->flags & IORING_RECVSEND_POLL_FIRST)) 1134 return io_setup_async_addr(req, &__address, issue_flags); 1135 1136 if (zc->flags & IORING_RECVSEND_FIXED_BUF) { 1137 ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu, 1138 (u64)(uintptr_t)zc->buf, zc->len); 1139 if (unlikely(ret)) 1140 return ret; 1141 msg.sg_from_iter = io_sg_from_iter; 1142 } else { 1143 io_notif_set_extended(zc->notif); 1144 ret = import_ubuf(ITER_SOURCE, zc->buf, zc->len, &msg.msg_iter); 1145 if (unlikely(ret)) 1146 return ret; 1147 ret = io_notif_account_mem(zc->notif, zc->len); 1148 if (unlikely(ret)) 1149 return ret; 1150 msg.sg_from_iter = io_sg_from_iter_iovec; 1151 } 1152 1153 msg_flags = zc->msg_flags | MSG_ZEROCOPY; 1154 if (issue_flags & IO_URING_F_NONBLOCK) 1155 msg_flags |= MSG_DONTWAIT; 1156 if (msg_flags & MSG_WAITALL) 1157 min_ret = iov_iter_count(&msg.msg_iter); 1158 msg_flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; 1159 1160 msg.msg_flags = msg_flags; 1161 msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; 1162 ret = sock_sendmsg(sock, &msg); 1163 1164 if (unlikely(ret < min_ret)) { 1165 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1166 return io_setup_async_addr(req, &__address, issue_flags); 1167 1168 if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { 1169 zc->len -= ret; 1170 zc->buf += ret; 1171 zc->done_io += ret; 1172 req->flags |= REQ_F_PARTIAL_IO; 1173 return io_setup_async_addr(req, &__address, issue_flags); 1174 } 1175 if (ret == -ERESTARTSYS) 1176 ret = -EINTR; 1177 req_set_fail(req); 1178 } 1179 1180 if (ret >= 0) 1181 ret += zc->done_io; 1182 else if (zc->done_io) 1183 ret = zc->done_io; 1184 1185 /* 1186 * If we're in io-wq we can't rely on tw ordering guarantees, defer 1187 * flushing notif to io_send_zc_cleanup() 1188 */ 1189 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 1190 io_notif_flush(zc->notif); 1191 req->flags &= ~REQ_F_NEED_CLEANUP; 1192 } 1193 io_req_set_res(req, ret, IORING_CQE_F_MORE); 1194 return IOU_OK; 1195 } 1196 1197 int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags) 1198 { 1199 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 1200 struct io_async_msghdr iomsg, *kmsg; 1201 struct socket *sock; 1202 unsigned flags; 1203 int ret, min_ret = 0; 1204 1205 io_notif_set_extended(sr->notif); 1206 1207 sock = sock_from_file(req->file); 1208 if (unlikely(!sock)) 1209 return -ENOTSOCK; 1210 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) 1211 return -EOPNOTSUPP; 1212 1213 if (req_has_async_data(req)) { 1214 kmsg = req->async_data; 1215 } else { 1216 ret = io_sendmsg_copy_hdr(req, &iomsg); 1217 if (ret) 1218 return ret; 1219 kmsg = &iomsg; 1220 } 1221 1222 if (!(req->flags & REQ_F_POLLED) && 1223 (sr->flags & IORING_RECVSEND_POLL_FIRST)) 1224 return io_setup_async_msg(req, kmsg, issue_flags); 1225 1226 flags = sr->msg_flags | MSG_ZEROCOPY; 1227 if (issue_flags & IO_URING_F_NONBLOCK) 1228 flags |= MSG_DONTWAIT; 1229 if (flags & MSG_WAITALL) 1230 min_ret = iov_iter_count(&kmsg->msg.msg_iter); 1231 1232 kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg; 1233 kmsg->msg.sg_from_iter = io_sg_from_iter_iovec; 1234 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); 1235 1236 if (unlikely(ret < min_ret)) { 1237 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1238 return io_setup_async_msg(req, kmsg, issue_flags); 1239 1240 if (ret > 0 && io_net_retry(sock, flags)) { 1241 sr->done_io += ret; 1242 req->flags |= REQ_F_PARTIAL_IO; 1243 return io_setup_async_msg(req, kmsg, issue_flags); 1244 } 1245 if (ret == -ERESTARTSYS) 1246 ret = -EINTR; 1247 req_set_fail(req); 1248 } 1249 /* fast path, check for non-NULL to avoid function call */ 1250 if (kmsg->free_iov) { 1251 kfree(kmsg->free_iov); 1252 kmsg->free_iov = NULL; 1253 } 1254 1255 io_netmsg_recycle(req, issue_flags); 1256 if (ret >= 0) 1257 ret += sr->done_io; 1258 else if (sr->done_io) 1259 ret = sr->done_io; 1260 1261 /* 1262 * If we're in io-wq we can't rely on tw ordering guarantees, defer 1263 * flushing notif to io_send_zc_cleanup() 1264 */ 1265 if (!(issue_flags & IO_URING_F_UNLOCKED)) { 1266 io_notif_flush(sr->notif); 1267 req->flags &= ~REQ_F_NEED_CLEANUP; 1268 } 1269 io_req_set_res(req, ret, IORING_CQE_F_MORE); 1270 return IOU_OK; 1271 } 1272 1273 void io_sendrecv_fail(struct io_kiocb *req) 1274 { 1275 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); 1276 1277 if (req->flags & REQ_F_PARTIAL_IO) 1278 req->cqe.res = sr->done_io; 1279 1280 if ((req->flags & REQ_F_NEED_CLEANUP) && 1281 (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) 1282 req->cqe.flags |= IORING_CQE_F_MORE; 1283 } 1284 1285 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1286 { 1287 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1288 unsigned flags; 1289 1290 if (sqe->len || sqe->buf_index) 1291 return -EINVAL; 1292 1293 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1294 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); 1295 accept->flags = READ_ONCE(sqe->accept_flags); 1296 accept->nofile = rlimit(RLIMIT_NOFILE); 1297 flags = READ_ONCE(sqe->ioprio); 1298 if (flags & ~IORING_ACCEPT_MULTISHOT) 1299 return -EINVAL; 1300 1301 accept->file_slot = READ_ONCE(sqe->file_index); 1302 if (accept->file_slot) { 1303 if (accept->flags & SOCK_CLOEXEC) 1304 return -EINVAL; 1305 if (flags & IORING_ACCEPT_MULTISHOT && 1306 accept->file_slot != IORING_FILE_INDEX_ALLOC) 1307 return -EINVAL; 1308 } 1309 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1310 return -EINVAL; 1311 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) 1312 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; 1313 if (flags & IORING_ACCEPT_MULTISHOT) 1314 req->flags |= REQ_F_APOLL_MULTISHOT; 1315 return 0; 1316 } 1317 1318 int io_accept(struct io_kiocb *req, unsigned int issue_flags) 1319 { 1320 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); 1321 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1322 unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; 1323 bool fixed = !!accept->file_slot; 1324 struct file *file; 1325 int ret, fd; 1326 1327 if (!io_check_multishot(req, issue_flags)) 1328 return -EAGAIN; 1329 retry: 1330 if (!fixed) { 1331 fd = __get_unused_fd_flags(accept->flags, accept->nofile); 1332 if (unlikely(fd < 0)) 1333 return fd; 1334 } 1335 file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, 1336 accept->flags); 1337 if (IS_ERR(file)) { 1338 if (!fixed) 1339 put_unused_fd(fd); 1340 ret = PTR_ERR(file); 1341 if (ret == -EAGAIN && force_nonblock) { 1342 /* 1343 * if it's multishot and polled, we don't need to 1344 * return EAGAIN to arm the poll infra since it 1345 * has already been done 1346 */ 1347 if (issue_flags & IO_URING_F_MULTISHOT) 1348 ret = IOU_ISSUE_SKIP_COMPLETE; 1349 return ret; 1350 } 1351 if (ret == -ERESTARTSYS) 1352 ret = -EINTR; 1353 req_set_fail(req); 1354 } else if (!fixed) { 1355 fd_install(fd, file); 1356 ret = fd; 1357 } else { 1358 ret = io_fixed_fd_install(req, issue_flags, file, 1359 accept->file_slot); 1360 } 1361 1362 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { 1363 io_req_set_res(req, ret, 0); 1364 return IOU_OK; 1365 } 1366 1367 if (ret < 0) 1368 return ret; 1369 if (io_aux_cqe(req, issue_flags & IO_URING_F_COMPLETE_DEFER, ret, 1370 IORING_CQE_F_MORE, true)) 1371 goto retry; 1372 1373 return -ECANCELED; 1374 } 1375 1376 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1377 { 1378 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1379 1380 if (sqe->addr || sqe->rw_flags || sqe->buf_index) 1381 return -EINVAL; 1382 1383 sock->domain = READ_ONCE(sqe->fd); 1384 sock->type = READ_ONCE(sqe->off); 1385 sock->protocol = READ_ONCE(sqe->len); 1386 sock->file_slot = READ_ONCE(sqe->file_index); 1387 sock->nofile = rlimit(RLIMIT_NOFILE); 1388 1389 sock->flags = sock->type & ~SOCK_TYPE_MASK; 1390 if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) 1391 return -EINVAL; 1392 if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) 1393 return -EINVAL; 1394 return 0; 1395 } 1396 1397 int io_socket(struct io_kiocb *req, unsigned int issue_flags) 1398 { 1399 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); 1400 bool fixed = !!sock->file_slot; 1401 struct file *file; 1402 int ret, fd; 1403 1404 if (!fixed) { 1405 fd = __get_unused_fd_flags(sock->flags, sock->nofile); 1406 if (unlikely(fd < 0)) 1407 return fd; 1408 } 1409 file = __sys_socket_file(sock->domain, sock->type, sock->protocol); 1410 if (IS_ERR(file)) { 1411 if (!fixed) 1412 put_unused_fd(fd); 1413 ret = PTR_ERR(file); 1414 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) 1415 return -EAGAIN; 1416 if (ret == -ERESTARTSYS) 1417 ret = -EINTR; 1418 req_set_fail(req); 1419 } else if (!fixed) { 1420 fd_install(fd, file); 1421 ret = fd; 1422 } else { 1423 ret = io_fixed_fd_install(req, issue_flags, file, 1424 sock->file_slot); 1425 } 1426 io_req_set_res(req, ret, 0); 1427 return IOU_OK; 1428 } 1429 1430 int io_connect_prep_async(struct io_kiocb *req) 1431 { 1432 struct io_async_connect *io = req->async_data; 1433 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1434 1435 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); 1436 } 1437 1438 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) 1439 { 1440 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); 1441 1442 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) 1443 return -EINVAL; 1444 1445 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); 1446 conn->addr_len = READ_ONCE(sqe->addr2); 1447 conn->in_progress = conn->seen_econnaborted = false; 1448 return 0; 1449 } 1450 1451 int io_connect(struct io_kiocb *req, unsigned int issue_flags) 1452 { 1453 struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); 1454 struct io_async_connect __io, *io; 1455 unsigned file_flags; 1456 int ret; 1457 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; 1458 1459 if (connect->in_progress) { 1460 struct socket *socket; 1461 1462 ret = -ENOTSOCK; 1463 socket = sock_from_file(req->file); 1464 if (socket) 1465 ret = sock_error(socket->sk); 1466 goto out; 1467 } 1468 1469 if (req_has_async_data(req)) { 1470 io = req->async_data; 1471 } else { 1472 ret = move_addr_to_kernel(connect->addr, 1473 connect->addr_len, 1474 &__io.address); 1475 if (ret) 1476 goto out; 1477 io = &__io; 1478 } 1479 1480 file_flags = force_nonblock ? O_NONBLOCK : 0; 1481 1482 ret = __sys_connect_file(req->file, &io->address, 1483 connect->addr_len, file_flags); 1484 if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED) 1485 && force_nonblock) { 1486 if (ret == -EINPROGRESS) { 1487 connect->in_progress = true; 1488 return -EAGAIN; 1489 } 1490 if (ret == -ECONNABORTED) { 1491 if (connect->seen_econnaborted) 1492 goto out; 1493 connect->seen_econnaborted = true; 1494 } 1495 if (req_has_async_data(req)) 1496 return -EAGAIN; 1497 if (io_alloc_async_data(req)) { 1498 ret = -ENOMEM; 1499 goto out; 1500 } 1501 memcpy(req->async_data, &__io, sizeof(__io)); 1502 return -EAGAIN; 1503 } 1504 if (ret == -ERESTARTSYS) 1505 ret = -EINTR; 1506 out: 1507 if (ret < 0) 1508 req_set_fail(req); 1509 io_req_set_res(req, ret, 0); 1510 return IOU_OK; 1511 } 1512 1513 void io_netmsg_cache_free(struct io_cache_entry *entry) 1514 { 1515 kfree(container_of(entry, struct io_async_msghdr, cache)); 1516 } 1517 #endif 1518