| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/errno.h> |
| 4 | #include <linux/file.h> |
| 5 | #include <linux/slab.h> |
| 6 | #include <linux/net.h> |
| 7 | #include <linux/compat.h> |
| 8 | #include <net/compat.h> |
| 9 | #include <linux/io_uring.h> |
| 10 | |
| 11 | #include <uapi/linux/io_uring.h> |
| 12 | |
| 13 | #include "io_uring.h" |
| 14 | #include "kbuf.h" |
| 15 | #include "alloc_cache.h" |
| 16 | #include "net.h" |
| 17 | #include "notif.h" |
| 18 | #include "rsrc.h" |
| 19 | |
| 20 | #if defined(CONFIG_NET) |
| 21 | struct io_shutdown { |
| 22 | struct file *file; |
| 23 | int how; |
| 24 | }; |
| 25 | |
| 26 | struct io_accept { |
| 27 | struct file *file; |
| 28 | struct sockaddr __user *addr; |
| 29 | int __user *addr_len; |
| 30 | int flags; |
| 31 | u32 file_slot; |
| 32 | unsigned long nofile; |
| 33 | }; |
| 34 | |
| 35 | struct io_socket { |
| 36 | struct file *file; |
| 37 | int domain; |
| 38 | int type; |
| 39 | int protocol; |
| 40 | int flags; |
| 41 | u32 file_slot; |
| 42 | unsigned long nofile; |
| 43 | }; |
| 44 | |
| 45 | struct io_connect { |
| 46 | struct file *file; |
| 47 | struct sockaddr __user *addr; |
| 48 | int addr_len; |
| 49 | bool in_progress; |
| 50 | bool seen_econnaborted; |
| 51 | }; |
| 52 | |
| 53 | struct io_sr_msg { |
| 54 | struct file *file; |
| 55 | union { |
| 56 | struct compat_msghdr __user *umsg_compat; |
| 57 | struct user_msghdr __user *umsg; |
| 58 | void __user *buf; |
| 59 | }; |
| 60 | unsigned len; |
| 61 | unsigned done_io; |
| 62 | unsigned msg_flags; |
| 63 | u16 flags; |
| 64 | /* initialised and used only by !msg send variants */ |
| 65 | u16 addr_len; |
| 66 | u16 buf_group; |
| 67 | void __user *addr; |
| 68 | /* used only for send zerocopy */ |
| 69 | struct io_kiocb *notif; |
| 70 | }; |
| 71 | |
| 72 | static inline bool io_check_multishot(struct io_kiocb *req, |
| 73 | unsigned int issue_flags) |
| 74 | { |
| 75 | /* |
| 76 | * When ->locked_cq is set we only allow to post CQEs from the original |
| 77 | * task context. Usual request completions will be handled in other |
| 78 | * generic paths but multipoll may decide to post extra cqes. |
| 79 | */ |
| 80 | return !(issue_flags & IO_URING_F_IOWQ) || |
| 81 | !(issue_flags & IO_URING_F_MULTISHOT) || |
| 82 | !req->ctx->task_complete; |
| 83 | } |
| 84 | |
| 85 | int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 86 | { |
| 87 | struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); |
| 88 | |
| 89 | if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || |
| 90 | sqe->buf_index || sqe->splice_fd_in)) |
| 91 | return -EINVAL; |
| 92 | |
| 93 | shutdown->how = READ_ONCE(sqe->len); |
| 94 | req->flags |= REQ_F_FORCE_ASYNC; |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) |
| 99 | { |
| 100 | struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); |
| 101 | struct socket *sock; |
| 102 | int ret; |
| 103 | |
| 104 | WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); |
| 105 | |
| 106 | sock = sock_from_file(req->file); |
| 107 | if (unlikely(!sock)) |
| 108 | return -ENOTSOCK; |
| 109 | |
| 110 | ret = __sys_shutdown_sock(sock, shutdown->how); |
| 111 | io_req_set_res(req, ret, 0); |
| 112 | return IOU_OK; |
| 113 | } |
| 114 | |
| 115 | static bool io_net_retry(struct socket *sock, int flags) |
| 116 | { |
| 117 | if (!(flags & MSG_WAITALL)) |
| 118 | return false; |
| 119 | return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; |
| 120 | } |
| 121 | |
| 122 | static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) |
| 123 | { |
| 124 | struct io_async_msghdr *hdr = req->async_data; |
| 125 | |
| 126 | if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) |
| 127 | return; |
| 128 | |
| 129 | /* Let normal cleanup path reap it if we fail adding to the cache */ |
| 130 | if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { |
| 131 | req->async_data = NULL; |
| 132 | req->flags &= ~REQ_F_ASYNC_DATA; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req, |
| 137 | unsigned int issue_flags) |
| 138 | { |
| 139 | struct io_ring_ctx *ctx = req->ctx; |
| 140 | struct io_cache_entry *entry; |
| 141 | struct io_async_msghdr *hdr; |
| 142 | |
| 143 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { |
| 144 | entry = io_alloc_cache_get(&ctx->netmsg_cache); |
| 145 | if (entry) { |
| 146 | hdr = container_of(entry, struct io_async_msghdr, cache); |
| 147 | hdr->free_iov = NULL; |
| 148 | req->flags |= REQ_F_ASYNC_DATA; |
| 149 | req->async_data = hdr; |
| 150 | return hdr; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | if (!io_alloc_async_data(req)) { |
| 155 | hdr = req->async_data; |
| 156 | hdr->free_iov = NULL; |
| 157 | return hdr; |
| 158 | } |
| 159 | return NULL; |
| 160 | } |
| 161 | |
| 162 | static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req) |
| 163 | { |
| 164 | /* ->prep_async is always called from the submission context */ |
| 165 | return io_msg_alloc_async(req, 0); |
| 166 | } |
| 167 | |
| 168 | static int io_setup_async_msg(struct io_kiocb *req, |
| 169 | struct io_async_msghdr *kmsg, |
| 170 | unsigned int issue_flags) |
| 171 | { |
| 172 | struct io_async_msghdr *async_msg; |
| 173 | |
| 174 | if (req_has_async_data(req)) |
| 175 | return -EAGAIN; |
| 176 | async_msg = io_msg_alloc_async(req, issue_flags); |
| 177 | if (!async_msg) { |
| 178 | kfree(kmsg->free_iov); |
| 179 | return -ENOMEM; |
| 180 | } |
| 181 | req->flags |= REQ_F_NEED_CLEANUP; |
| 182 | memcpy(async_msg, kmsg, sizeof(*kmsg)); |
| 183 | if (async_msg->msg.msg_name) |
| 184 | async_msg->msg.msg_name = &async_msg->addr; |
| 185 | /* if were using fast_iov, set it to the new one */ |
| 186 | if (iter_is_iovec(&kmsg->msg.msg_iter) && !kmsg->free_iov) { |
| 187 | size_t fast_idx = iter_iov(&kmsg->msg.msg_iter) - kmsg->fast_iov; |
| 188 | async_msg->msg.msg_iter.__iov = &async_msg->fast_iov[fast_idx]; |
| 189 | } |
| 190 | |
| 191 | return -EAGAIN; |
| 192 | } |
| 193 | |
| 194 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, |
| 195 | struct io_async_msghdr *iomsg) |
| 196 | { |
| 197 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 198 | |
| 199 | iomsg->msg.msg_name = &iomsg->addr; |
| 200 | iomsg->free_iov = iomsg->fast_iov; |
| 201 | return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, |
| 202 | &iomsg->free_iov); |
| 203 | } |
| 204 | |
| 205 | int io_send_prep_async(struct io_kiocb *req) |
| 206 | { |
| 207 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 208 | struct io_async_msghdr *io; |
| 209 | int ret; |
| 210 | |
| 211 | if (!zc->addr || req_has_async_data(req)) |
| 212 | return 0; |
| 213 | io = io_msg_alloc_async_prep(req); |
| 214 | if (!io) |
| 215 | return -ENOMEM; |
| 216 | ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | static int io_setup_async_addr(struct io_kiocb *req, |
| 221 | struct sockaddr_storage *addr_storage, |
| 222 | unsigned int issue_flags) |
| 223 | { |
| 224 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 225 | struct io_async_msghdr *io; |
| 226 | |
| 227 | if (!sr->addr || req_has_async_data(req)) |
| 228 | return -EAGAIN; |
| 229 | io = io_msg_alloc_async(req, issue_flags); |
| 230 | if (!io) |
| 231 | return -ENOMEM; |
| 232 | memcpy(&io->addr, addr_storage, sizeof(io->addr)); |
| 233 | return -EAGAIN; |
| 234 | } |
| 235 | |
| 236 | int io_sendmsg_prep_async(struct io_kiocb *req) |
| 237 | { |
| 238 | int ret; |
| 239 | |
| 240 | if (!io_msg_alloc_async_prep(req)) |
| 241 | return -ENOMEM; |
| 242 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
| 243 | if (!ret) |
| 244 | req->flags |= REQ_F_NEED_CLEANUP; |
| 245 | return ret; |
| 246 | } |
| 247 | |
| 248 | void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) |
| 249 | { |
| 250 | struct io_async_msghdr *io = req->async_data; |
| 251 | |
| 252 | kfree(io->free_iov); |
| 253 | } |
| 254 | |
| 255 | int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 256 | { |
| 257 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 258 | |
| 259 | if (req->opcode == IORING_OP_SEND) { |
| 260 | if (READ_ONCE(sqe->__pad3[0])) |
| 261 | return -EINVAL; |
| 262 | sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 263 | sr->addr_len = READ_ONCE(sqe->addr_len); |
| 264 | } else if (sqe->addr2 || sqe->file_index) { |
| 265 | return -EINVAL; |
| 266 | } |
| 267 | |
| 268 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 269 | sr->len = READ_ONCE(sqe->len); |
| 270 | sr->flags = READ_ONCE(sqe->ioprio); |
| 271 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) |
| 272 | return -EINVAL; |
| 273 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
| 274 | if (sr->msg_flags & MSG_DONTWAIT) |
| 275 | req->flags |= REQ_F_NOWAIT; |
| 276 | |
| 277 | #ifdef CONFIG_COMPAT |
| 278 | if (req->ctx->compat) |
| 279 | sr->msg_flags |= MSG_CMSG_COMPAT; |
| 280 | #endif |
| 281 | sr->done_io = 0; |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
| 286 | { |
| 287 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 288 | struct io_async_msghdr iomsg, *kmsg; |
| 289 | struct socket *sock; |
| 290 | unsigned flags; |
| 291 | int min_ret = 0; |
| 292 | int ret; |
| 293 | |
| 294 | sock = sock_from_file(req->file); |
| 295 | if (unlikely(!sock)) |
| 296 | return -ENOTSOCK; |
| 297 | |
| 298 | if (req_has_async_data(req)) { |
| 299 | kmsg = req->async_data; |
| 300 | } else { |
| 301 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
| 302 | if (ret) |
| 303 | return ret; |
| 304 | kmsg = &iomsg; |
| 305 | } |
| 306 | |
| 307 | if (!(req->flags & REQ_F_POLLED) && |
| 308 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) |
| 309 | return io_setup_async_msg(req, kmsg, issue_flags); |
| 310 | |
| 311 | flags = sr->msg_flags; |
| 312 | if (issue_flags & IO_URING_F_NONBLOCK) |
| 313 | flags |= MSG_DONTWAIT; |
| 314 | if (flags & MSG_WAITALL) |
| 315 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); |
| 316 | |
| 317 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
| 318 | |
| 319 | if (ret < min_ret) { |
| 320 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) |
| 321 | return io_setup_async_msg(req, kmsg, issue_flags); |
| 322 | if (ret > 0 && io_net_retry(sock, flags)) { |
| 323 | sr->done_io += ret; |
| 324 | req->flags |= REQ_F_PARTIAL_IO; |
| 325 | return io_setup_async_msg(req, kmsg, issue_flags); |
| 326 | } |
| 327 | if (ret == -ERESTARTSYS) |
| 328 | ret = -EINTR; |
| 329 | req_set_fail(req); |
| 330 | } |
| 331 | /* fast path, check for non-NULL to avoid function call */ |
| 332 | if (kmsg->free_iov) |
| 333 | kfree(kmsg->free_iov); |
| 334 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 335 | io_netmsg_recycle(req, issue_flags); |
| 336 | if (ret >= 0) |
| 337 | ret += sr->done_io; |
| 338 | else if (sr->done_io) |
| 339 | ret = sr->done_io; |
| 340 | io_req_set_res(req, ret, 0); |
| 341 | return IOU_OK; |
| 342 | } |
| 343 | |
| 344 | int io_send(struct io_kiocb *req, unsigned int issue_flags) |
| 345 | { |
| 346 | struct sockaddr_storage __address; |
| 347 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 348 | struct msghdr msg; |
| 349 | struct socket *sock; |
| 350 | unsigned flags; |
| 351 | int min_ret = 0; |
| 352 | int ret; |
| 353 | |
| 354 | msg.msg_name = NULL; |
| 355 | msg.msg_control = NULL; |
| 356 | msg.msg_controllen = 0; |
| 357 | msg.msg_namelen = 0; |
| 358 | msg.msg_ubuf = NULL; |
| 359 | |
| 360 | if (sr->addr) { |
| 361 | if (req_has_async_data(req)) { |
| 362 | struct io_async_msghdr *io = req->async_data; |
| 363 | |
| 364 | msg.msg_name = &io->addr; |
| 365 | } else { |
| 366 | ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address); |
| 367 | if (unlikely(ret < 0)) |
| 368 | return ret; |
| 369 | msg.msg_name = (struct sockaddr *)&__address; |
| 370 | } |
| 371 | msg.msg_namelen = sr->addr_len; |
| 372 | } |
| 373 | |
| 374 | if (!(req->flags & REQ_F_POLLED) && |
| 375 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) |
| 376 | return io_setup_async_addr(req, &__address, issue_flags); |
| 377 | |
| 378 | sock = sock_from_file(req->file); |
| 379 | if (unlikely(!sock)) |
| 380 | return -ENOTSOCK; |
| 381 | |
| 382 | ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter); |
| 383 | if (unlikely(ret)) |
| 384 | return ret; |
| 385 | |
| 386 | flags = sr->msg_flags; |
| 387 | if (issue_flags & IO_URING_F_NONBLOCK) |
| 388 | flags |= MSG_DONTWAIT; |
| 389 | if (flags & MSG_WAITALL) |
| 390 | min_ret = iov_iter_count(&msg.msg_iter); |
| 391 | |
| 392 | 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); |
| 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 | iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len); |
| 779 | } |
| 780 | |
| 781 | flags = sr->msg_flags; |
| 782 | if (force_nonblock) |
| 783 | flags |= MSG_DONTWAIT; |
| 784 | if (flags & MSG_WAITALL) |
| 785 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); |
| 786 | |
| 787 | kmsg->msg.msg_get_inq = 1; |
| 788 | if (req->flags & REQ_F_APOLL_MULTISHOT) |
| 789 | ret = io_recvmsg_multishot(sock, sr, kmsg, flags, |
| 790 | &mshot_finished); |
| 791 | else |
| 792 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, |
| 793 | kmsg->uaddr, flags); |
| 794 | |
| 795 | if (ret < min_ret) { |
| 796 | if (ret == -EAGAIN && force_nonblock) { |
| 797 | ret = io_setup_async_msg(req, kmsg, issue_flags); |
| 798 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) { |
| 799 | io_kbuf_recycle(req, issue_flags); |
| 800 | return IOU_ISSUE_SKIP_COMPLETE; |
| 801 | } |
| 802 | return ret; |
| 803 | } |
| 804 | if (ret > 0 && io_net_retry(sock, flags)) { |
| 805 | sr->done_io += ret; |
| 806 | req->flags |= REQ_F_PARTIAL_IO; |
| 807 | return io_setup_async_msg(req, kmsg, issue_flags); |
| 808 | } |
| 809 | if (ret == -ERESTARTSYS) |
| 810 | ret = -EINTR; |
| 811 | req_set_fail(req); |
| 812 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { |
| 813 | req_set_fail(req); |
| 814 | } |
| 815 | |
| 816 | if (ret > 0) |
| 817 | ret += sr->done_io; |
| 818 | else if (sr->done_io) |
| 819 | ret = sr->done_io; |
| 820 | else |
| 821 | io_kbuf_recycle(req, issue_flags); |
| 822 | |
| 823 | cflags = io_put_kbuf(req, issue_flags); |
| 824 | if (kmsg->msg.msg_inq) |
| 825 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; |
| 826 | |
| 827 | if (!io_recv_finish(req, &ret, cflags, mshot_finished, issue_flags)) |
| 828 | goto retry_multishot; |
| 829 | |
| 830 | if (mshot_finished) { |
| 831 | /* fast path, check for non-NULL to avoid function call */ |
| 832 | if (kmsg->free_iov) |
| 833 | kfree(kmsg->free_iov); |
| 834 | io_netmsg_recycle(req, issue_flags); |
| 835 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 836 | } |
| 837 | |
| 838 | return ret; |
| 839 | } |
| 840 | |
| 841 | int io_recv(struct io_kiocb *req, unsigned int issue_flags) |
| 842 | { |
| 843 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 844 | struct msghdr msg; |
| 845 | struct socket *sock; |
| 846 | unsigned int cflags; |
| 847 | unsigned flags; |
| 848 | int ret, min_ret = 0; |
| 849 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
| 850 | size_t len = sr->len; |
| 851 | |
| 852 | if (!(req->flags & REQ_F_POLLED) && |
| 853 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) |
| 854 | return -EAGAIN; |
| 855 | |
| 856 | if (!io_check_multishot(req, issue_flags)) |
| 857 | return -EAGAIN; |
| 858 | |
| 859 | sock = sock_from_file(req->file); |
| 860 | if (unlikely(!sock)) |
| 861 | return -ENOTSOCK; |
| 862 | |
| 863 | retry_multishot: |
| 864 | if (io_do_buffer_select(req)) { |
| 865 | void __user *buf; |
| 866 | |
| 867 | buf = io_buffer_select(req, &len, issue_flags); |
| 868 | if (!buf) |
| 869 | return -ENOBUFS; |
| 870 | sr->buf = buf; |
| 871 | } |
| 872 | |
| 873 | ret = import_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter); |
| 874 | if (unlikely(ret)) |
| 875 | goto out_free; |
| 876 | |
| 877 | msg.msg_name = NULL; |
| 878 | msg.msg_namelen = 0; |
| 879 | msg.msg_control = NULL; |
| 880 | msg.msg_get_inq = 1; |
| 881 | msg.msg_flags = 0; |
| 882 | msg.msg_controllen = 0; |
| 883 | msg.msg_iocb = NULL; |
| 884 | msg.msg_ubuf = NULL; |
| 885 | |
| 886 | flags = sr->msg_flags; |
| 887 | if (force_nonblock) |
| 888 | flags |= MSG_DONTWAIT; |
| 889 | if (flags & MSG_WAITALL) |
| 890 | min_ret = iov_iter_count(&msg.msg_iter); |
| 891 | |
| 892 | ret = sock_recvmsg(sock, &msg, flags); |
| 893 | if (ret < min_ret) { |
| 894 | if (ret == -EAGAIN && force_nonblock) { |
| 895 | if (issue_flags & IO_URING_F_MULTISHOT) { |
| 896 | io_kbuf_recycle(req, issue_flags); |
| 897 | return IOU_ISSUE_SKIP_COMPLETE; |
| 898 | } |
| 899 | |
| 900 | return -EAGAIN; |
| 901 | } |
| 902 | if (ret > 0 && io_net_retry(sock, flags)) { |
| 903 | sr->len -= ret; |
| 904 | sr->buf += ret; |
| 905 | sr->done_io += ret; |
| 906 | req->flags |= REQ_F_PARTIAL_IO; |
| 907 | return -EAGAIN; |
| 908 | } |
| 909 | if (ret == -ERESTARTSYS) |
| 910 | ret = -EINTR; |
| 911 | req_set_fail(req); |
| 912 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { |
| 913 | out_free: |
| 914 | req_set_fail(req); |
| 915 | } |
| 916 | |
| 917 | if (ret > 0) |
| 918 | ret += sr->done_io; |
| 919 | else if (sr->done_io) |
| 920 | ret = sr->done_io; |
| 921 | else |
| 922 | io_kbuf_recycle(req, issue_flags); |
| 923 | |
| 924 | cflags = io_put_kbuf(req, issue_flags); |
| 925 | if (msg.msg_inq) |
| 926 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; |
| 927 | |
| 928 | if (!io_recv_finish(req, &ret, cflags, ret <= 0, issue_flags)) |
| 929 | goto retry_multishot; |
| 930 | |
| 931 | return ret; |
| 932 | } |
| 933 | |
| 934 | void io_send_zc_cleanup(struct io_kiocb *req) |
| 935 | { |
| 936 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 937 | struct io_async_msghdr *io; |
| 938 | |
| 939 | if (req_has_async_data(req)) { |
| 940 | io = req->async_data; |
| 941 | /* might be ->fast_iov if *msg_copy_hdr failed */ |
| 942 | if (io->free_iov != io->fast_iov) |
| 943 | kfree(io->free_iov); |
| 944 | } |
| 945 | if (zc->notif) { |
| 946 | io_notif_flush(zc->notif); |
| 947 | zc->notif = NULL; |
| 948 | } |
| 949 | } |
| 950 | |
| 951 | #define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF) |
| 952 | #define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE) |
| 953 | |
| 954 | int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 955 | { |
| 956 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 957 | struct io_ring_ctx *ctx = req->ctx; |
| 958 | struct io_kiocb *notif; |
| 959 | |
| 960 | if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3))) |
| 961 | return -EINVAL; |
| 962 | /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */ |
| 963 | if (req->flags & REQ_F_CQE_SKIP) |
| 964 | return -EINVAL; |
| 965 | |
| 966 | notif = zc->notif = io_alloc_notif(ctx); |
| 967 | if (!notif) |
| 968 | return -ENOMEM; |
| 969 | notif->cqe.user_data = req->cqe.user_data; |
| 970 | notif->cqe.res = 0; |
| 971 | notif->cqe.flags = IORING_CQE_F_NOTIF; |
| 972 | req->flags |= REQ_F_NEED_CLEANUP; |
| 973 | |
| 974 | zc->flags = READ_ONCE(sqe->ioprio); |
| 975 | if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) { |
| 976 | if (zc->flags & ~IO_ZC_FLAGS_VALID) |
| 977 | return -EINVAL; |
| 978 | if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) { |
| 979 | io_notif_set_extended(notif); |
| 980 | io_notif_to_data(notif)->zc_report = true; |
| 981 | } |
| 982 | } |
| 983 | |
| 984 | if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
| 985 | unsigned idx = READ_ONCE(sqe->buf_index); |
| 986 | |
| 987 | if (unlikely(idx >= ctx->nr_user_bufs)) |
| 988 | return -EFAULT; |
| 989 | idx = array_index_nospec(idx, ctx->nr_user_bufs); |
| 990 | req->imu = READ_ONCE(ctx->user_bufs[idx]); |
| 991 | io_req_set_rsrc_node(notif, ctx, 0); |
| 992 | } |
| 993 | |
| 994 | if (req->opcode == IORING_OP_SEND_ZC) { |
| 995 | if (READ_ONCE(sqe->__pad3[0])) |
| 996 | return -EINVAL; |
| 997 | zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 998 | zc->addr_len = READ_ONCE(sqe->addr_len); |
| 999 | } else { |
| 1000 | if (unlikely(sqe->addr2 || sqe->file_index)) |
| 1001 | return -EINVAL; |
| 1002 | if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF)) |
| 1003 | return -EINVAL; |
| 1004 | } |
| 1005 | |
| 1006 | zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 1007 | zc->len = READ_ONCE(sqe->len); |
| 1008 | zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; |
| 1009 | if (zc->msg_flags & MSG_DONTWAIT) |
| 1010 | req->flags |= REQ_F_NOWAIT; |
| 1011 | |
| 1012 | zc->done_io = 0; |
| 1013 | |
| 1014 | #ifdef CONFIG_COMPAT |
| 1015 | if (req->ctx->compat) |
| 1016 | zc->msg_flags |= MSG_CMSG_COMPAT; |
| 1017 | #endif |
| 1018 | return 0; |
| 1019 | } |
| 1020 | |
| 1021 | static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb, |
| 1022 | struct iov_iter *from, size_t length) |
| 1023 | { |
| 1024 | skb_zcopy_downgrade_managed(skb); |
| 1025 | return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); |
| 1026 | } |
| 1027 | |
| 1028 | static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, |
| 1029 | struct iov_iter *from, size_t length) |
| 1030 | { |
| 1031 | struct skb_shared_info *shinfo = skb_shinfo(skb); |
| 1032 | int frag = shinfo->nr_frags; |
| 1033 | int ret = 0; |
| 1034 | struct bvec_iter bi; |
| 1035 | ssize_t copied = 0; |
| 1036 | unsigned long truesize = 0; |
| 1037 | |
| 1038 | if (!frag) |
| 1039 | shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; |
| 1040 | else if (unlikely(!skb_zcopy_managed(skb))) |
| 1041 | return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); |
| 1042 | |
| 1043 | bi.bi_size = min(from->count, length); |
| 1044 | bi.bi_bvec_done = from->iov_offset; |
| 1045 | bi.bi_idx = 0; |
| 1046 | |
| 1047 | while (bi.bi_size && frag < MAX_SKB_FRAGS) { |
| 1048 | struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); |
| 1049 | |
| 1050 | copied += v.bv_len; |
| 1051 | truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); |
| 1052 | __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, |
| 1053 | v.bv_offset, v.bv_len); |
| 1054 | bvec_iter_advance_single(from->bvec, &bi, v.bv_len); |
| 1055 | } |
| 1056 | if (bi.bi_size) |
| 1057 | ret = -EMSGSIZE; |
| 1058 | |
| 1059 | shinfo->nr_frags = frag; |
| 1060 | from->bvec += bi.bi_idx; |
| 1061 | from->nr_segs -= bi.bi_idx; |
| 1062 | from->count -= copied; |
| 1063 | from->iov_offset = bi.bi_bvec_done; |
| 1064 | |
| 1065 | skb->data_len += copied; |
| 1066 | skb->len += copied; |
| 1067 | skb->truesize += truesize; |
| 1068 | |
| 1069 | if (sk && sk->sk_type == SOCK_STREAM) { |
| 1070 | sk_wmem_queued_add(sk, truesize); |
| 1071 | if (!skb_zcopy_pure(skb)) |
| 1072 | sk_mem_charge(sk, truesize); |
| 1073 | } else { |
| 1074 | refcount_add(truesize, &skb->sk->sk_wmem_alloc); |
| 1075 | } |
| 1076 | return ret; |
| 1077 | } |
| 1078 | |
| 1079 | int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) |
| 1080 | { |
| 1081 | struct sockaddr_storage __address; |
| 1082 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 1083 | struct msghdr msg; |
| 1084 | struct socket *sock; |
| 1085 | unsigned msg_flags; |
| 1086 | int ret, min_ret = 0; |
| 1087 | |
| 1088 | sock = sock_from_file(req->file); |
| 1089 | if (unlikely(!sock)) |
| 1090 | return -ENOTSOCK; |
| 1091 | if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) |
| 1092 | return -EOPNOTSUPP; |
| 1093 | |
| 1094 | msg.msg_name = NULL; |
| 1095 | msg.msg_control = NULL; |
| 1096 | msg.msg_controllen = 0; |
| 1097 | msg.msg_namelen = 0; |
| 1098 | |
| 1099 | if (zc->addr) { |
| 1100 | if (req_has_async_data(req)) { |
| 1101 | struct io_async_msghdr *io = req->async_data; |
| 1102 | |
| 1103 | msg.msg_name = &io->addr; |
| 1104 | } else { |
| 1105 | ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); |
| 1106 | if (unlikely(ret < 0)) |
| 1107 | return ret; |
| 1108 | msg.msg_name = (struct sockaddr *)&__address; |
| 1109 | } |
| 1110 | msg.msg_namelen = zc->addr_len; |
| 1111 | } |
| 1112 | |
| 1113 | if (!(req->flags & REQ_F_POLLED) && |
| 1114 | (zc->flags & IORING_RECVSEND_POLL_FIRST)) |
| 1115 | return io_setup_async_addr(req, &__address, issue_flags); |
| 1116 | |
| 1117 | if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
| 1118 | ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu, |
| 1119 | (u64)(uintptr_t)zc->buf, zc->len); |
| 1120 | if (unlikely(ret)) |
| 1121 | return ret; |
| 1122 | msg.sg_from_iter = io_sg_from_iter; |
| 1123 | } else { |
| 1124 | io_notif_set_extended(zc->notif); |
| 1125 | ret = import_ubuf(ITER_SOURCE, zc->buf, zc->len, &msg.msg_iter); |
| 1126 | if (unlikely(ret)) |
| 1127 | return ret; |
| 1128 | ret = io_notif_account_mem(zc->notif, zc->len); |
| 1129 | if (unlikely(ret)) |
| 1130 | return ret; |
| 1131 | msg.sg_from_iter = io_sg_from_iter_iovec; |
| 1132 | } |
| 1133 | |
| 1134 | msg_flags = zc->msg_flags | MSG_ZEROCOPY; |
| 1135 | if (issue_flags & IO_URING_F_NONBLOCK) |
| 1136 | msg_flags |= MSG_DONTWAIT; |
| 1137 | if (msg_flags & MSG_WAITALL) |
| 1138 | min_ret = iov_iter_count(&msg.msg_iter); |
| 1139 | |
| 1140 | msg.msg_flags = msg_flags; |
| 1141 | msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; |
| 1142 | ret = sock_sendmsg(sock, &msg); |
| 1143 | |
| 1144 | if (unlikely(ret < min_ret)) { |
| 1145 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) |
| 1146 | return io_setup_async_addr(req, &__address, issue_flags); |
| 1147 | |
| 1148 | if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { |
| 1149 | zc->len -= ret; |
| 1150 | zc->buf += ret; |
| 1151 | zc->done_io += ret; |
| 1152 | req->flags |= REQ_F_PARTIAL_IO; |
| 1153 | return io_setup_async_addr(req, &__address, issue_flags); |
| 1154 | } |
| 1155 | if (ret == -ERESTARTSYS) |
| 1156 | ret = -EINTR; |
| 1157 | req_set_fail(req); |
| 1158 | } |
| 1159 | |
| 1160 | if (ret >= 0) |
| 1161 | ret += zc->done_io; |
| 1162 | else if (zc->done_io) |
| 1163 | ret = zc->done_io; |
| 1164 | |
| 1165 | /* |
| 1166 | * If we're in io-wq we can't rely on tw ordering guarantees, defer |
| 1167 | * flushing notif to io_send_zc_cleanup() |
| 1168 | */ |
| 1169 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { |
| 1170 | io_notif_flush(zc->notif); |
| 1171 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 1172 | } |
| 1173 | io_req_set_res(req, ret, IORING_CQE_F_MORE); |
| 1174 | return IOU_OK; |
| 1175 | } |
| 1176 | |
| 1177 | int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags) |
| 1178 | { |
| 1179 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 1180 | struct io_async_msghdr iomsg, *kmsg; |
| 1181 | struct socket *sock; |
| 1182 | unsigned flags; |
| 1183 | int ret, min_ret = 0; |
| 1184 | |
| 1185 | io_notif_set_extended(sr->notif); |
| 1186 | |
| 1187 | sock = sock_from_file(req->file); |
| 1188 | if (unlikely(!sock)) |
| 1189 | return -ENOTSOCK; |
| 1190 | if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) |
| 1191 | return -EOPNOTSUPP; |
| 1192 | |
| 1193 | if (req_has_async_data(req)) { |
| 1194 | kmsg = req->async_data; |
| 1195 | } else { |
| 1196 | ret = io_sendmsg_copy_hdr(req, &iomsg); |
| 1197 | if (ret) |
| 1198 | return ret; |
| 1199 | kmsg = &iomsg; |
| 1200 | } |
| 1201 | |
| 1202 | if (!(req->flags & REQ_F_POLLED) && |
| 1203 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) |
| 1204 | return io_setup_async_msg(req, kmsg, issue_flags); |
| 1205 | |
| 1206 | flags = sr->msg_flags | MSG_ZEROCOPY; |
| 1207 | if (issue_flags & IO_URING_F_NONBLOCK) |
| 1208 | flags |= MSG_DONTWAIT; |
| 1209 | if (flags & MSG_WAITALL) |
| 1210 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); |
| 1211 | |
| 1212 | kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg; |
| 1213 | kmsg->msg.sg_from_iter = io_sg_from_iter_iovec; |
| 1214 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
| 1215 | |
| 1216 | if (unlikely(ret < min_ret)) { |
| 1217 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) |
| 1218 | return io_setup_async_msg(req, kmsg, issue_flags); |
| 1219 | |
| 1220 | if (ret > 0 && io_net_retry(sock, flags)) { |
| 1221 | sr->done_io += ret; |
| 1222 | req->flags |= REQ_F_PARTIAL_IO; |
| 1223 | return io_setup_async_msg(req, kmsg, issue_flags); |
| 1224 | } |
| 1225 | if (ret == -ERESTARTSYS) |
| 1226 | ret = -EINTR; |
| 1227 | req_set_fail(req); |
| 1228 | } |
| 1229 | /* fast path, check for non-NULL to avoid function call */ |
| 1230 | if (kmsg->free_iov) { |
| 1231 | kfree(kmsg->free_iov); |
| 1232 | kmsg->free_iov = NULL; |
| 1233 | } |
| 1234 | |
| 1235 | io_netmsg_recycle(req, issue_flags); |
| 1236 | if (ret >= 0) |
| 1237 | ret += sr->done_io; |
| 1238 | else if (sr->done_io) |
| 1239 | ret = sr->done_io; |
| 1240 | |
| 1241 | /* |
| 1242 | * If we're in io-wq we can't rely on tw ordering guarantees, defer |
| 1243 | * flushing notif to io_send_zc_cleanup() |
| 1244 | */ |
| 1245 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { |
| 1246 | io_notif_flush(sr->notif); |
| 1247 | req->flags &= ~REQ_F_NEED_CLEANUP; |
| 1248 | } |
| 1249 | io_req_set_res(req, ret, IORING_CQE_F_MORE); |
| 1250 | return IOU_OK; |
| 1251 | } |
| 1252 | |
| 1253 | void io_sendrecv_fail(struct io_kiocb *req) |
| 1254 | { |
| 1255 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| 1256 | |
| 1257 | if (req->flags & REQ_F_PARTIAL_IO) |
| 1258 | req->cqe.res = sr->done_io; |
| 1259 | |
| 1260 | if ((req->flags & REQ_F_NEED_CLEANUP) && |
| 1261 | (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) |
| 1262 | req->cqe.flags |= IORING_CQE_F_MORE; |
| 1263 | } |
| 1264 | |
| 1265 | int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 1266 | { |
| 1267 | struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
| 1268 | unsigned flags; |
| 1269 | |
| 1270 | if (sqe->len || sqe->buf_index) |
| 1271 | return -EINVAL; |
| 1272 | |
| 1273 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 1274 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); |
| 1275 | accept->flags = READ_ONCE(sqe->accept_flags); |
| 1276 | accept->nofile = rlimit(RLIMIT_NOFILE); |
| 1277 | flags = READ_ONCE(sqe->ioprio); |
| 1278 | if (flags & ~IORING_ACCEPT_MULTISHOT) |
| 1279 | return -EINVAL; |
| 1280 | |
| 1281 | accept->file_slot = READ_ONCE(sqe->file_index); |
| 1282 | if (accept->file_slot) { |
| 1283 | if (accept->flags & SOCK_CLOEXEC) |
| 1284 | return -EINVAL; |
| 1285 | if (flags & IORING_ACCEPT_MULTISHOT && |
| 1286 | accept->file_slot != IORING_FILE_INDEX_ALLOC) |
| 1287 | return -EINVAL; |
| 1288 | } |
| 1289 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
| 1290 | return -EINVAL; |
| 1291 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) |
| 1292 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; |
| 1293 | if (flags & IORING_ACCEPT_MULTISHOT) |
| 1294 | req->flags |= REQ_F_APOLL_MULTISHOT; |
| 1295 | return 0; |
| 1296 | } |
| 1297 | |
| 1298 | int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
| 1299 | { |
| 1300 | struct io_ring_ctx *ctx = req->ctx; |
| 1301 | struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
| 1302 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
| 1303 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
| 1304 | bool fixed = !!accept->file_slot; |
| 1305 | struct file *file; |
| 1306 | int ret, fd; |
| 1307 | |
| 1308 | if (!io_check_multishot(req, issue_flags)) |
| 1309 | return -EAGAIN; |
| 1310 | retry: |
| 1311 | if (!fixed) { |
| 1312 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); |
| 1313 | if (unlikely(fd < 0)) |
| 1314 | return fd; |
| 1315 | } |
| 1316 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, |
| 1317 | accept->flags); |
| 1318 | if (IS_ERR(file)) { |
| 1319 | if (!fixed) |
| 1320 | put_unused_fd(fd); |
| 1321 | ret = PTR_ERR(file); |
| 1322 | if (ret == -EAGAIN && force_nonblock) { |
| 1323 | /* |
| 1324 | * if it's multishot and polled, we don't need to |
| 1325 | * return EAGAIN to arm the poll infra since it |
| 1326 | * has already been done |
| 1327 | */ |
| 1328 | if (issue_flags & IO_URING_F_MULTISHOT) |
| 1329 | ret = IOU_ISSUE_SKIP_COMPLETE; |
| 1330 | return ret; |
| 1331 | } |
| 1332 | if (ret == -ERESTARTSYS) |
| 1333 | ret = -EINTR; |
| 1334 | req_set_fail(req); |
| 1335 | } else if (!fixed) { |
| 1336 | fd_install(fd, file); |
| 1337 | ret = fd; |
| 1338 | } else { |
| 1339 | ret = io_fixed_fd_install(req, issue_flags, file, |
| 1340 | accept->file_slot); |
| 1341 | } |
| 1342 | |
| 1343 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { |
| 1344 | io_req_set_res(req, ret, 0); |
| 1345 | return IOU_OK; |
| 1346 | } |
| 1347 | |
| 1348 | if (ret < 0) |
| 1349 | return ret; |
| 1350 | if (io_aux_cqe(ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, |
| 1351 | req->cqe.user_data, ret, IORING_CQE_F_MORE, true)) |
| 1352 | goto retry; |
| 1353 | |
| 1354 | return -ECANCELED; |
| 1355 | } |
| 1356 | |
| 1357 | int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 1358 | { |
| 1359 | struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
| 1360 | |
| 1361 | if (sqe->addr || sqe->rw_flags || sqe->buf_index) |
| 1362 | return -EINVAL; |
| 1363 | |
| 1364 | sock->domain = READ_ONCE(sqe->fd); |
| 1365 | sock->type = READ_ONCE(sqe->off); |
| 1366 | sock->protocol = READ_ONCE(sqe->len); |
| 1367 | sock->file_slot = READ_ONCE(sqe->file_index); |
| 1368 | sock->nofile = rlimit(RLIMIT_NOFILE); |
| 1369 | |
| 1370 | sock->flags = sock->type & ~SOCK_TYPE_MASK; |
| 1371 | if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) |
| 1372 | return -EINVAL; |
| 1373 | if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
| 1374 | return -EINVAL; |
| 1375 | return 0; |
| 1376 | } |
| 1377 | |
| 1378 | int io_socket(struct io_kiocb *req, unsigned int issue_flags) |
| 1379 | { |
| 1380 | struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
| 1381 | bool fixed = !!sock->file_slot; |
| 1382 | struct file *file; |
| 1383 | int ret, fd; |
| 1384 | |
| 1385 | if (!fixed) { |
| 1386 | fd = __get_unused_fd_flags(sock->flags, sock->nofile); |
| 1387 | if (unlikely(fd < 0)) |
| 1388 | return fd; |
| 1389 | } |
| 1390 | file = __sys_socket_file(sock->domain, sock->type, sock->protocol); |
| 1391 | if (IS_ERR(file)) { |
| 1392 | if (!fixed) |
| 1393 | put_unused_fd(fd); |
| 1394 | ret = PTR_ERR(file); |
| 1395 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) |
| 1396 | return -EAGAIN; |
| 1397 | if (ret == -ERESTARTSYS) |
| 1398 | ret = -EINTR; |
| 1399 | req_set_fail(req); |
| 1400 | } else if (!fixed) { |
| 1401 | fd_install(fd, file); |
| 1402 | ret = fd; |
| 1403 | } else { |
| 1404 | ret = io_fixed_fd_install(req, issue_flags, file, |
| 1405 | sock->file_slot); |
| 1406 | } |
| 1407 | io_req_set_res(req, ret, 0); |
| 1408 | return IOU_OK; |
| 1409 | } |
| 1410 | |
| 1411 | int io_connect_prep_async(struct io_kiocb *req) |
| 1412 | { |
| 1413 | struct io_async_connect *io = req->async_data; |
| 1414 | struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
| 1415 | |
| 1416 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); |
| 1417 | } |
| 1418 | |
| 1419 | int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| 1420 | { |
| 1421 | struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
| 1422 | |
| 1423 | if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) |
| 1424 | return -EINVAL; |
| 1425 | |
| 1426 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| 1427 | conn->addr_len = READ_ONCE(sqe->addr2); |
| 1428 | conn->in_progress = conn->seen_econnaborted = false; |
| 1429 | return 0; |
| 1430 | } |
| 1431 | |
| 1432 | int io_connect(struct io_kiocb *req, unsigned int issue_flags) |
| 1433 | { |
| 1434 | struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); |
| 1435 | struct io_async_connect __io, *io; |
| 1436 | unsigned file_flags; |
| 1437 | int ret; |
| 1438 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
| 1439 | |
| 1440 | if (connect->in_progress) { |
| 1441 | struct socket *socket; |
| 1442 | |
| 1443 | ret = -ENOTSOCK; |
| 1444 | socket = sock_from_file(req->file); |
| 1445 | if (socket) |
| 1446 | ret = sock_error(socket->sk); |
| 1447 | goto out; |
| 1448 | } |
| 1449 | |
| 1450 | if (req_has_async_data(req)) { |
| 1451 | io = req->async_data; |
| 1452 | } else { |
| 1453 | ret = move_addr_to_kernel(connect->addr, |
| 1454 | connect->addr_len, |
| 1455 | &__io.address); |
| 1456 | if (ret) |
| 1457 | goto out; |
| 1458 | io = &__io; |
| 1459 | } |
| 1460 | |
| 1461 | file_flags = force_nonblock ? O_NONBLOCK : 0; |
| 1462 | |
| 1463 | ret = __sys_connect_file(req->file, &io->address, |
| 1464 | connect->addr_len, file_flags); |
| 1465 | if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED) |
| 1466 | && force_nonblock) { |
| 1467 | if (ret == -EINPROGRESS) { |
| 1468 | connect->in_progress = true; |
| 1469 | return -EAGAIN; |
| 1470 | } |
| 1471 | if (ret == -ECONNABORTED) { |
| 1472 | if (connect->seen_econnaborted) |
| 1473 | goto out; |
| 1474 | connect->seen_econnaborted = true; |
| 1475 | } |
| 1476 | if (req_has_async_data(req)) |
| 1477 | return -EAGAIN; |
| 1478 | if (io_alloc_async_data(req)) { |
| 1479 | ret = -ENOMEM; |
| 1480 | goto out; |
| 1481 | } |
| 1482 | memcpy(req->async_data, &__io, sizeof(__io)); |
| 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 |