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Merge tag '6.6-rc-ksmbd-fixes-part1' of git://git.samba.org/ksmbd
[thirdparty/linux.git] / io_uring / net.c
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_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER,
645 *ret, cflags | IORING_CQE_F_MORE)) {
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_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER,
1370 ret, IORING_CQE_F_MORE))
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
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