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 int iou_flags;
32 u32 file_slot;
33 unsigned long nofile;
34 };
35
36 struct io_socket {
37 struct file *file;
38 int domain;
39 int type;
40 int protocol;
41 int flags;
42 u32 file_slot;
43 unsigned long nofile;
44 };
45
46 struct io_connect {
47 struct file *file;
48 struct sockaddr __user *addr;
49 int addr_len;
50 bool in_progress;
51 bool seen_econnaborted;
52 };
53
54 struct io_bind {
55 struct file *file;
56 int addr_len;
57 };
58
59 struct io_listen {
60 struct file *file;
61 int backlog;
62 };
63
64 struct io_sr_msg {
65 struct file *file;
66 union {
67 struct compat_msghdr __user *umsg_compat;
68 struct user_msghdr __user *umsg;
69 void __user *buf;
70 };
71 int len;
72 unsigned done_io;
73 unsigned msg_flags;
74 unsigned nr_multishot_loops;
75 u16 flags;
76 /* initialised and used only by !msg send variants */
77 u16 buf_group;
78 u16 buf_index;
79 void __user *msg_control;
80 /* used only for send zerocopy */
81 struct io_kiocb *notif;
82 };
83
84 /*
85 * Number of times we'll try and do receives if there's more data. If we
86 * exceed this limit, then add us to the back of the queue and retry from
87 * there. This helps fairness between flooding clients.
88 */
89 #define MULTISHOT_MAX_RETRY 32
90
io_shutdown_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)91 int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
92 {
93 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
94
95 if (unlikely(sqe->off || sqe->addr || sqe->rw_flags ||
96 sqe->buf_index || sqe->splice_fd_in))
97 return -EINVAL;
98
99 shutdown->how = READ_ONCE(sqe->len);
100 req->flags |= REQ_F_FORCE_ASYNC;
101 return 0;
102 }
103
io_shutdown(struct io_kiocb * req,unsigned int issue_flags)104 int io_shutdown(struct io_kiocb *req, unsigned int issue_flags)
105 {
106 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
107 struct socket *sock;
108 int ret;
109
110 WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
111
112 sock = sock_from_file(req->file);
113 if (unlikely(!sock))
114 return -ENOTSOCK;
115
116 ret = __sys_shutdown_sock(sock, shutdown->how);
117 io_req_set_res(req, ret, 0);
118 return IOU_OK;
119 }
120
io_net_retry(struct socket * sock,int flags)121 static bool io_net_retry(struct socket *sock, int flags)
122 {
123 if (!(flags & MSG_WAITALL))
124 return false;
125 return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET;
126 }
127
io_netmsg_iovec_free(struct io_async_msghdr * kmsg)128 static void io_netmsg_iovec_free(struct io_async_msghdr *kmsg)
129 {
130 if (kmsg->free_iov) {
131 kfree(kmsg->free_iov);
132 kmsg->free_iov_nr = 0;
133 kmsg->free_iov = NULL;
134 }
135 }
136
io_netmsg_recycle(struct io_kiocb * req,unsigned int issue_flags)137 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
138 {
139 struct io_async_msghdr *hdr = req->async_data;
140
141 /* can't recycle, ensure we free the iovec if we have one */
142 if (unlikely(issue_flags & IO_URING_F_UNLOCKED)) {
143 io_netmsg_iovec_free(hdr);
144 return;
145 }
146
147 /* Let normal cleanup path reap it if we fail adding to the cache */
148 io_alloc_cache_kasan(&hdr->free_iov, &hdr->free_iov_nr);
149 if (io_alloc_cache_put(&req->ctx->netmsg_cache, hdr)) {
150 req->async_data = NULL;
151 req->flags &= ~(REQ_F_ASYNC_DATA|REQ_F_NEED_CLEANUP);
152 }
153 }
154
io_msg_alloc_async(struct io_kiocb * req)155 static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req)
156 {
157 struct io_ring_ctx *ctx = req->ctx;
158 struct io_async_msghdr *hdr;
159
160 hdr = io_uring_alloc_async_data(&ctx->netmsg_cache, req);
161 if (!hdr)
162 return NULL;
163
164 /* If the async data was cached, we might have an iov cached inside. */
165 if (hdr->free_iov)
166 req->flags |= REQ_F_NEED_CLEANUP;
167 return hdr;
168 }
169
170 /* assign new iovec to kmsg, if we need to */
io_net_vec_assign(struct io_kiocb * req,struct io_async_msghdr * kmsg,struct iovec * iov)171 static void io_net_vec_assign(struct io_kiocb *req, struct io_async_msghdr *kmsg,
172 struct iovec *iov)
173 {
174 if (iov) {
175 req->flags |= REQ_F_NEED_CLEANUP;
176 kmsg->free_iov_nr = kmsg->msg.msg_iter.nr_segs;
177 if (kmsg->free_iov)
178 kfree(kmsg->free_iov);
179 kmsg->free_iov = iov;
180 }
181 }
182
io_mshot_prep_retry(struct io_kiocb * req,struct io_async_msghdr * kmsg)183 static inline void io_mshot_prep_retry(struct io_kiocb *req,
184 struct io_async_msghdr *kmsg)
185 {
186 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
187
188 req->flags &= ~REQ_F_BL_EMPTY;
189 sr->done_io = 0;
190 sr->len = 0; /* get from the provided buffer */
191 req->buf_index = sr->buf_group;
192 }
193
194 #ifdef CONFIG_COMPAT
io_compat_msg_copy_hdr(struct io_kiocb * req,struct io_async_msghdr * iomsg,struct compat_msghdr * msg,int ddir)195 static int io_compat_msg_copy_hdr(struct io_kiocb *req,
196 struct io_async_msghdr *iomsg,
197 struct compat_msghdr *msg, int ddir)
198 {
199 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
200 struct compat_iovec __user *uiov;
201 struct iovec *iov;
202 int ret, nr_segs;
203
204 if (iomsg->free_iov) {
205 nr_segs = iomsg->free_iov_nr;
206 iov = iomsg->free_iov;
207 } else {
208 iov = &iomsg->fast_iov;
209 nr_segs = 1;
210 }
211
212 if (copy_from_user(msg, sr->umsg_compat, sizeof(*msg)))
213 return -EFAULT;
214
215 uiov = compat_ptr(msg->msg_iov);
216 if (req->flags & REQ_F_BUFFER_SELECT) {
217 compat_ssize_t clen;
218
219 if (msg->msg_iovlen == 0) {
220 sr->len = iov->iov_len = 0;
221 iov->iov_base = NULL;
222 } else if (msg->msg_iovlen > 1) {
223 return -EINVAL;
224 } else {
225 if (!access_ok(uiov, sizeof(*uiov)))
226 return -EFAULT;
227 if (__get_user(clen, &uiov->iov_len))
228 return -EFAULT;
229 if (clen < 0)
230 return -EINVAL;
231 sr->len = clen;
232 }
233
234 return 0;
235 }
236
237 ret = __import_iovec(ddir, (struct iovec __user *)uiov, msg->msg_iovlen,
238 nr_segs, &iov, &iomsg->msg.msg_iter, true);
239 if (unlikely(ret < 0))
240 return ret;
241
242 io_net_vec_assign(req, iomsg, iov);
243 return 0;
244 }
245 #endif
246
io_msg_copy_hdr(struct io_kiocb * req,struct io_async_msghdr * iomsg,struct user_msghdr * msg,int ddir)247 static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg,
248 struct user_msghdr *msg, int ddir)
249 {
250 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
251 struct user_msghdr __user *umsg = sr->umsg;
252 struct iovec *iov;
253 int ret, nr_segs;
254
255 if (iomsg->free_iov) {
256 nr_segs = iomsg->free_iov_nr;
257 iov = iomsg->free_iov;
258 } else {
259 iov = &iomsg->fast_iov;
260 nr_segs = 1;
261 }
262
263 if (!user_access_begin(umsg, sizeof(*umsg)))
264 return -EFAULT;
265
266 ret = -EFAULT;
267 unsafe_get_user(msg->msg_name, &umsg->msg_name, ua_end);
268 unsafe_get_user(msg->msg_namelen, &umsg->msg_namelen, ua_end);
269 unsafe_get_user(msg->msg_iov, &umsg->msg_iov, ua_end);
270 unsafe_get_user(msg->msg_iovlen, &umsg->msg_iovlen, ua_end);
271 unsafe_get_user(msg->msg_control, &umsg->msg_control, ua_end);
272 unsafe_get_user(msg->msg_controllen, &umsg->msg_controllen, ua_end);
273 msg->msg_flags = 0;
274
275 if (req->flags & REQ_F_BUFFER_SELECT) {
276 if (msg->msg_iovlen == 0) {
277 sr->len = iov->iov_len = 0;
278 iov->iov_base = NULL;
279 } else if (msg->msg_iovlen > 1) {
280 ret = -EINVAL;
281 goto ua_end;
282 } else {
283 struct iovec __user *uiov = msg->msg_iov;
284
285 /* we only need the length for provided buffers */
286 if (!access_ok(&uiov->iov_len, sizeof(uiov->iov_len)))
287 goto ua_end;
288 unsafe_get_user(iov->iov_len, &uiov->iov_len, ua_end);
289 sr->len = iov->iov_len;
290 }
291 ret = 0;
292 ua_end:
293 user_access_end();
294 return ret;
295 }
296
297 user_access_end();
298 ret = __import_iovec(ddir, msg->msg_iov, msg->msg_iovlen, nr_segs,
299 &iov, &iomsg->msg.msg_iter, false);
300 if (unlikely(ret < 0))
301 return ret;
302
303 io_net_vec_assign(req, iomsg, iov);
304 return 0;
305 }
306
io_sendmsg_copy_hdr(struct io_kiocb * req,struct io_async_msghdr * iomsg)307 static int io_sendmsg_copy_hdr(struct io_kiocb *req,
308 struct io_async_msghdr *iomsg)
309 {
310 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
311 struct user_msghdr msg;
312 int ret;
313
314 iomsg->msg.msg_name = &iomsg->addr;
315 iomsg->msg.msg_iter.nr_segs = 0;
316
317 #ifdef CONFIG_COMPAT
318 if (unlikely(req->ctx->compat)) {
319 struct compat_msghdr cmsg;
320
321 ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_SOURCE);
322 if (unlikely(ret))
323 return ret;
324
325 ret = __get_compat_msghdr(&iomsg->msg, &cmsg, NULL);
326 sr->msg_control = iomsg->msg.msg_control_user;
327 return ret;
328 }
329 #endif
330
331 ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_SOURCE);
332 if (unlikely(ret))
333 return ret;
334
335 ret = __copy_msghdr(&iomsg->msg, &msg, NULL);
336
337 /* save msg_control as sys_sendmsg() overwrites it */
338 sr->msg_control = iomsg->msg.msg_control_user;
339 return ret;
340 }
341
io_sendmsg_recvmsg_cleanup(struct io_kiocb * req)342 void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req)
343 {
344 struct io_async_msghdr *io = req->async_data;
345
346 io_netmsg_iovec_free(io);
347 }
348
io_send_setup(struct io_kiocb * req,const struct io_uring_sqe * sqe)349 static int io_send_setup(struct io_kiocb *req, const struct io_uring_sqe *sqe)
350 {
351 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
352 struct io_async_msghdr *kmsg = req->async_data;
353 void __user *addr;
354 u16 addr_len;
355 int ret;
356
357 sr->buf = u64_to_user_ptr(READ_ONCE(sqe->addr));
358
359 if (READ_ONCE(sqe->__pad3[0]))
360 return -EINVAL;
361
362 kmsg->msg.msg_name = NULL;
363 kmsg->msg.msg_namelen = 0;
364 kmsg->msg.msg_control = NULL;
365 kmsg->msg.msg_controllen = 0;
366 kmsg->msg.msg_ubuf = NULL;
367
368 addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
369 addr_len = READ_ONCE(sqe->addr_len);
370 if (addr) {
371 ret = move_addr_to_kernel(addr, addr_len, &kmsg->addr);
372 if (unlikely(ret < 0))
373 return ret;
374 kmsg->msg.msg_name = &kmsg->addr;
375 kmsg->msg.msg_namelen = addr_len;
376 }
377 if (!io_do_buffer_select(req)) {
378 ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len,
379 &kmsg->msg.msg_iter);
380 if (unlikely(ret < 0))
381 return ret;
382 }
383 return 0;
384 }
385
io_sendmsg_setup(struct io_kiocb * req,const struct io_uring_sqe * sqe)386 static int io_sendmsg_setup(struct io_kiocb *req, const struct io_uring_sqe *sqe)
387 {
388 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
389 struct io_async_msghdr *kmsg = req->async_data;
390 int ret;
391
392 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
393
394 ret = io_sendmsg_copy_hdr(req, kmsg);
395 if (!ret)
396 req->flags |= REQ_F_NEED_CLEANUP;
397 return ret;
398 }
399
400 #define SENDMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_BUNDLE)
401
io_sendmsg_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)402 int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
403 {
404 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
405
406 sr->done_io = 0;
407
408 if (req->opcode != IORING_OP_SEND) {
409 if (sqe->addr2 || sqe->file_index)
410 return -EINVAL;
411 }
412
413 sr->len = READ_ONCE(sqe->len);
414 sr->flags = READ_ONCE(sqe->ioprio);
415 if (sr->flags & ~SENDMSG_FLAGS)
416 return -EINVAL;
417 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
418 if (sr->msg_flags & MSG_DONTWAIT)
419 req->flags |= REQ_F_NOWAIT;
420 if (sr->flags & IORING_RECVSEND_BUNDLE) {
421 if (req->opcode == IORING_OP_SENDMSG)
422 return -EINVAL;
423 if (!(req->flags & REQ_F_BUFFER_SELECT))
424 return -EINVAL;
425 sr->msg_flags |= MSG_WAITALL;
426 sr->buf_group = req->buf_index;
427 req->buf_list = NULL;
428 }
429
430 #ifdef CONFIG_COMPAT
431 if (req->ctx->compat)
432 sr->msg_flags |= MSG_CMSG_COMPAT;
433 #endif
434 if (unlikely(!io_msg_alloc_async(req)))
435 return -ENOMEM;
436 if (req->opcode != IORING_OP_SENDMSG)
437 return io_send_setup(req, sqe);
438 return io_sendmsg_setup(req, sqe);
439 }
440
io_req_msg_cleanup(struct io_kiocb * req,unsigned int issue_flags)441 static void io_req_msg_cleanup(struct io_kiocb *req,
442 unsigned int issue_flags)
443 {
444 io_netmsg_recycle(req, issue_flags);
445 }
446
447 /*
448 * For bundle completions, we need to figure out how many segments we consumed.
449 * A bundle could be using a single ITER_UBUF if that's all we mapped, or it
450 * could be using an ITER_IOVEC. If the latter, then if we consumed all of
451 * the segments, then it's a trivial questiont o answer. If we have residual
452 * data in the iter, then loop the segments to figure out how much we
453 * transferred.
454 */
io_bundle_nbufs(struct io_async_msghdr * kmsg,int ret)455 static int io_bundle_nbufs(struct io_async_msghdr *kmsg, int ret)
456 {
457 struct iovec *iov;
458 int nbufs;
459
460 /* no data is always zero segments, and a ubuf is always 1 segment */
461 if (ret <= 0)
462 return 0;
463 if (iter_is_ubuf(&kmsg->msg.msg_iter))
464 return 1;
465
466 iov = kmsg->free_iov;
467 if (!iov)
468 iov = &kmsg->fast_iov;
469
470 /* if all data was transferred, it's basic pointer math */
471 if (!iov_iter_count(&kmsg->msg.msg_iter))
472 return iter_iov(&kmsg->msg.msg_iter) - iov;
473
474 /* short transfer, count segments */
475 nbufs = 0;
476 do {
477 int this_len = min_t(int, iov[nbufs].iov_len, ret);
478
479 nbufs++;
480 ret -= this_len;
481 } while (ret);
482
483 return nbufs;
484 }
485
io_send_finish(struct io_kiocb * req,int * ret,struct io_async_msghdr * kmsg,unsigned issue_flags)486 static inline bool io_send_finish(struct io_kiocb *req, int *ret,
487 struct io_async_msghdr *kmsg,
488 unsigned issue_flags)
489 {
490 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
491 bool bundle_finished = *ret <= 0;
492 unsigned int cflags;
493
494 if (!(sr->flags & IORING_RECVSEND_BUNDLE)) {
495 cflags = io_put_kbuf(req, *ret, issue_flags);
496 goto finish;
497 }
498
499 cflags = io_put_kbufs(req, *ret, io_bundle_nbufs(kmsg, *ret), issue_flags);
500
501 if (bundle_finished || req->flags & REQ_F_BL_EMPTY)
502 goto finish;
503
504 /*
505 * Fill CQE for this receive and see if we should keep trying to
506 * receive from this socket.
507 */
508 if (io_req_post_cqe(req, *ret, cflags | IORING_CQE_F_MORE)) {
509 io_mshot_prep_retry(req, kmsg);
510 return false;
511 }
512
513 /* Otherwise stop bundle and use the current result. */
514 finish:
515 io_req_set_res(req, *ret, cflags);
516 *ret = IOU_OK;
517 return true;
518 }
519
io_sendmsg(struct io_kiocb * req,unsigned int issue_flags)520 int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
521 {
522 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
523 struct io_async_msghdr *kmsg = req->async_data;
524 struct socket *sock;
525 unsigned flags;
526 int min_ret = 0;
527 int ret;
528
529 sock = sock_from_file(req->file);
530 if (unlikely(!sock))
531 return -ENOTSOCK;
532
533 if (!(req->flags & REQ_F_POLLED) &&
534 (sr->flags & IORING_RECVSEND_POLL_FIRST))
535 return -EAGAIN;
536
537 flags = sr->msg_flags;
538 if (issue_flags & IO_URING_F_NONBLOCK)
539 flags |= MSG_DONTWAIT;
540 if (flags & MSG_WAITALL)
541 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
542
543 kmsg->msg.msg_control_user = sr->msg_control;
544
545 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
546
547 if (ret < min_ret) {
548 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
549 return -EAGAIN;
550 if (ret > 0 && io_net_retry(sock, flags)) {
551 kmsg->msg.msg_controllen = 0;
552 kmsg->msg.msg_control = NULL;
553 sr->done_io += ret;
554 req->flags |= REQ_F_BL_NO_RECYCLE;
555 return -EAGAIN;
556 }
557 if (ret == -ERESTARTSYS)
558 ret = -EINTR;
559 req_set_fail(req);
560 }
561 io_req_msg_cleanup(req, issue_flags);
562 if (ret >= 0)
563 ret += sr->done_io;
564 else if (sr->done_io)
565 ret = sr->done_io;
566 io_req_set_res(req, ret, 0);
567 return IOU_OK;
568 }
569
io_send_select_buffer(struct io_kiocb * req,unsigned int issue_flags,struct io_async_msghdr * kmsg)570 static int io_send_select_buffer(struct io_kiocb *req, unsigned int issue_flags,
571 struct io_async_msghdr *kmsg)
572 {
573 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
574
575 int ret;
576 struct buf_sel_arg arg = {
577 .iovs = &kmsg->fast_iov,
578 .max_len = min_not_zero(sr->len, INT_MAX),
579 .nr_iovs = 1,
580 };
581
582 if (kmsg->free_iov) {
583 arg.nr_iovs = kmsg->free_iov_nr;
584 arg.iovs = kmsg->free_iov;
585 arg.mode = KBUF_MODE_FREE;
586 }
587
588 if (!(sr->flags & IORING_RECVSEND_BUNDLE))
589 arg.nr_iovs = 1;
590 else
591 arg.mode |= KBUF_MODE_EXPAND;
592
593 ret = io_buffers_select(req, &arg, issue_flags);
594 if (unlikely(ret < 0))
595 return ret;
596
597 if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
598 kmsg->free_iov_nr = ret;
599 kmsg->free_iov = arg.iovs;
600 req->flags |= REQ_F_NEED_CLEANUP;
601 }
602 sr->len = arg.out_len;
603
604 if (ret == 1) {
605 sr->buf = arg.iovs[0].iov_base;
606 ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len,
607 &kmsg->msg.msg_iter);
608 if (unlikely(ret))
609 return ret;
610 } else {
611 iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE,
612 arg.iovs, ret, arg.out_len);
613 }
614
615 return 0;
616 }
617
io_send(struct io_kiocb * req,unsigned int issue_flags)618 int io_send(struct io_kiocb *req, unsigned int issue_flags)
619 {
620 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
621 struct io_async_msghdr *kmsg = req->async_data;
622 struct socket *sock;
623 unsigned flags;
624 int min_ret = 0;
625 int ret;
626
627 sock = sock_from_file(req->file);
628 if (unlikely(!sock))
629 return -ENOTSOCK;
630
631 if (!(req->flags & REQ_F_POLLED) &&
632 (sr->flags & IORING_RECVSEND_POLL_FIRST))
633 return -EAGAIN;
634
635 flags = sr->msg_flags;
636 if (issue_flags & IO_URING_F_NONBLOCK)
637 flags |= MSG_DONTWAIT;
638
639 retry_bundle:
640 if (io_do_buffer_select(req)) {
641 ret = io_send_select_buffer(req, issue_flags, kmsg);
642 if (ret)
643 return ret;
644 }
645
646 /*
647 * If MSG_WAITALL is set, or this is a bundle send, then we need
648 * the full amount. If just bundle is set, if we do a short send
649 * then we complete the bundle sequence rather than continue on.
650 */
651 if (flags & MSG_WAITALL || sr->flags & IORING_RECVSEND_BUNDLE)
652 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
653
654 flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
655 kmsg->msg.msg_flags = flags;
656 ret = sock_sendmsg(sock, &kmsg->msg);
657 if (ret < min_ret) {
658 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
659 return -EAGAIN;
660
661 if (ret > 0 && io_net_retry(sock, flags)) {
662 sr->len -= ret;
663 sr->buf += ret;
664 sr->done_io += ret;
665 req->flags |= REQ_F_BL_NO_RECYCLE;
666 return -EAGAIN;
667 }
668 if (ret == -ERESTARTSYS)
669 ret = -EINTR;
670 req_set_fail(req);
671 }
672 if (ret >= 0)
673 ret += sr->done_io;
674 else if (sr->done_io)
675 ret = sr->done_io;
676
677 if (!io_send_finish(req, &ret, kmsg, issue_flags))
678 goto retry_bundle;
679
680 io_req_msg_cleanup(req, issue_flags);
681 return ret;
682 }
683
io_recvmsg_mshot_prep(struct io_kiocb * req,struct io_async_msghdr * iomsg,int namelen,size_t controllen)684 static int io_recvmsg_mshot_prep(struct io_kiocb *req,
685 struct io_async_msghdr *iomsg,
686 int namelen, size_t controllen)
687 {
688 if ((req->flags & (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) ==
689 (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) {
690 int hdr;
691
692 if (unlikely(namelen < 0))
693 return -EOVERFLOW;
694 if (check_add_overflow(sizeof(struct io_uring_recvmsg_out),
695 namelen, &hdr))
696 return -EOVERFLOW;
697 if (check_add_overflow(hdr, controllen, &hdr))
698 return -EOVERFLOW;
699
700 iomsg->namelen = namelen;
701 iomsg->controllen = controllen;
702 return 0;
703 }
704
705 return 0;
706 }
707
io_recvmsg_copy_hdr(struct io_kiocb * req,struct io_async_msghdr * iomsg)708 static int io_recvmsg_copy_hdr(struct io_kiocb *req,
709 struct io_async_msghdr *iomsg)
710 {
711 struct user_msghdr msg;
712 int ret;
713
714 iomsg->msg.msg_name = &iomsg->addr;
715 iomsg->msg.msg_iter.nr_segs = 0;
716
717 #ifdef CONFIG_COMPAT
718 if (unlikely(req->ctx->compat)) {
719 struct compat_msghdr cmsg;
720
721 ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_DEST);
722 if (unlikely(ret))
723 return ret;
724
725 ret = __get_compat_msghdr(&iomsg->msg, &cmsg, &iomsg->uaddr);
726 if (unlikely(ret))
727 return ret;
728
729 return io_recvmsg_mshot_prep(req, iomsg, cmsg.msg_namelen,
730 cmsg.msg_controllen);
731 }
732 #endif
733
734 ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_DEST);
735 if (unlikely(ret))
736 return ret;
737
738 ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
739 if (unlikely(ret))
740 return ret;
741
742 return io_recvmsg_mshot_prep(req, iomsg, msg.msg_namelen,
743 msg.msg_controllen);
744 }
745
io_recvmsg_prep_setup(struct io_kiocb * req)746 static int io_recvmsg_prep_setup(struct io_kiocb *req)
747 {
748 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
749 struct io_async_msghdr *kmsg;
750 int ret;
751
752 kmsg = io_msg_alloc_async(req);
753 if (unlikely(!kmsg))
754 return -ENOMEM;
755
756 if (req->opcode == IORING_OP_RECV) {
757 kmsg->msg.msg_name = NULL;
758 kmsg->msg.msg_namelen = 0;
759 kmsg->msg.msg_inq = 0;
760 kmsg->msg.msg_control = NULL;
761 kmsg->msg.msg_get_inq = 1;
762 kmsg->msg.msg_controllen = 0;
763 kmsg->msg.msg_iocb = NULL;
764 kmsg->msg.msg_ubuf = NULL;
765
766 if (!io_do_buffer_select(req)) {
767 ret = import_ubuf(ITER_DEST, sr->buf, sr->len,
768 &kmsg->msg.msg_iter);
769 if (unlikely(ret))
770 return ret;
771 }
772 return 0;
773 }
774
775 ret = io_recvmsg_copy_hdr(req, kmsg);
776 if (!ret)
777 req->flags |= REQ_F_NEED_CLEANUP;
778 return ret;
779 }
780
781 #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT | \
782 IORING_RECVSEND_BUNDLE)
783
io_recvmsg_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)784 int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
785 {
786 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
787
788 sr->done_io = 0;
789
790 if (unlikely(sqe->file_index || sqe->addr2))
791 return -EINVAL;
792
793 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
794 sr->len = READ_ONCE(sqe->len);
795 sr->flags = READ_ONCE(sqe->ioprio);
796 if (sr->flags & ~RECVMSG_FLAGS)
797 return -EINVAL;
798 sr->msg_flags = READ_ONCE(sqe->msg_flags);
799 if (sr->msg_flags & MSG_DONTWAIT)
800 req->flags |= REQ_F_NOWAIT;
801 if (sr->msg_flags & MSG_ERRQUEUE)
802 req->flags |= REQ_F_CLEAR_POLLIN;
803 if (req->flags & REQ_F_BUFFER_SELECT) {
804 /*
805 * Store the buffer group for this multishot receive separately,
806 * as if we end up doing an io-wq based issue that selects a
807 * buffer, it has to be committed immediately and that will
808 * clear ->buf_list. This means we lose the link to the buffer
809 * list, and the eventual buffer put on completion then cannot
810 * restore it.
811 */
812 sr->buf_group = req->buf_index;
813 req->buf_list = NULL;
814 }
815 if (sr->flags & IORING_RECV_MULTISHOT) {
816 if (!(req->flags & REQ_F_BUFFER_SELECT))
817 return -EINVAL;
818 if (sr->msg_flags & MSG_WAITALL)
819 return -EINVAL;
820 if (req->opcode == IORING_OP_RECV && sr->len)
821 return -EINVAL;
822 req->flags |= REQ_F_APOLL_MULTISHOT;
823 }
824 if (sr->flags & IORING_RECVSEND_BUNDLE) {
825 if (req->opcode == IORING_OP_RECVMSG)
826 return -EINVAL;
827 }
828
829 #ifdef CONFIG_COMPAT
830 if (req->ctx->compat)
831 sr->msg_flags |= MSG_CMSG_COMPAT;
832 #endif
833 sr->nr_multishot_loops = 0;
834 return io_recvmsg_prep_setup(req);
835 }
836
837 /*
838 * Finishes io_recv and io_recvmsg.
839 *
840 * Returns true if it is actually finished, or false if it should run
841 * again (for multishot).
842 */
io_recv_finish(struct io_kiocb * req,int * ret,struct io_async_msghdr * kmsg,bool mshot_finished,unsigned issue_flags)843 static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
844 struct io_async_msghdr *kmsg,
845 bool mshot_finished, unsigned issue_flags)
846 {
847 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
848 unsigned int cflags = 0;
849
850 if (kmsg->msg.msg_inq > 0)
851 cflags |= IORING_CQE_F_SOCK_NONEMPTY;
852
853 if (sr->flags & IORING_RECVSEND_BUNDLE) {
854 cflags |= io_put_kbufs(req, *ret, io_bundle_nbufs(kmsg, *ret),
855 issue_flags);
856 /* bundle with no more immediate buffers, we're done */
857 if (req->flags & REQ_F_BL_EMPTY)
858 goto finish;
859 } else {
860 cflags |= io_put_kbuf(req, *ret, issue_flags);
861 }
862
863 /*
864 * Fill CQE for this receive and see if we should keep trying to
865 * receive from this socket.
866 */
867 if ((req->flags & REQ_F_APOLL_MULTISHOT) && !mshot_finished &&
868 io_req_post_cqe(req, *ret, cflags | IORING_CQE_F_MORE)) {
869 int mshot_retry_ret = IOU_ISSUE_SKIP_COMPLETE;
870
871 io_mshot_prep_retry(req, kmsg);
872 /* Known not-empty or unknown state, retry */
873 if (cflags & IORING_CQE_F_SOCK_NONEMPTY || kmsg->msg.msg_inq < 0) {
874 if (sr->nr_multishot_loops++ < MULTISHOT_MAX_RETRY)
875 return false;
876 /* mshot retries exceeded, force a requeue */
877 sr->nr_multishot_loops = 0;
878 mshot_retry_ret = IOU_REQUEUE;
879 }
880 if (issue_flags & IO_URING_F_MULTISHOT)
881 *ret = mshot_retry_ret;
882 else
883 *ret = -EAGAIN;
884 return true;
885 }
886
887 /* Finish the request / stop multishot. */
888 finish:
889 io_req_set_res(req, *ret, cflags);
890
891 if (issue_flags & IO_URING_F_MULTISHOT)
892 *ret = IOU_STOP_MULTISHOT;
893 else
894 *ret = IOU_OK;
895 io_req_msg_cleanup(req, issue_flags);
896 return true;
897 }
898
io_recvmsg_prep_multishot(struct io_async_msghdr * kmsg,struct io_sr_msg * sr,void __user ** buf,size_t * len)899 static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg,
900 struct io_sr_msg *sr, void __user **buf,
901 size_t *len)
902 {
903 unsigned long ubuf = (unsigned long) *buf;
904 unsigned long hdr;
905
906 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
907 kmsg->controllen;
908 if (*len < hdr)
909 return -EFAULT;
910
911 if (kmsg->controllen) {
912 unsigned long control = ubuf + hdr - kmsg->controllen;
913
914 kmsg->msg.msg_control_user = (void __user *) control;
915 kmsg->msg.msg_controllen = kmsg->controllen;
916 }
917
918 sr->buf = *buf; /* stash for later copy */
919 *buf = (void __user *) (ubuf + hdr);
920 kmsg->payloadlen = *len = *len - hdr;
921 return 0;
922 }
923
924 struct io_recvmsg_multishot_hdr {
925 struct io_uring_recvmsg_out msg;
926 struct sockaddr_storage addr;
927 };
928
io_recvmsg_multishot(struct socket * sock,struct io_sr_msg * io,struct io_async_msghdr * kmsg,unsigned int flags,bool * finished)929 static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io,
930 struct io_async_msghdr *kmsg,
931 unsigned int flags, bool *finished)
932 {
933 int err;
934 int copy_len;
935 struct io_recvmsg_multishot_hdr hdr;
936
937 if (kmsg->namelen)
938 kmsg->msg.msg_name = &hdr.addr;
939 kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
940 kmsg->msg.msg_namelen = 0;
941
942 if (sock->file->f_flags & O_NONBLOCK)
943 flags |= MSG_DONTWAIT;
944
945 err = sock_recvmsg(sock, &kmsg->msg, flags);
946 *finished = err <= 0;
947 if (err < 0)
948 return err;
949
950 hdr.msg = (struct io_uring_recvmsg_out) {
951 .controllen = kmsg->controllen - kmsg->msg.msg_controllen,
952 .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT
953 };
954
955 hdr.msg.payloadlen = err;
956 if (err > kmsg->payloadlen)
957 err = kmsg->payloadlen;
958
959 copy_len = sizeof(struct io_uring_recvmsg_out);
960 if (kmsg->msg.msg_namelen > kmsg->namelen)
961 copy_len += kmsg->namelen;
962 else
963 copy_len += kmsg->msg.msg_namelen;
964
965 /*
966 * "fromlen shall refer to the value before truncation.."
967 * 1003.1g
968 */
969 hdr.msg.namelen = kmsg->msg.msg_namelen;
970
971 /* ensure that there is no gap between hdr and sockaddr_storage */
972 BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) !=
973 sizeof(struct io_uring_recvmsg_out));
974 if (copy_to_user(io->buf, &hdr, copy_len)) {
975 *finished = true;
976 return -EFAULT;
977 }
978
979 return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
980 kmsg->controllen + err;
981 }
982
io_recvmsg(struct io_kiocb * req,unsigned int issue_flags)983 int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
984 {
985 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
986 struct io_async_msghdr *kmsg = req->async_data;
987 struct socket *sock;
988 unsigned flags;
989 int ret, min_ret = 0;
990 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
991 bool mshot_finished = true;
992
993 sock = sock_from_file(req->file);
994 if (unlikely(!sock))
995 return -ENOTSOCK;
996
997 if (!(req->flags & REQ_F_POLLED) &&
998 (sr->flags & IORING_RECVSEND_POLL_FIRST))
999 return -EAGAIN;
1000
1001 flags = sr->msg_flags;
1002 if (force_nonblock)
1003 flags |= MSG_DONTWAIT;
1004
1005 retry_multishot:
1006 if (io_do_buffer_select(req)) {
1007 void __user *buf;
1008 size_t len = sr->len;
1009
1010 buf = io_buffer_select(req, &len, issue_flags);
1011 if (!buf)
1012 return -ENOBUFS;
1013
1014 if (req->flags & REQ_F_APOLL_MULTISHOT) {
1015 ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len);
1016 if (ret) {
1017 io_kbuf_recycle(req, issue_flags);
1018 return ret;
1019 }
1020 }
1021
1022 iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len);
1023 }
1024
1025 kmsg->msg.msg_get_inq = 1;
1026 kmsg->msg.msg_inq = -1;
1027 if (req->flags & REQ_F_APOLL_MULTISHOT) {
1028 ret = io_recvmsg_multishot(sock, sr, kmsg, flags,
1029 &mshot_finished);
1030 } else {
1031 /* disable partial retry for recvmsg with cmsg attached */
1032 if (flags & MSG_WAITALL && !kmsg->msg.msg_controllen)
1033 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
1034
1035 ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg,
1036 kmsg->uaddr, flags);
1037 }
1038
1039 if (ret < min_ret) {
1040 if (ret == -EAGAIN && force_nonblock) {
1041 if (issue_flags & IO_URING_F_MULTISHOT) {
1042 io_kbuf_recycle(req, issue_flags);
1043 return IOU_ISSUE_SKIP_COMPLETE;
1044 }
1045 return -EAGAIN;
1046 }
1047 if (ret > 0 && io_net_retry(sock, flags)) {
1048 sr->done_io += ret;
1049 req->flags |= REQ_F_BL_NO_RECYCLE;
1050 return -EAGAIN;
1051 }
1052 if (ret == -ERESTARTSYS)
1053 ret = -EINTR;
1054 req_set_fail(req);
1055 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
1056 req_set_fail(req);
1057 }
1058
1059 if (ret > 0)
1060 ret += sr->done_io;
1061 else if (sr->done_io)
1062 ret = sr->done_io;
1063 else
1064 io_kbuf_recycle(req, issue_flags);
1065
1066 if (!io_recv_finish(req, &ret, kmsg, mshot_finished, issue_flags))
1067 goto retry_multishot;
1068
1069 return ret;
1070 }
1071
io_recv_buf_select(struct io_kiocb * req,struct io_async_msghdr * kmsg,size_t * len,unsigned int issue_flags)1072 static int io_recv_buf_select(struct io_kiocb *req, struct io_async_msghdr *kmsg,
1073 size_t *len, unsigned int issue_flags)
1074 {
1075 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
1076 int ret;
1077
1078 /*
1079 * If the ring isn't locked, then don't use the peek interface
1080 * to grab multiple buffers as we will lock/unlock between
1081 * this selection and posting the buffers.
1082 */
1083 if (!(issue_flags & IO_URING_F_UNLOCKED) &&
1084 sr->flags & IORING_RECVSEND_BUNDLE) {
1085 struct buf_sel_arg arg = {
1086 .iovs = &kmsg->fast_iov,
1087 .nr_iovs = 1,
1088 .mode = KBUF_MODE_EXPAND,
1089 };
1090
1091 if (kmsg->free_iov) {
1092 arg.nr_iovs = kmsg->free_iov_nr;
1093 arg.iovs = kmsg->free_iov;
1094 arg.mode |= KBUF_MODE_FREE;
1095 }
1096
1097 if (kmsg->msg.msg_inq > 0)
1098 arg.max_len = min_not_zero(sr->len, kmsg->msg.msg_inq);
1099
1100 ret = io_buffers_peek(req, &arg);
1101 if (unlikely(ret < 0))
1102 return ret;
1103
1104 /* special case 1 vec, can be a fast path */
1105 if (ret == 1) {
1106 sr->buf = arg.iovs[0].iov_base;
1107 sr->len = arg.iovs[0].iov_len;
1108 goto map_ubuf;
1109 }
1110 iov_iter_init(&kmsg->msg.msg_iter, ITER_DEST, arg.iovs, ret,
1111 arg.out_len);
1112 if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
1113 kmsg->free_iov_nr = ret;
1114 kmsg->free_iov = arg.iovs;
1115 req->flags |= REQ_F_NEED_CLEANUP;
1116 }
1117 } else {
1118 void __user *buf;
1119
1120 *len = sr->len;
1121 buf = io_buffer_select(req, len, issue_flags);
1122 if (!buf)
1123 return -ENOBUFS;
1124 sr->buf = buf;
1125 sr->len = *len;
1126 map_ubuf:
1127 ret = import_ubuf(ITER_DEST, sr->buf, sr->len,
1128 &kmsg->msg.msg_iter);
1129 if (unlikely(ret))
1130 return ret;
1131 }
1132
1133 return 0;
1134 }
1135
io_recv(struct io_kiocb * req,unsigned int issue_flags)1136 int io_recv(struct io_kiocb *req, unsigned int issue_flags)
1137 {
1138 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
1139 struct io_async_msghdr *kmsg = req->async_data;
1140 struct socket *sock;
1141 unsigned flags;
1142 int ret, min_ret = 0;
1143 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1144 size_t len = sr->len;
1145 bool mshot_finished;
1146
1147 if (!(req->flags & REQ_F_POLLED) &&
1148 (sr->flags & IORING_RECVSEND_POLL_FIRST))
1149 return -EAGAIN;
1150
1151 sock = sock_from_file(req->file);
1152 if (unlikely(!sock))
1153 return -ENOTSOCK;
1154
1155 flags = sr->msg_flags;
1156 if (force_nonblock)
1157 flags |= MSG_DONTWAIT;
1158
1159 retry_multishot:
1160 if (io_do_buffer_select(req)) {
1161 ret = io_recv_buf_select(req, kmsg, &len, issue_flags);
1162 if (unlikely(ret)) {
1163 kmsg->msg.msg_inq = -1;
1164 goto out_free;
1165 }
1166 sr->buf = NULL;
1167 }
1168
1169 kmsg->msg.msg_flags = 0;
1170 kmsg->msg.msg_inq = -1;
1171
1172 if (flags & MSG_WAITALL)
1173 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
1174
1175 ret = sock_recvmsg(sock, &kmsg->msg, flags);
1176 if (ret < min_ret) {
1177 if (ret == -EAGAIN && force_nonblock) {
1178 if (issue_flags & IO_URING_F_MULTISHOT) {
1179 io_kbuf_recycle(req, issue_flags);
1180 return IOU_ISSUE_SKIP_COMPLETE;
1181 }
1182
1183 return -EAGAIN;
1184 }
1185 if (ret > 0 && io_net_retry(sock, flags)) {
1186 sr->len -= ret;
1187 sr->buf += ret;
1188 sr->done_io += ret;
1189 req->flags |= REQ_F_BL_NO_RECYCLE;
1190 return -EAGAIN;
1191 }
1192 if (ret == -ERESTARTSYS)
1193 ret = -EINTR;
1194 req_set_fail(req);
1195 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
1196 out_free:
1197 req_set_fail(req);
1198 }
1199
1200 mshot_finished = ret <= 0;
1201 if (ret > 0)
1202 ret += sr->done_io;
1203 else if (sr->done_io)
1204 ret = sr->done_io;
1205 else
1206 io_kbuf_recycle(req, issue_flags);
1207
1208 if (!io_recv_finish(req, &ret, kmsg, mshot_finished, issue_flags))
1209 goto retry_multishot;
1210
1211 return ret;
1212 }
1213
io_send_zc_cleanup(struct io_kiocb * req)1214 void io_send_zc_cleanup(struct io_kiocb *req)
1215 {
1216 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
1217 struct io_async_msghdr *io = req->async_data;
1218
1219 if (req_has_async_data(req))
1220 io_netmsg_iovec_free(io);
1221 if (zc->notif) {
1222 io_notif_flush(zc->notif);
1223 zc->notif = NULL;
1224 }
1225 }
1226
1227 #define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF)
1228 #define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE)
1229
io_send_zc_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)1230 int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1231 {
1232 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
1233 struct io_ring_ctx *ctx = req->ctx;
1234 struct io_kiocb *notif;
1235
1236 zc->done_io = 0;
1237 req->flags |= REQ_F_POLL_NO_LAZY;
1238
1239 if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)))
1240 return -EINVAL;
1241 /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */
1242 if (req->flags & REQ_F_CQE_SKIP)
1243 return -EINVAL;
1244
1245 notif = zc->notif = io_alloc_notif(ctx);
1246 if (!notif)
1247 return -ENOMEM;
1248 notif->cqe.user_data = req->cqe.user_data;
1249 notif->cqe.res = 0;
1250 notif->cqe.flags = IORING_CQE_F_NOTIF;
1251 req->flags |= REQ_F_NEED_CLEANUP;
1252
1253 zc->flags = READ_ONCE(sqe->ioprio);
1254 if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) {
1255 if (zc->flags & ~IO_ZC_FLAGS_VALID)
1256 return -EINVAL;
1257 if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) {
1258 struct io_notif_data *nd = io_notif_to_data(notif);
1259
1260 nd->zc_report = true;
1261 nd->zc_used = false;
1262 nd->zc_copied = false;
1263 }
1264 }
1265
1266 if (req->opcode != IORING_OP_SEND_ZC) {
1267 if (unlikely(sqe->addr2 || sqe->file_index))
1268 return -EINVAL;
1269 if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF))
1270 return -EINVAL;
1271 }
1272
1273 zc->len = READ_ONCE(sqe->len);
1274 zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL | MSG_ZEROCOPY;
1275 zc->buf_index = READ_ONCE(sqe->buf_index);
1276 if (zc->msg_flags & MSG_DONTWAIT)
1277 req->flags |= REQ_F_NOWAIT;
1278
1279 #ifdef CONFIG_COMPAT
1280 if (req->ctx->compat)
1281 zc->msg_flags |= MSG_CMSG_COMPAT;
1282 #endif
1283 if (unlikely(!io_msg_alloc_async(req)))
1284 return -ENOMEM;
1285 if (req->opcode != IORING_OP_SENDMSG_ZC)
1286 return io_send_setup(req, sqe);
1287 return io_sendmsg_setup(req, sqe);
1288 }
1289
io_sg_from_iter_iovec(struct sk_buff * skb,struct iov_iter * from,size_t length)1290 static int io_sg_from_iter_iovec(struct sk_buff *skb,
1291 struct iov_iter *from, size_t length)
1292 {
1293 skb_zcopy_downgrade_managed(skb);
1294 return zerocopy_fill_skb_from_iter(skb, from, length);
1295 }
1296
io_sg_from_iter(struct sk_buff * skb,struct iov_iter * from,size_t length)1297 static int io_sg_from_iter(struct sk_buff *skb,
1298 struct iov_iter *from, size_t length)
1299 {
1300 struct skb_shared_info *shinfo = skb_shinfo(skb);
1301 int frag = shinfo->nr_frags;
1302 int ret = 0;
1303 struct bvec_iter bi;
1304 ssize_t copied = 0;
1305 unsigned long truesize = 0;
1306
1307 if (!frag)
1308 shinfo->flags |= SKBFL_MANAGED_FRAG_REFS;
1309 else if (unlikely(!skb_zcopy_managed(skb)))
1310 return zerocopy_fill_skb_from_iter(skb, from, length);
1311
1312 bi.bi_size = min(from->count, length);
1313 bi.bi_bvec_done = from->iov_offset;
1314 bi.bi_idx = 0;
1315
1316 while (bi.bi_size && frag < MAX_SKB_FRAGS) {
1317 struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi);
1318
1319 copied += v.bv_len;
1320 truesize += PAGE_ALIGN(v.bv_len + v.bv_offset);
1321 __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page,
1322 v.bv_offset, v.bv_len);
1323 bvec_iter_advance_single(from->bvec, &bi, v.bv_len);
1324 }
1325 if (bi.bi_size)
1326 ret = -EMSGSIZE;
1327
1328 shinfo->nr_frags = frag;
1329 from->bvec += bi.bi_idx;
1330 from->nr_segs -= bi.bi_idx;
1331 from->count -= copied;
1332 from->iov_offset = bi.bi_bvec_done;
1333
1334 skb->data_len += copied;
1335 skb->len += copied;
1336 skb->truesize += truesize;
1337 return ret;
1338 }
1339
io_send_zc_import(struct io_kiocb * req,unsigned int issue_flags)1340 static int io_send_zc_import(struct io_kiocb *req, unsigned int issue_flags)
1341 {
1342 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
1343 struct io_async_msghdr *kmsg = req->async_data;
1344 int ret;
1345
1346 if (sr->flags & IORING_RECVSEND_FIXED_BUF) {
1347 struct io_ring_ctx *ctx = req->ctx;
1348 struct io_rsrc_node *node;
1349
1350 ret = -EFAULT;
1351 io_ring_submit_lock(ctx, issue_flags);
1352 node = io_rsrc_node_lookup(&ctx->buf_table, sr->buf_index);
1353 if (node) {
1354 io_req_assign_buf_node(sr->notif, node);
1355 ret = 0;
1356 }
1357 io_ring_submit_unlock(ctx, issue_flags);
1358
1359 if (unlikely(ret))
1360 return ret;
1361
1362 ret = io_import_fixed(ITER_SOURCE, &kmsg->msg.msg_iter,
1363 node->buf, (u64)(uintptr_t)sr->buf,
1364 sr->len);
1365 if (unlikely(ret))
1366 return ret;
1367 kmsg->msg.sg_from_iter = io_sg_from_iter;
1368 } else {
1369 ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &kmsg->msg.msg_iter);
1370 if (unlikely(ret))
1371 return ret;
1372 ret = io_notif_account_mem(sr->notif, sr->len);
1373 if (unlikely(ret))
1374 return ret;
1375 kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
1376 }
1377
1378 return ret;
1379 }
1380
io_send_zc(struct io_kiocb * req,unsigned int issue_flags)1381 int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
1382 {
1383 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
1384 struct io_async_msghdr *kmsg = req->async_data;
1385 struct socket *sock;
1386 unsigned msg_flags;
1387 int ret, min_ret = 0;
1388
1389 sock = sock_from_file(req->file);
1390 if (unlikely(!sock))
1391 return -ENOTSOCK;
1392 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
1393 return -EOPNOTSUPP;
1394
1395 if (!(req->flags & REQ_F_POLLED) &&
1396 (zc->flags & IORING_RECVSEND_POLL_FIRST))
1397 return -EAGAIN;
1398
1399 if (!zc->done_io) {
1400 ret = io_send_zc_import(req, issue_flags);
1401 if (unlikely(ret))
1402 return ret;
1403 }
1404
1405 msg_flags = zc->msg_flags;
1406 if (issue_flags & IO_URING_F_NONBLOCK)
1407 msg_flags |= MSG_DONTWAIT;
1408 if (msg_flags & MSG_WAITALL)
1409 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
1410 msg_flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
1411
1412 kmsg->msg.msg_flags = msg_flags;
1413 kmsg->msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg;
1414 ret = sock_sendmsg(sock, &kmsg->msg);
1415
1416 if (unlikely(ret < min_ret)) {
1417 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1418 return -EAGAIN;
1419
1420 if (ret > 0 && io_net_retry(sock, kmsg->msg.msg_flags)) {
1421 zc->len -= ret;
1422 zc->buf += ret;
1423 zc->done_io += ret;
1424 req->flags |= REQ_F_BL_NO_RECYCLE;
1425 return -EAGAIN;
1426 }
1427 if (ret == -ERESTARTSYS)
1428 ret = -EINTR;
1429 req_set_fail(req);
1430 }
1431
1432 if (ret >= 0)
1433 ret += zc->done_io;
1434 else if (zc->done_io)
1435 ret = zc->done_io;
1436
1437 /*
1438 * If we're in io-wq we can't rely on tw ordering guarantees, defer
1439 * flushing notif to io_send_zc_cleanup()
1440 */
1441 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
1442 io_notif_flush(zc->notif);
1443 zc->notif = NULL;
1444 io_req_msg_cleanup(req, 0);
1445 }
1446 io_req_set_res(req, ret, IORING_CQE_F_MORE);
1447 return IOU_OK;
1448 }
1449
io_sendmsg_zc(struct io_kiocb * req,unsigned int issue_flags)1450 int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
1451 {
1452 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
1453 struct io_async_msghdr *kmsg = req->async_data;
1454 struct socket *sock;
1455 unsigned flags;
1456 int ret, min_ret = 0;
1457
1458 sock = sock_from_file(req->file);
1459 if (unlikely(!sock))
1460 return -ENOTSOCK;
1461 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
1462 return -EOPNOTSUPP;
1463
1464 if (!(req->flags & REQ_F_POLLED) &&
1465 (sr->flags & IORING_RECVSEND_POLL_FIRST))
1466 return -EAGAIN;
1467
1468 flags = sr->msg_flags;
1469 if (issue_flags & IO_URING_F_NONBLOCK)
1470 flags |= MSG_DONTWAIT;
1471 if (flags & MSG_WAITALL)
1472 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
1473
1474 kmsg->msg.msg_control_user = sr->msg_control;
1475 kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg;
1476 kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
1477 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
1478
1479 if (unlikely(ret < min_ret)) {
1480 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1481 return -EAGAIN;
1482
1483 if (ret > 0 && io_net_retry(sock, flags)) {
1484 sr->done_io += ret;
1485 req->flags |= REQ_F_BL_NO_RECYCLE;
1486 return -EAGAIN;
1487 }
1488 if (ret == -ERESTARTSYS)
1489 ret = -EINTR;
1490 req_set_fail(req);
1491 }
1492
1493 if (ret >= 0)
1494 ret += sr->done_io;
1495 else if (sr->done_io)
1496 ret = sr->done_io;
1497
1498 /*
1499 * If we're in io-wq we can't rely on tw ordering guarantees, defer
1500 * flushing notif to io_send_zc_cleanup()
1501 */
1502 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
1503 io_notif_flush(sr->notif);
1504 sr->notif = NULL;
1505 io_req_msg_cleanup(req, 0);
1506 }
1507 io_req_set_res(req, ret, IORING_CQE_F_MORE);
1508 return IOU_OK;
1509 }
1510
io_sendrecv_fail(struct io_kiocb * req)1511 void io_sendrecv_fail(struct io_kiocb *req)
1512 {
1513 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
1514
1515 if (sr->done_io)
1516 req->cqe.res = sr->done_io;
1517
1518 if ((req->flags & REQ_F_NEED_CLEANUP) &&
1519 (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC))
1520 req->cqe.flags |= IORING_CQE_F_MORE;
1521 }
1522
1523 #define ACCEPT_FLAGS (IORING_ACCEPT_MULTISHOT | IORING_ACCEPT_DONTWAIT | \
1524 IORING_ACCEPT_POLL_FIRST)
1525
io_accept_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)1526 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1527 {
1528 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
1529
1530 if (sqe->len || sqe->buf_index)
1531 return -EINVAL;
1532
1533 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1534 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
1535 accept->flags = READ_ONCE(sqe->accept_flags);
1536 accept->nofile = rlimit(RLIMIT_NOFILE);
1537 accept->iou_flags = READ_ONCE(sqe->ioprio);
1538 if (accept->iou_flags & ~ACCEPT_FLAGS)
1539 return -EINVAL;
1540
1541 accept->file_slot = READ_ONCE(sqe->file_index);
1542 if (accept->file_slot) {
1543 if (accept->flags & SOCK_CLOEXEC)
1544 return -EINVAL;
1545 if (accept->iou_flags & IORING_ACCEPT_MULTISHOT &&
1546 accept->file_slot != IORING_FILE_INDEX_ALLOC)
1547 return -EINVAL;
1548 }
1549 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1550 return -EINVAL;
1551 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
1552 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1553 if (accept->iou_flags & IORING_ACCEPT_MULTISHOT)
1554 req->flags |= REQ_F_APOLL_MULTISHOT;
1555 if (accept->iou_flags & IORING_ACCEPT_DONTWAIT)
1556 req->flags |= REQ_F_NOWAIT;
1557 return 0;
1558 }
1559
io_accept(struct io_kiocb * req,unsigned int issue_flags)1560 int io_accept(struct io_kiocb *req, unsigned int issue_flags)
1561 {
1562 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
1563 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1564 bool fixed = !!accept->file_slot;
1565 struct proto_accept_arg arg = {
1566 .flags = force_nonblock ? O_NONBLOCK : 0,
1567 };
1568 struct file *file;
1569 unsigned cflags;
1570 int ret, fd;
1571
1572 if (!(req->flags & REQ_F_POLLED) &&
1573 accept->iou_flags & IORING_ACCEPT_POLL_FIRST)
1574 return -EAGAIN;
1575
1576 retry:
1577 if (!fixed) {
1578 fd = __get_unused_fd_flags(accept->flags, accept->nofile);
1579 if (unlikely(fd < 0))
1580 return fd;
1581 }
1582 arg.err = 0;
1583 arg.is_empty = -1;
1584 file = do_accept(req->file, &arg, accept->addr, accept->addr_len,
1585 accept->flags);
1586 if (IS_ERR(file)) {
1587 if (!fixed)
1588 put_unused_fd(fd);
1589 ret = PTR_ERR(file);
1590 if (ret == -EAGAIN && force_nonblock &&
1591 !(accept->iou_flags & IORING_ACCEPT_DONTWAIT)) {
1592 /*
1593 * if it's multishot and polled, we don't need to
1594 * return EAGAIN to arm the poll infra since it
1595 * has already been done
1596 */
1597 if (issue_flags & IO_URING_F_MULTISHOT)
1598 return IOU_ISSUE_SKIP_COMPLETE;
1599 return ret;
1600 }
1601 if (ret == -ERESTARTSYS)
1602 ret = -EINTR;
1603 req_set_fail(req);
1604 } else if (!fixed) {
1605 fd_install(fd, file);
1606 ret = fd;
1607 } else {
1608 ret = io_fixed_fd_install(req, issue_flags, file,
1609 accept->file_slot);
1610 }
1611
1612 cflags = 0;
1613 if (!arg.is_empty)
1614 cflags |= IORING_CQE_F_SOCK_NONEMPTY;
1615
1616 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
1617 io_req_set_res(req, ret, cflags);
1618 return IOU_OK;
1619 }
1620
1621 if (ret < 0)
1622 return ret;
1623 if (io_req_post_cqe(req, ret, cflags | IORING_CQE_F_MORE)) {
1624 if (cflags & IORING_CQE_F_SOCK_NONEMPTY || arg.is_empty == -1)
1625 goto retry;
1626 if (issue_flags & IO_URING_F_MULTISHOT)
1627 return IOU_ISSUE_SKIP_COMPLETE;
1628 return -EAGAIN;
1629 }
1630
1631 io_req_set_res(req, ret, cflags);
1632 return IOU_STOP_MULTISHOT;
1633 }
1634
io_socket_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)1635 int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1636 {
1637 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
1638
1639 if (sqe->addr || sqe->rw_flags || sqe->buf_index)
1640 return -EINVAL;
1641
1642 sock->domain = READ_ONCE(sqe->fd);
1643 sock->type = READ_ONCE(sqe->off);
1644 sock->protocol = READ_ONCE(sqe->len);
1645 sock->file_slot = READ_ONCE(sqe->file_index);
1646 sock->nofile = rlimit(RLIMIT_NOFILE);
1647
1648 sock->flags = sock->type & ~SOCK_TYPE_MASK;
1649 if (sock->file_slot && (sock->flags & SOCK_CLOEXEC))
1650 return -EINVAL;
1651 if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1652 return -EINVAL;
1653 return 0;
1654 }
1655
io_socket(struct io_kiocb * req,unsigned int issue_flags)1656 int io_socket(struct io_kiocb *req, unsigned int issue_flags)
1657 {
1658 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
1659 bool fixed = !!sock->file_slot;
1660 struct file *file;
1661 int ret, fd;
1662
1663 if (!fixed) {
1664 fd = __get_unused_fd_flags(sock->flags, sock->nofile);
1665 if (unlikely(fd < 0))
1666 return fd;
1667 }
1668 file = __sys_socket_file(sock->domain, sock->type, sock->protocol);
1669 if (IS_ERR(file)) {
1670 if (!fixed)
1671 put_unused_fd(fd);
1672 ret = PTR_ERR(file);
1673 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1674 return -EAGAIN;
1675 if (ret == -ERESTARTSYS)
1676 ret = -EINTR;
1677 req_set_fail(req);
1678 } else if (!fixed) {
1679 fd_install(fd, file);
1680 ret = fd;
1681 } else {
1682 ret = io_fixed_fd_install(req, issue_flags, file,
1683 sock->file_slot);
1684 }
1685 io_req_set_res(req, ret, 0);
1686 return IOU_OK;
1687 }
1688
io_connect_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)1689 int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1690 {
1691 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
1692 struct io_async_msghdr *io;
1693
1694 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
1695 return -EINVAL;
1696
1697 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1698 conn->addr_len = READ_ONCE(sqe->addr2);
1699 conn->in_progress = conn->seen_econnaborted = false;
1700
1701 io = io_msg_alloc_async(req);
1702 if (unlikely(!io))
1703 return -ENOMEM;
1704
1705 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->addr);
1706 }
1707
io_connect(struct io_kiocb * req,unsigned int issue_flags)1708 int io_connect(struct io_kiocb *req, unsigned int issue_flags)
1709 {
1710 struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect);
1711 struct io_async_msghdr *io = req->async_data;
1712 unsigned file_flags;
1713 int ret;
1714 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1715
1716 if (unlikely(req->flags & REQ_F_FAIL)) {
1717 ret = -ECONNRESET;
1718 goto out;
1719 }
1720
1721 file_flags = force_nonblock ? O_NONBLOCK : 0;
1722
1723 ret = __sys_connect_file(req->file, &io->addr, connect->addr_len,
1724 file_flags);
1725 if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED)
1726 && force_nonblock) {
1727 if (ret == -EINPROGRESS) {
1728 connect->in_progress = true;
1729 } else if (ret == -ECONNABORTED) {
1730 if (connect->seen_econnaborted)
1731 goto out;
1732 connect->seen_econnaborted = true;
1733 }
1734 return -EAGAIN;
1735 }
1736 if (connect->in_progress) {
1737 /*
1738 * At least bluetooth will return -EBADFD on a re-connect
1739 * attempt, and it's (supposedly) also valid to get -EISCONN
1740 * which means the previous result is good. For both of these,
1741 * grab the sock_error() and use that for the completion.
1742 */
1743 if (ret == -EBADFD || ret == -EISCONN)
1744 ret = sock_error(sock_from_file(req->file)->sk);
1745 }
1746 if (ret == -ERESTARTSYS)
1747 ret = -EINTR;
1748 out:
1749 if (ret < 0)
1750 req_set_fail(req);
1751 io_req_msg_cleanup(req, issue_flags);
1752 io_req_set_res(req, ret, 0);
1753 return IOU_OK;
1754 }
1755
io_bind_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)1756 int io_bind_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1757 {
1758 struct io_bind *bind = io_kiocb_to_cmd(req, struct io_bind);
1759 struct sockaddr __user *uaddr;
1760 struct io_async_msghdr *io;
1761
1762 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
1763 return -EINVAL;
1764
1765 uaddr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1766 bind->addr_len = READ_ONCE(sqe->addr2);
1767
1768 io = io_msg_alloc_async(req);
1769 if (unlikely(!io))
1770 return -ENOMEM;
1771 return move_addr_to_kernel(uaddr, bind->addr_len, &io->addr);
1772 }
1773
io_bind(struct io_kiocb * req,unsigned int issue_flags)1774 int io_bind(struct io_kiocb *req, unsigned int issue_flags)
1775 {
1776 struct io_bind *bind = io_kiocb_to_cmd(req, struct io_bind);
1777 struct io_async_msghdr *io = req->async_data;
1778 struct socket *sock;
1779 int ret;
1780
1781 sock = sock_from_file(req->file);
1782 if (unlikely(!sock))
1783 return -ENOTSOCK;
1784
1785 ret = __sys_bind_socket(sock, &io->addr, bind->addr_len);
1786 if (ret < 0)
1787 req_set_fail(req);
1788 io_req_set_res(req, ret, 0);
1789 return 0;
1790 }
1791
io_listen_prep(struct io_kiocb * req,const struct io_uring_sqe * sqe)1792 int io_listen_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1793 {
1794 struct io_listen *listen = io_kiocb_to_cmd(req, struct io_listen);
1795
1796 if (sqe->addr || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in || sqe->addr2)
1797 return -EINVAL;
1798
1799 listen->backlog = READ_ONCE(sqe->len);
1800 return 0;
1801 }
1802
io_listen(struct io_kiocb * req,unsigned int issue_flags)1803 int io_listen(struct io_kiocb *req, unsigned int issue_flags)
1804 {
1805 struct io_listen *listen = io_kiocb_to_cmd(req, struct io_listen);
1806 struct socket *sock;
1807 int ret;
1808
1809 sock = sock_from_file(req->file);
1810 if (unlikely(!sock))
1811 return -ENOTSOCK;
1812
1813 ret = __sys_listen_socket(sock, listen->backlog);
1814 if (ret < 0)
1815 req_set_fail(req);
1816 io_req_set_res(req, ret, 0);
1817 return 0;
1818 }
1819
io_netmsg_cache_free(const void * entry)1820 void io_netmsg_cache_free(const void *entry)
1821 {
1822 struct io_async_msghdr *kmsg = (struct io_async_msghdr *) entry;
1823
1824 if (kmsg->free_iov)
1825 io_netmsg_iovec_free(kmsg);
1826 kfree(kmsg);
1827 }
1828 #endif
1829