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net: remove unnecessary includes from net/flow.h
[linux-2.6-block.git] / io_uring / net.c
CommitLineData
f9ead18c
JA		 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
f9ead18c 13#include "io_uring.h"
3b77495a 14#include "kbuf.h"
43e0bbbd 15#include "alloc_cache.h"
f9ead18c 16#include "net.h"
06a5464b 17#include "notif.h"
10c7d33e 18#include "rsrc.h"
f9ead18c
JA		 19
20#if defined(CONFIG_NET)
21struct io_shutdown {
22 struct file *file;
23 int how;
24};
25
26struct 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
35struct 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
45struct io_connect {
46 struct file *file;
47 struct sockaddr __user *addr;
48 int addr_len;
3fb1bd68 49 bool in_progress;
f9ead18c
JA		 50};
51
52struct io_sr_msg {
53 struct file *file;
54 union {
55 struct compat_msghdr __user *umsg_compat;
56 struct user_msghdr __user *umsg;
57 void __user *buf;
58 };
0b048557
PB		 59 unsigned len;
60 unsigned done_io;
293402e5 61 unsigned msg_flags;
0b048557 62 u16 flags;
516e82f0 63 /* initialised and used only by !msg send variants */
0b048557 64 u16 addr_len;
092aeedb 65 void __user *addr;
516e82f0 66 /* used only for send zerocopy */
b48c312b 67 struct io_kiocb *notif;
06a5464b
PB		 68};
69
17add5ce
PB		 70static inline bool io_check_multishot(struct io_kiocb *req,
71 unsigned int issue_flags)
72{
73 /*
74 * When ->locked_cq is set we only allow to post CQEs from the original
75 * task context. Usual request completions will be handled in other
76 * generic paths but multipoll may decide to post extra cqes.
77 */
78 return !(issue_flags & IO_URING_F_IOWQ) ||
79 !(issue_flags & IO_URING_F_MULTISHOT) ||
80 !req->ctx->task_complete;
81}
82
f9ead18c
JA		 83int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
84{
f2ccb5ae 85 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
f9ead18c
JA		 86
87 if (unlikely(sqe->off || sqe->addr || sqe->rw_flags ||
88 sqe->buf_index || sqe->splice_fd_in))
89 return -EINVAL;
90
91 shutdown->how = READ_ONCE(sqe->len);
92 return 0;
93}
94
95int io_shutdown(struct io_kiocb *req, unsigned int issue_flags)
96{
f2ccb5ae 97 struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
f9ead18c
JA		 98 struct socket *sock;
99 int ret;
100
101 if (issue_flags & IO_URING_F_NONBLOCK)
102 return -EAGAIN;
103
104 sock = sock_from_file(req->file);
105 if (unlikely(!sock))
106 return -ENOTSOCK;
107
108 ret = __sys_shutdown_sock(sock, shutdown->how);
109 io_req_set_res(req, ret, 0);
110 return IOU_OK;
111}
112
113static bool io_net_retry(struct socket *sock, int flags)
114{
115 if (!(flags & MSG_WAITALL))
116 return false;
117 return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET;
118}
119
43e0bbbd
JA		 120static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
121{
122 struct io_async_msghdr *hdr = req->async_data;
123
06360426 124 if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED)
43e0bbbd
JA		 125 return;
126
127 /* Let normal cleanup path reap it if we fail adding to the cache */
128 if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) {
129 req->async_data = NULL;
130 req->flags &= ~REQ_F_ASYNC_DATA;
131 }
132}
133
858c293e
PB		 134static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req,
135 unsigned int issue_flags)
43e0bbbd
JA		 136{
137 struct io_ring_ctx *ctx = req->ctx;
138 struct io_cache_entry *entry;
4c17a496 139 struct io_async_msghdr *hdr;
43e0bbbd 140
df730ec2
XL		 141 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
142 entry = io_alloc_cache_get(&ctx->netmsg_cache);
143 if (entry) {
144 hdr = container_of(entry, struct io_async_msghdr, cache);
145 hdr->free_iov = NULL;
146 req->flags |= REQ_F_ASYNC_DATA;
147 req->async_data = hdr;
148 return hdr;
149 }
43e0bbbd
JA		 150 }
151
4c17a496
PB		 152 if (!io_alloc_async_data(req)) {
153 hdr = req->async_data;
154 hdr->free_iov = NULL;
155 return hdr;
156 }
43e0bbbd
JA		 157 return NULL;
158}
159
858c293e
PB		 160static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req)
161{
162 /* ->prep_async is always called from the submission context */
163 return io_msg_alloc_async(req, 0);
164}
165
f9ead18c 166static int io_setup_async_msg(struct io_kiocb *req,
43e0bbbd
JA		 167 struct io_async_msghdr *kmsg,
168 unsigned int issue_flags)
f9ead18c 169{
3f743e9b 170 struct io_async_msghdr *async_msg;
f9ead18c 171
3f743e9b 172 if (req_has_async_data(req))
f9ead18c 173 return -EAGAIN;
858c293e 174 async_msg = io_msg_alloc_async(req, issue_flags);
43e0bbbd 175 if (!async_msg) {
f9ead18c
JA		 176 kfree(kmsg->free_iov);
177 return -ENOMEM;
178 }
f9ead18c
JA		 179 req->flags |= REQ_F_NEED_CLEANUP;
180 memcpy(async_msg, kmsg, sizeof(*kmsg));
6f10ae8a
PB		 181 if (async_msg->msg.msg_name)
182 async_msg->msg.msg_name = &async_msg->addr;
f9ead18c 183 /* if were using fast_iov, set it to the new one */
3e4cb6eb
SM		 184 if (!kmsg->free_iov) {
185 size_t fast_idx = kmsg->msg.msg_iter.iov - kmsg->fast_iov;
186 async_msg->msg.msg_iter.iov = &async_msg->fast_iov[fast_idx];
187 }
f9ead18c
JA		 188
189 return -EAGAIN;
190}
191
192static int io_sendmsg_copy_hdr(struct io_kiocb *req,
193 struct io_async_msghdr *iomsg)
194{
f2ccb5ae 195 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 196
197 iomsg->msg.msg_name = &iomsg->addr;
198 iomsg->free_iov = iomsg->fast_iov;
199 return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags,
200 &iomsg->free_iov);
201}
202
516e82f0 203int io_send_prep_async(struct io_kiocb *req)
581711c4 204{
ac9e5784 205 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
581711c4
PB		 206 struct io_async_msghdr *io;
207 int ret;
208
209 if (!zc->addr || req_has_async_data(req))
210 return 0;
6bf8ad25
PB		 211 io = io_msg_alloc_async_prep(req);
212 if (!io)
581711c4 213 return -ENOMEM;
581711c4
PB		 214 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr);
215 return ret;
216}
217
218static int io_setup_async_addr(struct io_kiocb *req,
6ae61b7a 219 struct sockaddr_storage *addr_storage,
581711c4
PB		 220 unsigned int issue_flags)
221{
6ae61b7a 222 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
581711c4
PB		 223 struct io_async_msghdr *io;
224
6ae61b7a 225 if (!sr->addr || req_has_async_data(req))
581711c4 226 return -EAGAIN;
6bf8ad25
PB		 227 io = io_msg_alloc_async(req, issue_flags);
228 if (!io)
581711c4 229 return -ENOMEM;
6ae61b7a 230 memcpy(&io->addr, addr_storage, sizeof(io->addr));
581711c4
PB		 231 return -EAGAIN;
232}
233
f9ead18c
JA		 234int io_sendmsg_prep_async(struct io_kiocb *req)
235{
236 int ret;
237
858c293e
PB		 238 if (!io_msg_alloc_async_prep(req))
239 return -ENOMEM;
f9ead18c
JA		 240 ret = io_sendmsg_copy_hdr(req, req->async_data);
241 if (!ret)
242 req->flags |= REQ_F_NEED_CLEANUP;
243 return ret;
244}
245
246void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req)
247{
248 struct io_async_msghdr *io = req->async_data;
249
250 kfree(io->free_iov);
251}
252
253int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
254{
f2ccb5ae 255 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c 256
516e82f0
PB		 257 if (req->opcode == IORING_OP_SEND) {
258 if (READ_ONCE(sqe->__pad3[0]))
259 return -EINVAL;
260 sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
261 sr->addr_len = READ_ONCE(sqe->addr_len);
262 } else if (sqe->addr2 || sqe->file_index) {
f9ead18c 263 return -EINVAL;
516e82f0 264 }
f9ead18c
JA		 265
266 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
267 sr->len = READ_ONCE(sqe->len);
268 sr->flags = READ_ONCE(sqe->ioprio);
269 if (sr->flags & ~IORING_RECVSEND_POLL_FIRST)
270 return -EINVAL;
271 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
272 if (sr->msg_flags & MSG_DONTWAIT)
273 req->flags |= REQ_F_NOWAIT;
274
275#ifdef CONFIG_COMPAT
276 if (req->ctx->compat)
277 sr->msg_flags |= MSG_CMSG_COMPAT;
278#endif
279 sr->done_io = 0;
280 return 0;
281}
282
283int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
284{
f2ccb5ae 285 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 286 struct io_async_msghdr iomsg, *kmsg;
287 struct socket *sock;
288 unsigned flags;
289 int min_ret = 0;
290 int ret;
291
292 sock = sock_from_file(req->file);
293 if (unlikely(!sock))
294 return -ENOTSOCK;
295
296 if (req_has_async_data(req)) {
297 kmsg = req->async_data;
298 } else {
299 ret = io_sendmsg_copy_hdr(req, &iomsg);
300 if (ret)
301 return ret;
302 kmsg = &iomsg;
303 }
304
305 if (!(req->flags & REQ_F_POLLED) &&
306 (sr->flags & IORING_RECVSEND_POLL_FIRST))
43e0bbbd 307 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c
JA		 308
309 flags = sr->msg_flags;
310 if (issue_flags & IO_URING_F_NONBLOCK)
311 flags |= MSG_DONTWAIT;
312 if (flags & MSG_WAITALL)
313 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
314
315 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
316
317 if (ret < min_ret) {
318 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
43e0bbbd 319 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c
JA		 320 if (ret > 0 && io_net_retry(sock, flags)) {
321 sr->done_io += ret;
322 req->flags |= REQ_F_PARTIAL_IO;
43e0bbbd 323 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c 324 }
95eafc74
PB		 325 if (ret == -ERESTARTSYS)
326 ret = -EINTR;
f9ead18c
JA		 327 req_set_fail(req);
328 }
329 /* fast path, check for non-NULL to avoid function call */
330 if (kmsg->free_iov)
331 kfree(kmsg->free_iov);
332 req->flags &= ~REQ_F_NEED_CLEANUP;
43e0bbbd 333 io_netmsg_recycle(req, issue_flags);
f9ead18c
JA		 334 if (ret >= 0)
335 ret += sr->done_io;
336 else if (sr->done_io)
337 ret = sr->done_io;
338 io_req_set_res(req, ret, 0);
339 return IOU_OK;
340}
341
342int io_send(struct io_kiocb *req, unsigned int issue_flags)
343{
516e82f0 344 struct sockaddr_storage __address;
f2ccb5ae 345 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 346 struct msghdr msg;
347 struct iovec iov;
348 struct socket *sock;
349 unsigned flags;
350 int min_ret = 0;
351 int ret;
352
04360d3e
PB		 353 msg.msg_name = NULL;
354 msg.msg_control = NULL;
355 msg.msg_controllen = 0;
356 msg.msg_namelen = 0;
357 msg.msg_ubuf = NULL;
358
516e82f0
PB		 359 if (sr->addr) {
360 if (req_has_async_data(req)) {
361 struct io_async_msghdr *io = req->async_data;
362
363 msg.msg_name = &io->addr;
364 } else {
365 ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address);
366 if (unlikely(ret < 0))
367 return ret;
368 msg.msg_name = (struct sockaddr *)&__address;
369 }
370 msg.msg_namelen = sr->addr_len;
371 }
372
f9ead18c
JA		 373 if (!(req->flags & REQ_F_POLLED) &&
374 (sr->flags & IORING_RECVSEND_POLL_FIRST))
516e82f0 375 return io_setup_async_addr(req, &__address, issue_flags);
f9ead18c
JA		 376
377 sock = sock_from_file(req->file);
378 if (unlikely(!sock))
379 return -ENOTSOCK;
380
de4eda9d 381 ret = import_single_range(ITER_SOURCE, sr->buf, sr->len, &iov, &msg.msg_iter);
f9ead18c
JA		 382 if (unlikely(ret))
383 return ret;
384
f9ead18c
JA		 385 flags = sr->msg_flags;
386 if (issue_flags & IO_URING_F_NONBLOCK)
387 flags |= MSG_DONTWAIT;
388 if (flags & MSG_WAITALL)
389 min_ret = iov_iter_count(&msg.msg_iter);
390
391 msg.msg_flags = flags;
392 ret = sock_sendmsg(sock, &msg);
393 if (ret < min_ret) {
394 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
516e82f0
PB		 395 return io_setup_async_addr(req, &__address, issue_flags);
396
f9ead18c
JA		 397 if (ret > 0 && io_net_retry(sock, flags)) {
398 sr->len -= ret;
399 sr->buf += ret;
400 sr->done_io += ret;
401 req->flags |= REQ_F_PARTIAL_IO;
516e82f0 402 return io_setup_async_addr(req, &__address, issue_flags);
f9ead18c 403 }
95eafc74
PB		 404 if (ret == -ERESTARTSYS)
405 ret = -EINTR;
f9ead18c
JA		 406 req_set_fail(req);
407 }
408 if (ret >= 0)
409 ret += sr->done_io;
410 else if (sr->done_io)
411 ret = sr->done_io;
412 io_req_set_res(req, ret, 0);
413 return IOU_OK;
414}
415
9bb66906
DY		 416static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg)
417{
9b0fc3c0 418 int hdr;
9bb66906 419
9b0fc3c0 420 if (iomsg->namelen < 0)
9bb66906 421 return true;
9b0fc3c0
DY		 422 if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out),
423 iomsg->namelen, &hdr))
9bb66906 424 return true;
9b0fc3c0 425 if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr))
9bb66906
DY		 426 return true;
427
428 return false;
429}
430
f9ead18c
JA		 431static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
432 struct io_async_msghdr *iomsg)
433{
f2ccb5ae 434 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
7fa875b8 435 struct user_msghdr msg;
f9ead18c
JA		 436 int ret;
437
7fa875b8
DY		 438 if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg)))
439 return -EFAULT;
440
441 ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
f9ead18c
JA		 442 if (ret)
443 return ret;
444
445 if (req->flags & REQ_F_BUFFER_SELECT) {
7fa875b8 446 if (msg.msg_iovlen == 0) {
5702196e
DY		 447 sr->len = iomsg->fast_iov[0].iov_len = 0;
448 iomsg->fast_iov[0].iov_base = NULL;
449 iomsg->free_iov = NULL;
7fa875b8 450 } else if (msg.msg_iovlen > 1) {
f9ead18c 451 return -EINVAL;
5702196e 452 } else {
7fa875b8 453 if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov)))
5702196e
DY		 454 return -EFAULT;
455 sr->len = iomsg->fast_iov[0].iov_len;
456 iomsg->free_iov = NULL;
457 }
9bb66906
DY		 458
459 if (req->flags & REQ_F_APOLL_MULTISHOT) {
460 iomsg->namelen = msg.msg_namelen;
461 iomsg->controllen = msg.msg_controllen;
462 if (io_recvmsg_multishot_overflow(iomsg))
463 return -EOVERFLOW;
464 }
f9ead18c
JA		 465 } else {
466 iomsg->free_iov = iomsg->fast_iov;
de4eda9d 467 ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV,
f9ead18c
JA		 468 &iomsg->free_iov, &iomsg->msg.msg_iter,
469 false);
470 if (ret > 0)
471 ret = 0;
472 }
473
474 return ret;
475}
476
477#ifdef CONFIG_COMPAT
478static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
479 struct io_async_msghdr *iomsg)
480{
f2ccb5ae 481 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
72c531f8 482 struct compat_msghdr msg;
f9ead18c 483 struct compat_iovec __user *uiov;
f9ead18c
JA		 484 int ret;
485
72c531f8
DY		 486 if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg)))
487 return -EFAULT;
488
4f6a94d3 489 ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
f9ead18c
JA		 490 if (ret)
491 return ret;
492
72c531f8 493 uiov = compat_ptr(msg.msg_iov);
f9ead18c
JA		 494 if (req->flags & REQ_F_BUFFER_SELECT) {
495 compat_ssize_t clen;
496
990a4de5 497 iomsg->free_iov = NULL;
72c531f8 498 if (msg.msg_iovlen == 0) {
6d2f75a0 499 sr->len = 0;
72c531f8 500 } else if (msg.msg_iovlen > 1) {
f9ead18c 501 return -EINVAL;
6d2f75a0
DY		 502 } else {
503 if (!access_ok(uiov, sizeof(*uiov)))
504 return -EFAULT;
505 if (__get_user(clen, &uiov->iov_len))
506 return -EFAULT;
507 if (clen < 0)
508 return -EINVAL;
509 sr->len = clen;
6d2f75a0 510 }
9bb66906
DY		 511
512 if (req->flags & REQ_F_APOLL_MULTISHOT) {
513 iomsg->namelen = msg.msg_namelen;
514 iomsg->controllen = msg.msg_controllen;
515 if (io_recvmsg_multishot_overflow(iomsg))
516 return -EOVERFLOW;
517 }
f9ead18c
JA		 518 } else {
519 iomsg->free_iov = iomsg->fast_iov;
de4eda9d 520 ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen,
f9ead18c
JA		 521 UIO_FASTIOV, &iomsg->free_iov,
522 &iomsg->msg.msg_iter, true);
523 if (ret < 0)
524 return ret;
525 }
526
527 return 0;
528}
529#endif
530
531static int io_recvmsg_copy_hdr(struct io_kiocb *req,
532 struct io_async_msghdr *iomsg)
533{
534 iomsg->msg.msg_name = &iomsg->addr;
535
536#ifdef CONFIG_COMPAT
537 if (req->ctx->compat)
538 return __io_compat_recvmsg_copy_hdr(req, iomsg);
539#endif
540
541 return __io_recvmsg_copy_hdr(req, iomsg);
542}
543
544int io_recvmsg_prep_async(struct io_kiocb *req)
545{
546 int ret;
547
858c293e
PB		 548 if (!io_msg_alloc_async_prep(req))
549 return -ENOMEM;
f9ead18c
JA		 550 ret = io_recvmsg_copy_hdr(req, req->async_data);
551 if (!ret)
552 req->flags |= REQ_F_NEED_CLEANUP;
553 return ret;
554}
555
b3fdea6e
DY		 556#define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT)
557
f9ead18c
JA		 558int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
559{
f2ccb5ae 560 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 561
562 if (unlikely(sqe->file_index || sqe->addr2))
563 return -EINVAL;
564
565 sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
566 sr->len = READ_ONCE(sqe->len);
567 sr->flags = READ_ONCE(sqe->ioprio);
b3fdea6e 568 if (sr->flags & ~(RECVMSG_FLAGS))
f9ead18c
JA		 569 return -EINVAL;
570 sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
571 if (sr->msg_flags & MSG_DONTWAIT)
572 req->flags |= REQ_F_NOWAIT;
573 if (sr->msg_flags & MSG_ERRQUEUE)
574 req->flags |= REQ_F_CLEAR_POLLIN;
b3fdea6e
DY		 575 if (sr->flags & IORING_RECV_MULTISHOT) {
576 if (!(req->flags & REQ_F_BUFFER_SELECT))
577 return -EINVAL;
578 if (sr->msg_flags & MSG_WAITALL)
579 return -EINVAL;
580 if (req->opcode == IORING_OP_RECV && sr->len)
581 return -EINVAL;
582 req->flags |= REQ_F_APOLL_MULTISHOT;
583 }
f9ead18c
JA		 584
585#ifdef CONFIG_COMPAT
586 if (req->ctx->compat)
587 sr->msg_flags |= MSG_CMSG_COMPAT;
588#endif
589 sr->done_io = 0;
590 return 0;
591}
592
b3fdea6e
DY		 593static inline void io_recv_prep_retry(struct io_kiocb *req)
594{
f2ccb5ae 595 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
b3fdea6e
DY		 596
597 sr->done_io = 0;
598 sr->len = 0; /* get from the provided buffer */
599}
600
601/*
9bb66906 602 * Finishes io_recv and io_recvmsg.
b3fdea6e
DY		 603 *
604 * Returns true if it is actually finished, or false if it should run
605 * again (for multishot).
606 */
9bb66906 607static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
100d6b17
PB		 608 unsigned int cflags, bool mshot_finished,
609 unsigned issue_flags)
b3fdea6e
DY		 610{
611 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
612 io_req_set_res(req, *ret, cflags);
613 *ret = IOU_OK;
614 return true;
615 }
616
9bb66906 617 if (!mshot_finished) {
9b8c5475
DY		 618 if (io_aux_cqe(req->ctx, issue_flags & IO_URING_F_COMPLETE_DEFER,
619 req->cqe.user_data, *ret, cflags | IORING_CQE_F_MORE, true)) {
b3fdea6e
DY		 620 io_recv_prep_retry(req);
621 return false;
622 }
e2ad599d 623 /* Otherwise stop multishot but use the current result. */
b3fdea6e
DY		 624 }
625
626 io_req_set_res(req, *ret, cflags);
627
100d6b17 628 if (issue_flags & IO_URING_F_MULTISHOT)
b3fdea6e 629 *ret = IOU_STOP_MULTISHOT;
e2df2ccb
DY		 630 else
631 *ret = IOU_OK;
b3fdea6e
DY		 632 return true;
633}
634
9bb66906
DY		 635static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg,
636 struct io_sr_msg *sr, void __user **buf,
637 size_t *len)
638{
639 unsigned long ubuf = (unsigned long) *buf;
640 unsigned long hdr;
641
642 hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
643 kmsg->controllen;
644 if (*len < hdr)
645 return -EFAULT;
646
647 if (kmsg->controllen) {
648 unsigned long control = ubuf + hdr - kmsg->controllen;
649
d1f6222c 650 kmsg->msg.msg_control_user = (void __user *) control;
9bb66906
DY		 651 kmsg->msg.msg_controllen = kmsg->controllen;
652 }
653
654 sr->buf = *buf; /* stash for later copy */
d1f6222c 655 *buf = (void __user *) (ubuf + hdr);
9bb66906
DY		 656 kmsg->payloadlen = *len = *len - hdr;
657 return 0;
658}
659
660struct io_recvmsg_multishot_hdr {
661 struct io_uring_recvmsg_out msg;
662 struct sockaddr_storage addr;
663};
664
665static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io,
666 struct io_async_msghdr *kmsg,
667 unsigned int flags, bool *finished)
668{
669 int err;
670 int copy_len;
671 struct io_recvmsg_multishot_hdr hdr;
672
673 if (kmsg->namelen)
674 kmsg->msg.msg_name = &hdr.addr;
675 kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
676 kmsg->msg.msg_namelen = 0;
677
678 if (sock->file->f_flags & O_NONBLOCK)
679 flags |= MSG_DONTWAIT;
680
681 err = sock_recvmsg(sock, &kmsg->msg, flags);
682 *finished = err <= 0;
683 if (err < 0)
684 return err;
685
686 hdr.msg = (struct io_uring_recvmsg_out) {
687 .controllen = kmsg->controllen - kmsg->msg.msg_controllen,
688 .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT
689 };
690
691 hdr.msg.payloadlen = err;
692 if (err > kmsg->payloadlen)
693 err = kmsg->payloadlen;
694
695 copy_len = sizeof(struct io_uring_recvmsg_out);
696 if (kmsg->msg.msg_namelen > kmsg->namelen)
697 copy_len += kmsg->namelen;
698 else
699 copy_len += kmsg->msg.msg_namelen;
700
701 /*
702 * "fromlen shall refer to the value before truncation.."
703 * 1003.1g
704 */
705 hdr.msg.namelen = kmsg->msg.msg_namelen;
706
707 /* ensure that there is no gap between hdr and sockaddr_storage */
708 BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) !=
709 sizeof(struct io_uring_recvmsg_out));
710 if (copy_to_user(io->buf, &hdr, copy_len)) {
711 *finished = true;
712 return -EFAULT;
713 }
714
715 return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
716 kmsg->controllen + err;
717}
718
f9ead18c
JA		 719int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
720{
f2ccb5ae 721 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 722 struct io_async_msghdr iomsg, *kmsg;
723 struct socket *sock;
724 unsigned int cflags;
725 unsigned flags;
726 int ret, min_ret = 0;
727 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
9bb66906 728 bool mshot_finished = true;
f9ead18c
JA		 729
730 sock = sock_from_file(req->file);
731 if (unlikely(!sock))
732 return -ENOTSOCK;
733
734 if (req_has_async_data(req)) {
735 kmsg = req->async_data;
736 } else {
737 ret = io_recvmsg_copy_hdr(req, &iomsg);
738 if (ret)
739 return ret;
740 kmsg = &iomsg;
741 }
742
743 if (!(req->flags & REQ_F_POLLED) &&
744 (sr->flags & IORING_RECVSEND_POLL_FIRST))
43e0bbbd 745 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c 746
17add5ce
PB		 747 if (!io_check_multishot(req, issue_flags))
748 return io_setup_async_msg(req, kmsg, issue_flags);
749
9bb66906 750retry_multishot:
f9ead18c
JA		 751 if (io_do_buffer_select(req)) {
752 void __user *buf;
9bb66906 753 size_t len = sr->len;
f9ead18c 754
9bb66906 755 buf = io_buffer_select(req, &len, issue_flags);
f9ead18c
JA		 756 if (!buf)
757 return -ENOBUFS;
9bb66906
DY		 758
759 if (req->flags & REQ_F_APOLL_MULTISHOT) {
760 ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len);
761 if (ret) {
762 io_kbuf_recycle(req, issue_flags);
763 return ret;
764 }
765 }
766
f9ead18c 767 kmsg->fast_iov[0].iov_base = buf;
9bb66906 768 kmsg->fast_iov[0].iov_len = len;
de4eda9d 769 iov_iter_init(&kmsg->msg.msg_iter, ITER_DEST, kmsg->fast_iov, 1,
9bb66906 770 len);
f9ead18c
JA		 771 }
772
773 flags = sr->msg_flags;
774 if (force_nonblock)
775 flags |= MSG_DONTWAIT;
776 if (flags & MSG_WAITALL)
777 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
778
779 kmsg->msg.msg_get_inq = 1;
9bb66906
DY		 780 if (req->flags & REQ_F_APOLL_MULTISHOT)
781 ret = io_recvmsg_multishot(sock, sr, kmsg, flags,
782 &mshot_finished);
783 else
784 ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg,
785 kmsg->uaddr, flags);
786
f9ead18c 787 if (ret < min_ret) {
9bb66906
DY		 788 if (ret == -EAGAIN && force_nonblock) {
789 ret = io_setup_async_msg(req, kmsg, issue_flags);
100d6b17 790 if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) {
9bb66906
DY		 791 io_kbuf_recycle(req, issue_flags);
792 return IOU_ISSUE_SKIP_COMPLETE;
793 }
794 return ret;
795 }
f9ead18c
JA		 796 if (ret > 0 && io_net_retry(sock, flags)) {
797 sr->done_io += ret;
798 req->flags |= REQ_F_PARTIAL_IO;
43e0bbbd 799 return io_setup_async_msg(req, kmsg, issue_flags);
f9ead18c 800 }
95eafc74
PB		 801 if (ret == -ERESTARTSYS)
802 ret = -EINTR;
f9ead18c
JA		 803 req_set_fail(req);
804 } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
805 req_set_fail(req);
806 }
807
d4e097da 808 if (ret > 0)
f9ead18c
JA		 809 ret += sr->done_io;
810 else if (sr->done_io)
811 ret = sr->done_io;
d4e097da
DY		 812 else
813 io_kbuf_recycle(req, issue_flags);
814
f9ead18c
JA		 815 cflags = io_put_kbuf(req, issue_flags);
816 if (kmsg->msg.msg_inq)
817 cflags |= IORING_CQE_F_SOCK_NONEMPTY;
b3fdea6e 818
100d6b17 819 if (!io_recv_finish(req, &ret, cflags, mshot_finished, issue_flags))
9bb66906
DY		 820 goto retry_multishot;
821
822 if (mshot_finished) {
9bb66906
DY		 823 /* fast path, check for non-NULL to avoid function call */
824 if (kmsg->free_iov)
825 kfree(kmsg->free_iov);
6c3e8955 826 io_netmsg_recycle(req, issue_flags);
9bb66906
DY		 827 req->flags &= ~REQ_F_NEED_CLEANUP;
828 }
829
830 return ret;
f9ead18c
JA		 831}
832
833int io_recv(struct io_kiocb *req, unsigned int issue_flags)
834{
f2ccb5ae 835 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
f9ead18c
JA		 836 struct msghdr msg;
837 struct socket *sock;
838 struct iovec iov;
839 unsigned int cflags;
840 unsigned flags;
841 int ret, min_ret = 0;
842 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
b3fdea6e 843 size_t len = sr->len;
f9ead18c
JA		 844
845 if (!(req->flags & REQ_F_POLLED) &&
846 (sr->flags & IORING_RECVSEND_POLL_FIRST))
847 return -EAGAIN;
848
17add5ce
PB		 849 if (!io_check_multishot(req, issue_flags))
850 return -EAGAIN;
851
f9ead18c
JA		 852 sock = sock_from_file(req->file);
853 if (unlikely(!sock))
854 return -ENOTSOCK;
855
b3fdea6e 856retry_multishot:
f9ead18c
JA		 857 if (io_do_buffer_select(req)) {
858 void __user *buf;
859
b3fdea6e 860 buf = io_buffer_select(req, &len, issue_flags);
f9ead18c
JA		 861 if (!buf)
862 return -ENOBUFS;
863 sr->buf = buf;
864 }
865
de4eda9d 866 ret = import_single_range(ITER_DEST, sr->buf, len, &iov, &msg.msg_iter);
f9ead18c
JA		 867 if (unlikely(ret))
868 goto out_free;
869
870 msg.msg_name = NULL;
871 msg.msg_namelen = 0;
872 msg.msg_control = NULL;
873 msg.msg_get_inq = 1;
874 msg.msg_flags = 0;
875 msg.msg_controllen = 0;
876 msg.msg_iocb = NULL;
e02b6651 877 msg.msg_ubuf = NULL;
f9ead18c
JA		 878
879 flags = sr->msg_flags;
880 if (force_nonblock)
881 flags |= MSG_DONTWAIT;
882 if (flags & MSG_WAITALL)
883 min_ret = iov_iter_count(&msg.msg_iter);
884
885 ret = sock_recvmsg(sock, &msg, flags);
886 if (ret < min_ret) {
b3fdea6e 887 if (ret == -EAGAIN && force_nonblock) {
100d6b17 888 if (issue_flags & IO_URING_F_MULTISHOT) {
b3fdea6e
DY		 889 io_kbuf_recycle(req, issue_flags);
890 return IOU_ISSUE_SKIP_COMPLETE;
891 }
892
f9ead18c 893 return -EAGAIN;
b3fdea6e 894 }
f9ead18c
JA		 895 if (ret > 0 && io_net_retry(sock, flags)) {
896 sr->len -= ret;
897 sr->buf += ret;
898 sr->done_io += ret;
899 req->flags |= REQ_F_PARTIAL_IO;
900 return -EAGAIN;
901 }
95eafc74
PB		 902 if (ret == -ERESTARTSYS)
903 ret = -EINTR;
f9ead18c
JA		 904 req_set_fail(req);
905 } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
906out_free:
907 req_set_fail(req);
908 }
909
d4e097da 910 if (ret > 0)
f9ead18c
JA		 911 ret += sr->done_io;
912 else if (sr->done_io)
913 ret = sr->done_io;
d4e097da
DY		 914 else
915 io_kbuf_recycle(req, issue_flags);
916
f9ead18c
JA		 917 cflags = io_put_kbuf(req, issue_flags);
918 if (msg.msg_inq)
919 cflags |= IORING_CQE_F_SOCK_NONEMPTY;
b3fdea6e 920
100d6b17 921 if (!io_recv_finish(req, &ret, cflags, ret <= 0, issue_flags))
b3fdea6e
DY		 922 goto retry_multishot;
923
924 return ret;
f9ead18c
JA		 925}
926
b0e9b551 927void io_send_zc_cleanup(struct io_kiocb *req)
b48c312b 928{
ac9e5784 929 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
493108d9 930 struct io_async_msghdr *io;
b48c312b 931
493108d9
PB		 932 if (req_has_async_data(req)) {
933 io = req->async_data;
4c17a496
PB		 934 /* might be ->fast_iov if *msg_copy_hdr failed */
935 if (io->free_iov != io->fast_iov)
936 kfree(io->free_iov);
493108d9 937 }
a75155fa 938 if (zc->notif) {
a75155fa
PB		 939 io_notif_flush(zc->notif);
940 zc->notif = NULL;
941 }
b48c312b
PB		 942}
943
40725d1b
PB		 944#define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF)
945#define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE)
946
b0e9b551 947int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
06a5464b 948{
ac9e5784 949 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
10c7d33e 950 struct io_ring_ctx *ctx = req->ctx;
b48c312b 951 struct io_kiocb *notif;
06a5464b 952
493108d9 953 if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)))
b48c312b
PB		 954 return -EINVAL;
955 /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */
956 if (req->flags & REQ_F_CQE_SKIP)
06a5464b
PB		 957 return -EINVAL;
958
e3366e02
PB		 959 notif = zc->notif = io_alloc_notif(ctx);
960 if (!notif)
961 return -ENOMEM;
962 notif->cqe.user_data = req->cqe.user_data;
963 notif->cqe.res = 0;
964 notif->cqe.flags = IORING_CQE_F_NOTIF;
965 req->flags |= REQ_F_NEED_CLEANUP;
40725d1b
PB		 966
967 zc->flags = READ_ONCE(sqe->ioprio);
968 if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) {
969 if (zc->flags & ~IO_ZC_FLAGS_VALID)
970 return -EINVAL;
971 if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) {
972 io_notif_set_extended(notif);
973 io_notif_to_data(notif)->zc_report = true;
974 }
975 }
976
10c7d33e
PB		 977 if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
978 unsigned idx = READ_ONCE(sqe->buf_index);
979
980 if (unlikely(idx >= ctx->nr_user_bufs))
981 return -EFAULT;
982 idx = array_index_nospec(idx, ctx->nr_user_bufs);
983 req->imu = READ_ONCE(ctx->user_bufs[idx]);
e3366e02 984 io_req_set_rsrc_node(notif, ctx, 0);
10c7d33e 985 }
06a5464b 986
493108d9
PB		 987 if (req->opcode == IORING_OP_SEND_ZC) {
988 if (READ_ONCE(sqe->__pad3[0]))
989 return -EINVAL;
990 zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
991 zc->addr_len = READ_ONCE(sqe->addr_len);
992 } else {
993 if (unlikely(sqe->addr2 || sqe->file_index))
994 return -EINVAL;
995 if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF))
996 return -EINVAL;
997 }
998
06a5464b
PB		 999 zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr));
1000 zc->len = READ_ONCE(sqe->len);
1001 zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
06a5464b
PB		 1002 if (zc->msg_flags & MSG_DONTWAIT)
1003 req->flags |= REQ_F_NOWAIT;
092aeedb 1004
4a933e62 1005 zc->done_io = 0;
092aeedb 1006
06a5464b
PB		 1007#ifdef CONFIG_COMPAT
1008 if (req->ctx->compat)
1009 zc->msg_flags |= MSG_CMSG_COMPAT;
1010#endif
1011 return 0;
1012}
1013
cd9021e8
PB		 1014static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb,
1015 struct iov_iter *from, size_t length)
1016{
1017 skb_zcopy_downgrade_managed(skb);
1018 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length);
1019}
1020
3ff1a0d3
PB		 1021static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb,
1022 struct iov_iter *from, size_t length)
1023{
1024 struct skb_shared_info *shinfo = skb_shinfo(skb);
1025 int frag = shinfo->nr_frags;
1026 int ret = 0;
1027 struct bvec_iter bi;
1028 ssize_t copied = 0;
1029 unsigned long truesize = 0;
1030
cd9021e8 1031 if (!frag)
3ff1a0d3 1032 shinfo->flags |= SKBFL_MANAGED_FRAG_REFS;
cd9021e8 1033 else if (unlikely(!skb_zcopy_managed(skb)))
3ff1a0d3 1034 return __zerocopy_sg_from_iter(NULL, sk, skb, from, length);
3ff1a0d3
PB		 1035
1036 bi.bi_size = min(from->count, length);
1037 bi.bi_bvec_done = from->iov_offset;
1038 bi.bi_idx = 0;
1039
1040 while (bi.bi_size && frag < MAX_SKB_FRAGS) {
1041 struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi);
1042
1043 copied += v.bv_len;
1044 truesize += PAGE_ALIGN(v.bv_len + v.bv_offset);
1045 __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page,
1046 v.bv_offset, v.bv_len);
1047 bvec_iter_advance_single(from->bvec, &bi, v.bv_len);
1048 }
1049 if (bi.bi_size)
1050 ret = -EMSGSIZE;
1051
1052 shinfo->nr_frags = frag;
1053 from->bvec += bi.bi_idx;
1054 from->nr_segs -= bi.bi_idx;
dfb58b17 1055 from->count -= copied;
3ff1a0d3
PB		 1056 from->iov_offset = bi.bi_bvec_done;
1057
1058 skb->data_len += copied;
1059 skb->len += copied;
1060 skb->truesize += truesize;
1061
1062 if (sk && sk->sk_type == SOCK_STREAM) {
1063 sk_wmem_queued_add(sk, truesize);
1064 if (!skb_zcopy_pure(skb))
1065 sk_mem_charge(sk, truesize);
1066 } else {
1067 refcount_add(truesize, &skb->sk->sk_wmem_alloc);
1068 }
1069 return ret;
1070}
1071
b0e9b551 1072int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
06a5464b 1073{
6ae61b7a 1074 struct sockaddr_storage __address;
ac9e5784 1075 struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
06a5464b
PB		 1076 struct msghdr msg;
1077 struct iovec iov;
1078 struct socket *sock;
6ae91ac9 1079 unsigned msg_flags;
06a5464b
PB		 1080 int ret, min_ret = 0;
1081
06a5464b
PB		 1082 sock = sock_from_file(req->file);
1083 if (unlikely(!sock))
1084 return -ENOTSOCK;
edf81438
PB		 1085 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
1086 return -EOPNOTSUPP;
06a5464b 1087
06a5464b
PB		 1088 msg.msg_name = NULL;
1089 msg.msg_control = NULL;
1090 msg.msg_controllen = 0;
1091 msg.msg_namelen = 0;
1092
86dc8f23 1093 if (zc->addr) {
581711c4
PB		 1094 if (req_has_async_data(req)) {
1095 struct io_async_msghdr *io = req->async_data;
1096
6ae61b7a 1097 msg.msg_name = &io->addr;
581711c4
PB		 1098 } else {
1099 ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address);
1100 if (unlikely(ret < 0))
1101 return ret;
1102 msg.msg_name = (struct sockaddr *)&__address;
581711c4 1103 }
86dc8f23
PB		 1104 msg.msg_namelen = zc->addr_len;
1105 }
1106
3c840053
PB		 1107 if (!(req->flags & REQ_F_POLLED) &&
1108 (zc->flags & IORING_RECVSEND_POLL_FIRST))
6ae61b7a 1109 return io_setup_async_addr(req, &__address, issue_flags);
3c840053 1110
10c7d33e 1111 if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
de4eda9d 1112 ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu,
10c7d33e
PB		 1113 (u64)(uintptr_t)zc->buf, zc->len);
1114 if (unlikely(ret))
986e263d 1115 return ret;
cd9021e8 1116 msg.sg_from_iter = io_sg_from_iter;
10c7d33e 1117 } else {
42385b02 1118 io_notif_set_extended(zc->notif);
de4eda9d 1119 ret = import_single_range(ITER_SOURCE, zc->buf, zc->len, &iov,
10c7d33e
PB		 1120 &msg.msg_iter);
1121 if (unlikely(ret))
1122 return ret;
b48c312b 1123 ret = io_notif_account_mem(zc->notif, zc->len);
2e32ba56
PB		 1124 if (unlikely(ret))
1125 return ret;
cd9021e8 1126 msg.sg_from_iter = io_sg_from_iter_iovec;
10c7d33e 1127 }
06a5464b
PB		 1128
1129 msg_flags = zc->msg_flags | MSG_ZEROCOPY;
1130 if (issue_flags & IO_URING_F_NONBLOCK)
1131 msg_flags |= MSG_DONTWAIT;
1132 if (msg_flags & MSG_WAITALL)
1133 min_ret = iov_iter_count(&msg.msg_iter);
1134
1135 msg.msg_flags = msg_flags;
b48c312b 1136 msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg;
06a5464b
PB		 1137 ret = sock_sendmsg(sock, &msg);
1138
1139 if (unlikely(ret < min_ret)) {
1140 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
6ae61b7a 1141 return io_setup_async_addr(req, &__address, issue_flags);
581711c4 1142
4a933e62
PB		 1143 if (ret > 0 && io_net_retry(sock, msg.msg_flags)) {
1144 zc->len -= ret;
1145 zc->buf += ret;
1146 zc->done_io += ret;
1147 req->flags |= REQ_F_PARTIAL_IO;
6ae61b7a 1148 return io_setup_async_addr(req, &__address, issue_flags);
4a933e62
PB		 1149 }
1150 if (ret == -ERESTARTSYS)
1151 ret = -EINTR;
5a848b7c 1152 req_set_fail(req);
06a5464b
PB		 1153 }
1154
4a933e62
PB		 1155 if (ret >= 0)
1156 ret += zc->done_io;
1157 else if (zc->done_io)
1158 ret = zc->done_io;
b48c312b 1159
108893dd
PB		 1160 /*
1161 * If we're in io-wq we can't rely on tw ordering guarantees, defer
1162 * flushing notif to io_send_zc_cleanup()
1163 */
1164 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
1165 io_notif_flush(zc->notif);
1166 req->flags &= ~REQ_F_NEED_CLEANUP;
1167 }
6ae91ac9 1168 io_req_set_res(req, ret, IORING_CQE_F_MORE);
06a5464b
PB		 1169 return IOU_OK;
1170}
1171
493108d9
PB		 1172int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
1173{
1174 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
1175 struct io_async_msghdr iomsg, *kmsg;
1176 struct socket *sock;
6ae91ac9 1177 unsigned flags;
493108d9
PB		 1178 int ret, min_ret = 0;
1179
42385b02
PB		 1180 io_notif_set_extended(sr->notif);
1181
493108d9
PB		 1182 sock = sock_from_file(req->file);
1183 if (unlikely(!sock))
1184 return -ENOTSOCK;
cc767e7c
PB		 1185 if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
1186 return -EOPNOTSUPP;
493108d9
PB		 1187
1188 if (req_has_async_data(req)) {
1189 kmsg = req->async_data;
1190 } else {
1191 ret = io_sendmsg_copy_hdr(req, &iomsg);
1192 if (ret)
1193 return ret;
1194 kmsg = &iomsg;
1195 }
1196
1197 if (!(req->flags & REQ_F_POLLED) &&
1198 (sr->flags & IORING_RECVSEND_POLL_FIRST))
1199 return io_setup_async_msg(req, kmsg, issue_flags);
1200
1201 flags = sr->msg_flags | MSG_ZEROCOPY;
1202 if (issue_flags & IO_URING_F_NONBLOCK)
1203 flags |= MSG_DONTWAIT;
1204 if (flags & MSG_WAITALL)
1205 min_ret = iov_iter_count(&kmsg->msg.msg_iter);
1206
1207 kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg;
1208 kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
1209 ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
1210
1211 if (unlikely(ret < min_ret)) {
1212 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1213 return io_setup_async_msg(req, kmsg, issue_flags);
1214
1215 if (ret > 0 && io_net_retry(sock, flags)) {
1216 sr->done_io += ret;
1217 req->flags |= REQ_F_PARTIAL_IO;
1218 return io_setup_async_msg(req, kmsg, issue_flags);
1219 }
493108d9
PB		 1220 if (ret == -ERESTARTSYS)
1221 ret = -EINTR;
1222 req_set_fail(req);
1223 }
1224 /* fast path, check for non-NULL to avoid function call */
108893dd 1225 if (kmsg->free_iov) {
493108d9 1226 kfree(kmsg->free_iov);
108893dd
PB		 1227 kmsg->free_iov = NULL;
1228 }
493108d9
PB		 1229
1230 io_netmsg_recycle(req, issue_flags);
1231 if (ret >= 0)
1232 ret += sr->done_io;
1233 else if (sr->done_io)
1234 ret = sr->done_io;
1235
108893dd
PB		 1236 /*
1237 * If we're in io-wq we can't rely on tw ordering guarantees, defer
1238 * flushing notif to io_send_zc_cleanup()
1239 */
1240 if (!(issue_flags & IO_URING_F_UNLOCKED)) {
1241 io_notif_flush(sr->notif);
1242 req->flags &= ~REQ_F_NEED_CLEANUP;
1243 }
6ae91ac9 1244 io_req_set_res(req, ret, IORING_CQE_F_MORE);
493108d9
PB		 1245 return IOU_OK;
1246}
1247
7e6b638e
PB		 1248void io_sendrecv_fail(struct io_kiocb *req)
1249{
1250 struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
7e6b638e
PB		 1251
1252 if (req->flags & REQ_F_PARTIAL_IO)
6ae91ac9
PB		 1253 req->cqe.res = sr->done_io;
1254
c4c0009e 1255 if ((req->flags & REQ_F_NEED_CLEANUP) &&
6ae91ac9
PB		 1256 (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC))
1257 req->cqe.flags |= IORING_CQE_F_MORE;
5693bcce
PB		 1258}
1259
f9ead18c
JA		 1260int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1261{
f2ccb5ae 1262 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
f9ead18c
JA		 1263 unsigned flags;
1264
1265 if (sqe->len || sqe->buf_index)
1266 return -EINVAL;
1267
1268 accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1269 accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
1270 accept->flags = READ_ONCE(sqe->accept_flags);
1271 accept->nofile = rlimit(RLIMIT_NOFILE);
1272 flags = READ_ONCE(sqe->ioprio);
1273 if (flags & ~IORING_ACCEPT_MULTISHOT)
1274 return -EINVAL;
1275
1276 accept->file_slot = READ_ONCE(sqe->file_index);
1277 if (accept->file_slot) {
1278 if (accept->flags & SOCK_CLOEXEC)
1279 return -EINVAL;
1280 if (flags & IORING_ACCEPT_MULTISHOT &&
1281 accept->file_slot != IORING_FILE_INDEX_ALLOC)
1282 return -EINVAL;
1283 }
1284 if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1285 return -EINVAL;
1286 if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
1287 accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
1288 if (flags & IORING_ACCEPT_MULTISHOT)
1289 req->flags |= REQ_F_APOLL_MULTISHOT;
1290 return 0;
1291}
1292
1293int io_accept(struct io_kiocb *req, unsigned int issue_flags)
1294{
1295 struct io_ring_ctx *ctx = req->ctx;
f2ccb5ae 1296 struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
f9ead18c
JA		 1297 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1298 unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0;
1299 bool fixed = !!accept->file_slot;
1300 struct file *file;
1301 int ret, fd;
1302
17add5ce
PB		 1303 if (!io_check_multishot(req, issue_flags))
1304 return -EAGAIN;
f9ead18c
JA		 1305retry:
1306 if (!fixed) {
1307 fd = __get_unused_fd_flags(accept->flags, accept->nofile);
1308 if (unlikely(fd < 0))
1309 return fd;
1310 }
1311 file = do_accept(req->file, file_flags, accept->addr, accept->addr_len,
1312 accept->flags);
1313 if (IS_ERR(file)) {
1314 if (!fixed)
1315 put_unused_fd(fd);
1316 ret = PTR_ERR(file);
1317 if (ret == -EAGAIN && force_nonblock) {
1318 /*
1319 * if it's multishot and polled, we don't need to
1320 * return EAGAIN to arm the poll infra since it
1321 * has already been done
1322 */
91482864 1323 if (issue_flags & IO_URING_F_MULTISHOT)
f9ead18c
JA		 1324 ret = IOU_ISSUE_SKIP_COMPLETE;
1325 return ret;
1326 }
1327 if (ret == -ERESTARTSYS)
1328 ret = -EINTR;
1329 req_set_fail(req);
1330 } else if (!fixed) {
1331 fd_install(fd, file);
1332 ret = fd;
1333 } else {
1334 ret = io_fixed_fd_install(req, issue_flags, file,
1335 accept->file_slot);
1336 }
1337
1338 if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
1339 io_req_set_res(req, ret, 0);
1340 return IOU_OK;
1341 }
f9ead18c 1342
515e2696
DY		 1343 if (ret < 0)
1344 return ret;
9b8c5475
DY		 1345 if (io_aux_cqe(ctx, issue_flags & IO_URING_F_COMPLETE_DEFER,
1346 req->cqe.user_data, ret, IORING_CQE_F_MORE, true))
d245bca6 1347 goto retry;
cbd25748 1348
515e2696 1349 return -ECANCELED;
f9ead18c
JA		 1350}
1351
1352int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1353{
f2ccb5ae 1354 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
f9ead18c
JA		 1355
1356 if (sqe->addr || sqe->rw_flags || sqe->buf_index)
1357 return -EINVAL;
1358
1359 sock->domain = READ_ONCE(sqe->fd);
1360 sock->type = READ_ONCE(sqe->off);
1361 sock->protocol = READ_ONCE(sqe->len);
1362 sock->file_slot = READ_ONCE(sqe->file_index);
1363 sock->nofile = rlimit(RLIMIT_NOFILE);
1364
1365 sock->flags = sock->type & ~SOCK_TYPE_MASK;
1366 if (sock->file_slot && (sock->flags & SOCK_CLOEXEC))
1367 return -EINVAL;
1368 if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
1369 return -EINVAL;
1370 return 0;
1371}
1372
1373int io_socket(struct io_kiocb *req, unsigned int issue_flags)
1374{
f2ccb5ae 1375 struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
f9ead18c
JA		 1376 bool fixed = !!sock->file_slot;
1377 struct file *file;
1378 int ret, fd;
1379
1380 if (!fixed) {
1381 fd = __get_unused_fd_flags(sock->flags, sock->nofile);
1382 if (unlikely(fd < 0))
1383 return fd;
1384 }
1385 file = __sys_socket_file(sock->domain, sock->type, sock->protocol);
1386 if (IS_ERR(file)) {
1387 if (!fixed)
1388 put_unused_fd(fd);
1389 ret = PTR_ERR(file);
1390 if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
1391 return -EAGAIN;
1392 if (ret == -ERESTARTSYS)
1393 ret = -EINTR;
1394 req_set_fail(req);
1395 } else if (!fixed) {
1396 fd_install(fd, file);
1397 ret = fd;
1398 } else {
1399 ret = io_fixed_fd_install(req, issue_flags, file,
1400 sock->file_slot);
1401 }
1402 io_req_set_res(req, ret, 0);
1403 return IOU_OK;
1404}
1405
1406int io_connect_prep_async(struct io_kiocb *req)
1407{
1408 struct io_async_connect *io = req->async_data;
f2ccb5ae 1409 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
f9ead18c
JA		 1410
1411 return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address);
1412}
1413
1414int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
1415{
f2ccb5ae 1416 struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
f9ead18c
JA		 1417
1418 if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
1419 return -EINVAL;
1420
1421 conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
1422 conn->addr_len = READ_ONCE(sqe->addr2);
3fb1bd68 1423 conn->in_progress = false;
f9ead18c
JA		 1424 return 0;
1425}
1426
1427int io_connect(struct io_kiocb *req, unsigned int issue_flags)
1428{
f2ccb5ae 1429 struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect);
f9ead18c
JA		 1430 struct io_async_connect __io, *io;
1431 unsigned file_flags;
1432 int ret;
1433 bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
1434
3fb1bd68
JA		 1435 if (connect->in_progress) {
1436 struct socket *socket;
1437
1438 ret = -ENOTSOCK;
1439 socket = sock_from_file(req->file);
1440 if (socket)
1441 ret = sock_error(socket->sk);
1442 goto out;
1443 }
1444
f9ead18c
JA		 1445 if (req_has_async_data(req)) {
1446 io = req->async_data;
1447 } else {
1448 ret = move_addr_to_kernel(connect->addr,
1449 connect->addr_len,
1450 &__io.address);
1451 if (ret)
1452 goto out;
1453 io = &__io;
1454 }
1455
1456 file_flags = force_nonblock ? O_NONBLOCK : 0;
1457
1458 ret = __sys_connect_file(req->file, &io->address,
1459 connect->addr_len, file_flags);
1460 if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) {
3fb1bd68
JA		 1461 if (ret == -EINPROGRESS) {
1462 connect->in_progress = true;
1463 } else {
1464 if (req_has_async_data(req))
1465 return -EAGAIN;
1466 if (io_alloc_async_data(req)) {
1467 ret = -ENOMEM;
1468 goto out;
1469 }
1470 memcpy(req->async_data, &__io, sizeof(__io));
f9ead18c 1471 }
f9ead18c
JA		 1472 return -EAGAIN;
1473 }
1474 if (ret == -ERESTARTSYS)
1475 ret = -EINTR;
1476out:
1477 if (ret < 0)
1478 req_set_fail(req);
1479 io_req_set_res(req, ret, 0);
1480 return IOU_OK;
1481}
43e0bbbd
JA		 1482
1483void io_netmsg_cache_free(struct io_cache_entry *entry)
1484{
1485 kfree(container_of(entry, struct io_async_msghdr, cache));
1486}
f9ead18c 1487#endif
Linux 6.x block layer and io_uring tree(s)