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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 JA |
16 | #include "net.h" |
17 | ||
18 | #if defined(CONFIG_NET) | |
19 | struct io_shutdown { | |
20 | struct file *file; | |
21 | int how; | |
22 | }; | |
23 | ||
24 | struct io_accept { | |
25 | struct file *file; | |
26 | struct sockaddr __user *addr; | |
27 | int __user *addr_len; | |
28 | int flags; | |
29 | u32 file_slot; | |
30 | unsigned long nofile; | |
31 | }; | |
32 | ||
33 | struct io_socket { | |
34 | struct file *file; | |
35 | int domain; | |
36 | int type; | |
37 | int protocol; | |
38 | int flags; | |
39 | u32 file_slot; | |
40 | unsigned long nofile; | |
41 | }; | |
42 | ||
43 | struct io_connect { | |
44 | struct file *file; | |
45 | struct sockaddr __user *addr; | |
46 | int addr_len; | |
47 | }; | |
48 | ||
49 | struct io_sr_msg { | |
50 | struct file *file; | |
51 | union { | |
52 | struct compat_msghdr __user *umsg_compat; | |
53 | struct user_msghdr __user *umsg; | |
54 | void __user *buf; | |
55 | }; | |
56 | int msg_flags; | |
57 | size_t len; | |
58 | size_t done_io; | |
59 | unsigned int flags; | |
60 | }; | |
61 | ||
62 | #define IO_APOLL_MULTI_POLLED (REQ_F_APOLL_MULTISHOT | REQ_F_POLLED) | |
63 | ||
64 | int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
65 | { | |
66 | struct io_shutdown *shutdown = io_kiocb_to_cmd(req); | |
67 | ||
68 | if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || | |
69 | sqe->buf_index || sqe->splice_fd_in)) | |
70 | return -EINVAL; | |
71 | ||
72 | shutdown->how = READ_ONCE(sqe->len); | |
73 | return 0; | |
74 | } | |
75 | ||
76 | int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) | |
77 | { | |
78 | struct io_shutdown *shutdown = io_kiocb_to_cmd(req); | |
79 | struct socket *sock; | |
80 | int ret; | |
81 | ||
82 | if (issue_flags & IO_URING_F_NONBLOCK) | |
83 | return -EAGAIN; | |
84 | ||
85 | sock = sock_from_file(req->file); | |
86 | if (unlikely(!sock)) | |
87 | return -ENOTSOCK; | |
88 | ||
89 | ret = __sys_shutdown_sock(sock, shutdown->how); | |
90 | io_req_set_res(req, ret, 0); | |
91 | return IOU_OK; | |
92 | } | |
93 | ||
94 | static bool io_net_retry(struct socket *sock, int flags) | |
95 | { | |
96 | if (!(flags & MSG_WAITALL)) | |
97 | return false; | |
98 | return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; | |
99 | } | |
100 | ||
43e0bbbd JA |
101 | static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) |
102 | { | |
103 | struct io_async_msghdr *hdr = req->async_data; | |
104 | ||
105 | if (!hdr || issue_flags & IO_URING_F_UNLOCKED) | |
106 | return; | |
107 | ||
108 | /* Let normal cleanup path reap it if we fail adding to the cache */ | |
109 | if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { | |
110 | req->async_data = NULL; | |
111 | req->flags &= ~REQ_F_ASYNC_DATA; | |
112 | } | |
113 | } | |
114 | ||
115 | static struct io_async_msghdr *io_recvmsg_alloc_async(struct io_kiocb *req, | |
116 | unsigned int issue_flags) | |
117 | { | |
118 | struct io_ring_ctx *ctx = req->ctx; | |
119 | struct io_cache_entry *entry; | |
120 | ||
121 | if (!(issue_flags & IO_URING_F_UNLOCKED) && | |
122 | (entry = io_alloc_cache_get(&ctx->netmsg_cache)) != NULL) { | |
123 | struct io_async_msghdr *hdr; | |
124 | ||
125 | hdr = container_of(entry, struct io_async_msghdr, cache); | |
126 | req->flags |= REQ_F_ASYNC_DATA; | |
127 | req->async_data = hdr; | |
128 | return hdr; | |
129 | } | |
130 | ||
131 | if (!io_alloc_async_data(req)) | |
132 | return req->async_data; | |
133 | ||
134 | return NULL; | |
135 | } | |
136 | ||
f9ead18c | 137 | static int io_setup_async_msg(struct io_kiocb *req, |
43e0bbbd JA |
138 | struct io_async_msghdr *kmsg, |
139 | unsigned int issue_flags) | |
f9ead18c JA |
140 | { |
141 | struct io_async_msghdr *async_msg = req->async_data; | |
142 | ||
143 | if (async_msg) | |
144 | return -EAGAIN; | |
43e0bbbd JA |
145 | async_msg = io_recvmsg_alloc_async(req, issue_flags); |
146 | if (!async_msg) { | |
f9ead18c JA |
147 | kfree(kmsg->free_iov); |
148 | return -ENOMEM; | |
149 | } | |
f9ead18c JA |
150 | req->flags |= REQ_F_NEED_CLEANUP; |
151 | memcpy(async_msg, kmsg, sizeof(*kmsg)); | |
152 | async_msg->msg.msg_name = &async_msg->addr; | |
153 | /* if were using fast_iov, set it to the new one */ | |
154 | if (!async_msg->free_iov) | |
155 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
156 | ||
157 | return -EAGAIN; | |
158 | } | |
159 | ||
160 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, | |
161 | struct io_async_msghdr *iomsg) | |
162 | { | |
163 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
164 | ||
165 | iomsg->msg.msg_name = &iomsg->addr; | |
166 | iomsg->free_iov = iomsg->fast_iov; | |
167 | return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, | |
168 | &iomsg->free_iov); | |
169 | } | |
170 | ||
171 | int io_sendmsg_prep_async(struct io_kiocb *req) | |
172 | { | |
173 | int ret; | |
174 | ||
175 | ret = io_sendmsg_copy_hdr(req, req->async_data); | |
176 | if (!ret) | |
177 | req->flags |= REQ_F_NEED_CLEANUP; | |
178 | return ret; | |
179 | } | |
180 | ||
181 | void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) | |
182 | { | |
183 | struct io_async_msghdr *io = req->async_data; | |
184 | ||
185 | kfree(io->free_iov); | |
186 | } | |
187 | ||
188 | int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
189 | { | |
190 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
191 | ||
192 | if (unlikely(sqe->file_index || sqe->addr2)) | |
193 | return -EINVAL; | |
194 | ||
195 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
196 | sr->len = READ_ONCE(sqe->len); | |
197 | sr->flags = READ_ONCE(sqe->ioprio); | |
198 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) | |
199 | return -EINVAL; | |
200 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
201 | if (sr->msg_flags & MSG_DONTWAIT) | |
202 | req->flags |= REQ_F_NOWAIT; | |
203 | ||
204 | #ifdef CONFIG_COMPAT | |
205 | if (req->ctx->compat) | |
206 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
207 | #endif | |
208 | sr->done_io = 0; | |
209 | return 0; | |
210 | } | |
211 | ||
212 | int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) | |
213 | { | |
214 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
215 | struct io_async_msghdr iomsg, *kmsg; | |
216 | struct socket *sock; | |
217 | unsigned flags; | |
218 | int min_ret = 0; | |
219 | int ret; | |
220 | ||
221 | sock = sock_from_file(req->file); | |
222 | if (unlikely(!sock)) | |
223 | return -ENOTSOCK; | |
224 | ||
225 | if (req_has_async_data(req)) { | |
226 | kmsg = req->async_data; | |
227 | } else { | |
228 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
229 | if (ret) | |
230 | return ret; | |
231 | kmsg = &iomsg; | |
232 | } | |
233 | ||
234 | if (!(req->flags & REQ_F_POLLED) && | |
235 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
43e0bbbd | 236 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
237 | |
238 | flags = sr->msg_flags; | |
239 | if (issue_flags & IO_URING_F_NONBLOCK) | |
240 | flags |= MSG_DONTWAIT; | |
241 | if (flags & MSG_WAITALL) | |
242 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
243 | ||
244 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); | |
245 | ||
246 | if (ret < min_ret) { | |
247 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
43e0bbbd | 248 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
249 | if (ret == -ERESTARTSYS) |
250 | ret = -EINTR; | |
251 | if (ret > 0 && io_net_retry(sock, flags)) { | |
252 | sr->done_io += ret; | |
253 | req->flags |= REQ_F_PARTIAL_IO; | |
43e0bbbd | 254 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
255 | } |
256 | req_set_fail(req); | |
257 | } | |
258 | /* fast path, check for non-NULL to avoid function call */ | |
259 | if (kmsg->free_iov) | |
260 | kfree(kmsg->free_iov); | |
261 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
43e0bbbd | 262 | io_netmsg_recycle(req, issue_flags); |
f9ead18c JA |
263 | if (ret >= 0) |
264 | ret += sr->done_io; | |
265 | else if (sr->done_io) | |
266 | ret = sr->done_io; | |
267 | io_req_set_res(req, ret, 0); | |
268 | return IOU_OK; | |
269 | } | |
270 | ||
271 | int io_send(struct io_kiocb *req, unsigned int issue_flags) | |
272 | { | |
273 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
274 | struct msghdr msg; | |
275 | struct iovec iov; | |
276 | struct socket *sock; | |
277 | unsigned flags; | |
278 | int min_ret = 0; | |
279 | int ret; | |
280 | ||
281 | if (!(req->flags & REQ_F_POLLED) && | |
282 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
283 | return -EAGAIN; | |
284 | ||
285 | sock = sock_from_file(req->file); | |
286 | if (unlikely(!sock)) | |
287 | return -ENOTSOCK; | |
288 | ||
289 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); | |
290 | if (unlikely(ret)) | |
291 | return ret; | |
292 | ||
293 | msg.msg_name = NULL; | |
294 | msg.msg_control = NULL; | |
295 | msg.msg_controllen = 0; | |
296 | msg.msg_namelen = 0; | |
297 | ||
298 | flags = sr->msg_flags; | |
299 | if (issue_flags & IO_URING_F_NONBLOCK) | |
300 | flags |= MSG_DONTWAIT; | |
301 | if (flags & MSG_WAITALL) | |
302 | min_ret = iov_iter_count(&msg.msg_iter); | |
303 | ||
304 | msg.msg_flags = flags; | |
305 | ret = sock_sendmsg(sock, &msg); | |
306 | if (ret < min_ret) { | |
307 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
308 | return -EAGAIN; | |
309 | if (ret == -ERESTARTSYS) | |
310 | ret = -EINTR; | |
311 | if (ret > 0 && io_net_retry(sock, flags)) { | |
312 | sr->len -= ret; | |
313 | sr->buf += ret; | |
314 | sr->done_io += ret; | |
315 | req->flags |= REQ_F_PARTIAL_IO; | |
316 | return -EAGAIN; | |
317 | } | |
318 | req_set_fail(req); | |
319 | } | |
320 | if (ret >= 0) | |
321 | ret += sr->done_io; | |
322 | else if (sr->done_io) | |
323 | ret = sr->done_io; | |
324 | io_req_set_res(req, ret, 0); | |
325 | return IOU_OK; | |
326 | } | |
327 | ||
328 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, | |
329 | struct io_async_msghdr *iomsg) | |
330 | { | |
331 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
332 | struct iovec __user *uiov; | |
333 | size_t iov_len; | |
334 | int ret; | |
335 | ||
336 | ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg, | |
337 | &iomsg->uaddr, &uiov, &iov_len); | |
338 | if (ret) | |
339 | return ret; | |
340 | ||
341 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
5702196e DY |
342 | if (iov_len == 0) { |
343 | sr->len = iomsg->fast_iov[0].iov_len = 0; | |
344 | iomsg->fast_iov[0].iov_base = NULL; | |
345 | iomsg->free_iov = NULL; | |
346 | } else if (iov_len > 1) { | |
f9ead18c | 347 | return -EINVAL; |
5702196e DY |
348 | } else { |
349 | if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov))) | |
350 | return -EFAULT; | |
351 | sr->len = iomsg->fast_iov[0].iov_len; | |
352 | iomsg->free_iov = NULL; | |
353 | } | |
f9ead18c JA |
354 | } else { |
355 | iomsg->free_iov = iomsg->fast_iov; | |
356 | ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV, | |
357 | &iomsg->free_iov, &iomsg->msg.msg_iter, | |
358 | false); | |
359 | if (ret > 0) | |
360 | ret = 0; | |
361 | } | |
362 | ||
363 | return ret; | |
364 | } | |
365 | ||
366 | #ifdef CONFIG_COMPAT | |
367 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
368 | struct io_async_msghdr *iomsg) | |
369 | { | |
370 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
371 | struct compat_iovec __user *uiov; | |
372 | compat_uptr_t ptr; | |
373 | compat_size_t len; | |
374 | int ret; | |
375 | ||
376 | ret = __get_compat_msghdr(&iomsg->msg, sr->umsg_compat, &iomsg->uaddr, | |
377 | &ptr, &len); | |
378 | if (ret) | |
379 | return ret; | |
380 | ||
381 | uiov = compat_ptr(ptr); | |
382 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
383 | compat_ssize_t clen; | |
384 | ||
385 | if (len > 1) | |
386 | return -EINVAL; | |
387 | if (!access_ok(uiov, sizeof(*uiov))) | |
388 | return -EFAULT; | |
389 | if (__get_user(clen, &uiov->iov_len)) | |
390 | return -EFAULT; | |
391 | if (clen < 0) | |
392 | return -EINVAL; | |
393 | sr->len = clen; | |
394 | iomsg->free_iov = NULL; | |
395 | } else { | |
396 | iomsg->free_iov = iomsg->fast_iov; | |
397 | ret = __import_iovec(READ, (struct iovec __user *)uiov, len, | |
398 | UIO_FASTIOV, &iomsg->free_iov, | |
399 | &iomsg->msg.msg_iter, true); | |
400 | if (ret < 0) | |
401 | return ret; | |
402 | } | |
403 | ||
404 | return 0; | |
405 | } | |
406 | #endif | |
407 | ||
408 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, | |
409 | struct io_async_msghdr *iomsg) | |
410 | { | |
411 | iomsg->msg.msg_name = &iomsg->addr; | |
412 | ||
413 | #ifdef CONFIG_COMPAT | |
414 | if (req->ctx->compat) | |
415 | return __io_compat_recvmsg_copy_hdr(req, iomsg); | |
416 | #endif | |
417 | ||
418 | return __io_recvmsg_copy_hdr(req, iomsg); | |
419 | } | |
420 | ||
421 | int io_recvmsg_prep_async(struct io_kiocb *req) | |
422 | { | |
423 | int ret; | |
424 | ||
425 | ret = io_recvmsg_copy_hdr(req, req->async_data); | |
426 | if (!ret) | |
427 | req->flags |= REQ_F_NEED_CLEANUP; | |
428 | return ret; | |
429 | } | |
430 | ||
b3fdea6e DY |
431 | #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) |
432 | ||
f9ead18c JA |
433 | int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
434 | { | |
435 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
436 | ||
437 | if (unlikely(sqe->file_index || sqe->addr2)) | |
438 | return -EINVAL; | |
439 | ||
440 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
441 | sr->len = READ_ONCE(sqe->len); | |
442 | sr->flags = READ_ONCE(sqe->ioprio); | |
b3fdea6e | 443 | if (sr->flags & ~(RECVMSG_FLAGS)) |
f9ead18c JA |
444 | return -EINVAL; |
445 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
446 | if (sr->msg_flags & MSG_DONTWAIT) | |
447 | req->flags |= REQ_F_NOWAIT; | |
448 | if (sr->msg_flags & MSG_ERRQUEUE) | |
449 | req->flags |= REQ_F_CLEAR_POLLIN; | |
b3fdea6e | 450 | if (sr->flags & IORING_RECV_MULTISHOT) { |
cf0dd952 DY |
451 | if (req->opcode == IORING_OP_RECVMSG) |
452 | return -EINVAL; | |
b3fdea6e DY |
453 | if (!(req->flags & REQ_F_BUFFER_SELECT)) |
454 | return -EINVAL; | |
455 | if (sr->msg_flags & MSG_WAITALL) | |
456 | return -EINVAL; | |
457 | if (req->opcode == IORING_OP_RECV && sr->len) | |
458 | return -EINVAL; | |
459 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
460 | } | |
f9ead18c JA |
461 | |
462 | #ifdef CONFIG_COMPAT | |
463 | if (req->ctx->compat) | |
464 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
465 | #endif | |
466 | sr->done_io = 0; | |
467 | return 0; | |
468 | } | |
469 | ||
b3fdea6e DY |
470 | static inline void io_recv_prep_retry(struct io_kiocb *req) |
471 | { | |
472 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
473 | ||
474 | sr->done_io = 0; | |
475 | sr->len = 0; /* get from the provided buffer */ | |
476 | } | |
477 | ||
478 | /* | |
cf0dd952 | 479 | * Finishes io_recv |
b3fdea6e DY |
480 | * |
481 | * Returns true if it is actually finished, or false if it should run | |
482 | * again (for multishot). | |
483 | */ | |
484 | static inline bool io_recv_finish(struct io_kiocb *req, int *ret, unsigned int cflags) | |
485 | { | |
486 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
487 | io_req_set_res(req, *ret, cflags); | |
488 | *ret = IOU_OK; | |
489 | return true; | |
490 | } | |
491 | ||
492 | if (*ret > 0) { | |
493 | if (io_post_aux_cqe(req->ctx, req->cqe.user_data, *ret, | |
494 | cflags | IORING_CQE_F_MORE, false)) { | |
495 | io_recv_prep_retry(req); | |
496 | return false; | |
497 | } | |
498 | /* | |
499 | * Otherwise stop multishot but use the current result. | |
500 | * Probably will end up going into overflow, but this means | |
501 | * we cannot trust the ordering anymore | |
502 | */ | |
503 | } | |
504 | ||
505 | io_req_set_res(req, *ret, cflags); | |
506 | ||
507 | if (req->flags & REQ_F_POLLED) | |
508 | *ret = IOU_STOP_MULTISHOT; | |
e2df2ccb DY |
509 | else |
510 | *ret = IOU_OK; | |
b3fdea6e DY |
511 | return true; |
512 | } | |
513 | ||
f9ead18c JA |
514 | int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
515 | { | |
516 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
517 | struct io_async_msghdr iomsg, *kmsg; | |
518 | struct socket *sock; | |
519 | unsigned int cflags; | |
520 | unsigned flags; | |
521 | int ret, min_ret = 0; | |
522 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
523 | ||
524 | sock = sock_from_file(req->file); | |
525 | if (unlikely(!sock)) | |
526 | return -ENOTSOCK; | |
527 | ||
528 | if (req_has_async_data(req)) { | |
529 | kmsg = req->async_data; | |
530 | } else { | |
531 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
532 | if (ret) | |
533 | return ret; | |
534 | kmsg = &iomsg; | |
535 | } | |
536 | ||
537 | if (!(req->flags & REQ_F_POLLED) && | |
538 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
43e0bbbd | 539 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
540 | |
541 | if (io_do_buffer_select(req)) { | |
542 | void __user *buf; | |
543 | ||
cf0dd952 | 544 | buf = io_buffer_select(req, &sr->len, issue_flags); |
f9ead18c JA |
545 | if (!buf) |
546 | return -ENOBUFS; | |
547 | kmsg->fast_iov[0].iov_base = buf; | |
cf0dd952 | 548 | kmsg->fast_iov[0].iov_len = sr->len; |
f9ead18c | 549 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, 1, |
cf0dd952 | 550 | sr->len); |
f9ead18c JA |
551 | } |
552 | ||
553 | flags = sr->msg_flags; | |
554 | if (force_nonblock) | |
555 | flags |= MSG_DONTWAIT; | |
556 | if (flags & MSG_WAITALL) | |
557 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
558 | ||
559 | kmsg->msg.msg_get_inq = 1; | |
560 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, kmsg->uaddr, flags); | |
561 | if (ret < min_ret) { | |
cf0dd952 | 562 | if (ret == -EAGAIN && force_nonblock) |
43e0bbbd | 563 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
564 | if (ret == -ERESTARTSYS) |
565 | ret = -EINTR; | |
566 | if (ret > 0 && io_net_retry(sock, flags)) { | |
567 | sr->done_io += ret; | |
568 | req->flags |= REQ_F_PARTIAL_IO; | |
43e0bbbd | 569 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
570 | } |
571 | req_set_fail(req); | |
572 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
573 | req_set_fail(req); | |
574 | } | |
575 | ||
576 | /* fast path, check for non-NULL to avoid function call */ | |
577 | if (kmsg->free_iov) | |
578 | kfree(kmsg->free_iov); | |
43e0bbbd | 579 | io_netmsg_recycle(req, issue_flags); |
f9ead18c | 580 | req->flags &= ~REQ_F_NEED_CLEANUP; |
d4e097da | 581 | if (ret > 0) |
f9ead18c JA |
582 | ret += sr->done_io; |
583 | else if (sr->done_io) | |
584 | ret = sr->done_io; | |
d4e097da DY |
585 | else |
586 | io_kbuf_recycle(req, issue_flags); | |
587 | ||
f9ead18c JA |
588 | cflags = io_put_kbuf(req, issue_flags); |
589 | if (kmsg->msg.msg_inq) | |
590 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; | |
b3fdea6e | 591 | |
cf0dd952 DY |
592 | io_req_set_res(req, ret, cflags); |
593 | return IOU_OK; | |
f9ead18c JA |
594 | } |
595 | ||
596 | int io_recv(struct io_kiocb *req, unsigned int issue_flags) | |
597 | { | |
598 | struct io_sr_msg *sr = io_kiocb_to_cmd(req); | |
599 | struct msghdr msg; | |
600 | struct socket *sock; | |
601 | struct iovec iov; | |
602 | unsigned int cflags; | |
603 | unsigned flags; | |
604 | int ret, min_ret = 0; | |
605 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
b3fdea6e | 606 | size_t len = sr->len; |
f9ead18c JA |
607 | |
608 | if (!(req->flags & REQ_F_POLLED) && | |
609 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
610 | return -EAGAIN; | |
611 | ||
612 | sock = sock_from_file(req->file); | |
613 | if (unlikely(!sock)) | |
614 | return -ENOTSOCK; | |
615 | ||
b3fdea6e | 616 | retry_multishot: |
f9ead18c JA |
617 | if (io_do_buffer_select(req)) { |
618 | void __user *buf; | |
619 | ||
b3fdea6e | 620 | buf = io_buffer_select(req, &len, issue_flags); |
f9ead18c JA |
621 | if (!buf) |
622 | return -ENOBUFS; | |
623 | sr->buf = buf; | |
624 | } | |
625 | ||
b3fdea6e | 626 | ret = import_single_range(READ, sr->buf, len, &iov, &msg.msg_iter); |
f9ead18c JA |
627 | if (unlikely(ret)) |
628 | goto out_free; | |
629 | ||
630 | msg.msg_name = NULL; | |
631 | msg.msg_namelen = 0; | |
632 | msg.msg_control = NULL; | |
633 | msg.msg_get_inq = 1; | |
634 | msg.msg_flags = 0; | |
635 | msg.msg_controllen = 0; | |
636 | msg.msg_iocb = NULL; | |
637 | ||
638 | flags = sr->msg_flags; | |
639 | if (force_nonblock) | |
640 | flags |= MSG_DONTWAIT; | |
641 | if (flags & MSG_WAITALL) | |
642 | min_ret = iov_iter_count(&msg.msg_iter); | |
643 | ||
644 | ret = sock_recvmsg(sock, &msg, flags); | |
645 | if (ret < min_ret) { | |
b3fdea6e DY |
646 | if (ret == -EAGAIN && force_nonblock) { |
647 | if ((req->flags & IO_APOLL_MULTI_POLLED) == IO_APOLL_MULTI_POLLED) { | |
648 | io_kbuf_recycle(req, issue_flags); | |
649 | return IOU_ISSUE_SKIP_COMPLETE; | |
650 | } | |
651 | ||
f9ead18c | 652 | return -EAGAIN; |
b3fdea6e | 653 | } |
f9ead18c JA |
654 | if (ret == -ERESTARTSYS) |
655 | ret = -EINTR; | |
656 | if (ret > 0 && io_net_retry(sock, flags)) { | |
657 | sr->len -= ret; | |
658 | sr->buf += ret; | |
659 | sr->done_io += ret; | |
660 | req->flags |= REQ_F_PARTIAL_IO; | |
661 | return -EAGAIN; | |
662 | } | |
663 | req_set_fail(req); | |
664 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
665 | out_free: | |
666 | req_set_fail(req); | |
667 | } | |
668 | ||
d4e097da | 669 | if (ret > 0) |
f9ead18c JA |
670 | ret += sr->done_io; |
671 | else if (sr->done_io) | |
672 | ret = sr->done_io; | |
d4e097da DY |
673 | else |
674 | io_kbuf_recycle(req, issue_flags); | |
675 | ||
f9ead18c JA |
676 | cflags = io_put_kbuf(req, issue_flags); |
677 | if (msg.msg_inq) | |
678 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; | |
b3fdea6e DY |
679 | |
680 | if (!io_recv_finish(req, &ret, cflags)) | |
681 | goto retry_multishot; | |
682 | ||
683 | return ret; | |
f9ead18c JA |
684 | } |
685 | ||
686 | int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
687 | { | |
688 | struct io_accept *accept = io_kiocb_to_cmd(req); | |
689 | unsigned flags; | |
690 | ||
691 | if (sqe->len || sqe->buf_index) | |
692 | return -EINVAL; | |
693 | ||
694 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
695 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
696 | accept->flags = READ_ONCE(sqe->accept_flags); | |
697 | accept->nofile = rlimit(RLIMIT_NOFILE); | |
698 | flags = READ_ONCE(sqe->ioprio); | |
699 | if (flags & ~IORING_ACCEPT_MULTISHOT) | |
700 | return -EINVAL; | |
701 | ||
702 | accept->file_slot = READ_ONCE(sqe->file_index); | |
703 | if (accept->file_slot) { | |
704 | if (accept->flags & SOCK_CLOEXEC) | |
705 | return -EINVAL; | |
706 | if (flags & IORING_ACCEPT_MULTISHOT && | |
707 | accept->file_slot != IORING_FILE_INDEX_ALLOC) | |
708 | return -EINVAL; | |
709 | } | |
710 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
711 | return -EINVAL; | |
712 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
713 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
714 | if (flags & IORING_ACCEPT_MULTISHOT) | |
715 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
716 | return 0; | |
717 | } | |
718 | ||
719 | int io_accept(struct io_kiocb *req, unsigned int issue_flags) | |
720 | { | |
721 | struct io_ring_ctx *ctx = req->ctx; | |
722 | struct io_accept *accept = io_kiocb_to_cmd(req); | |
723 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
724 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; | |
725 | bool fixed = !!accept->file_slot; | |
726 | struct file *file; | |
727 | int ret, fd; | |
728 | ||
729 | retry: | |
730 | if (!fixed) { | |
731 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
732 | if (unlikely(fd < 0)) | |
733 | return fd; | |
734 | } | |
735 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, | |
736 | accept->flags); | |
737 | if (IS_ERR(file)) { | |
738 | if (!fixed) | |
739 | put_unused_fd(fd); | |
740 | ret = PTR_ERR(file); | |
741 | if (ret == -EAGAIN && force_nonblock) { | |
742 | /* | |
743 | * if it's multishot and polled, we don't need to | |
744 | * return EAGAIN to arm the poll infra since it | |
745 | * has already been done | |
746 | */ | |
747 | if ((req->flags & IO_APOLL_MULTI_POLLED) == | |
748 | IO_APOLL_MULTI_POLLED) | |
749 | ret = IOU_ISSUE_SKIP_COMPLETE; | |
750 | return ret; | |
751 | } | |
752 | if (ret == -ERESTARTSYS) | |
753 | ret = -EINTR; | |
754 | req_set_fail(req); | |
755 | } else if (!fixed) { | |
756 | fd_install(fd, file); | |
757 | ret = fd; | |
758 | } else { | |
759 | ret = io_fixed_fd_install(req, issue_flags, file, | |
760 | accept->file_slot); | |
761 | } | |
762 | ||
763 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
764 | io_req_set_res(req, ret, 0); | |
765 | return IOU_OK; | |
766 | } | |
f9ead18c | 767 | |
cbd25748 DY |
768 | if (ret >= 0 && |
769 | io_post_aux_cqe(ctx, req->cqe.user_data, ret, IORING_CQE_F_MORE, false)) | |
d245bca6 | 770 | goto retry; |
cbd25748 DY |
771 | |
772 | io_req_set_res(req, ret, 0); | |
773 | if (req->flags & REQ_F_POLLED) | |
774 | return IOU_STOP_MULTISHOT; | |
775 | return IOU_OK; | |
f9ead18c JA |
776 | } |
777 | ||
778 | int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
779 | { | |
780 | struct io_socket *sock = io_kiocb_to_cmd(req); | |
781 | ||
782 | if (sqe->addr || sqe->rw_flags || sqe->buf_index) | |
783 | return -EINVAL; | |
784 | ||
785 | sock->domain = READ_ONCE(sqe->fd); | |
786 | sock->type = READ_ONCE(sqe->off); | |
787 | sock->protocol = READ_ONCE(sqe->len); | |
788 | sock->file_slot = READ_ONCE(sqe->file_index); | |
789 | sock->nofile = rlimit(RLIMIT_NOFILE); | |
790 | ||
791 | sock->flags = sock->type & ~SOCK_TYPE_MASK; | |
792 | if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) | |
793 | return -EINVAL; | |
794 | if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
795 | return -EINVAL; | |
796 | return 0; | |
797 | } | |
798 | ||
799 | int io_socket(struct io_kiocb *req, unsigned int issue_flags) | |
800 | { | |
801 | struct io_socket *sock = io_kiocb_to_cmd(req); | |
802 | bool fixed = !!sock->file_slot; | |
803 | struct file *file; | |
804 | int ret, fd; | |
805 | ||
806 | if (!fixed) { | |
807 | fd = __get_unused_fd_flags(sock->flags, sock->nofile); | |
808 | if (unlikely(fd < 0)) | |
809 | return fd; | |
810 | } | |
811 | file = __sys_socket_file(sock->domain, sock->type, sock->protocol); | |
812 | if (IS_ERR(file)) { | |
813 | if (!fixed) | |
814 | put_unused_fd(fd); | |
815 | ret = PTR_ERR(file); | |
816 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
817 | return -EAGAIN; | |
818 | if (ret == -ERESTARTSYS) | |
819 | ret = -EINTR; | |
820 | req_set_fail(req); | |
821 | } else if (!fixed) { | |
822 | fd_install(fd, file); | |
823 | ret = fd; | |
824 | } else { | |
825 | ret = io_fixed_fd_install(req, issue_flags, file, | |
826 | sock->file_slot); | |
827 | } | |
828 | io_req_set_res(req, ret, 0); | |
829 | return IOU_OK; | |
830 | } | |
831 | ||
832 | int io_connect_prep_async(struct io_kiocb *req) | |
833 | { | |
834 | struct io_async_connect *io = req->async_data; | |
835 | struct io_connect *conn = io_kiocb_to_cmd(req); | |
836 | ||
837 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
838 | } | |
839 | ||
840 | int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
841 | { | |
842 | struct io_connect *conn = io_kiocb_to_cmd(req); | |
843 | ||
844 | if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) | |
845 | return -EINVAL; | |
846 | ||
847 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
848 | conn->addr_len = READ_ONCE(sqe->addr2); | |
849 | return 0; | |
850 | } | |
851 | ||
852 | int io_connect(struct io_kiocb *req, unsigned int issue_flags) | |
853 | { | |
854 | struct io_connect *connect = io_kiocb_to_cmd(req); | |
855 | struct io_async_connect __io, *io; | |
856 | unsigned file_flags; | |
857 | int ret; | |
858 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
859 | ||
860 | if (req_has_async_data(req)) { | |
861 | io = req->async_data; | |
862 | } else { | |
863 | ret = move_addr_to_kernel(connect->addr, | |
864 | connect->addr_len, | |
865 | &__io.address); | |
866 | if (ret) | |
867 | goto out; | |
868 | io = &__io; | |
869 | } | |
870 | ||
871 | file_flags = force_nonblock ? O_NONBLOCK : 0; | |
872 | ||
873 | ret = __sys_connect_file(req->file, &io->address, | |
874 | connect->addr_len, file_flags); | |
875 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { | |
876 | if (req_has_async_data(req)) | |
877 | return -EAGAIN; | |
878 | if (io_alloc_async_data(req)) { | |
879 | ret = -ENOMEM; | |
880 | goto out; | |
881 | } | |
882 | memcpy(req->async_data, &__io, sizeof(__io)); | |
883 | return -EAGAIN; | |
884 | } | |
885 | if (ret == -ERESTARTSYS) | |
886 | ret = -EINTR; | |
887 | out: | |
888 | if (ret < 0) | |
889 | req_set_fail(req); | |
890 | io_req_set_res(req, ret, 0); | |
891 | return IOU_OK; | |
892 | } | |
43e0bbbd JA |
893 | |
894 | void io_netmsg_cache_free(struct io_cache_entry *entry) | |
895 | { | |
896 | kfree(container_of(entry, struct io_async_msghdr, cache)); | |
897 | } | |
f9ead18c | 898 | #endif |