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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 | 16 | #include "net.h" |
06a5464b | 17 | #include "notif.h" |
10c7d33e | 18 | #include "rsrc.h" |
f9ead18c JA |
19 | |
20 | #if defined(CONFIG_NET) | |
21 | struct io_shutdown { | |
22 | struct file *file; | |
23 | int how; | |
24 | }; | |
25 | ||
26 | struct io_accept { | |
27 | struct file *file; | |
28 | struct sockaddr __user *addr; | |
29 | int __user *addr_len; | |
30 | int flags; | |
31 | u32 file_slot; | |
32 | unsigned long nofile; | |
33 | }; | |
34 | ||
35 | struct io_socket { | |
36 | struct file *file; | |
37 | int domain; | |
38 | int type; | |
39 | int protocol; | |
40 | int flags; | |
41 | u32 file_slot; | |
42 | unsigned long nofile; | |
43 | }; | |
44 | ||
45 | struct io_connect { | |
46 | struct file *file; | |
47 | struct sockaddr __user *addr; | |
48 | int addr_len; | |
49 | }; | |
50 | ||
51 | struct io_sr_msg { | |
52 | struct file *file; | |
53 | union { | |
54 | struct compat_msghdr __user *umsg_compat; | |
55 | struct user_msghdr __user *umsg; | |
56 | void __user *buf; | |
57 | }; | |
293402e5 PB |
58 | unsigned msg_flags; |
59 | unsigned flags; | |
f9ead18c JA |
60 | size_t len; |
61 | size_t done_io; | |
f9ead18c JA |
62 | }; |
63 | ||
06a5464b PB |
64 | struct io_sendzc { |
65 | struct file *file; | |
66 | void __user *buf; | |
67 | size_t len; | |
68 | u16 slot_idx; | |
69 | unsigned msg_flags; | |
70 | unsigned flags; | |
092aeedb PB |
71 | unsigned addr_len; |
72 | void __user *addr; | |
4a933e62 | 73 | size_t done_io; |
06a5464b PB |
74 | }; |
75 | ||
f9ead18c JA |
76 | #define IO_APOLL_MULTI_POLLED (REQ_F_APOLL_MULTISHOT | REQ_F_POLLED) |
77 | ||
78 | int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
79 | { | |
f2ccb5ae | 80 | struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); |
f9ead18c JA |
81 | |
82 | if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || | |
83 | sqe->buf_index || sqe->splice_fd_in)) | |
84 | return -EINVAL; | |
85 | ||
86 | shutdown->how = READ_ONCE(sqe->len); | |
87 | return 0; | |
88 | } | |
89 | ||
90 | int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) | |
91 | { | |
f2ccb5ae | 92 | struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); |
f9ead18c JA |
93 | struct socket *sock; |
94 | int ret; | |
95 | ||
96 | if (issue_flags & IO_URING_F_NONBLOCK) | |
97 | return -EAGAIN; | |
98 | ||
99 | sock = sock_from_file(req->file); | |
100 | if (unlikely(!sock)) | |
101 | return -ENOTSOCK; | |
102 | ||
103 | ret = __sys_shutdown_sock(sock, shutdown->how); | |
104 | io_req_set_res(req, ret, 0); | |
105 | return IOU_OK; | |
106 | } | |
107 | ||
108 | static bool io_net_retry(struct socket *sock, int flags) | |
109 | { | |
110 | if (!(flags & MSG_WAITALL)) | |
111 | return false; | |
112 | return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; | |
113 | } | |
114 | ||
43e0bbbd JA |
115 | static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) |
116 | { | |
117 | struct io_async_msghdr *hdr = req->async_data; | |
118 | ||
119 | if (!hdr || issue_flags & IO_URING_F_UNLOCKED) | |
120 | return; | |
121 | ||
122 | /* Let normal cleanup path reap it if we fail adding to the cache */ | |
123 | if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { | |
124 | req->async_data = NULL; | |
125 | req->flags &= ~REQ_F_ASYNC_DATA; | |
126 | } | |
127 | } | |
128 | ||
129 | static struct io_async_msghdr *io_recvmsg_alloc_async(struct io_kiocb *req, | |
130 | unsigned int issue_flags) | |
131 | { | |
132 | struct io_ring_ctx *ctx = req->ctx; | |
133 | struct io_cache_entry *entry; | |
134 | ||
135 | if (!(issue_flags & IO_URING_F_UNLOCKED) && | |
136 | (entry = io_alloc_cache_get(&ctx->netmsg_cache)) != NULL) { | |
137 | struct io_async_msghdr *hdr; | |
138 | ||
139 | hdr = container_of(entry, struct io_async_msghdr, cache); | |
140 | req->flags |= REQ_F_ASYNC_DATA; | |
141 | req->async_data = hdr; | |
142 | return hdr; | |
143 | } | |
144 | ||
145 | if (!io_alloc_async_data(req)) | |
146 | return req->async_data; | |
147 | ||
148 | return NULL; | |
149 | } | |
150 | ||
f9ead18c | 151 | static int io_setup_async_msg(struct io_kiocb *req, |
43e0bbbd JA |
152 | struct io_async_msghdr *kmsg, |
153 | unsigned int issue_flags) | |
f9ead18c JA |
154 | { |
155 | struct io_async_msghdr *async_msg = req->async_data; | |
156 | ||
157 | if (async_msg) | |
158 | return -EAGAIN; | |
43e0bbbd JA |
159 | async_msg = io_recvmsg_alloc_async(req, issue_flags); |
160 | if (!async_msg) { | |
f9ead18c JA |
161 | kfree(kmsg->free_iov); |
162 | return -ENOMEM; | |
163 | } | |
f9ead18c JA |
164 | req->flags |= REQ_F_NEED_CLEANUP; |
165 | memcpy(async_msg, kmsg, sizeof(*kmsg)); | |
166 | async_msg->msg.msg_name = &async_msg->addr; | |
167 | /* if were using fast_iov, set it to the new one */ | |
168 | if (!async_msg->free_iov) | |
169 | async_msg->msg.msg_iter.iov = async_msg->fast_iov; | |
170 | ||
171 | return -EAGAIN; | |
172 | } | |
173 | ||
174 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, | |
175 | struct io_async_msghdr *iomsg) | |
176 | { | |
f2ccb5ae | 177 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
178 | |
179 | iomsg->msg.msg_name = &iomsg->addr; | |
180 | iomsg->free_iov = iomsg->fast_iov; | |
181 | return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, | |
182 | &iomsg->free_iov); | |
183 | } | |
184 | ||
185 | int io_sendmsg_prep_async(struct io_kiocb *req) | |
186 | { | |
187 | int ret; | |
188 | ||
189 | ret = io_sendmsg_copy_hdr(req, req->async_data); | |
190 | if (!ret) | |
191 | req->flags |= REQ_F_NEED_CLEANUP; | |
192 | return ret; | |
193 | } | |
194 | ||
195 | void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) | |
196 | { | |
197 | struct io_async_msghdr *io = req->async_data; | |
198 | ||
199 | kfree(io->free_iov); | |
200 | } | |
201 | ||
202 | int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
203 | { | |
f2ccb5ae | 204 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
205 | |
206 | if (unlikely(sqe->file_index || sqe->addr2)) | |
207 | return -EINVAL; | |
208 | ||
209 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
210 | sr->len = READ_ONCE(sqe->len); | |
211 | sr->flags = READ_ONCE(sqe->ioprio); | |
212 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) | |
213 | return -EINVAL; | |
214 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
215 | if (sr->msg_flags & MSG_DONTWAIT) | |
216 | req->flags |= REQ_F_NOWAIT; | |
217 | ||
218 | #ifdef CONFIG_COMPAT | |
219 | if (req->ctx->compat) | |
220 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
221 | #endif | |
222 | sr->done_io = 0; | |
223 | return 0; | |
224 | } | |
225 | ||
226 | int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) | |
227 | { | |
f2ccb5ae | 228 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
229 | struct io_async_msghdr iomsg, *kmsg; |
230 | struct socket *sock; | |
231 | unsigned flags; | |
232 | int min_ret = 0; | |
233 | int ret; | |
234 | ||
235 | sock = sock_from_file(req->file); | |
236 | if (unlikely(!sock)) | |
237 | return -ENOTSOCK; | |
238 | ||
239 | if (req_has_async_data(req)) { | |
240 | kmsg = req->async_data; | |
241 | } else { | |
242 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
243 | if (ret) | |
244 | return ret; | |
245 | kmsg = &iomsg; | |
246 | } | |
247 | ||
248 | if (!(req->flags & REQ_F_POLLED) && | |
249 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
43e0bbbd | 250 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
251 | |
252 | flags = sr->msg_flags; | |
253 | if (issue_flags & IO_URING_F_NONBLOCK) | |
254 | flags |= MSG_DONTWAIT; | |
255 | if (flags & MSG_WAITALL) | |
256 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
257 | ||
258 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); | |
259 | ||
260 | if (ret < min_ret) { | |
261 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
43e0bbbd | 262 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
263 | if (ret == -ERESTARTSYS) |
264 | ret = -EINTR; | |
265 | if (ret > 0 && io_net_retry(sock, flags)) { | |
266 | sr->done_io += ret; | |
267 | req->flags |= REQ_F_PARTIAL_IO; | |
43e0bbbd | 268 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
269 | } |
270 | req_set_fail(req); | |
271 | } | |
272 | /* fast path, check for non-NULL to avoid function call */ | |
273 | if (kmsg->free_iov) | |
274 | kfree(kmsg->free_iov); | |
275 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
43e0bbbd | 276 | io_netmsg_recycle(req, issue_flags); |
f9ead18c JA |
277 | if (ret >= 0) |
278 | ret += sr->done_io; | |
279 | else if (sr->done_io) | |
280 | ret = sr->done_io; | |
281 | io_req_set_res(req, ret, 0); | |
282 | return IOU_OK; | |
283 | } | |
284 | ||
285 | int io_send(struct io_kiocb *req, unsigned int issue_flags) | |
286 | { | |
f2ccb5ae | 287 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
288 | struct msghdr msg; |
289 | struct iovec iov; | |
290 | struct socket *sock; | |
291 | unsigned flags; | |
292 | int min_ret = 0; | |
293 | int ret; | |
294 | ||
295 | if (!(req->flags & REQ_F_POLLED) && | |
296 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
297 | return -EAGAIN; | |
298 | ||
299 | sock = sock_from_file(req->file); | |
300 | if (unlikely(!sock)) | |
301 | return -ENOTSOCK; | |
302 | ||
303 | ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); | |
304 | if (unlikely(ret)) | |
305 | return ret; | |
306 | ||
307 | msg.msg_name = NULL; | |
308 | msg.msg_control = NULL; | |
309 | msg.msg_controllen = 0; | |
310 | msg.msg_namelen = 0; | |
e02b6651 | 311 | msg.msg_ubuf = NULL; |
f9ead18c JA |
312 | |
313 | flags = sr->msg_flags; | |
314 | if (issue_flags & IO_URING_F_NONBLOCK) | |
315 | flags |= MSG_DONTWAIT; | |
316 | if (flags & MSG_WAITALL) | |
317 | min_ret = iov_iter_count(&msg.msg_iter); | |
318 | ||
319 | msg.msg_flags = flags; | |
320 | ret = sock_sendmsg(sock, &msg); | |
321 | if (ret < min_ret) { | |
322 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
323 | return -EAGAIN; | |
324 | if (ret == -ERESTARTSYS) | |
325 | ret = -EINTR; | |
326 | if (ret > 0 && io_net_retry(sock, flags)) { | |
327 | sr->len -= ret; | |
328 | sr->buf += ret; | |
329 | sr->done_io += ret; | |
330 | req->flags |= REQ_F_PARTIAL_IO; | |
331 | return -EAGAIN; | |
332 | } | |
333 | req_set_fail(req); | |
334 | } | |
335 | if (ret >= 0) | |
336 | ret += sr->done_io; | |
337 | else if (sr->done_io) | |
338 | ret = sr->done_io; | |
339 | io_req_set_res(req, ret, 0); | |
340 | return IOU_OK; | |
341 | } | |
342 | ||
9bb66906 DY |
343 | static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) |
344 | { | |
9b0fc3c0 | 345 | int hdr; |
9bb66906 | 346 | |
9b0fc3c0 | 347 | if (iomsg->namelen < 0) |
9bb66906 | 348 | return true; |
9b0fc3c0 DY |
349 | if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), |
350 | iomsg->namelen, &hdr)) | |
9bb66906 | 351 | return true; |
9b0fc3c0 | 352 | if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) |
9bb66906 DY |
353 | return true; |
354 | ||
355 | return false; | |
356 | } | |
357 | ||
f9ead18c JA |
358 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
359 | struct io_async_msghdr *iomsg) | |
360 | { | |
f2ccb5ae | 361 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
7fa875b8 | 362 | struct user_msghdr msg; |
f9ead18c JA |
363 | int ret; |
364 | ||
7fa875b8 DY |
365 | if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) |
366 | return -EFAULT; | |
367 | ||
368 | ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); | |
f9ead18c JA |
369 | if (ret) |
370 | return ret; | |
371 | ||
372 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
7fa875b8 | 373 | if (msg.msg_iovlen == 0) { |
5702196e DY |
374 | sr->len = iomsg->fast_iov[0].iov_len = 0; |
375 | iomsg->fast_iov[0].iov_base = NULL; | |
376 | iomsg->free_iov = NULL; | |
7fa875b8 | 377 | } else if (msg.msg_iovlen > 1) { |
f9ead18c | 378 | return -EINVAL; |
5702196e | 379 | } else { |
7fa875b8 | 380 | if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) |
5702196e DY |
381 | return -EFAULT; |
382 | sr->len = iomsg->fast_iov[0].iov_len; | |
383 | iomsg->free_iov = NULL; | |
384 | } | |
9bb66906 DY |
385 | |
386 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
387 | iomsg->namelen = msg.msg_namelen; | |
388 | iomsg->controllen = msg.msg_controllen; | |
389 | if (io_recvmsg_multishot_overflow(iomsg)) | |
390 | return -EOVERFLOW; | |
391 | } | |
f9ead18c JA |
392 | } else { |
393 | iomsg->free_iov = iomsg->fast_iov; | |
7fa875b8 | 394 | ret = __import_iovec(READ, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, |
f9ead18c JA |
395 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
396 | false); | |
397 | if (ret > 0) | |
398 | ret = 0; | |
399 | } | |
400 | ||
401 | return ret; | |
402 | } | |
403 | ||
404 | #ifdef CONFIG_COMPAT | |
405 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
406 | struct io_async_msghdr *iomsg) | |
407 | { | |
f2ccb5ae | 408 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
72c531f8 | 409 | struct compat_msghdr msg; |
f9ead18c | 410 | struct compat_iovec __user *uiov; |
f9ead18c JA |
411 | int ret; |
412 | ||
72c531f8 DY |
413 | if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) |
414 | return -EFAULT; | |
415 | ||
4f6a94d3 | 416 | ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); |
f9ead18c JA |
417 | if (ret) |
418 | return ret; | |
419 | ||
72c531f8 | 420 | uiov = compat_ptr(msg.msg_iov); |
f9ead18c JA |
421 | if (req->flags & REQ_F_BUFFER_SELECT) { |
422 | compat_ssize_t clen; | |
423 | ||
72c531f8 | 424 | if (msg.msg_iovlen == 0) { |
6d2f75a0 DY |
425 | sr->len = 0; |
426 | iomsg->free_iov = NULL; | |
72c531f8 | 427 | } else if (msg.msg_iovlen > 1) { |
f9ead18c | 428 | return -EINVAL; |
6d2f75a0 DY |
429 | } else { |
430 | if (!access_ok(uiov, sizeof(*uiov))) | |
431 | return -EFAULT; | |
432 | if (__get_user(clen, &uiov->iov_len)) | |
433 | return -EFAULT; | |
434 | if (clen < 0) | |
435 | return -EINVAL; | |
436 | sr->len = clen; | |
437 | iomsg->free_iov = NULL; | |
438 | } | |
9bb66906 DY |
439 | |
440 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
441 | iomsg->namelen = msg.msg_namelen; | |
442 | iomsg->controllen = msg.msg_controllen; | |
443 | if (io_recvmsg_multishot_overflow(iomsg)) | |
444 | return -EOVERFLOW; | |
445 | } | |
f9ead18c JA |
446 | } else { |
447 | iomsg->free_iov = iomsg->fast_iov; | |
72c531f8 | 448 | ret = __import_iovec(READ, (struct iovec __user *)uiov, msg.msg_iovlen, |
f9ead18c JA |
449 | UIO_FASTIOV, &iomsg->free_iov, |
450 | &iomsg->msg.msg_iter, true); | |
451 | if (ret < 0) | |
452 | return ret; | |
453 | } | |
454 | ||
455 | return 0; | |
456 | } | |
457 | #endif | |
458 | ||
459 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, | |
460 | struct io_async_msghdr *iomsg) | |
461 | { | |
462 | iomsg->msg.msg_name = &iomsg->addr; | |
463 | ||
464 | #ifdef CONFIG_COMPAT | |
465 | if (req->ctx->compat) | |
466 | return __io_compat_recvmsg_copy_hdr(req, iomsg); | |
467 | #endif | |
468 | ||
469 | return __io_recvmsg_copy_hdr(req, iomsg); | |
470 | } | |
471 | ||
472 | int io_recvmsg_prep_async(struct io_kiocb *req) | |
473 | { | |
474 | int ret; | |
475 | ||
476 | ret = io_recvmsg_copy_hdr(req, req->async_data); | |
477 | if (!ret) | |
478 | req->flags |= REQ_F_NEED_CLEANUP; | |
479 | return ret; | |
480 | } | |
481 | ||
b3fdea6e DY |
482 | #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) |
483 | ||
f9ead18c JA |
484 | int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
485 | { | |
f2ccb5ae | 486 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
487 | |
488 | if (unlikely(sqe->file_index || sqe->addr2)) | |
489 | return -EINVAL; | |
490 | ||
491 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
492 | sr->len = READ_ONCE(sqe->len); | |
493 | sr->flags = READ_ONCE(sqe->ioprio); | |
b3fdea6e | 494 | if (sr->flags & ~(RECVMSG_FLAGS)) |
f9ead18c JA |
495 | return -EINVAL; |
496 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
497 | if (sr->msg_flags & MSG_DONTWAIT) | |
498 | req->flags |= REQ_F_NOWAIT; | |
499 | if (sr->msg_flags & MSG_ERRQUEUE) | |
500 | req->flags |= REQ_F_CLEAR_POLLIN; | |
b3fdea6e DY |
501 | if (sr->flags & IORING_RECV_MULTISHOT) { |
502 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
503 | return -EINVAL; | |
504 | if (sr->msg_flags & MSG_WAITALL) | |
505 | return -EINVAL; | |
506 | if (req->opcode == IORING_OP_RECV && sr->len) | |
507 | return -EINVAL; | |
508 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
509 | } | |
f9ead18c JA |
510 | |
511 | #ifdef CONFIG_COMPAT | |
512 | if (req->ctx->compat) | |
513 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
514 | #endif | |
515 | sr->done_io = 0; | |
516 | return 0; | |
517 | } | |
518 | ||
b3fdea6e DY |
519 | static inline void io_recv_prep_retry(struct io_kiocb *req) |
520 | { | |
f2ccb5ae | 521 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
b3fdea6e DY |
522 | |
523 | sr->done_io = 0; | |
524 | sr->len = 0; /* get from the provided buffer */ | |
525 | } | |
526 | ||
527 | /* | |
9bb66906 | 528 | * Finishes io_recv and io_recvmsg. |
b3fdea6e DY |
529 | * |
530 | * Returns true if it is actually finished, or false if it should run | |
531 | * again (for multishot). | |
532 | */ | |
9bb66906 DY |
533 | static inline bool io_recv_finish(struct io_kiocb *req, int *ret, |
534 | unsigned int cflags, bool mshot_finished) | |
b3fdea6e DY |
535 | { |
536 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
537 | io_req_set_res(req, *ret, cflags); | |
538 | *ret = IOU_OK; | |
539 | return true; | |
540 | } | |
541 | ||
9bb66906 | 542 | if (!mshot_finished) { |
b3fdea6e DY |
543 | if (io_post_aux_cqe(req->ctx, req->cqe.user_data, *ret, |
544 | cflags | IORING_CQE_F_MORE, false)) { | |
545 | io_recv_prep_retry(req); | |
546 | return false; | |
547 | } | |
548 | /* | |
549 | * Otherwise stop multishot but use the current result. | |
550 | * Probably will end up going into overflow, but this means | |
551 | * we cannot trust the ordering anymore | |
552 | */ | |
553 | } | |
554 | ||
555 | io_req_set_res(req, *ret, cflags); | |
556 | ||
557 | if (req->flags & REQ_F_POLLED) | |
558 | *ret = IOU_STOP_MULTISHOT; | |
e2df2ccb DY |
559 | else |
560 | *ret = IOU_OK; | |
b3fdea6e DY |
561 | return true; |
562 | } | |
563 | ||
9bb66906 DY |
564 | static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg, |
565 | struct io_sr_msg *sr, void __user **buf, | |
566 | size_t *len) | |
567 | { | |
568 | unsigned long ubuf = (unsigned long) *buf; | |
569 | unsigned long hdr; | |
570 | ||
571 | hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + | |
572 | kmsg->controllen; | |
573 | if (*len < hdr) | |
574 | return -EFAULT; | |
575 | ||
576 | if (kmsg->controllen) { | |
577 | unsigned long control = ubuf + hdr - kmsg->controllen; | |
578 | ||
d1f6222c | 579 | kmsg->msg.msg_control_user = (void __user *) control; |
9bb66906 DY |
580 | kmsg->msg.msg_controllen = kmsg->controllen; |
581 | } | |
582 | ||
583 | sr->buf = *buf; /* stash for later copy */ | |
d1f6222c | 584 | *buf = (void __user *) (ubuf + hdr); |
9bb66906 DY |
585 | kmsg->payloadlen = *len = *len - hdr; |
586 | return 0; | |
587 | } | |
588 | ||
589 | struct io_recvmsg_multishot_hdr { | |
590 | struct io_uring_recvmsg_out msg; | |
591 | struct sockaddr_storage addr; | |
592 | }; | |
593 | ||
594 | static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io, | |
595 | struct io_async_msghdr *kmsg, | |
596 | unsigned int flags, bool *finished) | |
597 | { | |
598 | int err; | |
599 | int copy_len; | |
600 | struct io_recvmsg_multishot_hdr hdr; | |
601 | ||
602 | if (kmsg->namelen) | |
603 | kmsg->msg.msg_name = &hdr.addr; | |
604 | kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
605 | kmsg->msg.msg_namelen = 0; | |
606 | ||
607 | if (sock->file->f_flags & O_NONBLOCK) | |
608 | flags |= MSG_DONTWAIT; | |
609 | ||
610 | err = sock_recvmsg(sock, &kmsg->msg, flags); | |
611 | *finished = err <= 0; | |
612 | if (err < 0) | |
613 | return err; | |
614 | ||
615 | hdr.msg = (struct io_uring_recvmsg_out) { | |
616 | .controllen = kmsg->controllen - kmsg->msg.msg_controllen, | |
617 | .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT | |
618 | }; | |
619 | ||
620 | hdr.msg.payloadlen = err; | |
621 | if (err > kmsg->payloadlen) | |
622 | err = kmsg->payloadlen; | |
623 | ||
624 | copy_len = sizeof(struct io_uring_recvmsg_out); | |
625 | if (kmsg->msg.msg_namelen > kmsg->namelen) | |
626 | copy_len += kmsg->namelen; | |
627 | else | |
628 | copy_len += kmsg->msg.msg_namelen; | |
629 | ||
630 | /* | |
631 | * "fromlen shall refer to the value before truncation.." | |
632 | * 1003.1g | |
633 | */ | |
634 | hdr.msg.namelen = kmsg->msg.msg_namelen; | |
635 | ||
636 | /* ensure that there is no gap between hdr and sockaddr_storage */ | |
637 | BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) != | |
638 | sizeof(struct io_uring_recvmsg_out)); | |
639 | if (copy_to_user(io->buf, &hdr, copy_len)) { | |
640 | *finished = true; | |
641 | return -EFAULT; | |
642 | } | |
643 | ||
644 | return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + | |
645 | kmsg->controllen + err; | |
646 | } | |
647 | ||
f9ead18c JA |
648 | int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
649 | { | |
f2ccb5ae | 650 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
651 | struct io_async_msghdr iomsg, *kmsg; |
652 | struct socket *sock; | |
653 | unsigned int cflags; | |
654 | unsigned flags; | |
655 | int ret, min_ret = 0; | |
656 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
9bb66906 | 657 | bool mshot_finished = true; |
f9ead18c JA |
658 | |
659 | sock = sock_from_file(req->file); | |
660 | if (unlikely(!sock)) | |
661 | return -ENOTSOCK; | |
662 | ||
663 | if (req_has_async_data(req)) { | |
664 | kmsg = req->async_data; | |
665 | } else { | |
666 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
667 | if (ret) | |
668 | return ret; | |
669 | kmsg = &iomsg; | |
670 | } | |
671 | ||
672 | if (!(req->flags & REQ_F_POLLED) && | |
673 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
43e0bbbd | 674 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 675 | |
9bb66906 | 676 | retry_multishot: |
f9ead18c JA |
677 | if (io_do_buffer_select(req)) { |
678 | void __user *buf; | |
9bb66906 | 679 | size_t len = sr->len; |
f9ead18c | 680 | |
9bb66906 | 681 | buf = io_buffer_select(req, &len, issue_flags); |
f9ead18c JA |
682 | if (!buf) |
683 | return -ENOBUFS; | |
9bb66906 DY |
684 | |
685 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
686 | ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); | |
687 | if (ret) { | |
688 | io_kbuf_recycle(req, issue_flags); | |
689 | return ret; | |
690 | } | |
691 | } | |
692 | ||
f9ead18c | 693 | kmsg->fast_iov[0].iov_base = buf; |
9bb66906 | 694 | kmsg->fast_iov[0].iov_len = len; |
f9ead18c | 695 | iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, 1, |
9bb66906 | 696 | len); |
f9ead18c JA |
697 | } |
698 | ||
699 | flags = sr->msg_flags; | |
700 | if (force_nonblock) | |
701 | flags |= MSG_DONTWAIT; | |
702 | if (flags & MSG_WAITALL) | |
703 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
704 | ||
705 | kmsg->msg.msg_get_inq = 1; | |
9bb66906 DY |
706 | if (req->flags & REQ_F_APOLL_MULTISHOT) |
707 | ret = io_recvmsg_multishot(sock, sr, kmsg, flags, | |
708 | &mshot_finished); | |
709 | else | |
710 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, | |
711 | kmsg->uaddr, flags); | |
712 | ||
f9ead18c | 713 | if (ret < min_ret) { |
9bb66906 DY |
714 | if (ret == -EAGAIN && force_nonblock) { |
715 | ret = io_setup_async_msg(req, kmsg, issue_flags); | |
716 | if (ret == -EAGAIN && (req->flags & IO_APOLL_MULTI_POLLED) == | |
717 | IO_APOLL_MULTI_POLLED) { | |
718 | io_kbuf_recycle(req, issue_flags); | |
719 | return IOU_ISSUE_SKIP_COMPLETE; | |
720 | } | |
721 | return ret; | |
722 | } | |
f9ead18c JA |
723 | if (ret == -ERESTARTSYS) |
724 | ret = -EINTR; | |
725 | if (ret > 0 && io_net_retry(sock, flags)) { | |
726 | sr->done_io += ret; | |
727 | req->flags |= REQ_F_PARTIAL_IO; | |
43e0bbbd | 728 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
729 | } |
730 | req_set_fail(req); | |
731 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
732 | req_set_fail(req); | |
733 | } | |
734 | ||
d4e097da | 735 | if (ret > 0) |
f9ead18c JA |
736 | ret += sr->done_io; |
737 | else if (sr->done_io) | |
738 | ret = sr->done_io; | |
d4e097da DY |
739 | else |
740 | io_kbuf_recycle(req, issue_flags); | |
741 | ||
f9ead18c JA |
742 | cflags = io_put_kbuf(req, issue_flags); |
743 | if (kmsg->msg.msg_inq) | |
744 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; | |
b3fdea6e | 745 | |
9bb66906 DY |
746 | if (!io_recv_finish(req, &ret, cflags, mshot_finished)) |
747 | goto retry_multishot; | |
748 | ||
749 | if (mshot_finished) { | |
750 | io_netmsg_recycle(req, issue_flags); | |
751 | /* fast path, check for non-NULL to avoid function call */ | |
752 | if (kmsg->free_iov) | |
753 | kfree(kmsg->free_iov); | |
754 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
755 | } | |
756 | ||
757 | return ret; | |
f9ead18c JA |
758 | } |
759 | ||
760 | int io_recv(struct io_kiocb *req, unsigned int issue_flags) | |
761 | { | |
f2ccb5ae | 762 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
763 | struct msghdr msg; |
764 | struct socket *sock; | |
765 | struct iovec iov; | |
766 | unsigned int cflags; | |
767 | unsigned flags; | |
768 | int ret, min_ret = 0; | |
769 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
b3fdea6e | 770 | size_t len = sr->len; |
f9ead18c JA |
771 | |
772 | if (!(req->flags & REQ_F_POLLED) && | |
773 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
774 | return -EAGAIN; | |
775 | ||
776 | sock = sock_from_file(req->file); | |
777 | if (unlikely(!sock)) | |
778 | return -ENOTSOCK; | |
779 | ||
b3fdea6e | 780 | retry_multishot: |
f9ead18c JA |
781 | if (io_do_buffer_select(req)) { |
782 | void __user *buf; | |
783 | ||
b3fdea6e | 784 | buf = io_buffer_select(req, &len, issue_flags); |
f9ead18c JA |
785 | if (!buf) |
786 | return -ENOBUFS; | |
787 | sr->buf = buf; | |
788 | } | |
789 | ||
b3fdea6e | 790 | ret = import_single_range(READ, sr->buf, len, &iov, &msg.msg_iter); |
f9ead18c JA |
791 | if (unlikely(ret)) |
792 | goto out_free; | |
793 | ||
794 | msg.msg_name = NULL; | |
795 | msg.msg_namelen = 0; | |
796 | msg.msg_control = NULL; | |
797 | msg.msg_get_inq = 1; | |
798 | msg.msg_flags = 0; | |
799 | msg.msg_controllen = 0; | |
800 | msg.msg_iocb = NULL; | |
e02b6651 | 801 | msg.msg_ubuf = NULL; |
f9ead18c JA |
802 | |
803 | flags = sr->msg_flags; | |
804 | if (force_nonblock) | |
805 | flags |= MSG_DONTWAIT; | |
806 | if (flags & MSG_WAITALL) | |
807 | min_ret = iov_iter_count(&msg.msg_iter); | |
808 | ||
809 | ret = sock_recvmsg(sock, &msg, flags); | |
810 | if (ret < min_ret) { | |
b3fdea6e DY |
811 | if (ret == -EAGAIN && force_nonblock) { |
812 | if ((req->flags & IO_APOLL_MULTI_POLLED) == IO_APOLL_MULTI_POLLED) { | |
813 | io_kbuf_recycle(req, issue_flags); | |
814 | return IOU_ISSUE_SKIP_COMPLETE; | |
815 | } | |
816 | ||
f9ead18c | 817 | return -EAGAIN; |
b3fdea6e | 818 | } |
f9ead18c JA |
819 | if (ret == -ERESTARTSYS) |
820 | ret = -EINTR; | |
821 | if (ret > 0 && io_net_retry(sock, flags)) { | |
822 | sr->len -= ret; | |
823 | sr->buf += ret; | |
824 | sr->done_io += ret; | |
825 | req->flags |= REQ_F_PARTIAL_IO; | |
826 | return -EAGAIN; | |
827 | } | |
828 | req_set_fail(req); | |
829 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
830 | out_free: | |
831 | req_set_fail(req); | |
832 | } | |
833 | ||
d4e097da | 834 | if (ret > 0) |
f9ead18c JA |
835 | ret += sr->done_io; |
836 | else if (sr->done_io) | |
837 | ret = sr->done_io; | |
d4e097da DY |
838 | else |
839 | io_kbuf_recycle(req, issue_flags); | |
840 | ||
f9ead18c JA |
841 | cflags = io_put_kbuf(req, issue_flags); |
842 | if (msg.msg_inq) | |
843 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; | |
b3fdea6e | 844 | |
9bb66906 | 845 | if (!io_recv_finish(req, &ret, cflags, ret <= 0)) |
b3fdea6e DY |
846 | goto retry_multishot; |
847 | ||
848 | return ret; | |
f9ead18c JA |
849 | } |
850 | ||
06a5464b PB |
851 | int io_sendzc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
852 | { | |
f2ccb5ae | 853 | struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc); |
10c7d33e | 854 | struct io_ring_ctx *ctx = req->ctx; |
06a5464b | 855 | |
092aeedb | 856 | if (READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)) |
06a5464b PB |
857 | return -EINVAL; |
858 | ||
859 | zc->flags = READ_ONCE(sqe->ioprio); | |
63809137 PB |
860 | if (zc->flags & ~(IORING_RECVSEND_POLL_FIRST | |
861 | IORING_RECVSEND_FIXED_BUF | IORING_RECVSEND_NOTIF_FLUSH)) | |
06a5464b | 862 | return -EINVAL; |
10c7d33e PB |
863 | if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
864 | unsigned idx = READ_ONCE(sqe->buf_index); | |
865 | ||
866 | if (unlikely(idx >= ctx->nr_user_bufs)) | |
867 | return -EFAULT; | |
868 | idx = array_index_nospec(idx, ctx->nr_user_bufs); | |
869 | req->imu = READ_ONCE(ctx->user_bufs[idx]); | |
870 | io_req_set_rsrc_node(req, ctx, 0); | |
871 | } | |
06a5464b PB |
872 | |
873 | zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
874 | zc->len = READ_ONCE(sqe->len); | |
875 | zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
876 | zc->slot_idx = READ_ONCE(sqe->notification_idx); | |
877 | if (zc->msg_flags & MSG_DONTWAIT) | |
878 | req->flags |= REQ_F_NOWAIT; | |
092aeedb PB |
879 | |
880 | zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
881 | zc->addr_len = READ_ONCE(sqe->addr_len); | |
4a933e62 | 882 | zc->done_io = 0; |
092aeedb | 883 | |
06a5464b PB |
884 | #ifdef CONFIG_COMPAT |
885 | if (req->ctx->compat) | |
886 | zc->msg_flags |= MSG_CMSG_COMPAT; | |
887 | #endif | |
888 | return 0; | |
889 | } | |
890 | ||
3ff1a0d3 PB |
891 | static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, |
892 | struct iov_iter *from, size_t length) | |
893 | { | |
894 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
895 | int frag = shinfo->nr_frags; | |
896 | int ret = 0; | |
897 | struct bvec_iter bi; | |
898 | ssize_t copied = 0; | |
899 | unsigned long truesize = 0; | |
900 | ||
901 | if (!shinfo->nr_frags) | |
902 | shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; | |
903 | ||
904 | if (!skb_zcopy_managed(skb) || !iov_iter_is_bvec(from)) { | |
905 | skb_zcopy_downgrade_managed(skb); | |
906 | return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); | |
907 | } | |
908 | ||
909 | bi.bi_size = min(from->count, length); | |
910 | bi.bi_bvec_done = from->iov_offset; | |
911 | bi.bi_idx = 0; | |
912 | ||
913 | while (bi.bi_size && frag < MAX_SKB_FRAGS) { | |
914 | struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); | |
915 | ||
916 | copied += v.bv_len; | |
917 | truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); | |
918 | __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, | |
919 | v.bv_offset, v.bv_len); | |
920 | bvec_iter_advance_single(from->bvec, &bi, v.bv_len); | |
921 | } | |
922 | if (bi.bi_size) | |
923 | ret = -EMSGSIZE; | |
924 | ||
925 | shinfo->nr_frags = frag; | |
926 | from->bvec += bi.bi_idx; | |
927 | from->nr_segs -= bi.bi_idx; | |
928 | from->count = bi.bi_size; | |
929 | from->iov_offset = bi.bi_bvec_done; | |
930 | ||
931 | skb->data_len += copied; | |
932 | skb->len += copied; | |
933 | skb->truesize += truesize; | |
934 | ||
935 | if (sk && sk->sk_type == SOCK_STREAM) { | |
936 | sk_wmem_queued_add(sk, truesize); | |
937 | if (!skb_zcopy_pure(skb)) | |
938 | sk_mem_charge(sk, truesize); | |
939 | } else { | |
940 | refcount_add(truesize, &skb->sk->sk_wmem_alloc); | |
941 | } | |
942 | return ret; | |
943 | } | |
944 | ||
06a5464b PB |
945 | int io_sendzc(struct io_kiocb *req, unsigned int issue_flags) |
946 | { | |
092aeedb | 947 | struct sockaddr_storage address; |
06a5464b | 948 | struct io_ring_ctx *ctx = req->ctx; |
f2ccb5ae | 949 | struct io_sendzc *zc = io_kiocb_to_cmd(req, struct io_sendzc); |
06a5464b | 950 | struct io_notif_slot *notif_slot; |
14b146b6 | 951 | struct io_kiocb *notif; |
06a5464b PB |
952 | struct msghdr msg; |
953 | struct iovec iov; | |
954 | struct socket *sock; | |
955 | unsigned msg_flags; | |
956 | int ret, min_ret = 0; | |
957 | ||
958 | if (!(req->flags & REQ_F_POLLED) && | |
959 | (zc->flags & IORING_RECVSEND_POLL_FIRST)) | |
960 | return -EAGAIN; | |
961 | ||
962 | if (issue_flags & IO_URING_F_UNLOCKED) | |
963 | return -EAGAIN; | |
964 | sock = sock_from_file(req->file); | |
965 | if (unlikely(!sock)) | |
966 | return -ENOTSOCK; | |
967 | ||
968 | notif_slot = io_get_notif_slot(ctx, zc->slot_idx); | |
969 | if (!notif_slot) | |
970 | return -EINVAL; | |
971 | notif = io_get_notif(ctx, notif_slot); | |
972 | if (!notif) | |
973 | return -ENOMEM; | |
974 | ||
975 | msg.msg_name = NULL; | |
976 | msg.msg_control = NULL; | |
977 | msg.msg_controllen = 0; | |
978 | msg.msg_namelen = 0; | |
979 | ||
10c7d33e PB |
980 | if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
981 | ret = io_import_fixed(WRITE, &msg.msg_iter, req->imu, | |
982 | (u64)(uintptr_t)zc->buf, zc->len); | |
983 | if (unlikely(ret)) | |
984 | return ret; | |
985 | } else { | |
986 | ret = import_single_range(WRITE, zc->buf, zc->len, &iov, | |
987 | &msg.msg_iter); | |
988 | if (unlikely(ret)) | |
989 | return ret; | |
6a9ce66f | 990 | ret = io_notif_account_mem(notif, zc->len); |
2e32ba56 PB |
991 | if (unlikely(ret)) |
992 | return ret; | |
10c7d33e | 993 | } |
06a5464b | 994 | |
092aeedb PB |
995 | if (zc->addr) { |
996 | ret = move_addr_to_kernel(zc->addr, zc->addr_len, &address); | |
997 | if (unlikely(ret < 0)) | |
998 | return ret; | |
999 | msg.msg_name = (struct sockaddr *)&address; | |
1000 | msg.msg_namelen = zc->addr_len; | |
1001 | } | |
1002 | ||
06a5464b PB |
1003 | msg_flags = zc->msg_flags | MSG_ZEROCOPY; |
1004 | if (issue_flags & IO_URING_F_NONBLOCK) | |
1005 | msg_flags |= MSG_DONTWAIT; | |
1006 | if (msg_flags & MSG_WAITALL) | |
1007 | min_ret = iov_iter_count(&msg.msg_iter); | |
1008 | ||
1009 | msg.msg_flags = msg_flags; | |
14b146b6 | 1010 | msg.msg_ubuf = &io_notif_to_data(notif)->uarg; |
3ff1a0d3 | 1011 | msg.sg_from_iter = io_sg_from_iter; |
06a5464b PB |
1012 | ret = sock_sendmsg(sock, &msg); |
1013 | ||
1014 | if (unlikely(ret < min_ret)) { | |
1015 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
1016 | return -EAGAIN; | |
4a933e62 PB |
1017 | if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { |
1018 | zc->len -= ret; | |
1019 | zc->buf += ret; | |
1020 | zc->done_io += ret; | |
1021 | req->flags |= REQ_F_PARTIAL_IO; | |
1022 | return -EAGAIN; | |
1023 | } | |
1024 | if (ret == -ERESTARTSYS) | |
1025 | ret = -EINTR; | |
1026 | } else if (zc->flags & IORING_RECVSEND_NOTIF_FLUSH) { | |
1027 | io_notif_slot_flush_submit(notif_slot, 0); | |
06a5464b PB |
1028 | } |
1029 | ||
4a933e62 PB |
1030 | if (ret >= 0) |
1031 | ret += zc->done_io; | |
1032 | else if (zc->done_io) | |
1033 | ret = zc->done_io; | |
06a5464b PB |
1034 | io_req_set_res(req, ret, 0); |
1035 | return IOU_OK; | |
1036 | } | |
1037 | ||
f9ead18c JA |
1038 | int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
1039 | { | |
f2ccb5ae | 1040 | struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
f9ead18c JA |
1041 | unsigned flags; |
1042 | ||
1043 | if (sqe->len || sqe->buf_index) | |
1044 | return -EINVAL; | |
1045 | ||
1046 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
1047 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
1048 | accept->flags = READ_ONCE(sqe->accept_flags); | |
1049 | accept->nofile = rlimit(RLIMIT_NOFILE); | |
1050 | flags = READ_ONCE(sqe->ioprio); | |
1051 | if (flags & ~IORING_ACCEPT_MULTISHOT) | |
1052 | return -EINVAL; | |
1053 | ||
1054 | accept->file_slot = READ_ONCE(sqe->file_index); | |
1055 | if (accept->file_slot) { | |
1056 | if (accept->flags & SOCK_CLOEXEC) | |
1057 | return -EINVAL; | |
1058 | if (flags & IORING_ACCEPT_MULTISHOT && | |
1059 | accept->file_slot != IORING_FILE_INDEX_ALLOC) | |
1060 | return -EINVAL; | |
1061 | } | |
1062 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1063 | return -EINVAL; | |
1064 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
1065 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1066 | if (flags & IORING_ACCEPT_MULTISHOT) | |
1067 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | int io_accept(struct io_kiocb *req, unsigned int issue_flags) | |
1072 | { | |
1073 | struct io_ring_ctx *ctx = req->ctx; | |
f2ccb5ae | 1074 | struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
f9ead18c JA |
1075 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
1076 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; | |
1077 | bool fixed = !!accept->file_slot; | |
1078 | struct file *file; | |
1079 | int ret, fd; | |
1080 | ||
1081 | retry: | |
1082 | if (!fixed) { | |
1083 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
1084 | if (unlikely(fd < 0)) | |
1085 | return fd; | |
1086 | } | |
1087 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, | |
1088 | accept->flags); | |
1089 | if (IS_ERR(file)) { | |
1090 | if (!fixed) | |
1091 | put_unused_fd(fd); | |
1092 | ret = PTR_ERR(file); | |
1093 | if (ret == -EAGAIN && force_nonblock) { | |
1094 | /* | |
1095 | * if it's multishot and polled, we don't need to | |
1096 | * return EAGAIN to arm the poll infra since it | |
1097 | * has already been done | |
1098 | */ | |
1099 | if ((req->flags & IO_APOLL_MULTI_POLLED) == | |
1100 | IO_APOLL_MULTI_POLLED) | |
1101 | ret = IOU_ISSUE_SKIP_COMPLETE; | |
1102 | return ret; | |
1103 | } | |
1104 | if (ret == -ERESTARTSYS) | |
1105 | ret = -EINTR; | |
1106 | req_set_fail(req); | |
1107 | } else if (!fixed) { | |
1108 | fd_install(fd, file); | |
1109 | ret = fd; | |
1110 | } else { | |
1111 | ret = io_fixed_fd_install(req, issue_flags, file, | |
1112 | accept->file_slot); | |
1113 | } | |
1114 | ||
1115 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
1116 | io_req_set_res(req, ret, 0); | |
1117 | return IOU_OK; | |
1118 | } | |
f9ead18c | 1119 | |
cbd25748 DY |
1120 | if (ret >= 0 && |
1121 | io_post_aux_cqe(ctx, req->cqe.user_data, ret, IORING_CQE_F_MORE, false)) | |
d245bca6 | 1122 | goto retry; |
cbd25748 DY |
1123 | |
1124 | io_req_set_res(req, ret, 0); | |
1125 | if (req->flags & REQ_F_POLLED) | |
1126 | return IOU_STOP_MULTISHOT; | |
1127 | return IOU_OK; | |
f9ead18c JA |
1128 | } |
1129 | ||
1130 | int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
1131 | { | |
f2ccb5ae | 1132 | struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
f9ead18c JA |
1133 | |
1134 | if (sqe->addr || sqe->rw_flags || sqe->buf_index) | |
1135 | return -EINVAL; | |
1136 | ||
1137 | sock->domain = READ_ONCE(sqe->fd); | |
1138 | sock->type = READ_ONCE(sqe->off); | |
1139 | sock->protocol = READ_ONCE(sqe->len); | |
1140 | sock->file_slot = READ_ONCE(sqe->file_index); | |
1141 | sock->nofile = rlimit(RLIMIT_NOFILE); | |
1142 | ||
1143 | sock->flags = sock->type & ~SOCK_TYPE_MASK; | |
1144 | if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) | |
1145 | return -EINVAL; | |
1146 | if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1147 | return -EINVAL; | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | int io_socket(struct io_kiocb *req, unsigned int issue_flags) | |
1152 | { | |
f2ccb5ae | 1153 | struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
f9ead18c JA |
1154 | bool fixed = !!sock->file_slot; |
1155 | struct file *file; | |
1156 | int ret, fd; | |
1157 | ||
1158 | if (!fixed) { | |
1159 | fd = __get_unused_fd_flags(sock->flags, sock->nofile); | |
1160 | if (unlikely(fd < 0)) | |
1161 | return fd; | |
1162 | } | |
1163 | file = __sys_socket_file(sock->domain, sock->type, sock->protocol); | |
1164 | if (IS_ERR(file)) { | |
1165 | if (!fixed) | |
1166 | put_unused_fd(fd); | |
1167 | ret = PTR_ERR(file); | |
1168 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
1169 | return -EAGAIN; | |
1170 | if (ret == -ERESTARTSYS) | |
1171 | ret = -EINTR; | |
1172 | req_set_fail(req); | |
1173 | } else if (!fixed) { | |
1174 | fd_install(fd, file); | |
1175 | ret = fd; | |
1176 | } else { | |
1177 | ret = io_fixed_fd_install(req, issue_flags, file, | |
1178 | sock->file_slot); | |
1179 | } | |
1180 | io_req_set_res(req, ret, 0); | |
1181 | return IOU_OK; | |
1182 | } | |
1183 | ||
1184 | int io_connect_prep_async(struct io_kiocb *req) | |
1185 | { | |
1186 | struct io_async_connect *io = req->async_data; | |
f2ccb5ae | 1187 | struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1188 | |
1189 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
1190 | } | |
1191 | ||
1192 | int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
1193 | { | |
f2ccb5ae | 1194 | struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1195 | |
1196 | if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) | |
1197 | return -EINVAL; | |
1198 | ||
1199 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
1200 | conn->addr_len = READ_ONCE(sqe->addr2); | |
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | int io_connect(struct io_kiocb *req, unsigned int issue_flags) | |
1205 | { | |
f2ccb5ae | 1206 | struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1207 | struct io_async_connect __io, *io; |
1208 | unsigned file_flags; | |
1209 | int ret; | |
1210 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
1211 | ||
1212 | if (req_has_async_data(req)) { | |
1213 | io = req->async_data; | |
1214 | } else { | |
1215 | ret = move_addr_to_kernel(connect->addr, | |
1216 | connect->addr_len, | |
1217 | &__io.address); | |
1218 | if (ret) | |
1219 | goto out; | |
1220 | io = &__io; | |
1221 | } | |
1222 | ||
1223 | file_flags = force_nonblock ? O_NONBLOCK : 0; | |
1224 | ||
1225 | ret = __sys_connect_file(req->file, &io->address, | |
1226 | connect->addr_len, file_flags); | |
1227 | if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { | |
1228 | if (req_has_async_data(req)) | |
1229 | return -EAGAIN; | |
1230 | if (io_alloc_async_data(req)) { | |
1231 | ret = -ENOMEM; | |
1232 | goto out; | |
1233 | } | |
1234 | memcpy(req->async_data, &__io, sizeof(__io)); | |
1235 | return -EAGAIN; | |
1236 | } | |
1237 | if (ret == -ERESTARTSYS) | |
1238 | ret = -EINTR; | |
1239 | out: | |
1240 | if (ret < 0) | |
1241 | req_set_fail(req); | |
1242 | io_req_set_res(req, ret, 0); | |
1243 | return IOU_OK; | |
1244 | } | |
43e0bbbd JA |
1245 | |
1246 | void io_netmsg_cache_free(struct io_cache_entry *entry) | |
1247 | { | |
1248 | kfree(container_of(entry, struct io_async_msghdr, cache)); | |
1249 | } | |
f9ead18c | 1250 | #endif |