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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; | |
3fb1bd68 | 49 | bool in_progress; |
74e2e17e | 50 | bool seen_econnaborted; |
f9ead18c JA |
51 | }; |
52 | ||
53 | struct io_sr_msg { | |
54 | struct file *file; | |
55 | union { | |
56 | struct compat_msghdr __user *umsg_compat; | |
57 | struct user_msghdr __user *umsg; | |
58 | void __user *buf; | |
59 | }; | |
0b048557 PB |
60 | unsigned len; |
61 | unsigned done_io; | |
293402e5 | 62 | unsigned msg_flags; |
0b048557 | 63 | u16 flags; |
516e82f0 | 64 | /* initialised and used only by !msg send variants */ |
0b048557 | 65 | u16 addr_len; |
b00c51ef | 66 | u16 buf_group; |
092aeedb | 67 | void __user *addr; |
cac9e441 | 68 | void __user *msg_control; |
516e82f0 | 69 | /* used only for send zerocopy */ |
b48c312b | 70 | struct io_kiocb *notif; |
06a5464b PB |
71 | }; |
72 | ||
17add5ce PB |
73 | static inline bool io_check_multishot(struct io_kiocb *req, |
74 | unsigned int issue_flags) | |
75 | { | |
76 | /* | |
77 | * When ->locked_cq is set we only allow to post CQEs from the original | |
78 | * task context. Usual request completions will be handled in other | |
79 | * generic paths but multipoll may decide to post extra cqes. | |
80 | */ | |
81 | return !(issue_flags & IO_URING_F_IOWQ) || | |
82 | !(issue_flags & IO_URING_F_MULTISHOT) || | |
83 | !req->ctx->task_complete; | |
84 | } | |
85 | ||
f9ead18c JA |
86 | int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
87 | { | |
f2ccb5ae | 88 | struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); |
f9ead18c JA |
89 | |
90 | if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || | |
91 | sqe->buf_index || sqe->splice_fd_in)) | |
92 | return -EINVAL; | |
93 | ||
94 | shutdown->how = READ_ONCE(sqe->len); | |
aebb224f | 95 | req->flags |= REQ_F_FORCE_ASYNC; |
f9ead18c JA |
96 | return 0; |
97 | } | |
98 | ||
99 | int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) | |
100 | { | |
f2ccb5ae | 101 | struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); |
f9ead18c JA |
102 | struct socket *sock; |
103 | int ret; | |
104 | ||
aebb224f | 105 | WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); |
f9ead18c JA |
106 | |
107 | sock = sock_from_file(req->file); | |
108 | if (unlikely(!sock)) | |
109 | return -ENOTSOCK; | |
110 | ||
111 | ret = __sys_shutdown_sock(sock, shutdown->how); | |
112 | io_req_set_res(req, ret, 0); | |
113 | return IOU_OK; | |
114 | } | |
115 | ||
116 | static bool io_net_retry(struct socket *sock, int flags) | |
117 | { | |
118 | if (!(flags & MSG_WAITALL)) | |
119 | return false; | |
120 | return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; | |
121 | } | |
122 | ||
43e0bbbd JA |
123 | static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) |
124 | { | |
125 | struct io_async_msghdr *hdr = req->async_data; | |
126 | ||
06360426 | 127 | if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) |
43e0bbbd JA |
128 | return; |
129 | ||
130 | /* Let normal cleanup path reap it if we fail adding to the cache */ | |
131 | if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { | |
132 | req->async_data = NULL; | |
133 | req->flags &= ~REQ_F_ASYNC_DATA; | |
134 | } | |
135 | } | |
136 | ||
858c293e PB |
137 | static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req, |
138 | unsigned int issue_flags) | |
43e0bbbd JA |
139 | { |
140 | struct io_ring_ctx *ctx = req->ctx; | |
141 | struct io_cache_entry *entry; | |
4c17a496 | 142 | struct io_async_msghdr *hdr; |
43e0bbbd | 143 | |
df730ec2 XL |
144 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { |
145 | entry = io_alloc_cache_get(&ctx->netmsg_cache); | |
146 | if (entry) { | |
147 | hdr = container_of(entry, struct io_async_msghdr, cache); | |
148 | hdr->free_iov = NULL; | |
149 | req->flags |= REQ_F_ASYNC_DATA; | |
150 | req->async_data = hdr; | |
151 | return hdr; | |
152 | } | |
43e0bbbd JA |
153 | } |
154 | ||
4c17a496 PB |
155 | if (!io_alloc_async_data(req)) { |
156 | hdr = req->async_data; | |
157 | hdr->free_iov = NULL; | |
158 | return hdr; | |
159 | } | |
43e0bbbd JA |
160 | return NULL; |
161 | } | |
162 | ||
858c293e PB |
163 | static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req) |
164 | { | |
165 | /* ->prep_async is always called from the submission context */ | |
166 | return io_msg_alloc_async(req, 0); | |
167 | } | |
168 | ||
f9ead18c | 169 | static int io_setup_async_msg(struct io_kiocb *req, |
43e0bbbd JA |
170 | struct io_async_msghdr *kmsg, |
171 | unsigned int issue_flags) | |
f9ead18c | 172 | { |
3f743e9b | 173 | struct io_async_msghdr *async_msg; |
f9ead18c | 174 | |
3f743e9b | 175 | if (req_has_async_data(req)) |
f9ead18c | 176 | return -EAGAIN; |
858c293e | 177 | async_msg = io_msg_alloc_async(req, issue_flags); |
43e0bbbd | 178 | if (!async_msg) { |
f9ead18c JA |
179 | kfree(kmsg->free_iov); |
180 | return -ENOMEM; | |
181 | } | |
f9ead18c JA |
182 | req->flags |= REQ_F_NEED_CLEANUP; |
183 | memcpy(async_msg, kmsg, sizeof(*kmsg)); | |
6f10ae8a PB |
184 | if (async_msg->msg.msg_name) |
185 | async_msg->msg.msg_name = &async_msg->addr; | |
c21a8027 PB |
186 | |
187 | if ((req->flags & REQ_F_BUFFER_SELECT) && !async_msg->msg.msg_iter.nr_segs) | |
188 | return -EAGAIN; | |
189 | ||
f9ead18c | 190 | /* if were using fast_iov, set it to the new one */ |
4b61152e | 191 | if (iter_is_iovec(&kmsg->msg.msg_iter) && !kmsg->free_iov) { |
de4f5fed JA |
192 | size_t fast_idx = iter_iov(&kmsg->msg.msg_iter) - kmsg->fast_iov; |
193 | async_msg->msg.msg_iter.__iov = &async_msg->fast_iov[fast_idx]; | |
3e4cb6eb | 194 | } |
f9ead18c JA |
195 | |
196 | return -EAGAIN; | |
197 | } | |
198 | ||
199 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, | |
200 | struct io_async_msghdr *iomsg) | |
201 | { | |
f2ccb5ae | 202 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
cac9e441 | 203 | int ret; |
f9ead18c JA |
204 | |
205 | iomsg->msg.msg_name = &iomsg->addr; | |
206 | iomsg->free_iov = iomsg->fast_iov; | |
cac9e441 | 207 | ret = sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, |
f9ead18c | 208 | &iomsg->free_iov); |
cac9e441 | 209 | /* save msg_control as sys_sendmsg() overwrites it */ |
26fed836 | 210 | sr->msg_control = iomsg->msg.msg_control_user; |
cac9e441 | 211 | return ret; |
f9ead18c JA |
212 | } |
213 | ||
516e82f0 | 214 | int io_send_prep_async(struct io_kiocb *req) |
581711c4 | 215 | { |
ac9e5784 | 216 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
581711c4 PB |
217 | struct io_async_msghdr *io; |
218 | int ret; | |
219 | ||
220 | if (!zc->addr || req_has_async_data(req)) | |
221 | return 0; | |
6bf8ad25 PB |
222 | io = io_msg_alloc_async_prep(req); |
223 | if (!io) | |
581711c4 | 224 | return -ENOMEM; |
581711c4 PB |
225 | ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); |
226 | return ret; | |
227 | } | |
228 | ||
229 | static int io_setup_async_addr(struct io_kiocb *req, | |
6ae61b7a | 230 | struct sockaddr_storage *addr_storage, |
581711c4 PB |
231 | unsigned int issue_flags) |
232 | { | |
6ae61b7a | 233 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
581711c4 PB |
234 | struct io_async_msghdr *io; |
235 | ||
6ae61b7a | 236 | if (!sr->addr || req_has_async_data(req)) |
581711c4 | 237 | return -EAGAIN; |
6bf8ad25 PB |
238 | io = io_msg_alloc_async(req, issue_flags); |
239 | if (!io) | |
581711c4 | 240 | return -ENOMEM; |
6ae61b7a | 241 | memcpy(&io->addr, addr_storage, sizeof(io->addr)); |
581711c4 PB |
242 | return -EAGAIN; |
243 | } | |
244 | ||
f9ead18c JA |
245 | int io_sendmsg_prep_async(struct io_kiocb *req) |
246 | { | |
247 | int ret; | |
248 | ||
858c293e PB |
249 | if (!io_msg_alloc_async_prep(req)) |
250 | return -ENOMEM; | |
f9ead18c JA |
251 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
252 | if (!ret) | |
253 | req->flags |= REQ_F_NEED_CLEANUP; | |
254 | return ret; | |
255 | } | |
256 | ||
257 | void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) | |
258 | { | |
259 | struct io_async_msghdr *io = req->async_data; | |
260 | ||
261 | kfree(io->free_iov); | |
262 | } | |
263 | ||
264 | int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
265 | { | |
f2ccb5ae | 266 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c | 267 | |
516e82f0 PB |
268 | if (req->opcode == IORING_OP_SEND) { |
269 | if (READ_ONCE(sqe->__pad3[0])) | |
270 | return -EINVAL; | |
271 | sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
272 | sr->addr_len = READ_ONCE(sqe->addr_len); | |
273 | } else if (sqe->addr2 || sqe->file_index) { | |
f9ead18c | 274 | return -EINVAL; |
516e82f0 | 275 | } |
f9ead18c JA |
276 | |
277 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
278 | sr->len = READ_ONCE(sqe->len); | |
279 | sr->flags = READ_ONCE(sqe->ioprio); | |
280 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) | |
281 | return -EINVAL; | |
282 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
283 | if (sr->msg_flags & MSG_DONTWAIT) | |
284 | req->flags |= REQ_F_NOWAIT; | |
285 | ||
286 | #ifdef CONFIG_COMPAT | |
287 | if (req->ctx->compat) | |
288 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
289 | #endif | |
290 | sr->done_io = 0; | |
291 | return 0; | |
292 | } | |
293 | ||
294 | int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) | |
295 | { | |
f2ccb5ae | 296 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
297 | struct io_async_msghdr iomsg, *kmsg; |
298 | struct socket *sock; | |
299 | unsigned flags; | |
300 | int min_ret = 0; | |
301 | int ret; | |
302 | ||
303 | sock = sock_from_file(req->file); | |
304 | if (unlikely(!sock)) | |
305 | return -ENOTSOCK; | |
306 | ||
307 | if (req_has_async_data(req)) { | |
308 | kmsg = req->async_data; | |
26fed836 | 309 | kmsg->msg.msg_control_user = sr->msg_control; |
f9ead18c JA |
310 | } else { |
311 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
312 | if (ret) | |
313 | return ret; | |
314 | kmsg = &iomsg; | |
315 | } | |
316 | ||
317 | if (!(req->flags & REQ_F_POLLED) && | |
318 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
43e0bbbd | 319 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
320 | |
321 | flags = sr->msg_flags; | |
322 | if (issue_flags & IO_URING_F_NONBLOCK) | |
323 | flags |= MSG_DONTWAIT; | |
324 | if (flags & MSG_WAITALL) | |
325 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
326 | ||
327 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); | |
328 | ||
329 | if (ret < min_ret) { | |
330 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
43e0bbbd | 331 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 332 | if (ret > 0 && io_net_retry(sock, flags)) { |
b1dc4920 JA |
333 | kmsg->msg.msg_controllen = 0; |
334 | kmsg->msg.msg_control = NULL; | |
f9ead18c JA |
335 | sr->done_io += ret; |
336 | req->flags |= REQ_F_PARTIAL_IO; | |
43e0bbbd | 337 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 338 | } |
95eafc74 PB |
339 | if (ret == -ERESTARTSYS) |
340 | ret = -EINTR; | |
f9ead18c JA |
341 | req_set_fail(req); |
342 | } | |
343 | /* fast path, check for non-NULL to avoid function call */ | |
344 | if (kmsg->free_iov) | |
345 | kfree(kmsg->free_iov); | |
346 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
43e0bbbd | 347 | io_netmsg_recycle(req, issue_flags); |
f9ead18c JA |
348 | if (ret >= 0) |
349 | ret += sr->done_io; | |
350 | else if (sr->done_io) | |
351 | ret = sr->done_io; | |
352 | io_req_set_res(req, ret, 0); | |
353 | return IOU_OK; | |
354 | } | |
355 | ||
356 | int io_send(struct io_kiocb *req, unsigned int issue_flags) | |
357 | { | |
516e82f0 | 358 | struct sockaddr_storage __address; |
f2ccb5ae | 359 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c | 360 | struct msghdr msg; |
f9ead18c JA |
361 | struct socket *sock; |
362 | unsigned flags; | |
363 | int min_ret = 0; | |
364 | int ret; | |
365 | ||
04360d3e PB |
366 | msg.msg_name = NULL; |
367 | msg.msg_control = NULL; | |
368 | msg.msg_controllen = 0; | |
369 | msg.msg_namelen = 0; | |
370 | msg.msg_ubuf = NULL; | |
371 | ||
516e82f0 PB |
372 | if (sr->addr) { |
373 | if (req_has_async_data(req)) { | |
374 | struct io_async_msghdr *io = req->async_data; | |
375 | ||
376 | msg.msg_name = &io->addr; | |
377 | } else { | |
378 | ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address); | |
379 | if (unlikely(ret < 0)) | |
380 | return ret; | |
381 | msg.msg_name = (struct sockaddr *)&__address; | |
382 | } | |
383 | msg.msg_namelen = sr->addr_len; | |
384 | } | |
385 | ||
f9ead18c JA |
386 | if (!(req->flags & REQ_F_POLLED) && |
387 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
516e82f0 | 388 | return io_setup_async_addr(req, &__address, issue_flags); |
f9ead18c JA |
389 | |
390 | sock = sock_from_file(req->file); | |
391 | if (unlikely(!sock)) | |
392 | return -ENOTSOCK; | |
393 | ||
4b61152e | 394 | ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter); |
f9ead18c JA |
395 | if (unlikely(ret)) |
396 | return ret; | |
397 | ||
f9ead18c JA |
398 | flags = sr->msg_flags; |
399 | if (issue_flags & IO_URING_F_NONBLOCK) | |
400 | flags |= MSG_DONTWAIT; | |
401 | if (flags & MSG_WAITALL) | |
402 | min_ret = iov_iter_count(&msg.msg_iter); | |
403 | ||
b841b901 | 404 | flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; |
f9ead18c JA |
405 | msg.msg_flags = flags; |
406 | ret = sock_sendmsg(sock, &msg); | |
407 | if (ret < min_ret) { | |
408 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
516e82f0 PB |
409 | return io_setup_async_addr(req, &__address, issue_flags); |
410 | ||
f9ead18c JA |
411 | if (ret > 0 && io_net_retry(sock, flags)) { |
412 | sr->len -= ret; | |
413 | sr->buf += ret; | |
414 | sr->done_io += ret; | |
415 | req->flags |= REQ_F_PARTIAL_IO; | |
516e82f0 | 416 | return io_setup_async_addr(req, &__address, issue_flags); |
f9ead18c | 417 | } |
95eafc74 PB |
418 | if (ret == -ERESTARTSYS) |
419 | ret = -EINTR; | |
f9ead18c JA |
420 | req_set_fail(req); |
421 | } | |
422 | if (ret >= 0) | |
423 | ret += sr->done_io; | |
424 | else if (sr->done_io) | |
425 | ret = sr->done_io; | |
426 | io_req_set_res(req, ret, 0); | |
427 | return IOU_OK; | |
428 | } | |
429 | ||
9bb66906 DY |
430 | static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) |
431 | { | |
9b0fc3c0 | 432 | int hdr; |
9bb66906 | 433 | |
9b0fc3c0 | 434 | if (iomsg->namelen < 0) |
9bb66906 | 435 | return true; |
9b0fc3c0 DY |
436 | if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), |
437 | iomsg->namelen, &hdr)) | |
9bb66906 | 438 | return true; |
9b0fc3c0 | 439 | if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) |
9bb66906 DY |
440 | return true; |
441 | ||
442 | return false; | |
443 | } | |
444 | ||
f9ead18c JA |
445 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
446 | struct io_async_msghdr *iomsg) | |
447 | { | |
f2ccb5ae | 448 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
7fa875b8 | 449 | struct user_msghdr msg; |
f9ead18c JA |
450 | int ret; |
451 | ||
7fa875b8 DY |
452 | if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) |
453 | return -EFAULT; | |
454 | ||
455 | ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); | |
f9ead18c JA |
456 | if (ret) |
457 | return ret; | |
458 | ||
459 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
7fa875b8 | 460 | if (msg.msg_iovlen == 0) { |
5702196e DY |
461 | sr->len = iomsg->fast_iov[0].iov_len = 0; |
462 | iomsg->fast_iov[0].iov_base = NULL; | |
463 | iomsg->free_iov = NULL; | |
7fa875b8 | 464 | } else if (msg.msg_iovlen > 1) { |
f9ead18c | 465 | return -EINVAL; |
5702196e | 466 | } else { |
7fa875b8 | 467 | if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) |
5702196e DY |
468 | return -EFAULT; |
469 | sr->len = iomsg->fast_iov[0].iov_len; | |
470 | iomsg->free_iov = NULL; | |
471 | } | |
9bb66906 DY |
472 | |
473 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
474 | iomsg->namelen = msg.msg_namelen; | |
475 | iomsg->controllen = msg.msg_controllen; | |
476 | if (io_recvmsg_multishot_overflow(iomsg)) | |
477 | return -EOVERFLOW; | |
478 | } | |
f9ead18c JA |
479 | } else { |
480 | iomsg->free_iov = iomsg->fast_iov; | |
de4eda9d | 481 | ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, |
f9ead18c JA |
482 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
483 | false); | |
484 | if (ret > 0) | |
485 | ret = 0; | |
486 | } | |
487 | ||
488 | return ret; | |
489 | } | |
490 | ||
491 | #ifdef CONFIG_COMPAT | |
492 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
493 | struct io_async_msghdr *iomsg) | |
494 | { | |
f2ccb5ae | 495 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
72c531f8 | 496 | struct compat_msghdr msg; |
f9ead18c | 497 | struct compat_iovec __user *uiov; |
f9ead18c JA |
498 | int ret; |
499 | ||
72c531f8 DY |
500 | if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) |
501 | return -EFAULT; | |
502 | ||
4f6a94d3 | 503 | ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); |
f9ead18c JA |
504 | if (ret) |
505 | return ret; | |
506 | ||
72c531f8 | 507 | uiov = compat_ptr(msg.msg_iov); |
f9ead18c JA |
508 | if (req->flags & REQ_F_BUFFER_SELECT) { |
509 | compat_ssize_t clen; | |
510 | ||
990a4de5 | 511 | iomsg->free_iov = NULL; |
72c531f8 | 512 | if (msg.msg_iovlen == 0) { |
6d2f75a0 | 513 | sr->len = 0; |
72c531f8 | 514 | } else if (msg.msg_iovlen > 1) { |
f9ead18c | 515 | return -EINVAL; |
6d2f75a0 DY |
516 | } else { |
517 | if (!access_ok(uiov, sizeof(*uiov))) | |
518 | return -EFAULT; | |
519 | if (__get_user(clen, &uiov->iov_len)) | |
520 | return -EFAULT; | |
521 | if (clen < 0) | |
522 | return -EINVAL; | |
523 | sr->len = clen; | |
6d2f75a0 | 524 | } |
9bb66906 DY |
525 | |
526 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
527 | iomsg->namelen = msg.msg_namelen; | |
528 | iomsg->controllen = msg.msg_controllen; | |
529 | if (io_recvmsg_multishot_overflow(iomsg)) | |
530 | return -EOVERFLOW; | |
531 | } | |
f9ead18c JA |
532 | } else { |
533 | iomsg->free_iov = iomsg->fast_iov; | |
de4eda9d | 534 | ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen, |
f9ead18c JA |
535 | UIO_FASTIOV, &iomsg->free_iov, |
536 | &iomsg->msg.msg_iter, true); | |
537 | if (ret < 0) | |
538 | return ret; | |
539 | } | |
540 | ||
541 | return 0; | |
542 | } | |
543 | #endif | |
544 | ||
545 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, | |
546 | struct io_async_msghdr *iomsg) | |
547 | { | |
548 | iomsg->msg.msg_name = &iomsg->addr; | |
c21a8027 | 549 | iomsg->msg.msg_iter.nr_segs = 0; |
f9ead18c JA |
550 | |
551 | #ifdef CONFIG_COMPAT | |
552 | if (req->ctx->compat) | |
553 | return __io_compat_recvmsg_copy_hdr(req, iomsg); | |
554 | #endif | |
555 | ||
556 | return __io_recvmsg_copy_hdr(req, iomsg); | |
557 | } | |
558 | ||
559 | int io_recvmsg_prep_async(struct io_kiocb *req) | |
560 | { | |
561 | int ret; | |
562 | ||
858c293e PB |
563 | if (!io_msg_alloc_async_prep(req)) |
564 | return -ENOMEM; | |
f9ead18c JA |
565 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
566 | if (!ret) | |
567 | req->flags |= REQ_F_NEED_CLEANUP; | |
568 | return ret; | |
569 | } | |
570 | ||
b3fdea6e DY |
571 | #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) |
572 | ||
f9ead18c JA |
573 | int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
574 | { | |
f2ccb5ae | 575 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
576 | |
577 | if (unlikely(sqe->file_index || sqe->addr2)) | |
578 | return -EINVAL; | |
579 | ||
580 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
581 | sr->len = READ_ONCE(sqe->len); | |
582 | sr->flags = READ_ONCE(sqe->ioprio); | |
b3fdea6e | 583 | if (sr->flags & ~(RECVMSG_FLAGS)) |
f9ead18c | 584 | return -EINVAL; |
7605c43d | 585 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
f9ead18c JA |
586 | if (sr->msg_flags & MSG_DONTWAIT) |
587 | req->flags |= REQ_F_NOWAIT; | |
588 | if (sr->msg_flags & MSG_ERRQUEUE) | |
589 | req->flags |= REQ_F_CLEAR_POLLIN; | |
b3fdea6e DY |
590 | if (sr->flags & IORING_RECV_MULTISHOT) { |
591 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
592 | return -EINVAL; | |
593 | if (sr->msg_flags & MSG_WAITALL) | |
594 | return -EINVAL; | |
595 | if (req->opcode == IORING_OP_RECV && sr->len) | |
596 | return -EINVAL; | |
597 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
b00c51ef JA |
598 | /* |
599 | * Store the buffer group for this multishot receive separately, | |
600 | * as if we end up doing an io-wq based issue that selects a | |
601 | * buffer, it has to be committed immediately and that will | |
602 | * clear ->buf_list. This means we lose the link to the buffer | |
603 | * list, and the eventual buffer put on completion then cannot | |
604 | * restore it. | |
605 | */ | |
606 | sr->buf_group = req->buf_index; | |
b3fdea6e | 607 | } |
f9ead18c JA |
608 | |
609 | #ifdef CONFIG_COMPAT | |
610 | if (req->ctx->compat) | |
611 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
612 | #endif | |
613 | sr->done_io = 0; | |
614 | return 0; | |
615 | } | |
616 | ||
b3fdea6e DY |
617 | static inline void io_recv_prep_retry(struct io_kiocb *req) |
618 | { | |
f2ccb5ae | 619 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
b3fdea6e DY |
620 | |
621 | sr->done_io = 0; | |
622 | sr->len = 0; /* get from the provided buffer */ | |
b00c51ef | 623 | req->buf_index = sr->buf_group; |
b3fdea6e DY |
624 | } |
625 | ||
626 | /* | |
9bb66906 | 627 | * Finishes io_recv and io_recvmsg. |
b3fdea6e DY |
628 | * |
629 | * Returns true if it is actually finished, or false if it should run | |
630 | * again (for multishot). | |
631 | */ | |
9bb66906 | 632 | static inline bool io_recv_finish(struct io_kiocb *req, int *ret, |
7d41bcb7 | 633 | struct msghdr *msg, bool mshot_finished, |
100d6b17 | 634 | unsigned issue_flags) |
b3fdea6e | 635 | { |
7d41bcb7 JA |
636 | unsigned int cflags; |
637 | ||
638 | cflags = io_put_kbuf(req, issue_flags); | |
b65db921 | 639 | if (msg->msg_inq && msg->msg_inq != -1) |
7d41bcb7 JA |
640 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; |
641 | ||
b3fdea6e DY |
642 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { |
643 | io_req_set_res(req, *ret, cflags); | |
644 | *ret = IOU_OK; | |
645 | return true; | |
646 | } | |
647 | ||
9bb66906 | 648 | if (!mshot_finished) { |
b6b2bb58 PB |
649 | if (io_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER, |
650 | *ret, cflags | IORING_CQE_F_MORE)) { | |
b3fdea6e | 651 | io_recv_prep_retry(req); |
a2741c58 JA |
652 | /* Known not-empty or unknown state, retry */ |
653 | if (cflags & IORING_CQE_F_SOCK_NONEMPTY || | |
b65db921 | 654 | msg->msg_inq == -1) |
a2741c58 JA |
655 | return false; |
656 | if (issue_flags & IO_URING_F_MULTISHOT) | |
657 | *ret = IOU_ISSUE_SKIP_COMPLETE; | |
658 | else | |
659 | *ret = -EAGAIN; | |
660 | return true; | |
b3fdea6e | 661 | } |
e2ad599d | 662 | /* Otherwise stop multishot but use the current result. */ |
b3fdea6e DY |
663 | } |
664 | ||
665 | io_req_set_res(req, *ret, cflags); | |
666 | ||
100d6b17 | 667 | if (issue_flags & IO_URING_F_MULTISHOT) |
b3fdea6e | 668 | *ret = IOU_STOP_MULTISHOT; |
e2df2ccb DY |
669 | else |
670 | *ret = IOU_OK; | |
b3fdea6e DY |
671 | return true; |
672 | } | |
673 | ||
9bb66906 DY |
674 | static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg, |
675 | struct io_sr_msg *sr, void __user **buf, | |
676 | size_t *len) | |
677 | { | |
678 | unsigned long ubuf = (unsigned long) *buf; | |
679 | unsigned long hdr; | |
680 | ||
681 | hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + | |
682 | kmsg->controllen; | |
683 | if (*len < hdr) | |
684 | return -EFAULT; | |
685 | ||
686 | if (kmsg->controllen) { | |
687 | unsigned long control = ubuf + hdr - kmsg->controllen; | |
688 | ||
d1f6222c | 689 | kmsg->msg.msg_control_user = (void __user *) control; |
9bb66906 DY |
690 | kmsg->msg.msg_controllen = kmsg->controllen; |
691 | } | |
692 | ||
693 | sr->buf = *buf; /* stash for later copy */ | |
d1f6222c | 694 | *buf = (void __user *) (ubuf + hdr); |
9bb66906 DY |
695 | kmsg->payloadlen = *len = *len - hdr; |
696 | return 0; | |
697 | } | |
698 | ||
699 | struct io_recvmsg_multishot_hdr { | |
700 | struct io_uring_recvmsg_out msg; | |
701 | struct sockaddr_storage addr; | |
702 | }; | |
703 | ||
704 | static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io, | |
705 | struct io_async_msghdr *kmsg, | |
706 | unsigned int flags, bool *finished) | |
707 | { | |
708 | int err; | |
709 | int copy_len; | |
710 | struct io_recvmsg_multishot_hdr hdr; | |
711 | ||
712 | if (kmsg->namelen) | |
713 | kmsg->msg.msg_name = &hdr.addr; | |
714 | kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
715 | kmsg->msg.msg_namelen = 0; | |
716 | ||
717 | if (sock->file->f_flags & O_NONBLOCK) | |
718 | flags |= MSG_DONTWAIT; | |
719 | ||
720 | err = sock_recvmsg(sock, &kmsg->msg, flags); | |
721 | *finished = err <= 0; | |
722 | if (err < 0) | |
723 | return err; | |
724 | ||
725 | hdr.msg = (struct io_uring_recvmsg_out) { | |
726 | .controllen = kmsg->controllen - kmsg->msg.msg_controllen, | |
727 | .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT | |
728 | }; | |
729 | ||
730 | hdr.msg.payloadlen = err; | |
731 | if (err > kmsg->payloadlen) | |
732 | err = kmsg->payloadlen; | |
733 | ||
734 | copy_len = sizeof(struct io_uring_recvmsg_out); | |
735 | if (kmsg->msg.msg_namelen > kmsg->namelen) | |
736 | copy_len += kmsg->namelen; | |
737 | else | |
738 | copy_len += kmsg->msg.msg_namelen; | |
739 | ||
740 | /* | |
741 | * "fromlen shall refer to the value before truncation.." | |
742 | * 1003.1g | |
743 | */ | |
744 | hdr.msg.namelen = kmsg->msg.msg_namelen; | |
745 | ||
746 | /* ensure that there is no gap between hdr and sockaddr_storage */ | |
747 | BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) != | |
748 | sizeof(struct io_uring_recvmsg_out)); | |
749 | if (copy_to_user(io->buf, &hdr, copy_len)) { | |
750 | *finished = true; | |
751 | return -EFAULT; | |
752 | } | |
753 | ||
754 | return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + | |
755 | kmsg->controllen + err; | |
756 | } | |
757 | ||
f9ead18c JA |
758 | int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
759 | { | |
f2ccb5ae | 760 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
761 | struct io_async_msghdr iomsg, *kmsg; |
762 | struct socket *sock; | |
f9ead18c JA |
763 | unsigned flags; |
764 | int ret, min_ret = 0; | |
765 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
9bb66906 | 766 | bool mshot_finished = true; |
f9ead18c JA |
767 | |
768 | sock = sock_from_file(req->file); | |
769 | if (unlikely(!sock)) | |
770 | return -ENOTSOCK; | |
771 | ||
772 | if (req_has_async_data(req)) { | |
773 | kmsg = req->async_data; | |
774 | } else { | |
775 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
776 | if (ret) | |
777 | return ret; | |
778 | kmsg = &iomsg; | |
779 | } | |
780 | ||
781 | if (!(req->flags & REQ_F_POLLED) && | |
782 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
43e0bbbd | 783 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 784 | |
17add5ce PB |
785 | if (!io_check_multishot(req, issue_flags)) |
786 | return io_setup_async_msg(req, kmsg, issue_flags); | |
787 | ||
9bb66906 | 788 | retry_multishot: |
f9ead18c JA |
789 | if (io_do_buffer_select(req)) { |
790 | void __user *buf; | |
9bb66906 | 791 | size_t len = sr->len; |
f9ead18c | 792 | |
9bb66906 | 793 | buf = io_buffer_select(req, &len, issue_flags); |
f9ead18c JA |
794 | if (!buf) |
795 | return -ENOBUFS; | |
9bb66906 DY |
796 | |
797 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
798 | ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); | |
799 | if (ret) { | |
800 | io_kbuf_recycle(req, issue_flags); | |
801 | return ret; | |
802 | } | |
803 | } | |
804 | ||
4b61152e | 805 | iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len); |
f9ead18c JA |
806 | } |
807 | ||
808 | flags = sr->msg_flags; | |
809 | if (force_nonblock) | |
810 | flags |= MSG_DONTWAIT; | |
f9ead18c JA |
811 | |
812 | kmsg->msg.msg_get_inq = 1; | |
b65db921 | 813 | kmsg->msg.msg_inq = -1; |
78d0d206 | 814 | if (req->flags & REQ_F_APOLL_MULTISHOT) { |
9bb66906 DY |
815 | ret = io_recvmsg_multishot(sock, sr, kmsg, flags, |
816 | &mshot_finished); | |
78d0d206 JA |
817 | } else { |
818 | /* disable partial retry for recvmsg with cmsg attached */ | |
819 | if (flags & MSG_WAITALL && !kmsg->msg.msg_controllen) | |
820 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
821 | ||
9bb66906 DY |
822 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, |
823 | kmsg->uaddr, flags); | |
78d0d206 | 824 | } |
9bb66906 | 825 | |
f9ead18c | 826 | if (ret < min_ret) { |
9bb66906 DY |
827 | if (ret == -EAGAIN && force_nonblock) { |
828 | ret = io_setup_async_msg(req, kmsg, issue_flags); | |
100d6b17 | 829 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) { |
9bb66906 DY |
830 | io_kbuf_recycle(req, issue_flags); |
831 | return IOU_ISSUE_SKIP_COMPLETE; | |
832 | } | |
833 | return ret; | |
834 | } | |
f9ead18c JA |
835 | if (ret > 0 && io_net_retry(sock, flags)) { |
836 | sr->done_io += ret; | |
837 | req->flags |= REQ_F_PARTIAL_IO; | |
43e0bbbd | 838 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 839 | } |
95eafc74 PB |
840 | if (ret == -ERESTARTSYS) |
841 | ret = -EINTR; | |
f9ead18c JA |
842 | req_set_fail(req); |
843 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
844 | req_set_fail(req); | |
845 | } | |
846 | ||
d4e097da | 847 | if (ret > 0) |
f9ead18c JA |
848 | ret += sr->done_io; |
849 | else if (sr->done_io) | |
850 | ret = sr->done_io; | |
d4e097da DY |
851 | else |
852 | io_kbuf_recycle(req, issue_flags); | |
853 | ||
7d41bcb7 | 854 | if (!io_recv_finish(req, &ret, &kmsg->msg, mshot_finished, issue_flags)) |
9bb66906 DY |
855 | goto retry_multishot; |
856 | ||
857 | if (mshot_finished) { | |
9bb66906 DY |
858 | /* fast path, check for non-NULL to avoid function call */ |
859 | if (kmsg->free_iov) | |
860 | kfree(kmsg->free_iov); | |
6c3e8955 | 861 | io_netmsg_recycle(req, issue_flags); |
9bb66906 DY |
862 | req->flags &= ~REQ_F_NEED_CLEANUP; |
863 | } | |
864 | ||
865 | return ret; | |
f9ead18c JA |
866 | } |
867 | ||
868 | int io_recv(struct io_kiocb *req, unsigned int issue_flags) | |
869 | { | |
f2ccb5ae | 870 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
871 | struct msghdr msg; |
872 | struct socket *sock; | |
f9ead18c JA |
873 | unsigned flags; |
874 | int ret, min_ret = 0; | |
875 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
b3fdea6e | 876 | size_t len = sr->len; |
f9ead18c JA |
877 | |
878 | if (!(req->flags & REQ_F_POLLED) && | |
879 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
880 | return -EAGAIN; | |
881 | ||
17add5ce PB |
882 | if (!io_check_multishot(req, issue_flags)) |
883 | return -EAGAIN; | |
884 | ||
f9ead18c JA |
885 | sock = sock_from_file(req->file); |
886 | if (unlikely(!sock)) | |
887 | return -ENOTSOCK; | |
888 | ||
bf34e697 JA |
889 | msg.msg_name = NULL; |
890 | msg.msg_namelen = 0; | |
891 | msg.msg_control = NULL; | |
892 | msg.msg_get_inq = 1; | |
893 | msg.msg_controllen = 0; | |
894 | msg.msg_iocb = NULL; | |
895 | msg.msg_ubuf = NULL; | |
896 | ||
b3fdea6e | 897 | retry_multishot: |
f9ead18c JA |
898 | if (io_do_buffer_select(req)) { |
899 | void __user *buf; | |
900 | ||
b3fdea6e | 901 | buf = io_buffer_select(req, &len, issue_flags); |
f9ead18c JA |
902 | if (!buf) |
903 | return -ENOBUFS; | |
904 | sr->buf = buf; | |
905 | } | |
906 | ||
4b61152e | 907 | ret = import_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter); |
f9ead18c JA |
908 | if (unlikely(ret)) |
909 | goto out_free; | |
910 | ||
b65db921 | 911 | msg.msg_inq = -1; |
f9ead18c | 912 | msg.msg_flags = 0; |
f9ead18c JA |
913 | |
914 | flags = sr->msg_flags; | |
915 | if (force_nonblock) | |
916 | flags |= MSG_DONTWAIT; | |
917 | if (flags & MSG_WAITALL) | |
918 | min_ret = iov_iter_count(&msg.msg_iter); | |
919 | ||
920 | ret = sock_recvmsg(sock, &msg, flags); | |
921 | if (ret < min_ret) { | |
b3fdea6e | 922 | if (ret == -EAGAIN && force_nonblock) { |
100d6b17 | 923 | if (issue_flags & IO_URING_F_MULTISHOT) { |
b3fdea6e DY |
924 | io_kbuf_recycle(req, issue_flags); |
925 | return IOU_ISSUE_SKIP_COMPLETE; | |
926 | } | |
927 | ||
f9ead18c | 928 | return -EAGAIN; |
b3fdea6e | 929 | } |
f9ead18c JA |
930 | if (ret > 0 && io_net_retry(sock, flags)) { |
931 | sr->len -= ret; | |
932 | sr->buf += ret; | |
933 | sr->done_io += ret; | |
934 | req->flags |= REQ_F_PARTIAL_IO; | |
935 | return -EAGAIN; | |
936 | } | |
95eafc74 PB |
937 | if (ret == -ERESTARTSYS) |
938 | ret = -EINTR; | |
f9ead18c JA |
939 | req_set_fail(req); |
940 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
941 | out_free: | |
942 | req_set_fail(req); | |
943 | } | |
944 | ||
d4e097da | 945 | if (ret > 0) |
f9ead18c JA |
946 | ret += sr->done_io; |
947 | else if (sr->done_io) | |
948 | ret = sr->done_io; | |
d4e097da DY |
949 | else |
950 | io_kbuf_recycle(req, issue_flags); | |
951 | ||
7d41bcb7 | 952 | if (!io_recv_finish(req, &ret, &msg, ret <= 0, issue_flags)) |
b3fdea6e DY |
953 | goto retry_multishot; |
954 | ||
955 | return ret; | |
f9ead18c JA |
956 | } |
957 | ||
b0e9b551 | 958 | void io_send_zc_cleanup(struct io_kiocb *req) |
b48c312b | 959 | { |
ac9e5784 | 960 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
493108d9 | 961 | struct io_async_msghdr *io; |
b48c312b | 962 | |
493108d9 PB |
963 | if (req_has_async_data(req)) { |
964 | io = req->async_data; | |
4c17a496 PB |
965 | /* might be ->fast_iov if *msg_copy_hdr failed */ |
966 | if (io->free_iov != io->fast_iov) | |
967 | kfree(io->free_iov); | |
493108d9 | 968 | } |
a75155fa | 969 | if (zc->notif) { |
a75155fa PB |
970 | io_notif_flush(zc->notif); |
971 | zc->notif = NULL; | |
972 | } | |
b48c312b PB |
973 | } |
974 | ||
40725d1b PB |
975 | #define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF) |
976 | #define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE) | |
977 | ||
b0e9b551 | 978 | int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
06a5464b | 979 | { |
ac9e5784 | 980 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
10c7d33e | 981 | struct io_ring_ctx *ctx = req->ctx; |
b48c312b | 982 | struct io_kiocb *notif; |
06a5464b | 983 | |
493108d9 | 984 | if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3))) |
b48c312b PB |
985 | return -EINVAL; |
986 | /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */ | |
987 | if (req->flags & REQ_F_CQE_SKIP) | |
06a5464b PB |
988 | return -EINVAL; |
989 | ||
e3366e02 PB |
990 | notif = zc->notif = io_alloc_notif(ctx); |
991 | if (!notif) | |
992 | return -ENOMEM; | |
993 | notif->cqe.user_data = req->cqe.user_data; | |
994 | notif->cqe.res = 0; | |
995 | notif->cqe.flags = IORING_CQE_F_NOTIF; | |
996 | req->flags |= REQ_F_NEED_CLEANUP; | |
40725d1b PB |
997 | |
998 | zc->flags = READ_ONCE(sqe->ioprio); | |
999 | if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) { | |
1000 | if (zc->flags & ~IO_ZC_FLAGS_VALID) | |
1001 | return -EINVAL; | |
1002 | if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) { | |
1003 | io_notif_set_extended(notif); | |
1004 | io_notif_to_data(notif)->zc_report = true; | |
1005 | } | |
1006 | } | |
1007 | ||
10c7d33e PB |
1008 | if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
1009 | unsigned idx = READ_ONCE(sqe->buf_index); | |
1010 | ||
1011 | if (unlikely(idx >= ctx->nr_user_bufs)) | |
1012 | return -EFAULT; | |
1013 | idx = array_index_nospec(idx, ctx->nr_user_bufs); | |
1014 | req->imu = READ_ONCE(ctx->user_bufs[idx]); | |
e3366e02 | 1015 | io_req_set_rsrc_node(notif, ctx, 0); |
10c7d33e | 1016 | } |
06a5464b | 1017 | |
493108d9 PB |
1018 | if (req->opcode == IORING_OP_SEND_ZC) { |
1019 | if (READ_ONCE(sqe->__pad3[0])) | |
1020 | return -EINVAL; | |
1021 | zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
1022 | zc->addr_len = READ_ONCE(sqe->addr_len); | |
1023 | } else { | |
1024 | if (unlikely(sqe->addr2 || sqe->file_index)) | |
1025 | return -EINVAL; | |
1026 | if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF)) | |
1027 | return -EINVAL; | |
1028 | } | |
1029 | ||
06a5464b PB |
1030 | zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1031 | zc->len = READ_ONCE(sqe->len); | |
1032 | zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
06a5464b PB |
1033 | if (zc->msg_flags & MSG_DONTWAIT) |
1034 | req->flags |= REQ_F_NOWAIT; | |
092aeedb | 1035 | |
4a933e62 | 1036 | zc->done_io = 0; |
092aeedb | 1037 | |
06a5464b PB |
1038 | #ifdef CONFIG_COMPAT |
1039 | if (req->ctx->compat) | |
1040 | zc->msg_flags |= MSG_CMSG_COMPAT; | |
1041 | #endif | |
1042 | return 0; | |
1043 | } | |
1044 | ||
cd9021e8 PB |
1045 | static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb, |
1046 | struct iov_iter *from, size_t length) | |
1047 | { | |
1048 | skb_zcopy_downgrade_managed(skb); | |
1049 | return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); | |
1050 | } | |
1051 | ||
3ff1a0d3 PB |
1052 | static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, |
1053 | struct iov_iter *from, size_t length) | |
1054 | { | |
1055 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
1056 | int frag = shinfo->nr_frags; | |
1057 | int ret = 0; | |
1058 | struct bvec_iter bi; | |
1059 | ssize_t copied = 0; | |
1060 | unsigned long truesize = 0; | |
1061 | ||
cd9021e8 | 1062 | if (!frag) |
3ff1a0d3 | 1063 | shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; |
cd9021e8 | 1064 | else if (unlikely(!skb_zcopy_managed(skb))) |
3ff1a0d3 | 1065 | return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); |
3ff1a0d3 PB |
1066 | |
1067 | bi.bi_size = min(from->count, length); | |
1068 | bi.bi_bvec_done = from->iov_offset; | |
1069 | bi.bi_idx = 0; | |
1070 | ||
1071 | while (bi.bi_size && frag < MAX_SKB_FRAGS) { | |
1072 | struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); | |
1073 | ||
1074 | copied += v.bv_len; | |
1075 | truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); | |
1076 | __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, | |
1077 | v.bv_offset, v.bv_len); | |
1078 | bvec_iter_advance_single(from->bvec, &bi, v.bv_len); | |
1079 | } | |
1080 | if (bi.bi_size) | |
1081 | ret = -EMSGSIZE; | |
1082 | ||
1083 | shinfo->nr_frags = frag; | |
1084 | from->bvec += bi.bi_idx; | |
1085 | from->nr_segs -= bi.bi_idx; | |
dfb58b17 | 1086 | from->count -= copied; |
3ff1a0d3 PB |
1087 | from->iov_offset = bi.bi_bvec_done; |
1088 | ||
1089 | skb->data_len += copied; | |
1090 | skb->len += copied; | |
1091 | skb->truesize += truesize; | |
1092 | ||
1093 | if (sk && sk->sk_type == SOCK_STREAM) { | |
1094 | sk_wmem_queued_add(sk, truesize); | |
1095 | if (!skb_zcopy_pure(skb)) | |
1096 | sk_mem_charge(sk, truesize); | |
1097 | } else { | |
1098 | refcount_add(truesize, &skb->sk->sk_wmem_alloc); | |
1099 | } | |
1100 | return ret; | |
1101 | } | |
1102 | ||
b0e9b551 | 1103 | int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) |
06a5464b | 1104 | { |
6ae61b7a | 1105 | struct sockaddr_storage __address; |
ac9e5784 | 1106 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
06a5464b | 1107 | struct msghdr msg; |
06a5464b | 1108 | struct socket *sock; |
6ae91ac9 | 1109 | unsigned msg_flags; |
06a5464b PB |
1110 | int ret, min_ret = 0; |
1111 | ||
06a5464b PB |
1112 | sock = sock_from_file(req->file); |
1113 | if (unlikely(!sock)) | |
1114 | return -ENOTSOCK; | |
edf81438 PB |
1115 | if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) |
1116 | return -EOPNOTSUPP; | |
06a5464b | 1117 | |
06a5464b PB |
1118 | msg.msg_name = NULL; |
1119 | msg.msg_control = NULL; | |
1120 | msg.msg_controllen = 0; | |
1121 | msg.msg_namelen = 0; | |
1122 | ||
86dc8f23 | 1123 | if (zc->addr) { |
581711c4 PB |
1124 | if (req_has_async_data(req)) { |
1125 | struct io_async_msghdr *io = req->async_data; | |
1126 | ||
6ae61b7a | 1127 | msg.msg_name = &io->addr; |
581711c4 PB |
1128 | } else { |
1129 | ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); | |
1130 | if (unlikely(ret < 0)) | |
1131 | return ret; | |
1132 | msg.msg_name = (struct sockaddr *)&__address; | |
581711c4 | 1133 | } |
86dc8f23 PB |
1134 | msg.msg_namelen = zc->addr_len; |
1135 | } | |
1136 | ||
3c840053 PB |
1137 | if (!(req->flags & REQ_F_POLLED) && |
1138 | (zc->flags & IORING_RECVSEND_POLL_FIRST)) | |
6ae61b7a | 1139 | return io_setup_async_addr(req, &__address, issue_flags); |
3c840053 | 1140 | |
10c7d33e | 1141 | if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
de4eda9d | 1142 | ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu, |
10c7d33e PB |
1143 | (u64)(uintptr_t)zc->buf, zc->len); |
1144 | if (unlikely(ret)) | |
986e263d | 1145 | return ret; |
cd9021e8 | 1146 | msg.sg_from_iter = io_sg_from_iter; |
10c7d33e | 1147 | } else { |
42385b02 | 1148 | io_notif_set_extended(zc->notif); |
4b61152e | 1149 | ret = import_ubuf(ITER_SOURCE, zc->buf, zc->len, &msg.msg_iter); |
10c7d33e PB |
1150 | if (unlikely(ret)) |
1151 | return ret; | |
b48c312b | 1152 | ret = io_notif_account_mem(zc->notif, zc->len); |
2e32ba56 PB |
1153 | if (unlikely(ret)) |
1154 | return ret; | |
cd9021e8 | 1155 | msg.sg_from_iter = io_sg_from_iter_iovec; |
10c7d33e | 1156 | } |
06a5464b PB |
1157 | |
1158 | msg_flags = zc->msg_flags | MSG_ZEROCOPY; | |
1159 | if (issue_flags & IO_URING_F_NONBLOCK) | |
1160 | msg_flags |= MSG_DONTWAIT; | |
1161 | if (msg_flags & MSG_WAITALL) | |
1162 | min_ret = iov_iter_count(&msg.msg_iter); | |
b841b901 | 1163 | msg_flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; |
06a5464b PB |
1164 | |
1165 | msg.msg_flags = msg_flags; | |
b48c312b | 1166 | msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; |
06a5464b PB |
1167 | ret = sock_sendmsg(sock, &msg); |
1168 | ||
1169 | if (unlikely(ret < min_ret)) { | |
1170 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
6ae61b7a | 1171 | return io_setup_async_addr(req, &__address, issue_flags); |
581711c4 | 1172 | |
4a933e62 PB |
1173 | if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { |
1174 | zc->len -= ret; | |
1175 | zc->buf += ret; | |
1176 | zc->done_io += ret; | |
1177 | req->flags |= REQ_F_PARTIAL_IO; | |
6ae61b7a | 1178 | return io_setup_async_addr(req, &__address, issue_flags); |
4a933e62 PB |
1179 | } |
1180 | if (ret == -ERESTARTSYS) | |
1181 | ret = -EINTR; | |
5a848b7c | 1182 | req_set_fail(req); |
06a5464b PB |
1183 | } |
1184 | ||
4a933e62 PB |
1185 | if (ret >= 0) |
1186 | ret += zc->done_io; | |
1187 | else if (zc->done_io) | |
1188 | ret = zc->done_io; | |
b48c312b | 1189 | |
108893dd PB |
1190 | /* |
1191 | * If we're in io-wq we can't rely on tw ordering guarantees, defer | |
1192 | * flushing notif to io_send_zc_cleanup() | |
1193 | */ | |
1194 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { | |
1195 | io_notif_flush(zc->notif); | |
1196 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
1197 | } | |
6ae91ac9 | 1198 | io_req_set_res(req, ret, IORING_CQE_F_MORE); |
06a5464b PB |
1199 | return IOU_OK; |
1200 | } | |
1201 | ||
493108d9 PB |
1202 | int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags) |
1203 | { | |
1204 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); | |
1205 | struct io_async_msghdr iomsg, *kmsg; | |
1206 | struct socket *sock; | |
6ae91ac9 | 1207 | unsigned flags; |
493108d9 PB |
1208 | int ret, min_ret = 0; |
1209 | ||
42385b02 PB |
1210 | io_notif_set_extended(sr->notif); |
1211 | ||
493108d9 PB |
1212 | sock = sock_from_file(req->file); |
1213 | if (unlikely(!sock)) | |
1214 | return -ENOTSOCK; | |
cc767e7c PB |
1215 | if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) |
1216 | return -EOPNOTSUPP; | |
493108d9 PB |
1217 | |
1218 | if (req_has_async_data(req)) { | |
1219 | kmsg = req->async_data; | |
1220 | } else { | |
1221 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
1222 | if (ret) | |
1223 | return ret; | |
1224 | kmsg = &iomsg; | |
1225 | } | |
1226 | ||
1227 | if (!(req->flags & REQ_F_POLLED) && | |
1228 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
1229 | return io_setup_async_msg(req, kmsg, issue_flags); | |
1230 | ||
1231 | flags = sr->msg_flags | MSG_ZEROCOPY; | |
1232 | if (issue_flags & IO_URING_F_NONBLOCK) | |
1233 | flags |= MSG_DONTWAIT; | |
1234 | if (flags & MSG_WAITALL) | |
1235 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
1236 | ||
1237 | kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg; | |
1238 | kmsg->msg.sg_from_iter = io_sg_from_iter_iovec; | |
1239 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); | |
1240 | ||
1241 | if (unlikely(ret < min_ret)) { | |
1242 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
1243 | return io_setup_async_msg(req, kmsg, issue_flags); | |
1244 | ||
1245 | if (ret > 0 && io_net_retry(sock, flags)) { | |
1246 | sr->done_io += ret; | |
1247 | req->flags |= REQ_F_PARTIAL_IO; | |
1248 | return io_setup_async_msg(req, kmsg, issue_flags); | |
1249 | } | |
493108d9 PB |
1250 | if (ret == -ERESTARTSYS) |
1251 | ret = -EINTR; | |
1252 | req_set_fail(req); | |
1253 | } | |
1254 | /* fast path, check for non-NULL to avoid function call */ | |
108893dd | 1255 | if (kmsg->free_iov) { |
493108d9 | 1256 | kfree(kmsg->free_iov); |
108893dd PB |
1257 | kmsg->free_iov = NULL; |
1258 | } | |
493108d9 PB |
1259 | |
1260 | io_netmsg_recycle(req, issue_flags); | |
1261 | if (ret >= 0) | |
1262 | ret += sr->done_io; | |
1263 | else if (sr->done_io) | |
1264 | ret = sr->done_io; | |
1265 | ||
108893dd PB |
1266 | /* |
1267 | * If we're in io-wq we can't rely on tw ordering guarantees, defer | |
1268 | * flushing notif to io_send_zc_cleanup() | |
1269 | */ | |
1270 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { | |
1271 | io_notif_flush(sr->notif); | |
1272 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
1273 | } | |
6ae91ac9 | 1274 | io_req_set_res(req, ret, IORING_CQE_F_MORE); |
493108d9 PB |
1275 | return IOU_OK; |
1276 | } | |
1277 | ||
7e6b638e PB |
1278 | void io_sendrecv_fail(struct io_kiocb *req) |
1279 | { | |
1280 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); | |
7e6b638e PB |
1281 | |
1282 | if (req->flags & REQ_F_PARTIAL_IO) | |
6ae91ac9 PB |
1283 | req->cqe.res = sr->done_io; |
1284 | ||
c4c0009e | 1285 | if ((req->flags & REQ_F_NEED_CLEANUP) && |
6ae91ac9 PB |
1286 | (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) |
1287 | req->cqe.flags |= IORING_CQE_F_MORE; | |
5693bcce PB |
1288 | } |
1289 | ||
f9ead18c JA |
1290 | int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
1291 | { | |
f2ccb5ae | 1292 | struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
f9ead18c JA |
1293 | unsigned flags; |
1294 | ||
1295 | if (sqe->len || sqe->buf_index) | |
1296 | return -EINVAL; | |
1297 | ||
1298 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
1299 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
1300 | accept->flags = READ_ONCE(sqe->accept_flags); | |
1301 | accept->nofile = rlimit(RLIMIT_NOFILE); | |
1302 | flags = READ_ONCE(sqe->ioprio); | |
1303 | if (flags & ~IORING_ACCEPT_MULTISHOT) | |
1304 | return -EINVAL; | |
1305 | ||
1306 | accept->file_slot = READ_ONCE(sqe->file_index); | |
1307 | if (accept->file_slot) { | |
1308 | if (accept->flags & SOCK_CLOEXEC) | |
1309 | return -EINVAL; | |
1310 | if (flags & IORING_ACCEPT_MULTISHOT && | |
1311 | accept->file_slot != IORING_FILE_INDEX_ALLOC) | |
1312 | return -EINVAL; | |
1313 | } | |
1314 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1315 | return -EINVAL; | |
1316 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
1317 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1318 | if (flags & IORING_ACCEPT_MULTISHOT) | |
1319 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
1320 | return 0; | |
1321 | } | |
1322 | ||
1323 | int io_accept(struct io_kiocb *req, unsigned int issue_flags) | |
1324 | { | |
f2ccb5ae | 1325 | struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
f9ead18c JA |
1326 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
1327 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; | |
1328 | bool fixed = !!accept->file_slot; | |
1329 | struct file *file; | |
1330 | int ret, fd; | |
1331 | ||
17add5ce PB |
1332 | if (!io_check_multishot(req, issue_flags)) |
1333 | return -EAGAIN; | |
f9ead18c JA |
1334 | retry: |
1335 | if (!fixed) { | |
1336 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
1337 | if (unlikely(fd < 0)) | |
1338 | return fd; | |
1339 | } | |
1340 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, | |
1341 | accept->flags); | |
1342 | if (IS_ERR(file)) { | |
1343 | if (!fixed) | |
1344 | put_unused_fd(fd); | |
1345 | ret = PTR_ERR(file); | |
1346 | if (ret == -EAGAIN && force_nonblock) { | |
1347 | /* | |
1348 | * if it's multishot and polled, we don't need to | |
1349 | * return EAGAIN to arm the poll infra since it | |
1350 | * has already been done | |
1351 | */ | |
91482864 | 1352 | if (issue_flags & IO_URING_F_MULTISHOT) |
f9ead18c JA |
1353 | ret = IOU_ISSUE_SKIP_COMPLETE; |
1354 | return ret; | |
1355 | } | |
1356 | if (ret == -ERESTARTSYS) | |
1357 | ret = -EINTR; | |
1358 | req_set_fail(req); | |
1359 | } else if (!fixed) { | |
1360 | fd_install(fd, file); | |
1361 | ret = fd; | |
1362 | } else { | |
1363 | ret = io_fixed_fd_install(req, issue_flags, file, | |
1364 | accept->file_slot); | |
1365 | } | |
1366 | ||
1367 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
1368 | io_req_set_res(req, ret, 0); | |
1369 | return IOU_OK; | |
1370 | } | |
f9ead18c | 1371 | |
515e2696 DY |
1372 | if (ret < 0) |
1373 | return ret; | |
b6b2bb58 PB |
1374 | if (io_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER, |
1375 | ret, IORING_CQE_F_MORE)) | |
d245bca6 | 1376 | goto retry; |
cbd25748 | 1377 | |
515e2696 | 1378 | return -ECANCELED; |
f9ead18c JA |
1379 | } |
1380 | ||
1381 | int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
1382 | { | |
f2ccb5ae | 1383 | struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
f9ead18c JA |
1384 | |
1385 | if (sqe->addr || sqe->rw_flags || sqe->buf_index) | |
1386 | return -EINVAL; | |
1387 | ||
1388 | sock->domain = READ_ONCE(sqe->fd); | |
1389 | sock->type = READ_ONCE(sqe->off); | |
1390 | sock->protocol = READ_ONCE(sqe->len); | |
1391 | sock->file_slot = READ_ONCE(sqe->file_index); | |
1392 | sock->nofile = rlimit(RLIMIT_NOFILE); | |
1393 | ||
1394 | sock->flags = sock->type & ~SOCK_TYPE_MASK; | |
1395 | if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) | |
1396 | return -EINVAL; | |
1397 | if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1398 | return -EINVAL; | |
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | int io_socket(struct io_kiocb *req, unsigned int issue_flags) | |
1403 | { | |
f2ccb5ae | 1404 | struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
f9ead18c JA |
1405 | bool fixed = !!sock->file_slot; |
1406 | struct file *file; | |
1407 | int ret, fd; | |
1408 | ||
1409 | if (!fixed) { | |
1410 | fd = __get_unused_fd_flags(sock->flags, sock->nofile); | |
1411 | if (unlikely(fd < 0)) | |
1412 | return fd; | |
1413 | } | |
1414 | file = __sys_socket_file(sock->domain, sock->type, sock->protocol); | |
1415 | if (IS_ERR(file)) { | |
1416 | if (!fixed) | |
1417 | put_unused_fd(fd); | |
1418 | ret = PTR_ERR(file); | |
1419 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
1420 | return -EAGAIN; | |
1421 | if (ret == -ERESTARTSYS) | |
1422 | ret = -EINTR; | |
1423 | req_set_fail(req); | |
1424 | } else if (!fixed) { | |
1425 | fd_install(fd, file); | |
1426 | ret = fd; | |
1427 | } else { | |
1428 | ret = io_fixed_fd_install(req, issue_flags, file, | |
1429 | sock->file_slot); | |
1430 | } | |
1431 | io_req_set_res(req, ret, 0); | |
1432 | return IOU_OK; | |
1433 | } | |
1434 | ||
1435 | int io_connect_prep_async(struct io_kiocb *req) | |
1436 | { | |
1437 | struct io_async_connect *io = req->async_data; | |
f2ccb5ae | 1438 | struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1439 | |
1440 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
1441 | } | |
1442 | ||
1443 | int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
1444 | { | |
f2ccb5ae | 1445 | struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1446 | |
1447 | if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) | |
1448 | return -EINVAL; | |
1449 | ||
1450 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
1451 | conn->addr_len = READ_ONCE(sqe->addr2); | |
74e2e17e | 1452 | conn->in_progress = conn->seen_econnaborted = false; |
f9ead18c JA |
1453 | return 0; |
1454 | } | |
1455 | ||
1456 | int io_connect(struct io_kiocb *req, unsigned int issue_flags) | |
1457 | { | |
f2ccb5ae | 1458 | struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1459 | struct io_async_connect __io, *io; |
1460 | unsigned file_flags; | |
1461 | int ret; | |
1462 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
1463 | ||
3fb1bd68 JA |
1464 | if (connect->in_progress) { |
1465 | struct socket *socket; | |
1466 | ||
1467 | ret = -ENOTSOCK; | |
1468 | socket = sock_from_file(req->file); | |
1469 | if (socket) | |
1470 | ret = sock_error(socket->sk); | |
1471 | goto out; | |
1472 | } | |
1473 | ||
f9ead18c JA |
1474 | if (req_has_async_data(req)) { |
1475 | io = req->async_data; | |
1476 | } else { | |
1477 | ret = move_addr_to_kernel(connect->addr, | |
1478 | connect->addr_len, | |
1479 | &__io.address); | |
1480 | if (ret) | |
1481 | goto out; | |
1482 | io = &__io; | |
1483 | } | |
1484 | ||
1485 | file_flags = force_nonblock ? O_NONBLOCK : 0; | |
1486 | ||
1487 | ret = __sys_connect_file(req->file, &io->address, | |
1488 | connect->addr_len, file_flags); | |
74e2e17e JA |
1489 | if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED) |
1490 | && force_nonblock) { | |
3fb1bd68 JA |
1491 | if (ret == -EINPROGRESS) { |
1492 | connect->in_progress = true; | |
74e2e17e JA |
1493 | return -EAGAIN; |
1494 | } | |
1495 | if (ret == -ECONNABORTED) { | |
1496 | if (connect->seen_econnaborted) | |
3fb1bd68 | 1497 | goto out; |
74e2e17e JA |
1498 | connect->seen_econnaborted = true; |
1499 | } | |
1500 | if (req_has_async_data(req)) | |
1501 | return -EAGAIN; | |
1502 | if (io_alloc_async_data(req)) { | |
1503 | ret = -ENOMEM; | |
1504 | goto out; | |
f9ead18c | 1505 | } |
74e2e17e | 1506 | memcpy(req->async_data, &__io, sizeof(__io)); |
f9ead18c JA |
1507 | return -EAGAIN; |
1508 | } | |
1509 | if (ret == -ERESTARTSYS) | |
1510 | ret = -EINTR; | |
1511 | out: | |
1512 | if (ret < 0) | |
1513 | req_set_fail(req); | |
1514 | io_req_set_res(req, ret, 0); | |
1515 | return IOU_OK; | |
1516 | } | |
43e0bbbd JA |
1517 | |
1518 | void io_netmsg_cache_free(struct io_cache_entry *entry) | |
1519 | { | |
1520 | kfree(container_of(entry, struct io_async_msghdr, cache)); | |
1521 | } | |
f9ead18c | 1522 | #endif |