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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; | |
f9ead18c | 186 | /* if were using fast_iov, set it to the new one */ |
4b61152e | 187 | if (iter_is_iovec(&kmsg->msg.msg_iter) && !kmsg->free_iov) { |
de4f5fed JA |
188 | size_t fast_idx = iter_iov(&kmsg->msg.msg_iter) - kmsg->fast_iov; |
189 | async_msg->msg.msg_iter.__iov = &async_msg->fast_iov[fast_idx]; | |
3e4cb6eb | 190 | } |
f9ead18c JA |
191 | |
192 | return -EAGAIN; | |
193 | } | |
194 | ||
195 | static int io_sendmsg_copy_hdr(struct io_kiocb *req, | |
196 | struct io_async_msghdr *iomsg) | |
197 | { | |
f2ccb5ae | 198 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
cac9e441 | 199 | int ret; |
f9ead18c JA |
200 | |
201 | iomsg->msg.msg_name = &iomsg->addr; | |
202 | iomsg->free_iov = iomsg->fast_iov; | |
cac9e441 | 203 | ret = sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, |
f9ead18c | 204 | &iomsg->free_iov); |
cac9e441 | 205 | /* save msg_control as sys_sendmsg() overwrites it */ |
26fed836 | 206 | sr->msg_control = iomsg->msg.msg_control_user; |
cac9e441 | 207 | return ret; |
f9ead18c JA |
208 | } |
209 | ||
516e82f0 | 210 | int io_send_prep_async(struct io_kiocb *req) |
581711c4 | 211 | { |
ac9e5784 | 212 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
581711c4 PB |
213 | struct io_async_msghdr *io; |
214 | int ret; | |
215 | ||
216 | if (!zc->addr || req_has_async_data(req)) | |
217 | return 0; | |
6bf8ad25 PB |
218 | io = io_msg_alloc_async_prep(req); |
219 | if (!io) | |
581711c4 | 220 | return -ENOMEM; |
581711c4 PB |
221 | ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); |
222 | return ret; | |
223 | } | |
224 | ||
225 | static int io_setup_async_addr(struct io_kiocb *req, | |
6ae61b7a | 226 | struct sockaddr_storage *addr_storage, |
581711c4 PB |
227 | unsigned int issue_flags) |
228 | { | |
6ae61b7a | 229 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
581711c4 PB |
230 | struct io_async_msghdr *io; |
231 | ||
6ae61b7a | 232 | if (!sr->addr || req_has_async_data(req)) |
581711c4 | 233 | return -EAGAIN; |
6bf8ad25 PB |
234 | io = io_msg_alloc_async(req, issue_flags); |
235 | if (!io) | |
581711c4 | 236 | return -ENOMEM; |
6ae61b7a | 237 | memcpy(&io->addr, addr_storage, sizeof(io->addr)); |
581711c4 PB |
238 | return -EAGAIN; |
239 | } | |
240 | ||
f9ead18c JA |
241 | int io_sendmsg_prep_async(struct io_kiocb *req) |
242 | { | |
243 | int ret; | |
244 | ||
858c293e PB |
245 | if (!io_msg_alloc_async_prep(req)) |
246 | return -ENOMEM; | |
f9ead18c JA |
247 | ret = io_sendmsg_copy_hdr(req, req->async_data); |
248 | if (!ret) | |
249 | req->flags |= REQ_F_NEED_CLEANUP; | |
250 | return ret; | |
251 | } | |
252 | ||
253 | void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) | |
254 | { | |
255 | struct io_async_msghdr *io = req->async_data; | |
256 | ||
257 | kfree(io->free_iov); | |
258 | } | |
259 | ||
260 | int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
261 | { | |
f2ccb5ae | 262 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c | 263 | |
516e82f0 PB |
264 | if (req->opcode == IORING_OP_SEND) { |
265 | if (READ_ONCE(sqe->__pad3[0])) | |
266 | return -EINVAL; | |
267 | sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
268 | sr->addr_len = READ_ONCE(sqe->addr_len); | |
269 | } else if (sqe->addr2 || sqe->file_index) { | |
f9ead18c | 270 | return -EINVAL; |
516e82f0 | 271 | } |
f9ead18c JA |
272 | |
273 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
274 | sr->len = READ_ONCE(sqe->len); | |
275 | sr->flags = READ_ONCE(sqe->ioprio); | |
276 | if (sr->flags & ~IORING_RECVSEND_POLL_FIRST) | |
277 | return -EINVAL; | |
278 | sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
279 | if (sr->msg_flags & MSG_DONTWAIT) | |
280 | req->flags |= REQ_F_NOWAIT; | |
281 | ||
282 | #ifdef CONFIG_COMPAT | |
283 | if (req->ctx->compat) | |
284 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
285 | #endif | |
286 | sr->done_io = 0; | |
287 | return 0; | |
288 | } | |
289 | ||
290 | int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) | |
291 | { | |
f2ccb5ae | 292 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
293 | struct io_async_msghdr iomsg, *kmsg; |
294 | struct socket *sock; | |
295 | unsigned flags; | |
296 | int min_ret = 0; | |
297 | int ret; | |
298 | ||
299 | sock = sock_from_file(req->file); | |
300 | if (unlikely(!sock)) | |
301 | return -ENOTSOCK; | |
302 | ||
303 | if (req_has_async_data(req)) { | |
304 | kmsg = req->async_data; | |
26fed836 | 305 | kmsg->msg.msg_control_user = sr->msg_control; |
f9ead18c JA |
306 | } else { |
307 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
308 | if (ret) | |
309 | return ret; | |
310 | kmsg = &iomsg; | |
311 | } | |
312 | ||
313 | if (!(req->flags & REQ_F_POLLED) && | |
314 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
43e0bbbd | 315 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c JA |
316 | |
317 | flags = sr->msg_flags; | |
318 | if (issue_flags & IO_URING_F_NONBLOCK) | |
319 | flags |= MSG_DONTWAIT; | |
320 | if (flags & MSG_WAITALL) | |
321 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
322 | ||
323 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); | |
324 | ||
325 | if (ret < min_ret) { | |
326 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
43e0bbbd | 327 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 328 | if (ret > 0 && io_net_retry(sock, flags)) { |
b1dc4920 JA |
329 | kmsg->msg.msg_controllen = 0; |
330 | kmsg->msg.msg_control = NULL; | |
f9ead18c JA |
331 | sr->done_io += ret; |
332 | req->flags |= REQ_F_PARTIAL_IO; | |
43e0bbbd | 333 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 334 | } |
95eafc74 PB |
335 | if (ret == -ERESTARTSYS) |
336 | ret = -EINTR; | |
f9ead18c JA |
337 | req_set_fail(req); |
338 | } | |
339 | /* fast path, check for non-NULL to avoid function call */ | |
340 | if (kmsg->free_iov) | |
341 | kfree(kmsg->free_iov); | |
342 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
43e0bbbd | 343 | io_netmsg_recycle(req, issue_flags); |
f9ead18c JA |
344 | if (ret >= 0) |
345 | ret += sr->done_io; | |
346 | else if (sr->done_io) | |
347 | ret = sr->done_io; | |
348 | io_req_set_res(req, ret, 0); | |
349 | return IOU_OK; | |
350 | } | |
351 | ||
352 | int io_send(struct io_kiocb *req, unsigned int issue_flags) | |
353 | { | |
516e82f0 | 354 | struct sockaddr_storage __address; |
f2ccb5ae | 355 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c | 356 | struct msghdr msg; |
f9ead18c JA |
357 | struct socket *sock; |
358 | unsigned flags; | |
359 | int min_ret = 0; | |
360 | int ret; | |
361 | ||
04360d3e PB |
362 | msg.msg_name = NULL; |
363 | msg.msg_control = NULL; | |
364 | msg.msg_controllen = 0; | |
365 | msg.msg_namelen = 0; | |
366 | msg.msg_ubuf = NULL; | |
367 | ||
516e82f0 PB |
368 | if (sr->addr) { |
369 | if (req_has_async_data(req)) { | |
370 | struct io_async_msghdr *io = req->async_data; | |
371 | ||
372 | msg.msg_name = &io->addr; | |
373 | } else { | |
374 | ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address); | |
375 | if (unlikely(ret < 0)) | |
376 | return ret; | |
377 | msg.msg_name = (struct sockaddr *)&__address; | |
378 | } | |
379 | msg.msg_namelen = sr->addr_len; | |
380 | } | |
381 | ||
f9ead18c JA |
382 | if (!(req->flags & REQ_F_POLLED) && |
383 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
516e82f0 | 384 | return io_setup_async_addr(req, &__address, issue_flags); |
f9ead18c JA |
385 | |
386 | sock = sock_from_file(req->file); | |
387 | if (unlikely(!sock)) | |
388 | return -ENOTSOCK; | |
389 | ||
4b61152e | 390 | ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter); |
f9ead18c JA |
391 | if (unlikely(ret)) |
392 | return ret; | |
393 | ||
f9ead18c JA |
394 | flags = sr->msg_flags; |
395 | if (issue_flags & IO_URING_F_NONBLOCK) | |
396 | flags |= MSG_DONTWAIT; | |
397 | if (flags & MSG_WAITALL) | |
398 | min_ret = iov_iter_count(&msg.msg_iter); | |
399 | ||
400 | msg.msg_flags = flags; | |
401 | ret = sock_sendmsg(sock, &msg); | |
402 | if (ret < min_ret) { | |
403 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
516e82f0 PB |
404 | return io_setup_async_addr(req, &__address, issue_flags); |
405 | ||
f9ead18c JA |
406 | if (ret > 0 && io_net_retry(sock, flags)) { |
407 | sr->len -= ret; | |
408 | sr->buf += ret; | |
409 | sr->done_io += ret; | |
410 | req->flags |= REQ_F_PARTIAL_IO; | |
516e82f0 | 411 | return io_setup_async_addr(req, &__address, issue_flags); |
f9ead18c | 412 | } |
95eafc74 PB |
413 | if (ret == -ERESTARTSYS) |
414 | ret = -EINTR; | |
f9ead18c JA |
415 | req_set_fail(req); |
416 | } | |
417 | if (ret >= 0) | |
418 | ret += sr->done_io; | |
419 | else if (sr->done_io) | |
420 | ret = sr->done_io; | |
421 | io_req_set_res(req, ret, 0); | |
422 | return IOU_OK; | |
423 | } | |
424 | ||
9bb66906 DY |
425 | static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) |
426 | { | |
9b0fc3c0 | 427 | int hdr; |
9bb66906 | 428 | |
9b0fc3c0 | 429 | if (iomsg->namelen < 0) |
9bb66906 | 430 | return true; |
9b0fc3c0 DY |
431 | if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), |
432 | iomsg->namelen, &hdr)) | |
9bb66906 | 433 | return true; |
9b0fc3c0 | 434 | if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) |
9bb66906 DY |
435 | return true; |
436 | ||
437 | return false; | |
438 | } | |
439 | ||
f9ead18c JA |
440 | static int __io_recvmsg_copy_hdr(struct io_kiocb *req, |
441 | struct io_async_msghdr *iomsg) | |
442 | { | |
f2ccb5ae | 443 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
7fa875b8 | 444 | struct user_msghdr msg; |
f9ead18c JA |
445 | int ret; |
446 | ||
7fa875b8 DY |
447 | if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) |
448 | return -EFAULT; | |
449 | ||
450 | ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); | |
f9ead18c JA |
451 | if (ret) |
452 | return ret; | |
453 | ||
454 | if (req->flags & REQ_F_BUFFER_SELECT) { | |
7fa875b8 | 455 | if (msg.msg_iovlen == 0) { |
5702196e DY |
456 | sr->len = iomsg->fast_iov[0].iov_len = 0; |
457 | iomsg->fast_iov[0].iov_base = NULL; | |
458 | iomsg->free_iov = NULL; | |
7fa875b8 | 459 | } else if (msg.msg_iovlen > 1) { |
f9ead18c | 460 | return -EINVAL; |
5702196e | 461 | } else { |
7fa875b8 | 462 | if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) |
5702196e DY |
463 | return -EFAULT; |
464 | sr->len = iomsg->fast_iov[0].iov_len; | |
465 | iomsg->free_iov = NULL; | |
466 | } | |
9bb66906 DY |
467 | |
468 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
469 | iomsg->namelen = msg.msg_namelen; | |
470 | iomsg->controllen = msg.msg_controllen; | |
471 | if (io_recvmsg_multishot_overflow(iomsg)) | |
472 | return -EOVERFLOW; | |
473 | } | |
f9ead18c JA |
474 | } else { |
475 | iomsg->free_iov = iomsg->fast_iov; | |
de4eda9d | 476 | ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, |
f9ead18c JA |
477 | &iomsg->free_iov, &iomsg->msg.msg_iter, |
478 | false); | |
479 | if (ret > 0) | |
480 | ret = 0; | |
481 | } | |
482 | ||
483 | return ret; | |
484 | } | |
485 | ||
486 | #ifdef CONFIG_COMPAT | |
487 | static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, | |
488 | struct io_async_msghdr *iomsg) | |
489 | { | |
f2ccb5ae | 490 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
72c531f8 | 491 | struct compat_msghdr msg; |
f9ead18c | 492 | struct compat_iovec __user *uiov; |
f9ead18c JA |
493 | int ret; |
494 | ||
72c531f8 DY |
495 | if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) |
496 | return -EFAULT; | |
497 | ||
4f6a94d3 | 498 | ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); |
f9ead18c JA |
499 | if (ret) |
500 | return ret; | |
501 | ||
72c531f8 | 502 | uiov = compat_ptr(msg.msg_iov); |
f9ead18c JA |
503 | if (req->flags & REQ_F_BUFFER_SELECT) { |
504 | compat_ssize_t clen; | |
505 | ||
990a4de5 | 506 | iomsg->free_iov = NULL; |
72c531f8 | 507 | if (msg.msg_iovlen == 0) { |
6d2f75a0 | 508 | sr->len = 0; |
72c531f8 | 509 | } else if (msg.msg_iovlen > 1) { |
f9ead18c | 510 | return -EINVAL; |
6d2f75a0 DY |
511 | } else { |
512 | if (!access_ok(uiov, sizeof(*uiov))) | |
513 | return -EFAULT; | |
514 | if (__get_user(clen, &uiov->iov_len)) | |
515 | return -EFAULT; | |
516 | if (clen < 0) | |
517 | return -EINVAL; | |
518 | sr->len = clen; | |
6d2f75a0 | 519 | } |
9bb66906 DY |
520 | |
521 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
522 | iomsg->namelen = msg.msg_namelen; | |
523 | iomsg->controllen = msg.msg_controllen; | |
524 | if (io_recvmsg_multishot_overflow(iomsg)) | |
525 | return -EOVERFLOW; | |
526 | } | |
f9ead18c JA |
527 | } else { |
528 | iomsg->free_iov = iomsg->fast_iov; | |
de4eda9d | 529 | ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen, |
f9ead18c JA |
530 | UIO_FASTIOV, &iomsg->free_iov, |
531 | &iomsg->msg.msg_iter, true); | |
532 | if (ret < 0) | |
533 | return ret; | |
534 | } | |
535 | ||
536 | return 0; | |
537 | } | |
538 | #endif | |
539 | ||
540 | static int io_recvmsg_copy_hdr(struct io_kiocb *req, | |
541 | struct io_async_msghdr *iomsg) | |
542 | { | |
543 | iomsg->msg.msg_name = &iomsg->addr; | |
544 | ||
545 | #ifdef CONFIG_COMPAT | |
546 | if (req->ctx->compat) | |
547 | return __io_compat_recvmsg_copy_hdr(req, iomsg); | |
548 | #endif | |
549 | ||
550 | return __io_recvmsg_copy_hdr(req, iomsg); | |
551 | } | |
552 | ||
553 | int io_recvmsg_prep_async(struct io_kiocb *req) | |
554 | { | |
555 | int ret; | |
556 | ||
858c293e PB |
557 | if (!io_msg_alloc_async_prep(req)) |
558 | return -ENOMEM; | |
f9ead18c JA |
559 | ret = io_recvmsg_copy_hdr(req, req->async_data); |
560 | if (!ret) | |
561 | req->flags |= REQ_F_NEED_CLEANUP; | |
562 | return ret; | |
563 | } | |
564 | ||
b3fdea6e DY |
565 | #define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) |
566 | ||
f9ead18c JA |
567 | int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
568 | { | |
f2ccb5ae | 569 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
570 | |
571 | if (unlikely(sqe->file_index || sqe->addr2)) | |
572 | return -EINVAL; | |
573 | ||
574 | sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
575 | sr->len = READ_ONCE(sqe->len); | |
576 | sr->flags = READ_ONCE(sqe->ioprio); | |
b3fdea6e | 577 | if (sr->flags & ~(RECVMSG_FLAGS)) |
f9ead18c | 578 | return -EINVAL; |
7605c43d | 579 | sr->msg_flags = READ_ONCE(sqe->msg_flags); |
f9ead18c JA |
580 | if (sr->msg_flags & MSG_DONTWAIT) |
581 | req->flags |= REQ_F_NOWAIT; | |
582 | if (sr->msg_flags & MSG_ERRQUEUE) | |
583 | req->flags |= REQ_F_CLEAR_POLLIN; | |
b3fdea6e DY |
584 | if (sr->flags & IORING_RECV_MULTISHOT) { |
585 | if (!(req->flags & REQ_F_BUFFER_SELECT)) | |
586 | return -EINVAL; | |
587 | if (sr->msg_flags & MSG_WAITALL) | |
588 | return -EINVAL; | |
589 | if (req->opcode == IORING_OP_RECV && sr->len) | |
590 | return -EINVAL; | |
591 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
b00c51ef JA |
592 | /* |
593 | * Store the buffer group for this multishot receive separately, | |
594 | * as if we end up doing an io-wq based issue that selects a | |
595 | * buffer, it has to be committed immediately and that will | |
596 | * clear ->buf_list. This means we lose the link to the buffer | |
597 | * list, and the eventual buffer put on completion then cannot | |
598 | * restore it. | |
599 | */ | |
600 | sr->buf_group = req->buf_index; | |
b3fdea6e | 601 | } |
f9ead18c JA |
602 | |
603 | #ifdef CONFIG_COMPAT | |
604 | if (req->ctx->compat) | |
605 | sr->msg_flags |= MSG_CMSG_COMPAT; | |
606 | #endif | |
607 | sr->done_io = 0; | |
608 | return 0; | |
609 | } | |
610 | ||
b3fdea6e DY |
611 | static inline void io_recv_prep_retry(struct io_kiocb *req) |
612 | { | |
f2ccb5ae | 613 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
b3fdea6e DY |
614 | |
615 | sr->done_io = 0; | |
616 | sr->len = 0; /* get from the provided buffer */ | |
b00c51ef | 617 | req->buf_index = sr->buf_group; |
b3fdea6e DY |
618 | } |
619 | ||
620 | /* | |
9bb66906 | 621 | * Finishes io_recv and io_recvmsg. |
b3fdea6e DY |
622 | * |
623 | * Returns true if it is actually finished, or false if it should run | |
624 | * again (for multishot). | |
625 | */ | |
9bb66906 | 626 | static inline bool io_recv_finish(struct io_kiocb *req, int *ret, |
100d6b17 PB |
627 | unsigned int cflags, bool mshot_finished, |
628 | unsigned issue_flags) | |
b3fdea6e DY |
629 | { |
630 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
631 | io_req_set_res(req, *ret, cflags); | |
632 | *ret = IOU_OK; | |
633 | return true; | |
634 | } | |
635 | ||
9bb66906 | 636 | if (!mshot_finished) { |
9b8c5475 DY |
637 | if (io_aux_cqe(req->ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, |
638 | req->cqe.user_data, *ret, cflags | IORING_CQE_F_MORE, true)) { | |
b3fdea6e DY |
639 | io_recv_prep_retry(req); |
640 | return false; | |
641 | } | |
e2ad599d | 642 | /* Otherwise stop multishot but use the current result. */ |
b3fdea6e DY |
643 | } |
644 | ||
645 | io_req_set_res(req, *ret, cflags); | |
646 | ||
100d6b17 | 647 | if (issue_flags & IO_URING_F_MULTISHOT) |
b3fdea6e | 648 | *ret = IOU_STOP_MULTISHOT; |
e2df2ccb DY |
649 | else |
650 | *ret = IOU_OK; | |
b3fdea6e DY |
651 | return true; |
652 | } | |
653 | ||
9bb66906 DY |
654 | static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg, |
655 | struct io_sr_msg *sr, void __user **buf, | |
656 | size_t *len) | |
657 | { | |
658 | unsigned long ubuf = (unsigned long) *buf; | |
659 | unsigned long hdr; | |
660 | ||
661 | hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + | |
662 | kmsg->controllen; | |
663 | if (*len < hdr) | |
664 | return -EFAULT; | |
665 | ||
666 | if (kmsg->controllen) { | |
667 | unsigned long control = ubuf + hdr - kmsg->controllen; | |
668 | ||
d1f6222c | 669 | kmsg->msg.msg_control_user = (void __user *) control; |
9bb66906 DY |
670 | kmsg->msg.msg_controllen = kmsg->controllen; |
671 | } | |
672 | ||
673 | sr->buf = *buf; /* stash for later copy */ | |
d1f6222c | 674 | *buf = (void __user *) (ubuf + hdr); |
9bb66906 DY |
675 | kmsg->payloadlen = *len = *len - hdr; |
676 | return 0; | |
677 | } | |
678 | ||
679 | struct io_recvmsg_multishot_hdr { | |
680 | struct io_uring_recvmsg_out msg; | |
681 | struct sockaddr_storage addr; | |
682 | }; | |
683 | ||
684 | static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io, | |
685 | struct io_async_msghdr *kmsg, | |
686 | unsigned int flags, bool *finished) | |
687 | { | |
688 | int err; | |
689 | int copy_len; | |
690 | struct io_recvmsg_multishot_hdr hdr; | |
691 | ||
692 | if (kmsg->namelen) | |
693 | kmsg->msg.msg_name = &hdr.addr; | |
694 | kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT); | |
695 | kmsg->msg.msg_namelen = 0; | |
696 | ||
697 | if (sock->file->f_flags & O_NONBLOCK) | |
698 | flags |= MSG_DONTWAIT; | |
699 | ||
700 | err = sock_recvmsg(sock, &kmsg->msg, flags); | |
701 | *finished = err <= 0; | |
702 | if (err < 0) | |
703 | return err; | |
704 | ||
705 | hdr.msg = (struct io_uring_recvmsg_out) { | |
706 | .controllen = kmsg->controllen - kmsg->msg.msg_controllen, | |
707 | .flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT | |
708 | }; | |
709 | ||
710 | hdr.msg.payloadlen = err; | |
711 | if (err > kmsg->payloadlen) | |
712 | err = kmsg->payloadlen; | |
713 | ||
714 | copy_len = sizeof(struct io_uring_recvmsg_out); | |
715 | if (kmsg->msg.msg_namelen > kmsg->namelen) | |
716 | copy_len += kmsg->namelen; | |
717 | else | |
718 | copy_len += kmsg->msg.msg_namelen; | |
719 | ||
720 | /* | |
721 | * "fromlen shall refer to the value before truncation.." | |
722 | * 1003.1g | |
723 | */ | |
724 | hdr.msg.namelen = kmsg->msg.msg_namelen; | |
725 | ||
726 | /* ensure that there is no gap between hdr and sockaddr_storage */ | |
727 | BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) != | |
728 | sizeof(struct io_uring_recvmsg_out)); | |
729 | if (copy_to_user(io->buf, &hdr, copy_len)) { | |
730 | *finished = true; | |
731 | return -EFAULT; | |
732 | } | |
733 | ||
734 | return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen + | |
735 | kmsg->controllen + err; | |
736 | } | |
737 | ||
f9ead18c JA |
738 | int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags) |
739 | { | |
f2ccb5ae | 740 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
741 | struct io_async_msghdr iomsg, *kmsg; |
742 | struct socket *sock; | |
743 | unsigned int cflags; | |
744 | unsigned flags; | |
745 | int ret, min_ret = 0; | |
746 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
9bb66906 | 747 | bool mshot_finished = true; |
f9ead18c JA |
748 | |
749 | sock = sock_from_file(req->file); | |
750 | if (unlikely(!sock)) | |
751 | return -ENOTSOCK; | |
752 | ||
753 | if (req_has_async_data(req)) { | |
754 | kmsg = req->async_data; | |
755 | } else { | |
756 | ret = io_recvmsg_copy_hdr(req, &iomsg); | |
757 | if (ret) | |
758 | return ret; | |
759 | kmsg = &iomsg; | |
760 | } | |
761 | ||
762 | if (!(req->flags & REQ_F_POLLED) && | |
763 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
43e0bbbd | 764 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 765 | |
17add5ce PB |
766 | if (!io_check_multishot(req, issue_flags)) |
767 | return io_setup_async_msg(req, kmsg, issue_flags); | |
768 | ||
9bb66906 | 769 | retry_multishot: |
f9ead18c JA |
770 | if (io_do_buffer_select(req)) { |
771 | void __user *buf; | |
9bb66906 | 772 | size_t len = sr->len; |
f9ead18c | 773 | |
9bb66906 | 774 | buf = io_buffer_select(req, &len, issue_flags); |
f9ead18c JA |
775 | if (!buf) |
776 | return -ENOBUFS; | |
9bb66906 DY |
777 | |
778 | if (req->flags & REQ_F_APOLL_MULTISHOT) { | |
779 | ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); | |
780 | if (ret) { | |
781 | io_kbuf_recycle(req, issue_flags); | |
782 | return ret; | |
783 | } | |
784 | } | |
785 | ||
4b61152e | 786 | iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len); |
f9ead18c JA |
787 | } |
788 | ||
789 | flags = sr->msg_flags; | |
790 | if (force_nonblock) | |
791 | flags |= MSG_DONTWAIT; | |
f9ead18c JA |
792 | |
793 | kmsg->msg.msg_get_inq = 1; | |
78d0d206 | 794 | if (req->flags & REQ_F_APOLL_MULTISHOT) { |
9bb66906 DY |
795 | ret = io_recvmsg_multishot(sock, sr, kmsg, flags, |
796 | &mshot_finished); | |
78d0d206 JA |
797 | } else { |
798 | /* disable partial retry for recvmsg with cmsg attached */ | |
799 | if (flags & MSG_WAITALL && !kmsg->msg.msg_controllen) | |
800 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
801 | ||
9bb66906 DY |
802 | ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, |
803 | kmsg->uaddr, flags); | |
78d0d206 | 804 | } |
9bb66906 | 805 | |
f9ead18c | 806 | if (ret < min_ret) { |
9bb66906 DY |
807 | if (ret == -EAGAIN && force_nonblock) { |
808 | ret = io_setup_async_msg(req, kmsg, issue_flags); | |
100d6b17 | 809 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) { |
9bb66906 DY |
810 | io_kbuf_recycle(req, issue_flags); |
811 | return IOU_ISSUE_SKIP_COMPLETE; | |
812 | } | |
813 | return ret; | |
814 | } | |
f9ead18c JA |
815 | if (ret > 0 && io_net_retry(sock, flags)) { |
816 | sr->done_io += ret; | |
817 | req->flags |= REQ_F_PARTIAL_IO; | |
43e0bbbd | 818 | return io_setup_async_msg(req, kmsg, issue_flags); |
f9ead18c | 819 | } |
95eafc74 PB |
820 | if (ret == -ERESTARTSYS) |
821 | ret = -EINTR; | |
f9ead18c JA |
822 | req_set_fail(req); |
823 | } else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
824 | req_set_fail(req); | |
825 | } | |
826 | ||
d4e097da | 827 | if (ret > 0) |
f9ead18c JA |
828 | ret += sr->done_io; |
829 | else if (sr->done_io) | |
830 | ret = sr->done_io; | |
d4e097da DY |
831 | else |
832 | io_kbuf_recycle(req, issue_flags); | |
833 | ||
f9ead18c JA |
834 | cflags = io_put_kbuf(req, issue_flags); |
835 | if (kmsg->msg.msg_inq) | |
836 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; | |
b3fdea6e | 837 | |
100d6b17 | 838 | if (!io_recv_finish(req, &ret, cflags, mshot_finished, issue_flags)) |
9bb66906 DY |
839 | goto retry_multishot; |
840 | ||
841 | if (mshot_finished) { | |
9bb66906 DY |
842 | /* fast path, check for non-NULL to avoid function call */ |
843 | if (kmsg->free_iov) | |
844 | kfree(kmsg->free_iov); | |
6c3e8955 | 845 | io_netmsg_recycle(req, issue_flags); |
9bb66906 DY |
846 | req->flags &= ~REQ_F_NEED_CLEANUP; |
847 | } | |
848 | ||
849 | return ret; | |
f9ead18c JA |
850 | } |
851 | ||
852 | int io_recv(struct io_kiocb *req, unsigned int issue_flags) | |
853 | { | |
f2ccb5ae | 854 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
f9ead18c JA |
855 | struct msghdr msg; |
856 | struct socket *sock; | |
f9ead18c JA |
857 | unsigned int cflags; |
858 | unsigned flags; | |
859 | int ret, min_ret = 0; | |
860 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
b3fdea6e | 861 | size_t len = sr->len; |
f9ead18c JA |
862 | |
863 | if (!(req->flags & REQ_F_POLLED) && | |
864 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
865 | return -EAGAIN; | |
866 | ||
17add5ce PB |
867 | if (!io_check_multishot(req, issue_flags)) |
868 | return -EAGAIN; | |
869 | ||
f9ead18c JA |
870 | sock = sock_from_file(req->file); |
871 | if (unlikely(!sock)) | |
872 | return -ENOTSOCK; | |
873 | ||
b3fdea6e | 874 | retry_multishot: |
f9ead18c JA |
875 | if (io_do_buffer_select(req)) { |
876 | void __user *buf; | |
877 | ||
b3fdea6e | 878 | buf = io_buffer_select(req, &len, issue_flags); |
f9ead18c JA |
879 | if (!buf) |
880 | return -ENOBUFS; | |
881 | sr->buf = buf; | |
882 | } | |
883 | ||
4b61152e | 884 | ret = import_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter); |
f9ead18c JA |
885 | if (unlikely(ret)) |
886 | goto out_free; | |
887 | ||
888 | msg.msg_name = NULL; | |
889 | msg.msg_namelen = 0; | |
890 | msg.msg_control = NULL; | |
891 | msg.msg_get_inq = 1; | |
892 | msg.msg_flags = 0; | |
893 | msg.msg_controllen = 0; | |
894 | msg.msg_iocb = NULL; | |
e02b6651 | 895 | msg.msg_ubuf = NULL; |
f9ead18c JA |
896 | |
897 | flags = sr->msg_flags; | |
898 | if (force_nonblock) | |
899 | flags |= MSG_DONTWAIT; | |
900 | if (flags & MSG_WAITALL) | |
901 | min_ret = iov_iter_count(&msg.msg_iter); | |
902 | ||
903 | ret = sock_recvmsg(sock, &msg, flags); | |
904 | if (ret < min_ret) { | |
b3fdea6e | 905 | if (ret == -EAGAIN && force_nonblock) { |
100d6b17 | 906 | if (issue_flags & IO_URING_F_MULTISHOT) { |
b3fdea6e DY |
907 | io_kbuf_recycle(req, issue_flags); |
908 | return IOU_ISSUE_SKIP_COMPLETE; | |
909 | } | |
910 | ||
f9ead18c | 911 | return -EAGAIN; |
b3fdea6e | 912 | } |
f9ead18c JA |
913 | if (ret > 0 && io_net_retry(sock, flags)) { |
914 | sr->len -= ret; | |
915 | sr->buf += ret; | |
916 | sr->done_io += ret; | |
917 | req->flags |= REQ_F_PARTIAL_IO; | |
918 | return -EAGAIN; | |
919 | } | |
95eafc74 PB |
920 | if (ret == -ERESTARTSYS) |
921 | ret = -EINTR; | |
f9ead18c JA |
922 | req_set_fail(req); |
923 | } else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) { | |
924 | out_free: | |
925 | req_set_fail(req); | |
926 | } | |
927 | ||
d4e097da | 928 | if (ret > 0) |
f9ead18c JA |
929 | ret += sr->done_io; |
930 | else if (sr->done_io) | |
931 | ret = sr->done_io; | |
d4e097da DY |
932 | else |
933 | io_kbuf_recycle(req, issue_flags); | |
934 | ||
f9ead18c JA |
935 | cflags = io_put_kbuf(req, issue_flags); |
936 | if (msg.msg_inq) | |
937 | cflags |= IORING_CQE_F_SOCK_NONEMPTY; | |
b3fdea6e | 938 | |
100d6b17 | 939 | if (!io_recv_finish(req, &ret, cflags, ret <= 0, issue_flags)) |
b3fdea6e DY |
940 | goto retry_multishot; |
941 | ||
942 | return ret; | |
f9ead18c JA |
943 | } |
944 | ||
b0e9b551 | 945 | void io_send_zc_cleanup(struct io_kiocb *req) |
b48c312b | 946 | { |
ac9e5784 | 947 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
493108d9 | 948 | struct io_async_msghdr *io; |
b48c312b | 949 | |
493108d9 PB |
950 | if (req_has_async_data(req)) { |
951 | io = req->async_data; | |
4c17a496 PB |
952 | /* might be ->fast_iov if *msg_copy_hdr failed */ |
953 | if (io->free_iov != io->fast_iov) | |
954 | kfree(io->free_iov); | |
493108d9 | 955 | } |
a75155fa | 956 | if (zc->notif) { |
a75155fa PB |
957 | io_notif_flush(zc->notif); |
958 | zc->notif = NULL; | |
959 | } | |
b48c312b PB |
960 | } |
961 | ||
40725d1b PB |
962 | #define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF) |
963 | #define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE) | |
964 | ||
b0e9b551 | 965 | int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
06a5464b | 966 | { |
ac9e5784 | 967 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
10c7d33e | 968 | struct io_ring_ctx *ctx = req->ctx; |
b48c312b | 969 | struct io_kiocb *notif; |
06a5464b | 970 | |
493108d9 | 971 | if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3))) |
b48c312b PB |
972 | return -EINVAL; |
973 | /* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */ | |
974 | if (req->flags & REQ_F_CQE_SKIP) | |
06a5464b PB |
975 | return -EINVAL; |
976 | ||
e3366e02 PB |
977 | notif = zc->notif = io_alloc_notif(ctx); |
978 | if (!notif) | |
979 | return -ENOMEM; | |
980 | notif->cqe.user_data = req->cqe.user_data; | |
981 | notif->cqe.res = 0; | |
982 | notif->cqe.flags = IORING_CQE_F_NOTIF; | |
983 | req->flags |= REQ_F_NEED_CLEANUP; | |
40725d1b PB |
984 | |
985 | zc->flags = READ_ONCE(sqe->ioprio); | |
986 | if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) { | |
987 | if (zc->flags & ~IO_ZC_FLAGS_VALID) | |
988 | return -EINVAL; | |
989 | if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) { | |
990 | io_notif_set_extended(notif); | |
991 | io_notif_to_data(notif)->zc_report = true; | |
992 | } | |
993 | } | |
994 | ||
10c7d33e PB |
995 | if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
996 | unsigned idx = READ_ONCE(sqe->buf_index); | |
997 | ||
998 | if (unlikely(idx >= ctx->nr_user_bufs)) | |
999 | return -EFAULT; | |
1000 | idx = array_index_nospec(idx, ctx->nr_user_bufs); | |
1001 | req->imu = READ_ONCE(ctx->user_bufs[idx]); | |
e3366e02 | 1002 | io_req_set_rsrc_node(notif, ctx, 0); |
10c7d33e | 1003 | } |
06a5464b | 1004 | |
493108d9 PB |
1005 | if (req->opcode == IORING_OP_SEND_ZC) { |
1006 | if (READ_ONCE(sqe->__pad3[0])) | |
1007 | return -EINVAL; | |
1008 | zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
1009 | zc->addr_len = READ_ONCE(sqe->addr_len); | |
1010 | } else { | |
1011 | if (unlikely(sqe->addr2 || sqe->file_index)) | |
1012 | return -EINVAL; | |
1013 | if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF)) | |
1014 | return -EINVAL; | |
1015 | } | |
1016 | ||
06a5464b PB |
1017 | zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
1018 | zc->len = READ_ONCE(sqe->len); | |
1019 | zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; | |
06a5464b PB |
1020 | if (zc->msg_flags & MSG_DONTWAIT) |
1021 | req->flags |= REQ_F_NOWAIT; | |
092aeedb | 1022 | |
4a933e62 | 1023 | zc->done_io = 0; |
092aeedb | 1024 | |
06a5464b PB |
1025 | #ifdef CONFIG_COMPAT |
1026 | if (req->ctx->compat) | |
1027 | zc->msg_flags |= MSG_CMSG_COMPAT; | |
1028 | #endif | |
1029 | return 0; | |
1030 | } | |
1031 | ||
cd9021e8 PB |
1032 | static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb, |
1033 | struct iov_iter *from, size_t length) | |
1034 | { | |
1035 | skb_zcopy_downgrade_managed(skb); | |
1036 | return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); | |
1037 | } | |
1038 | ||
3ff1a0d3 PB |
1039 | static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb, |
1040 | struct iov_iter *from, size_t length) | |
1041 | { | |
1042 | struct skb_shared_info *shinfo = skb_shinfo(skb); | |
1043 | int frag = shinfo->nr_frags; | |
1044 | int ret = 0; | |
1045 | struct bvec_iter bi; | |
1046 | ssize_t copied = 0; | |
1047 | unsigned long truesize = 0; | |
1048 | ||
cd9021e8 | 1049 | if (!frag) |
3ff1a0d3 | 1050 | shinfo->flags |= SKBFL_MANAGED_FRAG_REFS; |
cd9021e8 | 1051 | else if (unlikely(!skb_zcopy_managed(skb))) |
3ff1a0d3 | 1052 | return __zerocopy_sg_from_iter(NULL, sk, skb, from, length); |
3ff1a0d3 PB |
1053 | |
1054 | bi.bi_size = min(from->count, length); | |
1055 | bi.bi_bvec_done = from->iov_offset; | |
1056 | bi.bi_idx = 0; | |
1057 | ||
1058 | while (bi.bi_size && frag < MAX_SKB_FRAGS) { | |
1059 | struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi); | |
1060 | ||
1061 | copied += v.bv_len; | |
1062 | truesize += PAGE_ALIGN(v.bv_len + v.bv_offset); | |
1063 | __skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page, | |
1064 | v.bv_offset, v.bv_len); | |
1065 | bvec_iter_advance_single(from->bvec, &bi, v.bv_len); | |
1066 | } | |
1067 | if (bi.bi_size) | |
1068 | ret = -EMSGSIZE; | |
1069 | ||
1070 | shinfo->nr_frags = frag; | |
1071 | from->bvec += bi.bi_idx; | |
1072 | from->nr_segs -= bi.bi_idx; | |
dfb58b17 | 1073 | from->count -= copied; |
3ff1a0d3 PB |
1074 | from->iov_offset = bi.bi_bvec_done; |
1075 | ||
1076 | skb->data_len += copied; | |
1077 | skb->len += copied; | |
1078 | skb->truesize += truesize; | |
1079 | ||
1080 | if (sk && sk->sk_type == SOCK_STREAM) { | |
1081 | sk_wmem_queued_add(sk, truesize); | |
1082 | if (!skb_zcopy_pure(skb)) | |
1083 | sk_mem_charge(sk, truesize); | |
1084 | } else { | |
1085 | refcount_add(truesize, &skb->sk->sk_wmem_alloc); | |
1086 | } | |
1087 | return ret; | |
1088 | } | |
1089 | ||
b0e9b551 | 1090 | int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) |
06a5464b | 1091 | { |
6ae61b7a | 1092 | struct sockaddr_storage __address; |
ac9e5784 | 1093 | struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
06a5464b | 1094 | struct msghdr msg; |
06a5464b | 1095 | struct socket *sock; |
6ae91ac9 | 1096 | unsigned msg_flags; |
06a5464b PB |
1097 | int ret, min_ret = 0; |
1098 | ||
06a5464b PB |
1099 | sock = sock_from_file(req->file); |
1100 | if (unlikely(!sock)) | |
1101 | return -ENOTSOCK; | |
edf81438 PB |
1102 | if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) |
1103 | return -EOPNOTSUPP; | |
06a5464b | 1104 | |
06a5464b PB |
1105 | msg.msg_name = NULL; |
1106 | msg.msg_control = NULL; | |
1107 | msg.msg_controllen = 0; | |
1108 | msg.msg_namelen = 0; | |
1109 | ||
86dc8f23 | 1110 | if (zc->addr) { |
581711c4 PB |
1111 | if (req_has_async_data(req)) { |
1112 | struct io_async_msghdr *io = req->async_data; | |
1113 | ||
6ae61b7a | 1114 | msg.msg_name = &io->addr; |
581711c4 PB |
1115 | } else { |
1116 | ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); | |
1117 | if (unlikely(ret < 0)) | |
1118 | return ret; | |
1119 | msg.msg_name = (struct sockaddr *)&__address; | |
581711c4 | 1120 | } |
86dc8f23 PB |
1121 | msg.msg_namelen = zc->addr_len; |
1122 | } | |
1123 | ||
3c840053 PB |
1124 | if (!(req->flags & REQ_F_POLLED) && |
1125 | (zc->flags & IORING_RECVSEND_POLL_FIRST)) | |
6ae61b7a | 1126 | return io_setup_async_addr(req, &__address, issue_flags); |
3c840053 | 1127 | |
10c7d33e | 1128 | if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
de4eda9d | 1129 | ret = io_import_fixed(ITER_SOURCE, &msg.msg_iter, req->imu, |
10c7d33e PB |
1130 | (u64)(uintptr_t)zc->buf, zc->len); |
1131 | if (unlikely(ret)) | |
986e263d | 1132 | return ret; |
cd9021e8 | 1133 | msg.sg_from_iter = io_sg_from_iter; |
10c7d33e | 1134 | } else { |
42385b02 | 1135 | io_notif_set_extended(zc->notif); |
4b61152e | 1136 | ret = import_ubuf(ITER_SOURCE, zc->buf, zc->len, &msg.msg_iter); |
10c7d33e PB |
1137 | if (unlikely(ret)) |
1138 | return ret; | |
b48c312b | 1139 | ret = io_notif_account_mem(zc->notif, zc->len); |
2e32ba56 PB |
1140 | if (unlikely(ret)) |
1141 | return ret; | |
cd9021e8 | 1142 | msg.sg_from_iter = io_sg_from_iter_iovec; |
10c7d33e | 1143 | } |
06a5464b PB |
1144 | |
1145 | msg_flags = zc->msg_flags | MSG_ZEROCOPY; | |
1146 | if (issue_flags & IO_URING_F_NONBLOCK) | |
1147 | msg_flags |= MSG_DONTWAIT; | |
1148 | if (msg_flags & MSG_WAITALL) | |
1149 | min_ret = iov_iter_count(&msg.msg_iter); | |
1150 | ||
1151 | msg.msg_flags = msg_flags; | |
b48c312b | 1152 | msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; |
06a5464b PB |
1153 | ret = sock_sendmsg(sock, &msg); |
1154 | ||
1155 | if (unlikely(ret < min_ret)) { | |
1156 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
6ae61b7a | 1157 | return io_setup_async_addr(req, &__address, issue_flags); |
581711c4 | 1158 | |
4a933e62 PB |
1159 | if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { |
1160 | zc->len -= ret; | |
1161 | zc->buf += ret; | |
1162 | zc->done_io += ret; | |
1163 | req->flags |= REQ_F_PARTIAL_IO; | |
6ae61b7a | 1164 | return io_setup_async_addr(req, &__address, issue_flags); |
4a933e62 PB |
1165 | } |
1166 | if (ret == -ERESTARTSYS) | |
1167 | ret = -EINTR; | |
5a848b7c | 1168 | req_set_fail(req); |
06a5464b PB |
1169 | } |
1170 | ||
4a933e62 PB |
1171 | if (ret >= 0) |
1172 | ret += zc->done_io; | |
1173 | else if (zc->done_io) | |
1174 | ret = zc->done_io; | |
b48c312b | 1175 | |
108893dd PB |
1176 | /* |
1177 | * If we're in io-wq we can't rely on tw ordering guarantees, defer | |
1178 | * flushing notif to io_send_zc_cleanup() | |
1179 | */ | |
1180 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { | |
1181 | io_notif_flush(zc->notif); | |
1182 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
1183 | } | |
6ae91ac9 | 1184 | io_req_set_res(req, ret, IORING_CQE_F_MORE); |
06a5464b PB |
1185 | return IOU_OK; |
1186 | } | |
1187 | ||
493108d9 PB |
1188 | int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags) |
1189 | { | |
1190 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); | |
1191 | struct io_async_msghdr iomsg, *kmsg; | |
1192 | struct socket *sock; | |
6ae91ac9 | 1193 | unsigned flags; |
493108d9 PB |
1194 | int ret, min_ret = 0; |
1195 | ||
42385b02 PB |
1196 | io_notif_set_extended(sr->notif); |
1197 | ||
493108d9 PB |
1198 | sock = sock_from_file(req->file); |
1199 | if (unlikely(!sock)) | |
1200 | return -ENOTSOCK; | |
cc767e7c PB |
1201 | if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags)) |
1202 | return -EOPNOTSUPP; | |
493108d9 PB |
1203 | |
1204 | if (req_has_async_data(req)) { | |
1205 | kmsg = req->async_data; | |
1206 | } else { | |
1207 | ret = io_sendmsg_copy_hdr(req, &iomsg); | |
1208 | if (ret) | |
1209 | return ret; | |
1210 | kmsg = &iomsg; | |
1211 | } | |
1212 | ||
1213 | if (!(req->flags & REQ_F_POLLED) && | |
1214 | (sr->flags & IORING_RECVSEND_POLL_FIRST)) | |
1215 | return io_setup_async_msg(req, kmsg, issue_flags); | |
1216 | ||
1217 | flags = sr->msg_flags | MSG_ZEROCOPY; | |
1218 | if (issue_flags & IO_URING_F_NONBLOCK) | |
1219 | flags |= MSG_DONTWAIT; | |
1220 | if (flags & MSG_WAITALL) | |
1221 | min_ret = iov_iter_count(&kmsg->msg.msg_iter); | |
1222 | ||
1223 | kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg; | |
1224 | kmsg->msg.sg_from_iter = io_sg_from_iter_iovec; | |
1225 | ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); | |
1226 | ||
1227 | if (unlikely(ret < min_ret)) { | |
1228 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
1229 | return io_setup_async_msg(req, kmsg, issue_flags); | |
1230 | ||
1231 | if (ret > 0 && io_net_retry(sock, flags)) { | |
1232 | sr->done_io += ret; | |
1233 | req->flags |= REQ_F_PARTIAL_IO; | |
1234 | return io_setup_async_msg(req, kmsg, issue_flags); | |
1235 | } | |
493108d9 PB |
1236 | if (ret == -ERESTARTSYS) |
1237 | ret = -EINTR; | |
1238 | req_set_fail(req); | |
1239 | } | |
1240 | /* fast path, check for non-NULL to avoid function call */ | |
108893dd | 1241 | if (kmsg->free_iov) { |
493108d9 | 1242 | kfree(kmsg->free_iov); |
108893dd PB |
1243 | kmsg->free_iov = NULL; |
1244 | } | |
493108d9 PB |
1245 | |
1246 | io_netmsg_recycle(req, issue_flags); | |
1247 | if (ret >= 0) | |
1248 | ret += sr->done_io; | |
1249 | else if (sr->done_io) | |
1250 | ret = sr->done_io; | |
1251 | ||
108893dd PB |
1252 | /* |
1253 | * If we're in io-wq we can't rely on tw ordering guarantees, defer | |
1254 | * flushing notif to io_send_zc_cleanup() | |
1255 | */ | |
1256 | if (!(issue_flags & IO_URING_F_UNLOCKED)) { | |
1257 | io_notif_flush(sr->notif); | |
1258 | req->flags &= ~REQ_F_NEED_CLEANUP; | |
1259 | } | |
6ae91ac9 | 1260 | io_req_set_res(req, ret, IORING_CQE_F_MORE); |
493108d9 PB |
1261 | return IOU_OK; |
1262 | } | |
1263 | ||
7e6b638e PB |
1264 | void io_sendrecv_fail(struct io_kiocb *req) |
1265 | { | |
1266 | struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); | |
7e6b638e PB |
1267 | |
1268 | if (req->flags & REQ_F_PARTIAL_IO) | |
6ae91ac9 PB |
1269 | req->cqe.res = sr->done_io; |
1270 | ||
c4c0009e | 1271 | if ((req->flags & REQ_F_NEED_CLEANUP) && |
6ae91ac9 PB |
1272 | (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) |
1273 | req->cqe.flags |= IORING_CQE_F_MORE; | |
5693bcce PB |
1274 | } |
1275 | ||
f9ead18c JA |
1276 | int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
1277 | { | |
f2ccb5ae | 1278 | struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
f9ead18c JA |
1279 | unsigned flags; |
1280 | ||
1281 | if (sqe->len || sqe->buf_index) | |
1282 | return -EINVAL; | |
1283 | ||
1284 | accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
1285 | accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2)); | |
1286 | accept->flags = READ_ONCE(sqe->accept_flags); | |
1287 | accept->nofile = rlimit(RLIMIT_NOFILE); | |
1288 | flags = READ_ONCE(sqe->ioprio); | |
1289 | if (flags & ~IORING_ACCEPT_MULTISHOT) | |
1290 | return -EINVAL; | |
1291 | ||
1292 | accept->file_slot = READ_ONCE(sqe->file_index); | |
1293 | if (accept->file_slot) { | |
1294 | if (accept->flags & SOCK_CLOEXEC) | |
1295 | return -EINVAL; | |
1296 | if (flags & IORING_ACCEPT_MULTISHOT && | |
1297 | accept->file_slot != IORING_FILE_INDEX_ALLOC) | |
1298 | return -EINVAL; | |
1299 | } | |
1300 | if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1301 | return -EINVAL; | |
1302 | if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK)) | |
1303 | accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK; | |
1304 | if (flags & IORING_ACCEPT_MULTISHOT) | |
1305 | req->flags |= REQ_F_APOLL_MULTISHOT; | |
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | int io_accept(struct io_kiocb *req, unsigned int issue_flags) | |
1310 | { | |
1311 | struct io_ring_ctx *ctx = req->ctx; | |
f2ccb5ae | 1312 | struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
f9ead18c JA |
1313 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
1314 | unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; | |
1315 | bool fixed = !!accept->file_slot; | |
1316 | struct file *file; | |
1317 | int ret, fd; | |
1318 | ||
17add5ce PB |
1319 | if (!io_check_multishot(req, issue_flags)) |
1320 | return -EAGAIN; | |
f9ead18c JA |
1321 | retry: |
1322 | if (!fixed) { | |
1323 | fd = __get_unused_fd_flags(accept->flags, accept->nofile); | |
1324 | if (unlikely(fd < 0)) | |
1325 | return fd; | |
1326 | } | |
1327 | file = do_accept(req->file, file_flags, accept->addr, accept->addr_len, | |
1328 | accept->flags); | |
1329 | if (IS_ERR(file)) { | |
1330 | if (!fixed) | |
1331 | put_unused_fd(fd); | |
1332 | ret = PTR_ERR(file); | |
1333 | if (ret == -EAGAIN && force_nonblock) { | |
1334 | /* | |
1335 | * if it's multishot and polled, we don't need to | |
1336 | * return EAGAIN to arm the poll infra since it | |
1337 | * has already been done | |
1338 | */ | |
91482864 | 1339 | if (issue_flags & IO_URING_F_MULTISHOT) |
f9ead18c JA |
1340 | ret = IOU_ISSUE_SKIP_COMPLETE; |
1341 | return ret; | |
1342 | } | |
1343 | if (ret == -ERESTARTSYS) | |
1344 | ret = -EINTR; | |
1345 | req_set_fail(req); | |
1346 | } else if (!fixed) { | |
1347 | fd_install(fd, file); | |
1348 | ret = fd; | |
1349 | } else { | |
1350 | ret = io_fixed_fd_install(req, issue_flags, file, | |
1351 | accept->file_slot); | |
1352 | } | |
1353 | ||
1354 | if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { | |
1355 | io_req_set_res(req, ret, 0); | |
1356 | return IOU_OK; | |
1357 | } | |
f9ead18c | 1358 | |
515e2696 DY |
1359 | if (ret < 0) |
1360 | return ret; | |
9b8c5475 DY |
1361 | if (io_aux_cqe(ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, |
1362 | req->cqe.user_data, ret, IORING_CQE_F_MORE, true)) | |
d245bca6 | 1363 | goto retry; |
cbd25748 | 1364 | |
515e2696 | 1365 | return -ECANCELED; |
f9ead18c JA |
1366 | } |
1367 | ||
1368 | int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
1369 | { | |
f2ccb5ae | 1370 | struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
f9ead18c JA |
1371 | |
1372 | if (sqe->addr || sqe->rw_flags || sqe->buf_index) | |
1373 | return -EINVAL; | |
1374 | ||
1375 | sock->domain = READ_ONCE(sqe->fd); | |
1376 | sock->type = READ_ONCE(sqe->off); | |
1377 | sock->protocol = READ_ONCE(sqe->len); | |
1378 | sock->file_slot = READ_ONCE(sqe->file_index); | |
1379 | sock->nofile = rlimit(RLIMIT_NOFILE); | |
1380 | ||
1381 | sock->flags = sock->type & ~SOCK_TYPE_MASK; | |
1382 | if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) | |
1383 | return -EINVAL; | |
1384 | if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) | |
1385 | return -EINVAL; | |
1386 | return 0; | |
1387 | } | |
1388 | ||
1389 | int io_socket(struct io_kiocb *req, unsigned int issue_flags) | |
1390 | { | |
f2ccb5ae | 1391 | struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
f9ead18c JA |
1392 | bool fixed = !!sock->file_slot; |
1393 | struct file *file; | |
1394 | int ret, fd; | |
1395 | ||
1396 | if (!fixed) { | |
1397 | fd = __get_unused_fd_flags(sock->flags, sock->nofile); | |
1398 | if (unlikely(fd < 0)) | |
1399 | return fd; | |
1400 | } | |
1401 | file = __sys_socket_file(sock->domain, sock->type, sock->protocol); | |
1402 | if (IS_ERR(file)) { | |
1403 | if (!fixed) | |
1404 | put_unused_fd(fd); | |
1405 | ret = PTR_ERR(file); | |
1406 | if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) | |
1407 | return -EAGAIN; | |
1408 | if (ret == -ERESTARTSYS) | |
1409 | ret = -EINTR; | |
1410 | req_set_fail(req); | |
1411 | } else if (!fixed) { | |
1412 | fd_install(fd, file); | |
1413 | ret = fd; | |
1414 | } else { | |
1415 | ret = io_fixed_fd_install(req, issue_flags, file, | |
1416 | sock->file_slot); | |
1417 | } | |
1418 | io_req_set_res(req, ret, 0); | |
1419 | return IOU_OK; | |
1420 | } | |
1421 | ||
1422 | int io_connect_prep_async(struct io_kiocb *req) | |
1423 | { | |
1424 | struct io_async_connect *io = req->async_data; | |
f2ccb5ae | 1425 | struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1426 | |
1427 | return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); | |
1428 | } | |
1429 | ||
1430 | int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
1431 | { | |
f2ccb5ae | 1432 | struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1433 | |
1434 | if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in) | |
1435 | return -EINVAL; | |
1436 | ||
1437 | conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr)); | |
1438 | conn->addr_len = READ_ONCE(sqe->addr2); | |
74e2e17e | 1439 | conn->in_progress = conn->seen_econnaborted = false; |
f9ead18c JA |
1440 | return 0; |
1441 | } | |
1442 | ||
1443 | int io_connect(struct io_kiocb *req, unsigned int issue_flags) | |
1444 | { | |
f2ccb5ae | 1445 | struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect); |
f9ead18c JA |
1446 | struct io_async_connect __io, *io; |
1447 | unsigned file_flags; | |
1448 | int ret; | |
1449 | bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; | |
1450 | ||
3fb1bd68 JA |
1451 | if (connect->in_progress) { |
1452 | struct socket *socket; | |
1453 | ||
1454 | ret = -ENOTSOCK; | |
1455 | socket = sock_from_file(req->file); | |
1456 | if (socket) | |
1457 | ret = sock_error(socket->sk); | |
1458 | goto out; | |
1459 | } | |
1460 | ||
f9ead18c JA |
1461 | if (req_has_async_data(req)) { |
1462 | io = req->async_data; | |
1463 | } else { | |
1464 | ret = move_addr_to_kernel(connect->addr, | |
1465 | connect->addr_len, | |
1466 | &__io.address); | |
1467 | if (ret) | |
1468 | goto out; | |
1469 | io = &__io; | |
1470 | } | |
1471 | ||
1472 | file_flags = force_nonblock ? O_NONBLOCK : 0; | |
1473 | ||
1474 | ret = __sys_connect_file(req->file, &io->address, | |
1475 | connect->addr_len, file_flags); | |
74e2e17e JA |
1476 | if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED) |
1477 | && force_nonblock) { | |
3fb1bd68 JA |
1478 | if (ret == -EINPROGRESS) { |
1479 | connect->in_progress = true; | |
74e2e17e JA |
1480 | return -EAGAIN; |
1481 | } | |
1482 | if (ret == -ECONNABORTED) { | |
1483 | if (connect->seen_econnaborted) | |
3fb1bd68 | 1484 | goto out; |
74e2e17e JA |
1485 | connect->seen_econnaborted = true; |
1486 | } | |
1487 | if (req_has_async_data(req)) | |
1488 | return -EAGAIN; | |
1489 | if (io_alloc_async_data(req)) { | |
1490 | ret = -ENOMEM; | |
1491 | goto out; | |
f9ead18c | 1492 | } |
74e2e17e | 1493 | memcpy(req->async_data, &__io, sizeof(__io)); |
f9ead18c JA |
1494 | return -EAGAIN; |
1495 | } | |
1496 | if (ret == -ERESTARTSYS) | |
1497 | ret = -EINTR; | |
1498 | out: | |
1499 | if (ret < 0) | |
1500 | req_set_fail(req); | |
1501 | io_req_set_res(req, ret, 0); | |
1502 | return IOU_OK; | |
1503 | } | |
43e0bbbd JA |
1504 | |
1505 | void io_netmsg_cache_free(struct io_cache_entry *entry) | |
1506 | { | |
1507 | kfree(container_of(entry, struct io_async_msghdr, cache)); | |
1508 | } | |
f9ead18c | 1509 | #endif |