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99f15d8d JA |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/kernel.h> | |
3 | #include <linux/errno.h> | |
4 | #include <linux/file.h> | |
b66509b8 | 5 | #include <linux/io_uring/cmd.h> |
2a584012 | 6 | #include <linux/security.h> |
9cda70f6 | 7 | #include <linux/nospec.h> |
99f15d8d JA |
8 | |
9 | #include <uapi/linux/io_uring.h> | |
1ba0e9d6 | 10 | #include <asm/ioctls.h> |
99f15d8d | 11 | |
99f15d8d | 12 | #include "io_uring.h" |
a9216fac | 13 | #include "rsrc.h" |
99f15d8d JA |
14 | #include "uring_cmd.h" |
15 | ||
93b8cc60 ML |
16 | static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd, |
17 | unsigned int issue_flags) | |
18 | { | |
19 | struct io_kiocb *req = cmd_to_io_kiocb(cmd); | |
20 | struct io_ring_ctx *ctx = req->ctx; | |
21 | ||
22 | if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) | |
23 | return; | |
24 | ||
25 | cmd->flags &= ~IORING_URING_CMD_CANCELABLE; | |
26 | io_ring_submit_lock(ctx, issue_flags); | |
27 | hlist_del(&req->hash_node); | |
28 | io_ring_submit_unlock(ctx, issue_flags); | |
29 | } | |
30 | ||
31 | /* | |
32 | * Mark this command as concelable, then io_uring_try_cancel_uring_cmd() | |
33 | * will try to cancel this issued command by sending ->uring_cmd() with | |
34 | * issue_flags of IO_URING_F_CANCEL. | |
35 | * | |
36 | * The command is guaranteed to not be done when calling ->uring_cmd() | |
37 | * with IO_URING_F_CANCEL, but it is driver's responsibility to deal | |
38 | * with race between io_uring canceling and normal completion. | |
39 | */ | |
40 | void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, | |
41 | unsigned int issue_flags) | |
42 | { | |
43 | struct io_kiocb *req = cmd_to_io_kiocb(cmd); | |
44 | struct io_ring_ctx *ctx = req->ctx; | |
45 | ||
46 | if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) { | |
47 | cmd->flags |= IORING_URING_CMD_CANCELABLE; | |
48 | io_ring_submit_lock(ctx, issue_flags); | |
49 | hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd); | |
50 | io_ring_submit_unlock(ctx, issue_flags); | |
51 | } | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable); | |
54 | ||
a282967c | 55 | static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts) |
99f15d8d | 56 | { |
f2ccb5ae | 57 | struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); |
a282967c | 58 | unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED; |
99f15d8d | 59 | |
9d2789ac | 60 | ioucmd->task_work_cb(ioucmd, issue_flags); |
99f15d8d JA |
61 | } |
62 | ||
5f3139fc PB |
63 | void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd, |
64 | void (*task_work_cb)(struct io_uring_cmd *, unsigned), | |
65 | unsigned flags) | |
99f15d8d JA |
66 | { |
67 | struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); | |
68 | ||
69 | ioucmd->task_work_cb = task_work_cb; | |
70 | req->io_task_work.func = io_uring_cmd_work; | |
5f3139fc PB |
71 | __io_req_task_work_add(req, flags); |
72 | } | |
73 | EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task); | |
74 | ||
99f15d8d JA |
75 | static inline void io_req_set_cqe32_extra(struct io_kiocb *req, |
76 | u64 extra1, u64 extra2) | |
77 | { | |
b24c5d75 PB |
78 | req->big_cqe.extra1 = extra1; |
79 | req->big_cqe.extra2 = extra2; | |
99f15d8d JA |
80 | } |
81 | ||
82 | /* | |
83 | * Called by consumers of io_uring_cmd, if they originally returned | |
84 | * -EIOCBQUEUED upon receiving the command. | |
85 | */ | |
9d2789ac JA |
86 | void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2, |
87 | unsigned issue_flags) | |
99f15d8d JA |
88 | { |
89 | struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); | |
90 | ||
93b8cc60 ML |
91 | io_uring_cmd_del_cancelable(ioucmd, issue_flags); |
92 | ||
99f15d8d JA |
93 | if (ret < 0) |
94 | req_set_fail(req); | |
95 | ||
ff2557b7 | 96 | io_req_set_res(req, ret, 0); |
99f15d8d JA |
97 | if (req->ctx->flags & IORING_SETUP_CQE32) |
98 | io_req_set_cqe32_extra(req, res2, 0); | |
27a67079 | 99 | if (req->ctx->flags & IORING_SETUP_IOPOLL) { |
5756a3a7 KJ |
100 | /* order with io_iopoll_req_issued() checking ->iopoll_complete */ |
101 | smp_store_release(&req->iopoll_completed, 1); | |
27a67079 JA |
102 | } else { |
103 | struct io_tw_state ts = { | |
104 | .locked = !(issue_flags & IO_URING_F_UNLOCKED), | |
105 | }; | |
106 | io_req_task_complete(req, &ts); | |
107 | } | |
99f15d8d JA |
108 | } |
109 | EXPORT_SYMBOL_GPL(io_uring_cmd_done); | |
110 | ||
111 | int io_uring_cmd_prep_async(struct io_kiocb *req) | |
112 | { | |
f2ccb5ae | 113 | struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); |
99f15d8d | 114 | |
fd9b8547 BL |
115 | memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx)); |
116 | ioucmd->sqe = req->async_data; | |
99f15d8d JA |
117 | return 0; |
118 | } | |
119 | ||
120 | int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) | |
121 | { | |
f2ccb5ae | 122 | struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); |
99f15d8d | 123 | |
9cda70f6 | 124 | if (sqe->__pad1) |
99f15d8d | 125 | return -EINVAL; |
9cda70f6 AG |
126 | |
127 | ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags); | |
528ce678 | 128 | if (ioucmd->flags & ~IORING_URING_CMD_MASK) |
9cda70f6 AG |
129 | return -EINVAL; |
130 | ||
131 | if (ioucmd->flags & IORING_URING_CMD_FIXED) { | |
132 | struct io_ring_ctx *ctx = req->ctx; | |
133 | u16 index; | |
134 | ||
135 | req->buf_index = READ_ONCE(sqe->buf_index); | |
136 | if (unlikely(req->buf_index >= ctx->nr_user_bufs)) | |
137 | return -EFAULT; | |
138 | index = array_index_nospec(req->buf_index, ctx->nr_user_bufs); | |
139 | req->imu = ctx->user_bufs[index]; | |
140 | io_req_set_rsrc_node(req, ctx, 0); | |
141 | } | |
fd9b8547 | 142 | ioucmd->sqe = sqe; |
99f15d8d JA |
143 | ioucmd->cmd_op = READ_ONCE(sqe->cmd_op); |
144 | return 0; | |
145 | } | |
146 | ||
147 | int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags) | |
148 | { | |
f2ccb5ae | 149 | struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd); |
99f15d8d JA |
150 | struct io_ring_ctx *ctx = req->ctx; |
151 | struct file *file = req->file; | |
152 | int ret; | |
153 | ||
03b3d6be | 154 | if (!file->f_op->uring_cmd) |
99f15d8d JA |
155 | return -EOPNOTSUPP; |
156 | ||
2a584012 LC |
157 | ret = security_uring_cmd(ioucmd); |
158 | if (ret) | |
159 | return ret; | |
160 | ||
99f15d8d JA |
161 | if (ctx->flags & IORING_SETUP_SQE128) |
162 | issue_flags |= IO_URING_F_SQE128; | |
163 | if (ctx->flags & IORING_SETUP_CQE32) | |
164 | issue_flags |= IO_URING_F_CQE32; | |
5fea44a6 BL |
165 | if (ctx->compat) |
166 | issue_flags |= IO_URING_F_COMPAT; | |
5756a3a7 | 167 | if (ctx->flags & IORING_SETUP_IOPOLL) { |
03b3d6be JA |
168 | if (!file->f_op->uring_cmd_iopoll) |
169 | return -EOPNOTSUPP; | |
99f15d8d | 170 | issue_flags |= IO_URING_F_IOPOLL; |
5756a3a7 | 171 | req->iopoll_completed = 0; |
5756a3a7 | 172 | } |
99f15d8d | 173 | |
99f15d8d JA |
174 | ret = file->f_op->uring_cmd(ioucmd, issue_flags); |
175 | if (ret == -EAGAIN) { | |
176 | if (!req_has_async_data(req)) { | |
177 | if (io_alloc_async_data(req)) | |
178 | return -ENOMEM; | |
179 | io_uring_cmd_prep_async(req); | |
180 | } | |
181 | return -EAGAIN; | |
182 | } | |
183 | ||
184 | if (ret != -EIOCBQUEUED) { | |
3ed159c9 AG |
185 | if (ret < 0) |
186 | req_set_fail(req); | |
187 | io_req_set_res(req, ret, 0); | |
a9c3eda7 | 188 | return ret; |
99f15d8d JA |
189 | } |
190 | ||
191 | return IOU_ISSUE_SKIP_COMPLETE; | |
192 | } | |
a9216fac AG |
193 | |
194 | int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, | |
195 | struct iov_iter *iter, void *ioucmd) | |
196 | { | |
197 | struct io_kiocb *req = cmd_to_io_kiocb(ioucmd); | |
198 | ||
199 | return io_import_fixed(rw, iter, req->imu, ubuf, len); | |
200 | } | |
201 | EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed); | |
8e9fad0e | 202 | |
a5d2f99a BL |
203 | static inline int io_uring_cmd_getsockopt(struct socket *sock, |
204 | struct io_uring_cmd *cmd, | |
205 | unsigned int issue_flags) | |
206 | { | |
207 | bool compat = !!(issue_flags & IO_URING_F_COMPAT); | |
208 | int optlen, optname, level, err; | |
209 | void __user *optval; | |
210 | ||
211 | level = READ_ONCE(cmd->sqe->level); | |
212 | if (level != SOL_SOCKET) | |
213 | return -EOPNOTSUPP; | |
214 | ||
215 | optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval)); | |
216 | optname = READ_ONCE(cmd->sqe->optname); | |
217 | optlen = READ_ONCE(cmd->sqe->optlen); | |
218 | ||
219 | err = do_sock_getsockopt(sock, compat, level, optname, | |
220 | USER_SOCKPTR(optval), | |
221 | KERNEL_SOCKPTR(&optlen)); | |
222 | if (err) | |
223 | return err; | |
224 | ||
225 | /* On success, return optlen */ | |
226 | return optlen; | |
227 | } | |
228 | ||
4232c6e3 BL |
229 | static inline int io_uring_cmd_setsockopt(struct socket *sock, |
230 | struct io_uring_cmd *cmd, | |
231 | unsigned int issue_flags) | |
232 | { | |
233 | bool compat = !!(issue_flags & IO_URING_F_COMPAT); | |
234 | int optname, optlen, level; | |
235 | void __user *optval; | |
236 | sockptr_t optval_s; | |
237 | ||
238 | optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval)); | |
239 | optname = READ_ONCE(cmd->sqe->optname); | |
240 | optlen = READ_ONCE(cmd->sqe->optlen); | |
241 | level = READ_ONCE(cmd->sqe->level); | |
242 | optval_s = USER_SOCKPTR(optval); | |
243 | ||
244 | return do_sock_setsockopt(sock, compat, level, optname, optval_s, | |
245 | optlen); | |
246 | } | |
247 | ||
d2cac3ec | 248 | #if defined(CONFIG_NET) |
8e9fad0e BL |
249 | int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags) |
250 | { | |
251 | struct socket *sock = cmd->file->private_data; | |
252 | struct sock *sk = sock->sk; | |
253 | struct proto *prot = READ_ONCE(sk->sk_prot); | |
254 | int ret, arg = 0; | |
255 | ||
256 | if (!prot || !prot->ioctl) | |
257 | return -EOPNOTSUPP; | |
258 | ||
259 | switch (cmd->sqe->cmd_op) { | |
260 | case SOCKET_URING_OP_SIOCINQ: | |
261 | ret = prot->ioctl(sk, SIOCINQ, &arg); | |
262 | if (ret) | |
263 | return ret; | |
264 | return arg; | |
265 | case SOCKET_URING_OP_SIOCOUTQ: | |
266 | ret = prot->ioctl(sk, SIOCOUTQ, &arg); | |
267 | if (ret) | |
268 | return ret; | |
269 | return arg; | |
a5d2f99a BL |
270 | case SOCKET_URING_OP_GETSOCKOPT: |
271 | return io_uring_cmd_getsockopt(sock, cmd, issue_flags); | |
4232c6e3 BL |
272 | case SOCKET_URING_OP_SETSOCKOPT: |
273 | return io_uring_cmd_setsockopt(sock, cmd, issue_flags); | |
8e9fad0e BL |
274 | default: |
275 | return -EOPNOTSUPP; | |
276 | } | |
277 | } | |
278 | EXPORT_SYMBOL_GPL(io_uring_cmd_sock); | |
d2cac3ec | 279 | #endif |