Loading...
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/io_uring.h>
6#include <linux/security.h>
7#include <linux/nospec.h>
8
9#include <uapi/linux/io_uring.h>
10
11#include "io_uring.h"
12#include "rsrc.h"
13#include "uring_cmd.h"
14
15static void io_uring_cmd_work(struct io_kiocb *req, bool *locked)
16{
17 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
18
19 ioucmd->task_work_cb(ioucmd);
20}
21
22void io_uring_cmd_complete_in_task(struct io_uring_cmd *ioucmd,
23 void (*task_work_cb)(struct io_uring_cmd *))
24{
25 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
26
27 ioucmd->task_work_cb = task_work_cb;
28 req->io_task_work.func = io_uring_cmd_work;
29 io_req_task_work_add(req);
30}
31EXPORT_SYMBOL_GPL(io_uring_cmd_complete_in_task);
32
33static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
34 u64 extra1, u64 extra2)
35{
36 req->extra1 = extra1;
37 req->extra2 = extra2;
38 req->flags |= REQ_F_CQE32_INIT;
39}
40
41/*
42 * Called by consumers of io_uring_cmd, if they originally returned
43 * -EIOCBQUEUED upon receiving the command.
44 */
45void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2)
46{
47 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
48
49 if (ret < 0)
50 req_set_fail(req);
51
52 io_req_set_res(req, ret, 0);
53 if (req->ctx->flags & IORING_SETUP_CQE32)
54 io_req_set_cqe32_extra(req, res2, 0);
55 if (req->ctx->flags & IORING_SETUP_IOPOLL)
56 /* order with io_iopoll_req_issued() checking ->iopoll_complete */
57 smp_store_release(&req->iopoll_completed, 1);
58 else
59 io_req_complete_post(req, 0);
60}
61EXPORT_SYMBOL_GPL(io_uring_cmd_done);
62
63int io_uring_cmd_prep_async(struct io_kiocb *req)
64{
65 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
66 size_t cmd_size;
67
68 BUILD_BUG_ON(uring_cmd_pdu_size(0) != 16);
69 BUILD_BUG_ON(uring_cmd_pdu_size(1) != 80);
70
71 cmd_size = uring_cmd_pdu_size(req->ctx->flags & IORING_SETUP_SQE128);
72
73 memcpy(req->async_data, ioucmd->cmd, cmd_size);
74 return 0;
75}
76
77int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
78{
79 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
80
81 if (sqe->__pad1)
82 return -EINVAL;
83
84 ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
85 if (ioucmd->flags & ~IORING_URING_CMD_FIXED)
86 return -EINVAL;
87
88 if (ioucmd->flags & IORING_URING_CMD_FIXED) {
89 struct io_ring_ctx *ctx = req->ctx;
90 u16 index;
91
92 req->buf_index = READ_ONCE(sqe->buf_index);
93 if (unlikely(req->buf_index >= ctx->nr_user_bufs))
94 return -EFAULT;
95 index = array_index_nospec(req->buf_index, ctx->nr_user_bufs);
96 req->imu = ctx->user_bufs[index];
97 io_req_set_rsrc_node(req, ctx, 0);
98 }
99 ioucmd->cmd = sqe->cmd;
100 ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
101 return 0;
102}
103
104int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
105{
106 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
107 struct io_ring_ctx *ctx = req->ctx;
108 struct file *file = req->file;
109 int ret;
110
111 if (!req->file->f_op->uring_cmd)
112 return -EOPNOTSUPP;
113
114 ret = security_uring_cmd(ioucmd);
115 if (ret)
116 return ret;
117
118 if (ctx->flags & IORING_SETUP_SQE128)
119 issue_flags |= IO_URING_F_SQE128;
120 if (ctx->flags & IORING_SETUP_CQE32)
121 issue_flags |= IO_URING_F_CQE32;
122 if (ctx->flags & IORING_SETUP_IOPOLL) {
123 issue_flags |= IO_URING_F_IOPOLL;
124 req->iopoll_completed = 0;
125 WRITE_ONCE(ioucmd->cookie, NULL);
126 }
127
128 if (req_has_async_data(req))
129 ioucmd->cmd = req->async_data;
130
131 ret = file->f_op->uring_cmd(ioucmd, issue_flags);
132 if (ret == -EAGAIN) {
133 if (!req_has_async_data(req)) {
134 if (io_alloc_async_data(req))
135 return -ENOMEM;
136 io_uring_cmd_prep_async(req);
137 }
138 return -EAGAIN;
139 }
140
141 if (ret != -EIOCBQUEUED) {
142 if (ret < 0)
143 req_set_fail(req);
144 io_req_set_res(req, ret, 0);
145 return ret;
146 }
147
148 return IOU_ISSUE_SKIP_COMPLETE;
149}
150
151int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
152 struct iov_iter *iter, void *ioucmd)
153{
154 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
155
156 return io_import_fixed(rw, iter, req->imu, ubuf, len);
157}
158EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
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/io_uring/cmd.h>
6#include <linux/security.h>
7#include <linux/nospec.h>
8
9#include <uapi/linux/io_uring.h>
10#include <asm/ioctls.h>
11
12#include "io_uring.h"
13#include "rsrc.h"
14#include "uring_cmd.h"
15
16static 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 */
40void 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}
53EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);
54
55static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts)
56{
57 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
58 unsigned issue_flags = ts->locked ? 0 : IO_URING_F_UNLOCKED;
59
60 ioucmd->task_work_cb(ioucmd, issue_flags);
61}
62
63void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
64 void (*task_work_cb)(struct io_uring_cmd *, unsigned),
65 unsigned flags)
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;
71 __io_req_task_work_add(req, flags);
72}
73EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);
74
75static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
76 u64 extra1, u64 extra2)
77{
78 req->big_cqe.extra1 = extra1;
79 req->big_cqe.extra2 = extra2;
80}
81
82/*
83 * Called by consumers of io_uring_cmd, if they originally returned
84 * -EIOCBQUEUED upon receiving the command.
85 */
86void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
87 unsigned issue_flags)
88{
89 struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
90
91 io_uring_cmd_del_cancelable(ioucmd, issue_flags);
92
93 if (ret < 0)
94 req_set_fail(req);
95
96 io_req_set_res(req, ret, 0);
97 if (req->ctx->flags & IORING_SETUP_CQE32)
98 io_req_set_cqe32_extra(req, res2, 0);
99 if (req->ctx->flags & IORING_SETUP_IOPOLL) {
100 /* order with io_iopoll_req_issued() checking ->iopoll_complete */
101 smp_store_release(&req->iopoll_completed, 1);
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 }
108}
109EXPORT_SYMBOL_GPL(io_uring_cmd_done);
110
111int io_uring_cmd_prep_async(struct io_kiocb *req)
112{
113 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
114
115 memcpy(req->async_data, ioucmd->sqe, uring_sqe_size(req->ctx));
116 ioucmd->sqe = req->async_data;
117 return 0;
118}
119
120int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
121{
122 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
123
124 if (sqe->__pad1)
125 return -EINVAL;
126
127 ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
128 if (ioucmd->flags & ~IORING_URING_CMD_MASK)
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 }
142 ioucmd->sqe = sqe;
143 ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
144 return 0;
145}
146
147int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
148{
149 struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
150 struct io_ring_ctx *ctx = req->ctx;
151 struct file *file = req->file;
152 int ret;
153
154 if (!file->f_op->uring_cmd)
155 return -EOPNOTSUPP;
156
157 ret = security_uring_cmd(ioucmd);
158 if (ret)
159 return ret;
160
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;
165 if (ctx->compat)
166 issue_flags |= IO_URING_F_COMPAT;
167 if (ctx->flags & IORING_SETUP_IOPOLL) {
168 if (!file->f_op->uring_cmd_iopoll)
169 return -EOPNOTSUPP;
170 issue_flags |= IO_URING_F_IOPOLL;
171 req->iopoll_completed = 0;
172 }
173
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) {
185 if (ret < 0)
186 req_set_fail(req);
187 io_req_set_res(req, ret, 0);
188 return ret;
189 }
190
191 return IOU_ISSUE_SKIP_COMPLETE;
192}
193
194int 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}
201EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
202
203static 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
229static 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
248#if defined(CONFIG_NET)
249int 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;
270 case SOCKET_URING_OP_GETSOCKOPT:
271 return io_uring_cmd_getsockopt(sock, cmd, issue_flags);
272 case SOCKET_URING_OP_SETSOCKOPT:
273 return io_uring_cmd_setsockopt(sock, cmd, issue_flags);
274 default:
275 return -EOPNOTSUPP;
276 }
277}
278EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
279#endif