[linux-2.6-block.git] / io_uring / uring_cmd.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/io_uring/cmd.h>
#include <linux/io_uring/net.h>
#include <linux/security.h>
#include <linux/nospec.h>
#include <net/sock.h>

#include <uapi/linux/io_uring.h>
#include <asm/ioctls.h>

#include "io_uring.h"
#include "alloc_cache.h"
#include "rsrc.h"
#include "uring_cmd.h"

static struct uring_cache *io_uring_async_get(struct io_kiocb *req)
{
	struct io_ring_ctx *ctx = req->ctx;
	struct uring_cache *cache;

	cache = io_alloc_cache_get(&ctx->uring_cache);
	if (cache) {
		req->flags |= REQ_F_ASYNC_DATA;
		req->async_data = cache;
		return cache;
	}
	if (!io_alloc_async_data(req))
		return req->async_data;
	return NULL;
}

static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	struct uring_cache *cache = req->async_data;

	if (issue_flags & IO_URING_F_UNLOCKED)
		return;
	if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) {
		ioucmd->sqe = NULL;
		req->async_data = NULL;
		req->flags &= ~REQ_F_ASYNC_DATA;
	}
}

bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
				   struct task_struct *task, bool cancel_all)
{
	struct hlist_node *tmp;
	struct io_kiocb *req;
	bool ret = false;

	lockdep_assert_held(&ctx->uring_lock);

	hlist_for_each_entry_safe(req, tmp, &ctx->cancelable_uring_cmd,
			hash_node) {
		struct io_uring_cmd *cmd = io_kiocb_to_cmd(req,
				struct io_uring_cmd);
		struct file *file = req->file;

		if (!cancel_all && req->task != task)
			continue;

		if (cmd->flags & IORING_URING_CMD_CANCELABLE) {
			/* ->sqe isn't available if no async data */
			if (!req_has_async_data(req))
				cmd->sqe = NULL;
			file->f_op->uring_cmd(cmd, IO_URING_F_CANCEL |
						   IO_URING_F_COMPLETE_DEFER);
			ret = true;
		}
	}
	io_submit_flush_completions(ctx);
	return ret;
}

static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd,
		unsigned int issue_flags)
{
	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
	struct io_ring_ctx *ctx = req->ctx;

	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE))
		return;

	cmd->flags &= ~IORING_URING_CMD_CANCELABLE;
	io_ring_submit_lock(ctx, issue_flags);
	hlist_del(&req->hash_node);
	io_ring_submit_unlock(ctx, issue_flags);
}

/*
 * Mark this command as concelable, then io_uring_try_cancel_uring_cmd()
 * will try to cancel this issued command by sending ->uring_cmd() with
 * issue_flags of IO_URING_F_CANCEL.
 *
 * The command is guaranteed to not be done when calling ->uring_cmd()
 * with IO_URING_F_CANCEL, but it is driver's responsibility to deal
 * with race between io_uring canceling and normal completion.
 */
void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
		unsigned int issue_flags)
{
	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
	struct io_ring_ctx *ctx = req->ctx;

	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
		cmd->flags |= IORING_URING_CMD_CANCELABLE;
		io_ring_submit_lock(ctx, issue_flags);
		hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd);
		io_ring_submit_unlock(ctx, issue_flags);
	}
}
EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);

static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);

	/* task_work executor checks the deffered list completion */
	ioucmd->task_work_cb(ioucmd, IO_URING_F_COMPLETE_DEFER);
}

void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
			void (*task_work_cb)(struct io_uring_cmd *, unsigned),
			unsigned flags)
{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

	ioucmd->task_work_cb = task_work_cb;
	req->io_task_work.func = io_uring_cmd_work;
	__io_req_task_work_add(req, flags);
}
EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);

static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
					  u64 extra1, u64 extra2)
{
	req->big_cqe.extra1 = extra1;
	req->big_cqe.extra2 = extra2;
}

/*
 * Called by consumers of io_uring_cmd, if they originally returned
 * -EIOCBQUEUED upon receiving the command.
 */
void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
		       unsigned issue_flags)
{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

	io_uring_cmd_del_cancelable(ioucmd, issue_flags);

	if (ret < 0)
		req_set_fail(req);

	io_req_set_res(req, ret, 0);
	if (req->ctx->flags & IORING_SETUP_CQE32)
		io_req_set_cqe32_extra(req, res2, 0);
	io_req_uring_cleanup(req, issue_flags);
	if (req->ctx->flags & IORING_SETUP_IOPOLL) {
		/* order with io_iopoll_req_issued() checking ->iopoll_complete */
		smp_store_release(&req->iopoll_completed, 1);
	} else if (issue_flags & IO_URING_F_COMPLETE_DEFER) {
		if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED))
			return;
		io_req_complete_defer(req);
	} else {
		req->io_task_work.func = io_req_task_complete;
		io_req_task_work_add(req);
	}
}
EXPORT_SYMBOL_GPL(io_uring_cmd_done);

static int io_uring_cmd_prep_setup(struct io_kiocb *req,
				   const struct io_uring_sqe *sqe)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	struct uring_cache *cache;

	cache = io_uring_async_get(req);
	if (unlikely(!cache))
		return -ENOMEM;

	if (!(req->flags & REQ_F_FORCE_ASYNC)) {
		/* defer memcpy until we need it */
		ioucmd->sqe = sqe;
		return 0;
	}

	memcpy(req->async_data, sqe, uring_sqe_size(req->ctx));
	ioucmd->sqe = req->async_data;
	return 0;
}

int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);

	if (sqe->__pad1)
		return -EINVAL;

	ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
	if (ioucmd->flags & ~IORING_URING_CMD_MASK)
		return -EINVAL;

	if (ioucmd->flags & IORING_URING_CMD_FIXED) {
		struct io_ring_ctx *ctx = req->ctx;
		u16 index;

		req->buf_index = READ_ONCE(sqe->buf_index);
		if (unlikely(req->buf_index >= ctx->nr_user_bufs))
			return -EFAULT;
		index = array_index_nospec(req->buf_index, ctx->nr_user_bufs);
		req->imu = ctx->user_bufs[index];
		io_req_set_rsrc_node(req, ctx, 0);
	}
	ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);

	return io_uring_cmd_prep_setup(req, sqe);
}

int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
{
	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	struct io_ring_ctx *ctx = req->ctx;
	struct file *file = req->file;
	int ret;

	if (!file->f_op->uring_cmd)
		return -EOPNOTSUPP;

	ret = security_uring_cmd(ioucmd);
	if (ret)
		return ret;

	if (ctx->flags & IORING_SETUP_SQE128)
		issue_flags |= IO_URING_F_SQE128;
	if (ctx->flags & IORING_SETUP_CQE32)
		issue_flags |= IO_URING_F_CQE32;
	if (ctx->compat)
		issue_flags |= IO_URING_F_COMPAT;
	if (ctx->flags & IORING_SETUP_IOPOLL) {
		if (!file->f_op->uring_cmd_iopoll)
			return -EOPNOTSUPP;
		issue_flags |= IO_URING_F_IOPOLL;
		req->iopoll_completed = 0;
	}

	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
	if (ret == -EAGAIN) {
		struct uring_cache *cache = req->async_data;

		if (ioucmd->sqe != (void *) cache)
			memcpy(cache, ioucmd->sqe, uring_sqe_size(req->ctx));
		return -EAGAIN;
	} else if (ret == -EIOCBQUEUED) {
		return -EIOCBQUEUED;
	}

	if (ret < 0)
		req_set_fail(req);
	io_req_uring_cleanup(req, issue_flags);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
}

int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
			      struct iov_iter *iter, void *ioucmd)
{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

	return io_import_fixed(rw, iter, req->imu, ubuf, len);
}
EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);

void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
{
	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);

	io_req_queue_iowq(req);
}

static inline int io_uring_cmd_getsockopt(struct socket *sock,
					  struct io_uring_cmd *cmd,
					  unsigned int issue_flags)
{
	bool compat = !!(issue_flags & IO_URING_F_COMPAT);
	int optlen, optname, level, err;
	void __user *optval;

	level = READ_ONCE(cmd->sqe->level);
	if (level != SOL_SOCKET)
		return -EOPNOTSUPP;

	optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
	optname = READ_ONCE(cmd->sqe->optname);
	optlen = READ_ONCE(cmd->sqe->optlen);

	err = do_sock_getsockopt(sock, compat, level, optname,
				 USER_SOCKPTR(optval),
				 KERNEL_SOCKPTR(&optlen));
	if (err)
		return err;

	/* On success, return optlen */
	return optlen;
}

static inline int io_uring_cmd_setsockopt(struct socket *sock,
					  struct io_uring_cmd *cmd,
					  unsigned int issue_flags)
{
	bool compat = !!(issue_flags & IO_URING_F_COMPAT);
	int optname, optlen, level;
	void __user *optval;
	sockptr_t optval_s;

	optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
	optname = READ_ONCE(cmd->sqe->optname);
	optlen = READ_ONCE(cmd->sqe->optlen);
	level = READ_ONCE(cmd->sqe->level);
	optval_s = USER_SOCKPTR(optval);

	return do_sock_setsockopt(sock, compat, level, optname, optval_s,
				  optlen);
}

#if defined(CONFIG_NET)
int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
{
	struct socket *sock = cmd->file->private_data;
	struct sock *sk = sock->sk;
	struct proto *prot = READ_ONCE(sk->sk_prot);
	int ret, arg = 0;

	if (!prot || !prot->ioctl)
		return -EOPNOTSUPP;

	switch (cmd->sqe->cmd_op) {
	case SOCKET_URING_OP_SIOCINQ:
		ret = prot->ioctl(sk, SIOCINQ, &arg);
		if (ret)
			return ret;
		return arg;
	case SOCKET_URING_OP_SIOCOUTQ:
		ret = prot->ioctl(sk, SIOCOUTQ, &arg);
		if (ret)
			return ret;
		return arg;
	case SOCKET_URING_OP_GETSOCKOPT:
		return io_uring_cmd_getsockopt(sock, cmd, issue_flags);
	case SOCKET_URING_OP_SETSOCKOPT:
		return io_uring_cmd_setsockopt(sock, cmd, issue_flags);
	default:
		return -EOPNOTSUPP;
	}
}
EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
#endif
Commit	Line	Data
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>
8c9a6f54	6	#include <linux/io_uring/net.h>
2a584012	7	#include <linux/security.h>
9cda70f6	8	#include <linux/nospec.h>
3fb1764c	9	#include <net/sock.h>
99f15d8d JA	10
99f15d8d JA	11	#include <uapi/linux/io_uring.h>
1ba0e9d6	12	#include <asm/ioctls.h>
99f15d8d	13
99f15d8d	14	#include "io_uring.h"
414d0f45	15	#include "alloc_cache.h"
a9216fac	16	#include "rsrc.h"
99f15d8d JA	17	#include "uring_cmd.h"
99f15d8d JA	18
d10f19df JA	19	static struct uring_cache io_uring_async_get(struct io_kiocb req)
	20	{
	21	struct io_ring_ctx *ctx = req->ctx;
d10f19df JA	22	struct uring_cache *cache;
d10f19df JA	23
414d0f45 JA	24	cache = io_alloc_cache_get(&ctx->uring_cache);
414d0f45 JA	25	if (cache) {
d10f19df JA	26	req->flags \|= REQ_F_ASYNC_DATA;
	27	req->async_data = cache;
	28	return cache;
	29	}
	30	if (!io_alloc_async_data(req))
	31	return req->async_data;
	32	return NULL;
	33	}
	34
	35	static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
	36	{
	37	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
	38	struct uring_cache *cache = req->async_data;
	39
	40	if (issue_flags & IO_URING_F_UNLOCKED)
	41	return;
414d0f45	42	if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) {
d10f19df JA	43	ioucmd->sqe = NULL;
	44	req->async_data = NULL;
	45	req->flags &= ~REQ_F_ASYNC_DATA;
	46	}
	47	}
	48
da12d9ab PB	49	bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
	50	struct task_struct *task, bool cancel_all)
	51	{
	52	struct hlist_node *tmp;
	53	struct io_kiocb *req;
	54	bool ret = false;
	55
	56	lockdep_assert_held(&ctx->uring_lock);
	57
	58	hlist_for_each_entry_safe(req, tmp, &ctx->cancelable_uring_cmd,
	59	hash_node) {
	60	struct io_uring_cmd *cmd = io_kiocb_to_cmd(req,
	61	struct io_uring_cmd);
	62	struct file *file = req->file;
	63
	64	if (!cancel_all && req->task != task)
	65	continue;
	66
	67	if (cmd->flags & IORING_URING_CMD_CANCELABLE) {
	68	/* ->sqe isn't available if no async data */
	69	if (!req_has_async_data(req))
	70	cmd->sqe = NULL;
e1eef2e5 PB	71	file->f_op->uring_cmd(cmd, IO_URING_F_CANCEL \|
e1eef2e5 PB	72	IO_URING_F_COMPLETE_DEFER);
da12d9ab PB	73	ret = true;
	74	}
	75	}
	76	io_submit_flush_completions(ctx);
	77	return ret;
	78	}
	79
93b8cc60 ML	80	static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd,
	81	unsigned int issue_flags)
	82	{
	83	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
	84	struct io_ring_ctx *ctx = req->ctx;
	85
	86	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE))
	87	return;
	88
	89	cmd->flags &= ~IORING_URING_CMD_CANCELABLE;
	90	io_ring_submit_lock(ctx, issue_flags);
	91	hlist_del(&req->hash_node);
	92	io_ring_submit_unlock(ctx, issue_flags);
	93	}
	94
	95	/*
	96	* Mark this command as concelable, then io_uring_try_cancel_uring_cmd()
	97	* will try to cancel this issued command by sending ->uring_cmd() with
	98	* issue_flags of IO_URING_F_CANCEL.
	99	*
	100	* The command is guaranteed to not be done when calling ->uring_cmd()
	101	* with IO_URING_F_CANCEL, but it is driver's responsibility to deal
	102	* with race between io_uring canceling and normal completion.
	103	*/
	104	void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
	105	unsigned int issue_flags)
	106	{
	107	struct io_kiocb *req = cmd_to_io_kiocb(cmd);
	108	struct io_ring_ctx *ctx = req->ctx;
	109
	110	if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
	111	cmd->flags \|= IORING_URING_CMD_CANCELABLE;
	112	io_ring_submit_lock(ctx, issue_flags);
	113	hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd);
	114	io_ring_submit_unlock(ctx, issue_flags);
	115	}
	116	}
	117	EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);
	118
a282967c	119	static void io_uring_cmd_work(struct io_kiocb req, struct io_tw_state ts)
99f15d8d	120	{
f2ccb5ae	121	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
e1eef2e5	122
8e5b3b89 PB	123	/* task_work executor checks the deffered list completion */
8e5b3b89 PB	124	ioucmd->task_work_cb(ioucmd, IO_URING_F_COMPLETE_DEFER);
99f15d8d JA	125	}
99f15d8d JA	126
5f3139fc PB	127	void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
	128	void (task_work_cb)(struct io_uring_cmd , unsigned),
	129	unsigned flags)
99f15d8d JA	130	{
	131	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	132
	133	ioucmd->task_work_cb = task_work_cb;
	134	req->io_task_work.func = io_uring_cmd_work;
5f3139fc PB	135	__io_req_task_work_add(req, flags);
	136	}
	137	EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);
	138
99f15d8d JA	139	static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
	140	u64 extra1, u64 extra2)
	141	{
b24c5d75 PB	142	req->big_cqe.extra1 = extra1;
b24c5d75 PB	143	req->big_cqe.extra2 = extra2;
99f15d8d JA	144	}
	145
	146	/*
	147	* Called by consumers of io_uring_cmd, if they originally returned
	148	* -EIOCBQUEUED upon receiving the command.
	149	*/
9d2789ac JA	150	void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
9d2789ac JA	151	unsigned issue_flags)
99f15d8d JA	152	{
	153	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	154
93b8cc60 ML	155	io_uring_cmd_del_cancelable(ioucmd, issue_flags);
93b8cc60 ML	156
99f15d8d JA	157	if (ret < 0)
	158	req_set_fail(req);
	159
ff2557b7	160	io_req_set_res(req, ret, 0);
99f15d8d JA	161	if (req->ctx->flags & IORING_SETUP_CQE32)
99f15d8d JA	162	io_req_set_cqe32_extra(req, res2, 0);
d10f19df	163	io_req_uring_cleanup(req, issue_flags);
27a67079	164	if (req->ctx->flags & IORING_SETUP_IOPOLL) {
5756a3a7 KJ	165	/* order with io_iopoll_req_issued() checking ->iopoll_complete */
5756a3a7 KJ	166	smp_store_release(&req->iopoll_completed, 1);
e1eef2e5 PB	167	} else if (issue_flags & IO_URING_F_COMPLETE_DEFER) {
	168	if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED))
	169	return;
6edd953b	170	io_req_complete_defer(req);
27a67079	171	} else {
6edd953b PB	172	req->io_task_work.func = io_req_task_complete;
6edd953b PB	173	io_req_task_work_add(req);
27a67079	174	}
99f15d8d JA	175	}
	176	EXPORT_SYMBOL_GPL(io_uring_cmd_done);
	177
d10f19df JA	178	static int io_uring_cmd_prep_setup(struct io_kiocb *req,
d10f19df JA	179	const struct io_uring_sqe *sqe)
99f15d8d	180	{
f2ccb5ae	181	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
d10f19df	182	struct uring_cache *cache;
99f15d8d	183
d10f19df	184	cache = io_uring_async_get(req);
5eff57fa JA	185	if (unlikely(!cache))
	186	return -ENOMEM;
	187
	188	if (!(req->flags & REQ_F_FORCE_ASYNC)) {
	189	/* defer memcpy until we need it */
	190	ioucmd->sqe = sqe;
d10f19df JA	191	return 0;
d10f19df JA	192	}
5eff57fa JA	193
	194	memcpy(req->async_data, sqe, uring_sqe_size(req->ctx));
	195	ioucmd->sqe = req->async_data;
	196	return 0;
99f15d8d JA	197	}
	198
	199	int io_uring_cmd_prep(struct io_kiocb req, const struct io_uring_sqe sqe)
	200	{
f2ccb5ae	201	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d	202
9cda70f6	203	if (sqe->__pad1)
99f15d8d	204	return -EINVAL;
9cda70f6 AG	205
9cda70f6 AG	206	ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
528ce678	207	if (ioucmd->flags & ~IORING_URING_CMD_MASK)
9cda70f6 AG	208	return -EINVAL;
	209
	210	if (ioucmd->flags & IORING_URING_CMD_FIXED) {
	211	struct io_ring_ctx *ctx = req->ctx;
	212	u16 index;
	213
	214	req->buf_index = READ_ONCE(sqe->buf_index);
	215	if (unlikely(req->buf_index >= ctx->nr_user_bufs))
	216	return -EFAULT;
	217	index = array_index_nospec(req->buf_index, ctx->nr_user_bufs);
	218	req->imu = ctx->user_bufs[index];
	219	io_req_set_rsrc_node(req, ctx, 0);
	220	}
99f15d8d	221	ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
d10f19df JA	222
d10f19df JA	223	return io_uring_cmd_prep_setup(req, sqe);
99f15d8d JA	224	}
	225
	226	int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
	227	{
f2ccb5ae	228	struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
99f15d8d JA	229	struct io_ring_ctx *ctx = req->ctx;
	230	struct file *file = req->file;
	231	int ret;
	232
03b3d6be	233	if (!file->f_op->uring_cmd)
99f15d8d JA	234	return -EOPNOTSUPP;
99f15d8d JA	235
2a584012 LC	236	ret = security_uring_cmd(ioucmd);
	237	if (ret)
	238	return ret;
	239
99f15d8d JA	240	if (ctx->flags & IORING_SETUP_SQE128)
	241	issue_flags \|= IO_URING_F_SQE128;
	242	if (ctx->flags & IORING_SETUP_CQE32)
	243	issue_flags \|= IO_URING_F_CQE32;
5fea44a6 BL	244	if (ctx->compat)
5fea44a6 BL	245	issue_flags \|= IO_URING_F_COMPAT;
5756a3a7	246	if (ctx->flags & IORING_SETUP_IOPOLL) {
03b3d6be JA	247	if (!file->f_op->uring_cmd_iopoll)
03b3d6be JA	248	return -EOPNOTSUPP;
99f15d8d	249	issue_flags \|= IO_URING_F_IOPOLL;
5756a3a7	250	req->iopoll_completed = 0;
5756a3a7	251	}
99f15d8d	252
99f15d8d	253	ret = file->f_op->uring_cmd(ioucmd, issue_flags);
5eff57fa JA	254	if (ret == -EAGAIN) {
	255	struct uring_cache *cache = req->async_data;
	256
	257	if (ioucmd->sqe != (void *) cache)
	258	memcpy(cache, ioucmd->sqe, uring_sqe_size(req->ctx));
	259	return -EAGAIN;
	260	} else if (ret == -EIOCBQUEUED) {
	261	return -EIOCBQUEUED;
	262	}
99f15d8d	263
d10f19df JA	264	if (ret < 0)
	265	req_set_fail(req);
	266	io_req_uring_cleanup(req, issue_flags);
	267	io_req_set_res(req, ret, 0);
f1dcdfca	268	return IOU_OK;
99f15d8d	269	}
a9216fac AG	270
	271	int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
	272	struct iov_iter iter, void ioucmd)
	273	{
	274	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	275
	276	return io_import_fixed(rw, iter, req->imu, ubuf, len);
	277	}
	278	EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
8e9fad0e	279
6746ee4c PB	280	void io_uring_cmd_issue_blocking(struct io_uring_cmd *ioucmd)
	281	{
	282	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
	283
	284	io_req_queue_iowq(req);
	285	}
	286
a5d2f99a BL	287	static inline int io_uring_cmd_getsockopt(struct socket *sock,
	288	struct io_uring_cmd *cmd,
	289	unsigned int issue_flags)
	290	{
	291	bool compat = !!(issue_flags & IO_URING_F_COMPAT);
	292	int optlen, optname, level, err;
	293	void __user *optval;
	294
	295	level = READ_ONCE(cmd->sqe->level);
	296	if (level != SOL_SOCKET)
	297	return -EOPNOTSUPP;
	298
	299	optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
	300	optname = READ_ONCE(cmd->sqe->optname);
	301	optlen = READ_ONCE(cmd->sqe->optlen);
	302
	303	err = do_sock_getsockopt(sock, compat, level, optname,
	304	USER_SOCKPTR(optval),
	305	KERNEL_SOCKPTR(&optlen));
	306	if (err)
	307	return err;
	308
	309	/* On success, return optlen */
	310	return optlen;
	311	}
	312
4232c6e3 BL	313	static inline int io_uring_cmd_setsockopt(struct socket *sock,
	314	struct io_uring_cmd *cmd,
	315	unsigned int issue_flags)
	316	{
	317	bool compat = !!(issue_flags & IO_URING_F_COMPAT);
	318	int optname, optlen, level;
	319	void __user *optval;
	320	sockptr_t optval_s;
	321
	322	optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
	323	optname = READ_ONCE(cmd->sqe->optname);
	324	optlen = READ_ONCE(cmd->sqe->optlen);
	325	level = READ_ONCE(cmd->sqe->level);
	326	optval_s = USER_SOCKPTR(optval);
	327
	328	return do_sock_setsockopt(sock, compat, level, optname, optval_s,
	329	optlen);
	330	}
	331
d2cac3ec	332	#if defined(CONFIG_NET)
8e9fad0e BL	333	int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
	334	{
	335	struct socket *sock = cmd->file->private_data;
	336	struct sock *sk = sock->sk;
	337	struct proto *prot = READ_ONCE(sk->sk_prot);
	338	int ret, arg = 0;
	339
	340	if (!prot \|\| !prot->ioctl)
	341	return -EOPNOTSUPP;
	342
	343	switch (cmd->sqe->cmd_op) {
	344	case SOCKET_URING_OP_SIOCINQ:
	345	ret = prot->ioctl(sk, SIOCINQ, &arg);
	346	if (ret)
	347	return ret;
	348	return arg;
	349	case SOCKET_URING_OP_SIOCOUTQ:
	350	ret = prot->ioctl(sk, SIOCOUTQ, &arg);
	351	if (ret)
	352	return ret;
	353	return arg;
a5d2f99a BL	354	case SOCKET_URING_OP_GETSOCKOPT:
a5d2f99a BL	355	return io_uring_cmd_getsockopt(sock, cmd, issue_flags);
4232c6e3 BL	356	case SOCKET_URING_OP_SETSOCKOPT:
4232c6e3 BL	357	return io_uring_cmd_setsockopt(sock, cmd, issue_flags);
8e9fad0e BL	358	default:
	359	return -EOPNOTSUPP;
	360	}
	361	}
	362	EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
d2cac3ec	363	#endif