// 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 io_uring_cmd_data *io_uring_async_get(struct io_kiocb *req){	struct io_ring_ctx *ctx = req->ctx;	struct io_uring_cmd_data *cache; 	cache = io_alloc_cache_get(&ctx->uring_cache);	if (cache) {		cache->op_data = NULL;		req->flags |= REQ_F_ASYNC_DATA;		req->async_data = cache;		return cache;	}	if (!io_alloc_async_data(req)) {		cache = req->async_data;		cache->op_data = NULL;		return cache;	}	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 io_uring_cmd_data *cache = req->async_data; 	if (cache->op_data) {		kfree(cache->op_data);		cache->op_data = NULL;	} 	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 io_uring_task *tctx, 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->tctx != tctx)			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);	unsigned int flags = IO_URING_F_COMPLETE_DEFER; 	if (current->flags & (PF_EXITING | PF_KTHREAD))		flags |= IO_URING_F_TASK_DEAD; 	/* task_work executor checks the deffered list completion */	ioucmd->task_work_cb(ioucmd, flags);} 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, u64 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 io_uring_cmd_data *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;		struct io_rsrc_node *node;		u16 index = READ_ONCE(sqe->buf_index); 		node = io_rsrc_node_lookup(&ctx->buf_table, index);		if (unlikely(!node))			return -EFAULT;		/*		 * Pi node upfront, prior to io_uring_cmd_import_fixed()		 * being called. This prevents destruction of the mapped buffer		 * we'll need at actual import time.		 */		io_req_assign_buf_node(req, node);	}	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 io_uring_cmd_data *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);	struct io_rsrc_node *node = req->buf_node; 	/* Must have had rsrc_node assigned at prep time */	if (node)		return io_import_fixed(rw, iter, node->buf, ubuf, len); 	return -EFAULT;}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