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https://github.com/torvalds/linux
synced 2024-09-06 09:51:23 +00:00
![Pavel Begunkov](/assets/img/avatar_default.png)
We're exporting some io_uring bits to networking, e.g. for implementing a net callback for io_uring cmds, but we don't want to expose more than needed. Add a separate header for networking. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: David Wei <dw@davidwei.uk> Link: https://lore.kernel.org/r/20240409210554.1878789-1-dw@davidwei.uk Signed-off-by: Jens Axboe <axboe@kernel.dk>
357 lines
9.4 KiB
C
357 lines
9.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/io_uring/cmd.h>
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#include <linux/io_uring/net.h>
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#include <linux/security.h>
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#include <linux/nospec.h>
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#include <net/sock.h>
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#include <uapi/linux/io_uring.h>
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#include <asm/ioctls.h>
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#include "io_uring.h"
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#include "alloc_cache.h"
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#include "rsrc.h"
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#include "uring_cmd.h"
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static struct uring_cache *io_uring_async_get(struct io_kiocb *req)
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{
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struct io_ring_ctx *ctx = req->ctx;
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struct uring_cache *cache;
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cache = io_alloc_cache_get(&ctx->uring_cache);
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if (cache) {
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req->flags |= REQ_F_ASYNC_DATA;
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req->async_data = cache;
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return cache;
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}
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if (!io_alloc_async_data(req))
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return req->async_data;
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return NULL;
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}
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static void io_req_uring_cleanup(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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struct uring_cache *cache = req->async_data;
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if (issue_flags & IO_URING_F_UNLOCKED)
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return;
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if (io_alloc_cache_put(&req->ctx->uring_cache, cache)) {
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ioucmd->sqe = NULL;
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req->async_data = NULL;
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req->flags &= ~REQ_F_ASYNC_DATA;
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}
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}
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bool io_uring_try_cancel_uring_cmd(struct io_ring_ctx *ctx,
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struct task_struct *task, bool cancel_all)
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{
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struct hlist_node *tmp;
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struct io_kiocb *req;
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bool ret = false;
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lockdep_assert_held(&ctx->uring_lock);
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hlist_for_each_entry_safe(req, tmp, &ctx->cancelable_uring_cmd,
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hash_node) {
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struct io_uring_cmd *cmd = io_kiocb_to_cmd(req,
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struct io_uring_cmd);
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struct file *file = req->file;
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if (!cancel_all && req->task != task)
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continue;
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if (cmd->flags & IORING_URING_CMD_CANCELABLE) {
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/* ->sqe isn't available if no async data */
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if (!req_has_async_data(req))
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cmd->sqe = NULL;
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file->f_op->uring_cmd(cmd, IO_URING_F_CANCEL |
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IO_URING_F_COMPLETE_DEFER);
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ret = true;
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}
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}
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io_submit_flush_completions(ctx);
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return ret;
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}
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static void io_uring_cmd_del_cancelable(struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(cmd);
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struct io_ring_ctx *ctx = req->ctx;
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if (!(cmd->flags & IORING_URING_CMD_CANCELABLE))
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return;
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cmd->flags &= ~IORING_URING_CMD_CANCELABLE;
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io_ring_submit_lock(ctx, issue_flags);
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hlist_del(&req->hash_node);
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io_ring_submit_unlock(ctx, issue_flags);
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}
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/*
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* Mark this command as concelable, then io_uring_try_cancel_uring_cmd()
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* will try to cancel this issued command by sending ->uring_cmd() with
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* issue_flags of IO_URING_F_CANCEL.
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*
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* The command is guaranteed to not be done when calling ->uring_cmd()
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* with IO_URING_F_CANCEL, but it is driver's responsibility to deal
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* with race between io_uring canceling and normal completion.
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*/
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void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(cmd);
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struct io_ring_ctx *ctx = req->ctx;
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if (!(cmd->flags & IORING_URING_CMD_CANCELABLE)) {
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cmd->flags |= IORING_URING_CMD_CANCELABLE;
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io_ring_submit_lock(ctx, issue_flags);
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hlist_add_head(&req->hash_node, &ctx->cancelable_uring_cmd);
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io_ring_submit_unlock(ctx, issue_flags);
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}
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_mark_cancelable);
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static void io_uring_cmd_work(struct io_kiocb *req, struct io_tw_state *ts)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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/* task_work executor checks the deffered list completion */
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ioucmd->task_work_cb(ioucmd, IO_URING_F_COMPLETE_DEFER);
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}
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void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
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void (*task_work_cb)(struct io_uring_cmd *, unsigned),
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unsigned flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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ioucmd->task_work_cb = task_work_cb;
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req->io_task_work.func = io_uring_cmd_work;
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__io_req_task_work_add(req, flags);
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}
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EXPORT_SYMBOL_GPL(__io_uring_cmd_do_in_task);
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static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
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u64 extra1, u64 extra2)
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{
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req->big_cqe.extra1 = extra1;
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req->big_cqe.extra2 = extra2;
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}
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/*
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* Called by consumers of io_uring_cmd, if they originally returned
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* -EIOCBQUEUED upon receiving the command.
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*/
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void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
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unsigned issue_flags)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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io_uring_cmd_del_cancelable(ioucmd, issue_flags);
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if (ret < 0)
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req_set_fail(req);
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io_req_set_res(req, ret, 0);
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if (req->ctx->flags & IORING_SETUP_CQE32)
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io_req_set_cqe32_extra(req, res2, 0);
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io_req_uring_cleanup(req, issue_flags);
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if (req->ctx->flags & IORING_SETUP_IOPOLL) {
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/* order with io_iopoll_req_issued() checking ->iopoll_complete */
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smp_store_release(&req->iopoll_completed, 1);
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} else if (issue_flags & IO_URING_F_COMPLETE_DEFER) {
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if (WARN_ON_ONCE(issue_flags & IO_URING_F_UNLOCKED))
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return;
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io_req_complete_defer(req);
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} else {
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req->io_task_work.func = io_req_task_complete;
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io_req_task_work_add(req);
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}
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_done);
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static int io_uring_cmd_prep_setup(struct io_kiocb *req,
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const struct io_uring_sqe *sqe)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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struct uring_cache *cache;
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cache = io_uring_async_get(req);
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if (unlikely(!cache))
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return -ENOMEM;
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if (!(req->flags & REQ_F_FORCE_ASYNC)) {
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/* defer memcpy until we need it */
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ioucmd->sqe = sqe;
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return 0;
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}
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memcpy(req->async_data, sqe, uring_sqe_size(req->ctx));
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ioucmd->sqe = req->async_data;
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return 0;
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}
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int io_uring_cmd_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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if (sqe->__pad1)
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return -EINVAL;
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ioucmd->flags = READ_ONCE(sqe->uring_cmd_flags);
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if (ioucmd->flags & ~IORING_URING_CMD_MASK)
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return -EINVAL;
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if (ioucmd->flags & IORING_URING_CMD_FIXED) {
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struct io_ring_ctx *ctx = req->ctx;
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u16 index;
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req->buf_index = READ_ONCE(sqe->buf_index);
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if (unlikely(req->buf_index >= ctx->nr_user_bufs))
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return -EFAULT;
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index = array_index_nospec(req->buf_index, ctx->nr_user_bufs);
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req->imu = ctx->user_bufs[index];
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io_req_set_rsrc_node(req, ctx, 0);
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}
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ioucmd->cmd_op = READ_ONCE(sqe->cmd_op);
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return io_uring_cmd_prep_setup(req, sqe);
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}
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int io_uring_cmd(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_uring_cmd *ioucmd = io_kiocb_to_cmd(req, struct io_uring_cmd);
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struct io_ring_ctx *ctx = req->ctx;
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struct file *file = req->file;
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int ret;
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if (!file->f_op->uring_cmd)
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return -EOPNOTSUPP;
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ret = security_uring_cmd(ioucmd);
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if (ret)
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return ret;
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if (ctx->flags & IORING_SETUP_SQE128)
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issue_flags |= IO_URING_F_SQE128;
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if (ctx->flags & IORING_SETUP_CQE32)
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issue_flags |= IO_URING_F_CQE32;
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if (ctx->compat)
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issue_flags |= IO_URING_F_COMPAT;
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if (ctx->flags & IORING_SETUP_IOPOLL) {
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if (!file->f_op->uring_cmd_iopoll)
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return -EOPNOTSUPP;
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issue_flags |= IO_URING_F_IOPOLL;
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req->iopoll_completed = 0;
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}
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ret = file->f_op->uring_cmd(ioucmd, issue_flags);
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if (ret == -EAGAIN) {
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struct uring_cache *cache = req->async_data;
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if (ioucmd->sqe != (void *) cache)
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memcpy(cache, ioucmd->sqe, uring_sqe_size(req->ctx));
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return -EAGAIN;
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} else if (ret == -EIOCBQUEUED) {
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return -EIOCBQUEUED;
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}
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if (ret < 0)
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req_set_fail(req);
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io_req_uring_cleanup(req, issue_flags);
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io_req_set_res(req, ret, 0);
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return ret;
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}
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int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
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struct iov_iter *iter, void *ioucmd)
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{
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struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);
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return io_import_fixed(rw, iter, req->imu, ubuf, len);
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_import_fixed);
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static inline int io_uring_cmd_getsockopt(struct socket *sock,
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struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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bool compat = !!(issue_flags & IO_URING_F_COMPAT);
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int optlen, optname, level, err;
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void __user *optval;
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level = READ_ONCE(cmd->sqe->level);
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if (level != SOL_SOCKET)
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return -EOPNOTSUPP;
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optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
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optname = READ_ONCE(cmd->sqe->optname);
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optlen = READ_ONCE(cmd->sqe->optlen);
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err = do_sock_getsockopt(sock, compat, level, optname,
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USER_SOCKPTR(optval),
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KERNEL_SOCKPTR(&optlen));
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if (err)
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return err;
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/* On success, return optlen */
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return optlen;
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}
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static inline int io_uring_cmd_setsockopt(struct socket *sock,
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struct io_uring_cmd *cmd,
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unsigned int issue_flags)
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{
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bool compat = !!(issue_flags & IO_URING_F_COMPAT);
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int optname, optlen, level;
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void __user *optval;
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sockptr_t optval_s;
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optval = u64_to_user_ptr(READ_ONCE(cmd->sqe->optval));
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optname = READ_ONCE(cmd->sqe->optname);
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optlen = READ_ONCE(cmd->sqe->optlen);
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level = READ_ONCE(cmd->sqe->level);
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optval_s = USER_SOCKPTR(optval);
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return do_sock_setsockopt(sock, compat, level, optname, optval_s,
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optlen);
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}
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#if defined(CONFIG_NET)
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int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags)
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{
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struct socket *sock = cmd->file->private_data;
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struct sock *sk = sock->sk;
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struct proto *prot = READ_ONCE(sk->sk_prot);
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int ret, arg = 0;
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if (!prot || !prot->ioctl)
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return -EOPNOTSUPP;
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switch (cmd->sqe->cmd_op) {
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case SOCKET_URING_OP_SIOCINQ:
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ret = prot->ioctl(sk, SIOCINQ, &arg);
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if (ret)
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return ret;
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return arg;
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case SOCKET_URING_OP_SIOCOUTQ:
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ret = prot->ioctl(sk, SIOCOUTQ, &arg);
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if (ret)
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return ret;
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return arg;
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case SOCKET_URING_OP_GETSOCKOPT:
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return io_uring_cmd_getsockopt(sock, cmd, issue_flags);
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case SOCKET_URING_OP_SETSOCKOPT:
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return io_uring_cmd_setsockopt(sock, cmd, issue_flags);
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default:
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return -EOPNOTSUPP;
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}
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}
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EXPORT_SYMBOL_GPL(io_uring_cmd_sock);
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#endif
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