mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
![Jens Axboe](/assets/img/avatar_default.png)
If the given protocol supports passing back whether or not we had more pending accept post this one, pass back this information to userspace. This is done by setting IORING_CQE_F_SOCK_NONEMPTY in the CQE flags, just like we do for recv/recvmsg if there's more data available post a receive operation. We can also use this information to be smarter about multishot retry, as we don't need to do a pointless retry if we know for a fact that there aren't any more connections to accept. Suggested-by: Norman Maurer <norman_maurer@apple.com> Acked-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
1730 lines
43 KiB
C
1730 lines
43 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/slab.h>
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#include <linux/net.h>
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#include <linux/compat.h>
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#include <net/compat.h>
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#include <linux/io_uring.h>
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#include <uapi/linux/io_uring.h>
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#include "io_uring.h"
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#include "kbuf.h"
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#include "alloc_cache.h"
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#include "net.h"
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#include "notif.h"
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#include "rsrc.h"
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#if defined(CONFIG_NET)
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struct io_shutdown {
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struct file *file;
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int how;
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};
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struct io_accept {
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struct file *file;
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struct sockaddr __user *addr;
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int __user *addr_len;
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int flags;
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int iou_flags;
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u32 file_slot;
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unsigned long nofile;
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};
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struct io_socket {
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struct file *file;
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int domain;
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int type;
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int protocol;
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int flags;
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u32 file_slot;
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unsigned long nofile;
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};
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struct io_connect {
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struct file *file;
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struct sockaddr __user *addr;
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int addr_len;
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bool in_progress;
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bool seen_econnaborted;
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};
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struct io_sr_msg {
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struct file *file;
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union {
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struct compat_msghdr __user *umsg_compat;
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struct user_msghdr __user *umsg;
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void __user *buf;
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};
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int len;
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unsigned done_io;
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unsigned msg_flags;
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unsigned nr_multishot_loops;
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u16 flags;
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/* initialised and used only by !msg send variants */
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u16 addr_len;
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u16 buf_group;
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void __user *addr;
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void __user *msg_control;
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/* used only for send zerocopy */
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struct io_kiocb *notif;
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};
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/*
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* Number of times we'll try and do receives if there's more data. If we
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* exceed this limit, then add us to the back of the queue and retry from
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* there. This helps fairness between flooding clients.
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*/
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#define MULTISHOT_MAX_RETRY 32
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int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
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if (unlikely(sqe->off || sqe->addr || sqe->rw_flags ||
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sqe->buf_index || sqe->splice_fd_in))
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return -EINVAL;
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shutdown->how = READ_ONCE(sqe->len);
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req->flags |= REQ_F_FORCE_ASYNC;
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return 0;
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}
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int io_shutdown(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown);
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struct socket *sock;
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int ret;
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WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
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sock = sock_from_file(req->file);
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if (unlikely(!sock))
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return -ENOTSOCK;
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ret = __sys_shutdown_sock(sock, shutdown->how);
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io_req_set_res(req, ret, 0);
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return IOU_OK;
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}
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static bool io_net_retry(struct socket *sock, int flags)
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{
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if (!(flags & MSG_WAITALL))
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return false;
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return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET;
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}
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static void io_netmsg_iovec_free(struct io_async_msghdr *kmsg)
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{
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if (kmsg->free_iov) {
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kfree(kmsg->free_iov);
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kmsg->free_iov_nr = 0;
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kmsg->free_iov = NULL;
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}
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}
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static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
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{
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struct io_async_msghdr *hdr = req->async_data;
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struct iovec *iov;
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/* can't recycle, ensure we free the iovec if we have one */
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if (unlikely(issue_flags & IO_URING_F_UNLOCKED)) {
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io_netmsg_iovec_free(hdr);
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return;
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}
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/* Let normal cleanup path reap it if we fail adding to the cache */
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iov = hdr->free_iov;
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if (io_alloc_cache_put(&req->ctx->netmsg_cache, hdr)) {
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if (iov)
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kasan_mempool_poison_object(iov);
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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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static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req)
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{
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struct io_ring_ctx *ctx = req->ctx;
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struct io_async_msghdr *hdr;
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hdr = io_alloc_cache_get(&ctx->netmsg_cache);
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if (hdr) {
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if (hdr->free_iov) {
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kasan_mempool_unpoison_object(hdr->free_iov,
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hdr->free_iov_nr * sizeof(struct iovec));
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req->flags |= REQ_F_NEED_CLEANUP;
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}
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req->flags |= REQ_F_ASYNC_DATA;
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req->async_data = hdr;
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return hdr;
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}
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if (!io_alloc_async_data(req)) {
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hdr = req->async_data;
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hdr->free_iov_nr = 0;
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hdr->free_iov = NULL;
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return hdr;
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}
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return NULL;
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}
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/* assign new iovec to kmsg, if we need to */
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static int io_net_vec_assign(struct io_kiocb *req, struct io_async_msghdr *kmsg,
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struct iovec *iov)
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{
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if (iov) {
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req->flags |= REQ_F_NEED_CLEANUP;
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kmsg->free_iov_nr = kmsg->msg.msg_iter.nr_segs;
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if (kmsg->free_iov)
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kfree(kmsg->free_iov);
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kmsg->free_iov = iov;
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}
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return 0;
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}
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static inline void io_mshot_prep_retry(struct io_kiocb *req,
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struct io_async_msghdr *kmsg)
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{
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struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
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req->flags &= ~REQ_F_BL_EMPTY;
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sr->done_io = 0;
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sr->len = 0; /* get from the provided buffer */
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req->buf_index = sr->buf_group;
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}
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#ifdef CONFIG_COMPAT
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static int io_compat_msg_copy_hdr(struct io_kiocb *req,
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struct io_async_msghdr *iomsg,
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struct compat_msghdr *msg, int ddir)
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{
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struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
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struct compat_iovec __user *uiov;
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struct iovec *iov;
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int ret, nr_segs;
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if (iomsg->free_iov) {
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nr_segs = iomsg->free_iov_nr;
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iov = iomsg->free_iov;
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} else {
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iov = &iomsg->fast_iov;
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nr_segs = 1;
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}
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if (copy_from_user(msg, sr->umsg_compat, sizeof(*msg)))
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return -EFAULT;
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uiov = compat_ptr(msg->msg_iov);
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if (req->flags & REQ_F_BUFFER_SELECT) {
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compat_ssize_t clen;
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if (msg->msg_iovlen == 0) {
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sr->len = iov->iov_len = 0;
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iov->iov_base = NULL;
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} else if (msg->msg_iovlen > 1) {
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return -EINVAL;
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} else {
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if (!access_ok(uiov, sizeof(*uiov)))
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return -EFAULT;
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if (__get_user(clen, &uiov->iov_len))
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return -EFAULT;
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if (clen < 0)
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return -EINVAL;
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sr->len = clen;
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}
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return 0;
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}
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ret = __import_iovec(ddir, (struct iovec __user *)uiov, msg->msg_iovlen,
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nr_segs, &iov, &iomsg->msg.msg_iter, true);
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if (unlikely(ret < 0))
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return ret;
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return io_net_vec_assign(req, iomsg, iov);
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}
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#endif
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static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg,
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struct user_msghdr *msg, int ddir)
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{
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struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
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struct iovec *iov;
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int ret, nr_segs;
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if (iomsg->free_iov) {
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nr_segs = iomsg->free_iov_nr;
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iov = iomsg->free_iov;
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} else {
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iov = &iomsg->fast_iov;
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nr_segs = 1;
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}
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if (!user_access_begin(sr->umsg, sizeof(*sr->umsg)))
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return -EFAULT;
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ret = -EFAULT;
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unsafe_get_user(msg->msg_name, &sr->umsg->msg_name, ua_end);
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unsafe_get_user(msg->msg_namelen, &sr->umsg->msg_namelen, ua_end);
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unsafe_get_user(msg->msg_iov, &sr->umsg->msg_iov, ua_end);
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unsafe_get_user(msg->msg_iovlen, &sr->umsg->msg_iovlen, ua_end);
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unsafe_get_user(msg->msg_control, &sr->umsg->msg_control, ua_end);
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unsafe_get_user(msg->msg_controllen, &sr->umsg->msg_controllen, ua_end);
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msg->msg_flags = 0;
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if (req->flags & REQ_F_BUFFER_SELECT) {
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if (msg->msg_iovlen == 0) {
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sr->len = iov->iov_len = 0;
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iov->iov_base = NULL;
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} else if (msg->msg_iovlen > 1) {
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ret = -EINVAL;
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goto ua_end;
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} else {
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/* we only need the length for provided buffers */
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if (!access_ok(&msg->msg_iov[0].iov_len, sizeof(__kernel_size_t)))
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goto ua_end;
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unsafe_get_user(iov->iov_len, &msg->msg_iov[0].iov_len,
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ua_end);
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sr->len = iov->iov_len;
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}
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ret = 0;
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ua_end:
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user_access_end();
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return ret;
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}
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user_access_end();
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ret = __import_iovec(ddir, msg->msg_iov, msg->msg_iovlen, nr_segs,
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&iov, &iomsg->msg.msg_iter, false);
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if (unlikely(ret < 0))
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return ret;
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return io_net_vec_assign(req, iomsg, iov);
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}
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static int io_sendmsg_copy_hdr(struct io_kiocb *req,
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struct io_async_msghdr *iomsg)
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{
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struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
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struct user_msghdr msg;
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int ret;
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iomsg->msg.msg_name = &iomsg->addr;
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iomsg->msg.msg_iter.nr_segs = 0;
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#ifdef CONFIG_COMPAT
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if (unlikely(req->ctx->compat)) {
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struct compat_msghdr cmsg;
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ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_SOURCE);
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if (unlikely(ret))
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return ret;
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return __get_compat_msghdr(&iomsg->msg, &cmsg, NULL);
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}
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#endif
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ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_SOURCE);
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if (unlikely(ret))
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return ret;
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ret = __copy_msghdr(&iomsg->msg, &msg, NULL);
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/* save msg_control as sys_sendmsg() overwrites it */
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sr->msg_control = iomsg->msg.msg_control_user;
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return ret;
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}
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void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req)
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{
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struct io_async_msghdr *io = req->async_data;
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io_netmsg_iovec_free(io);
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}
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static int io_send_setup(struct io_kiocb *req)
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{
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struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
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struct io_async_msghdr *kmsg = req->async_data;
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int ret;
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kmsg->msg.msg_name = NULL;
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kmsg->msg.msg_namelen = 0;
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kmsg->msg.msg_control = NULL;
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kmsg->msg.msg_controllen = 0;
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kmsg->msg.msg_ubuf = NULL;
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if (sr->addr) {
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ret = move_addr_to_kernel(sr->addr, sr->addr_len, &kmsg->addr);
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if (unlikely(ret < 0))
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return ret;
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kmsg->msg.msg_name = &kmsg->addr;
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kmsg->msg.msg_namelen = sr->addr_len;
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}
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if (!io_do_buffer_select(req)) {
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ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len,
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&kmsg->msg.msg_iter);
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if (unlikely(ret < 0))
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return ret;
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}
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return 0;
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}
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static int io_sendmsg_prep_setup(struct io_kiocb *req, int is_msg)
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{
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struct io_async_msghdr *kmsg;
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int ret;
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kmsg = io_msg_alloc_async(req);
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if (unlikely(!kmsg))
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return -ENOMEM;
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if (!is_msg)
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return io_send_setup(req);
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ret = io_sendmsg_copy_hdr(req, kmsg);
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if (!ret)
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req->flags |= REQ_F_NEED_CLEANUP;
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return ret;
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}
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#define SENDMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_BUNDLE)
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int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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{
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struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
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sr->done_io = 0;
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if (req->opcode == IORING_OP_SEND) {
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if (READ_ONCE(sqe->__pad3[0]))
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return -EINVAL;
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sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
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sr->addr_len = READ_ONCE(sqe->addr_len);
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} else if (sqe->addr2 || sqe->file_index) {
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return -EINVAL;
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}
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sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
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sr->len = READ_ONCE(sqe->len);
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sr->flags = READ_ONCE(sqe->ioprio);
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if (sr->flags & ~SENDMSG_FLAGS)
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return -EINVAL;
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sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
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if (sr->msg_flags & MSG_DONTWAIT)
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req->flags |= REQ_F_NOWAIT;
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if (sr->flags & IORING_RECVSEND_BUNDLE) {
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if (req->opcode == IORING_OP_SENDMSG)
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return -EINVAL;
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if (!(req->flags & REQ_F_BUFFER_SELECT))
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return -EINVAL;
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sr->msg_flags |= MSG_WAITALL;
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sr->buf_group = req->buf_index;
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req->buf_list = NULL;
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}
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if (req->flags & REQ_F_BUFFER_SELECT && sr->len)
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return -EINVAL;
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#ifdef CONFIG_COMPAT
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if (req->ctx->compat)
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sr->msg_flags |= MSG_CMSG_COMPAT;
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#endif
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return io_sendmsg_prep_setup(req, req->opcode == IORING_OP_SENDMSG);
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}
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static void io_req_msg_cleanup(struct io_kiocb *req,
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unsigned int issue_flags)
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{
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req->flags &= ~REQ_F_NEED_CLEANUP;
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io_netmsg_recycle(req, issue_flags);
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}
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/*
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* For bundle completions, we need to figure out how many segments we consumed.
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* A bundle could be using a single ITER_UBUF if that's all we mapped, or it
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* could be using an ITER_IOVEC. If the latter, then if we consumed all of
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* the segments, then it's a trivial questiont o answer. If we have residual
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* data in the iter, then loop the segments to figure out how much we
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* transferred.
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*/
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static int io_bundle_nbufs(struct io_async_msghdr *kmsg, int ret)
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{
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struct iovec *iov;
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int nbufs;
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/* no data is always zero segments, and a ubuf is always 1 segment */
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if (ret <= 0)
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return 0;
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if (iter_is_ubuf(&kmsg->msg.msg_iter))
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return 1;
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iov = kmsg->free_iov;
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if (!iov)
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iov = &kmsg->fast_iov;
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/* if all data was transferred, it's basic pointer math */
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if (!iov_iter_count(&kmsg->msg.msg_iter))
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return iter_iov(&kmsg->msg.msg_iter) - iov;
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/* short transfer, count segments */
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nbufs = 0;
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do {
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int this_len = min_t(int, iov[nbufs].iov_len, ret);
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nbufs++;
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ret -= this_len;
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} while (ret);
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return nbufs;
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|
}
|
|
|
|
static inline bool io_send_finish(struct io_kiocb *req, int *ret,
|
|
struct io_async_msghdr *kmsg,
|
|
unsigned issue_flags)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
bool bundle_finished = *ret <= 0;
|
|
unsigned int cflags;
|
|
|
|
if (!(sr->flags & IORING_RECVSEND_BUNDLE)) {
|
|
cflags = io_put_kbuf(req, issue_flags);
|
|
goto finish;
|
|
}
|
|
|
|
cflags = io_put_kbufs(req, io_bundle_nbufs(kmsg, *ret), issue_flags);
|
|
|
|
if (bundle_finished || req->flags & REQ_F_BL_EMPTY)
|
|
goto finish;
|
|
|
|
/*
|
|
* Fill CQE for this receive and see if we should keep trying to
|
|
* receive from this socket.
|
|
*/
|
|
if (io_req_post_cqe(req, *ret, cflags | IORING_CQE_F_MORE)) {
|
|
io_mshot_prep_retry(req, kmsg);
|
|
return false;
|
|
}
|
|
|
|
/* Otherwise stop bundle and use the current result. */
|
|
finish:
|
|
io_req_set_res(req, *ret, cflags);
|
|
*ret = IOU_OK;
|
|
return true;
|
|
}
|
|
|
|
int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_async_msghdr *kmsg = req->async_data;
|
|
struct socket *sock;
|
|
unsigned flags;
|
|
int min_ret = 0;
|
|
int ret;
|
|
|
|
sock = sock_from_file(req->file);
|
|
if (unlikely(!sock))
|
|
return -ENOTSOCK;
|
|
|
|
if (!(req->flags & REQ_F_POLLED) &&
|
|
(sr->flags & IORING_RECVSEND_POLL_FIRST))
|
|
return -EAGAIN;
|
|
|
|
flags = sr->msg_flags;
|
|
if (issue_flags & IO_URING_F_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
if (flags & MSG_WAITALL)
|
|
min_ret = iov_iter_count(&kmsg->msg.msg_iter);
|
|
|
|
kmsg->msg.msg_control_user = sr->msg_control;
|
|
|
|
ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
|
|
|
|
if (ret < min_ret) {
|
|
if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
|
|
return -EAGAIN;
|
|
if (ret > 0 && io_net_retry(sock, flags)) {
|
|
kmsg->msg.msg_controllen = 0;
|
|
kmsg->msg.msg_control = NULL;
|
|
sr->done_io += ret;
|
|
req->flags |= REQ_F_BL_NO_RECYCLE;
|
|
return -EAGAIN;
|
|
}
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
req_set_fail(req);
|
|
}
|
|
io_req_msg_cleanup(req, issue_flags);
|
|
if (ret >= 0)
|
|
ret += sr->done_io;
|
|
else if (sr->done_io)
|
|
ret = sr->done_io;
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|
|
|
|
int io_send(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_async_msghdr *kmsg = req->async_data;
|
|
struct socket *sock;
|
|
unsigned flags;
|
|
int min_ret = 0;
|
|
int ret;
|
|
|
|
sock = sock_from_file(req->file);
|
|
if (unlikely(!sock))
|
|
return -ENOTSOCK;
|
|
|
|
if (!(req->flags & REQ_F_POLLED) &&
|
|
(sr->flags & IORING_RECVSEND_POLL_FIRST))
|
|
return -EAGAIN;
|
|
|
|
flags = sr->msg_flags;
|
|
if (issue_flags & IO_URING_F_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
|
|
retry_bundle:
|
|
if (io_do_buffer_select(req)) {
|
|
struct buf_sel_arg arg = {
|
|
.iovs = &kmsg->fast_iov,
|
|
.max_len = INT_MAX,
|
|
.nr_iovs = 1,
|
|
.mode = KBUF_MODE_EXPAND,
|
|
};
|
|
|
|
if (kmsg->free_iov) {
|
|
arg.nr_iovs = kmsg->free_iov_nr;
|
|
arg.iovs = kmsg->free_iov;
|
|
arg.mode |= KBUF_MODE_FREE;
|
|
}
|
|
|
|
if (!(sr->flags & IORING_RECVSEND_BUNDLE))
|
|
arg.nr_iovs = 1;
|
|
|
|
ret = io_buffers_select(req, &arg, issue_flags);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
|
|
sr->len = arg.out_len;
|
|
iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE, arg.iovs, ret,
|
|
arg.out_len);
|
|
if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
|
|
kmsg->free_iov_nr = ret;
|
|
kmsg->free_iov = arg.iovs;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If MSG_WAITALL is set, or this is a bundle send, then we need
|
|
* the full amount. If just bundle is set, if we do a short send
|
|
* then we complete the bundle sequence rather than continue on.
|
|
*/
|
|
if (flags & MSG_WAITALL || sr->flags & IORING_RECVSEND_BUNDLE)
|
|
min_ret = iov_iter_count(&kmsg->msg.msg_iter);
|
|
|
|
flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
|
|
kmsg->msg.msg_flags = flags;
|
|
ret = sock_sendmsg(sock, &kmsg->msg);
|
|
if (ret < min_ret) {
|
|
if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
|
|
return -EAGAIN;
|
|
|
|
if (ret > 0 && io_net_retry(sock, flags)) {
|
|
sr->len -= ret;
|
|
sr->buf += ret;
|
|
sr->done_io += ret;
|
|
req->flags |= REQ_F_BL_NO_RECYCLE;
|
|
return -EAGAIN;
|
|
}
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
req_set_fail(req);
|
|
}
|
|
if (ret >= 0)
|
|
ret += sr->done_io;
|
|
else if (sr->done_io)
|
|
ret = sr->done_io;
|
|
|
|
if (!io_send_finish(req, &ret, kmsg, issue_flags))
|
|
goto retry_bundle;
|
|
|
|
io_req_msg_cleanup(req, issue_flags);
|
|
return ret;
|
|
}
|
|
|
|
static int io_recvmsg_mshot_prep(struct io_kiocb *req,
|
|
struct io_async_msghdr *iomsg,
|
|
int namelen, size_t controllen)
|
|
{
|
|
if ((req->flags & (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) ==
|
|
(REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) {
|
|
int hdr;
|
|
|
|
if (unlikely(namelen < 0))
|
|
return -EOVERFLOW;
|
|
if (check_add_overflow(sizeof(struct io_uring_recvmsg_out),
|
|
namelen, &hdr))
|
|
return -EOVERFLOW;
|
|
if (check_add_overflow(hdr, controllen, &hdr))
|
|
return -EOVERFLOW;
|
|
|
|
iomsg->namelen = namelen;
|
|
iomsg->controllen = controllen;
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int io_recvmsg_copy_hdr(struct io_kiocb *req,
|
|
struct io_async_msghdr *iomsg)
|
|
{
|
|
struct user_msghdr msg;
|
|
int ret;
|
|
|
|
iomsg->msg.msg_name = &iomsg->addr;
|
|
iomsg->msg.msg_iter.nr_segs = 0;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
if (unlikely(req->ctx->compat)) {
|
|
struct compat_msghdr cmsg;
|
|
|
|
ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_DEST);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
ret = __get_compat_msghdr(&iomsg->msg, &cmsg, &iomsg->uaddr);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
return io_recvmsg_mshot_prep(req, iomsg, cmsg.msg_namelen,
|
|
cmsg.msg_controllen);
|
|
}
|
|
#endif
|
|
|
|
ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_DEST);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
return io_recvmsg_mshot_prep(req, iomsg, msg.msg_namelen,
|
|
msg.msg_controllen);
|
|
}
|
|
|
|
static int io_recvmsg_prep_setup(struct io_kiocb *req)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_async_msghdr *kmsg;
|
|
int ret;
|
|
|
|
kmsg = io_msg_alloc_async(req);
|
|
if (unlikely(!kmsg))
|
|
return -ENOMEM;
|
|
|
|
if (req->opcode == IORING_OP_RECV) {
|
|
kmsg->msg.msg_name = NULL;
|
|
kmsg->msg.msg_namelen = 0;
|
|
kmsg->msg.msg_control = NULL;
|
|
kmsg->msg.msg_get_inq = 1;
|
|
kmsg->msg.msg_controllen = 0;
|
|
kmsg->msg.msg_iocb = NULL;
|
|
kmsg->msg.msg_ubuf = NULL;
|
|
|
|
if (!io_do_buffer_select(req)) {
|
|
ret = import_ubuf(ITER_DEST, sr->buf, sr->len,
|
|
&kmsg->msg.msg_iter);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ret = io_recvmsg_copy_hdr(req, kmsg);
|
|
if (!ret)
|
|
req->flags |= REQ_F_NEED_CLEANUP;
|
|
return ret;
|
|
}
|
|
|
|
#define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT | \
|
|
IORING_RECVSEND_BUNDLE)
|
|
|
|
int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
|
|
sr->done_io = 0;
|
|
|
|
if (unlikely(sqe->file_index || sqe->addr2))
|
|
return -EINVAL;
|
|
|
|
sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
|
|
sr->len = READ_ONCE(sqe->len);
|
|
sr->flags = READ_ONCE(sqe->ioprio);
|
|
if (sr->flags & ~RECVMSG_FLAGS)
|
|
return -EINVAL;
|
|
sr->msg_flags = READ_ONCE(sqe->msg_flags);
|
|
if (sr->msg_flags & MSG_DONTWAIT)
|
|
req->flags |= REQ_F_NOWAIT;
|
|
if (sr->msg_flags & MSG_ERRQUEUE)
|
|
req->flags |= REQ_F_CLEAR_POLLIN;
|
|
if (req->flags & REQ_F_BUFFER_SELECT) {
|
|
/*
|
|
* Store the buffer group for this multishot receive separately,
|
|
* as if we end up doing an io-wq based issue that selects a
|
|
* buffer, it has to be committed immediately and that will
|
|
* clear ->buf_list. This means we lose the link to the buffer
|
|
* list, and the eventual buffer put on completion then cannot
|
|
* restore it.
|
|
*/
|
|
sr->buf_group = req->buf_index;
|
|
req->buf_list = NULL;
|
|
}
|
|
if (sr->flags & IORING_RECV_MULTISHOT) {
|
|
if (!(req->flags & REQ_F_BUFFER_SELECT))
|
|
return -EINVAL;
|
|
if (sr->msg_flags & MSG_WAITALL)
|
|
return -EINVAL;
|
|
if (req->opcode == IORING_OP_RECV && sr->len)
|
|
return -EINVAL;
|
|
req->flags |= REQ_F_APOLL_MULTISHOT;
|
|
}
|
|
if (sr->flags & IORING_RECVSEND_BUNDLE) {
|
|
if (req->opcode == IORING_OP_RECVMSG)
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
if (req->ctx->compat)
|
|
sr->msg_flags |= MSG_CMSG_COMPAT;
|
|
#endif
|
|
sr->nr_multishot_loops = 0;
|
|
return io_recvmsg_prep_setup(req);
|
|
}
|
|
|
|
/*
|
|
* Finishes io_recv and io_recvmsg.
|
|
*
|
|
* Returns true if it is actually finished, or false if it should run
|
|
* again (for multishot).
|
|
*/
|
|
static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
|
|
struct io_async_msghdr *kmsg,
|
|
bool mshot_finished, unsigned issue_flags)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
unsigned int cflags;
|
|
|
|
if (sr->flags & IORING_RECVSEND_BUNDLE)
|
|
cflags = io_put_kbufs(req, io_bundle_nbufs(kmsg, *ret),
|
|
issue_flags);
|
|
else
|
|
cflags = io_put_kbuf(req, issue_flags);
|
|
|
|
if (kmsg->msg.msg_inq > 0)
|
|
cflags |= IORING_CQE_F_SOCK_NONEMPTY;
|
|
|
|
/* bundle with no more immediate buffers, we're done */
|
|
if (sr->flags & IORING_RECVSEND_BUNDLE && req->flags & REQ_F_BL_EMPTY)
|
|
goto finish;
|
|
|
|
/*
|
|
* Fill CQE for this receive and see if we should keep trying to
|
|
* receive from this socket.
|
|
*/
|
|
if ((req->flags & REQ_F_APOLL_MULTISHOT) && !mshot_finished &&
|
|
io_req_post_cqe(req, *ret, cflags | IORING_CQE_F_MORE)) {
|
|
int mshot_retry_ret = IOU_ISSUE_SKIP_COMPLETE;
|
|
|
|
io_mshot_prep_retry(req, kmsg);
|
|
/* Known not-empty or unknown state, retry */
|
|
if (cflags & IORING_CQE_F_SOCK_NONEMPTY || kmsg->msg.msg_inq < 0) {
|
|
if (sr->nr_multishot_loops++ < MULTISHOT_MAX_RETRY)
|
|
return false;
|
|
/* mshot retries exceeded, force a requeue */
|
|
sr->nr_multishot_loops = 0;
|
|
mshot_retry_ret = IOU_REQUEUE;
|
|
}
|
|
if (issue_flags & IO_URING_F_MULTISHOT)
|
|
*ret = mshot_retry_ret;
|
|
else
|
|
*ret = -EAGAIN;
|
|
return true;
|
|
}
|
|
|
|
/* Finish the request / stop multishot. */
|
|
finish:
|
|
io_req_set_res(req, *ret, cflags);
|
|
|
|
if (issue_flags & IO_URING_F_MULTISHOT)
|
|
*ret = IOU_STOP_MULTISHOT;
|
|
else
|
|
*ret = IOU_OK;
|
|
io_req_msg_cleanup(req, issue_flags);
|
|
return true;
|
|
}
|
|
|
|
static int io_recvmsg_prep_multishot(struct io_async_msghdr *kmsg,
|
|
struct io_sr_msg *sr, void __user **buf,
|
|
size_t *len)
|
|
{
|
|
unsigned long ubuf = (unsigned long) *buf;
|
|
unsigned long hdr;
|
|
|
|
hdr = sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
|
|
kmsg->controllen;
|
|
if (*len < hdr)
|
|
return -EFAULT;
|
|
|
|
if (kmsg->controllen) {
|
|
unsigned long control = ubuf + hdr - kmsg->controllen;
|
|
|
|
kmsg->msg.msg_control_user = (void __user *) control;
|
|
kmsg->msg.msg_controllen = kmsg->controllen;
|
|
}
|
|
|
|
sr->buf = *buf; /* stash for later copy */
|
|
*buf = (void __user *) (ubuf + hdr);
|
|
kmsg->payloadlen = *len = *len - hdr;
|
|
return 0;
|
|
}
|
|
|
|
struct io_recvmsg_multishot_hdr {
|
|
struct io_uring_recvmsg_out msg;
|
|
struct sockaddr_storage addr;
|
|
};
|
|
|
|
static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io,
|
|
struct io_async_msghdr *kmsg,
|
|
unsigned int flags, bool *finished)
|
|
{
|
|
int err;
|
|
int copy_len;
|
|
struct io_recvmsg_multishot_hdr hdr;
|
|
|
|
if (kmsg->namelen)
|
|
kmsg->msg.msg_name = &hdr.addr;
|
|
kmsg->msg.msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
|
|
kmsg->msg.msg_namelen = 0;
|
|
|
|
if (sock->file->f_flags & O_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
|
|
err = sock_recvmsg(sock, &kmsg->msg, flags);
|
|
*finished = err <= 0;
|
|
if (err < 0)
|
|
return err;
|
|
|
|
hdr.msg = (struct io_uring_recvmsg_out) {
|
|
.controllen = kmsg->controllen - kmsg->msg.msg_controllen,
|
|
.flags = kmsg->msg.msg_flags & ~MSG_CMSG_COMPAT
|
|
};
|
|
|
|
hdr.msg.payloadlen = err;
|
|
if (err > kmsg->payloadlen)
|
|
err = kmsg->payloadlen;
|
|
|
|
copy_len = sizeof(struct io_uring_recvmsg_out);
|
|
if (kmsg->msg.msg_namelen > kmsg->namelen)
|
|
copy_len += kmsg->namelen;
|
|
else
|
|
copy_len += kmsg->msg.msg_namelen;
|
|
|
|
/*
|
|
* "fromlen shall refer to the value before truncation.."
|
|
* 1003.1g
|
|
*/
|
|
hdr.msg.namelen = kmsg->msg.msg_namelen;
|
|
|
|
/* ensure that there is no gap between hdr and sockaddr_storage */
|
|
BUILD_BUG_ON(offsetof(struct io_recvmsg_multishot_hdr, addr) !=
|
|
sizeof(struct io_uring_recvmsg_out));
|
|
if (copy_to_user(io->buf, &hdr, copy_len)) {
|
|
*finished = true;
|
|
return -EFAULT;
|
|
}
|
|
|
|
return sizeof(struct io_uring_recvmsg_out) + kmsg->namelen +
|
|
kmsg->controllen + err;
|
|
}
|
|
|
|
int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_async_msghdr *kmsg = req->async_data;
|
|
struct socket *sock;
|
|
unsigned flags;
|
|
int ret, min_ret = 0;
|
|
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
|
|
bool mshot_finished = true;
|
|
|
|
sock = sock_from_file(req->file);
|
|
if (unlikely(!sock))
|
|
return -ENOTSOCK;
|
|
|
|
if (!(req->flags & REQ_F_POLLED) &&
|
|
(sr->flags & IORING_RECVSEND_POLL_FIRST))
|
|
return -EAGAIN;
|
|
|
|
flags = sr->msg_flags;
|
|
if (force_nonblock)
|
|
flags |= MSG_DONTWAIT;
|
|
|
|
retry_multishot:
|
|
if (io_do_buffer_select(req)) {
|
|
void __user *buf;
|
|
size_t len = sr->len;
|
|
|
|
buf = io_buffer_select(req, &len, issue_flags);
|
|
if (!buf)
|
|
return -ENOBUFS;
|
|
|
|
if (req->flags & REQ_F_APOLL_MULTISHOT) {
|
|
ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len);
|
|
if (ret) {
|
|
io_kbuf_recycle(req, issue_flags);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len);
|
|
}
|
|
|
|
kmsg->msg.msg_get_inq = 1;
|
|
kmsg->msg.msg_inq = -1;
|
|
if (req->flags & REQ_F_APOLL_MULTISHOT) {
|
|
ret = io_recvmsg_multishot(sock, sr, kmsg, flags,
|
|
&mshot_finished);
|
|
} else {
|
|
/* disable partial retry for recvmsg with cmsg attached */
|
|
if (flags & MSG_WAITALL && !kmsg->msg.msg_controllen)
|
|
min_ret = iov_iter_count(&kmsg->msg.msg_iter);
|
|
|
|
ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg,
|
|
kmsg->uaddr, flags);
|
|
}
|
|
|
|
if (ret < min_ret) {
|
|
if (ret == -EAGAIN && force_nonblock) {
|
|
if (issue_flags & IO_URING_F_MULTISHOT) {
|
|
io_kbuf_recycle(req, issue_flags);
|
|
return IOU_ISSUE_SKIP_COMPLETE;
|
|
}
|
|
return -EAGAIN;
|
|
}
|
|
if (ret > 0 && io_net_retry(sock, flags)) {
|
|
sr->done_io += ret;
|
|
req->flags |= REQ_F_BL_NO_RECYCLE;
|
|
return -EAGAIN;
|
|
}
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
req_set_fail(req);
|
|
} else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
|
|
req_set_fail(req);
|
|
}
|
|
|
|
if (ret > 0)
|
|
ret += sr->done_io;
|
|
else if (sr->done_io)
|
|
ret = sr->done_io;
|
|
else
|
|
io_kbuf_recycle(req, issue_flags);
|
|
|
|
if (!io_recv_finish(req, &ret, kmsg, mshot_finished, issue_flags))
|
|
goto retry_multishot;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int io_recv_buf_select(struct io_kiocb *req, struct io_async_msghdr *kmsg,
|
|
size_t *len, unsigned int issue_flags)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
int ret;
|
|
|
|
/*
|
|
* If the ring isn't locked, then don't use the peek interface
|
|
* to grab multiple buffers as we will lock/unlock between
|
|
* this selection and posting the buffers.
|
|
*/
|
|
if (!(issue_flags & IO_URING_F_UNLOCKED) &&
|
|
sr->flags & IORING_RECVSEND_BUNDLE) {
|
|
struct buf_sel_arg arg = {
|
|
.iovs = &kmsg->fast_iov,
|
|
.nr_iovs = 1,
|
|
.mode = KBUF_MODE_EXPAND,
|
|
};
|
|
|
|
if (kmsg->free_iov) {
|
|
arg.nr_iovs = kmsg->free_iov_nr;
|
|
arg.iovs = kmsg->free_iov;
|
|
arg.mode |= KBUF_MODE_FREE;
|
|
}
|
|
|
|
if (kmsg->msg.msg_inq > 0)
|
|
arg.max_len = min_not_zero(sr->len, kmsg->msg.msg_inq);
|
|
|
|
ret = io_buffers_peek(req, &arg);
|
|
if (unlikely(ret < 0))
|
|
return ret;
|
|
|
|
/* special case 1 vec, can be a fast path */
|
|
if (ret == 1) {
|
|
sr->buf = arg.iovs[0].iov_base;
|
|
sr->len = arg.iovs[0].iov_len;
|
|
goto map_ubuf;
|
|
}
|
|
iov_iter_init(&kmsg->msg.msg_iter, ITER_DEST, arg.iovs, ret,
|
|
arg.out_len);
|
|
if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
|
|
kmsg->free_iov_nr = ret;
|
|
kmsg->free_iov = arg.iovs;
|
|
}
|
|
} else {
|
|
void __user *buf;
|
|
|
|
*len = sr->len;
|
|
buf = io_buffer_select(req, len, issue_flags);
|
|
if (!buf)
|
|
return -ENOBUFS;
|
|
sr->buf = buf;
|
|
sr->len = *len;
|
|
map_ubuf:
|
|
ret = import_ubuf(ITER_DEST, sr->buf, sr->len,
|
|
&kmsg->msg.msg_iter);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int io_recv(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_async_msghdr *kmsg = req->async_data;
|
|
struct socket *sock;
|
|
unsigned flags;
|
|
int ret, min_ret = 0;
|
|
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
|
|
size_t len = sr->len;
|
|
|
|
if (!(req->flags & REQ_F_POLLED) &&
|
|
(sr->flags & IORING_RECVSEND_POLL_FIRST))
|
|
return -EAGAIN;
|
|
|
|
sock = sock_from_file(req->file);
|
|
if (unlikely(!sock))
|
|
return -ENOTSOCK;
|
|
|
|
flags = sr->msg_flags;
|
|
if (force_nonblock)
|
|
flags |= MSG_DONTWAIT;
|
|
|
|
retry_multishot:
|
|
if (io_do_buffer_select(req)) {
|
|
ret = io_recv_buf_select(req, kmsg, &len, issue_flags);
|
|
if (unlikely(ret))
|
|
goto out_free;
|
|
sr->buf = NULL;
|
|
}
|
|
|
|
kmsg->msg.msg_inq = -1;
|
|
kmsg->msg.msg_flags = 0;
|
|
|
|
if (flags & MSG_WAITALL)
|
|
min_ret = iov_iter_count(&kmsg->msg.msg_iter);
|
|
|
|
ret = sock_recvmsg(sock, &kmsg->msg, flags);
|
|
if (ret < min_ret) {
|
|
if (ret == -EAGAIN && force_nonblock) {
|
|
if (issue_flags & IO_URING_F_MULTISHOT) {
|
|
io_kbuf_recycle(req, issue_flags);
|
|
return IOU_ISSUE_SKIP_COMPLETE;
|
|
}
|
|
|
|
return -EAGAIN;
|
|
}
|
|
if (ret > 0 && io_net_retry(sock, flags)) {
|
|
sr->len -= ret;
|
|
sr->buf += ret;
|
|
sr->done_io += ret;
|
|
req->flags |= REQ_F_BL_NO_RECYCLE;
|
|
return -EAGAIN;
|
|
}
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
req_set_fail(req);
|
|
} else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
|
|
out_free:
|
|
req_set_fail(req);
|
|
}
|
|
|
|
if (ret > 0)
|
|
ret += sr->done_io;
|
|
else if (sr->done_io)
|
|
ret = sr->done_io;
|
|
else
|
|
io_kbuf_recycle(req, issue_flags);
|
|
|
|
if (!io_recv_finish(req, &ret, kmsg, ret <= 0, issue_flags))
|
|
goto retry_multishot;
|
|
|
|
return ret;
|
|
}
|
|
|
|
void io_send_zc_cleanup(struct io_kiocb *req)
|
|
{
|
|
struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_async_msghdr *io = req->async_data;
|
|
|
|
if (req_has_async_data(req))
|
|
io_netmsg_iovec_free(io);
|
|
if (zc->notif) {
|
|
io_notif_flush(zc->notif);
|
|
zc->notif = NULL;
|
|
}
|
|
}
|
|
|
|
#define IO_ZC_FLAGS_COMMON (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_FIXED_BUF)
|
|
#define IO_ZC_FLAGS_VALID (IO_ZC_FLAGS_COMMON | IORING_SEND_ZC_REPORT_USAGE)
|
|
|
|
int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_ring_ctx *ctx = req->ctx;
|
|
struct io_kiocb *notif;
|
|
|
|
zc->done_io = 0;
|
|
req->flags |= REQ_F_POLL_NO_LAZY;
|
|
|
|
if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)))
|
|
return -EINVAL;
|
|
/* we don't support IOSQE_CQE_SKIP_SUCCESS just yet */
|
|
if (req->flags & REQ_F_CQE_SKIP)
|
|
return -EINVAL;
|
|
|
|
notif = zc->notif = io_alloc_notif(ctx);
|
|
if (!notif)
|
|
return -ENOMEM;
|
|
notif->cqe.user_data = req->cqe.user_data;
|
|
notif->cqe.res = 0;
|
|
notif->cqe.flags = IORING_CQE_F_NOTIF;
|
|
req->flags |= REQ_F_NEED_CLEANUP;
|
|
|
|
zc->flags = READ_ONCE(sqe->ioprio);
|
|
if (unlikely(zc->flags & ~IO_ZC_FLAGS_COMMON)) {
|
|
if (zc->flags & ~IO_ZC_FLAGS_VALID)
|
|
return -EINVAL;
|
|
if (zc->flags & IORING_SEND_ZC_REPORT_USAGE) {
|
|
struct io_notif_data *nd = io_notif_to_data(notif);
|
|
|
|
nd->zc_report = true;
|
|
nd->zc_used = false;
|
|
nd->zc_copied = false;
|
|
}
|
|
}
|
|
|
|
if (zc->flags & IORING_RECVSEND_FIXED_BUF) {
|
|
unsigned idx = READ_ONCE(sqe->buf_index);
|
|
|
|
if (unlikely(idx >= ctx->nr_user_bufs))
|
|
return -EFAULT;
|
|
idx = array_index_nospec(idx, ctx->nr_user_bufs);
|
|
req->imu = READ_ONCE(ctx->user_bufs[idx]);
|
|
io_req_set_rsrc_node(notif, ctx, 0);
|
|
}
|
|
|
|
if (req->opcode == IORING_OP_SEND_ZC) {
|
|
if (READ_ONCE(sqe->__pad3[0]))
|
|
return -EINVAL;
|
|
zc->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2));
|
|
zc->addr_len = READ_ONCE(sqe->addr_len);
|
|
} else {
|
|
if (unlikely(sqe->addr2 || sqe->file_index))
|
|
return -EINVAL;
|
|
if (unlikely(zc->flags & IORING_RECVSEND_FIXED_BUF))
|
|
return -EINVAL;
|
|
}
|
|
|
|
zc->buf = u64_to_user_ptr(READ_ONCE(sqe->addr));
|
|
zc->len = READ_ONCE(sqe->len);
|
|
zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL | MSG_ZEROCOPY;
|
|
if (zc->msg_flags & MSG_DONTWAIT)
|
|
req->flags |= REQ_F_NOWAIT;
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
if (req->ctx->compat)
|
|
zc->msg_flags |= MSG_CMSG_COMPAT;
|
|
#endif
|
|
return io_sendmsg_prep_setup(req, req->opcode == IORING_OP_SENDMSG_ZC);
|
|
}
|
|
|
|
static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb,
|
|
struct iov_iter *from, size_t length)
|
|
{
|
|
skb_zcopy_downgrade_managed(skb);
|
|
return __zerocopy_sg_from_iter(NULL, sk, skb, from, length);
|
|
}
|
|
|
|
static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb,
|
|
struct iov_iter *from, size_t length)
|
|
{
|
|
struct skb_shared_info *shinfo = skb_shinfo(skb);
|
|
int frag = shinfo->nr_frags;
|
|
int ret = 0;
|
|
struct bvec_iter bi;
|
|
ssize_t copied = 0;
|
|
unsigned long truesize = 0;
|
|
|
|
if (!frag)
|
|
shinfo->flags |= SKBFL_MANAGED_FRAG_REFS;
|
|
else if (unlikely(!skb_zcopy_managed(skb)))
|
|
return __zerocopy_sg_from_iter(NULL, sk, skb, from, length);
|
|
|
|
bi.bi_size = min(from->count, length);
|
|
bi.bi_bvec_done = from->iov_offset;
|
|
bi.bi_idx = 0;
|
|
|
|
while (bi.bi_size && frag < MAX_SKB_FRAGS) {
|
|
struct bio_vec v = mp_bvec_iter_bvec(from->bvec, bi);
|
|
|
|
copied += v.bv_len;
|
|
truesize += PAGE_ALIGN(v.bv_len + v.bv_offset);
|
|
__skb_fill_page_desc_noacc(shinfo, frag++, v.bv_page,
|
|
v.bv_offset, v.bv_len);
|
|
bvec_iter_advance_single(from->bvec, &bi, v.bv_len);
|
|
}
|
|
if (bi.bi_size)
|
|
ret = -EMSGSIZE;
|
|
|
|
shinfo->nr_frags = frag;
|
|
from->bvec += bi.bi_idx;
|
|
from->nr_segs -= bi.bi_idx;
|
|
from->count -= copied;
|
|
from->iov_offset = bi.bi_bvec_done;
|
|
|
|
skb->data_len += copied;
|
|
skb->len += copied;
|
|
skb->truesize += truesize;
|
|
|
|
if (sk && sk->sk_type == SOCK_STREAM) {
|
|
sk_wmem_queued_add(sk, truesize);
|
|
if (!skb_zcopy_pure(skb))
|
|
sk_mem_charge(sk, truesize);
|
|
} else {
|
|
refcount_add(truesize, &skb->sk->sk_wmem_alloc);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int io_send_zc_import(struct io_kiocb *req, struct io_async_msghdr *kmsg)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
int ret;
|
|
|
|
if (sr->flags & IORING_RECVSEND_FIXED_BUF) {
|
|
ret = io_import_fixed(ITER_SOURCE, &kmsg->msg.msg_iter, req->imu,
|
|
(u64)(uintptr_t)sr->buf, sr->len);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
kmsg->msg.sg_from_iter = io_sg_from_iter;
|
|
} else {
|
|
ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &kmsg->msg.msg_iter);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
ret = io_notif_account_mem(sr->notif, sr->len);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_async_msghdr *kmsg = req->async_data;
|
|
struct socket *sock;
|
|
unsigned msg_flags;
|
|
int ret, min_ret = 0;
|
|
|
|
sock = sock_from_file(req->file);
|
|
if (unlikely(!sock))
|
|
return -ENOTSOCK;
|
|
if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!(req->flags & REQ_F_POLLED) &&
|
|
(zc->flags & IORING_RECVSEND_POLL_FIRST))
|
|
return -EAGAIN;
|
|
|
|
if (!zc->done_io) {
|
|
ret = io_send_zc_import(req, kmsg);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
}
|
|
|
|
msg_flags = zc->msg_flags;
|
|
if (issue_flags & IO_URING_F_NONBLOCK)
|
|
msg_flags |= MSG_DONTWAIT;
|
|
if (msg_flags & MSG_WAITALL)
|
|
min_ret = iov_iter_count(&kmsg->msg.msg_iter);
|
|
msg_flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
|
|
|
|
kmsg->msg.msg_flags = msg_flags;
|
|
kmsg->msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg;
|
|
ret = sock_sendmsg(sock, &kmsg->msg);
|
|
|
|
if (unlikely(ret < min_ret)) {
|
|
if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
|
|
return -EAGAIN;
|
|
|
|
if (ret > 0 && io_net_retry(sock, kmsg->msg.msg_flags)) {
|
|
zc->len -= ret;
|
|
zc->buf += ret;
|
|
zc->done_io += ret;
|
|
req->flags |= REQ_F_BL_NO_RECYCLE;
|
|
return -EAGAIN;
|
|
}
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
req_set_fail(req);
|
|
}
|
|
|
|
if (ret >= 0)
|
|
ret += zc->done_io;
|
|
else if (zc->done_io)
|
|
ret = zc->done_io;
|
|
|
|
/*
|
|
* If we're in io-wq we can't rely on tw ordering guarantees, defer
|
|
* flushing notif to io_send_zc_cleanup()
|
|
*/
|
|
if (!(issue_flags & IO_URING_F_UNLOCKED)) {
|
|
io_notif_flush(zc->notif);
|
|
io_req_msg_cleanup(req, 0);
|
|
}
|
|
io_req_set_res(req, ret, IORING_CQE_F_MORE);
|
|
return IOU_OK;
|
|
}
|
|
|
|
int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
struct io_async_msghdr *kmsg = req->async_data;
|
|
struct socket *sock;
|
|
unsigned flags;
|
|
int ret, min_ret = 0;
|
|
|
|
sock = sock_from_file(req->file);
|
|
if (unlikely(!sock))
|
|
return -ENOTSOCK;
|
|
if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!(req->flags & REQ_F_POLLED) &&
|
|
(sr->flags & IORING_RECVSEND_POLL_FIRST))
|
|
return -EAGAIN;
|
|
|
|
flags = sr->msg_flags;
|
|
if (issue_flags & IO_URING_F_NONBLOCK)
|
|
flags |= MSG_DONTWAIT;
|
|
if (flags & MSG_WAITALL)
|
|
min_ret = iov_iter_count(&kmsg->msg.msg_iter);
|
|
|
|
kmsg->msg.msg_control_user = sr->msg_control;
|
|
kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg;
|
|
kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
|
|
ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
|
|
|
|
if (unlikely(ret < min_ret)) {
|
|
if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
|
|
return -EAGAIN;
|
|
|
|
if (ret > 0 && io_net_retry(sock, flags)) {
|
|
sr->done_io += ret;
|
|
req->flags |= REQ_F_BL_NO_RECYCLE;
|
|
return -EAGAIN;
|
|
}
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
req_set_fail(req);
|
|
}
|
|
|
|
if (ret >= 0)
|
|
ret += sr->done_io;
|
|
else if (sr->done_io)
|
|
ret = sr->done_io;
|
|
|
|
/*
|
|
* If we're in io-wq we can't rely on tw ordering guarantees, defer
|
|
* flushing notif to io_send_zc_cleanup()
|
|
*/
|
|
if (!(issue_flags & IO_URING_F_UNLOCKED)) {
|
|
io_notif_flush(sr->notif);
|
|
io_req_msg_cleanup(req, 0);
|
|
}
|
|
io_req_set_res(req, ret, IORING_CQE_F_MORE);
|
|
return IOU_OK;
|
|
}
|
|
|
|
void io_sendrecv_fail(struct io_kiocb *req)
|
|
{
|
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
|
|
|
|
if (sr->done_io)
|
|
req->cqe.res = sr->done_io;
|
|
|
|
if ((req->flags & REQ_F_NEED_CLEANUP) &&
|
|
(req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC))
|
|
req->cqe.flags |= IORING_CQE_F_MORE;
|
|
}
|
|
|
|
#define ACCEPT_FLAGS (IORING_ACCEPT_MULTISHOT | IORING_ACCEPT_DONTWAIT | \
|
|
IORING_ACCEPT_POLL_FIRST)
|
|
|
|
int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
|
|
|
|
if (sqe->len || sqe->buf_index)
|
|
return -EINVAL;
|
|
|
|
accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
|
|
accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
|
|
accept->flags = READ_ONCE(sqe->accept_flags);
|
|
accept->nofile = rlimit(RLIMIT_NOFILE);
|
|
accept->iou_flags = READ_ONCE(sqe->ioprio);
|
|
if (accept->iou_flags & ~ACCEPT_FLAGS)
|
|
return -EINVAL;
|
|
|
|
accept->file_slot = READ_ONCE(sqe->file_index);
|
|
if (accept->file_slot) {
|
|
if (accept->flags & SOCK_CLOEXEC)
|
|
return -EINVAL;
|
|
if (accept->iou_flags & IORING_ACCEPT_MULTISHOT &&
|
|
accept->file_slot != IORING_FILE_INDEX_ALLOC)
|
|
return -EINVAL;
|
|
}
|
|
if (accept->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
|
|
return -EINVAL;
|
|
if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
|
|
accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
|
|
if (accept->iou_flags & IORING_ACCEPT_MULTISHOT)
|
|
req->flags |= REQ_F_APOLL_MULTISHOT;
|
|
if (accept->iou_flags & IORING_ACCEPT_DONTWAIT)
|
|
req->flags |= REQ_F_NOWAIT;
|
|
return 0;
|
|
}
|
|
|
|
int io_accept(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
|
|
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
|
|
bool fixed = !!accept->file_slot;
|
|
struct proto_accept_arg arg = {
|
|
.flags = force_nonblock ? O_NONBLOCK : 0,
|
|
};
|
|
struct file *file;
|
|
unsigned cflags;
|
|
int ret, fd;
|
|
|
|
if (!(req->flags & REQ_F_POLLED) &&
|
|
accept->iou_flags & IORING_ACCEPT_POLL_FIRST)
|
|
return -EAGAIN;
|
|
|
|
retry:
|
|
if (!fixed) {
|
|
fd = __get_unused_fd_flags(accept->flags, accept->nofile);
|
|
if (unlikely(fd < 0))
|
|
return fd;
|
|
}
|
|
arg.err = 0;
|
|
arg.is_empty = -1;
|
|
file = do_accept(req->file, &arg, accept->addr, accept->addr_len,
|
|
accept->flags);
|
|
if (IS_ERR(file)) {
|
|
if (!fixed)
|
|
put_unused_fd(fd);
|
|
ret = PTR_ERR(file);
|
|
if (ret == -EAGAIN && force_nonblock &&
|
|
!(accept->iou_flags & IORING_ACCEPT_DONTWAIT)) {
|
|
/*
|
|
* if it's multishot and polled, we don't need to
|
|
* return EAGAIN to arm the poll infra since it
|
|
* has already been done
|
|
*/
|
|
if (issue_flags & IO_URING_F_MULTISHOT)
|
|
return IOU_ISSUE_SKIP_COMPLETE;
|
|
return ret;
|
|
}
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
req_set_fail(req);
|
|
} else if (!fixed) {
|
|
fd_install(fd, file);
|
|
ret = fd;
|
|
} else {
|
|
ret = io_fixed_fd_install(req, issue_flags, file,
|
|
accept->file_slot);
|
|
}
|
|
|
|
cflags = 0;
|
|
if (!arg.is_empty)
|
|
cflags |= IORING_CQE_F_SOCK_NONEMPTY;
|
|
|
|
if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
|
|
io_req_set_res(req, ret, cflags);
|
|
return IOU_OK;
|
|
}
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
if (io_req_post_cqe(req, ret, cflags | IORING_CQE_F_MORE)) {
|
|
if (cflags & IORING_CQE_F_SOCK_NONEMPTY || arg.is_empty == -1)
|
|
goto retry;
|
|
if (issue_flags & IO_URING_F_MULTISHOT)
|
|
return IOU_ISSUE_SKIP_COMPLETE;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
io_req_set_res(req, ret, cflags);
|
|
return IOU_STOP_MULTISHOT;
|
|
}
|
|
|
|
int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
|
|
|
|
if (sqe->addr || sqe->rw_flags || sqe->buf_index)
|
|
return -EINVAL;
|
|
|
|
sock->domain = READ_ONCE(sqe->fd);
|
|
sock->type = READ_ONCE(sqe->off);
|
|
sock->protocol = READ_ONCE(sqe->len);
|
|
sock->file_slot = READ_ONCE(sqe->file_index);
|
|
sock->nofile = rlimit(RLIMIT_NOFILE);
|
|
|
|
sock->flags = sock->type & ~SOCK_TYPE_MASK;
|
|
if (sock->file_slot && (sock->flags & SOCK_CLOEXEC))
|
|
return -EINVAL;
|
|
if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
int io_socket(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket);
|
|
bool fixed = !!sock->file_slot;
|
|
struct file *file;
|
|
int ret, fd;
|
|
|
|
if (!fixed) {
|
|
fd = __get_unused_fd_flags(sock->flags, sock->nofile);
|
|
if (unlikely(fd < 0))
|
|
return fd;
|
|
}
|
|
file = __sys_socket_file(sock->domain, sock->type, sock->protocol);
|
|
if (IS_ERR(file)) {
|
|
if (!fixed)
|
|
put_unused_fd(fd);
|
|
ret = PTR_ERR(file);
|
|
if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
|
|
return -EAGAIN;
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
req_set_fail(req);
|
|
} else if (!fixed) {
|
|
fd_install(fd, file);
|
|
ret = fd;
|
|
} else {
|
|
ret = io_fixed_fd_install(req, issue_flags, file,
|
|
sock->file_slot);
|
|
}
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|
|
|
|
int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
|
|
{
|
|
struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect);
|
|
struct io_async_msghdr *io;
|
|
|
|
if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
|
|
return -EINVAL;
|
|
|
|
conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
|
|
conn->addr_len = READ_ONCE(sqe->addr2);
|
|
conn->in_progress = conn->seen_econnaborted = false;
|
|
|
|
io = io_msg_alloc_async(req);
|
|
if (unlikely(!io))
|
|
return -ENOMEM;
|
|
|
|
return move_addr_to_kernel(conn->addr, conn->addr_len, &io->addr);
|
|
}
|
|
|
|
int io_connect(struct io_kiocb *req, unsigned int issue_flags)
|
|
{
|
|
struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect);
|
|
struct io_async_msghdr *io = req->async_data;
|
|
unsigned file_flags;
|
|
int ret;
|
|
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
|
|
|
|
file_flags = force_nonblock ? O_NONBLOCK : 0;
|
|
|
|
ret = __sys_connect_file(req->file, &io->addr, connect->addr_len,
|
|
file_flags);
|
|
if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED)
|
|
&& force_nonblock) {
|
|
if (ret == -EINPROGRESS) {
|
|
connect->in_progress = true;
|
|
} else if (ret == -ECONNABORTED) {
|
|
if (connect->seen_econnaborted)
|
|
goto out;
|
|
connect->seen_econnaborted = true;
|
|
}
|
|
return -EAGAIN;
|
|
}
|
|
if (connect->in_progress) {
|
|
/*
|
|
* At least bluetooth will return -EBADFD on a re-connect
|
|
* attempt, and it's (supposedly) also valid to get -EISCONN
|
|
* which means the previous result is good. For both of these,
|
|
* grab the sock_error() and use that for the completion.
|
|
*/
|
|
if (ret == -EBADFD || ret == -EISCONN)
|
|
ret = sock_error(sock_from_file(req->file)->sk);
|
|
}
|
|
if (ret == -ERESTARTSYS)
|
|
ret = -EINTR;
|
|
out:
|
|
if (ret < 0)
|
|
req_set_fail(req);
|
|
io_req_msg_cleanup(req, issue_flags);
|
|
io_req_set_res(req, ret, 0);
|
|
return IOU_OK;
|
|
}
|
|
|
|
void io_netmsg_cache_free(const void *entry)
|
|
{
|
|
struct io_async_msghdr *kmsg = (struct io_async_msghdr *) entry;
|
|
|
|
if (kmsg->free_iov) {
|
|
kasan_mempool_unpoison_object(kmsg->free_iov,
|
|
kmsg->free_iov_nr * sizeof(struct iovec));
|
|
io_netmsg_iovec_free(kmsg);
|
|
}
|
|
kfree(kmsg);
|
|
}
|
|
#endif
|