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1453 lines
36 KiB
1453 lines
36 KiB
// 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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|
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#include <uapi/linux/io_uring.h> |
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|
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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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|
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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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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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}; |
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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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unsigned len; |
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unsigned done_io; |
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unsigned msg_flags; |
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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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void __user *addr; |
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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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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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|
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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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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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if (issue_flags & IO_URING_F_NONBLOCK) |
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return -EAGAIN; |
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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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|
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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_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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if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) |
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return; |
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/* Let normal cleanup path reap it if we fail adding to the cache */ |
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if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { |
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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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unsigned int issue_flags) |
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{ |
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struct io_ring_ctx *ctx = req->ctx; |
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struct io_cache_entry *entry; |
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struct io_async_msghdr *hdr; |
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if (!(issue_flags & IO_URING_F_UNLOCKED) && |
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(entry = io_alloc_cache_get(&ctx->netmsg_cache)) != NULL) { |
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hdr = container_of(entry, struct io_async_msghdr, cache); |
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hdr->free_iov = NULL; |
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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 = 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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static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req) |
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{ |
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/* ->prep_async is always called from the submission context */ |
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return io_msg_alloc_async(req, 0); |
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} |
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static int io_setup_async_msg(struct io_kiocb *req, |
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struct io_async_msghdr *kmsg, |
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unsigned int issue_flags) |
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{ |
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struct io_async_msghdr *async_msg; |
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|
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if (req_has_async_data(req)) |
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return -EAGAIN; |
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async_msg = io_msg_alloc_async(req, issue_flags); |
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if (!async_msg) { |
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kfree(kmsg->free_iov); |
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return -ENOMEM; |
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} |
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req->flags |= REQ_F_NEED_CLEANUP; |
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memcpy(async_msg, kmsg, sizeof(*kmsg)); |
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if (async_msg->msg.msg_name) |
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async_msg->msg.msg_name = &async_msg->addr; |
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/* if were using fast_iov, set it to the new one */ |
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if (!kmsg->free_iov) { |
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size_t fast_idx = kmsg->msg.msg_iter.iov - kmsg->fast_iov; |
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async_msg->msg.msg_iter.iov = &async_msg->fast_iov[fast_idx]; |
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} |
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return -EAGAIN; |
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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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|
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iomsg->msg.msg_name = &iomsg->addr; |
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iomsg->free_iov = iomsg->fast_iov; |
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return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, |
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&iomsg->free_iov); |
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} |
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int io_send_prep_async(struct io_kiocb *req) |
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{ |
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struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
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struct io_async_msghdr *io; |
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int ret; |
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if (!zc->addr || req_has_async_data(req)) |
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return 0; |
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io = io_msg_alloc_async_prep(req); |
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if (!io) |
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return -ENOMEM; |
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ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); |
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return ret; |
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} |
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static int io_setup_async_addr(struct io_kiocb *req, |
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struct sockaddr_storage *addr_storage, |
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unsigned int issue_flags) |
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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 *io; |
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|
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if (!sr->addr || req_has_async_data(req)) |
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return -EAGAIN; |
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io = io_msg_alloc_async(req, issue_flags); |
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if (!io) |
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return -ENOMEM; |
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memcpy(&io->addr, addr_storage, sizeof(io->addr)); |
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return -EAGAIN; |
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} |
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int io_sendmsg_prep_async(struct io_kiocb *req) |
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{ |
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int ret; |
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if (!io_msg_alloc_async_prep(req)) |
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return -ENOMEM; |
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ret = io_sendmsg_copy_hdr(req, req->async_data); |
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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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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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kfree(io->free_iov); |
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} |
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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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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 & ~IORING_RECVSEND_POLL_FIRST) |
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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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#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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sr->done_io = 0; |
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return 0; |
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} |
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int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags) |
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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 iomsg, *kmsg; |
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struct socket *sock; |
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unsigned flags; |
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int min_ret = 0; |
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int ret; |
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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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if (req_has_async_data(req)) { |
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kmsg = req->async_data; |
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} else { |
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ret = io_sendmsg_copy_hdr(req, &iomsg); |
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if (ret) |
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return ret; |
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kmsg = &iomsg; |
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} |
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if (!(req->flags & REQ_F_POLLED) && |
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(sr->flags & IORING_RECVSEND_POLL_FIRST)) |
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return io_setup_async_msg(req, kmsg, issue_flags); |
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flags = sr->msg_flags; |
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if (issue_flags & IO_URING_F_NONBLOCK) |
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flags |= MSG_DONTWAIT; |
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if (flags & MSG_WAITALL) |
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min_ret = iov_iter_count(&kmsg->msg.msg_iter); |
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ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); |
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if (ret < min_ret) { |
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if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) |
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return io_setup_async_msg(req, kmsg, issue_flags); |
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if (ret > 0 && io_net_retry(sock, flags)) { |
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sr->done_io += ret; |
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req->flags |= REQ_F_PARTIAL_IO; |
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return io_setup_async_msg(req, kmsg, issue_flags); |
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} |
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if (ret == -ERESTARTSYS) |
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ret = -EINTR; |
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req_set_fail(req); |
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} |
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/* fast path, check for non-NULL to avoid function call */ |
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if (kmsg->free_iov) |
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kfree(kmsg->free_iov); |
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req->flags &= ~REQ_F_NEED_CLEANUP; |
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io_netmsg_recycle(req, issue_flags); |
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if (ret >= 0) |
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ret += sr->done_io; |
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else if (sr->done_io) |
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ret = sr->done_io; |
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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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int io_send(struct io_kiocb *req, unsigned int issue_flags) |
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{ |
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struct sockaddr_storage __address; |
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struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
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struct msghdr msg; |
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struct iovec iov; |
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struct socket *sock; |
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unsigned flags; |
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int min_ret = 0; |
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int ret; |
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msg.msg_name = NULL; |
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msg.msg_control = NULL; |
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msg.msg_controllen = 0; |
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msg.msg_namelen = 0; |
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msg.msg_ubuf = NULL; |
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if (sr->addr) { |
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if (req_has_async_data(req)) { |
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struct io_async_msghdr *io = req->async_data; |
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msg.msg_name = &io->addr; |
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} else { |
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ret = move_addr_to_kernel(sr->addr, sr->addr_len, &__address); |
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if (unlikely(ret < 0)) |
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return ret; |
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msg.msg_name = (struct sockaddr *)&__address; |
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} |
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msg.msg_namelen = sr->addr_len; |
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} |
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if (!(req->flags & REQ_F_POLLED) && |
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(sr->flags & IORING_RECVSEND_POLL_FIRST)) |
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return io_setup_async_addr(req, &__address, issue_flags); |
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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 = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter); |
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if (unlikely(ret)) |
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return ret; |
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flags = sr->msg_flags; |
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if (issue_flags & IO_URING_F_NONBLOCK) |
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flags |= MSG_DONTWAIT; |
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if (flags & MSG_WAITALL) |
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min_ret = iov_iter_count(&msg.msg_iter); |
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msg.msg_flags = flags; |
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ret = sock_sendmsg(sock, &msg); |
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if (ret < min_ret) { |
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if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) |
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return io_setup_async_addr(req, &__address, issue_flags); |
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if (ret > 0 && io_net_retry(sock, flags)) { |
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sr->len -= ret; |
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sr->buf += ret; |
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sr->done_io += ret; |
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req->flags |= REQ_F_PARTIAL_IO; |
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return io_setup_async_addr(req, &__address, issue_flags); |
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} |
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if (ret == -ERESTARTSYS) |
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ret = -EINTR; |
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req_set_fail(req); |
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} |
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if (ret >= 0) |
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ret += sr->done_io; |
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else if (sr->done_io) |
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ret = sr->done_io; |
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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_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) |
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{ |
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int hdr; |
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|
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if (iomsg->namelen < 0) |
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return true; |
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if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), |
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iomsg->namelen, &hdr)) |
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return true; |
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if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) |
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return true; |
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return false; |
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} |
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static int __io_recvmsg_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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|
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if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) |
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return -EFAULT; |
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ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); |
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if (ret) |
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return ret; |
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|
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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 = iomsg->fast_iov[0].iov_len = 0; |
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iomsg->fast_iov[0].iov_base = NULL; |
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iomsg->free_iov = 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 (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) |
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return -EFAULT; |
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sr->len = iomsg->fast_iov[0].iov_len; |
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iomsg->free_iov = NULL; |
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} |
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|
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if (req->flags & REQ_F_APOLL_MULTISHOT) { |
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iomsg->namelen = msg.msg_namelen; |
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iomsg->controllen = msg.msg_controllen; |
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if (io_recvmsg_multishot_overflow(iomsg)) |
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return -EOVERFLOW; |
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} |
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} else { |
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iomsg->free_iov = iomsg->fast_iov; |
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ret = __import_iovec(READ, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, |
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&iomsg->free_iov, &iomsg->msg.msg_iter, |
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false); |
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if (ret > 0) |
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ret = 0; |
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} |
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|
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return ret; |
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} |
|
|
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#ifdef CONFIG_COMPAT |
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static int __io_compat_recvmsg_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 compat_msghdr msg; |
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struct compat_iovec __user *uiov; |
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int ret; |
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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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ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); |
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if (ret) |
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return ret; |
|
|
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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 = 0; |
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} else if (msg.msg_iovlen > 1) { |
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return -EINVAL; |
|
} 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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if (req->flags & REQ_F_APOLL_MULTISHOT) { |
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iomsg->namelen = msg.msg_namelen; |
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iomsg->controllen = msg.msg_controllen; |
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if (io_recvmsg_multishot_overflow(iomsg)) |
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return -EOVERFLOW; |
|
} |
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} else { |
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iomsg->free_iov = iomsg->fast_iov; |
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ret = __import_iovec(READ, (struct iovec __user *)uiov, msg.msg_iovlen, |
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UIO_FASTIOV, &iomsg->free_iov, |
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&iomsg->msg.msg_iter, true); |
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if (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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#endif |
|
|
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static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
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struct io_async_msghdr *iomsg) |
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{ |
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iomsg->msg.msg_name = &iomsg->addr; |
|
|
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#ifdef CONFIG_COMPAT |
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if (req->ctx->compat) |
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return __io_compat_recvmsg_copy_hdr(req, iomsg); |
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#endif |
|
|
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return __io_recvmsg_copy_hdr(req, iomsg); |
|
} |
|
|
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int io_recvmsg_prep_async(struct io_kiocb *req) |
|
{ |
|
int ret; |
|
|
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if (!io_msg_alloc_async_prep(req)) |
|
return -ENOMEM; |
|
ret = io_recvmsg_copy_hdr(req, req->async_data); |
|
if (!ret) |
|
req->flags |= REQ_F_NEED_CLEANUP; |
|
return ret; |
|
} |
|
|
|
#define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT) |
|
|
|
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); |
|
|
|
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) | MSG_NOSIGNAL; |
|
if (sr->msg_flags & MSG_DONTWAIT) |
|
req->flags |= REQ_F_NOWAIT; |
|
if (sr->msg_flags & MSG_ERRQUEUE) |
|
req->flags |= REQ_F_CLEAR_POLLIN; |
|
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; |
|
} |
|
|
|
#ifdef CONFIG_COMPAT |
|
if (req->ctx->compat) |
|
sr->msg_flags |= MSG_CMSG_COMPAT; |
|
#endif |
|
sr->done_io = 0; |
|
return 0; |
|
} |
|
|
|
static inline void io_recv_prep_retry(struct io_kiocb *req) |
|
{ |
|
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
|
|
|
sr->done_io = 0; |
|
sr->len = 0; /* get from the provided buffer */ |
|
} |
|
|
|
/* |
|
* 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, |
|
unsigned int cflags, bool mshot_finished, |
|
unsigned issue_flags) |
|
{ |
|
if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { |
|
io_req_set_res(req, *ret, cflags); |
|
*ret = IOU_OK; |
|
return true; |
|
} |
|
|
|
if (!mshot_finished) { |
|
if (io_post_aux_cqe(req->ctx, req->cqe.user_data, *ret, |
|
cflags | IORING_CQE_F_MORE, false)) { |
|
io_recv_prep_retry(req); |
|
return false; |
|
} |
|
/* |
|
* Otherwise stop multishot but use the current result. |
|
* Probably will end up going into overflow, but this means |
|
* we cannot trust the ordering anymore |
|
*/ |
|
} |
|
|
|
io_req_set_res(req, *ret, cflags); |
|
|
|
if (issue_flags & IO_URING_F_MULTISHOT) |
|
*ret = IOU_STOP_MULTISHOT; |
|
else |
|
*ret = IOU_OK; |
|
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 iomsg, *kmsg; |
|
struct socket *sock; |
|
unsigned int cflags; |
|
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_has_async_data(req)) { |
|
kmsg = req->async_data; |
|
} else { |
|
ret = io_recvmsg_copy_hdr(req, &iomsg); |
|
if (ret) |
|
return ret; |
|
kmsg = &iomsg; |
|
} |
|
|
|
if (!(req->flags & REQ_F_POLLED) && |
|
(sr->flags & IORING_RECVSEND_POLL_FIRST)) |
|
return io_setup_async_msg(req, kmsg, issue_flags); |
|
|
|
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; |
|
} |
|
} |
|
|
|
kmsg->fast_iov[0].iov_base = buf; |
|
kmsg->fast_iov[0].iov_len = len; |
|
iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->fast_iov, 1, |
|
len); |
|
} |
|
|
|
flags = sr->msg_flags; |
|
if (force_nonblock) |
|
flags |= MSG_DONTWAIT; |
|
if (flags & MSG_WAITALL) |
|
min_ret = iov_iter_count(&kmsg->msg.msg_iter); |
|
|
|
kmsg->msg.msg_get_inq = 1; |
|
if (req->flags & REQ_F_APOLL_MULTISHOT) |
|
ret = io_recvmsg_multishot(sock, sr, kmsg, flags, |
|
&mshot_finished); |
|
else |
|
ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, |
|
kmsg->uaddr, flags); |
|
|
|
if (ret < min_ret) { |
|
if (ret == -EAGAIN && force_nonblock) { |
|
ret = io_setup_async_msg(req, kmsg, issue_flags); |
|
if (ret == -EAGAIN && (issue_flags & IO_URING_F_MULTISHOT)) { |
|
io_kbuf_recycle(req, issue_flags); |
|
return IOU_ISSUE_SKIP_COMPLETE; |
|
} |
|
return ret; |
|
} |
|
if (ret > 0 && io_net_retry(sock, flags)) { |
|
sr->done_io += ret; |
|
req->flags |= REQ_F_PARTIAL_IO; |
|
return io_setup_async_msg(req, kmsg, issue_flags); |
|
} |
|
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); |
|
|
|
cflags = io_put_kbuf(req, issue_flags); |
|
if (kmsg->msg.msg_inq) |
|
cflags |= IORING_CQE_F_SOCK_NONEMPTY; |
|
|
|
if (!io_recv_finish(req, &ret, cflags, mshot_finished, issue_flags)) |
|
goto retry_multishot; |
|
|
|
if (mshot_finished) { |
|
io_netmsg_recycle(req, issue_flags); |
|
/* fast path, check for non-NULL to avoid function call */ |
|
if (kmsg->free_iov) |
|
kfree(kmsg->free_iov); |
|
req->flags &= ~REQ_F_NEED_CLEANUP; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
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 msghdr msg; |
|
struct socket *sock; |
|
struct iovec iov; |
|
unsigned int cflags; |
|
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; |
|
|
|
retry_multishot: |
|
if (io_do_buffer_select(req)) { |
|
void __user *buf; |
|
|
|
buf = io_buffer_select(req, &len, issue_flags); |
|
if (!buf) |
|
return -ENOBUFS; |
|
sr->buf = buf; |
|
} |
|
|
|
ret = import_single_range(READ, sr->buf, len, &iov, &msg.msg_iter); |
|
if (unlikely(ret)) |
|
goto out_free; |
|
|
|
msg.msg_name = NULL; |
|
msg.msg_namelen = 0; |
|
msg.msg_control = NULL; |
|
msg.msg_get_inq = 1; |
|
msg.msg_flags = 0; |
|
msg.msg_controllen = 0; |
|
msg.msg_iocb = NULL; |
|
msg.msg_ubuf = NULL; |
|
|
|
flags = sr->msg_flags; |
|
if (force_nonblock) |
|
flags |= MSG_DONTWAIT; |
|
if (flags & MSG_WAITALL) |
|
min_ret = iov_iter_count(&msg.msg_iter); |
|
|
|
ret = sock_recvmsg(sock, &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_PARTIAL_IO; |
|
return -EAGAIN; |
|
} |
|
if (ret == -ERESTARTSYS) |
|
ret = -EINTR; |
|
req_set_fail(req); |
|
} else if ((flags & MSG_WAITALL) && (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); |
|
|
|
cflags = io_put_kbuf(req, issue_flags); |
|
if (msg.msg_inq) |
|
cflags |= IORING_CQE_F_SOCK_NONEMPTY; |
|
|
|
if (!io_recv_finish(req, &ret, cflags, 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; |
|
|
|
if (req_has_async_data(req)) { |
|
io = req->async_data; |
|
/* might be ->fast_iov if *msg_copy_hdr failed */ |
|
if (io->free_iov != io->fast_iov) |
|
kfree(io->free_iov); |
|
} |
|
if (zc->notif) { |
|
io_notif_flush(zc->notif); |
|
zc->notif = NULL; |
|
} |
|
} |
|
|
|
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; |
|
|
|
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; |
|
|
|
zc->flags = READ_ONCE(sqe->ioprio); |
|
if (zc->flags & ~(IORING_RECVSEND_POLL_FIRST | |
|
IORING_RECVSEND_FIXED_BUF)) |
|
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; |
|
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; |
|
if (zc->msg_flags & MSG_DONTWAIT) |
|
req->flags |= REQ_F_NOWAIT; |
|
|
|
zc->done_io = 0; |
|
|
|
#ifdef CONFIG_COMPAT |
|
if (req->ctx->compat) |
|
zc->msg_flags |= MSG_CMSG_COMPAT; |
|
#endif |
|
return 0; |
|
} |
|
|
|
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; |
|
} |
|
|
|
int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) |
|
{ |
|
struct sockaddr_storage __address; |
|
struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); |
|
struct msghdr msg; |
|
struct iovec iov; |
|
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; |
|
|
|
msg.msg_name = NULL; |
|
msg.msg_control = NULL; |
|
msg.msg_controllen = 0; |
|
msg.msg_namelen = 0; |
|
|
|
if (zc->addr) { |
|
if (req_has_async_data(req)) { |
|
struct io_async_msghdr *io = req->async_data; |
|
|
|
msg.msg_name = &io->addr; |
|
} else { |
|
ret = move_addr_to_kernel(zc->addr, zc->addr_len, &__address); |
|
if (unlikely(ret < 0)) |
|
return ret; |
|
msg.msg_name = (struct sockaddr *)&__address; |
|
} |
|
msg.msg_namelen = zc->addr_len; |
|
} |
|
|
|
if (!(req->flags & REQ_F_POLLED) && |
|
(zc->flags & IORING_RECVSEND_POLL_FIRST)) |
|
return io_setup_async_addr(req, &__address, issue_flags); |
|
|
|
if (zc->flags & IORING_RECVSEND_FIXED_BUF) { |
|
ret = io_import_fixed(WRITE, &msg.msg_iter, req->imu, |
|
(u64)(uintptr_t)zc->buf, zc->len); |
|
if (unlikely(ret)) |
|
return ret; |
|
msg.sg_from_iter = io_sg_from_iter; |
|
} else { |
|
ret = import_single_range(WRITE, zc->buf, zc->len, &iov, |
|
&msg.msg_iter); |
|
if (unlikely(ret)) |
|
return ret; |
|
ret = io_notif_account_mem(zc->notif, zc->len); |
|
if (unlikely(ret)) |
|
return ret; |
|
msg.sg_from_iter = io_sg_from_iter_iovec; |
|
} |
|
|
|
msg_flags = zc->msg_flags | MSG_ZEROCOPY; |
|
if (issue_flags & IO_URING_F_NONBLOCK) |
|
msg_flags |= MSG_DONTWAIT; |
|
if (msg_flags & MSG_WAITALL) |
|
min_ret = iov_iter_count(&msg.msg_iter); |
|
|
|
msg.msg_flags = msg_flags; |
|
msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg; |
|
ret = sock_sendmsg(sock, &msg); |
|
|
|
if (unlikely(ret < min_ret)) { |
|
if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) |
|
return io_setup_async_addr(req, &__address, issue_flags); |
|
|
|
if (ret > 0 && io_net_retry(sock, msg.msg_flags)) { |
|
zc->len -= ret; |
|
zc->buf += ret; |
|
zc->done_io += ret; |
|
req->flags |= REQ_F_PARTIAL_IO; |
|
return io_setup_async_addr(req, &__address, issue_flags); |
|
} |
|
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); |
|
req->flags &= ~REQ_F_NEED_CLEANUP; |
|
} |
|
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 iomsg, *kmsg; |
|
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_has_async_data(req)) { |
|
kmsg = req->async_data; |
|
} else { |
|
ret = io_sendmsg_copy_hdr(req, &iomsg); |
|
if (ret) |
|
return ret; |
|
kmsg = &iomsg; |
|
} |
|
|
|
if (!(req->flags & REQ_F_POLLED) && |
|
(sr->flags & IORING_RECVSEND_POLL_FIRST)) |
|
return io_setup_async_msg(req, kmsg, issue_flags); |
|
|
|
flags = sr->msg_flags | MSG_ZEROCOPY; |
|
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_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 io_setup_async_msg(req, kmsg, issue_flags); |
|
|
|
if (ret > 0 && io_net_retry(sock, flags)) { |
|
sr->done_io += ret; |
|
req->flags |= REQ_F_PARTIAL_IO; |
|
return io_setup_async_msg(req, kmsg, issue_flags); |
|
} |
|
if (ret == -ERESTARTSYS) |
|
ret = -EINTR; |
|
req_set_fail(req); |
|
} |
|
/* fast path, check for non-NULL to avoid function call */ |
|
if (kmsg->free_iov) { |
|
kfree(kmsg->free_iov); |
|
kmsg->free_iov = NULL; |
|
} |
|
|
|
io_netmsg_recycle(req, issue_flags); |
|
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); |
|
req->flags &= ~REQ_F_NEED_CLEANUP; |
|
} |
|
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 (req->flags & REQ_F_PARTIAL_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; |
|
} |
|
|
|
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); |
|
unsigned flags; |
|
|
|
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); |
|
flags = READ_ONCE(sqe->ioprio); |
|
if (flags & ~IORING_ACCEPT_MULTISHOT) |
|
return -EINVAL; |
|
|
|
accept->file_slot = READ_ONCE(sqe->file_index); |
|
if (accept->file_slot) { |
|
if (accept->flags & SOCK_CLOEXEC) |
|
return -EINVAL; |
|
if (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 (flags & IORING_ACCEPT_MULTISHOT) |
|
req->flags |= REQ_F_APOLL_MULTISHOT; |
|
return 0; |
|
} |
|
|
|
int io_accept(struct io_kiocb *req, unsigned int issue_flags) |
|
{ |
|
struct io_ring_ctx *ctx = req->ctx; |
|
struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept); |
|
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
|
unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0; |
|
bool fixed = !!accept->file_slot; |
|
struct file *file; |
|
int ret, fd; |
|
|
|
retry: |
|
if (!fixed) { |
|
fd = __get_unused_fd_flags(accept->flags, accept->nofile); |
|
if (unlikely(fd < 0)) |
|
return fd; |
|
} |
|
file = do_accept(req->file, file_flags, 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) { |
|
/* |
|
* 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) |
|
ret = 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); |
|
} |
|
|
|
if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { |
|
io_req_set_res(req, ret, 0); |
|
return IOU_OK; |
|
} |
|
|
|
if (ret >= 0 && |
|
io_post_aux_cqe(ctx, req->cqe.user_data, ret, IORING_CQE_F_MORE, false)) |
|
goto retry; |
|
|
|
io_req_set_res(req, ret, 0); |
|
return (issue_flags & IO_URING_F_MULTISHOT) ? IOU_STOP_MULTISHOT : IOU_OK; |
|
} |
|
|
|
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_async(struct io_kiocb *req) |
|
{ |
|
struct io_async_connect *io = req->async_data; |
|
struct io_connect *conn = io_kiocb_to_cmd(req, struct io_connect); |
|
|
|
return move_addr_to_kernel(conn->addr, conn->addr_len, &io->address); |
|
} |
|
|
|
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); |
|
|
|
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 = false; |
|
return 0; |
|
} |
|
|
|
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_connect __io, *io; |
|
unsigned file_flags; |
|
int ret; |
|
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK; |
|
|
|
if (connect->in_progress) { |
|
struct socket *socket; |
|
|
|
ret = -ENOTSOCK; |
|
socket = sock_from_file(req->file); |
|
if (socket) |
|
ret = sock_error(socket->sk); |
|
goto out; |
|
} |
|
|
|
if (req_has_async_data(req)) { |
|
io = req->async_data; |
|
} else { |
|
ret = move_addr_to_kernel(connect->addr, |
|
connect->addr_len, |
|
&__io.address); |
|
if (ret) |
|
goto out; |
|
io = &__io; |
|
} |
|
|
|
file_flags = force_nonblock ? O_NONBLOCK : 0; |
|
|
|
ret = __sys_connect_file(req->file, &io->address, |
|
connect->addr_len, file_flags); |
|
if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) { |
|
if (ret == -EINPROGRESS) { |
|
connect->in_progress = true; |
|
} else { |
|
if (req_has_async_data(req)) |
|
return -EAGAIN; |
|
if (io_alloc_async_data(req)) { |
|
ret = -ENOMEM; |
|
goto out; |
|
} |
|
memcpy(req->async_data, &__io, sizeof(__io)); |
|
} |
|
return -EAGAIN; |
|
} |
|
if (ret == -ERESTARTSYS) |
|
ret = -EINTR; |
|
out: |
|
if (ret < 0) |
|
req_set_fail(req); |
|
io_req_set_res(req, ret, 0); |
|
return IOU_OK; |
|
} |
|
|
|
void io_netmsg_cache_free(struct io_cache_entry *entry) |
|
{ |
|
kfree(container_of(entry, struct io_async_msghdr, cache)); |
|
} |
|
#endif
|
|
|