diff options
Diffstat (limited to 'io_uring/net.c')
| -rw-r--r-- | io_uring/net.c | 1520 |
1 files changed, 1520 insertions, 0 deletions
diff --git a/io_uring/net.c b/io_uring/net.c new file mode 100644 index 000000000..75d494dad --- /dev/null +++ b/io_uring/net.c @@ -0,0 +1,1520 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/file.h> +#include <linux/slab.h> +#include <linux/net.h> +#include <linux/compat.h> +#include <net/compat.h> +#include <linux/io_uring.h> + +#include <uapi/linux/io_uring.h> + +#include "io_uring.h" +#include "kbuf.h" +#include "alloc_cache.h" +#include "net.h" +#include "notif.h" +#include "rsrc.h" + +#if defined(CONFIG_NET) +struct io_shutdown { + struct file *file; + int how; +}; + +struct io_accept { + struct file *file; + struct sockaddr __user *addr; + int __user *addr_len; + int flags; + u32 file_slot; + unsigned long nofile; +}; + +struct io_socket { + struct file *file; + int domain; + int type; + int protocol; + int flags; + u32 file_slot; + unsigned long nofile; +}; + +struct io_connect { + struct file *file; + struct sockaddr __user *addr; + int addr_len; + bool in_progress; + bool seen_econnaborted; +}; + +struct io_sr_msg { + struct file *file; + union { + struct compat_msghdr __user *umsg_compat; + struct user_msghdr __user *umsg; + void __user *buf; + }; + unsigned len; + unsigned done_io; + unsigned msg_flags; + u16 flags; + /* initialised and used only by !msg send variants */ + u16 addr_len; + u16 buf_group; + void __user *addr; + void __user *msg_control; + /* used only for send zerocopy */ + struct io_kiocb *notif; +}; + +static inline bool io_check_multishot(struct io_kiocb *req, + unsigned int issue_flags) +{ + /* + * When ->locked_cq is set we only allow to post CQEs from the original + * task context. Usual request completions will be handled in other + * generic paths but multipoll may decide to post extra cqes. + */ + return !(issue_flags & IO_URING_F_IOWQ) || + !(issue_flags & IO_URING_F_MULTISHOT) || + !req->ctx->task_complete; +} + +int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) +{ + struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); + + if (unlikely(sqe->off || sqe->addr || sqe->rw_flags || + sqe->buf_index || sqe->splice_fd_in)) + return -EINVAL; + + shutdown->how = READ_ONCE(sqe->len); + req->flags |= REQ_F_FORCE_ASYNC; + return 0; +} + +int io_shutdown(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_shutdown *shutdown = io_kiocb_to_cmd(req, struct io_shutdown); + struct socket *sock; + int ret; + + WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK); + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + ret = __sys_shutdown_sock(sock, shutdown->how); + io_req_set_res(req, ret, 0); + return IOU_OK; +} + +static bool io_net_retry(struct socket *sock, int flags) +{ + if (!(flags & MSG_WAITALL)) + return false; + return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET; +} + +static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags) +{ + struct io_async_msghdr *hdr = req->async_data; + + if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED) + return; + + /* Let normal cleanup path reap it if we fail adding to the cache */ + if (io_alloc_cache_put(&req->ctx->netmsg_cache, &hdr->cache)) { + req->async_data = NULL; + req->flags &= ~REQ_F_ASYNC_DATA; + } +} + +static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req, + unsigned int issue_flags) +{ + struct io_ring_ctx *ctx = req->ctx; + struct io_cache_entry *entry; + struct io_async_msghdr *hdr; + + if (!(issue_flags & IO_URING_F_UNLOCKED)) { + entry = io_alloc_cache_get(&ctx->netmsg_cache); + if (entry) { + hdr = container_of(entry, struct io_async_msghdr, cache); + hdr->free_iov = NULL; + req->flags |= REQ_F_ASYNC_DATA; + req->async_data = hdr; + return hdr; + } + } + + if (!io_alloc_async_data(req)) { + hdr = req->async_data; + hdr->free_iov = NULL; + return hdr; + } + return NULL; +} + +static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req) +{ + /* ->prep_async is always called from the submission context */ + return io_msg_alloc_async(req, 0); +} + +static int io_setup_async_msg(struct io_kiocb *req, + struct io_async_msghdr *kmsg, + unsigned int issue_flags) +{ + struct io_async_msghdr *async_msg; + + if (req_has_async_data(req)) + return -EAGAIN; + async_msg = io_msg_alloc_async(req, issue_flags); + if (!async_msg) { + kfree(kmsg->free_iov); + return -ENOMEM; + } + req->flags |= REQ_F_NEED_CLEANUP; + memcpy(async_msg, kmsg, sizeof(*kmsg)); + if (async_msg->msg.msg_name) + async_msg->msg.msg_name = &async_msg->addr; + + if ((req->flags & REQ_F_BUFFER_SELECT) && !async_msg->msg.msg_iter.nr_segs) + return -EAGAIN; + + /* if were using fast_iov, set it to the new one */ + if (iter_is_iovec(&kmsg->msg.msg_iter) && !kmsg->free_iov) { + size_t fast_idx = iter_iov(&kmsg->msg.msg_iter) - kmsg->fast_iov; + async_msg->msg.msg_iter.__iov = &async_msg->fast_iov[fast_idx]; + } + + return -EAGAIN; +} + +static int io_sendmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) +{ + struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); + int ret; + + iomsg->msg.msg_name = &iomsg->addr; + iomsg->free_iov = iomsg->fast_iov; + ret = sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, + &iomsg->free_iov); + /* save msg_control as sys_sendmsg() overwrites it */ + sr->msg_control = iomsg->msg.msg_control_user; + return ret; +} + +int io_send_prep_async(struct io_kiocb *req) +{ + struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg); + struct io_async_msghdr *io; + int ret; + + if (!zc->addr || req_has_async_data(req)) + return 0; + io = io_msg_alloc_async_prep(req); + if (!io) + return -ENOMEM; + ret = move_addr_to_kernel(zc->addr, zc->addr_len, &io->addr); + return ret; +} + +static int io_setup_async_addr(struct io_kiocb *req, + struct sockaddr_storage *addr_storage, + unsigned int issue_flags) +{ + struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); + struct io_async_msghdr *io; + + if (!sr->addr || req_has_async_data(req)) + return -EAGAIN; + io = io_msg_alloc_async(req, issue_flags); + if (!io) + return -ENOMEM; + memcpy(&io->addr, addr_storage, sizeof(io->addr)); + return -EAGAIN; +} + +int io_sendmsg_prep_async(struct io_kiocb *req) +{ + int ret; + + if (!io_msg_alloc_async_prep(req)) + return -ENOMEM; + ret = io_sendmsg_copy_hdr(req, req->async_data); + if (!ret) + req->flags |= REQ_F_NEED_CLEANUP; + return ret; +} + +void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req) +{ + struct io_async_msghdr *io = req->async_data; + + kfree(io->free_iov); +} + +int io_sendmsg_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 (req->opcode == IORING_OP_SEND) { + if (READ_ONCE(sqe->__pad3[0])) + return -EINVAL; + sr->addr = u64_to_user_ptr(READ_ONCE(sqe->addr2)); + sr->addr_len = READ_ONCE(sqe->addr_len); + } else if (sqe->addr2 || sqe->file_index) { + 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 & ~IORING_RECVSEND_POLL_FIRST) + return -EINVAL; + sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL; + if (sr->msg_flags & MSG_DONTWAIT) + req->flags |= REQ_F_NOWAIT; + +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + sr->msg_flags |= MSG_CMSG_COMPAT; +#endif + sr->done_io = 0; + return 0; +} + +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 iomsg, *kmsg; + struct socket *sock; + unsigned flags; + int min_ret = 0; + int ret; + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + if (req_has_async_data(req)) { + kmsg = req->async_data; + kmsg->msg.msg_control_user = sr->msg_control; + } 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; + if (issue_flags & IO_URING_F_NONBLOCK) + flags |= MSG_DONTWAIT; + if (flags & MSG_WAITALL) + min_ret = iov_iter_count(&kmsg->msg.msg_iter); + + ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags); + + if (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)) { + kmsg->msg.msg_controllen = 0; + kmsg->msg.msg_control = NULL; + 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); + req->flags &= ~REQ_F_NEED_CLEANUP; + io_netmsg_recycle(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 sockaddr_storage __address; + struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); + struct msghdr msg; + struct socket *sock; + unsigned flags; + int min_ret = 0; + int ret; + + msg.msg_name = NULL; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_namelen = 0; + msg.msg_ubuf = NULL; + + if (sr->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(sr->addr, sr->addr_len, &__address); + if (unlikely(ret < 0)) + return ret; + msg.msg_name = (struct sockaddr *)&__address; + } + msg.msg_namelen = sr->addr_len; + } + + if (!(req->flags & REQ_F_POLLED) && + (sr->flags & IORING_RECVSEND_POLL_FIRST)) + return io_setup_async_addr(req, &__address, issue_flags); + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &msg.msg_iter); + if (unlikely(ret)) + return ret; + + flags = sr->msg_flags; + if (issue_flags & IO_URING_F_NONBLOCK) + flags |= MSG_DONTWAIT; + if (flags & MSG_WAITALL) + min_ret = iov_iter_count(&msg.msg_iter); + + flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; + msg.msg_flags = flags; + ret = sock_sendmsg(sock, &msg); + if (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, flags)) { + sr->len -= ret; + sr->buf += ret; + sr->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 += sr->done_io; + else if (sr->done_io) + ret = sr->done_io; + io_req_set_res(req, ret, 0); + return IOU_OK; +} + +static bool io_recvmsg_multishot_overflow(struct io_async_msghdr *iomsg) +{ + int hdr; + + if (iomsg->namelen < 0) + return true; + if (check_add_overflow((int)sizeof(struct io_uring_recvmsg_out), + iomsg->namelen, &hdr)) + return true; + if (check_add_overflow(hdr, (int)iomsg->controllen, &hdr)) + return true; + + return false; +} + +static int __io_recvmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) +{ + struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); + struct user_msghdr msg; + int ret; + + if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg))) + return -EFAULT; + + ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); + if (ret) + return ret; + + if (req->flags & REQ_F_BUFFER_SELECT) { + if (msg.msg_iovlen == 0) { + sr->len = iomsg->fast_iov[0].iov_len = 0; + iomsg->fast_iov[0].iov_base = NULL; + iomsg->free_iov = NULL; + } else if (msg.msg_iovlen > 1) { + return -EINVAL; + } else { + if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov))) + return -EFAULT; + sr->len = iomsg->fast_iov[0].iov_len; + iomsg->free_iov = NULL; + } + + if (req->flags & REQ_F_APOLL_MULTISHOT) { + iomsg->namelen = msg.msg_namelen; + iomsg->controllen = msg.msg_controllen; + if (io_recvmsg_multishot_overflow(iomsg)) + return -EOVERFLOW; + } + } else { + iomsg->free_iov = iomsg->fast_iov; + ret = __import_iovec(ITER_DEST, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV, + &iomsg->free_iov, &iomsg->msg.msg_iter, + false); + if (ret > 0) + ret = 0; + } + + return ret; +} + +#ifdef CONFIG_COMPAT +static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) +{ + struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); + struct compat_msghdr msg; + struct compat_iovec __user *uiov; + int ret; + + if (copy_from_user(&msg, sr->umsg_compat, sizeof(msg))) + return -EFAULT; + + ret = __get_compat_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); + if (ret) + return ret; + + uiov = compat_ptr(msg.msg_iov); + if (req->flags & REQ_F_BUFFER_SELECT) { + compat_ssize_t clen; + + iomsg->free_iov = NULL; + if (msg.msg_iovlen == 0) { + sr->len = 0; + } else if (msg.msg_iovlen > 1) { + return -EINVAL; + } else { + if (!access_ok(uiov, sizeof(*uiov))) + return -EFAULT; + if (__get_user(clen, &uiov->iov_len)) + return -EFAULT; + if (clen < 0) + return -EINVAL; + sr->len = clen; + } + + if (req->flags & REQ_F_APOLL_MULTISHOT) { + iomsg->namelen = msg.msg_namelen; + iomsg->controllen = msg.msg_controllen; + if (io_recvmsg_multishot_overflow(iomsg)) + return -EOVERFLOW; + } + } else { + iomsg->free_iov = iomsg->fast_iov; + ret = __import_iovec(ITER_DEST, (struct iovec __user *)uiov, msg.msg_iovlen, + UIO_FASTIOV, &iomsg->free_iov, + &iomsg->msg.msg_iter, true); + if (ret < 0) + return ret; + } + + return 0; +} +#endif + +static int io_recvmsg_copy_hdr(struct io_kiocb *req, + struct io_async_msghdr *iomsg) +{ + iomsg->msg.msg_name = &iomsg->addr; + iomsg->msg.msg_iter.nr_segs = 0; + +#ifdef CONFIG_COMPAT + if (req->ctx->compat) + return __io_compat_recvmsg_copy_hdr(req, iomsg); +#endif + + return __io_recvmsg_copy_hdr(req, iomsg); +} + +int io_recvmsg_prep_async(struct io_kiocb *req) +{ + int ret; + + 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); + 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; + /* + * 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; + } + +#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 */ + req->buf_index = sr->buf_group; +} + +/* + * 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 msghdr *msg, bool mshot_finished, + unsigned issue_flags) +{ + unsigned int cflags; + + cflags = io_put_kbuf(req, issue_flags); + if (msg->msg_inq && msg->msg_inq != -1) + cflags |= IORING_CQE_F_SOCK_NONEMPTY; + + if (!(req->flags & REQ_F_APOLL_MULTISHOT)) { + io_req_set_res(req, *ret, cflags); + *ret = IOU_OK; + return true; + } + + if (!mshot_finished) { + if (io_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER, + *ret, cflags | IORING_CQE_F_MORE)) { + io_recv_prep_retry(req); + /* Known not-empty or unknown state, retry */ + if (cflags & IORING_CQE_F_SOCK_NONEMPTY || + msg->msg_inq == -1) + return false; + if (issue_flags & IO_URING_F_MULTISHOT) + *ret = IOU_ISSUE_SKIP_COMPLETE; + else + *ret = -EAGAIN; + return true; + } + /* Otherwise stop multishot but use the current result. */ + } + + 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 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); + + if (!io_check_multishot(req, issue_flags)) + 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; + } + } + + iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len); + } + + flags = sr->msg_flags; + if (force_nonblock) + flags |= MSG_DONTWAIT; + + 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) { + 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); + + if (!io_recv_finish(req, &ret, &kmsg->msg, mshot_finished, issue_flags)) + goto retry_multishot; + + if (mshot_finished) { + /* fast path, check for non-NULL to avoid function call */ + if (kmsg->free_iov) + kfree(kmsg->free_iov); + io_netmsg_recycle(req, issue_flags); + 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; + 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; + + if (!io_check_multishot(req, issue_flags)) + return -EAGAIN; + + sock = sock_from_file(req->file); + if (unlikely(!sock)) + return -ENOTSOCK; + + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_control = NULL; + msg.msg_get_inq = 1; + msg.msg_controllen = 0; + msg.msg_iocb = NULL; + msg.msg_ubuf = NULL; + +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_ubuf(ITER_DEST, sr->buf, len, &msg.msg_iter); + if (unlikely(ret)) + goto out_free; + + msg.msg_inq = -1; + msg.msg_flags = 0; + + 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); + + if (!io_recv_finish(req, &ret, &msg, 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; + } +} + +#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; + + 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) { + io_notif_set_extended(notif); + io_notif_to_data(notif)->zc_report = true; + } + } + + 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 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(ITER_SOURCE, &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 { + io_notif_set_extended(zc->notif); + ret = import_ubuf(ITER_SOURCE, zc->buf, zc->len, &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_flags &= ~MSG_INTERNAL_SENDMSG_FLAGS; + + 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; + + io_notif_set_extended(sr->notif); + + 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_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; + + if (!io_check_multishot(req, issue_flags)) + return -EAGAIN; +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) + return ret; + if (io_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER, + ret, IORING_CQE_F_MORE)) + goto retry; + + return -ECANCELED; +} + +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 = conn->seen_econnaborted = 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 (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 || 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; + } + 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 (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_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 |