// 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; /* 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 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 = kmsg->msg.msg_iter.iov - 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); iomsg->msg.msg_name = &iomsg->addr; iomsg->free_iov = iomsg->fast_iov; return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags, &iomsg->free_iov); } 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; } 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)) { 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); 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; #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, 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_aux_cqe(req->ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, req->cqe.user_data, *ret, cflags | IORING_CQE_F_MORE, true)) { io_recv_prep_retry(req); return false; } /* 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 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); 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; 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) { /* 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 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; if (!io_check_multishot(req, issue_flags)) 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_ubuf(ITER_DEST, sr->buf, len, &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; } } #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.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_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; 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_aux_cqe(ctx, issue_flags & IO_URING_F_COMPLETE_DEFER, req->cqe.user_data, ret, IORING_CQE_F_MORE, true)) 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 (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 || ret == -ECONNABORTED) && force_nonblock) { if (ret == -EINPROGRESS) { connect->in_progress = true; return -EAGAIN; } 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 (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