| // 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; |
| unsigned nr_multishot_loops; |
| 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; |
| }; |
| |
| /* |
| * Number of times we'll try and do receives if there's more data. If we |
| * exceed this limit, then add us to the back of the queue and retry from |
| * there. This helps fairness between flooding clients. |
| */ |
| #define MULTISHOT_MAX_RETRY 32 |
| |
| 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; |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static int io_compat_msg_copy_hdr(struct io_kiocb *req, |
| struct io_async_msghdr *iomsg, |
| struct compat_msghdr *msg, int ddir) |
| { |
| struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| struct compat_iovec __user *uiov; |
| int ret; |
| |
| if (copy_from_user(msg, sr->umsg_compat, sizeof(*msg))) |
| return -EFAULT; |
| |
| 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; |
| } |
| |
| return 0; |
| } |
| |
| iomsg->free_iov = iomsg->fast_iov; |
| ret = __import_iovec(ddir, (struct iovec __user *)uiov, msg->msg_iovlen, |
| UIO_FASTIOV, &iomsg->free_iov, |
| &iomsg->msg.msg_iter, true); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| return 0; |
| } |
| #endif |
| |
| static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg, |
| struct user_msghdr *msg, int ddir) |
| { |
| struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| int ret; |
| |
| if (!user_access_begin(sr->umsg, sizeof(*sr->umsg))) |
| return -EFAULT; |
| |
| ret = -EFAULT; |
| unsafe_get_user(msg->msg_name, &sr->umsg->msg_name, ua_end); |
| unsafe_get_user(msg->msg_namelen, &sr->umsg->msg_namelen, ua_end); |
| unsafe_get_user(msg->msg_iov, &sr->umsg->msg_iov, ua_end); |
| unsafe_get_user(msg->msg_iovlen, &sr->umsg->msg_iovlen, ua_end); |
| unsafe_get_user(msg->msg_control, &sr->umsg->msg_control, ua_end); |
| unsafe_get_user(msg->msg_controllen, &sr->umsg->msg_controllen, ua_end); |
| msg->msg_flags = 0; |
| |
| 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) { |
| ret = -EINVAL; |
| goto ua_end; |
| } else { |
| /* we only need the length for provided buffers */ |
| if (!access_ok(&msg->msg_iov[0].iov_len, sizeof(__kernel_size_t))) |
| goto ua_end; |
| unsafe_get_user(iomsg->fast_iov[0].iov_len, |
| &msg->msg_iov[0].iov_len, ua_end); |
| sr->len = iomsg->fast_iov[0].iov_len; |
| iomsg->free_iov = NULL; |
| } |
| ret = 0; |
| ua_end: |
| user_access_end(); |
| return ret; |
| } |
| |
| user_access_end(); |
| iomsg->free_iov = iomsg->fast_iov; |
| ret = __import_iovec(ddir, msg->msg_iov, msg->msg_iovlen, UIO_FASTIOV, |
| &iomsg->free_iov, &iomsg->msg.msg_iter, false); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| return 0; |
| } |
| |
| 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); |
| struct user_msghdr msg; |
| int ret; |
| |
| iomsg->msg.msg_name = &iomsg->addr; |
| iomsg->msg.msg_iter.nr_segs = 0; |
| |
| #ifdef CONFIG_COMPAT |
| if (unlikely(req->ctx->compat)) { |
| struct compat_msghdr cmsg; |
| |
| ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_SOURCE); |
| if (unlikely(ret)) |
| return ret; |
| |
| return __get_compat_msghdr(&iomsg->msg, &cmsg, NULL); |
| } |
| #endif |
| |
| ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_SOURCE); |
| if (unlikely(ret)) |
| return ret; |
| |
| ret = __copy_msghdr(&iomsg->msg, &msg, NULL); |
| |
| /* 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); |
| |
| sr->done_io = 0; |
| |
| 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 |
| return 0; |
| } |
| |
| static void io_req_msg_cleanup(struct io_kiocb *req, |
| struct io_async_msghdr *kmsg, |
| unsigned int issue_flags) |
| { |
| req->flags &= ~REQ_F_NEED_CLEANUP; |
| /* fast path, check for non-NULL to avoid function call */ |
| if (kmsg->free_iov) |
| kfree(kmsg->free_iov); |
| io_netmsg_recycle(req, issue_flags); |
| } |
| |
| 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_BL_NO_RECYCLE; |
| return io_setup_async_msg(req, kmsg, issue_flags); |
| } |
| if (ret == -ERESTARTSYS) |
| ret = -EINTR; |
| req_set_fail(req); |
| } |
| io_req_msg_cleanup(req, kmsg, 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_BL_NO_RECYCLE; |
| 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 int io_recvmsg_mshot_prep(struct io_kiocb *req, |
| struct io_async_msghdr *iomsg, |
| int namelen, size_t controllen) |
| { |
| if ((req->flags & (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) == |
| (REQ_F_APOLL_MULTISHOT|REQ_F_BUFFER_SELECT)) { |
| int hdr; |
| |
| if (unlikely(namelen < 0)) |
| return -EOVERFLOW; |
| if (check_add_overflow(sizeof(struct io_uring_recvmsg_out), |
| namelen, &hdr)) |
| return -EOVERFLOW; |
| if (check_add_overflow(hdr, controllen, &hdr)) |
| return -EOVERFLOW; |
| |
| iomsg->namelen = namelen; |
| iomsg->controllen = controllen; |
| return 0; |
| } |
| |
| return 0; |
| } |
| |
| static int io_recvmsg_copy_hdr(struct io_kiocb *req, |
| struct io_async_msghdr *iomsg) |
| { |
| struct user_msghdr msg; |
| int ret; |
| |
| iomsg->msg.msg_name = &iomsg->addr; |
| iomsg->msg.msg_iter.nr_segs = 0; |
| |
| #ifdef CONFIG_COMPAT |
| if (unlikely(req->ctx->compat)) { |
| struct compat_msghdr cmsg; |
| |
| ret = io_compat_msg_copy_hdr(req, iomsg, &cmsg, ITER_DEST); |
| if (unlikely(ret)) |
| return ret; |
| |
| ret = __get_compat_msghdr(&iomsg->msg, &cmsg, &iomsg->uaddr); |
| if (unlikely(ret)) |
| return ret; |
| |
| return io_recvmsg_mshot_prep(req, iomsg, cmsg.msg_namelen, |
| cmsg.msg_controllen); |
| } |
| #endif |
| |
| ret = io_msg_copy_hdr(req, iomsg, &msg, ITER_DEST); |
| if (unlikely(ret)) |
| return ret; |
| |
| ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr); |
| if (unlikely(ret)) |
| return ret; |
| |
| return io_recvmsg_mshot_prep(req, iomsg, msg.msg_namelen, |
| msg.msg_controllen); |
| } |
| |
| int io_recvmsg_prep_async(struct io_kiocb *req) |
| { |
| struct io_async_msghdr *iomsg; |
| int ret; |
| |
| if (!io_msg_alloc_async_prep(req)) |
| return -ENOMEM; |
| iomsg = req->async_data; |
| ret = io_recvmsg_copy_hdr(req, iomsg); |
| 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); |
| |
| sr->done_io = 0; |
| |
| if (unlikely(sqe->file_index || sqe->addr2)) |
| return -EINVAL; |
| |
| sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr)); |
| sr->len = READ_ONCE(sqe->len); |
| sr->flags = READ_ONCE(sqe->ioprio); |
| if (sr->flags & ~(RECVMSG_FLAGS)) |
| return -EINVAL; |
| sr->msg_flags = READ_ONCE(sqe->msg_flags); |
| if (sr->msg_flags & MSG_DONTWAIT) |
| req->flags |= REQ_F_NOWAIT; |
| if (sr->msg_flags & MSG_ERRQUEUE) |
| req->flags |= REQ_F_CLEAR_POLLIN; |
| if (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->nr_multishot_loops = 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); |
| |
| req->flags &= ~REQ_F_BL_EMPTY; |
| 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 > 0) |
| cflags |= IORING_CQE_F_SOCK_NONEMPTY; |
| |
| /* |
| * Fill CQE for this receive and see if we should keep trying to |
| * receive from this socket. |
| */ |
| if ((req->flags & REQ_F_APOLL_MULTISHOT) && !mshot_finished && |
| io_fill_cqe_req_aux(req, issue_flags & IO_URING_F_COMPLETE_DEFER, |
| *ret, cflags | IORING_CQE_F_MORE)) { |
| struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg); |
| int mshot_retry_ret = IOU_ISSUE_SKIP_COMPLETE; |
| |
| io_recv_prep_retry(req); |
| /* Known not-empty or unknown state, retry */ |
| if (cflags & IORING_CQE_F_SOCK_NONEMPTY || msg->msg_inq < 0) { |
| if (sr->nr_multishot_loops++ < MULTISHOT_MAX_RETRY) |
| return false; |
| /* mshot retries exceeded, force a requeue */ |
| sr->nr_multishot_loops = 0; |
| mshot_retry_ret = IOU_REQUEUE; |
| } |
| if (issue_flags & IO_URING_F_MULTISHOT) |
| *ret = mshot_retry_ret; |
| else |
| *ret = -EAGAIN; |
| return true; |
| } |
| |
| /* Finish the request / stop multishot. */ |
| 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); |
| |
| flags = sr->msg_flags; |
| if (force_nonblock) |
| flags |= MSG_DONTWAIT; |
| |
| retry_multishot: |
| if (io_do_buffer_select(req)) { |
| void __user *buf; |
| size_t len = sr->len; |
| |
| buf = io_buffer_select(req, &len, issue_flags); |
| if (!buf) |
| return -ENOBUFS; |
| |
| if (req->flags & REQ_F_APOLL_MULTISHOT) { |
| ret = io_recvmsg_prep_multishot(kmsg, sr, &buf, &len); |
| if (ret) { |
| io_kbuf_recycle(req, issue_flags); |
| return ret; |
| } |
| } |
| |
| iov_iter_ubuf(&kmsg->msg.msg_iter, ITER_DEST, buf, len); |
| } |
| |
| kmsg->msg.msg_get_inq = 1; |
| kmsg->msg.msg_inq = -1; |
| if (req->flags & REQ_F_APOLL_MULTISHOT) { |
| ret = io_recvmsg_multishot(sock, sr, kmsg, flags, |
| &mshot_finished); |
| } else { |
| /* disable partial retry for recvmsg with cmsg attached */ |
| if (flags & MSG_WAITALL && !kmsg->msg.msg_controllen) |
| min_ret = iov_iter_count(&kmsg->msg.msg_iter); |
| |
| ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg, |
| kmsg->uaddr, flags); |
| } |
| |
| if (ret < min_ret) { |
| if (ret == -EAGAIN && force_nonblock) { |
| 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_BL_NO_RECYCLE; |
| 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) |
| io_req_msg_cleanup(req, kmsg, issue_flags); |
| else if (ret == -EAGAIN) |
| return io_setup_async_msg(req, kmsg, issue_flags); |
| |
| 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; |
| |
| 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; |
| |
| flags = sr->msg_flags; |
| if (force_nonblock) |
| flags |= MSG_DONTWAIT; |
| |
| 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; |
| sr->len = len; |
| } |
| |
| 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; |
| |
| 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_BL_NO_RECYCLE; |
| 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; |
| |
| zc->done_io = 0; |
| |
| 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; |
| |
| #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_BL_NO_RECYCLE; |
| 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_BL_NO_RECYCLE; |
| 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 (sr->done_io) |
| req->cqe.res = sr->done_io; |
| |
| if ((req->flags & REQ_F_NEED_CLEANUP) && |
| (req->opcode == IORING_OP_SEND_ZC || req->opcode == IORING_OP_SENDMSG_ZC)) |
| req->cqe.flags |= IORING_CQE_F_MORE; |
| } |
| |
| 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; |
| |
| 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) |
| return IOU_ISSUE_SKIP_COMPLETE; |
| return ret; |
| } |
| if (ret == -ERESTARTSYS) |
| ret = -EINTR; |
| req_set_fail(req); |
| } else if (!fixed) { |
| fd_install(fd, file); |
| ret = fd; |
| } else { |
| ret = io_fixed_fd_install(req, issue_flags, file, |
| accept->file_slot); |
| } |
| |
| 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; |
| |
| io_req_set_res(req, ret, 0); |
| return IOU_STOP_MULTISHOT; |
| } |
| |
| int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) |
| { |
| struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
| |
| if (sqe->addr || sqe->rw_flags || sqe->buf_index) |
| return -EINVAL; |
| |
| sock->domain = READ_ONCE(sqe->fd); |
| sock->type = READ_ONCE(sqe->off); |
| sock->protocol = READ_ONCE(sqe->len); |
| sock->file_slot = READ_ONCE(sqe->file_index); |
| sock->nofile = rlimit(RLIMIT_NOFILE); |
| |
| sock->flags = sock->type & ~SOCK_TYPE_MASK; |
| if (sock->file_slot && (sock->flags & SOCK_CLOEXEC)) |
| return -EINVAL; |
| if (sock->flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK)) |
| return -EINVAL; |
| return 0; |
| } |
| |
| int io_socket(struct io_kiocb *req, unsigned int issue_flags) |
| { |
| struct io_socket *sock = io_kiocb_to_cmd(req, struct io_socket); |
| bool fixed = !!sock->file_slot; |
| struct file *file; |
| int ret, fd; |
| |
| if (!fixed) { |
| fd = __get_unused_fd_flags(sock->flags, sock->nofile); |
| if (unlikely(fd < 0)) |
| return fd; |
| } |
| file = __sys_socket_file(sock->domain, sock->type, sock->protocol); |
| if (IS_ERR(file)) { |
| if (!fixed) |
| put_unused_fd(fd); |
| ret = PTR_ERR(file); |
| if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK)) |
| return -EAGAIN; |
| if (ret == -ERESTARTSYS) |
| ret = -EINTR; |
| req_set_fail(req); |
| } else if (!fixed) { |
| fd_install(fd, file); |
| ret = fd; |
| } else { |
| ret = io_fixed_fd_install(req, issue_flags, file, |
| sock->file_slot); |
| } |
| io_req_set_res(req, ret, 0); |
| return IOU_OK; |
| } |
| |
| int io_connect_prep_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 |