1 files changed, 513 insertions, 362 deletions

diff --git a/io_uring/net.c b/io_uring/net.c
index 1e7665ff6ef7..0a48596429d9 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -28,6 +28,7 @@ struct io_accept {
 	struct sockaddr __user		*addr;
 	int __user			*addr_len;
 	int				flags;
+	int				iou_flags;
 	u32				file_slot;
 	unsigned long			nofile;
 };
@@ -57,7 +58,7 @@ struct io_sr_msg {
 		struct user_msghdr __user	*umsg;
 		void __user			*buf;
 	};
-	unsigned			len;
+	int				len;
 	unsigned			done_io;
 	unsigned			msg_flags;
 	unsigned			nr_multishot_loops;
@@ -115,80 +116,85 @@ static bool io_net_retry(struct socket *sock, int flags)
 	return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET;
 }
 
+static void io_netmsg_iovec_free(struct io_async_msghdr *kmsg)
+{
+	if (kmsg->free_iov) {
+		kfree(kmsg->free_iov);
+		kmsg->free_iov_nr = 0;
+		kmsg->free_iov = NULL;
+	}
+}
+
 static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_async_msghdr *hdr = req->async_data;
+	struct iovec *iov;
 
-	if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED)
+	/* can't recycle, ensure we free the iovec if we have one */
+	if (unlikely(issue_flags & IO_URING_F_UNLOCKED)) {
+		io_netmsg_iovec_free(hdr);
 		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)) {
+	iov = hdr->free_iov;
+	if (io_alloc_cache_put(&req->ctx->netmsg_cache, hdr)) {
+		if (iov)
+			kasan_mempool_poison_object(iov);
 		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)
+static struct io_async_msghdr *io_msg_alloc_async(struct io_kiocb *req)
 {
 	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;
+	hdr = io_alloc_cache_get(&ctx->netmsg_cache);
+	if (hdr) {
+		if (hdr->free_iov) {
+			kasan_mempool_unpoison_object(hdr->free_iov,
+				hdr->free_iov_nr * sizeof(struct iovec));
+			req->flags |= REQ_F_NEED_CLEANUP;
 		}
+		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_nr = 0;
 		hdr->free_iov = NULL;
 		return hdr;
 	}
 	return NULL;
 }
 
-static inline struct io_async_msghdr *io_msg_alloc_async_prep(struct io_kiocb *req)
+/* assign new iovec to kmsg, if we need to */
+static int io_net_vec_assign(struct io_kiocb *req, struct io_async_msghdr *kmsg,
+			     struct iovec *iov)
 {
-	/* ->prep_async is always called from the submission context */
-	return io_msg_alloc_async(req, 0);
+	if (iov) {
+		req->flags |= REQ_F_NEED_CLEANUP;
+		kmsg->free_iov_nr = kmsg->msg.msg_iter.nr_segs;
+		if (kmsg->free_iov)
+			kfree(kmsg->free_iov);
+		kmsg->free_iov = iov;
+	}
+	return 0;
 }
 
-static int io_setup_async_msg(struct io_kiocb *req,
-			      struct io_async_msghdr *kmsg,
-			      unsigned int issue_flags)
+static inline void io_mshot_prep_retry(struct io_kiocb *req,
+				       struct io_async_msghdr *kmsg)
 {
-	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];
-	}
+	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
 
-	return -EAGAIN;
+	req->flags &= ~REQ_F_BL_EMPTY;
+	sr->done_io = 0;
+	sr->len = 0; /* get from the provided buffer */
+	req->buf_index = sr->buf_group;
 }
 
 #ifdef CONFIG_COMPAT
@@ -198,7 +204,16 @@ static int io_compat_msg_copy_hdr(struct io_kiocb *req,
 {
 	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
 	struct compat_iovec __user *uiov;
-	int ret;
+	struct iovec *iov;
+	int ret, nr_segs;
+
+	if (iomsg->free_iov) {
+		nr_segs = iomsg->free_iov_nr;
+		iov = iomsg->free_iov;
+	} else {
+		iov = &iomsg->fast_iov;
+		nr_segs = 1;
+	}
 
 	if (copy_from_user(msg, sr->umsg_compat, sizeof(*msg)))
 		return -EFAULT;
@@ -207,9 +222,9 @@ static int io_compat_msg_copy_hdr(struct io_kiocb *req,
 	if (req->flags & REQ_F_BUFFER_SELECT) {
 		compat_ssize_t clen;
 
-		iomsg->free_iov = NULL;
 		if (msg->msg_iovlen == 0) {
-			sr->len = 0;
+			sr->len = iov->iov_len = 0;
+			iov->iov_base = NULL;
 		} else if (msg->msg_iovlen > 1) {
 			return -EINVAL;
 		} else {
@@ -225,14 +240,12 @@ static int io_compat_msg_copy_hdr(struct io_kiocb *req,
 		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);
+				nr_segs, &iov, &iomsg->msg.msg_iter, true);
 	if (unlikely(ret < 0))
 		return ret;
 
-	return 0;
+	return io_net_vec_assign(req, iomsg, iov);
 }
 #endif
 
@@ -240,7 +253,16 @@ 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;
+	struct iovec *iov;
+	int ret, nr_segs;
+
+	if (iomsg->free_iov) {
+		nr_segs = iomsg->free_iov_nr;
+		iov = iomsg->free_iov;
+	} else {
+		iov = &iomsg->fast_iov;
+		nr_segs = 1;
+	}
 
 	if (!user_access_begin(sr->umsg, sizeof(*sr->umsg)))
 		return -EFAULT;
@@ -256,9 +278,8 @@ static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg,
 
 	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;
+			sr->len = iov->iov_len = 0;
+			iov->iov_base = NULL;
 		} else if (msg->msg_iovlen > 1) {
 			ret = -EINVAL;
 			goto ua_end;
@@ -266,10 +287,9 @@ static int io_msg_copy_hdr(struct io_kiocb *req, struct io_async_msghdr *iomsg,
 			/* 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;
+			unsafe_get_user(iov->iov_len, &msg->msg_iov[0].iov_len,
+					ua_end);
+			sr->len = iov->iov_len;
 		}
 		ret = 0;
 ua_end:
@@ -278,13 +298,12 @@ ua_end:
 	}
 
 	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);
+	ret = __import_iovec(ddir, msg->msg_iov, msg->msg_iovlen, nr_segs,
+				&iov, &iomsg->msg.msg_iter, false);
 	if (unlikely(ret < 0))
 		return ret;
 
-	return 0;
+	return io_net_vec_assign(req, iomsg, iov);
 }
 
 static int io_sendmsg_copy_hdr(struct io_kiocb *req,
@@ -320,60 +339,58 @@ static int io_sendmsg_copy_hdr(struct io_kiocb *req,
 	return ret;
 }
 
-int io_send_prep_async(struct io_kiocb *req)
+void io_sendmsg_recvmsg_cleanup(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;
+	struct io_async_msghdr *io = req->async_data;
 
-	if (req_has_async_data(req))
-		return 0;
-	zc->done_io = 0;
-	if (!zc->addr)
-		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;
+	io_netmsg_iovec_free(io);
 }
 
-static int io_setup_async_addr(struct io_kiocb *req,
-			      struct sockaddr_storage *addr_storage,
-			      unsigned int issue_flags)
+static int io_send_setup(struct io_kiocb *req)
 {
 	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
-	struct io_async_msghdr *io;
+	struct io_async_msghdr *kmsg = req->async_data;
+	int ret;
 
-	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;
+	kmsg->msg.msg_name = NULL;
+	kmsg->msg.msg_namelen = 0;
+	kmsg->msg.msg_control = NULL;
+	kmsg->msg.msg_controllen = 0;
+	kmsg->msg.msg_ubuf = NULL;
+
+	if (sr->addr) {
+		ret = move_addr_to_kernel(sr->addr, sr->addr_len, &kmsg->addr);
+		if (unlikely(ret < 0))
+			return ret;
+		kmsg->msg.msg_name = &kmsg->addr;
+		kmsg->msg.msg_namelen = sr->addr_len;
+	}
+	if (!io_do_buffer_select(req)) {
+		ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len,
+				  &kmsg->msg.msg_iter);
+		if (unlikely(ret < 0))
+			return ret;
+	}
+	return 0;
 }
 
-int io_sendmsg_prep_async(struct io_kiocb *req)
+static int io_sendmsg_prep_setup(struct io_kiocb *req, int is_msg)
 {
-	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
+	struct io_async_msghdr *kmsg;
 	int ret;
 
-	sr->done_io = 0;
-	if (!io_msg_alloc_async_prep(req))
+	kmsg = io_msg_alloc_async(req);
+	if (unlikely(!kmsg))
 		return -ENOMEM;
-	ret = io_sendmsg_copy_hdr(req, req->async_data);
+	if (!is_msg)
+		return io_send_setup(req);
+	ret = io_sendmsg_copy_hdr(req, kmsg);
 	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);
-}
+#define SENDMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECVSEND_BUNDLE)
 
 int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
@@ -393,34 +410,114 @@ int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	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)
+	if (sr->flags & ~SENDMSG_FLAGS)
 		return -EINVAL;
 	sr->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL;
 	if (sr->msg_flags & MSG_DONTWAIT)
 		req->flags |= REQ_F_NOWAIT;
+	if (sr->flags & IORING_RECVSEND_BUNDLE) {
+		if (req->opcode == IORING_OP_SENDMSG)
+			return -EINVAL;
+		if (!(req->flags & REQ_F_BUFFER_SELECT))
+			return -EINVAL;
+		sr->msg_flags |= MSG_WAITALL;
+		sr->buf_group = req->buf_index;
+		req->buf_list = NULL;
+	}
+	if (req->flags & REQ_F_BUFFER_SELECT && sr->len)
+		return -EINVAL;
 
 #ifdef CONFIG_COMPAT
 	if (req->ctx->compat)
 		sr->msg_flags |= MSG_CMSG_COMPAT;
 #endif
-	return 0;
+	return io_sendmsg_prep_setup(req, req->opcode == IORING_OP_SENDMSG);
 }
 
 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);
 }
 
+/*
+ * For bundle completions, we need to figure out how many segments we consumed.
+ * A bundle could be using a single ITER_UBUF if that's all we mapped, or it
+ * could be using an ITER_IOVEC. If the latter, then if we consumed all of
+ * the segments, then it's a trivial questiont o answer. If we have residual
+ * data in the iter, then loop the segments to figure out how much we
+ * transferred.
+ */
+static int io_bundle_nbufs(struct io_async_msghdr *kmsg, int ret)
+{
+	struct iovec *iov;
+	int nbufs;
+
+	/* no data is always zero segments, and a ubuf is always 1 segment */
+	if (ret <= 0)
+		return 0;
+	if (iter_is_ubuf(&kmsg->msg.msg_iter))
+		return 1;
+
+	iov = kmsg->free_iov;
+	if (!iov)
+		iov = &kmsg->fast_iov;
+
+	/* if all data was transferred, it's basic pointer math */
+	if (!iov_iter_count(&kmsg->msg.msg_iter))
+		return iter_iov(&kmsg->msg.msg_iter) - iov;
+
+	/* short transfer, count segments */
+	nbufs = 0;
+	do {
+		int this_len = min_t(int, iov[nbufs].iov_len, ret);
+
+		nbufs++;
+		ret -= this_len;
+	} while (ret);
+
+	return nbufs;
+}
+
+static inline bool io_send_finish(struct io_kiocb *req, int *ret,
+				  struct io_async_msghdr *kmsg,
+				  unsigned issue_flags)
+{
+	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
+	bool bundle_finished = *ret <= 0;
+	unsigned int cflags;
+
+	if (!(sr->flags & IORING_RECVSEND_BUNDLE)) {
+		cflags = io_put_kbuf(req, issue_flags);
+		goto finish;
+	}
+
+	cflags = io_put_kbufs(req, io_bundle_nbufs(kmsg, *ret), issue_flags);
+
+	if (bundle_finished || req->flags & REQ_F_BL_EMPTY)
+		goto finish;
+
+	/*
+	 * Fill CQE for this receive and see if we should keep trying to
+	 * receive from this socket.
+	 */
+	if (io_req_post_cqe(req, *ret, cflags | IORING_CQE_F_MORE)) {
+		io_mshot_prep_retry(req, kmsg);
+		return false;
+	}
+
+	/* Otherwise stop bundle and use the current result. */
+finish:
+	io_req_set_res(req, *ret, cflags);
+	*ret = IOU_OK;
+	return true;
+}
+
 int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
-	struct io_async_msghdr iomsg, *kmsg;
+	struct io_async_msghdr *kmsg = req->async_data;
 	struct socket *sock;
 	unsigned flags;
 	int min_ret = 0;
@@ -430,19 +527,9 @@ int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 	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);
+		return -EAGAIN;
 
 	flags = sr->msg_flags;
 	if (issue_flags & IO_URING_F_NONBLOCK)
@@ -450,23 +537,25 @@ int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 	if (flags & MSG_WAITALL)
 		min_ret = iov_iter_count(&kmsg->msg.msg_iter);
 
+	kmsg->msg.msg_control_user = sr->msg_control;
+
 	ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
 
 	if (ret < min_ret) {
 		if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
-			return io_setup_async_msg(req, kmsg, issue_flags);
+			return -EAGAIN;
 		if (ret > 0 && io_net_retry(sock, flags)) {
 			kmsg->msg.msg_controllen = 0;
 			kmsg->msg.msg_control = NULL;
 			sr->done_io += ret;
 			req->flags |= REQ_F_BL_NO_RECYCLE;
-			return io_setup_async_msg(req, kmsg, issue_flags);
+			return -EAGAIN;
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
 		req_set_fail(req);
 	}
-	io_req_msg_cleanup(req, kmsg, issue_flags);
+	io_req_msg_cleanup(req, issue_flags);
 	if (ret >= 0)
 		ret += sr->done_io;
 	else if (sr->done_io)
@@ -477,65 +566,77 @@ int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 
 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 io_async_msghdr *kmsg = req->async_data;
 	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;
+	if (!(req->flags & REQ_F_POLLED) &&
+	    (sr->flags & IORING_RECVSEND_POLL_FIRST))
+		return -EAGAIN;
 
 	flags = sr->msg_flags;
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		flags |= MSG_DONTWAIT;
-	if (flags & MSG_WAITALL)
-		min_ret = iov_iter_count(&msg.msg_iter);
+
+retry_bundle:
+	if (io_do_buffer_select(req)) {
+		struct buf_sel_arg arg = {
+			.iovs = &kmsg->fast_iov,
+			.max_len = INT_MAX,
+			.nr_iovs = 1,
+			.mode = KBUF_MODE_EXPAND,
+		};
+
+		if (kmsg->free_iov) {
+			arg.nr_iovs = kmsg->free_iov_nr;
+			arg.iovs = kmsg->free_iov;
+			arg.mode |= KBUF_MODE_FREE;
+		}
+
+		if (!(sr->flags & IORING_RECVSEND_BUNDLE))
+			arg.nr_iovs = 1;
+
+		ret = io_buffers_select(req, &arg, issue_flags);
+		if (unlikely(ret < 0))
+			return ret;
+
+		sr->len = arg.out_len;
+		iov_iter_init(&kmsg->msg.msg_iter, ITER_SOURCE, arg.iovs, ret,
+				arg.out_len);
+		if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
+			kmsg->free_iov_nr = ret;
+			kmsg->free_iov = arg.iovs;
+		}
+	}
+
+	/*
+	 * If MSG_WAITALL is set, or this is a bundle send, then we need
+	 * the full amount. If just bundle is set, if we do a short send
+	 * then we complete the bundle sequence rather than continue on.
+	 */
+	if (flags & MSG_WAITALL || sr->flags & IORING_RECVSEND_BUNDLE)
+		min_ret = iov_iter_count(&kmsg->msg.msg_iter);
 
 	flags &= ~MSG_INTERNAL_SENDMSG_FLAGS;
-	msg.msg_flags = flags;
-	ret = sock_sendmsg(sock, &msg);
+	kmsg->msg.msg_flags = flags;
+	ret = sock_sendmsg(sock, &kmsg->msg);
 	if (ret < min_ret) {
 		if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
-			return io_setup_async_addr(req, &__address, issue_flags);
+			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 io_setup_async_addr(req, &__address, issue_flags);
+			return -EAGAIN;
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
@@ -545,8 +646,12 @@ int io_send(struct io_kiocb *req, unsigned int issue_flags)
 		ret += sr->done_io;
 	else if (sr->done_io)
 		ret = sr->done_io;
-	io_req_set_res(req, ret, 0);
-	return IOU_OK;
+
+	if (!io_send_finish(req, &ret, kmsg, issue_flags))
+		goto retry_bundle;
+
+	io_req_msg_cleanup(req, issue_flags);
+	return ret;
 }
 
 static int io_recvmsg_mshot_prep(struct io_kiocb *req,
@@ -611,23 +716,42 @@ static int io_recvmsg_copy_hdr(struct io_kiocb *req,
 					msg.msg_controllen);
 }
 
-int io_recvmsg_prep_async(struct io_kiocb *req)
+static int io_recvmsg_prep_setup(struct io_kiocb *req)
 {
 	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
-	struct io_async_msghdr *iomsg;
+	struct io_async_msghdr *kmsg;
 	int ret;
 
-	sr->done_io = 0;
-	if (!io_msg_alloc_async_prep(req))
+	kmsg = io_msg_alloc_async(req);
+	if (unlikely(!kmsg))
 		return -ENOMEM;
-	iomsg = req->async_data;
-	ret = io_recvmsg_copy_hdr(req, iomsg);
+
+	if (req->opcode == IORING_OP_RECV) {
+		kmsg->msg.msg_name = NULL;
+		kmsg->msg.msg_namelen = 0;
+		kmsg->msg.msg_control = NULL;
+		kmsg->msg.msg_get_inq = 1;
+		kmsg->msg.msg_controllen = 0;
+		kmsg->msg.msg_iocb = NULL;
+		kmsg->msg.msg_ubuf = NULL;
+
+		if (!io_do_buffer_select(req)) {
+			ret = import_ubuf(ITER_DEST, sr->buf, sr->len,
+					  &kmsg->msg.msg_iter);
+			if (unlikely(ret))
+				return ret;
+		}
+		return 0;
+	}
+
+	ret = io_recvmsg_copy_hdr(req, kmsg);
 	if (!ret)
 		req->flags |= REQ_F_NEED_CLEANUP;
 	return ret;
 }
 
-#define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT)
+#define RECVMSG_FLAGS (IORING_RECVSEND_POLL_FIRST | IORING_RECV_MULTISHOT | \
+			IORING_RECVSEND_BUNDLE)
 
 int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
@@ -641,21 +765,14 @@ int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	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))
+	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;
+	if (req->flags & REQ_F_BUFFER_SELECT) {
 		/*
 		 * Store the buffer group for this multishot receive separately,
 		 * as if we end up doing an io-wq based issue that selects a
@@ -665,6 +782,20 @@ int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 		 * restore it.
 		 */
 		sr->buf_group = req->buf_index;
+		req->buf_list = NULL;
+	}
+	if (sr->flags & IORING_RECV_MULTISHOT) {
+		if (!(req->flags & REQ_F_BUFFER_SELECT))
+			return -EINVAL;
+		if (sr->msg_flags & MSG_WAITALL)
+			return -EINVAL;
+		if (req->opcode == IORING_OP_RECV && sr->len)
+			return -EINVAL;
+		req->flags |= REQ_F_APOLL_MULTISHOT;
+	}
+	if (sr->flags & IORING_RECVSEND_BUNDLE) {
+		if (req->opcode == IORING_OP_RECVMSG)
+			return -EINVAL;
 	}
 
 #ifdef CONFIG_COMPAT
@@ -672,17 +803,7 @@ int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 		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;
+	return io_recvmsg_prep_setup(req);
 }
 
 /*
@@ -692,28 +813,36 @@ static inline void io_recv_prep_retry(struct io_kiocb *req)
  * again (for multishot).
  */
 static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
-				  struct msghdr *msg, bool mshot_finished,
-				  unsigned issue_flags)
+				  struct io_async_msghdr *kmsg,
+				  bool mshot_finished, unsigned issue_flags)
 {
+	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
 	unsigned int cflags;
 
-	cflags = io_put_kbuf(req, issue_flags);
-	if (msg->msg_inq > 0)
+	if (sr->flags & IORING_RECVSEND_BUNDLE)
+		cflags = io_put_kbufs(req, io_bundle_nbufs(kmsg, *ret),
+				      issue_flags);
+	else
+		cflags = io_put_kbuf(req, issue_flags);
+
+	if (kmsg->msg.msg_inq > 0)
 		cflags |= IORING_CQE_F_SOCK_NONEMPTY;
 
+	/* bundle with no more immediate buffers, we're done */
+	if (sr->flags & IORING_RECVSEND_BUNDLE && req->flags & REQ_F_BL_EMPTY)
+		goto finish;
+
 	/*
 	 * Fill CQE for this receive and see if we should keep trying to
 	 * receive from this socket.
 	 */
 	if ((req->flags & REQ_F_APOLL_MULTISHOT) && !mshot_finished &&
-	    io_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);
+	    io_req_post_cqe(req, *ret, cflags | IORING_CQE_F_MORE)) {
 		int mshot_retry_ret = IOU_ISSUE_SKIP_COMPLETE;
 
-		io_recv_prep_retry(req);
+		io_mshot_prep_retry(req, kmsg);
 		/* Known not-empty or unknown state, retry */
-		if (cflags & IORING_CQE_F_SOCK_NONEMPTY || msg->msg_inq < 0) {
+		if (cflags & IORING_CQE_F_SOCK_NONEMPTY || kmsg->msg.msg_inq < 0) {
 			if (sr->nr_multishot_loops++ < MULTISHOT_MAX_RETRY)
 				return false;
 			/* mshot retries exceeded, force a requeue */
@@ -728,12 +857,14 @@ static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
 	}
 
 	/* Finish the request / stop multishot. */
+finish:
 	io_req_set_res(req, *ret, cflags);
 
 	if (issue_flags & IO_URING_F_MULTISHOT)
 		*ret = IOU_STOP_MULTISHOT;
 	else
 		*ret = IOU_OK;
+	io_req_msg_cleanup(req, issue_flags);
 	return true;
 }
 
@@ -824,7 +955,7 @@ static int io_recvmsg_multishot(struct socket *sock, struct io_sr_msg *io,
 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 io_async_msghdr *kmsg = req->async_data;
 	struct socket *sock;
 	unsigned flags;
 	int ret, min_ret = 0;
@@ -835,18 +966,9 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
 	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);
+		return -EAGAIN;
 
 	flags = sr->msg_flags;
 	if (force_nonblock)
@@ -888,17 +1010,16 @@ retry_multishot:
 
 	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)) {
+			if (issue_flags & IO_URING_F_MULTISHOT) {
 				io_kbuf_recycle(req, issue_flags);
 				return IOU_ISSUE_SKIP_COMPLETE;
 			}
-			return ret;
+			return -EAGAIN;
 		}
 		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);
+			return -EAGAIN;
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
@@ -914,21 +1035,79 @@ retry_multishot:
 	else
 		io_kbuf_recycle(req, issue_flags);
 
-	if (!io_recv_finish(req, &ret, &kmsg->msg, mshot_finished, issue_flags))
+	if (!io_recv_finish(req, &ret, kmsg, 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;
 }
 
+static int io_recv_buf_select(struct io_kiocb *req, struct io_async_msghdr *kmsg,
+			      size_t *len, unsigned int issue_flags)
+{
+	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
+	int ret;
+
+	/*
+	 * If the ring isn't locked, then don't use the peek interface
+	 * to grab multiple buffers as we will lock/unlock between
+	 * this selection and posting the buffers.
+	 */
+	if (!(issue_flags & IO_URING_F_UNLOCKED) &&
+	    sr->flags & IORING_RECVSEND_BUNDLE) {
+		struct buf_sel_arg arg = {
+			.iovs = &kmsg->fast_iov,
+			.nr_iovs = 1,
+			.mode = KBUF_MODE_EXPAND,
+		};
+
+		if (kmsg->free_iov) {
+			arg.nr_iovs = kmsg->free_iov_nr;
+			arg.iovs = kmsg->free_iov;
+			arg.mode |= KBUF_MODE_FREE;
+		}
+
+		if (kmsg->msg.msg_inq > 0)
+			arg.max_len = min_not_zero(sr->len, kmsg->msg.msg_inq);
+
+		ret = io_buffers_peek(req, &arg);
+		if (unlikely(ret < 0))
+			return ret;
+
+		/* special case 1 vec, can be a fast path */
+		if (ret == 1) {
+			sr->buf = arg.iovs[0].iov_base;
+			sr->len = arg.iovs[0].iov_len;
+			goto map_ubuf;
+		}
+		iov_iter_init(&kmsg->msg.msg_iter, ITER_DEST, arg.iovs, ret,
+				arg.out_len);
+		if (arg.iovs != &kmsg->fast_iov && arg.iovs != kmsg->free_iov) {
+			kmsg->free_iov_nr = ret;
+			kmsg->free_iov = arg.iovs;
+		}
+	} else {
+		void __user *buf;
+
+		*len = sr->len;
+		buf = io_buffer_select(req, len, issue_flags);
+		if (!buf)
+			return -ENOBUFS;
+		sr->buf = buf;
+		sr->len = *len;
+map_ubuf:
+		ret = import_ubuf(ITER_DEST, sr->buf, sr->len,
+				  &kmsg->msg.msg_iter);
+		if (unlikely(ret))
+			return ret;
+	}
+
+	return 0;
+}
+
 int io_recv(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
-	struct msghdr msg;
+	struct io_async_msghdr *kmsg = req->async_data;
 	struct socket *sock;
 	unsigned flags;
 	int ret, min_ret = 0;
@@ -943,40 +1122,25 @@ int io_recv(struct io_kiocb *req, unsigned int issue_flags)
 	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 = io_recv_buf_select(req, kmsg, &len, issue_flags);
+		if (unlikely(ret))
+			goto out_free;
+		sr->buf = NULL;
 	}
 
-	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;
+	kmsg->msg.msg_inq = -1;
+	kmsg->msg.msg_flags = 0;
 
 	if (flags & MSG_WAITALL)
-		min_ret = iov_iter_count(&msg.msg_iter);
+		min_ret = iov_iter_count(&kmsg->msg.msg_iter);
 
-	ret = sock_recvmsg(sock, &msg, flags);
+	ret = sock_recvmsg(sock, &kmsg->msg, flags);
 	if (ret < min_ret) {
 		if (ret == -EAGAIN && force_nonblock) {
 			if (issue_flags & IO_URING_F_MULTISHOT) {
@@ -996,7 +1160,7 @@ retry_multishot:
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
 		req_set_fail(req);
-	} else if ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
+	} else if ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))) {
 out_free:
 		req_set_fail(req);
 	}
@@ -1008,7 +1172,7 @@ out_free:
 	else
 		io_kbuf_recycle(req, issue_flags);
 
-	if (!io_recv_finish(req, &ret, &msg, ret <= 0, issue_flags))
+	if (!io_recv_finish(req, &ret, kmsg, ret <= 0, issue_flags))
 		goto retry_multishot;
 
 	return ret;
@@ -1017,14 +1181,10 @@ out_free:
 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;
+	struct io_async_msghdr *io = req->async_data;
 
-	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 (req_has_async_data(req))
+		io_netmsg_iovec_free(io);
 	if (zc->notif) {
 		io_notif_flush(zc->notif);
 		zc->notif = NULL;
@@ -1041,6 +1201,7 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	struct io_kiocb *notif;
 
 	zc->done_io = 0;
+	req->flags |= REQ_F_POLL_NO_LAZY;
 
 	if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)))
 		return -EINVAL;
@@ -1061,8 +1222,11 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 		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;
+			struct io_notif_data *nd = io_notif_to_data(notif);
+
+			nd->zc_report = true;
+			nd->zc_used = false;
+			nd->zc_copied = false;
 		}
 	}
 
@@ -1090,7 +1254,7 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 
 	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;
+	zc->msg_flags = READ_ONCE(sqe->msg_flags) | MSG_NOSIGNAL | MSG_ZEROCOPY;
 	if (zc->msg_flags & MSG_DONTWAIT)
 		req->flags |= REQ_F_NOWAIT;
 
@@ -1098,7 +1262,7 @@ int io_send_zc_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	if (req->ctx->compat)
 		zc->msg_flags |= MSG_CMSG_COMPAT;
 #endif
-	return 0;
+	return io_sendmsg_prep_setup(req, req->opcode == IORING_OP_SENDMSG_ZC);
 }
 
 static int io_sg_from_iter_iovec(struct sock *sk, struct sk_buff *skb,
@@ -1159,11 +1323,34 @@ static int io_sg_from_iter(struct sock *sk, struct sk_buff *skb,
 	return ret;
 }
 
+static int io_send_zc_import(struct io_kiocb *req, struct io_async_msghdr *kmsg)
+{
+	struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
+	int ret;
+
+	if (sr->flags & IORING_RECVSEND_FIXED_BUF) {
+		ret = io_import_fixed(ITER_SOURCE, &kmsg->msg.msg_iter, req->imu,
+					(u64)(uintptr_t)sr->buf, sr->len);
+		if (unlikely(ret))
+			return ret;
+		kmsg->msg.sg_from_iter = io_sg_from_iter;
+	} else {
+		ret = import_ubuf(ITER_SOURCE, sr->buf, sr->len, &kmsg->msg.msg_iter);
+		if (unlikely(ret))
+			return ret;
+		ret = io_notif_account_mem(sr->notif, sr->len);
+		if (unlikely(ret))
+			return ret;
+		kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
+	}
+
+	return ret;
+}
+
 int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
 {
-	struct sockaddr_storage __address;
 	struct io_sr_msg *zc = io_kiocb_to_cmd(req, struct io_sr_msg);
-	struct msghdr msg;
+	struct io_async_msghdr *kmsg = req->async_data;
 	struct socket *sock;
 	unsigned msg_flags;
 	int ret, min_ret = 0;
@@ -1174,67 +1361,37 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
 	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);
+		return -EAGAIN;
 
-	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 (!zc->done_io) {
+		ret = io_send_zc_import(req, kmsg);
 		if (unlikely(ret))
 			return ret;
-		msg.sg_from_iter = io_sg_from_iter_iovec;
 	}
 
-	msg_flags = zc->msg_flags | MSG_ZEROCOPY;
+	msg_flags = zc->msg_flags;
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		msg_flags |= MSG_DONTWAIT;
 	if (msg_flags & MSG_WAITALL)
-		min_ret = iov_iter_count(&msg.msg_iter);
+		min_ret = iov_iter_count(&kmsg->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);
+	kmsg->msg.msg_flags = msg_flags;
+	kmsg->msg.msg_ubuf = &io_notif_to_data(zc->notif)->uarg;
+	ret = sock_sendmsg(sock, &kmsg->msg);
 
 	if (unlikely(ret < min_ret)) {
 		if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
-			return io_setup_async_addr(req, &__address, issue_flags);
+			return -EAGAIN;
 
-		if (ret > 0 && io_net_retry(sock, msg.msg_flags)) {
+		if (ret > 0 && io_net_retry(sock, kmsg->msg.msg_flags)) {
 			zc->len -= ret;
 			zc->buf += ret;
 			zc->done_io += ret;
 			req->flags |= REQ_F_BL_NO_RECYCLE;
-			return io_setup_async_addr(req, &__address, issue_flags);
+			return -EAGAIN;
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
@@ -1252,7 +1409,7 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
 	 */
 	if (!(issue_flags & IO_URING_F_UNLOCKED)) {
 		io_notif_flush(zc->notif);
-		req->flags &= ~REQ_F_NEED_CLEANUP;
+		io_req_msg_cleanup(req, 0);
 	}
 	io_req_set_res(req, ret, IORING_CQE_F_MORE);
 	return IOU_OK;
@@ -1261,62 +1418,46 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
 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 io_async_msghdr *kmsg = req->async_data;
 	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);
+		return -EAGAIN;
 
-	flags = sr->msg_flags | MSG_ZEROCOPY;
+	flags = sr->msg_flags;
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		flags |= MSG_DONTWAIT;
 	if (flags & MSG_WAITALL)
 		min_ret = iov_iter_count(&kmsg->msg.msg_iter);
 
+	kmsg->msg.msg_control_user = sr->msg_control;
 	kmsg->msg.msg_ubuf = &io_notif_to_data(sr->notif)->uarg;
 	kmsg->msg.sg_from_iter = io_sg_from_iter_iovec;
 	ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
 
 	if (unlikely(ret < min_ret)) {
 		if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
-			return io_setup_async_msg(req, kmsg, issue_flags);
+			return -EAGAIN;
 
 		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);
+			return -EAGAIN;
 		}
 		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)
@@ -1328,7 +1469,7 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
 	 */
 	if (!(issue_flags & IO_URING_F_UNLOCKED)) {
 		io_notif_flush(sr->notif);
-		req->flags &= ~REQ_F_NEED_CLEANUP;
+		io_req_msg_cleanup(req, 0);
 	}
 	io_req_set_res(req, ret, IORING_CQE_F_MORE);
 	return IOU_OK;
@@ -1346,10 +1487,12 @@ void io_sendrecv_fail(struct io_kiocb *req)
 		req->cqe.flags |= IORING_CQE_F_MORE;
 }
 
+#define ACCEPT_FLAGS	(IORING_ACCEPT_MULTISHOT | IORING_ACCEPT_DONTWAIT | \
+			 IORING_ACCEPT_POLL_FIRST)
+
 int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 {
 	struct io_accept *accept = io_kiocb_to_cmd(req, struct io_accept);
-	unsigned flags;
 
 	if (sqe->len || sqe->buf_index)
 		return -EINVAL;
@@ -1358,15 +1501,15 @@ int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	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)
+	accept->iou_flags = READ_ONCE(sqe->ioprio);
+	if (accept->iou_flags & ~ACCEPT_FLAGS)
 		return -EINVAL;
 
 	accept->file_slot = READ_ONCE(sqe->file_index);
 	if (accept->file_slot) {
 		if (accept->flags & SOCK_CLOEXEC)
 			return -EINVAL;
-		if (flags & IORING_ACCEPT_MULTISHOT &&
+		if (accept->iou_flags & IORING_ACCEPT_MULTISHOT &&
 		    accept->file_slot != IORING_FILE_INDEX_ALLOC)
 			return -EINVAL;
 	}
@@ -1374,8 +1517,10 @@ int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 		return -EINVAL;
 	if (SOCK_NONBLOCK != O_NONBLOCK && (accept->flags & SOCK_NONBLOCK))
 		accept->flags = (accept->flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
-	if (flags & IORING_ACCEPT_MULTISHOT)
+	if (accept->iou_flags & IORING_ACCEPT_MULTISHOT)
 		req->flags |= REQ_F_APOLL_MULTISHOT;
+	if (accept->iou_flags & IORING_ACCEPT_DONTWAIT)
+		req->flags |= REQ_F_NOWAIT;
 	return 0;
 }
 
@@ -1383,24 +1528,34 @@ 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 proto_accept_arg arg = {
+		.flags = force_nonblock ? O_NONBLOCK : 0,
+	};
 	struct file *file;
+	unsigned cflags;
 	int ret, fd;
 
+	if (!(req->flags & REQ_F_POLLED) &&
+	    accept->iou_flags & IORING_ACCEPT_POLL_FIRST)
+		return -EAGAIN;
+
 retry:
 	if (!fixed) {
 		fd = __get_unused_fd_flags(accept->flags, accept->nofile);
 		if (unlikely(fd < 0))
 			return fd;
 	}
-	file = do_accept(req->file, file_flags, accept->addr, accept->addr_len,
+	arg.err = 0;
+	arg.is_empty = -1;
+	file = do_accept(req->file, &arg, accept->addr, accept->addr_len,
 			 accept->flags);
 	if (IS_ERR(file)) {
 		if (!fixed)
 			put_unused_fd(fd);
 		ret = PTR_ERR(file);
-		if (ret == -EAGAIN && force_nonblock) {
+		if (ret == -EAGAIN && force_nonblock &&
+		    !(accept->iou_flags & IORING_ACCEPT_DONTWAIT)) {
 			/*
 			 * if it's multishot and polled, we don't need to
 			 * return EAGAIN to arm the poll infra since it
@@ -1421,18 +1576,26 @@ retry:
 						accept->file_slot);
 	}
 
+	cflags = 0;
+	if (!arg.is_empty)
+		cflags |= IORING_CQE_F_SOCK_NONEMPTY;
+
 	if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
-		io_req_set_res(req, ret, 0);
+		io_req_set_res(req, ret, cflags);
 		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;
+	if (io_req_post_cqe(req, ret, cflags | IORING_CQE_F_MORE)) {
+		if (cflags & IORING_CQE_F_SOCK_NONEMPTY || arg.is_empty == -1)
+			goto retry;
+		if (issue_flags & IO_URING_F_MULTISHOT)
+			return IOU_ISSUE_SKIP_COMPLETE;
+		return -EAGAIN;
+	}
 
-	io_req_set_res(req, ret, 0);
+	io_req_set_res(req, ret, cflags);
 	return IOU_STOP_MULTISHOT;
 }
 
@@ -1490,17 +1653,10 @@ int io_socket(struct io_kiocb *req, unsigned int issue_flags)
 	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);
+	struct io_async_msghdr *io;
 
 	if (sqe->len || sqe->buf_index || sqe->rw_flags || sqe->splice_fd_in)
 		return -EINVAL;
@@ -1508,32 +1664,26 @@ int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	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;
+
+	io = io_msg_alloc_async(req);
+	if (unlikely(!io))
+		return -ENOMEM;
+
+	return move_addr_to_kernel(conn->addr, conn->addr_len, &io->addr);
 }
 
 int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_connect *connect = io_kiocb_to_cmd(req, struct io_connect);
-	struct io_async_connect __io, *io;
+	struct io_async_msghdr *io = req->async_data;
 	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);
+	ret = __sys_connect_file(req->file, &io->addr, connect->addr_len,
+				 file_flags);
 	if ((ret == -EAGAIN || ret == -EINPROGRESS || ret == -ECONNABORTED)
 	    && force_nonblock) {
 		if (ret == -EINPROGRESS) {
@@ -1543,13 +1693,6 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 				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) {
@@ -1567,12 +1710,20 @@ int io_connect(struct io_kiocb *req, unsigned int issue_flags)
 out:
 	if (ret < 0)
 		req_set_fail(req);
+	io_req_msg_cleanup(req, issue_flags);
 	io_req_set_res(req, ret, 0);
 	return IOU_OK;
 }
 
-void io_netmsg_cache_free(struct io_cache_entry *entry)
+void io_netmsg_cache_free(const void *entry)
 {
-	kfree(container_of(entry, struct io_async_msghdr, cache));
+	struct io_async_msghdr *kmsg = (struct io_async_msghdr *) entry;
+
+	if (kmsg->free_iov) {
+		kasan_mempool_unpoison_object(kmsg->free_iov,
+				kmsg->free_iov_nr * sizeof(struct iovec));
+		io_netmsg_iovec_free(kmsg);
+	}
+	kfree(kmsg);
 }
 #endif