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Similar to multishot recv, this will require provided buffers to be used. However recvmsg is much more complex than recv as it has multiple outputs. Specifically flags, name, and control messages. Support this by introducing a new struct io_uring_recvmsg_out with 4 fields. namelen, controllen and flags match the similar out fields in msghdr from standard recvmsg(2), payloadlen is the length of the payload following the header. This struct is placed at the start of the returned buffer. Based on what the user specifies in struct msghdr, the next bytes of the buffer will be name (the next msg_namelen bytes), and then control (the next msg_controllen bytes). The payload will come at the end. The return value in the CQE is the total used size of the provided buffer. Signed-off-by: Dylan Yudaken <dylany@fb.com> Link: https://lore.kernel.org/r/20220714110258.1336200-4-dylany@fb.com [axboe: style fixups, see link] Signed-off-by: Jens Axboe <axboe@kernel.dk>
61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/net.h>
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#include <linux/uio.h>
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#include "alloc_cache.h"
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#if defined(CONFIG_NET)
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struct io_async_msghdr {
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union {
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struct iovec fast_iov[UIO_FASTIOV];
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struct {
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struct iovec fast_iov_one;
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__kernel_size_t controllen;
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int namelen;
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__kernel_size_t payloadlen;
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};
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struct io_cache_entry cache;
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};
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/* points to an allocated iov, if NULL we use fast_iov instead */
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struct iovec *free_iov;
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struct sockaddr __user *uaddr;
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struct msghdr msg;
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struct sockaddr_storage addr;
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};
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struct io_async_connect {
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struct sockaddr_storage address;
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};
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int io_shutdown_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_shutdown(struct io_kiocb *req, unsigned int issue_flags);
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int io_sendmsg_prep_async(struct io_kiocb *req);
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void io_sendmsg_recvmsg_cleanup(struct io_kiocb *req);
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int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags);
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int io_send(struct io_kiocb *req, unsigned int issue_flags);
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int io_recvmsg_prep_async(struct io_kiocb *req);
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int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags);
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int io_recv(struct io_kiocb *req, unsigned int issue_flags);
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int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_accept(struct io_kiocb *req, unsigned int issue_flags);
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int io_socket_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_socket(struct io_kiocb *req, unsigned int issue_flags);
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int io_connect_prep_async(struct io_kiocb *req);
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int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_connect(struct io_kiocb *req, unsigned int issue_flags);
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void io_netmsg_cache_free(struct io_cache_entry *entry);
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#else
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static inline void io_netmsg_cache_free(struct io_cache_entry *entry)
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{
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}
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#endif
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