146 lines
5.7 KiB
C
146 lines
5.7 KiB
C
/* $OpenBSD: unpcb.h,v 1.45 2022/11/26 17:51:18 mvs Exp $ */
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/* $NetBSD: unpcb.h,v 1.6 1994/06/29 06:46:08 cgd Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)unpcb.h 8.1 (Berkeley) 6/2/93
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*/
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#include <sys/refcnt.h>
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/*
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* Protocol control block for an active
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* instance of a UNIX internal protocol.
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*
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* A socket may be associated with an vnode in the
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* file system. If so, the unp_vnode pointer holds
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* a reference count to this vnode, which should be vrele'd
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* when the socket goes away.
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*
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* A socket may be connected to another socket, in which
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* case the control block of the socket to which it is connected
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* is given by unp_conn.
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*
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* A socket may be referenced by a number of sockets (e.g. several
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* sockets may be connected to a datagram socket.) These sockets
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* are in a linked list starting with unp_refs, linked through
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* unp_nextref and null-terminated. Note that a socket may be referenced
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* by a number of other sockets and may also reference a socket (not
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* necessarily one which is referencing it). This generates
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* the need for unp_refs and unp_nextref to be separate fields.
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*
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* Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
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* so that changes in the sockbuf may be computed to modify
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* back pressure on the sender accordingly.
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*
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* Locks used to protect struct members:
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* I immutable after creation
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* G unp_gc_lock
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* s socket lock
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*/
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struct unpcb {
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struct refcnt unp_refcnt; /* references to this pcb */
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struct socket *unp_socket; /* [I] pointer back to socket */
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struct vnode *unp_vnode; /* [s] if associated with file */
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struct file *unp_file; /* [G] backpointer for unp_gc() */
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struct unpcb *unp_conn; /* [s] control block of connected
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socket */
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ino_t unp_ino; /* [s] fake inode number */
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SLIST_HEAD(,unpcb) unp_refs; /* [s] referencing socket linked list */
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SLIST_ENTRY(unpcb) unp_nextref; /* [s] link in unp_refs list */
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struct mbuf *unp_addr; /* [s] bound address of socket */
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long unp_msgcount; /* [G] references from socket rcv buf */
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long unp_gcrefs; /* [G] references from gc */
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int unp_flags; /* [s] this unpcb contains peer eids */
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int unp_gcflags; /* [G] garbage collector flags */
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struct sockpeercred unp_connid;/* [s] id of peer process */
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struct timespec unp_ctime; /* [I] holds creation time */
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LIST_ENTRY(unpcb) unp_link; /* [G] link in per-AF list of sockets */
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};
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/*
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* flag bits in unp_flags
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*/
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#define UNP_FEIDS 0x01 /* unp_connid contains information */
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#define UNP_FEIDSBIND 0x02 /* unp_connid was set by a bind */
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#define UNP_BINDING 0x04 /* unp is binding now */
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#define UNP_CONNECTING 0x08 /* unp is connecting now */
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/*
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* flag bits in unp_gcflags
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*/
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#define UNP_GCDEAD 0x01 /* unp could be dead */
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#define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
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#ifdef _KERNEL
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struct stat;
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struct fdpass {
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struct file *fp;
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int flags;
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};
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extern const struct pr_usrreqs uipc_usrreqs;
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extern const struct pr_usrreqs uipc_dgram_usrreqs;
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int uipc_attach(struct socket *, int, int);
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int uipc_detach(struct socket *);
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int uipc_bind(struct socket *, struct mbuf *, struct proc *);
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int uipc_listen(struct socket *);
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int uipc_connect(struct socket *, struct mbuf *);
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int uipc_accept(struct socket *, struct mbuf *);
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int uipc_disconnect(struct socket *);
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int uipc_shutdown(struct socket *);
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int uipc_dgram_shutdown(struct socket *);
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void uipc_rcvd(struct socket *);
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int uipc_send(struct socket *, struct mbuf *, struct mbuf *,
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struct mbuf *);
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int uipc_dgram_send(struct socket *, struct mbuf *, struct mbuf *,
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struct mbuf *);
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void uipc_abort(struct socket *);
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int uipc_sense(struct socket *, struct stat *);
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int uipc_sockaddr(struct socket *, struct mbuf *);
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int uipc_peeraddr(struct socket *, struct mbuf *);
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int uipc_connect2(struct socket *, struct socket *);
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void unp_init(void);
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int unp_connect(struct socket *, struct mbuf *, struct proc *);
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int unp_connect2(struct socket *, struct socket *);
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void unp_detach(struct unpcb *);
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void unp_disconnect(struct unpcb *);
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void unp_gc(void *);
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int unp_externalize(struct mbuf *, socklen_t, int);
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int unp_internalize(struct mbuf *, struct proc *);
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void unp_dispose(struct mbuf *);
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#endif /* _KERNEL */
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