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/* $OpenBSD: unpcb.h,v 1.17 2019/07/15 12:28:06 bluhm Exp $ */
/* $NetBSD: unpcb.h,v 1.6 1994/06/29 06:46:08 cgd Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)unpcb.h 8.1 (Berkeley) 6/2/93
*/
/*
* Protocol control block for an active
* instance of a UNIX internal protocol.
*
* A socket may be associated with an vnode in the
* file system. If so, the unp_vnode pointer holds
* a reference count to this vnode, which should be vrele'd
* when the socket goes away.
*
* A socket may be connected to another socket, in which
* case the control block of the socket to which it is connected
* is given by unp_conn.
*
* A socket may be referenced by a number of sockets (e.g. several
* sockets may be connected to a datagram socket.) These sockets
* are in a linked list starting with unp_refs, linked through
* unp_nextref and null-terminated. Note that a socket may be referenced
* by a number of other sockets and may also reference a socket (not
* necessarily one which is referencing it). This generates
* the need for unp_refs and unp_nextref to be separate fields.
*
* Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
* so that changes in the sockbuf may be computed to modify
* back pressure on the sender accordingly.
*/
struct unpcb {
struct socket *unp_socket; /* pointer back to socket */
struct vnode *unp_vnode; /* if associated with file */
struct file *unp_file; /* backpointer for unp_gc() */
struct unpcb *unp_conn; /* control block of connected socket */
ino_t unp_ino; /* fake inode number */
SLIST_HEAD(,unpcb) unp_refs; /* referencing socket linked list */
SLIST_ENTRY(unpcb) unp_nextref; /* link in unp_refs list */
struct mbuf *unp_addr; /* bound address of socket */
long unp_msgcount; /* references from socket rcv buf */
int unp_flags; /* this unpcb contains peer eids */
struct sockpeercred unp_connid;/* id of peer process */
struct timespec unp_ctime; /* holds creation time */
LIST_ENTRY(unpcb) unp_link; /* link in per-AF list of sockets */
};
/*
* flag bits in unp_flags
*/
#define UNP_FEIDS 0x01 /* unp_connid contains information */
#define UNP_FEIDSBIND 0x02 /* unp_connid was set by a bind */
#define UNP_GCMARK 0x04 /* mark during unp_gc() */
#define UNP_GCDEFER 0x08 /* ref'd, but not marked in this pass */
#define UNP_GCDEAD 0x10 /* unref'd in this pass */
#define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
#ifdef _KERNEL
struct fdpass {
struct file *fp;
int flags;
};
int uipc_usrreq(struct socket *, int , struct mbuf *,
struct mbuf *, struct mbuf *, struct proc *);
int uipc_attach(struct socket *, int);
int uipc_detach(struct socket *);
void unp_init(void);
int unp_bind(struct unpcb *, struct mbuf *, struct proc *);
int unp_connect(struct socket *, struct mbuf *, struct proc *);
int unp_connect2(struct socket *, struct socket *);
void unp_detach(struct unpcb *);
void unp_disconnect(struct unpcb *);
void unp_drop(struct unpcb *, int);
void unp_gc(void *);
void unp_shutdown(struct unpcb *);
int unp_externalize(struct mbuf *, socklen_t, int);
int unp_internalize(struct mbuf *, struct proc *);
void unp_dispose(struct mbuf *);
#endif /* _KERNEL */
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