/*-
* 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.
* 4. 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
* $FreeBSD$
*/
#ifndef _SYS_UNPCB_H_
#define _SYS_UNPCB_H_
#include <sys/queue.h>
#include <sys/ucred.h>
/*
* Protocol control block for an active
* instance of a UNIX internal protocol.
*
* A socket may be associated with a vnode in the
* filesystem. If so, the unp_vnode pointer holds
* a reference count to this vnode, which should be irele'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.
*/
typedef u_quad_t unp_gen_t;
LIST_HEAD(unp_head, unpcb);
struct unpcb {
LIST_ENTRY(unpcb) unp_link; /* glue on list of all PCBs */
struct socket *unp_socket; /* pointer back to socket */
struct file *unp_file; /* back-pointer to file for gc. */
struct vnode *unp_vnode; /* if associated with file */
ino_t unp_ino; /* fake inode number */
struct unpcb *unp_conn; /* control block of connected socket */
struct unp_head unp_refs; /* referencing socket linked list */
LIST_ENTRY(unpcb) unp_reflink; /* link in unp_refs list */
struct sockaddr_un *unp_addr; /* bound address of socket */
int unp_cc; /* copy of rcv.sb_cc */
int unp_mbcnt; /* copy of rcv.sb_mbcnt */
unp_gen_t unp_gencnt; /* generation count of this instance */
short unp_flags; /* flags */
short unp_gcflag; /* Garbage collector flags. */
struct xucred unp_peercred; /* peer credentials, if applicable */
u_int unp_refcount;
u_int unp_msgcount; /* references from message queue */
struct mtx unp_mtx; /* mutex */
};
/*
* Flags in unp_flags.
*
* UNP_HAVEPC - indicates that the unp_peercred member is filled in
* and is really the credentials of the connected peer. This is used
* to determine whether the contents should be sent to the user or
* not.
*
* UNP_HAVEPCCACHED - indicates that the unp_peercred member is filled
* in, but does *not* contain the credentials of the connected peer
* (there may not even be a peer). This is set in unp_listen() when
* it fills in unp_peercred for later consumption by unp_connect().
*/
#define UNP_HAVEPC 0x001
#define UNP_HAVEPCCACHED 0x002
#define UNP_WANTCRED 0x004 /* credentials wanted */
#define UNP_CONNWAIT 0x008 /* connect blocks until accepted */
#define UNPGC_REF 0x1 /* unpcb has external ref. */
#define UNPGC_DEAD 0x2 /* unpcb might be dead. */
#define UNPGC_SCANNED 0x4 /* Has been scanned. */
/*
* These flags are used to handle non-atomicity in connect() and bind()
* operations on a socket: in particular, to avoid races between multiple
* threads or processes operating simultaneously on the same socket.
*/
#define UNP_CONNECTING 0x010 /* Currently connecting. */
#define UNP_BINDING 0x020 /* Currently binding. */
#define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
/* Hack alert -- this structure depends on <sys/socketvar.h>. */
#ifdef _SYS_SOCKETVAR_H_
struct xunpcb {
size_t xu_len; /* length of this structure */
struct unpcb *xu_unpp; /* to help netstat, fstat */
struct unpcb xu_unp; /* our information */
union {
struct sockaddr_un xuu_addr; /* our bound address */
char xu_dummy1[256];
} xu_au;
#define xu_addr xu_au.xuu_addr
union {
struct sockaddr_un xuu_caddr; /* their bound address */
char xu_dummy2[256];
} xu_cau;
#define xu_caddr xu_cau.xuu_caddr
struct xsocket xu_socket;
u_quad_t xu_alignment_hack;
};
struct xunpgen {
size_t xug_len;
u_int xug_count;
unp_gen_t xug_gen;
so_gen_t xug_sogen;
};
#endif /* _SYS_SOCKETVAR_H_ */
#endif /* _SYS_UNPCB_H_ */
