150 lines
5.7 KiB
C
150 lines
5.7 KiB
C
![]() |
/*-
|
||
|
* 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 reserved1;
|
||
|
int reserved2;
|
||
|
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. */
|
||
|
#define UNPGC_IGNORE_RIGHTS 0x8 /* Attached rights are freed */
|
||
|
|
||
|
/*
|
||
|
* 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_ */
|