1 /* $OpenBSD: unpcb.h,v 1.7 2006/11/17 08:33:20 claudio Exp $ */ 2 /* $NetBSD: unpcb.h,v 1.6 1994/06/29 06:46:08 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1982, 1986, 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)unpcb.h 8.1 (Berkeley) 6/2/93 33 */ 34 35 /* 36 * Protocol control block for an active 37 * instance of a UNIX internal protocol. 38 * 39 * A socket may be associated with an vnode in the 40 * file system. If so, the unp_vnode pointer holds 41 * a reference count to this vnode, which should be irele'd 42 * when the socket goes away. 43 * 44 * A socket may be connected to another socket, in which 45 * case the control block of the socket to which it is connected 46 * is given by unp_conn. 47 * 48 * A socket may be referenced by a number of sockets (e.g. several 49 * sockets may be connected to a datagram socket.) These sockets 50 * are in a linked list starting with unp_refs, linked through 51 * unp_nextref and null-terminated. Note that a socket may be referenced 52 * by a number of other sockets and may also reference a socket (not 53 * necessarily one which is referencing it). This generates 54 * the need for unp_refs and unp_nextref to be separate fields. 55 * 56 * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt 57 * so that changes in the sockbuf may be computed to modify 58 * back pressure on the sender accordingly. 59 */ 60 struct unpcbid { 61 uid_t unp_euid; 62 gid_t unp_egid; 63 }; 64 65 struct unpcb { 66 struct socket *unp_socket; /* pointer back to socket */ 67 struct vnode *unp_vnode; /* if associated with file */ 68 ino_t unp_ino; /* fake inode number */ 69 struct unpcb *unp_conn; /* control block of connected socket */ 70 struct unpcb *unp_refs; /* referencing socket linked list */ 71 struct unpcb *unp_nextref; /* link in unp_refs list */ 72 struct mbuf *unp_addr; /* bound address of socket */ 73 int unp_flags; /* this unpcb contains peer eids */ 74 struct unpcbid unp_connid; /* id of peer process */ 75 int unp_cc; /* copy of rcv.sb_cc */ 76 int unp_mbcnt; /* copy of rcv.sb_mbcnt */ 77 struct timespec unp_ctime; /* holds creation time */ 78 }; 79 80 /* 81 * flag bits in unp_flags 82 */ 83 #define UNP_FEIDS 1 /* unp_connid contains information */ 84 #define UNP_FEIDSBIND 2 /* unp_connid was set by a bind */ 85 86 #define sotounpcb(so) ((struct unpcb *)((so)->so_pcb)) 87