1 /* 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)unpcb.h 8.1 (Berkeley) 6/2/93 34 * $FreeBSD: src/sys/sys/unpcb.h,v 1.9.2.1 2002/03/09 05:22:23 dd Exp $ 35 * $DragonFly: src/sys/sys/unpcb.h,v 1.5 2008/05/27 05:25:36 dillon Exp $ 36 */ 37 38 #ifndef _SYS_UNPCB_H_ 39 #define _SYS_UNPCB_H_ 40 41 #include <sys/queue.h> 42 #include <sys/ucred.h> 43 44 /* 45 * Protocol control block for an active 46 * instance of a UNIX internal protocol. 47 * 48 * A socket may be associated with an vnode in the 49 * file system. If so, the unp_vnode pointer holds 50 * a reference count to this vnode, which should be irele'd 51 * when the socket goes away. 52 * 53 * A socket may be connected to another socket, in which 54 * case the control block of the socket to which it is connected 55 * is given by unp_conn. 56 * 57 * A socket may be referenced by a number of sockets (e.g. several 58 * sockets may be connected to a datagram socket.) These sockets 59 * are in a linked list starting with unp_refs, linked through 60 * unp_nextref and null-terminated. Note that a socket may be referenced 61 * by a number of other sockets and may also reference a socket (not 62 * necessarily one which is referencing it). This generates 63 * the need for unp_refs and unp_nextref to be separate fields. 64 * 65 * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt 66 * so that changes in the sockbuf may be computed to modify 67 * back pressure on the sender accordingly. 68 */ 69 typedef u_quad_t unp_gen_t; 70 LIST_HEAD(unp_head, unpcb); 71 72 struct unpcb { 73 LIST_ENTRY(unpcb) unp_link; /* glue on list of all PCBs */ 74 struct socket *unp_socket; /* pointer back to socket */ 75 struct vnode *unp_vnode; /* if associated with file */ 76 struct vnode *unp_rvnode; /* root vp for creating process */ 77 ino_t unp_ino; /* fake inode number */ 78 struct unpcb *unp_conn; /* control block of connected socket */ 79 struct unp_head unp_refs; /* referencing socket linked list */ 80 LIST_ENTRY(unpcb) unp_reflink; /* link in unp_refs list */ 81 struct sockaddr_un *unp_addr; /* bound address of socket */ 82 int unp_refcnt; /* referece count */ 83 int unused02; 84 unp_gen_t unp_gencnt; /* generation count of this instance */ 85 int unp_flags; /* flags */ 86 struct xucred unp_peercred; /* peer credentials, if applicable */ 87 }; 88 89 /* 90 * Flags in unp_flags. 91 * 92 * UNP_HAVEPC - indicates that the unp_peercred member is filled in 93 * and is really the credentials of the connected peer. This is used 94 * to determine whether the contents should be sent to the user or 95 * not. 96 * 97 * UNP_HAVEPCCACHED - indicates that the unp_peercred member is filled 98 * in, but does *not* contain the credentials of the connected peer 99 * (there may not even be a peer). This is set in unp_listen() when 100 * it fills in unp_peercred for later consumption by unp_connect(). 101 */ 102 #define UNP_HAVEPC 0x001 103 #define UNP_HAVEPCCACHED 0x002 104 105 /* Hack alert -- this structure depends on <sys/socketvar.h>. */ 106 #ifdef _SYS_SOCKETVAR_H_ 107 struct xunpcb { 108 size_t xu_len; /* length of this structure */ 109 struct unpcb *xu_unpp; /* to help netstat, fstat */ 110 struct unpcb xu_unp; /* our information */ 111 union { 112 struct sockaddr_un xuu_addr; /* our bound address */ 113 char xu_dummy1[256]; 114 } xu_au; 115 #define xu_addr xu_au.xuu_addr 116 union { 117 struct sockaddr_un xuu_caddr; /* their bound address */ 118 char xu_dummy2[256]; 119 } xu_cau; 120 #define xu_caddr xu_cau.xuu_caddr 121 struct xsocket xu_socket; 122 u_quad_t xu_alignment_hack; 123 }; 124 #endif /* _SYS_SOCKETVAR_H_ */ 125 126 #endif /* _SYS_UNPCB_H_ */ 127