FreeBSD/Linux Kernel Cross Reference
sys/sys/unpcb.h
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)unpcb.h 8.1 (Berkeley) 6/2/93
30 * $FreeBSD: releng/5.4/sys/sys/unpcb.h 145335 2005-04-20 19:11:07Z cvs2svn $
31 */
32
33 #ifndef _SYS_UNPCB_H_
34 #define _SYS_UNPCB_H_
35
36 #include <sys/queue.h>
37 #include <sys/ucred.h>
38
39 /*
40 * Protocol control block for an active
41 * instance of a UNIX internal protocol.
42 *
43 * A socket may be associated with a vnode in the
44 * filesystem. If so, the unp_vnode pointer holds
45 * a reference count to this vnode, which should be irele'd
46 * when the socket goes away.
47 *
48 * A socket may be connected to another socket, in which
49 * case the control block of the socket to which it is connected
50 * is given by unp_conn.
51 *
52 * A socket may be referenced by a number of sockets (e.g. several
53 * sockets may be connected to a datagram socket.) These sockets
54 * are in a linked list starting with unp_refs, linked through
55 * unp_nextref and null-terminated. Note that a socket may be referenced
56 * by a number of other sockets and may also reference a socket (not
57 * necessarily one which is referencing it). This generates
58 * the need for unp_refs and unp_nextref to be separate fields.
59 *
60 * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
61 * so that changes in the sockbuf may be computed to modify
62 * back pressure on the sender accordingly.
63 */
64 typedef u_quad_t unp_gen_t;
65 LIST_HEAD(unp_head, unpcb);
66
67 struct unpcb {
68 LIST_ENTRY(unpcb) unp_link; /* glue on list of all PCBs */
69 struct socket *unp_socket; /* pointer back to socket */
70 struct vnode *unp_vnode; /* if associated with file */
71 ino_t unp_ino; /* fake inode number */
72 struct unpcb *unp_conn; /* control block of connected socket */
73 struct unp_head unp_refs; /* referencing socket linked list */
74 LIST_ENTRY(unpcb) unp_reflink; /* link in unp_refs list */
75 struct sockaddr_un *unp_addr; /* bound address of socket */
76 int unp_cc; /* copy of rcv.sb_cc */
77 int unp_mbcnt; /* copy of rcv.sb_mbcnt */
78 unp_gen_t unp_gencnt; /* generation count of this instance */
79 int unp_flags; /* flags */
80 struct xucred unp_peercred; /* peer credentials, if applicable */
81 };
82
83 /*
84 * Flags in unp_flags.
85 *
86 * UNP_HAVEPC - indicates that the unp_peercred member is filled in
87 * and is really the credentials of the connected peer. This is used
88 * to determine whether the contents should be sent to the user or
89 * not.
90 *
91 * UNP_HAVEPCCACHED - indicates that the unp_peercred member is filled
92 * in, but does *not* contain the credentials of the connected peer
93 * (there may not even be a peer). This is set in unp_listen() when
94 * it fills in unp_peercred for later consumption by unp_connect().
95 */
96 #define UNP_HAVEPC 0x001
97 #define UNP_HAVEPCCACHED 0x002
98
99 #define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
100
101 /* Hack alert -- this structure depends on <sys/socketvar.h>. */
102 #ifdef _SYS_SOCKETVAR_H_
103 struct xunpcb {
104 size_t xu_len; /* length of this structure */
105 struct unpcb *xu_unpp; /* to help netstat, fstat */
106 struct unpcb xu_unp; /* our information */
107 union {
108 struct sockaddr_un xuu_addr; /* our bound address */
109 char xu_dummy1[256];
110 } xu_au;
111 #define xu_addr xu_au.xuu_addr
112 union {
113 struct sockaddr_un xuu_caddr; /* their bound address */
114 char xu_dummy2[256];
115 } xu_cau;
116 #define xu_caddr xu_cau.xuu_caddr
117 struct xsocket xu_socket;
118 u_quad_t xu_alignment_hack;
119 };
120
121 struct xunpgen {
122 size_t xug_len;
123 u_int xug_count;
124 unp_gen_t xug_gen;
125 so_gen_t xug_sogen;
126 };
127 #endif /* _SYS_SOCKETVAR_H_ */
128
129 #endif /* _SYS_UNPCB_H_ */
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