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 * 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 * $FreeBSD$
35 */
36
37 #ifndef _SYS_UNPCB_H_
38 #define _SYS_UNPCB_H_
39
40 #include <sys/queue.h>
41
42 /*
43 * Protocol control block for an active
44 * instance of a UNIX internal protocol.
45 *
46 * A socket may be associated with an vnode in the
47 * file system. If so, the unp_vnode pointer holds
48 * a reference count to this vnode, which should be irele'd
49 * when the socket goes away.
50 *
51 * A socket may be connected to another socket, in which
52 * case the control block of the socket to which it is connected
53 * is given by unp_conn.
54 *
55 * A socket may be referenced by a number of sockets (e.g. several
56 * sockets may be connected to a datagram socket.) These sockets
57 * are in a linked list starting with unp_refs, linked through
58 * unp_nextref and null-terminated. Note that a socket may be referenced
59 * by a number of other sockets and may also reference a socket (not
60 * necessarily one which is referencing it). This generates
61 * the need for unp_refs and unp_nextref to be separate fields.
62 *
63 * Stream sockets keep copies of receive sockbuf sb_cc and sb_mbcnt
64 * so that changes in the sockbuf may be computed to modify
65 * back pressure on the sender accordingly.
66 */
67 typedef u_quad_t unp_gen_t;
68 LIST_HEAD(unp_head, unpcb);
69
70 struct unpcb {
71 LIST_ENTRY(unpcb) unp_link; /* glue on list of all PCBs */
72 struct socket *unp_socket; /* pointer back to socket */
73 struct vnode *unp_vnode; /* if associated with file */
74 ino_t unp_ino; /* fake inode number */
75 struct unpcb *unp_conn; /* control block of connected socket */
76 struct unp_head unp_refs; /* referencing socket linked list */
77 LIST_ENTRY(unpcb) unp_reflink; /* link in unp_refs list */
78 struct sockaddr_un *unp_addr; /* bound address of socket */
79 int unp_cc; /* copy of rcv.sb_cc */
80 int unp_mbcnt; /* copy of rcv.sb_mbcnt */
81 unp_gen_t unp_gencnt; /* generation count of this instance */
82 };
83
84 #define sotounpcb(so) ((struct unpcb *)((so)->so_pcb))
85
86 /* Hack alert -- this structure depends on <sys/socketvar.h>. */
87 #ifdef _SYS_SOCKETVAR_H_
88 struct xunpcb {
89 size_t xu_len; /* length of this structure */
90 struct unpcb *xu_unpp; /* to help netstat, fstat */
91 struct unpcb xu_unp; /* our information */
92 union {
93 struct sockaddr_un xuu_addr; /* our bound address */
94 char xu_dummy1[256];
95 } xu_au;
96 #define xu_addr xu_au.xuu_addr
97 union {
98 struct sockaddr_un xuu_caddr; /* their bound address */
99 char xu_dummy2[256];
100 } xu_cau;
101 #define xu_caddr xu_cau.xuu_caddr
102 struct xsocket xu_socket;
103 u_quad_t xu_alignment_hack;
104 };
105
106 struct xunpgen {
107 size_t xug_len;
108 u_int xug_count;
109 unp_gen_t xug_gen;
110 so_gen_t xug_sogen;
111 };
112 #endif /* _SYS_SOCKETVAR_H_ */
113
114 #endif /* _SYS_UNPCB_H_ */
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