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1 /*
2 * Copyright (c) 2004, 2008
3 * The President and Fellows of Harvard College.
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. 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 UNIVERSITY 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 UNIVERSITY 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
30 #ifndef _KERN_SOCKET_H_
31 #define _KERN_SOCKET_H_
32
33 /*
34 * Socket-related definitions, for <sys/socket.h>.
35 */
36
37
38 /*
39 * Important
40 */
41
42 /* Socket types that we (might) support. */
43 #define SOCK_STREAM 1 /* stream */
44 #define SOCK_DGRAM 2 /* packet */
45 #define SOCK_RAW 3 /* raw packet */
46
47 /* Address families that we (might) support. */
48 #define AF_UNSPEC 0
49 #define AF_UNIX 1
50 #define AF_INET 2
51 #define AF_INET6 3
52
53 /* Protocol families. Pointless layer of indirection in the standard API. */
54 #define PF_UNSPEC AF_UNSPEC
55 #define PF_UNIX AF_UNIX
56 #define PF_INET AF_INET
57 #define PF_INET6 AF_INET6
58
59 /*
60 * Socket address structures. Socket addresses are polymorphic, and
61 * the polymorphism is handled by casting pointers. It's fairly gross,
62 * but way too deeply standardized to ever change.
63 *
64 * Each address family defines a sockaddr type (sockaddr_un,
65 * sockaddr_in, etc.) struct sockaddr is the common prefix of all
66 * these, and struct sockaddr_storage is defined to be large enough to
67 * hold any of them.
68 *
69 * The complex padding in sockaddr_storage forces it to be aligned,
70 * which wouldn't happen if it were just a char array.
71 */
72
73 struct sockaddr {
74 __u8 sa_len;
75 __u8 sa_family;
76 };
77
78 #define _SS_SIZE 128
79 struct sockaddr_storage {
80 __u8 ss_len;
81 __u8 ss_family;
82 __u8 __ss_pad1;
83 __u8 __ss_pad2;
84 __u32 __ss_pad3;
85 __u64 __ss_pad4;
86 char __ss_pad5[_SS_SIZE - sizeof(__u64) - sizeof(__u32) - 4*sizeof(__u8)];
87 };
88
89
90 /*
91 * Not very important.
92 */
93
94 /*
95 * msghdr structures for sendmsg() and recvmsg().
96 */
97
98 struct msghdr {
99 void *msg_name; /* really sockaddr; address, or null */
100 socklen_t msg_namelen; /* size of msg_name object, or 0 */
101 struct iovec *msg_iov; /* I/O buffers */
102 int msg_iovlen; /* number of iovecs */
103 void *msg_control; /* auxiliary data area, or null */
104 socklen_t msg_controllen; /* size of msg_control area */
105 int msg_flags; /* flags */
106 };
107
108 struct cmsghdr {
109 socklen_t cmsg_len; /* length of control data, including header */
110 int cmsg_level; /* protocol layer item originates from */
111 int cmsg_type; /* protocol-specific message type */
112 /* char cmsg_data[];*/ /* data follows the header */
113 };
114
115
116 #endif /* _KERN_SOCKET_H_ */