1/*
2 * Copyright (c) 1982, 1986, 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. 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 *	@(#)udp.h	8.1 (Berkeley) 6/10/93
30 * udp.h,v 1.3 1994/08/21 05:27:41 paul Exp
31 */
32
33#ifndef _UDP_H_
34#define _UDP_H_
35
36#define UDP_TTL 0x60
37#define UDP_UDPDATALEN 16192
38
39extern struct socket *udp_last_so;
40
41/*
42 * Udp protocol header.
43 * Per RFC 768, September, 1981.
44 */
45struct udphdr {
46	u_int16_t	uh_sport;		/* source port */
47	u_int16_t	uh_dport;		/* destination port */
48	int16_t	uh_ulen;		/* udp length */
49	u_int16_t	uh_sum;			/* udp checksum */
50};
51
52/*
53 * UDP kernel structures and variables.
54 */
55struct udpiphdr {
56	        struct  ipovly ui_i;            /* overlaid ip structure */
57	        struct  udphdr ui_u;            /* udp header */
58};
59#define ui_mbuf         ui_i.ih_mbuf.mptr
60#define ui_x1           ui_i.ih_x1
61#define ui_pr           ui_i.ih_pr
62#define ui_len          ui_i.ih_len
63#define ui_src          ui_i.ih_src
64#define ui_dst          ui_i.ih_dst
65#define ui_sport        ui_u.uh_sport
66#define ui_dport        ui_u.uh_dport
67#define ui_ulen         ui_u.uh_ulen
68#define ui_sum          ui_u.uh_sum
69
70#ifdef LOG_ENABLED
71struct udpstat {
72	                                /* input statistics: */
73	        u_long  udps_ipackets;          /* total input packets */
74	        u_long  udps_hdrops;            /* packet shorter than header */
75	        u_long  udps_badsum;            /* checksum error */
76	        u_long  udps_badlen;            /* data length larger than packet */
77	        u_long  udps_noport;            /* no socket on port */
78	        u_long  udps_noportbcast;       /* of above, arrived as broadcast */
79	        u_long  udps_fullsock;          /* not delivered, input socket full */
80	        u_long  udpps_pcbcachemiss;     /* input packets missing pcb cache */
81	                                /* output statistics: */
82	        u_long  udps_opackets;          /* total output packets */
83};
84#endif
85
86/*
87 * Names for UDP sysctl objects
88 */
89#define UDPCTL_CHECKSUM         1       /* checksum UDP packets */
90#define UDPCTL_MAXID            2
91
92#ifdef LOG_ENABLED
93extern struct udpstat udpstat;
94#endif
95
96extern struct socket udb;
97struct mbuf;
98
99void udp_init _P((void));
100void udp_input _P((register struct mbuf *, int));
101int udp_output _P((struct socket *, struct mbuf *, struct sockaddr_in *));
102int udp_attach _P((struct socket *));
103void udp_detach _P((struct socket *));
104struct socket * udp_listen _P((u_int, u_int32_t, u_int, int));
105int udp_output2(struct socket *so, struct mbuf *m,
106                struct sockaddr_in *saddr, struct sockaddr_in *daddr,
107                int iptos);
108#endif
109