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      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 
     39 extern struct socket *udp_last_so;
     40 
     41 /*
     42  * Udp protocol header.
     43  * Per RFC 768, September, 1981.
     44  */
     45 struct 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  */
     55 struct 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
     71 struct 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
     93 extern struct udpstat udpstat;
     94 #endif
     95 
     96 extern struct socket udb;
     97 struct mbuf;
     98 
     99 void udp_init _P((void));
    100 void udp_input _P((register struct mbuf *, int));
    101 int udp_output _P((struct socket *, struct mbuf *, struct sockaddr_in *));
    102 int udp_attach _P((struct socket *));
    103 void udp_detach _P((struct socket *));
    104 struct socket * udp_listen _P((u_int, u_int32_t, u_int, int));
    105 int udp_output2(struct socket *so, struct mbuf *m,
    106                 struct sockaddr_in *saddr, struct sockaddr_in *daddr,
    107                 int iptos);
    108 #endif
    109