src/udp.h

/* SPDX-License-Identifier: BSD-3-Clause */
/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)udp.h	8.1 (Berkeley) 6/10/93
 * udp.h,v 1.3 1994/08/21 05:27:41 paul Exp
 */

#ifndef UDP_H
#define UDP_H

#include "socket.h"

#define UDP_TTL 0x60

/*
 * Udp protocol header.
 * Per RFC 768, September, 1981.
 */
struct udphdr {
    uint16_t uh_sport; /* source port */
    uint16_t uh_dport; /* destination port */
    int16_t uh_ulen; /* udp length */
    uint16_t uh_sum; /* udp checksum */
};

/*
 * UDP kernel structures and variables.
 */
struct udpiphdr {
    struct ipovly ui_i; /* overlaid ip structure */
    struct udphdr ui_u; /* udp header */
};
#define ui_mbuf ui_i.ih_mbuf.mptr
#define ui_x1 ui_i.ih_x1
#define ui_pr ui_i.ih_pr
#define ui_len ui_i.ih_len
#define ui_src ui_i.ih_src
#define ui_dst ui_i.ih_dst
#define ui_sport ui_u.uh_sport
#define ui_dport ui_u.uh_dport
#define ui_ulen ui_u.uh_ulen
#define ui_sum ui_u.uh_sum

/*
 * Names for UDP sysctl objects
 */
#define UDPCTL_CHECKSUM 1 /* checksum UDP packets */
#define UDPCTL_MAXID 2

struct mbuf;

/* Called from slirp_init */
void udp_init(Slirp *);
/* Called from slirp_cleanup */
void udp_cleanup(Slirp *);
/* Process UDP datagram coming from the guest */
void udp_input(register struct mbuf *, int);
/* Create a host UDP socket, bound to this socket */
int udp_attach(struct socket *, unsigned short af);
/* Destroy socket */
void udp_detach(struct socket *);

/* Listen for incoming UDP datagrams on this haddr+hport */
struct socket *udp_listen(Slirp *, uint32_t haddr, unsigned hport, uint32_t laddr, unsigned lport, int flags);
/* Listen for incoming UDP datagrams on this haddr */
struct socket *udpx_listen(Slirp *,
                           const struct sockaddr *haddr, socklen_t haddrlen,
                           const struct sockaddr *laddr, socklen_t laddrlen,
                           int flags);
/* Send UDP datagram to the guest */
int udp_output(struct socket *so, struct mbuf *m, struct sockaddr_in *saddr,
               struct sockaddr_in *daddr, int iptos);

/* Process UDPv6 datagram coming from the guest */
void udp6_input(register struct mbuf *);
/* Send UDPv6 datagram to the guest */
int udp6_output(struct socket *so, struct mbuf *m, struct sockaddr_in6 *saddr,
                struct sockaddr_in6 *daddr);

#endif