[qemu.git] / slirp / udp.c

/*
 * Copyright (c) 1982, 1986, 1988, 1990, 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_usrreq.c	8.4 (Berkeley) 1/21/94
 * udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
 */

/*
 * Changes and additions relating to SLiRP
 * Copyright (c) 1995 Danny Gasparovski.
 *
 * Please read the file COPYRIGHT for the
 * terms and conditions of the copyright.
 */

#include <slirp.h>
#include "ip_icmp.h"

static uint8_t udp_tos(struct socket *so);

void
udp_init(Slirp *slirp)
{
    slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb;
    slirp->udp_last_so = &slirp->udb;
}
/* m->m_data  points at ip packet header
 * m->m_len   length ip packet
 * ip->ip_len length data (IPDU)
 */
void
udp_input(register struct mbuf *m, int iphlen)
{
	Slirp *slirp = m->slirp;
	register struct ip *ip;
	register struct udphdr *uh;
	int len;
	struct ip save_ip;
	struct socket *so;

	DEBUG_CALL("udp_input");
	DEBUG_ARG("m = %lx", (long)m);
	DEBUG_ARG("iphlen = %d", iphlen);

	/*
	 * Strip IP options, if any; should skip this,
	 * make available to user, and use on returned packets,
	 * but we don't yet have a way to check the checksum
	 * with options still present.
	 */
	if(iphlen > sizeof(struct ip)) {
		ip_stripoptions(m, (struct mbuf *)0);
		iphlen = sizeof(struct ip);
	}

	/*
	 * Get IP and UDP header together in first mbuf.
	 */
	ip = mtod(m, struct ip *);
	uh = (struct udphdr *)((caddr_t)ip + iphlen);

	/*
	 * Make mbuf data length reflect UDP length.
	 * If not enough data to reflect UDP length, drop.
	 */
	len = ntohs((uint16_t)uh->uh_ulen);

	if (ip->ip_len != len) {
		if (len > ip->ip_len) {
			goto bad;
		}
		m_adj(m, len - ip->ip_len);
		ip->ip_len = len;
	}

	/*
	 * Save a copy of the IP header in case we want restore it
	 * for sending an ICMP error message in response.
	 */
	save_ip = *ip;
	save_ip.ip_len+= iphlen;         /* tcp_input subtracts this */

	/*
	 * Checksum extended UDP header and data.
	 */
	if (uh->uh_sum) {
      memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
	  ((struct ipovly *)ip)->ih_x1 = 0;
	  ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
	  if(cksum(m, len + sizeof(struct ip))) {
	    goto bad;
	  }
	}

        /*
         *  handle DHCP/BOOTP
         */
        if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
            bootp_input(m);
            goto bad;
        }

        if (slirp->restricted) {
            goto bad;
        }

        /*
         *  handle TFTP
         */
        if (ntohs(uh->uh_dport) == TFTP_SERVER) {
            tftp_input(m);
            goto bad;
        }

	/*
	 * Locate pcb for datagram.
	 */
	so = slirp->udp_last_so;
	if (so->so_lport != uh->uh_sport ||
	    so->so_laddr.s_addr != ip->ip_src.s_addr) {
		struct socket *tmp;

		for (tmp = slirp->udb.so_next; tmp != &slirp->udb;
		     tmp = tmp->so_next) {
			if (tmp->so_lport == uh->uh_sport &&
			    tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
				so = tmp;
				break;
			}
		}
		if (tmp == &slirp->udb) {
		  so = NULL;
		} else {
		  slirp->udp_last_so = so;
		}
	}

	if (so == NULL) {
	  /*
	   * If there's no socket for this packet,
	   * create one
	   */
	  so = socreate(slirp);
	  if (!so) {
	      goto bad;
	  }
	  if(udp_attach(so) == -1) {
	    DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
			errno,strerror(errno)));
	    sofree(so);
	    goto bad;
	  }

	  /*
	   * Setup fields
	   */
	  so->so_laddr = ip->ip_src;
	  so->so_lport = uh->uh_sport;

	  if ((so->so_iptos = udp_tos(so)) == 0)
	    so->so_iptos = ip->ip_tos;

	  /*
	   * XXXXX Here, check if it's in udpexec_list,
	   * and if it is, do the fork_exec() etc.
	   */
	}

        so->so_faddr = ip->ip_dst; /* XXX */
        so->so_fport = uh->uh_dport; /* XXX */

	iphlen += sizeof(struct udphdr);
	m->m_len -= iphlen;
	m->m_data += iphlen;

	/*
	 * Now we sendto() the packet.
	 */
	if(sosendto(so,m) == -1) {
	  m->m_len += iphlen;
	  m->m_data -= iphlen;
	  *ip=save_ip;
	  DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
	  icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
	}

	m_free(so->so_m);   /* used for ICMP if error on sorecvfrom */

	/* restore the orig mbuf packet */
	m->m_len += iphlen;
	m->m_data -= iphlen;
	*ip=save_ip;
	so->so_m=m;         /* ICMP backup */

	return;
bad:
	m_freem(m);
	return;
}

int udp_output2(struct socket *so, struct mbuf *m,
                struct sockaddr_in *saddr, struct sockaddr_in *daddr,
                int iptos)
{
	register struct udpiphdr *ui;
	int error = 0;

	DEBUG_CALL("udp_output");
	DEBUG_ARG("so = %lx", (long)so);
	DEBUG_ARG("m = %lx", (long)m);
	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);

	/*
	 * Adjust for header
	 */
	m->m_data -= sizeof(struct udpiphdr);
	m->m_len += sizeof(struct udpiphdr);

	/*
	 * Fill in mbuf with extended UDP header
	 * and addresses and length put into network format.
	 */
	ui = mtod(m, struct udpiphdr *);
    memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
	ui->ui_x1 = 0;
	ui->ui_pr = IPPROTO_UDP;
	ui->ui_len = htons(m->m_len - sizeof(struct ip));
	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
        ui->ui_src = saddr->sin_addr;
	ui->ui_dst = daddr->sin_addr;
	ui->ui_sport = saddr->sin_port;
	ui->ui_dport = daddr->sin_port;
	ui->ui_ulen = ui->ui_len;

	/*
	 * Stuff checksum and output datagram.
	 */
	ui->ui_sum = 0;
	if ((ui->ui_sum = cksum(m, m->m_len)) == 0)
		ui->ui_sum = 0xffff;
	((struct ip *)ui)->ip_len = m->m_len;

	((struct ip *)ui)->ip_ttl = IPDEFTTL;
	((struct ip *)ui)->ip_tos = iptos;

	error = ip_output(so, m);

	return (error);
}

int udp_output(struct socket *so, struct mbuf *m,
               struct sockaddr_in *addr)

{
    Slirp *slirp = so->slirp;
    struct sockaddr_in saddr, daddr;

    saddr = *addr;
    if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
        slirp->vnetwork_addr.s_addr) {
        uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr;

        if ((so->so_faddr.s_addr & inv_mask) == inv_mask) {
            saddr.sin_addr = slirp->vhost_addr;
        } else if (addr->sin_addr.s_addr == loopback_addr.s_addr ||
                   so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
            saddr.sin_addr = so->so_faddr;
        }
    }
    daddr.sin_addr = so->so_laddr;
    daddr.sin_port = so->so_lport;

    return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
}

int
udp_attach(struct socket *so)
{
  if((so->s = qemu_socket(AF_INET,SOCK_DGRAM,0)) != -1) {
    so->so_expire = curtime + SO_EXPIRE;
    insque(so, &so->slirp->udb);
  }
  return(so->s);
}

void
udp_detach(struct socket *so)
{
	closesocket(so->s);
	sofree(so);
}

static const struct tos_t udptos[] = {
	{0, 53, IPTOS_LOWDELAY, 0},			/* DNS */
	{0, 0, 0, 0}
};

static uint8_t
udp_tos(struct socket *so)
{
	int i = 0;

	while(udptos[i].tos) {
		if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) ||
		    (udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
		    	so->so_emu = udptos[i].emu;
			return udptos[i].tos;
		}
		i++;
	}

	return 0;
}

struct socket *
udp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
           u_int lport, int flags)
{
	struct sockaddr_in addr;
	struct socket *so;
	socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1;

	so = socreate(slirp);
	if (!so) {
	    return NULL;
	}
	so->s = qemu_socket(AF_INET,SOCK_DGRAM,0);
	so->so_expire = curtime + SO_EXPIRE;
	insque(so, &slirp->udb);

	addr.sin_family = AF_INET;
	addr.sin_addr.s_addr = haddr;
	addr.sin_port = hport;

	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
		udp_detach(so);
		return NULL;
	}
	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));

	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
	so->so_fport = addr.sin_port;
	if (addr.sin_addr.s_addr == 0 ||
	    addr.sin_addr.s_addr == loopback_addr.s_addr) {
	   so->so_faddr = slirp->vhost_addr;
	} else {
	   so->so_faddr = addr.sin_addr;
	}
	so->so_lport = lport;
	so->so_laddr.s_addr = laddr;
	if (flags != SS_FACCEPTONCE)
	   so->so_expire = 0;

	so->so_state &= SS_PERSISTENT_MASK;
	so->so_state |= SS_ISFCONNECTED | flags;

	return so;
}
Commit	Line	Data
f0cbd3ec FB	1	/*
	2	* Copyright (c) 1982, 1986, 1988, 1990, 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.
2f5f8996	13	* 3. Neither the name of the University nor the names of its contributors
f0cbd3ec FB	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_usrreq.c 8.4 (Berkeley) 1/21/94
	30	* udp_usrreq.c,v 1.4 1994/10/02 17:48:45 phk Exp
	31	*/
	32
	33	/*
	34	* Changes and additions relating to SLiRP
	35	* Copyright (c) 1995 Danny Gasparovski.
5fafdf24 TS	36	*
5fafdf24 TS	37	* Please read the file COPYRIGHT for the
f0cbd3ec FB	38	* terms and conditions of the copyright.
	39	*/
	40
	41	#include <slirp.h>
	42	#include "ip_icmp.h"
	43
b6dce92e	44	static uint8_t udp_tos(struct socket *so);
9634d903	45
f0cbd3ec	46	void
460fec67	47	udp_init(Slirp *slirp)
f0cbd3ec	48	{
460fec67 JK	49	slirp->udb.so_next = slirp->udb.so_prev = &slirp->udb;
460fec67 JK	50	slirp->udp_last_so = &slirp->udb;
f0cbd3ec	51	}
5fafdf24 TS	52	/* m->m_data points at ip packet header
5fafdf24 TS	53	* m->m_len length ip packet
f0cbd3ec FB	54	* ip->ip_len length data (IPDU)
	55	*/
	56	void
aeed97c4	57	udp_input(register struct mbuf *m, int iphlen)
f0cbd3ec	58	{
460fec67	59	Slirp *slirp = m->slirp;
f0cbd3ec FB	60	register struct ip *ip;
f0cbd3ec FB	61	register struct udphdr *uh;
f0cbd3ec	62	int len;
5fafdf24	63	struct ip save_ip;
f0cbd3ec	64	struct socket *so;
5fafdf24	65
f0cbd3ec FB	66	DEBUG_CALL("udp_input");
	67	DEBUG_ARG("m = %lx", (long)m);
	68	DEBUG_ARG("iphlen = %d", iphlen);
5fafdf24	69
f0cbd3ec FB	70	/*
	71	* Strip IP options, if any; should skip this,
	72	* make available to user, and use on returned packets,
	73	* but we don't yet have a way to check the checksum
	74	* with options still present.
	75	*/
	76	if(iphlen > sizeof(struct ip)) {
	77	ip_stripoptions(m, (struct mbuf *)0);
	78	iphlen = sizeof(struct ip);
	79	}
	80
	81	/*
	82	* Get IP and UDP header together in first mbuf.
	83	*/
	84	ip = mtod(m, struct ip *);
	85	uh = (struct udphdr *)((caddr_t)ip + iphlen);
	86
	87	/*
	88	* Make mbuf data length reflect UDP length.
	89	* If not enough data to reflect UDP length, drop.
	90	*/
b6dce92e	91	len = ntohs((uint16_t)uh->uh_ulen);
f0cbd3ec FB	92
	93	if (ip->ip_len != len) {
	94	if (len > ip->ip_len) {
f0cbd3ec FB	95	goto bad;
	96	}
	97	m_adj(m, len - ip->ip_len);
	98	ip->ip_len = len;
	99	}
5fafdf24	100
f0cbd3ec FB	101	/*
	102	* Save a copy of the IP header in case we want restore it
	103	* for sending an ICMP error message in response.
	104	*/
5fafdf24	105	save_ip = *ip;
f0cbd3ec FB	106	save_ip.ip_len+= iphlen; /* tcp_input subtracts this */
	107
	108	/*
	109	* Checksum extended UDP header and data.
	110	*/
0d62c4cf	111	if (uh->uh_sum) {
429d0a3d	112	memset(&((struct ipovly *)ip)->ih_mbuf, 0, sizeof(struct mbuf_ptr));
f0cbd3ec FB	113	((struct ipovly *)ip)->ih_x1 = 0;
f0cbd3ec FB	114	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
f0cbd3ec	115	if(cksum(m, len + sizeof(struct ip))) {
f0cbd3ec FB	116	goto bad;
	117	}
	118	}
	119
	120	/*
	121	* handle DHCP/BOOTP
	122	*/
	123	if (ntohs(uh->uh_dport) == BOOTP_SERVER) {
	124	bootp_input(m);
	125	goto bad;
	126	}
	127
460fec67	128	if (slirp->restricted) {
a9ba3a85	129	goto bad;
460fec67	130	}
a9ba3a85	131
c7f74643 FB	132	/*
	133	* handle TFTP
	134	*/
	135	if (ntohs(uh->uh_dport) == TFTP_SERVER) {
	136	tftp_input(m);
	137	goto bad;
	138	}
	139
f0cbd3ec FB	140	/*
	141	* Locate pcb for datagram.
	142	*/
460fec67	143	so = slirp->udp_last_so;
f0cbd3ec FB	144	if (so->so_lport != uh->uh_sport \|\|
	145	so->so_laddr.s_addr != ip->ip_src.s_addr) {
	146	struct socket *tmp;
3b46e624	147
460fec67 JK	148	for (tmp = slirp->udb.so_next; tmp != &slirp->udb;
460fec67 JK	149	tmp = tmp->so_next) {
f0cbd3ec FB	150	if (tmp->so_lport == uh->uh_sport &&
f0cbd3ec FB	151	tmp->so_laddr.s_addr == ip->ip_src.s_addr) {
f0cbd3ec FB	152	so = tmp;
	153	break;
	154	}
	155	}
460fec67	156	if (tmp == &slirp->udb) {
f0cbd3ec FB	157	so = NULL;
f0cbd3ec FB	158	} else {
460fec67	159	slirp->udp_last_so = so;
f0cbd3ec FB	160	}
f0cbd3ec FB	161	}
5fafdf24	162
f0cbd3ec FB	163	if (so == NULL) {
	164	/*
	165	* If there's no socket for this packet,
	166	* create one
	167	*/
460fec67 JK	168	so = socreate(slirp);
	169	if (!so) {
	170	goto bad;
	171	}
f0cbd3ec	172	if(udp_attach(so) == -1) {
5fafdf24	173	DEBUG_MISC((dfd," udp_attach errno = %d-%s\n",
f0cbd3ec FB	174	errno,strerror(errno)));
	175	sofree(so);
	176	goto bad;
	177	}
3b46e624	178
f0cbd3ec FB	179	/*
	180	* Setup fields
	181	*/
f0cbd3ec FB	182	so->so_laddr = ip->ip_src;
f0cbd3ec FB	183	so->so_lport = uh->uh_sport;
3b46e624	184
f0cbd3ec FB	185	if ((so->so_iptos = udp_tos(so)) == 0)
f0cbd3ec FB	186	so->so_iptos = ip->ip_tos;
3b46e624	187
f0cbd3ec FB	188	/*
	189	* XXXXX Here, check if it's in udpexec_list,
	190	* and if it is, do the fork_exec() etc.
	191	*/
	192	}
	193
54fd9cdf TS	194	so->so_faddr = ip->ip_dst; /* XXX */
	195	so->so_fport = uh->uh_dport; /* XXX */
	196
f0cbd3ec FB	197	iphlen += sizeof(struct udphdr);
	198	m->m_len -= iphlen;
	199	m->m_data += iphlen;
	200
	201	/*
	202	* Now we sendto() the packet.
	203	*/
f0cbd3ec FB	204	if(sosendto(so,m) == -1) {
	205	m->m_len += iphlen;
	206	m->m_data -= iphlen;
	207	*ip=save_ip;
	208	DEBUG_MISC((dfd,"udp tx errno = %d-%s\n",errno,strerror(errno)));
3b46e624	209	icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
f0cbd3ec FB	210	}
	211
	212	m_free(so->so_m); /* used for ICMP if error on sorecvfrom */
	213
	214	/* restore the orig mbuf packet */
	215	m->m_len += iphlen;
	216	m->m_data -= iphlen;
	217	*ip=save_ip;
	218	so->so_m=m; /* ICMP backup */
	219
	220	return;
	221	bad:
	222	m_freem(m);
f0cbd3ec FB	223	return;
	224	}
	225
5fafdf24	226	int udp_output2(struct socket so, struct mbuf m,
f0cbd3ec FB	227	struct sockaddr_in saddr, struct sockaddr_in daddr,
	228	int iptos)
	229	{
	230	register struct udpiphdr *ui;
	231	int error = 0;
	232
	233	DEBUG_CALL("udp_output");
	234	DEBUG_ARG("so = %lx", (long)so);
	235	DEBUG_ARG("m = %lx", (long)m);
	236	DEBUG_ARG("saddr = %lx", (long)saddr->sin_addr.s_addr);
	237	DEBUG_ARG("daddr = %lx", (long)daddr->sin_addr.s_addr);
	238
	239	/*
	240	* Adjust for header
	241	*/
	242	m->m_data -= sizeof(struct udpiphdr);
	243	m->m_len += sizeof(struct udpiphdr);
5fafdf24	244
f0cbd3ec FB	245	/*
	246	* Fill in mbuf with extended UDP header
	247	* and addresses and length put into network format.
	248	*/
	249	ui = mtod(m, struct udpiphdr *);
429d0a3d	250	memset(&ui->ui_i.ih_mbuf, 0 , sizeof(struct mbuf_ptr));
f0cbd3ec FB	251	ui->ui_x1 = 0;
f0cbd3ec FB	252	ui->ui_pr = IPPROTO_UDP;
0d62c4cf	253	ui->ui_len = htons(m->m_len - sizeof(struct ip));
f0cbd3ec FB	254	/* XXXXX Check for from-one-location sockets, or from-any-location sockets */
	255	ui->ui_src = saddr->sin_addr;
	256	ui->ui_dst = daddr->sin_addr;
	257	ui->ui_sport = saddr->sin_port;
	258	ui->ui_dport = daddr->sin_port;
	259	ui->ui_ulen = ui->ui_len;
	260
	261	/*
	262	* Stuff checksum and output datagram.
	263	*/
	264	ui->ui_sum = 0;
0d62c4cf	265	if ((ui->ui_sum = cksum(m, m->m_len)) == 0)
f0cbd3ec	266	ui->ui_sum = 0xffff;
f0cbd3ec FB	267	((struct ip *)ui)->ip_len = m->m_len;
f0cbd3ec FB	268
9634d903	269	((struct ip *)ui)->ip_ttl = IPDEFTTL;
f0cbd3ec	270	((struct ip *)ui)->ip_tos = iptos;
5fafdf24	271
f0cbd3ec	272	error = ip_output(so, m);
5fafdf24	273
f0cbd3ec FB	274	return (error);
	275	}
	276
5fafdf24	277	int udp_output(struct socket so, struct mbuf m,
f0cbd3ec FB	278	struct sockaddr_in *addr)
	279
	280	{
460fec67	281	Slirp *slirp = so->slirp;
f0cbd3ec FB	282	struct sockaddr_in saddr, daddr;
	283
	284	saddr = *addr;
460fec67 JK	285	if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) ==
	286	slirp->vnetwork_addr.s_addr) {
	287	uint32_t inv_mask = ~slirp->vnetwork_mask.s_addr;
	288
	289	if ((so->so_faddr.s_addr & inv_mask) == inv_mask) {
	290	saddr.sin_addr = slirp->vhost_addr;
a13a4126	291	} else if (addr->sin_addr.s_addr == loopback_addr.s_addr \|\|
460fec67	292	so->so_faddr.s_addr != slirp->vhost_addr.s_addr) {
a13a4126 JK	293	saddr.sin_addr = so->so_faddr;
a13a4126 JK	294	}
c904d61f	295	}
f0cbd3ec FB	296	daddr.sin_addr = so->so_laddr;
f0cbd3ec FB	297	daddr.sin_port = so->so_lport;
3b46e624	298
f0cbd3ec FB	299	return udp_output2(so, m, &saddr, &daddr, so->so_iptos);
	300	}
	301
	302	int
aeed97c4	303	udp_attach(struct socket *so)
f0cbd3ec	304	{
40ff6d7e	305	if((so->s = qemu_socket(AF_INET,SOCK_DGRAM,0)) != -1) {
97df1ee5 ES	306	so->so_expire = curtime + SO_EXPIRE;
97df1ee5 ES	307	insque(so, &so->slirp->udb);
f0cbd3ec FB	308	}
	309	return(so->s);
	310	}
	311
	312	void
aeed97c4	313	udp_detach(struct socket *so)
f0cbd3ec	314	{
379ff53d	315	closesocket(so->s);
f0cbd3ec FB	316	sofree(so);
	317	}
	318
9634d903	319	static const struct tos_t udptos[] = {
f0cbd3ec	320	{0, 53, IPTOS_LOWDELAY, 0}, /* DNS */
f0cbd3ec FB	321	{0, 0, 0, 0}
	322	};
	323
b6dce92e	324	static uint8_t
9634d903	325	udp_tos(struct socket *so)
f0cbd3ec FB	326	{
f0cbd3ec FB	327	int i = 0;
5fafdf24	328
f0cbd3ec FB	329	while(udptos[i].tos) {
	330	if ((udptos[i].fport && ntohs(so->so_fport) == udptos[i].fport) \|\|
	331	(udptos[i].lport && ntohs(so->so_lport) == udptos[i].lport)) {
	332	so->so_emu = udptos[i].emu;
	333	return udptos[i].tos;
	334	}
	335	i++;
	336	}
5fafdf24	337
f0cbd3ec FB	338	return 0;
	339	}
	340
f0cbd3ec	341	struct socket *
b6dce92e	342	udp_listen(Slirp *slirp, uint32_t haddr, u_int hport, uint32_t laddr,
460fec67	343	u_int lport, int flags)
f0cbd3ec FB	344	{
	345	struct sockaddr_in addr;
	346	struct socket *so;
242acf3a	347	socklen_t addrlen = sizeof(struct sockaddr_in), opt = 1;
5fafdf24	348
460fec67 JK	349	so = socreate(slirp);
	350	if (!so) {
	351	return NULL;
f0cbd3ec	352	}
40ff6d7e	353	so->s = qemu_socket(AF_INET,SOCK_DGRAM,0);
f0cbd3ec	354	so->so_expire = curtime + SO_EXPIRE;
460fec67	355	insque(so, &slirp->udb);
f0cbd3ec FB	356
f0cbd3ec FB	357	addr.sin_family = AF_INET;
3c6a0580 JK	358	addr.sin_addr.s_addr = haddr;
3c6a0580 JK	359	addr.sin_port = hport;
f0cbd3ec FB	360
	361	if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) {
	362	udp_detach(so);
	363	return NULL;
	364	}
	365	setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int));
5fafdf24	366
f0cbd3ec FB	367	getsockname(so->s,(struct sockaddr *)&addr,&addrlen);
f0cbd3ec FB	368	so->so_fport = addr.sin_port;
a13a4126 JK	369	if (addr.sin_addr.s_addr == 0 \|\|
a13a4126 JK	370	addr.sin_addr.s_addr == loopback_addr.s_addr) {
460fec67	371	so->so_faddr = slirp->vhost_addr;
a13a4126	372	} else {
f0cbd3ec	373	so->so_faddr = addr.sin_addr;
a13a4126	374	}
f0cbd3ec FB	375	so->so_lport = lport;
	376	so->so_laddr.s_addr = laddr;
	377	if (flags != SS_FACCEPTONCE)
	378	so->so_expire = 0;
5fafdf24	379
f932b6ce	380	so->so_state &= SS_PERSISTENT_MASK;
6dd5ffb6	381	so->so_state \|= SS_ISFCONNECTED \| flags;
5fafdf24	382
f0cbd3ec FB	383	return so;
f0cbd3ec FB	384	}