[unix-history] / sys / netinet / udp_usrreq.c

/*
 * Copyright (c) 1982, 1986, 1988, 1990 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 *
 *	from: @(#)udp_usrreq.c	7.20 (Berkeley) 4/20/91
 *	$Id: udp_usrreq.c,v 1.3 1993/11/07 17:48:14 wollman Exp $
 */

#include "param.h"
#include "malloc.h"
#include "mbuf.h"
#include "protosw.h"
#include "socket.h"
#include "socketvar.h"
#include "stat.h"

#include "../net/if.h"
#include "../net/route.h"

#include "in.h"
#include "in_systm.h"
#include "ip.h"
#include "in_pcb.h"
#include "ip_var.h"
#include "ip_icmp.h"
#include "udp.h"
#include "udp_var.h"

struct	inpcb udb;
struct	udpstat udpstat;

struct	inpcb *udp_last_inpcb = &udb;

/*
 * UDP protocol implementation.
 * Per RFC 768, August, 1980.
 */
udp_init()
{

	udb.inp_next = udb.inp_prev = &udb;
}

#ifndef	COMPAT_42
int	udpcksum = 1;
#else
int	udpcksum = 0;		/* XXX */
#endif
int	udp_ttl = UDP_TTL;

struct	sockaddr_in udp_in = { sizeof(udp_in), AF_INET };

udp_input(m, iphlen)
	register struct mbuf *m;
	int iphlen;
{
	register struct ip *ip;
	register struct udphdr *uh;
	register struct inpcb *inp;
	struct mbuf *opts = 0;
	int len;
	struct ip save_ip;

	udpstat.udps_ipackets++;

	/*
	 * 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 *);
	if (m->m_len < iphlen + sizeof(struct udphdr)) {
		if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
			udpstat.udps_hdrops++;
			return;
		}
		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((u_short)uh->uh_ulen);
	if (ip->ip_len != len) {
		if (len > ip->ip_len) {
			udpstat.udps_badlen++;
			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;

	/*
	 * Checksum extended UDP header and data.
	 */
	if (udpcksum && uh->uh_sum) {
		((struct ipovly *)ip)->ih_next = 0;
		((struct ipovly *)ip)->ih_prev = 0;
		((struct ipovly *)ip)->ih_x1 = 0;
		((struct ipovly *)ip)->ih_len = uh->uh_ulen;
		if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
			udpstat.udps_badsum++;
			m_freem(m);
			return;
		}
	}

	/*
	 * Locate pcb for datagram.
	 */
	inp = udp_last_inpcb;
	if (inp->inp_lport != uh->uh_dport ||
	    inp->inp_fport != uh->uh_sport ||
	    inp->inp_faddr.s_addr != ip->ip_src.s_addr ||
	    inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
		inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
		    ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
		if (inp)
			udp_last_inpcb = inp;
		udpstat.udpps_pcbcachemiss++;
	}
	if (inp == 0) {
		/* don't send ICMP response for broadcast packet */
		udpstat.udps_noport++;
		if (m->m_flags & M_BCAST) {
			udpstat.udps_noportbcast++;
			goto bad;
		}
		*ip = save_ip;
		ip->ip_len += iphlen;
		{
		  static struct in_addr fake;
		  icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, fake, 0);
		}
		return;
	}

	/*
	 * Construct sockaddr format source address.
	 * Stuff source address and datagram in user buffer.
	 */
	udp_in.sin_port = uh->uh_sport;
	udp_in.sin_addr = ip->ip_src;
	if (inp->inp_flags & INP_CONTROLOPTS) {
		struct mbuf **mp = &opts;
		struct mbuf *udp_saveopt();

		if (inp->inp_flags & INP_RECVDSTADDR) {
			*mp = udp_saveopt((caddr_t) &ip->ip_dst,
			    sizeof(struct in_addr), IP_RECVDSTADDR);
			if (*mp)
				mp = &(*mp)->m_next;
		}
#ifdef notyet
		/* options were tossed above */
		if (inp->inp_flags & INP_RECVOPTS) {
			*mp = udp_saveopt((caddr_t) opts_deleted_above,
			    sizeof(struct in_addr), IP_RECVOPTS);
			if (*mp)
				mp = &(*mp)->m_next;
		}
		/* ip_srcroute doesn't do what we want here, need to fix */
		if (inp->inp_flags & INP_RECVRETOPTS) {
			*mp = udp_saveopt((caddr_t) ip_srcroute(),
			    sizeof(struct in_addr), IP_RECVRETOPTS);
			if (*mp)
				mp = &(*mp)->m_next;
		}
#endif
	}
	iphlen += sizeof(struct udphdr);
	m->m_len -= iphlen;
	m->m_pkthdr.len -= iphlen;
	m->m_data += iphlen;
	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
	    m, opts) == 0) {
		udpstat.udps_fullsock++;
		goto bad;
	}
	sorwakeup(inp->inp_socket);
	return;
bad:
	m_freem(m);
	if (opts)
		m_freem(opts);
}

/*
 * Create a "control" mbuf containing the specified data
 * with the specified type for presentation with a datagram.
 */
struct mbuf *
udp_saveopt(p, size, type)
	caddr_t p;
	register int size;
	int type;
{
	register struct cmsghdr *cp;
	struct mbuf *m;

	if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
		return ((struct mbuf *) NULL);
	cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
	bcopy(p, (caddr_t)(cp + 1), size);
	size += sizeof(*cp);
	m->m_len = size;
	cp->cmsg_len = size;
	cp->cmsg_level = IPPROTO_IP;
	cp->cmsg_type = type;
	return (m);
}

/*
 * Notify a udp user of an asynchronous error;
 * just wake up so that he can collect error status.
 */
udp_notify(inp, errno)
	register struct inpcb *inp;
{

	inp->inp_socket->so_error = errno;
	sorwakeup(inp->inp_socket);
	sowwakeup(inp->inp_socket);
}

udp_ctlinput(cmd, sa, ip)
	int cmd;
	struct sockaddr *sa;
	register struct ip *ip;
{
	register struct udphdr *uh;
	extern struct in_addr zeroin_addr;
	extern u_char inetctlerrmap[];

	if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
		return;
	if (ip) {
		uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
		in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
			cmd, udp_notify);
	} else
		in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
}

udp_output(inp, m, addr, control)
	register struct inpcb *inp;
	register struct mbuf *m;
	struct mbuf *addr, *control;
{
	register struct udpiphdr *ui;
	register int len = m->m_pkthdr.len;
	struct in_addr laddr;
	int s, error = 0;

	if (control)
		m_freem(control);		/* XXX */

	if (addr) {
		laddr = inp->inp_laddr;
		if (inp->inp_faddr.s_addr != INADDR_ANY) {
			error = EISCONN;
			goto release;
		}
		/*
		 * Must block input while temporarily connected.
		 */
		s = splnet();
		error = in_pcbconnect(inp, addr);
		if (error) {
			splx(s);
			goto release;
		}
	} else {
		if (inp->inp_faddr.s_addr == INADDR_ANY) {
			error = ENOTCONN;
			goto release;
		}
	}
	/*
	 * Calculate data length and get a mbuf
	 * for UDP and IP headers.
	 */
	M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);

	/*
	 * Fill in mbuf with extended UDP header
	 * and addresses and length put into network format.
	 */
	ui = mtod(m, struct udpiphdr *);
	ui->ui_next = ui->ui_prev = 0;
	ui->ui_x1 = 0;
	ui->ui_pr = IPPROTO_UDP;
	ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
	ui->ui_src = inp->inp_laddr;
	ui->ui_dst = inp->inp_faddr;
	ui->ui_sport = inp->inp_lport;
	ui->ui_dport = inp->inp_fport;
	ui->ui_ulen = ui->ui_len;

	/*
	 * Stuff checksum and output datagram.
	 */
	ui->ui_sum = 0;
	if (udpcksum) {
	    if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
		ui->ui_sum = 0xffff;
	}
	((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
	((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl;	/* XXX */
	((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos;	/* XXX */
	udpstat.udps_opackets++;
	error = ip_output(m, inp->inp_options, &inp->inp_route,
	    inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST));

	if (addr) {
		in_pcbdisconnect(inp);
		inp->inp_laddr = laddr;
		splx(s);
	}
	return (error);

release:
	m_freem(m);
	return (error);
}

u_long	udp_sendspace = 9216;		/* really max datagram size */
u_long	udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
					/* 40 1K datagrams */

/*ARGSUSED*/
udp_usrreq(so, req, m, addr, control)
	struct socket *so;
	int req;
	struct mbuf *m, *addr, *control;
{
	struct inpcb *inp = sotoinpcb(so);
	int error = 0;
	int s;

	if (req == PRU_CONTROL)
		return (in_control(so, (int)m, (caddr_t)addr,
			(struct ifnet *)control));
	if (inp == NULL && req != PRU_ATTACH) {
		error = EINVAL;
		goto release;
	}
	/*
	 * Note: need to block udp_input while changing
	 * the udp pcb queue and/or pcb addresses.
	 */
	switch (req) {

	case PRU_ATTACH:
		if (inp != NULL) {
			error = EINVAL;
			break;
		}
		s = splnet();
		error = in_pcballoc(so, &udb);
		splx(s);
		if (error)
			break;
		error = soreserve(so, udp_sendspace, udp_recvspace);
		if (error)
			break;
		((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
		break;

	case PRU_DETACH:
		udp_detach(inp);
		break;

	case PRU_BIND:
		s = splnet();
		error = in_pcbbind(inp, addr);
		splx(s);
		break;

	case PRU_LISTEN:
		error = EOPNOTSUPP;
		break;

	case PRU_CONNECT:
		if (inp->inp_faddr.s_addr != INADDR_ANY) {
			error = EISCONN;
			break;
		}
		s = splnet();
		error = in_pcbconnect(inp, addr);
		splx(s);
		if (error == 0)
			soisconnected(so);
		break;

	case PRU_CONNECT2:
		error = EOPNOTSUPP;
		break;

	case PRU_ACCEPT:
		error = EOPNOTSUPP;
		break;

	case PRU_DISCONNECT:
		if (inp->inp_faddr.s_addr == INADDR_ANY) {
			error = ENOTCONN;
			break;
		}
		s = splnet();
		in_pcbdisconnect(inp);
		inp->inp_laddr.s_addr = INADDR_ANY;
		splx(s);
		so->so_state &= ~SS_ISCONNECTED;		/* XXX */
		break;

	case PRU_SHUTDOWN:
		socantsendmore(so);
		break;

	case PRU_SEND:
		return (udp_output(inp, m, addr, control));

	case PRU_ABORT:
		soisdisconnected(so);
		udp_detach(inp);
		break;

	case PRU_SOCKADDR:
		in_setsockaddr(inp, addr);
		break;

	case PRU_PEERADDR:
		in_setpeeraddr(inp, addr);
		break;

	case PRU_SENSE:
		/*
		 * stat: don't bother with a blocksize.
		 */
		return (0);

	case PRU_SENDOOB:
	case PRU_FASTTIMO:
	case PRU_SLOWTIMO:
	case PRU_PROTORCV:
	case PRU_PROTOSEND:
		error =  EOPNOTSUPP;
		break;

	case PRU_RCVD:
	case PRU_RCVOOB:
		return (EOPNOTSUPP);	/* do not free mbuf's */

	default:
		panic("udp_usrreq");
	}

release:
	if (control) {
		printf("udp control data unexpectedly retained\n");
		m_freem(control);
	}
	if (m)
		m_freem(m);
	return (error);
}

udp_detach(inp)
	struct inpcb *inp;
{
	int s = splnet();

	if (inp == udp_last_inpcb)
		udp_last_inpcb = &udb;
	in_pcbdetach(inp);
	splx(s);
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1982, 1986, 1988, 1990 Regents of the University of California.
	3	* 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. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
38e82238	33	* from: @(#)udp_usrreq.c 7.20 (Berkeley) 4/20/91
2cb63509	34	* $Id: udp_usrreq.c,v 1.3 1993/11/07 17:48:14 wollman Exp $
15637ed4 RG	35	*/
	36
	37	#include "param.h"
	38	#include "malloc.h"
	39	#include "mbuf.h"
	40	#include "protosw.h"
	41	#include "socket.h"
	42	#include "socketvar.h"
	43	#include "stat.h"
	44
	45	#include "../net/if.h"
	46	#include "../net/route.h"
	47
	48	#include "in.h"
	49	#include "in_systm.h"
	50	#include "ip.h"
	51	#include "in_pcb.h"
	52	#include "ip_var.h"
	53	#include "ip_icmp.h"
	54	#include "udp.h"
	55	#include "udp_var.h"
	56
8ace4366 GW	57	struct inpcb udb;
	58	struct udpstat udpstat;
	59
15637ed4 RG	60	struct inpcb *udp_last_inpcb = &udb;
	61
	62	/*
	63	* UDP protocol implementation.
	64	* Per RFC 768, August, 1980.
	65	*/
	66	udp_init()
	67	{
	68
	69	udb.inp_next = udb.inp_prev = &udb;
	70	}
	71
	72	#ifndef COMPAT_42
	73	int udpcksum = 1;
	74	#else
	75	int udpcksum = 0; /* XXX */
	76	#endif
	77	int udp_ttl = UDP_TTL;
	78
	79	struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
	80
	81	udp_input(m, iphlen)
	82	register struct mbuf *m;
	83	int iphlen;
	84	{
	85	register struct ip *ip;
	86	register struct udphdr *uh;
	87	register struct inpcb *inp;
	88	struct mbuf *opts = 0;
	89	int len;
	90	struct ip save_ip;
	91
	92	udpstat.udps_ipackets++;
	93
	94	/*
	95	* Strip IP options, if any; should skip this,
	96	* make available to user, and use on returned packets,
	97	* but we don't yet have a way to check the checksum
	98	* with options still present.
	99	*/
	100	if (iphlen > sizeof (struct ip)) {
	101	ip_stripoptions(m, (struct mbuf *)0);
	102	iphlen = sizeof(struct ip);
	103	}
	104
	105	/*
	106	* Get IP and UDP header together in first mbuf.
	107	*/
	108	ip = mtod(m, struct ip *);
	109	if (m->m_len < iphlen + sizeof(struct udphdr)) {
	110	if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
	111	udpstat.udps_hdrops++;
	112	return;
	113	}
	114	ip = mtod(m, struct ip *);
	115	}
	116	uh = (struct udphdr *)((caddr_t)ip + iphlen);
	117
	118	/*
	119	* Make mbuf data length reflect UDP length.
	120	* If not enough data to reflect UDP length, drop.
	121	*/
	122	len = ntohs((u_short)uh->uh_ulen);
	123	if (ip->ip_len != len) {
124	if (len > ip->ip_len) {
125	udpstat.udps_badlen++;
126	goto bad;
127	}
128	m_adj(m, len - ip->ip_len);
129	/* ip->ip_len = len; */
130	}
131	/*
132	* Save a copy of the IP header in case we want restore it
133	* for sending an ICMP error message in response.
134	*/
135	save_ip = *ip;
136
137	/*
138	* Checksum extended UDP header and data.
139	*/
140	if (udpcksum && uh->uh_sum) {
141	((struct ipovly *)ip)->ih_next = 0;
142	((struct ipovly *)ip)->ih_prev = 0;
143	((struct ipovly *)ip)->ih_x1 = 0;
144	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
145	if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
146	udpstat.udps_badsum++;
147	m_freem(m);
148	return;
149	}
150	}
151
152	/*
153	* Locate pcb for datagram.
154	*/
155	inp = udp_last_inpcb;
156	if (inp->inp_lport != uh->uh_dport \|\|
157	inp->inp_fport != uh->uh_sport \|\|
158	inp->inp_faddr.s_addr != ip->ip_src.s_addr \|\|
159	inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
160	inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
161	ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
162	if (inp)
163	udp_last_inpcb = inp;
164	udpstat.udpps_pcbcachemiss++;
165	}
166	if (inp == 0) {
167	/* don't send ICMP response for broadcast packet */
168	udpstat.udps_noport++;
169	if (m->m_flags & M_BCAST) {
170	udpstat.udps_noportbcast++;
171	goto bad;
172	}
173	*ip = save_ip;
174	ip->ip_len += iphlen;
2cb63509 GW	175	{
	176	static struct in_addr fake;
	177	icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, fake, 0);
	178	}
15637ed4 RG	179	return;
	180	}
	181
	182	/*
	183	* Construct sockaddr format source address.
	184	* Stuff source address and datagram in user buffer.
	185	*/
	186	udp_in.sin_port = uh->uh_sport;
	187	udp_in.sin_addr = ip->ip_src;
	188	if (inp->inp_flags & INP_CONTROLOPTS) {
	189	struct mbuf **mp = &opts;
	190	struct mbuf *udp_saveopt();
	191
	192	if (inp->inp_flags & INP_RECVDSTADDR) {
	193	*mp = udp_saveopt((caddr_t) &ip->ip_dst,
	194	sizeof(struct in_addr), IP_RECVDSTADDR);
	195	if (*mp)
	196	mp = &(*mp)->m_next;
	197	}
	198	#ifdef notyet
	199	/* options were tossed above */
	200	if (inp->inp_flags & INP_RECVOPTS) {
	201	*mp = udp_saveopt((caddr_t) opts_deleted_above,
	202	sizeof(struct in_addr), IP_RECVOPTS);
	203	if (*mp)
	204	mp = &(*mp)->m_next;
	205	}
	206	/* ip_srcroute doesn't do what we want here, need to fix */
	207	if (inp->inp_flags & INP_RECVRETOPTS) {
	208	*mp = udp_saveopt((caddr_t) ip_srcroute(),
	209	sizeof(struct in_addr), IP_RECVRETOPTS);
	210	if (*mp)
	211	mp = &(*mp)->m_next;
	212	}
	213	#endif
	214	}
	215	iphlen += sizeof(struct udphdr);
	216	m->m_len -= iphlen;
	217	m->m_pkthdr.len -= iphlen;
	218	m->m_data += iphlen;
	219	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
	220	m, opts) == 0) {
	221	udpstat.udps_fullsock++;
	222	goto bad;
	223	}
	224	sorwakeup(inp->inp_socket);
	225	return;
	226	bad:
	227	m_freem(m);
	228	if (opts)
	229	m_freem(opts);
	230	}
	231
	232	/*
	233	* Create a "control" mbuf containing the specified data
	234	* with the specified type for presentation with a datagram.
	235	*/
	236	struct mbuf *
	237	udp_saveopt(p, size, type)
	238	caddr_t p;
	239	register int size;
	240	int type;
	241	{
	242	register struct cmsghdr *cp;
243	struct mbuf *m;
244
245	if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
246	return ((struct mbuf *) NULL);
247	cp = (struct cmsghdr ) mtod(m, struct cmsghdr );
248	bcopy(p, (caddr_t)(cp + 1), size);
249	size += sizeof(*cp);
250	m->m_len = size;
251	cp->cmsg_len = size;
252	cp->cmsg_level = IPPROTO_IP;
253	cp->cmsg_type = type;
254	return (m);
255	}
256
257	/*
258	* Notify a udp user of an asynchronous error;
259	* just wake up so that he can collect error status.
260	*/
261	udp_notify(inp, errno)
262	register struct inpcb *inp;
263	{
264
265	inp->inp_socket->so_error = errno;
266	sorwakeup(inp->inp_socket);
267	sowwakeup(inp->inp_socket);
268	}
269
270	udp_ctlinput(cmd, sa, ip)
271	int cmd;
272	struct sockaddr *sa;
273	register struct ip *ip;
274	{
275	register struct udphdr *uh;
276	extern struct in_addr zeroin_addr;
277	extern u_char inetctlerrmap[];
278
279	if ((unsigned)cmd > PRC_NCMDS \|\| inetctlerrmap[cmd] == 0)
280	return;
281	if (ip) {
282	uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
283	in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
284	cmd, udp_notify);
285	} else
286	in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
287	}
288
289	udp_output(inp, m, addr, control)
290	register struct inpcb *inp;
291	register struct mbuf *m;
292	struct mbuf addr, control;
293	{
294	register struct udpiphdr *ui;
295	register int len = m->m_pkthdr.len;
296	struct in_addr laddr;
297	int s, error = 0;
298
299	if (control)
300	m_freem(control); /* XXX */
301
302	if (addr) {
303	laddr = inp->inp_laddr;
304	if (inp->inp_faddr.s_addr != INADDR_ANY) {
305	error = EISCONN;
306	goto release;
307	}
308	/*
309	* Must block input while temporarily connected.
310	*/
311	s = splnet();
312	error = in_pcbconnect(inp, addr);
313	if (error) {
314	splx(s);
315	goto release;
316	}
317	} else {
318	if (inp->inp_faddr.s_addr == INADDR_ANY) {
319	error = ENOTCONN;
320	goto release;
321	}
322	}
323	/*
324	* Calculate data length and get a mbuf
325	* for UDP and IP headers.
326	*/
327	M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);
328
329	/*
330	* Fill in mbuf with extended UDP header
331	* and addresses and length put into network format.
332	*/
333	ui = mtod(m, struct udpiphdr *);
334	ui->ui_next = ui->ui_prev = 0;
335	ui->ui_x1 = 0;
336	ui->ui_pr = IPPROTO_UDP;
337	ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
338	ui->ui_src = inp->inp_laddr;
339	ui->ui_dst = inp->inp_faddr;
340	ui->ui_sport = inp->inp_lport;
341	ui->ui_dport = inp->inp_fport;
342	ui->ui_ulen = ui->ui_len;
343
344	/*
345	* Stuff checksum and output datagram.
346	*/
347	ui->ui_sum = 0;
348	if (udpcksum) {
349	if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
350	ui->ui_sum = 0xffff;
351	}
352	((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
353	((struct ip )ui)->ip_ttl = inp->inp_ip.ip_ttl; / XXX */
354	((struct ip )ui)->ip_tos = inp->inp_ip.ip_tos; / XXX */
355	udpstat.udps_opackets++;
356	error = ip_output(m, inp->inp_options, &inp->inp_route,
357	inp->inp_socket->so_options & (SO_DONTROUTE \| SO_BROADCAST));
358
359	if (addr) {
360	in_pcbdisconnect(inp);
361	inp->inp_laddr = laddr;
362	splx(s);
363	}
364	return (error);
365
366	release:
367	m_freem(m);
368	return (error);
369	}
370
371	u_long udp_sendspace = 9216; /* really max datagram size */
372	u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
373	/* 40 1K datagrams */
374
375	/ARGSUSED/
376	udp_usrreq(so, req, m, addr, control)
377	struct socket *so;
378	int req;
379	struct mbuf m, addr, *control;
380	{
381	struct inpcb *inp = sotoinpcb(so);
382	int error = 0;
383	int s;
384
385	if (req == PRU_CONTROL)
386	return (in_control(so, (int)m, (caddr_t)addr,
387	(struct ifnet *)control));
388	if (inp == NULL && req != PRU_ATTACH) {
389	error = EINVAL;
390	goto release;
391	}
392	/*
393	* Note: need to block udp_input while changing
394	* the udp pcb queue and/or pcb addresses.
395	*/
396	switch (req) {
397
398	case PRU_ATTACH:
399	if (inp != NULL) {
400	error = EINVAL;
401	break;
402	}
403	s = splnet();
404	error = in_pcballoc(so, &udb);
405	splx(s);
406	if (error)
407	break;
408	error = soreserve(so, udp_sendspace, udp_recvspace);
409	if (error)
410	break;
411	((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
412	break;
413
414	case PRU_DETACH:
415	udp_detach(inp);
416	break;
417
418	case PRU_BIND:
419	s = splnet();
420	error = in_pcbbind(inp, addr);
421	splx(s);
422	break;
423
424	case PRU_LISTEN:
425	error = EOPNOTSUPP;
426	break;
427
428	case PRU_CONNECT:
429	if (inp->inp_faddr.s_addr != INADDR_ANY) {
430	error = EISCONN;
431	break;
432	}
433	s = splnet();
434	error = in_pcbconnect(inp, addr);
435	splx(s);
436	if (error == 0)
437	soisconnected(so);
438	break;
439
440	case PRU_CONNECT2:
441	error = EOPNOTSUPP;
442	break;
443
444	case PRU_ACCEPT:
445	error = EOPNOTSUPP;
446	break;
447
448	case PRU_DISCONNECT:
449	if (inp->inp_faddr.s_addr == INADDR_ANY) {
450	error = ENOTCONN;
451	break;
452	}
453	s = splnet();
454	in_pcbdisconnect(inp);
455	inp->inp_laddr.s_addr = INADDR_ANY;
456	splx(s);
457	so->so_state &= ~SS_ISCONNECTED; /* XXX */
458	break;
459
460	case PRU_SHUTDOWN:
461	socantsendmore(so);
462	break;
463
464	case PRU_SEND:
465	return (udp_output(inp, m, addr, control));
466
467	case PRU_ABORT:
468	soisdisconnected(so);
469	udp_detach(inp);
470	break;
471
472	case PRU_SOCKADDR:
473	in_setsockaddr(inp, addr);
474	break;
475
476	case PRU_PEERADDR:
477	in_setpeeraddr(inp, addr);
478	break;
479
480	case PRU_SENSE:
481	/*
482	* stat: don't bother with a blocksize.
483	*/
484	return (0);
485
486	case PRU_SENDOOB:
487	case PRU_FASTTIMO:
488	case PRU_SLOWTIMO:
489	case PRU_PROTORCV:
490	case PRU_PROTOSEND:
491	error = EOPNOTSUPP;
492	break;
493
494	case PRU_RCVD:
495	case PRU_RCVOOB:
496	return (EOPNOTSUPP); /* do not free mbuf's */
497
498	default:
499	panic("udp_usrreq");
500	}
501
502	release:
503	if (control) {
504	printf("udp control data unexpectedly retained\n");
505	m_freem(control);
506	}
507	if (m)
508	m_freem(m);
509	return (error);
510	}
511
512	udp_detach(inp)
513	struct inpcb *inp;
514	{
515	int s = splnet();
516
517	if (inp == udp_last_inpcb)
518	udp_last_inpcb = &udb;
519	in_pcbdetach(inp);
520	splx(s);
521	}