[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 1.5 1993/11/25 01:35:22 wollman Exp $
 */

#include "param.h"
#include "systm.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 "in_var.h"
#include "ip.h"
#include "in_pcb.h"
#include "ip_var.h"
#include "ip_icmp.h"
#include "udp.h"
#include "udp_var.h"

static struct	inpcb udb;
static struct	inpcb *udp_last_inpcb = &udb;

static void udp_detach(struct inpcb *);

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

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

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

void
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.
 */
void
udp_notify(inp, errno)
	register struct inpcb *inp;
	int errno;
{

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

void
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);
}

int
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 = 0, 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);
}

/*ARGSUSED*/
int
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);
}

static void
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
fde1aeb2	34	* $Id: udp_usrreq.c,v 1.5 1993/11/25 01:35:22 wollman Exp $
15637ed4 RG	35	*/
	36
	37	#include "param.h"
fde1aeb2	38	#include "systm.h"
15637ed4 RG	39	#include "malloc.h"
	40	#include "mbuf.h"
	41	#include "protosw.h"
	42	#include "socket.h"
	43	#include "socketvar.h"
	44	#include "stat.h"
	45
	46	#include "../net/if.h"
	47	#include "../net/route.h"
	48
	49	#include "in.h"
	50	#include "in_systm.h"
fde1aeb2	51	#include "in_var.h"
15637ed4 RG	52	#include "ip.h"
	53	#include "in_pcb.h"
	54	#include "ip_var.h"
	55	#include "ip_icmp.h"
	56	#include "udp.h"
	57	#include "udp_var.h"
	58
fde1aeb2 GW	59	static struct inpcb udb;
fde1aeb2 GW	60	static struct inpcb *udp_last_inpcb = &udb;
15637ed4	61
4c45483e GW	62	static void udp_detach(struct inpcb *);
4c45483e GW	63
15637ed4 RG	64	/*
	65	* UDP protocol implementation.
	66	* Per RFC 768, August, 1980.
	67	*/
4c45483e	68	void
15637ed4 RG	69	udp_init()
	70	{
	71
	72	udb.inp_next = udb.inp_prev = &udb;
	73	}
	74
fde1aeb2	75	static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
15637ed4	76
4c45483e	77	void
15637ed4 RG	78	udp_input(m, iphlen)
	79	register struct mbuf *m;
	80	int iphlen;
	81	{
	82	register struct ip *ip;
	83	register struct udphdr *uh;
	84	register struct inpcb *inp;
	85	struct mbuf *opts = 0;
	86	int len;
	87	struct ip save_ip;
	88
	89	udpstat.udps_ipackets++;
	90
	91	/*
	92	* Strip IP options, if any; should skip this,
	93	* make available to user, and use on returned packets,
	94	* but we don't yet have a way to check the checksum
	95	* with options still present.
	96	*/
	97	if (iphlen > sizeof (struct ip)) {
	98	ip_stripoptions(m, (struct mbuf *)0);
	99	iphlen = sizeof(struct ip);
	100	}
	101
	102	/*
	103	* Get IP and UDP header together in first mbuf.
	104	*/
	105	ip = mtod(m, struct ip *);
	106	if (m->m_len < iphlen + sizeof(struct udphdr)) {
	107	if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
	108	udpstat.udps_hdrops++;
	109	return;
	110	}
	111	ip = mtod(m, struct ip *);
	112	}
	113	uh = (struct udphdr *)((caddr_t)ip + iphlen);
	114
	115	/*
	116	* Make mbuf data length reflect UDP length.
	117	* If not enough data to reflect UDP length, drop.
	118	*/
	119	len = ntohs((u_short)uh->uh_ulen);
	120	if (ip->ip_len != len) {
	121	if (len > ip->ip_len) {
	122	udpstat.udps_badlen++;
	123	goto bad;
	124	}
	125	m_adj(m, len - ip->ip_len);
	126	/* ip->ip_len = len; */
	127	}
	128	/*
	129	* Save a copy of the IP header in case we want restore it
	130	* for sending an ICMP error message in response.
	131	*/
	132	save_ip = *ip;
	133
	134	/*
	135	* Checksum extended UDP header and data.
	136	*/
	137	if (udpcksum && uh->uh_sum) {
	138	((struct ipovly *)ip)->ih_next = 0;
	139	((struct ipovly *)ip)->ih_prev = 0;
	140	((struct ipovly *)ip)->ih_x1 = 0;
	141	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
142	if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
143	udpstat.udps_badsum++;
144	m_freem(m);
145	return;
146	}
147	}
148
149	/*
150	* Locate pcb for datagram.
151	*/
152	inp = udp_last_inpcb;
153	if (inp->inp_lport != uh->uh_dport \|\|
154	inp->inp_fport != uh->uh_sport \|\|
155	inp->inp_faddr.s_addr != ip->ip_src.s_addr \|\|
156	inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
157	inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
158	ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
159	if (inp)
160	udp_last_inpcb = inp;
161	udpstat.udpps_pcbcachemiss++;
162	}
163	if (inp == 0) {
164	/* don't send ICMP response for broadcast packet */
165	udpstat.udps_noport++;
166	if (m->m_flags & M_BCAST) {
167	udpstat.udps_noportbcast++;
168	goto bad;
169	}
170	*ip = save_ip;
171	ip->ip_len += iphlen;
2cb63509 GW	172	{
	173	static struct in_addr fake;
	174	icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, fake, 0);
	175	}
15637ed4 RG	176	return;
	177	}
	178
	179	/*
	180	* Construct sockaddr format source address.
	181	* Stuff source address and datagram in user buffer.
	182	*/
	183	udp_in.sin_port = uh->uh_sport;
	184	udp_in.sin_addr = ip->ip_src;
	185	if (inp->inp_flags & INP_CONTROLOPTS) {
	186	struct mbuf **mp = &opts;
	187	struct mbuf *udp_saveopt();
	188
	189	if (inp->inp_flags & INP_RECVDSTADDR) {
	190	*mp = udp_saveopt((caddr_t) &ip->ip_dst,
	191	sizeof(struct in_addr), IP_RECVDSTADDR);
	192	if (*mp)
	193	mp = &(*mp)->m_next;
	194	}
	195	#ifdef notyet
	196	/* options were tossed above */
	197	if (inp->inp_flags & INP_RECVOPTS) {
	198	*mp = udp_saveopt((caddr_t) opts_deleted_above,
	199	sizeof(struct in_addr), IP_RECVOPTS);
	200	if (*mp)
	201	mp = &(*mp)->m_next;
	202	}
	203	/* ip_srcroute doesn't do what we want here, need to fix */
	204	if (inp->inp_flags & INP_RECVRETOPTS) {
	205	*mp = udp_saveopt((caddr_t) ip_srcroute(),
	206	sizeof(struct in_addr), IP_RECVRETOPTS);
	207	if (*mp)
	208	mp = &(*mp)->m_next;
	209	}
	210	#endif
	211	}
	212	iphlen += sizeof(struct udphdr);
	213	m->m_len -= iphlen;
	214	m->m_pkthdr.len -= iphlen;
	215	m->m_data += iphlen;
	216	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
	217	m, opts) == 0) {
	218	udpstat.udps_fullsock++;
	219	goto bad;
	220	}
	221	sorwakeup(inp->inp_socket);
	222	return;
	223	bad:
	224	m_freem(m);
	225	if (opts)
	226	m_freem(opts);
	227	}
	228
	229	/*
	230	* Create a "control" mbuf containing the specified data
	231	* with the specified type for presentation with a datagram.
	232	*/
	233	struct mbuf *
	234	udp_saveopt(p, size, type)
	235	caddr_t p;
	236	register int size;
	237	int type;
	238	{
	239	register struct cmsghdr *cp;
240	struct mbuf *m;
241
242	if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
243	return ((struct mbuf *) NULL);
244	cp = (struct cmsghdr ) mtod(m, struct cmsghdr );
245	bcopy(p, (caddr_t)(cp + 1), size);
246	size += sizeof(*cp);
247	m->m_len = size;
248	cp->cmsg_len = size;
249	cp->cmsg_level = IPPROTO_IP;
250	cp->cmsg_type = type;
251	return (m);
252	}
253
254	/*
255	* Notify a udp user of an asynchronous error;
256	* just wake up so that he can collect error status.
257	*/
4c45483e	258	void
15637ed4 RG	259	udp_notify(inp, errno)
15637ed4 RG	260	register struct inpcb *inp;
4c45483e	261	int errno;
15637ed4 RG	262	{
	263
	264	inp->inp_socket->so_error = errno;
	265	sorwakeup(inp->inp_socket);
	266	sowwakeup(inp->inp_socket);
	267	}
	268
4c45483e	269	void
15637ed4 RG	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
4c45483e	289	int
15637ed4 RG	290	udp_output(inp, m, addr, control)
	291	register struct inpcb *inp;
	292	register struct mbuf *m;
	293	struct mbuf addr, control;
	294	{
	295	register struct udpiphdr *ui;
	296	register int len = m->m_pkthdr.len;
	297	struct in_addr laddr;
4c45483e	298	int s = 0, error = 0;
15637ed4 RG	299
	300	if (control)
	301	m_freem(control); /* XXX */
	302
	303	if (addr) {
	304	laddr = inp->inp_laddr;
	305	if (inp->inp_faddr.s_addr != INADDR_ANY) {
	306	error = EISCONN;
	307	goto release;
	308	}
	309	/*
	310	* Must block input while temporarily connected.
	311	*/
	312	s = splnet();
	313	error = in_pcbconnect(inp, addr);
	314	if (error) {
	315	splx(s);
	316	goto release;
	317	}
	318	} else {
	319	if (inp->inp_faddr.s_addr == INADDR_ANY) {
	320	error = ENOTCONN;
	321	goto release;
	322	}
	323	}
	324	/*
	325	* Calculate data length and get a mbuf
	326	* for UDP and IP headers.
	327	*/
	328	M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);
	329
	330	/*
	331	* Fill in mbuf with extended UDP header
	332	* and addresses and length put into network format.
	333	*/
	334	ui = mtod(m, struct udpiphdr *);
	335	ui->ui_next = ui->ui_prev = 0;
	336	ui->ui_x1 = 0;
	337	ui->ui_pr = IPPROTO_UDP;
	338	ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
	339	ui->ui_src = inp->inp_laddr;
	340	ui->ui_dst = inp->inp_faddr;
	341	ui->ui_sport = inp->inp_lport;
	342	ui->ui_dport = inp->inp_fport;
	343	ui->ui_ulen = ui->ui_len;
	344
	345	/*
	346	* Stuff checksum and output datagram.
	347	*/
	348	ui->ui_sum = 0;
	349	if (udpcksum) {
	350	if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
	351	ui->ui_sum = 0xffff;
	352	}
	353	((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
	354	((struct ip )ui)->ip_ttl = inp->inp_ip.ip_ttl; / XXX */
	355	((struct ip )ui)->ip_tos = inp->inp_ip.ip_tos; / XXX */
	356	udpstat.udps_opackets++;
	357	error = ip_output(m, inp->inp_options, &inp->inp_route,
	358	inp->inp_socket->so_options & (SO_DONTROUTE \| SO_BROADCAST));
	359
	360	if (addr) {
	361	in_pcbdisconnect(inp);
	362	inp->inp_laddr = laddr;
363	splx(s);
364	}
365	return (error);
366
367	release:
368	m_freem(m);
369	return (error);
370	}
371
15637ed4	372	/ARGSUSED/
4c45483e	373	int
15637ed4 RG	374	udp_usrreq(so, req, m, addr, control)
	375	struct socket *so;
	376	int req;
	377	struct mbuf m, addr, *control;
	378	{
	379	struct inpcb *inp = sotoinpcb(so);
	380	int error = 0;
	381	int s;
	382
	383	if (req == PRU_CONTROL)
	384	return (in_control(so, (int)m, (caddr_t)addr,
	385	(struct ifnet *)control));
	386	if (inp == NULL && req != PRU_ATTACH) {
	387	error = EINVAL;
	388	goto release;
	389	}
	390	/*
	391	* Note: need to block udp_input while changing
	392	* the udp pcb queue and/or pcb addresses.
	393	*/
	394	switch (req) {
	395
	396	case PRU_ATTACH:
	397	if (inp != NULL) {
	398	error = EINVAL;
	399	break;
	400	}
	401	s = splnet();
	402	error = in_pcballoc(so, &udb);
	403	splx(s);
	404	if (error)
	405	break;
	406	error = soreserve(so, udp_sendspace, udp_recvspace);
	407	if (error)
	408	break;
	409	((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
	410	break;
	411
	412	case PRU_DETACH:
	413	udp_detach(inp);
	414	break;
	415
	416	case PRU_BIND:
	417	s = splnet();
	418	error = in_pcbbind(inp, addr);
	419	splx(s);
	420	break;
	421
	422	case PRU_LISTEN:
	423	error = EOPNOTSUPP;
	424	break;
	425
	426	case PRU_CONNECT:
	427	if (inp->inp_faddr.s_addr != INADDR_ANY) {
	428	error = EISCONN;
	429	break;
	430	}
	431	s = splnet();
	432	error = in_pcbconnect(inp, addr);
	433	splx(s);
	434	if (error == 0)
	435	soisconnected(so);
	436	break;
	437
438	case PRU_CONNECT2:
439	error = EOPNOTSUPP;
440	break;
441
442	case PRU_ACCEPT:
443	error = EOPNOTSUPP;
444	break;
445
446	case PRU_DISCONNECT:
447	if (inp->inp_faddr.s_addr == INADDR_ANY) {
448	error = ENOTCONN;
449	break;
450	}
451	s = splnet();
452	in_pcbdisconnect(inp);
453	inp->inp_laddr.s_addr = INADDR_ANY;
454	splx(s);
455	so->so_state &= ~SS_ISCONNECTED; /* XXX */
456	break;
457
458	case PRU_SHUTDOWN:
459	socantsendmore(so);
460	break;
461
462	case PRU_SEND:
463	return (udp_output(inp, m, addr, control));
464
465	case PRU_ABORT:
466	soisdisconnected(so);
467	udp_detach(inp);
468	break;
469
470	case PRU_SOCKADDR:
471	in_setsockaddr(inp, addr);
472	break;
473
474	case PRU_PEERADDR:
475	in_setpeeraddr(inp, addr);
476	break;
477
478	case PRU_SENSE:
479	/*
480	* stat: don't bother with a blocksize.
481	*/
482	return (0);
483
484	case PRU_SENDOOB:
485	case PRU_FASTTIMO:
486	case PRU_SLOWTIMO:
487	case PRU_PROTORCV:
488	case PRU_PROTOSEND:
489	error = EOPNOTSUPP;
490	break;
491
492	case PRU_RCVD:
493	case PRU_RCVOOB:
494	return (EOPNOTSUPP); /* do not free mbuf's */
495
496	default:
497	panic("udp_usrreq");
498	}
499
500	release:
501	if (control) {
502	printf("udp control data unexpectedly retained\n");
503	m_freem(control);
504	}
505	if (m)
506	m_freem(m);
507	return (error);
508	}
509
4c45483e	510	static void
15637ed4 RG	511	udp_detach(inp)
	512	struct inpcb *inp;
	513	{
	514	int s = splnet();
	515
	516	if (inp == udp_last_inpcb)
	517	udp_last_inpcb = &udb;
	518	in_pcbdetach(inp);
	519	splx(s);
	520	}