[unix-history] / usr / src / sys.386bsd / 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.
 *
 *	@(#)udp_usrreq.c	7.20 (Berkeley) 4/20/91
 */

#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 *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;
		icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT);
		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
b688fc87 WJ	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	*
	33	* @(#)udp_usrreq.c 7.20 (Berkeley) 4/20/91
	34	*/
	35
	36	#include "param.h"
	37	#include "malloc.h"
	38	#include "mbuf.h"
	39	#include "protosw.h"
	40	#include "socket.h"
	41	#include "socketvar.h"
	42	#include "stat.h"
	43
	44	#include "../net/if.h"
	45	#include "../net/route.h"
	46
	47	#include "in.h"
	48	#include "in_systm.h"
	49	#include "ip.h"
	50	#include "in_pcb.h"
	51	#include "ip_var.h"
	52	#include "ip_icmp.h"
	53	#include "udp.h"
	54	#include "udp_var.h"
	55
	56	struct inpcb *udp_last_inpcb = &udb;
	57
	58	/*
	59	* UDP protocol implementation.
	60	* Per RFC 768, August, 1980.
	61	*/
	62	udp_init()
	63	{
	64
65	udb.inp_next = udb.inp_prev = &udb;
66	}
67
68	#ifndef COMPAT_42
69	int udpcksum = 1;
70	#else
71	int udpcksum = 0; /* XXX */
72	#endif
73	int udp_ttl = UDP_TTL;
74
75	struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
76
77	udp_input(m, iphlen)
78	register struct mbuf *m;
79	int iphlen;
80	{
81	register struct ip *ip;
82	register struct udphdr *uh;
83	register struct inpcb *inp;
84	struct mbuf *opts = 0;
85	int len;
86	struct ip save_ip;
87
88	udpstat.udps_ipackets++;
89
90	/*
91	* Strip IP options, if any; should skip this,
92	* make available to user, and use on returned packets,
93	* but we don't yet have a way to check the checksum
94	* with options still present.
95	*/
96	if (iphlen > sizeof (struct ip)) {
97	ip_stripoptions(m, (struct mbuf *)0);
98	iphlen = sizeof(struct ip);
99	}
100
101	/*
102	* Get IP and UDP header together in first mbuf.
103	*/
104	ip = mtod(m, struct ip *);
105	if (m->m_len < iphlen + sizeof(struct udphdr)) {
106	if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
107	udpstat.udps_hdrops++;
108	return;
109	}
110	ip = mtod(m, struct ip *);
111	}
112	uh = (struct udphdr *)((caddr_t)ip + iphlen);
113
114	/*
115	* Make mbuf data length reflect UDP length.
116	* If not enough data to reflect UDP length, drop.
117	*/
118	len = ntohs((u_short)uh->uh_ulen);
119	if (ip->ip_len != len) {
120	if (len > ip->ip_len) {
121	udpstat.udps_badlen++;
122	goto bad;
123	}
124	m_adj(m, len - ip->ip_len);
125	/* ip->ip_len = len; */
126	}
127	/*
128	* Save a copy of the IP header in case we want restore it
129	* for sending an ICMP error message in response.
130	*/
131	save_ip = *ip;
132
133	/*
134	* Checksum extended UDP header and data.
135	*/
136	if (udpcksum && uh->uh_sum) {
137	((struct ipovly *)ip)->ih_next = 0;
138	((struct ipovly *)ip)->ih_prev = 0;
139	((struct ipovly *)ip)->ih_x1 = 0;
140	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
141	if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) {
142	udpstat.udps_badsum++;
143	m_freem(m);
144	return;
145	}
146	}
147
148	/*
149	* Locate pcb for datagram.
150	*/
151	inp = udp_last_inpcb;
152	if (inp->inp_lport != uh->uh_dport \|\|
153	inp->inp_fport != uh->uh_sport \|\|
154	inp->inp_faddr.s_addr != ip->ip_src.s_addr \|\|
155	inp->inp_laddr.s_addr != ip->ip_dst.s_addr) {
156	inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport,
157	ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD);
158	if (inp)
159	udp_last_inpcb = inp;
160	udpstat.udpps_pcbcachemiss++;
161	}
162	if (inp == 0) {
163	/* don't send ICMP response for broadcast packet */
164	udpstat.udps_noport++;
165	if (m->m_flags & M_BCAST) {
166	udpstat.udps_noportbcast++;
167	goto bad;
168	}
169	*ip = save_ip;
170	ip->ip_len += iphlen;
171	icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT);
172	return;
173	}
174
175	/*
176	* Construct sockaddr format source address.
177	* Stuff source address and datagram in user buffer.
178	*/
179	udp_in.sin_port = uh->uh_sport;
180	udp_in.sin_addr = ip->ip_src;
181	if (inp->inp_flags & INP_CONTROLOPTS) {
182	struct mbuf **mp = &opts;
183	struct mbuf *udp_saveopt();
184
185	if (inp->inp_flags & INP_RECVDSTADDR) {
186	*mp = udp_saveopt((caddr_t) &ip->ip_dst,
187	sizeof(struct in_addr), IP_RECVDSTADDR);
188	if (*mp)
189	mp = &(*mp)->m_next;
190	}
191	#ifdef notyet
192	/* options were tossed above */
193	if (inp->inp_flags & INP_RECVOPTS) {
194	*mp = udp_saveopt((caddr_t) opts_deleted_above,
195	sizeof(struct in_addr), IP_RECVOPTS);
196	if (*mp)
197	mp = &(*mp)->m_next;
198	}
199	/* ip_srcroute doesn't do what we want here, need to fix */
200	if (inp->inp_flags & INP_RECVRETOPTS) {
201	*mp = udp_saveopt((caddr_t) ip_srcroute(),
202	sizeof(struct in_addr), IP_RECVRETOPTS);
203	if (*mp)
204	mp = &(*mp)->m_next;
205	}
206	#endif
207	}
208	iphlen += sizeof(struct udphdr);
209	m->m_len -= iphlen;
210	m->m_pkthdr.len -= iphlen;
211	m->m_data += iphlen;
212	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
213	m, opts) == 0) {
214	udpstat.udps_fullsock++;
215	goto bad;
216	}
217	sorwakeup(inp->inp_socket);
218	return;
219	bad:
220	m_freem(m);
221	if (opts)
222	m_freem(opts);
223	}
224
225	/*
226	* Create a "control" mbuf containing the specified data
227	* with the specified type for presentation with a datagram.
228	*/
229	struct mbuf *
230	udp_saveopt(p, size, type)
231	caddr_t p;
232	register int size;
233	int type;
234	{
235	register struct cmsghdr *cp;
236	struct mbuf *m;
237
238	if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
239	return ((struct mbuf *) NULL);
240	cp = (struct cmsghdr ) mtod(m, struct cmsghdr );
241	bcopy(p, (caddr_t)(cp + 1), size);
242	size += sizeof(*cp);
243	m->m_len = size;
244	cp->cmsg_len = size;
245	cp->cmsg_level = IPPROTO_IP;
246	cp->cmsg_type = type;
247	return (m);
248	}
249
250	/*
251	* Notify a udp user of an asynchronous error;
252	* just wake up so that he can collect error status.
253	*/
254	udp_notify(inp, errno)
255	register struct inpcb *inp;
256	{
257
258	inp->inp_socket->so_error = errno;
259	sorwakeup(inp->inp_socket);
260	sowwakeup(inp->inp_socket);
261	}
262
263	udp_ctlinput(cmd, sa, ip)
264	int cmd;
265	struct sockaddr *sa;
266	register struct ip *ip;
267	{
268	register struct udphdr *uh;
269	extern struct in_addr zeroin_addr;
270	extern u_char inetctlerrmap[];
271
272	if ((unsigned)cmd > PRC_NCMDS \|\| inetctlerrmap[cmd] == 0)
273	return;
274	if (ip) {
275	uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
276	in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
277	cmd, udp_notify);
278	} else
279	in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
280	}
281
282	udp_output(inp, m, addr, control)
283	register struct inpcb *inp;
284	register struct mbuf *m;
285	struct mbuf addr, control;
286	{
287	register struct udpiphdr *ui;
288	register int len = m->m_pkthdr.len;
289	struct in_addr laddr;
290	int s, error = 0;
291
292	if (control)
293	m_freem(control); /* XXX */
294
295	if (addr) {
296	laddr = inp->inp_laddr;
297	if (inp->inp_faddr.s_addr != INADDR_ANY) {
298	error = EISCONN;
299	goto release;
300	}
301	/*
302	* Must block input while temporarily connected.
303	*/
304	s = splnet();
305	error = in_pcbconnect(inp, addr);
306	if (error) {
307	splx(s);
308	goto release;
309	}
310	} else {
311	if (inp->inp_faddr.s_addr == INADDR_ANY) {
312	error = ENOTCONN;
313	goto release;
314	}
315	}
316	/*
317	* Calculate data length and get a mbuf
318	* for UDP and IP headers.
319	*/
320	M_PREPEND(m, sizeof(struct udpiphdr), M_WAIT);
321
322	/*
323	* Fill in mbuf with extended UDP header
324	* and addresses and length put into network format.
325	*/
326	ui = mtod(m, struct udpiphdr *);
327	ui->ui_next = ui->ui_prev = 0;
328	ui->ui_x1 = 0;
329	ui->ui_pr = IPPROTO_UDP;
330	ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
331	ui->ui_src = inp->inp_laddr;
332	ui->ui_dst = inp->inp_faddr;
333	ui->ui_sport = inp->inp_lport;
334	ui->ui_dport = inp->inp_fport;
335	ui->ui_ulen = ui->ui_len;
336
337	/*
338	* Stuff checksum and output datagram.
339	*/
340	ui->ui_sum = 0;
341	if (udpcksum) {
342	if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
343	ui->ui_sum = 0xffff;
344	}
345	((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
346	((struct ip )ui)->ip_ttl = inp->inp_ip.ip_ttl; / XXX */
347	((struct ip )ui)->ip_tos = inp->inp_ip.ip_tos; / XXX */
348	udpstat.udps_opackets++;
349	error = ip_output(m, inp->inp_options, &inp->inp_route,
350	inp->inp_socket->so_options & (SO_DONTROUTE \| SO_BROADCAST));
351
352	if (addr) {
353	in_pcbdisconnect(inp);
354	inp->inp_laddr = laddr;
355	splx(s);
356	}
357	return (error);
358
359	release:
360	m_freem(m);
361	return (error);
362	}
363
364	u_long udp_sendspace = 9216; /* really max datagram size */
365	u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
366	/* 40 1K datagrams */
367
368	/ARGSUSED/
369	udp_usrreq(so, req, m, addr, control)
370	struct socket *so;
371	int req;
372	struct mbuf m, addr, *control;
373	{
374	struct inpcb *inp = sotoinpcb(so);
375	int error = 0;
376	int s;
377
378	if (req == PRU_CONTROL)
379	return (in_control(so, (int)m, (caddr_t)addr,
380	(struct ifnet *)control));
381	if (inp == NULL && req != PRU_ATTACH) {
382	error = EINVAL;
383	goto release;
384	}
385	/*
386	* Note: need to block udp_input while changing
387	* the udp pcb queue and/or pcb addresses.
388	*/
389	switch (req) {
390
391	case PRU_ATTACH:
392	if (inp != NULL) {
393	error = EINVAL;
394	break;
395	}
396	s = splnet();
397	error = in_pcballoc(so, &udb);
398	splx(s);
399	if (error)
400	break;
401	error = soreserve(so, udp_sendspace, udp_recvspace);
402	if (error)
403	break;
404	((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = udp_ttl;
405	break;
406
407	case PRU_DETACH:
408	udp_detach(inp);
409	break;
410
411	case PRU_BIND:
412	s = splnet();
413	error = in_pcbbind(inp, addr);
414	splx(s);
415	break;
416
417	case PRU_LISTEN:
418	error = EOPNOTSUPP;
419	break;
420
421	case PRU_CONNECT:
422	if (inp->inp_faddr.s_addr != INADDR_ANY) {
423	error = EISCONN;
424	break;
425	}
426	s = splnet();
427	error = in_pcbconnect(inp, addr);
428	splx(s);
429	if (error == 0)
430	soisconnected(so);
431	break;
432
433	case PRU_CONNECT2:
434	error = EOPNOTSUPP;
435	break;
436
437	case PRU_ACCEPT:
438	error = EOPNOTSUPP;
439	break;
440
441	case PRU_DISCONNECT:
442	if (inp->inp_faddr.s_addr == INADDR_ANY) {
443	error = ENOTCONN;
444	break;
445	}
446	s = splnet();
447	in_pcbdisconnect(inp);
448	inp->inp_laddr.s_addr = INADDR_ANY;
449	splx(s);
450	so->so_state &= ~SS_ISCONNECTED; /* XXX */
451	break;
452
453	case PRU_SHUTDOWN:
454	socantsendmore(so);
455	break;
456
457	case PRU_SEND:
458	return (udp_output(inp, m, addr, control));
459
460	case PRU_ABORT:
461	soisdisconnected(so);
462	udp_detach(inp);
463	break;
464
465	case PRU_SOCKADDR:
466	in_setsockaddr(inp, addr);
467	break;
468
469	case PRU_PEERADDR:
470	in_setpeeraddr(inp, addr);
471	break;
472
473	case PRU_SENSE:
474	/*
475	* stat: don't bother with a blocksize.
476	*/
477	return (0);
478
479	case PRU_SENDOOB:
480	case PRU_FASTTIMO:
481	case PRU_SLOWTIMO:
482	case PRU_PROTORCV:
483	case PRU_PROTOSEND:
484	error = EOPNOTSUPP;
485	break;
486
487	case PRU_RCVD:
488	case PRU_RCVOOB:
489	return (EOPNOTSUPP); /* do not free mbuf's */
490
491	default:
492	panic("udp_usrreq");
493	}
494
495	release:
496	if (control) {
497	printf("udp control data unexpectedly retained\n");
498	m_freem(control);
499	}
500	if (m)
501	m_freem(m);
502	return (error);
503	}
504
505	udp_detach(inp)
506	struct inpcb *inp;
507	{
508	int s = splnet();
509
510	if (inp == udp_last_inpcb)
511	udp_last_inpcb = &udb;
512	in_pcbdetach(inp);
513	splx(s);
514	}