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source: rtems/cpukit/libnetworking/netinet/udp_usrreq.c @ 751c513

4.104.114.84.95

Last change on this file since 751c513 was 751c513, checked in by Ralf Corsepius <ralf.corsepius@…>, on 12/03/04 at 05:07:56

2004-12-03 Ralf Corsepius <ralf.corsepius@…>

libnetworking/net/if_ethersubr.c, libnetworking/net/radix.h, libnetworking/netinet/if_ether.h, libnetworking/netinet/igmp_var.h, libnetworking/netinet/in_var.h, libnetworking/netinet/tcp_timer.h, libnetworking/netinet/udp_usrreq.c, libnetworking/rtems/rtems_glue.c: Misc. updates from FreeBSD and bugfixes tripped by GCC-4.0.0.

Property mode set to 100644

File size: 17.2 KB

Line
1	/*
2	* Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
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.
13	* 4. Neither the name of the University nor the names of its contributors
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 8.6 (Berkeley) 5/23/95
30	* $FreeBSD: src/sys/netinet/udp_usrreq.c,v 1.170 2004/11/08 14:44:53 phk Exp $
31	*/
32
33	#include <sys/param.h>
34	#include <sys/queue.h>
35	#include <sys/systm.h>
36	#include <sys/malloc.h>
37	#include <sys/mbuf.h>
38	#include <sys/protosw.h>
39	#include <sys/socket.h>
40	#include <sys/socketvar.h>
41	#include <sys/errno.h>
42	#include <sys/stat.h>
43	#include <sys/kernel.h>
44	#include <sys/sysctl.h>
45	#include <sys/syslog.h>
46
47	#include <net/if.h>
48	#include <net/route.h>
49
50	#include <netinet/in.h>
51	#include <netinet/in_systm.h>
52	#include <netinet/ip.h>
53	#include <netinet/in_pcb.h>
54	#include <netinet/in_var.h>
55	#include <netinet/ip_var.h>
56	#include <netinet/ip_icmp.h>
57	#include <netinet/udp.h>
58	#include <netinet/udp_var.h>
59
60	/*
61	* UDP protocol implementation.
62	* Per RFC 768, August, 1980.
63	*/
64	#ifndef COMPAT_42
65	static int udpcksum = 1;
66	#else
67	static int udpcksum = 0; /* XXX */
68	#endif
69	SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
70	&udpcksum, 0, "");
71
72	static int log_in_vain = 0;
73	SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
74	&log_in_vain, 0, "");
75
76	struct inpcbhead udb; /* from udp_var.h */
77	struct inpcbinfo udbinfo;
78
79	#ifndef UDBHASHSIZE
80	#define UDBHASHSIZE 64
81	#endif
82
83	struct udpstat udpstat; /* from udp_var.h */
84	SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD,
85	&udpstat, udpstat, "");
86
87	static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET };
88
89	static void udp_detach __P((struct inpcb *));
90	static int udp_output __P((struct inpcb , struct mbuf , struct mbuf *,
91	struct mbuf *));
92	static void udp_notify __P((struct inpcb *, int));
93
94	void
95	udp_init()
96	{
97	LIST_INIT(&udb);
98	udbinfo.listhead = &udb;
99	udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
100	}
101
102	void
103	udp_input(m, iphlen)
104	register struct mbuf *m;
105	int iphlen;
106	{
107	register struct ip *ip;
108	register struct udphdr *uh;
109	register struct inpcb *inp;
110	struct mbuf *opts = 0;
111	int len;
112	struct ip save_ip;
113
114	udpstat.udps_ipackets++;
115
116	/*
117	* Strip IP options, if any; should skip this,
118	* make available to user, and use on returned packets,
119	* but we don't yet have a way to check the checksum
120	* with options still present.
121	*/
122	if (iphlen > sizeof (struct ip)) {
123	ip_stripoptions(m, (struct mbuf *)0);
124	iphlen = sizeof(struct ip);
125	}
126
127	/*
128	* Get IP and UDP header together in first mbuf.
129	*/
130	ip = mtod(m, struct ip *);
131	if (m->m_len < iphlen + sizeof(struct udphdr)) {
132	if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
133	udpstat.udps_hdrops++;
134	return;
135	}
136	ip = mtod(m, struct ip *);
137	}
138	uh = (struct udphdr *)((caddr_t)ip + iphlen);
139
140	/*
141	* Make mbuf data length reflect UDP length.
142	* If not enough data to reflect UDP length, drop.
143	*/
144	len = ntohs((u_short)uh->uh_ulen);
145	if (ip->ip_len != len) {
146	if (len > ip->ip_len \|\| len < sizeof(struct udphdr)) {
147	udpstat.udps_badlen++;
148	goto bad;
149	}
150	m_adj(m, len - ip->ip_len);
151	/* ip->ip_len = len; */
152	}
153	/*
154	* Save a copy of the IP header in case we want restore it
155	* for sending an ICMP error message in response.
156	*/
157	save_ip = *ip;
158
159	/*
160	* Checksum extended UDP header and data.
161	*/
162	if (uh->uh_sum) {
163	((struct ipovly *)ip)->ih_next = 0;
164	((struct ipovly *)ip)->ih_prev = 0;
165	((struct ipovly *)ip)->ih_x1 = 0;
166	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
167	uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
168	if (uh->uh_sum) {
169	udpstat.udps_badsum++;
170	m_freem(m);
171	return;
172	}
173	}
174
175	if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) \|\|
176	in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
177	struct inpcb *last;
178	/*
179	* Deliver a multicast or broadcast datagram to all sockets
180	* for which the local and remote addresses and ports match
181	* those of the incoming datagram. This allows more than
182	* one process to receive multi/broadcasts on the same port.
183	* (This really ought to be done for unicast datagrams as
184	* well, but that would cause problems with existing
185	* applications that open both address-specific sockets and
186	* a wildcard socket listening to the same port -- they would
187	* end up receiving duplicates of every unicast datagram.
188	* Those applications open the multiple sockets to overcome an
189	* inadequacy of the UDP socket interface, but for backwards
190	* compatibility we avoid the problem here rather than
191	* fixing the interface. Maybe 4.5BSD will remedy this?)
192	*/
193
194	/*
195	* Construct sockaddr format source address.
196	*/
197	udp_in.sin_port = uh->uh_sport;
198	udp_in.sin_addr = ip->ip_src;
199	m->m_len -= sizeof (struct udpiphdr);
200	m->m_data += sizeof (struct udpiphdr);
201	/*
202	* Locate pcb(s) for datagram.
203	* (Algorithm copied from raw_intr().)
204	*/
205	last = NULL;
206	for (inp = udb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
207	if (inp->inp_lport != uh->uh_dport)
208	continue;
209	if (inp->inp_laddr.s_addr != INADDR_ANY) {
210	if (inp->inp_laddr.s_addr !=
211	ip->ip_dst.s_addr)
212	continue;
213	}
214	if (inp->inp_faddr.s_addr != INADDR_ANY) {
215	if (inp->inp_faddr.s_addr !=
216	ip->ip_src.s_addr \|\|
217	inp->inp_fport != uh->uh_sport)
218	continue;
219	}
220
221	if (last != NULL) {
222	struct mbuf *n;
223
224	if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
225	if (last->inp_flags & INP_CONTROLOPTS
226	\|\| last->inp_socket->so_options & SO_TIMESTAMP)
227	ip_savecontrol(last, &opts, ip, n);
228	if (sbappendaddr(&last->inp_socket->so_rcv,
229	(struct sockaddr *)&udp_in,
230	n, opts) == 0) {
231	m_freem(n);
232	if (opts)
233	m_freem(opts);
234	udpstat.udps_fullsock++;
235	} else
236	sorwakeup(last->inp_socket);
237	opts = 0;
238	}
239	}
240	last = inp;
241	/*
242	* Don't look for additional matches if this one does
243	* not have either the SO_REUSEPORT or SO_REUSEADDR
244	* socket options set. This heuristic avoids searching
245	* through all pcbs in the common case of a non-shared
246	* port. It * assumes that an application will never
247	* clear these options after setting them.
248	*/
249	if (((last->inp_socket->so_options&(SO_REUSEPORT\|SO_REUSEADDR)) == 0))
250	break;
251	}
252
253	if (last == NULL) {
254	/*
255	* No matching pcb found; discard datagram.
256	* (No need to send an ICMP Port Unreachable
257	* for a broadcast or multicast datgram.)
258	*/
259	udpstat.udps_noportbcast++;
260	goto bad;
261	}
262	if (last->inp_flags & INP_CONTROLOPTS
263	\|\| last->inp_socket->so_options & SO_TIMESTAMP)
264	ip_savecontrol(last, &opts, ip, m);
265	if (sbappendaddr(&last->inp_socket->so_rcv,
266	(struct sockaddr *)&udp_in,
267	m, opts) == 0) {
268	udpstat.udps_fullsock++;
269	goto bad;
270	}
271	sorwakeup(last->inp_socket);
272	return;
273	}
274	/*
275	* Locate pcb for datagram.
276	*/
277	inp = in_pcblookuphash(&udbinfo, ip->ip_src, uh->uh_sport,
278	ip->ip_dst, uh->uh_dport, 1);
279	if (inp == NULL) {
280	if (log_in_vain) {
281	char buf[4*sizeof "123"];
282
283	strcpy(buf, inet_ntoa(ip->ip_dst));
284	log(LOG_INFO, "Connection attempt to UDP %s:%d"
285	" from %s:%d\n",
286	buf, ntohs(uh->uh_dport),
287	inet_ntoa(ip->ip_src), ntohs(uh->uh_sport));
288	}
289	udpstat.udps_noport++;
290	if (m->m_flags & (M_BCAST \| M_MCAST)) {
291	udpstat.udps_noportbcast++;
292	goto bad;
293	}
294	*ip = save_ip;
295	icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
296	return;
297	}
298
299	/*
300	* Construct sockaddr format source address.
301	* Stuff source address and datagram in user buffer.
302	*/
303	udp_in.sin_port = uh->uh_sport;
304	udp_in.sin_addr = ip->ip_src;
305	if (inp->inp_flags & INP_CONTROLOPTS
306	\|\| inp->inp_socket->so_options & SO_TIMESTAMP)
307	ip_savecontrol(inp, &opts, ip, m);
308	iphlen += sizeof(struct udphdr);
309	m->m_len -= iphlen;
310	m->m_pkthdr.len -= iphlen;
311	m->m_data += iphlen;
312	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
313	m, opts) == 0) {
314	udpstat.udps_fullsock++;
315	goto bad;
316	}
317	sorwakeup(inp->inp_socket);
318	return;
319	bad:
320	m_freem(m);
321	if (opts)
322	m_freem(opts);
323	}
324
325	/*
326	* Notify a udp user of an asynchronous error;
327	* just wake up so that he can collect error status.
328	*/
329	static void
330	udp_notify(inp, errnum)
331	register struct inpcb *inp;
332	int errnum;
333	{
334	inp->inp_socket->so_error = errnum;
335	sorwakeup(inp->inp_socket);
336	sowwakeup(inp->inp_socket);
337	}
338
339	void
340	udp_ctlinput(cmd, sa, vip)
341	int cmd;
342	struct sockaddr *sa;
343	void *vip;
344	{
345	register struct ip *ip = vip;
346	register struct udphdr *uh;
347
348	if (!PRC_IS_REDIRECT(cmd) &&
349	((unsigned)cmd >= PRC_NCMDS \|\| inetctlerrmap[cmd] == 0))
350	return;
351	if (ip) {
352	uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
353	in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
354	cmd, udp_notify);
355	} else
356	in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
357	}
358
359	static int
360	udp_output(inp, m, addr, control)
361	register struct inpcb *inp;
362	register struct mbuf *m;
363	struct mbuf addr, control;
364	{
365	register struct udpiphdr *ui;
366	register int len = m->m_pkthdr.len;
367	struct in_addr laddr;
368	int s = 0, error = 0;
369
370	if (control)
371	m_freem(control); /* XXX */
372
373	if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
374	error = EMSGSIZE;
375	goto release;
376	}
377
378	if (addr) {
379	laddr = inp->inp_laddr;
380	if (inp->inp_faddr.s_addr != INADDR_ANY) {
381	error = EISCONN;
382	goto release;
383	}
384	/*
385	* Must block input while temporarily connected.
386	*/
387	s = splnet();
388	error = in_pcbconnect(inp, addr);
389	if (error) {
390	splx(s);
391	goto release;
392	}
393	} else {
394	if (inp->inp_faddr.s_addr == INADDR_ANY) {
395	error = ENOTCONN;
396	goto release;
397	}
398	}
399	/*
400	* Calculate data length and get a mbuf
401	* for UDP and IP headers.
402	*/
403	M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
404	if (m == 0) {
405	error = ENOBUFS;
406	if (addr)
407	splx(s);
408	goto release;
409	}
410
411	/*
412	* Fill in mbuf with extended UDP header
413	* and addresses and length put into network format.
414	*/
415	ui = mtod(m, struct udpiphdr *);
416	ui->ui_next = ui->ui_prev = 0;
417	ui->ui_x1 = 0;
418	ui->ui_pr = IPPROTO_UDP;
419	ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
420	ui->ui_src = inp->inp_laddr;
421	ui->ui_dst = inp->inp_faddr;
422	ui->ui_sport = inp->inp_lport;
423	ui->ui_dport = inp->inp_fport;
424	ui->ui_ulen = ui->ui_len;
425
426	/*
427	* Stuff checksum and output datagram.
428	*/
429	ui->ui_sum = 0;
430	if (udpcksum) {
431	if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
432	ui->ui_sum = 0xffff;
433	}
434	((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
435	((struct ip )ui)->ip_ttl = inp->inp_ip_ttl; / XXX */
436	((struct ip )ui)->ip_tos = inp->inp_ip_tos; / XXX */
437	udpstat.udps_opackets++;
438	error = ip_output(m, inp->inp_options, &inp->inp_route,
439	inp->inp_socket->so_options & (SO_DONTROUTE \| SO_BROADCAST),
440	inp->inp_moptions);
441
442	if (addr) {
443	in_pcbdisconnect(inp);
444	inp->inp_laddr = laddr;
445	splx(s);
446	}
447	return (error);
448
449	release:
450	m_freem(m);
451	return (error);
452	}
453
454	#ifdef __rtems__
455	#define INP_INFO_RLOCK(a)
456	#define INP_INFO_RUNLOCK(a)
457	#define INP_LOCK(a)
458	#define INP_UNLOCK(a)
459	#endif
460
461	static int
462	udp_pcblist(SYSCTL_HANDLER_ARGS)
463	{
464	int error, i, n, s;
465	struct inpcb inp, *inp_list;
466	inp_gen_t gencnt;
467	struct xinpgen xig;
468
469	/*
470	* The process of preparing the TCB list is too time-consuming and
471	* resource-intensive to repeat twice on every request.
472	*/
473	if (req->oldptr == 0) {
474	n = udbinfo.ipi_count;
475	req->oldidx = 2 * (sizeof xig)
476	+ (n + n/8) * sizeof(struct xinpcb);
477	return 0;
478	}
479
480	if (req->newptr != 0)
481	return EPERM;
482
483	/*
484	* OK, now we're committed to doing something.
485	*/
486	s = splnet();
487	gencnt = udbinfo.ipi_gencnt;
488	n = udbinfo.ipi_count;
489	splx(s);
490
491	sysctl_wire_old_buffer(req, 2 * (sizeof xig)
492	+ n * sizeof(struct xinpcb));
493
494	xig.xig_len = sizeof xig;
495	xig.xig_count = n;
496	xig.xig_gen = gencnt;
497	#if 0
498	xig.xig_sogen = so_gencnt;
499	#endif
500	error = SYSCTL_OUT(req, &xig, sizeof xig);
501	if (error)
502	return error;
503
504	/* ccj add the exit if count is 0 */
505	if (!n)
506	return error;
507
508	inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
509	if (inp_list == 0)
510	return ENOMEM;
511
512	s = splnet();
513	INP_INFO_RLOCK(&udbinfo);
514	for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n;
515	inp = LIST_NEXT(inp, inp_list)) {
516	INP_LOCK(inp);
517	if (inp->inp_gencnt <= gencnt)
518	#if 0
519	&&
520	cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
521	#endif
522	inp_list[i++] = inp;
523	INP_UNLOCK(inp);
524	}
525	INP_INFO_RUNLOCK(&udbinfo);
526	splx(s);
527	n = i;
528
529	error = 0;
530	for (i = 0; i < n; i++) {
531	inp = inp_list[i];
532	INP_LOCK(inp);
533	if (inp->inp_gencnt <= gencnt) {
534	struct xinpcb xi;
535	xi.xi_len = sizeof xi;
536	/* XXX should avoid extra copy */
537	bcopy(inp, &xi.xi_inp, sizeof *inp);
538	#if 0
539	if (inp->inp_socket)
540	sotoxsocket(inp->inp_socket, &xi.xi_socket);
541	#endif
542	error = SYSCTL_OUT(req, &xi, sizeof xi);
543	}
544	INP_UNLOCK(inp);
545	}
546	if (!error) {
547	/*
548	* Give the user an updated idea of our state.
549	* If the generation differs from what we told
550	* her before, she knows that something happened
551	* while we were processing this request, and it
552	* might be necessary to retry.
553	*/
554	s = splnet();
555	INP_INFO_RLOCK(&udbinfo);
556	xig.xig_gen = udbinfo.ipi_gencnt;
557	#if 0
558	xig.xig_sogen = so_gencnt;
559	#endif
560	xig.xig_count = udbinfo.ipi_count;
561	INP_INFO_RUNLOCK(&udbinfo);
562	splx(s);
563	error = SYSCTL_OUT(req, &xig, sizeof xig);
564	}
565	free(inp_list, M_TEMP);
566	return error;
567	}
568
569	SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
570	udp_pcblist, "S,xinpcb", "List of active UDP sockets");
571
572	static u_long udp_sendspace = 9216; /* really max datagram size */
573	/* 40 1K datagrams */
574	SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
575	&udp_sendspace, 0, "");
576
577	static u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
578	SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
579	&udp_recvspace, 0, "");
580
581	/ARGSUSED/
582	int
583	udp_usrreq(so, req, m, addr, control)
584	struct socket *so;
585	int req;
586	struct mbuf m, addr, *control;
587	{
588	struct inpcb *inp = sotoinpcb(so);
589	int error = 0;
590	int s;
591
592	if (req == PRU_CONTROL)
593	return (in_control(so, (u_long)m, (caddr_t)addr,
594	(struct ifnet *)control));
595	if (inp == NULL && req != PRU_ATTACH) {
596	error = EINVAL;
597	goto release;
598	}
599	/*
600	* Note: need to block udp_input while changing
601	* the udp pcb queue and/or pcb addresses.
602	*/
603	switch (req) {
604
605	case PRU_ATTACH:
606	if (inp != NULL) {
607	error = EINVAL;
608	break;
609	}
610	s = splnet();
611	error = in_pcballoc(so, &udbinfo);
612	splx(s);
613	if (error)
614	break;
615	error = soreserve(so, udp_sendspace, udp_recvspace);
616	if (error)
617	break;
618	((struct inpcb *) so->so_pcb)->inp_ip_ttl = ip_defttl;
619	break;
620
621	case PRU_DETACH:
622	udp_detach(inp);
623	break;
624
625	case PRU_BIND:
626	s = splnet();
627	error = in_pcbbind(inp, addr);
628	splx(s);
629	break;
630
631	case PRU_LISTEN:
632	error = EOPNOTSUPP;
633	break;
634
635	case PRU_CONNECT:
636	if (inp->inp_faddr.s_addr != INADDR_ANY) {
637	error = EISCONN;
638	break;
639	}
640	s = splnet();
641	error = in_pcbconnect(inp, addr);
642	splx(s);
643	if (error == 0)
644	soisconnected(so);
645	break;
646
647	case PRU_CONNECT2:
648	error = EOPNOTSUPP;
649	break;
650
651	case PRU_ACCEPT:
652	error = EOPNOTSUPP;
653	break;
654
655	case PRU_DISCONNECT:
656	if (inp->inp_faddr.s_addr == INADDR_ANY) {
657	error = ENOTCONN;
658	break;
659	}
660	s = splnet();
661	in_pcbdisconnect(inp);
662	inp->inp_laddr.s_addr = INADDR_ANY;
663	splx(s);
664	so->so_state &= ~SS_ISCONNECTED; /* XXX */
665	break;
666
667	case PRU_SHUTDOWN:
668	socantsendmore(so);
669	break;
670
671	case PRU_SEND:
672	return (udp_output(inp, m, addr, control));
673
674	case PRU_ABORT:
675	soisdisconnected(so);
676	udp_detach(inp);
677	break;
678
679	case PRU_SOCKADDR:
680	in_setsockaddr(inp, addr);
681	break;
682
683	case PRU_PEERADDR:
684	in_setpeeraddr(inp, addr);
685	break;
686
687	case PRU_SENSE:
688	/*
689	* stat: don't bother with a blocksize.
690	*/
691	return (0);
692
693	case PRU_SENDOOB:
694	case PRU_FASTTIMO:
695	case PRU_SLOWTIMO:
696	case PRU_PROTORCV:
697	case PRU_PROTOSEND:
698	error = EOPNOTSUPP;
699	break;
700
701	case PRU_RCVD:
702	case PRU_RCVOOB:
703	return (EOPNOTSUPP); /* do not free mbuf's */
704
705	default:
706	panic("udp_usrreq");
707	}
708
709	release:
710	if (control) {
711	printf("udp control data unexpectedly retained\n");
712	m_freem(control);
713	}
714	if (m)
715	m_freem(m);
716	return (error);
717	}
718
719	static void
720	udp_detach(inp)
721	struct inpcb *inp;
722	{
723	int s = splnet();
724
725	in_pcbdetach(inp);
726	splx(s);
727	}

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