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udp_usrreq.c @ 45f9cd0

4.10

Last change on this file since 45f9cd0 was 45f9cd0, checked in by Sebastian Huber <sebastian.huber@…>, on 11/02/12 at 13:45:50

libnetworking: Disconnect after mbuf shortage

The missing disconnect left the socket in an unusable state. Each send
request resulted in an EISCONN error.

Property mode set to 100644

File size: 17.5 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	#ifdef HAVE_CONFIG_H
34	#include "config.h"
35	#endif
36
37	#include <sys/param.h>
38	#include <rtems/bsd/sys/queue.h>
39	#include <sys/systm.h>
40	#include <sys/malloc.h>
41	#include <sys/mbuf.h>
42	#include <sys/protosw.h>
43	#include <sys/socket.h>
44	#include <sys/socketvar.h>
45	#include <errno.h>
46	#include <sys/stat.h>
47	#include <sys/kernel.h>
48	#include <sys/sysctl.h>
49	#include <sys/syslog.h>
50
51	#include <net/if.h>
52	#include <net/route.h>
53
54	#include <netinet/in.h>
55	#include <netinet/in_systm.h>
56	#include <netinet/ip.h>
57	#include <netinet/in_pcb.h>
58	#include <netinet/in_var.h>
59	#include <netinet/ip_var.h>
60	#include <netinet/ip_icmp.h>
61	#include <netinet/udp.h>
62	#include <netinet/udp_var.h>
63
64	/*
65	* UDP protocol implementation.
66	* Per RFC 768, August, 1980.
67	*/
68	#ifndef COMPAT_42
69	static int udpcksum = 1;
70	#else
71	static int udpcksum = 0; /* XXX */
72	#endif
73	SYSCTL_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW,
74	&udpcksum, 0, "");
75
76	static int log_in_vain = 0;
77	SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW,
78	&log_in_vain, 0, "");
79
80	struct inpcbhead udb; /* from udp_var.h */
81	struct inpcbinfo udbinfo;
82
83	#ifndef UDBHASHSIZE
84	#define UDBHASHSIZE 64
85	#endif
86
87	struct udpstat udpstat; /* from udp_var.h */
88	SYSCTL_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RD,
89	&udpstat, udpstat, "");
90
91	static struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET, 0, {0}, {0} };
92
93	static void udp_detach(struct inpcb *);
94	static int udp_output(struct inpcb , struct mbuf , struct mbuf *,
95	struct mbuf *);
96	static void udp_notify(struct inpcb *, int);
97
98	void
99	udp_init(void)
100	{
101	LIST_INIT(&udb);
102	udbinfo.listhead = &udb;
103	udbinfo.hashbase = hashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashmask);
104	}
105
106	void
107	udp_input(struct mbuf *m, int iphlen)
108	{
109	register struct ip *ip;
110	register struct udphdr *uh;
111	register struct inpcb *inp;
112	struct mbuf *opts = 0;
113	int len;
114	struct ip save_ip;
115
116	udpstat.udps_ipackets++;
117
118	/*
119	* Strip IP options, if any; should skip this,
120	* make available to user, and use on returned packets,
121	* but we don't yet have a way to check the checksum
122	* with options still present.
123	*/
124	if (iphlen > sizeof (struct ip)) {
125	ip_stripoptions(m, (struct mbuf *)0);
126	iphlen = sizeof(struct ip);
127	}
128
129	/*
130	* Get IP and UDP header together in first mbuf.
131	*/
132	ip = mtod(m, struct ip *);
133	if (m->m_len < iphlen + sizeof(struct udphdr)) {
134	if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
135	udpstat.udps_hdrops++;
136	return;
137	}
138	ip = mtod(m, struct ip *);
139	}
140	uh = (struct udphdr *)((caddr_t)ip + iphlen);
141
142	/*
143	* Make mbuf data length reflect UDP length.
144	* If not enough data to reflect UDP length, drop.
145	*/
146	len = ntohs((u_short)uh->uh_ulen);
147	if (ip->ip_len != len) {
148	if (len > ip->ip_len \|\| len < sizeof(struct udphdr)) {
149	udpstat.udps_badlen++;
150	goto bad;
151	}
152	m_adj(m, len - ip->ip_len);
153	/* ip->ip_len = len; */
154	}
155	/*
156	* Save a copy of the IP header in case we want restore it
157	* for sending an ICMP error message in response.
158	*/
159	save_ip = *ip;
160
161	/*
162	* Checksum extended UDP header and data.
163	*/
164	if (uh->uh_sum) {
165	((struct ipovly *)ip)->ih_next = 0;
166	((struct ipovly *)ip)->ih_prev = 0;
167	((struct ipovly *)ip)->ih_x1 = 0;
168	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
169	uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
170	if (uh->uh_sum) {
171	udpstat.udps_badsum++;
172	m_freem(m);
173	return;
174	}
175	}
176
177	if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) \|\|
178	in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
179	struct inpcb *last;
180	/*
181	* Deliver a multicast or broadcast datagram to all sockets
182	* for which the local and remote addresses and ports match
183	* those of the incoming datagram. This allows more than
184	* one process to receive multi/broadcasts on the same port.
185	* (This really ought to be done for unicast datagrams as
186	* well, but that would cause problems with existing
187	* applications that open both address-specific sockets and
188	* a wildcard socket listening to the same port -- they would
189	* end up receiving duplicates of every unicast datagram.
190	* Those applications open the multiple sockets to overcome an
191	* inadequacy of the UDP socket interface, but for backwards
192	* compatibility we avoid the problem here rather than
193	* fixing the interface. Maybe 4.5BSD will remedy this?)
194	*/
195
196	/*
197	* Construct sockaddr format source address.
198	*/
199	udp_in.sin_port = uh->uh_sport;
200	udp_in.sin_addr = ip->ip_src;
201	m->m_len -= sizeof (struct udpiphdr);
202	m->m_data += sizeof (struct udpiphdr);
203	/*
204	* Locate pcb(s) for datagram.
205	* (Algorithm copied from raw_intr().)
206	*/
207	last = NULL;
208	for (inp = udb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
209	if (inp->inp_lport != uh->uh_dport)
210	continue;
211	if (inp->inp_laddr.s_addr != INADDR_ANY) {
212	if (inp->inp_laddr.s_addr !=
213	ip->ip_dst.s_addr)
214	continue;
215	}
216	if (inp->inp_faddr.s_addr != INADDR_ANY) {
217	if (inp->inp_faddr.s_addr !=
218	ip->ip_src.s_addr \|\|
219	inp->inp_fport != uh->uh_sport)
220	continue;
221	}
222
223	if (last != NULL) {
224	struct mbuf *n;
225
226	if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
227	if (last->inp_flags & INP_CONTROLOPTS
228	\|\| last->inp_socket->so_options & SO_TIMESTAMP)
229	ip_savecontrol(last, &opts, ip, n);
230	if (sbappendaddr(&last->inp_socket->so_rcv,
231	(struct sockaddr *)&udp_in,
232	n, opts) == 0) {
233	m_freem(n);
234	if (opts)
235	m_freem(opts);
236	udpstat.udps_fullsock++;
237	} else
238	sorwakeup(last->inp_socket);
239	opts = 0;
240	}
241	}
242	last = inp;
243	/*
244	* Don't look for additional matches if this one does
245	* not have either the SO_REUSEPORT or SO_REUSEADDR
246	* socket options set. This heuristic avoids searching
247	* through all pcbs in the common case of a non-shared
248	* port. It * assumes that an application will never
249	* clear these options after setting them.
250	*/
251	if (((last->inp_socket->so_options&(SO_REUSEPORT\|SO_REUSEADDR)) == 0))
252	break;
253	}
254
255	if (last == NULL) {
256	/*
257	* No matching pcb found; discard datagram.
258	* (No need to send an ICMP Port Unreachable
259	* for a broadcast or multicast datgram.)
260	*/
261	udpstat.udps_noportbcast++;
262	goto bad;
263	}
264	if (last->inp_flags & INP_CONTROLOPTS
265	\|\| last->inp_socket->so_options & SO_TIMESTAMP)
266	ip_savecontrol(last, &opts, ip, m);
267	if (sbappendaddr(&last->inp_socket->so_rcv,
268	(struct sockaddr *)&udp_in,
269	m, opts) == 0) {
270	udpstat.udps_fullsock++;
271	goto bad;
272	}
273	sorwakeup(last->inp_socket);
274	return;
275	}
276	/*
277	* Locate pcb for datagram.
278	*/
279	inp = in_pcblookuphash(&udbinfo, ip->ip_src, uh->uh_sport,
280	ip->ip_dst, uh->uh_dport, 1);
281	if (inp == NULL) {
282	if (log_in_vain) {
283	char buf[4*sizeof "123"];
284
285	strcpy(buf, inet_ntoa(ip->ip_dst));
286	log(LOG_INFO, "Connection attempt to UDP %s:%d"
287	" from %s:%d\n",
288	buf, ntohs(uh->uh_dport),
289	inet_ntoa(ip->ip_src), ntohs(uh->uh_sport));
290	}
291	udpstat.udps_noport++;
292	if (m->m_flags & (M_BCAST \| M_MCAST)) {
293	udpstat.udps_noportbcast++;
294	goto bad;
295	}
296	*ip = save_ip;
297	icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
298	return;
299	}
300
301	/*
302	* Construct sockaddr format source address.
303	* Stuff source address and datagram in user buffer.
304	*/
305	udp_in.sin_port = uh->uh_sport;
306	udp_in.sin_addr = ip->ip_src;
307	if (inp->inp_flags & INP_CONTROLOPTS
308	\|\| inp->inp_socket->so_options & SO_TIMESTAMP)
309	ip_savecontrol(inp, &opts, ip, m);
310	iphlen += sizeof(struct udphdr);
311	m->m_len -= iphlen;
312	m->m_pkthdr.len -= iphlen;
313	m->m_data += iphlen;
314	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
315	m, opts) == 0) {
316	udpstat.udps_fullsock++;
317	goto bad;
318	}
319	sorwakeup(inp->inp_socket);
320	return;
321	bad:
322	m_freem(m);
323	if (opts)
324	m_freem(opts);
325	}
326
327	/*
328	* Notify a udp user of an asynchronous error;
329	* just wake up so that he can collect error status.
330	*/
331	static void
332	udp_notify(struct inpcb *inp, 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(int cmd, struct sockaddr sa, void vip)
341	{
342	register struct ip *ip = vip;
343	register struct udphdr *uh;
344
345	if (!PRC_IS_REDIRECT(cmd) &&
346	((unsigned)cmd >= PRC_NCMDS \|\| inetctlerrmap[cmd] == 0))
347	return;
348	if (ip) {
349	uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
350	in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
351	cmd, udp_notify);
352	} else
353	in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
354	}
355
356	static int
357	udp_output(struct inpcb inp, struct mbuf m, struct mbuf *addr,
358	struct mbuf *control)
359	{
360	register struct udpiphdr *ui;
361	register int len = m->m_pkthdr.len;
362	struct in_addr laddr;
363	int s = 0, error = 0;
364
365	laddr.s_addr = 0;
366	if (control)
367	m_freem(control); /* XXX */
368
369	if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
370	error = EMSGSIZE;
371	goto release;
372	}
373
374	if (addr) {
375	laddr = inp->inp_laddr;
376	if (inp->inp_faddr.s_addr != INADDR_ANY) {
377	error = EISCONN;
378	goto release;
379	}
380	/*
381	* Must block input while temporarily connected.
382	*/
383	s = splnet();
384	error = in_pcbconnect(inp, addr);
385	if (error) {
386	splx(s);
387	goto release;
388	}
389	} else {
390	if (inp->inp_faddr.s_addr == INADDR_ANY) {
391	error = ENOTCONN;
392	goto release;
393	}
394	}
395	/*
396	* Calculate data length and get a mbuf
397	* for UDP and IP headers.
398	*/
399	M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
400	if (m == 0) {
401	error = ENOBUFS;
402	if (addr) {
403	in_pcbdisconnect(inp);
404	inp->inp_laddr = laddr;
405	splx(s);
406	}
407	goto release;
408	}
409
410	/*
411	* Fill in mbuf with extended UDP header
412	* and addresses and length put into network format.
413	*/
414	ui = mtod(m, struct udpiphdr *);
415	ui->ui_next = ui->ui_prev = 0;
416	ui->ui_x1 = 0;
417	ui->ui_pr = IPPROTO_UDP;
418	ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
419	ui->ui_src = inp->inp_laddr;
420	ui->ui_dst = inp->inp_faddr;
421	ui->ui_sport = inp->inp_lport;
422	ui->ui_dport = inp->inp_fport;
423	ui->ui_ulen = ui->ui_len;
424
425	/*
426	* Stuff checksum and output datagram.
427	*/
428	ui->ui_sum = 0;
429	if (udpcksum) {
430	if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
431	ui->ui_sum = 0xffff;
432	}
433	((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
434	((struct ip )ui)->ip_ttl = inp->inp_ip_ttl; / XXX */
435	((struct ip )ui)->ip_tos = inp->inp_ip_tos; / XXX */
436	udpstat.udps_opackets++;
437	error = ip_output(m, inp->inp_options, &inp->inp_route,
438	inp->inp_socket->so_options & (SO_DONTROUTE \| SO_BROADCAST),
439	inp->inp_moptions);
440
441	if (addr) {
442	in_pcbdisconnect(inp);
443	inp->inp_laddr = laddr;
444	splx(s);
445	}
446	return (error);
447
448	release:
449	m_freem(m);
450	return (error);
451	}
452
453	#ifdef __rtems__
454	#define INP_INFO_RLOCK(a)
455	#define INP_INFO_RUNLOCK(a)
456	#define INP_LOCK(a)
457	#define INP_UNLOCK(a)
458	#endif
459
460	static int
461	udp_pcblist(SYSCTL_HANDLER_ARGS)
462	{
463	int error, i, n, s;
464	struct inpcb inp, *inp_list;
465	inp_gen_t gencnt;
466	struct xinpgen xig;
467
468	/*
469	* The process of preparing the TCB list is too time-consuming and
470	* resource-intensive to repeat twice on every request.
471	*/
472	if (req->oldptr == 0) {
473	n = udbinfo.ipi_count;
474	req->oldidx = 2 * (sizeof xig)
475	+ (n + n/8) * sizeof(struct xinpcb);
476	return 0;
477	}
478
479	if (req->newptr != 0)
480	return EPERM;
481
482	/*
483	* OK, now we're committed to doing something.
484	*/
485	s = splnet();
486	gencnt = udbinfo.ipi_gencnt;
487	n = udbinfo.ipi_count;
488	splx(s);
489
490	sysctl_wire_old_buffer(req, 2 * (sizeof xig)
491	+ n * sizeof(struct xinpcb));
492
493	xig.xig_len = sizeof xig;
494	xig.xig_count = n;
495	xig.xig_gen = gencnt;
496	#if 0
497	xig.xig_sogen = so_gencnt;
498	#endif
499	error = SYSCTL_OUT(req, &xig, sizeof xig);
500	if (error)
501	return error;
502
503	/* ccj add the exit if count is 0 */
504	if (!n)
505	return error;
506
507	inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
508	if (inp_list == 0)
509	return ENOMEM;
510
511	s = splnet();
512	INP_INFO_RLOCK(&udbinfo);
513	for (inp = LIST_FIRST(udbinfo.listhead), i = 0; inp && i < n;
514	inp = LIST_NEXT(inp, inp_list)) {
515	INP_LOCK(inp);
516	if (inp->inp_gencnt <= gencnt)
517	#if 0
518	&&
519	cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0)
520	#endif
521	inp_list[i++] = inp;
522	INP_UNLOCK(inp);
523	}
524	INP_INFO_RUNLOCK(&udbinfo);
525	splx(s);
526	n = i;
527
528	error = 0;
529	for (i = 0; i < n; i++) {
530	inp = inp_list[i];
531	INP_LOCK(inp);
532	if (inp->inp_gencnt <= gencnt) {
533	struct xinpcb xi;
534	xi.xi_len = sizeof xi;
535	/* XXX should avoid extra copy */
536	bcopy(inp, &xi.xi_inp, sizeof *inp);
537	#if 0
538	if (inp->inp_socket)
539	sotoxsocket(inp->inp_socket, &xi.xi_socket);
540	#endif
541	error = SYSCTL_OUT(req, &xi, sizeof xi);
542	}
543	INP_UNLOCK(inp);
544	}
545	if (!error) {
546	/*
547	* Give the user an updated idea of our state.
548	* If the generation differs from what we told
549	* her before, she knows that something happened
550	* while we were processing this request, and it
551	* might be necessary to retry.
552	*/
553	s = splnet();
554	INP_INFO_RLOCK(&udbinfo);
555	xig.xig_gen = udbinfo.ipi_gencnt;
556	#if 0
557	xig.xig_sogen = so_gencnt;
558	#endif
559	xig.xig_count = udbinfo.ipi_count;
560	INP_INFO_RUNLOCK(&udbinfo);
561	splx(s);
562	error = SYSCTL_OUT(req, &xig, sizeof xig);
563	}
564	free(inp_list, M_TEMP);
565	return error;
566	}
567
568	SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
569	udp_pcblist, "S,xinpcb", "List of active UDP sockets");
570
571	static u_long udp_sendspace = 9216; /* really max datagram size */
572	/* 40 1K datagrams */
573	SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
574	&udp_sendspace, 0, "");
575
576	static u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
577	SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
578	&udp_recvspace, 0, "");
579
580	#if defined(__rtems__)
581	void rtems_set_udp_buffer_sizes(u_long sendspace, u_long recvspace)
582	{
583	if ( sendspace != 0 )
584	udp_sendspace = sendspace;
585	if ( recvspace != 0 )
586	udp_recvspace = recvspace;
587	}
588	#endif
589
590	/ARGSUSED/
591	int
592	udp_usrreq(struct socket so, int req, struct mbuf m, struct mbuf *addr,
593	struct mbuf *control)
594	{
595	struct inpcb *inp = sotoinpcb(so);
596	int error = 0;
597	int s;
598
599	if (req == PRU_CONTROL)
600	return (in_control(so, (uintptr_t)m, (caddr_t)addr,
601	(struct ifnet *)control));
602	if (inp == NULL && req != PRU_ATTACH) {
603	error = EINVAL;
604	goto release;
605	}
606	/*
607	* Note: need to block udp_input while changing
608	* the udp pcb queue and/or pcb addresses.
609	*/
610	switch (req) {
611
612	case PRU_ATTACH:
613	if (inp != NULL) {
614	error = EINVAL;
615	break;
616	}
617	s = splnet();
618	error = in_pcballoc(so, &udbinfo);
619	splx(s);
620	if (error)
621	break;
622	error = soreserve(so, udp_sendspace, udp_recvspace);
623	if (error)
624	break;
625	((struct inpcb *) so->so_pcb)->inp_ip_ttl = ip_defttl;
626	break;
627
628	case PRU_DETACH:
629	udp_detach(inp);
630	break;
631
632	case PRU_BIND:
633	s = splnet();
634	error = in_pcbbind(inp, addr);
635	splx(s);
636	break;
637
638	case PRU_LISTEN:
639	error = EOPNOTSUPP;
640	break;
641
642	case PRU_CONNECT:
643	if (inp->inp_faddr.s_addr != INADDR_ANY) {
644	error = EISCONN;
645	break;
646	}
647	s = splnet();
648	error = in_pcbconnect(inp, addr);
649	splx(s);
650	if (error == 0)
651	soisconnected(so);
652	break;
653
654	case PRU_CONNECT2:
655	error = EOPNOTSUPP;
656	break;
657
658	case PRU_ACCEPT:
659	error = EOPNOTSUPP;
660	break;
661
662	case PRU_DISCONNECT:
663	if (inp->inp_faddr.s_addr == INADDR_ANY) {
664	error = ENOTCONN;
665	break;
666	}
667	s = splnet();
668	in_pcbdisconnect(inp);
669	inp->inp_laddr.s_addr = INADDR_ANY;
670	splx(s);
671	so->so_state &= ~SS_ISCONNECTED; /* XXX */
672	break;
673
674	case PRU_SHUTDOWN:
675	socantsendmore(so);
676	break;
677
678	case PRU_SEND:
679	return (udp_output(inp, m, addr, control));
680
681	case PRU_ABORT:
682	soisdisconnected(so);
683	udp_detach(inp);
684	break;
685
686	case PRU_SOCKADDR:
687	in_setsockaddr(inp, addr);
688	break;
689
690	case PRU_PEERADDR:
691	in_setpeeraddr(inp, addr);
692	break;
693
694	case PRU_SENSE:
695	/*
696	* stat: don't bother with a blocksize.
697	*/
698	return (0);
699
700	case PRU_SENDOOB:
701	case PRU_FASTTIMO:
702	case PRU_SLOWTIMO:
703	case PRU_PROTORCV:
704	case PRU_PROTOSEND:
705	error = EOPNOTSUPP;
706	break;
707
708	case PRU_RCVD:
709	case PRU_RCVOOB:
710	return (EOPNOTSUPP); /* do not free mbuf's */
711
712	default:
713	panic("udp_usrreq");
714	}
715
716	release:
717	if (control) {
718	printf("udp control data unexpectedly retained\n");
719	m_freem(control);
720	}
721	if (m)
722	m_freem(m);
723	return (error);
724	}
725
726	static void
727	udp_detach(struct inpcb *inp)
728	{
729	int s = splnet();
730
731	in_pcbdetach(inp);
732	splx(s);
733	}

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source: rtems/cpukit/libnetworking/netinet/udp_usrreq.c @ 45f9cd0

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