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source: rtems/cpukit/libnetworking/netinet/udp_usrreq.c @ f4ceef3e

4.104.114.84.95

Last change on this file since f4ceef3e was f4ceef3e, checked in by Joel Sherrill <joel.sherrill@…>, on 09/16/02 at 11:55:43

2002-09-16 Joel Sherrill <joel@…>

netinet/Makefile.am, netinet/udp_usrreq.c: Back off some of the IP_FORWARD patch as it appears to not compile in the current tree.

Property mode set to 100644

File size: 14.9 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	* 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 8.6 (Berkeley) 5/23/95
34	* $Id$
35	*/
36
37	#include <sys/param.h>
38	#include <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 <sys/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	static struct inpcbhead udb; /* from udp_var.h */
81	static 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 };
92
93	static void udp_detach __P((struct inpcb *));
94	static int udp_output __P((struct inpcb , struct mbuf , struct mbuf *,
95	struct mbuf *));
96	static void udp_notify __P((struct inpcb *, int));
97
98	void
99	udp_init()
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(m, iphlen)
108	register struct mbuf *m;
109	int iphlen;
110	{
111	register struct ip *ip;
112	register struct udphdr *uh;
113	register struct inpcb *inp;
114	struct mbuf *opts = 0;
115	int len;
116	struct ip save_ip;
117
118	udpstat.udps_ipackets++;
119
120	/*
121	* Strip IP options, if any; should skip this,
122	* make available to user, and use on returned packets,
123	* but we don't yet have a way to check the checksum
124	* with options still present.
125	*/
126	if (iphlen > sizeof (struct ip)) {
127	ip_stripoptions(m, (struct mbuf *)0);
128	iphlen = sizeof(struct ip);
129	}
130
131	/*
132	* Get IP and UDP header together in first mbuf.
133	*/
134	ip = mtod(m, struct ip *);
135	if (m->m_len < iphlen + sizeof(struct udphdr)) {
136	if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
137	udpstat.udps_hdrops++;
138	return;
139	}
140	ip = mtod(m, struct ip *);
141	}
142	uh = (struct udphdr *)((caddr_t)ip + iphlen);
143
144	/*
145	* Make mbuf data length reflect UDP length.
146	* If not enough data to reflect UDP length, drop.
147	*/
148	len = ntohs((u_short)uh->uh_ulen);
149	if (ip->ip_len != len) {
150	if (len > ip->ip_len \|\| len < sizeof(struct udphdr)) {
151	udpstat.udps_badlen++;
152	goto bad;
153	}
154	m_adj(m, len - ip->ip_len);
155	/* ip->ip_len = len; */
156	}
157	/*
158	* Save a copy of the IP header in case we want restore it
159	* for sending an ICMP error message in response.
160	*/
161	save_ip = *ip;
162
163	/*
164	* Checksum extended UDP header and data.
165	*/
166	if (uh->uh_sum) {
167	((struct ipovly *)ip)->ih_next = 0;
168	((struct ipovly *)ip)->ih_prev = 0;
169	((struct ipovly *)ip)->ih_x1 = 0;
170	((struct ipovly *)ip)->ih_len = uh->uh_ulen;
171	uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
172	if (uh->uh_sum) {
173	udpstat.udps_badsum++;
174	m_freem(m);
175	return;
176	}
177	}
178
179	if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) \|\|
180	in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
181	struct inpcb *last;
182	/*
183	* Deliver a multicast or broadcast datagram to all sockets
184	* for which the local and remote addresses and ports match
185	* those of the incoming datagram. This allows more than
186	* one process to receive multi/broadcasts on the same port.
187	* (This really ought to be done for unicast datagrams as
188	* well, but that would cause problems with existing
189	* applications that open both address-specific sockets and
190	* a wildcard socket listening to the same port -- they would
191	* end up receiving duplicates of every unicast datagram.
192	* Those applications open the multiple sockets to overcome an
193	* inadequacy of the UDP socket interface, but for backwards
194	* compatibility we avoid the problem here rather than
195	* fixing the interface. Maybe 4.5BSD will remedy this?)
196	*/
197
198	/*
199	* Construct sockaddr format source address.
200	*/
201	udp_in.sin_port = uh->uh_sport;
202	udp_in.sin_addr = ip->ip_src;
203	m->m_len -= sizeof (struct udpiphdr);
204	m->m_data += sizeof (struct udpiphdr);
205	/*
206	* Locate pcb(s) for datagram.
207	* (Algorithm copied from raw_intr().)
208	*/
209	last = NULL;
210	for (inp = udb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
211	if (inp->inp_lport != uh->uh_dport)
212	continue;
213	if (inp->inp_laddr.s_addr != INADDR_ANY) {
214	if (inp->inp_laddr.s_addr !=
215	ip->ip_dst.s_addr)
216	continue;
217	}
218	if (inp->inp_faddr.s_addr != INADDR_ANY) {
219	if (inp->inp_faddr.s_addr !=
220	ip->ip_src.s_addr \|\|
221	inp->inp_fport != uh->uh_sport)
222	continue;
223	}
224
225	if (last != NULL) {
226	struct mbuf *n;
227
228	if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
229	if (last->inp_flags & INP_CONTROLOPTS
230	\|\| last->inp_socket->so_options & SO_TIMESTAMP)
231	ip_savecontrol(last, &opts, ip, n);
232	if (sbappendaddr(&last->inp_socket->so_rcv,
233	(struct sockaddr *)&udp_in,
234	n, opts) == 0) {
235	m_freem(n);
236	if (opts)
237	m_freem(opts);
238	udpstat.udps_fullsock++;
239	} else
240	sorwakeup(last->inp_socket);
241	opts = 0;
242	}
243	}
244	last = inp;
245	/*
246	* Don't look for additional matches if this one does
247	* not have either the SO_REUSEPORT or SO_REUSEADDR
248	* socket options set. This heuristic avoids searching
249	* through all pcbs in the common case of a non-shared
250	* port. It * assumes that an application will never
251	* clear these options after setting them.
252	*/
253	if (((last->inp_socket->so_options&(SO_REUSEPORT\|SO_REUSEADDR)) == 0))
254	break;
255	}
256
257	if (last == NULL) {
258	/*
259	* No matching pcb found; discard datagram.
260	* (No need to send an ICMP Port Unreachable
261	* for a broadcast or multicast datgram.)
262	*/
263	udpstat.udps_noportbcast++;
264	goto bad;
265	}
266	if (last->inp_flags & INP_CONTROLOPTS
267	\|\| last->inp_socket->so_options & SO_TIMESTAMP)
268	ip_savecontrol(last, &opts, ip, m);
269	if (sbappendaddr(&last->inp_socket->so_rcv,
270	(struct sockaddr *)&udp_in,
271	m, opts) == 0) {
272	udpstat.udps_fullsock++;
273	goto bad;
274	}
275	sorwakeup(last->inp_socket);
276	return;
277	}
278	/*
279	* Locate pcb for datagram.
280	*/
281	inp = in_pcblookuphash(&udbinfo, ip->ip_src, uh->uh_sport,
282	ip->ip_dst, uh->uh_dport, 1);
283	if (inp == NULL) {
284	if (log_in_vain) {
285	char buf[4*sizeof "123"];
286
287	strcpy(buf, inet_ntoa(ip->ip_dst));
288	log(LOG_INFO, "Connection attempt to UDP %s:%d"
289	" from %s:%d\n",
290	buf, ntohs(uh->uh_dport),
291	inet_ntoa(ip->ip_src), ntohs(uh->uh_sport));
292	}
293	udpstat.udps_noport++;
294	if (m->m_flags & (M_BCAST \| M_MCAST)) {
295	udpstat.udps_noportbcast++;
296	goto bad;
297	}
298	*ip = save_ip;
299	icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
300	return;
301	}
302
303	/*
304	* Construct sockaddr format source address.
305	* Stuff source address and datagram in user buffer.
306	*/
307	udp_in.sin_port = uh->uh_sport;
308	udp_in.sin_addr = ip->ip_src;
309	if (inp->inp_flags & INP_CONTROLOPTS
310	\|\| inp->inp_socket->so_options & SO_TIMESTAMP)
311	ip_savecontrol(inp, &opts, ip, m);
312	iphlen += sizeof(struct udphdr);
313	m->m_len -= iphlen;
314	m->m_pkthdr.len -= iphlen;
315	m->m_data += iphlen;
316	if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
317	m, opts) == 0) {
318	udpstat.udps_fullsock++;
319	goto bad;
320	}
321	sorwakeup(inp->inp_socket);
322	return;
323	bad:
324	m_freem(m);
325	if (opts)
326	m_freem(opts);
327	}
328
329	/*
330	* Notify a udp user of an asynchronous error;
331	* just wake up so that he can collect error status.
332	*/
333	static void
334	udp_notify(inp, errnum)
335	register struct inpcb *inp;
336	int errnum;
337	{
338	inp->inp_socket->so_error = errnum;
339	sorwakeup(inp->inp_socket);
340	sowwakeup(inp->inp_socket);
341	}
342
343	void
344	udp_ctlinput(cmd, sa, vip)
345	int cmd;
346	struct sockaddr *sa;
347	void *vip;
348	{
349	register struct ip *ip = vip;
350	register struct udphdr *uh;
351
352	if (!PRC_IS_REDIRECT(cmd) &&
353	((unsigned)cmd >= PRC_NCMDS \|\| inetctlerrmap[cmd] == 0))
354	return;
355	if (ip) {
356	uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
357	in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
358	cmd, udp_notify);
359	} else
360	in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
361	}
362
363	static int
364	udp_output(inp, m, addr, control)
365	register struct inpcb *inp;
366	register struct mbuf *m;
367	struct mbuf addr, control;
368	{
369	register struct udpiphdr *ui;
370	register int len = m->m_pkthdr.len;
371	struct in_addr laddr;
372	int s = 0, error = 0;
373
374	if (control)
375	m_freem(control); /* XXX */
376
377	if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) {
378	error = EMSGSIZE;
379	goto release;
380	}
381
382	if (addr) {
383	laddr = inp->inp_laddr;
384	if (inp->inp_faddr.s_addr != INADDR_ANY) {
385	error = EISCONN;
386	goto release;
387	}
388	/*
389	* Must block input while temporarily connected.
390	*/
391	s = splnet();
392	error = in_pcbconnect(inp, addr);
393	if (error) {
394	splx(s);
395	goto release;
396	}
397	} else {
398	if (inp->inp_faddr.s_addr == INADDR_ANY) {
399	error = ENOTCONN;
400	goto release;
401	}
402	}
403	/*
404	* Calculate data length and get a mbuf
405	* for UDP and IP headers.
406	*/
407	M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
408	if (m == 0) {
409	error = ENOBUFS;
410	if (addr)
411	splx(s);
412	goto release;
413	}
414
415	/*
416	* Fill in mbuf with extended UDP header
417	* and addresses and length put into network format.
418	*/
419	ui = mtod(m, struct udpiphdr *);
420	ui->ui_next = ui->ui_prev = 0;
421	ui->ui_x1 = 0;
422	ui->ui_pr = IPPROTO_UDP;
423	ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
424	ui->ui_src = inp->inp_laddr;
425	ui->ui_dst = inp->inp_faddr;
426	ui->ui_sport = inp->inp_lport;
427	ui->ui_dport = inp->inp_fport;
428	ui->ui_ulen = ui->ui_len;
429
430	/*
431	* Stuff checksum and output datagram.
432	*/
433	ui->ui_sum = 0;
434	if (udpcksum) {
435	if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
436	ui->ui_sum = 0xffff;
437	}
438	((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
439	((struct ip )ui)->ip_ttl = inp->inp_ip_ttl; / XXX */
440	((struct ip )ui)->ip_tos = inp->inp_ip_tos; / XXX */
441	udpstat.udps_opackets++;
442	error = ip_output(m, inp->inp_options, &inp->inp_route,
443	inp->inp_socket->so_options & (SO_DONTROUTE \| SO_BROADCAST),
444	inp->inp_moptions);
445
446	if (addr) {
447	in_pcbdisconnect(inp);
448	inp->inp_laddr = laddr;
449	splx(s);
450	}
451	return (error);
452
453	release:
454	m_freem(m);
455	return (error);
456	}
457
458	static u_long udp_sendspace = 9216; /* really max datagram size */
459	/* 40 1K datagrams */
460	SYSCTL_INT(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW,
461	&udp_sendspace, 0, "");
462
463	static u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
464	SYSCTL_INT(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW,
465	&udp_recvspace, 0, "");
466
467	/ARGSUSED/
468	int
469	udp_usrreq(so, req, m, addr, control)
470	struct socket *so;
471	int req;
472	struct mbuf m, addr, *control;
473	{
474	struct inpcb *inp = sotoinpcb(so);
475	int error = 0;
476	int s;
477
478	if (req == PRU_CONTROL)
479	return (in_control(so, (u_long)m, (caddr_t)addr,
480	(struct ifnet *)control));
481	if (inp == NULL && req != PRU_ATTACH) {
482	error = EINVAL;
483	goto release;
484	}
485	/*
486	* Note: need to block udp_input while changing
487	* the udp pcb queue and/or pcb addresses.
488	*/
489	switch (req) {
490
491	case PRU_ATTACH:
492	if (inp != NULL) {
493	error = EINVAL;
494	break;
495	}
496	s = splnet();
497	error = in_pcballoc(so, &udbinfo);
498	splx(s);
499	if (error)
500	break;
501	error = soreserve(so, udp_sendspace, udp_recvspace);
502	if (error)
503	break;
504	((struct inpcb *) so->so_pcb)->inp_ip_ttl = ip_defttl;
505	break;
506
507	case PRU_DETACH:
508	udp_detach(inp);
509	break;
510
511	case PRU_BIND:
512	s = splnet();
513	error = in_pcbbind(inp, addr);
514	splx(s);
515	break;
516
517	case PRU_LISTEN:
518	error = EOPNOTSUPP;
519	break;
520
521	case PRU_CONNECT:
522	if (inp->inp_faddr.s_addr != INADDR_ANY) {
523	error = EISCONN;
524	break;
525	}
526	s = splnet();
527	error = in_pcbconnect(inp, addr);
528	splx(s);
529	if (error == 0)
530	soisconnected(so);
531	break;
532
533	case PRU_CONNECT2:
534	error = EOPNOTSUPP;
535	break;
536
537	case PRU_ACCEPT:
538	error = EOPNOTSUPP;
539	break;
540
541	case PRU_DISCONNECT:
542	if (inp->inp_faddr.s_addr == INADDR_ANY) {
543	error = ENOTCONN;
544	break;
545	}
546	s = splnet();
547	in_pcbdisconnect(inp);
548	inp->inp_laddr.s_addr = INADDR_ANY;
549	splx(s);
550	so->so_state &= ~SS_ISCONNECTED; /* XXX */
551	break;
552
553	case PRU_SHUTDOWN:
554	socantsendmore(so);
555	break;
556
557	case PRU_SEND:
558	return (udp_output(inp, m, addr, control));
559
560	case PRU_ABORT:
561	soisdisconnected(so);
562	udp_detach(inp);
563	break;
564
565	case PRU_SOCKADDR:
566	in_setsockaddr(inp, addr);
567	break;
568
569	case PRU_PEERADDR:
570	in_setpeeraddr(inp, addr);
571	break;
572
573	case PRU_SENSE:
574	/*
575	* stat: don't bother with a blocksize.
576	*/
577	return (0);
578
579	case PRU_SENDOOB:
580	case PRU_FASTTIMO:
581	case PRU_SLOWTIMO:
582	case PRU_PROTORCV:
583	case PRU_PROTOSEND:
584	error = EOPNOTSUPP;
585	break;
586
587	case PRU_RCVD:
588	case PRU_RCVOOB:
589	return (EOPNOTSUPP); /* do not free mbuf's */
590
591	default:
592	panic("udp_usrreq");
593	}
594
595	release:
596	if (control) {
597	printf("udp control data unexpectedly retained\n");
598	m_freem(control);
599	}
600	if (m)
601	m_freem(m);
602	return (error);
603	}
604
605	static void
606	udp_detach(inp)
607	struct inpcb *inp;
608	{
609	int s = splnet();
610
611	in_pcbdetach(inp);
612	splx(s);
613	}

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