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source: rtems/cpukit/libnetworking/netinet/in_pcb.c @ dd967330

4.104.114.95

Last change on this file since dd967330 was dd967330, checked in by Ralf Corsepius <ralf.corsepius@…>, on 09/01/08 at 06:36:17
Stop using old-style function definitions.
Property mode set to `100644`
File size: 20.6 KB

Line
1	/*
2	* Copyright (c) 1982, 1986, 1991, 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	* @(#)in_pcb.c 8.4 (Berkeley) 5/24/95
30	* $FreeBSD: src/sys/netinet/in_pcb.c,v 1.158 2005/01/07 01:45:44 imp Exp $
31	*/
32
33	/*
34	* $Id$
35	*/
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 <sys/ioctl.h>
46	#include <sys/errno.h>
47	#include <sys/time.h>
48	#include <sys/proc.h>
49	#include <sys/kernel.h>
50	#include <sys/sysctl.h>
51
52	#include <net/if.h>
53	#include <net/route.h>
54
55	#include <netinet/in.h>
56	#include <netinet/in_systm.h>
57	#include <netinet/ip.h>
58	#include <netinet/in_pcb.h>
59	#include <netinet/in_var.h>
60	#include <netinet/ip_var.h>
61
62	struct in_addr zeroin_addr;
63
64	static void in_pcbinshash(struct inpcb *);
65	static void in_rtchange(struct inpcb *, int);
66
67	/*
68	* These configure the range of local port addresses assigned to
69	* "unspecified" outgoing connections/packets/whatever.
70	*/
71	static int ipport_lowfirstauto = IPPORT_RESERVED - 1; /* 1023 */
72	static int ipport_lowlastauto = IPPORT_RESERVEDSTART; /* 600 */
73	static int ipport_firstauto = IPPORT_RESERVED; /* 1024 */
74	static int ipport_lastauto = IPPORT_USERRESERVED; /* 5000 */
75	static int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; /* 40000 */
76	static int ipport_hilastauto = IPPORT_HILASTAUTO; /* 44999 */
77
78	#define RANGECHK(var, min, max) \
79	if ((var) < (min)) { (var) = (min); } \
80	else if ((var) > (max)) { (var) = (max); }
81
82	static int
83	sysctl_net_ipport_check(SYSCTL_HANDLER_ARGS)
84	{
85	int error = sysctl_handle_int(oidp,
86	oidp->oid_arg1, oidp->oid_arg2, req);
87	if (!error) {
88	RANGECHK(ipport_lowfirstauto, 1, IPPORT_RESERVED - 1);
89	RANGECHK(ipport_lowlastauto, 1, IPPORT_RESERVED - 1);
90	RANGECHK(ipport_firstauto, IPPORT_RESERVED, USHRT_MAX);
91	RANGECHK(ipport_lastauto, IPPORT_RESERVED, USHRT_MAX);
92	RANGECHK(ipport_hifirstauto, IPPORT_RESERVED, USHRT_MAX);
93	RANGECHK(ipport_hilastauto, IPPORT_RESERVED, USHRT_MAX);
94	}
95	return error;
96	}
97
98	#undef RANGECHK
99
100	SYSCTL_NODE(_net_inet_ip, IPPROTO_IP, portrange, CTLFLAG_RW, 0, "IP Ports");
101
102	SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowfirst, CTLTYPE_INT\|CTLFLAG_RW,
103	&ipport_lowfirstauto, 0, &sysctl_net_ipport_check, "I", "");
104	SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, lowlast, CTLTYPE_INT\|CTLFLAG_RW,
105	&ipport_lowlastauto, 0, &sysctl_net_ipport_check, "I", "");
106	SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, first, CTLTYPE_INT\|CTLFLAG_RW,
107	&ipport_firstauto, 0, &sysctl_net_ipport_check, "I", "");
108	SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, last, CTLTYPE_INT\|CTLFLAG_RW,
109	&ipport_lastauto, 0, &sysctl_net_ipport_check, "I", "");
110	SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hifirst, CTLTYPE_INT\|CTLFLAG_RW,
111	&ipport_hifirstauto, 0, &sysctl_net_ipport_check, "I", "");
112	SYSCTL_PROC(_net_inet_ip_portrange, OID_AUTO, hilast, CTLTYPE_INT\|CTLFLAG_RW,
113	&ipport_hilastauto, 0, &sysctl_net_ipport_check, "I", "");
114
115	int
116	in_pcballoc(struct socket so, struct inpcbinfo pcbinfo)
117	{
118	register struct inpcb *inp;
119	int s;
120
121	MALLOC(inp, struct inpcb , sizeof(inp), M_PCB, M_NOWAIT);
122	if (inp == NULL)
123	return (ENOBUFS);
124	bzero((caddr_t)inp, sizeof(*inp));
125	inp->inp_gencnt = ++pcbinfo->ipi_gencnt;
126	inp->inp_pcbinfo = pcbinfo;
127	inp->inp_socket = so;
128	s = splnet();
129	LIST_INSERT_HEAD(pcbinfo->listhead, inp, inp_list);
130	pcbinfo->ipi_count++;
131	in_pcbinshash(inp);
132	splx(s);
133	so->so_pcb = (caddr_t)inp;
134	return (0);
135	}
136
137	int
138	in_pcbbind(struct inpcb inp, struct mbuf nam)
139	{
140	register struct socket *so = inp->inp_socket;
141	unsigned short *lastport;
142	struct sockaddr_in *sin;
143	u_short lport = 0;
144	int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
145	int error;
146
147	if (in_ifaddr == 0)
148	return (EADDRNOTAVAIL);
149	if (inp->inp_lport \|\| inp->inp_laddr.s_addr != INADDR_ANY)
150	return (EINVAL);
151	if ((so->so_options & (SO_REUSEADDR\|SO_REUSEPORT)) == 0 &&
152	((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 \|\|
153	(so->so_options & SO_ACCEPTCONN) == 0))
154	wild = 1;
155	if (nam) {
156	sin = mtod(nam, struct sockaddr_in *);
157	if (nam->m_len != sizeof (*sin))
158	return (EINVAL);
159	#ifdef notdef
160	/*
161	* We should check the family, but old programs
162	* incorrectly fail to initialize it.
163	*/
164	if (sin->sin_family != AF_INET)
165	return (EAFNOSUPPORT);
166	#endif
167	lport = sin->sin_port;
168	if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) {
169	/*
170	* Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
171	* allow complete duplication of binding if
172	* SO_REUSEPORT is set, or if SO_REUSEADDR is set
173	* and a multicast address is bound on both
174	* new and duplicated sockets.
175	*/
176	if (so->so_options & SO_REUSEADDR)
177	reuseport = SO_REUSEADDR\|SO_REUSEPORT;
178	} else if (sin->sin_addr.s_addr != INADDR_ANY) {
179	sin->sin_port = 0; /* yech... */
180	if (ifa_ifwithaddr((struct sockaddr *)sin) == 0)
181	return (EADDRNOTAVAIL);
182	}
183	if (lport) {
184	struct inpcb *t;
185
186	/* GROSS */
187	if (ntohs(lport) < IPPORT_RESERVED &&
188	(error = suser(p->p_ucred, &p->p_acflag)))
189	return (EACCES);
190	if (so->so_uid) {
191	t = in_pcblookup(inp->inp_pcbinfo, zeroin_addr,
192	0, sin->sin_addr, lport,
193	INPLOOKUP_WILDCARD);
194	if (t && (so->so_uid != t->inp_socket->so_uid))
195	return (EADDRINUSE);
196	}
197	t = in_pcblookup(inp->inp_pcbinfo, zeroin_addr, 0,
198	sin->sin_addr, lport, wild);
199	if (t && (reuseport & t->inp_socket->so_options) == 0)
200	return (EADDRINUSE);
201	}
202	inp->inp_laddr = sin->sin_addr;
203	}
204	if (lport == 0) {
205	ushort first, last;
206	int count;
207
208	inp->inp_flags \|= INP_ANONPORT;
209
210	if (inp->inp_flags & INP_HIGHPORT) {
211	first = ipport_hifirstauto; /* sysctl */
212	last = ipport_hilastauto;
213	lastport = &inp->inp_pcbinfo->lasthi;
214	} else if (inp->inp_flags & INP_LOWPORT) {
215	if ((error = suser(p->p_ucred, &p->p_acflag)))
216	return (EACCES);
217	first = ipport_lowfirstauto; /* 1023 */
218	last = ipport_lowlastauto; /* 600 */
219	lastport = &inp->inp_pcbinfo->lastlow;
220	} else {
221	first = ipport_firstauto; /* sysctl */
222	last = ipport_lastauto;
223	lastport = &inp->inp_pcbinfo->lastport;
224	}
225	/*
226	* Simple check to ensure all ports are not used up causing
227	* a deadlock here.
228	*
229	* We split the two cases (up and down) so that the direction
230	* is not being tested on each round of the loop.
231	*/
232	if (first > last) {
233	/*
234	* counting down
235	*/
236	count = first - last;
237
238	do {
239	if (count-- <= 0) /* completely used? */
240	return (EADDRNOTAVAIL);
241	--*lastport;
242	if (lastport > first \|\| lastport < last)
243	*lastport = first;
244	lport = htons(*lastport);
245	} while (in_pcblookup(inp->inp_pcbinfo,
246	zeroin_addr, 0, inp->inp_laddr, lport, wild));
247	} else {
248	/*
249	* counting up
250	*/
251	count = last - first;
252
253	do {
254	if (count-- <= 0) /* completely used? */
255	return (EADDRNOTAVAIL);
256	++*lastport;
257	if (lastport < first \|\| lastport > last)
258	*lastport = first;
259	lport = htons(*lastport);
260	} while (in_pcblookup(inp->inp_pcbinfo,
261	zeroin_addr, 0, inp->inp_laddr, lport, wild));
262	}
263	}
264	inp->inp_lport = lport;
265	in_pcbrehash(inp);
266	return (0);
267	}
268
269	/*
270	* Transform old in_pcbconnect() into an inner subroutine for new
271	* in_pcbconnect(): Do some validity-checking on the remote
272	* address (in mbuf 'nam') and then determine local host address
273	* (i.e., which interface) to use to access that remote host.
274	*
275	* This preserves definition of in_pcbconnect(), while supporting a
276	* slightly different version for T/TCP. (This is more than
277	* a bit of a kludge, but cleaning up the internal interfaces would
278	* have forced minor changes in every protocol).
279	*/
280
281	int
282	in_pcbladdr(struct inpcb inp, struct mbuf nam, struct sockaddr_in **plocal_sin)
283	{
284	struct in_ifaddr *ia;
285	register struct sockaddr_in sin = mtod(nam, struct sockaddr_in );
286
287	if (nam->m_len != sizeof (*sin))
288	return (EINVAL);
289	if (sin->sin_family != AF_INET)
290	return (EAFNOSUPPORT);
291	if (sin->sin_port == 0)
292	return (EADDRNOTAVAIL);
293	if (in_ifaddr) {
294	/*
295	* If the destination address is INADDR_ANY,
296	* use the primary local address.
297	* If the supplied address is INADDR_BROADCAST,
298	* and the primary interface supports broadcast,
299	* choose the broadcast address for that interface.
300	*/
301	#define satosin(sa) ((struct sockaddr_in *)(sa))
302	#define sintosa(sin) ((struct sockaddr *)(sin))
303	#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
304	if (sin->sin_addr.s_addr == INADDR_ANY)
305	sin->sin_addr = IA_SIN(in_ifaddr)->sin_addr;
306	else if (sin->sin_addr.s_addr == (u_long)INADDR_BROADCAST &&
307	(in_ifaddr->ia_ifp->if_flags & IFF_BROADCAST))
308	sin->sin_addr = satosin(&in_ifaddr->ia_broadaddr)->sin_addr;
309	}
310	if (inp->inp_laddr.s_addr == INADDR_ANY) {
311	register struct route *ro;
312
313	ia = (struct in_ifaddr *)0;
314	/*
315	* If route is known or can be allocated now,
316	* our src addr is taken from the i/f, else punt.
317	*/
318	ro = &inp->inp_route;
319	if (ro->ro_rt &&
320	(satosin(&ro->ro_dst)->sin_addr.s_addr !=
321	sin->sin_addr.s_addr \|\|
322	inp->inp_socket->so_options & SO_DONTROUTE)) {
323	RTFREE(ro->ro_rt);
324	ro->ro_rt = (struct rtentry *)0;
325	}
326	if ((inp->inp_socket->so_options & SO_DONTROUTE) == 0 && /XXX/
327	(ro->ro_rt == (struct rtentry *)0 \|\|
328	ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
329	/* No route yet, so try to acquire one */
330	ro->ro_dst.sa_family = AF_INET;
331	ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
332	((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
333	sin->sin_addr;
334	rtalloc(ro);
335	}
336	/*
337	* If we found a route, use the address
338	* corresponding to the outgoing interface
339	* unless it is the loopback (in case a route
340	* to our address on another net goes to loopback).
341	*/
342	if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK))
343	ia = ifatoia(ro->ro_rt->rt_ifa);
344	if (ia == 0) {
345	u_short fport = sin->sin_port;
346
347	sin->sin_port = 0;
348	ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin)));
349	if (ia == 0)
350	ia = ifatoia(ifa_ifwithnet(sintosa(sin)));
351	sin->sin_port = fport;
352	if (ia == 0)
353	ia = in_ifaddr;
354	if (ia == 0)
355	return (EADDRNOTAVAIL);
356	}
357	/*
358	* If the destination address is multicast and an outgoing
359	* interface has been set as a multicast option, use the
360	* address of that interface as our source address.
361	*/
362	if (IN_MULTICAST(ntohl(sin->sin_addr.s_addr)) &&
363	inp->inp_moptions != NULL) {
364	struct ip_moptions *imo;
365	struct ifnet *ifp;
366
367	imo = inp->inp_moptions;
368	if (imo->imo_multicast_ifp != NULL) {
369	ifp = imo->imo_multicast_ifp;
370	for (ia = in_ifaddr; ia; ia = ia->ia_next)
371	if (ia->ia_ifp == ifp)
372	break;
373	if (ia == 0)
374	return (EADDRNOTAVAIL);
375	}
376	}
377	/*
378	* Don't do pcblookup call here; return interface in plocal_sin
379	* and exit to caller, that will do the lookup.
380	*/
381	*plocal_sin = &ia->ia_addr;
382
383	}
384	return(0);
385	}
386
387	/*
388	* Outer subroutine:
389	* Connect from a socket to a specified address.
390	* Both address and port must be specified in argument sin.
391	* If don't have a local address for this socket yet,
392	* then pick one.
393	*/
394	int
395	in_pcbconnect(struct inpcb inp, struct mbuf nam)
396	{
397	struct sockaddr_in *ifaddr;
398	register struct sockaddr_in sin = mtod(nam, struct sockaddr_in );
399	int error;
400
401	/*
402	* Call inner routine, to assign local interface address.
403	*/
404	if ((error = in_pcbladdr(inp, nam, &ifaddr)))
405	return(error);
406
407	if (in_pcblookuphash(inp->inp_pcbinfo, sin->sin_addr, sin->sin_port,
408	inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
409	inp->inp_lport, 0) != NULL)
410	return (EADDRINUSE);
411	if (inp->inp_laddr.s_addr == INADDR_ANY) {
412	if (inp->inp_lport == 0)
413	(void)in_pcbbind(inp, (struct mbuf *)0);
414	inp->inp_laddr = ifaddr->sin_addr;
415	}
416	inp->inp_faddr = sin->sin_addr;
417	inp->inp_fport = sin->sin_port;
418	in_pcbrehash(inp);
419	return (0);
420	}
421
422	void
423	in_pcbdisconnect(struct inpcb *inp)
424	{
425
426	inp->inp_faddr.s_addr = INADDR_ANY;
427	inp->inp_fport = 0;
428	in_pcbrehash(inp);
429	if (inp->inp_socket->so_state & SS_NOFDREF)
430	in_pcbdetach(inp);
431	}
432
433	void
434	in_pcbdetach(struct inpcb *inp)
435	{
436	struct socket *so = inp->inp_socket;
437	struct inpcbinfo *ipi = inp->inp_pcbinfo;
438	int s;
439
440	inp->inp_gencnt = ++ipi->ipi_gencnt;
441	so->so_pcb = 0;
442	sofree(so);
443	if (inp->inp_options)
444	(void)m_free(inp->inp_options);
445	if (inp->inp_route.ro_rt)
446	rtfree(inp->inp_route.ro_rt);
447	ip_freemoptions(inp->inp_moptions);
448	s = splnet();
449	LIST_REMOVE(inp, inp_hash);
450	LIST_REMOVE(inp, inp_list);
451	splx(s);
452	FREE(inp, M_PCB);
453	}
454
455	void
456	in_setsockaddr(struct inpcb inp, struct mbuf nam)
457	{
458	register struct sockaddr_in *sin;
459
460	nam->m_len = sizeof (*sin);
461	sin = mtod(nam, struct sockaddr_in *);
462	bzero((caddr_t)sin, sizeof (*sin));
463	sin->sin_family = AF_INET;
464	sin->sin_len = sizeof(*sin);
465	sin->sin_port = inp->inp_lport;
466	sin->sin_addr = inp->inp_laddr;
467	}
468
469	void
470	in_setpeeraddr(struct inpcb inp, struct mbuf nam)
471	{
472	register struct sockaddr_in *sin;
473
474	nam->m_len = sizeof (*sin);
475	sin = mtod(nam, struct sockaddr_in *);
476	bzero((caddr_t)sin, sizeof (*sin));
477	sin->sin_family = AF_INET;
478	sin->sin_len = sizeof(*sin);
479	sin->sin_port = inp->inp_fport;
480	sin->sin_addr = inp->inp_faddr;
481	}
482
483	/*
484	* Pass some notification to all connections of a protocol
485	* associated with address dst. The local address and/or port numbers
486	* may be specified to limit the search. The "usual action" will be
487	* taken, depending on the ctlinput cmd. The caller must filter any
488	* cmds that are uninteresting (e.g., no error in the map).
489	* Call the protocol specific routine (if any) to report
490	* any errors for each matching socket.
491	*
492	* Must be called at splnet.
493	*/
494	void
495	in_pcbnotify(struct inpcbhead head, struct sockaddr dst, u_int fport_arg,
496	struct in_addr laddr, u_int lport_arg, int cmd,
497	void (notify)(struct inpcb , int))
498	{
499	register struct inpcb inp, oinp;
500	struct in_addr faddr;
501	u_short fport = fport_arg, lport = lport_arg;
502	int errnum, s;
503
504	if ((unsigned)cmd > PRC_NCMDS \|\| dst->sa_family != AF_INET)
505	return;
506	faddr = ((struct sockaddr_in *)dst)->sin_addr;
507	if (faddr.s_addr == INADDR_ANY)
508	return;
509
510	/*
511	* Redirects go to all references to the destination,
512	* and use in_rtchange to invalidate the route cache.
513	* Dead host indications: notify all references to the destination.
514	* Otherwise, if we have knowledge of the local port and address,
515	* deliver only to that socket.
516	*/
517	if (PRC_IS_REDIRECT(cmd) \|\| cmd == PRC_HOSTDEAD) {
518	fport = 0;
519	lport = 0;
520	laddr.s_addr = 0;
521	if (cmd != PRC_HOSTDEAD)
522	notify = in_rtchange;
523	}
524	errnum = inetctlerrmap[cmd];
525	s = splnet();
526	for (inp = head->lh_first; inp != NULL;) {
527	if (inp->inp_faddr.s_addr != faddr.s_addr \|\|
528	inp->inp_socket == 0 \|\|
529	(lport && inp->inp_lport != lport) \|\|
530	(laddr.s_addr && inp->inp_laddr.s_addr != laddr.s_addr) \|\|
531	(fport && inp->inp_fport != fport)) {
532	inp = inp->inp_list.le_next;
533	continue;
534	}
535	oinp = inp;
536	inp = inp->inp_list.le_next;
537	if (notify)
538	(*notify)(oinp, errnum);
539	}
540	splx(s);
541	}
542
543	/*
544	* Check for alternatives when higher level complains
545	* about service problems. For now, invalidate cached
546	* routing information. If the route was created dynamically
547	* (by a redirect), time to try a default gateway again.
548	*/
549	void
550	in_losing(struct inpcb *inp)
551	{
552	register struct rtentry *rt;
553	struct rt_addrinfo info;
554
555	if ((rt = inp->inp_route.ro_rt)) {
556	inp->inp_route.ro_rt = 0;
557	bzero((caddr_t)&info, sizeof(info));
558	info.rti_info[RTAX_DST] =
559	(struct sockaddr *)&inp->inp_route.ro_dst;
560	info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
561	info.rti_info[RTAX_NETMASK] = rt_mask(rt);
562	rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
563	if (rt->rt_flags & RTF_DYNAMIC)
564	(void) rtrequest(RTM_DELETE, rt_key(rt),
565	rt->rt_gateway, rt_mask(rt), rt->rt_flags,
566	(struct rtentry **)0);
567	else
568	/*
569	* A new route can be allocated
570	* the next time output is attempted.
571	*/
572	rtfree(rt);
573	}
574	}
575
576	/*
577	* After a routing change, flush old routing
578	* and allocate a (hopefully) better one.
579	*/
580	static void
581	in_rtchange(struct inpcb *inp, int errnum)
582	{
583	if (inp->inp_route.ro_rt) {
584	rtfree(inp->inp_route.ro_rt);
585	inp->inp_route.ro_rt = 0;
586	/*
587	* A new route can be allocated the next time
588	* output is attempted.
589	*/
590	}
591	}
592
593	struct inpcb *
594	in_pcblookup(struct inpcbinfo *pcbinfo,
595	struct in_addr faddr, u_int fport_arg,
596	struct in_addr laddr, u_int lport_arg,
597	int wild_okay)
598	{
599	register struct inpcb inp, match = NULL;
600	int matchwild = 3, wildcard;
601	u_short fport = fport_arg, lport = lport_arg;
602	int s;
603
604	s = splnet();
605
606	for (inp = pcbinfo->listhead->lh_first; inp != NULL; inp = inp->inp_list.le_next) {
607	if (inp->inp_lport != lport)
608	continue;
609	wildcard = 0;
610	if (inp->inp_faddr.s_addr != INADDR_ANY) {
611	if (faddr.s_addr == INADDR_ANY)
612	wildcard++;
613	else if (inp->inp_faddr.s_addr != faddr.s_addr \|\|
614	inp->inp_fport != fport)
615	continue;
616	} else {
617	if (faddr.s_addr != INADDR_ANY)
618	wildcard++;
619	}
620	if (inp->inp_laddr.s_addr != INADDR_ANY) {
621	if (laddr.s_addr == INADDR_ANY)
622	wildcard++;
623	else if (inp->inp_laddr.s_addr != laddr.s_addr)
624	continue;
625	} else {
626	if (laddr.s_addr != INADDR_ANY)
627	wildcard++;
628	}
629	if (wildcard && wild_okay == 0)
630	continue;
631	if (wildcard < matchwild) {
632	match = inp;
633	matchwild = wildcard;
634	if (matchwild == 0) {
635	break;
636	}
637	}
638	}
639	splx(s);
640	return (match);
641	}
642
643	/*
644	* Lookup PCB in hash list.
645	*/
646	struct inpcb *
647	in_pcblookuphash(struct inpcbinfo *pcbinfo,
648	struct in_addr faddr, u_int fport_arg,
649	struct in_addr laddr, u_int lport_arg,
650	int wildcard)
651	{
652	struct inpcbhead *head;
653	register struct inpcb *inp;
654	u_short fport = fport_arg, lport = lport_arg;
655	int s;
656
657	s = splnet();
658	/*
659	* First look for an exact match.
660	*/
661	head = &pcbinfo->hashbase[INP_PCBHASH(faddr.s_addr, lport, fport, pcbinfo->hashmask)];
662	for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
663	if (inp->inp_faddr.s_addr == faddr.s_addr &&
664	inp->inp_laddr.s_addr == laddr.s_addr &&
665	inp->inp_fport == fport &&
666	inp->inp_lport == lport)
667	goto found;
668	}
669	if (wildcard) {
670	struct inpcb *local_wild = NULL;
671
672	head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->hashmask)];
673	for (inp = head->lh_first; inp != NULL; inp = inp->inp_hash.le_next) {
674	if (inp->inp_faddr.s_addr == INADDR_ANY &&
675	inp->inp_fport == 0 && inp->inp_lport == lport) {
676	if (inp->inp_laddr.s_addr == laddr.s_addr)
677	goto found;
678	else if (inp->inp_laddr.s_addr == INADDR_ANY)
679	local_wild = inp;
680	}
681	}
682	if (local_wild != NULL) {
683	inp = local_wild;
684	goto found;
685	}
686	}
687	splx(s);
688	return (NULL);
689
690	found:
691	/*
692	* Move PCB to head of this hash chain so that it can be
693	* found more quickly in the future.
694	* XXX - this is a pessimization on machines with few
695	* concurrent connections.
696	*/
697	if (inp != head->lh_first) {
698	LIST_REMOVE(inp, inp_hash);
699	LIST_INSERT_HEAD(head, inp, inp_hash);
700	}
701	splx(s);
702	return (inp);
703	}
704
705	/*
706	* Insert PCB into hash chain. Must be called at splnet.
707	*/
708	static void
709	in_pcbinshash(struct inpcb *inp)
710	{
711	struct inpcbhead *head;
712
713	head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
714	inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
715
716	LIST_INSERT_HEAD(head, inp, inp_hash);
717	}
718
719	void
720	in_pcbrehash(struct inpcb *inp)
721	{
722	struct inpcbhead *head;
723	int s;
724
725	s = splnet();
726	LIST_REMOVE(inp, inp_hash);
727
728	head = &inp->inp_pcbinfo->hashbase[INP_PCBHASH(inp->inp_faddr.s_addr,
729	inp->inp_lport, inp->inp_fport, inp->inp_pcbinfo->hashmask)];
730
731	LIST_INSERT_HEAD(head, inp, inp_hash);
732	inp->inp_pcbinfo->ipi_count--;
733	splx(s);
734	}

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