[unix-history] / usr / src / sys / netinet / in_pcb.c

/*	in_pcb.c	4.30	82/07/24	*/

#include "../h/param.h"
#include "../h/systm.h"
#include "../h/dir.h"
#include "../h/user.h"
#include "../h/mbuf.h"
#include "../h/socket.h"
#include "../h/socketvar.h"
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/route.h"
#include "../net/in_pcb.h"
#include "../h/protosw.h"

/*
 * Routines to manage internet protocol control blocks.
 *
 * At PRU_ATTACH time a protocol control block is allocated in
 * in_pcballoc() and inserted on a doubly-linked list of such blocks
 * for the protocol.  A port address is either requested (and verified
 * to not be in use) or assigned at this time.  We also allocate
 * space in the socket sockbuf structures here, although this is
 * not a clearly correct place to put this function.
 *
 * A connectionless protocol will have its protocol control block
 * removed at PRU_DETACH time, when the socket will be freed (freeing
 * the space reserved) and the block will be removed from the list of
 * blocks for its protocol.
 *
 * A connection-based protocol may be connected to a remote peer at
 * PRU_CONNECT time through the routine in_pcbconnect().  In the normal
 * case a PRU_DISCONNECT occurs causing a in_pcbdisconnect().
 * It is also possible that higher-level routines will opt out of the
 * relationship with the connection before the connection shut down
 * is complete.  This often occurs in protocols like TCP where we must
 * hold on to the protocol control block for a unreasonably long time
 * after the connection is used up to avoid races in later connection
 * establishment.  To handle this we allow higher-level routines to
 * disassociate themselves from the socket, marking it SS_NOFDREF while
 * the disconnect is in progress.  We notice that this has happened
 * when the disconnect is complete, and perform the PRU_DETACH operation,
 * freeing the socket.
 *
 * TODO:
 *	use hashing
 */
struct	in_addr zeroin_addr;

in_pcbreserve(so, sndcc, rcvcc)
	struct socket *so;
	int sndcc, rcvcc;
{

	if (sbreserve(&so->so_snd, sndcc) == 0)
		goto bad;
	if (sbreserve(&so->so_rcv, rcvcc) == 0)
		goto bad2;
	return (0);
bad2:
	sbrelease(&so->so_snd);
bad:
	return (ENOBUFS);
}

in_pcballoc(so, head)
	struct socket *so;
	struct inpcb *head;
{
	struct mbuf *m;
	register struct inpcb *inp;

	m = m_getclr(M_DONTWAIT);
	if (m == 0)
		return (ENOBUFS);
	inp = mtod(m, struct inpcb *);
	inp->inp_head = head;
	inp->inp_socket = so;
	insque(inp, head);
	so->so_pcb = (caddr_t)inp;
	return (0);
}
	
in_pcbbind(inp, sin)
	register struct inpcb *inp;
	struct sockaddr_in *sin;
{
	register struct socket *so = inp->inp_socket;
	register struct inpcb *head = inp->inp_head;
	u_short lport = 0;

	if (ifnet == 0)
		return (EADDRNOTAVAIL);
	if (sin) {
		if (sin->sin_family != AF_INET)
			return (EAFNOSUPPORT);
		if (sin->sin_addr.s_addr) {
			int tport = sin->sin_port;

			sin->sin_port = 0;		/* yech... */
			if (if_ifwithaddr((struct sockaddr *)sin) == 0)
				return (EADDRNOTAVAIL);
			sin->sin_port = tport;
		}
		lport = sin->sin_port;
		if (lport) {
			u_short aport = lport;
			int wild = 0;
#if vax
			aport = htons(aport);
#endif
			/* GROSS */
			if (aport < IPPORT_RESERVED && u.u_uid != 0)
				return (EACCES);
			if ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
			    (so->so_options & SO_ACCEPTCONN) == 0)
				wild = INPLOOKUP_WILDCARD;
			if (in_pcblookup(head,
			    zeroin_addr, 0, sin->sin_addr, lport, wild))
				return (EADDRINUSE);
		}
	}
	if (sin)
		inp->inp_laddr = sin->sin_addr;
	if (lport == 0)
		do {
			if (head->inp_lport++ < IPPORT_RESERVED)
				head->inp_lport = IPPORT_RESERVED;
			lport = htons(head->inp_lport);
		} while (in_pcblookup(head,
			    zeroin_addr, 0, inp->inp_laddr, lport, 0));
	inp->inp_lport = lport;
	return (0);
}

/* BEGIN DEPRECATED */
/*
 * Allocate a protocol control block, space
 * for send and receive data, and local host information.
 * Return error.  If no error make socket point at pcb.
 */
in_pcbattach(so, head, sndcc, rcvcc, sin)
	struct socket *so;
	struct inpcb *head;
	int sndcc, rcvcc;
	struct sockaddr_in *sin;
{
	struct mbuf *m;
	register struct inpcb *inp;
	u_short lport = 0;

	if (ifnet == 0)
		return (EADDRNOTAVAIL);
	if (sin) {
		if (sin->sin_family != AF_INET)
			return (EAFNOSUPPORT);
		if (sin->sin_addr.s_addr) {
			int tport = sin->sin_port;

			sin->sin_port = 0;		/* yech... */
			if (if_ifwithaddr((struct sockaddr *)sin) == 0)
				return (EADDRNOTAVAIL);
			sin->sin_port = tport;
		}
		lport = sin->sin_port;
		if (lport) {
			u_short aport = lport;
			int wild = 0;
#if vax
			aport = htons(aport);
#endif
			/* GROSS */
			if (aport < IPPORT_RESERVED && u.u_uid != 0)
				return (EACCES);
			if ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
			    (so->so_options & SO_ACCEPTCONN) == 0)
				wild = INPLOOKUP_WILDCARD;
			if (in_pcblookup(head,
			    zeroin_addr, 0, sin->sin_addr, lport, wild))
				return (EADDRINUSE);
		}
	}
	m = m_getclr(M_DONTWAIT);
	if (m == 0)
		return (ENOBUFS);
	if (sbreserve(&so->so_snd, sndcc) == 0)
		goto bad;
	if (sbreserve(&so->so_rcv, rcvcc) == 0)
		goto bad2;
	inp = mtod(m, struct inpcb *);
	inp->inp_head = head;
	if (sin)
		inp->inp_laddr = sin->sin_addr;
	if (lport == 0)
		do {
			if (head->inp_lport++ < IPPORT_RESERVED)
				head->inp_lport = IPPORT_RESERVED;
			lport = htons(head->inp_lport);
		} while (in_pcblookup(head,
			    zeroin_addr, 0, inp->inp_laddr, lport, 0));
	inp->inp_lport = lport;
	inp->inp_socket = so;
	insque(inp, head);
	so->so_pcb = (caddr_t)inp;
	return (0);
bad2:
	sbrelease(&so->so_snd);
bad:
	(void) m_free(m);
	return (ENOBUFS);
}
/* END DEPRECATED */

/*
 * Connect from a socket to a specified address.
 * Both address and port must be specified in argument sin.
 * If don't have a local address for this socket yet,
 * then pick one.
 */
in_pcbconnect(inp, sin)
	struct inpcb *inp;
	struct sockaddr_in *sin;
{
	struct ifnet *ifp;
	struct sockaddr_in *ifaddr;

	if (sin->sin_family != AF_INET)
		return (EAFNOSUPPORT);
	if (sin->sin_addr.s_addr == 0 || sin->sin_port == 0)
		return (EADDRNOTAVAIL);
	if (inp->inp_laddr.s_addr == 0) {
		ifp = if_ifonnetof(in_netof(sin->sin_addr));
		if (ifp == 0) {
			/*
			 * We should select the interface based on
			 * the route to be used, but for udp this would
			 * result in two calls to rtalloc for each packet
			 * sent; hardly worthwhile...
			 */
			ifp = if_ifwithaf(AF_INET);
			if (ifp == 0)
				return (EADDRNOTAVAIL);
		}
		ifaddr = (struct sockaddr_in *)&ifp->if_addr;
	}
	if (in_pcblookup(inp->inp_head,
	    sin->sin_addr,
	    sin->sin_port,
	    inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
	    inp->inp_lport,
	    0))
		return (EADDRINUSE);
	if (inp->inp_laddr.s_addr == 0)
		inp->inp_laddr = ifaddr->sin_addr;
	inp->inp_faddr = sin->sin_addr;
	inp->inp_fport = sin->sin_port;
	return (0);
}

in_pcbdisconnect(inp)
	struct inpcb *inp;
{

	inp->inp_faddr.s_addr = 0;
	inp->inp_fport = 0;
	if (inp->inp_socket->so_state & SS_NOFDREF)
		in_pcbdetach(inp);
}

in_pcbdetach(inp)
	struct inpcb *inp;
{
	struct socket *so = inp->inp_socket;

	so->so_pcb = 0;
	sofree(so);
	if (inp->inp_route.ro_rt)
		rtfree(inp->inp_route.ro_rt);
	remque(inp);
	(void) m_free(dtom(inp));
}

in_setsockaddr(sin, inp)
	register struct sockaddr_in *sin;
	register struct inpcb *inp;
{
	if (sin == 0 || inp == 0)
		panic("setsockaddr_in");
	bzero((caddr_t)sin, sizeof (*sin));
	sin->sin_family = AF_INET;
	sin->sin_port = inp->inp_lport;
	sin->sin_addr = inp->inp_laddr;
}

/*
 * Pass an error to all internet connections
 * associated with address sin.  Call the
 * protocol specific routine to clean up the
 * mess afterwards.
 */
in_pcbnotify(head, dst, errno, abort)
	struct inpcb *head;
	register struct in_addr *dst;
	int errno, (*abort)();
{
	register struct inpcb *inp, *oinp;
	int s = splimp();

	for (inp = head->inp_next; inp != head;) {
		if (inp->inp_faddr.s_addr != dst->s_addr) {
	next:
			inp = inp->inp_next;
			continue;
		}
		if (inp->inp_socket == 0)
			goto next;
		inp->inp_socket->so_error = errno;
		oinp = inp;
		inp = inp->inp_next;
		(*abort)(oinp);
	}
	splx(s);
}

/*
 * SHOULD ALLOW MATCH ON MULTI-HOMING ONLY
 */
struct inpcb *
in_pcblookup(head, faddr, fport, laddr, lport, flags)
	struct inpcb *head;
	struct in_addr faddr, laddr;
	u_short fport, lport;
	int flags;
{
	register struct inpcb *inp, *match = 0;
	int matchwild = 3, wildcard;

	for (inp = head->inp_next; inp != head; inp = inp->inp_next) {
		if (inp->inp_lport != lport)
			continue;
		wildcard = 0;
		if (inp->inp_laddr.s_addr != 0) {
			if (laddr.s_addr == 0)
				wildcard++;
			else if (inp->inp_laddr.s_addr != laddr.s_addr)
				continue;
		} else {
			if (laddr.s_addr != 0)
				wildcard++;
		}
		if (inp->inp_faddr.s_addr != 0) {
			if (faddr.s_addr == 0)
				wildcard++;
			else if (inp->inp_faddr.s_addr != faddr.s_addr ||
			    inp->inp_fport != fport)
				continue;
		} else {
			if (faddr.s_addr != 0)
				wildcard++;
		}
		if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0)
			continue;
		if (wildcard < matchwild) {
			match = inp;
			matchwild = wildcard;
			if (matchwild == 0)
				break;
		}
	}
	return (match);
}
Commit	Line	Data
66035116	1	/* in_pcb.c 4.30 82/07/24 */
af092e86 BJ	2
af092e86 BJ	3	#include "../h/param.h"
4ad99bae BJ	4	#include "../h/systm.h"
	5	#include "../h/dir.h"
	6	#include "../h/user.h"
af092e86 BJ	7	#include "../h/mbuf.h"
	8	#include "../h/socket.h"
	9	#include "../h/socketvar.h"
8a13b737 BJ	10	#include "../net/in.h"
8a13b737 BJ	11	#include "../net/in_systm.h"
4ad99bae	12	#include "../net/if.h"
c124e997	13	#include "../net/route.h"
8a13b737	14	#include "../net/in_pcb.h"
1acff8ec	15	#include "../h/protosw.h"
af092e86	16
405c9168 BJ	17	/*
	18	* Routines to manage internet protocol control blocks.
	19	*
	20	* At PRU_ATTACH time a protocol control block is allocated in
	21	* in_pcballoc() and inserted on a doubly-linked list of such blocks
	22	* for the protocol. A port address is either requested (and verified
	23	* to not be in use) or assigned at this time. We also allocate
	24	* space in the socket sockbuf structures here, although this is
	25	* not a clearly correct place to put this function.
	26	*
	27	* A connectionless protocol will have its protocol control block
	28	* removed at PRU_DETACH time, when the socket will be freed (freeing
	29	* the space reserved) and the block will be removed from the list of
	30	* blocks for its protocol.
	31	*
	32	* A connection-based protocol may be connected to a remote peer at
	33	* PRU_CONNECT time through the routine in_pcbconnect(). In the normal
	34	* case a PRU_DISCONNECT occurs causing a in_pcbdisconnect().
	35	* It is also possible that higher-level routines will opt out of the
	36	* relationship with the connection before the connection shut down
	37	* is complete. This often occurs in protocols like TCP where we must
	38	* hold on to the protocol control block for a unreasonably long time
	39	* after the connection is used up to avoid races in later connection
	40	* establishment. To handle this we allow higher-level routines to
8f0d18de	41	* disassociate themselves from the socket, marking it SS_NOFDREF while
405c9168 BJ	42	* the disconnect is in progress. We notice that this has happened
	43	* when the disconnect is complete, and perform the PRU_DETACH operation,
	44	* freeing the socket.
b454c3ea BJ	45	*
	46	* TODO:
	47	* use hashing
405c9168	48	*/
1a3dbf93	49	struct in_addr zeroin_addr;
405c9168	50
8f0d18de BJ	51	in_pcbreserve(so, sndcc, rcvcc)
	52	struct socket *so;
	53	int sndcc, rcvcc;
	54	{
	55
	56	if (sbreserve(&so->so_snd, sndcc) == 0)
	57	goto bad;
	58	if (sbreserve(&so->so_rcv, rcvcc) == 0)
	59	goto bad2;
	60	return (0);
	61	bad2:
	62	sbrelease(&so->so_snd);
	63	bad:
	64	return (ENOBUFS);
	65	}
	66
	67	in_pcballoc(so, head)
	68	struct socket *so;
	69	struct inpcb *head;
	70	{
	71	struct mbuf *m;
	72	register struct inpcb *inp;
	73
	74	m = m_getclr(M_DONTWAIT);
	75	if (m == 0)
	76	return (ENOBUFS);
	77	inp = mtod(m, struct inpcb *);
	78	inp->inp_head = head;
	79	inp->inp_socket = so;
	80	insque(inp, head);
	81	so->so_pcb = (caddr_t)inp;
	82	return (0);
	83	}
	84
	85	in_pcbbind(inp, sin)
	86	register struct inpcb *inp;
	87	struct sockaddr_in *sin;
	88	{
	89	register struct socket *so = inp->inp_socket;
	90	register struct inpcb *head = inp->inp_head;
	91	u_short lport = 0;
	92
	93	if (ifnet == 0)
	94	return (EADDRNOTAVAIL);
	95	if (sin) {
	96	if (sin->sin_family != AF_INET)
	97	return (EAFNOSUPPORT);
	98	if (sin->sin_addr.s_addr) {
	99	int tport = sin->sin_port;
	100
	101	sin->sin_port = 0; /* yech... */
	102	if (if_ifwithaddr((struct sockaddr *)sin) == 0)
	103	return (EADDRNOTAVAIL);
	104	sin->sin_port = tport;
	105	}
	106	lport = sin->sin_port;
	107	if (lport) {
	108	u_short aport = lport;
	109	int wild = 0;
	110	#if vax
	111	aport = htons(aport);
	112	#endif
	113	/* GROSS */
	114	if (aport < IPPORT_RESERVED && u.u_uid != 0)
115	return (EACCES);
116	if ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 \|\|
117	(so->so_options & SO_ACCEPTCONN) == 0)
118	wild = INPLOOKUP_WILDCARD;
119	if (in_pcblookup(head,
120	zeroin_addr, 0, sin->sin_addr, lport, wild))
121	return (EADDRINUSE);
122	}
123	}
124	if (sin)
125	inp->inp_laddr = sin->sin_addr;
126	if (lport == 0)
127	do {
128	if (head->inp_lport++ < IPPORT_RESERVED)
129	head->inp_lport = IPPORT_RESERVED;
130	lport = htons(head->inp_lport);
131	} while (in_pcblookup(head,
132	zeroin_addr, 0, inp->inp_laddr, lport, 0));
133	inp->inp_lport = lport;
134	return (0);
135	}
136
137	/* BEGIN DEPRECATED */
4ad99bae BJ	138	/*
	139	* Allocate a protocol control block, space
	140	* for send and receive data, and local host information.
	141	* Return error. If no error make socket point at pcb.
	142	*/
405c9168	143	in_pcbattach(so, head, sndcc, rcvcc, sin)
4ad99bae BJ	144	struct socket *so;
	145	struct inpcb *head;
	146	int sndcc, rcvcc;
	147	struct sockaddr_in *sin;
af092e86	148	{
af092e86	149	struct mbuf *m;
1a3dbf93	150	register struct inpcb *inp;
1aa87517	151	u_short lport = 0;
af092e86	152
1aa87517 BJ	153	if (ifnet == 0)
1aa87517 BJ	154	return (EADDRNOTAVAIL);
4ad99bae BJ	155	if (sin) {
	156	if (sin->sin_family != AF_INET)
	157	return (EAFNOSUPPORT);
c124e997 SL	158	if (sin->sin_addr.s_addr) {
	159	int tport = sin->sin_port;
	160
	161	sin->sin_port = 0; /* yech... */
	162	if (if_ifwithaddr((struct sockaddr *)sin) == 0)
	163	return (EADDRNOTAVAIL);
	164	sin->sin_port = tport;
	165	}
4ad99bae	166	lport = sin->sin_port;
1aa87517 BJ	167	if (lport) {
1aa87517 BJ	168	u_short aport = lport;
1acff8ec	169	int wild = 0;
1aa87517 BJ	170	#if vax
	171	aport = htons(aport);
	172	#endif
	173	/* GROSS */
	174	if (aport < IPPORT_RESERVED && u.u_uid != 0)
72e4f44e	175	return (EACCES);
1acff8ec BJ	176	if ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 \|\|
	177	(so->so_options & SO_ACCEPTCONN) == 0)
	178	wild = INPLOOKUP_WILDCARD;
1aa87517	179	if (in_pcblookup(head,
1acff8ec	180	zeroin_addr, 0, sin->sin_addr, lport, wild))
1aa87517 BJ	181	return (EADDRINUSE);
1aa87517 BJ	182	}
4ad99bae	183	}
e6b33a03	184	m = m_getclr(M_DONTWAIT);
4ad99bae	185	if (m == 0)
7545cf09	186	return (ENOBUFS);
4ad99bae BJ	187	if (sbreserve(&so->so_snd, sndcc) == 0)
	188	goto bad;
	189	if (sbreserve(&so->so_rcv, rcvcc) == 0)
	190	goto bad2;
	191	inp = mtod(m, struct inpcb *);
b454c3ea	192	inp->inp_head = head;
1aa87517 BJ	193	if (sin)
1aa87517 BJ	194	inp->inp_laddr = sin->sin_addr;
b454c3ea BJ	195	if (lport == 0)
b454c3ea BJ	196	do {
1aa87517 BJ	197	if (head->inp_lport++ < IPPORT_RESERVED)
1aa87517 BJ	198	head->inp_lport = IPPORT_RESERVED;
b454c3ea	199	lport = htons(head->inp_lport);
1aa87517 BJ	200	} while (in_pcblookup(head,
1aa87517 BJ	201	zeroin_addr, 0, inp->inp_laddr, lport, 0));
4ad99bae	202	inp->inp_lport = lport;
b454c3ea	203	inp->inp_socket = so;
7545cf09	204	insque(inp, head);
4ad99bae BJ	205	so->so_pcb = (caddr_t)inp;
	206	return (0);
	207	bad2:
	208	sbrelease(&so->so_snd);
	209	bad:
2752c877	210	(void) m_free(m);
4ad99bae	211	return (ENOBUFS);
af092e86	212	}
8f0d18de	213	/* END DEPRECATED */
af092e86	214
1acff8ec BJ	215	/*
	216	* Connect from a socket to a specified address.
	217	* Both address and port must be specified in argument sin.
	218	* If don't have a local address for this socket yet,
	219	* then pick one.
	220	*/
405c9168	221	in_pcbconnect(inp, sin)
4ad99bae BJ	222	struct inpcb *inp;
4ad99bae BJ	223	struct sockaddr_in *sin;
2b4b57cd	224	{
1aa87517	225	struct ifnet *ifp;
ee787340	226	struct sockaddr_in *ifaddr;
2b4b57cd	227
4ad99bae BJ	228	if (sin->sin_family != AF_INET)
	229	return (EAFNOSUPPORT);
	230	if (sin->sin_addr.s_addr == 0 \|\| sin->sin_port == 0)
	231	return (EADDRNOTAVAIL);
1aa87517	232	if (inp->inp_laddr.s_addr == 0) {
6187f8f4	233	ifp = if_ifonnetof(in_netof(sin->sin_addr));
ee787340	234	if (ifp == 0) {
72e4f44e SL	235	/*
	236	* We should select the interface based on
	237	* the route to be used, but for udp this would
	238	* result in two calls to rtalloc for each packet
	239	* sent; hardly worthwhile...
	240	*/
ee787340 SL	241	ifp = if_ifwithaf(AF_INET);
ee787340 SL	242	if (ifp == 0)
72e4f44e	243	return (EADDRNOTAVAIL);
ee787340 SL	244	}
ee787340 SL	245	ifaddr = (struct sockaddr_in *)&ifp->if_addr;
1aa87517 BJ	246	}
1aa87517 BJ	247	if (in_pcblookup(inp->inp_head,
1acff8ec BJ	248	sin->sin_addr,
1acff8ec BJ	249	sin->sin_port,
ee787340	250	inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
1acff8ec BJ	251	inp->inp_lport,
1acff8ec BJ	252	0))
b454c3ea	253	return (EADDRINUSE);
126472ab	254	if (inp->inp_laddr.s_addr == 0)
ee787340	255	inp->inp_laddr = ifaddr->sin_addr;
4ad99bae BJ	256	inp->inp_faddr = sin->sin_addr;
4ad99bae BJ	257	inp->inp_fport = sin->sin_port;
2b4b57cd BJ	258	return (0);
	259	}
	260
405c9168 BJ	261	in_pcbdisconnect(inp)
	262	struct inpcb *inp;
	263	{
	264
405c9168	265	inp->inp_faddr.s_addr = 0;
ebcadd38	266	inp->inp_fport = 0;
8f0d18de	267	if (inp->inp_socket->so_state & SS_NOFDREF)
405c9168 BJ	268	in_pcbdetach(inp);
	269	}
	270
	271	in_pcbdetach(inp)
af092e86 BJ	272	struct inpcb *inp;
	273	{
	274	struct socket *so = inp->inp_socket;
	275
ba55c9af BJ	276	so->so_pcb = 0;
ba55c9af BJ	277	sofree(so);
c124e997	278	if (inp->inp_route.ro_rt)
f6311fb6	279	rtfree(inp->inp_route.ro_rt);
7545cf09	280	remque(inp);
cdad2eb1	281	(void) m_free(dtom(inp));
af092e86 BJ	282	}
af092e86 BJ	283
126472ab SL	284	in_setsockaddr(sin, inp)
	285	register struct sockaddr_in *sin;
	286	register struct inpcb *inp;
	287	{
	288	if (sin == 0 \|\| inp == 0)
	289	panic("setsockaddr_in");
	290	bzero((caddr_t)sin, sizeof (*sin));
	291	sin->sin_family = AF_INET;
	292	sin->sin_port = inp->inp_lport;
	293	sin->sin_addr = inp->inp_laddr;
	294	}
	295
72e4f44e SL	296	/*
	297	* Pass an error to all internet connections
	298	* associated with address sin. Call the
	299	* protocol specific routine to clean up the
	300	* mess afterwards.
	301	*/
	302	in_pcbnotify(head, dst, errno, abort)
	303	struct inpcb *head;
	304	register struct in_addr *dst;
	305	int errno, (*abort)();
	306	{
	307	register struct inpcb inp, oinp;
	308	int s = splimp();
	309
72e4f44e SL	310	for (inp = head->inp_next; inp != head;) {
	311	if (inp->inp_faddr.s_addr != dst->s_addr) {
	312	next:
	313	inp = inp->inp_next;
	314	continue;
	315	}
	316	if (inp->inp_socket == 0)
	317	goto next;
	318	inp->inp_socket->so_error = errno;
	319	oinp = inp;
	320	inp = inp->inp_next;
	321	(*abort)(oinp);
	322	}
	323	splx(s);
	324	}
	325
405c9168	326	/*
1aa87517	327	* SHOULD ALLOW MATCH ON MULTI-HOMING ONLY
405c9168	328	*/
cdad2eb1	329	struct inpcb *
ebcadd38	330	in_pcblookup(head, faddr, fport, laddr, lport, flags)
af092e86	331	struct inpcb *head;
4ad99bae	332	struct in_addr faddr, laddr;
af092e86	333	u_short fport, lport;
ebcadd38	334	int flags;
af092e86	335	{
1aa87517 BJ	336	register struct inpcb inp, match = 0;
1aa87517 BJ	337	int matchwild = 3, wildcard;
af092e86	338
405c9168	339	for (inp = head->inp_next; inp != head; inp = inp->inp_next) {
1aa87517	340	if (inp->inp_lport != lport)
405c9168	341	continue;
1aa87517 BJ	342	wildcard = 0;
1aa87517 BJ	343	if (inp->inp_laddr.s_addr != 0) {
1acff8ec BJ	344	if (laddr.s_addr == 0)
	345	wildcard++;
	346	else if (inp->inp_laddr.s_addr != laddr.s_addr)
1aa87517 BJ	347	continue;
	348	} else {
	349	if (laddr.s_addr != 0)
	350	wildcard++;
	351	}
	352	if (inp->inp_faddr.s_addr != 0) {
1acff8ec BJ	353	if (faddr.s_addr == 0)
	354	wildcard++;
	355	else if (inp->inp_faddr.s_addr != faddr.s_addr \|\|
ebcadd38	356	inp->inp_fport != fport)
1aa87517 BJ	357	continue;
	358	} else {
	359	if (faddr.s_addr != 0)
	360	wildcard++;
	361	}
ebcadd38	362	if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0)
405c9168	363	continue;
1aa87517 BJ	364	if (wildcard < matchwild) {
	365	match = inp;
	366	matchwild = wildcard;
	367	if (matchwild == 0)
	368	break;
405c9168	369	}
1aa87517	370	}
405c9168	371	return (match);
af092e86	372	}