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

/*
 * Copyright (c) 1982, 1986, 1991 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)in.c	7.24 (Berkeley) %G%
 */

#include "param.h"
#include "ioctl.h"
#include "errno.h"
#include "mbuf.h"
#include "socket.h"
#include "socketvar.h"
#include "in_systm.h"
#include "net/if.h"
#include "net/route.h"
#include "net/af.h"
#include "in.h"
#include "in_var.h"

#ifdef INET
/*
 * Formulate an Internet address from network + host.
 */
struct in_addr
in_makeaddr(net, host)
	u_long net, host;
{
	register struct in_ifaddr *ia;
	register u_long mask;
	u_long addr;

	if (IN_CLASSA(net))
		mask = IN_CLASSA_HOST;
	else if (IN_CLASSB(net))
		mask = IN_CLASSB_HOST;
	else
		mask = IN_CLASSC_HOST;
	for (ia = in_ifaddr; ia; ia = ia->ia_next)
		if ((ia->ia_netmask & net) == ia->ia_net) {
			mask = ~ia->ia_subnetmask;
			break;
		}
	addr = htonl(net | (host & mask));
	return (*(struct in_addr *)&addr);
}

/*
 * Return the network number from an internet address.
 */
u_long
in_netof(in)
	struct in_addr in;
{
	register u_long i = ntohl(in.s_addr);
	register u_long net;
	register struct in_ifaddr *ia;

	if (IN_CLASSA(i))
		net = i & IN_CLASSA_NET;
	else if (IN_CLASSB(i))
		net = i & IN_CLASSB_NET;
	else if (IN_CLASSC(i))
		net = i & IN_CLASSC_NET;
	else
		return (0);

	/*
	 * Check whether network is a subnet;
	 * if so, return subnet number.
	 */
	for (ia = in_ifaddr; ia; ia = ia->ia_next)
		if (net == ia->ia_net)
			return (i & ia->ia_subnetmask);
	return (net);
}

/*
 * Compute and save network mask as sockaddr from an internet address.
 */
in_sockmaskof(in, sockmask)
	struct in_addr in;
	register struct sockaddr_in *sockmask;
{
	register u_long net;
	register u_long mask;
    {
	register u_long i = ntohl(in.s_addr);

	if (i == 0)
		net = 0, mask = 0;
	else if (IN_CLASSA(i))
		net = i & IN_CLASSA_NET, mask = IN_CLASSA_NET;
	else if (IN_CLASSB(i))
		net = i & IN_CLASSB_NET, mask = IN_CLASSB_NET;
	else if (IN_CLASSC(i))
		net = i & IN_CLASSC_NET, mask = IN_CLASSC_NET;
	else
		net = i, mask = -1;
    }
    {
	register struct in_ifaddr *ia;
	/*
	 * Check whether network is a subnet;
	 * if so, return subnet number.
	 */
	for (ia = in_ifaddr; ia; ia = ia->ia_next)
		if (net == ia->ia_net)
			mask =  ia->ia_subnetmask;
    }
    {
	register char *cpbase = (char *)&(sockmask->sin_addr);
	register char *cp = (char *)(1 + &(sockmask->sin_addr));

	sockmask->sin_addr.s_addr = htonl(mask);
	sockmask->sin_len = 0;
	while (--cp >= cpbase)
		if (*cp) {
			sockmask->sin_len = 1 + cp - (caddr_t)sockmask;
			break;
		}
    }
}

/*
 * Return the host portion of an internet address.
 */
u_long
in_lnaof(in)
	struct in_addr in;
{
	register u_long i = ntohl(in.s_addr);
	register u_long net, host;
	register struct in_ifaddr *ia;

	if (IN_CLASSA(i)) {
		net = i & IN_CLASSA_NET;
		host = i & IN_CLASSA_HOST;
	} else if (IN_CLASSB(i)) {
		net = i & IN_CLASSB_NET;
		host = i & IN_CLASSB_HOST;
	} else if (IN_CLASSC(i)) {
		net = i & IN_CLASSC_NET;
		host = i & IN_CLASSC_HOST;
	} else
		return (i);

	/*
	 * Check whether network is a subnet;
	 * if so, use the modified interpretation of `host'.
	 */
	for (ia = in_ifaddr; ia; ia = ia->ia_next)
		if (net == ia->ia_net)
			return (host &~ ia->ia_subnetmask);
	return (host);
}

#ifndef SUBNETSARELOCAL
#define	SUBNETSARELOCAL	1
#endif
int subnetsarelocal = SUBNETSARELOCAL;
/*
 * Return 1 if an internet address is for a ``local'' host
 * (one to which we have a connection).  If subnetsarelocal
 * is true, this includes other subnets of the local net.
 * Otherwise, it includes only the directly-connected (sub)nets.
 */
in_localaddr(in)
	struct in_addr in;
{
	register u_long i = ntohl(in.s_addr);
	register struct in_ifaddr *ia;

	if (subnetsarelocal) {
		for (ia = in_ifaddr; ia; ia = ia->ia_next)
			if ((i & ia->ia_netmask) == ia->ia_net)
				return (1);
	} else {
		for (ia = in_ifaddr; ia; ia = ia->ia_next)
			if ((i & ia->ia_subnetmask) == ia->ia_subnet)
				return (1);
	}
	return (0);
}

/*
 * Determine whether an IP address is in a reserved set of addresses
 * that may not be forwarded, or whether datagrams to that destination
 * may be forwarded.
 */
in_canforward(in)
	struct in_addr in;
{
	register u_long i = ntohl(in.s_addr);
	register u_long net;

	if (IN_EXPERIMENTAL(i))
		return (0);
	if (IN_CLASSA(i)) {
		net = i & IN_CLASSA_NET;
		if (net == 0 || net == IN_LOOPBACKNET)
			return (0);
	}
	return (1);
}

int	in_interfaces;		/* number of external internet interfaces */
extern	struct ifnet loif;

/*
 * Generic internet control operations (ioctl's).
 * Ifp is 0 if not an interface-specific ioctl.
 */
/* ARGSUSED */
in_control(so, cmd, data, ifp)
	struct socket *so;
	int cmd;
	caddr_t data;
	register struct ifnet *ifp;
{
	register struct ifreq *ifr = (struct ifreq *)data;
	register struct in_ifaddr *ia = 0;
	register struct ifaddr *ifa;
	struct in_ifaddr *oia;
	struct in_aliasreq *ifra = (struct in_aliasreq *)data;
	struct sockaddr_in oldaddr;
	int error, hostIsNew, maskIsNew;
	u_long i;

	/*
	 * Find address for this interface, if it exists.
	 */
	if (ifp)
		for (ia = in_ifaddr; ia; ia = ia->ia_next)
			if (ia->ia_ifp == ifp)
				break;

	switch (cmd) {

	case SIOCAIFADDR:
	case SIOCDIFADDR:
		if (ifra->ifra_addr.sin_family == AF_INET)
		    for (oia = ia; ia; ia = ia->ia_next) {
			if (ia->ia_ifp == ifp  &&
			    ia->ia_addr.sin_addr.s_addr ==
				ifra->ifra_addr.sin_addr.s_addr)
			    break;
		}
		if (cmd == SIOCDIFADDR && ia == 0)
			return (EADDRNOTAVAIL);
		/* FALLTHROUGH */
	case SIOCSIFADDR:
	case SIOCSIFNETMASK:
	case SIOCSIFDSTADDR:
		if ((so->so_state & SS_PRIV) == 0)
			return (EPERM);

		if (ifp == 0)
			panic("in_control");
		if (ia == (struct in_ifaddr *)0) {
			oia = (struct in_ifaddr *)
				malloc(sizeof *oia, M_IFADDR, M_WAITOK);
			if (oia == (struct in_ifaddr *)NULL)
				return (ENOBUFS);
			bzero((caddr_t)oia, sizeof *oia);
			if (ia = in_ifaddr) {
				for ( ; ia->ia_next; ia = ia->ia_next)
					continue;
				ia->ia_next = oia;
			} else
				in_ifaddr = oia;
			ia = oia;
			if (ifa = ifp->if_addrlist) {
				for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
					continue;
				ifa->ifa_next = (struct ifaddr *) ia;
			} else
				ifp->if_addrlist = (struct ifaddr *) ia;
			ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
			ia->ia_ifa.ifa_dstaddr
					= (struct sockaddr *)&ia->ia_dstaddr;
			ia->ia_ifa.ifa_netmask
					= (struct sockaddr *)&ia->ia_sockmask;
			ia->ia_sockmask.sin_len = 8;
			if (ifp->if_flags & IFF_BROADCAST) {
				ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
				ia->ia_broadaddr.sin_family = AF_INET;
			}
			ia->ia_ifp = ifp;
			if (ifp != &loif)
				in_interfaces++;
		}
		break;

	case SIOCSIFBRDADDR:
		if ((so->so_state & SS_PRIV) == 0)
			return (EPERM);
		/* FALLTHROUGH */

	case SIOCGIFADDR:
	case SIOCGIFNETMASK:
	case SIOCGIFDSTADDR:
	case SIOCGIFBRDADDR:
		if (ia == (struct in_ifaddr *)0)
			return (EADDRNOTAVAIL);
		break;
	}
	switch (cmd) {

	case SIOCGIFADDR:
		*((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
		break;

	case SIOCGIFBRDADDR:
		if ((ifp->if_flags & IFF_BROADCAST) == 0)
			return (EINVAL);
		*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
		break;

	case SIOCGIFDSTADDR:
		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
			return (EINVAL);
		*((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
		break;

	case SIOCGIFNETMASK:
		*((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
		break;

	case SIOCSIFDSTADDR:
		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
			return (EINVAL);
		oldaddr = ia->ia_dstaddr;
		ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
		if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
					(ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
			ia->ia_dstaddr = oldaddr;
			return (error);
		}
		if (ia->ia_flags & IFA_ROUTE) {
			ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
			rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
			ia->ia_ifa.ifa_dstaddr =
					(struct sockaddr *)&ia->ia_dstaddr;
			rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
		}
		break;

	case SIOCSIFBRDADDR:
		if ((ifp->if_flags & IFF_BROADCAST) == 0)
			return (EINVAL);
		ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
		break;

	case SIOCSIFADDR:
		return (in_ifinit(ifp, ia,
		    (struct sockaddr_in *) &ifr->ifr_addr, 1));

	case SIOCSIFNETMASK:
		i = ifra->ifra_addr.sin_addr.s_addr;
		ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i);
		break;

	case SIOCAIFADDR:
		maskIsNew = 0;
		hostIsNew = 1;
		error = 0;
		if (ia->ia_addr.sin_family == AF_INET) {
			if (ifra->ifra_addr.sin_len == 0) {
				ifra->ifra_addr = ia->ia_addr;
				hostIsNew = 0;
			} else if (ifra->ifra_addr.sin_addr.s_addr ==
					       ia->ia_addr.sin_addr.s_addr)
				hostIsNew = 0;
		}
		if (ifra->ifra_mask.sin_len) {
			in_ifscrub(ifp, ia);
			ia->ia_sockmask = ifra->ifra_mask;
			ia->ia_subnetmask =
			     ntohl(ia->ia_sockmask.sin_addr.s_addr);
			maskIsNew = 1;
		}
		if ((ifp->if_flags & IFF_POINTOPOINT) &&
		    (ifra->ifra_dstaddr.sin_family == AF_INET)) {
			in_ifscrub(ifp, ia);
			ia->ia_dstaddr = ifra->ifra_dstaddr;
			maskIsNew  = 1; /* We lie; but the effect's the same */
		}
		if (ifra->ifra_addr.sin_family == AF_INET &&
		    (hostIsNew || maskIsNew))
			error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
		if ((ifp->if_flags & IFF_BROADCAST) &&
		    (ifra->ifra_broadaddr.sin_family == AF_INET))
			ia->ia_broadaddr = ifra->ifra_broadaddr;
		return (error);

	case SIOCDIFADDR:
		in_ifscrub(ifp, ia);
		if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
			ifp->if_addrlist = ifa->ifa_next;
		else {
			while (ifa->ifa_next &&
			       (ifa->ifa_next != (struct ifaddr *)ia))
				    ifa = ifa->ifa_next;
			if (ifa->ifa_next)
				ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
			else
				printf("Couldn't unlink inifaddr from ifp\n");
		}
		oia = ia;
		if (oia == (ia = in_ifaddr))
			in_ifaddr = ia->ia_next;
		else {
			while (ia->ia_next && (ia->ia_next != oia))
				ia = ia->ia_next;
			if (ia->ia_next)
				ia->ia_next = oia->ia_next;
			else
				printf("Didn't unlink inifadr from list\n");
		}
		IFAFREE((&oia->ia_ifa));
		break;

	default:
		if (ifp == 0 || ifp->if_ioctl == 0)
			return (EOPNOTSUPP);
		return ((*ifp->if_ioctl)(ifp, cmd, data));
	}
	return (0);
}

/*
 * Delete any existing route for an interface.
 */
in_ifscrub(ifp, ia)
	register struct ifnet *ifp;
	register struct in_ifaddr *ia;
{

	if ((ia->ia_flags & IFA_ROUTE) == 0)
		return;
	if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
		rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
	else
		rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
	ia->ia_flags &= ~IFA_ROUTE;
}

/*
 * Initialize an interface's internet address
 * and routing table entry.
 */
in_ifinit(ifp, ia, sin, scrub)
	register struct ifnet *ifp;
	register struct in_ifaddr *ia;
	struct sockaddr_in *sin;
	int scrub;
{
	register u_long i = ntohl(sin->sin_addr.s_addr);
	struct sockaddr_in oldaddr;
	int s = splimp(), error, flags = RTF_UP;
	int ether_output(), arp_rtrequest();

	oldaddr = ia->ia_addr;
	ia->ia_addr = *sin;
	/*
	 * Give the interface a chance to initialize
	 * if this is its first address,
	 * and to validate the address if necessary.
	 */
	if (ifp->if_ioctl &&
	    (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
		splx(s);
		ia->ia_addr = oldaddr;
		return (error);
	}
	if (ifp->if_output == ether_output) { /* XXX: Another Kludge */
		ia->ia_ifa.ifa_rtrequest = arp_rtrequest;
		ia->ia_ifa.ifa_flags |= RTF_CLONING;
	}
	splx(s);
	if (scrub) {
		ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
		in_ifscrub(ifp, ia);
		ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
	}
	if (IN_CLASSA(i))
		ia->ia_netmask = IN_CLASSA_NET;
	else if (IN_CLASSB(i))
		ia->ia_netmask = IN_CLASSB_NET;
	else
		ia->ia_netmask = IN_CLASSC_NET;
	ia->ia_net = i & ia->ia_netmask;
	/*
	 * The subnet mask includes at least the standard network part,
	 * but may already have been set to a larger value.
	 */
	ia->ia_subnetmask |= ia->ia_netmask;
	ia->ia_subnet = i & ia->ia_subnetmask;
	ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
	{
		register char *cp = (char *) (1 + &(ia->ia_sockmask.sin_addr));
		register char *cpbase = (char *) &(ia->ia_sockmask.sin_addr);
		while (--cp >= cpbase)
			if (*cp) {
				ia->ia_sockmask.sin_len =
					1 + cp - (char *) &(ia->ia_sockmask);
				break;
			}
	}
	/*
	 * Add route for the network.
	 */
	ia->ia_ifa.ifa_metric = ifp->if_metric;
	if (ifp->if_flags & IFF_BROADCAST) {
		ia->ia_broadaddr.sin_addr = 
			in_makeaddr(ia->ia_subnet, INADDR_BROADCAST);
		ia->ia_netbroadcast.s_addr =
		    htonl(ia->ia_net | (INADDR_BROADCAST &~ ia->ia_netmask));
	} else if (ifp->if_flags & IFF_LOOPBACK) {
		ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
		flags |= RTF_HOST;
	} else if (ifp->if_flags & IFF_POINTOPOINT) {
		if (ia->ia_dstaddr.sin_family != AF_INET)
			return (0);
		flags |= RTF_HOST;
	}
	if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0)
		ia->ia_flags |= IFA_ROUTE;
	return (error);
}

/*
 * Return address info for specified internet network.
 */
struct in_ifaddr *
in_iaonnetof(net)
	u_long net;
{
	register struct in_ifaddr *ia;

	for (ia = in_ifaddr; ia; ia = ia->ia_next)
		if (ia->ia_subnet == net)
			return (ia);
	return ((struct in_ifaddr *)0);
}

/*
 * Return 1 if the address might be a local broadcast address.
 */
in_broadcast(in)
	struct in_addr in;
{
	register struct in_ifaddr *ia;
	u_long t;

	/*
	 * Look through the list of addresses for a match
	 * with a broadcast address.
	 */
	for (ia = in_ifaddr; ia; ia = ia->ia_next)
	    if (ia->ia_ifp->if_flags & IFF_BROADCAST) {
		if (ia->ia_broadaddr.sin_addr.s_addr == in.s_addr)
		     return (1);
		/*
		 * Check for old-style (host 0) broadcast.
		 */
		if ((t = ntohl(in.s_addr)) == ia->ia_subnet || t == ia->ia_net)
		    return (1);
	}
	if (in.s_addr == INADDR_BROADCAST || in.s_addr == INADDR_ANY)
		return (1);
	return (0);
}
#endif
Commit	Line	Data
8ae0e4b4	1	/*
6aa944c6	2	* Copyright (c) 1982, 1986, 1991 Regents of the University of California.
2b6b6284	3	* All rights reserved.
8ae0e4b4	4	*
dbf0c423	5	* %sccs.include.redist.c%
2b6b6284	6	*
a6e3920d	7	* @(#)in.c 7.24 (Berkeley) %G%
8ae0e4b4	8	*/
8473bbab	9
20666ad3	10	#include "param.h"
65b95551	11	#include "ioctl.h"
1459f4b8	12	#include "errno.h"
20666ad3	13	#include "mbuf.h"
20666ad3 JB	14	#include "socket.h"
20666ad3 JB	15	#include "socketvar.h"
20666ad3	16	#include "in_systm.h"
6aa944c6 MK	17	#include "net/if.h"
	18	#include "net/route.h"
	19	#include "net/af.h"
65b95551 MK	20	#include "in.h"
65b95551 MK	21	#include "in_var.h"
8473bbab SL	22
8473bbab SL	23	#ifdef INET
8473bbab	24	/*
65b95551	25	* Formulate an Internet address from network + host.
8473bbab SL	26	*/
8473bbab SL	27	struct in_addr
65b95551 MK	28	in_makeaddr(net, host)
65b95551 MK	29	u_long net, host;
8473bbab	30	{
65b95551 MK	31	register struct in_ifaddr *ia;
65b95551 MK	32	register u_long mask;
8473bbab SL	33	u_long addr;
8473bbab SL	34
65b95551 MK	35	if (IN_CLASSA(net))
	36	mask = IN_CLASSA_HOST;
	37	else if (IN_CLASSB(net))
	38	mask = IN_CLASSB_HOST;
8473bbab	39	else
65b95551 MK	40	mask = IN_CLASSC_HOST;
	41	for (ia = in_ifaddr; ia; ia = ia->ia_next)
	42	if ((ia->ia_netmask & net) == ia->ia_net) {
	43	mask = ~ia->ia_subnetmask;
	44	break;
	45	}
	46	addr = htonl(net \| (host & mask));
8473bbab SL	47	return ((struct in_addr )&addr);
	48	}
	49
	50	/*
a8d3bf7f	51	* Return the network number from an internet address.
8473bbab	52	*/
2dd77a90	53	u_long
8473bbab SL	54	in_netof(in)
	55	struct in_addr in;
	56	{
2c48b3f8	57	register u_long i = ntohl(in.s_addr);
65b95551 MK	58	register u_long net;
65b95551 MK	59	register struct in_ifaddr *ia;
8473bbab	60
65b95551 MK	61	if (IN_CLASSA(i))
	62	net = i & IN_CLASSA_NET;
	63	else if (IN_CLASSB(i))
	64	net = i & IN_CLASSB_NET;
b4f9e9c7	65	else if (IN_CLASSC(i))
65b95551	66	net = i & IN_CLASSC_NET;
b4f9e9c7 MK	67	else
b4f9e9c7 MK	68	return (0);
083b2954 MK	69
083b2954 MK	70	/*
65b95551	71	* Check whether network is a subnet;
083b2954 MK	72	* if so, return subnet number.
083b2954 MK	73	*/
65b95551	74	for (ia = in_ifaddr; ia; ia = ia->ia_next)
2dd77a90	75	if (net == ia->ia_net)
65b95551	76	return (i & ia->ia_subnetmask);
083b2954	77	return (net);
8473bbab SL	78	}
8473bbab SL	79
b4dc7708 KS	80	/*
	81	* Compute and save network mask as sockaddr from an internet address.
	82	*/
	83	in_sockmaskof(in, sockmask)
	84	struct in_addr in;
	85	register struct sockaddr_in *sockmask;
	86	{
	87	register u_long net;
	88	register u_long mask;
	89	{
	90	register u_long i = ntohl(in.s_addr);
	91
	92	if (i == 0)
	93	net = 0, mask = 0;
	94	else if (IN_CLASSA(i))
	95	net = i & IN_CLASSA_NET, mask = IN_CLASSA_NET;
	96	else if (IN_CLASSB(i))
	97	net = i & IN_CLASSB_NET, mask = IN_CLASSB_NET;
	98	else if (IN_CLASSC(i))
	99	net = i & IN_CLASSC_NET, mask = IN_CLASSC_NET;
	100	else
	101	net = i, mask = -1;
	102	}
	103	{
	104	register struct in_ifaddr *ia;
	105	/*
	106	* Check whether network is a subnet;
	107	* if so, return subnet number.
	108	*/
	109	for (ia = in_ifaddr; ia; ia = ia->ia_next)
	110	if (net == ia->ia_net)
	111	mask = ia->ia_subnetmask;
	112	}
	113	{
b4dc7708	114	register char cpbase = (char )&(sockmask->sin_addr);
a48489e5	115	register char cp = (char )(1 + &(sockmask->sin_addr));
b4dc7708 KS	116
	117	sockmask->sin_addr.s_addr = htonl(mask);
	118	sockmask->sin_len = 0;
	119	while (--cp >= cpbase)
	120	if (*cp) {
	121	sockmask->sin_len = 1 + cp - (caddr_t)sockmask;
	122	break;
	123	}
	124	}
	125	}
	126
8473bbab	127	/*
a8d3bf7f	128	* Return the host portion of an internet address.
8473bbab	129	*/
8011f5df	130	u_long
8473bbab SL	131	in_lnaof(in)
	132	struct in_addr in;
	133	{
2c48b3f8	134	register u_long i = ntohl(in.s_addr);
65b95551 MK	135	register u_long net, host;
65b95551 MK	136	register struct in_ifaddr *ia;
8473bbab	137
3adde5ac	138	if (IN_CLASSA(i)) {
65b95551 MK	139	net = i & IN_CLASSA_NET;
65b95551 MK	140	host = i & IN_CLASSA_HOST;
3adde5ac	141	} else if (IN_CLASSB(i)) {
65b95551 MK	142	net = i & IN_CLASSB_NET;
65b95551 MK	143	host = i & IN_CLASSB_HOST;
b4f9e9c7	144	} else if (IN_CLASSC(i)) {
65b95551 MK	145	net = i & IN_CLASSC_NET;
65b95551 MK	146	host = i & IN_CLASSC_HOST;
b4f9e9c7 MK	147	} else
b4f9e9c7 MK	148	return (i);
3adde5ac	149
083b2954	150	/*
65b95551	151	* Check whether network is a subnet;
083b2954 MK	152	* if so, use the modified interpretation of `host'.
083b2954 MK	153	*/
65b95551	154	for (ia = in_ifaddr; ia; ia = ia->ia_next)
2dd77a90	155	if (net == ia->ia_net)
65b95551	156	return (host &~ ia->ia_subnetmask);
083b2954	157	return (host);
8473bbab SL	158	}
8473bbab SL	159
8011f5df MK	160	#ifndef SUBNETSARELOCAL
	161	#define SUBNETSARELOCAL 1
	162	#endif
	163	int subnetsarelocal = SUBNETSARELOCAL;
99578149	164	/*
65b95551	165	* Return 1 if an internet address is for a ``local'' host
8011f5df MK	166	* (one to which we have a connection). If subnetsarelocal
	167	* is true, this includes other subnets of the local net.
	168	* Otherwise, it includes only the directly-connected (sub)nets.
99578149 MK	169	*/
	170	in_localaddr(in)
	171	struct in_addr in;
	172	{
	173	register u_long i = ntohl(in.s_addr);
65b95551	174	register struct in_ifaddr *ia;
99578149	175
16cae8d5 MK	176	if (subnetsarelocal) {
	177	for (ia = in_ifaddr; ia; ia = ia->ia_next)
	178	if ((i & ia->ia_netmask) == ia->ia_net)
	179	return (1);
	180	} else {
	181	for (ia = in_ifaddr; ia; ia = ia->ia_next)
	182	if ((i & ia->ia_subnetmask) == ia->ia_subnet)
	183	return (1);
	184	}
65b95551 MK	185	return (0);
	186	}
	187
b4f9e9c7 MK	188	/*
	189	* Determine whether an IP address is in a reserved set of addresses
	190	* that may not be forwarded, or whether datagrams to that destination
	191	* may be forwarded.
	192	*/
	193	in_canforward(in)
	194	struct in_addr in;
	195	{
	196	register u_long i = ntohl(in.s_addr);
	197	register u_long net;
	198
	199	if (IN_EXPERIMENTAL(i))
	200	return (0);
	201	if (IN_CLASSA(i)) {
	202	net = i & IN_CLASSA_NET;
	203	if (net == 0 \|\| net == IN_LOOPBACKNET)
	204	return (0);
	205	}
	206	return (1);
	207	}
	208
2dd77a90 MK	209	int in_interfaces; /* number of external internet interfaces */
	210	extern struct ifnet loif;
	211
65b95551 MK	212	/*
	213	* Generic internet control operations (ioctl's).
	214	* Ifp is 0 if not an interface-specific ioctl.
	215	*/
2dd77a90	216	/* ARGSUSED */
65b95551 MK	217	in_control(so, cmd, data, ifp)
	218	struct socket *so;
	219	int cmd;
	220	caddr_t data;
	221	register struct ifnet *ifp;
	222	{
	223	register struct ifreq ifr = (struct ifreq )data;
	224	register struct in_ifaddr *ia = 0;
b4dc7708 KS	225	register struct ifaddr *ifa;
	226	struct in_ifaddr *oia;
	227	struct in_aliasreq ifra = (struct in_aliasreq )data;
b4dc7708 KS	228	struct sockaddr_in oldaddr;
	229	int error, hostIsNew, maskIsNew;
	230	u_long i;
65b95551 MK	231
	232	/*
	233	* Find address for this interface, if it exists.
	234	*/
	235	if (ifp)
	236	for (ia = in_ifaddr; ia; ia = ia->ia_next)
	237	if (ia->ia_ifp == ifp)
	238	break;
	239
	240	switch (cmd) {
	241
b4dc7708 KS	242	case SIOCAIFADDR:
	243	case SIOCDIFADDR:
	244	if (ifra->ifra_addr.sin_family == AF_INET)
	245	for (oia = ia; ia; ia = ia->ia_next) {
	246	if (ia->ia_ifp == ifp &&
	247	ia->ia_addr.sin_addr.s_addr ==
	248	ifra->ifra_addr.sin_addr.s_addr)
	249	break;
	250	}
	251	if (cmd == SIOCDIFADDR && ia == 0)
	252	return (EADDRNOTAVAIL);
	253	/* FALLTHROUGH */
65b95551	254	case SIOCSIFADDR:
65b95551	255	case SIOCSIFNETMASK:
0977715b	256	case SIOCSIFDSTADDR:
6aa944c6 MK	257	if ((so->so_state & SS_PRIV) == 0)
6aa944c6 MK	258	return (EPERM);
65b95551 MK	259
	260	if (ifp == 0)
	261	panic("in_control");
	262	if (ia == (struct in_ifaddr *)0) {
b965365f KS	263	oia = (struct in_ifaddr *)
	264	malloc(sizeof *oia, M_IFADDR, M_WAITOK);
	265	if (oia == (struct in_ifaddr *)NULL)
65b95551	266	return (ENOBUFS);
b965365f	267	bzero((caddr_t)oia, sizeof *oia);
65b95551 MK	268	if (ia = in_ifaddr) {
65b95551 MK	269	for ( ; ia->ia_next; ia = ia->ia_next)
a6e3920d	270	continue;
b965365f	271	ia->ia_next = oia;
65b95551	272	} else
b965365f KS	273	in_ifaddr = oia;
b965365f KS	274	ia = oia;
65b95551 MK	275	if (ifa = ifp->if_addrlist) {
65b95551 MK	276	for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
a6e3920d	277	continue;
65b95551 MK	278	ifa->ifa_next = (struct ifaddr *) ia;
	279	} else
	280	ifp->if_addrlist = (struct ifaddr *) ia;
b4dc7708 KS	281	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
	282	ia->ia_ifa.ifa_dstaddr
	283	= (struct sockaddr *)&ia->ia_dstaddr;
	284	ia->ia_ifa.ifa_netmask
	285	= (struct sockaddr *)&ia->ia_sockmask;
	286	ia->ia_sockmask.sin_len = 8;
	287	if (ifp->if_flags & IFF_BROADCAST) {
	288	ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
	289	ia->ia_broadaddr.sin_family = AF_INET;
	290	}
65b95551	291	ia->ia_ifp = ifp;
2dd77a90 MK	292	if (ifp != &loif)
2dd77a90 MK	293	in_interfaces++;
99578149	294	}
65b95551	295	break;
b9ce6c7a MK	296
b9ce6c7a MK	297	case SIOCSIFBRDADDR:
6aa944c6 MK	298	if ((so->so_state & SS_PRIV) == 0)
6aa944c6 MK	299	return (EPERM);
b9ce6c7a MK	300	/* FALLTHROUGH */
b9ce6c7a MK	301
a48489e5 KS	302	case SIOCGIFADDR:
	303	case SIOCGIFNETMASK:
	304	case SIOCGIFDSTADDR:
	305	case SIOCGIFBRDADDR:
b9ce6c7a MK	306	if (ia == (struct in_ifaddr *)0)
	307	return (EADDRNOTAVAIL);
	308	break;
65b95551	309	}
65b95551 MK	310	switch (cmd) {
	311
	312	case SIOCGIFADDR:
b4dc7708	313	((struct sockaddr_in )&ifr->ifr_addr) = ia->ia_addr;
65b95551 MK	314	break;
	315
	316	case SIOCGIFBRDADDR:
	317	if ((ifp->if_flags & IFF_BROADCAST) == 0)
	318	return (EINVAL);
b4dc7708	319	((struct sockaddr_in )&ifr->ifr_dstaddr) = ia->ia_broadaddr;
65b95551 MK	320	break;
	321
	322	case SIOCGIFDSTADDR:
	323	if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
	324	return (EINVAL);
b4dc7708	325	((struct sockaddr_in )&ifr->ifr_dstaddr) = ia->ia_dstaddr;
65b95551 MK	326	break;
	327
	328	case SIOCGIFNETMASK:
b4dc7708	329	((struct sockaddr_in )&ifr->ifr_addr) = ia->ia_sockmask;
65b95551 MK	330	break;
	331
	332	case SIOCSIFDSTADDR:
	333	if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
	334	return (EINVAL);
2c83bd95	335	oldaddr = ia->ia_dstaddr;
b4dc7708	336	ia->ia_dstaddr = (struct sockaddr_in )&ifr->ifr_dstaddr;
4138c016 KS	337	if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
4138c016 KS	338	(ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
2c83bd95	339	ia->ia_dstaddr = oldaddr;
65b95551	340	return (error);
2c83bd95 MK	341	}
2c83bd95 MK	342	if (ia->ia_flags & IFA_ROUTE) {
b4dc7708 KS	343	ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
b4dc7708 KS	344	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
7189a987 KS	345	ia->ia_ifa.ifa_dstaddr =
7189a987 KS	346	(struct sockaddr *)&ia->ia_dstaddr;
b4dc7708	347	rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST\|RTF_UP);
2c83bd95	348	}
65b95551 MK	349	break;
	350
	351	case SIOCSIFBRDADDR:
	352	if ((ifp->if_flags & IFF_BROADCAST) == 0)
	353	return (EINVAL);
b4dc7708	354	ia->ia_broadaddr = (struct sockaddr_in )&ifr->ifr_broadaddr;
65b95551 MK	355	break;
	356
	357	case SIOCSIFADDR:
9340d736	358	return (in_ifinit(ifp, ia,
b4dc7708	359	(struct sockaddr_in *) &ifr->ifr_addr, 1));
65b95551 MK	360
65b95551 MK	361	case SIOCSIFNETMASK:
b4dc7708 KS	362	i = ifra->ifra_addr.sin_addr.s_addr;
	363	ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i);
	364	break;
	365
	366	case SIOCAIFADDR:
36a9a6d3 MK	367	maskIsNew = 0;
	368	hostIsNew = 1;
	369	error = 0;
b4dc7708 KS	370	if (ia->ia_addr.sin_family == AF_INET) {
	371	if (ifra->ifra_addr.sin_len == 0) {
	372	ifra->ifra_addr = ia->ia_addr;
	373	hostIsNew = 0;
	374	} else if (ifra->ifra_addr.sin_addr.s_addr ==
	375	ia->ia_addr.sin_addr.s_addr)
	376	hostIsNew = 0;
	377	}
	378	if (ifra->ifra_mask.sin_len) {
	379	in_ifscrub(ifp, ia);
	380	ia->ia_sockmask = ifra->ifra_mask;
	381	ia->ia_subnetmask =
36a9a6d3	382	ntohl(ia->ia_sockmask.sin_addr.s_addr);
b4dc7708 KS	383	maskIsNew = 1;
	384	}
	385	if ((ifp->if_flags & IFF_POINTOPOINT) &&
	386	(ifra->ifra_dstaddr.sin_family == AF_INET)) {
	387	in_ifscrub(ifp, ia);
	388	ia->ia_dstaddr = ifra->ifra_dstaddr;
	389	maskIsNew = 1; /* We lie; but the effect's the same */
	390	}
	391	if (ifra->ifra_addr.sin_family == AF_INET &&
36a9a6d3	392	(hostIsNew \|\| maskIsNew))
b4dc7708 KS	393	error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
	394	if ((ifp->if_flags & IFF_BROADCAST) &&
	395	(ifra->ifra_broadaddr.sin_family == AF_INET))
	396	ia->ia_broadaddr = ifra->ifra_broadaddr;
	397	return (error);
	398
	399	case SIOCDIFADDR:
	400	in_ifscrub(ifp, ia);
	401	if ((ifa = ifp->if_addrlist) == (struct ifaddr *)ia)
	402	ifp->if_addrlist = ifa->ifa_next;
	403	else {
	404	while (ifa->ifa_next &&
	405	(ifa->ifa_next != (struct ifaddr *)ia))
	406	ifa = ifa->ifa_next;
	407	if (ifa->ifa_next)
36a9a6d3	408	ifa->ifa_next = ((struct ifaddr *)ia)->ifa_next;
b4dc7708 KS	409	else
	410	printf("Couldn't unlink inifaddr from ifp\n");
	411	}
	412	oia = ia;
36a9a6d3	413	if (oia == (ia = in_ifaddr))
b4dc7708	414	in_ifaddr = ia->ia_next;
36a9a6d3 MK	415	else {
36a9a6d3 MK	416	while (ia->ia_next && (ia->ia_next != oia))
b4dc7708	417	ia = ia->ia_next;
b4dc7708	418	if (ia->ia_next)
36a9a6d3	419	ia->ia_next = oia->ia_next;
b4dc7708 KS	420	else
	421	printf("Didn't unlink inifadr from list\n");
	422	}
b965365f	423	IFAFREE((&oia->ia_ifa));
65b95551 MK	424	break;
	425
	426	default:
	427	if (ifp == 0 \|\| ifp->if_ioctl == 0)
	428	return (EOPNOTSUPP);
	429	return ((*ifp->if_ioctl)(ifp, cmd, data));
99578149 MK	430	}
	431	return (0);
	432	}
	433
b4dc7708 KS	434	/*
	435	* Delete any existing route for an interface.
	436	*/
	437	in_ifscrub(ifp, ia)
	438	register struct ifnet *ifp;
	439	register struct in_ifaddr *ia;
	440	{
	441
	442	if ((ia->ia_flags & IFA_ROUTE) == 0)
	443	return;
	444	if (ifp->if_flags & (IFF_LOOPBACK\|IFF_POINTOPOINT))
	445	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
	446	else
	447	rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
	448	ia->ia_flags &= ~IFA_ROUTE;
	449	}
	450
8473bbab	451	/*
65b95551 MK	452	* Initialize an interface's internet address
65b95551 MK	453	* and routing table entry.
8473bbab	454	*/
b4dc7708	455	in_ifinit(ifp, ia, sin, scrub)
8473bbab	456	register struct ifnet *ifp;
65b95551 MK	457	register struct in_ifaddr *ia;
65b95551 MK	458	struct sockaddr_in *sin;
db55c43b	459	int scrub;
65b95551 MK	460	{
65b95551 MK	461	register u_long i = ntohl(sin->sin_addr.s_addr);
b4dc7708	462	struct sockaddr_in oldaddr;
7189a987	463	int s = splimp(), error, flags = RTF_UP;
1459f4b8	464	int ether_output(), arp_rtrequest();
65b95551	465
2c83bd95	466	oldaddr = ia->ia_addr;
b4dc7708	467	ia->ia_addr = *sin;
b9ce6c7a MK	468	/*
	469	* Give the interface a chance to initialize
	470	* if this is its first address,
	471	* and to validate the address if necessary.
	472	*/
db55c43b CT	473	if (ifp->if_ioctl &&
db55c43b CT	474	(error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
b9ce6c7a	475	splx(s);
2c83bd95	476	ia->ia_addr = oldaddr;
b9ce6c7a MK	477	return (error);
b9ce6c7a MK	478	}
1459f4b8 KS	479	if (ifp->if_output == ether_output) { /* XXX: Another Kludge */
	480	ia->ia_ifa.ifa_rtrequest = arp_rtrequest;
	481	ia->ia_ifa.ifa_flags \|= RTF_CLONING;
	482	}
7189a987	483	splx(s);
b4dc7708 KS	484	if (scrub) {
	485	ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
	486	in_ifscrub(ifp, ia);
	487	ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
65b95551	488	}
65b95551 MK	489	if (IN_CLASSA(i))
	490	ia->ia_netmask = IN_CLASSA_NET;
	491	else if (IN_CLASSB(i))
	492	ia->ia_netmask = IN_CLASSB_NET;
	493	else
	494	ia->ia_netmask = IN_CLASSC_NET;
	495	ia->ia_net = i & ia->ia_netmask;
	496	/*
	497	* The subnet mask includes at least the standard network part,
	498	* but may already have been set to a larger value.
	499	*/
	500	ia->ia_subnetmask \|= ia->ia_netmask;
	501	ia->ia_subnet = i & ia->ia_subnetmask;
b4dc7708	502	ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
a48489e5 KS	503	{
	504	register char cp = (char ) (1 + &(ia->ia_sockmask.sin_addr));
	505	register char cpbase = (char ) &(ia->ia_sockmask.sin_addr);
	506	while (--cp >= cpbase)
	507	if (*cp) {
	508	ia->ia_sockmask.sin_len =
	509	1 + cp - (char *) &(ia->ia_sockmask);
	510	break;
	511	}
	512	}
7189a987 KS	513	/*
	514	* Add route for the network.
	515	*/
8965e0de	516	ia->ia_ifa.ifa_metric = ifp->if_metric;
65b95551	517	if (ifp->if_flags & IFF_BROADCAST) {
b4dc7708	518	ia->ia_broadaddr.sin_addr =
65b95551	519	in_makeaddr(ia->ia_subnet, INADDR_BROADCAST);
4afb57fa MK	520	ia->ia_netbroadcast.s_addr =
4afb57fa MK	521	htonl(ia->ia_net \| (INADDR_BROADCAST &~ ia->ia_netmask));
7189a987	522	} else if (ifp->if_flags & IFF_LOOPBACK) {
b4dc7708	523	ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
7189a987 KS	524	flags \|= RTF_HOST;
	525	} else if (ifp->if_flags & IFF_POINTOPOINT) {
	526	if (ia->ia_dstaddr.sin_family != AF_INET)
	527	return (0);
	528	flags \|= RTF_HOST;
2c83bd95	529	}
7189a987 KS	530	if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0)
	531	ia->ia_flags \|= IFA_ROUTE;
	532	return (error);
65b95551 MK	533	}
	534
	535	/*
	536	* Return address info for specified internet network.
	537	*/
	538	struct in_ifaddr *
	539	in_iaonnetof(net)
	540	u_long net;
	541	{
	542	register struct in_ifaddr *ia;
	543
	544	for (ia = in_ifaddr; ia; ia = ia->ia_next)
	545	if (ia->ia_subnet == net)
	546	return (ia);
	547	return ((struct in_ifaddr *)0);
	548	}
	549
	550	/*
d6c52d1d	551	* Return 1 if the address might be a local broadcast address.
65b95551 MK	552	*/
	553	in_broadcast(in)
	554	struct in_addr in;
8473bbab	555	{
65b95551	556	register struct in_ifaddr *ia;
d6c52d1d	557	u_long t;
65b95551 MK	558
	559	/*
	560	* Look through the list of addresses for a match
	561	* with a broadcast address.
	562	*/
	563	for (ia = in_ifaddr; ia; ia = ia->ia_next)
d6c52d1d	564	if (ia->ia_ifp->if_flags & IFF_BROADCAST) {
b4dc7708	565	if (ia->ia_broadaddr.sin_addr.s_addr == in.s_addr)
65b95551	566	return (1);
d6c52d1d MK	567	/*
	568	* Check for old-style (host 0) broadcast.
	569	*/
	570	if ((t = ntohl(in.s_addr)) == ia->ia_subnet \|\| t == ia->ia_net)
	571	return (1);
	572	}
	573	if (in.s_addr == INADDR_BROADCAST \|\| in.s_addr == INADDR_ANY)
	574	return (1);
65b95551	575	return (0);
8473bbab SL	576	}
8473bbab SL	577	#endif