X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/6f11712272d2fd48439fdf661911d0ec51591d6a..c59af027e112b534ee7b9ff495682274cc16e205:/usr/src/sys/netinet/in.c

diff --git a/usr/src/sys/netinet/in.c b/usr/src/sys/netinet/in.c
index e947bc7b3e..05f83a7a4b 100644
--- a/usr/src/sys/netinet/in.c
+++ b/usr/src/sys/netinet/in.c
@@ -1,101 +1,577 @@
-/*	in.c	4.12	83/03/14	*/
-
-#include "../h/param.h"
-#include "../h/mbuf.h"
-#include "../h/protosw.h"
-#include "../h/socket.h"
-#include "../h/socketvar.h"
-#include "../netinet/in.h"
-#include "../netinet/in_systm.h"
-#include "../net/if.h"
-#include "../net/route.h"
-#include "../net/af.h"
-
-#ifdef INET
-inet_hash(sin, hp)
-	register struct sockaddr_in *sin;
-	struct afhash *hp;
-{
-
-	hp->afh_nethash = in_netof(sin->sin_addr);
-	hp->afh_hosthash = ntohl(sin->sin_addr.s_addr);
-}
-
-inet_netmatch(sin1, sin2)
-	struct sockaddr_in *sin1, *sin2;
-{
+/*
+ * Copyright (c) 1982, 1986, 1991 Regents of the University of California.
+ * All rights reserved.
+ *
+ * %sccs.include.redist.c%
+ *
+ *	@(#)in.c	7.18 (Berkeley) %G%
+ */
 
-	return (in_netof(sin1->sin_addr) == in_netof(sin2->sin_addr));
-}
+#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.  Used in
- * building addresses stored in the ifnet structure.
+ * Formulate an Internet address from network + host.
  */
 struct in_addr
-if_makeaddr(net, host)
-	int net, host;
+in_makeaddr(net, host)
+	u_long net, host;
 {
+	register struct in_ifaddr *ia;
+	register u_long mask;
 	u_long addr;
 
-	if (net < 128)
-		addr = (net << IN_CLASSA_NSHIFT) | host;
-	else if (net < 65536)
-		addr = (net << IN_CLASSB_NSHIFT) | host;
+	if (IN_CLASSA(net))
+		mask = IN_CLASSA_HOST;
+	else if (IN_CLASSB(net))
+		mask = IN_CLASSB_HOST;
 	else
-		addr = (net << IN_CLASSC_NSHIFT) | host;
-	addr = htonl(addr);
+		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))
-		return (((i)&IN_CLASSA_NET) >> IN_CLASSA_NSHIFT);
+		net = i & IN_CLASSA_NET;
 	else if (IN_CLASSB(i))
-		return (((i)&IN_CLASSB_NET) >> IN_CLASSB_NSHIFT);
+		net = i & IN_CLASSB_NET;
+	else if (IN_CLASSC(i))
+		net = i & IN_CLASSC_NET;
 	else
-		return (((i)&IN_CLASSC_NET) >> IN_CLASSC_NSHIFT);
+		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 mbuf *m;
+	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) {
+			m = m_getclr(M_WAIT, MT_IFADDR);
+			if (m == (struct mbuf *)NULL)
+				return (ENOBUFS);
+			if (ia = in_ifaddr) {
+				for ( ; ia->ia_next; ia = ia->ia_next)
+					;
+				ia->ia_next = mtod(m, struct in_ifaddr *);
+			} else
+				in_ifaddr = mtod(m, struct in_ifaddr *);
+			ia = mtod(m, struct in_ifaddr *);
+			if (ifa = ifp->if_addrlist) {
+				for ( ; ifa->ifa_next; ifa = ifa->ifa_next)
+					;
+				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;
+
+	default:
+		return (EOPNOTSUPP);
+		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, 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");
+		}
+		(void) m_free(dtom(oia));
+		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;
+{
+	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, 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))
-		return ((i)&IN_CLASSA_HOST);
+		ia->ia_netmask = IN_CLASSA_NET;
 	else if (IN_CLASSB(i))
-		return ((i)&IN_CLASSB_HOST);
+		ia->ia_netmask = IN_CLASSB_NET;
 	else
-		return ((i)&IN_CLASSC_HOST);
+		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.
+	 */
+	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);
 }
 
 /*
- * Initialize an interface's routing
- * table entry according to the network.
- * INTERNET SPECIFIC.
+ * Return address info for specified internet network.
  */
-if_rtinit(ifp, flags)
-	register struct ifnet *ifp;
-	int flags;
+struct in_ifaddr *
+in_iaonnetof(net)
+	u_long net;
 {
-	struct sockaddr_in sin;
+	register struct in_ifaddr *ia;
 
-	if (ifp->if_flags & IFF_ROUTE)
-		return;
-	bzero((caddr_t)&sin, sizeof (sin));
-	sin.sin_family = AF_INET;
-	sin.sin_addr = if_makeaddr(ifp->if_net, INADDR_ANY);
-	rtinit((struct sockaddr *)&sin, &ifp->if_addr, flags);
+	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