1995-02-26 12:18:08 +00:00
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/*
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* sys-bsd.c - System-dependent procedures for setting up
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* PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
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*
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* Copyright (c) 1989 Carnegie Mellon University.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by Carnegie Mellon University. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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1995-05-30 03:57:47 +00:00
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*
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1998-01-11 04:02:57 +00:00
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* $Id: arp.c,v 1.20 1997/12/24 09:28:49 brian Exp $
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1995-05-30 03:57:47 +00:00
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*
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1995-02-26 12:18:08 +00:00
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*/
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/*
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* TODO:
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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1997-10-26 01:04:02 +00:00
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#include <sys/socket.h>
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1995-02-26 12:18:08 +00:00
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#include <net/if.h>
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#include <net/route.h>
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#include <net/if_dl.h>
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#include <netinet/in.h>
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#include <net/if_types.h>
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#include <netinet/if_ether.h>
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1997-10-26 01:04:02 +00:00
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/uio.h>
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#include <unistd.h>
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1997-11-22 03:37:54 +00:00
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#include "command.h"
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1997-10-26 01:04:02 +00:00
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#include "mbuf.h"
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1997-09-10 02:20:35 +00:00
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#include "log.h"
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1997-11-09 06:22:49 +00:00
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#include "id.h"
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1997-10-26 01:04:02 +00:00
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#include "arp.h"
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1995-02-26 12:18:08 +00:00
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static int rtm_seq;
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1997-06-09 03:27:43 +00:00
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static int get_ether_addr(int, u_long, struct sockaddr_dl *);
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1996-01-11 17:48:59 +00:00
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1995-02-26 12:18:08 +00:00
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/*
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* SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
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* if it exists.
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*/
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#define SET_SA_FAMILY(addr, family) \
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1997-10-26 01:04:02 +00:00
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memset((char *) &(addr), '\0', sizeof(addr)); \
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1995-02-26 12:18:08 +00:00
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addr.sa_family = (family); \
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addr.sa_len = sizeof(addr);
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#if RTM_VERSION >= 3
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/*
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* sifproxyarp - Make a proxy ARP entry for the peer.
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*/
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static struct {
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1997-08-25 00:29:32 +00:00
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struct rt_msghdr hdr;
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struct sockaddr_inarp dst;
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struct sockaddr_dl hwa;
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char extra[128];
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1997-10-26 01:04:02 +00:00
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} arpmsg;
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1995-02-26 12:18:08 +00:00
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static int arpmsg_valid;
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int
|
1997-08-25 00:29:32 +00:00
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sifproxyarp(int unit, u_long hisaddr)
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1995-02-26 12:18:08 +00:00
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{
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1997-08-25 00:29:32 +00:00
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int routes;
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/*
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* Get the hardware address of an interface on the same subnet as our local
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* address.
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*/
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1997-12-24 09:29:17 +00:00
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memset(&arpmsg, 0, sizeof arpmsg);
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1997-08-25 00:29:32 +00:00
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if (!get_ether_addr(unit, hisaddr, &arpmsg.hwa)) {
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1997-08-31 22:59:49 +00:00
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LogPrintf(LogERROR, "Cannot determine ethernet address for proxy ARP\n");
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1997-08-25 00:29:32 +00:00
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return 0;
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}
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1997-11-09 06:22:49 +00:00
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routes = ID0socket(PF_ROUTE, SOCK_RAW, AF_INET);
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if (routes < 0) {
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1997-08-25 00:29:32 +00:00
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LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
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strerror(errno));
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return 0;
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}
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arpmsg.hdr.rtm_type = RTM_ADD;
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arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
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arpmsg.hdr.rtm_version = RTM_VERSION;
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arpmsg.hdr.rtm_seq = ++rtm_seq;
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arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
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arpmsg.hdr.rtm_inits = RTV_EXPIRE;
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arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
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arpmsg.dst.sin_family = AF_INET;
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arpmsg.dst.sin_addr.s_addr = hisaddr;
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arpmsg.dst.sin_other = SIN_PROXY;
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arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
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+ arpmsg.hwa.sdl_len;
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if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
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LogPrintf(LogERROR, "Add proxy arp entry: %s\n", strerror(errno));
|
1995-02-26 12:18:08 +00:00
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|
close(routes);
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1997-08-25 00:29:32 +00:00
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|
return 0;
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}
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close(routes);
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arpmsg_valid = 1;
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return 1;
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1995-02-26 12:18:08 +00:00
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}
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/*
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* cifproxyarp - Delete the proxy ARP entry for the peer.
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*/
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int
|
1997-08-25 00:29:32 +00:00
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cifproxyarp(int unit, u_long hisaddr)
|
1995-02-26 12:18:08 +00:00
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{
|
1997-08-25 00:29:32 +00:00
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int routes;
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1995-02-26 12:18:08 +00:00
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1997-08-25 00:29:32 +00:00
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if (!arpmsg_valid)
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return 0;
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arpmsg_valid = 0;
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1995-02-26 12:18:08 +00:00
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1997-08-25 00:29:32 +00:00
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arpmsg.hdr.rtm_type = RTM_DELETE;
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arpmsg.hdr.rtm_seq = ++rtm_seq;
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1995-02-26 12:18:08 +00:00
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1997-11-09 06:22:49 +00:00
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routes = ID0socket(PF_ROUTE, SOCK_RAW, AF_INET);
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if (routes < 0) {
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1997-08-25 00:29:32 +00:00
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LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
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strerror(errno));
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return 0;
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}
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if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
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LogPrintf(LogERROR, "Delete proxy arp entry: %s\n", strerror(errno));
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1995-02-26 12:18:08 +00:00
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close(routes);
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1997-08-25 00:29:32 +00:00
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return 0;
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}
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close(routes);
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return 1;
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1995-02-26 12:18:08 +00:00
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}
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1997-08-25 00:29:32 +00:00
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#else /* RTM_VERSION */
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1995-02-26 12:18:08 +00:00
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/*
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* sifproxyarp - Make a proxy ARP entry for the peer.
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*/
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int
|
1997-08-25 00:29:32 +00:00
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sifproxyarp(int unit, u_long hisaddr)
|
1995-02-26 12:18:08 +00:00
|
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{
|
1997-08-25 00:29:32 +00:00
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|
struct arpreq arpreq;
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struct {
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struct sockaddr_dl sdl;
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char space[128];
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|
} dls;
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|
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|
1997-12-24 09:29:17 +00:00
|
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memset(&arpreq, '\0', sizeof arpreq);
|
1997-08-25 00:29:32 +00:00
|
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/*
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|
|
* Get the hardware address of an interface on the same subnet as our local
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* address.
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|
|
*/
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if (!get_ether_addr(unit, hisaddr, &dls.sdl)) {
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|
LogPrintf(LOG_PHASE_BIT, "Cannot determine ethernet address for proxy ARP\n");
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|
return 0;
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|
}
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|
|
arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
|
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|
|
arpreq.arp_ha.sa_family = AF_UNSPEC;
|
1997-10-26 01:04:02 +00:00
|
|
|
memcpy(arpreq.arp_ha.sa_data, LLADDR(&dls.sdl), dls.sdl.sdl_alen);
|
1997-08-25 00:29:32 +00:00
|
|
|
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
|
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|
|
((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
|
|
|
|
arpreq.arp_flags = ATF_PERM | ATF_PUBL;
|
1997-11-09 06:22:49 +00:00
|
|
|
if (ID0ioctl(unit, SIOCSARP, (caddr_t) & arpreq) < 0) {
|
1997-08-31 22:59:49 +00:00
|
|
|
LogPrintf(LogERROR, "sifproxyarp: ioctl(SIOCSARP): %s\n", strerror(errno));
|
1997-08-25 00:29:32 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return 1;
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* cifproxyarp - Delete the proxy ARP entry for the peer.
|
|
|
|
*/
|
|
|
|
int
|
1997-08-25 00:29:32 +00:00
|
|
|
cifproxyarp(int unit, u_long hisaddr)
|
1995-02-26 12:18:08 +00:00
|
|
|
{
|
1997-08-25 00:29:32 +00:00
|
|
|
struct arpreq arpreq;
|
|
|
|
|
1997-12-24 09:29:17 +00:00
|
|
|
memset(&arpreq, '\0', sizeof arpreq);
|
1997-08-25 00:29:32 +00:00
|
|
|
SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
|
|
|
|
((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
|
1997-11-09 06:22:49 +00:00
|
|
|
if (ID0ioctl(unit, SIOCDARP, (caddr_t) & arpreq) < 0) {
|
1997-08-31 22:59:49 +00:00
|
|
|
LogPrintf(LogERROR, "cifproxyarp: ioctl(SIOCDARP): %s\n", strerror(errno));
|
1997-08-25 00:29:32 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return 1;
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|
1997-08-25 00:29:32 +00:00
|
|
|
|
|
|
|
#endif /* RTM_VERSION */
|
1995-02-26 12:18:08 +00:00
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
* get_ether_addr - get the hardware address of an interface on the
|
|
|
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* the same subnet as ipaddr.
|
|
|
|
*/
|
|
|
|
#define MAX_IFS 32
|
|
|
|
|
1997-10-26 01:04:02 +00:00
|
|
|
static int
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|
|
|
get_ether_addr(int s, u_long ipaddr, struct sockaddr_dl *hwaddr)
|
1995-02-26 12:18:08 +00:00
|
|
|
{
|
1997-08-25 00:29:32 +00:00
|
|
|
struct ifreq *ifr, *ifend, *ifp;
|
|
|
|
u_long ina, mask;
|
|
|
|
struct sockaddr_dl *dla;
|
|
|
|
struct ifreq ifreq;
|
|
|
|
struct ifconf ifc;
|
|
|
|
struct ifreq ifs[MAX_IFS];
|
|
|
|
|
1997-12-24 09:29:17 +00:00
|
|
|
ifc.ifc_len = sizeof ifs;
|
1997-08-25 00:29:32 +00:00
|
|
|
ifc.ifc_req = ifs;
|
|
|
|
if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
|
1997-08-31 22:59:49 +00:00
|
|
|
LogPrintf(LogERROR, "get_ether_addr: ioctl(SIOCGIFCONF): %s\n",
|
|
|
|
strerror(errno));
|
1997-08-25 00:29:32 +00:00
|
|
|
return 0;
|
|
|
|
}
|
1995-02-26 12:18:08 +00:00
|
|
|
|
1997-08-25 00:29:32 +00:00
|
|
|
/*
|
|
|
|
* Scan through looking for an interface with an Internet address on the
|
|
|
|
* same subnet as `ipaddr'.
|
|
|
|
*/
|
|
|
|
ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
|
|
|
|
for (ifr = ifc.ifc_req; ifr < ifend;) {
|
|
|
|
if (ifr->ifr_addr.sa_family == AF_INET) {
|
|
|
|
ina = ((struct sockaddr_in *) & ifr->ifr_addr)->sin_addr.s_addr;
|
1997-12-24 09:29:17 +00:00
|
|
|
strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof ifreq.ifr_name - 1);
|
|
|
|
ifreq.ifr_name[sizeof ifreq.ifr_name - 1] = '\0';
|
1997-08-25 00:29:32 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Check that the interface is up, and not point-to-point or loopback.
|
|
|
|
*/
|
|
|
|
if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
|
|
|
|
continue;
|
|
|
|
if ((ifreq.ifr_flags &
|
|
|
|
(IFF_UP | IFF_BROADCAST | IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP))
|
|
|
|
!= (IFF_UP | IFF_BROADCAST))
|
|
|
|
goto nextif;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Get its netmask and check that it's on the right subnet.
|
|
|
|
*/
|
|
|
|
if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
|
|
|
|
continue;
|
|
|
|
mask = ((struct sockaddr_in *) & ifreq.ifr_addr)->sin_addr.s_addr;
|
|
|
|
if ((ipaddr & mask) != (ina & mask))
|
|
|
|
goto nextif;
|
|
|
|
|
|
|
|
break;
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|
1997-08-25 00:29:32 +00:00
|
|
|
nextif:
|
|
|
|
ifr = (struct ifreq *) ((char *) &ifr->ifr_addr + ifr->ifr_addr.sa_len);
|
|
|
|
}
|
1995-02-26 12:18:08 +00:00
|
|
|
|
1997-08-25 00:29:32 +00:00
|
|
|
if (ifr >= ifend)
|
|
|
|
return 0;
|
|
|
|
LogPrintf(LogPHASE, "Found interface %s for proxy arp\n", ifr->ifr_name);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now scan through again looking for a link-level address for this
|
|
|
|
* interface.
|
|
|
|
*/
|
|
|
|
ifp = ifr;
|
|
|
|
for (ifr = ifc.ifc_req; ifr < ifend;) {
|
|
|
|
if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
|
|
|
|
&& ifr->ifr_addr.sa_family == AF_LINK) {
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Found the link-level address - copy it out
|
|
|
|
*/
|
|
|
|
dla = (struct sockaddr_dl *) & ifr->ifr_addr;
|
1997-10-26 01:04:02 +00:00
|
|
|
memcpy(hwaddr, dla, dla->sdl_len);
|
1997-08-25 00:29:32 +00:00
|
|
|
return 1;
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|
1997-08-25 00:29:32 +00:00
|
|
|
ifr = (struct ifreq *) ((char *) &ifr->ifr_addr + ifr->ifr_addr.sa_len);
|
|
|
|
}
|
1995-02-26 12:18:08 +00:00
|
|
|
|
1997-08-25 00:29:32 +00:00
|
|
|
return 0;
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef DEBUG
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1997-10-26 01:04:02 +00:00
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int
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1995-02-26 12:18:08 +00:00
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main()
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{
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1997-08-25 00:29:32 +00:00
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u_long ipaddr;
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int s;
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1995-02-26 12:18:08 +00:00
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1997-08-25 00:29:32 +00:00
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s = socket(AF_INET, SOCK_DGRAM, 0);
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ipaddr = inet_addr("192.168.1.32");
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sifproxyarp(s, ipaddr);
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close(s);
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1995-02-26 12:18:08 +00:00
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}
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#endif
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