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.
|
1995-05-30 03:57:47 +00:00
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*
|
1998-06-16 19:40:42 +00:00
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* $Id: arp.c,v 1.28 1998/05/21 21:43:51 brian Exp $
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1995-05-30 03:57:47 +00:00
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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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1998-04-07 00:54:26 +00:00
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#include <sys/types.h>
|
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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|
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#include <net/if_dl.h>
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|
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#include <netinet/in.h>
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|
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#include <netinet/if_ether.h>
|
1998-01-23 21:37:27 +00:00
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|
#include <arpa/inet.h>
|
1998-03-16 22:54:35 +00:00
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|
#include <netinet/in_systm.h>
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|
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#include <netinet/ip.h>
|
1998-04-28 01:25:46 +00:00
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#include <sys/un.h>
|
1997-10-26 01:04:02 +00:00
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#include <stdio.h>
|
1998-01-19 02:59:34 +00:00
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|
#include <stdlib.h>
|
1997-10-26 01:04:02 +00:00
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|
#include <string.h>
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|
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#include <sys/errno.h>
|
1998-01-19 02:59:34 +00:00
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|
#include <sys/sysctl.h>
|
1997-10-26 01:04:02 +00:00
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|
#include <unistd.h>
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#include "mbuf.h"
|
1997-09-10 02:20:35 +00:00
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#include "log.h"
|
1997-11-09 06:22:49 +00:00
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#include "id.h"
|
1998-02-07 20:50:08 +00:00
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#include "timer.h"
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|
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#include "fsm.h"
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#include "defs.h"
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#include "iplist.h"
|
1998-03-13 21:07:46 +00:00
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|
#include "throughput.h"
|
1998-03-16 22:54:35 +00:00
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|
#include "slcompress.h"
|
1998-03-13 21:07:46 +00:00
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|
#include "ipcp.h"
|
1998-03-16 22:52:54 +00:00
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|
#include "filter.h"
|
1998-03-20 19:48:28 +00:00
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|
#include "descriptor.h"
|
1998-04-03 19:21:56 +00:00
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|
#include "lqr.h"
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|
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#include "hdlc.h"
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|
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#include "lcp.h"
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|
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#include "ccp.h"
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|
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#include "link.h"
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|
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#include "mp.h"
|
1998-03-13 21:07:46 +00:00
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#include "bundle.h"
|
1997-10-26 01:04:02 +00:00
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#include "arp.h"
|
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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|
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#define SET_SA_FAMILY(addr, family) \
|
1997-10-26 01:04:02 +00:00
|
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|
memset((char *) &(addr), '\0', sizeof(addr)); \
|
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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/*
|
1998-05-01 19:26:12 +00:00
|
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|
* arp_SetProxy - Make a proxy ARP entry for the peer.
|
1995-02-26 12:18:08 +00:00
|
|
|
*/
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|
|
static struct {
|
1997-08-25 00:29:32 +00:00
|
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|
struct rt_msghdr hdr;
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|
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struct sockaddr_inarp dst;
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|
|
struct sockaddr_dl hwa;
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|
|
char extra[128];
|
1997-10-26 01:04:02 +00:00
|
|
|
} arpmsg;
|
1995-02-26 12:18:08 +00:00
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|
|
static int arpmsg_valid;
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int
|
1998-05-01 19:26:12 +00:00
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|
arp_SetProxy(struct bundle *bundle, struct in_addr addr, int s)
|
1995-02-26 12:18:08 +00:00
|
|
|
{
|
1997-08-25 00:29:32 +00:00
|
|
|
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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|
*/
|
1997-12-24 09:29:17 +00:00
|
|
|
memset(&arpmsg, 0, sizeof arpmsg);
|
1998-02-21 01:45:26 +00:00
|
|
|
if (!get_ether_addr(s, addr, &arpmsg.hwa)) {
|
1998-06-16 19:40:42 +00:00
|
|
|
log_Printf(LogWARN, "Cannot determine ethernet address for proxy ARP\n");
|
1997-08-25 00:29:32 +00:00
|
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|
return 0;
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|
|
|
}
|
1997-11-09 06:22:49 +00:00
|
|
|
routes = ID0socket(PF_ROUTE, SOCK_RAW, AF_INET);
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|
|
|
if (routes < 0) {
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LogERROR, "arp_SetProxy: opening routing socket: %s\n",
|
1997-08-25 00:29:32 +00:00
|
|
|
strerror(errno));
|
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|
|
return 0;
|
|
|
|
}
|
|
|
|
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;
|
1998-02-02 19:33:02 +00:00
|
|
|
arpmsg.hdr.rtm_seq = ++bundle->routing_seq;
|
1997-08-25 00:29:32 +00:00
|
|
|
arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
|
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|
|
arpmsg.hdr.rtm_inits = RTV_EXPIRE;
|
|
|
|
arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
|
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|
|
arpmsg.dst.sin_family = AF_INET;
|
1998-02-21 01:45:26 +00:00
|
|
|
arpmsg.dst.sin_addr.s_addr = addr.s_addr;
|
1997-08-25 00:29:32 +00:00
|
|
|
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) {
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LogERROR, "Add proxy arp entry: %s\n", strerror(errno));
|
1995-02-26 12:18:08 +00:00
|
|
|
close(routes);
|
1997-08-25 00:29:32 +00:00
|
|
|
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;
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
1998-05-01 19:26:12 +00:00
|
|
|
* arp_ClearProxy - Delete the proxy ARP entry for the peer.
|
1995-02-26 12:18:08 +00:00
|
|
|
*/
|
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int
|
1998-05-01 19:26:12 +00:00
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|
arp_ClearProxy(struct bundle *bundle, struct in_addr addr, int s)
|
1995-02-26 12:18:08 +00:00
|
|
|
{
|
1997-08-25 00:29:32 +00:00
|
|
|
int routes;
|
1995-02-26 12:18:08 +00:00
|
|
|
|
1997-08-25 00:29:32 +00:00
|
|
|
if (!arpmsg_valid)
|
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|
return 0;
|
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|
|
arpmsg_valid = 0;
|
1995-02-26 12:18:08 +00:00
|
|
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|
1997-08-25 00:29:32 +00:00
|
|
|
arpmsg.hdr.rtm_type = RTM_DELETE;
|
1998-02-02 19:33:02 +00:00
|
|
|
arpmsg.hdr.rtm_seq = ++bundle->routing_seq;
|
1995-02-26 12:18:08 +00:00
|
|
|
|
1997-11-09 06:22:49 +00:00
|
|
|
routes = ID0socket(PF_ROUTE, SOCK_RAW, AF_INET);
|
|
|
|
if (routes < 0) {
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LogERROR, "arp_SetProxy: opening routing socket: %s\n",
|
1997-08-25 00:29:32 +00:00
|
|
|
strerror(errno));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LogERROR, "Delete proxy arp entry: %s\n", strerror(errno));
|
1995-02-26 12:18:08 +00:00
|
|
|
close(routes);
|
1997-08-25 00:29:32 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
close(routes);
|
|
|
|
return 1;
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|
|
|
|
|
1997-08-25 00:29:32 +00:00
|
|
|
#else /* RTM_VERSION */
|
1995-02-26 12:18:08 +00:00
|
|
|
|
|
|
|
/*
|
1998-05-01 19:26:12 +00:00
|
|
|
* arp_SetProxy - Make a proxy ARP entry for the peer.
|
1995-02-26 12:18:08 +00:00
|
|
|
*/
|
|
|
|
int
|
1998-05-01 19:26:12 +00:00
|
|
|
arp_SetProxy(struct bundle *bundle, struct in_addr addr, int s)
|
1995-02-26 12:18:08 +00:00
|
|
|
{
|
1997-08-25 00:29:32 +00:00
|
|
|
struct arpreq arpreq;
|
|
|
|
struct {
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|
|
|
struct sockaddr_dl sdl;
|
|
|
|
char space[128];
|
|
|
|
} dls;
|
|
|
|
|
1997-12-24 09:29:17 +00:00
|
|
|
memset(&arpreq, '\0', sizeof arpreq);
|
1997-08-25 00:29:32 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Get the hardware address of an interface on the same subnet as our local
|
|
|
|
* address.
|
|
|
|
*/
|
1998-02-21 01:45:26 +00:00
|
|
|
if (!get_ether_addr(s, addr, &dls.sdl)) {
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LOG_PHASE_BIT, "Cannot determine ethernet address for proxy ARP\n");
|
1997-08-25 00:29:32 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
|
|
|
|
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);
|
1998-02-21 01:45:26 +00:00
|
|
|
((struct sockaddr_in *)&arpreq.arp_pa)->sin_addr.s_addr = addr.s_addr;
|
1997-08-25 00:29:32 +00:00
|
|
|
arpreq.arp_flags = ATF_PERM | ATF_PUBL;
|
1998-02-02 19:33:02 +00:00
|
|
|
if (ID0ioctl(s, SIOCSARP, (caddr_t) & arpreq) < 0) {
|
1998-06-16 19:40:42 +00:00
|
|
|
log_Printf(LogERROR, "arp_SetProxy: 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
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
1998-05-01 19:26:12 +00:00
|
|
|
* arp_ClearProxy - Delete the proxy ARP entry for the peer.
|
1995-02-26 12:18:08 +00:00
|
|
|
*/
|
|
|
|
int
|
1998-05-01 19:26:12 +00:00
|
|
|
arp_ClearProxy(struct bundle *bundle, struct in_addr addr, int s)
|
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);
|
1998-02-21 01:45:26 +00:00
|
|
|
((struct sockaddr_in *)&arpreq.arp_pa)->sin_addr.s_addr = addr.s_addr;
|
1998-02-02 19:33:02 +00:00
|
|
|
if (ID0ioctl(s, SIOCDARP, (caddr_t) & arpreq) < 0) {
|
1998-06-16 19:40:42 +00:00
|
|
|
log_Printf(LogERROR, "arp_ClearProxy: 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
|
|
|
|
* the same subnet as ipaddr.
|
|
|
|
*/
|
|
|
|
|
1998-04-23 23:50:40 +00:00
|
|
|
int
|
1998-01-19 02:59:34 +00:00
|
|
|
get_ether_addr(int s, struct in_addr ipaddr, struct sockaddr_dl *hwaddr)
|
1995-02-26 12:18:08 +00:00
|
|
|
{
|
1998-01-23 21:37:27 +00:00
|
|
|
int mib[6], sa_len, skip, b;
|
1998-01-19 02:59:34 +00:00
|
|
|
size_t needed;
|
1998-01-23 21:37:27 +00:00
|
|
|
char *buf, *ptr, *end;
|
|
|
|
struct if_msghdr *ifm;
|
|
|
|
struct ifa_msghdr *ifam;
|
|
|
|
struct sockaddr *sa;
|
|
|
|
struct sockaddr_dl *dl;
|
|
|
|
struct sockaddr_in *ifa, *mask;
|
1998-01-19 02:59:34 +00:00
|
|
|
|
|
|
|
mib[0] = CTL_NET;
|
|
|
|
mib[1] = PF_ROUTE;
|
|
|
|
mib[2] = 0;
|
|
|
|
mib[3] = 0;
|
1998-01-23 21:37:27 +00:00
|
|
|
mib[4] = NET_RT_IFLIST;
|
1998-01-19 02:59:34 +00:00
|
|
|
mib[5] = 0;
|
1998-01-23 21:37:27 +00:00
|
|
|
|
1998-01-19 02:59:34 +00:00
|
|
|
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LogERROR, "get_ether_addr: sysctl: estimate: %s\n",
|
1998-01-24 00:03:14 +00:00
|
|
|
strerror(errno));
|
1998-01-19 02:59:34 +00:00
|
|
|
return 0;
|
|
|
|
}
|
1998-01-23 21:37:27 +00:00
|
|
|
|
|
|
|
if ((buf = malloc(needed)) == NULL)
|
1998-01-19 02:59:34 +00:00
|
|
|
return 0;
|
1998-01-23 21:37:27 +00:00
|
|
|
|
|
|
|
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
|
|
|
|
free(buf);
|
1998-01-19 02:59:34 +00:00
|
|
|
return 0;
|
|
|
|
}
|
1998-01-23 21:37:27 +00:00
|
|
|
end = buf + needed;
|
|
|
|
|
|
|
|
ptr = buf;
|
|
|
|
while (ptr < end) {
|
|
|
|
ifm = (struct if_msghdr *)ptr; /* On if_msghdr */
|
|
|
|
if (ifm->ifm_type != RTM_IFINFO)
|
|
|
|
break;
|
|
|
|
dl = (struct sockaddr_dl *)(ifm + 1); /* Single _dl at end */
|
|
|
|
skip = (ifm->ifm_flags & (IFF_UP | IFF_BROADCAST | IFF_POINTOPOINT |
|
|
|
|
IFF_NOARP | IFF_LOOPBACK)) != (IFF_UP | IFF_BROADCAST);
|
|
|
|
ptr += ifm->ifm_msglen; /* First ifa_msghdr */
|
|
|
|
while (ptr < end) {
|
|
|
|
ifam = (struct ifa_msghdr *)ptr; /* Next ifa_msghdr (alias) */
|
|
|
|
if (ifam->ifam_type != RTM_NEWADDR) /* finished ? */
|
|
|
|
break;
|
|
|
|
sa = (struct sockaddr *)(ifam+1); /* pile of sa's at end */
|
|
|
|
ptr += ifam->ifam_msglen;
|
|
|
|
if (skip || (ifam->ifam_addrs & (RTA_NETMASK|RTA_IFA)) !=
|
|
|
|
(RTA_NETMASK|RTA_IFA))
|
|
|
|
continue;
|
|
|
|
/* Found a candidate. Do the addresses match ? */
|
1998-05-01 19:26:12 +00:00
|
|
|
if (log_IsKept(LogDEBUG) &&
|
1998-01-23 21:37:27 +00:00
|
|
|
ptr == (char *)ifm + ifm->ifm_msglen + ifam->ifam_msglen)
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LogDEBUG, "%.*s interface is a candidate for proxy\n",
|
1998-01-23 21:37:27 +00:00
|
|
|
dl->sdl_nlen, dl->sdl_data);
|
|
|
|
b = 1;
|
1998-01-23 22:29:16 +00:00
|
|
|
ifa = mask = NULL;
|
1998-01-23 21:37:27 +00:00
|
|
|
while (b < (RTA_NETMASK|RTA_IFA) && sa < (struct sockaddr *)ptr) {
|
|
|
|
switch (b) {
|
|
|
|
case RTA_IFA:
|
|
|
|
ifa = (struct sockaddr_in *)sa;
|
|
|
|
break;
|
|
|
|
case RTA_NETMASK:
|
|
|
|
/*
|
|
|
|
* Careful here ! this sockaddr doesn't have sa_family set to
|
|
|
|
* AF_INET, and is only 8 bytes big ! I have no idea why !
|
|
|
|
*/
|
|
|
|
mask = (struct sockaddr_in *)sa;
|
|
|
|
break;
|
1998-01-19 02:59:34 +00:00
|
|
|
}
|
1998-01-23 21:37:27 +00:00
|
|
|
if (ifam->ifam_addrs & b) {
|
|
|
|
#define ALN sizeof(ifa->sin_addr.s_addr)
|
|
|
|
sa_len = sa->sa_len > 0 ? ((sa->sa_len-1)|(ALN-1))+1 : ALN;
|
|
|
|
sa = (struct sockaddr *)((char *)sa + sa_len);
|
|
|
|
}
|
|
|
|
b <<= 1;
|
|
|
|
}
|
1998-05-01 19:26:12 +00:00
|
|
|
if (log_IsKept(LogDEBUG)) {
|
1998-01-23 21:37:27 +00:00
|
|
|
char a[16];
|
|
|
|
strncpy(a, inet_ntoa(mask->sin_addr), sizeof a - 1);
|
|
|
|
a[sizeof a - 1] = '\0';
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LogDEBUG, "Check addr %s, mask %s\n",
|
1998-01-23 21:37:27 +00:00
|
|
|
inet_ntoa(ifa->sin_addr), a);
|
|
|
|
}
|
|
|
|
if (ifa->sin_family == AF_INET &&
|
|
|
|
(ifa->sin_addr.s_addr & mask->sin_addr.s_addr) ==
|
|
|
|
(ipaddr.s_addr & mask->sin_addr.s_addr)) {
|
1998-05-01 19:26:12 +00:00
|
|
|
log_Printf(LogPHASE, "Found interface %.*s for %s\n",
|
1998-04-23 23:50:40 +00:00
|
|
|
dl->sdl_alen, dl->sdl_data, inet_ntoa(ipaddr));
|
1998-01-23 21:37:27 +00:00
|
|
|
memcpy(hwaddr, dl, dl->sdl_len);
|
|
|
|
free(buf);
|
|
|
|
return 1;
|
1998-01-19 02:59:34 +00:00
|
|
|
}
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|
1997-08-25 00:29:32 +00:00
|
|
|
}
|
1998-01-23 21:37:27 +00:00
|
|
|
free(buf);
|
|
|
|
|
1997-08-25 00:29:32 +00:00
|
|
|
return 0;
|
1995-02-26 12:18:08 +00:00
|
|
|
}
|