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be2ae246fb
- this is consistent with IPv6 route - you can get very confused, if there are no routes and "route" prints nothing at all (not even "No routes" message)
706 lines
17 KiB
C
706 lines
17 KiB
C
/* route
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*
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* Similar to the standard Unix route, but with only the necessary
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* parts for AF_INET and AF_INET6
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*
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* Bjorn Wesen, Axis Communications AB
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*
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* Author of the original route:
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* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
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* (derived from FvK's 'route.c 1.70 01/04/94')
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*
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* This program is free software; you can redistribute it
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* and/or modify it under the terms of the GNU General
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* Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* $Id: route.c,v 1.21 2002/12/16 22:04:18 sandman Exp $
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*
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* displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
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* adjustments by Larry Doolittle <LRDoolittle@lbl.gov>
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*
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* IPV6 support added by Bart Visscher <magick@linux-fan.com>
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include "inet_common.h"
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#include <net/route.h>
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#include <net/if.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <getopt.h>
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#include <unistd.h>
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#include <ctype.h>
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#include "busybox.h"
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#define _(x) x
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#define RTACTION_ADD 1
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#define RTACTION_DEL 2
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#define RTACTION_HELP 3
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#define RTACTION_FLUSH 4
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#define RTACTION_SHOW 5
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#define E_NOTFOUND 8
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#define E_SOCK 7
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#define E_LOOKUP 6
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#define E_VERSION 5
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#define E_USAGE 4
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#define E_OPTERR 3
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#define E_INTERN 2
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#define E_NOSUPP 1
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#if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */
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#define HAVE_NEW_ADDRT 1
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#endif
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#ifdef RTF_IRTT /* route */
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#define HAVE_RTF_IRTT 1
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#endif
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#ifdef RTF_REJECT /* route */
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#define HAVE_RTF_REJECT 1
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#endif
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#if HAVE_NEW_ADDRT
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#define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
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#define full_mask(x) (x)
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#else
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#define mask_in_addr(x) ((x).rt_genmask)
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#define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
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#endif
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/* add or delete a route depending on action */
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static int INET_setroute(int action, int options, char **args)
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{
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struct rtentry rt;
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char target[128], gateway[128] = "NONE";
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const char *netmask = bb_INET_default;
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int xflag, isnet;
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int skfd;
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xflag = 0;
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if (*args == NULL)
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show_usage();
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if (strcmp(*args, "-net") == 0) {
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xflag = 1;
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args++;
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} else if (strcmp(*args, "-host") == 0) {
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xflag = 2;
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args++;
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}
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if (*args == NULL)
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show_usage();
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safe_strncpy(target, *args++, (sizeof target));
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/* Clean out the RTREQ structure. */
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memset((char *) &rt, 0, sizeof(struct rtentry));
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if ((isnet =
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INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
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xflag != 1)) < 0) {
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error_msg(_("can't resolve %s"), target);
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return EXIT_FAILURE; /* XXX change to E_something */
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}
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switch (xflag) {
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case 1:
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isnet = 1;
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break;
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case 2:
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isnet = 0;
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break;
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default:
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break;
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}
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/* Fill in the other fields. */
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rt.rt_flags = (RTF_UP | RTF_HOST);
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if (isnet)
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rt.rt_flags &= ~RTF_HOST;
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while (*args) {
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if (strcmp(*args, "metric") == 0) {
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int metric;
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args++;
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if (!*args || !isdigit(**args))
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show_usage();
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metric = atoi(*args);
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#if HAVE_NEW_ADDRT
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rt.rt_metric = metric + 1;
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#else
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ENOSUPP("inet_setroute", "NEW_ADDRT (metric)"); /* XXX Fixme */
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#endif
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args++;
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continue;
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}
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if (strcmp(*args, "netmask") == 0) {
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struct sockaddr mask;
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args++;
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if (!*args || mask_in_addr(rt))
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show_usage();
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netmask = *args;
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if ((isnet =
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INET_resolve(netmask, (struct sockaddr_in *) &mask,
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0)) < 0) {
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error_msg(_("can't resolve netmask %s"), netmask);
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return E_LOOKUP;
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}
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rt.rt_genmask = full_mask(mask);
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args++;
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continue;
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}
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if (strcmp(*args, "gw") == 0 || strcmp(*args, "gateway") == 0) {
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args++;
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if (!*args)
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show_usage();
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if (rt.rt_flags & RTF_GATEWAY)
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show_usage();
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safe_strncpy(gateway, *args, (sizeof gateway));
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if ((isnet =
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INET_resolve(gateway, (struct sockaddr_in *) &rt.rt_gateway,
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1)) < 0) {
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error_msg(_("can't resolve gw %s"), gateway);
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return E_LOOKUP;
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}
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if (isnet) {
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error_msg(_("%s: cannot use a NETWORK as gateway!"), gateway);
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return E_OPTERR;
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}
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rt.rt_flags |= RTF_GATEWAY;
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args++;
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continue;
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}
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if (strcmp(*args, "mss") == 0) {
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args++;
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rt.rt_flags |= RTF_MSS;
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if (!*args)
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show_usage();
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rt.rt_mss = atoi(*args);
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args++;
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if (rt.rt_mss < 64 || rt.rt_mss > 32768) {
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error_msg(_("Invalid MSS."));
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return E_OPTERR;
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}
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continue;
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}
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if (strcmp(*args, "window") == 0) {
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args++;
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if (!*args)
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show_usage();
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rt.rt_flags |= RTF_WINDOW;
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rt.rt_window = atoi(*args);
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args++;
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if (rt.rt_window < 128) {
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error_msg(_("Invalid window."));
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return E_OPTERR;
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}
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continue;
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}
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if (strcmp(*args, "irtt") == 0) {
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args++;
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if (!*args)
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show_usage();
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args++;
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#if HAVE_RTF_IRTT
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rt.rt_flags |= RTF_IRTT;
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rt.rt_irtt = atoi(*(args - 1));
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rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 100); /* FIXME */
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#if 0 /* FIXME: do we need to check anything of this? */
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if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
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error_msg(_("Invalid initial rtt."));
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return E_OPTERR;
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}
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#endif
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#else
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ENOSUPP("inet_setroute", "RTF_IRTT"); /* XXX Fixme */
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#endif
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continue;
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}
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if (strcmp(*args, "reject") == 0) {
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args++;
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#if HAVE_RTF_REJECT
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rt.rt_flags |= RTF_REJECT;
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#else
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ENOSUPP("inet_setroute", "RTF_REJECT"); /* XXX Fixme */
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#endif
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continue;
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}
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if (strcmp(*args, "mod") == 0) {
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args++;
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rt.rt_flags |= RTF_MODIFIED;
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continue;
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}
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if (strcmp(*args, "dyn") == 0) {
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args++;
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rt.rt_flags |= RTF_DYNAMIC;
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continue;
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}
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if (strcmp(*args, "reinstate") == 0) {
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args++;
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rt.rt_flags |= RTF_REINSTATE;
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continue;
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}
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if (strcmp(*args, "device") == 0 || strcmp(*args, "dev") == 0) {
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args++;
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if (rt.rt_dev || *args == NULL)
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show_usage();
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rt.rt_dev = *args++;
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continue;
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}
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/* nothing matches */
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if (!rt.rt_dev) {
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rt.rt_dev = *args++;
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if (*args)
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show_usage(); /* must be last to catch typos */
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} else {
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show_usage();
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}
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}
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#if HAVE_RTF_REJECT
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if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev)
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rt.rt_dev = "lo";
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#endif
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/* sanity checks.. */
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if (mask_in_addr(rt)) {
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unsigned long mask = mask_in_addr(rt);
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mask = ~ntohl(mask);
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if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
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error_msg(_("netmask %.8x doesn't make sense with host route"),
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(unsigned int) mask);
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return E_OPTERR;
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}
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if (mask & (mask + 1)) {
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error_msg(_("bogus netmask %s"), netmask);
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return E_OPTERR;
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}
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mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
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if (mask & ~mask_in_addr(rt)) {
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error_msg(_("netmask doesn't match route address"));
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return E_OPTERR;
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}
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}
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/* Fill out netmask if still unset */
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if ((action == RTACTION_ADD) && rt.rt_flags & RTF_HOST)
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mask_in_addr(rt) = 0xffffffff;
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/* Create a socket to the INET kernel. */
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if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
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perror("socket");
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return E_SOCK;
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}
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/* Tell the kernel to accept this route. */
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if (action == RTACTION_DEL) {
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if (ioctl(skfd, SIOCDELRT, &rt) < 0) {
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perror("SIOCDELRT");
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close(skfd);
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return E_SOCK;
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}
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} else {
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if (ioctl(skfd, SIOCADDRT, &rt) < 0) {
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perror("SIOCADDRT");
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close(skfd);
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return E_SOCK;
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}
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}
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/* Close the socket. */
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(void) close(skfd);
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return EXIT_SUCCESS;
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}
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#ifdef CONFIG_FEATURE_IPV6
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static int INET6_setroute(int action, int options, char **args)
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{
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struct in6_rtmsg rt;
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struct ifreq ifr;
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struct sockaddr_in6 sa6;
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char target[128], gateway[128] = "NONE";
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int metric, prefix_len;
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char *devname = NULL;
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char *cp;
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int skfd;
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if (*args == NULL)
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show_usage();
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strcpy(target, *args++);
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if (!strcmp(target, "default")) {
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prefix_len = 0;
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memset(&sa6, 0, sizeof(sa6));
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} else {
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if ((cp = strchr(target, '/'))) {
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prefix_len = atol(cp + 1);
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if ((prefix_len < 0) || (prefix_len > 128))
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show_usage();
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*cp = 0;
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} else {
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prefix_len = 128;
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}
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if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
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error_msg(_("can't resolve %s"), target);
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return EXIT_FAILURE; /* XXX change to E_something */
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}
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}
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/* Clean out the RTREQ structure. */
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memset((char *) &rt, 0, sizeof(struct in6_rtmsg));
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memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
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/* Fill in the other fields. */
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rt.rtmsg_flags = RTF_UP;
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if (prefix_len == 128)
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rt.rtmsg_flags |= RTF_HOST;
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rt.rtmsg_metric = 1;
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rt.rtmsg_dst_len = prefix_len;
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while (*args) {
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if (!strcmp(*args, "metric")) {
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args++;
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if (!*args || !isdigit(**args))
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show_usage();
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metric = atoi(*args);
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rt.rtmsg_metric = metric;
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args++;
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continue;
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}
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if (!strcmp(*args, "gw") || !strcmp(*args, "gateway")) {
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args++;
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if (!*args)
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show_usage();
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if (rt.rtmsg_flags & RTF_GATEWAY)
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show_usage();
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strcpy(gateway, *args);
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if (INET6_resolve(gateway, (struct sockaddr_in6 *) &sa6) < 0) {
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error_msg(_("can't resolve gw %s"), gateway);
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return (E_LOOKUP);
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}
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memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
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sizeof(struct in6_addr));
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rt.rtmsg_flags |= RTF_GATEWAY;
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args++;
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continue;
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}
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if (!strcmp(*args, "mod")) {
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args++;
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rt.rtmsg_flags |= RTF_MODIFIED;
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continue;
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}
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if (!strcmp(*args, "dyn")) {
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args++;
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rt.rtmsg_flags |= RTF_DYNAMIC;
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continue;
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}
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if (!strcmp(*args, "device") || !strcmp(*args, "dev")) {
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args++;
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if (!*args)
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show_usage();
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} else if (args[1])
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show_usage();
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devname = *args;
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args++;
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}
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/* Create a socket to the INET6 kernel. */
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if ((skfd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
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perror("socket");
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return (E_SOCK);
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}
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if (devname) {
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memset(&ifr, 0, sizeof(ifr));
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strcpy(ifr.ifr_name, devname);
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if (ioctl(skfd, SIOGIFINDEX, &ifr) < 0) {
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perror("SIOGIFINDEX");
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return (E_SOCK);
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}
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rt.rtmsg_ifindex = ifr.ifr_ifindex;
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} else
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rt.rtmsg_ifindex = 0;
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/* Tell the kernel to accept this route. */
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if (action == RTACTION_DEL) {
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if (ioctl(skfd, SIOCDELRT, &rt) < 0) {
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perror("SIOCDELRT");
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close(skfd);
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return (E_SOCK);
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}
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} else {
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if (ioctl(skfd, SIOCADDRT, &rt) < 0) {
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perror("SIOCADDRT");
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close(skfd);
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return (E_SOCK);
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}
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}
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/* Close the socket. */
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(void) close(skfd);
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return (0);
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}
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#endif
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#ifndef RTF_UP
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/* Keep this in sync with /usr/src/linux/include/linux/route.h */
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#define RTF_UP 0x0001 /* route usable */
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#define RTF_GATEWAY 0x0002 /* destination is a gateway */
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#define RTF_HOST 0x0004 /* host entry (net otherwise) */
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#define RTF_REINSTATE 0x0008 /* reinstate route after tmout */
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#define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */
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#define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */
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#define RTF_MTU 0x0040 /* specific MTU for this route */
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#ifndef RTF_MSS
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#define RTF_MSS RTF_MTU /* Compatibility :-( */
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#endif
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#define RTF_WINDOW 0x0080 /* per route window clamping */
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#define RTF_IRTT 0x0100 /* Initial round trip time */
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#define RTF_REJECT 0x0200 /* Reject route */
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#endif
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void displayroutes(int noresolve, int netstatfmt)
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{
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char buff[256];
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int nl = 0;
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struct in_addr dest;
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struct in_addr gw;
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struct in_addr mask;
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int flgs, ref, use, metric, mtu, win, ir;
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char flags[64];
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unsigned long int d, g, m;
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char sdest[16], sgw[16];
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FILE *fp = xfopen("/proc/net/route", "r");
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if (noresolve)
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noresolve = 0x0fff;
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printf("Kernel IP routing table\n");
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printf
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("Destination Gateway Genmask Flags %s Iface\n",
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netstatfmt ? " MSS Window irtt" : "Metric Ref Use");
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while (fgets(buff, sizeof(buff), fp) != NULL) {
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if (nl) {
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int ifl = 0;
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int numeric;
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struct sockaddr_in s_addr;
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while (buff[ifl] != ' ' && buff[ifl] != '\t' && buff[ifl] != '\0')
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ifl++;
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buff[ifl] = 0; /* interface */
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if (sscanf(buff + ifl + 1, "%lx%lx%X%d%d%d%lx%d%d%d",
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&d, &g, &flgs, &ref, &use, &metric, &m, &mtu, &win,
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&ir) != 10) {
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error_msg_and_die("Unsuported kernel route format\n");
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}
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ifl = 0; /* parse flags */
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if (flgs & RTF_UP) {
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if (flgs & RTF_REJECT)
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flags[ifl++] = '!';
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else
|
|
flags[ifl++] = 'U';
|
|
if (flgs & RTF_GATEWAY)
|
|
flags[ifl++] = 'G';
|
|
if (flgs & RTF_HOST)
|
|
flags[ifl++] = 'H';
|
|
if (flgs & RTF_REINSTATE)
|
|
flags[ifl++] = 'R';
|
|
if (flgs & RTF_DYNAMIC)
|
|
flags[ifl++] = 'D';
|
|
if (flgs & RTF_MODIFIED)
|
|
flags[ifl++] = 'M';
|
|
flags[ifl] = 0;
|
|
dest.s_addr = d;
|
|
gw.s_addr = g;
|
|
mask.s_addr = m;
|
|
memset(&s_addr, 0, sizeof(struct sockaddr_in));
|
|
s_addr.sin_family = AF_INET;
|
|
s_addr.sin_addr = dest;
|
|
numeric = noresolve | 0x8000; /* default instead of * */
|
|
INET_rresolve(sdest, sizeof(sdest), &s_addr, numeric, m);
|
|
numeric = noresolve | 0x4000; /* host instead of net */
|
|
s_addr.sin_addr = gw;
|
|
INET_rresolve(sgw, sizeof(sgw), &s_addr, numeric, m);
|
|
|
|
printf("%-16s%-16s%-16s%-6s", sdest, sgw, inet_ntoa(mask),
|
|
flags);
|
|
if (netstatfmt)
|
|
printf("%5d %-5d %6d %s\n", mtu, win, ir, buff);
|
|
else
|
|
printf("%-6d %-2d %7d %s\n", metric, ref, use, buff);
|
|
}
|
|
}
|
|
nl++;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_IPV6
|
|
static void INET6_displayroutes(int noresolve)
|
|
{
|
|
char buff[256];
|
|
char iface[16], flags[16];
|
|
char addr6[128], naddr6[128];
|
|
struct sockaddr_in6 saddr6, snaddr6;
|
|
int iflags, metric, refcnt, use, prefix_len, slen;
|
|
int numeric;
|
|
|
|
char addr6p[8][5], saddr6p[8][5], naddr6p[8][5];
|
|
|
|
FILE *fp = xfopen("/proc/net/ipv6_route", "r");
|
|
|
|
flags[0] = 'U';
|
|
|
|
if (noresolve)
|
|
noresolve = 0x0fff;
|
|
numeric = noresolve | 0x8000; /* default instead of * */
|
|
|
|
printf("Kernel IPv6 routing table\n"
|
|
"Destination "
|
|
"Next Hop "
|
|
"Flags Metric Ref Use Iface\n");
|
|
|
|
while (fgets(buff, sizeof(buff), fp) != NULL) {
|
|
int ifl;
|
|
|
|
if (sscanf(buff, "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
|
|
"%4s%4s%4s%4s%4s%4s%4s%4s %02x "
|
|
"%4s%4s%4s%4s%4s%4s%4s%4s %08x %08x %08x %08x %s\n",
|
|
addr6p[0], addr6p[1], addr6p[2], addr6p[3],
|
|
addr6p[4], addr6p[5], addr6p[6], addr6p[7],
|
|
&prefix_len,
|
|
saddr6p[0], saddr6p[1], saddr6p[2], saddr6p[3],
|
|
saddr6p[4], saddr6p[5], saddr6p[6], saddr6p[7],
|
|
&slen,
|
|
naddr6p[0], naddr6p[1], naddr6p[2], naddr6p[3],
|
|
naddr6p[4], naddr6p[5], naddr6p[6], naddr6p[7],
|
|
&metric, &use, &refcnt, &iflags, iface) != 31) {
|
|
error_msg_and_die("Unsuported kernel route format\n");
|
|
}
|
|
|
|
ifl = 1; /* parse flags */
|
|
if (!(iflags & RTF_UP))
|
|
continue;
|
|
if (iflags & RTF_GATEWAY)
|
|
flags[ifl++] = 'G';
|
|
if (iflags & RTF_HOST)
|
|
flags[ifl++] = 'H';
|
|
if (iflags & RTF_DEFAULT)
|
|
flags[ifl++] = 'D';
|
|
if (iflags & RTF_ADDRCONF)
|
|
flags[ifl++] = 'A';
|
|
if (iflags & RTF_CACHE)
|
|
flags[ifl++] = 'C';
|
|
flags[ifl] = 0;
|
|
|
|
/* Fetch and resolve the target address. */
|
|
snprintf(addr6, sizeof(addr6), "%s:%s:%s:%s:%s:%s:%s:%s",
|
|
addr6p[0], addr6p[1], addr6p[2], addr6p[3],
|
|
addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
|
|
inet_pton(AF_INET6, addr6, (struct sockaddr *) &saddr6.sin6_addr);
|
|
saddr6.sin6_family = AF_INET6;
|
|
|
|
INET6_rresolve(addr6, sizeof(addr6), (struct sockaddr_in6 *) &saddr6,
|
|
numeric);
|
|
snprintf(addr6, sizeof(addr6), "%s/%d", addr6, prefix_len);
|
|
|
|
/* Fetch and resolve the nexthop address. */
|
|
snprintf(naddr6, sizeof(naddr6), "%s:%s:%s:%s:%s:%s:%s:%s",
|
|
naddr6p[0], naddr6p[1], naddr6p[2], naddr6p[3],
|
|
naddr6p[4], naddr6p[5], naddr6p[6], naddr6p[7]);
|
|
inet_pton(AF_INET6, naddr6, (struct sockaddr *) &snaddr6.sin6_addr);
|
|
snaddr6.sin6_family = AF_INET6;
|
|
|
|
INET6_rresolve(naddr6, sizeof(naddr6),
|
|
(struct sockaddr_in6 *) &snaddr6, numeric);
|
|
|
|
/* Print the info. */
|
|
printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
|
|
addr6, naddr6, flags, metric, refcnt, use, iface);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
int route_main(int argc, char **argv)
|
|
{
|
|
int opt;
|
|
int what = 0;
|
|
|
|
#ifdef CONFIG_FEATURE_IPV6
|
|
int af = AF_INET;
|
|
#endif
|
|
|
|
if (!argv[1] || (argv[1][0] == '-')) {
|
|
/* check options */
|
|
int noresolve = 0;
|
|
int extended = 0;
|
|
|
|
while ((opt = getopt(argc, argv, "A:ne")) > 0) {
|
|
switch (opt) {
|
|
case 'n':
|
|
noresolve = 1;
|
|
break;
|
|
case 'e':
|
|
extended = 1;
|
|
break;
|
|
case 'A':
|
|
#ifdef CONFIG_FEATURE_IPV6
|
|
if (strcmp(optarg, "inet6") == 0)
|
|
af = AF_INET6;
|
|
break;
|
|
#endif
|
|
default:
|
|
show_usage();
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_IPV6
|
|
if (af == AF_INET6)
|
|
INET6_displayroutes(*argv != NULL);
|
|
else
|
|
#endif
|
|
displayroutes(noresolve, extended);
|
|
return EXIT_SUCCESS;
|
|
} else {
|
|
/* check verb */
|
|
if (strcmp(argv[1], "add") == 0)
|
|
what = RTACTION_ADD;
|
|
else if (strcmp(argv[1], "del") == 0
|
|
|| strcmp(argv[1], "delete") == 0)
|
|
what = RTACTION_DEL;
|
|
else if (strcmp(argv[1], "flush") == 0)
|
|
what = RTACTION_FLUSH;
|
|
else
|
|
show_usage();
|
|
}
|
|
|
|
#ifdef CONFIG_FEATURE_IPV6
|
|
if (af == AF_INET6)
|
|
return INET6_setroute(what, 0, argv + 2);
|
|
#endif
|
|
return INET_setroute(what, 0, argv + 2);
|
|
}
|