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69051e817c
hush/networking/route.c
Glenn L McGrath 7c58e9be69 Run through indent, fix comment
2002-08-22 18:24:43 +00:00

708 lines
17 KiB
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/* route
*
* Similar to the standard Unix route, but with only the necessary
* parts for AF_INET and AF_INET6
*
* Bjorn Wesen, Axis Communications AB
*
* Author of the original route:
* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
* (derived from FvK's 'route.c 1.70 01/04/94')
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General
* Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* $Id: route.c,v 1.18 2002/08/22 18:24:43 bug1 Exp $
*
* displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
* adjustments by Larry Doolittle <LRDoolittle@lbl.gov>
*
* IPV6 support added by Bart Visscher <magick@linux-fan.com>
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include "inet_common.h"
#include <net/route.h>
#include <net/if.h>
#include <linux/param.h> /* HZ */
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <ctype.h>
#include "busybox.h"
#define _(x) x
#define RTACTION_ADD 1
#define RTACTION_DEL 2
#define RTACTION_HELP 3
#define RTACTION_FLUSH 4
#define RTACTION_SHOW 5
#define E_NOTFOUND 8
#define E_SOCK 7
#define E_LOOKUP 6
#define E_VERSION 5
#define E_USAGE 4
#define E_OPTERR 3
#define E_INTERN 2
#define E_NOSUPP 1
#if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */
#define HAVE_NEW_ADDRT 1
#endif
#ifdef RTF_IRTT /* route */
#define HAVE_RTF_IRTT 1
#endif
#ifdef RTF_REJECT /* route */
#define HAVE_RTF_REJECT 1
#endif
#if HAVE_NEW_ADDRT
#define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
#define full_mask(x) (x)
#else
#define mask_in_addr(x) ((x).rt_genmask)
#define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
#endif
/* add or delete a route depending on action */
static int INET_setroute(int action, int options, char **args)
{
struct rtentry rt;
char target[128], gateway[128] = "NONE";
const char *netmask = bb_INET_default;
int xflag, isnet;
int skfd;
xflag = 0;
if (*args == NULL)
show_usage();
if (strcmp(*args, "-net") == 0) {
xflag = 1;
args++;
} else if (strcmp(*args, "-host") == 0) {
xflag = 2;
args++;
}
if (*args == NULL)
show_usage();
safe_strncpy(target, *args++, (sizeof target));
/* Clean out the RTREQ structure. */
memset((char *) &rt, 0, sizeof(struct rtentry));
if ((isnet =
INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
xflag != 1)) < 0) {
error_msg(_("can't resolve %s"), target);
return EXIT_FAILURE; /* XXX change to E_something */
}
switch (xflag) {
case 1:
isnet = 1;
break;
case 2:
isnet = 0;
break;
default:
break;
}
/* Fill in the other fields. */
rt.rt_flags = (RTF_UP | RTF_HOST);
if (isnet)
rt.rt_flags &= ~RTF_HOST;
while (*args) {
if (strcmp(*args, "metric") == 0) {
int metric;
args++;
if (!*args || !isdigit(**args))
show_usage();
metric = atoi(*args);
#if HAVE_NEW_ADDRT
rt.rt_metric = metric + 1;
#else
ENOSUPP("inet_setroute", "NEW_ADDRT (metric)"); /* XXX Fixme */
#endif
args++;
continue;
}
if (strcmp(*args, "netmask") == 0) {
struct sockaddr mask;
args++;
if (!*args || mask_in_addr(rt))
show_usage();
netmask = *args;
if ((isnet =
INET_resolve(netmask, (struct sockaddr_in *) &mask,
0)) < 0) {
error_msg(_("can't resolve netmask %s"), netmask);
return E_LOOKUP;
}
rt.rt_genmask = full_mask(mask);
args++;
continue;
}
if (strcmp(*args, "gw") == 0 || strcmp(*args, "gateway") == 0) {
args++;
if (!*args)
show_usage();
if (rt.rt_flags & RTF_GATEWAY)
show_usage();
safe_strncpy(gateway, *args, (sizeof gateway));
if ((isnet =
INET_resolve(gateway, (struct sockaddr_in *) &rt.rt_gateway,
1)) < 0) {
error_msg(_("can't resolve gw %s"), gateway);
return E_LOOKUP;
}
if (isnet) {
error_msg(_("%s: cannot use a NETWORK as gateway!"), gateway);
return E_OPTERR;
}
rt.rt_flags |= RTF_GATEWAY;
args++;
continue;
}
if (strcmp(*args, "mss") == 0) {
args++;
rt.rt_flags |= RTF_MSS;
if (!*args)
show_usage();
rt.rt_mss = atoi(*args);
args++;
if (rt.rt_mss < 64 || rt.rt_mss > 32768) {
error_msg(_("Invalid MSS."));
return E_OPTERR;
}
continue;
}
if (strcmp(*args, "window") == 0) {
args++;
if (!*args)
show_usage();
rt.rt_flags |= RTF_WINDOW;
rt.rt_window = atoi(*args);
args++;
if (rt.rt_window < 128) {
error_msg(_("Invalid window."));
return E_OPTERR;
}
continue;
}
if (strcmp(*args, "irtt") == 0) {
args++;
if (!*args)
show_usage();
args++;
#if HAVE_RTF_IRTT
rt.rt_flags |= RTF_IRTT;
rt.rt_irtt = atoi(*(args - 1));
rt.rt_irtt *= (HZ / 100); /* FIXME */
#if 0 /* FIXME: do we need to check anything of this? */
if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
error_msg(_("Invalid initial rtt."));
return E_OPTERR;
}
#endif
#else
ENOSUPP("inet_setroute", "RTF_IRTT"); /* XXX Fixme */
#endif
continue;
}
if (strcmp(*args, "reject") == 0) {
args++;
#if HAVE_RTF_REJECT
rt.rt_flags |= RTF_REJECT;
#else
ENOSUPP("inet_setroute", "RTF_REJECT"); /* XXX Fixme */
#endif
continue;
}
if (strcmp(*args, "mod") == 0) {
args++;
rt.rt_flags |= RTF_MODIFIED;
continue;
}
if (strcmp(*args, "dyn") == 0) {
args++;
rt.rt_flags |= RTF_DYNAMIC;
continue;
}
if (strcmp(*args, "reinstate") == 0) {
args++;
rt.rt_flags |= RTF_REINSTATE;
continue;
}
if (strcmp(*args, "device") == 0 || strcmp(*args, "dev") == 0) {
args++;
if (rt.rt_dev || *args == NULL)
show_usage();
rt.rt_dev = *args++;
continue;
}
/* nothing matches */
if (!rt.rt_dev) {
rt.rt_dev = *args++;
if (*args)
show_usage(); /* must be last to catch typos */
} else {
show_usage();
}
}
#if HAVE_RTF_REJECT
if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev)
rt.rt_dev = "lo";
#endif
/* sanity checks.. */
if (mask_in_addr(rt)) {
unsigned long mask = mask_in_addr(rt);
mask = ~ntohl(mask);
if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
error_msg(_("netmask %.8x doesn't make sense with host route"),
(unsigned int) mask);
return E_OPTERR;
}
if (mask & (mask + 1)) {
error_msg(_("bogus netmask %s"), netmask);
return E_OPTERR;
}
mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
if (mask & ~mask_in_addr(rt)) {
error_msg(_("netmask doesn't match route address"));
return E_OPTERR;
}
}
/* Fill out netmask if still unset */
if ((action == RTACTION_ADD) && rt.rt_flags & RTF_HOST)
mask_in_addr(rt) = 0xffffffff;
/* Create a socket to the INET kernel. */
if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
return E_SOCK;
}
/* Tell the kernel to accept this route. */
if (action == RTACTION_DEL) {
if (ioctl(skfd, SIOCDELRT, &rt) < 0) {
perror("SIOCDELRT");
close(skfd);
return E_SOCK;
}
} else {
if (ioctl(skfd, SIOCADDRT, &rt) < 0) {
perror("SIOCADDRT");
close(skfd);
return E_SOCK;
}
}
/* Close the socket. */
(void) close(skfd);
return EXIT_SUCCESS;
}
#if CONFIG_FEATURE_IPV6
static int INET6_setroute(int action, int options, char **args)
{
struct in6_rtmsg rt;
struct ifreq ifr;
struct sockaddr_in6 sa6;
char target[128], gateway[128] = "NONE";
int metric, prefix_len;
char *devname = NULL;
char *cp;
int skfd;
if (*args == NULL)
show_usage();
strcpy(target, *args++);
if (!strcmp(target, "default")) {
prefix_len = 0;
memset(&sa6, 0, sizeof(sa6));
} else {
if ((cp = strchr(target, '/'))) {
prefix_len = atol(cp + 1);
if ((prefix_len < 0) || (prefix_len > 128))
show_usage();
*cp = 0;
} else {
prefix_len = 128;
}
if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
error_msg(_("can't resolve %s"), target);
return EXIT_FAILURE; /* XXX change to E_something */
}
}
/* Clean out the RTREQ structure. */
memset((char *) &rt, 0, sizeof(struct in6_rtmsg));
memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
/* Fill in the other fields. */
rt.rtmsg_flags = RTF_UP;
if (prefix_len == 128)
rt.rtmsg_flags |= RTF_HOST;
rt.rtmsg_metric = 1;
rt.rtmsg_dst_len = prefix_len;
while (*args) {
if (!strcmp(*args, "metric")) {
args++;
if (!*args || !isdigit(**args))
show_usage();
metric = atoi(*args);
rt.rtmsg_metric = metric;
args++;
continue;
}
if (!strcmp(*args, "gw") || !strcmp(*args, "gateway")) {
args++;
if (!*args)
show_usage();
if (rt.rtmsg_flags & RTF_GATEWAY)
show_usage();
strcpy(gateway, *args);
if (INET6_resolve(gateway, (struct sockaddr_in6 *) &sa6) < 0) {
error_msg(_("can't resolve gw %s"), gateway);
return (E_LOOKUP);
}
memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
sizeof(struct in6_addr));
rt.rtmsg_flags |= RTF_GATEWAY;
args++;
continue;
}
if (!strcmp(*args, "mod")) {
args++;
rt.rtmsg_flags |= RTF_MODIFIED;
continue;
}
if (!strcmp(*args, "dyn")) {
args++;
rt.rtmsg_flags |= RTF_DYNAMIC;
continue;
}
if (!strcmp(*args, "device") || !strcmp(*args, "dev")) {
args++;
if (!*args)
show_usage();
} else if (args[1])
show_usage();
devname = *args;
args++;
}
/* Create a socket to the INET6 kernel. */
if ((skfd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
perror("socket");
return (E_SOCK);
}
if (devname) {
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, devname);
if (ioctl(skfd, SIOGIFINDEX, &ifr) < 0) {
perror("SIOGIFINDEX");
return (E_SOCK);
}
rt.rtmsg_ifindex = ifr.ifr_ifindex;
} else
rt.rtmsg_ifindex = 0;
/* Tell the kernel to accept this route. */
if (action == RTACTION_DEL) {
if (ioctl(skfd, SIOCDELRT, &rt) < 0) {
perror("SIOCDELRT");
close(skfd);
return (E_SOCK);
}
} else {
if (ioctl(skfd, SIOCADDRT, &rt) < 0) {
perror("SIOCADDRT");
close(skfd);
return (E_SOCK);
}
}
/* Close the socket. */
(void) close(skfd);
return (0);
}
#endif
#ifndef RTF_UP
/* Keep this in sync with /usr/src/linux/include/linux/route.h */
#define RTF_UP 0x0001 /* route usable */
#define RTF_GATEWAY 0x0002 /* destination is a gateway */
#define RTF_HOST 0x0004 /* host entry (net otherwise) */
#define RTF_REINSTATE 0x0008 /* reinstate route after tmout */
#define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */
#define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */
#define RTF_MTU 0x0040 /* specific MTU for this route */
#ifndef RTF_MSS
#define RTF_MSS RTF_MTU /* Compatibility :-( */
#endif
#define RTF_WINDOW 0x0080 /* per route window clamping */
#define RTF_IRTT 0x0100 /* Initial round trip time */
#define RTF_REJECT 0x0200 /* Reject route */
#endif
void displayroutes(int noresolve, int netstatfmt)
{
char buff[256];
int nl = 0;
struct in_addr dest;
struct in_addr gw;
struct in_addr mask;
int flgs, ref, use, metric, mtu, win, ir;
char flags[64];
unsigned long int d, g, m;
char sdest[16], sgw[16];
FILE *fp = xfopen("/proc/net/route", "r");
if (noresolve)
noresolve = 0x0fff;
while (fgets(buff, sizeof(buff), fp) != NULL) {
if (nl) {
int ifl = 0;
int numeric;
struct sockaddr_in s_addr;
while (buff[ifl] != ' ' && buff[ifl] != '\t' && buff[ifl] != '\0')
ifl++;
buff[ifl] = 0; /* interface */
if (sscanf(buff + ifl + 1, "%lx%lx%X%d%d%d%lx%d%d%d",
&d, &g, &flgs, &ref, &use, &metric, &m, &mtu, &win,
&ir) != 10) {
error_msg_and_die("Unsuported kernel route format\n");
}
if (nl == 1) {
printf("Kernel IP routing table\n");
printf
("Destination Gateway Genmask Flags %s Iface\n",
netstatfmt ? " MSS Window irtt" : "Metric Ref Use");
}
ifl = 0; /* parse flags */
if (flgs & RTF_UP) {
if (flgs & RTF_REJECT)
flags[ifl++] = '!';
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++;
}
}
#if 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;
#if 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':
#if CONFIG_FEATURE_IPV6
if (strcmp(optarg, "inet6") == 0)
af = AF_INET6;
break;
#endif
default:
show_usage();
}
}
#if 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();
}
#if CONFIG_FEATURE_IPV6
if (af == AF_INET6)
return INET6_setroute(what, 0, argv + 2);
#endif
return INET_setroute(what, 0, argv + 2);
}
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