3 * Similar to the standard Unix route, but with only the necessary
4 * parts for AF_INET and AF_INET6
6 * Bjorn Wesen, Axis Communications AB
8 * Author of the original route:
9 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
10 * (derived from FvK's 'route.c 1.70 01/04/94')
12 * This program is free software; you can redistribute it
13 * and/or modify it under the terms of the GNU General
14 * Public License as published by the Free Software
15 * Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * $Id: route.c,v 1.19 2002/11/26 09:02:06 bug1 Exp $
20 * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
21 * adjustments by Larry Doolittle <LRDoolittle@lbl.gov>
23 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
26 #include <sys/types.h>
27 #include <sys/ioctl.h>
28 #include "inet_common.h"
29 #include <net/route.h>
31 #include <linux/param.h> /* HZ */
44 #define RTACTION_ADD 1
45 #define RTACTION_DEL 2
46 #define RTACTION_HELP 3
47 #define RTACTION_FLUSH 4
48 #define RTACTION_SHOW 5
59 #if defined (SIOCADDRTOLD) || defined (RTF_IRTT) /* route */
60 #define HAVE_NEW_ADDRT 1
62 #ifdef RTF_IRTT /* route */
63 #define HAVE_RTF_IRTT 1
65 #ifdef RTF_REJECT /* route */
66 #define HAVE_RTF_REJECT 1
70 #define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
71 #define full_mask(x) (x)
73 #define mask_in_addr(x) ((x).rt_genmask)
74 #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
79 /* add or delete a route depending on action */
81 static int INET_setroute(int action, int options, char **args)
84 char target[128], gateway[128] = "NONE";
85 const char *netmask = bb_INET_default;
93 if (strcmp(*args, "-net") == 0) {
96 } else if (strcmp(*args, "-host") == 0) {
102 safe_strncpy(target, *args++, (sizeof target));
104 /* Clean out the RTREQ structure. */
105 memset((char *) &rt, 0, sizeof(struct rtentry));
109 INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
111 error_msg(_("can't resolve %s"), target);
112 return EXIT_FAILURE; /* XXX change to E_something */
128 /* Fill in the other fields. */
129 rt.rt_flags = (RTF_UP | RTF_HOST);
131 rt.rt_flags &= ~RTF_HOST;
134 if (strcmp(*args, "metric") == 0) {
138 if (!*args || !isdigit(**args))
140 metric = atoi(*args);
142 rt.rt_metric = metric + 1;
144 ENOSUPP("inet_setroute", "NEW_ADDRT (metric)"); /* XXX Fixme */
150 if (strcmp(*args, "netmask") == 0) {
151 struct sockaddr mask;
154 if (!*args || mask_in_addr(rt))
158 INET_resolve(netmask, (struct sockaddr_in *) &mask,
160 error_msg(_("can't resolve netmask %s"), netmask);
163 rt.rt_genmask = full_mask(mask);
168 if (strcmp(*args, "gw") == 0 || strcmp(*args, "gateway") == 0) {
172 if (rt.rt_flags & RTF_GATEWAY)
174 safe_strncpy(gateway, *args, (sizeof gateway));
176 INET_resolve(gateway, (struct sockaddr_in *) &rt.rt_gateway,
178 error_msg(_("can't resolve gw %s"), gateway);
182 error_msg(_("%s: cannot use a NETWORK as gateway!"), gateway);
185 rt.rt_flags |= RTF_GATEWAY;
190 if (strcmp(*args, "mss") == 0) {
192 rt.rt_flags |= RTF_MSS;
195 rt.rt_mss = atoi(*args);
197 if (rt.rt_mss < 64 || rt.rt_mss > 32768) {
198 error_msg(_("Invalid MSS."));
204 if (strcmp(*args, "window") == 0) {
208 rt.rt_flags |= RTF_WINDOW;
209 rt.rt_window = atoi(*args);
211 if (rt.rt_window < 128) {
212 error_msg(_("Invalid window."));
218 if (strcmp(*args, "irtt") == 0) {
224 rt.rt_flags |= RTF_IRTT;
225 rt.rt_irtt = atoi(*(args - 1));
226 rt.rt_irtt *= (HZ / 100); /* FIXME */
227 #if 0 /* FIXME: do we need to check anything of this? */
228 if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
229 error_msg(_("Invalid initial rtt."));
234 ENOSUPP("inet_setroute", "RTF_IRTT"); /* XXX Fixme */
239 if (strcmp(*args, "reject") == 0) {
242 rt.rt_flags |= RTF_REJECT;
244 ENOSUPP("inet_setroute", "RTF_REJECT"); /* XXX Fixme */
248 if (strcmp(*args, "mod") == 0) {
250 rt.rt_flags |= RTF_MODIFIED;
253 if (strcmp(*args, "dyn") == 0) {
255 rt.rt_flags |= RTF_DYNAMIC;
258 if (strcmp(*args, "reinstate") == 0) {
260 rt.rt_flags |= RTF_REINSTATE;
263 if (strcmp(*args, "device") == 0 || strcmp(*args, "dev") == 0) {
265 if (rt.rt_dev || *args == NULL)
270 /* nothing matches */
274 show_usage(); /* must be last to catch typos */
281 if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev)
285 /* sanity checks.. */
286 if (mask_in_addr(rt)) {
287 unsigned long mask = mask_in_addr(rt);
290 if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
291 error_msg(_("netmask %.8x doesn't make sense with host route"),
292 (unsigned int) mask);
295 if (mask & (mask + 1)) {
296 error_msg(_("bogus netmask %s"), netmask);
299 mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
300 if (mask & ~mask_in_addr(rt)) {
301 error_msg(_("netmask doesn't match route address"));
305 /* Fill out netmask if still unset */
306 if ((action == RTACTION_ADD) && rt.rt_flags & RTF_HOST)
307 mask_in_addr(rt) = 0xffffffff;
309 /* Create a socket to the INET kernel. */
310 if ((skfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
314 /* Tell the kernel to accept this route. */
315 if (action == RTACTION_DEL) {
316 if (ioctl(skfd, SIOCDELRT, &rt) < 0) {
322 if (ioctl(skfd, SIOCADDRT, &rt) < 0) {
329 /* Close the socket. */
334 #ifdef CONFIG_FEATURE_IPV6
335 static int INET6_setroute(int action, int options, char **args)
339 struct sockaddr_in6 sa6;
340 char target[128], gateway[128] = "NONE";
341 int metric, prefix_len;
342 char *devname = NULL;
349 strcpy(target, *args++);
350 if (!strcmp(target, "default")) {
352 memset(&sa6, 0, sizeof(sa6));
354 if ((cp = strchr(target, '/'))) {
355 prefix_len = atol(cp + 1);
356 if ((prefix_len < 0) || (prefix_len > 128))
362 if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
363 error_msg(_("can't resolve %s"), target);
364 return EXIT_FAILURE; /* XXX change to E_something */
368 /* Clean out the RTREQ structure. */
369 memset((char *) &rt, 0, sizeof(struct in6_rtmsg));
371 memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
373 /* Fill in the other fields. */
374 rt.rtmsg_flags = RTF_UP;
375 if (prefix_len == 128)
376 rt.rtmsg_flags |= RTF_HOST;
378 rt.rtmsg_dst_len = prefix_len;
381 if (!strcmp(*args, "metric")) {
384 if (!*args || !isdigit(**args))
386 metric = atoi(*args);
387 rt.rtmsg_metric = metric;
391 if (!strcmp(*args, "gw") || !strcmp(*args, "gateway")) {
395 if (rt.rtmsg_flags & RTF_GATEWAY)
397 strcpy(gateway, *args);
398 if (INET6_resolve(gateway, (struct sockaddr_in6 *) &sa6) < 0) {
399 error_msg(_("can't resolve gw %s"), gateway);
402 memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
403 sizeof(struct in6_addr));
404 rt.rtmsg_flags |= RTF_GATEWAY;
408 if (!strcmp(*args, "mod")) {
410 rt.rtmsg_flags |= RTF_MODIFIED;
413 if (!strcmp(*args, "dyn")) {
415 rt.rtmsg_flags |= RTF_DYNAMIC;
418 if (!strcmp(*args, "device") || !strcmp(*args, "dev")) {
429 /* Create a socket to the INET6 kernel. */
430 if ((skfd = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
435 memset(&ifr, 0, sizeof(ifr));
436 strcpy(ifr.ifr_name, devname);
438 if (ioctl(skfd, SIOGIFINDEX, &ifr) < 0) {
439 perror("SIOGIFINDEX");
442 rt.rtmsg_ifindex = ifr.ifr_ifindex;
444 rt.rtmsg_ifindex = 0;
446 /* Tell the kernel to accept this route. */
447 if (action == RTACTION_DEL) {
448 if (ioctl(skfd, SIOCDELRT, &rt) < 0) {
454 if (ioctl(skfd, SIOCADDRT, &rt) < 0) {
461 /* Close the socket. */
468 /* Keep this in sync with /usr/src/linux/include/linux/route.h */
469 #define RTF_UP 0x0001 /* route usable */
470 #define RTF_GATEWAY 0x0002 /* destination is a gateway */
471 #define RTF_HOST 0x0004 /* host entry (net otherwise) */
472 #define RTF_REINSTATE 0x0008 /* reinstate route after tmout */
473 #define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */
474 #define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */
475 #define RTF_MTU 0x0040 /* specific MTU for this route */
477 #define RTF_MSS RTF_MTU /* Compatibility :-( */
479 #define RTF_WINDOW 0x0080 /* per route window clamping */
480 #define RTF_IRTT 0x0100 /* Initial round trip time */
481 #define RTF_REJECT 0x0200 /* Reject route */
484 void displayroutes(int noresolve, int netstatfmt)
491 int flgs, ref, use, metric, mtu, win, ir;
493 unsigned long int d, g, m;
495 char sdest[16], sgw[16];
497 FILE *fp = xfopen("/proc/net/route", "r");
502 while (fgets(buff, sizeof(buff), fp) != NULL) {
506 struct sockaddr_in s_addr;
508 while (buff[ifl] != ' ' && buff[ifl] != '\t' && buff[ifl] != '\0')
510 buff[ifl] = 0; /* interface */
511 if (sscanf(buff + ifl + 1, "%lx%lx%X%d%d%d%lx%d%d%d",
512 &d, &g, &flgs, &ref, &use, &metric, &m, &mtu, &win,
514 error_msg_and_die("Unsuported kernel route format\n");
517 printf("Kernel IP routing table\n");
519 ("Destination Gateway Genmask Flags %s Iface\n",
520 netstatfmt ? " MSS Window irtt" : "Metric Ref Use");
522 ifl = 0; /* parse flags */
524 if (flgs & RTF_REJECT)
528 if (flgs & RTF_GATEWAY)
532 if (flgs & RTF_REINSTATE)
534 if (flgs & RTF_DYNAMIC)
536 if (flgs & RTF_MODIFIED)
542 memset(&s_addr, 0, sizeof(struct sockaddr_in));
543 s_addr.sin_family = AF_INET;
544 s_addr.sin_addr = dest;
545 numeric = noresolve | 0x8000; /* default instead of * */
546 INET_rresolve(sdest, sizeof(sdest), &s_addr, numeric, m);
547 numeric = noresolve | 0x4000; /* host instead of net */
548 s_addr.sin_addr = gw;
549 INET_rresolve(sgw, sizeof(sgw), &s_addr, numeric, m);
551 printf("%-16s%-16s%-16s%-6s", sdest, sgw, inet_ntoa(mask),
554 printf("%5d %-5d %6d %s\n", mtu, win, ir, buff);
556 printf("%-6d %-2d %7d %s\n", metric, ref, use, buff);
563 #ifdef CONFIG_FEATURE_IPV6
564 static void INET6_displayroutes(int noresolve)
567 char iface[16], flags[16];
568 char addr6[128], naddr6[128];
569 struct sockaddr_in6 saddr6, snaddr6;
570 int iflags, metric, refcnt, use, prefix_len, slen;
573 char addr6p[8][5], saddr6p[8][5], naddr6p[8][5];
575 FILE *fp = xfopen("/proc/net/ipv6_route", "r");
581 numeric = noresolve | 0x8000; /* default instead of * */
583 printf("Kernel IPv6 routing table\n"
586 "Flags Metric Ref Use Iface\n");
588 while (fgets(buff, sizeof(buff), fp) != NULL) {
591 if (sscanf(buff, "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
592 "%4s%4s%4s%4s%4s%4s%4s%4s %02x "
593 "%4s%4s%4s%4s%4s%4s%4s%4s %08x %08x %08x %08x %s\n",
594 addr6p[0], addr6p[1], addr6p[2], addr6p[3],
595 addr6p[4], addr6p[5], addr6p[6], addr6p[7],
597 saddr6p[0], saddr6p[1], saddr6p[2], saddr6p[3],
598 saddr6p[4], saddr6p[5], saddr6p[6], saddr6p[7],
600 naddr6p[0], naddr6p[1], naddr6p[2], naddr6p[3],
601 naddr6p[4], naddr6p[5], naddr6p[6], naddr6p[7],
602 &metric, &use, &refcnt, &iflags, iface) != 31) {
603 error_msg_and_die("Unsuported kernel route format\n");
606 ifl = 1; /* parse flags */
607 if (!(iflags & RTF_UP))
609 if (iflags & RTF_GATEWAY)
611 if (iflags & RTF_HOST)
613 if (iflags & RTF_DEFAULT)
615 if (iflags & RTF_ADDRCONF)
617 if (iflags & RTF_CACHE)
621 /* Fetch and resolve the target address. */
622 snprintf(addr6, sizeof(addr6), "%s:%s:%s:%s:%s:%s:%s:%s",
623 addr6p[0], addr6p[1], addr6p[2], addr6p[3],
624 addr6p[4], addr6p[5], addr6p[6], addr6p[7]);
625 inet_pton(AF_INET6, addr6, (struct sockaddr *) &saddr6.sin6_addr);
626 saddr6.sin6_family = AF_INET6;
628 INET6_rresolve(addr6, sizeof(addr6), (struct sockaddr_in6 *) &saddr6,
630 snprintf(addr6, sizeof(addr6), "%s/%d", addr6, prefix_len);
632 /* Fetch and resolve the nexthop address. */
633 snprintf(naddr6, sizeof(naddr6), "%s:%s:%s:%s:%s:%s:%s:%s",
634 naddr6p[0], naddr6p[1], naddr6p[2], naddr6p[3],
635 naddr6p[4], naddr6p[5], naddr6p[6], naddr6p[7]);
636 inet_pton(AF_INET6, naddr6, (struct sockaddr *) &snaddr6.sin6_addr);
637 snaddr6.sin6_family = AF_INET6;
639 INET6_rresolve(naddr6, sizeof(naddr6),
640 (struct sockaddr_in6 *) &snaddr6, numeric);
642 /* Print the info. */
643 printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
644 addr6, naddr6, flags, metric, refcnt, use, iface);
649 int route_main(int argc, char **argv)
654 #ifdef CONFIG_FEATURE_IPV6
658 if (!argv[1] || (argv[1][0] == '-')) {
663 while ((opt = getopt(argc, argv, "A:ne")) > 0) {
672 #ifdef CONFIG_FEATURE_IPV6
673 if (strcmp(optarg, "inet6") == 0)
682 #ifdef CONFIG_FEATURE_IPV6
684 INET6_displayroutes(*argv != NULL);
687 displayroutes(noresolve, extended);
691 if (strcmp(argv[1], "add") == 0)
693 else if (strcmp(argv[1], "del") == 0
694 || strcmp(argv[1], "delete") == 0)
696 else if (strcmp(argv[1], "flush") == 0)
697 what = RTACTION_FLUSH;
702 #ifdef CONFIG_FEATURE_IPV6
704 return INET6_setroute(what, 0, argv + 2);
706 return INET_setroute(what, 0, argv + 2);