blob: 857424c3bdc904281848a7caa273d1dd86b475e3 [file] [log] [blame]
Bernhard Reutner-Fischerdac7ff12006-04-12 17:55:51 +00001/* vi: set sw=4 ts=4: */
Eric Andersenec455952001-02-14 08:11:27 +00002/* route
3 *
4 * Similar to the standard Unix route, but with only the necessary
Eric Andersen51b8bd62002-07-03 11:46:38 +00005 * parts for AF_INET and AF_INET6
Eric Andersenec455952001-02-14 08:11:27 +00006 *
7 * Bjorn Wesen, Axis Communications AB
8 *
Eric Andersenb9408502001-09-05 19:32:00 +00009 * Author of the original route:
Eric Andersenec455952001-02-14 08:11:27 +000010 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
11 * (derived from FvK's 'route.c 1.70 01/04/94')
12 *
Bernhard Reutner-Fischerdac7ff12006-04-12 17:55:51 +000013 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Eric Andersenec455952001-02-14 08:11:27 +000014 *
Eric Andersenec455952001-02-14 08:11:27 +000015 *
Eric Andersen68be2ab2001-02-14 19:26:39 +000016 * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
Eric Andersen26d53eb2001-03-07 06:33:01 +000017 * adjustments by Larry Doolittle <LRDoolittle@lbl.gov>
Eric Andersen51b8bd62002-07-03 11:46:38 +000018 *
19 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
Eric Andersenec455952001-02-14 08:11:27 +000020 */
21
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000022/* 2004/03/09 Manuel Novoa III <mjn3@codepoet.org>
23 *
24 * Rewritten to fix several bugs, add additional error checking, and
25 * remove ridiculous amounts of bloat.
26 */
27
Rob Landleyd921b2e2006-08-03 15:41:12 +000028#include <net/route.h>
29#include <net/if.h>
30
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000031#include "libbb.h"
32#include "inet_common.h"
33
Eric Andersen51b8bd62002-07-03 11:46:38 +000034
Eric Andersen863a3e12001-08-27 17:57:27 +000035#ifndef RTF_UP
36/* Keep this in sync with /usr/src/linux/include/linux/route.h */
Glenn L McGrath7c58e9b2002-08-22 18:24:43 +000037#define RTF_UP 0x0001 /* route usable */
38#define RTF_GATEWAY 0x0002 /* destination is a gateway */
39#define RTF_HOST 0x0004 /* host entry (net otherwise) */
40#define RTF_REINSTATE 0x0008 /* reinstate route after tmout */
41#define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */
42#define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */
43#define RTF_MTU 0x0040 /* specific MTU for this route */
Eric Andersen863a3e12001-08-27 17:57:27 +000044#ifndef RTF_MSS
Glenn L McGrath7c58e9b2002-08-22 18:24:43 +000045#define RTF_MSS RTF_MTU /* Compatibility :-( */
Eric Andersen863a3e12001-08-27 17:57:27 +000046#endif
Glenn L McGrath7c58e9b2002-08-22 18:24:43 +000047#define RTF_WINDOW 0x0080 /* per route window clamping */
48#define RTF_IRTT 0x0100 /* Initial round trip time */
49#define RTF_REJECT 0x0200 /* Reject route */
Eric Andersen863a3e12001-08-27 17:57:27 +000050#endif
51
Denis Vlasenkoff131b92007-04-10 15:42:06 +000052#if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000053#define HAVE_NEW_ADDRT 1
54#endif
55
56#if HAVE_NEW_ADDRT
57#define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
58#define full_mask(x) (x)
59#else
60#define mask_in_addr(x) ((x).rt_genmask)
61#define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
62#endif
63
64/* The RTACTION entries must agree with tbl_verb[] below! */
Denis Vlasenko703e2022007-01-22 14:12:08 +000065#define RTACTION_ADD 1
66#define RTACTION_DEL 2
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000067
68/* For the various tbl_*[] arrays, the 1st byte is the offset to
69 * the next entry and the 2nd byte is return value. */
70
Denis Vlasenko703e2022007-01-22 14:12:08 +000071#define NET_FLAG 1
72#define HOST_FLAG 2
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000073
74/* We remap '-' to '#' to avoid problems with getopt. */
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000075static const char tbl_hash_net_host[] ALIGN1 =
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000076 "\007\001#net\0"
Tim Rikerc1ef7bd2006-01-25 00:08:53 +000077/* "\010\002#host\0" */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000078 "\007\002#host" /* Since last, we can save a byte. */
79;
80
Denis Vlasenko703e2022007-01-22 14:12:08 +000081#define KW_TAKES_ARG 020
82#define KW_SETS_FLAG 040
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000083
Denis Vlasenko703e2022007-01-22 14:12:08 +000084#define KW_IPVx_METRIC 020
85#define KW_IPVx_NETMASK 021
86#define KW_IPVx_GATEWAY 022
87#define KW_IPVx_MSS 023
88#define KW_IPVx_WINDOW 024
89#define KW_IPVx_IRTT 025
90#define KW_IPVx_DEVICE 026
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000091
Denis Vlasenko703e2022007-01-22 14:12:08 +000092#define KW_IPVx_FLAG_ONLY 040
93#define KW_IPVx_REJECT 040
94#define KW_IPVx_MOD 041
95#define KW_IPVx_DYN 042
96#define KW_IPVx_REINSTATE 043
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000097
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000098static const char tbl_ipvx[] ALIGN1 =
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +000099 /* 020 is the "takes an arg" bit */
100#if HAVE_NEW_ADDRT
101 "\011\020metric\0"
102#endif
103 "\012\021netmask\0"
104 "\005\022gw\0"
105 "\012\022gateway\0"
106 "\006\023mss\0"
107 "\011\024window\0"
108#ifdef RTF_IRTT
109 "\007\025irtt\0"
110#endif
111 "\006\026dev\0"
112 "\011\026device\0"
113 /* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */
114#ifdef RTF_REJECT
115 "\011\040reject\0"
116#endif
117 "\006\041mod\0"
118 "\006\042dyn\0"
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000119/* "\014\043reinstate\0" */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000120 "\013\043reinstate" /* Since last, we can save a byte. */
121;
122
123static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */
124#ifdef RTF_REJECT
125 RTF_REJECT,
126#endif
127 RTF_MODIFIED,
128 RTF_DYNAMIC,
129 RTF_REINSTATE
130};
131
132static int kw_lookup(const char *kwtbl, char ***pargs)
133{
134 if (**pargs) {
135 do {
136 if (strcmp(kwtbl+2, **pargs) == 0) { /* Found a match. */
137 *pargs += 1;
138 if (kwtbl[1] & KW_TAKES_ARG) {
139 if (!**pargs) { /* No more args! */
140 bb_show_usage();
141 }
142 *pargs += 1; /* Calling routine will use args[-1]. */
143 }
144 return kwtbl[1];
145 }
146 kwtbl += *kwtbl;
147 } while (*kwtbl);
148 }
149 return 0;
150}
151
152/* Add or delete a route, depending on action. */
153
154static void INET_setroute(int action, char **args)
155{
156 struct rtentry rt;
Eric Andersen0cb6f352006-01-30 22:30:41 +0000157 const char *netmask = NULL;
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000158 int skfd, isnet, xflag;
159
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000160 /* Grab the -net or -host options. Remember they were transformed. */
161 xflag = kw_lookup(tbl_hash_net_host, &args);
162
163 /* If we did grab -net or -host, make sure we still have an arg left. */
164 if (*args == NULL) {
165 bb_show_usage();
166 }
167
168 /* Clean out the RTREQ structure. */
Denis Vlasenko703e2022007-01-22 14:12:08 +0000169 memset(&rt, 0, sizeof(rt));
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000170
171 {
172 const char *target = *args++;
"Vladimir N. Oleynik"5775aa22006-01-25 16:17:58 +0000173 char *prefix;
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000174
"Vladimir N. Oleynik"5775aa22006-01-25 16:17:58 +0000175 /* recognize x.x.x.x/mask format. */
176 prefix = strchr(target, '/');
Denis Vlasenko51742f42007-04-12 00:32:05 +0000177 if (prefix) {
"Vladimir N. Oleynik"5775aa22006-01-25 16:17:58 +0000178 int prefix_len;
179
Denis Vlasenko13858992006-10-08 12:49:22 +0000180 prefix_len = xatoul_range(prefix+1, 0, 32);
"Vladimir N. Oleynik"5775aa22006-01-25 16:17:58 +0000181 mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len));
182 *prefix = '\0';
183#if HAVE_NEW_ADDRT
184 rt.rt_genmask.sa_family = AF_INET;
185#endif
186 } else {
187 /* Default netmask. */
Denis Vlasenko7ca39212006-11-21 20:34:21 +0000188 netmask = bb_str_default;
"Vladimir N. Oleynik"5775aa22006-01-25 16:17:58 +0000189 }
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000190 /* Prefer hostname lookup is -host flag (xflag==1) was given. */
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000191 isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst,
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000192 (xflag & HOST_FLAG));
193 if (isnet < 0) {
194 bb_error_msg_and_die("resolving %s", target);
195 }
Denis Vlasenko51742f42007-04-12 00:32:05 +0000196 if (prefix) {
"Vladimir N. Oleynik"5775aa22006-01-25 16:17:58 +0000197 /* do not destroy prefix for process args */
198 *prefix = '/';
199 }
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000200 }
201
202 if (xflag) { /* Reinit isnet if -net or -host was specified. */
203 isnet = (xflag & NET_FLAG);
204 }
205
206 /* Fill in the other fields. */
207 rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
208
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000209 while (*args) {
210 int k = kw_lookup(tbl_ipvx, &args);
211 const char *args_m1 = args[-1];
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000212
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000213 if (k & KW_IPVx_FLAG_ONLY) {
214 rt.rt_flags |= flags_ipvx[k & 3];
215 continue;
216 }
217
218#if HAVE_NEW_ADDRT
219 if (k == KW_IPVx_METRIC) {
Denis Vlasenko13858992006-10-08 12:49:22 +0000220 rt.rt_metric = xatoul(args_m1) + 1;
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000221 continue;
222 }
223#endif
224
225 if (k == KW_IPVx_NETMASK) {
226 struct sockaddr mask;
227
228 if (mask_in_addr(rt)) {
229 bb_show_usage();
230 }
231
232 netmask = args_m1;
233 isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0);
234 if (isnet < 0) {
235 bb_error_msg_and_die("resolving %s", netmask);
236 }
237 rt.rt_genmask = full_mask(mask);
238 continue;
239 }
240
241 if (k == KW_IPVx_GATEWAY) {
242 if (rt.rt_flags & RTF_GATEWAY) {
243 bb_show_usage();
244 }
245
246 isnet = INET_resolve(args_m1,
247 (struct sockaddr_in *) &rt.rt_gateway, 1);
248 rt.rt_flags |= RTF_GATEWAY;
249
250 if (isnet) {
251 if (isnet < 0) {
252 bb_error_msg_and_die("resolving %s", args_m1);
253 }
254 bb_error_msg_and_die("gateway %s is a NETWORK", args_m1);
255 }
256 continue;
257 }
258
259 if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */
260 rt.rt_flags |= RTF_MSS;
Denis Vlasenko13858992006-10-08 12:49:22 +0000261 rt.rt_mss = xatoul_range(args_m1, 64, 32768);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000262 continue;
263 }
264
265 if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */
266 rt.rt_flags |= RTF_WINDOW;
Denis Vlasenko13858992006-10-08 12:49:22 +0000267 rt.rt_window = xatoul_range(args_m1, 128, INT_MAX);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000268 continue;
269 }
270
271#ifdef RTF_IRTT
272 if (k == KW_IPVx_IRTT) {
273 rt.rt_flags |= RTF_IRTT;
Denis Vlasenko13858992006-10-08 12:49:22 +0000274 rt.rt_irtt = xatoul(args_m1);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000275 rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 100); /* FIXME */
276#if 0 /* FIXME: do we need to check anything of this? */
277 if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) {
278 bb_error_msg_and_die("bad irtt");
279 }
280#endif
281 continue;
282 }
283#endif
284
285 /* Device is special in that it can be the last arg specified
286 * and doesn't requre the dev/device keyword in that case. */
287 if (!rt.rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
Manuel Novoa III 539fa952004-03-19 23:27:08 +0000288 /* Don't use args_m1 here since args may have changed! */
289 rt.rt_dev = args[-1];
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000290 continue;
291 }
292
293 /* Nothing matched. */
294 bb_show_usage();
295 }
296
297#ifdef RTF_REJECT
298 if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) {
Denis Vlasenkob6aae0f2007-01-29 22:51:25 +0000299 rt.rt_dev = (char*)"lo";
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000300 }
301#endif
302
303 /* sanity checks.. */
304 if (mask_in_addr(rt)) {
305 unsigned long mask = mask_in_addr(rt);
306
307 mask = ~ntohl(mask);
308 if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) {
309 bb_error_msg_and_die("netmask %.8x and host route conflict",
310 (unsigned int) mask);
311 }
312 if (mask & (mask + 1)) {
313 bb_error_msg_and_die("bogus netmask %s", netmask);
314 }
315 mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr;
316 if (mask & ~mask_in_addr(rt)) {
317 bb_error_msg_and_die("netmask and route address conflict");
318 }
319 }
320
321 /* Fill out netmask if still unset */
322 if ((action == RTACTION_ADD) && (rt.rt_flags & RTF_HOST)) {
323 mask_in_addr(rt) = 0xffffffff;
324 }
325
326 /* Create a socket to the INET kernel. */
Rob Landleyd921b2e2006-08-03 15:41:12 +0000327 skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000328
Denis Vlasenkofb79a2e2007-07-14 22:07:14 +0000329 if (action == RTACTION_ADD)
330 xioctl(skfd, SIOCADDRT, &rt);
331 else
332 xioctl(skfd, SIOCDELRT, &rt);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000333
Rob Landley64175642005-08-22 15:57:50 +0000334 if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000335}
336
Denis Vlasenko703e2022007-01-22 14:12:08 +0000337#if ENABLE_FEATURE_IPV6
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000338
339static void INET6_setroute(int action, char **args)
340{
341 struct sockaddr_in6 sa6;
342 struct in6_rtmsg rt;
343 int prefix_len, skfd;
344 const char *devname;
345
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000346 /* We know args isn't NULL from the check in route_main. */
347 const char *target = *args++;
348
Denis Vlasenko7ca39212006-11-21 20:34:21 +0000349 if (strcmp(target, bb_str_default) == 0) {
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000350 prefix_len = 0;
351 memset(&sa6, 0, sizeof(sa6));
352 } else {
353 char *cp;
Denis Vlasenko1bec1b92007-11-06 02:23:39 +0000354 cp = strchr(target, '/'); /* Yes... const to non is ok. */
355 if (cp) {
356 *cp = '\0';
357 prefix_len = xatoul_range(cp + 1, 0, 128);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000358 } else {
359 prefix_len = 128;
360 }
361 if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
362 bb_error_msg_and_die("resolving %s", target);
363 }
364 }
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000365
366 /* Clean out the RTREQ structure. */
Denis Vlasenko703e2022007-01-22 14:12:08 +0000367 memset(&rt, 0, sizeof(rt));
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000368
369 memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
370
371 /* Fill in the other fields. */
372 rt.rtmsg_dst_len = prefix_len;
373 rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP);
374 rt.rtmsg_metric = 1;
375
376 devname = NULL;
377
378 while (*args) {
379 int k = kw_lookup(tbl_ipvx, &args);
380 const char *args_m1 = args[-1];
381
382 if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) {
383 rt.rtmsg_flags |= flags_ipvx[k & 3];
384 continue;
385 }
386
387 if (k == KW_IPVx_METRIC) {
Denis Vlasenko13858992006-10-08 12:49:22 +0000388 rt.rtmsg_metric = xatoul(args_m1);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000389 continue;
390 }
391
392 if (k == KW_IPVx_GATEWAY) {
393 if (rt.rtmsg_flags & RTF_GATEWAY) {
394 bb_show_usage();
395 }
396
397 if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) {
398 bb_error_msg_and_die("resolving %s", args_m1);
399 }
400 memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
401 sizeof(struct in6_addr));
402 rt.rtmsg_flags |= RTF_GATEWAY;
403 continue;
404 }
405
406 /* Device is special in that it can be the last arg specified
407 * and doesn't requre the dev/device keyword in that case. */
408 if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
Manuel Novoa III 539fa952004-03-19 23:27:08 +0000409 /* Don't use args_m1 here since args may have changed! */
410 devname = args[-1];
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000411 continue;
412 }
413
414 /* Nothing matched. */
415 bb_show_usage();
416 }
417
418 /* Create a socket to the INET6 kernel. */
Rob Landleyd921b2e2006-08-03 15:41:12 +0000419 skfd = xsocket(AF_INET6, SOCK_DGRAM, 0);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000420
421 rt.rtmsg_ifindex = 0;
422
423 if (devname) {
424 struct ifreq ifr;
425 memset(&ifr, 0, sizeof(ifr));
Denis Vlasenko229b3d22006-11-27 23:44:57 +0000426 strncpy(ifr.ifr_name, devname, sizeof(ifr.ifr_name));
Denis Vlasenkofb79a2e2007-07-14 22:07:14 +0000427 xioctl(skfd, SIOGIFINDEX, &ifr);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000428 rt.rtmsg_ifindex = ifr.ifr_ifindex;
429 }
430
431 /* Tell the kernel to accept this route. */
Denis Vlasenkofb79a2e2007-07-14 22:07:14 +0000432 if (action == RTACTION_ADD)
433 xioctl(skfd, SIOCADDRT, &rt);
434 else
435 xioctl(skfd, SIOCDELRT, &rt);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000436
Rob Landley64175642005-08-22 15:57:50 +0000437 if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000438}
439#endif
440
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000441static const unsigned flagvals[] = { /* Must agree with flagchars[]. */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000442 RTF_GATEWAY,
443 RTF_HOST,
444 RTF_REINSTATE,
445 RTF_DYNAMIC,
446 RTF_MODIFIED,
Denis Vlasenko703e2022007-01-22 14:12:08 +0000447#if ENABLE_FEATURE_IPV6
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000448 RTF_DEFAULT,
449 RTF_ADDRCONF,
450 RTF_CACHE
451#endif
452};
453
454#define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
455#define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE)
456
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000457/* Must agree with flagvals[]. */
458static const char flagchars[] ALIGN1 =
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000459 "GHRDM"
Denis Vlasenko703e2022007-01-22 14:12:08 +0000460#if ENABLE_FEATURE_IPV6
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000461 "DAC"
462#endif
463;
464
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000465static void set_flags(char *flagstr, int flags)
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000466{
467 int i;
468
469 *flagstr++ = 'U';
470
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000471 for (i = 0; (*flagstr = flagchars[i]) != 0; i++) {
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000472 if (flags & flagvals[i]) {
473 ++flagstr;
474 }
475 }
476}
477
Eric Andersen14f5c8d2005-04-16 19:39:00 +0000478/* also used in netstat */
Denis Vlasenko703e2022007-01-22 14:12:08 +0000479void bb_displayroutes(int noresolve, int netstatfmt)
Eric Andersen68be2ab2001-02-14 19:26:39 +0000480{
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000481 char devname[64], flags[16], *sdest, *sgw;
Denis Vlasenko87468852007-04-13 23:22:00 +0000482 unsigned long d, g, m;
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000483 int flgs, ref, use, metric, mtu, win, ir;
484 struct sockaddr_in s_addr;
485 struct in_addr mask;
Eric Andersen68be2ab2001-02-14 19:26:39 +0000486
Rob Landleyd921b2e2006-08-03 15:41:12 +0000487 FILE *fp = xfopen("/proc/net/route", "r");
Eric Andersen68be2ab2001-02-14 19:26:39 +0000488
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000489 printf("Kernel IP routing table\n"
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000490 "Destination Gateway Genmask Flags %s Iface\n",
491 netstatfmt ? " MSS Window irtt" : "Metric Ref Use");
Eric Andersencd8c4362001-11-10 11:22:46 +0000492
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000493 if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */
494 goto ERROR; /* Empty or missing line, or read error. */
495 }
496 while (1) {
497 int r;
498 r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
499 devname, &d, &g, &flgs, &ref, &use, &metric, &m,
500 &mtu, &win, &ir);
501 if (r != 11) {
502 if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
503 break;
Eric Andersen68be2ab2001-02-14 19:26:39 +0000504 }
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000505 ERROR:
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000506 bb_error_msg_and_die("fscanf");
Glenn L McGrath7c58e9b2002-08-22 18:24:43 +0000507 }
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000508
509 if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */
510 continue;
511 }
512
513 set_flags(flags, (flgs & IPV4_MASK));
514#ifdef RTF_REJECT
515 if (flgs & RTF_REJECT) {
516 flags[0] = '!';
517 }
518#endif
519
520 memset(&s_addr, 0, sizeof(struct sockaddr_in));
521 s_addr.sin_family = AF_INET;
522 s_addr.sin_addr.s_addr = d;
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000523 sdest = INET_rresolve(&s_addr, (noresolve | 0x8000), m); /* 'default' instead of '*' */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000524 s_addr.sin_addr.s_addr = g;
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000525 sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000526 mask.s_addr = m;
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000527 /* "%15.15s" truncates hostnames, do we really want that? */
528 printf("%-15.15s %-15.15s %-16s%-6s", sdest, sgw, inet_ntoa(mask), flags);
529 free(sdest);
530 free(sgw);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000531 if (netstatfmt) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000532 printf("%5d %-5d %6d %s\n", mtu, win, ir, devname);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000533 } else {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000534 printf("%-6d %-2d %7d %s\n", metric, ref, use, devname);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000535 }
Glenn L McGrath7c58e9b2002-08-22 18:24:43 +0000536 }
Eric Andersen68be2ab2001-02-14 19:26:39 +0000537}
538
Denis Vlasenko703e2022007-01-22 14:12:08 +0000539#if ENABLE_FEATURE_IPV6
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000540
Denis Vlasenko68404f12008-03-17 09:00:54 +0000541static void INET6_displayroutes(void)
Eric Andersen51b8bd62002-07-03 11:46:38 +0000542{
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000543 char addr6[128], *naddr6;
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000544 /* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses.
545 * We read the non-delimited strings into the tail of the buffer
546 * using fscanf and then modify the buffer by shifting forward
547 * while inserting ':'s and the nul terminator for the first string.
548 * Hence the strings are at addr6x and addr6x+40. This generates
549 * _much_ less code than the previous (upstream) approach. */
550 char addr6x[80];
551 char iface[16], flags[16];
Eric Andersen51b8bd62002-07-03 11:46:38 +0000552 int iflags, metric, refcnt, use, prefix_len, slen;
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000553 struct sockaddr_in6 snaddr6;
Eric Andersen51b8bd62002-07-03 11:46:38 +0000554
Rob Landleyd921b2e2006-08-03 15:41:12 +0000555 FILE *fp = xfopen("/proc/net/ipv6_route", "r");
Eric Andersen51b8bd62002-07-03 11:46:38 +0000556
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000557 printf("Kernel IPv6 routing table\n%-44s%-40s"
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000558 "Flags Metric Ref Use Iface\n",
559 "Destination", "Next Hop");
Glenn L McGrath7c58e9b2002-08-22 18:24:43 +0000560
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000561 while (1) {
562 int r;
563 r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n",
564 addr6x+14, &prefix_len, &slen, addr6x+40+7,
565 &metric, &use, &refcnt, &iflags, iface);
566 if (r != 9) {
567 if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
568 break;
569 }
Denis Vlasenko98ee06d2006-12-31 18:57:37 +0000570 ERROR:
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000571 bb_error_msg_and_die("fscanf");
Eric Andersen51b8bd62002-07-03 11:46:38 +0000572 }
573
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000574 /* Do the addr6x shift-and-insert changes to ':'-delimit addresses.
575 * For now, always do this to validate the proc route format, even
576 * if the interface is down. */
577 {
578 int i = 0;
579 char *p = addr6x+14;
580
581 do {
582 if (!*p) {
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000583 if (i == 40) { /* nul terminator for 1st address? */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000584 addr6x[39] = 0; /* Fixup... need 0 instead of ':'. */
585 ++p; /* Skip and continue. */
586 continue;
587 }
588 goto ERROR;
589 }
590 addr6x[i++] = *p++;
Denis Vlasenko703e2022007-01-22 14:12:08 +0000591 if (!((i+1) % 5)) {
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000592 addr6x[i++] = ':';
593 }
594 } while (i < 40+28+7);
595 }
596
597 if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */
Eric Andersen51b8bd62002-07-03 11:46:38 +0000598 continue;
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000599 }
Eric Andersen51b8bd62002-07-03 11:46:38 +0000600
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000601 set_flags(flags, (iflags & IPV6_MASK));
Eric Andersen51b8bd62002-07-03 11:46:38 +0000602
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000603 r = 0;
604 do {
605 inet_pton(AF_INET6, addr6x + r,
606 (struct sockaddr *) &snaddr6.sin6_addr);
607 snaddr6.sin6_family = AF_INET6;
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000608 naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6,
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000609 0x0fff /* Apparently, upstream never resolves. */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000610 );
Eric Andersen51b8bd62002-07-03 11:46:38 +0000611
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000612 if (!r) { /* 1st pass */
613 snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len);
614 r += 40;
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000615 free(naddr6);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000616 } else { /* 2nd pass */
617 /* Print the info. */
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000618 printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
Denis Vlasenko6d9ea242007-06-19 11:12:46 +0000619 addr6, naddr6, flags, metric, refcnt, use, iface);
620 free(naddr6);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000621 break;
622 }
623 } while (1);
Eric Andersen51b8bd62002-07-03 11:46:38 +0000624 }
625}
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000626
Eric Andersen51b8bd62002-07-03 11:46:38 +0000627#endif
628
Denis Vlasenko703e2022007-01-22 14:12:08 +0000629#define ROUTE_OPT_A 0x01
630#define ROUTE_OPT_n 0x02
631#define ROUTE_OPT_e 0x04
632#define ROUTE_OPT_INET6 0x08 /* Not an actual option. See below. */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000633
634/* 1st byte is offset to next entry offset. 2nd byte is return value. */
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000635/* 2nd byte matches RTACTION_* code */
636static const char tbl_verb[] ALIGN1 =
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000637 "\006\001add\0"
638 "\006\002del\0"
Tim Rikerc1ef7bd2006-01-25 00:08:53 +0000639/* "\011\002delete\0" */
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000640 "\010\002delete" /* Since it's last, we can save a byte. */
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000641;
642
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +0000643int route_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Denis Vlasenko68404f12008-03-17 09:00:54 +0000644int route_main(int argc ATTRIBUTE_UNUSED, char **argv)
Eric Andersenec455952001-02-14 08:11:27 +0000645{
Denis Vlasenko67b23e62006-10-03 21:00:06 +0000646 unsigned opt;
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000647 int what;
648 char *family;
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000649 char **p;
Glenn L McGrath7c58e9b2002-08-22 18:24:43 +0000650
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000651 /* First, remap '-net' and '-host' to avoid getopt problems. */
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000652 p = argv;
653 while (*++p) {
Denis Vlasenko703e2022007-01-22 14:12:08 +0000654 if (strcmp(*p, "-net") == 0 || strcmp(*p, "-host") == 0) {
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000655 p[0][0] = '#';
Robert Griebl820098f2002-05-14 23:03:23 +0000656 }
Eric Andersenc7bda1c2004-03-15 08:29:22 +0000657 }
Glenn L McGrath7c58e9b2002-08-22 18:24:43 +0000658
Denis Vlasenkofe7cd642007-08-18 15:32:12 +0000659 opt = getopt32(argv, "A:ne", &family);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000660
Denis Vlasenko703e2022007-01-22 14:12:08 +0000661 if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) {
662#if ENABLE_FEATURE_IPV6
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000663 if (strcmp(family, "inet6") == 0) {
664 opt |= ROUTE_OPT_INET6; /* Set flag for ipv6. */
665 } else
666#endif
667 bb_show_usage();
668 }
669
670 argv += optind;
671
672 /* No more args means display the routing table. */
673 if (!*argv) {
674 int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0;
Denis Vlasenko703e2022007-01-22 14:12:08 +0000675#if ENABLE_FEATURE_IPV6
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000676 if (opt & ROUTE_OPT_INET6)
Denis Vlasenko68404f12008-03-17 09:00:54 +0000677 INET6_displayroutes();
Eric Andersen51b8bd62002-07-03 11:46:38 +0000678 else
679#endif
Denis Vlasenko703e2022007-01-22 14:12:08 +0000680 bb_displayroutes(noresolve, opt & ROUTE_OPT_e);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000681
Denis Vlasenkof0ed3762006-10-26 23:21:47 +0000682 fflush_stdout_and_exit(EXIT_SUCCESS);
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000683 }
684
685 /* Check verb. At the moment, must be add, del, or delete. */
686 what = kw_lookup(tbl_verb, &argv);
687 if (!what || !*argv) { /* Unknown verb or no more args. */
688 bb_show_usage();
Eric Andersenec455952001-02-14 08:11:27 +0000689 }
690
Denis Vlasenko703e2022007-01-22 14:12:08 +0000691#if ENABLE_FEATURE_IPV6
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000692 if (opt & ROUTE_OPT_INET6)
693 INET6_setroute(what, argv);
694 else
Eric Andersen51b8bd62002-07-03 11:46:38 +0000695#endif
Manuel Novoa III 7d0c5192004-03-10 07:42:38 +0000696 INET_setroute(what, argv);
697
698 return EXIT_SUCCESS;
Eric Andersenec455952001-02-14 08:11:27 +0000699}