1 /* vi: set sw=4 ts=4: */
2 /*
3 * route
4 *
5 * Similar to the standard Unix route, but with only the necessary
6 * parts for AF_INET and AF_INET6
7 *
8 * Bjorn Wesen, Axis Communications AB
9 *
10 * Author of the original route:
11 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
12 * (derived from FvK's 'route.c 1.70 01/04/94')
13 *
14 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
15 *
16 *
17 * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
18 * adjustments by Larry Doolittle <LRDoolittle@lbl.gov>
19 *
20 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
21 */
22 /* 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 //config:config ROUTE
28 //config: bool "route (8.7 kb)"
29 //config: default y
30 //config: help
31 //config: Route displays or manipulates the kernel's IP routing tables.
32
33 //applet:IF_ROUTE(APPLET(route, BB_DIR_SBIN, BB_SUID_DROP))
34
35 //kbuild:lib-$(CONFIG_ROUTE) += route.o
36
37 #include <net/route.h>
38 #include <net/if.h>
39
40 #include "libbb.h"
41 #include "inet_common.h"
42
43
44 #ifndef RTF_UP
45 /* Keep this in sync with /usr/src/linux/include/linux/route.h */
46 #define RTF_UP 0x0001 /* route usable */
47 #define RTF_GATEWAY 0x0002 /* destination is a gateway */
48 #define RTF_HOST 0x0004 /* host entry (net otherwise) */
49 #define RTF_REINSTATE 0x0008 /* reinstate route after tmout */
50 #define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */
51 #define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */
52 #define RTF_MTU 0x0040 /* specific MTU for this route */
53 #ifndef RTF_MSS
54 #define RTF_MSS RTF_MTU /* Compatibility :-( */
55 #endif
56 #define RTF_WINDOW 0x0080 /* per route window clamping */
57 #define RTF_IRTT 0x0100 /* Initial round trip time */
58 #define RTF_REJECT 0x0200 /* Reject route */
59 #define RTF_NONEXTHOP 0x00200000 /* route with no nexthop */
60 #endif
61
62 #if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */
63 #define HAVE_NEW_ADDRT 1
64 #endif
65
66 #if HAVE_NEW_ADDRT
67 #define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
68 #define full_mask(x) (x)
69 #else
70 #define mask_in_addr(x) ((x).rt_genmask)
71 #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
72 #endif
73
74 /* The RTACTION entries must agree with tbl_verb[] below! */
75 #define RTACTION_ADD 1
76 #define RTACTION_DEL 2
77
78 /* For the various tbl_*[] arrays, the 1st byte is return value. */
79
80 #define NET_FLAG 1
81 #define HOST_FLAG 2
82
83 /* We remap '-' to '#' to avoid problems with getopt. */
84 static const char tbl_hash_net_host[] ALIGN1 =
85 "\001#net\0"
86 "\002#host\0"
87 ;
88
89 #define KW_TAKES_ARG 020
90 #define KW_SETS_FLAG 040
91
92 #define KW_IPVx_METRIC 020
93 #define KW_IPVx_NETMASK 021
94 #define KW_IPVx_GATEWAY 022
95 #define KW_IPVx_MSS 023
96 #define KW_IPVx_WINDOW 024
97 #define KW_IPVx_IRTT 025
98 #define KW_IPVx_DEVICE 026
99
100 #define KW_IPVx_FLAG_ONLY 040
101 #define KW_IPVx_REJECT 040
102 #define KW_IPVx_MOD 041
103 #define KW_IPVx_DYN 042
104 #define KW_IPVx_REINSTATE 043
105
106 static const char tbl_ipvx[] ALIGN1 =
107 /* 020 is the "takes an arg" bit */
108 #if HAVE_NEW_ADDRT
109 "\020metric\0"
110 #endif
111 "\021netmask\0"
112 "\022gw\0"
113 "\022gateway\0"
114 "\023mss\0"
115 "\024window\0"
116 #ifdef RTF_IRTT
117 "\025irtt\0"
118 #endif
119 "\026dev\0"
120 "\026device\0"
121 /* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */
122 #ifdef RTF_REJECT
123 "\040reject\0"
124 #endif
125 "\041mod\0"
126 "\042dyn\0"
127 "\043reinstate\0"
128 ;
129
130 static const uint16_t flags_ipvx[] ALIGN2 = { /* MUST match tbl_ipvx[] values above. */
131 #ifdef RTF_REJECT
132 RTF_REJECT,
133 #endif
134 RTF_MODIFIED,
135 RTF_DYNAMIC,
136 RTF_REINSTATE
137 };
138
kw_lookup(const char * kwtbl,char *** pargs)139 static int kw_lookup(const char *kwtbl, char ***pargs)
140 {
141 if (**pargs) {
142 do {
143 if (strcmp(kwtbl + 1, **pargs) == 0) { /* Found a match. */
144 *pargs += 1;
145 if (kwtbl[0] & KW_TAKES_ARG) {
146 if (!**pargs) { /* No more args! */
147 bb_show_usage();
148 }
149 *pargs += 1; /* Calling routine will use args[-1]. */
150 }
151 return kwtbl[0];
152 }
153 kwtbl += strlen(kwtbl) + 1;
154 } while (*kwtbl);
155 }
156 return 0;
157 }
158
159 /* Add or delete a route, depending on action. */
160
INET_setroute(int action,char ** args)161 static NOINLINE void INET_setroute(int action, char **args)
162 {
163 /* char buffer instead of bona-fide struct avoids aliasing warning */
164 char rt_buf[sizeof(struct rtentry)];
165 struct rtentry *const rt = (void *)rt_buf;
166
167 const char *netmask = NULL;
168 int skfd, isnet, xflag;
169
170 /* Grab the -net or -host options. Remember they were transformed. */
171 xflag = kw_lookup(tbl_hash_net_host, &args);
172
173 /* If we did grab -net or -host, make sure we still have an arg left. */
174 if (*args == NULL) {
175 bb_show_usage();
176 }
177
178 /* Clean out the RTREQ structure. */
179 memset(rt, 0, sizeof(*rt));
180
181 {
182 const char *target = *args++;
183 char *prefix;
184
185 /* recognize x.x.x.x/mask format. */
186 prefix = strchr(target, '/');
187 if (prefix) {
188 int prefix_len;
189
190 prefix_len = xatoul_range(prefix+1, 0, 32);
191 mask_in_addr(*rt) = htonl( ~(0xffffffffUL >> prefix_len));
192 *prefix = '\0';
193 #if HAVE_NEW_ADDRT
194 rt->rt_genmask.sa_family = AF_INET;
195 #endif
196 } else {
197 /* Default netmask. */
198 netmask = "default";
199 }
200 /* Prefer hostname lookup if -host flag (xflag==1) was given. */
201 isnet = INET_resolve(target, (struct sockaddr_in *) &rt->rt_dst,
202 (xflag & HOST_FLAG));
203 if (isnet < 0) {
204 bb_error_msg_and_die("resolving %s", target);
205 }
206 if (prefix) {
207 /* do not destroy prefix for process args */
208 *prefix = '/';
209 }
210 }
211
212 if (xflag) { /* Reinit isnet if -net or -host was specified. */
213 isnet = (xflag & NET_FLAG);
214 }
215
216 /* Fill in the other fields. */
217 rt->rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST));
218
219 while (*args) {
220 int k = kw_lookup(tbl_ipvx, &args);
221 const char *args_m1 = args[-1];
222
223 if (k & KW_IPVx_FLAG_ONLY) {
224 rt->rt_flags |= flags_ipvx[k & 3];
225 continue;
226 }
227
228 #if HAVE_NEW_ADDRT
229 if (k == KW_IPVx_METRIC) {
230 rt->rt_metric = xatoul(args_m1) + 1;
231 continue;
232 }
233 #endif
234
235 if (k == KW_IPVx_NETMASK) {
236 struct sockaddr mask;
237
238 if (mask_in_addr(*rt)) {
239 bb_show_usage();
240 }
241
242 netmask = args_m1;
243 isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0);
244 if (isnet < 0) {
245 bb_error_msg_and_die("resolving %s", netmask);
246 }
247 rt->rt_genmask = full_mask(mask);
248 continue;
249 }
250
251 if (k == KW_IPVx_GATEWAY) {
252 if (rt->rt_flags & RTF_GATEWAY) {
253 bb_show_usage();
254 }
255
256 isnet = INET_resolve(args_m1,
257 (struct sockaddr_in *) &rt->rt_gateway, 1);
258 rt->rt_flags |= RTF_GATEWAY;
259
260 if (isnet) {
261 if (isnet < 0) {
262 bb_error_msg_and_die("resolving %s", args_m1);
263 }
264 bb_error_msg_and_die("gateway %s is a NETWORK", args_m1);
265 }
266 continue;
267 }
268
269 if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */
270 rt->rt_flags |= RTF_MSS;
271 rt->rt_mss = xatoul_range(args_m1, 64, 32768);
272 continue;
273 }
274
275 if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */
276 rt->rt_flags |= RTF_WINDOW;
277 rt->rt_window = xatoul_range(args_m1, 128, INT_MAX);
278 continue;
279 }
280
281 #ifdef RTF_IRTT
282 if (k == KW_IPVx_IRTT) {
283 rt->rt_flags |= RTF_IRTT;
284 rt->rt_irtt = xatoul(args_m1);
285 rt->rt_irtt *= (bb_clk_tck() / 100); /* FIXME */
286 #if 0 /* FIXME: do we need to check anything of this? */
287 if (rt->rt_irtt < 1 || rt->rt_irtt > (120 * HZ)) {
288 bb_error_msg_and_die("bad irtt");
289 }
290 #endif
291 continue;
292 }
293 #endif
294
295 /* Device is special in that it can be the last arg specified
296 * and doesn't require the dev/device keyword in that case. */
297 if (!rt->rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
298 /* Don't use args_m1 here since args may have changed! */
299 rt->rt_dev = args[-1];
300 continue;
301 }
302
303 /* Nothing matched. */
304 bb_show_usage();
305 }
306
307 #ifdef RTF_REJECT
308 if ((rt->rt_flags & RTF_REJECT) && !rt->rt_dev) {
309 rt->rt_dev = (char*)"lo";
310 }
311 #endif
312
313 /* sanity checks.. */
314 if (mask_in_addr(*rt)) {
315 uint32_t mask = mask_in_addr(*rt);
316
317 mask = ~ntohl(mask);
318 if ((rt->rt_flags & RTF_HOST) && mask != 0xffffffff) {
319 bb_error_msg_and_die("netmask %.8x and host route conflict",
320 (unsigned int) mask);
321 }
322 if (mask & (mask + 1)) {
323 bb_error_msg_and_die("bogus netmask %s", netmask);
324 }
325 mask = ((struct sockaddr_in *) &rt->rt_dst)->sin_addr.s_addr;
326 if (mask & ~(uint32_t)mask_in_addr(*rt)) {
327 bb_simple_error_msg_and_die("netmask and route address conflict");
328 }
329 }
330
331 /* Fill out netmask if still unset */
332 if ((action == RTACTION_ADD) && (rt->rt_flags & RTF_HOST)) {
333 mask_in_addr(*rt) = 0xffffffff;
334 }
335
336 /* Create a socket to the INET kernel. */
337 skfd = xsocket(AF_INET, SOCK_DGRAM, 0);
338
339 if (action == RTACTION_ADD)
340 xioctl(skfd, SIOCADDRT, rt);
341 else
342 xioctl(skfd, SIOCDELRT, rt);
343
344 if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
345 }
346
347 #if ENABLE_FEATURE_IPV6
348
INET6_setroute(int action,char ** args)349 static NOINLINE void INET6_setroute(int action, char **args)
350 {
351 struct sockaddr_in6 sa6;
352 struct in6_rtmsg rt;
353 int prefix_len, skfd;
354 const char *devname;
355
356 /* We know args isn't NULL from the check in route_main. */
357 const char *target = *args++;
358
359 if (strcmp(target, "default") == 0) {
360 prefix_len = 0;
361 memset(&sa6, 0, sizeof(sa6));
362 } else {
363 char *cp;
364 cp = strchr(target, '/'); /* Yes... const to non is ok. */
365 if (cp) {
366 *cp = '\0';
367 prefix_len = xatoul_range(cp + 1, 0, 128);
368 } else {
369 prefix_len = 128;
370 }
371 if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) {
372 bb_error_msg_and_die("resolving %s", target);
373 }
374 }
375
376 /* Clean out the RTREQ structure. */
377 memset(&rt, 0, sizeof(rt));
378
379 memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr));
380
381 /* Fill in the other fields. */
382 rt.rtmsg_dst_len = prefix_len;
383 rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP);
384 rt.rtmsg_metric = 1;
385
386 devname = NULL;
387
388 while (*args) {
389 int k = kw_lookup(tbl_ipvx, &args);
390 const char *args_m1 = args[-1];
391
392 if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) {
393 rt.rtmsg_flags |= flags_ipvx[k & 3];
394 continue;
395 }
396
397 if (k == KW_IPVx_METRIC) {
398 rt.rtmsg_metric = xatoul(args_m1);
399 continue;
400 }
401
402 if (k == KW_IPVx_GATEWAY) {
403 if (rt.rtmsg_flags & RTF_GATEWAY) {
404 bb_show_usage();
405 }
406
407 if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) {
408 bb_error_msg_and_die("resolving %s", args_m1);
409 }
410 memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr,
411 sizeof(struct in6_addr));
412 rt.rtmsg_flags |= RTF_GATEWAY;
413 continue;
414 }
415
416 /* Device is special in that it can be the last arg specified
417 * and doesn't require the dev/device keyword in that case. */
418 if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) {
419 /* Don't use args_m1 here since args may have changed! */
420 devname = args[-1];
421 continue;
422 }
423
424 /* Nothing matched. */
425 bb_show_usage();
426 }
427
428 /* Create a socket to the INET6 kernel. */
429 skfd = xsocket(AF_INET6, SOCK_DGRAM, 0);
430
431 rt.rtmsg_ifindex = 0;
432
433 if (devname) {
434 struct ifreq ifr;
435 /*memset(&ifr, 0, sizeof(ifr)); - SIOCGIFINDEX does not need to clear all */
436 strncpy_IFNAMSIZ(ifr.ifr_name, devname);
437 xioctl(skfd, SIOCGIFINDEX, &ifr);
438 rt.rtmsg_ifindex = ifr.ifr_ifindex;
439 }
440
441 /* Tell the kernel to accept this route. */
442 if (action == RTACTION_ADD)
443 xioctl(skfd, SIOCADDRT, &rt);
444 else
445 xioctl(skfd, SIOCDELRT, &rt);
446
447 if (ENABLE_FEATURE_CLEAN_UP) close(skfd);
448 }
449 #endif
450
451 static const
452 IF_NOT_FEATURE_IPV6(uint16_t flagvals[] ALIGN2 = )
453 IF_FEATURE_IPV6(uint32_t flagvals[] ALIGN4 = )
454 { /* Must agree with flagchars[]. */
455 RTF_UP,
456 RTF_GATEWAY,
457 RTF_HOST,
458 RTF_REINSTATE,
459 RTF_DYNAMIC,
460 RTF_MODIFIED,
461 #if ENABLE_FEATURE_IPV6
462 RTF_DEFAULT,
463 RTF_ADDRCONF,
464 RTF_CACHE,
465 RTF_REJECT,
466 RTF_NONEXTHOP, /* this one doesn't fit into 16 bits */
467 #endif
468 };
469 /* Must agree with flagvals[]. */
470 static const char flagchars[] ALIGN1 =
471 "UGHRDM"
472 #if ENABLE_FEATURE_IPV6
473 "DAC!n"
474 #endif
475 ;
476 #define IPV4_MASK (RTF_UP|RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED)
477 #define IPV6_MASK (RTF_UP|RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE|RTF_REJECT|RTF_NONEXTHOP)
478
set_flags(char * flagstr,int flags)479 static void set_flags(char *flagstr, int flags)
480 {
481 int i;
482
483 for (i = 0; (*flagstr = flagchars[i]) != 0; i++) {
484 if (flags & flagvals[i]) {
485 ++flagstr;
486 }
487 }
488 }
489
490 /* also used in netstat */
bb_displayroutes(int noresolve,int netstatfmt)491 void FAST_FUNC bb_displayroutes(int noresolve, int netstatfmt)
492 {
493 char devname[64], flags[16], *sdest, *sgw;
494 unsigned long d, g, m;
495 int r;
496 int flgs, ref, use, metric, mtu, win, ir;
497 struct sockaddr_in s_addr;
498 struct in_addr mask;
499
500 FILE *fp = xfopen_for_read("/proc/net/route");
501
502 printf("Kernel IP routing table\n"
503 "Destination Gateway Genmask Flags %s Iface\n",
504 netstatfmt ? " MSS Window irtt" : "Metric Ref Use");
505
506 /* Skip the first line. */
507 r = fscanf(fp, "%*[^\n]\n");
508 if (r < 0) {
509 /* Empty line, read error, or EOF. Yes, if routing table
510 * is completely empty, /proc/net/route has no header.
511 */
512 goto ERROR;
513 }
514 while (1) {
515 r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n",
516 devname, &d, &g, &flgs, &ref, &use, &metric, &m,
517 &mtu, &win, &ir);
518 if (r != 11) {
519 ERROR:
520 if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
521 break;
522 }
523 bb_simple_perror_msg_and_die(bb_msg_read_error);
524 }
525
526 if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */
527 continue;
528 }
529
530 set_flags(flags, (flgs & IPV4_MASK));
531 #ifdef RTF_REJECT
532 if (flgs & RTF_REJECT) {
533 flags[0] = '!';
534 }
535 #endif
536 memset(&s_addr, 0, sizeof(struct sockaddr_in));
537 s_addr.sin_family = AF_INET;
538 s_addr.sin_addr.s_addr = d;
539 sdest = INET_rresolve(&s_addr, (noresolve | 0x8000), m); /* 'default' instead of '*' */
540 s_addr.sin_addr.s_addr = g;
541 sgw = INET_rresolve(&s_addr, (noresolve | 0x4000), m); /* Host instead of net */
542 mask.s_addr = m;
543 /* "%15.15s" truncates hostnames, do we really want that? */
544 printf("%-15.15s %-15.15s %-16s%-6s", sdest, sgw, inet_ntoa(mask), flags);
545 free(sdest);
546 free(sgw);
547 if (netstatfmt) {
548 printf("%5d %-5d %6d %s\n", mtu, win, ir, devname);
549 } else {
550 printf("%-6d %-2d %7d %s\n", metric, ref, use, devname);
551 }
552 }
553 fclose(fp);
554 }
555
556 #if ENABLE_FEATURE_IPV6
557
INET6_displayroutes(void)558 static void INET6_displayroutes(void)
559 {
560 char addr6[128], *naddr6;
561 /* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses.
562 * We read the non-delimited strings into the tail of the buffer
563 * using fscanf and then modify the buffer by shifting forward
564 * while inserting ':'s and the nul terminator for the first string.
565 * Hence the strings are at addr6x and addr6x+40. This generates
566 * _much_ less code than the previous (upstream) approach. */
567 char addr6x[80];
568 char iface[16], flags[16];
569 int iflags, metric, refcnt, use, prefix_len, slen;
570 struct sockaddr_in6 snaddr6;
571
572 FILE *fp = xfopen_for_read("/proc/net/ipv6_route");
573
574 printf("Kernel IPv6 routing table\n%-44s%-40s"
575 "Flags Metric Ref Use Iface\n",
576 "Destination", "Next Hop");
577
578 while (1) {
579 int r;
580 r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n",
581 addr6x+14, &prefix_len, &slen, addr6x+40+7,
582 &metric, &refcnt, &use, &iflags, iface);
583 if (r != 9) {
584 if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */
585 break;
586 }
587 ERROR:
588 bb_simple_perror_msg_and_die(bb_msg_read_error);
589 }
590
591 /* Do the addr6x shift-and-insert changes to ':'-delimit addresses.
592 * For now, always do this to validate the proc route format, even
593 * if the interface is down. */
594 {
595 int i = 0;
596 char *p = addr6x+14;
597
598 do {
599 if (!*p) {
600 if (i == 40) { /* nul terminator for 1st address? */
601 addr6x[39] = 0; /* Fixup... need 0 instead of ':'. */
602 ++p; /* Skip and continue. */
603 continue;
604 }
605 goto ERROR;
606 }
607 addr6x[i++] = *p++;
608 if (!((i+1) % 5)) {
609 addr6x[i++] = ':';
610 }
611 } while (i < 40+28+7);
612 }
613
614 set_flags(flags, (iflags & IPV6_MASK));
615
616 r = 0;
617 while (1) {
618 memset(&snaddr6, 0, sizeof(snaddr6));
619 inet_pton(AF_INET6, addr6x + r,
620 (struct sockaddr *) &snaddr6.sin6_addr);
621 snaddr6.sin6_family = AF_INET6;
622 naddr6 = INET6_rresolve((struct sockaddr_in6 *) &snaddr6,
623 0x0fff /* Apparently, upstream never resolves. */
624 );
625 if (!r) { /* 1st pass */
626 snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len);
627 r += 40;
628 free(naddr6);
629 } else { /* 2nd pass */
630 /* Print the info. */
631 printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
632 addr6, naddr6, flags, metric, refcnt, use, iface);
633 free(naddr6);
634 break;
635 }
636 }
637 }
638 fclose(fp);
639 }
640
641 #endif
642
643 //usage:#define route_trivial_usage
644 ///////: "[-ne]"IF_FEATURE_IPV6(" [-A inet[6]]")" [{add|del|delete} [-net|-host] TARGET [netmask MASK] [gw GATEWAY] [metric N] [mss BYTES] [window BYTES] [irtt MSEC] [reject] [mod] [dyn] [reinstate] [[dev] IFACE]]"
645 ///////too wordy
646 //usage: "[-ne]"IF_FEATURE_IPV6(" [-A inet[6]]")" [{add|del} [-net|-host] TARGET [netmask MASK]\n"
647 //usage: " [gw GATEWAY] [metric N] [mss BYTES] [window BYTES] [reject] [IFACE]]"
648 //usage:#define route_full_usage "\n\n"
649 //usage: "Show or edit kernel routing tables\n"
650 //usage: "\n -n Don't resolve names"
651 //usage: "\n -e Display other/more information"
652 //usage: "\n -A inet" IF_FEATURE_IPV6("[6]") " Select address family"
653
654 #define ROUTE_OPT_A 0x01
655 #define ROUTE_OPT_n 0x02
656 #define ROUTE_OPT_e 0x04
657 #define ROUTE_OPT_INET6 0x08 /* Not an actual option. See below. */
658
659 /* 1st byte is return value, matches RTACTION_* code */
660 static const char tbl_verb[] ALIGN1 =
661 "\001add\0"
662 "\002del\0"
663 "\002delete\0"
664 ;
665
666 int route_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
route_main(int argc UNUSED_PARAM,char ** argv)667 int route_main(int argc UNUSED_PARAM, char **argv)
668 {
669 unsigned opt;
670 int what;
671 char *family;
672 char **p;
673
674 /* First, remap '-net' and '-host' to avoid getopt problems. */
675 p = argv;
676 while (*++p) {
677 if (strcmp(*p, "-net") == 0 || strcmp(*p, "-host") == 0) {
678 p[0][0] = '#';
679 }
680 }
681
682 opt = getopt32(argv, "A:ne", &family);
683
684 if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) {
685 #if ENABLE_FEATURE_IPV6
686 if (strcmp(family, "inet6") == 0) {
687 opt |= ROUTE_OPT_INET6; /* Set flag for ipv6. */
688 } else
689 #endif
690 bb_show_usage();
691 }
692
693 argv += optind;
694
695 /* No more args means display the routing table. */
696 if (!*argv) {
697 int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0;
698 #if ENABLE_FEATURE_IPV6
699 if (opt & ROUTE_OPT_INET6)
700 INET6_displayroutes();
701 else
702 #endif
703 bb_displayroutes(noresolve, opt & ROUTE_OPT_e);
704
705 fflush_stdout_and_exit(EXIT_SUCCESS);
706 }
707
708 /* Check verb. At the moment, must be add, del, or delete. */
709 what = kw_lookup(tbl_verb, &argv);
710 if (!what || !*argv) { /* Unknown verb or no more args. */
711 bb_show_usage();
712 }
713
714 #if ENABLE_FEATURE_IPV6
715 if (opt & ROUTE_OPT_INET6)
716 INET6_setroute(what, argv);
717 else
718 #endif
719 INET_setroute(what, argv);
720
721 return EXIT_SUCCESS;
722 }
723