1 /* vi: set sw=4 ts=4: */
4 * Similar to the standard Unix route, but with only the necessary
5 * parts for AF_INET and AF_INET6
7 * Bjorn Wesen, Axis Communications AB
9 * Author of the original route:
10 * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
11 * (derived from FvK's 'route.c 1.70 01/04/94')
13 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
16 * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru>
17 * adjustments by Larry Doolittle <LRDoolittle@lbl.gov>
19 * IPV6 support added by Bart Visscher <magick@linux-fan.com>
22 /* 2004/03/09 Manuel Novoa III <mjn3@codepoet.org>
24 * Rewritten to fix several bugs, add additional error checking, and
25 * remove ridiculous amounts of bloat.
28 #include <net/route.h>
32 #include "inet_common.h"
36 /* Keep this in sync with /usr/src/linux/include/linux/route.h */
37 #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 */
45 #define RTF_MSS RTF_MTU /* Compatibility :-( */
47 #define RTF_WINDOW 0x0080 /* per route window clamping */
48 #define RTF_IRTT 0x0100 /* Initial round trip time */
49 #define RTF_REJECT 0x0200 /* Reject route */
52 #if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */
53 #define HAVE_NEW_ADDRT 1
57 #define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr)
58 #define full_mask(x) (x)
60 #define mask_in_addr(x) ((x).rt_genmask)
61 #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr)
64 /* The RTACTION entries must agree with tbl_verb[] below! */
65 #define RTACTION_ADD 1
66 #define RTACTION_DEL 2
68 /* For the various tbl_*[] arrays, the 1st byte is the offset to
69 * the next entry and the 2nd byte is return value. */
74 /* We remap '-' to '#' to avoid problems with getopt. */
75 static const char tbl_hash_net_host
[] ALIGN1
=
77 /* "\010\002#host\0" */
78 "\007\002#host" /* Since last, we can save a byte. */
81 #define KW_TAKES_ARG 020
82 #define KW_SETS_FLAG 040
84 #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
92 #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
98 static const char tbl_ipvx
[] ALIGN1
=
99 /* 020 is the "takes an arg" bit */
113 /* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */
119 /* "\014\043reinstate\0" */
120 "\013\043reinstate" /* Since last, we can save a byte. */
123 static const int flags_ipvx
[] = { /* MUST match tbl_ipvx[] values above. */
132 static int kw_lookup(const char *kwtbl
, char ***pargs
)
136 if (strcmp(kwtbl
+2, **pargs
) == 0) { /* Found a match. */
138 if (kwtbl
[1] & KW_TAKES_ARG
) {
139 if (!**pargs
) { /* No more args! */
142 *pargs
+= 1; /* Calling routine will use args[-1]. */
152 /* Add or delete a route, depending on action. */
154 static void INET_setroute(int action
, char **args
)
157 const char *netmask
= NULL
;
158 int skfd
, isnet
, xflag
;
160 /* Grab the -net or -host options. Remember they were transformed. */
161 xflag
= kw_lookup(tbl_hash_net_host
, &args
);
163 /* If we did grab -net or -host, make sure we still have an arg left. */
168 /* Clean out the RTREQ structure. */
169 memset(&rt
, 0, sizeof(rt
));
172 const char *target
= *args
++;
175 /* recognize x.x.x.x/mask format. */
176 prefix
= strchr(target
, '/');
180 prefix_len
= xatoul_range(prefix
+1, 0, 32);
181 mask_in_addr(rt
) = htonl( ~ (0xffffffffUL
>> prefix_len
));
184 rt
.rt_genmask
.sa_family
= AF_INET
;
187 /* Default netmask. */
188 netmask
= bb_str_default
;
190 /* Prefer hostname lookup is -host flag (xflag==1) was given. */
191 isnet
= INET_resolve(target
, (struct sockaddr_in
*) &rt
.rt_dst
,
192 (xflag
& HOST_FLAG
));
194 bb_error_msg_and_die("resolving %s", target
);
197 /* do not destroy prefix for process args */
202 if (xflag
) { /* Reinit isnet if -net or -host was specified. */
203 isnet
= (xflag
& NET_FLAG
);
206 /* Fill in the other fields. */
207 rt
.rt_flags
= ((isnet
) ? RTF_UP
: (RTF_UP
| RTF_HOST
));
210 int k
= kw_lookup(tbl_ipvx
, &args
);
211 const char *args_m1
= args
[-1];
213 if (k
& KW_IPVx_FLAG_ONLY
) {
214 rt
.rt_flags
|= flags_ipvx
[k
& 3];
219 if (k
== KW_IPVx_METRIC
) {
220 rt
.rt_metric
= xatoul(args_m1
) + 1;
225 if (k
== KW_IPVx_NETMASK
) {
226 struct sockaddr mask
;
228 if (mask_in_addr(rt
)) {
233 isnet
= INET_resolve(netmask
, (struct sockaddr_in
*) &mask
, 0);
235 bb_error_msg_and_die("resolving %s", netmask
);
237 rt
.rt_genmask
= full_mask(mask
);
241 if (k
== KW_IPVx_GATEWAY
) {
242 if (rt
.rt_flags
& RTF_GATEWAY
) {
246 isnet
= INET_resolve(args_m1
,
247 (struct sockaddr_in
*) &rt
.rt_gateway
, 1);
248 rt
.rt_flags
|= RTF_GATEWAY
;
252 bb_error_msg_and_die("resolving %s", args_m1
);
254 bb_error_msg_and_die("gateway %s is a NETWORK", args_m1
);
259 if (k
== KW_IPVx_MSS
) { /* Check valid MSS bounds. */
260 rt
.rt_flags
|= RTF_MSS
;
261 rt
.rt_mss
= xatoul_range(args_m1
, 64, 32768);
265 if (k
== KW_IPVx_WINDOW
) { /* Check valid window bounds. */
266 rt
.rt_flags
|= RTF_WINDOW
;
267 rt
.rt_window
= xatoul_range(args_m1
, 128, INT_MAX
);
272 if (k
== KW_IPVx_IRTT
) {
273 rt
.rt_flags
|= RTF_IRTT
;
274 rt
.rt_irtt
= xatoul(args_m1
);
275 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");
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
))) {
288 /* Don't use args_m1 here since args may have changed! */
289 rt
.rt_dev
= args
[-1];
293 /* Nothing matched. */
298 if ((rt
.rt_flags
& RTF_REJECT
) && !rt
.rt_dev
) {
299 rt
.rt_dev
= (char*)"lo";
303 /* sanity checks.. */
304 if (mask_in_addr(rt
)) {
305 uint32_t mask
= mask_in_addr(rt
);
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
);
312 if (mask
& (mask
+ 1)) {
313 bb_error_msg_and_die("bogus netmask %s", netmask
);
315 mask
= ((struct sockaddr_in
*) &rt
.rt_dst
)->sin_addr
.s_addr
;
316 if (mask
& ~(uint32_t)mask_in_addr(rt
)) {
317 bb_error_msg_and_die("netmask and route address conflict");
321 /* Fill out netmask if still unset */
322 if ((action
== RTACTION_ADD
) && (rt
.rt_flags
& RTF_HOST
)) {
323 mask_in_addr(rt
) = 0xffffffff;
326 /* Create a socket to the INET kernel. */
327 skfd
= xsocket(AF_INET
, SOCK_DGRAM
, 0);
329 if (action
== RTACTION_ADD
)
330 xioctl(skfd
, SIOCADDRT
, &rt
);
332 xioctl(skfd
, SIOCDELRT
, &rt
);
334 if (ENABLE_FEATURE_CLEAN_UP
) close(skfd
);
337 #if ENABLE_FEATURE_IPV6
339 static void INET6_setroute(int action
, char **args
)
341 struct sockaddr_in6 sa6
;
343 int prefix_len
, skfd
;
346 /* We know args isn't NULL from the check in route_main. */
347 const char *target
= *args
++;
349 if (strcmp(target
, bb_str_default
) == 0) {
351 memset(&sa6
, 0, sizeof(sa6
));
354 cp
= strchr(target
, '/'); /* Yes... const to non is ok. */
357 prefix_len
= xatoul_range(cp
+ 1, 0, 128);
361 if (INET6_resolve(target
, (struct sockaddr_in6
*) &sa6
) < 0) {
362 bb_error_msg_and_die("resolving %s", target
);
366 /* Clean out the RTREQ structure. */
367 memset(&rt
, 0, sizeof(rt
));
369 memcpy(&rt
.rtmsg_dst
, sa6
.sin6_addr
.s6_addr
, sizeof(struct in6_addr
));
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
);
379 int k
= kw_lookup(tbl_ipvx
, &args
);
380 const char *args_m1
= args
[-1];
382 if ((k
== KW_IPVx_MOD
) || (k
== KW_IPVx_DYN
)) {
383 rt
.rtmsg_flags
|= flags_ipvx
[k
& 3];
387 if (k
== KW_IPVx_METRIC
) {
388 rt
.rtmsg_metric
= xatoul(args_m1
);
392 if (k
== KW_IPVx_GATEWAY
) {
393 if (rt
.rtmsg_flags
& RTF_GATEWAY
) {
397 if (INET6_resolve(args_m1
, (struct sockaddr_in6
*) &sa6
) < 0) {
398 bb_error_msg_and_die("resolving %s", args_m1
);
400 memcpy(&rt
.rtmsg_gateway
, sa6
.sin6_addr
.s6_addr
,
401 sizeof(struct in6_addr
));
402 rt
.rtmsg_flags
|= RTF_GATEWAY
;
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
))) {
409 /* Don't use args_m1 here since args may have changed! */
414 /* Nothing matched. */
418 /* Create a socket to the INET6 kernel. */
419 skfd
= xsocket(AF_INET6
, SOCK_DGRAM
, 0);
421 rt
.rtmsg_ifindex
= 0;
425 memset(&ifr
, 0, sizeof(ifr
));
426 strncpy_IFNAMSIZ(ifr
.ifr_name
, devname
);
427 xioctl(skfd
, SIOGIFINDEX
, &ifr
);
428 rt
.rtmsg_ifindex
= ifr
.ifr_ifindex
;
431 /* Tell the kernel to accept this route. */
432 if (action
== RTACTION_ADD
)
433 xioctl(skfd
, SIOCADDRT
, &rt
);
435 xioctl(skfd
, SIOCDELRT
, &rt
);
437 if (ENABLE_FEATURE_CLEAN_UP
) close(skfd
);
441 static const unsigned flagvals
[] = { /* Must agree with flagchars[]. */
447 #if ENABLE_FEATURE_IPV6
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)
457 /* Must agree with flagvals[]. */
458 static const char flagchars
[] ALIGN1
=
460 #if ENABLE_FEATURE_IPV6
465 static void set_flags(char *flagstr
, int flags
)
471 for (i
= 0; (*flagstr
= flagchars
[i
]) != 0; i
++) {
472 if (flags
& flagvals
[i
]) {
478 /* also used in netstat */
479 void FAST_FUNC
bb_displayroutes(int noresolve
, int netstatfmt
)
481 char devname
[64], flags
[16], *sdest
, *sgw
;
482 unsigned long d
, g
, m
;
483 int flgs
, ref
, use
, metric
, mtu
, win
, ir
;
484 struct sockaddr_in s_addr
;
487 FILE *fp
= xfopen_for_read("/proc/net/route");
489 printf("Kernel IP routing table\n"
490 "Destination Gateway Genmask Flags %s Iface\n",
491 netstatfmt
? " MSS Window irtt" : "Metric Ref Use");
493 if (fscanf(fp
, "%*[^\n]\n") < 0) { /* Skip the first line. */
494 goto ERROR
; /* Empty or missing line, or read error. */
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
,
502 if ((r
< 0) && feof(fp
)) { /* EOF with no (nonspace) chars read. */
506 bb_error_msg_and_die("fscanf");
509 if (!(flgs
& RTF_UP
)) { /* Skip interfaces that are down. */
513 set_flags(flags
, (flgs
& IPV4_MASK
));
515 if (flgs
& RTF_REJECT
) {
520 memset(&s_addr
, 0, sizeof(struct sockaddr_in
));
521 s_addr
.sin_family
= AF_INET
;
522 s_addr
.sin_addr
.s_addr
= d
;
523 sdest
= INET_rresolve(&s_addr
, (noresolve
| 0x8000), m
); /* 'default' instead of '*' */
524 s_addr
.sin_addr
.s_addr
= g
;
525 sgw
= INET_rresolve(&s_addr
, (noresolve
| 0x4000), m
); /* Host instead of net */
527 /* "%15.15s" truncates hostnames, do we really want that? */
528 printf("%-15.15s %-15.15s %-16s%-6s", sdest
, sgw
, inet_ntoa(mask
), flags
);
532 printf("%5d %-5d %6d %s\n", mtu
, win
, ir
, devname
);
534 printf("%-6d %-2d %7d %s\n", metric
, ref
, use
, devname
);
539 #if ENABLE_FEATURE_IPV6
541 static void INET6_displayroutes(void)
543 char addr6
[128], *naddr6
;
544 /* 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. */
551 char iface
[16], flags
[16];
552 int iflags
, metric
, refcnt
, use
, prefix_len
, slen
;
553 struct sockaddr_in6 snaddr6
;
555 FILE *fp
= xfopen_for_read("/proc/net/ipv6_route");
557 printf("Kernel IPv6 routing table\n%-44s%-40s"
558 "Flags Metric Ref Use Iface\n",
559 "Destination", "Next Hop");
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
);
567 if ((r
< 0) && feof(fp
)) { /* EOF with no (nonspace) chars read. */
571 bb_error_msg_and_die("fscanf");
574 /* 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. */
583 if (i
== 40) { /* nul terminator for 1st address? */
584 addr6x
[39] = 0; /* Fixup... need 0 instead of ':'. */
585 ++p
; /* Skip and continue. */
594 } while (i
< 40+28+7);
597 if (!(iflags
& RTF_UP
)) { /* Skip interfaces that are down. */
601 set_flags(flags
, (iflags
& IPV6_MASK
));
605 inet_pton(AF_INET6
, addr6x
+ r
,
606 (struct sockaddr
*) &snaddr6
.sin6_addr
);
607 snaddr6
.sin6_family
= AF_INET6
;
608 naddr6
= INET6_rresolve((struct sockaddr_in6
*) &snaddr6
,
609 0x0fff /* Apparently, upstream never resolves. */
612 if (!r
) { /* 1st pass */
613 snprintf(addr6
, sizeof(addr6
), "%s/%d", naddr6
, prefix_len
);
616 } else { /* 2nd pass */
617 /* Print the info. */
618 printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n",
619 addr6
, naddr6
, flags
, metric
, refcnt
, use
, iface
);
629 #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. */
634 /* 1st byte is offset to next entry offset. 2nd byte is return value. */
635 /* 2nd byte matches RTACTION_* code */
636 static const char tbl_verb
[] ALIGN1
=
639 /* "\011\002delete\0" */
640 "\010\002delete" /* Since it's last, we can save a byte. */
643 int route_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
644 int route_main(int argc UNUSED_PARAM
, char **argv
)
651 /* First, remap '-net' and '-host' to avoid getopt problems. */
654 if (strcmp(*p
, "-net") == 0 || strcmp(*p
, "-host") == 0) {
659 opt
= getopt32(argv
, "A:ne", &family
);
661 if ((opt
& ROUTE_OPT_A
) && strcmp(family
, "inet") != 0) {
662 #if ENABLE_FEATURE_IPV6
663 if (strcmp(family
, "inet6") == 0) {
664 opt
|= ROUTE_OPT_INET6
; /* Set flag for ipv6. */
672 /* No more args means display the routing table. */
674 int noresolve
= (opt
& ROUTE_OPT_n
) ? 0x0fff : 0;
675 #if ENABLE_FEATURE_IPV6
676 if (opt
& ROUTE_OPT_INET6
)
677 INET6_displayroutes();
680 bb_displayroutes(noresolve
, opt
& ROUTE_OPT_e
);
682 fflush_stdout_and_exit(EXIT_SUCCESS
);
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. */
691 #if ENABLE_FEATURE_IPV6
692 if (opt
& ROUTE_OPT_INET6
)
693 INET6_setroute(what
, argv
);
696 INET_setroute(what
, argv
);