2 * iproute.c "ip route".
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
14 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
15 * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
18 #include <sys/socket.h>
31 #define RTAX_RTTVAR RTAX_HOPS
42 struct rtnl_handle *rth;
43 int protocol, protocolmask;
58 static int flush_update(void)
60 if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
61 perror("Failed to send flush request\n");
68 static int print_route(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
70 FILE *fp = (FILE*)arg;
71 struct rtmsg *r = NLMSG_DATA(n);
72 int len = n->nlmsg_len;
73 struct rtattr * tb[RTA_MAX+1];
81 if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
82 fprintf(stderr, "Not a route: %08x %08x %08x\n",
83 n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
86 if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
88 len -= NLMSG_LENGTH(sizeof(*r));
90 bb_error_msg("wrong nlmsg len %d", len);
94 if (r->rtm_family == AF_INET6)
96 else if (r->rtm_family == AF_INET)
99 if (r->rtm_family == AF_INET6) {
102 if (!(r->rtm_flags&RTM_F_CLONED)) {
106 if (r->rtm_flags&RTM_F_CLONED) {
109 if (filter.tb == RT_TABLE_LOCAL) {
110 if (r->rtm_type != RTN_LOCAL) {
113 } else if (filter.tb == RT_TABLE_MAIN) {
114 if (r->rtm_type == RTN_LOCAL) {
123 if (filter.tb > 0 && filter.tb != r->rtm_table) {
127 if (filter.rdst.family &&
128 (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) {
131 if (filter.mdst.family &&
132 (r->rtm_family != filter.mdst.family ||
133 (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) {
136 if (filter.rsrc.family &&
137 (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) {
140 if (filter.msrc.family &&
141 (r->rtm_family != filter.msrc.family ||
142 (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) {
146 memset(tb, 0, sizeof(tb));
147 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
149 if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
151 if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
152 inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
155 if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
157 if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
158 inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
162 r->rtm_family == AF_INET6 &&
163 r->rtm_dst_len == 0 &&
164 r->rtm_type == RTN_UNREACHABLE &&
166 *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
171 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
175 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
176 memcpy(fn, n, n->nlmsg_len);
177 fn->nlmsg_type = RTM_DELROUTE;
178 fn->nlmsg_flags = NLM_F_REQUEST;
179 fn->nlmsg_seq = ++filter.rth->seq;
180 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
185 if (n->nlmsg_type == RTM_DELROUTE) {
186 fprintf(fp, "Deleted ");
188 if (r->rtm_type != RTN_UNICAST && !filter.type) {
189 fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
193 if (r->rtm_dst_len != host_len) {
194 fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
195 RTA_PAYLOAD(tb[RTA_DST]),
196 RTA_DATA(tb[RTA_DST]),
201 fprintf(fp, "%s ", format_host(r->rtm_family,
202 RTA_PAYLOAD(tb[RTA_DST]),
203 RTA_DATA(tb[RTA_DST]),
207 } else if (r->rtm_dst_len) {
208 fprintf(fp, "0/%d ", r->rtm_dst_len);
210 fprintf(fp, "default ");
213 if (r->rtm_src_len != host_len) {
214 fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
215 RTA_PAYLOAD(tb[RTA_SRC]),
216 RTA_DATA(tb[RTA_SRC]),
221 fprintf(fp, "from %s ", format_host(r->rtm_family,
222 RTA_PAYLOAD(tb[RTA_SRC]),
223 RTA_DATA(tb[RTA_SRC]),
227 } else if (r->rtm_src_len) {
228 fprintf(fp, "from 0/%u ", r->rtm_src_len);
230 if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
231 fprintf(fp, "via %s ",
232 format_host(r->rtm_family,
233 RTA_PAYLOAD(tb[RTA_GATEWAY]),
234 RTA_DATA(tb[RTA_GATEWAY]),
235 abuf, sizeof(abuf)));
237 if (tb[RTA_OIF] && filter.oifmask != -1) {
238 fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
241 if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
242 /* Do not use format_host(). It is our local addr
243 and symbolic name will not be useful.
245 fprintf(fp, " src %s ",
246 rt_addr_n2a(r->rtm_family,
247 RTA_PAYLOAD(tb[RTA_PREFSRC]),
248 RTA_DATA(tb[RTA_PREFSRC]),
249 abuf, sizeof(abuf)));
251 if (tb[RTA_PRIORITY]) {
252 fprintf(fp, " metric %d ", *(__u32*)RTA_DATA(tb[RTA_PRIORITY]));
254 if (r->rtm_family == AF_INET6) {
255 struct rta_cacheinfo *ci = NULL;
256 if (tb[RTA_CACHEINFO]) {
257 ci = RTA_DATA(tb[RTA_CACHEINFO]);
259 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
264 if (r->rtm_flags & RTM_F_CLONED) {
265 fprintf(fp, "%s cache ", _SL_);
267 if (ci->rta_expires) {
268 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
270 if (ci->rta_error != 0) {
271 fprintf(fp, " error %d", ci->rta_error);
274 if (ci->rta_error != 0)
275 fprintf(fp, " error %d", ci->rta_error);
278 if (tb[RTA_IIF] && filter.iifmask != -1) {
279 fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
286 static int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
288 struct rtnl_handle rth;
295 struct rtattr * mxrta = (void*)mxbuf;
303 memset(&req, 0, sizeof(req));
305 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
306 req.n.nlmsg_flags = NLM_F_REQUEST|flags;
307 req.n.nlmsg_type = cmd;
308 req.r.rtm_family = preferred_family;
309 req.r.rtm_table = RT_TABLE_MAIN;
310 req.r.rtm_scope = RT_SCOPE_NOWHERE;
312 if (cmd != RTM_DELROUTE) {
313 req.r.rtm_protocol = RTPROT_BOOT;
314 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
315 req.r.rtm_type = RTN_UNICAST;
318 mxrta->rta_type = RTA_METRICS;
319 mxrta->rta_len = RTA_LENGTH(0);
322 if (strcmp(*argv, "src") == 0) {
325 get_addr(&addr, *argv, req.r.rtm_family);
326 if (req.r.rtm_family == AF_UNSPEC) {
327 req.r.rtm_family = addr.family;
329 addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
330 } else if (strcmp(*argv, "via") == 0) {
334 get_addr(&addr, *argv, req.r.rtm_family);
335 if (req.r.rtm_family == AF_UNSPEC) {
336 req.r.rtm_family = addr.family;
338 addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
339 } else if (strcmp(*argv, "mtu") == 0) {
342 if (strcmp(*argv, "lock") == 0) {
343 mxlock |= (1<<RTAX_MTU);
346 if (get_unsigned(&mtu, *argv, 0)) {
347 invarg("\"mtu\" value is invalid\n", *argv);
349 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
350 } else if (matches(*argv, "protocol") == 0) {
353 if (rtnl_rtprot_a2n(&prot, *argv))
354 invarg("\"protocol\" value is invalid\n", *argv);
355 req.r.rtm_protocol = prot;
357 } else if (strcmp(*argv, "dev") == 0 ||
358 strcmp(*argv, "oif") == 0) {
365 if (strcmp(*argv, "to") == 0) {
368 if ((**argv < '0' || **argv > '9') &&
369 rtnl_rtntype_a2n(&type, *argv) == 0) {
371 req.r.rtm_type = type;
376 duparg2("to", *argv);
378 get_prefix(&dst, *argv, req.r.rtm_family);
379 if (req.r.rtm_family == AF_UNSPEC) {
380 req.r.rtm_family = dst.family;
382 req.r.rtm_dst_len = dst.bitlen;
385 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
391 if (rtnl_open(&rth, 0) < 0) {
401 if ((idx = ll_name_to_index(d)) == 0) {
402 bb_error_msg("Cannot find device \"%s\"", d);
405 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
409 if (mxrta->rta_len > RTA_LENGTH(0)) {
411 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
413 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
416 if (req.r.rtm_family == AF_UNSPEC) {
417 req.r.rtm_family = AF_INET;
420 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
427 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
433 struct sockaddr_nl nladdr;
435 memset(&nladdr, 0, sizeof(nladdr));
436 memset(&req, 0, sizeof(req));
437 nladdr.nl_family = AF_NETLINK;
439 req.nlh.nlmsg_len = sizeof(req);
440 req.nlh.nlmsg_type = RTM_GETROUTE;
441 req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
442 req.nlh.nlmsg_pid = 0;
443 req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
444 req.rtm.rtm_family = family;
445 req.rtm.rtm_flags |= RTM_F_CLONED;
447 return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
450 static int iproute_flush_cache(void)
452 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
455 int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
459 fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
463 len = strlen (buffer);
465 if ((write (flush_fd, (void *)buffer, len)) < len) {
466 fprintf (stderr, "Cannot flush routing cache\n");
473 static void iproute_reset_filter(void)
475 memset(&filter, 0, sizeof(filter));
476 filter.mdst.bitlen = -1;
477 filter.msrc.bitlen = -1;
480 static int iproute_list_or_flush(int argc, char **argv, int flush)
482 int do_ipv6 = preferred_family;
483 struct rtnl_handle rth;
487 iproute_reset_filter();
488 filter.tb = RT_TABLE_MAIN;
490 if (flush && argc <= 0) {
491 fprintf(stderr, "\"ip route flush\" requires arguments.\n");
496 if (matches(*argv, "protocol") == 0) {
499 filter.protocolmask = -1;
500 if (rtnl_rtprot_a2n(&prot, *argv)) {
501 if (strcmp(*argv, "all") != 0) {
502 invarg("invalid \"protocol\"\n", *argv);
505 filter.protocolmask = 0;
507 filter.protocol = prot;
508 } else if (strcmp(*argv, "dev") == 0 ||
509 strcmp(*argv, "oif") == 0) {
512 } else if (strcmp(*argv, "iif") == 0) {
515 } else if (matches(*argv, "from") == 0) {
517 if (matches(*argv, "root") == 0) {
519 get_prefix(&filter.rsrc, *argv, do_ipv6);
520 } else if (matches(*argv, "match") == 0) {
522 get_prefix(&filter.msrc, *argv, do_ipv6);
524 if (matches(*argv, "exact") == 0) {
527 get_prefix(&filter.msrc, *argv, do_ipv6);
528 filter.rsrc = filter.msrc;
531 if (matches(*argv, "to") == 0) {
534 if (matches(*argv, "root") == 0) {
536 get_prefix(&filter.rdst, *argv, do_ipv6);
537 } else if (matches(*argv, "match") == 0) {
539 get_prefix(&filter.mdst, *argv, do_ipv6);
540 } else if (matches(*argv, "table") == 0) {
542 if (matches(*argv, "cache") == 0) {
544 } else if (matches(*argv, "main") != 0) {
545 invarg("invalid \"table\"", *argv);
547 } else if (matches(*argv, "cache") == 0) {
550 if (matches(*argv, "exact") == 0) {
553 get_prefix(&filter.mdst, *argv, do_ipv6);
554 filter.rdst = filter.mdst;
560 if (do_ipv6 == AF_UNSPEC && filter.tb) {
564 if (rtnl_open(&rth, 0) < 0) {
574 if ((idx = ll_name_to_index(id)) == 0) {
575 bb_error_msg("Cannot find device \"%s\"", id);
582 if ((idx = ll_name_to_index(od)) == 0) {
583 bb_error_msg("Cannot find device \"%s\"", od);
592 char flushb[4096-512];
594 if (filter.tb == -1) {
595 if (do_ipv6 != AF_INET6)
596 iproute_flush_cache();
597 if (do_ipv6 == AF_INET)
601 filter.flushb = flushb;
603 filter.flushe = sizeof(flushb);
607 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
608 perror("Cannot send dump request");
612 if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
613 bb_error_msg("Flush terminated\n");
616 if (filter.flushed == 0) {
618 if (filter.tb != -1 || do_ipv6 == AF_INET6)
619 fprintf(stderr, "Nothing to flush.\n");
625 if (flush_update() < 0)
630 if (filter.tb != -1) {
631 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
632 bb_perror_msg_and_die("Cannot send dump request");
635 if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
636 bb_perror_msg_and_die("Cannot send dump request");
640 if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
641 bb_error_msg_and_die("Dump terminated");
648 static int iproute_get(int argc, char **argv)
650 struct rtnl_handle rth;
660 const char *options[] = { "from", "iif", "oif", "dev", "notify", "connected", "to", 0 };
662 memset(&req, 0, sizeof(req));
664 iproute_reset_filter();
666 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
667 req.n.nlmsg_flags = NLM_F_REQUEST;
668 req.n.nlmsg_type = RTM_GETROUTE;
669 req.r.rtm_family = preferred_family;
671 req.r.rtm_protocol = 0;
674 req.r.rtm_src_len = 0;
675 req.r.rtm_dst_len = 0;
679 switch (compare_string_array(options, *argv)) {
685 get_prefix(&addr, *argv, req.r.rtm_family);
686 if (req.r.rtm_family == AF_UNSPEC) {
687 req.r.rtm_family = addr.family;
690 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
692 req.r.rtm_src_len = addr.bitlen;
705 req.r.rtm_flags |= RTM_F_NOTIFY;
707 case 5: /* connected */
715 get_prefix(&addr, *argv, req.r.rtm_family);
716 if (req.r.rtm_family == AF_UNSPEC) {
717 req.r.rtm_family = addr.family;
720 addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
722 req.r.rtm_dst_len = addr.bitlen;
728 if (req.r.rtm_dst_len == 0) {
729 bb_error_msg_and_die("need at least destination address");
732 if (rtnl_open(&rth, 0) < 0)
741 if ((idx = ll_name_to_index(idev)) == 0) {
742 bb_error_msg("Cannot find device \"%s\"", idev);
745 addattr32(&req.n, sizeof(req), RTA_IIF, idx);
748 if ((idx = ll_name_to_index(odev)) == 0) {
749 bb_error_msg("Cannot find device \"%s\"", odev);
752 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
756 if (req.r.rtm_family == AF_UNSPEC) {
757 req.r.rtm_family = AF_INET;
760 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
764 if (connected && !from_ok) {
765 struct rtmsg *r = NLMSG_DATA(&req.n);
766 int len = req.n.nlmsg_len;
767 struct rtattr * tb[RTA_MAX+1];
769 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
770 bb_error_msg_and_die("An error :-)");
773 if (req.n.nlmsg_type != RTM_NEWROUTE) {
774 bb_error_msg("Not a route?");
777 len -= NLMSG_LENGTH(sizeof(*r));
779 bb_error_msg("Wrong len %d", len);
783 memset(tb, 0, sizeof(tb));
784 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
786 if (tb[RTA_PREFSRC]) {
787 tb[RTA_PREFSRC]->rta_type = RTA_SRC;
788 r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
789 } else if (!tb[RTA_SRC]) {
790 bb_error_msg("Failed to connect the route");
793 if (!odev && tb[RTA_OIF]) {
794 tb[RTA_OIF]->rta_type = 0;
796 if (tb[RTA_GATEWAY]) {
797 tb[RTA_GATEWAY]->rta_type = 0;
799 if (!idev && tb[RTA_IIF]) {
800 tb[RTA_IIF]->rta_type = 0;
802 req.n.nlmsg_flags = NLM_F_REQUEST;
803 req.n.nlmsg_type = RTM_GETROUTE;
805 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
810 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
811 bb_error_msg_and_die("An error :-)");
817 int do_iproute(int argc, char **argv)
819 const char *ip_route_commands[] = { "add", "append", "change", "chg",
820 "delete", "del", "get", "list", "show", "prepend", "replace", "test", "flush", 0 };
821 unsigned short command_num = 7;
822 unsigned int flags = 0;
823 int cmd = RTM_NEWROUTE;
826 command_num = compare_string_array(ip_route_commands, *argv);
828 switch(command_num) {
830 flags = NLM_F_CREATE|NLM_F_EXCL;
833 flags = NLM_F_CREATE|NLM_F_APPEND;
837 flags = NLM_F_REPLACE;
844 return iproute_get(argc-1, argv+1);
847 return iproute_list_or_flush(argc-1, argv+1, 0);
848 case 9: /* prepend */
849 flags = NLM_F_CREATE;
850 case 10: /* replace */
851 flags = NLM_F_CREATE|NLM_F_REPLACE;
855 return iproute_list_or_flush(argc-1, argv+1, 1);
857 bb_error_msg_and_die("Unknown command %s", *argv);
860 return iproute_modify(cmd, flags, argc-1, argv+1);