1 /* vi: set sw=4 ts=4: */
3 * iproute.c "ip route".
5 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
7 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
12 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
13 * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
16 #include "ip_common.h" /* #include "libbb.h" is inside */
21 #define RTAX_RTTVAR RTAX_HOPS
25 typedef struct filter_t {
31 struct rtnl_handle *rth;
32 int protocol, protocolmask;
47 #define filter (*(filter_t*)&bb_common_bufsiz1)
49 static int flush_update(void)
51 if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
52 bb_perror_msg("failed to send flush request");
59 static unsigned get_hz(void)
61 static unsigned hz_internal;
67 fp = fopen_for_read("/proc/net/psched");
71 if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
77 hz_internal = sysconf(_SC_CLK_TCK);
81 static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
82 struct nlmsghdr *n, void *arg UNUSED_PARAM)
84 struct rtmsg *r = NLMSG_DATA(n);
85 int len = n->nlmsg_len;
86 struct rtattr * tb[RTA_MAX+1];
93 if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
94 fprintf(stderr, "Not a route: %08x %08x %08x\n",
95 n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
98 if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
100 len -= NLMSG_LENGTH(sizeof(*r));
102 bb_error_msg_and_die("wrong nlmsg len %d", len);
104 if (r->rtm_family == AF_INET6)
106 else if (r->rtm_family == AF_INET)
109 if (r->rtm_family == AF_INET6) {
112 if (!(r->rtm_flags & RTM_F_CLONED)) {
116 if (r->rtm_flags & RTM_F_CLONED) {
119 if (filter.tb == RT_TABLE_LOCAL) {
120 if (r->rtm_type != RTN_LOCAL) {
123 } else if (filter.tb == RT_TABLE_MAIN) {
124 if (r->rtm_type == RTN_LOCAL) {
133 if (filter.tb > 0 && filter.tb != r->rtm_table) {
137 if (filter.rdst.family &&
138 (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) {
141 if (filter.mdst.family &&
142 (r->rtm_family != filter.mdst.family ||
143 (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) {
146 if (filter.rsrc.family &&
147 (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) {
150 if (filter.msrc.family &&
151 (r->rtm_family != filter.msrc.family ||
152 (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) {
156 memset(tb, 0, sizeof(tb));
157 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
159 if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
161 if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
162 inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
165 if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
167 if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
168 inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
172 r->rtm_family == AF_INET6 &&
173 r->rtm_dst_len == 0 &&
174 r->rtm_type == RTN_UNREACHABLE &&
176 *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
181 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
183 bb_error_msg_and_die("flush");
185 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
186 memcpy(fn, n, n->nlmsg_len);
187 fn->nlmsg_type = RTM_DELROUTE;
188 fn->nlmsg_flags = NLM_F_REQUEST;
189 fn->nlmsg_seq = ++filter.rth->seq;
190 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
195 if (n->nlmsg_type == RTM_DELROUTE) {
198 if (r->rtm_type != RTN_UNICAST && !filter.type) {
199 printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1));
203 if (r->rtm_dst_len != host_len) {
204 printf("%s/%u ", rt_addr_n2a(r->rtm_family,
205 RTA_DATA(tb[RTA_DST]),
210 printf("%s ", format_host(r->rtm_family,
211 RTA_PAYLOAD(tb[RTA_DST]),
212 RTA_DATA(tb[RTA_DST]),
216 } else if (r->rtm_dst_len) {
217 printf("0/%d ", r->rtm_dst_len);
222 if (r->rtm_src_len != host_len) {
223 printf("from %s/%u ", rt_addr_n2a(r->rtm_family,
224 RTA_DATA(tb[RTA_SRC]),
229 printf("from %s ", format_host(r->rtm_family,
230 RTA_PAYLOAD(tb[RTA_SRC]),
231 RTA_DATA(tb[RTA_SRC]),
235 } else if (r->rtm_src_len) {
236 printf("from 0/%u ", r->rtm_src_len);
238 if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
239 printf("via %s ", format_host(r->rtm_family,
240 RTA_PAYLOAD(tb[RTA_GATEWAY]),
241 RTA_DATA(tb[RTA_GATEWAY]),
242 abuf, sizeof(abuf)));
244 if (tb[RTA_OIF] && filter.oifmask != -1) {
245 printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
248 if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
249 /* Do not use format_host(). It is our local addr
250 and symbolic name will not be useful.
252 printf(" src %s ", rt_addr_n2a(r->rtm_family,
253 RTA_DATA(tb[RTA_PREFSRC]),
254 abuf, sizeof(abuf)));
256 if (tb[RTA_PRIORITY]) {
257 printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
259 if (r->rtm_family == AF_INET6) {
260 struct rta_cacheinfo *ci = NULL;
261 if (tb[RTA_CACHEINFO]) {
262 ci = RTA_DATA(tb[RTA_CACHEINFO]);
264 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
265 if (r->rtm_flags & RTM_F_CLONED) {
266 printf("%c cache ", _SL_);
268 if (ci->rta_expires) {
269 printf(" expires %dsec", ci->rta_expires / get_hz());
271 if (ci->rta_error != 0) {
272 printf(" error %d", ci->rta_error);
275 if (ci->rta_error != 0)
276 printf(" error %d", ci->rta_error);
279 if (tb[RTA_IIF] && filter.iifmask != -1) {
280 printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
286 /* Return value becomes exitcode. It's okay to not return at all */
287 static int iproute_modify(int cmd, unsigned flags, char **argv)
289 static const char keywords[] ALIGN1 =
290 "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0")
291 "dev\0""oif\0""to\0""metric\0";
297 IF_FEATURE_IP_RULE(ARG_table,)
309 struct rtnl_handle rth;
316 struct rtattr * mxrta = (void*)mxbuf;
322 memset(&req, 0, sizeof(req));
324 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
325 req.n.nlmsg_flags = NLM_F_REQUEST | flags;
326 req.n.nlmsg_type = cmd;
327 req.r.rtm_family = preferred_family;
328 if (RT_TABLE_MAIN) /* if it is zero, memset already did it */
329 req.r.rtm_table = RT_TABLE_MAIN;
330 if (RT_SCOPE_NOWHERE)
331 req.r.rtm_scope = RT_SCOPE_NOWHERE;
333 if (cmd != RTM_DELROUTE) {
334 req.r.rtm_protocol = RTPROT_BOOT;
335 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
336 req.r.rtm_type = RTN_UNICAST;
339 mxrta->rta_type = RTA_METRICS;
340 mxrta->rta_len = RTA_LENGTH(0);
343 arg = index_in_substrings(keywords, *argv);
344 if (arg == ARG_src) {
347 get_addr(&addr, *argv, req.r.rtm_family);
348 if (req.r.rtm_family == AF_UNSPEC)
349 req.r.rtm_family = addr.family;
350 addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
351 } else if (arg == ARG_via) {
355 get_addr(&addr, *argv, req.r.rtm_family);
356 if (req.r.rtm_family == AF_UNSPEC) {
357 req.r.rtm_family = addr.family;
359 addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
360 } else if (arg == ARG_mtu) {
363 if (index_in_strings(keywords, *argv) == PARM_lock) {
364 mxlock |= (1 << RTAX_MTU);
367 mtu = get_unsigned(*argv, "mtu");
368 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
369 } else if (arg == ARG_protocol) {
372 if (rtnl_rtprot_a2n(&prot, *argv))
373 invarg(*argv, "protocol");
374 req.r.rtm_protocol = prot;
376 #if ENABLE_FEATURE_IP_RULE
377 } else if (arg == ARG_table) {
380 if (rtnl_rttable_a2n(&tid, *argv))
381 invarg(*argv, "table");
382 req.r.rtm_table = tid;
384 } else if (arg == ARG_dev || arg == ARG_oif) {
387 } else if (arg == ARG_metric) {
390 metric = get_u32(*argv, "metric");
391 addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
399 if ((**argv < '0' || **argv > '9')
400 && rtnl_rtntype_a2n(&type, *argv) == 0) {
402 req.r.rtm_type = type;
407 duparg2("to", *argv);
409 get_prefix(&dst, *argv, req.r.rtm_family);
410 if (req.r.rtm_family == AF_UNSPEC) {
411 req.r.rtm_family = dst.family;
413 req.r.rtm_dst_len = dst.bitlen;
416 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
430 idx = xll_name_to_index(d);
431 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
435 if (mxrta->rta_len > RTA_LENGTH(0)) {
437 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
439 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
442 if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
443 req.r.rtm_scope = RT_SCOPE_HOST;
444 else if (req.r.rtm_type == RTN_BROADCAST ||
445 req.r.rtm_type == RTN_MULTICAST ||
446 req.r.rtm_type == RTN_ANYCAST)
447 req.r.rtm_scope = RT_SCOPE_LINK;
448 else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
449 if (cmd == RTM_DELROUTE)
450 req.r.rtm_scope = RT_SCOPE_NOWHERE;
451 else if (!(ok & gw_ok))
452 req.r.rtm_scope = RT_SCOPE_LINK;
455 if (req.r.rtm_family == AF_UNSPEC) {
456 req.r.rtm_family = AF_INET;
459 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
466 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
472 struct sockaddr_nl nladdr;
474 memset(&nladdr, 0, sizeof(nladdr));
475 memset(&req, 0, sizeof(req));
476 nladdr.nl_family = AF_NETLINK;
478 req.nlh.nlmsg_len = sizeof(req);
480 req.nlh.nlmsg_type = RTM_GETROUTE;
481 if (NLM_F_ROOT | NLM_F_REQUEST)
482 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
483 /*req.nlh.nlmsg_pid = 0; - memset did it already */
484 req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
485 req.rtm.rtm_family = family;
487 req.rtm.rtm_flags = RTM_F_CLONED;
489 return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
492 static void iproute_flush_cache(void)
494 static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
495 int flush_fd = open_or_warn(fn, O_WRONLY);
501 if (write(flush_fd, "-1", 2) < 2) {
502 bb_perror_msg("cannot flush routing cache");
508 static void iproute_reset_filter(void)
510 memset(&filter, 0, sizeof(filter));
511 filter.mdst.bitlen = -1;
512 filter.msrc.bitlen = -1;
515 /* Return value becomes exitcode. It's okay to not return at all */
516 static int iproute_list_or_flush(char **argv, int flush)
518 int do_ipv6 = preferred_family;
519 struct rtnl_handle rth;
522 static const char keywords[] ALIGN1 =
523 /* "ip route list/flush" parameters: */
524 "protocol\0" "dev\0" "oif\0" "iif\0"
525 "via\0" "table\0" "cache\0"
527 /* and possible further keywords */
535 KW_proto, KW_dev, KW_oif, KW_iif,
536 KW_via, KW_table, KW_cache,
547 iproute_reset_filter();
548 filter.tb = RT_TABLE_MAIN;
551 bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
554 arg = index_in_substrings(keywords, *argv);
555 if (arg == KW_proto) {
558 filter.protocolmask = -1;
559 if (rtnl_rtprot_a2n(&prot, *argv)) {
560 if (index_in_strings(keywords, *argv) != KW_all)
561 invarg(*argv, "protocol");
563 filter.protocolmask = 0;
565 filter.protocol = prot;
566 } else if (arg == KW_dev || arg == KW_oif) {
569 } else if (arg == KW_iif) {
572 } else if (arg == KW_via) {
574 get_prefix(&filter.rvia, *argv, do_ipv6);
575 } else if (arg == KW_table) { /* table all/cache/main */
577 parm = index_in_substrings(keywords, *argv);
578 if (parm == KW_cache)
580 else if (parm == KW_all)
582 else if (parm != KW_main) {
583 #if ENABLE_FEATURE_IP_RULE
585 if (rtnl_rttable_a2n(&tid, *argv))
586 invarg(*argv, "table");
589 invarg(*argv, "table");
592 } else if (arg == KW_cache) {
593 /* The command 'ip route flush cache' is used by OpenSWAN.
594 * Assuming it's a synonym for 'ip route flush table cache' */
596 } else if (arg == KW_from) {
598 parm = index_in_substrings(keywords, *argv);
599 if (parm == KW_root) {
601 get_prefix(&filter.rsrc, *argv, do_ipv6);
602 } else if (parm == KW_match) {
604 get_prefix(&filter.msrc, *argv, do_ipv6);
606 if (parm == KW_exact)
608 get_prefix(&filter.msrc, *argv, do_ipv6);
609 filter.rsrc = filter.msrc;
611 } else { /* "to" is the default parameter */
614 arg = index_in_substrings(keywords, *argv);
616 /* parm = arg; - would be more plausible, but we reuse 'arg' here */
617 if (arg == KW_root) {
619 get_prefix(&filter.rdst, *argv, do_ipv6);
620 } else if (arg == KW_match) {
622 get_prefix(&filter.mdst, *argv, do_ipv6);
623 } else { /* "to exact" is the default */
626 get_prefix(&filter.mdst, *argv, do_ipv6);
627 filter.rdst = filter.mdst;
633 if (do_ipv6 == AF_UNSPEC && filter.tb) {
644 idx = xll_name_to_index(id);
649 idx = xll_name_to_index(od);
656 char flushb[4096-512];
658 if (filter.tb == -1) { /* "flush table cache" */
659 if (do_ipv6 != AF_INET6)
660 iproute_flush_cache();
661 if (do_ipv6 == AF_INET)
665 filter.flushb = flushb;
667 filter.flushe = sizeof(flushb);
671 xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
673 xrtnl_dump_filter(&rth, print_route, NULL);
674 if (filter.flushed == 0)
681 if (filter.tb != -1) {
682 xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
683 } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
684 bb_perror_msg_and_die("cannot send dump request");
686 xrtnl_dump_filter(&rth, print_route, NULL);
692 /* Return value becomes exitcode. It's okay to not return at all */
693 static int iproute_get(char **argv)
695 struct rtnl_handle rth;
705 static const char options[] ALIGN1 =
706 "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
708 memset(&req, 0, sizeof(req));
710 iproute_reset_filter();
712 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
714 req.n.nlmsg_flags = NLM_F_REQUEST;
716 req.n.nlmsg_type = RTM_GETROUTE;
717 req.r.rtm_family = preferred_family;
718 /*req.r.rtm_table = 0; - memset did this already */
719 /*req.r.rtm_protocol = 0;*/
720 /*req.r.rtm_scope = 0;*/
721 /*req.r.rtm_type = 0;*/
722 /*req.r.rtm_src_len = 0;*/
723 /*req.r.rtm_dst_len = 0;*/
724 /*req.r.rtm_tos = 0;*/
727 switch (index_in_strings(options, *argv)) {
733 get_prefix(&addr, *argv, req.r.rtm_family);
734 if (req.r.rtm_family == AF_UNSPEC) {
735 req.r.rtm_family = addr.family;
738 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
740 req.r.rtm_src_len = addr.bitlen;
753 req.r.rtm_flags |= RTM_F_NOTIFY;
755 case 5: /* connected */
763 get_prefix(&addr, *argv, req.r.rtm_family);
764 if (req.r.rtm_family == AF_UNSPEC) {
765 req.r.rtm_family = addr.family;
768 addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
770 req.r.rtm_dst_len = addr.bitlen;
776 if (req.r.rtm_dst_len == 0) {
777 bb_error_msg_and_die("need at least destination address");
788 idx = xll_name_to_index(idev);
789 addattr32(&req.n, sizeof(req), RTA_IIF, idx);
792 idx = xll_name_to_index(odev);
793 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
797 if (req.r.rtm_family == AF_UNSPEC) {
798 req.r.rtm_family = AF_INET;
801 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
805 if (connected && !from_ok) {
806 struct rtmsg *r = NLMSG_DATA(&req.n);
807 int len = req.n.nlmsg_len;
808 struct rtattr * tb[RTA_MAX+1];
810 print_route(NULL, &req.n, NULL);
812 if (req.n.nlmsg_type != RTM_NEWROUTE) {
813 bb_error_msg_and_die("not a route?");
815 len -= NLMSG_LENGTH(sizeof(*r));
817 bb_error_msg_and_die("wrong len %d", len);
820 memset(tb, 0, sizeof(tb));
821 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
823 if (tb[RTA_PREFSRC]) {
824 tb[RTA_PREFSRC]->rta_type = RTA_SRC;
825 r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
826 } else if (!tb[RTA_SRC]) {
827 bb_error_msg_and_die("failed to connect the route");
829 if (!odev && tb[RTA_OIF]) {
830 tb[RTA_OIF]->rta_type = 0;
832 if (tb[RTA_GATEWAY]) {
833 tb[RTA_GATEWAY]->rta_type = 0;
835 if (!idev && tb[RTA_IIF]) {
836 tb[RTA_IIF]->rta_type = 0;
838 req.n.nlmsg_flags = NLM_F_REQUEST;
839 req.n.nlmsg_type = RTM_GETROUTE;
841 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
845 print_route(NULL, &req.n, NULL);
849 /* Return value becomes exitcode. It's okay to not return at all */
850 int do_iproute(char **argv)
852 static const char ip_route_commands[] ALIGN1 =
853 /*0-3*/ "add\0""append\0""change\0""chg\0"
854 /*4-7*/ "delete\0""get\0""list\0""show\0"
855 /*8..*/ "prepend\0""replace\0""test\0""flush\0";
858 int cmd = RTM_NEWROUTE;
861 return iproute_list_or_flush(argv, 0);
863 /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
864 /* It probably means that it is using "first match" rule */
865 command_num = index_in_substrings(ip_route_commands, *argv);
867 switch (command_num) {
869 flags = NLM_F_CREATE|NLM_F_EXCL;
872 flags = NLM_F_CREATE|NLM_F_APPEND;
876 flags = NLM_F_REPLACE;
882 return iproute_get(argv+1);
885 return iproute_list_or_flush(argv+1, 0);
886 case 8: /* prepend */
887 flags = NLM_F_CREATE;
889 case 9: /* replace */
890 flags = NLM_F_CREATE|NLM_F_REPLACE;
896 return iproute_list_or_flush(argv+1, 1);
898 bb_error_msg_and_die("unknown command %s", *argv);
901 return iproute_modify(cmd, flags, argv+1);