source: MondoRescue/branches/2.2.9/mindi-busybox/networking/libiproute/iproute.c@ 2725

Last change on this file since 2725 was 2725, checked in by Bruno Cornec, 13 years ago
  • Update mindi-busybox to 1.18.3 to avoid problems with the tar command which is now failing on recent versions with busybox 1.7.3
File size: 21.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 *
7 * Changes:
8 *
9 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
10 * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
11 */
12
13#include "ip_common.h" /* #include "libbb.h" is inside */
14#include "rt_names.h"
15#include "utils.h"
16
17#ifndef RTAX_RTTVAR
18#define RTAX_RTTVAR RTAX_HOPS
19#endif
20
21
22struct filter_t {
23 int tb;
24 smallint flushed;
25 char *flushb;
26 int flushp;
27 int flushe;
28 struct rtnl_handle *rth;
29 //int protocol, protocolmask; - write-only fields?!
30 //int scope, scopemask; - unused
31 //int type; - read-only
32 //int typemask; - unused
33 //int tos, tosmask; - unused
34 int iif, iifmask;
35 int oif, oifmask;
36 //int realm, realmmask; - unused
37 //inet_prefix rprefsrc; - read-only
38 inet_prefix rvia;
39 inet_prefix rdst;
40 inet_prefix mdst;
41 inet_prefix rsrc;
42 inet_prefix msrc;
43} FIX_ALIASING;
44typedef struct filter_t filter_t;
45
46#define G_filter (*(filter_t*)&bb_common_bufsiz1)
47
48static int flush_update(void)
49{
50 if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
51 bb_perror_msg("can't send flush request");
52 return -1;
53 }
54 G_filter.flushp = 0;
55 return 0;
56}
57
58static unsigned get_hz(void)
59{
60 static unsigned hz_internal;
61 FILE *fp;
62
63 if (hz_internal)
64 return hz_internal;
65
66 fp = fopen_for_read("/proc/net/psched");
67 if (fp) {
68 unsigned nom, denom;
69
70 if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
71 if (nom == 1000000)
72 hz_internal = denom;
73 fclose(fp);
74 }
75 if (!hz_internal)
76 hz_internal = sysconf(_SC_CLK_TCK);
77 return hz_internal;
78}
79
80static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
81 struct nlmsghdr *n, void *arg UNUSED_PARAM)
82{
83 struct rtmsg *r = NLMSG_DATA(n);
84 int len = n->nlmsg_len;
85 struct rtattr * tb[RTA_MAX+1];
86 char abuf[256];
87 inet_prefix dst;
88 inet_prefix src;
89 int host_len = -1;
90 SPRINT_BUF(b1);
91
92 if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
93 fprintf(stderr, "Not a route: %08x %08x %08x\n",
94 n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
95 return 0;
96 }
97 if (G_filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
98 return 0;
99 len -= NLMSG_LENGTH(sizeof(*r));
100 if (len < 0)
101 bb_error_msg_and_die("wrong nlmsg len %d", len);
102
103 if (r->rtm_family == AF_INET6)
104 host_len = 128;
105 else if (r->rtm_family == AF_INET)
106 host_len = 32;
107
108 if (r->rtm_family == AF_INET6) {
109 if (G_filter.tb) {
110 if (G_filter.tb < 0) {
111 if (!(r->rtm_flags & RTM_F_CLONED)) {
112 return 0;
113 }
114 } else {
115 if (r->rtm_flags & RTM_F_CLONED) {
116 return 0;
117 }
118 if (G_filter.tb == RT_TABLE_LOCAL) {
119 if (r->rtm_type != RTN_LOCAL) {
120 return 0;
121 }
122 } else if (G_filter.tb == RT_TABLE_MAIN) {
123 if (r->rtm_type == RTN_LOCAL) {
124 return 0;
125 }
126 } else {
127 return 0;
128 }
129 }
130 }
131 } else {
132 if (G_filter.tb > 0 && G_filter.tb != r->rtm_table) {
133 return 0;
134 }
135 }
136 if (G_filter.rdst.family
137 && (r->rtm_family != G_filter.rdst.family || G_filter.rdst.bitlen > r->rtm_dst_len)
138 ) {
139 return 0;
140 }
141 if (G_filter.mdst.family
142 && (r->rtm_family != G_filter.mdst.family
143 || (G_filter.mdst.bitlen >= 0 && G_filter.mdst.bitlen < r->rtm_dst_len)
144 )
145 ) {
146 return 0;
147 }
148 if (G_filter.rsrc.family
149 && (r->rtm_family != G_filter.rsrc.family || G_filter.rsrc.bitlen > r->rtm_src_len)
150 ) {
151 return 0;
152 }
153 if (G_filter.msrc.family
154 && (r->rtm_family != G_filter.msrc.family
155 || (G_filter.msrc.bitlen >= 0 && G_filter.msrc.bitlen < r->rtm_src_len)
156 )
157 ) {
158 return 0;
159 }
160
161 memset(tb, 0, sizeof(tb));
162 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
163
164 if (G_filter.rdst.family
165 && inet_addr_match(&dst, &G_filter.rdst, G_filter.rdst.bitlen)
166 ) {
167 return 0;
168 }
169 if (G_filter.mdst.family
170 && G_filter.mdst.bitlen >= 0
171 && inet_addr_match(&dst, &G_filter.mdst, r->rtm_dst_len)
172 ) {
173 return 0;
174 }
175 if (G_filter.rsrc.family
176 && inet_addr_match(&src, &G_filter.rsrc, G_filter.rsrc.bitlen)
177 ) {
178 return 0;
179 }
180 if (G_filter.msrc.family && G_filter.msrc.bitlen >= 0
181 && inet_addr_match(&src, &G_filter.msrc, r->rtm_src_len)
182 ) {
183 return 0;
184 }
185 if (G_filter.flushb
186 && r->rtm_family == AF_INET6
187 && r->rtm_dst_len == 0
188 && r->rtm_type == RTN_UNREACHABLE
189 && tb[RTA_PRIORITY]
190 && *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1
191 ) {
192 return 0;
193 }
194
195 if (G_filter.flushb) {
196 struct nlmsghdr *fn;
197 if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
198 if (flush_update())
199 bb_error_msg_and_die("flush");
200 }
201 fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
202 memcpy(fn, n, n->nlmsg_len);
203 fn->nlmsg_type = RTM_DELROUTE;
204 fn->nlmsg_flags = NLM_F_REQUEST;
205 fn->nlmsg_seq = ++G_filter.rth->seq;
206 G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
207 G_filter.flushed = 1;
208 return 0;
209 }
210
211 if (n->nlmsg_type == RTM_DELROUTE) {
212 printf("Deleted ");
213 }
214 if (r->rtm_type != RTN_UNICAST /* && !G_filter.type - always 0 */) {
215 printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1));
216 }
217
218 if (tb[RTA_DST]) {
219 if (r->rtm_dst_len != host_len) {
220 printf("%s/%u ", rt_addr_n2a(r->rtm_family,
221 RTA_DATA(tb[RTA_DST]),
222 abuf, sizeof(abuf)),
223 r->rtm_dst_len
224 );
225 } else {
226 printf("%s ", format_host(r->rtm_family,
227 RTA_PAYLOAD(tb[RTA_DST]),
228 RTA_DATA(tb[RTA_DST]),
229 abuf, sizeof(abuf))
230 );
231 }
232 } else if (r->rtm_dst_len) {
233 printf("0/%d ", r->rtm_dst_len);
234 } else {
235 printf("default ");
236 }
237 if (tb[RTA_SRC]) {
238 if (r->rtm_src_len != host_len) {
239 printf("from %s/%u ", rt_addr_n2a(r->rtm_family,
240 RTA_DATA(tb[RTA_SRC]),
241 abuf, sizeof(abuf)),
242 r->rtm_src_len
243 );
244 } else {
245 printf("from %s ", format_host(r->rtm_family,
246 RTA_PAYLOAD(tb[RTA_SRC]),
247 RTA_DATA(tb[RTA_SRC]),
248 abuf, sizeof(abuf))
249 );
250 }
251 } else if (r->rtm_src_len) {
252 printf("from 0/%u ", r->rtm_src_len);
253 }
254 if (tb[RTA_GATEWAY] && G_filter.rvia.bitlen != host_len) {
255 printf("via %s ", format_host(r->rtm_family,
256 RTA_PAYLOAD(tb[RTA_GATEWAY]),
257 RTA_DATA(tb[RTA_GATEWAY]),
258 abuf, sizeof(abuf)));
259 }
260 if (tb[RTA_OIF] && G_filter.oifmask != -1) {
261 printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
262 }
263
264 if (tb[RTA_PREFSRC] && /*G_filter.rprefsrc.bitlen - always 0*/ 0 != host_len) {
265 /* Do not use format_host(). It is our local addr
266 and symbolic name will not be useful.
267 */
268 printf(" src %s ", rt_addr_n2a(r->rtm_family,
269 RTA_DATA(tb[RTA_PREFSRC]),
270 abuf, sizeof(abuf)));
271 }
272 if (tb[RTA_PRIORITY]) {
273 printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
274 }
275 if (r->rtm_family == AF_INET6) {
276 struct rta_cacheinfo *ci = NULL;
277 if (tb[RTA_CACHEINFO]) {
278 ci = RTA_DATA(tb[RTA_CACHEINFO]);
279 }
280 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
281 if (r->rtm_flags & RTM_F_CLONED) {
282 printf("%c cache ", _SL_);
283 }
284 if (ci->rta_expires) {
285 printf(" expires %dsec", ci->rta_expires / get_hz());
286 }
287 if (ci->rta_error != 0) {
288 printf(" error %d", ci->rta_error);
289 }
290 } else if (ci) {
291 if (ci->rta_error != 0)
292 printf(" error %d", ci->rta_error);
293 }
294 }
295 if (tb[RTA_IIF] && G_filter.iifmask != -1) {
296 printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
297 }
298 bb_putchar('\n');
299 return 0;
300}
301
302/* Return value becomes exitcode. It's okay to not return at all */
303static int iproute_modify(int cmd, unsigned flags, char **argv)
304{
305 static const char keywords[] ALIGN1 =
306 "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0")
307 "dev\0""oif\0""to\0""metric\0";
308 enum {
309 ARG_src,
310 ARG_via,
311 ARG_mtu, PARM_lock,
312 ARG_protocol,
313IF_FEATURE_IP_RULE(ARG_table,)
314 ARG_dev,
315 ARG_oif,
316 ARG_to,
317 ARG_metric,
318 };
319 enum {
320 gw_ok = 1 << 0,
321 dst_ok = 1 << 1,
322 proto_ok = 1 << 2,
323 type_ok = 1 << 3
324 };
325 struct rtnl_handle rth;
326 struct {
327 struct nlmsghdr n;
328 struct rtmsg r;
329 char buf[1024];
330 } req;
331 char mxbuf[256];
332 struct rtattr * mxrta = (void*)mxbuf;
333 unsigned mxlock = 0;
334 char *d = NULL;
335 smalluint ok = 0;
336 int arg;
337
338 memset(&req, 0, sizeof(req));
339
340 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
341 req.n.nlmsg_flags = NLM_F_REQUEST | flags;
342 req.n.nlmsg_type = cmd;
343 req.r.rtm_family = preferred_family;
344 if (RT_TABLE_MAIN) /* if it is zero, memset already did it */
345 req.r.rtm_table = RT_TABLE_MAIN;
346 if (RT_SCOPE_NOWHERE)
347 req.r.rtm_scope = RT_SCOPE_NOWHERE;
348
349 if (cmd != RTM_DELROUTE) {
350 req.r.rtm_protocol = RTPROT_BOOT;
351 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
352 req.r.rtm_type = RTN_UNICAST;
353 }
354
355 mxrta->rta_type = RTA_METRICS;
356 mxrta->rta_len = RTA_LENGTH(0);
357
358 while (*argv) {
359 arg = index_in_substrings(keywords, *argv);
360 if (arg == ARG_src) {
361 inet_prefix addr;
362 NEXT_ARG();
363 get_addr(&addr, *argv, req.r.rtm_family);
364 if (req.r.rtm_family == AF_UNSPEC)
365 req.r.rtm_family = addr.family;
366 addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
367 } else if (arg == ARG_via) {
368 inet_prefix addr;
369 ok |= gw_ok;
370 NEXT_ARG();
371 get_addr(&addr, *argv, req.r.rtm_family);
372 if (req.r.rtm_family == AF_UNSPEC) {
373 req.r.rtm_family = addr.family;
374 }
375 addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
376 } else if (arg == ARG_mtu) {
377 unsigned mtu;
378 NEXT_ARG();
379 if (index_in_strings(keywords, *argv) == PARM_lock) {
380 mxlock |= (1 << RTAX_MTU);
381 NEXT_ARG();
382 }
383 mtu = get_unsigned(*argv, "mtu");
384 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
385 } else if (arg == ARG_protocol) {
386 uint32_t prot;
387 NEXT_ARG();
388 if (rtnl_rtprot_a2n(&prot, *argv))
389 invarg(*argv, "protocol");
390 req.r.rtm_protocol = prot;
391 ok |= proto_ok;
392#if ENABLE_FEATURE_IP_RULE
393 } else if (arg == ARG_table) {
394 uint32_t tid;
395 NEXT_ARG();
396 if (rtnl_rttable_a2n(&tid, *argv))
397 invarg(*argv, "table");
398 req.r.rtm_table = tid;
399#endif
400 } else if (arg == ARG_dev || arg == ARG_oif) {
401 NEXT_ARG();
402 d = *argv;
403 } else if (arg == ARG_metric) {
404 uint32_t metric;
405 NEXT_ARG();
406 metric = get_u32(*argv, "metric");
407 addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
408 } else {
409 int type;
410 inet_prefix dst;
411
412 if (arg == ARG_to) {
413 NEXT_ARG();
414 }
415 if ((**argv < '0' || **argv > '9')
416 && rtnl_rtntype_a2n(&type, *argv) == 0) {
417 NEXT_ARG();
418 req.r.rtm_type = type;
419 ok |= type_ok;
420 }
421
422 if (ok & dst_ok) {
423 duparg2("to", *argv);
424 }
425 get_prefix(&dst, *argv, req.r.rtm_family);
426 if (req.r.rtm_family == AF_UNSPEC) {
427 req.r.rtm_family = dst.family;
428 }
429 req.r.rtm_dst_len = dst.bitlen;
430 ok |= dst_ok;
431 if (dst.bytelen) {
432 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
433 }
434 }
435 argv++;
436 }
437
438 xrtnl_open(&rth);
439
440 if (d) {
441 int idx;
442
443 ll_init_map(&rth);
444
445 if (d) {
446 idx = xll_name_to_index(d);
447 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
448 }
449 }
450
451 if (mxrta->rta_len > RTA_LENGTH(0)) {
452 if (mxlock) {
453 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
454 }
455 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
456 }
457
458 if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
459 req.r.rtm_scope = RT_SCOPE_HOST;
460 else
461 if (req.r.rtm_type == RTN_BROADCAST
462 || req.r.rtm_type == RTN_MULTICAST
463 || req.r.rtm_type == RTN_ANYCAST
464 ) {
465 req.r.rtm_scope = RT_SCOPE_LINK;
466 }
467 else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
468 if (cmd == RTM_DELROUTE)
469 req.r.rtm_scope = RT_SCOPE_NOWHERE;
470 else if (!(ok & gw_ok))
471 req.r.rtm_scope = RT_SCOPE_LINK;
472 }
473
474 if (req.r.rtm_family == AF_UNSPEC) {
475 req.r.rtm_family = AF_INET;
476 }
477
478 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
479 return 2;
480 }
481
482 return 0;
483}
484
485static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
486{
487 struct {
488 struct nlmsghdr nlh;
489 struct rtmsg rtm;
490 } req;
491 struct sockaddr_nl nladdr;
492
493 memset(&nladdr, 0, sizeof(nladdr));
494 memset(&req, 0, sizeof(req));
495 nladdr.nl_family = AF_NETLINK;
496
497 req.nlh.nlmsg_len = sizeof(req);
498 if (RTM_GETROUTE)
499 req.nlh.nlmsg_type = RTM_GETROUTE;
500 if (NLM_F_ROOT | NLM_F_REQUEST)
501 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
502 /*req.nlh.nlmsg_pid = 0; - memset did it already */
503 req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
504 req.rtm.rtm_family = family;
505 if (RTM_F_CLONED)
506 req.rtm.rtm_flags = RTM_F_CLONED;
507
508 return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
509}
510
511static void iproute_flush_cache(void)
512{
513 static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
514 int flush_fd = open_or_warn(fn, O_WRONLY);
515
516 if (flush_fd < 0) {
517 return;
518 }
519
520 if (write(flush_fd, "-1", 2) < 2) {
521 bb_perror_msg("can't flush routing cache");
522 return;
523 }
524 close(flush_fd);
525}
526
527static void iproute_reset_filter(void)
528{
529 memset(&G_filter, 0, sizeof(G_filter));
530 G_filter.mdst.bitlen = -1;
531 G_filter.msrc.bitlen = -1;
532}
533
534/* Return value becomes exitcode. It's okay to not return at all */
535static int iproute_list_or_flush(char **argv, int flush)
536{
537 int do_ipv6 = preferred_family;
538 struct rtnl_handle rth;
539 char *id = NULL;
540 char *od = NULL;
541 static const char keywords[] ALIGN1 =
542 /* "ip route list/flush" parameters: */
543 "protocol\0" "dev\0" "oif\0" "iif\0"
544 "via\0" "table\0" "cache\0"
545 "from\0" "to\0"
546 /* and possible further keywords */
547 "all\0"
548 "root\0"
549 "match\0"
550 "exact\0"
551 "main\0"
552 ;
553 enum {
554 KW_proto, KW_dev, KW_oif, KW_iif,
555 KW_via, KW_table, KW_cache,
556 KW_from, KW_to,
557 /* */
558 KW_all,
559 KW_root,
560 KW_match,
561 KW_exact,
562 KW_main,
563 };
564 int arg, parm;
565
566 iproute_reset_filter();
567 G_filter.tb = RT_TABLE_MAIN;
568
569 if (flush && !*argv)
570 bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
571
572 while (*argv) {
573 arg = index_in_substrings(keywords, *argv);
574 if (arg == KW_proto) {
575 uint32_t prot = 0;
576 NEXT_ARG();
577 //G_filter.protocolmask = -1;
578 if (rtnl_rtprot_a2n(&prot, *argv)) {
579 if (index_in_strings(keywords, *argv) != KW_all)
580 invarg(*argv, "protocol");
581 prot = 0;
582 //G_filter.protocolmask = 0;
583 }
584 //G_filter.protocol = prot;
585 } else if (arg == KW_dev || arg == KW_oif) {
586 NEXT_ARG();
587 od = *argv;
588 } else if (arg == KW_iif) {
589 NEXT_ARG();
590 id = *argv;
591 } else if (arg == KW_via) {
592 NEXT_ARG();
593 get_prefix(&G_filter.rvia, *argv, do_ipv6);
594 } else if (arg == KW_table) { /* table all/cache/main */
595 NEXT_ARG();
596 parm = index_in_substrings(keywords, *argv);
597 if (parm == KW_cache)
598 G_filter.tb = -1;
599 else if (parm == KW_all)
600 G_filter.tb = 0;
601 else if (parm != KW_main) {
602#if ENABLE_FEATURE_IP_RULE
603 uint32_t tid;
604 if (rtnl_rttable_a2n(&tid, *argv))
605 invarg(*argv, "table");
606 G_filter.tb = tid;
607#else
608 invarg(*argv, "table");
609#endif
610 }
611 } else if (arg == KW_cache) {
612 /* The command 'ip route flush cache' is used by OpenSWAN.
613 * Assuming it's a synonym for 'ip route flush table cache' */
614 G_filter.tb = -1;
615 } else if (arg == KW_from) {
616 NEXT_ARG();
617 parm = index_in_substrings(keywords, *argv);
618 if (parm == KW_root) {
619 NEXT_ARG();
620 get_prefix(&G_filter.rsrc, *argv, do_ipv6);
621 } else if (parm == KW_match) {
622 NEXT_ARG();
623 get_prefix(&G_filter.msrc, *argv, do_ipv6);
624 } else {
625 if (parm == KW_exact)
626 NEXT_ARG();
627 get_prefix(&G_filter.msrc, *argv, do_ipv6);
628 G_filter.rsrc = G_filter.msrc;
629 }
630 } else { /* "to" is the default parameter */
631 if (arg == KW_to) {
632 NEXT_ARG();
633 arg = index_in_substrings(keywords, *argv);
634 }
635 /* parm = arg; - would be more plausible, but we reuse 'arg' here */
636 if (arg == KW_root) {
637 NEXT_ARG();
638 get_prefix(&G_filter.rdst, *argv, do_ipv6);
639 } else if (arg == KW_match) {
640 NEXT_ARG();
641 get_prefix(&G_filter.mdst, *argv, do_ipv6);
642 } else { /* "to exact" is the default */
643 if (arg == KW_exact)
644 NEXT_ARG();
645 get_prefix(&G_filter.mdst, *argv, do_ipv6);
646 G_filter.rdst = G_filter.mdst;
647 }
648 }
649 argv++;
650 }
651
652 if (do_ipv6 == AF_UNSPEC && G_filter.tb) {
653 do_ipv6 = AF_INET;
654 }
655
656 xrtnl_open(&rth);
657 ll_init_map(&rth);
658
659 if (id || od) {
660 int idx;
661
662 if (id) {
663 idx = xll_name_to_index(id);
664 G_filter.iif = idx;
665 G_filter.iifmask = -1;
666 }
667 if (od) {
668 idx = xll_name_to_index(od);
669 G_filter.oif = idx;
670 G_filter.oifmask = -1;
671 }
672 }
673
674 if (flush) {
675 char flushb[4096-512];
676
677 if (G_filter.tb == -1) { /* "flush table cache" */
678 if (do_ipv6 != AF_INET6)
679 iproute_flush_cache();
680 if (do_ipv6 == AF_INET)
681 return 0;
682 }
683
684 G_filter.flushb = flushb;
685 G_filter.flushp = 0;
686 G_filter.flushe = sizeof(flushb);
687 G_filter.rth = &rth;
688
689 for (;;) {
690 xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
691 G_filter.flushed = 0;
692 xrtnl_dump_filter(&rth, print_route, NULL);
693 if (G_filter.flushed == 0)
694 return 0;
695 if (flush_update())
696 return 1;
697 }
698 }
699
700 if (G_filter.tb != -1) {
701 xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
702 } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
703 bb_perror_msg_and_die("can't send dump request");
704 }
705 xrtnl_dump_filter(&rth, print_route, NULL);
706
707 return 0;
708}
709
710
711/* Return value becomes exitcode. It's okay to not return at all */
712static int iproute_get(char **argv)
713{
714 struct rtnl_handle rth;
715 struct {
716 struct nlmsghdr n;
717 struct rtmsg r;
718 char buf[1024];
719 } req;
720 char *idev = NULL;
721 char *odev = NULL;
722 bool connected = 0;
723 bool from_ok = 0;
724 static const char options[] ALIGN1 =
725 "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
726
727 memset(&req, 0, sizeof(req));
728
729 iproute_reset_filter();
730
731 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
732 if (NLM_F_REQUEST)
733 req.n.nlmsg_flags = NLM_F_REQUEST;
734 if (RTM_GETROUTE)
735 req.n.nlmsg_type = RTM_GETROUTE;
736 req.r.rtm_family = preferred_family;
737 /*req.r.rtm_table = 0; - memset did this already */
738 /*req.r.rtm_protocol = 0;*/
739 /*req.r.rtm_scope = 0;*/
740 /*req.r.rtm_type = 0;*/
741 /*req.r.rtm_src_len = 0;*/
742 /*req.r.rtm_dst_len = 0;*/
743 /*req.r.rtm_tos = 0;*/
744
745 while (*argv) {
746 switch (index_in_strings(options, *argv)) {
747 case 0: /* from */
748 {
749 inet_prefix addr;
750 NEXT_ARG();
751 from_ok = 1;
752 get_prefix(&addr, *argv, req.r.rtm_family);
753 if (req.r.rtm_family == AF_UNSPEC) {
754 req.r.rtm_family = addr.family;
755 }
756 if (addr.bytelen) {
757 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
758 }
759 req.r.rtm_src_len = addr.bitlen;
760 break;
761 }
762 case 1: /* iif */
763 NEXT_ARG();
764 idev = *argv;
765 break;
766 case 2: /* oif */
767 case 3: /* dev */
768 NEXT_ARG();
769 odev = *argv;
770 break;
771 case 4: /* notify */
772 req.r.rtm_flags |= RTM_F_NOTIFY;
773 break;
774 case 5: /* connected */
775 connected = 1;
776 break;
777 case 6: /* to */
778 NEXT_ARG();
779 default:
780 {
781 inet_prefix addr;
782 get_prefix(&addr, *argv, req.r.rtm_family);
783 if (req.r.rtm_family == AF_UNSPEC) {
784 req.r.rtm_family = addr.family;
785 }
786 if (addr.bytelen) {
787 addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
788 }
789 req.r.rtm_dst_len = addr.bitlen;
790 }
791 }
792 argv++;
793 }
794
795 if (req.r.rtm_dst_len == 0) {
796 bb_error_msg_and_die("need at least destination address");
797 }
798
799 xrtnl_open(&rth);
800
801 ll_init_map(&rth);
802
803 if (idev || odev) {
804 int idx;
805
806 if (idev) {
807 idx = xll_name_to_index(idev);
808 addattr32(&req.n, sizeof(req), RTA_IIF, idx);
809 }
810 if (odev) {
811 idx = xll_name_to_index(odev);
812 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
813 }
814 }
815
816 if (req.r.rtm_family == AF_UNSPEC) {
817 req.r.rtm_family = AF_INET;
818 }
819
820 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
821 return 2;
822 }
823
824 if (connected && !from_ok) {
825 struct rtmsg *r = NLMSG_DATA(&req.n);
826 int len = req.n.nlmsg_len;
827 struct rtattr * tb[RTA_MAX+1];
828
829 print_route(NULL, &req.n, NULL);
830
831 if (req.n.nlmsg_type != RTM_NEWROUTE) {
832 bb_error_msg_and_die("not a route?");
833 }
834 len -= NLMSG_LENGTH(sizeof(*r));
835 if (len < 0) {
836 bb_error_msg_and_die("wrong len %d", len);
837 }
838
839 memset(tb, 0, sizeof(tb));
840 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
841
842 if (tb[RTA_PREFSRC]) {
843 tb[RTA_PREFSRC]->rta_type = RTA_SRC;
844 r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
845 } else if (!tb[RTA_SRC]) {
846 bb_error_msg_and_die("can't connect the route");
847 }
848 if (!odev && tb[RTA_OIF]) {
849 tb[RTA_OIF]->rta_type = 0;
850 }
851 if (tb[RTA_GATEWAY]) {
852 tb[RTA_GATEWAY]->rta_type = 0;
853 }
854 if (!idev && tb[RTA_IIF]) {
855 tb[RTA_IIF]->rta_type = 0;
856 }
857 req.n.nlmsg_flags = NLM_F_REQUEST;
858 req.n.nlmsg_type = RTM_GETROUTE;
859
860 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
861 return 2;
862 }
863 }
864 print_route(NULL, &req.n, NULL);
865 return 0;
866}
867
868/* Return value becomes exitcode. It's okay to not return at all */
869int FAST_FUNC do_iproute(char **argv)
870{
871 static const char ip_route_commands[] ALIGN1 =
872 /*0-3*/ "add\0""append\0""change\0""chg\0"
873 /*4-7*/ "delete\0""get\0""list\0""show\0"
874 /*8..*/ "prepend\0""replace\0""test\0""flush\0";
875 int command_num;
876 unsigned flags = 0;
877 int cmd = RTM_NEWROUTE;
878
879 if (!*argv)
880 return iproute_list_or_flush(argv, 0);
881
882 /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
883 /* It probably means that it is using "first match" rule */
884 command_num = index_in_substrings(ip_route_commands, *argv);
885
886 switch (command_num) {
887 case 0: /* add */
888 flags = NLM_F_CREATE|NLM_F_EXCL;
889 break;
890 case 1: /* append */
891 flags = NLM_F_CREATE|NLM_F_APPEND;
892 break;
893 case 2: /* change */
894 case 3: /* chg */
895 flags = NLM_F_REPLACE;
896 break;
897 case 4: /* delete */
898 cmd = RTM_DELROUTE;
899 break;
900 case 5: /* get */
901 return iproute_get(argv+1);
902 case 6: /* list */
903 case 7: /* show */
904 return iproute_list_or_flush(argv+1, 0);
905 case 8: /* prepend */
906 flags = NLM_F_CREATE;
907 break;
908 case 9: /* replace */
909 flags = NLM_F_CREATE|NLM_F_REPLACE;
910 break;
911 case 10: /* test */
912 flags = NLM_F_EXCL;
913 break;
914 case 11: /* flush */
915 return iproute_list_or_flush(argv+1, 1);
916 default:
917 bb_error_msg_and_die("unknown command %s", *argv);
918 }
919
920 return iproute_modify(cmd, flags, argv+1);
921}
Note: See TracBrowser for help on using the repository browser.