1 /*
2 * iproute.c "ip route".
3 *
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.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include <unistd.h>
16 #include <syslog.h>
17 #include <fcntl.h>
18 #include <string.h>
19 #include <time.h>
20 #include <sys/time.h>
21 #include <sys/socket.h>
22 #include <netinet/in.h>
23 #include <netinet/ip.h>
24 #include <arpa/inet.h>
25 #include <linux/in_route.h>
26 #include <errno.h>
27
28 #include "rt_names.h"
29 #include "utils.h"
30 #include "ip_common.h"
31
32 #ifndef RTAX_RTTVAR
33 #define RTAX_RTTVAR RTAX_HOPS
34 #endif
35
36 enum list_action {
37 IPROUTE_LIST,
38 IPROUTE_FLUSH,
39 IPROUTE_SAVE,
40 };
41 static const char *mx_names[RTAX_MAX+1] = {
42 [RTAX_MTU] = "mtu",
43 [RTAX_WINDOW] = "window",
44 [RTAX_RTT] = "rtt",
45 [RTAX_RTTVAR] = "rttvar",
46 [RTAX_SSTHRESH] = "ssthresh",
47 [RTAX_CWND] = "cwnd",
48 [RTAX_ADVMSS] = "advmss",
49 [RTAX_REORDERING]="reordering",
50 [RTAX_HOPLIMIT] = "hoplimit",
51 [RTAX_INITCWND] = "initcwnd",
52 [RTAX_FEATURES] = "features",
53 [RTAX_RTO_MIN] = "rto_min",
54 [RTAX_INITRWND] = "initrwnd",
55 };
56 static void usage(void) __attribute__((noreturn));
57
usage(void)58 static void usage(void)
59 {
60 fprintf(stderr, "Usage: ip route { list | flush } SELECTOR\n");
61 fprintf(stderr, " ip route save SELECTOR\n");
62 fprintf(stderr, " ip route restore\n");
63 fprintf(stderr, " ip route get ADDRESS [ from ADDRESS iif STRING ]\n");
64 fprintf(stderr, " [ oif STRING ] [ tos TOS ]\n");
65 fprintf(stderr, " [ mark NUMBER ] [ uid NUMBER ]\n");
66 fprintf(stderr, " ip route { add | del | change | append | replace } ROUTE\n");
67 fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
68 fprintf(stderr, " [ table TABLE_ID ] [ proto RTPROTO ]\n");
69 fprintf(stderr, " [ type TYPE ] [ scope SCOPE ]\n");
70 fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
71 fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
72 fprintf(stderr, " [ table TABLE_ID ] [ proto RTPROTO ]\n");
73 fprintf(stderr, " [ scope SCOPE ] [ metric METRIC ]\n");
74 fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
75 fprintf(stderr, "NH := [ via ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
76 fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ]\n");
77 fprintf(stderr, " [ rtt TIME ] [ rttvar TIME ] [reordering NUMBER ]\n");
78 fprintf(stderr, " [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
79 fprintf(stderr, " [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
80 fprintf(stderr, " [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n");
81 fprintf(stderr, "TYPE := [ unicast | local | broadcast | multicast | throw |\n");
82 fprintf(stderr, " unreachable | prohibit | blackhole | nat ]\n");
83 fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
84 fprintf(stderr, "SCOPE := [ host | link | global | NUMBER ]\n");
85 fprintf(stderr, "MP_ALGO := { rr | drr | random | wrandom }\n");
86 fprintf(stderr, "NHFLAGS := [ onlink | pervasive ]\n");
87 fprintf(stderr, "RTPROTO := [ kernel | boot | static | NUMBER ]\n");
88 fprintf(stderr, "TIME := NUMBER[s|ms]\n");
89 exit(-1);
90 }
91
92
93 static struct
94 {
95 int tb;
96 int cloned;
97 int flushed;
98 char *flushb;
99 int flushp;
100 int flushe;
101 int protocol, protocolmask;
102 int scope, scopemask;
103 int type, typemask;
104 int tos, tosmask;
105 int iif, iifmask;
106 int oif, oifmask;
107 int mark, markmask;
108 int realm, realmmask;
109 inet_prefix rprefsrc;
110 inet_prefix rvia;
111 inet_prefix rdst;
112 inet_prefix mdst;
113 inet_prefix rsrc;
114 inet_prefix msrc;
115 } filter;
116
flush_update(void)117 static int flush_update(void)
118 {
119 if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
120 perror("Failed to send flush request");
121 return -1;
122 }
123 filter.flushp = 0;
124 return 0;
125 }
126
filter_nlmsg(struct nlmsghdr * n,struct rtattr ** tb,int host_len)127 int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
128 {
129 struct rtmsg *r = NLMSG_DATA(n);
130 inet_prefix dst;
131 inet_prefix src;
132 inet_prefix via;
133 inet_prefix prefsrc;
134 __u32 table;
135 static int ip6_multiple_tables;
136
137 table = rtm_get_table(r, tb);
138
139 if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
140 ip6_multiple_tables = 1;
141
142 if (filter.cloned == !(r->rtm_flags&RTM_F_CLONED))
143 return 0;
144
145 if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
146 if (filter.tb) {
147 if (filter.tb == RT_TABLE_LOCAL) {
148 if (r->rtm_type != RTN_LOCAL)
149 return 0;
150 } else if (filter.tb == RT_TABLE_MAIN) {
151 if (r->rtm_type == RTN_LOCAL)
152 return 0;
153 } else {
154 return 0;
155 }
156 }
157 } else {
158 if (filter.tb > 0 && filter.tb != table)
159 return 0;
160 }
161 if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
162 return 0;
163 if ((filter.scope^r->rtm_scope)&filter.scopemask)
164 return 0;
165 if ((filter.type^r->rtm_type)&filter.typemask)
166 return 0;
167 if ((filter.tos^r->rtm_tos)&filter.tosmask)
168 return 0;
169 if (filter.rdst.family &&
170 (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len))
171 return 0;
172 if (filter.mdst.family &&
173 (r->rtm_family != filter.mdst.family ||
174 (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len)))
175 return 0;
176 if (filter.rsrc.family &&
177 (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len))
178 return 0;
179 if (filter.msrc.family &&
180 (r->rtm_family != filter.msrc.family ||
181 (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len)))
182 return 0;
183 if (filter.rvia.family && r->rtm_family != filter.rvia.family)
184 return 0;
185 if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
186 return 0;
187
188 memset(&dst, 0, sizeof(dst));
189 dst.family = r->rtm_family;
190 if (tb[RTA_DST])
191 memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
192 if (filter.rsrc.family || filter.msrc.family) {
193 memset(&src, 0, sizeof(src));
194 src.family = r->rtm_family;
195 if (tb[RTA_SRC])
196 memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
197 }
198 if (filter.rvia.bitlen>0) {
199 memset(&via, 0, sizeof(via));
200 via.family = r->rtm_family;
201 if (tb[RTA_GATEWAY])
202 memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
203 }
204 if (filter.rprefsrc.bitlen>0) {
205 memset(&prefsrc, 0, sizeof(prefsrc));
206 prefsrc.family = r->rtm_family;
207 if (tb[RTA_PREFSRC])
208 memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
209 }
210
211 if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
212 return 0;
213 if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
214 inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
215 return 0;
216
217 if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
218 return 0;
219 if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
220 inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
221 return 0;
222
223 if (filter.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
224 return 0;
225 if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
226 return 0;
227 if (filter.realmmask) {
228 __u32 realms = 0;
229 if (tb[RTA_FLOW])
230 realms = rta_getattr_u32(tb[RTA_FLOW]);
231 if ((realms^filter.realm)&filter.realmmask)
232 return 0;
233 }
234 if (filter.iifmask) {
235 int iif = 0;
236 if (tb[RTA_IIF])
237 iif = *(int*)RTA_DATA(tb[RTA_IIF]);
238 if ((iif^filter.iif)&filter.iifmask)
239 return 0;
240 }
241 if (filter.oifmask) {
242 int oif = 0;
243 if (tb[RTA_OIF])
244 oif = *(int*)RTA_DATA(tb[RTA_OIF]);
245 if ((oif^filter.oif)&filter.oifmask)
246 return 0;
247 }
248 if (filter.markmask) {
249 int mark = 0;
250 if (tb[RTA_MARK])
251 mark = *(int *)RTA_DATA(tb[RTA_MARK]);
252 if ((mark ^ filter.mark) & filter.markmask)
253 return 0;
254 }
255 if (filter.flushb &&
256 r->rtm_family == AF_INET6 &&
257 r->rtm_dst_len == 0 &&
258 r->rtm_type == RTN_UNREACHABLE &&
259 tb[RTA_PRIORITY] &&
260 *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
261 return 0;
262
263 return 1;
264 }
265
calc_host_len(struct rtmsg * r)266 int calc_host_len(struct rtmsg *r)
267 {
268 if (r->rtm_family == AF_INET6)
269 return 128;
270 else if (r->rtm_family == AF_INET)
271 return 32;
272 else if (r->rtm_family == AF_DECnet)
273 return 16;
274 else if (r->rtm_family == AF_IPX)
275 return 80;
276 else
277 return -1;
278 }
279
print_route(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)280 int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
281 {
282 FILE *fp = (FILE*)arg;
283 struct rtmsg *r = NLMSG_DATA(n);
284 int len = n->nlmsg_len;
285 struct rtattr * tb[RTA_MAX+1];
286 char abuf[256];
287 int host_len = -1;
288 __u32 table;
289 SPRINT_BUF(b1);
290 static int hz;
291
292 if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
293 fprintf(stderr, "Not a route: %08x %08x %08x\n",
294 n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
295 return 0;
296 }
297 if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
298 return 0;
299 len -= NLMSG_LENGTH(sizeof(*r));
300 if (len < 0) {
301 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
302 return -1;
303 }
304
305 host_len = calc_host_len(r);
306
307 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
308 table = rtm_get_table(r, tb);
309
310 if (!filter_nlmsg(n, tb, host_len))
311 return 0;
312
313 if (filter.flushb) {
314 struct nlmsghdr *fn;
315 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
316 if (flush_update())
317 return -1;
318 }
319 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
320 memcpy(fn, n, n->nlmsg_len);
321 fn->nlmsg_type = RTM_DELROUTE;
322 fn->nlmsg_flags = NLM_F_REQUEST;
323 fn->nlmsg_seq = ++rth.seq;
324 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
325 filter.flushed++;
326 if (show_stats < 2)
327 return 0;
328 }
329
330 if (n->nlmsg_type == RTM_DELROUTE)
331 fprintf(fp, "Deleted ");
332 if (r->rtm_type != RTN_UNICAST && !filter.type)
333 fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
334
335 if (tb[RTA_DST]) {
336 if (r->rtm_dst_len != host_len) {
337 fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
338 RTA_PAYLOAD(tb[RTA_DST]),
339 RTA_DATA(tb[RTA_DST]),
340 abuf, sizeof(abuf)),
341 r->rtm_dst_len
342 );
343 } else {
344 fprintf(fp, "%s ", format_host(r->rtm_family,
345 RTA_PAYLOAD(tb[RTA_DST]),
346 RTA_DATA(tb[RTA_DST]),
347 abuf, sizeof(abuf))
348 );
349 }
350 } else if (r->rtm_dst_len) {
351 fprintf(fp, "0/%d ", r->rtm_dst_len);
352 } else {
353 fprintf(fp, "default ");
354 }
355 if (tb[RTA_SRC]) {
356 if (r->rtm_src_len != host_len) {
357 fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
358 RTA_PAYLOAD(tb[RTA_SRC]),
359 RTA_DATA(tb[RTA_SRC]),
360 abuf, sizeof(abuf)),
361 r->rtm_src_len
362 );
363 } else {
364 fprintf(fp, "from %s ", format_host(r->rtm_family,
365 RTA_PAYLOAD(tb[RTA_SRC]),
366 RTA_DATA(tb[RTA_SRC]),
367 abuf, sizeof(abuf))
368 );
369 }
370 } else if (r->rtm_src_len) {
371 fprintf(fp, "from 0/%u ", r->rtm_src_len);
372 }
373 if (r->rtm_tos && filter.tosmask != -1) {
374 SPRINT_BUF(b1);
375 fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
376 }
377
378 if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
379 fprintf(fp, "via %s ",
380 format_host(r->rtm_family,
381 RTA_PAYLOAD(tb[RTA_GATEWAY]),
382 RTA_DATA(tb[RTA_GATEWAY]),
383 abuf, sizeof(abuf)));
384 }
385 if (tb[RTA_OIF] && filter.oifmask != -1)
386 fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
387
388 if (!(r->rtm_flags&RTM_F_CLONED)) {
389 if (table != RT_TABLE_MAIN && !filter.tb)
390 fprintf(fp, " table %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
391 if (r->rtm_protocol != RTPROT_BOOT && filter.protocolmask != -1)
392 fprintf(fp, " proto %s ", rtnl_rtprot_n2a(r->rtm_protocol, b1, sizeof(b1)));
393 if (r->rtm_scope != RT_SCOPE_UNIVERSE && filter.scopemask != -1)
394 fprintf(fp, " scope %s ", rtnl_rtscope_n2a(r->rtm_scope, b1, sizeof(b1)));
395 }
396 if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
397 /* Do not use format_host(). It is our local addr
398 and symbolic name will not be useful.
399 */
400 fprintf(fp, " src %s ",
401 rt_addr_n2a(r->rtm_family,
402 RTA_PAYLOAD(tb[RTA_PREFSRC]),
403 RTA_DATA(tb[RTA_PREFSRC]),
404 abuf, sizeof(abuf)));
405 }
406 if (tb[RTA_PRIORITY])
407 fprintf(fp, " metric %u ", rta_getattr_u32(tb[RTA_PRIORITY]));
408 if (r->rtm_flags & RTNH_F_DEAD)
409 fprintf(fp, "dead ");
410 if (r->rtm_flags & RTNH_F_ONLINK)
411 fprintf(fp, "onlink ");
412 if (r->rtm_flags & RTNH_F_PERVASIVE)
413 fprintf(fp, "pervasive ");
414 if (r->rtm_flags & RTM_F_NOTIFY)
415 fprintf(fp, "notify ");
416 if (tb[RTA_MARK]) {
417 unsigned int mark = *(unsigned int*)RTA_DATA(tb[RTA_MARK]);
418 if (mark) {
419 if (mark >= 16)
420 fprintf(fp, " mark 0x%x", mark);
421 else
422 fprintf(fp, " mark %u", mark);
423 }
424 }
425
426 if (tb[RTA_UID])
427 fprintf(fp, " uid %u ", rta_getattr_u32(tb[RTA_UID]));
428
429 if (tb[RTA_FLOW] && filter.realmmask != ~0U) {
430 __u32 to = rta_getattr_u32(tb[RTA_FLOW]);
431 __u32 from = to>>16;
432 to &= 0xFFFF;
433 fprintf(fp, "realm%s ", from ? "s" : "");
434 if (from) {
435 fprintf(fp, "%s/",
436 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
437 }
438 fprintf(fp, "%s ",
439 rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
440 }
441 if ((r->rtm_flags&RTM_F_CLONED) && r->rtm_family == AF_INET) {
442 __u32 flags = r->rtm_flags&~0xFFFF;
443 int first = 1;
444
445 fprintf(fp, "%s cache ", _SL_);
446
447 #define PRTFL(fl,flname) if (flags&RTCF_##fl) { \
448 flags &= ~RTCF_##fl; \
449 fprintf(fp, "%s" flname "%s", first ? "<" : "", flags ? "," : "> "); \
450 first = 0; }
451 PRTFL(LOCAL, "local");
452 PRTFL(REJECT, "reject");
453 PRTFL(MULTICAST, "mc");
454 PRTFL(BROADCAST, "brd");
455 PRTFL(DNAT, "dst-nat");
456 PRTFL(SNAT, "src-nat");
457 PRTFL(MASQ, "masq");
458 PRTFL(DIRECTDST, "dst-direct");
459 PRTFL(DIRECTSRC, "src-direct");
460 PRTFL(REDIRECTED, "redirected");
461 PRTFL(DOREDIRECT, "redirect");
462 PRTFL(FAST, "fastroute");
463 PRTFL(NOTIFY, "notify");
464 PRTFL(TPROXY, "proxy");
465
466 if (flags)
467 fprintf(fp, "%s%x> ", first ? "<" : "", flags);
468 if (tb[RTA_CACHEINFO]) {
469 struct rta_cacheinfo *ci = RTA_DATA(tb[RTA_CACHEINFO]);
470 if (!hz)
471 hz = get_user_hz();
472 if (ci->rta_expires != 0)
473 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
474 if (ci->rta_error != 0)
475 fprintf(fp, " error %d", ci->rta_error);
476 if (show_stats) {
477 if (ci->rta_clntref)
478 fprintf(fp, " users %d", ci->rta_clntref);
479 if (ci->rta_used != 0)
480 fprintf(fp, " used %d", ci->rta_used);
481 if (ci->rta_lastuse != 0)
482 fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
483 }
484 if (ci->rta_id)
485 fprintf(fp, " ipid 0x%04x", ci->rta_id);
486 if (ci->rta_ts || ci->rta_tsage)
487 fprintf(fp, " ts 0x%x tsage %dsec",
488 ci->rta_ts, ci->rta_tsage);
489 }
490 } else if (r->rtm_family == AF_INET6) {
491 struct rta_cacheinfo *ci = NULL;
492 if (tb[RTA_CACHEINFO])
493 ci = RTA_DATA(tb[RTA_CACHEINFO]);
494 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
495 if (!hz)
496 hz = get_user_hz();
497 if (r->rtm_flags & RTM_F_CLONED)
498 fprintf(fp, "%s cache ", _SL_);
499 if (ci->rta_expires)
500 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
501 if (ci->rta_error != 0)
502 fprintf(fp, " error %d", ci->rta_error);
503 if (show_stats) {
504 if (ci->rta_clntref)
505 fprintf(fp, " users %d", ci->rta_clntref);
506 if (ci->rta_used != 0)
507 fprintf(fp, " used %d", ci->rta_used);
508 if (ci->rta_lastuse != 0)
509 fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
510 }
511 } else if (ci) {
512 if (ci->rta_error != 0)
513 fprintf(fp, " error %d", ci->rta_error);
514 }
515 }
516 if (tb[RTA_METRICS]) {
517 int i;
518 unsigned mxlock = 0;
519 struct rtattr *mxrta[RTAX_MAX+1];
520
521 parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(tb[RTA_METRICS]),
522 RTA_PAYLOAD(tb[RTA_METRICS]));
523 if (mxrta[RTAX_LOCK])
524 mxlock = *(unsigned*)RTA_DATA(mxrta[RTAX_LOCK]);
525
526 for (i=2; i<= RTAX_MAX; i++) {
527 unsigned val;
528
529 if (mxrta[i] == NULL)
530 continue;
531
532 if (i < sizeof(mx_names)/sizeof(char*) && mx_names[i])
533 fprintf(fp, " %s", mx_names[i]);
534 else
535 fprintf(fp, " metric %d", i);
536 if (mxlock & (1<<i))
537 fprintf(fp, " lock");
538
539 val = *(unsigned*)RTA_DATA(mxrta[i]);
540 switch (i) {
541 case RTAX_HOPLIMIT:
542 if ((int)val == -1)
543 val = 0;
544 /* fall through */
545 default:
546 fprintf(fp, " %u", val);
547 break;
548
549 case RTAX_RTT:
550 case RTAX_RTTVAR:
551 case RTAX_RTO_MIN:
552 if (i == RTAX_RTT)
553 val /= 8;
554 else if (i == RTAX_RTTVAR)
555 val /= 4;
556
557 if (val >= 1000)
558 fprintf(fp, " %gs", val/1e3);
559 else
560 fprintf(fp, " %ums", val);
561 }
562 }
563 }
564 if (tb[RTA_IIF] && filter.iifmask != -1) {
565 fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
566 }
567 if (tb[RTA_MULTIPATH]) {
568 struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
569 int first = 0;
570
571 len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
572
573 for (;;) {
574 if (len < sizeof(*nh))
575 break;
576 if (nh->rtnh_len > len)
577 break;
578 if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
579 if (first)
580 fprintf(fp, " Oifs:");
581 else
582 fprintf(fp, " ");
583 } else
584 fprintf(fp, "%s\tnexthop", _SL_);
585 if (nh->rtnh_len > sizeof(*nh)) {
586 parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh), nh->rtnh_len - sizeof(*nh));
587 if (tb[RTA_GATEWAY]) {
588 fprintf(fp, " via %s ",
589 format_host(r->rtm_family,
590 RTA_PAYLOAD(tb[RTA_GATEWAY]),
591 RTA_DATA(tb[RTA_GATEWAY]),
592 abuf, sizeof(abuf)));
593 }
594 if (tb[RTA_FLOW]) {
595 __u32 to = rta_getattr_u32(tb[RTA_FLOW]);
596 __u32 from = to>>16;
597 to &= 0xFFFF;
598 fprintf(fp, " realm%s ", from ? "s" : "");
599 if (from) {
600 fprintf(fp, "%s/",
601 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
602 }
603 fprintf(fp, "%s",
604 rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
605 }
606 }
607 if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
608 fprintf(fp, " %s", ll_index_to_name(nh->rtnh_ifindex));
609 if (nh->rtnh_hops != 1)
610 fprintf(fp, "(ttl>%d)", nh->rtnh_hops);
611 } else {
612 fprintf(fp, " dev %s", ll_index_to_name(nh->rtnh_ifindex));
613 fprintf(fp, " weight %d", nh->rtnh_hops+1);
614 }
615 if (nh->rtnh_flags & RTNH_F_DEAD)
616 fprintf(fp, " dead");
617 if (nh->rtnh_flags & RTNH_F_ONLINK)
618 fprintf(fp, " onlink");
619 if (nh->rtnh_flags & RTNH_F_PERVASIVE)
620 fprintf(fp, " pervasive");
621 len -= NLMSG_ALIGN(nh->rtnh_len);
622 nh = RTNH_NEXT(nh);
623 }
624 }
625 fprintf(fp, "\n");
626 fflush(fp);
627 return 0;
628 }
629
630
parse_one_nh(struct rtattr * rta,struct rtnexthop * rtnh,int * argcp,char *** argvp)631 int parse_one_nh(struct rtattr *rta, struct rtnexthop *rtnh, int *argcp, char ***argvp)
632 {
633 int argc = *argcp;
634 char **argv = *argvp;
635
636 while (++argv, --argc > 0) {
637 if (strcmp(*argv, "via") == 0) {
638 NEXT_ARG();
639 rta_addattr32(rta, 4096, RTA_GATEWAY, get_addr32(*argv));
640 rtnh->rtnh_len += sizeof(struct rtattr) + 4;
641 } else if (strcmp(*argv, "dev") == 0) {
642 NEXT_ARG();
643 if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
644 fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
645 exit(1);
646 }
647 } else if (strcmp(*argv, "weight") == 0) {
648 unsigned w;
649 NEXT_ARG();
650 if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
651 invarg("\"weight\" is invalid\n", *argv);
652 rtnh->rtnh_hops = w - 1;
653 } else if (strcmp(*argv, "onlink") == 0) {
654 rtnh->rtnh_flags |= RTNH_F_ONLINK;
655 } else if (matches(*argv, "realms") == 0) {
656 __u32 realm;
657 NEXT_ARG();
658 if (get_rt_realms(&realm, *argv))
659 invarg("\"realm\" value is invalid\n", *argv);
660 rta_addattr32(rta, 4096, RTA_FLOW, realm);
661 rtnh->rtnh_len += sizeof(struct rtattr) + 4;
662 } else
663 break;
664 }
665 *argcp = argc;
666 *argvp = argv;
667 return 0;
668 }
669
parse_nexthops(struct nlmsghdr * n,struct rtmsg * r,int argc,char ** argv)670 int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r, int argc, char **argv)
671 {
672 char buf[1024];
673 struct rtattr *rta = (void*)buf;
674 struct rtnexthop *rtnh;
675
676 rta->rta_type = RTA_MULTIPATH;
677 rta->rta_len = RTA_LENGTH(0);
678 rtnh = RTA_DATA(rta);
679
680 while (argc > 0) {
681 if (strcmp(*argv, "nexthop") != 0) {
682 fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
683 exit(-1);
684 }
685 if (argc <= 1) {
686 fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
687 exit(-1);
688 }
689 memset(rtnh, 0, sizeof(*rtnh));
690 rtnh->rtnh_len = sizeof(*rtnh);
691 rta->rta_len += rtnh->rtnh_len;
692 parse_one_nh(rta, rtnh, &argc, &argv);
693 rtnh = RTNH_NEXT(rtnh);
694 }
695
696 if (rta->rta_len > RTA_LENGTH(0))
697 addattr_l(n, 1024, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta));
698 return 0;
699 }
700
701
iproute_modify(int cmd,unsigned flags,int argc,char ** argv)702 int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
703 {
704 struct {
705 struct nlmsghdr n;
706 struct rtmsg r;
707 char buf[1024];
708 } req;
709 char mxbuf[256];
710 struct rtattr * mxrta = (void*)mxbuf;
711 unsigned mxlock = 0;
712 char *d = NULL;
713 int gw_ok = 0;
714 int dst_ok = 0;
715 int nhs_ok = 0;
716 int scope_ok = 0;
717 int table_ok = 0;
718 int raw = 0;
719
720 memset(&req, 0, sizeof(req));
721
722 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
723 req.n.nlmsg_flags = NLM_F_REQUEST|flags;
724 req.n.nlmsg_type = cmd;
725 req.r.rtm_family = preferred_family;
726 req.r.rtm_table = RT_TABLE_MAIN;
727 req.r.rtm_scope = RT_SCOPE_NOWHERE;
728
729 if (cmd != RTM_DELROUTE) {
730 req.r.rtm_protocol = RTPROT_BOOT;
731 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
732 req.r.rtm_type = RTN_UNICAST;
733 }
734
735 mxrta->rta_type = RTA_METRICS;
736 mxrta->rta_len = RTA_LENGTH(0);
737
738 while (argc > 0) {
739 if (strcmp(*argv, "src") == 0) {
740 inet_prefix addr;
741 NEXT_ARG();
742 get_addr(&addr, *argv, req.r.rtm_family);
743 if (req.r.rtm_family == AF_UNSPEC)
744 req.r.rtm_family = addr.family;
745 addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
746 } else if (strcmp(*argv, "via") == 0) {
747 inet_prefix addr;
748 gw_ok = 1;
749 NEXT_ARG();
750 get_addr(&addr, *argv, req.r.rtm_family);
751 if (req.r.rtm_family == AF_UNSPEC)
752 req.r.rtm_family = addr.family;
753 addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
754 } else if (strcmp(*argv, "from") == 0) {
755 inet_prefix addr;
756 NEXT_ARG();
757 get_prefix(&addr, *argv, req.r.rtm_family);
758 if (req.r.rtm_family == AF_UNSPEC)
759 req.r.rtm_family = addr.family;
760 if (addr.bytelen)
761 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
762 req.r.rtm_src_len = addr.bitlen;
763 } else if (strcmp(*argv, "tos") == 0 ||
764 matches(*argv, "dsfield") == 0) {
765 __u32 tos;
766 NEXT_ARG();
767 if (rtnl_dsfield_a2n(&tos, *argv))
768 invarg("\"tos\" value is invalid\n", *argv);
769 req.r.rtm_tos = tos;
770 } else if (matches(*argv, "metric") == 0 ||
771 matches(*argv, "priority") == 0 ||
772 matches(*argv, "preference") == 0) {
773 __u32 metric;
774 NEXT_ARG();
775 if (get_u32(&metric, *argv, 0))
776 invarg("\"metric\" value is invalid\n", *argv);
777 addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
778 } else if (strcmp(*argv, "scope") == 0) {
779 __u32 scope = 0;
780 NEXT_ARG();
781 if (rtnl_rtscope_a2n(&scope, *argv))
782 invarg("invalid \"scope\" value\n", *argv);
783 req.r.rtm_scope = scope;
784 scope_ok = 1;
785 } else if (strcmp(*argv, "mtu") == 0) {
786 unsigned mtu;
787 NEXT_ARG();
788 if (strcmp(*argv, "lock") == 0) {
789 mxlock |= (1<<RTAX_MTU);
790 NEXT_ARG();
791 }
792 if (get_unsigned(&mtu, *argv, 0))
793 invarg("\"mtu\" value is invalid\n", *argv);
794 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
795 } else if (strcmp(*argv, "hoplimit") == 0) {
796 unsigned hoplimit;
797 NEXT_ARG();
798 if (strcmp(*argv, "lock") == 0) {
799 mxlock |= (1<<RTAX_HOPLIMIT);
800 NEXT_ARG();
801 }
802 if (get_unsigned(&hoplimit, *argv, 0))
803 invarg("\"hoplimit\" value is invalid\n", *argv);
804 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
805 } else if (strcmp(*argv, "advmss") == 0) {
806 unsigned mss;
807 NEXT_ARG();
808 if (strcmp(*argv, "lock") == 0) {
809 mxlock |= (1<<RTAX_ADVMSS);
810 NEXT_ARG();
811 }
812 if (get_unsigned(&mss, *argv, 0))
813 invarg("\"mss\" value is invalid\n", *argv);
814 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
815 } else if (matches(*argv, "reordering") == 0) {
816 unsigned reord;
817 NEXT_ARG();
818 if (strcmp(*argv, "lock") == 0) {
819 mxlock |= (1<<RTAX_REORDERING);
820 NEXT_ARG();
821 }
822 if (get_unsigned(&reord, *argv, 0))
823 invarg("\"reordering\" value is invalid\n", *argv);
824 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
825 } else if (strcmp(*argv, "rtt") == 0) {
826 unsigned rtt;
827 NEXT_ARG();
828 if (strcmp(*argv, "lock") == 0) {
829 mxlock |= (1<<RTAX_RTT);
830 NEXT_ARG();
831 }
832 if (get_time_rtt(&rtt, *argv, &raw))
833 invarg("\"rtt\" value is invalid\n", *argv);
834 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
835 (raw) ? rtt : rtt * 8);
836 } else if (strcmp(*argv, "rto_min") == 0) {
837 unsigned rto_min;
838 NEXT_ARG();
839 mxlock |= (1<<RTAX_RTO_MIN);
840 if (get_time_rtt(&rto_min, *argv, &raw))
841 invarg("\"rto_min\" value is invalid\n",
842 *argv);
843 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
844 rto_min);
845 } else if (matches(*argv, "window") == 0) {
846 unsigned win;
847 NEXT_ARG();
848 if (strcmp(*argv, "lock") == 0) {
849 mxlock |= (1<<RTAX_WINDOW);
850 NEXT_ARG();
851 }
852 if (get_unsigned(&win, *argv, 0))
853 invarg("\"window\" value is invalid\n", *argv);
854 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
855 } else if (matches(*argv, "cwnd") == 0) {
856 unsigned win;
857 NEXT_ARG();
858 if (strcmp(*argv, "lock") == 0) {
859 mxlock |= (1<<RTAX_CWND);
860 NEXT_ARG();
861 }
862 if (get_unsigned(&win, *argv, 0))
863 invarg("\"cwnd\" value is invalid\n", *argv);
864 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
865 } else if (matches(*argv, "initcwnd") == 0) {
866 unsigned win;
867 NEXT_ARG();
868 if (strcmp(*argv, "lock") == 0) {
869 mxlock |= (1<<RTAX_INITCWND);
870 NEXT_ARG();
871 }
872 if (get_unsigned(&win, *argv, 0))
873 invarg("\"initcwnd\" value is invalid\n", *argv);
874 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
875 } else if (matches(*argv, "initrwnd") == 0) {
876 unsigned win;
877 NEXT_ARG();
878 if (strcmp(*argv, "lock") == 0) {
879 mxlock |= (1<<RTAX_INITRWND);
880 NEXT_ARG();
881 }
882 if (get_unsigned(&win, *argv, 0))
883 invarg("\"initrwnd\" value is invalid\n", *argv);
884 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITRWND, win);
885 } else if (matches(*argv, "rttvar") == 0) {
886 unsigned win;
887 NEXT_ARG();
888 if (strcmp(*argv, "lock") == 0) {
889 mxlock |= (1<<RTAX_RTTVAR);
890 NEXT_ARG();
891 }
892 if (get_time_rtt(&win, *argv, &raw))
893 invarg("\"rttvar\" value is invalid\n", *argv);
894 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
895 (raw) ? win : win * 4);
896 } else if (matches(*argv, "ssthresh") == 0) {
897 unsigned win;
898 NEXT_ARG();
899 if (strcmp(*argv, "lock") == 0) {
900 mxlock |= (1<<RTAX_SSTHRESH);
901 NEXT_ARG();
902 }
903 if (get_unsigned(&win, *argv, 0))
904 invarg("\"ssthresh\" value is invalid\n", *argv);
905 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
906 } else if (matches(*argv, "realms") == 0) {
907 __u32 realm;
908 NEXT_ARG();
909 if (get_rt_realms(&realm, *argv))
910 invarg("\"realm\" value is invalid\n", *argv);
911 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
912 } else if (strcmp(*argv, "onlink") == 0) {
913 req.r.rtm_flags |= RTNH_F_ONLINK;
914 } else if (strcmp(*argv, "nexthop") == 0) {
915 nhs_ok = 1;
916 break;
917 } else if (matches(*argv, "protocol") == 0) {
918 __u32 prot;
919 NEXT_ARG();
920 if (rtnl_rtprot_a2n(&prot, *argv))
921 invarg("\"protocol\" value is invalid\n", *argv);
922 req.r.rtm_protocol = prot;
923 } else if (matches(*argv, "table") == 0) {
924 __u32 tid;
925 NEXT_ARG();
926 if (rtnl_rttable_a2n(&tid, *argv))
927 invarg("\"table\" value is invalid\n", *argv);
928 if (tid < 256)
929 req.r.rtm_table = tid;
930 else {
931 req.r.rtm_table = RT_TABLE_UNSPEC;
932 addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
933 }
934 table_ok = 1;
935 } else if (strcmp(*argv, "dev") == 0 ||
936 strcmp(*argv, "oif") == 0) {
937 NEXT_ARG();
938 d = *argv;
939 } else {
940 int type;
941 inet_prefix dst;
942
943 if (strcmp(*argv, "to") == 0) {
944 NEXT_ARG();
945 }
946 if ((**argv < '0' || **argv > '9') &&
947 rtnl_rtntype_a2n(&type, *argv) == 0) {
948 NEXT_ARG();
949 req.r.rtm_type = type;
950 }
951
952 if (matches(*argv, "help") == 0)
953 usage();
954 if (dst_ok)
955 duparg2("to", *argv);
956 get_prefix(&dst, *argv, req.r.rtm_family);
957 if (req.r.rtm_family == AF_UNSPEC)
958 req.r.rtm_family = dst.family;
959 req.r.rtm_dst_len = dst.bitlen;
960 dst_ok = 1;
961 if (dst.bytelen)
962 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
963 }
964 argc--; argv++;
965 }
966
967 if (d || nhs_ok) {
968 int idx;
969
970 ll_init_map(&rth);
971
972 if (d) {
973 if ((idx = ll_name_to_index(d)) == 0) {
974 fprintf(stderr, "Cannot find device \"%s\"\n", d);
975 return -1;
976 }
977 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
978 }
979 }
980
981 if (mxrta->rta_len > RTA_LENGTH(0)) {
982 if (mxlock)
983 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
984 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
985 }
986
987 if (nhs_ok)
988 parse_nexthops(&req.n, &req.r, argc, argv);
989
990 if (!table_ok) {
991 if (req.r.rtm_type == RTN_LOCAL ||
992 req.r.rtm_type == RTN_BROADCAST ||
993 req.r.rtm_type == RTN_NAT ||
994 req.r.rtm_type == RTN_ANYCAST)
995 req.r.rtm_table = RT_TABLE_LOCAL;
996 }
997 if (!scope_ok) {
998 if (req.r.rtm_type == RTN_LOCAL ||
999 req.r.rtm_type == RTN_NAT)
1000 req.r.rtm_scope = RT_SCOPE_HOST;
1001 else if (req.r.rtm_type == RTN_BROADCAST ||
1002 req.r.rtm_type == RTN_MULTICAST ||
1003 req.r.rtm_type == RTN_ANYCAST)
1004 req.r.rtm_scope = RT_SCOPE_LINK;
1005 else if (req.r.rtm_type == RTN_UNICAST ||
1006 req.r.rtm_type == RTN_UNSPEC) {
1007 if (cmd == RTM_DELROUTE)
1008 req.r.rtm_scope = RT_SCOPE_NOWHERE;
1009 else if (!gw_ok && !nhs_ok)
1010 req.r.rtm_scope = RT_SCOPE_LINK;
1011 }
1012 }
1013
1014 if (req.r.rtm_family == AF_UNSPEC)
1015 req.r.rtm_family = AF_INET;
1016
1017 if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
1018 exit(2);
1019
1020 return 0;
1021 }
1022
rtnl_rtcache_request(struct rtnl_handle * rth,int family)1023 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
1024 {
1025 struct {
1026 struct nlmsghdr nlh;
1027 struct rtmsg rtm;
1028 } req;
1029 struct sockaddr_nl nladdr;
1030
1031 memset(&nladdr, 0, sizeof(nladdr));
1032 memset(&req, 0, sizeof(req));
1033 nladdr.nl_family = AF_NETLINK;
1034
1035 req.nlh.nlmsg_len = sizeof(req);
1036 req.nlh.nlmsg_type = RTM_GETROUTE;
1037 req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
1038 req.nlh.nlmsg_pid = 0;
1039 req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
1040 req.rtm.rtm_family = family;
1041 req.rtm.rtm_flags |= RTM_F_CLONED;
1042
1043 return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
1044 }
1045
iproute_flush_cache(void)1046 static int iproute_flush_cache(void)
1047 {
1048 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
1049
1050 int len;
1051 int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
1052 char *buffer = "-1";
1053
1054 if (flush_fd < 0) {
1055 fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
1056 return -1;
1057 }
1058
1059 len = strlen (buffer);
1060
1061 if ((write (flush_fd, (void *)buffer, len)) < len) {
1062 fprintf (stderr, "Cannot flush routing cache\n");
1063 close(flush_fd);
1064 return -1;
1065 }
1066 close(flush_fd);
1067 return 0;
1068 }
1069
save_route(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)1070 int save_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
1071 {
1072 int ret;
1073 int len = n->nlmsg_len;
1074 struct rtmsg *r = NLMSG_DATA(n);
1075 struct rtattr *tb[RTA_MAX+1];
1076 int host_len = -1;
1077
1078 if (isatty(STDOUT_FILENO)) {
1079 fprintf(stderr, "Not sending binary stream to stdout\n");
1080 return -1;
1081 }
1082
1083 host_len = calc_host_len(r);
1084 len -= NLMSG_LENGTH(sizeof(*r));
1085 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1086
1087 if (!filter_nlmsg(n, tb, host_len))
1088 return 0;
1089
1090 ret = write(STDOUT_FILENO, n, n->nlmsg_len);
1091 if ((ret > 0) && (ret != n->nlmsg_len)) {
1092 fprintf(stderr, "Short write while saving nlmsg\n");
1093 ret = -EIO;
1094 }
1095
1096 return ret == n->nlmsg_len ? 0 : ret;
1097 }
1098
iproute_list_flush_or_save(int argc,char ** argv,int action)1099 static int iproute_list_flush_or_save(int argc, char **argv, int action)
1100 {
1101 int do_ipv6 = preferred_family;
1102 char *id = NULL;
1103 char *od = NULL;
1104 unsigned int mark = 0;
1105 rtnl_filter_t filter_fn;
1106
1107 if (action == IPROUTE_SAVE)
1108 filter_fn = save_route;
1109 else
1110 filter_fn = print_route;
1111
1112 iproute_reset_filter();
1113 filter.tb = RT_TABLE_MAIN;
1114
1115 if ((action == IPROUTE_FLUSH) && argc <= 0) {
1116 fprintf(stderr, "\"ip route flush\" requires arguments.\n");
1117 return -1;
1118 }
1119
1120 while (argc > 0) {
1121 if (matches(*argv, "table") == 0) {
1122 __u32 tid;
1123 NEXT_ARG();
1124 if (rtnl_rttable_a2n(&tid, *argv)) {
1125 if (strcmp(*argv, "all") == 0) {
1126 filter.tb = 0;
1127 } else if (strcmp(*argv, "cache") == 0) {
1128 filter.cloned = 1;
1129 } else if (strcmp(*argv, "help") == 0) {
1130 usage();
1131 } else {
1132 invarg("table id value is invalid\n", *argv);
1133 }
1134 } else
1135 filter.tb = tid;
1136 } else if (matches(*argv, "cached") == 0 ||
1137 matches(*argv, "cloned") == 0) {
1138 filter.cloned = 1;
1139 } else if (strcmp(*argv, "tos") == 0 ||
1140 matches(*argv, "dsfield") == 0) {
1141 __u32 tos;
1142 NEXT_ARG();
1143 if (rtnl_dsfield_a2n(&tos, *argv))
1144 invarg("TOS value is invalid\n", *argv);
1145 filter.tos = tos;
1146 filter.tosmask = -1;
1147 } else if (matches(*argv, "protocol") == 0) {
1148 __u32 prot = 0;
1149 NEXT_ARG();
1150 filter.protocolmask = -1;
1151 if (rtnl_rtprot_a2n(&prot, *argv)) {
1152 if (strcmp(*argv, "all") != 0)
1153 invarg("invalid \"protocol\"\n", *argv);
1154 prot = 0;
1155 filter.protocolmask = 0;
1156 }
1157 filter.protocol = prot;
1158 } else if (matches(*argv, "scope") == 0) {
1159 __u32 scope = 0;
1160 NEXT_ARG();
1161 filter.scopemask = -1;
1162 if (rtnl_rtscope_a2n(&scope, *argv)) {
1163 if (strcmp(*argv, "all") != 0)
1164 invarg("invalid \"scope\"\n", *argv);
1165 scope = RT_SCOPE_NOWHERE;
1166 filter.scopemask = 0;
1167 }
1168 filter.scope = scope;
1169 } else if (matches(*argv, "type") == 0) {
1170 int type;
1171 NEXT_ARG();
1172 filter.typemask = -1;
1173 if (rtnl_rtntype_a2n(&type, *argv))
1174 invarg("node type value is invalid\n", *argv);
1175 filter.type = type;
1176 } else if (strcmp(*argv, "dev") == 0 ||
1177 strcmp(*argv, "oif") == 0) {
1178 NEXT_ARG();
1179 od = *argv;
1180 } else if (strcmp(*argv, "iif") == 0) {
1181 NEXT_ARG();
1182 id = *argv;
1183 } else if (strcmp(*argv, "mark") == 0) {
1184 NEXT_ARG();
1185 get_unsigned(&mark, *argv, 0);
1186 filter.markmask = -1;
1187 } else if (strcmp(*argv, "via") == 0) {
1188 NEXT_ARG();
1189 get_prefix(&filter.rvia, *argv, do_ipv6);
1190 } else if (strcmp(*argv, "src") == 0) {
1191 NEXT_ARG();
1192 get_prefix(&filter.rprefsrc, *argv, do_ipv6);
1193 } else if (matches(*argv, "realms") == 0) {
1194 __u32 realm;
1195 NEXT_ARG();
1196 if (get_rt_realms(&realm, *argv))
1197 invarg("invalid realms\n", *argv);
1198 filter.realm = realm;
1199 filter.realmmask = ~0U;
1200 if ((filter.realm&0xFFFF) == 0 &&
1201 (*argv)[strlen(*argv) - 1] == '/')
1202 filter.realmmask &= ~0xFFFF;
1203 if ((filter.realm&0xFFFF0000U) == 0 &&
1204 (strchr(*argv, '/') == NULL ||
1205 (*argv)[0] == '/'))
1206 filter.realmmask &= ~0xFFFF0000U;
1207 } else if (matches(*argv, "from") == 0) {
1208 NEXT_ARG();
1209 if (matches(*argv, "root") == 0) {
1210 NEXT_ARG();
1211 get_prefix(&filter.rsrc, *argv, do_ipv6);
1212 } else if (matches(*argv, "match") == 0) {
1213 NEXT_ARG();
1214 get_prefix(&filter.msrc, *argv, do_ipv6);
1215 } else {
1216 if (matches(*argv, "exact") == 0) {
1217 NEXT_ARG();
1218 }
1219 get_prefix(&filter.msrc, *argv, do_ipv6);
1220 filter.rsrc = filter.msrc;
1221 }
1222 } else {
1223 if (matches(*argv, "to") == 0) {
1224 NEXT_ARG();
1225 }
1226 if (matches(*argv, "root") == 0) {
1227 NEXT_ARG();
1228 get_prefix(&filter.rdst, *argv, do_ipv6);
1229 } else if (matches(*argv, "match") == 0) {
1230 NEXT_ARG();
1231 get_prefix(&filter.mdst, *argv, do_ipv6);
1232 } else {
1233 if (matches(*argv, "exact") == 0) {
1234 NEXT_ARG();
1235 }
1236 get_prefix(&filter.mdst, *argv, do_ipv6);
1237 filter.rdst = filter.mdst;
1238 }
1239 }
1240 argc--; argv++;
1241 }
1242
1243 if (do_ipv6 == AF_UNSPEC && filter.tb)
1244 do_ipv6 = AF_INET;
1245
1246 ll_init_map(&rth);
1247
1248 if (id || od) {
1249 int idx;
1250
1251 if (id) {
1252 if ((idx = ll_name_to_index(id)) == 0) {
1253 fprintf(stderr, "Cannot find device \"%s\"\n", id);
1254 return -1;
1255 }
1256 filter.iif = idx;
1257 filter.iifmask = -1;
1258 }
1259 if (od) {
1260 if ((idx = ll_name_to_index(od)) == 0) {
1261 fprintf(stderr, "Cannot find device \"%s\"\n", od);
1262 return -1;
1263 }
1264 filter.oif = idx;
1265 filter.oifmask = -1;
1266 }
1267 }
1268 filter.mark = mark;
1269
1270 if (action == IPROUTE_FLUSH) {
1271 int round = 0;
1272 char flushb[4096-512];
1273 time_t start = time(0);
1274
1275 if (filter.cloned) {
1276 if (do_ipv6 != AF_INET6) {
1277 iproute_flush_cache();
1278 if (show_stats)
1279 printf("*** IPv4 routing cache is flushed.\n");
1280 }
1281 if (do_ipv6 == AF_INET)
1282 return 0;
1283 }
1284
1285 filter.flushb = flushb;
1286 filter.flushp = 0;
1287 filter.flushe = sizeof(flushb);
1288
1289 for (;;) {
1290 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1291 perror("Cannot send dump request");
1292 exit(1);
1293 }
1294 filter.flushed = 0;
1295 if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1296 fprintf(stderr, "Flush terminated\n");
1297 exit(1);
1298 }
1299 if (filter.flushed == 0) {
1300 if (show_stats) {
1301 if (round == 0 && (!filter.cloned || do_ipv6 == AF_INET6))
1302 printf("Nothing to flush.\n");
1303 else
1304 printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":"");
1305 }
1306 fflush(stdout);
1307 return 0;
1308 }
1309 round++;
1310 if (flush_update() < 0)
1311 exit(1);
1312
1313 if (time(0) - start > 30) {
1314 printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
1315 time(0) - start, filter.flushed);
1316 exit(1);
1317 }
1318
1319 if (show_stats) {
1320 printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
1321 fflush(stdout);
1322 }
1323 }
1324 }
1325
1326 if (!filter.cloned) {
1327 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1328 perror("Cannot send dump request");
1329 exit(1);
1330 }
1331 } else {
1332 if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
1333 perror("Cannot send dump request");
1334 exit(1);
1335 }
1336 }
1337
1338 if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1339 fprintf(stderr, "Dump terminated\n");
1340 exit(1);
1341 }
1342
1343 exit(0);
1344 }
1345
1346
iproute_get(int argc,char ** argv)1347 int iproute_get(int argc, char **argv)
1348 {
1349 struct {
1350 struct nlmsghdr n;
1351 struct rtmsg r;
1352 char buf[1024];
1353 } req;
1354 char *idev = NULL;
1355 char *odev = NULL;
1356 int connected = 0;
1357 int from_ok = 0;
1358 unsigned int mark = 0;
1359
1360 memset(&req, 0, sizeof(req));
1361
1362 iproute_reset_filter();
1363 filter.cloned = 2;
1364
1365 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
1366 req.n.nlmsg_flags = NLM_F_REQUEST;
1367 req.n.nlmsg_type = RTM_GETROUTE;
1368 req.r.rtm_family = preferred_family;
1369 req.r.rtm_table = 0;
1370 req.r.rtm_protocol = 0;
1371 req.r.rtm_scope = 0;
1372 req.r.rtm_type = 0;
1373 req.r.rtm_src_len = 0;
1374 req.r.rtm_dst_len = 0;
1375 req.r.rtm_tos = 0;
1376
1377 while (argc > 0) {
1378 if (strcmp(*argv, "tos") == 0 ||
1379 matches(*argv, "dsfield") == 0) {
1380 __u32 tos;
1381 NEXT_ARG();
1382 if (rtnl_dsfield_a2n(&tos, *argv))
1383 invarg("TOS value is invalid\n", *argv);
1384 req.r.rtm_tos = tos;
1385 } else if (matches(*argv, "from") == 0) {
1386 inet_prefix addr;
1387 NEXT_ARG();
1388 if (matches(*argv, "help") == 0)
1389 usage();
1390 from_ok = 1;
1391 get_prefix(&addr, *argv, req.r.rtm_family);
1392 if (req.r.rtm_family == AF_UNSPEC)
1393 req.r.rtm_family = addr.family;
1394 if (addr.bytelen)
1395 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
1396 req.r.rtm_src_len = addr.bitlen;
1397 } else if (matches(*argv, "iif") == 0) {
1398 NEXT_ARG();
1399 idev = *argv;
1400 } else if (matches(*argv, "mark") == 0) {
1401 NEXT_ARG();
1402 get_unsigned(&mark, *argv, 0);
1403 } else if (matches(*argv, "oif") == 0 ||
1404 strcmp(*argv, "dev") == 0) {
1405 NEXT_ARG();
1406 odev = *argv;
1407 } else if (matches(*argv, "uid") == 0) {
1408 uid_t uid;
1409 NEXT_ARG();
1410 get_unsigned(&uid, *argv, 0);
1411 addattr32(&req.n, sizeof(req), RTA_UID, uid);
1412 } else if (matches(*argv, "notify") == 0) {
1413 req.r.rtm_flags |= RTM_F_NOTIFY;
1414 } else if (matches(*argv, "connected") == 0) {
1415 connected = 1;
1416 } else {
1417 inet_prefix addr;
1418 if (strcmp(*argv, "to") == 0) {
1419 NEXT_ARG();
1420 }
1421 if (matches(*argv, "help") == 0)
1422 usage();
1423 get_prefix(&addr, *argv, req.r.rtm_family);
1424 if (req.r.rtm_family == AF_UNSPEC)
1425 req.r.rtm_family = addr.family;
1426 if (addr.bytelen)
1427 addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
1428 req.r.rtm_dst_len = addr.bitlen;
1429 }
1430 argc--; argv++;
1431 }
1432
1433 if (req.r.rtm_dst_len == 0) {
1434 fprintf(stderr, "need at least destination address\n");
1435 exit(1);
1436 }
1437
1438 ll_init_map(&rth);
1439
1440 if (idev || odev) {
1441 int idx;
1442
1443 if (idev) {
1444 if ((idx = ll_name_to_index(idev)) == 0) {
1445 fprintf(stderr, "Cannot find device \"%s\"\n", idev);
1446 return -1;
1447 }
1448 addattr32(&req.n, sizeof(req), RTA_IIF, idx);
1449 }
1450 if (odev) {
1451 if ((idx = ll_name_to_index(odev)) == 0) {
1452 fprintf(stderr, "Cannot find device \"%s\"\n", odev);
1453 return -1;
1454 }
1455 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1456 }
1457 }
1458 if (mark)
1459 addattr32(&req.n, sizeof(req), RTA_MARK, mark);
1460
1461 if (req.r.rtm_family == AF_UNSPEC)
1462 req.r.rtm_family = AF_INET;
1463
1464 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0)
1465 exit(2);
1466
1467 if (connected && !from_ok) {
1468 struct rtmsg *r = NLMSG_DATA(&req.n);
1469 int len = req.n.nlmsg_len;
1470 struct rtattr * tb[RTA_MAX+1];
1471
1472 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1473 fprintf(stderr, "An error :-)\n");
1474 exit(1);
1475 }
1476
1477 if (req.n.nlmsg_type != RTM_NEWROUTE) {
1478 fprintf(stderr, "Not a route?\n");
1479 return -1;
1480 }
1481 len -= NLMSG_LENGTH(sizeof(*r));
1482 if (len < 0) {
1483 fprintf(stderr, "Wrong len %d\n", len);
1484 return -1;
1485 }
1486
1487 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1488
1489 if (tb[RTA_PREFSRC]) {
1490 tb[RTA_PREFSRC]->rta_type = RTA_SRC;
1491 r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
1492 } else if (!tb[RTA_SRC]) {
1493 fprintf(stderr, "Failed to connect the route\n");
1494 return -1;
1495 }
1496 if (!odev && tb[RTA_OIF])
1497 tb[RTA_OIF]->rta_type = 0;
1498 if (tb[RTA_GATEWAY])
1499 tb[RTA_GATEWAY]->rta_type = 0;
1500 if (!idev && tb[RTA_IIF])
1501 tb[RTA_IIF]->rta_type = 0;
1502 req.n.nlmsg_flags = NLM_F_REQUEST;
1503 req.n.nlmsg_type = RTM_GETROUTE;
1504
1505 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0)
1506 exit(2);
1507 }
1508
1509 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1510 fprintf(stderr, "An error :-)\n");
1511 exit(1);
1512 }
1513
1514 exit(0);
1515 }
1516
restore_handler(const struct sockaddr_nl * nl,struct nlmsghdr * n,void * arg)1517 int restore_handler(const struct sockaddr_nl *nl, struct nlmsghdr *n, void *arg)
1518 {
1519 int ret;
1520
1521 n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
1522
1523 ll_init_map(&rth);
1524
1525 ret = rtnl_talk(&rth, n, 0, 0, n);
1526 if ((ret < 0) && (errno == EEXIST))
1527 ret = 0;
1528
1529 return ret;
1530 }
1531
iproute_restore(void)1532 int iproute_restore(void)
1533 {
1534 exit(rtnl_from_file(stdin, &restore_handler, NULL));
1535 }
1536
iproute_reset_filter()1537 void iproute_reset_filter()
1538 {
1539 memset(&filter, 0, sizeof(filter));
1540 filter.mdst.bitlen = -1;
1541 filter.msrc.bitlen = -1;
1542 }
1543
do_iproute(int argc,char ** argv)1544 int do_iproute(int argc, char **argv)
1545 {
1546 if (argc < 1)
1547 return iproute_list_flush_or_save(0, NULL, IPROUTE_LIST);
1548
1549 if (matches(*argv, "add") == 0)
1550 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
1551 argc-1, argv+1);
1552 if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
1553 return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
1554 argc-1, argv+1);
1555 if (matches(*argv, "replace") == 0)
1556 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
1557 argc-1, argv+1);
1558 if (matches(*argv, "prepend") == 0)
1559 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
1560 argc-1, argv+1);
1561 if (matches(*argv, "append") == 0)
1562 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
1563 argc-1, argv+1);
1564 if (matches(*argv, "test") == 0)
1565 return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
1566 argc-1, argv+1);
1567 if (matches(*argv, "delete") == 0)
1568 return iproute_modify(RTM_DELROUTE, 0,
1569 argc-1, argv+1);
1570 if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
1571 || matches(*argv, "lst") == 0)
1572 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_LIST);
1573 if (matches(*argv, "get") == 0)
1574 return iproute_get(argc-1, argv+1);
1575 if (matches(*argv, "flush") == 0)
1576 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_FLUSH);
1577 if (matches(*argv, "save") == 0)
1578 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_SAVE);
1579 if (matches(*argv, "restore") == 0)
1580 return iproute_restore();
1581 if (matches(*argv, "help") == 0)
1582 usage();
1583 fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
1584 exit(-1);
1585 }
1586
1587