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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 [RTAX_QUICKACK] = "quickack",
56 };
57 static void usage(void) __attribute__((noreturn));
58
59 static void usage(void)
60 {
61 fprintf(stderr, "Usage: ip route { list | flush } SELECTOR\n");
62 fprintf(stderr, " ip route save SELECTOR\n");
63 fprintf(stderr, " ip route restore\n");
64 fprintf(stderr, " ip route showdump\n");
65 fprintf(stderr, " ip route get ADDRESS [ from ADDRESS iif STRING ]\n");
66 fprintf(stderr, " [ oif STRING ] [ tos TOS ]\n");
67 fprintf(stderr, " [ mark NUMBER ]\n");
68 fprintf(stderr, " ip route { add | del | change | append | replace } ROUTE\n");
69 fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
70 fprintf(stderr, " [ table TABLE_ID ] [ proto RTPROTO ]\n");
71 fprintf(stderr, " [ type TYPE ] [ scope SCOPE ]\n");
72 fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
73 fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
74 fprintf(stderr, " [ table TABLE_ID ] [ proto RTPROTO ]\n");
75 fprintf(stderr, " [ scope SCOPE ] [ metric METRIC ]\n");
76 fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
77 fprintf(stderr, "NH := [ via ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
78 fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ]\n");
79 fprintf(stderr, " [ rtt TIME ] [ rttvar TIME ] [ reordering NUMBER ]\n");
80 fprintf(stderr, " [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
81 fprintf(stderr, " [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
82 fprintf(stderr, " [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n");
83 fprintf(stderr, " [ quickack BOOL ]\n");
84 fprintf(stderr, "TYPE := [ unicast | local | broadcast | multicast | throw |\n");
85 fprintf(stderr, " unreachable | prohibit | blackhole | nat ]\n");
86 fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
87 fprintf(stderr, "SCOPE := [ host | link | global | NUMBER ]\n");
88 fprintf(stderr, "NHFLAGS := [ onlink | pervasive ]\n");
89 fprintf(stderr, "RTPROTO := [ kernel | boot | static | NUMBER ]\n");
90 fprintf(stderr, "TIME := NUMBER[s|ms]\n");
91 fprintf(stderr, "BOOL := [1|0]\n");
92 exit(-1);
93 }
94
95
96 static struct
97 {
98 unsigned int tb;
99 int cloned;
100 int flushed;
101 char *flushb;
102 int flushp;
103 int flushe;
104 int protocol, protocolmask;
105 int scope, scopemask;
106 int type, typemask;
107 int tos, tosmask;
108 int iif, iifmask;
109 int oif, oifmask;
110 int mark, markmask;
111 int realm, realmmask;
112 inet_prefix rprefsrc;
113 inet_prefix rvia;
114 inet_prefix rdst;
115 inet_prefix mdst;
116 inet_prefix rsrc;
117 inet_prefix msrc;
118 } filter;
119
120 static int flush_update(void)
121 {
122 if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
123 perror("Failed to send flush request");
124 return -1;
125 }
126 filter.flushp = 0;
127 return 0;
128 }
129
130 static int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
131 {
132 struct rtmsg *r = NLMSG_DATA(n);
133 inet_prefix dst;
134 inet_prefix src;
135 inet_prefix via;
136 inet_prefix prefsrc;
137 __u32 table;
138 static int ip6_multiple_tables;
139
140 table = rtm_get_table(r, tb);
141
142 if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
143 ip6_multiple_tables = 1;
144
145 if (filter.cloned == !(r->rtm_flags&RTM_F_CLONED))
146 return 0;
147
148 if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
149 if (filter.tb) {
150 if (filter.tb == RT_TABLE_LOCAL) {
151 if (r->rtm_type != RTN_LOCAL)
152 return 0;
153 } else if (filter.tb == RT_TABLE_MAIN) {
154 if (r->rtm_type == RTN_LOCAL)
155 return 0;
156 } else {
157 return 0;
158 }
159 }
160 } else {
161 if (filter.tb > 0 && filter.tb != table)
162 return 0;
163 }
164 if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
165 return 0;
166 if ((filter.scope^r->rtm_scope)&filter.scopemask)
167 return 0;
168 if ((filter.type^r->rtm_type)&filter.typemask)
169 return 0;
170 if ((filter.tos^r->rtm_tos)&filter.tosmask)
171 return 0;
172 if (filter.rdst.family &&
173 (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len))
174 return 0;
175 if (filter.mdst.family &&
176 (r->rtm_family != filter.mdst.family ||
177 (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len)))
178 return 0;
179 if (filter.rsrc.family &&
180 (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len))
181 return 0;
182 if (filter.msrc.family &&
183 (r->rtm_family != filter.msrc.family ||
184 (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len)))
185 return 0;
186 if (filter.rvia.family && r->rtm_family != filter.rvia.family)
187 return 0;
188 if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
189 return 0;
190
191 memset(&dst, 0, sizeof(dst));
192 dst.family = r->rtm_family;
193 if (tb[RTA_DST])
194 memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
195 if (filter.rsrc.family || filter.msrc.family) {
196 memset(&src, 0, sizeof(src));
197 src.family = r->rtm_family;
198 if (tb[RTA_SRC])
199 memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
200 }
201 if (filter.rvia.bitlen>0) {
202 memset(&via, 0, sizeof(via));
203 via.family = r->rtm_family;
204 if (tb[RTA_GATEWAY])
205 memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
206 }
207 if (filter.rprefsrc.bitlen>0) {
208 memset(&prefsrc, 0, sizeof(prefsrc));
209 prefsrc.family = r->rtm_family;
210 if (tb[RTA_PREFSRC])
211 memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
212 }
213
214 if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
215 return 0;
216 if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
217 inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
218 return 0;
219
220 if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
221 return 0;
222 if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
223 inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
224 return 0;
225
226 if (filter.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
227 return 0;
228 if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
229 return 0;
230 if (filter.realmmask) {
231 __u32 realms = 0;
232 if (tb[RTA_FLOW])
233 realms = rta_getattr_u32(tb[RTA_FLOW]);
234 if ((realms^filter.realm)&filter.realmmask)
235 return 0;
236 }
237 if (filter.iifmask) {
238 int iif = 0;
239 if (tb[RTA_IIF])
240 iif = *(int*)RTA_DATA(tb[RTA_IIF]);
241 if ((iif^filter.iif)&filter.iifmask)
242 return 0;
243 }
244 if (filter.oifmask) {
245 int oif = 0;
246 if (tb[RTA_OIF])
247 oif = *(int*)RTA_DATA(tb[RTA_OIF]);
248 if ((oif^filter.oif)&filter.oifmask)
249 return 0;
250 }
251 if (filter.markmask) {
252 int mark = 0;
253 if (tb[RTA_MARK])
254 mark = *(int *)RTA_DATA(tb[RTA_MARK]);
255 if ((mark ^ filter.mark) & filter.markmask)
256 return 0;
257 }
258 if (filter.flushb &&
259 r->rtm_family == AF_INET6 &&
260 r->rtm_dst_len == 0 &&
261 r->rtm_type == RTN_UNREACHABLE &&
262 tb[RTA_PRIORITY] &&
263 *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
264 return 0;
265
266 return 1;
267 }
268
269 static int calc_host_len(const struct rtmsg *r)
270 {
271 if (r->rtm_family == AF_INET6)
272 return 128;
273 else if (r->rtm_family == AF_INET)
274 return 32;
275 else if (r->rtm_family == AF_DECnet)
276 return 16;
277 else if (r->rtm_family == AF_IPX)
278 return 80;
279 else
280 return -1;
281 }
282
283 int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
284 {
285 FILE *fp = (FILE*)arg;
286 struct rtmsg *r = NLMSG_DATA(n);
287 int len = n->nlmsg_len;
288 struct rtattr * tb[RTA_MAX+1];
289 char abuf[256];
290 int host_len = -1;
291 __u32 table;
292 SPRINT_BUF(b1);
293 static int hz;
294
295 if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
296 fprintf(stderr, "Not a route: %08x %08x %08x\n",
297 n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
298 return 0;
299 }
300 if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
301 return 0;
302 len -= NLMSG_LENGTH(sizeof(*r));
303 if (len < 0) {
304 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
305 return -1;
306 }
307
308 host_len = calc_host_len(r);
309
310 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
311 table = rtm_get_table(r, tb);
312
313 if (!filter_nlmsg(n, tb, host_len))
314 return 0;
315
316 if (filter.flushb) {
317 struct nlmsghdr *fn;
318 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
319 if (flush_update())
320 return -1;
321 }
322 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
323 memcpy(fn, n, n->nlmsg_len);
324 fn->nlmsg_type = RTM_DELROUTE;
325 fn->nlmsg_flags = NLM_F_REQUEST;
326 fn->nlmsg_seq = ++rth.seq;
327 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
328 filter.flushed++;
329 if (show_stats < 2)
330 return 0;
331 }
332
333 if (n->nlmsg_type == RTM_DELROUTE)
334 fprintf(fp, "Deleted ");
335 if (r->rtm_type != RTN_UNICAST && !filter.type)
336 fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
337
338 if (tb[RTA_DST]) {
339 if (r->rtm_dst_len != host_len) {
340 fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
341 RTA_PAYLOAD(tb[RTA_DST]),
342 RTA_DATA(tb[RTA_DST]),
343 abuf, sizeof(abuf)),
344 r->rtm_dst_len
345 );
346 } else {
347 fprintf(fp, "%s ", format_host(r->rtm_family,
348 RTA_PAYLOAD(tb[RTA_DST]),
349 RTA_DATA(tb[RTA_DST]),
350 abuf, sizeof(abuf))
351 );
352 }
353 } else if (r->rtm_dst_len) {
354 fprintf(fp, "0/%d ", r->rtm_dst_len);
355 } else {
356 fprintf(fp, "default ");
357 }
358 if (tb[RTA_SRC]) {
359 if (r->rtm_src_len != host_len) {
360 fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
361 RTA_PAYLOAD(tb[RTA_SRC]),
362 RTA_DATA(tb[RTA_SRC]),
363 abuf, sizeof(abuf)),
364 r->rtm_src_len
365 );
366 } else {
367 fprintf(fp, "from %s ", format_host(r->rtm_family,
368 RTA_PAYLOAD(tb[RTA_SRC]),
369 RTA_DATA(tb[RTA_SRC]),
370 abuf, sizeof(abuf))
371 );
372 }
373 } else if (r->rtm_src_len) {
374 fprintf(fp, "from 0/%u ", r->rtm_src_len);
375 }
376 if (r->rtm_tos && filter.tosmask != -1) {
377 SPRINT_BUF(b1);
378 fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
379 }
380
381 if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
382 fprintf(fp, "via %s ",
383 format_host(r->rtm_family,
384 RTA_PAYLOAD(tb[RTA_GATEWAY]),
385 RTA_DATA(tb[RTA_GATEWAY]),
386 abuf, sizeof(abuf)));
387 }
388 if (tb[RTA_OIF] && filter.oifmask != -1)
389 fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
390
391 if (!(r->rtm_flags&RTM_F_CLONED)) {
392 if (table != RT_TABLE_MAIN && !filter.tb)
393 fprintf(fp, " table %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
394 if (r->rtm_protocol != RTPROT_BOOT && filter.protocolmask != -1)
395 fprintf(fp, " proto %s ", rtnl_rtprot_n2a(r->rtm_protocol, b1, sizeof(b1)));
396 if (r->rtm_scope != RT_SCOPE_UNIVERSE && filter.scopemask != -1)
397 fprintf(fp, " scope %s ", rtnl_rtscope_n2a(r->rtm_scope, b1, sizeof(b1)));
398 }
399 if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
400 /* Do not use format_host(). It is our local addr
401 and symbolic name will not be useful.
402 */
403 fprintf(fp, " src %s ",
404 rt_addr_n2a(r->rtm_family,
405 RTA_PAYLOAD(tb[RTA_PREFSRC]),
406 RTA_DATA(tb[RTA_PREFSRC]),
407 abuf, sizeof(abuf)));
408 }
409 if (tb[RTA_PRIORITY])
410 fprintf(fp, " metric %u ", rta_getattr_u32(tb[RTA_PRIORITY]));
411 if (r->rtm_flags & RTNH_F_DEAD)
412 fprintf(fp, "dead ");
413 if (r->rtm_flags & RTNH_F_ONLINK)
414 fprintf(fp, "onlink ");
415 if (r->rtm_flags & RTNH_F_PERVASIVE)
416 fprintf(fp, "pervasive ");
417 if (r->rtm_flags & RTM_F_NOTIFY)
418 fprintf(fp, "notify ");
419 if (tb[RTA_MARK]) {
420 unsigned int mark = *(unsigned int*)RTA_DATA(tb[RTA_MARK]);
421 if (mark) {
422 if (mark >= 16)
423 fprintf(fp, " mark 0x%x", mark);
424 else
425 fprintf(fp, " mark %u", mark);
426 }
427 }
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
631 static int parse_one_nh(struct rtmsg *r, struct rtattr *rta,
632 struct rtnexthop *rtnh,
633 int *argcp, char ***argvp)
634 {
635 int argc = *argcp;
636 char **argv = *argvp;
637
638 while (++argv, --argc > 0) {
639 if (strcmp(*argv, "via") == 0) {
640 inet_prefix addr;
641 NEXT_ARG();
642 get_addr(&addr, *argv, r->rtm_family);
643 if (r->rtm_family == AF_UNSPEC)
644 r->rtm_family = addr.family;
645 rta_addattr_l(rta, 4096, RTA_GATEWAY, &addr.data, addr.bytelen);
646 rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
647 } else if (strcmp(*argv, "dev") == 0) {
648 NEXT_ARG();
649 if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
650 fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
651 exit(1);
652 }
653 } else if (strcmp(*argv, "weight") == 0) {
654 unsigned w;
655 NEXT_ARG();
656 if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
657 invarg("\"weight\" is invalid\n", *argv);
658 rtnh->rtnh_hops = w - 1;
659 } else if (strcmp(*argv, "onlink") == 0) {
660 rtnh->rtnh_flags |= RTNH_F_ONLINK;
661 } else if (matches(*argv, "realms") == 0) {
662 __u32 realm;
663 NEXT_ARG();
664 if (get_rt_realms(&realm, *argv))
665 invarg("\"realm\" value is invalid\n", *argv);
666 rta_addattr32(rta, 4096, RTA_FLOW, realm);
667 rtnh->rtnh_len += sizeof(struct rtattr) + 4;
668 } else
669 break;
670 }
671 *argcp = argc;
672 *argvp = argv;
673 return 0;
674 }
675
676 static int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r,
677 int argc, char **argv)
678 {
679 char buf[1024];
680 struct rtattr *rta = (void*)buf;
681 struct rtnexthop *rtnh;
682
683 rta->rta_type = RTA_MULTIPATH;
684 rta->rta_len = RTA_LENGTH(0);
685 rtnh = RTA_DATA(rta);
686
687 while (argc > 0) {
688 if (strcmp(*argv, "nexthop") != 0) {
689 fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
690 exit(-1);
691 }
692 if (argc <= 1) {
693 fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
694 exit(-1);
695 }
696 memset(rtnh, 0, sizeof(*rtnh));
697 rtnh->rtnh_len = sizeof(*rtnh);
698 rta->rta_len += rtnh->rtnh_len;
699 parse_one_nh(r, rta, rtnh, &argc, &argv);
700 rtnh = RTNH_NEXT(rtnh);
701 }
702
703 if (rta->rta_len > RTA_LENGTH(0))
704 addattr_l(n, 1024, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta));
705 return 0;
706 }
707
708 static int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
709 {
710 struct {
711 struct nlmsghdr n;
712 struct rtmsg r;
713 char buf[1024];
714 } req;
715 char mxbuf[256];
716 struct rtattr * mxrta = (void*)mxbuf;
717 unsigned mxlock = 0;
718 char *d = NULL;
719 int gw_ok = 0;
720 int dst_ok = 0;
721 int nhs_ok = 0;
722 int scope_ok = 0;
723 int table_ok = 0;
724 int raw = 0;
725
726 memset(&req, 0, sizeof(req));
727
728 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
729 req.n.nlmsg_flags = NLM_F_REQUEST|flags;
730 req.n.nlmsg_type = cmd;
731 req.r.rtm_family = preferred_family;
732 req.r.rtm_table = RT_TABLE_MAIN;
733 req.r.rtm_scope = RT_SCOPE_NOWHERE;
734
735 if (cmd != RTM_DELROUTE) {
736 req.r.rtm_protocol = RTPROT_BOOT;
737 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
738 req.r.rtm_type = RTN_UNICAST;
739 }
740
741 mxrta->rta_type = RTA_METRICS;
742 mxrta->rta_len = RTA_LENGTH(0);
743
744 while (argc > 0) {
745 if (strcmp(*argv, "src") == 0) {
746 inet_prefix addr;
747 NEXT_ARG();
748 get_addr(&addr, *argv, req.r.rtm_family);
749 if (req.r.rtm_family == AF_UNSPEC)
750 req.r.rtm_family = addr.family;
751 addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
752 } else if (strcmp(*argv, "via") == 0) {
753 inet_prefix addr;
754 gw_ok = 1;
755 NEXT_ARG();
756 get_addr(&addr, *argv, req.r.rtm_family);
757 if (req.r.rtm_family == AF_UNSPEC)
758 req.r.rtm_family = addr.family;
759 addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
760 } else if (strcmp(*argv, "from") == 0) {
761 inet_prefix addr;
762 NEXT_ARG();
763 get_prefix(&addr, *argv, req.r.rtm_family);
764 if (req.r.rtm_family == AF_UNSPEC)
765 req.r.rtm_family = addr.family;
766 if (addr.bytelen)
767 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
768 req.r.rtm_src_len = addr.bitlen;
769 } else if (strcmp(*argv, "tos") == 0 ||
770 matches(*argv, "dsfield") == 0) {
771 __u32 tos;
772 NEXT_ARG();
773 if (rtnl_dsfield_a2n(&tos, *argv))
774 invarg("\"tos\" value is invalid\n", *argv);
775 req.r.rtm_tos = tos;
776 } else if (matches(*argv, "metric") == 0 ||
777 matches(*argv, "priority") == 0 ||
778 matches(*argv, "preference") == 0) {
779 __u32 metric;
780 NEXT_ARG();
781 if (get_u32(&metric, *argv, 0))
782 invarg("\"metric\" value is invalid\n", *argv);
783 addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
784 } else if (strcmp(*argv, "scope") == 0) {
785 __u32 scope = 0;
786 NEXT_ARG();
787 if (rtnl_rtscope_a2n(&scope, *argv))
788 invarg("invalid \"scope\" value\n", *argv);
789 req.r.rtm_scope = scope;
790 scope_ok = 1;
791 } else if (strcmp(*argv, "mtu") == 0) {
792 unsigned mtu;
793 NEXT_ARG();
794 if (strcmp(*argv, "lock") == 0) {
795 mxlock |= (1<<RTAX_MTU);
796 NEXT_ARG();
797 }
798 if (get_unsigned(&mtu, *argv, 0))
799 invarg("\"mtu\" value is invalid\n", *argv);
800 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
801 } else if (strcmp(*argv, "hoplimit") == 0) {
802 unsigned hoplimit;
803 NEXT_ARG();
804 if (strcmp(*argv, "lock") == 0) {
805 mxlock |= (1<<RTAX_HOPLIMIT);
806 NEXT_ARG();
807 }
808 if (get_unsigned(&hoplimit, *argv, 0))
809 invarg("\"hoplimit\" value is invalid\n", *argv);
810 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
811 } else if (strcmp(*argv, "advmss") == 0) {
812 unsigned mss;
813 NEXT_ARG();
814 if (strcmp(*argv, "lock") == 0) {
815 mxlock |= (1<<RTAX_ADVMSS);
816 NEXT_ARG();
817 }
818 if (get_unsigned(&mss, *argv, 0))
819 invarg("\"mss\" value is invalid\n", *argv);
820 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
821 } else if (matches(*argv, "reordering") == 0) {
822 unsigned reord;
823 NEXT_ARG();
824 if (strcmp(*argv, "lock") == 0) {
825 mxlock |= (1<<RTAX_REORDERING);
826 NEXT_ARG();
827 }
828 if (get_unsigned(&reord, *argv, 0))
829 invarg("\"reordering\" value is invalid\n", *argv);
830 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
831 } else if (strcmp(*argv, "rtt") == 0) {
832 unsigned rtt;
833 NEXT_ARG();
834 if (strcmp(*argv, "lock") == 0) {
835 mxlock |= (1<<RTAX_RTT);
836 NEXT_ARG();
837 }
838 if (get_time_rtt(&rtt, *argv, &raw))
839 invarg("\"rtt\" value is invalid\n", *argv);
840 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
841 (raw) ? rtt : rtt * 8);
842 } else if (strcmp(*argv, "rto_min") == 0) {
843 unsigned rto_min;
844 NEXT_ARG();
845 mxlock |= (1<<RTAX_RTO_MIN);
846 if (get_time_rtt(&rto_min, *argv, &raw))
847 invarg("\"rto_min\" value is invalid\n",
848 *argv);
849 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
850 rto_min);
851 } else if (matches(*argv, "window") == 0) {
852 unsigned win;
853 NEXT_ARG();
854 if (strcmp(*argv, "lock") == 0) {
855 mxlock |= (1<<RTAX_WINDOW);
856 NEXT_ARG();
857 }
858 if (get_unsigned(&win, *argv, 0))
859 invarg("\"window\" value is invalid\n", *argv);
860 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
861 } else if (matches(*argv, "cwnd") == 0) {
862 unsigned win;
863 NEXT_ARG();
864 if (strcmp(*argv, "lock") == 0) {
865 mxlock |= (1<<RTAX_CWND);
866 NEXT_ARG();
867 }
868 if (get_unsigned(&win, *argv, 0))
869 invarg("\"cwnd\" value is invalid\n", *argv);
870 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
871 } else if (matches(*argv, "initcwnd") == 0) {
872 unsigned win;
873 NEXT_ARG();
874 if (strcmp(*argv, "lock") == 0) {
875 mxlock |= (1<<RTAX_INITCWND);
876 NEXT_ARG();
877 }
878 if (get_unsigned(&win, *argv, 0))
879 invarg("\"initcwnd\" value is invalid\n", *argv);
880 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
881 } else if (matches(*argv, "initrwnd") == 0) {
882 unsigned win;
883 NEXT_ARG();
884 if (strcmp(*argv, "lock") == 0) {
885 mxlock |= (1<<RTAX_INITRWND);
886 NEXT_ARG();
887 }
888 if (get_unsigned(&win, *argv, 0))
889 invarg("\"initrwnd\" value is invalid\n", *argv);
890 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITRWND, win);
891 } else if (matches(*argv, "quickack") == 0) {
892 unsigned quickack;
893 NEXT_ARG();
894 if (get_unsigned(&quickack, *argv, 0))
895 invarg("\"quickack\" value is invalid\n", *argv);
896 if (quickack != 1 && quickack != 0)
897 invarg("\"quickack\" value should be 0 or 1\n", *argv);
898 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_QUICKACK, quickack);
899 } else if (matches(*argv, "rttvar") == 0) {
900 unsigned win;
901 NEXT_ARG();
902 if (strcmp(*argv, "lock") == 0) {
903 mxlock |= (1<<RTAX_RTTVAR);
904 NEXT_ARG();
905 }
906 if (get_time_rtt(&win, *argv, &raw))
907 invarg("\"rttvar\" value is invalid\n", *argv);
908 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
909 (raw) ? win : win * 4);
910 } else if (matches(*argv, "ssthresh") == 0) {
911 unsigned win;
912 NEXT_ARG();
913 if (strcmp(*argv, "lock") == 0) {
914 mxlock |= (1<<RTAX_SSTHRESH);
915 NEXT_ARG();
916 }
917 if (get_unsigned(&win, *argv, 0))
918 invarg("\"ssthresh\" value is invalid\n", *argv);
919 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
920 } else if (matches(*argv, "realms") == 0) {
921 __u32 realm;
922 NEXT_ARG();
923 if (get_rt_realms(&realm, *argv))
924 invarg("\"realm\" value is invalid\n", *argv);
925 addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
926 } else if (strcmp(*argv, "onlink") == 0) {
927 req.r.rtm_flags |= RTNH_F_ONLINK;
928 } else if (strcmp(*argv, "nexthop") == 0) {
929 nhs_ok = 1;
930 break;
931 } else if (matches(*argv, "protocol") == 0) {
932 __u32 prot;
933 NEXT_ARG();
934 if (rtnl_rtprot_a2n(&prot, *argv))
935 invarg("\"protocol\" value is invalid\n", *argv);
936 req.r.rtm_protocol = prot;
937 } else if (matches(*argv, "table") == 0) {
938 __u32 tid;
939 NEXT_ARG();
940 if (rtnl_rttable_a2n(&tid, *argv))
941 invarg("\"table\" value is invalid\n", *argv);
942 if (tid < 256)
943 req.r.rtm_table = tid;
944 else {
945 req.r.rtm_table = RT_TABLE_UNSPEC;
946 addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
947 }
948 table_ok = 1;
949 } else if (strcmp(*argv, "dev") == 0 ||
950 strcmp(*argv, "oif") == 0) {
951 NEXT_ARG();
952 d = *argv;
953 } else {
954 int type;
955 inet_prefix dst;
956
957 if (strcmp(*argv, "to") == 0) {
958 NEXT_ARG();
959 }
960 if ((**argv < '0' || **argv > '9') &&
961 rtnl_rtntype_a2n(&type, *argv) == 0) {
962 NEXT_ARG();
963 req.r.rtm_type = type;
964 }
965
966 if (matches(*argv, "help") == 0)
967 usage();
968 if (dst_ok)
969 duparg2("to", *argv);
970 get_prefix(&dst, *argv, req.r.rtm_family);
971 if (req.r.rtm_family == AF_UNSPEC)
972 req.r.rtm_family = dst.family;
973 req.r.rtm_dst_len = dst.bitlen;
974 dst_ok = 1;
975 if (dst.bytelen)
976 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
977 }
978 argc--; argv++;
979 }
980
981 if (d || nhs_ok) {
982 int idx;
983
984 if (d) {
985 if ((idx = ll_name_to_index(d)) == 0) {
986 fprintf(stderr, "Cannot find device \"%s\"\n", d);
987 return -1;
988 }
989 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
990 }
991 }
992
993 if (mxrta->rta_len > RTA_LENGTH(0)) {
994 if (mxlock)
995 rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
996 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
997 }
998
999 if (nhs_ok)
1000 parse_nexthops(&req.n, &req.r, argc, argv);
1001
1002 if (!table_ok) {
1003 if (req.r.rtm_type == RTN_LOCAL ||
1004 req.r.rtm_type == RTN_BROADCAST ||
1005 req.r.rtm_type == RTN_NAT ||
1006 req.r.rtm_type == RTN_ANYCAST)
1007 req.r.rtm_table = RT_TABLE_LOCAL;
1008 }
1009 if (!scope_ok) {
1010 if (req.r.rtm_type == RTN_LOCAL ||
1011 req.r.rtm_type == RTN_NAT)
1012 req.r.rtm_scope = RT_SCOPE_HOST;
1013 else if (req.r.rtm_type == RTN_BROADCAST ||
1014 req.r.rtm_type == RTN_MULTICAST ||
1015 req.r.rtm_type == RTN_ANYCAST)
1016 req.r.rtm_scope = RT_SCOPE_LINK;
1017 else if (req.r.rtm_type == RTN_UNICAST ||
1018 req.r.rtm_type == RTN_UNSPEC) {
1019 if (cmd == RTM_DELROUTE)
1020 req.r.rtm_scope = RT_SCOPE_NOWHERE;
1021 else if (!gw_ok && !nhs_ok)
1022 req.r.rtm_scope = RT_SCOPE_LINK;
1023 }
1024 }
1025
1026 if (req.r.rtm_family == AF_UNSPEC)
1027 req.r.rtm_family = AF_INET;
1028
1029 if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
1030 exit(2);
1031
1032 return 0;
1033 }
1034
1035 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
1036 {
1037 struct {
1038 struct nlmsghdr nlh;
1039 struct rtmsg rtm;
1040 } req;
1041 struct sockaddr_nl nladdr;
1042
1043 memset(&nladdr, 0, sizeof(nladdr));
1044 memset(&req, 0, sizeof(req));
1045 nladdr.nl_family = AF_NETLINK;
1046
1047 req.nlh.nlmsg_len = sizeof(req);
1048 req.nlh.nlmsg_type = RTM_GETROUTE;
1049 req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
1050 req.nlh.nlmsg_pid = 0;
1051 req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
1052 req.rtm.rtm_family = family;
1053 req.rtm.rtm_flags |= RTM_F_CLONED;
1054
1055 return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
1056 }
1057
1058 static int iproute_flush_cache(void)
1059 {
1060 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
1061
1062 int len;
1063 int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
1064 char *buffer = "-1";
1065
1066 if (flush_fd < 0) {
1067 fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
1068 return -1;
1069 }
1070
1071 len = strlen (buffer);
1072
1073 if ((write (flush_fd, (void *)buffer, len)) < len) {
1074 fprintf (stderr, "Cannot flush routing cache\n");
1075 close(flush_fd);
1076 return -1;
1077 }
1078 close(flush_fd);
1079 return 0;
1080 }
1081
1082 static __u32 route_dump_magic = 0x45311224;
1083
1084 static int save_route(const struct sockaddr_nl *who, struct nlmsghdr *n,
1085 void *arg)
1086 {
1087 int ret;
1088 int len = n->nlmsg_len;
1089 struct rtmsg *r = NLMSG_DATA(n);
1090 struct rtattr *tb[RTA_MAX+1];
1091 int host_len = -1;
1092
1093 host_len = calc_host_len(r);
1094 len -= NLMSG_LENGTH(sizeof(*r));
1095 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1096
1097 if (!filter_nlmsg(n, tb, host_len))
1098 return 0;
1099
1100 ret = write(STDOUT_FILENO, n, n->nlmsg_len);
1101 if ((ret > 0) && (ret != n->nlmsg_len)) {
1102 fprintf(stderr, "Short write while saving nlmsg\n");
1103 ret = -EIO;
1104 }
1105
1106 return ret == n->nlmsg_len ? 0 : ret;
1107 }
1108
1109 static int save_route_prep(void)
1110 {
1111 int ret;
1112
1113 if (isatty(STDOUT_FILENO)) {
1114 fprintf(stderr, "Not sending a binary stream to stdout\n");
1115 return -1;
1116 }
1117
1118 ret = write(STDOUT_FILENO, &route_dump_magic, sizeof(route_dump_magic));
1119 if (ret != sizeof(route_dump_magic)) {
1120 fprintf(stderr, "Can't write magic to dump file\n");
1121 return -1;
1122 }
1123
1124 return 0;
1125 }
1126
1127 static int iproute_list_flush_or_save(int argc, char **argv, int action)
1128 {
1129 int do_ipv6 = preferred_family;
1130 char *id = NULL;
1131 char *od = NULL;
1132 unsigned int mark = 0;
1133 rtnl_filter_t filter_fn;
1134
1135 if (action == IPROUTE_SAVE) {
1136 if (save_route_prep())
1137 return -1;
1138
1139 filter_fn = save_route;
1140 } else
1141 filter_fn = print_route;
1142
1143 iproute_reset_filter();
1144 filter.tb = RT_TABLE_MAIN;
1145
1146 if ((action == IPROUTE_FLUSH) && argc <= 0) {
1147 fprintf(stderr, "\"ip route flush\" requires arguments.\n");
1148 return -1;
1149 }
1150
1151 while (argc > 0) {
1152 if (matches(*argv, "table") == 0) {
1153 __u32 tid;
1154 NEXT_ARG();
1155 if (rtnl_rttable_a2n(&tid, *argv)) {
1156 if (strcmp(*argv, "all") == 0) {
1157 filter.tb = 0;
1158 } else if (strcmp(*argv, "cache") == 0) {
1159 filter.cloned = 1;
1160 } else if (strcmp(*argv, "help") == 0) {
1161 usage();
1162 } else {
1163 invarg("table id value is invalid\n", *argv);
1164 }
1165 } else
1166 filter.tb = tid;
1167 } else if (matches(*argv, "cached") == 0 ||
1168 matches(*argv, "cloned") == 0) {
1169 filter.cloned = 1;
1170 } else if (strcmp(*argv, "tos") == 0 ||
1171 matches(*argv, "dsfield") == 0) {
1172 __u32 tos;
1173 NEXT_ARG();
1174 if (rtnl_dsfield_a2n(&tos, *argv))
1175 invarg("TOS value is invalid\n", *argv);
1176 filter.tos = tos;
1177 filter.tosmask = -1;
1178 } else if (matches(*argv, "protocol") == 0) {
1179 __u32 prot = 0;
1180 NEXT_ARG();
1181 filter.protocolmask = -1;
1182 if (rtnl_rtprot_a2n(&prot, *argv)) {
1183 if (strcmp(*argv, "all") != 0)
1184 invarg("invalid \"protocol\"\n", *argv);
1185 prot = 0;
1186 filter.protocolmask = 0;
1187 }
1188 filter.protocol = prot;
1189 } else if (matches(*argv, "scope") == 0) {
1190 __u32 scope = 0;
1191 NEXT_ARG();
1192 filter.scopemask = -1;
1193 if (rtnl_rtscope_a2n(&scope, *argv)) {
1194 if (strcmp(*argv, "all") != 0)
1195 invarg("invalid \"scope\"\n", *argv);
1196 scope = RT_SCOPE_NOWHERE;
1197 filter.scopemask = 0;
1198 }
1199 filter.scope = scope;
1200 } else if (matches(*argv, "type") == 0) {
1201 int type;
1202 NEXT_ARG();
1203 filter.typemask = -1;
1204 if (rtnl_rtntype_a2n(&type, *argv))
1205 invarg("node type value is invalid\n", *argv);
1206 filter.type = type;
1207 } else if (strcmp(*argv, "dev") == 0 ||
1208 strcmp(*argv, "oif") == 0) {
1209 NEXT_ARG();
1210 od = *argv;
1211 } else if (strcmp(*argv, "iif") == 0) {
1212 NEXT_ARG();
1213 id = *argv;
1214 } else if (strcmp(*argv, "mark") == 0) {
1215 NEXT_ARG();
1216 get_unsigned(&mark, *argv, 0);
1217 filter.markmask = -1;
1218 } else if (strcmp(*argv, "via") == 0) {
1219 NEXT_ARG();
1220 get_prefix(&filter.rvia, *argv, do_ipv6);
1221 } else if (strcmp(*argv, "src") == 0) {
1222 NEXT_ARG();
1223 get_prefix(&filter.rprefsrc, *argv, do_ipv6);
1224 } else if (matches(*argv, "realms") == 0) {
1225 __u32 realm;
1226 NEXT_ARG();
1227 if (get_rt_realms(&realm, *argv))
1228 invarg("invalid realms\n", *argv);
1229 filter.realm = realm;
1230 filter.realmmask = ~0U;
1231 if ((filter.realm&0xFFFF) == 0 &&
1232 (*argv)[strlen(*argv) - 1] == '/')
1233 filter.realmmask &= ~0xFFFF;
1234 if ((filter.realm&0xFFFF0000U) == 0 &&
1235 (strchr(*argv, '/') == NULL ||
1236 (*argv)[0] == '/'))
1237 filter.realmmask &= ~0xFFFF0000U;
1238 } else if (matches(*argv, "from") == 0) {
1239 NEXT_ARG();
1240 if (matches(*argv, "root") == 0) {
1241 NEXT_ARG();
1242 get_prefix(&filter.rsrc, *argv, do_ipv6);
1243 } else if (matches(*argv, "match") == 0) {
1244 NEXT_ARG();
1245 get_prefix(&filter.msrc, *argv, do_ipv6);
1246 } else {
1247 if (matches(*argv, "exact") == 0) {
1248 NEXT_ARG();
1249 }
1250 get_prefix(&filter.msrc, *argv, do_ipv6);
1251 filter.rsrc = filter.msrc;
1252 }
1253 } else {
1254 if (matches(*argv, "to") == 0) {
1255 NEXT_ARG();
1256 }
1257 if (matches(*argv, "root") == 0) {
1258 NEXT_ARG();
1259 get_prefix(&filter.rdst, *argv, do_ipv6);
1260 } else if (matches(*argv, "match") == 0) {
1261 NEXT_ARG();
1262 get_prefix(&filter.mdst, *argv, do_ipv6);
1263 } else {
1264 if (matches(*argv, "exact") == 0) {
1265 NEXT_ARG();
1266 }
1267 get_prefix(&filter.mdst, *argv, do_ipv6);
1268 filter.rdst = filter.mdst;
1269 }
1270 }
1271 argc--; argv++;
1272 }
1273
1274 if (do_ipv6 == AF_UNSPEC && filter.tb)
1275 do_ipv6 = AF_INET;
1276
1277 if (id || od) {
1278 int idx;
1279
1280 if (id) {
1281 if ((idx = ll_name_to_index(id)) == 0) {
1282 fprintf(stderr, "Cannot find device \"%s\"\n", id);
1283 return -1;
1284 }
1285 filter.iif = idx;
1286 filter.iifmask = -1;
1287 }
1288 if (od) {
1289 if ((idx = ll_name_to_index(od)) == 0) {
1290 fprintf(stderr, "Cannot find device \"%s\"\n", od);
1291 return -1;
1292 }
1293 filter.oif = idx;
1294 filter.oifmask = -1;
1295 }
1296 }
1297 filter.mark = mark;
1298
1299 if (action == IPROUTE_FLUSH) {
1300 int round = 0;
1301 char flushb[4096-512];
1302 time_t start = time(0);
1303
1304 if (filter.cloned) {
1305 if (do_ipv6 != AF_INET6) {
1306 iproute_flush_cache();
1307 if (show_stats)
1308 printf("*** IPv4 routing cache is flushed.\n");
1309 }
1310 if (do_ipv6 == AF_INET)
1311 return 0;
1312 }
1313
1314 filter.flushb = flushb;
1315 filter.flushp = 0;
1316 filter.flushe = sizeof(flushb);
1317
1318 for (;;) {
1319 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1320 perror("Cannot send dump request");
1321 exit(1);
1322 }
1323 filter.flushed = 0;
1324 if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1325 fprintf(stderr, "Flush terminated\n");
1326 exit(1);
1327 }
1328 if (filter.flushed == 0) {
1329 if (show_stats) {
1330 if (round == 0 && (!filter.cloned || do_ipv6 == AF_INET6))
1331 printf("Nothing to flush.\n");
1332 else
1333 printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":"");
1334 }
1335 fflush(stdout);
1336 return 0;
1337 }
1338 round++;
1339 if (flush_update() < 0)
1340 exit(1);
1341
1342 if (time(0) - start > 30) {
1343 printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
1344 (long)(time(0) - start), filter.flushed);
1345 exit(1);
1346 }
1347
1348 if (show_stats) {
1349 printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
1350 fflush(stdout);
1351 }
1352 }
1353 }
1354
1355 if (!filter.cloned) {
1356 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1357 perror("Cannot send dump request");
1358 exit(1);
1359 }
1360 } else {
1361 if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
1362 perror("Cannot send dump request");
1363 exit(1);
1364 }
1365 }
1366
1367 if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1368 fprintf(stderr, "Dump terminated\n");
1369 exit(1);
1370 }
1371
1372 exit(0);
1373 }
1374
1375
1376 static int iproute_get(int argc, char **argv)
1377 {
1378 struct {
1379 struct nlmsghdr n;
1380 struct rtmsg r;
1381 char buf[1024];
1382 } req;
1383 char *idev = NULL;
1384 char *odev = NULL;
1385 int connected = 0;
1386 int from_ok = 0;
1387 unsigned int mark = 0;
1388
1389 memset(&req, 0, sizeof(req));
1390
1391 iproute_reset_filter();
1392 filter.cloned = 2;
1393
1394 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
1395 req.n.nlmsg_flags = NLM_F_REQUEST;
1396 req.n.nlmsg_type = RTM_GETROUTE;
1397 req.r.rtm_family = preferred_family;
1398 req.r.rtm_table = 0;
1399 req.r.rtm_protocol = 0;
1400 req.r.rtm_scope = 0;
1401 req.r.rtm_type = 0;
1402 req.r.rtm_src_len = 0;
1403 req.r.rtm_dst_len = 0;
1404 req.r.rtm_tos = 0;
1405
1406 while (argc > 0) {
1407 if (strcmp(*argv, "tos") == 0 ||
1408 matches(*argv, "dsfield") == 0) {
1409 __u32 tos;
1410 NEXT_ARG();
1411 if (rtnl_dsfield_a2n(&tos, *argv))
1412 invarg("TOS value is invalid\n", *argv);
1413 req.r.rtm_tos = tos;
1414 } else if (matches(*argv, "from") == 0) {
1415 inet_prefix addr;
1416 NEXT_ARG();
1417 if (matches(*argv, "help") == 0)
1418 usage();
1419 from_ok = 1;
1420 get_prefix(&addr, *argv, req.r.rtm_family);
1421 if (req.r.rtm_family == AF_UNSPEC)
1422 req.r.rtm_family = addr.family;
1423 if (addr.bytelen)
1424 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
1425 req.r.rtm_src_len = addr.bitlen;
1426 } else if (matches(*argv, "iif") == 0) {
1427 NEXT_ARG();
1428 idev = *argv;
1429 } else if (matches(*argv, "mark") == 0) {
1430 NEXT_ARG();
1431 get_unsigned(&mark, *argv, 0);
1432 } else if (matches(*argv, "oif") == 0 ||
1433 strcmp(*argv, "dev") == 0) {
1434 NEXT_ARG();
1435 odev = *argv;
1436 } else if (matches(*argv, "notify") == 0) {
1437 req.r.rtm_flags |= RTM_F_NOTIFY;
1438 } else if (matches(*argv, "connected") == 0) {
1439 connected = 1;
1440 } else {
1441 inet_prefix addr;
1442 if (strcmp(*argv, "to") == 0) {
1443 NEXT_ARG();
1444 }
1445 if (matches(*argv, "help") == 0)
1446 usage();
1447 get_prefix(&addr, *argv, req.r.rtm_family);
1448 if (req.r.rtm_family == AF_UNSPEC)
1449 req.r.rtm_family = addr.family;
1450 if (addr.bytelen)
1451 addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
1452 req.r.rtm_dst_len = addr.bitlen;
1453 }
1454 argc--; argv++;
1455 }
1456
1457 if (req.r.rtm_dst_len == 0) {
1458 fprintf(stderr, "need at least a destination address\n");
1459 exit(1);
1460 }
1461
1462 if (idev || odev) {
1463 int idx;
1464
1465 if (idev) {
1466 if ((idx = ll_name_to_index(idev)) == 0) {
1467 fprintf(stderr, "Cannot find device \"%s\"\n", idev);
1468 return -1;
1469 }
1470 addattr32(&req.n, sizeof(req), RTA_IIF, idx);
1471 }
1472 if (odev) {
1473 if ((idx = ll_name_to_index(odev)) == 0) {
1474 fprintf(stderr, "Cannot find device \"%s\"\n", odev);
1475 return -1;
1476 }
1477 addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1478 }
1479 }
1480 if (mark)
1481 addattr32(&req.n, sizeof(req), RTA_MARK, mark);
1482
1483 if (req.r.rtm_family == AF_UNSPEC)
1484 req.r.rtm_family = AF_INET;
1485
1486 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0)
1487 exit(2);
1488
1489 if (connected && !from_ok) {
1490 struct rtmsg *r = NLMSG_DATA(&req.n);
1491 int len = req.n.nlmsg_len;
1492 struct rtattr * tb[RTA_MAX+1];
1493
1494 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1495 fprintf(stderr, "An error :-)\n");
1496 exit(1);
1497 }
1498
1499 if (req.n.nlmsg_type != RTM_NEWROUTE) {
1500 fprintf(stderr, "Not a route?\n");
1501 return -1;
1502 }
1503 len -= NLMSG_LENGTH(sizeof(*r));
1504 if (len < 0) {
1505 fprintf(stderr, "Wrong len %d\n", len);
1506 return -1;
1507 }
1508
1509 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1510
1511 if (tb[RTA_PREFSRC]) {
1512 tb[RTA_PREFSRC]->rta_type = RTA_SRC;
1513 r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
1514 } else if (!tb[RTA_SRC]) {
1515 fprintf(stderr, "Failed to connect the route\n");
1516 return -1;
1517 }
1518 if (!odev && tb[RTA_OIF])
1519 tb[RTA_OIF]->rta_type = 0;
1520 if (tb[RTA_GATEWAY])
1521 tb[RTA_GATEWAY]->rta_type = 0;
1522 if (!idev && tb[RTA_IIF])
1523 tb[RTA_IIF]->rta_type = 0;
1524 req.n.nlmsg_flags = NLM_F_REQUEST;
1525 req.n.nlmsg_type = RTM_GETROUTE;
1526
1527 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0)
1528 exit(2);
1529 }
1530
1531 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1532 fprintf(stderr, "An error :-)\n");
1533 exit(1);
1534 }
1535
1536 exit(0);
1537 }
1538
1539 static int restore_handler(const struct sockaddr_nl *nl, struct nlmsghdr *n,
1540 void *arg)
1541 {
1542 int ret;
1543
1544 n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
1545
1546 ll_init_map(&rth);
1547
1548 ret = rtnl_talk(&rth, n, 0, 0, n);
1549 if ((ret < 0) && (errno == EEXIST))
1550 ret = 0;
1551
1552 return ret;
1553 }
1554
1555 static int route_dump_check_magic(void)
1556 {
1557 int ret;
1558 __u32 magic = 0;
1559
1560 if (isatty(STDIN_FILENO)) {
1561 fprintf(stderr, "Can't restore route dump from a terminal\n");
1562 return -1;
1563 }
1564
1565 ret = fread(&magic, sizeof(magic), 1, stdin);
1566 if (magic != route_dump_magic) {
1567 fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n", ret, magic);
1568 return -1;
1569 }
1570
1571 return 0;
1572 }
1573
1574 static int iproute_restore(void)
1575 {
1576 if (route_dump_check_magic())
1577 exit(-1);
1578
1579 exit(rtnl_from_file(stdin, &restore_handler, NULL));
1580 }
1581
1582 static int show_handler(const struct sockaddr_nl *nl, struct nlmsghdr *n, void *arg)
1583 {
1584 print_route(nl, n, stdout);
1585 return 0;
1586 }
1587
1588 static int iproute_showdump(void)
1589 {
1590 if (route_dump_check_magic())
1591 exit(-1);
1592
1593 exit(rtnl_from_file(stdin, &show_handler, NULL));
1594 }
1595
1596 void iproute_reset_filter(void)
1597 {
1598 memset(&filter, 0, sizeof(filter));
1599 filter.mdst.bitlen = -1;
1600 filter.msrc.bitlen = -1;
1601 }
1602
1603 int do_iproute(int argc, char **argv)
1604 {
1605 if (argc < 1)
1606 return iproute_list_flush_or_save(0, NULL, IPROUTE_LIST);
1607
1608 if (matches(*argv, "add") == 0)
1609 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
1610 argc-1, argv+1);
1611 if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
1612 return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
1613 argc-1, argv+1);
1614 if (matches(*argv, "replace") == 0)
1615 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
1616 argc-1, argv+1);
1617 if (matches(*argv, "prepend") == 0)
1618 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
1619 argc-1, argv+1);
1620 if (matches(*argv, "append") == 0)
1621 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
1622 argc-1, argv+1);
1623 if (matches(*argv, "test") == 0)
1624 return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
1625 argc-1, argv+1);
1626 if (matches(*argv, "delete") == 0)
1627 return iproute_modify(RTM_DELROUTE, 0,
1628 argc-1, argv+1);
1629 if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
1630 || matches(*argv, "lst") == 0)
1631 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_LIST);
1632 if (matches(*argv, "get") == 0)
1633 return iproute_get(argc-1, argv+1);
1634 if (matches(*argv, "flush") == 0)
1635 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_FLUSH);
1636 if (matches(*argv, "save") == 0)
1637 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_SAVE);
1638 if (matches(*argv, "restore") == 0)
1639 return iproute_restore();
1640 if (matches(*argv, "showdump") == 0)
1641 return iproute_showdump();
1642 if (matches(*argv, "help") == 0)
1643 usage();
1644 fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
1645 exit(-1);
1646 }
1647
Upstream mirror of iproute2