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 <linux/icmpv6.h>
27 #include <errno.h>
28 
29 #include "rt_names.h"
30 #include "utils.h"
31 #include "ip_common.h"
32 #include "iproute_lwtunnel.h"
33 
34 #ifndef RTAX_RTTVAR
35 #define RTAX_RTTVAR RTAX_HOPS
36 #endif
37 
38 enum list_action {
39 	IPROUTE_LIST,
40 	IPROUTE_FLUSH,
41 	IPROUTE_SAVE,
42 };
43 static const char *mx_names[RTAX_MAX+1] = {
44 	[RTAX_MTU]	= "mtu",
45 	[RTAX_WINDOW]	= "window",
46 	[RTAX_RTT]	= "rtt",
47 	[RTAX_RTTVAR]	= "rttvar",
48 	[RTAX_SSTHRESH] = "ssthresh",
49 	[RTAX_CWND]	= "cwnd",
50 	[RTAX_ADVMSS]	= "advmss",
51 	[RTAX_REORDERING] = "reordering",
52 	[RTAX_HOPLIMIT] = "hoplimit",
53 	[RTAX_INITCWND] = "initcwnd",
54 	[RTAX_FEATURES] = "features",
55 	[RTAX_RTO_MIN]	= "rto_min",
56 	[RTAX_INITRWND]	= "initrwnd",
57 	[RTAX_QUICKACK]	= "quickack",
58 	[RTAX_CC_ALGO]	= "congctl",
59 };
60 static void usage(void) __attribute__((noreturn));
61 
usage(void)62 static void usage(void)
63 {
64 	fprintf(stderr, "Usage: ip route { list | flush } SELECTOR\n");
65 	fprintf(stderr, "       ip route save SELECTOR\n");
66 	fprintf(stderr, "       ip route restore\n");
67 	fprintf(stderr, "       ip route showdump\n");
68 	fprintf(stderr, "       ip route get [ ROUTE_GET_FLAGS ] ADDRESS\n");
69 	fprintf(stderr, "                            [ from ADDRESS iif STRING ]\n");
70 	fprintf(stderr, "                            [ oif STRING ] [ tos TOS ]\n");
71 	fprintf(stderr, "                            [ mark NUMBER ] [ vrf NAME ]\n");
72 	fprintf(stderr, "                            [ uid NUMBER ]\n");
73 	fprintf(stderr, "       ip route { add | del | change | append | replace } ROUTE\n");
74 	fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
75 	fprintf(stderr, "            [ table TABLE_ID ] [ vrf NAME ] [ proto RTPROTO ]\n");
76 	fprintf(stderr, "            [ type TYPE ] [ scope SCOPE ]\n");
77 	fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
78 	fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
79 	fprintf(stderr, "             [ table TABLE_ID ] [ proto RTPROTO ]\n");
80 	fprintf(stderr, "             [ scope SCOPE ] [ metric METRIC ]\n");
81 	fprintf(stderr, "             [ ttl-propagate { enabled | disabled } ]\n");
82 	fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
83 	fprintf(stderr, "NH := [ encap ENCAPTYPE ENCAPHDR ] [ via [ FAMILY ] ADDRESS ]\n");
84 	fprintf(stderr, "	    [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
85 	fprintf(stderr, "FAMILY := [ inet | inet6 | ipx | dnet | mpls | bridge | link ]\n");
86 	fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ] [ as [ to ] ADDRESS ]\n");
87 	fprintf(stderr, "           [ rtt TIME ] [ rttvar TIME ] [ reordering NUMBER ]\n");
88 	fprintf(stderr, "           [ window NUMBER ] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
89 	fprintf(stderr, "           [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
90 	fprintf(stderr, "           [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n");
91 	fprintf(stderr, "           [ features FEATURES ] [ quickack BOOL ] [ congctl NAME ]\n");
92 	fprintf(stderr, "           [ pref PREF ] [ expires TIME ]\n");
93 	fprintf(stderr, "TYPE := { unicast | local | broadcast | multicast | throw |\n");
94 	fprintf(stderr, "          unreachable | prohibit | blackhole | nat }\n");
95 	fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
96 	fprintf(stderr, "SCOPE := [ host | link | global | NUMBER ]\n");
97 	fprintf(stderr, "NHFLAGS := [ onlink | pervasive ]\n");
98 	fprintf(stderr, "RTPROTO := [ kernel | boot | static | NUMBER ]\n");
99 	fprintf(stderr, "PREF := [ low | medium | high ]\n");
100 	fprintf(stderr, "TIME := NUMBER[s|ms]\n");
101 	fprintf(stderr, "BOOL := [1|0]\n");
102 	fprintf(stderr, "FEATURES := ecn\n");
103 	fprintf(stderr, "ENCAPTYPE := [ mpls | ip | ip6 | seg6 | seg6local ]\n");
104 	fprintf(stderr, "ENCAPHDR := [ MPLSLABEL | SEG6HDR ]\n");
105 	fprintf(stderr, "SEG6HDR := [ mode SEGMODE ] segs ADDR1,ADDRi,ADDRn [hmac HMACKEYID] [cleanup]\n");
106 	fprintf(stderr, "SEGMODE := [ encap | inline ]\n");
107 	fprintf(stderr, "ROUTE_GET_FLAGS := [ fibmatch ]\n");
108 	exit(-1);
109 }
110 
111 
112 static struct
113 {
114 	unsigned int tb;
115 	int cloned;
116 	int flushed;
117 	char *flushb;
118 	int flushp;
119 	int flushe;
120 	int protocol, protocolmask;
121 	int scope, scopemask;
122 	__u64 typemask;
123 	int tos, tosmask;
124 	int iif, iifmask;
125 	int oif, oifmask;
126 	int mark, markmask;
127 	int realm, realmmask;
128 	inet_prefix rprefsrc;
129 	inet_prefix rvia;
130 	inet_prefix rdst;
131 	inet_prefix mdst;
132 	inet_prefix rsrc;
133 	inet_prefix msrc;
134 } filter;
135 
flush_update(void)136 static int flush_update(void)
137 {
138 	if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
139 		perror("Failed to send flush request");
140 		return -2;
141 	}
142 	filter.flushp = 0;
143 	return 0;
144 }
145 
filter_nlmsg(struct nlmsghdr * n,struct rtattr ** tb,int host_len)146 static int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
147 {
148 	struct rtmsg *r = NLMSG_DATA(n);
149 	inet_prefix dst = { .family = r->rtm_family };
150 	inet_prefix src = { .family = r->rtm_family };
151 	inet_prefix via = { .family = r->rtm_family };
152 	inet_prefix prefsrc = { .family = r->rtm_family };
153 	__u32 table;
154 	static int ip6_multiple_tables;
155 
156 	table = rtm_get_table(r, tb);
157 
158 	if (preferred_family != AF_UNSPEC && r->rtm_family != preferred_family)
159 		return 0;
160 
161 	if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
162 		ip6_multiple_tables = 1;
163 
164 	if (filter.cloned == !(r->rtm_flags&RTM_F_CLONED))
165 		return 0;
166 
167 	if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
168 		if (filter.tb) {
169 			if (filter.tb == RT_TABLE_LOCAL) {
170 				if (r->rtm_type != RTN_LOCAL)
171 					return 0;
172 			} else if (filter.tb == RT_TABLE_MAIN) {
173 				if (r->rtm_type == RTN_LOCAL)
174 					return 0;
175 			} else {
176 				return 0;
177 			}
178 		}
179 	} else {
180 		if (filter.tb > 0 && filter.tb != table)
181 			return 0;
182 	}
183 	if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
184 		return 0;
185 	if ((filter.scope^r->rtm_scope)&filter.scopemask)
186 		return 0;
187 
188 	if (filter.typemask && !(filter.typemask & (1 << r->rtm_type)))
189 		return 0;
190 	if ((filter.tos^r->rtm_tos)&filter.tosmask)
191 		return 0;
192 	if (filter.rdst.family &&
193 	    (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len))
194 		return 0;
195 	if (filter.mdst.family &&
196 	    (r->rtm_family != filter.mdst.family ||
197 	     (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len)))
198 		return 0;
199 	if (filter.rsrc.family &&
200 	    (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len))
201 		return 0;
202 	if (filter.msrc.family &&
203 	    (r->rtm_family != filter.msrc.family ||
204 	     (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len)))
205 		return 0;
206 	if (filter.rvia.family) {
207 		int family = r->rtm_family;
208 
209 		if (tb[RTA_VIA]) {
210 			struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
211 
212 			family = via->rtvia_family;
213 		}
214 		if (family != filter.rvia.family)
215 			return 0;
216 	}
217 	if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
218 		return 0;
219 
220 	if (tb[RTA_DST])
221 		memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
222 	if (filter.rsrc.family || filter.msrc.family) {
223 		if (tb[RTA_SRC])
224 			memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
225 	}
226 	if (filter.rvia.bitlen > 0) {
227 		if (tb[RTA_GATEWAY])
228 			memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
229 		if (tb[RTA_VIA]) {
230 			size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
231 			struct rtvia *rtvia = RTA_DATA(tb[RTA_VIA]);
232 
233 			via.family = rtvia->rtvia_family;
234 			memcpy(&via.data, rtvia->rtvia_addr, len);
235 		}
236 	}
237 	if (filter.rprefsrc.bitlen > 0) {
238 		if (tb[RTA_PREFSRC])
239 			memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
240 	}
241 
242 	if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
243 		return 0;
244 	if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
245 	    inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
246 		return 0;
247 
248 	if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
249 		return 0;
250 	if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
251 	    inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
252 		return 0;
253 
254 	if (filter.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
255 		return 0;
256 	if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
257 		return 0;
258 	if (filter.realmmask) {
259 		__u32 realms = 0;
260 
261 		if (tb[RTA_FLOW])
262 			realms = rta_getattr_u32(tb[RTA_FLOW]);
263 		if ((realms^filter.realm)&filter.realmmask)
264 			return 0;
265 	}
266 	if (filter.iifmask) {
267 		int iif = 0;
268 
269 		if (tb[RTA_IIF])
270 			iif = rta_getattr_u32(tb[RTA_IIF]);
271 		if ((iif^filter.iif)&filter.iifmask)
272 			return 0;
273 	}
274 	if (filter.oifmask) {
275 		int oif = 0;
276 
277 		if (tb[RTA_OIF])
278 			oif = rta_getattr_u32(tb[RTA_OIF]);
279 		if ((oif^filter.oif)&filter.oifmask)
280 			return 0;
281 	}
282 	if (filter.markmask) {
283 		int mark = 0;
284 
285 		if (tb[RTA_MARK])
286 			mark = rta_getattr_u32(tb[RTA_MARK]);
287 		if ((mark ^ filter.mark) & filter.markmask)
288 			return 0;
289 	}
290 	if (filter.flushb &&
291 	    r->rtm_family == AF_INET6 &&
292 	    r->rtm_dst_len == 0 &&
293 	    r->rtm_type == RTN_UNREACHABLE &&
294 	    tb[RTA_PRIORITY] &&
295 	    rta_getattr_u32(tb[RTA_PRIORITY]) == -1)
296 		return 0;
297 
298 	return 1;
299 }
300 
print_rtax_features(FILE * fp,unsigned int features)301 static void print_rtax_features(FILE *fp, unsigned int features)
302 {
303 	unsigned int of = features;
304 
305 	if (features & RTAX_FEATURE_ECN) {
306 		fprintf(fp, "ecn ");
307 		features &= ~RTAX_FEATURE_ECN;
308 	}
309 
310 	if (features)
311 		fprintf(fp, "0x%x ", of);
312 }
313 
print_route(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)314 int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
315 {
316 	FILE *fp = (FILE *)arg;
317 	struct rtmsg *r = NLMSG_DATA(n);
318 	int len = n->nlmsg_len;
319 	struct rtattr *tb[RTA_MAX+1];
320 	int host_len, family;
321 	__u32 table;
322 	int ret;
323 
324 	SPRINT_BUF(b1);
325 	static int hz;
326 
327 	if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
328 		fprintf(stderr, "Not a route: %08x %08x %08x\n",
329 			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
330 		return -1;
331 	}
332 	if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
333 		return 0;
334 	len -= NLMSG_LENGTH(sizeof(*r));
335 	if (len < 0) {
336 		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
337 		return -1;
338 	}
339 
340 	host_len = af_bit_len(r->rtm_family);
341 
342 	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
343 	table = rtm_get_table(r, tb);
344 
345 	if (!filter_nlmsg(n, tb, host_len))
346 		return 0;
347 
348 	if (filter.flushb) {
349 		struct nlmsghdr *fn;
350 
351 		if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
352 			if ((ret = flush_update()) < 0)
353 				return ret;
354 		}
355 		fn = (struct nlmsghdr *)(filter.flushb + NLMSG_ALIGN(filter.flushp));
356 		memcpy(fn, n, n->nlmsg_len);
357 		fn->nlmsg_type = RTM_DELROUTE;
358 		fn->nlmsg_flags = NLM_F_REQUEST;
359 		fn->nlmsg_seq = ++rth.seq;
360 		filter.flushp = (((char *)fn) + n->nlmsg_len) - filter.flushb;
361 		filter.flushed++;
362 		if (show_stats < 2)
363 			return 0;
364 	}
365 
366 	if (n->nlmsg_type == RTM_DELROUTE)
367 		fprintf(fp, "Deleted ");
368 	if ((r->rtm_type != RTN_UNICAST || show_details > 0) &&
369 	    (!filter.typemask || (filter.typemask & (1 << r->rtm_type))))
370 		fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
371 
372 	if (tb[RTA_DST]) {
373 		family = get_real_family(r->rtm_type, r->rtm_family);
374 		if (r->rtm_dst_len != host_len) {
375 			fprintf(fp, "%s/%u ",
376 				rt_addr_n2a_rta(family, tb[RTA_DST]),
377 			        r->rtm_dst_len);
378 		} else {
379 			fprintf(fp, "%s ",
380 				format_host_rta(family, tb[RTA_DST]));
381 		}
382 	} else if (r->rtm_dst_len) {
383 		fprintf(fp, "0/%d ", r->rtm_dst_len);
384 	} else {
385 		fprintf(fp, "default ");
386 	}
387 	if (tb[RTA_SRC]) {
388 		family = get_real_family(r->rtm_type, r->rtm_family);
389 		if (r->rtm_src_len != host_len) {
390 			fprintf(fp, "from %s/%u ",
391 				rt_addr_n2a_rta(family, tb[RTA_SRC]),
392 			        r->rtm_src_len);
393 		} else {
394 			fprintf(fp, "from %s ",
395 				format_host_rta(family, tb[RTA_SRC]));
396 		}
397 	} else if (r->rtm_src_len) {
398 		fprintf(fp, "from 0/%u ", r->rtm_src_len);
399 	}
400 	if (tb[RTA_NEWDST]) {
401 		fprintf(fp, "as to %s ",
402 		        format_host_rta(r->rtm_family, tb[RTA_NEWDST]));
403 	}
404 
405 	if (tb[RTA_ENCAP])
406 		lwt_print_encap(fp, tb[RTA_ENCAP_TYPE], tb[RTA_ENCAP]);
407 
408 	if (r->rtm_tos && filter.tosmask != -1) {
409 		SPRINT_BUF(b1);
410 		fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
411 	}
412 
413 	if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
414 		fprintf(fp, "via %s ",
415 		        format_host_rta(r->rtm_family, tb[RTA_GATEWAY]));
416 	}
417 	if (tb[RTA_VIA]) {
418 		size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
419 		struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
420 
421 		fprintf(fp, "via %s %s ",
422 			family_name(via->rtvia_family),
423 			format_host(via->rtvia_family, len, via->rtvia_addr));
424 	}
425 	if (tb[RTA_OIF] && filter.oifmask != -1)
426 		fprintf(fp, "dev %s ", ll_index_to_name(rta_getattr_u32(tb[RTA_OIF])));
427 
428 	if (table && (table != RT_TABLE_MAIN || show_details > 0) && !filter.tb)
429 		fprintf(fp, "table %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
430 	if (!(r->rtm_flags&RTM_F_CLONED)) {
431 		if ((r->rtm_protocol != RTPROT_BOOT || show_details > 0) && filter.protocolmask != -1)
432 			fprintf(fp, "proto %s ", rtnl_rtprot_n2a(r->rtm_protocol, b1, sizeof(b1)));
433 		if ((r->rtm_scope != RT_SCOPE_UNIVERSE || show_details > 0) && filter.scopemask != -1)
434 			fprintf(fp, "scope %s ", rtnl_rtscope_n2a(r->rtm_scope, b1, sizeof(b1)));
435 	}
436 	if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
437 		/* Do not use format_host(). It is our local addr
438 		   and symbolic name will not be useful.
439 		 */
440 		fprintf(fp, "src %s ",
441 			rt_addr_n2a_rta(r->rtm_family, tb[RTA_PREFSRC]));
442 	}
443 	if (tb[RTA_PRIORITY])
444 		fprintf(fp, "metric %u ", rta_getattr_u32(tb[RTA_PRIORITY]));
445 	if (r->rtm_flags & RTNH_F_DEAD)
446 		fprintf(fp, "dead ");
447 	if (r->rtm_flags & RTNH_F_ONLINK)
448 		fprintf(fp, "onlink ");
449 	if (r->rtm_flags & RTNH_F_PERVASIVE)
450 		fprintf(fp, "pervasive ");
451 	if (r->rtm_flags & RTNH_F_OFFLOAD)
452 		fprintf(fp, "offload ");
453 	if (r->rtm_flags & RTM_F_NOTIFY)
454 		fprintf(fp, "notify ");
455 	if (r->rtm_flags & RTNH_F_LINKDOWN)
456 		fprintf(fp, "linkdown ");
457 	if (r->rtm_flags & RTNH_F_UNRESOLVED)
458 		fprintf(fp, "unresolved ");
459 	if (tb[RTA_MARK]) {
460 		unsigned int mark = rta_getattr_u32(tb[RTA_MARK]);
461 
462 		if (mark) {
463 			if (mark >= 16)
464 				fprintf(fp, "mark 0x%x ", mark);
465 			else
466 				fprintf(fp, "mark %u ", mark);
467 		}
468 	}
469 
470 	if (tb[RTA_FLOW] && filter.realmmask != ~0U) {
471 		__u32 to = rta_getattr_u32(tb[RTA_FLOW]);
472 		__u32 from = to>>16;
473 
474 		to &= 0xFFFF;
475 		fprintf(fp, "realm%s ", from ? "s" : "");
476 		if (from) {
477 			fprintf(fp, "%s/",
478 				rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
479 		}
480 		fprintf(fp, "%s ",
481 			rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
482 	}
483 
484 	if (tb[RTA_UID])
485 		fprintf(fp, "uid %u ", rta_getattr_u32(tb[RTA_UID]));
486 
487 	if ((r->rtm_flags&RTM_F_CLONED) && r->rtm_family == AF_INET) {
488 		__u32 flags = r->rtm_flags&~0xFFFF;
489 		int first = 1;
490 
491 		fprintf(fp, "%s    cache ", _SL_);
492 
493 #define PRTFL(fl, flname) if (flags&RTCF_##fl) { \
494   flags &= ~RTCF_##fl; \
495   fprintf(fp, "%s" flname "%s", first ? "<" : "", flags ? "," : "> "); \
496   first = 0; }
497 		PRTFL(LOCAL, "local");
498 		PRTFL(REJECT, "reject");
499 		PRTFL(MULTICAST, "mc");
500 		PRTFL(BROADCAST, "brd");
501 		PRTFL(DNAT, "dst-nat");
502 		PRTFL(SNAT, "src-nat");
503 		PRTFL(MASQ, "masq");
504 		PRTFL(DIRECTDST, "dst-direct");
505 		PRTFL(DIRECTSRC, "src-direct");
506 		PRTFL(REDIRECTED, "redirected");
507 		PRTFL(DOREDIRECT, "redirect");
508 		PRTFL(FAST, "fastroute");
509 		PRTFL(NOTIFY, "notify");
510 		PRTFL(TPROXY, "proxy");
511 
512 		if (flags)
513 			fprintf(fp, "%s%x> ", first ? "<" : "", flags);
514 		if (tb[RTA_CACHEINFO]) {
515 			struct rta_cacheinfo *ci = RTA_DATA(tb[RTA_CACHEINFO]);
516 
517 			if (!hz)
518 				hz = get_user_hz();
519 			if (ci->rta_expires != 0)
520 				fprintf(fp, "expires %dsec ", ci->rta_expires/hz);
521 			if (ci->rta_error != 0)
522 				fprintf(fp, "error %d ", ci->rta_error);
523 			if (show_stats) {
524 				if (ci->rta_clntref)
525 					fprintf(fp, "users %d ", ci->rta_clntref);
526 				if (ci->rta_used != 0)
527 					fprintf(fp, "used %d ", ci->rta_used);
528 				if (ci->rta_lastuse != 0)
529 					fprintf(fp, "age %dsec ", ci->rta_lastuse/hz);
530 			}
531 			if (ci->rta_id)
532 				fprintf(fp, "ipid 0x%04x ", ci->rta_id);
533 			if (ci->rta_ts || ci->rta_tsage)
534 				fprintf(fp, "ts 0x%x tsage %dsec ",
535 					ci->rta_ts, ci->rta_tsage);
536 		}
537 	} else if (r->rtm_family == AF_INET6) {
538 		struct rta_cacheinfo *ci = NULL;
539 
540 		if (tb[RTA_CACHEINFO])
541 			ci = RTA_DATA(tb[RTA_CACHEINFO]);
542 		if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
543 			if (!hz)
544 				hz = get_user_hz();
545 			if (r->rtm_flags & RTM_F_CLONED)
546 				fprintf(fp, "%s    cache ", _SL_);
547 			if (ci->rta_expires)
548 				fprintf(fp, "expires %dsec ", ci->rta_expires/hz);
549 			if (ci->rta_error != 0)
550 				fprintf(fp, "error %d ", ci->rta_error);
551 			if (show_stats) {
552 				if (ci->rta_clntref)
553 					fprintf(fp, "users %d ", ci->rta_clntref);
554 				if (ci->rta_used != 0)
555 					fprintf(fp, "used %d ", ci->rta_used);
556 				if (ci->rta_lastuse != 0)
557 					fprintf(fp, "age %dsec ", ci->rta_lastuse/hz);
558 			}
559 		} else if (ci) {
560 			if (ci->rta_error != 0)
561 				fprintf(fp, "error %d ", ci->rta_error);
562 		}
563 	}
564 	if (tb[RTA_METRICS]) {
565 		int i;
566 		unsigned int mxlock = 0;
567 		struct rtattr *mxrta[RTAX_MAX+1];
568 
569 		parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(tb[RTA_METRICS]),
570 			    RTA_PAYLOAD(tb[RTA_METRICS]));
571 		if (mxrta[RTAX_LOCK])
572 			mxlock = rta_getattr_u32(mxrta[RTAX_LOCK]);
573 
574 		for (i = 2; i <= RTAX_MAX; i++) {
575 			__u32 val = 0U;
576 
577 			if (mxrta[i] == NULL && !(mxlock & (1 << i)))
578 				continue;
579 
580 			if (mxrta[i] != NULL && i != RTAX_CC_ALGO)
581 				val = rta_getattr_u32(mxrta[i]);
582 
583 			if (i == RTAX_HOPLIMIT && (int)val == -1)
584 				continue;
585 
586 			if (i < sizeof(mx_names)/sizeof(char *) && mx_names[i])
587 				fprintf(fp, "%s ", mx_names[i]);
588 			else
589 				fprintf(fp, "metric %d ", i);
590 
591 			if (mxlock & (1<<i))
592 				fprintf(fp, "lock ");
593 
594 			switch (i) {
595 			case RTAX_FEATURES:
596 				print_rtax_features(fp, val);
597 				break;
598 			default:
599 				fprintf(fp, "%u ", val);
600 				break;
601 
602 			case RTAX_RTT:
603 			case RTAX_RTTVAR:
604 			case RTAX_RTO_MIN:
605 				if (i == RTAX_RTT)
606 					val /= 8;
607 				else if (i == RTAX_RTTVAR)
608 					val /= 4;
609 
610 				if (val >= 1000)
611 					fprintf(fp, "%gs ", val/1e3);
612 				else
613 					fprintf(fp, "%ums ", val);
614 				break;
615 			case RTAX_CC_ALGO:
616 				fprintf(fp, "%s ", rta_getattr_str(mxrta[i]));
617 				break;
618 			}
619 		}
620 	}
621 	if (tb[RTA_IIF] && filter.iifmask != -1) {
622 		fprintf(fp, "iif %s ",
623 			ll_index_to_name(rta_getattr_u32(tb[RTA_IIF])));
624 	}
625 	if (tb[RTA_MULTIPATH]) {
626 		struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
627 		int first = 1;
628 
629 		len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
630 
631 		for (;;) {
632 			if (len < sizeof(*nh))
633 				break;
634 			if (nh->rtnh_len > len)
635 				break;
636 			if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
637 				if (first) {
638 					fprintf(fp, "Oifs: ");
639 					first = 0;
640 				} else {
641 					fprintf(fp, " ");
642 				}
643 			} else
644 				fprintf(fp, "%s\tnexthop ", _SL_);
645 			if (nh->rtnh_len > sizeof(*nh)) {
646 				parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh), nh->rtnh_len - sizeof(*nh));
647 
648 				if (tb[RTA_ENCAP])
649 					lwt_print_encap(fp,
650 							tb[RTA_ENCAP_TYPE],
651 							tb[RTA_ENCAP]);
652 				if (tb[RTA_NEWDST]) {
653 					fprintf(fp, "as to %s ",
654 						format_host_rta(r->rtm_family,
655 								tb[RTA_NEWDST]));
656 				}
657 				if (tb[RTA_GATEWAY]) {
658 					fprintf(fp, "via %s ",
659 						format_host_rta(r->rtm_family,
660 								tb[RTA_GATEWAY]));
661 				}
662 				if (tb[RTA_VIA]) {
663 					size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
664 					struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
665 
666 					fprintf(fp, "via %s %s ",
667 						family_name(via->rtvia_family),
668 						format_host(via->rtvia_family, len, via->rtvia_addr));
669 				}
670 				if (tb[RTA_FLOW]) {
671 					__u32 to = rta_getattr_u32(tb[RTA_FLOW]);
672 					__u32 from = to>>16;
673 
674 					to &= 0xFFFF;
675 					fprintf(fp, "realm%s ", from ? "s" : "");
676 					if (from) {
677 						fprintf(fp, "%s/",
678 							rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
679 					}
680 					fprintf(fp, "%s ",
681 						rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
682 				}
683 			}
684 			if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
685 				fprintf(fp, "%s", ll_index_to_name(nh->rtnh_ifindex));
686 				if (nh->rtnh_hops != 1)
687 					fprintf(fp, "(ttl>%d)", nh->rtnh_hops);
688 				fprintf(fp, " ");
689 			} else {
690 				fprintf(fp, "dev %s ", ll_index_to_name(nh->rtnh_ifindex));
691 				if (r->rtm_family != AF_MPLS)
692 					fprintf(fp, "weight %d ",
693 						nh->rtnh_hops+1);
694 			}
695 			if (nh->rtnh_flags & RTNH_F_DEAD)
696 				fprintf(fp, "dead ");
697 			if (nh->rtnh_flags & RTNH_F_ONLINK)
698 				fprintf(fp, "onlink ");
699 			if (nh->rtnh_flags & RTNH_F_PERVASIVE)
700 				fprintf(fp, "pervasive ");
701 			if (nh->rtnh_flags & RTNH_F_OFFLOAD)
702 				fprintf(fp, "offload ");
703 			if (nh->rtnh_flags & RTNH_F_LINKDOWN)
704 				fprintf(fp, "linkdown ");
705 			len -= NLMSG_ALIGN(nh->rtnh_len);
706 			nh = RTNH_NEXT(nh);
707 		}
708 	}
709 	if (tb[RTA_PREF]) {
710 		unsigned int pref = rta_getattr_u8(tb[RTA_PREF]);
711 
712 		fprintf(fp, "pref ");
713 
714 		switch (pref) {
715 		case ICMPV6_ROUTER_PREF_LOW:
716 			fprintf(fp, "low");
717 			break;
718 		case ICMPV6_ROUTER_PREF_MEDIUM:
719 			fprintf(fp, "medium");
720 			break;
721 		case ICMPV6_ROUTER_PREF_HIGH:
722 			fprintf(fp, "high");
723 			break;
724 		default:
725 			fprintf(fp, "%u", pref);
726 		}
727 	}
728 	if (tb[RTA_TTL_PROPAGATE]) {
729 		fprintf(fp, "ttl-propagate ");
730 		if (rta_getattr_u8(tb[RTA_TTL_PROPAGATE]))
731 			fprintf(fp, "enabled");
732 		else
733 			fprintf(fp, "disabled");
734 	}
735 	fprintf(fp, "\n");
736 	fflush(fp);
737 	return 0;
738 }
739 
parse_one_nh(struct nlmsghdr * n,struct rtmsg * r,struct rtattr * rta,struct rtnexthop * rtnh,int * argcp,char *** argvp)740 static int parse_one_nh(struct nlmsghdr *n, struct rtmsg *r,
741 			struct rtattr *rta, struct rtnexthop *rtnh,
742 			int *argcp, char ***argvp)
743 {
744 	int argc = *argcp;
745 	char **argv = *argvp;
746 
747 	while (++argv, --argc > 0) {
748 		if (strcmp(*argv, "via") == 0) {
749 			inet_prefix addr;
750 			int family;
751 
752 			NEXT_ARG();
753 			family = read_family(*argv);
754 			if (family == AF_UNSPEC)
755 				family = r->rtm_family;
756 			else
757 				NEXT_ARG();
758 			get_addr(&addr, *argv, family);
759 			if (r->rtm_family == AF_UNSPEC)
760 				r->rtm_family = addr.family;
761 			if (addr.family == r->rtm_family) {
762 				rta_addattr_l(rta, 4096, RTA_GATEWAY, &addr.data, addr.bytelen);
763 				rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
764 			} else {
765 				rta_addattr_l(rta, 4096, RTA_VIA, &addr.family, addr.bytelen+2);
766 				rtnh->rtnh_len += RTA_SPACE(addr.bytelen+2);
767 			}
768 		} else if (strcmp(*argv, "dev") == 0) {
769 			NEXT_ARG();
770 			if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
771 				fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
772 				return -1;
773 			}
774 		} else if (strcmp(*argv, "weight") == 0) {
775 			unsigned int w;
776 
777 			NEXT_ARG();
778 			if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
779 				invarg("\"weight\" is invalid\n", *argv);
780 			rtnh->rtnh_hops = w - 1;
781 		} else if (strcmp(*argv, "onlink") == 0) {
782 			rtnh->rtnh_flags |= RTNH_F_ONLINK;
783 		} else if (matches(*argv, "realms") == 0) {
784 			__u32 realm;
785 
786 			NEXT_ARG();
787 			if (get_rt_realms_or_raw(&realm, *argv))
788 				invarg("\"realm\" value is invalid\n", *argv);
789 			rta_addattr32(rta, 4096, RTA_FLOW, realm);
790 			rtnh->rtnh_len += sizeof(struct rtattr) + 4;
791 		} else if (strcmp(*argv, "encap") == 0) {
792 			int len = rta->rta_len;
793 
794 			lwt_parse_encap(rta, 4096, &argc, &argv);
795 			rtnh->rtnh_len += rta->rta_len - len;
796 		} else if (strcmp(*argv, "as") == 0) {
797 			inet_prefix addr;
798 
799 			NEXT_ARG();
800 			if (strcmp(*argv, "to") == 0)
801 				NEXT_ARG();
802 			get_addr(&addr, *argv, r->rtm_family);
803 			rta_addattr_l(rta, 4096, RTA_NEWDST, &addr.data,
804 				      addr.bytelen);
805 			rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
806 		} else
807 			break;
808 	}
809 	*argcp = argc;
810 	*argvp = argv;
811 	return 0;
812 }
813 
parse_nexthops(struct nlmsghdr * n,struct rtmsg * r,int argc,char ** argv)814 static int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r,
815 			  int argc, char **argv)
816 {
817 	char buf[1024];
818 	struct rtattr *rta = (void *)buf;
819 	struct rtnexthop *rtnh;
820 
821 	rta->rta_type = RTA_MULTIPATH;
822 	rta->rta_len = RTA_LENGTH(0);
823 	rtnh = RTA_DATA(rta);
824 
825 	while (argc > 0) {
826 		if (strcmp(*argv, "nexthop") != 0) {
827 			fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
828 			exit(-1);
829 		}
830 		if (argc <= 1) {
831 			fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
832 			exit(-1);
833 		}
834 		memset(rtnh, 0, sizeof(*rtnh));
835 		rtnh->rtnh_len = sizeof(*rtnh);
836 		rta->rta_len += rtnh->rtnh_len;
837 		parse_one_nh(n, r, rta, rtnh, &argc, &argv);
838 		rtnh = RTNH_NEXT(rtnh);
839 	}
840 
841 	if (rta->rta_len > RTA_LENGTH(0))
842 		addattr_l(n, 1024, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta));
843 	return 0;
844 }
845 
iproute_modify(int cmd,unsigned int flags,int argc,char ** argv)846 static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
847 {
848 	struct {
849 		struct nlmsghdr	n;
850 		struct rtmsg		r;
851 		char			buf[1024];
852 	} req = {
853 		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
854 		.n.nlmsg_flags = NLM_F_REQUEST | flags,
855 		.n.nlmsg_type = cmd,
856 		.r.rtm_family = preferred_family,
857 		.r.rtm_table = RT_TABLE_MAIN,
858 		.r.rtm_scope = RT_SCOPE_NOWHERE,
859 	};
860 	char  mxbuf[256];
861 	struct rtattr *mxrta = (void *)mxbuf;
862 	unsigned int mxlock = 0;
863 	char  *d = NULL;
864 	int gw_ok = 0;
865 	int dst_ok = 0;
866 	int nhs_ok = 0;
867 	int scope_ok = 0;
868 	int table_ok = 0;
869 	int raw = 0;
870 	int type_ok = 0;
871 
872 	if (cmd != RTM_DELROUTE) {
873 		req.r.rtm_protocol = RTPROT_BOOT;
874 		req.r.rtm_scope = RT_SCOPE_UNIVERSE;
875 		req.r.rtm_type = RTN_UNICAST;
876 	}
877 
878 	mxrta->rta_type = RTA_METRICS;
879 	mxrta->rta_len = RTA_LENGTH(0);
880 
881 	while (argc > 0) {
882 		if (strcmp(*argv, "src") == 0) {
883 			inet_prefix addr;
884 
885 			NEXT_ARG();
886 			get_addr(&addr, *argv, req.r.rtm_family);
887 			if (req.r.rtm_family == AF_UNSPEC)
888 				req.r.rtm_family = addr.family;
889 			addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
890 		} else if (strcmp(*argv, "as") == 0) {
891 			inet_prefix addr;
892 
893 			NEXT_ARG();
894 			if (strcmp(*argv, "to") == 0) {
895 				NEXT_ARG();
896 			}
897 			get_addr(&addr, *argv, req.r.rtm_family);
898 			if (req.r.rtm_family == AF_UNSPEC)
899 				req.r.rtm_family = addr.family;
900 			addattr_l(&req.n, sizeof(req), RTA_NEWDST, &addr.data, addr.bytelen);
901 		} else if (strcmp(*argv, "via") == 0) {
902 			inet_prefix addr;
903 			int family;
904 
905 			if (gw_ok) {
906 				invarg("use nexthop syntax to specify multiple via\n",
907 				       *argv);
908 			}
909 			gw_ok = 1;
910 			NEXT_ARG();
911 			family = read_family(*argv);
912 			if (family == AF_UNSPEC)
913 				family = req.r.rtm_family;
914 			else
915 				NEXT_ARG();
916 			get_addr(&addr, *argv, family);
917 			if (req.r.rtm_family == AF_UNSPEC)
918 				req.r.rtm_family = addr.family;
919 			if (addr.family == req.r.rtm_family)
920 				addattr_l(&req.n, sizeof(req), RTA_GATEWAY,
921 					  &addr.data, addr.bytelen);
922 			else
923 				addattr_l(&req.n, sizeof(req), RTA_VIA,
924 					  &addr.family, addr.bytelen+2);
925 		} else if (strcmp(*argv, "from") == 0) {
926 			inet_prefix addr;
927 
928 			NEXT_ARG();
929 			get_prefix(&addr, *argv, req.r.rtm_family);
930 			if (req.r.rtm_family == AF_UNSPEC)
931 				req.r.rtm_family = addr.family;
932 			if (addr.bytelen)
933 				addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
934 			req.r.rtm_src_len = addr.bitlen;
935 		} else if (strcmp(*argv, "tos") == 0 ||
936 			   matches(*argv, "dsfield") == 0) {
937 			__u32 tos;
938 
939 			NEXT_ARG();
940 			if (rtnl_dsfield_a2n(&tos, *argv))
941 				invarg("\"tos\" value is invalid\n", *argv);
942 			req.r.rtm_tos = tos;
943 		} else if (strcmp(*argv, "expires") == 0) {
944 			__u32 expires;
945 
946 			NEXT_ARG();
947 			if (get_u32(&expires, *argv, 0))
948 				invarg("\"expires\" value is invalid\n", *argv);
949 			addattr32(&req.n, sizeof(req), RTA_EXPIRES, expires);
950 		} else if (matches(*argv, "metric") == 0 ||
951 			   matches(*argv, "priority") == 0 ||
952 			   strcmp(*argv, "preference") == 0) {
953 			__u32 metric;
954 
955 			NEXT_ARG();
956 			if (get_u32(&metric, *argv, 0))
957 				invarg("\"metric\" value is invalid\n", *argv);
958 			addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
959 		} else if (strcmp(*argv, "scope") == 0) {
960 			__u32 scope = 0;
961 
962 			NEXT_ARG();
963 			if (rtnl_rtscope_a2n(&scope, *argv))
964 				invarg("invalid \"scope\" value\n", *argv);
965 			req.r.rtm_scope = scope;
966 			scope_ok = 1;
967 		} else if (strcmp(*argv, "mtu") == 0) {
968 			unsigned int mtu;
969 
970 			NEXT_ARG();
971 			if (strcmp(*argv, "lock") == 0) {
972 				mxlock |= (1<<RTAX_MTU);
973 				NEXT_ARG();
974 			}
975 			if (get_unsigned(&mtu, *argv, 0))
976 				invarg("\"mtu\" value is invalid\n", *argv);
977 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
978 		} else if (strcmp(*argv, "hoplimit") == 0) {
979 			unsigned int hoplimit;
980 
981 			NEXT_ARG();
982 			if (strcmp(*argv, "lock") == 0) {
983 				mxlock |= (1<<RTAX_HOPLIMIT);
984 				NEXT_ARG();
985 			}
986 			if (get_unsigned(&hoplimit, *argv, 0) || hoplimit > 255)
987 				invarg("\"hoplimit\" value is invalid\n", *argv);
988 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
989 		} else if (strcmp(*argv, "advmss") == 0) {
990 			unsigned int mss;
991 
992 			NEXT_ARG();
993 			if (strcmp(*argv, "lock") == 0) {
994 				mxlock |= (1<<RTAX_ADVMSS);
995 				NEXT_ARG();
996 			}
997 			if (get_unsigned(&mss, *argv, 0))
998 				invarg("\"mss\" value is invalid\n", *argv);
999 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
1000 		} else if (matches(*argv, "reordering") == 0) {
1001 			unsigned int reord;
1002 
1003 			NEXT_ARG();
1004 			if (strcmp(*argv, "lock") == 0) {
1005 				mxlock |= (1<<RTAX_REORDERING);
1006 				NEXT_ARG();
1007 			}
1008 			if (get_unsigned(&reord, *argv, 0))
1009 				invarg("\"reordering\" value is invalid\n", *argv);
1010 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
1011 		} else if (strcmp(*argv, "rtt") == 0) {
1012 			unsigned int rtt;
1013 
1014 			NEXT_ARG();
1015 			if (strcmp(*argv, "lock") == 0) {
1016 				mxlock |= (1<<RTAX_RTT);
1017 				NEXT_ARG();
1018 			}
1019 			if (get_time_rtt(&rtt, *argv, &raw))
1020 				invarg("\"rtt\" value is invalid\n", *argv);
1021 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
1022 				(raw) ? rtt : rtt * 8);
1023 		} else if (strcmp(*argv, "rto_min") == 0) {
1024 			unsigned int rto_min;
1025 
1026 			NEXT_ARG();
1027 			mxlock |= (1<<RTAX_RTO_MIN);
1028 			if (get_time_rtt(&rto_min, *argv, &raw))
1029 				invarg("\"rto_min\" value is invalid\n",
1030 				       *argv);
1031 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
1032 				      rto_min);
1033 		} else if (matches(*argv, "window") == 0) {
1034 			unsigned int win;
1035 
1036 			NEXT_ARG();
1037 			if (strcmp(*argv, "lock") == 0) {
1038 				mxlock |= (1<<RTAX_WINDOW);
1039 				NEXT_ARG();
1040 			}
1041 			if (get_unsigned(&win, *argv, 0))
1042 				invarg("\"window\" value is invalid\n", *argv);
1043 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
1044 		} else if (matches(*argv, "cwnd") == 0) {
1045 			unsigned int win;
1046 
1047 			NEXT_ARG();
1048 			if (strcmp(*argv, "lock") == 0) {
1049 				mxlock |= (1<<RTAX_CWND);
1050 				NEXT_ARG();
1051 			}
1052 			if (get_unsigned(&win, *argv, 0))
1053 				invarg("\"cwnd\" value is invalid\n", *argv);
1054 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
1055 		} else if (matches(*argv, "initcwnd") == 0) {
1056 			unsigned int win;
1057 
1058 			NEXT_ARG();
1059 			if (strcmp(*argv, "lock") == 0) {
1060 				mxlock |= (1<<RTAX_INITCWND);
1061 				NEXT_ARG();
1062 			}
1063 			if (get_unsigned(&win, *argv, 0))
1064 				invarg("\"initcwnd\" value is invalid\n", *argv);
1065 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
1066 		} else if (matches(*argv, "initrwnd") == 0) {
1067 			unsigned int win;
1068 
1069 			NEXT_ARG();
1070 			if (strcmp(*argv, "lock") == 0) {
1071 				mxlock |= (1<<RTAX_INITRWND);
1072 				NEXT_ARG();
1073 			}
1074 			if (get_unsigned(&win, *argv, 0))
1075 				invarg("\"initrwnd\" value is invalid\n", *argv);
1076 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITRWND, win);
1077 		} else if (matches(*argv, "features") == 0) {
1078 			unsigned int features = 0;
1079 
1080 			while (argc > 0) {
1081 				NEXT_ARG();
1082 
1083 				if (strcmp(*argv, "ecn") == 0)
1084 					features |= RTAX_FEATURE_ECN;
1085 				else
1086 					invarg("\"features\" value not valid\n", *argv);
1087 				break;
1088 			}
1089 
1090 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_FEATURES, features);
1091 		} else if (matches(*argv, "quickack") == 0) {
1092 			unsigned int quickack;
1093 
1094 			NEXT_ARG();
1095 			if (get_unsigned(&quickack, *argv, 0))
1096 				invarg("\"quickack\" value is invalid\n", *argv);
1097 			if (quickack != 1 && quickack != 0)
1098 				invarg("\"quickack\" value should be 0 or 1\n", *argv);
1099 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_QUICKACK, quickack);
1100 		} else if (matches(*argv, "congctl") == 0) {
1101 			NEXT_ARG();
1102 			if (strcmp(*argv, "lock") == 0) {
1103 				mxlock |= 1 << RTAX_CC_ALGO;
1104 				NEXT_ARG();
1105 			}
1106 			rta_addattr_l(mxrta, sizeof(mxbuf), RTAX_CC_ALGO, *argv,
1107 				      strlen(*argv));
1108 		} else if (matches(*argv, "rttvar") == 0) {
1109 			unsigned int win;
1110 
1111 			NEXT_ARG();
1112 			if (strcmp(*argv, "lock") == 0) {
1113 				mxlock |= (1<<RTAX_RTTVAR);
1114 				NEXT_ARG();
1115 			}
1116 			if (get_time_rtt(&win, *argv, &raw))
1117 				invarg("\"rttvar\" value is invalid\n", *argv);
1118 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
1119 				(raw) ? win : win * 4);
1120 		} else if (matches(*argv, "ssthresh") == 0) {
1121 			unsigned int win;
1122 
1123 			NEXT_ARG();
1124 			if (strcmp(*argv, "lock") == 0) {
1125 				mxlock |= (1<<RTAX_SSTHRESH);
1126 				NEXT_ARG();
1127 			}
1128 			if (get_unsigned(&win, *argv, 0))
1129 				invarg("\"ssthresh\" value is invalid\n", *argv);
1130 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
1131 		} else if (matches(*argv, "realms") == 0) {
1132 			__u32 realm;
1133 
1134 			NEXT_ARG();
1135 			if (get_rt_realms_or_raw(&realm, *argv))
1136 				invarg("\"realm\" value is invalid\n", *argv);
1137 			addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
1138 		} else if (strcmp(*argv, "onlink") == 0) {
1139 			req.r.rtm_flags |= RTNH_F_ONLINK;
1140 		} else if (strcmp(*argv, "nexthop") == 0) {
1141 			nhs_ok = 1;
1142 			break;
1143 		} else if (matches(*argv, "protocol") == 0) {
1144 			__u32 prot;
1145 
1146 			NEXT_ARG();
1147 			if (rtnl_rtprot_a2n(&prot, *argv))
1148 				invarg("\"protocol\" value is invalid\n", *argv);
1149 			req.r.rtm_protocol = prot;
1150 		} else if (matches(*argv, "table") == 0) {
1151 			__u32 tid;
1152 
1153 			NEXT_ARG();
1154 			if (rtnl_rttable_a2n(&tid, *argv))
1155 				invarg("\"table\" value is invalid\n", *argv);
1156 			if (tid < 256)
1157 				req.r.rtm_table = tid;
1158 			else {
1159 				req.r.rtm_table = RT_TABLE_UNSPEC;
1160 				addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
1161 			}
1162 			table_ok = 1;
1163 		} else if (matches(*argv, "vrf") == 0) {
1164 			__u32 tid;
1165 
1166 			NEXT_ARG();
1167 			tid = ipvrf_get_table(*argv);
1168 			if (tid == 0)
1169 				invarg("Invalid VRF\n", *argv);
1170 			if (tid < 256)
1171 				req.r.rtm_table = tid;
1172 			else {
1173 				req.r.rtm_table = RT_TABLE_UNSPEC;
1174 				addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
1175 			}
1176 			table_ok = 1;
1177 		} else if (strcmp(*argv, "dev") == 0 ||
1178 			   strcmp(*argv, "oif") == 0) {
1179 			NEXT_ARG();
1180 			d = *argv;
1181 		} else if (matches(*argv, "pref") == 0) {
1182 			__u8 pref;
1183 
1184 			NEXT_ARG();
1185 			if (strcmp(*argv, "low") == 0)
1186 				pref = ICMPV6_ROUTER_PREF_LOW;
1187 			else if (strcmp(*argv, "medium") == 0)
1188 				pref = ICMPV6_ROUTER_PREF_MEDIUM;
1189 			else if (strcmp(*argv, "high") == 0)
1190 				pref = ICMPV6_ROUTER_PREF_HIGH;
1191 			else if (get_u8(&pref, *argv, 0))
1192 				invarg("\"pref\" value is invalid\n", *argv);
1193 			addattr8(&req.n, sizeof(req), RTA_PREF, pref);
1194 		} else if (strcmp(*argv, "encap") == 0) {
1195 			char buf[1024];
1196 			struct rtattr *rta = (void *)buf;
1197 
1198 			rta->rta_type = RTA_ENCAP;
1199 			rta->rta_len = RTA_LENGTH(0);
1200 
1201 			lwt_parse_encap(rta, sizeof(buf), &argc, &argv);
1202 
1203 			if (rta->rta_len > RTA_LENGTH(0))
1204 				addraw_l(&req.n, 1024, RTA_DATA(rta), RTA_PAYLOAD(rta));
1205 		} else if (strcmp(*argv, "ttl-propagate") == 0) {
1206 			__u8 ttl_prop;
1207 
1208 			NEXT_ARG();
1209 			if (matches(*argv, "enabled") == 0)
1210 				ttl_prop = 1;
1211 			else if (matches(*argv, "disabled") == 0)
1212 				ttl_prop = 0;
1213 			else
1214 				invarg("\"ttl-propagate\" value is invalid\n",
1215 				       *argv);
1216 
1217 			addattr8(&req.n, sizeof(req), RTA_TTL_PROPAGATE,
1218 				 ttl_prop);
1219 		} else {
1220 			int type;
1221 			inet_prefix dst;
1222 
1223 			if (strcmp(*argv, "to") == 0) {
1224 				NEXT_ARG();
1225 			}
1226 			if ((**argv < '0' || **argv > '9') &&
1227 			    rtnl_rtntype_a2n(&type, *argv) == 0) {
1228 				NEXT_ARG();
1229 				req.r.rtm_type = type;
1230 				type_ok = 1;
1231 			}
1232 
1233 			if (matches(*argv, "help") == 0)
1234 				usage();
1235 			if (dst_ok)
1236 				duparg2("to", *argv);
1237 			get_prefix(&dst, *argv, req.r.rtm_family);
1238 			if (req.r.rtm_family == AF_UNSPEC)
1239 				req.r.rtm_family = dst.family;
1240 			req.r.rtm_dst_len = dst.bitlen;
1241 			dst_ok = 1;
1242 			if (dst.bytelen)
1243 				addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
1244 		}
1245 		argc--; argv++;
1246 	}
1247 
1248 	if (!dst_ok)
1249 		usage();
1250 
1251 	if (d) {
1252 		int idx;
1253 
1254 		if ((idx = ll_name_to_index(d)) == 0) {
1255 			fprintf(stderr, "Cannot find device \"%s\"\n", d);
1256 			return -1;
1257 		}
1258 		addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1259 	}
1260 
1261 	if (mxrta->rta_len > RTA_LENGTH(0)) {
1262 		if (mxlock)
1263 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
1264 		addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
1265 	}
1266 
1267 	if (nhs_ok)
1268 		parse_nexthops(&req.n, &req.r, argc, argv);
1269 
1270 	if (req.r.rtm_family == AF_UNSPEC)
1271 		req.r.rtm_family = AF_INET;
1272 
1273 	if (!table_ok) {
1274 		if (req.r.rtm_type == RTN_LOCAL ||
1275 		    req.r.rtm_type == RTN_BROADCAST ||
1276 		    req.r.rtm_type == RTN_NAT ||
1277 		    req.r.rtm_type == RTN_ANYCAST)
1278 			req.r.rtm_table = RT_TABLE_LOCAL;
1279 	}
1280 	if (!scope_ok) {
1281 		if (req.r.rtm_family == AF_INET6 ||
1282 		    req.r.rtm_family == AF_MPLS)
1283 			req.r.rtm_scope = RT_SCOPE_UNIVERSE;
1284 		else if (req.r.rtm_type == RTN_LOCAL ||
1285 			 req.r.rtm_type == RTN_NAT)
1286 			req.r.rtm_scope = RT_SCOPE_HOST;
1287 		else if (req.r.rtm_type == RTN_BROADCAST ||
1288 			 req.r.rtm_type == RTN_MULTICAST ||
1289 			 req.r.rtm_type == RTN_ANYCAST)
1290 			req.r.rtm_scope = RT_SCOPE_LINK;
1291 		else if (req.r.rtm_type == RTN_UNICAST ||
1292 			 req.r.rtm_type == RTN_UNSPEC) {
1293 			if (cmd == RTM_DELROUTE)
1294 				req.r.rtm_scope = RT_SCOPE_NOWHERE;
1295 			else if (!gw_ok && !nhs_ok)
1296 				req.r.rtm_scope = RT_SCOPE_LINK;
1297 		}
1298 	}
1299 
1300 	if (!type_ok && req.r.rtm_family == AF_MPLS)
1301 		req.r.rtm_type = RTN_UNICAST;
1302 
1303 	if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
1304 		return -2;
1305 
1306 	return 0;
1307 }
1308 
rtnl_rtcache_request(struct rtnl_handle * rth,int family)1309 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
1310 {
1311 	struct {
1312 		struct nlmsghdr nlh;
1313 		struct rtmsg rtm;
1314 	} req = {
1315 		.nlh.nlmsg_len = sizeof(req),
1316 		.nlh.nlmsg_type = RTM_GETROUTE,
1317 		.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST,
1318 		.nlh.nlmsg_seq = rth->dump = ++rth->seq,
1319 		.rtm.rtm_family = family,
1320 		.rtm.rtm_flags = RTM_F_CLONED,
1321 	};
1322 	struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
1323 
1324 	return sendto(rth->fd, (void *)&req, sizeof(req), 0, (struct sockaddr *)&nladdr, sizeof(nladdr));
1325 }
1326 
iproute_flush_cache(void)1327 static int iproute_flush_cache(void)
1328 {
1329 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
1330 
1331 	int len;
1332 	int flush_fd = open(ROUTE_FLUSH_PATH, O_WRONLY);
1333 	char *buffer = "-1";
1334 
1335 	if (flush_fd < 0) {
1336 		fprintf(stderr, "Cannot open \"%s\": %s\n",
1337 				ROUTE_FLUSH_PATH, strerror(errno));
1338 		return -1;
1339 	}
1340 
1341 	len = strlen(buffer);
1342 
1343 	if ((write(flush_fd, (void *)buffer, len)) < len) {
1344 		fprintf(stderr, "Cannot flush routing cache\n");
1345 		close(flush_fd);
1346 		return -1;
1347 	}
1348 	close(flush_fd);
1349 	return 0;
1350 }
1351 
1352 static __u32 route_dump_magic = 0x45311224;
1353 
save_route(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)1354 static int save_route(const struct sockaddr_nl *who, struct nlmsghdr *n,
1355 		      void *arg)
1356 {
1357 	int ret;
1358 	int len = n->nlmsg_len;
1359 	struct rtmsg *r = NLMSG_DATA(n);
1360 	struct rtattr *tb[RTA_MAX+1];
1361 	int host_len;
1362 
1363 	host_len = af_bit_len(r->rtm_family);
1364 	len -= NLMSG_LENGTH(sizeof(*r));
1365 	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1366 
1367 	if (!filter_nlmsg(n, tb, host_len))
1368 		return 0;
1369 
1370 	ret = write(STDOUT_FILENO, n, n->nlmsg_len);
1371 	if ((ret > 0) && (ret != n->nlmsg_len)) {
1372 		fprintf(stderr, "Short write while saving nlmsg\n");
1373 		ret = -EIO;
1374 	}
1375 
1376 	return ret == n->nlmsg_len ? 0 : ret;
1377 }
1378 
save_route_prep(void)1379 static int save_route_prep(void)
1380 {
1381 	int ret;
1382 
1383 	if (isatty(STDOUT_FILENO)) {
1384 		fprintf(stderr, "Not sending a binary stream to stdout\n");
1385 		return -1;
1386 	}
1387 
1388 	ret = write(STDOUT_FILENO, &route_dump_magic, sizeof(route_dump_magic));
1389 	if (ret != sizeof(route_dump_magic)) {
1390 		fprintf(stderr, "Can't write magic to dump file\n");
1391 		return -1;
1392 	}
1393 
1394 	return 0;
1395 }
1396 
iproute_list_flush_or_save(int argc,char ** argv,int action)1397 static int iproute_list_flush_or_save(int argc, char **argv, int action)
1398 {
1399 	int do_ipv6 = preferred_family;
1400 	char *id = NULL;
1401 	char *od = NULL;
1402 	unsigned int mark = 0;
1403 	rtnl_filter_t filter_fn;
1404 	int ret;
1405 
1406 	if (action == IPROUTE_SAVE) {
1407 		if (save_route_prep())
1408 			return -1;
1409 
1410 		filter_fn = save_route;
1411 	} else
1412 		filter_fn = print_route;
1413 
1414 	iproute_reset_filter(0);
1415 	filter.tb = RT_TABLE_MAIN;
1416 
1417 	if ((action == IPROUTE_FLUSH) && argc <= 0) {
1418 		fprintf(stderr, "\"ip route flush\" requires arguments.\n");
1419 		return -1;
1420 	}
1421 
1422 	while (argc > 0) {
1423 		if (matches(*argv, "table") == 0) {
1424 			__u32 tid;
1425 
1426 			NEXT_ARG();
1427 			if (rtnl_rttable_a2n(&tid, *argv)) {
1428 				if (strcmp(*argv, "all") == 0) {
1429 					filter.tb = 0;
1430 				} else if (strcmp(*argv, "cache") == 0) {
1431 					filter.cloned = 1;
1432 				} else if (strcmp(*argv, "help") == 0) {
1433 					usage();
1434 				} else {
1435 					invarg("table id value is invalid\n", *argv);
1436 				}
1437 			} else
1438 				filter.tb = tid;
1439 		} else if (matches(*argv, "vrf") == 0) {
1440 			__u32 tid;
1441 
1442 			NEXT_ARG();
1443 			tid = ipvrf_get_table(*argv);
1444 			if (tid == 0)
1445 				invarg("Invalid VRF\n", *argv);
1446 			filter.tb = tid;
1447 			filter.typemask = ~(1 << RTN_LOCAL | 1<<RTN_BROADCAST);
1448 		} else if (matches(*argv, "cached") == 0 ||
1449 			   matches(*argv, "cloned") == 0) {
1450 			filter.cloned = 1;
1451 		} else if (strcmp(*argv, "tos") == 0 ||
1452 			   matches(*argv, "dsfield") == 0) {
1453 			__u32 tos;
1454 
1455 			NEXT_ARG();
1456 			if (rtnl_dsfield_a2n(&tos, *argv))
1457 				invarg("TOS value is invalid\n", *argv);
1458 			filter.tos = tos;
1459 			filter.tosmask = -1;
1460 		} else if (matches(*argv, "protocol") == 0) {
1461 			__u32 prot = 0;
1462 
1463 			NEXT_ARG();
1464 			filter.protocolmask = -1;
1465 			if (rtnl_rtprot_a2n(&prot, *argv)) {
1466 				if (strcmp(*argv, "all") != 0)
1467 					invarg("invalid \"protocol\"\n", *argv);
1468 				prot = 0;
1469 				filter.protocolmask = 0;
1470 			}
1471 			filter.protocol = prot;
1472 		} else if (matches(*argv, "scope") == 0) {
1473 			__u32 scope = 0;
1474 
1475 			NEXT_ARG();
1476 			filter.scopemask = -1;
1477 			if (rtnl_rtscope_a2n(&scope, *argv)) {
1478 				if (strcmp(*argv, "all") != 0)
1479 					invarg("invalid \"scope\"\n", *argv);
1480 				scope = RT_SCOPE_NOWHERE;
1481 				filter.scopemask = 0;
1482 			}
1483 			filter.scope = scope;
1484 		} else if (matches(*argv, "type") == 0) {
1485 			int type;
1486 
1487 			NEXT_ARG();
1488 			if (rtnl_rtntype_a2n(&type, *argv))
1489 				invarg("node type value is invalid\n", *argv);
1490 			filter.typemask = (1<<type);
1491 		} else if (strcmp(*argv, "dev") == 0 ||
1492 			   strcmp(*argv, "oif") == 0) {
1493 			NEXT_ARG();
1494 			od = *argv;
1495 		} else if (strcmp(*argv, "iif") == 0) {
1496 			NEXT_ARG();
1497 			id = *argv;
1498 		} else if (strcmp(*argv, "mark") == 0) {
1499 			NEXT_ARG();
1500 			if (get_unsigned(&mark, *argv, 0))
1501 				invarg("invalid mark value", *argv);
1502 			filter.markmask = -1;
1503 		} else if (strcmp(*argv, "via") == 0) {
1504 			int family;
1505 
1506 			NEXT_ARG();
1507 			family = read_family(*argv);
1508 			if (family == AF_UNSPEC)
1509 				family = do_ipv6;
1510 			else
1511 				NEXT_ARG();
1512 			get_prefix(&filter.rvia, *argv, family);
1513 		} else if (strcmp(*argv, "src") == 0) {
1514 			NEXT_ARG();
1515 			get_prefix(&filter.rprefsrc, *argv, do_ipv6);
1516 		} else if (matches(*argv, "realms") == 0) {
1517 			__u32 realm;
1518 
1519 			NEXT_ARG();
1520 			if (get_rt_realms_or_raw(&realm, *argv))
1521 				invarg("invalid realms\n", *argv);
1522 			filter.realm = realm;
1523 			filter.realmmask = ~0U;
1524 			if ((filter.realm&0xFFFF) == 0 &&
1525 			    (*argv)[strlen(*argv) - 1] == '/')
1526 				filter.realmmask &= ~0xFFFF;
1527 			if ((filter.realm&0xFFFF0000U) == 0 &&
1528 			    (strchr(*argv, '/') == NULL ||
1529 			     (*argv)[0] == '/'))
1530 				filter.realmmask &= ~0xFFFF0000U;
1531 		} else if (matches(*argv, "from") == 0) {
1532 			NEXT_ARG();
1533 			if (matches(*argv, "root") == 0) {
1534 				NEXT_ARG();
1535 				get_prefix(&filter.rsrc, *argv, do_ipv6);
1536 			} else if (matches(*argv, "match") == 0) {
1537 				NEXT_ARG();
1538 				get_prefix(&filter.msrc, *argv, do_ipv6);
1539 			} else {
1540 				if (matches(*argv, "exact") == 0) {
1541 					NEXT_ARG();
1542 				}
1543 				get_prefix(&filter.msrc, *argv, do_ipv6);
1544 				filter.rsrc = filter.msrc;
1545 			}
1546 		} else {
1547 			if (matches(*argv, "to") == 0) {
1548 				NEXT_ARG();
1549 			}
1550 			if (matches(*argv, "root") == 0) {
1551 				NEXT_ARG();
1552 				get_prefix(&filter.rdst, *argv, do_ipv6);
1553 			} else if (matches(*argv, "match") == 0) {
1554 				NEXT_ARG();
1555 				get_prefix(&filter.mdst, *argv, do_ipv6);
1556 			} else {
1557 				if (matches(*argv, "exact") == 0) {
1558 					NEXT_ARG();
1559 				}
1560 				get_prefix(&filter.mdst, *argv, do_ipv6);
1561 				filter.rdst = filter.mdst;
1562 			}
1563 		}
1564 		argc--; argv++;
1565 	}
1566 
1567 	if (do_ipv6 == AF_UNSPEC && filter.tb)
1568 		do_ipv6 = AF_INET;
1569 
1570 	if (id || od)  {
1571 		int idx;
1572 
1573 		if (id) {
1574 			if ((idx = ll_name_to_index(id)) == 0) {
1575 				fprintf(stderr, "Cannot find device \"%s\"\n", id);
1576 				return -1;
1577 			}
1578 			filter.iif = idx;
1579 			filter.iifmask = -1;
1580 		}
1581 		if (od) {
1582 			if ((idx = ll_name_to_index(od)) == 0) {
1583 				fprintf(stderr, "Cannot find device \"%s\"\n", od);
1584 				return -1;
1585 			}
1586 			filter.oif = idx;
1587 			filter.oifmask = -1;
1588 		}
1589 	}
1590 	filter.mark = mark;
1591 
1592 	if (action == IPROUTE_FLUSH) {
1593 		int round = 0;
1594 		char flushb[4096-512];
1595 		time_t start = time(0);
1596 
1597 		if (filter.cloned) {
1598 			if (do_ipv6 != AF_INET6) {
1599 				iproute_flush_cache();
1600 				if (show_stats)
1601 					printf("*** IPv4 routing cache is flushed.\n");
1602 			}
1603 			if (do_ipv6 == AF_INET)
1604 				return 0;
1605 		}
1606 
1607 		filter.flushb = flushb;
1608 		filter.flushp = 0;
1609 		filter.flushe = sizeof(flushb);
1610 
1611 		for (;;) {
1612 			if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1613 				perror("Cannot send dump request");
1614 				return -2;
1615 			}
1616 			filter.flushed = 0;
1617 			if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1618 				fprintf(stderr, "Flush terminated\n");
1619 				return -2;
1620 			}
1621 			if (filter.flushed == 0) {
1622 				if (show_stats) {
1623 					if (round == 0 && (!filter.cloned || do_ipv6 == AF_INET6))
1624 						printf("Nothing to flush.\n");
1625 					else
1626 						printf("*** Flush is complete after %d round%s ***\n", round, round > 1?"s":"");
1627 				}
1628 				fflush(stdout);
1629 				return 0;
1630 			}
1631 			round++;
1632 			if ((ret = flush_update()) < 0)
1633 				return ret;
1634 
1635 			if (time(0) - start > 30) {
1636 				printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
1637 				       (long)(time(0) - start), filter.flushed);
1638 				return -1;
1639 			}
1640 
1641 			if (show_stats) {
1642 				printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
1643 				fflush(stdout);
1644 			}
1645 		}
1646 	}
1647 
1648 	if (!filter.cloned) {
1649 		if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1650 			perror("Cannot send dump request");
1651 			return -2;
1652 		}
1653 	} else {
1654 		if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
1655 			perror("Cannot send dump request");
1656 			return -2;
1657 		}
1658 	}
1659 
1660 	if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1661 		fprintf(stderr, "Dump terminated\n");
1662 		return -2;
1663 	}
1664 
1665 	return 0;
1666 }
1667 
1668 
iproute_get(int argc,char ** argv)1669 static int iproute_get(int argc, char **argv)
1670 {
1671 	struct {
1672 		struct nlmsghdr	n;
1673 		struct rtmsg		r;
1674 		char			buf[1024];
1675 	} req = {
1676 		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
1677 		.n.nlmsg_flags = NLM_F_REQUEST,
1678 		.n.nlmsg_type = RTM_GETROUTE,
1679 		.r.rtm_family = preferred_family,
1680 	};
1681 	char  *idev = NULL;
1682 	char  *odev = NULL;
1683 	int connected = 0;
1684 	int fib_match = 0;
1685 	int from_ok = 0;
1686 	unsigned int mark = 0;
1687 
1688 	iproute_reset_filter(0);
1689 	filter.cloned = 2;
1690 
1691 	while (argc > 0) {
1692 		if (strcmp(*argv, "tos") == 0 ||
1693 		    matches(*argv, "dsfield") == 0) {
1694 			__u32 tos;
1695 
1696 			NEXT_ARG();
1697 			if (rtnl_dsfield_a2n(&tos, *argv))
1698 				invarg("TOS value is invalid\n", *argv);
1699 			req.r.rtm_tos = tos;
1700 		} else if (matches(*argv, "from") == 0) {
1701 			inet_prefix addr;
1702 
1703 			NEXT_ARG();
1704 			if (matches(*argv, "help") == 0)
1705 				usage();
1706 			from_ok = 1;
1707 			get_prefix(&addr, *argv, req.r.rtm_family);
1708 			if (req.r.rtm_family == AF_UNSPEC)
1709 				req.r.rtm_family = addr.family;
1710 			if (addr.bytelen)
1711 				addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
1712 			req.r.rtm_src_len = addr.bitlen;
1713 		} else if (matches(*argv, "iif") == 0) {
1714 			NEXT_ARG();
1715 			idev = *argv;
1716 		} else if (matches(*argv, "mark") == 0) {
1717 			NEXT_ARG();
1718 			if (get_unsigned(&mark, *argv, 0))
1719 				invarg("invalid mark value", *argv);
1720 		} else if (matches(*argv, "oif") == 0 ||
1721 			   strcmp(*argv, "dev") == 0) {
1722 			NEXT_ARG();
1723 			odev = *argv;
1724 		} else if (matches(*argv, "notify") == 0) {
1725 			req.r.rtm_flags |= RTM_F_NOTIFY;
1726 		} else if (matches(*argv, "connected") == 0) {
1727 			connected = 1;
1728 		} else if (matches(*argv, "vrf") == 0) {
1729 			NEXT_ARG();
1730 			if (!name_is_vrf(*argv))
1731 				invarg("Invalid VRF\n", *argv);
1732 			odev = *argv;
1733 		} else if (matches(*argv, "uid") == 0) {
1734 			uid_t uid;
1735 
1736 			NEXT_ARG();
1737 			if (get_unsigned(&uid, *argv, 0))
1738 				invarg("invalid UID\n", *argv);
1739 			addattr32(&req.n, sizeof(req), RTA_UID, uid);
1740 		} else if (matches(*argv, "fibmatch") == 0) {
1741 			fib_match = 1;
1742 		} else if (strcmp(*argv, "as") == 0) {
1743 			inet_prefix addr;
1744 
1745 			NEXT_ARG();
1746 			if (strcmp(*argv, "to") == 0)
1747 				NEXT_ARG();
1748 			get_addr(&addr, *argv, req.r.rtm_family);
1749 			if (req.r.rtm_family == AF_UNSPEC)
1750 				req.r.rtm_family = addr.family;
1751 			addattr_l(&req.n, sizeof(req), RTA_NEWDST, &addr.data, addr.bytelen);
1752 		} else {
1753 			inet_prefix addr;
1754 
1755 			if (strcmp(*argv, "to") == 0) {
1756 				NEXT_ARG();
1757 			}
1758 			if (matches(*argv, "help") == 0)
1759 				usage();
1760 			get_prefix(&addr, *argv, req.r.rtm_family);
1761 			if (req.r.rtm_family == AF_UNSPEC)
1762 				req.r.rtm_family = addr.family;
1763 			if (addr.bytelen)
1764 				addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
1765 			req.r.rtm_dst_len = addr.bitlen;
1766 		}
1767 		argc--; argv++;
1768 	}
1769 
1770 	if (req.r.rtm_dst_len == 0) {
1771 		fprintf(stderr, "need at least a destination address\n");
1772 		return -1;
1773 	}
1774 
1775 	if (idev || odev)  {
1776 		int idx;
1777 
1778 		if (idev) {
1779 			if ((idx = ll_name_to_index(idev)) == 0) {
1780 				fprintf(stderr, "Cannot find device \"%s\"\n", idev);
1781 				return -1;
1782 			}
1783 			addattr32(&req.n, sizeof(req), RTA_IIF, idx);
1784 		}
1785 		if (odev) {
1786 			if ((idx = ll_name_to_index(odev)) == 0) {
1787 				fprintf(stderr, "Cannot find device \"%s\"\n", odev);
1788 				return -1;
1789 			}
1790 			addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1791 		}
1792 	}
1793 	if (mark)
1794 		addattr32(&req.n, sizeof(req), RTA_MARK, mark);
1795 
1796 	if (req.r.rtm_family == AF_UNSPEC)
1797 		req.r.rtm_family = AF_INET;
1798 
1799 	req.r.rtm_flags |= RTM_F_LOOKUP_TABLE;
1800 	if (fib_match)
1801 		req.r.rtm_flags |= RTM_F_FIB_MATCH;
1802 
1803 	if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0)
1804 		return -2;
1805 
1806 	if (connected && !from_ok) {
1807 		struct rtmsg *r = NLMSG_DATA(&req.n);
1808 		int len = req.n.nlmsg_len;
1809 		struct rtattr *tb[RTA_MAX+1];
1810 
1811 		if (print_route(NULL, &req.n, (void *)stdout) < 0) {
1812 			fprintf(stderr, "An error :-)\n");
1813 			return -1;
1814 		}
1815 
1816 		if (req.n.nlmsg_type != RTM_NEWROUTE) {
1817 			fprintf(stderr, "Not a route?\n");
1818 			return -1;
1819 		}
1820 		len -= NLMSG_LENGTH(sizeof(*r));
1821 		if (len < 0) {
1822 			fprintf(stderr, "Wrong len %d\n", len);
1823 			return -1;
1824 		}
1825 
1826 		parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1827 
1828 		if (tb[RTA_PREFSRC]) {
1829 			tb[RTA_PREFSRC]->rta_type = RTA_SRC;
1830 			r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
1831 		} else if (!tb[RTA_SRC]) {
1832 			fprintf(stderr, "Failed to connect the route\n");
1833 			return -1;
1834 		}
1835 		if (!odev && tb[RTA_OIF])
1836 			tb[RTA_OIF]->rta_type = 0;
1837 		if (tb[RTA_GATEWAY])
1838 			tb[RTA_GATEWAY]->rta_type = 0;
1839 		if (tb[RTA_VIA])
1840 			tb[RTA_VIA]->rta_type = 0;
1841 		if (!idev && tb[RTA_IIF])
1842 			tb[RTA_IIF]->rta_type = 0;
1843 		req.n.nlmsg_flags = NLM_F_REQUEST;
1844 		req.n.nlmsg_type = RTM_GETROUTE;
1845 
1846 		if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0)
1847 			return -2;
1848 	}
1849 
1850 	if (print_route(NULL, &req.n, (void *)stdout) < 0) {
1851 		fprintf(stderr, "An error :-)\n");
1852 		return -1;
1853 	}
1854 
1855 	return 0;
1856 }
1857 
rtattr_cmp(const struct rtattr * rta1,const struct rtattr * rta2)1858 static int rtattr_cmp(const struct rtattr *rta1, const struct rtattr *rta2)
1859 {
1860 	if (!rta1 || !rta2 || rta1->rta_len != rta2->rta_len)
1861 		return 1;
1862 
1863 	return memcmp(RTA_DATA(rta1), RTA_DATA(rta2), RTA_PAYLOAD(rta1));
1864 }
1865 
restore_handler(const struct sockaddr_nl * nl,struct rtnl_ctrl_data * ctrl,struct nlmsghdr * n,void * arg)1866 static int restore_handler(const struct sockaddr_nl *nl,
1867 			   struct rtnl_ctrl_data *ctrl,
1868 			   struct nlmsghdr *n, void *arg)
1869 {
1870 	struct rtmsg *r = NLMSG_DATA(n);
1871 	struct rtattr *tb[RTA_MAX+1];
1872 	int len = n->nlmsg_len - NLMSG_LENGTH(sizeof(*r));
1873 	int ret, prio = *(int *)arg;
1874 
1875 	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1876 
1877 	/* Restore routes in correct order:
1878 	 * 0. ones for local addresses,
1879 	 * 1. ones for local networks,
1880 	 * 2. others (remote networks/hosts).
1881 	 */
1882 	if (!prio && !tb[RTA_GATEWAY] && (!tb[RTA_PREFSRC] ||
1883 	    !rtattr_cmp(tb[RTA_PREFSRC], tb[RTA_DST])))
1884 		goto restore;
1885 	else if (prio == 1 && !tb[RTA_GATEWAY] && tb[RTA_PREFSRC] &&
1886 		 rtattr_cmp(tb[RTA_PREFSRC], tb[RTA_DST]))
1887 		goto restore;
1888 	else if (prio == 2 && tb[RTA_GATEWAY])
1889 		goto restore;
1890 
1891 	return 0;
1892 
1893 restore:
1894 	n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
1895 
1896 	ll_init_map(&rth);
1897 
1898 	ret = rtnl_talk(&rth, n, n, sizeof(*n));
1899 	if ((ret < 0) && (errno == EEXIST))
1900 		ret = 0;
1901 
1902 	return ret;
1903 }
1904 
route_dump_check_magic(void)1905 static int route_dump_check_magic(void)
1906 {
1907 	int ret;
1908 	__u32 magic = 0;
1909 
1910 	if (isatty(STDIN_FILENO)) {
1911 		fprintf(stderr, "Can't restore route dump from a terminal\n");
1912 		return -1;
1913 	}
1914 
1915 	ret = fread(&magic, sizeof(magic), 1, stdin);
1916 	if (magic != route_dump_magic) {
1917 		fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n", ret, magic);
1918 		return -1;
1919 	}
1920 
1921 	return 0;
1922 }
1923 
iproute_restore(void)1924 static int iproute_restore(void)
1925 {
1926 	int pos, prio;
1927 
1928 	if (route_dump_check_magic())
1929 		return -1;
1930 
1931 	pos = ftell(stdin);
1932 	if (pos == -1) {
1933 		perror("Failed to restore: ftell");
1934 		return -1;
1935 	}
1936 
1937 	for (prio = 0; prio < 3; prio++) {
1938 		int err;
1939 
1940 		err = rtnl_from_file(stdin, &restore_handler, &prio);
1941 		if (err)
1942 			return -2;
1943 
1944 		if (fseek(stdin, pos, SEEK_SET) == -1) {
1945 			perror("Failed to restore: fseek");
1946 			return -1;
1947 		}
1948 	}
1949 
1950 	return 0;
1951 }
1952 
show_handler(const struct sockaddr_nl * nl,struct rtnl_ctrl_data * ctrl,struct nlmsghdr * n,void * arg)1953 static int show_handler(const struct sockaddr_nl *nl,
1954 			struct rtnl_ctrl_data *ctrl,
1955 			struct nlmsghdr *n, void *arg)
1956 {
1957 	print_route(nl, n, stdout);
1958 	return 0;
1959 }
1960 
iproute_showdump(void)1961 static int iproute_showdump(void)
1962 {
1963 	if (route_dump_check_magic())
1964 		return -1;
1965 
1966 	if (rtnl_from_file(stdin, &show_handler, NULL))
1967 		return -2;
1968 
1969 	return 0;
1970 }
1971 
iproute_reset_filter(int ifindex)1972 void iproute_reset_filter(int ifindex)
1973 {
1974 	memset(&filter, 0, sizeof(filter));
1975 	filter.mdst.bitlen = -1;
1976 	filter.msrc.bitlen = -1;
1977 	filter.oif = ifindex;
1978 	if (filter.oif > 0)
1979 		filter.oifmask = -1;
1980 }
1981 
do_iproute(int argc,char ** argv)1982 int do_iproute(int argc, char **argv)
1983 {
1984 	if (argc < 1)
1985 		return iproute_list_flush_or_save(0, NULL, IPROUTE_LIST);
1986 
1987 	if (matches(*argv, "add") == 0)
1988 		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
1989 				      argc-1, argv+1);
1990 	if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
1991 		return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
1992 				      argc-1, argv+1);
1993 	if (matches(*argv, "replace") == 0)
1994 		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
1995 				      argc-1, argv+1);
1996 	if (matches(*argv, "prepend") == 0)
1997 		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
1998 				      argc-1, argv+1);
1999 	if (matches(*argv, "append") == 0)
2000 		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
2001 				      argc-1, argv+1);
2002 	if (matches(*argv, "test") == 0)
2003 		return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
2004 				      argc-1, argv+1);
2005 	if (matches(*argv, "delete") == 0)
2006 		return iproute_modify(RTM_DELROUTE, 0,
2007 				      argc-1, argv+1);
2008 	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
2009 	    || matches(*argv, "lst") == 0)
2010 		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_LIST);
2011 	if (matches(*argv, "get") == 0)
2012 		return iproute_get(argc-1, argv+1);
2013 	if (matches(*argv, "flush") == 0)
2014 		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_FLUSH);
2015 	if (matches(*argv, "save") == 0)
2016 		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_SAVE);
2017 	if (matches(*argv, "restore") == 0)
2018 		return iproute_restore();
2019 	if (matches(*argv, "showdump") == 0)
2020 		return iproute_showdump();
2021 	if (matches(*argv, "help") == 0)
2022 		usage();
2023 	fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
2024 	exit(-1);
2025 }
2026