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 ADDRESS [ from ADDRESS iif STRING ]\n");
69 	fprintf(stderr, "                            [ oif STRING ] [ tos TOS ]\n");
70 	fprintf(stderr, "                            [ mark NUMBER ] [ uid NUMBER ]\n");
71 	fprintf(stderr, "       ip route { add | del | change | append | replace } ROUTE\n");
72 	fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
73 	fprintf(stderr, "            [ table TABLE_ID ] [ proto RTPROTO ]\n");
74 	fprintf(stderr, "            [ type TYPE ] [ scope SCOPE ]\n");
75 	fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
76 	fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
77 	fprintf(stderr, "             [ table TABLE_ID ] [ proto RTPROTO ]\n");
78 	fprintf(stderr, "             [ scope SCOPE ] [ metric METRIC ]\n");
79 	fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
80 	fprintf(stderr, "NH := [ encap ENCAPTYPE ENCAPHDR ] [ via [ FAMILY ] ADDRESS ]\n");
81 	fprintf(stderr, "	    [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
82 	fprintf(stderr, "FAMILY := [ inet | inet6 | ipx | dnet | mpls | bridge | link ]\n");
83 	fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ] [ as [ to ] ADDRESS ]\n");
84 	fprintf(stderr, "           [ rtt TIME ] [ rttvar TIME ] [ reordering NUMBER ]\n");
85 	fprintf(stderr, "           [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
86 	fprintf(stderr, "           [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
87 	fprintf(stderr, "           [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n");
88 	fprintf(stderr, "           [ features FEATURES ] [ quickack BOOL ] [ congctl NAME ]\n");
89 	fprintf(stderr, "           [ pref PREF ] [ expires TIME ]\n");
90 	fprintf(stderr, "TYPE := [ unicast | local | broadcast | multicast | throw |\n");
91 	fprintf(stderr, "          unreachable | prohibit | blackhole | nat ]\n");
92 	fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
93 	fprintf(stderr, "SCOPE := [ host | link | global | NUMBER ]\n");
94 	fprintf(stderr, "NHFLAGS := [ onlink | pervasive ]\n");
95 	fprintf(stderr, "RTPROTO := [ kernel | boot | static | NUMBER ]\n");
96 	fprintf(stderr, "PREF := [ low | medium | high ]\n");
97 	fprintf(stderr, "TIME := NUMBER[s|ms]\n");
98 	fprintf(stderr, "BOOL := [1|0]\n");
99 	fprintf(stderr, "FEATURES := ecn\n");
100 	fprintf(stderr, "ENCAPTYPE := [ mpls | ip | ip6 ]\n");
101 	fprintf(stderr, "ENCAPHDR := [ MPLSLABEL ]\n");
102 	exit(-1);
103 }
104 
105 
106 static struct
107 {
108 	unsigned int tb;
109 	int cloned;
110 	int flushed;
111 	char *flushb;
112 	int flushp;
113 	int flushe;
114 	int protocol, protocolmask;
115 	int scope, scopemask;
116 	int type, typemask;
117 	int tos, tosmask;
118 	int iif, iifmask;
119 	int oif, oifmask;
120 	int mark, markmask;
121 	int realm, realmmask;
122 	inet_prefix rprefsrc;
123 	inet_prefix rvia;
124 	inet_prefix rdst;
125 	inet_prefix mdst;
126 	inet_prefix rsrc;
127 	inet_prefix msrc;
128 } filter;
129 
flush_update(void)130 static int flush_update(void)
131 {
132 	if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
133 		perror("Failed to send flush request");
134 		return -1;
135 	}
136 	filter.flushp = 0;
137 	return 0;
138 }
139 
filter_nlmsg(struct nlmsghdr * n,struct rtattr ** tb,int host_len)140 static int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
141 {
142 	struct rtmsg *r = NLMSG_DATA(n);
143 	inet_prefix dst;
144 	inet_prefix src;
145 	inet_prefix via;
146 	inet_prefix prefsrc;
147 	__u32 table;
148 	static int ip6_multiple_tables;
149 
150 	table = rtm_get_table(r, tb);
151 
152 	if (preferred_family != AF_UNSPEC && r->rtm_family != preferred_family)
153 		return 0;
154 
155 	if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
156 		ip6_multiple_tables = 1;
157 
158 	if (filter.cloned == !(r->rtm_flags&RTM_F_CLONED))
159 		return 0;
160 
161 	if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
162 		if (filter.tb) {
163 			if (filter.tb == RT_TABLE_LOCAL) {
164 				if (r->rtm_type != RTN_LOCAL)
165 					return 0;
166 			} else if (filter.tb == RT_TABLE_MAIN) {
167 				if (r->rtm_type == RTN_LOCAL)
168 					return 0;
169 			} else {
170 				return 0;
171 			}
172 		}
173 	} else {
174 		if (filter.tb > 0 && filter.tb != table)
175 			return 0;
176 	}
177 	if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
178 		return 0;
179 	if ((filter.scope^r->rtm_scope)&filter.scopemask)
180 		return 0;
181 	if ((filter.type^r->rtm_type)&filter.typemask)
182 		return 0;
183 	if ((filter.tos^r->rtm_tos)&filter.tosmask)
184 		return 0;
185 	if (filter.rdst.family &&
186 	    (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len))
187 		return 0;
188 	if (filter.mdst.family &&
189 	    (r->rtm_family != filter.mdst.family ||
190 	     (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len)))
191 		return 0;
192 	if (filter.rsrc.family &&
193 	    (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len))
194 		return 0;
195 	if (filter.msrc.family &&
196 	    (r->rtm_family != filter.msrc.family ||
197 	     (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len)))
198 		return 0;
199 	if (filter.rvia.family) {
200 		int family = r->rtm_family;
201 		if (tb[RTA_VIA]) {
202 			struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
203 			family = via->rtvia_family;
204 		}
205 		if (family != filter.rvia.family)
206 			return 0;
207 	}
208 	if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
209 		return 0;
210 
211 	memset(&dst, 0, sizeof(dst));
212 	dst.family = r->rtm_family;
213 	if (tb[RTA_DST])
214 		memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
215 	if (filter.rsrc.family || filter.msrc.family) {
216 		memset(&src, 0, sizeof(src));
217 		src.family = r->rtm_family;
218 		if (tb[RTA_SRC])
219 			memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
220 	}
221 	if (filter.rvia.bitlen>0) {
222 		memset(&via, 0, sizeof(via));
223 		via.family = r->rtm_family;
224 		if (tb[RTA_GATEWAY])
225 			memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
226 		if (tb[RTA_VIA]) {
227 			size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
228 			struct rtvia *rtvia = RTA_DATA(tb[RTA_VIA]);
229 			via.family = rtvia->rtvia_family;
230 			memcpy(&via.data, rtvia->rtvia_addr, len);
231 		}
232 	}
233 	if (filter.rprefsrc.bitlen>0) {
234 		memset(&prefsrc, 0, sizeof(prefsrc));
235 		prefsrc.family = r->rtm_family;
236 		if (tb[RTA_PREFSRC])
237 			memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
238 	}
239 
240 	if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
241 		return 0;
242 	if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
243 	    inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
244 		return 0;
245 
246 	if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
247 		return 0;
248 	if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
249 	    inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
250 		return 0;
251 
252 	if (filter.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
253 		return 0;
254 	if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
255 		return 0;
256 	if (filter.realmmask) {
257 		__u32 realms = 0;
258 		if (tb[RTA_FLOW])
259 			realms = rta_getattr_u32(tb[RTA_FLOW]);
260 		if ((realms^filter.realm)&filter.realmmask)
261 			return 0;
262 	}
263 	if (filter.iifmask) {
264 		int iif = 0;
265 		if (tb[RTA_IIF])
266 			iif = *(int*)RTA_DATA(tb[RTA_IIF]);
267 		if ((iif^filter.iif)&filter.iifmask)
268 			return 0;
269 	}
270 	if (filter.oifmask) {
271 		int oif = 0;
272 		if (tb[RTA_OIF])
273 			oif = *(int*)RTA_DATA(tb[RTA_OIF]);
274 		if ((oif^filter.oif)&filter.oifmask)
275 			return 0;
276 	}
277 	if (filter.markmask) {
278 		int mark = 0;
279 		if (tb[RTA_MARK])
280 			mark = *(int *)RTA_DATA(tb[RTA_MARK]);
281 		if ((mark ^ filter.mark) & filter.markmask)
282 			return 0;
283 	}
284 	if (filter.flushb &&
285 	    r->rtm_family == AF_INET6 &&
286 	    r->rtm_dst_len == 0 &&
287 	    r->rtm_type == RTN_UNREACHABLE &&
288 	    tb[RTA_PRIORITY] &&
289 	    *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
290 		return 0;
291 
292 	return 1;
293 }
294 
print_rtax_features(FILE * fp,unsigned int features)295 static void print_rtax_features(FILE *fp, unsigned int features)
296 {
297 	unsigned int of = features;
298 
299 	if (features & RTAX_FEATURE_ECN) {
300 		fprintf(fp, " ecn");
301 		features &= ~RTAX_FEATURE_ECN;
302 	}
303 
304 	if (features)
305 		fprintf(fp, " 0x%x", of);
306 }
307 
print_route(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)308 int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
309 {
310 	FILE *fp = (FILE*)arg;
311 	struct rtmsg *r = NLMSG_DATA(n);
312 	int len = n->nlmsg_len;
313 	struct rtattr * tb[RTA_MAX+1];
314 	char abuf[256];
315 	int host_len;
316 	__u32 table;
317 	SPRINT_BUF(b1);
318 	static int hz;
319 
320 	if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
321 		fprintf(stderr, "Not a route: %08x %08x %08x\n",
322 			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
323 		return 0;
324 	}
325 	if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
326 		return 0;
327 	len -= NLMSG_LENGTH(sizeof(*r));
328 	if (len < 0) {
329 		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
330 		return -1;
331 	}
332 
333 	host_len = af_bit_len(r->rtm_family);
334 
335 	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
336 	table = rtm_get_table(r, tb);
337 
338 	if (!filter_nlmsg(n, tb, host_len))
339 		return 0;
340 
341 	if (filter.flushb) {
342 		struct nlmsghdr *fn;
343 		if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
344 			if (flush_update())
345 				return -1;
346 		}
347 		fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
348 		memcpy(fn, n, n->nlmsg_len);
349 		fn->nlmsg_type = RTM_DELROUTE;
350 		fn->nlmsg_flags = NLM_F_REQUEST;
351 		fn->nlmsg_seq = ++rth.seq;
352 		filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
353 		filter.flushed++;
354 		if (show_stats < 2)
355 			return 0;
356 	}
357 
358 	if (n->nlmsg_type == RTM_DELROUTE)
359 		fprintf(fp, "Deleted ");
360 	if ((r->rtm_type != RTN_UNICAST || show_details > 0) && !filter.type)
361 		fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
362 
363 	if (tb[RTA_DST]) {
364 		if (r->rtm_dst_len != host_len) {
365 			fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
366 						       RTA_PAYLOAD(tb[RTA_DST]),
367 						       RTA_DATA(tb[RTA_DST]),
368 						       abuf, sizeof(abuf)),
369 				r->rtm_dst_len
370 				);
371 		} else {
372 			fprintf(fp, "%s ", format_host(r->rtm_family,
373 						       RTA_PAYLOAD(tb[RTA_DST]),
374 						       RTA_DATA(tb[RTA_DST]),
375 						       abuf, sizeof(abuf))
376 				);
377 		}
378 	} else if (r->rtm_dst_len) {
379 		fprintf(fp, "0/%d ", r->rtm_dst_len);
380 	} else {
381 		fprintf(fp, "default ");
382 	}
383 	if (tb[RTA_SRC]) {
384 		if (r->rtm_src_len != host_len) {
385 			fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
386 						       RTA_PAYLOAD(tb[RTA_SRC]),
387 						       RTA_DATA(tb[RTA_SRC]),
388 						       abuf, sizeof(abuf)),
389 				r->rtm_src_len
390 				);
391 		} else {
392 			fprintf(fp, "from %s ", format_host(r->rtm_family,
393 						       RTA_PAYLOAD(tb[RTA_SRC]),
394 						       RTA_DATA(tb[RTA_SRC]),
395 						       abuf, sizeof(abuf))
396 				);
397 		}
398 	} else if (r->rtm_src_len) {
399 		fprintf(fp, "from 0/%u ", r->rtm_src_len);
400 	}
401 	if (tb[RTA_NEWDST]) {
402 		fprintf(fp, "as to %s ", format_host(r->rtm_family,
403 						  RTA_PAYLOAD(tb[RTA_NEWDST]),
404 						  RTA_DATA(tb[RTA_NEWDST]),
405 						  abuf, sizeof(abuf))
406 			);
407 	}
408 
409 	if (tb[RTA_ENCAP])
410 		lwt_print_encap(fp, tb[RTA_ENCAP_TYPE], tb[RTA_ENCAP]);
411 
412 	if (r->rtm_tos && filter.tosmask != -1) {
413 		SPRINT_BUF(b1);
414 		fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
415 	}
416 
417 	if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
418 		fprintf(fp, "via %s ",
419 			format_host(r->rtm_family,
420 				    RTA_PAYLOAD(tb[RTA_GATEWAY]),
421 				    RTA_DATA(tb[RTA_GATEWAY]),
422 				    abuf, sizeof(abuf)));
423 	}
424 	if (tb[RTA_VIA]) {
425 		size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
426 		struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
427 		fprintf(fp, "via %s %s ",
428 			family_name(via->rtvia_family),
429 			format_host(via->rtvia_family, len, via->rtvia_addr,
430 				    abuf, sizeof(abuf)));
431 	}
432 	if (tb[RTA_OIF] && filter.oifmask != -1)
433 		fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
434 
435 	if (table && (table != RT_TABLE_MAIN || show_details > 0) && !filter.tb)
436 		fprintf(fp, " table %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
437 	if (!(r->rtm_flags&RTM_F_CLONED)) {
438 		if ((r->rtm_protocol != RTPROT_BOOT || show_details > 0) && filter.protocolmask != -1)
439 			fprintf(fp, " proto %s ", rtnl_rtprot_n2a(r->rtm_protocol, b1, sizeof(b1)));
440 		if ((r->rtm_scope != RT_SCOPE_UNIVERSE || show_details > 0) && filter.scopemask != -1)
441 			fprintf(fp, " scope %s ", rtnl_rtscope_n2a(r->rtm_scope, b1, sizeof(b1)));
442 	}
443 	if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
444 		/* Do not use format_host(). It is our local addr
445 		   and symbolic name will not be useful.
446 		 */
447 		fprintf(fp, " src %s ",
448 			rt_addr_n2a(r->rtm_family,
449 				    RTA_PAYLOAD(tb[RTA_PREFSRC]),
450 				    RTA_DATA(tb[RTA_PREFSRC]),
451 				    abuf, sizeof(abuf)));
452 	}
453 	if (tb[RTA_PRIORITY])
454 		fprintf(fp, " metric %u ", rta_getattr_u32(tb[RTA_PRIORITY]));
455 	if (r->rtm_flags & RTNH_F_DEAD)
456 		fprintf(fp, "dead ");
457 	if (r->rtm_flags & RTNH_F_ONLINK)
458 		fprintf(fp, "onlink ");
459 	if (r->rtm_flags & RTNH_F_PERVASIVE)
460 		fprintf(fp, "pervasive ");
461 	if (r->rtm_flags & RTNH_F_OFFLOAD)
462 		fprintf(fp, "offload ");
463 	if (r->rtm_flags & RTM_F_NOTIFY)
464 		fprintf(fp, "notify ");
465 	if (r->rtm_flags & RTNH_F_LINKDOWN)
466 		fprintf(fp, "linkdown ");
467 	if (tb[RTA_MARK]) {
468 		unsigned int mark = *(unsigned int*)RTA_DATA(tb[RTA_MARK]);
469 		if (mark) {
470 			if (mark >= 16)
471 				fprintf(fp, " mark 0x%x", mark);
472 			else
473 				fprintf(fp, " mark %u", mark);
474 		}
475 	}
476 
477 	if (tb[RTA_FLOW] && filter.realmmask != ~0U) {
478 		__u32 to = rta_getattr_u32(tb[RTA_FLOW]);
479 		__u32 from = to>>16;
480 		to &= 0xFFFF;
481 		fprintf(fp, "realm%s ", from ? "s" : "");
482 		if (from) {
483 			fprintf(fp, "%s/",
484 				rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
485 		}
486 		fprintf(fp, "%s ",
487 			rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
488 	}
489 
490 	if (tb[RTA_UID])
491 		fprintf(fp, "uid %u ", rta_getattr_u32(tb[RTA_UID]));
492 
493 	if ((r->rtm_flags&RTM_F_CLONED) && r->rtm_family == AF_INET) {
494 		__u32 flags = r->rtm_flags&~0xFFFF;
495 		int first = 1;
496 
497 		fprintf(fp, "%s    cache ", _SL_);
498 
499 #define PRTFL(fl,flname) if (flags&RTCF_##fl) { \
500   flags &= ~RTCF_##fl; \
501   fprintf(fp, "%s" flname "%s", first ? "<" : "", flags ? "," : "> "); \
502   first = 0; }
503 		PRTFL(LOCAL, "local");
504 		PRTFL(REJECT, "reject");
505 		PRTFL(MULTICAST, "mc");
506 		PRTFL(BROADCAST, "brd");
507 		PRTFL(DNAT, "dst-nat");
508 		PRTFL(SNAT, "src-nat");
509 		PRTFL(MASQ, "masq");
510 		PRTFL(DIRECTDST, "dst-direct");
511 		PRTFL(DIRECTSRC, "src-direct");
512 		PRTFL(REDIRECTED, "redirected");
513 		PRTFL(DOREDIRECT, "redirect");
514 		PRTFL(FAST, "fastroute");
515 		PRTFL(NOTIFY, "notify");
516 		PRTFL(TPROXY, "proxy");
517 
518 		if (flags)
519 			fprintf(fp, "%s%x> ", first ? "<" : "", flags);
520 		if (tb[RTA_CACHEINFO]) {
521 			struct rta_cacheinfo *ci = RTA_DATA(tb[RTA_CACHEINFO]);
522 			if (!hz)
523 				hz = get_user_hz();
524 			if (ci->rta_expires != 0)
525 				fprintf(fp, " expires %dsec", ci->rta_expires/hz);
526 			if (ci->rta_error != 0)
527 				fprintf(fp, " error %d", ci->rta_error);
528 			if (show_stats) {
529 				if (ci->rta_clntref)
530 					fprintf(fp, " users %d", ci->rta_clntref);
531 				if (ci->rta_used != 0)
532 					fprintf(fp, " used %d", ci->rta_used);
533 				if (ci->rta_lastuse != 0)
534 					fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
535 			}
536 			if (ci->rta_id)
537 				fprintf(fp, " ipid 0x%04x", ci->rta_id);
538 			if (ci->rta_ts || ci->rta_tsage)
539 				fprintf(fp, " ts 0x%x tsage %dsec",
540 					ci->rta_ts, ci->rta_tsage);
541 		}
542 	} else if (r->rtm_family == AF_INET6) {
543 		struct rta_cacheinfo *ci = NULL;
544 		if (tb[RTA_CACHEINFO])
545 			ci = RTA_DATA(tb[RTA_CACHEINFO]);
546 		if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
547 			if (!hz)
548 				hz = get_user_hz();
549 			if (r->rtm_flags & RTM_F_CLONED)
550 				fprintf(fp, "%s    cache ", _SL_);
551 			if (ci->rta_expires)
552 				fprintf(fp, " expires %dsec", ci->rta_expires/hz);
553 			if (ci->rta_error != 0)
554 				fprintf(fp, " error %d", ci->rta_error);
555 			if (show_stats) {
556 				if (ci->rta_clntref)
557 					fprintf(fp, " users %d", ci->rta_clntref);
558 				if (ci->rta_used != 0)
559 					fprintf(fp, " used %d", ci->rta_used);
560 				if (ci->rta_lastuse != 0)
561 					fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
562 			}
563 		} else if (ci) {
564 			if (ci->rta_error != 0)
565 				fprintf(fp, " error %d", ci->rta_error);
566 		}
567 	}
568 	if (tb[RTA_METRICS]) {
569 		int i;
570 		unsigned mxlock = 0;
571 		struct rtattr *mxrta[RTAX_MAX+1];
572 
573 		parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(tb[RTA_METRICS]),
574 			    RTA_PAYLOAD(tb[RTA_METRICS]));
575 		if (mxrta[RTAX_LOCK])
576 			mxlock = *(unsigned*)RTA_DATA(mxrta[RTAX_LOCK]);
577 
578 		for (i=2; i<= RTAX_MAX; i++) {
579 			__u32 val;
580 
581 			if (mxrta[i] == NULL)
582 				continue;
583 
584 			if (i != RTAX_CC_ALGO)
585 				val = rta_getattr_u32(mxrta[i]);
586 
587 			if (i == RTAX_HOPLIMIT && (int)val == -1)
588 				continue;
589 
590 			if (i < sizeof(mx_names)/sizeof(char*) && mx_names[i])
591 				fprintf(fp, " %s", mx_names[i]);
592 			else
593 				fprintf(fp, " metric %d", i);
594 
595 			if (mxlock & (1<<i))
596 				fprintf(fp, " lock");
597 
598 			switch (i) {
599 			case RTAX_FEATURES:
600 				print_rtax_features(fp, val);
601 				break;
602 			default:
603 				fprintf(fp, " %u", val);
604 				break;
605 
606 			case RTAX_RTT:
607 			case RTAX_RTTVAR:
608 			case RTAX_RTO_MIN:
609 				if (i == RTAX_RTT)
610 					val /= 8;
611 				else if (i == RTAX_RTTVAR)
612 					val /= 4;
613 
614 				if (val >= 1000)
615 					fprintf(fp, " %gs", val/1e3);
616 				else
617 					fprintf(fp, " %ums", val);
618 				break;
619 			case RTAX_CC_ALGO:
620 				fprintf(fp, " %s", rta_getattr_str(mxrta[i]));
621 				break;
622 			}
623 		}
624 	}
625 	if (tb[RTA_IIF] && filter.iifmask != -1) {
626 		fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
627 	}
628 	if (tb[RTA_MULTIPATH]) {
629 		struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
630 		int first = 0;
631 
632 		len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
633 
634 		for (;;) {
635 			if (len < sizeof(*nh))
636 				break;
637 			if (nh->rtnh_len > len)
638 				break;
639 			if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
640 				if (first)
641 					fprintf(fp, " Oifs:");
642 				else
643 					fprintf(fp, " ");
644 			} else
645 				fprintf(fp, "%s\tnexthop", _SL_);
646 			if (nh->rtnh_len > sizeof(*nh)) {
647 				parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh), nh->rtnh_len - sizeof(*nh));
648 
649 				if (tb[RTA_ENCAP])
650 					lwt_print_encap(fp,
651 							tb[RTA_ENCAP_TYPE],
652 							tb[RTA_ENCAP]);
653 
654 				if (tb[RTA_GATEWAY]) {
655 					fprintf(fp, " via %s ",
656 						format_host(r->rtm_family,
657 							    RTA_PAYLOAD(tb[RTA_GATEWAY]),
658 							    RTA_DATA(tb[RTA_GATEWAY]),
659 							    abuf, sizeof(abuf)));
660 				}
661 				if (tb[RTA_VIA]) {
662 					size_t len = RTA_PAYLOAD(tb[RTA_VIA]) - 2;
663 					struct rtvia *via = RTA_DATA(tb[RTA_VIA]);
664 					fprintf(fp, "via %s %s ",
665 						family_name(via->rtvia_family),
666 						format_host(via->rtvia_family, len, via->rtvia_addr,
667 							    abuf, sizeof(abuf)));
668 				}
669 				if (tb[RTA_FLOW]) {
670 					__u32 to = rta_getattr_u32(tb[RTA_FLOW]);
671 					__u32 from = to>>16;
672 					to &= 0xFFFF;
673 					fprintf(fp, " realm%s ", from ? "s" : "");
674 					if (from) {
675 						fprintf(fp, "%s/",
676 							rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
677 					}
678 					fprintf(fp, "%s",
679 						rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
680 				}
681 			}
682 			if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
683 				fprintf(fp, " %s", ll_index_to_name(nh->rtnh_ifindex));
684 				if (nh->rtnh_hops != 1)
685 					fprintf(fp, "(ttl>%d)", nh->rtnh_hops);
686 			} else {
687 				fprintf(fp, " dev %s", ll_index_to_name(nh->rtnh_ifindex));
688 				fprintf(fp, " weight %d", nh->rtnh_hops+1);
689 			}
690 			if (nh->rtnh_flags & RTNH_F_DEAD)
691 				fprintf(fp, " dead");
692 			if (nh->rtnh_flags & RTNH_F_ONLINK)
693 				fprintf(fp, " onlink");
694 			if (nh->rtnh_flags & RTNH_F_PERVASIVE)
695 				fprintf(fp, " pervasive");
696 			if (nh->rtnh_flags & RTNH_F_LINKDOWN)
697 				fprintf(fp, " linkdown");
698 			len -= NLMSG_ALIGN(nh->rtnh_len);
699 			nh = RTNH_NEXT(nh);
700 		}
701 	}
702 	if (tb[RTA_PREF]) {
703 		unsigned int pref = rta_getattr_u8(tb[RTA_PREF]);
704 		fprintf(fp, " pref ");
705 
706 		switch (pref) {
707 		case ICMPV6_ROUTER_PREF_LOW:
708 			fprintf(fp, "low");
709 			break;
710 		case ICMPV6_ROUTER_PREF_MEDIUM:
711 			fprintf(fp, "medium");
712 			break;
713 		case ICMPV6_ROUTER_PREF_HIGH:
714 			fprintf(fp, "high");
715 			break;
716 		default:
717 			fprintf(fp, "%u", pref);
718 		}
719 	}
720 	fprintf(fp, "\n");
721 	fflush(fp);
722 	return 0;
723 }
724 
parse_one_nh(struct nlmsghdr * n,struct rtmsg * r,struct rtattr * rta,struct rtnexthop * rtnh,int * argcp,char *** argvp)725 static int parse_one_nh(struct nlmsghdr *n, struct rtmsg *r,
726 			struct rtattr *rta, struct rtnexthop *rtnh,
727 			int *argcp, char ***argvp)
728 {
729 	int argc = *argcp;
730 	char **argv = *argvp;
731 
732 	while (++argv, --argc > 0) {
733 		if (strcmp(*argv, "via") == 0) {
734 			inet_prefix addr;
735 			int family;
736 			NEXT_ARG();
737 			family = read_family(*argv);
738 			if (family == AF_UNSPEC)
739 				family = r->rtm_family;
740 			else
741 				NEXT_ARG();
742 			get_addr(&addr, *argv, family);
743 			if (r->rtm_family == AF_UNSPEC)
744 				r->rtm_family = addr.family;
745 			if (addr.family == r->rtm_family) {
746 				rta_addattr_l(rta, 4096, RTA_GATEWAY, &addr.data, addr.bytelen);
747 				rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen;
748 			} else {
749 				rta_addattr_l(rta, 4096, RTA_VIA, &addr.family, addr.bytelen+2);
750 				rtnh->rtnh_len += sizeof(struct rtattr) + addr.bytelen+2;
751 			}
752 		} else if (strcmp(*argv, "dev") == 0) {
753 			NEXT_ARG();
754 			if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
755 				fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
756 				exit(1);
757 			}
758 		} else if (strcmp(*argv, "weight") == 0) {
759 			unsigned w;
760 			NEXT_ARG();
761 			if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
762 				invarg("\"weight\" is invalid\n", *argv);
763 			rtnh->rtnh_hops = w - 1;
764 		} else if (strcmp(*argv, "onlink") == 0) {
765 			rtnh->rtnh_flags |= RTNH_F_ONLINK;
766 		} else if (matches(*argv, "realms") == 0) {
767 			__u32 realm;
768 			NEXT_ARG();
769 			if (get_rt_realms_or_raw(&realm, *argv))
770 				invarg("\"realm\" value is invalid\n", *argv);
771 			rta_addattr32(rta, 4096, RTA_FLOW, realm);
772 			rtnh->rtnh_len += sizeof(struct rtattr) + 4;
773 		} else if (strcmp(*argv, "encap") == 0) {
774 			int len = rta->rta_len;
775 
776 			lwt_parse_encap(rta, 4096, &argc, &argv);
777 			rtnh->rtnh_len += rta->rta_len - len;
778 		} else
779 			break;
780 	}
781 	*argcp = argc;
782 	*argvp = argv;
783 	return 0;
784 }
785 
parse_nexthops(struct nlmsghdr * n,struct rtmsg * r,int argc,char ** argv)786 static int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r,
787 			  int argc, char **argv)
788 {
789 	char buf[1024];
790 	struct rtattr *rta = (void*)buf;
791 	struct rtnexthop *rtnh;
792 
793 	rta->rta_type = RTA_MULTIPATH;
794 	rta->rta_len = RTA_LENGTH(0);
795 	rtnh = RTA_DATA(rta);
796 
797 	while (argc > 0) {
798 		if (strcmp(*argv, "nexthop") != 0) {
799 			fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
800 			exit(-1);
801 		}
802 		if (argc <= 1) {
803 			fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
804 			exit(-1);
805 		}
806 		memset(rtnh, 0, sizeof(*rtnh));
807 		rtnh->rtnh_len = sizeof(*rtnh);
808 		rta->rta_len += rtnh->rtnh_len;
809 		parse_one_nh(n, r, rta, rtnh, &argc, &argv);
810 		rtnh = RTNH_NEXT(rtnh);
811 	}
812 
813 	if (rta->rta_len > RTA_LENGTH(0))
814 		addattr_l(n, 1024, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta));
815 	return 0;
816 }
817 
iproute_modify(int cmd,unsigned flags,int argc,char ** argv)818 static int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
819 {
820 	struct {
821 		struct nlmsghdr	n;
822 		struct rtmsg		r;
823 		char  			buf[1024];
824 	} req;
825 	char  mxbuf[256];
826 	struct rtattr * mxrta = (void*)mxbuf;
827 	unsigned mxlock = 0;
828 	char  *d = NULL;
829 	int gw_ok = 0;
830 	int dst_ok = 0;
831 	int nhs_ok = 0;
832 	int scope_ok = 0;
833 	int table_ok = 0;
834 	int raw = 0;
835 	int type_ok = 0;
836 	static int hz;
837 
838 	memset(&req, 0, sizeof(req));
839 
840 	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
841 	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
842 	req.n.nlmsg_type = cmd;
843 	req.r.rtm_family = preferred_family;
844 	req.r.rtm_table = RT_TABLE_MAIN;
845 	req.r.rtm_scope = RT_SCOPE_NOWHERE;
846 
847 	if (cmd != RTM_DELROUTE) {
848 		req.r.rtm_protocol = RTPROT_BOOT;
849 		req.r.rtm_scope = RT_SCOPE_UNIVERSE;
850 		req.r.rtm_type = RTN_UNICAST;
851 	}
852 
853 	mxrta->rta_type = RTA_METRICS;
854 	mxrta->rta_len = RTA_LENGTH(0);
855 
856 	while (argc > 0) {
857 		if (strcmp(*argv, "src") == 0) {
858 			inet_prefix addr;
859 			NEXT_ARG();
860 			get_addr(&addr, *argv, req.r.rtm_family);
861 			if (req.r.rtm_family == AF_UNSPEC)
862 				req.r.rtm_family = addr.family;
863 			addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
864 		} else if (strcmp(*argv, "as") == 0) {
865 			inet_prefix addr;
866 			NEXT_ARG();
867 			if (strcmp(*argv, "to") == 0) {
868 				NEXT_ARG();
869 			}
870 			get_addr(&addr, *argv, req.r.rtm_family);
871 			if (req.r.rtm_family == AF_UNSPEC)
872 				req.r.rtm_family = addr.family;
873 			addattr_l(&req.n, sizeof(req), RTA_NEWDST, &addr.data, addr.bytelen);
874 		} else if (strcmp(*argv, "via") == 0) {
875 			inet_prefix addr;
876 			int family;
877 			gw_ok = 1;
878 			NEXT_ARG();
879 			family = read_family(*argv);
880 			if (family == AF_UNSPEC)
881 				family = req.r.rtm_family;
882 			else
883 				NEXT_ARG();
884 			get_addr(&addr, *argv, family);
885 			if (req.r.rtm_family == AF_UNSPEC)
886 				req.r.rtm_family = addr.family;
887 			if (addr.family == req.r.rtm_family)
888 				addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
889 			else
890 				addattr_l(&req.n, sizeof(req), RTA_VIA, &addr.family, addr.bytelen+2);
891 		} else if (strcmp(*argv, "from") == 0) {
892 			inet_prefix addr;
893 			NEXT_ARG();
894 			get_prefix(&addr, *argv, req.r.rtm_family);
895 			if (req.r.rtm_family == AF_UNSPEC)
896 				req.r.rtm_family = addr.family;
897 			if (addr.bytelen)
898 				addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
899 			req.r.rtm_src_len = addr.bitlen;
900 		} else if (strcmp(*argv, "tos") == 0 ||
901 			   matches(*argv, "dsfield") == 0) {
902 			__u32 tos;
903 			NEXT_ARG();
904 			if (rtnl_dsfield_a2n(&tos, *argv))
905 				invarg("\"tos\" value is invalid\n", *argv);
906 			req.r.rtm_tos = tos;
907 		} else if (strcmp(*argv, "expires") == 0 ) {
908 			__u32 expires;
909 			NEXT_ARG();
910 			if (get_u32(&expires, *argv, 0))
911 				invarg("\"expires\" value is invalid\n", *argv);
912 			if (!hz)
913 				hz = get_user_hz();
914 			addattr32(&req.n, sizeof(req), RTA_EXPIRES, expires*hz);
915 		} else if (matches(*argv, "metric") == 0 ||
916 			   matches(*argv, "priority") == 0 ||
917 			   strcmp(*argv, "preference") == 0) {
918 			__u32 metric;
919 			NEXT_ARG();
920 			if (get_u32(&metric, *argv, 0))
921 				invarg("\"metric\" value is invalid\n", *argv);
922 			addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
923 		} else if (strcmp(*argv, "scope") == 0) {
924 			__u32 scope = 0;
925 			NEXT_ARG();
926 			if (rtnl_rtscope_a2n(&scope, *argv))
927 				invarg("invalid \"scope\" value\n", *argv);
928 			req.r.rtm_scope = scope;
929 			scope_ok = 1;
930 		} else if (strcmp(*argv, "mtu") == 0) {
931 			unsigned mtu;
932 			NEXT_ARG();
933 			if (strcmp(*argv, "lock") == 0) {
934 				mxlock |= (1<<RTAX_MTU);
935 				NEXT_ARG();
936 			}
937 			if (get_unsigned(&mtu, *argv, 0))
938 				invarg("\"mtu\" value is invalid\n", *argv);
939 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
940 		} else if (strcmp(*argv, "hoplimit") == 0) {
941 			unsigned hoplimit;
942 			NEXT_ARG();
943 			if (strcmp(*argv, "lock") == 0) {
944 				mxlock |= (1<<RTAX_HOPLIMIT);
945 				NEXT_ARG();
946 			}
947 			if (get_unsigned(&hoplimit, *argv, 0) || hoplimit > 255)
948 				invarg("\"hoplimit\" value is invalid\n", *argv);
949 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
950 		} else if (strcmp(*argv, "advmss") == 0) {
951 			unsigned mss;
952 			NEXT_ARG();
953 			if (strcmp(*argv, "lock") == 0) {
954 				mxlock |= (1<<RTAX_ADVMSS);
955 				NEXT_ARG();
956 			}
957 			if (get_unsigned(&mss, *argv, 0))
958 				invarg("\"mss\" value is invalid\n", *argv);
959 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
960 		} else if (matches(*argv, "reordering") == 0) {
961 			unsigned reord;
962 			NEXT_ARG();
963 			if (strcmp(*argv, "lock") == 0) {
964 				mxlock |= (1<<RTAX_REORDERING);
965 				NEXT_ARG();
966 			}
967 			if (get_unsigned(&reord, *argv, 0))
968 				invarg("\"reordering\" value is invalid\n", *argv);
969 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
970 		} else if (strcmp(*argv, "rtt") == 0) {
971 			unsigned rtt;
972 			NEXT_ARG();
973 			if (strcmp(*argv, "lock") == 0) {
974 				mxlock |= (1<<RTAX_RTT);
975 				NEXT_ARG();
976 			}
977 			if (get_time_rtt(&rtt, *argv, &raw))
978 				invarg("\"rtt\" value is invalid\n", *argv);
979 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
980 				(raw) ? rtt : rtt * 8);
981 		} else if (strcmp(*argv, "rto_min") == 0) {
982 			unsigned rto_min;
983 			NEXT_ARG();
984 			mxlock |= (1<<RTAX_RTO_MIN);
985 			if (get_time_rtt(&rto_min, *argv, &raw))
986 				invarg("\"rto_min\" value is invalid\n",
987 				       *argv);
988 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
989 				      rto_min);
990 		} else if (matches(*argv, "window") == 0) {
991 			unsigned win;
992 			NEXT_ARG();
993 			if (strcmp(*argv, "lock") == 0) {
994 				mxlock |= (1<<RTAX_WINDOW);
995 				NEXT_ARG();
996 			}
997 			if (get_unsigned(&win, *argv, 0))
998 				invarg("\"window\" value is invalid\n", *argv);
999 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
1000 		} else if (matches(*argv, "cwnd") == 0) {
1001 			unsigned win;
1002 			NEXT_ARG();
1003 			if (strcmp(*argv, "lock") == 0) {
1004 				mxlock |= (1<<RTAX_CWND);
1005 				NEXT_ARG();
1006 			}
1007 			if (get_unsigned(&win, *argv, 0))
1008 				invarg("\"cwnd\" value is invalid\n", *argv);
1009 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
1010 		} else if (matches(*argv, "initcwnd") == 0) {
1011 			unsigned win;
1012 			NEXT_ARG();
1013 			if (strcmp(*argv, "lock") == 0) {
1014 				mxlock |= (1<<RTAX_INITCWND);
1015 				NEXT_ARG();
1016 			}
1017 			if (get_unsigned(&win, *argv, 0))
1018 				invarg("\"initcwnd\" value is invalid\n", *argv);
1019 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
1020 		} else if (matches(*argv, "initrwnd") == 0) {
1021 			unsigned win;
1022 			NEXT_ARG();
1023 			if (strcmp(*argv, "lock") == 0) {
1024 				mxlock |= (1<<RTAX_INITRWND);
1025 				NEXT_ARG();
1026 			}
1027 			if (get_unsigned(&win, *argv, 0))
1028 				invarg("\"initrwnd\" value is invalid\n", *argv);
1029 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITRWND, win);
1030 		} else if (matches(*argv, "features") == 0) {
1031 			unsigned int features = 0;
1032 
1033 			while (argc > 0) {
1034 				NEXT_ARG();
1035 
1036 				if (strcmp(*argv, "ecn") == 0)
1037 					features |= RTAX_FEATURE_ECN;
1038 				else
1039 					invarg("\"features\" value not valid\n", *argv);
1040 				break;
1041 			}
1042 
1043 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_FEATURES, features);
1044 		} else if (matches(*argv, "quickack") == 0) {
1045 			unsigned quickack;
1046 			NEXT_ARG();
1047 			if (get_unsigned(&quickack, *argv, 0))
1048 				invarg("\"quickack\" value is invalid\n", *argv);
1049 			if (quickack != 1 && quickack != 0)
1050 				invarg("\"quickack\" value should be 0 or 1\n", *argv);
1051 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_QUICKACK, quickack);
1052 		} else if (matches(*argv, "congctl") == 0) {
1053 			NEXT_ARG();
1054 			if (strcmp(*argv, "lock") == 0) {
1055 				mxlock |= 1 << RTAX_CC_ALGO;
1056 				NEXT_ARG();
1057 			}
1058 			rta_addattr_l(mxrta, sizeof(mxbuf), RTAX_CC_ALGO, *argv,
1059 				      strlen(*argv));
1060 		} else if (matches(*argv, "rttvar") == 0) {
1061 			unsigned win;
1062 			NEXT_ARG();
1063 			if (strcmp(*argv, "lock") == 0) {
1064 				mxlock |= (1<<RTAX_RTTVAR);
1065 				NEXT_ARG();
1066 			}
1067 			if (get_time_rtt(&win, *argv, &raw))
1068 				invarg("\"rttvar\" value is invalid\n", *argv);
1069 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
1070 				(raw) ? win : win * 4);
1071 		} else if (matches(*argv, "ssthresh") == 0) {
1072 			unsigned win;
1073 			NEXT_ARG();
1074 			if (strcmp(*argv, "lock") == 0) {
1075 				mxlock |= (1<<RTAX_SSTHRESH);
1076 				NEXT_ARG();
1077 			}
1078 			if (get_unsigned(&win, *argv, 0))
1079 				invarg("\"ssthresh\" value is invalid\n", *argv);
1080 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
1081 		} else if (matches(*argv, "realms") == 0) {
1082 			__u32 realm;
1083 			NEXT_ARG();
1084 			if (get_rt_realms_or_raw(&realm, *argv))
1085 				invarg("\"realm\" value is invalid\n", *argv);
1086 			addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
1087 		} else if (strcmp(*argv, "onlink") == 0) {
1088 			req.r.rtm_flags |= RTNH_F_ONLINK;
1089 		} else if (strcmp(*argv, "nexthop") == 0) {
1090 			nhs_ok = 1;
1091 			break;
1092 		} else if (matches(*argv, "protocol") == 0) {
1093 			__u32 prot;
1094 			NEXT_ARG();
1095 			if (rtnl_rtprot_a2n(&prot, *argv))
1096 				invarg("\"protocol\" value is invalid\n", *argv);
1097 			req.r.rtm_protocol = prot;
1098 		} else if (matches(*argv, "table") == 0) {
1099 			__u32 tid;
1100 			NEXT_ARG();
1101 			if (rtnl_rttable_a2n(&tid, *argv))
1102 				invarg("\"table\" value is invalid\n", *argv);
1103 			if (tid < 256)
1104 				req.r.rtm_table = tid;
1105 			else {
1106 				req.r.rtm_table = RT_TABLE_UNSPEC;
1107 				addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
1108 			}
1109 			table_ok = 1;
1110 		} else if (strcmp(*argv, "dev") == 0 ||
1111 			   strcmp(*argv, "oif") == 0) {
1112 			NEXT_ARG();
1113 			d = *argv;
1114 		} else if (matches(*argv, "pref") == 0) {
1115 			__u8 pref;
1116 			NEXT_ARG();
1117 			if (strcmp(*argv, "low") == 0)
1118 				pref = ICMPV6_ROUTER_PREF_LOW;
1119 			else if (strcmp(*argv, "medium") == 0)
1120 				pref = ICMPV6_ROUTER_PREF_MEDIUM;
1121 			else if (strcmp(*argv, "high") == 0)
1122 				pref = ICMPV6_ROUTER_PREF_HIGH;
1123 			else if (get_u8(&pref, *argv, 0))
1124 				invarg("\"pref\" value is invalid\n", *argv);
1125 			addattr8(&req.n, sizeof(req), RTA_PREF, pref);
1126 		} else if (strcmp(*argv, "encap") == 0) {
1127 			char buf[1024];
1128 			struct rtattr *rta = (void*)buf;
1129 
1130 			rta->rta_type = RTA_ENCAP;
1131 			rta->rta_len = RTA_LENGTH(0);
1132 
1133 			lwt_parse_encap(rta, sizeof(buf), &argc, &argv);
1134 
1135 			if (rta->rta_len > RTA_LENGTH(0))
1136 				addraw_l(&req.n, 1024, RTA_DATA(rta), RTA_PAYLOAD(rta));
1137 		} else {
1138 			int type;
1139 			inet_prefix dst;
1140 
1141 			if (strcmp(*argv, "to") == 0) {
1142 				NEXT_ARG();
1143 			}
1144 			if ((**argv < '0' || **argv > '9') &&
1145 			    rtnl_rtntype_a2n(&type, *argv) == 0) {
1146 				NEXT_ARG();
1147 				req.r.rtm_type = type;
1148 				type_ok = 1;
1149 			}
1150 
1151 			if (matches(*argv, "help") == 0)
1152 				usage();
1153 			if (dst_ok)
1154 				duparg2("to", *argv);
1155 			get_prefix(&dst, *argv, req.r.rtm_family);
1156 			if (req.r.rtm_family == AF_UNSPEC)
1157 				req.r.rtm_family = dst.family;
1158 			req.r.rtm_dst_len = dst.bitlen;
1159 			dst_ok = 1;
1160 			if (dst.bytelen)
1161 				addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
1162 		}
1163 		argc--; argv++;
1164 	}
1165 
1166 	if (!dst_ok)
1167 		usage();
1168 
1169 	if (d || nhs_ok)  {
1170 		int idx;
1171 
1172 		if (d) {
1173 			if ((idx = ll_name_to_index(d)) == 0) {
1174 				fprintf(stderr, "Cannot find device \"%s\"\n", d);
1175 				return -1;
1176 			}
1177 			addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1178 		}
1179 	}
1180 
1181 	if (mxrta->rta_len > RTA_LENGTH(0)) {
1182 		if (mxlock)
1183 			rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
1184 		addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
1185 	}
1186 
1187 	if (nhs_ok)
1188 		parse_nexthops(&req.n, &req.r, argc, argv);
1189 
1190 	if (req.r.rtm_family == AF_UNSPEC)
1191 		req.r.rtm_family = AF_INET;
1192 
1193 	if (!table_ok) {
1194 		if (req.r.rtm_type == RTN_LOCAL ||
1195 		    req.r.rtm_type == RTN_BROADCAST ||
1196 		    req.r.rtm_type == RTN_NAT ||
1197 		    req.r.rtm_type == RTN_ANYCAST)
1198 			req.r.rtm_table = RT_TABLE_LOCAL;
1199 	}
1200 	if (!scope_ok) {
1201 		if (req.r.rtm_family == AF_INET6 ||
1202 		    req.r.rtm_family == AF_MPLS)
1203 			req.r.rtm_scope = RT_SCOPE_UNIVERSE;
1204 		else if (req.r.rtm_type == RTN_LOCAL ||
1205 			 req.r.rtm_type == RTN_NAT)
1206 			req.r.rtm_scope = RT_SCOPE_HOST;
1207 		else if (req.r.rtm_type == RTN_BROADCAST ||
1208 			 req.r.rtm_type == RTN_MULTICAST ||
1209 			 req.r.rtm_type == RTN_ANYCAST)
1210 			req.r.rtm_scope = RT_SCOPE_LINK;
1211 		else if (req.r.rtm_type == RTN_UNICAST ||
1212 			 req.r.rtm_type == RTN_UNSPEC) {
1213 			if (cmd == RTM_DELROUTE)
1214 				req.r.rtm_scope = RT_SCOPE_NOWHERE;
1215 			else if (!gw_ok && !nhs_ok)
1216 				req.r.rtm_scope = RT_SCOPE_LINK;
1217 		}
1218 	}
1219 
1220 	if (!type_ok && req.r.rtm_family == AF_MPLS)
1221 		req.r.rtm_type = RTN_UNICAST;
1222 
1223 	if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
1224 		return -2;
1225 
1226 	return 0;
1227 }
1228 
rtnl_rtcache_request(struct rtnl_handle * rth,int family)1229 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
1230 {
1231 	struct {
1232 		struct nlmsghdr nlh;
1233 		struct rtmsg rtm;
1234 	} req;
1235 	struct sockaddr_nl nladdr;
1236 
1237 	memset(&nladdr, 0, sizeof(nladdr));
1238 	memset(&req, 0, sizeof(req));
1239 	nladdr.nl_family = AF_NETLINK;
1240 
1241 	req.nlh.nlmsg_len = sizeof(req);
1242 	req.nlh.nlmsg_type = RTM_GETROUTE;
1243 	req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
1244 	req.nlh.nlmsg_pid = 0;
1245 	req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
1246 	req.rtm.rtm_family = family;
1247 	req.rtm.rtm_flags |= RTM_F_CLONED;
1248 
1249 	return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
1250 }
1251 
iproute_flush_cache(void)1252 static int iproute_flush_cache(void)
1253 {
1254 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
1255 
1256 	int len;
1257 	int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
1258 	char *buffer = "-1";
1259 
1260 	if (flush_fd < 0) {
1261 		fprintf (stderr, "Cannot open \"%s\": %s\n",
1262 				ROUTE_FLUSH_PATH, strerror(errno));
1263 		return -1;
1264 	}
1265 
1266 	len = strlen (buffer);
1267 
1268 	if ((write (flush_fd, (void *)buffer, len)) < len) {
1269 		fprintf (stderr, "Cannot flush routing cache\n");
1270 		close(flush_fd);
1271 		return -1;
1272 	}
1273 	close(flush_fd);
1274 	return 0;
1275 }
1276 
1277 static __u32 route_dump_magic = 0x45311224;
1278 
save_route(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)1279 static int save_route(const struct sockaddr_nl *who, struct nlmsghdr *n,
1280 		      void *arg)
1281 {
1282 	int ret;
1283 	int len = n->nlmsg_len;
1284 	struct rtmsg *r = NLMSG_DATA(n);
1285 	struct rtattr *tb[RTA_MAX+1];
1286 	int host_len;
1287 
1288 	host_len = af_bit_len(r->rtm_family);
1289 	len -= NLMSG_LENGTH(sizeof(*r));
1290 	parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1291 
1292 	if (!filter_nlmsg(n, tb, host_len))
1293 		return 0;
1294 
1295 	ret = write(STDOUT_FILENO, n, n->nlmsg_len);
1296 	if ((ret > 0) && (ret != n->nlmsg_len)) {
1297 		fprintf(stderr, "Short write while saving nlmsg\n");
1298 		ret = -EIO;
1299 	}
1300 
1301 	return ret == n->nlmsg_len ? 0 : ret;
1302 }
1303 
save_route_prep(void)1304 static int save_route_prep(void)
1305 {
1306 	int ret;
1307 
1308 	if (isatty(STDOUT_FILENO)) {
1309 		fprintf(stderr, "Not sending a binary stream to stdout\n");
1310 		return -1;
1311 	}
1312 
1313 	ret = write(STDOUT_FILENO, &route_dump_magic, sizeof(route_dump_magic));
1314 	if (ret != sizeof(route_dump_magic)) {
1315 		fprintf(stderr, "Can't write magic to dump file\n");
1316 		return -1;
1317 	}
1318 
1319 	return 0;
1320 }
1321 
iproute_list_flush_or_save(int argc,char ** argv,int action)1322 static int iproute_list_flush_or_save(int argc, char **argv, int action)
1323 {
1324 	int do_ipv6 = preferred_family;
1325 	char *id = NULL;
1326 	char *od = NULL;
1327 	unsigned int mark = 0;
1328 	rtnl_filter_t filter_fn;
1329 
1330 	if (action == IPROUTE_SAVE) {
1331 		if (save_route_prep())
1332 			return -1;
1333 
1334 		filter_fn = save_route;
1335 	} else
1336 		filter_fn = print_route;
1337 
1338 	iproute_reset_filter(0);
1339 	filter.tb = RT_TABLE_MAIN;
1340 
1341 	if ((action == IPROUTE_FLUSH) && argc <= 0) {
1342 		fprintf(stderr, "\"ip route flush\" requires arguments.\n");
1343 		return -1;
1344 	}
1345 
1346 	while (argc > 0) {
1347 		if (matches(*argv, "table") == 0) {
1348 			__u32 tid;
1349 			NEXT_ARG();
1350 			if (rtnl_rttable_a2n(&tid, *argv)) {
1351 				if (strcmp(*argv, "all") == 0) {
1352 					filter.tb = 0;
1353 				} else if (strcmp(*argv, "cache") == 0) {
1354 					filter.cloned = 1;
1355 				} else if (strcmp(*argv, "help") == 0) {
1356 					usage();
1357 				} else {
1358 					invarg("table id value is invalid\n", *argv);
1359 				}
1360 			} else
1361 				filter.tb = tid;
1362 		} else if (matches(*argv, "cached") == 0 ||
1363 			   matches(*argv, "cloned") == 0) {
1364 			filter.cloned = 1;
1365 		} else if (strcmp(*argv, "tos") == 0 ||
1366 			   matches(*argv, "dsfield") == 0) {
1367 			__u32 tos;
1368 			NEXT_ARG();
1369 			if (rtnl_dsfield_a2n(&tos, *argv))
1370 				invarg("TOS value is invalid\n", *argv);
1371 			filter.tos = tos;
1372 			filter.tosmask = -1;
1373 		} else if (matches(*argv, "protocol") == 0) {
1374 			__u32 prot = 0;
1375 			NEXT_ARG();
1376 			filter.protocolmask = -1;
1377 			if (rtnl_rtprot_a2n(&prot, *argv)) {
1378 				if (strcmp(*argv, "all") != 0)
1379 					invarg("invalid \"protocol\"\n", *argv);
1380 				prot = 0;
1381 				filter.protocolmask = 0;
1382 			}
1383 			filter.protocol = prot;
1384 		} else if (matches(*argv, "scope") == 0) {
1385 			__u32 scope = 0;
1386 			NEXT_ARG();
1387 			filter.scopemask = -1;
1388 			if (rtnl_rtscope_a2n(&scope, *argv)) {
1389 				if (strcmp(*argv, "all") != 0)
1390 					invarg("invalid \"scope\"\n", *argv);
1391 				scope = RT_SCOPE_NOWHERE;
1392 				filter.scopemask = 0;
1393 			}
1394 			filter.scope = scope;
1395 		} else if (matches(*argv, "type") == 0) {
1396 			int type;
1397 			NEXT_ARG();
1398 			filter.typemask = -1;
1399 			if (rtnl_rtntype_a2n(&type, *argv))
1400 				invarg("node type value is invalid\n", *argv);
1401 			filter.type = type;
1402 		} else if (strcmp(*argv, "dev") == 0 ||
1403 			   strcmp(*argv, "oif") == 0) {
1404 			NEXT_ARG();
1405 			od = *argv;
1406 		} else if (strcmp(*argv, "iif") == 0) {
1407 			NEXT_ARG();
1408 			id = *argv;
1409 		} else if (strcmp(*argv, "mark") == 0) {
1410 			NEXT_ARG();
1411 			get_unsigned(&mark, *argv, 0);
1412 			filter.markmask = -1;
1413 		} else if (strcmp(*argv, "via") == 0) {
1414 			int family;
1415 			NEXT_ARG();
1416 			family = read_family(*argv);
1417 			if (family == AF_UNSPEC)
1418 				family = do_ipv6;
1419 			else
1420 				NEXT_ARG();
1421 			get_prefix(&filter.rvia, *argv, family);
1422 		} else if (strcmp(*argv, "src") == 0) {
1423 			NEXT_ARG();
1424 			get_prefix(&filter.rprefsrc, *argv, do_ipv6);
1425 		} else if (matches(*argv, "realms") == 0) {
1426 			__u32 realm;
1427 			NEXT_ARG();
1428 			if (get_rt_realms_or_raw(&realm, *argv))
1429 				invarg("invalid realms\n", *argv);
1430 			filter.realm = realm;
1431 			filter.realmmask = ~0U;
1432 			if ((filter.realm&0xFFFF) == 0 &&
1433 			    (*argv)[strlen(*argv) - 1] == '/')
1434 				filter.realmmask &= ~0xFFFF;
1435 			if ((filter.realm&0xFFFF0000U) == 0 &&
1436 			    (strchr(*argv, '/') == NULL ||
1437 			     (*argv)[0] == '/'))
1438 				filter.realmmask &= ~0xFFFF0000U;
1439 		} else if (matches(*argv, "from") == 0) {
1440 			NEXT_ARG();
1441 			if (matches(*argv, "root") == 0) {
1442 				NEXT_ARG();
1443 				get_prefix(&filter.rsrc, *argv, do_ipv6);
1444 			} else if (matches(*argv, "match") == 0) {
1445 				NEXT_ARG();
1446 				get_prefix(&filter.msrc, *argv, do_ipv6);
1447 			} else {
1448 				if (matches(*argv, "exact") == 0) {
1449 					NEXT_ARG();
1450 				}
1451 				get_prefix(&filter.msrc, *argv, do_ipv6);
1452 				filter.rsrc = filter.msrc;
1453 			}
1454 		} else {
1455 			if (matches(*argv, "to") == 0) {
1456 				NEXT_ARG();
1457 			}
1458 			if (matches(*argv, "root") == 0) {
1459 				NEXT_ARG();
1460 				get_prefix(&filter.rdst, *argv, do_ipv6);
1461 			} else if (matches(*argv, "match") == 0) {
1462 				NEXT_ARG();
1463 				get_prefix(&filter.mdst, *argv, do_ipv6);
1464 			} else {
1465 				if (matches(*argv, "exact") == 0) {
1466 					NEXT_ARG();
1467 				}
1468 				get_prefix(&filter.mdst, *argv, do_ipv6);
1469 				filter.rdst = filter.mdst;
1470 			}
1471 		}
1472 		argc--; argv++;
1473 	}
1474 
1475 	if (do_ipv6 == AF_UNSPEC && filter.tb)
1476 		do_ipv6 = AF_INET;
1477 
1478 	if (id || od)  {
1479 		int idx;
1480 
1481 		if (id) {
1482 			if ((idx = ll_name_to_index(id)) == 0) {
1483 				fprintf(stderr, "Cannot find device \"%s\"\n", id);
1484 				return -1;
1485 			}
1486 			filter.iif = idx;
1487 			filter.iifmask = -1;
1488 		}
1489 		if (od) {
1490 			if ((idx = ll_name_to_index(od)) == 0) {
1491 				fprintf(stderr, "Cannot find device \"%s\"\n", od);
1492 				return -1;
1493 			}
1494 			filter.oif = idx;
1495 			filter.oifmask = -1;
1496 		}
1497 	}
1498 	filter.mark = mark;
1499 
1500 	if (action == IPROUTE_FLUSH) {
1501 		int round = 0;
1502 		char flushb[4096-512];
1503 		time_t start = time(0);
1504 
1505 		if (filter.cloned) {
1506 			if (do_ipv6 != AF_INET6) {
1507 				iproute_flush_cache();
1508 				if (show_stats)
1509 					printf("*** IPv4 routing cache is flushed.\n");
1510 			}
1511 			if (do_ipv6 == AF_INET)
1512 				return 0;
1513 		}
1514 
1515 		filter.flushb = flushb;
1516 		filter.flushp = 0;
1517 		filter.flushe = sizeof(flushb);
1518 
1519 		for (;;) {
1520 			if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1521 				perror("Cannot send dump request");
1522 				exit(1);
1523 			}
1524 			filter.flushed = 0;
1525 			if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1526 				fprintf(stderr, "Flush terminated\n");
1527 				exit(1);
1528 			}
1529 			if (filter.flushed == 0) {
1530 				if (show_stats) {
1531 					if (round == 0 && (!filter.cloned || do_ipv6 == AF_INET6))
1532 						printf("Nothing to flush.\n");
1533 					else
1534 						printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":"");
1535 				}
1536 				fflush(stdout);
1537 				return 0;
1538 			}
1539 			round++;
1540 			if (flush_update() < 0)
1541 				exit(1);
1542 
1543 			if (time(0) - start > 30) {
1544 				printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
1545 				       (long)(time(0) - start), filter.flushed);
1546 				exit(1);
1547 			}
1548 
1549 			if (show_stats) {
1550 				printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
1551 				fflush(stdout);
1552 			}
1553 		}
1554 	}
1555 
1556 	if (!filter.cloned) {
1557 		if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1558 			perror("Cannot send dump request");
1559 			exit(1);
1560 		}
1561 	} else {
1562 		if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
1563 			perror("Cannot send dump request");
1564 			exit(1);
1565 		}
1566 	}
1567 
1568 	if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1569 		fprintf(stderr, "Dump terminated\n");
1570 		exit(1);
1571 	}
1572 
1573 	exit(0);
1574 }
1575 
1576 
iproute_get(int argc,char ** argv)1577 static int iproute_get(int argc, char **argv)
1578 {
1579 	struct {
1580 		struct nlmsghdr	n;
1581 		struct rtmsg		r;
1582 		char  			buf[1024];
1583 	} req;
1584 	char  *idev = NULL;
1585 	char  *odev = NULL;
1586 	int connected = 0;
1587 	int from_ok = 0;
1588 	unsigned int mark = 0;
1589 
1590 	memset(&req, 0, sizeof(req));
1591 
1592 	iproute_reset_filter(0);
1593 	filter.cloned = 2;
1594 
1595 	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
1596 	req.n.nlmsg_flags = NLM_F_REQUEST;
1597 	req.n.nlmsg_type = RTM_GETROUTE;
1598 	req.r.rtm_family = preferred_family;
1599 	req.r.rtm_table = 0;
1600 	req.r.rtm_protocol = 0;
1601 	req.r.rtm_scope = 0;
1602 	req.r.rtm_type = 0;
1603 	req.r.rtm_src_len = 0;
1604 	req.r.rtm_dst_len = 0;
1605 	req.r.rtm_tos = 0;
1606 
1607 	while (argc > 0) {
1608 		if (strcmp(*argv, "tos") == 0 ||
1609 		    matches(*argv, "dsfield") == 0) {
1610 			__u32 tos;
1611 			NEXT_ARG();
1612 			if (rtnl_dsfield_a2n(&tos, *argv))
1613 				invarg("TOS value is invalid\n", *argv);
1614 			req.r.rtm_tos = tos;
1615 		} else if (matches(*argv, "from") == 0) {
1616 			inet_prefix addr;
1617 			NEXT_ARG();
1618 			if (matches(*argv, "help") == 0)
1619 				usage();
1620 			from_ok = 1;
1621 			get_prefix(&addr, *argv, req.r.rtm_family);
1622 			if (req.r.rtm_family == AF_UNSPEC)
1623 				req.r.rtm_family = addr.family;
1624 			if (addr.bytelen)
1625 				addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
1626 			req.r.rtm_src_len = addr.bitlen;
1627 		} else if (matches(*argv, "iif") == 0) {
1628 			NEXT_ARG();
1629 			idev = *argv;
1630 		} else if (matches(*argv, "mark") == 0) {
1631 			NEXT_ARG();
1632 			get_unsigned(&mark, *argv, 0);
1633 		} else if (matches(*argv, "oif") == 0 ||
1634 			   strcmp(*argv, "dev") == 0) {
1635 			NEXT_ARG();
1636 			odev = *argv;
1637 		} else if (matches(*argv, "notify") == 0) {
1638 			req.r.rtm_flags |= RTM_F_NOTIFY;
1639 		} else if (matches(*argv, "connected") == 0) {
1640 			connected = 1;
1641 		} else if (matches(*argv, "uid") == 0) {
1642 			uid_t uid;
1643 
1644 			NEXT_ARG();
1645 			if (get_unsigned(&uid, *argv, 0))
1646 				invarg("invalid UID\n", *argv);
1647 			addattr32(&req.n, sizeof(req), RTA_UID, uid);
1648 		} else {
1649 			inet_prefix addr;
1650 			if (strcmp(*argv, "to") == 0) {
1651 				NEXT_ARG();
1652 			}
1653 			if (matches(*argv, "help") == 0)
1654 				usage();
1655 			get_prefix(&addr, *argv, req.r.rtm_family);
1656 			if (req.r.rtm_family == AF_UNSPEC)
1657 				req.r.rtm_family = addr.family;
1658 			if (addr.bytelen)
1659 				addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
1660 			req.r.rtm_dst_len = addr.bitlen;
1661 		}
1662 		argc--; argv++;
1663 	}
1664 
1665 	if (req.r.rtm_dst_len == 0) {
1666 		fprintf(stderr, "need at least a destination address\n");
1667 		exit(1);
1668 	}
1669 
1670 	if (idev || odev)  {
1671 		int idx;
1672 
1673 		if (idev) {
1674 			if ((idx = ll_name_to_index(idev)) == 0) {
1675 				fprintf(stderr, "Cannot find device \"%s\"\n", idev);
1676 				return -1;
1677 			}
1678 			addattr32(&req.n, sizeof(req), RTA_IIF, idx);
1679 		}
1680 		if (odev) {
1681 			if ((idx = ll_name_to_index(odev)) == 0) {
1682 				fprintf(stderr, "Cannot find device \"%s\"\n", odev);
1683 				return -1;
1684 			}
1685 			addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1686 		}
1687 	}
1688 	if (mark)
1689 		addattr32(&req.n, sizeof(req), RTA_MARK, mark);
1690 
1691 	if (req.r.rtm_family == AF_UNSPEC)
1692 		req.r.rtm_family = AF_INET;
1693 
1694 	req.r.rtm_flags |= RTM_F_LOOKUP_TABLE;
1695 
1696 	if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0)
1697 		return -2;
1698 
1699 	if (connected && !from_ok) {
1700 		struct rtmsg *r = NLMSG_DATA(&req.n);
1701 		int len = req.n.nlmsg_len;
1702 		struct rtattr * tb[RTA_MAX+1];
1703 
1704 		if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1705 			fprintf(stderr, "An error :-)\n");
1706 			exit(1);
1707 		}
1708 
1709 		if (req.n.nlmsg_type != RTM_NEWROUTE) {
1710 			fprintf(stderr, "Not a route?\n");
1711 			return -1;
1712 		}
1713 		len -= NLMSG_LENGTH(sizeof(*r));
1714 		if (len < 0) {
1715 			fprintf(stderr, "Wrong len %d\n", len);
1716 			return -1;
1717 		}
1718 
1719 		parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1720 
1721 		if (tb[RTA_PREFSRC]) {
1722 			tb[RTA_PREFSRC]->rta_type = RTA_SRC;
1723 			r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
1724 		} else if (!tb[RTA_SRC]) {
1725 			fprintf(stderr, "Failed to connect the route\n");
1726 			return -1;
1727 		}
1728 		if (!odev && tb[RTA_OIF])
1729 			tb[RTA_OIF]->rta_type = 0;
1730 		if (tb[RTA_GATEWAY])
1731 			tb[RTA_GATEWAY]->rta_type = 0;
1732 		if (tb[RTA_VIA])
1733 			tb[RTA_VIA]->rta_type = 0;
1734 		if (!idev && tb[RTA_IIF])
1735 			tb[RTA_IIF]->rta_type = 0;
1736 		req.n.nlmsg_flags = NLM_F_REQUEST;
1737 		req.n.nlmsg_type = RTM_GETROUTE;
1738 
1739 		if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0)
1740 			return -2;
1741 	}
1742 
1743 	if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1744 		fprintf(stderr, "An error :-)\n");
1745 		return -1;
1746 	}
1747 
1748 	return 0;
1749 }
1750 
restore_handler(const struct sockaddr_nl * nl,struct rtnl_ctrl_data * ctrl,struct nlmsghdr * n,void * arg)1751 static int restore_handler(const struct sockaddr_nl *nl,
1752 			   struct rtnl_ctrl_data *ctrl,
1753 			   struct nlmsghdr *n, void *arg)
1754 {
1755 	int ret;
1756 
1757 	n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
1758 
1759 	ll_init_map(&rth);
1760 
1761 	ret = rtnl_talk(&rth, n, n, sizeof(*n));
1762 	if ((ret < 0) && (errno == EEXIST))
1763 		ret = 0;
1764 
1765 	return ret;
1766 }
1767 
route_dump_check_magic(void)1768 static int route_dump_check_magic(void)
1769 {
1770 	int ret;
1771 	__u32 magic = 0;
1772 
1773 	if (isatty(STDIN_FILENO)) {
1774 		fprintf(stderr, "Can't restore route dump from a terminal\n");
1775 		return -1;
1776 	}
1777 
1778 	ret = fread(&magic, sizeof(magic), 1, stdin);
1779 	if (magic != route_dump_magic) {
1780 		fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n", ret, magic);
1781 		return -1;
1782 	}
1783 
1784 	return 0;
1785 }
1786 
iproute_restore(void)1787 static int iproute_restore(void)
1788 {
1789 	if (route_dump_check_magic())
1790 		exit(-1);
1791 
1792 	exit(rtnl_from_file(stdin, &restore_handler, NULL));
1793 }
1794 
show_handler(const struct sockaddr_nl * nl,struct rtnl_ctrl_data * ctrl,struct nlmsghdr * n,void * arg)1795 static int show_handler(const struct sockaddr_nl *nl,
1796 			struct rtnl_ctrl_data *ctrl,
1797 			struct nlmsghdr *n, void *arg)
1798 {
1799 	print_route(nl, n, stdout);
1800 	return 0;
1801 }
1802 
iproute_showdump(void)1803 static int iproute_showdump(void)
1804 {
1805 	if (route_dump_check_magic())
1806 		exit(-1);
1807 
1808 	exit(rtnl_from_file(stdin, &show_handler, NULL));
1809 }
1810 
iproute_reset_filter(int ifindex)1811 void iproute_reset_filter(int ifindex)
1812 {
1813 	memset(&filter, 0, sizeof(filter));
1814 	filter.mdst.bitlen = -1;
1815 	filter.msrc.bitlen = -1;
1816 	filter.oif = ifindex;
1817 	if (filter.oif > 0)
1818 		filter.oifmask = -1;
1819 }
1820 
do_iproute(int argc,char ** argv)1821 int do_iproute(int argc, char **argv)
1822 {
1823 	if (argc < 1)
1824 		return iproute_list_flush_or_save(0, NULL, IPROUTE_LIST);
1825 
1826 	if (matches(*argv, "add") == 0)
1827 		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
1828 				      argc-1, argv+1);
1829 	if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
1830 		return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
1831 				      argc-1, argv+1);
1832 	if (matches(*argv, "replace") == 0)
1833 		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
1834 				      argc-1, argv+1);
1835 	if (matches(*argv, "prepend") == 0)
1836 		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
1837 				      argc-1, argv+1);
1838 	if (matches(*argv, "append") == 0)
1839 		return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
1840 				      argc-1, argv+1);
1841 	if (matches(*argv, "test") == 0)
1842 		return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
1843 				      argc-1, argv+1);
1844 	if (matches(*argv, "delete") == 0)
1845 		return iproute_modify(RTM_DELROUTE, 0,
1846 				      argc-1, argv+1);
1847 	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
1848 	    || matches(*argv, "lst") == 0)
1849 		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_LIST);
1850 	if (matches(*argv, "get") == 0)
1851 		return iproute_get(argc-1, argv+1);
1852 	if (matches(*argv, "flush") == 0)
1853 		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_FLUSH);
1854 	if (matches(*argv, "save") == 0)
1855 		return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_SAVE);
1856 	if (matches(*argv, "restore") == 0)
1857 		return iproute_restore();
1858 	if (matches(*argv, "showdump") == 0)
1859 		return iproute_showdump();
1860 	if (matches(*argv, "help") == 0)
1861 		usage();
1862 	fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
1863 	exit(-1);
1864 }
1865