summaryrefslogtreecommitdiffstats
path: root/lib/route/route_obj.c
blob: 8f1e5155913a2501a4f39dfe8ee4a345bad33aa8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
/*
 * lib/route/route_obj.c	Route Object
 *
 *	This library is free software; you can redistribute it and/or
 *	modify it under the terms of the GNU Lesser General Public
 *	License as published by the Free Software Foundation version 2.1
 *	of the License.
 *
 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
 */

/**
 * @ingroup route
 * @defgroup route_obj Route Object
 *
 * @par Attributes
 * @code
 * Name                                           Default
 * -------------------------------------------------------------
 * routing table                                  RT_TABLE_MAIN
 * scope                                          RT_SCOPE_NOWHERE
 * tos                                            0
 * protocol                                       RTPROT_STATIC
 * prio                                           0
 * family                                         AF_UNSPEC
 * type                                           RTN_UNICAST
 * iif                                            NULL
 * @endcode
 *
 * @{
 */

#include <netlink-private/netlink.h>
#include <netlink/netlink.h>
#include <netlink/cache.h>
#include <netlink/utils.h>
#include <netlink/data.h>
#include <netlink/hashtable.h>
#include <netlink/route/rtnl.h>
#include <netlink/route/route.h>
#include <netlink/route/link.h>
#include <netlink/route/nexthop.h>

/** @cond SKIP */
#define ROUTE_ATTR_FAMILY    0x000001
#define ROUTE_ATTR_TOS       0x000002
#define ROUTE_ATTR_TABLE     0x000004
#define ROUTE_ATTR_PROTOCOL  0x000008
#define ROUTE_ATTR_SCOPE     0x000010
#define ROUTE_ATTR_TYPE      0x000020
#define ROUTE_ATTR_FLAGS     0x000040
#define ROUTE_ATTR_DST       0x000080
#define ROUTE_ATTR_SRC       0x000100
#define ROUTE_ATTR_IIF       0x000200
#define ROUTE_ATTR_OIF       0x000400
#define ROUTE_ATTR_GATEWAY   0x000800
#define ROUTE_ATTR_PRIO      0x001000
#define ROUTE_ATTR_PREF_SRC  0x002000
#define ROUTE_ATTR_METRICS   0x004000
#define ROUTE_ATTR_MULTIPATH 0x008000
#define ROUTE_ATTR_REALMS    0x010000
#define ROUTE_ATTR_CACHEINFO 0x020000
/** @endcond */

static void route_constructor(struct nl_object *c)
{
	struct rtnl_route *r = (struct rtnl_route *) c;

	r->rt_family = AF_UNSPEC;
	r->rt_scope = RT_SCOPE_NOWHERE;
	r->rt_table = RT_TABLE_MAIN;
	r->rt_protocol = RTPROT_STATIC;
	r->rt_type = RTN_UNICAST;
	r->rt_prio = 0;

	nl_init_list_head(&r->rt_nexthops);
}

static void route_free_data(struct nl_object *c)
{
	struct rtnl_route *r = (struct rtnl_route *) c;
	struct rtnl_nexthop *nh, *tmp;

	if (r == NULL)
		return;

	nl_addr_put(r->rt_dst);
	nl_addr_put(r->rt_src);
	nl_addr_put(r->rt_pref_src);

	nl_list_for_each_entry_safe(nh, tmp, &r->rt_nexthops, rtnh_list) {
		rtnl_route_remove_nexthop(r, nh);
		rtnl_route_nh_free(nh);
	}
}

static int route_clone(struct nl_object *_dst, struct nl_object *_src)
{
	struct rtnl_route *dst = (struct rtnl_route *) _dst;
	struct rtnl_route *src = (struct rtnl_route *) _src;
	struct rtnl_nexthop *nh, *new;

	if (src->rt_dst)
		if (!(dst->rt_dst = nl_addr_clone(src->rt_dst)))
			return -NLE_NOMEM;

	if (src->rt_src)
		if (!(dst->rt_src = nl_addr_clone(src->rt_src)))
			return -NLE_NOMEM;

	if (src->rt_pref_src)
		if (!(dst->rt_pref_src = nl_addr_clone(src->rt_pref_src)))
			return -NLE_NOMEM;

	/* Will be inc'ed again while adding the nexthops of the source */
	dst->rt_nr_nh = 0;

	nl_init_list_head(&dst->rt_nexthops);
	nl_list_for_each_entry(nh, &src->rt_nexthops, rtnh_list) {
		new = rtnl_route_nh_clone(nh);
		if (!new)
			return -NLE_NOMEM;

		rtnl_route_add_nexthop(dst, new);
	}

	return 0;
}

static void route_dump_line(struct nl_object *a, struct nl_dump_params *p)
{
	struct rtnl_route *r = (struct rtnl_route *) a;
	int cache = 0, flags;
	char buf[64];

	if (r->rt_flags & RTM_F_CLONED)
		cache = 1;

	nl_dump_line(p, "%s ", nl_af2str(r->rt_family, buf, sizeof(buf)));

	if (cache)
		nl_dump(p, "cache ");

	if (!(r->ce_mask & ROUTE_ATTR_DST) ||
	    nl_addr_get_len(r->rt_dst) == 0)
		nl_dump(p, "default ");
	else
		nl_dump(p, "%s ", nl_addr2str(r->rt_dst, buf, sizeof(buf)));

	if (r->ce_mask & ROUTE_ATTR_TABLE && !cache)
		nl_dump(p, "table %s ",
			rtnl_route_table2str(r->rt_table, buf, sizeof(buf)));

	if (r->ce_mask & ROUTE_ATTR_TYPE)
		nl_dump(p, "type %s ",
			nl_rtntype2str(r->rt_type, buf, sizeof(buf)));

	if (r->ce_mask & ROUTE_ATTR_TOS && r->rt_tos != 0)
		nl_dump(p, "tos %#x ", r->rt_tos);

	if (r->ce_mask & ROUTE_ATTR_MULTIPATH) {
		struct rtnl_nexthop *nh;

		nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) {
			p->dp_ivar = NH_DUMP_FROM_ONELINE;
			rtnl_route_nh_dump(nh, p);
		}
	}

	flags = r->rt_flags & ~(RTM_F_CLONED);
	if (r->ce_mask & ROUTE_ATTR_FLAGS && flags) {

		nl_dump(p, "<");

#define PRINT_FLAG(f) if (flags & RTNH_F_##f) { \
		flags &= ~RTNH_F_##f; nl_dump(p, #f "%s", flags ? "," : ""); }
		PRINT_FLAG(DEAD);
		PRINT_FLAG(ONLINK);
		PRINT_FLAG(PERVASIVE);
#undef PRINT_FLAG

#define PRINT_FLAG(f) if (flags & RTM_F_##f) { \
		flags &= ~RTM_F_##f; nl_dump(p, #f "%s", flags ? "," : ""); }
		PRINT_FLAG(NOTIFY);
		PRINT_FLAG(EQUALIZE);
		PRINT_FLAG(PREFIX);
#undef PRINT_FLAG

#define PRINT_FLAG(f) if (flags & RTCF_##f) { \
		flags &= ~RTCF_##f; nl_dump(p, #f "%s", flags ? "," : ""); }
		PRINT_FLAG(NOTIFY);
		PRINT_FLAG(REDIRECTED);
		PRINT_FLAG(DOREDIRECT);
		PRINT_FLAG(DIRECTSRC);
		PRINT_FLAG(DNAT);
		PRINT_FLAG(BROADCAST);
		PRINT_FLAG(MULTICAST);
		PRINT_FLAG(LOCAL);
#undef PRINT_FLAG

		nl_dump(p, ">");
	}

	nl_dump(p, "\n");
}

static void route_dump_details(struct nl_object *a, struct nl_dump_params *p)
{
	struct rtnl_route *r = (struct rtnl_route *) a;
	struct nl_cache *link_cache;
	char buf[128];
	int i;

	link_cache = nl_cache_mngt_require_safe("route/link");

	route_dump_line(a, p);
	nl_dump_line(p, "    ");

	if (r->ce_mask & ROUTE_ATTR_PREF_SRC)
		nl_dump(p, "preferred-src %s ",
			nl_addr2str(r->rt_pref_src, buf, sizeof(buf)));

	if (r->ce_mask & ROUTE_ATTR_SCOPE && r->rt_scope != RT_SCOPE_NOWHERE)
		nl_dump(p, "scope %s ",
			rtnl_scope2str(r->rt_scope, buf, sizeof(buf)));

	if (r->ce_mask & ROUTE_ATTR_PRIO)
		nl_dump(p, "priority %#x ", r->rt_prio);

	if (r->ce_mask & ROUTE_ATTR_PROTOCOL)
		nl_dump(p, "protocol %s ",
			rtnl_route_proto2str(r->rt_protocol, buf, sizeof(buf)));

	if (r->ce_mask & ROUTE_ATTR_IIF) {
		if (link_cache) {
			nl_dump(p, "iif %s ",
				rtnl_link_i2name(link_cache, r->rt_iif,
						 buf, sizeof(buf)));
		} else
			nl_dump(p, "iif %d ", r->rt_iif);
	}

	if (r->ce_mask & ROUTE_ATTR_SRC)
		nl_dump(p, "src %s ", nl_addr2str(r->rt_src, buf, sizeof(buf)));

	nl_dump(p, "\n");

	if (r->ce_mask & ROUTE_ATTR_MULTIPATH) {
		struct rtnl_nexthop *nh;

		nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) {
			nl_dump_line(p, "    ");
			p->dp_ivar = NH_DUMP_FROM_DETAILS;
			rtnl_route_nh_dump(nh, p);
			nl_dump(p, "\n");
		}
	}

	if ((r->ce_mask & ROUTE_ATTR_CACHEINFO) && r->rt_cacheinfo.rtci_error) {
		nl_dump_line(p, "    cacheinfo error %d (%s)\n",
			r->rt_cacheinfo.rtci_error,
			strerror(-r->rt_cacheinfo.rtci_error));
	}

	if (r->ce_mask & ROUTE_ATTR_METRICS) {
		nl_dump_line(p, "    metrics [");
		for (i = 0; i < RTAX_MAX; i++)
			if (r->rt_metrics_mask & (1 << i))
				nl_dump(p, "%s %u ",
					rtnl_route_metric2str(i+1,
							      buf, sizeof(buf)),
					r->rt_metrics[i]);
		nl_dump(p, "]\n");
	}

	if (link_cache)
		nl_cache_put(link_cache);
}

static void route_dump_stats(struct nl_object *obj, struct nl_dump_params *p)
{
	struct rtnl_route *route = (struct rtnl_route *) obj;

	route_dump_details(obj, p);

	if (route->ce_mask & ROUTE_ATTR_CACHEINFO) {
		struct rtnl_rtcacheinfo *ci = &route->rt_cacheinfo;

		nl_dump_line(p, "    used %u refcnt %u last-use %us "
				"expires %us\n",
			     ci->rtci_used, ci->rtci_clntref,
			     ci->rtci_last_use / nl_get_user_hz(),
			     ci->rtci_expires / nl_get_user_hz());
	}
}

static void route_keygen(struct nl_object *obj, uint32_t *hashkey,
			  uint32_t table_sz)
{
	struct rtnl_route *route = (struct rtnl_route *) obj;
	unsigned int rkey_sz;
	struct nl_addr *addr = NULL;
	struct route_hash_key {
		uint8_t		rt_family;
		uint8_t		rt_tos;
		uint32_t	rt_table;
		uint32_t	rt_prio;
		char 		rt_addr[0];
	} __attribute__((packed)) *rkey;
	char buf[INET6_ADDRSTRLEN+5];

	if (route->rt_dst)
		addr = route->rt_dst;

	rkey_sz = sizeof(*rkey);
	if (addr)
		rkey_sz += nl_addr_get_len(addr);
	rkey = calloc(1, rkey_sz);
	if (!rkey) {
		NL_DBG(2, "Warning: calloc failed for %d bytes...\n", rkey_sz);
		*hashkey = 0;
		return;
	}
	rkey->rt_family = route->rt_family;
	rkey->rt_tos = route->rt_tos;
	rkey->rt_table = route->rt_table;
	rkey->rt_prio = route->rt_prio;
	if (addr)
		memcpy(rkey->rt_addr, nl_addr_get_binary_addr(addr),
			nl_addr_get_len(addr));

	*hashkey = nl_hash(rkey, rkey_sz, 0) % table_sz;

	NL_DBG(5, "route %p key (fam %d tos %d table %d addr %s) keysz %d "
		"hash 0x%x\n", route, rkey->rt_family, rkey->rt_tos,
		rkey->rt_table, nl_addr2str(addr, buf, sizeof(buf)),
		rkey_sz, *hashkey);

	free(rkey);

	return;
}

static int route_compare(struct nl_object *_a, struct nl_object *_b,
			uint32_t attrs, int flags)
{
	struct rtnl_route *a = (struct rtnl_route *) _a;
	struct rtnl_route *b = (struct rtnl_route *) _b;
	struct rtnl_nexthop *nh_a, *nh_b;
	int i, diff = 0, found;

#define ROUTE_DIFF(ATTR, EXPR) ATTR_DIFF(attrs, ROUTE_ATTR_##ATTR, a, b, EXPR)

	diff |= ROUTE_DIFF(FAMILY,	a->rt_family != b->rt_family);
	diff |= ROUTE_DIFF(TOS,		a->rt_tos != b->rt_tos);
	diff |= ROUTE_DIFF(TABLE,	a->rt_table != b->rt_table);
	diff |= ROUTE_DIFF(PROTOCOL,	a->rt_protocol != b->rt_protocol);
	diff |= ROUTE_DIFF(SCOPE,	a->rt_scope != b->rt_scope);
	diff |= ROUTE_DIFF(TYPE,	a->rt_type != b->rt_type);
	diff |= ROUTE_DIFF(PRIO,	a->rt_prio != b->rt_prio);
	diff |= ROUTE_DIFF(DST,		nl_addr_cmp(a->rt_dst, b->rt_dst));
	diff |= ROUTE_DIFF(SRC,		nl_addr_cmp(a->rt_src, b->rt_src));
	diff |= ROUTE_DIFF(IIF,		a->rt_iif != b->rt_iif);
	diff |= ROUTE_DIFF(PREF_SRC,	nl_addr_cmp(a->rt_pref_src,
						    b->rt_pref_src));

	if (flags & LOOSE_COMPARISON) {
		nl_list_for_each_entry(nh_b, &b->rt_nexthops, rtnh_list) {
			found = 0;
			nl_list_for_each_entry(nh_a, &a->rt_nexthops,
					       rtnh_list) {
				if (!rtnl_route_nh_compare(nh_a, nh_b,
							nh_b->ce_mask, 1)) {
					found = 1;
					break;
				}
			}

			if (!found)
				goto nh_mismatch;
		}

		for (i = 0; i < RTAX_MAX - 1; i++) {
			if (a->rt_metrics_mask & (1 << i) &&
			    (!(b->rt_metrics_mask & (1 << i)) ||
			     a->rt_metrics[i] != b->rt_metrics[i]))
				diff |= ROUTE_DIFF(METRICS, 1);
		}

		diff |= ROUTE_DIFF(FLAGS,
			  (a->rt_flags ^ b->rt_flags) & b->rt_flag_mask);
	} else {
		if (a->rt_nr_nh != b->rt_nr_nh)
			goto nh_mismatch;

		/* search for a dup in each nh of a */
		nl_list_for_each_entry(nh_a, &a->rt_nexthops, rtnh_list) {
			found = 0;
			nl_list_for_each_entry(nh_b, &b->rt_nexthops,
					       rtnh_list) {
				if (!rtnl_route_nh_compare(nh_a, nh_b, ~0, 0)) {
					found = 1;
					break;
				}
			}
			if (!found)
				goto nh_mismatch;
		}

		/* search for a dup in each nh of b, covers case where a has
		 * dupes itself */
		nl_list_for_each_entry(nh_b, &b->rt_nexthops, rtnh_list) {
			found = 0;
			nl_list_for_each_entry(nh_a, &a->rt_nexthops,
					       rtnh_list) {
				if (!rtnl_route_nh_compare(nh_a, nh_b, ~0, 0)) {
					found = 1;
					break;
				}
			}
			if (!found)
				goto nh_mismatch;
		}

		for (i = 0; i < RTAX_MAX - 1; i++) {
			if ((a->rt_metrics_mask & (1 << i)) ^
			    (b->rt_metrics_mask & (1 << i)))
				diff |= ROUTE_DIFF(METRICS, 1);
			else
				diff |= ROUTE_DIFF(METRICS,
					a->rt_metrics[i] != b->rt_metrics[i]);
		}

		diff |= ROUTE_DIFF(FLAGS, a->rt_flags != b->rt_flags);
	}

out:
	return diff;

nh_mismatch:
	diff |= ROUTE_DIFF(MULTIPATH, 1);
	goto out;

#undef ROUTE_DIFF
}

static int route_update(struct nl_object *old_obj, struct nl_object *new_obj)
{
	struct rtnl_route *new_route = (struct rtnl_route *) new_obj;
	struct rtnl_route *old_route = (struct rtnl_route *) old_obj;
	struct rtnl_nexthop *new_nh;
	char buf[INET6_ADDRSTRLEN+5];
	int action = new_obj->ce_msgtype;

	/*
	 * ipv6 ECMP route notifications from the kernel come as
	 * separate notifications, one for every nexthop. This update
	 * function collapses such route msgs into a single
	 * route with multiple nexthops. The resulting object looks
	 * similar to a ipv4 ECMP route
	 */
	if (new_route->rt_family != AF_INET6 ||
	    new_route->rt_table == RT_TABLE_LOCAL)
		return -NLE_OPNOTSUPP;

	/*
	 * For routes that are already multipath,
	 * or dont have a nexthop dont do anything
	 */
	if (rtnl_route_get_nnexthops(new_route) != 1)
		return -NLE_OPNOTSUPP;

	/*
	 * Get the only nexthop entry from the new route. For
	 * IPv6 we always get a route with a 0th NH
	 * filled or nothing at all
	 */
	new_nh = rtnl_route_nexthop_n(new_route, 0);
	if (!new_nh || !rtnl_route_nh_get_gateway(new_nh))
		return -NLE_OPNOTSUPP;

	switch(action) {
	case RTM_NEWROUTE : {
		struct rtnl_nexthop *cloned_nh;

		/*
		 * Add the nexthop to old route
		 */
		cloned_nh = rtnl_route_nh_clone(new_nh);
		if (!cloned_nh)
			return -NLE_NOMEM;
		rtnl_route_add_nexthop(old_route, cloned_nh);

		NL_DBG(2, "Route obj %p updated. Added "
			"nexthop %p via %s\n", old_route, cloned_nh,
			nl_addr2str(cloned_nh->rtnh_gateway, buf,
					sizeof(buf)));
	}
		break;
	case RTM_DELROUTE : {
		struct rtnl_nexthop *old_nh;

		/*
		 * Only take care of nexthop deletes and not
		 * route deletes. So, if there is only one nexthop
		 * quite likely we did not update it. So dont do
		 * anything and return
		 */
		if (rtnl_route_get_nnexthops(old_route) <= 1)
			return -NLE_OPNOTSUPP;

		/*
		 * Find the next hop in old route and delete it
		 */
		nl_list_for_each_entry(old_nh, &old_route->rt_nexthops,
			rtnh_list) {
			if (!rtnl_route_nh_compare(old_nh, new_nh, ~0, 0)) {

				rtnl_route_remove_nexthop(old_route, old_nh);

				NL_DBG(2, "Route obj %p updated. Removed "
					"nexthop %p via %s\n", old_route,
					old_nh,
					nl_addr2str(old_nh->rtnh_gateway, buf,
					sizeof(buf)));

				rtnl_route_nh_free(old_nh);
				break;
			}
		}
	}
		break;
	default:
		NL_DBG(2, "Unknown action associated "
			"to object %p during route update\n", new_obj);
		return -NLE_OPNOTSUPP;
	}

	return NLE_SUCCESS;
}

static const struct trans_tbl route_attrs[] = {
	__ADD(ROUTE_ATTR_FAMILY, family)
	__ADD(ROUTE_ATTR_TOS, tos)
	__ADD(ROUTE_ATTR_TABLE, table)
	__ADD(ROUTE_ATTR_PROTOCOL, protocol)
	__ADD(ROUTE_ATTR_SCOPE, scope)
	__ADD(ROUTE_ATTR_TYPE, type)
	__ADD(ROUTE_ATTR_FLAGS, flags)
	__ADD(ROUTE_ATTR_DST, dst)
	__ADD(ROUTE_ATTR_SRC, src)
	__ADD(ROUTE_ATTR_IIF, iif)
	__ADD(ROUTE_ATTR_OIF, oif)
	__ADD(ROUTE_ATTR_GATEWAY, gateway)
	__ADD(ROUTE_ATTR_PRIO, prio)
	__ADD(ROUTE_ATTR_PREF_SRC, pref_src)
	__ADD(ROUTE_ATTR_METRICS, metrics)
	__ADD(ROUTE_ATTR_MULTIPATH, multipath)
	__ADD(ROUTE_ATTR_REALMS, realms)
	__ADD(ROUTE_ATTR_CACHEINFO, cacheinfo)
};

static char *route_attrs2str(int attrs, char *buf, size_t len)
{
	return __flags2str(attrs, buf, len, route_attrs,
			   ARRAY_SIZE(route_attrs));
}

/**
 * @name Allocation/Freeing
 * @{
 */

struct rtnl_route *rtnl_route_alloc(void)
{
	return (struct rtnl_route *) nl_object_alloc(&route_obj_ops);
}

void rtnl_route_get(struct rtnl_route *route)
{
	nl_object_get((struct nl_object *) route);
}

void rtnl_route_put(struct rtnl_route *route)
{
	nl_object_put((struct nl_object *) route);
}

/** @} */

/**
 * @name Attributes
 * @{
 */

void rtnl_route_set_table(struct rtnl_route *route, uint32_t table)
{
	route->rt_table = table;
	route->ce_mask |= ROUTE_ATTR_TABLE;
}

uint32_t rtnl_route_get_table(struct rtnl_route *route)
{
	return route->rt_table;
}

void rtnl_route_set_scope(struct rtnl_route *route, uint8_t scope)
{
	route->rt_scope = scope;
	route->ce_mask |= ROUTE_ATTR_SCOPE;
}

uint8_t rtnl_route_get_scope(struct rtnl_route *route)
{
	return route->rt_scope;
}

void rtnl_route_set_tos(struct rtnl_route *route, uint8_t tos)
{
	route->rt_tos = tos;
	route->ce_mask |= ROUTE_ATTR_TOS;
}

uint8_t rtnl_route_get_tos(struct rtnl_route *route)
{
	return route->rt_tos;
}

void rtnl_route_set_protocol(struct rtnl_route *route, uint8_t protocol)
{
	route->rt_protocol = protocol;
	route->ce_mask |= ROUTE_ATTR_PROTOCOL;
}

uint8_t rtnl_route_get_protocol(struct rtnl_route *route)
{
	return route->rt_protocol;
}

void rtnl_route_set_priority(struct rtnl_route *route, uint32_t prio)
{
	route->rt_prio = prio;
	route->ce_mask |= ROUTE_ATTR_PRIO;
}

uint32_t rtnl_route_get_priority(struct rtnl_route *route)
{
	return route->rt_prio;
}

int rtnl_route_set_family(struct rtnl_route *route, uint8_t family)
{
	if (family != AF_INET && family != AF_INET6 && family != AF_DECnet)
		return -NLE_AF_NOSUPPORT;

	route->rt_family = family;
	route->ce_mask |= ROUTE_ATTR_FAMILY;

	return 0;
}

uint8_t rtnl_route_get_family(struct rtnl_route *route)
{
	return route->rt_family;
}

int rtnl_route_set_dst(struct rtnl_route *route, struct nl_addr *addr)
{
	if (route->ce_mask & ROUTE_ATTR_FAMILY) {
		if (addr->a_family != route->rt_family)
			return -NLE_AF_MISMATCH;
	} else
		route->rt_family = addr->a_family;

	if (route->rt_dst)
		nl_addr_put(route->rt_dst);

	nl_addr_get(addr);
	route->rt_dst = addr;
	
	route->ce_mask |= (ROUTE_ATTR_DST | ROUTE_ATTR_FAMILY);

	return 0;
}

struct nl_addr *rtnl_route_get_dst(struct rtnl_route *route)
{
	return route->rt_dst;
}

int rtnl_route_set_src(struct rtnl_route *route, struct nl_addr *addr)
{
	if (addr->a_family == AF_INET)
		return -NLE_SRCRT_NOSUPPORT;

	if (route->ce_mask & ROUTE_ATTR_FAMILY) {
		if (addr->a_family != route->rt_family)
			return -NLE_AF_MISMATCH;
	} else
		route->rt_family = addr->a_family;

	if (route->rt_src)
		nl_addr_put(route->rt_src);

	nl_addr_get(addr);
	route->rt_src = addr;
	route->ce_mask |= (ROUTE_ATTR_SRC | ROUTE_ATTR_FAMILY);

	return 0;
}

struct nl_addr *rtnl_route_get_src(struct rtnl_route *route)
{
	return route->rt_src;
}

int rtnl_route_set_type(struct rtnl_route *route, uint8_t type)
{
	if (type > RTN_MAX)
		return -NLE_RANGE;

	route->rt_type = type;
	route->ce_mask |= ROUTE_ATTR_TYPE;

	return 0;
}

uint8_t rtnl_route_get_type(struct rtnl_route *route)
{
	return route->rt_type;
}

void rtnl_route_set_flags(struct rtnl_route *route, uint32_t flags)
{
	route->rt_flag_mask |= flags;
	route->rt_flags |= flags;
	route->ce_mask |= ROUTE_ATTR_FLAGS;
}

void rtnl_route_unset_flags(struct rtnl_route *route, uint32_t flags)
{
	route->rt_flag_mask |= flags;
	route->rt_flags &= ~flags;
	route->ce_mask |= ROUTE_ATTR_FLAGS;
}

uint32_t rtnl_route_get_flags(struct rtnl_route *route)
{
	return route->rt_flags;
}

int rtnl_route_set_metric(struct rtnl_route *route, int metric, uint32_t value)
{
	if (metric > RTAX_MAX || metric < 1)
		return -NLE_RANGE;

	route->rt_metrics[metric - 1] = value;

	if (!(route->rt_metrics_mask & (1 << (metric - 1)))) {
		route->rt_nmetrics++;
		route->rt_metrics_mask |= (1 << (metric - 1));
	}

	route->ce_mask |= ROUTE_ATTR_METRICS;

	return 0;
}

int rtnl_route_unset_metric(struct rtnl_route *route, int metric)
{
	if (metric > RTAX_MAX || metric < 1)
		return -NLE_RANGE;

	if (route->rt_metrics_mask & (1 << (metric - 1))) {
		route->rt_nmetrics--;
		route->rt_metrics_mask &= ~(1 << (metric - 1));
	}

	return 0;
}

int rtnl_route_get_metric(struct rtnl_route *route, int metric, uint32_t *value)
{
	if (metric > RTAX_MAX || metric < 1)
		return -NLE_RANGE;

	if (!(route->rt_metrics_mask & (1 << (metric - 1))))
		return -NLE_OBJ_NOTFOUND;

	if (value)
		*value = route->rt_metrics[metric - 1];

	return 0;
}

int rtnl_route_set_pref_src(struct rtnl_route *route, struct nl_addr *addr)
{
	if (route->ce_mask & ROUTE_ATTR_FAMILY) {
		if (addr->a_family != route->rt_family)
			return -NLE_AF_MISMATCH;
	} else
		route->rt_family = addr->a_family;

	if (route->rt_pref_src)
		nl_addr_put(route->rt_pref_src);

	nl_addr_get(addr);
	route->rt_pref_src = addr;
	route->ce_mask |= (ROUTE_ATTR_PREF_SRC | ROUTE_ATTR_FAMILY);

	return 0;
}

struct nl_addr *rtnl_route_get_pref_src(struct rtnl_route *route)
{
	return route->rt_pref_src;
}

void rtnl_route_set_iif(struct rtnl_route *route, int ifindex)
{
	route->rt_iif = ifindex;
	route->ce_mask |= ROUTE_ATTR_IIF;
}

int rtnl_route_get_iif(struct rtnl_route *route)
{
	return route->rt_iif;
}

void rtnl_route_add_nexthop(struct rtnl_route *route, struct rtnl_nexthop *nh)
{
	nl_list_add_tail(&nh->rtnh_list, &route->rt_nexthops);
	route->rt_nr_nh++;
	route->ce_mask |= ROUTE_ATTR_MULTIPATH;
}

void rtnl_route_remove_nexthop(struct rtnl_route *route, struct rtnl_nexthop *nh)
{
	if (route->ce_mask & ROUTE_ATTR_MULTIPATH) {
		route->rt_nr_nh--;
		nl_list_del(&nh->rtnh_list);
	}
}

struct nl_list_head *rtnl_route_get_nexthops(struct rtnl_route *route)
{
	if (route->ce_mask & ROUTE_ATTR_MULTIPATH)
		return &route->rt_nexthops;

	return NULL;
}

int rtnl_route_get_nnexthops(struct rtnl_route *route)
{
	if (route->ce_mask & ROUTE_ATTR_MULTIPATH)
		return route->rt_nr_nh;

	return 0;
}

void rtnl_route_foreach_nexthop(struct rtnl_route *r,
                                void (*cb)(struct rtnl_nexthop *, void *),
                                void *arg)
{
	struct rtnl_nexthop *nh;
    
	if (r->ce_mask & ROUTE_ATTR_MULTIPATH) {
		nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) {
                        cb(nh, arg);
		}
	}
}

struct rtnl_nexthop *rtnl_route_nexthop_n(struct rtnl_route *r, int n)
{
	struct rtnl_nexthop *nh;
	uint32_t i;
    
	if (r->ce_mask & ROUTE_ATTR_MULTIPATH && r->rt_nr_nh > n) {
		i = 0;
		nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) {
                        if (i == n) return nh;
			i++;
		}
	}
        return NULL;
}

/** @} */

/**
 * @name Utilities
 * @{
 */

/**
 * Guess scope of a route object.
 * @arg route		Route object.
 *
 * Guesses the scope of a route object, based on the following rules:
 * @code
 *   1) Local route -> local scope
 *   2) At least one nexthop not directly connected -> universe scope
 *   3) All others -> link scope
 * @endcode
 *
 * @return Scope value.
 */
int rtnl_route_guess_scope(struct rtnl_route *route)
{
	if (route->rt_type == RTN_LOCAL)
		return RT_SCOPE_HOST;

	if (!nl_list_empty(&route->rt_nexthops)) {
		struct rtnl_nexthop *nh;

		/*
		 * Use scope uiniverse if there is at least one nexthop which
		 * is not directly connected
		 */
		nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) {
			if (nh->rtnh_gateway)
				return RT_SCOPE_UNIVERSE;
		}
	}

	return RT_SCOPE_LINK;
}

/** @} */

static struct nla_policy route_policy[RTA_MAX+1] = {
	[RTA_IIF]	= { .type = NLA_U32 },
	[RTA_OIF]	= { .type = NLA_U32 },
	[RTA_PRIORITY]	= { .type = NLA_U32 },
	[RTA_FLOW]	= { .type = NLA_U32 },
	[RTA_CACHEINFO]	= { .minlen = sizeof(struct rta_cacheinfo) },
	[RTA_METRICS]	= { .type = NLA_NESTED },
	[RTA_MULTIPATH]	= { .type = NLA_NESTED },
};

static int parse_multipath(struct rtnl_route *route, struct nlattr *attr)
{
	struct rtnl_nexthop *nh = NULL;
	struct rtnexthop *rtnh = nla_data(attr);
	size_t tlen = nla_len(attr);
	int err;

	while (tlen >= sizeof(*rtnh) && tlen >= rtnh->rtnh_len) {
		nh = rtnl_route_nh_alloc();
		if (!nh)
			return -NLE_NOMEM;

		rtnl_route_nh_set_weight(nh, rtnh->rtnh_hops);
		rtnl_route_nh_set_ifindex(nh, rtnh->rtnh_ifindex);
		rtnl_route_nh_set_flags(nh, rtnh->rtnh_flags);

		if (rtnh->rtnh_len > sizeof(*rtnh)) {
			struct nlattr *ntb[RTA_MAX + 1];

			err = nla_parse(ntb, RTA_MAX, (struct nlattr *)
					RTNH_DATA(rtnh),
					rtnh->rtnh_len - sizeof(*rtnh),
					route_policy);
			if (err < 0)
				goto errout;

			if (ntb[RTA_GATEWAY]) {
				struct nl_addr *addr;

				addr = nl_addr_alloc_attr(ntb[RTA_GATEWAY],
							  route->rt_family);
				if (!addr) {
					err = -NLE_NOMEM;
					goto errout;
				}

				rtnl_route_nh_set_gateway(nh, addr);
				nl_addr_put(addr);
			}

			if (ntb[RTA_FLOW]) {
				uint32_t realms;
				
				realms = nla_get_u32(ntb[RTA_FLOW]);
				rtnl_route_nh_set_realms(nh, realms);
			}
		}

		rtnl_route_add_nexthop(route, nh);
		tlen -= RTNH_ALIGN(rtnh->rtnh_len);
		rtnh = RTNH_NEXT(rtnh);
	}

	err = 0;
errout:
	if (err && nh)
		rtnl_route_nh_free(nh);

	return err;
}

int rtnl_route_parse(struct nlmsghdr *nlh, struct rtnl_route **result)
{
	struct rtmsg *rtm;
	struct rtnl_route *route;
	struct nlattr *tb[RTA_MAX + 1];
	struct nl_addr *src = NULL, *dst = NULL, *addr;
	struct rtnl_nexthop *old_nh = NULL;
	int err, family;

	route = rtnl_route_alloc();
	if (!route) {
		err = -NLE_NOMEM;
		goto errout;
	}

	route->ce_msgtype = nlh->nlmsg_type;

	err = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, RTA_MAX, route_policy);
	if (err < 0)
		goto errout;

	rtm = nlmsg_data(nlh);
	route->rt_family = family = rtm->rtm_family;
	route->rt_tos = rtm->rtm_tos;
	route->rt_table = rtm->rtm_table;
	route->rt_type = rtm->rtm_type;
	route->rt_scope = rtm->rtm_scope;
	route->rt_protocol = rtm->rtm_protocol;
	route->rt_flags = rtm->rtm_flags;
	route->rt_prio = 0;

	route->ce_mask |= ROUTE_ATTR_FAMILY | ROUTE_ATTR_TOS |
			  ROUTE_ATTR_TABLE | ROUTE_ATTR_TYPE |
			  ROUTE_ATTR_SCOPE | ROUTE_ATTR_PROTOCOL |
			  ROUTE_ATTR_FLAGS | ROUTE_ATTR_PRIO;

	if (tb[RTA_DST]) {
		if (!(dst = nl_addr_alloc_attr(tb[RTA_DST], family)))
			goto errout_nomem;
	} else {
		if (!(dst = nl_addr_alloc(0)))
			goto errout_nomem;
		nl_addr_set_family(dst, rtm->rtm_family);
	}

	nl_addr_set_prefixlen(dst, rtm->rtm_dst_len);
	err = rtnl_route_set_dst(route, dst);
	if (err < 0)
		goto errout;

	nl_addr_put(dst);

	if (tb[RTA_SRC]) {
		if (!(src = nl_addr_alloc_attr(tb[RTA_SRC], family)))
			goto errout_nomem;
	} else if (rtm->rtm_src_len)
		if (!(src = nl_addr_alloc(0)))
			goto errout_nomem;

	if (src) {
		nl_addr_set_prefixlen(src, rtm->rtm_src_len);
		rtnl_route_set_src(route, src);
		nl_addr_put(src);
	}

	if (tb[RTA_TABLE])
		rtnl_route_set_table(route, nla_get_u32(tb[RTA_TABLE]));

	if (tb[RTA_IIF])
		rtnl_route_set_iif(route, nla_get_u32(tb[RTA_IIF]));

	if (tb[RTA_PRIORITY])
		rtnl_route_set_priority(route, nla_get_u32(tb[RTA_PRIORITY]));

	if (tb[RTA_PREFSRC]) {
		if (!(addr = nl_addr_alloc_attr(tb[RTA_PREFSRC], family)))
			goto errout_nomem;
		rtnl_route_set_pref_src(route, addr);
		nl_addr_put(addr);
	}

	if (tb[RTA_METRICS]) {
		struct nlattr *mtb[RTAX_MAX + 1];
		int i;

		err = nla_parse_nested(mtb, RTAX_MAX, tb[RTA_METRICS], NULL);
		if (err < 0)
			goto errout;

		for (i = 1; i <= RTAX_MAX; i++) {
			if (mtb[i] && nla_len(mtb[i]) >= sizeof(uint32_t)) {
				uint32_t m = nla_get_u32(mtb[i]);
				if (rtnl_route_set_metric(route, i, m) < 0)
					goto errout;
			}
		}
	}

	if (tb[RTA_MULTIPATH])
		if ((err = parse_multipath(route, tb[RTA_MULTIPATH])) < 0)
			goto errout;

	if (tb[RTA_CACHEINFO]) {
		nla_memcpy(&route->rt_cacheinfo, tb[RTA_CACHEINFO],
			   sizeof(route->rt_cacheinfo));
		route->ce_mask |= ROUTE_ATTR_CACHEINFO;
	}

	if (tb[RTA_OIF]) {
		if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
			goto errout;

		rtnl_route_nh_set_ifindex(old_nh, nla_get_u32(tb[RTA_OIF]));
	}

	if (tb[RTA_GATEWAY]) {
		if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
			goto errout;

		if (!(addr = nl_addr_alloc_attr(tb[RTA_GATEWAY], family)))
			goto errout_nomem;

		rtnl_route_nh_set_gateway(old_nh, addr);
		nl_addr_put(addr);
	}

	if (tb[RTA_FLOW]) {
		if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
			goto errout;

		rtnl_route_nh_set_realms(old_nh, nla_get_u32(tb[RTA_FLOW]));
	}

	if (old_nh) {
		rtnl_route_nh_set_flags(old_nh, rtm->rtm_flags & 0xff);
		if (route->rt_nr_nh == 0) {
			/* If no nexthops have been provided via RTA_MULTIPATH
			 * we add it as regular nexthop to maintain backwards
			 * compatibility */
			rtnl_route_add_nexthop(route, old_nh);
		} else {
			/* Kernel supports new style nexthop configuration,
			 * verify that it is a duplicate and discard nexthop. */
			struct rtnl_nexthop *first;

			first = nl_list_first_entry(&route->rt_nexthops,
						    struct rtnl_nexthop,
						    rtnh_list);
			if (!first)
				BUG();

			if (rtnl_route_nh_compare(old_nh, first,
						  old_nh->ce_mask, 0)) {
				err = -NLE_INVAL;
				goto errout;
			}

			rtnl_route_nh_free(old_nh);
		}
	}

	*result = route;
	return 0;

errout:
	rtnl_route_put(route);
	return err;

errout_nomem:
	err = -NLE_NOMEM;
	goto errout;
}

int rtnl_route_build_msg(struct nl_msg *msg, struct rtnl_route *route)
{
	int i;
	struct nlattr *metrics;
	struct rtmsg rtmsg = {
		.rtm_family = route->rt_family,
		.rtm_tos = route->rt_tos,
		.rtm_table = route->rt_table,
		.rtm_protocol = route->rt_protocol,
		.rtm_scope = route->rt_scope,
		.rtm_type = route->rt_type,
		.rtm_flags = route->rt_flags,
	};

	if (route->rt_dst == NULL)
		return -NLE_MISSING_ATTR;

	rtmsg.rtm_dst_len = nl_addr_get_prefixlen(route->rt_dst);
	if (route->rt_src)
		rtmsg.rtm_src_len = nl_addr_get_prefixlen(route->rt_src);

	if (rtmsg.rtm_scope == RT_SCOPE_NOWHERE)
		rtmsg.rtm_scope = rtnl_route_guess_scope(route);

	if (rtnl_route_get_nnexthops(route) == 1) {
		struct rtnl_nexthop *nh;
		nh = rtnl_route_nexthop_n(route, 0);
		rtmsg.rtm_flags |= nh->rtnh_flags;
	}

	if (nlmsg_append(msg, &rtmsg, sizeof(rtmsg), NLMSG_ALIGNTO) < 0)
		goto nla_put_failure;

	/* Additional table attribute replacing the 8bit in the header, was
	 * required to allow more than 256 tables. */
	NLA_PUT_U32(msg, RTA_TABLE, route->rt_table);

	if (nl_addr_get_len(route->rt_dst))
		NLA_PUT_ADDR(msg, RTA_DST, route->rt_dst);
	NLA_PUT_U32(msg, RTA_PRIORITY, route->rt_prio);

	if (route->ce_mask & ROUTE_ATTR_SRC)
		NLA_PUT_ADDR(msg, RTA_SRC, route->rt_src);

	if (route->ce_mask & ROUTE_ATTR_PREF_SRC)
		NLA_PUT_ADDR(msg, RTA_PREFSRC, route->rt_pref_src);

	if (route->ce_mask & ROUTE_ATTR_IIF)
		NLA_PUT_U32(msg, RTA_IIF, route->rt_iif);

	if (route->rt_nmetrics > 0) {
		uint32_t val;

		metrics = nla_nest_start(msg, RTA_METRICS);
		if (metrics == NULL)
			goto nla_put_failure;

		for (i = 1; i <= RTAX_MAX; i++) {
			if (!rtnl_route_get_metric(route, i, &val))
				NLA_PUT_U32(msg, i, val);
		}

		nla_nest_end(msg, metrics);
	}

	if (rtnl_route_get_nnexthops(route) == 1) {
		struct rtnl_nexthop *nh;

		nh = rtnl_route_nexthop_n(route, 0);
		if (nh->rtnh_gateway)
			NLA_PUT_ADDR(msg, RTA_GATEWAY, nh->rtnh_gateway);
		if (nh->rtnh_ifindex)
			NLA_PUT_U32(msg, RTA_OIF, nh->rtnh_ifindex);
		if (nh->rtnh_realms)
			NLA_PUT_U32(msg, RTA_FLOW, nh->rtnh_realms);
	} else if (rtnl_route_get_nnexthops(route) > 1) {
		struct nlattr *multipath;
		struct rtnl_nexthop *nh;

		if (!(multipath = nla_nest_start(msg, RTA_MULTIPATH)))
			goto nla_put_failure;

		nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) {
			struct rtnexthop *rtnh;

			rtnh = nlmsg_reserve(msg, sizeof(*rtnh), NLMSG_ALIGNTO);
			if (!rtnh)
				goto nla_put_failure;

			rtnh->rtnh_flags = nh->rtnh_flags;
			rtnh->rtnh_hops = nh->rtnh_weight;
			rtnh->rtnh_ifindex = nh->rtnh_ifindex;

			if (nh->rtnh_gateway)
				NLA_PUT_ADDR(msg, RTA_GATEWAY,
					     nh->rtnh_gateway);

			if (nh->rtnh_realms)
				NLA_PUT_U32(msg, RTA_FLOW, nh->rtnh_realms);

			rtnh->rtnh_len = nlmsg_tail(msg->nm_nlh) -
						(void *) rtnh;
		}

		nla_nest_end(msg, multipath);
	}

	return 0;

nla_put_failure:
	return -NLE_MSGSIZE;
}

/** @cond SKIP */
struct nl_object_ops route_obj_ops = {
	.oo_name		= "route/route",
	.oo_size		= sizeof(struct rtnl_route),
	.oo_constructor		= route_constructor,
	.oo_free_data		= route_free_data,
	.oo_clone		= route_clone,
	.oo_dump = {
	    [NL_DUMP_LINE]	= route_dump_line,
	    [NL_DUMP_DETAILS]	= route_dump_details,
	    [NL_DUMP_STATS]	= route_dump_stats,
	},
	.oo_compare		= route_compare,
	.oo_keygen		= route_keygen,
	.oo_update		= route_update,
	.oo_attrs2str		= route_attrs2str,
	.oo_id_attrs		= (ROUTE_ATTR_FAMILY | ROUTE_ATTR_TOS |
				   ROUTE_ATTR_TABLE | ROUTE_ATTR_DST |
				   ROUTE_ATTR_PRIO),
};
/** @endcond */

/** @} */