libnl: /data/src/libnl3/lib/route/route_obj.c Source File

libnl 3.10.0

route_obj.c
1/* SPDX-License-Identifier: LGPL-2.1-only */
2/*
3 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
4 */
5
6/**
7 * @ingroup route
8 * @defgroup route_obj Route Object
9 *
10 * @par Attributes
11 * @code
12 * Name Default
13 * -------------------------------------------------------------
14 * routing table RT_TABLE_MAIN
15 * scope RT_SCOPE_NOWHERE
16 * tos 0
17 * protocol RTPROT_STATIC
18 * prio 0
19 * family AF_UNSPEC
20 * type RTN_UNICAST
21 * iif NULL
22 * @endcode
23 *
24 * @{
25 */
26
27#include "nl-default.h"
28
29#include <linux/in_route.h>
30
31#include <netlink/netlink.h>
32#include <netlink/cache.h>
33#include <netlink/utils.h>
34#include <netlink/data.h>
35#include <netlink/hashtable.h>
36#include <netlink/route/rtnl.h>
37#include <netlink/route/route.h>
38#include <netlink/route/link.h>
39#include <netlink/route/nexthop.h>
40
41#include "nl-route.h"
42#include "nl-aux-route/nl-route.h"
43#include "nl-priv-dynamic-core/nl-core.h"
44#include "nexthop-encap.h"
45
46/** @cond SKIP */
47struct rtnl_route {
48 NLHDR_COMMON
49
50 uint8_t rt_family;
51 uint8_t rt_tos;
52 uint8_t rt_protocol;
53 uint8_t rt_scope;
54 uint8_t rt_type;
55 uint8_t rt_nmetrics;
56 uint8_t rt_ttl_propagate;
57 uint32_t rt_flags;
58 struct nl_addr *rt_dst;
59 struct nl_addr *rt_src;
60 uint32_t rt_table;
61 uint32_t rt_iif;
62 uint32_t rt_prio;
63 uint32_t rt_metrics[RTAX_MAX];
64 uint32_t rt_metrics_mask;
65 uint32_t rt_nr_nh;
66 uint32_t rt_nhid;
67 struct nl_addr *rt_pref_src;
68 struct nl_list_head rt_nexthops;
69 struct rtnl_rtcacheinfo rt_cacheinfo;
70 uint32_t rt_flag_mask;
71};
72
73#define ROUTE_ATTR_FAMILY 0x000001
74#define ROUTE_ATTR_TOS 0x000002
75#define ROUTE_ATTR_TABLE 0x000004
76#define ROUTE_ATTR_PROTOCOL 0x000008
77#define ROUTE_ATTR_SCOPE 0x000010
78#define ROUTE_ATTR_TYPE 0x000020
79#define ROUTE_ATTR_FLAGS 0x000040
80#define ROUTE_ATTR_DST 0x000080
81#define ROUTE_ATTR_SRC 0x000100
82#define ROUTE_ATTR_IIF 0x000200
83#define ROUTE_ATTR_OIF 0x000400
84#define ROUTE_ATTR_GATEWAY 0x000800
85#define ROUTE_ATTR_PRIO 0x001000
86#define ROUTE_ATTR_PREF_SRC 0x002000
87#define ROUTE_ATTR_METRICS 0x004000
88#define ROUTE_ATTR_MULTIPATH 0x008000
89#define ROUTE_ATTR_REALMS 0x010000
90#define ROUTE_ATTR_CACHEINFO 0x020000
91#define ROUTE_ATTR_TTL_PROPAGATE 0x040000
92#define ROUTE_ATTR_NHID 0x080000
93/** @endcond */
94
95static void route_constructor(struct nl_object *c)
96{
97 struct rtnl_route *r = (struct rtnl_route *) c;
98
99 r->rt_family = AF_UNSPEC;
100 r->rt_scope = RT_SCOPE_NOWHERE;
101 r->rt_table = RT_TABLE_MAIN;
102 r->rt_protocol = RTPROT_STATIC;
103 r->rt_type = RTN_UNICAST;
104 r->rt_prio = 0;
105
106 nl_init_list_head(&r->rt_nexthops);
107}
108
109static void route_free_data(struct nl_object *c)
110{
111 struct rtnl_route *r = (struct rtnl_route *) c;
112 struct rtnl_nexthop *nh, *tmp;
113
114 if (r == NULL)
115 return;
116
117 nl_addr_put(r->rt_dst);
118 nl_addr_put(r->rt_src);
119 nl_addr_put(r->rt_pref_src);
120
121 nl_list_for_each_entry_safe(nh, tmp, &r->rt_nexthops, rtnh_list) {
122 rtnl_route_remove_nexthop(r, nh);
123 rtnl_route_nh_free(nh);
124 }
125}
126
127static int route_clone(struct nl_object *_dst, struct nl_object *_src)
128{
129 struct rtnl_route *dst = (struct rtnl_route *) _dst;
130 struct rtnl_route *src = (struct rtnl_route *) _src;
131 struct rtnl_nexthop *nh, *new;
132
133 dst->rt_dst = NULL;
134 dst->rt_src = NULL;
135 dst->rt_pref_src = NULL;
136 nl_init_list_head(&dst->rt_nexthops);
137 dst->rt_nr_nh = 0;
138
139 if (src->rt_dst) {
140 if (!(dst->rt_dst = nl_addr_clone(src->rt_dst)))
141 return -NLE_NOMEM;
142 }
143
144 if (src->rt_src) {
145 if (!(dst->rt_src = nl_addr_clone(src->rt_src)))
146 return -NLE_NOMEM;
147 }
148
149 if (src->rt_pref_src) {
150 if (!(dst->rt_pref_src = nl_addr_clone(src->rt_pref_src)))
151 return -NLE_NOMEM;
152 }
153
154 nl_list_for_each_entry(nh, &src->rt_nexthops, rtnh_list) {
155 new = rtnl_route_nh_clone(nh);
156 if (!new)
157 return -NLE_NOMEM;
158
159 rtnl_route_add_nexthop(dst, new);
160 }
161
162 return 0;
163}
164
165static void route_dump_line(struct nl_object *a, struct nl_dump_params *p)
166{
167 struct rtnl_route *r = (struct rtnl_route *) a;
168 int cache = 0, flags;
169 char buf[64];
170
171 if (r->rt_flags & RTM_F_CLONED)
172 cache = 1;
173
174 nl_dump_line(p, "%s ", nl_af2str(r->rt_family, buf, sizeof(buf)));
175
176 if (cache)
177 nl_dump(p, "cache ");
178
179 if (!(r->ce_mask & ROUTE_ATTR_DST) ||
180 (nl_addr_get_prefixlen(r->rt_dst) == 0 &&
181 nl_addr_get_len(r->rt_dst) > 0 && nl_addr_iszero(r->rt_dst)))
182 nl_dump(p, "default ");
183 else
184 nl_dump(p, "%s ", nl_addr2str(r->rt_dst, buf, sizeof(buf)));
185
186 if (r->ce_mask & ROUTE_ATTR_TABLE && !cache)
187 nl_dump(p, "table %s ",
188 rtnl_route_table2str(r->rt_table, buf, sizeof(buf)));
189
190 if (r->ce_mask & ROUTE_ATTR_TYPE)
191 nl_dump(p, "type %s ",
192 nl_rtntype2str(r->rt_type, buf, sizeof(buf)));
193
194 if (r->ce_mask & ROUTE_ATTR_TOS && r->rt_tos != 0)
195 nl_dump(p, "tos %#x ", r->rt_tos);
196
197 if (r->ce_mask & ROUTE_ATTR_NHID)
198 nl_dump(p, "nhid %u ", r->rt_nhid);
199
200 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) {
201 struct rtnl_nexthop *nh;
202
203 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) {
204 p->dp_ivar = NH_DUMP_FROM_ONELINE;
205 rtnl_route_nh_dump(nh, p);
206 }
207 }
208
209 flags = r->rt_flags & ~(RTM_F_CLONED);
210 if (r->ce_mask & ROUTE_ATTR_FLAGS && flags) {
211
212 nl_dump(p, "<");
213
214#define PRINT_FLAG(f) if (flags & RTNH_F_##f) { \
215 flags &= ~RTNH_F_##f; nl_dump(p, #f "%s", flags ? "," : ""); }
216 PRINT_FLAG(DEAD);
217 PRINT_FLAG(ONLINK);
218 PRINT_FLAG(PERVASIVE);
219#undef PRINT_FLAG
220
221#define PRINT_FLAG(f) if (flags & RTM_F_##f) { \
222 flags &= ~RTM_F_##f; nl_dump(p, #f "%s", flags ? "," : ""); }
223 PRINT_FLAG(NOTIFY);
224 PRINT_FLAG(EQUALIZE);
225 PRINT_FLAG(PREFIX);
226#undef PRINT_FLAG
227
228#define PRINT_FLAG(f) if (flags & RTCF_##f) { \
229 flags &= ~RTCF_##f; nl_dump(p, #f "%s", flags ? "," : ""); }
230 PRINT_FLAG(NOTIFY);
231 PRINT_FLAG(REDIRECTED);
232 PRINT_FLAG(DOREDIRECT);
233 PRINT_FLAG(DIRECTSRC);
234 PRINT_FLAG(DNAT);
235 PRINT_FLAG(BROADCAST);
236 PRINT_FLAG(MULTICAST);
237 PRINT_FLAG(LOCAL);
238#undef PRINT_FLAG
239
240 nl_dump(p, ">");
241 }
242
243 nl_dump(p, "\n");
244}
245
246static void route_dump_details(struct nl_object *a, struct nl_dump_params *p)
247{
248 _nl_auto_nl_cache struct nl_cache *link_cache = NULL;
249 struct rtnl_route *r = (struct rtnl_route *) a;
250 char buf[256];
251 int i;
252
253 link_cache = nl_cache_mngt_require_safe("route/link");
254
255 route_dump_line(a, p);
256 nl_dump_line(p, " ");
257
258 if (r->ce_mask & ROUTE_ATTR_PREF_SRC)
259 nl_dump(p, "preferred-src %s ",
260 nl_addr2str(r->rt_pref_src, buf, sizeof(buf)));
261
262 if (r->ce_mask & ROUTE_ATTR_SCOPE && r->rt_scope != RT_SCOPE_NOWHERE)
263 nl_dump(p, "scope %s ",
264 rtnl_scope2str(r->rt_scope, buf, sizeof(buf)));
265
266 if (r->ce_mask & ROUTE_ATTR_PRIO)
267 nl_dump(p, "priority %#x ", r->rt_prio);
268
269 if (r->ce_mask & ROUTE_ATTR_PROTOCOL)
270 nl_dump(p, "protocol %s ",
271 rtnl_route_proto2str(r->rt_protocol, buf, sizeof(buf)));
272
273 if (r->ce_mask & ROUTE_ATTR_IIF) {
274 if (link_cache) {
275 nl_dump(p, "iif %s ",
276 rtnl_link_i2name(link_cache, r->rt_iif,
277 buf, sizeof(buf)));
278 } else
279 nl_dump(p, "iif %d ", r->rt_iif);
280 }
281
282 if (r->ce_mask & ROUTE_ATTR_SRC)
283 nl_dump(p, "src %s ", nl_addr2str(r->rt_src, buf, sizeof(buf)));
284
285 if (r->ce_mask & ROUTE_ATTR_TTL_PROPAGATE) {
286 nl_dump(p, " ttl-propagate %s",
287 r->rt_ttl_propagate ? "enabled" : "disabled");
288 }
289
290 if (r->ce_mask & ROUTE_ATTR_NHID)
291 nl_dump(p, "nhid %u ", r->rt_nhid);
292
293 nl_dump(p, "\n");
294
295 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) {
296 struct rtnl_nexthop *nh;
297
298 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) {
299 nl_dump_line(p, " ");
300 p->dp_ivar = NH_DUMP_FROM_DETAILS;
301 rtnl_route_nh_dump(nh, p);
302 nl_dump(p, "\n");
303 }
304 }
305
306 if ((r->ce_mask & ROUTE_ATTR_CACHEINFO) && r->rt_cacheinfo.rtci_error) {
307 nl_dump_line(p, " cacheinfo error %d (%s)\n",
308 r->rt_cacheinfo.rtci_error,
309 nl_strerror_l(-r->rt_cacheinfo.rtci_error));
310 }
311
312 if (r->ce_mask & ROUTE_ATTR_METRICS) {
313 nl_dump_line(p, " metrics [");
314 for (i = 0; i < RTAX_MAX; i++)
315 if (r->rt_metrics_mask & (1 << i))
316 nl_dump(p, "%s %u ",
317 rtnl_route_metric2str(i+1,
318 buf, sizeof(buf)),
319 r->rt_metrics[i]);
320 nl_dump(p, "]\n");
321 }
322}
323
324static void route_dump_stats(struct nl_object *obj, struct nl_dump_params *p)
325{
326 struct rtnl_route *route = (struct rtnl_route *) obj;
327
328 route_dump_details(obj, p);
329
330 if (route->ce_mask & ROUTE_ATTR_CACHEINFO) {
331 struct rtnl_rtcacheinfo *ci = &route->rt_cacheinfo;
332
333 nl_dump_line(p, " used %u refcnt %u last-use %us "
334 "expires %us\n",
335 ci->rtci_used, ci->rtci_clntref,
336 ci->rtci_last_use / nl_get_user_hz(),
337 ci->rtci_expires / nl_get_user_hz());
338 }
339}
340
341static void route_keygen(struct nl_object *obj, uint32_t *hashkey,
342 uint32_t table_sz)
343{
344 struct rtnl_route *route = (struct rtnl_route *) obj;
345 unsigned int rkey_sz;
346 struct nl_addr *addr = NULL;
347 _nl_auto_free struct route_hash_key {
348 uint8_t rt_family;
349 uint8_t rt_tos;
350 uint32_t rt_table;
351 uint32_t rt_prio;
352 char rt_addr[0];
353 } _nl_packed *rkey = NULL;
354 char buf[INET6_ADDRSTRLEN+5];
355
356 if (route->rt_dst)
357 addr = route->rt_dst;
358
359 rkey_sz = sizeof(*rkey);
360 if (addr)
361 rkey_sz += nl_addr_get_len(addr);
362 rkey = calloc(1, rkey_sz);
363 if (!rkey) {
364 NL_DBG(2, "Warning: calloc failed for %d bytes...\n", rkey_sz);
365 *hashkey = 0;
366 return;
367 }
368 rkey->rt_family = route->rt_family;
369 rkey->rt_tos = route->rt_tos;
370 rkey->rt_table = route->rt_table;
371 rkey->rt_prio = route->rt_prio;
372 if (addr)
373 memcpy(rkey->rt_addr, nl_addr_get_binary_addr(addr),
374 nl_addr_get_len(addr));
375
376 *hashkey = nl_hash(rkey, rkey_sz, 0) % table_sz;
377
378 NL_DBG(5,
379 "route %p key (fam %d tos %d table %d prio %d addr %s) keysz %d hash 0x%x\n",
380 route, rkey->rt_family, rkey->rt_tos, rkey->rt_table,
381 rkey->rt_prio, nl_addr2str(addr, buf, sizeof(buf)), rkey_sz,
382 *hashkey);
383
384 return;
385}
386
387static uint32_t route_id_attrs_get(struct nl_object *obj)
388{
389 struct rtnl_route *route = (struct rtnl_route *)obj;
390 struct nl_object_ops *ops = obj->ce_ops;
391 uint32_t rv = ops->oo_id_attrs;
392
393 /* MPLS address family does not allow RTA_PRIORITY to be set */
394 if (route->rt_family == AF_MPLS)
395 rv &= ~ROUTE_ATTR_PRIO;
396
397 return rv;
398}
399
400static uint64_t route_compare(struct nl_object *_a, struct nl_object *_b,
401 uint64_t attrs, int flags)
402{
403 struct rtnl_route *a = (struct rtnl_route *) _a;
404 struct rtnl_route *b = (struct rtnl_route *) _b;
405 struct rtnl_nexthop *nh_a, *nh_b;
406 int i, found;
407 uint64_t diff = 0;
408
409#define _DIFF(ATTR, EXPR) ATTR_DIFF(attrs, ATTR, a, b, EXPR)
410 diff |= _DIFF(ROUTE_ATTR_FAMILY, a->rt_family != b->rt_family);
411 diff |= _DIFF(ROUTE_ATTR_TOS, a->rt_tos != b->rt_tos);
412 diff |= _DIFF(ROUTE_ATTR_TABLE, a->rt_table != b->rt_table);
413 diff |= _DIFF(ROUTE_ATTR_PROTOCOL, a->rt_protocol != b->rt_protocol);
414 diff |= _DIFF(ROUTE_ATTR_SCOPE, a->rt_scope != b->rt_scope);
415 diff |= _DIFF(ROUTE_ATTR_TYPE, a->rt_type != b->rt_type);
416 diff |= _DIFF(ROUTE_ATTR_PRIO, a->rt_prio != b->rt_prio);
417 diff |= _DIFF(ROUTE_ATTR_DST, nl_addr_cmp(a->rt_dst, b->rt_dst));
418 diff |= _DIFF(ROUTE_ATTR_SRC, nl_addr_cmp(a->rt_src, b->rt_src));
419 diff |= _DIFF(ROUTE_ATTR_IIF, a->rt_iif != b->rt_iif);
420 diff |= _DIFF(ROUTE_ATTR_PREF_SRC,
421 nl_addr_cmp(a->rt_pref_src, b->rt_pref_src));
422 diff |= _DIFF(ROUTE_ATTR_TTL_PROPAGATE,
423 a->rt_ttl_propagate != b->rt_ttl_propagate);
424 diff |= _DIFF(ROUTE_ATTR_NHID, a->rt_nhid != b->rt_nhid);
425
426 if (flags & LOOSE_COMPARISON) {
427 nl_list_for_each_entry(nh_b, &b->rt_nexthops, rtnh_list) {
428 found = 0;
429 nl_list_for_each_entry(nh_a, &a->rt_nexthops,
430 rtnh_list) {
431 if (!rtnl_route_nh_compare(nh_a, nh_b,
432 nh_b->ce_mask, 1)) {
433 found = 1;
434 break;
435 }
436 }
437
438 if (!found)
439 goto nh_mismatch;
440 }
441
442 for (i = 0; i < RTAX_MAX - 1; i++) {
443 if (a->rt_metrics_mask & (1 << i) &&
444 (!(b->rt_metrics_mask & (1 << i)) ||
445 a->rt_metrics[i] != b->rt_metrics[i]))
446 diff |= _DIFF(ROUTE_ATTR_METRICS, 1);
447 }
448
449 diff |= _DIFF(ROUTE_ATTR_FLAGS,
450 (a->rt_flags ^ b->rt_flags) & b->rt_flag_mask);
451 } else {
452 if (a->rt_nr_nh != b->rt_nr_nh)
453 goto nh_mismatch;
454
455 /* search for a dup in each nh of a */
456 nl_list_for_each_entry(nh_a, &a->rt_nexthops, rtnh_list) {
457 found = 0;
458 nl_list_for_each_entry(nh_b, &b->rt_nexthops,
459 rtnh_list) {
460 if (rtnl_route_nh_identical(nh_a, nh_b)) {
461 found = 1;
462 break;
463 }
464 }
465 if (!found)
466 goto nh_mismatch;
467 }
468
469 /* search for a dup in each nh of b, covers case where a has
470 * dupes itself */
471 nl_list_for_each_entry(nh_b, &b->rt_nexthops, rtnh_list) {
472 found = 0;
473 nl_list_for_each_entry(nh_a, &a->rt_nexthops,
474 rtnh_list) {
475 if (rtnl_route_nh_identical(nh_a, nh_b)) {
476 found = 1;
477 break;
478 }
479 }
480 if (!found)
481 goto nh_mismatch;
482 }
483
484 for (i = 0; i < RTAX_MAX - 1; i++) {
485 if ((a->rt_metrics_mask & (1 << i)) ^
486 (b->rt_metrics_mask & (1 << i)))
487 diff |= _DIFF(ROUTE_ATTR_METRICS, 1);
488 else
489 diff |= _DIFF(ROUTE_ATTR_METRICS,
490 a->rt_metrics[i] != b->rt_metrics[i]);
491 }
492
493 diff |= _DIFF(ROUTE_ATTR_FLAGS, a->rt_flags != b->rt_flags);
494 }
495
496out:
497 return diff;
498
499nh_mismatch:
500 diff |= _DIFF(ROUTE_ATTR_MULTIPATH, 1);
501 goto out;
502#undef _DIFF
503}
504
505static int route_update(struct nl_object *old_obj, struct nl_object *new_obj)
506{
507 struct rtnl_route *new_route = (struct rtnl_route *) new_obj;
508 struct rtnl_route *old_route = (struct rtnl_route *) old_obj;
509 struct rtnl_nexthop *new_nh;
510 int action = new_obj->ce_msgtype;
511 char buf[INET6_ADDRSTRLEN+5];
512
513 /*
514 * ipv6 ECMP route notifications from the kernel come as
515 * separate notifications, one for every nexthop. This update
516 * function collapses such route msgs into a single
517 * route with multiple nexthops. The resulting object looks
518 * similar to a ipv4 ECMP route
519 */
520 if (new_route->rt_family != AF_INET6 ||
521 new_route->rt_table == RT_TABLE_LOCAL)
522 return -NLE_OPNOTSUPP;
523
524 /*
525 * For routes that are already multipath,
526 * or dont have a nexthop dont do anything
527 */
528 if (rtnl_route_get_nnexthops(new_route) != 1)
529 return -NLE_OPNOTSUPP;
530
531 /*
532 * Get the only nexthop entry from the new route. For
533 * IPv6 we always get a route with a 0th NH
534 * filled or nothing at all
535 */
536 new_nh = rtnl_route_nexthop_n(new_route, 0);
537 if (!new_nh || !rtnl_route_nh_get_gateway(new_nh))
538 return -NLE_OPNOTSUPP;
539
540 switch(action) {
541 case RTM_NEWROUTE : {
542 struct rtnl_nexthop *cloned_nh;
543 struct rtnl_nexthop *old_nh;
544
545 /*
546 * Do not add the nexthop to old route if it was already added before
547 */
548 nl_list_for_each_entry(old_nh, &old_route->rt_nexthops, rtnh_list) {
549 if (rtnl_route_nh_identical(old_nh, new_nh)) {
550 return 0;
551 }
552 }
553
554 /*
555 * Add the nexthop to old route
556 */
557 cloned_nh = rtnl_route_nh_clone(new_nh);
558 if (!cloned_nh)
559 return -NLE_NOMEM;
560 rtnl_route_add_nexthop(old_route, cloned_nh);
561
562 NL_DBG(2, "Route obj %p updated. Added "
563 "nexthop %p via %s\n", old_route, cloned_nh,
564 nl_addr2str(cloned_nh->rtnh_gateway, buf,
565 sizeof(buf)));
566 }
567 break;
568 case RTM_DELROUTE : {
569 struct rtnl_nexthop *old_nh;
570
571 /*
572 * Only take care of nexthop deletes and not
573 * route deletes. So, if there is only one nexthop
574 * quite likely we did not update it. So dont do
575 * anything and return
576 */
577 if (rtnl_route_get_nnexthops(old_route) <= 1)
578 return -NLE_OPNOTSUPP;
579
580 /*
581 * Find the next hop in old route and delete it
582 */
583 nl_list_for_each_entry(old_nh, &old_route->rt_nexthops,
584 rtnh_list) {
585 if (rtnl_route_nh_identical(old_nh, new_nh)) {
586
587 rtnl_route_remove_nexthop(old_route, old_nh);
588
589 NL_DBG(2, "Route obj %p updated. Removed "
590 "nexthop %p via %s\n", old_route,
591 old_nh,
592 nl_addr2str(old_nh->rtnh_gateway, buf,
593 sizeof(buf)));
594
595 rtnl_route_nh_free(old_nh);
596 break;
597 }
598 }
599 }
600 break;
601 default:
602 NL_DBG(2, "Unknown action associated "
603 "to object %p during route update\n", new_obj);
604 return -NLE_OPNOTSUPP;
605 }
606
607 return NLE_SUCCESS;
608}
609
610static const struct trans_tbl route_attrs[] = {
611 __ADD(ROUTE_ATTR_FAMILY, family),
612 __ADD(ROUTE_ATTR_TOS, tos),
613 __ADD(ROUTE_ATTR_TABLE, table),
614 __ADD(ROUTE_ATTR_PROTOCOL, protocol),
615 __ADD(ROUTE_ATTR_SCOPE, scope),
616 __ADD(ROUTE_ATTR_TYPE, type),
617 __ADD(ROUTE_ATTR_FLAGS, flags),
618 __ADD(ROUTE_ATTR_DST, dst),
619 __ADD(ROUTE_ATTR_SRC, src),
620 __ADD(ROUTE_ATTR_IIF, iif),
621 __ADD(ROUTE_ATTR_OIF, oif),
622 __ADD(ROUTE_ATTR_GATEWAY, gateway),
623 __ADD(ROUTE_ATTR_PRIO, prio),
624 __ADD(ROUTE_ATTR_PREF_SRC, pref_src),
625 __ADD(ROUTE_ATTR_METRICS, metrics),
626 __ADD(ROUTE_ATTR_MULTIPATH, multipath),
627 __ADD(ROUTE_ATTR_REALMS, realms),
628 __ADD(ROUTE_ATTR_CACHEINFO, cacheinfo),
629 __ADD(ROUTE_ATTR_TTL_PROPAGATE, ttl_propagate),
630 __ADD(ROUTE_ATTR_NHID, nhid),
631};
632
633static char *route_attrs2str(int attrs, char *buf, size_t len)
634{
635 return __flags2str(attrs, buf, len, route_attrs,
636 ARRAY_SIZE(route_attrs));
637}
638
639/**
640 * @name Allocation/Freeing
641 * @{
642 */
643
644struct rtnl_route *rtnl_route_alloc(void)
645{
646 return (struct rtnl_route *) nl_object_alloc(&route_obj_ops);
647}
648
649void rtnl_route_get(struct rtnl_route *route)
650{
651 nl_object_get((struct nl_object *) route);
652}
653
654void rtnl_route_put(struct rtnl_route *route)
655{
656 nl_object_put((struct nl_object *) route);
657}
658
659/** @} */
660
661/**
662 * @name Attributes
663 * @{
664 */
665
666void rtnl_route_set_table(struct rtnl_route *route, uint32_t table)
667{
668 route->rt_table = table;
669 route->ce_mask |= ROUTE_ATTR_TABLE;
670}
671
672uint32_t rtnl_route_get_table(struct rtnl_route *route)
673{
674 return route->rt_table;
675}
676
677void rtnl_route_set_scope(struct rtnl_route *route, uint8_t scope)
678{
679 route->rt_scope = scope;
680 route->ce_mask |= ROUTE_ATTR_SCOPE;
681}
682
683uint8_t rtnl_route_get_scope(struct rtnl_route *route)
684{
685 return route->rt_scope;
686}
687
688void rtnl_route_set_tos(struct rtnl_route *route, uint8_t tos)
689{
690 route->rt_tos = tos;
691 route->ce_mask |= ROUTE_ATTR_TOS;
692}
693
694uint8_t rtnl_route_get_tos(struct rtnl_route *route)
695{
696 return route->rt_tos;
697}
698
699void rtnl_route_set_protocol(struct rtnl_route *route, uint8_t protocol)
700{
701 route->rt_protocol = protocol;
702 route->ce_mask |= ROUTE_ATTR_PROTOCOL;
703}
704
705uint8_t rtnl_route_get_protocol(struct rtnl_route *route)
706{
707 return route->rt_protocol;
708}
709
710void rtnl_route_set_priority(struct rtnl_route *route, uint32_t prio)
711{
712 route->rt_prio = prio;
713 route->ce_mask |= ROUTE_ATTR_PRIO;
714}
715
716uint32_t rtnl_route_get_priority(struct rtnl_route *route)
717{
718 return route->rt_prio;
719}
720
721int rtnl_route_set_family(struct rtnl_route *route, uint8_t family)
722{
723 switch(family) {
724 case AF_INET:
725 case AF_INET6:
726 case AF_DECnet:
727 case AF_MPLS:
728 route->rt_family = family;
729 route->ce_mask |= ROUTE_ATTR_FAMILY;
730 return 0;
731 }
732
733 return -NLE_AF_NOSUPPORT;
734}
735
736uint8_t rtnl_route_get_family(struct rtnl_route *route)
737{
738 return route->rt_family;
739}
740
741int rtnl_route_set_dst(struct rtnl_route *route, struct nl_addr *addr)
742{
743 if (route->ce_mask & ROUTE_ATTR_FAMILY) {
744 if (addr->a_family != route->rt_family)
745 return -NLE_AF_MISMATCH;
746 } else
747 route->rt_family = addr->a_family;
748
749 if (route->rt_dst)
750 nl_addr_put(route->rt_dst);
751
752 nl_addr_get(addr);
753 route->rt_dst = addr;
754
755 route->ce_mask |= (ROUTE_ATTR_DST | ROUTE_ATTR_FAMILY);
756
757 return 0;
758}
759
760struct nl_addr *rtnl_route_get_dst(struct rtnl_route *route)
761{
762 return route->rt_dst;
763}
764
765int rtnl_route_set_src(struct rtnl_route *route, struct nl_addr *addr)
766{
767 if (addr->a_family == AF_INET)
768 return -NLE_SRCRT_NOSUPPORT;
769
770 if (route->ce_mask & ROUTE_ATTR_FAMILY) {
771 if (addr->a_family != route->rt_family)
772 return -NLE_AF_MISMATCH;
773 } else
774 route->rt_family = addr->a_family;
775
776 if (route->rt_src)
777 nl_addr_put(route->rt_src);
778
779 nl_addr_get(addr);
780 route->rt_src = addr;
781 route->ce_mask |= (ROUTE_ATTR_SRC | ROUTE_ATTR_FAMILY);
782
783 return 0;
784}
785
786struct nl_addr *rtnl_route_get_src(struct rtnl_route *route)
787{
788 return route->rt_src;
789}
790
791int rtnl_route_set_type(struct rtnl_route *route, uint8_t type)
792{
793 if (type > RTN_MAX)
794 return -NLE_RANGE;
795
796 route->rt_type = type;
797 route->ce_mask |= ROUTE_ATTR_TYPE;
798
799 return 0;
800}
801
802uint8_t rtnl_route_get_type(struct rtnl_route *route)
803{
804 return route->rt_type;
805}
806
807void rtnl_route_set_flags(struct rtnl_route *route, uint32_t flags)
808{
809 route->rt_flag_mask |= flags;
810 route->rt_flags |= flags;
811 route->ce_mask |= ROUTE_ATTR_FLAGS;
812}
813
814void rtnl_route_unset_flags(struct rtnl_route *route, uint32_t flags)
815{
816 route->rt_flag_mask |= flags;
817 route->rt_flags &= ~flags;
818 route->ce_mask |= ROUTE_ATTR_FLAGS;
819}
820
821uint32_t rtnl_route_get_flags(struct rtnl_route *route)
822{
823 return route->rt_flags;
824}
825
826int rtnl_route_set_metric(struct rtnl_route *route, int metric, uint32_t value)
827{
828 if (metric > RTAX_MAX || metric < 1)
829 return -NLE_RANGE;
830
831 route->rt_metrics[metric - 1] = value;
832
833 if (!(route->rt_metrics_mask & (1 << (metric - 1)))) {
834 route->rt_nmetrics++;
835 route->rt_metrics_mask |= (1 << (metric - 1));
836 }
837
838 route->ce_mask |= ROUTE_ATTR_METRICS;
839
840 return 0;
841}
842
843int rtnl_route_unset_metric(struct rtnl_route *route, int metric)
844{
845 if (metric > RTAX_MAX || metric < 1)
846 return -NLE_RANGE;
847
848 if (route->rt_metrics_mask & (1 << (metric - 1))) {
849 route->rt_nmetrics--;
850 route->rt_metrics_mask &= ~(1 << (metric - 1));
851 }
852
853 return 0;
854}
855
856int rtnl_route_get_metric(struct rtnl_route *route, int metric, uint32_t *value)
857{
858 if (metric > RTAX_MAX || metric < 1)
859 return -NLE_RANGE;
860
861 if (!(route->rt_metrics_mask & (1 << (metric - 1))))
862 return -NLE_OBJ_NOTFOUND;
863
864 if (value)
865 *value = route->rt_metrics[metric - 1];
866
867 return 0;
868}
869
870int rtnl_route_set_pref_src(struct rtnl_route *route, struct nl_addr *addr)
871{
872 if (route->ce_mask & ROUTE_ATTR_FAMILY) {
873 if (addr->a_family != route->rt_family)
874 return -NLE_AF_MISMATCH;
875 } else
876 route->rt_family = addr->a_family;
877
878 if (route->rt_pref_src)
879 nl_addr_put(route->rt_pref_src);
880
881 nl_addr_get(addr);
882 route->rt_pref_src = addr;
883 route->ce_mask |= (ROUTE_ATTR_PREF_SRC | ROUTE_ATTR_FAMILY);
884
885 return 0;
886}
887
888struct nl_addr *rtnl_route_get_pref_src(struct rtnl_route *route)
889{
890 return route->rt_pref_src;
891}
892
893void rtnl_route_set_iif(struct rtnl_route *route, int ifindex)
894{
895 route->rt_iif = ifindex;
896 route->ce_mask |= ROUTE_ATTR_IIF;
897}
898
899int rtnl_route_get_iif(struct rtnl_route *route)
900{
901 return route->rt_iif;
902}
903
904void rtnl_route_add_nexthop(struct rtnl_route *route, struct rtnl_nexthop *nh)
905{
906 nl_list_add_tail(&nh->rtnh_list, &route->rt_nexthops);
907 route->rt_nr_nh++;
908 route->ce_mask |= ROUTE_ATTR_MULTIPATH;
909}
910
911void rtnl_route_remove_nexthop(struct rtnl_route *route, struct rtnl_nexthop *nh)
912{
913 if (route->ce_mask & ROUTE_ATTR_MULTIPATH) {
914 route->rt_nr_nh--;
915 nl_list_del(&nh->rtnh_list);
916 }
917}
918
919struct nl_list_head *rtnl_route_get_nexthops(struct rtnl_route *route)
920{
921 if (route->ce_mask & ROUTE_ATTR_MULTIPATH)
922 return &route->rt_nexthops;
923
924 return NULL;
925}
926
927int rtnl_route_get_nnexthops(struct rtnl_route *route)
928{
929 if (route->ce_mask & ROUTE_ATTR_MULTIPATH)
930 return route->rt_nr_nh;
931
932 return 0;
933}
934
935void rtnl_route_foreach_nexthop(struct rtnl_route *r,
936 void (*cb)(struct rtnl_nexthop *, void *),
937 void *arg)
938{
939 struct rtnl_nexthop *nh;
940
941 if (r->ce_mask & ROUTE_ATTR_MULTIPATH) {
942 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) {
943 cb(nh, arg);
944 }
945 }
946}
947
948struct rtnl_nexthop *rtnl_route_nexthop_n(struct rtnl_route *r, int n)
949{
950 struct rtnl_nexthop *nh;
951
952 if (r->ce_mask & ROUTE_ATTR_MULTIPATH && n >= 0 &&
953 ((unsigned)n) < r->rt_nr_nh) {
954 int i;
955
956 i = 0;
957 nl_list_for_each_entry(nh, &r->rt_nexthops, rtnh_list) {
958 if (i == n) return nh;
959 i++;
960 }
961 }
962 return NULL;
963}
964
965void rtnl_route_set_ttl_propagate(struct rtnl_route *route, uint8_t ttl_prop)
966{
967 route->rt_ttl_propagate = ttl_prop;
968 route->ce_mask |= ROUTE_ATTR_TTL_PROPAGATE;
969}
970
971int rtnl_route_get_ttl_propagate(struct rtnl_route *route)
972{
973 if (!route)
974 return -NLE_INVAL;
975 if (!(route->ce_mask & ROUTE_ATTR_TTL_PROPAGATE))
976 return -NLE_MISSING_ATTR;
977 return route->rt_ttl_propagate;
978}
979
980void rtnl_route_set_nhid(struct rtnl_route *route, uint32_t nhid)
981{
982 route->rt_nhid = nhid;
983
984 if (nhid > 0)
985 route->ce_mask |= ROUTE_ATTR_NHID;
986 else
987 route->ce_mask &= ~ROUTE_ATTR_NHID;
988}
989
990uint32_t rtnl_route_get_nhid(struct rtnl_route *route)
991{
992 return route->rt_nhid;
993}
994
995/** @} */
996
997/**
998 * @name Utilities
999 * @{
1000 */
1001
1002/**
1003 * Guess scope of a route object.
1004 * @arg route Route object.
1005 *
1006 * Guesses the scope of a route object, based on the following rules:
1007 * @code
1008 * 1) Local route -> local scope
1009 * 2) At least one nexthop not directly connected -> universe scope
1010 * 3) All others -> link scope
1011 * @endcode
1012 *
1013 * @return Scope value.
1014 */
1015 int rtnl_route_guess_scope(struct rtnl_route *route)
1016{
1017 if (route->rt_type == RTN_LOCAL)
1018 return RT_SCOPE_HOST;
1019
1020 if (route->rt_family == AF_MPLS)
1021 return RT_SCOPE_UNIVERSE;
1022
1023 if (!nl_list_empty(&route->rt_nexthops)) {
1024 struct rtnl_nexthop *nh;
1025
1026 /*
1027 * Use scope uiniverse if there is at least one nexthop which
1028 * is not directly connected
1029 */
1030 nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) {
1031 if (nh->rtnh_gateway || nh->rtnh_via)
1032 return RT_SCOPE_UNIVERSE;
1033 }
1034 }
1035
1036 return RT_SCOPE_LINK;
1037}
1038
1039/** @} */
1040
1041static struct nl_addr *rtnl_route_parse_via(struct nlattr *nla)
1042{
1043 int alen = nla_len(nla) - offsetof(struct rtvia, rtvia_addr);
1044 struct rtvia *via = nla_data(nla);
1045
1046 return nl_addr_build(via->rtvia_family, via->rtvia_addr, alen);
1047}
1048
1049static int rtnl_route_put_via(struct nl_msg *msg, struct nl_addr *addr)
1050{
1051 unsigned int alen = nl_addr_get_len(addr);
1052 struct nlattr *nla;
1053 struct rtvia *via;
1054
1055 nla = nla_reserve(msg, RTA_VIA, alen + sizeof(*via));
1056 if (!nla)
1057 return -EMSGSIZE;
1058
1059 via = nla_data(nla);
1060 via->rtvia_family = nl_addr_get_family(addr);
1061 memcpy(via->rtvia_addr, nl_addr_get_binary_addr(addr), alen);
1062
1063 return 0;
1064}
1065
1066static struct nla_policy route_policy[RTA_MAX+1] = {
1067 [RTA_IIF] = { .type = NLA_U32 },
1068 [RTA_OIF] = { .type = NLA_U32 },
1069 [RTA_PRIORITY] = { .type = NLA_U32 },
1070 [RTA_FLOW] = { .type = NLA_U32 },
1071 [RTA_CACHEINFO] = { .minlen = sizeof(struct rta_cacheinfo) },
1072 [RTA_METRICS] = { .type = NLA_NESTED },
1073 [RTA_MULTIPATH] = { .type = NLA_NESTED },
1074 [RTA_TTL_PROPAGATE] = { .type = NLA_U8 },
1075 [RTA_ENCAP] = { .type = NLA_NESTED },
1076 [RTA_ENCAP_TYPE] = { .type = NLA_U16 },
1077 [RTA_NH_ID] = { .type = NLA_U32 },
1078};
1079
1080static int parse_multipath(struct rtnl_route *route, struct nlattr *attr)
1081{
1082 struct rtnexthop *rtnh = nla_data(attr);
1083 size_t tlen = nla_len(attr);
1084 int err;
1085
1086 while (tlen >= sizeof(*rtnh) && tlen >= rtnh->rtnh_len) {
1087 _nl_auto_rtnl_nexthop struct rtnl_nexthop *nh = NULL;
1088
1089 nh = rtnl_route_nh_alloc();
1090 if (!nh)
1091 return -NLE_NOMEM;
1092
1093 rtnl_route_nh_set_weight(nh, rtnh->rtnh_hops);
1094 rtnl_route_nh_set_ifindex(nh, rtnh->rtnh_ifindex);
1095 rtnl_route_nh_set_flags(nh, rtnh->rtnh_flags);
1096
1097 if (rtnh->rtnh_len > sizeof(*rtnh)) {
1098 struct nlattr *ntb[RTA_MAX + 1];
1099
1100 err = nla_parse(ntb, RTA_MAX, (struct nlattr *)
1101 RTNH_DATA(rtnh),
1102 rtnh->rtnh_len - sizeof(*rtnh),
1103 route_policy);
1104 if (err < 0)
1105 return err;
1106
1107 if (ntb[RTA_GATEWAY]) {
1108 _nl_auto_nl_addr struct nl_addr *addr = NULL;
1109
1110 addr = nl_addr_alloc_attr(ntb[RTA_GATEWAY],
1111 route->rt_family);
1112 if (!addr)
1113 return -NLE_NOMEM;
1114
1115 rtnl_route_nh_set_gateway(nh, addr);
1116 }
1117
1118 if (ntb[RTA_FLOW]) {
1119 uint32_t realms;
1120
1121 realms = nla_get_u32(ntb[RTA_FLOW]);
1122 rtnl_route_nh_set_realms(nh, realms);
1123 }
1124
1125 if (ntb[RTA_NEWDST]) {
1126 _nl_auto_nl_addr struct nl_addr *addr = NULL;
1127
1128 addr = nl_addr_alloc_attr(ntb[RTA_NEWDST],
1129 route->rt_family);
1130 if (!addr)
1131 return -NLE_NOMEM;
1132
1133 err = rtnl_route_nh_set_newdst(nh, addr);
1134 if (err < 0)
1135 return err;
1136 }
1137
1138 if (ntb[RTA_VIA]) {
1139 _nl_auto_nl_addr struct nl_addr *addr = NULL;
1140
1141 addr = rtnl_route_parse_via(ntb[RTA_VIA]);
1142 if (!addr)
1143 return -NLE_NOMEM;
1144
1145 err = rtnl_route_nh_set_via(nh, addr);
1146 if (err < 0)
1147 return err;
1148 }
1149
1150 if (ntb[RTA_ENCAP] && ntb[RTA_ENCAP_TYPE]) {
1151 err = nh_encap_parse_msg(ntb[RTA_ENCAP],
1152 ntb[RTA_ENCAP_TYPE],
1153 nh);
1154 if (err < 0)
1155 return err;
1156 }
1157 }
1158
1159 rtnl_route_add_nexthop(route, _nl_steal_pointer(&nh));
1160 tlen -= RTNH_ALIGN(rtnh->rtnh_len);
1161 rtnh = RTNH_NEXT(rtnh);
1162 }
1163
1164 return 0;
1165}
1166
1167int rtnl_route_parse(struct nlmsghdr *nlh, struct rtnl_route **result)
1168{
1169 _nl_auto_rtnl_route struct rtnl_route *route = NULL;
1170 _nl_auto_rtnl_nexthop struct rtnl_nexthop *old_nh = NULL;
1171 _nl_auto_nl_addr struct nl_addr *src = NULL;
1172 _nl_auto_nl_addr struct nl_addr *dst = NULL;
1173 struct nlattr *tb[RTA_MAX + 1];
1174 struct rtmsg *rtm;
1175 int family;
1176 int err;
1177
1178 route = rtnl_route_alloc();
1179 if (!route)
1180 return -NLE_NOMEM;
1181
1182 route->ce_msgtype = nlh->nlmsg_type;
1183
1184 err = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, RTA_MAX, route_policy);
1185 if (err < 0)
1186 return err;
1187
1188 rtm = nlmsg_data(nlh);
1189 route->rt_family = family = rtm->rtm_family;
1190 route->rt_tos = rtm->rtm_tos;
1191 route->rt_table = rtm->rtm_table;
1192 route->rt_type = rtm->rtm_type;
1193 route->rt_scope = rtm->rtm_scope;
1194 route->rt_protocol = rtm->rtm_protocol;
1195 route->rt_flags = rtm->rtm_flags;
1196 route->rt_prio = 0;
1197
1198 route->ce_mask |= ROUTE_ATTR_FAMILY | ROUTE_ATTR_TOS |
1199 ROUTE_ATTR_TABLE | ROUTE_ATTR_TYPE |
1200 ROUTE_ATTR_SCOPE | ROUTE_ATTR_PROTOCOL |
1201 ROUTE_ATTR_FLAGS;
1202
1203 /* right now MPLS does not allow rt_prio to be set, so don't
1204 * assume it is unless it comes from an attribute
1205 */
1206 if (family != AF_MPLS)
1207 route->ce_mask |= ROUTE_ATTR_PRIO;
1208
1209 if (tb[RTA_DST]) {
1210 if (!(dst = nl_addr_alloc_attr(tb[RTA_DST], family)))
1211 return -NLE_NOMEM;
1212 } else {
1213 int len;
1214
1215 switch (family) {
1216 case AF_INET:
1217 len = 4;
1218 break;
1219
1220 case AF_INET6:
1221 len = 16;
1222 break;
1223 default:
1224 len = 0;
1225 break;
1226 }
1227
1228 if (!(dst = nl_addr_build(family, NULL, len)))
1229 return -NLE_NOMEM;
1230 }
1231
1232 nl_addr_set_prefixlen(dst, rtm->rtm_dst_len);
1233 err = rtnl_route_set_dst(route, dst);
1234 if (err < 0)
1235 return err;
1236
1237 if (tb[RTA_SRC]) {
1238 if (!(src = nl_addr_alloc_attr(tb[RTA_SRC], family)))
1239 return -NLE_NOMEM;
1240 } else if (rtm->rtm_src_len)
1241 if (!(src = nl_addr_alloc(0)))
1242 return -NLE_NOMEM;
1243
1244 if (src) {
1245 nl_addr_set_prefixlen(src, rtm->rtm_src_len);
1246 rtnl_route_set_src(route, src);
1247 }
1248
1249 if (tb[RTA_TABLE])
1250 rtnl_route_set_table(route, nla_get_u32(tb[RTA_TABLE]));
1251
1252 if (tb[RTA_IIF])
1253 rtnl_route_set_iif(route, nla_get_u32(tb[RTA_IIF]));
1254
1255 if (tb[RTA_PRIORITY])
1256 rtnl_route_set_priority(route, nla_get_u32(tb[RTA_PRIORITY]));
1257
1258 if (tb[RTA_PREFSRC]) {
1259 _nl_auto_nl_addr struct nl_addr *addr = NULL;
1260
1261 if (!(addr = nl_addr_alloc_attr(tb[RTA_PREFSRC], family)))
1262 return -NLE_NOMEM;
1263 rtnl_route_set_pref_src(route, addr);
1264 }
1265
1266 if (tb[RTA_METRICS]) {
1267 struct nlattr *mtb[RTAX_MAX + 1];
1268 int i;
1269
1270 err = nla_parse_nested(mtb, RTAX_MAX, tb[RTA_METRICS], NULL);
1271 if (err < 0)
1272 return err;
1273
1274 for (i = 1; i <= RTAX_MAX; i++) {
1275 if (mtb[i] && _nla_len(mtb[i]) >= sizeof(uint32_t)) {
1276 uint32_t m = nla_get_u32(mtb[i]);
1277
1278 err = rtnl_route_set_metric(route, i, m);
1279 if (err < 0)
1280 return err;
1281 }
1282 }
1283 }
1284
1285 if (tb[RTA_MULTIPATH]) {
1286 if ((err = parse_multipath(route, tb[RTA_MULTIPATH])) < 0)
1287 return err;
1288 }
1289
1290 if (tb[RTA_CACHEINFO]) {
1291 nla_memcpy(&route->rt_cacheinfo, tb[RTA_CACHEINFO],
1292 sizeof(route->rt_cacheinfo));
1293 route->ce_mask |= ROUTE_ATTR_CACHEINFO;
1294 }
1295
1296 if (tb[RTA_OIF]) {
1297 if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
1298 return -NLE_NOMEM;
1299
1300 rtnl_route_nh_set_ifindex(old_nh, nla_get_u32(tb[RTA_OIF]));
1301 }
1302
1303 if (tb[RTA_GATEWAY]) {
1304 _nl_auto_nl_addr struct nl_addr *addr = NULL;
1305
1306 if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
1307 return -NLE_NOMEM;
1308
1309 if (!(addr = nl_addr_alloc_attr(tb[RTA_GATEWAY], family)))
1310 return -NLE_NOMEM;
1311
1312 rtnl_route_nh_set_gateway(old_nh, addr);
1313 }
1314
1315 if (tb[RTA_FLOW]) {
1316 if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
1317 return -NLE_NOMEM;
1318
1319 rtnl_route_nh_set_realms(old_nh, nla_get_u32(tb[RTA_FLOW]));
1320 }
1321
1322 if (tb[RTA_NEWDST]) {
1323 _nl_auto_nl_addr struct nl_addr *addr = NULL;
1324
1325 if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
1326 return -NLE_NOMEM;
1327
1328 addr = nl_addr_alloc_attr(tb[RTA_NEWDST], route->rt_family);
1329 if (!addr)
1330 return -NLE_NOMEM;
1331
1332 err = rtnl_route_nh_set_newdst(old_nh, addr);
1333 if (err < 0)
1334 return err;
1335 }
1336
1337 if (tb[RTA_VIA]) {
1338 int alen = nla_len(tb[RTA_VIA]) - offsetof(struct rtvia, rtvia_addr);
1339 _nl_auto_nl_addr struct nl_addr *addr = NULL;
1340 struct rtvia *via = nla_data(tb[RTA_VIA]);
1341
1342 if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
1343 return -NLE_NOMEM;
1344
1345 addr = nl_addr_build(via->rtvia_family, via->rtvia_addr, alen);
1346 if (!addr)
1347 return -NLE_NOMEM;
1348
1349 err = rtnl_route_nh_set_via(old_nh, addr);
1350 if (err < 0)
1351 return err;
1352 }
1353
1354 if (tb[RTA_TTL_PROPAGATE]) {
1355 rtnl_route_set_ttl_propagate(route,
1356 nla_get_u8(tb[RTA_TTL_PROPAGATE]));
1357 }
1358
1359 if (tb[RTA_ENCAP] && tb[RTA_ENCAP_TYPE]) {
1360 if (!old_nh && !(old_nh = rtnl_route_nh_alloc()))
1361 return -NLE_NOMEM;
1362
1363 err = nh_encap_parse_msg(tb[RTA_ENCAP],
1364 tb[RTA_ENCAP_TYPE], old_nh);
1365 if (err < 0)
1366 return err;
1367 }
1368
1369 if (tb[RTA_NH_ID]) {
1370 rtnl_route_set_nhid(route, nla_get_u32(tb[RTA_NH_ID]));
1371 }
1372
1373 if (old_nh) {
1374 rtnl_route_nh_set_flags(old_nh, rtm->rtm_flags & 0xff);
1375 if (route->rt_nr_nh == 0) {
1376 /* If no nexthops have been provided via RTA_MULTIPATH
1377 * we add it as regular nexthop to maintain backwards
1378 * compatibility */
1379 rtnl_route_add_nexthop(route, _nl_steal_pointer(&old_nh));
1380 } else {
1381 /* Kernel supports new style nexthop configuration,
1382 * verify that it is a duplicate and discard nexthop. */
1383 struct rtnl_nexthop *first;
1384
1385 first = nl_list_first_entry(&route->rt_nexthops,
1386 struct rtnl_nexthop,
1387 rtnh_list);
1388 if (!first)
1389 BUG();
1390
1391 if (rtnl_route_nh_compare(old_nh, first,
1392 old_nh->ce_mask, 0)) {
1393 return -NLE_INVAL;
1394 }
1395 }
1396 }
1397
1398 *result = _nl_steal_pointer(&route);
1399 return 0;
1400}
1401
1402int rtnl_route_build_msg(struct nl_msg *msg, struct rtnl_route *route)
1403{
1404 int i;
1405 struct nlattr *metrics;
1406 struct rtmsg rtmsg = {
1407 .rtm_family = route->rt_family,
1408 .rtm_tos = route->rt_tos,
1409 .rtm_table = route->rt_table,
1410 .rtm_protocol = route->rt_protocol,
1411 .rtm_scope = route->rt_scope,
1412 .rtm_type = route->rt_type,
1413 .rtm_flags = route->rt_flags,
1414 };
1415
1416 if (route->rt_dst == NULL)
1417 return -NLE_MISSING_ATTR;
1418
1419 rtmsg.rtm_dst_len = nl_addr_get_prefixlen(route->rt_dst);
1420 if (route->rt_src)
1421 rtmsg.rtm_src_len = nl_addr_get_prefixlen(route->rt_src);
1422
1423 if (!(route->ce_mask & ROUTE_ATTR_SCOPE))
1424 rtmsg.rtm_scope = rtnl_route_guess_scope(route);
1425
1426 if (rtnl_route_get_nnexthops(route) == 1) {
1427 struct rtnl_nexthop *nh;
1428 nh = rtnl_route_nexthop_n(route, 0);
1429 rtmsg.rtm_flags |= nh->rtnh_flags;
1430 }
1431
1432 if (nlmsg_append(msg, &rtmsg, sizeof(rtmsg), NLMSG_ALIGNTO) < 0)
1433 goto nla_put_failure;
1434
1435 /* Additional table attribute replacing the 8bit in the header, was
1436 * required to allow more than 256 tables. MPLS does not allow the
1437 * table attribute to be set
1438 */
1439 if (route->rt_family != AF_MPLS)
1440 NLA_PUT_U32(msg, RTA_TABLE, route->rt_table);
1441
1442 if (nl_addr_get_len(route->rt_dst))
1443 NLA_PUT_ADDR(msg, RTA_DST, route->rt_dst);
1444
1445 if (route->ce_mask & ROUTE_ATTR_PRIO)
1446 NLA_PUT_U32(msg, RTA_PRIORITY, route->rt_prio);
1447
1448 if (route->ce_mask & ROUTE_ATTR_SRC)
1449 NLA_PUT_ADDR(msg, RTA_SRC, route->rt_src);
1450
1451 if (route->ce_mask & ROUTE_ATTR_PREF_SRC)
1452 NLA_PUT_ADDR(msg, RTA_PREFSRC, route->rt_pref_src);
1453
1454 if (route->ce_mask & ROUTE_ATTR_IIF)
1455 NLA_PUT_U32(msg, RTA_IIF, route->rt_iif);
1456
1457 if (route->ce_mask & ROUTE_ATTR_TTL_PROPAGATE)
1458 NLA_PUT_U8(msg, RTA_TTL_PROPAGATE, route->rt_ttl_propagate);
1459
1460 if (route->rt_nmetrics > 0) {
1461 uint32_t val;
1462
1463 metrics = nla_nest_start(msg, RTA_METRICS);
1464 if (metrics == NULL)
1465 goto nla_put_failure;
1466
1467 for (i = 1; i <= RTAX_MAX; i++) {
1468 if (!rtnl_route_get_metric(route, i, &val))
1469 NLA_PUT_U32(msg, i, val);
1470 }
1471
1472 nla_nest_end(msg, metrics);
1473 }
1474
1475 /* Nexthop specification and nexthop id are mutually exclusive */
1476 if (route->ce_mask & ROUTE_ATTR_NHID) {
1477 NLA_PUT_U32(msg, RTA_NH_ID, route->rt_nhid);
1478 } else if (rtnl_route_get_nnexthops(route) == 1) {
1479 struct rtnl_nexthop *nh;
1480
1481 nh = rtnl_route_nexthop_n(route, 0);
1482 if (nh->rtnh_gateway)
1483 NLA_PUT_ADDR(msg, RTA_GATEWAY, nh->rtnh_gateway);
1484 if (nh->rtnh_ifindex)
1485 NLA_PUT_U32(msg, RTA_OIF, nh->rtnh_ifindex);
1486 if (nh->rtnh_realms)
1487 NLA_PUT_U32(msg, RTA_FLOW, nh->rtnh_realms);
1488 if (nh->rtnh_newdst)
1489 NLA_PUT_ADDR(msg, RTA_NEWDST, nh->rtnh_newdst);
1490 if (nh->rtnh_via && rtnl_route_put_via(msg, nh->rtnh_via) < 0)
1491 goto nla_put_failure;
1492 if (nh->rtnh_encap &&
1493 nh_encap_build_msg(msg, nh->rtnh_encap) < 0)
1494 goto nla_put_failure;
1495 } else if (rtnl_route_get_nnexthops(route) > 1) {
1496 struct nlattr *multipath;
1497 struct rtnl_nexthop *nh;
1498
1499 if (!(multipath = nla_nest_start(msg, RTA_MULTIPATH)))
1500 goto nla_put_failure;
1501
1502 nl_list_for_each_entry(nh, &route->rt_nexthops, rtnh_list) {
1503 struct rtnexthop *rtnh;
1504
1505 rtnh = nlmsg_reserve(msg, sizeof(*rtnh), NLMSG_ALIGNTO);
1506 if (!rtnh)
1507 goto nla_put_failure;
1508
1509 rtnh->rtnh_flags = nh->rtnh_flags;
1510 rtnh->rtnh_hops = nh->rtnh_weight;
1511 rtnh->rtnh_ifindex = nh->rtnh_ifindex;
1512
1513 if (nh->rtnh_gateway)
1514 NLA_PUT_ADDR(msg, RTA_GATEWAY,
1515 nh->rtnh_gateway);
1516
1517 if (nh->rtnh_newdst)
1518 NLA_PUT_ADDR(msg, RTA_NEWDST, nh->rtnh_newdst);
1519
1520 if (nh->rtnh_via &&
1521 rtnl_route_put_via(msg, nh->rtnh_via) < 0)
1522 goto nla_put_failure;
1523
1524 if (nh->rtnh_realms)
1525 NLA_PUT_U32(msg, RTA_FLOW, nh->rtnh_realms);
1526
1527 if (nh->rtnh_encap &&
1528 nh_encap_build_msg(msg, nh->rtnh_encap) < 0)
1529 goto nla_put_failure;
1530
1531 rtnh->rtnh_len = (char *) nlmsg_tail(msg->nm_nlh) -
1532 (char *) rtnh;
1533 }
1534
1535 nla_nest_end(msg, multipath);
1536 }
1537
1538 return 0;
1539
1540nla_put_failure:
1541 return -NLE_MSGSIZE;
1542}
1543
1544/** @cond SKIP */
1545struct nl_object_ops route_obj_ops = {
1546 .oo_name = "route/route",
1547 .oo_size = sizeof(struct rtnl_route),
1548 .oo_constructor = route_constructor,
1549 .oo_free_data = route_free_data,
1550 .oo_clone = route_clone,
1551 .oo_dump = {
1552 [NL_DUMP_LINE] = route_dump_line,
1553 [NL_DUMP_DETAILS] = route_dump_details,
1554 [NL_DUMP_STATS] = route_dump_stats,
1555 },
1556 .oo_compare = route_compare,
1557 .oo_keygen = route_keygen,
1558 .oo_update = route_update,
1559 .oo_attrs2str = route_attrs2str,
1560 .oo_id_attrs = (ROUTE_ATTR_FAMILY | ROUTE_ATTR_TOS |
1561 ROUTE_ATTR_TABLE | ROUTE_ATTR_DST |
1562 ROUTE_ATTR_PRIO),
1563 .oo_id_attrs_get = route_id_attrs_get,
1564};
1565/** @endcond */
1566
1567/** @} */
nl_addr_iszero
int nl_addr_iszero(const struct nl_addr *addr)
Returns true if the address consists of all zeros.
Definition addr.c:652
nl_addr_set_prefixlen
void nl_addr_set_prefixlen(struct nl_addr *addr, int prefixlen)
Set the prefix length of an abstract address.
Definition addr.c:967
nl_addr_get
struct nl_addr * nl_addr_get(struct nl_addr *addr)
Increase the reference counter of an abstract address.
Definition addr.c:525
nl_addr_build
struct nl_addr * nl_addr_build(int family, const void *buf, size_t size)
Allocate abstract address based on a binary address.
Definition addr.c:216
nl_addr_alloc_attr
struct nl_addr * nl_addr_alloc_attr(const struct nlattr *nla, int family)
Allocate abstract address based on Netlink attribute.
Definition addr.c:261
nl_addr_get_binary_addr
void * nl_addr_get_binary_addr(const struct nl_addr *addr)
Get binary address of abstract address object.
Definition addr.c:943
nl_addr_cmp
int nl_addr_cmp(const struct nl_addr *a, const struct nl_addr *b)
Compare abstract addresses.
Definition addr.c:587
nl_addr_alloc
struct nl_addr * nl_addr_alloc(size_t maxsize)
Allocate empty abstract address.
Definition addr.c:185
nl_addr_clone
struct nl_addr * nl_addr_clone(const struct nl_addr *addr)
Clone existing abstract address object.
Definition addr.c:495
nl_addr_get_family
int nl_addr_get_family(const struct nl_addr *addr)
Return address family.
Definition addr.c:895
nl_addr2str
char * nl_addr2str(const struct nl_addr *addr, char *buf, size_t size)
Convert abstract address object to character string.
Definition addr.c:1001
nl_addr_get_prefixlen
unsigned int nl_addr_get_prefixlen(const struct nl_addr *addr)
Return prefix length of abstract address object.
Definition addr.c:978
nl_addr_get_len
unsigned int nl_addr_get_len(const struct nl_addr *addr)
Get length of binary address of abstract address object.
Definition addr.c:955
nl_addr_put
void nl_addr_put(struct nl_addr *addr)
Decrease the reference counter of an abstract address.
Definition addr.c:541
nla_get_u32
uint32_t nla_get_u32(const struct nlattr *nla)
Return payload of 32 bit integer attribute.
Definition attr.c:712
NLA_PUT_U8
#define NLA_PUT_U8(msg, attrtype, value)
Add 8 bit integer attribute to netlink message.
Definition attr.h:194
nla_parse
int nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head, int len, const struct nla_policy *policy)
Create attribute index based on a stream of attributes.
Definition attr.c:243
NLA_PUT_ADDR
#define NLA_PUT_ADDR(msg, attrtype, addr)
Add address attribute to netlink message.
Definition attr.h:283
nla_data
void * nla_data(const struct nlattr *nla)
Return pointer to the payload section.
Definition attr.c:119
NLA_PUT_U32
#define NLA_PUT_U32(msg, attrtype, value)
Add 32 bit integer attribute to netlink message.
Definition attr.h:230
nla_get_u8
uint8_t nla_get_u8(const struct nlattr *nla)
Return value of 8 bit integer attribute.
Definition attr.c:612
nla_memcpy
int nla_memcpy(void *dest, const struct nlattr *src, int count)
Copy attribute payload to another memory area.
Definition attr.c:353
nla_nest_start
struct nlattr * nla_nest_start(struct nl_msg *msg, int attrtype)
Start a new level of nested attributes.
Definition attr.c:908
nla_parse_nested
int nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla, const struct nla_policy *policy)
Create attribute index based on nested attribute.
Definition attr.c:1035
nla_len
int nla_len(const struct nlattr *nla)
Return length of the payload .
Definition attr.c:130
nla_nest_end
int nla_nest_end(struct nl_msg *msg, struct nlattr *start)
Finalize nesting of attributes.
Definition attr.c:971
nla_reserve
struct nlattr * nla_reserve(struct nl_msg *msg, int attrtype, int attrlen)
Reserve space for a attribute.
Definition attr.c:459
NLA_U8
@ NLA_U8
8 bit integer
Definition attr.h:35
NLA_U16
@ NLA_U16
16 bit integer
Definition attr.h:36
NLA_NESTED
@ NLA_NESTED
Nested attributes.
Definition attr.h:42
NLA_U32
@ NLA_U32
32 bit integer
Definition attr.h:37
nl_cache_mngt_require_safe
struct nl_cache * nl_cache_mngt_require_safe(const char *name)
Return cache previously provided via nl_cache_mngt_provide()
Definition cache_mngt.c:430
rtnl_link_i2name
char * rtnl_link_i2name(struct nl_cache *cache, int ifindex, char *dst, size_t len)
Translate interface index to corresponding link name.
Definition link.c:1483
nlmsg_data
void * nlmsg_data(const struct nlmsghdr *nlh)
Return pointer to message payload.
Definition msg.c:108
nlmsg_reserve
void * nlmsg_reserve(struct nl_msg *n, size_t len, int pad)
Reserve room for additional data in a netlink message.
Definition msg.c:418
nlmsg_parse
int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, struct nlattr *tb[], int maxtype, const struct nla_policy *policy)
parse attributes of a netlink message
Definition msg.c:219
nlmsg_append
int nlmsg_append(struct nl_msg *n, void *data, size_t len, int pad)
Append data to tail of a netlink message.
Definition msg.c:456
rtnl_route_nh_identical
int rtnl_route_nh_identical(struct rtnl_nexthop *a, struct rtnl_nexthop *b)
Check if the fixed attributes of two nexthops are identical, and may only differ in flags or weight.
Definition nexthop.c:148
nl_object_put
void nl_object_put(struct nl_object *obj)
Release a reference from an object.
Definition object.c:221
nl_object_get
void nl_object_get(struct nl_object *obj)
Acquire a reference on a object.
Definition object.c:210
nl_object_alloc
struct nl_object * nl_object_alloc(struct nl_object_ops *ops)
Allocate a new object of kind specified by the operations handle.
Definition object.c:55
rtnl_route_guess_scope
int rtnl_route_guess_scope(struct rtnl_route *route)
Guess scope of a route object.
Definition route_obj.c:1015
nl_get_user_hz
int nl_get_user_hz(void)
Return the value of HZ.
Definition utils.c:562
nl_dump
void nl_dump(struct nl_dump_params *params, const char *fmt,...)
Dump a formatted character string.
Definition utils.c:1015
NL_DUMP_STATS
@ NL_DUMP_STATS
Dump all attributes including statistics.
Definition types.h:22
NL_DUMP_LINE
@ NL_DUMP_LINE
Dump object briefly on one line.
Definition types.h:20
NL_DUMP_DETAILS
@ NL_DUMP_DETAILS
Dump all attributes but no statistics.
Definition types.h:21
nl_dump_params
Dumping parameters.
Definition types.h:32
nl_dump_params::dp_ivar
int dp_ivar
PRIVATE Owned by the current caller.
Definition types.h:103
nl_list_head
Definition list.h:16
nla_policy
Attribute validation policy.
Definition attr.h:63
nla_policy::type
uint16_t type
Type of attribute or NLA_UNSPEC.
Definition attr.h:65
rtnl_rtcacheinfo
Definition route.h:32