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13#include <stdio.h>
14#include <stdlib.h>
15#include <stdbool.h>
16#include <unistd.h>
17#include <fcntl.h>
18#include <net/if_arp.h>
19#include <sys/socket.h>
20#include <netinet/in.h>
21#include <string.h>
22#include <errno.h>
23#include <time.h>
24#include <sys/uio.h>
25#include <linux/fib_rules.h>
26#include <linux/if_addrlabel.h>
27#include <linux/if_bridge.h>
28#include <linux/nexthop.h>
29
30#include "libnetlink.h"
31#include "utils.h"
32
33#ifndef __aligned
34#define __aligned(x) __attribute__((aligned(x)))
35#endif
36
37#ifndef SOL_NETLINK
38#define SOL_NETLINK 270
39#endif
40
41#ifndef MIN
42#define MIN(a, b) ((a) < (b) ? (a) : (b))
43#endif
44
45int rcvbuf = 1024 * 1024;
46
47#ifdef HAVE_LIBMNL
48#include <libmnl/libmnl.h>
49
50static const enum mnl_attr_data_type extack_policy[NLMSGERR_ATTR_MAX + 1] = {
51 [NLMSGERR_ATTR_MSG] = MNL_TYPE_NUL_STRING,
52 [NLMSGERR_ATTR_OFFS] = MNL_TYPE_U32,
53};
54
55static int err_attr_cb(const struct nlattr *attr, void *data)
56{
57 const struct nlattr **tb = data;
58 uint16_t type;
59
60 if (mnl_attr_type_valid(attr, NLMSGERR_ATTR_MAX) < 0) {
61 fprintf(stderr, "Invalid extack attribute\n");
62 return MNL_CB_ERROR;
63 }
64
65 type = mnl_attr_get_type(attr);
66 if (mnl_attr_validate(attr, extack_policy[type]) < 0) {
67 fprintf(stderr, "extack attribute %d failed validation\n",
68 type);
69 return MNL_CB_ERROR;
70 }
71
72 tb[type] = attr;
73 return MNL_CB_OK;
74}
75
76static void print_ext_ack_msg(bool is_err, const char *msg)
77{
78 fprintf(stderr, "%s: %s", is_err ? "Error" : "Warning", msg);
79 if (msg[strlen(msg) - 1] != '.')
80 fprintf(stderr, ".");
81 fprintf(stderr, "\n");
82}
83
84
85int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
86{
87 struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {};
88 const struct nlmsgerr *err = mnl_nlmsg_get_payload(nlh);
89 const struct nlmsghdr *err_nlh = NULL;
90 unsigned int hlen = sizeof(*err);
91 const char *msg = NULL;
92 uint32_t off = 0;
93
94
95 if (!(nlh->nlmsg_flags & NLM_F_ACK_TLVS))
96 return 0;
97
98
99 if (!(nlh->nlmsg_flags & NLM_F_CAPPED))
100 hlen += mnl_nlmsg_get_payload_len(&err->msg);
101
102 if (mnl_attr_parse(nlh, hlen, err_attr_cb, tb) != MNL_CB_OK)
103 return 0;
104
105 if (tb[NLMSGERR_ATTR_MSG])
106 msg = mnl_attr_get_str(tb[NLMSGERR_ATTR_MSG]);
107
108 if (tb[NLMSGERR_ATTR_OFFS]) {
109 off = mnl_attr_get_u32(tb[NLMSGERR_ATTR_OFFS]);
110
111 if (off > nlh->nlmsg_len) {
112 fprintf(stderr,
113 "Invalid offset for NLMSGERR_ATTR_OFFS\n");
114 off = 0;
115 } else if (!(nlh->nlmsg_flags & NLM_F_CAPPED))
116 err_nlh = &err->msg;
117 }
118
119 if (errfn)
120 return errfn(msg, off, err_nlh);
121
122 if (msg && *msg != '\0') {
123 bool is_err = !!err->error;
124
125 print_ext_ack_msg(is_err, msg);
126 return is_err ? 1 : 0;
127 }
128
129 return 0;
130}
131
132int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, int error)
133{
134 struct nlattr *tb[NLMSGERR_ATTR_MAX + 1] = {};
135 unsigned int hlen = sizeof(int);
136 const char *msg = NULL;
137
138 if (mnl_attr_parse(nlh, hlen, err_attr_cb, tb) != MNL_CB_OK)
139 return 0;
140
141 if (tb[NLMSGERR_ATTR_MSG])
142 msg = mnl_attr_get_str(tb[NLMSGERR_ATTR_MSG]);
143
144 if (msg && *msg != '\0') {
145 bool is_err = !!error;
146
147 print_ext_ack_msg(is_err, msg);
148 return is_err ? 1 : 0;
149 }
150
151 return 0;
152}
153#else
154#warning "libmnl required for error support"
155
156
157int nl_dump_ext_ack(const struct nlmsghdr *nlh, nl_ext_ack_fn_t errfn)
158{
159 return 0;
160}
161
162int nl_dump_ext_ack_done(const struct nlmsghdr *nlh, int error)
163{
164 return 0;
165}
166#endif
167
168
169void rtnl_set_strict_dump(struct rtnl_handle *rth)
170{
171 int one = 1;
172
173 if (setsockopt(rth->fd, SOL_NETLINK, NETLINK_GET_STRICT_CHK,
174 &one, sizeof(one)) < 0)
175 return;
176
177 rth->flags |= RTNL_HANDLE_F_STRICT_CHK;
178}
179
180int rtnl_add_nl_group(struct rtnl_handle *rth, unsigned int group)
181{
182 return setsockopt(rth->fd, SOL_NETLINK, NETLINK_ADD_MEMBERSHIP,
183 &group, sizeof(group));
184}
185
186void rtnl_close(struct rtnl_handle *rth)
187{
188 if (rth->fd >= 0) {
189 close(rth->fd);
190 rth->fd = -1;
191 }
192}
193
194int rtnl_open_byproto(struct rtnl_handle *rth, unsigned int subscriptions,
195 int protocol)
196{
197 socklen_t addr_len;
198 int sndbuf = 32768;
199 int one = 1;
200
201 memset(rth, 0, sizeof(*rth));
202
203 rth->proto = protocol;
204 rth->fd = socket(AF_NETLINK, SOCK_RAW | SOCK_CLOEXEC, protocol);
205 if (rth->fd < 0) {
206 perror("Cannot open netlink socket");
207 return -1;
208 }
209
210 if (setsockopt(rth->fd, SOL_SOCKET, SO_SNDBUF,
211 &sndbuf, sizeof(sndbuf)) < 0) {
212 perror("SO_SNDBUF");
213 return -1;
214 }
215
216 if (setsockopt(rth->fd, SOL_SOCKET, SO_RCVBUF,
217 &rcvbuf, sizeof(rcvbuf)) < 0) {
218 perror("SO_RCVBUF");
219 return -1;
220 }
221
222
223 setsockopt(rth->fd, SOL_NETLINK, NETLINK_EXT_ACK,
224 &one, sizeof(one));
225
226 memset(&rth->local, 0, sizeof(rth->local));
227 rth->local.nl_family = AF_NETLINK;
228 rth->local.nl_groups = subscriptions;
229
230 if (bind(rth->fd, (struct sockaddr *)&rth->local,
231 sizeof(rth->local)) < 0) {
232 perror("Cannot bind netlink socket");
233 return -1;
234 }
235 addr_len = sizeof(rth->local);
236 if (getsockname(rth->fd, (struct sockaddr *)&rth->local,
237 &addr_len) < 0) {
238 perror("Cannot getsockname");
239 return -1;
240 }
241 if (addr_len != sizeof(rth->local)) {
242 fprintf(stderr, "Wrong address length %d\n", addr_len);
243 return -1;
244 }
245 if (rth->local.nl_family != AF_NETLINK) {
246 fprintf(stderr, "Wrong address family %d\n",
247 rth->local.nl_family);
248 return -1;
249 }
250 rth->seq = time(NULL);
251 return 0;
252}
253
254int rtnl_open(struct rtnl_handle *rth, unsigned int subscriptions)
255{
256 return rtnl_open_byproto(rth, subscriptions, NETLINK_ROUTE);
257}
258
259int rtnl_nexthopdump_req(struct rtnl_handle *rth, int family,
260 req_filter_fn_t filter_fn)
261{
262 struct {
263 struct nlmsghdr nlh;
264 struct nhmsg nhm;
265 char buf[128];
266 } req = {
267 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct nhmsg)),
268 .nlh.nlmsg_type = RTM_GETNEXTHOP,
269 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
270 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
271 .nhm.nh_family = family,
272 };
273
274 if (filter_fn) {
275 int err;
276
277 err = filter_fn(&req.nlh, sizeof(req));
278 if (err)
279 return err;
280 }
281
282 return send(rth->fd, &req, sizeof(req), 0);
283}
284
285int rtnl_addrdump_req(struct rtnl_handle *rth, int family,
286 req_filter_fn_t filter_fn)
287{
288 struct {
289 struct nlmsghdr nlh;
290 struct ifaddrmsg ifm;
291 char buf[128];
292 } req = {
293 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
294 .nlh.nlmsg_type = RTM_GETADDR,
295 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
296 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
297 .ifm.ifa_family = family,
298 };
299
300 if (filter_fn) {
301 int err;
302
303 err = filter_fn(&req.nlh, sizeof(req));
304 if (err)
305 return err;
306 }
307
308 return send(rth->fd, &req, sizeof(req), 0);
309}
310
311int rtnl_addrlbldump_req(struct rtnl_handle *rth, int family)
312{
313 struct {
314 struct nlmsghdr nlh;
315 struct ifaddrlblmsg ifal;
316 } req = {
317 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrlblmsg)),
318 .nlh.nlmsg_type = RTM_GETADDRLABEL,
319 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
320 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
321 .ifal.ifal_family = family,
322 };
323
324 return send(rth->fd, &req, sizeof(req), 0);
325}
326
327int rtnl_routedump_req(struct rtnl_handle *rth, int family,
328 req_filter_fn_t filter_fn)
329{
330 struct {
331 struct nlmsghdr nlh;
332 struct rtmsg rtm;
333 char buf[128];
334 } req = {
335 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
336 .nlh.nlmsg_type = RTM_GETROUTE,
337 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
338 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
339 .rtm.rtm_family = family,
340 };
341
342 if (filter_fn) {
343 int err;
344
345 err = filter_fn(&req.nlh, sizeof(req));
346 if (err)
347 return err;
348 }
349
350 return send(rth->fd, &req, sizeof(req), 0);
351}
352
353int rtnl_ruledump_req(struct rtnl_handle *rth, int family)
354{
355 struct {
356 struct nlmsghdr nlh;
357 struct fib_rule_hdr frh;
358 } req = {
359 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct fib_rule_hdr)),
360 .nlh.nlmsg_type = RTM_GETRULE,
361 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
362 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
363 .frh.family = family
364 };
365
366 return send(rth->fd, &req, sizeof(req), 0);
367}
368
369int rtnl_neighdump_req(struct rtnl_handle *rth, int family,
370 req_filter_fn_t filter_fn)
371{
372 struct {
373 struct nlmsghdr nlh;
374 struct ndmsg ndm;
375 char buf[256];
376 } req = {
377 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
378 .nlh.nlmsg_type = RTM_GETNEIGH,
379 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
380 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
381 .ndm.ndm_family = family,
382 };
383
384 if (filter_fn) {
385 int err;
386
387 err = filter_fn(&req.nlh, sizeof(req));
388 if (err)
389 return err;
390 }
391
392 return send(rth->fd, &req, sizeof(req), 0);
393}
394
395int rtnl_neightbldump_req(struct rtnl_handle *rth, int family)
396{
397 struct {
398 struct nlmsghdr nlh;
399 struct ndtmsg ndtmsg;
400 } req = {
401 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndtmsg)),
402 .nlh.nlmsg_type = RTM_GETNEIGHTBL,
403 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
404 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
405 .ndtmsg.ndtm_family = family,
406 };
407
408 return send(rth->fd, &req, sizeof(req), 0);
409}
410
411int rtnl_mdbdump_req(struct rtnl_handle *rth, int family)
412{
413 struct {
414 struct nlmsghdr nlh;
415 struct br_port_msg bpm;
416 } req = {
417 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct br_port_msg)),
418 .nlh.nlmsg_type = RTM_GETMDB,
419 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
420 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
421 .bpm.family = family,
422 };
423
424 return send(rth->fd, &req, sizeof(req), 0);
425}
426
427int rtnl_netconfdump_req(struct rtnl_handle *rth, int family)
428{
429 struct {
430 struct nlmsghdr nlh;
431 struct netconfmsg ncm;
432 char buf[0] __aligned(NLMSG_ALIGNTO);
433 } req = {
434 .nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct netconfmsg))),
435 .nlh.nlmsg_type = RTM_GETNETCONF,
436 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
437 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
438 .ncm.ncm_family = family,
439 };
440
441 return send(rth->fd, &req, sizeof(req), 0);
442}
443
444int rtnl_nsiddump_req_filter_fn(struct rtnl_handle *rth, int family,
445 req_filter_fn_t filter_fn)
446{
447 struct {
448 struct nlmsghdr nlh;
449 struct rtgenmsg rtm;
450 char buf[1024];
451 } req = {
452 .nlh.nlmsg_len = NLMSG_LENGTH(NLMSG_ALIGN(sizeof(struct rtgenmsg))),
453 .nlh.nlmsg_type = RTM_GETNSID,
454 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
455 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
456 .rtm.rtgen_family = family,
457 };
458 int err;
459
460 if (!filter_fn)
461 return -EINVAL;
462
463 err = filter_fn(&req.nlh, sizeof(req));
464 if (err)
465 return err;
466
467 return send(rth->fd, &req, req.nlh.nlmsg_len, 0);
468}
469
470static int __rtnl_linkdump_req(struct rtnl_handle *rth, int family)
471{
472 struct {
473 struct nlmsghdr nlh;
474 struct ifinfomsg ifm;
475 } req = {
476 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
477 .nlh.nlmsg_type = RTM_GETLINK,
478 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
479 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
480 .ifm.ifi_family = family,
481 };
482
483 return send(rth->fd, &req, sizeof(req), 0);
484}
485
486int rtnl_linkdump_req(struct rtnl_handle *rth, int family)
487{
488 if (family == AF_UNSPEC)
489 return rtnl_linkdump_req_filter(rth, family, RTEXT_FILTER_VF);
490
491 return __rtnl_linkdump_req(rth, family);
492}
493
494int rtnl_linkdump_req_filter(struct rtnl_handle *rth, int family,
495 __u32 filt_mask)
496{
497 if (family == AF_UNSPEC || family == AF_BRIDGE) {
498 struct {
499 struct nlmsghdr nlh;
500 struct ifinfomsg ifm;
501
502 struct rtattr ext_req __aligned(NLMSG_ALIGNTO);
503 __u32 ext_filter_mask;
504 } req = {
505 .nlh.nlmsg_len = sizeof(req),
506 .nlh.nlmsg_type = RTM_GETLINK,
507 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
508 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
509 .ifm.ifi_family = family,
510 .ext_req.rta_type = IFLA_EXT_MASK,
511 .ext_req.rta_len = RTA_LENGTH(sizeof(__u32)),
512 .ext_filter_mask = filt_mask,
513 };
514
515 return send(rth->fd, &req, sizeof(req), 0);
516 }
517
518 return __rtnl_linkdump_req(rth, family);
519}
520
521int rtnl_linkdump_req_filter_fn(struct rtnl_handle *rth, int family,
522 req_filter_fn_t filter_fn)
523{
524 if (family == AF_UNSPEC || family == AF_PACKET) {
525 struct {
526 struct nlmsghdr nlh;
527 struct ifinfomsg ifm;
528 char buf[1024];
529 } req = {
530 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
531 .nlh.nlmsg_type = RTM_GETLINK,
532 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
533 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
534 .ifm.ifi_family = family,
535 };
536 int err;
537
538 if (!filter_fn)
539 return -EINVAL;
540
541 err = filter_fn(&req.nlh, sizeof(req));
542 if (err)
543 return err;
544
545 return send(rth->fd, &req, req.nlh.nlmsg_len, 0);
546 }
547
548 return __rtnl_linkdump_req(rth, family);
549}
550
551int rtnl_fdb_linkdump_req_filter_fn(struct rtnl_handle *rth,
552 req_filter_fn_t filter_fn)
553{
554 struct {
555 struct nlmsghdr nlh;
556 struct ifinfomsg ifm;
557 char buf[128];
558 } req = {
559 .nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
560 .nlh.nlmsg_type = RTM_GETNEIGH,
561 .nlh.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
562 .nlh.nlmsg_seq = rth->dump = ++rth->seq,
563 .ifm.ifi_family = PF_BRIDGE,
564 };
565 int err;
566
567 err = filter_fn(&req.nlh, sizeof(req));
568 if (err)
569 return err;
570
571 return send(rth->fd, &req, sizeof(req), 0);
572}
573
574int rtnl_statsdump_req_filter(struct rtnl_handle *rth, int fam, __u32 filt_mask)
575{
576 struct {
577 struct nlmsghdr nlh;
578 struct if_stats_msg ifsm;
579 } req;
580
581 memset(&req, 0, sizeof(req));
582 req.nlh.nlmsg_len = NLMSG_LENGTH(sizeof(struct if_stats_msg));
583 req.nlh.nlmsg_type = RTM_GETSTATS;
584 req.nlh.nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST;
585 req.nlh.nlmsg_pid = 0;
586 req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
587 req.ifsm.family = fam;
588 req.ifsm.filter_mask = filt_mask;
589
590 return send(rth->fd, &req, sizeof(req), 0);
591}
592
593int rtnl_send(struct rtnl_handle *rth, const void *buf, int len)
594{
595 return send(rth->fd, buf, len, 0);
596}
597
598int rtnl_send_check(struct rtnl_handle *rth, const void *buf, int len)
599{
600 struct nlmsghdr *h;
601 int status;
602 char resp[1024];
603
604 status = send(rth->fd, buf, len, 0);
605 if (status < 0)
606 return status;
607
608
609 status = recv(rth->fd, resp, sizeof(resp), MSG_DONTWAIT|MSG_PEEK);
610 if (status < 0) {
611 if (errno == EAGAIN)
612 return 0;
613 return -1;
614 }
615
616 for (h = (struct nlmsghdr *)resp; NLMSG_OK(h, status);
617 h = NLMSG_NEXT(h, status)) {
618 if (h->nlmsg_type == NLMSG_ERROR) {
619 struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
620
621 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr)))
622 fprintf(stderr, "ERROR truncated\n");
623 else
624 errno = -err->error;
625 return -1;
626 }
627 }
628
629 return 0;
630}
631
632int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len)
633{
634 struct nlmsghdr nlh = {
635 .nlmsg_len = NLMSG_LENGTH(len),
636 .nlmsg_type = type,
637 .nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST,
638 .nlmsg_seq = rth->dump = ++rth->seq,
639 };
640 struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
641 struct iovec iov[2] = {
642 { .iov_base = &nlh, .iov_len = sizeof(nlh) },
643 { .iov_base = req, .iov_len = len }
644 };
645 struct msghdr msg = {
646 .msg_name = &nladdr,
647 .msg_namelen = sizeof(nladdr),
648 .msg_iov = iov,
649 .msg_iovlen = 2,
650 };
651
652 return sendmsg(rth->fd, &msg, 0);
653}
654
655int rtnl_dump_request_n(struct rtnl_handle *rth, struct nlmsghdr *n)
656{
657 struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
658 struct iovec iov = {
659 .iov_base = n,
660 .iov_len = n->nlmsg_len
661 };
662 struct msghdr msg = {
663 .msg_name = &nladdr,
664 .msg_namelen = sizeof(nladdr),
665 .msg_iov = &iov,
666 .msg_iovlen = 1,
667 };
668
669 n->nlmsg_flags = NLM_F_DUMP|NLM_F_REQUEST;
670 n->nlmsg_pid = 0;
671 n->nlmsg_seq = rth->dump = ++rth->seq;
672
673 return sendmsg(rth->fd, &msg, 0);
674}
675
676static int rtnl_dump_done(struct nlmsghdr *h)
677{
678 int len = *(int *)NLMSG_DATA(h);
679
680 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(int))) {
681 fprintf(stderr, "DONE truncated\n");
682 return -1;
683 }
684
685 if (len < 0) {
686
687 if (nl_dump_ext_ack_done(h, len))
688 return len;
689
690 errno = -len;
691 switch (errno) {
692 case ENOENT:
693 case EOPNOTSUPP:
694 return -1;
695 case EMSGSIZE:
696 fprintf(stderr,
697 "Error: Buffer too small for object.\n");
698 break;
699 default:
700 perror("RTNETLINK answers");
701 }
702 return len;
703 }
704
705
706 nl_dump_ext_ack(h, NULL);
707
708 return 0;
709}
710
711static void rtnl_dump_error(const struct rtnl_handle *rth,
712 struct nlmsghdr *h)
713{
714
715 if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
716 fprintf(stderr, "ERROR truncated\n");
717 } else {
718 const struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
719
720 errno = -err->error;
721 if (rth->proto == NETLINK_SOCK_DIAG &&
722 (errno == ENOENT ||
723 errno == EOPNOTSUPP))
724 return;
725
726 if (!(rth->flags & RTNL_HANDLE_F_SUPPRESS_NLERR))
727 perror("RTNETLINK answers");
728 }
729}
730
731static int __rtnl_recvmsg(int fd, struct msghdr *msg, int flags)
732{
733 int len;
734
735 do {
736 len = recvmsg(fd, msg, flags);
737 } while (len < 0 && (errno == EINTR || errno == EAGAIN));
738
739 if (len < 0) {
740 fprintf(stderr, "netlink receive error %s (%d)\n",
741 strerror(errno), errno);
742 return -errno;
743 }
744
745 if (len == 0) {
746 fprintf(stderr, "EOF on netlink\n");
747 return -ENODATA;
748 }
749
750 return len;
751}
752
753static int rtnl_recvmsg(int fd, struct msghdr *msg, char **answer)
754{
755 struct iovec *iov = msg->msg_iov;
756 char *buf;
757 int len;
758
759 iov->iov_base = NULL;
760 iov->iov_len = 0;
761
762 len = __rtnl_recvmsg(fd, msg, MSG_PEEK | MSG_TRUNC);
763 if (len < 0)
764 return len;
765
766 if (len < 32768)
767 len = 32768;
768 buf = malloc(len);
769 if (!buf) {
770 fprintf(stderr, "malloc error: not enough buffer\n");
771 return -ENOMEM;
772 }
773
774 iov->iov_base = buf;
775 iov->iov_len = len;
776
777 len = __rtnl_recvmsg(fd, msg, 0);
778 if (len < 0) {
779 free(buf);
780 return len;
781 }
782
783 if (answer)
784 *answer = buf;
785 else
786 free(buf);
787
788 return len;
789}
790
791static int rtnl_dump_filter_l(struct rtnl_handle *rth,
792 const struct rtnl_dump_filter_arg *arg)
793{
794 struct sockaddr_nl nladdr;
795 struct iovec iov;
796 struct msghdr msg = {
797 .msg_name = &nladdr,
798 .msg_namelen = sizeof(nladdr),
799 .msg_iov = &iov,
800 .msg_iovlen = 1,
801 };
802 char *buf;
803 int dump_intr = 0;
804
805 while (1) {
806 int status;
807 const struct rtnl_dump_filter_arg *a;
808 int found_done = 0;
809 int msglen = 0;
810
811 status = rtnl_recvmsg(rth->fd, &msg, &buf);
812 if (status < 0)
813 return status;
814
815 if (rth->dump_fp)
816 fwrite(buf, 1, NLMSG_ALIGN(status), rth->dump_fp);
817
818 for (a = arg; a->filter; a++) {
819 struct nlmsghdr *h = (struct nlmsghdr *)buf;
820
821 msglen = status;
822
823 while (NLMSG_OK(h, msglen)) {
824 int err = 0;
825
826 h->nlmsg_flags &= ~a->nc_flags;
827
828 if (nladdr.nl_pid != 0 ||
829 h->nlmsg_pid != rth->local.nl_pid ||
830 h->nlmsg_seq != rth->dump)
831 goto skip_it;
832
833 if (h->nlmsg_flags & NLM_F_DUMP_INTR)
834 dump_intr = 1;
835
836 if (h->nlmsg_type == NLMSG_DONE) {
837 err = rtnl_dump_done(h);
838 if (err < 0) {
839 free(buf);
840 return -1;
841 }
842
843 found_done = 1;
844 break;
845 }
846
847 if (h->nlmsg_type == NLMSG_ERROR) {
848 rtnl_dump_error(rth, h);
849 free(buf);
850 return -1;
851 }
852
853 if (!rth->dump_fp) {
854 err = a->filter(h, a->arg1);
855 if (err < 0) {
856 free(buf);
857 return err;
858 }
859 }
860
861skip_it:
862 h = NLMSG_NEXT(h, msglen);
863 }
864 }
865 free(buf);
866
867 if (found_done) {
868 if (dump_intr)
869 fprintf(stderr,
870 "Dump was interrupted and may be inconsistent.\n");
871 return 0;
872 }
873
874 if (msg.msg_flags & MSG_TRUNC) {
875 fprintf(stderr, "Message truncated\n");
876 continue;
877 }
878 if (msglen) {
879 fprintf(stderr, "!!!Remnant of size %d\n", msglen);
880 exit(1);
881 }
882 }
883}
884
885int rtnl_dump_filter_nc(struct rtnl_handle *rth,
886 rtnl_filter_t filter,
887 void *arg1, __u16 nc_flags)
888{
889 const struct rtnl_dump_filter_arg a[2] = {
890 { .filter = filter, .arg1 = arg1, .nc_flags = nc_flags, },
891 { .filter = NULL, .arg1 = NULL, .nc_flags = 0, },
892 };
893
894 return rtnl_dump_filter_l(rth, a);
895}
896
897static void rtnl_talk_error(struct nlmsghdr *h, struct nlmsgerr *err,
898 nl_ext_ack_fn_t errfn)
899{
900 if (nl_dump_ext_ack(h, errfn))
901 return;
902
903 fprintf(stderr, "RTNETLINK answers: %s\n",
904 strerror(-err->error));
905}
906
907
908static int __rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iov,
909 size_t iovlen, struct nlmsghdr **answer,
910 bool show_rtnl_err, nl_ext_ack_fn_t errfn)
911{
912 struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
913 struct iovec riov;
914 struct msghdr msg = {
915 .msg_name = &nladdr,
916 .msg_namelen = sizeof(nladdr),
917 .msg_iov = iov,
918 .msg_iovlen = iovlen,
919 };
920 unsigned int seq = 0;
921 struct nlmsghdr *h;
922 int i, status;
923 char *buf;
924
925 for (i = 0; i < iovlen; i++) {
926 h = iov[i].iov_base;
927 h->nlmsg_seq = seq = ++rtnl->seq;
928 if (answer == NULL)
929 h->nlmsg_flags |= NLM_F_ACK;
930 }
931
932 status = sendmsg(rtnl->fd, &msg, 0);
933 if (status < 0) {
934 perror("Cannot talk to rtnetlink");
935 return -1;
936 }
937
938
939 msg.msg_iov = &riov;
940 msg.msg_iovlen = 1;
941 i = 0;
942 while (1) {
943next:
944 status = rtnl_recvmsg(rtnl->fd, &msg, &buf);
945 ++i;
946
947 if (status < 0)
948 return status;
949
950 if (msg.msg_namelen != sizeof(nladdr)) {
951 fprintf(stderr,
952 "sender address length == %d\n",
953 msg.msg_namelen);
954 exit(1);
955 }
956 for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) {
957 int len = h->nlmsg_len;
958 int l = len - sizeof(*h);
959
960 if (l < 0 || len > status) {
961 if (msg.msg_flags & MSG_TRUNC) {
962 fprintf(stderr, "Truncated message\n");
963 free(buf);
964 return -1;
965 }
966 fprintf(stderr,
967 "!!!malformed message: len=%d\n",
968 len);
969 exit(1);
970 }
971
972 if (nladdr.nl_pid != 0 ||
973 h->nlmsg_pid != rtnl->local.nl_pid ||
974 h->nlmsg_seq > seq || h->nlmsg_seq < seq - iovlen) {
975
976 status -= NLMSG_ALIGN(len);
977 h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
978 continue;
979 }
980
981 if (h->nlmsg_type == NLMSG_ERROR) {
982 struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(h);
983 int error = err->error;
984
985 if (l < sizeof(struct nlmsgerr)) {
986 fprintf(stderr, "ERROR truncated\n");
987 free(buf);
988 return -1;
989 }
990
991 if (!error) {
992
993 nl_dump_ext_ack(h, errfn);
994 } else {
995 errno = -error;
996
997 if (rtnl->proto != NETLINK_SOCK_DIAG &&
998 show_rtnl_err)
999 rtnl_talk_error(h, err, errfn);
1000 }
1001
1002 if (answer)
1003 *answer = (struct nlmsghdr *)buf;
1004 else
1005 free(buf);
1006
1007 if (i < iovlen)
1008 goto next;
1009 return error ? -i : 0;
1010 }
1011
1012 if (answer) {
1013 *answer = (struct nlmsghdr *)buf;
1014 return 0;
1015 }
1016
1017 fprintf(stderr, "Unexpected reply!!!\n");
1018
1019 status -= NLMSG_ALIGN(len);
1020 h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
1021 }
1022 free(buf);
1023
1024 if (msg.msg_flags & MSG_TRUNC) {
1025 fprintf(stderr, "Message truncated\n");
1026 continue;
1027 }
1028
1029 if (status) {
1030 fprintf(stderr, "!!!Remnant of size %d\n", status);
1031 exit(1);
1032 }
1033 }
1034}
1035
1036static int __rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
1037 struct nlmsghdr **answer,
1038 bool show_rtnl_err, nl_ext_ack_fn_t errfn)
1039{
1040 struct iovec iov = {
1041 .iov_base = n,
1042 .iov_len = n->nlmsg_len
1043 };
1044
1045 return __rtnl_talk_iov(rtnl, &iov, 1, answer, show_rtnl_err, errfn);
1046}
1047
1048int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n,
1049 struct nlmsghdr **answer)
1050{
1051 return __rtnl_talk(rtnl, n, answer, true, NULL);
1052}
1053
1054int rtnl_talk_iov(struct rtnl_handle *rtnl, struct iovec *iovec, size_t iovlen,
1055 struct nlmsghdr **answer)
1056{
1057 return __rtnl_talk_iov(rtnl, iovec, iovlen, answer, true, NULL);
1058}
1059
1060int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle *rtnl, struct nlmsghdr *n,
1061 struct nlmsghdr **answer)
1062{
1063 return __rtnl_talk(rtnl, n, answer, false, NULL);
1064}
1065
1066int rtnl_listen_all_nsid(struct rtnl_handle *rth)
1067{
1068 unsigned int on = 1;
1069
1070 if (setsockopt(rth->fd, SOL_NETLINK, NETLINK_LISTEN_ALL_NSID, &on,
1071 sizeof(on)) < 0) {
1072 perror("NETLINK_LISTEN_ALL_NSID");
1073 return -1;
1074 }
1075 rth->flags |= RTNL_HANDLE_F_LISTEN_ALL_NSID;
1076 return 0;
1077}
1078
1079int rtnl_listen(struct rtnl_handle *rtnl,
1080 rtnl_listen_filter_t handler,
1081 void *jarg)
1082{
1083 int status;
1084 struct nlmsghdr *h;
1085 struct sockaddr_nl nladdr = { .nl_family = AF_NETLINK };
1086 struct iovec iov;
1087 struct msghdr msg = {
1088 .msg_name = &nladdr,
1089 .msg_namelen = sizeof(nladdr),
1090 .msg_iov = &iov,
1091 .msg_iovlen = 1,
1092 };
1093 char buf[16384];
1094 char cmsgbuf[BUFSIZ];
1095
1096 if (rtnl->flags & RTNL_HANDLE_F_LISTEN_ALL_NSID) {
1097 msg.msg_control = &cmsgbuf;
1098 msg.msg_controllen = sizeof(cmsgbuf);
1099 }
1100
1101 iov.iov_base = buf;
1102 while (1) {
1103 struct rtnl_ctrl_data ctrl;
1104 struct cmsghdr *cmsg;
1105
1106 iov.iov_len = sizeof(buf);
1107 status = recvmsg(rtnl->fd, &msg, 0);
1108
1109 if (status < 0) {
1110 if (errno == EINTR || errno == EAGAIN)
1111 continue;
1112 fprintf(stderr, "netlink receive error %s (%d)\n",
1113 strerror(errno), errno);
1114 if (errno == ENOBUFS)
1115 continue;
1116 return -1;
1117 }
1118 if (status == 0) {
1119 fprintf(stderr, "EOF on netlink\n");
1120 return -1;
1121 }
1122 if (msg.msg_namelen != sizeof(nladdr)) {
1123 fprintf(stderr,
1124 "Sender address length == %d\n",
1125 msg.msg_namelen);
1126 exit(1);
1127 }
1128
1129 if (rtnl->flags & RTNL_HANDLE_F_LISTEN_ALL_NSID) {
1130 memset(&ctrl, 0, sizeof(ctrl));
1131 ctrl.nsid = -1;
1132 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg;
1133 cmsg = CMSG_NXTHDR(&msg, cmsg))
1134 if (cmsg->cmsg_level == SOL_NETLINK &&
1135 cmsg->cmsg_type == NETLINK_LISTEN_ALL_NSID &&
1136 cmsg->cmsg_len == CMSG_LEN(sizeof(int))) {
1137 int *data = (int *)CMSG_DATA(cmsg);
1138
1139 ctrl.nsid = *data;
1140 }
1141 }
1142
1143 for (h = (struct nlmsghdr *)buf; status >= sizeof(*h); ) {
1144 int err;
1145 int len = h->nlmsg_len;
1146 int l = len - sizeof(*h);
1147
1148 if (l < 0 || len > status) {
1149 if (msg.msg_flags & MSG_TRUNC) {
1150 fprintf(stderr, "Truncated message\n");
1151 return -1;
1152 }
1153 fprintf(stderr,
1154 "!!!malformed message: len=%d\n",
1155 len);
1156 exit(1);
1157 }
1158
1159 err = handler(&ctrl, h, jarg);
1160 if (err < 0)
1161 return err;
1162
1163 status -= NLMSG_ALIGN(len);
1164 h = (struct nlmsghdr *)((char *)h + NLMSG_ALIGN(len));
1165 }
1166 if (msg.msg_flags & MSG_TRUNC) {
1167 fprintf(stderr, "Message truncated\n");
1168 continue;
1169 }
1170 if (status) {
1171 fprintf(stderr, "!!!Remnant of size %d\n", status);
1172 exit(1);
1173 }
1174 }
1175}
1176
1177int rtnl_from_file(FILE *rtnl, rtnl_listen_filter_t handler,
1178 void *jarg)
1179{
1180 size_t status;
1181 char buf[16384];
1182 struct nlmsghdr *h = (struct nlmsghdr *)buf;
1183
1184 while (1) {
1185 int err, len;
1186 int l;
1187
1188 status = fread(&buf, 1, sizeof(*h), rtnl);
1189
1190 if (status == 0 && feof(rtnl))
1191 return 0;
1192 if (status != sizeof(*h)) {
1193 if (ferror(rtnl))
1194 perror("rtnl_from_file: fread");
1195 if (feof(rtnl))
1196 fprintf(stderr, "rtnl-from_file: truncated message\n");
1197 return -1;
1198 }
1199
1200 len = h->nlmsg_len;
1201 l = len - sizeof(*h);
1202
1203 if (l < 0 || len > sizeof(buf)) {
1204 fprintf(stderr, "!!!malformed message: len=%d @%lu\n",
1205 len, ftell(rtnl));
1206 return -1;
1207 }
1208
1209 status = fread(NLMSG_DATA(h), 1, NLMSG_ALIGN(l), rtnl);
1210
1211 if (status != NLMSG_ALIGN(l)) {
1212 if (ferror(rtnl))
1213 perror("rtnl_from_file: fread");
1214 if (feof(rtnl))
1215 fprintf(stderr, "rtnl-from_file: truncated message\n");
1216 return -1;
1217 }
1218
1219 err = handler(NULL, h, jarg);
1220 if (err < 0)
1221 return err;
1222 }
1223}
1224
1225int addattr(struct nlmsghdr *n, int maxlen, int type)
1226{
1227 return addattr_l(n, maxlen, type, NULL, 0);
1228}
1229
1230int addattr8(struct nlmsghdr *n, int maxlen, int type, __u8 data)
1231{
1232 return addattr_l(n, maxlen, type, &data, sizeof(__u8));
1233}
1234
1235int addattr16(struct nlmsghdr *n, int maxlen, int type, __u16 data)
1236{
1237 return addattr_l(n, maxlen, type, &data, sizeof(__u16));
1238}
1239
1240int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data)
1241{
1242 return addattr_l(n, maxlen, type, &data, sizeof(__u32));
1243}
1244
1245int addattr64(struct nlmsghdr *n, int maxlen, int type, __u64 data)
1246{
1247 return addattr_l(n, maxlen, type, &data, sizeof(__u64));
1248}
1249
1250int addattrstrz(struct nlmsghdr *n, int maxlen, int type, const char *str)
1251{
1252 return addattr_l(n, maxlen, type, str, strlen(str)+1);
1253}
1254
1255int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
1256 int alen)
1257{
1258 int len = RTA_LENGTH(alen);
1259 struct rtattr *rta;
1260
1261 if (NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len) > maxlen) {
1262 fprintf(stderr,
1263 "addattr_l ERROR: message exceeded bound of %d\n",
1264 maxlen);
1265 return -1;
1266 }
1267 rta = NLMSG_TAIL(n);
1268 rta->rta_type = type;
1269 rta->rta_len = len;
1270 if (alen)
1271 memcpy(RTA_DATA(rta), data, alen);
1272 n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
1273 return 0;
1274}
1275
1276int addraw_l(struct nlmsghdr *n, int maxlen, const void *data, int len)
1277{
1278 if (NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len) > maxlen) {
1279 fprintf(stderr,
1280 "addraw_l ERROR: message exceeded bound of %d\n",
1281 maxlen);
1282 return -1;
1283 }
1284
1285 memcpy(NLMSG_TAIL(n), data, len);
1286 memset((void *) NLMSG_TAIL(n) + len, 0, NLMSG_ALIGN(len) - len);
1287 n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + NLMSG_ALIGN(len);
1288 return 0;
1289}
1290
1291struct rtattr *addattr_nest(struct nlmsghdr *n, int maxlen, int type)
1292{
1293 struct rtattr *nest = NLMSG_TAIL(n);
1294
1295 addattr_l(n, maxlen, type, NULL, 0);
1296 return nest;
1297}
1298
1299int addattr_nest_end(struct nlmsghdr *n, struct rtattr *nest)
1300{
1301 nest->rta_len = (void *)NLMSG_TAIL(n) - (void *)nest;
1302 return n->nlmsg_len;
1303}
1304
1305struct rtattr *addattr_nest_compat(struct nlmsghdr *n, int maxlen, int type,
1306 const void *data, int len)
1307{
1308 struct rtattr *start = NLMSG_TAIL(n);
1309
1310 addattr_l(n, maxlen, type, data, len);
1311 addattr_nest(n, maxlen, type);
1312 return start;
1313}
1314
1315int addattr_nest_compat_end(struct nlmsghdr *n, struct rtattr *start)
1316{
1317 struct rtattr *nest = (void *)start + NLMSG_ALIGN(start->rta_len);
1318
1319 start->rta_len = (void *)NLMSG_TAIL(n) - (void *)start;
1320 addattr_nest_end(n, nest);
1321 return n->nlmsg_len;
1322}
1323
1324int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data)
1325{
1326 int len = RTA_LENGTH(4);
1327 struct rtattr *subrta;
1328
1329 if (RTA_ALIGN(rta->rta_len) + len > maxlen) {
1330 fprintf(stderr,
1331 "rta_addattr32: Error! max allowed bound %d exceeded\n",
1332 maxlen);
1333 return -1;
1334 }
1335 subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len));
1336 subrta->rta_type = type;
1337 subrta->rta_len = len;
1338 memcpy(RTA_DATA(subrta), &data, 4);
1339 rta->rta_len = NLMSG_ALIGN(rta->rta_len) + len;
1340 return 0;
1341}
1342
1343int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
1344 const void *data, int alen)
1345{
1346 struct rtattr *subrta;
1347 int len = RTA_LENGTH(alen);
1348
1349 if (RTA_ALIGN(rta->rta_len) + RTA_ALIGN(len) > maxlen) {
1350 fprintf(stderr,
1351 "rta_addattr_l: Error! max allowed bound %d exceeded\n",
1352 maxlen);
1353 return -1;
1354 }
1355 subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len));
1356 subrta->rta_type = type;
1357 subrta->rta_len = len;
1358 if (alen)
1359 memcpy(RTA_DATA(subrta), data, alen);
1360 rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len);
1361 return 0;
1362}
1363
1364int rta_addattr8(struct rtattr *rta, int maxlen, int type, __u8 data)
1365{
1366 return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u8));
1367}
1368
1369int rta_addattr16(struct rtattr *rta, int maxlen, int type, __u16 data)
1370{
1371 return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u16));
1372}
1373
1374int rta_addattr64(struct rtattr *rta, int maxlen, int type, __u64 data)
1375{
1376 return rta_addattr_l(rta, maxlen, type, &data, sizeof(__u64));
1377}
1378
1379struct rtattr *rta_nest(struct rtattr *rta, int maxlen, int type)
1380{
1381 struct rtattr *nest = RTA_TAIL(rta);
1382
1383 rta_addattr_l(rta, maxlen, type, NULL, 0);
1384 nest->rta_type |= NLA_F_NESTED;
1385
1386 return nest;
1387}
1388
1389int rta_nest_end(struct rtattr *rta, struct rtattr *nest)
1390{
1391 nest->rta_len = (void *)RTA_TAIL(rta) - (void *)nest;
1392
1393 return rta->rta_len;
1394}
1395
1396int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
1397{
1398 return parse_rtattr_flags(tb, max, rta, len, 0);
1399}
1400
1401int parse_rtattr_flags(struct rtattr *tb[], int max, struct rtattr *rta,
1402 int len, unsigned short flags)
1403{
1404 unsigned short type;
1405
1406 memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
1407 while (RTA_OK(rta, len)) {
1408 type = rta->rta_type & ~flags;
1409 if ((type <= max) && (!tb[type]))
1410 tb[type] = rta;
1411 rta = RTA_NEXT(rta, len);
1412 }
1413 if (len)
1414 fprintf(stderr, "!!!Deficit %d, rta_len=%d\n",
1415 len, rta->rta_len);
1416 return 0;
1417}
1418
1419struct rtattr *parse_rtattr_one(int type, struct rtattr *rta, int len)
1420{
1421 while (RTA_OK(rta, len)) {
1422 if (rta->rta_type == type)
1423 return rta;
1424 rta = RTA_NEXT(rta, len);
1425 }
1426
1427 if (len)
1428 fprintf(stderr, "!!!Deficit %d, rta_len=%d\n",
1429 len, rta->rta_len);
1430 return NULL;
1431}
1432
1433int __parse_rtattr_nested_compat(struct rtattr *tb[], int max,
1434 struct rtattr *rta,
1435 int len)
1436{
1437 if (RTA_PAYLOAD(rta) < len)
1438 return -1;
1439 if (RTA_PAYLOAD(rta) >= RTA_ALIGN(len) + sizeof(struct rtattr)) {
1440 rta = RTA_DATA(rta) + RTA_ALIGN(len);
1441 return parse_rtattr_nested(tb, max, rta);
1442 }
1443 memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
1444 return 0;
1445}
1446
1447static const char *get_nla_type_str(unsigned int attr)
1448{
1449 switch (attr) {
1450#define C(x) case NL_ATTR_TYPE_ ## x: return #x
1451 C(U8);
1452 C(U16);
1453 C(U32);
1454 C(U64);
1455 C(STRING);
1456 C(FLAG);
1457 C(NESTED);
1458 C(NESTED_ARRAY);
1459 C(NUL_STRING);
1460 C(BINARY);
1461 C(S8);
1462 C(S16);
1463 C(S32);
1464 C(S64);
1465 C(BITFIELD32);
1466 default:
1467 return "unknown";
1468 }
1469}
1470
1471void nl_print_policy(const struct rtattr *attr, FILE *fp)
1472{
1473 const struct rtattr *pos;
1474
1475 rtattr_for_each_nested(pos, attr) {
1476 const struct rtattr *attr;
1477
1478 fprintf(fp, " policy[%u]:", pos->rta_type & ~NLA_F_NESTED);
1479
1480 rtattr_for_each_nested(attr, pos) {
1481 struct rtattr *tp[NL_POLICY_TYPE_ATTR_MAX + 1];
1482
1483 parse_rtattr_nested(tp, ARRAY_SIZE(tp) - 1, attr);
1484
1485 if (tp[NL_POLICY_TYPE_ATTR_TYPE])
1486 fprintf(fp, "attr[%u]: type=%s",
1487 attr->rta_type & ~NLA_F_NESTED,
1488 get_nla_type_str(rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_TYPE])));
1489
1490 if (tp[NL_POLICY_TYPE_ATTR_POLICY_IDX])
1491 fprintf(fp, " policy:%u",
1492 rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_POLICY_IDX]));
1493
1494 if (tp[NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE])
1495 fprintf(fp, " maxattr:%u",
1496 rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_POLICY_MAXTYPE]));
1497
1498 if (tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_S] && tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_S])
1499 fprintf(fp, " range:[%lld,%lld]",
1500 (signed long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_S]),
1501 (signed long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_S]));
1502
1503 if (tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_U] && tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_U])
1504 fprintf(fp, " range:[%llu,%llu]",
1505 (unsigned long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MIN_VALUE_U]),
1506 (unsigned long long)rta_getattr_u64(tp[NL_POLICY_TYPE_ATTR_MAX_VALUE_U]));
1507
1508 if (tp[NL_POLICY_TYPE_ATTR_MIN_LENGTH])
1509 fprintf(fp, " min len:%u",
1510 rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_MIN_LENGTH]));
1511
1512 if (tp[NL_POLICY_TYPE_ATTR_MAX_LENGTH])
1513 fprintf(fp, " max len:%u",
1514 rta_getattr_u32(tp[NL_POLICY_TYPE_ATTR_MAX_LENGTH]));
1515 }
1516 }
1517}
1518
