2 * libnetlink.c RTnetlink service routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
18 #include <net/if_arp.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
25 #include <linux/fib_rules.h>
26 #include <linux/if_addrlabel.h>
27 #include <linux/if_bridge.h>
29 #include "libnetlink.h"
32 #define SOL_NETLINK 270
36 #define MIN(a, b) ((a) < (b) ? (a) : (b))
39 int rcvbuf
= 1024 * 1024;
42 #include <libmnl/libmnl.h>
44 static const enum mnl_attr_data_type extack_policy
[NLMSGERR_ATTR_MAX
+ 1] = {
45 [NLMSGERR_ATTR_MSG
] = MNL_TYPE_NUL_STRING
,
46 [NLMSGERR_ATTR_OFFS
] = MNL_TYPE_U32
,
49 static int err_attr_cb(const struct nlattr
*attr
, void *data
)
51 const struct nlattr
**tb
= data
;
54 if (mnl_attr_type_valid(attr
, NLMSGERR_ATTR_MAX
) < 0) {
55 fprintf(stderr
, "Invalid extack attribute\n");
59 type
= mnl_attr_get_type(attr
);
60 if (mnl_attr_validate(attr
, extack_policy
[type
]) < 0) {
61 fprintf(stderr
, "extack attribute %d failed validation\n",
70 /* dump netlink extended ack error message */
71 int nl_dump_ext_ack(const struct nlmsghdr
*nlh
, nl_ext_ack_fn_t errfn
)
73 struct nlattr
*tb
[NLMSGERR_ATTR_MAX
+ 1] = {};
74 const struct nlmsgerr
*err
= mnl_nlmsg_get_payload(nlh
);
75 const struct nlmsghdr
*err_nlh
= NULL
;
76 unsigned int hlen
= sizeof(*err
);
77 const char *msg
= NULL
;
80 /* no TLVs, nothing to do here */
81 if (!(nlh
->nlmsg_flags
& NLM_F_ACK_TLVS
))
84 /* if NLM_F_CAPPED is set then the inner err msg was capped */
85 if (!(nlh
->nlmsg_flags
& NLM_F_CAPPED
))
86 hlen
+= mnl_nlmsg_get_payload_len(&err
->msg
);
88 if (mnl_attr_parse(nlh
, hlen
, err_attr_cb
, tb
) != MNL_CB_OK
)
91 if (tb
[NLMSGERR_ATTR_MSG
])
92 msg
= mnl_attr_get_str(tb
[NLMSGERR_ATTR_MSG
]);
94 if (tb
[NLMSGERR_ATTR_OFFS
]) {
95 off
= mnl_attr_get_u32(tb
[NLMSGERR_ATTR_OFFS
]);
97 if (off
> nlh
->nlmsg_len
) {
99 "Invalid offset for NLMSGERR_ATTR_OFFS\n");
101 } else if (!(nlh
->nlmsg_flags
& NLM_F_CAPPED
))
106 return errfn(msg
, off
, err_nlh
);
108 if (msg
&& *msg
!= '\0') {
109 bool is_err
= !!err
->error
;
111 fprintf(stderr
, "%s: %s",
112 is_err
? "Error" : "Warning", msg
);
113 if (msg
[strlen(msg
) - 1] != '.')
114 fprintf(stderr
, ".");
115 fprintf(stderr
, "\n");
117 return is_err
? 1 : 0;
123 #warning "libmnl required for error support"
125 /* No extended error ack without libmnl */
126 int nl_dump_ext_ack(const struct nlmsghdr
*nlh
, nl_ext_ack_fn_t errfn
)
132 void rtnl_close(struct rtnl_handle
*rth
)
140 int rtnl_open_byproto(struct rtnl_handle
*rth
, unsigned int subscriptions
,
147 memset(rth
, 0, sizeof(*rth
));
149 rth
->proto
= protocol
;
150 rth
->fd
= socket(AF_NETLINK
, SOCK_RAW
| SOCK_CLOEXEC
, protocol
);
152 perror("Cannot open netlink socket");
156 if (setsockopt(rth
->fd
, SOL_SOCKET
, SO_SNDBUF
,
157 &sndbuf
, sizeof(sndbuf
)) < 0) {
162 if (setsockopt(rth
->fd
, SOL_SOCKET
, SO_RCVBUF
,
163 &rcvbuf
, sizeof(rcvbuf
)) < 0) {
168 /* Older kernels may no support extended ACK reporting */
169 setsockopt(rth
->fd
, SOL_NETLINK
, NETLINK_EXT_ACK
,
172 memset(&rth
->local
, 0, sizeof(rth
->local
));
173 rth
->local
.nl_family
= AF_NETLINK
;
174 rth
->local
.nl_groups
= subscriptions
;
176 if (bind(rth
->fd
, (struct sockaddr
*)&rth
->local
,
177 sizeof(rth
->local
)) < 0) {
178 perror("Cannot bind netlink socket");
181 addr_len
= sizeof(rth
->local
);
182 if (getsockname(rth
->fd
, (struct sockaddr
*)&rth
->local
,
184 perror("Cannot getsockname");
187 if (addr_len
!= sizeof(rth
->local
)) {
188 fprintf(stderr
, "Wrong address length %d\n", addr_len
);
191 if (rth
->local
.nl_family
!= AF_NETLINK
) {
192 fprintf(stderr
, "Wrong address family %d\n",
193 rth
->local
.nl_family
);
196 rth
->seq
= time(NULL
);
200 int rtnl_open(struct rtnl_handle
*rth
, unsigned int subscriptions
)
202 return rtnl_open_byproto(rth
, subscriptions
, NETLINK_ROUTE
);
205 int rtnl_addrdump_req(struct rtnl_handle
*rth
, int family
)
209 struct ifaddrmsg ifm
;
211 .nlh
.nlmsg_len
= sizeof(req
),
212 .nlh
.nlmsg_type
= RTM_GETADDR
,
213 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
214 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
215 .ifm
.ifa_family
= family
,
218 return send(rth
->fd
, &req
, sizeof(req
), 0);
221 int rtnl_addrlbldump_req(struct rtnl_handle
*rth
, int family
)
225 struct ifaddrlblmsg ifal
;
227 .nlh
.nlmsg_len
= sizeof(req
),
228 .nlh
.nlmsg_type
= RTM_GETADDRLABEL
,
229 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
230 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
231 .ifal
.ifal_family
= family
,
234 return send(rth
->fd
, &req
, sizeof(req
), 0);
237 int rtnl_routedump_req(struct rtnl_handle
*rth
, int family
)
243 .nlh
.nlmsg_len
= sizeof(req
),
244 .nlh
.nlmsg_type
= RTM_GETROUTE
,
245 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
246 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
247 .rtm
.rtm_family
= family
,
250 return send(rth
->fd
, &req
, sizeof(req
), 0);
253 int rtnl_ruledump_req(struct rtnl_handle
*rth
, int family
)
257 struct fib_rule_hdr frh
;
259 .nlh
.nlmsg_len
= sizeof(req
),
260 .nlh
.nlmsg_type
= RTM_GETRULE
,
261 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
262 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
266 return send(rth
->fd
, &req
, sizeof(req
), 0);
269 int rtnl_neighdump_req(struct rtnl_handle
*rth
, int family
)
275 .nlh
.nlmsg_len
= sizeof(req
),
276 .nlh
.nlmsg_type
= RTM_GETNEIGH
,
277 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
278 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
279 .ndm
.ndm_family
= family
,
282 return send(rth
->fd
, &req
, sizeof(req
), 0);
285 int rtnl_neightbldump_req(struct rtnl_handle
*rth
, int family
)
289 struct ndtmsg ndtmsg
;
291 .nlh
.nlmsg_len
= sizeof(req
),
292 .nlh
.nlmsg_type
= RTM_GETNEIGHTBL
,
293 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
294 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
295 .ndtmsg
.ndtm_family
= family
,
298 return send(rth
->fd
, &req
, sizeof(req
), 0);
301 int rtnl_mdbdump_req(struct rtnl_handle
*rth
, int family
)
305 struct br_port_msg bpm
;
307 .nlh
.nlmsg_len
= sizeof(req
),
308 .nlh
.nlmsg_type
= RTM_GETMDB
,
309 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
310 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
311 .bpm
.family
= family
,
314 return send(rth
->fd
, &req
, sizeof(req
), 0);
317 int rtnl_netconfdump_req(struct rtnl_handle
*rth
, int family
)
321 struct netconfmsg ncm
;
323 .nlh
.nlmsg_len
= sizeof(req
),
324 .nlh
.nlmsg_type
= RTM_GETNETCONF
,
325 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
326 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
327 .ncm
.ncm_family
= family
,
330 return send(rth
->fd
, &req
, sizeof(req
), 0);
333 int rtnl_nsiddump_req(struct rtnl_handle
*rth
, int family
)
339 .nlh
.nlmsg_len
= sizeof(req
),
340 .nlh
.nlmsg_type
= RTM_GETNSID
,
341 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
342 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
343 .rtm
.rtgen_family
= family
,
346 return send(rth
->fd
, &req
, sizeof(req
), 0);
349 int rtnl_linkdump_req(struct rtnl_handle
*rth
, int family
)
351 return rtnl_linkdump_req_filter(rth
, family
, RTEXT_FILTER_VF
);
354 int rtnl_linkdump_req_filter(struct rtnl_handle
*rth
, int family
,
359 struct ifinfomsg ifm
;
360 /* attribute has to be NLMSG aligned */
361 struct rtattr ext_req
__attribute__ ((aligned(NLMSG_ALIGNTO
)));
362 __u32 ext_filter_mask
;
364 .nlh
.nlmsg_len
= sizeof(req
),
365 .nlh
.nlmsg_type
= RTM_GETLINK
,
366 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
367 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
368 .ifm
.ifi_family
= family
,
369 .ext_req
.rta_type
= IFLA_EXT_MASK
,
370 .ext_req
.rta_len
= RTA_LENGTH(sizeof(__u32
)),
371 .ext_filter_mask
= filt_mask
,
374 return send(rth
->fd
, &req
, sizeof(req
), 0);
377 int rtnl_linkdump_req_filter_fn(struct rtnl_handle
*rth
, int family
,
378 req_filter_fn_t filter_fn
)
382 struct ifinfomsg ifm
;
385 .nlh
.nlmsg_len
= NLMSG_LENGTH(sizeof(struct ifinfomsg
)),
386 .nlh
.nlmsg_type
= RTM_GETLINK
,
387 .nlh
.nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
388 .nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
,
389 .ifm
.ifi_family
= family
,
396 err
= filter_fn(&req
.nlh
, sizeof(req
));
400 return send(rth
->fd
, &req
, req
.nlh
.nlmsg_len
, 0);
403 int rtnl_statsdump_req_filter(struct rtnl_handle
*rth
, int fam
, __u32 filt_mask
)
407 struct if_stats_msg ifsm
;
410 memset(&req
, 0, sizeof(req
));
411 req
.nlh
.nlmsg_len
= NLMSG_LENGTH(sizeof(struct if_stats_msg
));
412 req
.nlh
.nlmsg_type
= RTM_GETSTATS
;
413 req
.nlh
.nlmsg_flags
= NLM_F_DUMP
|NLM_F_REQUEST
;
414 req
.nlh
.nlmsg_pid
= 0;
415 req
.nlh
.nlmsg_seq
= rth
->dump
= ++rth
->seq
;
416 req
.ifsm
.family
= fam
;
417 req
.ifsm
.filter_mask
= filt_mask
;
419 return send(rth
->fd
, &req
, sizeof(req
), 0);
422 int rtnl_send(struct rtnl_handle
*rth
, const void *buf
, int len
)
424 return send(rth
->fd
, buf
, len
, 0);
427 int rtnl_send_check(struct rtnl_handle
*rth
, const void *buf
, int len
)
433 status
= send(rth
->fd
, buf
, len
, 0);
437 /* Check for immediate errors */
438 status
= recv(rth
->fd
, resp
, sizeof(resp
), MSG_DONTWAIT
|MSG_PEEK
);
445 for (h
= (struct nlmsghdr
*)resp
; NLMSG_OK(h
, status
);
446 h
= NLMSG_NEXT(h
, status
)) {
447 if (h
->nlmsg_type
== NLMSG_ERROR
) {
448 struct nlmsgerr
*err
= (struct nlmsgerr
*)NLMSG_DATA(h
);
450 if (h
->nlmsg_len
< NLMSG_LENGTH(sizeof(struct nlmsgerr
)))
451 fprintf(stderr
, "ERROR truncated\n");
461 int rtnl_dump_request(struct rtnl_handle
*rth
, int type
, void *req
, int len
)
463 struct nlmsghdr nlh
= {
464 .nlmsg_len
= NLMSG_LENGTH(len
),
466 .nlmsg_flags
= NLM_F_DUMP
| NLM_F_REQUEST
,
467 .nlmsg_seq
= rth
->dump
= ++rth
->seq
,
469 struct sockaddr_nl nladdr
= { .nl_family
= AF_NETLINK
};
470 struct iovec iov
[2] = {
471 { .iov_base
= &nlh
, .iov_len
= sizeof(nlh
) },
472 { .iov_base
= req
, .iov_len
= len
}
474 struct msghdr msg
= {
476 .msg_namelen
= sizeof(nladdr
),
481 return sendmsg(rth
->fd
, &msg
, 0);
484 int rtnl_dump_request_n(struct rtnl_handle
*rth
, struct nlmsghdr
*n
)
486 struct sockaddr_nl nladdr
= { .nl_family
= AF_NETLINK
};
489 .iov_len
= n
->nlmsg_len
491 struct msghdr msg
= {
493 .msg_namelen
= sizeof(nladdr
),
498 n
->nlmsg_flags
= NLM_F_DUMP
|NLM_F_REQUEST
;
500 n
->nlmsg_seq
= rth
->dump
= ++rth
->seq
;
502 return sendmsg(rth
->fd
, &msg
, 0);
505 static int rtnl_dump_done(struct nlmsghdr
*h
)
507 int len
= *(int *)NLMSG_DATA(h
);
509 if (h
->nlmsg_len
< NLMSG_LENGTH(sizeof(int))) {
510 fprintf(stderr
, "DONE truncated\n");
522 "Error: Buffer too small for object.\n");
525 perror("RTNETLINK answers");
530 /* check for any messages returned from kernel */
531 nl_dump_ext_ack(h
, NULL
);
536 static void rtnl_dump_error(const struct rtnl_handle
*rth
,
540 if (h
->nlmsg_len
< NLMSG_LENGTH(sizeof(struct nlmsgerr
))) {
541 fprintf(stderr
, "ERROR truncated\n");
543 const struct nlmsgerr
*err
= (struct nlmsgerr
*)NLMSG_DATA(h
);
546 if (rth
->proto
== NETLINK_SOCK_DIAG
&&
548 errno
== EOPNOTSUPP
))
551 if (!(rth
->flags
& RTNL_HANDLE_F_SUPPRESS_NLERR
))
552 perror("RTNETLINK answers");
556 static int __rtnl_recvmsg(int fd
, struct msghdr
*msg
, int flags
)
561 len
= recvmsg(fd
, msg
, flags
);
562 } while (len
< 0 && (errno
== EINTR
|| errno
== EAGAIN
));
565 fprintf(stderr
, "netlink receive error %s (%d)\n",
566 strerror(errno
), errno
);
571 fprintf(stderr
, "EOF on netlink\n");
578 static int rtnl_recvmsg(int fd
, struct msghdr
*msg
, char **answer
)
580 struct iovec
*iov
= msg
->msg_iov
;
584 iov
->iov_base
= NULL
;
587 len
= __rtnl_recvmsg(fd
, msg
, MSG_PEEK
| MSG_TRUNC
);
593 fprintf(stderr
, "malloc error: not enough buffer\n");
600 len
= __rtnl_recvmsg(fd
, msg
, 0);
614 static int rtnl_dump_filter_l(struct rtnl_handle
*rth
,
615 const struct rtnl_dump_filter_arg
*arg
)
617 struct sockaddr_nl nladdr
;
619 struct msghdr msg
= {
621 .msg_namelen
= sizeof(nladdr
),
630 const struct rtnl_dump_filter_arg
*a
;
634 status
= rtnl_recvmsg(rth
->fd
, &msg
, &buf
);
639 fwrite(buf
, 1, NLMSG_ALIGN(status
), rth
->dump_fp
);
641 for (a
= arg
; a
->filter
; a
++) {
642 struct nlmsghdr
*h
= (struct nlmsghdr
*)buf
;
646 while (NLMSG_OK(h
, msglen
)) {
649 h
->nlmsg_flags
&= ~a
->nc_flags
;
651 if (nladdr
.nl_pid
!= 0 ||
652 h
->nlmsg_pid
!= rth
->local
.nl_pid
||
653 h
->nlmsg_seq
!= rth
->dump
)
656 if (h
->nlmsg_flags
& NLM_F_DUMP_INTR
)
659 if (h
->nlmsg_type
== NLMSG_DONE
) {
660 err
= rtnl_dump_done(h
);
667 break; /* process next filter */
670 if (h
->nlmsg_type
== NLMSG_ERROR
) {
671 rtnl_dump_error(rth
, h
);
677 err
= a
->filter(h
, a
->arg1
);
685 h
= NLMSG_NEXT(h
, msglen
);
693 "Dump was interrupted and may be inconsistent.\n");
697 if (msg
.msg_flags
& MSG_TRUNC
) {
698 fprintf(stderr
, "Message truncated\n");
702 fprintf(stderr
, "!!!Remnant of size %d\n", msglen
);
708 int rtnl_dump_filter_nc(struct rtnl_handle
*rth
,
709 rtnl_filter_t filter
,
710 void *arg1
, __u16 nc_flags
)
712 const struct rtnl_dump_filter_arg a
[2] = {
713 { .filter
= filter
, .arg1
= arg1
, .nc_flags
= nc_flags
, },
714 { .filter
= NULL
, .arg1
= NULL
, .nc_flags
= 0, },
717 return rtnl_dump_filter_l(rth
, a
);
720 static void rtnl_talk_error(struct nlmsghdr
*h
, struct nlmsgerr
*err
,
721 nl_ext_ack_fn_t errfn
)
723 if (nl_dump_ext_ack(h
, errfn
))
726 fprintf(stderr
, "RTNETLINK answers: %s\n",
727 strerror(-err
->error
));
731 static int __rtnl_talk_iov(struct rtnl_handle
*rtnl
, struct iovec
*iov
,
732 size_t iovlen
, struct nlmsghdr
**answer
,
733 bool show_rtnl_err
, nl_ext_ack_fn_t errfn
)
735 struct sockaddr_nl nladdr
= { .nl_family
= AF_NETLINK
};
737 struct msghdr msg
= {
739 .msg_namelen
= sizeof(nladdr
),
741 .msg_iovlen
= iovlen
,
743 unsigned int seq
= 0;
748 for (i
= 0; i
< iovlen
; i
++) {
750 h
->nlmsg_seq
= seq
= ++rtnl
->seq
;
752 h
->nlmsg_flags
|= NLM_F_ACK
;
755 status
= sendmsg(rtnl
->fd
, &msg
, 0);
757 perror("Cannot talk to rtnetlink");
761 /* change msg to use the response iov */
766 status
= rtnl_recvmsg(rtnl
->fd
, &msg
, &buf
);
772 if (msg
.msg_namelen
!= sizeof(nladdr
)) {
774 "sender address length == %d\n",
778 for (h
= (struct nlmsghdr
*)buf
; status
>= sizeof(*h
); ) {
779 int len
= h
->nlmsg_len
;
780 int l
= len
- sizeof(*h
);
782 if (l
< 0 || len
> status
) {
783 if (msg
.msg_flags
& MSG_TRUNC
) {
784 fprintf(stderr
, "Truncated message\n");
789 "!!!malformed message: len=%d\n",
794 if (nladdr
.nl_pid
!= 0 ||
795 h
->nlmsg_pid
!= rtnl
->local
.nl_pid
||
796 h
->nlmsg_seq
> seq
|| h
->nlmsg_seq
< seq
- iovlen
) {
797 /* Don't forget to skip that message. */
798 status
-= NLMSG_ALIGN(len
);
799 h
= (struct nlmsghdr
*)((char *)h
+ NLMSG_ALIGN(len
));
803 if (h
->nlmsg_type
== NLMSG_ERROR
) {
804 struct nlmsgerr
*err
= (struct nlmsgerr
*)NLMSG_DATA(h
);
805 int error
= err
->error
;
807 if (l
< sizeof(struct nlmsgerr
)) {
808 fprintf(stderr
, "ERROR truncated\n");
814 /* check messages from kernel */
815 nl_dump_ext_ack(h
, errfn
);
819 if (rtnl
->proto
!= NETLINK_SOCK_DIAG
&&
821 rtnl_talk_error(h
, err
, errfn
);
825 *answer
= (struct nlmsghdr
*)buf
;
829 return error
? -i
: 0;
833 *answer
= (struct nlmsghdr
*)buf
;
837 fprintf(stderr
, "Unexpected reply!!!\n");
839 status
-= NLMSG_ALIGN(len
);
840 h
= (struct nlmsghdr
*)((char *)h
+ NLMSG_ALIGN(len
));
844 if (msg
.msg_flags
& MSG_TRUNC
) {
845 fprintf(stderr
, "Message truncated\n");
850 fprintf(stderr
, "!!!Remnant of size %d\n", status
);
856 static int __rtnl_talk(struct rtnl_handle
*rtnl
, struct nlmsghdr
*n
,
857 struct nlmsghdr
**answer
,
858 bool show_rtnl_err
, nl_ext_ack_fn_t errfn
)
862 .iov_len
= n
->nlmsg_len
865 return __rtnl_talk_iov(rtnl
, &iov
, 1, answer
, show_rtnl_err
, errfn
);
868 int rtnl_talk(struct rtnl_handle
*rtnl
, struct nlmsghdr
*n
,
869 struct nlmsghdr
**answer
)
871 return __rtnl_talk(rtnl
, n
, answer
, true, NULL
);
874 int rtnl_talk_iov(struct rtnl_handle
*rtnl
, struct iovec
*iovec
, size_t iovlen
,
875 struct nlmsghdr
**answer
)
877 return __rtnl_talk_iov(rtnl
, iovec
, iovlen
, answer
, true, NULL
);
880 int rtnl_talk_suppress_rtnl_errmsg(struct rtnl_handle
*rtnl
, struct nlmsghdr
*n
,
881 struct nlmsghdr
**answer
)
883 return __rtnl_talk(rtnl
, n
, answer
, false, NULL
);
886 int rtnl_listen_all_nsid(struct rtnl_handle
*rth
)
890 if (setsockopt(rth
->fd
, SOL_NETLINK
, NETLINK_LISTEN_ALL_NSID
, &on
,
892 perror("NETLINK_LISTEN_ALL_NSID");
895 rth
->flags
|= RTNL_HANDLE_F_LISTEN_ALL_NSID
;
899 int rtnl_listen(struct rtnl_handle
*rtnl
,
900 rtnl_listen_filter_t handler
,
905 struct sockaddr_nl nladdr
= { .nl_family
= AF_NETLINK
};
907 struct msghdr msg
= {
909 .msg_namelen
= sizeof(nladdr
),
914 char cmsgbuf
[BUFSIZ
];
916 if (rtnl
->flags
& RTNL_HANDLE_F_LISTEN_ALL_NSID
) {
917 msg
.msg_control
= &cmsgbuf
;
918 msg
.msg_controllen
= sizeof(cmsgbuf
);
923 struct rtnl_ctrl_data ctrl
;
924 struct cmsghdr
*cmsg
;
926 iov
.iov_len
= sizeof(buf
);
927 status
= recvmsg(rtnl
->fd
, &msg
, 0);
930 if (errno
== EINTR
|| errno
== EAGAIN
)
932 fprintf(stderr
, "netlink receive error %s (%d)\n",
933 strerror(errno
), errno
);
934 if (errno
== ENOBUFS
)
939 fprintf(stderr
, "EOF on netlink\n");
942 if (msg
.msg_namelen
!= sizeof(nladdr
)) {
944 "Sender address length == %d\n",
949 if (rtnl
->flags
& RTNL_HANDLE_F_LISTEN_ALL_NSID
) {
950 memset(&ctrl
, 0, sizeof(ctrl
));
952 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
;
953 cmsg
= CMSG_NXTHDR(&msg
, cmsg
))
954 if (cmsg
->cmsg_level
== SOL_NETLINK
&&
955 cmsg
->cmsg_type
== NETLINK_LISTEN_ALL_NSID
&&
956 cmsg
->cmsg_len
== CMSG_LEN(sizeof(int))) {
957 int *data
= (int *)CMSG_DATA(cmsg
);
963 for (h
= (struct nlmsghdr
*)buf
; status
>= sizeof(*h
); ) {
965 int len
= h
->nlmsg_len
;
966 int l
= len
- sizeof(*h
);
968 if (l
< 0 || len
> status
) {
969 if (msg
.msg_flags
& MSG_TRUNC
) {
970 fprintf(stderr
, "Truncated message\n");
974 "!!!malformed message: len=%d\n",
979 err
= handler(&ctrl
, h
, jarg
);
983 status
-= NLMSG_ALIGN(len
);
984 h
= (struct nlmsghdr
*)((char *)h
+ NLMSG_ALIGN(len
));
986 if (msg
.msg_flags
& MSG_TRUNC
) {
987 fprintf(stderr
, "Message truncated\n");
991 fprintf(stderr
, "!!!Remnant of size %d\n", status
);
997 int rtnl_from_file(FILE *rtnl
, rtnl_listen_filter_t handler
,
1002 struct nlmsghdr
*h
= (struct nlmsghdr
*)buf
;
1008 status
= fread(&buf
, 1, sizeof(*h
), rtnl
);
1013 perror("rtnl_from_file: fread");
1020 l
= len
- sizeof(*h
);
1022 if (l
< 0 || len
> sizeof(buf
)) {
1023 fprintf(stderr
, "!!!malformed message: len=%d @%lu\n",
1028 status
= fread(NLMSG_DATA(h
), 1, NLMSG_ALIGN(l
), rtnl
);
1031 perror("rtnl_from_file: fread");
1035 fprintf(stderr
, "rtnl-from_file: truncated message\n");
1039 err
= handler(NULL
, h
, jarg
);
1045 int addattr(struct nlmsghdr
*n
, int maxlen
, int type
)
1047 return addattr_l(n
, maxlen
, type
, NULL
, 0);
1050 int addattr8(struct nlmsghdr
*n
, int maxlen
, int type
, __u8 data
)
1052 return addattr_l(n
, maxlen
, type
, &data
, sizeof(__u8
));
1055 int addattr16(struct nlmsghdr
*n
, int maxlen
, int type
, __u16 data
)
1057 return addattr_l(n
, maxlen
, type
, &data
, sizeof(__u16
));
1060 int addattr32(struct nlmsghdr
*n
, int maxlen
, int type
, __u32 data
)
1062 return addattr_l(n
, maxlen
, type
, &data
, sizeof(__u32
));
1065 int addattr64(struct nlmsghdr
*n
, int maxlen
, int type
, __u64 data
)
1067 return addattr_l(n
, maxlen
, type
, &data
, sizeof(__u64
));
1070 int addattrstrz(struct nlmsghdr
*n
, int maxlen
, int type
, const char *str
)
1072 return addattr_l(n
, maxlen
, type
, str
, strlen(str
)+1);
1075 int addattr_l(struct nlmsghdr
*n
, int maxlen
, int type
, const void *data
,
1078 int len
= RTA_LENGTH(alen
);
1081 if (NLMSG_ALIGN(n
->nlmsg_len
) + RTA_ALIGN(len
) > maxlen
) {
1083 "addattr_l ERROR: message exceeded bound of %d\n",
1087 rta
= NLMSG_TAIL(n
);
1088 rta
->rta_type
= type
;
1091 memcpy(RTA_DATA(rta
), data
, alen
);
1092 n
->nlmsg_len
= NLMSG_ALIGN(n
->nlmsg_len
) + RTA_ALIGN(len
);
1096 int addraw_l(struct nlmsghdr
*n
, int maxlen
, const void *data
, int len
)
1098 if (NLMSG_ALIGN(n
->nlmsg_len
) + NLMSG_ALIGN(len
) > maxlen
) {
1100 "addraw_l ERROR: message exceeded bound of %d\n",
1105 memcpy(NLMSG_TAIL(n
), data
, len
);
1106 memset((void *) NLMSG_TAIL(n
) + len
, 0, NLMSG_ALIGN(len
) - len
);
1107 n
->nlmsg_len
= NLMSG_ALIGN(n
->nlmsg_len
) + NLMSG_ALIGN(len
);
1111 struct rtattr
*addattr_nest(struct nlmsghdr
*n
, int maxlen
, int type
)
1113 struct rtattr
*nest
= NLMSG_TAIL(n
);
1115 addattr_l(n
, maxlen
, type
, NULL
, 0);
1119 int addattr_nest_end(struct nlmsghdr
*n
, struct rtattr
*nest
)
1121 nest
->rta_len
= (void *)NLMSG_TAIL(n
) - (void *)nest
;
1122 return n
->nlmsg_len
;
1125 struct rtattr
*addattr_nest_compat(struct nlmsghdr
*n
, int maxlen
, int type
,
1126 const void *data
, int len
)
1128 struct rtattr
*start
= NLMSG_TAIL(n
);
1130 addattr_l(n
, maxlen
, type
, data
, len
);
1131 addattr_nest(n
, maxlen
, type
);
1135 int addattr_nest_compat_end(struct nlmsghdr
*n
, struct rtattr
*start
)
1137 struct rtattr
*nest
= (void *)start
+ NLMSG_ALIGN(start
->rta_len
);
1139 start
->rta_len
= (void *)NLMSG_TAIL(n
) - (void *)start
;
1140 addattr_nest_end(n
, nest
);
1141 return n
->nlmsg_len
;
1144 int rta_addattr32(struct rtattr
*rta
, int maxlen
, int type
, __u32 data
)
1146 int len
= RTA_LENGTH(4);
1147 struct rtattr
*subrta
;
1149 if (RTA_ALIGN(rta
->rta_len
) + len
> maxlen
) {
1151 "rta_addattr32: Error! max allowed bound %d exceeded\n",
1155 subrta
= (struct rtattr
*)(((char *)rta
) + RTA_ALIGN(rta
->rta_len
));
1156 subrta
->rta_type
= type
;
1157 subrta
->rta_len
= len
;
1158 memcpy(RTA_DATA(subrta
), &data
, 4);
1159 rta
->rta_len
= NLMSG_ALIGN(rta
->rta_len
) + len
;
1163 int rta_addattr_l(struct rtattr
*rta
, int maxlen
, int type
,
1164 const void *data
, int alen
)
1166 struct rtattr
*subrta
;
1167 int len
= RTA_LENGTH(alen
);
1169 if (RTA_ALIGN(rta
->rta_len
) + RTA_ALIGN(len
) > maxlen
) {
1171 "rta_addattr_l: Error! max allowed bound %d exceeded\n",
1175 subrta
= (struct rtattr
*)(((char *)rta
) + RTA_ALIGN(rta
->rta_len
));
1176 subrta
->rta_type
= type
;
1177 subrta
->rta_len
= len
;
1179 memcpy(RTA_DATA(subrta
), data
, alen
);
1180 rta
->rta_len
= NLMSG_ALIGN(rta
->rta_len
) + RTA_ALIGN(len
);
1184 int rta_addattr8(struct rtattr
*rta
, int maxlen
, int type
, __u8 data
)
1186 return rta_addattr_l(rta
, maxlen
, type
, &data
, sizeof(__u8
));
1189 int rta_addattr16(struct rtattr
*rta
, int maxlen
, int type
, __u16 data
)
1191 return rta_addattr_l(rta
, maxlen
, type
, &data
, sizeof(__u16
));
1194 int rta_addattr64(struct rtattr
*rta
, int maxlen
, int type
, __u64 data
)
1196 return rta_addattr_l(rta
, maxlen
, type
, &data
, sizeof(__u64
));
1199 struct rtattr
*rta_nest(struct rtattr
*rta
, int maxlen
, int type
)
1201 struct rtattr
*nest
= RTA_TAIL(rta
);
1203 rta_addattr_l(rta
, maxlen
, type
, NULL
, 0);
1208 int rta_nest_end(struct rtattr
*rta
, struct rtattr
*nest
)
1210 nest
->rta_len
= (void *)RTA_TAIL(rta
) - (void *)nest
;
1212 return rta
->rta_len
;
1215 int parse_rtattr(struct rtattr
*tb
[], int max
, struct rtattr
*rta
, int len
)
1217 return parse_rtattr_flags(tb
, max
, rta
, len
, 0);
1220 int parse_rtattr_flags(struct rtattr
*tb
[], int max
, struct rtattr
*rta
,
1221 int len
, unsigned short flags
)
1223 unsigned short type
;
1225 memset(tb
, 0, sizeof(struct rtattr
*) * (max
+ 1));
1226 while (RTA_OK(rta
, len
)) {
1227 type
= rta
->rta_type
& ~flags
;
1228 if ((type
<= max
) && (!tb
[type
]))
1230 rta
= RTA_NEXT(rta
, len
);
1233 fprintf(stderr
, "!!!Deficit %d, rta_len=%d\n",
1238 struct rtattr
*parse_rtattr_one(int type
, struct rtattr
*rta
, int len
)
1240 while (RTA_OK(rta
, len
)) {
1241 if (rta
->rta_type
== type
)
1243 rta
= RTA_NEXT(rta
, len
);
1247 fprintf(stderr
, "!!!Deficit %d, rta_len=%d\n",
1252 int __parse_rtattr_nested_compat(struct rtattr
*tb
[], int max
,
1256 if (RTA_PAYLOAD(rta
) < len
)
1258 if (RTA_PAYLOAD(rta
) >= RTA_ALIGN(len
) + sizeof(struct rtattr
)) {
1259 rta
= RTA_DATA(rta
) + RTA_ALIGN(len
);
1260 return parse_rtattr_nested(tb
, max
, rta
);
1262 memset(tb
, 0, sizeof(struct rtattr
*) * (max
+ 1));