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git.proxmox.com Git - mirror_iproute2.git/blob - ip/ipneigh.c
2 * ipneigh.c "ip neigh".
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>
14 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <netinet/ip.h>
31 #include "ip_common.h"
33 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
46 struct rtnl_handle
*rth
;
49 static void usage(void) __attribute__((noreturn
));
51 static void usage(void)
53 fprintf(stderr
, "Usage: ip neigh { add | del | change | replace } { ADDR [ lladdr LLADDR ]\n"
54 " [ nud { permanent | noarp | stale | reachable } ]\n"
55 " | proxy ADDR } [ dev DEV ]\n");
56 fprintf(stderr
, " ip neigh {show|flush} [ to PREFIX ] [ dev DEV ] [ nud STATE ]\n");
60 int nud_state_a2n(unsigned *state
, char *arg
)
62 if (matches(arg
, "permanent") == 0)
63 *state
= NUD_PERMANENT
;
64 else if (matches(arg
, "reachable") == 0)
65 *state
= NUD_REACHABLE
;
66 else if (strcmp(arg
, "noarp") == 0)
68 else if (strcmp(arg
, "none") == 0)
70 else if (strcmp(arg
, "stale") == 0)
72 else if (strcmp(arg
, "incomplete") == 0)
73 *state
= NUD_INCOMPLETE
;
74 else if (strcmp(arg
, "delay") == 0)
76 else if (strcmp(arg
, "probe") == 0)
78 else if (matches(arg
, "failed") == 0)
81 if (get_unsigned(state
, arg
, 0))
83 if (*state
>=0x100 || (*state
&((*state
)-1)))
89 static int flush_update(void)
91 if (rtnl_send(filter
.rth
, filter
.flushb
, filter
.flushp
) < 0) {
92 perror("Failed to send flush request\n");
100 static int ipneigh_modify(int cmd
, int flags
, int argc
, char **argv
)
102 struct rtnl_handle rth
;
114 memset(&req
, 0, sizeof(req
));
116 req
.n
.nlmsg_len
= NLMSG_LENGTH(sizeof(struct ndmsg
));
117 req
.n
.nlmsg_flags
= NLM_F_REQUEST
|flags
;
118 req
.n
.nlmsg_type
= cmd
;
119 req
.ndm
.ndm_family
= preferred_family
;
120 req
.ndm
.ndm_state
= NUD_PERMANENT
;
123 if (matches(*argv
, "lladdr") == 0) {
126 duparg("lladdr", *argv
);
129 } else if (strcmp(*argv
, "nud") == 0) {
132 if (nud_state_a2n(&state
, *argv
))
133 invarg("nud state is bad", *argv
);
134 req
.ndm
.ndm_state
= state
;
135 } else if (matches(*argv
, "proxy") == 0) {
137 if (matches(*argv
, "help") == 0)
140 duparg("address", *argv
);
141 get_addr(&dst
, *argv
, preferred_family
);
143 req
.ndm
.ndm_flags
|= NTF_PROXY
;
144 } else if (strcmp(*argv
, "dev") == 0) {
148 if (strcmp(*argv
, "to") == 0) {
151 if (matches(*argv
, "help") == 0) {
155 duparg2("to", *argv
);
156 get_addr(&dst
, *argv
, preferred_family
);
161 if (d
== NULL
|| !dst_ok
|| dst
.family
== AF_UNSPEC
) {
162 fprintf(stderr
, "Device and destination are required arguments.\n");
165 req
.ndm
.ndm_family
= dst
.family
;
166 addattr_l(&req
.n
, sizeof(req
), NDA_DST
, &dst
.data
, dst
.bytelen
);
168 if (lla
&& strcmp(lla
, "null")) {
172 l
= ll_addr_a2n(llabuf
, sizeof(llabuf
), lla
);
173 addattr_l(&req
.n
, sizeof(req
), NDA_LLADDR
, llabuf
, l
);
176 if (rtnl_open(&rth
, 0) < 0)
181 if ((req
.ndm
.ndm_ifindex
= ll_name_to_index(d
)) == 0) {
182 fprintf(stderr
, "Cannot find device \"%s\"\n", d
);
186 if (rtnl_talk(&rth
, &req
.n
, 0, 0, NULL
, NULL
, NULL
) < 0)
193 int print_neigh(const struct sockaddr_nl
*who
, struct nlmsghdr
*n
, void *arg
)
195 FILE *fp
= (FILE*)arg
;
196 struct ndmsg
*r
= NLMSG_DATA(n
);
197 int len
= n
->nlmsg_len
;
198 struct rtattr
* tb
[NDA_MAX
+1];
201 if (n
->nlmsg_type
!= RTM_NEWNEIGH
&& n
->nlmsg_type
!= RTM_DELNEIGH
) {
202 fprintf(stderr
, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
203 n
->nlmsg_len
, n
->nlmsg_type
, n
->nlmsg_flags
);
207 len
-= NLMSG_LENGTH(sizeof(*r
));
209 fprintf(stderr
, "BUG: wrong nlmsg len %d\n", len
);
213 if (filter
.flushb
&& n
->nlmsg_type
!= RTM_NEWNEIGH
)
216 if (filter
.family
&& filter
.family
!= r
->ndm_family
)
218 if (filter
.index
&& filter
.index
!= r
->ndm_ifindex
)
220 if (!(filter
.state
&r
->ndm_state
) &&
221 (r
->ndm_state
|| !(filter
.state
&0x100)) &&
222 (r
->ndm_family
!= AF_DECnet
))
225 parse_rtattr(tb
, NDA_MAX
, NDA_RTA(r
), n
->nlmsg_len
- NLMSG_LENGTH(sizeof(*r
)));
228 if (filter
.pfx
.family
) {
230 memset(&dst
, 0, sizeof(dst
));
231 dst
.family
= r
->ndm_family
;
232 memcpy(&dst
.data
, RTA_DATA(tb
[NDA_DST
]), RTA_PAYLOAD(tb
[NDA_DST
]));
233 if (inet_addr_match(&dst
, &filter
.pfx
, filter
.pfx
.bitlen
))
237 if (filter
.unused_only
&& tb
[NDA_CACHEINFO
]) {
238 struct nda_cacheinfo
*ci
= RTA_DATA(tb
[NDA_CACHEINFO
]);
245 if (NLMSG_ALIGN(filter
.flushp
) + n
->nlmsg_len
> filter
.flushe
) {
249 fn
= (struct nlmsghdr
*)(filter
.flushb
+ NLMSG_ALIGN(filter
.flushp
));
250 memcpy(fn
, n
, n
->nlmsg_len
);
251 fn
->nlmsg_type
= RTM_DELNEIGH
;
252 fn
->nlmsg_flags
= NLM_F_REQUEST
;
253 fn
->nlmsg_seq
= ++filter
.rth
->seq
;
254 filter
.flushp
= (((char*)fn
) + n
->nlmsg_len
) - filter
.flushb
;
262 format_host(r
->ndm_family
,
263 RTA_PAYLOAD(tb
[NDA_DST
]),
264 RTA_DATA(tb
[NDA_DST
]),
265 abuf
, sizeof(abuf
)));
267 if (!filter
.index
&& r
->ndm_ifindex
)
268 fprintf(fp
, "dev %s ", ll_index_to_name(r
->ndm_ifindex
));
269 if (tb
[NDA_LLADDR
]) {
271 fprintf(fp
, "lladdr %s", ll_addr_n2a(RTA_DATA(tb
[NDA_LLADDR
]),
272 RTA_PAYLOAD(tb
[NDA_LLADDR
]),
273 ll_index_to_type(r
->ndm_ifindex
),
276 if (r
->ndm_flags
& NTF_ROUTER
) {
277 fprintf(fp
, " router");
279 if (tb
[NDA_CACHEINFO
] && show_stats
) {
281 struct nda_cacheinfo
*ci
= RTA_DATA(tb
[NDA_CACHEINFO
]);
285 printf(" ref %d", ci
->ndm_refcnt
);
286 fprintf(fp
, " used %d/%d/%d", ci
->ndm_used
/hz
,
287 ci
->ndm_confirmed
/hz
, ci
->ndm_updated
/hz
);
291 if (tb
[NDA_PROBES
] && show_stats
) {
292 __u32 p
= *(__u32
*) RTA_DATA(tb
[NDA_PROBES
]);
293 fprintf(fp
, " probes %u", p
);
298 int nud
= r
->ndm_state
;
301 #define PRINT_FLAG(f) if (nud & NUD_##f) { \
302 nud &= ~NUD_##f; fprintf(fp, #f "%s", nud ? "," : ""); }
303 PRINT_FLAG(INCOMPLETE
);
304 PRINT_FLAG(REACHABLE
);
310 PRINT_FLAG(PERMANENT
);
319 void ipneigh_reset_filter()
321 memset(&filter
, 0, sizeof(filter
));
325 int do_show_or_flush(int argc
, char **argv
, int flush
)
327 char *filter_dev
= NULL
;
328 struct rtnl_handle rth
;
331 ipneigh_reset_filter();
334 filter
.family
= preferred_family
;
338 fprintf(stderr
, "Flush requires arguments.\n");
341 filter
.state
= ~(NUD_PERMANENT
|NUD_NOARP
);
343 filter
.state
= 0xFF & ~NUD_NOARP
;
346 if (strcmp(*argv
, "dev") == 0) {
349 duparg("dev", *argv
);
351 } else if (strcmp(*argv
, "unused") == 0) {
352 filter
.unused_only
= 1;
353 } else if (strcmp(*argv
, "nud") == 0) {
360 if (nud_state_a2n(&state
, *argv
)) {
361 if (strcmp(*argv
, "all") != 0)
362 invarg("nud state is bad", *argv
);
369 filter
.state
|= state
;
371 if (strcmp(*argv
, "to") == 0) {
374 if (matches(*argv
, "help") == 0)
376 get_prefix(&filter
.pfx
, *argv
, filter
.family
);
377 if (filter
.family
== AF_UNSPEC
)
378 filter
.family
= filter
.pfx
.family
;
383 if (rtnl_open(&rth
, 0) < 0)
389 if ((filter
.index
= ll_name_to_index(filter_dev
)) == 0) {
390 fprintf(stderr
, "Cannot find device \"%s\"\n", filter_dev
);
397 char flushb
[4096-512];
399 filter
.flushb
= flushb
;
401 filter
.flushe
= sizeof(flushb
);
403 filter
.state
&= ~NUD_FAILED
;
406 if (rtnl_wilddump_request(&rth
, filter
.family
, RTM_GETNEIGH
) < 0) {
407 perror("Cannot send dump request");
411 if (rtnl_dump_filter(&rth
, print_neigh
, stdout
, NULL
, NULL
) < 0) {
412 fprintf(stderr
, "Flush terminated\n");
415 if (filter
.flushed
== 0) {
417 fprintf(stderr
, "Nothing to flush.\n");
418 } else if (show_stats
)
419 printf("*** Flush is complete after %d round%s ***\n", round
, round
>1?"s":"");
424 if (flush_update() < 0)
427 printf("\n*** Round %d, deleting %d entries ***\n", round
, filter
.flushed
);
433 if (rtnl_wilddump_request(&rth
, filter
.family
, RTM_GETNEIGH
) < 0) {
434 perror("Cannot send dump request");
438 if (rtnl_dump_filter(&rth
, print_neigh
, stdout
, NULL
, NULL
) < 0) {
439 fprintf(stderr
, "Dump terminated\n");
446 int do_ipneigh(int argc
, char **argv
)
449 if (matches(*argv
, "add") == 0)
450 return ipneigh_modify(RTM_NEWNEIGH
, NLM_F_CREATE
|NLM_F_EXCL
, argc
-1, argv
+1);
451 if (matches(*argv
, "change") == 0 ||
452 strcmp(*argv
, "chg") == 0)
453 return ipneigh_modify(RTM_NEWNEIGH
, NLM_F_REPLACE
, argc
-1, argv
+1);
454 if (matches(*argv
, "replace") == 0)
455 return ipneigh_modify(RTM_NEWNEIGH
, NLM_F_CREATE
|NLM_F_REPLACE
, argc
-1, argv
+1);
456 if (matches(*argv
, "delete") == 0)
457 return ipneigh_modify(RTM_DELNEIGH
, 0, argc
-1, argv
+1);
458 if (matches(*argv
, "get") == 0) {
459 fprintf(stderr
, "Sorry, \"neigh get\" is not implemented :-(\n");
462 if (matches(*argv
, "show") == 0 ||
463 matches(*argv
, "lst") == 0 ||
464 matches(*argv
, "list") == 0)
465 return do_show_or_flush(argc
-1, argv
+1, 0);
466 if (matches(*argv
, "flush") == 0)
467 return do_show_or_flush(argc
-1, argv
+1, 1);
468 if (matches(*argv
, "help") == 0)
471 return do_show_or_flush(0, NULL
, 0);
473 fprintf(stderr
, "Command \"%s\" is unknown, try \"ip neigh help\".\n", *argv
);