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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)
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(&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
)
113 memset(&req
, 0, sizeof(req
));
115 req
.n
.nlmsg_len
= NLMSG_LENGTH(sizeof(struct ndmsg
));
116 req
.n
.nlmsg_flags
= NLM_F_REQUEST
|flags
;
117 req
.n
.nlmsg_type
= cmd
;
118 req
.ndm
.ndm_family
= preferred_family
;
119 req
.ndm
.ndm_state
= NUD_PERMANENT
;
122 if (matches(*argv
, "lladdr") == 0) {
125 duparg("lladdr", *argv
);
128 } else if (strcmp(*argv
, "nud") == 0) {
131 if (nud_state_a2n(&state
, *argv
))
132 invarg("nud state is bad", *argv
);
133 req
.ndm
.ndm_state
= state
;
134 } else if (matches(*argv
, "proxy") == 0) {
136 if (matches(*argv
, "help") == 0)
139 duparg("address", *argv
);
140 get_addr(&dst
, *argv
, preferred_family
);
142 req
.ndm
.ndm_flags
|= NTF_PROXY
;
143 } else if (strcmp(*argv
, "dev") == 0) {
147 if (strcmp(*argv
, "to") == 0) {
150 if (matches(*argv
, "help") == 0) {
154 duparg2("to", *argv
);
155 get_addr(&dst
, *argv
, preferred_family
);
160 if (d
== NULL
|| !dst_ok
|| dst
.family
== AF_UNSPEC
) {
161 fprintf(stderr
, "Device and destination are required arguments.\n");
164 req
.ndm
.ndm_family
= dst
.family
;
165 addattr_l(&req
.n
, sizeof(req
), NDA_DST
, &dst
.data
, dst
.bytelen
);
167 if (lla
&& strcmp(lla
, "null")) {
171 l
= ll_addr_a2n(llabuf
, sizeof(llabuf
), lla
);
172 addattr_l(&req
.n
, sizeof(req
), NDA_LLADDR
, llabuf
, l
);
177 if ((req
.ndm
.ndm_ifindex
= ll_name_to_index(d
)) == 0) {
178 fprintf(stderr
, "Cannot find device \"%s\"\n", d
);
182 if (rtnl_talk(&rth
, &req
.n
, 0, 0, NULL
, NULL
, NULL
) < 0)
189 int print_neigh(const struct sockaddr_nl
*who
, struct nlmsghdr
*n
, void *arg
)
191 FILE *fp
= (FILE*)arg
;
192 struct ndmsg
*r
= NLMSG_DATA(n
);
193 int len
= n
->nlmsg_len
;
194 struct rtattr
* tb
[NDA_MAX
+1];
197 if (n
->nlmsg_type
!= RTM_NEWNEIGH
&& n
->nlmsg_type
!= RTM_DELNEIGH
) {
198 fprintf(stderr
, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
199 n
->nlmsg_len
, n
->nlmsg_type
, n
->nlmsg_flags
);
203 len
-= NLMSG_LENGTH(sizeof(*r
));
205 fprintf(stderr
, "BUG: wrong nlmsg len %d\n", len
);
209 if (filter
.flushb
&& n
->nlmsg_type
!= RTM_NEWNEIGH
)
212 if (filter
.family
&& filter
.family
!= r
->ndm_family
)
214 if (filter
.index
&& filter
.index
!= r
->ndm_ifindex
)
216 if (!(filter
.state
&r
->ndm_state
) &&
217 (r
->ndm_state
|| !(filter
.state
&0x100)) &&
218 (r
->ndm_family
!= AF_DECnet
))
221 parse_rtattr(tb
, NDA_MAX
, NDA_RTA(r
), n
->nlmsg_len
- NLMSG_LENGTH(sizeof(*r
)));
224 if (filter
.pfx
.family
) {
226 memset(&dst
, 0, sizeof(dst
));
227 dst
.family
= r
->ndm_family
;
228 memcpy(&dst
.data
, RTA_DATA(tb
[NDA_DST
]), RTA_PAYLOAD(tb
[NDA_DST
]));
229 if (inet_addr_match(&dst
, &filter
.pfx
, filter
.pfx
.bitlen
))
233 if (filter
.unused_only
&& tb
[NDA_CACHEINFO
]) {
234 struct nda_cacheinfo
*ci
= RTA_DATA(tb
[NDA_CACHEINFO
]);
241 if (NLMSG_ALIGN(filter
.flushp
) + n
->nlmsg_len
> filter
.flushe
) {
245 fn
= (struct nlmsghdr
*)(filter
.flushb
+ NLMSG_ALIGN(filter
.flushp
));
246 memcpy(fn
, n
, n
->nlmsg_len
);
247 fn
->nlmsg_type
= RTM_DELNEIGH
;
248 fn
->nlmsg_flags
= NLM_F_REQUEST
;
249 fn
->nlmsg_seq
= ++rth
.seq
;
250 filter
.flushp
= (((char*)fn
) + n
->nlmsg_len
) - filter
.flushb
;
258 format_host(r
->ndm_family
,
259 RTA_PAYLOAD(tb
[NDA_DST
]),
260 RTA_DATA(tb
[NDA_DST
]),
261 abuf
, sizeof(abuf
)));
263 if (!filter
.index
&& r
->ndm_ifindex
)
264 fprintf(fp
, "dev %s ", ll_index_to_name(r
->ndm_ifindex
));
265 if (tb
[NDA_LLADDR
]) {
267 fprintf(fp
, "lladdr %s", ll_addr_n2a(RTA_DATA(tb
[NDA_LLADDR
]),
268 RTA_PAYLOAD(tb
[NDA_LLADDR
]),
269 ll_index_to_type(r
->ndm_ifindex
),
272 if (r
->ndm_flags
& NTF_ROUTER
) {
273 fprintf(fp
, " router");
275 if (tb
[NDA_CACHEINFO
] && show_stats
) {
277 struct nda_cacheinfo
*ci
= RTA_DATA(tb
[NDA_CACHEINFO
]);
281 printf(" ref %d", ci
->ndm_refcnt
);
282 fprintf(fp
, " used %d/%d/%d", ci
->ndm_used
/hz
,
283 ci
->ndm_confirmed
/hz
, ci
->ndm_updated
/hz
);
287 if (tb
[NDA_PROBES
] && show_stats
) {
288 __u32 p
= *(__u32
*) RTA_DATA(tb
[NDA_PROBES
]);
289 fprintf(fp
, " probes %u", p
);
294 int nud
= r
->ndm_state
;
297 #define PRINT_FLAG(f) if (nud & NUD_##f) { \
298 nud &= ~NUD_##f; fprintf(fp, #f "%s", nud ? "," : ""); }
299 PRINT_FLAG(INCOMPLETE
);
300 PRINT_FLAG(REACHABLE
);
306 PRINT_FLAG(PERMANENT
);
315 void ipneigh_reset_filter()
317 memset(&filter
, 0, sizeof(filter
));
321 int do_show_or_flush(int argc
, char **argv
, int flush
)
323 char *filter_dev
= NULL
;
326 ipneigh_reset_filter();
329 filter
.family
= preferred_family
;
333 fprintf(stderr
, "Flush requires arguments.\n");
336 filter
.state
= ~(NUD_PERMANENT
|NUD_NOARP
);
338 filter
.state
= 0xFF & ~NUD_NOARP
;
341 if (strcmp(*argv
, "dev") == 0) {
344 duparg("dev", *argv
);
346 } else if (strcmp(*argv
, "unused") == 0) {
347 filter
.unused_only
= 1;
348 } else if (strcmp(*argv
, "nud") == 0) {
355 if (nud_state_a2n(&state
, *argv
)) {
356 if (strcmp(*argv
, "all") != 0)
357 invarg("nud state is bad", *argv
);
364 filter
.state
|= state
;
366 if (strcmp(*argv
, "to") == 0) {
369 if (matches(*argv
, "help") == 0)
371 get_prefix(&filter
.pfx
, *argv
, filter
.family
);
372 if (filter
.family
== AF_UNSPEC
)
373 filter
.family
= filter
.pfx
.family
;
381 if ((filter
.index
= ll_name_to_index(filter_dev
)) == 0) {
382 fprintf(stderr
, "Cannot find device \"%s\"\n", filter_dev
);
389 char flushb
[4096-512];
391 filter
.flushb
= flushb
;
393 filter
.flushe
= sizeof(flushb
);
394 filter
.state
&= ~NUD_FAILED
;
396 while (round
< MAX_ROUNDS
) {
397 if (rtnl_wilddump_request(&rth
, filter
.family
, RTM_GETNEIGH
) < 0) {
398 perror("Cannot send dump request");
402 if (rtnl_dump_filter(&rth
, print_neigh
, stdout
, NULL
, NULL
) < 0) {
403 fprintf(stderr
, "Flush terminated\n");
406 if (filter
.flushed
== 0) {
408 fprintf(stderr
, "Nothing to flush.\n");
409 } else if (show_stats
)
410 printf("*** Flush is complete after %d round%s ***\n", round
, round
>1?"s":"");
415 if (flush_update() < 0)
418 printf("\n*** Round %d, deleting %d entries ***\n", round
, filter
.flushed
);
422 printf("*** Flush not complete bailing out after %d rounds\n",
427 if (rtnl_wilddump_request(&rth
, filter
.family
, RTM_GETNEIGH
) < 0) {
428 perror("Cannot send dump request");
432 if (rtnl_dump_filter(&rth
, print_neigh
, stdout
, NULL
, NULL
) < 0) {
433 fprintf(stderr
, "Dump terminated\n");
440 int do_ipneigh(int argc
, char **argv
)
443 if (matches(*argv
, "add") == 0)
444 return ipneigh_modify(RTM_NEWNEIGH
, NLM_F_CREATE
|NLM_F_EXCL
, argc
-1, argv
+1);
445 if (matches(*argv
, "change") == 0 ||
446 strcmp(*argv
, "chg") == 0)
447 return ipneigh_modify(RTM_NEWNEIGH
, NLM_F_REPLACE
, argc
-1, argv
+1);
448 if (matches(*argv
, "replace") == 0)
449 return ipneigh_modify(RTM_NEWNEIGH
, NLM_F_CREATE
|NLM_F_REPLACE
, argc
-1, argv
+1);
450 if (matches(*argv
, "delete") == 0)
451 return ipneigh_modify(RTM_DELNEIGH
, 0, argc
-1, argv
+1);
452 if (matches(*argv
, "get") == 0) {
453 fprintf(stderr
, "Sorry, \"neigh get\" is not implemented :-(\n");
456 if (matches(*argv
, "show") == 0 ||
457 matches(*argv
, "lst") == 0 ||
458 matches(*argv
, "list") == 0)
459 return do_show_or_flush(argc
-1, argv
+1, 0);
460 if (matches(*argv
, "flush") == 0)
461 return do_show_or_flush(argc
-1, argv
+1, 1);
462 if (matches(*argv
, "help") == 0)
465 return do_show_or_flush(0, NULL
, 0);
467 fprintf(stderr
, "Command \"%s\" is unknown, try \"ip neigh help\".\n", *argv
);