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ipneigh: neigh get support

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This patch adds support to lookup a neigh entry
using recently added support in the kernel using RTM_GETNEIGH

example:
$ip neigh get 10.0.2.4 dev test-dummy0
10.0.2.4 dev test-dummy0 lladdr de:ad:be:ef:13:37 PERMANENT

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Tested-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
Roopa Prabhu 2019-09-30 21:52:23 -07:00 committed by David Ahern
parent 4ed5ad7bd3
commit 6284236237
2 changed files with 108 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
ip/ipneigh.c
View File

@ -55,6 +55,7 @@ static void usage(void)
"\n"
" ip neigh { show | flush } [ proxy ] [ to PREFIX ] [ dev DEV ] [ nud STATE ]\n"
" [ vrf NAME ]\n"
" ip neigh get { ADDR | proxy ADDR } dev DEV\n"
"\n"
"STATE := { permanent | noarp | stale | reachable | none |\n"
" incomplete | delay | probe | failed }\n");
@ -599,6 +600,82 @@ static int do_show_or_flush(int argc, char **argv, int flush)
return 0;
}
static int ipneigh_get(int argc, char **argv)
{
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[1024];
} req = {
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
.n.nlmsg_flags = NLM_F_REQUEST,
.n.nlmsg_type = RTM_GETNEIGH,
.ndm.ndm_family = preferred_family,
};
struct nlmsghdr *answer;
char *d = NULL;
int dst_ok = 0;
int dev_ok = 0;
inet_prefix dst;
while (argc > 0) {
if (strcmp(*argv, "dev") == 0) {
NEXT_ARG();
d = *argv;
dev_ok = 1;
} else if (matches(*argv, "proxy") == 0) {
NEXT_ARG();
if (matches(*argv, "help") == 0)
usage();
if (dst_ok)
duparg("address", *argv);
get_addr(&dst, *argv, preferred_family);
dst_ok = 1;
dev_ok = 1;
req.ndm.ndm_flags |= NTF_PROXY;
} else {
if (strcmp(*argv, "to") == 0)
NEXT_ARG();
if (matches(*argv, "help") == 0)
usage();
if (dst_ok)
duparg2("to", *argv);
get_addr(&dst, *argv, preferred_family);
dst_ok = 1;
}
argc--; argv++;
}
if (!dev_ok || !dst_ok || dst.family == AF_UNSPEC) {
fprintf(stderr, "Device and address are required arguments.\n");
return -1;
}
req.ndm.ndm_family = dst.family;
if (addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen) < 0)
return -1;
if (d) {
req.ndm.ndm_ifindex = ll_name_to_index(d);
if (!req.ndm.ndm_ifindex) {
fprintf(stderr, "Cannot find device \"%s\"\n", d);
return -1;
}
}
if (rtnl_talk(&rth, &req.n, &answer) < 0)
return -2;
ipneigh_reset_filter(0);
if (print_neigh(answer, stdout) < 0) {
fprintf(stderr, "An error :-)\n");
return -1;
}
return 0;
}
int do_ipneigh(int argc, char **argv)
{
if (argc > 0) {
@ -611,10 +688,8 @@ int do_ipneigh(int argc, char **argv)
return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return ipneigh_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
if (matches(*argv, "get") == 0) {
fprintf(stderr, "Sorry, \"neigh get\" is not implemented :-(\n");
return -1;
}
if (matches(*argv, "get") == 0)
return ipneigh_get(argc-1, argv+1);
if (matches(*argv, "show") == 0 ||
matches(*argv, "lst") == 0 ||
matches(*argv, "list") == 0)

29
man/man8/ip-neighbour.8
View File

@ -37,6 +37,12 @@ ip-neighbour \- neighbour/arp tables management.
.B vrf
.IR NAME " ] "
.ti -8
.B ip neigh get
.IR ADDR
.B dev
.IR DEV
.ti -8
.IR STATE " := {"
.BR permanent " | " noarp " | " stale " | " reachable " | " none " |"
@ -231,6 +237,23 @@ twice,
also dumps all the deleted neighbours.
.RE
.TP
ip neigh get
lookup a neighbour entry to a destination given a device
.RS
.TP
.BI proxy
indicates whether we should lookup a proxy neigbour entry
.TP
.BI to " ADDRESS " (default)
the prefix selecting the neighbour to query.
.TP
.BI dev " NAME"
get neighbour entry attached to this device.
.SH EXAMPLES
.PP
ip neighbour
@ -242,6 +265,12 @@ ip neigh flush dev eth0
.RS
Removes entries in the neighbour table on device eth0.
.RE
.PP
ip neigh get 10.0.1.10 dev eth0
.RS
Performs a neighbour lookup in the kernel and returns
a neighbour entry.
.RE
.SH SEE ALSO
.br