@@ -51,7 +51,8 @@ static void usage(void)
fprintf(stderr,
"Usage: ip neigh { add | del | change | replace }\n"
" { ADDR [ lladdr LLADDR ] [ nud STATE ] proxy ADDR }\n"
- " [ dev DEV ] [ router ] [ use ] [ extern_learn ] [ protocol PROTO ]\n"
+ " [ dev DEV ] [ router ] [ use ] [ managed ] [ extern_learn ]\n"
+ " [ protocol PROTO ]\n"
"\n"
" ip neigh { show | flush } [ proxy ] [ to PREFIX ] [ dev DEV ] [ nud STATE ]\n"
" [ vrf NAME ]\n"
@@ -115,6 +116,7 @@ static int ipneigh_modify(int cmd, int flags, int argc, char **argv)
.ndm.ndm_family = preferred_family,
.ndm.ndm_state = NUD_PERMANENT,
};
+ __u32 ext_flags = 0;
char *dev = NULL;
int dst_ok = 0;
int dev_ok = 0;
@@ -150,6 +152,9 @@ static int ipneigh_modify(int cmd, int flags, int argc, char **argv)
req.ndm.ndm_flags |= NTF_ROUTER;
} else if (strcmp(*argv, "use") == 0) {
req.ndm.ndm_flags |= NTF_USE;
+ } else if (strcmp(*argv, "managed") == 0) {
+ ext_flags |= NTF_EXT_MANAGED;
+ req.ndm.ndm_state = NUD_NONE;
} else if (matches(*argv, "extern_learn") == 0) {
req.ndm.ndm_flags |= NTF_EXT_LEARNED;
} else if (strcmp(*argv, "dev") == 0) {
@@ -185,7 +190,10 @@ static int ipneigh_modify(int cmd, int flags, int argc, char **argv)
req.ndm.ndm_family = dst.family;
if (addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen) < 0)
return -1;
-
+ if (ext_flags &&
+ addattr_l(&req.n, sizeof(req), NDA_FLAGS_EXT, &ext_flags,
+ sizeof(ext_flags)) < 0)
+ return -1;
if (lla && strcmp(lla, "null")) {
char llabuf[20];
int l;
@@ -305,6 +313,7 @@ int print_neigh(struct nlmsghdr *n, void *arg)
int len = n->nlmsg_len;
struct rtattr *tb[NDA_MAX+1];
static int logit = 1;
+ __u32 ext_flags = 0;
__u8 protocol = 0;
if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH &&
@@ -348,6 +357,8 @@ int print_neigh(struct nlmsghdr *n, void *arg)
if (tb[NDA_PROTOCOL])
protocol = rta_getattr_u8(tb[NDA_PROTOCOL]);
+ if (tb[NDA_FLAGS_EXT])
+ ext_flags = rta_getattr_u32(tb[NDA_FLAGS_EXT]);
if (filter.protocol && filter.protocol != protocol)
return 0;
@@ -430,13 +441,12 @@ int print_neigh(struct nlmsghdr *n, void *arg)
if (r->ndm_flags & NTF_ROUTER)
print_null(PRINT_ANY, "router", "%s ", "router");
-
if (r->ndm_flags & NTF_PROXY)
print_null(PRINT_ANY, "proxy", "%s ", "proxy");
-
+ if (ext_flags & NTF_EXT_MANAGED)
+ print_null(PRINT_ANY, "managed", "%s ", "managed");
if (r->ndm_flags & NTF_EXT_LEARNED)
print_null(PRINT_ANY, "extern_learn", "%s ", "extern_learn");
-
if (r->ndm_flags & NTF_OFFLOADED)
print_null(PRINT_ANY, "offload", "%s ", "offload");
@@ -26,6 +26,7 @@ ip-neighbour \- neighbour/arp tables management.
.IR DEV " ] [ "
.BR router " ] [ "
.BR use " ] [ "
+.BR managed " ] [ "
.BR extern_learn " ]"
.ti -8
@@ -99,6 +100,14 @@ the kernel that a controller is using this dynamic entry. If the entry
does not exist, the kernel will resolve it. If it exists, an attempt
to refresh the neighbor entry will be triggered.
+.TP
+.BI managed
+this neigh entry is "managed". This option can be used to indicate to
+the kernel that a controller is using this dynamic entry. In contrast
+to "use", if the entry does not exist, the kernel will resolve it and
+periodically attempt to auto-refresh the neighbor entry such that it
+remains in resolved state when possible.
+
.TP
.BI extern_learn
this neigh entry was learned externally. This option can be used to
Currently, ip neigh does not support the NTF_EXT_MANAGED flag. Add cmdline support. Usage example: # ./ip/ip n replace 192.168.178.30 dev enp5s0 managed extern_learn # ./ip/ip n 192.168.178.30 dev enp5s0 lladdr f4:8c:50:5e:71:9a managed extern_learn REACHABLE [...] Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> --- ip/ipneigh.c | 20 +++++++++++++++----- man/man8/ip-neighbour.8 | 9 +++++++++ 2 files changed, 24 insertions(+), 5 deletions(-)