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-rw-r--r--doc/ipv6.texi9
-rw-r--r--zebra/rtadv.c54
2 files changed, 63 insertions, 0 deletions
diff --git a/doc/ipv6.texi b/doc/ipv6.texi
index a78a92fe..ff07dfb3 100644
--- a/doc/ipv6.texi
+++ b/doc/ipv6.texi
@@ -157,6 +157,15 @@ Set default router preference in IPv6 router advertisements per RFC4191.
Default: medium
@end deffn
+@deffn {Interface Command} {ipv6 nd mtu <1-65535>} {}
+@deffnx {Interface Command} {no ipv6 nd mtu [<1-65535>]} {}
+Include an MTU (type 5) option in each RA packet to assist the attached hosts
+in proper interface configuration. The announced value is not verified to be
+consistent with router interface MTU.
+
+Default: don't advertise any MTU option
+@end deffn
+
@example
@group
interface eth0
diff --git a/zebra/rtadv.c b/zebra/rtadv.c
index 3e8750aa..e0941357 100644
--- a/zebra/rtadv.c
+++ b/zebra/rtadv.c
@@ -319,6 +319,17 @@ rtadv_send_packet (int sock, struct interface *ifp)
}
#endif /* HAVE_STRUCT_SOCKADDR_DL */
+ /* MTU */
+ if (zif->rtadv.AdvLinkMTU)
+ {
+ struct nd_opt_mtu * opt = (struct nd_opt_mtu *) (buf + len);
+ opt->nd_opt_mtu_type = ND_OPT_MTU;
+ opt->nd_opt_mtu_len = 1;
+ opt->nd_opt_mtu_reserved = 0;
+ opt->nd_opt_mtu_mtu = htonl (zif->rtadv.AdvLinkMTU);
+ len += sizeof (struct nd_opt_mtu);
+ }
+
msg.msg_name = (void *) &addr;
msg.msg_namelen = sizeof (struct sockaddr_in6);
msg.msg_iov = &iov;
@@ -1430,6 +1441,43 @@ DEFUN (no_ipv6_nd_router_preference,
return CMD_SUCCESS;
}
+DEFUN (ipv6_nd_mtu,
+ ipv6_nd_mtu_cmd,
+ "ipv6 nd mtu <1-65535>",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Advertised MTU\n"
+ "MTU in bytes\n")
+{
+ struct interface *ifp = (struct interface *) vty->index;
+ struct zebra_if *zif = ifp->info;
+ VTY_GET_INTEGER_RANGE ("MTU", zif->rtadv.AdvLinkMTU, argv[0], 1, 65535);
+ return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_nd_mtu,
+ no_ipv6_nd_mtu_cmd,
+ "no ipv6 nd mtu",
+ NO_STR
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Advertised MTU\n")
+{
+ struct interface *ifp = (struct interface *) vty->index;
+ struct zebra_if *zif = ifp->info;
+ zif->rtadv.AdvLinkMTU = 0;
+ return CMD_SUCCESS;
+}
+
+ALIAS (no_ipv6_nd_mtu,
+ no_ipv6_nd_mtu_val_cmd,
+ "no ipv6 nd mtu <1-65535>",
+ NO_STR
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Advertised MTU\n"
+ "MTU in bytes\n")
+
/* Write configuration about router advertisement. */
void
rtadv_config_write (struct vty *vty, struct interface *ifp)
@@ -1482,6 +1530,9 @@ rtadv_config_write (struct vty *vty, struct interface *ifp)
rtadv_pref_strs[zif->rtadv.DefaultPreference],
VTY_NEWLINE);
+ if (zif->rtadv.AdvLinkMTU)
+ vty_out (vty, " ipv6 nd mtu %d%s", zif->rtadv.AdvLinkMTU, VTY_NEWLINE);
+
for (ALL_LIST_ELEMENTS_RO (zif->rtadv.AdvPrefixList, node, rprefix))
{
vty_out (vty, " ipv6 nd prefix %s/%d",
@@ -1605,6 +1656,9 @@ rtadv_init (void)
install_element (INTERFACE_NODE, &no_ipv6_nd_prefix_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_router_preference_cmd);
install_element (INTERFACE_NODE, &no_ipv6_nd_router_preference_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_mtu_cmd);
+ install_element (INTERFACE_NODE, &no_ipv6_nd_mtu_cmd);
+ install_element (INTERFACE_NODE, &no_ipv6_nd_mtu_val_cmd);
}
static int