diff options
| -rw-r--r-- | doc/ipv6.texi | 9 | ||||
| -rw-r--r-- | zebra/rtadv.c | 54 |
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 |