2005-03-25 Jean-Mickael Guerin <jean-mickael.guerin@6wind.com>
* interface.c, interface.h, rtadv.c, rtadv.h: extensions to Neighbor
discovery for Mobile IPv6.
diff --git a/zebra/rtadv.c b/zebra/rtadv.c
index 1238396..7259656 100644
--- a/zebra/rtadv.c
+++ b/zebra/rtadv.c
@@ -1,4 +1,5 @@
/* Router advertisement
+ * Copyright (C) 2005 6WIND <jean-mickael.guerin@6wind.com>
* Copyright (C) 1999 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
@@ -58,7 +59,8 @@
extern struct zebra_t zebrad;
-enum rtadv_event {RTADV_START, RTADV_STOP, RTADV_TIMER, RTADV_READ};
+enum rtadv_event {RTADV_START, RTADV_STOP, RTADV_TIMER,
+ RTADV_TIMER_MSEC, RTADV_READ};
void rtadv_event (enum rtadv_event, int);
@@ -71,6 +73,7 @@
int sock;
int adv_if_count;
+ int adv_msec_if_count;
struct thread *ra_read;
struct thread *ra_timer;
@@ -210,12 +213,37 @@
rtadv->nd_ra_flags_reserved |= ND_RA_FLAG_MANAGED;
if (zif->rtadv.AdvOtherConfigFlag)
rtadv->nd_ra_flags_reserved |= ND_RA_FLAG_OTHER;
+ if (zif->rtadv.AdvHomeAgentFlag)
+ rtadv->nd_ra_flags_reserved |= ND_RA_FLAG_HOME_AGENT;
rtadv->nd_ra_router_lifetime = htons (zif->rtadv.AdvDefaultLifetime);
rtadv->nd_ra_reachable = htonl (zif->rtadv.AdvReachableTime);
rtadv->nd_ra_retransmit = htonl (0);
len = sizeof (struct nd_router_advert);
+ if (zif->rtadv.AdvHomeAgentFlag)
+ {
+ struct nd_opt_homeagent_info *ndopt_hai =
+ (struct nd_opt_homeagent_info *)(buf + len);
+ ndopt_hai->nd_opt_hai_type = ND_OPT_HA_INFORMATION;
+ ndopt_hai->nd_opt_hai_len = 1;
+ ndopt_hai->nd_opt_hai_reserved = 0;
+ ndopt_hai->nd_opt_hai_preference = htons(zif->rtadv.HomeAgentPreference);
+ ndopt_hai->nd_opt_hai_lifetime = htons(zif->rtadv.HomeAgentLifetime);
+ len += sizeof(struct nd_opt_homeagent_info);
+ }
+
+ if (zif->rtadv.AdvIntervalOption)
+ {
+ struct nd_opt_adv_interval *ndopt_adv =
+ (struct nd_opt_adv_interval *)(buf + len);
+ ndopt_adv->nd_opt_ai_type = ND_OPT_ADV_INTERVAL;
+ ndopt_adv->nd_opt_ai_len = 1;
+ ndopt_adv->nd_opt_ai_reserved = 0;
+ ndopt_adv->nd_opt_ai_interval = htonl(zif->rtadv.MaxRtrAdvInterval);
+ len += sizeof(struct nd_opt_adv_interval);
+ }
+
/* Fill in prefix. */
for (node = listhead (zif->rtadv.AdvPrefixList); node; node = nextnode (node))
{
@@ -235,6 +263,8 @@
pinfo->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_ONLINK;
if (rprefix->AdvAutonomousFlag)
pinfo->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_AUTO;
+ if (rprefix->AdvRouterAddressFlag)
+ pinfo->nd_opt_pi_flags_reserved |= ND_OPT_PI_FLAG_RADDR;
pinfo->nd_opt_pi_valid_time = htonl (rprefix->AdvValidLifetime);
pinfo->nd_opt_pi_preferred_time = htonl (rprefix->AdvPreferredLifetime);
@@ -311,9 +341,19 @@
struct listnode *node;
struct interface *ifp;
struct zebra_if *zif;
+ int period;
rtadv->ra_timer = NULL;
- rtadv_event (RTADV_TIMER, 1);
+ if (rtadv->adv_msec_if_count == 0)
+ {
+ period = 1000; /* 1 s */
+ rtadv_event (RTADV_TIMER, 1 /* 1 s */);
+ }
+ else
+ {
+ period = 10; /* 10 ms */
+ rtadv_event (RTADV_TIMER_MSEC, 10 /* 10 ms */);
+ }
for (node = listhead (iflist); node; nextnode (node))
{
@@ -325,11 +365,14 @@
zif = ifp->info;
if (zif->rtadv.AdvSendAdvertisements)
- if (--zif->rtadv.AdvIntervalTimer <= 0)
- {
- zif->rtadv.AdvIntervalTimer = zif->rtadv.MaxRtrAdvInterval;
- rtadv_send_packet (rtadv->sock, ifp);
- }
+ {
+ zif->rtadv.AdvIntervalTimer -= period;
+ if (zif->rtadv.AdvIntervalTimer <= 0)
+ {
+ zif->rtadv.AdvIntervalTimer = zif->rtadv.MaxRtrAdvInterval;
+ rtadv_send_packet (rtadv->sock, ifp);
+ }
+ }
}
return 0;
}
@@ -547,6 +590,7 @@
rprefix->AdvPreferredLifetime = rp->AdvPreferredLifetime;
rprefix->AdvOnLinkFlag = rp->AdvOnLinkFlag;
rprefix->AdvAutonomousFlag = rp->AdvAutonomousFlag;
+ rprefix->AdvRouterAddressFlag = rp->AdvRouterAddressFlag;
}
int
@@ -634,6 +678,42 @@
return CMD_SUCCESS;
}
+DEFUN (ipv6_nd_ra_interval_msec,
+ ipv6_nd_ra_interval_msec_cmd,
+ "ipv6 nd ra-interval msec MILLISECONDS",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Router Advertisement interval\n"
+ "Router Advertisement interval in milliseconds\n")
+{
+ int interval;
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ interval = atoi (argv[0]);
+
+ if (interval <= 0)
+ {
+ vty_out (vty, "Invalid Router Advertisement Interval%s", VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ if (zif->rtadv.MaxRtrAdvInterval % 1000)
+ rtadv->adv_msec_if_count--;
+
+ if (interval % 1000)
+ rtadv->adv_msec_if_count++;
+
+ zif->rtadv.MaxRtrAdvInterval = interval;
+ zif->rtadv.MinRtrAdvInterval = 0.33 * interval;
+ zif->rtadv.AdvIntervalTimer = 0;
+
+ return CMD_SUCCESS;
+}
+
DEFUN (ipv6_nd_ra_interval,
ipv6_nd_ra_interval_cmd,
"ipv6 nd ra-interval SECONDS",
@@ -651,12 +731,18 @@
interval = atoi (argv[0]);
- if (interval < 0)
+ if (interval <= 0)
{
vty_out (vty, "Invalid Router Advertisement Interval%s", VTY_NEWLINE);
return CMD_WARNING;
}
+ if (zif->rtadv.MaxRtrAdvInterval % 1000)
+ rtadv->adv_msec_if_count--;
+
+ /* convert to milliseconds */
+ interval = interval * 1000;
+
zif->rtadv.MaxRtrAdvInterval = interval;
zif->rtadv.MinRtrAdvInterval = 0.33 * interval;
zif->rtadv.AdvIntervalTimer = 0;
@@ -678,6 +764,9 @@
ifp = (struct interface *) vty->index;
zif = ifp->info;
+ if (zif->rtadv.MaxRtrAdvInterval % 1000)
+ rtadv->adv_msec_if_count--;
+
zif->rtadv.MaxRtrAdvInterval = RTADV_MAX_RTR_ADV_INTERVAL;
zif->rtadv.MinRtrAdvInterval = RTADV_MIN_RTR_ADV_INTERVAL;
zif->rtadv.AdvIntervalTimer = zif->rtadv.MaxRtrAdvInterval;
@@ -779,6 +868,100 @@
return CMD_SUCCESS;
}
+DEFUN (ipv6_nd_homeagent_preference,
+ ipv6_nd_homeagent_preference_cmd,
+ "ipv6 nd home-agent-preference PREFERENCE",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Home Agent preference\n"
+ "Home Agent preference value 0..65535\n")
+{
+ u_int32_t hapref;
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ hapref = (u_int32_t) atol (argv[0]);
+
+ if (hapref > 65535)
+ {
+ vty_out (vty, "Invalid Home Agent preference%s", VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ zif->rtadv.HomeAgentPreference = hapref;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_nd_homeagent_preference,
+ no_ipv6_nd_homeagent_preference_cmd,
+ "no ipv6 nd home-agent-preference",
+ NO_STR
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Home Agent preference\n")
+{
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ zif->rtadv.HomeAgentPreference = 0;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (ipv6_nd_homeagent_lifetime,
+ ipv6_nd_homeagent_lifetime_cmd,
+ "ipv6 nd home-agent-lifetime SECONDS",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Home Agent lifetime\n"
+ "Home Agent lifetime in seconds\n")
+{
+ u_int32_t ha_ltime;
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ ha_ltime = (u_int32_t) atol (argv[0]);
+
+ if (ha_ltime > RTADV_MAX_HALIFETIME)
+ {
+ vty_out (vty, "Invalid Home Agent Lifetime time%s", VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ zif->rtadv.HomeAgentLifetime = ha_ltime;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_nd_homeagent_lifetime,
+ no_ipv6_nd_homeagent_lifetime_cmd,
+ "no ipv6 nd home-agent-lifetime",
+ NO_STR
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Home Agent lifetime\n")
+{
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ zif->rtadv.HomeAgentLifetime = 0;
+
+ return CMD_SUCCESS;
+}
+
DEFUN (ipv6_nd_managed_config_flag,
ipv6_nd_managed_config_flag_cmd,
"ipv6 nd managed-config-flag",
@@ -816,6 +999,80 @@
return CMD_SUCCESS;
}
+DEFUN (ipv6_nd_homeagent_config_flag,
+ ipv6_nd_homeagent_config_flag_cmd,
+ "ipv6 nd home-agent-config-flag",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Home Agent configuration flag\n")
+{
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ zif->rtadv.AdvHomeAgentFlag = 1;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_nd_homeagent_config_flag,
+ no_ipv6_nd_homeagent_config_flag_cmd,
+ "no ipv6 nd home-agent-config-flag",
+ NO_STR
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Home Agent configuration flag\n")
+{
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ zif->rtadv.AdvHomeAgentFlag = 0;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (ipv6_nd_adv_interval_config_option,
+ ipv6_nd_adv_interval_config_option_cmd,
+ "ipv6 nd adv-interval-option",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Advertisement Interval Option\n")
+{
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ zif->rtadv.AdvIntervalOption = 1;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_nd_adv_interval_config_option,
+ no_ipv6_nd_adv_interval_config_option_cmd,
+ "no ipv6 nd adv-interval-option",
+ NO_STR
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Advertisement Interval Option\n")
+{
+ struct interface *ifp;
+ struct zebra_if *zif;
+
+ ifp = (struct interface *) vty->index;
+ zif = ifp->info;
+
+ zif->rtadv.AdvIntervalOption = 0;
+
+ return CMD_SUCCESS;
+}
+
DEFUN (ipv6_nd_other_config_flag,
ipv6_nd_other_config_flag_cmd,
"ipv6 nd other-config-flag",
@@ -856,7 +1113,7 @@
DEFUN (ipv6_nd_prefix,
ipv6_nd_prefix_cmd,
"ipv6 nd prefix X:X::X:X/M (<0-4294967295>|infinite) "
- "(<0-4294967295>|infinite) (off-link|) (no-autoconfig|)",
+ "(<0-4294967295>|infinite) (off-link|) (no-autoconfig|) (router-address|)",
"Interface IPv6 config commands\n"
"Neighbor discovery\n"
"Prefix information\n"
@@ -866,7 +1123,8 @@
"Preferred lifetime in seconds\n"
"Infinite preferred lifetime\n"
"Do not use prefix for onlink determination\n"
- "Do not use prefix for autoconfiguration\n")
+ "Do not use prefix for autoconfiguration\n"
+ "Set Router Address flag\n")
{
int i;
int ret;
@@ -886,6 +1144,7 @@
}
rp.AdvOnLinkFlag = 1;
rp.AdvAutonomousFlag = 1;
+ rp.AdvRouterAddressFlag = 0;
rp.AdvValidLifetime = RTADV_VALID_LIFETIME;
rp.AdvPreferredLifetime = RTADV_PREFERRED_LIFETIME;
@@ -920,6 +1179,8 @@
rp.AdvOnLinkFlag = 0;
if (strncmp (argv[i], "no", 2) == 0)
rp.AdvAutonomousFlag = 0;
+ if (strncmp (argv[i], "ro", 2) == 0)
+ rp.AdvRouterAddressFlag = 1;
}
}
}
@@ -930,6 +1191,21 @@
}
ALIAS (ipv6_nd_prefix,
+ ipv6_nd_prefix_val_nortaddr_cmd,
+ "ipv6 nd prefix X:X::X:X/M (<0-4294967295>|infinite) "
+ "(<0-4294967295>|infinite) (off-link|) (no-autoconfig|)",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Prefix information\n"
+ "IPv6 prefix\n"
+ "Valid lifetime in seconds\n"
+ "Infinite valid lifetime\n"
+ "Preferred lifetime in seconds\n"
+ "Infinite preferred lifetime\n"
+ "Do not use prefix for onlink determination\n"
+ "Do not use prefix for autoconfiguration\n")
+
+ALIAS (ipv6_nd_prefix,
ipv6_nd_prefix_val_rev_cmd,
"ipv6 nd prefix X:X::X:X/M (<0-4294967295>|infinite) "
"(<0-4294967295>|infinite) (no-autoconfig|) (off-link|)",
@@ -945,6 +1221,22 @@
"Do not use prefix for onlink determination\n")
ALIAS (ipv6_nd_prefix,
+ ipv6_nd_prefix_val_rev_rtaddr_cmd,
+ "ipv6 nd prefix X:X::X:X/M (<0-4294967295>|infinite) "
+ "(<0-4294967295>|infinite) (no-autoconfig|) (off-link|) (router-address|)",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Prefix information\n"
+ "IPv6 prefix\n"
+ "Valid lifetime in seconds\n"
+ "Infinite valid lifetime\n"
+ "Preferred lifetime in seconds\n"
+ "Infinite preferred lifetime\n"
+ "Do not use prefix for autoconfiguration\n"
+ "Do not use prefix for onlink determination\n"
+ "Set Router Address flag\n")
+
+ALIAS (ipv6_nd_prefix,
ipv6_nd_prefix_val_noauto_cmd,
"ipv6 nd prefix X:X::X:X/M (<0-4294967295>|infinite) "
"(<0-4294967295>|infinite) (no-autoconfig|)",
@@ -956,7 +1248,7 @@
"Infinite valid lifetime\n"
"Preferred lifetime in seconds\n"
"Infinite preferred lifetime\n"
- "Do not use prefix for autoconfigurationn")
+ "Do not use prefix for autoconfiguration")
ALIAS (ipv6_nd_prefix,
ipv6_nd_prefix_val_offlink_cmd,
@@ -973,6 +1265,20 @@
"Do not use prefix for onlink determination\n")
ALIAS (ipv6_nd_prefix,
+ ipv6_nd_prefix_val_rtaddr_cmd,
+ "ipv6 nd prefix X:X::X:X/M (<0-4294967295>|infinite) "
+ "(<0-4294967295>|infinite) (router-address|)",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Prefix information\n"
+ "IPv6 prefix\n"
+ "Valid lifetime in seconds\n"
+ "Infinite valid lifetime\n"
+ "Preferred lifetime in seconds\n"
+ "Infinite preferred lifetime\n"
+ "Set Router Address flag\n")
+
+ALIAS (ipv6_nd_prefix,
ipv6_nd_prefix_val_cmd,
"ipv6 nd prefix X:X::X:X/M (<0-4294967295>|infinite) "
"(<0-4294967295>|infinite)",
@@ -1024,6 +1330,15 @@
"Do not use prefix for onlink determination\n")
ALIAS (ipv6_nd_prefix,
+ ipv6_nd_prefix_noval_rtaddr_cmd,
+ "ipv6 nd prefix X:X::X:X/M (router-address|)",
+ "Interface IPv6 config commands\n"
+ "Neighbor discovery\n"
+ "Prefix information\n"
+ "IPv6 prefix\n"
+ "Set Router Address flag\n")
+
+ALIAS (ipv6_nd_prefix,
ipv6_nd_prefix_prefix_cmd,
"ipv6 nd prefix X:X::X:X/M",
"Interface IPv6 config commands\n"
@@ -1064,7 +1379,6 @@
return CMD_SUCCESS;
}
-
/* Write configuration about router advertisement. */
void
rtadv_config_write (struct vty *vty, struct interface *ifp)
@@ -1073,6 +1387,7 @@
struct listnode *node;
struct rtadv_prefix *rprefix;
u_char buf[INET6_ADDRSTRLEN];
+ int interval;
if (! rtadv)
return;
@@ -1087,8 +1402,14 @@
vty_out (vty, " ipv6 nd suppress-ra%s", VTY_NEWLINE);
}
- if (zif->rtadv.MaxRtrAdvInterval != RTADV_MAX_RTR_ADV_INTERVAL)
- vty_out (vty, " ipv6 nd ra-interval %d%s", zif->rtadv.MaxRtrAdvInterval,
+
+ interval = zif->rtadv.MaxRtrAdvInterval;
+ if (interval % 1000)
+ vty_out (vty, " ipv6 nd ra-interval msec %d%s", interval,
+ VTY_NEWLINE);
+ else
+ if (interval != RTADV_MAX_RTR_ADV_INTERVAL)
+ vty_out (vty, " ipv6 nd ra-interval %d%s", interval / 1000,
VTY_NEWLINE);
if (zif->rtadv.AdvDefaultLifetime != RTADV_ADV_DEFAULT_LIFETIME)
@@ -1128,6 +1449,8 @@
vty_out (vty, " off-link");
if (!rprefix->AdvAutonomousFlag)
vty_out (vty, " no-autoconfig");
+ if (rprefix->AdvRouterAddressFlag)
+ vty_out (vty, " router-address");
vty_out (vty, "%s", VTY_NEWLINE);
}
}
@@ -1162,6 +1485,11 @@
rtadv->ra_timer = thread_add_timer (zebrad.master, rtadv_timer, NULL,
val);
break;
+ case RTADV_TIMER_MSEC:
+ if (! rtadv->ra_timer)
+ rtadv->ra_timer = thread_add_timer_msec (zebrad.master, rtadv_timer,
+ NULL, val);
+ break;
case RTADV_READ:
if (! rtadv->ra_read)
rtadv->ra_read = thread_add_read (zebrad.master, rtadv_read, NULL, val);
@@ -1187,6 +1515,7 @@
install_element (INTERFACE_NODE, &ipv6_nd_suppress_ra_cmd);
install_element (INTERFACE_NODE, &no_ipv6_nd_suppress_ra_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_ra_interval_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_ra_interval_msec_cmd);
install_element (INTERFACE_NODE, &no_ipv6_nd_ra_interval_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_ra_lifetime_cmd);
install_element (INTERFACE_NODE, &no_ipv6_nd_ra_lifetime_cmd);
@@ -1196,15 +1525,27 @@
install_element (INTERFACE_NODE, &no_ipv6_nd_managed_config_flag_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_other_config_flag_cmd);
install_element (INTERFACE_NODE, &no_ipv6_nd_other_config_flag_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_homeagent_config_flag_cmd);
+ install_element (INTERFACE_NODE, &no_ipv6_nd_homeagent_config_flag_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_homeagent_preference_cmd);
+ install_element (INTERFACE_NODE, &no_ipv6_nd_homeagent_preference_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_homeagent_lifetime_cmd);
+ install_element (INTERFACE_NODE, &no_ipv6_nd_homeagent_lifetime_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_adv_interval_config_option_cmd);
+ install_element (INTERFACE_NODE, &no_ipv6_nd_adv_interval_config_option_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_prefix_val_rev_rtaddr_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_prefix_val_nortaddr_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_val_rev_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_val_noauto_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_val_offlink_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_prefix_val_rtaddr_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_val_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_noval_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_noval_rev_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_noval_noauto_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_noval_offlink_cmd);
+ install_element (INTERFACE_NODE, &ipv6_nd_prefix_noval_rtaddr_cmd);
install_element (INTERFACE_NODE, &ipv6_nd_prefix_prefix_cmd);
install_element (INTERFACE_NODE, &no_ipv6_nd_prefix_cmd);
}