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authorDave Barach <dave@barachs.net>2019-11-10 15:46:31 -0500
committerDave Barach <dave@barachs.net>2019-11-10 15:54:28 -0500
commitd318a996b7bdcf0246b2d9927a918a3773a88fa6 (patch)
tree6af0ec47f6f1093c42c85140c7be118b77a01ce1 /src/plugins/dhcp
parentf83194c2f45bcc736edc8246b510a29c1df15756 (diff)
dhcp: ipv6 prefix delegation improvements
Autoconfigure router advertisements for delegated prefixes. Clean up a longstanding issue. If vpp receives a dhcpv6 renew reply, do NOT reset per-delegated-prefix timers. That prevented vpp from sending a solicit to renew the delegation on time. That, in turn caused the RA code to send advertisements with valid_time = preferred_time = 0. That causes almost any downstream client to throw away its delegated address. Miscellaneous changes o src/vnet/ip/ip6_neighbor.c - always memset elements allocated from pools to zero. DGMS. o Remove debug spew from the ipv6 connection-tracker plugin Type: feature Signed-off-by: Dave Barach <dave@barachs.net> Change-Id: I428feccdc47efdc413898600e0d62916928a6eb7
Diffstat (limited to 'src/plugins/dhcp')
-rw-r--r--src/plugins/dhcp/dhcp6_pd_client_cp.c106
1 files changed, 96 insertions, 10 deletions
diff --git a/src/plugins/dhcp/dhcp6_pd_client_cp.c b/src/plugins/dhcp/dhcp6_pd_client_cp.c
index 45921d34f97..14f127d7cf8 100644
--- a/src/plugins/dhcp/dhcp6_pd_client_cp.c
+++ b/src/plugins/dhcp/dhcp6_pd_client_cp.c
@@ -19,6 +19,7 @@
#include <dhcp/dhcp6_pd_client_dp.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip6.h>
+#include <vnet/ip/ip6_neighbor.h>
#include <float.h>
#include <math.h>
#include <string.h>
@@ -412,11 +413,15 @@ dhcp6_pd_reply_event_handler (vl_api_dhcp6_pd_reply_event_t * mp)
if (address_prefix_present)
{
- prefix_info->preferred_lt = preferred_time;
- prefix_info->valid_lt = valid_time;
- prefix_info->due_time = current_time + valid_time;
- if (prefix_info->due_time > rm->max_valid_due_time)
- rm->max_valid_due_time = prefix_info->due_time;
+ /*
+ * We found the prefix. Move along.
+ * Don't touch the prefix timers!
+ * If we happen to receive a renew reply just before we
+ * would have sent a solicit to renew the prefix delegation,
+ * we forget to renew the delegation. Worse luck, we start
+ * sending router advertisements with a valid time of zero,
+ * and the wheels fall off...
+ */
continue;
}
@@ -685,7 +690,16 @@ cp_ip6_address_add_del_now (ip6_address_info_t * address_info, u8 is_add)
clib_warning ("Failed adding IPv6 address: %U",
format_clib_error, error);
else
- address_info->configured_in_data_plane = 1;
+ {
+ if (CLIB_DEBUG > 0)
+ clib_warning ("Add address %U on %U",
+ format_ip6_address_and_length,
+ &addr, address_info->prefix_length,
+ format_vnet_sw_if_index_name,
+ vnet_get_main (), address_info->sw_if_index);
+
+ address_info->configured_in_data_plane = 1;
+ }
}
else
{
@@ -700,7 +714,17 @@ cp_ip6_address_add_del_now (ip6_address_info_t * address_info, u8 is_add)
clib_warning ("Failed adding IPv6 address: %U",
format_clib_error, error);
else
- address_info->configured_in_data_plane = 1;
+ {
+ if (CLIB_DEBUG > 0)
+ clib_warning ("Add address %U on %U",
+ format_ip6_address_and_length,
+ &addr, address_info->prefix_length,
+ format_vnet_sw_if_index_name,
+ vnet_get_main (),
+ address_info->sw_if_index);
+
+ address_info->configured_in_data_plane = 1;
+ }
}
}
}
@@ -760,6 +784,54 @@ cp_ip6_address_find_new_active_prefix (u32 prefix_group_index,
}
static void
+cp_ip6_advertise_prefix (prefix_info_t * prefix_info,
+ ip6_address_info_t * address_info, int enable)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ ip6_main_t *im = &ip6_main;
+ u32 prefix_index;
+ ip6_address_t addr;
+ int rv;
+
+ prefix_index =
+ active_prefix_index_by_prefix_group_index_get
+ (address_info->prefix_group_index);
+
+ if (cp_ip6_construct_address (address_info, prefix_index, &addr) != 0)
+ {
+ clib_warning ("address construction FAIL");
+ return;
+ }
+
+ /* The RA code assumes that host bits are zero, so clear them */
+ addr.as_u64[0] &= im->fib_masks[address_info->prefix_length].as_u64[0];
+ addr.as_u64[1] &= im->fib_masks[address_info->prefix_length].as_u64[1];
+
+ rv = ip6_neighbor_ra_prefix (vm, address_info->sw_if_index,
+ &addr, address_info->prefix_length,
+ 0 /* use_default */ ,
+ prefix_info->valid_lt,
+ prefix_info->preferred_lt,
+ 0 /* no_advertise */ ,
+ 0 /* off_link */ ,
+ 0 /* no_autoconfig */ ,
+ 0 /* no_onlink */ ,
+ enable == 0 /* is_no */ );
+ if (rv != 0)
+ {
+ clib_warning ("ip6_neighbor_ra_prefix returned %d", rv);
+ return;
+ }
+
+ if (CLIB_DEBUG > 0)
+ clib_warning ("Advertise prefix %U valid lt %u preferred lt %u",
+ format_ip6_address_and_length, &addr,
+ address_info->prefix_length, prefix_info->valid_lt,
+ prefix_info->preferred_lt);
+}
+
+
+static void
cp_ip6_address_prefix_add_del_handler (u32 prefix_index, u8 is_add)
{
ip6_address_with_prefix_main_t *apm = &ip6_address_with_prefix_main;
@@ -784,7 +856,13 @@ cp_ip6_address_prefix_add_del_handler (u32 prefix_index, u8 is_add)
{
address_info = &apm->addresses[i];
if (address_info->prefix_group_index == prefix_group_index)
- cp_ip6_address_add_del_now (address_info, 1 /* add */ );
+ {
+ /* Add the prefix to the interface */
+ cp_ip6_address_add_del_now (address_info, 1 /* add */ );
+ /* And advertise the prefix on the interface */
+ cp_ip6_advertise_prefix (prefix, address_info,
+ 1 /* enable */ );
+ }
}
}
}
@@ -797,7 +875,11 @@ cp_ip6_address_prefix_add_del_handler (u32 prefix_index, u8 is_add)
{
address_info = &apm->addresses[i];
if (address_info->prefix_group_index == prefix_group_index)
- cp_ip6_address_add_del_now (address_info, 0 /* del */ );
+ {
+ cp_ip6_advertise_prefix (prefix, address_info,
+ 0 /* enable */ );
+ cp_ip6_address_add_del_now (address_info, 0 /* del */ );
+ }
}
active_prefix_index_by_prefix_group_index_set
(prefix_group_index, ~0);
@@ -812,7 +894,11 @@ cp_ip6_address_prefix_add_del_handler (u32 prefix_index, u8 is_add)
{
address_info = &apm->addresses[i];
if (address_info->prefix_group_index == prefix_group_index)
- cp_ip6_address_add_del_now (address_info, 1 /* add */ );
+ {
+ cp_ip6_address_add_del_now (address_info, 1 /* add */ );
+ cp_ip6_advertise_prefix (prefix, address_info,
+ 1 /* enable */ );
+ }
}
}
}