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cloud-setup/azure: fix detecting the gateway address

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The code never set "iface_get_config->cidr_addr", despite
setting "cidr_prefix" and "has_cidr". As a result, cloud-setup
would think that the subnet is "0.0.0.0/$PLEN", and calculate
the gateway as "0.0.0.1".

As a result it would add a default route to table 30400 via 0.0.0.1,
which is obviously wrong.

How to detect the right gateway? Let's try obtain the subnet also via
the meta data. That seems mostly correct, except that we only access
subnet at index 0. What if there are multiple ones? I don't know.

https://bugzilla.redhat.com/show_bug.cgi?id=1912236
(cherry picked from commit c2629f72b0)
This commit is contained in:
Thomas Haller 2021-04-20 10:52:04 +02:00 • committed by Ana Cabral
parent 783d470b6f
commit 5d112092bc
2 changed files with 48 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

45
clients/cloud-setup/nmcs-provider-azure.c
View file

@ -95,6 +95,7 @@ detect(NMCSProvider *provider, GTask *task)
typedef enum {
GET_CONFIG_FETCH_TYPE_IPV4_IPADDRESS_X_PRIVATEIPADDRESS,
GET_CONFIG_FETCH_TYPE_IPV4_SUBNET_0_ADDRESS,
GET_CONFIG_FETCH_TYPE_IPV4_SUBNET_0_PREFIX,
} GetConfigFetchType;
@ -158,6 +159,18 @@ _get_config_fetch_done_cb(NMHttpClient * http_client,
iface_get_config->ipv4s_len++;
break;
case GET_CONFIG_FETCH_TYPE_IPV4_SUBNET_0_ADDRESS:
if (!nmcs_utils_ipaddr_normalize_bin(AF_INET, resp_str, resp_len, NULL, &tmp_addr)) {
error = nm_utils_error_new(NM_UTILS_ERROR_UNKNOWN, "ip is not a subnet address");
goto out_done;
}
_LOGD("interface[%" G_GSSIZE_FORMAT "]: received subnet address %s",
iface_data->intern_iface_idx,
_nm_utils_inet4_ntop(tmp_addr, tmp_addr_str));
iface_get_config->cidr_addr = tmp_addr;
break;
case GET_CONFIG_FETCH_TYPE_IPV4_SUBNET_0_PREFIX:
tmp_prefix = _nm_utils_ascii_str_to_int64_bin(resp_str, resp_len, 10, 0, 32, -1);
@ -180,6 +193,10 @@ out_done:
--iface_data->n_iface_data_pending;
if (iface_data->n_iface_data_pending > 0)
return;
/* we surely have cidr_addr and cidr_prefix, otherwise
* we would have errored out above. */
iface_get_config->has_cidr = TRUE;
}
--get_config_data->n_pending;
@ -197,6 +214,17 @@ _get_config_fetch_done_cb_ipv4_ipaddress_x_privateipaddress(GObject * source
GET_CONFIG_FETCH_TYPE_IPV4_IPADDRESS_X_PRIVATEIPADDRESS);
}
static void
_get_config_fetch_done_cb_ipv4_subnet_0_address(GObject * source,
GAsyncResult *result,
gpointer user_data)
{
_get_config_fetch_done_cb(NM_HTTP_CLIENT(source),
result,
user_data,
GET_CONFIG_FETCH_TYPE_IPV4_SUBNET_0_ADDRESS);
}
static void
_get_config_fetch_done_cb_ipv4_subnet_0_prefix(GObject * source,
GAsyncResult *result,
@ -287,6 +315,23 @@ _get_config_ips_prefix_list_cb(GObject *source, GAsyncResult *result, gpointer u
{
gs_free char *uri = NULL;
iface_data->n_iface_data_pending++;
nm_http_client_poll_get(
NM_HTTP_CLIENT(source),
(uri = _azure_uri_interfaces(iface_idx_str, "/ipv4/subnet/0/address/")),
HTTP_TIMEOUT_MS,
512 * 1024,
10000,
1000,
NM_MAKE_STRV(NM_AZURE_METADATA_HEADER),
get_config_data->intern_cancellable,
NULL,
NULL,
_get_config_fetch_done_cb_ipv4_subnet_0_address,
iface_data);
nm_clear_g_free(&uri);
iface_data->n_iface_data_pending++;
nm_http_client_poll_get(
NM_HTTP_CLIENT(source),

4
man/nm-cloud-setup.xml
View file

@ -329,7 +329,9 @@
<listitem>
<para>Then, for each IP address index fetch the address at
<literal>http://169.254.169.254/metadata/instance/network/interface/$IFACE_INDEX/ipv4/ipAddress/$ADDR_INDEX/privateIpAddress?format=text&amp;api-version=2017-04-02</literal>.
Also fetch the size of the subnet (the netmask) for the interface from
Also fetch the size of the subnet and prefix for the interface from
<literal>http://169.254.169.254/metadata/instance/network/interface/$IFACE_INDEX/ipv4/subnet/0/address/?format=text&amp;api-version=2017-04-02</literal>.
and
<literal>http://169.254.169.254/metadata/instance/network/interface/$IFACE_INDEX/ipv4/subnet/0/prefix/?format=text&amp;api-version=2017-04-02</literal>.
</para>
</listitem>