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core: Add host route for DHCP4 server if outside assigned subnet (bgo #721767)

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Some ISP's provide leases from central servers that are on different
subnets that the address offered.  If the host does not configure the
interface as the default route, the dhcp server may not be reachable
via unicast, and a host specific route is needed.

https://bugzilla.gnome.org/show_bug.cgi?id=721767
https://bugzilla.redhat.com/show_bug.cgi?id=983325

Signed-off-by: Thomas Haller <thaller@redhat.com>
This commit is contained in:
Scott Shambarger 2014-01-09 14:26:53 -08:00 • committed by Thomas Haller
parent 2b461bfa19
commit 31fe84e467
1 changed files with 37 additions and 2 deletions
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39
src/dhcp-manager/nm-dhcp-client.c
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@ -1200,8 +1200,8 @@ ip4_options_to_config (NMDHCPClient *self)
for (s = routers; *s; s++) {
/* FIXME: how to handle multiple routers? */
if (inet_pton (AF_INET, *s, &tmp_addr) > 0) {
nm_ip4_config_set_gateway (ip4_config, tmp_addr);
if (inet_pton (AF_INET, *s, &gwaddr) > 0) {
nm_ip4_config_set_gateway (ip4_config, gwaddr);
nm_log_info (LOGD_DHCP4, " gateway %s", *s);
break;
} else
@ -1211,6 +1211,41 @@ ip4_options_to_config (NMDHCPClient *self)
}
}
/*
* RFC 2132, section 9.7
* DHCP clients use the contents of the 'server identifier' field
* as the destination address for any DHCP messages unicast to
* the DHCP server.
*
* Some ISP's provide leases from central servers that are on
* different subnets that the address offered. If the host
* does not configure the interface as the default route, the
* dhcp server may not be reachable via unicast, and a host
* specific route is needed.
**/
str = g_hash_table_lookup (priv->options, "new_dhcp_server_identifier");
if (str) {
if (inet_pton (AF_INET, str, &tmp_addr) > 0) {
NMPlatformIP4Route route;
guint32 mask = nm_utils_ip4_prefix_to_netmask (address.plen);
nm_log_info (LOGD_DHCP4, " server identifier %s", str);
if ((tmp_addr & mask) != (address.address & mask)) {
/* DHCP server not on assigned subnet, route needed */
memset (&route, 0, sizeof (route));
route.network = tmp_addr;
route.plen = 32;
/* this will be a device route if gwaddr is 0 */
route.gateway = gwaddr;
nm_ip4_config_add_route (ip4_config, &route);
nm_log_dbg (LOGD_IP, "adding route for server identifier: %s",
nm_platform_ip4_route_to_string (&route));
}
}
else
nm_log_warn (LOGD_DHCP4, "ignoring invalid server identifier '%s'", str);
}
str = g_hash_table_lookup (priv->options, "new_dhcp_lease_time");
if (str) {
address.lifetime = address.preferred = strtoul (str, NULL, 10);