static int link_set_dhcp_routes(Link *link) {
struct in_addr gateway, address;
_cleanup_free_ sd_dhcp_route **static_routes = NULL;
int r, n, i;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
if (!link->network->dhcp_use_routes)
return 0;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
if (r < 0 && r != -ENODATA)
return log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
if (r >= 0) {
_cleanup_route_free_ Route *route = NULL;
_cleanup_route_free_ Route *route_gw = NULL;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->protocol = RTPROT_DHCP;
r = route_new(&route_gw);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
/* The dhcp netmask may mask out the gateway. Add an explicit
* route for the gw host so that we can route no matter the
* netmask or existing kernel route tables. */
route_gw->family = AF_INET;
route_gw->dst.in = gateway;
route_gw->dst_prefixlen = 32;
route_gw->prefsrc.in = address;
route_gw->scope = RT_SCOPE_LINK;
route_gw->protocol = RTPROT_DHCP;
route_gw->priority = link->network->dhcp_route_metric;
route_gw->table = link->network->dhcp_route_table;
r = route_configure(route_gw, link, dhcp4_route_handler);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set host route: %m");
link->dhcp4_messages++;
route->family = AF_INET;
route->gw.in = gateway;
route->prefsrc.in = address;
route->priority = link->network->dhcp_route_metric;
route->table = link->network->dhcp_route_table;
r = route_configure(route, link, dhcp4_route_handler);
if (r < 0) {
log_link_warning_errno(link, r, "Could not set routes: %m");
link_enter_failed(link);
return r;
}
link->dhcp4_messages++;
}
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
if (n == -ENODATA)
return 0;
if (n < 0)
return log_link_warning_errno(link, n, "DHCP error: could not get routes: %m");
for (i = 0; i < n; i++) {
_cleanup_route_free_ Route *route = NULL;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->protocol = RTPROT_DHCP;
assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
route->priority = link->network->dhcp_route_metric;
route->table = link->network->dhcp_route_table;
route->scope = route_scope_from_address(route, &address);
r = route_configure(route, link, dhcp4_route_handler);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set host route: %m");
link->dhcp4_messages++;
}
return 0;
}
static int dhcp_lease_lost(Link *link) {
_cleanup_address_free_ Address *address = NULL;
struct in_addr addr;
struct in_addr netmask;
struct in_addr gateway;
unsigned prefixlen = 0;
int r;
assert(link);
assert(link->dhcp_lease);
log_link_warning(link, "DHCP lease lost");
if (link->network->dhcp_use_routes) {
_cleanup_free_ sd_dhcp_route **routes = NULL;
int n, i;
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &routes);
if (n >= 0) {
for (i = 0; i < n; i++) {
_cleanup_route_free_ Route *route = NULL;
r = route_new(&route);
if (r >= 0) {
route->family = AF_INET;
assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
route_remove(route, link,
link_route_remove_handler);
}
}
}
}
r = address_new(&address);
if (r >= 0) {
r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
if (r >= 0) {
_cleanup_route_free_ Route *route_gw = NULL;
_cleanup_route_free_ Route *route = NULL;
r = route_new(&route_gw);
if (r >= 0) {
route_gw->family = AF_INET;
route_gw->dst.in = gateway;
route_gw->dst_prefixlen = 32;
route_gw->scope = RT_SCOPE_LINK;
route_remove(route_gw, link,
link_route_remove_handler);
}
r = route_new(&route);
if (r >= 0) {
route->family = AF_INET;
route->gw.in = gateway;
route_remove(route, link,
link_route_remove_handler);
}
}
r = sd_dhcp_lease_get_address(link->dhcp_lease, &addr);
if (r >= 0) {
r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
if (r >= 0)
prefixlen = in_addr_netmask_to_prefixlen(&netmask);
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = prefixlen;
address_remove(address, link, link_address_remove_handler);
}
}
if (link->network->dhcp_use_mtu) {
uint16_t mtu;
r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
if (r >= 0 && link->original_mtu != mtu) {
r = link_set_mtu(link, link->original_mtu);
if (r < 0) {
log_link_warning(link,
"DHCP error: could not reset MTU");
link_enter_failed(link);
return r;
}
}
}
if (link->network->dhcp_use_hostname) {
const char *hostname = NULL;
if (link->network->dhcp_hostname)
hostname = link->network->dhcp_hostname;
else
(void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
if (hostname) {
/* If a hostname was set due to the lease, then unset it now. */
r = manager_set_hostname(link->manager, NULL);
if (r < 0)
log_link_warning_errno(link, r, "Failed to reset transient hostname: %m");
}
}
link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
link_dirty(link);
link->dhcp4_configured = false;
return 0;
}
static int link_set_dhcp_routes(Link *link) {
_cleanup_free_ sd_dhcp_route **static_routes = NULL;
bool classless_route = false, static_route = false;
const struct in_addr *router;
struct in_addr address;
int r, n, i;
uint32_t table;
assert(link);
if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
return 0;
if (!link->network) /* link went down while we configured the IP addresses? */
return 0;
if (!link->network->dhcp_use_routes)
return 0;
table = link_get_dhcp_route_table(link);
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
if (n == -ENODATA)
log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
else if (n < 0)
log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
for (i = 0; i < n; i++) {
switch (sd_dhcp_route_get_option(static_routes[i])) {
case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
classless_route = true;
break;
case SD_DHCP_OPTION_STATIC_ROUTE:
static_route = true;
break;
}
}
for (i = 0; i < n; i++) {
_cleanup_(route_freep) Route *route = NULL;
/* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
the DHCP client MUST ignore the Static Routes option. */
if (classless_route &&
sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
continue;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->protocol = RTPROT_DHCP;
assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
route->priority = link->network->dhcp_route_metric;
route->table = table;
route->scope = route_scope_from_address(route, &address);
r = route_configure(route, link, dhcp4_route_handler);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set host route: %m");
link->dhcp4_messages++;
}
r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
if (IN_SET(r, 0, -ENODATA))
log_link_info(link, "DHCP: No gateway received from DHCP server.");
else if (r < 0)
log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
else if (in4_addr_is_null(&router[0]))
log_link_info(link, "DHCP: Received gateway is null.");
/* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
a Router option, the DHCP client MUST ignore the Router option. */
if (classless_route && static_route)
log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
if (r > 0 && !classless_route && !in4_addr_is_null(&router[0])) {
_cleanup_(route_freep) Route *route = NULL, *route_gw = NULL;
r = route_new(&route_gw);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
/* The dhcp netmask may mask out the gateway. Add an explicit
* route for the gw host so that we can route no matter the
* netmask or existing kernel route tables. */
route_gw->family = AF_INET;
route_gw->dst.in = router[0];
route_gw->dst_prefixlen = 32;
route_gw->prefsrc.in = address;
route_gw->scope = RT_SCOPE_LINK;
route_gw->protocol = RTPROT_DHCP;
route_gw->priority = link->network->dhcp_route_metric;
route_gw->table = table;
r = route_configure(route_gw, link, dhcp4_route_handler);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set host route: %m");
link->dhcp4_messages++;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->gw.in = router[0];
route->prefsrc.in = address;
route->protocol = RTPROT_DHCP;
route->priority = link->network->dhcp_route_metric;
route->table = table;
r = route_configure(route, link, dhcp4_route_handler);
if (r < 0) {
log_link_warning_errno(link, r, "Could not set routes: %m");
link_enter_failed(link);
return r;
}
link->dhcp4_messages++;
}
return 0;
}
static NMIP4Config *
lease_to_ip4_config (const char *iface,
int ifindex,
sd_dhcp_lease *lease,
GHashTable *options,
guint32 default_priority,
gboolean log_lease,
GError **error)
{
NMIP4Config *ip4_config = NULL;
struct in_addr tmp_addr;
const struct in_addr *addr_list;
char buf[INET_ADDRSTRLEN];
const char *str;
guint32 lifetime = 0, i;
NMPlatformIP4Address address;
GString *l;
gs_free sd_dhcp_route **routes = NULL;
guint16 mtu;
int r, num;
guint64 end_time;
const void *data;
gsize data_len;
gboolean metered = FALSE;
gboolean static_default_gateway = FALSE;
g_return_val_if_fail (lease != NULL, NULL);
ip4_config = nm_ip4_config_new (ifindex);
/* Address */
sd_dhcp_lease_get_address (lease, &tmp_addr);
memset (&address, 0, sizeof (address));
address.address = tmp_addr.s_addr;
address.peer_address = tmp_addr.s_addr;
str = nm_utils_inet4_ntop (tmp_addr.s_addr, NULL);
LOG_LEASE (LOGD_DHCP4, " address %s", str);
add_option (options, dhcp4_requests, DHCP_OPTION_IP_ADDRESS, str);
/* Prefix/netmask */
sd_dhcp_lease_get_netmask (lease, &tmp_addr);
address.plen = nm_utils_ip4_netmask_to_prefix (tmp_addr.s_addr);
LOG_LEASE (LOGD_DHCP4, " plen %d", address.plen);
add_option (options,
dhcp4_requests,
SD_DHCP_OPTION_SUBNET_MASK,
nm_utils_inet4_ntop (tmp_addr.s_addr, NULL));
/* Lease time */
sd_dhcp_lease_get_lifetime (lease, &lifetime);
address.timestamp = nm_utils_get_monotonic_timestamp_s ();
address.lifetime = address.preferred = lifetime;
end_time = (guint64) time (NULL) + lifetime;
LOG_LEASE (LOGD_DHCP4, " expires in %" G_GUINT32_FORMAT " seconds", lifetime);
add_option_u64 (options,
dhcp4_requests,
SD_DHCP_OPTION_IP_ADDRESS_LEASE_TIME,
end_time);
address.addr_source = NM_IP_CONFIG_SOURCE_DHCP;
nm_ip4_config_add_address (ip4_config, &address);
/* DNS Servers */
num = sd_dhcp_lease_get_dns (lease, &addr_list);
if (num > 0) {
l = g_string_sized_new (30);
for (i = 0; i < num; i++) {
if (addr_list[i].s_addr) {
nm_ip4_config_add_nameserver (ip4_config, addr_list[i].s_addr);
str = nm_utils_inet4_ntop (addr_list[i].s_addr, NULL);
LOG_LEASE (LOGD_DHCP4, " nameserver '%s'", str);
g_string_append_printf (l, "%s%s", l->len ? " " : "", str);
}
}
if (l->len)
add_option (options, dhcp4_requests, SD_DHCP_OPTION_DOMAIN_NAME_SERVER, l->str);
g_string_free (l, TRUE);
}
/* Domain Name */
r = sd_dhcp_lease_get_domainname (lease, &str);
if (r == 0) {
/* Multiple domains sometimes stuffed into option 15 "Domain Name".
* As systemd escapes such characters, split them at \\032. */
char **domains = g_strsplit (str, "\\032", 0);
char **s;
for (s = domains; *s; s++) {
LOG_LEASE (LOGD_DHCP4, " domain name '%s'", *s);
nm_ip4_config_add_domain (ip4_config, *s);
}
g_strfreev (domains);
add_option (options, dhcp4_requests, SD_DHCP_OPTION_DOMAIN_NAME, str);
}
/* Hostname */
r = sd_dhcp_lease_get_hostname (lease, &str);
if (r == 0) {
LOG_LEASE (LOGD_DHCP4, " hostname '%s'", str);
add_option (options, dhcp4_requests, SD_DHCP_OPTION_HOST_NAME, str);
}
/* Routes */
num = sd_dhcp_lease_get_routes (lease, &routes);
if (num > 0) {
l = g_string_sized_new (30);
for (i = 0; i < num; i++) {
NMPlatformIP4Route route = { 0 };
const char *gw_str;
guint8 plen;
struct in_addr a;
if (sd_dhcp_route_get_destination (routes[i], &a) < 0)
continue;
route.network = a.s_addr;
if ( sd_dhcp_route_get_destination_prefix_length (routes[i], &plen) < 0
|| plen > 32)
continue;
route.plen = plen;
if (sd_dhcp_route_get_gateway (routes[i], &a) < 0)
continue;
route.gateway = a.s_addr;
if (route.plen) {
route.rt_source = NM_IP_CONFIG_SOURCE_DHCP;
route.metric = default_priority;
nm_ip4_config_add_route (ip4_config, &route);
str = nm_utils_inet4_ntop (route.network, buf);
gw_str = nm_utils_inet4_ntop (route.gateway, NULL);
LOG_LEASE (LOGD_DHCP4, " static route %s/%d gw %s", str, route.plen, gw_str);
g_string_append_printf (l, "%s%s/%d %s", l->len ? " " : "", str, route.plen, gw_str);
} else {
if (!static_default_gateway) {
static_default_gateway = TRUE;
nm_ip4_config_set_gateway (ip4_config, route.gateway);
str = nm_utils_inet4_ntop (route.gateway, NULL);
LOG_LEASE (LOGD_DHCP4, " gateway %s", str);
add_option (options, dhcp4_requests, SD_DHCP_OPTION_ROUTER, str);
}
}
}
if (l->len)
add_option (options, dhcp4_requests, SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE, l->str);
g_string_free (l, TRUE);
}
/* If the DHCP server returns both a Classless Static Routes option and a
* Router option, the DHCP client MUST ignore the Router option [RFC 3442].
* Be more lenient and ignore the Router option only if Classless Static
* Routes contain a default gateway (as other DHCP backends do).
*/
/* Gateway */
if (!static_default_gateway) {
r = sd_dhcp_lease_get_router (lease, &tmp_addr);
if (r == 0) {
nm_ip4_config_set_gateway (ip4_config, tmp_addr.s_addr);
str = nm_utils_inet4_ntop (tmp_addr.s_addr, NULL);
LOG_LEASE (LOGD_DHCP4, " gateway %s", str);
add_option (options, dhcp4_requests, SD_DHCP_OPTION_ROUTER, str);
}
}
/* MTU */
r = sd_dhcp_lease_get_mtu (lease, &mtu);
if (r == 0 && mtu) {
nm_ip4_config_set_mtu (ip4_config, mtu, NM_IP_CONFIG_SOURCE_DHCP);
add_option_u32 (options, dhcp4_requests, SD_DHCP_OPTION_INTERFACE_MTU, mtu);
LOG_LEASE (LOGD_DHCP4, " mtu %u", mtu);
}
/* NTP servers */
num = sd_dhcp_lease_get_ntp (lease, &addr_list);
if (num > 0) {
l = g_string_sized_new (30);
for (i = 0; i < num; i++) {
str = nm_utils_inet4_ntop (addr_list[i].s_addr, buf);
LOG_LEASE (LOGD_DHCP4, " ntp server '%s'", str);
g_string_append_printf (l, "%s%s", l->len ? " " : "", str);
}
add_option (options, dhcp4_requests, SD_DHCP_OPTION_NTP_SERVER, l->str);
g_string_free (l, TRUE);
}
r = sd_dhcp_lease_get_vendor_specific (lease, &data, &data_len);
if (r >= 0)
metered = !!memmem (data, data_len, "ANDROID_METERED", NM_STRLEN ("ANDROID_METERED"));
nm_ip4_config_set_metered (ip4_config, metered);
return ip4_config;
}
static int link_set_dhcp_routes(Link *link) {
_cleanup_free_ sd_dhcp_route **static_routes = NULL;
bool classless_route = false, static_route = false;
struct in_addr gateway, address;
int r, n, i;
uint32_t table;
assert(link);
if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
return 0;
if (!link->network) /* link went down while we configured the IP addresses? */
return 0;
if (!link->network->dhcp_use_routes)
return 0;
/* When the interface is part of an VRF use the VRFs routing table, unless
* there is a another table specified. */
table = link->network->dhcp_route_table;
if (!link->network->dhcp_route_table_set && link->network->vrf != NULL)
table = VRF(link->network->vrf)->table;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
if (n < 0)
log_link_debug_errno(link, n, "DHCP error: could not get routes: %m");
for (i = 0; i < n; i++) {
if (static_routes[i]->option == SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
classless_route = true;
if (static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE)
static_route = true;
}
for (i = 0; i < n; i++) {
_cleanup_route_free_ Route *route = NULL;
/* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
the DHCP client MUST ignore the Static Routes option. */
if (classless_route && static_routes[i]->option == SD_DHCP_OPTION_STATIC_ROUTE)
continue;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->protocol = RTPROT_DHCP;
assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
route->priority = link->network->dhcp_route_metric;
route->table = table;
route->scope = route_scope_from_address(route, &address);
r = route_configure(route, link, dhcp4_route_handler);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set host route: %m");
link->dhcp4_messages++;
}
r = sd_dhcp_lease_get_router(link->dhcp_lease, &gateway);
if (r == -ENODATA)
log_link_info_errno(link, r, "DHCP: No routes received from DHCP server: %m");
else if (r < 0)
log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
/* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
a Router option, the DHCP client MUST ignore the Router option. */
if (classless_route && static_route)
log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
if (r >= 0 && !classless_route) {
_cleanup_route_free_ Route *route = NULL;
_cleanup_route_free_ Route *route_gw = NULL;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->protocol = RTPROT_DHCP;
r = route_new(&route_gw);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
/* The dhcp netmask may mask out the gateway. Add an explicit
* route for the gw host so that we can route no matter the
* netmask or existing kernel route tables. */
route_gw->family = AF_INET;
route_gw->dst.in = gateway;
route_gw->dst_prefixlen = 32;
route_gw->prefsrc.in = address;
route_gw->scope = RT_SCOPE_LINK;
route_gw->protocol = RTPROT_DHCP;
route_gw->priority = link->network->dhcp_route_metric;
route_gw->table = table;
r = route_configure(route_gw, link, dhcp4_route_handler);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set host route: %m");
link->dhcp4_messages++;
route->family = AF_INET;
route->gw.in = gateway;
route->prefsrc.in = address;
route->priority = link->network->dhcp_route_metric;
route->table = table;
r = route_configure(route, link, dhcp4_route_handler);
if (r < 0) {
log_link_warning_errno(link, r, "Could not set routes: %m");
link_enter_failed(link);
return r;
}
link->dhcp4_messages++;
}
return 0;
}
