blob: f80adcdbcfef2289457906e07d22aadb692df3b6 [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <netinet/in.h>
#include <netinet/ip.h>
#include <linux/if.h>
#include <linux/if_arp.h>
#include "escape.h"
#include "alloc-util.h"
#include "dhcp-client-internal.h"
#include "hostname-setup.h"
#include "hostname-util.h"
#include "parse-util.h"
#include "network-internal.h"
#include "networkd-address.h"
#include "networkd-dhcp4.h"
#include "networkd-ipv4acd.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "networkd-nexthop.h"
#include "networkd-queue.h"
#include "networkd-route.h"
#include "networkd-setlink.h"
#include "networkd-state-file.h"
#include "string-table.h"
#include "strv.h"
#include "sysctl-util.h"
#include "web-util.h"
static int dhcp4_request_address_and_routes(Link *link, bool announce);
static int dhcp4_remove_all(Link *link);
void network_adjust_dhcp4(Network *network) {
assert(network);
if (!FLAGS_SET(network->dhcp, ADDRESS_FAMILY_IPV4))
return;
if (network->dhcp_use_gateway < 0)
network->dhcp_use_gateway = network->dhcp_use_routes;
/* RFC7844 section 3.: MAY contain the Client Identifier option
* Section 3.5: clients MUST use client identifiers based solely on the link-layer address
* NOTE: Using MAC, as it does not reveal extra information, and some servers might not answer
* if this option is not sent */
if (network->dhcp_anonymize &&
network->dhcp_client_identifier >= 0 &&
network->dhcp_client_identifier != DHCP_CLIENT_ID_MAC) {
log_warning("%s: ClientIdentifier= is set, although Anonymize=yes. Using ClientIdentifier=mac.",
network->filename);
network->dhcp_client_identifier = DHCP_CLIENT_ID_MAC;
}
if (network->dhcp_client_identifier < 0)
network->dhcp_client_identifier = network->dhcp_anonymize ? DHCP_CLIENT_ID_MAC : DHCP_CLIENT_ID_DUID;
}
static int dhcp4_release_old_lease(Link *link) {
Route *route;
int k, r = 0;
assert(link);
if (!link->dhcp_address_old && set_isempty(link->dhcp_routes_old))
return 0;
log_link_debug(link, "Removing old DHCPv4 address and routes.");
SET_FOREACH(route, link->dhcp_routes_old) {
k = route_remove(route, NULL, link);
if (k < 0)
r = k;
}
if (link->dhcp_address_old) {
k = address_remove(link->dhcp_address_old, link);
if (k < 0)
r = k;
}
return r;
}
static void dhcp4_check_ready(Link *link) {
int r;
if (link->dhcp4_messages > 0) {
log_link_debug(link, "%s(): DHCPv4 address and routes are not set.", __func__);
return;
}
if (!link->dhcp_address) {
log_link_debug(link, "%s(): DHCPv4 address is not set.", __func__);
return;
}
if (!address_is_ready(link->dhcp_address)) {
log_link_debug(link, "%s(): DHCPv4 address is not ready.", __func__);
return;
}
link->dhcp4_configured = true;
/* New address and routes are configured now. Let's release old lease. */
r = dhcp4_release_old_lease(link);
if (r < 0) {
link_enter_failed(link);
return;
}
r = sd_ipv4ll_stop(link->ipv4ll);
if (r < 0)
log_link_warning_errno(link, r, "Failed to drop IPv4 link-local address, ignoring: %m");
link_check_ready(link);
}
static int dhcp4_after_route_configure(Request *req, void *object) {
Route *route = object;
Link *link;
int r;
assert(req);
assert(req->link);
assert(req->type == REQUEST_TYPE_ROUTE);
assert(route);
link = req->link;
r = set_ensure_put(&link->dhcp_routes, &route_hash_ops, route);
if (r < 0)
return log_link_error_errno(link, r, "Failed to store DHCPv4 route: %m");
set_remove(link->dhcp_routes_old, route);
return 0;
}
static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
assert(link->dhcp4_messages > 0);
link->dhcp4_messages--;
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r == -ENETUNREACH && !link->dhcp4_route_retrying) {
/* It seems kernel does not support that the prefix route cannot be configured with
* route table. Let's once drop the config and reconfigure them later. */
log_link_message_debug_errno(link, m, r, "Could not set DHCPv4 route, retrying later");
link->dhcp4_route_failed = true;
link->manager->dhcp4_prefix_root_cannot_set_table = true;
} else if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "Could not set DHCPv4 route");
link_enter_failed(link);
return 1;
}
if (link->dhcp4_messages == 0 && link->dhcp4_route_failed) {
link->dhcp4_route_failed = false;
link->dhcp4_route_retrying = true;
r = dhcp4_remove_all(link);
if (r < 0)
link_enter_failed(link);
r = link_request_static_nexthops(link, true);
if (r < 0)
link_enter_failed(link);
r = link_request_static_routes(link, true);
if (r < 0)
link_enter_failed(link);
r = dhcp4_request_address_and_routes(link, false);
if (r < 0)
link_enter_failed(link);
return 1;
}
dhcp4_check_ready(link);
return 1;
}
static int dhcp4_request_route(Route *in, Link *link) {
_cleanup_(route_freep) Route *route = in;
Request *req;
int r;
assert(route);
assert(link);
r = link_has_route(link, route);
if (r < 0)
return r;
if (r == 0)
link->dhcp4_configured = false;
r = link_request_route(link, TAKE_PTR(route), true, &link->dhcp4_messages,
dhcp4_route_handler, &req);
if (r <= 0)
return r;
req->after_configure = dhcp4_after_route_configure;
return 0;
}
static bool link_prefixroute(Link *link) {
return !link->network->dhcp_route_table_set ||
link->network->dhcp_route_table == RT_TABLE_MAIN ||
link->manager->dhcp4_prefix_root_cannot_set_table;
}
static int dhcp4_request_prefix_route(Link *link) {
_cleanup_(route_freep) Route *route = NULL;
struct in_addr address, netmask;
int r;
assert(link);
assert(link->dhcp_lease);
if (link_prefixroute(link))
/* When true, the route will be created by kernel. See dhcp4_update_address(). */
return 0;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return r;
r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
if (r < 0)
return r;
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET;
route->dst.in.s_addr = address.s_addr & netmask.s_addr;
route->dst_prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
route->prefsrc.in = address;
route->scope = RT_SCOPE_LINK;
route->protocol = RTPROT_DHCP;
route->table = link_get_dhcp_route_table(link);
route->mtu = link->network->dhcp_route_mtu;
return dhcp4_request_route(TAKE_PTR(route), link);
}
static int dhcp4_request_route_to_gateway(Link *link, const struct in_addr *gw) {
_cleanup_(route_freep) Route *route = NULL;
struct in_addr address;
int r;
assert(link);
assert(link->dhcp_lease);
assert(gw);
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return r;
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET;
route->dst.in = *gw;
route->dst_prefixlen = 32;
route->prefsrc.in = address;
route->scope = RT_SCOPE_LINK;
route->protocol = RTPROT_DHCP;
route->priority = link->network->dhcp_route_metric;
route->table = link_get_dhcp_route_table(link);
route->mtu = link->network->dhcp_route_mtu;
return dhcp4_request_route(TAKE_PTR(route), link);
}
static int dhcp4_request_route_auto(
Route *in,
Link *link,
const struct in_addr *gw) {
_cleanup_(route_freep) Route *route = in;
struct in_addr address, netmask, prefix;
uint8_t prefixlen;
int r;
assert(route);
assert(link);
assert(link->dhcp_lease);
assert(gw);
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return r;
r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
if (r < 0)
return r;
prefix.s_addr = address.s_addr & netmask.s_addr;
prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
if (in4_addr_is_localhost(&route->dst.in)) {
if (in4_addr_is_set(gw))
log_link_debug(link, "DHCP: requested route destination "IPV4_ADDRESS_FMT_STR"/%u is localhost, "
"ignoring gateway address "IPV4_ADDRESS_FMT_STR,
IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen, IPV4_ADDRESS_FMT_VAL(*gw));
route->scope = RT_SCOPE_HOST;
route->gw_family = AF_UNSPEC;
route->gw = IN_ADDR_NULL;
route->prefsrc = IN_ADDR_NULL;
} else if (in4_addr_equal(&route->dst.in, &address)) {
if (in4_addr_is_set(gw))
log_link_debug(link, "DHCP: requested route destination "IPV4_ADDRESS_FMT_STR"/%u is equivalent to the acquired address, "
"ignoring gateway address "IPV4_ADDRESS_FMT_STR,
IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen, IPV4_ADDRESS_FMT_VAL(*gw));
route->scope = RT_SCOPE_HOST;
route->gw_family = AF_UNSPEC;
route->gw = IN_ADDR_NULL;
route->prefsrc.in = address;
} else if (route->dst_prefixlen >= prefixlen &&
(route->dst.in.s_addr & netmask.s_addr) == prefix.s_addr) {
if (in4_addr_is_set(gw))
log_link_debug(link, "DHCP: requested route destination "IPV4_ADDRESS_FMT_STR"/%u is in the assigned network "
IPV4_ADDRESS_FMT_STR"/%u, ignoring gateway address "IPV4_ADDRESS_FMT_STR,
IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen,
IPV4_ADDRESS_FMT_VAL(prefix), prefixlen,
IPV4_ADDRESS_FMT_VAL(*gw));
route->scope = RT_SCOPE_LINK;
route->gw_family = AF_UNSPEC;
route->gw = IN_ADDR_NULL;
route->prefsrc.in = address;
} else {
if (in4_addr_is_null(gw)) {
log_link_debug(link, "DHCP: requested route destination "IPV4_ADDRESS_FMT_STR"/%u is not in the assigned network "
IPV4_ADDRESS_FMT_STR"/%u, but no gateway is specified, ignoring.",
IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen,
IPV4_ADDRESS_FMT_VAL(prefix), prefixlen);
return 0;
}
r = dhcp4_request_route_to_gateway(link, gw);
if (r < 0)
return r;
route->scope = RT_SCOPE_UNIVERSE;
route->gw_family = AF_INET;
route->gw.in = *gw;
route->prefsrc.in = address;
}
return dhcp4_request_route(TAKE_PTR(route), link);
}
static int dhcp4_request_static_routes(Link *link, struct in_addr *ret_default_gw) {
_cleanup_free_ sd_dhcp_route **static_routes = NULL;
bool classless_route = false, static_route = false;
struct in_addr default_gw = {};
int n, r;
assert(link);
assert(link->dhcp_lease);
assert(ret_default_gw);
if (!link->network->dhcp_use_routes)
return 0;
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
if (IN_SET(n, 0, -ENODATA)) {
log_link_debug(link, "DHCP: No static routes received from DHCP server.");
return 0;
}
if (n < 0)
return n;
for (int 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;
}
}
/* 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_route)
log_link_debug(link, "Classless static routes received from DHCP server: ignoring static-route option");
for (int i = 0; i < n; i++) {
_cleanup_(route_freep) Route *route = NULL;
struct in_addr gw;
if (sd_dhcp_route_get_option(static_routes[i]) !=
(classless_route ? SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE : SD_DHCP_OPTION_STATIC_ROUTE))
continue;
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET;
route->gw_family = AF_INET;
route->protocol = RTPROT_DHCP;
route->priority = link->network->dhcp_route_metric;
route->table = link_get_dhcp_route_table(link);
route->mtu = link->network->dhcp_route_mtu;
r = sd_dhcp_route_get_gateway(static_routes[i], &gw);
if (r < 0)
return r;
r = sd_dhcp_route_get_destination(static_routes[i], &route->dst.in);
if (r < 0)
return r;
r = sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen);
if (r < 0)
return r;
/* When classless static routes are provided, then router option will be ignored. To
* use the default gateway later in other routes, e.g., routes to dns servers, here we
* need to find the default gateway in the classless static routes. */
if (classless_route &&
in4_addr_is_null(&route->dst.in) && route->dst_prefixlen == 0 &&
in4_addr_is_null(&default_gw))
default_gw = gw;
r = dhcp4_request_route_auto(TAKE_PTR(route), link, &gw);
if (r < 0)
return r;
}
*ret_default_gw = default_gw;
return classless_route;
}
static int dhcp4_request_gateway(Link *link, struct in_addr *ret_gw) {
_cleanup_(route_freep) Route *route = NULL;
const struct in_addr *router;
struct in_addr address;
Route *rt;
int r;
assert(link);
assert(link->dhcp_lease);
assert(ret_gw);
if (!link->network->dhcp_use_gateway)
return 0;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return r;
r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
if (IN_SET(r, 0, -ENODATA)) {
log_link_debug(link, "DHCP: No gateway received from DHCP server.");
return 0;
}
if (r < 0)
return r;
if (in4_addr_is_null(&router[0])) {
log_link_debug(link, "DHCP: Received gateway address is null.");
return 0;
}
/* The dhcp netmask may mask out the gateway. First, add an explicit route for the gateway host
* so that we can route no matter the netmask or existing kernel route tables. */
r = dhcp4_request_route_to_gateway(link, &router[0]);
if (r < 0)
return r;
r = route_new(&route);
if (r < 0)
return r;
/* Next, add a default gateway. */
route->family = AF_INET;
route->gw_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 = link_get_dhcp_route_table(link);
route->mtu = link->network->dhcp_route_mtu;
r = dhcp4_request_route(TAKE_PTR(route), link);
if (r < 0)
return r;
HASHMAP_FOREACH(rt, link->network->routes_by_section) {
if (!rt->gateway_from_dhcp_or_ra)
continue;
if (rt->gw_family != AF_INET)
continue;
r = route_dup(rt, &route);
if (r < 0)
return r;
route->gw.in = router[0];
if (!route->protocol_set)
route->protocol = RTPROT_DHCP;
if (!route->priority_set)
route->priority = link->network->dhcp_route_metric;
if (!route->table_set)
route->table = link_get_dhcp_route_table(link);
if (route->mtu == 0)
route->mtu = link->network->dhcp_route_mtu;
r = dhcp4_request_route(TAKE_PTR(route), link);
if (r < 0)
return r;
}
*ret_gw = router[0];
return 0;
}
static int dhcp4_request_routes_to_servers(
Link *link,
const struct in_addr *servers,
size_t n_servers,
const struct in_addr *gw) {
int r;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
assert(servers || n_servers == 0);
assert(gw);
for (size_t i = 0; i < n_servers; i++) {
_cleanup_(route_freep) Route *route = NULL;
if (in4_addr_is_null(&servers[i]))
continue;
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET;
route->dst.in = servers[i];
route->dst_prefixlen = 32;
route->protocol = RTPROT_DHCP;
route->priority = link->network->dhcp_route_metric;
route->table = link_get_dhcp_route_table(link);
route->mtu = link->network->dhcp_route_mtu;
r = dhcp4_request_route_auto(TAKE_PTR(route), link, gw);
if (r < 0)
return r;
}
return 0;
}
static int dhcp4_request_routes_to_dns(Link *link, const struct in_addr *gw) {
const struct in_addr *dns;
int r;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
assert(gw);
if (!link->network->dhcp_use_dns ||
!link->network->dhcp_routes_to_dns)
return 0;
r = sd_dhcp_lease_get_dns(link->dhcp_lease, &dns);
if (IN_SET(r, 0, -ENODATA))
return 0;
if (r < 0)
return r;
return dhcp4_request_routes_to_servers(link, dns, r, gw);
}
static int dhcp4_request_routes_to_ntp(Link *link, const struct in_addr *gw) {
const struct in_addr *ntp;
int r;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
assert(gw);
if (!link->network->dhcp_use_ntp ||
!link->network->dhcp_routes_to_ntp)
return 0;
r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &ntp);
if (IN_SET(r, 0, -ENODATA))
return 0;
if (r < 0)
return r;
return dhcp4_request_routes_to_servers(link, ntp, r, gw);
}
static int dhcp4_request_routes(Link *link) {
struct in_addr gw = {};
Route *rt;
int r;
assert(link);
if (!link->dhcp_lease)
return 0;
while ((rt = set_steal_first(link->dhcp_routes))) {
r = set_ensure_put(&link->dhcp_routes_old, &route_hash_ops, rt);
if (r < 0)
return log_link_error_errno(link, r, "Failed to store old DHCPv4 route: %m");
}
r = dhcp4_request_prefix_route(link);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not request prefix route: %m");
r = dhcp4_request_static_routes(link, &gw);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not request static routes: %m");
if (r == 0) {
/* 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. */
r = dhcp4_request_gateway(link, &gw);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not request gateway: %m");
}
r = dhcp4_request_routes_to_dns(link, &gw);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not request routes to DNS servers: %m");
r = dhcp4_request_routes_to_ntp(link, &gw);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not request routes to NTP servers: %m");
return 0;
}
static int dhcp_reset_mtu(Link *link) {
uint16_t mtu;
int r;
assert(link);
if (!link->network->dhcp_use_mtu)
return 0;
r = sd_dhcp_lease_get_mtu(link->dhcp_lease, &mtu);
if (r == -ENODATA)
return 0;
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: failed to get MTU from lease: %m");
if (link->original_mtu == mtu)
return 0;
r = link_request_to_set_mtu(link, link->original_mtu);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: could not reset MTU: %m");
return 0;
}
static int dhcp_reset_hostname(Link *link) {
const char *hostname;
int r;
assert(link);
if (!link->network->dhcp_use_hostname)
return 0;
hostname = link->network->dhcp_hostname;
if (!hostname)
(void) sd_dhcp_lease_get_hostname(link->dhcp_lease, &hostname);
if (!hostname)
return 0;
/* If a hostname was set due to the lease, then unset it now. */
r = manager_set_hostname(link->manager, NULL);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Failed to reset transient hostname: %m");
return 0;
}
static int dhcp4_remove_all(Link *link) {
Route *route;
int k, r = 0;
assert(link);
SET_FOREACH(route, link->dhcp_routes) {
k = route_remove(route, NULL, link);
if (k < 0)
r = k;
}
if (link->dhcp_address) {
k = address_remove(link->dhcp_address, link);
if (k < 0)
r = k;
}
return r;
}
int dhcp4_lease_lost(Link *link) {
int k, r = 0;
assert(link);
assert(link->dhcp_lease);
log_link_info(link, "DHCP lease lost");
link->dhcp4_configured = false;
/* dhcp4_lease_lost() may be called during renewing IP address. */
k = dhcp4_release_old_lease(link);
if (k < 0)
r = k;
k = dhcp4_remove_all(link);
if (k < 0)
r = k;
k = dhcp_reset_mtu(link);
if (k < 0)
r = k;
k = dhcp_reset_hostname(link);
if (k < 0)
r = k;
link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
link_dirty(link);
if (link->network->dhcp_send_decline) {
Address *a;
/* The acquired address may be still ARP probing and not configured. */
SET_FOREACH(a, link->addresses_ipv4acd)
if (!a->is_static && address_get(link, a, NULL) < 0) {
Request req = {
.link = link,
.address = a,
};
log_link_debug(link, "Canceling the request to configure DHCPv4 address "IPV4_ADDRESS_FMT_STR,
IPV4_ADDRESS_FMT_VAL(a->in_addr.in));
request_drop(ordered_set_get(link->manager->request_queue, &req));
}
}
if (r < 0)
return r;
r = link_request_static_nexthops(link, true);
if (r < 0)
return r;
return link_request_static_routes(link, true);
}
static int dhcp4_address_ready_callback(Address *address) {
assert(address);
/* Do not call this again. */
address->callback = NULL;
dhcp4_check_ready(address->link);
return 0;
}
static int dhcp4_after_address_configure(Request *req, void *object) {
Address *address = object;
Link *link;
int r;
assert(req);
assert(req->link);
assert(req->type == REQUEST_TYPE_ADDRESS);
assert(address);
link = req->link;
if (!address_equal(link->dhcp_address, address)) {
if (link->dhcp_address_old &&
!address_equal(link->dhcp_address_old, link->dhcp_address)) {
/* Still too old address exists? Let's remove it immediately. */
r = address_remove(link->dhcp_address_old, link);
if (r < 0)
return r;
}
link->dhcp_address_old = link->dhcp_address;
}
link->dhcp_address = address;
return 0;
}
static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
assert(link->dhcp4_messages > 0);
link->dhcp4_messages--;
r = address_configure_handler_internal(rtnl, m, link, "Could not set DHCPv4 address");
if (r <= 0)
return r;
if (address_is_ready(link->dhcp_address)) {
r = dhcp4_address_ready_callback(link->dhcp_address);
if (r < 0)
link_enter_failed(link);
} else
link->dhcp_address->callback = dhcp4_address_ready_callback;
return 1;
}
static int dhcp4_request_address(Link *link, bool announce) {
_cleanup_(address_freep) Address *addr = NULL;
uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
struct in_addr address, netmask;
unsigned prefixlen;
Request *req;
int r;
assert(link);
assert(link->network);
if (!link->dhcp_lease)
return 0;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: no address: %m");
r = sd_dhcp_lease_get_netmask(link->dhcp_lease, &netmask);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
r = sd_dhcp_lease_get_lifetime(link->dhcp_lease, &lifetime);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
}
prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
if (announce) {
const struct in_addr *router;
r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
if (r < 0 && r != -ENODATA)
return log_link_error_errno(link, r, "DHCP error: Could not get gateway: %m");
if (r > 0 && in4_addr_is_set(&router[0]))
log_struct(LOG_INFO,
LOG_LINK_INTERFACE(link),
LOG_LINK_MESSAGE(link, "DHCPv4 address "IPV4_ADDRESS_FMT_STR"/%u via "IPV4_ADDRESS_FMT_STR,
IPV4_ADDRESS_FMT_VAL(address),
prefixlen,
IPV4_ADDRESS_FMT_VAL(router[0])),
"ADDRESS="IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(address),
"PREFIXLEN=%u", prefixlen,
"GATEWAY="IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(router[0]));
else
log_struct(LOG_INFO,
LOG_LINK_INTERFACE(link),
LOG_LINK_MESSAGE(link, "DHCPv4 address "IPV4_ADDRESS_FMT_STR"/%u",
IPV4_ADDRESS_FMT_VAL(address),
prefixlen),
"ADDRESS="IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(address),
"PREFIXLEN=%u", prefixlen);
}
r = address_new(&addr);
if (r < 0)
return log_oom();
addr->family = AF_INET;
addr->in_addr.in.s_addr = address.s_addr;
addr->cinfo.ifa_prefered = lifetime;
addr->cinfo.ifa_valid = lifetime;
addr->prefixlen = prefixlen;
if (prefixlen <= 30)
addr->broadcast.s_addr = address.s_addr | ~netmask.s_addr;
SET_FLAG(addr->flags, IFA_F_NOPREFIXROUTE, !link_prefixroute(link));
addr->route_metric = link->network->dhcp_route_metric;
addr->duplicate_address_detection = link->network->dhcp_send_decline ? ADDRESS_FAMILY_IPV4 : ADDRESS_FAMILY_NO;
if (address_get(link, addr, NULL) < 0)
link->dhcp4_configured = false;
r = link_request_address(link, TAKE_PTR(addr), true, &link->dhcp4_messages,
dhcp4_address_handler, &req);
if (r < 0)
return log_link_error_errno(link, r, "Failed to request DHCPv4 address: %m");
if (r == 0)
return 0;
req->after_configure = dhcp4_after_address_configure;
return 0;
}
static int dhcp4_request_address_and_routes(Link *link, bool announce) {
int r;
assert(link);
r = dhcp4_request_address(link, announce);
if (r < 0)
return r;
r = dhcp4_request_routes(link);
if (r < 0)
return r;
link_set_state(link, LINK_STATE_CONFIGURING);
link_check_ready(link);
return 0;
}
static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
sd_dhcp_lease *lease;
int r;
assert(link);
assert(client);
r = sd_dhcp_client_get_lease(client, &lease);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: no lease: %m");
sd_dhcp_lease_unref(link->dhcp_lease);
link->dhcp_lease = sd_dhcp_lease_ref(lease);
link_dirty(link);
return dhcp4_request_address_and_routes(link, false);
}
static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
sd_dhcp_lease *lease;
int r;
assert(client);
assert(link);
r = sd_dhcp_client_get_lease(client, &lease);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: No lease: %m");
sd_dhcp_lease_unref(link->dhcp_lease);
link->dhcp_lease = sd_dhcp_lease_ref(lease);
link_dirty(link);
if (link->network->dhcp_use_mtu) {
uint16_t mtu;
r = sd_dhcp_lease_get_mtu(lease, &mtu);
if (r >= 0) {
r = link_request_to_set_mtu(link, mtu);
if (r < 0)
log_link_error_errno(link, r, "Failed to set MTU to %" PRIu16 ": %m", mtu);
}
}
if (link->network->dhcp_use_hostname) {
const char *dhcpname = NULL;
_cleanup_free_ char *hostname = NULL;
if (link->network->dhcp_hostname)
dhcpname = link->network->dhcp_hostname;
else
(void) sd_dhcp_lease_get_hostname(lease, &dhcpname);
if (dhcpname) {
r = shorten_overlong(dhcpname, &hostname);
if (r < 0)
log_link_warning_errno(link, r, "Unable to shorten overlong DHCP hostname '%s', ignoring: %m", dhcpname);
if (r == 1)
log_link_notice(link, "Overlong DHCP hostname received, shortened from '%s' to '%s'", dhcpname, hostname);
}
if (hostname) {
r = manager_set_hostname(link->manager, hostname);
if (r < 0)
log_link_error_errno(link, r, "Failed to set transient hostname to '%s': %m", hostname);
}
}
if (link->network->dhcp_use_timezone) {
const char *tz = NULL;
(void) sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
if (tz) {
r = manager_set_timezone(link->manager, tz);
if (r < 0)
log_link_error_errno(link, r, "Failed to set timezone to '%s': %m", tz);
}
}
return dhcp4_request_address_and_routes(link, true);
}
static int dhcp_lease_ip_change(sd_dhcp_client *client, Link *link) {
int r;
r = dhcp_lease_acquired(client, link);
if (r < 0)
(void) dhcp4_lease_lost(link);
return r;
}
static int dhcp_server_is_deny_listed(Link *link, sd_dhcp_client *client) {
sd_dhcp_lease *lease;
struct in_addr addr;
int r;
assert(link);
assert(link->network);
assert(client);
r = sd_dhcp_client_get_lease(client, &lease);
if (r < 0)
return log_link_error_errno(link, r, "Failed to get DHCP lease: %m");
r = sd_dhcp_lease_get_server_identifier(lease, &addr);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to get DHCP server IP address: %m");
if (set_contains(link->network->dhcp_deny_listed_ip, UINT32_TO_PTR(addr.s_addr))) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_LINK_MESSAGE(link, "DHCPv4 server IP address "IPV4_ADDRESS_FMT_STR" found in deny-list, ignoring offer",
IPV4_ADDRESS_FMT_VAL(addr)));
return true;
}
return false;
}
static int dhcp_server_is_allow_listed(Link *link, sd_dhcp_client *client) {
sd_dhcp_lease *lease;
struct in_addr addr;
int r;
assert(link);
assert(link->network);
assert(client);
r = sd_dhcp_client_get_lease(client, &lease);
if (r < 0)
return log_link_error_errno(link, r, "Failed to get DHCP lease: %m");
r = sd_dhcp_lease_get_server_identifier(lease, &addr);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to get DHCP server IP address: %m");
if (set_contains(link->network->dhcp_allow_listed_ip, UINT32_TO_PTR(addr.s_addr))) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_LINK_MESSAGE(link, "DHCPv4 server IP address "IPV4_ADDRESS_FMT_STR" found in allow-list, accepting offer",
IPV4_ADDRESS_FMT_VAL(addr)));
return true;
}
return false;
}
static int dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
Link *link = userdata;
int r;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 0;
switch (event) {
case SD_DHCP_CLIENT_EVENT_STOP:
if (link->ipv4ll) {
log_link_debug(link, "DHCP client is stopped. Acquiring IPv4 link-local address");
r = sd_ipv4ll_start(link->ipv4ll);
if (r < 0)
return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
}
if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
return 0;
}
if (link->dhcp_lease) {
if (link->network->dhcp_send_release) {
r = sd_dhcp_client_send_release(client);
if (r < 0)
log_link_full_errno(link,
ERRNO_IS_DISCONNECT(r) ? LOG_DEBUG : LOG_WARNING,
r, "Failed to send DHCP RELEASE, ignoring: %m");
}
r = dhcp4_lease_lost(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
break;
case SD_DHCP_CLIENT_EVENT_EXPIRED:
if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
return 0;
}
if (link->dhcp_lease) {
r = dhcp4_lease_lost(link);
if (r < 0) {
link_enter_failed(link);
return r;
}
}
break;
case SD_DHCP_CLIENT_EVENT_IP_CHANGE:
if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
log_link_notice(link, "DHCPv4 connection considered critical, ignoring request to reconfigure it.");
return 0;
}
r = dhcp_lease_ip_change(client, link);
if (r < 0) {
link_enter_failed(link);
return r;
}
break;
case SD_DHCP_CLIENT_EVENT_RENEW:
r = dhcp_lease_renew(client, link);
if (r < 0) {
link_enter_failed(link);
return r;
}
break;
case SD_DHCP_CLIENT_EVENT_IP_ACQUIRE:
r = dhcp_lease_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return r;
}
break;
case SD_DHCP_CLIENT_EVENT_SELECTING:
if (!set_isempty(link->network->dhcp_allow_listed_ip)) {
r = dhcp_server_is_allow_listed(link, client);
if (r < 0)
return r;
if (r == 0)
return -ENOMSG;
} else {
r = dhcp_server_is_deny_listed(link, client);
if (r < 0)
return r;
if (r != 0)
return -ENOMSG;
}
break;
case SD_DHCP_CLIENT_EVENT_TRANSIENT_FAILURE:
if (link->ipv4ll && !sd_ipv4ll_is_running(link->ipv4ll)) {
log_link_debug(link, "Problems acquiring DHCP lease, acquiring IPv4 link-local address");
r = sd_ipv4ll_start(link->ipv4ll);
if (r < 0)
return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
}
break;
default:
if (event < 0)
log_link_warning_errno(link, event, "DHCP error: Client failed: %m");
else
log_link_warning(link, "DHCP unknown event: %i", event);
break;
}
return 0;
}
static int dhcp4_set_hostname(Link *link) {
_cleanup_free_ char *hostname = NULL;
const char *hn;
int r;
assert(link);
if (!link->network->dhcp_send_hostname)
hn = NULL;
else if (link->network->dhcp_hostname)
hn = link->network->dhcp_hostname;
else {
r = gethostname_strict(&hostname);
if (r < 0 && r != -ENXIO) /* ENXIO: no hostname set or hostname is "localhost" */
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to get hostname: %m");
hn = hostname;
}
r = sd_dhcp_client_set_hostname(link->dhcp_client, hn);
if (r == -EINVAL && hostname)
/* Ignore error when the machine's hostname is not suitable to send in DHCP packet. */
log_link_debug_errno(link, r, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
else if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m");
return 0;
}
static int dhcp4_set_client_identifier(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->dhcp_client);
switch (link->network->dhcp_client_identifier) {
case DHCP_CLIENT_ID_DUID: {
/* If configured, apply user specified DUID and IAID */
const DUID *duid = link_get_dhcp4_duid(link);
if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client,
link->network->dhcp_iaid_set,
link->network->dhcp_iaid,
duid->llt_time);
else
r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
link->network->dhcp_iaid_set,
link->network->dhcp_iaid,
duid->type,
duid->raw_data_len > 0 ? duid->raw_data : NULL,
duid->raw_data_len);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set IAID+DUID: %m");
break;
}
case DHCP_CLIENT_ID_DUID_ONLY: {
/* If configured, apply user specified DUID */
const DUID *duid = link_get_dhcp4_duid(link);
if (duid->type == DUID_TYPE_LLT && duid->raw_data_len == 0)
r = sd_dhcp_client_set_duid_llt(link->dhcp_client,
duid->llt_time);
else
r = sd_dhcp_client_set_duid(link->dhcp_client,
duid->type,
duid->raw_data_len > 0 ? duid->raw_data : NULL,
duid->raw_data_len);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
break;
}
case DHCP_CLIENT_ID_MAC: {
const uint8_t *hw_addr = link->hw_addr.bytes;
size_t hw_addr_len = link->hw_addr.length;
if (link->iftype == ARPHRD_INFINIBAND && hw_addr_len == INFINIBAND_ALEN) {
/* set_client_id expects only last 8 bytes of an IB address */
hw_addr += INFINIBAND_ALEN - 8;
hw_addr_len -= INFINIBAND_ALEN - 8;
}
r = sd_dhcp_client_set_client_id(link->dhcp_client,
link->iftype,
hw_addr,
hw_addr_len);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m");
break;
}
default:
assert_not_reached("Unknown client identifier type.");
}
return 0;
}
static int dhcp4_configure_duid(Link *link) {
assert(link);
if (!IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
return 1;
return dhcp_configure_duid(link, link_get_dhcp4_duid(link));
}
static int dhcp4_set_request_address(Link *link) {
Address *a;
assert(link);
assert(link->network);
assert(link->dhcp_client);
if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
return 0;
SET_FOREACH(a, link->addresses_foreign) {
if (a->family != AF_INET)
continue;
if (link_address_is_dynamic(link, a))
break;
}
if (!a)
return 0;
log_link_debug(link, "DHCP4 CLIENT: requesting " IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(a->in_addr.in));
return sd_dhcp_client_set_request_address(link->dhcp_client, &a->in_addr.in);
}
static bool link_needs_dhcp_broadcast(Link *link) {
const char *val;
int r;
assert(link);
assert(link->network);
/* Return the setting in DHCP[4].RequestBroadcast if specified. Otherwise return the device property
* ID_NET_DHCP_BROADCAST setting, which may be set for interfaces requiring that the DHCPOFFER message
* is being broadcast because they can't handle unicast messages while not fully configured.
* If neither is set or a failure occurs, return false, which is the default for this flag.
*/
r = link->network->dhcp_broadcast;
if (r < 0 && link->sd_device && sd_device_get_property_value(link->sd_device, "ID_NET_DHCP_BROADCAST", &val) >= 0) {
r = parse_boolean(val);
if (r < 0)
log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to parse ID_NET_DHCP_BROADCAST, ignoring: %m");
else
log_link_debug(link, "DHCP4 CLIENT: Detected ID_NET_DHCP_BROADCAST='%d'.", r);
}
return r == true;
}
int dhcp4_configure(Link *link) {
sd_dhcp_option *send_option;
void *request_options;
int r;
assert(link);
assert(link->network);
if (!link_dhcp4_enabled(link))
return 0;
if (link->dhcp_client)
return -EBUSY; /* Already configured. */
r = dhcp4_configure_duid(link);
if (r <= 0)
return r;
r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to allocate DHCP4 client: %m");
r = sd_dhcp_client_attach_event(link->dhcp_client, link->manager->event, 0);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to attach event to DHCP4 client: %m");
r = sd_dhcp_client_set_mac(link->dhcp_client,
link->hw_addr.bytes,
link->bcast_addr.length > 0 ? link->bcast_addr.bytes : NULL,
link->hw_addr.length, link->iftype);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set MAC address: %m");
r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set ifindex: %m");
r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m");
r = sd_dhcp_client_set_request_broadcast(link->dhcp_client, link_needs_dhcp_broadcast(link));
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
if (link->mtu > 0) {
r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m");
}
if (!link->network->dhcp_anonymize) {
if (link->network->dhcp_use_mtu) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_INTERFACE_MTU);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
}
if (link->network->dhcp_use_routes) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_STATIC_ROUTE);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for static route: %m");
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for classless static route: %m");
}
if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_DOMAIN_SEARCH_LIST);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for domain search list: %m");
}
if (link->network->dhcp_use_ntp) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NTP_SERVER);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for NTP server: %m");
}
if (link->network->dhcp_use_sip) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_SIP_SERVER);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for SIP server: %m");
}
if (link->network->dhcp_use_timezone) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_NEW_TZDB_TIMEZONE);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
}
SET_FOREACH(request_options, link->network->dhcp_request_options) {
uint32_t option = PTR_TO_UINT32(request_options);
r = sd_dhcp_client_set_request_option(link->dhcp_client, option);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for '%u': %m", option);
}
ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp_client_send_options) {
r = sd_dhcp_client_add_option(link->dhcp_client, send_option);
if (r == -EEXIST)
continue;
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set send option: %m");
}
ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp_client_send_vendor_options) {
r = sd_dhcp_client_add_vendor_option(link->dhcp_client, send_option);
if (r == -EEXIST)
continue;
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set send option: %m");
}
r = dhcp4_set_hostname(link);
if (r < 0)
return r;
if (link->network->dhcp_vendor_class_identifier) {
r = sd_dhcp_client_set_vendor_class_identifier(link->dhcp_client,
link->network->dhcp_vendor_class_identifier);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set vendor class identifier: %m");
}
if (link->network->dhcp_mudurl) {
r = sd_dhcp_client_set_mud_url(link->dhcp_client, link->network->dhcp_mudurl);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set MUD URL: %m");
}
if (link->network->dhcp_user_class) {
r = sd_dhcp_client_set_user_class(link->dhcp_client, link->network->dhcp_user_class);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m");
}
}
if (link->network->dhcp_client_port > 0) {
r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set listen port: %m");
}
if (link->network->dhcp_max_attempts > 0) {
r = sd_dhcp_client_set_max_attempts(link->dhcp_client, link->network->dhcp_max_attempts);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set max attempts: %m");
}
if (link->network->dhcp_ip_service_type > 0) {
r = sd_dhcp_client_set_service_type(link->dhcp_client, link->network->dhcp_ip_service_type);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set IP service type: %m");
}
if (link->network->dhcp_fallback_lease_lifetime > 0) {
r = sd_dhcp_client_set_fallback_lease_lifetime(link->dhcp_client, link->network->dhcp_fallback_lease_lifetime);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed set to lease lifetime: %m");
}
r = dhcp4_set_request_address(link);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP4 CLIENT: Failed to set initial DHCPv4 address: %m");
return dhcp4_set_client_identifier(link);
}
int dhcp4_update_mac(Link *link) {
int r;
assert(link);
if (!link->dhcp_client)
return 0;
r = sd_dhcp_client_set_mac(link->dhcp_client, link->hw_addr.bytes,
link->bcast_addr.length > 0 ? link->bcast_addr.bytes : NULL,
link->hw_addr.length, link->iftype);
if (r < 0)
return r;
return dhcp4_set_client_identifier(link);
}
int dhcp4_start(Link *link) {
assert(link);
if (!link->dhcp_client)
return 0;
if (sd_dhcp_client_is_running(link->dhcp_client) > 0)
return 0;
log_link_debug(link, "Acquiring DHCPv4 lease");
return sd_dhcp_client_start(link->dhcp_client);
}
int config_parse_dhcp_max_attempts(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = data;
uint64_t a;
int r;
assert(network);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
network->dhcp_max_attempts = 0;
return 0;
}
if (streq(rvalue, "infinity")) {
network->dhcp_max_attempts = UINT64_MAX;
return 0;
}
r = safe_atou64(rvalue, &a);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse DHCP maximum attempts, ignoring: %s", rvalue);
return 0;
}
if (a == 0) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"%s= must be positive integer or 'infinity', ignoring: %s", lvalue, rvalue);
return 0;
}
network->dhcp_max_attempts = a;
return 0;
}
int config_parse_dhcp_acl_ip_address(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = data;
Set **acl;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
acl = STR_IN_SET(lvalue, "DenyList", "BlackList") ? &network->dhcp_deny_listed_ip : &network->dhcp_allow_listed_ip;
if (isempty(rvalue)) {
*acl = set_free(*acl);
return 0;
}
for (const char *p = rvalue;;) {
_cleanup_free_ char *n = NULL;
union in_addr_union ip;
r = extract_first_word(&p, &n, NULL, 0);
if (r == -ENOMEM)
return log_oom();
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse DHCP '%s=' IP address, ignoring assignment: %s",
lvalue, rvalue);
return 0;
}
if (r == 0)
return 0;
r = in_addr_from_string(AF_INET, n, &ip);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"DHCP '%s=' IP address is invalid, ignoring assignment: %s", lvalue, n);
continue;
}
r = set_ensure_put(acl, NULL, UINT32_TO_PTR(ip.in.s_addr));
if (r < 0)
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to store DHCP '%s=' IP address '%s', ignoring assignment: %m", lvalue, n);
}
}
int config_parse_dhcp_ip_service_type(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
assert(filename);
assert(lvalue);
assert(rvalue);
if (streq(rvalue, "CS4"))
*((int *)data) = IPTOS_CLASS_CS4;
else if (streq(rvalue, "CS6"))
*((int *)data) = IPTOS_CLASS_CS6;
else
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Failed to parse IPServiceType type '%s', ignoring.", rvalue);
return 0;
}
int config_parse_dhcp_mud_url(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
_cleanup_free_ char *unescaped = NULL;
Network *network = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
network->dhcp_mudurl = mfree(network->dhcp_mudurl);
return 0;
}
r = cunescape(rvalue, 0, &unescaped);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to Failed to unescape MUD URL, ignoring: %s", rvalue);
return 0;
}
if (!http_url_is_valid(unescaped) || strlen(unescaped) > 255) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Failed to parse MUD URL '%s', ignoring: %m", rvalue);
return 0;
}
return free_and_strdup_warn(&network->dhcp_mudurl, unescaped);
}
int config_parse_dhcp_fallback_lease_lifetime(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
uint32_t k;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
if (isempty(rvalue)) {
network->dhcp_fallback_lease_lifetime = 0;
return 0;
}
/* We accept only "forever" or "infinity". */
if (STR_IN_SET(rvalue, "forever", "infinity"))
k = CACHE_INFO_INFINITY_LIFE_TIME;
else {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid LeaseLifetime= value, ignoring: %s", rvalue);
return 0;
}
network->dhcp_fallback_lease_lifetime = k;
return 0;
}
static const char* const dhcp_client_identifier_table[_DHCP_CLIENT_ID_MAX] = {
[DHCP_CLIENT_ID_MAC] = "mac",
[DHCP_CLIENT_ID_DUID] = "duid",
[DHCP_CLIENT_ID_DUID_ONLY] = "duid-only",
};
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(dhcp_client_identifier, DHCPClientIdentifier);
DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_client_identifier, dhcp_client_identifier, DHCPClientIdentifier,
"Failed to parse client identifier type");