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systemd/src/network/networkd-dhcp4.c
T
Ronan Pigott 808b65a087 network: implement RFC4039 DHCP Rapid Commit 
This implements the DHCPv4 equivalent of the DHCPv6 Rapid Commit option,
enabling a lease to be selected in an accelerated 2-message exchange
instead of the typical 4-message exchange.
2023-10-26 15:26:50 -07:00

2017 lines
72 KiB
C
Raw Blame History

/* 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 "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-dhcp-prefix-delegation.h"
#include "networkd-dhcp4-bus.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"
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_prefix_covers(
Link *link,
const struct in_addr *in_prefix,
uint8_t in_prefixlen) {
struct in_addr prefix;
uint8_t prefixlen;
int r;
assert(link);
assert(link->dhcp_lease);
assert(in_prefix);
/* Return true if the input address or address range is in the assigned network.
* E.g. if the DHCP server provides 192.168.0.100/24, then this returns true for the address or
* address range in 192.168.0.0/24, and returns false otherwise. */
r = sd_dhcp_lease_get_prefix(link->dhcp_lease, &prefix, &prefixlen);
if (r < 0)
return r;
return in4_addr_prefix_covers_full(&prefix, prefixlen, in_prefix, in_prefixlen);
}
static int dhcp4_get_router(Link *link, struct in_addr *ret) {
const struct in_addr *routers;
int r;
assert(link);
assert(link->dhcp_lease);
assert(ret);
r = sd_dhcp_lease_get_router(link->dhcp_lease, &routers);
if (r < 0)
return r;
/* The router option may provide multiple routers, We only use the first non-null address. */
FOREACH_ARRAY(router, routers, r) {
if (in4_addr_is_null(router))
continue;
*ret = *router;
return 0;
}
return -ENODATA;
}
static int dhcp4_get_classless_static_or_static_routes(Link *link, sd_dhcp_route ***ret_routes, size_t *ret_num) {
_cleanup_free_ sd_dhcp_route **routes = NULL;
int r;
assert(link);
assert(link->dhcp_lease);
/* 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. */
r = sd_dhcp_lease_get_classless_routes(link->dhcp_lease, &routes);
if (r >= 0) {
assert(r > 0);
if (ret_routes)
*ret_routes = TAKE_PTR(routes);
if (ret_num)
*ret_num = r;
return 1; /* classless */
} else if (r != -ENODATA)
return r;
r = sd_dhcp_lease_get_static_routes(link->dhcp_lease, &routes);
if (r < 0)
return r;
assert(r > 0);
if (ret_routes)
*ret_routes = TAKE_PTR(routes);
if (ret_num)
*ret_num = r;
return 0; /* static */
}
static int dhcp4_find_gateway_for_destination(
Link *link,
const struct in_addr *destination,
uint8_t prefixlength,
bool allow_null,
struct in_addr *ret) {
_cleanup_free_ sd_dhcp_route **routes = NULL;
size_t n_routes = 0;
bool is_classless, reachable;
uint8_t max_prefixlen = UINT8_MAX;
struct in_addr gw;
int r;
assert(link);
assert(link->dhcp_lease);
assert(destination);
assert(ret);
/* This tries to find the most suitable gateway for an address or address range.
* E.g. if the server provides the default gateway 192.168.0.1 and a classless static route for
* 8.0.0.0/8 with gateway 192.168.0.2, then this returns 192.168.0.2 for 8.8.8.8/32, and 192.168.0.1
* for 9.9.9.9/32. If 'allow_null' flag is set, and the input address or address range is in the
* assigned network, then the default gateway will be ignored and the null address will be returned
* unless a matching non-default gateway found. */
r = dhcp4_prefix_covers(link, destination, prefixlength);
if (r < 0)
return r;
reachable = r > 0;
r = dhcp4_get_classless_static_or_static_routes(link, &routes, &n_routes);
if (r < 0 && r != -ENODATA)
return r;
is_classless = r > 0;
/* First, find most suitable gateway. */
FOREACH_ARRAY(e, routes, n_routes) {
struct in_addr dst;
uint8_t len;
r = sd_dhcp_route_get_destination(*e, &dst);
if (r < 0)
return r;
r = sd_dhcp_route_get_destination_prefix_length(*e, &len);
if (r < 0)
return r;
r = in4_addr_prefix_covers_full(&dst, len, destination, prefixlength);
if (r < 0)
return r;
if (r == 0)
continue;
if (max_prefixlen != UINT8_MAX && max_prefixlen > len)
continue;
r = sd_dhcp_route_get_gateway(*e, &gw);
if (r < 0)
return r;
max_prefixlen = len;
}
/* Found a suitable gateway in classless static routes or static routes. */
if (max_prefixlen != UINT8_MAX) {
if (max_prefixlen == 0 && reachable && allow_null)
/* Do not return the default gateway, if the destination is in the assigned network. */
*ret = (struct in_addr) {};
else
*ret = gw;
return 0;
}
/* When the destination is in the assigned network, return the null address if allowed. */
if (reachable && allow_null) {
*ret = (struct in_addr) {};
return 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. */
if (!is_classless) {
r = dhcp4_get_router(link, ret);
if (r >= 0)
return 0;
if (r != -ENODATA)
return r;
}
if (!reachable)
return -EHOSTUNREACH; /* Not in the same network, cannot reach the destination. */
assert(!allow_null);
return -ENODATA; /* No matching gateway found. */
}
static int dhcp4_remove_address_and_routes(Link *link, bool only_marked) {
Address *address;
Route *route;
int k, r = 0;
assert(link);
SET_FOREACH(route, link->routes) {
if (route->source != NETWORK_CONFIG_SOURCE_DHCP4)
continue;
if (only_marked && !route_is_marked(route))
continue;
k = route_remove(route);
if (k < 0)
r = k;
route_cancel_request(route, link);
}
SET_FOREACH(address, link->addresses) {
if (address->source != NETWORK_CONFIG_SOURCE_DHCP4)
continue;
if (only_marked && !address_is_marked(address))
continue;
k = address_remove_and_drop(address);
if (k < 0)
r = k;
}
return r;
}
static int dhcp4_address_get(Link *link, Address **ret) {
Address *address;
assert(link);
SET_FOREACH(address, link->addresses) {
if (address->source != NETWORK_CONFIG_SOURCE_DHCP4)
continue;
if (address_is_marked(address))
continue;
if (ret)
*ret = address;
return 0;
}
return -ENOENT;
}
static int dhcp4_address_ready_callback(Address *address) {
assert(address);
assert(address->link);
/* Do not call this again. */
address->callback = NULL;
return dhcp4_check_ready(address->link);
}
int dhcp4_check_ready(Link *link) {
Address *address;
int r;
assert(link);
if (link->dhcp4_messages > 0) {
log_link_debug(link, "%s(): DHCPv4 address and routes are not set.", __func__);
return 0;
}
if (dhcp4_address_get(link, &address) < 0) {
log_link_debug(link, "%s(): DHCPv4 address is not set.", __func__);
return 0;
}
if (!address_is_ready(address)) {
log_link_debug(link, "%s(): DHCPv4 address is not ready.", __func__);
address->callback = dhcp4_address_ready_callback;
return 0;
}
link->dhcp4_configured = true;
log_link_debug(link, "DHCPv4 address and routes set.");
/* New address and routes are configured now. Let's release old lease. */
r = dhcp4_remove_address_and_routes(link, /* only_marked = */ true);
if (r < 0)
return r;
r = sd_ipv4ll_stop(link->ipv4ll);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to drop IPv4 link-local address: %m");
link_check_ready(link);
return 0;
}
static int dhcp4_route_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Route *route) {
int r;
assert(m);
assert(link);
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "Could not set DHCPv4 route");
link_enter_failed(link);
return 1;
}
r = dhcp4_check_ready(link);
if (r < 0)
link_enter_failed(link);
return 1;
}
static int dhcp4_request_route(Route *in, Link *link) {
_cleanup_(route_freep) Route *route = in;
struct in_addr server;
Route *existing;
int r;
assert(route);
assert(link);
assert(link->network);
assert(link->dhcp_lease);
r = sd_dhcp_lease_get_server_identifier(link->dhcp_lease, &server);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to get DHCP server IP address: %m");
route->source = NETWORK_CONFIG_SOURCE_DHCP4;
route->provider.in = server;
route->family = AF_INET;
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_dhcp4_route_table(link);
if (route->mtu == 0)
route->mtu = link->network->dhcp_route_mtu;
if (route->quickack < 0)
route->quickack = link->network->dhcp_quickack;
if (route->initcwnd == 0)
route->initcwnd = link->network->dhcp_initial_congestion_window;
if (route->initrwnd == 0)
route->initrwnd = link->network->dhcp_advertised_receive_window;
if (route_get(NULL, link, route, &existing) < 0) /* This is a new route. */
link->dhcp4_configured = false;
else
route_unmark(existing);
return link_request_route(link, TAKE_PTR(route), true, &link->dhcp4_messages,
dhcp4_route_handler, NULL);
}
static bool link_prefixroute(Link *link) {
return !link->network->dhcp_route_table_set ||
link->network->dhcp_route_table == RT_TABLE_MAIN;
}
static int dhcp4_request_prefix_route(Link *link) {
_cleanup_(route_freep) Route *route = NULL;
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 = route_new(&route);
if (r < 0)
return r;
route->scope = RT_SCOPE_LINK;
r = sd_dhcp_lease_get_prefix(link->dhcp_lease, &route->dst.in, &route->dst_prefixlen);
if (r < 0)
return r;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &route->prefsrc.in);
if (r < 0)
return r;
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->dst.in = *gw;
route->dst_prefixlen = 32;
route->prefsrc.in = address;
route->scope = RT_SCOPE_LINK;
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;
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;
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 (in4_addr_is_null(gw)) {
r = dhcp4_prefix_covers(link, &route->dst.in, route->dst_prefixlen);
if (r < 0)
return r;
if (r == 0 && DEBUG_LOGGING) {
struct in_addr prefix;
uint8_t prefixlen;
r = sd_dhcp_lease_get_prefix(link->dhcp_lease, &prefix, &prefixlen);
if (r < 0)
return r;
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, using 'link' scope.",
IPV4_ADDRESS_FMT_VAL(route->dst.in), route->dst_prefixlen,
IPV4_ADDRESS_FMT_VAL(prefix), prefixlen);
}
route->scope = RT_SCOPE_LINK;
route->gw_family = AF_UNSPEC;
route->gw = IN_ADDR_NULL;
route->prefsrc.in = address;
} else {
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_classless_static_or_static_routes(Link *link) {
_cleanup_free_ sd_dhcp_route **routes = NULL;
size_t n_routes;
int r;
assert(link);
assert(link->dhcp_lease);
if (!link->network->dhcp_use_routes)
return 0;
r = dhcp4_get_classless_static_or_static_routes(link, &routes, &n_routes);
if (r == -ENODATA)
return 0;
if (r < 0)
return r;
FOREACH_ARRAY(e, routes, n_routes) {
_cleanup_(route_freep) Route *route = NULL;
struct in_addr gw;
r = route_new(&route);
if (r < 0)
return r;
r = sd_dhcp_route_get_gateway(*e, &gw);
if (r < 0)
return r;
r = sd_dhcp_route_get_destination(*e, &route->dst.in);
if (r < 0)
return r;
r = sd_dhcp_route_get_destination_prefix_length(*e, &route->dst_prefixlen);
if (r < 0)
return r;
r = dhcp4_request_route_auto(TAKE_PTR(route), link, &gw);
if (r < 0)
return r;
}
return 0;
}
static int dhcp4_request_default_gateway(Link *link) {
_cleanup_(route_freep) Route *route = NULL;
struct in_addr address, router;
int r;
assert(link);
assert(link->dhcp_lease);
if (!link->network->dhcp_use_gateway)
return 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. */
if (link->network->dhcp_use_routes &&
dhcp4_get_classless_static_or_static_routes(link, NULL, NULL) > 0)
return 0;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return r;
r = dhcp4_get_router(link, &router);
if (r == -ENODATA) {
log_link_debug(link, "DHCP: No valid router address received from DHCP server.");
return 0;
}
if (r < 0)
return r;
/* 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);
if (r < 0)
return r;
r = route_new(&route);
if (r < 0)
return r;
/* Next, add a default gateway. */
route->gw_family = AF_INET;
route->gw.in = router;
route->prefsrc.in = address;
return dhcp4_request_route(TAKE_PTR(route), link);
}
static int dhcp4_request_semi_static_routes(Link *link) {
Route *rt;
int r;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
HASHMAP_FOREACH(rt, link->network->routes_by_section) {
_cleanup_(route_freep) Route *route = NULL;
struct in_addr gw;
if (!rt->gateway_from_dhcp_or_ra)
continue;
if (rt->gw_family != AF_INET)
continue;
assert(rt->family == AF_INET);
r = dhcp4_find_gateway_for_destination(link, &rt->dst.in, rt->dst_prefixlen, /* allow_null = */ false, &gw);
if (IN_SET(r, -EHOSTUNREACH, -ENODATA)) {
log_link_debug_errno(link, r, "DHCP: Cannot find suitable gateway for destination %s of semi-static route, ignoring: %m",
IN4_ADDR_PREFIX_TO_STRING(&rt->dst.in, rt->dst_prefixlen));
continue;
}
if (r < 0)
return r;
r = dhcp4_request_route_to_gateway(link, &gw);
if (r < 0)
return r;
r = route_dup(rt, &route);
if (r < 0)
return r;
route->gw.in = gw;
r = dhcp4_request_route(TAKE_PTR(route), link);
if (r < 0)
return r;
}
return 0;
}
static int dhcp4_request_routes_to_servers(
Link *link,
const struct in_addr *servers,
size_t n_servers) {
int r;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
assert(servers || n_servers == 0);
FOREACH_ARRAY(dst, servers, n_servers) {
_cleanup_(route_freep) Route *route = NULL;
struct in_addr gw;
if (in4_addr_is_null(dst))
continue;
r = dhcp4_find_gateway_for_destination(link, dst, 32, /* allow_null = */ true, &gw);
if (r == -EHOSTUNREACH) {
log_link_debug_errno(link, r, "DHCP: Cannot find suitable gateway for destination %s, ignoring: %m",
IN4_ADDR_PREFIX_TO_STRING(dst, 32));
continue;
}
if (r < 0)
return r;
r = route_new(&route);
if (r < 0)
return r;
route->dst.in = *dst;
route->dst_prefixlen = 32;
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 *dns;
int r;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
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);
}
static int dhcp4_request_routes_to_ntp(Link *link) {
const struct in_addr *ntp;
int r;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
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);
}
static int dhcp4_request_routes(Link *link) {
int r;
assert(link);
assert(link->dhcp_lease);
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_default_gateway(link);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not request default gateway: %m");
r = dhcp4_request_classless_static_or_static_routes(link);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not request static routes: %m");
r = dhcp4_request_semi_static_routes(link);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not request routes with Gateway=_dhcp4 setting: %m");
r = dhcp4_request_routes_to_dns(link);
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);
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) {
int r;
assert(link);
if (!link->network->dhcp_use_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 queue request to 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;
}
int dhcp4_lease_lost(Link *link) {
int k, r = 0;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
log_link_info(link, "DHCP lease lost");
link->dhcp4_configured = false;
if (link->network->dhcp_use_6rd &&
sd_dhcp_lease_has_6rd(link->dhcp_lease))
dhcp4_pd_prefix_lost(link);
k = dhcp4_remove_address_and_routes(link, /* only_marked = */ false);
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 one of the above failed. Do not request nexthops and routes. */
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_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, Address *address) {
int r;
assert(link);
r = address_configure_handler_internal(rtnl, m, link, "Could not set DHCPv4 address");
if (r <= 0)
return r;
r = dhcp4_check_ready(link);
if (r < 0)
link_enter_failed(link);
return 1;
}
static int dhcp4_request_address(Link *link, bool announce) {
_cleanup_(address_freep) Address *addr = NULL;
struct in_addr address, server;
uint8_t prefixlen;
Address *existing;
usec_t lifetime_usec;
int r;
assert(link);
assert(link->manager);
assert(link->network);
assert(link->dhcp_lease);
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_prefix(link->dhcp_lease, NULL, &prefixlen);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: no netmask: %m");
r = sd_dhcp_lease_get_server_identifier(link->dhcp_lease, &server);
if (r < 0)
return log_link_debug_errno(link, r, "DHCP error: failed to get DHCP server IP address: %m");
if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
r = sd_dhcp_lease_get_lifetime_timestamp(link->dhcp_lease, CLOCK_BOOTTIME, &lifetime_usec);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: failed to get lifetime: %m");
} else
lifetime_usec = USEC_INFINITY;
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, gateway "IPV4_ADDRESS_FMT_STR" acquired from "IPV4_ADDRESS_FMT_STR,
IPV4_ADDRESS_FMT_VAL(address),
prefixlen,
IPV4_ADDRESS_FMT_VAL(router[0]),
IPV4_ADDRESS_FMT_VAL(server)),
"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 acquired from "IPV4_ADDRESS_FMT_STR,
IPV4_ADDRESS_FMT_VAL(address),
prefixlen,
IPV4_ADDRESS_FMT_VAL(server)),
"ADDRESS="IPV4_ADDRESS_FMT_STR, IPV4_ADDRESS_FMT_VAL(address),
"PREFIXLEN=%u", prefixlen);
}
r = address_new(&addr);
if (r < 0)
return log_oom();
addr->source = NETWORK_CONFIG_SOURCE_DHCP4;
addr->provider.in = server;
addr->family = AF_INET;
addr->in_addr.in.s_addr = address.s_addr;
addr->lifetime_preferred_usec = lifetime_usec;
addr->lifetime_valid_usec = lifetime_usec;
addr->prefixlen = prefixlen;
r = sd_dhcp_lease_get_broadcast(link->dhcp_lease, &addr->broadcast);
if (r < 0 && r != -ENODATA)
return log_link_warning_errno(link, r, "DHCP: failed to get broadcast address: %m");
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;
r = free_and_strdup_warn(&addr->label, link->network->dhcp_label);
if (r < 0)
return r;
r = free_and_strdup_warn(&addr->netlabel, link->network->dhcp_netlabel);
if (r < 0)
return r;
if (address_get(link, addr, &existing) < 0) /* The address is new. */
link->dhcp4_configured = false;
else
address_unmark(existing);
r = link_request_address(link, addr, &link->dhcp4_messages,
dhcp4_address_handler, NULL);
if (r < 0)
return log_link_error_errno(link, r, "Failed to request DHCPv4 address: %m");
return 0;
}
static int dhcp4_request_address_and_routes(Link *link, bool announce) {
int r;
assert(link);
link_mark_addresses(link, NETWORK_CONFIG_SOURCE_DHCP4);
link_mark_routes(link, NETWORK_CONFIG_SOURCE_DHCP4);
r = dhcp4_request_address(link, announce);
if (r < 0)
return r;
r = dhcp4_request_routes(link);
if (r < 0)
return r;
if (!link->dhcp4_configured) {
link_set_state(link, LINK_STATE_CONFIGURING);
link_check_ready(link);
}
return 0;
}
static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
_cleanup_(sd_dhcp_lease_unrefp) sd_dhcp_lease *old_lease = NULL;
sd_dhcp_lease *lease;
int r;
assert(link);
assert(link->network);
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");
old_lease = TAKE_PTR(link->dhcp_lease);
link->dhcp_lease = sd_dhcp_lease_ref(lease);
link_dirty(link);
if (link->network->dhcp_use_6rd) {
if (sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
r = dhcp4_pd_prefix_acquired(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to process 6rd option: %m");
} else if (sd_dhcp_lease_has_6rd(old_lease))
dhcp4_pd_prefix_lost(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);
}
}
if (link->network->dhcp_use_6rd &&
sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
r = dhcp4_pd_prefix_acquired(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to process 6rd option: %m");
}
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_filtered(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 (in4_address_is_filtered(&addr, link->network->dhcp_allow_listed_ip, link->network->dhcp_deny_listed_ip)) {
if (DEBUG_LOGGING) {
if (link->network->dhcp_allow_listed_ip)
log_link_debug(link, "DHCPv4 server IP address "IPV4_ADDRESS_FMT_STR" not found in allow-list, ignoring offer.",
IPV4_ADDRESS_FMT_VAL(addr));
else
log_link_debug(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 dhcp4_handler(sd_dhcp_client *client, int event, void *userdata) {
Link *link = ASSERT_PTR(userdata);
int r;
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");
if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
}
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:
r = dhcp_server_is_filtered(link, client);
if (r < 0) {
link_enter_failed(link);
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");
if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
if (r < 0)
return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
}
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_debug_errno(link, r, "DHCPv4 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, "DHCPv4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
else if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 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->raw_data_len == 0)
switch (duid->type) {
case DUID_TYPE_LLT:
r = sd_dhcp_client_set_iaid_duid_llt(link->dhcp_client,
link->network->dhcp_iaid_set,
link->network->dhcp_iaid,
duid->llt_time);
break;
case DUID_TYPE_LL:
r = sd_dhcp_client_set_iaid_duid_ll(link->dhcp_client,
link->network->dhcp_iaid_set,
link->network->dhcp_iaid);
break;
case DUID_TYPE_EN:
r = sd_dhcp_client_set_iaid_duid_en(link->dhcp_client,
link->network->dhcp_iaid_set,
link->network->dhcp_iaid);
break;
case DUID_TYPE_UUID:
r = sd_dhcp_client_set_iaid_duid_uuid(link->dhcp_client,
link->network->dhcp_iaid_set,
link->network->dhcp_iaid);
break;
default:
r = sd_dhcp_client_set_iaid_duid_raw(link->dhcp_client,
link->network->dhcp_iaid_set,
link->network->dhcp_iaid,
duid->type, NULL, 0);
}
else
r = sd_dhcp_client_set_iaid_duid_raw(link->dhcp_client,
link->network->dhcp_iaid_set,
link->network->dhcp_iaid,
duid->type, duid->raw_data, duid->raw_data_len);
if (r < 0)
return r;
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_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set client ID: %m");
break;
}
default:
assert_not_reached();
}
return 0;
}
static int dhcp4_find_dynamic_address(Link *link, struct in_addr *ret) {
Address *a;
assert(link);
assert(link->network);
assert(ret);
if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
return false;
SET_FOREACH(a, link->addresses) {
if (a->source != NETWORK_CONFIG_SOURCE_FOREIGN)
continue;
if (a->family != AF_INET)
continue;
if (link_address_is_dynamic(link, a))
break;
}
if (!a)
return false;
*ret = a->in_addr.in;
return true;
}
static int dhcp4_set_request_address(Link *link) {
struct in_addr a;
assert(link);
assert(link->network);
assert(link->dhcp_client);
a = link->network->dhcp_request_address;
if (in4_addr_is_null(&a))
(void) dhcp4_find_dynamic_address(link, &a);
if (in4_addr_is_null(&a))
return 0;
log_link_debug(link, "DHCPv4 CLIENT: requesting %s.", IN4_ADDR_TO_STRING(&a));
return sd_dhcp_client_set_request_address(link->dhcp_client, &a);
}
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->dev && sd_device_get_property_value(link->dev, "ID_NET_DHCP_BROADCAST", &val) >= 0) {
r = parse_boolean(val);
if (r < 0)
log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to parse ID_NET_DHCP_BROADCAST, ignoring: %m");
else
log_link_debug(link, "DHCPv4 CLIENT: Detected ID_NET_DHCP_BROADCAST='%d'.", r);
}
return r == true;
}
static bool link_dhcp4_ipv6_only_mode(Link *link) {
assert(link);
assert(link->network);
if (link->network->dhcp_ipv6_only_mode >= 0)
return link->network->dhcp_ipv6_only_mode;
return link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link);
}
static int dhcp4_configure(Link *link) {
sd_dhcp_option *send_option;
void *request_options;
int r;
assert(link);
assert(link->network);
if (link->dhcp_client)
return log_link_debug_errno(link, SYNTHETIC_ERRNO(EBUSY), "DHCPv4 client is already configured.");
r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to allocate DHCPv4 client: %m");
r = sd_dhcp_client_attach_event(link->dhcp_client, link->manager->event, 0);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to attach event to DHCPv4 client: %m");
r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to attach device: %m");
r = sd_dhcp_client_set_rapid_commit(link->dhcp_client, link->network->dhcp_use_rapid_commit);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set rapid commit: %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_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set MAC address: %m");
r = sd_dhcp_client_set_ifindex(link->dhcp_client, link->ifindex);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set ifindex: %m");
r = sd_dhcp_client_set_callback(link->dhcp_client, dhcp4_handler, link);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for broadcast: %m");
r = dhcp_client_set_state_callback(link->dhcp_client, dhcp_client_callback_bus, link);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set state change callback: %m");
if (link->mtu > 0) {
r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set MTU: %m");
}
if (!link->network->dhcp_anonymize) {
r = dhcp4_set_request_address(link);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set initial DHCPv4 address: %m");
if (link->network->dhcp_use_mtu) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_MTU_INTERFACE);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for SIP server: %m");
}
if (link->network->dhcp_use_captive_portal) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_DHCP_CAPTIVE_PORTAL);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for captive portal: %m");
}
if (link->network->dhcp_use_timezone) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_TZDB_TIMEZONE);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for timezone: %m");
}
if (link->network->dhcp_use_6rd) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_6RD);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for 6rd: %m");
}
if (link_dhcp4_ipv6_only_mode(link)) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_IPV6_ONLY_PREFERRED);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set request flag for IPv6-only preferred option: %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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 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_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set IP service type: %m");
}
if (link->network->dhcp_socket_priority_set) {
r = sd_dhcp_client_set_socket_priority(link->dhcp_client, link->network->dhcp_socket_priority);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed to set socket priority: %m");
}
if (link->network->dhcp_fallback_lease_lifetime_usec > 0) {
r = sd_dhcp_client_set_fallback_lease_lifetime(link->dhcp_client, link->network->dhcp_fallback_lease_lifetime_usec);
if (r < 0)
return log_link_debug_errno(link, r, "DHCPv4 CLIENT: Failed set to lease lifetime: %m");
}
return dhcp4_set_client_identifier(link);
}
int dhcp4_update_mac(Link *link) {
bool restart;
int r;
assert(link);
if (!link->dhcp_client)
return 0;
restart = sd_dhcp_client_is_running(link->dhcp_client);
r = sd_dhcp_client_stop(link->dhcp_client);
if (r < 0)
return r;
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;
r = dhcp4_set_client_identifier(link);
if (r < 0)
return r;
if (restart) {
r = dhcp4_start(link);
if (r < 0)
return r;
}
return 0;
}
int dhcp4_update_ipv6_connectivity(Link *link) {
assert(link);
if (!link->network)
return 0;
if (!link->network->dhcp_ipv6_only_mode)
return 0;
if (!link->dhcp_client)
return 0;
/* If the client is running, set the current connectivity. */
if (sd_dhcp_client_is_running(link->dhcp_client))
return sd_dhcp_client_set_ipv6_connectivity(link->dhcp_client, link_has_ipv6_connectivity(link));
/* If the client has been already stopped or not started yet, let's check the current connectivity
* and start the client if necessary. */
if (link_has_ipv6_connectivity(link))
return 0;
return dhcp4_start_full(link, /* set_ipv6_connectivity = */ false);
}
int dhcp4_start_full(Link *link, bool set_ipv6_connectivity) {
int r;
assert(link);
assert(link->network);
if (!link->dhcp_client)
return 0;
if (!link_has_carrier(link))
return 0;
if (sd_dhcp_client_is_running(link->dhcp_client) > 0)
return 0;
r = sd_dhcp_client_start(link->dhcp_client);
if (r < 0)
return r;
if (set_ipv6_connectivity) {
r = dhcp4_update_ipv6_connectivity(link);
if (r < 0)
return r;
}
return 1;
}
int dhcp4_renew(Link *link) {
assert(link);
if (!link->dhcp_client)
return 0;
/* The DHCPv4 client may have been stopped by the IPv6 only mode. Let's unconditionally restart the
* client if it is not running. */
if (!sd_dhcp_client_is_running(link->dhcp_client))
return dhcp4_start(link);
/* The client may be waiting for IPv6 connectivity. Let's restart the client in that case. */
if (dhcp_client_get_state(link->dhcp_client) != DHCP_STATE_BOUND)
return sd_dhcp_client_interrupt_ipv6_only_mode(link->dhcp_client);
/* Otherwise, send a RENEW command. */
return sd_dhcp_client_send_renew(link->dhcp_client);
}
static int dhcp4_configure_duid(Link *link) {
assert(link);
assert(link->network);
if (link->network->dhcp_client_identifier != DHCP_CLIENT_ID_DUID)
return 1;
return dhcp_configure_duid(link, link_get_dhcp4_duid(link));
}
static int dhcp4_process_request(Request *req, Link *link, void *userdata) {
int r;
assert(link);
if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false))
return 0;
r = dhcp4_configure_duid(link);
if (r <= 0)
return r;
r = dhcp4_configure(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to configure DHCPv4 client: %m");
r = dhcp4_start(link);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
log_link_debug(link, "DHCPv4 client is configured%s.",
r > 0 ? ", acquiring DHCPv4 lease" : "");
return 1;
}
int link_request_dhcp4_client(Link *link) {
int r;
assert(link);
if (!link_dhcp4_enabled(link))
return 0;
if (link->dhcp_client)
return 0;
r = link_queue_request(link, REQUEST_TYPE_DHCP4_CLIENT, dhcp4_process_request, NULL);
if (r < 0)
return log_link_warning_errno(link, r, "Failed to request configuring of the DHCPv4 client: %m");
log_link_debug(link, "Requested configuring of the DHCPv4 client.");
return 0;
}
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 = ASSERT_PTR(data);
uint64_t a;
int r;
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_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) {
int *tos = ASSERT_PTR(data);
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue))
*tos = -1; /* use sd_dhcp_client's default (currently, CS6). */
else if (streq(rvalue, "none"))
*tos = 0;
else if (streq(rvalue, "CS4"))
*tos = IPTOS_CLASS_CS4;
else if (streq(rvalue, "CS6"))
*tos = IPTOS_CLASS_CS6;
else
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
return 0;
}
int config_parse_dhcp_socket_priority(
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 = ASSERT_PTR(data);
int a, r;
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
network->dhcp_socket_priority_set = false;
return 0;
}
r = safe_atoi(rvalue, &a);
if (r < 0) {
log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to parse socket priority, ignoring: %s", rvalue);
return 0;
}
network->dhcp_socket_priority_set = true;
network->dhcp_socket_priority = a;
return 0;
}
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;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
if (isempty(rvalue)) {
network->dhcp_fallback_lease_lifetime_usec = 0;
return 0;
}
/* We accept only "forever" or "infinity". */
if (!STR_IN_SET(rvalue, "forever", "infinity")) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid LeaseLifetime= value, ignoring: %s", rvalue);
return 0;
}
network->dhcp_fallback_lease_lifetime_usec = USEC_INFINITY;
return 0;
}
int config_parse_dhcp_label(
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) {
char **label = ASSERT_PTR(data);
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
*label = mfree(*label);
return 0;
}
if (!address_label_valid(rvalue)) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Address label is too long or invalid, ignoring assignment: %s", rvalue);
return 0;
}
return free_and_strdup_warn(label, rvalue);
}
static const char* const dhcp_client_identifier_table[_DHCP_CLIENT_ID_MAX] = {
[DHCP_CLIENT_ID_MAC] = "mac",
[DHCP_CLIENT_ID_DUID] = "duid",
};
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");
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