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Systemd/src/network/networkd-dhcp4.c

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/* SPDX-License-Identifier: LGPL-2.1+ */
#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-util.h"
#include "parse-util.h"
#include "network-internal.h"
#include "networkd-dhcp4.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-network.h"
#include "string-table.h"
#include "string-util.h"
#include "sysctl-util.h"
#include "web-util.h"
static int dhcp_remove_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
static int dhcp_remove_dns_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all);
static int dhcp_remove_address(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, link_netlink_message_handler_t callback);
static int dhcp_remove_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link);
static int dhcp_lease_renew(sd_dhcp_client *client, Link *link);
void dhcp4_release_old_lease(Link *link) {
struct in_addr address = {}, address_old = {};
assert(link);
if (!link->dhcp_lease_old)
return;
assert(link->dhcp_lease);
(void) sd_dhcp_lease_get_address(link->dhcp_lease_old, &address_old);
(void) sd_dhcp_lease_get_address(link->dhcp_lease, &address);
(void) dhcp_remove_routes(link, link->dhcp_lease_old, &address_old, false);
(void) dhcp_remove_router(link, link->dhcp_lease_old, &address_old, false);
(void) dhcp_remove_dns_routes(link, link->dhcp_lease_old, &address_old, false);
if (!in4_addr_equal(&address_old, &address))
(void) dhcp_remove_address(link, link->dhcp_lease_old, &address_old, NULL);
link->dhcp_lease_old = sd_dhcp_lease_unref(link->dhcp_lease_old);
link_dirty(link);
}
static void dhcp4_check_ready(Link *link) {
if (link->dhcp4_messages == 0) {
link->dhcp4_configured = true;
/* New address and routes are configured now. Let's release old lease. */
dhcp4_release_old_lease(link);
link_check_ready(link);
}
}
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) {
if (link->dhcp4_route_failed) {
struct in_addr address = {};
link->dhcp4_route_failed = false;
link->dhcp4_route_retrying = true;
(void) sd_dhcp_lease_get_address(link->dhcp_lease, &address);
(void) dhcp_remove_routes(link, link->dhcp_lease, &address, true);
(void) dhcp_remove_router(link, link->dhcp_lease, &address, true);
(void) dhcp_remove_dns_routes(link, link->dhcp_lease, &address, true);
(void) dhcp_remove_address(link, link->dhcp_lease, &address, dhcp_remove_address_handler);
return 1;
}
if (!link->network->dhcp_send_decline)
dhcp4_check_ready(link);
}
return 1;
}
static int route_scope_from_address(const Route *route, const struct in_addr *self_addr) {
assert(route);
assert(self_addr);
if (in4_addr_is_localhost(&route->dst.in) ||
(!in4_addr_is_null(self_addr) && in4_addr_equal(&route->dst.in, self_addr)))
return RT_SCOPE_HOST;
else if (in4_addr_is_null(&route->gw.in))
return RT_SCOPE_LINK;
else
return RT_SCOPE_UNIVERSE;
}
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 dhcp_route_configure(Route **route, Link *link) {
int r;
assert(route);
assert(*route);
assert(link);
if (set_contains(link->dhcp_routes, *route))
return 0;
r = route_configure(*route, link, dhcp4_route_handler);
if (r <= 0)
return r;
link->dhcp4_messages++;
r = set_put(link->dhcp_routes, *route);
if (r < 0)
return r;
TAKE_PTR(*route);
return 0;
}
static int link_set_dns_routes(Link *link, const struct in_addr *address) {
const struct in_addr *dns;
uint32_t table;
int i, n, r;
assert(link);
assert(link->dhcp_lease);
assert(link->network);
if (!link->network->dhcp_use_dns ||
!link->network->dhcp_routes_to_dns)
return 0;
n = sd_dhcp_lease_get_dns(link->dhcp_lease, &dns);
if (IN_SET(n, 0, -ENODATA))
return 0;
if (n < 0)
return log_link_warning_errno(link, n, "DHCP error: could not get DNS servers: %m");
table = link_get_dhcp_route_table(link);
for (i = 0; i < n; i ++) {
_cleanup_(route_freep) Route *route = NULL;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
/* Set routes to DNS servers. */
route->family = AF_INET;
route->dst.in = dns[i];
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 = table;
r = dhcp_route_configure(&route, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not set route to DNS server: %m");
}
return 0;
}
static int dhcp_prefix_route_from_lease(
const sd_dhcp_lease *lease,
uint32_t table,
const struct in_addr *address,
Route **ret_route) {
Route *route;
struct in_addr netmask;
int r;
r = sd_dhcp_lease_get_netmask((sd_dhcp_lease*) 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 = table;
*ret_route = route;
return 0;
}
static int link_set_dhcp_routes(Link *link) {
_cleanup_free_ sd_dhcp_route **static_routes = NULL;
bool classless_route = false, static_route = false;
const struct in_addr *router;
struct in_addr address;
int r, n, i;
uint32_t table;
assert(link);
if (!link->dhcp_lease) /* link went down while we configured the IP addresses? */
return 0;
if (!link->network) /* link went down while we configured the IP addresses? */
return 0;
if (!link_has_carrier(link) && !link->network->configure_without_carrier)
/* During configuring addresses, the link lost its carrier. As networkd is dropping
* the addresses now, let's not configure the routes either. */
return 0;
r = set_ensure_allocated(&link->dhcp_routes, &route_hash_ops);
if (r < 0)
return log_oom();
/* Clear old entries in case the set was already allocated */
set_clear(link->dhcp_routes);
table = link_get_dhcp_route_table(link);
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: could not get address: %m");
if (!link_prefixroute(link)) {
_cleanup_(route_freep) Route *prefix_route = NULL;
r = dhcp_prefix_route_from_lease(link->dhcp_lease, table, &address, &prefix_route);
if (r < 0)
return log_link_error_errno(link, r, "Could not create prefix route: %m");
r = dhcp_route_configure(&prefix_route, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not set prefix route: %m");
}
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
if (n == -ENODATA)
log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
else if (n < 0)
log_link_debug_errno(link, n, "DHCP: could not get routes: %m");
for (i = 0; i < n; i++) {
switch (sd_dhcp_route_get_option(static_routes[i])) {
case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
classless_route = true;
break;
case SD_DHCP_OPTION_STATIC_ROUTE:
static_route = true;
break;
}
}
if (link->network->dhcp_use_routes) {
for (i = 0; i < n; i++) {
_cleanup_(route_freep) Route *route = NULL;
/* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
the DHCP client MUST ignore the Static Routes option. */
if (classless_route &&
sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
continue;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->protocol = RTPROT_DHCP;
assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
route->priority = link->network->dhcp_route_metric;
route->table = table;
route->mtu = link->network->dhcp_route_mtu;
route->scope = route_scope_from_address(route, &address);
if (IN_SET(route->scope, RT_SCOPE_LINK, RT_SCOPE_UNIVERSE))
route->prefsrc.in = address;
if (set_contains(link->dhcp_routes, route))
continue;
r = dhcp_route_configure(&route, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not set route: %m");
}
}
if (link->network->dhcp_use_gateway) {
r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
if (IN_SET(r, 0, -ENODATA))
log_link_info(link, "DHCP: No gateway received from DHCP server.");
else if (r < 0)
log_link_warning_errno(link, r, "DHCP error: could not get gateway: %m");
else if (in4_addr_is_null(&router[0]))
log_link_info(link, "DHCP: Received gateway is null.");
/* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
a Router option, the DHCP client MUST ignore the Router option. */
if (classless_route && static_route)
log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option and router option");
if (r > 0 && !classless_route && !in4_addr_is_null(&router[0])) {
_cleanup_(route_freep) Route *route = NULL, *route_gw = NULL;
r = route_new(&route_gw);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
/* The dhcp netmask may mask out the gateway. Add an explicit
* route for the gw host so that we can route no matter the
* netmask or existing kernel route tables. */
route_gw->family = AF_INET;
route_gw->dst.in = router[0];
route_gw->dst_prefixlen = 32;
route_gw->prefsrc.in = address;
route_gw->scope = RT_SCOPE_LINK;
route_gw->protocol = RTPROT_DHCP;
route_gw->priority = link->network->dhcp_route_metric;
route_gw->table = table;
route_gw->mtu = link->network->dhcp_route_mtu;
r = dhcp_route_configure(&route_gw, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not set host route: %m");
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->gw.in = router[0];
route->prefsrc.in = address;
route->protocol = RTPROT_DHCP;
route->priority = link->network->dhcp_route_metric;
route->table = table;
route->mtu = link->network->dhcp_route_mtu;
r = dhcp_route_configure(&route, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not set router: %m");
}
Route *rt;
LIST_FOREACH(routes, rt, link->network->static_routes) {
if (!rt->gateway_from_dhcp)
continue;
if (rt->family != AF_INET)
continue;
rt->gw.in = router[0];
r = route_configure(rt, link, dhcp4_route_handler);
if (r < 0)
return log_link_error_errno(link, r, "Could not set gateway: %m");
if (r > 0)
link->dhcp4_messages++;
}
}
return link_set_dns_routes(link, &address);
}
static int dhcp_remove_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
_cleanup_free_ sd_dhcp_route **routes = NULL;
uint32_t table;
int n, i, r;
assert(link);
assert(address);
if (!link->network->dhcp_use_routes)
return 0;
n = sd_dhcp_lease_get_routes(lease, &routes);
if (IN_SET(n, 0, -ENODATA))
return 0;
else if (n < 0)
return log_link_error_errno(link, n, "DHCP error: Failed to get routes: %m");
table = link_get_dhcp_route_table(link);
for (i = 0; i < n; i++) {
_cleanup_(route_freep) Route *route = NULL;
r = route_new(&route);
if (r < 0)
return log_oom();
route->family = AF_INET;
assert_se(sd_dhcp_route_get_gateway(routes[i], &route->gw.in) >= 0);
assert_se(sd_dhcp_route_get_destination(routes[i], &route->dst.in) >= 0);
assert_se(sd_dhcp_route_get_destination_prefix_length(routes[i], &route->dst_prefixlen) >= 0);
route->priority = link->network->dhcp_route_metric;
route->table = table;
route->scope = route_scope_from_address(route, address);
if (IN_SET(route->scope, RT_SCOPE_LINK, RT_SCOPE_UNIVERSE))
route->prefsrc.in = *address;
if (!remove_all && set_contains(link->dhcp_routes, route))
continue;
(void) route_remove(route, link, NULL);
}
return n;
}
static int dhcp_remove_router(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
_cleanup_(route_freep) Route *route_gw = NULL, *route = NULL;
const struct in_addr *router;
uint32_t table;
int r;
assert(link);
assert(address);
if (!link->network->dhcp_use_gateway)
return 0;
r = sd_dhcp_lease_get_router(lease, &router);
if (IN_SET(r, 0, -ENODATA)) {
log_link_debug(link, "DHCP: No gateway received from DHCP server.");
return 0;
} else if (r < 0)
return log_link_error_errno(link, r, "DHCP error: could not get gateway: %m");
else if (in4_addr_is_null(&router[0])) {
log_link_info(link, "DHCP: Received gateway is null, ignoring.");
return 0;
}
table = link_get_dhcp_route_table(link);
r = route_new(&route_gw);
if (r < 0)
return log_oom();
route_gw->family = AF_INET;
route_gw->dst.in = router[0];
route_gw->dst_prefixlen = 32;
route_gw->prefsrc.in = *address;
route_gw->scope = RT_SCOPE_LINK;
route_gw->protocol = RTPROT_DHCP;
route_gw->priority = link->network->dhcp_route_metric;
route_gw->table = table;
if (remove_all || !set_contains(link->dhcp_routes, route_gw))
(void) route_remove(route_gw, link, NULL);
r = route_new(&route);
if (r < 0)
return log_oom();
route->family = AF_INET;
route->gw.in = router[0];
route->prefsrc.in = *address;
route->protocol = RTPROT_DHCP;
route->priority = link->network->dhcp_route_metric;
route->table = table;
if (remove_all || !set_contains(link->dhcp_routes, route))
(void) route_remove(route, link, NULL);
Route *rt;
LIST_FOREACH(routes, rt, link->network->static_routes) {
if (!rt->gateway_from_dhcp)
continue;
if (rt->family != AF_INET)
continue;
if (!remove_all && in4_addr_equal(router, &rt->gw.in))
continue;
(void) route_remove(rt, link, NULL);
}
return 0;
}
static int dhcp_remove_dns_routes(Link *link, sd_dhcp_lease *lease, const struct in_addr *address, bool remove_all) {
const struct in_addr *dns;
uint32_t table;
int i, n, r;
assert(link);
assert(lease);
assert(link->network);
if (!link->network->dhcp_use_dns ||
!link->network->dhcp_routes_to_dns)
return 0;
n = sd_dhcp_lease_get_dns(lease, &dns);
if (IN_SET(n, 0, -ENODATA))
return 0;
if (n < 0)
return log_link_warning_errno(link, n, "DHCP error: could not get DNS servers: %m");
table = link_get_dhcp_route_table(link);
for (i = 0; i < n; i ++) {
_cleanup_(route_freep) Route *route = NULL;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->dst.in = dns[i];
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 = table;
if (!remove_all && set_contains(link->dhcp_routes, route))
continue;
(void) route_remove(route, link, NULL);
}
if (!link_prefixroute(link)) {
_cleanup_(route_freep) Route *prefix_route = NULL;
r = dhcp_prefix_route_from_lease(lease, table, address, &prefix_route);
if (r < 0)
return log_link_warning_errno(link, r, "Could not delete prefix route: %m");
if (remove_all || !set_contains(link->dhcp_routes, prefix_route))
(void) route_remove(prefix_route, link, NULL);
}
return 0;
}
static int dhcp_remove_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
/* This is only used when retrying to assign the address received from DHCPv4 server.
* See dhcp4_route_handler(). */
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0)
log_link_message_warning_errno(link, m, r, "Failed to remove DHCPv4 address, ignoring");
else
(void) manager_rtnl_process_address(rtnl, m, link->manager);
(void) dhcp_lease_renew(link->dhcp_client, link);
return 1;
}
static int dhcp_remove_address(
Link *link, sd_dhcp_lease *lease,
const struct in_addr *address,
link_netlink_message_handler_t callback) {
_cleanup_(address_freep) Address *a = NULL;
struct in_addr netmask;
int r;
assert(link);
assert(address);
if (in4_addr_is_null(address))
return 0;
r = address_new(&a);
if (r < 0)
return log_oom();
a->family = AF_INET;
a->in_addr.in = *address;
if (sd_dhcp_lease_get_netmask(lease, &netmask) >= 0)
a->prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
(void) address_remove(a, link, callback);
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 < 0)
return r;
if (link->original_mtu == mtu)
return 0;
r = link_set_mtu(link, link->original_mtu);
if (r < 0) {
log_link_error_errno(link, r, "DHCP error: could not reset MTU: %m");
link_enter_failed(link);
return r;
}
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 dhcp_lease_lost(Link *link) {
struct in_addr address = {};
assert(link);
assert(link->dhcp_lease);
log_link_info(link, "DHCP lease lost");
link->dhcp4_configured = false;
(void) sd_dhcp_lease_get_address(link->dhcp_lease, &address);
(void) dhcp_remove_routes(link, link->dhcp_lease, &address, true);
(void) dhcp_remove_router(link, link->dhcp_lease, &address, true);
(void) dhcp_remove_dns_routes(link, link->dhcp_lease, &address, true);
(void) dhcp_remove_address(link, link->dhcp_lease, &address, NULL);
(void) dhcp_reset_mtu(link);
(void) dhcp_reset_hostname(link);
link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
link_dirty(link);
return 0;
}
static void dhcp_address_on_acd(sd_ipv4acd *acd, int event, void *userdata) {
_cleanup_free_ char *pretty = NULL;
union in_addr_union address = {};
Link *link;
int r;
assert(acd);
assert(userdata);
link = userdata;
switch (event) {
case SD_IPV4ACD_EVENT_STOP:
log_link_debug(link, "Stopping ACD client for DHCP4...");
return;
case SD_IPV4ACD_EVENT_BIND:
if (DEBUG_LOGGING) {
(void) sd_dhcp_lease_get_address(link->dhcp_lease, &address.in);
(void) in_addr_to_string(AF_INET, &address, &pretty);
log_link_debug(link, "Successfully claimed DHCP4 address %s", strna(pretty));
}
dhcp4_check_ready(link);
break;
case SD_IPV4ACD_EVENT_CONFLICT:
(void) sd_dhcp_lease_get_address(link->dhcp_lease, &address.in);
(void) in_addr_to_string(AF_INET, &address, &pretty);
log_link_warning(link, "DAD conflict. Dropping DHCP4 address %s", strna(pretty));
(void) sd_dhcp_client_send_decline(link->dhcp_client);
if (link->dhcp_lease) {
r = dhcp_lease_lost(link);
if (r < 0)
link_enter_failed(link);
}
break;
default:
assert_not_reached("Invalid IPv4ACD event.");
}
sd_ipv4acd_stop(acd);
return;
}
static int configure_dhcpv4_duplicate_address_detection(Link *link) {
int r;
assert(link);
r = sd_ipv4acd_new(&link->network->dhcp_acd);
if (r < 0)
return r;
r = sd_ipv4acd_attach_event(link->network->dhcp_acd, NULL, 0);
if (r < 0)
return r;
r = sd_ipv4acd_set_ifindex(link->network->dhcp_acd, link->ifindex);
if (r < 0)
return r;
r = sd_ipv4acd_set_mac(link->network->dhcp_acd, &link->mac);
if (r < 0)
return r;
return 0;
}
static int dhcp4_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
int r;
assert(link);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
log_link_message_warning_errno(link, m, r, "Could not set DHCPv4 address");
link_enter_failed(link);
return 1;
} else if (r >= 0)
(void) manager_rtnl_process_address(rtnl, m, link->manager);
r = link_set_dhcp_routes(link);
if (r < 0) {
link_enter_failed(link);
return 1;
}
/* Add back static routes since kernel removes while DHCPv4 address is removed from when lease expires */
r = link_request_set_routes(link);
if (r < 0) {
link_enter_failed(link);
return 1;
}
if (link->network->dhcp_send_decline) {
union in_addr_union addr;
(void) sd_dhcp_lease_get_address(link->dhcp_lease, &addr.in);
r = sd_ipv4acd_set_address(link->network->dhcp_acd, &addr.in);
if (r < 0)
return r;
r = sd_ipv4acd_set_callback(link->network->dhcp_acd, dhcp_address_on_acd, link);
if (r < 0)
return r;
if (DEBUG_LOGGING) {
_cleanup_free_ char *pretty = NULL;
(void) in_addr_to_string(AF_INET, &addr, &pretty);
log_link_debug(link, "Starting IPv4ACD client. Probing DHCPv4 address %s", strna(pretty));
}
r = sd_ipv4acd_start(link->network->dhcp_acd, true);
if (r < 0)
log_link_warning_errno(link, r, "Failed to start IPv4ACD client, ignoring: %m");
} else
dhcp4_check_ready(link);
return 1;
}
static int dhcp4_update_address(Link *link,
struct in_addr *address,
struct in_addr *netmask,
uint32_t lifetime) {
_cleanup_(address_freep) Address *addr = NULL;
unsigned prefixlen;
int r;
assert(address);
assert(netmask);
assert(lifetime);
prefixlen = in4_addr_netmask_to_prefixlen(netmask);
r = address_new(&addr);
if (r < 0)
return r;
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;
addr->broadcast.s_addr = address->s_addr | ~netmask->s_addr;
addr->prefix_route = link_prefixroute(link);
/* allow reusing an existing address and simply update its lifetime
* in case it already exists */
r = address_configure(addr, link, dhcp4_address_handler, true);
if (r < 0)
return r;
return 0;
}
static int dhcp_lease_renew(sd_dhcp_client *client, Link *link) {
sd_dhcp_lease *lease;
struct in_addr address;
struct in_addr netmask;
uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
int r;
assert(link);
assert(client);
assert(link->network);
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->dhcp4_configured = false;
link->dhcp_lease = sd_dhcp_lease_ref(lease);
link_dirty(link);
r = sd_dhcp_lease_get_address(lease, &address);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: no address: %m");
r = sd_dhcp_lease_get_netmask(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");
}
r = dhcp4_update_address(link, &address, &netmask, lifetime);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update IP address: %m");
return 0;
}
static int dhcp_lease_acquired(sd_dhcp_client *client, Link *link) {
const struct in_addr *router;
sd_dhcp_lease *lease;
struct in_addr address;
struct in_addr netmask;
unsigned prefixlen;
uint32_t lifetime = CACHE_INFO_INFINITY_LIFE_TIME;
int r;
assert(client);
assert(link);
link->dhcp4_configured = false;
r = sd_dhcp_client_get_lease(client, &lease);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: No lease: %m");
r = sd_dhcp_lease_get_address(lease, &address);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: No address: %m");
r = sd_dhcp_lease_get_netmask(lease, &netmask);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: No netmask: %m");
prefixlen = in4_addr_netmask_to_prefixlen(&netmask);
if (!FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP)) {
r = sd_dhcp_lease_get_lifetime(lease, &lifetime);
if (r < 0)
return log_link_warning_errno(link, r, "DHCP error: no lifetime: %m");
}
r = sd_dhcp_lease_get_router(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_null(&router[0]))
log_struct(LOG_INFO,
LOG_LINK_INTERFACE(link),
LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u via %u.%u.%u.%u",
ADDRESS_FMT_VAL(address),
prefixlen,
ADDRESS_FMT_VAL(router[0])),
"ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
"PREFIXLEN=%u", prefixlen,
"GATEWAY=%u.%u.%u.%u", ADDRESS_FMT_VAL(router[0]));
else
log_struct(LOG_INFO,
LOG_LINK_INTERFACE(link),
LOG_LINK_MESSAGE(link, "DHCPv4 address %u.%u.%u.%u/%u",
ADDRESS_FMT_VAL(address),
prefixlen),
"ADDRESS=%u.%u.%u.%u", ADDRESS_FMT_VAL(address),
"PREFIXLEN=%u", prefixlen);
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_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);
}
}
r = dhcp4_update_address(link, &address, &netmask, lifetime);
if (r < 0)
return log_link_warning_errno(link, r, "Could not update IP address: %m");
return 0;
}
static int dhcp_lease_ip_change(sd_dhcp_client *client, Link *link) {
int r;
link->dhcp_lease_old = TAKE_PTR(link->dhcp_lease);
/* On ip address change, to keep the connectability, we would like to assign new address and
* routes, and then release old lease. There are two possible success paths:
*
* 1. new address and routes are configured.
* -> handled by dhcp_release_old_lease() in dhcp4_route_handler().
* 2. new address is configured and no route is requested.
* -> handled by dhcp_release_old_lease() in dhcp4_address_handler().
*
* On error in assigning new address and routes, then the link always enters to the failed
* state. And link_enter_failed() leads to the DHCP client to be stopped. So,
* dhcp_release_old_lease() will be also called by link_stop_clients().
*/
r = dhcp_lease_acquired(client, link);
if (r < 0) {
/* If it fails, then the new address is not configured yet.
* So, let's simply drop the old lease. */
sd_dhcp_lease_unref(link->dhcp_lease);
link->dhcp_lease = TAKE_PTR(link->dhcp_lease_old);
(void) dhcp_lease_lost(link);
return r;
}
return 0;
}
static int dhcp_server_is_black_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_black_listed_ip, UINT32_TO_PTR(addr.s_addr))) {
log_struct(LOG_DEBUG,
LOG_LINK_INTERFACE(link),
LOG_LINK_MESSAGE(link, "DHCPv4 ip '%u.%u.%u.%u' found in black listed ip addresses, ignoring offer",
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_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4)) {
assert(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)
(void) sd_dhcp_client_send_release(client);
r = dhcp_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 = dhcp_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_black_listed(link, client);
if (r < 0)
return r;
if (r != 0)
return -ENOMSG;
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 r;
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_warning_errno(link, r, "DHCP4 CLIENT: Failed to set hostname from kernel hostname, ignoring: %m");
else if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set hostname: %m");
return 0;
}
static bool promote_secondaries_enabled(const char *ifname) {
_cleanup_free_ char *promote_secondaries_sysctl = NULL;
char *promote_secondaries_path;
int r;
promote_secondaries_path = strjoina("net/ipv4/conf/", ifname, "/promote_secondaries");
r = sysctl_read(promote_secondaries_path, &promote_secondaries_sysctl);
if (r < 0) {
log_debug_errno(r, "Cannot read sysctl %s", promote_secondaries_path);
return false;
}
truncate_nl(promote_secondaries_sysctl);
r = parse_boolean(promote_secondaries_sysctl);
if (r < 0)
log_warning_errno(r, "Cannot parse sysctl %s with content %s as boolean", promote_secondaries_path, promote_secondaries_sysctl);
return r > 0;
}
/* dhcp4_set_promote_secondaries will ensure this interface has
* the "promote_secondaries" option in the kernel set. If this sysctl
* is not set DHCP will work only as long as the IP address does not
* changes between leases. The kernel will remove all secondary IP
* addresses of an interface otherwise. The way systemd-network works
* is that the new IP of a lease is added as a secondary IP and when
* the primary one expires it relies on the kernel to promote the
* secondary IP. See also https://github.com/systemd/systemd/issues/7163
*/
int dhcp4_set_promote_secondaries(Link *link) {
int r;
assert(link);
assert(link->network);
assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
/* check if the kernel has promote_secondaries enabled for our
* interface. If it is not globally enabled or enabled for the
* specific interface we must either enable it.
*/
if (!(promote_secondaries_enabled("all") || promote_secondaries_enabled(link->ifname))) {
char *promote_secondaries_path = NULL;
log_link_debug(link, "promote_secondaries is unset, setting it");
promote_secondaries_path = strjoina("net/ipv4/conf/", link->ifname, "/promote_secondaries");
r = sysctl_write(promote_secondaries_path, "1");
if (r < 0)
log_link_warning_errno(link, r, "cannot set sysctl %s to 1", promote_secondaries_path);
return r > 0;
}
return 0;
}
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_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->iaid_set,
link->network->iaid,
duid->llt_time);
else
r = sd_dhcp_client_set_iaid_duid(link->dhcp_client,
link->network->iaid_set,
link->network->iaid,
duid->type,
duid->raw_data_len > 0 ? duid->raw_data : NULL,
duid->raw_data_len);
if (r < 0)
return log_link_error_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_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_error_errno(link, r, "DHCP4 CLIENT: Failed to set DUID: %m");
break;
}
case DHCP_CLIENT_ID_MAC:
r = sd_dhcp_client_set_client_id(link->dhcp_client,
ARPHRD_ETHER,
(const uint8_t *) &link->mac,
sizeof(link->mac));
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set client ID: %m");
break;
default:
assert_not_reached("Unknown client identifier type.");
}
return 0;
}
int dhcp4_configure(Link *link) {
sd_dhcp_option *send_option;
void *request_options;
Iterator i;
int r;
assert(link);
assert(link->network);
assert(link->network->dhcp & ADDRESS_FAMILY_IPV4);
if (!link->dhcp_client) {
r = sd_dhcp_client_new(&link->dhcp_client, link->network->dhcp_anonymize);
if (r == -ENOMEM)
return log_oom();
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to create DHCP4 client: %m");
r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to attach event: %m");
}
r = sd_dhcp_client_set_mac(link->dhcp_client,
(const uint8_t *) &link->mac,
sizeof (link->mac), ARPHRD_ETHER);
if (r < 0)
return log_link_error_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_error_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_error_errno(link, r, "DHCP4 CLIENT: Failed to set callback: %m");
r = sd_dhcp_client_set_request_broadcast(link->dhcp_client,
link->network->dhcp_broadcast);
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for broadcast: %m");
if (link->mtu) {
r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set MTU: %m");
}
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_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for MTU: %m");
}
/* NOTE: even if this variable is called "use", it also "sends" PRL
* options, maybe there should be a different configuration variable
* to send or not route options?. */
/* NOTE: when using Anonymize=yes, routes PRL options are sent
* by default, so they don't need to be added here. */
if (link->network->dhcp_use_routes && !link->network->dhcp_anonymize) {
r = sd_dhcp_client_set_request_option(link->dhcp_client,
SD_DHCP_OPTION_STATIC_ROUTE);
if (r < 0)
return log_link_error_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_error_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 && !link->network->dhcp_anonymize) {
r = sd_dhcp_client_set_request_option(link->dhcp_client, SD_DHCP_OPTION_DOMAIN_SEARCH_LIST);
if (r < 0)
return log_link_error_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_error_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_error_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_error_errno(link, r, "DHCP4 CLIENT: Failed to set request flag for timezone: %m");
}
SET_FOREACH(request_options, link->network->dhcp_request_options, i) {
uint32_t option = PTR_TO_UINT32(request_options);
r = sd_dhcp_client_set_request_option(link->dhcp_client, option);
if (r == -EEXIST) {
log_link_debug(link, "DHCP4 CLIENT: Failed to set request flag for '%u' already exists, ignoring.", option);
continue;
}
if (r < 0)
return log_link_error_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, i) {
r = sd_dhcp_client_add_option(link->dhcp_client, send_option);
if (r == -EEXIST)
continue;
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set send option: %m");
}
ORDERED_HASHMAP_FOREACH(send_option, link->network->dhcp_client_send_vendor_options, i) {
r = sd_dhcp_client_add_vendor_option(link->dhcp_client, send_option);
if (r == -EEXIST)
continue;
if (r < 0)
return log_link_error_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_error_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_error_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, (const char **) link->network->dhcp_user_class);
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set user class: %m");
}
if (link->network->dhcp_client_port) {
r = sd_dhcp_client_set_client_port(link->dhcp_client, link->network->dhcp_client_port);
if (r < 0)
return log_link_error_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_error_errno(link, r, "DHCP4 CLIENT: Failed to set max attempts: %m");
}
if (link->network->ip_service_type > 0) {
r = sd_dhcp_client_set_service_type(link->dhcp_client, link->network->ip_service_type);
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to set ip service type: %m");
}
if (link->network->dhcp_send_decline) {
r = configure_dhcpv4_duplicate_address_detection(link);
if (r < 0)
return log_link_error_errno(link, r, "DHCP4 CLIENT: Failed to configure service type: %m");
}
return dhcp4_set_client_identifier(link);
}
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_t) -1;
return 0;
}
r = safe_atou64(rvalue, &a);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse DHCP maximum attempts, ignoring: %s", rvalue);
return 0;
}
if (a == 0) {
log_syntax(unit, LOG_ERR, 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_black_listed_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;
const char *p;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if (isempty(rvalue)) {
network->dhcp_black_listed_ip = set_free(network->dhcp_black_listed_ip);
return 0;
}
for (p = rvalue;;) {
_cleanup_free_ char *n = NULL;
union in_addr_union ip;
r = extract_first_word(&p, &n, NULL, 0);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to parse DHCP black listed ip address, ignoring assignment: %s",
rvalue);
return 0;
}
if (r == 0)
return 0;
r = in_addr_from_string(AF_INET, n, &ip);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r,
"DHCP black listed ip address is invalid, ignoring assignment: %s", n);
continue;
}
r = set_ensure_allocated(&network->dhcp_black_listed_ip, NULL);
if (r < 0)
return log_oom();
r = set_put(network->dhcp_black_listed_ip, UINT32_TO_PTR(ip.in.s_addr));
if (r < 0)
log_syntax(unit, LOG_ERR, filename, line, r,
"Failed to store DHCP black listed ip address '%s', ignoring assignment: %m", n);
}
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) {
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_ERR, 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_ERR, filename, line, 0,
"Failed to parse MUD URL '%s', ignoring: %m", rvalue);
return 0;
}
return free_and_strdup_warn(&network->dhcp_mudurl, unescaped);
}
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");
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