629548c405
networkctl: status command also shows logs of networkd
1716 lines
63 KiB
C
1716 lines
63 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
|
|
|
|
#include <netinet/in.h>
|
|
#include <linux/if.h>
|
|
#include <linux/if_arp.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"
|
|
|
|
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: %m");
|
|
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: %m");
|
|
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->network->dhcp_use_routes)
|
|
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;
|
|
}
|
|
}
|
|
|
|
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");
|
|
}
|
|
|
|
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_routes)
|
|
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_set_dhcp_option(link->dhcp_client, send_option);
|
|
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_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_user_class(
|
|
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 ***l = data;
|
|
int r;
|
|
|
|
assert(l);
|
|
assert(lvalue);
|
|
assert(rvalue);
|
|
|
|
if (isempty(rvalue)) {
|
|
*l = strv_free(*l);
|
|
return 0;
|
|
}
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *w = NULL;
|
|
|
|
r = extract_first_word(&rvalue, &w, NULL, 0);
|
|
if (r == -ENOMEM)
|
|
return log_oom();
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to split user classes option, ignoring: %s", rvalue);
|
|
break;
|
|
}
|
|
if (r == 0)
|
|
break;
|
|
|
|
if (strlen(w) > 255) {
|
|
log_syntax(unit, LOG_ERR, filename, line, 0,
|
|
"%s length is not in the range 1-255, ignoring.", w);
|
|
continue;
|
|
}
|
|
|
|
r = strv_push(l, w);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
w = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int config_parse_dhcp_request_options(
|
|
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_request_options = set_free(network->dhcp_request_options);
|
|
return 0;
|
|
}
|
|
|
|
for (p = rvalue;;) {
|
|
_cleanup_free_ char *n = NULL;
|
|
uint32_t i;
|
|
|
|
r = extract_first_word(&p, &n, NULL, 0);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to parse DHCP request option, ignoring assignment: %s",
|
|
rvalue);
|
|
return 0;
|
|
}
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
r = safe_atou32(n, &i);
|
|
if (r < 0) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"DHCP request option is invalid, ignoring assignment: %s", n);
|
|
continue;
|
|
}
|
|
|
|
if (i < 1 || i >= 255) {
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"DHCP request option is invalid, valid range is 1-254, ignoring assignment: %s", n);
|
|
continue;
|
|
}
|
|
|
|
r = set_ensure_allocated(&network->dhcp_request_options, NULL);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = set_put(network->dhcp_request_options, UINT32_TO_PTR(i));
|
|
if (r < 0)
|
|
log_syntax(unit, LOG_ERR, filename, line, r,
|
|
"Failed to store DHCP request option '%s', ignoring assignment: %m", n);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char* const dhcp_client_identifier_table[_DHCP_CLIENT_ID_MAX] = {
|
|
[DHCP_CLIENT_ID_MAC] = "mac",
|
|
[DHCP_CLIENT_ID_DUID] = "duid",
|
|
[DHCP_CLIENT_ID_DUID_ONLY] = "duid-only",
|
|
};
|
|
|
|
DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(dhcp_client_identifier, DHCPClientIdentifier);
|
|
DEFINE_CONFIG_PARSE_ENUM(config_parse_dhcp_client_identifier, dhcp_client_identifier, DHCPClientIdentifier,
|
|
"Failed to parse client identifier type");
|