static int ipv4ll_address_lost(Link *link) {
_cleanup_address_free_ Address *address = NULL;
_cleanup_route_free_ Route *route = NULL;
struct in_addr addr;
int r;
assert(link);
link->ipv4ll_route = false;
link->ipv4ll_address = false;
r = sd_ipv4ll_get_address(link->ipv4ll, &addr);
if (r < 0)
return 0;
log_link_debug(link, "IPv4 link-local release %u.%u.%u.%u", ADDRESS_FMT_VAL(addr));
r = address_new(&address);
if (r < 0) {
log_link_error_errno(link, r, "Could not allocate address: %m");
return r;
}
address->family = AF_INET;
address->in_addr.in = addr;
address->prefixlen = 16;
address->scope = RT_SCOPE_LINK;
address_remove(address, link, &link_address_remove_handler);
r = route_new(&route);
if (r < 0) {
log_link_error_errno(link, r, "Could not allocate route: %m");
return r;
}
route->family = AF_INET;
route->scope = RT_SCOPE_LINK;
route->priority = IPV4LL_ROUTE_METRIC;
route_remove(route, link, &link_route_remove_handler);
link_check_ready(link);
return 0;
}
static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
int r;
Link *link = userdata;
assert(link);
assert(link->network);
assert(link->manager);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case DHCP6_EVENT_STOP:
case DHCP6_EVENT_RESEND_EXPIRE:
case DHCP6_EVENT_RETRANS_MAX:
log_link_debug(link, "DHCPv6 event %d", event);
break;
case DHCP6_EVENT_IP_ACQUIRE:
r = dhcp6_lease_address_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
/* fall through */
case DHCP6_EVENT_INFORMATION_REQUEST:
r = dhcp6_lease_information_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
break;
default:
if (event < 0)
log_link_warning(link, "DHCPv6 error: %s",
strerror(-event));
else
log_link_warning(link, "DHCPv6 unknown event: %d",
event);
return;
}
}
/* 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;
}
static int route_expire_callback(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
Link *link = userdata;
int r;
assert(rtnl);
assert(m);
assert(link);
assert(link->ifname);
assert(link->link_messages > 0);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return 1;
link->link_messages--;
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST)
log_link_warning_errno(link, r, "could not remove route: %m");
if (link->link_messages == 0)
log_link_debug(link, "route removed");
return 1;
}
