blob: 6ba2d170e793f5f69d84038cb103bc02a61e442e [file] [log] [blame] [raw]
/***
This file is part of systemd.
Copyright (C) 2014 Intel Corporation. All rights reserved.
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <netinet/ether.h>
#include <linux/if.h>
#include "sd-dhcp6-client.h"
#include "network-internal.h"
#include "networkd-link.h"
#include "networkd-manager.h"
static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link);
static int dhcp6_lease_information_acquired(sd_dhcp6_client *client,
Link *link) {
return 0;
}
static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
void *userdata) {
_cleanup_link_unref_ Link *link = userdata;
int r;
assert(link);
r = sd_netlink_message_get_errno(m);
if (r < 0 && r != -EEXIST) {
if (link->rtnl_extended_attrs) {
log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism");
link->rtnl_extended_attrs = false;
dhcp6_lease_address_acquired(link->dhcp6_client, link);
return 1;
}
log_link_error_errno(link, r, "Could not set DHCPv6 address: %m");
link_enter_failed(link);
} else if (r >= 0)
manager_rtnl_process_address(rtnl, m, link->manager);
return 1;
}
static int dhcp6_address_change(
Link *link,
struct in6_addr *ip6_addr,
uint32_t lifetime_preferred,
uint32_t lifetime_valid) {
_cleanup_address_free_ Address *addr = NULL;
char buffer[INET6_ADDRSTRLEN];
int r;
r = address_new(&addr);
if (r < 0)
return r;
addr->family = AF_INET6;
memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr));
addr->flags = IFA_F_NOPREFIXROUTE;
addr->prefixlen = 128;
addr->cinfo.ifa_prefered = lifetime_preferred;
addr->cinfo.ifa_valid = lifetime_valid;
log_link_info(link,
"DHCPv6 address %s/%d timeout preferred %d valid %d",
inet_ntop(AF_INET6, &addr->in_addr.in6, buffer, sizeof(buffer)),
addr->prefixlen, lifetime_preferred, lifetime_valid);
r = address_configure(addr, link, dhcp6_address_handler, true);
if (r < 0)
log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m");
return r;
}
static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) {
int r;
sd_dhcp6_lease *lease;
struct in6_addr ip6_addr;
uint32_t lifetime_preferred, lifetime_valid;
r = sd_dhcp6_client_get_lease(client, &lease);
if (r < 0)
return r;
sd_dhcp6_lease_reset_address_iter(lease);
while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
&lifetime_preferred,
&lifetime_valid) >= 0) {
r = dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid);
if (r < 0)
return r;
}
return 0;
}
static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
int r;
Link *link = userdata;
assert(link);
assert(link->network);
if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
return;
switch(event) {
case SD_DHCP6_CLIENT_EVENT_STOP:
case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
if (sd_dhcp6_client_get_lease(client, NULL) >= 0)
log_link_warning(link, "DHCPv6 lease lost");
link->dhcp6_configured = false;
break;
case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
r = dhcp6_lease_address_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
/* fall through */
case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
r = dhcp6_lease_information_acquired(client, link);
if (r < 0) {
link_enter_failed(link);
return;
}
link->dhcp6_configured = true;
break;
default:
if (event < 0)
log_link_warning_errno(link, event, "DHCPv6 error: %m");
else
log_link_warning(link, "DHCPv6 unknown event: %d", event);
return;
}
link_check_ready(link);
}
int dhcp6_request_address(Link *link, int ir) {
int r, inf_req;
bool running;
assert(link);
assert(link->dhcp6_client);
assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
r = sd_dhcp6_client_is_running(link->dhcp6_client);
if (r < 0)
return r;
else
running = !!r;
if (running) {
r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req);
if (r < 0)
return r;
if (inf_req == ir)
return 0;
r = sd_dhcp6_client_stop(link->dhcp6_client);
if (r < 0)
return r;
} else {
r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
if (r < 0)
return r;
}
r = sd_dhcp6_client_set_information_request(link->dhcp6_client, ir);
if (r < 0)
return r;
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0)
return r;
return 0;
}
int dhcp6_configure(Link *link) {
sd_dhcp6_client *client = NULL;
int r;
const DUID *duid;
assert(link);
if (link->dhcp6_client)
return 0;
r = sd_dhcp6_client_new(&client);
if (r < 0)
return r;
r = sd_dhcp6_client_attach_event(client, NULL, 0);
if (r < 0)
goto error;
r = sd_dhcp6_client_set_mac(client,
(const uint8_t *) &link->mac,
sizeof (link->mac), ARPHRD_ETHER);
if (r < 0)
goto error;
r = sd_dhcp6_client_set_iaid(client, link->network->iaid);
if (r < 0)
goto error;
duid = link_duid(link);
r = sd_dhcp6_client_set_duid(client,
duid->type,
duid->raw_data_len > 0 ? duid->raw_data : NULL,
duid->raw_data_len);
if (r < 0)
goto error;
r = sd_dhcp6_client_set_ifindex(client, link->ifindex);
if (r < 0)
goto error;
r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link);
if (r < 0)
goto error;
link->dhcp6_client = client;
return 0;
error:
sd_dhcp6_client_unref(client);
return r;
}