networkd-dhcp6.c revision e53fc357a9bb9d0a5362ccc4246d598cb0febd5e
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 "networkd-link.h"
#include "network-internal.h"
#include "sd-icmp6-nd.h"
#include "sd-dhcp6-client.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)
link_rtnl_process_address(rtnl, m, link->manager);
return 1;
}
static int dhcp6_address_update(Link *link, struct in6_addr *ip6_addr,
uint8_t prefixlen, uint32_t lifetime_preferred,
uint32_t lifetime_valid) {
int r;
_cleanup_address_free_ Address *addr = NULL;
r = address_new_dynamic(&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 = prefixlen;
addr->cinfo.ifa_prefered = lifetime_preferred;
addr->cinfo.ifa_valid = lifetime_valid;
log_link_info(link,
"DHCPv6 address "SD_ICMP6_ND_ADDRESS_FORMAT_STR"/%d timeout preferred %d valid %d",
SD_ICMP6_ND_ADDRESS_FORMAT_VAL(addr->in_addr.in6),
addr->prefixlen, lifetime_preferred, lifetime_valid);
r = address_update(addr, link, dhcp6_address_handler);
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;
uint8_t prefixlen;
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 = sd_icmp6_ra_get_prefixlen(link->icmp6_router_discovery,
&ip6_addr, &prefixlen);
if (r < 0 && r != -EADDRNOTAVAIL) {
log_link_warning_errno(link, r, "Could not get prefix information: %m");
return r;
}
if (r == -EADDRNOTAVAIL)
prefixlen = 128;
r = dhcp6_address_update(link, &ip6_addr, prefixlen,
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);
assert(link->manager);
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:
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_client_handler(link);
}
static int dhcp6_configure(Link *link, int event) {
int r;
bool information_request;
assert_return(link, -EINVAL);
assert_return(IN_SET(event, SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_TIMEOUT,
SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_OTHER,
SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_MANAGED), -EINVAL);
link->dhcp6_configured = false;
if (link->dhcp6_client) {
r = sd_dhcp6_client_get_information_request(link->dhcp6_client,
&information_request);
if (r < 0) {
log_link_warning_errno(link, r, "Could not get DHCPv6 Information request setting: %m");
goto error;
}
if (information_request && event != SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_OTHER) {
r = sd_dhcp6_client_stop(link->dhcp6_client);
if (r < 0) {
log_link_warning_errno(link, r, "Could not stop DHCPv6 while setting Managed mode: %m");
goto error;
}
r = sd_dhcp6_client_set_information_request(link->dhcp6_client,
false);
if (r < 0) {
log_link_warning_errno(link, r, "Could not unset DHCPv6 Information request: %m");
goto error;
}
}
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0 && r != -EALREADY) {
log_link_warning_errno(link, r, "Could not restart DHCPv6: %m");
goto error;
}
if (r == -EALREADY)
link->dhcp6_configured = true;
return r;
}
r = sd_dhcp6_client_new(&link->dhcp6_client);
if (r < 0)
goto error;
r = sd_dhcp6_client_attach_event(link->dhcp6_client, NULL, 0);
if (r < 0)
goto error;
r = sd_dhcp6_client_set_mac(link->dhcp6_client,
(const uint8_t *) &link->mac,
sizeof (link->mac), ARPHRD_ETHER);
if (r < 0)
goto error;
r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex);
if (r < 0)
goto error;
r = sd_dhcp6_client_set_callback(link->dhcp6_client, dhcp6_handler,
link);
if (r < 0)
goto error;
if (event == SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_OTHER) {
r = sd_dhcp6_client_set_information_request(link->dhcp6_client,
true);
if (r < 0)
goto error;
}
r = sd_dhcp6_client_start(link->dhcp6_client);
if (r < 0)
goto error;
return r;
error:
link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
return r;
}
static int dhcp6_prefix_expired(Link *link) {
int r;
sd_dhcp6_lease *lease;
struct in6_addr *expired_prefix, ip6_addr;
uint8_t expired_prefixlen;
uint32_t lifetime_preferred, lifetime_valid;
r = sd_icmp6_ra_get_expired_prefix(link->icmp6_router_discovery,
&expired_prefix, &expired_prefixlen);
if (r < 0)
return r;
r = sd_dhcp6_client_get_lease(link->dhcp6_client, &lease);
if (r < 0)
return r;
log_link_info(link, "IPv6 prefix "SD_ICMP6_ND_ADDRESS_FORMAT_STR"/%d expired",
SD_ICMP6_ND_ADDRESS_FORMAT_VAL(*expired_prefix),
expired_prefixlen);
sd_dhcp6_lease_reset_address_iter(lease);
while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
&lifetime_preferred,
&lifetime_valid) >= 0) {
r = sd_icmp6_prefix_match(expired_prefix, expired_prefixlen,
&ip6_addr);
if (r < 0)
continue;
log_link_info(link, "IPv6 prefix length updated "SD_ICMP6_ND_ADDRESS_FORMAT_STR"/%d", SD_ICMP6_ND_ADDRESS_FORMAT_VAL(ip6_addr), 128);
dhcp6_address_update(link, &ip6_addr, 128, lifetime_preferred, lifetime_valid);
}
return 0;
}
static void icmp6_router_handler(sd_icmp6_nd *nd, int event, void *userdata) {
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 SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_NONE:
return;
case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_TIMEOUT:
case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_OTHER:
case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_MANAGED:
dhcp6_configure(link, event);
break;
case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_PREFIX_EXPIRED:
if (!link->rtnl_extended_attrs)
dhcp6_prefix_expired(link);
break;
default:
if (event < 0)
log_link_warning_errno(link, event, "ICMPv6 error: %m");
else
log_link_warning(link, "ICMPv6 unknown event: %d", event);
break;
}
}
int icmp6_configure(Link *link) {
int r;
assert_return(link, -EINVAL);
r = sd_icmp6_nd_new(&link->icmp6_router_discovery);
if (r < 0)
return r;
r = sd_icmp6_nd_attach_event(link->icmp6_router_discovery, NULL, 0);
if (r < 0)
return r;
r = sd_icmp6_nd_set_mac(link->icmp6_router_discovery, &link->mac);
if (r < 0)
return r;
r = sd_icmp6_nd_set_index(link->icmp6_router_discovery, link->ifindex);
if (r < 0)
return r;
r = sd_icmp6_nd_set_callback(link->icmp6_router_discovery,
icmp6_router_handler, link);
return r;
}