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3ad0c5d8a4
systemd/src/network/networkd-dhcp6.c
Tom Gundersen 3ad0c5d8a4 sd-icmp6-nd: rename files to sd-ndisc 
The actual code rename will follow. The reason for the change of name is to make it
simpler and more uniform with how we name other libraries (we don't include the
underlying protocol). The new name also matches the naming in the kernel (which
is particularly relevent here as we expect to let the kernel do some parts of
the protocol and we do others).
2015-10-22 17:19:54 +02:00

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/*-*- 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-ndisc.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)
manager_rtnl_process_address(rtnl, m, link->manager);
return 1;
}
static int dhcp6_address_change(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(&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_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;
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_change(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_check_ready(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_change(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;
}
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