373 lines
12 KiB
C
373 lines
12 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright (C) 2014 Intel Corporation. All rights reserved.
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <netinet/ether.h>
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#include <linux/if.h>
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#include "networkd-link.h"
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#include "network-internal.h"
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#include "sd-icmp6-nd.h"
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#include "sd-dhcp6-client.h"
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static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link);
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static int dhcp6_lease_information_acquired(sd_dhcp6_client *client,
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Link *link) {
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return 0;
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}
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static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
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void *userdata) {
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_cleanup_link_unref_ Link *link = userdata;
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int r;
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assert(link);
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r = sd_netlink_message_get_errno(m);
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if (r < 0 && r != -EEXIST) {
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if (link->rtnl_extended_attrs) {
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log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism");
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link->rtnl_extended_attrs = false;
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dhcp6_lease_address_acquired(link->dhcp6_client, link);
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return 1;
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}
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log_link_error_errno(link, r, "Could not set DHCPv6 address: %m");
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link_enter_failed(link);
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} else if (r >= 0)
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link_rtnl_process_address(rtnl, m, link->manager);
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return 1;
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}
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static int dhcp6_address_update(Link *link, struct in6_addr *ip6_addr,
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uint8_t prefixlen, uint32_t lifetime_preferred,
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uint32_t lifetime_valid) {
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int r;
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_cleanup_address_free_ Address *addr = NULL;
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r = address_new(&addr);
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if (r < 0)
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return r;
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addr->family = AF_INET6;
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memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr));
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addr->flags = IFA_F_NOPREFIXROUTE;
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addr->prefixlen = prefixlen;
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addr->cinfo.ifa_prefered = lifetime_preferred;
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addr->cinfo.ifa_valid = lifetime_valid;
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log_link_info(link,
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"DHCPv6 address "SD_ICMP6_ND_ADDRESS_FORMAT_STR"/%d timeout preferred %d valid %d",
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SD_ICMP6_ND_ADDRESS_FORMAT_VAL(addr->in_addr.in6),
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addr->prefixlen, lifetime_preferred, lifetime_valid);
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r = address_update(addr, link, dhcp6_address_handler);
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if (r < 0)
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log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m");
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return r;
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}
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static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) {
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int r;
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sd_dhcp6_lease *lease;
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struct in6_addr ip6_addr;
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uint32_t lifetime_preferred, lifetime_valid;
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uint8_t prefixlen;
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r = sd_dhcp6_client_get_lease(client, &lease);
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if (r < 0)
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return r;
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sd_dhcp6_lease_reset_address_iter(lease);
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while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
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&lifetime_preferred,
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&lifetime_valid) >= 0) {
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r = sd_icmp6_ra_get_prefixlen(link->icmp6_router_discovery,
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&ip6_addr, &prefixlen);
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if (r < 0 && r != -EADDRNOTAVAIL) {
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log_link_warning_errno(link, r, "Could not get prefix information: %m");
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return r;
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}
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if (r == -EADDRNOTAVAIL)
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prefixlen = 128;
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r = dhcp6_address_update(link, &ip6_addr, prefixlen,
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lifetime_preferred, lifetime_valid);
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if (r < 0)
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return r;
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}
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return 0;
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}
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static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
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int r;
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Link *link = userdata;
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assert(link);
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assert(link->network);
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assert(link->manager);
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return;
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switch(event) {
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case SD_DHCP6_CLIENT_EVENT_STOP:
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case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
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case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
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log_link_warning(link, "DHCPv6 lease lost");
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link->dhcp6_configured = false;
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break;
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case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
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r = dhcp6_lease_address_acquired(client, link);
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if (r < 0) {
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link_enter_failed(link);
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return;
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}
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/* fall through */
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case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
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r = dhcp6_lease_information_acquired(client, link);
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if (r < 0) {
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link_enter_failed(link);
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return;
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}
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link->dhcp6_configured = true;
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break;
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default:
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if (event < 0)
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log_link_warning_errno(link, event, "DHCPv6 error: %m");
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else
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log_link_warning(link, "DHCPv6 unknown event: %d", event);
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return;
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}
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link_client_handler(link);
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}
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static int dhcp6_configure(Link *link, int event) {
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int r;
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bool information_request;
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assert_return(link, -EINVAL);
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assert_return(IN_SET(event, SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_TIMEOUT,
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SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_OTHER,
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SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_MANAGED), -EINVAL);
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link->dhcp6_configured = false;
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if (link->dhcp6_client) {
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r = sd_dhcp6_client_get_information_request(link->dhcp6_client,
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&information_request);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not get DHCPv6 Information request setting: %m");
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goto error;
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}
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if (information_request && event != SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_OTHER) {
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r = sd_dhcp6_client_stop(link->dhcp6_client);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not stop DHCPv6 while setting Managed mode: %m");
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goto error;
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}
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r = sd_dhcp6_client_set_information_request(link->dhcp6_client,
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false);
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if (r < 0) {
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log_link_warning_errno(link, r, "Could not unset DHCPv6 Information request: %m");
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goto error;
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}
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}
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r = sd_dhcp6_client_start(link->dhcp6_client);
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if (r < 0 && r != -EALREADY) {
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log_link_warning_errno(link, r, "Could not restart DHCPv6: %m");
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goto error;
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}
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if (r == -EALREADY)
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link->dhcp6_configured = true;
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return r;
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}
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r = sd_dhcp6_client_new(&link->dhcp6_client);
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if (r < 0)
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goto error;
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r = sd_dhcp6_client_attach_event(link->dhcp6_client, NULL, 0);
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if (r < 0)
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goto error;
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r = sd_dhcp6_client_set_mac(link->dhcp6_client,
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(const uint8_t *) &link->mac,
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sizeof (link->mac), ARPHRD_ETHER);
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if (r < 0)
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goto error;
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r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex);
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if (r < 0)
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goto error;
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r = sd_dhcp6_client_set_callback(link->dhcp6_client, dhcp6_handler,
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link);
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if (r < 0)
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goto error;
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if (event == SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_OTHER) {
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r = sd_dhcp6_client_set_information_request(link->dhcp6_client,
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true);
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if (r < 0)
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goto error;
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}
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r = sd_dhcp6_client_start(link->dhcp6_client);
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if (r < 0)
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goto error;
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return r;
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error:
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link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
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return r;
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}
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static int dhcp6_prefix_expired(Link *link) {
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int r;
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sd_dhcp6_lease *lease;
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struct in6_addr *expired_prefix, ip6_addr;
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uint8_t expired_prefixlen;
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uint32_t lifetime_preferred, lifetime_valid;
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r = sd_icmp6_ra_get_expired_prefix(link->icmp6_router_discovery,
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&expired_prefix, &expired_prefixlen);
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if (r < 0)
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return r;
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r = sd_dhcp6_client_get_lease(link->dhcp6_client, &lease);
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if (r < 0)
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return r;
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log_link_info(link, "IPv6 prefix "SD_ICMP6_ND_ADDRESS_FORMAT_STR"/%d expired",
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SD_ICMP6_ND_ADDRESS_FORMAT_VAL(*expired_prefix),
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expired_prefixlen);
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sd_dhcp6_lease_reset_address_iter(lease);
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while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
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&lifetime_preferred,
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&lifetime_valid) >= 0) {
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r = sd_icmp6_prefix_match(expired_prefix, expired_prefixlen,
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&ip6_addr);
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if (r < 0)
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continue;
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log_link_info(link, "IPv6 prefix length updated "SD_ICMP6_ND_ADDRESS_FORMAT_STR"/%d", SD_ICMP6_ND_ADDRESS_FORMAT_VAL(ip6_addr), 128);
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dhcp6_address_update(link, &ip6_addr, 128, lifetime_preferred, lifetime_valid);
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}
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return 0;
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}
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static void icmp6_router_handler(sd_icmp6_nd *nd, int event, void *userdata) {
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Link *link = userdata;
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assert(link);
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assert(link->network);
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assert(link->manager);
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if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
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return;
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switch(event) {
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case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_NONE:
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return;
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case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_TIMEOUT:
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case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_OTHER:
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case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_MANAGED:
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dhcp6_configure(link, event);
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break;
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case SD_ICMP6_ND_EVENT_ROUTER_ADVERTISMENT_PREFIX_EXPIRED:
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if (!link->rtnl_extended_attrs)
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dhcp6_prefix_expired(link);
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break;
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default:
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if (event < 0)
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log_link_warning_errno(link, event, "ICMPv6 error: %m");
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else
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log_link_warning(link, "ICMPv6 unknown event: %d", event);
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break;
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}
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}
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int icmp6_configure(Link *link) {
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int r;
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assert_return(link, -EINVAL);
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r = sd_icmp6_nd_new(&link->icmp6_router_discovery);
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if (r < 0)
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return r;
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r = sd_icmp6_nd_attach_event(link->icmp6_router_discovery, NULL, 0);
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if (r < 0)
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return r;
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r = sd_icmp6_nd_set_mac(link->icmp6_router_discovery, &link->mac);
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if (r < 0)
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return r;
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r = sd_icmp6_nd_set_index(link->icmp6_router_discovery, link->ifindex);
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if (r < 0)
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return r;
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r = sd_icmp6_nd_set_callback(link->icmp6_router_discovery,
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icmp6_router_handler, link);
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return r;
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}
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