src/network/networkd-dhcp6.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright (C) 2014 Intel Corporation. All rights reserved.
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <netinet/ether.h>
  21 #include <linux/if.h>
  22
  23 #include "sd-dhcp6-client.h"
  24
  25 #include "network-internal.h"
  26 #include "networkd.h"
  27
  28 static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link);
  29
  30 static int dhcp6_lease_information_acquired(sd_dhcp6_client *client,
  31                                         Link *link) {
  32         return 0;
  33 }
  34
  35 static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
  36                                  void *userdata) {
  37         _cleanup_link_unref_ Link *link = userdata;
  38         int r;
  39
  40         assert(link);
  41
  42         r = sd_netlink_message_get_errno(m);
  43         if (r < 0 && r != -EEXIST) {
  44                 if (link->rtnl_extended_attrs) {
  45                         log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism");
  46
  47                         link->rtnl_extended_attrs = false;
  48                         dhcp6_lease_address_acquired(link->dhcp6_client, link);
  49
  50                         return 1;
  51                 }
  52
  53                 log_link_error_errno(link, r, "Could not set DHCPv6 address: %m");
  54
  55                 link_enter_failed(link);
  56
  57         } else if (r >= 0)
  58                 manager_rtnl_process_address(rtnl, m, link->manager);
  59
  60         return 1;
  61 }
  62
  63 static int dhcp6_address_change(Link *link, struct in6_addr *ip6_addr,
  64                                 uint32_t lifetime_preferred, uint32_t lifetime_valid) {
  65         int r;
  66         _cleanup_address_free_ Address *addr = NULL;
  67
  68         r = address_new(&addr);
  69         if (r < 0)
  70                 return r;
  71
  72         addr->family = AF_INET6;
  73         memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr));
  74
  75         addr->flags = IFA_F_NOPREFIXROUTE;
  76         addr->prefixlen = 128;
  77
  78         addr->cinfo.ifa_prefered = lifetime_preferred;
  79         addr->cinfo.ifa_valid = lifetime_valid;
  80
  81         log_link_info(link,
  82                       "DHCPv6 address "SD_NDISC_ADDRESS_FORMAT_STR"/%d timeout preferred %d valid %d",
  83                       SD_NDISC_ADDRESS_FORMAT_VAL(addr->in_addr.in6),
  84                       addr->prefixlen, lifetime_preferred, lifetime_valid);
  85
  86         r = address_configure(addr, link, dhcp6_address_handler, true);
  87         if (r < 0)
  88                 log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m");
  89
  90         return r;
  91 }
  92
  93 static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) {
  94         int r;
  95         sd_dhcp6_lease *lease;
  96         struct in6_addr ip6_addr;
  97         uint32_t lifetime_preferred, lifetime_valid;
  98
  99         r = sd_dhcp6_client_get_lease(client, &lease);
 100         if (r < 0)
 101                 return r;
 102
 103         sd_dhcp6_lease_reset_address_iter(lease);
 104
 105         while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
 106                                                 &lifetime_preferred,
 107                                                 &lifetime_valid) >= 0) {
 108
 109                 r = dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid);
 110                 if (r < 0)
 111                         return r;
 112         }
 113
 114         return 0;
 115 }
 116
 117 static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
 118         int r;
 119         Link *link = userdata;
 120
 121         assert(link);
 122         assert(link->network);
 123         assert(link->manager);
 124
 125         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 126                 return;
 127
 128         switch(event) {
 129         case SD_DHCP6_CLIENT_EVENT_STOP:
 130         case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
 131         case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
 132                 if (sd_dhcp6_client_get_lease(client, NULL) >= 0)
 133                         log_link_warning(link, "DHCPv6 lease lost");
 134
 135                 link->dhcp6_configured = false;
 136                 break;
 137
 138         case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
 139                 r = dhcp6_lease_address_acquired(client, link);
 140                 if (r < 0) {
 141                         link_enter_failed(link);
 142                         return;
 143                 }
 144
 145                 /* fall through */
 146         case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
 147                 r = dhcp6_lease_information_acquired(client, link);
 148                 if (r < 0) {
 149                         link_enter_failed(link);
 150                         return;
 151                 }
 152
 153                 link->dhcp6_configured = true;
 154                 break;
 155
 156         default:
 157                 if (event < 0)
 158                         log_link_warning_errno(link, event, "DHCPv6 error: %m");
 159                 else
 160                         log_link_warning(link, "DHCPv6 unknown event: %d", event);
 161                 return;
 162         }
 163
 164         link_check_ready(link);
 165 }
 166
 167 int dhcp6_request_address(Link *link) {
 168         int r, inf_req;
 169         bool running;
 170
 171         assert(link);
 172         assert(link->dhcp6_client);
 173
 174         r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req);
 175         if (r < 0)
 176                 return r;
 177
 178         if (!inf_req)
 179                 return 0;
 180
 181         r = sd_dhcp6_client_is_running(link->dhcp6_client);
 182         if (r < 0)
 183                 return r;
 184         else
 185                 running = !!r;
 186
 187         if (running) {
 188                 r = sd_dhcp6_client_stop(link->dhcp6_client);
 189                 if (r < 0)
 190                         return r;
 191         }
 192
 193         r = sd_dhcp6_client_set_information_request(link->dhcp6_client, false);
 194         if (r < 0)
 195                 return r;
 196
 197         if (running) {
 198                 r = sd_dhcp6_client_start(link->dhcp6_client);
 199                 if (r < 0)
 200                         return r;
 201         }
 202
 203         return 0;
 204 }
 205
 206 int dhcp6_configure(Link *link) {
 207         sd_dhcp6_client *client = NULL;
 208         int r;
 209         const DUID *duid;
 210
 211         assert(link);
 212
 213         if (link->dhcp6_client)
 214                 return 0;
 215
 216         r = sd_dhcp6_client_new(&client);
 217         if (r < 0)
 218                 return r;
 219
 220         r = sd_dhcp6_client_attach_event(client, NULL, 0);
 221         if (r < 0)
 222                 goto error;
 223
 224         r = sd_dhcp6_client_set_information_request(client, true);
 225         if (r < 0)
 226                 goto error;
 227
 228         r = sd_dhcp6_client_set_mac(client,
 229                                     (const uint8_t *) &link->mac,
 230                                     sizeof (link->mac), ARPHRD_ETHER);
 231         if (r < 0)
 232                 goto error;
 233
 234         r = sd_dhcp6_client_set_iaid(client, link->network->iaid);
 235         if (r < 0)
 236                 goto error;
 237
 238         duid = link_duid(link);
 239         r = sd_dhcp6_client_set_duid(client,
 240                                      duid->type,
 241                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
 242                                      duid->raw_data_len);
 243         if (r < 0)
 244                 goto error;
 245
 246         r = sd_dhcp6_client_set_index(client, link->ifindex);
 247         if (r < 0)
 248                 goto error;
 249
 250         r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link);
 251         if (r < 0)
 252                 goto error;
 253
 254         link->dhcp6_client = client;
 255
 256         return 0;
 257
 258 error:
 259         sd_dhcp6_client_unref(client);
 260         return r;
 261 }