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-link.h"
  27 #include "networkd-manager.h"
  28
  29 static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link);
  30
  31 static int dhcp6_lease_information_acquired(sd_dhcp6_client *client,
  32                                         Link *link) {
  33         return 0;
  34 }
  35
  36 static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
  37                                  void *userdata) {
  38         _cleanup_link_unref_ Link *link = userdata;
  39         int r;
  40
  41         assert(link);
  42
  43         r = sd_netlink_message_get_errno(m);
  44         if (r < 0 && r != -EEXIST) {
  45                 if (link->rtnl_extended_attrs) {
  46                         log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism");
  47
  48                         link->rtnl_extended_attrs = false;
  49                         dhcp6_lease_address_acquired(link->dhcp6_client, link);
  50
  51                         return 1;
  52                 }
  53
  54                 log_link_error_errno(link, r, "Could not set DHCPv6 address: %m");
  55
  56                 link_enter_failed(link);
  57
  58         } else if (r >= 0)
  59                 manager_rtnl_process_address(rtnl, m, link->manager);
  60
  61         return 1;
  62 }
  63
  64 static int dhcp6_address_change(
  65                 Link *link,
  66                 struct in6_addr *ip6_addr,
  67                 uint32_t lifetime_preferred,
  68                 uint32_t lifetime_valid) {
  69
  70         _cleanup_address_free_ Address *addr = NULL;
  71         char buffer[INET6_ADDRSTRLEN];
  72         int r;
  73
  74         r = address_new(&addr);
  75         if (r < 0)
  76                 return r;
  77
  78         addr->family = AF_INET6;
  79         memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr));
  80
  81         addr->flags = IFA_F_NOPREFIXROUTE;
  82         addr->prefixlen = 128;
  83
  84         addr->cinfo.ifa_prefered = lifetime_preferred;
  85         addr->cinfo.ifa_valid = lifetime_valid;
  86
  87         log_link_info(link,
  88                       "DHCPv6 address %s/%d timeout preferred %d valid %d",
  89                       inet_ntop(AF_INET6, &addr->in_addr.in6, buffer, sizeof(buffer)),
  90                       addr->prefixlen, lifetime_preferred, lifetime_valid);
  91
  92         r = address_configure(addr, link, dhcp6_address_handler, true);
  93         if (r < 0)
  94                 log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m");
  95
  96         return r;
  97 }
  98
  99 static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) {
 100         int r;
 101         sd_dhcp6_lease *lease;
 102         struct in6_addr ip6_addr;
 103         uint32_t lifetime_preferred, lifetime_valid;
 104
 105         r = sd_dhcp6_client_get_lease(client, &lease);
 106         if (r < 0)
 107                 return r;
 108
 109         sd_dhcp6_lease_reset_address_iter(lease);
 110
 111         while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
 112                                                  &lifetime_preferred,
 113                                                  &lifetime_valid) >= 0) {
 114
 115                 r = dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid);
 116                 if (r < 0)
 117                         return r;
 118         }
 119
 120         return 0;
 121 }
 122
 123 static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
 124         int r;
 125         Link *link = userdata;
 126
 127         assert(link);
 128         assert(link->network);
 129
 130         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 131                 return;
 132
 133         switch(event) {
 134         case SD_DHCP6_CLIENT_EVENT_STOP:
 135         case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
 136         case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
 137                 if (sd_dhcp6_client_get_lease(client, NULL) >= 0)
 138                         log_link_warning(link, "DHCPv6 lease lost");
 139
 140                 link->dhcp6_configured = false;
 141                 break;
 142
 143         case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
 144                 r = dhcp6_lease_address_acquired(client, link);
 145                 if (r < 0) {
 146                         link_enter_failed(link);
 147                         return;
 148                 }
 149
 150                 /* fall through */
 151         case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
 152                 r = dhcp6_lease_information_acquired(client, link);
 153                 if (r < 0) {
 154                         link_enter_failed(link);
 155                         return;
 156                 }
 157
 158                 link->dhcp6_configured = true;
 159                 break;
 160
 161         default:
 162                 if (event < 0)
 163                         log_link_warning_errno(link, event, "DHCPv6 error: %m");
 164                 else
 165                         log_link_warning(link, "DHCPv6 unknown event: %d", event);
 166                 return;
 167         }
 168
 169         link_check_ready(link);
 170 }
 171
 172 int dhcp6_request_address(Link *link, int ir) {
 173         int r, inf_req;
 174         bool running;
 175
 176         assert(link);
 177         assert(link->dhcp6_client);
 178         assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
 179
 180         r = sd_dhcp6_client_is_running(link->dhcp6_client);
 181         if (r < 0)
 182                 return r;
 183         else
 184                 running = !!r;
 185
 186         if (running) {
 187                 r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &inf_req);
 188                 if (r < 0)
 189                         return r;
 190
 191                 if (inf_req == ir)
 192                         return 0;
 193
 194                 r = sd_dhcp6_client_stop(link->dhcp6_client);
 195                 if (r < 0)
 196                         return r;
 197         } else {
 198                 r = sd_dhcp6_client_set_local_address(link->dhcp6_client, &link->ipv6ll_address);
 199                 if (r < 0)
 200                         return r;
 201         }
 202
 203         r = sd_dhcp6_client_set_information_request(link->dhcp6_client, ir);
 204         if (r < 0)
 205                 return r;
 206
 207         r = sd_dhcp6_client_start(link->dhcp6_client);
 208         if (r < 0)
 209                 return r;
 210
 211         return 0;
 212 }
 213
 214 int dhcp6_configure(Link *link) {
 215         sd_dhcp6_client *client = NULL;
 216         int r;
 217         const DUID *duid;
 218
 219         assert(link);
 220
 221         if (link->dhcp6_client)
 222                 return 0;
 223
 224         r = sd_dhcp6_client_new(&client);
 225         if (r < 0)
 226                 return r;
 227
 228         r = sd_dhcp6_client_attach_event(client, NULL, 0);
 229         if (r < 0)
 230                 goto error;
 231
 232         r = sd_dhcp6_client_set_mac(client,
 233                                     (const uint8_t *) &link->mac,
 234                                     sizeof (link->mac), ARPHRD_ETHER);
 235         if (r < 0)
 236                 goto error;
 237
 238         r = sd_dhcp6_client_set_iaid(client, link->network->iaid);
 239         if (r < 0)
 240                 goto error;
 241
 242         duid = link_duid(link);
 243         r = sd_dhcp6_client_set_duid(client,
 244                                      duid->type,
 245                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
 246                                      duid->raw_data_len);
 247         if (r < 0)
 248                 goto error;
 249
 250         r = sd_dhcp6_client_set_ifindex(client, link->ifindex);
 251         if (r < 0)
 252                 goto error;
 253
 254         r = sd_dhcp6_client_set_callback(client, dhcp6_handler, link);
 255         if (r < 0)
 256                 goto error;
 257
 258         link->dhcp6_client = client;
 259
 260         return 0;
 261
 262 error:
 263         sd_dhcp6_client_unref(client);
 264         return r;
 265 }