src/network/networkd-dhcp6.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright (C) 2014 Intel Corporation. All rights reserved.
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <netinet/ether.h>
  23 #include <linux/if.h>
  24
  25 #include "networkd-link.h"
  26 #include "network-internal.h"
  27
  28 #include "sd-ndisc.h"
  29 #include "sd-dhcp6-client.h"
  30
  31 static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link);
  32
  33 static int dhcp6_lease_information_acquired(sd_dhcp6_client *client,
  34                                         Link *link) {
  35         return 0;
  36 }
  37
  38 static int dhcp6_address_handler(sd_netlink *rtnl, sd_netlink_message *m,
  39                                  void *userdata) {
  40         _cleanup_link_unref_ Link *link = userdata;
  41         int r;
  42
  43         assert(link);
  44
  45         r = sd_netlink_message_get_errno(m);
  46         if (r < 0 && r != -EEXIST) {
  47                 if (link->rtnl_extended_attrs) {
  48                         log_link_warning(link, "Could not set extended netlink attributes, reverting to fallback mechanism");
  49
  50                         link->rtnl_extended_attrs = false;
  51                         dhcp6_lease_address_acquired(link->dhcp6_client, link);
  52
  53                         return 1;
  54                 }
  55
  56                 log_link_error_errno(link, r, "Could not set DHCPv6 address: %m");
  57
  58                 link_enter_failed(link);
  59
  60         } else if (r >= 0)
  61                 manager_rtnl_process_address(rtnl, m, link->manager);
  62
  63         return 1;
  64 }
  65
  66 static int dhcp6_address_change(Link *link, struct in6_addr *ip6_addr,
  67                                 uint32_t lifetime_preferred, uint32_t lifetime_valid) {
  68         int r;
  69         _cleanup_address_free_ Address *addr = NULL;
  70
  71         r = address_new(&addr);
  72         if (r < 0)
  73                 return r;
  74
  75         addr->family = AF_INET6;
  76         memcpy(&addr->in_addr.in6, ip6_addr, sizeof(*ip6_addr));
  77
  78         addr->flags = IFA_F_NOPREFIXROUTE;
  79         addr->prefixlen = 128;
  80
  81         addr->cinfo.ifa_prefered = lifetime_preferred;
  82         addr->cinfo.ifa_valid = lifetime_valid;
  83
  84         log_link_info(link,
  85                       "DHCPv6 address "SD_NDISC_ADDRESS_FORMAT_STR"/%d timeout preferred %d valid %d",
  86                       SD_NDISC_ADDRESS_FORMAT_VAL(addr->in_addr.in6),
  87                       addr->prefixlen, lifetime_preferred, lifetime_valid);
  88
  89         r = address_configure(addr, link, dhcp6_address_handler, true);
  90         if (r < 0)
  91                 log_link_warning_errno(link, r, "Could not assign DHCPv6 address: %m");
  92
  93         return r;
  94 }
  95
  96 static int dhcp6_lease_address_acquired(sd_dhcp6_client *client, Link *link) {
  97         int r;
  98         sd_dhcp6_lease *lease;
  99         struct in6_addr ip6_addr;
 100         uint32_t lifetime_preferred, lifetime_valid;
 101
 102         r = sd_dhcp6_client_get_lease(client, &lease);
 103         if (r < 0)
 104                 return r;
 105
 106         sd_dhcp6_lease_reset_address_iter(lease);
 107
 108         while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
 109                                                 &lifetime_preferred,
 110                                                 &lifetime_valid) >= 0) {
 111
 112                 r = dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid);
 113                 if (r < 0)
 114                         return r;
 115         }
 116
 117         return 0;
 118 }
 119
 120 static void dhcp6_handler(sd_dhcp6_client *client, int event, void *userdata) {
 121         int r;
 122         Link *link = userdata;
 123
 124         assert(link);
 125         assert(link->network);
 126         assert(link->manager);
 127
 128         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 129                 return;
 130
 131         switch(event) {
 132         case SD_DHCP6_CLIENT_EVENT_STOP:
 133         case SD_DHCP6_CLIENT_EVENT_RESEND_EXPIRE:
 134         case SD_DHCP6_CLIENT_EVENT_RETRANS_MAX:
 135                 log_link_warning(link, "DHCPv6 lease lost");
 136
 137                 link->dhcp6_configured = false;
 138                 break;
 139
 140         case SD_DHCP6_CLIENT_EVENT_IP_ACQUIRE:
 141                 r = dhcp6_lease_address_acquired(client, link);
 142                 if (r < 0) {
 143                         link_enter_failed(link);
 144                         return;
 145                 }
 146
 147                 /* fall through */
 148         case SD_DHCP6_CLIENT_EVENT_INFORMATION_REQUEST:
 149                 r = dhcp6_lease_information_acquired(client, link);
 150                 if (r < 0) {
 151                         link_enter_failed(link);
 152                         return;
 153                 }
 154
 155                 link->dhcp6_configured = true;
 156                 break;
 157
 158         default:
 159                 if (event < 0)
 160                         log_link_warning_errno(link, event, "DHCPv6 error: %m");
 161                 else
 162                         log_link_warning(link, "DHCPv6 unknown event: %d", event);
 163                 return;
 164         }
 165
 166         link_check_ready(link);
 167 }
 168
 169 int dhcp6_configure(Link *link, bool inf_req) {
 170         int r;
 171         bool information_request;
 172
 173         assert_return(link, -EINVAL);
 174
 175         link->dhcp6_configured = false;
 176
 177         if (link->dhcp6_client) {
 178                 r = sd_dhcp6_client_get_information_request(link->dhcp6_client, &information_request);
 179                 if (r < 0) {
 180                         log_link_warning_errno(link, r, "Could not get DHCPv6 Information request setting: %m");
 181                         goto error;
 182                 }
 183
 184                 if (information_request && !inf_req) {
 185                         r = sd_dhcp6_client_stop(link->dhcp6_client);
 186                         if (r < 0) {
 187                                 log_link_warning_errno(link, r, "Could not stop DHCPv6 while setting Managed mode: %m");
 188                                 goto error;
 189                         }
 190
 191                         r = sd_dhcp6_client_set_information_request(link->dhcp6_client, false);
 192                         if (r < 0) {
 193                                 log_link_warning_errno(link, r, "Could not unset DHCPv6 Information request: %m");
 194                                 goto error;
 195                         }
 196
 197                 }
 198
 199                 r = sd_dhcp6_client_start(link->dhcp6_client);
 200                 if (r < 0 && r != -EALREADY) {
 201                         log_link_warning_errno(link, r, "Could not restart DHCPv6: %m");
 202                         goto error;
 203                 }
 204
 205                 if (r == -EALREADY)
 206                         link->dhcp6_configured = true;
 207
 208                 return r;
 209         }
 210
 211         r = sd_dhcp6_client_new(&link->dhcp6_client);
 212         if (r < 0)
 213                 goto error;
 214
 215         r = sd_dhcp6_client_attach_event(link->dhcp6_client, NULL, 0);
 216         if (r < 0)
 217                 goto error;
 218
 219         r = sd_dhcp6_client_set_mac(link->dhcp6_client,
 220                                     (const uint8_t *) &link->mac,
 221                                     sizeof (link->mac), ARPHRD_ETHER);
 222         if (r < 0)
 223                 goto error;
 224
 225         r = sd_dhcp6_client_set_index(link->dhcp6_client, link->ifindex);
 226         if (r < 0)
 227                 goto error;
 228
 229         r = sd_dhcp6_client_set_callback(link->dhcp6_client, dhcp6_handler,
 230                                          link);
 231         if (r < 0)
 232                 goto error;
 233
 234         if (inf_req) {
 235                 r = sd_dhcp6_client_set_information_request(link->dhcp6_client, true);
 236                 if (r < 0)
 237                         goto error;
 238         }
 239
 240         r = sd_dhcp6_client_start(link->dhcp6_client);
 241         if (r < 0)
 242                 goto error;
 243
 244         return r;
 245
 246  error:
 247         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 248         return r;
 249 }
 250
 251 int dhcp6_prefix_expired(Link *link) {
 252         int r;
 253         sd_dhcp6_lease *lease;
 254         struct in6_addr *expired_prefix, ip6_addr;
 255         uint8_t expired_prefixlen;
 256         uint32_t lifetime_preferred, lifetime_valid;
 257
 258         r = sd_ndisc_get_expired_prefix(link->ndisc_router_discovery,
 259                                         &expired_prefix, &expired_prefixlen);
 260         if (r < 0)
 261                 return r;
 262
 263         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &lease);
 264         if (r < 0)
 265                 return r;
 266
 267         log_link_info(link, "IPv6 prefix "SD_NDISC_ADDRESS_FORMAT_STR"/%d expired",
 268                       SD_NDISC_ADDRESS_FORMAT_VAL(*expired_prefix),
 269                       expired_prefixlen);
 270
 271         sd_dhcp6_lease_reset_address_iter(lease);
 272
 273         while (sd_dhcp6_lease_get_address(lease, &ip6_addr,
 274                                                 &lifetime_preferred,
 275                                                 &lifetime_valid) >= 0) {
 276
 277                 r = sd_ndisc_prefix_match(expired_prefix, expired_prefixlen,
 278                                         &ip6_addr);
 279                 if (r < 0)
 280                         continue;
 281
 282                 log_link_info(link, "IPv6 prefix length updated "SD_NDISC_ADDRESS_FORMAT_STR"/%d", SD_NDISC_ADDRESS_FORMAT_VAL(ip6_addr), 128);
 283
 284                 dhcp6_address_change(link, &ip6_addr, lifetime_preferred, lifetime_valid);
 285         }
 286
 287         return 0;
 288 }