src/network/netdev/l2tp-tunnel.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <netinet/in.h>
   4 #include <linux/l2tp.h>
   5 #include <linux/genetlink.h>
   6
   7 #include "conf-parser.h"
   8 #include "hashmap.h"
   9 #include "l2tp-tunnel.h"
  10 #include "netlink-util.h"
  11 #include "networkd-address.h"
  12 #include "networkd-manager.h"
  13 #include "parse-util.h"
  14 #include "socket-util.h"
  15 #include "string-table.h"
  16 #include "string-util.h"
  17 #include "util.h"
  18
  19 static const char* const l2tp_l2spec_type_table[_NETDEV_L2TP_L2SPECTYPE_MAX] = {
  20         [NETDEV_L2TP_L2SPECTYPE_NONE]    = "none",
  21         [NETDEV_L2TP_L2SPECTYPE_DEFAULT] = "default",
  22 };
  23
  24 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_l2spec_type, L2tpL2specType);
  25
  26 static const char* const l2tp_encap_type_table[_NETDEV_L2TP_ENCAPTYPE_MAX] = {
  27         [NETDEV_L2TP_ENCAPTYPE_UDP] = "udp",
  28         [NETDEV_L2TP_ENCAPTYPE_IP]  = "ip",
  29 };
  30
  31 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_encap_type, L2tpEncapType);
  32 DEFINE_CONFIG_PARSE_ENUM(config_parse_l2tp_encap_type, l2tp_encap_type, L2tpEncapType, "Failed to parse L2TP Encapsulation Type");
  33
  34 static const char* const l2tp_local_address_type_table[_NETDEV_L2TP_LOCAL_ADDRESS_MAX] = {
  35          [NETDEV_L2TP_LOCAL_ADDRESS_AUTO]    = "auto",
  36          [NETDEV_L2TP_LOCAL_ADDRESS_STATIC]  = "static",
  37          [NETDEV_L2TP_LOCAL_ADDRESS_DYNAMIC] = "dynamic",
  38 };
  39
  40 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_local_address_type, L2tpLocalAddressType);
  41
  42 static L2tpSession* l2tp_session_free(L2tpSession *s) {
  43         if (!s)
  44                 return NULL;
  45
  46         if (s->tunnel && s->section)
  47                 ordered_hashmap_remove(s->tunnel->sessions_by_section, s->section);
  48
  49         config_section_free(s->section);
  50         free(s->name);
  51         return mfree(s);
  52 }
  53
  54 DEFINE_SECTION_CLEANUP_FUNCTIONS(L2tpSession, l2tp_session_free);
  55
  56 static int l2tp_session_new_static(L2tpTunnel *t, const char *filename, unsigned section_line, L2tpSession **ret) {
  57         _cleanup_(config_section_freep) ConfigSection *n = NULL;
  58         _cleanup_(l2tp_session_freep) L2tpSession *s = NULL;
  59         int r;
  60
  61         assert(t);
  62         assert(ret);
  63         assert(filename);
  64         assert(section_line > 0);
  65
  66         r = config_section_new(filename, section_line, &n);
  67         if (r < 0)
  68                 return r;
  69
  70         s = ordered_hashmap_get(t->sessions_by_section, n);
  71         if (s) {
  72                 *ret = TAKE_PTR(s);
  73                 return 0;
  74         }
  75
  76         s = new(L2tpSession, 1);
  77         if (!s)
  78                 return -ENOMEM;
  79
  80         *s = (L2tpSession) {
  81                 .l2tp_l2spec_type = NETDEV_L2TP_L2SPECTYPE_DEFAULT,
  82                 .tunnel = t,
  83                 .section = TAKE_PTR(n),
  84         };
  85
  86         r = ordered_hashmap_ensure_put(&t->sessions_by_section, &config_section_hash_ops, s->section, s);
  87         if (r < 0)
  88                 return r;
  89
  90         *ret = TAKE_PTR(s);
  91         return 0;
  92 }
  93
  94 static int netdev_l2tp_create_message_tunnel(NetDev *netdev, union in_addr_union *local_address, sd_netlink_message **ret) {
  95         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
  96         uint16_t encap_type;
  97         L2tpTunnel *t;
  98         int r;
  99
 100         assert(netdev);
 101         assert(local_address);
 102         assert_se(t = L2TP(netdev));
 103
 104         r = sd_genl_message_new(netdev->manager->genl, L2TP_GENL_NAME, L2TP_CMD_TUNNEL_CREATE, &m);
 105         if (r < 0)
 106                 return r;
 107
 108         r = sd_netlink_message_append_u32(m, L2TP_ATTR_CONN_ID, t->tunnel_id);
 109         if (r < 0)
 110                 return r;
 111
 112         r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_CONN_ID, t->peer_tunnel_id);
 113         if (r < 0)
 114                 return r;
 115
 116         r = sd_netlink_message_append_u8(m, L2TP_ATTR_PROTO_VERSION, 3);
 117         if (r < 0)
 118                 return r;
 119
 120         switch(t->l2tp_encap_type) {
 121         case NETDEV_L2TP_ENCAPTYPE_IP:
 122                 encap_type = L2TP_ENCAPTYPE_IP;
 123                 break;
 124         case NETDEV_L2TP_ENCAPTYPE_UDP:
 125         default:
 126                 encap_type = L2TP_ENCAPTYPE_UDP;
 127                 break;
 128         }
 129
 130         r = sd_netlink_message_append_u16(m, L2TP_ATTR_ENCAP_TYPE, encap_type);
 131         if (r < 0)
 132                 return r;
 133
 134         if (t->family == AF_INET) {
 135                 r = sd_netlink_message_append_in_addr(m, L2TP_ATTR_IP_SADDR, &local_address->in);
 136                 if (r < 0)
 137                         return r;
 138
 139                 r = sd_netlink_message_append_in_addr(m, L2TP_ATTR_IP_DADDR, &t->remote.in);
 140                 if (r < 0)
 141                         return r;
 142         } else {
 143                 r = sd_netlink_message_append_in6_addr(m, L2TP_ATTR_IP6_SADDR, &local_address->in6);
 144                 if (r < 0)
 145                         return r;
 146
 147                 r = sd_netlink_message_append_in6_addr(m, L2TP_ATTR_IP6_DADDR, &t->remote.in6);
 148                 if (r < 0)
 149                         return r;
 150         }
 151
 152         if (encap_type == L2TP_ENCAPTYPE_UDP) {
 153                 r = sd_netlink_message_append_u16(m, L2TP_ATTR_UDP_SPORT, t->l2tp_udp_sport);
 154                 if (r < 0)
 155                         return r;
 156
 157                 r = sd_netlink_message_append_u16(m, L2TP_ATTR_UDP_DPORT, t->l2tp_udp_dport);
 158                 if (r < 0)
 159                         return r;
 160
 161                 if (t->udp_csum) {
 162                         r = sd_netlink_message_append_u8(m, L2TP_ATTR_UDP_CSUM, t->udp_csum);
 163                         if (r < 0)
 164                                 return r;
 165                 }
 166
 167                 if (t->udp6_csum_tx) {
 168                         r = sd_netlink_message_append_flag(m, L2TP_ATTR_UDP_ZERO_CSUM6_TX);
 169                         if (r < 0)
 170                                 return r;
 171                 }
 172
 173                 if (t->udp6_csum_rx) {
 174                         r = sd_netlink_message_append_flag(m, L2TP_ATTR_UDP_ZERO_CSUM6_RX);
 175                         if (r < 0)
 176                                 return r;
 177                 }
 178         }
 179
 180         *ret = TAKE_PTR(m);
 181
 182         return 0;
 183 }
 184
 185 static int netdev_l2tp_create_message_session(NetDev *netdev, L2tpSession *session, sd_netlink_message **ret) {
 186         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 187         uint16_t l2_spec_len;
 188         uint8_t l2_spec_type;
 189         int r;
 190
 191         assert(netdev);
 192         assert(session);
 193         assert(session->tunnel);
 194
 195         r = sd_genl_message_new(netdev->manager->genl, L2TP_GENL_NAME, L2TP_CMD_SESSION_CREATE, &m);
 196         if (r < 0)
 197                 return r;
 198
 199         r = sd_netlink_message_append_u32(m, L2TP_ATTR_CONN_ID, session->tunnel->tunnel_id);
 200         if (r < 0)
 201                 return r;
 202
 203         r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_CONN_ID, session->tunnel->peer_tunnel_id);
 204         if (r < 0)
 205                 return r;
 206
 207         r = sd_netlink_message_append_u32(m, L2TP_ATTR_SESSION_ID, session->session_id);
 208         if (r < 0)
 209                 return r;
 210
 211         r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id);
 212         if (r < 0)
 213                 return r;
 214
 215         r = sd_netlink_message_append_u16(m, L2TP_ATTR_PW_TYPE, L2TP_PWTYPE_ETH);
 216         if (r < 0)
 217                 return r;
 218
 219         switch (session->l2tp_l2spec_type) {
 220         case NETDEV_L2TP_L2SPECTYPE_NONE:
 221                 l2_spec_type = L2TP_L2SPECTYPE_NONE;
 222                 l2_spec_len = 0;
 223                 break;
 224         case NETDEV_L2TP_L2SPECTYPE_DEFAULT:
 225         default:
 226                 l2_spec_type = L2TP_L2SPECTYPE_DEFAULT;
 227                 l2_spec_len = 4;
 228                 break;
 229         }
 230
 231         r = sd_netlink_message_append_u8(m, L2TP_ATTR_L2SPEC_TYPE, l2_spec_type);
 232         if (r < 0)
 233                 return r;
 234
 235         r = sd_netlink_message_append_u8(m, L2TP_ATTR_L2SPEC_LEN, l2_spec_len);
 236         if (r < 0)
 237                 return r;
 238
 239         r = sd_netlink_message_append_string(m, L2TP_ATTR_IFNAME, session->name);
 240         if (r < 0)
 241                 return r;
 242
 243         *ret = TAKE_PTR(m);
 244
 245         return 0;
 246 }
 247
 248 static int l2tp_acquire_local_address_one(L2tpTunnel *t, Address *a, union in_addr_union *ret) {
 249         if (a->family != t->family)
 250                 return -EINVAL;
 251
 252         if (in_addr_is_set(a->family, &a->in_addr_peer))
 253                 return -EINVAL;
 254
 255         if (t->local_address_type == NETDEV_L2TP_LOCAL_ADDRESS_STATIC &&
 256             !FLAGS_SET(a->flags, IFA_F_PERMANENT))
 257                 return -EINVAL;
 258
 259         if (t->local_address_type == NETDEV_L2TP_LOCAL_ADDRESS_DYNAMIC &&
 260             FLAGS_SET(a->flags, IFA_F_PERMANENT))
 261                 return -EINVAL;
 262
 263         *ret = a->in_addr;
 264         return 0;
 265 }
 266
 267 static int l2tp_acquire_local_address(L2tpTunnel *t, Link *link, union in_addr_union *ret) {
 268         Address *a;
 269
 270         assert(t);
 271         assert(link);
 272         assert(ret);
 273         assert(IN_SET(t->family, AF_INET, AF_INET6));
 274
 275         if (in_addr_is_set(t->family, &t->local)) {
 276                 /* local address is explicitly specified. */
 277                 *ret = t->local;
 278                 return 0;
 279         }
 280
 281         SET_FOREACH(a, link->addresses)
 282                 if (l2tp_acquire_local_address_one(t, a, ret) >= 0)
 283                         return 1;
 284
 285         return -ENODATA;
 286 }
 287
 288 static void l2tp_session_destroy_callback(L2tpSession *session) {
 289         if (!session)
 290                 return;
 291
 292         netdev_unref(NETDEV(session->tunnel));
 293 }
 294
 295 static int l2tp_create_session_handler(sd_netlink *rtnl, sd_netlink_message *m, L2tpSession *session) {
 296         NetDev *netdev;
 297         int r;
 298
 299         assert(session);
 300         assert(session->tunnel);
 301
 302         netdev = NETDEV(session->tunnel);
 303
 304         r = sd_netlink_message_get_errno(m);
 305         if (r == -EEXIST)
 306                 log_netdev_info(netdev, "L2TP session %s exists, using existing without changing its parameters",
 307                                 session->name);
 308         else if (r < 0) {
 309                 log_netdev_warning_errno(netdev, r, "L2TP session %s could not be created: %m", session->name);
 310                 return 1;
 311         }
 312
 313         log_netdev_debug(netdev, "L2TP session %s created", session->name);
 314         return 1;
 315 }
 316
 317 static int l2tp_create_session(NetDev *netdev, L2tpSession *session) {
 318         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *n = NULL;
 319         int r;
 320
 321         r = netdev_l2tp_create_message_session(netdev, session, &n);
 322         if (r < 0)
 323                 return log_netdev_error_errno(netdev, r, "Failed to create netlink message: %m");
 324
 325         r = netlink_call_async(netdev->manager->genl, NULL, n, l2tp_create_session_handler,
 326                                l2tp_session_destroy_callback, session);
 327         if (r < 0)
 328                 return log_netdev_error_errno(netdev, r, "Failed to create L2TP session %s: %m", session->name);
 329
 330         netdev_ref(netdev);
 331         return 0;
 332 }
 333
 334 static int l2tp_create_tunnel_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 335         L2tpSession *session;
 336         L2tpTunnel *t;
 337         int r;
 338
 339         assert(netdev);
 340         assert(netdev->state != _NETDEV_STATE_INVALID);
 341
 342         t = L2TP(netdev);
 343
 344         assert(t);
 345
 346         r = sd_netlink_message_get_errno(m);
 347         if (r == -EEXIST)
 348                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 349         else if (r < 0) {
 350                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 351                 netdev_enter_failed(netdev);
 352
 353                 return 1;
 354         }
 355
 356         log_netdev_debug(netdev, "L2TP tunnel is created");
 357
 358         ORDERED_HASHMAP_FOREACH(session, t->sessions_by_section)
 359                 (void) l2tp_create_session(netdev, session);
 360
 361         return 1;
 362 }
 363
 364 static int l2tp_create_tunnel(NetDev *netdev, Link *link) {
 365         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 366         union in_addr_union local_address;
 367         L2tpTunnel *t;
 368         int r;
 369
 370         assert(netdev);
 371         assert_se(t = L2TP(netdev));
 372
 373         r = l2tp_acquire_local_address(t, link, &local_address);
 374         if (r < 0)
 375                 return log_netdev_error_errno(netdev, r, "Could not find local address.");
 376
 377         if (r > 0 && DEBUG_LOGGING) {
 378                 _cleanup_free_ char *str = NULL;
 379
 380                 (void) in_addr_to_string(t->family, &local_address, &str);
 381                 log_netdev_debug(netdev, "Local address %s acquired.", strna(str));
 382         }
 383
 384         r = netdev_l2tp_create_message_tunnel(netdev, &local_address, &m);
 385         if (r < 0)
 386                 return log_netdev_error_errno(netdev, r, "Failed to create netlink message: %m");
 387
 388         r = netlink_call_async(netdev->manager->genl, NULL, m, l2tp_create_tunnel_handler,
 389                                netdev_destroy_callback, netdev);
 390         if (r < 0)
 391                 return log_netdev_error_errno(netdev, r, "Failed to create L2TP tunnel: %m");
 392
 393         netdev_ref(netdev);
 394
 395         return 0;
 396 }
 397
 398 int config_parse_l2tp_tunnel_address(
 399                 const char *unit,
 400                 const char *filename,
 401                 unsigned line,
 402                 const char *section,
 403                 unsigned section_line,
 404                 const char *lvalue,
 405                 int ltype,
 406                 const char *rvalue,
 407                 void *data,
 408                 void *userdata) {
 409
 410         L2tpTunnel *t = userdata;
 411         union in_addr_union *addr = data;
 412         int r;
 413
 414         assert(filename);
 415         assert(lvalue);
 416         assert(rvalue);
 417         assert(data);
 418
 419         if (streq(lvalue, "Local")) {
 420                 L2tpLocalAddressType addr_type;
 421
 422                 if (isempty(rvalue))
 423                         addr_type = NETDEV_L2TP_LOCAL_ADDRESS_AUTO;
 424                 else
 425                         addr_type = l2tp_local_address_type_from_string(rvalue);
 426
 427                 if (addr_type >= 0) {
 428                         if (!in_addr_is_set(t->family, &t->remote))
 429                                 /* If Remote= is not specified yet, then also clear family. */
 430                                 t->family = AF_UNSPEC;
 431
 432                         t->local = IN_ADDR_NULL;
 433                         t->local_address_type = addr_type;
 434
 435                         return 0;
 436                 }
 437         }
 438
 439         if (t->family == AF_UNSPEC)
 440                 r = in_addr_from_string_auto(rvalue, &t->family, addr);
 441         else
 442                 r = in_addr_from_string(t->family, rvalue, addr);
 443         if (r < 0) {
 444                 log_syntax(unit, LOG_WARNING, filename, line, r,
 445                            "Invalid L2TP Tunnel address specified in %s='%s', ignoring assignment: %m", lvalue, rvalue);
 446                 return 0;
 447         }
 448
 449         return 0;
 450 }
 451
 452 int config_parse_l2tp_tunnel_id(
 453                 const char *unit,
 454                 const char *filename,
 455                 unsigned line,
 456                 const char *section,
 457                 unsigned section_line,
 458                 const char *lvalue,
 459                 int ltype,
 460                 const char *rvalue,
 461                 void *data,
 462                 void *userdata) {
 463
 464         uint32_t *id = data, k;
 465         int r;
 466
 467         assert(filename);
 468         assert(lvalue);
 469         assert(rvalue);
 470         assert(data);
 471
 472         r = safe_atou32(rvalue, &k);
 473         if (r < 0) {
 474                 log_syntax(unit, LOG_WARNING, filename, line, r,
 475                            "Failed to parse L2TP tunnel id. Ignoring assignment: %s", rvalue);
 476                 return 0;
 477         }
 478
 479         if (k == 0) {
 480                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 481                            "Invalid L2TP tunnel id. Ignoring assignment: %s", rvalue);
 482                 return 0;
 483         }
 484
 485         *id = k;
 486
 487         return 0;
 488 }
 489
 490 int config_parse_l2tp_session_id(
 491                 const char *unit,
 492                 const char *filename,
 493                 unsigned line,
 494                 const char *section,
 495                 unsigned section_line,
 496                 const char *lvalue,
 497                 int ltype,
 498                 const char *rvalue,
 499                 void *data,
 500                 void *userdata) {
 501
 502         _cleanup_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
 503         L2tpTunnel *t = userdata;
 504         uint32_t k;
 505         int r;
 506
 507         assert(filename);
 508         assert(section);
 509         assert(lvalue);
 510         assert(rvalue);
 511         assert(data);
 512
 513         r = l2tp_session_new_static(t, filename, section_line, &session);
 514         if (r < 0)
 515                 return log_oom();
 516
 517         r = safe_atou32(rvalue, &k);
 518         if (r < 0) {
 519                 log_syntax(unit, LOG_WARNING, filename, line, r,
 520                            "Failed to parse L2TP session id. Ignoring assignment: %s", rvalue);
 521                 return 0;
 522         }
 523
 524         if (k == 0) {
 525                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 526                            "Invalid L2TP session id. Ignoring assignment: %s", rvalue);
 527                 return 0;
 528         }
 529
 530         if (streq(lvalue, "SessionId"))
 531                 session->session_id = k;
 532         else
 533                 session->peer_session_id = k;
 534
 535         session = NULL;
 536         return 0;
 537 }
 538
 539 int config_parse_l2tp_session_l2spec(
 540                 const char *unit,
 541                 const char *filename,
 542                 unsigned line,
 543                 const char *section,
 544                 unsigned section_line,
 545                 const char *lvalue,
 546                 int ltype,
 547                 const char *rvalue,
 548                 void *data,
 549                 void *userdata) {
 550
 551         _cleanup_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
 552         L2tpTunnel *t = userdata;
 553         L2tpL2specType spec;
 554         int r;
 555
 556         assert(filename);
 557         assert(section);
 558         assert(lvalue);
 559         assert(rvalue);
 560         assert(data);
 561
 562         r = l2tp_session_new_static(t, filename, section_line, &session);
 563         if (r < 0)
 564                 return log_oom();
 565
 566         spec = l2tp_l2spec_type_from_string(rvalue);
 567         if (spec < 0) {
 568                 log_syntax(unit, LOG_WARNING, filename, line, spec,
 569                            "Failed to parse layer2 specific header type. Ignoring assignment: %s", rvalue);
 570                 return 0;
 571         }
 572
 573         session->l2tp_l2spec_type = spec;
 574
 575         session = NULL;
 576         return 0;
 577 }
 578
 579 int config_parse_l2tp_session_name(
 580                 const char *unit,
 581                 const char *filename,
 582                 unsigned line,
 583                 const char *section,
 584                 unsigned section_line,
 585                 const char *lvalue,
 586                 int ltype,
 587                 const char *rvalue,
 588                 void *data,
 589                 void *userdata) {
 590
 591         _cleanup_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
 592         L2tpTunnel *t = userdata;
 593         int r;
 594
 595         assert(filename);
 596         assert(section);
 597         assert(lvalue);
 598         assert(rvalue);
 599         assert(data);
 600
 601         r = l2tp_session_new_static(t, filename, section_line, &session);
 602         if (r < 0)
 603                 return log_oom();
 604
 605         if (!ifname_valid(rvalue)) {
 606                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 607                            "Failed to parse L2TP tunnel session name. Ignoring assignment: %s", rvalue);
 608                 return 0;
 609         }
 610
 611         r = free_and_strdup(&session->name, rvalue);
 612         if (r < 0)
 613                 return log_oom();
 614
 615         session = NULL;
 616         return 0;
 617 }
 618
 619 static void l2tp_tunnel_init(NetDev *netdev) {
 620         L2tpTunnel *t;
 621
 622         assert(netdev);
 623
 624         t = L2TP(netdev);
 625
 626         assert(t);
 627
 628         t->l2tp_encap_type = NETDEV_L2TP_ENCAPTYPE_UDP;
 629         t->udp6_csum_rx = true;
 630         t->udp6_csum_tx = true;
 631 }
 632
 633 static int l2tp_session_verify(L2tpSession *session) {
 634         NetDev *netdev;
 635
 636         assert(session);
 637         assert(session->tunnel);
 638
 639         netdev = NETDEV(session->tunnel);
 640
 641         if (section_is_invalid(session->section))
 642                 return -EINVAL;
 643
 644         if (!session->name)
 645                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 646                                               "%s: L2TP session without name configured. "
 647                                               "Ignoring [L2TPSession] section from line %u",
 648                                               session->section->filename, session->section->line);
 649
 650         if (session->session_id == 0 || session->peer_session_id == 0)
 651                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 652                                               "%s: L2TP session without session IDs configured. "
 653                                               "Ignoring [L2TPSession] section from line %u",
 654                                               session->section->filename, session->section->line);
 655
 656         return 0;
 657 }
 658
 659 static int netdev_l2tp_tunnel_verify(NetDev *netdev, const char *filename) {
 660         L2tpTunnel *t;
 661         L2tpSession *session;
 662
 663         assert(netdev);
 664         assert(filename);
 665
 666         t = L2TP(netdev);
 667
 668         assert(t);
 669
 670         if (!IN_SET(t->family, AF_INET, AF_INET6))
 671                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 672                                               "%s: L2TP tunnel with invalid address family configured. Ignoring",
 673                                               filename);
 674
 675         if (!in_addr_is_set(t->family, &t->remote))
 676                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 677                                               "%s: L2TP tunnel without a remote address configured. Ignoring",
 678                                               filename);
 679
 680         if (t->tunnel_id == 0 || t->peer_tunnel_id == 0)
 681                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 682                                               "%s: L2TP tunnel without tunnel IDs configured. Ignoring",
 683                                               filename);
 684
 685         ORDERED_HASHMAP_FOREACH(session, t->sessions_by_section)
 686                 if (l2tp_session_verify(session) < 0)
 687                         l2tp_session_free(session);
 688
 689         return 0;
 690 }
 691
 692 static void l2tp_tunnel_done(NetDev *netdev) {
 693         L2tpTunnel *t;
 694
 695         assert(netdev);
 696
 697         t = L2TP(netdev);
 698
 699         assert(t);
 700
 701         ordered_hashmap_free_with_destructor(t->sessions_by_section, l2tp_session_free);
 702 }
 703
 704 const NetDevVTable l2tptnl_vtable = {
 705         .object_size = sizeof(L2tpTunnel),
 706         .init = l2tp_tunnel_init,
 707         .sections = NETDEV_COMMON_SECTIONS "L2TP\0L2TPSession\0",
 708         .create_after_configured = l2tp_create_tunnel,
 709         .done = l2tp_tunnel_done,
 710         .create_type = NETDEV_CREATE_AFTER_CONFIGURED,
 711         .config_verify = netdev_l2tp_tunnel_verify,
 712 };