src/network/netdev/l2tp-tunnel.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/in.h>
   4 #include <linux/l2tp.h>
   5 #include <linux/genetlink.h>
   6
   7 #include "sd-netlink.h"
   8
   9 #include "conf-parser.h"
  10 #include "hashmap.h"
  11 #include "l2tp-tunnel.h"
  12 #include "missing.h"
  13 #include "netlink-util.h"
  14 #include "networkd-address.h"
  15 #include "networkd-manager.h"
  16 #include "parse-util.h"
  17 #include "socket-util.h"
  18 #include "string-table.h"
  19 #include "string-util.h"
  20 #include "util.h"
  21
  22 static const char* const l2tp_l2spec_type_table[_NETDEV_L2TP_L2SPECTYPE_MAX] = {
  23         [NETDEV_L2TP_L2SPECTYPE_NONE]    = "none",
  24         [NETDEV_L2TP_L2SPECTYPE_DEFAULT] = "default",
  25 };
  26
  27 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_l2spec_type, L2tpL2specType);
  28
  29 static const char* const l2tp_encap_type_table[_NETDEV_L2TP_ENCAPTYPE_MAX] = {
  30         [NETDEV_L2TP_ENCAPTYPE_UDP] = "udp",
  31         [NETDEV_L2TP_ENCAPTYPE_IP]  = "ip",
  32 };
  33
  34 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_encap_type, L2tpEncapType);
  35 DEFINE_CONFIG_PARSE_ENUM(config_parse_l2tp_encap_type, l2tp_encap_type, L2tpEncapType, "Failed to parse L2TP Encapsulation Type");
  36
  37 static const char* const l2tp_local_address_type_table[_NETDEV_L2TP_LOCAL_ADDRESS_MAX] = {
  38          [NETDEV_L2TP_LOCAL_ADDRESS_AUTO]    = "auto",
  39          [NETDEV_L2TP_LOCAL_ADDRESS_STATIC]  = "static",
  40          [NETDEV_L2TP_LOCAL_ADDRESS_DYNAMIC] = "dynamic",
  41 };
  42
  43 DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(l2tp_local_address_type, L2tpLocalAddressType);
  44
  45 static void l2tp_session_free(L2tpSession *s) {
  46         if (!s)
  47                 return;
  48
  49         if (s->tunnel && s->section)
  50                 ordered_hashmap_remove(s->tunnel->sessions_by_section, s);
  51
  52         network_config_section_free(s->section);
  53
  54         free(s->name);
  55
  56         free(s);
  57 }
  58
  59 DEFINE_NETWORK_SECTION_FUNCTIONS(L2tpSession, l2tp_session_free);
  60
  61 static int l2tp_session_new_static(L2tpTunnel *t, const char *filename, unsigned section_line, L2tpSession **ret) {
  62         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  63         _cleanup_(l2tp_session_freep) L2tpSession *s = NULL;
  64         int r;
  65
  66         assert(t);
  67         assert(ret);
  68         assert(filename);
  69         assert(section_line > 0);
  70
  71         r = network_config_section_new(filename, section_line, &n);
  72         if (r < 0)
  73                 return r;
  74
  75         s = ordered_hashmap_get(t->sessions_by_section, n);
  76         if (s) {
  77                 *ret = TAKE_PTR(s);
  78                 return 0;
  79         }
  80
  81         s = new(L2tpSession, 1);
  82         if (!s)
  83                 return -ENOMEM;
  84
  85         *s = (L2tpSession) {
  86                 .l2tp_l2spec_type = NETDEV_L2TP_L2SPECTYPE_DEFAULT,
  87                 .tunnel = t,
  88                 .section = TAKE_PTR(n),
  89         };
  90
  91         r = ordered_hashmap_ensure_allocated(&t->sessions_by_section, &network_config_hash_ops);
  92         if (r < 0)
  93                 return r;
  94
  95         r = ordered_hashmap_put(t->sessions_by_section, s->section, s);
  96         if (r < 0)
  97                 return r;
  98
  99         *ret = TAKE_PTR(s);
 100         return 0;
 101 }
 102
 103 static int netdev_l2tp_fill_message_tunnel(NetDev *netdev, union in_addr_union *local_address, sd_netlink_message **ret) {
 104         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 105         uint16_t encap_type;
 106         L2tpTunnel *t;
 107         int r;
 108
 109         assert(netdev);
 110         assert(local_address);
 111
 112         t = L2TP(netdev);
 113
 114         assert(t);
 115
 116         r = sd_genl_message_new(netdev->manager->genl, SD_GENL_L2TP, L2TP_CMD_TUNNEL_CREATE, &m);
 117         if (r < 0)
 118                 return log_netdev_error_errno(netdev, r, "Failed to create generic netlink message: %m");
 119
 120         r = sd_netlink_message_append_u32(m, L2TP_ATTR_CONN_ID, t->tunnel_id);
 121         if (r < 0)
 122                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_CONN_ID attribute: %m");
 123
 124         r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_CONN_ID, t->peer_tunnel_id);
 125         if (r < 0)
 126                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PEER_CONN_ID attribute: %m");
 127
 128         r = sd_netlink_message_append_u8(m, L2TP_ATTR_PROTO_VERSION, 3);
 129         if (r < 0)
 130                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PROTO_VERSION attribute: %m");
 131
 132         switch(t->l2tp_encap_type) {
 133         case NETDEV_L2TP_ENCAPTYPE_IP:
 134                 encap_type = L2TP_ENCAPTYPE_IP;
 135                 break;
 136         case NETDEV_L2TP_ENCAPTYPE_UDP:
 137         default:
 138                 encap_type = L2TP_ENCAPTYPE_UDP;
 139                 break;
 140         }
 141
 142         r = sd_netlink_message_append_u16(m, L2TP_ATTR_ENCAP_TYPE, encap_type);
 143         if (r < 0)
 144                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_ENCAP_TYPE attribute: %m");
 145
 146         if (t->family == AF_INET) {
 147                 r = sd_netlink_message_append_in_addr(m, L2TP_ATTR_IP_SADDR, &local_address->in);
 148                 if (r < 0)
 149                         return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IP_SADDR attribute: %m");
 150
 151                 r = sd_netlink_message_append_in_addr(m, L2TP_ATTR_IP_DADDR, &t->remote.in);
 152                 if (r < 0)
 153                         return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IP_DADDR attribute: %m");
 154         } else {
 155                 r = sd_netlink_message_append_in6_addr(m, L2TP_ATTR_IP6_SADDR, &local_address->in6);
 156                 if (r < 0)
 157                         return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IP6_SADDR attribute: %m");
 158
 159                 r = sd_netlink_message_append_in6_addr(m, L2TP_ATTR_IP6_DADDR, &t->remote.in6);
 160                 if (r < 0)
 161                         return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IP6_DADDR attribute: %m");
 162         }
 163
 164         if (encap_type == L2TP_ENCAPTYPE_UDP) {
 165                 r = sd_netlink_message_append_u16(m, L2TP_ATTR_UDP_SPORT, t->l2tp_udp_sport);
 166                 if (r < 0)
 167                         return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_SPORT, attribute: %m");
 168
 169                 r = sd_netlink_message_append_u16(m, L2TP_ATTR_UDP_DPORT, t->l2tp_udp_dport);
 170                 if (r < 0)
 171                         return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_DPORT attribute: %m");
 172
 173                 if (t->udp_csum) {
 174                         r = sd_netlink_message_append_u8(m, L2TP_ATTR_UDP_CSUM, t->udp_csum);
 175                         if (r < 0)
 176                                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_CSUM attribute: %m");
 177                 }
 178
 179                 if (t->udp6_csum_tx) {
 180                         r = sd_netlink_message_append_flag(m, L2TP_ATTR_UDP_ZERO_CSUM6_TX);
 181                         if (r < 0)
 182                                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_ZERO_CSUM6_TX attribute: %m");
 183                 }
 184
 185                 if (t->udp6_csum_rx) {
 186                         r = sd_netlink_message_append_flag(m, L2TP_ATTR_UDP_ZERO_CSUM6_RX);
 187                         if (r < 0)
 188                                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_UDP_ZERO_CSUM6_RX attribute: %m");
 189                 }
 190         }
 191
 192         *ret = TAKE_PTR(m);
 193
 194         return 0;
 195 }
 196
 197 static int netdev_l2tp_fill_message_session(NetDev *netdev, L2tpSession *session, sd_netlink_message **ret) {
 198         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 199         uint16_t l2_spec_len;
 200         uint8_t l2_spec_type;
 201         int r;
 202
 203         assert(netdev);
 204         assert(session);
 205         assert(session->tunnel);
 206
 207         r = sd_genl_message_new(netdev->manager->genl, SD_GENL_L2TP, L2TP_CMD_SESSION_CREATE, &m);
 208         if (r < 0)
 209                 return log_netdev_error_errno(netdev, r, "Failed to create generic netlink message: %m");
 210
 211         r = sd_netlink_message_append_u32(m, L2TP_ATTR_CONN_ID, session->tunnel->tunnel_id);
 212         if (r < 0)
 213                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_CONN_ID attribute: %m");
 214
 215         r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_CONN_ID, session->tunnel->peer_tunnel_id);
 216         if (r < 0)
 217                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PEER_CONN_ID attribute: %m");
 218
 219         r = sd_netlink_message_append_u32(m, L2TP_ATTR_SESSION_ID, session->session_id);
 220         if (r < 0)
 221                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_SESSION_ID attribute: %m");
 222
 223         r = sd_netlink_message_append_u32(m, L2TP_ATTR_PEER_SESSION_ID, session->peer_session_id);
 224         if (r < 0)
 225                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PEER_SESSION_ID attribute: %m");
 226
 227         r = sd_netlink_message_append_u16(m, L2TP_ATTR_PW_TYPE, L2TP_PWTYPE_ETH);
 228         if (r < 0)
 229                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_PW_TYPE attribute: %m");
 230
 231         switch (session->l2tp_l2spec_type) {
 232         case NETDEV_L2TP_L2SPECTYPE_NONE:
 233                 l2_spec_type = L2TP_L2SPECTYPE_NONE;
 234                 l2_spec_len = 0;
 235                 break;
 236         case NETDEV_L2TP_L2SPECTYPE_DEFAULT:
 237         default:
 238                 l2_spec_type = L2TP_L2SPECTYPE_DEFAULT;
 239                 l2_spec_len = 4;
 240                 break;
 241         }
 242
 243         r = sd_netlink_message_append_u8(m, L2TP_ATTR_L2SPEC_TYPE, l2_spec_type);
 244         if (r < 0)
 245                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_L2SPEC_TYPE attribute: %m");
 246
 247         r = sd_netlink_message_append_u8(m, L2TP_ATTR_L2SPEC_LEN, l2_spec_len);
 248         if (r < 0)
 249                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_L2SPEC_LEN attribute: %m");
 250
 251         r = sd_netlink_message_append_string(m, L2TP_ATTR_IFNAME, session->name);
 252         if (r < 0)
 253                 return log_netdev_error_errno(netdev, r, "Could not append L2TP_ATTR_IFNAME attribute: %m");
 254
 255         *ret = TAKE_PTR(m);
 256
 257         return 0;
 258 }
 259
 260 static int l2tp_acquire_local_address_one(L2tpTunnel *t, Address *a, union in_addr_union *ret) {
 261         if (a->family != t->family)
 262                 return -EINVAL;
 263
 264         if (in_addr_is_null(a->family, &a->in_addr_peer) <= 0)
 265                 return -EINVAL;
 266
 267         if (t->local_address_type == NETDEV_L2TP_LOCAL_ADDRESS_STATIC &&
 268             !FLAGS_SET(a->flags, IFA_F_PERMANENT))
 269                 return -EINVAL;
 270
 271         if (t->local_address_type == NETDEV_L2TP_LOCAL_ADDRESS_DYNAMIC &&
 272             FLAGS_SET(a->flags, IFA_F_PERMANENT))
 273                 return -EINVAL;
 274
 275         *ret = a->in_addr;
 276         return 0;
 277 }
 278
 279 static int l2tp_acquire_local_address(L2tpTunnel *t, Link *link, union in_addr_union *ret) {
 280         Address *a;
 281         Iterator i;
 282
 283         assert(t);
 284         assert(link);
 285         assert(ret);
 286         assert(IN_SET(t->family, AF_INET, AF_INET6));
 287
 288         if (!in_addr_is_null(t->family, &t->local)) {
 289                 /* local address is explicitly specified. */
 290                 *ret = t->local;
 291                 return 0;
 292         }
 293
 294         SET_FOREACH(a, link->addresses, i)
 295                 if (l2tp_acquire_local_address_one(t, a, ret) >= 0)
 296                         return 1;
 297
 298         SET_FOREACH(a, link->addresses_foreign, i)
 299                 if (l2tp_acquire_local_address_one(t, a, ret) >= 0)
 300                         return 1;
 301
 302         return -ENODATA;
 303 }
 304
 305 static void l2tp_session_destroy_callback(L2tpSession *session) {
 306         if (!session)
 307                 return;
 308
 309         netdev_unref(NETDEV(session->tunnel));
 310 }
 311
 312 static int l2tp_create_session_handler(sd_netlink *rtnl, sd_netlink_message *m, L2tpSession *session) {
 313         NetDev *netdev;
 314         int r;
 315
 316         assert(session);
 317         assert(session->tunnel);
 318
 319         netdev = NETDEV(session->tunnel);
 320
 321         r = sd_netlink_message_get_errno(m);
 322         if (r == -EEXIST)
 323                 log_netdev_info(netdev, "L2TP session %s exists, using existing without changing its parameters",
 324                                 session->name);
 325         else if (r < 0) {
 326                 log_netdev_warning_errno(netdev, r, "L2TP session %s could not be created: %m", session->name);
 327                 return 1;
 328         }
 329
 330         log_netdev_debug(netdev, "L2TP session %s created", session->name);
 331         return 1;
 332 }
 333
 334 static int l2tp_create_session(NetDev *netdev, L2tpSession *session) {
 335         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *n = NULL;
 336         int r;
 337
 338         r = netdev_l2tp_fill_message_session(netdev, session, &n);
 339         if (r < 0)
 340                 return r;
 341
 342         r = netlink_call_async(netdev->manager->genl, NULL, n, l2tp_create_session_handler,
 343                                l2tp_session_destroy_callback, session);
 344         if (r < 0)
 345                 return log_netdev_error_errno(netdev, r, "Failed to create L2TP session %s: %m", session->name);
 346
 347         netdev_ref(netdev);
 348         return 0;
 349 }
 350
 351 static int l2tp_create_tunnel_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 352         L2tpSession *session;
 353         L2tpTunnel *t;
 354         Iterator i;
 355         int r;
 356
 357         assert(netdev);
 358         assert(netdev->state != _NETDEV_STATE_INVALID);
 359
 360         t = L2TP(netdev);
 361
 362         assert(t);
 363
 364         r = sd_netlink_message_get_errno(m);
 365         if (r == -EEXIST)
 366                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 367         else if (r < 0) {
 368                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 369                 netdev_drop(netdev);
 370
 371                 return 1;
 372         }
 373
 374         log_netdev_debug(netdev, "L2TP tunnel is created");
 375
 376         ORDERED_HASHMAP_FOREACH(session, t->sessions_by_section, i)
 377                 (void) l2tp_create_session(netdev, session);
 378
 379         return 1;
 380 }
 381
 382 static int l2tp_create_tunnel(NetDev *netdev, Link *link) {
 383         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 384         union in_addr_union local_address;
 385         L2tpTunnel *t;
 386         int r;
 387
 388         assert(netdev);
 389
 390         t = L2TP(netdev);
 391
 392         assert(t);
 393
 394         r = l2tp_acquire_local_address(t, link, &local_address);
 395         if (r < 0)
 396                 return log_netdev_error_errno(netdev, r, "Could not find local address.");
 397
 398         if (r > 0 && DEBUG_LOGGING) {
 399                 _cleanup_free_ char *str = NULL;
 400
 401                 (void) in_addr_to_string(t->family, &local_address, &str);
 402                 log_netdev_debug(netdev, "Local address %s acquired.", strna(str));
 403         }
 404
 405         r = netdev_l2tp_fill_message_tunnel(netdev, &local_address, &m);
 406         if (r < 0)
 407                 return r;
 408
 409         r = netlink_call_async(netdev->manager->genl, NULL, m, l2tp_create_tunnel_handler,
 410                                netdev_destroy_callback, netdev);
 411         if (r < 0)
 412                 return log_netdev_error_errno(netdev, r, "Failed to create L2TP tunnel: %m");
 413
 414         netdev_ref(netdev);
 415
 416         return 0;
 417 }
 418
 419 int config_parse_l2tp_tunnel_address(
 420                 const char *unit,
 421                 const char *filename,
 422                 unsigned line,
 423                 const char *section,
 424                 unsigned section_line,
 425                 const char *lvalue,
 426                 int ltype,
 427                 const char *rvalue,
 428                 void *data,
 429                 void *userdata) {
 430
 431         L2tpTunnel *t = userdata;
 432         union in_addr_union *addr = data;
 433         int r;
 434
 435         assert(filename);
 436         assert(lvalue);
 437         assert(rvalue);
 438         assert(data);
 439
 440         if (streq(lvalue, "Local")) {
 441                 L2tpLocalAddressType addr_type;
 442
 443                 if (isempty(rvalue))
 444                         addr_type = NETDEV_L2TP_LOCAL_ADDRESS_AUTO;
 445                 else
 446                         addr_type = l2tp_local_address_type_from_string(rvalue);
 447
 448                 if (addr_type >= 0) {
 449                         if (in_addr_is_null(t->family, &t->remote) != 0)
 450                                 /* If Remote= is not specified yet, then also clear family. */
 451                                 t->family = AF_UNSPEC;
 452
 453                         t->local = IN_ADDR_NULL;
 454                         t->local_address_type = addr_type;
 455
 456                         return 0;
 457                 }
 458         }
 459
 460         if (t->family == AF_UNSPEC)
 461                 r = in_addr_from_string_auto(rvalue, &t->family, addr);
 462         else
 463                 r = in_addr_from_string(t->family, rvalue, addr);
 464         if (r < 0) {
 465                 log_syntax(unit, LOG_ERR, filename, line, r,
 466                            "Invalid L2TP Tunnel address specified in %s='%s', ignoring assignment: %m", lvalue, rvalue);
 467                 return 0;
 468         }
 469
 470         return 0;
 471 }
 472
 473 int config_parse_l2tp_tunnel_id(
 474                 const char *unit,
 475                 const char *filename,
 476                 unsigned line,
 477                 const char *section,
 478                 unsigned section_line,
 479                 const char *lvalue,
 480                 int ltype,
 481                 const char *rvalue,
 482                 void *data,
 483                 void *userdata) {
 484
 485         uint32_t *id = data, k;
 486         int r;
 487
 488         assert(filename);
 489         assert(lvalue);
 490         assert(rvalue);
 491         assert(data);
 492
 493         r = safe_atou32(rvalue, &k);
 494         if (r < 0) {
 495                 log_syntax(unit, LOG_ERR, filename, line, r,
 496                            "Failed to parse L2TP tunnel id. Ignoring assignment: %s", rvalue);
 497                 return 0;
 498         }
 499
 500         if (k == 0) {
 501                 log_syntax(unit, LOG_ERR, filename, line, r,
 502                            "Invalid L2TP tunnel id. Ignoring assignment: %s", rvalue);
 503                 return 0;
 504         }
 505
 506         *id = k;
 507
 508         return 0;
 509 }
 510
 511 int config_parse_l2tp_session_id(
 512                 const char *unit,
 513                 const char *filename,
 514                 unsigned line,
 515                 const char *section,
 516                 unsigned section_line,
 517                 const char *lvalue,
 518                 int ltype,
 519                 const char *rvalue,
 520                 void *data,
 521                 void *userdata) {
 522
 523         _cleanup_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
 524         L2tpTunnel *t = userdata;
 525         uint32_t k;
 526         int r;
 527
 528         assert(filename);
 529         assert(section);
 530         assert(lvalue);
 531         assert(rvalue);
 532         assert(data);
 533
 534         r = l2tp_session_new_static(t, filename, section_line, &session);
 535         if (r < 0)
 536                 return r;
 537
 538         r = safe_atou32(rvalue, &k);
 539         if (r < 0) {
 540                 log_syntax(unit, LOG_ERR, filename, line, r,
 541                            "Failed to parse L2TP session id. Ignoring assignment: %s", rvalue);
 542                 return 0;
 543         }
 544
 545         if (k == 0) {
 546                 log_syntax(unit, LOG_ERR, filename, line, r,
 547                            "Invalid L2TP session id. Ignoring assignment: %s", rvalue);
 548                 return 0;
 549         }
 550
 551         if (streq(lvalue, "SessionId"))
 552                 session->session_id = k;
 553         else
 554                 session->peer_session_id = k;
 555
 556         session = NULL;
 557         return 0;
 558 }
 559
 560 int config_parse_l2tp_session_l2spec(
 561                 const char *unit,
 562                 const char *filename,
 563                 unsigned line,
 564                 const char *section,
 565                 unsigned section_line,
 566                 const char *lvalue,
 567                 int ltype,
 568                 const char *rvalue,
 569                 void *data,
 570                 void *userdata) {
 571
 572         _cleanup_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
 573         L2tpTunnel *t = userdata;
 574         L2tpL2specType spec;
 575         int r;
 576
 577         assert(filename);
 578         assert(section);
 579         assert(lvalue);
 580         assert(rvalue);
 581         assert(data);
 582
 583         r = l2tp_session_new_static(t, filename, section_line, &session);
 584         if (r < 0)
 585                 return r;
 586
 587         spec = l2tp_l2spec_type_from_string(rvalue);
 588         if (spec < 0) {
 589                 log_syntax(unit, LOG_ERR, filename, line, 0,
 590                            "Failed to parse layer2 specific header type. Ignoring assignment: %s", rvalue);
 591                 return 0;
 592         }
 593
 594         session->l2tp_l2spec_type = spec;
 595
 596         session = NULL;
 597         return 0;
 598 }
 599
 600 int config_parse_l2tp_session_name(
 601                 const char *unit,
 602                 const char *filename,
 603                 unsigned line,
 604                 const char *section,
 605                 unsigned section_line,
 606                 const char *lvalue,
 607                 int ltype,
 608                 const char *rvalue,
 609                 void *data,
 610                 void *userdata) {
 611
 612         _cleanup_(l2tp_session_free_or_set_invalidp) L2tpSession *session = NULL;
 613         L2tpTunnel *t = userdata;
 614         int r;
 615
 616         assert(filename);
 617         assert(section);
 618         assert(lvalue);
 619         assert(rvalue);
 620         assert(data);
 621
 622         r = l2tp_session_new_static(t, filename, section_line, &session);
 623         if (r < 0)
 624                 return r;
 625
 626         if (!ifname_valid(rvalue)) {
 627                 log_syntax(unit, LOG_ERR, filename, line, 0,
 628                            "Failed to parse L2TP tunnel session name. Ignoring assignment: %s", rvalue);
 629                 return 0;
 630         }
 631
 632         r = free_and_strdup(&session->name, rvalue);
 633         if (r < 0)
 634                 return log_oom();
 635
 636         session = NULL;
 637         return 0;
 638 }
 639
 640 static void l2tp_tunnel_init(NetDev *netdev) {
 641         L2tpTunnel *t;
 642
 643         assert(netdev);
 644
 645         t = L2TP(netdev);
 646
 647         assert(t);
 648
 649         t->l2tp_encap_type = NETDEV_L2TP_ENCAPTYPE_UDP;
 650         t->udp6_csum_rx = true;
 651         t->udp6_csum_tx = true;
 652 }
 653
 654 static int l2tp_session_verify(L2tpSession *session) {
 655         NetDev *netdev;
 656
 657         assert(session);
 658         assert(session->tunnel);
 659
 660         netdev = NETDEV(session->tunnel);
 661
 662         if (section_is_invalid(session->section))
 663                 return -EINVAL;
 664
 665         if (!session->name)
 666                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 667                                               "%s: L2TP session without name configured. "
 668                                               "Ignoring [L2TPSession] section from line %u",
 669                                               session->section->filename, session->section->line);
 670
 671         if (session->session_id == 0 || session->peer_session_id == 0)
 672                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 673                                               "%s: L2TP session without session IDs configured. "
 674                                               "Ignoring [L2TPSession] section from line %u",
 675                                               session->section->filename, session->section->line);
 676
 677         return 0;
 678 }
 679
 680 static int netdev_l2tp_tunnel_verify(NetDev *netdev, const char *filename) {
 681         L2tpTunnel *t;
 682         L2tpSession *session;
 683         Iterator i;
 684
 685         assert(netdev);
 686         assert(filename);
 687
 688         t = L2TP(netdev);
 689
 690         assert(t);
 691
 692         if (!IN_SET(t->family, AF_INET, AF_INET6))
 693                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 694                                               "%s: L2TP tunnel with invalid address family configured. Ignoring",
 695                                               filename);
 696
 697         if (in_addr_is_null(t->family, &t->remote))
 698                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 699                                               "%s: L2TP tunnel without a remote address configured. Ignoring",
 700                                               filename);
 701
 702         if (t->tunnel_id == 0 || t->peer_tunnel_id == 0)
 703                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 704                                               "%s: L2TP tunnel without tunnel IDs configured. Ignoring",
 705                                               filename);
 706
 707         ORDERED_HASHMAP_FOREACH(session, t->sessions_by_section, i)
 708                 if (l2tp_session_verify(session) < 0)
 709                         l2tp_session_free(session);
 710
 711         return 0;
 712 }
 713
 714 static void l2tp_tunnel_done(NetDev *netdev) {
 715         L2tpTunnel *t;
 716
 717         assert(netdev);
 718
 719         t = L2TP(netdev);
 720
 721         assert(t);
 722
 723         ordered_hashmap_free_with_destructor(t->sessions_by_section, l2tp_session_free);
 724 }
 725
 726 const NetDevVTable l2tptnl_vtable = {
 727         .object_size = sizeof(L2tpTunnel),
 728         .init = l2tp_tunnel_init,
 729         .sections = "Match\0NetDev\0L2TP\0L2TPSession\0",
 730         .create_after_configured = l2tp_create_tunnel,
 731         .done = l2tp_tunnel_done,
 732         .create_type = NETDEV_CREATE_AFTER_CONFIGURED,
 733         .config_verify = netdev_l2tp_tunnel_verify,
 734 };