src/nspawn/nspawn-network.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <net/if.h>
   4 #include <linux/if.h>
   5 #include <linux/veth.h>
   6 #include <sys/file.h>
   7
   8 #include "sd-device.h"
   9 #include "sd-id128.h"
  10 #include "sd-netlink.h"
  11
  12 #include "alloc-util.h"
  13 #include "ether-addr-util.h"
  14 #include "hexdecoct.h"
  15 #include "lockfile-util.h"
  16 #include "missing_network.h"
  17 #include "netif-naming-scheme.h"
  18 #include "netlink-util.h"
  19 #include "nspawn-network.h"
  20 #include "parse-util.h"
  21 #include "siphash24.h"
  22 #include "socket-netlink.h"
  23 #include "socket-util.h"
  24 #include "stat-util.h"
  25 #include "string-util.h"
  26 #include "strv.h"
  27 #include "udev-util.h"
  28 #include "util.h"
  29
  30 #define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
  31 #define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
  32 #define VETH_EXTRA_HOST_HASH_KEY SD_ID128_MAKE(48,c7,f6,b7,ea,9d,4c,9e,b7,28,d4,de,91,d5,bf,66)
  33 #define VETH_EXTRA_CONTAINER_HASH_KEY SD_ID128_MAKE(af,50,17,61,ce,f9,4d,35,84,0d,2b,20,54,be,ce,59)
  34 #define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
  35 #define SHORTEN_IFNAME_HASH_KEY SD_ID128_MAKE(e1,90,a4,04,a8,ef,4b,51,8c,cc,c3,3a,9f,11,fc,a2)
  36
  37 static int remove_one_link(sd_netlink *rtnl, const char *name) {
  38         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
  39         int r;
  40
  41         if (isempty(name))
  42                 return 0;
  43
  44         r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0);
  45         if (r < 0)
  46                 return log_error_errno(r, "Failed to allocate netlink message: %m");
  47
  48         r = sd_netlink_message_append_string(m, IFLA_IFNAME, name);
  49         if (r < 0)
  50                 return log_error_errno(r, "Failed to add netlink interface name: %m");
  51
  52         r = sd_netlink_call(rtnl, m, 0, NULL);
  53         if (r == -ENODEV) /* Already gone */
  54                 return 0;
  55         if (r < 0)
  56                 return log_error_errno(r, "Failed to remove interface %s: %m", name);
  57
  58         return 1;
  59 }
  60
  61 static int generate_mac(
  62                 const char *machine_name,
  63                 struct ether_addr *mac,
  64                 sd_id128_t hash_key,
  65                 uint64_t idx) {
  66
  67         uint64_t result;
  68         size_t l, sz;
  69         uint8_t *v, *i;
  70         int r;
  71
  72         l = strlen(machine_name);
  73         sz = sizeof(sd_id128_t) + l;
  74         if (idx > 0)
  75                 sz += sizeof(idx);
  76
  77         v = newa(uint8_t, sz);
  78
  79         /* fetch some persistent data unique to the host */
  80         r = sd_id128_get_machine((sd_id128_t*) v);
  81         if (r < 0)
  82                 return r;
  83
  84         /* combine with some data unique (on this host) to this
  85          * container instance */
  86         i = mempcpy(v + sizeof(sd_id128_t), machine_name, l);
  87         if (idx > 0) {
  88                 idx = htole64(idx);
  89                 memcpy(i, &idx, sizeof(idx));
  90         }
  91
  92         /* Let's hash the host machine ID plus the container name. We
  93          * use a fixed, but originally randomly created hash key here. */
  94         result = htole64(siphash24(v, sz, hash_key.bytes));
  95
  96         assert_cc(ETH_ALEN <= sizeof(result));
  97         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
  98
  99         /* see eth_random_addr in the kernel */
 100         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 101         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 102
 103         return 0;
 104 }
 105
 106 static int set_alternative_ifname(sd_netlink *rtnl, const char *ifname, const char *altifname) {
 107         int r;
 108
 109         assert(rtnl);
 110         assert(ifname);
 111
 112         if (!altifname)
 113                 return 0;
 114
 115         if (strlen(altifname) >= ALTIFNAMSIZ)
 116                 return log_warning_errno(SYNTHETIC_ERRNO(ERANGE),
 117                                          "Alternative interface name '%s' for '%s' is too long, ignoring",
 118                                          altifname, ifname);
 119
 120         r = rtnl_set_link_alternative_names_by_ifname(&rtnl, ifname, STRV_MAKE(altifname));
 121         if (r < 0)
 122                 return log_warning_errno(r,
 123                                          "Failed to set alternative interface name '%s' to '%s', ignoring: %m",
 124                                          altifname, ifname);
 125
 126         return 0;
 127 }
 128
 129 static int add_veth(
 130                 sd_netlink *rtnl,
 131                 pid_t pid,
 132                 const char *ifname_host,
 133                 const char *altifname_host,
 134                 const struct ether_addr *mac_host,
 135                 const char *ifname_container,
 136                 const struct ether_addr *mac_container) {
 137
 138         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 139         int r;
 140
 141         assert(rtnl);
 142         assert(ifname_host);
 143         assert(mac_host);
 144         assert(ifname_container);
 145         assert(mac_container);
 146
 147         r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 148         if (r < 0)
 149                 return log_error_errno(r, "Failed to allocate netlink message: %m");
 150
 151         r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_host);
 152         if (r < 0)
 153                 return log_error_errno(r, "Failed to add netlink interface name: %m");
 154
 155         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_host);
 156         if (r < 0)
 157                 return log_error_errno(r, "Failed to add netlink MAC address: %m");
 158
 159         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 160         if (r < 0)
 161                 return log_error_errno(r, "Failed to open netlink container: %m");
 162
 163         r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth");
 164         if (r < 0)
 165                 return log_error_errno(r, "Failed to open netlink container: %m");
 166
 167         r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
 168         if (r < 0)
 169                 return log_error_errno(r, "Failed to open netlink container: %m");
 170
 171         r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_container);
 172         if (r < 0)
 173                 return log_error_errno(r, "Failed to add netlink interface name: %m");
 174
 175         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_container);
 176         if (r < 0)
 177                 return log_error_errno(r, "Failed to add netlink MAC address: %m");
 178
 179         r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
 180         if (r < 0)
 181                 return log_error_errno(r, "Failed to add netlink namespace field: %m");
 182
 183         r = sd_netlink_message_close_container(m);
 184         if (r < 0)
 185                 return log_error_errno(r, "Failed to close netlink container: %m");
 186
 187         r = sd_netlink_message_close_container(m);
 188         if (r < 0)
 189                 return log_error_errno(r, "Failed to close netlink container: %m");
 190
 191         r = sd_netlink_message_close_container(m);
 192         if (r < 0)
 193                 return log_error_errno(r, "Failed to close netlink container: %m");
 194
 195         r = sd_netlink_call(rtnl, m, 0, NULL);
 196         if (r < 0)
 197                 return log_error_errno(r, "Failed to add new veth interfaces (%s:%s): %m", ifname_host, ifname_container);
 198
 199         (void) set_alternative_ifname(rtnl, ifname_host, altifname_host);
 200
 201         return 0;
 202 }
 203
 204 static int shorten_ifname(char *ifname) {
 205         char new_ifname[IFNAMSIZ];
 206
 207         assert(ifname);
 208
 209         if (strlen(ifname) < IFNAMSIZ) /* Name is short enough */
 210                 return 0;
 211
 212         if (naming_scheme_has(NAMING_NSPAWN_LONG_HASH)) {
 213                 uint64_t h;
 214
 215                 /* Calculate 64bit hash value */
 216                 h = siphash24(ifname, strlen(ifname), SHORTEN_IFNAME_HASH_KEY.bytes);
 217
 218                 /* Set the final four bytes (i.e. 32bit) to the lower 24bit of the hash, encoded in url-safe base64 */
 219                 memcpy(new_ifname, ifname, IFNAMSIZ - 5);
 220                 new_ifname[IFNAMSIZ - 5] = urlsafe_base64char(h >> 18);
 221                 new_ifname[IFNAMSIZ - 4] = urlsafe_base64char(h >> 12);
 222                 new_ifname[IFNAMSIZ - 3] = urlsafe_base64char(h >> 6);
 223                 new_ifname[IFNAMSIZ - 2] = urlsafe_base64char(h);
 224         } else
 225                 /* On old nspawn versions we just truncated the name, provide compatibility */
 226                 memcpy(new_ifname, ifname, IFNAMSIZ-1);
 227
 228         new_ifname[IFNAMSIZ - 1] = 0;
 229
 230         /* Log the incident to make it more discoverable */
 231         log_warning("Network interface name '%s' has been changed to '%s' to fit length constraints.", ifname, new_ifname);
 232
 233         strcpy(ifname, new_ifname);
 234         return 1;
 235 }
 236
 237 int setup_veth(const char *machine_name,
 238                pid_t pid,
 239                char iface_name[IFNAMSIZ],
 240                bool bridge) {
 241
 242         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 243         struct ether_addr mac_host, mac_container;
 244         unsigned u;
 245         char *n, *a = NULL;
 246         int r;
 247
 248         assert(machine_name);
 249         assert(pid > 0);
 250         assert(iface_name);
 251
 252         /* Use two different interface name prefixes depending whether
 253          * we are in bridge mode or not. */
 254         n = strjoina(bridge ? "vb-" : "ve-", machine_name);
 255         r = shorten_ifname(n);
 256         if (r > 0)
 257                 a = strjoina(bridge ? "vb-" : "ve-", machine_name);
 258
 259         r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0);
 260         if (r < 0)
 261                 return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
 262
 263         r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0);
 264         if (r < 0)
 265                 return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
 266
 267         r = sd_netlink_open(&rtnl);
 268         if (r < 0)
 269                 return log_error_errno(r, "Failed to connect to netlink: %m");
 270
 271         r = add_veth(rtnl, pid, n, a, &mac_host, "host0", &mac_container);
 272         if (r < 0)
 273                 return r;
 274
 275         u = if_nametoindex(n); /* We don't need to use rtnl_resolve_ifname() here because the
 276                                 * name we assigned is always the main name. */
 277         if (u == 0)
 278                 return log_error_errno(errno, "Failed to resolve interface %s: %m", n);
 279
 280         strcpy(iface_name, n);
 281         return (int) u;
 282 }
 283
 284 int setup_veth_extra(
 285                 const char *machine_name,
 286                 pid_t pid,
 287                 char **pairs) {
 288
 289         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 290         uint64_t idx = 0;
 291         int r;
 292
 293         assert(machine_name);
 294         assert(pid > 0);
 295
 296         if (strv_isempty(pairs))
 297                 return 0;
 298
 299         r = sd_netlink_open(&rtnl);
 300         if (r < 0)
 301                 return log_error_errno(r, "Failed to connect to netlink: %m");
 302
 303         STRV_FOREACH_PAIR(a, b, pairs) {
 304                 struct ether_addr mac_host, mac_container;
 305
 306                 r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx);
 307                 if (r < 0)
 308                         return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m");
 309
 310                 r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx);
 311                 if (r < 0)
 312                         return log_error_errno(r, "Failed to generate predictable MAC address for host side of extra veth link: %m");
 313
 314                 r = add_veth(rtnl, pid, *a, NULL, &mac_host, *b, &mac_container);
 315                 if (r < 0)
 316                         return r;
 317
 318                 idx++;
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) {
 325         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 326         int r, bridge_ifi;
 327
 328         assert(rtnl);
 329         assert(veth_name);
 330         assert(bridge_name);
 331
 332         bridge_ifi = rtnl_resolve_interface(&rtnl, bridge_name);
 333         if (bridge_ifi < 0)
 334                 return bridge_ifi;
 335
 336         r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
 337         if (r < 0)
 338                 return r;
 339
 340         r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
 341         if (r < 0)
 342                 return r;
 343
 344         r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name);
 345         if (r < 0)
 346                 return r;
 347
 348         r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi);
 349         if (r < 0)
 350                 return r;
 351
 352         r = sd_netlink_call(rtnl, m, 0, NULL);
 353         if (r < 0)
 354                 return r;
 355
 356         return bridge_ifi;
 357 }
 358
 359 static int create_bridge(sd_netlink *rtnl, const char *bridge_name) {
 360         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 361         int r;
 362
 363         r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 364         if (r < 0)
 365                 return r;
 366
 367         r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name);
 368         if (r < 0)
 369                 return r;
 370
 371         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 372         if (r < 0)
 373                 return r;
 374
 375         r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge");
 376         if (r < 0)
 377                 return r;
 378
 379         r = sd_netlink_message_close_container(m);
 380         if (r < 0)
 381                 return r;
 382
 383         r = sd_netlink_message_close_container(m);
 384         if (r < 0)
 385                 return r;
 386
 387         r = sd_netlink_call(rtnl, m, 0, NULL);
 388         if (r < 0)
 389                 return r;
 390
 391         return 0;
 392 }
 393
 394 int setup_bridge(const char *veth_name, const char *bridge_name, bool create) {
 395         _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT;
 396         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 397         int r, bridge_ifi;
 398         unsigned n = 0;
 399
 400         assert(veth_name);
 401         assert(bridge_name);
 402
 403         r = sd_netlink_open(&rtnl);
 404         if (r < 0)
 405                 return log_error_errno(r, "Failed to connect to netlink: %m");
 406
 407         if (create) {
 408                 /* We take a system-wide lock here, so that we can safely check whether there's still a member in the
 409                  * bridge before removing it, without risking interference from other nspawn instances. */
 410
 411                 r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
 412                 if (r < 0)
 413                         return log_error_errno(r, "Failed to take network zone lock: %m");
 414         }
 415
 416         for (;;) {
 417                 bridge_ifi = join_bridge(rtnl, veth_name, bridge_name);
 418                 if (bridge_ifi >= 0)
 419                         return bridge_ifi;
 420                 if (bridge_ifi != -ENODEV || !create || n > 10)
 421                         return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name);
 422
 423                 /* Count attempts, so that we don't enter an endless loop here. */
 424                 n++;
 425
 426                 /* The bridge doesn't exist yet. Let's create it */
 427                 r = create_bridge(rtnl, bridge_name);
 428                 if (r < 0)
 429                         return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name);
 430
 431                 /* Try again, now that the bridge exists */
 432         }
 433 }
 434
 435 int remove_bridge(const char *bridge_name) {
 436         _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT;
 437         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 438         const char *path;
 439         int r;
 440
 441         /* Removes the specified bridge, but only if it is currently empty */
 442
 443         if (isempty(bridge_name))
 444                 return 0;
 445
 446         r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
 447         if (r < 0)
 448                 return log_error_errno(r, "Failed to take network zone lock: %m");
 449
 450         path = strjoina("/sys/class/net/", bridge_name, "/brif");
 451
 452         r = dir_is_empty(path);
 453         if (r == -ENOENT) /* Already gone? */
 454                 return 0;
 455         if (r < 0)
 456                 return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name);
 457         if (r == 0) /* Still populated, leave it around */
 458                 return 0;
 459
 460         r = sd_netlink_open(&rtnl);
 461         if (r < 0)
 462                 return log_error_errno(r, "Failed to connect to netlink: %m");
 463
 464         return remove_one_link(rtnl, bridge_name);
 465 }
 466
 467 int test_network_interface_initialized(const char *name) {
 468         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 469         int r;
 470
 471         if (path_is_read_only_fs("/sys") > 0)
 472                 return 0;
 473
 474         /* udev should be around. */
 475
 476         r = sd_device_new_from_ifname(&d, name);
 477         if (r < 0)
 478                 return log_error_errno(r, "Failed to get device %s: %m", name);
 479
 480         r = sd_device_get_is_initialized(d);
 481         if (r < 0)
 482                 return log_error_errno(r, "Failed to determine whether interface %s is initialized: %m", name);
 483         if (r == 0)
 484                 return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Network interface %s is not initialized yet.", name);
 485
 486         r = device_is_renaming(d);
 487         if (r < 0)
 488                 return log_error_errno(r, "Failed to determine the interface %s is being renamed: %m", name);
 489         if (r > 0)
 490                 return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Interface %s is being renamed.", name);
 491
 492         return 0;
 493 }
 494
 495 int move_network_interfaces(int netns_fd, char **ifaces) {
 496         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 497         int r;
 498
 499         if (strv_isempty(ifaces))
 500                 return 0;
 501
 502         r = sd_netlink_open(&rtnl);
 503         if (r < 0)
 504                 return log_error_errno(r, "Failed to connect to netlink: %m");
 505
 506         STRV_FOREACH(i, ifaces) {
 507                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 508                 int ifi;
 509
 510                 ifi = rtnl_resolve_interface_or_warn(&rtnl, *i);
 511                 if (ifi < 0)
 512                         return ifi;
 513
 514                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
 515                 if (r < 0)
 516                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 517
 518                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_FD, netns_fd);
 519                 if (r < 0)
 520                         return log_error_errno(r, "Failed to append namespace fd to netlink message: %m");
 521
 522                 r = sd_netlink_call(rtnl, m, 0, NULL);
 523                 if (r < 0)
 524                         return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
 525         }
 526
 527         return 0;
 528 }
 529
 530 int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) {
 531         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 532         unsigned idx = 0;
 533         int r;
 534
 535         if (strv_isempty(ifaces))
 536                 return 0;
 537
 538         r = sd_netlink_open(&rtnl);
 539         if (r < 0)
 540                 return log_error_errno(r, "Failed to connect to netlink: %m");
 541
 542         STRV_FOREACH(i, ifaces) {
 543                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 544                 _cleanup_free_ char *n = NULL, *a = NULL;
 545                 struct ether_addr mac;
 546                 int ifi;
 547
 548                 ifi = rtnl_resolve_interface_or_warn(&rtnl, *i);
 549                 if (ifi < 0)
 550                         return ifi;
 551
 552                 r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++);
 553                 if (r < 0)
 554                         return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
 555
 556                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 557                 if (r < 0)
 558                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 559
 560                 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
 561                 if (r < 0)
 562                         return log_error_errno(r, "Failed to add netlink interface index: %m");
 563
 564                 n = strjoin("mv-", *i);
 565                 if (!n)
 566                         return log_oom();
 567
 568                 r = shorten_ifname(n);
 569                 if (r > 0) {
 570                         a = strjoin("mv-", *i);
 571                         if (!a)
 572                                 return log_oom();
 573                 }
 574
 575                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
 576                 if (r < 0)
 577                         return log_error_errno(r, "Failed to add netlink interface name: %m");
 578
 579                 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
 580                 if (r < 0)
 581                         return log_error_errno(r, "Failed to add netlink MAC address: %m");
 582
 583                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
 584                 if (r < 0)
 585                         return log_error_errno(r, "Failed to add netlink namespace field: %m");
 586
 587                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 588                 if (r < 0)
 589                         return log_error_errno(r, "Failed to open netlink container: %m");
 590
 591                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
 592                 if (r < 0)
 593                         return log_error_errno(r, "Failed to open netlink container: %m");
 594
 595                 r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
 596                 if (r < 0)
 597                         return log_error_errno(r, "Failed to append macvlan mode: %m");
 598
 599                 r = sd_netlink_message_close_container(m);
 600                 if (r < 0)
 601                         return log_error_errno(r, "Failed to close netlink container: %m");
 602
 603                 r = sd_netlink_message_close_container(m);
 604                 if (r < 0)
 605                         return log_error_errno(r, "Failed to close netlink container: %m");
 606
 607                 r = sd_netlink_call(rtnl, m, 0, NULL);
 608                 if (r < 0)
 609                         return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
 610
 611                 (void) set_alternative_ifname(rtnl, n, a);
 612         }
 613
 614         return 0;
 615 }
 616
 617 int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) {
 618         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 619         int r;
 620
 621         if (strv_isempty(ifaces))
 622                 return 0;
 623
 624         r = sd_netlink_open(&rtnl);
 625         if (r < 0)
 626                 return log_error_errno(r, "Failed to connect to netlink: %m");
 627
 628         STRV_FOREACH(i, ifaces) {
 629                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 630                 _cleanup_free_ char *n = NULL, *a = NULL;
 631                 int ifi;
 632
 633                 ifi = rtnl_resolve_interface_or_warn(&rtnl, *i);
 634                 if (ifi < 0)
 635                         return ifi;
 636
 637                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 638                 if (r < 0)
 639                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 640
 641                 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
 642                 if (r < 0)
 643                         return log_error_errno(r, "Failed to add netlink interface index: %m");
 644
 645                 n = strjoin("iv-", *i);
 646                 if (!n)
 647                         return log_oom();
 648
 649                 r = shorten_ifname(n);
 650                 if (r > 0) {
 651                         a = strjoin("iv-", *i);
 652                         if (!a)
 653                                 return log_oom();
 654                 }
 655
 656                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
 657                 if (r < 0)
 658                         return log_error_errno(r, "Failed to add netlink interface name: %m");
 659
 660                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
 661                 if (r < 0)
 662                         return log_error_errno(r, "Failed to add netlink namespace field: %m");
 663
 664                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 665                 if (r < 0)
 666                         return log_error_errno(r, "Failed to open netlink container: %m");
 667
 668                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
 669                 if (r < 0)
 670                         return log_error_errno(r, "Failed to open netlink container: %m");
 671
 672                 r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
 673                 if (r < 0)
 674                         return log_error_errno(r, "Failed to add ipvlan mode: %m");
 675
 676                 r = sd_netlink_message_close_container(m);
 677                 if (r < 0)
 678                         return log_error_errno(r, "Failed to close netlink container: %m");
 679
 680                 r = sd_netlink_message_close_container(m);
 681                 if (r < 0)
 682                         return log_error_errno(r, "Failed to close netlink container: %m");
 683
 684                 r = sd_netlink_call(rtnl, m, 0, NULL);
 685                 if (r < 0)
 686                         return log_error_errno(r, "Failed to add new ipvlan interfaces: %m");
 687
 688                 (void) set_alternative_ifname(rtnl, n, a);
 689         }
 690
 691         return 0;
 692 }
 693
 694 int veth_extra_parse(char ***l, const char *p) {
 695         _cleanup_free_ char *a = NULL, *b = NULL;
 696         int r;
 697
 698         r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
 699         if (r < 0)
 700                 return r;
 701         if (r == 0 || !ifname_valid(a))
 702                 return -EINVAL;
 703
 704         r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
 705         if (r < 0)
 706                 return r;
 707         if (r == 0 || !ifname_valid(b)) {
 708                 free(b);
 709                 b = strdup(a);
 710                 if (!b)
 711                         return -ENOMEM;
 712         }
 713
 714         if (p)
 715                 return -EINVAL;
 716
 717         r = strv_push_pair(l, a, b);
 718         if (r < 0)
 719                 return -ENOMEM;
 720
 721         a = b = NULL;
 722         return 0;
 723 }
 724
 725 int remove_veth_links(const char *primary, char **pairs) {
 726         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 727         int r;
 728
 729         /* In some cases the kernel might pin the veth links between host and container even after the namespace
 730          * died. Hence, let's better remove them explicitly too. */
 731
 732         if (isempty(primary) && strv_isempty(pairs))
 733                 return 0;
 734
 735         r = sd_netlink_open(&rtnl);
 736         if (r < 0)
 737                 return log_error_errno(r, "Failed to connect to netlink: %m");
 738
 739         remove_one_link(rtnl, primary);
 740
 741         STRV_FOREACH_PAIR(a, b, pairs)
 742                 remove_one_link(rtnl, *a);
 743
 744         return 0;
 745 }