src/nspawn/nspawn-network.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   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 "lockfile-util.h"
  15 #include "missing_network.h"
  16 #include "netif-naming-scheme.h"
  17 #include "netlink-util.h"
  18 #include "nspawn-network.h"
  19 #include "parse-util.h"
  20 #include "siphash24.h"
  21 #include "socket-netlink.h"
  22 #include "socket-util.h"
  23 #include "stat-util.h"
  24 #include "string-util.h"
  25 #include "strv.h"
  26 #include "udev-util.h"
  27 #include "util.h"
  28
  29 #define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
  30 #define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
  31 #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)
  32 #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)
  33 #define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
  34 #define SHORTEN_IFNAME_HASH_KEY SD_ID128_MAKE(e1,90,a4,04,a8,ef,4b,51,8c,cc,c3,3a,9f,11,fc,a2)
  35
  36 static int remove_one_link(sd_netlink *rtnl, const char *name) {
  37         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
  38         int r;
  39
  40         if (isempty(name))
  41                 return 0;
  42
  43         r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0);
  44         if (r < 0)
  45                 return log_error_errno(r, "Failed to allocate netlink message: %m");
  46
  47         r = sd_netlink_message_append_string(m, IFLA_IFNAME, name);
  48         if (r < 0)
  49                 return log_error_errno(r, "Failed to add netlink interface name: %m");
  50
  51         r = sd_netlink_call(rtnl, m, 0, NULL);
  52         if (r == -ENODEV) /* Already gone */
  53                 return 0;
  54         if (r < 0)
  55                 return log_error_errno(r, "Failed to remove interface %s: %m", name);
  56
  57         return 1;
  58 }
  59
  60 static int generate_mac(
  61                 const char *machine_name,
  62                 struct ether_addr *mac,
  63                 sd_id128_t hash_key,
  64                 uint64_t idx) {
  65
  66         uint64_t result;
  67         size_t l, sz;
  68         uint8_t *v, *i;
  69         int r;
  70
  71         l = strlen(machine_name);
  72         sz = sizeof(sd_id128_t) + l;
  73         if (idx > 0)
  74                 sz += sizeof(idx);
  75
  76         v = newa(uint8_t, sz);
  77
  78         /* fetch some persistent data unique to the host */
  79         r = sd_id128_get_machine((sd_id128_t*) v);
  80         if (r < 0)
  81                 return r;
  82
  83         /* combine with some data unique (on this host) to this
  84          * container instance */
  85         i = mempcpy(v + sizeof(sd_id128_t), machine_name, l);
  86         if (idx > 0) {
  87                 idx = htole64(idx);
  88                 memcpy(i, &idx, sizeof(idx));
  89         }
  90
  91         /* Let's hash the host machine ID plus the container name. We
  92          * use a fixed, but originally randomly created hash key here. */
  93         result = htole64(siphash24(v, sz, hash_key.bytes));
  94
  95         assert_cc(ETH_ALEN <= sizeof(result));
  96         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
  97
  98         /* see eth_random_addr in the kernel */
  99         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 100         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 101
 102         return 0;
 103 }
 104
 105 static int set_alternative_ifname(sd_netlink *rtnl, const char *ifname, const char *altifname) {
 106         int r;
 107
 108         assert(rtnl);
 109         assert(ifname);
 110
 111         if (!altifname)
 112                 return 0;
 113
 114         if (strlen(altifname) >= ALTIFNAMSIZ)
 115                 return log_warning_errno(SYNTHETIC_ERRNO(ERANGE),
 116                                          "Alternative interface name '%s' for '%s' is too long, ignoring",
 117                                          altifname, ifname);
 118
 119         r = rtnl_set_link_alternative_names_by_ifname(&rtnl, ifname, STRV_MAKE(altifname));
 120         if (r < 0)
 121                 return log_warning_errno(r,
 122                                          "Failed to set alternative interface name '%s' to '%s', ignoring: %m",
 123                                          altifname, ifname);
 124
 125         return 0;
 126 }
 127
 128 static int add_veth(
 129                 sd_netlink *rtnl,
 130                 pid_t pid,
 131                 const char *ifname_host,
 132                 const char *altifname_host,
 133                 const struct ether_addr *mac_host,
 134                 const char *ifname_container,
 135                 const struct ether_addr *mac_container) {
 136
 137         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 138         int r;
 139
 140         assert(rtnl);
 141         assert(ifname_host);
 142         assert(mac_host);
 143         assert(ifname_container);
 144         assert(mac_container);
 145
 146         r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 147         if (r < 0)
 148                 return log_error_errno(r, "Failed to allocate netlink message: %m");
 149
 150         r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_host);
 151         if (r < 0)
 152                 return log_error_errno(r, "Failed to add netlink interface name: %m");
 153
 154         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_host);
 155         if (r < 0)
 156                 return log_error_errno(r, "Failed to add netlink MAC address: %m");
 157
 158         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 159         if (r < 0)
 160                 return log_error_errno(r, "Failed to open netlink container: %m");
 161
 162         r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "veth");
 163         if (r < 0)
 164                 return log_error_errno(r, "Failed to open netlink container: %m");
 165
 166         r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
 167         if (r < 0)
 168                 return log_error_errno(r, "Failed to open netlink container: %m");
 169
 170         r = sd_netlink_message_append_string(m, IFLA_IFNAME, ifname_container);
 171         if (r < 0)
 172                 return log_error_errno(r, "Failed to add netlink interface name: %m");
 173
 174         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, mac_container);
 175         if (r < 0)
 176                 return log_error_errno(r, "Failed to add netlink MAC address: %m");
 177
 178         r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
 179         if (r < 0)
 180                 return log_error_errno(r, "Failed to add netlink namespace field: %m");
 181
 182         r = sd_netlink_message_close_container(m);
 183         if (r < 0)
 184                 return log_error_errno(r, "Failed to close netlink container: %m");
 185
 186         r = sd_netlink_message_close_container(m);
 187         if (r < 0)
 188                 return log_error_errno(r, "Failed to close netlink container: %m");
 189
 190         r = sd_netlink_message_close_container(m);
 191         if (r < 0)
 192                 return log_error_errno(r, "Failed to close netlink container: %m");
 193
 194         r = sd_netlink_call(rtnl, m, 0, NULL);
 195         if (r < 0)
 196                 return log_error_errno(r, "Failed to add new veth interfaces (%s:%s): %m", ifname_host, ifname_container);
 197
 198         (void) set_alternative_ifname(rtnl, ifname_host, altifname_host);
 199
 200         return 0;
 201 }
 202
 203 /* This is almost base64char(), but not entirely, as it uses the "url and filename safe" alphabet, since we
 204  * don't want "/" appear in interface names (since interfaces appear in sysfs as filenames). See section #5
 205  * of RFC 4648. */
 206 static char urlsafe_base64char(int x) {
 207         static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 208                                       "abcdefghijklmnopqrstuvwxyz"
 209                                       "0123456789-_";
 210         return table[x & 63];
 211 }
 212
 213 static int shorten_ifname(char *ifname) {
 214         char new_ifname[IFNAMSIZ];
 215
 216         assert(ifname);
 217
 218         if (strlen(ifname) < IFNAMSIZ) /* Name is short enough */
 219                 return 0;
 220
 221         if (naming_scheme_has(NAMING_NSPAWN_LONG_HASH)) {
 222                 uint64_t h;
 223
 224                 /* Calculate 64bit hash value */
 225                 h = siphash24(ifname, strlen(ifname), SHORTEN_IFNAME_HASH_KEY.bytes);
 226
 227                 /* Set the final four bytes (i.e. 32bit) to the lower 24bit of the hash, encoded in url-safe base64 */
 228                 memcpy(new_ifname, ifname, IFNAMSIZ - 5);
 229                 new_ifname[IFNAMSIZ - 5] = urlsafe_base64char(h >> 18);
 230                 new_ifname[IFNAMSIZ - 4] = urlsafe_base64char(h >> 12);
 231                 new_ifname[IFNAMSIZ - 3] = urlsafe_base64char(h >> 6);
 232                 new_ifname[IFNAMSIZ - 2] = urlsafe_base64char(h);
 233         } else
 234                 /* On old nspawn versions we just truncated the name, provide compatibility */
 235                 memcpy(new_ifname, ifname, IFNAMSIZ-1);
 236
 237         new_ifname[IFNAMSIZ - 1] = 0;
 238
 239         /* Log the incident to make it more discoverable */
 240         log_warning("Network interface name '%s' has been changed to '%s' to fit length constraints.", ifname, new_ifname);
 241
 242         strcpy(ifname, new_ifname);
 243         return 1;
 244 }
 245
 246 int setup_veth(const char *machine_name,
 247                pid_t pid,
 248                char iface_name[IFNAMSIZ],
 249                bool bridge) {
 250
 251         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 252         struct ether_addr mac_host, mac_container;
 253         unsigned u;
 254         char *n, *a = NULL;
 255         int r;
 256
 257         assert(machine_name);
 258         assert(pid > 0);
 259         assert(iface_name);
 260
 261         /* Use two different interface name prefixes depending whether
 262          * we are in bridge mode or not. */
 263         n = strjoina(bridge ? "vb-" : "ve-", machine_name);
 264         r = shorten_ifname(n);
 265         if (r > 0)
 266                 a = strjoina(bridge ? "vb-" : "ve-", machine_name);
 267
 268         r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0);
 269         if (r < 0)
 270                 return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
 271
 272         r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0);
 273         if (r < 0)
 274                 return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
 275
 276         r = sd_netlink_open(&rtnl);
 277         if (r < 0)
 278                 return log_error_errno(r, "Failed to connect to netlink: %m");
 279
 280         r = add_veth(rtnl, pid, n, a, &mac_host, "host0", &mac_container);
 281         if (r < 0)
 282                 return r;
 283
 284         u = if_nametoindex(n); /* We don't need to use resolve_ifname() here because the
 285                                 * name we assigned is always the main name. */
 286         if (u == 0)
 287                 return log_error_errno(errno, "Failed to resolve interface %s: %m", n);
 288
 289         strcpy(iface_name, n);
 290         return (int) u;
 291 }
 292
 293 int setup_veth_extra(
 294                 const char *machine_name,
 295                 pid_t pid,
 296                 char **pairs) {
 297
 298         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 299         uint64_t idx = 0;
 300         char **a, **b;
 301         int r;
 302
 303         assert(machine_name);
 304         assert(pid > 0);
 305
 306         if (strv_isempty(pairs))
 307                 return 0;
 308
 309         r = sd_netlink_open(&rtnl);
 310         if (r < 0)
 311                 return log_error_errno(r, "Failed to connect to netlink: %m");
 312
 313         STRV_FOREACH_PAIR(a, b, pairs) {
 314                 struct ether_addr mac_host, mac_container;
 315
 316                 r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx);
 317                 if (r < 0)
 318                         return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m");
 319
 320                 r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx);
 321                 if (r < 0)
 322                         return log_error_errno(r, "Failed to generate predictable MAC address for host side of extra veth link: %m");
 323
 324                 r = add_veth(rtnl, pid, *a, NULL, &mac_host, *b, &mac_container);
 325                 if (r < 0)
 326                         return r;
 327
 328                 idx++;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) {
 335         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 336         int r, bridge_ifi;
 337
 338         assert(rtnl);
 339         assert(veth_name);
 340         assert(bridge_name);
 341
 342         bridge_ifi = resolve_interface(&rtnl, bridge_name);
 343         if (bridge_ifi < 0)
 344                 return bridge_ifi;
 345
 346         r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
 347         if (r < 0)
 348                 return r;
 349
 350         r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
 351         if (r < 0)
 352                 return r;
 353
 354         r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name);
 355         if (r < 0)
 356                 return r;
 357
 358         r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi);
 359         if (r < 0)
 360                 return r;
 361
 362         r = sd_netlink_call(rtnl, m, 0, NULL);
 363         if (r < 0)
 364                 return r;
 365
 366         return bridge_ifi;
 367 }
 368
 369 static int create_bridge(sd_netlink *rtnl, const char *bridge_name) {
 370         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 371         int r;
 372
 373         r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 374         if (r < 0)
 375                 return r;
 376
 377         r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name);
 378         if (r < 0)
 379                 return r;
 380
 381         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 382         if (r < 0)
 383                 return r;
 384
 385         r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge");
 386         if (r < 0)
 387                 return r;
 388
 389         r = sd_netlink_message_close_container(m);
 390         if (r < 0)
 391                 return r;
 392
 393         r = sd_netlink_message_close_container(m);
 394         if (r < 0)
 395                 return r;
 396
 397         r = sd_netlink_call(rtnl, m, 0, NULL);
 398         if (r < 0)
 399                 return r;
 400
 401         return 0;
 402 }
 403
 404 int setup_bridge(const char *veth_name, const char *bridge_name, bool create) {
 405         _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT;
 406         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 407         int r, bridge_ifi;
 408         unsigned n = 0;
 409
 410         assert(veth_name);
 411         assert(bridge_name);
 412
 413         r = sd_netlink_open(&rtnl);
 414         if (r < 0)
 415                 return log_error_errno(r, "Failed to connect to netlink: %m");
 416
 417         if (create) {
 418                 /* We take a system-wide lock here, so that we can safely check whether there's still a member in the
 419                  * bridge before removing it, without risking interference from other nspawn instances. */
 420
 421                 r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
 422                 if (r < 0)
 423                         return log_error_errno(r, "Failed to take network zone lock: %m");
 424         }
 425
 426         for (;;) {
 427                 bridge_ifi = join_bridge(rtnl, veth_name, bridge_name);
 428                 if (bridge_ifi >= 0)
 429                         return bridge_ifi;
 430                 if (bridge_ifi != -ENODEV || !create || n > 10)
 431                         return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name);
 432
 433                 /* Count attempts, so that we don't enter an endless loop here. */
 434                 n++;
 435
 436                 /* The bridge doesn't exist yet. Let's create it */
 437                 r = create_bridge(rtnl, bridge_name);
 438                 if (r < 0)
 439                         return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name);
 440
 441                 /* Try again, now that the bridge exists */
 442         }
 443 }
 444
 445 int remove_bridge(const char *bridge_name) {
 446         _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT;
 447         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 448         const char *path;
 449         int r;
 450
 451         /* Removes the specified bridge, but only if it is currently empty */
 452
 453         if (isempty(bridge_name))
 454                 return 0;
 455
 456         r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
 457         if (r < 0)
 458                 return log_error_errno(r, "Failed to take network zone lock: %m");
 459
 460         path = strjoina("/sys/class/net/", bridge_name, "/brif");
 461
 462         r = dir_is_empty(path);
 463         if (r == -ENOENT) /* Already gone? */
 464                 return 0;
 465         if (r < 0)
 466                 return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name);
 467         if (r == 0) /* Still populated, leave it around */
 468                 return 0;
 469
 470         r = sd_netlink_open(&rtnl);
 471         if (r < 0)
 472                 return log_error_errno(r, "Failed to connect to netlink: %m");
 473
 474         return remove_one_link(rtnl, bridge_name);
 475 }
 476
 477 int test_network_interface_initialized(const char *name) {
 478         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 479         int ifi, r;
 480         char ifi_str[2 + DECIMAL_STR_MAX(int)];
 481
 482         if (path_is_read_only_fs("/sys"))
 483                 return 0;
 484
 485         /* udev should be around. */
 486
 487         ifi = resolve_interface_or_warn(NULL, name);
 488         if (ifi < 0)
 489                 return ifi;
 490
 491         sprintf(ifi_str, "n%i", ifi);
 492         r = sd_device_new_from_device_id(&d, ifi_str);
 493         if (r < 0)
 494                 return log_error_errno(r, "Failed to get device %s: %m", name);
 495
 496         r = sd_device_get_is_initialized(d);
 497         if (r < 0)
 498                 return log_error_errno(r, "Failed to determine whether interface %s is initialized: %m", name);
 499         if (r == 0)
 500                 return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Network interface %s is not initialized yet.", name);
 501
 502         r = device_is_renaming(d);
 503         if (r < 0)
 504                 return log_error_errno(r, "Failed to determine the interface %s is being renamed: %m", name);
 505         if (r > 0)
 506                 return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Interface %s is being renamed.", name);
 507
 508         return 0;
 509 }
 510
 511 int move_network_interfaces(int netns_fd, char **ifaces) {
 512         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 513         char **i;
 514         int r;
 515
 516         if (strv_isempty(ifaces))
 517                 return 0;
 518
 519         r = sd_netlink_open(&rtnl);
 520         if (r < 0)
 521                 return log_error_errno(r, "Failed to connect to netlink: %m");
 522
 523         STRV_FOREACH(i, ifaces) {
 524                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 525                 int ifi;
 526
 527                 ifi = resolve_interface_or_warn(&rtnl, *i);
 528                 if (ifi < 0)
 529                         return ifi;
 530
 531                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
 532                 if (r < 0)
 533                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 534
 535                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_FD, netns_fd);
 536                 if (r < 0)
 537                         return log_error_errno(r, "Failed to append namespace fd to netlink message: %m");
 538
 539                 r = sd_netlink_call(rtnl, m, 0, NULL);
 540                 if (r < 0)
 541                         return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
 542         }
 543
 544         return 0;
 545 }
 546
 547 int setup_macvlan(const char *machine_name, pid_t pid, char **ifaces) {
 548         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 549         unsigned idx = 0;
 550         char **i;
 551         int r;
 552
 553         if (strv_isempty(ifaces))
 554                 return 0;
 555
 556         r = sd_netlink_open(&rtnl);
 557         if (r < 0)
 558                 return log_error_errno(r, "Failed to connect to netlink: %m");
 559
 560         STRV_FOREACH(i, ifaces) {
 561                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 562                 _cleanup_free_ char *n = NULL, *a = NULL;
 563                 struct ether_addr mac;
 564                 int ifi;
 565
 566                 ifi = resolve_interface_or_warn(&rtnl, *i);
 567                 if (ifi < 0)
 568                         return ifi;
 569
 570                 r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++);
 571                 if (r < 0)
 572                         return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
 573
 574                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 575                 if (r < 0)
 576                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 577
 578                 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
 579                 if (r < 0)
 580                         return log_error_errno(r, "Failed to add netlink interface index: %m");
 581
 582                 n = strjoin("mv-", *i);
 583                 if (!n)
 584                         return log_oom();
 585
 586                 r = shorten_ifname(n);
 587                 if (r > 0) {
 588                         a = strjoin("mv-", *i);
 589                         if (!a)
 590                                 return log_oom();
 591                 }
 592
 593                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
 594                 if (r < 0)
 595                         return log_error_errno(r, "Failed to add netlink interface name: %m");
 596
 597                 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
 598                 if (r < 0)
 599                         return log_error_errno(r, "Failed to add netlink MAC address: %m");
 600
 601                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
 602                 if (r < 0)
 603                         return log_error_errno(r, "Failed to add netlink namespace field: %m");
 604
 605                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 606                 if (r < 0)
 607                         return log_error_errno(r, "Failed to open netlink container: %m");
 608
 609                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
 610                 if (r < 0)
 611                         return log_error_errno(r, "Failed to open netlink container: %m");
 612
 613                 r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
 614                 if (r < 0)
 615                         return log_error_errno(r, "Failed to append macvlan mode: %m");
 616
 617                 r = sd_netlink_message_close_container(m);
 618                 if (r < 0)
 619                         return log_error_errno(r, "Failed to close netlink container: %m");
 620
 621                 r = sd_netlink_message_close_container(m);
 622                 if (r < 0)
 623                         return log_error_errno(r, "Failed to close netlink container: %m");
 624
 625                 r = sd_netlink_call(rtnl, m, 0, NULL);
 626                 if (r < 0)
 627                         return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
 628
 629                 (void) set_alternative_ifname(rtnl, n, a);
 630         }
 631
 632         return 0;
 633 }
 634
 635 int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces) {
 636         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 637         char **i;
 638         int r;
 639
 640         if (strv_isempty(ifaces))
 641                 return 0;
 642
 643         r = sd_netlink_open(&rtnl);
 644         if (r < 0)
 645                 return log_error_errno(r, "Failed to connect to netlink: %m");
 646
 647         STRV_FOREACH(i, ifaces) {
 648                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 649                 _cleanup_free_ char *n = NULL, *a = NULL;
 650                 int ifi;
 651
 652                 ifi = resolve_interface_or_warn(&rtnl, *i);
 653                 if (ifi < 0)
 654                         return ifi;
 655
 656                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 657                 if (r < 0)
 658                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 659
 660                 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
 661                 if (r < 0)
 662                         return log_error_errno(r, "Failed to add netlink interface index: %m");
 663
 664                 n = strjoin("iv-", *i);
 665                 if (!n)
 666                         return log_oom();
 667
 668                 r = shorten_ifname(n);
 669                 if (r > 0) {
 670                         a = strjoin("iv-", *i);
 671                         if (!a)
 672                                 return log_oom();
 673                 }
 674
 675                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
 676                 if (r < 0)
 677                         return log_error_errno(r, "Failed to add netlink interface name: %m");
 678
 679                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
 680                 if (r < 0)
 681                         return log_error_errno(r, "Failed to add netlink namespace field: %m");
 682
 683                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 684                 if (r < 0)
 685                         return log_error_errno(r, "Failed to open netlink container: %m");
 686
 687                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
 688                 if (r < 0)
 689                         return log_error_errno(r, "Failed to open netlink container: %m");
 690
 691                 r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
 692                 if (r < 0)
 693                         return log_error_errno(r, "Failed to add ipvlan mode: %m");
 694
 695                 r = sd_netlink_message_close_container(m);
 696                 if (r < 0)
 697                         return log_error_errno(r, "Failed to close netlink container: %m");
 698
 699                 r = sd_netlink_message_close_container(m);
 700                 if (r < 0)
 701                         return log_error_errno(r, "Failed to close netlink container: %m");
 702
 703                 r = sd_netlink_call(rtnl, m, 0, NULL);
 704                 if (r < 0)
 705                         return log_error_errno(r, "Failed to add new ipvlan interfaces: %m");
 706
 707                 (void) set_alternative_ifname(rtnl, n, a);
 708         }
 709
 710         return 0;
 711 }
 712
 713 int veth_extra_parse(char ***l, const char *p) {
 714         _cleanup_free_ char *a = NULL, *b = NULL;
 715         int r;
 716
 717         r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
 718         if (r < 0)
 719                 return r;
 720         if (r == 0 || !ifname_valid(a))
 721                 return -EINVAL;
 722
 723         r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
 724         if (r < 0)
 725                 return r;
 726         if (r == 0 || !ifname_valid(b)) {
 727                 free(b);
 728                 b = strdup(a);
 729                 if (!b)
 730                         return -ENOMEM;
 731         }
 732
 733         if (p)
 734                 return -EINVAL;
 735
 736         r = strv_push_pair(l, a, b);
 737         if (r < 0)
 738                 return -ENOMEM;
 739
 740         a = b = NULL;
 741         return 0;
 742 }
 743
 744 int remove_veth_links(const char *primary, char **pairs) {
 745         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 746         char **a, **b;
 747         int r;
 748
 749         /* In some cases the kernel might pin the veth links between host and container even after the namespace
 750          * died. Hence, let's better remove them explicitly too. */
 751
 752         if (isempty(primary) && strv_isempty(pairs))
 753                 return 0;
 754
 755         r = sd_netlink_open(&rtnl);
 756         if (r < 0)
 757                 return log_error_errno(r, "Failed to connect to netlink: %m");
 758
 759         remove_one_link(rtnl, primary);
 760
 761         STRV_FOREACH_PAIR(a, b, pairs)
 762                 remove_one_link(rtnl, *a);
 763
 764         return 0;
 765 }