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 "lock-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
  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 static int shorten_ifname(char *ifname) {
 204         char new_ifname[IFNAMSIZ];
 205
 206         assert(ifname);
 207
 208         if (strlen(ifname) < IFNAMSIZ) /* Name is short enough */
 209                 return 0;
 210
 211         if (naming_scheme_has(NAMING_NSPAWN_LONG_HASH)) {
 212                 uint64_t h;
 213
 214                 /* Calculate 64-bit hash value */
 215                 h = siphash24(ifname, strlen(ifname), SHORTEN_IFNAME_HASH_KEY.bytes);
 216
 217                 /* Set the final four bytes (i.e. 32-bit) to the lower 24bit of the hash, encoded in url-safe base64 */
 218                 memcpy(new_ifname, ifname, IFNAMSIZ - 5);
 219                 new_ifname[IFNAMSIZ - 5] = urlsafe_base64char(h >> 18);
 220                 new_ifname[IFNAMSIZ - 4] = urlsafe_base64char(h >> 12);
 221                 new_ifname[IFNAMSIZ - 3] = urlsafe_base64char(h >> 6);
 222                 new_ifname[IFNAMSIZ - 2] = urlsafe_base64char(h);
 223         } else
 224                 /* On old nspawn versions we just truncated the name, provide compatibility */
 225                 memcpy(new_ifname, ifname, IFNAMSIZ-1);
 226
 227         new_ifname[IFNAMSIZ - 1] = 0;
 228
 229         /* Log the incident to make it more discoverable */
 230         log_warning("Network interface name '%s' has been changed to '%s' to fit length constraints.", ifname, new_ifname);
 231
 232         strcpy(ifname, new_ifname);
 233         return 1;
 234 }
 235
 236 int setup_veth(const char *machine_name,
 237                pid_t pid,
 238                char iface_name[IFNAMSIZ],
 239                bool bridge) {
 240
 241         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 242         struct ether_addr mac_host, mac_container;
 243         unsigned u;
 244         char *n, *a = NULL;
 245         int r;
 246
 247         assert(machine_name);
 248         assert(pid > 0);
 249         assert(iface_name);
 250
 251         /* Use two different interface name prefixes depending whether
 252          * we are in bridge mode or not. */
 253         n = strjoina(bridge ? "vb-" : "ve-", machine_name);
 254         r = shorten_ifname(n);
 255         if (r > 0)
 256                 a = strjoina(bridge ? "vb-" : "ve-", machine_name);
 257
 258         r = generate_mac(machine_name, &mac_container, CONTAINER_HASH_KEY, 0);
 259         if (r < 0)
 260                 return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
 261
 262         r = generate_mac(machine_name, &mac_host, HOST_HASH_KEY, 0);
 263         if (r < 0)
 264                 return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
 265
 266         r = sd_netlink_open(&rtnl);
 267         if (r < 0)
 268                 return log_error_errno(r, "Failed to connect to netlink: %m");
 269
 270         r = add_veth(rtnl, pid, n, a, &mac_host, "host0", &mac_container);
 271         if (r < 0)
 272                 return r;
 273
 274         u = if_nametoindex(n); /* We don't need to use rtnl_resolve_ifname() here because the
 275                                 * name we assigned is always the main name. */
 276         if (u == 0)
 277                 return log_error_errno(errno, "Failed to resolve interface %s: %m", n);
 278
 279         strcpy(iface_name, n);
 280         return (int) u;
 281 }
 282
 283 int setup_veth_extra(
 284                 const char *machine_name,
 285                 pid_t pid,
 286                 char **pairs) {
 287
 288         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 289         uint64_t idx = 0;
 290         int r;
 291
 292         assert(machine_name);
 293         assert(pid > 0);
 294
 295         if (strv_isempty(pairs))
 296                 return 0;
 297
 298         r = sd_netlink_open(&rtnl);
 299         if (r < 0)
 300                 return log_error_errno(r, "Failed to connect to netlink: %m");
 301
 302         STRV_FOREACH_PAIR(a, b, pairs) {
 303                 struct ether_addr mac_host, mac_container;
 304
 305                 r = generate_mac(machine_name, &mac_container, VETH_EXTRA_CONTAINER_HASH_KEY, idx);
 306                 if (r < 0)
 307                         return log_error_errno(r, "Failed to generate predictable MAC address for container side of extra veth link: %m");
 308
 309                 r = generate_mac(machine_name, &mac_host, VETH_EXTRA_HOST_HASH_KEY, idx);
 310                 if (r < 0)
 311                         return log_error_errno(r, "Failed to generate predictable MAC address for host side of extra veth link: %m");
 312
 313                 r = add_veth(rtnl, pid, *a, NULL, &mac_host, *b, &mac_container);
 314                 if (r < 0)
 315                         return r;
 316
 317                 idx++;
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int join_bridge(sd_netlink *rtnl, const char *veth_name, const char *bridge_name) {
 324         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 325         int r, bridge_ifi;
 326
 327         assert(rtnl);
 328         assert(veth_name);
 329         assert(bridge_name);
 330
 331         bridge_ifi = rtnl_resolve_interface(&rtnl, bridge_name);
 332         if (bridge_ifi < 0)
 333                 return bridge_ifi;
 334
 335         r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
 336         if (r < 0)
 337                 return r;
 338
 339         r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
 340         if (r < 0)
 341                 return r;
 342
 343         r = sd_netlink_message_append_string(m, IFLA_IFNAME, veth_name);
 344         if (r < 0)
 345                 return r;
 346
 347         r = sd_netlink_message_append_u32(m, IFLA_MASTER, bridge_ifi);
 348         if (r < 0)
 349                 return r;
 350
 351         r = sd_netlink_call(rtnl, m, 0, NULL);
 352         if (r < 0)
 353                 return r;
 354
 355         return bridge_ifi;
 356 }
 357
 358 static int create_bridge(sd_netlink *rtnl, const char *bridge_name) {
 359         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 360         int r;
 361
 362         r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 363         if (r < 0)
 364                 return r;
 365
 366         r = sd_netlink_message_append_string(m, IFLA_IFNAME, bridge_name);
 367         if (r < 0)
 368                 return r;
 369
 370         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 371         if (r < 0)
 372                 return r;
 373
 374         r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "bridge");
 375         if (r < 0)
 376                 return r;
 377
 378         r = sd_netlink_message_close_container(m);
 379         if (r < 0)
 380                 return r;
 381
 382         r = sd_netlink_message_close_container(m);
 383         if (r < 0)
 384                 return r;
 385
 386         r = sd_netlink_call(rtnl, m, 0, NULL);
 387         if (r < 0)
 388                 return r;
 389
 390         return 0;
 391 }
 392
 393 int setup_bridge(const char *veth_name, const char *bridge_name, bool create) {
 394         _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT;
 395         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 396         int r, bridge_ifi;
 397         unsigned n = 0;
 398
 399         assert(veth_name);
 400         assert(bridge_name);
 401
 402         r = sd_netlink_open(&rtnl);
 403         if (r < 0)
 404                 return log_error_errno(r, "Failed to connect to netlink: %m");
 405
 406         if (create) {
 407                 /* We take a system-wide lock here, so that we can safely check whether there's still a member in the
 408                  * bridge before removing it, without risking interference from other nspawn instances. */
 409
 410                 r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
 411                 if (r < 0)
 412                         return log_error_errno(r, "Failed to take network zone lock: %m");
 413         }
 414
 415         for (;;) {
 416                 bridge_ifi = join_bridge(rtnl, veth_name, bridge_name);
 417                 if (bridge_ifi >= 0)
 418                         return bridge_ifi;
 419                 if (bridge_ifi != -ENODEV || !create || n > 10)
 420                         return log_error_errno(bridge_ifi, "Failed to add interface %s to bridge %s: %m", veth_name, bridge_name);
 421
 422                 /* Count attempts, so that we don't enter an endless loop here. */
 423                 n++;
 424
 425                 /* The bridge doesn't exist yet. Let's create it */
 426                 r = create_bridge(rtnl, bridge_name);
 427                 if (r < 0)
 428                         return log_error_errno(r, "Failed to create bridge interface %s: %m", bridge_name);
 429
 430                 /* Try again, now that the bridge exists */
 431         }
 432 }
 433
 434 int remove_bridge(const char *bridge_name) {
 435         _cleanup_(release_lock_file) LockFile bridge_lock = LOCK_FILE_INIT;
 436         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 437         const char *path;
 438         int r;
 439
 440         /* Removes the specified bridge, but only if it is currently empty */
 441
 442         if (isempty(bridge_name))
 443                 return 0;
 444
 445         r = make_lock_file("/run/systemd/nspawn-network-zone", LOCK_EX, &bridge_lock);
 446         if (r < 0)
 447                 return log_error_errno(r, "Failed to take network zone lock: %m");
 448
 449         path = strjoina("/sys/class/net/", bridge_name, "/brif");
 450
 451         r = dir_is_empty(path, /* ignore_hidden_or_backup= */ false);
 452         if (r == -ENOENT) /* Already gone? */
 453                 return 0;
 454         if (r < 0)
 455                 return log_error_errno(r, "Can't detect if bridge %s is empty: %m", bridge_name);
 456         if (r == 0) /* Still populated, leave it around */
 457                 return 0;
 458
 459         r = sd_netlink_open(&rtnl);
 460         if (r < 0)
 461                 return log_error_errno(r, "Failed to connect to netlink: %m");
 462
 463         return remove_one_link(rtnl, bridge_name);
 464 }
 465
 466 static int test_network_interface_initialized(const char *name) {
 467         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 468         int r;
 469
 470         if (!udev_available())
 471                 return 0;
 472
 473         /* udev should be around. */
 474
 475         r = sd_device_new_from_ifname(&d, name);
 476         if (r < 0)
 477                 return log_error_errno(r, "Failed to get device %s: %m", name);
 478
 479         r = sd_device_get_is_initialized(d);
 480         if (r < 0)
 481                 return log_error_errno(r, "Failed to determine whether interface %s is initialized: %m", name);
 482         if (r == 0)
 483                 return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Network interface %s is not initialized yet.", name);
 484
 485         r = device_is_renaming(d);
 486         if (r < 0)
 487                 return log_error_errno(r, "Failed to determine the interface %s is being renamed: %m", name);
 488         if (r > 0)
 489                 return log_error_errno(SYNTHETIC_ERRNO(EBUSY), "Interface %s is being renamed.", name);
 490
 491         return 0;
 492 }
 493
 494 int test_network_interfaces_initialized(char **iface_pairs) {
 495         int r;
 496         STRV_FOREACH_PAIR(a, b, iface_pairs) {
 497                 r = test_network_interface_initialized(*a);
 498                 if (r < 0)
 499                         return r;
 500         }
 501         return 0;
 502 }
 503
 504 int move_network_interfaces(int netns_fd, char **iface_pairs) {
 505         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 506         int r;
 507
 508         if (strv_isempty(iface_pairs))
 509                 return 0;
 510
 511         r = sd_netlink_open(&rtnl);
 512         if (r < 0)
 513                 return log_error_errno(r, "Failed to connect to netlink: %m");
 514
 515         STRV_FOREACH_PAIR(i, b, iface_pairs) {
 516                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 517                 int ifi;
 518
 519                 ifi = rtnl_resolve_interface_or_warn(&rtnl, *i);
 520                 if (ifi < 0)
 521                         return ifi;
 522
 523                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
 524                 if (r < 0)
 525                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 526
 527                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_FD, netns_fd);
 528                 if (r < 0)
 529                         return log_error_errno(r, "Failed to append namespace fd to netlink message: %m");
 530
 531                 if (!streq(*b, *i)) {
 532                         r = sd_netlink_message_append_string(m, IFLA_IFNAME, *b);
 533                         if (r < 0)
 534                                 return log_error_errno(r, "Failed to add netlink interface name: %m");
 535                 }
 536
 537                 r = sd_netlink_call(rtnl, m, 0, NULL);
 538                 if (r < 0)
 539                         return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
 540         }
 541
 542         return 0;
 543 }
 544
 545 int setup_macvlan(const char *machine_name, pid_t pid, char **iface_pairs) {
 546         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 547         unsigned idx = 0;
 548         int r;
 549
 550         if (strv_isempty(iface_pairs))
 551                 return 0;
 552
 553         r = sd_netlink_open(&rtnl);
 554         if (r < 0)
 555                 return log_error_errno(r, "Failed to connect to netlink: %m");
 556
 557         STRV_FOREACH_PAIR(i, b, iface_pairs) {
 558                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 559                 _cleanup_free_ char *n = NULL;
 560                 int shortened, ifi;
 561                 struct ether_addr mac;
 562
 563                 ifi = rtnl_resolve_interface_or_warn(&rtnl, *i);
 564                 if (ifi < 0)
 565                         return ifi;
 566
 567                 r = generate_mac(machine_name, &mac, MACVLAN_HASH_KEY, idx++);
 568                 if (r < 0)
 569                         return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
 570
 571                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 572                 if (r < 0)
 573                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 574
 575                 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
 576                 if (r < 0)
 577                         return log_error_errno(r, "Failed to add netlink interface index: %m");
 578
 579                 n = strdup(*b);
 580                 if (!n)
 581                         return log_oom();
 582
 583                 shortened = shorten_ifname(n);
 584
 585                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
 586                 if (r < 0)
 587                         return log_error_errno(r, "Failed to add netlink interface name: %m");
 588
 589                 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
 590                 if (r < 0)
 591                         return log_error_errno(r, "Failed to add netlink MAC address: %m");
 592
 593                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
 594                 if (r < 0)
 595                         return log_error_errno(r, "Failed to add netlink namespace field: %m");
 596
 597                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 598                 if (r < 0)
 599                         return log_error_errno(r, "Failed to open netlink container: %m");
 600
 601                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
 602                 if (r < 0)
 603                         return log_error_errno(r, "Failed to open netlink container: %m");
 604
 605                 r = sd_netlink_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
 606                 if (r < 0)
 607                         return log_error_errno(r, "Failed to append macvlan mode: %m");
 608
 609                 r = sd_netlink_message_close_container(m);
 610                 if (r < 0)
 611                         return log_error_errno(r, "Failed to close netlink container: %m");
 612
 613                 r = sd_netlink_message_close_container(m);
 614                 if (r < 0)
 615                         return log_error_errno(r, "Failed to close netlink container: %m");
 616
 617                 r = sd_netlink_call(rtnl, m, 0, NULL);
 618                 if (r < 0)
 619                         return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
 620
 621                 if (shortened > 0)
 622                         (void) set_alternative_ifname(rtnl, n, *b);
 623         }
 624
 625         return 0;
 626 }
 627
 628 int setup_ipvlan(const char *machine_name, pid_t pid, char **iface_pairs) {
 629         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 630         int r;
 631
 632         if (strv_isempty(iface_pairs))
 633                 return 0;
 634
 635         r = sd_netlink_open(&rtnl);
 636         if (r < 0)
 637                 return log_error_errno(r, "Failed to connect to netlink: %m");
 638
 639         STRV_FOREACH_PAIR(i, b, iface_pairs) {
 640                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 641                 _cleanup_free_ char *n = NULL;
 642                 int shortened, ifi ;
 643
 644                 ifi = rtnl_resolve_interface_or_warn(&rtnl, *i);
 645                 if (ifi < 0)
 646                         return ifi;
 647
 648                 r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
 649                 if (r < 0)
 650                         return log_error_errno(r, "Failed to allocate netlink message: %m");
 651
 652                 r = sd_netlink_message_append_u32(m, IFLA_LINK, ifi);
 653                 if (r < 0)
 654                         return log_error_errno(r, "Failed to add netlink interface index: %m");
 655
 656                 n = strdup(*b);
 657                 if (!n)
 658                         return log_oom();
 659
 660                 shortened = shorten_ifname(n);
 661
 662                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, n);
 663                 if (r < 0)
 664                         return log_error_errno(r, "Failed to add netlink interface name: %m");
 665
 666                 r = sd_netlink_message_append_u32(m, IFLA_NET_NS_PID, pid);
 667                 if (r < 0)
 668                         return log_error_errno(r, "Failed to add netlink namespace field: %m");
 669
 670                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 671                 if (r < 0)
 672                         return log_error_errno(r, "Failed to open netlink container: %m");
 673
 674                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, "ipvlan");
 675                 if (r < 0)
 676                         return log_error_errno(r, "Failed to open netlink container: %m");
 677
 678                 r = sd_netlink_message_append_u16(m, IFLA_IPVLAN_MODE, IPVLAN_MODE_L2);
 679                 if (r < 0)
 680                         return log_error_errno(r, "Failed to add ipvlan mode: %m");
 681
 682                 r = sd_netlink_message_close_container(m);
 683                 if (r < 0)
 684                         return log_error_errno(r, "Failed to close netlink container: %m");
 685
 686                 r = sd_netlink_message_close_container(m);
 687                 if (r < 0)
 688                         return log_error_errno(r, "Failed to close netlink container: %m");
 689
 690                 r = sd_netlink_call(rtnl, m, 0, NULL);
 691                 if (r < 0)
 692                         return log_error_errno(r, "Failed to add new ipvlan interfaces: %m");
 693
 694                 if (shortened > 0)
 695                         (void) set_alternative_ifname(rtnl, n, *b);
 696         }
 697
 698         return 0;
 699 }
 700
 701 int veth_extra_parse(char ***l, const char *p) {
 702         _cleanup_free_ char *a = NULL, *b = NULL;
 703         int r;
 704
 705         r = extract_first_word(&p, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
 706         if (r < 0)
 707                 return r;
 708         if (r == 0 || !ifname_valid(a))
 709                 return -EINVAL;
 710
 711         r = extract_first_word(&p, &b, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
 712         if (r < 0)
 713                 return r;
 714         if (r == 0 || !ifname_valid(b)) {
 715                 r = free_and_strdup(&b, a);
 716                 if (r < 0)
 717                         return r;
 718         }
 719
 720         if (p)
 721                 return -EINVAL;
 722
 723         r = strv_push_pair(l, a, b);
 724         if (r < 0)
 725                 return -ENOMEM;
 726
 727         a = b = NULL;
 728         return 0;
 729 }
 730
 731 int remove_veth_links(const char *primary, char **pairs) {
 732         _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
 733         int r;
 734
 735         /* In some cases the kernel might pin the veth links between host and container even after the namespace
 736          * died. Hence, let's better remove them explicitly too. */
 737
 738         if (isempty(primary) && strv_isempty(pairs))
 739                 return 0;
 740
 741         r = sd_netlink_open(&rtnl);
 742         if (r < 0)
 743                 return log_error_errno(r, "Failed to connect to netlink: %m");
 744
 745         remove_one_link(rtnl, primary);
 746
 747         STRV_FOREACH_PAIR(a, b, pairs)
 748                 remove_one_link(rtnl, *a);
 749
 750         return 0;
 751 }
 752
 753 static int network_iface_pair_parse(const char* iftype, char ***l, const char *p, const char* ifprefix) {
 754         int r;
 755
 756         for (;;) {
 757                 _cleanup_free_ char *word = NULL, *a = NULL, *b = NULL;
 758                 const char *interface;
 759
 760                 r = extract_first_word(&p, &word, NULL, 0);
 761                 if (r < 0)
 762                         return log_error_errno(r, "Failed to parse interface name: %m");
 763                 if (r == 0)
 764                         break;
 765
 766                 interface = word;
 767                 r = extract_first_word(&interface, &a, ":", EXTRACT_DONT_COALESCE_SEPARATORS);
 768                 if (r < 0)
 769                         return log_error_errno(r, "Failed to extract first word in %s parameter: %m", iftype);
 770                 if (r == 0)
 771                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 772                                                "Short read while reading %s parameter: %m", iftype);
 773                 if (!ifname_valid(a))
 774                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 775                                                "%s, interface name not valid: %s", iftype, a);
 776
 777                 if (isempty(interface)) {
 778                         if (ifprefix)
 779                                 b = strjoin(ifprefix, a);
 780                         else
 781                                 b = strdup(a);
 782                 } else
 783                         b = strdup(interface);
 784                 if (!b)
 785                         return log_oom();
 786
 787                 if (!ifname_valid(b))
 788                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
 789                                                "%s, interface name not valid: %s", iftype, b);
 790
 791                 r = strv_consume_pair(l, TAKE_PTR(a), TAKE_PTR(b));
 792                 if (r < 0)
 793                         return log_oom();
 794         }
 795
 796         return 0;
 797 }
 798
 799 int interface_pair_parse(char ***l, const char *p) {
 800         return network_iface_pair_parse("Network interface", l, p, NULL);
 801 }
 802
 803 int macvlan_pair_parse(char ***l, const char *p) {
 804         return network_iface_pair_parse("MACVLAN network interface", l, p, "mv-");
 805 }
 806
 807 int ipvlan_pair_parse(char ***l, const char *p) {
 808         return network_iface_pair_parse("IPVLAN network interface", l, p, "iv-");
 809 }