1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Tom Gundersen <teg@jklm.no>
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include "networkd-netdev.h"
25 #include "network-internal.h"
26 #include "path-util.h"
27 #include "conf-files.h"
28 #include "conf-parser.h"
30 #include "siphash24.h"
32 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
33 [NETDEV_KIND_BRIDGE] = &bridge_vtable,
34 [NETDEV_KIND_BOND] = &bond_vtable,
35 [NETDEV_KIND_VLAN] = &vlan_vtable,
36 [NETDEV_KIND_MACVLAN] = &macvlan_vtable,
37 [NETDEV_KIND_VXLAN] = &vxlan_vtable,
38 [NETDEV_KIND_IPIP] = &ipip_vtable,
39 [NETDEV_KIND_GRE] = &gre_vtable,
40 [NETDEV_KIND_SIT] = &sit_vtable,
41 [NETDEV_KIND_VTI] = &vti_vtable,
42 [NETDEV_KIND_VETH] = &veth_vtable,
43 [NETDEV_KIND_DUMMY] = &dummy_vtable,
44 [NETDEV_KIND_TUN] = &tun_vtable,
45 [NETDEV_KIND_TAP] = &tap_vtable,
48 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
49 [NETDEV_KIND_BRIDGE] = "bridge",
50 [NETDEV_KIND_BOND] = "bond",
51 [NETDEV_KIND_VLAN] = "vlan",
52 [NETDEV_KIND_MACVLAN] = "macvlan",
53 [NETDEV_KIND_VXLAN] = "vxlan",
54 [NETDEV_KIND_IPIP] = "ipip",
55 [NETDEV_KIND_GRE] = "gre",
56 [NETDEV_KIND_SIT] = "sit",
57 [NETDEV_KIND_VETH] = "veth",
58 [NETDEV_KIND_VTI] = "vti",
59 [NETDEV_KIND_DUMMY] = "dummy",
60 [NETDEV_KIND_TUN] = "tun",
61 [NETDEV_KIND_TAP] = "tap",
64 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
65 DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
68 static void netdev_cancel_callbacks(NetDev *netdev) {
69 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
70 netdev_join_callback *callback;
75 rtnl_message_new_synthetic_error(-ENODEV, 0, &m);
77 while ((callback = netdev->callbacks)) {
79 assert(callback->link);
80 assert(callback->callback);
81 assert(netdev->manager);
82 assert(netdev->manager->rtnl);
84 callback->callback(netdev->manager->rtnl, m, link);
87 LIST_REMOVE(callbacks, netdev->callbacks, callback);
92 static void netdev_free(NetDev *netdev) {
96 netdev_cancel_callbacks(netdev);
99 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
101 free(netdev->filename);
103 free(netdev->description);
104 free(netdev->ifname);
107 condition_free_list(netdev->match_host);
108 condition_free_list(netdev->match_virt);
109 condition_free_list(netdev->match_kernel);
110 condition_free_list(netdev->match_arch);
112 if (NETDEV_VTABLE(netdev) &&
113 NETDEV_VTABLE(netdev)->done)
114 NETDEV_VTABLE(netdev)->done(netdev);
119 NetDev *netdev_unref(NetDev *netdev) {
120 if (netdev && (-- netdev->n_ref <= 0))
126 NetDev *netdev_ref(NetDev *netdev) {
128 assert_se(++ netdev->n_ref >= 2);
133 void netdev_drop(NetDev *netdev) {
134 if (!netdev || netdev->state == NETDEV_STATE_LINGER)
137 netdev->state = NETDEV_STATE_LINGER;
139 log_debug_netdev(netdev, "netdev removed");
141 netdev_cancel_callbacks(netdev);
143 netdev_unref(netdev);
148 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
155 netdev = hashmap_get(manager->netdevs, name);
166 static int netdev_enter_failed(NetDev *netdev) {
167 netdev->state = NETDEV_STATE_FAILED;
172 static int netdev_enslave_ready(NetDev *netdev, Link* link, sd_rtnl_message_handler_t callback) {
173 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
177 assert(netdev->state == NETDEV_STATE_READY);
178 assert(netdev->manager);
179 assert(netdev->manager->rtnl);
180 assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND));
184 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req,
185 RTM_SETLINK, link->ifindex);
187 log_error_netdev(netdev,
188 "Could not allocate RTM_SETLINK message: %s",
193 r = sd_rtnl_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
195 log_error_netdev(netdev,
196 "Could not append IFLA_MASTER attribute: %s",
201 r = sd_rtnl_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
203 log_error_netdev(netdev,
204 "Could not send rtnetlink message: %s",
211 log_debug_netdev(netdev, "enslaving link '%s'", link->ifname);
216 static int netdev_enter_ready(NetDev *netdev) {
217 netdev_join_callback *callback, *callback_next;
221 assert(netdev->ifname);
223 if (netdev->state != NETDEV_STATE_CREATING)
226 netdev->state = NETDEV_STATE_READY;
228 log_info_netdev(netdev, "netdev ready");
230 LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
231 /* enslave the links that were attempted to be enslaved before the
233 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
237 LIST_REMOVE(callbacks, netdev->callbacks, callback);
238 link_unref(callback->link);
245 /* callback for netdev's created without a backing Link */
246 static int netdev_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
247 _cleanup_netdev_unref_ NetDev *netdev = userdata;
250 assert(netdev->state != _NETDEV_STATE_INVALID);
252 r = sd_rtnl_message_get_errno(m);
254 log_debug_netdev(netdev, "netdev exists, using existing");
256 log_warning_netdev(netdev, "netdev could not be created: %s", strerror(-r));
262 log_debug_netdev(netdev, "created");
267 int netdev_enslave(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
271 assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND));
273 if (netdev->state == NETDEV_STATE_READY) {
274 r = netdev_enslave_ready(netdev, link, callback);
278 /* the netdev is not yet read, save this request for when it is*/
279 netdev_join_callback *cb;
281 cb = new0(netdev_join_callback, 1);
285 cb->callback = callback;
289 LIST_PREPEND(callbacks, netdev->callbacks, cb);
291 log_debug_netdev(netdev, "will enslave '%s', when reday",
298 int netdev_set_ifindex(NetDev *netdev, sd_rtnl_message *message) {
301 const char *received_kind;
302 const char *received_name;
308 r = sd_rtnl_message_get_type(message, &type);
310 log_error_netdev(netdev, "Could not get rtnl message type");
314 if (type != RTM_NEWLINK) {
315 log_error_netdev(netdev, "Can not set ifindex from unexpected rtnl message type");
319 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
321 log_error_netdev(netdev, "Could not get ifindex: %s", strerror(-r));
322 netdev_enter_failed(netdev);
324 } else if (ifindex <= 0) {
325 log_error_netdev(netdev, "Got invalid ifindex: %d", ifindex);
326 netdev_enter_failed(netdev);
330 if (netdev->ifindex > 0) {
331 if (netdev->ifindex != ifindex) {
332 log_error_netdev(netdev, "Could not set ifindex to %d, already set to %d",
333 ifindex, netdev->ifindex);
334 netdev_enter_failed(netdev);
337 /* ifindex already set to the same for this netdev */
341 r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &received_name);
343 log_error_netdev(netdev, "Could not get IFNAME");
347 if (!streq(netdev->ifname, received_name)) {
348 log_error_netdev(netdev, "Received newlink with wrong IFNAME %s",
350 netdev_enter_failed(netdev);
354 r = sd_rtnl_message_enter_container(message, IFLA_LINKINFO);
356 log_error_netdev(netdev, "Could not get LINKINFO");
360 r = sd_rtnl_message_read_string(message, IFLA_INFO_KIND, &received_kind);
362 log_error_netdev(netdev, "Could not get KIND");
366 r = sd_rtnl_message_exit_container(message);
368 log_error_netdev(netdev, "Could not exit container");
372 if (netdev->kind == NETDEV_KIND_TAP)
373 /* the kernel does not distinguish between tun and tap */
376 kind = netdev_kind_to_string(netdev->kind);
378 log_error_netdev(netdev, "Could not get kind");
379 netdev_enter_failed(netdev);
384 if (!streq(kind, received_kind)) {
385 log_error_netdev(netdev,
386 "Received newlink with wrong KIND %s, "
387 "expected %s", received_kind, kind);
388 netdev_enter_failed(netdev);
392 netdev->ifindex = ifindex;
394 log_debug_netdev(netdev, "netdev has index %d", netdev->ifindex);
396 netdev_enter_ready(netdev);
401 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
403 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
404 _cleanup_free_ struct ether_addr *mac = NULL;
413 mac = new0(struct ether_addr, 1);
418 sz = sizeof(sd_id128_t) + l;
421 /* fetch some persistent data unique to the machine */
422 r = sd_id128_get_machine((sd_id128_t*) v);
426 /* combine with some data unique (on this machine) to this
428 memcpy(v + sizeof(sd_id128_t), ifname, l);
430 /* Let's hash the host machine ID plus the container name. We
431 * use a fixed, but originally randomly created hash key here. */
432 siphash24(result, v, sz, HASH_KEY.bytes);
434 assert_cc(ETH_ALEN <= sizeof(result));
435 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
437 /* see eth_random_addr in the kernel */
438 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
439 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
447 static int netdev_create(NetDev *netdev, Link *link) {
453 if (NETDEV_VTABLE(netdev)->create) {
454 r = NETDEV_VTABLE(netdev)->create(netdev);
458 log_debug_netdev(netdev, "created");
460 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
462 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
464 log_error_netdev(netdev,
465 "Could not allocate RTM_NEWLINK message: %s",
470 r = sd_rtnl_message_append_string(m, IFLA_IFNAME, netdev->ifname);
472 log_error_netdev(netdev,
473 "Could not append IFLA_IFNAME, attribute: %s",
479 r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
481 log_error_netdev(netdev,
482 "Could not append IFLA_ADDRESS attribute: %s",
489 r = sd_rtnl_message_append_u32(m, IFLA_MTU, netdev->mtu);
491 log_error_netdev(netdev,
492 "Could not append IFLA_MTU attribute: %s",
499 r = sd_rtnl_message_append_u32(m, IFLA_LINK, link->ifindex);
501 log_error_netdev(netdev,
502 "Colud not append IFLA_LINK attribute: %s",
508 r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
510 log_error_netdev(netdev,
511 "Could not append IFLA_LINKINFO attribute: %s",
516 r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA,
517 netdev_kind_to_string(netdev->kind));
519 log_error_netdev(netdev,
520 "Could not append IFLA_INFO_DATA attribute: %s",
525 if (NETDEV_VTABLE(netdev)->fill_message_create) {
526 r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
531 r = sd_rtnl_message_close_container(m);
533 log_error_netdev(netdev,
534 "Could not append IFLA_LINKINFO attribute: %s",
539 r = sd_rtnl_message_close_container(m);
541 log_error_netdev(netdev,
542 "Could not append IFLA_LINKINFO attribute: %s",
548 r = sd_rtnl_call_async(netdev->manager->rtnl, m, netdev_create_handler, netdev, 0, NULL);
550 log_error_netdev(netdev,
551 "Could not send rtnetlink message: %s", strerror(-r));
557 netdev->state = NETDEV_STATE_CREATING;
559 log_debug_netdev(netdev, "creating");
565 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
566 int netdev_join(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
570 assert(netdev->manager);
571 assert(netdev->manager->rtnl);
572 assert(NETDEV_VTABLE(netdev));
574 switch (NETDEV_VTABLE(netdev)->create_type) {
575 case NETDEV_CREATE_MASTER:
576 r = netdev_enslave(netdev, link, callback);
581 case NETDEV_CREATE_STACKED:
582 r = netdev_create(netdev, link);
588 assert_not_reached("Can not join independent netdev");
594 static int netdev_load_one(Manager *manager, const char *filename) {
595 _cleanup_netdev_unref_ NetDev *netdev = NULL;
596 _cleanup_free_ NetDev *netdev_raw = NULL;
597 _cleanup_fclose_ FILE *file = NULL;
603 file = fopen(filename, "re");
611 if (null_or_empty_fd(fileno(file))) {
612 log_debug("Skipping empty file: %s", filename);
616 netdev_raw = new0(NetDev, 1);
620 netdev_raw->kind = _NETDEV_KIND_INVALID;
622 r = config_parse(NULL, filename, file,
624 config_item_perf_lookup, network_netdev_gperf_lookup,
625 true, false, true, netdev_raw);
629 r = fseek(file, 0, SEEK_SET);
633 /* skip out early if configuration does not match the environment */
634 if (net_match_config(NULL, NULL, NULL, NULL, NULL,
635 netdev_raw->match_host, netdev_raw->match_virt,
636 netdev_raw->match_kernel, netdev_raw->match_arch,
637 NULL, NULL, NULL, NULL, NULL, NULL) <= 0)
640 if (!NETDEV_VTABLE(netdev_raw)) {
641 log_warning("NetDev with invalid Kind configured in %s. Ignoring", filename);
645 if (!netdev_raw->ifname) {
646 log_warning("NetDev without Name configured in %s. Ignoring", filename);
650 netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
655 netdev->manager = manager;
656 netdev->state = _NETDEV_STATE_INVALID;
657 netdev->kind = netdev_raw->kind;
658 netdev->ifname = netdev_raw->ifname;
660 if (NETDEV_VTABLE(netdev)->init)
661 NETDEV_VTABLE(netdev)->init(netdev);
663 r = config_parse(NULL, filename, file,
664 NETDEV_VTABLE(netdev)->sections,
665 config_item_perf_lookup, network_netdev_gperf_lookup,
666 false, false, false, netdev);
670 /* verify configuration */
671 if (NETDEV_VTABLE(netdev)->config_verify) {
672 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
677 netdev->filename = strdup(filename);
678 if (!netdev->filename)
682 r = netdev_get_mac(netdev->ifname, &netdev->mac);
684 log_error("Failed to generate predictable MAC address for %s",
690 r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
694 LIST_HEAD_INIT(netdev->callbacks);
696 log_debug_netdev(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
698 switch (NETDEV_VTABLE(netdev)->create_type) {
699 case NETDEV_CREATE_MASTER:
700 case NETDEV_CREATE_INDEPENDENT:
701 r = netdev_create(netdev, NULL);
715 int netdev_load(Manager *manager) {
722 while ((netdev = hashmap_first(manager->netdevs)))
723 netdev_unref(netdev);
725 r = conf_files_list_strv(&files, ".netdev", NULL, network_dirs);
727 log_error("Failed to enumerate netdev files: %s", strerror(-r));
731 STRV_FOREACH_BACKWARDS(f, files) {
732 r = netdev_load_one(manager, *f);