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/>.
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 #define VLANID_MAX 4094
34 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
35 [NETDEV_KIND_BRIDGE] = "bridge",
36 [NETDEV_KIND_BOND] = "bond",
37 [NETDEV_KIND_VLAN] = "vlan",
38 [NETDEV_KIND_MACVLAN] = "macvlan",
39 [NETDEV_KIND_VXLAN] = "vxlan",
40 [NETDEV_KIND_IPIP] = "ipip",
41 [NETDEV_KIND_GRE] = "gre",
42 [NETDEV_KIND_SIT] = "sit",
43 [NETDEV_KIND_VETH] = "veth",
44 [NETDEV_KIND_VTI] = "vti"
47 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
48 DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
50 static const char* const macvlan_mode_table[_NETDEV_MACVLAN_MODE_MAX] = {
51 [NETDEV_MACVLAN_MODE_PRIVATE] = "private",
52 [NETDEV_MACVLAN_MODE_VEPA] = "vepa",
53 [NETDEV_MACVLAN_MODE_BRIDGE] = "bridge",
54 [NETDEV_MACVLAN_MODE_PASSTHRU] = "passthru",
57 DEFINE_STRING_TABLE_LOOKUP(macvlan_mode, MacVlanMode);
58 DEFINE_CONFIG_PARSE_ENUM(config_parse_macvlan_mode, macvlan_mode, MacVlanMode, "Failed to parse macvlan mode");
60 static void netdev_cancel_callbacks(NetDev *netdev) {
61 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
62 netdev_enslave_callback *callback;
67 rtnl_message_new_synthetic_error(-ENODEV, 0, &m);
69 while ((callback = netdev->callbacks)) {
71 assert(callback->link);
72 assert(callback->callback);
73 assert(netdev->manager);
74 assert(netdev->manager->rtnl);
76 callback->callback(netdev->manager->rtnl, m, link);
79 LIST_REMOVE(callbacks, netdev->callbacks, callback);
84 static void netdev_free(NetDev *netdev) {
88 netdev_cancel_callbacks(netdev);
91 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
93 free(netdev->filename);
95 free(netdev->description);
97 free(netdev->ifname_peer);
99 free(netdev->mac_peer);
101 condition_free_list(netdev->match_host);
102 condition_free_list(netdev->match_virt);
103 condition_free_list(netdev->match_kernel);
104 condition_free_list(netdev->match_arch);
109 NetDev *netdev_unref(NetDev *netdev) {
110 if (netdev && (-- netdev->n_ref <= 0))
116 NetDev *netdev_ref(NetDev *netdev) {
118 assert_se(++ netdev->n_ref >= 2);
123 void netdev_drop(NetDev *netdev) {
124 if (!netdev || netdev->state == NETDEV_STATE_LINGER)
127 netdev->state = NETDEV_STATE_LINGER;
129 log_debug_netdev(netdev, "netdev removed");
131 netdev_cancel_callbacks(netdev);
133 netdev_unref(netdev);
138 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
145 netdev = hashmap_get(manager->netdevs, name);
156 static int netdev_enter_failed(NetDev *netdev) {
157 netdev->state = NETDEV_STATE_FAILED;
162 static int netdev_enslave_ready(NetDev *netdev, Link* link, sd_rtnl_message_handler_t callback) {
163 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
167 assert(netdev->state == NETDEV_STATE_READY);
168 assert(netdev->manager);
169 assert(netdev->manager->rtnl);
173 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req,
174 RTM_SETLINK, link->ifindex);
176 log_error_netdev(netdev,
177 "Could not allocate RTM_SETLINK message: %s",
182 r = sd_rtnl_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
184 log_error_netdev(netdev,
185 "Could not append IFLA_MASTER attribute: %s",
190 r = sd_rtnl_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
192 log_error_netdev(netdev,
193 "Could not send rtnetlink message: %s",
198 log_debug_netdev(netdev, "enslaving link '%s'", link->ifname);
203 static int netdev_enter_ready(NetDev *netdev) {
204 netdev_enslave_callback *callback;
207 assert(netdev->ifname);
209 if (netdev->state != NETDEV_STATE_CREATING)
212 netdev->state = NETDEV_STATE_READY;
214 log_info_netdev(netdev, "netdev ready");
216 LIST_FOREACH(callbacks, callback, netdev->callbacks) {
217 /* enslave the links that were attempted to be enslaved before the
219 netdev_enslave_ready(netdev, callback->link, callback->callback);
225 /* callback for netdev's created without a backing Link */
226 static int netdev_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
227 NetDev *netdev = userdata;
230 assert(netdev->state != _NETDEV_STATE_INVALID);
232 r = sd_rtnl_message_get_errno(m);
234 log_debug_netdev(netdev, "netdev exists, using existing");
236 log_warning_netdev(netdev, "netdev could not be created: %s", strerror(-r));
245 int config_parse_tunnel_address(const char *unit,
246 const char *filename,
249 unsigned section_line,
256 unsigned char family = AF_INET;
264 r = net_parse_inaddr(rvalue, &family, n);
266 log_syntax(unit, LOG_ERR, filename, line, EINVAL,
267 "Tunnel address is invalid, ignoring assignment: %s", rvalue);
273 static int netdev_create(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
274 _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
279 assert(!(netdev->kind == NETDEV_KIND_VLAN || netdev->kind == NETDEV_KIND_MACVLAN) ||
281 assert(netdev->ifname);
282 assert(netdev->manager);
283 assert(netdev->manager->rtnl);
285 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_NEWLINK, 0);
287 log_error_netdev(netdev,
288 "Could not allocate RTM_NEWLINK message: %s",
294 r = sd_rtnl_message_append_u32(req, IFLA_LINK, link->ifindex);
296 log_error_netdev(netdev,
297 "Could not append IFLA_LINK attribute: %s",
303 r = sd_rtnl_message_append_string(req, IFLA_IFNAME, netdev->ifname);
305 log_error_netdev(netdev,
306 "Could not append IFLA_IFNAME attribute: %s",
312 r = sd_rtnl_message_append_u32(req, IFLA_MTU, netdev->mtu);
314 log_error_netdev(netdev,
315 "Could not append IFLA_MTU attribute: %s",
322 r = sd_rtnl_message_append_ether_addr(req, IFLA_ADDRESS, netdev->mac);
324 log_error_netdev(netdev,
325 "Colud not append IFLA_ADDRESS attribute: %s",
331 r = sd_rtnl_message_open_container(req, IFLA_LINKINFO);
333 log_error_netdev(netdev,
334 "Could not open IFLA_LINKINFO container: %s",
339 kind = netdev_kind_to_string(netdev->kind);
341 log_error_netdev(netdev, "Invalid kind");
345 r = sd_rtnl_message_open_container_union(req, IFLA_INFO_DATA, kind);
347 log_error_netdev(netdev,
348 "Could not open IFLA_INFO_DATA container: %s",
353 if (netdev->vlanid <= VLANID_MAX) {
354 r = sd_rtnl_message_append_u16(req, IFLA_VLAN_ID, netdev->vlanid);
356 log_error_netdev(netdev,
357 "Could not append IFLA_VLAN_ID attribute: %s",
363 if (netdev->macvlan_mode != _NETDEV_MACVLAN_MODE_INVALID) {
364 r = sd_rtnl_message_append_u32(req, IFLA_MACVLAN_MODE, netdev->macvlan_mode);
366 log_error_netdev(netdev,
367 "Could not append IFLA_MACVLAN_MODE attribute: %s",
373 r = sd_rtnl_message_close_container(req);
375 log_error_netdev(netdev,
376 "Could not close IFLA_INFO_DATA container %s",
381 r = sd_rtnl_message_close_container(req);
383 log_error_netdev(netdev,
384 "Could not close IFLA_LINKINFO container %s",
390 r = sd_rtnl_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
392 r = sd_rtnl_call_async(netdev->manager->rtnl, req, &netdev_create_handler, netdev, 0, NULL);
394 log_error_netdev(netdev,
395 "Could not send rtnetlink message: %s", strerror(-r));
399 log_debug_netdev(netdev, "creating netdev");
401 netdev->state = NETDEV_STATE_CREATING;
406 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
407 int netdev_enslave(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
410 switch(netdev->kind) {
411 case NETDEV_KIND_VLAN:
412 case NETDEV_KIND_MACVLAN:
413 return netdev_create(netdev, link, callback);
414 case NETDEV_KIND_VXLAN:
415 return netdev_create_vxlan(netdev, link, callback);
416 case NETDEV_KIND_IPIP:
417 case NETDEV_KIND_GRE:
418 case NETDEV_KIND_SIT:
419 case NETDEV_KIND_VTI:
420 return netdev_create_tunnel(netdev, link, callback);
425 if (netdev->state == NETDEV_STATE_READY) {
426 r = netdev_enslave_ready(netdev, link, callback);
430 /* the netdev is not yet read, save this request for when it is*/
431 netdev_enslave_callback *cb;
433 cb = new0(netdev_enslave_callback, 1);
437 cb->callback = callback;
440 LIST_PREPEND(callbacks, netdev->callbacks, cb);
446 int netdev_set_ifindex(NetDev *netdev, sd_rtnl_message *message) {
456 r = sd_rtnl_message_get_type(message, &type);
458 log_error_netdev(netdev, "Could not get rtnl message type");
462 if (type != RTM_NEWLINK) {
463 log_error_netdev(netdev, "Can not set ifindex from unexpected rtnl message type");
467 r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
469 log_error_netdev(netdev, "Could not get ifindex: %s", strerror(-r));
470 netdev_enter_failed(netdev);
472 } else if (ifindex <= 0) {
473 log_error_netdev(netdev, "Got invalid ifindex: %d", ifindex);
474 netdev_enter_failed(netdev);
478 if (netdev->ifindex > 0) {
479 if (netdev->ifindex != ifindex) {
480 log_error_netdev(netdev, "Could not set ifindex to %d, already set to %d",
481 ifindex, netdev->ifindex);
482 netdev_enter_failed(netdev);
485 /* ifindex already set to the same for this netdev */
489 r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &received_name);
491 log_error_netdev(netdev, "Could not get IFNAME");
495 if (!streq(netdev->ifname, received_name)) {
496 log_error_netdev(netdev, "Received newlink with wrong IFNAME %s",
498 netdev_enter_failed(netdev);
502 r = sd_rtnl_message_enter_container(message, IFLA_LINKINFO);
504 log_error_netdev(netdev, "Could not get LINKINFO");
508 r = sd_rtnl_message_read_string(message, IFLA_INFO_KIND, &received_kind);
510 log_error_netdev(netdev, "Could not get KIND");
514 r = sd_rtnl_message_exit_container(message);
516 log_error_netdev(netdev, "Could not exit container");
520 kind = netdev_kind_to_string(netdev->kind);
522 log_error_netdev(netdev, "Could not get kind");
523 netdev_enter_failed(netdev);
527 if (!streq(kind, received_kind)) {
528 log_error_netdev(netdev, "Received newlink with wrong KIND %s, "
529 "expected %s", received_kind, kind);
530 netdev_enter_failed(netdev);
534 netdev->ifindex = ifindex;
536 log_debug_netdev(netdev, "netdev has index %d", netdev->ifindex);
538 netdev_enter_ready(netdev);
543 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
545 static int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
546 _cleanup_free_ struct ether_addr *mac = NULL;
555 mac = new0(struct ether_addr, 1);
560 sz = sizeof(sd_id128_t) + l;
563 /* fetch some persistent data unique to the machine */
564 r = sd_id128_get_machine((sd_id128_t*) v);
568 /* combine with some data unique (on this machine) to this
570 memcpy(v + sizeof(sd_id128_t), ifname, l);
572 /* Let's hash the host machine ID plus the container name. We
573 * use a fixed, but originally randomly created hash key here. */
574 siphash24(result, v, sz, HASH_KEY.bytes);
576 assert_cc(ETH_ALEN <= sizeof(result));
577 memcpy(mac->ether_addr_octet, result, ETH_ALEN);
579 /* see eth_random_addr in the kernel */
580 mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
581 mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
589 static int netdev_load_one(Manager *manager, const char *filename) {
590 _cleanup_netdev_unref_ NetDev *netdev = NULL;
591 _cleanup_fclose_ FILE *file = NULL;
597 if (null_or_empty_path(filename)) {
598 log_debug("skipping empty file: %s", filename);
602 file = fopen(filename, "re");
610 netdev = new0(NetDev, 1);
615 netdev->manager = manager;
616 netdev->state = _NETDEV_STATE_INVALID;
617 netdev->kind = _NETDEV_KIND_INVALID;
618 netdev->macvlan_mode = _NETDEV_MACVLAN_MODE_INVALID;
619 netdev->vlanid = VLANID_MAX + 1;
620 netdev->vxlanid = VXLAN_VID_MAX + 1;
621 netdev->tunnel_pmtudisc = true;
622 netdev->learning = true;
624 r = config_parse(NULL, filename, file,
625 "Match\0NetDev\0VLAN\0MACVLAN\0VXLAN\0Tunnel\0Peer\0",
626 config_item_perf_lookup, (void*) network_netdev_gperf_lookup,
627 false, false, netdev);
629 log_warning("Could not parse config file %s: %s", filename, strerror(-r));
633 if (netdev->kind == _NETDEV_KIND_INVALID) {
634 log_warning("NetDev without Kind configured in %s. Ignoring", filename);
638 if (!netdev->ifname) {
639 log_warning("NetDev without Name configured in %s. Ignoring", filename);
643 if (netdev->kind == NETDEV_KIND_VLAN && netdev->vlanid > VLANID_MAX) {
644 log_warning("VLAN without valid Id configured in %s. Ignoring", filename);
648 if (netdev->kind == NETDEV_KIND_VXLAN && netdev->vxlanid > VXLAN_VID_MAX) {
649 log_warning("VXLAN without valid Id configured in %s. Ignoring", filename);
653 if (netdev->kind != NETDEV_KIND_VLAN && netdev->vlanid <= VLANID_MAX) {
654 log_warning("VLAN Id configured for a %s in %s. Ignoring",
655 netdev_kind_to_string(netdev->kind), filename);
659 if (netdev->kind != NETDEV_KIND_VXLAN && netdev->vxlanid <= VXLAN_VID_MAX) {
660 log_warning("VXLAN Id configured for a %s in %s. Ignoring",
661 netdev_kind_to_string(netdev->kind), filename);
665 if (netdev->kind != NETDEV_KIND_MACVLAN &&
666 netdev->macvlan_mode != _NETDEV_MACVLAN_MODE_INVALID) {
667 log_warning("MACVLAN Mode configured for a %s in %s. Ignoring",
668 netdev_kind_to_string(netdev->kind), filename);
672 netdev->filename = strdup(filename);
673 if (!netdev->filename)
676 if (net_match_config(NULL, NULL, NULL, NULL, NULL,
677 netdev->match_host, netdev->match_virt,
678 netdev->match_kernel, netdev->match_arch,
679 NULL, NULL, NULL, NULL, NULL, NULL) <= 0)
683 r = netdev_get_mac(netdev->ifname, &netdev->mac);
685 log_error("Failed to generate predictable MAC address for %s",
691 r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
695 LIST_HEAD_INIT(netdev->callbacks);
697 switch (netdev->kind) {
698 case NETDEV_KIND_VETH:
699 if (!netdev->ifname_peer) {
700 log_warning("Veth NetDev without peer name configured "
701 "in %s. Ignoring", filename);
706 r = netdev_get_mac(netdev->ifname_peer, &netdev->mac_peer);
708 log_error("Failed to generate predictable MAC address for %s",
709 netdev->ifname_peer);
714 r = netdev_create_veth(netdev, netdev_create_handler);
719 case NETDEV_KIND_BRIDGE:
720 case NETDEV_KIND_BOND:
721 r = netdev_create(netdev, NULL, NULL);
729 log_debug_netdev(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
736 int netdev_load(Manager *manager) {
743 while ((netdev = hashmap_first(manager->netdevs)))
744 netdev_unref(netdev);
746 r = conf_files_list_strv(&files, ".netdev", NULL, network_dirs);
748 log_error("Failed to enumerate netdev files: %s", strerror(-r));
752 STRV_FOREACH_BACKWARDS(f, files) {
753 r = netdev_load_one(manager, *f);